WorldWideScience

Sample records for remaining service life

  1. Method and apparatus to predict the remaining service life of an operating system

    Science.gov (United States)

    Greitzer, Frank L.; Kangas, Lars J.; Terrones, Kristine M.; Maynard, Melody A.; Pawlowski, Ronald A. , Ferryman; Thomas A.; Skorpik, James R.; Wilson, Bary W.

    2008-11-25

    A method and computer-based apparatus for monitoring the degradation of, predicting the remaining service life of, and/or planning maintenance for, an operating system are disclosed. Diagnostic information on degradation of the operating system is obtained through measurement of one or more performance characteristics by one or more sensors onboard and/or proximate the operating system. Though not required, it is preferred that the sensor data are validated to improve the accuracy and reliability of the service life predictions. The condition or degree of degradation of the operating system is presented to a user by way of one or more calculated, numeric degradation figures of merit that are trended against one or more independent variables using one or more mathematical techniques. Furthermore, more than one trendline and uncertainty interval may be generated for a given degradation figure of merit/independent variable data set. The trendline(s) and uncertainty interval(s) are subsequently compared to one or more degradation figure of merit thresholds to predict the remaining service life of the operating system. The present invention enables multiple mathematical approaches in determining which trendline(s) to use to provide the best estimate of the remaining service life.

  2. Prediction of pavement remaining service life based on repetition of load and permanent deformation

    Science.gov (United States)

    Usman, R. S.; Setyawan, A.; Suprapto, M.

    2018-03-01

    One of the methods which was applied in the assessment of flexible pavement performance was mechanistic method assuming structures of road pavement to become multi-layer structure for flexible pavement, that the vehicle load working on the pavement layer under repetition with power failure worth 1 (one) unit which was assumed as evenly distributed static load, and therefore the pavement material would provide response in the form of stress, strain, and deflection. This is closely related in order to assess the structure of flexible pavement and to predict the remaining service life on the roads of Pulau Indah sta 0 + 000 to sta. 0 + 845 in Kota Kupang, Nusa Tenggara Timur. The performance appraisal indicator which was used was fatigue cracking happening bottom of the asphalt layer and permanent deformation (rutting) on the surface of subgrade. The strain estimate on the flexible pavement layer structure needs carefulness and high accuracy and therefore a software like KENPAVE which produces horizontal tensile strain of 8,802E-05 and vertical compressive strain of 2,642E-04 was used. By applying equation of The Asphalt Instituteit was obtained repetition of permit load when reaching fatigue cracking (Nf) was 16.071.516 ESAL and permanent deformation (rutting) was 14.703.867 ESAL and also it was predicted the remaining service life of pavement applied the equation of AASTHO 1993 by considering Traffic Multiplier factor (TM 1.8, TM 1.9 and TM 2.0) obtained the remaining life service due to fatigue of 5.51% in the year of 13th (TM 1.8), 7.95% in the year of12th (TM 1.9) and 3.11% (TM 2.0) in the year of 12th, also the remaining service life due to rutting of 4.69% in the year of 12th(TM 1.8), 7.79% in the year of 11th (TM 1.9), and 2.94 in the year of 11th (TM 2.0).

  3. BTC method for evaluation of remaining strength and service life of bridge cables.

    Science.gov (United States)

    2011-09-01

    "This report presents the BTC method; a comprehensive state-of-the-art methodology for evaluation of remaining : strength and residual life of bridge cables. The BTC method is a probability-based, proprietary, patented, and peerreviewed : methodology...

  4. Decomposition Technique for Remaining Useful Life Prediction

    Science.gov (United States)

    Saha, Bhaskar (Inventor); Goebel, Kai F. (Inventor); Saxena, Abhinav (Inventor); Celaya, Jose R. (Inventor)

    2014-01-01

    The prognostic tool disclosed here decomposes the problem of estimating the remaining useful life (RUL) of a component or sub-system into two separate regression problems: the feature-to-damage mapping and the operational conditions-to-damage-rate mapping. These maps are initially generated in off-line mode. One or more regression algorithms are used to generate each of these maps from measurements (and features derived from these), operational conditions, and ground truth information. This decomposition technique allows for the explicit quantification and management of different sources of uncertainty present in the process. Next, the maps are used in an on-line mode where run-time data (sensor measurements and operational conditions) are used in conjunction with the maps generated in off-line mode to estimate both current damage state as well as future damage accumulation. Remaining life is computed by subtracting the instance when the extrapolated damage reaches the failure threshold from the instance when the prediction is made.

  5. Determination of Remaining Useful Life of Gas Turbine Blade

    Directory of Open Access Journals (Sweden)

    Meor Said Mior Azman

    2016-01-01

    Full Text Available The aim of this research is to determine the remaining useful life of gas turbine blade, using service-exposed turbine blades. This task is performed using Stress Rupture Test (SRT under accelerated test conditions where the applied stresses to the specimen is between 400 MPa to 600 MPa and the test temperature is 850°C. The study will focus on the creep behaviour of the 52000 hours service-exposed blades, complemented with creep-rupture modelling using JMatPro software and microstructure examination using optical microscope. The test specimens, made up of Ni-based superalloy of the first stage turbine blades, are machined based on International Standard (ISO 24. The results from the SRT will be analyzed using these two main equations – Larson-Miller Parameter and Life Fraction Rule. Based on the results of the remaining useful life analysis, the 52000h service-exposed blade has the condition to operate in the range of another 4751 hr to 18362 hr. The microstructure examinations shows traces of carbide precipitation that deteriorate the grain boundaries that occurs during creep process. Creep-rupture life modelling using JMatPro software has shown good agreement with the accelerated creep rupture test with minimal error.

  6. Status, remaining service-life and quality assurance of PP-materials in flue-gas applications; Status, kvarvarande livslaengd och kvalitetssaekring av PP-material i anlaeggningar foer rening och kondensering av roekgaser

    Energy Technology Data Exchange (ETDEWEB)

    Jacobson, Karin

    2011-10-15

    Background: The project is intended to provide a better understanding of how the service life of PP-materials is affected when used in flue-gas applications. It intends to form a basis for the development of relevant techniques and a methodology from which it is possible to give advice and guidance so that the quality of PP-materials can be ensured for a given desired service life. In addition it aims as being able to assess the status and remaining life of PP-materials in current components. Project outline - An inventory, contact and choice of facilities for closer cooperation. Plants with high proportions of PP in the equipment have been prioritised. - Visits to the chosen sites during shut-down periods for inspection and collection of samples from different PP details for further analysis in the laboratory. Collection of operating data and experiences of the use of PP (operating time/exposure conditions in different parts, component substitutions that have been made, etc.). - Systematic studies of the processes and mechanisms for stabiliser consumption over time. - Developing methods and methodology on which advice and guidance can be based so that the quality of PP-materials can be ensured for a given desired service life. The goal is to be able to assess the status and remaining service-life of the PP-materials in flue-gas applications. Results and Conclusions: It has been found that corrosion is relatively rare and that the main factors limiting the use and longevity of polypropylene are the thermal properties (thermal expansion and heat distortion). Leaching of stabilisers from the material is also commonly found but only a few cases of oxidative degradation, as a result of this, have been observed. An important part of the project has been to develop techniques and methodologies to assure the quality PP-material for a desired service life, and to assess the status and remaining life of the PP- materials in flue-gas applications. To do this, samples that

  7. Determination of the remaining operational life of power plant components

    International Nuclear Information System (INIS)

    Eiden, H.; Vorwerk, K.; Graeff, D.; Hoff, E.

    1983-01-01

    The proceedings volume presents, in full wording, eight papers read at a TUEV Rheinland meeting in Johannesburg, South Africa, in August 1982. Subjects: Layout, quality assurance, service life analysis etc. of power plant components. (RW) [de

  8. A Bayesian Framework for Remaining Useful Life Estimation

    Data.gov (United States)

    National Aeronautics and Space Administration — The estimation of remaining useful life (RUL) of a faulty component is at the center of system prognostics and health management. It gives operators a potent tool in...

  9. Remaining life assessment of a high pressure turbine rotor

    International Nuclear Information System (INIS)

    Nguyen, Ninh; Little, Alfie

    2012-01-01

    This paper describes finite element and fracture mechanics based modelling work that provides a useful tool for evaluation of the remaining life of a high pressure (HP) steam turbine rotor that had experienced thermal fatigue cracking. An axis-symmetrical model of a HP rotor was constructed. Steam temperature, pressure and rotor speed data from start ups and shut downs were used for the thermal and stress analysis. Operating history and inspection records were used to benchmark the damage experienced by the rotor. Fracture mechanics crack growth analysis was carried out to evaluate the remaining life of the rotor under themal cyclic loading conditions. The work confirmed that the fracture mechanics approach in conjunction with finite element modelling provides a useful tool for assessing the remaining life of high temperature components in power plants.

  10. Remaining childless : Causes and consequences from a life course perspective

    NARCIS (Netherlands)

    Keizer, R.

    2010-01-01

    Little is know about childless individuals in the Netherlands, although currently one out of every five Dutch individuals remains childless. Who are they? How did they end up being childless? How and to what extent are their life outcomes influenced by their childlessness? By focusing on individual

  11. Prognostic modelling options for remaining useful life estimation by industry

    Science.gov (United States)

    Sikorska, J. Z.; Hodkiewicz, M.; Ma, L.

    2011-07-01

    Over recent years a significant amount of research has been undertaken to develop prognostic models that can be used to predict the remaining useful life of engineering assets. Implementations by industry have only had limited success. By design, models are subject to specific assumptions and approximations, some of which are mathematical, while others relate to practical implementation issues such as the amount of data required to validate and verify a proposed model. Therefore, appropriate model selection for successful practical implementation requires not only a mathematical understanding of each model type, but also an appreciation of how a particular business intends to utilise a model and its outputs. This paper discusses business issues that need to be considered when selecting an appropriate modelling approach for trial. It also presents classification tables and process flow diagrams to assist industry and research personnel select appropriate prognostic models for predicting the remaining useful life of engineering assets within their specific business environment. The paper then explores the strengths and weaknesses of the main prognostics model classes to establish what makes them better suited to certain applications than to others and summarises how each have been applied to engineering prognostics. Consequently, this paper should provide a starting point for young researchers first considering options for remaining useful life prediction. The models described in this paper are Knowledge-based (expert and fuzzy), Life expectancy (stochastic and statistical), Artificial Neural Networks, and Physical models.

  12. NPP service life management

    International Nuclear Information System (INIS)

    Elagin, Yu.P.

    2001-01-01

    Problems of NPP service life management and service life prolongation are reviewed. Methods for the prolongation of the French NPP service life are discussed, priority directions of nuclear block service life management in regard to aging in the context of the European program of investigation into the materials aging are identified. Questions of the provision of the 60 years service life of the Mihama 1 block (Japan) and decision of the problem of the control equipment aging in Great Britain are discussed. Situation with the prolongation of licenses on the NPP operation in the USA and Spain is considered [ru

  13. USING CONDITION MONITORING TO PREDICT REMAINING LIFE OF ELECTRIC CABLES

    International Nuclear Information System (INIS)

    LOFARO, R.; SOO, P.; VILLARAN, M.; GROVE, E.

    2001-01-01

    Electric cables are passive components used extensively throughout nuclear power stations to perform numerous safety and non-safety functions. It is known that the polymers commonly used to insulate the conductors on these cables can degrade with time; the rate of degradation being dependent on the severity of the conditions in which the cables operate. Cables do not receive routine maintenance and, since it can be very costly, they are not replaced on a regular basis. Therefore, to ensure their continued functional performance, it would be beneficial if condition monitoring techniques could be used to estimate the remaining useful life of these components. A great deal of research has been performed on various condition monitoring techniques for use on electric cables. In a research program sponsored by the U.S. Nuclear Regulatory Commission, several promising techniques were evaluated and found to provide trendable information on the condition of low-voltage electric cables. These techniques may be useful for predicting remaining life if well defined limiting values for the aging properties being measured can be determined. However, each technique has advantages and limitations that must be addressed in order to use it effectively, and the necessary limiting values are not always easy to obtain. This paper discusses how condition monitoring measurements can be used to predict the remaining useful life of electric cables. The attributes of an appropriate condition monitoring technique are presented, and the process to be used in estimating the remaining useful life of a cable is discussed along with the difficulties that must be addressed

  14. Remaining useful life estimation based on discriminating shapelet extraction

    International Nuclear Information System (INIS)

    Malinowski, Simon; Chebel-Morello, Brigitte; Zerhouni, Noureddine

    2015-01-01

    In the Prognostics and Health Management domain, estimating the remaining useful life (RUL) of critical machinery is a challenging task. Various research topics including data acquisition, fusion, diagnostics and prognostics are involved in this domain. This paper presents an approach, based on shapelet extraction, to estimate the RUL of equipment. This approach extracts, in an offline step, discriminative rul-shapelets from an history of run-to-failure data. These rul-shapelets are patterns that are selected for their correlation with the remaining useful life of the equipment. In other words, every selected rul-shapelet conveys its own information about the RUL of the equipment. In an online step, these rul-shapelets are compared to testing units and the ones that match these units are used to estimate their RULs. Therefore, RUL estimation is based on patterns that have been selected for their high correlation with the RUL. This approach is different from classical similarity-based approaches that attempt to match complete testing units (or only late instants of testing units) with training ones to estimate the RUL. The performance of our approach is evaluated on a case study on the remaining useful life estimation of turbofan engines and performance is compared with other similarity-based approaches. - Highlights: • A data-driven RUL estimation technique based on pattern extraction is proposed. • Patterns are extracted for their correlation with the RUL. • The proposed method shows good performance compared to other techniques

  15. Remaining life diagnosis method and device for nuclear reactor

    International Nuclear Information System (INIS)

    Yamamoto, Michiyoshi.

    1996-01-01

    A neutron flux measuring means is inserted from the outside of a reactor pressure vessel during reactor operation to forecast neutron-degradation of materials of incore structural components in the vicinity of portions to be measured based on the measured values, and the remaining life of the reactor is diagnosed by the forecast degraded state. In this case, the neutron fluxes to be measured are desirably fast and/or medium neutron fluxes. As the positions where the measuring means is to be inserted, for example, the vicinity of the structural components at the periphery of the fuel assembly is selected. Aging degradation characteristics of the structural components are determined by using the aging degradation data for the structural materials. The remaining life is analyzed based on obtained aging degradation characteristics and stress evaluation data of the incore structural components at portions to be measured. Neutron irradiation amount of structural components at predetermined positions can be recognized accurately, and appropriate countermeasures can be taken depending on the forecast remaining life thereby enabling to improve the reliability of the reactor. (N.H.)

  16. Mineral remains of early life on Earth? On Mars?

    Science.gov (United States)

    Iberall, Robbins E.; Iberall, A.S.

    1991-01-01

    The oldest sedimentary rocks on Earth, the 3.8-Ga Isua Iron-Formation in southwestern Greenland, are metamorphosed past the point where organic-walled fossils would remain. Acid residues and thin sections of these rocks reveal ferric microstructures that have filamentous, hollow rod, and spherical shapes not characteristic of crystalline minerals. Instead, they resemble ferric-coated remains of bacteria. Because there are no earlier sedimentary rocks to study on Earth, it may be necessary to expand the search elsewhere in the solar system for clues to any biotic precursors or other types of early life. A study of morphologies of iron oxide minerals collected in the southern highlands during a Mars sample return mission may therefore help to fill in important gaps in the history of Earth's earliest biosphere. -from Authors

  17. Remaining life assessment and plant life extension in high temperature components of power and petrochemical plant

    International Nuclear Information System (INIS)

    Fleming, A.

    2003-01-01

    This paper explains the reasons why plant life can so easily be extended beyond the original design life. It details the means by which plant life extension is normally achieved, a structured plan for achieving such plant life extension at reasonable cost and some of the key techniques used in assessing the remaining life and discusses the simple repair options available. (author)

  18. Evaluation of remaining life of the double-shell tank waste systems

    International Nuclear Information System (INIS)

    Schwenk, E.B.

    1995-01-01

    A remaining life assessment of the DSTs (double-shell tanks) and their associated waste transfer lines, for continued operation over the next 10 years, was favorable. The DST assessment was based on definition of significant loads, evaluation of data for possible material degradation and geometric changes and evaluation of structural analyses. The piping assessment was based primarily on service experience

  19. Evaluation of remaining life of the double-shell tank waste systems

    Energy Technology Data Exchange (ETDEWEB)

    Schwenk, E.B.

    1995-05-04

    A remaining life assessment of the DSTs (double-shell tanks) and their associated waste transfer lines, for continued operation over the next 10 years, was favorable. The DST assessment was based on definition of significant loads, evaluation of data for possible material degradation and geometric changes and evaluation of structural analyses. The piping assessment was based primarily on service experience.

  20. Predicting the Remaining Useful Life of Rolling Element Bearings

    DEFF Research Database (Denmark)

    Hooghoudt, Jan Otto; Jantunen, E; Yi, Yang

    2018-01-01

    Condition monitoring of rolling element bearings is of vital importance in order to keep the industrial wheels running. In wind industry this is especially important due to the challenges in practical maintenance. The paper presents an attempt to improve the capability of prediction of remaining...

  1. Customer service: the key to remaining competitive in managed care.

    Science.gov (United States)

    Howard, J E

    2000-01-01

    The health care industry is undergoing a rapid transformation to meet the ever-increasing needs and demands of its patient population. Employers and managed care organizations are demanding better service and higher quality care, while providers are trying to tackle reimbursement cutbacks, streamlining of services, and serving a diverse population. Providers have begun to realize that to overcome these obstacles and meet the needs of their health plans and consumers, they must focus on the demands of their customers. Health care organizations have found they can meet the demands of both the consumer and the managed care industry through initiating and maintaining a customer service program. This essay explains the importance of customer service and its link to success in the managed care environment.

  2. Material aging and degradation detection and remaining life assessment for plant life management

    International Nuclear Information System (INIS)

    Ramuhalli, P.; Henager, C.H. Jr.; Griffin, J.W.; Meyer, R.M.; Coble, J.B.; Pitman, S.G.; Bond, L.J.

    2012-01-01

    One of the major factors that may impact long-term operations is structural material degradation. Detecting materials degradation, estimating the remaining useful life (RUL) of the component, and determining approaches to mitigating the degradation are important from the perspective of long-term operations. In this study, multiple nondestructive measurement and monitoring methods were evaluated for their ability to assess the material degradation state. Metrics quantifying the level of damage from these measurements were defined and evaluated for their ability to provide estimates of remaining life of the component. An example of estimating the RUL from nondestructive measurements of material degradation condition is provided. (author)

  3. Remaining life assessment of carbon steel boiler headers by repeated creep testing

    Energy Technology Data Exchange (ETDEWEB)

    Drew, M. [ANSTO, Materials and Engineering Science, New Illawarra Road, Lucas Heights, PMB 1 Menai, NSW 2234 (Australia)]. E-mail: michael.drew@ansto.gov.au; Humphries, S. [ANSTO, Materials and Engineering Science, New Illawarra Road, Lucas Heights, PMB 1 Menai, NSW 2234 (Australia); Thorogood, K. [ANSTO, Materials and Engineering Science, New Illawarra Road, Lucas Heights, PMB 1 Menai, NSW 2234 (Australia); Barnett, N. [BlueScope Steel, P.O. Box 1854, Wollongong, NSW (Australia)

    2006-05-15

    The condition of carbon steel boiler headers that have been in service for over 25 years has been assessed periodically by NDT, dimensional measurements, replication and accelerated creep testing. Historical temperature records were limited, so estimates of effective header temperatures were made from replicas. These estimates were compared with header stub thermocouple readings. At about 280,000 service hours, samples were chain-drilled from the headers for accelerated creep testing. These test results indicated that the headers had satisfactory remaining life. Nine years after the original samples were taken, additional samples were removed from one header at 337,000 service hours. The creep rupture properties measured from the repeated tests were almost identical to the initial results. A mild degree of random, nodular graphite was found in the samples and its effect on creep properties is discussed.

  4. Managing rail service life

    Directory of Open Access Journals (Sweden)

    Z. Popović

    2014-10-01

    Full Text Available The service life of rails depends especially on the operational loads and speeds on the railway lines, as well as on the rail maintenance policy. There are multiple aspects of rail maintenance optimization. The following article considers optimisation of rail maintenance activities relating to rail head surface condition in order to reduce corrective work on track geometry, as well as to minimize the overall costs for track maintenance. The objects of this research are issues and challenges related to rail and track maintenance in curves on modern conventional railway lines for mixed traffic.

  5. Data-driven remaining useful life prognosis techniques stochastic models, methods and applications

    CERN Document Server

    Si, Xiao-Sheng; Hu, Chang-Hua

    2017-01-01

    This book introduces data-driven remaining useful life prognosis techniques, and shows how to utilize the condition monitoring data to predict the remaining useful life of stochastic degrading systems and to schedule maintenance and logistics plans. It is also the first book that describes the basic data-driven remaining useful life prognosis theory systematically and in detail. The emphasis of the book is on the stochastic models, methods and applications employed in remaining useful life prognosis. It includes a wealth of degradation monitoring experiment data, practical prognosis methods for remaining useful life in various cases, and a series of applications incorporated into prognostic information in decision-making, such as maintenance-related decisions and ordering spare parts. It also highlights the latest advances in data-driven remaining useful life prognosis techniques, especially in the contexts of adaptive prognosis for linear stochastic degrading systems, nonlinear degradation modeling based pro...

  6. Screw Remaining Life Prediction Based on Quantum Genetic Algorithm and Support Vector Machine

    Directory of Open Access Journals (Sweden)

    Xiaochen Zhang

    2017-01-01

    Full Text Available To predict the remaining life of ball screw, a screw remaining life prediction method based on quantum genetic algorithm (QGA and support vector machine (SVM is proposed. A screw accelerated test bench is introduced. Accelerometers are installed to monitor the performance degradation of ball screw. Combined with wavelet packet decomposition and isometric mapping (Isomap, the sensitive feature vectors are obtained and stored in database. Meanwhile, the sensitive feature vectors are randomly chosen from the database and constitute training samples and testing samples. Then the optimal kernel function parameter and penalty factor of SVM are searched with the method of QGA. Finally, the training samples are used to train optimized SVM while testing samples are adopted to test the prediction accuracy of the trained SVM so the screw remaining life prediction model can be got. The experiment results show that the screw remaining life prediction model could effectively predict screw remaining life.

  7. Estimation the remaining service-lifetime of wooden structure of geothermal cooling tower

    Directory of Open Access Journals (Sweden)

    Effendi Tri Bahtiar

    2017-06-01

    Full Text Available Similar with other construction materials, wood strength is decreasing when applied by long term loading. Wooden cooling tower structure at Star Energy Geothermal (Wayang Windu Ltd was built in 1998 and it should be evaluated to avoid sudden structural failure. Evaluation conducted through several steps: wood species identification, the physical and mechanical properties testing, and estimation for remaining service-lifetime by generating mathematical models derived from creep test and reduction of cross sectional area of the wood. Identification result that the wood are redwood (Sequoia sempervirens and Douglas fir (Pseudotsuga menziesii. The wood density value has degraded from the surface until 0.25 cm depth. Strength characteristics of the wood have considerably decreased, but the allowable stress for bending, tension parallel to grain, and shear were still higher than NDS2005 requirements. The allowable stress for compression parallel to grain was slightly lower than NDS, while compression perpendicular to grain was much lower. Average modulus of elasticity reduces become lower than the value stated by the code, but the minimum value of modulus of elasticity (Emin of redwood was still higher than the code value, while Emin of Douglas fir is slightly lower. Then, in accordance with those findings, the construction would not failure yet but the deformation and vibration will occur in higher rate than design planning. This research develops mathematical models for estimating the remaining service-lifetime of the wooden cooling tower structure in geothermal power plant based on the wood performance in resisting long term loading and its deterioration rate. The deterioration rate of wood member of cooling tower structure at Star Energy Geothermal (Wayang Windu Ltd is 0.0147 cm depth per year, so equation for the residual service life estimation is σlaterσtoday=bh2(b−0.0147T(h−0.0147T2, and σlater must be lower than allowable stress.

  8. Child life services.

    Science.gov (United States)

    Wilson, Jerriann M

    2006-10-01

    Child life programs have become standard in most large pediatric centers and even on some smaller pediatric inpatient units to address the psychosocial concerns that accompany hospitalization and other health care experiences. The child life specialist focuses on the strengths and sense of well-being of children while promoting their optimal development and minimizing the adverse effects of children's experiences in health care or other potentially stressful settings. Using play and psychological preparation as primary tools, child life interventions facilitate coping and adjustment at times and under circumstances that might prove overwhelming otherwise. Play and age-appropriate communication may be used to (1) promote optimal development, (2) present information, (3) plan and rehearse useful coping strategies for medical events or procedures, (4) work through feelings about past or impending experiences, and (5) establish therapeutic relationships with children and parents to support family involvement in each child's care, with continuity across the care continuum. The benefits of this collaborative work with the family and health care team are not limited to the health care setting; it may also optimize reintegration into schools and the community.

  9. Optimization of Aeroengine Shop Visit Decisions Based on Remaining Useful Life and Stochastic Repair Time

    Directory of Open Access Journals (Sweden)

    Jing Cai

    2016-01-01

    Full Text Available Considering the wide application of condition-based maintenance in aeroengine maintenance practice, it becomes possible for aeroengines to carry out their preventive maintenance in just-in-time (JIT manner by reasonably planning their shop visits (SVs. In this study, an approach is proposed to make aeroengine SV decisions following the concept of JIT. Firstly, a state space model (SSM for aeroengine based on exhaust gas temperature margin is developed to predict the remaining useful life (RUL of aeroengine. Secondly, the effect of SV decisions on risk and service level (SL is analyzed, and an optimization of the aeroengine SV decisions based on RUL and stochastic repair time is performed to carry out JIT manner with the requirement of safety and SL. Finally, a case study considering two CFM-56 aeroengines is presented to demonstrate the proposed approach. The results show that predictive accuracy of RUL with SSM is higher than with linear regression, and the process of SV decisions is simple and feasible for airlines to improve the inventory management level of their aeroengines.

  10. Method for estimating capacity and predicting remaining useful life of lithium-ion battery

    International Nuclear Information System (INIS)

    Hu, Chao; Jain, Gaurav; Tamirisa, Prabhakar; Gorka, Tom

    2014-01-01

    Highlights: • We develop an integrated method for the capacity estimation and RUL prediction. • A state projection scheme is derived for capacity estimation. • The Gauss–Hermite particle filter technique is used for the RUL prediction. • Results with 10 years’ continuous cycling data verify the effectiveness of the method. - Abstract: Reliability of lithium-ion (Li-ion) rechargeable batteries used in implantable medical devices has been recognized as of high importance from a broad range of stakeholders, including medical device manufacturers, regulatory agencies, physicians, and patients. To ensure Li-ion batteries in these devices operate reliably, it is important to be able to assess the capacity of Li-ion battery and predict the remaining useful life (RUL) throughout the whole life-time. This paper presents an integrated method for the capacity estimation and RUL prediction of Li-ion battery used in implantable medical devices. A state projection scheme from the author’s previous study is used for the capacity estimation. Then, based on the capacity estimates, the Gauss–Hermite particle filter technique is used to project the capacity fade to the end-of-service (EOS) value (or the failure limit) for the RUL prediction. Results of 10 years’ continuous cycling test on Li-ion prismatic cells in the lab suggest that the proposed method achieves good accuracy in the capacity estimation and captures the uncertainty in the RUL prediction. Post-explant weekly cycling data obtained from field cells with 4–7 implant years further verify the effectiveness of the proposed method in the capacity estimation

  11. Remaining useful life prediction of degrading systems subjected to imperfect maintenance: Application to draught fans

    Science.gov (United States)

    Wang, Zhao-Qiang; Hu, Chang-Hua; Si, Xiao-Sheng; Zio, Enrico

    2018-02-01

    Current degradation modeling and remaining useful life prediction studies share a common assumption that the degrading systems are not maintained or maintained perfectly (i.e., to an as-good-as new state). This paper concerns the issues of how to model the degradation process and predict the remaining useful life of degrading systems subjected to imperfect maintenance activities, which can restore the health condition of a degrading system to any degradation level between as-good-as new and as-bad-as old. Toward this end, a nonlinear model driven by Wiener process is first proposed to characterize the degradation trajectory of the degrading system subjected to imperfect maintenance, where negative jumps are incorporated to quantify the influence of imperfect maintenance activities on the system's degradation. Then, the probability density function of the remaining useful life is derived analytically by a space-scale transformation, i.e., transforming the constructed degradation model with negative jumps crossing a constant threshold level to a Wiener process model crossing a random threshold level. To implement the proposed method, unknown parameters in the degradation model are estimated by the maximum likelihood estimation method. Finally, the proposed degradation modeling and remaining useful life prediction method are applied to a practical case of draught fans belonging to a kind of mechanical systems from steel mills. The results reveal that, for a degrading system subjected to imperfect maintenance, our proposed method can obtain more accurate remaining useful life predictions than those of the benchmark model in literature.

  12. Remaining Life Estimation Of Secondary Superheater Outlet On Industrial Electrical Boiler

    International Nuclear Information System (INIS)

    Soedardjo; Andryansyah; Arhatari, B.D.; Natsir, Muhammad; Triyadi, Ari; Farokhi

    2001-01-01

    Remaining life estimation of secondary superheater header outlet (SSHO) on industrial electrical boiler has been carried out. Estimation conducted by the observation of microstructure cavitation development based on Neubauer and Wedel theory. The result is available for isolated cavitation development present yet. That Secondary Superheater Outlet component is in good condition after 14 years operated and predicted could be operated for 36 years again

  13. The privacy concerns in location based services: protection approaches and remaining challenges

    OpenAIRE

    Basiri, Anahid; Moore, Terry; Hill, Chris

    2016-01-01

    Despite the growth in the developments of the Location Based Services (LBS) applications, there are still several challenges remaining. One of the most important concerns about LBS, shared by many users and service providers is the privacy. Privacy has been considered as a big threat to the adoption of LBS among many users and consequently to the growth of LBS markets. This paper discusses the privacy concerns associated with location data, and the current privacy protection approaches. It re...

  14. Fitness-for-service and defect tolerance assessment - solutions for cracked components to remain in service

    International Nuclear Information System (INIS)

    Nguyen, Ninh; De Beer, Eric

    2013-01-01

    This paper describes the application of the FFS/DTA methodology to assist plant asset managers in dealing with cracks that have been detected in in-service components, particularly those in the power, petrochemical, mining and transport industries. Several state-of-the-art structural integrity assessment proce-dures such as AS/NZS 3788, BS7910, R5-R6 and API-579-1/ ASME FFS-1 are described and discussed; and their application to practical situations using the principles of FFS/DTA is illustrated through a series of selected case studies. The usefulness, effectiveness and versatility of this fracture-mechanics based methodology for examination of in-service cracked components is amply demonstrated.

  15. Modelling of volunteer satisfaction and intention to remain in community service: A stepwise approach

    Science.gov (United States)

    Hasan, Hazlin; Wahid, Sharifah Norhuda Syed; Jais, Mohammad; Ridzuan, Arifi

    2017-05-01

    The purpose of this study is to obtain the most significant model of volunteer satisfaction and intention to remain in community service by using a stepwise approach. Currently, Malaysians, young and old are showing more interests in involving themselves in community service projects, either locally or internationally. This positive movement of serving the needy is somehow being halted by the lack of human and financial resources. Therefore, the trend today sees organizers of such projects depend heavily on voluntary supports as they enable project managers to add and to expand the quantity and diversity of services offered without exhausting the minimal budget available. Volunteers are considered a valuable commodity as the available pool of volunteers may be declining due to various reasons which include the volunteer satisfaction. In tandem with the existing situation, a selected sample of 215 diploma students from one of the public universities in Malaysia, who have been involved in at least one community service project, agreed that everybody should have a volunteering intention in helping others. The findings revealed that the most significant model obtained contains two factors that contributed towards intention to remain in community service; work assignment and organizational support, with work assignment becoming the most significant factor. Further research on the differences of intention to remain in community service between students' stream and gender would be conducted to contribute to the body of knowledge.

  16. Use of NDE and FM for the assessment of remaining life of steam turbines

    Energy Technology Data Exchange (ETDEWEB)

    Alley, T [Duke Power Co., Charlotte, NC (United States); Stone, R [Electric Power Research Inst., Charlotte, NC (United States). Nondestructive Evaluation Center

    1988-12-31

    Catastrophic failures of rotating turbine components, such as the Gallatin rotor burst in 1974 and the shrunk-on disk rupture at Hinkley Point in 1969, alerted the utility industry to the failure potential of these components. Such failures can cause severe financial loss; endanger personnel; and, in nuclear plants, damage safety related equipment. To adequately predict the remaining life of a turbine rotor requires accurate information about component flaws, material properties, future operating loads, relevant failure mechanisms, and an approach to combine this information to make an assessment of remaining life. EPRI has supported the development of improved ultrasonic test equipment for use from the rotor bore (bore-sonic examination) and a fracture mechanics based life assessment code called SAFER (Stress and Fracture Evaluation of Rotors). The EPRI NDE Center has supported the transfer of this technology to industry. This presentation deals with the NDE Center`s transfer of the NDE and life assessment technology to industry and discusses a particular application by Duke Power Company at their Allen Plant, Unit 1 to extend the operating life of an IP/LP turbine. (author).

  17. Use of NDE and FM for the assessment of remaining life of steam turbines

    International Nuclear Information System (INIS)

    Alley, T.; Stone, R.

    1988-01-01

    Catastrophic failures of rotating turbine components, such as the Gallatin rotor burst in 1974 and the shrunk-on disk rupture at Hinkley Point in 1969, alerted the utility industry to the failure potential of these components. Such failures can cause severe financial loss; endanger personnel; and, in nuclear plants, damage safety related equipment. To adequately predict the remaining life of a turbine rotor requires accurate information about component flaws, material properties, future operating loads, relevant failure mechanisms, and an approach to combine this information to make an assessment of remaining life. EPRI has supported the development of improved ultrasonic test equipment for use from the rotor bore (bore-sonic examination) and a fracture mechanics based life assessment code called SAFER (Stress and Fracture Evaluation of Rotors). The EPRI NDE Center has supported the transfer of this technology to industry. This presentation deals with the NDE Center's transfer of the NDE and life assessment technology to industry and discusses a particular application by Duke Power Company at their Allen Plant, Unit 1 to extend the operating life of an IP/LP turbine. (author)

  18. The Remaining Service Time Upon Reaching a High Level in M/G/1 Queues

    NARCIS (Netherlands)

    de Boer, Pieter-Tjerk; Nicola, V.F.; van Ommeren, Jan C.W.

    The distribution of the remaining service time upon reaching some target level in an M/G/1 queue is of theoretical as well as practical interest. In general, this distribution depends on the initial level as well as on the target level, say, B. Two initial levels are of particular interest, namely,

  19. Risk-based management of remaining life of power plant components

    International Nuclear Information System (INIS)

    Roos, E.; Jovanovic, A.S.; Maile, K.; Auerkari, P.

    1999-01-01

    The paper describes application of different modules of the MPA-System ALIAS in risk-based management of remaining life of power plant components. The system allows comprehensive coverage of all aspects of the remaining life management, including also the risk analysis and risk management. In addition, thanks to the modular character of the system it is also possible to implement new methods: In the case described here, a new (probabilistic) method for determination of the next inspection time for the components exposed to creep loading has been developed and implemented in the system. Practical application of the method has shown (a) that the mean values obtained by the method fall into the range of results obtained by other methods (based on expert knowledge), and (b) that it is possible to quantify the probability of aberration from the mean values. This in turn allows quantifying the additional risks linked to e.g. prolonging of inspection intervals. (orig.) [de

  20. Remaining useful life assessment of lithium-ion batteries in implantable medical devices

    Science.gov (United States)

    Hu, Chao; Ye, Hui; Jain, Gaurav; Schmidt, Craig

    2018-01-01

    This paper presents a prognostic study on lithium-ion batteries in implantable medical devices, in which a hybrid data-driven/model-based method is employed for remaining useful life assessment. The method is developed on and evaluated against data from two sets of lithium-ion prismatic cells used in implantable applications exhibiting distinct fade performance: 1) eight cells from Medtronic, PLC whose rates of capacity fade appear to be stable and gradually decrease over a 10-year test duration; and 2) eight cells from Manufacturer X whose rates appear to be greater and show sharp increase after some period over a 1.8-year test duration. The hybrid method enables online prediction of remaining useful life for predictive maintenance/control. It consists of two modules: 1) a sparse Bayesian learning module (data-driven) for inferring capacity from charge-related features; and 2) a recursive Bayesian filtering module (model-based) for updating empirical capacity fade models and predicting remaining useful life. A generic particle filter is adopted to implement recursive Bayesian filtering for the cells from the first set, whose capacity fade behavior can be represented by a single fade model; a multiple model particle filter with fixed-lag smoothing is proposed for the cells from the second data set, whose capacity fade behavior switches between multiple fade models.

  1. Assessment of lumen degradation and remaining useful life of LEDs using particle filter

    Energy Technology Data Exchange (ETDEWEB)

    Lall, Pradeep [Auburn Univ., AL (United States); Zhang, Hao [Auburn Univ., AL (United States); Davis, Lynn [Auburn Univ., AL (United States)

    2013-07-16

    With the development of light-emitting diode (LED) technology, light emitting diodes system is becoming a popular light source in daily life and industry area. It has shown that Led from same factory and work under same working condition, may have significantly different behavior. Therefore, it is very important to learn the fail mechanisms, especially in the case of safety critical and harsh environment application. This paper focus on a prognostic health management (PHM) method based on the measurement of forward voltage and forward current of bare LED under harsh environment. In this paper, experiment has been done with ten samples. Ten pristine bare LEDs have been tested at 85°C while simultaneously being subjected to 85% humid environment. Pulse width modulation (PWM) control method has been employed to drive the bare LED in order to reduce the heat effect caused by forward current and high frequency (300HZ) data acquisition has been used to measure the peak forward voltage and forward current. Test to failure (lumen drops to 70 percent) data has been measured to study the effects of high temperature and humid environment loadings on the bare LED. Also, solid state cooling method with peltier cooler has been used to control the temperature of LED in the integrating sphere when take the measurement of lumen flux. The shift of forward voltage forward current curve and lumen degradation has been recorded to help build the fail model and predicted the remaining useful life. In this method, particle filter has been employed to predict the remaining useful life (RUL) of the bare LED and give us a whole picture how Led system fails. Result shows that predication of remaining useful life of Led, made by the particle filter model works under reasonable limit, and hence this method can be employed to predict the failure of Led caused by thermal and humid stress under harsh environment.

  2. Guarantee of remaining life time. Integrity of mechanical components and control of ageing phenomena

    International Nuclear Information System (INIS)

    Schuler, X.; Herter, K.H.; Koenig, G.

    2012-01-01

    The life time of safety relevant systems, structures and components (SSC) of Nuclear Power Plants (NPP) is determined by two main principles. First of all the required quality has to be produced during the design and fabrication process. This means that quality has to be produced and can't be improved by excessive inspections (Basis Safety - quality through production principle). The second one is assigned to the initial quality which has to be maintained during operation. This concerns safe operation during the total life time (life time management), safety against ageing phenomena (AM - ageing management) as well as proof of integrity (e.g. break preclusion or avoidance of fracture for SSC with high safety relevance). Initiated by the Fukushima Dai-ichi event in Japan in spring 2011 for German NPP's Long Term Operation (LTO) is out of question. In June 2011 legislation took decision to phase-out from nuclear by 2022. As a fact safe operation shall be guaranteed for the remaining life time. Within this technical framework the ageing management is a key element. Depending on the safety-relevance of the SSC under observation including preventive maintenance various tasks are required in particular to clarify the mechanisms which contribute systemspecifically to the damage of the components and systems and to define their controlling parameters which have to be monitored and checked. Appropriate continuous or discontinuous measures are to be considered in this connection. The approach to ensure a high standard of quality in operation for the remaining life time and the management of the technical and organizational aspects are demonstrated and explained. The basis for ageing management to be applied to NNPs is included in Nuclear Safety Standard 1403 which describes the ageing management procedures. For SSC with high safety relevance a verification analysis for rupture preclusion (proof of integrity, integrity concept) shall be performed (Nuclear Safety Standard 3206

  3. Assessment of the Remaining Life of Bituminous Layers in Road Pavements

    Directory of Open Access Journals (Sweden)

    Kálmán Adorjányi

    2017-02-01

    Full Text Available In this paper, a mechanistic-empirical approach is presented for the assessment of bearing capacity condition of asphalt pavement layers by Falling Weight Deflectometer measurements and laboratory fatigue tests. The bearing capacity condition ratio was determined using past traffic data and the remaining fatigue life which was determined from multilayer pavement response model. The traffic growth rate was taken into account with finite arithmetic and geometric progressions. Fatigue resistance of layers’ bituminous materials was obtained with indirect tensile fatigue tests. Deduct curve of condition scores was derived with Weibull distribution.

  4. An adaptive-order particle filter for remaining useful life prediction of aviation piston pumps

    Directory of Open Access Journals (Sweden)

    Tongyang LI

    2018-05-01

    Full Text Available An accurate estimation of the remaining useful life (RUL not only contributes to an effective application of an aviation piston pump, but also meets the necessity of condition based maintenance (CBM. For the current RUL evaluation methods, a model-based method is inappropriate for the degradation process of an aviation piston pump due to difficulties of modeling, while a data-based method rarely presents high-accuracy prediction in a long period of time. In this work, an adaptive-order particle filter (AOPF prognostic process is proposed aiming at improving long-term prediction accuracy of RUL by combining both kinds of methods. A dynamic model is initialized by a data-driven or empirical method. When a new observation comes, the prior state distribution is approximated by a current model. The order of the current model is updated adaptively by fusing the information of the observation. Monte Carlo simulation is employed for estimating the posterior probability density function of future states of the pump’s degradation. With updating the order number adaptively, the method presents a higher precision in contrast with those of traditional methods. In a case study, the proposed AOPF method is adopted to forecast the degradation status of an aviation piston pump with experimental return oil flow data, and the analytical results show the effectiveness of the proposed AOPF method. Keywords: Adaptive prognosis, Condition based maintenance (CBM, Particle filter (PF, Piston pump, Remaining useful life (RUL

  5. Satellite Lithium-Ion Battery Remaining Cycle Life Prediction with Novel Indirect Health Indicator Extraction

    Directory of Open Access Journals (Sweden)

    Haitao Liao

    2013-07-01

    Full Text Available Prognostics and remaining useful life (RUL estimation for lithium-ion batteries play an important role in intelligent battery management systems (BMS. The capacity is often used as the fade indicator for estimating the remaining cycle life of a lithium-ion battery. For spacecraft requiring high reliability and long lifetime, in-orbit RUL estimation and reliability verification on ground should be carefully addressed. However, it is quite challenging to monitor and estimate the capacity of a lithium-ion battery on-line in satellite applications. In this work, a novel health indicator (HI is extracted from the operating parameters of a lithium-ion battery to quantify battery degradation. Moreover, the Grey Correlation Analysis (GCA is utilized to evaluate the similarities between the extracted HI and the battery’s capacity. The result illustrates the effectiveness of using this new HI for fading indication. Furthermore, we propose an optimized ensemble monotonic echo state networks (En_MONESN algorithm, in which the monotonic constraint is introduced to improve the adaptivity of degradation trend estimation, and ensemble learning is integrated to achieve high stability and precision of RUL prediction. Experiments with actual testing data show the efficiency of our proposed method in RUL estimation and degradation modeling for the satellite lithium-ion battery application.

  6. A naive Bayes model for robust remaining useful life prediction of lithium-ion battery

    International Nuclear Information System (INIS)

    Ng, Selina S.Y.; Xing, Yinjiao; Tsui, Kwok L.

    2014-01-01

    Highlights: • Robustness of RUL predictions for lithium-ion batteries is analyzed quantitatively. • RUL predictions of the same battery over cycle life are evaluated. • RUL predictions of batteries over different operating conditions are evaluated. • Naive Bayes (NB) is proposed for predictions under constant discharge environments. • Its robustness and accuracy are compared with that of support vector machine (SVM). - Abstract: Online state-of-health (SoH) estimation and remaining useful life (RUL) prediction is a critical problem in battery health management. This paper studies the modeling of battery degradation under different usage conditions and ambient temperatures, which is seldom considered in the literature. Li-ion battery RUL prediction under constant operating conditions at different values of ambient temperature and discharge current are considered. A naive Bayes (NB) model is proposed for RUL prediction of batteries under different operating conditions. It is shown in this analysis that under constant discharge environments, the RUL of Li-ion batteries can be predicted with the NB method, irrespective of the exact values of the operating conditions. The case study shows that the NB generates stable and competitive prediction performance over that of the support vector machine (SVM). This also suggests that, while it is well known that the environmental conditions have big impact on the degradation trend, it is the changes in operating conditions of a Li-ion battery over cycle life that makes the Li-ion battery degradation and RUL prediction even more difficult

  7. Remaining life prediction of I and C cables for reliability assessment of NPP systems

    International Nuclear Information System (INIS)

    Santhosh, T.V.; Ghosh, A.K.; Fernandes, B.G.

    2012-01-01

    Highlights: ► A framework for time dependent reliability prediction of I and C cables for use in PSA of NPP has been developed using stress–strength interference theory. ► The proposed methodology has been illustrated with the accelerated thermal aging data on a typical XLPE cable. ► The behavior of insulation resistance when the degradation process is linear or exponential has also been modeled. ► The reliability index or probability of failure obtained from this approach can be used in system reliability evaluation to account for cable aging for PSA of NPP. - Abstract: Instrumentation and control (I and C) cables are one of the most important components in nuclear power plants (NPPs) because they provide power to safety-related equipment and also to transmit signals to and from various controllers to perform safety operations. I and C cables in NPP are subjected to a variety of aging and degradation stressors that can produce immediate degradation or aging-related mechanisms causing the degradation of cable components over time. Although, there exits several life estimation techniques, currently there is no any standard methodology or an approach toward estimating the time dependent reliability of I and C cables that can be directly used in probabilistic safety assessment (PSA) applications. Hence, the objective of this study is to develop an approach to estimate and confirm the continued acceptable margin in cable insulation life over time subjected to aging. This paper presents a framework based on the structural reliability theory to quantify the life time of I and C cable subjecting to thermal aging. Since cross-linked polyethylene (XLPE) cables are extensively being used in Indian NPPs, the remaining life time evaluations have been carried out for a typical XLPE cable. However, the methodology can be extended to other cables such as polyvinyl chloride (PVC), ethylene propylene rubber (EPR), etc.

  8. Effect of interaction of embedded crack and free surface on remaining fatigue life

    Directory of Open Access Journals (Sweden)

    Genshichiro Katsumata

    2016-12-01

    Full Text Available Embedded crack located near free surface of a component interacts with the free surface. When the distance between the free surface and the embedded crack is short, stress at the crack tip ligament is higher than that at the other area of the cracked section. It can be easily expected that fatigue crack growth is fast, when the embedded crack locates near the free surface. To avoid catastrophic failures caused by fast fatigue crack growth at the crack tip ligament, fitness-for-service (FFS codes provide crack-to-surface proximity rules. The proximity rules are used to determine whether the cracks should be treated as embedded cracks as-is, or transformed to surface cracks. Although the concepts of the proximity rules are the same, the specific criteria and the rules to transform embedded cracks into surface cracks differ amongst FFS codes. This paper focuses on the interaction between an embedded crack and a free surface of a component as well as on its effects on the remaining fatigue lives of embedded cracks using the proximity rules provided by the FFS codes. It is shown that the remaining fatigue lives for the embedded cracks strongly depend on the crack aspect ratio and location from the component free surface. In addition, it can be said that the proximity criteria defined by the API and RSE-M codes give overly conservative remaining lives. On the contrary, the WES and AME codes always give long remaining lives and non-conservative estimations. When the crack aspect ratio is small, ASME code gives non-conservative estimation.

  9. Intelligent Prognostic Framework for Degradation Assessment and Remaining Useful Life Estimation of Photovoltaic Module

    Directory of Open Access Journals (Sweden)

    Nabil Laayouj

    2016-12-01

    Full Text Available All industrial systems and machines are subjected to degradation processes, which can be related to the operating conditions. This degradation can cause unwanted stops at any time and major maintenance work sometimes. The accurate prediction of the remaining useful life (RUL is an important challenge in condition-based maintenance. Prognostic activity allows estimating the RUL before failure occurs and triggering actions to mitigate faults in time when needed. In this study, a new smart prognostic method for photovoltaic module health degradation was developed based on two approaches to achieve more accurate predictions: online diagnosis and data-driven prognosis. This framework of forecasting integrates the strengths of real-time monitoring in the first approach and relevant vector machine in the second. The results show that the proposed method is plausible due to its good prediction of RUL and can be effectively applied to many systems for monitoring and prognostics.

  10. Remaining Useful Life Prediction of Gas Turbine Engine using Autoregressive Model

    Directory of Open Access Journals (Sweden)

    Ahsan Shazaib

    2017-01-01

    Full Text Available Gas turbine (GT engines are known for their high availability and reliability and are extensively used for power generation, marine and aero-applications. Maintenance of such complex machines should be done proactively to reduce cost and sustain high availability of the GT. The aim of this paper is to explore the use of autoregressive (AR models to predict remaining useful life (RUL of a GT engine. The Turbofan Engine data from NASA benchmark data repository is used as case study. The parametric investigation is performed to check on any effect of changing model parameter on modelling accuracy. Results shows that a single sensory data cannot accurately predict RUL of GT and further research need to be carried out by incorporating multi-sensory data. Furthermore, the predictions made using AR model seems to give highly pessimistic values for RUL of GT.

  11. Lithium-ion Battery Degradation Assessment and Remaining Useful Life Estimation in Hybrid Electric Vehicle

    Directory of Open Access Journals (Sweden)

    Nabil Laayouj

    2016-06-01

    Full Text Available Abstract—Prognostic activity deals with prediction of the remaining useful life (RUL of physical systems based on their actual health state and their usage conditions. RUL estimation gives operators a potent tool in decision making by quantifying how much time is left until functionality is lost. In addition, it can be used to improve the characterization of the material proprieties that govern damage propagation for the structure being monitored. RUL can be estimated by using three main approaches, namely model-based, data-driven and hybrid approaches. The prognostics methods used later in this paper are hybrid and data-driven approaches, which employ the Particle Filter in the first one and the autoregressive integrated moving average in the second. The performance of the suggested approaches is evaluated in a comparative study on data collected from lithium-ion battery of hybrid electric vehicle.

  12. Remaining useful life estimation in heterogeneous fleets working under variable operating conditions

    International Nuclear Information System (INIS)

    Al-Dahidi, Sameer; Di Maio, Francesco; Baraldi, Piero; Zio, Enrico

    2016-01-01

    The availability of condition monitoring data for large fleets of similar equipment motivates the development of data-driven prognostic approaches that capitalize on the information contained in such data to estimate equipment Remaining Useful Life (RUL). A main difficulty is that the fleet of equipment typically experiences different operating conditions, which influence both the condition monitoring data and the degradation processes that physically determine the RUL. We propose an approach for RUL estimation from heterogeneous fleet data based on three phases: firstly, the degradation levels (states) of an homogeneous discrete-time finite-state semi-markov model are identified by resorting to an unsupervised ensemble clustering approach. Then, the parameters of the discrete Weibull distributions describing the transitions among the states and their uncertainties are inferred by resorting to the Maximum Likelihood Estimation (MLE) method and to the Fisher Information Matrix (FIM), respectively. Finally, the inferred degradation model is used to estimate the RUL of fleet equipment by direct Monte Carlo (MC) simulation. The proposed approach is applied to two case studies regarding heterogeneous fleets of aluminium electrolytic capacitors and turbofan engines. Results show the effectiveness of the proposed approach in predicting the RUL and its superiority compared to a fuzzy similarity-based approach of literature. - Highlights: • The prediction of the remaining useful life for heterogeneous fleets is addressed. • A data-driven prognostics approach based on a Markov model is proposed. • The proposed approach is applied to two different heterogeneous fleets. • The results are compared with those obtained by a fuzzy similarity-based approach.

  13. Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants – Interim Study FY13

    Energy Technology Data Exchange (ETDEWEB)

    Simmons, Kevin L.; Fifield, Leonard S.; Westman, Matthew P.; Ramuhalli, Pradeep; Pardini, Allan F.; Tedeschi, Jonathan R.; Jones, Anthony M.

    2013-09-27

    The most important criterion for cable performance is its ability to withstand a design-basis accident. With nearly 1000 km of power, control, instrumentation, and other cables typically found in an NPP, it would be a significant undertaking to inspect all of the cables. Degradation of the cable jacket, electrical insulation, and other cable components is a key issue that is likely to affect the ability of the currently installed cables to operate safely and reliably for another 20 to 40 years beyond the initial operating life. The development of one or more nondestructive evaluation (NDE) techniques and supporting models that could assist in determining the remaining life expectancy of cables or their current degradation state would be of significant interest. The ability to nondestructively determine material and electrical properties of cable jackets and insulation without disturbing the cables or connections has been deemed essential. Currently, the only technique accepted by industry to measure cable elasticity (the gold standard for determining cable insulation degradation) is the indentation measurement. All other NDE techniques are used to find flaws in the cable and do not provide information to determine the current health or life expectancy. There is no single NDE technique that can satisfy all of the requirements needed for making a life-expectancy determination, but a wide range of methods have been evaluated for use in NPPs as part of a continuous evaluation program. The commonly used methods are indentation and visual inspection, but these are only suitable for easily accessible cables. Several NDE methodologies using electrical techniques are in use today for flaw detection but there are none that can predict the life of a cable. There are, however, several physical and chemical ptoperty changes in cable insulation as a result of thermal and radiation damage. In principle, these properties may be targets for advanced NDE methods to provide early

  14. Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants - Interim Study FY13

    International Nuclear Information System (INIS)

    Simmons, Kevin L.; Fifield, Leonard S.; Westman, Matthew P.; Ramuhalli, Pradeep; Pardini, Allan F.; Tedeschi, Jonathan R.; Jones, Anthony M.

    2013-01-01

    The most important criterion for cable performance is its ability to withstand a design-basis accident. With nearly 1000 km of power, control, instrumentation, and other cables typically found in an NPP, it would be a significant undertaking to inspect all of the cables. Degradation of the cable jacket, electrical insulation, and other cable components is a key issue that is likely to affect the ability of the currently installed cables to operate safely and reliably for another 20 to 40 years beyond the initial operating life. The development of one or more nondestructive evaluation (NDE) techniques and supporting models that could assist in determining the remaining life expectancy of cables or their current degradation state would be of significant interest. The ability to nondestructively determine material and electrical properties of cable jackets and insulation without disturbing the cables or connections has been deemed essential. Currently, the only technique accepted by industry to measure cable elasticity (the gold standard for determining cable insulation degradation) is the indentation measurement. All other NDE techniques are used to find flaws in the cable and do not provide information to determine the current health or life expectancy. There is no single NDE technique that can satisfy all of the requirements needed for making a life-expectancy determination, but a wide range of methods have been evaluated for use in NPPs as part of a continuous evaluation program. The commonly used methods are indentation and visual inspection, but these are only suitable for easily accessible cables. Several NDE methodologies using electrical techniques are in use today for flaw detection but there are none that can predict the life of a cable. There are, however, several physical and chemical ptoperty changes in cable insulation as a result of thermal and radiation damage. In principle, these properties may be targets for advanced NDE methods to provide early

  15. Support vector machine based estimation of remaining useful life: current research status and future trends

    International Nuclear Information System (INIS)

    Huang, Hong Zhong; Wang, Hai Kun; Li, Yan Feng; Zhang, Longlong; Liu, Zhiliang

    2015-01-01

    Estimation of remaining useful life (RUL) is helpful to manage life cycles of machines and to reduce maintenance cost. Support vector machine (SVM) is a promising algorithm for estimation of RUL because it can easily process small training sets and multi-dimensional data. Many SVM based methods have been proposed to predict RUL of some key components. We did a literature review related to SVM based RUL estimation within a decade. The references reviewed are classified into two categories: improved SVM algorithms and their applications to RUL estimation. The latter category can be further divided into two types: one, to predict the condition state in the future and then build a relationship between state and RUL; two, to establish a direct relationship between current state and RUL. However, SVM is seldom used to track the degradation process and build an accurate relationship between the current health condition state and RUL. Based on the above review and summary, this paper points out that the ability to continually improve SVM, and obtain a novel idea for RUL prediction using SVM will be future works.

  16. Microscopic Void Detection for Predicting Remaining Life in Electric Cable Insulation

    International Nuclear Information System (INIS)

    Horvath, David A.; Avila, Steven M.

    2003-01-01

    A reliable method of testing for remaining life in electric cable insulation has continued to elude the nuclear industry as it seeks to extend the life and license of its nuclear stations. Until recently, a trendable, measurable electrical property has not been found, and unexpected cable failures continue to be reported. Most reliable approaches to date rely on monitoring mechanical properties, which are assumed to degrade faster than the insulation's electrical properties. This paper introduces a promising technique based on void characterization, which is dependent on an electrical property related to dielectric strength. A relationship between insulation void characteristics (size and density) and the onset of partial discharge is known to exist. A similar relationship can be shown between void characteristics and unacceptable leakage currents (another typical cable failure criterion). For low-voltage cables, it is believed void content can be correlated to mechanical property degradation.This paper will report on an approach for using void information, research results showing the existence of trendable void characteristics in commonly used electric insulation materials, and techniques for detecting the voids (both laboratory- and field-based techniques). Acoustical microscopy was found to be potentially more suitable than conventional ultrasound for nondestructive in situ detection and monitoring of void characteristics in jacketed multiconductor insulation while ignoring the jacket. Also, optical and scanning electron microscope techniques will play an essential role in establishing the database necessary for continued development and implementation of this promising technique

  17. Lithium-ion battery remaining useful life prediction based on grey support vector machines

    Directory of Open Access Journals (Sweden)

    Xiaogang Li

    2015-12-01

    Full Text Available In this article, an improved grey prediction model is proposed to address low-accuracy prediction issue of grey forecasting model. The first step is using a trigonometric function to transform the original data sequence to smooth the data, which is called smoothness of grey prediction model, and then a grey support vector machine model by integrating the improved grey model with support vector machine is introduced. At the initial stage of the model, trigonometric functions and accumulation generation operation can be used to preprocess the data, which enhances the smoothness of the data and reduces the associated randomness. In addition, support vector machine is implemented to establish a prediction model for the pre-processed data and select the optimal model parameters via genetic algorithms. Finally, the data are restored through the ‘regressive generate’ operation to obtain the forecasting data. To prove that the grey support vector machine model is superior to the other models, the battery life data from the Center for Advanced Life Cycle Engineering are selected, and the presented model is used to predict the remaining useful life of the battery. The predicted result is compared to that of grey model and support vector machines. For a more intuitive comparison of the three models, this article quantifies the root mean square errors for these three different models in the case of different ratio of training samples and prediction samples. The results show that the effect of grey support vector machine model is optimal, and the corresponding root mean square error is only 3.18%.

  18. Development and advance of methodological basis of the determination of remaining life of reinforced concrete construction of NPP

    International Nuclear Information System (INIS)

    Matchenko, T.Yi.; Shamyis, L.B.; Pervushova, L.F.; Matchenko, O.T.

    2011-01-01

    The analysis is made of the existing methodological basis on determination of the technical state and residual service life of building constructions with categories of responsibility 1 and 2. The absent norms parameters for estimation of the state and service life of constructions are determined. Components for the decision of this problem are analyzed also.

  19. Accurate bearing remaining useful life prediction based on Weibull distribution and artificial neural network

    Science.gov (United States)

    Ben Ali, Jaouher; Chebel-Morello, Brigitte; Saidi, Lotfi; Malinowski, Simon; Fnaiech, Farhat

    2015-05-01

    Accurate remaining useful life (RUL) prediction of critical assets is an important challenge in condition based maintenance to improve reliability and decrease machine's breakdown and maintenance's cost. Bearing is one of the most important components in industries which need to be monitored and the user should predict its RUL. The challenge of this study is to propose an original feature able to evaluate the health state of bearings and to estimate their RUL by Prognostics and Health Management (PHM) techniques. In this paper, the proposed method is based on the data-driven prognostic approach. The combination of Simplified Fuzzy Adaptive Resonance Theory Map (SFAM) neural network and Weibull distribution (WD) is explored. WD is used just in the training phase to fit measurement and to avoid areas of fluctuation in the time domain. SFAM training process is based on fitted measurements at present and previous inspection time points as input. However, the SFAM testing process is based on real measurements at present and previous inspections. Thanks to the fuzzy learning process, SFAM has an important ability and a good performance to learn nonlinear time series. As output, seven classes are defined; healthy bearing and six states for bearing degradation. In order to find the optimal RUL prediction, a smoothing phase is proposed in this paper. Experimental results show that the proposed method can reliably predict the RUL of rolling element bearings (REBs) based on vibration signals. The proposed prediction approach can be applied to prognostic other various mechanical assets.

  20. [Research on engine remaining useful life prediction based on oil spectrum analysis and particle filtering].

    Science.gov (United States)

    Sun, Lei; Jia, Yun-xian; Cai, Li-ying; Lin, Guo-yu; Zhao, Jin-song

    2013-09-01

    The spectrometric oil analysis(SOA) is an important technique for machine state monitoring, fault diagnosis and prognosis, and SOA based remaining useful life(RUL) prediction has an advantage of finding out the optimal maintenance strategy for machine system. Because the complexity of machine system, its health state degradation process can't be simply characterized by linear model, while particle filtering(PF) possesses obvious advantages over traditional Kalman filtering for dealing nonlinear and non-Gaussian system, the PF approach was applied to state forecasting by SOA, and the RUL prediction technique based on SOA and PF algorithm is proposed. In the prediction model, according to the estimating result of system's posterior probability, its prior probability distribution is realized, and the multi-step ahead prediction model based on PF algorithm is established. Finally, the practical SOA data of some engine was analyzed and forecasted by the above method, and the forecasting result was compared with that of traditional Kalman filtering method. The result fully shows the superiority and effectivity of the

  1. A new creep-strain-replica method for evaluating the remaining life time of components

    International Nuclear Information System (INIS)

    Joas, H.D.

