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Sample records for satisfaction arcs model

  1. Modeling Arcs

    CERN Document Server

    Insepov, Zeke; Veitzer, Seth; Mahalingam, Sudhakar

    2011-01-01

    Although vacuum arcs were first identified over 110 years ago, they are not yet well understood. We have since developed a model of breakdown and gradient limits that tries to explain, in a self-consistent way: arc triggering, plasma initiation, plasma evolution, surface damage and gra- dient limits. We use simple PIC codes for modeling plasmas, molecular dynamics for modeling surface breakdown, and surface damage, and mesoscale surface thermodynamics and finite element electrostatic codes for to evaluate surface properties. Since any given experiment seems to have more variables than data points, we have tried to consider a wide variety of arcing (rf structures, e beam welding, laser ablation, etc.) to help constrain the problem, and concentrate on common mechanisms. While the mechanisms can be comparatively simple, modeling can be challenging.

  2. Arc Plasma Torch Modeling

    CERN Document Server

    Trelles, J P; Vardelle, A; Heberlein, J V R

    2013-01-01

    Arc plasma torches are the primary components of various industrial thermal plasma processes involving plasma spraying, metal cutting and welding, thermal plasma CVD, metal melting and remelting, waste treatment and gas production. They are relatively simple devices whose operation implies intricate thermal, chemical, electrical, and fluid dynamics phenomena. Modeling may be used as a means to better understand the physical processes involved in their operation. This paper presents an overview of the main aspects involved in the modeling of DC arc plasma torches: the mathematical models including thermodynamic and chemical non-equilibrium models, turbulent and radiative transport, thermodynamic and transport property calculation, boundary conditions and arc reattachment models. It focuses on the conventional plasma torches used for plasma spraying that include a hot-cathode and a nozzle anode.

  3. Modeling rf breakdown arcs

    CERN Document Server

    Insepov, Zeke; Huang, Dazhang; Mahalingam, Sudhakar; Veitzer, Seth

    2010-01-01

    We describe breakdown in 805 MHz rf accelerator cavities in terms of a number of mechanisms. We devide the breakdown process into three stages: (1) we model surface failure using molecular dynamics of fracture caused by electrostatic tensile stress, (2) we model the ionization of neutrals responsible for plasma initiation and plasma growth using a particle in cell code, and (3) we model surface damage by assuming a process similar to unipolar arcing. Although unipolar arcs are strictly defined with equipotential boundaries, we find that the cold, dense plasma in contact with the surface produces very small Debye lengths and very high electric fields over a large area. These high fields produce strong erosion mechanisms, primarily self sputtering, compatible with the crater formation that we see. Results from the plasma simulation are included as a guide to experimental verification of this model.

  4. Using the ARCS Model To Design Multimedia College Engineering Courses.

    Science.gov (United States)

    Shellnut, Bonnie; Savage, Timothy; Knowlton, Allie

    This paper describes how a Wayne State University (Michigan) multimedia design team is applying Keller's ARCS (Attention, Relevance, Confidence, and Satisfaction) Model of Motivational Design to the entire process of design, development, and evaluation of multimedia courseware. The ARCS Model has been applied to the prototype module and is being…

  5. Applying the ARCS Motivation Model in Technological and Vocational Education

    Science.gov (United States)

    Liao, Hung-Chang; Wang, Ya-huei

    2008-01-01

    This paper describes the incorporation of Keller's ARCS (Attention, Relevance, Confidence, and Satisfaction) motivation model into traditional classroom instruction-learning process. Viewing that technological and vocational students have low confidence and motivation in learning, the authors applied the ARCS motivation model not only in the…

  6. MODELING PARAMETERS OF ARC OF ELECTRIC ARC FURNACE

    Directory of Open Access Journals (Sweden)

    R.N. Khrestin

    2015-08-01

    Full Text Available Purpose. The aim is to build a mathematical model of the electric arc of arc furnace (EAF. The model should clearly show the relationship between the main parameters of the arc. These parameters determine the properties of the arc and the possibility of optimization of melting mode. Methodology. We have built a fairly simple model of the arc, which satisfies the above requirements. The model is designed for the analysis of electromagnetic processes arc of varying length. We have compared the results obtained when testing the model with the results obtained on actual furnaces. Results. During melting in real chipboard under the influence of changes in temperature changes its properties arc plasma. The proposed model takes into account these changes. Adjusting the length of the arc is the main way to regulate the mode of smelting chipboard. The arc length is controlled by the movement of the drive electrode. The model reflects the dynamic changes in the parameters of the arc when changing her length. We got the dynamic current-voltage characteristics (CVC of the arc for the different stages of melting. We got the arc voltage waveform and identified criteria by which possible identified stage of smelting. Originality. In contrast to the previously known models, this model clearly shows the relationship between the main parameters of the arc EAF: arc voltage Ud, amperage arc id and length arc d. Comparison of the simulation results and experimental data obtained from real particleboard showed the adequacy of the constructed model. It was found that character of change of magnitude Md, helps determine the stage of melting. Practical value. It turned out that the model can be used to simulate smelting in EAF any capacity. Thus, when designing the system of control mechanism for moving the electrode, the model takes into account changes in the parameters of the arc and it can significantly reduce electrode material consumption and energy consumption

  7. Modeling of Arc Force in Plasma Arc Welding

    Institute of Scientific and Technical Information of China (English)

    GAO Zhonglin; HU Shengsun; YIN Fengliang; WANG Rui

    2008-01-01

    A three. dimensional mathematical model for the transferred-type argon arc was developed to describe arc force on the anode surface. The software ANSYS was employed to solve the model. The model includes a part of torch and tungsten electrode to achieve m ore reasonable results. The arc temperature and flow fields were derived. And the influences of welding parameters on arc force were also studied. The simulated results show that arc pressure at the anode are dependent on the welding current, plasma gas flow rate and electrode neck-in, while not sensitive to arc length.

  8. A Simulation Model for Measuring Customer Satisfaction through Employee Satisfaction

    Science.gov (United States)

    Zondiros, Dimitris; Konstantopoulos, Nikolaos; Tomaras, Petros

    2007-12-01

    Customer satisfaction is defined as a measure of how a firm's product or service performs compared to customer's expectations. It has long been a subject of research due to its importance for measuring marketing and business performance. A lot of models have been developed for its measurement. This paper propose a simulation model using employee satisfaction as one of the most important factors leading to customer satisfaction (the others being expectations and disconfirmation of expectations). Data obtained from a two-year survey in customers of banks in Greece were used. The application of three approaches regarding employee satisfaction resulted in greater customer satisfaction when there is serious effort to keep employees satisfied.

  9. TOTAL QUALITY CUSTOMER SATISFACTION MODEL

    OpenAIRE

    Jesús Cruz Álvarez; Jesús Fabián López; Carlos Monge Perry

    2014-01-01

    In today’s business environment, all organizations are required to focus on their customers in order to fully understand their needs. There is a need to drive and engage strategic actions in order to close any potentials gaps between customer´s expectations and manufacture´s deliverables. Current customer satisfaction theory appears to be excluded from a holistic model that broadly covers the extent of customer satisfaction concept.This article empathizes the need of an integrated customer sa...

  10. Modeling and Simulation of Low Voltage Arcs

    NARCIS (Netherlands)

    Ghezzi, L.; Balestrero, A.

    2010-01-01

    Modeling and Simulation of Low Voltage Arcs is an attempt to improve the physical understanding, mathematical modeling and numerical simulation of the electric arcs that are found during current interruptions in low voltage circuit breakers. An empirical description is gained by refined electrical

  11. Modeling and Simulation of Low Voltage Arcs

    NARCIS (Netherlands)

    Ghezzi, L.; Balestrero, A.

    2010-01-01

    Modeling and Simulation of Low Voltage Arcs is an attempt to improve the physical understanding, mathematical modeling and numerical simulation of the electric arcs that are found during current interruptions in low voltage circuit breakers. An empirical description is gained by refined electrical m

  12. Electric arc furnace models for flicker study

    Directory of Open Access Journals (Sweden)

    Catalina González Castaño

    2016-06-01

    Full Text Available Objective: The aim of this paper is to evaluate voltage fluctuations or flicker of two electric arc furnace models through comparison with real data.Method: The first proposed model is founded on the energy conservation principle, which generates a non-linear differential equation modelling the electric arc voltage – current characteristics. Voltage fluctuations are generated using a chaotic circuit that modulates the amplitude of arc voltage. The second model is based on the empirical relationship between the arc diameter or length as well as voltage and electrical current on the arc. Voltage fluctuations are considered adding a random signal in the arc length. Both models are implemented in PSCADTM.Results: The results of both models are compared with real data taken at the most critical stage of the operation of the furnace, and they show that the model based on energy conservation has a lower average mean square error in the voltages and currents 5.6 V and 1.7 kA against 27,2 V y 3.38 kA obtained with the second model.Conclusions: Both models consider the nonlinearity and random behavior present in this type of load, validating their inclusion in computer models of electric power systems.

  13. An Overview of Customer Satisfaction Models.

    Science.gov (United States)

    Hom, Willard

    This document is a report on how California community colleges can incorporate customer satisfaction models and theories from business to better serve students. Emphasis is given to two levels of customer satisfaction: macro- and micro-models. Macro-models look at how customer satisfaction relates to other elements or priorities of community…

  14. Flipped Classroom Adapted to the ARCS Model of Motivation and Applied to a Physics Course

    Science.gov (United States)

    Asiksoy, Gülsüm; Özdamli, Fezile

    2016-01-01

    This study aims to determine the effect on the achievement, motivation and self-sufficiency of students of the flipped classroom approach adapted to Keller's ARCS (Attention, Relevance, Confidence and Satisfaction) motivation model and applied to a physics course. The study involved 66 students divided into two classes of a physics course. The…

  15. Modeling Customer's Satisfaction Behavior through Uninorms

    OpenAIRE

    Depaire, Benoit; Vanhoof, Koen; Wets, Geert

    2006-01-01

    During the last three decades, the focus of customer satisfaction research has shifted from what it was about the product or service that customers found satisfying to how and why customers became satisfied. This resulted into several models that try to explain the customer's satisfaction behaviour, among which the expectancy-disconfirmation paradigm is one of the most prominent models. This model identifies three elements which have an influence on the customer's satisfaction level: i.e perf...

  16. Arcing Model of a Disconnector and its Effect on VFTO

    Science.gov (United States)

    Lin, Xin; Wang, Na; Xu, Jianyuan

    2013-07-01

    In the computational process of very fast transient over-voltage (VFTO), it is essential to find an accurate model for a gas insulated substation. The arcing model of the disconnector is particularly important. The general arcing model is not able to give a good description of the arc development process. In this paper, based on the physical process of arcing and existing arc models (the exponential time-varying resistance model and the segmental arcing models), a dynamic arcing model is proposed, which is divided into two stages before and after the zero crossing. The dynamic arcing model combines hyperbola time-varying resistance and the Mayr model to describe the dynamic process of arcing. The present paper creates an arc model blockset upon the Matlab/Simulink software platform. Moreover for a specific 1100 kV station, VFTO is simulated in detail based on different arcing models. It is demonstrated that the dynamic arcing model can describe the physical arc process precisely and is useful for improving the accuracy of VFTO simulations.

  17. Electric Arc Furnace Modeling with Artificial Neural Networks and Arc Length with Variable Voltage Gradient

    Directory of Open Access Journals (Sweden)

    Raul Garcia-Segura

    2017-09-01

    Full Text Available Electric arc furnaces (EAFs contribute to almost one third of the global steel production. Arc furnaces use a large amount of electrical energy to process scrap or reduced iron and are relevant to study because small improvements in their efficiency account for significant energy savings. Optimal controllers need to be designed and proposed to enhance both process performance and energy consumption. Due to the random and chaotic nature of the electric arcs, neural networks and other soft computing techniques have been used for modeling EAFs. This study proposes a methodology for modeling EAFs that considers the time varying arc length as a relevant input parameter to the arc furnace model. Based on actual voltages and current measurements taken from an arc furnace, it was possible to estimate an arc length suitable for modeling the arc furnace using neural networks. The obtained results show that the model reproduces not only the stable arc conditions but also the unstable arc conditions, which are difficult to identify in a real heat process. The presented model can be applied for the development and testing of control systems to improve furnace energy efficiency and productivity.

  18. Examination of Alternative Models of Job Satisfaction

    Science.gov (United States)

    Aldag, Ramon J.; Brief, Arthur P.

    1978-01-01

    Researchers have generally assumed overall job satisfaction to be an additive function of weighted job satisfaction facet scores. This paper considers the linear compensatory model as well as two nonlinear alternatives. Available from: Ramon J. Aldag, University of Wisconsin, 1155 Observatory Drive, Madison, Wisconsin 53706. (Author)

  19. GUI for studying the parameters influence of the electric arc model for a three-phase electric arc furnace

    Science.gov (United States)

    Ghiormez, L.; Prostean, O.; Panoiu, M.; Panoiu, C.

    2017-01-01

    This paper presents an analysis regarding the modeling of the behavior for a three-phase electric arc furnace installation. Therefore, a block diagram is implemented in Simulink that represents the modeling of the entire electric arc furnace installation. This block diagram contains also the modeling of the electric arc which is the element that makes the electric arc furnace behaving as a nonlinear load. The values for the model parameters of the electric arc furnace installation are like the ones from the real installation taken into consideration. Other model parameters are the electric arc model ones. In order to study the influence of the parameters of the electric arc models, it is developed a Matlab program that contains the graphical user interfaces. These interfaces make connection with the models of the electric arc implemented in Simulink. The interfaces allow the user to modify parameters for each of the electric arc model. Current and voltage of the electric arc are the variables taken into account to study the influence of the parameters on the electric arc models. Waveforms for voltage and current of the electric arc are illustrated when a parameter of the model is modified in order to analyze the importance of this parameter on the electric arc model. Also, for each of the models is presented the voltage-current characteristic of the electric arc because this characteristic gives information about the behavior of the electric arc furnace installation.

  20. Personality, Career Satisfaction, and Life Satisfaction: Test of a Directional Model

    Science.gov (United States)

    Lounsbury, John W.; Park, Soo-Hee; Sundstrom, Eric; Williamson, Jeanine M.; Pemberton, Anne E.

    2004-01-01

    A conceptual model proposing paths from personality traits to career satisfaction and life satisfaction and from career satisfaction to life satisfaction was evaluated in a field study by structural equations modeling using LISREL 8. Participants were a convenience sample of 1,352 information science professionals. An exploratory maximum…

  1. Numerical modeling of volcanic arc development

    Science.gov (United States)

    Gerya, T.; Gorczyk, W.; Nikolaeva, K.

    2007-05-01

    We have created a new coupled geochemical-petrological-thermomechanical numerical model of subduction associated with volcanic arc development. The model includes spontaneous slab bending, subducted crust dehydration, aqueous fluid transport, mantle wedge melting and melt extraction resulting in crustal growth. Two major volcanic arc settings are modeled so far: active continental margins, and intraoceanic subduction. In case of Pacific-type continental margin two fundamentally different regimes of melt productivity are observed in numerical experiments which are in line with natural observations: (1) During continuous convergence with coupled plates highest amounts of melts are formed immediately after the initiation of subduction and then decrease rapidly with time due to the steepening of the slab inclination angle precluding formation of partially molten mantle wedge plumes; (2) During subduction associated with slab delamination and trench retreat resulting in the formation of a pronounced back arc basin with a spreading center in the middle melt production increases with time due to shallowing/stabilization of slab inclination associated with upward asthenospheric mantle flow toward the extension region facilitating propagation of hydrous partially molten plumes from the slab. In case of spontaneous nucleation of retreating oceanic subduction two scenarios of tecono-magmatic evolution are distinguished: (1) decay and, ultimately, the cessation of subduction and related magmatic activity, (2) increase in subduction rate (to up to ~12 cm/yr) and stabilization of subduction and magmatic arc growth. In the first case the duration of subduction correlates positively with the intensity of melt extraction: the period of continued subduction increases from 15,4 Myrs to 47,6 Myrs with the increase of melt extraction threshold from 1% to 9%. In scenario (1) the magmatic arc crust includes large amounts of rocks formed by melting of subducted crust atop the thermally

  2. ISLAMIC CARING MODEL ON INCREASE PATIENT SATISFACTION

    Directory of Open Access Journals (Sweden)

    Muh. Abdurrouf

    2017-04-01

    Full Text Available Introduction: Patient satisfaction was important aspect that must be considered by health service providers, patients who were not satisfied will leave the hospital and be a competitor's customers so be able caused a decrease in sales of products/services and in turn could reduce and even loss of profit, therefore, the hospital must provided the best service so that it could increase patient satisfaction. The purpose of this study was to exams the effect of Islamic caring model on increase patient satisfaction.. Method: This study was used pre-experimental design, the respondents were 31 patients in the treatment group assigned Islamic caring and 31 patients with a kontrol group that were not given Islamic caring Inpatient Surgical Sultan Agung Islamic Hospital Semarang by using consecutive sampling techniques, patient satisfaction data collected through questionnaires and analyzed with Mann-Whitney test, as for finding out the Islamic caring for patient satisfaction were analyzed with spearmen's rho test. Result: The results showed that there was a significant influence of Islamic caring for perceived disconfirmation (p=0,000 there was a perceived disconfirmation influence on patient satisfaction significantly (p=0,000, there was a significant influence of Islamic caring for patient satisfaction in the treatment group with a kontrol group (p=0.001. Discussion: Discussion of this study was Islamic caring model effect on the increase perceived disconfirmation and patient satisfaction, Perceived disconfirmation effect on patient satisfaction, patient satisfaction who given Islamic caring was increase, patients given Islamic caring had higher satisfaction levels than patients who not given Islamic caring. Suggestions put forward based on the results of the study of Islamic caring model could be applied in Sultan Agung Islamic Hospital as a model of nursing care, Islamic caring behavior can be learned and improved through training and commitment and

  3. Modeling of AC arc inside wet snow

    Energy Technology Data Exchange (ETDEWEB)

    Hemmatjou, H.

    2006-07-01

    Overhead transmission lines cover long distances over a broad range of topographic relief, climates, and environments. As such, the high voltage equipment is subject to pollution, wet snow and atmospheric icing. Each of these factors have been the source of power outages recorded on power transmission lines. Electric arcs can develop on outdoor insulators until they cause a total flashover. This study involved the modeling of flashover in snow-covered insulators to better understand how electric discharges initiate inside snow and how they develop into flashover. The main objective of this thesis was to develop a mathematical model to predict the flashover voltage of snow-covered insulator surfaces and to ultimately design adequate insulators for cold regions. The results obtained through mathematical modeling were in good agreement with those obtained in experiments.

  4. Sexual Satisfaction in Spanish Heterosexual Couples: Testing the Interpersonal Exchange Model of Sexual Satisfaction.

    Science.gov (United States)

    Sánchez-Fuentes, María del Mar; Santos-Iglesias, Pablo

    2016-01-01

    The study of sexual satisfaction in Spain is scarce and has proceeded atheoretically. This study aimed at examining sexual satisfaction in 197 Spanish heterosexual couples based on the Interpersonal Exchange Model of Sexual Satisfaction. Men and women reported equal satisfaction. Men's sexual satisfaction was predicted by their own relationship satisfaction, balance of sexual rewards and costs, and comparison level of sexual rewards and costs. Women's sexual satisfaction was predicted by their own relationship satisfaction, balance of sexual rewards and costs, comparison level of sexual rewards and costs, equality of sexual costs, and their partner's balance of sexual rewards and costs. These results provide with a better understanding of the mechanisms that explain sexual satisfaction in Spanish couples. Implications for research and therapy are discussed.

  5. Computational Modeling of Arc-Slag Interaction in DC Furnaces

    Science.gov (United States)

    Reynolds, Quinn G.

    2016-11-01

    The plasma arc is central to the operation of the direct-current arc furnace, a unit operation commonly used in high-temperature processing of both primary ores and recycled metals. The arc is a high-velocity, high-temperature jet of ionized gas created and sustained by interactions among the thermal, momentum, and electromagnetic fields resulting from the passage of electric current. In addition to being the primary source of thermal energy, the arc jet also couples mechanically with the bath of molten process material within the furnace, causing substantial splashing and stirring in the region in which it impinges. The arc's interaction with the molten bath inside the furnace is studied through use of a multiphase, multiphysics computational magnetohydrodynamic model developed in the OpenFOAM® framework. Results from the computational solver are compared with empirical correlations that account for arc-slag interaction effects.

  6. Computational Modeling of Arc-Slag Interaction in DC Furnaces

    Science.gov (United States)

    Reynolds, Quinn G.

    2017-02-01

    The plasma arc is central to the operation of the direct-current arc furnace, a unit operation commonly used in high-temperature processing of both primary ores and recycled metals. The arc is a high-velocity, high-temperature jet of ionized gas created and sustained by interactions among the thermal, momentum, and electromagnetic fields resulting from the passage of electric current. In addition to being the primary source of thermal energy, the arc jet also couples mechanically with the bath of molten process material within the furnace, causing substantial splashing and stirring in the region in which it impinges. The arc's interaction with the molten bath inside the furnace is studied through use of a multiphase, multiphysics computational magnetohydrodynamic model developed in the OpenFOAM® framework. Results from the computational solver are compared with empirical correlations that account for arc-slag interaction effects.

  7. Mathematical Modeling of Metal Active Gas (MAG) Arc Welding

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    In the present paper, a numerical model for MAG (metal active gas) arc welding of thin plate has been developed. In MAG arc welding, the electrode wire is melted and supplied into the molten pool intermittently. Accordingly, it is assumed on the modeling that the thermal energy enters the base-plates through two following mechanisms, i.e., direct heating from arc plasma and “indirect” heating from the deposited metal. In the second part of the paper, MAG arc welding process is numerically analyzed by using the model, and the calculated weld bead dimension and surface profile have been compared with the experimental MAG welds on steel plate. As the result, it is made clear that the model is capable of predicting the bead profile of thin-plate MAG arc welding , including weld bead with undercutting.

  8. Measuring Quality Satisfaction with Servqual Model

    Directory of Open Access Journals (Sweden)

    Dan Păuna

    2012-05-01

    Full Text Available The orientation to customer satisfaction is not a recent phenomenon, many very successfulbusinesspeople from the beginning of the 20th century, such as Sir Henry Royce, a name synonymous withRoll – Royce vehicles, stated the first principle regarding customer satisfaction “Our interest in the Roll-Royce cars does not end at the moment when the owner pays for and takes delivery the car. Our interest in thecar never wanes. Our ambition is that every purchaser of the Rolls - Royce car shall continue to be more thansatisfied (Rolls-Royce.” The following paper tries to deal with the important qualities of the concept for themeasuring of the gap between expected costumer services satisfactions, and perceived services like a routinecustomer feedback process, by means of a relatively new model, the Servqual model.

  9. Numerical modeling of transferred arc melting bath heating; Modelisation numerique du chauffage de bains par arc transfere

    Energy Technology Data Exchange (ETDEWEB)

    Bouvier, A. [Electricite de France, 77 - Moret sur Loing (France). Direction des Etudes et Recherches; Trenty, L.; Guillot, J.B. [Ecole Centrale de Paris, Laboratoire EM2C. CNRS, 92 - Chatenay-Malabry (France); Delalondre, C. [Electricite de France (EDF), 78 - Chatou (France). Direction des Etudes et Recherches

    1997-12-31

    This paper presents the modeling of a transferred electric arc inside a bath of melted metal. After a recall of the context of the study, the problem of the modeling, which involves magnetohydrodynamic coupling inside the arc and the bath, is described. The equations that govern the phenomena inside the arc and the bath are recalled and the approach used for the modeling of the anode region of the arc is explained using a 1-D sub-model. The conditions of connection between arc and bath calculations are explained and calculation results obtained with a 200 kW laboratory furnace geometry are presented. (J.S.) 8 refs.

  10. Critical Length Criterion and the Arc Chain Model for Calculating the Arcing Time of the Secondary Arc Related to AC Transmission Lines

    Science.gov (United States)

    Cong, Haoxi; Li, Qingmin; Xing, Jinyuan; Li, Jinsong; Chen, Qiang

    2015-06-01

    The prompt extinction of the secondary arc is critical to the single-phase reclosing of AC transmission lines, including half-wavelength power transmission lines. In this paper, a low-voltage physical experimental platform was established and the motion process of the secondary arc was recorded by a high-speed camera. It was found that the arcing time of the secondary arc rendered a close relationship with its arc length. Through the input and output power energy analysis of the secondary arc, a new critical length criterion for the arcing time was proposed. The arc chain model was then adopted to calculate the arcing time with both the traditional and the proposed critical length criteria, and the simulation results were compared with the experimental data. The study showed that the arcing time calculated from the new critical length criterion gave more accurate results, which can provide a reliable criterion in term of arcing time for modeling and simulation of the secondary arc related with power transmission lines. supported by National Natural Science Foundation of China (Nos. 51277061 and 51420105011)

  11. Fluid Flow Modeling of Arc Plasma and Bath Circulation in DC Electric Arc Furnace

    Institute of Scientific and Technical Information of China (English)

    WANG Feng-hua; JIN Zhi-jian; ZHU Zi-shu

    2006-01-01

    A mathematical model describing the flow field, heat transfer and the electromagnetic phenomenon in a DC electric arc furnace has been developed. First the governing equations in the arc plasma region are solved and the calculated results of heat transfer, current density and shear stresses on the anode surface are used as boundary conditions in a model of molten bath. Then a two-dimensional time-dependent model is used to describe the flow field and electromagnetic phenomenon in the molten bath. Moreover, the effect of bottom electrode diameter on the circulation of molten bath is studied.

  12. Predictors of Retirement Satisfaction: A Path Model.

    Science.gov (United States)

    Kremer, Yael

    1985-01-01

    Examined adjustment to retirement among 310 former industrial and service workers. Respondents had come to terms with retirement and enjoyed their more relaxed lifestyle. Dominant variables in the path model were retirees' satisfaction with specific aspects of retirement: giving up work, activities with family and friends, rest, and free time. (BH)

  13. Development of circuit model for arcing on solar panels

    Energy Technology Data Exchange (ETDEWEB)

    Mehta, Bhoomi K; Deshpande, S P; Mukherjee, S; Gupta, S B; Ranjan, M; Rane, R; Vaghela, N; Acharya, V [FCIPT, Institute for Plasma Research, Bhat, Gandhinagar 382428 (India); Sudhakar, M; Sankaran, M; Suresh, E P, E-mail: bhoomi@ipr.res.i [ISRO Satellite Centre (ISAC), Bangalore 560017 (India)

    2010-02-01

    The increased requirements of payload capacity of the satellites have resulted in much higher power requirements of the satellites. In order to minimize the energy loss during power transmission due to cable loss, use of high voltage solar panels becomes necessary. When a satellite encounters space plasma it floats negatively with respect to the surrounding space plasma environment. At high voltage, charging and discharging on solar panels causes the power system breakdown. Once a solar panel surface is charged and potential difference between surface insulator and conductor exceeds certain value, electrostatic discharge (ESD) may occur. This ESD may trigger a secondary arc that can destroy the solar panel circuit. ESD is also called as primary or minor arc and secondary is called major arc. The energy of minor arc is supplied by the charge stored in the coverglass of solar array and is a pulse of typically several 100 ns to several 100 {mu}s duration. The damage caused by minor arc is less compared to major arcs, but it is observed that the minor arc is cause of major arc. Therefore it is important to develop an understanding of minor arc and mitigation techniques. In this paper we present a linear circuit analysis for minor arcs on solar panels. To study arcing event, a ground experimental facility to simulate space plasma environment has been developed at Facilitation Centre for Industrial Plasma Technologies (Institute for Plasma Research) in collaboration with Indian Space Research Organization's ISRO Satellite Technology Centre (ISAC). A linear circuit model has been developed to explain the experimental results by representing the coverglass, solar cell interconnect and wiring by an LCR circuit and the primary arc by an equivalent LR circuit. The aim of the circuit analysis is to predict the arc current which flows through the arc plasma. It is established from the model that the current depends on various parameters like potential difference between

  14. Effect of cathode model on arc attachment for short high-intensity arc on a refractory cathode

    Science.gov (United States)

    Javidi Shirvan, Alireza; Choquet, Isabelle; Nilsson, Håkan

    2016-12-01

    Various models coupling the refractory cathode, the cathode sheath and the arc at atmospheric pressure exist. They assume a homogeneous cathode with a uniform physical state, and differ by the cathode layer and the plasma arc model. However even the most advanced of these models still fail in predicting the extent of the arc attachment when applied to short high-intensity arcs such as gas tungsten arcs. Cathodes operating in these conditions present a non-uniform physical state. A model taking into account the first level of this non-homogeneity is proposed based on physical criteria. Calculations are done for 5 mm argon arcs with a thoriated tungsten cathode. The results obtained show that radiative heating and cooling of the cathode surface are of the same order. They also show that cathode inhomogeneity has a significant effect on the arc attachment, the arc temperature and pressure. When changing the arc current (100 A, 200 A) the proposed model allows predicting trends observed experimentally that cannot be captured by the homogeneous cathode model unless restricting a priori the size of the arc attachment. The cathode physics is thus an important element to include to obtain a comprehensive and predictive arc model.

  15. Registered nurse job satisfaction and satisfaction with the professional practice model.

    Science.gov (United States)

    McGlynn, Karen; Griffin, Mary Quinn; Donahue, Moreen; Fitzpatrick, Joyce J

    2012-03-01

    This paper describes the initial assessment of job satisfaction and satisfaction with the professional practice environment of registered nurses working on units where a professional practice model was implemented and the relationship between these two variables. The nursing shortage has been linked to overall job satisfaction and specifically to nurses' satisfaction with the professional practice environment. Initiatives to increase retention and recruitment and decrease turnover have been linked to work satisfaction among nurses. A descriptive, cross-sectional design was used with participants (N = 101) from four patient care units; this represented a 55% response rate. The nurses were moderately satisfied with the professional practice environment but had overall low job satisfaction. There was a significant negative relationship between overall work satisfaction and satisfaction with the professional practice environment (P job satisfaction that were not being met. Thus, the nurses may have become more knowledgeable about the potential needs in these areas. Nurse managers and leaders must recognize that job satisfaction consists of many dimensions, and each of these dimensions is important to nurse retention. Implementation of a professional practice model may heighten awareness of the missing components within a practice environment and lead to decreased overall satisfaction. A broader understanding of characteristics associated with increased satisfaction may aid in development of organizational change necessary to retain and attract nurses. © 2012 Blackwell Publishing Ltd.

  16. Bermuda 1 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The 1 arc-second Bermuda DEM will be used to support NOAA's tsunami forecast system and for tsunami inundation modeling. This DEM encompasses the islands of Bermuda...

  17. British Columbia 3 arc-second Bathymetric Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The 3 arc-second British Columbia DEM will be used to support NOAA's tsunami forecast system and for tsunami inundation modeling. This DEM covers the coastal area...

  18. Bermuda 3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The 3 arc-second Bermuda DEM will be used to support NOAA's tsunami forecast system and for tsunami inundation modeling. This DEM encompasses the islands of Bermuda...

  19. Model construction of nursing service satisfaction in hospitalized tumor patients.

    Science.gov (United States)

    Chen, Yongyi; Liu, Jingshi; Xiao, Shuiyuan; Liu, Xiangyu; Tang, Xinhui; Zhou, Yujuan

    2014-01-01

    This study aims to construct a satisfaction model on nursing service in hospitalized tumor patients. Using questionnaires, data about hospitalized tumor patients' expectation, quality perception and satisfaction of hospital nursing service were obtained. A satisfaction model of nursing service in hospitalized tumor patients was established through empirical study and by structural equation method. This model was suitable for tumor specialized hospital, with reliability and validity. Patient satisfaction was significantly affected by quality perception and patient expectation. Patient satisfaction and patient loyalty was also affected by disease pressure. Hospital brand was positively correlated with patient satisfaction and patient loyalty, negatively correlated with patient complaint. Patient satisfaction was positively correlated with patient loyalty, patient complaints, and quality perception, and negatively correlated with disease pressure and patient expectation. The satisfaction model on nursing service in hospitalized tumor patients fits well. By this model, the quality of hospital nursing care may be improved.

  20. Non-Equilibrium Modeling of Arc Plasma Torches

    CERN Document Server

    Trelles, J P; Heberlein, J V R

    2013-01-01

    A two-temperature thermal non-equilibrium model is developed and applied to the three-dimensional and time-dependent simulation of the flow inside a DC arc plasma torch. A detailed comparison of the results of the non-equilibrium model with those of an equilibrium model is presented. The fluid and electromagnetic equations in both models are approximated numerically in a fully-coupled approach by a variational multi-scale finite element method. In contrast to the equilibrium model, the non-equilibrium model did not need a separate reattachment model to produce an arc reattachment process and to limit the magnitude of the total voltage drop and arc length. The non-equilibrium results show large non-equilibrium regions in the plasma - cold-flow interaction region and close to the anode surface. Marked differences in the arc dynamics, especially in the arc reattachment process, and in the magnitudes of the total voltage drop and outlet temperatures and velocities between the models are observed. The non-equilibr...

  1. Non-equilibrium modelling of arc plasma torches

    Energy Technology Data Exchange (ETDEWEB)

    Trelles, J P; Heberlein, J V R; Pfender, E [Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455 (United States)

    2007-10-07

    A two-temperature thermal non-equilibrium model is developed and applied to the three-dimensional and time-dependent simulation of the flow inside a dc arc plasma torch. A detailed comparison of the results of the non-equilibrium model with those of an equilibrium model is presented. The fluid and electromagnetic equations in both models are approximated numerically in a fully-coupled approach by a variational multi-scale finite element method. In contrast to the equilibrium model, the non-equilibrium model did not need a separate reattachment model to produce an arc reattachment process and to limit the magnitude of the total voltage drop and arc length. The non-equilibrium results show large non-equilibrium regions in the plasma-cold-flow interaction region and close to the anode surface. Marked differences in the arc dynamics, especially in the arc reattachment process, and in the magnitudes of the total voltage drop and outlet temperatures and velocities between the models are observed. The non-equilibrium results show improved agreement with experimental observations.

  2. Geometric model of robotic arc welding for automatic programming

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Geometric information is important for automatic programming of arc welding robot. Complete geometric models of robotic arc welding are established in this paper. In the geometric model of weld seam, an equation with seam length as its parameter is introduced to represent any weld seam. The method to determine discrete programming points on a weld seam is presented. In the geometric model of weld workpiece, three class primitives and CSG tree are used to describe weld workpiece. Detailed data structure is presented. In pose transformation of torch, world frame, torch frame and active frame are defined, and transformation between frames is presented. Based on these geometric models, an automatic programming software package for robotic arc welding, RAWCAD, is developed. Experiments show that the geometric models are practical and reliable.

  3. Modelling of the arc reattachment process in plasma torches

    Energy Technology Data Exchange (ETDEWEB)

    Trelles, J P; Pfender, E; Heberlein, J V R [Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455 (United States)

    2007-09-21

    The need to improve plasma spraying processes has motivated the development of computational models capable of describing the arc dynamics inside plasma torches. Although progress has been made in the development of such models, the realistic simulation of the arc reattachment process, a central part of the arc dynamics inside plasma torches, is still an unsolved problem. This study presents a reattachment model capable of mimicking the physical reattachment process as part of a local thermodynamic equilibrium description of the plasma flow. The fluid and electromagnetic equations describing the plasma flow are solved in a fully-coupled approach by a variational multi-scale finite element method, which implicitly accounts for the multi-scale nature of the flow. The effectiveness of our modelling approach is demonstrated by simulations of a commercial plasma spraying torch operating with Ar-He under different operating conditions. The model is able to match the experimentally measured peak frequencies of the voltage signal, arc lengths and anode spot sizes, but produces voltage drops exceeding those measured. This finding, added to the apparent lack of a well-defined cold boundary layer all around the arc, points towards the importance of non-equilibrium effects inside the torch, especially in the anode attachment region.

  4. A Study on Autonomous English Learning Strategies of Open Education Students Based on ARCS Motivation Model%基于 ARCS 动机模式的开放学员英语自主学习策略思考

    Institute of Scientific and Technical Information of China (English)

    印丽萍

    2012-01-01

      ARCS 动机模式理论对动机和自主学习能力的激励和保持有深远的影响。根据开放学员英语学习的具体情况,结合学习需求分析,以 ARCS 动机模式中的注意(Attention)、切身性(Relevance)、自信(confidence)以及满足感(Satisfaction)四要素为基础,对相应的动机和自主学习的激发和维持策略进行了初步探讨,发现开放学员英语自主学习能力可以通过 ARCS 这一理论得到有效的改善和提高。%  ARCS Model of Motivation has a profound effect on stimulating and keeping learning motivation and autonomous learn -ing.In view of the condition and learning needs of open education students , based on the four factors of ARCS theory , namely, attention, relevance, confidence and satisfaction, the study on the strategies of learning motivation and autonomous stimulating and keeping has been made, which reveals that the autonomous learning ability of open education students can be improved great -ly through ARCS theory.

  5. Heat transfer modeling of double-side arc welding

    CERN Document Server

    Sun Jun Sheng; Zhang Yan Ming

    2002-01-01

    If a plasma arc and a TIG arc are connected in serial and with the plasma arc placed on the obverse side and the TIG arc on the opposite side of the workpiece, a special double-side arc welding (DSAW) system will be formed, in which the PAW current is forced to flow through the keyhole along the thickness direction so as to compensate the energy consumed for melting the workpiece and improve the penetration capacity of the PAW arc. By considering the mechanics factors which influence the DSAW pool geometric shape, the control equations of the pool surface deformation are derived, and the mathematics mode for DSAW heat transfer is established by using boundary-fitted non-orthogonal coordinate systems. With this model, the difference between DSAW and PAW heat transfer is analyzed and the reason for the increase of DSAW penetration is explained from the point of heat transfer. The welding process experiments show that calculated results are in good agreement with measured ones

  6. Analysis of low energy arc discharge characteristics based on dynamic V-A characteristics model

    Institute of Scientific and Technical Information of China (English)

    JING Li-nan; WANG Li-gong

    2006-01-01

    Low energy arc discharge characteristics was analyzed based on dynamic V-A characteristics model. It draws conclusions that discharge time relates to the source voltage and the product of inductance and stable current, discharge time will increase when the source voltage increases; current reduce rate is in inverse proportion to the value of inductance; arc resistance when the arc occurs is the ratio of minimum arcing voltage to stable current. It also gains the expressions of arc resistance and arc power, arc resistance and arc power both increase as the source voltage increases and decrease as the value of inductance increases. Conclusions above mentioned are helpful to design intrinsically safe circuits.

  7. Model construction of nursing service satisfaction in hospitalized tumor patients

    OpenAIRE

    Chen, Yongyi; LIU, JINGSHI; Xiao, Shuiyuan; Liu, Xiangyu; Tang, Xinhui; Zhou, Yujuan

    2014-01-01

    This study aims to construct a satisfaction model on nursing service in hospitalized tumor patients. Using questionnaires, data about hospitalized tumor patients’ expectation, quality perception and satisfaction of hospital nursing service were obtained. A satisfaction model of nursing service in hospitalized tumor patients was established through empirical study and by structural equation method. This model was suitable for tumor specialized hospital, with reliability and validity. Patient s...

  8. Water-vortex stabilized electric arc: I. Numerical model

    Science.gov (United States)

    Jenista, Jirí

    1999-11-01

    A numerical model for an electric arc stabilized by a water vortex has been proposed. The two-dimensional axisymmetric model includes the discharge area between the cathode and the orifice of the arc chamber. The production of water plasma, i.e. the rate of evaporation of a water wall, is taken either from experiments or is determined numerically by fitting of the outlet plasma parameters to the experimental ones. The computer results concern thermal, fluid dynamic and electrical characteristics of such arcs for the currents 300, 400, 500 and 600 A. It is found, for example, that the role of thermal diffusion within the discharge increases with current. The power losses from the arc due to radial conduction and radiation represent around 50% of the input power. Rotation of the plasma column due to the induced tangential velocity component has negligible effect on the overall arc performance. The calculated velocities, pressure drops and electrical potentials are in good agreement with experiments carried out on the water plasma torch PAL-160 operating at our Institute.

  9. The modelling of an SF6 arc in a supersonic nozzle: II. Current zero behaviour of the nozzle arc

    Science.gov (United States)

    Zhang, Q.; Liu, J.; Yan, J. D.; Fang, M. T. C.

    2016-08-01

    The present work (part II) forms the second part of an investigation into the behaviour of SF6 nozzle arc. It is concerned with the aerodynamic and electrical behaviour of a transient nozzle arc under a current ramp specified by a rate of current decay (di/dt) before current zero and a voltage ramp (dV/dt) after current zero. The five flow models used in part I [1] for cold gas flow and DC nozzle arcs have been applied to study the transient arc at three stagnation pressures (P 0) and two values of di/dt for the current ramp, representing a wide range of arcing conditions. An analysis of the physical mechanisms encompassed in each flow model is given with an emphasis on the adequacy of a particular model in describing the rapidly varying arc around current zero. The critical rate of rise of recovery voltage (RRRV) is found computationally and compared with test results of Benenson et al [2]. For transient nozzle arcs, the RRRV is proportional to the square of P 0, rather than to the square root of P 0 for DC nozzle arcs. The physical mechanisms responsible for the strong dependence of RRRV on P 0 have been investigated. The relative merits of the flow models employed are discussed.

  10. Examining a Model of Life Satisfaction among Unemployed Adults

    Science.gov (United States)

    Duffy, Ryan D.; Bott, Elizabeth M.; Allan, Blake A.; Torrey, Carrie L.

    2013-01-01

    The present study examined a model of life satisfaction among a diverse sample of 184 adults who had been unemployed for an average of 10.60 months. Using the Lent (2004) model of life satisfaction as a framework, a model was tested with 5 hypothesized predictor variables: optimism, job search self-efficacy, job search support, job search…

  11. Computational Model Of Fiber Optic, Arc Fusion Splicing; Experimental Comparison

    Science.gov (United States)

    Ruffin, Paul; Frost, Walter; Long, Wayne

    1989-02-01

    Acknowledgement: The assistance and support of the MICOM Army Missile Command is gratefully appreciated. An analytical tool to investigate the arc fusion splicing of optical fibers is developed. The physical model incorporates heat transfer and thermal, visco elastic strain. The heat transfer equations governing radiation, conduction and convection during arc heating are formulated. The radiation heat flux impinging on the fiber optics is modeled based on reported experimental analysis of a generic type arc discharge. The fusion process considers deformation of the fiber due to thermal, viscous and elastic strain. A Maxwell stress-strain relationship is assumed. The model assumes an initial gap at the beginning of the arc which is closed by a press-stroke during the heating cycle. All physical properties of the fused silica glass fibers are considered as functions of temperature based on available experimental data. A computer algorithm has been developed to solve the system of governing equations and parametric studies carried out. An experiment using a FSM-20 arc fusion splicer manufactured by Fujikura Ltd. was carried out to provide experimental verification of the analytical model. In the experiment a continuous fiber was positioned in the arc and cyclic heating and cooling was carried out. One end of the fiber was clamped and the other was free to move. The fiber was heated for 6 seconds and cooled for 3 minutes for several cycles. At the end of each cooling process, photographs of the deformation of the fiber were taken. The results showed that the fiber necked down on the free end and buldged up on the fixed end. With repeated heating and cooling cycles, the optical fiber eventually necked down to the point that it melted in two. The analytical model was run for the conditions of the experiment. Comparisons of the predicted deformation of the optical fiber with those measured is given. The analytical model displays all of the physical phenomenon of fiber

  12. Modeling of Fume Formation from Shielded Metal Arc Welding Process

    Science.gov (United States)

    Sivapirakasam, S. P.; Mohan, Sreejith; Santhosh Kumar, M. C.; Surianarayanan, M.

    2017-04-01

    In this study, a semi-empirical model of fume formation rate (FFR) from a shielded metal arc welding (SMAW) process has been developed. The model was developed for a DC electrode positive (DCEP) operation and involves the calculations of droplet temperature, surface area of the droplet, and partial vapor pressures of the constituents of the droplet to predict the FFR. The model was further extended for predicting FFR from nano-coated electrodes. The model estimates the FFR for Fe and Mn assuming constant proportion of other elements in the electrode. Fe FFR was overestimated, while Mn FFR was underestimated. The contribution of spatters and other mechanism in the arc responsible for fume formation were neglected. A good positive correlation was obtained between the predicted and experimental FFR values which highlighted the usefulness of the model.

  13. Modeling of Fume Formation from Shielded Metal Arc Welding Process

    Science.gov (United States)

    Sivapirakasam, S. P.; Mohan, Sreejith; Santhosh Kumar, M. C.; Surianarayanan, M.

    2017-01-01

    In this study, a semi-empirical model of fume formation rate (FFR) from a shielded metal arc welding (SMAW) process has been developed. The model was developed for a DC electrode positive (DCEP) operation and involves the calculations of droplet temperature, surface area of the droplet, and partial vapor pressures of the constituents of the droplet to predict the FFR. The model was further extended for predicting FFR from nano-coated electrodes. The model estimates the FFR for Fe and Mn assuming constant proportion of other elements in the electrode. Fe FFR was overestimated, while Mn FFR was underestimated. The contribution of spatters and other mechanism in the arc responsible for fume formation were neglected. A good positive correlation was obtained between the predicted and experimental FFR values which highlighted the usefulness of the model.

  14. Predicting life satisfaction of the Angolan elderly: a structural model.

    Science.gov (United States)

    Gutiérrez, M; Tomás, J M; Galiana, L; Sancho, P; Cebrià, M A

    2013-01-01

    Satisfaction with life is of particular interest in the study of old age well-being because it has arisen as an important component of old age. A considerable amount of research has been done to explain life satisfaction in the elderly, and there is growing empirical evidence on best predictors of life satisfaction. This research evaluates the predictive power of some aging process variables, on Angolan elderly people's life satisfaction, while including perceived health into the model. Data for this research come from a cross-sectional survey of elderly people living in the capital of Angola, Luanda. A total of 1003 Angolan elderly were surveyed on socio-demographic information, perceived health, active engagement, generativity, and life satisfaction. A Multiple Indicators Multiple Causes model was built to test variables' predictive power on life satisfaction. The estimated theoretical model fitted the data well. The main predictors were those related to active engagement with others. Perceived health also had a significant and positive effect on life satisfaction. Several processes together may predict life satisfaction in the elderly population of Angola, and the variance accounted for it is large enough to be considered relevant. The key factor associated to life satisfaction seems to be active engagement with others.

  15. The Next Generation ARC Middleware and ATLAS Computing Model

    CERN Document Server

    Filipcic, A; The ATLAS collaboration; Smirnova, O; Konstantinov, A; Karpenko, D

    2012-01-01

    The distributed NDGF Tier-1 and associated Nordugrid clusters are well integrated into the ATLAS computing model but follow a slightly different paradigm than other ATLAS resources. The current strategy does not divide the sites as in the commonly used hierarchical model, but rather treats them as a single storage endpoint and a pool of distributed computing nodes. The next generation ARC middleware with its several new technologies provides new possibilities in development of the ATLAS computing model, such as pilot jobs with pre-cached input files, automatic job migration between the sites, integration of remote sites without connected storage elements, and automatic brokering for jobs with non-standard resource requirements. ARC's data transfer model provides an automatic way for the computing sites to participate in ATLAS' global task management system without requiring centralised brokering or data transfer services. The powerful API combined with Python and Java bindings can easily be used to build new ...

  16. PICTORIAL RIDDLE MELALUI PEMBELAJARAN ATTENTION, RELEVANCE, CONFIDENCE, SATISFACTION (ARCS UNTUK MENINGKATKAN KEMAMPUAN PEMECAHAN MASALAH DAN MOTIVASI BERPRESTASI SISWA

    Directory of Open Access Journals (Sweden)

    Siti Masfuah

    2016-08-01

    Full Text Available Penelitian ini bertujuan mengetahui penerapan metode pictorial riddle melalui pembelajaran ARCS untuk meningkatkan kemampuan pemecahan masalah dan motivasi berprestasi siswa. Metode pictorial riddle yang digunakan adalah jenis komik sains sederhana yang berisi tentang cerita petualangan yang dihubungkan dengan materi sains. Penelitian ini merupakan penelitian pra eksperimen dengan desain one shot case study karena tidak ada kelas kontrol. Subyek penelitian ini adalah siswa kelas V SD Negeri 4 Rendeng Kudus yang dipilih dengan teknik purposive sampling. Variabel bebas penelitian ini adalah metode pictorial riddle dengan jenis komik sains yang diterapkan pada model pembelajaran ARCS, sedangkan variabel terikatnya adalah kemampuan pemecahan masalah dan motivasi berprestasi siswa. Teknik analisis data yang digunakan adalah uji t satu sampel yang dibandingkan nilai KKM. Berdasarkan analisis data diketahui bahwa rata-rata kemampuan pemecahan masalah siswa sebesar 82,75, sedangkan rata-rata motivasi berprestasi siswa sebesar 80,31. Berdasarkan pengujian hipotesis, rata-rata kemampuan pemecahan masalah dan motivasi berprestasi siswa kelas V SD Negeri 4 Rendeng lebih dari atau sama dengan 75. Dengan demikian, dapat disimpulkan bahwa metode pictorial riddle melalui pembelajaran ARCS dapat meningkatkan kemampuan pemecahan masalah dan motivasi berprestasi siswa.

  17. A customer satisfaction model for a utility service industry

    Science.gov (United States)

    Jamil, Jastini Mohd; Nawawi, Mohd Kamal Mohd; Ramli, Razamin

    2016-08-01

    This paper explores the effect of Image, Customer Expectation, Perceived Quality and Perceived Value on Customer Satisfaction, and to investigate the effect of Image and Customer Satisfaction on Customer Loyalty of mobile phone provider in Malaysia. The result of this research is based on data gathered online from international students in one of the public university in Malaysia. Partial Least Squares Structural Equation Modeling (PLS-SEM) has been used to analyze the data that have been collected from the international students' perceptions. The results found that Image and Perceived Quality have significant impact on Customer Satisfaction. Image and Customer Satisfaction ware also found to have significantly related to Customer Loyalty. However, no significant impact has been found between Customer Expectation with Customer Satisfaction, Perceived Value with Customer Satisfaction, and Customer Expectation with Perceived Value. We hope that the findings may assist the mobile phone provider in production and promotion of their services.

  18. Employee important-satisfaction model for automotive industry

    Science.gov (United States)

    Aziz, Nazrina; Mahat, Nor Idayu; Omar, Zurni

    2014-12-01

    There are many available strategies to measure employee satisfaction. Among the common strategies are employee responses to supervisors during routine meetings or periodic assessments of performance, number of complaints and feedback from employees. Although the management of the company may expect what its employees are most satisfied with, they may not know what is important to their employees' satisfaction. The "satisfaction attributes" and the "importance attributes" are related components that worth to be taken into account. Besides, the management needs to identify what their employees' priorities are, otherwise the management could be wasting their limited energy and resources tackling wrong attributes. In this study the Important-Satisfaction model is proposed. The model is based on the importance and satisfaction score of the attributes where the score for each attribute is placed in the model. It assists the management in identifying attributes that require improvement and provide an excellent measuring instrument for assessing priorities for attribute improvement.

  19. Probabilistic verification of Architectural software models using SoftArc and Prism

    NARCIS (Netherlands)

    Haverkort, Boudewijn R.H.M.; Kuntz, G.W.M.; Leitner-Fischer, F.; Remke, Anne Katharina Ingrid; Roolvink, S.

    2010-01-01

    In this paper we will describe the SoftArc approach. With the SoftArc approach it is possible to model and analyse safety-critical embedded and distributed systems that consist of both hard- and software. We are going to present the SoftArc modelling language, its syntax and semantics. The semantics

  20. Construct Method of Predicting Satisfaction Model Based on Technical Characteristics

    Institute of Scientific and Technical Information of China (English)

    YANG Xiao-an; DENG Qian; SUN Guan-long; ZHANG Wei-she

    2011-01-01

    In order to construct objective relatively mapping relationship model between customer requirements and product technical characteristics, a novel approach based on customer satisfactions information digging from case products and satisfaction information of expert technical characteristics was put forward in this paper. Technical characteristics evaluation values were expressed by rough number, and technical characteristics target sequence was determined on the basis of efficiency, cost type and middle type in this method. Use each calculated satisfactions of customers and technical characteristics as input and output elements to construct BP network model. And we use MATLAB software to simulate this BP network model based on the case of electric bicycles.

  1. Application of Steenbeck's minimum principle for three-dimensional modelling of DC arc plasma torches

    CERN Document Server

    Li He Ping; Chen, X

    2003-01-01

    In this paper, physical/mathematical models for the three-dimensional, quasi-steady modelling of the plasma flow and heat transfer inside a non-transferred DC arc plasma torch are described in detail. The Steenbeck's minimum principle (Finkelnburg W and Maecker H 1956 Electric arcs and thermal plasmas Encyclopedia of Physics vol XXII (Berlin: Springer)) is employed to determine the axial position of the anode arc-root at the anode surface. This principle postulates a minimum arc voltage for a given arc current, working gas flow rate, and torch configuration. The modelling results show that the temperature and flow fields inside the DC non-transferred arc plasma torch show significant three-dimensional features. The predicted anode arc-root attachment position and the arc shape by employing Steenbeck's minimum principle are reasonably consistent with experimental observations. The thermal efficiency and the torch power distribution are also calculated in this paper. The results show that the thermal efficiency...

  2. Student Satisfaction with Canadian Music Programmes: The Application of the American Customer Satisfaction Model in Higher Education

    Science.gov (United States)

    Serenko, Alexander

    2011-01-01

    The purpose of this project is to empirically investigate several antecedents and consequences of student satisfaction (SS) with Canadian university music programmes as well as to measure students' level of programme satisfaction. For this, the American Customer Satisfaction Model was tested through a survey of 276 current Canadian music students.…

  3. Student Satisfaction with Canadian Music Programmes: The Application of the American Customer Satisfaction Model in Higher Education

    Science.gov (United States)

    Serenko, Alexander

    2011-01-01

    The purpose of this project is to empirically investigate several antecedents and consequences of student satisfaction (SS) with Canadian university music programmes as well as to measure students' level of programme satisfaction. For this, the American Customer Satisfaction Model was tested through a survey of 276 current Canadian music students.…

  4. The impact of treatment couch modelling on RapidArc

    Energy Technology Data Exchange (ETDEWEB)

    Vanetti, Eugenio; Nicolini, Giorgia; Clivio, Alessandro; Fogliata, Antonella; Cozzi, Luca [Medical Physics Unit, Oncology Institute of Southern Switzerland, Bellinzona (Switzerland)], E-mail: lucozzi@iosi.ch

    2009-05-07

    A planning and dosimetric study was carried out on a cohort of six CT datasets from patients treated for prostate cancer to assess the impact of couch modelling on the accuracy of dose calculation for the volumetric modulated arc technique RapidArc. For each patient, RapidArc plans were optimized using the couch while final dose calculation was performed with different conditions (thin, medium, thick and no couch). Analysis was performed in terms of dose volume histograms, dose difference histograms and 3D-{gamma} tests. Pre-treatment verification measurements were performed using the PTW-729 array in conjunction with the Octavius phantom (PTW, Freiburg); similarly, HU characterization of couch was performed with the same phantom and ion chamber measurements comparing calculations and experimental data. A set of Hounsfield Units (HU) valid for low and high energy and the entire couch length was found as internal structure HU = -960, surface shell HU = -700. Analysis of dose plans showed that differences larger than 1.5 Gy for a 70 Gy prescription might be observed on significant fractions of PTVs. Smaller differences are visible in the medium low-dose regions. Pre-treatment verification on composite delivery confirmed these observations and, at the same time, showed good accuracy of dose calculations in the presence of couch modelling compared to delivery in the same conditions (GAI ranging from 95% to 100%). Results confirmed the reliability of the geometrical model build in the planning system Eclipse, and (i) there is no measurable effect if the wrong segment of the couch is used in the calculations; (ii) there are significant discrepancies of potential clinical impact at the level of the target volumes if calculations are performed without couch and delivery is performed with couch, and (iii) the effect is particularly relevant at low energy (6 MV in this case) that is the configuration clinically used by most of the centres adopting technologies based on

  5. The impact of treatment couch modelling on RapidArc.

    Science.gov (United States)

    Vanetti, Eugenio; Nicolini, Giorgia; Clivio, Alessandro; Fogliata, Antonella; Cozzi, Luca

    2009-05-07

    A planning and dosimetric study was carried out on a cohort of six CT datasets from patients treated for prostate cancer to assess the impact of couch modelling on the accuracy of dose calculation for the volumetric modulated arc technique RapidArc. For each patient, RapidArc plans were optimized using the couch while final dose calculation was performed with different conditions (thin, medium, thick and no couch). Analysis was performed in terms of dose volume histograms, dose difference histograms and 3D-gamma tests. Pre-treatment verification measurements were performed using the PTW-729 array in conjunction with the Octavius phantom (PTW, Freiburg); similarly, HU characterization of couch was performed with the same phantom and ion chamber measurements comparing calculations and experimental data. A set of Hounsfield Units (HU) valid for low and high energy and the entire couch length was found as internal structure HU = -960, surface shell HU = -700. Analysis of dose plans showed that differences larger than 1.5 Gy for a 70 Gy prescription might be observed on significant fractions of PTVs. Smaller differences are visible in the medium low-dose regions. Pre-treatment verification on composite delivery confirmed these observations and, at the same time, showed good accuracy of dose calculations in the presence of couch modelling compared to delivery in the same conditions (GAI ranging from 95% to 100%). Results confirmed the reliability of the geometrical model build in the planning system Eclipse, and (i) there is no measurable effect if the wrong segment of the couch is used in the calculations; (ii) there are significant discrepancies of potential clinical impact at the level of the target volumes if calculations are performed without couch and delivery is performed with couch, and (iii) the effect is particularly relevant at low energy (6 MV in this case) that is the configuration clinically used by most of the centres adopting technologies based on

  6. An Examination of Need-Satisfaction Models of Job Attitudes

    Science.gov (United States)

    Salancik, Gerald R.; Pfeffer, Jeffrey

    1977-01-01

    An examination of need-satisfaction models indicates that they are frequently formulated so as to be almost impossible to refute, and the research testing them has been beset with consistency and priming artifacts. (Author/IRT)

  7. A Model for Employee Motivation and Satisfaction.

    Science.gov (United States)

    Grant, Philip C.

    1979-01-01

    To increase an employee's motivation, an employee must perceive that s/he will achieve higher satisfaction for greater effort. To generate such perception, rewards must clearly be contingent on effort and the cost of increased effort must grow at a slower rate than the increase in reward. (Author/IRT)

  8. Modelling the Plasma Jet in Multi-Arc Plasma Spraying

    Science.gov (United States)

    Bobzin, K.; Öte, M.; Schein, J.; Zimmermann, S.; Möhwald, K.; Lummer, C.

    2016-08-01

    Particle in-flight characteristics in atmospheric plasma spraying process are determined by impulse and heat energy transferred between the plasma jet and injected powder particles. One of the important factors for the quality of the plasma-sprayed coatings is thus the distribution of plasma gas temperatures and velocities in plasma jet. Plasma jets generated by conventional single-arc plasma spraying systems and their interaction with powder particles were subject matter of intensive research. However, this does not apply to plasma jets generated by means of multi-arc plasma spraying systems yet. In this study, a numerical model has been developed which is designated to dealing with the flow characteristics of the plasma jet generated by means of a three-cathode spraying system. The upstream flow conditions, which were calculated using a priori conducted plasma generator simulations, have been coupled to the plasma jet simulations. The significances of the relevant numerical assumptions and aspects of the models are analyzed. The focus is placed on to the turbulence and diffusion/demixing modelling. A critical evaluation of the prediction power of the models is conducted by comparing the numerical results to the experimental results determined by means of emission spectroscopic computed tomography. It is evident that the numerical models exhibit a good accuracy for their intended use.

