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Sample records for control analysis mca

  1. Dual function of the McaS small RNA in controlling biofilm formation : Genes Dev

    DEFF Research Database (Denmark)

    JØrgensen, Mikkel Girke; Thomason, Maureen K.

    2013-01-01

    Many bacterial small RNAs (sRNAs) regulate gene expression through base-pairing with mRNAs, and it has been assumed that these sRNAs act solely by this one mechanism. Here we report that the multicellular adhesive (McaS) sRNA of Escherichia coli uniquely acts by two different mechanisms: base-pairing and protein titration. Previous work established that McaS base pairs with the mRNAs encoding master transcription regulators of curli and flagella synthesis, respectively, resulting in down-regulation and up-regulation of these important cell surface structures. In this study, we demonstrate that McaS activates synthesis of the exopolysaccharide beta-1,6 N-acetyl-D-glucosamine (PGA) by binding the global RNA-binding protein CsrA, a negative regulator of pgaA translation. The McaS RNA bears at least two CsrA-binding sequences, and inactivation of these sites compromises CsrA binding, PGA regulation, and biofilm formation. Moreover, ectopic McaS expression leads to induction of two additional CsrA-repressed genes encoding diguanylate cyclases. Collectively, our study shows that McaS is a dual-function sRNA with roles in the two major post-transcriptional regulons controlled by the RNA-binding proteins Hfq and CsrA.

  2. Flow Injection Analysis and Liquid Chromatography for Multifunctional Chemical Analysis (MCA) Systems

    Science.gov (United States)

    Mayo, Ana V.; Loegel, Thomas N.; Bretz, Stacey Lowery; Danielson, Neil D.

    2013-01-01

    The large class sizes of first-year chemistry labs makes it challenging to provide students with hands-on access to instrumentation because the number of students typically far exceeds the number of research-grade instruments available to collect data. Multifunctional chemical analysis (MCA) systems provide a viable alternative for large-scale…

  3. VALIDATION OF NUCLEAR MATERIAL CONTROL AND ACCOUNTABILITY (MC&A) SYSTEM EFFECTIVENESS TOOL (MSET) AT IDAHO NATIONAL LABORATORY (INL)

    Energy Technology Data Exchange (ETDEWEB)

    Meppen, Bruce; Haga, Roger; Moedl, Kelley; Bean, Tom; Sanders, Jeff; Thom, Mary Alice

    2008-07-01

    A Nuclear Material Control and Accountability (MC&A) Functional Model has been developed to describe MC&A systems at facilities possessing Category I or II Special Nuclear Material (SNM). Emphasis is on achieving the objectives of 144 “Fundamental Elements” in key areas ranging from categorization of nuclear material to establishment of Material Balance Areas (MBAs), controlling access, performing quality measurements of inventories and transfers, timely reporting all activities, and detecting and investigating anomalies. An MC&A System Effectiveness Tool (MSET), including probabilistic risk assessment (PRA) technology for evaluating MC&A effectiveness and relative risk, has been developed to accompany the Functional Model. The functional model and MSET were introduced at the 48th annual International Nuclear Material Management (INMM) annual meeting in July, 20071,2. A survey/questionnaire is used to accumulate comprehensive data regarding the MC&A elements at a facility. Data is converted from the questionnaire to numerical values using the DELPHI method and exercises are conducted to evaluate the overall effectiveness of an MC&A system. In 2007 a peer review was conducted and a questionnaire was completed for a hypothetical facility and exercises were conducted. In the first quarter of 2008, a questionnaire was completed at Idaho National Laboratory (INL) and MSET exercises were conducted. The experience gained from conducting the MSET exercises at INL helped evaluate the completeness and consistency of the MC&A Functional Model, descriptions of fundamental elements of the MC&A Functional Model, relationship between the MC&A Functional Model and the MC&A PRA tool and usefulness of the MSET questionnaire data collection process.

  4. Design and implementation of an MCA card with double ADC for nuclear radiation analysis

    International Nuclear Information System (INIS)

    The rapid development of technology has triggered several interesting trends in nuclear instrumentation. In particular, the introduction of add-on cards that can serve as multichannel analyzer and offer adequate performance for most of the nuclear applications. The purpose of this thesis has been the design of a multichannel analyser inserted into microcomputer. The originality of this prototype MCA card with its innovative concept is the use of two analog digital converters or ADC of which the objective is to reduce to minima the lost of pulses during the acquisition and the signals processing. The first ADC works as the main converter (or master) and the second ADC the slave converter. The first ADC begins the first signals acquisition, while it will be busy for the processing, the second ADC continues the acquisition, thus there will be no lost pulses or precisely lost of pulses will be reduced to minima.The three main points for a multichannel analyzer will be studied such a the pile-up, the differential non-linearity or 'DNL' and the dead time. In the first part of this thesis the function of the MCA has been described and the different roles of the composed modules have been developed. In the second part, spectra analysis has been done with the MCA prototype as well the comparison with other MCAs such as MCAs S100, TISA, MCA35+, and the Inspector.

  5. Use of multi-criteria analysis (MCA for supporting community forest management

    Directory of Open Access Journals (Sweden)

    Khadka C

    2012-04-01

    Full Text Available Sustainable forest management usually involves the use of criteria and indicators (C&I allowing the monitoring, reporting and assessment of management activities at national, regional and forest management unit levels. Experiences of such concepts are scarce in Nepal, particularly with regard to the evaluation of management activities within a Multi-Criteria Analysis (MCA framework. In this contribution we describe how a MCA approach can be used to efficiently exploit information, knowledge, and preferences of stakeholders to address community forest management problems. Beside rating and ranking techniques, the Analytic Hierarchy Process (AHP is used to examine the importance of six criteria and forty-four indicators in a sustainable forest management context with a broad range of stakeholder groups. An evaluation of four management strategies in the Shree Gyneshwar community forest user group allows to demonstrate the relevance of changing priorities for different criteria. A passive adaptive management strategy focusing on a multiple use of natural resources and the introduction of production-oriented measures were identified as the most preferable option. The results of this study show that the multi-criteria analysis approach, and in particular the AHP, can assist decision-makers in efficiently evaluating management problems and generating ideas for the long-term strategic planning process of community forest management, even under complex socio-economic and ecological conditions. In that context, compromise solutions enjoy a higher possibility of being successful, taking into account the different views of stakeholder groups.

  6. Project evaluation, sustainability and accountability : combining cost-benefit analysis (CBA) and multi-criteria analysis (MCA)

    OpenAIRE

    Sijtsma, Frans J.,

    2006-01-01

    General abstract Decision-makers in governments and businesses must choose among different project alternatives which, in varying degrees, contribute to sustainability. Decision-makers also have to account for their choices to a large audience or a broad range of stakeholders. This thesis is about the positive and negative aspects of using the main judgement-oriented evaluation tools of Cost-Benefit Analysis (CBA) and Multi Criteria Analysis (MCA) together in the context of sustainability...

  7. Development of 8K-MCA Add-on based on FPGA technique with a control of VB6 software application under windows environment

    International Nuclear Information System (INIS)

    The multichannel analyzer is the heart of most experimental measurements. Today, it becomes popular and convenient. It can play a role of getting, processing data and easily interfacing to PC. Some standard-alone multichannel analysis systems can be replaced by Add-on MCA card. Especially, MCA card is necessary for application in nuclear physics research. The main aim of this sub-project is to focus on a design and construction of an 8K-MCA Add-on served for studying nuclear structure, for development of Gamma spectroscopy system, and for a production of low-cost electronics instruments as well. Some experimental results were obtained through the aforementioned card combining with other needed functional analog units. A multichannel data processing (MCD) circuit for nuclear spectroscopy application was developed using a field programmable gate arrays (FPGA) as the central processing element. In addition to the first role, A 13-bit analog-to-digital converter (8k ADC) circuit for nuclear spectroscopy application was also developed using a successive approximation ADC with a control of FPGA technology. The FPGA operates a program that builds the distributed functions of data collected by the ADC and then corrects the ADC differential non-linearity (DNL) via the sliding scale method. The acquisition routine runs in 3.7? s. the conversion time is approximated 2.2? s, and the integral non-linearity ? 0.14%. (author)

  8. Determination of Steady-State and Faulty Regimes of Overhead Lines by Means of Multiconductor Cell Analysis (MCA

    Directory of Open Access Journals (Sweden)

    Fabio Guglielmi

    2012-07-01

    Full Text Available Single-phase positive sequence modelling is often used in power systems when power flows and short circuit analysis are assessed. Of course, the use of single-phase positive sequence modelling assumes purely three-phase configurations and perfectly symmetrical ones so that single-phase modelling considers that all the phase conductors behave in the same way. When considering the physical reality of power networks, this assumption can be questionable and the behaviors of all the system conductors including the passive ones (earth wires for overhead lines, metallic screens and armours for cables and enclosures for gas insulated lines is completely unknown. Therefore, the present multiconductor cell analysis (MCA becomes necessary, since it allows one to achieve great precision results on the regimes of both phase conductors and passive conductors. MCA offers a powerful tool in order to validate (or less approximated and simplified computation methods. In particular, for single and double circuit overhead lines (OHLs, the current phasors induced in the earth wires and the ground return current alongside the line can be directly computed by MCA in steady state and faulty regimes. It is worth noting that, for faulty regimes, MCA allows also evaluating the approximation degree and validity field of screening factors k.

  9. The use of multi-criteria analysis (MCA) for evaluating feasible countermeasures after an accidental release of radioactivity

    International Nuclear Information System (INIS)

    The aim of this study is to establish a system that enables rational decisions to be taken for reducing (if necessary) the radiological risk to a population. These decisions normally concern whether a particular food product will be consumed or not, as well as wether it should be diverted for other uses. To evaluate the consequences of such actions, many different criteria have to be taken into account such as the radiological risk, nutritional and environmental criteria, current technical intervention levels, economic costs and public reaction. Under the guidance of the Institute of Automation and Operations Research at the University of Fribourg a Multi-Criteria-Analysis (MCA) approach, based on the most recent developments in decision theory, is being elaborated. MCA requires input from a suite of sub-models combined with basic input data. For the radiological impact model the German code ECOSYS will be adapted for Swiss conditions. Furthermore, input data on the effect of food processing on radionuclide content of foodstuffs and consumption habits are needed. MCA thus allows the consequences of different countermeasures to be assessed in relation to the different governing criteria. In order to allow efficient use of this technique it shall be implemented as a user friendly computerized decision support system. In this paper, an example of different countermeasures to reduce the dose from milk contaminated with I-131 resulting from a reactor accident is given

  10. The hardware design of digital MCA based on FPGA and USB

    International Nuclear Information System (INIS)

    An digital MCA (multi-channel analyzer) based on FPGA and USB2.0 technology is introduced. FPGA is the main processor. The nuclear signal through the amplifier circuit and AD converter is processed in FPGA. then the result is transferred to host computer through USB2.0 interface. The design achieves full digital control. Verilog HDL is used for FPGA programming and the interface software on the host computer is written in QT. The software on the host computer accomplishes the acquisition and display of the input signal and the MCA spectrum. The MCA pulse-amplitude analysis is achieved digitally in FPGA. (authors)

  11. Nonlinear functional connectivity network recovery in the human brain with mutual connectivity analysis (MCA): convergent cross-mapping and non-metric clustering

    Science.gov (United States)

    Wismüller, Axel; Abidin, Anas Z.; D'Souza, Adora M.; Wang, Xixi; Hobbs, Susan K.; Leistritz, Lutz; Nagarajan, Mahesh B.

    2015-03-01

    We explore a computational framework for functional connectivity analysis in resting-state functional MRI (fMRI) data acquired from the human brain for recovering the underlying network structure and understanding causality between network components. Termed mutual connectivity analysis (MCA), this framework involves two steps, the first of which is to evaluate the pair-wise cross-prediction performance between fMRI pixel time series within the brain. In a second step, the underlying network structure is subsequently recovered from the affinity matrix using non-metric network clustering approaches, such as the so-called Louvain method. Finally, we use convergent cross-mapping (CCM) to study causality between different network components. We demonstrate our MCA framework in the problem of recovering the motor cortex network associated with hand movement from resting state fMRI data. Results are compared with a ground truth of active motor cortex regions as identified by a task-based fMRI sequence involving a finger-tapping stimulation experiment. Our results regarding causation between regions of the motor cortex revealed a significant directional variability and were not readily interpretable in a consistent manner across subjects. However, our results on whole-slice fMRI analysis demonstrate that MCA-based model-free recovery of regions associated with the primary motor cortex and supplementary motor area are in close agreement with localization of similar regions achieved with a task-based fMRI acquisition. Thus, we conclude that our MCA methodology can extract and visualize valuable information concerning the underlying network structure between different regions of the brain in resting state fMRI.

  12. Assessment of Cerebrovascular Reserve before and after STA-MCA Bypass Surgery by SPECT and SPM Analysis

    Energy Technology Data Exchange (ETDEWEB)

    O, Joo-Hyun; Jang, Kyung-Sool; Yoo, Ie-Ryung [The Catholic University of Korea, Seoul (Korea, Republic of)] (and others)

    2007-12-15

    The purpose of this study was to objectively assess the efficacy of superficial temporal artery to middle cerebral artery (STA-MCA) bypass surgery using Technetium (Tc)-99m-ethyl cysteinate dimer (ECD) single photon emission computed tomography (SPECT) in patients who underwent STA-MCA bypass surgery. Brain perfusion SPECT images obtained at baseline and after the administration of acetazolamide were reconstructed using statistical parametric mapping in 23 patients, both before and after STA-MCA bypass surgery. The clinical outcomes of the surgery were also recorded and compared with the hemodynamic changes. A voxel with an uncorrected p-value of less than 0.001 was considered to be statistically significant. SPECT images of the territory supplied by the bypass graft showed an increase in both cerebrovascular flow and reserve at baseline, and the increase was significantly higher following the administration of acetazolamide. All patients showed improvement of clinical symptoms and increased blood flow to the left temporal, parietal, and frontal cortices as well as the thalamus. Brain SPECT effectively and objectively demonstrated the improved outcomes of STA-MCA bypass surgery, and thus may be used in postoperative analyses.