    2001-01-01

    To realise a safe and economic operation of older power- or chemical plants a strategy for maintenance is necessary, which makes it possible to operate a component or the plant longer than 300,000 operating hours, this also for the situation that the mode of operation has changed meanwhile. In Germany a realistic evaluation of the remaining life-time is done by comparing the actual calculated test data of a component with the code TRD 301 and TRD 508 and additional non-destructive tests or other codes like ASME, Sec. II, BS 5500, AFCEN (1985). According to many boundary conditions, the calculated data are inaccurate and the measuring of creep-strain at temperatures of about 600 o C with capacitive strain-gauges very expensive. Description of the approach of the problems: spotwelding of two gauges to the surface of a component (in a defined distance), forming a gap, producing of replica of the gap after certain operating hours at shut-down conditions by trained personal, evaluation of the replica to gain the amount of creep-strain using a scanning electron microscope, assessment of the creep-strain data. (Author)

  2. Remaining useful life prediction based on the Wiener process for an aviation axial piston pump

    Directory of Open Access Journals (Sweden)

    Xingjian Wang

    2016-06-01

    Full Text Available An aviation hydraulic axial piston pump’s degradation from comprehensive wear is a typical gradual failure model. Accurate wear prediction is difficult as random and uncertain characteristics must be factored into the estimation. The internal wear status of the axial piston pump is characterized by the return oil flow based on fault mechanism analysis of the main frictional pairs in the pump. The performance degradation model is described by the Wiener process to predict the remaining useful life (RUL of the pump. Maximum likelihood estimation (MLE is performed by utilizing the expectation maximization (EM algorithm to estimate the initial parameters of the Wiener process while recursive estimation is conducted utilizing the Kalman filter method to estimate the drift coefficient of the Wiener process. The RUL of the pump is then calculated according to the performance degradation model based on the Wiener process. Experimental results indicate that the return oil flow is a suitable characteristic for reflecting the internal wear status of the axial piston pump, and thus the Wiener process-based method may effectively predicate the RUL of the pump.

  3. A novel health indicator for on-line lithium-ion batteries remaining useful life prediction

    Science.gov (United States)

    Zhou, Yapeng; Huang, Miaohua; Chen, Yupu; Tao, Ye

    2016-07-01

    Prediction of lithium-ion batteries remaining useful life (RUL) plays an important role in an intelligent battery management system. The capacity and internal resistance are often used as the batteries health indicator (HI) for quantifying degradation and predicting RUL. However, on-line measurement of capacity and internal resistance are hardly realizable due to the not fully charged and discharged condition and the extremely expensive cost, respectively. Therefore, there is a great need to find an optional way to deal with this plight. In this work, a novel HI is extracted from the operating parameters of lithium-ion batteries for degradation modeling and RUL prediction. Moreover, Box-Cox transformation is employed to improve HI performance. Then Pearson and Spearman correlation analyses are utilized to evaluate the similarity between real capacity and the estimated capacity derived from the HI. Next, both simple statistical regression technique and optimized relevance vector machine are employed to predict the RUL based on the presented HI. The correlation analyses and prediction results show the efficiency and effectiveness of the proposed HI for battery degradation modeling and RUL prediction.

  4. Remaining useful life prediction based on noisy condition monitoring signals using constrained Kalman filter

    International Nuclear Information System (INIS)

    Son, Junbo; Zhou, Shiyu; Sankavaram, Chaitanya; Du, Xinyu; Zhang, Yilu

    2016-01-01

    In this paper, a statistical prognostic method to predict the remaining useful life (RUL) of individual units based on noisy condition monitoring signals is proposed. The prediction accuracy of existing data-driven prognostic methods depends on the capability of accurately modeling the evolution of condition monitoring (CM) signals. Therefore, it is inevitable that the RUL prediction accuracy depends on the amount of random noise in CM signals. When signals are contaminated by a large amount of random noise, RUL prediction even becomes infeasible in some cases. To mitigate this issue, a robust RUL prediction method based on constrained Kalman filter is proposed. The proposed method models the CM signals subject to a set of inequality constraints so that satisfactory prediction accuracy can be achieved regardless of the noise level of signal evolution. The advantageous features of the proposed RUL prediction method is demonstrated by both numerical study and case study with real world data from automotive lead-acid batteries. - Highlights: • A computationally efficient constrained Kalman filter is proposed. • Proposed filter is integrated into an online failure prognosis framework. • A set of proper constraints significantly improves the failure prediction accuracy. • Promising results are reported in the application of battery failure prognosis.

  5. Remaining Useful Life Prediction for Lithium-Ion Batteries Based on Gaussian Processes Mixture

    Science.gov (United States)

    Li, Lingling; Wang, Pengchong; Chao, Kuei-Hsiang; Zhou, Yatong; Xie, Yang

    2016-01-01

    The remaining useful life (RUL) prediction of Lithium-ion batteries is closely related to the capacity degeneration trajectories. Due to the self-charging and the capacity regeneration, the trajectories have the property of multimodality. Traditional prediction models such as the support vector machines (SVM) or the Gaussian Process regression (GPR) cannot accurately characterize this multimodality. This paper proposes a novel RUL prediction method based on the Gaussian Process Mixture (GPM). It can process multimodality by fitting different segments of trajectories with different GPR models separately, such that the tiny differences among these segments can be revealed. The method is demonstrated to be effective for prediction by the excellent predictive result of the experiments on the two commercial and chargeable Type 1850 Lithium-ion batteries, provided by NASA. The performance comparison among the models illustrates that the GPM is more accurate than the SVM and the GPR. In addition, GPM can yield the predictive confidence interval, which makes the prediction more reliable than that of traditional models. PMID:27632176

  6. Remaining useful life prediction based on variation coefficient consistency test of a Wiener process

    Directory of Open Access Journals (Sweden)

    Juan LI

    2018-01-01

    Full Text Available High-cost equipment is often reused after maintenance, and whether the information before the maintenance can be used for the Remaining Useful Life (RUL prediction after the maintenance is directly determined by the consistency of the degradation pattern before and after the maintenance. Aiming at this problem, an RUL prediction method based on the consistency test of a Wiener process is proposed. Firstly, the parameters of the Wiener process estimated by Maximum Likelihood Estimation (MLE are proved to be biased, and a modified unbiased estimation method is proposed and verified by derivation and simulations. Then, the h statistic is constructed according to the reciprocal of the variation coefficient of the Wiener process, and the sampling distribution is derived. Meanwhile, a universal method for the consistency test is proposed based on the sampling distribution theorem, which is verified by simulation data and classical crack degradation data. Finally, based on the consistency test of the degradation model, a weighted fusion RUL prediction method is presented for the fuel pump of an airplane, and the validity of the presented method is verified by accurate computation results of real data, which provides a theoretical and practical guidance for engineers to predict the RUL of equipment after maintenance.

  7. Ensemble of data-driven prognostic algorithms for robust prediction of remaining useful life

    International Nuclear Information System (INIS)

    Hu Chao; Youn, Byeng D.; Wang Pingfeng; Taek Yoon, Joung

    2012-01-01

    Prognostics aims at determining whether a failure of an engineered system (e.g., a nuclear power plant) is impending and estimating the remaining useful life (RUL) before the failure occurs. The traditional data-driven prognostic approach is to construct multiple candidate algorithms using a training data set, evaluate their respective performance using a testing data set, and select the one with the best performance while discarding all the others. This approach has three shortcomings: (i) the selected standalone algorithm may not be robust; (ii) it wastes the resources for constructing the algorithms that are discarded; (iii) it requires the testing data in addition to the training data. To overcome these drawbacks, this paper proposes an ensemble data-driven prognostic approach which combines multiple member algorithms with a weighted-sum formulation. Three weighting schemes, namely the accuracy-based weighting, diversity-based weighting and optimization-based weighting, are proposed to determine the weights of member algorithms. The k-fold cross validation (CV) is employed to estimate the prediction error required by the weighting schemes. The results obtained from three case studies suggest that the ensemble approach with any weighting scheme gives more accurate RUL predictions compared to any sole algorithm when member algorithms producing diverse RUL predictions have comparable prediction accuracy and that the optimization-based weighting scheme gives the best overall performance among the three weighting schemes.

  8. A Hybrid Prognostic Approach for Remaining Useful Life Prediction of Lithium-Ion Batteries

    Directory of Open Access Journals (Sweden)

    Wen-An Yang

    2016-01-01

    Full Text Available Lithium-ion battery is a core component of many systems such as satellite, spacecraft, and electric vehicles and its failure can lead to reduced capability, downtime, and even catastrophic breakdowns. Remaining useful life (RUL prediction of lithium-ion batteries before the future failure event is extremely crucial for proactive maintenance/safety actions. This study proposes a hybrid prognostic approach that can predict the RUL of degraded lithium-ion batteries using physical laws and data-driven modeling simultaneously. In this hybrid prognostic approach, the relevant vectors obtained with the selective kernel ensemble-based relevance vector machine (RVM learning algorithm are fitted to the physical degradation model, which is then extrapolated to failure threshold for estimating the RUL of the lithium-ion battery of interest. The experimental results indicated that the proposed hybrid prognostic approach can accurately predict the RUL of degraded lithium-ion batteries. Empirical comparisons show that the proposed hybrid prognostic approach using the selective kernel ensemble-based RVM learning algorithm performs better than the hybrid prognostic approaches using the popular learning algorithms of feedforward artificial neural networks (ANNs like the conventional backpropagation (BP algorithm and support vector machines (SVMs. In addition, an investigation is also conducted to identify the effects of RVM learning algorithm on the proposed hybrid prognostic approach.

  9. Regression to fuzziness method for estimation of remaining useful life in power plant components

    Science.gov (United States)

    Alamaniotis, Miltiadis; Grelle, Austin; Tsoukalas, Lefteri H.

    2014-10-01

    Mitigation of severe accidents in power plants requires the reliable operation of all systems and the on-time replacement of mechanical components. Therefore, the continuous surveillance of power systems is a crucial concern for the overall safety, cost control, and on-time maintenance of a power plant. In this paper a methodology called regression to fuzziness is presented that estimates the remaining useful life (RUL) of power plant components. The RUL is defined as the difference between the time that a measurement was taken and the estimated failure time of that component. The methodology aims to compensate for a potential lack of historical data by modeling an expert's operational experience and expertise applied to the system. It initially identifies critical degradation parameters and their associated value range. Once completed, the operator's experience is modeled through fuzzy sets which span the entire parameter range. This model is then synergistically used with linear regression and a component's failure point to estimate the RUL. The proposed methodology is tested on estimating the RUL of a turbine (the basic electrical generating component of a power plant) in three different cases. Results demonstrate the benefits of the methodology for components for which operational data is not readily available and emphasize the significance of the selection of fuzzy sets and the effect of knowledge representation on the predicted output. To verify the effectiveness of the methodology, it was benchmarked against the data-based simple linear regression model used for predictions which was shown to perform equal or worse than the presented methodology. Furthermore, methodology comparison highlighted the improvement in estimation offered by the adoption of appropriate of fuzzy sets for parameter representation.

  10. REMAINING LIFE TIME PREDICTION OF BEARINGS USING K-STAR ALGORITHM – A STATISTICAL APPROACH

    Directory of Open Access Journals (Sweden)

    R. SATISHKUMAR

    2017-01-01

    Full Text Available The role of bearings is significant in reducing the down time of all rotating machineries. The increasing trend of bearing failures in recent times has triggered the need and importance of deployment of condition monitoring. There are multiple factors associated to a bearing failure while it is in operation. Hence, a predictive strategy is required to evaluate the current state of the bearings in operation. In past, predictive models with regression techniques were widely used for bearing lifetime estimations. The Objective of this paper is to estimate the remaining useful life of bearings through a machine learning approach. The ultimate objective of this study is to strengthen the predictive maintenance. The present study was done using classification approach following the concepts of machine learning and a predictive model was built to calculate the residual lifetime of bearings in operation. Vibration signals were acquired on a continuous basis from an experiment wherein the bearings are made to run till it fails naturally. It should be noted that the experiment was carried out with new bearings at pre-defined load and speed conditions until the bearing fails on its own. In the present work, statistical features were deployed and feature selection process was carried out using J48 decision tree and selected features were used to develop the prognostic model. The K-Star classification algorithm, a supervised machine learning technique is made use of in building a predictive model to estimate the lifetime of bearings. The performance of classifier was cross validated with distinct data. The result shows that the K-Star classification model gives 98.56% classification accuracy with selected features.

  11. Probabilistic Remaining Useful Life Prediction of Composite Aircraft Components, Phase II

    Data.gov (United States)

    National Aeronautics and Space Administration — A Probabilistic Fatigue Damage Assessment Network (PFDAN) toolkit for Abaqus will be developed for probabilistic life management of a laminated composite structure...

  12. The discount rate and the value of remaining years of life

    OpenAIRE

    Hartwick, John

    2008-01-01

    We back out an estimate of a personal discount rate of between 3 and 4 percent for a person with a life expectancy of 74 years who dies at age 30 (or 40) and has a value of statistical life of $6.3 million. Central to these calculations is the series generated by Murphy and Topel of value of life years (the dollar value of consumption plus the dollar value of leisure, with some smoothing for income in retirement). We employ the Makeham "model" of life expectancy in our calculations.

  13. Service life prediction and cementitious composites

    DEFF Research Database (Denmark)

    Stoklund Larsen, E.

    The present Ph.D.thesis describes and discusses the applicability of a systematic methodology recommended by CIB W80/RILEM-PSL for sevice life prediction. The report describes the most important inherent and environmental factors affecting the service life of structures of cementitious composites....... On the basis of this discription of factors and experience from a test programme described in SBI Report 222, Service life prediction and fibre reinforced cementitious composites, the applicabillity of the CIB/RILEM methodology is discussed....

  14. Review of the Remaining Useful Life Prognostics of Vehicle Lithium-Ion Batteries Using Data-Driven Methodologies

    Directory of Open Access Journals (Sweden)

    Lifeng Wu

    2016-05-01

    Full Text Available Lithium-ion batteries are the primary power source in electric vehicles, and the prognosis of their remaining useful life is vital for ensuring the safety, stability, and long lifetime of electric vehicles. Accurately establishing a mechanism model of a vehicle lithium-ion battery involves a complex electrochemical process. Remaining useful life (RUL prognostics based on data-driven methods has become a focus of research. Current research on data-driven methodologies is summarized in this paper. By analyzing the problems of vehicle lithium-ion batteries in practical applications, the problems that need to be solved in the future are identified.

  15. In-Service Aircraft Transmission Life Modeling for Improved Flight Safety, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — It is proposed to develop an accurate, in-service transmission life-estimation system for the prediction of remaining component and system life for a helicopter...

  16. In-Service Aircraft Transmission Life Modeling for Improved Flight Safety, Phase II

    Data.gov (United States)

    National Aeronautics and Space Administration — It is proposed to develop an accurate, in-service transmission life-use estimation system for the prediction of remaining component and system life for a helicopter...

  17. Remaining life case history studies for high energy piping systems using equivalent stress

    International Nuclear Information System (INIS)

    Cohn, M.J.

    1987-01-01

    As the development of plant life extension for high energy piping systems is progressing, conventional piping system design methodologies are also being reevaluated. Traditional guidelines such as American National Standard Institute/American Society of Mechanical Engineers B31.1 (ANSI/ASME) were developed for plants having design lives in the 25- to 30-year regime based upon relatively short-term base metal creep data. These guidelines use a simplified approach for the piping analysis. Two types of stress criteria must be satisfied. The first type is longitudinal plus torsion stress checks for several types of loading conditions versus the material allowable stresses. The second type is an independent minimum wall thickness check which considers the hoop stress versus the material allowable stress. Seven case histories have been evaluated to estimate the minimum piping system creep life based on the current ANSI/ASME B31.1 finite element type of analysis, which is a traditional approach, versus a multiaxial stress state type of analysis. In nearly every case, the equivalent stress methodology predicted significantly higher stresses. Consequently, the equivalent stress methodology resulted in 11 to 96% lower time to rupture values as compared to the values predicted using ANSI/ASME B31.1 stresses

  18. A probabilistic degradation model for the estimation of the remaining life distribution of feeders

    International Nuclear Information System (INIS)

    Yuan, X.-X.; Pandey, M.D.; Bickel, G.A.

    2006-01-01

    Wall thinning due to flow accelerated corrosion (FAC) is a pervasive form of degradation in the outlet feeder pipes of the primary heat transport system of CANDU reactors. The prediction of the end-of-life of a feeder from wall thickness measurement data is confounded by the sampling and temporal uncertainties associated with the FAC degradation phenomenon. Traditional regression-based statistical methods deal with only the sampling uncertainties, leaving the temporal uncertainties unresolved. This paper presents an advanced probabilistic model, which is able to integrate the temporal uncertainties into the prediction of lifetime. In particular, a random gamma process model is proposed to model the FAC process and it is calibrated with a set of wall thickness measurements using the method of maximum likelihood. This information can be used to establish an optimum strategy for inspection and replacement of feeders. (author)

  19. Remaining Useful Life Estimation using Time Trajectory Tracking and Support Vector Machines

    International Nuclear Information System (INIS)

    Galar, D; Kumar, U; Lee, J; Zhao, W

    2012-01-01

    In this paper, a novel RUL prediction method inspired by feature maps and SVM classifiers is proposed. The historical instances of a system with life-time condition data are used to create a classification by SVM hyper planes. For a test instance of the same system, whose RUL is to be estimated, degradation speed is evaluated by computing the minimal distance defined based on the degradation trajectories, i.e. the approach of the system to the hyper plane that segregates good and bad condition data at different time horizon. Therefore, the final RUL of a specific component can be estimated and global RUL information can then be obtained by aggregating the multiple RUL estimations using a density estimation method.

  20. Lung Abscess Remains a Life-Threatening Condition in Pediatrics – A Case Report

    Directory of Open Access Journals (Sweden)

    Chirteș Ioana Raluca

    2017-07-01

    Full Text Available Pulmonary abscess or lung abscess is a lung infection which destroys the lung parenchyma leading to cavitations and central necrosis in localised areas formed by thick-walled purulent material. It can be primary or secondary. Lung abscesses can occur at any age, but it seems that paediatric pulmonary abscess morbidity is lower than in adults. We present the case of a one year and 5-month-old male child admitted to our clinic for fever, loss of appetite and an overall altered general status. Laboratory tests revealed elevated inflammatory biomarkers, leukocytosis with neutrophilia, anaemia, thrombocytosis, low serum iron concentration and increased lactate dehydrogenase level. Despite wide-spectrum antibiotic therapy, the patient’s progress remained poor after seven days of treatment and a CT scan established the diagnosis of a large lung abscess. Despite changing the antibiotic therapy, surgical intervention was eventually needed. There was a slow but steady improvment and eventually, the patient was discharged after approximately five weeks.

  1. Maximum utilization of primary reformer catalyst tubes careful assessment of remaining life-An experience at an ammonia plant

    International Nuclear Information System (INIS)

    Malik, M.A.

    2005-01-01

    Condition evaluation and residual life assessment of Reformer Catalyst Tubes has always been a point of concern for Ammonia and Methanol Plant operators. Failure of catalyst tubes results in total plant shutdown and consequent production loss. On the other hand, replacement of these tubes entails major cost impact on the company's budget, being a capital expenditure. A careful Residual Life Assessment of the tubes is therefore of utmost importance for maximum utilization of these tubes without jeopardizing plant operational reliability. This paper presents an experience of extracting maximum service life from the catalyst tubes of Primary Reformer of an Ammonia Plant. Fauji Fertilizer Company (FFC) has been operating the plant since 1982, having a designed capacity of 1100 MTPD. Its Primary Reformer has 288 catalyst tubes of IN-519 material (24Cr-24Ni-Nb). The design temperature and pressures are 925 degree C and 38kg/Cm respectively. Thanks to the optimum operating conditions, regular inspections and careful assessment of the residual life, the tubes have achieved more than double of the designed life and are still operating reliably. To evaluate the tube's health, Ultrasonic Inspection (UT) was carried out in 1987 and 1994 using attenuation technique. The tubes with maximum attenuation were marked for further evaluation. Accelerated Creep Rupture Test was carried out on sample tubes periodically (1996, 2001 and 2004). Tubes were selected on the basis of UT results, TMT (Tube Metal Temperature) monitoring and Inspection findings. Based on the combined results of DT, NDT, equipment history and foreseen operational parameters, the life of these tubes was carefully assessed periodically. The tubes have been in service for more than 23 years (design life: 11 years) and a further life of 04 years has been predicted as per last assessment.The experience of successful health evaluation and residual life assessment has saved substantial cost involved in tubes replacement

  2. Current Size and Remaining Market Potential of the U.S. Energy Service Company Industry

    Energy Technology Data Exchange (ETDEWEB)

    Stuart, Elizabeth [Ernest Orlando Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Larsen, Peter H. [Ernest Orlando Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Goldman, Charles A. [Ernest Orlando Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Gilligan, Donald [Ernest Orlando Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); National Association of Energy Services Companies

    2013-06-27

    In this study, we analyze the market size, growth projections and industry trends in the U.S. ESCO industry, drawing on information from interviews with ESCO executives conducted in late 2012. We define ESCOs as energy service companies for whom performance -based contracting is a key business activity; 45 companies met our definition of an ESCO. We were able to interview 35 of these companies, which represents ~78% response rate. The non-respondent ESCOs were small companies in terms of revenue, representing about 2% of industry revenues.

  3. Life assessment of gas turbine blades after long term service

    Energy Technology Data Exchange (ETDEWEB)

    Auerkari, Pertti; Salonen, Jorma [VTT, Espoo (Finland); Maekinen, Sari [Helsingin Energia, Helsinki (Finland); Karvonen, Ikka; Tanttari, Heikki [Lappeenrannan Laempoevoima, Lappeenranta (Finland); Kangas, Pekka [Neste Oil, Kilpilahti (Finland); Scholz, Alfred [Technische Univ. Darmstadt (Germany); Vacchieri, Erica [Ansaldo Richerche, Genoa (Italy)

    2010-07-01

    Turbine blade samples from three land based gas turbines have been subjected to systematic condition and life assessment after long term service (88000 - 109000 equivalent operating hours, eoh), when approaching the nominal or suggested life limits. The blades represent different machine types, materials and design generations, and uncooled blading outside the hottest front end of the turbine, i.e. blades with relatively large size and considerable expected life. For a reasonable assessment, a range of damage mechanisms need to be addressed and evaluated for the impact in the residual life. The results suggested significant additional safe life for all three blade sets. In some cases this could warrant yet another life cycle comparable to that of new blades, even after approaching the nominal end of life in terms of recommended equivalent operating hours. This is thought to be partly because of base load combined cycle operation and natural gas fuel, or modest operational loading if the design also accounted for more intensive cycling operation and more corrosive oil firing. In any case, long term life extension is only appropriate if not intervened by events of overloading, overheating or other sudden events such as foreign object damage (FOD), and if supported by the regular inspection and maintenance program to control in-service damage. Condition based assessment therefore remains an important part of the blade life management after the decision of accepted life extension. (orig.)

  4. A case study of remaining storage life prediction using stochastic filtering with the influence of condition monitoring

    International Nuclear Information System (INIS)

    Wang, Zhaoqiang; Hu, Changhua; Wang, Wenbin; Zhou, Zhijie; Si, Xiaosheng

    2014-01-01

    Some systems may spend most of their time in storage, but once needed, must be fully functional. Slow degradation occurs when the system is in storage, so to ensure the functionality of these systems, condition monitoring is usually conducted periodically to check the condition of the system. However, taking the condition monitoring data may require putting the system under real testing situation which may accelerate the degradation, and therefore, shorten the storage life of the system. This paper presents a case study of condition-based remaining storage life prediction for gyros in the inertial navigation system on the basis of the condition monitoring data and the influence of the condition monitoring data taking process. A stochastic-filtering-based degradation model is developed to incorporate both into the prediction of the remaining storage life distribution. This makes the predicted remaining storage life depend on not only the condition monitoring data but also the testing process of taking the condition monitoring data, which the existing prognostic techniques and algorithms did not consider. The presented model is fitted to the real condition monitoring data of gyros testing using the maximum likelihood estimation method for parameter estimation. Comparisons are made with the model without considering the process of taking the condition monitoring data, and the results clearly demonstrate the superiority of the newly proposed model

  5. Cultural services remediated in Second Life

    DEFF Research Database (Denmark)

    Heilesen, Simon

    2008-01-01

    In 2007, the Danish Public Libraries conducted an experiment in establishing a library in the virtual world Second Life. The Info Island DK provided the framework for a number of online library services and cultural events. This study, based on interviews with most of the active participants...... in the project, discusses the experiences in remediating conventional library services into the new medium and in understanding and redefining the role of the librarian in an online virtual world....

  6. A kernel principal component analysis–based degradation model and remaining useful life estimation for the turbofan engine

    Directory of Open Access Journals (Sweden)

    Delong Feng

    2016-05-01

    Full Text Available Remaining useful life estimation of the prognostics and health management technique is a complicated and difficult research question for maintenance. In this article, we consider the problem of prognostics modeling and estimation of the turbofan engine under complicated circumstances and propose a kernel principal component analysis–based degradation model and remaining useful life estimation method for such aircraft engine. We first analyze the output data created by the turbofan engine thermodynamic simulation that is based on the kernel principal component analysis method and then distinguish the qualitative and quantitative relationships between the key factors. Next, we build a degradation model for the engine fault based on the following assumptions: the engine has only had constant failure (i.e. no sudden failure is included, and the engine has a Wiener process, which is a covariate stand for the engine system drift. To predict the remaining useful life of the turbofan engine, we built a health index based on the degradation model and used the method of maximum likelihood and the data from the thermodynamic simulation model to estimate the parameters of this degradation model. Through the data analysis, we obtained a trend model of the regression curve line that fits with the actual statistical data. Based on the predicted health index model and the data trend model, we estimate the remaining useful life of the aircraft engine as the index reaches zero. At last, a case study involving engine simulation data demonstrates the precision and performance advantages of this prediction method that we propose. At last, a case study involving engine simulation data demonstrates the precision and performance advantages of this proposed method, the precision of the method can reach to 98.9% and the average precision is 95.8%.

  7. A Bayesian least-squares support vector machine method for predicting the remaining useful life of a microwave component

    Directory of Open Access Journals (Sweden)

    Fuqiang Sun

    2017-01-01

    Full Text Available Rapid and accurate lifetime prediction of critical components in a system is important to maintaining the system’s reliable operation. To this end, many lifetime prediction methods have been developed to handle various failure-related data collected in different situations. Among these methods, machine learning and Bayesian updating are the most popular ones. In this article, a Bayesian least-squares support vector machine method that combines least-squares support vector machine with Bayesian inference is developed for predicting the remaining useful life of a microwave component. A degradation model describing the change in the component’s power gain over time is developed, and the point and interval remaining useful life estimates are obtained considering a predefined failure threshold. In our case study, the radial basis function neural network approach is also implemented for comparison purposes. The results indicate that the Bayesian least-squares support vector machine method is more precise and stable in predicting the remaining useful life of this type of components.

  8. A new hybrid method for the prediction of the remaining useful life of a lithium-ion battery

    International Nuclear Information System (INIS)

    Chang, Yang; Fang, Huajing; Zhang, Yong

    2017-01-01

    Highlights: •The proposed prognostic method can make full use of historical information. •The method of obtaining historical error data is discussed in detail. •Comparative experiments based on data-driven and model-based methods are performed. •Battery working with different discharging currents is considered. -- Abstract: The lithium-ion battery has become the main power source of many electronic devices, it is necessary to know its state-of-health and remaining useful life to ensure the reliability of electronic device. In this paper, a novel hybrid method with the thought of error-correction is proposed to predict the remaining useful life of lithium-ion battery, which fuses the algorithms of unscented Kalman filter, complete ensemble empirical mode decomposition (CEEMD) and relevance vector machine. Firstly, the unscented Kalman filter algorithm is adopted to obtain a prognostic result based on an estimated model and produce a raw error series. Secondly, a new error series is constructed by analyzing the decomposition results of the raw error series obtained by CEEMD method. Finally, the new error series is utilized by relevance vector machine regression model to predict the prognostic error which is adopted to correct the prognostic result obtained by unscented Kalman filter. Remaining useful life prediction experiments for batteries with different rated capacities and discharging currents are performed to show the high reliability of the proposed hybrid method.

  9. Nonlinear-drifted Brownian motion with multiple hidden states for remaining useful life prediction of rechargeable batteries

    Science.gov (United States)

    Wang, Dong; Zhao, Yang; Yang, Fangfang; Tsui, Kwok-Leung

    2017-09-01

    Brownian motion with adaptive drift has attracted much attention in prognostics because its first hitting time is highly relevant to remaining useful life prediction and it follows the inverse Gaussian distribution. Besides linear degradation modeling, nonlinear-drifted Brownian motion has been developed to model nonlinear degradation. Moreover, the first hitting time distribution of the nonlinear-drifted Brownian motion has been approximated by time-space transformation. In the previous studies, the drift coefficient is the only hidden state used in state space modeling of the nonlinear-drifted Brownian motion. Besides the drift coefficient, parameters of a nonlinear function used in the nonlinear-drifted Brownian motion should be treated as additional hidden states of state space modeling to make the nonlinear-drifted Brownian motion more flexible. In this paper, a prognostic method based on nonlinear-drifted Brownian motion with multiple hidden states is proposed and then it is applied to predict remaining useful life of rechargeable batteries. 26 sets of rechargeable battery degradation samples are analyzed to validate the effectiveness of the proposed prognostic method. Moreover, some comparisons with a standard particle filter based prognostic method, a spherical cubature particle filter based prognostic method and two classic Bayesian prognostic methods are conducted to highlight the superiority of the proposed prognostic method. Results show that the proposed prognostic method has lower average prediction errors than the particle filter based prognostic methods and the classic Bayesian prognostic methods for battery remaining useful life prediction.

  10. Anesthesia Service Use During Outpatient Gastroenterology Procedures Continued to Increase From 2010 to 2013 and Potentially Discretionary Spending Remained High.

    Science.gov (United States)

    Predmore, Zachary; Nie, Xiaoyu; Main, Regan; Mattke, Soeren; Liu, Hangsheng

    2017-02-01

    Previous studies have identified an increasing number of gastroenterology (GI) procedures using anesthesia services to provide sedation, with a majority of these services delivered to low-risk patients. The aim of this study was to update these trends with the most recent years of data. We used Medicare and commercial claims data from 2010 to 2013 to identify GI procedures and anesthesia services based on CPT codes, which were linked together using patient identifiers and dates of service. We defined low-risk patients as those who were classified as ASA (American Society of Anesthesiologists) physical status class I or II. For those patients without an ASA class listed on the claim, we used a prediction algorithm to impute an ASA physical status. Over 6.6 million patients in our sample had a GI procedure between 2010 and 2013. GI procedures involving anesthesia service accounted for 33.7% in 2010 and 47.6% in 2013 in Medicare patients, and 38.3% in 2010 and 53.0% in 2013 in commercially insured patients. Overall, as more patients used anesthesia services, total anesthesia service use in low-risk patients increased 14%, from 27,191 to 33,181 per million Medicare enrollees. Similarly, we observed a nearly identical uptick in commercially insured patients from 15,871 to 22,247 per million, an increase of almost 15%. During 2010-2013, spending associated with anesthesia services in low-risk patients increased from US$3.14 million to US$3.45 million per million Medicare enrollees and from US$7.69 million to US$10.66 million per million commercially insured patients. During 2010 to 2013, anesthesia service use in GI procedures continued to increase and the proportion of these services rendered for low-risk patients remained high.

  11. 9. Nuclear power plant service life prolongation

    International Nuclear Information System (INIS)

    Evropin, S.V.

    1998-01-01

    The problem of prolongation of nuclear power plant service life duration is discussed. A schematic diagram of the program developed in the course of activities dealing with NPP service time prolongation is shown and analyzed in details. It is shown that the basic moment when determining the strategy for NPP service time prolongation is the positive confirmation of the agreement between the NPP safety provisions and modern safety requirements. The other very important aspect of the problem is engineering substantiation of the measures assuring the reactor operation prolongation. The conclusion is made that available methods of recovering reactor materials properties, main components repair and replacement, the modern techniques for nondestructive testing of metals and NPP pipelines, as well as the developed approaches to reactor facility safety improvements make the prolongation of the Russian NPP service lifetimes possible from engineering viewpoint and economically desirable

  12. Software life after in-service

    International Nuclear Information System (INIS)

    Tseng, M.; Eng, P.

    1993-01-01

    Software engineers and designers tend to conclude a software project at the in-service milestone of the software life cycle. But the reality is that the 'life after in-service' is significantly longer than other phases of the life cycle, typically 20 years or more depending on the maintainability of the hardware platform and the designed life of the plant. During this period, the software asset (as with other physical assets in the plant) continues to be upgraded to correct deficiencies, meet new requirements, cope with obsolescence of equipment and so on. The software life cycle ends with a migration of the software to a different platform. It is typical in a software development project to put a great deal of emphasis on design methodologies, techniques, tools, development environment, standard procedures, and project management to ensure quality product is delivered on schedule and within budget. More often than not, a disproportion of emphasis is placed on the issues and needs of the in-service phase. Once the software is in-service, the designers move on to other projects, while the maintenance and support staff must manage the software. This paper examines the issues in three steps. First it presents a view of software from maintenance and support staff perspectives, including complexity of software, suitability of documentation, configuration management, training, difficulties and risks associated with making changes, required skills and knowledge. Second, it identifies the concerns raised from these viewpoints, including costs of maintaining the software, ability to meet additional requirements, availability of support tools, length of time required to engineer and install changes, and a strategy for the migration of software asset. Finally it discusses some approaches to deal with the concerns. (Author) 5 refs., fig

  13. Actual service life prediction of building components

    DEFF Research Database (Denmark)

    Aagaard, Niels-Jørgen; Brandt, Erik; Hansen, Ernst Jan de Place

    2014-01-01

    In recent years, sustainability and life cycle cost in the construction industry have been given great attention in many countries due to the heavy climatic and environmental impact from this sector. In Denmark, a sustainability certification scheme for buildings has been developed including....... Finally, it is discussed how to adjust the model for practical purposes, and a scheme for actual service life for selected building components important for analysis of sustainability is linked. The schemes are now being implemented as basis for sustainability certification of new buildings in Denmark....

  14. Fee-for-service will remain a feature of major payment reforms, requiring more changes in Medicare physician payment.

    Science.gov (United States)

    Ginsburg, Paul B

    2012-09-01

    Many health policy analysts envision provider payment reforms currently under development as replacements for the traditional fee-for-service payment system. Reforms include per episode bundled payment and elements of capitation, such as global payments or accountable care organizations. But even if these approaches succeed and are widely adopted, the core method of payment to many physicians for the services they provide is likely to remain fee-for-service. It is therefore critical to address the current shortcomings in the Medicare physician fee schedule, because it will affect physician incentives and will continue to play an important role in determining the payment amounts under payment reform. This article reviews how the current payment system developed and is applied, and it highlights areas that require careful review and modification to ensure the success of broader payment reform.

  15. A Hybrid PCA-CART-MARS-Based Prognostic Approach of the Remaining Useful Life for Aircraft Engines

    Directory of Open Access Journals (Sweden)

    Fernando Sánchez Lasheras

    2015-03-01

    Full Text Available Prognostics is an engineering discipline that predicts the future health of a system. In this research work, a data-driven approach for prognostics is proposed. Indeed, the present paper describes a data-driven hybrid model for the successful prediction of the remaining useful life of aircraft engines. The approach combines the multivariate adaptive regression splines (MARS technique with the principal component analysis (PCA, dendrograms and classification and regression trees (CARTs. Elements extracted from sensor signals are used to train this hybrid model, representing different levels of health for aircraft engines. In this way, this hybrid algorithm is used to predict the trends of these elements. Based on this fitting, one can determine the future health state of a system and estimate its remaining useful life (RUL with accuracy. To evaluate the proposed approach, a test was carried out using aircraft engine signals collected from physical sensors (temperature, pressure, speed, fuel flow, etc.. Simulation results show that the PCA-CART-MARS-based approach can forecast faults long before they occur and can predict the RUL. The proposed hybrid model presents as its main advantage the fact that it does not require information about the previous operation states of the input variables of the engine. The performance of this model was compared with those obtained by other benchmark models (multivariate linear regression and artificial neural networks also applied in recent years for the modeling of remaining useful life. Therefore, the PCA-CART-MARS-based approach is very promising in the field of prognostics of the RUL for aircraft engines.

  16. Advances in through-life engineering services

    CERN Document Server

    Roy, Rajkumar; Shaw, Andy

    2017-01-01

    This edited book offers further advances, new perspectives, and developments from world leaders in the field of through-life engineering services (TES). It builds up on the earlier book by the same authors entitled: “Through-life Engineering Services: Motivation, Theory and Practice.” This compendium introduces and discusses further, the developments in workshop-based and 'in situ' maintenance and support of high-value engineering products, as well as the application of drone technology for autonomous and self-healing product support. The links between ‘integrated planning’ and planned obsolescence, risk and cost modelling are also examined. The role of data, information, and knowledge management relative to component and system degradation and failure is also presented. This is supported by consideration of the effects upon the maintenance and support decision by the presence of 'No Fault Found' error signals within system data. Further to this the role of diagnostics and prognostics is also discusse...

  17. Service life optimization and extension of structures

    International Nuclear Information System (INIS)

    Hornet, P.; Venturini, V.; Persoz, M.; Debost-Eymard, I.; Meister, E.

    1998-01-01

    In order to justify its power plants safety which conditions their service life, EDF uses a deterministic approach until now. A probabilistic approach also exists which has a decisive advantage because it quantifies risk and makes it possible to optimize maintenance volume. The application of this approach is illustrated on the case of a reactor vessel; a coupling between the Code Aster tool and a probabilistic analysis software is necessary. (authors)

  18. Light Water Reactor Sustainability (LWRS) Program – Non-Destructive Evaluation (NDE) R&D Roadmap for Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Simmons, Kevin L.; Ramuhalli, Pradeep; Brenchley, David L.; Coble, Jamie B.; Hashemian, Hash; Konnik, Robert; Ray, Sheila

    2012-09-14

    The purpose of the non-destructive evaluation (NDE) R&D Roadmap for Cables is to support the Materials Aging and Degradation (MAaD) R&D pathway. The focus of the workshop was to identify the technical gaps in detecting aging cables and predicting their remaining life expectancy. The workshop was held in Knoxville, Tennessee, on July 30, 2012, at Analysis and Measurement Services Corporation (AMS) headquarters. The workshop was attended by 30 experts in materials, electrical engineering, U.S. Nuclear Regulatory Commission (NRC), U.S. Department of Energy (DOE) National Laboratories (Oak Ridge National Laboratory, Pacific Northwest National Laboratory, Argonne National Laboratory, and Idaho National Engineering Laboratory), NDE instrumentation development, universities, commercial NDE services and cable manufacturers, and Electric Power Research Institute (EPRI). The motivation for the R&D roadmap comes from the need to address the aging management of in-containment cables at nuclear power plants (NPPs).

  19. Light Water Reactor Sustainability (LWRS) Program – Non-Destructive Evaluation (NDE) R&D Roadmap for Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Simmons, K.L.; Ramuhali, P.; Brenchley, D.L.; Coble, J.B.; Hashemian, H.M.; Konnick, R.; Ray, S.

    2012-09-01

    Executive Summary [partial] The purpose of the non-destructive evaluation (NDE) R&D Roadmap for Cables is to support the Materials Aging and Degradation (MAaD) R&D pathway. A workshop was held to gather subject matter experts to develop the NDE R&D Roadmap for Cables. The focus of the workshop was to identify the technical gaps in detecting aging cables and predicting their remaining life expectancy. The workshop was held in Knoxville, Tennessee, on July 30, 2012, at Analysis and Measurement Services Corporation (AMS) headquarters. The workshop was attended by 30 experts in materials, electrical engineering, and NDE instrumentation development from the U.S. Nuclear Regulatory Commission (NRC), U.S. Department of Energy (DOE) National Laboratories (Oak Ridge National Laboratory, Pacific Northwest National Laboratory, Argonne National Laboratory, and Idaho National Engineering Laboratory), universities, commercial NDE service vendors and cable manufacturers, and the Electric Power Research Institute (EPRI).

  20. Evaluation of HEPA filter service life

    International Nuclear Information System (INIS)

    Fretthold, J.K.; Stithem, A.R.

    1997-01-01

    Rocky Flats Environmental Technology Site (RFETS), has approximately 10,000 High Efficiency Particulate Air (HEPA) Filters installed in a variety of filter plenums. These ventilation/filtration plenum systems are used to control the release of airborne particulate contaminates to the environment during normal operations and potential accidents. This report summarizes the results of destructive and non-destructive tests on HEPA filters obtained from a wide variety of ages and service conditions. These tests were performed to determine an acceptable service life criteria for HEPA filters used at Rocky Flats Environmental Technology Site (RFETS). A total of 140 filters of various ages (1972 to 1996) and service history (new, aged unused, used) were tested. For the purpose of this report, filter age from manufacture date/initial test date to the current sample date was used, as opposed to the actual time a filter was installed in an operating system

  1. Service life evaluation of non-metallic containment seals

    International Nuclear Information System (INIS)

    Pringle, T.G.

    1994-01-01

    A Service Life Evaluation Program (SLEP) was successfully completed for expansion joint seals used in the pressure relief duct of Pickering NGS, an eight unit CANDU station. These seals are part of the containment boundary, are difficult to replace and then only during station outages which are scheduled at ten year intervals. The SLEP, consisting of an accelerated aging program and a qualification test, was undertaken to determine the service life of the seals such that they would be capable of remaining functional following a combination of service life, a design basis accident and a subsequent seismic event. The Arrhenius model of aging was used for the accelerated aging program. Samples of seal material were subjected to oven aging at five temperatures, 150, 160, 170, 180 and 190 deg C. Tensile properties and hardness were measured at various aging times and Arrhenius plots constructed. Based on changes in elongation, activation energies of 1.2 eV and 1.1 eV were calculated for the reinforcing fabric and the silicone cover rubber, respectively. Hardness measurements were also taken but as expected, no precise quantitative aging relationship could be determined from material hardness. For the qualification test a representative length of seal was installed and field-spliced in a test frame built to simulate the installed configuration of the seal. It then underwent accelerated aging equivalent to the service life, followed by LOCA irradiation exposure to LOCA conditions of humidity, temperature and pressure and a design-basis seismic event. Finally, a pressure test to approximately five times design pressure was successfully performed to demonstrate the remaining margin of safety. Periodic air leakage tests indicated no deterioration in sealing performance and no physical deterioration was apparent. (author). 11 refs., 2 tabs., 8 figs

  2. Remaining Useful Life Estimation of Li-ion Battery for Energy Storage System Using Markov Chain Monte Carlo Method

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Dongjin; Kim, Seok Goo; Choi, Jooho; Lee, Jaewook [Korea Aerospace Univ., Koyang (Korea, Republic of); Song, Hwa Seob; Park, Sang Hui [Hyosung Corporation, Seoul (Korea, Republic of)

    2016-10-15

    Remaining useful life (RUL) estimation of the Li-ion battery has gained great interest because it is necessary for quality assurance, operation planning, and determination of the exchange period. This paper presents the RUL estimation of an Li-ion battery for an energy storage system using exponential function for the degradation model and Markov Chain Monte Carlo (MCMC) approach for parameter estimation. The MCMC approach is dependent upon information such as model initial parameters and input setting parameters which highly affect the estimation result. To overcome this difficulty, this paper offers a guideline for model initial parameters based on the regression result, and MCMC input parameters derived by comparisons with a thorough search of theoretical results.

  3. Tool Condition Monitoring and Remaining Useful Life Prognostic Based on a Wireless Sensor in Dry Milling Operations

    Directory of Open Access Journals (Sweden)

    Cunji Zhang

    2016-05-01

    Full Text Available Tool breakage causes losses of surface polishing and dimensional accuracy for machined part, or possible damage to a workpiece or machine. Tool Condition Monitoring (TCM is considerably vital in the manufacturing industry. In this paper, an indirect TCM approach is introduced with a wireless triaxial accelerometer. The vibrations in the three vertical directions (x, y and z are acquired during milling operations, and the raw signals are de-noised by wavelet analysis. These features of de-noised signals are extracted in the time, frequency and time–frequency domains. The key features are selected based on Pearson’s Correlation Coefficient (PCC. The Neuro-Fuzzy Network (NFN is adopted to predict the tool wear and Remaining Useful Life (RUL. In comparison with Back Propagation Neural Network (BPNN and Radial Basis Function Network (RBFN, the results show that the NFN has the best performance in the prediction of tool wear and RUL.

  4. Remaining Useful Life Estimation of Li-ion Battery for Energy Storage System Using Markov Chain Monte Carlo Method

    International Nuclear Information System (INIS)

    Kim, Dongjin; Kim, Seok Goo; Choi, Jooho; Lee, Jaewook; Song, Hwa Seob; Park, Sang Hui

    2016-01-01

    Remaining useful life (RUL) estimation of the Li-ion battery has gained great interest because it is necessary for quality assurance, operation planning, and determination of the exchange period. This paper presents the RUL estimation of an Li-ion battery for an energy storage system using exponential function for the degradation model and Markov Chain Monte Carlo (MCMC) approach for parameter estimation. The MCMC approach is dependent upon information such as model initial parameters and input setting parameters which highly affect the estimation result. To overcome this difficulty, this paper offers a guideline for model initial parameters based on the regression result, and MCMC input parameters derived by comparisons with a thorough search of theoretical results

  5. An On-Board Remaining Useful Life Estimation Algorithm for Lithium-Ion Batteries of Electric Vehicles

    Directory of Open Access Journals (Sweden)

    Xiaoyu Li

    2017-05-01

    Full Text Available Battery remaining useful life (RUL estimation is critical to battery management and performance optimization of electric vehicles (EVs. In this paper, we present an effective way to estimate RUL online by using the support vector machine (SVM algorithm. By studying the characteristics of the battery degradation process, the rising of the terminal voltage and changing characteristics of the voltage derivative (DV during the charging process are introduced as the training variables of the SVM algorithm to determine the battery RUL. The SVM is then applied to build the battery degradation model and predict the battery real cycle numbers. Experimental results prove that the built battery degradation model shows higher accuracy and less computation time compared with those of the neural network (NN method, thereby making it a potential candidate for realizing online RUL estimation in a battery management system (BMS.

  6. Role of stable isotope analyses in reconstructing past life-histories and the provenancing human skeletal remains: a review

    Directory of Open Access Journals (Sweden)

    Sehrawat Jagmahender Singh

    2017-09-01

    Full Text Available This article reviews the present scenario of use of stable isotopes (mainly δ13C, δ15N, δ18O, 87Sr to trace past life behaviours like breast feeding and weaning practices, the geographic origin, migration history, paleodiet and subsistence patterns of past populations from the chemical signatures of isotopes imprinted in human skeletal remains. This approach is based on the state that food-web isotopic signatures are seen in the human bones and teeth and such signatures can change parallely with a variety of biogeochemical processes. By measuring δ13C and δ15N isotopic values of subadult tissues of different ages, the level of breast milk ingestion at particular ages and the components of the complementary foods can be assessed. Strontium and oxygen isotopic analyses have been used for determining the geographic origins and reconstructing the way of life of past populations as these isotopes can map the isotopic outline of the area from where the person acquired water and food during initial lifetime. The isotopic values of strontium and oxygen values are considered specific to geographical areas and serve as reliable chemical signatures of migration history of past human populations (local or non-local to the site. Previous isotopic studies show that the subsistence patterns of the past human populations underwent extensive changes from nomadic to complete agricultural dependence strategies. The carbon and nitrogen isotopic values of local fauna of any archaeological site can be used to elucidate the prominence of freshwater resources in the diet of the past human populations found near the site. More extensive research covering isotopic descriptions of various prehistoric, historic and modern populations is needed to explore the role of stable isotope analysis for provenancing human skeletal remains and assessing human migration patterns/routes, geographic origins, paleodiet and subsistence practices of past populations.

  7. Indicators for functional service life of building structures

    NARCIS (Netherlands)

    Blok, R.; Teuffel, P.

    2014-01-01

    The Estimated Service Life, ESL, is of a major influence in many building assessments. The comparison and optimization of design alternatives depend on the accuracy of this ESL. More and more the Functional Service Life rather than the Technical Service Life is decisive in how long a building can be

  8. 78 FR 2618 - Self-Contained Breathing Apparatus Remaining Service-Life Indicator Performance Requirements

    Science.gov (United States)

    2013-01-14

    ... revises the current standard, employed by the National Institute for Occupational Safety and Health (NIOSH... protection needs of different work operations. This final rule sets a minimum alarm point at 25 percent of...) H. Executive Order 13045 (Protection of Children From Environmental Health Risks and Safety Risks) I...

  9. Reactor coolant pump service life evaluation for current life cycle optimization and license renewal

    International Nuclear Information System (INIS)

    Doroshuk, B.W.; Berto, D.S.; Robles, M.

    1990-01-01

    This paper reports that as part of the plant life cycle management and license renewal program, Baltimore Gas and Electric Company (BG and E) has completed a service life evaluation of their reactor coolant pumps, funded jointly by EPRI and performed by ABB Combustion Engineering Nuclear Power. Two of the goals of the BG and E plant life cycle management and license renewal program, and of this current evaluation, are to identify actions which would optimize current plant operation, and ensure that license renewal remains a viable option. The reactor coolant pumps (RCPs) at BG and E's Calvert Cliffs Units 1 and 2 are Byron Jackson pumps with a diffuser and a single suction. This pump design is also used in many other nuclear plants. The RCP service life evaluation assessed the effect of all plausible age-related degradation mechanisms (ARDMs) on the RCP components. Cyclic fatigue and thermal embrittlement were two ARDMs identified as having a high potential to limit the service life of the pump case. The pump case is a primary pressure boundary component. Hence, ensuring its continued structural integrity is important

  10. Satellite lithium-ion battery remaining useful life estimation with an iterative updated RVM fused with the KF algorithm

    Institute of Scientific and Technical Information of China (English)

    Yuchen SONG; Datong LIU; Yandong HOU; Jinxiang YU; Yu PENG

    2018-01-01

    Lithium-ion batteries have become the third-generation space batteries and are widely utilized in a series of spacecraft. Remaining Useful Life (RUL) estimation is essential to a spacecraft as the battery is a critical part and determines the lifetime and reliability. The Relevance Vector Machine (RVM) is a data-driven algorithm used to estimate a battery's RUL due to its sparse fea-ture and uncertainty management capability. Especially, some of the regressive cases indicate that the RVM can obtain a better short-term prediction performance rather than long-term prediction. As a nonlinear kernel learning algorithm, the coefficient matrix and relevance vectors are fixed once the RVM training is conducted. Moreover, the RVM can be simply influenced by the noise with the training data. Thus, this work proposes an iterative updated approach to improve the long-term prediction performance for a battery's RUL prediction. Firstly, when a new estimator is output by the RVM, the Kalman filter is applied to optimize this estimator with a physical degradation model. Then, this optimized estimator is added into the training set as an on-line sample, the RVM model is re-trained, and the coefficient matrix and relevance vectors can be dynamically adjusted to make next iterative prediction. Experimental results with a commercial battery test data set and a satellite battery data set both indicate that the proposed method can achieve a better per-formance for RUL estimation.

  11. Estimation of Remained defects in a Safety-Critical Software using Bayesian Belief Network of Software Development Life Cycle

    International Nuclear Information System (INIS)

    Lee, Seung Jun; Jung, Wondea Jung

    2015-01-01

    Some researchers recognized Bayesian belief network (BBN) method to be a promising method of quantifying software reliability. Brookhaven National Laboratory (BNL) comprehensively reviewed various quantitative software reliability methods to identify the most promising methods for use in probabilistic safety assessments (PSAs) of digital systems of NPPs against a set of the most desirable characteristics developed therein. BBNs are recognized as a promising way of quantifying software reliability and are useful for integrating many aspects of software engineering and quality assurance. The method explicitly incorporates important factors relevant to reliability, such as the quality of the developer, the development process, problem complexity, testing effort, and the operation environment. In this work, a BBN model was developed to estimate the number of remained defects in a safety-critical software based on the quality evaluation of software development life cycle (SDLC). Even though a number of software reliability evaluation methods exist, none of them can be applicable to the safety-critical software in an NPP because software quality in terms of PDF is required for the PSA

  12. An online method for lithium-ion battery remaining useful life estimation using importance sampling and neural networks

    International Nuclear Information System (INIS)

    Wu, Ji; Zhang, Chenbin; Chen, Zonghai

    2016-01-01

    Highlights: • An online RUL estimation method for lithium-ion battery is proposed. • RUL is described by the difference among battery terminal voltage curves. • A feed forward neural network is employed for RUL estimation. • Importance sampling is utilized to select feed forward neural network inputs. - Abstract: An accurate battery remaining useful life (RUL) estimation can facilitate the design of a reliable battery system as well as the safety and reliability of actual operation. A reasonable definition and an effective prediction algorithm are indispensable for the achievement of an accurate RUL estimation result. In this paper, the analysis of battery terminal voltage curves under different cycle numbers during charge process is utilized for RUL definition. Moreover, the relationship between RUL and charge curve is simulated by feed forward neural network (FFNN) for its simplicity and effectiveness. Considering the nonlinearity of lithium-ion charge curve, importance sampling (IS) is employed for FFNN input selection. Based on these results, an online approach using FFNN and IS is presented to estimate lithium-ion battery RUL in this paper. Experiments and numerical comparisons are conducted to validate the proposed method. The results show that the FFNN with IS is an accurate estimation method for actual operation.

  13. Remaining useful life estimation for deteriorating systems with time-varying operational conditions and condition-specific failure zones

    Directory of Open Access Journals (Sweden)

    Li Qi

    2016-06-01

    Full Text Available Dynamic time-varying operational conditions pose great challenge to the estimation of system remaining useful life (RUL for the deteriorating systems. This paper presents a method based on probabilistic and stochastic approaches to estimate system RUL for periodically monitored degradation processes with dynamic time-varying operational conditions and condition-specific failure zones. The method assumes that the degradation rate is influenced by specific operational condition and moreover, the transition between different operational conditions plays the most important role in affecting the degradation process. These operational conditions are assumed to evolve as a discrete-time Markov chain (DTMC. The failure thresholds are also determined by specific operational conditions and described as different failure zones. The 2008 PHM Conference Challenge Data is utilized to illustrate our method, which contains mass sensory signals related to the degradation process of a commercial turbofan engine. The RUL estimation method using the sensor measurements of a single sensor was first developed, and then multiple vital sensors were selected through a particular optimization procedure in order to increase the prediction accuracy. The effectiveness and advantages of the proposed method are presented in a comparison with existing methods for the same dataset.

  14. Machine remaining useful life prediction: An integrated adaptive neuro-fuzzy and high-order particle filtering approach

    Science.gov (United States)

    Chen, Chaochao; Vachtsevanos, George; Orchard, Marcos E.

    2012-04-01

    Machine prognosis can be considered as the generation of long-term predictions that describe the evolution in time of a fault indicator, with the purpose of estimating the remaining useful life (RUL) of a failing component/subsystem so that timely maintenance can be performed to avoid catastrophic failures. This paper proposes an integrated RUL prediction method using adaptive neuro-fuzzy inference systems (ANFIS) and high-order particle filtering, which forecasts the time evolution of the fault indicator and estimates the probability density function (pdf) of RUL. The ANFIS is trained and integrated in a high-order particle filter as a model describing the fault progression. The high-order particle filter is used to estimate the current state and carry out p-step-ahead predictions via a set of particles. These predictions are used to estimate the RUL pdf. The performance of the proposed method is evaluated via the real-world data from a seeded fault test for a UH-60 helicopter planetary gear plate. The results demonstrate that it outperforms both the conventional ANFIS predictor and the particle-filter-based predictor where the fault growth model is a first-order model that is trained via the ANFIS.

  15. Satellite lithium-ion battery remaining useful life estimation with an iterative updated RVM fused with the KF algorithm

    Directory of Open Access Journals (Sweden)

    Yuchen SONG

    2018-01-01

    Full Text Available Lithium-ion batteries have become the third-generation space batteries and are widely utilized in a series of spacecraft. Remaining Useful Life (RUL estimation is essential to a spacecraft as the battery is a critical part and determines the lifetime and reliability. The Relevance Vector Machine (RVM is a data-driven algorithm used to estimate a battery’s RUL due to its sparse feature and uncertainty management capability. Especially, some of the regressive cases indicate that the RVM can obtain a better short-term prediction performance rather than long-term prediction. As a nonlinear kernel learning algorithm, the coefficient matrix and relevance vectors are fixed once the RVM training is conducted. Moreover, the RVM can be simply influenced by the noise with the training data. Thus, this work proposes an iterative updated approach to improve the long-term prediction performance for a battery’s RUL prediction. Firstly, when a new estimator is output by the RVM, the Kalman filter is applied to optimize this estimator with a physical degradation model. Then, this optimized estimator is added into the training set as an on-line sample, the RVM model is re-trained, and the coefficient matrix and relevance vectors can be dynamically adjusted to make next iterative prediction. Experimental results with a commercial battery test data set and a satellite battery data set both indicate that the proposed method can achieve a better performance for RUL estimation.

  16. Novel Approach for Lithium-Ion Battery On-Line Remaining Useful Life Prediction Based on Permutation Entropy

    Directory of Open Access Journals (Sweden)

    Luping Chen

    2018-04-01

    Full Text Available The degradation of lithium-ion battery often leads to electrical system failure. Battery remaining useful life (RUL prediction can effectively prevent this failure. Battery capacity is usually utilized as health indicator (HI for RUL prediction. However, battery capacity is often estimated on-line and it is difficult to be obtained by monitoring on-line parameters. Therefore, there is a great need to find a simple and on-line prediction method to solve this issue. In this paper, as a novel HI, permutation entropy (PE is extracted from the discharge voltage curve for analyzing battery degradation. Then the similarity between PE and battery capacity are judged by Pearson and Spearman correlation analyses. Experiment results illustrate the effectiveness and excellent similar performance of the novel HI for battery fading indication. Furthermore, we propose a hybrid approach combining Variational mode decomposition (VMD denoising technique, autoregressive integrated moving average (ARIMA, and GM(1,1 models for RUL prediction. Experiment results illustrate the accuracy of the proposed approach for lithium-ion battery on-line RUL prediction.

  17. Solid Propulsion Systems, Subsystems, and Components Service Life Extension

    Science.gov (United States)

    Hundley, Nedra H.; Jones, Connor

    2011-01-01

    The service life extension of solid propulsion systems, subsystems, and components will be discussed based on the service life extension of the Space Transportation System Reusable Solid Rocket Motor (RSRM) and Booster Separation Motors (BSM). The RSRM is certified for an age life of five years. In the aftermath of the Columbia accident there were a number of motors that were approaching the end of their five year service life certification. The RSRM Project initiated an assessment to determine if the service life of these motors could be extended. With the advent of the Constellation Program, a flight test was proposed that would utilize one of the RSRMs which had been returned from the launch site due to the expiration of its five year service life certification and twelve surplus Chemical Systems Division BSMs which had exceeded their eight year service life. The RSRM age life tracking philosophy which establishes when the clock starts for age life tracking will be described. The role of the following activities in service life extension will be discussed: subscale testing, accelerated aging, dissecting full scale aged hardware, static testing full scale aged motors, data mining industry data, and using the fleet leader approach. The service life certification and extension of the BSMs will also be presented.

  18. Measuring service life and evaluating the quality of solid tires

    Directory of Open Access Journals (Sweden)

    Charoenyut Dechwayukul

    2010-08-01

    Full Text Available The objective of this research is to propose procedures for measuring service life and evaluating the quality of locallymade and used solid tires in Thailand. The solid tires were stressed and rotated until blowout on a drum-like test apparatuswhich is designed, constructed by the authors and equipped with laboratory instrumentation. Solid tires from five differentmanufacturers were selected for testing. We measured service life, length of time to tire failure, at three different loadingamplitudes and three different speeds on the testing drum. The service life of all specimens was studied and compared todetermine the possibility of using service life to evaluate the quality of a solid tire.

  19. A proposal of predictive methods of crack propagation life and remaining life of structural metal under creep-fatigue interacted conditions by use of X-ray profile analysis

    International Nuclear Information System (INIS)

    Ohnami, M.; Sakane, M.; Nishino, S.

    1987-01-01

    The following two series of studies are described: One is crack propagation life prediction in high-temperature low-cycle fatigue tests under triangular and trapezoidal strain or stress waves for austenitic stainless steel by X-ray fractography. Another is remaining life prediction of the steel under creep-fatigue interacted conditions by applying the concept of the remaining life diagram and X-ray profile analysis. Particle size and microstrain obtained by X-ray profile analysis were effective nondestructive parameters for estimating crack propagation life and remaining life in creep-fatigue interaction

  20. Child, Caregiver, and Family Characteristics Associated with Emergency Department Use by Children Who Remain at Home after a Child Protective Services Investigation

    Science.gov (United States)

    Schneiderman, Janet U.; Hurlburt, Michael S.; Leslie, Laurel K.; Zhang, Jinjin; Horwitz, Sarah McCue

    2012-01-01

    Objectives: To examine emergency department (ED) use among children involved with child protective services (CPS) in the US but who remain at home, and to determine if ED use is related to child, caregiver and family characteristics as well as receipt of CPS services. Method: We analyzed data on 4,001 children in the National Survey of Child and…

  1. Elderly with remaining teeth report less frailty and better quality of life than edentulous elderly : a cross-sectional study

    NARCIS (Netherlands)

    Hoeksema, A. R.; Spoorenberg, S. L. W.; Peters, L. L.; Meijer, H. J. A.; Raghoebar, G. M.; Vissink, A.; Wynia, K.; Visser, A.

    ObjectiveTo assess oral status and self-reported oral health in community-living elderly and to determine differences between relevant subgroups of oral status (remaining teeth, edentulous, implant-retained overdentures) and case complexity (robust, frail, complex care needs). Subjects and methodsIn

  2. Is the motivation to become a teacher related to pre-service teachers' intentions to remain in the profession?

    NARCIS (Netherlands)

    Bruinsma, Marjon; Jansen, Ellen P. W. A.

    2010-01-01

    This study investigated 198 pre-service teachers' intrinsic and extrinsic motivation for becoming teachers and focused on the distinction between adaptive motives, which promote lasting and effective engagement, and maladaptive motives, which promote superficial engagement. We examined the

  3. End-of-Life Inventory Decisions of Service Parts

    NARCIS (Netherlands)

    M. Pourakbar (Morteza)

    2011-01-01

    textabstractWith the spurt of technology and innovation the life cycles of parts and products have become shorter and service parts enter their final phases earlier. Final phase of a typical service part starts once the part production is ceased and ends when the last service or warranty contract

  4. Simulation of Microdamage and Evaluation of Remaining Life of Steam Conduit Components from New-Generation Refractory Steel 10Kh9MF-Sh

    Science.gov (United States)

    Gladshtein, V. I.