  9. Evaluation of consumer satisfaction using the tetra-class model.

    Science.gov (United States)

    Clerfeuille, Fabrice; Poubanne, Yannick; Vakrilova, Milena; Petrova, Guenka

    2008-09-01

    A number of studies have shown the importance of consumers' satisfaction toward pharmacy services. The measurement of patient satisfaction through different elements of services provided is challenging within the context of a dynamic economic environment. Patient satisfaction is the result of long-term established habits and expectations to the pharmacy as an institution. Few studies to date have attempted to discern whether these changes have led to increased patient satisfaction and loyalty, particularly within developing nations. The objective of this study was to evaluate the elements of the services provided in Bulgarian pharmacies and their contribution to consumer satisfaction using a tetra-class model. Three main hypotheses were tested in pharmacies to validate the model in the case of complex services. Additionally, the contribution of the different service elements to the clients' satisfaction was studied. The analysis was based on a survey of customers in central and district pharmacies in Sofia, Bulgaria. The data were analyzed through a correspondence analysis which was applied to the results of the 752 distributed questionnaires. It was observed that different dimensions of the pharmacies contribute uniquely to customer satisfaction, with consumer gender contributing greatly toward satisfaction, with type/location of pharmacy, consumer age, and educational degree also playing a part. The duration of time over which the consumers have been clients at a given pharmacy influences the subsequent service categorization. This research demonstrated that the tetra-class model is suitable for application in the pharmaceutical sector. The model results could be beneficial for both researchers and pharmacy managers.

  10. Modeling Vacuum Arcs On Spacecraft Solar Panel Arrays Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Spacecraft charging and subsequent vacuum arcing poses a significant threat to satellites in LEO and GEO plasma conditions. Localized arc discharges can cause a...

  11. A comparative study of modelling AC electric arc by one-dimensional interpolation for power system harmonics analysis

    OpenAIRE

    Liu Yu-Jen; Hung Jen-Pan; Chen Shang-I; Lin Cheng-Wei

    2016-01-01

    Electric arc is a discharge phenomenon caused by particular electrical events and arc produced facilities in power system, for example the occurrence of short-circuit fault in feeders and the use of electric arc furnace for steel-making. All of these electric arcs have a highly nonlinear nature and can be considered as a significant source of power quality problems. To investigate the impacts of the electric arcs on power quality studies the development of the electric arc models for simulati...

  12. Correction factor based double model fuzzy logic control strategy of arc voltage in pulsed MIG welding

    Institute of Scientific and Technical Information of China (English)

    Wu Kaiyuan; Huang Shisheng; Meng Yongmin

    2005-01-01

    According to the feature of arc voltage control in welding steel using pulsed MIG welding, a correction factor based double model fuzzy logic controller (FLC) was developed to realize the arc voltage control by means of arc voltage feedback.When the error of peak arc voltage was great, a coarse adjusting fuzzy logic control rules with correction factor was designed,in the controller, the peak arc voltage was controlled by the wire feeding speed by means of arc voltage feedback. When the error of peak arc voltage was small, a fine adjusting fuzzy logic control rules with correction factor was designed, in this controller, the peak arc voltage was controlled by the background time by means of arc voltage feedback. The FLC was realized in a Look-Up Table ( LUT) method. Experiments had been carried out aiming at implementing the control strategy to control the arc length change in welding process. Experimental results show that the controller proposed enables the consistency of arc length and the stabolity of arc voltage and welding process to be achieved in pulsed MIG welding process.

  13. Review on research progress of Arc Hydro and Arc Hydro Groundwater hydrological data model%Arc Hydro与Arc Hydro Groundwater水文数据模型研究综述

    Institute of Scientific and Technical Information of China (English)

    崔素芳; 张保祥; 崔峻岭; 潘英华; 张振华; 吴泉源; 衣华鹏

    2016-01-01

    由于目前在地表水与地下水的联合模拟研究中备受青睐的Arc Hydro与Arc Hydro Groundwater水文数据模型能否应用于水文模拟尚缺少实证性研究,通过查阅大量文献资料,分析这两个水文数据模型的功能和优点,以及存在的问题和未来发展趋势。指出Arc Hydro模型虽然具备强大的水文分析与提取功能,但其本身并不能实现水文模拟,必须与独立的水文模型利用数据交换来完成水文模拟;Arc Hydro Groundwater模型虽然包含MODFLOW分析模型,但只能对MODFLOW模型输出的结果进行可视化处理,目前还不具备独立的地下水模拟功能。认为地表水与地下水联合模型与GIS耦合集成平台的开发将是未来研究的热点。%Arc Hydro and Arc Hydro Groundwater hydrological data model are favored by scholars in the joint simulation of surface water and groundwater, but empirical researches on whether hydrological simulation can apply Arc Hydro and Arc Hydro Groundwater model are lack. According to this problem, the functions and advantages of these two hydrological models were analyzed, furthermore, the remaining problems and the development trend were also discussed by a review of a large number of documents. It is pointed out that although Arc Hydro has function of strong hydrological analysis and extraction, this model cannot realize hydrological simulation, data exchange is necessary to complete hydrological simulation with independent hydrological model. Arc Hydro Groundwater contains MODFLOW analysis model, however, it only can visualize process for MODFLOW model outputs and does not yet have independent groundwater simulation function. The development of integrated platform combining joint simulation model of surface water and groundwater with GIS coupling is supposed to be a hot research.

  14. A hybrid simulation model for a stable auroral arc

    Directory of Open Access Journals (Sweden)

    P. Janhunen

    Full Text Available We present a new type of hybrid simulation model, intended to simulate a single stable auroral arc in the latitude/altitude plane. The ionospheric ions are treated as particles, the electrons are assumed to follow a Boltzmann response and the magnetospheric ions are assumed to be so hot that they form a background population unaffected by the electric fields that arise. The system is driven by assumed parallel electron energisation causing a primary negative charge cloud and an associated potential structure to build up. The results show how a closed potential structure and density depletion of an auroral arc build up and how they decay after the driver is turned off. The model also produces upgoing energetic ion beams and predicts strong static perpendicular electric fields to be found in a relatively narrow altitude range (~ 5000–11 000 km.

    Key words. Magnetospheric physics (magnetosphere-ionosphere interactions; auroral phenomena – Space plasma physics (numerical simulation studies

  15. 3D cartographic modeling of the Alpine arc

    Science.gov (United States)

    Vouillamoz, Naomi; Sue, Christian; Champagnac, Jean-Daniel; Calcagno, Philippe

    2012-12-01

    We built a 3D cartography of the Alpine arc, a highly non-cylindrical mountain belt, using the 3D GeoModeller of the BRGM (French geological survey). The model allows to handle the large-scale 3D structure of seventeen major crustal units of the belt (from the lower crust to the sedimentary cover nappes), and two main discontinuities (the Insubric Line and the Crustal Penninic Front). It provides a unique document to better understand their structural relationships and to produce new sections. The study area comprises the western Alpine arc, from the Jura to the Northwest, up to the Bergell granite intrusion and the Lepontine Dome to the East, and is limited to the South by the Ligurian basin. The model is limited vertically 10 km above sea level at the top, and the moho interface at the bottom. We discarded the structural relationships between the Alps sensus stricto and the surrounding geodynamic systems such as the Rhine graben or the connection with the Apennines. The 3D-model is based on the global integration of various data such as the DEM of the Alps, the moho isobaths, the simplified geological and tectonic maps of the belt, the crustal cross-sections ECORS-CROP and NFP-20, and complementary cross-sections specifically built to precise local complexities. The database has first been integrated in a GIS-project to prepare their implementation in the GeoModeller, by homogenizing the different spatial referencing systems. The global model is finally interpolated from all these data, using the potential field method. The final document is a new tri-dimensional cartography that would be used as input for further alpine studies.

  16. Occupants' satisfaction toward building environmental quality: structural equation modeling approach.

    Science.gov (United States)

    Kamaruzzaman, Syahrul Nizam; Egbu, C O; Zawawi, Emma Marinie Ahmad; Karim, Saipol Bari Abd; Woon, Chen Jia

    2015-05-01

    It is accepted that occupants who are more satisfied with their workplace's building internal environment are more productive. The main objective of the study was to measure the occupants' level of satisfaction and the perceived importance of the design or refurbishment on office conditions. The study also attempted to determine the factors affecting the occupants' satisfaction with their building or office conditions. Post-occupancy evaluations were conducted using a structured questionnaire developed by the Built Environment Research Group at the University of Manchester, UK. Our questionnaires incorporate 22 factors relating to the internal environment and rate these in terms of "user satisfaction" and "degree of importance." The questions were modified to reflect the specific setting of the study and take into consideration the local conditions and climate in Malaysia. The overall mean satisfaction of the occupants toward their office environment was 5.35. The results were measured by a single item of overall liking of office conditions in general. Occupants were more satisfied with their state of health in the workplace, but they were extremely dissatisfied with the distance away from a window. The factor analysis divided the variables into three groups, namely intrusion, air quality, and office appearance. Structural equation modeling (SEM) was then used to determine which factor had the most significant influence on occupants' satisfaction: appearance. The findings from the study suggest that continuous improvement in aspects of the building's appearance needs to be supported with effective and comprehensive maintenance to sustain the occupants' satisfaction.

  17. Modeling cast IN-738 superalloy gas tungsten arc welds

    Energy Technology Data Exchange (ETDEWEB)

    Bonifaz, E.A. [Department of Mechanical and Manufacturing Engineering, University of Manitoba, E2-327F EITC, Winnipeg, Man., R3T 5V6 (Canada); Universidad San Francisco de Quito, Casilla Postal: 17-12-841 Circulo de Cumbaya, Quito (Ecuador)], E-mail: bonifaz@cc.umanitoba.ca; Richards, N.L. [Department of Mechanical and Manufacturing Engineering, University of Manitoba, E2-327F EITC, Winnipeg, Man., R3T 5V6 (Canada)], E-mail: nrichar@cc.umanitoba.ca

    2009-04-15

    A three-dimensional finite-element thermal model has been developed to generate weld profiles, and to analyze transient heat flow, thermal gradients and thermal cycles in cast IN-738 superalloy gas tungsten arc welds. Outputs of the model (cooling rates, the thermal gradient G and the growth rate R) were used to describe solidification structures found around the weld pool for three different welding speeds at constant heat input. Calculations around the weld pool indicate that the cooling rate increases from the fusion line to the centerline at all welding speeds. It was also observed that the cooling rate (G x R) and the ratio G/R fall with welding speed. For instance, as the welding speed is increased, the cooling rates at the centerline, fusion line and penetration depth decrease. Moreover, it was observed that as the power and welding speed both increase (but keeping the heat input constant), the weld pool becomes wider and more elongated, shifting from circular to elliptical shaped. The calculations were performed using ABAQUS FE code on the basis of a time-increment Lagrangian formulation. The heat source represented by a moving Gaussian power density distribution is applied over the top surface of the specimen during a period of time that depends on the welding speed. Temperature-dependent material properties and the effect of forced convection due to the flow of the shielding gas are included in the model. Numerically predicted sizes of the melt-pool zone and dendrite secondary arm spacing induced by the gas tungsten arc welding process are also given.

  18. Wage Equity and Female Job Satisfaction: The Role of Wage Differentials in a Job Satisfaction Causal Model.

    Science.gov (United States)

    Hagedorn, Linda Serra

    1996-01-01

    Using data from a national survey of faculty, a study examined the role of male/female wage differentials in a model of job satisfaction for full-time female faculty. Results indicated that as gender-based wage differentials increased, females' global job satisfaction decreased, with the effect mainly in faculty perceptions of the institution.…

  19. The Divergent Meanings of Life Satisfaction: Item Response Modeling of the Satisfaction with Life Scale in Greenland and Norway

    Science.gov (United States)

    Vitterso, Joar; Biswas-Diener, Robert; Diener, Ed

    2005-01-01

    Cultural differences in response to the Satisfaction With Life Scale (SWLS) items is investigated. Data were fit to a mixed Rasch model in order to identify latent classes of participants in a combined sample of Norwegians (N = 461) and Greenlanders (N = 180). Initial analyses showed no mean difference in life satisfaction between the two…

  20. Seismotectonics of New Guinea: a Model for Arc Reversal Following Arc-Continent Collision

    Science.gov (United States)

    Cooper, Patricia; Taylor, Brian

    1987-02-01

    The structure and evolution of the northern New Guinea collision zone is deduced from International Seismological Center (ISC) seismicity (1964-1985), new and previously published focal mechanisms and a reexamination of pertinent geological data. A tectonic model for the New Guinea margin is derived which illustrates the sequential stages in the collision and suturing of the Bewani-Toricelli-Adelbert-Finisterre-Huon-New Britain arc to central New Guinea followed by subduction polarity reversal in the west. East of 149°E, the Solomon plate is being subducted both to the north and south; bringing the New Britain and Trobriand forearcs toward collision. West of 149°E the forearcs have collided, and together they override a fold in the doubly subducted Solomon plate lithosphere, which has an axis that is parallel to the strike of the Ramu-Markham suture and that plunges westward at an angle of 5° beneath the coast ranges of northern New Guinea. Active volcanism off the north coast of New Guinea is related to subduction of the Solomon plate beneath the Bismarck plate. Active volcanism of the Papuan peninsula and Quaternary volcanism of the New Guinea highlands are related to slow subduction of the Solomon plate beneath the Indo-Australian plate along the Trobriand Trough and the trough's former extension to the west, respectively. From 144°-148°E, seismicity and focal mechanisms reveal that convergence between the sutured Bismarck and Indo-Australian plates is accommodated by thrusting within the Finisterre and Adelbert ranges and compression of the New Guinea orogenic belt, together with basement-involved foreland folding and thrusting to the south. The Finisterre block overthrusts the New Guinea orogenic belt, whereas the Adelbert block is sutured to New Guinea and overthrusts the oceanic lithosphere of the Bismarck Sea. Along the New Guinea Trench, west of 144°E, seismicity defines a southward dipping Wadati-Benioif zone, and focal mechanisms indicate oblique

  1. Connecting customers’ satisfaction to sustainable development. A Marketing models perspective

    Directory of Open Access Journals (Sweden)

    Ioan Constantin ENACHE

    2015-12-01

    Full Text Available The increase information quantity and availability has generated transformations in customer behaviour, by having almost immediately access to huge amounts of data the customers’ process of buying a product or service is using more information regarding the product characteristics. This situation generates changes on each step of buying process. The customer satisfaction is harder to reach and the sustainable development of a marketing strategy needs to take into consideration more factors. The article aims at providing new information on customer satisfaction and sustainable development by using a marketing models framework.

  2. Modeling satisfaction amongst the elderly in different Chinese urban neighborhoods.

    Science.gov (United States)

    Yan, Bingqiu; Gao, Xiaolu; Lyon, Michael

    2014-10-01

    Rapidly aging populations constitute a critical issue for researchers and policymakers across the world; the challenges of a shifting demographic structure are particularly pertinent in the case of China. Population control strategies implemented in China in the late 1970s have substantially changed the social and demographic structure of Chinese cities and the traditional role of families in caring for elderly people. To meet the growing needs of elderly residents "aging in place," age-friendly environments and new types of senior services are required and encouraged. This research examines the satisfaction of seniors in relation to the elderly services and living environments available to them, through empirical studies of six types of neighborhoods in Beijing. Using structural equation modeling (SEM), a satisfaction model under the Person-Environment Fit (P-E Fit) model framework was developed. This model considered the senior respondent's health status, economic attributes, family and social support networks, and neighborhood living environments. Social support was found to be the primary factor affecting satisfaction amongst the urban elderly in Beijing. The research also highlights the need to differentiate between different types of neighborhoods, which can differ significantly in terms of the socio-economic attributes (i.e., family structure, income, and education) of their senior residents. As such, based on the path coefficients revealed by different structural equation models of various neighborhoods, four types of neighborhoods were identified: in Type 1 neighborhoods, the neighborhood environment and the senior services provided by communities were primary factors in elderly satisfaction; in Type 2 neighborhoods, the satisfaction of inhabitants was strongly influenced by personal attributes such as health and income; Type 3 neighborhoods were residence of low-income people where the level of social support was the foremost factor; and in Type 4, social

  3. Numerical Modeling of Electric Arcs with Water Vortex and Hybrid Stabilizations

    Science.gov (United States)

    Jeništa, J.; Bartlová, M.; Aubrecht, V.

    2008-02-01

    In this paper we deal with numerical investigation of properties and processes occurring in the electric arcs with tangential stabilization of electric arc by water vortex (Gerdien arc) and with the combined stabilization of arc by axial gas flow and water vortex. The net emission coefficient and the partial characteristics method for radiation loss from these arcs are employed. Results carried out for the water arc for 150-600 A proved that typical outlet velocities are 0.7-8 km s-1, temperatures 14 000 K-26 000 K, the voltage drop 110-200 V, the pressure drop 0.02-0.4 atm. and the Mach numbers range from 0.1 to 0.8. The partial characteristics model gives a lower value of radiation loss from the arc than the net emission model, implying higher outlet velocities and temperatures, closer to experimental values. The hybrid arc exhibits higher outlet velocities under the practically unchanged plasma enthalpy compared to Gerdien arc. The contribution of O2, H2 and OH molecular bands to the amount of reabsorbed radiation has been also discussed. Comparison between present calculation and available experiments carried out at the Institute shows a good agreement.

  4. Modelling and simulation of unsteady dc electric arcs and their interactions with electrodes

    Energy Technology Data Exchange (ETDEWEB)

    Chemartin, L; Lalande, P [ONERA, 29, Avenue de la division Leclerc, 92322 Chatillon (France); Delalondre, C [EDF R and D, 6 quai Watier 78400 Chatou (France); Cheron, B [CORIA, UMR 6614, 76801 Saint Etienne du Rouvray (France); Lago, F, E-mail: laurent.chemartin@onera.fr [DGA, Aeronautical Systems, 47 route de St Jean, 31130 Balma (France)

    2011-05-18

    This paper is devoted to the study of unsteady electric arcs and the effects of electrodes on their dynamics. One of the objectives is to simulate and understand the three-dimensional behaviour of arcs in complex geometries, which create important fluctuations of the column and reattachments on the electrodes. The usual methods to solve the problem of arc-electrodes coupling are not suitable to simulate three-dimensional unsteady arcs. We propose a numerical development to simulate both steady-state and unsteady arcs without additional assumptions. The method is based on the incorporation of electrodes into the computational domain. It is validated with measurements from the literature, in the case of a point-plane steady-state argon arc. The model is used to study the lightning certification test device, which simulates in laboratory the effects of lightning arcs on fuselage panels. The results bring to light, in agreement with the observations in laboratory, the fundamental role of the electrodes on the three-dimensional behaviour of the arc column. The model is also used to simulate the development of the free jet of a plasma on an aluminium planar anode. The objective is to characterize the interaction region and the thermal constraint of the arc.

  5. Modeling of mixing and interaction of multi-cathode spot vacuum arc jets

    Science.gov (United States)

    Wang, Lijun; Qin, Kang; Deng, Jie; Jia, Shenli

    2016-12-01

    Vacuum arc consists of cathode spot and mixing zone, arc column and anode zone. The separate jets and the mixing zone should be considered in the model of diffuse arc. Moreover, the interaction between the plasma jets in multi-cathode spot vacuum arc also is very important. In this paper, mixing and interaction of multi-cathode spot vacuum arc jets were studied through simulation. To completely investigate the mixing and interaction of vacuum arc jets, a steady 3D Magneto-Hydro-Dynamic (MHD) modeling was established. In order to find out the influence of different parameters on mixing and interaction of vacuum arc jets, simulations with different parameters such as currents, angel of vacuum arc jets, with or without electromagnetic equations, tilted jets and different height of mixing zone were conducted. The simulation results show that the densities of ion number and plasma pressure as well as ion temperature increase with the increase of arc current, while the plasma velocity decreases. The jet center is more deviated from the cathode center with the increase of angle of tilted jets.

  6. Dyadic Empathy, Dyadic Coping, and Relationship Satisfaction: A Dyadic Model

    Directory of Open Access Journals (Sweden)

    Christine Levesque

    2014-02-01

    Full Text Available The purpose of the present study was to investigate a theoretical model specifying the direct and indirect associations between dyadic empathy, dyadic coping, and relationship satisfaction in a sample of 187 heterosexual couples. Dyadic and structural aspects of mediation were tested using the Actor-Partner Interdependence Model. Results revealed that greater levels of an individual’s own propensity for dyadic empathy (i.e., one’s ability to experience empathic concern and perspective-taking significantly predicted greater levels of an individual’s own dyadic coping strategies among both male and female participants. Moreover, increased levels of an individual’s own dyadic coping strategies significantly predicted a similar greater degree of an individual’s own relationship satisfaction. Furthermore, results also provide support for the possible mediating role that an individual’s own dyadic coping strategies may hold in explaining the links between an individual’s own empathic concern and an individual’s own relationship satisfaction among male participants. With regard to the dyadic components of the study’s model, findings indicated that perspective-taking among males significantly improve their female partners’ propensity to employ positive dyadic coping strategies. Moreover, empathic concern among female participants was found to improve their male partners’ dyadic coping strategies. Findings suggest the potential utility of examining dyadic coping as a means to expand clinical and empirical insights regarding the links between dyadic empathy and relationship satisfaction.

  7. Mathematical Model and the Simulation of Electrical Arc Welding as Moving Source in Protector Gas Welding

    Directory of Open Access Journals (Sweden)

    Lenuta Suciu

    2006-10-01

    Full Text Available The works presents the mathematical model of electrical arc welding, simulation of the electrical arc as a moving source with help programs software Ansys, passing through three stage of simulation: pre- processing, processing (solution and post-processing.

  8. Modelling of GMA welding in short-arc mode; Modelisation du soudage MIG/MAG en mode short-arc

    Energy Technology Data Exchange (ETDEWEB)

    Planckaert, J.P

    2008-07-15

    Nowadays there is a lot of welding processes giving an answer to the great diversity of joints to realize and to the characteristics of the metals employed. The first chapter describes the different power sources used in welding. After that, a more detailed explanation of arc welding is given. Finally we present the design of a welding test bed. One can, of course, use an empirical approach to optimize a process. Nevertheless there are advantages in choosing an analytical approach since we can expect significant progress in the understanding of the dynamical interactions in the arc. That's why we present in the second chapter the theoretical knowledge concerning the behaviour of the molten metal transferred during Gas Metal Arc Welding. This work involves as well an experimental aspect required for the elaboration of the databases used to build the model. The recordings were made at CTAS on a test bed equipped with an acquisition system for measuring voltage, current, wire feed speed and high speed videos. The third chapter presents our research of a segmentation method to measure some relevant quantities. We propose a software sensor based on the active contour theory and we show good results on experimental movies. An adjustment step of the model is needed and described in the fourth chapter. The created simulator allows us to interpret some important phenomena in welding, to make a sensitive study 'without risk' and to give theoretical defect signatures. (author)

  9. Heat Transfer Affected by Transverse Magnetic Field using 3D Modeling of Arc Plasma

    Science.gov (United States)

    Maeda, Yoshifumi; Tanaka, Tatsuro; Yamamoto, Shinji; Iwao, Toru

    2016-10-01

    Gas shielded metal arc welding is used to join the various metal because this is the high quality joining technology. Thus, this welding is used for a welding of large buildings such as bridges and LNG tanks. However, the welding defect caused by the heat transfer decrement may occur with increasing the wind velocity. This is because that the convection loss increases because the arc deflects to leeward side with increasing the wind velocity. In order to prevent from the arc deflection, it is used that the transverse magnetic field is applied to the arc. However, the arc deflection occurs with increasing the transverse magnetic field excessively. The energy balance of the arc is changed with increasing the convection loss caused by the arc deflection, and the heat transfer to the anode decreases. Therefore, the analysis including the arc and anode is necessary to elucidate the heat transfer to the anode. In this paper, the heat transfer affected by the transverse magnetic field using 3D modeling of the arc plasma is elucidated. The heat transfer to the anode is calculated by using the EMTF(electromagnetic thermal fluid) simulation with increasing the transverse magnetic field. As a result, the heat transfer decreased with increasing the transverse magnetic field.

  10. An empirical investigation of two competing models of patient satisfaction.

    Science.gov (United States)

    Mishra, D P; Singh, J; Wood, V

    1991-01-01

    This paper empirically examines two competing models of patient satisfaction. Specifically, a five factor SERVQUAL model proposed by Parasuraman et al. (1988) and a tripartite model posited by Smith, Bloom, and Davis (1986) are examined. The two models are tested via factor analysis based on data collected from a field survey of hospital patients. The results of this study indicate that the five dimensional SERVQUAL model is not supported by data. On the other hand, there is general support for the tripartite model. Implications of our results for health care practitioners and researchers are discussed. Future directions for research are also outlined.

  11. Mathematical Modeling of the Melting Rate of Metallic Particles in the Electric Arc Furnace

    National Research Council Canada - National Science Library

    González, O. J. P; Ramírez-Argáez, Marco A; Conejo, A. N

    2010-01-01

    A computational fluid dynamics model coupled to a lagrangian model of melting/solidifying particles has been developed to describe the melting kinetics of metallic particles in an industrial Electric Arc Furnace (EAF...

  12. Evaluation and Simulation of Black-box Arc Models for High-Voltage Circuit-Breakers

    OpenAIRE

    Gustavsson, Niklas

    2004-01-01

    The task for this Master thesis was to evaluate different black-box arc models for circuit-breakers with the purpose of finding criteria for the breaking ability. A black-box model is a model that requires no knowledge from the user of the underlying physical processes. Black-box arc models have been used in circuit-breaker development for many years. Arc voltages from tests made in the High Power Laboratory in Ludvika were used for validation, along with the resistance calculated at current ...

  13. An Integrated Model of Patient and Staff Satisfaction Using Queuing Theory.

    Science.gov (United States)

    Komashie, Alexander; Mousavi, Ali; Clarkson, P John; Young, Terry

    2015-01-01

    This paper investigates the connection between patient satisfaction, waiting time, staff satisfaction, and service time. It uses a variety of models to enable improvement against experiential and operational health service goals. Patient satisfaction levels are estimated using a model based on waiting (waiting times). Staff satisfaction levels are estimated using a model based on the time spent with patients (service time). An integrated model of patient and staff satisfaction, the effective satisfaction level model, is then proposed (using queuing theory). This links patient satisfaction, waiting time, staff satisfaction, and service time, connecting two important concepts, namely, experience and efficiency in care delivery and leading to a more holistic approach in designing and managing health services. The proposed model will enable healthcare systems analysts to objectively and directly relate elements of service quality to capacity planning. Moreover, as an instrument used jointly by healthcare commissioners and providers, it affords the prospect of better resource allocation.

  14. Study on heat source model in twin-arc GMAW with a common weld pool

    Institute of Scientific and Technical Information of China (English)

    Zhao Pengcheng; Wang Lulu; Liu Chunting; Huang Shisheng

    2009-01-01

    The heat input from arcs to weld pool in twin-arc gas metal arc welding (GMAW) with a common weld pool is investigated by high-speed photography. The characteristics of arc shapes and droplet transfer are studied and then the models for heat flux distribution on top surface of weld pool and enthalpy distribution of metal droplets transferred into weld pool are established. By using the model, 3-D geometries of weld pools in twin-arc GMAW with a common weld pool are predicted. Corresponding welding experiments on mild steel plates are carried out and the results indicate that the predicted shape of weld bead on cross section shows good agreement with measured one.

  15. [Comparison of level of satisfaction of users of home care: integrated model vs. dispensaries model].

    Science.gov (United States)

    Gorina, Marta; Limonero, Joaquín T; Peñart, Xavier; Jiménez, Jordi; Gassó, Javier

    2014-01-01

    To determine the level of satisfaction of users that receive home health care through two different models of primary health care: integrated model and dispensaries model. cross-sectional, observational study. Two primary care centers in the province of Barcelona. The questionnaire was administered to 158 chronic patients over 65 years old, of whom 67 were receiving health care from the integrated model, and 91 from the dispensaries model. The Evaluation of Satisfaction with Home Health Care (SATISFAD12) questionnaire was, together with other complementary questions about service satisfaction of home health care, as well as social demographic questions (age, sex, disease, etc). The patients of the dispensaries model showed more satisfaction than the users receiving care from the integrated model. There was a greater healthcare continuity for those patients from the dispensaries model, and a lower percentage of hospitalizations during the last year. The satisfaction of the users from both models was not associated to gender, the health perception,or independence of the The user satisfaction rate of the home care by primary health care seems to depend of the typical characteristics of each organisational model. The dispensaries model shows a higher rate of satisfaction or perceived quality of care in all the aspects analysed. More studies are neede to extrapolate these results to other primary care centers belonging to other institutions. Copyright © 2013 Elsevier España, S.L. All rights reserved.

  16. Electrical characteristics of TIG arcs in argon from non-equilibrium modelling and experiment

    Science.gov (United States)

    Baeva, Margarita; Uhrlandt, Dirk; Siewert, Erwan

    2016-09-01

    Electric arcs are widely used in industrial processes so that a thorough understanding of the arc characteristics is highly important to industrial research and development. TIG welding arcs operated with pointed electrodes made of tungsten, doped with cerium oxide, have been studied in order to analyze in detail the electric field and the arc voltage. Newly developed non-equilibrium model of the arc is based on a complete diffusion treatment of particle fluxes, a generalized form of Ohm's law, and boundary conditions accounting for the space-charge sheaths within the magneto-hydrodynamic approach. Experiments have been carried out for electric currents in the range 5-200 A. The electric arc has been initiated between a WC20 cathode and a water-cooled copper plate placed 0.8 mm from each other. The arc length has been continuously increased by 0.1 mm up to 15 mm and the arc voltage has been simultaneously recorded. Modelling and experimental results will be presented and discussed.

  17. Coupled gas flow-plasma model for a gliding arc: investigations of the back-breakdown phenomenon and its effect on the gliding arc characteristics

    Science.gov (United States)

    Sun, S. R.; Kolev, St.; Wang, H. X.; Bogaerts, A.

    2017-01-01

    We present a 3D and 2D Cartesian quasi-neutral plasma model for a low current argon gliding arc discharge, including strong interactions between the gas flow and arc plasma column. The 3D model is applied only for a short time of 0.2 ms due to its huge computational cost. It mainly serves to verify the reliability of the 2D model. As the results in 2D compare well with those in 3D, they can be used for a better understanding of the gliding arc basic characteristics. More specifically, we investigate the back-breakdown phenomenon induced by an artificially controlled plasma channel, and we discuss its effect on the gliding arc characteristics. The back-breakdown phenomenon, or backward-jump motion of the arc, as observed in the experiments, results in a drop of the gas temperature, as well as in a delay of the arc velocity with respect to the gas flow velocity, allowing more gas to pass through the arc, and thus increasing the efficiency of the gliding arc for gas treatment applications.

  18. Modeling corrosion behavior of gas tungsten arc welded titanium alloy

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The pitting corrosion characteristics of pulse TIG welded Ti-6Al-4V titanium alloy in marine environment were explained.Besides the rapid advance of titanium metallurgy, this is also due to the successful solution of problems associated with the development of titanium alloy welding. The preferred welding process of titanium alloy is frequently gas tungsten arc(GTA) welding due to its comparatively easier applicability and better economy. In the case of single pass GTA welding of thinner section of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current process. The benefit of the process is utilized to obtain better quality titanium weldments. Four factors, five levels, central composite, rotatable design matrix are used to optimize the required number of experiments. The mathematical models have been developed by response surface method(RSM). The results reveal that the titanium alloy can form a protective scale in marine environment and is resistant to pitting corrosion. Experimental results are provided to illustrate the proposed approach.

  19. Modeling and solving semiring constraint satisfaction problems by transformation to weighted semiring Max-SAT

    CSIR Research Space (South Africa)

    Leenen, L

    2007-12-01

    Full Text Available The authors present a variant of the Weighted Maximum Satisfiability Problem (Weighted Max-SAT), which is a modeling of the Semiring Constraint Satisfaction framework. They show how to encode a Semiring Constraint Satisfaction Problem (SCSP...

  20. An Indigenous Model of Career Satisfaction: Exploring the Role of Workplace Cultural Wellbeing

    Science.gov (United States)

    Haar, Jarrod M.; Brougham, Dave M.

    2013-01-01

    Despite career satisfaction models being well established, little is understood about the career satisfaction of indigenous employees. Using a sample of 172 Maori employees, the indigenous people of New Zealand, we tested a career satisfaction model with a cultural wellbeing factor over and above established factors of human capital,…

  1. Test of a Social Cognitive Model of Work Satisfaction in Teachers

    Science.gov (United States)

    Duffy, Ryan D.; Lent, Robert W.

    2009-01-01

    Lent and Brown [Lent, R. W., & Brown, S. D. (2006). "Integrating person and situation perspectives on work satisfaction: A social-cognitive view." "Journal of Vocational Behavior,69", 236-247] recently proposed an integrative model of work satisfaction linked to social cognitive career theory. The model posits that work satisfaction is predicted…

  2. An Indigenous Model of Career Satisfaction: Exploring the Role of Workplace Cultural Wellbeing

    Science.gov (United States)

    Haar, Jarrod M.; Brougham, Dave M.

    2013-01-01

    Despite career satisfaction models being well established, little is understood about the career satisfaction of indigenous employees. Using a sample of 172 Maori employees, the indigenous people of New Zealand, we tested a career satisfaction model with a cultural wellbeing factor over and above established factors of human capital,…

  3. The Interpersonal Exchange Model of Sexual Satisfaction: Implications for Sex Therapy with Couples.

    Science.gov (United States)

    Byers, E. Sandra

    1999-01-01

    Little has been written in empirical or clinical literature about enhancement of sexual satisfaction, and there has not been a theoretical model to guide research on factors influencing sexual satisfaction. The Interpersonal Exchange Model of Sexual Satisfaction (IEMSS) was developed to fill the gaps. Article describes IEMSS and the studies that…

  4. Arc-related porphyry molybdenum deposit model: Chapter D in Mineral deposit models for resource assessment

    Science.gov (United States)

    Taylor, Ryan D.; Hammarstrom, Jane M.; Piatak, Nadine M.; Seal, Robert R., II

    2012-01-01

    This report provides a descriptive model for arc-related porphyry molybdenum deposits. Presented within are geological, geochemical, and mineralogical characteristics that differentiate this deposit type from porphyry copper and alkali-feldspar rhyolite-granite porphyry molybdenum deposits. The U.S. Geological Survey's effort to update existing mineral deposit models spurred this research, which is intended to supplement previously published models for this deposit type that help guide mineral-resource and mineral-environmental assessments.

  5. Social Cognitive Model of College Satisfaction: A Test of Measurement and Path Models

    Science.gov (United States)

    Feldt, Ronald C.

    2012-01-01

    The study examined a model that integrates social-cognitive and trait-personality constructs to examine two domains of college satisfaction. Direct and indirect effects were observed for conscientiousness, perception of institutional resources, self-efficacy, and goal progress. Paths differed for personal and institutional satisfaction. Most…

  6. Kinetic Modeling of Plasma Methane Conversion Using Gliding Arc

    Institute of Scientific and Technical Information of China (English)

    Antonius Indarto; Jae-Wook Choi; Hwaung Lee; Hyung Keun Song

    2005-01-01

    Plasma methane (CH4) conversion in gliding arc discharge was examined. The result data of experiments regarding the performance of gliding arc discharge were presented in this paper. A simulation which is consisted some chemical kinetic mechanisms has been provided to analyze and describe the plasma process. The effect of total gas flow rate and input frequency refers to power consumption have been studied to evaluate the performance of gliding arc plasma system and the reaction mechanism of decomposition.Experiment results indicated that the maximum conversion of CH4 reached 50% at the total gas flow rate of 1 L/min. The plasma reaction was occurred at the atmospheric pressure and the main products were C (solid), hydrogen, and acetylene (C2H2). The plasma reaction of methane conversion was exothermic reaction which increased the product stream temperature around 30-50 ℃.

  7. Global Topographic 30 Arc-Second Digital Elevation Model: Released 1996

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30 was derived from several...

  8. Global Topographic 30 Arc-Second Digital Elevation Model: Released 1996

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30 was derived from several...

  9. Probabilistic modelling of the high-pressure arc cathode spot displacement dynamic

    CERN Document Server

    Coulombe, S

    2003-01-01

    A probabilistic modelling approach for the study of the cathode spot displacement dynamic in high-pressure arc systems is developed in an attempt to interpret the observed voltage fluctuations. The general framework of the model allows to define simple, probabilistic displacement rules, the so-called cathode spot dynamic rules, for various possible surface states (un-arced metal, arced, contaminated) and to study the resulting dynamic of the cathode spot displacements over one or several arc passages. The displacements of the type-A cathode spot (macro-spot) in a magnetically rotating arc using concentric electrodes made up of either clean or contaminated metal surfaces is considered. Experimental observations for this system revealed a 1/f sup - sup t sup i sup l sup d sup e sup 1 signature in the frequency power spectrum (FPS) of the arc voltage for anchoring arc conditions on the cathode (e.g. clean metal surface), while it shows a 'white noise' signature for conditions favouring a smooth movement (e.g. ox...

  10. Interaction between GIS and hydrologic model: A preliminary approach using ArcHydro Framework Data Model

    Directory of Open Access Journals (Sweden)

    Silvio Jorge C. Simões

    2013-08-01

    Full Text Available In different regions of Brazil, population growth and economic development can degrade water quality, compromising watershed health and human supply. Because of its ability to combine spatial and temporal data in the same environment and to create water resources management (WRM models, the Geographical Information System (GIS is a powerful tool for managing water resources, preventing floods and estimating water supply. This paper discusses the integration between GIS and hydrological models and presents a case study relating to the upper section of the Paraíba do Sul Basin (Sao Paulo State portion, situated in the Southeast of Brazil. The case study presented in this paper has a database suitable for the basin’s dimensions, including digitized topographic maps at a 50,000 scale. From an ArcGIS®/ArcHydro Framework Data Model, a geometric network was created to produce different raster products. This first grid derived from the digital elevation model grid (DEM is the flow direction map followed by flow accumulation, stream and catchment maps. The next steps in this research are to include the different multipurpose reservoirs situated along the Paraíba do Sul River and to incorporate rainfall time series data in ArcHydro to build a hydrologic data model within a GIS environment in order to produce a comprehensive spatial temporal model.

  11. Examining Antecedents and Consequences of Tourist Satisfaction: A Structural Modeling Approach

    Institute of Scientific and Technical Information of China (English)

    WANG Xia; ZHANG Jie; GU Chaolin; ZHEN Feng

    2009-01-01

    While the importance of tourist satisfaction has been recognized by academic researchers for at least four decades, adequate tourist satisfaction models have not been developed or validated. This study presents a tourist satisfaction model for a destination and explores the antecedents (tourist expectations, destination image, perceived quality, and perceived value) and the consequences (tourist complaints and tourist loyalty) of tourist satisfaction using Guilin for the case study. Structural equation modeling results support the tourist satisfaction model of tourist expectations, destination image, perceived quality, and per-ceived value as four key antecedents of tourist satisfaction, with tourist satisfaction having a negative effect on tourist complaints and a positive effect on tourist loyalty. Managerial implications are drawn from the study findings and suggestions are given for future work.

  12. Bivergent thrust wedges surrounding oceanic island arcs: Insight from observations and sandbox models of the northeastern caribbean plate

    Science.gov (United States)

    ten Brink, U.S.; Marshak, S.; Granja, Bruna J. L.

    2009-01-01

    At several localities around the world, thrust belts have developed on both sides of oceanic island arcs (e.g., Java-Timor, Panama, Vanuatu, and the northeastern Caribbean). In these localities, the overall vergence of the backarc thrust belt is opposite to that of the forearc thrust belt. For example, in the northeastern Caribbean, a north-verging accretionary prism lies to the north of the Eastern Greater Antilles arc (Hispaniola and Puerto Rico), whereas a south-verging thrust belt called the Muertos thrust belt lies to the south. Researchers have attributed such bivergent geometry to several processes, including: reversal of subduction polarity; subduction-driven mantle flow; stress transmission across the arc; gravitational spreading of the arc; and magmatic inflation within the arc. New observations of deformational features in the Muertos thrust belt and of fault geometries produced in sandbox kinematic models, along with examination of published studies of island arcs, lead to the conclusion that the bivergence of thrusting in island arcs can develop without reversal of subduction polarity, without subarc mantle flow, and without magmatic inflation. We suggest that the Eastern Greater Antilles arc and comparable arcs are simply crustalscale bivergent (or "doubly vergent") thrust wedges formed during unidirectional subduction. Sandbox kinematic modeling suggests, in addition, that a broad retrowedge containing an imbricate fan of thrusts develops only where the arc behaves relatively rigidly. In such cases, the arc acts as a backstop that transmits compressive stress into the backarc region. Further, modeling shows that when arcs behave as rigid blocks, the strike-slip component of oblique convergence is accommodated entirely within the prowedge and the arc-the retrowedge hosts only dip-slip faulting ("frontal thrusting"). The existence of large retrowedges and the distribution of faulting in an island arc may, therefore, be evidence that the arc is

  13. Precise modeling of arc tooth face-gear with transition curve

    Institute of Scientific and Technical Information of China (English)

    Cui Yanmei; Fang Zongde; Su Jinzhan; Feng Xianzhang; Peng Xianlong

    2013-01-01

    A fabrication method is adopted for which an imaginary gear simultaneously realizes conjugated meshing with an arc tooth cylindrical gear and an arc tooth face-gear. The cutter fillet and tooth crest edge form the tooth root fillet of the gear, and the linear tooth surface equation of the imaginary gear and the position vector of the curvature center of the cutter fillet are constructed with certain cutter inclination to deduce a working arc tooth surface equation. The tooth root fillet equation of the arc tooth face-gear is derived from the meshing geometry and kinematics. A numer-ically controlled machining model of the arc tooth face-gear is established through the transforma-tion of adjustment parameters from the cutter-tilt milling machine to a common multi-axis NC machine. Motion parameters of each movement axis of the NC machine are acquired. A processing example is presented to verify the precision of the fabrication method in processing the arc tooth face-gear. The method provides a theoretical and tentative basis for the analysis of tooth surface contact stress, tooth root bending stress and dynamics. A hobbing test is conducted to demonstrate the good meshing condition of the arc tooth face-gear pair.

  14. Associations among attachment, sexuality, and marital satisfaction in adult Chilean couples: a linear hierarchical models analysis.

    Science.gov (United States)

    Heresi Milad, Eliana; Rivera Ottenberger, Diana; Huepe Artigas, David

    2014-01-01

    This study aimed to explore the associations among attachment system type, sexual satisfaction, and marital satisfaction in adult couples in stable relationships. Participants were 294 couples between the ages of 20 and 70 years who answered self-administered questionnaires. Hierarchical linear modeling revealed that the anxiety and avoidance, sexual satisfaction, and marital satisfaction dimensions were closely related. Specifically, the avoidance dimension, but not the anxiety dimension, corresponded to lower levels of sexual and marital satisfaction. Moreover, for the sexual satisfaction variable, an interaction effect was observed between the gender of the actor and avoidance of the partner, which was observed only in men. In the marital satisfaction dimension, effects were apparent only at the individual level; a positive relation was found between the number of years spent living together and greater contentment with the relationship. These results confirm the hypothetical association between attachment and sexual and marital satisfaction and demonstrate the relevance of methodologies when the unit of analysis is the couple.

  15. CO2 conversion in a gliding arc plasma: 1D cylindrical discharge model

    Science.gov (United States)

    Wang, Weizong; Berthelot, Antonin; Kolev, Stanimir; Tu, Xin; Bogaerts, Annemie

    2016-12-01

    CO2 conversion by a gliding arc plasma is gaining increasing interest, but the underlying mechanisms for an energy-efficient process are still far from understood. Indeed, the chemical complexity of the non-equilibrium plasma poses a challenge for plasma modeling due to the huge computational load. In this paper, a one-dimensional (1D) gliding arc model is developed in a cylindrical frame, with a detailed non-equilibrium CO2 plasma chemistry set, including the CO2 vibrational kinetics up to the dissociation limit. The model solves a set of time-dependent continuity equations based on the chemical reactions, as well as the electron energy balance equation, and it assumes quasi-neutrality in the plasma. The loss of plasma species and heat due to convection by the transverse gas flow is accounted for by using a characteristic frequency of convective cooling, which depends on the gliding arc radius, the relative velocity of the gas flow with respect to the arc and on the arc elongation rate. The calculated values for plasma density and plasma temperature within this work are comparable with experimental data on gliding arc plasma reactors in the literature. Our calculation results indicate that excitation to the vibrational levels promotes efficient dissociation in the gliding arc, and this is consistent with experimental investigations of the gliding arc based CO2 conversion in the literature. Additionally, the dissociation of CO2 through collisions with O atoms has the largest contribution to CO2 splitting under the conditions studied. In addition to the above results, we also demonstrate that lumping the CO2 vibrational states can bring a significant reduction of the computational load. The latter opens up the way for 2D or 3D models with an accurate description of the CO2 vibrational kinetics.

  16. Electrical and thermal finite element modeling of arc faults in photovoltaic bypass diodes.

    Energy Technology Data Exchange (ETDEWEB)

    Bower, Ward Isaac; Quintana, Michael A.; Johnson, Jay

    2012-01-01

    Arc faults in photovoltaic (PV) modules have caused multiple rooftop fires. The arc generates a high-temperature plasma that ignites surrounding materials and subsequently spreads the fire to the building structure. While there are many possible locations in PV systems and PV modules where arcs could initiate, bypass diodes have been suspected of triggering arc faults in some modules. In order to understand the electrical and thermal phenomena associated with these events, a finite element model of a busbar and diode was created. Thermoelectrical simulations found Joule and internal diode heating from normal operation would not normally cause bypass diode or solder failures. However, if corrosion increased the contact resistance in the solder connection between the busbar and the diode leads, enough voltage potentially would be established to arc across micron-scale electrode gaps. Lastly, an analytical arc radiation model based on observed data was employed to predicted polymer ignition times. The model predicted polymer materials in the adjacent area of the diode and junction box ignite in less than 0.1 seconds.

  17. Studies of transformational leadership: evaluating two alternative models of trust and satisfaction.

    Science.gov (United States)

    Yang, Yi-Feng

    2014-06-01

    This study evaluates the influence of leadership style and employee trust in their leaders on job satisfaction. 341 personnel (164 men, 177 women; M age = 33.5 yr., SD = 5.1) from four large insurance companies in Taiwan completed the transformational leadership behavior inventory, the leadership trust scale and a short version of the Minnesota (Job) Satisfaction Questionnaire. A bootstrapping mediation and structural equation modeling revealed that the effect of transformational leadership on job satisfaction was mediated by leadership trust. This study highlights the importance of leadership trust in leadership-satisfaction relationships, and provides managers with practical ways to enhance job satisfaction.

  18. Patient satisfaction and organizational impact: a hierarchical linear modeling approach.

    Science.gov (United States)

    Otani, Koichiro; Kim, B Joon; Waterman, Brian; Boslaugh, Sarah; Klinkenberg, W Dean; Dunagan, W Claiborne

    2012-01-01

    This article presents the rationale for using multilevel analysis to address the broad environmental contexts in patient satisfaction research. This study utilized patient satisfaction data and the American Hospital Association Hospital Guide Book (2004). This study found significant contributions of individual patient attribute reactions (nursing care, physician care, etc.), and also clearly demonstrated hospital-level effects and cross-level interactions on patient satisfaction. Thus, it is clear that patient satisfaction is not solely explained by patients' attribute reactions and their demographic variables, but is also explained by patients' hospital levels. This approach would offer additional understanding in patient satisfaction research.

  19. Parameter Estimation for an Electric Arc Furnace Model Using Maximum Likelihood

    Directory of Open Access Journals (Sweden)

    Jesser J. Marulanda-Durango

    2012-12-01

    Full Text Available In this paper, we present a methodology for estimating the parameters of a model for an electrical arc furnace, by using maximum likelihood estimation. Maximum likelihood estimation is one of the most employed methods for parameter estimation in practical settings. The model for the electrical arc furnace that we consider, takes into account the non-periodic and non-linear variations in the voltage-current characteristic. We use NETLAB, an open source MATLAB® toolbox, for solving a set of non-linear algebraic equations that relate all the parameters to be estimated. Results obtained through simulation of the model in PSCADTM, are contrasted against real measurements taken during the furnance's most critical operating point. We show how the model for the electrical arc furnace, with appropriate parameter tuning, captures with great detail the real voltage and current waveforms generated by the system. Results obtained show a maximum error of 5% for the current's root mean square error.

  20. JEMMRLA - Electron Model of a Muon RLA with Multi-pass Arcs

    Energy Technology Data Exchange (ETDEWEB)

    Bogacz, Slawomir Alex; Krafft, Geoffrey A.; Morozov, Vasiliy S.; Roblin, Yves R.

    2013-06-01

    We propose a demonstration experiment for a new concept of a 'dogbone' RLA with multi-pass return arcs -- JEMMRLA (Jlab Electron Model of Muon RLA). Such an RLA with linear-field multi-pass arcs was introduced for rapid acceleration of muons for the next generation of Muon Facilities. It allows for efficient use of expensive RF while the multi-pass arc design based on linear combined-function magnets exhibits a number of advantages over separate-arc or pulsed-arc designs. Here we describe a test of this concept by scaling a GeV scale muon design for electrons. Scaling muon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.5 MeV electron beam is injected in the middle of a 3 MeV/pass linac with two double-pass return arcs and is accelerated to 18 MeV in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, which arises from scaling the 200 MHz muon RF to a readily available 1.5 GHz. The hardware requirements are not very demanding making it straightforward to implement. Such an RLA may have applications going beyond muon acceleration: in medical isotope production, radiation cancer therapy and homeland security.

  1. A mathematical modeling proposal for a Multiple Tasks Periodic Capacitated Arc Routing Problem

    Directory of Open Access Journals (Sweden)

    Cleverson Gonçalves dos Santos

    2015-12-01

    Full Text Available The countless accidents and incidents occurred at dams at the last years, propelled the development of politics related with dams safety. One of the strategies is related to the plan for instrumentation and monitoring of dams. The monitoring demands from the technical team the reading of the auscultation data, in order to periodically monitor the dam. The monitoring plan of the dam can be modeled as a problem of mathematical program of the periodical capacitated arcs routing program (PCARP. The PCARP is considered as a generalization of the classic problem of routing in capacitated arcs (CARP due to two characteristics: 1 Planning period larger than a time unity, as that vehicle make several travels and; 2 frequency of associated visits to the arcs to be serviced over the planning horizon. For the dam's monitoring problem studied in this work, the frequent visits, along the time horizon, it is not associated to the arc, but to the instrument with which is intended to collect the data. Shows a new problem of Multiple tasks Periodic Capacitated Arc Routing Problem and its elaboration as an exact mathematical model. The new main characteristics presented are: multiple tasks to be performed on each edge or edges; different frequencies to accomplish each of the tasks; heterogeneous fleet; and flexibility for more than one vehicle passing through the same edge at the same day. The mathematical model was implemented and examples were generated randomly for the proposed model's validation.

  2. Evaluation model for process stability of short-circuiting arc welding

    Institute of Scientific and Technical Information of China (English)

    Cai Yan; Yang Hailan; Hua Xueming; Wu Yixiong

    2008-01-01

    stability of welding process is the prerequisite and assurance for ideal joint. The structure of stability model and its optimization are the key to on-line evaluation technology of arc welding. Characteristic parameters are extracted from the single transfer period while variation coefficients of the characteristic parameters are concerned for whole welding process of continuous drop transfer. Based on the characteristic parameters and their variation coefficients, stability model of short-circuit arc welding process is established by partial-least-square regression (PLSR) that can overcome multicollinearity of input parameters. The experiment results show that this model can meet the requirement of accuracy.

  3. Three-dimensional modelling of electric-arc development in a low-voltage circuit-breaker

    Energy Technology Data Exchange (ETDEWEB)

    Piqueras, L.; Henry, D.; Jeandel, D.; Scott, J. [Laboratoire de Mecanique des Fluides et d' Acoustique, CNRS/Universite de Lyon, Ecole Centrale de Lyon/Universite Lyon 1/INSA de Lyon, ECL, 36 avenue Guy de Collongue, 69134 Ecully Cedex (France); Wild, J. [Schneider Electric, 37 quai Merlin, 38050 Grenoble Cedex 9 (France)

    2008-09-15

    This article describes direct numerical simulation of the first three milliseconds following ignition of the arc in a low-voltage circuit-breaker using a computational-fluid-dynamics code adapted for electric-arc modelling. The mobile electrode is allowed for by a moving mesh. The results describe the evolution of the arc with time in terms of its detailed electrical, thermal and fluid dynamic properties. They allow the identification of several phases during the overall arc development process studied here: arc initialisation in the widening electrode gap, arc-thermal expansion, displacement of the arc towards the tip of the mobile electrode, and the beginning of commutation to the fixed electrode. (author)

  4. Numerical modelling of steel arc welding; Modelisation numerique du soudage a l'arc des aciers

    Energy Technology Data Exchange (ETDEWEB)

    Hamide, M

    2008-07-15

    Welding is a highly used assembly technique. Welding simulation software would give access to residual stresses and information about the weld's microstructure, in order to evaluate the mechanical resistance of a weld. It would also permit to evaluate the process feasibility when complex geometrical components are to be made, and to optimize the welding sequences in order to minimize defects. This work deals with the numerical modelling of arc welding process of steels. After describing the industrial context and the state of art, the models implemented in TransWeld (software developed at CEMEF) are presented. The set of macroscopic equations is followed by a discussion on their numerical implementation. Then, the theory of re-meshing and our adaptive anisotropic re-meshing strategy are explained. Two welding metal addition techniques are investigated and are compared in terms of the joint size and transient temperature and stresses. The accuracy of the finite element model is evaluated based on experimental results and the results of the analytical solution. Comparative analysis between experimental and numerical results allows the assessment of the ability of the numerical code to predict the thermomechanical and metallurgical response of the welded structure. The models limitations and the phenomena identified during this study are finally discussed and permit to define interesting orientations for future developments. (author)

  5. Application of ARCS Motivation Model in the Open English Teaching%ARCS 动机模式在开放英语教学中的应用

    Institute of Scientific and Technical Information of China (English)

    印丽萍

    2015-01-01

    The characteristics of students and courses in open English education lead to subsequent problems in teaching,a-mong which the lack of learning motivation is one of the most obvious problems.Therefore,based on former study,through ana-lyzing learning needs and using the interview and questionnaire methods,the application of ARCS theory in the open English teaching has been further discussed with its four factors'strategies (attention,relevance,confidence and satisfaction)of stimu-lating motivation in order to improve students'English learning motivation.This research reveals that ARCS theory is indeed helpful to the improvement of motivation level,especially for the two aspects of the relevance and satisfaction .%开放英语教育过程中,学员以及课程的特点决定了教学过程中产生的后续问题,学员学习动机缺乏就是其中最为显著的问题之一。为此,本课题基于原有研究的基础上,通过对学习需求的分析,运用访谈及问卷等研究方法,结合 ARCS 模式理论中的注意、切身性、自信和满意四个层面的动机激励策略,进一步探讨了该理论对开放英语教学的应用,以期提高学员的英语学习动机。研究发现,该理论确实有助于提高动机水平,尤其是切身性和满意感两方面效果较为显著。

  6. Empirical research on Kano's model and customer satisfaction.

    Science.gov (United States)

    Lin, Feng-Han; Tsai, Sang-Bing; Lee, Yu-Cheng; Hsiao, Cheng-Fu; Zhou, Jie; Wang, Jiangtao; Shang, Zhiwen

    2017-01-01

    Products are now developed based on what customers desire, and thus attractive quality creation has become crucial. In studies on customer satisfaction, methods for analyzing quality attributes and enhancing customer satisfaction have been proposed to facilitate product development. Although substantial studies have performed to assess the impact of the attributes on customer satisfaction, little research has been conducted that quantitatively calculate the odds of customer satisfaction for the Kano classification, fitting a nonlinear relationship between attribute-level performance and customer satisfaction. In the present study, the odds of customer satisfaction were determined to identify the classification of quality attributes, and took customer psychology into account to suggest how decision-makers should prioritize the allocation of resources. A novel method for quantitatively assessing quality attributes was proposed to determine classification criteria and fit the nonlinear relationship between quality attributes and customer satisfaction. Subsequently, a case study was conducted on bicycle user satisfaction to verify the novel method. The concept of customer satisfaction odds was integrated with the value function from prospect theory to understand quality attributes. The results of this study can serve as a reference for product designers to create attractive quality attributes in their products and thus enhance customer satisfaction.

  7. Empirical research on Kano’s model and customer satisfaction

    Science.gov (United States)

    Lin, Feng-Han; Tsai, Sang-Bing; Lee, Yu-Cheng; Hsiao, Cheng-Fu; Zhou, Jie; Wang, Jiangtao; Shang, Zhiwen

    2017-01-01

    Products are now developed based on what customers desire, and thus attractive quality creation has become crucial. In studies on customer satisfaction, methods for analyzing quality attributes and enhancing customer satisfaction have been proposed to facilitate product development. Although substantial studies have performed to assess the impact of the attributes on customer satisfaction, little research has been conducted that quantitatively calculate the odds of customer satisfaction for the Kano classification, fitting a nonlinear relationship between attribute-level performance and customer satisfaction. In the present study, the odds of customer satisfaction were determined to identify the classification of quality attributes, and took customer psychology into account to suggest how decision-makers should prioritize the allocation of resources. A novel method for quantitatively assessing quality attributes was proposed to determine classification criteria and fit the nonlinear relationship between quality attributes and customer satisfaction. Subsequently, a case study was conducted on bicycle user satisfaction to verify the novel method. The concept of customer satisfaction odds was integrated with the value function from prospect theory to understand quality attributes. The results of this study can serve as a reference for product designers to create attractive quality attributes in their products and thus enhance customer satisfaction. PMID:28873418

  8. Assessing overall patient satisfaction in inflammatory bowel disease using structural equation modeling.

    Science.gov (United States)

    Soares, João-Bruno; Marinho, Ana S; Fernandes, Dália; Moreira Gonçalves, Bruno; Camila-Dias, Cláudia; Gonçalves, Raquel; Magro, Fernando

    2015-08-01

    Structural equation modeling (SEM) is a very popular data-analytic technique for the evaluation of customer satisfaction. We aimed to measure the overall satisfaction of inflammatory bowel disease (IBD) patients with healthcare in Portugal and to define its main determinants using SEM. The study included three steps: (i) specification of a patient satisfaction model that included the following dimensions: Image, Expectations, Facilities, Admission process, Assistant staff, Nursing staff, Medical staff, Treatment, Inpatient care, Outpatient care, Overall quality, Overall satisfaction, and Loyalty; (ii) sample survey from 2000 patients, members of the Portuguese Association of the IBD; and (iii) estimation of the satisfaction model using partial least squares (XLSTAT-PLSPM). We received 498 (25%) valid questionnaires from 324 (66%) patients with Crohn's disease and 162 (33%) patients with ulcerative colitis. Our model provided a substantial explanation for Overall satisfaction (R=0.82). The mean index of overall satisfaction was 74.4 (0-100 scale). The main determinants of Overall satisfaction were the Image (β=0.26), Outpatient care (β=0.23), and Overall quality (β=0.21), whose mean indices were 83, 75, and 81, respectively. Facilities and Inpatient care were the variables with a significant impact on Overall satisfaction and the worst mean indices. SEM is useful for the evaluation of IBD patient satisfaction. The Overall satisfaction of IBD patients with healthcare in Portugal is good, but to increase it, IBD services need to focus on the improvement of Outpatient care, Facilities, and Inpatient care. Our model could be a matrix for a global model of IBD patient satisfaction.

  9. FE MODELING & ANALYSIS OF ARC WELDED T-JOINT

    Directory of Open Access Journals (Sweden)

    S.N.Pilare

    2012-06-01

    Full Text Available Arc welded structures are widely used in automobiles, constructions & power plants. As the main cause of weldment failure is design defect & overload, hence it is necessary to analyze the maximum stresses inthe weldment. In this paper an experimentation is carried out on welded T-joint to determine the breaking stress in the weldment. The FE analysis & analytical estimation of breaking stress is also carried out to verify the experimental results. The stress distribution along weld size & throat thickness is evaluated and also compared with reported findings. Further T-joint weld is analyzed under static tensile & bending load by varying the gap between parent plates with and without chamfer at weldment edges. The fatigue analysis under alternating tensile and bending load is also carried out and fatigue life of weldment is predicted with variation in the gap between parent plates.