  13. Improved MCA-TV algorithm for interference hyperspectral image decomposition

    Science.gov (United States)

    Wen, Jia; Zhao, Junsuo; Cailing, Wang

    2015-12-01

    The technology of interference hyperspectral imaging, which can get the spectral and spatial information of the observed targets, is a very powerful technology in the field of remote sensing. Due to the special imaging principle, there are many position-fixed interference fringes in each frame of the interference hyperspectral image (IHI) data. This characteristic will affect the result of compressed sensing theory and traditional compression algorithms used on IHI data. According to this characteristic of the IHI data, morphological component analysis (MCA) is adopted to separate the interference fringes layers and the background layers of the LSMIS (Large Spatially Modulated Interference Spectral Image) data, and an improved MCA and Total Variation (TV) combined algorithm is proposed in this paper. An update mode of the threshold in traditional MCA is proposed, and the traditional TV algorithm is also improved according to the unidirectional characteristic of the interference fringes in IHI data. The experimental results prove that the proposed improved MCA-TV (IMT) algorithm can get better results than the traditional MCA, and also can meet the convergence conditions much faster than the traditional MCA.

  14. Estimating the robustness of composite CBA & MCA assessments by variation of criteria importance order

    DEFF Research Database (Denmark)

    Jensen, Anders Vestergaard; Barfod, Michael Bruhn; Leleur, Steen

    2009-01-01

    This paper discusses the concept of using rank variation concerning the stake-holder prioritising of importance criteria for exploring the sensitivity of criteria weights in multi-criteria analysis (MCA). Thereby the robustness of the MCA-based decision support can be tested. The analysis described is based on the fact that when using MCA as a decision-support tool, questions often arise about the weighting (or prioritising) of the included criteria. This part of the MCA is seen as the most subj...

  15. A Modeling and Simulation Approach to the Study of Metabolic Control Analysis

    Science.gov (United States)

    Rodriguez-Caso, Carlos; Sanchez-Jimenez, Francisca; Medina, Miguel Angel

    2002-01-01

    Metabolic control analysis has contributed to the rapid advance in our understanding of metabolic regulation. However, up to now this topic has not been covered properly in biochemistry courses. This work reports the development and implementation of a practical lesson on metabolic control analysis (MCA) using modeling and simulation. The…

  16. Ruptured infectious aneurysms of the distal MCA treated with trapping and STA-MCA bypass surgery.

    Science.gov (United States)

    Ota, Takahiro; Yoshino, Masanori; Horiba, Ayako; Yokoya, Sigeomi; Mizutani, Tohru

    2012-10-01

    We describe two patients with ruptured infectious aneurysms of the distal MCA, which were successfully treated by trapping and superficial temporal artery (STA)-middle cerebral artery (MCA) bypass surgery. Our patients had not experienced any ischemic attack postoperatively. Trapping and STA-MCA bypass surgery can be a useful option. PMID:22235906

  17. Remote effects in MCA territory ischemic infarction

    International Nuclear Information System (INIS)

    Using positron computed tomography (PCT) and the 15O labeled gas steady-state inhalation technique, regional cerebral blood flow (rCBF), cerebral oxygen consumption (rCMRO2), and oxygen extraction fraction (rOEF) can be measured quantitatively in humans. We quantitatively examined the relationship between focal ischemic lesions and intact regions as detected by X-ray CT in such areas as the territory of the contralateral middle cerebral artery (MCA), thalami, pons, and cerebellar hemispheres. Twenty-three PCT measurements in 13 patients with unilateral ischemic infarction in the MCA territory as detected by X-ray CT were performed. Remote effects from cerebral infarction of the MCA territory were observed in the contralateral MCA territory, ipsilateral thalamus, brainstem, and contralateral cerebellar hemisphere. Slight depression of rCBF and rCMRO2 was also observed in the contralateral thalamus and ipsilateral cerebral hemisphere; rOEF was normal in these areas. Though the depression of rCBF and rCMRO2 due to remote effects was detected in all periods, it was mildly observed 0 to 6 days after onset. The reduction of rCBF and rCMRO2 due to remote effects was less than the morphological as well as the functional threshold. The phenomenon is probably caused by neuronal deactivation, and the regions with depressed blood flow and metabolism may be in a ''resting'' state. (author)

  18. Improved MCA programmed by LabVIEW language

    International Nuclear Information System (INIS)

    PC based Multichannel analyser (MCA) is a popular instrument in the nuclear physics experiment. The authors introduce one kind of improved MCA which is programmed by LabVIEW language. This MCA has many advantages such as powerful data processing capability, more friendly interface and is easy to use. The basic principle of this MCA and the core technology of its software are described. Some results of experiment are presented too

  19. Evaluating and prioritizing technologies for adaptation to climate change. A hands on guidance to multi criteria analysis (MCA) and the identification and assessment of related criteria

    DEFF Research Database (Denmark)

    Trærup, Sara Lærke Meltofte; Bakkegaard, Riyong Kim

    2015-01-01

    The objective of this guidance is to guide consultants, decision makers and technical experts on how to facilitate discussions for prioritizing adaptation technologies, and to support the stakeholders in identifying appropriate criteria for this analysis.

  20. Metabolic control analysis of xylose catabolism in Aspergillus

    DEFF Research Database (Denmark)

    Prathumpai, Wai; Gabelgaard, J.B.

    2003-01-01

    A kinetic model for xylose catabolism in Aspergillus is proposed. From a thermodynamic analysis it was found that the intermediate xylitol will accumulate during xylose catabolism. Use of the kinetic model allowed metabolic control analysis (MCA) of the xylose catabolic pathway to be carried out, and flux control was shown to be dependent on the metabolite levels. Due to thermodynamic constraints, flux control may reside at the first step in the pathway, i.e., at the xylose reductase, even when the intracellular xylitol concentration is high. On the basis of the kinetic analysis, the general dogma specifying that flux control often resides at the step following an intermediate present at high concentrations was, therefore, shown not to hold. The intracellular xylitol concentration was measured in batch cultivations of two different strains of Aspergillus niger and two different strains of Aspergillus nidulans grown on media containing xylose, and a concentration up to 30 mM was found. Applying MCA showed thatthe first polyol dehydrogenase (XDH) in the catabolic pathway of xylose exerted the main flux control in the two strains of A. nidulans and A. niger NW324, but the flux control was exerted mainly at the first enzyme of the pathway (XR) of A. niger NW 296.

  1. Linear analysis near a steady-state of biochemical networks: control analysis, correlation metrics and circuit theory

    Directory of Open Access Journals (Sweden)

    Qian Hong

    2008-05-01

    Full Text Available Abstract Background: Several approaches, including metabolic control analysis (MCA, flux balance analysis (FBA, correlation metric construction (CMC, and biochemical circuit theory (BCT, have been developed for the quantitative analysis of complex biochemical networks. Here, we present a comprehensive theory of linear analysis for nonequilibrium steady-state (NESS biochemical reaction networks that unites these disparate approaches in a common mathematical framework and thermodynamic basis. Results: In this theory a number of relationships between key matrices are introduced: the matrix A obtained in the standard, linear-dynamic-stability analysis of the steady-state can be decomposed as A = SRT where R and S are directly related to the elasticity-coefficient matrix for the fluxes and chemical potentials in MCA, respectively; the control-coefficients for the fluxes and chemical potentials can be written in terms of RT BS and ST BS respectively where matrix B is the inverse of A; the matrix S is precisely the stoichiometric matrix in FBA; and the matrix eAt plays a central role in CMC. Conclusion: One key finding that emerges from this analysis is that the well-known summation theorems in MCA take different forms depending on whether metabolic steady-state is maintained by flux injection or concentration clamping. We demonstrate that if rate-limiting steps exist in a biochemical pathway, they are the steps with smallest biochemical conductances and largest flux control-coefficients. We hypothesize that biochemical networks for cellular signaling have a different strategy for minimizing energy waste and being efficient than do biochemical networks for biosynthesis. We also discuss the intimate relationship between MCA and biochemical systems analysis (BSA.

  2. Linear analysis near a steady-state of biochemical networks: Control analysis, correlation metrics and circuit theory

    Science.gov (United States)

    Heuett, William J; Beard, Daniel A; Qian, Hong

    2008-01-01

    Background Several approaches, including metabolic control analysis (MCA), flux balance analysis (FBA), correlation metric construction (CMC), and biochemical circuit theory (BCT), have been developed for the quantitative analysis of complex biochemical networks. Here, we present a comprehensive theory of linear analysis for nonequilibrium steady-state (NESS) biochemical reaction networks that unites these disparate approaches in a common mathematical framework and thermodynamic basis. Results In this theory a number of relationships between key matrices are introduced: the matrix A obtained in the standard, linear-dynamic-stability analysis of the steady-state can be decomposed as A = SRT where R and S are directly related to the elasticity-coefficient matrix for the fluxes and chemical potentials in MCA, respectively; the control-coefficients for the fluxes and chemical potentials can be written in terms of RTBS and STBS respectively where matrix B is the inverse of A; the matrix S is precisely the stoichiometric matrix in FBA; and the matrix eAt plays a central role in CMC. Conclusion One key finding that emerges from this analysis is that the well-known summation theorems in MCA take different forms depending on whether metabolic steady-state is maintained by flux injection or concentration clamping. We demonstrate that if rate-limiting steps exist in a biochemical pathway, they are the steps with smallest biochemical conductances and largest flux control-coefficients. We hypothesize that biochemical networks for cellular signaling have a different strategy for minimizing energy waste and being efficient than do biochemical networks for biosynthesis. We also discuss the intimate relationship between MCA and biochemical systems analysis (BSA). PMID:18482450

  3. A Simulation of Energy Storage System for Improving the Power System Stability with Grid-Connected PV using MCA Analysis and LabVIEW Tool

    Directory of Open Access Journals (Sweden)

    Jindrich Stuchly

    2015-01-01

    Full Text Available The large-scale penetration of distributed, Renewable power plants require transfers of large amounts of energy. This, in turn, puts a high strain on the energy delivery infrastructure. In particular, photovoltaic power plants supply energy with high intermittency, possibly affecting the stability of the grid by changing the voltage at the plant connection point. In this contribution, we summarize the main negative effects of selected and real-operated grid connected photovoltaic plant. Thereafter a review of suitable Energy storage systems to mitigate the negative effects has been carried out, compared and evaluated using Multi-criterion analysis. Based on this analysis, data collected at the plant and the grid, are used to design the energy storage systems to support connection of the plant to the grid. The cooperation of these systems is then analysed and evaluated using simulation tools created in LabVIEW for this purpose. The simulation results demonstrate the capability of energy storage system solutions to significantly reduce the negative feedback effects of Photovoltaic Power Plan to the low voltage grid.

  4. Geotail MCA Plasma Wave Investigation Data Analysis

    Science.gov (United States)

    Anderson, Roger R.

    1997-01-01

    The primary goals of the International Solar Terrestrial Physics/Global Geospace Science (ISTP/GGS) program are identifying, studying, and understanding the source, movement, and dissipation of plasma mass, momentum, and energy between the Sun and the Earth. The GEOTAIL spacecraft was built by the Japanese Institute of Space and Astronautical Science and has provided extensive measurements of entry, storage, acceleration, and transport in the geomagnetic tail and throughout the Earth's outer magnetosphere. GEOTAIL was launched on July 24, 1992, and began its scientific mission with eighteen extensions into the deep-tail region with apogees ranging from around 60 R(sub e) to more than 208 R(sub e) in the period up to late 1994. Due to the nature of the GEOTAIL trajectory which kept the spacecraft passing into the deep tail, GEOTAIL also made 'magnetopause skimming passes' which allowed measurements in the outer magnetosphere, magnetopause, magnetosheath, bow shock, and upstream solar wind regions as well as in the lobe, magnetosheath, boundary layers, and central plasma sheet regions of the tail. In late 1994, after spending nearly 30 months primarily traversing the deep tail region, GEOTAIL began its near-Earth phase. Perigee was reduced to 10 R(sub e) and apogee first to 50 R(sub e) and finally to 30 R(sub e) in early 1995. This orbit provides many more opportunities for GEOTAIL to explore the upstream solar wind, bow shock, magnetosheath, magnetopause, and outer magnetosphere as well as the near-Earth tail regions. The WIND spacecraft was launched on November 1, 1994 and the POLAR spacecraft was launched on February 24, 1996. These successful launches have dramatically increased the opportunities for GEOTAIL and the GGS spacecraft to be used to conduct the global research for which the ISTP program was designed. The measurement and study of plasma waves have made and will continue to make important contributions to reaching the ISTP/GGS goals and solving the significant problems of sun-earth connections. Plasma waves are involved in the energization and de-energization of plasma and energetic particles via numerous wave-particle interaction processes. Plasma waves in many instances are the source for the heating or cooling of the particles. They can cause particle precipitation by scattering particles into the loss cone. They move particles across boundaries in mass and energy dependent ways. Identifying the waves and the instabilities which produce them are thus crucial for understanding the plasma processes. Wave-particle interaction processes are especially important at various boundaries between the different regions of geospace including the bow shock, magnetopause, and interfaces in the geomagnetic tail between the magnetosheath, lobe, plasmasheet, boundary layers, and neutral sheet. In addition to identifying the characteristics of the instabilities and generation mechanisms encountered, plasma wave measurement are used in conjunction with other fields and particle measurements to identify the region of space the spacecraft is in or the boundary that is being crosed.

  5. Estimating the robustness of composite CBA & MCA assessments by variation of criteria importance order

    DEFF Research Database (Denmark)

    Jensen, Anders Vestergaard; Barfod, Michael Bruhn

    This paper discusses the concept of using rank variation concerning the stake-holder prioritising of importance criteria for exploring the sensitivity of criteria weights in multi-criteria analysis (MCA). Thereby the robustness of the MCA-based decision support can be tested. The analysis described is based on the fact that when using MCA as a decision-support tool, questions often arise about the weighting (or prioritising) of the included criteria. This part of the MCA is seen as the most subjective part and could give reasons for discussion among the decision makers or stakeholders. Furthermore, the relative weights can make a large difference in the resulting assessment of alternatives [1]. Therefore it is highly relevant to introduce a procedure for estimating the importance of criteria weights. This paper proposes a methodology for estimating the robustness of weights used in additive utility models. When assessing larger transport infrastructure projects often several non-monetised impacts could be relevant to include in the appraisal [2]. For many decision makers and stakeholders the task of setting the criteria weights for several criteria can be very difficult. To overcome this, the proposed method uses surrogate weights based on rankings of the criteria, by the use of Rank Order Distribution (ROD) weights [3]. This reduces the problem to assigning a rank order value for each criterion. A method for combining the MCA with the cost-benefit analysis (CBA) is applied as described by Salling et al. in [4]. This methodology, COSIMA, uses a calibration indicator which expresses the trade-off between the CBA and MCA part resulting in a total rate expressing the attractiveness of each alternative. However, it should be mentioned that the proposed procedure for estimating the importance of criteria weights is not limited to the ROD and COSIMA methods described above. The proposed framework is applied to the case of choosing the best corridor for a high speed railway in Sweden, between Linköping and Norrköping. This link is a part of a larger railway project called Ostlänken. 4 possible corridors have been indentified between the two cities and the preliminary studies have found 8 non-monetised criteria, which all are not included in the conducted CBA. The alternatives are compared to each other with respect to each criterion by using the REMBRANDT methodology. With 8 criteria there are 40340 (8!) possible combinations of ranking the criteria which have been made use of. The proposed method calculates all combinations and produces a set of rank variation graphs for each alternative and for different values of the trade-off indicator. This information is relatively easy to grasp for the decision-makers. The result is compared with the results from a conducted decision conference about the railway link. During the decision conference the different stakeholder preferences were unveiled by the participants who had to assign weights. The proposed method also introduces a more constrained approach. In this approach the stakeholders/decision makers have the possibility to set up some constraint to the decision problem. This could for example be that criterion XX cannot assume a rank lower than 3 or criterion XX always have to be ranked higher than criterion YY. This would mean that the outcome of the method is a subset of the total solution space. The paper finishes up with a discussion and considerations about how to present the results. The question whether to present a single decision criterion, such as the benefit-cost rate or the net present value, or instead to present graphs showing the robustness of the decision analysis is discussed. Furthermore a perspective, for estimating the robustness of weights using other MCA methodologies (and weighting methods) than the proposed framework, is discussed.