    2018-03-01

    The effects of microdamage on the remaining life of high-temperature components of steam conduits from high-chromium steel 10Kh9MF-Sh and low-alloy steel 12Kh1M1F are compared. To simulate the microdamage, specimens with a circular notch and different relative diameters are fabricated. Specimens with a notch simulating the highest degree of microdamage and smooth specimens are tested for long-term strength. The coefficient of the remaining life of a conduit is computed for the range of relative damage presenting practical interest.

  5. Influence of service life on Life Cycle Assessments

    NARCIS (Netherlands)

    van Nunen, H.; Hendriks, N.A.; Erkelens, P.A.

    2003-01-01

    Environmental assessment is part of present decision making. But, because of difficulties the assessments are not as profound as could be. Life Cycle Assessment (LCA) is a cradle-to-grave approach and consequently a time factor is embedded. Until now this time factor is fixed and calculations are

  6. A new time-series methodology for estimating relationships between elderly frailty, remaining life expectancy, and ambient air quality.

    Science.gov (United States)

    Murray, Christian J; Lipfert, Frederick W

    2012-01-01

    Many publications estimate short-term air pollution-mortality risks, but few estimate the associated changes in life-expectancies. We present a new methodology for analyzing time series of health effects, in which prior frailty is assumed to precede short-term elderly nontraumatic mortality. The model is based on a subpopulation of frail individuals whose entries and exits (deaths) are functions of daily and lagged environmental conditions: ambient temperature/season, airborne particles, and ozone. This frail susceptible population is unknown; its fluctuations cannot be observed but are estimated using maximum-likelihood methods with the Kalman filter. We used an existing 14-y set of daily data to illustrate the model and then tested the assumption of prior frailty with a new generalized model that estimates the portion of the daily death count allocated to nonfrail individuals. In this demonstration dataset, new entries into the high-risk pool are associated with lower ambient temperatures and higher concentrations of particulate matter and ozone. Accounting for these effects on antecedent frailty reduces this at-risk population, yielding frail life expectancies of 5-7 days. Associations between environmental factors and entries to the at-risk pool are about twice as strong as for mortality. Nonfrail elderly deaths are seen to make only small contributions. This new model predicts a small short-lived frail population-at-risk that is stable over a wide range of environmental conditions. The predicted effects of pollution on new entries and deaths are robust and consistent with conventional morbidity/mortality times-series studies. We recommend model verification using other suitable datasets.

  7. Interdependence of life insurance service quality and premium

    Directory of Open Access Journals (Sweden)

    Dragan Benazić

    2006-12-01

    Full Text Available Insurance companies in Croatia feel the need to find new sources of competitive advantage on the Croatian life insurance market amid increasing competition and a poorly profiled offer of life insurance services. Lately, both marketing literature and practice seem to point to the shaping of a relationship between service quality and price as a possible solution to improving the position of insurance companies on the Croatian market. In providing life insurance services, the insurance companies should focus on the quality elements that offer certain benefits a client is willing to pay for. Changes in individual quality features have been evaluated differently by clients. Such differences in their evaluation of changes in the individual elements of service quality also reflect the willingness of clients to pay a suitable increase on their insurance premium. Improvements in the service quality features that are subjectively evaluated as important should lead to the client’s acceptance of a higher life insurance premium. The paper considers the interdependence between the quality of life insurance services and the premium from the aspect of the client’s willingness to pay a higher life insurance premium for a higher service quality.

  8. Through-life engineering services motivation, theory, and practice

    CERN Document Server

    Roy, Rajkumar

    2015-01-01

    Demonstrating the latest research and analysis in the area of through-life engineering services (TES), this book utilizes case studies and expert analysis from an international array of practitioners and researchers – who together represent multiple manufacturing sectors: aerospace, railway and automotive – to maximize reader insights into the field of through-life engineering services. As part of the EPSRC Centre in Through-life Engineering Services program to support the academic and industrial community, this book presents an overview of non-destructive testing techniques and applications and provides the reader with the information needed to assess degradation and possible automation of through-life engineering service activities . The latest developments in maintenance-repair-overhaul (MRO) are presented with emphasis on cleaning technologies, repair and overhaul approaches and planning and digital assistance. The impact of these technologies on sustainable enterprises is also analyzed. This book wil...

  9. Flexible pavement rehabilitation design based on pavement service life time span left

    OpenAIRE

    Gamelyak, I.; Shevchuk, V.

    2005-01-01

    The design of flexible pavement rehabilitation is analysed in terms of durability-cost. A notion of the remaining service life span is described. the model of rehabilitation strategy selection is presented for both design project and operation stages. the results can be used in the pavement management system.

  10. Effect of corrosion on the fatigue service-life on steel and reinforced concrete beams

    NARCIS (Netherlands)

    Veerman, R.P.; van Breugel, K.; Koenders, E.A.B.

    2015-01-01

    Chloride-induced corrosion is a point of big concern in reinforced concrete (RC) structures. To monitor the actual health and to predict the remaining service-life of structures, it is important to understand the structural behaviour and the failure mechanism of structures exposed to chlorides under

  11. The Service Life Evaluation for Concrete Structure of NPP

    International Nuclear Information System (INIS)

    Lee, Choon Min; Kim, Seong Soo; Bae, Sung Hwan; Sik, Yoon Eui

    2014-01-01

    Prolonged exposure to the marine environment degrades the durability of concrete and shortens the service life of concrete due to degradation factors such as chloride, carbonation, freezing and thawing, sulfate. Therefore, many country's organizations like the Korea Concrete Institute (KCI), the American Concrete Institute (ACI), the International Federation for Structural Concrete (FIB), the American Society for Testing and Material (ASTM) which recognized the seriousness of this deterioration proposed equation models to evaluate the service life for the concrete structures. As a result, this paper is to especially consider the service life evaluation using these equation models for concrete structure of NPP in Korea compared with 60 years as a design service life. The concrete durability evaluation for Shin-Hanul NPP units 1 and 2 is carried out by using typically proposed assessment models in domestic and foreign standard. It is confirmed that the service life of concrete durability for each of deterioration factors is significantly higher than 60 years as a design service life. As a result, the study of combined deterioration for the concrete structures of NPP in future is positively necessary and maintenance control through regular monitoring should be conducted to secure safety margin basis

  12. Student-Life Stress in Education and Health Service Majors

    Science.gov (United States)

    Zascavage, Victoria; Winterman, Kathleen G.; Buot, Max; Wies, Jennifer R.; Lyzinski, Natalie

    2012-01-01

    In order to better understand the effects of student-life stress on Education and Health Service majors (n = 195) at a private, religious, Midwestern university in the USA, we assessed student perception of overall stress level and physical stress level using the Student-life Stress Inventory. The targeted sample consisted of students with…

  13. Service life and sustainable design methods: a case study

    CSIR Research Space (South Africa)

    Mc Duling, J

    2008-05-01

    Full Text Available The design life of hospitals normally varies between 50 to 60 years. This paper presents a case study of a major academic hospital that reached the end of its service life only 30 years after commissioning due to a combination of unsustainable...

  14. Life cycle management of service water systems

    International Nuclear Information System (INIS)

    Egan, Geoffrey R.; Besuner, Philip M.; Mahajan, Sat P.

    2004-01-01

    As nuclear plants age, more attention must focus on age and time dependent degradation mechanisms such as corrosion, erosion, fatigue, etc. These degradation mechanisms can best be managed by developing a life cycle management plan which integrates past historical data, current conditions and future performance needs. In this paper we present two examples of life cycle management. In the first example, the 20-year maintenance history of a sea water cooling system (cement-lined, cast iron) is reviewed to develop attributes like maintenance cost, spare part inventory, corrosion, and repair data. Based on this information, the future expected damage rate was forecast. The cost of managing the future damage was compared with the cost to replace (in kind and with upgraded materials. A decision optimization scheme was developed to choose the least cost option from: a) Run as-is and repair; b) replace in kind; or c) replace with upgraded material and better design. In the second example, life cycle management techniques were developed for a ceilcote lined steel pipe cooling water system. Screens (fixed and traveling), filters, pumps, motors, valves, and piping were evaluated. (author)

  15. A New Predictive Model Based on the ABC Optimized Multivariate Adaptive Regression Splines Approach for Predicting the Remaining Useful Life in Aircraft Engines

    Directory of Open Access Journals (Sweden)

    Paulino José García Nieto

    2016-05-01

    Full Text Available Remaining useful life (RUL estimation is considered as one of the most central points in the prognostics and health management (PHM. The present paper describes a nonlinear hybrid ABC–MARS-based model for the prediction of the remaining useful life of aircraft engines. Indeed, it is well-known that an accurate RUL estimation allows failure prevention in a more controllable way so that the effective maintenance can be carried out in appropriate time to correct impending faults. The proposed hybrid model combines multivariate adaptive regression splines (MARS, which have been successfully adopted for regression problems, with the artificial bee colony (ABC technique. This optimization technique involves parameter setting in the MARS training procedure, which significantly influences the regression accuracy. However, its use in reliability applications has not yet been widely explored. Bearing this in mind, remaining useful life values have been predicted here by using the hybrid ABC–MARS-based model from the remaining measured parameters (input variables for aircraft engines with success. A correlation coefficient equal to 0.92 was obtained when this hybrid ABC–MARS-based model was applied to experimental data. The agreement of this model with experimental data confirmed its good performance. The main advantage of this predictive model is that it does not require information about the previous operation states of the aircraft engine.

  16. Extending the Service Life of Pavements

    Science.gov (United States)

    Gschwendt, Ivan

    2018-03-01

    The cost of road construction and expenditures on the maintenance of pavements, i.e., their whole life cost, represents a lot of money. The paper describes a procedure for a pavement management system with degradation models and estimates the length of time for the rehabilitation of an asphalt pavement. Using a theory of pavement mechanics, we calculated the stresses and strains on the layers of two pavement models. High modulus asphalt concrete, an asphalt mix with a high binder content, and an asphalt mix with binder modifications are new road building materials. Prolonging the time for the rehabilitation of pavements is possible.

  17. Forecasts on service life by fracture mechanics methods

    International Nuclear Information System (INIS)

    Munz, D.

    1985-01-01

    The service life of many component parts can frequently be divided into the stages up to the formation of a crack and of crack propagation. This holds good of fatigue crack, stress corrosion crack, and also in many cases of creep. But often the crack propagation stage is the only one of interest for service life forecasts if cracks must be reckoned with already on putting parts into service. Cracks in welding constructions are typical examples. Crack- and -fracture mechanics deal with the laws underlying crack propagation and provide quantitative information on crack propagation behaviour. (orig./DG) [de

  18. Quality of services and quality of life from service providers' perspectives: analysis with focus groups.

    Science.gov (United States)

    Jenaro, C; Vega, V; Flores, N; Cruz, M

    2013-06-01

    Concepts such as support, quality of life and quality of services are customary in services for people with intellectual disabilities. The identification of the different ways of conceiving, prioritising and implementing these concepts by service providers can help to drive changes to achieve better personal outcomes for this population. The current study aims to identify service providers' perceptions regarding the quality of life of their clients and the quality of services they provide. It also aims to identify similarities and differences of appraisals among professionals, and to identify associations between supports, quality of life and quality of services. Data were collected from 22 service providers who attended three focus groups (professionals, direct support staff, and managers) from whom 424 comments were analysed. Service providers were asked about the required support for users, the meaning of quality of life for those users, and about features that should characterise quality services. Thematic analysis was employed and transcripts of the sessions were coded according to the dimensions of models on supports, quality of life and quality of services. Chi-squared tests were utilised to test for potential differences among groups. Each professional group has its own priorities concerning required supports. Among the organisation different and potentially conflicting perceptions regarding the meaning of experiencing quality of life coexist. Concerning quality of services, only managers mentioned personal outcomes. Finally, institutionalisation has a negative impact on supports, quality of life and quality of services. It is necessary to move beyond a shared awareness of the negative impact of institutionalisation towards the transformation of services in search of personal quality outcomes. © 2012 The Authors. Journal of Intellectual Disability Research © 2012 John Wiley & Sons Ltd, MENCAP & IASSID.

  19. Quality of Services and Quality of Life from Service Providers' Perspectives: Analysis with Focus Groups

    Science.gov (United States)

    Jenaro, C.; Vega, V.; Flores, N.; Cruz, M.

    2013-01-01

    Background: Concepts such as support, quality of life and quality of services are customary in services for people with intellectual disabilities. The identification of the different ways of conceiving, prioritising and implementing these concepts by service providers can help to drive changes to achieve better personal outcomes for this…

  20. Hybrid PSO–SVM-based method for forecasting of the remaining useful life for aircraft engines and evaluation of its reliability

    International Nuclear Information System (INIS)

    García Nieto, P.J.; García-Gonzalo, E.; Sánchez Lasheras, F.; Cos Juez, F.J. de

    2015-01-01

    The present paper describes a hybrid PSO–SVM-based model for the prediction of the remaining useful life of aircraft engines. The proposed hybrid model combines support vector machines (SVMs), which have been successfully adopted for regression problems, with the particle swarm optimization (PSO) technique. This optimization technique involves kernel parameter setting in the SVM training procedure, which significantly influences the regression accuracy. However, its use in reliability applications has not been yet widely explored. Bearing this in mind, remaining useful life values have been predicted here by using the hybrid PSO–SVM-based model from the remaining measured parameters (input variables) for aircraft engines with success. A coefficient of determination equal to 0.9034 was obtained when this hybrid PSO–RBF–SVM-based model was applied to experimental data. The agreement of this model with experimental data confirmed its good performance. One of the main advantages of this predictive model is that it does not require information about the previous operation states of the engine. Finally, the main conclusions of this study are exposed. - Highlights: • A hybrid PSO–SVM-based model is built as a predictive model of the RUL values for aircraft engines. • The remaining physical–chemical variables in this process are studied in depth. • The obtained regression accuracy of our method is about 95%. • The results show that PSO–SVM-based model can assist in the diagnosis of the RUL values with accuracy

  1. Service life prediction and fibre reinforced cementitious composites

    DEFF Research Database (Denmark)

    Stoklund Larsen, E.

    The present Ph.D.thesis addresses the service life concept on the fibre reinforced cementitious composites. The advantages and problems of adding fibre to a cementitious matrix and the influence on service life are described. In SBI Report 221, Service life prediction and cementitious somposites......, the factors affecting the pure cementitious composite are described. Different sizes and types of fibre reinforced crmentitious composites have been chosen to illustrate different ageing and deterioration mechanisms. Some ageing mechanisms can be accelerated and others cannot which is demonstrated in a test...... programme. Moisture, micro structural and mechanical properties were measured before, during and after ageing, with the purpose of giving a detailed "picture" of the materials during ageing....

  2. Service life prediction of exterior plastics vision for the future

    CERN Document Server

    Martin, Jon; Chapin, J

    2015-01-01

    This book defines the current state-of-the-art for predicting the lifetime of plastics exposed to weather and outlines future research needed to advance this important field of study. Coverage includes progress in developing new science and test methods to determine how materials respond to weather exposure. This book is ideal for researchers and professionals working in the field of service life prediction. This book also: Examines numerous consensus standards that affect commercial products allowing readers to see the future of standards related to service life prediction Provides the scientific foundation for the latest commercially viable instruments Presents groundbreaking research, including the blueprint of a new test method that will significantly shorten the service life prediction process time Covers two of the latest verified predictive models, which demonstrate realized-potential to transform the field

  3. Reinforcement Corrosion: Numerical Simulation and Service Life Prediction

    DEFF Research Database (Denmark)

    Michel, Alexander

    defects and b) define the end of service life once reinforcement corrosion is initiated neglecting corrosion processes during the propagation stage. The goal of this work was to develop a framework for the service life prediction of reinforced concrete covering initiation and propagation of chloride......Modelling of deterioration processes in concrete structures plays an increasing role in the design of reinforced concrete structures. Large sums are spent every year to ensure the durability of concrete structures, especially towards reinforcement corrosion. Improved durability provides increased...... structural reliability, economical improvements in form of less need for maintenance and repair as well as increased sustainability due to an increased energy and resource efficiency. Several service life prediction models dealing with reinforcement corrosion in concrete structurescan be found...

  4. Analytical evaluation of the roller bearing service life

    Directory of Open Access Journals (Sweden)

    Antsupov Aleksey

    2017-01-01

    Full Text Available An analytical method has been developed for the design evaluation of the service life of roller bearings by the criterion of contact endurance of elements that does not require carrying out the experimental studies. It is based on the kinetic approach to the description of the solids destruction process and the theory of parametric reliability of machine parts. In contradistinction to the standard empirical dependence, which is currently used, the method allows one to take into account the effect of the material properties, and basic design and operational parameters on the service life. The results of the theoretical studies of the service life of roller bearing No. 212 (DIN 5412 T1 are presented for the quantitative assessment of this effect. They showed that the temperature-force loading conditions or material properties that were not taken into account might result in the prediction error of 1.5 or more times.

  5. ALIAS an innovative intranet-system for the remaining life analysis of systems and components; ALIAS - ein innovatives Intranet-System zur Restlebensdaueranalyse von Systemen und Bauteilen

    Energy Technology Data Exchange (ETDEWEB)

    Jovanovic, A S; Schweikhard, T [Stuttgart Univ. (Germany). Staatliche Materialpruefungsanstalt; Balos, D [Stuttgart Univ. (Germany). Staatliche Materialpruefungsanstalt; [Grosskraftwerk Mannheim AG (Germany)

    1998-11-01

    The paper describes an innovative and advanced system for remaining life assessment of industrial high-temperature components developed at MPA Stuttgart, Germany and being currently introduced into the power plants in Germany and in several other countries. The system is a corporate memory system, essentially meaning that all the information/knowledge of a corporation (company, institute, etc.) should be maximally exploited in future activities of the company, with minimum changes in the existing structure of the data/information/knowledge already available. The system has two main aspects of practical implementation: (a) the organizational one, represented by MPA LifeTech, and (b) the software system one represented by the ``parent systems`` WISDOM and (WISDOM - WWW-based Intelligent System for Data and Documentation Management, ALIAS - The Advanced modular intelligent Life Assessment Software System). (orig.) [Deutsch] Das Papier beschreibt ein innovatives und fortschrittliches Softwaresystem, das an der MPA Stuttgart entwickelt wurde und bei mehreren europaeischen und deutschen Kraftwerksbetreibern eingefuehrt wird. Das Konzept beruht auf der Idee von s.g. corporate memory systems mit der Zielsetzung, die gesamte Bandbreite an Informationen und Wissen eines Unternehmens (Firma, Institution usw.) fuer dessen zukuenftige Aktivitaeten optimal zu nutzen. Die bestehende Struktur der bereits vorhandenen Daten sollte dabei nur geringfuegig geaendert werden muessen. Zur praktischen Durchfuehrung des Konzepts sind zwei Aspekte von Bedeutung: die Organisation (MPA LifeTech) und das Softwaresystem bzw. Systeme WISDOM und ALIAS (WISDOM - WWW-based Intelligent System for Data and Documentation Management, ALIAS - The Advanced modular Intelligent Life Assessment Software System). (orig.)

  6. Calculating the price of tanks, vessels and process equipment of petrochemical industry second criteria of integrity and survival remaining of API RP 579 (Fitness for service); Calculo do preco de tanques, vasos e equipamentos de processo da industria petroquimica segundo criterios de integridade e sobrevida remanescente do API RP 579 (Fitness for service)

    Energy Technology Data Exchange (ETDEWEB)

    Morato, Paulo Cesar Vidal Morato [Petroleo Brasileiro S.A. (PETROBRAS), Rio de Janeiro, RJ (Brazil)

    2012-07-01

    By owning many tanks, vessels and process equipment, PETROBRAS has developed the concept of 'Fitness-For-Service' (suitability for use) under the standard API RP 579, i.e. to verify the structural integrity and remaining useful life of equipment in service. In this paper we will discuss how to calculate the remaining useful life of equipment used in accordance with such criteria and with this technical data, calculate the depreciated price. Steps: verification of applicability; surveys of the technical data of the equipment; surveys the minimum thickness of plating equipment over the years; calculation of the average annual rate of corrosion (tc); calculation of the required minimum thickness according to the criteria of API RP 579 (tr); calculation of remaining useful life (nr); calculation of the depreciated price (Vd) equipment. Conclusions: intended for evaluation of tanks price, vessels and process equipment according to API RP 579 concepts. Estimate the remaining useful life of equipment used and calculates the depreciated price. Scientific method based, consistent and robust, due to calculating established the remaining useful life. (author)

  7. Experience of childhood abuse and later number of remaining teeth in older Japanese: a life-course study from Japan Gerontological Evaluation Study project.

    Science.gov (United States)

    Matsuyama, Yusuke; Fujiwara, Takeo; Aida, Jun; Watt, Richard G; Kondo, Naoki; Yamamoto, Tatsuo; Kondo, Katsunori; Osaka, Ken

    2016-12-01

    From a life-course perspective, adverse childhood experiences (ACEs) such as childhood abuse are known risk factors for adult diseases and death throughout life. ACEs could also cause poor dental health in later life because they could induce poor dental health in childhood, initiate unhealthy behaviors, and lower immune and physiological functions. However, it is not known whether ACEs have a longitudinal adverse effect on dental health in older age. This study aimed to investigate the association between experience of childhood abuse until the age of 18 and current number of remaining teeth among a sample of older Japanese adults. A retrospective cohort study was conducted using the data from the Japan Gerontological Evaluation Study (JAGES), a large-scale, self-reported survey in 2013 including 27 525 community-dwelling Japanese aged ≥65 years (response rate=71.1%). The outcome, current number of remaining teeth was used categorically: ≥20, 10-19, 5-9, 1-4, and no teeth. Childhood abuse was defined as having any experience of physical abuse, psychological abuse, and psychological neglect up until the age of 18 years. Ordered logistic regression models were applied. Of the 25 189 respondents who indicated their number of remaining teeth (mean age: 73.9; male: 46.5%), 14.8% had experience of childhood abuse. Distributions of ≥20, 10-19, 5-9, 1-4, and no teeth were as follows: 46.6%, 22.0%, 11.4%, 8.2%, and 11.8% among respondents with childhood abuse, while 52.3%, 21.3%, 10.3%, 6.6%, and 9.5% among respondents without childhood abuse. Childhood abuse was significantly associated with fewer remaining teeth after adjusting for covariates including socioeconomic status (odds ratio=1.14; 95% confidence interval: 1.06, 1.22). Childhood abuse could have a longitudinal adverse effect on later dental health in older age. This study emphasizes the importance of early life experiences on dental health throughout later life. © 2016 John Wiley & Sons A/S. Published by

  8. Service Life and Maintenance Modelling of Reinforced Concrete Bridge Decks

    DEFF Research Database (Denmark)

    Thoft-Christensen, Palle

    Recent research in the area of assessment and maintenance of reinforced concrete bridge decks is presented in this paper. Three definitions of service lifetime are introduced and the difficult problem of assessing the service life is discussed. A stochastic modelling of corrosion and corrosion...... cracking is introduced and the site dependency of corrosion is stressed. Finally, a recently developed optimal repair strategy for bridges is briefly explained....

  9. Approaches for Modelling the Residual Service Life of Marine Concrete Structures

    Directory of Open Access Journals (Sweden)

    Amir Rahimi

    2014-01-01

    Full Text Available This paper deals with the service life design of existing reinforced concrete structures in a marine environment. The general procedure of condition assessment for estimating the residual service life of structures before a repair measure is illustrated. For assessment of the residual service life of structures which have undergone a repair measure a simplified mathematical model of chloride diffusion in a 2-layer system is presented. Preliminary probabilistic calculations demonstrate the effect of various conditions on the residual service life. First studies of the chloride diffusion in a 2-layer system have been conducted using the finite element method. Results of a long-term exposure test are presented to illustrate the performance of two different repair materials. The distribution of residual chlorides after application of a repair material is being studied in laboratory investigations. The residual chlorides migrate from the concrete layer into the new layer immediately after the repair material has been applied to the concrete member. The content and gradient of residual chlorides, along with the thickness and the chloride ingress resistance of both the remaining and the new layer of cover, will determine the residual service life of the repaired structures.

  10. Relationship Between the Remaining Years of Healthy Life Expectancy in Older Age and National Income Level, Educational Attainment, and Improved Water Quality.

    Science.gov (United States)

    Kim, Jong In; Kim, Gukbin

    2016-10-01

    The remaining years of healthy life expectancy (RYH) at age 65 years can be calculated as RYH (65) = healthy life expectancy-aged 65 years. This study confirms the associations between socioeconomic indicators and the RYH (65) in 148 countries. The RYH data were obtained from the World Health Organization. Significant positive correlations between RYH (65) in men and women and the socioeconomic indicators national income, education level, and improved drinking water were found. Finally, the predictors of RYH (65) in men and women were used to build a model of the RYH using higher socioeconomic indicators (R(2 )= 0.744, p educational attainment, national income level, and improved water quality influenced the RYH at 65 years. Therefore, policymaking to improve these country-level socioeconomic factors is expected to have latent effects on RYH in older age. © The Author(s) 2016.

  11. Serviceability modeling : predicting and extending the useful service life of FRT-plywood roof sheathing

    Science.gov (United States)

    Jerrold E. Winandy

    2000-01-01

    One of the most, if not the most, efficient methods of extending our existing forest resource is to prolong the service life of wood currently in-service by using those existing structures to meet our future needs (Hamilton and Winandy 1998). It is currently estimated that over 7 x 109 m3 (3 trillion bd. ft) of wood is currently in service within the United States of...

  12. Life Cycle Characteristics of Small Professional Service Firms

    NARCIS (Netherlands)

    Masurel, E.; van Montfort, C.A.G.M.

    2006-01-01

    Our study of professional services firms clearly revealed that firms change over the course of their life cycles. During the first three stages, diversification in sales, the differentiation in labor force, and the level of labor productivity increase. In the last stage, diversification in sales,

  13. Pre-Service Teachers in Second Life: Potentials of Simulations

    Science.gov (United States)

    Teoh, Jase

    2012-01-01

    An in-depth qualitative study with nine secondary pre-service teachers from an undergraduate "Language and Literacy" class was conducted to examine the potential of simulation using Second Life (SL) in teacher education. Games and simulations were operationally defined in the broadest sense to distinguish key characteristics between…

  14. Threats Management Throughout the Software Service Life-Cycle

    Directory of Open Access Journals (Sweden)

    Erlend Andreas Gjære

    2014-04-01

    Full Text Available Software services are inevitably exposed to a fluctuating threat picture. Unfortunately, not all threats can be handled only with preventive measures during design and development, but also require adaptive mitigations at runtime. In this paper we describe an approach where we model composite services and threats together, which allows us to create preventive measures at design-time. At runtime, our specification also allows the service runtime environment (SRE to receive alerts about active threats that we have not handled, and react to these automatically through adaptation of the composite service. A goal-oriented security requirements modelling tool is used to model business-level threats and analyse how they may impact goals. A process flow modelling tool, utilising Business Process Model and Notation (BPMN and standard error boundary events, allows us to define how threats should be responded to during service execution on a technical level. Throughout the software life-cycle, we maintain threats in a centralised threat repository. Re-use of these threats extends further into monitoring alerts being distributed through a cloud-based messaging service. To demonstrate our approach in practice, we have developed a proof-of-concept service for the Air Traffic Management (ATM domain. In addition to the design-time activities, we show how this composite service duly adapts itself when a service component is exposed to a threat at runtime.

  15. Navigating the risks of prevention of mother to child transmission (PMTCT) of HIV services in Kibera, Kenya: Barriers to engaging and remaining in care.

    Science.gov (United States)

    Thomson, Kerry A; Telfer, Barbara; Opondo Awiti, Patricia; Munge, Jane; Ngunga, Mathew; Reid, Anthony

    2018-01-01

    Within the first year of implementation, 43% of women who tested HIV positive at their first antenatal care visit were no longer retained and being followed in the free prevention of mother to child transmission (PMTCT) of HIV program offered by the Kenyan Ministry of Health and Médecins Sans Frontières in the informal settlement of Kibera, Nairobi. This study aimed to explore barriers to enrolling and remaining engaged in PMTCT services throughout the pregnancy and postpartum periods. Qualitative data from 31 focus group discussions and 35 in-depth interviews across six stakeholder groups that included women, men, and PMTCT service providers were analyzed. Using an inductive exploratory approach, four researchers coded the data and identified key themes. Five themes emerged from the data that may influence attrition from PMTCT service in this setting: 1) HIV in the context of Kibera, 2) knowledge of HIV status, 3) knowledge of PMTCT, 4) disclosure of HIV status, and 5) male partner support for PMTCT services. A new HIV diagnosis during pregnancy immediately triggered an ongoing risk assessment of perceived hazards in the home, community, and clinic environments that could occur as a result of female participation in PMTCT services. Male partners were a major influence in this risk assessment, but were generally unaware of PMTCT services. To preserve relationships with male partners, meet community expectations of womanhood, and maintain confidentiality while following recommendations of healthcare providers, women had to continuously weigh the risks and benefits of PMTCT services and interventions. Community-based HIV testing and PMTCT education, male involvement in antenatal care, and counseling customized to assist each woman in her own unique risk assessment, may improve uptake of and retention in care and optimize the HIV prevention benefit of PMTCT interventions.

  16. A Liquid work-life under public service contracting

    DEFF Research Database (Denmark)

    Lindholst, Christian

    for staff, however, are only poorly understood in current theory and research on public service contracting through partial concepts and a tendency to focus merely on negative outcomes. Against this shortfall, the aim in this paper is to build a conceptually and empirically richer and more authentic account......A part of the reality behind public service contracting in Denmark as well as in many other countries is that a growing number of people are employed in uncertain and temporary conditions and relations in what can be characterized as ‘liquidized’ work-lives. This reality and its consequences...... of staffs’ work-life under public service contracting. The paper relies empirically on focus group interviews in two cases of staff transfers in public service contracting with different levels of liquefaction. it is found that staff transfer is a composite experience for staff with differential outcomes...

  17. Risk based service life prediction of underground cast iron pipes subjected to corrosion

    International Nuclear Information System (INIS)

    Li, C.Q.; Mahmoodian, M.

    2013-01-01

    Aging and deterioration of underground cast iron pipes is inevitable after their long time in service, with corrosion being the most predominant mechanism for pipe failures. Although considerable research has been undertaken in the past few decades, more is on the effects of corrosion on structural capacity of pipes than that on the prediction of their service life. This paper presents a methodology to quantitatively assess the risk of pipe collapse and predict its remaining service life using a time-dependent reliability theory. The concept of stress intensity in fracture mechanics is employed to establish the failure criterion of pipe collapse. An empirical model is derived for maximum pit growth of corrosion from the available data based on mathematical regressions. An example is provided to illustrate the application of the proposed method. It is found in the paper that the risk of pipe collapse increases with an increase in the diameter of the pipe for both external and internal corrosion. It is also found that the tougher the pipe is, the smaller the risk of its collapse. The paper concludes that a time-dependent reliability method is a very useful tool to predict the risk of pipe collapse and its remaining service life. The proposed method can help the water industry develop rehabilitation or replacement strategy for existing pipe networks with a view for better management of the pipe asset

  18. Computational Everyday Life Human Behavior Model as Servicable Knowledge

    Science.gov (United States)

    Motomura, Yoichi; Nishida, Yoshifumi

    A project called `Open life matrix' is not only a research activity but also real problem solving as an action research. This concept is realized by large-scale data collection, probabilistic causal structure model construction and information service providing using the model. One concrete outcome of this project is childhood injury prevention activity in new team consist of hospital, government, and many varieties of researchers. The main result from the project is a general methodology to apply probabilistic causal structure models as servicable knowledge for action research. In this paper, the summary of this project and future direction to emphasize action research driven by artificial intelligence technology are discussed.

  19. 77 FR 37862 - Open-Circuit Self-Contained Breathing Apparatus Remaining Service-Life Indicator Performance...

    Science.gov (United States)

    2012-06-25

    .... Executive Order 13211 (Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution... obstructive pulmonary disease, silicosis, neurological disorders, and cancer. Open-circuit self-contained... result in an annual effect on the economy of $100 million or more. E. Unfunded Mandates Reform Act of...

  20. International Space Station Bacteria Filter Element Service Life Evaluation

    Science.gov (United States)

    Perry, J. L.

    2005-01-01

    The International Space Station (ISS) uses high-efficiency particulate air filters to remove particulate matter from the cabin atmosphere. Known as bacteria filter elements (BFEs), there are 13 elements deployed on board the ISS's U.S. segment in the flight 4R assembly level. The preflight service life prediction of 1 yr for the BFEs is based upon engineering analysis of data collected during developmental testing that used a synthetic dust challenge. While this challenge is considered reasonable and conservative from a design perspective, an understanding of the actual filter loading is required to best manage the critical ISS program resources. Testing was conducted on BFEs returned from the ISS to refine the service life prediction. Results from this testing and implications to ISS resource management are provided.

  1. Reliability and service life of wood structures and buildings

    Directory of Open Access Journals (Sweden)

    Zdeňka Havířová

    2005-01-01

    Full Text Available Service life of constructions and buildings of wood is dependent on temperature and moisture conditions in layers of the building cladding where the wood framework is built in. Temperature/moisture conditions or the corresponding equilibrium moisture content (EMC of the construction show considerable effects on the functional reliability of the whole building from the viewpoint of mechanical resistance and stability (ER1, energy savings and thermal protection (ER6 and hygiene, health and environment protection (ER3. To ensure the reliability of constructions and buildings for the period of their supposed service life a more profound analysis of constructions is necessary from the aspect of a global thermal/technical evaluation.

  2. Reliability and service life of wood structures and buildings

    OpenAIRE

    Zdeňka Havířová; Pavel Kubů

    2005-01-01

    Service life of constructions and buildings of wood is dependent on temperature and moisture conditions in layers of the building cladding where the wood framework is built in. Temperature/moisture conditions or the corresponding equilibrium moisture content (EMC) of the construction show considerable effects on the functional reliability of the whole building from the viewpoint of mechanical resistance and stability (ER1), energy savings and thermal protection (ER6) and hygiene, health and e...

  3. Creep, fatigue and creep-fatigue damage evaluation and estimation of remaining life of SUS 304 austenitic stainless steel at high temperature

    International Nuclear Information System (INIS)

    Nishino, Seiichi; Sakane, Masao; Ohnami, Masateru

    1986-01-01

    Experimental study was made on the damage evaluation and estimation of remaining life of SUS 304 stainless steel in creep, low-cycle fatigue and creep-fatigue at 873 K in air. Creep, fatigue and creep-fatigue damage curves were drawn by the method proposed by D.A. Woodford and the relations between these damages and non-destructive parameters, i.e., microvickers hardness and quantities obtained from X-ray diffraction, were discussed. From these tests, the following conclusions were obtained. (1) Constant damage lines in the diagram of remaining lives in creep and fatigue could be drawn by changing load levels during the tests. Constant damage lines in creep-fatigue were also made by a linear damage rule using both static creep and fatigue damage curves, which agree well with the experimental data in creep-fatigue. (2) Microvickers hardness and half-value breadth in X-ray diffraction are appropriate parameters to evaluate creep damage but are not proper to evaluate fatigue damage. Particle size and microstrain obtained by X-ray profile analysis are good parameters to evaluate both creep and fatigue damages. (author)

  4. Tools for in service monitoring and testing of riser to prevent failure and extend service life

    Energy Technology Data Exchange (ETDEWEB)

    Ward, Haakon; Bondevik, Jon Olav; Skjerve, Haavard; Tveit, Oeyvind [SeaFlex AS, Asker (Norway)

    2005-07-01

    Exploration and development of new oil and gas fields is heavily dependant on use of flexible pipes and many field developments would not have been possible without them. The number of flexible risers in service is constantly increasing since relatively few offshore projects have reached the estimated operational life and the operational lifetime of several fields in-service has been extended due to new and improved technology. Many risers have been in service over a large number of years. Some risers have been operated under demanding conditions such as severe dynamic loads, high pressure and temperatures. One may in some cases find that risers actually have shorter service life than estimated in the design phase due to the severe operational conditions. In order to extend the use of the riser, some risers may have to be modified and re-terminated and prepared for a new and less demanding application. In order to operate risers safely, it is important to re-assess the fatigue life in order to prevent potential riser failure. The operator should implement methods and tools for in-service monitoring and testing. This paper addresses efficient and reliable methods and tools for monitoring of critical operational parameters as well as in-service riser testing. A brief description of structural failure modes will also be given in order to understand how to interpret test results in view of potential failure modes. (author)

  5. An integrated unscented kalman filter and relevance vector regression approach for lithium-ion battery remaining useful life and short-term capacity prediction

    International Nuclear Information System (INIS)

    Zheng, Xiujuan; Fang, Huajing

    2015-01-01

    The gradual decreasing capacity of lithium-ion batteries can serve as a health indicator for tracking the degradation of lithium-ion batteries. It is important to predict the capacity of a lithium-ion battery for future cycles to assess its health condition and remaining useful life (RUL). In this paper, a novel method is developed using unscented Kalman filter (UKF) with relevance vector regression (RVR) and applied to RUL and short-term capacity prediction of batteries. A RVR model is employed as a nonlinear time-series prediction model to predict the UKF future residuals which otherwise remain zero during the prediction period. Taking the prediction step into account, the predictive value through the RVR method and the latest real residual value constitute the future evolution of the residuals with a time-varying weighting scheme. Next, the future residuals are utilized by UKF to recursively estimate the battery parameters for predicting RUL and short-term capacity. Finally, the performance of the proposed method is validated and compared to other predictors with the experimental data. According to the experimental and analysis results, the proposed approach has high reliability and prediction accuracy, which can be applied to battery monitoring and prognostics, as well as generalized to other prognostic applications. - Highlights: • An integrated method is proposed for RUL prediction as well as short-term capacity prediction. • Relevance vector regression model is employed as a nonlinear time-series prediction model. • Unscented Kalman filter is used to recursively update the states for battery model parameters during the prediction. • A time-varying weighting scheme is utilized to improve the accuracy of the RUL prediction. • The proposed method demonstrates high reliability and prediction accuracy.

  6. Identifying profiles of service users in housing services and exploring their quality of life and care needs

    NARCIS (Netherlands)

    Bitter, N.A.; Roeg, D.P.K.; Van Nieuwenhuizen, Ch.; Van Weeghel, J.

    2016-01-01

    Background Housing services aim to support people with mental illness in their daily life and recovery. As the level of recovery differs between service users, the quality of life and care needs also might vary. However, the type and amount of care and support that service users receive do not

  7. Effective technical service in the life cycle of heavy dumpers

    Directory of Open Access Journals (Sweden)

    Михайло Валерійович Помазков

    2016-11-01

    Full Text Available A comparative analysis of the known systems of technical reliability of heavy dumpers functionality has been made. It has been stated that the previously proposed methods to determine the optimal service life of heavy-duty dumpers are not effective enough and do not take into account the whole range of factors specific to the operation of heavy dumpers in the current economic realities of industrial enterprises. Based on the analysis results, a mechanism of determining the optimal service life of heavy-duty dumpers and their constituent technical systems ensuring the operational reliability of heavy-duty dumpers has been offered. The article takes into account the analysis of resource factors, general description of system logistic tasks, the main provisions of serviceability, the resource forming in route charts at ore mining and metallurgical enterprises, the use of theoretical developments in practice. Heavy dumpers generalized description modelling shown in the article, the principle of resource use by using interchangable work at different intensity routes has received confirmation in the dumpers’ work schedule

  8. Service Life Extension of the Propulsion System of Long-Term Manned Orbital Stations

    Science.gov (United States)

    Kamath, Ulhas; Kuznetsov, Sergei; Spencer, Victor

    2014-01-01

    life and increases at the end when the design service life ends and wear-out phase begins. However, the component failure rates do not remain constant over the entire cycle life. The failure rate depends on various factors such as design complexity, current age of the component, operating conditions, severity of environmental stress factors, etc. Development, qualification and acceptance test processes provide rigorous screening of components to weed out imperfections that might otherwise cause infant mortality failures. If sufficient samples are tested to failure, the failure time versus failure quantity can be analyzed statistically to develop a failure probability distribution function (PDF), a statistical model of the probability of failure versus time. Driven by cost and schedule constraints however, spacecraft components are generally not tested in large numbers. Uncertainties in failure rate and remaining life estimates increase when fewer units are tested. To account for this, spacecraft operators prefer to limit useful operations to a period shorter than the maximum demonstrated service life of the weakest component. Running each component to its failure to determine the maximum possible service life of a system can become overly expensive and impractical. Spacecraft operators therefore, specify the required service life and an acceptable factor of safety (FOS). The designers use these requirements to limit the life test duration. Midway through the design life, when benefits justify additional investments, supplementary life test may be performed to demonstrate the capability to safely extend the service life of the system. An innovative approach is required to evaluate the entire system, without having to go through an elaborate test program of propulsion system elements. Evaluating every component through a brute force test program would be a cost prohibitive and time consuming endeavor. ISS propulsion system components were designed and built decades ago

  9. Quality of life evaluation of workers for diagnostic radiology services

    International Nuclear Information System (INIS)

    Fernandes, Ivani Martins

    2011-01-01

    The main objective of this study was to evaluate the quality of life (QOL) of diagnostic radiology services workers at a hospital of Sao Paulo city. It aimed also to draw the profile of these workers identifying the variables, as its influence on their quality of life. A descriptive exploratory study with qualitative and quantitative approaches was carried out. The data were collected using the questionnaires: the abbreviated instrument for the assessment of the QOL, World Health Organization Quality of Life Instrument bref (WHOQOL-bref) and a questionnaire including the social demographic variables, work conditions and the variables that express the lifestyle of individuals, both questionnaires self-applied. The sample was formed by 118 workers, among them: physicians, technologists/technicians in radiology, nurses, technicians and assistants in nursing, and others health professionals. The data analysis included descriptive statistics, nonparametric tests and the use of a linear regression model. The reliability of the instrument for the studied sample was verified by Cronbach's Alpha Coefficient (α). The WHOQOL-bref proved to be an adequate instrument, with a good level of internal consistency (α=0.884), being easily and quickly administrated for the evaluation of the QOL. The study provided an overview of the perception of quality of life of the studied group. (author)

  10. mORCA: ubiquitous access to life science web services.

    Science.gov (United States)

    Diaz-Del-Pino, Sergio; Trelles, Oswaldo; Falgueras, Juan

    2018-01-16

    Technical advances in mobile devices such as smartphones and tablets have produced an extraordinary increase in their use around the world and have become part of our daily lives. The possibility of carrying these devices in a pocket, particularly mobile phones, has enabled ubiquitous access to Internet resources. Furthermore, in the life sciences world there has been a vast proliferation of data types and services that finish as Web Services. This suggests the need for research into mobile clients to deal with life sciences applications for effective usage and exploitation. Analysing the current features in existing bioinformatics applications managing Web Services, we have devised, implemented, and deployed an easy-to-use web-based lightweight mobile client. This client is able to browse, select, compose parameters, invoke, and monitor the execution of Web Services stored in catalogues or central repositories. The client is also able to deal with huge amounts of data between external storage mounts. In addition, we also present a validation use case, which illustrates the usage of the application while executing, monitoring, and exploring the results of a registered workflow. The software its available in the Apple Store and Android Market and the source code is publicly available in Github. Mobile devices are becoming increasingly important in the scientific world due to their strong potential impact on scientific applications. Bioinformatics should not fall behind this trend. We present an original software client that deals with the intrinsic limitations of such devices and propose different guidelines to provide location-independent access to computational resources in bioinformatics and biomedicine. Its modular design makes it easily expandable with the inclusion of new repositories, tools, types of visualization, etc.

  11. [PALEOPATHOLOGY OF HUMAN REMAINS].

    Science.gov (United States)

    Minozzi, Simona; Fornaciari, Gino

    2015-01-01

    Many diseases induce alterations in the human skeleton, leaving traces of their presence in ancient remains. Paleopathological examination of human remains not only allows the study of the history and evolution of the disease, but also the reconstruction of health conditions in the past populations. This paper describes the most interesting diseases observed in skeletal samples from the Roman Imperial Age necropoles found in urban and suburban areas of Rome during archaeological excavations in the last decades. The diseases observed were grouped into the following categories: articular diseases, traumas, infections, metabolic or nutritional diseases, congenital diseases and tumours, and some examples are reported for each group. Although extensive epidemiological investigation in ancient skeletal records is impossible, the palaeopathological study allowed to highlight the spread of numerous illnesses, many of which can be related to the life and health conditions of the Roman population.

  12. Stator winding service life analysis of wet winding motor RCP

    International Nuclear Information System (INIS)

    Yeoh Eingyee; Li Linsen; Wang Ziguan; Shen Feng

    2017-01-01

    The reactor coolant pump type RUV of KSB is specially designed for the Westinghouse AP1000 reactor. It is hermetically sealed, wet winding motor pump. This wet winding motor concept has higher efficiency as compared to a canned motor since there are no eddy current losses, but this makes the stator cable insulator face the challenge of degradation by γ-irradiation in coolant. Radiation dose at the RUV is evaluated in interest from the material degradation point of view and the service life of stator winding in RUV is preliminarily analyzed. The values obtained are less than the dose rate and the dose which change the mechanical properties of the insulator material. According to the preliminary analysis, it can be concluded that the degradation of cable insulator of stator winding by γ-irradiation in coolant is negligible for the 60 years' service life of reactor coolant pump. This result also ensures crosslinked polyethylene used as cable insulator of stator winding is reliable in reactor coolant pump. (author)

  13. A Model for Service Life Control of Selected Device Systems

    Directory of Open Access Journals (Sweden)

    Zieja Mariusz

    2014-04-01

    Full Text Available This paper presents a way of determining distribution of limit state exceedence time by a diagnostic parameter which determines accuracy of maintaining zero state. For calculations it was assumed that the diagnostic parameter is deviation from nominal value (zero state. Change of deviation value occurs as a result of destructive processes which occur during service. For estimation of deviation increasing rate in probabilistic sense, was used a difference equation from which, after transformation, Fokker-Planck differential equation was obtained [4, 11]. A particular solution of the equation is deviation increasing rate density function which was used for determining exceedance probability of limit state. The so-determined probability was then used to determine density function of limit state exceedance time, by increasing deviation. Having at disposal the density function of limit state exceedance time one determined service life of a system of maladjustment. In the end, a numerical example based on operational data of selected aircraft [weapon] sights was presented. The elaborated method can be also applied to determining residual life of shipboard devices whose technical state is determined on the basis of analysis of values of diagnostic parameters.

  14. Fatigue life prediction of oil ducts under service loads

    Energy Technology Data Exchange (ETDEWEB)

    Meggiolaro, Marco A.; Castro, Jaime T.P. [Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)

    2003-07-01

    A methodology to calculate the residual initiation and propagation lives of fatigue cracks in oil pipelines with corrosion-like defects is proposed and applied to predict the residual life of an old duct made of API 5L Gr. B steel, in service for more than 40 years. Since its inauguration, this pipeline has carried several heated products under variable temperatures and pressures. The calculated (nominal) service stresses are very high, due to thermal loads that induce significant bending in curved parts of the duct, with peaks close to the yield strength of the steel. The elastic- plastic fatigue damage at a notch or a corrosion pit root is calculated using the {epsilon}N method, and the effects of surface semi-elliptical cracks in its internal (or external) wall is studied considering appropriate stress intensity factor expressions and the actual service loads. In the presence of surface flaws associated to stress concentration factors of the order of three, a fatigue crack likely will initiate in the pipeline. However, if these surface cracks are small compared to the duct wall thickness, their predicted propagation rates are very low. (author)

  15. Design and analysis of seals for extended service life

    Science.gov (United States)

    Bower, Mark V.

    1992-01-01

    Space Station Freedom is being developed for a service life of up to thirty years. As a consequence, the design requirements for the seals to be used are unprecedented. Full scale testing to assure the selected seals can satisfy the design requirements are not feasible. As an alternative, a sub-scale test program has been developed by MSFC to calibrate the analysis tools to be used to certify the proposed design. This research has been conducted in support of the MSFC Integrated Seal Test Program. The ultimate objective of this research is to correlate analysis and test results to qualify the analytical tools, which in turn, are to be used to qualify the flight hardware. This research is totally focused on O-rings that are compressed by perpendicular clamping forces. In this type of seal the O-ring is clamped between the sealing surfaces by loads perpendicular to the circular cross section.

  16. Associations of Quality of Life with Service Satisfaction in Psychotic Patients: A Meta-Analysis

    Science.gov (United States)

    Petkari, Eleni; Pietschnig, Jakob

    2015-01-01

    Background Quality of life (QoL) has gained increasing attention as a desired outcome of psychosocial treatments targeting psychotic patients. Yet, the relationship between the patients’ satisfaction with services and QoL has not been clearly established, perhaps due to the multidimensionality of the QoL concept and the variability in its assessment. Aim This is the first systematic meta-analysis of all available evidence assessing the relationship between QoL and service satisfaction. Methods: In all, 19 studies reporting data of 21 independent samples (N = 5,337) were included in the present meta-analysis. In moderator analyses, effects of age, sex, diagnoses (schizophrenia vs. other psychoses), treatment context (inpatients vs. outpatients), study design (cross-sectional vs. longitudinal), and QoL domain (subjective vs. health-related) were examined. Results Analyses revealed a highly significant medium-sized effect (r = .30, p service satisfaction. Effect sizes were significantly stronger for subjective than health-related quality of life (r = .35 vs. r = .14, respectively). Moreover, associations with subjective QoL remained largely robust when accounting for moderating variables, although there was a trend of stronger associations for outpatients compared to inpatients. In contrast, effect sizes for health-related QoL were small and only observable for samples with longitudinal designs. Conclusion Associations between QoL and service satisfaction appear to be robust but are differentiated in regard to QoL domain. Our findings suggest that agents responsible for service design and implementation need to take the patients’ perception of the service adequacy for achieving QoL enhancement into account. PMID:26275139

  17. Complex investigations for the technical diagnosis and constructive optimization of the pipe systems from Rovinari power plant to extend their remaining life

    Energy Technology Data Exchange (ETDEWEB)

    Delamarian, C. [Technischer Ueberwachungs-Verein Sueddeutschland (TUeV), Muenchen (Germany); Lupescu, L.; Nicolescu, N. [Institutul de Studii si Proiectari Energetice, Bucharest (Romania); Pisc, I.; Botis, A. [ISIM, Timisoara (Romania)

    2003-07-01

    The remnant life assessment of power plant components is an issue of a high importance all over the Europe and not only. The need of power products, the environmental-related restrictions within this field as well as the task of lowering the fabrication costs led to and increased importance of maintenance and retrofit activities of old power equipment during the last decade. Replacement of pipe lines exceeding their designed life is no longer regarded as an option for power plant managers. Instead, life assessment techniques combined with state of the art design and fabrication methods focusing on the replacement of damaged components as well as redesign of pipe line systems in order to eliminate overloading and/or secondary stresses that usually lead to premature life exhaustion are only some of the issues discussed within this paper. It deals with the retrofit of a conventional power plant (Group no. 3 of Rovinari Power Plant) which reached its designed life after about 110.000 operating hours. The need of improvement of the boiler efficiency as well as the extension of the plant life, maintaining in the same time old, but still good components determined the three companies (ISPE, ISIM and TUeV) to gather their skills in order to reach this task. (orig.)

  18. Quality of life in Nepalese patients with low vision and the impact of low vision services

    Directory of Open Access Journals (Sweden)

    Rajendra Gyawali

    2012-10-01

    Conclusions: Low vision patients have poor quality of life as measured with the NEI VFQ-25. Low vision service is associated with improved visual function, better quality of life and high rate of patient satisfaction.

  19. Explosives remain preferred methods for platform abandonment

    International Nuclear Information System (INIS)

    Pulsipher, A.; Daniel, W. IV; Kiesler, J.E.; Mackey, V. III

    1996-01-01

    Economics and safety concerns indicate that methods involving explosives remain the most practical and cost-effective means for abandoning oil and gas structures in the Gulf of Mexico. A decade has passed since 51 dead sea turtles, many endangered Kemp's Ridleys, washed ashore on the Texas coast shortly after explosives helped remove several offshore platforms. Although no relationship between the explosions and the dead turtles was ever established, in response to widespread public concern, the US Minerals Management Service (MMS) and National Marine Fisheries Service (NMFS) implemented regulations limiting the size and timing of explosive charges. Also, more importantly, they required that operators pay for observers to survey waters surrounding platforms scheduled for removal for 48 hr before any detonations. If observers spot sea turtles or marine mammals within the danger zone, the platform abandonment is delayed until the turtles leave or are removed. However, concern about the effects of explosives on marine life remains

  20. Enhanced design, operation and maintenance practices for a longer plant service life

    International Nuclear Information System (INIS)

    Raimondo, E.; Courcoux, A.

    2004-01-01

    Plant service life problems have been under detailed investigation in France and the experience acquired by our company over the past 25 years in the design, construction and maintenance of Pressurized Water Reactors has contributed to develop skills, equipment and capabilities available for efficient plant aging management and component service life extension. The service life of a nuclear power plant is deeply dependant of the provisions made during the design stage, directly linked to good operating conditions and adequate maintenance practices. This paper presents the importance of these three steps (design, operation and maintenance) for plant service life concern. (author)

  1. Medicaid: State and Federal Actions Have Been Taken to Improve Children's Access to Dental Services, but Gaps Remain. Report to Congressional Requesters. GAO-09-723

    Science.gov (United States)

    US Government Accountability Office, 2009

    2009-01-01

    Children's access to Medicaid dental services is a long-standing concern. The tragic case of a 12-year-old boy who died from an untreated infected tooth that led to a fatal brain infection renewed attention to this issue. He was enrolled in Medicaid--a joint federal and state program that provides health care coverage, including dental care, for…

  2. Optimization of NPP performance and service life in a competitive electricity market

    International Nuclear Information System (INIS)

    Gueorguiev, B.; Spielgelberg - Planner, R.

    2000-01-01

    This paper discusses how the competitive electricity market has influenced nuclear power plant operations, with a focus on optimisation of NPP performance and plant service life, and how the IAEA programme has addressed some of this issues. The definitions of Plant Life, Operational Life, Design Life and Periodical Safety Reviews are developed in the paper in order to differentiate between the terms and to show the significance in terms of Plant Life Management

  3. Remaining Sites Verification Package for the 331 Life Sciences Laboratory Drain Field Septic System. Attachment to Waste Site Reclassification Form 2008-020

    International Nuclear Information System (INIS)

    Capron, J.M.

    2008-01-01

    The 331 Life Sciences Laboratory Drain Field (LSLDF) septic system waste site consists of a diversion chamber, two septic tanks, a distribution box, and a drain field. This septic system was designed to receive sanitary waste water, from animal studies conducted in the 331-A and 331-B Buildings, for discharge into the soil column. However, field observations and testing suggest the 331 LSLDF septic system did not receive any discharges. In accordance with this evaluation, the confirmatory sampling results support a reclassification of the 331 LSLDF waste site to No Action. This site does not have a deep zone or other condition that would warrant an institutional control in accordance with the 300-FF-2 ROD under the industrial land use scenario

  4. Perceptions of Pre-Service Teachers on Student Burnout, Occupational Anxiety and Faculty Life Quality

    Science.gov (United States)

    Türkoglu, Muhammet Emin; Cansoy, Ramazan

    2017-01-01

    Perceptions of pre-service teachers on burnout, occupational anxiety and faculty life quality were investigated in this research. The research group consisted of 461 pre-service teachers in total studying at Afyon Kocatepe University faculty of education. "Maslach Burnout Inventory-Student Form," "Faculty Life Quality Scale"…

  5. Service life of 1-W, 0.985-μm solitary heterolasers

    International Nuclear Information System (INIS)

    Kochetkov, A A; Konyaev, V P

    2001-01-01

    The service life of solitary heterolasers at a temperature of 50 0 C (P = 1W, λ = 0.98 - 0.99 μm) is studied. The maximum service life of heterolasers under such working conditions is 60000 hours for an average pumping current 1.5 A. (lasers and amplifiers)

  6. Laser shock peening of steam turbine blade for enhanced service life

    Indian Academy of Sciences (India)

    2014-02-13

    Feb 13, 2014 ... Fretting-fatigue is an important factor influencing service life of turbine blades. The present paper describes laser shock peening of potential crack nucleation site in the root region of steam turbine blade for its enhanced service life. The experimental study, performed with an in-house developed 2.5 J/7 ns ...

  7. Successful outsourcing: improving quality of life through integrated support services.

    Science.gov (United States)

    Bates, Jason; Sharratt, Martin; King, John

    2014-01-01

    This article examines the way that non-clinical support services are provided in healthcare settings through outsourcing partnerships. The integrated support services model and benefits to patient experience and safety as well as organizational efficiency and effectiveness are explored through an examination of services at a busy urban community hospital.

  8. Borosonic inspection and remaining useful operational life estimation of steam turbine rotors; Inspeccion borosonica y estimacion de vida remanente de rotores de turbinas de vapor

    Energy Technology Data Exchange (ETDEWEB)

    Carnero P, Jose A; Dorantes G, Oscar; Munoz Q, Rodolfo; Serrano R, Luis E. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2004-07-01

    The turbo-generators used in the electric power generation frequently go through transitory operations (start ups, shut downs or power changes). Such actions cause that certain critical components of the turbines, such as rotors and casings, are put under cycles of repetitive stresses, which consume its useful life. The frequency whereupon these transitory thermal cycles happen result in the presence of high thermo-mechanical stresses that produce fatigue (damage) in the rotor material. With time, at the increase of the material fatigue, fissures form that can inclusively lead to severe, catastrophic faults. The borosonic inspection consists in introducing and positioning an automatic probe in the central drill of the rotor, this allows the non-destructive inspection with longitudinal ultrasonic beam, ultrasonic cross-sectional and ultrasonic superficial. This way, it is possible to detect and locate geometric discontinuities (superficial and volumetric), in at least 100 mm of depth from the drill surface in its entire periphery and throughout the rotor length. [Spanish] Los turbogeneradores empleados en la generacion de energia electrica con frecuencia realizan operaciones transitorias (arranques, paros o cambios de potencia). Acciones tales, provocan que ciertos componentes criticos de las turbinas, como los rotores y carcasas, sean sometidos a ciclos de esfuerzos repetitivos, lo que consume su vida util. La frecuencia con que ocurren estos ciclos termicos transitorios da como resultado la presencia de altos esfuerzos termomecanicos que producen una fatiga (dano) en el material del rotor. Con el tiempo, al incrementarse la fatiga del material, se forman fisuras que pueden conducir a fallas severas, catastroficas inclusive. La inspeccion borosonica consiste en introducir y posicionar una sonda automatica en el barreno central del rotor, ello permite la inspeccion no destructiva con haz ultrasonico longitudinal, haz ultrasonico transversal y haz ultrasonico

  9. Extending service life of steam generators by sleeving tubes

    International Nuclear Information System (INIS)

    Gutzwiller, J.E.

    1982-01-01

    Steam generator tubes that are failing due to IGA in the tubesheet crevice can be kept in service by using the basic sealable sleeve design developed by BandW. Variations of the present sleeve design could significantly reduce the number of tubes that must be plugged each year. Sleeving had the potential of keeping 28 percent more tubes in service during 1979. Lowering the overall rate at which tubes are removed from service by plugging will reduce the probability of having to derate the plant or replace the steam generator. Considering tomorrow's replacement power costs, sleeving to keep tubes in service is a practical and sound investment

  10. Monitoring microstructural evolution of alloy 617 with non-linear acoustics for remaining useful life prediction; multiaxial creep-fatigue and creep-ratcheting

    Energy Technology Data Exchange (ETDEWEB)

    Lissenden, Cliff [Pennsylvania State Univ., State College, PA (United States); Hassan, Tasnin [North Carolina State Univ., Raleigh, NC (United States); Rangari, Vijaya [Tuskegee Univ., Tuskegee, AL (United States)

    2014-10-30

    application of the harmonic generation method to tubular mechanical test specimens and pipes for nondestructive evaluation. Tubular specimens and pipes act as waveguides, thus we applied the acoustic harmonic generation method to guided waves in both plates and shells. Magnetostrictive transducers were used to generate and receive guided wave modes in the shell sample and the received signals were processed to show the sensitivity of higher harmonic generation to microstructure evolution. Modeling was initiated to correlate higher harmonic generation with the microstructure that will lead to development of a life prediction model that is informed by the nonlinear acoustics measurements.

  11. Monitoring microstructural evolution of alloy 617 with non-linear acoustics for remaining useful life prediction; multiaxial creep-fatigue and creep-ratcheting

    International Nuclear Information System (INIS)

    Lissenden, Cliff; Hassan, Tasnin; Rangari, Vijaya

    2014-01-01

    harmonic generation method to tubular mechanical test specimens and pipes for nondestructive evaluation. Tubular specimens and pipes act as waveguides, thus we applied the acoustic harmonic generation method to guided waves in both plates and shells. Magnetostrictive transducers were used to generate and receive guided wave modes in the shell sample and the received signals were processed to show the sensitivity of higher harmonic generation to microstructure evolution. Modeling was initiated to correlate higher harmonic generation with the microstructure that will lead to development of a life prediction model that is informed by the nonlinear acoustics measurements.

  12. Long-term prospective longitudinal evaluation of emotional distress and quality of life in cervical cancer patients who remained disease-free 2-years from diagnosis.