  10. Fundamental structure model of island arcs and subducted plates in and around Japan

    Science.gov (United States)

    Iwasaki, T.; Sato, H.; Ishiyama, T.; Shinohara, M.; Hashima, A.

    2015-12-01

    The eastern margin of the Asian continent is a well-known subduction zone, where the Pacific (PAC) and Philippine Sea (PHS) plates are being subducted. In this region, several island arcs (Kuril, Northeast Japan, Southwest Japan, Izu-Bonin and Ryukyu arcs) meet one another to form a very complicated tectonic environment. At 2014, we started to construct fundamental structure models for island arcs and subducted plates in and around Japan. Our research is composed of 6 items of (1) topography, (2) plate geometry, (3) fault models, (4) the Moho and brittle-ductile transition zone, (5) the lithosphere-asthenosphere boundary, and (6) petrological/rheological models. Such information is basic but inevitably important in qualitative understanding not only for short-term crustal activities in the subduction zone (particularly caused by megathrust earthquakes) but also for long-term cumulative deformation of the arcs as a result of strong plate-arc/arc-arc interactions. This paper is the first presentation of our research, mainly presenting the results of items (1) and (2). The area of our modelling is 12o-54o N and 118o-164o E to cover almost the entire part of Japanese Islands together with Kuril, Ryukyu and Izu-Bonin trenches. The topography model was constructed from the 500-m mesh data provided from GSJ, JODC, GINA and Alaska University. Plate geometry models are being constructed through the two steps. In the first step, we modelled very smooth plate boundaries of the Pacific and Philippine Sea plates in our whole model area using 42,000 earthquake data from JMA, USGS and ISC. For 7,800 cross sections taken with several directions to the trench axes, 2D plate boundaries were defined by fitting to the earthquake distribution (the Wadati-Benioff zone), from which we obtained equi-depth points of the plate boundary. These equi-depth points were then approximated by spline interpolation technique to eliminate shorter wave length undulation (plate geometry with longer

  11. Three-dimensional model and simulation of vacuum arcs under axial magnetic fields

    Science.gov (United States)

    Wang, Lijun; Jia, Shenli; Zhou, Xin; Wang, Haijing; Shi, Zongqian

    2012-01-01

    In this paper, a three-dimensional (3d) magneto-hydro-dynamic (MHD) model of axial magnetic field vacuum arcs (AMFVAs) is established. Based on this model, AMFVAs are simulated and analyzed. Three-dimensional spatial distributions of many important plasma parameters and electric characteristics in AMFVAs can be obtained, such as ion number density, ion temperature, electron temperature, plasma pressure, current densities along different directions (x, y, and z), ion velocities along different directions, electric fields strength along different directions, and so on. Simulation results show that there exist significant spiral-shaped rotational phenomena in the AMFVAs, this kind of rotational phenomenon also can be verified by the many related experiments (AMFVAs photographs, especially for stronger AMF strength). For current simulation results of AMFVAs, the maximal rotational velocity at anode side is about 1100 m/s. Radial electric field is increased from arc center to arc edge; axial electric field is decreased from cathode side to anode side. Radial electric field at arc edge can be larger than axial electric field. Azimuthal electric field in most regions is much smaller than radial and axial electric field, but it can reach about 1.19 kV/m. Radial magnetic field is the smallest one compared with other components, it reaches to maximum value at the position near to anode, it can influence arc characteristics.

  12. The Self-Gravity Model of the Longitudinal Span of the Neptune Arc Fraternité

    Directory of Open Access Journals (Sweden)

    Tsui K. H.,

    2013-07-01

    Full Text Available According to recent work, the Neptune Adams ring main arc Fraternite is regarded as captured by the corotation elliptic resonance (CER potential of Galatea. The minor arcs Egalite (2,1, Libert ´ e, and Courage are located at positions where the time ´ averaged forces, due to the 42-43 corotation-Lindblad resonances under the central field of Neptune, vanish. With adequately chosen Fraternite mass and Galatea eccentricity, ´ this model gives minor arc locations compatible to observed positions, and allows a dynamic transport of materials among arcs. To complement this model, the effect of self-gravity of Fraternite, with a distributed mass, is evaluated together with the CER ´ potential to account for its 10o longitudinal span. Although self-gravity is the collective action of all the particles in the arc, each individual particle will see the self-potential with a central maximum as an external potential generated by other particles.

  13. A dual change model of life satisfaction and functioning for individuals with schizophrenia.

    Science.gov (United States)

    Edmondson, Melissa; Pahwa, Rohini; Lee, Karen Kyeunghae; Hoe, Maanse; Brekke, John S

    2012-08-01

    Despite the notion that increases in functioning should be associated with increases in life satisfaction in schizophrenia, research has often found no association between the two. Dual change models of global and domain-specific life satisfaction and functioning were examined in 145 individuals with schizophrenia receiving community-based services over 12 months. Functioning and satisfaction were measured using the Role Functioning Scale and Satisfaction with Life Scale. Data were analyzed using latent growth curve modeling. Improvement in global life satisfaction was associated with improvement in overall functioning over time. Satisfaction with living situation also improved as independent functioning improved. Work satisfaction did not improve as work functioning improved. Although social functioning improved, satisfaction with social relationships did not. The link between overall functioning and global life satisfaction provides support for a recovery-based orientation to community based psychosocial rehabilitation services. When examining sub-domains, the link between outcomes and subjective experience suggests a more complex picture than previously found. These findings are crucial to interventions and programs aimed at improving functioning and the subjective experiences of consumers recovering from mental illness. Interventions that show improvements in functional outcomes can assume that they will show concurrent improvements in global life satisfaction as well and in satisfaction with independent living. Interventions geared toward improving social functioning will need to consider the complexity of social relationships and how they affect satisfaction associated with personal relationships. Interventions geared towards improving work functioning will need to consider how the quality and level of work affect satisfaction with employment. Copyright © 2012 Elsevier B.V. All rights reserved.

  14. User satisfaction-based quality evaluation model and survey analysis of network information service

    Institute of Scientific and Technical Information of China (English)

    LEI; Xue; JIAO; Yuying

    2009-01-01

    On the basis of user satisfaction,authors made research hypotheses by learning from relevant e-service quality evaluation models.A questionnaire survey was then conducted on some content-based websites in terms of their convenience,information quality,personalization and site aesthetics,which may affect the overall satisfaction of users.Statistical analysis was also made to build a user satisfaction-based quality evaluation system of network information service.

  15. A Model of Website Quality-Based E-Commerce Satisfaction Index

    Directory of Open Access Journals (Sweden)

    Pilelienė Lina

    2016-03-01

    Full Text Available In the contemporary highly competitive e-business market, organization’s success depends on satisfaction and loyalty of its customers. Whereas the differentiation of the determinants and their impact on customer satisfaction in different countries exists, the research aims at developing a model of website quality-based e-commerce customer satisfaction index. While achieving the aim of the article, the analysis and synthesis of scientific literature is provided. Furthermore, quantitative research and the analysis of the research results by means of principle component analysis, structural equation modelling using partial least squares path modelling methodology, and Importance-Performance matrix are applied. As a research result, the model of website quality-based e-commerce customer satisfaction index is elaborated. Latter model indicates the factors, which are worth investments in order to gain customer satisfaction and loyalty. As a result, not profitable investments might be avoided, which could contribute to the growing competitiveness of e-business.

  16. Psychological and physical dimensions explaining life satisfaction among the elderly: a structural model examination.

    Science.gov (United States)

    Meléndez, Juan Carlos; Tomás, José Manuel; Oliver, Amparo; Navarro, Esperanza

    2009-01-01

    The aim of the present paper is to analyze the effects of psychological well-being, physical functioning and socio-demographic factors on life satisfaction. Both a bivariate and a multivariate level of analyses have been used. Finally, a structural model explaining life satisfaction has been developed and validated. With respect to bivariate relations, there was evidence of significant positive relations between psychological well-being dimensions and life satisfaction and between physical conditions and life satisfaction as well. Also, as age increased there was a slow decrease in life satisfaction. Educational level was positively related to life satisfaction. A structural model gave valuable information about the pattern of multivariate relationships among the variables. A first result of the model was the large effect of physical and psychological well-being on life satisfaction, albeit it was psychological well-being the major predictor of life satisfaction. A second result was that the effects of socio-demographic variables on life satisfaction were low and they operated through the effects that maintain either on psychological well-being (or its individual indicators) or on physical conditions. The role gender or age played was indirect rather than direct.

  17. A Causal Model of Life Satisfaction among the Elderly.

    Science.gov (United States)

    Markides, Kyriakos S.; Martin, Harry W.

    1979-01-01

    Predictor variables examined are self-reported health, income, education, and an activity index. Health and activity emerge as strong predictors of life satisfaction, while income influences life satisfaction indirectly via activity. The importance of investigating direct and indirect effects of variables via path analysis is discussed. (Author)

  18. A model following variable stability system for the NASA ARC X-14B.

    Science.gov (United States)

    Gallagher, J. T.; Saworotnow, I.; Seemann, R.; Gossett, T. D.

    1972-01-01

    A description of the basic design concept, hardware design, and flight evaluation of a Variable Stability System (VSS) installed on the NASA ARC X-14B is presented. The NASA ARC X-14B is a twin-engine, single-seated VTOL aircraft. The VSS is unique in that it employs a general purpose airborne digital computer as an integral part of the hybrid model following flight control system. The system design, analysis and testing phases are discussed in the paper from the application of optimal control techniques in the preliminary design of the system, through the flight demonstration of the VSS hardware.

  19. The modeling of heat affected zone (HAZ in submerged arc welding (SAW surfacing steel element

    Directory of Open Access Journals (Sweden)

    J. Winczek

    2016-04-01

    Full Text Available In the work the bimodal heat source model in the description of the temperature field is presented. The electric arc was treated physically as one heat source, whose heat was divided: part of the heat is transferred by the direct impact of the electric arc, but another part of the heat is transferred to the weld by the melted material of the electrode. Computations of the temperature field during SAW surfacing of S355 steel element are carried out. The macrographic and metallographic analysis of the weld confirmed the depth and shapes of the fusion line and HAZ defined by the numerical simulation.

  20. Recovery orientation of treatment, consumer empowerment, and satisfaction with services: a mediational model.

    Science.gov (United States)

    Barrett, Blake; Young, M Scott; Teague, Gregory B; Winarski, James T; Moore, Kathleen A; Ochshorn, Ezra

    2010-01-01

    This study explores the relationship between the recovery orientation of treatment and subjective experiences of consumer empowerment and satisfaction with services for individuals with severe and persistent mental illness. Instruments measuring perceptions of empowerment, recovery orientation of treatment, and satisfaction with services were administered to 45 participants enrolled in two demographically similar mental health treatment programs in Tampa, Florida - a community mental health center and an Assertive Community Treatment team. Analyses were conducted according to traditional mediation models. Empowerment was expected to mediate the relationship between the recovery orientation of treatment and consumer satisfaction with services. A recovery-based treatment orientation significantly predicted both consumer empowerment and satisfaction with services. Empowerment mediated the relationship between treatment orientation and consumer satisfaction. These preliminary findings highlight the impact of the recovery orientation of treatment on empowerment and satisfaction with services among individuals with severe and persistent mental illness.

  1. Five-factor model of personality and job satisfaction: a meta-analysis.

    Science.gov (United States)

    Judge, Timothy A; Heller, Daniel; Mount, Michael K

    2002-06-01

    This study reports results of a meta-analysis linking traits from the 5-factor model of personality to overall job satisfaction. Using the model as an organizing framework, 334 correlations from 163 independent samples were classified according to the model. The estimated true score correlations with job satisfaction were -.29 for Neuroticism, .25 for Extraversion, .02 for Openness to Experience, .17 for Agreeableness, and .26 for Conscientiousness. Results further indicated that only the relations of Neuroticism and Extraversion with job satisfaction generalized across studies. As a set, the Big Five traits had a multiple correlation of .41 with job satisfaction, indicating support for the validity of the dispositional source of job satisfaction when traits are organized according to the 5-factor model.

  2. How are organisational climate models and patient satisfaction related? A competing value framework approach.

    Science.gov (United States)

    Ancarani, Alessandro; Di Mauro, Carmela; Giammanco, Maria Daniela

    2009-12-01

    Patient satisfaction has become an important indicator of process quality inside hospitals. Even so, the improvement of patient satisfaction cannot simply follow from the implementation of new incentives schemes and organisational arrangements; it also depends on hospitals' cultures and climates. This paper studies the impact of alternative models of organisational climate in hospital wards on patient satisfaction. Data gathered from seven public hospitals in Italy are used to explore this relationship. The theoretical approach adopted is the Competing Value Framework which classifies organisations according to their inward or outward focus and according to the importance assigned to control vs. flexibility. Results show that both a model stressing openness, change and innovation and a model emphasising cohesion and workers' morale are positively related to patient satisfaction, while a model based on managerial control is negatively associated with patient satisfaction.

  3. Structural equation modelling of determinants of customer satisfaction of mobile network providers: Case of Kolkata, India

    Directory of Open Access Journals (Sweden)

    Shibashish Chakraborty

    2014-12-01

    Full Text Available The Indian market of mobile network providers is growing rapidly. India is the second largest market of mobile network providers in the world and there is intense competition among existing players. In such a competitive market, customer satisfaction becomes a key issue. The objective of this paper is to develop a customer satisfaction model of mobile network providers in Kolkata. The results indicate that generic requirements (an aggregation of output quality and perceived value, flexibility, and price are the determinants of customer satisfaction. This study offers insights for mobile network providers to understand the determinants of customer satisfaction.

  4. Thermodynamic Modeling of Zinc Speciation in Electric Arc Furnace Dust

    Science.gov (United States)

    Pickles, Chris A.

    2011-04-01

    The remelting of automobile scrap, containing galvanized steel, in an electric arc furnace (EAF) results in the generation of a dust, which contains considerable amounts of zinc and other metals. Typically, the amount of zinc is of significant commercial value, but the recovery of this metal can be hindered by the varied speciation of zinc. The majority of the zinc exists as zincite (ZnO) and zinc ferrite (ZnFe2O4) or ferritic spinels ((Zn x Mn y Fe1-x-y )Fe2O4), but other zinccontaining species such as zinc chloride, zinc hydroxide chlorides, hydrated zinc sulphates and zinc silicates have also been identified. There is a scarcity of research literature on the thermodynamic aspects of the formation of these zinc-containing species, in particular, the minor zinc-containing species. Therefore, in this study, the equilibrium module of HSC Chemistry® 6.1 was utilized to calculate the types and the amounts of the zinc-containing species. The variables studied were: the gas composition, the temperature and the dust composition. At high temperatures, zincite forms via the reaction of zinc vapour with oxygen gas and the zinc-manganese ferrites form as a result of the reaction of iron-manganese particles with zinc vapour and oxygen. At intermediate temperatures, zinc sulphates are produced through the reaction of zinc oxide and sulphur dioxide gas. As room temperature is approached, zinc chlorides and fluorides form by the reaction of zinc oxide with hydrogen chloride and hydrogen fluoride gases, respectively. Zinc silicate likely forms via the high temperature reaction of zinc vapour and oxygen with silica. In the presence of excess water and as room temperature is approached, the zinc sulphates, chlorides and fluorides can become hydrated.

  5. Sheared magnetospheric plasma flows and discrete auroral arcs: a quasi-static coupling model

    Directory of Open Access Journals (Sweden)

    M. M. Echim

    2007-02-01

    Full Text Available We consider sheared flows in magnetospheric boundary layers of tangential discontinuity type, forming a structure that is embedded in a large-scale convergent perpendicular electric field. We construct a kinetic model that couples the magnetospheric structure with the topside ionosphere. The contribution of magnetospheric electrons and ionospheric electrons and ions is taken into account into the current-voltage relationship derived for an electric potential monotonically decreasing with the altitude. The solution of the current continuity equation gives the distribution of the ionospheric potential consistent with the given magnetospheric electric potential. The model shows that a sheared magnetospheric flow generates current sheets corresponding to upward field-aligned currents, field-aligned potential drops and narrow bands of precipitating energy, as in discrete auroral arcs. Higher velocity magnetospheric sheared flows have the tendency to produce brighter and slightly broader arcs. An increase in arc luminosity is also associated with enhancements of magnetospheric plasma density, in which case the structures are narrower. Finally, the model predicts that an increase of the electron temperature of the magnetospheric flowing plasma corresponds to slightly wider arcs but does not modify their luminosity.

  6. Nitrogen Fixation by Gliding Arc Plasma: Better Insight by Chemical Kinetics Modelling.

    Science.gov (United States)

    Wang, Weizong; Patil, Bhaskar; Heijkers, Stjin; Hessel, Volker; Bogaerts, Annemie

    2017-05-22

    The conversion of atmospheric nitrogen into valuable compounds, that is, so-called nitrogen fixation, is gaining increased interest, owing to the essential role in the nitrogen cycle of the biosphere. Plasma technology, and more specifically gliding arc plasma, has great potential in this area, but little is known about the underlying mechanisms. Therefore, we developed a detailed chemical kinetics model for a pulsed-power gliding-arc reactor operating at atmospheric pressure for nitrogen oxide synthesis. Experiments are performed to validate the model and reasonable agreement is reached between the calculated and measured NO and NO2 yields and the corresponding energy efficiency for NOx formation for different N2 /O2 ratios, indicating that the model can provide a realistic picture of the plasma chemistry. Therefore, we can use the model to investigate the reaction pathways for the formation and loss of NOx . The results indicate that vibrational excitation of N2 in the gliding arc contributes significantly to activating the N2 molecules, and leads to an energy efficient way of NOx production, compared to the thermal process. Based on the underlying chemistry, the model allows us to propose solutions on how to further improve the NOx formation by gliding arc technology. Although the energy efficiency of the gliding-arc-based nitrogen fixation process at the present stage is not comparable to the world-scale Haber-Bosch process, we believe our study helps us to come up with more realistic scenarios of entering a cutting-edge innovation in new business cases for the decentralised production of fertilisers for agriculture, in which low-temperature plasma technology might play an important role. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  7. Examining a model of dispositional mindfulness, body comparison, and body satisfaction

    NARCIS (Netherlands)

    Dijkstra, Pieternel; Barelds, Dick P. H.

    2011-01-01

    The present study examined the links between dispositional mindfulness, body comparison, and body satisfaction. It was expected that mindfulness would be associated with less body comparison and more body satisfaction. Two models were tested: one exploring body comparison as a mediator between mindf

  8. Examining a model of dispositional mindfulness, body comparison, and body satisfaction

    NARCIS (Netherlands)

    Dijkstra, Pieternel; Barelds, Dick P. H.

    2011-01-01

    The present study examined the links between dispositional mindfulness, body comparison, and body satisfaction. It was expected that mindfulness would be associated with less body comparison and more body satisfaction. Two models were tested: one exploring body comparison as a mediator between mindf

  9. Modelling and Managing Learner Satisfaction: Use of Learner Feedback to Enhance Blended and Online Learning Experience

    Science.gov (United States)

    Li, Nai; Marsh, Vicky; Rienties, Bart

    2016-01-01

    A key concern for most institutions and instructors is whether students are satisfied with their learning experience. However, relatively few studies have unpacked what the key drivers for learner satisfaction are in blended and online courses. Using logistical regression modelling, learner satisfaction data of 62,986 learners in 401 undergraduate…

  10. Examining a model of dispositional mindfulness, body comparison, and body satisfaction

    NARCIS (Netherlands)

    Dijkstra, Pieternel; Barelds, Dick P. H.

    The present study examined the links between dispositional mindfulness, body comparison, and body satisfaction. It was expected that mindfulness would be associated with less body comparison and more body satisfaction. Two models were tested: one exploring body comparison as a mediator between

  11. Simulation of Fault Arc Based on Different Radiation Models in a Closed Tank

    Science.gov (United States)

    Li, Mei; Zhang, Junpeng; Hu, Yang; Zhang, Hantian; Wu, Yifei

    2016-05-01

    This paper focuses on the simulation of a fault arc in a closed tank based on the magneto-hydrodynamic (MHD) method, in which a comparative study of three radiation models, including net emission coefficients (NEC), semi-empirical model based on NEC as well as the P1 model, is developed. The pressure rise calculated by the three radiation models are compared to the measured results. Particularly when the semi-empirical model is used, the effect of different boundary temperatures of the re-absorption layer in the semi-empirical model on pressure rise is concentrated on. The results show that the re-absorption effect in the low-temperature region affects radiation transfer of fault arcs evidently, and thus the internal pressure rise. Compared with the NEC model, P1 and the semi-empirical model with 0.7pressure rise of the fault arc, where is an adjusted parameter involving the boundary temperature of the re-absorption region in the semi-empirical model. supported by National Key Basic Research Program of China (973 Program) (No. 2015CB251002), National Natural Science Foundation of China (Nos. 51221005, 51177124), the Fundamental Research Funds for the Central Universities, the Program for New Century Excellent Talents in University and Shaanxi Province Natural Science Foundation of China (No. 2013JM-7010)

  12. Simulation of Fault Arc Based on Different Radiation Models in a Closed Tank

    Institute of Scientific and Technical Information of China (English)

    LI Mei; ZHANG Junpeng; HU Yang; ZHANG Hantian; WU Yifei

    2016-01-01

    This paper focuses on the simulation of a fault arc in a closed tank based on the magneto-hydrodynamic (MHD) method,in which a comparative study of three radiation models,including net emission coefficients (NEC),semi-empirical model based on NEC as well as the P1 model,is developed.The pressure rise calculated by the three radiation models are compared to the measured results.Particularly when the semi-empirical model is used,the effect of different boundary temperatures of the re-absorption layer in the semi-empirical model on pressure rise is concentrated on.The results show that the re-absorption effect in the low-temperature region affects radiation transfer of fault arcs evidently,and thus the internal pressure rise.Compared with the NEC model,P1 and the semi-empirical model with 0.7 < α < 0.83 are more suitable to calculate the pressure rise of the fault arc,where is an adjusted parameter involving the boundary temperature of the re-absorption region in the semi-empirical model.

  13. Order Reduction of the Radiative Heat Transfer Model for the Simulation of Plasma Arcs

    CERN Document Server

    Fagiano, Lorenzo

    2015-01-01

    An approach to derive low-complexity models describing thermal radiation for the sake of simulating the behavior of electric arcs in switchgear systems is presented. The idea is to approximate the (high dimensional) full-order equations, modeling the propagation of the radiated intensity in space, with a model of much lower dimension, whose parameters are identified by means of nonlinear system identification techniques. The low-order model preserves the main structural aspects of the full-order one, and its parameters can be straightforwardly used in arc simulation tools based on computational fluid dynamics. In particular, the model parameters can be used together with the common approaches to resolve radiation in magnetohydrodynamic simulations, including the discrete-ordinate method, the P-N methods and photohydrodynamics. The proposed order reduction approach is able to systematically compute the partitioning of the electromagnetic spectrum in frequency bands, and the related absorption coefficients, tha...

  14. LEO high voltage solar array arcing response model. Interim report, February 1987

    Energy Technology Data Exchange (ETDEWEB)

    Metz, R.N.

    1987-02-01

    A series of mathematical models were developed that describe the electrical behavior of a large solar cell array floating electrically in the low Earth orbit (LEO) space plasma and struck by an arc at a point of negative bias. There are now three models in this series: ARCII, which is a fully analytical, linearized model; ARCIII, which is an extension of ARCIII that includes solar cell inductance as well as load reactance; Nonlinear ARC, which is a numerical model able to treat effects such as non-linearized, i.e., logarithmic solar cell I/V characteristics, conductance switching as a solar cell crosses plasma ground on a voltage excursion and non-ohmic plasma leakage current collection.

  15. Application of Extended Kalman Filter to the Modeling of Electric Arc Furnace for Power Quality Issues

    Institute of Scientific and Technical Information of China (English)

    JIN Zhi-jian; WANG Feng-hua; ZHU Zi-shu

    2007-01-01

    Electric arc furnaces (EAFs) represent one of the most disturbing loads in the subtransmission or transmission electric power systems. Therefore, it is necessary to build a practical model to descript the behavior of EAF in the simulation of power system for power quality issues. This paper deals with the modeling of EAF based on the combination of extended Kalman filter to identify the parameter of arc current and the power balance equation to obtain the dynamic, multi-valued u-i characteristics of EAF load. The whole EAF systems are simulated by means of power system blockset in Matlab to validate the proposed EAF model. This model can also be used to assess the impact of the new plant or highly varying nonlinear loads that exhibit chaos in power systems.

  16. Arc Statistics

    CERN Document Server

    Meneghetti, M; Dahle, H; Limousin, M

    2013-01-01

    The existence of an arc statistics problem was at the center of a strong debate in the last fifteen years. With the aim to clarify if the optical depth for giant gravitational arcs by galaxy clusters in the so called concordance model is compatible with observations, several studies were carried out which helped to significantly improve our knowledge of strong lensing clusters, unveiling their extremely complex internal structure. In particular, the abundance and the frequency of strong lensing events like gravitational arcs turned out to be a potentially very powerful tool to trace the structure formation. However, given the limited size of observational and theoretical data-sets, the power of arc statistics as a cosmological tool has been only minimally exploited so far. On the other hand, the last years were characterized by significant advancements in the field, and several cluster surveys that are ongoing or planned for the near future seem to have the potential to make arc statistics a competitive cosmo...

  17. Characteristics analyzing and parametric modeling of the arc sound in CO2 GMAW for on-line quality monitoring

    Institute of Scientific and Technical Information of China (English)

    Ma Yuezhou; Ma Wenbin; Qu Min; Chen Jianhong

    2006-01-01

    For on-line monitoring of welding quality, the characteristics of the arc sound signals in short circuit CO2 GMAW were analyzed in the time and frequency domains. The arc sound presents a series of ringing-like oscillations that occur at the end of short circuit i. e. the moment of arc re-ignition, and distributes mainly in the frequency band below 10 kHz. A concept of the arc tone channel and its equivalent electrical model were suggested, which is considered a time-dependent distributed parametric system of which the transmission properties depend upon the geometric and physical characteristics of the arc and surroundings, and is excited by the sound source results from the change of arc energy so that results in arc sound. The linear prediction coding ( LPC) model is an estimation of the tone channel. The radial basis function ( RBF) neural networks were built for on-line pattern recognition of the gas-lack in welding, in which the input vectors were formed with the LPC coefficients. The test results proved that the LPC model of arc sound and the RBF networks are feasible in on-line quality monitoring.

  18. Satisfaction assessment with malleable prosthetic implant of Spectra (AMS) and Genesis (Coloplast) models.

    Science.gov (United States)

    Casabé, A R; Sarotto, N; Gutierrez, C; Bechara, A J

    2016-11-01

    The malleable prosthetic implant is widely accepted among patients and physicians owing to a lower degree of surgical complexity, its rare mechanic failures and lower cost. We have compared the degree of satisfaction with malleable prosthetic implant in 60 patients, 36 with Spectra (AMS) and 24 with Genesis (Coloplast). For assessment purposes, we implemented the Erectile Dysfunction Inventory of Treatment Satisfaction (EDITS) satisfaction questionnaire adapted for penile prosthetic implants. The mean age and follow-up was 61.7 years (31-82) and 19.9 months (1-61), respectively. Mean EDITS scores did not indicate superiority of one implant over the other, overall satisfaction index being 77.1% and 75.6% for Genesis and Spectra prosthesis, respectively (P=0.4970). Our results revealed that these two models of malleable prostheses present a high level of satisfaction and confirm that the malleable prosthetic implant is an excellent option to treat patients with ED refractory to medical treatment.

  19. A Three Step B2B Sales Model Based on Satisfaction Judgments

    DEFF Research Database (Denmark)

    Grünbaum, Niels Nolsøe

    2015-01-01

    . The insights produces can be applied for selling companies to craft close collaborative customer relationships in a systematic a d efficient way. The process of building customer relationships will be guided through actions that yields higher satisfaction judgments leading to loyal customers and finally......This paper aims to provide a coherent, detailed and integrative understanding of the mental processes (i.e. dimensions) that industrial buyers apply when forming satisfaction judgments in adjacent to new task buying situations. A qualitative inductive research strategy is utilized in this study...... companies’ perspective. The buying center members applied satisfaction dimension when forming satisfaction judgments. Moreover, the focus and importance of the identified satisfaction dimensions fluctuated pending on the phase of the buying process. Based on the findings a three step sales model is proposed...

  20. Customer satisfaction and consumer responsibility: toward an alternative model of medical service quality.

    Science.gov (United States)

    Pinto, M B; Barber, J C

    1999-01-01

    In the increasingly competitive environment of medical services and patient care, physicians feel a strong pressure for increasing efforts to improve patient satisfaction with the goal of creating a loyal patient base. These steps to promote patient satisfaction have typically involved developing new programs and services, as medical offices seek to attract and keep their patients by continually enhancing service features. While patient satisfaction is a worthy goal, this paper argues that we often make mistakes and incur expensive costs in pursuing satisfaction as an end unto itself. This paper proposes an alternative model, based on creating a doctor-patient therapeutic alliance which has the dual benefits of enhancing patient satisfaction while improving the critical personal relationship between doctors and their patients, so necessary for the delivery of optimal care.

  1. A new extension of dynamic simplex model for the public transport customer satisfaction

    Directory of Open Access Journals (Sweden)

    Cristina Bernini

    2013-05-01

    Full Text Available The dynamic analysis of Customer Satisfaction is particularly useful for monitoring either customer satisfaction over time or customer behaviour reaction to company strategies, and therefore for measuring their effectiveness and efficiency. In the paper we address the following questions: does the level of customer satisfaction change over time? If yes, which factors might explain these differences? Does customer expectation influence the overall satisfaction over time? In order to answer to these questions, we propose a new extended dynamic version of LISREL model and we evaluate its performance on pseudo-panel data, built on the Customer Satisfaction of Tram Surveys conducted by the Faculty of Statistical Sciences for the Tram Agency of public transport in Rimini in the period 2000 to 2004.

  2. The European customer satisfaction index model: an application to the international hotel

    Directory of Open Access Journals (Sweden)

    Şirvan Şen Demir

    2012-04-01

    Full Text Available The purposes of this study are (1 to analyze the influence of corporate image, customer expectations, perceived quality and value on customer satisfaction and (2 to examine the relationship between customer satisfaction and customer loyalty. Through conducting a face-to-face interview, a total of 381 questionnaires were collected from tourists who were citizens of countries in European Union and stayed at international five-star hotels in Istanbul and Ankara. Structural Equation Modeling (SEM indicates a remarkable result that the latent factors (corporate image and customer expectations have a significant and positive influence on perception of quality-value and customer satisfaction, and positive relation between customer satisfaction and customer loyalty. As a result, the findings indicate that all factors have a significant correlation with each other. The findings are very important for the customer satisfaction.

  3. Neptune's ring arcs: VLT/NACO near-infrared observations and a model to explain their stability

    Science.gov (United States)

    Renner, S.; Sicardy, B.; Souami, D.; Carry, B.; Dumas, C.

    2014-03-01

    Context. Neptune's incomplete ring arcs have been stable since their discovery in 1984 although these structures should be destroyed in a few months through differential Keplerian motion. Regular imaging data are needed to address the question of the arc stability. Aims: We present the first NACO observations of Neptune's ring arcs taken at 2.2 μm (Ks band) with the Very Large Telescope in August 2007, and propose a model for the arc stability based on co-orbital motion. Methods: The images were aligned using the ephemerides of the satellites Proteus and Triton and were suitably co-added to enhance ring or satellite signals. Resonance theory and N-body simulations were used to model the arcs' confinement. Results: We derive accurate mean motion values for the arcs and Galatea and confirm the mismatch between the arcs' position and the location of the 42:43 corotation inclination resonance. We propose a new confinement mechanism where small co-orbital satellites in equilibrium trap ring arc material. We constrain the masses and locations of these hypothetical co-orbital bodies. Collected at the European Southern Observatory, Paranal, Chile - 079.C-0682.

  4. Chignik, Alaska 1 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  5. CFD modeling of an arc-heated jet

    Science.gov (United States)

    Rostand, Phillipe; Mac Cormack, Robert W.

    1990-06-01

    On the basis of state-of-the-art numerical techniques and physical models, a new CFD program is developed for the simulation of a high-enthalpy reacting ionized thermally relaxing nitrogen plasma in a cylindrical plenum chamber. A preliminary validation by comparison with experimental results was obtained. The algorithm is shown to be very efficient, and the empirical modeling gave results of practical use for the configuration studied.

  6. Customer Satisfaction Index Model on Three Level Of Socioeconomic Status In Bogor Case Study: Customer Satisfaction on Branded Cooking Oil Product

    Directory of Open Access Journals (Sweden)

    Budi Setiawan

    2014-06-01

    Full Text Available Customer satisfaction index models have been developed in many countries, including Indonesia. Those models were commonly not focused on the socioeconomic status (SES of the customer, sothis condition could be a research gap. The aims of this research is to analyze the customer satisfaction index model of branded cooking oil product in Bogor, Indonesia based on SES established from the household monthly routine consumption. Questionnaires were used as primary data collection instrument in this study, while data analysis was carried out with variance based structural equation modeling (SEM which is also known as Partial Least Square (PLS model, and Kruskall Wallis nonparametric test. Perceived quality, perceived value and customer expectation as were significantly influencing the customer satisfaction construct in the structural model. This study also concluded that there is different level of overall customer satisfaction on the three levels of customer’s SES

  7. Numerical modeling of high-voltage circuit breaker arcs and their interraction with the power system

    Science.gov (United States)

    Orama, Lionel R.

    In this work the interaction between series connected gas and vacuum circuit breaker arcs has been studied. The breakdown phenomena in vacuum interrupters during the post arc current period have been of special interest. Numerical models of gas and vacuum arcs were developed in the form of black box models. Especially, the vacuum post arc model was implemented by combining the existing transition model with an ion density function and expressions for the breakdown mechanisms. The test series studied reflect that for electric fields on the order of 10sp7V/m over the anode, the breakdown of the vacuum gap can result from a combination of both thermal and electrical stresses. For a particular vacuum device, the vacuum model helps to find the interruption limits of the electric field and power density over the anode. The series connection of gas and vacuum interrupters always performs better than the single gas device. Moreover, to take advantage of the good characteristics of both devices, the time between the current zero crossing in each interrupter can be changed. This current zero synchronization is controlled by changing the capacitance in parallel to the gas device. This gas/vacuum interrupter is suitable for interruption of very stressful short circuits in which the product of the dI/dt before current zero and the dV/dt after current zero is very high. Also, a single SF6 interrupter can be replaced by an air circuit breaker of the same voltage rating in series with a vacuum device without compromising the good performance of the SF6 device. Conceptually, a series connected vacuum device can be used for high voltage applications with equal distribution of electrical stresses between the individual interrupters. The equalization can be made by a sequential opening of the individual contact pairs, beginning with the interruptors that are closer to ground potential. This could eliminate the use of grading capacitors.

  8. An Experiential Learning Perspective on Students’ Satisfaction Model in a Flipped Classroom Context

    National Research Council Canada - National Science Library

    Xuesong Zhai; Jibao Gu; Hefu Liu; Jyh-Chong Liang; Chin-Chung Tsai

    2017-01-01

    ...’ perceptions of flipped settings. In order to fill this gap, in this study, a students’ satisfaction model for the flipped classroom was constructed based on the experiential learning theory...

  9. Influence of the gas flow rate on the nonchemical equilibrium N2 arc behavior in a model nozzle circuit breaker

    Science.gov (United States)

    Wu, Yi; Sun, Hao; Tanaka, Yasunori; Tomita, Kentaro; Rong, Mingzhe; Yang, Fei; Uesugi, Yoshihiko; Ishijima, Tatsuo; Wang, Xiaohua; Feng, Ying

    2016-10-01

    The influence of the gas flow rate on the N2 arc behavior was investigated based on a previously established nonchemical equilibrium (non-CE) model. This numerical non-CE model was adopted in the N2 nozzle arc in a model circuit breaker. The arc behaviors of both the arc burning and arc decay phases were obtained at different gas flow rates in both the non-CE and local thermal equilibrium (LTE) model. To better understand the influence of the gas flow rate, in this work we devised the concept of the nonequilibrium parameter. Additionally, the influences of convection, diffusion, and chemical reactions were examined separately to determine which one contributed most to the non-CE behavior. Finally, laser Thomson scattering (LTS) measurements at different gas flow rates were adopted to further demonstrate the validity of the non-CE model. The results of the macroscopic behaviors indicate that the deviations between the non-CE and LTE models during the arc burning phase are much fewer than those during the arc decay phase. By the nonequilibrium parameters, it clearly indicates that with an increase in the gas flow rate, the non-CE effect will be greatly enhanced. During the arc burning phase, this non-CE effect is mainly caused by radial diffusion of the particles. During the arc decay phase, for the charged particles, the chemical reactions had the greatest effect on the time variations of the particle number densities; however, for the neutral particles the time variations of the number densities were mutually influenced by convections, diffusions, and chemical reactions. Finally, the LTS results further demonstrate the validity of the non-CE model at different gas flow rates.

  10. Relationship Model of Personality, Communication, Student Engagement, and Learning Satisfaction

    Directory of Open Access Journals (Sweden)

    Dorothea Ariani

    2015-12-01

    Full Text Available This study aims to examine the engagement as a mediating variable of the relationship between personality and communication with satisfaction. This study was conducted at business school in Indonesia with 307 students who are still active as a respondent. Survey research was conducted over four months by questionnaire that has been well-established that was taken and modified from previous studies. The results of this study indicate that student engagement mediates the relationship between personality and communication as independent variables and satisfaction as the dependent variable. Extroversion personality and communication significantly positive effect on student engagement in all three dimensions (vigor, dedication, and absorption. In addition, this study also showed that engagement and satisfaction are two different variables, but correlated, and there was no difference in terms of gender differences involvement.

  11. European model of satisfaction: a case study with students from a Higher Education Instituition

    Directory of Open Access Journals (Sweden)

    Everton Anger Cavalheiro

    2014-06-01

    Full Text Available This study aimed to evaluate the overall satisfaction determinants of the student’s body of a higher education institution in the northwest of Rio Grande do Sul/Brasil. To do so, a descriptive quantitative research was performed, which used a model based on a Survey with 402 students, being the instrument used to conduct the survey based on the European model of satisfaction. Represented by a structural equation (PASWAN YOUNG, 2002, apud VIEIRA et al., 2008, the ECSI (European Customer Satisfaction Model, focuses on: (i evaluating the influence of perceived quality, the expectation of quality, image and perceived value in the overall student satisfaction; (II evaluating the influence of the general satisfaction of students in the level of loyalty and retention of students in the educational institution, and (III pointing key areas as well as a set of indicators for the management and maintenance of the students’ satisfaction from the institution being analyzed. Thus, with the application of the instrument, three factors able to explain 78% of student’s satisfaction towards the university were found: the first and most representative factor was called the student perceived value, which is the perceived value or level of teaching quality for the price paid by the students, the second factor is the image of the university, and the third factor are the expectations of the student.

  12. The ARCS (Attention, Relevant, Confidence & Satisfaction) Model of Motivational Strategies for Course Designers and Developers.

    Science.gov (United States)

    1982-09-01

    or big droplets). With the gauge controls, you have to control (1) rate, (2) temperature, and (3) pressure. However, there is one important...a5 "the central processing unit of a computer is like the brain in a human being. It coordinates data .nput, as the brain does nervous signals from...here bec,’,se the stratgies Fig,,re 6.6 , .,o.anize-z according to tneir r.. I t .cir pu-acu -- the course. It IWrL selection and the way, .ucn. easier

  13. Modeling Plasma-Particle Interaction in Multi-Arc Plasma Spraying

    Science.gov (United States)

    Bobzin, K.; Öte, M.

    2017-01-01

    The properties of plasma-sprayed coatings are controlled by the heat, momentum, and mass transfer between individual particles and the plasma jet. The particle behavior in conventional single-arc plasma spraying has been the subject of intensive numerical research, whereas multi-arc plasma spraying has not yet received the same attention. We propose herein a numerical model to serve as a scientific tool to investigate particle behavior in multi-arc plasma spraying. In the Lagrangian description of particles in the model, the mathematical formulations describing the heat, momentum, and mass transfer are of great importance for good predictive power, so such formulations proposed by different authors were compared critically, revealing that different mathematical formulations lead to significantly different results. The accuracy of the different formulations was evaluated based on theoretical considerations, and those found to be more accurate were implemented in the final model. Furthermore, a mathematical formulation is proposed to enable simplified calculation of partial particle melting and resolidification.

  14. Dry hyperbaric gas metal arc welding of subsea pipelines: experiments and modeling

    Energy Technology Data Exchange (ETDEWEB)

    Azar, Amin S.

    2012-07-01

    welding parameters. The datasets are representing the effects of using pure argon under 14 incrementally increased pressure levels. Fast Fourier Transformation (FFT) is used to characterize the frequency domain of the waveforms. Auto-correlation Function (AF) and Power Spectral Density (PSD) were calculated assuming the Wiener-Khinchin theorem. Considering the AF, it is possible to visualize the deteriorating stability of the arc. The rate of stability degradation is quite gentle after 20 bar, though, huge differences were observed from 1 to 20 bar. The characteristic frequencies of 100-150 Hz and 350-400 Hz were observed. The first range can be associated with the mass transfer or molten droplet launch frequency and the latter range is representative of the rectified mains. The spread of large low-frequency peaks at higher pressures is illustrating the mass transfer deterioration. The aforementioned peaks were found above 125 bar where the range of the characteristic frequency peaks in voltage and current waveforms started to deviate. The calculated arc power is higher at high-pressure range while the weld bead geometry was barely varied. It implies that the arc efficiency factor decreases at high pressures.The heat source dimensions and heat efficiency factor are two major inputs for finite element (FE) simulations of the weld. However, a systematic classification of these factors was hardly available prior to this work. Additionally, to the best of author's knowledge, the direct high-speed observation of the arc inside the hyperbaric welding chamber has not been investigated in detail by far due to several technological issues. The varying bead-on-plate welds including the end crater appearance can possibly be good candidates to categorize the FE heat source dimensions. Double-ellipsoidal heat source (Goldak's Model) was implemented in WeldSimS R FE code that is used in this study. Since the model incorporates two superimposed reference heat sources, the

  15. NOTE: The impact of treatment couch modelling on RapidArc

    Science.gov (United States)

    Vanetti, Eugenio; Nicolini, Giorgia; Clivio, Alessandro; Fogliata, Antonella; Cozzi, Luca

    2009-05-01

    A planning and dosimetric study was carried out on a cohort of six CT datasets from patients treated for prostate cancer to assess the impact of couch modelling on the accuracy of dose calculation for the volumetric modulated arc technique RapidArc. For each patient, RapidArc plans were optimized using the couch while final dose calculation was performed with different conditions (thin, medium, thick and no couch). Analysis was performed in terms of dose volume histograms, dose difference histograms and 3D-γ tests. Pre-treatment verification measurements were performed using the PTW-729 array in conjunction with the Octavius phantom (PTW, Freiburg); similarly, HU characterization of couch was performed with the same phantom and ion chamber measurements comparing calculations and experimental data. A set of Hounsfield Units (HU) valid for low and high energy and the entire couch length was found as internal structure HU = -960, surface shell HU = -700. Analysis of dose plans showed that differences larger than 1.5 Gy for a 70 Gy prescription might be observed on significant fractions of PTVs. Smaller differences are visible in the medium low-dose regions. Pre-treatment verification on composite delivery confirmed these observations and, at the same time, showed good accuracy of dose calculations in the presence of couch modelling compared to delivery in the same conditions (GAI ranging from 95% to 100%). Results confirmed the reliability of the geometrical model build in the planning system Eclipse, and (i) there is no measurable effect if the wrong segment of the couch is used in the calculations; (ii) there are significant discrepancies of potential clinical impact at the level of the target volumes if calculations are performed without couch and delivery is performed with couch, and (iii) the effect is particularly relevant at low energy (6 MV in this case) that is the configuration clinically used by most of the centres adopting technologies based on intensity

  16. Consumer Satisfaction, Determinants, and Post-Purchase Actions in Higher Education: A Model to Guide Academic Managers.

    Science.gov (United States)

    Pate, William S.

    1993-01-01

    Applying a consumer satisfaction model to higher education program administration provides the manager with a systemic view of satisfaction, related variables, and postpurchase (alumni) actions. By manipulating the variables leading to consumer satisfaction, the institution can satisfy its consumers and increase the likelihood the consumer will…

  17. Mathematical model and manufacture programming of loxodromic-type normal circular-arc spiral bevel gear

    Science.gov (United States)

    Duan, Zhenyun; Chen, Houjun; Ju, Zhilan; Liu, Jian

    2012-09-01

    In this paper, loxodromic-type normal circulararc spiral bevel gear is proposed as a novel application of the circular-arc tooth profile at the gear transmission with intersecting axes. Based on the principle of molding-surface conjugation, the study develops a mathematical model for the tooth alignment curve and the computational flow at the design stage to enable the generation of the tooth surface. Machining of the tooth surface is then carried out to determine the interference-free tool path of the numerical control (NC). Moreover, a pair of loxodromic-type normal circular-arc spiral bevel gears is manufactured on computer numerical control (CNC) machine tools. The proposed theory and method are experimentally investigated, and the obtained results primarily reflect the superior performance of the proposed novel gear.

  18. Evaporation Erosion During the Relay Contact Breaking Process Based on a Simplified Arc Model

    Institute of Scientific and Technical Information of China (English)

    CUI Xinglei; ZHOU Xue; ZHAI Guofu; PENG Xiyuan

    2016-01-01

    Evaporation erosion of the contacts is one of the fundamental failure mechanisms for relays.In this paper,the evaporation erosion characteristics are investigated for the copper contact pair breaking a resistive direct current (dc) 30 V/10 A circuit in the air.Molten pool simulation of thc contacts is coupled with the gas dynamics to cMculate the evaporation rate.A simplified arc model is constructed to obtain the contact voltage and current variations with time for the prediction of the current density and the heat flux distributions flowing from the arc into the contacts.The evaporation rate and mass variations with time during the breaking process are presented.Experiments are carried out to verify the simulation results.

  19. A Two-Flux Radiation Model for Helical Instability of Arcs

    Institute of Scientific and Technical Information of China (English)

    GONG Ye; ZHENG Shu; XU Xiang; ZOU Xiu; LIU Jin-Yuan; LIU Yue; WANG Xiao-Gang

    2005-01-01

    @@ A two-flux radiation model of the helical instability of arcs in axial magnetic field is presented. The temperature (and electrical conductivity) is approximated in a more realistic way (parabolic instead of flat profile) and a simplified term of radiation losses is included in the energy equation. The magnetohydrodynamic equations in an electrostatic approximation serve as the starting point of the theory. Using a linear time-dependent perturbation theory, the corresponding equations and an explicit analytic expression that corresponds to the term of radiation losses are derived in the presence of the radiation transfer energy, from which the marginal Maecker number and the growth rate of the helical instability can be given. It is found that, in comparison with the results without radiation, the arc stable area is reduced.

  20. Two Phase Analysis of Ski Schools Customer Satisfaction: Multivariate Ranking and Cub Models

    Directory of Open Access Journals (Sweden)

    Rosa Arboretti

    2014-06-01

    Full Text Available Monitoring tourists' opinions is an important issue also for companies providing sport services. The aim of this paper was to apply CUB models and nonparametric permutation methods to a large customer satisfaction survey performed in 2011 in the ski schools of Alto Adige (Italy. The two-phase data processing was mainly aimed to: establish a global ranking of a sample of five ski schools, on the basis of satisfaction scores for several specific service aspects; to estimate specific components of the respondents’ evaluation process (feeling and uncertainty and to detect if customers’ characteristics affected these two components. With the application of NPC-Global ranking we obtained a ranking of the evaluated ski schools simultaneously considering satisfaction scores of several service’s aspects. CUB models showed which aspects and subgroups were less satisfied giving tips on how to improve services and customer satisfaction.

  1. Integrated Model of Customers’ Satisfaction and Loyality: A Business Analysis of Banking Service

    Directory of Open Access Journals (Sweden)

    Rachmad Hidayat

    2016-06-01

    Full Text Available The purpose of this study is to determine the relationships of service quality, bank’s image, customer value and product quality with customer satisfaction and customer loyalty. Sample is the state-owned banks’ customers in four major cities in Indonesia. Data is analyzed by using the Structural Equation Modeling (SEM method. Results lead to an integrated model of customers’ satisfaction and loyalty. In conclusion, customer value and quality of bank products do not significantly and directly affect customer loyalty, but do significantly affect customer loyalty mediated by customer satisfaction. Service quality and bank’s image directly and indirectly affects customers’ satisfaction and loyalty. Service quality and bank’s image have the strongest and most dominant effects on customer loyalty.

  2. Investigation of Voltage Unbalance Problems In Electric Arc Furnace Operation Model

    OpenAIRE

    Yacine DJEGHADER; Hocine LABAR

    2013-01-01

    In modern steel industry, Electric Arc Furnaces are widely used for iron and scarp melting. The operation of electric arc furnace causes many power quality problems such as harmonics, unbalanced voltage and flicker. The factors that affect Electric arc furnace operation are the melting or refining materials, melting stage, electrodes position (arc length), electrode arm control and short circuit power of the feeder, so, arc voltages, current and power are defined as a nonlinear function of ar...

  3. The European customer satisfaction index model: an application to the international hotel

    OpenAIRE

    Şirvan Şen Demir

    2012-01-01

    The purposes of this study are (1) to analyze the influence of corporate image, customer expectations, perceived quality and value on customer satisfaction and (2) to examine the relationship between customer satisfaction and customer loyalty. Through conducting a face-to-face interview, a total of 381 questionnaires were collected from tourists who were citizens of countries in European Union and stayed at international five-star hotels in Istanbul and Ankara. Structural Equation Modelling (...

  4. Three-dimensional modeling of the cochlea by use of an arc fitting approach.

    Science.gov (United States)

    Schurzig, Daniel; Lexow, G Jakob; Majdani, Omid; Lenarz, Thomas; Rau, Thomas S

    2016-12-01

    A cochlea modeling approach is presented allowing for a user defined degree of geometry simplification which automatically adjusts to the patient specific anatomy. Model generation can be performed in a straightforward manner due to error estimation prior to the actual generation, thus minimizing modeling time. Therefore, the presented technique is well suited for a wide range of applications including finite element analyses where geometrical simplifications are often inevitable. The method is presented for n=5 cochleae which were segmented using a custom software for increased accuracy. The linear basilar membrane cross sections are expanded to areas while the scalae contours are reconstructed by a predefined number of arc segments. Prior to model generation, geometrical errors are evaluated locally for each cross section as well as globally for the resulting models and their basal turn profiles. The final combination of all reconditioned features to a 3D volume is performed in Autodesk Inventor using the loft feature. Due to the volume generation based on cubic splines, low errors could be achieved even for low numbers of arc segments and provided cross sections, both of which correspond to a strong degree of model simplification. Model generation could be performed in a time efficient manner. The proposed simplification method was proven to be well suited for the helical cochlea geometry. The generated output data can be imported into commercial software tools for various analyses representing a time efficient way to create cochlea models optimally suited for the desired task.

  5. Modeling treatment couches in the Pinnacle treatment planning system: Especially important for arc therapy

    Energy Technology Data Exchange (ETDEWEB)

    Duggar, William Neil, E-mail: wduggar@umc.edu [Department of Radiation Oncology, University of Mississippi Medical Center, Jackson, MS (United States); Nguyen, Alex [Ironwood Cancer and Research Center, Chandler, AZ (United States); Stanford, Jason; Morris, Bart; Yang, Claus C. [Department of Radiation Oncology, University of Mississippi Medical Center, Jackson, MS (United States)

    2016-04-01

    This study is to demonstrate the importance and a method of properly modeling the treatment couch for dose calculation in patient treatment using arc therapy. The 2 treatment couch tops—Aktina AK550 and Elekta iBEAM evo—of Elekta LINACs were scanned using Philips Brilliance Big Bore CT Simulator. Various parts of the couch tops were contoured, and their densities were measured and recorded on the Pinnacle treatment planning system (TPS) using the established computed tomography density table. These contours were saved as organ models to be placed beneath the patient during planning. Relative attenuation measurements were performed following procedures outlined by TG-176 as well as absolute dose comparison of static fields of 10 × 10 cm{sup 2} that were delivered through the couch tops with that calculated in the TPS with the couch models. A total of 10 random arc therapy treatment plans (5 volumetric-modulated arc therapy [VMAT] and 5 stereotactic body radiation therapy [SBRT]), using 24 beams, were selected for this study. All selected plans were calculated with and without couch modeling. Each beam was evaluated using the Delta{sup 4} dosimetry system (Delta{sup 4}). The Student t-test was used to determine statistical significance. Independent reviews were exploited as per the Imaging and Radiation Oncology Core head and neck credentialing phantom. The selected plans were calculated on the actual patient anatomies with and without couch modeling to determine potential clinical effects. Large relative beam attenuations were noted dependent on which part of the couch top beams were passing through. Substantial improvements were also noted for static fields both calculated with the TPS and delivered physically when the couch models were included in the calculation. A statistically significant increase in agreement was noted for dose difference, distance to agreement, and γ-analysis with the Delta{sup 4} on VMAT and SBRT plans. A credentialing review showed

  6. MODEL PEMBELAJARAN PRAKTIK PENGELASAN SHIELED METAL ARC WELDING(SMAW POSISI 1G JURUSAN TEKNIK PENGELASAN

    Directory of Open Access Journals (Sweden)

    Masri Bin Ardin

    2016-08-01

    Full Text Available Penelitian ini bertujuan untuk: (1 mendeskripsikan model pembelajaran praktik yang berlangsung atau disebut model pembelajaran regular praktek pengelasan SMAW posisi 1G di SMK Negeri 2 Pengasih; (2 mengetahui efektifitas dan mendeskripsikan bahan yang digunakan dalam praktek pengelasan SMAW posisi 1G, misalnya: besi plat, mata gerinda, elektroda, dan waktu yang digunakan selama praktek pengelasan SMAW posisi 1G. Penelitian ini merupakan penelitian deskriptif dengan teknik pengumpulan data menggunakan wawancara, dokumentasi, angket dan penilaian skill pengelasan. Asessment skill pengelasan mengacu pada Acean Skill Welding Competition. Hasil penelitian yaitu: (1 model pembelajaran praktek pengelasan SMAW posisi 1G terdiri dari 4 pertemuan teori dan 13 pertemuan praktik; (2 model pembelajaran praktik pengelasan di SMKN 2 Pengasih sudah efektif tetapi untuk rutinitas pengelasan belum efektif untuk membentuk skill pengelasan SMAW posisi 1G dengan sistem assesment Asean Skill Welding Competition. Fasilitas utama dalam praktek pengelasan SMAW posisi 1G adalah mesin las. Sementara itu SMKN 2 pengasih memiliki 6 buah mesin las dengan rasio 1 mesin las untuk 5 orang siswa. Bahan habis pakai untuk 30 orang siswa per semester yang menggunakan model pembelajaran praktek pengelasan adalah besi plat ± 100-150 kg, mata gerinda total ± 5-6 keping, elektroda ± 9-10 box dan total waktunya aktif 77 jam selama satu semester. Kata kunci: pembelajaran Praktik Pengelasan SMAW, Skill Siswa untuk Posisi 1G LEARNING MODEL OF SHIELD METAL ARC WELDING (SMAW PRACTICE OF 1G POSITION AT THE WELDING ENGINEERING DEPARTMENT Abstract This research aimed to: (1 describe the learning model of shield metal arc welding (SMAW practice of 1G position at the Welding Engineering Department of State Vocational High School (SMKN 2 Pengasih; (2 find the effectiveness and describe materials needed in the learning model of shield metal arc welding (SMAW practice of 1G position, for examples

  7. Modeling of Interstellar Scintillation Arcs from Pulsar B1133+16

    CERN Document Server

    Trang, F S; Trang, Frank S.; Rickett, Barney J.

    2007-01-01

    The parabolic arc phenomenon visible in the Fourier analysis of the scintillation spectra of pulsars provides a new method of investigating the small scale structure in the ionized interstellar medium (ISM). We report archival observations of the pulsar B1133+16 showing both forward and reverse parabolic arcs sampled over 14 months. These features can be understood as the mutual interference between an assembly of discrete features in the scattered brightness distribution. By model-fitting to the observed arcs at one epoch we obtain a ``snap-shot'' estimate of the scattered brightness, which we show to be highly anisotropic (axial ratio >10:1), to be centered significantly off axis and to have a small number of discrete maxima, which are coarser the speckle expected from a Kolmogorov spectrum of interstellar plasma density. The results suggest the effects of highly localized discrete scattering regions which subtend 0.1-1 mas, but can scatter (or refract) the radiation by angles that are five or more times la...

  8. THE PERIODIC CAPACITATED ARC ROUTING PROBLEM LINEAR PROGRAMMING MODEL,METAHEURISTIC AND LOWER BOUNDS

    Institute of Scientific and Technical Information of China (English)

    Feng CHU; Nacima LABADI; Christian PRINS

    2004-01-01

    The Periodic Capacitated Arc Routing Problem (PCARP) generalizes the well known NP-hard Capacitated Arc Routing Problem (CARP) by extending the single period to multi-period horizon.The Capacitated Arc Routing Problem (CARP) is defined on an undirected network in which a fleet of identical vehicles is based at a depot node. A subset of edges, called tasks, must be serviced by a vehicle. The CARP consists of determining a set of feasible vehicle trips that minimizes the total cost of traversed edges. The PCARP involves the assignment of tasks to periods and the determination of vehicles trips in each period, to minimize the total cost on the whole horizon. This new problem arises in various real life applications such as waste collection, mail delivery, etc. In this paper, a new linear programming model and preliminary lower bounds based on graph transformation are proposed. A meta-heuristic approach - Scatter Search (SS) is developed for the PCARP and evaluated on a large variety of instances.

  9. Radioactive waste combustion / vitrification under arc plasma: thermal and dynamic modelling; Combustion - vitrification de dechets radioactifs par plasma d'arc: modelisation de la thermique et de la dynamique

    Energy Technology Data Exchange (ETDEWEB)

    Barthelemy, B

    2003-07-01

    This thesis concerns the thermal and dynamic modelling for a combustion/vitrification process of surrogate radioactive waste under transferred arc plasma. The writer presents the confinement processes for radioactive waste using arc plasma and the different software used to model theses processes. This is followed by a description of our experimental equipment including a plasma arc reactor and an inductive system allowing the homogenization of glass temperature. A combustion/vitrification test is described. Thermal and material balances were discussed. The temperature fields of plasma arc and the glass frit conductivity are measured. Finally, the writer describes and clarifies the equations solved for the simulations of the electrically plasma arc and the glass melting including the thin layer of glass frit coating the crucible cold walls. The modelling results are presented in the form of spatial distribution of temperature, velocity and volume power... (author)

  10. Radioactive waste combustion-vitrification under arc plasma: thermal and dynamic modelling; Combustion - vitrification de dechets radioactifs par plasma d'arc: modelisation de la thermique et de la dynamique

    Energy Technology Data Exchange (ETDEWEB)

    Barthelemy, B

    2003-06-01

    This thesis concerns the thermal and dynamic modelling for a combustion/vitrification process of surrogate radioactive waste under transferred arc plasma. The writer presents the confinement processes for radioactive waste using arc plasma and the different software used to model theses processes. This is followed by a description of our experimental equipment including a plasma arc reactor and an inductive system allowing the homogenization of glass temperature. A combustion/vitrification test is described. Thermal and material balances were discussed. The temperature fields of plasma arc and the glass frit conductivity are measured. Finally, the writer describes and clarifies the equations solved for the simulations of the electrically plasma arc and the glass melting including the thin layer of glass frit coating the crucible cold walls. The modelling results are presented in the form of spatial distribution of temperature, velocity and voluminal power... (author)

  11. The Development of Writing Learning Model Based on the Arces Motivation for Students of Senior High School

    Directory of Open Access Journals (Sweden)

    Andreas Kosasih

    2014-08-01

    Full Text Available This research obtains some of the findings which in a word can be described as follows: (1 the step of Introduction (exploration: through study library and observation, it can be found that the quality of writing learning and the need of a better writing learning model, and it is formulated the prototype of writing learning model based on the ARCES motivation, serta dirumuskan prototipe model pembelajaran menulis berbasis motivasi ARCES after the draft is validated by the Indonesian language experts and education technology experts. (2 The step of model development: through development of preliminary model and development of  main model and after it is done by  monitoring, evaluation, focus group discussion and revision, then it is produced a better writing learning model based on ARCES motivation. (3 The step of model effectiveness examination: through pre-test, treatment, and post-test which is produced writing learning model  based on ARCES motivation. From the effectiveness test result of model, it can be concluded that writing learning based on ARCES motivation is more effective (in average value of post test is 83,94 than writing learning conventionally (in average value of post-test is 75,79.