  6. 32 CFR 644.417 - For MCA family housing.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true For MCA family housing. 644.417 Section 644.417... family housing. The Act of 1 September 1954, Pub. L. 765, 83rd Congress (68 Stat. 1119), as amended by... Construction-Army Family Housing at Military Installations and Facilities.”...

  7. Effect of STA-MCA bypass based on the motor activation SPECT

    Energy Technology Data Exchange (ETDEWEB)

    Kawaguchi, Shoichiro; Uranishi, Ryunosuke; Sakaki, Toshisuke; Imai, Teruhiko; Ohishi, Hajime [Nara Medical Univ., Kashihara (Japan)

    1999-07-01

    The effect of STA-MCA bypass for ischemic cerebrovascular diseases (CVDs) on pure motor function using motor activation SPECT was evaluated and analyzed, and this effect with the resting cerebral blood flow and reserved capacity was compared. Motor activation SPECT were carried out on 22 cases with STA-MCA bypass for symptomatic ischemic CVDs. All motors activation SPECT using the finger opposition task on the affected side were performed before bypass, at 1 month, and 3 months after the bypass. Visual inspection was used to determine whether the result of the motor activation SPECT was as negative or positive. The activated region was detected anatomically precisely by superimposing the SPECT on the MRI. Before this study, the same examination was performed on normal controls. In controls, 91% showed the activated area on the sensorimotor cortex after the finger opposition tasks. Before bypass, the resting SPECT revealed reduction of cerebral blood flow (CBF) on the affected side in all cases. All cases also showed a disturbed response to acetazolamide (ACZ). Nine cases were positive in the motor activation SPECT. One month after bypass, the resting CBF increased in 11 cases. Seven showed preoperative positive motor activation. Fifteen cases were positive in the motor activation SPECT. Three months after bypass, 20 cases showed improvement in the resting CBF, and 19 cases were positive in the motor activation SPECT. Ten cases were negative in the preoperative motor activation SPECT. At one month after surgery, ACZ activation SPECT was performed in 12 cases. Five showed improvement of the response to ACZ. At 3 months after surgery, 8 of 12 cases treated with ACZ activation SPECT showed improved response to ACZ. In most of the cases, improved response to ACZ could be seen after response to motor activation improved. STA-MCA bypass is useful not only for resting CBF but also for pure motor function based on motor activation SPECT. (K.H.)

  8. MCA Based Performance Evaluation of Project Selection

    CERN Document Server

    Bakshi, Tuli

    2011-01-01

    Multi-criteria decision support systems are used in various fields of human activities. In every alternative multi-criteria decision making problem can be represented by a set of properties or constraints. The properties can be qualitative & quantitative. For measurement of these properties, there are different unit, as well as there are different optimization techniques. Depending upon the desired goal, the normalization aims for obtaining reference scales of values of these properties. This paper deals with a new additive ratio assessment method. In order to make the appropriate decision and to make a proper comparison among the available alternatives Analytic Hierarchy Process (AHP) and ARAS have been used. The uses of AHP is for analysis the structure of the project selection problem and to assign the weights of the properties and the ARAS method is used to obtain the final ranking and select the best one among the projects. To illustrate the above mention methods survey data on the expansion of optic...

  9. MCA Based Performance Evaluation of Project Selection

    Directory of Open Access Journals (Sweden)

    Tuli Bakshi

    2011-04-01

    Full Text Available Multi-criteria decision support systems are used in various fields of human activities. In every alternativemulti-criteria decision making problem can be represented by a set of properties or constraints. Theproperties can be qualitative & quantitative. For measurement of these properties, there are differentunit, as well as there are different optimization techniques. Depending upon the desired goal, thenormalization aims for obtaining reference scales of values of these properties. This paper deals with anew additive ratio assessment method. In order to make the appropriate decision and to make a propercomparison among the available alternatives Analytic Hierarchy Process (AHP and ARAS have beenused. The uses of AHP is for analysis the structure of the project selection problem and to assign theweights of the properties and the ARAS method is used to obtain the final ranking and select the best oneamong the projects. To illustrate the above mention methods survey data on the expansion of optical fibrefor a telecommunication sector is used. The decision maker can also used different weight combination inthe decision making process according to the demand of the system.

  10. Identity of cofactor bound to mycothiol conjugate amidase (Mca) influenced by expression and purification conditions.

    Science.gov (United States)

    Kocabas, Evren; Liu, Hualan; Hernick, Marcy

    2015-08-01

    Mycothiol serves as the primary reducing agent in Mycobacterium species, and is also a cofactor for the detoxification of xenobiotics. Mycothiol conjugate amidase (Mca) is a metalloamidase that catalyzes the cleavage of MS-conjugates to form a mercapturic acid, which is excreted from the mycobacterium, and 1-D-myo-inosityl-2-amino-2-deoxy-?-D-glucopyranoside. Herein we report on the metal cofactor preferences of Mca from Mycobacterium smegmatis and Mycobacterium tuberculosis. Importantly, results from homology models of Mca from M. smegmatis and M. tuberculosis suggest that the metal binding site of Mca is identical to that of the closely related protein N-acetyl-1-D-myo-inosityl-2-amino-2-deoxy-?-D-glucopyranoside deacetylase (MshB). This finding is supported by results from zinc ion affinity measurements that indicate Mca and MshB have comparable K(D)(ZnII) values (~10-20 pM). Furthermore, results from pull-down experiments using Halo-Mca indicate that Mca purifies with (stoichiometric) Fe(2+) when purified under anaerobic conditions, and Zn(2+) when purified under aerobic conditions. Consequently, Mca is likely a Fe(2+)-dependent enzyme under physiological conditions; with Zn(2+)-Mca an experimental artifact that could become biologically relevant under oxidatively stressed conditions. Importantly, these findings suggest that efforts towards the design of Mca inhibitors should include targeting the Fe(2+) form of the enzyme. PMID:26044118

  11. MCaVoH: A toolkit for mining, classification and visualization of human microbiota.

    Science.gov (United States)

    Nisar, Maryum; Noureen, Nighat; Fazal, Sahar; Qadir, Muhammad Abdul

    2015-10-01

    Human body is the home for a large number of microbes. The complexity of enterotype depends on the body site. Microbial communities in various samples from different regions are being classified on the basis of 16S rRNA gene sequences. With the improvement in sequencing technologies various computational methods have been used for the analysis of microbiome data. Despite several available machine learning techniques there is no single platform available which could provide several techniques for clustering, multiclass classification, comparative analysis and the most significantly the identification of the subgroups present within larger groups of human microbial communities. We present a tool named MCaVoH for this purpose which performs clustering and classification of 16S rRNA sequence data and highlight various groups. Our tool has an added facility of biclustering which produces local group of communities present within larger groups (clusters). The core objective of our work was to identify the interaction between various bacterial species along with monitoring the composition and variations in microbial communities. MCaVoH also evaluates the performance and efficiency of different techniques using comparative analysis. The results are visualized through different plots and graphs. We implemented our tool in MATLAB. We tested our tool on several real and simulated 16S rRNA data sets and it outperforms several existing methods. Our tool provides a single platform for using multiple clustering, classification algorithms, local community identification along with their comparison which has not been done so far. Tool is available at https://sourceforge.net/projects/mcavoh/. PMID:26193336

  12. Clipping of bilateral MCA aneurysms and a coiled ACOM aneurysm through a modified lateral supraorbital craniotomy.

    Science.gov (United States)

    Hage, Ziad A; Charbel, Fady T

    2015-01-01

    We showcase the microsurgical clipping of a left middle cerebral artery (MCA) aneurysm-(B) done through a modified right lateral supraorbital craniotomy, as well as clipping of a previously coiled anterior communicating (ACOM) artery aneurysm-(C) and a bilobed right MCA aneurysm-(A). Splitting of the right sylvian fissure is initially performed following which a subfrontal approach is used to expose and dissect the contralateral sylvian fissure. The left MCA aneurysm is identified and clipped. The ACOM aneurysm is then clipped following multiple clip repositioning based on flow measurements. The right MCA aneurysm is then identified and each lobe is clipped separately. The first picture showcased in this video is a side to side right and left ICA injection in AP projection. In this picture, (A) points to the bilobed right MCA aneurysm, (B) to the left middle cerebral artery (MCA) aneurysm, and (C) to the previously coiled anterior communicating (ACOM) artery aneurysm. The red dotted line shows that both MCA aneurysms lie within the same plane which makes it easier to clip both of them, through one small craniotomy. The video can be found here: http://youtu.be/4cQC7nHsL5I . PMID:25554841

  13. Process analysis and optimal control

    International Nuclear Information System (INIS)

    The presented publication should considered to be an introduction into some problems of process analysis and optimal control with respect to complex systems. An essential aspect of the work is to present this matter with the view of using microcomputers. The publication contains chapters on some mathematical and theoretical terms, real time regime, process analysis, optimal control, and control of complex systems. (author)

  14. In-house development of an FPGA-based MCA8K for gamma-ray spectrometer.

    Science.gov (United States)

    Lanh, Dang; Son, Pham Ngoc; Son, Nguyen An

    2014-01-01

    The objective of this work is domestic development of electronics instruments. It used for measuring ionization radiation and practical training at Nuclear Research Institute (NRI), Dalat, Vietnam. The aim of this work is to study and develop a novel MCA8k for Gamma-ray spectrometer concerning experimental nuclear physics. An approach for design and construction of the aforementioned instrument is to apply logic integrating techniques via Field Programmable Gate Arrays (FPGA) under Max?+?PlusII, Altera. The instrument allows interfacing to PC with self-developed application software. Scientific significance of this work is partly to contribute to opening a research direction in the field of nuclear electronics science for design and construction of radiation measurement instruments with the advanced IC technology in Vietnam. Practical significance of this work is partly to contribute to enhancement of capabilities in developing radiation measurement instruments for experimental research as well as practical training in nuclear physics. The advantages of FPGA: overcoming ballistic deficit, decrement of serial and parallel noise, flexible in programming, control of the system by software without an interfere of hardware. The disadvantages of FPGA: requirement of good knowledge of VHDL and professional tools for development of a expected project. A new electronics module of MCA8k has been achieved. Some main results obtained from the experimental testing are as follows: differential nonlinearity (DNL) of FPGA-MCA8k approximately 1.27%, integral nonlinearity (INL) = 0.607%, time conversion???2.2 ?s, deadtime (DT) is 0.75%. Data Acquisition Program MCANRI written in VC (+ +)6.0, self-executed under Windows XP environment. PMID:25485201

  15. Unilateral Moyamoya Phenomenon Due to MCA Occlusion in a Child Presenting with Intracerebral Hemorrhage

    OpenAIRE

    Srikanth, S. G.; Nagarajan, K.; Chandrashekar, H.S.; Vasudev, M.K.; Pillai, Shibu V.

    2006-01-01

    Spontaneous middle cerebral artery (MCA) occlusion leading to moyamoya phenomenon is different from classical moyamoya disease. Previous studies have reported such phenomena in adults with ischemic lesions, except for a solitary case in a child. We report a case of a ten-year old girl who presented with a deep intracerebral hematoma and a normal ipsilateral middle cerebral artery on initial evaluation by CT. Subsequently, on follow-up angiography, the ipsilateral MCA was occluded with evidenc...

  16. Myoendothelial Gap Junction Frequency does not Account for Sex Differences in EDHF Responses in Rat MCA

    OpenAIRE

    Sokoya, Elke M.; Burns, Alan R.; Marrelli, Sean P; Chen, Jie

    2007-01-01

    Previous findings from our laboratory have shown that dilations to endothelium-derived hyperpolarizing factor (EDHF) in rat middle cerebral artery (MCA) are less in females compared to males. Myoendothelial gap junctions (MEGJs) appear to mediate the transfer of hyperpolarization between endothelium and smooth muscle in males. In the present study we hypothesized that MEGJs are the site along the EDHF pathway which is compromised in female rat MCA.

  17. Applications of a portable MCA in nuclear safeguards

    Energy Technology Data Exchange (ETDEWEB)

    Halbig, J.K.; Klosterbuer, S.F.; Cameron, R.A.

    1985-01-01

    The DSD-2056-4K portable multi-channel analyzer (PMCA) is a standard tool used in both international and domestic safeguards. This tool and the built-in user programs have been field proven. For applications where the manpower to program built-in programs is not available, programs in external computers can control the PMCA. A set of general purpose setup and analysis subroutines have been written in BASIC to be used directly or as a guide in the external applications. While safeguards and the nuclear industry are just beginning to make use of the present PMCA, we are looking into ways of making it easier to write internal programs for the PMCA and into replacing its current 8-bit processor with a 16-bit processor to give it the capability to do very involved analysis such as peak fitting and detailed plutonium isotopic analysis. 8 refs., 3 figs.