    Science.gov (United States)

    Mantegna, Giovanna; Petrillo, Marco; Fuoco, Gilda; Venditti, Laura; Terzano, Serena; Anchora, Luigi Pedone; Scambia, Giovanni; Ferrandina, Gabriella

    2013-03-18

    A long-term prospective assessment of QoL in cervical cancer patients is still lacking. Here, we provide the first 2-years prospective, longitudinal study evaluating emotional distress and QoL in early stage (ECC) and locally advanced (LACC) cervical cancer patients who remained disease-free 2-years from diagnosis. The questionnaires: Hospital Anxiety and Depression Scale (HADS), Global Health Status items of EORTC QLQ-C30 (GHS), and EORTC QLQ-CX24 (CX24) have been administered by a dedicated team of psycho-oncologists, administered at baseline, and after 3, 6, 12 and 24 months from surgery The Generalized Linear Model for repeated measure was used to analyze modifications of QoL measures over time. In both groups, an early reduction of the percentage of patients with anxiety levels ≥11 was observed at the 3-month evaluation (ECC: 25.7% at baseline Vs 14.7% after 3 months, p value=0.001; LACC: 22.2% at baseline Vs 15.4% after 3 months, p value=0.001). Despite this favorable trend, after 2 years from diagnosis, 11.9% of ECC and 15.6% of LACC patients still showed an anxiety score ≥11. No significant changes over time were observed in term of Depression levels. Focusing on QoL issues, mean GHS and Sexual Activity scores showed an improvement over time in both groups compared to baseline (GHS: 5.7% difference for ECC, p value=0.001, and 11.0% in LACC, p value=0.001; SXA: 13.9% difference for ECC, p value=0.001; and 6.1% in LACC, p value=0.008). On the other hand, Body Image mean scores were significantly impaired by chemoradiation administration in LACC patients, without long-term recovery (7.5% difference, p value=0.001). Finally, in both groups, lymphedema (LY) and menopausal symptoms (MS) showed an early worsening which persisted 2-year after surgery (LY: 19.5% difference for ECC, p value=0.014, and 27.3% in LACC, p value=0.001; MS: 14.4% difference for ECC, p value=0.004, and 16.0% in LACC, p value=0.002). Despite a significant improvement over time, elevated

  13. Probabilistic Design and Management of Sustainable Concrete Infrastructure Using Multi-Physics Service Life Models

    DEFF Research Database (Denmark)

    Lepech, Michael; Geiker, Mette; Michel, Alexander

    This paper looks to address the grand challenge of integrating construction materials engineering research within a multi-scale, inter-disciplinary research and management framework for sustainable concrete infrastructure. The ultimate goal is to drive sustainability-focused innovation and adoption...... cycles in the broader architecture, engineering, construction (AEC) industry. Specifically, a probabilistic design framework for sustainable concrete infrastructure and a multi-physics service life model for reinforced concrete are presented as important points of integration for innovation between...... design, consists of concrete service life models and life cycle assessment (LCA) models. Both types of models (service life and LCA) are formulated stochastically so that the service life and time(s) to repair, as well as total sustainability impact, are described by a probability distribution. A central...

  14. Caregivers' quality of life and quality of services for children with cancer: a review from iran.

    Science.gov (United States)

    Sajjadi, Homeira; Vameghi, Meroe; Ghazinour, Mehdi; Khodaeiardekani, Mohammadreza

    2013-03-04

    Caregivers of cancer patients are exposed to different types of psychosocial stress which influence their quality of life. The purposes of this study were to assess quality of life in caregivers of children with cancer and to investigate the relationship between the caregivers' quality of life and quality of services in the social work section. 125 caregivers were recruited. Quality of life was measured by the Iranian version of the WHOQOL-BREF questionnaire and data concerning service quality were obtained from the Iranian version of the SERVQUAL questionnaire. Scores in physical health, psychological status and environmental conditions for caregivers of children with cancer were significantly lower than the general population. There was a negative correlation between the tangible domain of SERVQUAL and the psychological status and environmental conditions of quality of life. The tangible dimension was the only aspect of service quality to predict caregivers' quality of life regarding psychological status and environmental conditions. Caregivers of children with a disease are care consumers and, like all consumers, they expect good service. Delivering high quality services consistently is difficult but profitable for a service organization. In other words, trying to deliver more appropriate services than patients expect to receive from their social work care is one of the most reliable ways to promote caregivers' satisfaction and quality of life.

  15. Caregivers’ Quality of Life and Quality of Services for Children with Cancer: A Review from Iran

    Science.gov (United States)

    Sajjadi, Homeira; Vameghi, Meroe; Ghazinour, Mehdi; KhodaeiArdakani, Mohammadreza

    2013-01-01

    Objective: Caregivers of cancer patients are exposed to different types of psychosocial stress which influence their quality of life. The purposes of this study were to assess quality of life in caregivers of children with cancer and to investigate the relationship between the caregivers’ quality of life and quality of services in the social work section. Method: 125 caregivers were recruited. Quality of life was measured by the Iranian version of the WHOQOL-BREF questionnaire and data concerning service quality were obtained from the Iranian version of the SERVQUAL questionnaire. Findings: Scores in physical health, psychological status and environmental conditions for caregivers of children with cancer were significantly lower than the general population. There was a negative correlation between the tangible domain of SERVQUAL and the psychological status and environmental conditions of quality of life. The tangible dimension was the only aspect of service quality to predict caregivers’ quality of life regarding psychological status and environmental conditions. Conclusion: Caregivers of children with a disease are care consumers and, like all consumers, they expect good service. Delivering high quality services consistently is difficult but profitable for a service organization. In other words, trying to deliver more appropriate services than patients expect to receive from their social work care is one of the most reliable ways to promote caregivers’ satisfaction and quality of life. PMID:23618487

  16. Service Life Of Main Piping Component Due To Low Thermal Stresses.Fatigue

    International Nuclear Information System (INIS)

    Miroshnik, R.; Jeager, A.; Ben Haim, H.

    1998-01-01

    The paper deals with estimating the service life of the power station Main piping component and describing the repair process for extending of its service life. After a long period of service, several circular fatigue cracks have been discovered at the bottom of the Main piping component chamber. Finite element analyses of transient thermal stresses, caused by power station startup, are carried out in the paper. The calculation results show good agreement between the theoretical locations of the maximum stresses and the actual locations of the cracks. There is a good agreement between theoretical evaluation and actual service life, as well. The possibility of machining out the cracks in order to prevent their growing is examined here. The machining enables us to extend the power station component's life service

  17. ICT Services for Life Improvement for the Elderly.

    Science.gov (United States)

    Sánchez-Rico, Alejandro; Garel, Pascal; Notarangelo, Isabella; Quintana, Marcos; Hernández, Gustavo; Asteriadis, Stylianos; Popa, Mirela; Vretos, Nicholas; Solachidis, Vassilis; Burgos, Marta; Girault, Ariane

    2017-01-01

    Integrated care ICT Platform to support patients, care-givers and health/social professionals in the care of dementia and Parkinson's disease with training, empowerment, sensor-based data analysis and cooperation services based on user-friendly interfaces.

  18. Identifying profiles of service users in housing services and exploring their quality of life and care needs.

    Science.gov (United States)

    Bitter, Neis A; Roeg, Diana P K; van Nieuwenhuizen, Chijs; van Weeghel, Jaap

    2016-11-23

    Housing services aim to support people with mental illness in their daily life and recovery. As the level of recovery differs between service users, the quality of life and care needs also might vary. However, the type and amount of care and support that service users receive do not always match their recovery. In order to improve the quality of care, this study aims to explore whether subgroups of service users exist based on three dimensions of recovery and to examine and compare the quality of life and care needs of the persons in these subgroups. Latent class analysis was performed with data from 263 service users of housing services in the Netherlands. Classes were based on three variables: personal recovery (Mental Health Recovery Measure), social recovery (Social Functioning Scale), and clinical recovery (Brief Symptom Inventory). Subsequently, the quality of life (MANSA) and care needs (CANSAS) of the different classes were analysed by the use of descriptive and inferential statistics. Three classes could be distinguished. Class 1 (45%) comprised of people who score the highest of the three classes in terms of personal and social recovery and who experience the least number of symptoms. People in class 2 (44%) and class 3 (11%) score significantly lower on personal and social recovery, and they experience significantly more symptoms compared to class 1. The distinction between class 2 and 3 can be made on the significantly higher number of symptoms in class 3. All three classes differ significantly on quality of life and unmet needs. The quality of life of service users of housing services needs improvement, as even persons in the best-recovered subgroup have a lower quality of life than the average population. Workers of housing services need to be aware of the recovery of a client and what his or her individual needs and goals are. Furthermore, better care (allocation) concerning mental and physical health and rehabilitation is needed. Care should be

  19. Associated and mediating variables related to quality of life among service users with mental disorders.

    Science.gov (United States)

    Fleury, Marie-Josée; Grenier, Guy; Bamvita, Jean-Marie

    2018-02-01

    This study aimed to identify variables associated with quality of life (QoL) and mediating variables among 338 service users with mental disorders in Quebec (Canada). Data were collected using nine standardized questionnaires and participant medical records. Quality of life was assessed with the Satisfaction with Life Domains Scale. Independent variables were organized into a six-block conceptual framework. Using structural equation modeling, associated and mediating variables related to QoL were identified. Lower seriousness of needs was the strongest variable associated with QoL, followed by recovery, greater service continuity, gender (male), adequacy of help received, not living alone, absence of substance use or mood disorders, and higher functional status, in that order. Recovery was the single mediating variable linking lower seriousness of needs, higher service continuity, and reduced alcohol use with QoL. Findings suggest that greater service continuity creates favorable conditions for recovery, reducing seriousness of needs and increasing QoL among service users. Lack of recovery-oriented services may affect QoL among alcohol users, as substance use disorders were associated directly and negatively with QoL. Decision makers and mental health professionals should promote service continuity, and closer collaboration between primary care and specialized services, while supporting recovery-oriented services that encourage service user involvement in their treatment and follow-up. Community-based organizations should aim to reduce the seriousness of needs particularly for female service users and those living alone.

  20. review on hardfacing as method of improving the service life

    African Journals Online (AJOL)

    eobe

    soft base metal surface to enhance resistance to different wear mechanisms. .... shape and distribution of primary and eutectic carbides ... C-Si-Mn-B electrode resulted in an average hardness of ... blade material .... This consists of weld beads that run parallel to each ..... [54] Wallin, J. “Five basic steps to extend the life of.

  1. Computer Aided Product Service Systems Design : Service CAD and Its integration with Life Cycle Simulation

    NARCIS (Netherlands)

    Komoto, H.

    2009-01-01

    Integration of product design into service design, or vice versa, is considered to bring more efficient and effective value addition. Besides EcoDesign tools and methods, a methodology to design such an integration of products and services from a systemic perspective, or product-service systems

  2. Evaluation of operating experience for service life of components

    International Nuclear Information System (INIS)

    Schulz, H.; Sunder, R.

    1987-01-01

    The evaluation of the operating experience of German light-water reactor components based on licensee event reports indicates that a large part of the defects and failures are caused by fatigue and/or corrosion type mechanisms. Actions have been taken to eliminate the causes by redesigning systems, replacement of components and change of operating procedures. The interaction of fatigue and corrosion mechanisms are not understood in all details today, further research is still necessary. To establish a more realistic data base of the local loading and water chemistry condition for all loading conditions the application of advanced monitoring systems is proposed. The benefits of these systems are that the operating procedures can be further optimized, the actual used life time fraction can be calculated regularly and the data base can be used for life time extension. (orig.) [de

  3. Family Quality of Life: A Key Outcome in Early Childhood Intervention Services--A Scoping Review

    Science.gov (United States)

    Bhopti, Anoo; Brown, Ted; Lentin, Primrose

    2016-01-01

    A scoping review was conducted to identify factors influencing the quality of life of families of children with disability. The review also explored the scales used to measure family quality of life (FQOL) as an outcome in early childhood intervention services (ECIS). Multiple databases were searched from 2000 to 2013 to include studies pertinent…

  4. Service life assessment of timber highway bridges in USA climate zones

    Science.gov (United States)

    James P. Wacker; Brian K. Brashaw; Thomas G. Williamson; P. David Jones; Matthew S. Smith; Travis K. Hosteng; David L. Strahl; Lola E. Coombe; V.J. Gopu

    2014-01-01

    As engineers begin to estimate life-cycle costs and sustainable design approaches for timber bridges, there is a need for more reliable data about their durability and expected service life. This paper summarizes a comprehensive effort to assess the current condition of more than one hundred timber highway bridge superstructures throughout the United States. This...

  5. Recreation as a Related Service: Focusing on the Quality of Life of Students with Disabilities

    Science.gov (United States)

    Diodati, Melissa R.

    2017-01-01

    Leisure participation is influential on the quality of life of individuals. Individuals with disabilities can face barriers in leisure participation, impacting their quality of life. IDEA (2004) recognizes recreation as a related service as one way to enhance the leisure experiences for students with disabilities. The purpose of this embedded case…

  6. Tackling the work-life balance challenge in Professional Service Firms: the impact of projects, organizing and service characteristics

    NARCIS (Netherlands)

    Noury, L.C.; Gand, Sébastien; Sardas, Jean-Claude

    2017-01-01

    Professional Service Firms (PSFs) are currently under considerable pressure for economic reasons (low growth, pressure on cost), but also from the emergence of individual demands for work-life balance (WLB) from professionals, which challenge traditional ways of organizing both projects and careers.

  7. Structural and mechanical factors of construction strength and service life

    International Nuclear Information System (INIS)

    Makhutov, N.A.; Romanov, A.N.

    1977-01-01

    The methods are considered of solution of strength and long-term stability probems of fabricated structures on the basis of proper mechanical characteristics of materials determined by material composition and structure. The principle equations of structural mechanics, the theories of elasticity, plasticity, creep and strength are used in the analysis of structural strength. The initial parameters of these equations are geometric and service characteristics of structures and the properties of structural materials determined by laboratory specimen testing

  8. Measuring the Effect of Tourism Services on Travelers' Quality of Life: Further Validation.

    Science.gov (United States)

    Neal, Janet D.; Sirgy, M. Joseph; Uysal, Muzaffer

    2004-01-01

    lication and extension study provided additional validational support of the original tourism services satisfaction measure in relation to QOL-related measures.Neal, Sirgy and Uysal (1999) developed a model and a measure to capture the effect of tourism services on travelers' quality of life (QOL). They hypothesized that travelers' overall life…

  9. Experimental methods for consideration of concrete cracking in service life design

    DEFF Research Database (Denmark)

    Pease, Bradley Justin; Geiker, Mette Rica; Stang, Henrik

    2011-01-01

    .e., concrete with cracks at start of service) and to more accurately estimate time-to-cracking due to reinforcement corrosion based on experimental measurements. This paper presents two non-destructive measurement techniques with potential to quantify the impact concrete cracks have on service life...

  10. Advanced medical life support procedures in vitally compromised children by a helicopter emergency medical service.

    NARCIS (Netherlands)

    Gerritse, B.M.; Schalkwijk, A.; Pelzer, B.J.; Scheffer, G.J.; Draaisma, J.M.T.

    2010-01-01

    BACKGROUND: To determine the advanced life support procedures provided by an Emergency Medical Service (EMS) and a Helicopter Emergency Medical Service (HEMS) for vitally compromised children. Incidence and success rate of several procedures were studied, with a distinction made between procedures

  11. Measuring Service-Mindedness and Its Relationship with Spirituality and Life Satisfaction

    Science.gov (United States)

    Pashak, Travis J.; Laughter, Tim C.

    2012-01-01

    A self-report measure of service-mindedness was designed in order to fill in a gap in the literature and evaluate a potential link between spirituality and satisfaction with life. A sample of 133 undergraduate students at a Catholic university in the Mid-west completed the Service-Mindedness Scale (SMS), along with the Spiritual Involvement and…

  12. Using life strategies to explore the vulnerability of ecosystem services to invasion by alien plants

    NARCIS (Netherlands)

    Vicente, J.; Pinro, A.; Araujo, M.; Lomba, A.; Randin, C.; Guisan, A.; Honrado, J.; Verburg, P.H.

    2013-01-01

    Invasive plants can have different effects on ecosystem functioning and on the provision of ecosystem services, with the direction and magnitude of such effects depending on the service and ecosystem being considered, but also on the life strategies of the invaders. Strategies can influence

  13. Home care clients in the last year of life: is material deprivation associated with service characteristics?

    Science.gov (United States)

    Goodridge, Donna; Buckley, Alan; Marko, Josh; Steeves, Megan; Turner, Hollie; Whitehead, Steve

    2011-09-01

    To compare demographic, social, medical, and health care characteristics of home care clients in the last year of life by quintile of deprivation and examine associations between material deprivation and service characteristics. This retrospective study used administrative data for 700 clients who died while receiving home care services. Outcome measures were the receipt of supportive or palliative home care. Associations were assessed using multiple logistic regression. Material deprivation was not associated with either the hours of home care received or the receipt of supportive home care services. Clients with dementia or stroke, those were older than 80 years and those who were single were less likely to receive palliative care services than other groups. Inequalities in allocation of home care services based on age, diagnosis, and marital status, but not material deprivation, suggest the need to carefully match service with need at the end of life.

  14. Shift work to balance everyday life - a salutogenic nursing perspective in home help service in Sweden.

    Science.gov (United States)

    Agosti, Madelaine Törnquist; Andersson, Ingemar; Ejlertsson, Göran; Janlöv, Ann-Christin

    2015-01-01

    Nurses in Sweden have a high absence due to illness and many retire before the age of sixty. Factors at work as well as in private life may contribute to health problems. To maintain a healthy work-force there is a need for actions on work-life balance in a salutogenic perspective. The aim of this study was to explore perceptions of resources in everyday life to balance work and private life among nurses in home help service. Thirteen semi-structured individual interviews and two focus group interviews were conducted with home help service nurses in Sweden. A qualitative content analysis was used for the analyses. In the analyses, six themes of perceptions of recourses in everyday life emerged; (i) Reflecting on life. (ii) Being healthy and taking care of yourself. (iii) Having a meaningful job and a supportive work climate. (iv) Working shifts and part time. (v) Having a family and a supporting network. (vi) Making your home your castle. The result points out the complexity of work-life balance and support that the need for nurses to balance everyday life differs during different phases and transitions in life. In this salutogenic study, the result differs from studies with a pathogenic approach. Shift work and part time work were seen as two resources that contributed to flexibility and a prerequisite to work-life balance. To have time and energy for both private life and work was seen as essential. To reflect on and discuss life gave inner strength to set boundaries and to prioritize both in private life and in work life. Managers in nursing contexts have a great challenge to maintain and strengthen resources which enhance the work-life balance and health of nurses. Salutogenic research is needed to gain an understanding of resources that enhance work-life balance and health in nursing contexts.

  15. Citizen and Resident Satisfaction with Public Services in Qatar : And the impact on quality of life

    OpenAIRE

    Benmansour, Nada Abdelkader , [بن منصور، ندى عبد القادر

    2016-01-01

    In Qatar notable differences in public service satisfaction exist across individual state services, across nationality groupings, and across demographic categories. Among all citizens and residents, however, there is an empirical link between satisfaction with state services and overall perceptions of quality of life. Policymakers should thus study efforts to collect regular and systematic data on the performance of key public institutions, including through the collection of consumer feedbac...

  16. Improving the service life and performance of CANDU fuel channels

    International Nuclear Information System (INIS)

    Causey, A.R.; Cheadle, B.A.; Coleman, C.E.; Price, E.G.

    1997-01-01

    The development objective for CANDU fuel channels is to produce a design that can operate for 40 years at 90% capacity. Steady progress toward this objective is being made. The factors that determine the life of the channel are reviewed and the processes necessary to achieve the objectives identified. Performance of future fuel channels will be enhanced by reduced operating costs, increased safety margins to postulated accident conditions, and reduced retubing costs compared to current channels. The approaches to these issues are discussed briefly in the paper. (author)

  17. Improving the service life and performance of CANDU fuel channels

    International Nuclear Information System (INIS)

    Causey, A.R.; Cheadle, B.A.; Coleman, C.E.; Price, E.G.

    1996-02-01

    The development objective for CANDU fuel channels is to produce a design that can operate for 40 years at 90% capacity. Steady progress toward this objective is being made. The factors that determine the life of a CANDU fuel channel are reviewed and the processes necessary to achieve the objectives identified. Performance of future fuel channels will be enhanced by reduced operating costs, increased safety margins to postulated accident conditions, and reduced retubing costs compared with those for current channels. The approaches to these issues are discussed briefly in this report. (author). 14 refs., 1 tab., 8 figs

  18. Improving the service life and performance of CANDU fuel channels

    International Nuclear Information System (INIS)

    Coleman, C.E.; Cheadle, B.A.; Causey, A.R.; Doubt, G.L.; Fong, R.W.L.; Venkatapathi, S.

    1996-03-01

    The development objective for CANDU fuel channels is to produce a design that can operate for 40 years at 90% capacity. Steady progress toward this objective is being made. The factors that determine the life of a CANDU fuel channel are reviewed and the processes necessary to achieve the objectives are identified. Performance of future fuel channels will be enhanced by reduced operating costs and increased safety margins to postulated accident conditions compared with those for current channels. The approaches to these issues are discussed briefly in this report. (author)

  19. Prediction of the Service Life of a Reinforced Concrete Column under Chloride Environment

    Directory of Open Access Journals (Sweden)

    Mohammad K. Alkam

    2015-01-01

    Full Text Available In the present investigation, service life of a reinforced concrete column exposed to chloride environment has been predicted. This study has been based on numerical simulation of chloride ion diffusion in a concrete column during its anticipated life span. The simulation process has included the concrete cover replacement whenever chloride ion concentration has reached the critical threshold value at the reinforcement surface. Repair scheduling of the concrete column under consideration has been discussed. Effects of the concrete cover thickness and the water cement ratio on the service life of the concrete column at hand have been presented. A new approach for arranging locations of reinforcement steel bars has been introduced. This approach is intended to prolong the service life of the concrete column under consideration against chloride induced corrosion.

  20. Predicting current serviceability and residual service life of plywood roof sheathing using kinetics-based models

    Science.gov (United States)

    J.E. Winandy; P.K. Lebow; J.F. Murphy

    2002-01-01

    Research programs throughout North America are increasingly focusing on understanding and defining the salient issues of wood durability and maintaining and extending the serviceability of existing wood structures. This report presents the findings and implications of a 10-year research program, carried out at the USDA Forest Service, Forest Products Laboratory, to...

  1. BioCatalogue: a universal catalogue of web services for the life sciences.

    Science.gov (United States)

    Bhagat, Jiten; Tanoh, Franck; Nzuobontane, Eric; Laurent, Thomas; Orlowski, Jerzy; Roos, Marco; Wolstencroft, Katy; Aleksejevs, Sergejs; Stevens, Robert; Pettifer, Steve; Lopez, Rodrigo; Goble, Carole A

    2010-07-01

    The use of Web Services to enable programmatic access to on-line bioinformatics is becoming increasingly important in the Life Sciences. However, their number, distribution and the variable quality of their documentation can make their discovery and subsequent use difficult. A Web Services registry with information on available services will help to bring together service providers and their users. The BioCatalogue (http://www.biocatalogue.org/) provides a common interface for registering, browsing and annotating Web Services to the Life Science community. Services in the BioCatalogue can be described and searched in multiple ways based upon their technical types, bioinformatics categories, user tags, service providers or data inputs and outputs. They are also subject to constant monitoring, allowing the identification of service problems and changes and the filtering-out of unavailable or unreliable resources. The system is accessible via a human-readable 'Web 2.0'-style interface and a programmatic Web Service interface. The BioCatalogue follows a community approach in which all services can be registered, browsed and incrementally documented with annotations by any member of the scientific community.

  2. How Do Mobile Information Services Improve Quality of Life? The Case of Japanese Students

    OpenAIRE

    Ghyas, Qazi Mahdia; Kondo, Fumiyo N.

    2016-01-01

    Every technology should be geared to improve the quality of users’ lives. Our study aims to understand how mobile information services (MIS) contribute to quality of life (QoL) for young mobile users. This paper attempts to provide a comprehensive analysis of relationship between two variables: the contribution of MIS in 15 specific life domains and the contribution of MIS to overall quality of life (QoL). We examined bottom-up spillover theory with original and our additional life domains. E...

  3. Shift work to balance everyday life - a salutogenic nursing perspective in home help service in Sweden

    OpenAIRE

    Agosti, Madelaine T?rnquist; Andersson, Ingemar; Ejlertsson, G?ran; Janl?v, Ann-Christin

    2015-01-01

    Background: Nurses in Sweden have a high absence due to illness and many retire before the age of sixty. Factors at work as well as in private life may contribute to health problems. To maintain a healthy work–force there is a need for actions on work-life balance in a salutogenic perspective. The aim of this study was to explore perceptions of resources in everyday life to balance work and private life among nurses in home help service. Methods: Thirteen semi-structured individual interviews...

  4. Effect of home care service on the quality of life in patients with gynecological cancer.

    Science.gov (United States)

    Aktas, Demet; Terzioglu, Fusun

    2015-01-01

    The purpose of the research was to determine the effect of home care service on the quality of life in patients with gynecological cancer. This randomized case control study was carried out in a womans hospital between September 2011 and February 2012. Women undergoing gynecological cancer treatment were separated into intervention and control groups, of 35 patients each. The intervention group was provided with nursing care service through hospital and home visits (1st, 12th weeks) within the framework of a specifically developed nursing care plan. The control group was monitored without any intervention through the hospital routine protocols (1st, 12th weeks). Data were collected using An Interview Form, Home Visit Monitoring Form and Quality of Life Scale/Cancer Survivors. Effects of home care service on the quality of life in gynecological cancer patients were investigated using chi-square tests, McNemar's test, independent t-test and ANOVA. This study found that the intervention group receiving home care service had a moderately high quality of life (average mean: 6.01±0.64), while the control group had comparatively lower quality (average mean: 4.35±0.79) within the 12 week post- discharge period (phome care services to be efficient in improving the quality of life in patients with gynecological cancer.

  5. Evaluation of Hose in Hose Transfer Line Service Life for Hanford's Interim Stabilization Program

    International Nuclear Information System (INIS)

    TORRES, T.D.

    2000-01-01

    RPP-6153, Engineering Task Plan for Hose-in-Hose Transfer System for the Interim Stabilization Program, defines the programmatic goals, functional requirements, and technical criteria for the development and subsequent installation of transfer line equipment to support Hanford's Interim Stabilization Program. RPP-6028, Specification for Hose in Hose Transfer Lines for Hanford's Interim Stabilization Program, has been issued to define the specific requirements for the design, manufacture, and verification of transfer line assemblies for specific waste transfer applications. Included in RPP-6028 are tables defining the chemical constituents of concern to which transfer lines will be exposed. Current Interim Stabilization Program planning forecasts that the at-grade transfer lines will be required to convey pumpable waste for as much as three years after commissioning. Prudent engineering dictates that the equipment placed in service have a working life in excess of this forecasted time period, with some margin to allow for future adjustments to the planned schedule. This document evaluates the effective service life of the Hose-in-Hose Transfer Lines, based on information submitted by the manufacturer and published literature. The effective service life of transfer line assemblies is a function of several factors. Foremost among these are process fluid characteristics, ambient environmental conditions, and the manufacturer's stated shelf life. This evaluation examines the manufacturer's certification of shelf life, the manufacturer's certifications of chemical compatibility with waste, and published literature on the effects of exposure to ionizing radiation on the mechanical properties of elastomeric materials to evaluate transfer line service life

  6. A Life Dedicated to Public Service: The Lady L Story

    Directory of Open Access Journals (Sweden)

    Maribeth P. Bentillo

    2016-05-01

    Full Text Available This study featured how a lady local politician rose to power as a barangay captain. It aimed to: describe her leadership orientation before she became a barangay captain, analyze the factors of her success stories in political leadership, extrapolate her values based on the problems/challenges met in the barangay, unveil her initiatives to address these problems, and interpolate her enduring vision for the future of the barangay. Through a biographical research design, with purposive sampling, a key female informant named as Lady L was chosen with the sole criteria of being a female Barangay Captain of Cebu City. Interview guides were utilized in the generation of Lady L’s biographic information about her political career.Lady L’s experiences in waiting for the perfect time and working in the private sector destined her to have a successful political career enhanced with passion and family influence. Encountering problems concerning basic education and unwanted migrants in Barangay K did not discourage her choice to run for re-election, because of her dedication to public service. Her ways to reach out and collaborate with welfare groups mitigate the problems of parental neglect and informal settlers in her barangay. The story of Lady L implies that in Cebu City, issues arise as a result of the practice of partisan politics, gender issues have minor bearing, and she envisioned a healthy and welleducated barangay, with an improved wellness and child care development.

  7. Inflatable door seals - reduced maintenance and longer service-life

    International Nuclear Information System (INIS)

    Kuran, S.; Wensel, R.; Lazic, M.

    1995-01-01

    Inflatable door seals, designed more than a quarter of a century ago, have given good service in Canadian and overseas CANDU reactors. These thin-walled elastomeric seals have been exposed to many thousands of cycles of inflation and deflation, various types of aging (temperature, radiation and time), ozone degradation, abrasion, pinching, stiction, cracking and installation damage. The fact that they have operated successfully as part of the reactor building containment structure - subjected to the same pressures and temperatures as those for the thick reinforced concrete walls and steel doors highlights the achievement of these thin rubber seals. However, in the last decade, the rubber industry has developed new compounds that are more resistant to radiation, temperature, and time-dependent aging. Components manufactured from such compounds are less prone to hardening, stress cracking and permanent set; thereby saving on replacement costs, inventory and overall maintenance. This paper discusses development and testing of recent material and design changes to inflatable seals, and addresses various practical issues faced by the operations engineers and maintainers using these seals. (author)

  8. Accounting for ecosystem services in life cycle assessment, Part I: a critical review.

    Science.gov (United States)

    Zhang, Yi; Singh, Shweta; Bakshi, Bhavik R

    2010-04-01

    If life cycle oriented methods are to encourage sustainable development, they must account for the role of ecosystem goods and services, since these form the basis of planetary activities and human well-being. This article reviews methods that are relevant to accounting for the role of nature and that could be integrated into life cycle oriented approaches. These include methods developed by ecologists for quantifying ecosystem services, by ecological economists for monetary valuation, and life cycle methods such as conventional life cycle assessment, thermodynamic methods for resource accounting such as exergy and emergy analysis, variations of the ecological footprint approach, and human appropriation of net primary productivity. Each approach has its strengths: economic methods are able to quantify the value of cultural services; LCA considers emissions and assesses their impact; emergy accounts for supporting services in terms of cumulative exergy; and ecological footprint is intuitively appealing and considers biocapacity. However, no method is able to consider all the ecosystem services, often due to the desire to aggregate all resources in terms of a single unit. This review shows that comprehensive accounting for ecosystem services in LCA requires greater integration among existing methods, hierarchical schemes for interpreting results via multiple levels of aggregation, and greater understanding of the role of ecosystems in supporting human activities. These present many research opportunities that must be addressed to meet the challenges of sustainability.

  9. A Review of Perspectives on Frameworks for Ethical Theories in Public Service Life

    Directory of Open Access Journals (Sweden)

    Deoram Sing

    2016-06-01

    Full Text Available Given the dynamic and changing interwoven and intertwined internal and external environments impacting on public service life, establishing and promoting a proper ethical foundation in public service life, has in itself emerged as a profound and daunting challenge, a worldwide phenomenon. The role of frameworks for ethical theories  –  such as teleological, deontological, virtue-based, and learning and growth, is crucial to dealing with this challenge. It is the view of the author that a keen grasp and application of the various frameworks, as well as their various components, could project their viewing and that of their components, not in isolation, but in an interconnected and intertwined manner. This could enhance the clarification of ethical and moral alternatives, as well as facilitate the spreading and diffusion of techniques for ethical reasoning and moral awareness, throughout public service life.

  10. Simulating the service life performance of an inspected group of jacket-type structures

    DEFF Research Database (Denmark)

    Schneider, Ronald; Thöns, Sebastian; Rogge, Andreas

    2017-01-01

    and risk. We intend to adopt this approach to optimize inspection, monitoring and repair activities for offshore wind park support structures. As a first step, we simulate – in analogy to an offshore wind park – the service life performance of an inspected group of jacket-type frames. The performance......A novel method for risk-based optimization of inspection and repair strategies for deteriorating structural systems has recently been proposed. The method defines heuristics at the system level to reduce the number of possible strategies. For each defined strategy, it computes the updated system...... failure probability conditional on simulated inspection and repair histories, and evaluates the associated costs and risk. The expected total service life costs and risk for a strategy are finally determined using Monte Carlo simulation. The optimal strategy minimizes the expected total service life costs...

  11. Development of laboratory acceleration test method for service life prediction of concrete structures

    International Nuclear Information System (INIS)

    Cho, M. S.; Song, Y. C.; Bang, K. S.; Lee, J. S.; Kim, D. K.

    1999-01-01

    Service life prediction of nuclear power plants depends on the application of history of structures, field inspection and test, the development of laboratory acceleration tests, their analysis method and predictive model. In this study, laboratory acceleration test method for service life prediction of concrete structures and application of experimental test results are introduced. This study is concerned with environmental condition of concrete structures and is to develop the acceleration test method for durability factors of concrete structures e.g. carbonation, sulfate attack, freeze-thaw cycles and shrinkage-expansion etc

  12. Determination of service lives under varying loading using a life-fraction rule. Pt. 1

    International Nuclear Information System (INIS)

    Schaefer, L.

    1986-01-01

    Previously the attempt has been made to improve the often accuracy of the life-fraction rule (Robinson), applied to calculate the service lives under varying loading, by introducing constants into the mathematical representation of the rule which take into account the influence of the material and the conditions of loading. Therefore, the calculated service lives are not real predictions. In this work description based on constants is dispensed with and only one boundary condition is indicated for the life-fraction rule which is necessary and sufficient to calculate correctly any fractional damage and hence any service life under varying loading. The abbreviated wording of this boundary condition is: To calculate a fractional damage, the life fraction tsub(i) must be devided by a service life tsub(m,i), the structural condition Gsub(i) being the same. The specimen (X10NiCrTi1616 steel) will rupture as soon as the sum of fractional damages has attained unity: Σsub(i)(tsub(i)/tsub(m,i)) sub(Gsub(i)) = 1. (orig./GSCH)

  13. Place of Death and Use of Health Services in the Last Year of Life

    OpenAIRE

    Grande, Gunn E.; McKerral, Angela; Addington-Hall, Julia M.; Todd, Chris J.

    2003-01-01

    Aim: To investigate whether health service input in the last year of life differs between cancer patients who die at home versus those dying in inpatient care. Methods: Post hoc exploratory case-control study of 127 home deaths and 200 inpatient deaths. Retrospective electronic record linkage of patients' community and inpatient care during the last year of life. Results: Patients who died at home began their home nursing care closer to death than those who died as inpatients. Their first con...

  14. Integrating mental health services into primary HIV care for women: the Whole Life project.

    OpenAIRE

    Dodds, Sally; Nuehring, Elane M.; Blaney, Nancy T.; Blakley, Theresa; Lizzotte, Jean-Marie; Lopez, Myriam; Potter, JoNell E.; O'Sullivan, Mary J.

    2004-01-01

    The high rate of mental health problems in HIV-infected women jeopardizes the health of this vulnerable population, and constitutes a mandate for integrating mental health services into HIV primary care. The Whole Life project-a collaboration of the departments of Psychiatry and Obstetrics/Gynecology at the University of Miami School of Medicine-successfully integrated mental health services into primary HIV care for women. This article describes the conceptual framework of the integration, i...

  15. Methodologies for assessment of the service life of pressure tubes in Indian PHWRs

    International Nuclear Information System (INIS)

    Sinha, R.K.; Sharma, A.; Madhusoodanan, K.; Sinha, S.K.; Malshe, U.D.

    1997-01-01

    For estimating safe service life of pressure tubes in Indian PHWRs, analytical methodologies have been developed to evaluate creep deformation, deuterium pick-up rate, blister growth at cold spot, and operating domain required for achieving leak-before-break. The paper provides an overview of these methodologies, and results of some studies carried out towards evolution of proposed fitness-for-service criteria for a pressure tube in contact with its calandria tube. (author)

  16. Influence of coating quality on the service life of land-based gas turbine blades

    Energy Technology Data Exchange (ETDEWEB)

    Cheruvu, N.S. [Southwest Research Institute, San Antonio (United States)

    2007-06-15

    The land-based gas turbine blades operate at severe operating conditions: higher metal temperatures and stresses, and severe duty cycles. Metallic coatings with or without a top ceramic coating have been used to protect the turbine blades. The durability of the coating system is one of the prime life-limiting factors of modem gas turbine blades. The quality of the coating plays a critical role on the coating life. This paper discusses the failure mechanisms of the coatings and describes how the quality of the coating affects the service life of a gas turbine blade. A few case studies are presented in the paper. (orig.)

  17. Services and Supports, Partnership, and Family Quality of Life: Focus on Deaf-Blindness

    Science.gov (United States)

    Kyzar, Kathleen B.; Brady, Sara E.; Summers, Jean Ann; Haines, Shana J.; Turnbull, Ann P.

    2016-01-01

    In this study, the authors examined the moderating effects of partnership on the relationship between services and supports adequacy and family quality of life (FQOL) for families of children with deaf-blindness ages birth to 21. A social-ecological approach enabled examining the impact of disability on the family system. A survey, consisting of…

  18. Remediating cultural services in Second Life: The case of Info Island DK

    DEFF Research Database (Denmark)

    Heilesen, Simon

    2009-01-01

    In 2007, Info Island DK was created as a virtual library in Second Life. This is an account of how library services of the physical library and the net library were remediated into a 3-D virtual world. The Info Island DK library was not widely adopted by any of the intended target groups, even if...

  19. Impact of Child Life Services on Children and Families Admitted to Start the Ketogenic Diet.

    Science.gov (United States)

    Kossoff, Eric H; Sutter, Lindsay; Doerrer, Sarah C; Haney, Courtney A; Turner, Zahava

    2017-08-01

    Traditionally the ketogenic diet is started as an inpatient admission to the hospital. Starting in January 2015, child life services were made formally available during ketogenic diet admissions to help families cope. One-page surveys were then provided to 15 parents on the day of discharge and again after 3 months. Every family believed that the child life services were helpful. Children who were developmentally appropriate/mildly delayed had higher parent-reported anxiety scores than those who were moderate to severely delayed (4.4 vs 1.0, P = .02). At 3 months, child life services were deemed very helpful for the parents (mean score: 8.9, range: 5-10), and were more helpful for the parent than the child (mean 6.2, range 1-10, P = .047). One of the most helpful services was a prior phone call to parents 1 week prior. In this small pilot study, child life involvement during the start of the ketogenic diet was highly useful.

  20. On the need for data for the verification of service life models for frost damage

    DEFF Research Database (Denmark)

    Geiker, Mette Rica; Engelund, Sven

    1999-01-01

    The purpose of this paper is to draw the attention to the need for the verification of service life models for frost attack on concrete and the collection of relevant data. To illustrate the type of data needed the paper presents models for internal freeze/thaw damage (internal cracking including...

  1. Web-service architecture for tools supporting life-long e-Learning platforms

    NARCIS (Netherlands)

    Dimov, Alexander; Stefanov, Krassen

    2009-01-01

    Dimov, A., & Stefanov, K. (2008). Web-service architecture for tools supporting life-long e-Learning platforms. In R. Koper, K. Stefanov & D. Dicheva (Eds.), Proceedings of the 5th International TENCompetence Open Workshop "Stimulating Personal Development and Knowledge Sharing" (pp. 67-71).

  2. Advanced aircraft service life monitoring method via flight-by-flight load spectra

    Science.gov (United States)

    Lee, Hongchul

    This research is an effort to understand current method and to propose an advanced method for Damage Tolerance Analysis (DTA) for the purpose of monitoring the aircraft service life. As one of tasks in the DTA, the current indirect Individual Aircraft Tracking (IAT) method for the F-16C/D Block 32 does not properly represent changes in flight usage severity affecting structural fatigue life. Therefore, an advanced aircraft service life monitoring method based on flight-by-flight load spectra is proposed and recommended for IAT program to track consumed fatigue life as an alternative to the current method which is based on the crack severity index (CSI) value. Damage Tolerance is one of aircraft design philosophies to ensure that aging aircrafts satisfy structural reliability in terms of fatigue failures throughout their service periods. IAT program, one of the most important tasks of DTA, is able to track potential structural crack growth at critical areas in the major airframe structural components of individual aircraft. The F-16C/D aircraft is equipped with a flight data recorder to monitor flight usage and provide the data to support structural load analysis. However, limited memory of flight data recorder allows user to monitor individual aircraft fatigue usage in terms of only the vertical inertia (NzW) data for calculating Crack Severity Index (CSI) value which defines the relative maneuver severity. Current IAT method for the F-16C/D Block 32 based on CSI value calculated from NzW is shown to be not accurate enough to monitor individual aircraft fatigue usage due to several problems. The proposed advanced aircraft service life monitoring method based on flight-by-flight load spectra is recommended as an improved method for the F-16C/D Block 32 aircraft. Flight-by-flight load spectra was generated from downloaded Crash Survival Flight Data Recorder (CSFDR) data by calculating loads for each time hack in selected flight data utilizing loads equations. From

  3. Health-Related Quality of Life of Rural Clients Seeking Telepsychology Services

    Directory of Open Access Journals (Sweden)

    Kevin R. Tarlow

    2014-01-01

    Full Text Available Sixty million US residents live in rural areas, but health policies and interventions developed from an urban mindset often fail to address the significant barriers to health experienced by these local communities. Telepsychology, or psychological services delivered by distance via technology, is an emerging treatment modality with special implications for underserved rural areas. This study found that a sample of rural residents seeking telepsychology services (n=94 had low health-related quality of life (HRQOL, often due to cooccurring physical and mental health diagnoses including high rates of depression. However, a brief telepsychology treatment delivered to rural clients (n=40 was associated with an improvement in mental health-related quality of life (d = 0.70,  P<.001. These results indicate that despite the complex health needs of these underserved communities, telepsychology interventions may help offset the disparities in health service access in rural areas.

  4. The development of socially responsible life-sciences teachers through community service learning.

    Directory of Open Access Journals (Sweden)

    J.J. Rian de Villiers

    2012-03-01

    Full Text Available In South Africa, polices in higher education are urging tertiary institutions to produce graduates who are socially responsible citizens. One method of achieving this is through service-learning initiatives. Zoos as community partners can provide exciting educational opportunities for students to do animal behaviour studies and to develop their social responsibility. A sample of 58 preservice life-sciences teachers from a South African university completed a questionnaire on their animal behaviour studies. This study sought to determine how animal behaviour studies could successfully be incorporated as a community service-learning project in a zoo setting, what the educational value of these studies was and what the benefits were of incorporating this community service-learning component in the life-sciences course. The incorporation of the service-learning component into the zoology course led to the students’ personal and professional development, knowledge about themselves, sensitivity to cultural diversity, civic responsibility and insights into the ways in which communities operate. For a successful service-learning project, lectures, students and community partners should all have a sense of engagement. A number of suggestions are made to improve the incorporation of this service-learning component into the existing zoology course.

  5. Residential immersive life skills programs for youth with disabilities: service providers' perceptions of change processes.

    Science.gov (United States)

    King, Gillian; McPherson, Amy; Kingsnorth, Shauna; Stewart, Debra; Glencross-Eimantas, Tanya; Jones-Galley, Kimberlea; Morrison, Andrea; Isihi, Ana Maria; Gorter, Jan Willem

    2015-05-01

    Residential immersive life skills (RILS) programs are designed to equip youth with physical disabilities with the foundational life skills required to assume adult roles. The objective was to determine RILS service providers' perceptions of the active ingredients of the intervention change process. Thirty-seven service providers from various disciplines completed measures to assess expertise status and participated in qualitative interviews. Qualitative themes were derived, and similarities and differences in themes were identified for blinded groups of novices, intermediates, and experts. The three main themes, reflecting change processes, were: (a) creating a supportive program atmosphere with multiple opportunities for learning, (b) using strategies to support, encourage, and engage youth, and (c) intentionally fostering youth experiences of skill development, social interaction, and pride in accomplishment. In contrast to the novices, experts displayed a more holistic perspective and paid attention to higher-order issues such as providing opportunities and enabling youth. The findings indicate how RILS service providers work to create a program atmosphere and employ strategies to intentionally foster particular youth experiences. The findings explicate service providers' theories of practice, the intentional design of RILS program environments to bring about client change, and the value of service provider expertise. Implications for Rehabilitation Service providers of youth independence-oriented life skills programs can intentionally create a learning-oriented and supportive program atmosphere by using non-directive, coaching/guiding, and engagement strategies Youth experiences of skill development, shared experience with others, and pride in accomplishment can be cultivated by providing a range of learning opportunities, including choice making, problem-solving, and skill mastery Compared to more novice service providers, experts discussed managing the

  6. Evaluation of Hose in Hose Transfer Line Service Life for Hanfords Interim Stabilization Program

    International Nuclear Information System (INIS)

    TORRES, T.D.

    2001-01-01

    RPP-6153, Engineering Task Plan for Hose-in-Hose Transfer System for the Interim Stabilization Program (Torres, 2000a), defines the programmatic goals, functional requirements, and technical criteria for the development and subsequent installation of waste transfer line equipment to support Hanford's Interim Stabilization Program. RPP-6028, Specification for Hose in Hose Transfer Lines for Hanford's Interim Stabilization Program (Torres, 2000b), has been issued to define the specific requirements for the design, manufacture, and verification of transfer line assemblies for specific waste transfer applications associated with Interim Stabilization. Included in RPP-6028 are tables defining the chemical constituents of concern to which transfer lines will be exposed. Current Interim Stabilization Program planning forecasts that the at-grade transfer lines will be required to convey pumpable waste for as much as three years after commissioning, RPP-6028 Section 3.2.7. Performance Incentive Number ORP-05 requires that all the Single Shell Tanks be Interim Stabilized by September 30, 2003. The Tri-Party Agreement (TPA) milestone M-41-00, enforced by a federal consent decree, requires all the Single Shell Tanks to be Interim stabilized by September 30, 2004. By meeting the Performance Incentive the TPA milestone is met. Prudent engineering dictates that the equipment used to transfer waste have a life in excess of the forecasted operational time period, with some margin to allow for future adjustments to the planned schedule. This document evaluates the effective service life of the Hose-in-Hose Transfer Lines, based on information submitted by the manufacturer, published literature and calculations. The effective service life of transfer line assemblies is a function of several factors. Foremost among these are the hose material's resistance to the harmful effects of process fluid characteristics, ambient environmental conditions, exposure to ionizing radiation and the

  7. The Efficacy of Psychosocial Occupational Therapy Services on Quality of life of Chronic Pschiatric Patents

    Directory of Open Access Journals (Sweden)

    Elaheh Hojjati-Abed

    2010-04-01

    Full Text Available Objective: Quality of life has recently been recognized as an important goal of health care in psychiatry. In this study quality of life of chronic psychiatric patients was evaluated after psychosocial occupational therapy interventions. Materials & Methods: This study is interventional and quasi experimental. Twoenty four chronic mental patients who had refered to SINA Daily Center as intervention group and fifty chronic mental patients as control group were selected by simle and convenient sampling. The instrument was Wisconsin Quality of Life Client Questionnaire that included 8 subscales. Occupational therapy services consisting group therapy, activity therapy and art therapy, according to center’ plane, were performed during 3 months (2 times in week, 90 minutes in each session for intervention group. Independent T test & Paired T test were used for data analysis. Results: There was no significant difference between two groups in parts of QOL before intervention, but after intervention, significant differences were observed in mean scores of satisfaction level, occupational activities, psychological well–being, physical health and total quality o life (P<0.001, also social relation (P=0.005 and economic situation (P=0.003.There was no significant difference between two group in symptoms (P=0.277 and activity of daily living (P=0.020 after intervention. Conclusion: Psychosocial occupational therapy services are effective on satisfaction level and quality of life of chronic psychiatric patients.

  8. Automatically exposing OpenLifeData via SADI semantic Web Services.

    Science.gov (United States)

    González, Alejandro Rodríguez; Callahan, Alison; Cruz-Toledo, José; Garcia, Adrian; Egaña Aranguren, Mikel; Dumontier, Michel; Wilkinson, Mark D

    2014-01-01

    Two distinct trends are emerging with respect to how data is shared, collected, and analyzed within the bioinformatics community. First, Linked Data, exposed as SPARQL endpoints, promises to make data easier to collect and integrate by moving towards the harmonization of data syntax, descriptive vocabularies, and identifiers, as well as providing a standardized mechanism for data access. Second, Web Services, often linked together into workflows, normalize data access and create transparent, reproducible scientific methodologies that can, in principle, be re-used and customized to suit new scientific questions. Constructing queries that traverse semantically-rich Linked Data requires substantial expertise, yet traditional RESTful or SOAP Web Services cannot adequately describe the content of a SPARQL endpoint. We propose that content-driven Semantic Web Services can enable facile discovery of Linked Data, independent of their location. We use a well-curated Linked Dataset - OpenLifeData - and utilize its descriptive metadata to automatically configure a series of more than 22,000 Semantic Web Services that expose all of its content via the SADI set of design principles. The OpenLifeData SADI services are discoverable via queries to the SHARE registry and easy to integrate into new or existing bioinformatics workflows and analytical pipelines. We demonstrate the utility of this system through comparison of Web Service-mediated data access with traditional SPARQL, and note that this approach not only simplifies data retrieval, but simultaneously provides protection against resource-intensive queries. We show, through a variety of different clients and examples of varying complexity, that data from the myriad OpenLifeData can be recovered without any need for prior-knowledge of the content or structure of the SPARQL endpoints. We also demonstrate that, via clients such as SHARE, the complexity of federated SPARQL queries is dramatically reduced.

  9. Effect of the Length of Traffic Flow Records on the Estimate of a Bridge Service Life

    Directory of Open Access Journals (Sweden)

    Krejsa Jan

    2016-12-01

    Full Text Available The service life of bridges is significantly affected by fatigue of used material induced by heavy vehicles. Therefore, precise determination of the vehicle weight is of crucial importance for the calculation of fatigue damage and the prediction of the bridge serviceability. This paper investigates accuracy of the determination of fatigue depending on the length of traffic flow recording. The presented data were obtained from the measurements carried out on a bridge of the Prague Highway Ring. The analysis reveals that the optimal length of traffic recording is about 30 days.

  10. International Space Station Bacteria Filter Element Post-Flight Testing and Service Life Prediction

    Science.gov (United States)

    Perry, J. L.; von Jouanne, R. G.; Turner, E. H.

    2003-01-01

    The International Space Station uses high efficiency particulate air (HEPA) filters to remove particulate matter from the cabin atmosphere. Known as Bacteria Filter Elements (BFEs), there are 13 elements deployed on board the ISS's U.S. Segment. The pre-flight service life prediction of 1 year for the BFEs is based upon performance engineering analysis of data collected during developmental testing that used a synthetic dust challenge. While this challenge is considered reasonable and conservative from a design perspective, an understanding of the actual filter loading is required to best manage the critical ISS Program resources. Thus testing was conducted on BFEs returned from the ISS to refine the service life prediction. Results from this testing and implications to ISS resource management are discussed. Recommendations for realizing significant savings to the ISS Program are presented.

  11. Influence of flexible pin for planets on service life of wind turbine gearboxes

    International Nuclear Information System (INIS)

    Park, Young Jun; Lee, Geun Ho; Nam, Yong Yun; Kim, Jeong Kil

    2012-01-01

    An overhung mounted carrier with flexible pins is applied to the planetary gear train of a wind turbine gearbox to investigate the influence of the self aligning effect by means of the deflection of the planet spindle and the flexible pin on the lifetime of the planet gear for a wind turbine gearbox. To analyze the load distribution of planet gears, both Euler theory and commercial software are employed. By applying an overhung mounted carrier with flexible pins in the wind turbine gearbox, we can improve the misalignment performance, face load factor, and service life of the planet gears. In particular, it was confirmed that a service life of more than 20 years could be realized for wind turbine gearboxes by applying a flexible pin to overhung mounted carrier

  12. Smallpox still haunts scientists: results of a questionnaire-based inquiry on the views of health care and life science experts and students on preserving the remaining variola virus stocks.

    Science.gov (United States)

    Srinivasan, Thangavelu; Dedeepiya, Vidyasagar Devaprasad; John, Sudhakar; Senthilkumar, Rajappa; Reena, Helen C; Rajendran, Paramasivam; Balamurugan, Madasamy; Kurosawa, Gene; Iwasaki, Masaru; Preethy, Senthilkumar; Abraham, Samuel J K

    2013-01-01

    The World Health Organization (WHO) declared eradication of the dreadful disease "smallpox" in 1980. Though the disease has died down, the causative virus "variola" has not, as it has been well preserved in two high security laboratories-one in USA and another in Russia. The debate on whether the remaining stocks of the smallpox virus should be destroyed or not is ongoing, and the World Health Assembly (WHA) in 2011 has decided to postpone the review on this debate to the 67th WHA in 2014. A short questionnaire-based inquiry was organized during a one-day stem cell meeting to explore the views of various health care and life science specialists especially students on this aspect. Among the 200 participants of the meeting, only 66 had answered the questionnaire. 60.6% of participants who responded to the questionnaire were for preserving the virus for future reference, while 36.4% of the participants were for destroying the virus considering the magnitude with which it killed millions. However, 3% of the respondents were not able to decide on any verdict. Therefore, this inquiry expresses the view that "what we cannot create, we do not have the right to destroy."

  13. Remaining Useful Life Estimation of Insulated Gate Biploar Transistors (IGBTs Based on a Novel Volterra k-Nearest Neighbor Optimally Pruned Extreme Learning Machine (VKOPP Model Using Degradation Data

    Directory of Open Access Journals (Sweden)

    Zhen Liu

    2017-11-01

    Full Text Available The insulated gate bipolar transistor (IGBT is a kind of excellent performance switching device used widely in power electronic systems. How to estimate the remaining useful life (RUL of an IGBT to ensure the safety and reliability of the power electronics system is currently a challenging issue in the field of IGBT reliability. The aim of this paper is to develop a prognostic technique for estimating IGBTs’ RUL. There is a need for an efficient prognostic algorithm that is able to support in-situ decision-making. In this paper, a novel prediction model with a complete structure based on optimally pruned extreme learning machine (OPELM and Volterra series is proposed to track the IGBT’s degradation trace and estimate its RUL; we refer to this model as Volterra k-nearest neighbor OPELM prediction (VKOPP model. This model uses the minimum entropy rate method and Volterra series to reconstruct phase space for IGBTs’ ageing samples, and a new weight update algorithm, which can effectively reduce the influence of the outliers and noises, is utilized to establish the VKOPP network; then a combination of the k-nearest neighbor method (KNN and least squares estimation (LSE method is used to calculate the output weights of OPELM and predict the RUL of the IGBT. The prognostic results show that the proposed approach can predict the RUL of IGBT modules with small error and achieve higher prediction precision and lower time cost than some classic prediction approaches.

  14. A Comparison of Quality of Life Outcomes for People with Intellectual Disabilities in Supported Employment, Day Services and Employment Enterprises

    Science.gov (United States)

    Beyer, Stephen; Brown, Tony; Akandi, Rachel; Rapley, Mark

    2010-01-01

    Background: Policy objectives for people with intellectual disabilities include day service modernization and the promotion of paid employment and quality of life. Quality of life is under represented as an outcome measure in vocational research. This research compares subjective and objective quality of life, and quality of work environment for…

  15. Advances in Modeling Concrete Service Life : Proceedings of 4th International RILEM PhD Workshop

    CERN Document Server

    Gulikers, Joost

    2012-01-01

    In this book, a critical analysis is made on service life models related to reinforcement corrosion. The contributors are on the frontier of knowledge in the field of durability of reinforced concrete. Topics covered in the book include: causes and mechanisms of deterioration, transport mechanisms in concrete, numerical modeling of concrete behavior, durability modeling and prediction, reliability approach to structural design for durability, structural behavior following degradation of concrete structures, deterioration and repair of concrete structures, and corrosion measurement techniques.

  16. Laser shock peening of steam turbine blade for enhanced service life

    Indian Academy of Sciences (India)

    2014-02-13

    Feb 13, 2014 ... study to develop indigenous LSP process for enhanced service life ... DINX10Cr- 0.08–0.13 11.5–12.5 2.2–2.8 0.1–0.5 1.6–1.8 0.6–0.9 0.25–0.4 Balance ... LSP is done by scanning the taped surface of the work piece with a ...

  17. Should the service life of nuclear power plants be limited for technical reasons?

    International Nuclear Information System (INIS)

    Schomer, E.

    1995-01-01

    German nuclear power plant operating licenses take into account the fact that the design lifetime of the facilities is 40 years. The technological lifetime, however, is governed by actual ageing processes and operational burden. The service life of nuclear power plants can be extended by replacement of the steam generator and by repair or replacement of the reactor pressure vessel or parts thereof. Attention is also paid to the reactor protection systems. (J.B.). 8 figs

  18. Supporting family carers providing end-of-life home care: a qualitative study on the impact of a hospice at home service.

    Science.gov (United States)

    Jack, Barbara A; O'Brien, Mary R; Scrutton, Joyce; Baldry, Catherine R; Groves, Karen E

    2015-01-01

    To explore bereaved family carers' perceptions and experiences of a hospice at home service. The increasing demand for the development of home-based end-of-life services is not confined to the western world; such services are also emerging in resource-poor countries where palliative care services are developing with limited inpatient facilities. Despite this growing trend, studies show a variety of interrelated factors, with an emphasis on the availability of informal carers and their ability to cope, which can influence whether terminally ill patients actually remain at home. A hospice at home service was developed to meet patients' and families' needs by providing individually tailored resources. A qualitative study. Data were collected by semi-structured, digitally recorded interviews from 20 family carers who had experienced the service. Interviews were transcribed verbatim and a thematic approach adopted for analysis. All participants reported a personal positive impact of the service. Family carers commented the service provided a valued presence, they felt in good hands and importantly it helped in supporting normal life. The impact of an individualised, targeted, hospice at home service using dedicated, palliative care trained, staff, is perceived positively by family carers and importantly, supportive of those with additional caring or employment commitments. The emergence of hospice at home services has resulted in more options for patients and their families, when the increased amount of care a family member has to provide in these circumstances needs to be adequately supported, with the provision of a flexible service tailored to individual needs and delivered by appropriately trained staff. © 2014 The Authors. Journal of Clinical Nursing Published by John Wiley & Sons Ltd.

  19. Reactor Dosimetry Aspects of the Service Life Extension of the Hungarian Paks NPP

    Directory of Open Access Journals (Sweden)

    Zsolnay Eva M.

    2016-01-01

    Full Text Available The service life of the Hungarian Paks Nuclear Power Plant (NPP will be extended from the originally planned 30 years to 50 years. To improve the reliability of the results obtained in frame of the old reactor pressure vessel (RPV surveillance programme, new methods have been developed, and based on them, the old exposition data have been re-evaluated for all the four reactor units. At the same time, a new RPV surveillance programme has been developed and introduced, and long term irradiations have been performed to determine the radiation damage of the surveillance specimens due to the high fast neutron exposition. Neutron transport calculations have been performed with a validated neutron transport code system to determine the fast neutron exposition of the RPVs during the extended service life. The cavity dosimetry is in the introductory phase. This paper presents the new developments in the field of the RPV surveillance dosimetry and summarises the results obtained. According to the results the service life of the NPP can safely be extended for the planned 50 years.

  20. Impact of landfill liner time-temperature history on the service life of HDPE geomembranes.

    Science.gov (United States)

    Rowe, R Kerry; Islam, M Z

    2009-10-01

    The observed temperatures in different landfills are used to establish a number of idealized time-temperature histories for geomembrane liners in municipal solid waste (MSW) landfills. These are then used for estimating the service life of different HDPE geomembranes. The predicted antioxidant depletion times (Stage I) are between 7 and 750 years with the large variation depending on the specific HDPE geomembrane product, exposure conditions, and most importantly, the magnitude and duration of the peak liner temperature. The higher end of the range corresponds to data from geomembranes aged in simulated landfill liner tests and a maximum liner temperature of 37 degrees C. The lower end of the range corresponds to a testing condition where geomembranes were immersed in a synthetic leachate and a maximum liner temperature of 60 degrees C. The total service life of the geomembranes was estimated to be between 20 and 3300 years depending on the time-temperature history examined. The range illustrates the important role that time-temperature history could play in terms of geomembrane service life. The need for long-term monitoring of landfill liner temperature and for geomembrane ageing studies that will provide improved data for assessing the likely long-term performance of geomembranes in MSW landfills are highlighted.

  1. Evaluation of Service Life of Polystyrene in Tropical Marine Environment by Principal Component Analysis

    Directory of Open Access Journals (Sweden)

    Dongdong Song

    2015-01-01

    Full Text Available To predict the service life of polystyrene (PS under an aggressive environment, the nondimensional expression Z was established from a data set of multiple properties of PS by principal component analysis (PCA. In this study, PS specimens were exposed to the tropical environment on Xisha Islands in China for two years. Chromatic aberration, gloss, tensile strength, elongation at break, flexural strength, and impact strength were tested to evaluate the aging behavior of PS. Based on different needs of industries, each of the multiple properties could be used to evaluate the service life of PS. However, selecting a single performance variation will inevitably hide some information about the entire aging process. Therefore, finding a comprehensive measure representing the overall aging performance of PS can be highly significant. Herein, PCA was applied to obtain a specific property (Z which can represent all properties of PS. Z of PS degradation showed a slight decrease for the initial two months of exposure after which it increased rapidly in the next eight months. Subsequently, a slower increase of Z value was observed. From the three different stages shown as Z value increases, three stages have been identified for PS service life.

  2. Strategies for the improvement of quality of life and service at the wellsite

    International Nuclear Information System (INIS)

    Lombardo, G.J.; McCants, K.J.; Klein, M.

    1991-01-01

    The oil industry, particularly exploration and production drilling has always had to contend with a remarkable set of conditions: complicated logistics, remote locations, twenty four hour daily operations, and long and uneven schedules, to mention only a few. Invariably, operations personnel particularly service company personnel are required to perform highly technical, often critical tasks for long periods of time without the benefit of sustained periods of restfulness. This condition is compounded by irregular days-off schedules and the offshore environment itself. Research in other industries has shown that scheduling conditions similar to those experienced in the E and P drilling industry have lowered the standard of life, general health, safety and performance of employees. With the move towards higher technology and even more critical tasks, more demanding employees and an essentially unchanged working environment, the problems are compounded even further. Work related stress and quality of life have become important factors in our employees' career decisions and their ability to work safely. This paper discusses the evaluation of the work schedule and work/living conditions of the wellsite measurement and services personnel of Anadrill Schlumberger, and concludes with methods to improve the safety, health and general quality of life of those personnel and the service quality they can deliver

  3. Analysis and modeling of hot extrusion die for its service life enhancement

    Science.gov (United States)

    Akhtar, Syed Sohail

    Aluminum extrusion finds extensive application in the construction, automobile and aerospace industries. High pressures, elevated temperatures, complex and intricate section geometries lead to repeated mechanical and thermal stresses in the die and affiliated tooling. Product rework and rejects can be traced back to various defects spread over the die life cycle: die design, die manufacture and heat treatment, process parameters, inprocess die maintenance/correction and, billet type and quality. Therefore, improved and efficient service life of die and related tooling used in the extrusion press is one the most important factors in maximizing productivity and minimizing cost for ensuring the economical efficiency of an aluminum extrusion plant. How often a die has to be scrapped and replaced with a new one directly contributes to the commercial viability of producing a certain profile. The focus of the current work is on three distinct yet inter-related studies pertaining to the improvement of aluminum extrusion die. Study-A (Die Failure Analysis) is an investigation of various modes and critical failure types based on industrial data (Chapter-2 ), examination of failed dies and finite element simulation for identification of critical process parameters and design features in die fatigue-life (Chapter-3). In Study-B (Die Surface Hardening Treatment), two-stage controlled gas nitriding process for H13 steel is evaluated, both experimentally and numerically, in terms of nitrided case morphology and properties (Chapter-4) followed by experimental and numerical investigation of the effects of repeated nitriding (Chapter-5), pre-nitriding surface preparation (Chapter-6) and die profile geometry (Chapter-7) on nitriding performance in regard to die service life. In Study-C (Effect of Billet Quality on Die Life), the effect of billet quality and related influencing extrusion parameters on the die service life is investigated based on industrial data and some regression

  4. The sustainability effects of Product/Service-System design validated through Life Cycle Assessment

    DEFF Research Database (Denmark)

    Smidt Dreijer, Leise; Birkved, Morten; Howard, Thomas J.