  12. The European customer satisfaction index model: an application to the international hotel

    Directory of Open Access Journals (Sweden)

    Şirvan Şen Demir

    2012-04-01

    Full Text Available The purposes of this study are (1 to analyze the influence of corporate image, customer expectations, perceived quality and value on customer satisfaction and (2 to examine the relationship between customer satisfaction and customer loyalty. Through conducting a face-to-face interview, a total of 381 questionnaires were collected from tourists who were citizens of countries in European Union and stayed at international five-star hotels in Istanbul and Ankara. Structural Equation Modelling (SEM indicates a remarkable result that the latent factors (corporate image and customer expectations have a significant and positive influence on perception of quality-value and customer satisfaction, and positive relation between customer satisfaction and customer loyalty. As a result, the findings indicate that all factors have a significant correlation with each other.

  13. The Social Cognitive Model of Job Satisfaction among Teachers: Testing and Validation

    Science.gov (United States)

    Badri, Masood A.; Mohaidat, Jihad; Ferrandino, Vincent; El Mourad, Tarek

    2013-01-01

    The study empirically tests an integrative model of work satisfaction (0280, 0140, 0300 and 0255) in a sample of 5,022 teachers in Abu Dhabi in the United Arab Emirates. The study provided more support for the Lent and Brown (2006) model. Results revealed that this model was a strong fit for the data and accounted for 82% of the variance in work…

  14. The Social Cognitive Model of Job Satisfaction among Teachers: Testing and Validation

    Science.gov (United States)

    Badri, Masood A.; Mohaidat, Jihad; Ferrandino, Vincent; El Mourad, Tarek

    2013-01-01

    The study empirically tests an integrative model of work satisfaction (0280, 0140, 0300 and 0255) in a sample of 5,022 teachers in Abu Dhabi in the United Arab Emirates. The study provided more support for the Lent and Brown (2006) model. Results revealed that this model was a strong fit for the data and accounted for 82% of the variance in work…

  15. A simple arc column model that accounts for the relationship between voltage, current and electrode gap during VAR

    Energy Technology Data Exchange (ETDEWEB)

    Williamson, R.L. [Sandia National Labs., Albuquerque, NM (United States). Liquid Metal Processing Lab.

    1997-02-01

    Mean arc voltage is a process parameter commonly used in vacuum arc remelting (VAR) control schemes. The response of this parameter to changes in melting current (I) and electrode gap (g{sub e}) at constant pressure may be accurately described by an equation of the form V = V{sub 0} + c{sub 1}g{sub e}I + c{sub 2}g{sub e}{sup 2} + c{sub 3}I{sup 2}, where c{sub 1}, c{sub 2} and c{sub 3} are constants, and where the non-linear terms generally constitute a relatively small correction. If the non-linear terms are ignored, the equation has the form of Ohm`s law with a constant offset (V{sub 0}), c{sub 1}g{sub e} playing the role of resistance. This implies that the arc column may be treated approximately as a simple resistor during constant current VAR, the resistance changing linearly with g{sub e}. The VAR furnace arc is known to originate from multiple cathode spot clusters situated randomly on the electrode tip surface. Each cluster marks a point of exist for conduction electrons leaving the cathode surface and entering the electrode gap. Because the spot clusters re highly localized on the cathode surface, each gives rise to an arc column that may be considered to operate independently of other local arc columns. This approximation is used to develop a model that accounts for the observed arc voltage dependence on electrode gap at constant current. Local arc column resistivity is estimated from elementary plasma physics and used to test the model for consistency by using it to predict local column heavy particle density. Furthermore, it is shown that the local arc column resistance increases as particle density increases. This is used to account for the common observation that the arc stiffens with increasing current, i.e. the arc voltage becomes more sensitive to changes in electrode gap as the melting current is increased. This explains why arc voltage is an accurate electrode gap indicator for high current VAR processes but not low current VAR processes.

  16. Understanding the relationship between Kano model's customer satisfaction scores and self-stated requirements importance.

    Science.gov (United States)

    Mkpojiogu, Emmanuel O C; Hashim, Nor Laily

    2016-01-01

    Customer satisfaction is the result of product quality and viability. The place of the perceived satisfaction of users/customers for a software product cannot be neglected especially in today competitive market environment as it drives the loyalty of customers and promotes high profitability and return on investment. Therefore understanding the importance of requirements as it is associated with the satisfaction of users/customers when their requirements are met is worth the pain considering. It is necessary to know the relationship between customer satisfactions when their requirements are met (or their dissatisfaction when their requirements are unmet) and the importance of such requirement. So many works have been carried out on customer satisfaction in connection with the importance of requirements but the relationship between customer satisfaction scores (coefficients) of the Kano model and users/customers self-stated requirements importance have not been sufficiently explored. In this study, an attempt is made to unravel the underlying relationship existing between Kano model's customer satisfaction indexes and users/customers self reported requirements importance. The results of the study indicate some interesting associations between these considered variables. These bivariate associations reveal that customer satisfaction index (SI), and average satisfaction coefficient (ASC) and customer dissatisfaction index (DI) and average satisfaction coefficient (ASC) are highly correlated (r = 96 %) and thus ASC can be used in place of either SI or DI in representing customer satisfaction scores. Also, these Kano model's customer satisfaction variables (SI, DI, and ASC) are each associated with self-stated requirements importance (IMP). Further analysis indicates that the value customers or users place on requirements that are met or on features that are incorporated into a product influences the level of satisfaction such customers derive from the product. The

  17. Analysis of the Influence of Quantile Regression Model on Mainland Tourists’ Service Satisfaction Performance

    Directory of Open Access Journals (Sweden)

    Wen-Cheng Wang

    2014-01-01

    Full Text Available It is estimated that mainland Chinese tourists travelling to Taiwan can bring annual revenues of 400 billion NTD to the Taiwan economy. Thus, how the Taiwanese Government formulates relevant measures to satisfy both sides is the focus of most concern. Taiwan must improve the facilities and service quality of its tourism industry so as to attract more mainland tourists. This paper conducted a questionnaire survey of mainland tourists and used grey relational analysis in grey mathematics to analyze the satisfaction performance of all satisfaction question items. The first eight satisfaction items were used as independent variables, and the overall satisfaction performance was used as a dependent variable for quantile regression model analysis to discuss the relationship between the dependent variable under different quantiles and independent variables. Finally, this study further discussed the predictive accuracy of the least mean regression model and each quantile regression model, as a reference for research personnel. The analysis results showed that other variables could also affect the overall satisfaction performance of mainland tourists, in addition to occupation and age. The overall predictive accuracy of quantile regression model Q0.25 was higher than that of the other three models.

  18. Analysis of the Influence of Quantile Regression Model on Mainland Tourists' Service Satisfaction Performance

    Science.gov (United States)

    Wang, Wen-Cheng; Cho, Wen-Chien; Chen, Yin-Jen

    2014-01-01

    It is estimated that mainland Chinese tourists travelling to Taiwan can bring annual revenues of 400 billion NTD to the Taiwan economy. Thus, how the Taiwanese Government formulates relevant measures to satisfy both sides is the focus of most concern. Taiwan must improve the facilities and service quality of its tourism industry so as to attract more mainland tourists. This paper conducted a questionnaire survey of mainland tourists and used grey relational analysis in grey mathematics to analyze the satisfaction performance of all satisfaction question items. The first eight satisfaction items were used as independent variables, and the overall satisfaction performance was used as a dependent variable for quantile regression model analysis to discuss the relationship between the dependent variable under different quantiles and independent variables. Finally, this study further discussed the predictive accuracy of the least mean regression model and each quantile regression model, as a reference for research personnel. The analysis results showed that other variables could also affect the overall satisfaction performance of mainland tourists, in addition to occupation and age. The overall predictive accuracy of quantile regression model Q0.25 was higher than that of the other three models. PMID:24574916

  19. How happy is your web browsing? A probabilistic model to describe user satisfaction

    CERN Document Server

    Banerji, Anirban

    2009-01-01

    We all go through scores of web-pages everyday, in search of required information. At times we become satisfied with the content of some pages, at time we fail to. An objective framework that attempts to model the user satisfaction when he searches for some desired piece of information, is essential for Human-Computer-Interaction. In the present work, a simple probabilistic model is constructed to achieve precisely the same. This realistic yet strictly mathematical study proposes a marker, the 'satisfaction retentivity quotient', to model the complex realm of user psychology as he attempts to find required information and forgets some bits of it here and there, simultaneously.

  20. A trade-off analysis design tool. Aircraft interior noise-motion/passenger satisfaction model

    Science.gov (United States)

    Jacobson, I. D.

    1977-01-01

    A design tool was developed to enhance aircraft passenger satisfaction. The effect of aircraft interior motion and noise on passenger comfort and satisfaction was modelled. Effects of individual aircraft noise sources were accounted for, and the impact of noise on passenger activities and noise levels to safeguard passenger hearing were investigated. The motion noise effect models provide a means for tradeoff analyses between noise and motion variables, and also provide a framework for optimizing noise reduction among noise sources. Data for the models were collected onboard commercial aircraft flights and specially scheduled tests.

  1. Ethiopian Central Rift Valley basin hydrologic modelling using HEC-HMS and ArcSWAT

    Science.gov (United States)

    Pascual-Ferrer, Jordi; Candela, Lucila; Pérez-Foguet, Agustí

    2013-04-01

    An Integrated Water Resources Management (IWRM) shall be applied to achieve a sustainable development, to increase population incomes without affecting lives of those who are highly dependent on the environment. First step should be to understand water dynamics at basin level, starting by modeling the basin water resources. For model implementation, a large number of data and parameters are required, but those are not always available, especially in some developing countries where different sources may have different data, there is lack of information on data collection, etc. The Ethiopian Central Rift Valley (CRV) is an endorheic basin covering an area of approximately 10,000 km2. For the period 1996-2005, the average annual volume of rainfall accounted for 9.1 Mm3, and evapotranspiration for 8 Mm3 (Jansen et al., 2007). From the environmental point of view, basin ecosystems are endangered due to human activities. Also, poverty is widespread all over the basin, with population mainly living from agriculture on a subsistence economy. Hence, there is an urgent need to set an IWRM, but datasets required for water dynamics simulation are not too reliable. In order to reduce uncertainty of numerical simulation, two semi-distributed open software hydrologic models were implemented: HEC-HMS and ArcSWAT. HEC-HMS was developed by the United States Army Corps of Engineers (USACoE) Hydrologic Engineering Center (HEC) to run precipitation-runoff simulations for a variety of applications in dendritic watershed systems. ArcSWAT includes the SWAT (Soil and Water Assessment Tool, Arnold et al., 1998) model developed for the USDA Agricultural Research Service into ArcGIS (ESRI®). SWAT was developed to assess the impact of land management practices on large complex watersheds with varying soils, land use and management conditions over long periods of time (Neitsch et al., 2005). According to this, ArcSWAT would be the best option for IWRM implementation in the basin. However

  2. A research model of health-care competition and customer satisfaction.

    Science.gov (United States)

    Asoh, Derek A; Rivers, Patrick A

    2007-11-01

    In all industries, competition among businesses has long been encouraged as a mechanism to increase value for customers. In other words, competition ensures the provision of better products and services to satisfy the needs of customers. Various perspectives of competition, the nature of service quality, health-care system costs and customer satisfaction in health care are examined. A model of the relationship among these variables is developed. The model depicts customer satisfaction as an outcome measure directly dependent on competition. Quality of care and health-care system costs, while also directly dependent on competition, are considered as determinants of customer satisfaction as well. The model is discussed in the light of propositions for empirical research.

  3. Using a Mixed Model to Evaluate Job Satisfaction in High-Tech Industries.

    Science.gov (United States)

    Tsai, Sang-Bing; Huang, Chih-Yao; Wang, Cheng-Kuang; Chen, Quan; Pan, Jingzhou; Wang, Ge; Wang, Jingan; Chin, Ta-Chia; Chang, Li-Chung

    2016-01-01

    R&D professionals are the impetus behind technological innovation, and their competitiveness and capability drive the growth of a company. However, high-tech industries have a chronic shortage of such indispensable professionals. Accordingly, reducing R&D personnel turnover has become a major human resource management challenge facing innovative companies. This study combined importance-performance analysis (IPA) with the decision-making trial and evaluation laboratory (DEMATEL) method to propose an IPA-DEMATEL model. Establishing this model involved three steps. First, an IPA was conducted to measure the importance of and satisfaction gained from job satisfaction criteria. Second, the DEMATEL method was used to determine the causal relationships of and interactive influence among the criteria. Third, a criteria model was constructed to evaluate job satisfaction of high-tech R&D personnel. On the basis of the findings, managerial suggestions are proposed.

  4. Considerations on a Cost Model for High-Field Dipole Arc Magnets for FCC

    CERN Document Server

    AUTHOR|(CDS)2078700; Durante, Maria; Lorin, Clement; Martinez, Teresa; Ruuskanen, Janne; Salmi, Tiina; Sorbi, Massimo; Tommasini, Davide; Toral, Fernando

    2017-01-01

    In the frame of the European Circular Collider (EuroCirCol), a conceptual design study for a post-Large Hadron Collider (LHC) research infrastructure based on an energy-frontier 100 TeV circular hadron collider [1]–[3], a cost model for the high-field dipole arc magnets is being developed. The aim of the cost model in the initial design phase is to provide the basis for sound strategic decisions towards cost effective designs, in particular: (A) the technological choice of superconducting material and its cost, (B) the target performance of Nb3Sn superconductor, (C) the choice of operating temperature (D) the relevant design margins and their importance for cost, (E) the nature and extent of grading, and (F) the aperture’s influence on cost. Within the EuroCirCol study three design options for the high field dipole arc magnets are under study: cos − θ [4], block [5], and common-coil [6]. Here, in the advanced design phase, a cost model helps to (1) identify the cost drivers and feed-back this informati...

  5. Fully kinetic model of breakdown during sheath expansion after interruption of vacuum arcs

    Science.gov (United States)

    Wang, Zhenxing; Wang, Haoran; Zhou, Zhipeng; Tian, Yunbo; Geng, Yingsan; Wang, Jianhua; Liu, Zhiyuan

    2016-08-01

    Research on sheath expansion is critical to the understanding of the dielectric recovery process in a vacuum interrupter after interruption of vacuum arcs. In this paper, we investigated how residual plasma affects breakdown in the sheath expansion period after the current zero. To simulate sheath expansion and breakdown, we developed a fully kinetic particle-in-cell Monte Carlo collision model with one spatial dimension and three velocity dimensions. The model accounted for various collisions, including ionization, excitation, elastic collisions, charge exchange, and momentum exchange, and we added an external circuit to the model to make the calculations self-consistent. The existence of metal vapor slowed the sheath expansion in the gap and caused high electric field formation in front of the cathode surface. The initial residual plasma, which was at sufficiently low density, seemed to have a limited impact on breakdown, and the metal vapor dominated the breakdown in this case. Additionally, the breakdown probability was sensitive to the initial plasma density if the value exceeded a specific threshold, and plasma at sufficiently high density could mean that breakdown would occur more easily. We found that if the simulation does not take the residual plasma into account, it could overestimate the critical value of the metal vapor density, which is always used to describe the boundary of breakdown after interruption of vacuum arcs. We discussed the breakdown mechanism in sheath expansion, and the breakdown is determined by a combination of metal vapor, residual plasma, and the electric field in front of the cathode surface.

  6. Modeling of zinc solubility in stabilized/solidified electric arc furnace dust.

    Science.gov (United States)

    Fernández-Olmo, Ignacio; Lasa, Cristina; Irabien, Angel

    2007-06-18

    Equilibrium models which attempt for the influence of pH on the solubility of metals can improve the dynamic leaching models developed to describe the long-term behavior of waste-derived forms. In addition, such models can be used to predict the concentration of metals in equilibrium leaching tests at a given pH. The aim of this work is to model the equilibrium concentration of Zn from untreated and stabilized/solidified (S/S) electric arc furnace dust (EAFD) using experimental data obtained from a pH-dependence leaching test (acid neutralization capacity, ANC). EAFD is a hazardous waste generated in electric arc furnace steel factories; it contains significant amounts of heavy metals such as Zn, Pb, Cr or Cd. EAFD from a local factory was characterized by X-ray fluorescence (XRF), acid digestion and X-ray diffraction (XRD). Zn and Fe were the main components while the XRD analysis revealed that zincite, zinc ferrite and hematite were the main crystalline phases. Different cement/EAFD formulations ranging from 7 to 20% dry weight of cement were prepared and subjected to the ANC leaching test. An amphoteric behavior of Zn was found from the pH dependence test. To model this behavior, the geochemical model Visual MINTEQ (VMINTEQ) was used. In addition to the geochemical model, an empirical model based on the dissolution of Zn in the acidic zone and the re-dissolution of zinc compounds in the alkaline zone was considered showing a similar prediction than that obtained with VMINTEQ. This empirical model seems to be more appropriate when the metal speciation is unknown, or when if known, the theoretical solid phases included in the database of VMINTEQ do not allow to describe the experimental data.

  7. Impact of Tourist Perceptions, Destination Image and Tourist Satisfaction on Destination Loyalty: A Conceptual Model

    Directory of Open Access Journals (Sweden)

    R Rajesh

    2013-07-01

    Full Text Available The objective this research paper is develops a destination loyalty theoretical model by using tourist perception, destination image and tourist satisfaction. These study analysis components, attributes, factor influencing the destination image and examine the tourist satisfaction and determinants of destination loyalty. This is a conceptual paper attempts at evaluating recent empirical on destination image, tourist satisfaction and loyalty. The conceptual framework model is developed on the basis of existing theoretical and empirical research in the field of destination marketing. The models include four constructs. Tourist Perception constructs has been influenced by factors like Historical and Cultural Attractions, Destination Affordability, Travel Environment, Natural Attractions, Entertainments and Infrastructure. Destination image construct has been influenced by factors like Infrastructure & Facilities, Heritage Attractions, Natural Made Attractions, Destination Safety & Cleanness, Friendly Local Community & Clam Atmosphere, Rejuvenation and Service Price and Affordability. The satisfaction construct has been influenced by factors like Entertainments, Destination Attractions and Atmosphere, Accommodation, Food, Transportation Services and Shopping. The destination loyalty construct has influenced by intentions to revisit, word of mouth promotion and recommending to others . The earlier study result reveals that tourist perception, destination image and tourist satisfaction directly influence destination loyalty. The outcomes of the study have significant managerial implications for destination marketing managers.

  8. The Factors Influencing Satisfaction with Public City Transport: A Structural Equation Modelling Approach

    Directory of Open Access Journals (Sweden)

    Pawlasova Pavlina

    2015-12-01

    Full Text Available Satisfaction is one of the key factors which influences customer loyalty. We assume that the satisfied customer will be willing to use the ssame service provider again. The overall passengers´ satisfaction with public city transport may be affected by the overall service quality. Frequency, punctuality, cleanliness in the vehicle, proximity, speed, fare, accessibility and safety of transport, information and other factors can influence passengers´ satisfaction. The aim of this paper is to quantify factors and identify the most important factors influencing customer satisfaction with public city transport within conditions of the Czech Republic. Two methods of analysis are applied in order to fulfil the aim. The method of factor analysis and the method Varimax were used in order to categorize variables according to their mutual relations. The method of structural equation modelling was used to evaluate the factors and validate the model. Then, the optimal model was found. The logistic parameters, including service continuity and frequency, and service, including information rate, station proximity and vehicle cleanliness, are the factors influencing passengers´ satisfaction on a large scale.

  9. Dry hyperbaric gas metal arc welding of subsea pipelines: experiments and modeling

    Energy Technology Data Exchange (ETDEWEB)

    Azar, Amin S.

    2012-07-01

    welding parameters. The datasets are representing the effects of using pure argon under 14 incrementally increased pressure levels. Fast Fourier Transformation (FFT) is used to characterize the frequency domain of the waveforms. Auto-correlation Function (AF) and Power Spectral Density (PSD) were calculated assuming the Wiener-Khinchin theorem. Considering the AF, it is possible to visualize the deteriorating stability of the arc. The rate of stability degradation is quite gentle after 20 bar, though, huge differences were observed from 1 to 20 bar. The characteristic frequencies of 100-150 Hz and 350-400 Hz were observed. The first range can be associated with the mass transfer or molten droplet launch frequency and the latter range is representative of the rectified mains. The spread of large low-frequency peaks at higher pressures is illustrating the mass transfer deterioration. The aforementioned peaks were found above 125 bar where the range of the characteristic frequency peaks in voltage and current waveforms started to deviate. The calculated arc power is higher at high-pressure range while the weld bead geometry was barely varied. It implies that the arc efficiency factor decreases at high pressures.The heat source dimensions and heat efficiency factor are two major inputs for finite element (FE) simulations of the weld. However, a systematic classification of these factors was hardly available prior to this work. Additionally, to the best of author's knowledge, the direct high-speed observation of the arc inside the hyperbaric welding chamber has not been investigated in detail by far due to several technological issues. The varying bead-on-plate welds including the end crater appearance can possibly be good candidates to categorize the FE heat source dimensions. Double-ellipsoidal heat source (Goldak's Model) was implemented in WeldSimS R FE code that is used in this study. Since the model incorporates two superimposed reference heat sources, the

  10. A Model for Subjective Well-Being in Adolescence: Need Satisfaction and Reasons for Living

    Science.gov (United States)

    Eryilmaz, Ali

    2012-01-01

    Subjective well-being is as important for adolescents as it is in other stages of life. This study thus aims to develop a model for subjective well-being, which is limited to need satisfaction in adolescence and reasons for living, and to test the validity of the model. Participants were a total of 227 individuals, 120 females and 107 males. Data…

  11. A Brand Loyalty Model Utilizing Team Identification and Customer Satisfaction in the Licensed Sports Product Industry

    Science.gov (United States)

    Lee, Soonhwan; Shin, Hongbum; Park, Jung-Jun; Kwon, Oh-Ryun

    2010-01-01

    The purpose of this study was to investigate the relationship among the attitudinal brand loyalty variables (i.e., cognitive, affective, and conative components), team identification, and customer satisfaction by developing a structural equation model, based on Oliver's (1997) attitudinal brand loyalty model. The results of this study confirmed…

  12. Predicting the Job and Life Satisfaction of Italian Teachers: Test of a Social Cognitive Model

    Science.gov (United States)

    Lent, Robert W.; Nota, Laura; Soresi, Salvatore; Ginevra, Maria C.; Duffy, Ryan D.; Brown, Steven D.

    2011-01-01

    This study tested a social cognitive model of work and life satisfaction (Lent & Brown, 2006, 2008) in a sample of 235 Italian school teachers. The model offered good overall fit to the data, though not all individual path coefficients were significant. Three of five predictors (favorable work conditions, efficacy-relevant supports, and…

  13. Standards-Based Evaluation and Teacher Career Satisfaction: A Structural Equation Modeling Analysis

    Science.gov (United States)

    Conley, Sharon; Muncey, Donna E.; You, Sukkyung

    2005-01-01

    Structural equation modeling was used to assess the plausibility of a conceptual model specifying hypothesized linkages among perceptions of characteristics of standards-based evaluation, work environment mediators, and career satisfaction and other outcomes. Four comprehensive high schools located in two neighboring counties in southern…

  14. A Model for Subjective Well-Being in Adolescence: Need Satisfaction and Reasons for Living

    Science.gov (United States)

    Eryilmaz, Ali

    2012-01-01

    Subjective well-being is as important for adolescents as it is in other stages of life. This study thus aims to develop a model for subjective well-being, which is limited to need satisfaction in adolescence and reasons for living, and to test the validity of the model. Participants were a total of 227 individuals, 120 females and 107 males. Data…

  15. Auxiliary particle filter-model predictive control of the vacuum arc remelting process

    Science.gov (United States)

    Lopez, F.; Beaman, J.; Williamson, R.

    2016-07-01

    Solidification control is required for the suppression of segregation defects in vacuum arc remelting of superalloys. In recent years, process controllers for the VAR process have been proposed based on linear models, which are known to be inaccurate in highly-dynamic conditions, e.g. start-up, hot-top and melt rate perturbations. A novel controller is proposed using auxiliary particle filter-model predictive control based on a nonlinear stochastic model. The auxiliary particle filter approximates the probability of the state, which is fed to a model predictive controller that returns an optimal control signal. For simplicity, the estimation and control problems are solved using Sequential Monte Carlo (SMC) methods. The validity of this approach is verified for a 430 mm (17 in) diameter Alloy 718 electrode melted into a 510 mm (20 in) diameter ingot. Simulation shows a more accurate and smoother performance than the one obtained with an earlier version of the controller.

  16. Welding arc plasma physics

    Science.gov (United States)

    Cain, Bruce L.

    1990-01-01

    The problems of weld quality control and weld process dependability continue to be relevant issues in modern metal welding technology. These become especially important for NASA missions which may require the assembly or repair of larger orbiting platforms using automatic welding techniques. To extend present welding technologies for such applications, NASA/MSFC's Materials and Processes Lab is developing physical models of the arc welding process with the goal of providing both a basis for improved design of weld control systems, and a better understanding of how arc welding variables influence final weld properties. The physics of the plasma arc discharge is reasonably well established in terms of transport processes occurring in the arc column itself, although recourse to sophisticated numerical treatments is normally required to obtain quantitative results. Unfortunately the rigor of these numerical computations often obscures the physics of the underlying model due to its inherent complexity. In contrast, this work has focused on a relatively simple physical model of the arc discharge to describe the gross features observed in welding arcs. Emphasis was placed of deriving analytic expressions for the voltage along the arc axis as a function of known or measurable arc parameters. The model retains the essential physics for a straight polarity, diffusion dominated free burning arc in argon, with major simplifications of collisionless sheaths and simple energy balances at the electrodes.

  17. Account of near-cathode sheath in numerical models of high-pressure arc discharges

    Science.gov (United States)

    Benilov, M. S.; Almeida, N. A.; Baeva, M.; Cunha, M. D.; Benilova, L. G.; Uhrlandt, D.

    2016-06-01

    Three approaches to describing the separation of charges in near-cathode regions of high-pressure arc discharges are compared. The first approach employs a single set of equations, including the Poisson equation, in the whole interelectrode gap. The second approach employs a fully non-equilibrium description of the quasi-neutral bulk plasma, complemented with a newly developed description of the space-charge sheaths. The third, and the simplest, approach exploits the fact that significant power is deposited by the arc power supply into the near-cathode plasma layer, which allows one to simulate the plasma-cathode interaction to the first approximation independently of processes in the bulk plasma. It is found that results given by the different models are generally in good agreement, and in some cases the agreement is even surprisingly good. It follows that the predicted integral characteristics of the plasma-cathode interaction are not strongly affected by details of the model provided that the basic physics is right.

  18. Managerial Coaching Model and the Impact of its Activities on Employee Satisfaction and Company Performance

    Directory of Open Access Journals (Sweden)

    Petra Cajnko

    2014-12-01

    Full Text Available The article tries to answer the research question: What is the potential additive effect on employee satisfaction and overall company performance when using managerial coaching model and its activities? The purpose of the article has been to form a model of managerial coaching and of the influence of its activities on employee satisfaction and overall company performance based on theory review and field study results. We have confirmed the two main hypotheses and all the secondary hypotheses with two empirical studies, one focused on the managers and the other on the employees. The topic is of practical value and it will help managers in Slovenia and abroad to understand the effect of the activities of coaching on employee satisfaction and overall company performance.

  19. Analysis on influencing factors of clinical teachers’ job satisfaction by structural equation model

    Directory of Open Access Journals (Sweden)

    Haiyi Jia

    2017-02-01

    Full Text Available [Research objective] Analyze the influencing factors of clinical teachers’ job satisfaction. [Research method] The ERG theory was used as the framework to design the questionnaires. Data were analyzed by structural equation model for investigating the influencing factors. [Research result] The modified model shows that factors of existence needs and growth needs have direct influence on the job satisfaction of clinical teachers, the influence coefficients are 0.540 and 0.380. The three influencing factors have positive effects on each other, and the correlation coefficients are 0.620, 0.400 and 0.330 respectively. [Research conclusion] Relevant departments should take active measures to improve job satisfaction of clinical teachers from two aspects: existence needs and growth needs, and to improve their work enthusiasm and teaching quality.

  20. An Approach for Customer Satisfaction: Evaluation, Validation and Modeling By A Markov Chain

    Directory of Open Access Journals (Sweden)

    Amina EL KEBBAJ

    2015-01-01

    Full Text Available The main objective of this work is to develop a practical approach to improve customer satisfaction, which is generally regarded as the pillar of customer loyalty to the company. Today, customer satisfaction is a major challenge. In fact, listening to the customer, anticipating and properly managing his claims are stone keys and fundamental values for the company. From a perspective of the quality of the product, skills, and mostly, the service provided to the customer, it is essential for organizations to differentiate themselves, especially in a more competitive world, in order to ensure a higher level of customer satisfaction. Ignoring or not taking into account customer satisfaction can have harmful consequences on both the economic performances and the organization’s image. For that, it is crucial to develop new methods and have new approaches to the problematic customer dissatisfaction, by improving the services quality provided to the costumer. This work describes a simple and practical approach for modeling customer satisfaction for organizations in order to reduce the level of dissatisfaction using the decisional prediction that allows companies to anticipate and adapt to future changes in their environment to be able to make the best decisions to ensure their sustainability. This approach respects the constraints of the organization and eliminates any action that can lead to loss of customers and degradation of the image of the organization. The problem is mathematically modeled by a Markov chain and practical examples to illustrate the work are given.

  1. A structural model of customer satisfaction and trust in vendors involved in mobile commerce

    Directory of Open Access Journals (Sweden)

    Suki, N.M.

    2011-01-01

    Full Text Available The purpose of this paper is to provide an explanation of factors influencing customer satisfaction and trust in vendors involved in mobile commerce (m-commerce. The study sample consists of 200 respondents. Data were analyzed by employing structural equation modelling (SEM supported by AMOS 5.0 with maximum likelihood estimation in order to test the proposed hypotheses. The proposed model was empirically tested and results confirmed that users’ satisfaction with vendors in m-commerce was not significantly influenced by two antecedents of the vendor’s website quality: interactivity and customisation, and also two antecedents of mobile technology quality: usefulness and ease-of-use. Meanwhile, users’ trust towards the vendor in m-commerce is affected by users’ satisfaction with the vendor. Interestingly, vendor quality dimensions such as responsiveness and brand image influence customer satisfaction with vendors in m-commerce. Based on the findings, vendors in m-commerce should focus on the factors which generate more satisfaction and trust among customers. For vendors in general, the results can help them to better develop customer trust in m-commerce. Vendors of m-commerce can provide a more satisfying experience for customers.

  2. Modeling the role of back-arc spreading in controlling 3-D circulation and temperature patterns in subduction zones

    Science.gov (United States)

    Kincaid, C.

    2005-12-01

    Subduction of oceanic lithosphere provides a dominant driving force for mantle dynamics and plate tectonics, and strongly modulates the thermal evolution of the mantle. Magma generation in arc environments is related to slab temperatures, slab dehydration/wedge hydration processes and circulation patterns in the mantle wedge. A series of laboratory experiments is used to model three-dimensional aspects of flow in subduction zones, and the consequent temperature variations in the slab and overlying mantle wedge. The experiments utilize a tank of glucose syrup to simulate the mantle and a Phenolic plate to represent subducting oceanic lithosphere. Different modes of plate sinking are produced using hydraulic pistons. The effects of longitudinal, rollback and slab-steepening components of slab motions are considered, along with different thicknesses of the over-riding lithosphere. Models look specifically at how distinct modes of back-arc spreading alter subduction zone temperatures and flow in the mantle wedge. Results show remarkably different temperature and circulation patterns when spreading is produced by rollback of the trench-slab-arc relative to a stationary overriding back-arc plate versus spreading due to motion of the overriding plate away from a fixed trench location. For rollback-induced spreading, flow trajectories in the wedge are shallow (e.g., limited upwelling), both the sub-arc and back-arc regions are supplied by material flowing around the receding slab. Flow lines in the sub-arc wedge are strongly trench-parallel. In these cases, strong lateral variations in slab surface temperature (SST) are recorded (hot at plate center, cool at plate edge). When the trench is fixed in space and spreading is produced by motion of the overriding plate, strong vertical flow velocities are recorded in the wedge, both the shallow sub-arc and back-arc regions are supplied by flow from under the overriding plate producing strong vertical shear. In these cases SSTs

  3. The optimization of welding regime parameters at shielded metal arc welding (SMAW by mathematical modeling

    Directory of Open Access Journals (Sweden)

    V. Petrescu

    2016-04-01

    Full Text Available The realized researches followed the determining of mathematical models that allow the optimization of the welding process in order to obtain welded joints with certain values of the mechanical characteristics. Thus, there were established mathematical models of dependence of mechanical characteristics of welded joints (Rm, Rp02, Z, A, KCV 20°C of each parameter of welding regime (Iw, Uw, and also, mathematical models that offer cumulative dependence of mechanical characteristics of both parameters of welding regime.The researches have been carried out using steel E 36-4 as base material and as filler material basic electrodes, type E7018 and the applied welding procedure was the process: shielded metal arc welding (SMAW.

  4. Health care competition, strategic mission, and patient satisfaction: research model and propositions.

    Science.gov (United States)

    Rivers, Patrick A; Glover, Saundra H

    2008-01-01

    In all industries, competition among businesses has long been encouraged as a mechanism to increase value for patients. In other words, competition ensures the provision of better products and services to satisfy the needs of customers This paper aims to develop a model that can be used to empirically investigate a number of complex issues and relationships associated with competition in the health care industry. A literature review was conducted. A total of 50 items of literature related to the subject were reviewed. Various perspectives of competition, the nature of service quality, health system costs, and patient satisfaction in health care are examined. A model of the relationship among these variables is developed. The model depicts patient satisfaction as an outcome measure directly dependent on competition. Quality of care and health care systems costs, while also directly dependent on the strategic mission and goals, are considered as determinants of customer satisfaction as well. The model is discussed in the light of propositions for empirical research. Empirical studies based on the model proposed in this paper should help identify areas with significant impact on patient satisfaction while maintaining high quality of service at lower costs in a competitive environment. The authors develop a research model which included propositions to examine the complex issues of competition in the health care industry.

  5. Investigation of Voltage Unbalance Problems In Electric Arc Furnace Operation Model

    Directory of Open Access Journals (Sweden)

    Yacine DJEGHADER

    2013-06-01

    Full Text Available In modern steel industry, Electric Arc Furnaces are widely used for iron and scarp melting. The operation of electric arc furnace causes many power quality problems such as harmonics, unbalanced voltage and flicker. The factors that affect Electric arc furnace operation are the melting or refining materials, melting stage, electrodes position (arc length, electrode arm control and short circuit power of the feeder, so, arc voltages, current and power are defined as a nonlinear function of arc length. This study focuses on investigation of unbalanced voltage due to Electrics Arc Furnace operation mode. The simulation results show the major problem of unbalanced voltage affecting secondary of furnace transformer is caused by the different continues movement of electrodes.

  6. Comparative study analysing women's childbirth satisfaction and obstetric outcomes across two different models of maternity care

    OpenAIRE

    Conesa Ferrer, Ma Belén; Canteras Jordana, Manuel; Ballesteros Meseguer, Carmen; Carrillo García, César; Martínez Roche, M Emilia

    2016-01-01

    Objectives To describe the differences in obstetrical results and women's childbirth satisfaction across 2 different models of maternity care (biomedical model and humanised birth). Setting 2 university hospitals in south-eastern Spain from April to October 2013. Design A correlational descriptive study. Participants A convenience sample of 406 women participated in the study, 204 of the biomedical model and 202 of the humanised model. Results The differences in obstetrical results were (biom...

  7. Wage Equity and Female Faculty Job-Satisfaction: The Role of Wage Differentials in a Job Satisfaction Causal Model. ASHE Annual Meeting Paper.

    Science.gov (United States)

    Hagedorn, Linda Serra

    This study examined the role of female/male wage differentials in a model of job satisfaction. It is based on data from 5,021 respondents to the 1989 Carnegie Foundation for the Advancement of Teaching national faculty survey. The model considers the interrelated effects of the calculated wage differential, stress, social perceptions of students,…

  8. The Effects of Educative Software, Based on the Arcs Motivation Model on Student's Academic Success and Permanence in Education

    Directory of Open Access Journals (Sweden)

    Ümmü ÇETİN

    2008-12-01

    Full Text Available In this study, education based on ARCS Motivation Model design principles and traditional education were compared in terms of student success and the continuance of learning. To this end, an educative software suitable to the design principles of ARCS Motivation Model for Microsoft Excels' "statistical functions" theme was prepared.With a pretest of the experimental and control group, the equivalence of the groups were determined. In the control group the laboratory study was performed with the traditional method and in the experimental group ,education was given with the prepared educative software. At the end of the education, a final exam to both groups and a continuance exam after completion of the education program were performed. The findings after the analysis reflect, that the performed education, based on the according to ARCS Motivation Model designed software, compared to the laboratory study with traditional methods, relatively increases the grade of academic success much significantly.

  9. Information support model and its impact on utility, satisfaction and loyalty of users

    Directory of Open Access Journals (Sweden)

    Sead Šadić

    2016-11-01

    Full Text Available In today’s modern age, information systems are of vital importance for successful performance of any organization. The most important role of any information system is its information support. This paper develops an information support model and presents the results of the survey examining the effects of such model. The survey was performed among the employees of Brčko District Government and comprised three phases. The first phase assesses the influence of the quality of information support and information on information support when making decisions. The second phase examines the impact of information support when making decisions on the perceived availability and user satisfaction with information support. The third phase examines the effects of perceived usefulness as well as information support satisfaction on user loyalty. The model is presented using six hypotheses, which were tested by means of a multivariate regression analysis. The demonstrated model shows that the quality of information support and information is of vital importance in the decision-making process. The perceived usefulness and customer satisfaction are of vital importance for continuous usage of information support. The model is universal, and if slightly modified, it can be used in any sphere of life where satisfaction is measured for clients and users of some service.

  10. The use of social networking services and their relationship with the big five personality model and job satisfaction in Korea.

    Science.gov (United States)

    Kim, Hyondong; Chung, Yang Woon

    2014-10-01

    Social networking services (SNSs) have been garnering attention from society due to their recent rapid growth. This study examines whether SNS use can affect the relationship between the Big Five personality model and individual job satisfaction. Based on a sample of 1,452 workers in Korea, the results of this study indicate that the Big Five personality model (extroversion, agreeableness, and neuroticism) was significantly related to individual job satisfaction. Further, SNS use moderated the relationship between extroversion and neuroticism with individual job satisfaction. Also, SNS use was found to increase job satisfaction of Korean workers who are more extroverted, while it also affected job satisfaction of Korean workers with low agreeableness. As SNS use plays an important role in the workplace, it is necessary to realize and appreciate the importance of SNSs in shaping and promoting job satisfaction of working individuals.

  11. PHYSICAL MODELLING OF TERRAIN DIRECTLY FROM SURFER GRID AND ARC/INFO ASCII DATA FORMATS#

    Directory of Open Access Journals (Sweden)

    Y.K. Modi

    2012-01-01

    Full Text Available

    ENGLISH ABSTRACT: Additive manufacturing technology is used to make physical models of terrain using GIS surface data. Attempts have been made to understand several other GIS file formats, such as the Surfer grid and the ARC/INFO ASCII grid. The surface of the terrain in these file formats has been converted into an STL file format that is suitable for additive manufacturing. The STL surface is converted into a 3D model by making the walls and the base. In this paper, the terrain modelling work has been extended to several other widely-used GIS file formats. Terrain models can be created in less time and at less cost, and intricate geometries of terrain can be created with ease and great accuracy.

    AFRIKAANSE OPSOMMING: Laagvervaardigingstegnologie word gebruik om fisiese modelle van terreine vanaf GIS oppervlakdata te maak. Daar is gepoog om verskeie ander GIS lêerformate, soos die Surfer rooster en die ARC/INFO ASCII rooster, te verstaan. Die oppervlak van die terrein in hierdie lêerformate is omgeskakel in 'n STL lêerformaat wat geskik is vir laagvervaardiging. Verder is die STL oppervlak omgeskakel in 'n 3D model deur die kante en die basis te modelleer. In hierdie artikel is die terreinmodelleringswerk uitgebrei na verskeie ander algemeen gebruikte GIS lêerformate. Terreinmodelle kan so geskep word in korter tyd en teen laer koste, terwyl komplekse geometrieë van terreine met gemak en groot akkuraatheid geskep kan word.

  12. Examining the link between patient satisfaction and adherence to HIV care: a structural equation model.

    Science.gov (United States)

    Dang, Bich N; Westbrook, Robert A; Black, William C; Rodriguez-Barradas, Maria C; Giordano, Thomas P

    2013-01-01

    Analogous to the business model of customer satisfaction and retention, patient satisfaction could serve as an innovative, patient-centered focus for increasing retention in HIV care and adherence to HAART, and ultimately HIV suppression. To test, through structural equation modeling (SEM), a model of HIV suppression in which patient satisfaction influences HIV suppression indirectly through retention in HIV care and adherence to HAART. We conducted a cross-sectional study of adults receiving HIV care at two clinics in Texas. Patient satisfaction was based on two validated items, one adapted from the Consumer Assessment of Healthcare Providers and Systems survey ("Would you recommend this clinic to other patients with HIV?) and one adapted from the Delighted-Terrible Scale, ("Overall, how do you feel about the care you got at this clinic in the last 12 months?"). A validated, single-item question measured adherence to HAART over the past 4 weeks. Retention in HIV care was based on visit constancy in the year prior to the survey. HIV suppression was defined as plasma HIV RNA survey. We used SEM to test hypothesized relationships. The analyses included 489 patients (94% of eligible patients). The patient satisfaction score had a mean of 8.5 (median 9.2) on a 0- to 10- point scale. A total of 46% reported "excellent" adherence, 76% had adequate retention, and 70% had HIV suppression. In SEM analyses, patient satisfaction with care influences retention in HIV care and adherence to HAART, which in turn serve as key determinants of HIV suppression (all psatisfaction may have direct effects on retention in HIV care and adherence to HAART. Interventions to improve the care experience, without necessarily targeting objective clinical performance measures, could serve as an innovative method for optimizing HIV outcomes.

  13. 基于SketchUp和ArcGIS三维虚拟校园模型的设计与实现%Design and Realization of 3D Virtual Campus Model Based on Sketch Up and ArcGIS

    Institute of Scientific and Technical Information of China (English)

    周鹏

    2016-01-01

    以校区为例,基于SketchUp和ArcGIS软件的主要理论和建模方法,探讨了三维校园模型的构建,表面纹理贴图,了解了SketchUp和ArcGIS结合建模的具体流程,实现了校区的三维动画漫游。%Based on the theory and modeling method of Sketch Up and ArcGIS, this paper discusses the building and sur-face texture mapping of 3D campus model, gets the detailed process of modeling with Sketch Up and ArcGIS, and realizes the 3D animation of campus.

  14. Numerical Modeling of Enhanced Nitrogen Dissolution During Gas Tungsten Arc Welding

    Energy Technology Data Exchange (ETDEWEB)

    Palmer, T A

    2001-08-17

    bubbles are filled with nitrogen gas, which has been rejected from the liquid iron. Outside the arc column, the nitrogen in solution in the iron is in equilibrium with diatomic nitrogen rather than monatomic nitrogen, which dominates the arc column. Models based on the role of the plasma phase in producing these enhanced nitrogen concentrations have also been developed. For example, Gedeon and Eaga have proposed that the diatomic gas introduced into the plasma phase in the arc column partially dissociates at a temperature higher than that at the sample surface. The monatomic species is then transported to the liquid metal surface, where it is absorbed at the temperature on the liquid metal surface. Mundra and DebRoy have used this same methodology to develop a semi-quantitative model to describe the temperature at which the diatomic gas dissociates in the plasma phase. In the two-temperature model, a hypothetical temperature, T{sub d}, equal to the temperature at which the equilibrium thermal dissociation of diatomic nitrogen produces the partial pressure of monatomic nitrogen in the plasma, is defined. This dissociation temperature is in a range of 100 to 300 K higher than the temperature at the metal surface, T{sub s}, and is a measure of the partial pressure of the atomic nitrogen in the plasma. This methodology provides an order-of-magnitude agreement between the calculated and experimental nitrogen concentrations but does not strictly provide a capability for predicting the nitrogen concentration. No quantitative means for predicting the nitrogen concentration in the weld metal currently exists. In developing a quantitative model, it must be recognized that nitrogen dissolution into the weld pool is intimately tied to several simultaneously occurring physical processes. These processes include the formation of various nitrogen species in the plasma phase above the weld pool, reactions at the interface between the plasma phase and the weld pool surface, and the

  15. Pluton emplacement and magmatic arc construction: A model from the Patagonian batholith

    Science.gov (United States)

    Bruce, Robert; Nelson, Eric; Weaver, Stephen

    1988-01-01

    A model of batholithic construction in Andean arcs and its applicability to possibly similar environments in the past is described. Age and compositional data from the Patagonian batholith of southern Chile show a long history of magmatism in any given area (total age range is 15 to 157 Ma), but different regions appear to have different magmatic starting ages. Furthermore, mafic rocks seem to be the oldest components of any given region. An assembly line model involving semicontinuous magmatism and uplift was outlined, which has implications for other terranes: uplift rates will be proportional to observed ranges in age, and total uplift will be proportional to the age of the oldest pluton in any given area. It is suggested that misleading results would be obtained if only small areas of similar terranes in the Archean were available for study.

  16. Analysis of factors affecting satisfaction level on problem based learning approach using structural equation modeling

    Science.gov (United States)

    Hussain, Nur Farahin Mee; Zahid, Zalina

    2014-12-01

    Nowadays, in the job market demand, graduates are expected not only to have higher performance in academic but they must also be excellent in soft skill. Problem-Based Learning (PBL) has a number of distinct advantages as a learning method as it can deliver graduates that will be highly prized by industry. This study attempts to determine the satisfaction level of engineering students on the PBL Approach and to evaluate their determinant factors. The Structural Equation Modeling (SEM) was used to investigate how the factors of Good Teaching Scale, Clear Goals, Student Assessment and Levels of Workload affected the student satisfaction towards PBL approach.

  17. Exploring a Contextual Model of Sexual Self-Disclosure and Sexual Satisfaction.

    Science.gov (United States)

    Brown, Randal D; Weigel, Daniel J

    2017-03-13

    Sexual self-disclosure is a critical component of relationship and sexual satisfaction, yet little is known about the mechanisms that facilitate a person's engagement in sexual self-disclosure. Individuals (N = 265) involved in romantic relationships participated in an online study testing a contextual model of sexual self-disclosure across three contexts: relationship context, sexual self-disclosure context, and outcome of sexual self-disclosure. Results suggest that sexual satisfaction was predicted by a positive relationship context and a positive sexual self-disclosure context. In addition, the sexual self-disclosure context was predicted by the relationship context. These findings emphasize the importance of examining contextual influences that determine whether an individual will engage in or avoid sexual self-disclosure and the consequences of this engagement or avoidance on sexual satisfaction.

  18. KNOWLEDGE MANAGEMENT DRIVEN BUSINESS PROCESS AND WORKFLOW MODELING WITHIN AN ORGANIZATION FOR CUSTOMER SATISFACTION

    Directory of Open Access Journals (Sweden)

    Atsa Etoundi roger,

    2010-12-01

    Full Text Available Enterprises to deal with the competitive pressure of the network economy have to design their business processes and workflow systems based on the satisfaction of customers. Therefore, mass product productions have to be abandoned for individual and customized products. Enterprises that fail to meet this challenge will beobliged to step down. Those which tackle this problem need to manage the knowledge of various customers in order to come out with a set of criteria for the delivery of services or production of products. These criteria should then be use to reengineer the business processes and workflows accordingly for the satisfaction of eachof the customers. In this paper, based on the knowledge management approach, we define an enterprise business process and workflow model for the delivery of services and production of goods based on the satisfaction of customers.

  19. Satisfaction Ratings of QOLPAV: Psychometric Properties Based on the Graded Response Model

    Science.gov (United States)

    Chen, Ssu-Kuang; Hwang, Fang-Ming; Lin, Sunny S. J.

    2013-01-01

    A scale measuring quality of life (QOL) is important in adolescent research. Using the graded response model (GRM), this study evaluates the psychometric properties of the satisfaction ratings of the Quality of Life Profile Adolescent Version (QOLPAV). Data for 1,392 adolescents were used to check IRT assumptions such as unidimensionality and…

  20. Assessing Satisfaction with Selected Student Services Using SERVQUAL, a Market-Driven Model of Service Quality.

    Science.gov (United States)

    Ruby, Carl A.

    1998-01-01

    Demonstrates how the use of SERVQUAL, a market-driven assessment model adapted from business, can be used to study student satisfaction with four areas of support services hypothetically related to enrollment management. The sample included 748 students enrolled in general education courses at ten different private institutions. (Contains 27…

  1. Longitudinal Test of a Social Cognitive Model of Academic and Life Satisfaction

    Science.gov (United States)

    Singley, Daniel B.; Lent, Robert W.; Sheu, Hung-Bin

    2010-01-01

    The authors tested a social cognitive model of academic and overall life satisfaction in a sample of 769 university students. The predictors, drawn from Lent's unifying perspective on well-being and psychosocial adjustment, included social cognitive (academic self-efficacy, goal progress, social support) and personality (trait positive affect)…

  2. Applying the Achievement Orientation Model to the Job Satisfaction of Teachers of the Gifted

    Science.gov (United States)

    Siegle, Del; McCoach, D. Betsy; Shea, Kelly

    2014-01-01

    Factors associated with motivation and satisfaction aid in understanding the processes that enhance achievement and productivity. Siegle and McCoach (2005) proposed a motivational model for understanding student achievement and underachievement that included self-perceptions in three areas (meaningfulness [goal valuation], self-efficacy, and…

  3. Patient satisfaction with the laborist model of care in a large urban hospital

    Directory of Open Access Journals (Sweden)

    Srinivas SK

    2013-03-01

    Full Text Available Sindhu K Srinivas,1 Anna O Jesus,1 Elene Turzo,1 Dominic A Marchiano,2 Harish M Sehdev,2 Jack Ludmir2 1Maternal and Child Health Research Program, Department of Obstetrics and Gynecology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; 2Pennsylvania Hospital, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA Background: The obstetric practice environment is evolving to include more laborists staffing obstetric units, with the hope of improving quality of care and provider satisfaction, yet there are scant data on the impact of a laborist care model on patient satisfaction or delivery outcomes. We sought to assess patient satisfaction after implementation of the laborist model of obstetric care in a large urban teaching hospital. Methods: Postpartum patients were asked to complete an anonymous survey assessing their satisfaction with care, particularly with regard to the laborist model. Survey questions included rating the overall experience of labor and delivery. All responses were based on a five-point Likert scale. Press-Ganey results were compared from before and after initiation of the model. Descriptive statistics were used to analyze the results. Results: Post-laborist implementation obstetric and delivery experience surveys were collected from 4166 patients, representing a 54% response rate. Ninety percent of patients reported that they were highly satisfied with the overall experience in the labor and delivery unit. A subgroup was asked to rate their experience with the practitioner for their current delivery. Of the 687 respondents, 75% answered excellent, 18% answered good/very good, and 3.4% answered neutral. Eighty-five percent of this subgroup stated that they were informed during prenatal care that they may be delivered by someone other than the practitioner or group that they saw during the pregnancy. Thirty-seven percent (n = 1553 of the total respondents reported that

  4. Application of welding science to welding engineering: A lumped parameter gas metal arc welding dynamic process model

    Energy Technology Data Exchange (ETDEWEB)

    Murray, P.E.; Smartt, H.B.; Johnson, J.A. [Lockheed Martin Idaho Technologies, Idaho Falls, ID (United States)

    1997-12-31

    We develop a model of the depth of penetration of the weld pool in gas metal arc welding (GMAW) which demonstrates interaction between the arc, filler wire and weld pool. This model is motivated by the observations of Essers and Walter which suggest a relationship between droplet momentum and penetration depth. A model of gas metal arc welding was augmented to include an improved model of mass transfer and a simple model of accelerating droplets in a plasma jet to obtain the mass and momentum of impinging droplets. The force of the droplets and depth of penetration is correlated by a dimensionless linear relation used to predict weld pool depth for a range of values of arc power and contact tip to workpiece distance. Model accuracy is examined by comparing theoretical predictions and experimental measurements of the pool depth obtained from bead on plate welds of carbon steel in an argon rich shielding gas. Moreover, theoretical predictions of pool depth are compared to the results obtained from the heat conduction model due to Christensen et al. which suggest that in some cases the momentum of impinging droplets is a better indicator of the depth of the weld pool and the presence of a deep, narrow penetration.

  5. Experimental study and modeling of the deuterium releasing quantity in a pulsed vacuum arc discharge with a metal deuteride cathode

    Science.gov (United States)

    Liu, Fei-Xiang; Long, Ji-Dong; Zheng, Le; Dong, Pan; Li, Chen; Chen, Wei

    2017-04-01

    The pulsed vacuum arc discharge using a metal deuteride cathode is widely applied as a deuterium ion source, where the upper limit of the deuterium ion yield is largely determined by the deuterium releasing quantity (DRQ) from the cathode. This work aims to measure the DRQ at various discharge conditions, and meanwhile develop a simple thermoelectric model to evaluate the deuterium liberation from different sources, such as the crater vicinity during the arc power-on phase and the hot crater in the afterglow. The calculated DRQ are in accordance with the experimental results obtained by measuring the D2 pressure evolution in the early afterglow using a quadrupole mass spectrometer. Furthermore, the model reveals that at low arc current (<10 A), the DRQ orginates dominantly from the crater vicinity, leading to a low conversion efficiency of the released deuterium to ions and a high D:Ti elemental ratio in the released cathode vapor.

  6. Petrological and two-phase flow modelling of deep arc crust: insights on continental crust formation

    Science.gov (United States)

    Riel, Nicolas; Bouilhol, Pierre; van Hunen, Jeroen; Cornet, Julien

    2017-04-01

    The genesis of felsic crust is generally attributed to two main processes: the differentiation of primary magmas by crystallization within the crust or uppermost mantle and the partial melting of older crustal rocks. The Mixing/Assimilation/Hybridization of these magmas in the deep crust (MASH zone) and their subsequent segregation constitutes the principal process by which continents have become differentiated into a more mafic, residual lower crust and a more felsic and hydrated upper crust. Although this model describes qualitatively how continental crust forms, little is known on the physical and chemical mechanisms occurring at the root of volcanic arcs. To assess the dynamics of partial melting, melt injection and hybridization in the deep crust, a new 2-D two-phase flow code using finite volume method has been developed. The formulation takes into account: (i) melt flow through porosity waves/channels, (ii) heat transfer, assuming local thermal equilibrium between solid and liquid, (iii) thermodynamic modelling of stable phases and (iv) injection of mantle-derived melt at the Moho. Our parametric study shows that pressure, heat influx and melt:rock ratio are the main parameters controlling the volume and composition of differentiated magma. Overall the composition of segregated products scatters in two groups: felsic (80-68% SiO2) and intermediate (60-52% SiO2), with an average andesitic composition. The bimodal distribution is controlled by amphibole which buffer the composition of segregated products to high SiO2-content when stable. As the amphibole-out melting reaction is crossed segregated products become intermediate. When compared to available geological evidence, the liquid line of descent of mantle-derived magma do not fit the Mg# versus silica trends of exposed volcanic arcs. Instead our modelling results show that reactive flow of those same magma through a mafic crust is able to reproduce such trends.

  7. A Hybrid Multiattribute Decision Making Model for Evaluating Students’ Satisfaction towards Hostels

    Directory of Open Access Journals (Sweden)

    Anath Rau Krishnan

    2015-01-01

    Full Text Available This paper proposes a new hybrid multiattribute decision making (MADM model which deals with the interactions that usually exist between hostel attributes in the process of measuring the students’ satisfaction towards a set of hostels and identifying the optimal strategies for enhancing their satisfaction. The model uses systematic random stratified sampling approach for data collection purpose as students dwelling in hostels are “naturally” clustered by block and gender, factor analysis for extracting large set of hostel attributes into fewer independent factors, λ-measure for characterizing the interactions shared by the attributes within each factor, Choquet integral for aggregating the interactive performance scores within each factor, Mikhailov’s fuzzy analytical hierarchy process (MFAHP for determining the weights of independent factors, and simple weighted average (SWA operator to measure the overall satisfaction score of each hostel. A real evaluation involving fourteen Universiti Utara Malaysia (UUM hostels was carried out in order to demonstrate the model’s feasibility. The same evaluation was performed using an additive aggregation model in order to illustrate the effects of ignoring the interactions shared by attributes in hostel satisfaction analysis.

  8. Evaluation Of International Tourist Satisfaction In Weh Island Indonesia Using HOLSAT Model

    Directory of Open Access Journals (Sweden)

    Dr. Syafruddin Chan

    2015-08-01

    Full Text Available The purpose of this research is to examine international tourist satisfaction in marine tourism especially diving and snorkeling in Weh Island Indonesia using Holsat Model. The data for this study come from survey in the field by using questioners and interview not only to tourists but also to other stakeholder such hotel owner government officials international NGO officers and other related parties. 200 Respondents were drawn from four 4 locations most tourists concentrated in Iboih Sumur Tiga Kota and Gapang by using stratified random sampling. The data was tabulated and processed by using Holsat Model that was developed by Tribe and Snaith 1998 as a research instrument for measuring holiday satisfaction. The international travelers were not really satisfied when visited Weh Island. This was because most of the attributes used to measure their satisfaction were still below their expectation. Thus this finding is important for service providers like restaurants travel agents hotels and tourist information centers in Weh Island to improve all the poor indicators rated by tourists. Furthermore the findings demonstrate the usefulness of the HOLSAT model in three aspects First this study identifies tourists sense of satisfaction or dissatisfaction in terms of the various attributes of Weh Island as a holiday destination. Second this study provides insights on how Weh Island is perceived as a holiday destination by international tourists. Third this study provide a better approach to understanding of tourist behavior while they are visiting Weh Island Based on the results of the comparison between expectations and experiences.

  9. A modified dynamic evolving neural-fuzzy approach to modeling customer satisfaction for affective design.

    Science.gov (United States)

    Kwong, C K; Fung, K Y; Jiang, Huimin; Chan, K Y; Siu, Kin Wai Michael

    2013-01-01

    Affective design is an important aspect of product development to achieve a competitive edge in the marketplace. A neural-fuzzy network approach has been attempted recently to model customer satisfaction for affective design and it has been proved to be an effective one to deal with the fuzziness and non-linearity of the modeling as well as generate explicit customer satisfaction models. However, such an approach to modeling customer satisfaction has two limitations. First, it is not suitable for the modeling problems which involve a large number of inputs. Second, it cannot adapt to new data sets, given that its structure is fixed once it has been developed. In this paper, a modified dynamic evolving neural-fuzzy approach is proposed to address the above mentioned limitations. A case study on the affective design of mobile phones was conducted to illustrate the effectiveness of the proposed methodology. Validation tests were conducted and the test results indicated that: (1) the conventional Adaptive Neuro-Fuzzy Inference System (ANFIS) failed to run due to a large number of inputs; (2) the proposed dynamic neural-fuzzy model outperforms the subtractive clustering-based ANFIS model and fuzzy c-means clustering-based ANFIS model in terms of their modeling accuracy and computational effort.

  10. An integrated user-friendly ArcMAP tool for bivariate statistical modeling in geoscience applications

    Science.gov (United States)

    Jebur, M. N.; Pradhan, B.; Shafri, H. Z. M.; Yusof, Z.; Tehrany, M. S.