  18. Linking least-cost energy system costs models with MCA: An assessment of the EU renewable energy targets and supporting policies

    Energy Technology Data Exchange (ETDEWEB)

    Oikonomou, V., E-mail: vlasis@jiqweb.or [Joint Implementation Network, Laan Corpus den Hoorn, 300, Groningen (Netherlands); Flamos, A., E-mail: aflamos@unipi.g [Department of Industrial Management and Technology, University of Piraeus, 80 Karaoli and Dimitriou str., 18534 Piraeus (Greece); Gargiulo, M., E-mail: Maurizio.gargiulo@e4sma.co [Energy Engineering Economic Environment Systems Modelling and Analysis S.r.L (34SMA), Turin (Italy); Giannakidis, G., E-mail: ggian@cres.g [Energy Systems Analysis Laboratory, Centre for Renewable Energy Sources and Savings, 19th Km Marathonos Ave. 19009 Pikermi, Attiki (Greece); Kanudia, A., E-mail: amit@kanors.co [Kanors, Vasundhra Enclave, Delhi (India); Spijker, E. [Joint Implementation Network, Laan Corpus den Hoorn, 300, Groningen (Netherlands); Grafakos, S., E-mail: s.grafakos@ihs.n [Dutch Research Institute For Transitions (Drift) and Institute for Housing and Urban Development Studies (IHS), Erasmus University Rotterdam, BurgemeesterOudlaan 50, P.O. Box 1935, 3000 BX, Rotterdam (Netherlands)

    2011-05-15

    There are several technoeconomic modeling approaches that provide quantitative results such as costs and the level of achievement of certain renewable energy (RE) policy targets. These approaches often do not consider other important factors for policy implementation (such as socio-political aspects and stakeholders' preferences). Recent multicriteria analysis (MCA) approaches attempt to integrate these multiple aspects in decision making process. In this respect, aim of this paper is to combine technoeconomic modeling and MCA approaches in a general analytical framework incorporating multiple aspects. Each method in an RE policy interaction problem can feed in the necessary policy information for the subsequent steps of an ex-ante and an ex-post assessment in a decision tree, starting from recognizing the need for implementing a new policy in parallel to the incumbent ones, assessing the actual policy costs and finally identifying the social acceptability of these RE policies.

  19. Diskursanalyse af fortællinger i praksis : levende fortællinger, små fortællinger og MCA.

    DEFF Research Database (Denmark)

    Bager, Ann Starbæk; Raudaskoski, Pirkko Liisa

    2016-01-01

    I nærværende kapitel præsenteres tre tilgange til analyse af fortællinger i praksis (storytelling): levende fortællinger (oversat fra living stories), positioneringsteori og små fortællinger (oversat fra small stories) og membership categorization analysis (MCA). Fælles for de tre perspektiver er deres opgør med traditionelle bibliografiske tilgange til narrativitet, der ofte analytisk efterfølger kanoniske, lineære og kohærente fortællinger med et klart plot. I modsætning hertil er de tre tilgange sensitive overfor hvordan de ’små diskursive aspekter’ af fortællende handlinger, som fx ambivalenser, brud og konflikter kan analyseres i forskellige praksisser. Særligt for kapitlet er, at vi zoomer ind på de tre tilganges potentialer til diskursanalyse af interaktion med specifikt fokus på interviewsituationer. Vi diskuterer løbende ligheder og forskelle og reflekterer over, hvorledes de tre tilgange fordrer varierende analytiske detaljegrader, spændende fra et mere overordnet organisatorisk perspektiv til næranalyse af interaktionelle fortællende praksisser. Deraf følger naturligt forskelle i typer af data og behandlingen heraf, hvilket der reflekteres over i kapitlets analytiske eksempler og diskussioner. En vigtig pointe med kapitlet er, at de tre tilgange bidrager med forskellige dimensioner til at forstå og analysere situerede fortællende praksisser, der kan stå hver for sig men også med fordel kan forenes i en samlet analysestrategi.

  20. Construction of a reasonable multi channel analyzer (MCA) with an educational FPGA board

    International Nuclear Information System (INIS)

    In resent years, the performances of new electronic devices, for example FPGA or so on, have been improved, and these devices become more cost-effective ones year by year. Moreover, prices of personal computers have become less expensive, and the programming environment on PC becomes much user-friendly and easy to operate in this decimal year. These advancements have possibilities to provide a great help for self-constructions of radiation measurement equipments, which needed huge cost and work to construct in the past. Then, I tried to construct a reasonable Mulch Channel Analyzer (MCA) with an educational FPGA board named EDX-005 (HuMANDATA ltd.), and conduct test measurements of the MCA. The MCA was constructed in a short period, and its cost was just under 50 thousands yen. The MCA normally works at 200 [cps/ch] count rate with a NaI(Tl) scintillation counter. The description of the MCA and some points of self-constructions of radiation measurement equipments are provided in this paper. (author)

  1. MCA Center of Excellence Through Benchmarking and INMM Involvement - Key Tools for Change

    Energy Technology Data Exchange (ETDEWEB)

    JAY, JEFFERY

    2005-10-07

    Nuclear Materials Management Department, a BWXT-corporate partner with Westinghouse Savannah River Company, has established a vision for positioning the organization as a Global Center of Excellence for Strategic Materials Management. NMM's Road to Excellence results from a changing business environment where flexibility and adaptability have become key demands from the Department of Energy customer. Flexibility and adaptability are integral components of the department's MC&A Center of Excellence philosophy in the pursuit of improvement technologies that meet domestic and international safeguards requirements. The customer challenge has put the organization in the forefront of change where benchmarking with other MC&A programs, applying human performance technologies and leveraging INMM leadership and participation opportunities are key ingredients to influencing improvements and changes in existing MC&A standards, policies and practices. The paper challenges MC&A professionals, MC&A program owners and organizational leaders to engage in the debate of new ideas, partnering arrangements and timely deployment of technologies (human performance and technical-based applications) to exponentially improve safeguards programs. Research and development efforts in support of safeguards improvements need to seriously consider deployment to field practitioners within a 2-3 year time frame from inception. INMM plays a crucial role in accelerating such opportunities and establishing improved performance standards above our normal governmental and organizational bureaucracies.

  2. Serodiagnosis of leptospirosis in China by the one-point MCA method.

    OpenAIRE

    Arimitsu, Y; Matuhasi, T; Kobayashi, S.; Sato, T; Cui, J.J.

    1987-01-01

    The one-point MCA method is very simple to perform and useful as a screening test in diagnosing leptospirosis in routine clinical laboratories. The kit, sensitized with six serovars occurring in Japan, was also useful in detecting serum antibodies of patients with leptospirosis in China.

  3. An unexpected evolution of symptomatic mild middle cerebral artery (MCA stenosis: asymptomatic occlusion

    Directory of Open Access Journals (Sweden)

    Malferrari Giovanni

    2011-12-01

    Full Text Available Abstract Background The intracranial localization of large artery disease is recognized as the main cause of ischemic stroke in the world, considering all countries, although its global burden is widely underestimated. Indeed it has been reported more frequently in Asians and African-American people, but the finding of intracranial stenosis as a cause of ischemic stroke is relatively common also in Caucasians. The prognosis of patients with stroke due to intracranial steno-occlusion is strictly dependent on the time of recanalization. Moreover, the course of the vessel involvement is highly dynamic in both directions, improvement or worsening, although several data are derived from the atherosclerotic subtype, compared to other causes. Case description We report the clinical, neurosonological and neuroradiological findings of a young woman, who came to our Stroke Unit because of the abrupt onset of aphasia during her work. An urgent neurosonological examination showed a left M1 MCA stenosis, congruent with the presenting symptoms; magnetic resonance imaging confirmed this finding and identified an acute ischemic lesion on the left MCA territory. The past history of the patient was significant only for a hyperinsulinemic condition, treated with metformine, and a mild overweight. At this time a selective cerebral angiography was not performed because of the patient refusal and she was discharged on antiplatelet and lipid-lowering therapy, having failed to identify autoimmune or inflammatory diseases. Within 1 month, she went back to our attention because of the recurrence of aphasia, lasting about ten minutes. Neuroimaging findings were unchanged, but the patient accepted to undergo a selective cerebral angiography, which showed a mild left distal M1 MCA stenosis. During the follow-up the patient did not experienced any recurrence, but a routine neurosonological examination found an unexpected evolution of the known MCA stenosis, i.e. left M1 MCA occlusion. Neuroradiological imaging did not identify new lesions of the brain parenchyma and a repeated selective cerebral angiography confirmed the left M1 MCA occlusion. Conclusions Regardless of the role of metabolic and/or inflammatory factors on the aetiology of the intracranial stenosis in this case, the course of the vessel disease was unexpected and previously unreported in the literature at our knowledge.

  4. Performance Evaluation of Two Different Industrial Foam Filters with LiMCA II Data

    Science.gov (United States)

    Syvertsen, Martin; Bao, Sarina

    2015-04-01

    Plant-scale filtration experiments with molten aluminum have been carried out with two different types of 10 × 10 × 2 in, 30 ppi ceramic foam filters. The filters were produced in the same production line where the only difference was the composition of the ceramic slurry used for the filter production. The inclusion contents in the aluminum melt before and after the filters were measured with two constantly running liquid metal cleanliness analyzer (LiMCA) II units. Three methods for analyzing the recorded data are presented. A significant difference in the filtration performance as function of time was found when settling of inclusions in the melt was taken into account. Statistical treatment of the time dependent LiMCA II data was performed.

  5. NuSTAR ground calibration: The Rainwater Memorial Calibration Facility (RaMCaF)

    DEFF Research Database (Denmark)

    Brejnholt, Nicolai; Christensen, Finn Erland

    2011-01-01

    The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA Small Explorer mission that will carry the first focusing hard X-ray (5-80 keV ) telescope to orbit. The ground calibration of the three flight optics was carried out at the Rainwater Memorial Calibration Facility (RaMCaF) built for this purpose. In this article we present the facility and its use for the ground calibration of the three optics.

  6. Detection of methylation in promoter sequences by melting curve analysis-based semiquantitative real time PCR

    Directory of Open Access Journals (Sweden)

    Lázcoz Paula

    2008-02-01

    Full Text Available Abstract Background We present two melting curve analysis (MCA-based semiquantitative real time PCR techniques to detect the promoter methylation status of genes. The first, MCA-MSP, follows the same principle as standard MSP but it is performed in a real time thermalcycler with results being visualized in a melting curve. The second, MCA-Meth, uses a single pair of primers designed with no CpGs in its sequence. These primers amplify both unmethylated and methylated sequences. In clinical applications the MSP technique has revolutionized methylation detection by simplifying the analysis to a PCR-based protocol. MCA-analysis based techniques may be able to further improve and simplify methylation analyses by reducing starting DNA amounts, by introducing an all-in-one tube reaction and by eliminating a final gel stage for visualization of the result. The current study aimed at investigating the feasibility of both MCA-MSP and MCA-Meth in the analysis of promoter methylation, and at defining potential advantages and shortcomings in comparison to currently implemented techniques, i.e. bisulfite sequencing and standard MSP. Methods The promoters of the RASSF1A (3p21.3, BLU (3p21.3 and MGMT (10q26 genes were analyzed by MCA-MSP and MCA-Meth in 13 astrocytoma samples, 6 high grade glioma cell lines and 4 neuroblastoma cell lines. The data were compared with standard MSP and validated by bisulfite sequencing. Results Both, MCA-MSP and MCA-Meth, successfully determined promoter methylation. MCA-MSP provided information similar to standard MSP analyses. However the analysis was possible in a single tube and avoided the gel stage. MCA-Meth proved to be useful in samples with intermediate methylation status, reflected by a melting curve position shift in dependence on methylation extent. Conclusion We propose MCA-MSP and MCA-Meth as alternative or supplementary techniques to MSP or bisulfite sequencing.

  7. Induced hypertension for the treatment of acute MCA occlusion beyond the thrombolysis window: case report

    Directory of Open Access Journals (Sweden)

    Salonen Oili

    2006-12-01

    Full Text Available Abstract Background A minority of stroke patients is eligible for thrombolytic therapy. Small pilot case series have hinted that elevation of incident arterial blood pressure might be associated with a favorable prognosis either in acute or subacute stroke. However, these patients were not considered for thrombolytic therapy and were not followed – up systematically. We used pharmacologically induced hypertension in a stroke patient with middle cerebral artery (MCA occlusion ineligible for thrombolysis that was followed-up by radiological, clinical and functional outcome assessment. Case presentation A patient with acute embolic MCA occlusion producing a large, ischemic penumbra confirmed by perfusion CT was treated by induced hypertension with phenylephrine started within 4 h of admission. Increase in the mean arterial pressure by 20% led to a reduction of neurological deficit by 3 points on the National Institute of Stroke Scale. MRI and CT scans performed during phenylephrine infusion showed the presence of limited subcortical and cortical infarct changes that were clearly less extensive than the perfusion deficit in the brain perfusion CT at baseline, found in the absence of MCA patency. No complications due to induced hypertension therapy occurred. Moderate functional improvement up to modified Rankin scale 2 at follow up took place. Conclusion Induced hypertension in acute ischemic stroke seems clinically feasible and may be beneficial in selected normo- or hypotensive stroke patients not eligible for thrombolytic recanalization therapy.