    2013-01-01

    and lifts. The major research question for the case is how the supplier’s continued ownership of the building materials influences the sustainability of such buildings. By using a PSS design approach in the early design stages, the architects involved in the case project were able to make design decisions......Temporary buildings are generally considered to be unsustainable due to a short life span of the materials applied in the building. The construction materials typically have a longer use life than the required use life of the building, thus functioning building materials are often discarded after...... the demolition. In an attempt to improve the sustainability of temporary buildings, a Product/Service-System (PSS) strategy is here applied to a case project. The case project concerns a temporary building made of leased materials and building components such as shipping containers, scaffolding materials...

  5. Impacts of Global Warming and Sea Level Rise on Service Life of Chloride-Exposed Concrete Structures

    Directory of Open Access Journals (Sweden)

    Xiao-Jian Gao

    2017-03-01

    Full Text Available Global warming will increase the rate of chloride ingress and the rate of steel corrosion of concrete structures. Furthermore, in coastal (atmospheric marine zones, sea level rise will reduce the distance of concrete structures from the coast and increase the surface chloride content. This study proposes a probabilistic model for analyzing the effects of global warming and sea level rise on the service life of coastal concrete structures. First, in the corrosion initiation stage, an improved chloride diffusion model is proposed to determine chloride concentration. The Monte Carlo method is employed to calculate the service life in the corrosion initiation stage; Second, in the corrosion propagation stage, a numerical model is proposed to calculate the rate of corrosion, probability of corrosion cracking, and service life. Third, overall service life is determined as the sum of service life in the corrosion initiation and corrosion propagation stages. After considering the impacts of global warming and sea level rise, the analysis results show that for concrete structures having a service life of 50 years, the service life decreases by about 5%.

  6. Determining Service Life of Respirator Cartridges Using a Simple and Practical Method: Case Study in a Car Manufacturing Industry

    Directory of Open Access Journals (Sweden)

    A.M Rashidi

    2012-01-01

    Full Text Available Background and aims: For ensuring about proper performance of air-purifying respirators in providing protection against workplace contaminants, it is necessary to change the respirator cartridges before the end of their service life. The aim of this study was determination of service life of organic vapor cartridges using a simple and practical method in a spray painting booth of a car manufacturing industry.   Methods: NIOSH MultiVapor software was used for estimating service life of respirator cartridges based on workplace conditions and cartridge specifications. Efficiency of determined service life was investigated using an apparatus for field testing of cartridges in the workplace.   Results: The results showed that existing schedule for changing the respirator cartridges is not effective and no longer provide adequate protection for sprayers against organic contaminants while working in a painting booth. It is necessary to change the cartridges before their estimated service life (every 4 hours.   Conclusion: NIOSH MultiVapor has acceptable efficiency for determining respirator cartridges service life and could be used as a simple and practical method in the workplace. Moreover, Service life estimated by this software was confirmed by cartridge field test apparatus.

  7. Mobile phone use for contacting emergency services in life-threatening circumstances.

    Science.gov (United States)

    Wu, Olivia; Briggs, Andrew; Kemp, Tom; Gray, Alastair; MacIntyre, Kate; Rowley, Jack; Willett, Keith

    2012-03-01

    The potential health benefits of mobile phone use have not been widely studied, except for telemedicine-type applications. This study seeks to determine whether initial contact with emergency services via a mobile phone in life-threatening situations is associated with potential health benefits when compared to contact via a landline. A record-linkage study was carried out in which data from all emergency dispatches for immediately life-threatening events from a United Kingdom county ambulance service were linked to the Patient Admission System at two major local hospitals. Mortality (at the scene, at the emergency department [ED], and during hospitalization); transfer to the ED; admission (inpatient care, and intensive care unit); and length of stay were analyzed for calls classified as Code Red (immediately life-threatening) by initial exposure (mobile phone vs. landline), while controlling for potential confounding variables. Of 354,199 ambulances dispatched to attend emergency incidents, 66% transported patients to the hospital while 2% stood down due to death at the scene. Mobile phone compared to landline reporting of emergencies resulted in significant reductions in the risk of death at the scene (odds ratio [OR] 0.77), but not for death in the ED or during inpatient admission. The risk of being transferred to the ED and subsequent inpatient admission were significantly lower with reporting from mobile phones compared to landline (OR 0.93 and OR 0.82, respectively). In this study, evidence of statistical association was demonstrated between the use of mobile phones to alert ambulance services in life-threatening situations and improved outcomes for patients. Copyright © 2012 Elsevier Inc. All rights reserved.

  8. Advanced medical life support procedures in vitally compromised children by a helicopter emergency medical service

    Directory of Open Access Journals (Sweden)

    Scheffer Gert J

    2010-03-01

    Full Text Available Abstract Background To determine the advanced life support procedures provided by an Emergency Medical Service (EMS and a Helicopter Emergency Medical Service (HEMS for vitally compromised children. Incidence and success rate of several procedures were studied, with a distinction made between procedures restricted to the HEMS-physician and procedures for which the HEMS is more experienced than the EMS. Methods Prospective study of a consecutive group of children examined and treated by the HEMS of the eastern region of the Netherlands. Data regarding type of emergency, physiological parameters, NACA scores, treatment, and 24-hour survival were collected and subsequently analysed. Results Of the 558 children examined and treated by the HEMS on scene, 79% had a NACA score of IV-VII. 65% of the children had one or more advanced life support procedures restricted to the HEMS and 78% of the children had one or more procedures for which the HEMS is more experienced than the EMS. The HEMS intubated 38% of all children, and 23% of the children intubated and ventilated by the EMS needed emergency correction because of potentially lethal complications. The HEMS provided the greater part of intraosseous access, as the EMS paramedics almost exclusively reserved this procedure for children in cardiopulmonary resuscitation. The EMS provided pain management only to children older than four years of age, but a larger group was in need of analgesia upon arrival of the HEMS, and was subsequently treated by the HEMS. Conclusions The Helicopter Emergency Medical Service of the eastern region of the Netherlands brings essential medical expertise in the field not provided by the emergency medical service. The Emergency Medical Service does not provide a significant quantity of procedures obviously needed by the paediatric patient.

  9. A simple method to prolong the service life of radioactive sources for external radiotherapy.

    Science.gov (United States)

    Xu, Yingjie; Tian, Yuan; Dai, Jianrong

    2014-07-08

    A radioactive source is usually replaced and disposed after being used for a certain amount of time (usually a half-life). In this study, a simple method is proposed to prolong its service life. Instead of replacing the used source with a new source of full activity, a new source of less activity is added in the source holder in front of the used one, so that the total activity of two sources is equal to the initial activity of the used source or even higher. Similarly, more sources can be added to the previous ones. Attenuation of front source(s) to the back source(s) was evaluated with exponential attenuation equation, and variation of source-focus distance (SFD) with inverse square law for Leksell 4C Gamma Knife, which served as an example of external radiotherapy units. When the number of front sources increased from 1 to 3, the relative air kerma decreased from 36.5% to 5.0%. Both the attenuation effect and SFD variation contributed to the decrease in air kerma, with the former being the major factor. If the height of the source can be decreased in some way, such as increasing the specific activity of sources, the sources can be used more efficiently. The method prolongs the service life of sources by several factors, and reduces the expense of source exchange and reclamation.

  10. Childhood adverse life events, disordered eating, and body mass index in US Military service members.

    Science.gov (United States)

    Bakalar, Jennifer L; Barmine, Marissa; Druskin, Lindsay; Olsen, Cara H; Quinlan, Jeffrey; Sbrocco, Tracy; Tanofsky-Kraff, Marian

    2018-03-02

    US service members appear to be at high-risk for disordered eating. Further, the military is experiencing unprecedented prevalence of overweight and obesity. US service members also report a high prevalence of childhood adverse life event (ALE) exposure. Despite consistent links between early adversity with eating disorders and obesity, there is a dearth of research examining the association between ALE exposure and disordered eating and weight in military personnel. An online survey study was conducted in active duty personnel to examine childhood ALE history using the Life Stressor Checklist - Revised, disordered eating using the Eating Disorder Examination - Questionnaire total score, and self-reported body mass index (BMI, kg/m 2 ). Among 179 respondents, multiple indices of childhood ALE were positively associated with disordered eating. Traumatic childhood ALE and subjective impact of childhood ALE were associated with higher BMI and these associations were mediated by disordered eating. Findings support evaluating childhood ALE exposure among service members with disordered eating and weight concerns. Moreover, findings support the need for prospective research to elucidate these relationships. © 2018 Wiley Periodicals, Inc.

  11. Adverse psychosocial working conditions and poor quality of life among financial service employees in Brazil.

    Science.gov (United States)

    Silva, Luiz Sergio; Barreto, Sandhi Maria

    2012-01-01

    Workers in the financial services sector are exposed to great stress at work. This study investigates whether exposure to adverse psychosocial work conditions is independently associated with poor health-related physical and mental quality of life among financial services workers. We studied a nationwide representative sample of 2,054 workers of a large Brazilian state bank in 2008. Adverse psychosocial work conditions were investigated by the Effort-reward imbalance (ERI) scale and the Job content questionnaire (JCQ). Health-related quality of life (HRQL) was assessed using the Medical Outcomes Study Short-Form General Health Survey (SF-12). Poor mental and physical HRQL was defined by the lowest quartiles of the SF-12 final score distributions. Associations were investigated using multiple logistic regression analysis. In the multivariate analysis, exposures to low control and lack of social support at work (JCQ) were associated with poor HRQL in the physical domain. Increasing effort-reward imbalance and overcommitment (ERI), on the other hand, were associated with poor HRQL in the mental domain, with a significant statistical trend. Overcommitment was also associated with poor physical HRQL. The results suggest that exposure to adverse psychosocial work conditions has a negative impact on both domains of HRQL among financial service workers. They also indicate that ERI and DC models capture different aspects of job strain.

  12. Second life battery energy storage system for residential demand response service

    DEFF Research Database (Denmark)

    Saez-de-Ibarra, Andoni; Martinez-Laserna, Egoitz; Koch-Ciobotaru, Cosmin

    2015-01-01

    vehicles, during their main first life application, for providing residential demand response service. The paper considers the decayed characteristics of these batteries and optimizes the rating of such a second life battery energy storage system (SLBESS) for maximizing the economic benefits of the user......The integration of renewable energies and the usage of battery energy storage systems (BESS) into the residential buildings opens the possibility for minimizing the electricity bill for the end-user. This paper proposes the use of batteries that have already been aged while powering electric......'s energy consumption during a period of one year. Furthermore, simulations were performed considering real data of PV generation, consumption, prices taken from the Spanish market and costs of battery and photovoltaic systems....

  13. Influence of Superheated Steam Temperature Regulation Quality on Service Life of Boiler Steam Super-Heater Metal

    Directory of Open Access Journals (Sweden)

    G. T. Kulakov

    2009-01-01

    Full Text Available The paper investigates influence of change in quality of superheated steam temperature regulations on service life of super-heater metal. А dependence between metal service life and dispersion value for different steel grades has been determined in the paper. Numerical values pertaining to increase of super-heater metal service life in case of transferring from manual regulation to standard system of automatic regulation (SAR have been determined and in case of transferring from standard SAR to improved SAR. The analysis of tabular data and plotted dependencies makes it possible to conclude that any change in conditions of convection super-heater metal work due to better quality of the regulation leads to essential increase of time period which is left till the completion of the service life of a super-heater heating surface.

  14. Internal curing as a new tool for infrastructural renewal : reducing repair congestion, increasing service life, and improving sustainability.

    Science.gov (United States)

    2014-04-01

    Internal curing has recently been developed as a new concrete technology that has the potential to : dramatically extend the service life of concrete infrastructure elements like bridge decks. Internal curing : uses prewetted lightweight aggregate in...

  15. Service life prediction for 50-year-old buildings in marine environments

    Directory of Open Access Journals (Sweden)

    Agustín Sánchez-Deza

    2018-03-01

    Full Text Available Steel reinforcing bars are often coated with rusts formed during service in reinforced concrete (RC structures. Rust layers growing on steel rebars induce expansive stresses and cause cracking on cover concrete. This study uses steel corrosion rate results measured on reinforced concrete buildings of more than 50 years of age located in marine environments and considers the pressure generated by the volume expansion of corrosion product layers to calculate the service life of the RC structures using a numerical simulation, estimating the time to corrosion cracking of the concrete cover. Akaganeite, goethite, lepidocrocite, hematite, magnetite and maghemite were identified by X-ray diffraction as crystalline phase constituents of the rust layers.

  16. On the application of thermodynamics of corrosion for service life design of concrete structures

    DEFF Research Database (Denmark)

    Küter, Andre; Geiker, Mette Rica; Møller, Per

    2010-01-01

    There are unexploited possibilities in the application of thermodynamics of corrosion for service life design (SLD) of concrete structures. Thermodynamics provides means for insightful descriptions of corrosion mechanisms and of corrosion protection mechanisms. Strategies for corrosion protection...... of the application of thermodynamics for SLD and gives examples of two applications: description of corrosion processes and design of countermeasures. Emphasis is set on chloride induced corrosion....... can be based on thermodynamically consistent corrosion mechanisms and evaluation of existing and design of new countermeasures can be performed using thermodynamics. Similarly, materials concepts for embedded electrodes can be designed using thermodynamics. The present paper provides a brief outline...

  17. A Numerical Model for Estimation of Service Life of Tribological Systems of the Piston Engine

    Directory of Open Access Journals (Sweden)

    K. Gavrilov

    2017-09-01

    Full Text Available This article describes, develops and applies approach of the interaction of rough surfaces for one of the tasks of simulation of tribological systems of the piston engine. In this paper we described the general approach to building a model of interaction between rough surfaces, leading to the analysis of the Markov process. Given the initial data and the method of calculating the trajectory of movable elements on the lubricating layer, we determined the tribological parameters defining the service life of tribological systems of the piston engine on the example of crankshaft bearings.

  18. Service Life Prediction of Wood Claddings by in-situ Measurement of Wood Moisture Content

    DEFF Research Database (Denmark)

    Engelund, Emil Tang; Lindegaard, Berit; Morsing, Niels

    2009-01-01

    of wood moisture are done by in-situ resistance moisture meters (Lindegaard and Morsing 2006). The aim is that the test should form the basis of evaluation of the maintenance requirements and the prediction of service life of the surface treatment and the wood/construction. At the moment 60 test racks...... are exposed. This study examines the data from the first five years of outdoor exposure using data from a test rack with a water-borne acrylic coating and a test rack with ICP coating for case studies. The moisture content data was converted into weekly average and weekly variation values which gave a deeper...

  19. Perceived stress and life satisfaction: social network service use as a moderator.

    Science.gov (United States)

    Niu, Qikun; Liu, Yihao; Sheng, Zitong; He, Yue; Shao, Xiaolin

    2011-01-01

    Social Network Service (SNS) has become a buzzword in recent media coverage with the development of the second generation of Web-based communities. In China, SNS has played an increasingly important role in its users' daily lives, especially among students. With a sample of 471 college students, we tested the direct relationship between perceived stress and life satisfaction using a regression analysis. Moreover, we found SNS use could buffer the negative effect of perceived stress. This study has practical implications on Internet users' SNS use.

  20. Estimation of the temporary service life of DC arc plasmatron cathode

    Science.gov (United States)

    Kulygin, V. M.; Pereslavtsev, A. V.; Tresvyatskii, S. S.

    2017-09-01

    The service life of the cathode of a DC arc plasmatron continuously working with tubular electrodes that operate in the air has been considered using the semi-phenomenological approach. The thermal emission, that ensures the necessary flow of electrons, and the evaporation of the cathode material, which determines its erosion, have been taken as the basic physical phenomena that constitute the workflow. The relationships that enable the estimation of the cathode's operating time have been obtained using the known regularities of these phenomena and experimental data available in the literature. The resulting evaluations coincide satisfactorily with the endurance test results.

  1. Colil: a database and search service for citation contexts in the life sciences domain.

    Science.gov (United States)

    Fujiwara, Toyofumi; Yamamoto, Yasunori

    2015-01-01

    To promote research activities in a particular research area, it is important to efficiently identify current research trends, advances, and issues in that area. Although review papers in the research area can suffice for this purpose in general, researchers are not necessarily able to obtain these papers from research aspects of their interests at the time they are required. Therefore, the utilization of the citation contexts of papers in a research area has been considered as another approach. However, there are few search services to retrieve citation contexts in the life sciences domain; furthermore, efficiently obtaining citation contexts is becoming difficult due to the large volume and rapid growth of life sciences papers. Here, we introduce the Colil (Comments on Literature in Literature) database to store citation contexts in the life sciences domain. By using the Resource Description Framework (RDF) and a newly compiled vocabulary, we built the Colil database and made it available through the SPARQL endpoint. In addition, we developed a web-based search service called Colil that searches for a cited paper in the Colil database and then returns a list of citation contexts for it along with papers relevant to it based on co-citations. The citation contexts in the Colil database were extracted from full-text papers of the PubMed Central Open Access Subset (PMC-OAS), which includes 545,147 papers indexed in PubMed. These papers are distributed across 3,171 journals and cite 5,136,741 unique papers that correspond to approximately 25 % of total PubMed entries. By utilizing Colil, researchers can easily refer to a set of citation contexts and relevant papers based on co-citations for a target paper. Colil helps researchers to comprehend life sciences papers in a research area more efficiently and makes their biological research more efficient.

  2. Physical-chemical purification of power metal optics for increasing its service life

    Science.gov (United States)

    Filin, S. A.; Rogalin, V. E.; Kaplunov, I. A.; Zingerman, K. M.

    2017-12-01

    In order to increase the resource of power metal optics, the features of the choice of solvents for its physical and chemical cleaning are investigated. During cleaning, on the contaminated surface there remain visually observed white film of alkali and alkaline earth metal salts, insoluble by this class of solvents, and iridescent bands from the interaction of hydrocarbons with metal, and this degrades optical properties and reduces the life of mirrors. It is demonstrated that, with the use of solvents, it is necessary to inhibit the interaction of hydrocarbons with mirrors by the stabilization of solvents or by selection of cleaning regimes.

  3. Accounting for ecosystem services in Life Cycle Assessment, Part II: toward an ecologically based LCA.

    Science.gov (United States)

    Zhang, Yi; Baral, Anil; Bakshi, Bhavik R

    2010-04-01

    Despite the essential role of ecosystem goods and services in sustaining all human activities, they are often ignored in engineering decision making, even in methods that are meant to encourage sustainability. For example, conventional Life Cycle Assessment focuses on the impact of emissions and consumption of some resources. While aggregation and interpretation methods are quite advanced for emissions, similar methods for resources have been lagging, and most ignore the role of nature. Such oversight may even result in perverse decisions that encourage reliance on deteriorating ecosystem services. This article presents a step toward including the direct and indirect role of ecosystems in LCA, and a hierarchical scheme to interpret their contribution. The resulting Ecologically Based LCA (Eco-LCA) includes a large number of provisioning, regulating, and supporting ecosystem services as inputs to a life cycle model at the process or economy scale. These resources are represented in diverse physical units and may be compared via their mass, fuel value, industrial cumulative exergy consumption, or ecological cumulative exergy consumption or by normalization with total consumption of each resource or their availability. Such results at a fine scale provide insight about relative resource use and the risk and vulnerability to the loss of specific resources. Aggregate indicators are also defined to obtain indices such as renewability, efficiency, and return on investment. An Eco-LCA model of the 1997 economy is developed and made available via the web (www.resilience.osu.edu/ecolca). An illustrative example comparing paper and plastic cups provides insight into the features of the proposed approach. The need for further work in bridging the gap between knowledge about ecosystem services and their direct and indirect role in supporting human activities is discussed as an important area for future work.

  4. Why Agricultural Educators Remain in the Classroom

    Science.gov (United States)

    Crutchfield, Nina; Ritz, Rudy; Burris, Scott

    2013-01-01

    The purpose of this study was to identify and describe factors that are related to agricultural educator career retention and to explore the relationships between work engagement, work-life balance, occupational commitment, and personal and career factors as related to the decision to remain in the teaching profession. The target population for…

  5. METHODS AND RESEARCH CONCERNING SERVICE LIFE EXTENSION OF SUPORTING STRUCTURES OF TRACTION ROLLING STOCK FOR INDUSTRIAL TRANSPORT

    Directory of Open Access Journals (Sweden)

    O. M. Bondarev

    2014-04-01

    Full Text Available Purpose. The purpose of work is scientifically grounded introduction of the acquired techniques into works for service life extension of the traction and motor rolling stock for industrial transport. Methodology. To achieve the purpose it was analyzed the acquired techniques for service life extension of the traction and motor rolling stock for mainline transport. The acquired techniques during solution of problems concerning the service life extension of rolling stock units were adapted to the locomotives TGM6A and traction aggregates OPE1. Findings. On the basis of experimental and theoretical complex of studies some results were obtained. They gave the ground to determine the possibility of acquired techniques use when solving the problems on service life extension of rolling stock units concerning locomotives TGM6A and traction aggregates OPE1. Originality. On the basis of conducted experimental and theoretical studies scientific maintenance of the works providing extension of service life of traction and motor units of industrial rolling stock was executed. Practical value. Technical solutions and measures, which have to be carried out during operation within the prolonged appointed service life of traction and motor units of industrial rolling stock enterprises using locomotives and traction aggregates to provide the basic technological cycles were developed.

  6. The influences of patient's satisfaction with medical service delivery, assessment of medical service, and trust in health delivery system on patient's life satisfaction in China.

    Science.gov (United States)

    Tang, Liyang

    2012-09-14

    Patient's satisfaction with medical service delivery/assessment of medical service/trust in health delivery system may have significant influence on patient's life satisfaction in China's health delivery system/in various kinds of hospitals.The aim of this study was to test whether and to what extent patient's satisfaction with medical service delivery/patient's assessments of various major aspects of medical service/various major aspects of patient's trust in health delivery system influenced patient's life satisfaction in China's health delivery system/in various kinds of hospitals. This study collaborated with National Bureau of Statistics of China to carry out a 2008 national urban resident household survey in 17 provinces, autonomous regions, and municipalities directly under the central government (N = 3,386), and specified ordered probit models were established to analyze dataset from this household survey. The key considerations in generating patient's life satisfaction involved patient's overall satisfaction with medical service delivery, assessment of doctor-patient communication, assessment of medical cost, assessment of medical treatment process, assessment of medical facility and hospital environment, assessment of waiting time for medical service, trust in prescription, trust in doctor, and trust in recommended medical examination. But the major considerations in generating patient's life satisfaction were different among low level public hospital, high level public hospital, and private hospital. The promotion of patient's overall satisfaction with medical service delivery, the improvement of doctor-patient communication, the reduction of medical cost, the improvement of medical treatment process, the promotion of medical facility and hospital environment, the reduction of waiting time for medical service, the promotion of patient's trust in prescription, the promotion of patient's trust in doctor, and the promotion of patient's trust in

  7. Quality of Life: Domains for Understanding Maths Anxiety in First Year Pre-Service Teachers through Identity Work

    Science.gov (United States)

    Wilson, Sue

    2016-01-01

    Mathematics anxiety in primary pre-service teachers' affects their future teaching of mathematics and achievement of students. Data collected via Critical Incident Technique were used to investigate this anxiety as perceived and identified by first year pre-service teachers. This paper proposes the application of the Quality of Life conceptual…

  8. The Effects of Different Aspects of Tourism Services on Travelers' Quality of Life: Model Validation, Refinement, and Extension

    OpenAIRE

    Neal, Janet Davis

    2000-01-01

    The Effects of Different Aspects of Tourism Services on Travelers' Quality of Life: Model Validation, Refinement, and Extension by Janet Davis Neal ABSTRACT Numerous satisfaction studies have been conducted in both tourism and marketing which have examined various aspects of travelers and/or consumers. Quality of life satisfaction studies look beyond the types of satisfaction experiences that endure for only a short time to those that "spill over" into individuals' life domains ...

  9. Leveraging Available Data to Support Extension of Transportation Packages Service Life

    International Nuclear Information System (INIS)

    Dunn, K.; Abramczyk, G.; Bellamy, S.; Daugherty, W.; Hackney, B.; Hoffman, E.; Skidmore, E.; Stefek, T.

    2012-01-01

    Data obtained from testing shipping package materials have been leveraged to support extending the service life of select shipping packages while in nuclear materials transportation. Increasingly, nuclear material inventories are being transferred to an interim storage location where they will reside for extended periods of time. Use of a shipping package to store nuclear materials in an interim storage location has become more attractive for a variety of reasons. Shipping packages are robust and have a qualified pedigree for their performance in normal operation and accident conditions within the approved shipment period and storing nuclear material within a shipping package results in reduced operations for the storage facility. However, the shipping package materials of construction must maintain a level of integrity as specified by the safety basis of the storage facility through the duration of the storage period, which is typically well beyond the one year transportation window. Test programs have been established to obtain aging data on materials of construction that are the most sensitive/susceptible to aging in certain shipping package designs. The collective data are being used to support extending the service life of shipping packages in both transportation and storage.

  10. Leveraging Available Data to Support Extension of Transportation Packages Service Life

    Energy Technology Data Exchange (ETDEWEB)

    Dunn, K.; Abramczyk, G.; Bellamy, S.; Daugherty, W.; Hackney, B.; Hoffman, E.; Skidmore, E.; Stefek, T.

    2012-06-12

    Data obtained from testing shipping package materials have been leveraged to support extending the service life of select shipping packages while in nuclear materials transportation. Increasingly, nuclear material inventories are being transferred to an interim storage location where they will reside for extended periods of time. Use of a shipping package to store nuclear materials in an interim storage location has become more attractive for a variety of reasons. Shipping packages are robust and have a qualified pedigree for their performance in normal operation and accident conditions within the approved shipment period and storing nuclear material within a shipping package results in reduced operations for the storage facility. However, the shipping package materials of construction must maintain a level of integrity as specified by the safety basis of the storage facility through the duration of the storage period, which is typically well beyond the one year transportation window. Test programs have been established to obtain aging data on materials of construction that are the most sensitive/susceptible to aging in certain shipping package designs. The collective data are being used to support extending the service life of shipping packages in both transportation and storage.

  11. Effects of Crack and Climate Change on Service Life of Concrete Subjected to Carbonation

    Directory of Open Access Journals (Sweden)

    Xiao-Yong Wang

    2018-04-01

    Full Text Available Carbonation is among the primary reasons for the initiation of the corrosion of steel rebar in reinforced concrete (RC structures. Due to structural loading effects and environmental actions, inevitable cracks have frequently occurred in concrete structures since the early ages. Additionally, climate change, which entails increases in CO2 concentration and environmental temperature, will also accelerate the carbonation of concrete. This article presents an analytical way of predicting the service life of cracked concrete structures considering influences of carbonation and climate change. First, using a hydration model, the quantity of carbonatable materials and concrete porosity were calculated. Carbonation depth was evaluated considering properties of concrete materials and environmental conditions. Second, the influence of cracks on CO2 diffusivity was examined. Carbonation depth for cracked concrete was evaluated using equivalent CO2 diffusivity. The effects of climate change, for example, growing CO2 concentration and environmental temperature, were considered using different schemes of carbonation models. Third, different climate change scenarios (such as Representative Concentration Pathways (RCP 2.6, RCP 4.5, RCP 8.5 and upper 90% confidence interval of RCP 8.5 and time slices (such as 2000 and 2050 were used for case studies. By utilizing the Monte Carlo method, the influences of various climate change scenarios on the service life loss of concrete structures were highlighted.

  12. Fee-for-service cancer rehabilitation programs improve health-related quality of life.

    Science.gov (United States)

    Kirkham, A A; Neil-Sztramko, S E; Morgan, J; Hodson, S; Weller, S; McRae, T; Campbell, K L

    2016-08-01

    Rigorously applied exercise interventions undertaken in a research setting result in improved health-related quality of life (hrqol) in cancer survivors, but research to demonstrate effective translation of that research to practice is needed. The objective of the present study was to determine the effect of fee-for-service cancer rehabilitation programs in the community on hrqol and on self-reported physical activity and its correlates. After enrolment and 17 ± 4 weeks later, new clients (n = 48) to two fee-for-service cancer rehabilitation programs completed the 36-Item Short Form Health Survey (rand-36: rand Corporation, Santa Monica, CA, U.S.A.), the Godin Leisure-Time Exercise Questionnaire, and questions about physical activity correlates. Normal fee-for-service operations were maintained, including a fitness assessment and individualized exercise programs supervised in a group or one-on-one setting, with no minimum attendance required. Fees were associated with the assessment and with each exercise session. Of the 48 participants, 36 (75%) completed both questionnaires. Improvements in the physical functioning, role physical, pain, and energy/fatigue scales on the rand-36 exceeded minimally important differences and were of a magnitude similar to improvements reported in structured, rigorously applied, and free research interventions. Self-reported levels of vigorous-intensity (p = 0.021), but not moderate-intensity (p = 0.831) physical activity increased. The number of perceived barriers to exercise (p = 0.035) and the prevalence of fatigue as a barrier (p = 0.003) decreased. Exercise self-efficacy improved only in participants who attended 11 or more sessions (p = 0.002). Exercise enjoyment did not change (p = 0.629). Enrolment in fee-for-service cancer rehabilitation programs results in meaningful improvements in hrqol comparable to those reported by research interventions, among other benefits. The fee-for-service model could be an effective model for

  13. Lesbian, Gay, Bisexual, and Transgender (LGBT) Service Members: Life After Don't Ask, Don't Tell.

    Science.gov (United States)

    Goldbach, Jeremy T; Castro, Carl Andrew

    2016-06-01

    Lesbian, gay, and bisexual service members can serve openly in the military with the repeal of the Don't Ask, Don't Tell policy. The fate of transgender service members remains uncertain as the policy preventing them from serving in the military remains under review. The health care needs of these populations remain for the most part unknown, with total acceptance and integration in the military yet to be achieved. In this paper, we review the literature on the health care needs of lesbian, gay, bisexual, and transgender (LGBT) service members, relying heavily on what is known about LGBT civilian and veteran populations. Significant research gaps about the health care needs of LGBT service members are identified, along with recommendations for closing those gaps. In addition, recommendations for improving LGBT acceptance and integration within the military are provided.

  14. Acceptance towards Goods and Services Tax (GST and Quality of Life: Antecedent and outcome using partial least square method

    Directory of Open Access Journals (Sweden)

    Arlinah Abd Rashid

    2016-06-01

    Full Text Available The good and service tax (GST in Malaysia was implemented in 2015 as a tax reform program to generate a stable source of revenue. This study explores the respondents’ behaviour towards GST, a week post-implementation. The partial least square (PLS modelling was used to establish the relationship between acceptance, knowledge and feelings towards GST as well as the household quality of life. There is a positive relationship between the antecedents and the quality of life. Acceptance of GST exerts a significant relationship towards feelings and quality of life. The study concludes that Malaysians, in general, accept GST that ensures a better quality of life in the future.

  15. Life cycle assessment needs predictive spatial modelling for biodiversity and ecosystem services.

    Science.gov (United States)

    Chaplin-Kramer, Rebecca; Sim, Sarah; Hamel, Perrine; Bryant, Benjamin; Noe, Ryan; Mueller, Carina; Rigarlsford, Giles; Kulak, Michal; Kowal, Virginia; Sharp, Richard; Clavreul, Julie; Price, Edward; Polasky, Stephen; Ruckelshaus, Mary; Daily, Gretchen

    2017-04-21

    International corporations in an increasingly globalized economy exert a major influence on the planet's land use and resources through their product design and material sourcing decisions. Many companies use life cycle assessment (LCA) to evaluate their sustainability, yet commonly-used LCA methodologies lack the spatial resolution and predictive ecological information to reveal key impacts on climate, water and biodiversity. We present advances for LCA that integrate spatially explicit modelling of land change and ecosystem services in a Land-Use Change Improved (LUCI)-LCA. Comparing increased demand for bioplastics derived from two alternative feedstock-location scenarios for maize and sugarcane, we find that the LUCI-LCA approach yields results opposite to those of standard LCA for greenhouse gas emissions and water consumption, and of different magnitudes for soil erosion and biodiversity. This approach highlights the importance of including information about where and how land-use change and related impacts will occur in supply chain and innovation decisions.

  16. Life cycle assessment needs predictive spatial modelling for biodiversity and ecosystem services

    Science.gov (United States)

    Chaplin-Kramer, Rebecca; Sim, Sarah; Hamel, Perrine; Bryant, Benjamin; Noe, Ryan; Mueller, Carina; Rigarlsford, Giles; Kulak, Michal; Kowal, Virginia; Sharp, Richard; Clavreul, Julie; Price, Edward; Polasky, Stephen; Ruckelshaus, Mary; Daily, Gretchen

    2017-04-01

    International corporations in an increasingly globalized economy exert a major influence on the planet's land use and resources through their product design and material sourcing decisions. Many companies use life cycle assessment (LCA) to evaluate their sustainability, yet commonly-used LCA methodologies lack the spatial resolution and predictive ecological information to reveal key impacts on climate, water and biodiversity. We present advances for LCA that integrate spatially explicit modelling of land change and ecosystem services in a Land-Use Change Improved (LUCI)-LCA. Comparing increased demand for bioplastics derived from two alternative feedstock-location scenarios for maize and sugarcane, we find that the LUCI-LCA approach yields results opposite to those of standard LCA for greenhouse gas emissions and water consumption, and of different magnitudes for soil erosion and biodiversity. This approach highlights the importance of including information about where and how land-use change and related impacts will occur in supply chain and innovation decisions.

  17. Germany: the government has approved of the extension of the service life of nuclear reactors

    International Nuclear Information System (INIS)

    Anon.

    2010-01-01

    The German coalition government has decided on 28 september 2009 to expend the service life of the 17 operating nuclear reactors through the approval of the plan 'Energy 2050'. The average extension will be of 12 years. This decision will postpone the shutdown of the last reactor till 2040. The reciprocal arrangement implies that the nuclear plant operators (EON, RWE, Wattenfall and EnBW) will have to pay an annual tax of 2.3*10 9 euros till 2016. The operators will also have to finance a capital for the development of renewable energies: 200*10 6 euros in 2011 and in 2012 then 300*10 6 euros per year between 2013 and 2016 and eventually to pay a tax of 9 euros per MW of nuclear power produced. (A.C.)

  18. On the value of SHM in the context of service life integrity management

    DEFF Research Database (Denmark)

    Qin, Jianjun; Thöns, Sebastian; Faber, Michael Havbro

    2015-01-01

    This paper addresses the optimization of structural health monitoring(SHM) before its implementation on the basis of its Value of Information (VoI). The approach for the quantification of the value of SHM builds upon a service life cost assessment and generic structural performance model...... in conjunction with the observation, i.e. monitoring, of deterioration increments. The structural performance is described with a generic deterioration model to be calibrated to the relevant structural deterioration mechanism, such as e.g. fatigue and corrosion. The generic deterioration model allows...... for the incorporation of monitored damage increments and accounts for the precision of the data by considering the statistical uncertainties, i.e. the amount of monitoring data due to the monitoring period, and by considering the measurement uncertainty. The value of structural health monitoring is then quantified...

  19. LEVERAGING AGING MATERIALS DATA TO SUPPORT EXTENSION OF TRANSPORTATION SHIPPING PACKAGES SERVICE LIFE

    Energy Technology Data Exchange (ETDEWEB)

    Dunn, K. [Savannah River National Laboratory; Bellamy, S. [Savannah River National Laboratory; Daugherty, W. [Savannah River National Laboratory; Sindelar, R. [Savannah River National Laboratory; Skidmore, E. [Savannah River National Laboratory

    2013-08-18

    Nuclear material inventories are increasingly being transferred to interim storage locations where they may reside for extended periods of time. Use of a shipping package to store nuclear materials after the transfer has become more common for a variety of reasons. Shipping packages are robust and have a qualified pedigree for performance in normal operation and accident conditions but are only certified over an approved transportation window. The continued use of shipping packages to contain nuclear material during interim storage will result in reduced overall costs and reduced exposure to workers. However, the shipping package materials of construction must maintain integrity as specified by the safety basis of the storage facility throughout the storage period, which is typically well beyond the certified transportation window. In many ways, the certification processes required for interim storage of nuclear materials in shipping packages is similar to life extension programs required for dry cask storage systems for commercial nuclear fuels. The storage of spent nuclear fuel in dry cask storage systems is federally-regulated, and over 1500 individual dry casks have been in successful service up to 20 years in the US. The uncertainty in final disposition will likely require extended storage of this fuel well beyond initial license periods and perhaps multiple re-licenses may be needed. Thus, both the shipping packages and the dry cask storage systems require materials integrity assessments and assurance of continued satisfactory materials performance over times not considered in the original evaluation processes. Test programs for the shipping packages have been established to obtain aging data on materials of construction to demonstrate continued system integrity. The collective data may be coupled with similar data for the dry cask storage systems and used to support extending the service life of shipping packages in both transportation and storage.

  20. Replacement of major nuclear power plant components for service life extension

    International Nuclear Information System (INIS)

    Novak, S.

    1987-01-01

    Problems are discussed associated with replacement of nuclear power plant components with the aim to extend their original scheduled life. The existing foreign experience shows that it is technically feasible to replace practically all basic components for which the necessity of replacement is established. Data is summed up on the replacement of steam generators in US and West German nuclear power plants showing the duration of the job, the total consumption of manhours, the collective dose equivalent and the cost. Attention is also focused on implemented and projected replacements of circulation pipes in nuclear power plants abroad. Based on these figures, the cost is estimated of the replacement of the reactor vessel and the steam generators for WWER-440 nuclear power plants. The conclusion is arrived at that even based on a conservative estimate, the extension by 20 years of the service life of a nuclear power plant is economically more effective than the construction of a new plant. (Z.M.) 2 tabs., 15 refs., 3 figs

  1. An End of Service Life Assessment of PMMA Lenses from Veteran Concentrator Photovoltaic Systems

    Energy Technology Data Exchange (ETDEWEB)

    Miller, David C.; Khonkar, Hussameldin I.; Herrero, Rebecca; Anton, Ignacio; Johnson, David K.; Vinzant, Todd B.; Deutch, Steve; To, Bobby; Sala, Gabriel; Kurtz, Sarah R.

    2017-03-21

    The optical performance of poly(methyl methacrylate) lenses from veteran concentrator photovoltaic modules was examined after the end of their service life. Lenses from the Martin-Marietta and Intersol module designs were examined from the 'Solar Village' site near Riyadh, Saudi Arabia, as well as the Phoenix Sky Harbor airport, followed by the Arizona Public Service Solar Test and Research (APS-STaR) center in Tempe, Arizona. The various lens specimens were deployed for 20, 27, and 22 years, respectively. Optical characterizations included lens efficiency (Solar Simulator instrument), material transmittance and haze (of coupons cut from veteran lenses, then measured again after their faceted back surface was polished, and then measured again after the incident front surface was polished), and direct transmittance (as a function of detector's acceptance angle, using the Very Low Angular Beam Spread ('VLABS') instrument). Lens efficiency measurements compared the central region to the entire lens, also using hot and cold mirror measurements to diagnose differences in performance. A series of subsequent characterizations was performed because a decrease in performance of greater than 10% was observed for some of the veteran lenses. Surface roughness was examined using atomic force microscopy and scanning electron microscopy. Facet geometry (tip and valley radius) was quantified on cross-sectioned specimens. Molecular weight was compared between the incident and faceted surfaces of the lenses.

  2. Notch fatigue crack propagation - A consistent concept for calculating flawed service life

    International Nuclear Information System (INIS)

    Dankert, M.

    1999-01-01

    The research report presents a consistent concept of elastic-plastic fatigue fracture mechanics, to be used for numerical description of crack initiation and propagation behaviour within and out of notched areas of circular notched specimens for Woehler tests, two-phase fatigue tests and tests under service conditions. It is shown that a fracture-mechanics approach yields results capable of describing the load history over the whole service life of a structural member. A J-integral-related crack propagation model is derived that takes into account the crack opening and closure behaviour. The model is based on specially developed formulas, algorithms and approximation formulas required for description of crack opening and closure behaviour as well as calculation of the stress intensity factor K and the J-integral of cracks at notches. The values relating to crack opening were compared with experimental data, and those describing the stress intensity factor K and the J-integrals with 2D and 3D elastic-plastic FE calculations. Good and very good agreement of results was achieved. (orig./CB) [de

  3. A service life extension (SLEP) approach to operating aging aircraft beyond their original design lives

    Science.gov (United States)

    Pentz, Alan Carter

    With today's uncertain funding climate (including sequestration and continuing budget resolutions), decision makers face severe budgetary challenges to maintain dominance through all aspects of the Department of Defense (DoD). To meet war-fighting capabilities, the DoD continues to extend aircraft programs beyond their design service lives by up to ten years, and occasionally much more. The budget requires a new approach to traditional extension strategies (i.e., reuse, reset, and reclamation) for structural hardware. While extending service life without careful controls can present a safety concern, future operations planning does not consider how much risk is present when operating within sound structural principles. Traditional structural hardware extension methods drive increased costs. Decision makers often overlook the inherent damage tolerance and fatigue capability of structural components and rely on simple time- and flight-based cycle accumulation when determining aircraft retirement lives. This study demonstrates that decision makers should consider risk in addition to the current extension strategies. Through an evaluation of eight military aircraft programs and the application and simulation of F-18 turbine engine usage data, this dissertation shows that insight into actual aircraft mission data, consideration of fatigue capability, and service extension length are key factors to consider. Aircraft structural components, as well as many critical safety components and system designs, have a predefined level of conservatism and inherent damage tolerance. The methods applied in this study would apply to extensions of other critical structures such as bridges. Understanding how much damage tolerance is built into the design compared to the original design usage requirements presents the opportunity to manage systems based on risk. The study presents the sensitivity of these factors and recommends avenues for further research.

  4. Energy saving potential of energy services - experimentation on the life cycle of energy conversion equipment

    International Nuclear Information System (INIS)

    Dupont, M.

    2006-12-01

    Energy efficiency services are growing in Europe but their role is still limited. In order to evaluate the potential, we focused first of all on policy, economical and environmental mechanisms that support their development. European natural gas and electricity markets, that are now almost wholly de-regulated, are analysed and compared to their historical structure. By introducing uncertainty on energy prices, this new deal translates better the real energy costs. Energy performance contracts (EPC) limit the impact of these uncertainties on the customer energy bills by guaranteeing a financial result. As a result of the modelling of these contracts, namely operation and maintenance ones, we prove that they transfer technical and financial risks from building owners to energy service companies (ESCO) making energy saving measures easier and less expensive at the same time. These contracts are relatively widespread for heating or compressed-air processes but remain marginal for air-conditioning systems. So new methods were needed to guarantee on the long terms the efficiency of air-conditioning systems demand (1) to master the process and its performances and (2) to be able to determine precisely the energy saving potential and its realisation costs. A detailed energy audit is thus necessary for which we propose a guidance. Conclusions of audits carried out prove that energy saving potential is mainly located in equipment management and control. These optimizations are not always carried out because of a lack of contractual incentive and due to the weaknesses of audit methods. Through the involvement of an independent expert, the mandatory and regular inspection of air-conditioning systems may allow to verify and guide such practices. A three-step analysis procedure has been developed in order to maximize the inspection potential and to get higher benefits from service contracts. (author)

  5. Life extension, power upgrade, and return to service work for Pickering NGS and other PWR and CANDU plants

    International Nuclear Information System (INIS)

    Millman, J.; Idvorian, N.; Schneider, W.

    2002-01-01

    Work on life extension, power upgrade and return to service has been performed and is in progress for a number of PWR and CANDU plants. For PWR plants, power upgrade work has been done for the new replacement steam generators in several cases. This work consists of redoing the formal equipment qualification analysis and reports for the uprated operating conditions to support the application for license adjustment. Life extension assessments have been performed for several CANDU plants. These are highly detailed assessments in which the particular steam generator is reassessed part by part as to the ability of each to sustain full life operation and also extended life operation. Return to service work for Pickering NGSA specifically has included this type of assessment and also specific repair, cleaning and retrofit activities including secondary side inspection, waterlancing, divider plate repair, eddy current inspection, etc. Steam generator modifications and retrofit work have been performed in a number of cases. The paper discusses various life extension, power upgrade, equipment modification and return to service activities all of which are part of the renewed drive in the industry to realise the full potential of nuclear plants by getting more and better performance from the extended service of existing plants. (author)

  6. The Association Between Home Palliative Care Services and Quality of End-of-Life Care Indicators in the Province of Québec.

    Science.gov (United States)

    Gagnon, Bruno; Nadeau, Lyne; Scott, Susan; Dumont, Serge; MacDonald, Neil; Aubin, Michèle; Mayo, Nancy

    2015-07-01

    In Canada, governments have increased spending on home care to promote better end-of-life care. In the province of Québec, Canada, home palliative care (PC) services (HPCS) are provided by Public Local Community-Based Health Care Service providers (Centres Locaux de Services Communautaires [CLSC]) with universal coverage. Accordingly, there should be no regional variations of these services and their effect on quality of end-of-life PC (QEoLPC) indicators. To test if all the CLSCs provided the same level of HPCS to cancer patients in the province of Québec, Canada, and the association between level of HPCS and QEoLPC indicators. Characteristics of 52,316 decedents with cancer were extracted from administrative databases between 2003 and 2006. Two gender-specific "adjusted performance of CLSCs in delivering HPCS" models were created using gender-specific hierarchical regression adjusted for patient and CLSC neighborhood characteristics. Using the same approach, the strength of the association between the adjusted performance of CLSCs in delivering HPCS and the QEoLPC indicators was estimated. Overall, 27,255 (52.1%) decedents had at least one HPCS. Significant variations in the adjusted performance of CLSC in delivering HPCS were found. Higher performance led to a lower proportion of men having more than one emergency room visit during the last month of life (risk ratio [RR] 0.924; 95% CI 0.867-0.985), and for women, a higher proportion dying at home (RR 2.255; 95% CI 1.703-2.984) and spending less time in hospital (RR 0.765; 95% CI 0.692-0.845). Provision of HPCS remained limited in Québec, but when present, they were associated with improved QEoLPC indicators. Copyright © 2015 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.

  7. Internet Service Cognition and Use, and Their Promotion of Quality of Life in Taiwan

    Science.gov (United States)

    Liang, Te-Hsin

    2011-01-01

    The "e-Taiwan Program" implemented by Taiwan government is aimed at showing the e-advantage in people's life and bring about essential benefits. This research follows the e-Life indicators of the Quality of Life measurement system developed by "e-Taiwan Program", which including four major dimensions of e-Daily Life,…

  8. And the Dead Remain Behind

    Directory of Open Access Journals (Sweden)

    Peter Read

    2013-08-01

    Full Text Available In most cultures the dead and their living relatives are held in a dialogic relationship. The dead have made it clear, while living, what they expect from their descendants. The living, for their part, wish to honour the tombs of their ancestors; at the least, to keep the graves of the recent dead from disrepair. Despite the strictures, the living can fail their responsibilities, for example, by migration to foreign countries. The peripatetic Chinese are one of the few cultures able to overcome the dilemma of the wanderer or the exile. With the help of a priest, an Australian Chinese migrant may summon the soul of an ancestor from an Asian grave to a Melbourne temple, where the spirit, though removed from its earthly vessel, will rest and remain at peace. Amongst cultures in which such practices are not culturally appropriate, to fail to honour the family dead can be exquisitely painful. Violence is the cause of most failure.

  9. Mathematical modeling of the heat transfer for determining the depth of thawing basin buildings with long service life

    Science.gov (United States)

    Sirditov, Ivan; Stepanov, Sergei

    2017-11-01

    In this paper, a numerical study of the problem of determining a thawing basin in the permafrost soil for buildings with a long service life is carried out using two methods, with the formulas of set of rules 25.13330.2012 "Soil bases and foundations on permafrost soils" and using a mathematical model.

  10. Health Care Service Needs and Correlates of Quality of Life: A Case Study of Elderly Chinese Immigrants in Canada

    Science.gov (United States)

    Chow, Henry P. H.

    2012-01-01

    This study explored the health care service needs and the major correlates of quality of life among 127 community-dwelling elderly Chinese immigrants in a western Canadian city. Participants were interviewed in their homes by trained, bilingual interviewers employing a structured questionnaire that covered a wide range of topics including health…

  11. Comparing the Life Cycle Energy Consumption, Global Warming and Eutrophication Potentials of Several Water and Waste Service Options

    Science.gov (United States)

    Managing the water-energy-nutrient nexus for the built environment requires, in part, a full system analysis of energy consumption, global warming and eutrophication potentials of municipal water services. As an example, we evaluated the life cycle energy use, greenhouse gas (GHG...

  12. Evaluating weather factors and material response during outdoor exposure to determine accelerated test protocols for predicting service life

    Science.gov (United States)

    R. Sam Williams; Steven Lacher; Corey Halpin; Christopher White

    2005-01-01

    To develop service life prediction methods for the study of sealants, a fully instrumented weather station was installed at an outdoor test site near Madison, WI. Temperature, relative humidiy, rainfall, ultraviolet (UV) radiation at 18 wavelengths, and wind speed and direction are being continuously measured and stored. The weather data can be integrated over time to...

  13. Association between obesity, quality of life, physical activity and health service utilization in primary care patients with osteoarthritis.

    NARCIS (Netherlands)

    Rosemann, T.J.; Grol, R.P.T.M.; Herman, K.; Wensing, M.J.P.; Szecsenyi, J.

    2008-01-01

    ABSTRACT: OBJECTIVE: To assess the association of obesity with quality of life, health service utilization and physical activity in a large sample of primary care patients with osteoarthritis (OA). METHODS: Data were retrieved from the PraxArt project, representing a cohort of 1021 primary care

  14. Athletes Off the Field: A Model for Team Building and Leadership Development through Service Learning. Linking Learning with Life.

    Science.gov (United States)

    Haughey, Laurie

    This booklet provides step-by-step guidelines for developing a leadership-through-service-learning component for a school athletic team. It is based on a program called LIFE LINE (Leaders in Football and Education) founded in 1996 as a peer leadership group that would increase team unity and success both on and off the field. The guide summarizes…

  15. The Relationship of Perceptions of Service and Support Adequacy to Family Quality of Life for Families of Children with Deafblindness

    Science.gov (United States)

    Kyzar, Kathleen

    2010-01-01

    This study investigated the relationship between families' perceptions of supports and services and family quality of life (FQOL) for families of children with deafblindness, and the potential of satisfaction with family-professional partnerships and child age as moderators of this relationship. The study was guided by the Unified Theory of Family…

  16. Model for Predicting Traffic Signs Functional Service Life – The Republic of Croatia Case Study

    Directory of Open Access Journals (Sweden)

    Dario Babić

    2017-06-01

    Full Text Available Traffic signs are the basic elements of communication between the relevant road authorities and road users. They manage, regulate, inform and warn road users to ensure their safe movement throughout transport networks. Traffic signs must be timely visible to all traffic participants in all weather and traffic conditions in order to fulfil their function, which means they must have satisfactory retroreflection properties. This paper presents a research of the deterioration of traffic signs retroreflection. The aim of this article is to develop models that will effectively enable predicting the retroreflection of traffic signs and thus optimize the maintenance activities and replacement of road signs to increase road safety. The research included measurements of retroreflection of retroreflective material Classes I and II (white, red and blue colour and Class III (red and yellow colour. Based on the collected data from the City of Zagreb (Republic of Croatia, the authors developed the models to estimate the functional service life of certain colours and materials used to make traffic signs. Considering that the average coefficient of determination for all the models is between 0.55-0.60, they present an effective tool in the traffic sign maintenance system.

  17. Coupling between cracking and permeability, a model for structure service life prediction

    International Nuclear Information System (INIS)

    Lasne, M.; Gerard, B.; Breysse, D.

    1993-01-01

    Many authors have chosen permeability coefficients (permeation, diffusion) as a reference for material durability and for structure service life prediction. When we look for designing engineered barriers for radioactive waste storage we find these macroscopic parameters very essential. In order to work with a predictive model of transfer properties evolution in a porous media (concrete, mortar, rock) we introduce a 'micro-macro' hierarchical model of permeability whose data are the total porosity and the pore size distribution. In spite of the simplicity of the model (very small CPU time consuming) comparative studies show predictive results for sound cement pastes, mortars and concretes. Associated to these works we apply a model of damage due to hydration processes at early ages to a container as a preliminary underproject for the definitive storage of Low Level radioactive Waste (LLW). Data are geometry, cement properties and damage measurement of concrete. This model takes into account the mechanical property of the concrete maturation (volumic variations during cement hydration can damage the structures). Some local microcracking can appear and affect the long term durability. Following these works we introduce our research program for the concrete cracking analysis. An experimental campaign is designed in order to determine damage-cracking-porosity-permeability coupling. (authors). 12 figs., 16 refs

  18. Service-life prediction of reinforced concrete structures in subsurface environment

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Ki Jung; Jung, Hae Ryong; Park, Joo Wan [Korea Radioactive Waste Agency, Daejeon (Korea, Republic of)

    2016-03-15

    This paper focuses on the estimation of durability and service-life of reinforced concrete structures in Wolsong Low- and intermediate-level wastes Disposal Center (WLDC) in Korea. There are six disposal silos located in the saturated environment. The silo concrete is degraded due to reactions with groundwater and chemical attacks, and finally it will lose its properties as a transport barrier. The infiltration of sulfate and magnesium, leaching of potassium hydroxide, and chlorine induced corrosion are the most significant factors for degradation of reinforced concrete structure in underground environment. From the result of evaluation of the degradation time for each factor, the degradation rate of the reinforced concrete due to sulfate and magnesium is 1.308×10{sup -3} cm/yr, and it is estimated to take 48,000 years for full degradation while potassium hydroxide is leached in depth of less than 1.5 cm at 1,000 years after the initiation of degradation. In case of chlorine induced corrosion, it takes 1,648 years to initiate corrosion in the main reinforced bar and 2,288 years to reach the lifetime limit of the structural integrity, and thus it is evaluated as the most significant factor.

  19. How does substrate roughness affect the service life of a superhydrophobic coating?

    Science.gov (United States)

    Zhang, Xin; Mo, Jiliang; Si, Yifan; Guo, Zhiguang

    2018-05-01

    Although the development of superhydrophobic coatings is rapidly maturing, issues related to their low mechanical durability persist. In this context, the effect of substrate roughness on the service life of superhydrophobic coatings was studied. In this study, superhydrophobic coatings were fabricated on sandpapers of different roughness and reciprocating wear tests were conducted. The wear-resistance number of the superhydrophobic coating, defined as the maximum number of friction cycles after which the superhydrophobic surface started to lose its superhydrophobicity, increased from 50 to 24,000 with an increase in the substrate roughness from 2000 CW to 240 CW (CW is defined as the number of particles arranged in an inch), while it decreased from 24,000 to 17,000 with a further increase in the substrate roughness from 240 CW to 60 CW. Observations of the surface structure and wear analyses indicated that the superhydrophobic material infiltrated the spaces between the sand grains, and the rough peaks could consequently protect the superhydrophobic material during the wear tests. However, this protection weakens when the substrate roughness increases or decreases beyond certain values. Furthermore, these phenomena and results were also verified by applying the superhydrophobic coatings to different types of common substrates.

  20. Analysis on regulation strategies for extending service life of hydropower turbines

    Science.gov (United States)

    Yang, W.; Norrlund, P.; Yang, J.

    2016-11-01

    Since a few years, there has been a tendency that hydropower turbines experience fatigue to a greater extent, due to increasingly more regulation movements of governor actuators. The aim of this paper is to extend the service life of hydropower turbines, by reasonably decreasing the guide vane (GV) movements with appropriate regulation strategies, e.g. settings of PI (proportional-integral) governor parameters and controller filters. The accumulated distance and number of GV movements are the two main indicators of this study. The core method is to simulate the long-term GV opening of Francis turbines with MATLAB/Simulink, based on a sequence of one-month measurements of the Nordic grid frequency. Basic theoretical formulas are also discussed and compared to the simulation results, showing reasonable correspondence. Firstly, a model of a turbine governor is discussed and verified, based on on-site measurements of a Swedish hydropower plant. Then, the influence of governor parameters is discussed. Effects of different settings of controller filters (e.g. dead zone, floating dead zone and linear filter) are also examined. Moreover, a change in GV movement might affect the quality of the frequency control. This is also monitored via frequency deviation characteristics, determined by elementary simulations of the Nordic power system. The results show how the regulation settings affect the GV movements and frequency quality, supplying suggestions for optimizing the hydropower turbine operation for decreasing the wear and tear.

  1. Life cycle assessment needs predictive spatial modelling for biodiversity and ecosystem services

    Science.gov (United States)

    Chaplin-Kramer, Rebecca; Sim, Sarah; Hamel, Perrine; Bryant, Benjamin; Noe, Ryan; Mueller, Carina; Rigarlsford, Giles; Kulak, Michal; Kowal, Virginia; Sharp, Richard; Clavreul, Julie; Price, Edward; Polasky, Stephen; Ruckelshaus, Mary; Daily, Gretchen

    2017-01-01

    International corporations in an increasingly globalized economy exert a major influence on the planet's land use and resources through their product design and material sourcing decisions. Many companies use life cycle assessment (LCA) to evaluate their sustainability, yet commonly-used LCA methodologies lack the spatial resolution and predictive ecological information to reveal key impacts on climate, water and biodiversity. We present advances for LCA that integrate spatially explicit modelling of land change and ecosystem services in a Land-Use Change Improved (LUCI)-LCA. Comparing increased demand for bioplastics derived from two alternative feedstock-location scenarios for maize and sugarcane, we find that the LUCI-LCA approach yields results opposite to those of standard LCA for greenhouse gas emissions and water consumption, and of different magnitudes for soil erosion and biodiversity. This approach highlights the importance of including information about where and how land-use change and related impacts will occur in supply chain and innovation decisions. PMID:28429710

  2. Integrated earth system dynamic modeling for life cycle impact assessment of ecosystem services.

    Science.gov (United States)

    Arbault, Damien; Rivière, Mylène; Rugani, Benedetto; Benetto, Enrico; Tiruta-Barna, Ligia

    2014-02-15

    Despite the increasing awareness of our dependence on Ecosystem Services (ES), Life Cycle Impact Assessment (LCIA) does not explicitly and fully assess the damages caused by human activities on ES generation. Recent improvements in LCIA focus on specific cause-effect chains, mainly related to land use changes, leading to Characterization Factors (CFs) at the midpoint assessment level. However, despite the complexity and temporal dynamics of ES, current LCIA approaches consider the environmental mechanisms underneath ES to be independent from each other and devoid of dynamic character, leading to constant CFs whose representativeness is debatable. This paper takes a step forward and is aimed at demonstrating the feasibility of using an integrated earth system dynamic modeling perspective to retrieve time- and scenario-dependent CFs that consider the complex interlinkages between natural processes delivering ES. The GUMBO (Global Unified Metamodel of the Biosphere) model is used to quantify changes in ES production in physical terms - leading to midpoint CFs - and changes in human welfare indicators, which are considered here as endpoint CFs. The interpretation of the obtained results highlights the key methodological challenges to be solved to consider this approach as a robust alternative to the mainstream rationale currently adopted in LCIA. Further research should focus on increasing the granularity of environmental interventions in the modeling tools to match current standards in LCA and on adapting the conceptual approach to a spatially-explicit integrated model. Copyright © 2013 Elsevier B.V. All rights reserved.

  3. The relationship between childhood poverty, military service, and later life depression among men: Evidence from the Health and Retirement Study.

    Science.gov (United States)

    Bareis, Natalie; Mezuk, Briana

    2016-12-01

    Childhood poverty has been associated with depression in adulthood, but whether this relationship extends to later life major depression (MD) or is modified by military service is unclear. Data come from the Health and Retirement Study (HRS) 2010 wave, a longitudinal, nationally representative study of older adults. Men with data on military service and childhood poverty were included (N=6330). Childhood poverty was assessed by four indicators (i.e., parental unemployment, residential instability) experienced before age 16. Military service was categorized as veteran versus civilian, and during draft versus all-volunteer (after 1973) eras. Past year MD was defined by the Composite International Diagnostic Inventory. Four in ten men ever served, with 13.7% in the all-volunteer military. Approximately 12% of civilians, 8% draft era and 24% all-volunteer era veterans had MD. Childhood poverty was associated with higher odds of MD (Odds Ratio (OR): 2.38, 95% Confidence Interval (CI): 1.32-4.32) and higher odds of military service (OR: 2.58, 95% CI: 1.58-4.21). Military service was marginally associated with MD (OR: 1.28, 95% CI: 0.98-1.68) and did not moderate the association between childhood poverty and MD. Self-report data is subject to recall bias. The HRS did not assess childhood physical and emotional abuse, or military combat exposure. Men raised in poverty had greater odds of draft and all-volunteer military service. Early-life experiences, independent of military service, appear associated with greater odds of MD. Assessing childhood poverty in service members may identify risk for depression in later life. Copyright © 2016 Elsevier B.V. All rights reserved.