    2014-10-01

    Modeling and classification difficulties are fundamental issues in natural hazard assessment. A geographic information system (GIS) is a domain that requires users to use various tools to perform different types of spatial modeling. Bivariate statistical analysis (BSA) assists in hazard modeling. To perform this analysis, several calculations are required and the user has to transfer data from one format to another. Most researchers perform these calculations manually by using Microsoft Excel or other programs. This process is time consuming and carries a degree of uncertainty. The lack of proper tools to implement BSA in a GIS environment prompted this study. In this paper, a user-friendly tool, BSM (bivariate statistical modeler), for BSA technique is proposed. Three popular BSA techniques such as frequency ratio, weights-of-evidence, and evidential belief function models are applied in the newly proposed ArcMAP tool. This tool is programmed in Python and is created by a simple graphical user interface, which facilitates the improvement of model performance. The proposed tool implements BSA automatically, thus allowing numerous variables to be examined. To validate the capability and accuracy of this program, a pilot test area in Malaysia is selected and all three models are tested by using the proposed program. Area under curve is used to measure the success rate and prediction rate. Results demonstrate that the proposed program executes BSA with reasonable accuracy. The proposed BSA tool can be used in numerous applications, such as natural hazard, mineral potential, hydrological, and other engineering and environmental applications.

  11. Implementation Weather-Type Models of Capacitated Arc Routing Problem via Heuristics

    Directory of Open Access Journals (Sweden)

    Zuhaimy Ismail

    2011-01-01

    Full Text Available Problem statement: In this study, we introduced a new and real-life condition of Capacitated Arc Routing Problem (CARP, a model that represents vehicles operation in waste collection. In general, we studied the element of rain drops that affected the collected waste weight in total by imposed a new variable namely rainy weight age. In rainy days, the household refusals did not increase in volumes, but in weights due to rain drops. Consequently, this matter thus burdened vehicles capacity and prolonged its operation time. This dynamic variable thus changes the initial CARP model where the existing model did not consider other external elements that have effected onto the model. Approach: Then we developed and enhanced CARP by integrating stochastic demand and time windows to suit the models with our specific case. Results: Objectively, CARP with stochastic demand (CARPSD and CARP with time windows (CARPTW were designed to minimize the total routing cost and number of trips for a vehicle. Our approach is to design CARP models in almost likely to road layout in residential area and graphically this model is called mesh network. We also developed a constructive heuristic that is called nearest procedure based on highest demand/cost (NPHDC and work in conjunction with switching rules to search the feasible solution. Conclusion: Our preliminary results show a higher cost and more trips are needed when the vehicle operates in rainy day compared to normal day operation.

  12. Complex structure of the lithospheric slab beneath the Banda arc, eastern Indonesia depicted by a seismic tomographic model

    Directory of Open Access Journals (Sweden)

    Sri Widiyantoro

    2011-10-01

    Full Text Available Seismic tomography with a non-linear approach has been successfully applied to image the P-wave velocity structure beneath the Banda arc in detail. Nearly one million compressional phases including the surfacereflected depth phases pP and pwP from events within the Indonesian region have been used. The depth phases have been incorporated in order to improve the sampling of the uppermantle structure, particularly below the Banda Sea in the back-arc regions. For the model parameterization, we have combined a highresolution regional inversion with a low-resolution global inversion to allow detailed images of slab structures within the study region and to minimize the mapping of distant aspherical mantle structure into the volume under study. In this paper, we focus our discussion on the upper mantle and transition zone structure beneath the curved Banda arc. The tomographic images confirm previous observations of the twisting of the slab in the upper mantle, forming a spoon-shaped structure beneath the Banda arc. A slab lying flat on the 660 km discontinuity beneath the Banda Sea is also well imaged. Further interpretations of the resulting tomograms and seismicity data support the scenario of the Banda arc subduction rollback.

  13. Employees' Job Satisfaction: A Test of the Job Characteristics Model Among Social Work Practitioners.

    Science.gov (United States)

    Blanz, Mathias

    2017-01-01

    The present article describes an investigation of the Job Characteristics Model (JCM) by Hackman and Oldham (1976) for the prediction of job satisfaction of employees in social work areas. While there is considerable evidence for the JCM with respect to profit-oriented organizations, it was tested whether it can also be applied to the non-profit sector. The present study surveyed 734 holders of jobs in social work in Germany in order to assess their job satisfaction and the core variables of the JCM (i.e., the five job characteristics and the three psychological states). Regression and mediation analyses were used to examine the relations between these variables. The results showed that the expected relations were remarkably in accordance with the findings from the for-profit sector. All model variables correlated positively with job satisfaction, with the psychological states showing higher coefficients than the job characteristics. In addition, the influence of job characteristics on job satisfaction was significantly mediated through the psychological states. These findings were supported by a replication study. Implications of the JCM for practice, in particular for assessment and interventions in social work organizations, are discussed.

  14. Psychometric properties of the "sport satisfaction instrument (SSI)" in female athletes: predictive model of sport commitment.

    Science.gov (United States)

    Granero-Gallegos, A; Baena-Extremera, A; Gómez-López, M; Abraldes, J A

    2014-08-01

    The objective of this research was to assess the psychometric properties of the Sport Satisfaction Instrument (SSI) in a Spanish sample of female athletes in team sports federations, to decide whether it constitutes a valid and reliable instrument to be used in the context of female competitive sport in future research. The SSI was administered to a total of 615 athletes from 12 to 38 yr. of age. Confirmatory procedures and psychometric analysis supported the hypothesized theoretical model of two factors (Satisfaction/fun and Boredom). For female athletes, the 7-item model showed better goodness-of-fit indexes upon eliminating Item 2 from the Boredom subscale. Concurrent validity was explored through the correlations with the Perception of Success Questionnaire and Sport Commitment, obtaining positive correlations between Satisfaction/fun and Task Orientation and Sport Commitment, whereas Boredom correlated positively but less closely with Ego Orientation. The importance of Satisfaction/fun in the prediction of Sport Commitment, starting from task orientation, is emphasized.

  15. Implementing Model-Check for Employee and Management Satisfaction

    Science.gov (United States)

    Jones, Corey; LaPha, Steven

    2013-01-01

    This presentation will discuss methods to which ModelCheck can be implemented to not only improve model quality, but also satisfy both employees and management through different sets of quality checks. This approach allows a standard set of modeling practices to be upheld throughout a company, with minimal interaction required by the end user. The presenter will demonstrate how to create multiple ModelCheck standards, preventing users from evading the system, and how it can improve the quality of drawings and models.

  16. Exploring the Effects of Congruence and Holland's Personality Codes on Job Satisfaction: An Application of Hierarchical Linear Modeling Techniques

    Science.gov (United States)

    Ishitani, Terry T.

    2010-01-01

    This study applied hierarchical linear modeling to investigate the effect of congruence on intrinsic and extrinsic aspects of job satisfaction. Particular focus was given to differences in job satisfaction by gender and by Holland's first-letter codes. The study sample included nationally represented 1462 female and 1280 male college graduates who…

  17. Exploring the Effects of Congruence and Holland's Personality Codes on Job Satisfaction: An Application of Hierarchical Linear Modeling Techniques

    Science.gov (United States)

    Ishitani, Terry T.

    2010-01-01

    This study applied hierarchical linear modeling to investigate the effect of congruence on intrinsic and extrinsic aspects of job satisfaction. Particular focus was given to differences in job satisfaction by gender and by Holland's first-letter codes. The study sample included nationally represented 1462 female and 1280 male college graduates who…

  18. A Novel Contextual Information Recommendation Model and Its Application in e-Commerce Customer Satisfaction Management

    OpenAIRE

    Feipeng Guo; Qibei Lu

    2015-01-01

    In the current supply chain environment, distributed cognition theory tells us that various types of context information in which a recommendation is provided are important for e-commerce customer satisfaction management. However, traditional recommendation model does not consider the distributed and differentiated impact of different contexts on user needs, and it also lacks adaptive capacity of contextual recommendation service. Thus, a contextual information recommendation model based on ...

  19. 基于ArcPy的GIS空间分析建模原理及实现方法%The Rationale and Implementation Approach of GIS Spatial Analysis Modeling Based on ArcPy

    Institute of Scientific and Technical Information of China (English)

    张世富

    2015-01-01

    The rationale of GIS Spatial Analysis Modeling is presented by adopting the functional programming of the Python Programming Language, based on the ArcPy Module of ArcGIS10.0, while the implementation approach is illustrated by the optimized segmentation results of the object-based image.%采用ArcGIS10.0中ArcPy模块并使用Python编程语言以函数式编程的方法进行GIS空间分析建模的原理,并以基于对象的影像最优分割结果选取为例介绍其具体实现方法。

  20. A Theoretical Model of Arc Light Radiation Based on GTA Spectral Diagnosis

    Institute of Scientific and Technical Information of China (English)

    Chenming XU; Hongming GAO; Guangjun ZHANG; Lin WU

    2003-01-01

    An arc light radiation phenomenon in TIG welding process was studied through experiments and theoretical analysis.The arc spectra were acquired under a variety of welding parameters from 200 nm to 1000 nm wavelength rangein TIG. The influence of welding p

  1. The Impact of Cocreation on the Student Satisfaction: Analysis through Structural Equation Modeling

    Directory of Open Access Journals (Sweden)

    Odette Pantoja Díaz

    2016-01-01

    Full Text Available The objective of this study is to apply the cocreation initiative as a marketing tool in the context of university undergraduate programs. Considering that cocreation is a practice that involves stakeholders in different phases of product production or service, this research analyzes the interactions between some of the factors during the cocreation process as students collaborate with the university. These factors are participation, communication, cocreation, and satisfaction, and this study focuses on how they fuse together at the moment of cocreation. After a literature review, which supplied the basis for creating a model, we used exploratory and confirmatory factor analysis and structural equation modeling to validate the hypothesized relations between the variables; finally, the proposed cocreation model was verified. The results could empower academic institutions to develop managerial strategies in order to increase students’ collaboration and satisfaction.

  2. [Analysis of burnout and job satisfaction among nurses based on the Job Demand-Resource Model].

    Science.gov (United States)

    Yom, Young-Hee

    2013-02-01

    The purpose of this study was to examine burnout and job satisfaction among nurses based on Job Demand-Resource Model. A survey using a structured questionnaire was conducted with 464 hospital nurses. Analysis of data was done with both SPSS Win 17.0 for descriptive statistics and AMOS 18.0 for the structural equation model. The hypothetical model yielded the following Chi-square=34.13 (p = effect on emotional exhaustion (β = 0.39), whereas supervisor support had direct effects on emotional exhaustion (β = -0.24), depersonalization (β = -0.11), and low personal accomplishment (β = -0.22). Emotional exhaustion (β = -0.42), depersonalization (β = -0.11) and low personal accomplishment (β = -0.36) had significant direct effects on job satisfaction. The results suggest that nurses' workload should be decreased and supervisor's support should be increased in order to retain nurses. Further study with a longitudinal design is necessary.

  3. Modeling of Structural Equation Teachers’ Job satisfaction in Agricultural High School, Mazandaran Province, Iran

    Directory of Open Access Journals (Sweden)

    M. Alikhani Dadoukolaei

    2015-05-01

    Full Text Available Job satisfaction is a positive or pleasant emotional state resulting from a person’s appreciation of his/her own job or experience. The study purpose was to model job satisfaction for teachers working in Agricultural institutes within Mazandaran province of Iran. The study used a descriptive-correlative design . The statistical population (including all instructors working for agricultural Institutes within Mazandaran Province of Iran was es 127 teachers. Using Cochran’s formula, the sample size was estimated at 85 teachers. To increase the viability of the study, the planned sample size was determined att 110 teachers from which 108 teachers completed the questionnaires. The study was conducted using questionnaire. The content validity of the questionnaire was assessed by a group of extension specialists. In order to measure the reliability of research questionnaires, 29 teachers who were randomly selected. completed some questionnaires. Cronbach's alpha, ordinal theta and combination reliability were calculated by 0.95, 0.92 and 0.87 respectively. The results indicate that the magnitude of job satisfaction for %85.2 of instructors working in Agricultural institutes within Mazandaran province was moderate and relatively high. Based on the estimated Structural equation model, the highest effect on the job satisfaction was related to the environmental factor with the path coefficient of 0.64. Motivational factor with the path coefficient of 0.26 had a significant effect on job satisfaction. In addition, the environmental factor with the path coefficient of 0.55 had a significant effect on the Motivational factor.

  4. Polar cap arcs from the magnetosphere to the ionosphere: kinetic modelling and observations by Cluster and TIMED

    Directory of Open Access Journals (Sweden)

    R. Maggiolo

    2012-02-01

    Full Text Available On 1 April 2004 the GUVI imager onboard the TIMED spacecraft spots an isolated and elongated polar cap arc. About 20 min later, the Cluster satellites detect an isolated upflowing ion beam above the polar cap. Cluster observations show that the ions are accelerated upward by a quasi-stationary electric field. The field-aligned potential drop is estimated to about 700 V and the upflowing ions are accompanied by a tenuous population of isotropic protons with a temperature of about 500 eV.

    The magnetic footpoints of the ion outflows observed by Cluster are situated in the prolongation of the polar cap arc observed by TIMED GUVI. The upflowing ion beam and the polar cap arc may be different signatures of the same phenomenon, as suggested by a recent statistical study of polar cap ion beams using Cluster data.

    We use Cluster observations at high altitude as input to a quasi-stationary magnetosphere-ionosphere (MI coupling model. Using a Knight-type current-voltage relationship and the current continuity at the topside ionosphere, the model computes the energy spectrum of precipitating electrons at the top of the ionosphere corresponding to the generator electric field observed by Cluster. The MI coupling model provides a field-aligned potential drop in agreement with Cluster observations of upflowing ions and a spatial scale of the polar cap arc consistent with the optical observations by TIMED. The computed energy spectrum of the precipitating electrons is used as input to the Trans4 ionospheric transport code. This 1-D model, based on Boltzmann's kinetic formalism, takes into account ionospheric processes such as photoionization and electron/proton precipitation, and computes the optical and UV emissions due to precipitating electrons. The emission rates provided by the Trans4 code are compared to the optical observations by TIMED. They are similar in size and intensity. Data and modelling results are consistent with the

  5. Presentation and Model Review of Customer Relationship Management (Crm to Enhance Customer Satisfaction and Loyalty

    Directory of Open Access Journals (Sweden)

    Mojtaba Heravi

    2016-06-01

    Full Text Available After the Industrial Revolution, fundamental change in all aspects of trade and business appeared. The traditional strategy given replaced by new strategy and managers of commercial and production such as Electric Power Distribution Company (EPDC in order to compete to gain greater market share rather than product focused to customer centric have turned. The impact of customer satisfaction and loyalty in increasing of profitability have motivated for organizations up to customer relationship management (CRM as an important instrument to find trends. More review and knowledge discovery are provides useful information and better understanding for EPDC manager’s in the field of CRM on how to deal with customers. For this reason, in this paper, presentation and model review of CRM has been to enhance customer satisfaction and loyalty in EPDC. The results showed that behavior of employees, quality of service and products, and the development of communication, have been positive and significant impact on customer satisfaction and loyalty, but interactive management on customer satisfaction and loyalty will not have much impact.

  6. The giant arc statistics in the three year WMAP cosmological model

    CERN Document Server

    Li, G L; Jing, Y P; Mo, H J; Gao, L; Lin, W P

    2006-01-01

    We use high-resolution $N$-body simulations to investigate the optical depth of giant arcs with length-to-width ratio larger than 7.5 and 10 in the `standard' $\\LCDM$ model with $\\sigma_8=0.9$ and $\\Omega_{\\rm m,0}=0.3$ and a model based on three-year Wilkinson Microwave Anisotropy Probe (WMAP) data. We find that, in dark-matter only simulations, the lensing probability in the three-year WMAP model (with $\\sigma_8=0.74$ and $\\Omega_{\\rm m,0}=0.238)$ decreases by a factor of $\\sim 6$ compared with that in the `standard' $\\LCDM$ model. The effects of baryonic cooling, star formation and feedbacks are uncertain, but we argue that baryons will only increase the the lensing cross-section by a moderate factor, $\\sim 2$. We conclude that the low central value of $\\sigma_8$ and $\\Omega_{\\rm m,0}$ preferred by the WMAP three-year data may be too low to be compatible with observations if conventional assumptions of the background source population are correct.

  7. Preliminary Results from Electric Arc Furnace Off-Gas Enthalpy Modeling

    Energy Technology Data Exchange (ETDEWEB)

    Nimbalkar, Sachin U [ORNL; Thekdi, Arvind [E3M Inc; Keiser, James R [ORNL; Storey, John Morse [ORNL

    2015-01-01

    This article describes electric arc furnace (EAF) off-gas enthalpy models developed at Oak Ridge National Laboratory (ORNL) to calculate overall heat availability (sensible and chemical enthalpy) and recoverable heat values (steam or power generation potential) for existing EAF operations and to test ORNL s new EAF waste heat recovery (WHR) concepts. ORNL s new EAF WHR concepts are: Regenerative Drop-out Box System and Fluidized Bed System. The two EAF off-gas enthalpy models described in this paper are: 1.Overall Waste Heat Recovery Model that calculates total heat availability in off-gases of existing EAF operations 2.Regenerative Drop-out Box System Model in which hot EAF off-gases alternately pass through one of two refractory heat sinks that store heat and then transfer it to another gaseous medium These models calculate the sensible and chemical enthalpy of EAF off-gases based on the off-gas chemical composition, temperature, and mass flow rate during tap to tap time, and variations in those parameters in terms of actual values over time. The models provide heat transfer analysis for the aforementioned concepts to confirm the overall system and major component sizing (preliminary) to assess the practicality of the systems. Real-time EAF off-gas composition (e.g., CO, CO2, H2, and H2O), volume flow, and temperature data from one EAF operation was used to test the validity and accuracy of the modeling work. The EAF off-gas data was used to calculate the sensible and chemical enthalpy of the EAF off-gases to generate steam and power. The article provides detailed results from the modeling work that are important to the success of ORNL s EAF WHR project. The EAF WHR project aims to develop and test new concepts and materials that allow cost-effective recovery of sensible and chemical heat from high-temperature gases discharged from EAFs.

  8. An automated model for rooftop PV systems assessment in ArcGIS using LIDAR

    Directory of Open Access Journals (Sweden)

    Mesude Bayrakci Boz

    2015-08-01

    Full Text Available As photovoltaic (PV systems have become less expensive, building rooftops have come to be attractive for local power production. Identifying rooftops suitable for solar energy systems over large geographic areas is needed for cities to obtain more accurate assessments of production potential and likely patterns of development. This paper presents a new method for extracting roof segments and locating suitable areas for PV systems using Light Detection and Ranging (LIDAR data and building footprints. Rooftop segments are created using seven slope (tilt, ve aspect (azimuth classes and 6 different building types. Moreover, direct beam shading caused by nearby objects and the surrounding terrain is taken into account on a monthly basis. Finally, the method is implemented as an ArcGIS model in ModelBuilder and a tool is created. In order to show its validity, the method is applied to city of Philadelphia, PA, USA with the criteria of slope, aspect, shading and area used to locate suitable areas for PV system installation. The results show that 33.7% of the buildings footprints areas and 48.6% of the rooftop segments identi ed is suitable for PV systems. Overall, this study provides a replicable model using commercial software that is capable of extracting individual roof segments with more detailed criteria across an urban area.

  9. Computational Modeling of Microstructural-Evolution in AISI 1005 Steel During Gas Metal Arc Butt Welding

    Science.gov (United States)

    Grujicic, M.; Ramaswami, S.; Snipes, J. S.; Yavari, R.; Arakere, A.; Yen, C.-F.; Cheeseman, B. A.

    2013-05-01

    A fully coupled (two-way), transient, thermal-mechanical finite-element procedure is developed to model conventional gas metal arc welding (GMAW) butt-joining process. Two-way thermal-mechanical coupling is achieved by making the mechanical material model of the workpiece and the weld temperature-dependent and by allowing the potential work of plastic deformation resulting from large thermal gradients to be dissipated in the form of heat. To account for the heat losses from the weld into the surroundings, heat transfer effects associated with natural convection and radiation to the environment and thermal-heat conduction to the adjacent workpiece material are considered. The procedure is next combined with the basic physical-metallurgy concepts and principles and applied to a prototypical (plain) low-carbon steel (AISI 1005) to predict the distribution of various crystalline phases within the as-welded material microstructure in different fusion zone and heat-affected zone locations, under given GMAW-process parameters. The results obtained are compared with available open-literature experimental data to provide validation/verification for the proposed GMAW modeling effort.

  10. Mathematical modelling of convective processes in a weld pool under electric arc surfacing

    Science.gov (United States)

    Sarychev, V. D.; Granovskii, A. Yu; Nevskii, S. A.; Konovalov, S. V.

    2017-01-01

    The authors develop the mathematical model of convective processes in a molten pool under electric arc surfacing with flux-cored wire. The model is based on the ideas of how convective flows appear due to temperature gradient and action of electromagnetic forces. Influence of alloying elements in the molten metal was modeled as a non-linear dependence of surface tension upon temperature. Surface tension and its temperature coefficient were calculated according to the electron density functional method with consideration to asymmetric electron distribution at the interface “molten metal / shielding gas”. Simultaneous solution of Navier-Stokes and Maxwell equations according to finite elements method with consideration to the moving heat source at the interface showed that there is a multi-vortex structure in the molten metal. This structure gives rise to a downward heat flux which, at the stage of heating, moves from the centre of the pool and stirs it full width. At the cooling stage this flux moves towards the centre of the pool and a single vortex is formed near the symmetry centre. This flux penetration is ∼ 10 mm. Formation of the downward heat flux is determined by sign reversal of the temperature coefficient of surface tension due to the presence of alloying elements.

  11. Light and short arc rubs in rotating machines: Experimental tests and modelling

    Science.gov (United States)

    Pennacchi, P.; Bachschmid, N.; Tanzi, E.

    2009-10-01

    Rotor-to-stator rub is a non-linear phenomenon which has been analyzed many times in rotordynamics literature, but very often these studies are devoted simply to highlight non-linearities, using very simple rotors, rather than to present reliable models. However, rotor-to-stator rub is actually one of the most common faults during the operation of rotating machinery. The frequency of its occurrence is increasing due to the trend of reducing the radial clearance between the seal and the rotor in modern turbine units, pumps and compressors in order to increase efficiency. Often the rub occurs between rotor and seals and the analysis of the phenomenon cannot set aside the consideration of the different relative stiffness. This paper presents some experimental results obtained by means of a test rig in which rub conditions of real machines are reproduced. In particular short arc rubs are considered and the shaft is stiffer than the obstacle. Then a model, suitable to be employed for real rotating machinery, is presented and the simulations obtained are compared with the experimental results. The model is able to reproduce the behaviour of the test rig.

  12. Cathodic arcs

    Energy Technology Data Exchange (ETDEWEB)

    Anders, Andre

    2003-10-29

    Cathodic arc plasma deposition has become the technology of choice for hard, wear and corrosion resistant coatings for a variety of applications. The history, basic physics of cathodic arc operation, the infamous macroparticle problem and common filter solutions, and emerging high-tech applications are briefly reviewed. Cathodic arc plasmas standout due to their high degree of ionization, with important consequences for film nucleation, growth, and efficient utilization of substrate bias. Industrial processes often use cathodic arc plasma in reactive mode. In contrast, the science of arcs has focused on the case of vacuum arcs. Future research directions include closing the knowledge gap for reactive mode, large area coating, linear sources and filters, metal plasma immersion process, with application in high-tech and biomedical fields.

  13. An integrated user-friendly ArcMAP tool for bivariate statistical modelling in geoscience applications

    Science.gov (United States)

    Jebur, M. N.; Pradhan, B.; Shafri, H. Z. M.; Yusoff, Z. M.; Tehrany, M. S.

    2015-03-01

    Modelling and classification difficulties are fundamental issues in natural hazard assessment. A geographic information system (GIS) is a domain that requires users to use various tools to perform different types of spatial modelling. Bivariate statistical analysis (BSA) assists in hazard modelling. To perform this analysis, several calculations are required and the user has to transfer data from one format to another. Most researchers perform these calculations manually by using Microsoft Excel or other programs. This process is time-consuming and carries a degree of uncertainty. The lack of proper tools to implement BSA in a GIS environment prompted this study. In this paper, a user-friendly tool, bivariate statistical modeler (BSM), for BSA technique is proposed. Three popular BSA techniques, such as frequency ratio, weight-of-evidence (WoE), and evidential belief function (EBF) models, are applied in the newly proposed ArcMAP tool. This tool is programmed in Python and created by a simple graphical user interface (GUI), which facilitates the improvement of model performance. The proposed tool implements BSA automatically, thus allowing numerous variables to be examined. To validate the capability and accuracy of this program, a pilot test area in Malaysia is selected and all three models are tested by using the proposed program. Area under curve (AUC) is used to measure the success rate and prediction rate. Results demonstrate that the proposed program executes BSA with reasonable accuracy. The proposed BSA tool can be used in numerous applications, such as natural hazard, mineral potential, hydrological, and other engineering and environmental applications.

  14. A Monte Carlo model of the Varian IGRT couch top for RapidArc QA.

    Science.gov (United States)

    Teke, T; Gill, B; Duzenli, C; Popescu, I A

    2011-12-21

    The objectives of this study are to evaluate the effect of couch attenuation on quality assurance (QA) results and to present a couch top model for Monte Carlo (MC) dose calculation for RapidArc treatments. The IGRT couch top is modelled in Eclipse as a thin skin of higher density material with a homogeneous fill of foam of lower density and attenuation. The IGRT couch structure consists of two longitudinal sections referred to as thick and thin. The Hounsfield Unit (HU) characterization of the couch structure was determined using a cylindrical phantom by comparing ion chamber measurements with the dose predicted by the treatment planning system (TPS). The optimal set of HU for the inside of the couch and the surface shell was found to be respectively -960 and -700 HU in agreement with Vanetti et al (2009 Phys. Med. Biol. 54 N157-66). For each plan, the final dose calculation was performed with the thin, thick and without the couch top. Dose differences up to 2.6% were observed with TPS calculated doses not including the couch and up to 3.4% with MC not including the couch and were found to be treatment specific. A MC couch top model was created based on the TPS geometrical model. The carbon fibre couch top skin was modelled using carbon graphite; the density was adjusted until good agreement with experimental data was observed, while the density of the foam inside was kept constant. The accuracy of the couch top model was evaluated by comparison with ion chamber measurements and TPS calculated dose combined with a 3D gamma analysis. Similar to the TPS case, a single graphite density can be used for both the thin and thick MC couch top models. Results showed good agreement with ion chamber measurements (within 1.2%) and with TPS (within 1%). For each plan, over 95% of the points passed the 3D gamma test.

  15. An integrated user-friendly ArcMAP tool for bivariate statistical modeling in geoscience applications

    Directory of Open Access Journals (Sweden)

    M. N. Jebur

    2014-10-01

    Full Text Available Modeling and classification difficulties are fundamental issues in natural hazard assessment. A geographic information system (GIS is a domain that requires users to use various tools to perform different types of spatial modeling. Bivariate statistical analysis (BSA assists in hazard modeling. To perform this analysis, several calculations are required and the user has to transfer data from one format to another. Most researchers perform these calculations manually by using Microsoft Excel or other programs. This process is time consuming and carries a degree of uncertainty. The lack of proper tools to implement BSA in a GIS environment prompted this study. In this paper, a user-friendly tool, BSM (bivariate statistical modeler, for BSA technique is proposed. Three popular BSA techniques such as frequency ratio, weights-of-evidence, and evidential belief function models are applied in the newly proposed ArcMAP tool. This tool is programmed in Python and is created by a simple graphical user interface, which facilitates the improvement of model performance. The proposed tool implements BSA automatically, thus allowing numerous variables to be examined. To validate the capability and accuracy of this program, a pilot test area in Malaysia is selected and all three models are tested by using the proposed program. Area under curve is used to measure the success rate and prediction rate. Results demonstrate that the proposed program executes BSA with reasonable accuracy. The proposed BSA tool can be used in numerous applications, such as natural hazard, mineral potential, hydrological, and other engineering and environmental applications.

  16. Examining Competing Models of Transformational Leadership, Leadership Trust, Change Commitment, and Job Satisfaction.

    Science.gov (United States)

    Yang, Yi-Feng

    2016-08-01

    This study discusses the influence of transformational leadership on job satisfaction through assessing six alternative models related to the mediators of leadership trust and change commitment utilizing a data sample (N = 341; M age = 32.5 year, SD = 5.2) for service promotion personnel in Taiwan. The bootstrap sampling technique was used to select the better fitting model. The tool of hierarchical nested model analysis was applied, along with the approaches of bootstrapping mediation, PRODCLIN2, and structural equation modeling comparison. The results overall demonstrate that leadership is important and that leadership role identification (trust) and workgroup cohesiveness (commitment) form an ordered serial relationship.

  17. DEPICT: A High-level Formal Language for Modeling Constraint Satisfaction Problems

    Institute of Scientific and Technical Information of China (English)

    Abdulwahed M. Abbas; Edward P. K. Tsang; Ahmad H. Nasri

    2008-01-01

    The past decade witnessed rapid development of constraint satisfaction technologies, where algorithms are now able to cope with larger and harder problems. However, owing to the fact that constraints are inherently declarative, attention is quickly turning toward developing high-level programming languages within which such problems can be modeled and also solved. Along these lines, this paper presents DEPICT, the language. Its use is illustrated through modeling a number of benchmark examples. The paper continues with a description of a prototype system within which such models may be interpreted. The paper concludes with a description of a sample run of this interpreter showing how a problem modeled as such is typically solved.

  18. Cathodic arcs

    OpenAIRE

    Anders, Andre

    2003-01-01

    Cathodic arc plasma deposition has become the technology of choice for hard, wear and corrosion resistant coatings for a variety of applications. The history, basic physics of cathodic arc operation, the infamous macroparticle problem and common filter solutions, and emerging high-tech applications are briefly reviewed. Cathodic arc plasmas stand out due to their high degree of ionization, with important consequences for film nucleation, growth, and efficient utilization of substrate bia...

  19. A Support Vector Machine-based Evaluation Model of Customer Satisfaction Degree in Logistics

    Institute of Scientific and Technical Information of China (English)

    SUN Hua-li; XIE Jian-ying

    2007-01-01

    This paper pressnts a novel evaluation model of the customer satisfaction degree (CSD) in logistics based on support vector machine (SVM). Firstly, the relation between the suppliers and the customers is analyzed. Secondly, the evaluation index system and fuzzy quantitative methods are provided. Thirdly, the CSD evaluation system including eight indexes and three ranks rinsed on one-against-one mode of SVM is built. Last simulation experiment is presented to illustrate the theoretical results.

  20. Hierarchical Linear Modeling to Explore the Influence of Satisfaction with Public Facilities on Housing Prices

    OpenAIRE

    Chung-Chang Lee

    2009-01-01

    This paper uses hierarchical linear modeling (HLM) to explore the influence of satisfaction with public facilities on both individual residential and overall (or regional) levels on housing prices. The empirical results indicate that the average housing prices between local cities and counties exhibit significant variance. At the macro level, the explanatory power of the variable ¡§convenience of life¡¨ on the average housing prices of all counties and cities reaches the 5% significance level...

  1. Physics-Based Modeling of Electric Operation, Heat Transfer, and Scrap Melting in an AC Electric Arc Furnace

    Science.gov (United States)

    Opitz, Florian; Treffinger, Peter

    2016-04-01

    Electric arc furnaces (EAF) are complex industrial plants whose actual behavior depends upon numerous factors. Due to its energy intensive operation, the EAF process has always been subject to optimization efforts. For these reasons, several models have been proposed in literature to analyze and predict different modes of operation. Most of these models focused on the processes inside the vessel itself. The present paper introduces a dynamic, physics-based model of a complete EAF plant which consists of the four subsystems vessel, electric system, electrode regulation, and off-gas system. Furthermore the solid phase is not treated to be homogenous but a simple spatial discretization is employed. Hence it is possible to simulate the energy input by electric arcs and fossil fuel burners depending on the state of the melting progress. The model is implemented in object-oriented, equation-based language Modelica. The simulation results are compared to literature data.

  2. Petrogenesis of Oceanic Crust at Back-Arc Spreading Centers: Modeling the Effects of Slab-Derived Water on Crustal Accretion in the Lau Basin

    Science.gov (United States)

    Eason, D. E.; Dunn, R. A.

    2014-12-01

    Oceanic crust formed along spreading centers in the Lau back-arc basin exhibits a dramatic change in crustal structure and composition with proximity to the nearby Tofua Arc. Results from seismic studies indicate that crust formed near the arc is abnormally thick (~8-9 km) and compositionally stratified, with a thick low-velocity upper crust and an abnormally high-velocity (7.2-7.4+ km/s) lower crust. Lava samples from this area show arc-like compositional enrichments and tend to be more evolved than typical mid-ocean ridge basalts (MgO contents as low as ~1 wt%). We propose that slab-derived water entrained in the near-arc ridge system not only enhances mantle melting, as commonly proposed to explain high crustal production in back-arc environments, but also affects magmatic differentiation and crustal accretion processes. Phase equilibria modeling of the observed compositional trends suggests that the high water contents found in near-arc parental melts can lead to crystallization of an unusually mafic cumulate layer by suppressing plagioclase crystallization relative to olivine and clinopyroxene. Model runs with ~1-2 wt% H2O in the parental melts successfully reproduce the geochemical trends of the erupted lavas while crystallizing a cumulate assemblage with calculated seismic velocities consistent with those observed in the near-arc lower crust. The resulting residual melts are also water-rich, which lowers their density and aids in the extraction and eventual eruption of unusually evolved magmas. We present preliminary results of this petrological model for the formation of back-arc oceanic crust, which successfully predicts the unusual crustal stratification observed in the near-arc regions of the Lau basin, and helps explain the highly fractionated andesites and dacites that erupt there. We also comment on alternative proposed hypotheses for back-arc crustal accretion and discuss some of the challenges facing them in this particular region.

  3. Level of paranormal beliefs and its relationship with explanatory models, treatment adherence and satisfaction

    Directory of Open Access Journals (Sweden)

    Dushad Ram

    2016-06-01

    Full Text Available Abstract Background Paranormal beliefs are common among patients with mental illness. Such beliefs may mediate conceptualization of illness, treatment satisfaction and medication adherence. Objective To study the level of paranormal beliefs and its relationship with explanatory models, treatment adherence and satisfaction using standardized assessment tool. Methods Eighty nine patients with mental illness in remission were assessed with Sociodemographic proforma, Revised Paranormal Belief Scale (RPBS, Mental Distress Explanatory Model Questionnaire (MMAS, Morisky Medication Adherence Scale (MMAS and Short Assessment of Patient Satisfaction (SAPS. Results Results revealed a high level of paranormal beliefs on RPBS (Mean 83.96, SD ± 23.91. Variables that had a statistically significant group difference on the score of RPBS were domicile status (p < 05, diagnosis (p < 001, method of treatment sought before (p < 001. In a linear regression analysis four variables explained 35.4% of the variance (R2 = .38, R2Adjusted = .35, F = 13.04, p < .001 in RPBS Score. These variables were total score of MDEMQ (Beta = .308, t = 3.435, p < .001, total score of MMAS (beta = .357, t = 3. 716, p < .001 and magico-religious treatment received earlier (beta = .306, t = 3.52, p < .001 and SAPS. Discussion Based on the finding of this study, it may be concluded that the level of paranormal beliefs may vary with some demographic variables. Levels of paranormal beliefs is positively associated with explanatory models and adherence in patients with mental illness in remission.

  4. Model of phosphorus precipitation and crystal formation in electric arc furnace steel slag filters.

    Science.gov (United States)

    Claveau-Mallet, Dominique; Wallace, Scott; Comeau, Yves

    2012-02-07

    The objective of this study was to develop a phosphorus retention mechanisms model based on precipitation and crystallization in electric arc furnace slag filters. Three slag columns were fed during 30 to 630 days with a reconstituted mining effluent at different void hydraulic retention times. Precipitates formed in columns were characterized by X-ray diffraction and transmission electronic microscopy. The proposed model is expressed in the following steps: (1) the rate limiting dissolution of slag is represented by the dissolution of CaO, (2) a high pH in the slag filter results in phosphorus precipitation and crystal growth, (3) crystal retention takes place by filtration, settling and growth densification, (4) the decrease in available reaction volume is caused by crystal and other particulate matter accumulation (and decrease in available reaction time), and (5) the pH decreases in the filter over time if the reaction time is too low (which results in a reduced removal efficiency). Crystal organization in a slag filter determines its phosphorus retention capacity. Supersaturation and water velocity affect crystal organization. A compact crystal organization enhances the phosphorus retention capacity of the filter. A new approach to define filter performance is proposed: saturation retention capacity is expressed in units of mg P/mL voids.

  5. Developing a geological 3D model for the Tanour and Rasoun spring catchment area using ArcGIS and GOCAD

    Science.gov (United States)

    Hamdan, Ibraheem; Benhsinat, Mohamed; Wagner, Bianca; Sauter, Martin

    2016-04-01

    Key words: Karst, 3D model, GOCAD, ArcGIS, Jordan. Tanour and Rasoun karst springs (around 75 km northwest of the capital city of Amman in Jordan) are used as main local water supply for the surrounding villages. Carbonate rocks are the predominant rock type in the study area (Upper Cretaceous age). The karstification degree is moderate to high, with the availability of different karst features like dolines, caves, dry valleys, and highly fractured rocks. During the last years, the water supply from these springs had to be disconnected for several times due to microbial contamination and waste water pollution from local olive oil mills. For better understanding of the geological and the hydrogeological setting of the study area, in addition to the delineation of the groundwater catchment area for Tanour and Rasoun springs, a geological 3D model of the main geological formations within the study area was established using ArcGIS and GOCAD. The model is based on geological maps and well data; it was established for seven geological layers that act as prominent aquifers and aquicludes. ArcGIS software was used for data preparation, processing and interpolation of varying thickness, while GOCAD used for geometrical modeling steps. After the completion of the first modeling steps, major faults are included. Then the subsurface catchments will be delineated and compared with the superficial watersheds. The model still under development and open for further development.

  6. 配电网单相接地电弧建模及仿真分析研究%Modeling and simulation analysis of arc in distribution network

    Institute of Scientific and Technical Information of China (English)

    许晔; 郭谋发; 陈彬; 杨耿杰

    2015-01-01

    Studies on modeling and simulation of arc help to choose arc-extinction methods and line-selection methods in distribution network. Four kinds of arc mathematical equations are given such as Cassie, Mayr, Schwarz and the cybernetic model. Mayr, Schwarz and the cybernetic model are suitable for describing the arc characteristics when the grounding current is small. The arc model of Schwarz and the cybernetics is established, and these two models are compared using a test circuit of arc characteristics. The cybernetic model can set arc length, reflect the arc fault conditions and apply to simulation of single-phase arc grounding fault in resonant earthed system. The resonance earthed system model and the cybernetic model are established by ATP-EMTP, and the effect of arc length on arc impedance, steady and transient arc characteristics is analyzed. The results show that the cybernetic model is more intuitive and accurate to simulate arc grounding fault in resonant earthed system.%为选择有效的配电网接地消弧措施及选线方法,有必要进行电弧建模及仿真研究。给出Cassie、Mayr、Schwarz、控制论等四种电弧模型的数学方程,其中Mayr、Schwarz、控制论等三种电弧模型适合描述接地电流较小的电弧的故障特征。建立Schwarz和控制论电弧仿真模型,并利用电弧特性测试电路对这两种模型做仿真对比分析。控制论模型因能直接设置弧长,直观地反映配电线路故障拉弧情况,更适用于谐振接地系统单相弧光接地故障仿真研究。采用ATP-EMTP软件建立谐振接地系统模型和控制论电弧模型,分析了不同电弧长度对电弧阻抗、接地电弧稳态和暂态特性的影响。仿真结果表明,利用控制论电弧模型可较直观且准确地仿真谐振接地系统弧光接地故障。

  7. Parameters optimization of hybrid fiber laser-arc butt welding on 316L stainless steel using Kriging model and GA

    Science.gov (United States)

    Gao, Zhongmei; Shao, Xinyu; Jiang, Ping; Cao, Longchao; Zhou, Qi; Yue, Chen; Liu, Yang; Wang, Chunming

    2016-09-01

    It is of great significance to select appropriate welding process parameters for obtaining optimal weld geometry in hybrid laser-arc welding. An integrated optimization approach by combining Kriging model and GA is proposed to optimize process parameters. A four-factor, five-level experiment using Taguchi L25 is conducted considering laser power (P), welding current (A), distance between laser and arc (D) and traveling speed (V). Kriging model is adopted to approximate the relationship between process parameters and weld geometry, namely depth of penetration (DP), bead width (BW) and bead reinforcement (BR). The constructed Kriging model was used for parameters optimization by GA to maximize DP, minimize BW and ensure BR at a desired value. The effects of process parameters on weld geometry are analyzed. Microstructure and micro-hardness are also discussed. Verification experiments demonstrate that the obtained optimum values are in good agreement with experimental results.

  8. Circular-Arc Cartograms

    CERN Document Server

    Kämper, Jan-Hinrich; Nöllenburg, Martin

    2011-01-01

    We present a new circular-arc cartogram model in which countries are drawn with circular arcs instead of straight-line segments. Given a geographic map and values associated with each country in the map, the cartogram is a new map in which the areas of the countries represent the corresponding values. In the circular-arc cartogram model straight-line segments can be replaced with circular arcs in order to achieve the desired areas, while the corners of the polygons defining each country remain fixed. The countries in circular-arc cartograms have the aesthetically pleasing appearance of clouds or snowflakes, depending on whether their edges are bent outwards or inwards. This makes is easy to determine whether a country has grown or shrunk, just by its overall shape. We show that determining whether a given map and area-values can be realized with a circular-arc cartogram is an NP-hard problem. Next we describe a heuristic method for constructing circular-arc cartograms, which uses a max-flow computation on the...

  9. An empirical model for the study of employee paticipation and its influence on job satisfaction

    Directory of Open Access Journals (Sweden)

    Lucas Joan Pujol Cols

    2015-12-01

    Full Text Available This article provides an analysis of the factors that influence the employee’s possibilities perceived to trigger actions of meaningful participation in three levels: Intra-group Level, Institutional Level and directly in the Leadership team of of the organization.Twelve (12 interviews were done with teachers from the Social and Economic Sciences School of the Mar del Plata (Argentina University, with different positions, areas and working hours.Based on qualitative evidence, an empirical model was constructed claiming to connect different factors for each manifest of participation, establishing hypothetical relations between subgroups.Additionally, in this article the implication of participation, its relationship with the job satisfaction and the role of individual expectations on the participation opportunities that receives each employee, are discussed. Keywords: Participation, Job satisfaction, University, Expectations, Qualitative Analysis. 

  10. Industry growth, work role characteristics, and job satisfaction: a cross-level mediation model.

    Science.gov (United States)

    Ford, Michael T; Wooldridge, Jessica D

    2012-10-01

    The associations between industry revenue growth, individual work role characteristics, and job satisfaction were examined in this cross-level mediation analysis. Work roles were expected to be more autonomous, involve greater skill variety, and offer more opportunities for growth and development for workers in growing industries than for workers in declining industries. Supervisor support was also hypothesized to be stronger for workers in high-growth industries. Results from a nationally representative (U.S.) sample of service industry workers, using multilevel modeling, supported these propositions and suggest that job enrichment mediates relations between industry growth and job satisfaction. Associations between industry growth and autonomy were also stronger among workers in occupations that are less normatively autonomous, suggesting that industry growth fosters a weakening, and industry decline a strengthening, of traditional differences in autonomy across work roles. These results contribute to a multilevel perspective on organizational environments, individual work roles, and worker attitudes and well-being.

  11. Modeling Employee Satisfaction in Relation to CSR Practices and Attraction and Retention of Top Talent

    Directory of Open Access Journals (Sweden)

    Simona VINEREAN

    2013-12-01

    Full Text Available In today’s economy, companies must work harder than ever to attract, retain and motivate talented employees in order to foster employee satisfaction, and in order to do so, CSR practices can provide a strategic tool. A green company no longer denotes solely the promotion of green products or reduction of energy consumption, as it has to incorporate proactive and innovative means of tracking sustainability while involving employees in such corporate behavior. This paper highlights an empirical study of responses from 10 multinational companies regarding their corporate social responsibility initiatives as a way to attract and retain good employees, while providing an appropriate environment for employee satisfaction, by constructing a structural equation model meant to expand HR literature and provide direct implications for organizations.

  12. Utilizing ARC EMCS Seedling Cassettes as Highly Versatile Miniature Growth Chambers for Model Organism Experiments

    Science.gov (United States)

    Freeman, John L.; Steele, Marianne K.; Sun, Gwo-Shing; Heathcote, David; Reinsch, S.; DeSimone, Julia C.; Myers, Zachary A.

    2014-01-01

    The aim of our ground testing was to demonstrate the capability of safely putting specific model organisms into dehydrated stasis, and to later rehydrate and successfully grow them inside flight proven ARC EMCS seedling cassettes. The ARC EMCS seedling cassettes were originally developed to support seedling growth during space flight. The seeds are attached to a solid substrate, launched dry, and then rehydrated in a small volume of media on orbit to initiate the experiment. We hypothesized that the same seedling cassettes should be capable of acting as culture chambers for a wide range of organisms with minimal or no modification. The ability to safely preserve live organisms in a dehydrated state allows for on orbit experiments to be conducted at the best time for crew operations and more importantly provides a tightly controlled physiologically relevant growth experiment with specific environmental parameters. Thus, we performed a series of ground tests that involved growing the organisms, preparing them for dehydration on gridded Polyether Sulfone (PES) membranes, dry storage at ambient temperatures for varying periods of time, followed by rehydration. Inside the culture cassettes, the PES membranes were mounted above blotters containing dehydrated growth media. These were mounted on stainless steel bases and sealed with plastic covers that have permeable membrane covered ports for gas exchange. The results showed we were able to demonstrate acceptable normal growth of C.elegans (nematodes), E.coli (bacteria), S.cerevisiae (yeast), Polytrichum (moss) spores and protonemata, C.thalictroides (fern), D.discoideum (amoeba), and H.dujardini (tardigrades). All organisms showed acceptable growth and rehydration in both petri dishes and culture cassettes initially, and after various time lengths of dehydration. At the end of on orbit ISS European Modular Cultivation System experiments the cassettes could be frozen at ultra-low temperatures, refrigerated, or chemically

  13. A validated active contour method driven by parabolic arc model for detection and segmentation of mitochondria.

    Science.gov (United States)

    Tasel, Serdar F; Mumcuoglu, Erkan U; Hassanpour, Reza Z; Perkins, Guy

    2016-06-01

    Recent studies reveal that mitochondria take substantial responsibility in cellular functions that are closely related to aging diseases caused by degeneration of neurons. These studies emphasize that the membrane and crista morphology of a mitochondrion should receive attention in order to investigate the link between mitochondrial function and its physical structure. Electron microscope tomography (EMT) allows analysis of the inner structures of mitochondria by providing highly detailed visual data from large volumes. Computerized segmentation of mitochondria with minimum manual effort is essential to accelerate the study of mitochondrial structure/function relationships. In this work, we improved and extended our previous attempts to detect and segment mitochondria from transmission electron microcopy (TEM) images. A parabolic arc model was utilized to extract membrane structures. Then, curve energy based active contours were employed to obtain roughly outlined candidate mitochondrial regions. Finally, a validation process was applied to obtain the final segmentation data. 3D extension of the algorithm is also presented in this paper. Our method achieved an average F-score performance of 0.84. Average Dice Similarity Coefficient and boundary error were measured as 0.87 and 14nm respectively.

  14. A validated active contour method driven by parabolic arc model for detection and segmentation of mitochondria

    Science.gov (United States)

    Tasel, Serdar F.; Mumcuoglu, Erkan U.; Hassanpour, Reza Z.; Perkins, Guy

    2017-01-01

    Recent studies reveal that mitochondria take substantial responsibility in cellular functions that are closely related to aging diseases caused by degeneration of neurons. These studies emphasize that the membrane and crista morphology of a mitochondrion should receive attention in order to investigate the link between mitochondrial function and its physical structure. Electron microscope tomography (EMT) allows analysis of the inner structures of mitochondria by providing highly detailed visual data from large volumes. Computerized segmentation of mitochondria with minimum manual effort is essential to accelerate the study of mitochondrial structure/function relationships. In this work, we improved and extended our previous attempts to detect and segment mitochondria from transmission electron microcopy (TEM) images. A parabolic arc model was utilized to extract membrane structures. Then, curve energy based active contours were employed to obtain roughly outlined candidate mitochondrial regions. Finally, a validation process was applied to obtain the final segmentation data. 3D extension of the algorithm is also presented in this paper. Our method achieved an average F-score performance of 0.84. Average Dice Similarity Coefficient and boundary error were measured as 0.87 and 14 nm respectively. PMID:26956730

  15. Modeling Central American Volcanic Front Primitive Lavas with the Arc Basalt Simulator (abs 4.0)

    Science.gov (United States)

    Feigenson, M.; Carr, M. J.; Gazel, E.

    2012-12-01

    We have used the Arc Basalt Simulator (ABS), developed by J-I Kimura, to explore the conditions and components of melting beneath the Central American volcanic front. ABS is a comprehensive forward model that incorporates slab dehydration and melting and mantle wedge fluxing and melting using realistic P-T conditions and experimentally determined phase relations and partition coefficients. We have applied ABS version 4.00, which includes melting/dehydration relations in eight distinct subducting layers, to model representative magma types along the Central American volcanic front. These magmas are first projected to primary melt compositions by the addition of olivine until they reach Fo90. Then, using a wide range of input parameters including variations in slab components, extent of peridotite depletion, depth of slab dehydration and wedge fluxing and degree of peridotite melting, successful model fits are generated (based on trace element and isotope matching). The solution space is probed using a Monte Carlo technique to cover the enormous range of parameter values. Nicaragua and Costa Rica represent geochemical and geophysical end members of the volcanic front, differing greatly in volcano volume, slab dip beneath the volcano, isotopic composition and incompatible element enrichment. Using appropriate input compositions for ABS 4.0, we find through millions of simulations that the Cerro Negro primary magma (Nicaragua) requires high degrees of source melting (22-27%) and large amounts of slab-derived water (3-5%). In contrast, the Irazu primary magma (central Costa Rica) is generated from more enriched sources with only a small amount of water (less than 0.5%) and at low degrees of partial melting (less than 5%). Other Central American lavas with intermediate geochemical characteristics are produced from conditions within the Nicaragua-Costa Rica range. By reproducing the lava geochemistry with ABS 4.0, it becomes possible to extract constraints on source input

  16. Is satisfaction a direct predictor of nursing turnover? Modelling the relationship between satisfaction, expressed intention and behaviour in a longitudinal cohort study

    Directory of Open Access Journals (Sweden)

    Griffiths Peter

    2008-10-01

    Full Text Available Abstract Background The theory of planned behaviour states that attitudinal variables (e.g. job satisfaction only have an indirect effect on retention whereas intentions have a direct effect. This study uses secondary data from a longitudinal cohort of newly qualified nurses to test for the direct and indirect effects of job satisfaction (client care, staffing, development, relationships, education, work-life interface, resources, pay and intentions to nurse on working as a nurse during the 3 years after qualification. Methods A national sample (England of newly qualified (1997/98 nurses (n = 3669 were surveyed at 6 months, 18 months and 3 years. ANOVA and MANOVA were used for comparison of mean job satisfaction scores between groups; intentions to nurse (very likely, likely vs. unlikely, very unlikely and unable to say at this stage; working (or not working as a nurse at each time-point. Indirect and direct effects were tested using structural equation and logistic regression models. Results Intentions expressed at 6 months to nurse at 18 months were associated with higher scores on pay and relationships, and intentions at 3 years were associated with higher scores on care, development, relationships, work-life interface, resources, pay respectively. Intentions expressed at 18 months to nurse at 3 years were associated with higher scores on development, relationships, education and work-life interface. Associations with actual nursing were fewer. Those working as a nurse had higher satisfaction scores for development (18 months and relationships (3 years. Regression models found significant associations between the pay and staffing factors and intentions expressed at 6 months to nurse at 18 months, and between pay and intentions to nurse at 3 years. Many of the associations between intentions and working as a nurse were significant. Development was the only job satisfaction factor significantly associated with working as a nurse and just at 18

  17. A model of psychosocial work environment, stress, and satisfaction among dental students in Sweden.

    Science.gov (United States)

    Schéle, Ingrid A; Hedman, Leif R; Hammarström, Anne

    2012-09-01

    Dental students are often described as stressed. The stress has, among other things, been connected to stressors in their psychosocial environment and inconsistent feedback. The hypothesis of this study was that the psychosocial work environment in dental schools leads to stress and affects the satisfaction of dental students and that tolerance for ambiguity shields students from stress. A web-based survey was sent to the entire Swedish dental student population in clinical training (N=805); the response rate was 40 percent. Structural equation modeling used in the analyses contains four main constructs: psychosocial work environment, tolerance for ambiguity, perceived stress, and student satisfaction (χ(2)=267.437, d.f.=174, pstress and satisfaction: it accounted for almost all of the explained variance in perceived stress for women, while about half of the variance for the men was explained by tolerance for ambiguity. This study concluded that about 40 percent of the total perceived stress of these female dental students was related to their psychosocial work environment. Tolerance for ambiguity shielded men but not women from stress. An improved psychosocial work environment in dental schools would decrease the stress of both male and female dental students.

  18. Using a Mixed IRT Model to Assess the Scale Usage in the Measurement of Job Satisfaction.

    Science.gov (United States)

    Kutscher, Tanja; Crayen, Claudia; Eid, Michael

    2016-01-01

    This study investigated the adequacy of a rating scale with a large number of response categories that is often used in panel surveys for assessing diverse aspects of job satisfaction. An inappropriate scale usage is indicative of overstraining respondents and of diminished psychometric scale quality. The mixed Item Response Theory (IRT) approach for polytomous data allows exploring heterogeneous patterns of inappropriate scale usage in form of avoided categories and response styles. In this study, panel data of employees (n = 7036) on five aspects of job satisfaction measured on an 11-point rating scale within the "Household, Income and Labor Dynamics in Australia" (wave 2001) were analyzed. A three-class solution of the restricted mixed generalized partial credit model fit the data best. The results showed that in no class the 11-point scale was appropriately used but that the number of categories used was reduced in all three classes. Respondents of the large class (40%) appropriately differentiate between up to six categories. The two smaller classes (33 and 27%) avoid even more categories and show some kind of extreme response style. Furthermore, classes differ in socio-demographic and job-related factors. In conclusion, a two- to six-point scale without the middle point might be more adequate for assessing job satisfaction.

  19. Optical emission from a small scale model electric arc furnace in 250-600 nm region.

    Science.gov (United States)

    Mäkinen, A; Niskanen, J; Tikkala, H; Aksela, H

    2013-04-01

    Optical emission spectroscopy has been for long proposed for monitoring and studying industrial steel making processes. Whereas the radiative decay of thermal excitations is always taking place in high temperatures needed in steel production, one of the most promising environment for such studies are electric arc furnaces, creating plasma in excited electronic states that relax with intense characteristic emission in the optical regime. Unfortunately, large industrial scale electric arc furnaces also present a challenging environment for optical emission studies and application of the method is not straightforward. To study the usability of optical emission spectroscopy in real electric arc furnaces, we have developed a laboratory scale DC electric arc furnace presented in this paper. With the setup, optical emission spectra of Fe, Cr, Cr2O3, Ni, SiO2, Al2O3, CaO, and MgO were recorded in the wavelength range 250-600 nm and the results were analyzed with the help of reference data. The work demonstrates that using characteristic optical emission, obtaining in situ chemical information from oscillating plasma of electric arc furnaces is indeed possible. In spite of complications, the method could possibly be applied to industrial scale steel making process in order to improve its efficiency.

  20. Electron Model Of A Dogbone RLA With Multi-Pass Arcs

    Energy Technology Data Exchange (ETDEWEB)

    Beard, Kevin B. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States) and MUONS Inc., Batavia, IL (United States); Roblin, Yves R. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Morozov, Vasiliy [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Bogacz, Slawomir Alex [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Krafft, Geoffrey A. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

    2012-09-01

    The design of a dogbone Recirculated Linear Accelerator, RLA, with linear-field multi-pass arcs was earlier developed [1] for accelerating muons in a Neutrino Factory and a Muon Collider. It allows for efficient use of expensive RF while the multi-pass arc design based on linear combined-function magnets exhibits a number of advantages over separate-arc or pulsed-arc designs. Such an RLA may have applications going beyond muon acceleration. This paper describes a possible straightforward test of this concept by scaling a GeV scale muon design for electrons. Scaling muon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.5 MeV electron beam is injected at the middle of a 3 MeV/pass linac with two double-pass return arcs and is accelerated to 18 MeV in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, which arises from scaling the 200 MHz muon RF to the frequency readily available at CEBAF: 1.5 GHz. The footprint of a complete RLA fits in an area of 25 by 7 m. The scheme utilizes only fixed magnetic fields including injection and extraction. The hardware requirements are not very demanding, making it straightforward to implement

  1. Mass Balance Modeling for Electric Arc Furnace and Ladle Furnace System in Steelmaking Facility in Turkey

    Institute of Scientific and Technical Information of China (English)

    (I)smail Ekmek(c)i; Ya(s)ar Yetisken; (U)nal (C)amdali

    2007-01-01

    In the electric arc furnace (EAF) steel production processes, scrap steel is principally used as a raw material instead of iron ore. In the steelmaking process with EAF, scrap is first melted in the furnace and then the desired chemical composition of the steel can be obtained in a special furnace such as ladle furnace (LF). This kind of furnace process is used for the secondary refining of alloy steel. LF furnace offers strong heating fluxes and enables precise temperature control, thereby allowing for the addition of desired amounts of various alloying elements. It also provides outstanding desulfurization at high-temperature treatment by reducing molten steel fluxes and removing deoxidation products. Elemental analysis with mass balance modeling is important to know the precise amount of required alloys for the LF input with respect to scrap composition. In present study, chemical reactions with mass conservation law in EAF and LF were modeled altogether as a whole system and chemical compositions of the final steel alloy output can be obtained precisely according to different scrap compositions, alloying elements ratios, and other input amounts. Besides, it was found that the mass efficiency for iron element in the system is 95.93%. These efficiencies are calculated for all input elements as 8.45% for C, 30.31% for Si, 46.36% for Mn, 30.64% for P, 41.96% for S, and 69.79% for Cr, etc. These efficiencies provide valuable ideas about the amount of the input materials that are vanished or combusted for 100 kg of each of the input materials in the EAF and LF system.

  2. Job satisfaction and its modeling among township health center employees: a quantitative study in poor rural China

    Directory of Open Access Journals (Sweden)

    Lu Zu X

    2010-05-01

    Full Text Available Abstract Background Job satisfaction is important to staff management of township health centers (THCs, as it is associated with organizational performance, quality of care and employee retention. The purpose of this study was to measure job satisfaction level of THC employees in poor rural China and to identify relevant features in order to provide policy advice on human resource development of health service institutions in poor regions. Methods A self-completion questionnaire was used to assess the job satisfaction and relevant features (response rate: 90.5% among 172 employees (i.e., clinic doctors, medico-technical workers and public health workers of 17 THCs in Anhui and Xinjiang provinces of China. The study covered a time period of two months in 2007. Results The mean staff job satisfaction scored 83.3, which was in the category of "somewhat satisfied" on a scale ranging from 0 (extremely dissatisfied to 100 (extremely satisfied by employing Likert's transformation formula. Exploratory factor analysis (EFA revealed eight domains involved in modeling of job satisfaction, among which, the caregivers were more satisfied with job significance (88.2, job competency (87.9 and teamwork (87.7, as compared with work reward (72.9 and working conditions (79.7. Mean job satisfaction in Xinjiang (89.7 was higher than that in Anhui (75.5. Conclusions Employees of THCs have moderate job satisfactions in poor areas, which need to be raised further by improving their working conditions and reward.