  8. Endovascular Mechanical Thrombectomy of an Occluded Superior Division Branch of the Left MCA for Acute Cardioembolic Stroke

    International Nuclear Information System (INIS)

    Cardiac embolism accounts for a large proportion of ischemic stroke. Revascularization using systemic or intra-arterial thrombolysis is associated with increasing risks of cerebral hemorrhageas time passes from stroke onset. We report successful mechanicalthrombectomy from a distal branch of the middle cerebral artery (MCA)using a novel technique. A 72-year old man suffered an acute ischemic stroke from an echocardiographically proven ventricular thrombus due toa recent myocardial infarction. Intra-arterial administration of 4 mgrt-PA initiated at 5.7 hours post-ictus failed to recanalize an occluded superior division branch of the left MCA. At 6 hours,symptomatic embolic occlusion persisted. Mechanical extraction of the clot using an Attracter-18 device (Target Therapeutics, Freemont, CA) resulted in immediate recanalization of the MCA branch. Attracter-18 for acute occlusion of MCA branches may be considered in selected patients who fail conventional thrombolysis or are nearing closure of the therapeutic window for use of thrombolytic agents

  9. NATO-ASTEC-matrix-research environment, information sharing and MCA

    International Nuclear Information System (INIS)

    The successful implementations of the NATO-ASTECMATRIX project in Armenia are essential contribution into security, stability and solidarity among regional nations, by applying the best technical expertise to problem solving. Collaboration, networking and capacity-building are means used to accomplish these goals. A further aim is to promote the co-operation with new partners and the ASTEC are creating links between scientists and organizations in formerly separated communities, developing new strategy concentrating support on security related collaborative projects and finding answers to critical questions and a way of connecting nations. The NATO-ASTECMATRIX within Armenia leads to a network of high standards laboratories that will drastically improve the overview and the technical infrastructure for monitoring, accounting and control of CBRN materials in the Armenia. This new infrastructure will enhance the exchange of information on this vital issue via the IRIS. In follow-up phases, it will also help to better define the needs and requirements for a policy to enhance legal tools for the management of these materials, and for the creation of one or several agencies aiming at dealing with wastes or no longer useful materials containing CBRN components in Armenia

  10. Application Of The Digital Signal Processing Technique For The Design And Construction Of Gamma DSP-Based MCA 8K

    International Nuclear Information System (INIS)

    DSP is one of the most useful tools for development of nuclear electronics instruments. The method can be carried out by either a special digital signal processor or FPGA which is programmed through VHDL. In this case, Digital signal processing (DPS) is performed by VHDL code then programing into FPGA device. The aim of this project is to study on digital signal processing technique then application for design and construction of DSP-based MCA 8K. VHDL standards for VHSIC hardware description language. Due to VHDL, almost component such as low pass filter, high pass filter, math function module as adder/subtractor and multiplier, logic control, First In First Out, register, memory and Central processing unit needed for our design can be synthesized and implemented. The VHDL source design has been compiled and implemented by xilinx ISE 10.1 software toolkit and then used to configuration the Spartan XC3S400 device. The main Spartan 3 development board named Siphec XC3S400-TB is used for design of the project. An application software is written in LabVIEW 8.5. The firmware to control the USB interface and interface between FPGA and PC is design in Keil C51 compiler toolkit. (author)

  11. Pathway kinetics and metabolic control analysis of a high-yielding strain of Penicillium chrysogenum during fed-batch cultivations

    DEFF Research Database (Denmark)

    Pissarra, Pedro de N.; Nielsen, Jens Bredal

    1996-01-01

    A kinetic model representing the pathway for the biosynthesis of penicillin by P. chrysogenum has been developed. The model is capable of describing the flux through the biosynthetic pathway, and model simulations correspond well with measurements of intermediates and end products. One feature of the present model structure is that it assumes the kinetics of the enzyme isopenicillin N synthetase (IPNS) to be first order with respect to the dissolved oxygen concentration in the range of 0.070 to 0.18 mM (25% to 70% saturation with air). Thus, it indicates the importance that molecular oxygen has on the rate of the reaction catalyzed by this enzyme, and consequently as an enhancer of the specific rate of penicillin production. Using the kinetic model, metabolic control analysis (MCA) of the pathway was performed. The determined flux control coefficients suggested that, during the production phase, the flux is controlled by IPNS as this enzyme becomes saturated with tripeptide delta-(L-alpha-amino-adipyl)-L-cysteinyl-D-valine (LLD-ACV). In the simulations, oxygen was shown to be a bottleneck alleviator by stimulating the rate of IPNS which prevents the accumulation of LLD-ACV. As a consequence of this stimulation, the rate-controlling step was moved to another place in the pathway.

  12. Controllability analysis of decentralised linear controllers for polymeric fuel cells

    Energy Technology Data Exchange (ETDEWEB)

    Serra, Maria; Aguado, Joaquin; Ansede, Xavier; Riera, Jordi [Institut de Robotica i Informatica Industrial, Universitat Politecnica de Catalunya - Consejo Superior de Investigaciones Cientificas, C. Llorens i Artigas 4, 08028 Barcelona (Spain)

    2005-10-10

    This work deals with the control of polymeric fuel cells. It includes a linear analysis of the system at different operating points, the comparison and selection of different control structures, and the validation of the controlled system by simulation. The work is based on a complex non linear model which has been linearised at several operating points. The linear analysis tools used are the Morari resiliency index, the condition number, and the relative gain array. These techniques are employed to compare the controllability of the system with different control structures and at different operating conditions. According to the results, the most promising control structures are selected and their performance with PI based diagonal controllers is evaluated through simulations with the complete non linear model. The range of operability of the examined control structures is compared. Conclusions indicate good performance of several diagonal linear controllers. However, very few have a wide operability range. (author)

  13. Measurement Control Workshop Instructional Materials

    Energy Technology Data Exchange (ETDEWEB)

    Gibbs, Philip [Brookhaven National Lab. (BNL), Upton, NY (United States); Crawford, Cary [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); McGinnis, Brent [Pacific Northwest National Lab. (PNNL), Richland, WA (United States) and Insolves LLC

    2014-04-01

    A workshop to teach the essential elements of an effective nuclear materials control and accountability (MC&A) programs are outlined, along with the modes of Instruction, and the roles and responsibilities of participants in the workshop.

  14. Left pterional craniotomy for thrombectomy and clipping of ruptured left MCA giant aneurysm.

    Science.gov (United States)

    Couldwell, William T; Cutler, Aaron; Neil, Jayson A

    2015-07-01

    Giant aneurysms present a challenge to cerebrovascular surgeons on many fronts. These lesions have significant mass effect on surrounding tissues and are often partially thrombosed with thickened or calcified walls; these difficulties are amplified in cases of subarachnoid hemorrhage. The treatment of these lesions often requires debulking or resection of the aneurysm with or without trapping and bypassing the aneurysm segment. The case presented is of a man with a ruptured giant left middle cerebral artery (MCA) aneurysm presenting with seizure. The treatment of this giant aneurysm involves dissection, opening and internal evacuation including the use of ultrasonic aspiration, resection, and clipping. The patient was given aspirin preoperatively in preparation for possible superficial temporal artery-MCA or saphenous vein bypass if clipping was not possible. Vessel patency was evaluated using intraoperative Doppler and indocyanine green angiography. Intraoperative somatosensory and motor evoked potential monitoring is performed in all cases. Postoperatively, the patient was neurologically intact. At 1 year his modified Rankin Scale is 1, with his only symptom being intermittent headache. The video can be found here: http://youtu.be/8dimNdiIObE . PMID:26132607

  15. Rent control: a comparative analysis

    Scientific Electronic Library Online (English)

    S, Maass.

    Full Text Available Recent case law shows that vulnerable, previously disadvantaged private sector tenants are currently facing eviction orders - and consequential homelessness - on the basis that their leases have expired. In terms of the case law it is evident that once their leases have expired, these households do [...] not have access to alternative accommodation. In terms of the Constitution, this group of marginalised tenants have a constitutional right of access to adequate housing and a right to occupy land with legally secure tenure. The purpose of this article is to critically analyse a number of legislative interventions, and specifically rent control, that were imposed in various jurisdictions in order to provide strengthened tenure protection for tenants. The rationale for this analysis is to determine whether the current South African landlord-tenant regime is able to provide adequate tenure protection for vulnerable tenants and therefore in the process of transforming in line with the Constitution. The legal construction of rent control was adopted in pre-1994 South Africa, England and New York City to provide substantive tenure protection for tenants during housing shortages. These statutory interventions in the different private rental markets were justified on the basis that there was a general need to protect tenants against exploitation by landlords. However, the justification for the persistent imposition of rent control in New York City is different since it protects a minority group of financially weak tenants against homelessness. The English landlord-tenant regime highlights the importance of a well-structured social sector that can provide secure, long-term housing options for low-income households who are struggling to access the private rental sector. Additionally, the English rental housing framework shows that if the social sector is functioning as a "safety net" for low-income households, the private sector would be able to uphold deregulation. In light of these comparisons and the fact that the South African social sector is not functioning optimally yet, the question is whether the South African private sector is able to provide the required level of tenure protection for struggling tenants. Recent case law shows that tenants are at liberty to lodge unfair practice complaints with the Rental Housing Tribunals on the basis that the landlords' ground for termination of the lease constitutes an unfair practice. The Court defined an unfair practice as a practice that unreasonably prejudices the tenants' rights or interests. This judicial development signifies some transformation in the private sector since it allows the Tribunals to scrutinise landlords' reasons for termination of tenancies in light of tenants' personal and socioeconomic circumstances. The Tribunals are therefore empowered to weigh the interests of both parties and decide whether to confirm termination of the lease or set aside such termination. In light of this recent development, the Tribunals can provide strengthened tenure protection for destitute tenants on a case by case basis, which incorporates a flexible context-sensitive approach to the provision of secure housing rights in the landlord-tenant framework. This methodology is similar to the German approach. Even though this judicial development is welcomed, it raises some concerns with regard to landlords' property rights and specifically landlords' constitutional property rights since Tribunals are now at liberty to set aside contractually agreed grounds for termination of leases without any statutory guidance. The legislation fails to provide any information regarding legitimate grounds for termination, which might have to be rectified in future. The grounds listed in the rent control legislation should serve as a starting point to determine which grounds for termination of a lease should generally be upheld. However, German landlord-tenant law shows that a statutory ground for termination of a lease should not be imposed in an absolutist fashion but rather place a

  16. RENT CONTROL: A COMPARATIVE ANALYSIS

    Directory of Open Access Journals (Sweden)

    Sue-Mari Maass

    2012-11-01

    Full Text Available Recent case law shows that vulnerable, previously disadvantaged private sector tenants are currently facing eviction orders – and consequential homelessness – on the basis that their leases have expired. In terms of the case law it is evident that once their leases have expired, these households do not have access to alternative accommodation. In terms of the Constitution, this group of marginalised tenants have a constitutional right of access to adequate housing and a right to occupy land with legally secure tenure. The purpose of this article is to critically analyse a number of legislative interventions, and specifically rent control, that were imposed in various jurisdictions in order to provide strengthened tenure protection for tenants. The rationale for this analysis is to determine whether the current South African landlord-tenant regime is able to provide adequate tenure protection for vulnerable tenants and therefore in the process of transforming in line with the Constitution. The legal construction of rent control was adopted in pre-1994 South Africa, England and New York City to provide substantive tenure protection for tenants during housing shortages. These statutory interventions in the different private rental markets were justified on the basis that there was a general need to protect tenants against exploitation by landlords. However, the justification for the persistent imposition of rent control in New York City is different since it protects a minority group of financially weak tenants against homelessness. The English landlord-tenant regime highlights the importance of a well-structured social sector that can provide secure, long-term housing options for low-income households who are struggling to access the private rental sector. Additionally, the English rental housing framework shows that if the social sector is functioning as a "safety net" for low-income households, the private sector would be able to uphold deregulation. In light of these comparisons and the fact that the South African social sector is not functioning optimally yet, the question is whether the South African private sector is able to provide the required level of tenure protection for struggling tenants. Recent case law shows that tenants are at liberty to lodge unfair practice complaints with the Rental Housing Tribunals on the basis that the landlords' ground for termination of the lease constitutes an unfair practice. The Court defined an unfair practice as a practice that unreasonably prejudices the tenants' rights or interests. This judicial development signifies some transformation in the private sector since it allows the Tribunals to scrutinise landlords' reasons for termination of tenancies in light of tenants' personal and socio-economic circumstances. The Tribunals are therefore empowered to weigh the interests of both parties and decide whether to confirm termination of the lease or set aside such termination. In light of this recent development, the Tribunals can provide strengthened tenure protection for destitute tenants on a case by case basis, which incorporates a flexible context-sensitive approach to the provision of secure housing rights in the landlord-tenant framework. This methodology is similar to the German approach. Even though this judicial development is welcomed, it raises some concerns with regard to landlords' property rights and specifically landlords' constitutional property rights since Tribunals are now at liberty to set aside contractually agreed grounds for termination of leases without any statutory guidance. The legislation fails to provide any information regarding legitimate grounds for termination, which might have to be rectified in future. The grounds listed in the rent control legislation should serve as a starting point to determine which grounds for termination of a lease should generally be upheld. However, German landlord-tenant law shows that a statutory ground for termination of a lease should not be imposed in an absolutist fashion but rather place a

  17. The Foetal 'Mind' as a Reflection of its Inner Self: Evidence from Colour Doppler Ultrasound of Foetal MCA.

    Science.gov (United States)

    Kachewar, Sushil Ghanshyam; Gandage, Siddappa Gurubalappa

    2012-01-01

    The unborn healthy foetus is looked upon as a blessing by one and all. A plethora of thoughts arise in the brains of expectant parents. But what goes on in the brain of the yet unborn still remains a mystery. 'Foetal mind' is a reflection of functions of its organs of sense, an instrument of knowledge that may even be reduced to machine to demonstrate the effect of sense organs and brain contact. Testimony to this fact are the various waveform patterns obtained non-invasively from the foetal Middle Cerebral Artery (MCA) by using Colour Doppler Ultrasound. Our study, conducted for evaluating the foetal MCA in a rural obstetric population in Maharashtra, India, explains how the MCA - a major artery supplying foetal brain, can give abundant information about foetal heart and foetal stress. When only the foetal heart is stressed by the presence of arrhythmias or ectopic beats, these changes are manifest in the foetal MCA velocity waveform pattern as seen on Colour Doppler study. When the entire foetus is under stress, as in cases of intra uterine growth retardation (IUGR), changes again manifest in the foetal MCA velocity waveform pattern and are designated as the foetal Brain Sparing Effect. Thus scientific evaluation of foetal MCA waveform can objectively demonstrate that the overtly non-communicating foetal brain indeed remains an internal organ of sense and a vital instrument of knowledge to clarify the various effects of sense organs and brain contact. Although the brain parenchyma or cerebral metabolism has not been studied here, cerebral vessels serve as a window to cerebral metabolism, as auto regulatory function of brain leads to changes in haemodynamics of cerebral vessels. Also, like other vessels, MCA mirrors foetal distress and IUGR; but unlike other vessels, e.g. the umbilical or uterine artery, which show these changes in the form of reduction or even reversal of diastolic flow, MCA shows an increase in diastolic component due to brain sparing effect. The unique connection between physical changes in the foetal heart, brain and mental operations are thus critically clarified to some extent, and this helps untangle and comprehend the lattice of mental operations. Although this preliminary study has its limitations, it still carries forward the present corpus of knowledge on the strength of its evidential and critical enquiry and helps unravel the concept of foetal consciousness. PMID:22654385

  18. Quality control analysis at the hospital

    International Nuclear Information System (INIS)

    Quality control analysis is an integral part of quality assurance. In a system as with radiopharmaceuticals where part of the finishing of the product takes place at individual hospitals, the need for quality control analysis at the hospital can be discussed. Data are presented that stresses the importance of quality control by the manufacturer as a basis for limitation of such work at hospitals. A simplified programme is proposed

  19. Synthesis and luminescence properties of Ce{sup 3+} doped MWO{sub 4} (M=Ca, Sr and Ba) microcrystalline phosphors

    Energy Technology Data Exchange (ETDEWEB)

    Dabre, K.V. [Department of Physics, Arts, Commerce and Science College, Koradi, Nagpur (India); Dhoble, S.J., E-mail: sjdhoble@rediffmail.com [Department of Physics, R.T.M. Nagpur University, Nagpur 440033 (India); Lochab, Jyoti [Radiotherapy Department, Safdarjung Hospital, New Delhi (India)

    2014-05-01

    The Ce{sup 3+} doped and undoped samples of alkali earth metal tungstate MWO{sub 4} (M=Ca, Sr, and Ba) phosphors are synthesized by a co-precipitation method in controlled pH environment. The resulting phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), photoluminescence (PL) and thermoluminescence (TL). XRD pattern and SEM micrographs reveal the formation of agglomerated microcrystalline phosphor. FTIR spectra show the strong absorption around 821 cm{sup ?1} due to characteristic vibrations of (WO{sub 4}){sup 2?} complex. PL excitation spectra show broadband in the UV region having peak at 280 nm, and the emission spectrum shows broadband in the visible region with peak in the blue region. The PL emission intensity increases with Ce{sup 3+} concentration with the most effective concentration at 5 mol%. The complex TL glow curve of Ce{sup 3+} doped phosphors is deconvoluted by using a TLAnal computer program. The trap parameters obtained by TLAnal were compared with those calculated by Chen's method and a possible model for TL is discussed. - Highlights: • M{sub 1?x}WO{sub 4}:Ce{sub x} (M=Ca, Sr, and Ba) phosphors are synthesized by the co-precipitation method in controlled pH environment. • Phosphor exhibits broad emission band with maximum in the blue region. • Enhancement of PL emission intensity due to doping of Ce in a host lattice. • The complex TL glow curves were deconvoluted by TLAnal. • FTIR spectra show the main transmittance peaks related to v{sub 3} and v{sub 4} vibration modes of W–O bonds.