  4. A future for nuclear sites beyond their service life. Nuclear site value development

    International Nuclear Information System (INIS)

    2008-01-01

    As the nuclear industry moves into a new development phase, many facilities built in the fifties and sixties are reaching the end of their service life. Dismantling them and rehabilitating the sites on which they stand is a major industrial challenge which will give rise to a number of new projects. AREVA has more than 20 years' experience in these highly technical fields. As more and more sites reach the end of their service life, AREVA considers nuclear site value development as a fully-fledged industrial activity. The group's competencies in this field have been grouped together to form a dedicated entity: the Nuclear Site Value Development Business Unit, created in 2008. Several billion euros are invested in site value development projects which are far-reaching and complex, and often last for several decades. Long before work actually begins, lengthy studies and preparations are required to schedule operations, select the techniques to be used and optimize costs and deadlines. The Nuclear Site Value Development BU is currently working on four major projects involving its own facilities and those of the CEA: - La Hague: dismantling of the first generation of used fuel recycling facilities. Between 1966 and 1998, almost 5,000 tons of used fuel from graphite-moderated gas-cooled reactors, 4,500 tons of light water reactor fuel, as well as fuel from fast reactors and research reactors, were treated at UP2 400, the very first industrial recycling plant on the La Hague site. - Marcoule: first-time dismantling of a recycling plant. 1,000 rooms to be cleaned up, 30,000 tons of waste to be treated, 30 years of work. - Cadarache: first-time dismantling of a Mox fuel fabrication plant. The Cadarache plant was commissioned in 1962 to fabricate fuel for fast reactors; this was followed by MOX fuel for light water reactors, an activity which continued until the plant was shut down in 2003. - Annecy and Veurey: giving a new lease of life to former industrial sites in built

  5. Geriatric infrastructure, BRAC, and ecosystem service markets? End-of-life decisions for dams, roads, and offshore platforms (Invited)

    Science.gov (United States)

    Doyle, M. W.

    2010-12-01

    US infrastructure expanded dramatically in the mid-20th century, and now includes more than 79,000 dams, 15,000 miles of levees, 3.7 million miles of roads, 600,000 miles of sewer pipe, 500,000 onshore oil wells, and over 4,000 offshore oil platforms. Many structures have been in place for 50 years or more, and an increasing portion of national infrastructure is approaching or exceeding its originally intended design life. Bringing national infrastructure to acceptable levels would cost nearly 10% of the US annual GDP. Decommissioning infrastructure can decrease public spending and increase public safety while facilitating economic expansion and ecological restoration. While most infrastructure remains critical to the national economy, a substantial amount is obsolete or declining in importance. Over 11,000 dams are abandoned, and of nearly 400,000 miles of road on its lands, the U.S. Forest Service considers one-fourth non-essential and often non-functional. Removing obsolete infrastructure allows greater focus and funding on maintaining or improving infrastructure most critical to society. Moreover, a concerted program of infrastructure decommissioning promises significant long-term cost savings, and is a necessary step before more substantial, systematic changes are possible, like those needed to address the new energy sources and shifting climate. One key challenge for infrastructure reform is how to prioritize and implement such a widespread and politically-charged series of decisions. Two approaches are proposed for different scales. For small, private infrastructure, emerging state and federal ecosystem service markets can provide an economic impetus to push infrastructure removal. Ecosystem market mechanisms may also be most effective at identifying those projects with the greatest ecological bang for the buck. Examples where this approach has proved successful include dam removal for stream mitigation under the Clean Water Act, and levee decommissioning on

  6. Red Assembly: the work remains

    Directory of Open Access Journals (Sweden)

    Leslie Witz

    installed. What to do at this limit, at the transgressive encounter between saying yes and no to history, remains the challenge. It is the very challenge of what insistently remains.

  7. Evaluation of Hose in Hose Transfer Line Service Life for Hanford's Interim Stabilization Program

    Energy Technology Data Exchange (ETDEWEB)

    TORRES, T.D.

    2000-08-24

    RPP-6153, Engineering Task Plan for Hose-in-Hose Transfer System for the Interim Stabilization Program, defines the programmatic goals, functional requirements, and technical criteria for the development and subsequent installation of transfer line equipment to support Hanford's Interim Stabilization Program. RPP-6028, Specification for Hose in Hose Transfer Lines for Hanford's Interim Stabilization Program, has been issued to define the specific requirements for the design, manufacture, and verification of transfer line assemblies for specific waste transfer applications. Included in RPP-6028 are tables defining the chemical constituents of concern to which transfer lines will be exposed. Current Interim Stabilization Program planning forecasts that the at-grade transfer lines will be required to convey pumpable waste for as much as three years after commissioning. Prudent engineering dictates that the equipment placed in service have a working life in excess of this forecasted time period, with some margin to allow for future adjustments to the planned schedule. This document evaluates the effective service life of the Hose-in-Hose Transfer Lines, based on information submitted by the manufacturer and published literature. The effective service life of transfer line assemblies is a function of several factors. Foremost among these are process fluid characteristics, ambient environmental conditions, and the manufacturer's stated shelf life. This evaluation examines the manufacturer's certification of shelf life, the manufacturer's certifications of chemical compatibility with waste, and published literature on the effects of exposure to ionizing radiation on the mechanical properties of elastomeric materials to evaluate transfer line service life.

  8. Green business will remain green

    International Nuclear Information System (INIS)

    Marcan, P.

    2008-01-01

    It all started with two words. Climate change. The carbon dioxide trading scheme, which was the politicians' idea on solving the number one global problem, followed. Four years ago, when the project was begun, there was no data for project initiation. Quotas for polluters mainly from energy production and other energy demanding industries were distributed based on spreadsheets, maximum output and expected future development of economies. Slovak companies have had a chance to profit from these arrangements since 2005. Many of them took advantage of the situation and turned the excessive quotas into an extraordinary profit which often reached hundreds of million Sk. The fact that the price of free quotas offered for sale dropped basically to 0 in 2006 only proved that the initial distribution was too generous. And the market reacted to the first official measurements of emissions. Slovak companies also contributed to this development. However, when planning the maximum emission volumes for 2008-2012 period, in spite of the fact that actual data were available, their expectations were not realistic. A glance at the figures in the proposal of the Ministry of Environment is sufficient to realize that there will be no major change in the future. And so for many Slovak companies business with a green future will remain green for the next five years. The state decided to give to selected companies even more free space as far as emissions are concerned. The most privileged companies can expect quotas increased by tens of percent. (author)

  9. Activity and Life After Survival of a Cardiac Arrest (ALASCA and the effectiveness of an early intervention service: design of a randomised controlled trial

    Directory of Open Access Journals (Sweden)

    Bakx Wilbert GM

    2007-08-01

    Full Text Available Abstract Background Cardiac arrest survivors may experience hypoxic brain injury that results in cognitive impairments which frequently remain unrecognised. This may lead to limitations in daily activities and participation in society, a decreased quality of life for the patient, and a high strain for the caregiver. Publications about interventions directed at improving quality of life after survival of a cardiac arrest are scarce. Therefore, evidence about effective rehabilitation programmes for cardiac arrest survivors is urgently needed. This paper presents the design of the ALASCA (Activity and Life After Survival of a Cardiac Arrest trial, a randomised, controlled clinical trial to evaluate the effects of a new early intervention service for survivors of a cardiac arrest and their caregivers. Methods/design The study population comprises all people who survive two weeks after a cardiac arrest and are admitted to one of the participating hospitals in the Southern part of the Netherlands. In a two-group randomised, controlled clinical trial, half of the participants will receive an early intervention service. The early intervention service consists of several consultations with a specialised nurse for the patient and their caregiver during the first three months after the cardiac arrest. The intervention is directed at screening for cognitive problems, provision of informational, emotional and practical support, and stimulating self-management. If necessary, referral to specialised care can take place. Persons in the control group will receive the care as usual. The primary outcome measures are the extent of participation in society and quality of life of the patient one year after a cardiac arrest. Secondary outcome measures are the level of cognitive, emotional and cardiovascular impairment and daily functioning of the patient, as well as the strain for and quality of life of the caregiver. Participants and their caregivers will be followed

  10. Silicon photonics: some remaining challenges

    Science.gov (United States)

    Reed, G. T.; Topley, R.; Khokhar, A. Z.; Thompson, D. J.; Stanković, S.; Reynolds, S.; Chen, X.; Soper, N.; Mitchell, C. J.; Hu, Y.; Shen, L.; Martinez-Jimenez, G.; Healy, N.; Mailis, S.; Peacock, A. C.; Nedeljkovic, M.; Gardes, F. Y.; Soler Penades, J.; Alonso-Ramos, C.; Ortega-Monux, A.; Wanguemert-Perez, G.; Molina-Fernandez, I.; Cheben, P.; Mashanovich, G. Z.

    2016-03-01

    This paper discusses some of the remaining challenges for silicon photonics, and how we at Southampton University have approached some of them. Despite phenomenal advances in the field of Silicon Photonics, there are a number of areas that still require development. For short to medium reach applications, there is a need to improve the power consumption of photonic circuits such that inter-chip, and perhaps intra-chip applications are viable. This means that yet smaller devices are required as well as thermally stable devices, and multiple wavelength channels. In turn this demands smaller, more efficient modulators, athermal circuits, and improved wavelength division multiplexers. The debate continues as to whether on-chip lasers are necessary for all applications, but an efficient low cost laser would benefit many applications. Multi-layer photonics offers the possibility of increasing the complexity and effectiveness of a given area of chip real estate, but it is a demanding challenge. Low cost packaging (in particular, passive alignment of fibre to waveguide), and effective wafer scale testing strategies, are also essential for mass market applications. Whilst solutions to these challenges would enhance most applications, a derivative technology is emerging, that of Mid Infra-Red (MIR) silicon photonics. This field will build on existing developments, but will require key enhancements to facilitate functionality at longer wavelengths. In common with mainstream silicon photonics, significant developments have been made, but there is still much left to do. Here we summarise some of our recent work towards wafer scale testing, passive alignment, multiplexing, and MIR silicon photonics technology.

  11. The Chinese community patient’s life satisfaction, assessment of community medical service, and trust in community health delivery system

    Science.gov (United States)

    2013-01-01

    Background Although the Chinese government put a lot of effort into promoting the community patient’s life satisfaction, there still lacked the holistic and systematic approaches to promote the community patient’s life satisfaction in various regions of China. On the basis of the literature, it was found that both the community patient’s assessment of community medical service and trust in community health delivery system were important considerations when the community patient comprehensively evaluated community medical service to generate life satisfaction. So this study was set up to test whether and to what extent the community patient’s assessments of various major aspects of community medical service/various major aspects of the community patient’s trust in community health delivery system influenced life satisfaction in whole China/in various regions of China. Methods In order to explore the situation of China’s community health delivery system before 2009 and provide a reference for China’s community health delivery system reform, the data that could comprehensively and accurately reflect the community patient’s life satisfaction, assessment of community medical service, and trust in community health delivery system in various regions of China was needed, so this study collaborated with the National Bureau of Statistics of China to carry out a large-scale 2008 national community resident household survey (N = 3,306) for the first time in China. And the specified ordered probit models were established to analyze the dataset from this household survey. Results Among major aspects of community medical service, the medical cost (particularly in developed regions), the doctor-patient communication (particularly in developed regions), the medical facility and hospital environment (particularly in developed regions), and the medical treatment process (particularly in underdeveloped regions) were all key considerations (ppatient’s life

  12. Ultrasonic assessment of service life of concrete structures subject to reinforcing steel corrosion

    Science.gov (United States)

    Udegbunam, Ogechukwu Christian

    were then used to determine the service life of the structure.

  13. Innovating Technological Process for Expanding the Service Life of Underground Power Cables

    Directory of Open Access Journals (Sweden)

    Tabacaru V.

    2016-08-01

    Full Text Available As a public power distribution operator on low voltage (023/0.4 kV, medium voltage (6 and 20 kV, and high voltage (110 kV in the territory of Galati County, SDEE Galati serves approximately 240,000 consumers (captive and eligible, domestic and non-domestic For this purpose, in the field of medium voltage underground distribution lines, SDEE Galati manages and operates a volume of approx. 500 km UDL/6kV circuit and approximately 630 km UDL/20 kV circuit. Many of these cables which are still in operation, were manufactured with materials and on the technological level of the ’60s,’70s and ‘80s decades and have reached the end of their service life. Evidence does and incident statistics from these networks in which, every year, one of the "tips" is the medium voltage cables damaged "technical wear" normal operating conditions. The current paper will present the main features of an innovating technological process called SPR (Sustained Pressure Rejuvenation, designed for on-site refurbishing of underground power cable insulation medium and high voltage. The process offers a viable alternative that has proven, over the 25 years of application initially on the American content and now on the worldwide, substantially more cost effective than replacing cables. The paper does not propose detailed presentation of the technological process, but to inform the family of energetics NPS about the existence and the benefits of applying this new technological process to the old cable medium and high voltage.

  14. Viscoelastic response of HTPB based solid fuel to horizontal and vertical storage slumping conditions and it's affect on service life

    International Nuclear Information System (INIS)

    Nawaz, Q.; Nizam, F.

    2011-01-01

    Frequent use of solid fuels as thrust generating energy source in modern day space vehicle systems has created a need to assess their serviceability for long term storage under various conditions. Solid fuel grain, the most important part of any solid fuel system, responds visco elastically to any loading condition. For the assessment of the service life of any solid fuel system, the solid fuel grain has to be structurally evaluated in applied storage conditions. Structural integrity of the grain is exceptionally significant to guarantee the successful operation of the solid fuel system. In this work, numerical simulations have been performed to assess the mechanical stresses and strains induced in an HTPB based solid fuel grain during service life employing ABAQUS standard FEA software using 4-node bilinear quadrilateral elements. For finite element analysis (FEA), typical 2-D and p/nth axisymmetric section of 5-point (n) star grain geometry is considered. Mechanical loads include the horizontal or vertical 1-g (solid fuel weight) storage condition. The simulation results are compared with the analytical results for the same grain geometry. Analytically measured slump deflections in grain segment at various storage times have been found in good relation with the FEA based simulation results. This proves the validity of the procedure adopted and is helpful in assessment of the service life of solid fuel systems. (author)

  15. Organizational performance focused on users' quality of life: The role of service climate and "contribution-to-others" wellbeing beliefs.

    Science.gov (United States)

    Pătraș, Luminița; Martínez-Tur, Vicente; Estreder, Yolanda; Gracia, Esther; Moliner, Carolina; Peiró, José María

    2018-06-01

    The investigation of organizational factors as precursors of the quality of life (QoL) of service users in organizations for individuals with intellectual disability has been relatively neglected.With this in mind, this study tests the mediation of service climate between employee's "contribution-to-others" wellbeing beliefs (COWBs) and organizational performance focused on the QoL of individuals with intellectual disability. A total of 104 organizations participated in the study. Data were collected from 885 employees and 809 family members of individuals with intellectual disability. The results of the multilevel mediation model supported the hypotheses. When employees believe that their own wellbeing depends on helping others (COWBs) service climate reported by employees is stimulated. Service climate in turn was associated with organizational performance focused on QoL of people with intellectual disability, assessed by family members. The manuscript concludes with theoretical and practical implications of the study. Copyright © 2018 Elsevier Ltd. All rights reserved.

  16. Transition from children's to adult services for young adults with life-limiting conditions: A realist review of the literature.

    Science.gov (United States)

    Kerr, Helen; Price, Jayne; Nicholl, Honor; O'Halloran, Peter

    2017-11-01

    Improvements in care and treatment have led to more young adults with life-limiting conditions living beyond childhood, which means they must make the transition from children's to adult services. This has proved a challenging process for both young adults and service providers, with complex transition interventions interacting in unpredictable ways with local contexts. To explain how intervention processes interact with contextual factors to help transition from children's to adult services for young adults with life-limiting conditions. Systematic realist review of the literature. Literature was sourced from four electronic databases: Embase, MEDLINE, Science Direct and Cochrane Library from January 1995 to April 2016. This was supplemented with a search in Google Scholar and articles sourced from reference lists of included papers. Data were extracted using an adapted standardised data extraction tool which included identifying information related to interventions, mechanisms, contextual influences and outcomes. Two reviewers assessed the relevance of papers based on the inclusion criteria. Methodological rigor was assessed using the relevant Critical Appraisal Skills Programme tools. 78 articles were included in the review. Six interventions were identified related to an effective transition to adult services. Contextual factors include the need for children's service providers to collaborate with adult service providers to prepare an environment with knowledgeable staff and adequate resources. Mechanisms triggered by the interventions include a sense of empowerment and agency amongst all stakeholders. Early planning, collaboration between children's and adult service providers, and a focus on increasing the young adults' confidence in decision-making and engaging with adult services, are vital to a successful transition. Interventions should be tailored to their context and focused not only on organisational procedures but on equipping young adults, parents

  17. Landslide risk impact management and web services for improving resilience: the LIFE+IMAGINE project approach

    Science.gov (United States)

    Congi, Maria Pia; Campo, Valentina; Cipolloni, Carlo; Delmonaco, Giuseppe; Guerrieri, Luca; Iadanza, Carla; Spizzichino, Daniele; Trigila, Alessandro

    2014-05-01

    The increasing damage caused by natural disasters in the last decades points out the need for interoperable added-value services to support environmental safety and human protection, by reducing vulnerability of exposed elements as well as improving the resilience of the involved communities. For this reason, to provide access to harmonized and customized data is only one of several steps towards delivering adequate support to risk assessment, reduction and management. Scope of the present work is to illustrate a methodology under development for analysis of potential impacts in areas prone to landslide hazard in the framework of the EC project LIFE+IMAGINE. The project aims to implement an infrastructure based on web services for environmental analysis, that integrates in its own architecture specifications and results from INSPIRE, SEIS and GMES. Existing web services will be customized during the project to provide functionalities for supporting the environmental integrated management. The implemented infrastructure will be applied to landslide risk scenarios, to be developed in selected pilot areas, aiming at: i) application of standard procedures to implement a landslide risk analysis; ii) definition of a procedure for assessment of potential environmental impacts, based on a set of indicators to estimate the different exposed elements with their specific vulnerability in the pilot area. More in detail, the landslide pilot will be aimed at providing a landslide risk scenario through the implementation and analysis of: 1) a landslide inventory from available historical databases and maps; 2) landslide susceptibility and hazard maps; 3) assessment of exposure and vulnerability on selected typologies of elements at risk; 4) implementation of a landslide risk scenario for different sets of exposed elements (e.g. population, road network, residential area, cultural heritage). The pilot will be implemented in Liguria, Italy, in two different catchment areas located

  18. FUEL SERVICES: Customer focused on Product Support during the whole Life Time

    Energy Technology Data Exchange (ETDEWEB)

    Langenberger, J.; Hummel, W.

    2015-07-01

    For more than 40 years, Fuel Services of AREVA has been delivering devices and providing on-site services primary at LWR worldwide. We support our worldwide customers in achieving safe and economic operation of the fuel assemblies (FA) and core components (CC) and have received excellent feedback from them. But the Fuel Services support goes beyond on-site activities. (Author)

  19. Analytical Method to Estimate Fatigue Life Time Duration in Service for Runner Blade Mechanism of Kaplan Turbines

    Directory of Open Access Journals (Sweden)

    Ana – Maria Budai

    2010-10-01

    Full Text Available The paper present an analytical method that can be used to determianted fatigue life time duration in service for runner blade mechanism of Kaplan turbines. The study was made for lever button of runer blade mechanism using two analytical relation to calculate the maximum number of stress cycles whereupon the mechanism work without any damage. To estimate fatigue life time duration will be used a formula obtained from one of most comon cumulative damage methodology taking in consideration the real exploatation conditions of a specified Kapaln turbine.

  20. The eSourcing Capability Model for Service Providers: Knowledge Manage-ment across the Sourcing Life-cycle

    OpenAIRE

    Laaksonen, Pekka

    2011-01-01

    Laaksonen, Pekka The eSourcing Capability Model for Service Providers: Knowledge Manage-ment across the Sourcing Life-cycle Jyväskylä: Jyväskylän yliopisto, 2011, 42 s. Tietojärjestelmätiede, kandidaatintutkielma Ohjaaja(t): Käkölä, Timo Tässä kandidaatintutkielmassa selvitettiin sitä, miten the eSourcing Capability Model for Service Providers-mallin käytännöt (practices) ovat liittyneet tietä-myksenhallinnan neljään prosessiin: tiedon luominen, varastointi/noutaminen, jakamine...

  1. Recruitment, soldiers and the experience of army life: compulsory military service in Peru and Colombia (1919-1933

    Directory of Open Access Journals (Sweden)

    Carlos Camacho Arango

    2018-05-01

    Full Text Available The article studies different aspects of mandatory military service in Peru and Colombia from 1919 to 1933 including recruitment; the social, “racial”, and geographical origins of soldiers; and army life in both countries. Documents from military archives in the U.S. and France, as well as writings from Peruvian and Colombian commissioned and non-commissioned officers were the main sources used. The method is comparative and it shows clear features in common, including the scarcity of resources that affected all aspects of service.

  2. Americans’ Tolerance of Racist Materials in Public Libraries Remained Steady between 1976-2006. A Review of: Burke, S. K. (2010. Social tolerance and racist materials in public libraries. Reference and User Services Quarterly, 49(4, 369-379.

    Directory of Open Access Journals (Sweden)

    Leslie Bussert

    2012-03-01

    removing a racist book, only one-third of white respondents did. However, in all but a few subcategories of analysis, the majority of African Americans did not support removal, indicating a great deal of social tolerance on their part despite the possibility of being more sensitive to the implications of having racist materials in the library. When cross-tabulated with education level, the same pattern of support for removal was reproduced. There was little variation over time in white respondent’s opinions while African Americans’ varied slightly.Geographic factors affected opinions supporting removal of racist materials, though place size only had a small impact on opinions. Respondents in the South were most likely to support removal (42.1% and those in New England were least likely (25.2%. About one-third of respondents from the Midwest (33%, Mid-Atlantic (36%, and the West (29.8% supported removal. Opinions over time remained the same in all regions but the South, whose support of removal dropped to 38.8%.Religion was found to correlate with opinions on removing racist books from the library. Protestants showed the highest level of support for removal (39.5%, followed by Catholics (32.3%, Jews (21.7%, and respondents unaffiliated with religion (20.5%. Race had a strong impact within some religions on supporting removal, particularly among Methodists and those claiming no religion. When opinions by religion were cross-tabulated with education level, at every level Baptists were more likely to support removal than other groups, while Jews and those without religious affiliation were least likely.Other demographic variables had little effect on opinions concerning removal of racist materials from the library. Parents supported removal (37% while nonparents were less likely to (30%, and men and women were almost equally likely to support removal (33% and 37% respectively. Political affiliation and level of conservatism only showed slight effects on opinions supporting

  3. Durapgulf, a local service life model for the durability of concrete structures in the South of Iran

    International Nuclear Information System (INIS)

    Shekarchi, M.; Ghods, P.; Alizadeh, R.; Chini, M.; Hoseini, M.

    2008-01-01

    Reinforced concrete structures were widely constructed in the south of Iran for the infrastructures of ports and oil exploration. Unfortunately, the deterioration of concrete structures in this marine area, which is mainly due to the chloride-induced corrosion of rebars in concrete, imposes hundreds of millions dollars of repair cost every year. During the last decades, extensive studies have been conducted to evaluate the effect of different parameters on chloride diffusion into concrete, corrosion initiation, and its propagation. In order to predict the time required for various steps of the corrosion phenomena, many numerical models have been developed. In this paper, development of Durapgulf (a service of life design model), which can predict the corrosion initiation of reinforced concrete (RC) structures in the south of Iran, is described and also the application of this model for service life design of RC structures is demonstrated in a hypothetical example and verified with other experimental results in this region. (author)

  4. Methodology for the Life Cycle Assessment of a Car-sharing Service

    OpenAIRE

    Guyon, Olivier

    2017-01-01

    Nowadays, circular economy is becoming more relevant in society. In the context of the automotive industry, we no longer simply work on emissions emitted during the vehicle use phase but rather on the environmental impacts induced during all phases of the vehicle's life cycle (manufacturing, logistics, use, maintenance and end of life). For this purpose, many automakers, including the Group PSA, use life cycle assessment (LCA) to determine these environmental impacts. Also, the economy of sha...

  5. Comparing the Life Cycle Energy Consumption, Global Warming and Eutrophication Potentials of Several Water and Waste Service Options

    Directory of Open Access Journals (Sweden)

    Xiaobo Xue

    2016-04-01

    Full Text Available Managing the water-energy-nutrient nexus for the built environment requires, in part, a full system analysis of energy consumption, global warming and eutrophication potentials of municipal water services. As an example, we evaluated the life cycle energy use, greenhouse gas (GHG emissions and aqueous nutrient releases of the whole anthropogenic municipal water cycle starting from raw water extraction to wastewater treatment and reuse/discharge for five municipal water and wastewater systems. The assessed options included conventional centralized services and four alternative options following the principles of source-separation and water fit-for-purpose. The comparative life cycle assessment identified that centralized drinking water supply coupled with blackwater energy recovery and on-site greywater treatment and reuse was the most energy- and carbon-efficient water service system evaluated, while the conventional (drinking water and sewerage centralized system ranked as the most energy- and carbon-intensive system. The electricity generated from blackwater and food residuals co-digestion was estimated to offset at least 40% of life cycle energy consumption for water/waste services. The dry composting toilet option demonstrated the lowest life cycle eutrophication potential. The nutrients in wastewater effluent are the dominating contributors for the eutrophication potential for the assessed system configurations. Among the parameters for which variability and sensitivity were evaluated, the carbon intensity of the local electricity grid and the efficiency of electricity production by the co-digestion with the energy recovery process were the most important for determining the relative global warming potential results.

  6. Control of the Onboard Microgravity Environment and Extension of the Service Life of the Long-Term Space Station

    Science.gov (United States)

    Titov, V. A.

    2018-03-01

    The problem of control of the on-board microgravity environment in order to extend the service life of the long-term space station has been discussed. Software developed for the ISS and the results of identifying dynamic models and external impacts based on telemetry data have been presented. Proposals for controlling the onboard microgravity environment for future long-term space stations have been formulated.

  7. NASA's Evolutionary Xenon Thruster (NEXT) Project Qualification Propellant Throughput Milestone: Performance, Erosion, and Thruster Service Life Prediction After 450 kg

    Science.gov (United States)

    Herman, Daniel A.

    2010-01-01

    The NASA s Evolutionary Xenon Thruster (NEXT) program is tasked with significantly improving and extending the capabilities of current state-of-the-art NSTAR thruster. The service life capability of the NEXT ion thruster is being assessed by thruster wear test and life-modeling of critical thruster components, such as the ion optics and cathodes. The NEXT Long-Duration Test (LDT) was initiated to validate and qualify the NEXT thruster propellant throughput capability. The NEXT thruster completed the primary goal of the LDT; namely to demonstrate the project qualification throughput of 450 kg by the end of calendar year 2009. The NEXT LDT has demonstrated 28,500 hr of operation and processed 466 kg of xenon throughput--more than double the throughput demonstrated by the NSTAR flight-spare. Thruster performance changes have been consistent with a priori predictions. Thruster erosion has been minimal and consistent with the thruster service life assessment, which predicts the first failure mode at greater than 750 kg throughput. The life-limiting failure mode for NEXT is predicted to be loss of structural integrity of the accelerator grid due to erosion by charge-exchange ions.

  8. Duty and Service: Life and Career of a Tamil Teacher of English in Sri Lanka

    Science.gov (United States)

    Hayes, David

    2010-01-01

    This article discusses the life and career of a Tamil teacher of English working in the government education system in northern Sri Lanka. Based on data gathered in an extended life history interview, the article explores the teacher's own experiences of schooling, his reasons for entering teaching as a profession, his professional training, and…

  9. Population cycles: generalities, exceptions and remaining mysteries

    Science.gov (United States)

    2018-01-01

    Population cycles are one of nature's great mysteries. For almost a hundred years, innumerable studies have probed the causes of cyclic dynamics in snowshoe hares, voles and lemmings, forest Lepidoptera and grouse. Even though cyclic species have very different life histories, similarities in mechanisms related to their dynamics are apparent. In addition to high reproductive rates and density-related mortality from predators, pathogens or parasitoids, other characteristics include transgenerational reduced reproduction and dispersal with increasing-peak densities, and genetic similarity among populations. Experiments to stop cyclic dynamics and comparisons of cyclic and noncyclic populations provide some understanding but both reproduction and mortality must be considered. What determines variation in amplitude and periodicity of population outbreaks remains a mystery. PMID:29563267

  10. Biodiversity and ecosystem services in life cycle impact assessment – Inventory objects or impact categories?

    DEFF Research Database (Denmark)

    Callesen, Ingeborg

    2016-01-01

    P's, namely ‘biodiversity’ and ‘ecosystem services’. The AoP biodiversity has more emphasis on intrinsic (existence) values than on utilitarian, functional value perceptions that are covered by the AoP ecosystem services. Ecosystem services can in some aspects be substituted or restored, whereas certain...

  11. Counseling and Connecting with the Military Undergraduate: The Intersection of Military Service and University Life

    Science.gov (United States)

    Bonar, Ted C.; Domenici, Paula L.

    2011-01-01

    The majority of military undergraduates at universities are National Guard and Reserve personnel and prior-service military veterans, all difficult to identify on campus. These students face unique cultural challenges. Though the academic literature primarily addresses disability services and administrative programs often focus on "wounded…

  12. Service-learning abroad: a life-changing experience for nursing students.

    Science.gov (United States)

    Hawkins, Janice Evans; Vialet, Channel L

    2012-01-01

    Incorporating service-learning experiences into nursing education is one way to help prepare students for practice in a global, culturally diverse society. Partnering with a church with a long-term mission program in El Salvador offers the nursing school at Old Dominion University opportunity to develop a service-learning program and support healthcare missions.

  13. The effect of quality circles on job satisfaction and quality of work-life of staff in emergency medical services.

    Science.gov (United States)

    Hosseinabadi, Reza; Karampourian, Arezou; Beiranvand, Shoorangiz; Pournia, Yadollah

    2013-10-01

    Quality circles, as a participatory management technique, offer one alternative for dealing with frustration and discontent of today's workers. This study was conducted to investigate the effect of implementation of quality circles on nurses' quality of work-life and job satisfaction. In this study, two emergency medical services (EMS) of Hamedan province were selected and randomly assigned as the experimental and control groups. After the experimental group was trained and quality circles were established in this group, the levels of quality of work-life and job satisfaction were measured in the two groups. Then, the statistical analyses were performed using t-test. After the intervention, the results showed significant differences between the scores of motivational factors (p=0.001), the total scores of job satisfaction (p=0.003), and the scores of some quality of work life (QWL) conceptual categories including the use and development of capacities (p=0.008), the total space of life (p=0.003), and the total scores of QWL (p=0.031) in the experimental group compared to those in the control group. This study confirms the effectiveness of quality circles in improving quality of work-life and job satisfaction of nurses working in EMS, and offers their application as a management method that can be used by EMS managers. Copyright © 2012 Elsevier Ltd. All rights reserved.

  14. Impact of low vision services on the quality of life of low vision patients in Ghana

    Directory of Open Access Journals (Sweden)

    Godwin O. Ovenseri-Ogbomo

    2016-03-01

    Full Text Available Patients’ perspectives on the impact of clinical interventions have been recognised as critical elements in patient care. Quality-of-life instruments are designed to measure these perspectives. We used the National Eye Institute’s 25-item Visual Function Questionnaire (NEI VFQ to measure the impact of optical low vision devices on the quality of life of 22 low vision patients who obtained and were using low vision devices from a secondary low vision clinic in the Eastern Region, Ghana. The study employed a pre- and post-intervention technique. We found statistically significant improvements in measured visual acuity and NEI VFQ scores in 8 of the 10 domains evaluated. We conclude that optical low vision devices have a positive impact on the quality of life of low vision patients in Ghana. Keywords: low vision; quality of life; visual acuity; visual impairment; Ghana

  15. "It Gave Me My Life Back": An Evaluation of a Specialist Legal Domestic Abuse Service.

    Science.gov (United States)

    Lea, Susan J; Callaghan, Lynne

    2016-05-01

    Community-based advocacy services are important in enabling victims to escape domestic abuse and rebuild their lives. This study evaluated a domestic abuse service. Two phases of research were conducted following case-file analysis (n = 86): surveys (n = 22) and interviews (n = 12) with victims, and interviews with key individuals (n = 12) based in related statutory and community organizations. The findings revealed the holistic model of legal, practical, mental health-related, and advocacy components resulted in a range of benefits to victims and enhanced interagency partnership working. Core elements of a successful needs-led, victim-centered service could be distilled. © The Author(s) 2015.

  16. Effect of Coal Contaminants on Solid Oxide Fuel System Performance and Service Life

    Energy Technology Data Exchange (ETDEWEB)

    Krishnan, Gopala N.; Jayaweera, Palitha; Perez, Jordi; Hornbostel, M.; Albritton, John R.; Gupta, Raghubir P.

    2007-10-31

    samples suffered less than 1% in when exposed to contaminants such as HCl(g), Hg(g), and Zn(g), and SbO(g) at levels of 8 ppm and above. AsH3 vapor at 0.5 ppm did not affect the electrical performance of an SOFC sample even after 1000 h at 750°C. In Phase II of the program, long-term tests will be performed with multiple contaminants at a temperature range of 750° to 850°C. These tests will be at contaminant levels typical of coal-derived gas streams that have undergone gas cleanup using Selexol technology. The chemical nature of the contaminant species will be identified at the operating temperature of SOFC and compare them with thermodynamic equilibrium calculations. The results of the testing will be used to recommend the sensitivity limits for SOFC operation and to assess the reduction in the service life of the SOFC for trace level contaminants.

  17. The experiences of remaining nurse tutors during the transformation ...

    African Journals Online (AJOL)

    The transformation of public services and education in South Africa is part of the political and socioeconomic transition to democracy. Changes are occurring in every fi eld, including that of the health services. A qualitative study was undertaken to investigate the experiences of the remaining nurse tutors at a school of ...

  18. A Comparative Assessment of Life-Cycle Greenhouse Gas Emissions from Hypothetical Electric Airport Transportation Services in Thailand

    Science.gov (United States)

    Koiwanit, J.

    2018-05-01

    Global warming is an increase of average temperature in the atmosphere, which causes adverse effects on the environment. Carbon dioxide (CO2) from transportation sector is one of the main contributors of the overall greenhouse gases (GHG). To cope with this issue, electric car services are increasingly seen as popular alternative modes of green transportation especially for urban cities as it is more flexible, more environmentally-friendly, and less expensive than the use of conventional vehicles. The study analyses and compare the hypothetical electric car systems from airport transportation services. Center of Environmental Science of Leiden University (CML) 2001, the Life Cycle Impact Assessment (LCIA) method, is applied to convert life cycle inventory data into environmental impacts. The observed results showed that the electric shuttle bus had the highest impact in global warming potential (GWP) compared to other transportation types. Alternatively, this Life Cycle Assessment (LCA) study that evaluated different transportations provided important information for decision makers on quantifying the differences between each scenario.

  19. Factors influencing the end of the service life of protective gloves used in car repair shops: a preliminary report.

    Science.gov (United States)

    Emilia, Irzmańska; Agnieszka, Stefko; Katarzyna, Dyńska-Kukulska

    2015-01-01

    The paper presents the results of an end-of-service-life study on 2 kinds of protective gloves designed for workplaces in which workers are exposed to mineral oils and mechanical factors. The authors developed their own end-of-service-life study method that takes into account factors occurring during real-life use of protective gloves. The examined gloves were subjected to mechanical, chemical, and physical factors. The objective of the study was to compare the protective in new gloves subjected to a laboratory simulation test and in gloves used at workplaces in car repair shops. A further goal was to design a glove assessment procedure that would ensure comprehensive analysis of the actual level of performance provided by gloves exposed to selected chemical and mechanical factors as well as subjected to the influence of temperature and humidity, mechanical damage, and chemical degradation of material. The results lead to the conclusion that simultaneous exposure of protective gloves to mechanical, chemical, and physical factors significantly decreases their performance levels. Furthermore, similar performance levels were obtained for gloves subjected to laboratory simulation tests and for those used in the workplace.

  20. Prediction of fatigue life under service loading using the relative method

    International Nuclear Information System (INIS)

    Buch, A.

    1982-01-01

    Fatigue life estimates obtained with the local strain approach (LSA) and with the conventional nominal stress approach (NSA) were compared with experimental results obtained on notched AlCuMg2 aircraft material specimens with flight simulation random tensile loading. The effect of change of the reference stress, of the loading program and of some changes in the loading frequency distribution, on the ratio Nsub(exp)/Nsub(pred) was investigated. A material strain-life curve, a cyclic stress-strain curve. The Neuber-Topper rule Ksub(sigma) x Ksub(epsilon) = K 2 = const. and a K value estimated with an exact two-parameter notch factor formula for the case R = 0, N = 10 7 were used for life predictions. (orig./RW) [de

  1. Predicting the residual life of plant equipment - Why worry

    International Nuclear Information System (INIS)

    Jaske, C.E.

    1985-01-01

    Predicting the residual life of plant equipment that has been in service for 20 to 30 years or more is a major concern of many industries. This paper reviews the reasons for increased concern for residual-life assessment and the general procedures used in performing such assessments. Some examples and case histories illustrating procedures for assessing remaining service life are discussed. Areas where developments are needed to improve the technology for remaining-life estimation are pointed out. Then, some of the critical issues involved in residual-life assessment are identified. Finally, the future role of residual-life prediction is addressed

  2. Effectiveness of various public private partnership pavement rehabilitation treatments: A big data informatics survival analysis of pavement service life : final report.

    Science.gov (United States)

    2017-09-29

    Past research efforts have used a wide variety of methodological approaches to analyze pavement performance indicators, pavement rehabilitation treatments, and pavement service life. Using big data informatics methods, the intent of this study is to ...

  3. Influence of accessibility of services on Quality of Life of school children with Cerebral Palsy in Latvia

    Directory of Open Access Journals (Sweden)

    Cibule L.

    2012-10-01

    Full Text Available The aim of the study was to investigate the influence of accessibility of services and health related factors on Quality of Life (QoL of school children with Cerebral Palsy (CP in Latvia. 80 children 47 boys and 33 girls with CP and their parents from all regions of Latvia took part in the study. Mean age of participants was 11,7 (SD± 3,5 years. 50 children without diagnosed chronic diseases formed the control group. Validated evaluation tools were used in the study (KIDSCREEN-52, GMFCS- E&R. The results show lower QoL in children with CP in comparison with their healthy peers and European children. QoL is influenced by the level of gross motor functions, lack of coordination of services, lack of rehabilitation infrastructure and presence of environmental barriers in Latvia.

  4. Structure and hot-rolled reinforcement rods properties evolution in the process of long service life

    International Nuclear Information System (INIS)

    Mikryukov, V.R.; Syomin, A.P.; Konovalov, S.V.; Ivanov, Yu.F.; Gromov, V.E.

    2006-01-01

    The physical nature of mechanical properties of hot-rolled reinforcement rods degradation during long-life operation is established by methods of transmission diffraction electron microscopy. It is shown that strength and plasticity properties decrease is due to cementite plates cutting and dissolution, microcracks formation process as a result of interstitial phase inclusions creation in the near-surface layer of material

  5. Structure and hot-rolled reinforcement rods properties evolution in the process of long service life

    Energy Technology Data Exchange (ETDEWEB)

    Mikryukov, V R [Siberian State Industrial University, Kirov str., 42. 654007, Novokuznetsk (Russian Federation); Syomin, A P [Siberian State Industrial University, Kirov str., 42. 654007, Novokuznetsk (Russian Federation); Konovalov, S V [Siberian State Industrial University, Kirov str., 42. 654007, Novokuznetsk (Russian Federation); Ivanov, Yu F [Siberian State Industrial University, Kirov str., 42. 654007, Novokuznetsk (Russian Federation); Gromov, V E [Siberian State Industrial University, Kirov str., 42. 654007, Novokuznetsk (Russian Federation)

    2006-08-25

    The physical nature of mechanical properties of hot-rolled reinforcement rods degradation during long-life operation is established by methods of transmission diffraction electron microscopy. It is shown that strength and plasticity properties decrease is due to cementite plates cutting and dissolution, microcracks formation process as a result of interstitial phase inclusions creation in the near-surface layer of material.

  6. Integrating Speech-Language Pathology Services in Palliative End-of-Life Care

    Science.gov (United States)

    Pollens, Robin D.

    2012-01-01

    Clinical speech-language pathologists (SLPs) may receive referrals to consult with teams serving patients who have a severe and/or terminal disease. Palliative care focuses on the prevention or relief of suffering to maximize quality of life for these patients and their families. This article describes how the role of the SLP in palliative care…

  7. Multi-objective optimization of swash plate forging process parameters for the die wear/service life improvement

    Science.gov (United States)

    Hu, X. F.; Wang, L. G.; Wu, H.; Liu, S. S.

    2017-12-01

    For the forging process of the swash plate, the author designed a kind of multi-index orthogonal experiment. Based on the Archard wear model, the influences of billet temperature, die temperature, forming speed, top die hardness and friction coefficient on forming load and die wear were numerically simulated by DEFORM software. Through the analysis of experimental results, the best forging process parameters were optimized and determined, which could effectively reduce the die wear and prolong the die service life. It is significant to increase the practical production of enterprise, especially to reduce the production cost and to promote enterprise profit.

  8. Treatment for cases of violence by Brazilian emergency services focusing on family relationships and life cycles.

    Science.gov (United States)

    Avanci, Joviana Quintes; Pinto, Liana Wernersbach; Assis, Simone Gonçalves de

    2017-09-01

    This article analyzes data regarding cases of domestic violence treated by the emergency services through the following: the sociodemographic characteristics of the people who were treated; the events themselves; the evolution of care (from childhood to old age by gender); and the factors that differentiate cases of domestic violence compared to those committed by non-family members. Data from 24 Brazilian state capitals and the Federal District were analyzed, comprising 86 emergency services: a total of 4,893 individuals were surveyed. Of those people who were treated by emergency services, 26.6% suffered domestic violence: 40.0% were children/adolescents, 57.2% were adults and 2.8% were elderly. The adjusted model, which compared victims of violence committed by other family members with those who were not family members, showed that males were less likely to suffer from domestic violence; those that had fewer years of education were at increased risk; and that women were more likely to commit domestic violence compared to the category of "both genders". This study reinforces the fact that health sector professionals need to be able to deal with domestic violence by providing support, performing good practices, abiding by care protocols, taking care of injuries, and facilitating access to other services.

  9. Self-rated health and quality of life in adults attending regional disability services in Ireland.

    LENUS (Irish Health Repository)

    Boland, Máirín C

    2009-04-01

    There is limited background information on self-rated health in people with disability in Ireland. This paper examines self-rated health scores and dimensions of functioning in people attending disability services and compares scores to the general population in Ireland, which has not been done before.

  10. Water for Life: The Impact of the Privatization of Water Services on Child Mortality.

    Science.gov (United States)

    Galiani, Sebastian; Gertler, Paul; Schargrodsky, Ernesto

    2005-01-01

    While most countries are committed to increasing access to safe water and thereby reducing child mortality, there is little consensus on how to actually improve water services. One important proposal under discussion is whether to privatize water provision. In the 1990s Argentina embarked on one of the largest privatization campaigns in the world,…

  11. Aircraft Engine Life-Consumption Monitoring for Real-Time Reliability Determination, Phase II

    Data.gov (United States)

    National Aeronautics and Space Administration — The object of this research is to develop an in-service life-monitor system for the prediction of the remaining component and system life of aircraft engines. The...

  12. A Shifting Paradigm of Work-Life Balance in Service Context-An Empirical Study

    OpenAIRE

    A.K.M.Mominul Haque Talukder

    2011-01-01

    Purpose: The study examined the effect of various ‘work-life balance’ determinants such as employee benefits, work environment, workload, flextime and discrimination on work culture and job satisfaction. Introduction: In the second half of the last century, tremendous environmental, economic, political, and socio cultural changes contributed to the restructuring of couples in their relation to work. Literature review: Several fundamental changes in family and work structures, such as the part...

  13. Services

    International Nuclear Information System (INIS)

    Hardeman, F.

    1998-01-01

    The objectives of the services section is (1) to offer complete services in health-physics measurements according to international quality standards, (2) to improve continuously these measurement techniques and to follow up international recommendations and legislation concerning the surveillance of workers, (3) to support and advise nuclear and non-nuclear industry on problems of radioactive contamination. Achievements related to gamma spectrometry, whole-body counting, beta and alpha spectrometry, dosimetry, radon measurements, calibration, instrumentation, and neutron activation analysis are described

  14. Guidelines for evaluating the environmental performance of Product/Service-Systems through life cycle assessment

    DEFF Research Database (Denmark)

    Kjær, Louise Laumann; Pigosso, Daniela C. A.; McAloone, Tim C.

    2018-01-01

    Product/Service-Systems (PSS) such as integrated solutions, performance-based contracts or sharing systems are often proposed as means to enable improved environmental sustainability. However, PSS are not necessarily environmentally benign compared to conventional systems. Quantitative environmen......Product/Service-Systems (PSS) such as integrated solutions, performance-based contracts or sharing systems are often proposed as means to enable improved environmental sustainability. However, PSS are not necessarily environmentally benign compared to conventional systems. Quantitative....... In this article, we propose a set of guidelines consisting of six steps, which elaborates the LCA process with respect to the specific consideration for PSS assessment. The guidelines were developed based on identified challenges for the application of LCA on PSS, a review of existing LCAs on PSS case studies...

  15. Quality of working life and workload in home help services: a review of the literature and a proposal for a research model.

    NARCIS (Netherlands)

    Arts, S.E.J.; Kerkstra, A.; Zee, J. van der; Huyer Abu-Saad, H.

    2001-01-01

    In this literature review, several models for quality of working life and workload appropriate for home help services are presented. The aim was to develop a model for assessing the psychological and physical outcomes of working in home help services. Although the models described in this review

  16. A study comparing changes in loading conditions of an extended service life system using aluminum 2024-T351

    Science.gov (United States)

    Beal, Roger Zack

    The current fiscally austere environment prevalent in the military and industry is driving extreme measures to save money. In the United States Air Force, this has driven enormous efforts to trim sustainment spending on extended life aircraft. The challenge to the aerospace engineer is to ensure flight safety in the midst of this economic pressure. One method of cutting costs is to increase the time an aircraft is in service by delaying the point when the aircraft is taken out of service for depot maintenance. To ensure flight safety, in depth fatigue and fracture analysis needs to be accomplished to assess increasing the inspection interval. The purpose of this study was to determine the sensitivity of Aluminum 2024-T351 alloy, a common material used in tension dominated aerospace applications, to two different loading spectra---one that is aggressive and the other that is benign. This was accomplished by conducting five different combinations of the two spectra, developing computer simulations using the AFGROW software and comparing with the measured data. The results showed that the material demonstrated significantly different behavior between the two spectra. These results provide a valuable tool for the aerospace engineer for fatigue life prediction and inspection interval evaluation.

  17. Role of compostable tableware in food service and waste management. A life cycle assessment study.

    Science.gov (United States)

    Fieschi, Maurizio; Pretato, Ugo

    2018-03-01

    It is estimated that in Europe 88-100 million tonnes of food waste are generated every year, with a Global Warming Potential (GWP) of around 227 MT of CO 2 equivalents generated for their collection and disposal. A 12% of this waste is estimated to arise from food service within the hospitality sector, which includes quick service restaurants, casual and fine dining, contract catering (canteens, prisons, hospitals, schools etc.) as well as indoor and outdoor events and exhibitions. Given this considerable amount and that the mixed unsorted collection is often the only practicable way to handle such waste flows, the choice of tableware and cutlery can make a big difference in facilitating waste collection as well as in reducing the overall environmental impact of food waste management. This study compares the environmental performance of using biodegradable & compostable single use tableware with organic recycling of food waste through composting against a traditional scenario using fossil-based plastic tableware and disposal of the waste flows through incineration and landfill. The study has taken into account the main requirements of the recently published Product Environmental Footprint (PEF) methodology of the European Commission. The results confirm that the use of biodegradable and compostable tableware combined with organic recycling is the preferred option for catering in quick service restaurants, contract catering and events, since it reduces significantly the carbon, water and resource footprint and is fully in line with the principles of a circular economy. Copyright © 2017 Elsevier Ltd. All rights reserved.

  18. System innovation and life cycle management in service packaging 230: Tarjoilupakkausten systeemi- innovaatio ja elinkaaren hallinta

    Energy Technology Data Exchange (ETDEWEB)

    Aarnio, T. [McDonald' s Oy, Helsinki. (Finland)

    2004-07-01

    International fast food restaurant company McDonald's Oy operates its 87 restaurants in Finland at 38 different communities. An integral part of its environmental work is material flow management. Material flow is homogenous due to the centralized supply of food, service packages, and other utensils. However, different local waste regulations make it extremely challenging to standardize material flow on company level. The project initiated in 1.4.2002 and ended 31.12.2003. Its main target was to increase recycling of used service packaging either as material or as energy. The possibility to develop an efficient recycling system for the whole company was studied. The introduced system consists of (1) the optimized amount of fractions, (2) the selection of recyclable materials, especially service packaging material, (3) the customer friendly sorting station at dining area, (4) means to reach fraction purity at the acceptable level, (5) the efficient fraction logistics, as well as (6) the minimizing amount of landfill waste. This report summarizes the key findings and future challenges identified in the project. (orig.)

  19. DEVELOPMENT OF CUSTOMER RELATIONSHIP MANAGEMENT SYSTEM TO IMPROVE SERVICE QUALITY IN PT MANULIFE LIFE INSURANCE INDONESIA

    Directory of Open Access Journals (Sweden)

    Chriswanto Chriswanto

    2014-10-01

    Full Text Available Customer Relationship Management System (CRMS Development in order to improve service quality in PT. AJ. Manulife Indonesia is done by comprehending the performance model of the company and the factors that are affecting the company performance improvement and the quality of the decision to be taken by top management. System Dynamic is a method that can be used to stimulate complex systems. System Dynamics approach is expected to build a model of corporate performance that can be used to evaluate the quality of service to customers so that they can make decisions quickly and accurately. This study proves that the model is built with standard models used as changing targets and it can simulate a target quality of service to customers by delivering current and future achievement. Achievement in the future is influenced by the value of achievement of SLA, Response Time, and Defect, where the greater value of control, the greater value of the correction rate so that the GAP will be smaller. Correction rate which is determined in this study was 10%, 20%, and 30% of GAP (CB

  20. Behavioral and quality-of-life outcomes in different service models for methadone maintenance treatment in Vietnam.

    Science.gov (United States)

    Tran, Bach Xuan; Nguyen, Long Hoang; Nong, Vuong Minh; Nguyen, Cuong Tat; Phan, Huong Thu Thi; Latkin, Carl A

    2016-02-02

    Integrating HIV/AIDS and methadone maintenance treatment (MMT) services with existing health care delivery system is critical in sustaining efforts to fight HIV/AIDS in large injection-driven epidemics. However, efficiency of different integrative service models is unknown. This study assessed behavioral and health-related quality-of-life (HRQOL) outcomes of MMT in four service delivery models and explored factors associated with these outcomes of interest. A cross-sectional survey was conducted in two HIV epicenters in Vietnam: Hanoi and Nam Dinh Province. All patients in five selected MMT clinics were invited to participate, and 1016 were interviewed (80-90% response rate). Respondents had a mean age of 35.8, taken MMT for average 16.5 months and 3.3% on MMT for 36-60 months. The MMT integrated with rural district health center (DHC) has the highest prevalence of concurrent drug use (11.3%). The percentage of condom use (last sexual intercourse) with primary and casual partners was lowest in the MMT at urban DHCs. Patients at the rural DHC reported very high proportions of pain/discomfort (37.8%), anxiety/depression (43.1%), and mobility (13.3%). In regression models, poorer HRQOL outcomes were found in MMT models in the rural areas or without general health care, and among those patients who were HIV positive, reported concurrent drug use, and had higher numbers of previous drug rehabilitation episodes. Mobility and anxiety/depression are factors that increased the likelihood of concurrent drug use among MMT patients. Outcomes of MMT were diverse across different integrative service models. Policies on rapid expansion of the MMT program in Vietnam should also emphasize on the integration with comprehensive health care services including psychological supports for patients.

  1. LifeSteps: An Evidence-based Health Promotion Program for Underserved Populations – A Community Service Learning Approach

    Directory of Open Access Journals (Sweden)

    Melanie Austin-McCain

    2015-04-01

    Full Text Available Chronic diseases are the most common, costly, and preventable of all health problems in the United States. Chronic diseases represent the leading causes of death and are experienced at higher rates by minority populations (CDC, 2012. Innovative community-based health promotion programs are recommended that meet the diverse needs of underserved populations (Yeary, et al., 2011. LifeSteps is being developed as an evidence-based health promotion program focusing on health and wellness, a domain area defined within the Occupational Therapy Practice Framework (OTPF, 2008. LifeSteps will utilize a client-centered approach to coach individuals in making health behavior changes. Fieldwork and service-learning components are incorporated integrating clinical practice, academic study, and collaboration with community providers. Program evaluation measures based on the Transtheoretical Model (TTM have been identified to address all phases of program planning. The LifeSteps health promotion program aligns with local, national, and international objectives and addresses the need for programs that meet the diverse needs of underserved populations. Occupational therapists are in a unique position for implementing community-based interventions that promote health and contribute to a healthier society.

  2. Semiempirical Methodology for Estimating the Service Life of Concrete Deck Panels Strengthened with Fiber-Reinforced Polymer

    Directory of Open Access Journals (Sweden)

    Eon-Kyoung Kim

    2014-01-01

    Full Text Available Deterioration of concrete bridge decks affects their durability, safety, and function. It is therefore necessary to conduct structural rehabilitation of damaged concrete decks by strengthening them with fiber-reinforced polymer. Of the recent studies on the strengthened structures, most have focused on static behavior; only a few studies have investigated fatigue behavior. Accurate analysis of fatigue in concrete deck performance requires a more realistic simulated moving load. This study developed a theoretical live-load model to reflect the effect of moving vehicle loads, based on a statistical approach to the measurement of real traffic loads over various time periods in Korea. It assessed the fatigue life and strengthening effect of bridge decks strengthened with either carbon fiber sheets or grid carbon fiber polymer plastic using probabilistic and reliability analyses. It used extrapolations and simulations to derive maximum load effects for time periods ranging from 1 day to 75 years. Limited fatigue tests were conducted and probabilistic and reliability analyses were carried out on the strengthened concrete bridge deck specimens to predict the extended fatigue life. Analysis results indicated that strengthened concrete decks provide sufficient resistance against increasing truck loads during the service life of a bridge.

  3. Value Retention, Service Life, Use Intensity and Long-Term Productivity of Wood Chippers as Obtained from Contractor Records

    Directory of Open Access Journals (Sweden)

    Raffaele Spinelli

    2017-12-01

    Full Text Available Acknowledging the absence of up-to-date empirical data on the value retention, service life and annual use of chipping machinery, in 2017 the authors surveyed the records kept by 50 contractors offering biomass chipping services. The machine fleet and operations in this survey could be taken as representative for most of Europe, where the biomass sector is well established and is facing further expansion. Data collection included the whole chipping unit, comprised of chipper, carrier and loader. Manually-fed units were excluded from the survey. The data pointed at a service life up to and exceeding 10,000 h and 10 years, which relieved any concerns about poor durability. Value retention was good, and may exceed that of other mainstream forestry equipment. Engine power was the main explanatory variable in any models to predict purchase price and productivity. The effect of this variable could explain most of the variability (>80% in the purchase price and productivity data. Results also pointed at the essential equivalence in price and productivity between PTO-driven (i.e., tractor powered and independent-engine chippers, once differences in engine power are accounted for. However, the distribution of purchase price between different components of the chipping unit was different between the two unit types, with the chipper accounting for a larger proportion of the total investment in independent-engine units. Machine power was also different, with most PTO-driven units being significantly smaller than independent-engine units, due to the limitations of existing tractors. Furthermore, half of the carriers assigned to a PTO-driven unit were subject to flexible use, i.e., they were not solely used for chipping work.

  4. Service life monitoring of the main components at the Temelin nuclear power plant

    International Nuclear Information System (INIS)

    Hahn, J.; Vincour, D.

    2007-01-01

    Knowledge and experience gained from the introduction and periodical implementation of life assessment of the major components of the Temelin nuclear power plant is summarized. The initial Soviet technical design of the plant did not incorporate lifetime monitoring and evaluation, therefore it was completed with demonstrative strength and lifetime calculations from Czech companies. Moreover, a Westinghouse primary circuit diagnosis and monitoring system, including the monitoring of temperature and pressure cycles for low-cycle fatigue evaluation, was installed at the plant. The DIALIFE code for the calculation of mainly the low-cycle fatigue of the key pressure components, was developed and installed subsequently as a superstructure to the monitoring system. (author)

  5. Composite Service Life Prediction via Fiber Bundle Testing. Evaluation of Testing Equipment and Data Acquisition System

    Science.gov (United States)

    1986-12-01

    strength critical application for modern composites were filament-wound pressure vessels using glass fibers. What has highly motivated the effort of...stiffness to weight ratios the use of which is of cruisial importance in the aerospace industry. Another highly motivating aspect was the very high...single filament r’iber testing and can become more 29 3> C o - Pwo PwS ?w4 Pw3 Pw2 Pwl PSD Ps5 PS4 Ps3 Ps2 PS! homoiogous correspondence t ~ to Life ( Laqt

  6. The Interrelation of Prayer and Worship Service Attendance in Moderating the Negative Impact of Life Event Stressors on Mental Well-Being.

    Science.gov (United States)

    Rainville, G

    2017-09-13

    The interrelation of worship service attendance and private prayer in moderating the negative impact of life event stressors on mental well-being is examined using hierarchical multiple regressions on a national sample of 2601 Americans. A theoretical model is proposed in which stressful life events are made less distressing under conditions in which exposure to pro-social content at worship services is internalized through frequent private prayer. Interactive models controlling for a block of potential confounds are run to confirm that the stress-moderating effects of worship service attendance are noted only when attendance is complemented by relatively frequent engagement in private prayer.

  7. Public health approaches to end-of-life care in the UK: an online survey of palliative care services.

    Science.gov (United States)

    Paul, Sally; Sallnow, Libby

    2013-06-01

    The public health approach to end-of-life care has gained recognition over the past decade regarding its contribution to palliative care services. Terms, such as health-promoting palliative care, and compassionate communities, have entered the discourse of palliative care and practice; examples exist in the UK and globally. This scoping study aimed to determine if such initiatives were priorities for hospices in the UK and, if so, provide baseline data on the types of initiatives undertaken. An online survey was designed, piloted and emailed to 220 palliative care providers across the four UK countries. It included a total of six questions. Quantitative data were analysed using descriptive statistics. Qualitative data were analysed thematically. There was a 66% response rate. Of those providers, 60% indicated that public health approaches to death, dying and loss were a current priority for their organisation. Respondents identified a range of work being undertaken currently in this area. The most successful were felt to be working with schools and working directly with local community groups. The findings demonstrate the relevance of a public health approach for palliative care services and how they are currently engaging with the communities they serve. Although the approach was endorsed by the majority of respondents, various challenges were highlighted. These related to the need to balance this against service provision, and the need for more training and resources to support these initiatives, at both national and community levels.

  8. The effect of service satisfaction and spiritual well-being on the quality of life of patients with schizophrenia.

    Science.gov (United States)

    Lanfredi, Mariangela; Candini, Valentina; Buizza, Chiara; Ferrari, Clarissa; Boero, Maria E; Giobbio, Gian M; Goldschmidt, Nicoletta; Greppo, Stefania; Iozzino, Laura; Maggi, Paolo; Melegari, Anna; Pasqualetti, Patrizio; Rossi, Giuseppe; de Girolamo, Giovanni

    2014-05-15

    Quality of life (QOL) has been considered an important outcome measure in psychiatric research and determinants of QOL have been widely investigated. We aimed at detecting predictors of QOL at baseline and at testing the longitudinal interrelations of the baseline predictors with QOL scores at a 1-year follow-up in a sample of patients living in Residential Facilities (RFs). Logistic regression models were adopted to evaluate the association between WHOQoL-Bref scores and potential determinants of QOL. In addition, all variables significantly associated with QOL domains in the final logistic regression model were included by using the Structural Equation Modeling (SEM). We included 139 patients with a diagnosis of schizophrenia spectrum. In the final logistic regression model level of activity, social support, age, service satisfaction, spiritual well-being and symptoms' severity were identified as predictors of QOL scores at baseline. Longitudinal analyses carried out by SEM showed that 40% of QOL follow-up variability was explained by QOL at baseline, and significant indirect effects toward QOL at follow-up were found for satisfaction with services and for social support. Rehabilitation plans for people with schizophrenia living in RFs should also consider mediators of change in subjective QOL such as satisfaction with mental health services. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.

  9. Models for estimation of service life of concrete barriers in low-level radioactive waste disposal

    International Nuclear Information System (INIS)

    Walton, J.C.; Plansky, L.E.; Smith, R.W.

    1990-09-01

    Concrete barriers will be used as intimate parts of systems for isolation of low level radioactive wastes subsequent to disposal. This work reviews mathematical models for estimating the degradation rate of concrete in typical service environments. The models considered cover sulfate attack, reinforcement corrosion, calcium hydroxide leaching, carbonation, freeze/thaw, and cracking. Additionally, fluid flow, mass transport, and geochemical properties of concrete are briefly reviewed. Example calculations included illustrate the types of predictions expected of the models. 79 refs., 24 figs., 6 tabs

  10. Models for estimation of service life of concrete barriers in low-level radioactive waste disposal

    Energy Technology Data Exchange (ETDEWEB)

    Walton, J.C.; Plansky, L.E.; Smith, R.W. (EG and G Idaho, Inc., Idaho Falls, ID (USA))

    1990-09-01

    Concrete barriers will be used as intimate parts of systems for isolation of low level radioactive wastes subsequent to disposal. This work reviews mathematical models for estimating the degradation rate of concrete in typical service environments. The models considered cover sulfate attack, reinforcement corrosion, calcium hydroxide leaching, carbonation, freeze/thaw, and cracking. Additionally, fluid flow, mass transport, and geochemical properties of concrete are briefly reviewed. Example calculations included illustrate the types of predictions expected of the models. 79 refs., 24 figs., 6 tabs.

  11. End-of-Life Care and Discussions in Japanese Geriatric Health Service Facilities: A Nationwide Survey of Managing Directors' Viewpoints.

    Science.gov (United States)

    Kanoh, Asako; Kizawa, Yoshiyuki; Tsuneto, Satoru; Yokoya, Shoji

    2018-01-01

    Geriatric health service facilities (GHSFs) play important roles as intermediate care facilities for elderly individuals temporarily when they need rehabilitation before returning home. However, the number of residents spending their end-of-life (EOL) period in such facilities is increasing. To improve the quality of EOL care, end-of-life discussions (EOLDs) are recommended by some guidelines and studies. This study aimed to clarify the current practice of EOL care and EOLDs in GHSFs in Japan. We conducted a nationwide cross-sectional survey by mailing questionnaires about EOL care and EOLDs to 3437 GHSF managing directors. The questionnaire was developed through a literature review and discussion among the researchers and experts. Descriptive statistics summarized the data. We also analyzed the factors related to GHSFs conducting EOLDs using Fisher exact tests. The response rate was 20.7% (713 of 3437). Among the respondents, 75.2% (536 of 713) of GHSFs provided EOL care and 73.1% (521 of 713) conducted EOLDs. The most common reasons for difficulties in providing EOL care included the lack of EOL education for nurses and care workers, and their fear about caring for dying residents. End-of-life discussions were mostly initiated after the deterioration of a resident's condition and were conducted with families by physicians. Statistically significant factors of GHSFs conducting EOLDs included providing EOL education for nurses and care workers, availability of private room for critically ill residents, emergency on-call doctors, and EOL care. Adequate practical staff education programs for EOL care including EOLDs may be crucial for quality of end-of-life care in aged care facilities.