  3. Hydrodynamic modeling of magmatic-hydrothermal activity at submarine arc volcanoes, with implications for ore formation

    Science.gov (United States)

    Gruen, Gillian; Weis, Philipp; Driesner, Thomas; Heinrich, Christoph A.; de Ronde, Cornel E. J.

    2014-10-01

    Subduction-related magmas have higher volatile contents than mid-ocean ridge basalts, which affects the dynamics of associated submarine hydrothermal systems. Interaction of saline magmatic fluids with convecting seawater may enhance ore metal deposition near the seafloor, making active submarine arcs a preferred modern analogue for understanding ancient massive sulfide deposits. We have constructed a quantitative hydrological model for sub-seafloor fluid flow based on observations at Brothers volcano, southern Kermadec arc, New Zealand. Numerical simulations of multi-phase hydrosaline fluid flow were performed on a two-dimensional cross-section cutting through the NW Caldera and the Upper Cone sites, two regions of active venting at the Brothers volcanic edifice, with the former hosting sulfide mineralization. Our aim is to explore the flow paths of saline magmatic fluids released from a crystallizing magma body at depth and their interaction with seawater circulating through the crust. The model includes a 3×2 km sized magma chamber emplaced at ∼2.5 km beneath the seafloor connected to the permeable cone via a ∼200 m wide feeder dike. During the simulation, a magmatic fluid was temporarily injected from the top of the cooling magma chamber into the overlying convection system, assuming hydrostatic conditions and a static permeability distribution. The simulations predict a succession of hydrologic regimes in the subsurface of Brothers volcano, which can explain some of the present-day hydrothermal observations. We find that sub-seafloor phase separation, inferred from observed vent fluid salinities, and the temperatures of venting at Brothers volcano can only be achieved by input of a saline magmatic fluid at depth, consistent with chemical and isotopic data. In general, our simulations show that the transport of heat, water, and salt from magmatic and seawater sources is partly decoupled. Expulsion of magmatic heat and volatiles occurs within the first few

  4. An achievement-weighted constraint satisfaction approach to modeling user preferences

    Science.gov (United States)

    Kokawa, Takashi; Ogawa, Hitoshi

    The presented study deals with the so-called soft constraint satisfaction problem (SCSP) and proposes an extension to the standard SCSP formulation to accommodate a wider class of over-constrained situations and allow for a generally higher level of flexibility in the constraint-driven problem-solving. The extended modeling approach called Achievement-Weighted Constraint Satisfaction (AWCS) assumes the definition of constraint parameters ``traditional'' for SCSPs, as well as additional parameters specified to dynamically manipulate constraint weights in the course of solution search. These latter parameters make it possible to ``relax'' over-constrained models and obtain a solution even when there are mutually contradicting rules utilized by an AWCS problem-solver. To explore the proposed modeling framework, a task of finding an optimal route in car navigation, based on user preferences - a popular are of research in SCSP studies - is considered. A case study is presented, in which an optimal route is first modeled with constraints reflecting user preferences. Problem solutions having different optimality levels are then obtained. A software system is developed to automate both the optimal route modeling (via interaction with the user) and the solution search processes. The system is applied in an experiment conducted to validate the theoretical ideas. Experimental results are discussed, and conclusions are drawn.

  5. Using active contour models for feature extraction in camera-based seam tracking of arc welding

    DEFF Research Database (Denmark)

    Liu, Jinchao; Fan, Zhun; Olsen, Søren

    2009-01-01

    In the recent decades much research has been performed in order to allow better control of arc welding processes, but the success has been limited, and the vast majority of the industrial structural welding work is therefore still being made manually. Closed-loop and nearly-closed-loop control...... of the processes requires the extraction of characteristic parameters of the welding groove close to the molten pool, i.e. in an environment dominated by the very intense light emission from the welding arc. The typical industrial solution today is a laser-scanner containing a camera as well as a laser source....... It is highly desirable to extract groove features closer to the arc and thus facilitate for a nearly-closed-loop control situation. On the other hand, for performing seam tracking and nearly-closed-loop control it is not necessary to obtain very detailed information about the molten pool area as long as some...

  6. Two-dimensional modelling of internal arc effects in an enclosed MV cell provided with a protection porous filter

    Energy Technology Data Exchange (ETDEWEB)

    Rochette, D [Laboratoire Arc Electrique et Plasmas Thermiques, CNRS UMR 6069, Universite Blaise Pascal, IUT de Montlucon, Avenue Aristide Briand, BP 2235, 03101 Montlucon Cedex (France); Clain, S [Laboratoire de Mathematiques pour l' Industrie et la Physique, CNRS UMR 5640, Universite Paul Sabatier Toulouse 3, 118 route de Narbonne, 31062 Toulouse Cedex 4 (France); Andre, P [Laboratoire Arc Electrique et Plasmas Thermiques, CNRS UMR 6069, Universite Blaise Pascal, IUT de Montlucon, Avenue Aristide Briand, BP 2235, 03101 Montlucon Cedex (France); Bussiere, W [Laboratoire Arc Electrique et Plasmas Thermiques, CNRS UMR 6069, Universite Blaise Pascal, IUT de Montlucon, Avenue Aristide Briand, BP 2235, 03101 Montlucon Cedex (France); Gentils, F [Schneider Electric-Science and Technology Division-Research Center A2, 38050 Grenoble Cedex 9 (France)

    2007-05-21

    Medium voltage (MV) cells have to respect standards (for example IEC ones (IEC TC 17C 2003 IEC 62271-200 High Voltage Switchgear and Controlgear-Part 200 1st edn)) that define security levels against internal arc faults such as an accidental electrical arc occurring in the apparatus. New protection filters based on porous materials are developed to provide better energy absorption properties and a higher protection level for people. To study the filter behaviour during a major electrical accident, a two-dimensional model is proposed. The main point is the use of a dedicated numerical scheme for a non-conservative hyperbolic problem. We present a numerical simulation of the process during the first 0.2 s when the safety valve bursts and we compare the numerical results with tests carried out in a high power test laboratory on real electrical apparatus.

  7. Comparative study analysing women's childbirth satisfaction and obstetric outcomes across two different models of maternity care.

    Science.gov (United States)

    Conesa Ferrer, Ma Belén; Canteras Jordana, Manuel; Ballesteros Meseguer, Carmen; Carrillo García, César; Martínez Roche, M Emilia

    2016-08-26

    To describe the differences in obstetrical results and women's childbirth satisfaction across 2 different models of maternity care (biomedical model and humanised birth). 2 university hospitals in south-eastern Spain from April to October 2013. A correlational descriptive study. A convenience sample of 406 women participated in the study, 204 of the biomedical model and 202 of the humanised model. The differences in obstetrical results were (biomedical model/humanised model): onset of labour (spontaneous 66/137, augmentation 70/1, p=0.0005), pain relief (epidural 172/132, no pain relief 9/40, p=0.0005), mode of delivery (normal vaginal 140/165, instrumental 48/23, p=0.004), length of labour (0-4 hours 69/93, >4 hours 133/108, p=0.011), condition of perineum (intact perineum or tear 94/178, episiotomy 100/24, p=0.0005). The total questionnaire score (100) gave a mean (M) of 78.33 and SD of 8.46 in the biomedical model of care and an M of 82.01 and SD of 7.97 in the humanised model of care (p=0.0005). In the analysis of the results per items, statistical differences were found in 8 of the 9 subscales. The highest scores were reached in the humanised model of maternity care. The humanised model of maternity care offers better obstetrical outcomes and women's satisfaction scores during the labour, birth and immediate postnatal period than does the biomedical model. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

  8. Comparative study analysing women's childbirth satisfaction and obstetric outcomes across two different models of maternity care

    Science.gov (United States)

    Conesa Ferrer, Ma Belén; Canteras Jordana, Manuel; Ballesteros Meseguer, Carmen; Carrillo García, César; Martínez Roche, M Emilia

    2016-01-01

    Objectives To describe the differences in obstetrical results and women's childbirth satisfaction across 2 different models of maternity care (biomedical model and humanised birth). Setting 2 university hospitals in south-eastern Spain from April to October 2013. Design A correlational descriptive study. Participants A convenience sample of 406 women participated in the study, 204 of the biomedical model and 202 of the humanised model. Results The differences in obstetrical results were (biomedical model/humanised model): onset of labour (spontaneous 66/137, augmentation 70/1, p=0.0005), pain relief (epidural 172/132, no pain relief 9/40, p=0.0005), mode of delivery (normal vaginal 140/165, instrumental 48/23, p=0.004), length of labour (0–4 hours 69/93, >4 hours 133/108, p=0.011), condition of perineum (intact perineum or tear 94/178, episiotomy 100/24, p=0.0005). The total questionnaire score (100) gave a mean (M) of 78.33 and SD of 8.46 in the biomedical model of care and an M of 82.01 and SD of 7.97 in the humanised model of care (p=0.0005). In the analysis of the results per items, statistical differences were found in 8 of the 9 subscales. The highest scores were reached in the humanised model of maternity care. Conclusions The humanised model of maternity care offers better obstetrical outcomes and women's satisfaction scores during the labour, birth and immediate postnatal period than does the biomedical model. PMID:27566632

  9. Enhanced understanding of the relationship between erection and satisfaction in ED treatment: application of a longitudinal mediation model.

    Science.gov (United States)

    Bushmakin, A G; Cappelleri, J C; Symonds, T; Stecher, V J

    2014-01-01

    To apportion the direct effect and the indirect effect (through erections) that sildenafil (vs placebo) has on individual satisfaction and couple satisfaction over time, longitudinal mediation modeling was applied to outcomes on the Sexual Experience Questionnaire. The model included data from weeks 4 and 10 (double-blind phase) and week 16 (open-label phase) of a controlled study. Data from 167 patients with erectile dysfunction (ED) were available for analysis. Estimation of statistical significance was based on bootstrap simulations, which allowed inferences at and between time points. Percentages (and corresponding 95% confidence intervals) for direct and indirect effects of treatment were calculated using the model. For the individual satisfaction and couple satisfaction domains, direct treatment effects were negligible (not statistically significant) whereas indirect treatment effects via the erection domain represented >90% of the treatment effects (statistically significant). Week 4 vs week 10 percentages of direct and indirect effects were not statistically different, indicating that the mediation effects are longitudinally invariant. As there was no placebo arm in the open-label phase, mediation effects at week 16 were not estimable. In conclusion, erection has a crucial role as a mediator in restoring individual satisfaction and couple satisfaction in men with ED treated with sildenafil.

  10. New insights into regional tectonics of the Sunda-Banda Arcs region from integrated magnetic and gravity modelling

    Science.gov (United States)

    Zubaidah, Teti; Korte, Monika; Mandea, Mioara; Hamoudi, Mohamed

    2014-02-01

    The Lombok Island (Indonesia), situated along the Sunda-Banda Arcs transition region, lies between zones characterized by very large intensity magnetic anomalies. These anomalies have been noted as being part of the eight most important ones seen on the 1st edition of the World Digital Magnetic Anomaly Map. Unfortunately, only marine magnetic data of surroundings are available, and no regional high-resolution magnetic surveys of this island had been done. Since 2004, we have carried out several geomagnetic ground surveys in this region. Here, we present modelling results for a new geological and tectonic interpretation of the magnetic anomalies. The new results confirm the general pattern of contiguous negative-positive anomalies, revealing two active Quaternary normal faults and a magmatic arc related to a subduction region. This outcome agrees with earlier results in surrounding areas obtained by satellite, aeromagnetic, and marine platforms, and provides a more detailed picture of strong anomalies on this island. Considering both magnetic anomalies and gravity models, it is possible to suggest an extension of the Flores Thrust zone (reaching the northwest off the Lombok Island). The Flores Thrust zone may be considered as a mature subduction in the back arc region, showing a tendency of progressive subduction during last decades.

  11. Understanding students’ satisfaction and continuance intention of e-learning: Application of expectation–confirmation model

    Directory of Open Access Journals (Sweden)

    Forouzan Rezaeian Tiyar

    2015-12-01

    Full Text Available The evolution of technologies leads to the great significance of e-learning in the domain of education. Recognition of the crucial factors which influence learners’ aims towards continued use of e-learning would guide teachers, learners and e-learning developers to increase e-learning use. To this end, the present study investigates the Expectation-Confirmation Model (ECM factors of Post-Adoption Expectation (PAE which is explored via using language learners’ post-adoption experiences in the use of e-learning systems. Learning process, tutor interaction, peer interaction, and course design are the four factors identified used for extending the perception of language learners’ experiences in e-learning. The survey method was used to empirically validate the suggested model (ECM of the present study. A total sample of 120 Iranian university students participated in the study. In order to investigate the proposed model, structural equation modelling employing Smart PLS 2.0 was run. The findings indicate that learners’ confirmation of using e-learning has a significant effect on the four aforementioned factors. Learning process and course design are the only two factors that have a significant effect on users’ satisfaction and continuance intention. On the other hand, the results showed that tutor interaction and peer interaction do not have a significant effect on predicting learners’ satisfaction and continuance intention of e-learning systems.

  12. Effect of ingratiation on supervisor satisfaction through helping behavior: A moderated mediation model

    Directory of Open Access Journals (Sweden)

    Muhammad Ali Asadullah

    2016-10-01

    Full Text Available Purpose: This research intends to investigate the mediating role of helping behavior in relationship between employee ingratiation and supervisor satisfaction across high and low levels of ingratiation behavior, and answers the questions: how, when and why ingratiation is effective. Design/methodology/approach: Data were collected through questionnaire surveys in hotel industry, and structural equation modelling was applied to analyze these data by using hypothetical-deductive approach. Findings: The results indicate that helping behavior is an important mediator of the relationship between ingratiation and supervisor satisfaction. Moreover, ingratiation is also a strong moderator of the relationship between helping behavior and supervisor satisfaction. This research concludes that employee ingratiation positively predicts helping behaviors, and consequently the supervisor satisfaction. Research limitations/implications: This study is not experimental in nature, but a cross-sectional design has been followed. Future research can focus on an experimental design by incorporating a time element, and the design and analysis should be nested since this study did not use multilevel analysis. Moreover, this study used only two forms of ingratiation for measuring employee ingratiation behavior. We suggest researchers to consider all four dimensions of ingratiation by using some distinct scales. Practical implications: This research explains mechanisms underlying supervisor-subordinate relationship, and contributes to organizational behavior research by answering the question; 'when and how ingratiation could be effective?' The findings of this study have important managerial implications, and provide future lines of research.  Social implications: The findings of this research demonstrate that ingratiation is an important tool for satisfying superiors if employees exhibit helping behaviors towards coworkers and supervisors. Particularly, new employees

  13. Customer satisfaction and business excellence

    DEFF Research Database (Denmark)

    Kristensen, Kai; Martensen, Anne; Grønholdt, Lars

    , customer loyalty and performance, and optimal customer satisfaction is characterized which will help management choose the right quality parameters for improvement. Second, the paper describes empirical evidence that customer satisfaction measures, based on a modelling approach, have impact on economic......The topic for this paper is the link between customer satisfaction and business performance, which makes it possible to use customer satisfaction measures as basis for creating business excellence. First, the paper presents microeconomic models for the relationship between customer satisfaction...

  14. Customer satisfaction and business excellence

    DEFF Research Database (Denmark)

    Kristensen, Kai; Martensen, Anne; Grønholdt, Lars

    The topic for this paper is the link between customer satisfaction and business performance, which makes it possible to use customer satisfaction measures as basis for creating business excellence. First, the paper presents microeconomic models for the relationship between customer satisfaction......, customer loyalty and performance, and optimal customer satisfaction is characterized which will help management choose the right quality parameters for improvement. Second, the paper describes empirical evidence that customer satisfaction measures, based on a modelling approach, have impact on economic...

  15. Faculty Satisfaction in Academic Medicine.

    Science.gov (United States)

    Nyquist, Julie G.; Hitchcock, Maurice A.; Teherani, Arianne

    2000-01-01

    Describes the challenges and elements of satisfaction in academic medicine. Proposes a model of academic faculty satisfaction which postulates that organizational, job-related, and personal factors combine to develop self-knowledge, social knowledge, and satisfaction with outcomes of productivity, retention, and learner-patient satisfaction. (DB)

  16. Examination of the Two Models of Subjective Well-Being and Correlations between Satisfaction with Life, Demographic Variables and Personality Traits

    Directory of Open Access Journals (Sweden)

    Ivana Lučev

    2010-12-01

    Full Text Available The goal of this study was to further the understanding of complex processes that are the base for feelings and satisfaction judgments by examining two models of subjective well-being. 1048 participants rated satisfaction with life and filled out IPIP-50 questionnaire that measures personality traits of the Big five model and demographic data questionnaire. Satisfaction with life in general was statistically significantly positively correlated with satisfaction of relationships with other people, satisfaction with health as well as with specific aspects of these domains. As was expected according to judgment model, correlations were higher for global domains than for specific aspects of satisfaction except for satisfaction with mood. Hypothesis of general positivity model and judgment model were tested in a series of hierarchical regression analyses. General life satisfaction explained variance of both global domains above and beyond satisfaction with corresponding specific domains. Contribution of global life satisfaction was significant even after effect of big five personality traits was controlled. Personality traits of the Big five model were statistically significantly associated with general life satisfaction. Correlation coefficients were -0.41 for Neuroticism, 0.30 for Extraversion, 0.14 for Agreeableness, 0.13 for Conscientiousness and 0.22 for Intellect. Age, education and being in a relationship were positively correlated with general life satisfaction. In this connection younger, better educated persons and those being in relationship were more satisfied with life in general. Women had higher levels of satisfaction for relationship with parents, while men had higher levels of satisfaction with partner, mobility, energy level, immunity and absence of pain.

  17. Transformational leadership in the consumer service workgroup: competing models of job satisfaction, change commitment, and cooperative conflict resolution.

    Science.gov (United States)

    Yang, Yi-Feng

    2014-02-01

    This paper discusses the effects of transformational leadership on cooperative conflict resolution (management) by evaluating several alternative models related to the mediating role of job satisfaction and change commitment. Samples of data from customer service personnel in Taiwan were analyzed. Based on the bootstrap sample technique, an empirical study was carried out to yield the best fitting model. The procedure of hierarchical nested model analysis was used, incorporating the methods of bootstrapping mediation, PRODCLIN2, and structural equation modeling (SEM) comparison. The analysis suggests that leadership that promotes integration (change commitment) and provides inspiration and motivation (job satisfaction), in the proper order, creates the means for cooperative conflict resolution.

  18. Modeling Learner Satisfaction in an Electronic Instrumentation and Measurement Course Using Structural Equation Models

    Science.gov (United States)

    Toral, S. L.; Barrero, F.; Martinez-Torres, M. R.; Gallardo, S.; Duran, M. J.

    2009-01-01

    The prevailing tendency in modern university reforms is towards "how people learn," following a learner-centered approach in which the learner is the main actor of the teaching-learning process. As a consequence, one of the key indicators of the teaching-learning process is the measurement of learner satisfaction within the classroom.…

  19. Modeling Learner Satisfaction in an Electronic Instrumentation and Measurement Course Using Structural Equation Models

    Science.gov (United States)

    Toral, S. L.; Barrero, F.; Martinez-Torres, M. R.; Gallardo, S.; Duran, M. J.

    2009-01-01

    The prevailing tendency in modern university reforms is towards "how people learn," following a learner-centered approach in which the learner is the main actor of the teaching-learning process. As a consequence, one of the key indicators of the teaching-learning process is the measurement of learner satisfaction within the classroom.…

  20. SCALED ELECTRON MODEL OF A DOGBONE MUON RLA WITH MULTI-PASS ARCS

    Energy Technology Data Exchange (ETDEWEB)

    Kevin Beard, Rolland Johnson, Vasiliy Morozov, Yves Roblin, Andrew Hutton, Geoffrey Krafft, Slawomir Bogacz

    2012-07-01

    The design of a dogbone RLA with linear-field multi-pass arcs was earlier developed for accelerating muons in a Neutrino Factory and a Muon Collider. It allows for efficient use of expensive RF while the multi-pass arc design based on linear combined-function magnets exhibits a number of advantages over separate-arc or pulsed-arc designs. Such an RLA may have applications going beyond muon acceleration. This paper describes a possible straightforward test of this concept by scaling a GeV scale muon design for electrons. Scaling muon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.5 MeV electron beam is injected at the middle of a 3 MeV/pass linac with two double-pass return arcs and is accelerated to 18 MeV in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, which arises from scaling the 200 MHz muon RF to a readily available at CEBAF 1.5 GHz. The footprint of a complete RLA fits in an area of 25 by 7 m. The scheme utilizes only fixed magnetic fields including injection and extraction. The hardware requirements are not very demanding, making it straightforward to implement. In this report, we have shown first of all that measuring the energy spectrum of the fast neutrons in the liquid scintillators allows one to distinguish the two chemical forms of plutonium. In addition, combining this information with the Feynman 2-neutron and 3-neutron correlations allows one to extract the {alpha}-ratio without explicitly knowing the multiplication. Given the {alpha}-ratio one can then extract the multiplication as well as the {sup 239}Pu and {sup 240}Pu masses directly from the moment equations.

  1. A new extension of dynamic simplex model for the public transport customer satisfaction

    OpenAIRE

    Cristina Bernini; Alessandro Lubisco

    2013-01-01

    The dynamic analysis of Customer Satisfaction is particularly useful for monitoring either customer satisfaction over time or customer behaviour reaction to company strategies, and therefore for measuring their effectiveness and efficiency. In the paper we address the following questions: does the level of customer satisfaction change over time? If yes, which factors might explain these differences? Does customer expectation influence the overall satisfaction over time? In order to answer to ...

  2. THE IMPACT OF ARCS MOTIVATION MODEL ON MOTIVATION AND SUCCESS LEVEL OF PRIMARY 4TH GRADE STUDENTS IN SOCIAL STUDIES

    OpenAIRE

    Mustafa TAHİROĞLU

    2015-01-01

    The purpose of this study is to detect the impact of a teaching-learning process, structured taking the components of ARCS Motivation Model into consideration, on the motivation and success level of primary grade 4 students in social studies. In scope of the study, grouped pretest-posttest testing model is used. The experimental group consists of 32, and the control group 30 students. In order to collect research data, the “Grade 4 and 5 Social Studies Motivation Scale” and “Social Studies Ac...

  3. Experimental Verification of the Physical Model for Droplet-Particles Cleaning in Pulsed Bias Arc Ion Plating

    Institute of Scientific and Technical Information of China (English)

    Yanhui ZHAO; Guoqiang LIN; Chuang DONG; Lishi WEN

    2005-01-01

    It has been reported that application of pulsed biases in arc ion plating could effectively eliminate droplet particles.The present paper aims at experimental verification of a physical model proposed previously by us which is based on particle charging and repulsion in the pulsed plasma sheath. An orthogonal experiment was designed for this purpose,using the electrical parameters of the pulsed bias for the deposition of TiN films on stainless steel substrates. The effect of these parameters on the amount and the size distribution of the particles were analyzed, and the results provided sufficient evidence for the physical model.

  4. Effect of Clinical Teaching Associate Model on Nursing Students' Clinical Skills and Nurses' Satisfaction.

    Science.gov (United States)

    Rahnavard, Zahra; Eybpoosh, Sana; Alianmoghaddam, Narges

    2013-10-02

    Abstract Background and Objectives: The credit of the practice nurses in developing countries, due to gap between theory and practice in nursing education and health care delivery has been questioned by nursing professionals. Therefore, the aims of this study were to investigate the effectiveness of the application of the CTA model in nursing students' clinical skills and to assess the participants' (faculty members, staff nurses, and nursing students) level of satisfaction with the CTA model and with achieving the educational goals in Iran, as a developing country. Methods and Materials: In this experimental study, random sampling was used to assess 104 nursing students' clinical skills, and assess 6 faculty members and 6 staff nurses. After obtaining informed consent, the level of satisfaction was evaluated by a questionnaire and clinical skills were evaluated by standard checklists. Data were assessed and analyzed with SPSS version 15. Results: The results showed that the mean scores of all clinical skills of the students were significantly higher after intervention (pskills in nursing students in Iran as a developing country. Therefore, application of the method is recommended in clinical nursing education systems of such counties.

  5. 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.

  6. Open Source Software Success Model for Iran: End-User Satisfaction Viewpoint

    Directory of Open Access Journals (Sweden)

    Ali Niknafs

    2012-03-01

    Full Text Available The open source software development is notable option for software companies. Recent years, many advantages of this software type are cause of move to that in Iran. National security and international restrictions problems and also software and services costs and more other problems intensified importance of use of this software. Users and their viewpoints are the critical success factor in the software plans. But there is not an appropriate model for open source software case in Iran. This research tried to develop a measuring open source software success model for Iran. By use of data gathered from open source users and online survey the model was tested. The results showed that components by positive effect on open source success were user satisfaction, open source community services quality, open source quality, copyright and security.

  7. Ordinal regression models to describe tourist satisfaction with Sintra's world heritage

    Science.gov (United States)

    Mouriño, Helena

    2013-10-01

    In Tourism Research, ordinal regression models are becoming a very powerful tool in modelling the relationship between an ordinal response variable and a set of explanatory variables. In August and September 2010, we conducted a pioneering Tourist Survey in Sintra, Portugal. The data were obtained by face-to-face interviews at the entrances of the Palaces and Parks of Sintra. The work developed in this paper focus on two main points: tourists' perception of the entrance fees; overall level of satisfaction with this heritage site. For attaining these goals, ordinal regression models were developed. We concluded that tourist's nationality was the only significant variable to describe the perception of the admission fees. Also, Sintra's image among tourists depends not only on their nationality, but also on previous knowledge about Sintra's World Heritage status.

  8. Establishing a model to assess the effects of school support and self-care behaviors on life satisfaction in adolescents with type 1 diabetes in Taiwan.

    Science.gov (United States)

    Tang, Shan-Mei; Chen, Shu-Wen; Wang, Ruey-Hsia

    2013-12-01

    Life satisfaction is associated with positive development in adolescents. Understanding a path model of life satisfaction can help healthcare providers design interventions to improve positive development in adolescents with type 1 diabetes. The aim of this study was to construct a model that assesses the effects of school support and self-care behaviors on life satisfaction in adolescents with type 1 diabetes in Taiwan. This study used a cross-sectional design. One hundred and thirty-nine adolescents aged 10-18 years and diagnosed with type 1 diabetes were recruited. Participants completed questionnaires that assessed perceived school support, self-care behaviors, and life satisfaction. The hypothesized model was tested using structural equation modeling. School support significantly and directly affected self-care behaviors (β = .46, p = .022) and life satisfaction (β = .39, p = .034), self-care behaviors directly affected life satisfaction (β = .56, p = .048), and school support indirectly affected life satisfaction (β = .26, p = .015) through the mediation of self-care behaviors. The fix indices were as follows: χ2 = 8.141, df = 11, p = .701, goodness of fit index = .984, normed fit index = .949, and root mean square residual = .001. The model explained 66.1% of total life satisfaction variance. School support and self-care behaviors positively influence the life satisfaction of adolescents with type 1 diabetes. Improvements in school support and self-care behaviors are necessary to improve life satisfaction in this vulnerable group.

  9. Measuring patient satisfaction with postpartum teaching methods used by nurses within the interaction model of client health behavior.

    Science.gov (United States)

    Wagner, Debra L; Bear, Mary; Davidson, Nangela S

    2011-01-01

    The purpose of this study was to determine the relationship between new mothers' interaction with nurses using different teaching methods to provide postpartum discharge teaching and their satisfaction with nursing care. Cox's Interaction Model of Client Health Behavior (IMCHB) provided the framework for this study. This study used a quasi-experimental posttest design with two groups to examine patient satisfaction with different teaching methods used by nurses to provide postpartum education. The Modified Client Satisfaction Tool measured satisfaction with discharge teaching. Data were analyzed with descriptive statistics, chi-square, Kendall's tau, and Mann-Whitney U tests. The data showed high satisfaction scores for new mothers receiving both methods of discharge teaching, indicating that new mothers who received the traditional method of discharge instruction provided by nurses were just as satisfied as those who received the demonstration/return demonstration method of discharge instructions provided by nurses. Providing individualized care, based on the expressed needs of the patient, was demonstrated in this study to result in high satisfaction with nursing care using both methods of providing postpartum discharge teaching.

  10. How happy is your web browsing? A model to quantify satisfaction of an Internet user searching for desired information

    Science.gov (United States)

    Banerji, Anirban; Magarkar, Aniket

    2012-09-01

    We feel happy when web browsing operations provide us with necessary information; otherwise, we feel bitter. How to measure this happiness (or bitterness)? How does the profile of happiness grow and decay during the course of web browsing? We propose a probabilistic framework that models the evolution of user satisfaction, on top of his/her continuous frustration at not finding the required information. It is found that the cumulative satisfaction profile of a web-searching individual can be modeled effectively as the sum of a random number of random terms, where each term is a mutually independent random variable, originating from ‘memoryless’ Poisson flow. Evolution of satisfaction over the entire time interval of a user’s browsing was modeled using auto-correlation analysis. A utilitarian marker, a magnitude of greater than unity of which describes happy web-searching operations, and an empirical limit that connects user’s satisfaction with his frustration level-are proposed too. The presence of pertinent information in the very first page of a website and magnitude of the decay parameter of user satisfaction (frustration, irritation etc.) are found to be two key aspects that dominate the web user’s psychology. The proposed model employed different combinations of decay parameter, searching time and number of helpful websites. The obtained results are found to match the results from three real-life case studies.

  11. Study on the Development of Quality Measurements Models for Steering Business Services in Relation to Customer Satisfaction

    Directory of Open Access Journals (Sweden)

    Katrin Marquardt

    2017-02-01

    Full Text Available The growing competition in the market, higher customer demands and globalisation forces the business service providers to improve their services much faster. Nowadays, it is not enough to provide good quality it is more important to delight the customers and to deliver more than they expect. Likewise, renowned research companies predicted that customer satisfaction will become the competitive differentiator within the next years. Thus, the main reasons of the present study are at first, establishing a common understanding on the term “quality” and presenting the relationship between customer satisfaction and service quality. Secondly, the study summarizes the identified factors, which mostly influence the customer satisfaction, as well as the common methods used to measure service quality in relation to these factors. Thirdly, the authors introduce and explain the newly developed six step model for establishing an effective measurement method for service quality and the proposed three level service quality model with the related measurements and outcomes. Both models will assist business service providers to protect and improve their service quality and with that their customer satisfaction. The methodology used for this research is a systematic literature review focused on subjects of quality, customer satisfaction and best-practice metrics for service quality. In addition, surveys and studies from well-known research companies were evaluated. The outcome of the study is always focused on the business service area.

  12. Using the Job Demands-Resources model to investigate risk perception, safety climate and job satisfaction in safety critical organizations.

    Science.gov (United States)

    Nielsen, Morten Birkeland; Mearns, Kathryn; Matthiesen, Stig Berge; Eid, Jarle

    2011-10-01

    Using the Job Demands-Resources model (JD-R) as a theoretical framework, this study investigated the relationship between risk perception as a job demand and psychological safety climate as a job resource with regard to job satisfaction in safety critical organizations. In line with the JD-R model, it was hypothesized that high levels of risk perception is related to low job satisfaction and that a positive perception of safety climate is related to high job satisfaction. In addition, it was hypothesized that safety climate moderates the relationship between risk perception and job satisfaction. Using a sample of Norwegian offshore workers (N = 986), all three hypotheses were supported. In summary, workers who perceived high levels of risk reported lower levels of job satisfaction, whereas this effect diminished when workers perceived their safety climate as positive. Follow-up analyses revealed that this interaction was dependent on the type of risks in question. The results of this study supports the JD-R model, and provides further evidence for relationships between safety-related concepts and work-related outcomes indicating that organizations should not only develop and implement sound safety procedures to reduce the effects of risks and hazards on workers, but can also enhance other areas of organizational life through a focus on safety.

  13. Direct and Indirect Effects of Education on Job Satisfaction: A Structural Equation Model for the Spanish Case

    Science.gov (United States)

    Fabra, M. Eugenia; Camison, Cesar

    2009-01-01

    Empirical literature has traditionally analyzed the effect of education on job satisfaction with single-equation models that ignore interrelationships between theoretical explanatory variables. Their results are somewhat inconclusive. We propose estimating a structural equation model to obtain both the direct effects and the set of indirect…

  14. Modeling of high pressure arc-discharge with a fully-implicit Navier-Stokes stabilized finite element flow solver

    Science.gov (United States)

    Sahai, A.; Mansour, N. N.; Lopez, B.; Panesi, M.

    2017-05-01

    This work addresses the modeling of high pressure electric discharge in an arc-heated wind tunnel. The combined numerical solution of Poisson’s equation, radiative transfer equations, and the set of Favre-averaged thermochemical nonequilibrium Navier-Stokes equations allows for the determination of the electric, radiation, and flow fields, accounting for their mutual interaction. Semi-classical statistical thermodynamics is used to determine the plasma thermodynamic properties, while transport properties are obtained from kinetic principles with the Chapman-Enskog method. A multi-temperature formulation is used to account for thermal non-equilibrium. Finally, the turbulence closure of the flow equations is obtained by means of the Spalart-Allmaras model, which requires the solution of an additional scalar transport equation. A Streamline upwind Petrov-Galerkin stabilized finite element formulation is employed to solve the Navier-Stokes equation. The electric field equation is solved using the standard Galerkin formulation. A stable formulation for the radiative transfer equations is obtained using the least-squares finite element method. The developed simulation framework has been applied to investigate turbulent plasma flows in the 20 MW Aerodynamic Heating Facility at NASA Ames Research Center. The current model is able to predict the process of energy addition and re-distribution due to Joule heating and thermal radiation, resulting in a hot central core surrounded by colder flow. The use of an unsteady three-dimensional treatment also allows the asymmetry due to a dynamic electric arc attachment point in the cathode chamber to be captured accurately. The current work paves the way for detailed estimation of operating characteristics for arc-heated wind tunnels which are critical in testing thermal protection systems.

  15. Model construction from orthographic views as Pseudo Boolean constraint satisfaction problem

    Energy Technology Data Exchange (ETDEWEB)

    Itoh, Kiyoshi; Suzuki, Shigemich [Sophia Univ., Tokyo (Japan)

    1996-12-31

    A surface model representation of a solid can be constructed in straightforward fashion from a set of three orthographic views. The surface model may include ghost vertexes, ghost edges and ghost faces. The authors` project, called Sophia-Alsovig, treats the problem for obtaining valid combination of surfaces and edges as Pseudo Boolean constraint satisfaction problem (CSP). It can remove such ghosts. As CSP, Sophia-Alsovig adopts a set of units consisting of edges and surfaces, a set of Boolean labels, and a set of constraints with the formulation of a collection of topological/geometrical rules for edges and surfaces by Pseudo Boolean equations. Sophia-Alsovig obtains solutions by Pseudo Boolean Nonlinear Programming.

  16. Natural Aggregation Approach based Home Energy Manage System with User Satisfaction Modelling

    Science.gov (United States)

    Luo, F. J.; Ranzi, G.; Dong, Z. Y.; Murata, J.

    2017-07-01

    With the prevalence of advanced sensing and two-way communication technologies, Home Energy Management System (HEMS) has attracted lots of attentions in recent years. This paper proposes a HEMS that optimally schedules the controllable Residential Energy Resources (RERs) in a Time-of-Use (TOU) pricing and high solar power penetrated environment. The HEMS aims to minimize the overall operational cost of the home, and the user’s satisfactions and requirements on the operation of different household appliances are modelled and considered in the HEMS. Further, a new biological self-aggregation intelligence based optimization technique previously proposed by the authors, i.e., Natural Aggregation Algorithm (NAA), is applied to solve the proposed HEMS optimization model. Simulations are conducted to validate the proposed method.

  17. Multiphysics Modeling and Simulations of Mil A46100 Armor-Grade Martensitic Steel Gas Metal Arc Welding Process

    Science.gov (United States)

    2013-05-23

    Technology Laboratory, Watertown, MA, 1992 2. J.G. Holmes and B.J. Resnick, Flexible Robot Arc Welding System, Soc. Manuf. Eng., 1979, MS (79) 3. U.S...Process, Proceedings of the IEEE International Conference on Robotics and Automation, Detroit, Vol. 4, p 3059–3064 19. Z. Bingul and G.E. Cook, A Real-Time...Prediction Model of Electrode Extension for GMAW, IEEE/ASME Trans. Mechatron ., 2006, 11, p 47–54 20. T.P. Quinn, R.B. Madigan, and T.A. Siewert, An

  18. The the presentation of the model and primary index for identification and measuring the effective factors on customer satisfaction and loyalty in the automobile industry

    Directory of Open Access Journals (Sweden)

    Nastaran Dehghani Samani

    2014-03-01

    Full Text Available Awareness of the customer satisfaction always been a scientific and practical major issue in the marketing because of it’s the cause of loyalty. This study aimed to identifying factors that influence the customer satisfaction in the automobile industry and eventually provided a model. Therefore, after reading the relevant literature, the variables were determined and 11 hypothesis assigned. For data gathering used a questionnaire which completed by the staff of the Central Bank. Data analyzed with the technique of structural equation modeling and used the LISREL and SPSS software. The results showed that the index and model for measuring customer satisfaction in the automotive industry, is appropriate. Factors affecting customer satisfaction can be expressed this way: quality, expectations, perceived value, image But service had no effect on satisfaction. In addition, satisfaction, was a factor that had the most influence on customer loyalty.

  19. The subsurface three-dimensional modeling of volcano arc of Flores island based on gravity data analysis

    Science.gov (United States)

    Titi, Yopiter Lukas Alexander; Minarto, Eko

    2017-01-01

    The interpretation and three-dimensional modeling of the subsurface structure of the volcano arc of the Flores island based on the gravity data analysis have been done. This research is aimed for modeling subsurface structure utilized a secondary data of complete Bouguer anomaly gravity data obtained from Bureau Gravimetric International (BGI) using Grablox and Bloxer software. The modeling construction was performed by inversion technique applying the method of Singular Value Decomposition (SVD) and Occam inversion. The result indicates that Subsurface structure of the volcano area of the Flores island consists of sandstone, breccia and andesite have density value ranging from 2,42 g/cm3 to 2,62 g/cm3 and basaltic and lava have density values ranging from 2,65 g/cm3 to 3,24 g/cm3. The most dominating rocks in the study area are basaltic rocks have 2.73 g/cm3 point of average density. The existence of magma chamber in the volcanic arc of Flores island was estimated at a depth of 6 km.

  20. Two-dimensional time-dependent modelling of fume formation in a pulsed gas metal arc welding process

    Science.gov (United States)

    Boselli, M.; Colombo, V.; Ghedini, E.; Gherardi, M.; Sanibondi, P.

    2013-06-01

    Fume formation in a pulsed gas metal arc welding (GMAW) process is investigated by coupling a time-dependent axi-symmetric two-dimensional model, which takes into account both droplet detachment and production of metal vapour, with a model for fume formation and transport based on the method of moments for the solution of the aerosol general dynamic equation. We report simulative results of a pulsed process (peak current = 350 A, background current 30 A, period = 9 ms) for a 1 mm diameter iron wire, with Ar shielding gas. Results showed that metal vapour production occurs mainly at the wire tip, whereas fume formation is concentrated in the fringes of the arc in the spatial region close to the workpiece, where metal vapours are transported by convection. The proposed modelling approach allows time-dependent tracking of fumes also in plasma processes where temperature-time variations occur faster than nanoparticle transport from the nucleation region to the surrounding atmosphere, as is the case for most pulsed GMAW processes.

  1. NUMERICAL MODELING OF HEAT TRANSFER AND FLUID FLOW IN KEYHOLE PLASMA ARC WELDING OF DISSIMILAR STEEL JOINTS

    Directory of Open Access Journals (Sweden)

    M. A. Daha

    2012-02-01

    Full Text Available The evolution of temperature profiles and weld pool geometry during dissimilar welding between 2205 duplex stainless steel and A36 low carbon steel using keyhole plasma arc welding has been simulated using a three dimensional numerical heat transfer and fluid flow model. An adaptive heat source is proposed as a heat source model for performing a non-linear transient thermal analysis, based on the configuration feature of keyhole plasma arc welds. Temperature profiles and solidified weld pool geometry are presented for three different welding heat input. The reversed bugle shape parameters (width of fusion zone at both top and bottom surfaces of the weld pool geometry features for a dissimilar 2205–A36 weld joint are summarized to successfully explain the observations. The model was also applied to keyhole plasma welding of 6.8 mm thick similar 2205 duplex stainless steel joint for validation. The simulation results were compared with independently obtained experimental data and good agreements have been obtained.

  2. 75 FR 54627 - ICLUS v1.3 User's Manual: ArcGIS Tools and Datasets for Modeling U.S. Housing Density Growth

    Science.gov (United States)

    2010-09-08

    ... ] growth and economic development, which are used by climate change modelers to develop projections of... AGENCY ICLUS v1.3 User's Manual: ArcGIS Tools and Datasets for Modeling U.S. Housing Density Growth... Modeling U.S. Housing Density Growth'' (EPA/600/R-09/ 143F). The tool and its documentation were prepared...

  3. A Comprehensive Model Of Customer Satisfaction In Hospitality And Tourism: Strategic Implications For Management

    OpenAIRE

    Robert Christie Mill

    2011-01-01

    Providing and maintaining customer satisfaction is one of the most important challenges facing business today. Although this is a relatively new concept, research into this area has grown since the early 1980s. One ongoing debate in consumer satisfaction circles is the extent to which it is a cognitive process or an emotional state. The two theories that best explain customer satisfaction are disconfirmation paradigm and expectancy-value concept. Disconfirmation theory postulates that cus...

  4. The Factors Influencing Satisfaction with Public City Transport: A Structural Equation Modelling Approach

    OpenAIRE

    Pawlasova Pavlina

    2015-01-01

    Satisfaction is one of the key factors which influences customer loyalty. We assume that the satisfied customer will be willing to use the ssame service provider again. The overall passengers´ satisfaction with public city transport may be affected by the overall service quality. Frequency, punctuality, cleanliness in the vehicle, proximity, speed, fare, accessibility and safety of transport, information and other factors can influence passengers´ satisfaction. The aim of this pap...

  5. A Three Step B2B Sales Model Based on Satisfaction Judgments

    DEFF Research Database (Denmark)

    Grünbaum, Niels Nolsøe

    2015-01-01

    . The insights produces can be applied for selling companies to craft close collaborative customer relationships in a systematic ad efficient way. The process of building customer relationships will be guided through actions that yields higher satisfaction judgments leading to loyal customers and finally...... comprising of 1. Identification of the satisfaction dimensions the buying center members apply in the buying process. 2. Identification of the fluctuation in importance of the satisfaction dimensions and finally 3. Identification of the degree of expectations‘ adjacent to the identified satisfaction...

  6. Fingerprint of a submerged-arc Furnace. Optimising energy consumption through data mining, dynamic modelling and computational fluid dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Scheepers, E.

    2008-06-26

    This study imparts a scientific perception of a phosphorous-producing submerged arc furnace never seen before; a proverbial fingerprint that can improve problem identification, disturbance diagnostics, process prediction, dynamic modelling and model predictive control of this type of furnace. It successfully incorporates accurate, multi-field thermodynamic-, kinetic- and industrial data with computational flow dynamic calculations; thus further unifying the sciences of kinetics and equilibrium thermodynamics. The true power of this study is the extensive and methodical validation that ensures industrially endorsed results. To facilitate all this the author spent six uninterrupted months at an industrial plant (Thermphos International), twice walked inside a cold submerged-arc furnace, gathered and analysed more than thirty-four mineralogical samples, managed an extensive and insightful sampling campaign on the slag streams, performed feed material porosity tests and had thirteen additional temperature probes installed inside the furnace lining. The author also scrutinised over years of industrial data, inspected many industrial drawing and partook in countless valuable conversations with industrial and technical experts to guarantee, not only a valuable scientific contribution, but one that is deep-rooted in authentic engineering principles.

  7. ASSESMENT OF THE DESTINATION IN TERMS OF TOURISM WITH IMPORTANCE-SATISFACTION MODEL: AN IMPLEMENTATION IN EDREMIT

    Directory of Open Access Journals (Sweden)

    Mehmet Sedat İPAR

    2013-06-01

    Full Text Available The major objective of the research is to determine the crucial elements that the local tourists attribute importance to in their decision processes regarding their holidays such as facilities, location and resources of the destination and the tourism services that are provided, while asserting how much they are satisfied in terms of these elements regarding the Edremit destination. As the initial step of the research, the literature was browsed in order to understand the elements that the tourists take into consideration while making a decision on their holiday and their satisfaction levels. The survey obtained in the related literature was used to gauge the importance and satisfaction levels of the tourists. Then the data acquired were analyzed with descriptive statistics and were interpreted by making a distribution on the model developed by Yang (2003a. Both similarities and differences were detected in some elements of the survey, according to the local tourists’ importance and satisfaction. Also some significant insufficiencies in some elements were defined regarding Edremit. If the destination managers and stakeholders take the results of the importance-satisfaction analysis, then the performance of the destination in terms of tourist satisfaction would increase. It is obvious that these findings shall be tested and updated with other researches in the coming period.

  8. Evaluation of the Effective Factors on Customers' Satisfaction Using INDSAT Model; Case Study: Household Appliances' Customers of Mobarakeh Steel Company

    Directory of Open Access Journals (Sweden)

    Ali Kazemi

    2012-12-01

    Full Text Available Customers and consumers are always looking for suppliers who offer better products or services to their clients. Lots of documents show that in today's competitive world, exploring and meeting customers' needs and and requirements before other competitors, is the essential condition for companies to be successful. vices provided by organizations is the assessment of customer satisfaction. this study deals with identification and investigation of factors affecting industrial customer's satisfaction at Mobarake Steel Company of Esfahan. Statistical population included 125 company of the Household Appliances' Customers of Mobarakeh Steel Company. Field methods and questionnaire were used to gather essential information. In this study, 161 questionnaires were randomly distributed to Customers. Eventually 117 questionnaires were returned. SPSS and Amos were used to analyze data descriptively, assess the credibility of the model and test hypotheses. Results indicated that all satisfaction factors (product- sales people- product-related information- order handling- technical services- interaction with supplier's internal staff- complaint handling as the aspects of have positive effects on overall customer satisfaction. Also, all of these factors are not of the same preference to the customers; sales staff and product satisfactions the scored highest and complaint handling the lowest.

  9. A Novel Contextual Information Recommendation Model and Its Application in e-Commerce Customer Satisfaction Management

    Directory of Open Access Journals (Sweden)

    Feipeng Guo

    2015-01-01

    Full Text Available In the current supply chain environment, distributed cognition theory tells us that various types of context information in which a recommendation is provided are important for e-commerce customer satisfaction management. However, traditional recommendation model does not consider the distributed and differentiated impact of different contexts on user needs, and it also lacks adaptive capacity of contextual recommendation service. Thus, a contextual information recommendation model based on distributed cognition theory is proposed. Firstly, the model analyzes the differential impact of various sensitive contexts and specific examples on user interest and designs a user interest extraction algorithm based on distributed cognition theory. Then, the sensitive contexts extracted from user are introduced into the process of collaborative filtering recommendation. The model calculates similarity among user interests. Finally, a novel collaborative filtering algorithm integrating with context and user similarity is designed. The experimental results in e-commerce and benchmark dataset show that this model has a good ability to extract user interest and has higher recommendation accuracy compared with other methods.

  10. Impact of the health services utilization and improvement model (HUIM) on self efficacy and satisfaction among a head start population.

    Science.gov (United States)

    Tataw, David B; Bazargan-Hejazi, Shahrzad

    2010-01-01

    The aim of this paper is to evaluate and report the impact of the Health Services Utilization Improvement Model (HUIM) on utilization and satisfaction with care, as well as knowledge regarding prevention, detection, and treatment of asthma, diabetes, tuberculosis, and child injury among low income health services consumers. HUIM outcomes data shows that the coupling of parental education and ecological factors (service linkage and provider orientation) impacts the health services utilization experience of low income consumers evidenced by improved self-efficacy (knowledge and voice), and satisfaction with care from a child's regular provider. Participation in HUIM activities also improved the low income consumer's knowledge of disease identification, self-care and prevention.

  11. Predicting student satisfaction with courses based on log data from a virtual learning environment – a neural network and classification tree model

    OpenAIRE

    Đurđević Babić, Ivana

    2015-01-01

    Student satisfaction with courses in academic institutions is an important issue and is recognized as a form of support in ensuring effective and quality education, as well as enhancing student course experience. This paper investigates whether there is a connection between student satisfaction with courses and log data on student courses in a virtual learning environment. Furthermore, it explores whether a successful classification model for predicting student satisfaction with course can be...

  12. Thermodynamic modelling of the formation of zinc-manganese ferrite spinel in electric arc furnace dust.

    Science.gov (United States)

    Pickles, C A

    2010-07-15

    Electric arc furnace dust is generated when automobile scrap, containing galvanized steel, is remelted in an electric arc furnace. This dust is considered as a hazardous waste in most countries. Zinc is a major component of the dust and can be of significant commercial value. Typically, the majority of the zinc exists as zinc oxide (ZnO) and as a zinc-manganese ferrite spinel ((Zn(x)Mn(y)Fe(1-x-y))Fe(2)O(4)). The recovery of the zinc from the dust in metal recycling and recovery processes, particularly in the hydrometallurgical extraction processes, is often hindered by the presence of the mixed ferrite spinel. However, there is a paucity of information available in the literature on the formation of this spinel. Therefore, in the present research, the equilibrium module of HSC Chemistry 6.1 was utilized to investigate the thermodynamics of the formation of the spinel and the effect of variables on the amount and the composition of the mixed ferrite spinel. It is proposed that the mixed ferrite spinel forms due to the reaction of iron-manganese particulates with both gaseous oxygen and zinc, at the high temperatures in the freeboard of the furnace above the steel melt. Based on the thermodynamic predictions, methods are proposed for minimizing the formation of the mixed ferrite spinel.

  13. Application of a radiant heat transfer model to complex industrial reactive flows: combustion chambers, electric arcs; Application d`un modele de transfert radiatif a des ecoulements reactifs industriels complexes: chambres de combustion, arcs electriques

    Energy Technology Data Exchange (ETDEWEB)

    Mechitoua, N.; Dalsecco, S.; Delalondre, C.; Simonin, O. [Electricite de France (EDF), 78 - Chatou (France). Lab. National d`Hydraulique

    1996-12-31

    The direction of studies and researches (DER) of Electricite de France (EdF) has been involved for several years in a research program on turbulent reactive flows. The objectives of this program concern: the reduction of pollutant emissions from existing fossil-fueled power plants, the study of new production means (fluidized beds), and the promotion of electric power applications in the industry. An important part of this program is devoted to the development and validation of 3-D softwares and to the modeling of physical phenomena. This paper presents some industrial applications (furnaces, boilers, electric arcs) for which radiant heat transfers play an important role and the radiation models used. (J.S.) 8 refs.

  14. Gender-Specific Models of Work-Bound Korean Adolescents' Social Supports and Career Adaptability on Subsequent Job Satisfaction

    Science.gov (United States)

    Han, Hyojung; Rojewski, Jay W.

    2015-01-01

    A Korean national database, the High School Graduates Occupational Mobility Survey, was used to examine the influence of perceived social supports (family and school) and career adaptability on the subsequent job satisfaction of work-bound adolescents 4 months after their transition from high school to work. Structural equation modeling analysis…

  15. Gender-Specific Models of Work-Bound Korean Adolescents' Social Supports and Career Adaptability on Subsequent Job Satisfaction

    Science.gov (United States)

    Han, Hyojung; Rojewski, Jay W.

    2015-01-01

    A Korean national database, the High School Graduates Occupational Mobility Survey, was used to examine the influence of perceived social supports (family and school) and career adaptability on the subsequent job satisfaction of work-bound adolescents 4 months after their transition from high school to work. Structural equation modeling analysis…

  16. Elderly Mothers of Adult Children with Intellectual Disability: An Exploration of a Stress Process Model for Caregiving Satisfaction

    Science.gov (United States)

    Kim, Go-en; Chung, Soondool

    2016-01-01

    Background: This study examines the utility of Pearlin's caregiving stress model for understanding the caregiving satisfaction of elderly mothers of adult children with intellectual disability. Methods: Mothers living in Seoul, Kyonggi, and Incheon who were 55 years of age or older and providing care for adult children with intellectual disability…

  17. An Online Process Model of Second-Order Cultivation Effects: How Television Cultivates Materialism and Its Consequences for Life Satisfaction

    Science.gov (United States)

    Shrum, L. J.; Lee, Jaehoon; Burroughs, James E.; Rindfleisch, Aric

    2011-01-01

    Two studies investigated the interrelations among television viewing, materialism, and life satisfaction, and their underlying processes. Study 1 tested an online process model for television's cultivation of materialism by manipulating level of materialistic content. Viewing level influenced materialism, but only among participants who reported…

  18. Pre-Trip Expectations and Post-Trip Satisfaction with Marine Tour Interpretation in Hawaii: Applying the Norm Activation Model

    Science.gov (United States)

    Littlejohn, Kerrie; Needham, Mark D.; Szuster, Brian W.; Jordan, Evan J.

    2016-01-01

    This article examines environmental education by focusing on recreationist expectations for interpretation on marine tours, satisfaction with this interpretation and whether expectations were met, and how these perceptions correlate with components of the norm activation model. Recreationists surveyed before and after tours to Molokini, Hawaii (n…

  19. Satisfaction of Needs and Determining of Life Goals: A Model of Subjective Well-Being for Adolescents in High School

    Science.gov (United States)

    Eryilmaz, Ali

    2011-01-01

    The aim of this study is to develop and test a subjective well-being model for adolescents in high school. A total of 326 adolescents in high school (176 female and 150 male) participated in this study. The data was collected by using the general needs satisfaction questionnaire, which is for the adolescents' subjective well-being, and determining…

  20. Modeling of an electric arc transferred on a melted glass bath; Modelisation d`un arc electrique transfere sur un bain de verre

    Energy Technology Data Exchange (ETDEWEB)

    Mehlman, G.; Langlois, A. [SGN, 78 - Saint Quentin en Yvelines (France)

    1997-12-31

    The aim of this study is to propose a methodology allowing the simulation of melting processes involving electromagnetic phenomena. This methodology is based on the use of scientific calculation tools currently used elsewhere. The case considered in this study has been defined in collaboration with Electricite de France (EdF) and concerns more particularly an electric arc vitrification process for wastes. Basic data have been determined in order to obtain results representative of the tests performed by EdF with pilot installations. (J.S.)

  1. Dominant particles and reactions in a two-temperature chemical kinetic model of a decaying SF6 arc

    Science.gov (United States)

    Wang, Xiaohua; Gao, Qingqing; Fu, Yuwei; Yang, Aijun; Rong, Mingzhe; Wu, Yi; Niu, Chunping; Murphy, Anthony B.

    2016-03-01

    reactions by a factor of about 2, while providing results that agree closely with the full model. Thus, the physicochemical processes of SF6 arc can be characterized by relatively few species and reactions in each temperature range. It is noted that the simplified models can also be applied to a wide range of pressures, 1-16 atm, conditions which cover most circuit breaker applications. The simplified species and reactions will allow the computing time of multi-dimensional models, taking into account departures from both thermal and chemical equilibrium, to be decreased dramatically while capturing the main physicochemical processes in SF6 arcs.

  2. [Application of job demands-resources model in research on relationships between job satisfaction, job resources, individual resources and job demands].

    Science.gov (United States)

    Potocka, Adrianna; Waszkowska, Małgorzata

    2013-01-01

    The aim of this study was to explore the relationships between job demands, job resourses, personal resourses and job satisfaction and to assess the usefulness of the Job Demands-Resources (JD-R) model in the explanation of these phenomena. The research was based on a sample of 500 social workers. The "Psychosocial Factors" and "Job satisfaction" questionnaires were used to test the hypothesis. The results showed that job satisfaction increased with increasing job accessibility and personal resources (r = 0.44; r = 0.31; p job resources and job demands [F(1.474) = 4.004; F(1.474) = 4.166; p job satisfaction. Moreover, interactions between job demands and job resources [F(3,474) = 2.748; p job demands and personal resources [F(3.474) = 3.021; p job satisfaction. The post hoc tests showed that 1) in low job demands, but high job resources employees declared higher job satisfaction, than those who perceived them as medium (p = 0.0001) or low (p = 0.0157); 2) when the level of job demands was perceived as medium, employees with high personal resources declared significantly higher job satisfaction than those with low personal resources (p = 0.0001). The JD-R model can be used to investigate job satisfaction. Taking into account fundamental factors of this model, in organizational management there are possibilities of shaping job satisfaction among employees.

  3. Invariants and Other Structural Properties of Biochemical Models as a Constraint Satisfaction Problem

    Directory of Open Access Journals (Sweden)

    Soliman Sylvain

    2012-05-01

    Full Text Available Abstract Background We present a way to compute the minimal semi-positive invariants of a Petri net representing a biological reaction system, as resolution of a Constraint Satisfaction Problem. The use of Petri nets to manipulate Systems Biology models and make available a variety of tools is quite old, and recently analyses based on invariant computation for biological models have become more and more frequent, for instance in the context of module decomposition. Results In our case, this analysis brings both qualitative and quantitative information on the models, in the form of conservation laws, consistency checking, etc. thanks to finite domain constraint programming. It is noticeable that some of the most recent optimizations of standard invariant computation techniques in Petri nets correspond to well-known techniques in constraint solving, like symmetry-breaking. Moreover, we show that the simple and natural encoding proposed is not only efficient but also flexible enough to encompass sub/sur-invariants, siphons/traps, etc., i.e., other Petri net structural properties that lead to supplementary insight on the dynamics of the biochemical system under study. Conclusions A simple implementation based on GNU-Prolog's finite domain solver, and including symmetry detection and breaking, was incorporated into the BIOCHAM modelling environment and in the independent tool Nicotine. Some illustrative examples and benchmarks are provided.

  4. Effect of empowerment on professional practice environments, work satisfaction, and patient care quality: further testing the Nursing Worklife Model.

    Science.gov (United States)

    Spence Laschinger, Heather K

    2008-01-01

    The purpose of this study was to test Leiter and Laschinger's Nursing Worklife Model linking structural empowerment to Lake's 5-factor professional practice work environment model and work quality outcomes. A predictive, nonexperimental design was used to test the model in a random sample of 234 staff nurses. The analysis revealed that professional practice environment characteristics mediated the relationship between structurally empowering work conditions and both job satisfaction and nurse-assessed patient care quality.

  5. An Electronic Service Quality Reference Model for Designing E-Commerce Websites Which Maximizes Customer Satisfaction

    Science.gov (United States)

    Shaheen, Amer N.

    2011-01-01

    This research investigated Electronic Service Quality (E-SQ) features that contribute to customer satisfaction in an online environment. The aim was to develop an approach which improves E-CRM processes and enhances online customer satisfaction. The research design adopted mixed methods involving qualitative and quantitative methods to…

  6. Motivation, Satisfaction, and Perceived Freedom: A Tri-Dimensional Model of Leisure among Young Offenders

    Science.gov (United States)

    Munchua, Michelle M.; Lesage, Deanna M.; Reddon, John R.; Badham, Tania D.

    2003-01-01

    A sample of 84 male young offenders, admitted for inpatient treatment in a psychiatric hospital, was used to examine the relationship between leisure motivation, leisure satisfaction, and perceived freedom in leisure using the Leisure Motivation Scale (LMS), the Leisure Satisfaction Scale (LSS), and the Perceived Freedom in Leisure Scale-Short…

  7. What Drives Emergency Department Patient Satisfaction? An Empirical Test using Structural Equation Modeling

    DEFF Research Database (Denmark)

    Sørup, Christian Michel; Jacobsen, Peter

    2013-01-01

    Patient satisfaction determinants in emergency departments (EDs) have for decades been heavily investigated. Despite great focus, a lack of consensus about which parameters are deemed most important remains. This study proposes an integrated framework for ED patient satisfaction, testing four key...

  8. Two-way causation in life satisfaction research : Structural equation models with granger causation

    NARCIS (Netherlands)

    Headey, Bruce; Muffels, R.J.A.