  20. Control Flow Analysis for BioAmbients

    DEFF Research Database (Denmark)

    Nielson, Flemming; Nielson, Hanne Riis; Priami, C.; Rosa, D. Schuch da

    2007-01-01

    This paper presents a static analysis for investigating properties of biological systems specified in BioAmbients. We exploit the control flow analysis to decode the bindings of variables induced by communications and to build a relation of the ambients that can interact with each other. We eventually apply our analysis to an example of gene regulation by positive feedback taken from the literature.

  1. The macroscopic analysis of radio – control problem

    Directory of Open Access Journals (Sweden)

    V. O. Bychkovskyi

    2013-12-01

    Full Text Available Introduction. Contemporary stage technique’s development is to characterize of radio – control systems broad application. Analysis radio – control systems is based usually on microscopic principle. Actual task is macroscopic point of view in radio – control problem. Problem statement. For radio control problem decision it is necessary describe the dynamics of process in generalize form. It is possible in conditions when macroscopic analysis is principal method. In this method it is actual the discount of probability of task fulfillment and information quantity. It is necessary find out the dependence between information quantity, relative error and dynamic characters of systems. Theoretical results. The regularities of task probability fulfillment in radio – control problem were consideration in dependence from control information quantity, information ability and relative error of radio – control system. Time of task fulfillment was determined for radio – control. The influence of speed increase coefficient of task fulfillment was determined. Typical substitution models for radio- control systems and relative errors were considerate. The information abilities of substitution models with discount of time constants and belated time were determined. For task fulfillment probability of radio – control were determine the dependences from time constants, belated time and speed increase coefficient of task fulfillment probability. Conclusion. Achieve results permit transfer the analysis of radio – control process on new quality level. Information, probability and characters of radio – control systems were taken into consideration. The ability for determination of task fulfillment time was open.

  2. 76 FR 28193 - Amendments to Material Control and Accounting Regulations

    Science.gov (United States)

    2011-05-16

    ...Amendments to Material Control and Accounting Regulations AGENCY: Nuclear Regulatory...amendments to the material control and accounting (MC&A) regulations. These regulations...outdated term, as it does not include ``accounting,'' and thus does not fully...

  3. Stray light analysis and control

    CERN Document Server

    Fest, Eric

    2013-01-01

    Stray light is defined as unwanted light in an optical system, a familiar concept for anyone who has taken a photograph with the sun in or near their camera's field of view. This book addresses stray light terminology, radiometry, and the physics of stray light mechanisms, such as surface roughness scatter and ghost reflections. The most-efficient ways of using stray light analysis software packages are included. The book also demonstrates how the basic principles are applied in the design, fabrication, and testing phases of optical system development.

  4. MCA4climate - a practical framework for pro-development climate policy

    DEFF Research Database (Denmark)

    Trevor, Morgan

    2011-01-01

    Climate is an inordinate challenge but also an inordinate opportunity to transform economies onto a low-carbon, resourcee !cient Green Economy path. Catalyzing clean energy will not only cut greenhouse-gas emissions as part of e”orts to limit a global temperature rise to under 2 degrees C or more, it also represents a way of curbing healthhazardous air pollution while o”ering a rapid path to address energy poverty, especially in rural areas of developing economies. Meanwhile enhancing ecosystems such as forests, mangroves and seagrasses in order to conserve their carbon stocks can also trigger multiple benefits from boosting water supplies and improving agriculture to maintaining natural sea defences and nurseries for fish. The 17th Conference of the Parties meeting in Durban, South Africa, later this year presents the world with another opportunity to advance the climate agenda and co-operative action under the UN Climate Convention. It is crucial that those actions are designed within a coherent and robust policy-planning framework to ensure that they are both cost-e”ective and compatible with broader social, economic and environmental goals. For developing countries, sound climatepolicy planning will also enhance access to climate finance from the developed ones. Climate-policy planning is a complex undertaking. Many developing countries are only just starting to consider how to go about it and some require improved access to the requisite knowledge, expertise and technical skills. Drawing upon best practices, tried and tested in other parts of the world, is clearly an advantage. The MCA4climate, a new UNEP initiative, is designed to assist policymakers, particularly in the developing world, in that endeavour. It o”ers concrete guidance and recommendations on a number of critical issues and proposes a formal framework for evaluating climate mitigation and adaptation policies, paving a practical way forward so that countries evolve sustainably and grow their economies in a way that keeps humanity’s footprint within planetary boundaries. It draws on the work of leading experts on climate policymaking from around the world and uses an innovative approach to assessing policies that ensures that climate policies and strategies take full account of developmental concerns and objectives. The MCA4climate initiative reflects UNEP’s mission to provide leadership and encourage partnership in caring for the environment by inspiring, informing and enabling nations and peoples to improve their quality of life without compromising that of future generations—issues at the centre of Rio+20 next year in Brazil as governments look to scale-up and accelerate the implementation of the agreements, including those relating to climate change, established in Rio in 1992.

  5. Analysis and design of hybrid control systems

    Energy Technology Data Exchange (ETDEWEB)

    Malmborg, J.

    1998-05-01

    Different aspects of hybrid control systems are treated: analysis, simulation, design and implementation. A systematic methodology using extended Lyapunov theory for design of hybrid systems is developed. The methodology is based on conventional control designs in separate regions together with a switching strategy. Dynamics are not well defined if the control design methods lead to fast mode switching. The dynamics depend on the salient features of the implementation of the mode switches. A theorem for the stability of second order switching together with the resulting dynamics is derived. The dynamics on an intersection of two sliding sets are defined for two relays working on different time scales. The current simulation packages have problems modeling and simulating hybrid systems. It is shown how fast mode switches can be found before or during simulation. The necessary analysis work is a very small overhead for a modern simulation tool. To get some experience from practical problems with hybrid control the switching strategy is implemented in two different software environments. In one of them a time-optimal controller is added to an existing PID controller on a commercial control system. Successful experiments with this hybrid controller shows the practical use of the method 78 refs, 51 figs, 2 tabs

  6. Preoperative cerebral perfusion SPECT identify patients at risk for transient neurological deterioration after STA-MCA bypass surgery

    Energy Technology Data Exchange (ETDEWEB)

    Lee, J. W.; Kim, Y. K.; Eo, J. S.; Oh, C. W.; Lee, W. W.; Kim, S. W. [Seoul National University Bundang Hospital, Bundang (Korea, Republic of)

    2007-07-01

    Transient neurological deterioration (TND) is one of the most fatal complications after extracranial-intracranial bypass surgery and it has been assumed to be caused by transient hyperperfusion. This study was performed to evaluate the relationship between TND and preoperative cerebral perfusion status on brain SPECT to identify patients who are at risk of TND following superficial temporal artery middle cerebral artery (STA-MCA) bypass surgery. Sixty patients who underwent STA-MCA bypass surgery were enrolled. The resting cerebral blood flow (CBF) and cerebral vascular reserve (CVR) after acetazolamide challenge were measured before and 10 days after surgery using Tc-99m ethylcysteinate dimmer SPECT. Moreover, the CBF was measured on the third day postoperation. Follow up perfusion SPECT 6 month after surgery were obtained in 42 patients. With the use of the statistical parametric mapping and probabilistic brain atlas, the counts for the MCA territory were calculated for each image and statistical analyses were performed. In 6 of 60 patients (10%), TND occurred after surgery. The average CBF on the third postoperative day was significantly higher than the preoperative CBF (p 0.003). Furthermore, in 42 patients who had brain SPECT in the 6 months following operation, cerebral perfusion in the 6 months post operation was still higher than that observed before the operation. The increase in CBF from the preoperative day to the third postoperative day negatively correlated with preoperative perfusion (correlation coefficient = -0.66, p 0.0006). In TND patients, basal CBF on preoperative SPECT was significantly lower (p=0.01), and the changes in CBF on the third day after surgery was significant higher (p = 0.008). However, CVR did not significantly correlate with the increased perfusion after operation. The preoperative CBF and the subsequent changes in CBF after operation can help identify the risk of TND after STA-MCA bypass surgery.

  7. A Report on the Mock Interviews Conducted for Students of MCA IV Semester in April 2011 at the ELTC

    OpenAIRE

    Aruna Lolla

    2012-01-01

    A mock interview was conducted for students of MCA IV Semester, University of Hyderabad on 9, 10 Apr-2011 with the help of the management and experts from outside. The Interview panel assessed the technical and communication competence of the students and gave them individual and group feedback on their performances. Students found it to be a good rehearsal for actual job interview. it was treated as a part of placement related training and continuous assessment of the students during the cou...

  8. In-house development of an FPGA-based MCA8K for gamma-ray spectrometer

    OpenAIRE

    Lanh, Dang; Son, Pham Ngoc; Son, Nguyen An

    2014-01-01

    The objective of this work is domestic development of electronics instruments. It used for measuring ionization radiation and practical training at Nuclear Research Institute (NRI), Dalat, Vietnam. The aim of this work is to study and develop a novel MCA8k for Gamma-ray spectrometer concerning experimental nuclear physics. An approach for design and construction of the aforementioned instrument is to apply logic integrating techniques via Field Programmable Gate Arrays (FPGA) under Max?+?Plus...

  9. SURFACE TEXTURE ANALYSIS FOR FUNCTIONALITY CONTROL

    DEFF Research Database (Denmark)

    De Chiffre, Leonardo; Andreasen, Jan Lasson; Tosello, Guido

    2003-01-01

    This document is used in connection with three exercises of 3 hours duration as a part of the course VISION ONLINE – One week course on Precision & Nanometrology. The exercises concern surface texture analysis for functionality control, in connection with three different case stories. This document contains a short description of each case story, 3-D roughness parameters analysis and relation with the product’s functionality.

  10. Applied behavior analysis and statistical process control?

    OpenAIRE

    Hopkins, B L

    1995-01-01

    This paper examines Pfadt and Wheeler's (1995) suggestions that the methods of statistical process control (SPC) be incorporated into applied behavior analysis. The research strategies of SPC are examined and compared to those of applied behavior analysis. I argue that the statistical methods that are a part of SPC would likely reduce applied behavior analysts' intimate contacts with the problems with which they deal and would, therefore, likely yield poor treatment and research decisions. Ex...

  11. The specific binding of transferrin to the murine fibroblast cell lines AKR-2B and its malignant counterpart AKR-MCA may be related to the transformed state

    International Nuclear Information System (INIS)

    The specific binding of radiolabelled transferrin to AKR-2B and AKR-MCA murine fibroblasts was studied. The binding of radioligand to both cell lines was specific, being displaced by excess of unlabelled transferrin but not myoglobin, or lactoperoxidase. Under equilibrium conditions the transformed line AKR-MCA bound significantly more radioactive transferrin (22.5 ± 3.5 fmol/?g DNA) than the parental line AKR-2B (14.5 ± 1.5 fmol/?g DNA). The differences in the amount of ligand bound was due to altered receptor numbers. Treatment of AKR-MCA and AKR-2B cells with DMF eliminated the difference in transferrin binding capacities. The maximum decrease in specific ligand binding to AKR-MCA cells brought about by polar solvent was observed after 48 h. These data suggest an association between transferrin binding and the transformed state of AKR-2B fibroblasts. (author) 15 refs

  12. PROMETHEE Method and Sensitivity Analysis in the Software Application for the Support of Decision-Making

    Directory of Open Access Journals (Sweden)

    Leopold Paszek

    2008-01-01

    Full Text Available PROMETHEE is one of methods, which fall into multi-criteria analysis (MCA. The MCA, as the name itself indicates, deals with the evaluation of particular variants according to several criteria. Developed software application (MCA8 for the support of multi-criteria decision-making was upgraded about PROMETHEE method and a graphic tool, which enables the execution of the sensitivity analysis. This analysis is used to ascertain how a given model output depends upon the input parameters. The MCA8 software application with mentioned graphic upgrade was developed for purposes of solving multi-criteria decision tasks. In the MCA8 is possible to perform sensitivity analysis by a simple form – through column graphs. We can change criteria significances (weights in these column graphs directly and watch the changes of the order of variants immediately.

  13. Residence Hall Damage: Analysis and Control.

    Science.gov (United States)

    Scheuermann, Thomas A.