  12. Service life prediction. Development of models for predicting the service life of power plant components subject to thermomechanical creep fatigue; Lebensdauervorhersage. Entwicklung von Modellen zur Lebensdauervorhersage von Kraftwerksbauteilen unter thermisch-mechanischer Kriechermuedungsbeanspruchung. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Cui, L.; Scholz, A. [Technische Univ. Darmstadt (Germany). Institut fuer Werkstoffkunde; Hartrott, P. von; Schlesinger, M. [Fraunhofer-Institut fuer Werkstoffmechanik (IWM), Freiburg im Breisgau (Germany)

    2009-07-01

    Extensive use is made of massive components of heat resistant and highly heat resistant materials in installations of the power and heating industry. These components are exposed to varying thermomechanical stress as a result of ramping-up and down processes. In this research project two computer-assisted methods of predicting service life until crack initiation were extended to include cases of thermomechanical multi-axis stress conducive to creep fatigue and of superposition of high-cycle stress on power plant components. Investigations were limited to rotor steel of type X12CrMoWVNbN10-1-1. Complex thermomechanical multi-axis experiments were performed on round, notched and cruciform test specimens of close-to-life dimensions in order to demonstrate by experiment the validity of these models. The results of these calculations showed an acceptable degree of agreement between experiment and simulation for both models. Calculations on earlier TMF experiments performed at IfW on hollow specimens of 1%CrMoNiV showed good predictability for both the SARA and the ThoMat programme. Calculations on experiments performed at MPA Stuttgart on model bodies consisting of the same 1%CrMoNiV showed a predictability of acceptable variability considering the complexity of the stresses involved. A further outcome of this project is that the use of SARA appears universally suitable for the construction of new plants and in the service area, while the use of ThoMat appears suited for detail optimisation in the development process.

  13. Urinary incontinence symptoms and impact on quality of life in patients seeking outpatient physical therapy services.

    Science.gov (United States)

    Alappattu, Meryl; Neville, Cynthia; Beneciuk, Jason; Bishop, Mark

    2016-01-01

    The objective of this study was to examine the frequency and types of urinary incontinence (UI) in patients seeking outpatient physical therapy for neuro-musculoskeletal conditions. Retrospective cross-sectional analysis. A convenience sample of patients that positively responded to a UI screening question was included in this study. Data were collected for age, sex, and primary treatment condition classified into one of the following (i.e., urinary dysfunction, fecal dysfunction, pelvic pain, spine, neurological disorders, or extremity disorders); UI type (i.e., mixed, urge, stress, or insensible); UI symptom severity; and quality of life (QoL) impact. Frequency of UI type, symptom severity, health-related quality of life (HRQoL) impact, and pad use were compared between treatment groups. The mean age of the sample (n = 599) was 49.8 years (SD = 18.5) and 94.7% were female. The urinary dysfunction group comprised 44.2% of the total sample, followed by the spine group with 25.7% and pelvic pain with 17.2%. The urinary dysfunction group scored significantly higher on UI symptom severity and impact on QoL compared to the pelvic pain and spine groups, but not compared to the extremity disorders, fecal dysfunction, or neurological disorder group. These preliminary data indicate that UI is a condition afflicting many individuals who present to outpatient physical therapy beyond those seeking care for UI. We recommend using a simple screening measure for UI and its impact on HRQoL as part of a routine initial evaluation in outpatient physical therapy settings.

  14. Life Saving Apps: Linking Cardiac Arrest Victims to Emergency Services and Volunteer Responders.

    Science.gov (United States)

    Lim Choi Keung, Sarah N; Khan, Mohammed O; Smith, Christopher; Perkins, Gavin; Murphy, Paddie; Arvanitis, Theodoros N

    2016-01-01

    In cases of emergency, such as out-of-hospital cardiac arrests, the first few minutes are crucial for victims to receive care and have a positive outcome. However, emergency services often arrive on scene after those first few minutes, making any bridging solutions key. Finding a defibrillator or accessing a trained volunteer responder are some of the technological solutions that are being developed to support the chain of survival. This paper looks at technologies, in particular those linked to mobile apps that have been used to locate defibrillators and responder apps that enable responders to attend to nearby emergencies. We review a selection of apps and also assess the challenges and considerations for such apps.

  15. A Qualitative Study of Service Provision for Alcohol Related Health Issues in Mid to Later Life.

    Directory of Open Access Journals (Sweden)

    Catherine Haighton

    Full Text Available Epidemiological surveys over the last 20 years show a steady increase in the amount of alcohol consumed by older age groups. Physiological changes and an increased likelihood of health problems and medication use make older people more likely than younger age groups to suffer negative consequences of alcohol consumption, often at lower levels. However, health services targeting excessive drinking tend to be aimed at younger age groups. The aim of this study was to gain an in-depth understanding of experiences of, and attitudes towards, support for alcohol related health issues in people aged 50 and over.Qualitative interviews (n = 24, 12 male/12 female, ages 51-90 years and focus groups (n = 27, 6 male/21 female, ages 50-95 years were carried out with a purposive sample of participants who consumed alcohol or had been dependent.Participants' alcohol misuse was often covert, isolated and carefully regulated. Participants tended to look first to their General Practitioner for help with alcohol. Detoxification courses had been found effective for dependent participants but only in the short term; rehabilitation facilities were appreciated but seen as difficult to access. Activities, informal groups and drop-in centres were endorsed. It was seen as difficult to secure treatment for alcohol and mental health problems together. Barriers to seeking help included functioning at a high level, concern about losing positive aspects of drinking, perceived stigma, service orientation to younger people, and fatalistic attitudes to help-seeking. Facilitators included concern about risk of fatal illness or pressure from significant people.Primary care professionals need training on improving the detection and treatment of alcohol problems among older people. There is also a compelling need to ensure that aftercare is in place to prevent relapse. Strong preferences were expressed for support to be provided by those who had experienced alcohol problems themselves.

  16. Cloud-Based Service Information System for Evaluating Quality of Life after Breast Cancer Surgery.

    Directory of Open Access Journals (Sweden)

    Hao-Yun Kao

    Full Text Available Although recent studies have improved understanding of quality of life (QOL outcomes of breast conserving surgery, few have used longitudinal data for more than two time points, and few have examined predictors of QOL over two years. Additionally, the longitudinal data analyses in such studies rarely apply the appropriate statistical methodology to control for censoring and inter-correlations arising from repeated measures obtained from the same patient pool. This study evaluated an internet-based system for measuring longitudinal changes in QOL and developed a cloud-based system for managing patients after breast conserving surgery.This prospective study analyzed 657 breast cancer patients treated at three tertiary academic hospitals. Related hospital personnel such as surgeons and other healthcare professionals were also interviewed to determine the requirements for an effective cloud-based system for surveying QOL in breast cancer patients. All patients completed the SF-36, Quality of Life Questionnaire (QLQ-C30 and its supplementary breast cancer measure (QLQ-BR23 at baseline, 6 months, 1 year, and 2 years postoperatively. The 95% confidence intervals for differences in responsiveness estimates were derived by bootstrap estimation. Scores derived by these instruments were interpreted by generalized estimating equation before and after surgery.All breast cancer surgery patients had significantly improved QLQ-C30 and QLQ-BR23 subscale scores throughout the 2-year follow-up period (p<0.05. During the study period, QOL generally had a negative association with advanced age, high Charlson comorbidity index score, tumor stage III or IV, previous chemotherapy, and long post-operative LOS. Conversely, QOL was positively associated with previous radiotherapy and hormone therapy. Additionally, patients with high scores for preoperative QOL tended to have high scores for QLQ-C30, QLQ-BR23 and SF-36 subscales. Based on the results of usability testing

  17. Challenges in the Licensing of New Nuclear Power Plant, Service Life Extension of Operating Ones (Safeguards-Safety-Security Aspects)

    International Nuclear Information System (INIS)

    Horvath, K.

    2016-01-01

    The Hungarian Atomic Energy Authority (HAEA), as the Hungarian nuclear regulator is faced with dual challenges meant by the licensing of the planned construction of two AES-2006 type nuclear power plant units and the licensing of the service life extension of the existing units that have been operating for more than 30 years. The HAEA has full regulatory competence; its mission is to oversee the safety and security of all the peaceful applications of atomic energy. Accordingly, the licensing scope covers safeguards, safety as well as security. The paper shows the current status of the Hungarian nuclear programme and the future plans, as well as summarizes the regulatory approach followed by HAEA. (author)

  18. The effect of crack width on the service life of reinforced concrete structures

    Science.gov (United States)

    Van Hung, Nguyen; Viet Hung, Vu; Viet, Tran Bao

    2018-04-01

    Reinforced concrete has become a widely used construction material around the world. Nowadays, the assessment of deterioration and life expectancy of reinforced concrete structure is very important and necessary as concrete is a complex material with brittle failure. Under the effect of load and over time, cracks occur in the structure, significantly reducing its performance and durability. Therefore, a number of models for predicting the penetration of chloride ions into the concrete were proposed to assess the durability of the structure. In the study performed by T B Viet (2016) [1], the author proposed a new theoretical model, especially considering the effects of macro and micro cracking on the diffusion coefficient of chloride ion in the cracked concrete. The following experimental results, in term of electrical indication of concrete’s ability to resist chloride ion penetration, are used to calculate the lifespan of a reinforced concrete structure according to Dura Crete approach [8] with different crack widths to evaluate the accuracy and reliability of the above model in the range of concrete compressive strength of 30-70MPa.

  19. Life saving or money wasting? Perceptions of caesarean sections among users of services in rural Bangladesh.

    Science.gov (United States)

    Parkhurst, Justin Oliver; Rahman, Syed Azizur

    2007-03-01

    Bangladesh has a high level of maternal mortality, corresponding to one of the world's lowest rates of use of skilled birth attendance (12.1%), and a similarly low rate of caesarean births (2.4%). While increasing the proportion of women who deliver with professional medical care is essential to prevent maternal deaths, past work has identified distrust of caesarean procedures in Bangladesh. The reasons behind this distrust can manifest itself in health seeking behaviour around maternal care. This paper presents findings from a qualitative study of 30 women in a rural district of Bangladesh who recently delivered in a health facility. It finds that the distrust in doctor's recommendations for surgery stemmed from high costs incurred and a belief that it was used when not medically justified. This could lead to women avoiding or leaving medical facilities in extreme cases. Some women's experiences further illustrated disagreement among medical staff as to whether or not a caesarean procedure should be done, with conflicting financial incentives for doctors to perform caesarean deliveries, and for nurses and midwives to conduct normal deliveries. Policy makers must recognise that the fears women hold of caesarean deliveries may not simply be rooted in ignorance and may, in fact, reflect legitimate concerns with medical practice. Ultimately, it will be essential to address problems in the health systems environment, which may promote improper service provision.

  20. The relationship between health literacy and quality of life among frequent users of health care services: a cross-sectional study.

    Science.gov (United States)

    Couture, Éva Marjorie; Chouinard, Maud-Christine; Fortin, Martin; Hudon, Catherine

    2017-07-06

    Although health literacy and quality of life are important concepts in health care, the link between them is unclear, especially for a population of frequent users of health care services with chronic diseases. Low health literacy is a common problem that has been linked to several negative health outcomes. Quality of life is an important health outcome in patient-centered care. Frequent users of health care services are a vulnerable population that deserves attention due to high costs and negative outcomes such as lower quality of life and higher mortality. The objective of this study was to examine the relationship between health literacy and the physical and mental components of quality of life among frequent users of health care services with chronic diseases. This study presents the cross-sectional analysis of data collected through the V1SAGES project, a randomized controlled trial on the effectiveness of a case management intervention in primary care in Quebec, Canada. Participants (n = 247) were frequent users of health care services presenting at least one chronic condition. Health literacy was measured by the Newest Vital Sign (NVS), and the physical and mental components of quality of life were evaluated by the Short Form Health Survey Version 2 (SF-12v2). The association between health literacy (independent variable) and the physical and mental components of quality of life was examined using biserial correlation. No association was found between health literacy and quality of life (physical component: r = 0.108, ρ = 0.11; mental component: r = 0.147, ρ = 0.15). This study suggests that there is no relationship between health literacy and the physical and mental components of quality of life among frequent users of health care services. NCT01719991 . Registered October 25, 2012.

  1. Authentic leadership: becoming and remaining an authentic nurse leader.

    Science.gov (United States)

    Murphy, Lin G

    2012-11-01

    This article explores how chief nurse executives became and remained authentic leaders. Using narrative inquiry, this qualitative study focused on the life stories of participants. Results demonstrate the importance of reframing, reflection in alignment with values, and the courage needed as nurse leaders progress to authenticity.

  2. Quality of life of depressed and suicidal patients seeking services from traditional and faith healers in rural Kenya.

    Science.gov (United States)

    Musyimi, Christine W; Mutiso, Victoria N; Nayak, Sameera S; Ndetei, David M; Henderson, David C; Bunders, Joske

    2017-05-08

    In rural Kenya, traditional and faith healers provide an alternative pathway to health care, including mental health care. However, not much is known about the characteristics of the populations they serve. The purpose of this study was to determine the relationship between depression, suicidal ideation, and socio-demographic variables with Quality of Life (QoL) indicators in a sample seeking mental health services from traditional and faith healers in rural Kenya. Understanding QoL in this sample can help develop mental health policy and training to improve the well-being of this population. This was a cross-sectional epidemiological survey (n = 443) conducted over a period of 3 months among adult patients seeking care from traditional and faith healers in rural Kenya. Data were collected using the Beck Depression Inventory II (BDI-II), Beck Scale for Suicide Ideation (BSS) and WHO Quality of Life Survey- BREF (WHOQOL-BREF), and analyzed using correlation analyses, parametric tests, and regression analyses. Increasing levels of depression were associated with lower QoL among patients seeking care from traditional and faith healers. BSS scores were significantly negatively correlated with overall, physical, psychological, and environmental QoL, p Kenya. Evidence suggests that traditional and faith healers treat patients with a variety of QoL issues. Further research should focus on understanding how these issues tie into QoL, and how these healers can target these to improve care.

  3. Semantic-JSON: a lightweight web service interface for Semantic Web contents integrating multiple life science databases.

    Science.gov (United States)

    Kobayashi, Norio; Ishii, Manabu; Takahashi, Satoshi; Mochizuki, Yoshiki; Matsushima, Akihiro; Toyoda, Tetsuro

    2011-07-01

    Global cloud frameworks for bioinformatics research databases become huge and heterogeneous; solutions face various diametric challenges comprising cross-integration, retrieval, security and openness. To address this, as of March 2011 organizations including RIKEN published 192 mammalian, plant and protein life sciences databases having 8.2 million data records, integrated as Linked Open or Private Data (LOD/LPD) using SciNetS.org, the Scientists' Networking System. The huge quantity of linked data this database integration framework covers is based on the Semantic Web, where researchers collaborate by managing metadata across public and private databases in a secured data space. This outstripped the data query capacity of existing interface tools like SPARQL. Actual research also requires specialized tools for data analysis using raw original data. To solve these challenges, in December 2009 we developed the lightweight Semantic-JSON interface to access each fragment of linked and raw life sciences data securely under the control of programming languages popularly used by bioinformaticians such as Perl and Ruby. Researchers successfully used the interface across 28 million semantic relationships for biological applications including genome design, sequence processing, inference over phenotype databases, full-text search indexing and human-readable contents like ontology and LOD tree viewers. Semantic-JSON services of SciNetS.org are provided at http://semanticjson.org.

  4. Stress and quality of life among parents of children with congenital heart disease referred for psychological services.

    Science.gov (United States)

    Kaugars, Astrida; Shields, Clarissa; Brosig, Cheryl

    2018-01-01

    The study examined parent stress and health-related quality of life (HRQOL) among families of children with congenital heart disease (CHD) referred for psychological services. Parents of 54 children (85% boys) aged 3 to 13 (M age  = 7.48, SD = 2.38) completed measures to assess parenting stress (Parenting Stress Index - Short Form; Pediatric Inventory for Parents) and the PedsQL Family Impact Module. Medical information was retrieved from medical record review. Half of parents of children with single ventricle anatomy had clinically significant levels of parenting stress. Parents of children with single ventricle anatomy reported more frequent illness-related stress and more difficulty dealing with illness-related stress than parents of children with two ventricle anatomy. Younger gestational age at birth and referral for attention or behavior problems were associated with greater likelihood of parent at-risk psychosocial functioning. Among children referred for psychological services, many parents report significant stress and significant negative impact of the child's medical condition on the family. Results underscore the need to consider assessing parent psychosocial functioning and providing additional support for parents of children with CHD. © 2017 Wiley Periodicals, Inc.

  5. Life-long Services in the Field of Information and Communication Technologies (ICT in Romania during 2004-2007

    Directory of Open Access Journals (Sweden)

    Manuela Sofia Stănculescu

    2009-01-01

    Full Text Available This study presents the results of empirical research on life-long services in the domain of information and communication technologies (ICT carried out within the framework of the project Matching educational supply with labour market in ICT sector in Romania: horizon 2015, co-ordinated by Institute of World Economy. Survey sample includes all providers authorised by National Council for Adult Vocational Training (CNFPA, a part of EDCL certification bodies, Microsoft Net Academy (programme implemented by universities, but also by a specialized firm in vocational training selected in survey, Cisco Net Academy, in total 215 vocational training providers from all around the country, out of which 77 (36% are private companies. Empirical research results (52% response rate allowed to analyze the actual state of vocational training supply in Romania in the period 2004-2007, including: (i identifying the main pratices, strategies and problems of vocational training services providers in ICT sector; ii emphasizing the main characteristics of lifelong learning programmes in ICT sector provided between 2004 and 2007; (iii determining the programme types and their target segment of population; and (iv pointing out the mechanisms of adjusting the supply to labour market needs.

  6. Dementia as a determinant of social and health service use in the last two years of life 1996-2003

    Directory of Open Access Journals (Sweden)

    Raitanen Jani

    2011-04-01

    Full Text Available Abstract Background Dementia is one of the most common causes of death among old people in Finland and other countries with high life expectancies. Dementing illnesses are the most important disease group behind the need for long-term care and therefore place a considerable burden on the health and social care system. The aim of this study was to assess the effects of dementia and year of death (1998-2003 on health and social service use in the last two years of life among old people. Methods The data were derived from multiple national registers in Finland and comprise all those who died in 1998, 2002 or 2003 and 40% of those who died in 1999-2001 at the age of 70 or over (n = 145 944. We studied the use of hospitals, long-term care and home care in the last two years of life. Statistics were performed using binary logistic regression analyses and negative binomial regression analyses, adjusting for age, gender and comorbidity. Results The proportion of study participants with a dementia diagnosis was 23.5%. People with dementia diagnosis used long-term care more often (OR 9.30, 95% CI 8.60, 10.06 but hospital (OR 0.33, 95% CI 0.31, 0.35 and home care (OR 0.50, 95% CI 0.46, 0.54 less often than people without dementia. The likelihood of using university hospital and long-term care increased during the eight-year study period, while the number of days spent in university and general hospital among the users decreased. Differences in service use between people with and without dementia decreased during the study period. Conclusions Old people with dementia used long-term care to a much greater extent and hospital and home care to a lesser extent than those without dementia. This difference persisted even when controlling for age, gender and comorbidity. It is important that greater attention is paid to ensuring that old people with dementia have equitable access to care.

  7. Brief screening for traumatic life events in female university health service patients

    Directory of Open Access Journals (Sweden)

    Susan B. Watson

    2007-01-01

    Full Text Available El cribado rutinario de pacientes de atención primaria expuestos a sucesos vitales traumáticos y, particularmente, al trauma por ataque, puede producir beneficios para pacientes y sistemas sanitarios. Sin embargo, tal cribado no ha sido todavía ampliamente adoptado. Para examinar la validez y la utilidad clínica del cribado conciso del trauma en pacientes de atención primaria, se evaluó desde este estudio instrumental la exposición al trauma en una muestra de pacientes universitarias (N = 339. La validez discriminante de una escueta pregunta auto-administrada de cribado sobre la exposición al trauma, perteneciente al módulo de trastorno de estrés postraumático (TEPT de la Structured Clinical Interview for DSM-IV (SCID, fue comparada con un inventario más largo de sucesos vitales traumáticos, el Traumatic Life Events Questionnaire. Dos versiones de la escueta pregunta de cribado fueron evaluadas para determinar su grado de exactitud para identificar a las participantes que informaron de ataque sexual o físico, y/o síntomas de TEPT. La escueta pregunta identificó a más de tres cuartas partes de las supervivientes al ataque traumático y al 96% de mujeres que cumplían los criterios del TEPT. Más del 40% de las participantes informó de al menos un ataque física o sexualmente traumático. El cuatro por ciento de aquellas que no informaron de ataque traumático y una tercera parte que informó de ataque traumático cumplían los criterios para el TEPT. Los resultados sugieren que una escueta pregunta de cribado acerca del trauma por ataque puede ser útil en contextos donde más procedimientos de evaluación que requieren más tiempo no son prácticos.

  8. Harm reduction services as a point-of-entry to and source of end-of-life care and support for homeless and marginally housed persons who use alcohol and/or illicit drugs: a qualitative analysis.

    Science.gov (United States)

    McNeil, Ryan; Guirguis-Younger, Manal; Dilley, Laura B; Aubry, Tim D; Turnbull, Jeffrey; Hwang, Stephen W

    2012-05-17

    Homeless and marginally housed persons who use alcohol and/or illicit drugs often have end-of-life care needs that go unmet due to barriers that they face to accessing end-of-life care services. Many homeless and marginally housed persons who use these substances must therefore rely upon alternate sources of end-of-life care and support. This article explores the role of harm reduction services in end-of-life care services delivery to homeless and marginally housed persons who use alcohol and/or illicit drugs. A qualitative case study design was used to explore end-of-life care services delivery to homeless and marginally housed persons in six Canadian cities. A key objective was to explore the role of harm reduction services. 54 health and social services professionals participated in semi-structured qualitative interviews. All participants reported that they provided care and support to this population at end-of-life. Harm reduction services (e.g., syringe exchange programs, managed alcohol programs, etc.) were identified as a critical point-of-entry to and source of end-of-life care and support for homeless and marginally housed persons who use alcohol and/or illicit drugs. Where possible, harm reduction services facilitated referrals to end-of-life care services for this population. Harm reduction services also provided end-of-life care and support when members of this population were unable or unwilling to access end-of-life care services, thereby improving quality-of-life and increasing self-determination regarding place-of-death. While partnerships between harm reduction programs and end-of-life care services are identified as one way to improve access, it is noted that more comprehensive harm reduction services might be needed in end-of-life care settings if they are to engage this underserved population.

  9. FAMILY-WORK CONFLICT AND LIFE SATISFACTION AMONG WORKERS OF ANKARA YOUTH SERVICES AND PROVINCIAL DIRECTORATE OF SPORTS ACCORDING TO DIFFERENT VARIABLES

    OpenAIRE

    Mustafa Önder; Burhan; Emrah

    2016-01-01

    In this study Work-Family Conflict, Family-Work Conflict and Life Satisfaction were carried out to indicate 329 staff’s relationship between each other, who work in Ankara Youth Services and Sports Province Management, by determining whether work-family conflict, family-work conflict and life satisfaction differientiate or not according to socio-demographic variables. According to obtained results, it was concluded that gender, age, having management position, number of children and duration ...

  10. Health-Related Quality of Life: Expanding a Conceptual Framework to Include Older Adults Who Receive Long-Term Services and Supports

    Science.gov (United States)

    Zubritsky, Cynthia; Abbott, Katherine M.; Hirschman, Karen B.; Bowles, Kathryn H.; Foust, Janice B.; Naylor, Mary D.

    2013-01-01

    For older adults receiving long-term services and supports (LTSS), health-related quality of life (HRQoL) has emerged as a critical construct to examine because of its focus on components of well-being, which are affected by progressive changes in health status, health care, and social support. HRQoL is a health-focused quality of life (QOL)…

  11. Feasibility of a UK community-based, eTherapy mental health service in Greater Manchester: repeated-measures and between-groups study of 'Living Life to the Full Interactive', 'Sleepio' and 'Breaking Free Online' at 'Self Help Services'.

    Science.gov (United States)

    Elison, Sarah; Ward, Jonathan; Williams, Chris; Espie, Colin; Davies, Glyn; Dugdale, Stephanie; Ragan, Kathryn; Chisnall, Leanne; Lidbetter, Nicky; Smith, Keith

    2017-07-20

    There is increasing evidence to support the effectiveness of eTherapies for mental health, although limited data have been reported from community-based services. Therefore, this service evaluation reports on feasibility and outcomes from an eTherapy mental health service. 'Self Help Services', an Increasing Access to Psychological Therapies (IAPT) eTherapy service in Greater Manchester. 1068 service users referred to the service for secondary care for their mental health difficulties. Participants were triaged into one of three eTherapy programmes: 'Living Life to the Full Interactive' for low mood, stress and anxiety; 'Sleepio' for insomnia; and 'Breaking Free Online' for substance misuse, depending on clinical need. Standardised psychometric assessments of depression, anxiety and social functioning, collected as part of the IAPT Minimum Data Set, were conducted at baseline and post-treatment. Data indicated baseline differences, with the Breaking Free Online group having higher scores for depression and anxiety than the Living Life to the Full Interactive (depression CI 1.27 to 3.21, pmental health scores were found within all three groups (all pmental health difficulties (pmental health difficulties and suggest that eTherapies may be a useful addition to treatment offering in community-based services. © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

  12. The importance of content and face validity in instrument development: lessons learnt from service users when developing the Recovering Quality of Life measure (ReQoL).

    Science.gov (United States)

    Connell, Janice; Carlton, Jill; Grundy, Andrew; Taylor Buck, Elizabeth; Keetharuth, Anju Devianee; Ricketts, Thomas; Barkham, Michael; Robotham, Dan; Rose, Diana; Brazier, John

    2018-07-01

    Service user involvement in instrument development is increasingly recognised as important, but is often not done and seldom reported. This has adverse implications for the content validity of a measure. The aim of this paper is to identify the types of items that service users felt were important to be included or excluded from a new Recovering Quality of Life measure for people with mental health difficulties. Potential items were presented to service users in face-to-face structured individual interviews and focus groups. The items were primarily taken or adapted from current measures and covered themes identified from earlier qualitative work as being important to quality of life. Content and thematic analysis was undertaken to identify the types of items which were either important or unacceptable to service users. We identified five key themes of the types of items that service users found acceptable or unacceptable; the items should be relevant and meaningful, unambiguous, easy to answer particularly when distressed, do not cause further upset, and be non-judgemental. Importantly, this was from the perspective of the service user. This research has underlined the importance of service users' views on the acceptability and validity of items for use in developing a new measure. Whether or not service users favoured an item was associated with their ability or intention to respond accurately and honestly to the item which will impact on the validity and sensitivity of the measure.

  13. Lifetime health effects and medical costs of integrated stroke services - a non-randomized controlled cluster-trial based life table approach

    Directory of Open Access Journals (Sweden)

    Dirks Maaike

    2010-11-01

    Full Text Available Abstract Background Economic evaluation of stroke services indicates that such services may lead to improved quality of life at affordable cost. The present study assesses lifetime health impact and cost consequences of stroke in an integrated service setting. Methods The EDISSE study is a prospective non-randomized controlled cluster trial that compared stroke services (n = 151 patients to usual care (n = 187 patients. Health status and cost trial-data were entered in multi-dimensional stroke life-tables. The tables distinguish four levels of disability which are defined by the modified Rankin scale. Quality-of-life scores (EuroQoL-5D, transition and survival probabilities are based on concurrent Dutch follow-up studies. Outcomes are quality-adjusted life years lived and lifetime medical cost by disability category. An economic analysis compares outcomes from a successful stroke service to usual care, by bootstrapping individual costs and effects data from patients in each arm. Results Lifetime costs and QALYs after stroke depend on age-of-onset of first-ever stroke. Lifetime QALYs after stroke are 2.42 (90% CI - 0.49 - 2.75 for male patients in usual care and 2.75 (-0.61; 6.26 for females. Lifetime costs for men in the usual care setting are €39,335 (15,951; 79,837 and €42,944 (14,081; 95,944 for women. A comparison with the stroke service results in an ICER of €11,685 saved per QALY gained (€14,211 and €7,745 for men and women respectively. This stroke service is with 90% certainty cost-effective. Conclusions Our analysis shows the potential of large health benefits and cost savings of stroke services, taking a lifetime perspective, also in other European settings.

  14. Remaining in Workforce – Employment Barriers for People with Disabilities in a Swedish Context

    Directory of Open Access Journals (Sweden)

    Gunnel Östlund

    2018-02-01

    Full Text Available Participation in the workforce is lower among people with disabilities worldwide. In this study we explore how people with disabilities perceive their inclusion in working life. Twenty women and men were interviewed. The sample comprises a group of working people experiencing different kinds of physical and sensory disabilities. The employment barriers found were related to accessibility, cooperation among welfare agencies, technical aids and welfare services. We named them as follows: the environmental participation barrier, the jungle of devices, the catch 22 situations, and, the inflexibility of welfare services. According to our interpretation these external barriers hinder people with disabilities from engaging in work and civic life to the extent that they want. Most interviewees in our sample were well-educated and successfully employed, nevertheless they all had experienced barriers in relation to remaining in work. Although the intentions in Sweden and most welfare states is to include people with disabilities in working life there are several obstacles in implementation of this intention.

  15. [Compatibility of Work and Family Life of Employees in the Healthcare Sector: An Issue in Health Services Research].

    Science.gov (United States)

    Lukasczik, Matthias; Ahnert, Jutta; Ströbl, Veronika; Vogel, Heiner; Donath, Carolin; Enger, Ilka; Gräßel, Elmar; Heyelmann, Lena; Lux, Heidemarie; Maurer, Jochen; Özbe, Dominik; Spieckenbaum, Stefanie; Voigtländer, Elzbieta; Wildner, Manfred; Zapf, Andreas; Zellner, Angela; Hollederer, Alfons

    2017-05-18

    Background Healthcare professionals are confronted with specific work-related demands that influence work-family relations and might indirectly affect the quality of healthcare. This paper seeks to provide an overview of the current state of research on this topic of relevance to health services research. The overview may serve as a starting point for modifying structures in the healthcare system (especially in rural regions) with the aim of improving work-family compatibility. Methods A systematic national and international literature search was conducted in terms of a scoping review. The following criteria/contents to be covered in publications were defined: work-family compatibility; work-family interface and work-family conflict in employees working in healthcare; healthcare professions in rural areas and links with work-family issues; interventions to improve work-family compatibility. 145 publications were included in the overview. Results The available literature focuses on physicians and nursing staff while publications on other professions are largely lacking. The methodological quality of existing studies is mostly low, including a lack of meta-analyses. Several studies document dissatisfaction in physicians and nursing staff regarding reconciliation of work and family life. Only few intervention studies were found that seek to improve work-life compatibility; few of them focus on employees in healthcare. There are also deficits with respect to linking work-family issues with aspects of healthcare in rural areas. Conclusions There is a shortage of systematic national and international research regarding work-family compatibility, especially when it comes to the evaluation of interventions. The overview provides starting points for improving work-family compatibility in healthcare. © Georg Thieme Verlag KG Stuttgart · New York.

  16. Unmet Support Service Needs and Health-Related Quality of Life among Adolescents and Young Adults with Cancer: The AYA HOPE Study

    Directory of Open Access Journals (Sweden)

    Ashley Wilder Smith

    2013-04-01

    Full Text Available Introduction: Cancer for adolescents and young adults (AYA differs from younger and older patients; AYA face medical challenges while navigating social and developmental transitions. Research suggests that these patients are under- or inadequately served by current support services, which may affect health-related quality of life (HRQOL.Methods: We examined unmet service needs and HRQOL in the National Cancer Institute’s Adolescent and Young Adult Health Outcomes and Patient Experience (AYA HOPE study, a population-based cohort (n=484, age 15-39, diagnosed with cancer 6-14 months prior, in 2007-2009. Unmet service needs were psychosocial, physical, spiritual, and financial services where respondents endorsed that they needed, but did not receive, a listed service. Linear regression models tested associations between any or specific unmet service needs and HRQOL, adjusting for demographic, medical and health insurance variables.Results: Over one-third of respondents reported at least one unmet service need. The most common were financial (16%, mental health (15%, and support group (14% services. Adjusted models showed that having any unmet service need was associated with worse overall HRQOL, fatigue, physical, emotional, social, and school/work functioning, and mental health (p’s<0.0001. Specific unmet services were related to particular outcomes (e.g., needing pain management was associated with worse overall HRQOL, physical and social functioning (p’s<0.001. Needing mental health services had the strongest associations with worse HRQOL outcomes; needing physical/occupational therapy was most consistently associated with poorer functioning across domains.Discussion: Unmet service needs in AYAs recently diagnosed with cancer are associated with worse HRQOL. Research should examine developmentally appropriate, relevant practices to improve access to services demonstrated to adversely impact HRQOL, particularly physical therapy and mental

  17. Quality of Life for Individuals with Hearing Impairment Who Have Not Consulted for Services and Their Significant Others: Same- and Different-Sex Couples

    Science.gov (United States)

    Kelly, Rebecca J.; Atcherson, Samuel R.

    2011-01-01

    The purpose of this exploratory study was to assess perceptions of quality of life for individuals with hearing impairment who have not consulted for services and their significant others who are in same-sex relationships vs. those who are in different-sex relationships. Data were collected on a total of 20 older couples: 10 in same-sex…

  18. Promoting physical activity and quality of life in Vitoria, Brazil: evaluation of the Exercise Orientation Service (EOS) program.

    Science.gov (United States)

    Reis, Rodrigo S; Hino, Adriano Akira F; Cruz, Danielle K; da Silva Filho, Lourival Espiridião; Malta, Deborah C; Domingues, Marlos R; Hallal, Pedro C

    2014-01-01

    The purpose of this study was to evaluate associations between exposure to the Exercise Orientation Service (EOS) program and physical activity (PA) and quality of life (QoL) in adults from Vitoria, Brazil. A phone survey was conducted with 2023 randomly selected participants (≥ 18 years) to measure awareness about the program, participation in the program, PA levels, and QoL. The associations were tested using Poisson and Linear regression models. 31.5% reported awareness about the program, 1.5% reported current participation, and 5.8% reported previous participation. Participation was higher among women (2.1%), older subjects (2.8%), and those reporting morbidities (2.4%). Awareness was higher among middle-aged persons (36.0%) and highly educated participants (37.1%). Current participation (PR = 2.22; 95% CI = 1.65-2.99) and awareness (PR = 1.15; 95% CI = 1.02-1.30) were associated with leisure-time PA (LTPA). Exposure to the program was not associated with QoL but was consistently associated with sufficient levels of LTPA among adults from Vitoria, Brazil.

  19. Leprosy: ancient disease remains a public health problem nowadays.

    Science.gov (United States)

    Noriega, Leandro Fonseca; Chiacchio, Nilton Di; Noriega, Angélica Fonseca; Pereira, Gilmayara Alves Abreu Maciel; Vieira, Marina Lino

    2016-01-01

    Despite being an ancient disease, leprosy remains a public health problem in several countries -particularly in India, Brazil and Indonesia. The current operational guidelines emphasize the evaluation of disability from the time of diagnosis and stipulate as fundamental principles for disease control: early detection and proper treatment. Continued efforts are needed to establish and improve quality leprosy services. A qualified primary care network that is integrated into specialized service and the development of educational activities are part of the arsenal in the fight against the disease, considered neglected and stigmatizing.

  20. Life Cycle Thinking and Integrated Product Deliveries in renovation projects: Extending the concept of Integrated Product Deliveries with Product Service Systems

    DEFF Research Database (Denmark)

    Schipull Kauschen, Jan

    2012-01-01

    on renovation projects from Denmark, using different forms of IPDs for façade renovation and discusses the different stakeholder’s perspectives on life cycle thinking and their interests and values regarding sustainable building. Furthermore is the concept of Product Service Systems (PSS) as a valuable...... IPDs with regard to longevity and adaptability. CONCLUSION The new type of service-focused IPD and the related life-cycle responsibility (development, building phase, maintenance and dismantling/adaption/recycling) creates incentive to integrate life cycle thinking into the development process of IPDs......, resulting in more sustainable building solutions with a greater extend of positive environmental, economical and social impacts. The research presented will also show the importance of adaption and configuration of these complex building components by architects and planners, as they will have a great...

  1. Fish remains and humankind: part two

    Directory of Open Access Journals (Sweden)

    Andrew K G Jones

    1998-07-01

    Full Text Available The significance of aquatic resources to past human groups is not adequately reflected in the published literature - a deficiency which is gradually being acknowledged by the archaeological community world-wide. The publication of the following three papers goes some way to redress this problem. Originally presented at an International Council of Archaeozoology (ICAZ Fish Remains Working Group meeting in York, U.K. in 1987, these papers offer clear evidence of the range of interest in ancient fish remains across the world. Further papers from the York meeting were published in Internet Archaeology 3 in 1997.

  2. Juveniles' Motivations for Remaining in Prostitution

    Science.gov (United States)

    Hwang, Shu-Ling; Bedford, Olwen

    2004-01-01

    Qualitative data from in-depth interviews were collected in 1990-1991, 1992, and 2000 with 49 prostituted juveniles remanded to two rehabilitation centers in Taiwan. These data are analyzed to explore Taiwanese prostituted juveniles' feelings about themselves and their work, their motivations for remaining in prostitution, and their difficulties…

  3. Kadav Moun PSA (:60) (Human Remains)

    Centers for Disease Control (CDC) Podcasts

    2010-02-18

    This is an important public health announcement about safety precautions for those handling human remains. Language: Haitian Creole.  Created: 2/18/2010 by Centers for Disease Control and Prevention (CDC).   Date Released: 2/18/2010.

  4. The Annuity Puzzle Remains a Puzzle

    NARCIS (Netherlands)

    Peijnenburg, J.M.J.; Werker, Bas; Nijman, Theo

    We examine incomplete annuity menus and background risk as possible drivers of divergence from full annuitization. Contrary to what is often suggested in the literature, we find that full annuitization remains optimal if saving is possible after retirement. This holds irrespective of whether real or

  5. 75 FR 5108 - Notice of Inventory Completion: University of Wyoming, Anthropology Department, Human Remains...

    Science.gov (United States)

    2010-02-01

    ... Wyoming, Anthropology Department, Human Remains Repository, Laramie, WY AGENCY: National Park Service... funerary objects in the possession and control of the University of Wyoming, Anthropology Department, Human... of Wyoming, Anthropology Department, Human Remains Repository professional staff in consultation with...

  6. Ecosystem Services

    Science.gov (United States)

    Ecosystem goods and services are the many life-sustaining benefits we receive from nature and contribute to environmental and human health and well-being. Ecosystem-focused research will develop methods to measure ecosystem goods and services.

  7. Innovating mass-customized service : Application of a service perspective life cycle innovation management (SLIM) model in an ICT-intensive firm in a fast-changing environment

    NARCIS (Netherlands)

    R.O. Reitsma (Rob)

    2011-01-01

    markdownabstractAbstract Mass customization is a business approach aimed at the low-cost production of customized goods and services. It relies on ‘horizontalization’, platform thinking and modularity, but how can these concepts be applied in a fast-changing service environment in which both

  8. On capabilities of thermomechanical treatment in increasing durability of short service life elements of mining аnd processing equipment

    Directory of Open Access Journals (Sweden)

    В. И. Болобов

    2016-11-01

    Full Text Available Hadfield steel (110G13L is the basic material for fast wornout items of mining equipment: beaters, hammers, liners, refractory plates of crushers and mills. By way of example, the effect of cold hardening was specifically analyzed on the rate of wear of mining equipment parts for various types of wear by hard (more than 1100 HV and soft rock. A unique ability of that steel to resist shock wear is noted. It is shown that this steel exhibits low resistance to abrasive rock wear. Meanwhile wear by rock of hardness lower than steel (less than 1100 HV, may be substantially increased by pre-hardening of samples (up to 10-fold. In case of wear by high hardness rocks, shock impact that should contribute to hardening of the material, fails  to increase abrasive wear resistance of Hadfield steel, and in that parameter it does not differ from the conventional medium carbon steel 45. Also, the authors of this article describe a technique they developed of high-temperature thermomechanical treatment of specimen of Hadfield steel (free forging at 1150-950ºC and subsequent quenching in water and experiments in their abrasion. The results of tests show that hardness and wear resistance of Hadfield steel to hard abrasive (corundum 25A with aggregate hardness of ~2500 HV increases with plastic deformation at HTMT. For maximum plastic deformation intensity (deformation magnitude of α = 2.25, reached in the experiments by the authors, wear resistance grew by 70% as compared to undeformed steel. The dependence is presented of wear resistance of steel on hardness, HV, achieved in the result of plastic deformation. Since a similar positive effect was obtained earlier by the authors for 35HGSA steel, also used in mining machinery, they conclude that the HTMT technique may be recommended for treating short lived parts of the mining and mineral processing equipment to increase their service life.

  9. Visual impairment, coping strategies and impact on daily life: a qualitative study among working-age UK ex-service personnel.

    Science.gov (United States)

    Stevelink, Sharon A M; Malcolm, Estelle M; Fear, Nicola T

    2015-11-12

    Sustaining a visual impairment may have a substantial impact on various life domains such as work, interpersonal relations, mobility and social and mental well-being. How to adjust to the loss of vision and its consequences might be a challenge for the visually impaired person. The purpose of the current study was to explore how younger male ex-Service personnel cope with becoming visually impaired and how this affects their daily life. Semi-structured interviews with 30 visually impaired male ex-Service personnel, all under the age of 55, were conducted. All participants are members of the charity organisation Blind Veterans UK. Interviews were analysed thematically. Younger ex-Service personnel applied a number of different strategies to overcome their loss of vision and its associated consequences. Coping strategies varied from learning new skills, goal setting, integrating the use of low vision aids in their daily routine, to social withdrawal and substance misuse. Vision loss affected on all aspects of daily life and ex-Service personnel experienced an on-going struggle to accept and adjust to becoming visually impaired. Health care professionals, family and friends of the person with the visual impairment need to be aware that coping with a visual impairment is a continuous struggle; even after a considerable amount of time has passed, needs for emotional, social, practical and physical support may still be present.

  10. What works in 'real life' to facilitate home deaths and fewer hospital admissions for those at end of life?: results from a realist evaluation of new palliative care services in two English counties.

    Science.gov (United States)

    Wye, Lesley; Lasseter, Gemma; Percival, John; Duncan, Lorna; Simmonds, Bethany; Purdy, Sarah

    2014-01-01

    WE EVALUATED END OF LIFE CARE SERVICES IN TWO ENGLISH COUNTIES INCLUDING: coordination centres, telephone advice line, 'Discharge in Reach' nurses, a specialist community personal care team and community nurse educators. Elsewhere, we published findings detailing high family carer satisfaction and fewer hospital admissions, Accident and Emergency attendances and hospital deaths for service users compared to controls. The aim of this paper is to discuss what contributed to those outcomes. Using realist evaluation, data collection included documentation (e.g. referral databases), 15 observations of services and interviews with 43 family carers and 105 professionals. Data were analysed using framework analysis, applying realist evaluation concepts. Findings were discussed at successive team meetings and further data was collected until team consensus was reached. Services 'worked' primarily for those with cancer with 'fast track' funding who were close to death. Factors contributing to success included services staffed with experienced palliative care professionals with dedicated (and sufficient) time for difficult conversations with family carers, patients and/or clinical colleagues about death and the practicalities of caring for the dying. Using their formal and informal knowledge of the local healthcare system, they accessed community resources to support homecare and delivered excellent services. This engendered confidence and reassurance for staff, family carers and patients, possibly contributing to less hospital admissions and A&E attendances and more home deaths. With demand for 24-hour end of life care growing and care provision fragmented across health and social care boundaries, services like these that cut across organisational sectors may become more important. They offer an overview to help navigate those desiring a home death through the system.

  11. Life Cycle Thinking and Integrated Product Deliveries in renovation projects: Extending the concept of Integrated Product Deliveries with Product Service Systems

    DEFF Research Database (Denmark)

    Schipull Kauschen, Jan

    2012-01-01

    extension to the concept of IPDs discussed. Due to extended product responsibility, the concept of PSSs will offer new possibilities of planning and pre-defining life cycles of IPDs more precisely than for regular building components. Reducing or eliminating point-of-sales will induce producers to optimize...... on renovation projects from Denmark, using different forms of IPDs for façade renovation and discusses the different stakeholder’s perspectives on life cycle thinking and their interests and values regarding sustainable building. Furthermore is the concept of Product Service Systems (PSS) as a valuable...

  12. Stroke survivors’ levels of community reintegration, quality of life, satisfaction with the physiotherapy services and the level of caregiver strain at community health centres within the Johannesburg area

    Directory of Open Access Journals (Sweden)

    Adrian Kusambiza-Kiingi

    2017-03-01

    Full Text Available Background: Stroke survivors are discharged home before they are functionally independent and return home with activity limitations that would not be manageable without a caregiver. Aim: To determine stroke survivors’ levels of community reintegration, quality of life (QOL, satisfaction with the physiotherapy services and the level of caregiver strain at community health centres within the Johannesburg area. Method: This was a cross-sectional study using the following outcome measures: Maleka Stroke Community Reintegration Measure, Stroke-specific quality of life scale, Caregiver strain index and Physical therapy patient satisfaction questionnaire. Results: A total of 108 stroke survivors and 45 caregivers participated in this study. The average age of the stroke survivors was 54 years (standard deviation = 12.73 and 58% (n = 62 had moderate to full community reintegration. They were happy with physiotherapy services but not with parking availability and cost of services. The QOL was poor with the lowest scores for energy and highest scores for vision and language domains. Twenty five (55% caregivers were strained. A positive correlation was found between community reintegration and satisfaction with services (r = 0.27, p < 0.0001 and QOL (r = 0.51, p < 0.0001. A negative correlation was found between community reintegration and caregiver strain (r = -0.37, p < 0.0001. Conclusion: Most stroke survivors are reintegrated into their communities except in the areas of work and education and have poor QOL and most of their caregivers are strained; however, they are satisfied with physiotherapy services.

  13. The effect of a home delivery meal service of energy- and protein-rich meals on quality of life in malnourished outpatients suffering from lung cancer

    DEFF Research Database (Denmark)

    Leedo, Eva; Gade, Josephine; Granov, Sabrina

    2017-01-01

    Undernutrition is prevalent in cancer patients and associated with increased incidence of complications and mortality. We investigated the effects of a home delivery meal service, providing a selection of energy-dense, protein-rich meals, on quality of life (QoL) in malnourished lung cancer....... Intervention exerted a significant positive effect on performance score after 12 wk (P = 0.047). Increased energy and protein intakes were strongly associated with improved QoL, functional score, hand grip strength, symptom and performance scores. Food delivery service with energy- and protein-rich main meals...

  14. Industry remains stuck in a transitional mode

    International Nuclear Information System (INIS)

    Garb, F.A.

    1991-01-01

    The near future for industry remains foggy for several obvious reasons. The shake-up of the Soviet Union and how the pieces will reform remains unclear. How successful efforts are to privatize government oil company operations around the world has yet to be determined. A long sought peace in the Middle East seems to be inching closer, but will this continue? If it does continue, what impact will it have on world energy policy? Will American companies, which are now transferring their attention to foreign E and P, also maintain an interest in domestic activities? Is the U.S. economy really on the upswing? We are told that the worst of the recession is over, but try telling this to thousands of workers in the oil patch who are being released monthly by the big players in domestic operations. This paper reports that 1992 should be a better year than 1991, if measured in opportunity. There are more exploration and acquisition options available, both domestically and internationally, than there have been in years. Probably more opportunities exist than there are players-certainly more than can be funded with current financial resources

  15. Optimum hospice at home services for end-of-life care: protocol of a mixed-methods study employing realist evaluation.

    Science.gov (United States)

    Butler, Claire; Brigden, Charlotte; Gage, Heather; Williams, Peter; Holdsworth, Laura; Greene, Kay; Wee, Bee; Barclay, Stephen; Wilson, Patricia

    2018-05-16

    Hospice at home (HAH) services aim to enable patients to be cared for and die in their place of choice, if that is at home, and to achieve a 'good death'. There is a considerable range of HAH services operating in England. The published evidence focuses on evaluations of individual services which vary considerably, and there is a lack of consistency in terms of the outcome measures reported. The evidence, therefore, does not provide generalisable information, so the question 'What are the features of hospice at home service models that work, for whom, and under what circumstances?' remains unanswered. The study aims to answer this question. This is a mixed-methods study in three phases informed by realist evaluation methodology. All HAH services in England will be invited to participate in a telephone survey to enable the development of a typology of services. In the second phase, case study sites representing the different service types will collect patient data and recruit carers, service managers and commissioners to gather quantitative and qualitative data about service provision and outcomes. A third phase will synthesise and refine the results through consensus workshops. The first survey phase has university ethics approval and the second phase, Integrated Research Application System (IRAS) and Health Research Authority (HRA) approval (IRAS ID:205986, REC:17/LO/0880); the third phase does not require ethics approval. Dissemination will be facilitated by project coapplicants with established connections to national policy-making forums, in addition to publications, conference presentations and reports targeted to service providers and commissioners. © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

  16. Fate of nuclear waste site remains unclear

    International Nuclear Information System (INIS)

    Anderson, E.V.

    1980-01-01

    The only commercial nuclear fuel reprocessing plant in the U.S., located in West Valley, N.Y., has been shut down since 1972, and no efforts have yet been made to clean up the site. The site contains a spent-fuel pool, high level liquid waste storage tanks, and two radioactive waste burial grounds. Nuclear Fuel Services, Inc., has been leasing the site from the New York State Energy RandD Authority. Federal litigation may ensue, prompted by NRC and DOE, if the company refuses to decontaminate the area when its lease expires at the end of 1980. DOE has developed a plan to solidify the liquid wastes at the facility but needs additional legislation and funding to implement the scheme

  17. Shotgun microbial profiling of fossil remains

    DEFF Research Database (Denmark)

    Der Sarkissian, Clio; Ermini, Luca; Jónsson, Hákon

    2014-01-01

    the specimen of interest, but instead reflect environmental organisms that colonized the specimen after death. Here, we characterize the microbial diversity recovered from seven c. 200- to 13 000-year-old horse bones collected from northern Siberia. We use a robust, taxonomy-based assignment approach...... to identify the microorganisms present in ancient DNA extracts and quantify their relative abundance. Our results suggest that molecular preservation niches exist within ancient samples that can potentially be used to characterize the environments from which the remains are recovered. In addition, microbial...... community profiling of the seven specimens revealed site-specific environmental signatures. These microbial communities appear to comprise mainly organisms that colonized the fossils recently. Our approach significantly extends the amount of useful data that can be recovered from ancient specimens using...

  18. Some remaining problems in HCDA analysis

    International Nuclear Information System (INIS)

    Chang, Y.W.

    1981-01-01

    The safety assessment and licensing of liquid-metal fast breeder reactors (LMFBRs) requires an analysis on the capability of the reactor primary system to sustain the consequences of a hypothetical core-disruptive accident (HCDA). Although computational methods and computer programs developed for HCDA analyses can predict reasonably well the response of the primary containment system, and follow up the phenomena of HCDA from the start of excursion to the time of dynamic equilibrium in the system, there remain areas in the HCDA analysis that merit further analytical and experimental studies. These are the analysis of fluid impact on reactor cover, three-dimensional analysis, the treatment of the perforated plates, material properties under high strain rates and under high temperatures, the treatment of multifield flows, and the treatment of prestressed concrete reactor vessels. The purpose of this paper is to discuss the structural mechanics of HCDA analysis in these areas where improvements are needed

  19. Political, energy events will remain interwoven

    International Nuclear Information System (INIS)

    Jones, D.P.

    1991-01-01

    This paper reports that it is possible to discuss the significance of political and energy events separately, but, in truth, they are intricately interwoven. Furthermore, there are those who will argue that since the two are inseparable, the future is not predictable; so why bother in the endeavor. It is possible that the central point of the exercise may have been missed-yes, the future is unpredictable exclamation point However, the objective of prediction is secondary. The objective of understanding the dynamic forces of change is primary exclamation point With this view of recent history, it is perhaps appropriate to pause and think about the future of the petroleum industry. The future as shaped by political, energy, economic, environmental and technological forces will direct our lives and markets during this decade. Most importantly, what will be the direction that successful businesses take to remain competitive in a global environment? These are interesting issues worthy of provocative thoughts and innovative ideas

  20. Nuclear remains an economic and ecologic asset

    International Nuclear Information System (INIS)

    Le Ngoc, Boris

    2015-01-01

    The author herein outlines the several benefits of nuclear energy and nuclear industry for France. He first outlines that France possesses 97 per cent of de-carbonated electricity thanks to nuclear energy (77 pc) and renewable energies (20 pc, mainly hydraulic), and that renewable energies must be developed in the building and transport sectors to be able to get rid of the environmentally and financially costly fossil energies. He outlines that reactor maintenance and the nuclear fuel cycle industry are fields of technological leadership for the French nuclear industry which is, after motor industry and aircraft industry, the third industrial sector in France. He indicates that nuclear electricity is to remain the most competitive one, and that nuclear energy and renewable energies must not be opposed to it but considered as complementary in the struggle against climate change, i.e. to reduce greenhouse gas emissions and to get rid of the prevalence of fossil energies

  1. Does hypertension remain after kidney transplantation?

    Directory of Open Access Journals (Sweden)

    Gholamreza Pourmand

    2015-05-01

    Full Text Available Hypertension is a common complication of kidney transplantation with the prevalence of 80%. Studies in adults have shown a high prevalence of hypertension (HTN in the first three months of transplantation while this rate is reduced to 50- 60% at the end of the first year. HTN remains as a major risk factor for cardiovascular diseases, lower graft survival rates and poor function of transplanted kidney in adults and children. In this retrospective study, medical records of 400 kidney transplantation patients of Sina Hospital were evaluated. Patients were followed monthly for the 1st year, every two months in the 2nd year and every three months after that. In this study 244 (61% patients were male. Mean ± SD age of recipients was 39.3 ± 13.8 years. In most patients (40.8% the cause of end-stage renal disease (ESRD was unknown followed by HTN (26.3%. A total of 166 (41.5% patients had been hypertensive before transplantation and 234 (58.5% had normal blood pressure. Among these 234 individuals, 94 (40.2% developed post-transplantation HTN. On the other hand, among 166 pre-transplant hypertensive patients, 86 patients (56.8% remained hypertensive after transplantation. Totally 180 (45% patients had post-transplantation HTN and 220 patients (55% didn't develop HTN. Based on the findings, the incidence of post-transplantation hypertension is high, and kidney transplantation does not lead to remission of hypertension. On the other hand, hypertension is one of the main causes of ESRD. Thus, early screening of hypertension can prevent kidney damage and reduce further problems in renal transplant recipients.

  2. Combination of Extracorporeal Life Support and Mesenchymal Stem Cell Therapy for Treatment of ARDS in Combat Casualties and Evacuation of Service Members with ARDS

    Science.gov (United States)

    2017-10-01

    AWARD NUMBER: W81XWH-15-2-0072 TITLE: Combination of Extracorporeal Life Support and Mesenchymal Stem Cell Therapy for Treatment of ARDS in...Mesenchymal Stem Cell Therapy for Treatment of ARDS in Combat Casualties and Evacuation of Service Members with ARDS 5b. GRANT NUMBER W81XWH-15...Figure 4. Mitochondrial activity is mostly preserved on the animals that were supported with ventilator devices and mesenchymal stem cells . Using a

  3. The influence of exercise intervention upon quality of life and activity of daily living in elderly people who use nursing care insurance services

    OpenAIRE

    竹内, 亮

    2012-01-01

    The purpose of this study was to confirm the importance of enhancing quality of life (QOL) and activity of daily living (ADL) in elderly people, and to examine methods of exercise intervention for QOL and ADL outcomes in elderly people who use nursing care insurance services. Chapter 2 clarifies the relationship between QOL, ADL, and changes in the level of independence in elderly residents. Higher QOL outcomes (sense of well-being, satisfaction with social support, independence, and beh...

  4. Should the service life of nuclear power plants be limited for technical reasons?; Mela by byt provozni zivotnost jaderne elektrarny z technickych duvodu omezena?

    Energy Technology Data Exchange (ETDEWEB)

    Schomer, E

    1995-03-01

    German nuclear power plant operating licenses take into account the fact that the design lifetime of the facilities is 40 years. The technological lifetime, however, is governed by actual ageing processes and operational burden. The service life of nuclear power plants can be extended by replacement of the steam generator and by repair or replacement of the reactor pressure vessel or parts thereof. Attention is also paid to the reactor protection systems. (J.B.). 8 figs.

  5. Improving health related quality of life among rural hypertensive patients through the integrative strategy of health services delivery: a quasi-experimental trial from Chongqing, China.

    Science.gov (United States)

    Miao, Yudong; Zhang, Liang; Sparring, Vibeke; Sandeep, Sandeep; Tang, Wenxi; Sun, Xiaowei; Feng, Da; Ye, Ting

    2016-08-23

    Integrative strategy of health services delivery has been proven to be effective in economically developed countries, where the healthcare systems have enough qualified primary care providers. However rural China lacks such providers to act as gatekeeper, besides, Chinese rural hypertensive patients are usually of old age, more likely to be exposed to health risk factors and they experience a greater socio-economic burden. All these Chinese rural setting specific features make the effectiveness of integrative strategy of health services in improving health related quality of life among Chinese rural hypertensive patients uncertain. In order to assess the impact of integrative strategy of health services delivery on health related quality of life among Chinese rural hypertensive patients, a two-year quasi-experimental trial was conducted in Chongqing, China. At baseline the sample enrolled 1006 hypertensive patients into intervention group and 420 hypertensive patients into control group. Physicians from village clinics, town hospitals and county hospitals worked collaboratively to deliver multidisciplinary health services for the intervention group, while physicians in the control group provided services without cooperation. The quality of life was studied by SF-36 Scale. Blood pressures were reported by town hospitals. The Difference-in-Differences model was used to estimate the differences in SF-36 score and blood pressure of both groups to assess the impact. The study showed that at baseline there was no statistical difference in SF-36 scores between both groups. While at follow-up the intervention group scored higher in overall SF-36, Role Physical, Body Pain, Social Functioning and Role Emotional than the control group. The Difference-in-Differences result demonstrated that there were statistical differences in SF-36 total score (p = 0.011), Role Physical (p = 0.027), Social Functioning (p = 0.000), Role Emotional (p = 0.002) between both

  6. Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study

    Directory of Open Access Journals (Sweden)

    Ki-Bong Park

    2017-01-01

    Full Text Available The increase in CO2 concentrations and global warming will increase the carbonation depth of concrete. Furthermore, temperature rise will increase the rate of corrosion of steel rebar after carbonation. On the other hand, compared with normal concrete, high volume fly ash (HVFA concrete is more vulnerable to carbonation-induced corrosion. Carbonation durability design with climate change is crucial to the rational use of HVFA concrete. This study presents a probabilistic approach that predicts the service life of HVFA concrete structures subjected to carbonation-induced corrosion resulting from increasing CO2 concentrations and temperatures. First, in the corrosion initiation stage, a hydration-carbonation integration model is used to evaluate the contents of the carbonatable material, porosity, and carbonation depth of HVFA concrete. The Monte Carlo method is adopted to determine the probability of corrosion initiation. Second, in the corrosion propagation stage, an updated model is proposed to evaluate the rate of corrosion, degree of corrosion for cover cracking of concrete, and probability of corrosion cracking. Third, the whole service life is determined considering both corrosion initiation stage and corrosion propagation stage. The analysis results show that climate change creates a significant impact on the service life of durable concrete.

  7. Incorporating individualized quality of life measures in the evaluation of pharmacy services: the IN*COMPASS framework.

    Science.gov (United States)

    Funderburk, F R; Pathak, D S; Pleil, A M

    1998-01-01

    Quality of life is a fascinating field to researchers and practitioners alike. To some researchers, quality of life is of interest because it offers untold challenges in constructing instruments and capturing data necessary to answer key questions about health, disease, and treatment. For such researchers, quality of life is about statistical relationships among questions and about using questions to define the physical, social, and emotional domains of health. To other researchers, this field is about finding practical applications in policy and treatment decision making for the information provided by quality of life assessments. To these researchers, the focus of quality of life is on ways to apply knowledge of quality of life differences between groups with and without specific diseases or ways to use knowledge about how treatments affect the quality of life of various patient populations. To practitioners, quality of life is about treatment outcomes that impact individual patients' daily lives. It is the practitioner that Funderburk, Pleil, and Pathak are considering in their paper in this issue of Pharmacy Practice Management Quarterly. These authors give several important messages to practitioners seeking to serve their patients by incorporating quality of life into their practices. The key message in the paper is that to better understand and determine the impact of treatment on a patient's quality of life, it is critical to start with a baseline or reference point relevant to that patient. From that baseline or reference point, treatment decisions can be made and progress, in quality of life terms, can be evaluated. Critical questions in their framework, which is called the IN*COMPASS (Individualized Client Oriented Method for Preferred Alleviation of Sickness States) Approach, are "How are you now?" and "How would you like to be?" The authors do not endorse particular quality of life tools in their approach; rather they prescribe certain critical

  8. Reliability-based service life assessment of concrete structures in nuclear power plants: optimum inspection and repair

    International Nuclear Information System (INIS)

    Ellingwood, B.R.; Mori, Y.