    2014-01-01

    Two-way causation issues are the bete noire of life satisfaction research. As acknowledged in several landmark reviews, many variables routinely reported as causes or determinants of life satisfaction could equally well be consequences, or perhaps both causes and consequences (Diener, 1984; Diener,

  9. Modeling Key Drivers of E-Learning Satisfaction among Student Teachers

    Science.gov (United States)

    Teo, Timothy; Wong, Su Luan

    2013-01-01

    This study explored the key drivers of student teachers' e-learning satisfaction. Three hundred and eighty-seven participants completed a survey questionnaire measuring their self-reported responses to six constructs (tutor quality, perceived usefulness, perceived ease of use, course delivery, facilitating conditions, and course satisfaction).…

  10. An Electronic Service Quality Reference Model for Designing E-Commerce Websites Which Maximizes Customer Satisfaction

    Science.gov (United States)

    Shaheen, Amer N.

    2011-01-01

    This research investigated Electronic Service Quality (E-SQ) features that contribute to customer satisfaction in an online environment. The aim was to develop an approach which improves E-CRM processes and enhances online customer satisfaction. The research design adopted mixed methods involving qualitative and quantitative methods to…

  11. Seizure-like activity in a juvenile Angelman syndrome mouse model is attenuated by reducing Arc expression.

    Science.gov (United States)

    Mandel-Brehm, Caleigh; Salogiannis, John; Dhamne, Sameer C; Rotenberg, Alexander; Greenberg, Michael E

    2015-04-21

    Angelman syndrome (AS) is a neurodevelopmental disorder arising from loss-of-function mutations in the maternally inherited copy of the UBE3A gene, and is characterized by an absence of speech, excessive laughter, cognitive delay, motor deficits, and seizures. Despite the fact that the symptoms of AS occur in early childhood, behavioral characterization of AS mouse models has focused primarily on adult phenotypes. In this report we describe juvenile behaviors in AS mice that are strain-independent and clinically relevant. We find that young AS mice, compared with their wild-type littermates, produce an increased number of ultrasonic vocalizations. In addition, young AS mice have defects in motor coordination, as well as abnormal brain activity that results in an enhanced seizure-like response to an audiogenic challenge. The enhanced seizure-like activity, but not the increased ultrasonic vocalizations or motor deficits, is rescued in juvenile AS mice by genetically reducing the expression level of the activity-regulated cytoskeleton-associated protein, Arc. These findings suggest that therapeutic interventions that reduce the level of Arc expression have the potential to reverse the seizures associated with AS. In addition, the identification of aberrant behaviors in young AS mice may provide clues regarding the neural circuit defects that occur in AS and ultimately allow new approaches for treating this disorder.

  12. A Study on the Factors Affecting Student’s Satisfaction in E-learning: A Model Proposition

    Directory of Open Access Journals (Sweden)

    Orhan Torkul,

    Full Text Available In this study, relative importance of factors affecting student satisfaction in the context of e-learning are examined. Following a detailed literature review on student satisfaction on e-learning, a model was proposed explaining student satisfaction in the context of e-learning. The factors included in the model are grouped under five headings, formed by fifteen sub-factors. These sub factors are, student-instructor interaction, student’s level of computer usage, student’s attitude towards computer use, instructor’s interest in e-learning, quality of course materials, traceability of student’s development, ease of use of the e-learning system, accessibility to system, quality of interaction with the system, quality, flexibility, currency of the materials, university support services, student tracking and course management. A questionnaire was carried out on 562 students attending to e-learning programs at various levels in order to test the proposed research model. Exploratory factor analysis suggested that the ten factors solution was a better solution than fifteen factors solution. Furthermore, regression analysis findings indicated that only six of the ten factors tend to influence student satisfaction in e-learning.

  13. ALICE: ARC integration

    CERN Document Server

    Anderlik, C; Kleist, J; Peters, A; Saiz, P

    2008-01-01

    AliEn or Alice Environment is the Grid middleware developed and used within the ALICE collaboration for storing and processing data in a distributed manner. ARC (Advanced Resource Connector) is the Grid middleware deployed across the Nordic countries and gluing together the resources within the Nordic Data Grid Facility (NDGF). In this paper we will present our approach to integrate AliEn and ARC, in the sense that ALICE data management and job processing can be carried out on the NDGF infrastructure, using the client tools available in AliEn. The inter-operation has two aspects, one is the data management part and the second the job management aspect. The first aspect was solved by using dCache across NDGF to handle data. Therefore, we will concentrate on the second part. Solving it, was somewhat cumbersome, mainly due to the different computing models employed by AliEn and ARC. AliEN uses an Agent based pull model while ARC handles jobs through the more 'traditional' push model. The solution comes as a modu...

  14. Resistivity due to weak double layers - A model for auroral arc thickness

    Science.gov (United States)

    Prakash, Manju; Lysak, Robert L.

    1992-01-01

    We have calculated the resistivity due to a sequence of fluctuating weak double layers aligned parallel to the ambient magnetic field line. The average response of an electron drifting through a 1D randomly oriented array of WDLs is studied using a test particle approach. The average is taken over the randomly fluctuating values of the electric field associated with the double layers. Based on our calculations, we estimate that a 350 eV electron energy the thickness of the visual auroral arc is about 2.5 km and that of the auroral fine structure as about 250 m when mapped down to the ionosphere. The significance of our calculations is discussed in the context of magnetosphere-ionosphere coupling.

  15. Simulation of Weld Depth in A-TIG Welding with Unified Arc-electrode model

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Calculations have been made for weld depths occurring for TIG welding activated by a flux over the surface of the weld pool. In this case, the flux introduces an electrically insulating layer over the outer regions of the weld-pool surface. There is then an increase in the current density at the surface of the centre of the weld-pool with a consequent increase in the J×B forces, which drive a strong convective flow of the molten metal downwards, tending to make a deep weld. For a flux which produces an insulating layer for all but a central region of radius 2 mm, the calculated weld-depth is 7 mm, and an arc spot is predicted at the centre of the weld-pool surface. As yet we have not resolved the reason for significant differences that exist between our measurements of weld depth and the theoretical predictions.

  16. [Study on ecological suitability of Gardenia jasminoides based on ArcGIS and Maxent model].

    Science.gov (United States)

    Miao, Qi; Yuan, Yuan-Jian; Luo, Guang-Ming; Wei, Chun-Hua; Rao, Ya-Qi; Gong, Yu-Hong; Zhang, Lan; Shao, Jian; Dong, Yan-Kai

    2016-09-01

    The application of ArcGIS and Maxent modelto analyze the ecological suitability of Gardenia jasminoides.Taking 85 batches of Gardenia as the basis of analysis, the selection of ecological factors for the growth of Gardenia. The results showed that the average precipitation in April, the average precipitation in November and the average precipitation in August were the most important factors affecting the growth of Gardenia. The relative concentration of Gardenia suitable growth region,north to the south of Shaanxi province, south of Henan, central Anhui, south to the north of Hainan province, west to central Sichuan province, east of Zhejiang coastal area, northeast of Taiwan. Copyright© by the Chinese Pharmaceutical Association.

  17. Fore-arc structure, plate coupling and isostasy in the Central Andes: Insight from gravity data modelling

    Science.gov (United States)

    Rutledge, Sophia; Mahatsente, Rezene

    2017-02-01

    The central segment of the Peru-Chile subduction zone has not seen a major earthquake of similar scale to the megathrust Iquique event in 1877 (Magnitude ∼8.8). The plate interface between the subducting and overriding plates in the central segment of the subduction zone is highly coupled and is accumulating elastic energy. Here, we assessed the locking mechanism and isostatic state of the Central Andes based on gravity models of the crust and upper mantle structure. The density models are based on satellite gravity data and are constrained by velocity models and earthquake hypocenters. The gravity models indicate a high density batholithic structure in the fore-arc, overlying the subducting Nazca plate. This high density crustal structure is pressing downward into the slab and locking the plate interface. Thus, plate coupling in the Central Andes may result from pressure exerted by high density fore-arc structures and buoyancy force on the subducting Nazca plate. The increased compressive stress closer to the trench, due to the increased contact between the subducting and overriding plates, may increase the intraplate coupling in the Central Andes. To assess the isostatic state of the Central Andes, we determined the residual topography of the region (difference between observed and isostatic topography). There is a residual topography of ∼800 m in the western part of the Central Andes that cannot be explained by the observed crustal thicknesses. The residual topography may be attributed to mantle wedge flow and subduction of the Nazca plate. Thus, part of the observed topography in the western part of the Central Andes may be dynamically supported by mantle wedge flow below the overriding plate.

  18. Another Explanation for Neptune's Ring Arcs

    Science.gov (United States)

    Namouni, F.; Porco, C.

    2001-11-01

    Recent HST and Earth-based observations (Dumas et al 1999, Nature 400, 733; Sicardy et al 1999, Nature 400, 731) indicate that Neptune's ring arcs are not located at the corotation resonance with Galatea thought to be responsible for the azimuthal confinement of the arc system (Porco, 1991 Science 253, 995). Although small (5x 10-3od-1), the new observed mean motion offset puts the arcs near the resonance separatrix where the particles' semimajor axes would experience chaotic motion leading to the azimuthal spreading of the arcs within months, thereby calling into question their very existence. We have found a new resonant structure, dependent on the arcs having a small fraction of the mass of Galatea, in which Galatea's 43:42 eccentric corotation resonance, located (in the massless case) ~ 3 km inside the arcs' orbit, is made coincident with the arcs' semimajor axis. The arcs are primarily confined by this resonance, which is stronger ( e Galatea) than the inclined corotation resonance ( I2 Galatea) invoked in the Porco model. Moreover, the coupling of all the resonances in the arcs' neighborhood (eccentric corotation, inclined corotation and Lindblad resonances) modifies the interaction potential, creating smaller structures at the arcs' location. Consequently, this new confinement mechanism can simultaneously explain the arcs' confinement, the general spacing of the arcs, the Fraternité arc length of ~ 10o, and smaller-scale features seen in the arc system. Finally, the possibility of non-massless arcs supports an earlier suggestion by Porco et al (1991, in Neptune and Triton, the University of Arizona Series) that the rapid expected radial migration of the arc system, due to Galatea's secular torques, can be slowed down if the arcs have substantial mass.

  19. Patient satisfaction

    Directory of Open Access Journals (Sweden)

    Bhanu Prakash

    2010-01-01

    Full Text Available Patient satisfaction is an important and commonly used indicator for measuring the quality in health care. Patient satisfaction affects clinical outcomes, patient retention, and medical malpractice claims. It affects the timely, efficient, and patient-centered delivery of quality health care. Patient satisfaction is thus a proxy but a very effective indicator to measure the success of doctors and hospitals. This article discusses as to how to ensure patient satisfaction in dermatological practice.

  20. Job satisfaction

    OpenAIRE

    Podroužková, Lucie

    2013-01-01

    Bachelor thesis deals with job satisfaction. It is often given to a context with the attitude to work which is very much connected to job satisfaction. Thesis summarises all the pieces of information about job satisfacion, factors that affect it negatively and positively, interconnection of work satisfaction and work motivation, work behaviour and performance of workers, relationship of a man and work and at last general job satisfaction and its individual aspects. In the thesis I shortly pay...

  1. Magnetic resonance Q mapping reveals a decrease in microvessel density in the arcAβ mouse model of cerebral amyloidosis

    Directory of Open Access Journals (Sweden)

    Giovanna eIelacqua

    2016-01-01

    Full Text Available Alterations in density and morphology of the cerebral microvasculature have been reported to occur in Alzheimer`s disease patients and animal models of the disease. In this study we compared magnetic resonance imaging (MRI techniques for their utility to detect age-dependent changes of the cerebral vasculature in the arcAβ mouse model of cerebral amyloidosis. Dynamic susceptibility contrast (DSC-MRI was performed by tracking the passage of a superparamagnetic iron oxide nanoparticle in the brain with dynamic gradient echo echo planar imaging. From this measurements relative cerebral blood volume (rCBV(DSC and relative cerebral blood flow (rCBF were estimated. For the same animal maps of the relaxation shift index Q were computed from high resolution gradient echo and spin echo data that were acquired before and after superparamagnetic iron oxide nanoparticle injection. Q values were used to derive estimates of microvessel density. The change in the relaxation rates ΔR2* obtained from pre- and post-contrast gradient echo data was used for the alternative determination of rCBV (rCBV(ΔR2*. Linear mixed effects modeling found no significant association between rCBV(DSC, rCBV(ΔR2*, rCBF and Q with genotype in 13-month old mice (compared to age-matched non-transgenic littermates for any of the evaluated brain regions. In 24-month old mice there was a significant association for rCBV(DSC with genotype in the cerebral cortex, and for rCBV(ΔR2* in the cerebral cortex and cerebellum. For rCBF there was a significant association in the cerebellum but not in other brain regions. Q values in the olfactory bulb, cerebral cortex, striatum, hippocampus, and cerebellum in 24-month old mice were significantly associated with genotype. In those regions Q values were reduced between 11-26 % in arcAβ mice compared to age-matched non-transgenic littermates. Vessel staining with CD31 immunohistochemistry confirmed a reduction of microvessel density in the old

  2. Magnetic Resonance Q Mapping Reveals a Decrease in Microvessel Density in the arcAβ Mouse Model of Cerebral Amyloidosis.

    Science.gov (United States)

    Ielacqua, Giovanna D; Schlegel, Felix; Füchtemeier, Martina; Xandry, Jael; Rudin, Markus; Klohs, Jan

    2015-01-01

    Alterations in density and morphology of the cerebral microvasculature have been reported to occur in Alzheimer's disease patients and animal models of the disease. In this study we compared magnetic resonance imaging (MRI) techniques for their utility to detect age-dependent changes of the cerebral vasculature in the arcAβ mouse model of cerebral amyloidosis. Dynamic susceptibility contrast (DSC)-MRI was performed by tracking the passage of a superparamagnetic iron oxide nanoparticle in the brain with dynamic gradient echo planar imaging (EPI). From this measurements relative cerebral blood volume [rCBV(DSC)] and relative cerebral blood flow (rCBF) were estimated. For the same animal maps of the relaxation shift index Q were computed from high resolution gradient echo and spin echo data that were acquired before and after superparamagnetic iron oxide (SPIO) nanoparticle injection. Q-values were used to derive estimates of microvessel density. The change in the relaxation rates [Formula: see text] obtained from pre- and post-contrast gradient echo data was used for the alternative determination of rCBV [rCBV([Formula: see text])]. Linear mixed effects modeling found no significant association between rCBV(DSC), rCBV([Formula: see text]), rCBF, and Q with genotype in 13-month old mice [compared to age-matched non-transgenic littermates (NTLs)] for any of the evaluated brain regions. In 24-month old mice there was a significant association for rCBV(DSC) with genotype in the cerebral cortex, and for rCBV([Formula: see text]) in the cerebral cortex and cerebellum. For rCBF there was a significant association in the cerebellum but not in other brain regions. Q-values in the olfactory bulb, cerebral cortex, striatum, hippocampus, and cerebellum in 24-month old mice were significantly associated with genotype. In those regions Q-values were reduced between 11 and 26% in arcAβ mice compared to age-matched NTLs. Vessel staining with CD31 immunohistochemistry confirmed a

  3. A theoretical model to predict customer satisfaction in relation to service quality in selected university libraries in Sri Lanka

    Directory of Open Access Journals (Sweden)

    Chaminda Jayasundara

    2009-01-01

    Full Text Available University library administrators in Sri Lanka have begun to search for alternative ways to satisfy their clientele on the basis of service quality. This article aims at providing a theoretical model to facilitate the identification of service quality attributes and domains that may be used to predict customer satisfaction from a service quality perspective. The effectiveness of existing service quality models such as LibQUAL, SERVQUAL and SERVPREF have been questioned. In that regard, this study developed a theoretical model for academic libraries in Sri Lanka based on the disconfirmation and performance-only paradigms. These perspectives were considered by researchers to be the core mechanism to develop service quality/customer satisfaction models. The attributes and domain identification of service quality was carried out with a stratified sample of 263 participants selected from postgraduate and undergraduate students and academic staff members from the faculties of Arts in four universities in Sri Lanka. The study established that responsiveness, supportiveness, building environment, collection and access, furniture and facilities, technology, Web services and service delivery were quality domains which can be used to predict customer satisfaction. The theoretical model is unique in its domain structure compared to the existing models. The model needs to be statistically tested to make it valid and parsimonious.

  4. Contribution to the 3D time-dependent modeling of the arc dynamic behavior in a DC plasma spray torch; Contribution a la modelisation instationnaire et tridimensionnelle du comportement dynamique de l'arc dans une torche de projection plasma

    Energy Technology Data Exchange (ETDEWEB)

    Baudry, C

    2003-11-15

    This work is devoted to the tri-dimensional time-dependent modeling of the arc behavior in a plasma spray torch. It has been carried out in the fame of a collaboration with the Thermal Spray Laboratory of CEA-DAM, Le Ripault and the laboratory of Fluid Mechanics and Heat Transfers of EDF. After a summary of the operation modes of a DC plasma torch and the effect of anode erosion on the torch working, the structure of an electric arc is depicted as well as the main models of non-transferred electric arcs proposed in the literature. This review allows the determination of the main assumption and boundary conditions for a 'realistic' model of the electric arc. Then, the equations, assumptions and boundary conditions of the model we have developed are presented and, the CFD code ESTET 3.4 used to solve the model equations. The model is based on a specific value of the local electric field to predict the breakdown of the arc while its re-striking is favored by a hot gas column at the spot where the highest value of the electric field is calculated. This model gives a realistic prediction of the time-dependent arc behavior according to the plasma-forming gas nature and of the temperature and velocity of the gas flow at the nozzle exit. However, it overestimates the torch voltage and dimensions of the anode arc root attachment spot. (author)

  5. Surveying the Impact Quality of the Bank's electronic Services on Financial Performance (with the Emphasis on the Customer Satisfaction Model

    Directory of Open Access Journals (Sweden)

    Ali Panjomi Mohmoodi

    2014-06-01

    Full Text Available Survival of any organization in today's competitive environment, is based on clients. Every organization and its customers' current and future needs are identified and satisfied by providing to meet those needs, and it continues to be applied in order to increase their satisfaction. Many organizations utmost sense of audience satisfaction and value creation institute in their strategic plans, mission statements and policy organizations are planning accordingly. The aim of this study was to investigate the impact of e-banking service quality, customer satisfaction and financial performance of banks. This investigation is inspired by the idea of Long-Linked Technology of James Thompson, in an environment of uncertainty factors (the research model. This study was to investigate the effect of customer perceived e-service quality on bank financial performance and to test the mediating role of customer satisfaction on customer perception of service quality of financial performance of e-banking.The results of the field study analyzing the effects of e-service quality and customer satisfaction on financial performance of public and private banks have been gathered. The outcome of the analysis showed that the quality of the electronic components of the ATM quality of service, phone banking, internet banking quality, has a positive impact on customer satisfaction.The results showed that the effect of customer satisfaction due to the quality of e-banking services has a mediating role on the overall financial performance. Key Words: e-banking, customer satisfaction, performance, management. Normal 0 14 false false false IT X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabella normale"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso

  6. Magnification Bias in Gravitational Arc Statistics

    Energy Technology Data Exchange (ETDEWEB)

    Caminha, G. B. [Rio de Janeiro, CBPF; Estrada, J. [Fermilab; Makler, M. [Rio de Janeiro, CBPF

    2013-08-29

    The statistics of gravitational arcs in galaxy clusters is a powerful probe of cluster structure and may provide complementary cosmological constraints. Despite recent progresses, discrepancies still remain among modelling and observations of arc abundance, specially regarding the redshift distribution of strong lensing clusters. Besides, fast "semi-analytic" methods still have to incorporate the success obtained with simulations. In this paper we discuss the contribution of the magnification in gravitational arc statistics. Although lensing conserves surface brightness, the magnification increases the signal-to-noise ratio of the arcs, enhancing their detectability. We present an approach to include this and other observational effects in semi-analytic calculations for arc statistics. The cross section for arc formation ({\\sigma}) is computed through a semi-analytic method based on the ratio of the eigenvalues of the magnification tensor. Using this approach we obtained the scaling of {\\sigma} with respect to the magnification, and other parameters, allowing for a fast computation of the cross section. We apply this method to evaluate the expected number of arcs per cluster using an elliptical Navarro--Frenk--White matter distribution. Our results show that the magnification has a strong effect on the arc abundance, enhancing the fraction of arcs, moving the peak of the arc fraction to higher redshifts, and softening its decrease at high redshifts. We argue that the effect of magnification should be included in arc statistics modelling and that it could help to reconcile arcs statistics predictions with the observational data.

  7. The Effect of Job Demand-Control-Social Support Model on Nurses' Job Satisfaction in Specialized Teaching Hospitals, Ethiopia

    OpenAIRE

    Negussie, Nebiat; Kaur, Geetinder

    2016-01-01

    Background The job demand-control-social support model has been widely studied in western countries but has not been theoretically addressed on health workers of sub-Saharan African countries. Therefore, this study investigates the relationship between Job Demand-Control-Support Model and job satisfaction in specialized teaching hospitals in Ethiopia. Method A cross-sectional survey was conducted from September 2014 to May 2015 in three public specialized teaching hospitals in Ethiopia. Among...

  8. Modelling discrete choice variables in assessment of teaching staff work satisfaction.

    Science.gov (United States)

    Mieilă, Mihai; Popescu, Constanţa; Tudorache, Ana-Maria; Toplicianu, Valerică

    2015-01-01

    Levels of self-reported job satisfaction and motivation were measured by survey in a sample of 286 teachers. Using the discrete choice framework, the paper tries to assess the relevance of the considered indicators (demographic, social, motivational) in overall teaching work satisfaction. The findings provide evidence that job satisfaction is correlated significantly with level of university degree held by the teacher, type of secondary school where the teacher is enrolled, revenues, and salary-tasks adequacy. This is important for the Romanian economy, since the education system is expected to provide future human resources with enhanced skills and abilities.

  9. Predicting student satisfaction with courses based on log data from a virtual learning environment – a neural network and classification tree model

    Directory of Open Access Journals (Sweden)

    Ivana Đurđević Babić

    2015-03-01

    Full Text Available Student satisfaction with courses in academic institutions is an important issue and is recognized as a form of support in ensuring effective and quality education, as well as enhancing student course experience. This paper investigates whether there is a connection between student satisfaction with courses and log data on student courses in a virtual learning environment. Furthermore, it explores whether a successful classification model for predicting student satisfaction with course can be developed based on course log data and compares the results obtained from implemented methods. The research was conducted at the Faculty of Education in Osijek and included analysis of log data and course satisfaction on a sample of third and fourth year students. Multilayer Perceptron (MLP with different activation functions and Radial Basis Function (RBF neural networks as well as classification tree models were developed, trained and tested in order to classify students into one of two categories of course satisfaction. Type I and type II errors, and input variable importance were used for model comparison and classification accuracy. The results indicate that a successful classification model using tested methods can be created. The MLP model provides the highest average classification accuracy and the lowest preference in misclassification of students with a low level of course satisfaction, although a t-test for the difference in proportions showed that the difference in performance between the compared models is not statistically significant. Student involvement in forum discussions is recognized as a valuable predictor of student satisfaction with courses in all observed models.

  10. Calculation of water-bearing primary basalt and estimation of source mantle conditions beneath arcs: PRIMACALC2 model for WINDOWS

    Science.gov (United States)

    Kimura, Jun-Ichi; Ariskin, Alexey A.

    2014-04-01

    present a new method for estimating the composition of water-bearing primary arc basalt and its source mantle conditions. The PRIMACALC2 model uses a thermodynamic fractional crystallization model COMAGMAT3.72 and runs with an Excel macro to examine the mantle equilibrium and trace element calculations of a primary basalt. COMAGMAT3.72 calculates magma fractionation in 0-10 kb at various compositions, pressure, oxygen fugacity, and water content, but is only applicable for forward calculations. PRIMACALC2 first calculates the provisional composition of a primary basalt from an observed magma. The basalt composition is then calculated by COMAGMAT3.72 for crystallization. Differences in elemental concentrations between observed and the closest-match calculated magmas are then adjusted in the primary basalt. Further iteration continues until the calculated magma composition converges with the observed magma, resulting in the primary basalt composition. Once the fitting is satisfied, back calculations of trace elements are made using stepwise addition of fractionated minerals. Mantle equilibrium of the primary basalt is tested using the Fo-NiO relationship of olivine in equilibrium with the primary basalt, and thus with the source mantle. Source mantle pressure, temperature, and degree of melting are estimated using petrogenetic grids based on experimental data obtained in anhydrous systems. Mantle melting temperature in a hydrous system is computed by adjusting T with a parameterization for a water-bearing system. PRIMACALC2 can be used either in dry or water-bearing arc magmas and is also applicable to mid-ocean ridge basalts and nonalkalic ocean island basalts.

  11. Assessing Actual Visit Behavior through Antecedents of Tourists Satisfaction among International Tourists in Jordan: A Structural Equation Modeling (SEM Approach

    Directory of Open Access Journals (Sweden)

    Ayed Moh’d Al Muala

    2011-06-01

    Full Text Available Jordan tourism industry is facing fluctuating tourist visit provoked by dissatisfaction, high visit risk, low hotel service, or negative Jordan image. This study aims to examine the relationships between the antecedents of tourist satisfaction and actual visit behavior in tourism of Jordan, and the mediating effect of tourist satisfaction (SAT in the relationship between Jordan image (JOM, service climate (SER and actual visit behavior (ACT. A total of 850 international tourists completed a survey that were conducted at southern sites in Jordan. Using structural equation modeling (SEM technique, confirmatory Factor Analysis (CFA was performed to examine the reliability and validity of the measurement, and the structural equation modeling techniques (Amos 6.0 were used to evaluate the casual model. Results of the study demonstrate the strong predictive power and explain of international tourists’ behavior in Jordan. The findings highlighted that the relationship between Jordan image and service climate are significant and positive on actual visit behavior.

  12. Physical work environment: testing an expanded model of job satisfaction in a sample of registered nurses.

    Science.gov (United States)

    Djukic, Maja; Kovner, Christine; Budin, Wendy C; Norman, Robert

    2010-01-01

    The impact of personal, organizational, and economic factors on nurses' job satisfaction have been studied extensively, but few studies exist in which the effects of physical work environment--including perceptions of architectural, interior design, and ambient features on job satisfaction-are examined. The purpose of this study was to examine the effect of perceived physical work environment on job satisfaction, adjusting for multiple personal, organizational, and economic determinants of job satisfaction. A cross-sectional, predictive design and a Web-based survey instrument were used to collect data from staff registered nurses in a large metropolitan hospital. The survey included 34 questions about multiple job satisfaction determinants, including 18 Likert-type measures with established good validity (comparative fit index = .97, Tucker-Lewis index = .98, root mean square error of approximation = .06) and reliability (r ≥ .70). A response rate of 48.5% resulted in a sample of 362, with 80% power to detect a medium effect of perceived physical environment on job satisfaction. On average, nurses had negative perceptions of physical work environment (M = 2.9, SD = 2.2). Although physical environment was related positively to job satisfaction (r =.256, p = .01) in bivariate analysis, in ordered probit regression, no effect of physical work environment on job satisfaction was found. In future studies, this relationship should be examined in larger and more representative samples of nurses. Qualitative methods should be used to explore how negatively perceived physical work environment impacts nurses. Rebuilding of U.S. hospitals, with a planned investment of $200 billion without considering how physical environment contributes to nurse work outcomes, threatens to exacerbate organizational nurse turnover.

  13. Satisfaction of cybernautes in virtual communities: An integrated model of experiential value

    OpenAIRE

    Bouattour, Dorra; Debos, Franck; Abdellatif, Tarek

    2014-01-01

    International audience; Although virtual worlds and in particular virtual communities attract more users and contributing members, few studies have focused on what meets the members of these online communities. Studies on Satisfaction was addressed only to the environments of the Internet and neglect satisfaction in virtual communities (eg, Szymanski and Hise 2000; Reibstein 2002; Wolfinbarger and Gilly, 2002; Zeithaml , Parasuraman and Malhotra, 2002). In this work, we have defined and teste...

  14. Modeling and Simulation of Radiative Compressible Flows in Aerodynamic Heating Arc-Jet Facility

    Science.gov (United States)

    Bensassi, Khalil; Laguna, Alejandro A.; Lani, Andrea; Mansour, Nagi N.

    2016-01-01

    Numerical simulations of an arc heated flow inside NASA's 20 [MW] Aerodynamics heating facility (AHF) are performed in order to investigate the three-dimensional swirling flow and the current distribution inside the wind tunnel. The plasma is considered in Local Thermodynamics Equilibrium(LTE) and is composed of Air-Argon gas mixture. The governing equations are the Navier-Stokes equations that include source terms corresponding to Joule heating and radiative cooling. The former is obtained by solving an electric potential equation, while the latter is calculated using an innovative massively parallel ray-tracing algorithm. The fully coupled system is closed by the thermodynamics relations and transport properties which are obtained from Chapman-Enskog method. A novel strategy was developed in order to enable the flow solver and the radiation calculation to be preformed independently and simultaneously using a different number of processors. Drastic reduction in the computational cost was achieved using this strategy. Details on the numerical methods used for space discretization, time integration and ray-tracing algorithm will be presented. The effect of the radiative cooling on the dynamics of the flow will be investigated. The complete set of equations were implemented within the COOLFluiD Framework. Fig. 1 shows the geometry of the Anode and part of the constrictor of the Aerodynamics heating facility (AHF). Fig. 2 shows the velocity field distribution along (x-y) plane and the streamline in (z-y) plane.

  15. A three-model comparison of the relationship between quality, satisfaction and loyalty: an empirical study of the Chinese healthcare system.

    Science.gov (United States)

    Lei, Ping; Jolibert, Alain

    2012-11-30

    Previous research has addressed the relationship between customer satisfaction, perceived quality and customer loyalty intentions in consumer markets. In this study, we test and compare three theoretical models of the quality-satisfaction-loyalty relationship in the Chinese healthcare system. This research focuses on hospital patients as participants in the process of healthcare procurement. Empirical data were obtained from six Chinese public hospitals in Shanghai. A total of 630 questionnaires were collected in two studies. Study 1 tested the research instruments, and Study 2 tested the three models. Confirmatory factor analysis was used to assess the scales' construct validity by testing convergent and discriminant validity. A structural equation model (SEM) specified the distinctions between each construct. A comparison of the three theoretical models was conducted via AMOS analysis. The results of the SEM demonstrate that quality and satisfaction are distinct concepts and that the first model (satisfaction mediates quality and loyalty) is the most appropriate one in the context of the Chinese healthcare environment. In this study, we test and compare three theoretical models of the quality-satisfaction-loyalty relationship in the Chinese healthcare system. Findings show that perceived quality improvement does not lead directly to customer loyalty. The strategy of using quality improvement to maintain patient loyalty depends on the level of patient satisfaction. This implies that the measurement of patient experiences should include topics of importance for patients' satisfaction with health care services.

  16. Mathematical modeling of motion of interacting particles on the basis of the distribution functions in the plasma arc synthesis of ONS

    Directory of Open Access Journals (Sweden)

    G. V. Abramov

    2012-01-01

    Full Text Available The model of the motion of particles in a plasma arc discharge with binary collisions in the synthesis of carbon nanostructures such as fullerenes and nanotubes Rena. The solution of the system of dimensionless equations of the Vlasov-Poisson equations for the determination of the distribution functions of particles in the plasma.

  17. Construction of basin 3D model base on ArcScene and SketchUp%基于ArcScene和SketchUp的流域三维模型建立

    Institute of Scientific and Technical Information of China (English)

    陆赛; 黄信望

    2013-01-01

    Basin three-dimensional model is an important part of the visualization, watershed intuitive three-dimensional model of the real show basin watershed digitized scene. In this paper, in order to build three-dimensional model of the Lijiang River watershed, for example, to explore on ArcScene and Google SketchUp software to build three-dimensional model of the basin.%流域三维可视化是“数字流域”中的一个重要组成部分,流域三维可视化作为一种新的管理方法和技术手段在流域管理中越来越体现其重要性。本文以构建漓江流域三维可视化场景为例,提出了一种采用ArcScene和Google SketchUp软件,快速有效地构建三维流域的方法。

  18. Palaeomagnetic constraints on the geodynamic evolution of the Gibraltar Arc

    NARCIS (Netherlands)

    Krijgsman, W.; Garces, M.

    2004-01-01

    Subduction zone roll-back was recently put forward as a convincing model to explain the geometry and evolution of the Gibraltar Arc. For other subduction-related arc systems of the Mediterranean, such as the Calabrian Arc and the Hellenic Arc, palaeomagnetic rotation data from Neogene extensional ba

  19. Gas Metal Arc Welding Process Modeling and Prediction of Weld Microstructure in MIL A46100 Armor-Grade Martensitic Steel

    Science.gov (United States)

    Grujicic, M.; Arakere, A.; Ramaswami, S.; Snipes, J. S.; Yavari, R.; Yen, C.-F.; Cheeseman, B. A.; Montgomery, J. S.

    2013-06-01

    A conventional gas metal arc welding (GMAW) butt-joining process has been modeled using a two-way fully coupled, transient, thermal-mechanical finite-element procedure. To achieve two-way thermal-mechanical coupling, the work of plastic deformation resulting from potentially high thermal stresses is allowed to be dissipated in the form of heat, and the mechanical material model of the workpiece and the weld is made temperature dependent. Heat losses from the deposited filler-metal are accounted for by considering conduction to the adjoining workpieces as well as natural convection and radiation to the surroundings. The newly constructed GMAW process model is then applied, in conjunction with the basic material physical-metallurgy, to a prototypical high-hardness armor martensitic steel (MIL A46100). The main outcome of this procedure is the prediction of the spatial distribution of various crystalline phases within the weld and the heat-affected zone regions, as a function of the GMAW process parameters. The newly developed GMAW process model is validated by comparing its predictions with available open-literature experimental and computational data.

  20. Comparison of 2D and 3D modeled tumor motion estimation/prediction for dynamic tumor tracking during arc radiotherapy

    Science.gov (United States)

    Liu, Wu; Ma, Xiangyu; Yan, Huagang; Chen, Zhe; Nath, Ravinder; Li, Haiyun

    2017-05-01

    Many real-time imaging techniques have been developed to localize a target in 3D space or in a 2D beam’s eye view (BEV) plane for intrafraction motion tracking in radiation therapy. With tracking system latency, the 3D-modeled method is expected to be more accurate even in terms of 2D BEV tracking error. No quantitative analysis, however, has been reported. In this study, we simulated co-planar arc deliveries using respiratory motion data acquired from 42 patients to quantitatively compare the accuracy between 2D BEV and 3D-modeled tracking in arc therapy and to determine whether 3D information is needed for motion tracking. We used our previously developed low kV dose adaptive MV-kV imaging and motion compensation framework as a representative of 3D-modeled methods. It optimizes the balance between additional kV imaging dose and 3D tracking accuracy and solves the MLC blockage issue. With simulated Gaussian marker detection errors (zero mean and 0.39 mm standard deviation) and ~155/310/460 ms tracking system latencies, the mean percentage of time that the target moved  >2 mm from the predicted 2D BEV position are 1.1%/4.0%/7.8% and 1.3%/5.8%/11.6% for the 3D-modeled and 2D-only tracking, respectively. The corresponding average BEV RMS errors are 0.67/0.90/1.13 mm and 0.79/1.10/1.37 mm. Compared to the 2D method, the 3D method reduced the average RMS unresolved motion along the beam direction from ~3 mm to ~1 mm, resulting in on average only  <1% dosimetric advantage in the depth direction. Only for a small fraction of the patients, when tracking latency is long, the 3D-modeled method showed significant improvement of BEV tracking accuracy, indicating potential dosimetric advantage. However, if the tracking latency is short (~150 ms or less), those improvements are limited. Therefore, 2D BEV tracking has sufficient targeting accuracy for most clinical cases. The 3D technique is, however, still important in solving the MLC blockage problem

  1. Feedback Linearization Based Arc Length Control for Gas Metal Arc Welding

    DEFF Research Database (Denmark)

    Thomsen, Jesper Sandberg

    2005-01-01

    In this paper a feedback linearization based arc length controller for gas metal arc welding (GMAW) is described. A nonlinear model describing the dynamic arc length is transformed into a system where nonlinearities can be cancelled by a nonlinear state feedback control part, and thus, leaving only...

  2. Extroversion, social support and life satisfaction in old age: a mediation model.

    Science.gov (United States)

    Dumitrache, Cristina G; Rubio, Laura; Rubio-Herrera, Ramona

    2017-05-31

    The aim of this study was twofold: on the one hand to analyze whether extroversion predicts social support in older people, and on the other hand to determine if different types of social support mediate the effect that extroversion has on older people's life satisfaction. The sample comprised 406 community-dwelling older adults (M = 74.88, SD = 6.75) from urban areas of Granada, southern Spain. Extroversion was positively correlated with emotional (r = .23) and with affectionate support (r = .30). Extroversion and all types of social support also positively correlated with life satisfaction. The multiple mediation analysis revealed that when age, gender, marital status and loneliness were controlled, extroversion predicted emotional (B = .008, p fact supportive social relations are crucial for older people's life satisfaction. Also emotional and affectionate support constitutes important explanatory mechanisms of the indirect effect of extroversion on life satisfaction. Personality traits should be considered when interventions aimed at promoting life satisfaction in old age and successful aging are designed.

  3. Re-examining the general positivity model of subjective well-being: the discrepancy between specific and global domain satisfaction.

    Science.gov (United States)

    Oishi, S; Diener, E

    2001-08-01

    Three studies were conducted to examine the role of global life satisfaction in the discrepancy between specific and global domain satisfaction. Participants rated both global (e.g., education) and the corresponding, specific domain (e.g., professors, textbooks) satisfactions. In 3 studies, we found that individuals with higher life satisfaction evaluated global domain as a whole as more satisfying than those with lower life satisfaction, given the same level of satisfaction with specific domains. In Study 3, we also found that, given the same level of satisfaction during the previous 2 weeks, individuals with higher life satisfaction rated the global domains in general as more satisfying than those with lower life satisfaction. Overall, the association between globallife satisfaction and evaluative enhancement of global domains was most consistent in "self" and "social relationships." Finally, the effect of global life satisfaction on evaluative enhancement remained significant, controlling for extraversion and neuroticism.

  4. Contrasting sediment melt and fluid signatures for magma components in the Aeolian Arc: Implications for numerical modeling of subduction systems

    Science.gov (United States)

    Zamboni, Denis; Gazel, Esteban; Ryan, Jeffrey G.; Cannatelli, Claudia; Lucchi, Federico; Atlas, Zachary D.; Trela, Jarek; Mazza, Sarah E.; De Vivo, Benedetto

    2016-06-01

    The complex geodynamic evolution of Aeolian Arc in the southern Tyrrhenian Sea resulted in melts with some of the most pronounced along the arc geochemical variation in incompatible trace elements and radiogenic isotopes worldwide, likely reflecting variations in arc magma source components. Here we elucidate the effects of subducted components on magma sources along different sections of the Aeolian Arc by evaluating systematics of elements depleted in the upper mantle but enriched in the subducting slab, focusing on a new set of B, Be, As, and Li measurements. Based on our new results, we suggest that both hydrous fluids and silicate melts were involved in element transport from the subducting slab to the mantle wedge. Hydrous fluids strongly influence the chemical composition of lavas in the central arc (Salina) while a melt component from subducted sediments probably plays a key role in metasomatic reactions in the mantle wedge below the peripheral islands (Stromboli). We also noted similarities in subducting components between the Aeolian Archipelago, the Phlegrean Fields, and other volcanic arcs/arc segments around the world (e.g., Sunda, Cascades, Mexican Volcanic Belt). We suggest that the presence of melt components in all these locations resulted from an increase in the mantle wedge temperature by inflow of hot asthenospheric material from tears/windows in the slab or from around the edges of the sinking slab.

  5. A mass balance and isostasy model: Exploring the interplay between magmatism, deformation and surface erosion in continental arcs using central Sierra Nevada as a case study

    Science.gov (United States)

    Cao, Wenrong; Paterson, Scott

    2016-06-01

    A one-dimensional mass balance and isostasy model is used to explore the feedbacks between magmatism, deformation and surface erosion and how they together affect crustal thickness, elevation, and exhumation in a continental arc. The model is applied to central Sierra Nevada in California by parameterizing magma volume and deformational strain. The simulations capture the first-order Mesozoic-Cenozoic histories of crustal thickness, elevation and erosion including moderate Triassic crustal thickening and Jurassic crustal thinning followed by a strong Cretaceous crustal thickening, the latter resulting in a 60-70 km-thick crust plus a 20 km-thick arc eclogitic root, and a ˜5 km elevation in the Late Cretaceous. The contribution of contractional deformation to the crustal thickening is twice that of the magmatism. The contribution to elevation from magmatism is dampened by the formation of an eclogitic root. Erosion rate increases with the magnitude of crustal thickening (by magmatism and deformation) but its peak rate always lags behind the peak rate of thickening. We propose that thickened crust initially promotes magma generation by downward transport of materials to the magma source region, which may eventually jam the mantle wedge affecting the retro-arc underthrusting process and reducing arc magmatism.

  6. Visitors Satisfaction Measurement in Czech Tourism

    Directory of Open Access Journals (Sweden)

    Tomáš Sadílek

    2015-01-01

    Full Text Available The paper deals with describing the method of satisfaction measurement as a one of marketing techniques used for detecting visitors’ satisfaction in tourist regions in the Czech Republic. In the treatise, we try to analyse visitors’ satisfaction with the twenty four partial factors affecting total satisfaction. In the theoretical part of the paper, there are described methodological approaches to satisfaction measurement and presented various methods for satisfaction measurement with focus on the Satisfaction Pyramid method which is also used in the field part. Other presented methods are Customer Satisfaction Index, European Customer Satisfaction Model, Importance-Satisfaction Matrix, SERVQUAL Concept and KANO Model. Data have been collected all over the Czech Republic in years 2010 and 2011 twice every year. In the field part there are presented calculations of data and described total satisfaction, Satisfaction Index and partial satisfactions as well as level of satisfaction by tourist regions and correlations between partial satisfactions and total satisfaction which refers to importance of partial factors. Most important factors affecting total satisfaction are public transport, sport equipment, shopping possibilities, children attractions, orientation signage and free time programs.

  7. Arc spot grouping: An entanglement of arc spot cells

    Energy Technology Data Exchange (ETDEWEB)

    Kajita, Shin, E-mail: kajita.shin@nagoya-u.jp [EcoTopia Science Institute, Nagoya University, Nagoya 464-8603 (Japan); Hwangbo, Dogyun; Ohno, Noriyasu [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan); Tsventoukh, Mikhail M. [Lebedev Physical Institute, Russian Academy of Sciences, Moscow 119991 (Russian Federation); Barengolts, Sergey A. [Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow 119991 (Russian Federation)

    2014-12-21

    In recent experiments, clear transitions in velocity and trail width of an arc spot initiated on nanostructured tungsten were observed on the boundary of the thick and thin nanostructured layer regions. The velocity of arc spot was significantly decreased on the thick nanostructured region. It was suggested that the grouping decreased the velocity of arc spot. In this study, we try to explain the phenomena using a simple random walk model that has properties of directionality and self-avoidance. And grouping feature was added by installing an attractive force between spot cells with dealing with multi-spots. It was revealed that an entanglement of arc spot cells decreased the spot velocity, and spot cells tend to stamp at the same location many times.

  8. Effects of physical education, extracurricular sports activities, and leisure satisfaction on adolescent aggressive behavior: A latent growth modeling approach.

    Science.gov (United States)

    Park, Sanghyun; Chiu, Weisheng; Won, Doyeon

    2017-01-01

    The present study aimed to investigate the longitudinal influence of physical education classes, extracurricular sports activities, and leisure satisfaction on aggressive behavior among South Korean adolescents. Data were drawn from the Korea Youth Panel Survey. We used latent growth curve modeling to explain the growth trajectory of adolescent aggressive behaviors and a multi-group analysis to investigate gender differences in aggressive behavior. The results indicated that adolescents' aggressive behavior significantly changed with age. There were significant gender-based differences in the level of and changes in aggressive behavior over time. Both extracurricular sports activities and leisure satisfaction had significant influences on the changes in adolescents' aggressive behavior with age, whereas physical education classes did not.

  9. Measuring the value of nonwage employee benefits: building a model of the relation between benefit satisfaction and value.

    Science.gov (United States)

    Weathington, Bart L; Jones, Allan P

    2006-11-01

    Researchers have commonly assumed benefits that employees view as more valuable have a greater influence on their attitudes and behaviors. Researchers have used 2 common methods to measure benefit value: attaching a monetary value to benefits and using self-reports of benefit importance. The present authors propose that the 2 approaches are conceptually distinct and have different implications. They use a social exchange perspective to justify this distinction and integrate both approaches and benefit satisfaction into a more comprehensive model of benefit perception. Results suggest that both measures have practical applications depending on the nature of the exchange relationship between the organization and employees. However, this relationship depends on the specific benefit and on employee satisfaction with that benefit. Some benefits lend themselves to a monetary estimate, whereas others lend themselves more to a nonmonetary valuation.

  10. Patient Safety and Satisfaction Drivers in Emergency Departments Re-visited - An Empirical Analysis using Structural Equation Modeling

    DEFF Research Database (Denmark)

    Sørup, Christian Michel; Jacobsen, Peter

    2014-01-01

    How can emergency department (ED) decision makers contribute to increase patient satisfaction rates? This question has been thoroughly investigated in many hospital departments but not so much in the ED, which has led to a number of untested hypotheses. Maximising value-added activities seen from...... a patient’s perspective has become an essential outcome in health care, meaning that the untested hypotheses are in need of quantitative testing. This study proposes an integrated framework in which four latent constructs reflecting principal aspects of patient care are tested. The four constructs...... are entitled safety and satisfaction, waiting time, information delivery, and infrastructure accordingly. As an empirical foundation, a recently published comprehensive survey in 11 Danish EDs is analysed in depth using structural equation modeling (SEM). Consulting the proposed framework, ED decision makers...

  11. Study on Quality and Customer Satisfaction Model%质量与顾客满意模型研究

    Institute of Scientific and Technical Information of China (English)

    熊新佳

    2013-01-01

    本文给出了一种质量与顾客满意之间的模型,从质量与顾客满意的关系研究出发,提出了质量贬值区、质量增值区和质量溢出区的划分原则,并为企业规划永续经营的质量战略提供了决策指南.%This paper presents a model between quality and customer satisfaction,based on the study of the relationship between quality and customer satisfaction,the principle for dividing the quality into quality devaluation area,quality value-added area and quality overflow area are provided,and a decision-making guidance for the enterprises developing their sustainable quality management strategy was proposed.

  12. Relationship model among sport event image, destination image, and tourist satisfaction of Tour de Singkarak in West Sumatera

    Directory of Open Access Journals (Sweden)

    Ratni Prima Lita

    2015-06-01

    Full Text Available Sport events Tour de Singkarak (TDS can increase tourist arrivals to West Sumatera. At least at the time of execution, the majority of participants and team supporters (sports tourist brings the families. Although there are claims about the arrival of tourists, it requires to see the impact of sports events TDS and comprehensive long-term basis to the West Sumatera image as a tourist destination (destination image and its impact on tourist satisfaction. This study re-conceptualizes the interconnec-tedness among sport event image, tourist destination image, perception and the effect on tourists satisfaction. The investigation on this interconnection is expected to reveal empirically tested model. As an explanatory in nature, this study uses explanatory survey and cross sectional data. In total of 100 spectators of Tour de Singkarak in West Sumatera, they got involved in survey and they were taken by convenience sam-pling technique. Analysis of this data was done by using variance based structural equation modeling. It was found that sport event image and destination image signifi-cantly affect the satisfaction of spectators of Tour de Singkarak.

  13. Fluid Source-based Modeling of Melt Initiation within the Subduction Zone Mantle Wedge: Implications for Geochemical Trends in Arc Lavas

    Science.gov (United States)

    Hebert, L. B.; Asimow, P. D.; Antoshechkina, P. M.

    2008-12-01

    The GyPSM-S (Geodynamic and Petrological Synthesis Model for Subduction) scheme couples a petrological model (pHMELTS) with a 2D thermal and variable viscosity flow model (ConMan), to describe and compare fundamental processes occurring within subduction zones. Here we supplement basic GyPSM-S models with a more sophisticated treatment of trace element partitioning in the fluid phase and of melt transport regimes to investigate the influences of slab fluid source lithology and fluid transport mechanisms on melt geochemistry, the implications of mantle source depletion related to fluid fluxing, and potential melt migration processes. Changing model parameters indicate that slab age and slab dip are the primary controls on slab-adjacent low-viscosity channel (LVC) shape and thickness, due to changes in the fluid release patterns. Slab age and convergence velocity, which contribute to the slab thermal structure, are significant for the locations of dehydration reactions within the different lithological layers of the slab. The fluid source lithology determines the fluid flux and the fluid-mobile trace element input to the wedge. This study focuses on two cases that represent extremes within our model set, an old slab with a low rate of convergence and and a relatively young slab with a higher rate of convergence. Results are compared to actual geochemical datasets for the Izu-Bonin intra-oceanic subduction system and the Central Costa Rican part of the Central American arc. We find that there is a progression of geochemical characteristics described in studies of cross-arc and along-arc lavas that can be duplicated assuming (i) limited fluid-rock interaction within the mantle wedge and (ii) that melt migration preserves the spatial distinction among melts initiated in different areas of the wedge. Specifically, volcanic front lavas have significant contributions from shallower slab fluid sources, and rear-arc lavas have significant contributions from deeper slab fluid

  14. Emotional Exhaustion and Job Satisfaction in Airport Security Officers - Work-Family Conflict as Mediator in the Job Demands-Resources Model.

    Science.gov (United States)

    Baeriswyl, Sophie; Krause, Andreas; Schwaninger, Adrian

    2016-01-01

    The growing threat of terrorism has increased the importance of aviation security and the work of airport security officers (screeners). Nonetheless, airport security research has yet to focus on emotional exhaustion and job satisfaction as major determinants of screeners' job performance. The present study bridges this research gap by applying the job demands-resources (JD-R) model and using work-family conflict (WFC) as an intervening variable to study relationships between work characteristics (workload and supervisor support), emotional exhaustion, and job satisfaction in 1,127 screeners at a European airport. Results of structural equation modeling revealed that (a) supervisor support as a major job resource predicted job satisfaction among screeners; (b) workload as a major job demand predicted their emotional exhaustion; and (c) WFC proved to be a promising extension to the JD-R model that partially mediated the impact of supervisor support and workload on job satisfaction and emotional exhaustion. Theoretical and practical implications are discussed.

  15. Satisfaction and sustainability: a realist review of decentralized models of perinatal surgery for rural women.

    Science.gov (United States)

    Kornelsen, Jude; McCartney, Kevin; Williams, Kim

    2016-01-01

    This article was developed as part of a larger realist review investigating the viability and efficacy of decentralized models of perinatal surgical services for rural women in the context of recent and ongoing service centralization witnessed in many developed nations. The larger realist review was commissioned by the British Columbia Ministry of Health and Perinatal Services of British Columbia, Canada. Findings from that review are addressed in this article specific to the sustainability of rural perinatal surgical sites and the satisfaction of providers that underpins their recruitment to and retention at such sites. A realist method was used in the selection and analysis of literature with the intention to iteratively develop a sophisticated understanding of how perinatal surgical services can best meet the needs of women who live in rural and remote environments. The goal of a realist review is to examine what works for whom under what circumstances and why. The high sensitivity search used language (English) and year (since 1990) limiters in keeping with both a realist and rapid review tradition of using reasoned contextual boundaries. No exclusions were made based on methodology or methodological approach in keeping with a realist review. Databases searched included MEDLINE, PubMed, EBSCO, CINAHL, EBM Reviews, NHS Economic Evaluation Database and PAIS International for literature in December 2013. Database searching produced 103 included academic articles. A further 59 resources were added through pearling and 13 grey literature reports were added on recommendation from the commissioner. A total of 42 of these 175 articles were included in this article as specific to provider satisfaction and service sustainability. Operative perinatal practice was found to be a lynchpin of sustainable primary and surgical services in rural communities. Rural shortages of providers, including challenges with recruitment and retention, were found to be a complex issue, with

  16. Modeling of the Flow, Temperature and Concentration Fields in an Arc Plasma Reactor with Argon-Nitrogen Atmosphere

    National Research Council Canada - National Science Library

    Fudolig, Agustin M; Nogami, Hiroshi; Yagi, Jun-ichiro

    1996-01-01

    A mathematical formulation was developed for describing the flow behavior, temperature profile and concentration fields in pure or mixed argon and nitrogen arc plasmas impinging on a metal target inside a reactor...

  17. Application of Job Demands-Resources model in research on relationships between job satisfaction, job resources, individual resources and job demands

    Directory of Open Access Journals (Sweden)

    Adrianna Potocka

    2013-04-01

    Full Text Available Background: The aim of this study was to explore the relationships between job demands, job resourses, personal resourses and job satisfaction and to assess the usefulness of the Job Demands-Resources (JD-R model in the explanation of these phenomena. Materials and Methods: The research was based on a sample of 500 social workers. The "Psychosocial Factors" and "Job satisfaction" questionnaires were used to test the hypothesis. Results: The results showed that job satisfaction increased with increasing job accessibility and personal resources (r = 0.44; r = 0.31; p < 0.05. The analysis of variance (ANOVA indicated that job resources and job demands [F(1.474 = 4.004; F(1.474 = 4.166; p < 0.05] were statistically significant sources of variation in job satisfaction. Moreover, interactions between job demands and job resources [F(3,474 = 2.748; p < 0.05], as well as between job demands and personal resources [F(3.474 = 3.021; p < 0.05] had a significant impact on job satisfaction. The post hoc tests showed that 1 in low job demands, but high job resources employees declared higher job satisfaction, than those who perceived them as medium (p = 0.0001 or low (p = 0.0157; 2 when the level of job demands was perceived as medium, employees with high personal resources declared significantly higher job satisfaction than those with low personal resources (p = 0.0001. Conclusion: The JD-R model can be used to investigate job satisfaction. Taking into account fundamental factors of this model, in organizational management there are possibilities of shaping job satisfaction among employees. Med Pr 2013;64(2:217–225

  18. The longitudinal association of relationship satisfaction and sexual satisfaction in long-term relationships.

    Science.gov (United States)

    Fallis, Erin E; Rehman, Uzma S; Woody, Erik Z; Purdon, Christine

    2016-10-01

    Several prominent models of relationship satisfaction and sexual satisfaction imply directional relationships between these constructs (e.g., attachment theory, social exchange models of relationship satisfaction, the interpersonal exchange model of sexual satisfaction). Previous research has demonstrated that sexual satisfaction and relationship satisfaction are distinct but correlated constructs, but relatively few studies have examined how they are related over time. Thus, the purpose of this study was to examine this association. A sample of heterosexual couples (N = 113) completed a longitudinal study spanning 2 years. At Times 1 and 2 they completed measures of relationship satisfaction and sexual satisfaction. Data were analyzed according to the principles of the actor-partner interdependence model using structural equation modeling. Significant actor effects were detected such that, for both men and women, one's own earlier sexual satisfaction predicted one's later relationship satisfaction. In contrast, one's own earlier relationship satisfaction did not significantly predict one's subsequent sexual satisfaction. Sexual satisfaction was a stronger predictor of subsequent relationship satisfaction for men than women. There were no significant partner effects. These results contribute to our theoretical understanding of sexuality and sexual satisfaction in the context of long-term relationships by providing support for theories that conceptualize sexual satisfaction as one factor that contributes to relationship satisfaction. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

  19. The Impact of Marketing Strategies and Satisfaction on Student Loyalty: A Structural Equation Model Approach

    Science.gov (United States)

    Chen, Yu-Chuan

    2016-01-01

    The dynamic changes in higher education observed over the last 20 years have transformed the educational market. The potential value of promoting student satisfaction and loyalty in higher education has become a significant issue. This study investigates the directions and strengths of the relationships among marketing strategies, student…

  20. Modeling Retirees' Life Satisfaction Levels: The Role of Recreational, Life Cycle and Socio-Environmental Elements.

    Science.gov (United States)

    Romsa, Gerald; And Others

    1985-01-01

    This study investigated satisfaction with retirement as a function of life cycle forces, socioenvironmental influences, and the degree of fulfillment of Maslow's hierarchy of needs through participation in recreational leisure activities. The findings from interviews with 300 retirees are discussed. (Author/MT)

  1. Determinants of Customers’ Satisfaction in the Nigerian Aviation Industry Using Analytic Hierarchy Process (AHP Model

    Directory of Open Access Journals (Sweden)

    B. E A. Oghojafor

    2014-08-01

    Full Text Available The aviation industry in Africa‟s most populous nation has been experiencing an explosive growth in recent years with older domestic operators fighting competing new players. The expansion has given Nigerians a wider choice of airlines, many of them flying with new or recently refurbished aircraft, which have helped reverse the country‟s situation for air safety in the wake of a spate of crashes six years ago. This paper applied the Analytic Hierarchy Process to identify the determinants of customers‟ satisfaction in the Nigerian aviation industry. To achieve this aim, a sample of 100 customers were drawn from among customers (air passengers at the Muritala Mohammed Airport 2 in Lagos, Nigeria, using convenience sampling and snowballing techniques. The quantitative approach was used to analysed the data obtained by using descriptive statistics and the Expert Choice 2000 a software designed to analyse AHP data. Findings show that customers of the aviation industry players derived their satisfaction when operators respond quickly to their requests and provides information in relation to their flights. Although there is little relative preference in terms of customers‟ satisfaction regarding the services provided by the aviation operators in Nigeria, customers‟ satisfaction is derived essentially from how the operators handle their ticketing and reservation services.

  2. WIL Curriculum Design and Student Learning: A Structural Model of Their Effects on Student Satisfaction

    Science.gov (United States)

    Smith, Calvin; Worsfold, Kate

    2014-01-01

    With the increasing adoption of work-integrated learning (WIL) as a feature of curricula, the idea of student satisfaction takes on a new dimension--students' experiences on placement are not routinely under the control of university academic staff, yet universities will ultimately be held responsible for the quality of students'…

  3. Peers' Perceived Support, Student Engagement in Academic Activities and Life Satisfaction: A Structural Equation Modeling Approach

    Science.gov (United States)

    Hakimzadeh, Rezvan; Besharat, Mohammad-Ali; Khaleghinezhad, Seyed Ali; Ghorban Jahromi, Reza

    2016-01-01

    This study investigates the relationships among peers' perceived support, life satisfaction, and student engagement in academic activities. Three hundred and fifteen Iranian students (172 boys and 143 girls) who were studying in one suburb of Tehran participated in this study. All participants were asked to complete Peers' Perceived Support scale…

  4. Factors Affecting Perceived Learning, Satisfaction, and Quality in the Online MBA: A Structural Equation Modeling Approach

    Science.gov (United States)

    Sebastianelli, Rose; Swift, Caroline; Tamimi, Nabil

    2015-01-01

    The authors examined how six factors related to content and interaction affect students' perceptions of learning, satisfaction, and quality in online master of business administration (MBA) courses. They developed three scale items to measure each factor. Using survey data from MBA students at a private university, the authors estimated structural…

  5. WIL Curriculum Design and Student Learning: A Structural Model of Their Effects on Student Satisfaction

    Science.gov (United States)

    Smith, Calvin; Worsfold, Kate

    2014-01-01

    With the increasing adoption of work-integrated learning (WIL) as a feature of curricula, the idea of student satisfaction takes on a new dimension--students' experiences on placement are not routinely under the control of university academic staff, yet universities will ultimately be held responsible for the quality of students' placement…

  6. Modeling Retirees' Life Satisfaction Levels: The Role of Recreational, Life Cycle and Socio-Environmental Elements.

    Science.gov (United States)

    Romsa, Gerald; And Others

    1985-01-01

    This study investigated satisfaction with retirement as a function of life cycle forces, socioenvironmental influences, and the degree of fulfillment of Maslow's hierarchy of needs through participation in recreational leisure activities. The findings from interviews with 300 retirees are discussed. (Author/MT)

  7. Life satisfaction and age : Dealing with underidentification in age-period-cohort models

    NARCIS (Netherlands)

    de Ree, Joppe; Alessie, Rob

    2011-01-01

    Recent literature typically finds a U shaped relationship between life satisfaction and age. Age profiles, however, are not identified without forcing arbitrary restrictions on the cohort and/or time profiles. In this paper we report what can be identified about the relationship between life satisfa

  8. Contact Disturbances, Self-Esteem and Life Satisfaction of University Students: A Structural Equation Modelling Study

    Science.gov (United States)

    Tagay, Özlem

    2015-01-01

    Problem Statement: A literature analysis revealed that contact disturbances, self-esteem and life satisfaction have been examined in different studies separately. In particular, the researchers observed that the studies conducted on Gestalt contact disturbances are limited in number. In this study, the variables of contact disturbances,…

  9. Online Finance and Economics Courses: A Comparative Study of Course Satisfaction and Outcomes across Learning Models

    Science.gov (United States)

    Wiechowski, Linda; Washburn, Terri L.