    The problems of residence hall damage and vandalism are examined in this booklet. An analysis and control program is proposed to provide a systematic method of dealing with the problem. A list of basic assumptions held by students and staff on residence hall damage is presented for discussion. Problems created by damage to residence halls are also…

  14. Safety analysis of control rod drive computers

    International Nuclear Information System (INIS)

    The analysis of the most significant user programmes revealed no errors in these programmes. The evaluation of approximately 82 cumulated years of operation demonstrated that the operating system of the control rod positioning processor has a reliability that is sufficiently good for the tasks this computer has to fulfil. Computers can be used for safety relevant tasks. The experience gained with the control rod positioning processor confirms that computers are not less reliable than conventional instrumentation and control system for comparable tasks. The examination and evaluation of computers for safety relevant tasks can be done with programme analysis or statistical evaluation of the operating experience. Programme analysis is recommended for seldom used and well structured programmes. For programmes with a long, cumulated operating time a statistical evaluation is more advisable. The effort for examination and evaluation is not greater than the corresponding effort for conventional instrumentation and control systems. This project has also revealed that, where it is technologically sensible, process controlling computers or microprocessors can be qualified for safety relevant tasks without undue effort. (orig./HP)

  15. Application of dimensional analysis in systems modeling and control design

    CERN Document Server

    Balaguer, Pedro

    2013-01-01

    Dimensional analysis is an engineering tool that is widely applied to numerous engineering problems, but has only recently been applied to control theory and problems such as identification and model reduction, robust control, adaptive control, and PID control. Application of Dimensional Analysis in Systems Modeling and Control Design provides an introduction to the fundamentals of dimensional analysis for control engineers, and shows how they can exploit the benefits of the technique to theoretical and practical control problems.

  16. Analysis and control of distributed cooperative systems.

    Energy Technology Data Exchange (ETDEWEB)

    Feddema, John Todd; Parker, Eric Paul; Wagner, John S.; Schoenwald, David Alan

    2004-09-01

    As part of DARPA Information Processing Technology Office (IPTO) Software for Distributed Robotics (SDR) Program, Sandia National Laboratories has developed analysis and control software for coordinating tens to thousands of autonomous cooperative robotic agents (primarily unmanned ground vehicles) performing military operations such as reconnaissance, surveillance and target acquisition; countermine and explosive ordnance disposal; force protection and physical security; and logistics support. Due to the nature of these applications, the control techniques must be distributed, and they must not rely on high bandwidth communication between agents. At the same time, a single soldier must easily direct these large-scale systems. Finally, the control techniques must be provably convergent so as not to cause undo harm to civilians. In this project, provably convergent, moderate communication bandwidth, distributed control algorithms have been developed that can be regulated by a single soldier. We have simulated in great detail the control of low numbers of vehicles (up to 20) navigating throughout a building, and we have simulated in lesser detail the control of larger numbers of vehicles (up to 1000) trying to locate several targets in a large outdoor facility. Finally, we have experimentally validated the resulting control algorithms on smaller numbers of autonomous vehicles.

  17. Quantitative resilience analysis through control design.

    Energy Technology Data Exchange (ETDEWEB)

    Sunderland, Daniel; Vugrin, Eric D.; Camphouse, Russell Chris (Sandia National Laboratories, Carlsbad, NM)

    2009-09-01

    Critical infrastructure resilience has become a national priority for the U. S. Department of Homeland Security. System resilience has been studied for several decades in many different disciplines, but no standards or unifying methods exist for critical infrastructure resilience analysis. Few quantitative resilience methods exist, and those existing approaches tend to be rather simplistic and, hence, not capable of sufficiently assessing all aspects of critical infrastructure resilience. This report documents the results of a late-start Laboratory Directed Research and Development (LDRD) project that investigated the development of quantitative resilience through application of control design methods. Specifically, we conducted a survey of infrastructure models to assess what types of control design might be applicable for critical infrastructure resilience assessment. As a result of this survey, we developed a decision process that directs the resilience analyst to the control method that is most likely applicable to the system under consideration. Furthermore, we developed optimal control strategies for two sets of representative infrastructure systems to demonstrate how control methods could be used to assess the resilience of the systems to catastrophic disruptions. We present recommendations for future work to continue the development of quantitative resilience analysis methods.

  18. Evaluating control displays with the Engineering Control Analysis Tool (ECAT)

    International Nuclear Information System (INIS)

    In the Nuclear Power Industry increased use of automated sensors and advanced control systems is expected to reduce and/or change manning requirements. However, critical questions remain regarding the extent to which safety will be compromised if the cognitive workload associated with monitoring multiple automated systems is increased. Can operators/engineers maintain an acceptable level of performance if they are required to supervise multiple automated systems and respond appropriately to off-normal conditions? The interface to/from the automated systems must provide the information necessary for making appropriate decisions regarding intervention in the automated process, but be designed so that the cognitive load is neither too high nor too low for the operator who is responsible for the monitoring and decision making. This paper will describe a new tool that was developed to enhance the ability of human systems integration (HSI) professionals and systems engineers to identify operational tasks in which a high potential for human overload and error can be expected. The tool is entitled the Engineering Control Analysis Tool (ECAT). ECAT was designed and developed to assist in the analysis of: Reliability Centered Maintenance (RCM), operator task requirements, human error probabilities, workload prediction, potential control and display problems, and potential panel layout problems. (authors)

  19. Analysis and control of Boolean networks

    CERN Document Server

    Cheng, Daizhan; Li, Zhiqiang

    2010-01-01

    ""Analysis and Control of Boolean Networks"" presents a systematic new approach to the investigation of Boolean control networks. The fundamental tool in this approach is a novel matrix product called the semi-tensor product (STP). Using the STP, a logical function can be expressed as a conventional discrete-time linear system. In the light of this linear expression, certain major issues concerning Boolean network topology - fixed points, cycles, transient times and basins of attractors - can be easily revealed by a set of formulae. This framework renders the state-space approach to dynamic co

  20. Control Analysis of flexible Solar Sails

    Science.gov (United States)

    Thomas, Stephanie J.; Paluszek, Michael A.

    2005-01-01

    Future solar sail missions will require sails with dimensions on the order of 100 m to l km. At these sizes, given the gossamer nature of the sail supporting structures, flexible modes may be low enough to interact with the control system. This paper develops a practical analysis of the flexible interactions using state-space systems and modal data from standard finite element models of the sail sub- system. The modal data is combined with a rigid core bus to create a modal coordinate state-space plant, which can be analyzed for stability with a state-space controller. Results are presented for an 80 m sail for both collocated actuation and control by actuators mounted at the sail tips.

  1. Adult Moyamoya disease: 320-Multidetector row CT for evaluation of revascularization in STA–MCA bypasses surgery

    International Nuclear Information System (INIS)

    Purpose: To evaluate the utility of 320-multidetector row whole-brain computed tomography perfusion (WBCTP) and whole-head subtracted dynamic angiography (WHSDCTA) for assessing the revascularization of blood flow after superficial temporal artery (STA) to middle cerebral artery (MCA) bypass surgery in adults with Moyamoya disease (MD) in the short and long term. Patients and methods: 320-multidetector row WBCTP and WHSDCTA were applied in 20 patients with MD before and after surgery (for an average of 3 days and 3 months). The bypass arteries were investigated using WHSDCTA and compared with DSA. The regions of interests (ROIs) in the surgical and mirror sides of the cerebral cortex were drawn on a Vitrea Workstation. Cerebral blood volume (CBV), time to peak (TTP), cerebral blood flow (CBF), mean transit time (MTT), and delay time were recorded. Preoperative and postoperative perfusion parameters in the MCA distribution were compared using the paired t-test. Results: WHSDCTA could clearly demonstrate 24 bypass arteries in 26 arteries for 20 patients, results which were in accordance with the results of digital subtraction angiography (DSA). When comparing preoperative values to those within 3 days after surgery, only TTP and delay time were significantly different (P < 0.05). Values of CBV, TTP, CBF, delay time, and MTT 3 months after surgery were significantly different (P < 0.05) from those of preoperative perfusion. Conclusion: These data suggest that 320-multidetector row WBCTP and WHSDCTA can be used to evaluate the revascularization of blood flow after STA–MCA bypass surgery in patients with MD in the short and long term

  2. Human reliability analysis of control room operators

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Isaac J.A.L.; Carvalho, Paulo Victor R.; Grecco, Claudio H.S. [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil)

    2005-07-01

    Human reliability is the probability that a person correctly performs some system required action in a required time period and performs no extraneous action that can degrade the system Human reliability analysis (HRA) is the analysis, prediction and evaluation of work-oriented human performance using some indices as human error likelihood and probability of task accomplishment. Significant progress has been made in the HRA field during the last years, mainly in nuclear area. Some first-generation HRA methods were developed, as THERP (Technique for human error rate prediction). Now, an array of called second-generation methods are emerging as alternatives, for instance ATHEANA (A Technique for human event analysis). The ergonomics approach has as tool the ergonomic work analysis. It focus on the study of operator's activities in physical and mental form, considering at the same time the observed characteristics of operator and the elements of the work environment as they are presented to and perceived by the operators. The aim of this paper is to propose a methodology to analyze the human reliability of the operators of industrial plant control room, using a framework that includes the approach used by ATHEANA, THERP and the work ergonomics analysis. (author)

  3. Ivy signs on FLAIR images before and after STA-MCA anastomosis in patients with Moyamoya disease

    International Nuclear Information System (INIS)

    Background: Leptomeningeal high signal intensity (ivy sign) on fluid-attenuated inversion-recovery (FLAIR) MR imaging is one of the features of Moyamoya disease. However, the correlation between ivy sign and cerebral perfusion status has not been fully evaluated. Purpose: To characterize ivy sign on FLAIR images in Moyamoya disease and compare this finding with hemodynamic alterations on perfusion single-photon emission CT (SPECT) obtained before and after bypass surgery. Material and Methods: Sixteen patients with angiographically confirmed Moyamoya disease who underwent superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis were included in the study. The presence of ivy sign on FLAIR images was classified as 'negative', 'minimal' and 'positive'. We evaluated the relationship between ivy sign and findings of SPECT, including cerebral vascular reserve (CVR) before and after surgery. Results: Minimal or positive ivy sign was seen in 13 (81%) of 16 patients, and 21 (66%) of 32 hemispheres. CVR in the areas with positive or minimal ivy sign was lower than that in the areas with negative ivy sign. After STA-MCA anastomosis, ivy sign disappeared or decreased in all 21 hemispheres demonstrating ivy sign. SPECT demonstrated apparent hemodynamic improvement in areas demonstrating disappearance or decrease of ivy sign. Conclusion: Ivy sign on FLAIR image is seen in areas with decreased cerebral perfusion. The sign is useful for non-invasive assessment of cerebral hemodynamic status before and after surgery

  4. Efficacy Assessment of Endovascular Stenting in Patients with Unilateral Middle Cerebral Artery Stenosis Using Statistical Probabilistic Anatomical Mapping Analysis of Basal/Acetazolamide Brain Perfusion SPECT

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hae Won; Won, Kyoung Sook; Zeon, Seok Kil; Lee, Chang Young [Keimyung University, School of Medicine, Daegu (Korea, Republic of)

    2009-08-15

    The aim of this study was to evaluate the hemodynamic changes after endovascular stenting in patients with unilateral middle cerebral artery (MCA) stenosis using statistical probabilistic anatomical mapping (SPAM) analysis of basal/acetazolamide (ACZ) Tc-99m ECD brain perfusion SPECT. Eight patients (3 men and 5 women, 64.8{+-}10.5 years) who underwent endovascular stenting for unilateral MCA stenosis were enrolled. Basal/ACZ Tc-99m ECD brain perfusion SPECT studies were performed by one-day protocol before and after stenting. Using SPAM analysis, we compared basal cerebral perfusion (BCP) counts and cerebrovascular reserve (CVR) index of the MCA territory before stenting with those after stenting. After stenting, no patient had any complication nor additional stroke. In SPAM analysis, 7 out of the 8 patients had improved BCP counts of the MCA territory and 7 out of the 8 patients had improved CVR index of the MCA territory after stenting. Before stenting, the mean BCP counts and CVR index in the affected MCA territory were 47.1{+-}2.2 ml/min/100 g and -2.1{+-}2.9%, respectively. After stenting, the mean BCP counts and CVR index in the affected MCA territory were improved significantly (48.3{+-}2.9 ml/min/100 g, p=0.025 and 0.1{+-}1.3%, p=0.036). This study revealed that SPAM analysis of basal/ACZ brain perfusion SPECT would be helpful to evaluate hemodynamic efficacy of endovascular stenting in unilateral MCA stenosis.

  5. Radioactivity analysis of food and accuracy control

    International Nuclear Information System (INIS)

    From the fact that radioactive substances have been detected from the foods such as agricultural and livestock products and marine products due to the accident of the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company, the Ministry of Health, Labour and Welfare stipulated new standards geared to general foods on radioactive cesium by replacing the interim standards up to now. Various institutions began to measure radioactivity on the basis of this instruction, but as a new challenge, a problem of the reliability of the data occurred. Therefore, accuracy control to indicate the proof that the quality of the data can be retained at an appropriate level judging from an objective manner is important. In order to consecutively implement quality management activities, it is necessary for each inspection agency to build an accuracy control system. This paper introduces support service, as a new attempt, for establishing the accuracy control system. This service is offered jointly by three organizations, such as TUV Rheinland Japan Ltd., Japan Frozen Foods Inspection Corporation, and Japan Chemical Analysis Center. This service consists of the training of radioactivity measurement practitioners, proficiency test for radioactive substance measurement, and personal authentication. (O.A.)

  6. MAP Attitude Control System Design and Analysis

    Science.gov (United States)

    Andrews, S. F.; Campbell, C. E.; Ericsson-Jackson, A. J.; Markley, F. L.; ODonnell, J. R., Jr.

    1997-01-01

    The Microwave Anisotropy Probe (MAP) is a follow-on to the Differential Microwave Radiometer (DMR) instrument on the Cosmic Background Explorer (COBE) spacecraft. The MAP spacecraft will perform its mission in a Lissajous orbit around the Earth-Sun L(sub 2) Lagrange point to suppress potential instrument disturbances. To make a full-sky map of cosmic microwave background fluctuations, a combination fast spin and slow precession motion will be used. MAP requires a propulsion system to reach L(sub 2), to unload system momentum, and to perform stationkeeping maneuvers once at L(sub 2). A minimum hardware, power and thermal safe control mode must also be provided. Sufficient attitude knowledge must be provided to yield instrument pointing to a standard deviation of 1.8 arc-minutes. The short development time and tight budgets require a new way of designing, simulating, and analyzing the Attitude Control System (ACS). This paper presents the design and analysis of the control system to meet these requirements.

  7. Improving Software Systems By Flow Control Analysis

    Directory of Open Access Journals (Sweden)

    Piotr Poznanski

    2012-01-01

    Full Text Available Using agile methods during the implementation of the system that meets mission critical requirements can be a real challenge. The change in the system built of dozens or even hundreds of specialized devices with embedded software requires the cooperation of a large group of engineers. This article presents a solution that supports parallel work of groups of system analysts and software developers. Deployment of formal rules to the requirements written in natural language enables using formal analysis of artifacts being a bridge between software and system requirements. Formalism and textual form of requirements allowed the automatic generation of message ?ow graph for the (sub system, called the “big-picture-model”. Flow diagram analysis helped to avoid a large number of defects whose repair cost in extreme cases could undermine the legitimacy of agile methods in projects of this scale. Retrospectively, a reduction of technical debt was observed. Continuous analysis of the “big picture model” improves the control of the quality parameters of the software architecture. The article also tries to explain why the commercial platform based on UML modeling language may not be su?cient in projects of this complexity.