    1995-01-01

    Research is being conducted to address aging management of safety-related reinforced concrete structures in nuclear power plants (NPPs). Documentation is being prepared to identify potential structural safety issues and to recommend criteria for use in evaluating reinforced concrete structures for continued service. Time-dependent reliability analysis provides the framework and quantitative tools for the condition assessment. The role of in-service inspection and repair in ensuring continued reliability in-service is examined. (author). 19 refs., 4 figs

  9. Self-Stigma and Quality of Life among People with Mental Illness Who Receive Compulsory Community Treatment Services

    Science.gov (United States)

    Livingston, James

    2012-01-01

    The present study was designed to examine the relationship between self-stigma and quality of life over a one year time period for 71 people with mental illness who were receiving compulsory community mental health treatment. It was hypothesized that, over time, self-stigma would have the direct effect of eroding quality of life among people with…

  10. Comparison of Mental Health and Quality of Life between Shift and Non-shift Employees of Service Industries

    Directory of Open Access Journals (Sweden)

    Nahal Salimi

    2016-12-01

    Full Text Available This study examined the relationship between the employment practices and employees' mental health and quality of life in Iran. In particular, the study compared the mental health and quality of life of shift and non-shift workers in sensitive employment settings. Using a cross-sectional survey design, 120 individuals employed in two airline companies as either shift or non-shift employees completed the survey for the study. Data was collected using General Health Question (GHQ28 for mental health, the Short Form (36 Health Survey (SF-36 for Quality of Life and a demographic questionnaire. Multivariate analysis of variance (MANOVA was used to analyze the collected data. The results showed that (1 type of work (shift or non-shift has an effect on mental health and quality of life; and (2 there are significant differences in dimensions of quality of life and mental health between shift and non-shift staff.

  11. The Human Remains from HMS Pandora

    Directory of Open Access Journals (Sweden)

    D.P. Steptoe

    2002-04-01

    Full Text Available In 1977 the wreck of HMS Pandora (the ship that was sent to re-capture the Bounty mutineers was discovered off the north coast of Queensland. Since 1983, the Queensland Museum Maritime Archaeology section has carried out systematic excavation of the wreck. During the years 1986 and 1995-1998, more than 200 human bone and bone fragments were recovered. Osteological investigation revealed that this material represented three males. Their ages were estimated at approximately 17 +/-2 years, 22 +/-3 years and 28 +/-4 years, with statures of 168 +/-4cm, 167 +/-4cm, and 166cm +/-3cm respectively. All three individuals were probably Caucasian, although precise determination of ethnicity was not possible. In addition to poor dental hygiene, signs of chronic diseases suggestive of rickets and syphilis were observed. Evidence of spina bifida was seen on one of the skeletons, as were other skeletal anomalies. Various taphonomic processes affecting the remains were also observed and described. Compact bone was observed under the scanning electron microscope and found to be structurally coherent. Profiles of the three skeletons were compared with historical information about the 35 men lost with the ship, but no precise identification could be made. The investigation did not reveal the cause of death. Further research, such as DNA analysis, is being carried out at the time of publication.

  12. SMART POINT CLOUD: DEFINITION AND REMAINING CHALLENGES

    Directory of Open Access Journals (Sweden)

    F. Poux

    2016-10-01

    Full Text Available Dealing with coloured point cloud acquired from terrestrial laser scanner, this paper identifies remaining challenges for a new data structure: the smart point cloud. This concept arises with the statement that massive and discretized spatial information from active remote sensing technology is often underused due to data mining limitations. The generalisation of point cloud data associated with the heterogeneity and temporality of such datasets is the main issue regarding structure, segmentation, classification, and interaction for an immediate understanding. We propose to use both point cloud properties and human knowledge through machine learning to rapidly extract pertinent information, using user-centered information (smart data rather than raw data. A review of feature detection, machine learning frameworks and database systems indexed both for mining queries and data visualisation is studied. Based on existing approaches, we propose a new 3-block flexible framework around device expertise, analytic expertise and domain base reflexion. This contribution serves as the first step for the realisation of a comprehensive smart point cloud data structure.

  13. Effect of a home-based end-of-life nursing service on hospital use at the end of life and place of death: a study using administrative data and matched controls.

    Science.gov (United States)

    Chitnis, X A; Georghiou, T; Steventon, A; Bardsley, M J

    2013-12-01

    To assess the effect of routinely delivered home-based end-of-life care on hospital use at the end of life and place of death. Retrospective analysis using matched controls and administrative data. Community-based care in England. 29,538 people aged over 18 who received Marie Curie nursing support compared with 29,538 controls individually matched on variables including: age, socioeconomic deprivation, prior hospital use, number of chronic conditions and prior diagnostic history. Home-based end-of-life nursing care delivered by the Marie Curie Nursing Service (MCNS), compared with end-of-life care available to those who did not receive MCNS care. Proportion of people who died at home; numbers of emergency and elective inpatient admissions, outpatient attendances and attendances at emergency departments in the period until death; and notional costs of hospital care. Intervention patients were significantly more likely to die at home and less likely to die in hospital than matched controls (unadjusted OR 6.16, 95% CI 5.94 to 6.38, pnursing for longer. Home-based end-of-life care offers the potential to reduce demand for acute hospital care and increase the number of people able to die at home.

  14. The contribution of an asthma diagnostic consultation service in obtaining an accurate asthma diagnosis for primary care patients: results of a real-life study.

    Science.gov (United States)

    Gillis, R M E; van Litsenburg, W; van Balkom, R H; Muris, J W; Smeenk, F W

    2017-05-19

    Previous studies showed that general practitioners have problems in diagnosing asthma accurately, resulting in both under and overdiagnosis. To support general practitioners in their diagnostic process, an asthma diagnostic consultation service was set up. We evaluated the performance of this asthma diagnostic consultation service by analysing the (dis)concordance between the general practitioners working hypotheses and the asthma diagnostic consultation service diagnoses and possible consequences this had on the patients' pharmacotherapy. In total 659 patients were included in this study. At this service the patients' medical history was taken and a physical examination and a histamine challenge test were carried out. We compared the general practitioners working hypotheses with the asthma diagnostic consultation service diagnoses and the change in medication that was incurred. In 52% (n = 340) an asthma diagnosis was excluded. The diagnosis was confirmed in 42% (n = 275). Furthermore, chronic rhinitis was diagnosed in 40% (n = 261) of the patients whereas this was noted in 25% (n = 163) by their general practitioner. The adjusted diagnosis resulted in a change of medication for more than half of all patients. In 10% (n = 63) medication was started because of a new asthma diagnosis. The 'one-stop-shop' principle was met with 53% of patients and 91% (n = 599) were referred back to their general practitioner, mostly within 6 months. Only 6% (n = 41) remained under control of the asthma diagnostic consultation service because of severe unstable asthma. In conclusion, the asthma diagnostic consultation service helped general practitioners significantly in setting accurate diagnoses for their patients with an asthma hypothesis. This may contribute to diminish the problem of over and underdiagnosis and may result in more appropriate treatment regimens. SERVICE HELPS GENERAL PRACTITIONERS MAKE ACCURATE DIAGNOSES: A consultation service can

  15. What remains of the Arrow oil?

    International Nuclear Information System (INIS)

    Sergy, G.; Owens, E.

    1993-01-01

    In February 1970, the tanker Arrow became grounded 6.5 km off the north shore of Chedabucto Bay, Nova Scotia, and nearly 72,000 bbl of Bunker C fuel oil were released from the vessel during its subsequent breakup and sinking. The oil was washed ashore in various degrees over an estimated 305 km of the bay's 604-km shoreline, of which only 48 km were cleaned. In addition, the tanker Kurdistan broke in two in pack ice in March 1979 in the Cabot Strait area, spilling ca 54,000 bbl of Bunker C, some of which was later found at 16 locations along the northeast and east shorelines of Chedabucto Bay. In summer 1992, a systematic ground survey of the bay's shorelines was conducted using Environment Canada Shoreline Cleanup Assessment Team (SCAT) procedures. Standard observations were made of oil distribution and width, thickness, and character of the oil residues in 419 coastal segments. Results from the survey are summarized. Oil was found to be present on 13.3 km of the shoreline, with heavy oiling restricted to 1.3 km primarily in the areas of Black Duck Cove and Lennox Passage. Some of this residual oil was identified as coming from the Arrow. Natural weathering processes account for removal of most of the spilled oil from the bay. Oil remaining on the shore was found in areas outside of the zone of physical wave action, in areas of nearshore mixing where fine sediments are not present to weather the oil through biophysical processes, or in crusts formed by oil weathered on the surface. The systematic description of oiled shorelines using the SCAT methodology proved very successful, even for such an old spill. 6 refs

  16. Ghost Remains After Black Hole Eruption

    Science.gov (United States)

    2009-05-01

    NASA's Chandra X-ray Observatory has found a cosmic "ghost" lurking around a distant supermassive black hole. This is the first detection of such a high-energy apparition, and scientists think it is evidence of a huge eruption produced by the black hole. This discovery presents astronomers with a valuable opportunity to observe phenomena that occurred when the Universe was very young. The X-ray ghost, so-called because a diffuse X-ray source has remained after other radiation from the outburst has died away, is in the Chandra Deep Field-North, one of the deepest X-ray images ever taken. The source, a.k.a. HDF 130, is over 10 billion light years away and existed at a time 3 billion years after the Big Bang, when galaxies and black holes were forming at a high rate. "We'd seen this fuzzy object a few years ago, but didn't realize until now that we were seeing a ghost", said Andy Fabian of the Cambridge University in the United Kingdom. "It's not out there to haunt us, rather it's telling us something - in this case what was happening in this galaxy billions of year ago." Fabian and colleagues think the X-ray glow from HDF 130 is evidence for a powerful outburst from its central black hole in the form of jets of energetic particles traveling at almost the speed of light. When the eruption was ongoing, it produced prodigious amounts of radio and X-radiation, but after several million years, the radio signal faded from view as the electrons radiated away their energy. HDF 130 Chandra X-ray Image of HDF 130 However, less energetic electrons can still produce X-rays by interacting with the pervasive sea of photons remaining from the Big Bang - the cosmic background radiation. Collisions between these electrons and the background photons can impart enough energy to the photons to boost them into the X-ray energy band. This process produces an extended X-ray source that lasts for another 30 million years or so. "This ghost tells us about the black hole's eruption long after

  17. Development and evaluation of SOA-based AAL services in real-life environments: a case study and lessons learned.

    Science.gov (United States)

    Stav, Erlend; Walderhaug, Ståle; Mikalsen, Marius; Hanke, Sten; Benc, Ivan

    2013-11-01

    The proper use of ICT services can support seniors in living independently longer. While such services are starting to emerge, current proprietary solutions are often expensive, covering only isolated parts of seniors' needs, and lack support for sharing information between services and between users. For developers, the challenge is that it is complex and time consuming to develop high quality, interoperable services, and new techniques are needed to simplify the development and reduce the development costs. This paper provides the complete view of the experiences gained in the MPOWER project with respect to using model-driven development (MDD) techniques for Service Oriented Architecture (SOA) system development in the Ambient Assisted Living (AAL) domain. To address this challenge, the approach of the European research project MPOWER (2006-2009) was to investigate and record the user needs, define a set of reusable software services based on these needs, and then implement pilot systems using these services. Further, a model-driven toolchain covering key development phases was developed to support software developers through this process. Evaluations were conducted both on the technical artefacts (methodology and tools), and on end user experience from using the pilot systems in trial sites. The outcome of the work on the user needs is a knowledge base recorded as a Unified Modeling Language (UML) model. This comprehensive model describes actors, use cases, and features derived from these. The model further includes the design of a set of software services, including full trace information back to the features and use cases motivating their design. Based on the model, the services were implemented for use in Service Oriented Architecture (SOA) systems, and are publicly available as open source software. The services were successfully used in the realization of two pilot applications. There is therefore a direct and traceable link from the user needs of the

  18. Decentralized Local Services for Improvement of Quality of Life in the Republic of Macedonia, Case Study Tetovo Municipality

    Directory of Open Access Journals (Sweden)

    Memet Memeti

    2012-05-01

    Full Text Available The process of decentralization in Macedonia began in July 2005, after the adaption of theconstitutional amendments made which triggered the process of the decentralization in the Republic ofMacedonia. Having in mind that the decentralization implied structural changes in the Macedonian politicalsystem and in relations between the central and the local government, the implementation of the process ofthe decentralization was designed with a phased approach in order to accommodate the local governmentinstitutions with the new competencies. Among others the process of decentralization had an objective tobring the local authorities closer to the citizens through provision of quality local services. In addition it aimsto provide an opportunity for broader participation and representation of the citizens in their communities.This paper attempts to answer three main questions related to quality public services: - The process ofdecentralization has helped to improve the quality of public services? - What areas of public services undermunicipal jurisdiction are satisfied with it? - How much would you like to be informed about communityactivities? In this paper we are going to analyze the findings from the field research about the quality ofpublic service that provide the municipality of Tetovo of R. Macedonia. The paper focuses on the satisfactionon the public services and provides recommendations for future improvement of the decentralized publicservices in the Republic of Macedonia.

  19. A falls prevention programme to improve quality of life, physical function and falls efficacy in older people receiving home help services: study protocol for a randomised controlled trial.

    Science.gov (United States)

    Bjerk, Maria; Brovold, Therese; Skelton, Dawn A; Bergland, Astrid

    2017-08-14

    Falls and fall-related injuries in older adults are associated with great burdens, both for the individuals, the health care system and the society. Previous research has shown evidence for the efficiency of exercise as falls prevention. An understudied group are older adults receiving home help services, and the effect of a falls prevention programme on health-related quality of life is unclear. The primary aim of this randomised controlled trial is to examine the effect of a falls prevention programme on quality of life, physical function and falls efficacy in older adults receiving home help services. A secondary aim is to explore the mediating factors between falls prevention and health-related quality of life. The study is a single-blinded randomised controlled trial. Participants are older adults, aged 67 or older, receiving home help services, who are able to walk with or without walking aids, who have experienced at least one fall during the last 12 months and who have a Mini Mental State Examination of 23 or above. The intervention group receives a programme, based on the Otago Exercise Programme, lasting 12 weeks including home visits and motivational telephone calls. The control group receives usual care. The primary outcome is health-related quality of life (SF-36). Secondary outcomes are leg strength, balance, walking speed, walking habits, activities of daily living, nutritional status and falls efficacy. All measurements are performed at baseline, following intervention at 3 months and at 6 months' follow-up. Sample size, based on the primary outcome, is set to 150 participants randomised into the two arms, including an estimated 15-20% drop out. Participants are recruited from six municipalities in Norway. This trial will generate new knowledge on the effects of an exercise falls prevention programme among older fallers receiving home help services. This knowledge will be useful for clinicians, for health managers in the primary health care service

  20. Can comprehensive specialised end-of-life care be provided at home? Lessons from a study of an innovative consultant-led community service in the UK.

    Science.gov (United States)

    Noble, B; King, N; Woolmore, A; Hughes, P; Winslow, M; Melvin, J; Brooks, J; Bravington, A; Ingleton, C; Bath, P A

    2015-03-01

    The Midhurst Macmillan Specialist Palliative Care Service (MMSPCS) is a UK, medical consultant-led, multidisciplinary team aiming to provide round-the-clock advice and care, including specialist interventions, in the home, community hospitals and care homes. Of 389 referrals in 2010/11, about 85% were for cancer, from a population of about 155 000. Using a mixed method approach, the evaluation comprised: a retrospective analysis of secondary-care use in the last year of life; financial evaluation of the MMSPCS using an Activity Based Costing approach; qualitative interviews with patients, carers, health and social care staff and MMSPCS staff and volunteers; a postal survey of General Practices; and a postal survey of bereaved caregivers using the MMSPCS. The mean cost is about 3000 GBP (3461 EUR) per patient with mean cost of interventions for cancer patients in the last year of life 1900 GBP (2192 EUR). Post-referral, overall costs to the system are similar for MMSPCS and hospice-led models; however, earlier referral avoided around 20% of total costs in the last year of life. Patients and carers reported positive experiences of support, linked to the flexible way the service worked. Seventy-one per cent of patients died at home. This model may have application elsewhere. © 2014 The Authors. European Journal of Cancer Care published by John Wiley & Sons Ltd.

  1. Methodological aspects to be considered in evaluating the economics of service measures

    International Nuclear Information System (INIS)

    Bald, M.

    1987-01-01

    For the purposes of the report, service measures is used as a term denoting all those steps which exceed the framework of normal in-service maintenance and repair and serve to improve economics over the normal case. Positive impacts are to be achieved on such parameters as availability, efficiency, and service life. One of the aspects investigated is the effect, if any, of such measures on the residual service life of plants in operation for a long period of time already. Residual service life in this case means the remaining span of effective technical and economic operation which, in these model calculations, also includes part of the period of depreciation. (orig.) [de

  2. 'Silent voices' in health services research: ethnicity and socioeconomic variation in participation in studies of quality of life in childhood visual disability.

    Science.gov (United States)

    Tadic, Valerie; Hamblion, Esther Louise; Keeley, Sarah; Cumberland, Phillippa; Lewando Hundt, Gillian; Rahi, Jugnoo Sangeeta

    2010-04-01

    Purpose. To investigate patterns of participation of visually impaired (VI) children and their families in health services research. Methods. The authors compared clinical and sociodemographic characteristics of children and their families who participated with those who did not participate in two studies of quality of life (QoL) of VI children. In Study 1, the authors interviewed VI children and adolescents, aged 10 to 15 years, about their vision-related quality of life (VRQoL) as the first phase of a program to develop a VRQoL instrument for this population. One hundred seven children with visual impairment (visual acuity in the better eye LogMar worse than 0.51) were invited to participate in the interviews. Study 2 investigated health-related quality of life (HRQoL) of VI children using an existing generic instrument, administered in a postal survey. 151 VI children and adolescents, aged 2 to 16 years, with hereditary retinal disorders were invited to participate in the survey. Results. The overall participation level was below 50%. In both studies, participants from white ethnic and more affluent socioeconomic backgrounds were overrepresented. Participation did not vary by age, sex, or clinical characteristics. Conclusions. The authors suggest that there are barriers to participation in child- and family-centered research on childhood visual disability for children from socioeconomically deprived or ethnic minority groups. They urge assessment and reporting of participation patterns in further health services research on childhood visual disability. Failure to recognize that there are "silent voices" is likely to have important implications for equitable and appropriate service planning and provision for VI children.

  3. To be truly alive: motivation among prison inmate hospice volunteers and the transformative process of end-of-life peer care service.

    Science.gov (United States)

    Cloyes, Kristin G; Rosenkranz, Susan J; Wold, Dawn; Berry, Patricia H; Supiano, Katherine P

    2014-11-01

    Some US prisons are meeting the growing need for end-of-life care through inmate volunteer programs, yet knowledge of the motivations of inmate caregivers is underdeveloped. This study explored the motivations of inmate hospice volunteers from across Louisiana State (n = 75) through an open-ended survey, a grounded theory approach to analysis, and comparison of responses by experience level and gender. Participants expressed complex motivations; Inter-related themes on personal growth, social responsibility and ethical service to vulnerable peers suggested that inmate caregivers experience an underlying process of personal and social transformation, from hospice as a source of positive self-identity to peer-caregiving as a foundation for community. Better understanding of inmate caregiver motivations and processes will help prisons devise effective and sustainable end of life peer-care programs. © The Author(s) 2013.

  4. Are satisfaction with and self-management of personal assistance services associated with the life satisfaction of persons with physical disabilities?

    Science.gov (United States)

    Fleming-Castaldy, Rita P

    2011-01-01

    To examine the relationships between satisfaction with and self-management of personal assistance services (PAS) and the quality of life (QoL) of persons with disabilities. To test the postulate that consumer-directed PAS can fulfil the human need for control and contribute to a satisfactory life. A survey compared the perspectives of persons using consumer-directed PAS versus those using agency-directed. A Personal Data Form obtained demographics and PAS characteristics. The Quality of Life Inventory measured life satisfaction. A PAS questionnaire measured perceptions about the management of, desire for control of, and satisfaction with PAS. Data were analysed using SPSS®- 14. Significant relationships were found between QoL and satisfaction with PAS (p perceived control of PAS and satisfaction with PAS (p satisfaction with their PAS (p satisfaction, and QoL support the value of consumer-directed programmes. Rehabilitation professionals can use this knowledge to develop, implement and research practises that enable self-management.

  5. Current HIV/AIDS end-of-life care in sub-Saharan Africa: a survey of models, services, challenges and priorities

    Directory of Open Access Journals (Sweden)

    O'Neill Joseph F

    2003-10-01

    Full Text Available Abstract Background In response to increased global public health funding initiatives to HIV/AIDS care in Africa, this study aimed to describe practice models, strategies and challenges to delivering end-of-life care in sub-Saharan Africa. Methods A survey end-of-life care programs was conducted, addressing the domains of service aims and configuration, barriers to pain control, governmental endorsement and strategies, funding, monitoring and evaluation, and research. Both closed and qualitative responses were sought. Results Despite great structural challenges, data from 48 programs in 14 countries with a mean annual funding of US $374,884 demonstrated integrated care delivery across diverse settings. Care was commonly integrated with all advanced disease care (67% and disease stages (65% offering care from diagnosis. The majority (98% provided home-based care for a mean of 301 patients. Ninety-four percent reported challenges in pain control (including availability, lack of trained providers, stigma and legal restrictions, and 77% addressed the effects of poverty on disease progression and management. Although 85% of programs reported Government endorsement, end-of-life and palliative care National strategies were largely absent. Conclusions The interdependent tasks of expanding pain control, balancing quality and coverage of care, providing technical assistance in monitoring and evaluation, collaborating between donor agencies and governments, and educating policy makers and program directors of end-of-life care are all necessary if resources are to reach their goals.

  6. Equilibrium moisture content of wood at different temperature/moisture conditions in the cladding of wooden constructions and in the relation to their reliability and service life

    OpenAIRE

    Zdeňka Havířová; Pavel Kubů

    2010-01-01

    One of the natural properties of wood and wood-based materials is their soaking capacity (hy­gro­sco­pi­ci­ty). The moisture content of wood and building constructions of wood and wood based materials significantly influences the service life and reliability of these constructions and buildings. The equilibrium weight moisture content of built-in wood corresponding to temperature/moisture conditions inside the cladding has therefore a decisive influence on the basic requirements placed on bui...

  7. The effectiveness of communication-skills training interventions in end-of-life noncancer care in acute hospital-based services: A systematic review.

    Science.gov (United States)

    Lord, Laura; Clark-Carter, David; Grove, Amy

    2016-08-01

    A systematic review was conducted in order to explore the effectiveness of communication-skills training interventions in end-of-life care with noncancer acute-based healthcare staff. Articles were included if they (1) focused on communication-skills training in end-of-life/palliative care for noncancer acute-based staff and (2) reported an outcome related to behavior change with regard to communication. Sixteen online databases were searched, which resulted in 4,038 potential articles. Screening of titles left 393 articles that met the inclusion criteria. Abstracts (n = 346) and full-text articles (n = 47) were reviewed, leaving 10 papers that met the criteria for our review. All articles explored the effect of communication-skills training on aspects of staff behavior; one study measured the effect on self-efficacy, another explored the impact on knowledge and competence, and another measured comfort levels in discussing the end of life with patients/families. Seven studies measured a number of outcomes, including confidence, attitude, preparedness, stress, and communication skills. Few studies have focused on end-of-life communication-skills training in noncancer acute-based services. Those that do have report positive effects on staff behavior with regard to communication about the end of life with patients and families. The studies varied in terms of the population studied and the health services involved, and they scored only moderately or weakly on quality. It is a challenge to draw a definite conclusion about the effectiveness of training interventions in end-of-life communication because of this. However, the findings from our review demonstrate the potential effectiveness of a range of training interventions with healthcare professionals on confidence, attitude, self-efficacy, and communication skills. Further research is needed to fully explore the effectiveness of existing training interventions in this population, and evidence using objective measures

  8. Development of an Accelerated Test Design for Predicting the Service Life of the Solar Array at Mead, Nebraska

    Science.gov (United States)

    Gaines, G. B.; Thomas, R. E.; Noel, G. T.; Shilliday, T. S.; Wood, V. E.; Carmichael, D. C.

    1979-01-01

    An accelerated life test is described which was developed to predict the life of the 25 kW photovoltaic array installed near Mead, Nebraska. A quantitative model for accelerating testing using multiple environmental stresses was used to develop the test design. The model accounts for the effects of thermal stress by a relation of the Arrhenius form. This relation was then corrected for the effects of nonthermal environmental stresses, such as relative humidity, atmospheric pollutants, and ultraviolet radiation. The correction factors for the nonthermal stresses included temperature-dependent exponents to account for the effects of interactions between thermal and nonthermal stresses on the rate of degradation of power output. The test conditions, measurements, and data analyses for the accelerated tests are presented. Constant-temperature, cyclic-temperature, and UV types of tests are specified, incorporating selected levels of relative humidity and chemical contamination and an imposed forward-bias current and static electric field.

  9. A case of industrial safety appraisal for extension of service life of GTK-10-4 gas turbines used at gas transmission stations

    Science.gov (United States)

    Rybnikov, A. I.; Kovalev, A. G.; Kryukov, I. I.; Leont'ev, S. A.; Moshnikov, A. V.

    2017-04-01

    It is shown that the extended life and enhanced operational reliability of parts and subassemblies of the most popular GTK-10-4 gas transmission plants are determined by the enhanced efficiency of the control over technical condition and operational safety of turbine plants in conformity with industrial safety requirements imposed on gas pipeline compressor stations. It has been established that the materials of parts and subassemblies of gas turbine plants with different, especially with maximal operating time, shall be exposed to NDT for the purpose of determining the actual mechanical characteristics of these materials with different operating time and calculating residual life. The analysis of damageability and operating conditions has helped to identify parts and subassemblies for repair or replacement with the highest frequency of unacceptable defects. These parts and subassemblies have been shown to include base members of the axial compressor (AC), a turbine housing, an axial compressor rotor, high- and low-pressure turbine (HPT and LPT) discs, a 12-part holder, the housing of the holder of HPT and LPT guiding blades, a sealed baffler, and working and guiding AC, LPT and HPT blades. The most typical operational defects have been enumerated and analyzed. It has been determined that the primary task of the industrial safety appraisal for extending the life of GTK-10-4 with limit-exceeding operating time is to thoroughly examine HPT and LPT discs with more than 130,000 hours of operating time and establish by DT methods characteristics of materials for evaluation, taking account of their degradation, and residual life of critical turbine elements. In addition, it has been shown that the service life of HP turbine discs can be extended by replacing the disc material (EP-428 12% chromium steel) with a material with a higher linear expansion factor that somewhat exceeds the expansion factor of EI-893 nickel alloy used to melt out working blades.

  10. An analysis of structural relationship among achievement motive on social participation, purpose in life, and role expectations among community dwelling elderly attending day services

    Directory of Open Access Journals (Sweden)

    Nobuyuki Sano

    2016-01-01

    Full Text Available Background. Achievement motive is defined as the intention to achieve one’s goals. Achievement motive is assumed to promote clients to choices and actions toward their valuable goal, so it is an important consideration in rehabilitation. Purpose. The purpose of this study is to demonstrate the structural relationship among achievement motive on purpose in life, social participation, and role expectation of community-dwelling elderly people. Methods. Participants were community-dwelling elderly people in day-service centers. A total of 281 participants (male: 127, female: 154 answered the self-administered questionnaire in cross-sectional research. The questionnaire was comprised of demographic data and scales that evaluated achievement motive, social participation, purpose in life, and role expectation. We studied the structural relationship established by our hypothesized model via a structural equation modeling approach. Results. We checked the standardized path coefficients and the modification indices; the modified model’s statistics were a good fit: CFI = 0.984, TLI = 0.983, RMSEA = 0.050, 90% CI [0.044–0.055]. Achievement motive had a significantly direct effect on purpose in life (direct effect = 0.445, p value < 0.001, a significantly indirect effect on purpose in life via social participation or role expectation (indirect effect = 0.170, p value < 0.001 and a total effect on purpose in life (total effect = 0.615. Discussion. This result suggests that enhancing the intention to achieve one’s goals enables participants to feel a spirit of challenge with a purpose and a sense of fulfillment in their daily lives.

  11. An analysis of structural relationship among achievement motive on social participation, purpose in life, and role expectations among community dwelling elderly attending day services.

    Science.gov (United States)

    Sano, Nobuyuki; Kyougoku, Makoto

    2016-01-01

    Background. Achievement motive is defined as the intention to achieve one's goals. Achievement motive is assumed to promote clients to choices and actions toward their valuable goal, so it is an important consideration in rehabilitation. Purpose. The purpose of this study is to demonstrate the structural relationship among achievement motive on purpose in life, social participation, and role expectation of community-dwelling elderly people. Methods. Participants were community-dwelling elderly people in day-service centers. A total of 281 participants (male: 127, female: 154) answered the self-administered questionnaire in cross-sectional research. The questionnaire was comprised of demographic data and scales that evaluated achievement motive, social participation, purpose in life, and role expectation. We studied the structural relationship established by our hypothesized model via a structural equation modeling approach. Results. We checked the standardized path coefficients and the modification indices; the modified model's statistics were a good fit: CFI = 0.984, TLI = 0.983, RMSEA = 0.050, 90% CI [0.044-0.055]. Achievement motive had a significantly direct effect on purpose in life (direct effect = 0.445, p value < 0.001), a significantly indirect effect on purpose in life via social participation or role expectation (indirect effect = 0.170, p value < 0.001) and a total effect on purpose in life (total effect = 0.615). Discussion. This result suggests that enhancing the intention to achieve one's goals enables participants to feel a spirit of challenge with a purpose and a sense of fulfillment in their daily lives.

  12. ECOSYSTEM SERVICES OF THE NIGER DELTA FORESTS ...

    African Journals Online (AJOL)

    forest, the rural respondents had zero knowledge of many of the services. Despite the ... “production, regulating, habitat, carrier, and information, to provide capacity to produce a ... plants and birds, remain unstudied in large areas". Powell ... synonymous with life itself, with spiritual sustenance, with wealth and prosperity ...

  13. Energy use in repairs by cover concrete replacement or silane treatment for extending service life of chloride-exposed concrete structures

    Science.gov (United States)

    Petcherdchoo, A.

    2018-05-01

    In this study, the service life of repaired concrete structures under chloride environment is predicted. This prediction is performed by considering the mechanism of chloride ion diffusion using the partial differential equation (PDE) of the Fick’s second law. The one-dimensional PDE cannot simply be solved, when concrete structures are cyclically repaired with cover concrete replacement or silane treatment. The difficulty is encountered in solving position-dependent chloride profile and diffusion coefficient after repairs. In order to remedy the difficulty, the finite difference method is used. By virtue of numerical computation, the position-dependent chloride profile can be treated position by position. And, based on the Crank-Nicolson scheme, a proper formulation embedded with position-dependent diffusion coefficient can be derived. By using the aforementioned idea, position- and time-dependent chloride ion concentration profiles for concrete structures with repairs can be calculated and shown, and their service life can be predicted. Moreover, the use of energy in different repair actions is also considered for comparison. From the study, it is found that repairs can control rebar corrosion and/or concrete cracking depending on repair actions.

  14. On using continuoas Markov processes for unit service life evaluation taking as an example the RBMK-1000 gate-regulating valve

    International Nuclear Information System (INIS)

    Klemin, A.I.; Emel'yanov, V.S.; Rabchun, A.V.

    1984-01-01

    A technique is sugfested for estimating service life indices of equipment based on describing the process of the equipment ageing by continuous Markov diffusion process. It is noted that a number of problems on estimating durability indices of products is reduced to problems of estimating characteristics of the time of the first attainment of the preset boundary (boundaries) by a random process describing the ageing of a product. The methods of statistic estimation of the drift and diffusion coefficient in the continuous Markov diffusion process are considered formulae for their point and interval estimates are presented. A special description is given for a case of a stationary process and determining in this case mathematical expectation and dispersion of the time of the first attainment of a boundary (boundaries). The method of numerical simulation of the diffusion process with constant drift and diffusion coefficients is also described; results obtained on the basis of such a simulation are discussed. An example of using the suggested technique for quantitative estimate of the service life for the RBMK-1000 gate-regulating value is given

  15. Clinical Utility and Psychometric Properties of the Traumatic Brain Injury Quality of Life Scale (TBI-QOL) in US Military Service Members.

    Science.gov (United States)

    Lange, Rael T; Brickell, Tracey A; Bailie, Jason M; Tulsky, David S; French, Louis M

    2016-01-01

    To examine the clinical utility and psychometric properties of the Traumatic Brain Injury Quality of Life (TBI-QOL) scale in a US military population. One hundred fifty-two US military service members (age: M = 34.3, SD = 9.4; 89.5% men) prospectively enrolled from the Walter Reed National Military Medical Center and other nationwide community outreach initiatives. Participants included 99 service members who had sustained a mild traumatic brain injury (TBI) and 53 injured or noninjured controls without TBI (n = 29 and n = 24, respectively). Participants completed the TBI-QOL scale and 5 other behavioral measures, on average, 33.8 months postinjury (SD = 37.9). Fourteen TBI-QOL subscales; Neurobehavioral Symptom Inventory; Posttraumatic Stress Disorder Checklist-Civilian version; Alcohol Use Disorders Identification Test; Combat Exposure Scale. The internal consistency reliability of the TBI-QOL scales ranged from α = .91 to α = .98. The convergent and discriminant validity of the 14 TBI-QOL subscales was high. The mild TBI group had significantly worse scores on 10 of the 14 TBI-QOL subscales than the control group (range, P quality of life in a mild TBI military sample. Additional research is recommended to further evaluate the clinical utility of the TBI-QOL scale in both military and civilian settings.

  16. Predicting the service life of connecting rod and main bearings, taking into account different engine loads. Final report; Lebensdauervorhersage fuer Pleuel- und Hauptlager unter Beruecksichtigung unterschiedlicher Motorlastkollektive. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Berkowitz, B.; Lueneburg, B.; Liu, J.

    1994-12-31

    Connecting rod and main bearings of internal combustion engines are among the most heavily stressed components in modern engines. It was found that these engine components are increasingly reaching the limits of their strength and therefore become the components limiting engine life. However, there is no known process which makes a calculated prediction of the service life of modern connecting rod and main bearings possible, taking into account various engine loads. In this research project, a new concept for the calculated prediction of the service life of non-static highly loaded radial sliding bearings is worked out. The basis is a process of calculation which realistically determines the pressure and gap course in highly loaded sliding bearings. Apart from the viscosity depending on pressure and temperature, the elastic deformations of the system sliding bearing/conn rod are also taken into account. Calculations are done for different operating points for a complete cycle of a four stroke Diesel engine (Daimler-Benz OM 364 LA). The results are compared with the present conventional process of calculation and the effects which occur are discussed. Based on the elasto-hydrodynamic calculation, a method of calculating the service life of non-statically loaded sliding bearings, taking into account various motor loads, is worked out. (orig./HW) [Deutsch] Pleuel- und Hauptlager von Verbrennungskraftmaschinen zaehlen mit zu den spezifisch am hoechsten beanspruchten Bauteilen in modernen Motoren. Es hat sich gezeigt, dass vor allem diese Maschinenelemente zunehmend an die Grenzen ihrer Belastbarkeit stossen und so zum lebensdauerbegrenzenden Bauteil werden. Es ist jedoch kein Verfahren bekannt, das eine rechnerische Lebensdauervorhersage moderner Pleuel- und Hauptlager unter Beruecksichtigung unterschiedlicher Motorlastkollektive ermoeglicht. Im vorliegenden Forschungsvorhaben wird daher ein neuartiges Konzept zur rechnerischen Lebensdauervorhersage von instationaeren

  17. Leadership and change commitment in the life insurance service context in Taiwan: the mediating-moderating role of job satisfaction.

    Science.gov (United States)

    Yang, Yi-Feng

    2011-06-01

    The effects of transformational leadership and satisfaction were studied along with their interconnected effects (mediation and moderation) on commitment to change in the life insurance industry in two samples, sales managers and salespersons. A multiple mediated-moderated regression approach showed mediation and moderation to have statistically significant main effects on change commitment. Transformational leadership and satisfaction made a more important contribution to change commitment while job satisfaction had a mediating and moderating role that could enhance the relationships between leadership and change commitment. This information is of importance in building successful change commitment associations with customers.

  18. Life cycle assessment of fossil and biomass power generation chains. An analysis carried out for ALSTOM Power Services

    Energy Technology Data Exchange (ETDEWEB)

    Bauer, Ch.

    2008-12-15

    This final report issued by the Technology Assessment Department of the Paul Scherrer Institute (PSI) reports on the results of an analysis carried out on behalf of the Alstom Power Services company. Fossil and biomass chains as well as co-combustion power plants are assessed. The general objective of this analysis is an evaluation of specific as well as overall environmental burdens resulting from these different options for electricity production. The results obtained for fuel chains including hard coal, lignite, wood, natural gas and synthetic natural gas are discussed. An overall comparison is made and the conclusions drawn from the results of the analysis are presented.

  19. CUSTOMER COST - SECOND IMPORTANT FACTOR FOR IMAGE GAP ANALYSIS OF LIFE INSURANCE SERVICES - BASED ON THE DATA COLLECTION FROM GUWAHATI

    OpenAIRE

    Pankaj Bihani; Prof. Amalesh Bhowal

    2017-01-01

    The concept of Customer Cost was developed by Lauterborn (1990) while developing the customer oriented Marketing Mix- the 4C concept. 4C model replaces the earlier 4Ps of Marketing Mix, here the focus is on customer and the current chapter is all about the second C of this model i.e. Customer Cost or Price in earlier 4P model. The Customer Cost concept is based on the fact that customers are more concerned with the total cost of acquiring a solution of their problem (Product or Service) rathe...

  20. Late-life anxiety disorders among Puerto Rican primary care patients: impact on well-being, functioning, and service utilization.

    Science.gov (United States)

    Diefenbach, Gretchen J; Robison, Julie T; Tolin, David F; Blank, Karen

    2004-01-01

    With the growing population of older Hispanic adults there is a need for additional research on the mental health care of this patient group. This study explored the impact of anxiety disorders on the health status of 291 older (>/=50 years) Puerto Rican primary care patients (n = 65 with anxiety disorders, n = 226 without anxiety disorders). All analyses controlled for potential confounding variables, including depression diagnosis and physical health burden. Logistic regression indicated that anxiety disorders were associated with higher psychological distress, suicidality, and emergency room service utilization, as well as lower instrumental functioning and perceived health quality. Analysis of covariance indicated that both anxiety disorder status and history of ataque de nervios were related to higher percentages of lifetime somatic symptoms. These data highlight the need for improved recognition and treatment of anxiety disorders in older Puerto Rican adults.

  1. Assessing the impact of care farms on quality of life and offending: a pilot study among probation service users in England.

    Science.gov (United States)

    Elsey, Helen; Farragher, Tracey; Tubeuf, Sandy; Bragg, Rachel; Elings, Marjolein; Brennan, Cathy; Gold, Rochelle; Shickle, Darren; Wickramasekera, Nyantara; Richardson, Zoe; Cade, Janet; Murray, Jenni

    2018-03-17

    To assess the feasibility of conducting a cost-effectiveness study of using care farms (CFs) to improve quality of life and reduce reoffending among offenders undertaking community orders (COs). To pilot questionnaires to assess quality of life, connection to nature, lifestyle behaviours, health and social-care use. To assess recruitment and retention at 6 months and feasibility of data linkage to Police National Computer (PNC) reconvictions data and data held by probation services. Pilot study using questionnaires to assess quality of life, individually linked to police and probation data. The pilot study was conducted in three probation service regions in England. Each site included a CF and at least one comparator CO project. CFs are working farms used with a range of clients, including offenders, for therapeutic purposes. The three CFs included one aquaponics and horticulture social enterprise, a religious charity focusing on horticulture and a family-run cattle farm. Comparator projects included sorting secondhand clothes and activities to address alcohol misuse and anger management. We recruited 134 adults (over 18) serving COs in England, 29% female. 52% of participants completed follow-up questionnaires. Privatisation of UK probation trusts in 2014 negatively impacted on recruitment and retention. Linkage to PNC data was a more successful means of follow-up, with 90% consenting to access their probation and PNC data. Collection of health and social-care costs and quality-adjusted life year derivation were feasible. Propensity score adjustment provided a viable comparison method despite differences between comparators. We found worse health and higher reoffending risk among CF participants due to allocation of challenging offenders to CFs, making risk of reoffending a confounder. Recruitment would be feasible in a more stable probation environment. Follow-up was challenging; however, assessing reconvictions from PNC data is feasible and a potential primary

  2. Vacuum Insulation Panels - Study on VIP-components and panels for service life prediction of VIP in building applications (Subtask A)

    Energy Technology Data Exchange (ETDEWEB)

    Simmler, H.; Brunner, S. [Swiss Federal Laboratories for Materials Testing and Research (EMPA), Duebendorf (Switzerland); Heinemann, U.; Schwab, H. [Bavarian Centre for Applied Energy Research (ZAE Bayern), Garching (Germany); Kumaran, K.; Mukhopadhyaya, P. [National Research Council, Institute for Research in Construction (NRC-IRC), Ottawa (Canada); Quenard, D.; Sallee, H. [Scientific and Technical Centre for Construction (CSTB), Marne la Vallee (France); Noller, K.; Kuecuekpinar-Niarchos, E.; Stramm, C. [Fraunhofer Institute for Process Engineering and Packaging (IVV), Freising (Germany); Tenpierik, M.; Cauberg, H. [Technical University of Delft, Delft (Netherlands); Erb, M. [Dr. Eicher und Pauli AG (Switzerland)

    2005-09-15

    This comprehensive paper takes a look at the properties of vacuum insulation panels (VIP) and was presented as a contribution to the IEA's ECBCS (Energy Conservation in Buildings and Community Systems) Annex 39. The various institutions in Switzerland, Germany, Canada, France, Sweden and the Netherlands participating in the task and their activities are listed. The paper describes the concept of vacuum insulation for buildings and examines the physics involved and core materials that can be used. The physical, mechanical and thermal properties of the core materials are examined and the requirements placed on the envelope of the panels are looked at. Tests made on materials as well as on the complete vacuum insulation panels are described in detail. The results obtained are presented and reviewed. Service-life and quality assurance aspects are also discussed. A comprehensive appendix completes the report.

  3. Anaerobic co-digestion of municipal food waste and sewage sludge: A comparative life cycle assessment in the context of a waste service provision.

    Science.gov (United States)

    Edwards, Joel; Othman, Maazuza; Crossin, Enda; Burn, Stewart

    2017-01-01

    This study used life cycle assessment to evaluate the environmental impact of anaerobic co-digestion (AcoD) and compared it against the current waste management system in two case study areas. Results indicated AcoD to have less environmental impact for all categories modelled excluding human toxicity, despite the need to collect and pre-treat food waste separately. Uncertainty modelling confirmed that AcoD has a 100% likelihood of a smaller global warming potential, and for acidification, eutrophication and fossil fuel depletion AcoD carried a greater than 85% confidence of inducing a lesser impact than the current waste service. Crown Copyright © 2016. Published by Elsevier Ltd. All rights reserved.

  4. Learning motivational interviewing in a real-life setting: a randomised controlled trial in the Swedish Prison Service.

    Science.gov (United States)

    Forsberg, Lars; Ernst, Denise; Farbring, Carl Åke

    2011-07-01

    Motivational interviewing (MI) is a client-centred, directive counselling style for helping people to explore and resolve ambivalence about behaviour change and shown to decrease drug and alcohol use. A five-session semi-structured MI intervention [Beteende, Samtal, Förändring (BSF; Behaviour, Counselling, Change)] was implemented in Swedish prisons. To examine whether, in a real-life implementation of semi-structured MI, staff receiving ongoing MI training, based on audio-recorded feedback in peer groups (BSF+), possess greater MI skill compared with staff receiving workshop-only MI training (BSF), and staff conducting usual prison planning interviews (UPI). Prisoners were randomised to one of the three interventions. The fi rst sessions between staff and prisoner with complete data were assessed with the Motivational Interviewing Treatment Integrity Code 3.0. Content analysis of 45 staff: prisoner sessions revealed that counsellors in the BSF+ group were significantly more competent in MI than those in the UPI group, but there was no difference in MI competency between the BSF and UPI groups. Overall, staff were rated as not having achieved beginning proficiency. Our findings suggest that staff delivering motivational interviewing programmes for substance-misusing prisoners in Sweden are not being given sufficient training for the task. Previous literature has suggested that staff need more than a basic 3- to 5-day workshop training, but our findings suggest that they may need longer-term continuing supervision and support than previously recognised.

  5. Cardiopulmonary resuscitation knowledge and opinions on end of life decision making of older adults admitted to an acute medical service.

    Science.gov (United States)

    Sharma, Rupali; Jayathissa, Sisira; Weatherall, Mark

    2016-01-08

    To determine the knowledge in cardiopulmonary resuscitation (CPR) process, preference for CPR, and desire to participate in end-of-life decision making amongst older hospitalised patients. We prospectively interviewed 100 participants above 65 years of age awaiting discharge from acute medical ward and collected demographics, knowledge of CPR and opinion on CPR in various clinical scenarios. Amongst the participants, 58% had good understanding of all components of CPR and 91% overestimated its success. Fifty-eight percent wished to have CPR in current health status, but this declined if they were presented a hypothetical scenario of critical illness (46%), functional impairment (17%), terminal illness (13%) and dementia (13%). Tertiary education, male gender and not living alone were associated with accepting CPR. Ninety-three percent were comfortable discussing CPR and 84% felt comfortable documenting their wishes in the medical notes. Seventy percent wished such discussion to include themselves and their family. Older inpatients have a reasonable understanding of the components of CPR and wish to be involved in CPR decision-making. Clinical scenarios with poor prognosis may lead to patients declining CPR. Discussion and documentation of resuscitation wishes is useful in routine assessment process among elderly hospitalised patients.

  6. Frailty and its impact on health-related quality of life: a cross-sectional study on elder community-dwelling preventive health service users.

    Directory of Open Access Journals (Sweden)

    Yaw-Wen Chang

    Full Text Available BACKGROUND: The purpose of this study was to identify the incidence of frailty and to investigate the relationship between frailty status and health-related quality of life (HRQoL in the community-dwelling elderly population who utilize preventive health services. METHODS: People aged 65 years and older who visited a medical center in Taipei City from March to August in 2011 for an annual routine check-up provided by the National Health Insurance were eligible. A total of 374 eligible elderly adults without cognitive impairment had a mean age of 74.6±6.3 years. Frailty status was determined according to the Fried frailty criteria. HRQoL was measured with Short Form-36 (SF-36. Multiple regression analyses examined the relationship between frailty status and the two summary scales of SF-36. Models were adjusted for the participants' sociodemographic and health status. RESULTS: After adjusting for sociodemographic and health-related covariables, frailty was found to be more significantly associated (p<0.001 with lower scores on both physical and mental health-related quality of life summary scales compared with robustness. For the frailty phenotypes, slowness represented the major contributing factor in the physical component scale of SF-36, and exhaustion was the primary contributing factor in the mental component scale. CONCLUSION: The status of frailty is closely associated with HRQoL in elderly Taiwanese preventive health service users. The impacts of frailty phenotypes on physical and mental aspects of HRQoL differ.

  7. A Demonstration Marine Biodiversity Observation Network (MBON): Understanding Marine Life and its Role in Maintaining Ecosystem Services

    Science.gov (United States)

    Muller-Karger, F. E.; Iken, K.; Miller, R. J.; Duffy, J. E.; Chavez, F.; Montes, E.

    2016-02-01

    The U.S. Federal government (NOAA, NASA, BOEM, and the Smithsonian Institution), academic researchers, and private partners are laying the foundation for a Marine Biodiversity Observation Network (MBON). The goals of the network are to: 1) Observe and understand life, from microbes to whales, in different coastal and continental shelf habitats; 2) Define an efficient set of observations required for implementing a useful MBON; 3) Develop technology for biodiversity assessments including emerging environmental DNA (eDNA), remote sensing, and image analysis methods to coordinate with classical sampling; 4) Integrate and synthesize information in coordination with the Integrated Ocean Observing System (IOOS), the international Group on Earth Observations Biodiversity Observation Network(GEO BON), and the Ocean Biogeographic Information System (OBIS) sponsored by UNESCO's Intergovernmental Oceanographic Commission (IOC); and 5) Understand the linkages between marine biodiversity, ecosystem processes, and the social-economic context of a region. Pilot projects have been implemented within three NOAA National Marine Sanctuaries (Florida Keys, Monterey Bay, and Channel Islands), the wider Santa Barbara Channel, in the Chukchi Sea, and through the Smithsonian's Tennenbaum Marine Observatories Network (TMON) at several sites in the U.S. and collaborating countries. Together, these MBON sites encompass a wide range of marine environments, including deep sea, continental shelves, and coastal habitats including estuaries, wetlands, and coral reefs. The present MBON partners are open to growth of the MBON through additional collaborations. Given these initiatives, GEO BON is proposing an MBON effort that spans from pole to pole, with a pathfinder effort among countries in the Americas. By specializing in coastal ecosystems—where marine biodiversity and people are concentrated and interact most—the MBON and TMON initiatives aim to provide policymakers with the science to

  8. Parental palliative cancer: psychosocial adjustment and health-related quality of life in adolescents participating in a German family counselling service

    Directory of Open Access Journals (Sweden)

    Kühne Franziska

    2012-10-01

    Full Text Available Abstract Background Parental palliative disease is a family affair, however adolescent's well-being and coping are still rarely considered. The objectives of this paper were a to identify differences in psychosocial adjustment and health-related quality of life (HRQoL among adolescents and young adults with parents suffering from palliative cancer or cancers in other disease stages, b to relate psychosocial adjustment and health-related quality of life to adolescent coping, and c to explore significant mediator and predictor variables. Methods Cross-sectional data were derived from a multi-site research study of families before child-centered counselling. N=86 adolescents and young adults were included, their mean age 13.78 years (sd 2.45, 56% being female. Performed analyses included ANCOVA, multiple linear regression, and mediation analysis. Results Adolescents with parents suffering from palliative cancers reported significantly less total psychosocial problems, and better overall HRQoL. There were no significant group differences regarding coping frequency and efficacy. Our set of coping items significantly mediated the effect of parental disease stage on psychosocial problems and HRQoL. Further, parental disease status and general family functioning predicted psychosocial problems (R2adj =.390 and HRQoL (R2adj =.239 best. Conclusion The study indicates distress among adolescents throughout the entire parental disease process. Our analysis suggests that counselling services could offer supportive interventions which focus particularly on adolescent coping as well as family functioning.

  9. Some principles of service life calculation of reinforcements and in situ corrosion monitoring by sensors in the radioactive waste containers of El Cabril disposal (Spain)

    International Nuclear Information System (INIS)

    Andrade, C.; Martinez, I.; Castellote, M.; Zuloaga, P.

    2006-01-01

    Reinforced concrete is the most usual material used in engineered barriers in low-level nuclear waste disposal facilities. The record of modern concrete is no longer than about 100 years. During this time, it has been noticed that the material gives a good performance in many environments, however several chemical aggressive species in water, soil or the atmosphere may react with the cement mineralogical phases and perturb its integrity. El Cabril repository has a design life objective of longer than 300 years and therefore, these structures should maintain their main characteristics during this target service life. The potential aggressive conditions that the cement-based materials can suffer have been identified to be: carbonation, water permeation (leaching) and reinforcement corrosion. More unlikely may be the biological attack. Chlorides are not in the environment but they are inside the drums as part of analytical wastes. Vaults and containers are made of a very similar concrete composition while the mortar is specifically designed to be pumpable, with low hydration heat, low shrinkage and of low permeability. In this paper results of concrete characteristics are given as well as the monitoring of the behaviour of reinforcement corrosion parameters from 1995 on the same environmental conditions of the actual waste. This monitoring has been made in a buried structure with embedded sensors. The effect of temperature is commented

  10. Challenges in access to health services and its impact on quality of life: a randomised population-based survey within Turkish speaking immigrants in London

    Directory of Open Access Journals (Sweden)

    Topal Kenan

    2012-01-01

    Full Text Available Abstract Background and aim There are a significant number of Turkish speaking immigrants living in London. Their special health issues including women's health, mental health, and alcohol and smoking habits has been assessed. The aim of this study was to explore the ongoing challenges in access to health care services and its impact on Quality of Life of immigrants. Material and methods This cross-sectional population-based study was conducted between March and August 2010 with Turkish immigrants (n = 416 living in London. Of these, 308 (74% were Turkish and 108 (26% were Turkish Cypriots. All healthy or unhealthy adults of 17-65 years of age were enrolled. A structured questionnaire with 44 items in five subcategories and 26-items WHOQOL BREF were used. Results Mean duration of stay for Turkish Cypriots (26.9 ± 13.9 years was significantly longer than Turkish immigrants (13.3 ± 7.5 (p Conclusions The results of this study demonstrate how the health and well-being of members of the Turkish speaking community living in London are affected by social aspects of their lives. Providing culturally competent care and interpretation services and advocacy may improve the accessibility of the health care.

  11. A study protocol for tracking quality of life among U.S. service members wounded in Iraq and Afghanistan: the Wounded Warrior Recovery Project.

    Science.gov (United States)

    Woodruff, Susan I; Galarneau, Michael R; Luu, Bethi N; Sack, Daniel; Han, Peggy

    2014-03-01

    There is a need for more work to understand the quality of life (QOL) outcomes of survivors of Operations Enduring Freedom and Iraqi Freedom combat injury to improve care and treatment, and prevent poor physical, psychological, and social outcomes. We describe the study design and methods of the Wounded Warrior Recovery Project, a study supported by the Department of Defense that will track close to 10,000 military personnel wounded in Operations Enduring Freedom and Iraqi Freedom. The overall objective of the 6-year longitudinal study is to track changes in QOL and describe variations in those changes as they relate to sociodemographic factors, injury characteristics, service-related factors, clinical/diagnostic measures including traumatic brain injury and posttraumatic stress disorder, and medical procedures and services. The Wounded Warrior Recovery Project study will be among the first longitudinal population-based investigations of QOL outcomes after combat injury and will provide a basis upon which large-scale epidemiological studies can be conducted. Reprint & Copyright © 2014 Association of Military Surgeons of the U.S.

  12. Using contractors to decommission while remaining as licensee

    International Nuclear Information System (INIS)

    Rankine, A.

    1997-01-01

    Over the last few years the role of the United Kingdom Atomic Energy Authority (UKAEA) has changed from one involved in research and development in the field of nuclear power and associated technology, to one of managing the liabilities left over from its previous mission. This period has also seen two significant portions of the organization move to the private sector with sale of the Facilities Services Division to PROCORD and the privatization of AEA Technology. The new UKAEA is therefore a focused liabilities management organization, making the best use of expertise in the private sector in carrying out its mission, but retaining adequate internal resource and expertise to fulful its role and responsibilities as the licensee. UKAEA continues to be committed to giving the highest priority to meeting high standards of safety and environmental protection required of the holder of the Nuclear Site Licence under the Nuclear Installations Act. This paper describes the safety management system within the UKAEA which ensures that UKAEA remains the proper and effective licensee and gives some examples of how this has worked in practice. (author)

  13. Energy saving potential of energy services - experimentation on the life cycle of energy conversion equipment; Potentiel d'economies d'energie par les services energetiques - application au cycle de vie des equipements de conversion de l'energie

    Energy Technology Data Exchange (ETDEWEB)

    Dupont, M

    2006-12-15

    Energy efficiency services are growing in Europe but their role is still limited. In order to evaluate the potential, we focused first of all on policy, economical and environmental mechanisms that support their development. European natural gas and electricity markets, that are now almost wholly de-regulated, are analysed and compared to their historical structure. By introducing uncertainty on energy prices, this new deal translates better the real energy costs. Energy performance contracts (EPC) limit the impact of these uncertainties on the customer energy bills by guaranteeing a financial result. As a result of the modelling of these contracts, namely operation and maintenance ones, we prove that they transfer technical and financial risks from building owners to energy service companies (ESCO) making energy saving measures easier and less expensive at the same time. These contracts are relatively widespread for heating or compressed-air processes but remain marginal for air-conditioning systems. So new methods were needed to guarantee on the long terms the efficiency of air-conditioning systems demand (1) to master the process and its performances and (2) to be able to determine precisely the energy saving potential and its realisation costs. A detailed energy audit is thus necessary for which we propose a guidance. Conclusions of audits carried out prove that energy saving potential is mainly located in equipment management and control. These optimizations are not always carried out because of a lack of contractual incentive and due to the weaknesses of audit methods. Through the involvement of an independent expert, the mandatory and regular inspection of air-conditioning systems may allow to verify and guide such practices. A three-step analysis procedure has been developed in order to maximize the inspection potential and to get higher benefits from service contracts. (author)

  14. Examination of Life Satisfaction, Child Maltreatment Potential and Substance Use in Mothers Referred for Treatment by Child Protective Services for Child Neglect and Substance Abuse: Implications for Intervention Planning

    OpenAIRE

    Plant, Christopher P.; Donohue, Brad; Holland, Jason M.

    2015-01-01

    There is evidence to suggest mothers who are served by child protective service agencies are relatively dissatisfied in their lives, leading some investigators to conclude life dissatisfaction may be associated with child maltreatment. To assist in better understanding this relationship the Life Satisfaction Scale for Caregivers (LSSC) was psychometrically developed in a sample of 72 mothers who were referred for behavioral treatment for child neglect and substance abuse by caseworkers from a...

  15. Future Remains: Industrial Heritage at the Hanford Plutonium Works

    Science.gov (United States)

    Freer, Brian

    This dissertation argues that U.S. environmental and historic preservation regulations, industrial heritage projects, history, and art only provide partial frameworks for successfully transmitting an informed story into the long range future about nuclear technology and its related environmental legacy. This argument is important because plutonium from nuclear weapons production is toxic to humans in very small amounts, threatens environmental health, has a half-life of 24, 110 years and because the industrial heritage project at Hanford is the first time an entire U.S. Department of Energy weapons production site has been designated a U.S. Historic District. This research is situated within anthropological interest in industrial heritage studies, environmental anthropology, applied visual anthropology, as well as wider discourses on nuclear studies. However, none of these disciplines is really designed or intended to be a completely satisfactory frame of reference for addressing this perplexing challenge of documenting and conveying an informed story about nuclear technology and its related environmental legacy into the long range future. Others have thought about this question and have made important contributions toward a potential solution. Examples here include: future generations movements concerning intergenerational equity as evidenced in scholarship, law, and amongst Native American groups; Nez Perce and Confederated Tribes of the Umatilla Indian Reservation responses to the Hanford End State Vision and Hanford's Canyon Disposition Initiative; as well as the findings of organizational scholars on the advantages realized by organizations that have a long term future perspective. While these ideas inform the main line inquiry of this dissertation, the principal approach put forth by the researcher of how to convey an informed story about nuclear technology and waste into the long range future is implementation of the proposed Future Remains clause, as

  16. The broad spectrum revisited: evidence from plant remains.

    Science.gov (United States)

    Weiss, Ehud; Wetterstrom, Wilma; Nadel, Dani; Bar-Yosef, Ofer

    2004-06-29

    The beginning of agriculture is one of the most important developments in human history, with enormous consequences that paved the way for settled life and complex society. Much of the research on the origins of agriculture over the last 40 years has been guided by Flannery's [Flannery, K. V. (1969) in The Domestication and Exploitation of Plants and Animals, eds. Ucko, P. J. & Dimbleby, G. W. (Duckworth, London), pp. 73-100] "broad spectrum revolution" (BSR) hypothesis, which posits that the transition to farming in southwest Asia entailed a period during which foragers broadened their resource base to encompass a wide array of foods that were previously ignored in an attempt to overcome food shortages. Although these resources undoubtedly included plants, nearly all BSR hypothesis-inspired research has focused on animals because of a dearth of Upper Paleolithic archaeobotanical assemblages. Now, however, a collection of >90,000 plant remains, recently recovered from the Stone Age site Ohalo II (23,000 B.P.), Israel, offers insights into the plant foods of the late Upper Paleolithic. The staple foods of this assemblage were wild grasses, pushing back the dietary shift to grains some 10,000 years earlier than previously recognized. Besides the cereals (wild wheat and barley), small-grained grasses made up a large component of the assemblage, indicating that the BSR in the Levant was even broader than originally conceived, encompassing what would have been low-ranked plant foods. Over the next 15,000 years small-grained grasses were gradually replaced by the cereals and ultimately disappeared from the Levantine diet.

  17. End of Life: An Overview

    Science.gov (United States)

    Toner, Mary Ann; Shadden, Barbara B.

    2012-01-01

    Speech-language pathologists (SLPs) provide services to patients confronting the end of life (EOL) in a variety of settings. Instead of targeting improvement of health or sustaining life, EOL services focus primarily on quality of life. Although SLPs may not consider themselves core members of the health care team providing EOL services, the…

  18. Integrating Science Content and Pedagogy in the Earth, Life, and Physical Sciences: A K-8 Pre-Service Teacher Preparation Continuum at the University of Delaware

    Science.gov (United States)

    Madsen, J.; Allen, D.; Donham, R.; Fifield, S.; Ford, D.; Shipman, H.; Dagher, Z.

    2007-12-01

    University of Delaware faculty in the geological sciences, biological sciences, and the physics and astronomy departments have partnered with faculty and researchers from the school of education to form a continuum for K- 8 pre-service teacher preparation in science. The goal of the continuum is to develop integrated understandings of content and pedagogy so that these future teachers can effectively use inquiry-based approaches in teaching science in their classrooms. Throughout the continuum where earth science content appears an earth system science approach, with emphasis on inquiry-based activities, is employed. The continuum for K-8 pre-service teachers includes a gateway content course in the earth, life, or physical sciences taken during the freshman year followed by integrated science content and methods courses taken during the sophomore year. These integrated courses, called the Science Semester, were designed and implemented with funding from the National Science Foundation. During the Science Semester, traditional content and pedagogy subject matter boundaries are crossed to stress shared themes that teachers must understand to teach standards-based science. Students work collaboratively on multidisciplinary problem-based learning (PBL) activities that place science concepts in authentic contexts and build learning skills. They also critically explore the theory and practice of elementary science teaching, drawing on their shared experiences of inquiry learning during the Science Semester. The PBL activities that are the hallmark of the Science Semester provide the backdrop through which fundamental earth system interactions can be studied. For example in a PBL investigation that focuses on kids, cancer, and the environment, the hydrologic cycle with emphasis on surface runoff and ground water contamination is studied. Those students seeking secondary certification in science will enroll, as a bridge toward their student teaching experience, in an

  19. Probabilistic Remaining Useful Life Prediction of Composite Aircraft Components, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — A composite fatigue damage assessment and risk informed prognosis toolkit will be developed by enhancing and integrating existing solution modules within a...

  20. An Adaptive Recurrent Neural Network for Remaining Useful Life Prediction of Lithium-ion Batteries

    Data.gov (United States)

    National Aeronautics and Space Administration — Prognostics is an emerging science of predicting the health condition of a system (or its components) based upon current and previous system states. A reliable...