    2014-01-01

    Student learning outcomes and course satisfaction scores are two key considerations when assessing the success of any degree program. This empirical study was based upon more than 3,000 end-of-semester course evaluations collected from 171 courses in the 2010-2011 academic year. The study, conducted at a Midwestern business college, considered the…

  10. Resistance Characteristics of Arc in Long Air Gap

    Institute of Scientific and Technical Information of China (English)

    YU Zhanqing; YU Junjie; ZENG Rong; CHEN He; PENG Xiang

    2013-01-01

    Arc resistance is an important parameter for characterizing long arcs in air,and its laboratory testing is of importance for accurate arc modeling of electromagnetic transient caused by short circuit fault.Therefore,we constructed an experimental system to study the characteristics of long AC arc in air.Driven by currents of 10 kA or 40 kA (root mean square value),the system produces arcs with different initial lengths of 1 m,2 m and 4 m,and the movement of the arcs are captured by a high-speed camera.After performing experiments using the system,we carried out analysis and comparisons of the arc resistance of arcs with different lengths and different currents,as well as a study of the relationship between the macro-morphology and the resistance of the arcs.Conclusions were drawn from the experimental results:the arc voltage had obvious saturation characteristics; the arc resistance increased with the increase of arc length and the decrease of current; the arcs bended or extended significantly in time and the peak arc voltage within a single cycle increased correspondingly; the arcs had voltage and current in the same phase.In the end,a formula of arc resistance based on the experiment results is derived.

  11. On arc efficiency in gas tungsten arc welding

    Directory of Open Access Journals (Sweden)

    Nils Stenbacka

    2013-12-01

    Full Text Available The aim of this study was to review the literature on published arc efficiency values for GTAW and, if possible, propose a narrower band. Articles between the years 1955 - 2011 have been found. Published arc efficiency values for GTAW DCEN show to lie on a wide range, between 0.36 to 0.90. Only a few studies covered DCEP - direct current electrode positive and AC current. Specific information about the reproducibility in calorimetric studies as well as in modeling and simulation studies (considering that both random and systematic errors are small was scarce. An estimate of the average arc efficiency value for GTAW DCEN indicates that it should be about 0.77. It indicates anyway that the GTAW process with DCEN is an efficient welding method. The arc efficiency is reduced when the arc length is increased. On the other hand, there are conflicting results in the literature as to the influence of arc current and travel speed.

  12. Study on the Degree of Rural Empty Nesters’ Satisfaction with Life Quality Based on Ordered Logit-ISM Model

    Institute of Scientific and Technical Information of China (English)

    Huanan; ZHANG; Jin; FANG; Hongxia; BI

    2015-01-01

    It is an ultimate objective to solve the rural supporting problems to improve life satisfaction of empty nesters in rural areas. Based on data of 546 empty nesters in rural areas,the factors influencing life quality satisfaction of empty nesters in rural areas are firstly analyzed using ordered logit model,and then the relationship between various influencing factors is analyzed using ISM. Study shows that health condition,degree of participation in cultural and sports activities,spouse status,family harmony degree,annual family income,degree of worry about life,degree of government and social care and pension mode,have a significant impact on the life quality satisfaction of empty nesters in rural areas.The degree of worry about life,degree of government and social care are surface direct factors; degree of participation in cultural and sports activities,family harmony degree,pension mode are intermediate indirect factors; health condition,spouse status and annual family income are deep root factors.

  13. A Developing Model Of Relationship Among Service Quality, Consumer Satisfaction, Loyalty and Word of Mouth In Islamic Banking

    Directory of Open Access Journals (Sweden)

    Suryani Suryani

    2015-03-01

    Full Text Available This  research  aims  to  develop  a  measurement  tool  of  service  quality  in  Islamic banking sector, and examine its relationship among satisfaction, word of mouth (WOM,  and  consumer  loyalty.  A  convenience  sampling  of  235  respondents collected  from  seven  locations  in  the  Lhokseumawe,  Aceh.  Partial  least  square -structural equation modeling- (PLS-SEM was used to test the research hypotheses. The results revealed that the quality of service has four dimensions, they are: service portfolio and assurance/SPA, tangibles/TAN, reliability of communication/COM, and Islamic values/IVA. The PLS-SEM results suggest that SPA and COM are dominant factors affecting satisfaction, and satisfaction were significantly related to WOM and loyalty. Loyalty also positively and significantly related to WOM.DOI:10.15408/aiq.v7i1.1357

  14. Argon 4s and 4p Excited States Atomic Data Applied in ARC-JET Modeling

    Directory of Open Access Journals (Sweden)

    K. Katsonis

    2011-01-01

    Full Text Available Evaluated atomic data concerning the 4s and 4p configurations of Ar I are averaged in order to simplify their use in various cases of Ar plasma modeling and diagnostics. These data are used here to model a low-power arcjet, running with Argon at low pressure. In so doing, they are explicitly introduced in the chemical processes included in a fluid Navier-Stokes type code, allowing for evaluation of the spectroscopically measurable level populations and of the electronic temperatures. The characteristics of the model are described and the main processes are discussed in view of the results of the calculations.

  15. Micro–macro-characterisation and modelling of mechanical properties of gas metal arc welded (GMAW) DP600 steel

    Energy Technology Data Exchange (ETDEWEB)

    Ramazani, A., E-mail: ali.ramazani@iehk.rwth-aachen.de [Department of Ferrous Metallurgy, RWTH Aachen University, D-52072 Aachen (Germany); Mukherjee, K. [Department of Ferrous Metallurgy, RWTH Aachen University, D-52072 Aachen (Germany); Abdurakhmanov, A. [Welding and Joining Institute, RWTH Aachen University, D-52072 Aachen (Germany); Prahl, U. [Department of Ferrous Metallurgy, RWTH Aachen University, D-52072 Aachen (Germany); Schleser, M.; Reisgen, U. [Welding and Joining Institute, RWTH Aachen University, D-52072 Aachen (Germany); Bleck, W. [Department of Ferrous Metallurgy, RWTH Aachen University, D-52072 Aachen (Germany)

    2014-01-01

    Dual-phase (DP) steels show combined high strength and adequate formability. However, during welding, their microstructural feature of dispersion of hard martensite islands in the soft ferrite matrix is lost and the properties deteriorate. The current research aims to study the mechanical properties of the welded joint, taking into account the effect of features of all regions, such as microstructure, chemical composition and the area fraction, on the macroscopic mechanical properties of the welded joint. Hot rolled DP 600 steel was gas metal arc welded (GMAW) and tensile specimens were made with a welded joint. In the heat-affected zone (HAZ), the microstructure varied from bainite to coarse grained ferrite and tempered martensite. Chemical composition of every quantified region in the welded specimen was also identified using electron probe microanalysis (EPMA). Macromechanical FE modelling was employed to simulate the mechanical properties of the welded tensile specimen. 2D representative volume elements (RVE) for different parts of the welded region were constructed from real microstructure. 2D simulated flow curves were corrected to 3Ds using a developed correlation factor. Finally, the tensile test of welded material with inhomogeneous morphology was simulated and good agreement between experimental and predicted flow curve was achieved.

  16. Detection of cerebral microbleeds with quantitative susceptibility mapping in the ArcAbeta mouse model of cerebral amyloidosis

    Science.gov (United States)

    Klohs, Jan; Deistung, Andreas; Schweser, Ferdinand; Grandjean, Joanes; Dominietto, Marco; Waschkies, Conny; Nitsch, Roger M; Knuesel, Irene; Reichenbach, Jürgen R; Rudin, Markus

    2011-01-01

    Cerebral microbleeds (CMBs) are findings in patients with neurological disorders such as cerebral amyloid angiopathy and Alzheimer's disease, and are indicative of an underlying vascular pathology. A diagnosis of CMBs requires an imaging method that is capable of detecting iron-containing lesions with high sensitivity and spatial accuracy in the presence of potentially confounding tissue abnormalities. In this study, we investigated the feasibility of quantitative magnetic susceptibility mapping (QSM), a novel technique based on gradient-recalled echo (GRE) phase data, for the detection of CMBs in the arcAβ mouse, a mouse model of cerebral amyloidosis. Quantitative susceptibility maps were generated from phase data acquired with a high-resolution T2*-weighted GRE sequence at 9.4 T. We examined the influence of different regularization parameters on susceptibility computation; a proper adjustment of the regularization parameter minimizes streaking artifacts and preserves fine structures. In the present study, it is shown that QSM provides increased detection sensitivity of CMBs and improved contrast when compared with GRE magnitude imaging. Furthermore, QSM corrects for the blooming effect observed in magnitude and phase images and depicts both the localization and spatial extent of CMBs with high accuracy. Therefore, QSM may become an important tool for diagnosing CMBs in neurological diseases. PMID:21847134

  17. Miami 1/3 arc-second MHW Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  18. Tampa Bay 1/3 arc-second MHW Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  19. The optimization of welding regime parameters at shielded metal arc welding (SMAW) by mathematical modeling

    National Research Council Canada - National Science Library

    V. Petrescu; G. Paraschiv; D. Dobrotă

    2016-01-01

    The realized researches followed the determining of mathematical models that allow the optimization of the welding process in order to obtain welded joints with certain values of the mechanical characteristics...

  20. King Cove, Alaska 8 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  1. Cold Bay, Alaska 8 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  2. King Cove, Alaska 8/15 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  3. Puget Sound 1/3 arc-second MHW Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  4. Central Florida 1/3 arc-second NAVD 88 Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  5. Tutuila, American Samoa 1/3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  6. Perryville and Ivanof Bay, Alaska 1/3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  7. Cold Bay, Alaska 8/15 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  8. Implementation Weather-Type Models of Capacitated Arc Routing Problem via Heuristics

    National Research Council Canada - National Science Library

    Zuhaimy Ismail; Mohammad F. Ramli

    2011-01-01

    ...), a model that represents vehicles operation in waste collection. In general, we studied the element of rain drops that affected the collected waste weight in total by imposed a new variable namely rainy weight age...

  9. Puget Sound 1/3 arc-second NAVD 88 Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  10. Astoria, Oregon 1/3 arc-second MHW Coastal Digital Elevation Model Vers.3

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Centers for Environmental Information (NCEI) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These...

  11. Chignik, Alaska 1/3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  12. King Cove, Alaska 8/3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  13. Central Florida 1/3 arc-second MHW Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  14. Tampa Bay 1/3 arc-second NAVD 88 Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  15. Miami 1/3 arc-second NAVD 88 Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  16. Cold Bay, Alaska 8/3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the...

  17. Kodiak, Alaska 1/3 arc-second Coastal Digital Elevation Model

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions. These integrated...

  18. Electrode Evaporation Effects on Air Arc Behavior

    Institute of Scientific and Technical Information of China (English)

    LI Xingwen; CHEN Degui; LI Rui; WU Yi; NIU Chunping

    2008-01-01

    A numerical study of the effects of copper and silver vapours on the air arc behavior is performed. The commercial software FLUENT is adapted and modified to develop a two-dimensional magneto-hydrodynamic (MHD) models of arc with the thermodynamic properties and transport coefficients, net emission coefficient for the radiation model of 99% ai-1% Cu, 99% air-1% Ag, and pure air, respectively. The simulation result demonstrates that vaporization of the electrode material may cool the arc center region and reduce the arc velocity. The effects of Ag vapour are stronger compared to those of Cu vapour.

  19. Neotectonic development of the El Salvador Fault Zone and implications for deformation in the Central America Volcanic Arc: Insights from 4-D analog modeling experiments

    Science.gov (United States)

    Alonso-Henar, Jorge; Schreurs, Guido; Martinez-Díaz, José Jesús; Álvarez-Gómez, José Antonio; Villamor, Pilar

    2015-01-01

    The El Salvador Fault Zone (ESFZ) is an active, approximately 150 km long and 20 km wide, segmented, dextral strike-slip fault zone within the Central American Volcanic Arc striking N100°E. Although several studies have investigated the surface expression of the ESFZ, little is known about its structure at depth and its kinematic evolution. Structural field data and mapping suggest a phase of extension, at some stage during the evolution of the ESFZ. This phase would explain dip-slip movements on structures that are currently associated with the active, dominantly strike slip and that do not fit with the current tectonic regime. Field observations suggest trenchward migration of the arc. Such an extension and trenchward migration of the volcanic arc could be related to slab rollback of the Cocos plate beneath the Chortis Block during the Miocene/Pliocene. We carried out 4-D analog model experiments to test whether an early phase of extension is required to form the present-day fault pattern in the ESFZ. Our experiments suggest that a two-phase tectonic evolution best explains the ESFZ: an early pure extensional phase linked to a segmented volcanic arc is necessary to form the main structures. This extensional phase is followed by a strike-slip dominated regime, which results in intersegment areas with local transtension and segments with almost pure strike-slip motion. The results of our experiments combined with field data along the Central American Volcanic Arc indicate that the slab rollback intensity beneath the Chortis Block is greater in Nicaragua and decreases westward to Guatemala.

  20. The theory of reasoned action as parallel constraint satisfaction: towards a dynamic computational model of health behavior.

    Science.gov (United States)

    Orr, Mark G; Thrush, Roxanne; Plaut, David C

    2013-01-01

    The reasoned action approach, although ubiquitous in health behavior theory (e.g., Theory of Reasoned Action/Planned Behavior), does not adequately address two key dynamical aspects of health behavior: learning and the effect of immediate social context (i.e., social influence). To remedy this, we put forth a computational implementation of the Theory of Reasoned Action (TRA) using artificial-neural networks. Our model re-conceptualized behavioral intention as arising from a dynamic constraint satisfaction mechanism among a set of beliefs. In two simulations, we show that constraint satisfaction can simultaneously incorporate the effects of past experience (via learning) with the effects of immediate social context to yield behavioral intention, i.e., intention is dynamically constructed from both an individual's pre-existing belief structure and the beliefs of others in the individual's social context. In a third simulation, we illustrate the predictive ability of the model with respect to empirically derived behavioral intention. As the first known computational model of health behavior, it represents a significant advance in theory towards understanding the dynamics of health behavior. Furthermore, our approach may inform the development of population-level agent-based models of health behavior that aim to incorporate psychological theory into models of population dynamics.

  1. The theory of reasoned action as parallel constraint satisfaction: towards a dynamic computational model of health behavior.

    Directory of Open Access Journals (Sweden)

    Mark G Orr

    Full Text Available The reasoned action approach, although ubiquitous in health behavior theory (e.g., Theory of Reasoned Action/Planned Behavior, does not adequately address two key dynamical aspects of health behavior: learning and the effect of immediate social context (i.e., social influence. To remedy this, we put forth a computational implementation of the Theory of Reasoned Action (TRA using artificial-neural networks. Our model re-conceptualized behavioral intention as arising from a dynamic constraint satisfaction mechanism among a set of beliefs. In two simulations, we show that constraint satisfaction can simultaneously incorporate the effects of past experience (via learning with the effects of immediate social context to yield behavioral intention, i.e., intention is dynamically constructed from both an individual's pre-existing belief structure and the beliefs of others in the individual's social context. In a third simulation, we illustrate the predictive ability of the model with respect to empirically derived behavioral intention. As the first known computational model of health behavior, it represents a significant advance in theory towards understanding the dynamics of health behavior. Furthermore, our approach may inform the development of population-level agent-based models of health behavior that aim to incorporate psychological theory into models of population dynamics.

  2. 论ARCS模型对外语学习动机的激发%Arousing Learners’Motivation of Foreign Language Learning with ARCS Model

    Institute of Scientific and Technical Information of China (English)

    戴延红

    2012-01-01

      学习动机是影响学生学习的一个重要的情感因素,而 A RCS 动机模型的科学运用对于学生外语学习动机具有积极而有效的激发和强化作用。本文主要阐述了与 A RCS 动机模型相关的学习动机要素和 A RCS 教学设计模型,并对如何利用该模型在学生的外语学习中去激发和强化学生的学习动机提出了相应的建议。%  M otivation is the most important psychological factor of influence on learners’learning . Kel-ler’s ARCS model is a good model of teaching design to arouse and streng then the student’s motivation of foreign language learning . This paper states the motivation and ARCS model,and ho w to arouse and streng then learners’motivation of foreign language learning English in college English class with ARCS model .

  3. Gas arc constriction for plasma arc welding

    Science.gov (United States)

    McGee, William F. (Inventor); Rybicki, Daniel J. (Inventor)

    1994-01-01

    A welding torch for plasma arc welding apparatus has an inert gas applied circumferentially about the arc column externally of the constricting nozzle so as to apply a constricting force on the arc after it has exited the nozzle orifice and downstream of the auxiliary shielding gas. The constricting inert gas is supplied to a plenum chamber about the body of the torch and exits through a series of circumferentially disposed orifices in an annular wall forming a closure at the forward end of the constricting gas plenum chamber. The constricting force of the circumferential gas flow about the arc concentrates and focuses the arc column into a more narrow and dense column of energy after exiting the nozzle orifice so that the arc better retains its energy density prior to contacting the workpiece.

  4. MATHEMATICAL MODELING OF PROCESSES IN THE ELECTRIC ARC SYNTHESIS OF CARBON NANOTUBES

    Directory of Open Access Journals (Sweden)

    G. V. Abramov

    2013-01-01

    Full Text Available In this work the mathematical model of heat transfer at synthesis of CNTs considering heat removal from a zone evaporation of the anode are synthesized. Influence of parameters of the heat-removing element on the width of a zone of formation of CNTs is researched.

  5. Modeling Employee Satisfaction in Relation to CSR Practices and Attraction and Retention of Top Talent

    OpenAIRE

    Simona VINEREAN; CETINA Iuliana; Luigi DUMITRESCU

    2013-01-01

    In today’s economy, companies must work harder than ever to attract, retain and motivate talented employees in order to foster employee satisfaction, and in order to do so, CSR practices can provide a strategic tool. A green company no longer denotes solely the promotion of green products or reduction of energy consumption, as it has to incorporate proactive and innovative means of tracking sustainability while involving employees in such corporate behavior. This paper highlights an empirical...

  6. Developing a conceptual model for the internal data source to measure customer satisfaction

    OpenAIRE

    2006-01-01

    Traditional CSM approach is performed at certain frequencies. The gap between such events can be termed as a ‘blind period’, because customer satisfaction is left unobserved and unmanaged. The blind period may sometimes accelerate the growth of customer dissatisfaction. One way to eliminate the impact of the blind period is to reduce the gap between CSM events. The initial assessment indicates that conducting CSM more frequently, may weaken the accuracy of measurement, and increase the cost o...

  7. Does active ageing contribute to life satisfaction for older people? Testing a new model of active ageing.

    Science.gov (United States)

    Marsillas, Sara; De Donder, Liesbeth; Kardol, Tinie; van Regenmortel, Sofie; Dury, Sarah; Brosens, Dorien; Smetcoren, An-Sofie; Braña, Teresa; Varela, Jesús

    2017-09-01

    Several debates have emerged across the literature about the conceptualisation of active ageing. The aim of this study is to develop a model of the construct that is focused on the individual, including different elements of people's lives that have the potential to be modified by intervention programs. Moreover, the paper examines the contributions of active ageing to life satisfaction, as well as the possible predictive role of coping styles on active ageing. For this purpose, a representative sample of 404 Galician (Spain) community-dwelling older adults (aged ≥60 years) were interviewed using a structured survey. The results demonstrate that the proposed model composed of two broad categories is valid. The model comprises status variables (related to physical, psychological, and social health) as well as different types of activities, called processual variables. This model is tested using partial least squares (PLS) regression. The findings show that active ageing is a fourth-order, formative construct. In addition, PLS analyses indicate that active ageing has a moderate and positive path on life satisfaction and that coping styles may predict active ageing. The discussion highlights the potential of active ageing as a relevant concept for people's lives, drawing out policy implications and suggestions for further research.

  8. Measuring, modeling and mapping ecosystem services in the Eastern Arc Mountains of Tanzania

    DEFF Research Database (Denmark)

    Fisher, B.; Turner, R. K.; Burgess, Neil David;

    2011-01-01

    sourced data, data-driven models, and socio-economic scenarios coupled with rule-based assumptions. Here we describe the construction of this spatial information and how it can help to shed light on the complex relationships between ecological and social systems. There are obvious difficulties...... in operationalizing this approach, but by highlighting those which we have encountered in our own case-study work, we have also been able to suggest some routes to overcoming these impediments....

  9. Computational Modeling of Microstructural-Evolution in AISI 1005 Steel During Gas Metal Arc Butt Welding

    Science.gov (United States)

    2013-05-01

    bainite and/or martensite 1212—Volume 22(5) May 2013 Journal of Materials Engineering and Performance The procedure described above is used to construct...phases/ microconstituents, primarily bainite , martensite and retained austenite. As it is generally difficult to make a clear distinction between...Widmanstatten ferrite and bainite , austenite to bainite phase transformation is not modeled explicitly, and it is simply lumped with the austenite to

  10. Customer satisfaction.

    Science.gov (United States)

    Vukmir, Rade B

    2006-01-01

    This paper seeks to present an analysis of the literature examining objective information concerning the subject of customer service, as it applies to the current medical practice. Hopefully, this information will be synthesized to generate a cogent approach to correlate customer service with quality. Articles were obtained by an English language search of MEDLINE from January 1976 to July 2005. This computerized search was supplemented with literature from the author's personal collection of peer-reviewed articles on customer service in a medical setting. This information was presented in a qualitative fashion. There is a significant lack of objective data correlating customer service objectives, patient satisfaction and quality of care. Patients present predominantly for the convenience of emergency department care. Specifics of satisfaction are directed to the timing, and amount of "caring". Demographic correlates including symptom presentation, practice style, location and physician issues directly impact on satisfaction. It is most helpful to develop a productive plan for the "difficult patient", emphasizing communication and empathy. Profiling of the customer satisfaction experience is best accomplished by examining the specifics of satisfaction, nature of the ED patient, demographic profile, symptom presentation and physician interventions emphasizing communication--especially with the difficult patient. The current emergency medicine customer service dilemmas are a complex interaction of both patient and physician factors specifically targeting both efficiency and patient satisfaction. Awareness of these issues particular to the emergency patient can help to maximize efficiency, minimize subsequent medicolegal risk and improve patient care if a tailored management plan is formulated.

  11. A three-model comparison of the relationship between quality, satisfaction and loyalty: an empirical study of the Chinese healthcare system

    Directory of Open Access Journals (Sweden)

    Lei Ping

    2012-11-01

    Full Text Available Abstract Background Previous research has addressed the relationship between customer satisfaction, perceived quality and customer loyalty intentions in consumer markets. In this study, we test and compare three theoretical models of the quality–satisfaction–loyalty relationship in the Chinese healthcare system. Methods This research focuses on hospital patients as participants in the process of healthcare procurement. Empirical data were obtained from six Chinese public hospitals in Shanghai. A total of 630 questionnaires were collected in two studies. Study 1 tested the research instruments, and Study 2 tested the three models. Confirmatory factor analysis was used to assess the scales’ construct validity by testing convergent and discriminant validity. A structural equation model (SEM specified the distinctions between each construct. A comparison of the three theoretical models was conducted via AMOS analysis. Results The results of the SEM demonstrate that quality and satisfaction are distinct concepts and that the first model (satisfaction mediates quality and loyalty is the most appropriate one in the context of the Chinese healthcare environment. Conclusions In this study, we test and compare three theoretical models of the quality–satisfaction–loyalty relationship in the Chinese healthcare system. Findings show that perceived quality improvement does not lead directly to customer loyalty. The strategy of using quality improvement to maintain patient loyalty depends on the level of patient satisfaction. This implies that the measurement of patient experiences should include topics of importance for patients’ satisfaction with health care services.

  12. A three-model comparison of the relationship between quality, satisfaction and loyalty: an empirical study of the Chinese healthcare system

    Science.gov (United States)

    2012-01-01

    Background Previous research has addressed the relationship between customer satisfaction, perceived quality and customer loyalty intentions in consumer markets. In this study, we test and compare three theoretical models of the quality–satisfaction–loyalty relationship in the Chinese healthcare system. Methods This research focuses on hospital patients as participants in the process of healthcare procurement. Empirical data were obtained from six Chinese public hospitals in Shanghai. A total of 630 questionnaires were collected in two studies. Study 1 tested the research instruments, and Study 2 tested the three models. Confirmatory factor analysis was used to assess the scales’ construct validity by testing convergent and discriminant validity. A structural equation model (SEM) specified the distinctions between each construct. A comparison of the three theoretical models was conducted via AMOS analysis. Results The results of the SEM demonstrate that quality and satisfaction are distinct concepts and that the first model (satisfaction mediates quality and loyalty) is the most appropriate one in the context of the Chinese healthcare environment. Conclusions In this study, we test and compare three theoretical models of the quality–satisfaction–loyalty relationship in the Chinese healthcare system. Findings show that perceived quality improvement does not lead directly to customer loyalty. The strategy of using quality improvement to maintain patient loyalty depends on the level of patient satisfaction. This implies that the measurement of patient experiences should include topics of importance for patients’ satisfaction with health care services. PMID:23198824

  13. Nursing students' experiences of and satisfaction with the clinical learning environment: the role of educational models in the simulation laboratory and in clinical practice.

    Science.gov (United States)

    Cremonini, Valeria; Ferri, Paola; Artioli, Giovanna; Sarli, Leopoldo; Piccioni, Enrico; Rubbi, Ivan

    2015-01-01

    Student satisfaction is an important element of the effectiveness of clinical placement, but there is little consensus in the literature as to the preferred model of clinical experience for undergraduate nursing students. The aim of this study was assess, for each academic year, students' perception of the roles of nurse teachers (NT) and clinical nurse supervisors (CNS) who perform tutoring in both apprenticeship and laboratories and to identify and evaluate students' satisfaction with the environment of clinical learning. This analytic cross-sectional study was conducted in a sample of 173 nursing students in the Northern Italy. The research instrument used is the Clinical learning environment, supervision and nurse teacher (CLES+T) evaluation scale. Data were statistically analysed. 94% of our sample answered questionnaires. Students expressed a higher level of satisfaction with their training experiences. The highest mean value was in the sub-dimension "Pedagogical atmosphere on the ward". Third year students expressed higher satisfaction levels in their relationship with the CNS and lower satisfaction levels in their relationship with the NT. This result may be due to the educational model that is adopted in the course, in which the simulation laboratory didactic activities of the third year are conducted by CNS, who also supervises experiences of clinical learning in the clinical practice. The main finding in this study was that the students' satisfaction with the supervisory relationship and the role of NT depend on how supervision in the clinical practice and in the simulation laboratory is organized.

  14. Coping strategies, satisfaction with life, and quality of life in Crohn's disease: A gender perspective using structural equation modeling analysis.

    Science.gov (United States)

    Sarid, O; Slonim-Nevo, V; Pereg, A; Friger, M; Sergienko, R; Schwartz, D; Greenberg, D; Shahar, I; Chernin, E; Vardi, H; Eidelman, L; Segal, A; Ben-Yakov, G; Gaspar, N; Munteanu, D; Rozental, A; Mushkalo, A; Dizengof, V; Abu-Freha, N; Fich, A; Odes, S

    2017-01-01

    To identify coping strategies and socio-demographics impacting satisfaction with life and quality of life in Crohn's disease (CD). 402 patients completed the Patient Harvey-Bradshaw Index, Brief COPE Inventory, Satisfaction with Life Scale (SWLS), Short Inflammatory Bowel Disease Questionnaire (SIBDQ). We performed structural equation modeling (SEM) of mediators of quality of life and satisfaction with life. The cohort comprised: men 39.3%, women 60.1%; P-HBI 4.75 and 5.74 (p = 0.01). In inactive CD (P-HBI≤4), both genders had SWLS score 23.8; men had SIBDQ score 57.4, women 52.6 (p = 0.001); women reported more use of emotion-focused, problem-focused and dysfunctional coping than men. In active CD, SWLS and SIBDQ scores were reduced, without gender differences; men and women used coping strategies equally. A SEM model (all patients) had a very good fit (X2(6) = 6.68, p = 0.351, X2/df = 1.114, SRMR = 0.045, RMSEA = 0.023, CFI = 0.965). In direct paths, economic status impacted SWLS (β = 0.39) and SIBDQ (β = 0.12), number of children impacted SWLS (β = 0.10), emotion-focused coping impacted SWLS (β = 0.11), dysfunctional coping impacted SWLS (β = -0.25). In an indirect path, economic status impacted dysfunctional coping (β = -0.26), dysfunctional coping impacted SIBDQ (β = -0.36). A model split by gender and disease activity showed that in active CD economic status impacted SIBDQ in men (β = 0.43) more than women (β = 0.26); emotional coping impacted SWLS in women (β = 0.36) more than men (β = 0.14). Gender differences in coping and the impacts of economic status and emotion-focused coping vary with activity of CD. Psychological treatment in the clinic setting might improve satisfaction with life and quality of life in CD patients.

  15. On construction technique of arc model at box girder web%箱梁外腹板圆弧模施工技术

    Institute of Scientific and Technical Information of China (English)

    梁见

    2012-01-01

    Combining with the arc model construction of the continuous box girder web at Yijiang Bridge at Wuhu, the paper undertakes the mould installation by adopting various method according to the parameters of the web arc and the field fact, and mainly introduces the technique, including the making and the consolidation of the box girder arc models with two different parameters, so as to have better reference and direction for the similar bridge construction.%结合芜湖弋江桥连续箱梁外腹板圆弧模施工技术,根据外腹板圆弧半径大小,结合现场实际情况,通过采取不同方法进行模板制安施工,详细介绍了两种不同圆弧半径的箱梁圆弧模板的制作、加固等技术,对同类型桥梁施工具有较强的借鉴和指导作用。

  16. Numerical Study on Arc Plasma Behavior During Arc Commutation Process in Direct Current Circuit Breaker

    Institute of Scientific and Technical Information of China (English)

    杨飞; 马瑞光; 吴翊; 孙昊; 纽春萍; 荣命哲

    2012-01-01

    This paper focuses on the numerical investigation of arc plasma behavior during arc commutation process in a medium-voltage direct current circuit breaker (DCCB) contact system. A three-dimensional magneto-hydrodynamic (MHD) model of air arc plasma in the contact system of a DCCB is developed, based on commercial software FLUENT. Coupled electromagnetic and gas dynamic interactions are considered as usual, and a thin layer of nonlinear electrical resistance elements is used to represent the voltage drop of plasma sheath and the formation of new arc root. The distributions of pressure, temperature, gas flow and current density of arc plasma in arc region are calculated. The simulation results indicate that the pressure distribution related to the contact system has a strong effect on the arc commutation process, arising from the change of electrical conductivity in the arc root region. In DCCB contact system, the pressure of arc root region will be concentrated and higher if the space above the moving contact is enclosed, which is not good for arc root commutation. However, when the region is opened, the pressure distribution would be lower and more evenly, which is favorable for the arc root commutation.

  17. Contact Angle Effects on Pore and Corner Arc Menisci in Polygonal Capillary Tubes Studied with the Pseudopotential Multiphase Lattice Boltzmann Model

    Directory of Open Access Journals (Sweden)

    Soyoun Son

    2016-02-01

    Full Text Available In porous media, pore geometry and wettability are determinant factors for capillary flow in drainage or imbibition. Pores are often considered as cylindrical tubes in analytical or computational studies. Such simplification prevents the capture of phenomena occurring in pore corners. Considering the corners of pores is crucial to realistically study capillary flow and to accurately estimate liquid distribution, degree of saturation and dynamic liquid behavior in pores and in porous media. In this study, capillary flow in polygonal tubes is studied with the Shan-Chen pseudopotential multiphase lattice Boltzmann model (LBM. The LB model is first validated through a contact angle test and a capillary intrusion test. Then capillary rise in square and triangular tubes is simulated and the pore meniscus height is investigated as a function of contact angle θ. Also, the occurrence of fluid in the tube corners, referred to as corner arc menisci, is studied in terms of curvature versus degree of saturation. In polygonal capillary tubes, the number of sides leads to a critical contact angle θc which is known as a key parameter for the existence of the two configurations. LBM succeeds in simulating the formation of a pore meniscus at θ > θc or the occurrence of corner arc menisci at θ < θc. The curvature of corner arc menisci is known to decrease with increasing saturation and decreasing contact angle as described by the Mayer and Stoewe-Princen (MS-P theory. We obtain simulation results that are in good qualitative and quantitative agreement with the analytical solutions in terms of height of pore meniscus versus contact angle and curvature of corner arc menisci versus saturation degree. LBM is a suitable and promising tool for a better understanding of the complicated phenomena of multiphase flow in porous media.

  18. Calculation Model of Satisfaction Degree Based on Intuitionistic Fuzzy Set%直觉模糊满意度计算模型

    Institute of Scientific and Technical Information of China (English)

    鱼先锋; 张洁

    2014-01-01

    满意度理论广泛应用于优化、控制、管理、决策、资源分配、任务调度等领域,但大多是针对具体时间段定义和计算满意度,缺乏一种体现满意度在时间上变化的计算模型。笔者基于直觉模糊集理论建立了一个普适的多级直觉模糊满意度计算模型;利用直觉模糊集算子有效地诱导出直觉模糊满意度。给出直觉模糊满意态模型,计算满意度在时间上的变化态势,用发展的视角评价对象,将定性与定量的方法结合起来进行满意态计算,使计算结果信息量更大、更加科学合理且自动化程度高。分析了该模型的计算复杂度,并结合实例计算了商洛学院计算机科学系网络方向教师教学满意态,结果显示该模型高效实用。%Satisfaction degree theory is widely used in optimization, system control , management, decision-making, resource allocation, task scheduling, and other fields. But most of them based on specific times to define and calculate satisfaction degree, which lack of a calculation model can incarnate satisfaction degree’s change on time. Based on intuition fuzzy set theory established an universal multilevel intuitionistic fuzzy satisfaction degree calculation model. Effectively lead intuitionistic fuzzy filter operator to intuitionistic fuzzy satisfaction degree. Given a satisfaction situation model based on intuitionistic fuzzy set. Calculate the change trend of satisfaction over time. Based on development vision evaluate object. combine qualitative and quantitative methods to calculate satisfaction situation, make the results more informative, scientific , reasonable and have a high automated situation . Analyzes the model’s calculation complexity, and combined with a practical example compute the intuitionistic fuzzy satisfaction situation of department of computer science of Shangluo university’s teaching satisfaction situation of it’s Network direction teacher

  19. Analysis of the Quality of Service and Student Satisfaction at the School of Economics, University of Cartagena, Using a Structural Equation Model

    Directory of Open Access Journals (Sweden)

    Juan Carlos Vergara Schmalbach

    2011-05-01

    Full Text Available Structural equation models have been widely used to analyze the quality of service in various organizations, demonstrating their adaptability and efficacy in determining the variables that affect customer satisfaction. This article proposes the use of a structural equation model to determine the quality of service offered by the different academic units of the School of Economics, University of Cartagena, combining Oh (1999 model with the original instrument of Parasuraman, Valarie, and Berry Zeithalm, presented in 1985. The result is a general diagnosis of the variables that exert the most influence on students’ satisfaction, and that motivate them to recommend their institution to others.

  20. The evolution of the magmatic arc of Southern Peru (200-60 Ma), Arequipa area: insight from geochemical modeling

    Science.gov (United States)

    Demouy, S.; Benoit, M.; De Saint Blanquat, M.; Brunet, P.

    2012-12-01

    Cordilleran-type batholiths are built by prolonged arc activity along continental margins and may provide detailed magmatic records of the subduction system evolution. The magmas produced in subduction context involve both mantellic and crustal end members and are subject to various petrological processes. The MASH zones (Hildreth and Moorbath, 1988), at the basis of the continental crust, are the best places for the genesis of such hybrid magmas. The various geochemical signatures observed in the plutonic rocks, may also be attributed to source heterogeneities or generated by subsequent petrological processes. This study has focused in the Arequipa section of the Coastal Batholith of Southern Peru (200-60 Ma), in an area extending over 80x40 km. Major and trace elements as well as Sr and Nd isotopic analyses were performed in a set of 100 samples ranging from gabbro to granite. The obtained data highlight the wide heterogeneity of the geochemical signatures that is not related to the classification of the rocks. In first step, Rb/Sr systematic was used to isolate a set of samples plotting along a Paleocene isochron and defining a cogenetic suite. This suite appears to have evolved by simple fractional crystallization. By using reverse modeling, the parameters controlling the fractional crystallization process were defined, as partition coefficients, initial concentrations and amount of fractional crystallization. The other magmatic suites display a wide range of isotopic and geochemical signatures. To explain this heterogeneity, a model involving competition between fractional crystallization and magma mixing into MASH zones was proposed. A large range of hybrid magma types is potentially generated during the maturation of the system, but this range tends to disappear as fractionation and mixing occurs. Finally the model predicts the genesis of a homogeneous reservoir created at depth, from which magmas may evolve only by fractional crystallization. Therefore

  1. The Confinement of Neptune's Ring Arcs

    Science.gov (United States)

    Porco, C.; Namouni, F.

    2002-09-01

    The stability of the narrow ring arcs of Neptune has been a puzzle since their discovery. First detected in 1984 from the Earth in stellar occultations and imaged by the Voyager spacecraft in 1989, the 5 arcs spanning approximately 40 deg in longitude are apparently confined against the rapid azimuthal and radial spreading that results from energy dissipation in inter-particle collisions. Voyager data were used to argue in favor of an arc confinement model (Goldreich et al. AJ 1986; Porco, Science 1991) that relies on both the vertical and mean angular motions of the nearby Neptunian moon, Galatea, to produce a pair of Lindblad (LR) and corotation inclination (CIR) resonances capable of trapping ring particles into a sequence of arcs. However, HST and Earth-based observations taken in 1998 (Dumas et al. Nature 1999; Sicardy et al. Nature 1999) indicate a revised arc mean angular motion which displaces the arcs away from the CIR, leaving their stability once again unexplained. In this presentation, we will discuss the workings of a hitherto neglected resonance which relies on Galatea's orbital eccentricity and which, together with the LR, is likely responsible for the angular confinement of the arcs. The action of this resonance, which operates through the precession of Galatea's eccentric orbit forced by the arcs' inertia, will allow a determination of the arcs' mass from future measurements of Galatea's eccentricity. We acknowledge the financial support of NASA's Planetary Geology and Geophysics Program and the Southwest Research Institute's Internal Research Grant program.

  2. Intercenter validation of a knowledge based model for automated planning of volumetric modulated arc therapy for prostate cancer. The experience of the German RapidPlan Consortium.

    Science.gov (United States)

    Schubert, Carolin; Waletzko, Oliver; Weiss, Christian; Voelzke, Dirk; Toperim, Sevda; Roeser, Arnd; Puccini, Silvia; Piroth, Marc; Mehrens, Christian; Kueter, Jan-Dirk; Hierholz, Kirsten; Gerull, Karsten; Fogliata, Antonella; Block, Andreas; Cozzi, Luca

    2017-01-01

    To evaluate the performance of a model-based optimisation process for volumetric modulated arc therapy applied to prostate cancer in a multicentric cooperative group. The RapidPlan (RP) knowledge-based engine was tested for the planning of Volumetric modulated arc therapy with RapidArc on prostate cancer patients. The study was conducted in the frame of the German RapidPlan Consortium (GRC). 43 patients from one institute of the GRC were used to build and train a RP model. This was further shared with all members of the GRC plus an external site from a different country to increase the heterogeneity of the patient's sampling. An in silico multicentric validation of the model was performed at planning level by comparing RP against reference plans optimized according to institutional procedures. A total of 60 patients from 7 institutes were used. On average, the automated RP based plans resulted fully consistent with the manually optimised set with a modest tendency to improvement in the medium-to-high dose region. A per-site stratification allowed to identify different patterns of performance of the model with some organs at risk resulting better spared with the manual or with the automated approach but in all cases the RP data fulfilled the clinical acceptability requirements. Discrepancies in the performance were due to different contouring protocols or to different emphasis put in the optimization of the manual cases. The multicentric validation demonstrated that it was possible to satisfactorily optimize with the knowledge based model patients from all participating centres. In the presence of possibly significant differences in the contouring protocols, the automated plans, though acceptable and fulfilling the benchmark goals, might benefit from further fine tuning of the constraints. The study demonstrates that, at least for the case of prostate cancer patients, it is possibile to share models among different clinical institutes in a cooperative framework.

  3. Contribution For Arc Temperature Affected By Current Increment Ratio At Peak Current In Pulsed Arc

    Science.gov (United States)

    Kano, Ryota; Mitubori, Hironori; Iwao, Toru

    2015-11-01

    Tungsten Inert Gas (TIG) Welding is one of the high quality welding. However, parameters of the pulsed arc welding are many and complicated. if the welding parameters are not appropriate, the welding pool shape becomes wide and shallow.the convection of driving force contributes to the welding pool shape. However, in the case of changing current waveform as the pulse high frequency TIG welding, the arc temperature does not follow the change of the current. Other result of the calculation, in particular, the arc temperature at the reaching time of peak current is based on these considerations. Thus, the accurate measurement of the temperature at the time is required. Therefore, the objective of this research is the elucidation of contribution for arc temperature affected by current increment ratio at peak current in pulsed arc. It should obtain a detail knowledge of the welding model in pulsed arc. The temperature in the case of increment of the peak current from the base current is measured by using spectroscopy. As a result, when the arc current increases from 100 A to 150 A at 120 ms, the transient response of the temperature didn't occur during increasing current. Thus, during the current rise, it has been verified by measuring. Therefore, the contribution for arc temperature affected by current increment ratio at peak current in pulsed arc was elucidated in order to obtain more knowledge of welding model of pulsed arc.

  4. GRAIL gravity field recovery using the short-arc integral equation technique: development of the latest Graz lunar gravity field model (GrazLGM)

    Science.gov (United States)

    Krauss, S.; Klinger, B.; Baur, O.; Mayr-Guerr, T.

    2015-10-01

    We present an updated version of the lunar gravity field model GrazLGM300a,b [1,2] based on intersatellite Ka-band ranging (KBR) observations collected by the GRAIL mission. We propose to exploit the ranging measurements by an integral equation approach using short orbital arcs [4].Compared to the predecessor model we increase the spectral resolution to degree and order 450 and refined the parameterization. Validation shows that the applied technique is well suited to recover the lunar gravity field.

  5. Customer satisfaction

    DEFF Research Database (Denmark)

    Eskildsen, Jacob Kjær; Kristensen, Kai

    2007-01-01

    & Westlund, 2003) as well as the structure of the framework (Eskildsen et al., 2004). We know however very little about how the structure of the individual markets with respect to, for instance, how the transparency of products and services affects customer satisfaction. The aim of this article is to analyze...... the effect of the transparency of products and services on customer satisfaction with respect to Danish mobile phone companies, banks and supermarkets from 2004 based on the authors' experiences from the various analyses conducted within the EPSI rating initiative....

  6. The Influence of Supervisor Multicultural Competence on the Supervisory Working Alliance, Supervisee Counseling Self-efficacy, and Supervisee Satisfaction with Supervision: A Mediation Model

    Science.gov (United States)

    Crockett, Stephanie; Hays, Danica G.

    2015-01-01

    We developed and tested a mediation model depicting relationships among supervisor multicultural competence, the supervisory working alliance, supervisee counseling self-efficacy, and supervisee satisfaction with supervision. Results of structural equation modeling showed that supervisor multicultural competence was related to the supervisory…

  7. Internal service quality by integrated approach Performance Control Matrix (PCM & Importance-Satisfaction Model (Studied in Yazd Regional Power Company

    Directory of Open Access Journals (Sweden)

    Saeid Peirow

    2016-02-01

    Full Text Available Today, the internal service quality as one of the most important factors affecting the recruitment and retention of staff is considered. The present study sought to examine the internal service quality of Yazd Regional Electric, finally, select appropriate strategies to improve the quality of local services in the organization. The application of this study is base on survey method.Data were collected from questionnaires to evaluate the 26 components of internal service quality of Yazd Regional Electric, has been used. Research community is the staff of the organisation.Also, the sample size, the initial questionnaire was distributed according to Cochran's formula is calculated.In order to analyze research data, the model is important - satisfaction and performance control matrix to identify those components that are used need to be improved.Also, in order to prioritize measures to improve employee satisfaction index is used. Data analysis using above tools show, 8 criteria are in improvment area. So, these criteria are prioritized with ESI.

  8. CyberArc: a non-coplanar-arc optimization algorithm for CyberKnife

    Science.gov (United States)

    Kearney, Vasant; Cheung, Joey P.; McGuinness, Christopher; Solberg, Timothy D.

    2017-07-01

    The goal of this study is to demonstrate the feasibility of a novel non-coplanar-arc optimization algorithm (CyberArc). This method aims to reduce the delivery time of conventional CyberKnife treatments by allowing for continuous beam delivery. CyberArc uses a 4 step optimization strategy, in which nodes, beams, and collimator sizes are determined, source trajectories are calculated, intermediate radiation models are generated, and final monitor units are calculated, for the continuous radiation source model. The dosimetric results as well as the time reduction factors for CyberArc are presented for 7 prostate and 2 brain cases. The dosimetric quality of the CyberArc plans are evaluated using conformity index, heterogeneity index, local confined normalized-mutual-information, and various clinically relevant dosimetric parameters. The results indicate that the CyberArc algorithm dramatically reduces the treatment time of CyberKnife plans while simultaneously preserving the dosimetric quality of the original plans.

  9. Perspectives on User Satisfaction Surveys.

    Science.gov (United States)

    Cullen, Rowena

    2001-01-01

    Discusses academic libraries, digital environments, increasing competition, the relationship between service quality and user satisfaction, and user surveys. Describes the SERVQUAL model that measures service quality and user satisfaction in academic libraries; considers gaps between user expectations and managers' perceptions of user…

  10. Assessing the twinning model in the Rwandan Human Resources for Health Program: goal setting, satisfaction and perceived skill transfer.

    Science.gov (United States)

    Ndenga, Esperance; Uwizeye, Glorieuse; Thomson, Dana R; Uwitonze, Eric; Mubiligi, Joel; Hedt-Gauthier, Bethany L; Wilkes, Michael; Binagwaho, Agnes

    2016-01-28

    Because of the shortage of health professionals, particularly in specialty areas, Rwanda initiated the Human Resources for Health (HRH) Program. In this program, faculty from United States teaching institutions (USF) "twin" with Rwandan Faculty (RF) to transfer skills. This paper assesses the twinning model, exploring USF and RF goal setting, satisfaction and perceptions of the effectiveness of skill transfer within the twinning model. All USF and RF in the HRH Program from August 2012-May 2014 were invited to participate. An 85-item questionnaire for USF and 71-item questionnaire for RF were administered via Survey Monkey in April and May 2014. Associations among primary outcomes were assessed and factors related with outcomes were modeled using logistic regression. Most RF and USF reported setting goals with their twin (89% and 71%, respectively). Half of RF (52%) reported effective skill transfer compared to 10% of USF. Only 38% of RF and 28% of USF reported being very satisfied with the twinning model. There was significant overlap in the three operational outcomes. For RF, the following factors were associated with outcomes: for effective skill transfer, being able to communicate in a common language and working at a nursing site outside of Kigali; and for satisfaction, 7+ years of professional experience and being part of a male RF-female USF twin pair. For USF, the following factors were associated with outcomes: for setting goals, prior teaching experience; and for satisfaction, experience in low resource settings for one month or less and feeling that HRH promotes a culture of respect. Twinning is the cornerstone of the HRH Program in Rwanda. These findings helped the HRH team identify key areas to improve the twinning experience including better recruitment and orientation of USF and RF, consideration of additional factors during the twinning process, provide language training support, facilitate joint twin activities and cross-cultural training and

  11. Collisional Simulations of Neptune's Ring Arcs

    Science.gov (United States)

    Hänninen, J.; Porco, C.

    1997-03-01

    The currently accepted model for Neptune arc confinement relies on the radial and azimuthal confining perturbations due to the nearby satellite, Galatea. This model calls for arc particle orbits exhibiting a negative eccentricity gradient and crossing at quadrature, a configuration that paradoxically leads to collisions energetic enough to disrupt arc confinement. We confirm with numerical collisional N-body simulations that the confinement mechanism relying on a 42:43 corotation-inclination resonance and a 42:43 outer Lindblad resonance with Galatea is indeed capable of confining a large population of 10-m-size and bigger particles over short time scales. Moreover, we find that an 84:86 outer vertical resonance, also due to Galatea, falling within 20 m of the arcs' radial position, effectively reduces the collision frequency and relative collisional velocities and consequently stabilizes the arcs over long time scales against the disruptive effects of collisions.

  12. MODEL APPLICATION MULTIVARIATE ANALYSIS OF STATISTICAL TECHNIQUES PCA AND HCA ASSESSMENT QUESTIONNAIRE ON CUSTOMER SATISFACTION: CASE STUDY IN A METALLURGICAL COMPANY OF METAL CONTAINERS

    Directory of Open Access Journals (Sweden)

    Cláudio Roberto Rosário

    2012-07-01

    Full Text Available The purpose of this research is to improve the practice on customer satisfaction analysis The article presents an analysis model to analyze the answers of a customer satisfaction evaluation in a systematic way with the aid of multivariate statistical techniques, specifically, exploratory analysis with PCA – Partial Components Analysis with HCA - Hierarchical Cluster Analysis. It was tried to evaluate the applicability of the model to be used by the issue company as a tool to assist itself on identifying the value chain perceived by the customer when applied the questionnaire of customer satisfaction. It was found with the assistance of multivariate statistical analysis that it was observed similar behavior among customers. It also allowed the company to conduct reviews on questions of the questionnaires, using analysis of the degree of correlation between the questions that was not a company’s practice before this research.

  13. Analysis of shortest path for vector data model based on ArcGIS%基于ArcGIS对矢量数据模型的最短路径分析

    Institute of Scientific and Technical Information of China (English)

    高晟

    2011-01-01

    In this paper, using the module of network analysis in ArcGis, problems of how to find different the shortest path in different circumstances discussed are given respectively.%利用ArcGIS中网络分析模块对最短路径问题分情况进行了探讨,分别给出了在不同情况下如何找到不同最短路径。

  14. A critical evaluation of the activity-regulated cytoskeleton-associated protein (Arc/Arg3.1)'s putative role in regulating dendritic plasticity, cognitive processes, and mood in animal models of depression.

    Science.gov (United States)

    Li, Yan; Pehrson, Alan L; Waller, Jessica A; Dale, Elena; Sanchez, Connie; Gulinello, Maria

    2015-01-01

    Major depressive disorder (MDD) is primarily conceptualized as a mood disorder but cognitive dysfunction is also prevalent, and may limit the daily function of MDD patients. Current theories on MDD highlight disturbances in dendritic plasticity in its pathophysiology, which could conceivably play a role in the production of both MDD-related mood and cognitive symptoms. This paper attempts to review the accumulated knowledge on the basic biology of the activity-regulated cytoskeleton-associated protein (Arc or Arg3.1), its effects on neural plasticity, and how these may be related to mood or cognitive dysfunction in animal models of MDD. On a cellular level, Arc plays an important role in modulating dendritic spine density and remodeling. Arc also has a close, bidirectional relationship with postsynaptic glutamate neurotransmission, since it is stimulated by multiple glutamatergic receptor mechanisms but also modulates α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor internalization. The effects on AMPA receptor trafficking are likely related to Arc's ability to modulate phenomena such as long-term potentiation, long-term depression, and synaptic scaling, each of which are important for maintaining proper cognitive function. Chronic stress models of MDD in animals show suppressed Arc expression in the frontal cortex but elevation in the amygdala. Interestingly, cognitive tasks depending on the frontal cortex are generally impaired by chronic stress, while those depending on the amygdala are enhanced, and antidepressant treatments stimulate cortical Arc expression with a timeline that is reminiscent of the treatment efficacy lag observed in the clinic or in preclinical models. However, pharmacological treatments that stimulate regional Arc expression do not universally improve relevant cognitive functions, and this highlights a need to further refine our understanding of Arc on a subcellular and network level.

  15. Nurses' Satisfaction With Using Nursing Information Systems From Technology Acceptance Model and Information Systems Success Model Perspectives: A Reductionist Approach.

    Science.gov (United States)

    Lin, Hsien-Cheng

    2017-02-01

    Nursing information systems can enhance nursing practice and the efficiency and quality of administrative affairs within the nursing department and thus have been widely considered for implementation. Close alignment of human-computer interaction can advance optimal clinical performance with the use of information systems. However, a lack of introduction of the concept of alignment between users' perceptions and technological functionality has caused dissatisfaction, as shown in the existing literature. This study provides insight into the alignment between nurses' perceptions and how technological functionality affects their satisfaction with Nursing Information System use through a reductionist perspective of alignment. This cross-sectional study collected data from 531 registered nurses in Taiwan. The results indicated that "perceived usefulness in system quality alignment," "perceived usefulness in information quality alignment," "perceived ease of use in system quality alignment," "perceived ease of use in information quality alignment," and "perceived ease of use in service quality alignment" have significantly affected nurses' satisfaction with Nursing Information System use. However, "perceived usefulness in service quality alignment" had no significant effect on nurses' satisfaction. This study also provides some meaningful implications for theoretical and practical aspects of design.

  16. Teaching “Chemistry in Our Lives” Unit in the 9th Grade Chemistry Course through Context-Based ARCS Instructional Model

    Directory of Open Access Journals (Sweden)

    Hülya KUTU

    2011-03-01

    Full Text Available The purpose of this study is to examine the usability of Context-based ARCS Instructional Model on secondary school chemistry teaching. For this purpose the effects of learning through Context-based ARCS Instructional Model on the retention of knowledge, students’ motivation and attitude towards chemistry have been investigated. An instrumental case study has been utilized as the research method to teach the unit “Chemistry in Our Lives” in the 9th grade high school chemistry curriculum through Context-based ARCS Instructional Model. The sample of the study is composed of totally 60 ninth grade students from two different classes in a high school in Erzurum. The sample has been selected by convenience sampling method. Data have been collected through “Attitude Towards Chemistry Scale [ATCS]”; “Instructional Materials Motivation Survey [IMMS]”, “Constructivist Learning Environment Survey [CLES]”, “Achievement Test [AT]” have been developed by the researchers and semi-structured interviews. The data for IMMS, CLES and AT have been analyzed through descriptive statistics and results were presented as mean, standard deviation and charts. ATCS test has been analyzed by dependent sample t-test to see whether there is a significant difference between pre and post-tests scores. Semi-structured interviews have been subjected to content analysis and the results are presented as descriptively. The results show that the method used has increased the retention of learning and students’ motivation but has not had a statistically significant impact on students’ attitudes towards chemistry. In addition, it has been seen that students perceive classroom milieu as a constructivist learning environment.

  17. Reconstruction of Late Cretaceous Magmatic Arcs in the Northern Andes: Single Versus Multiple Arc Systems

    Science.gov (United States)

    Cardona, A.; Jaramillo, J. S.; Leon, S.; Hincapie, S.; Mejia, D.; Patino, A. M.; Vanegas, J.; Zapata, S.; Valencia, V.; Jimenez, G.; Monsalve, G.

    2014-12-01

    Although magmatic rocks are major tracers of the geological evolution of convergent margins, pre-collisional events such as subduction erosion, collisional thrusting or late collisional strike slip segmentation may difficult the recognizing of multiple arc systems and therefore the existence of paleogeographic scenarios with multiple subduction systems. New field, U-Pb geochronology and whole rock geochemistry constraints from the northwestern segment of the Central Cordillera in the states of Antioquia and Caldas (Colombia) are used to understand the nature of the Late Cretaceous arc magmatism and evaluate the existence of single or multiple Pacific and Caribbean arc systems in the growth of the Northwestern Andes. The new results integrated with additional field and published information is used to suggest the existence of at least three different magmatic arcs. (1) An Eastern Continental arc built within a well defined Permian to Triassic continental crust that record a protracted 90-70 Ma magmatic evolution, (2) a 90-80 arc formed within attenuated continental crust and associated oceanic crust, (3) 90-88 Ma arc formed over a Late Cretaceous plateau crust. The eastern arcs were formed as part of double eastern vergent subduction system, where the most outboard arc represent a fringing arc formed over detached fragments of continental crust, whereas the easternmost continental arc growth by the closure an subduction of and older and broad Triassic to Early Jurassic back-arc ocean. Its closure also end up in ophiolite emplacement. The third allochtonous oceanic arc was formed over the Caribbean plateau crust and was accreted to the continental margin in the Late Cretaceous. Ongoing paleomagnetic, deformational, gravimetric and basin analysis will be integrate to test this model and understand the complex Late Cretaceous tectonic evolution of the Northern Andes.

  18. Providing Structural Model Variables Related to Job Satisfaction of Faculty Members of Shiraz University of Medical Sciences

    Directory of Open Access Journals (Sweden)

    GR Jamali

    2017-06-01

    Full Text Available Background and Objective: Understanding the factors that create job satisfaction can increase it and motivate faculty to engage in research. This study aims to research into these factors. Materials and Methods:214 faculty members working at SUMS were selected randomly. Data was collected and analyzed. Results: A meaningful relationship between the predictor variables (management support, subjective norm and job security and job satisfaction was found. The mediator (self efficacy also showed a significant correlation with the criterion variable (job satisfaction. The results showed that the predictive path analysis (management support, subjective norm and job security and significant indirect effect through the mediator (self efficacy with job satisfaction. Conclusion: Too many variables affect job satisfaction of faculty members, some of which were examined. The results of the analysis show that occupational safety and efficacy to the most effective use of the criterion variable of job satisfaction are significant.

  19. Multi-objective optimization of weld geometry in hybrid fiber laser-arc butt welding using Kriging model and NSGA-II

    Science.gov (United States)

    Gao, Zhongmei; Shao, Xinyu; Jiang, Ping; Wang, Chunming; Zhou, Qi; Cao, Longchao; Wang, Yilin

    2016-06-01

    An integrated multi-objective optimization approach combining Kriging model and non-dominated sorting genetic algorithm-II (NSGA-II) is proposed to predict and optimize weld geometry in hybrid fiber laser-arc welding on 316L stainless steel in this paper. A four-factor, five-level experiment using Taguchi L25 orthogonal array is conducted considering laser power ( P), welding current ( I), distance between laser and arc ( D) and traveling speed ( V). Kriging models are adopted to approximate the relationship between process parameters and weld geometry, namely depth of penetration (DP), bead width (BW) and bead reinforcement (BR). NSGA-II is used for multi-objective optimization taking the constructed Kriging models as objective functions and generates a set of optimal solutions with pareto-optimal front for outputs. Meanwhile, the main effects and the first-order interactions between process parameters are analyzed. Microstructure is also discussed. Verification experiments demonstrate that the optimum values obtained by the proposed integrated Kriging model and NSGA-II approach are in good agreement with experimental results.

  20. Simulation of the Effects of Several Factors on Arc Plasma Behavior in Low Voltage Circuit Breaker

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Taking into account the properties of the arc plasma and the electromagnetic, heat and radiative phenomena, commercial computational fluid dynamics software PHOENICS has been adapted and modified to develop the three-dimensional magneto-hydrodynamic (MHD)model of arc in a low voltage circuit breaker. The effects of the arc ignition location, venting size and gassing material on arc behavior have been investigated. The analysis of the results show that the arc velocity accelerates with the increase in the distance between arc ignition location and of the venting size, and the existence of the gassing material is beneficial to improving the arc voltage and reducing the arc temperature.