  8. Studying On Digital Signal Processing Method For Tested Design And The Construction Of DSP-Based MCA 1K

    International Nuclear Information System (INIS)

    DSP is one of the most useful tools for development of nuclear electronics instruments for Physics research. The method can be carried out by either a special digital signal processor or FPGA which is programmed through VHDL. In this case, Digital signal processing (DPS) is performed by VHDL. The aim of this project is to study on digital signal processing for tested design and construction of DSP-based MCA 1K. VHDL standards for VHSIC hardware description language. Due to VHDL, memory and Central processing unit are created. An application software for receiving data is written in LabVIEW 8.5. Spartan 3E starter kit is used for design of the project, combining with ISE software, XilinX 9.2i. (author)

  9. Structurally constrained controllers analysis and synthesis

    CERN Document Server

    Sojoudi, Somayeh; Aghdam, Amir G

    2011-01-01

    Explains and investigates recent cutting edge applications including such topics as formation flyingComplete coverage of robust control in structurally constrained controllersDiscusses the performance evaluation of decentralized controllersExplains how to use new LMI method to solve traditional constrained control problems

  10. Strategic Planning and Decision Analysis: Presentation of the COSIMA Software System

    DEFF Research Database (Denmark)

    This paper presents a composite decision support system, COSIMA, programmed in MS Excel. COSIMA provides assistance to the decision maker as concerns complex decisions and strategic planning. The COSIMA software is designed as interconnected modules which make it possible to conduct Cost-Benefit Analysis and Multi-Criteria Analysis (MCA) either in combination or separated. The MCA module is based on the AHP and SMARTER techniques. COSIMA also handles risk analysis using Monte Carlo simulation.

  11. Power flow analysis for DC voltage droop controlled DC microgrids

    OpenAIRE

    Li, Chendan; Chaudhary, Sanjay; Dragicevic, Tomislav; Vasquez, Juan Carlos; Guerrero, Josep M.

    2014-01-01

    This paper proposes a new algorithm for power flow analysis in droop controlled DC microgrids. By considering the droop control in the power flow analysis for the DC microgrid, when compared with traditional methods, more accurate analysis results can be obtained. The algorithm verification is carried out by comparing the calculation results with detailed time domain simulation results. With the droop parameters as variables in the power flow analysis, their effects on power sharing and secon...

  12. Power flow analysis for DC voltage droop controlled DC microgrids

    DEFF Research Database (Denmark)

    Li, Chendan; Chaudhary, Sanjay; Dragicevic, Tomislav; Vasquez, Juan Carlos; Guerrero, Josep M.

    2014-01-01

    This paper proposes a new algorithm for power flow analysis in droop controlled DC microgrids. By considering the droop control in the power flow analysis for the DC microgrid, when compared with traditional methods, more accurate analysis results can be obtained. The algorithm verification is carried out by comparing the calculation results with detailed time domain simulation results. With the droop parameters as variables in the power flow analysis, their effects on power sharing and secondar...

  13. Power flow analysis for DC voltage droop controlled DC microgrids

    DEFF Research Database (Denmark)

    Li, Chendan; Chaudhary, Sanjay

    2014-01-01

    This paper proposes a new algorithm for power flow analysis in droop controlled DC microgrids. By considering the droop control in the power flow analysis for the DC microgrid, when compared with traditional methods, more accurate analysis results can be obtained. The algorithm verification is carried out by comparing the calculation results with detailed time domain simulation results. With the droop parameters as variables in the power flow analysis, their effects on power sharing and secondary voltage regulation can now be analytically studied, and specialized optimization in the upper level control can also be made accordingly. Case studies on power sharing and secondary voltage regulation are carried out using proposed power flow analysis.

  14. Control design and analysis for underactuated robotic systems

    CERN Document Server

    Xin, Xin

    2014-01-01

    The last two decades have witnessed considerable progress in the study of underactuated robotic systems (URSs). Control Design and Analysis for Underactuated Robotic Systems presents a unified treatment of control design and analysis for a class of URSs, which include systems with multiple-degree-of-freedom and/or with underactuation degree two. It presents novel notions, features, design techniques, and strictly global motion analysis results for these systems. These new materials are shown to be vital in studying the control design and stability analysis of URSs. Control Design and Analysis for Underactuated Robotic Systems includes the modelling, control design, and analysis presented in a systematic way particularly for the following examples: l  directly and remotely driven  Acrobots l  Pendubot l  rotational pendulum l  counter-weighted Acrobot 2-link underactuated robot with flexible elbow joint l  variable-length pendulum l  3-link gymnastic robot with passive first joint l  n-link planar robo...

  15. Control and Analysis of Droop and Reverse Droop Controllers for Distributed Generations

    DEFF Research Database (Denmark)

    Wu, Dan; Tang, Fen

    2014-01-01

    This paper addresses control and analysis of droop and reverse droop control for distributed generations (DG). The droop control is well known applied to the voltage control mode (VCM) DG units, but has limitation when implemented on the current control mode (CCM) units. Therefore, this paper gives a more complete primary control for DG systems that integrates with both VCM and CCM units. The power management can be uniformly achieved by designing proportional droop and reverse droop parameters. And the power sharing effect among CCM and VCM DG units is discussed. Finally, hardware-in-the-loop simulations are carried out to validate the proposed control and analysis.

  16. Adaptive control algorithms, analysis and applications

    CERN Document Server

    Landau, Ioan Doré; M'Saad, Mohammed; Karimi, Alireza

    2011-01-01

    Thoroughly revised and updated, this second edition of Adaptive Control covers new developments in the field, including multi-model adaptive control with switching, direct and indirect adaptive regulation, and adaptive feedforward disturbance compensation.

  17. Distributional Analysis for Model Predictive Deferrable Load Control

    OpenAIRE

    Chen, Niangjun; Gan, Lingwen; Low, Steven H.; Wierman, Adam

    2014-01-01

    Deferrable load control is essential for handling the uncertainties associated with the increasing penetration of renewable generation. Model predictive control has emerged as an effective approach for deferrable load control, and has received considerable attention. In particular, previous work has analyzed the average-case performance of model predictive deferrable load control. However, to this point, distributional analysis of model predictive deferrable load control has...

  18. Analysis and control of nonlinear systems

    CERN Document Server

    Levine, Jean

    2009-01-01

    A work on a hot topic in the field of control of nonlinear systems that ranges from mathematical system theory to practical industrial control applications. It addresses two fundamental questions in Systems and Control: how to plan the motion of a system and track the corresponding trajectory in presence of perturbations.

  19. MIMCA: Multiple imputation for categorical variables with multiple correspondence analysis

    OpenAIRE

    Audigier, Vincent; Husson, François; Josse, Julie

    2015-01-01

    We propose a multiple imputation method to deal with incomplete categorical data. This method imputes the missing entries using the principal components method dedicated to categorical data: multiple correspondence analysis (MCA). The uncertainty concerning the parameters of the imputation model is reflected using a non-parametric bootstrap. Multiple imputation using MCA (MIMCA) requires estimating a small number of parameters due to the dimensionality reduction property of ...

  20. Uncertainty analysis of weather controlled systems

    OpenAIRE

    Keesman, K.J.; Doeswijk, T.G.

    2010-01-01

    The indoor climate of many storage facilities for agricultural produce is controlled by mixing ambient air with the air flow through the store room. Hence, the indoor climate is affected by the ambient weather conditions. Given hourly fluctuating energy tariffs, weather forecasts over some days are required to effectively anticipate. Hence, typically a real-time optimal control strategy results. As weather forecasts are uncertain, predicted model outputs and related costs of the control strat...

  1. PID control system analysis and design

    OpenAIRE

    Li, Y.; Ang, K.H.; Chong, G.C.Y.

    2006-01-01

    With its three-term functionality offering treatment of both transient and steady-state responses, proportional-integral-derivative (PID) control provides a generic and efficient solution to realworld control problems. The wide application of PID control has stimulated and sustained research and development to "get the best out of PID", and "the search is on to find the next key technology or methodology for PID tuning". This article presents remedies for problems involving the...

  2. Dissipative systems analysis and control theory and applications

    CERN Document Server

    Brogliato, Bernard; Maschke, Bernhard; Egeland, Olav

    2006-01-01

    Many important physical systems have input-output properties related to the conservation, dissipation and transport of energy. The theory surrounding such ""dissipative properties"" may be used as a framework for the design and analysis of control systems. The consideration of dissipativity is useful - and may be indispensable - for control applications like robotics, active vibration damping and circuit theory and for some control techniques themselves: adaptive, nonlinear-H-infinity , and inverse-optimal control among them.Dissipative Systems Analysis and Control (second edition) presents a

  3. Solar Dynamic Power System Stability Analysis and Control

    Science.gov (United States)

    Momoh, James A.; Wang, Yanchun

    1996-01-01

    The objective of this research is to conduct dynamic analysis, control design, and control performance test of solar power system. Solar power system consists of generation system and distribution network system. A bench mark system is used in this research, which includes a generator with excitation system and governor, an ac/dc converter, six DDCU's and forty-eight loads. A detailed model is used for modeling generator. Excitation system is represented by a third order model. DDCU is represented by a seventh order system. The load is modeled by the combination of constant power and constant impedance. Eigen-analysis and eigen-sensitivity analysis are used for system dynamic analysis. The effects of excitation system, governor, ac/dc converter control, and the type of load on system stability are discussed. In order to improve system transient stability, nonlinear ac/dc converter control is introduced. The direct linearization method is used for control design. The dynamic analysis results show that these controls affect system stability in different ways. The parameter coordination of controllers are recommended based on the dynamic analysis. It is concluded from the present studies that system stability is improved by the coordination of control parameters and the nonlinear ac/dc converter control stabilize system oscillation caused by the load change and system fault efficiently.

  4. Attainability analysis in stochastic controlled systems

    International Nuclear Information System (INIS)

    A control problem for stochastically forced nonlinear continuous-time systems is considered. We propose a method for construction of the regulator that provides a preassigned probabilistic distribution of random states in stochastic equilibrium. Geometric criteria of the controllability are obtained. Constructive technique for the specification of attainability sets is suggested

  5. Analysis and Control of the Pan System via Sliding Mode Control

    OpenAIRE

    Sundarapandian Vaidyanathan

    2012-01-01

    In this paper, we obtain new results for the analysis and control of the Pan system (2010) using sliding mode control (SMC). The stability results derived in this paper for the control of the Pan system to stabilize about its unstable equilibrium at the origin have been derived using sliding mode control and Lyapunovstability theory. Numerical simulations are depicted to demonstrate the control results derived in this paper.

  6. Analysis of Reconfigured Control Loop with a Virtual Actuator

    Directory of Open Access Journals (Sweden)

    Anna Filasova

    2011-01-01

    Full Text Available Control reconfiguration changes the control structure in response to a fault detected in the plant. This becomes necessary, because a major fault like loss of an actuator breaks the corresponding control loop and therefore renders the whole system inoperable.  An important aim of control reconfiguration is to change the control structure as little as possible, since every change bears the potential of practical problems. The proposed solution is to keep the original controller in the loop and to add an extension called virtual actuator that implements the necessary changes of the control structure. The virtual actuator translates between the signals of the nominal controller and the signal of the faulty plants. This paper is concerned with the analysis of reconfigured loop with a virtual actuator for the system with the faulty actuator. The proposed analysis is illustrated on numerical example.

  7. Some chaotic behaviors in a MCA learning algorithm with a constant learning rate

    International Nuclear Information System (INIS)

    Douglas's minor component analysis algorithm with a constant learning rate has both stability and chaotic dynamical behavior under some conditions. The paper explores such dynamical behavior of this algorithm. Certain stability and chaos of this algorithm are derived. Waveform plots, Lyapunov exponents and bifurcation diagrams are presented to illustrate the existence of chaotic behavior

  8. OPTIMAL DESIGN AND ANALYSIS OF A CHEMICAL PROCESS CONTROL SYSTEM

    OpenAIRE

    Ashis Kumar Das

    2013-01-01

    The present work describes the design and analysis of a chemical process control system. The design is accomplished to attain the optimality of control operation. The total system is supposed to consist of the suitable controller operated in the closed loop manner with negative feedback path, affording the suitable output to the input. The optimality of the performance for the system is considered to be attained with gain of the (PD) controller [1], so chosen that the integral square error be...

  9. Analysis and Design of PLL Motor Speed Control System

    OpenAIRE

    Qi Chao Zhang

    2013-01-01

    Phase-locked technology in motor speed control system has a wide range of applications, Especially for high accuracy in the motor steady speed operation situation, more and more use of phase-locked servo control system. This paper describes the block diagram and mathematical model of phase-locked control system, Shows the circuit parameter calculation method This and combined with design example analysis of phase-locked control system, Indicated through the theory and practice, using PLL can ...

  10. MPO4:Nd3+ (M=Ca, Gd), Luminomagnetic Nanophosphors with Optical and Magnetic Features for Multimodal Imaging Applications

    Science.gov (United States)

    Rightsell, Chris; Mimun, Lawrence C.; Kumar, Ajith G.; Sardar, Dhiraj K.

    2015-03-01

    Nanomaterials with multiple functionalities play a very important role in several high technology applications. A major area of such applications is the biomedical industry, where contrast agents with multiple imaging modalities can provide better results than conventional materials. Many of the contrast agents available now have drawbacks such as toxicity, photobleaching, low contrast, size restrictions, and overall cost of the imaging system. Rare-earth doped inorganic nanophosphors are alternatives to circumvent several of these issues, together with the added advantage of super high resolution imaging due to the excellent near infrared sensitivity of the phosphors. In addition to optical imaging features, by adding a magnetic ion such as Gd3+ at suitable lattice positions, the phosphor can be made magnetic, yielding dual imaging functionalities. In this research, we are presenting the optical and magnetic imaging features of sub-nanometer size MPO4:Nd3+ (M=Ca, Gd) phosphors for the potential application of these nanophosphors as multimodal contrast agents. Cytotoxicity, in vitro and in vivo imaging, penetration depth etc. are studied for various phosphor compositions, and optimized compositions are explored. This research was funded by the National Science Foundation Partnerships for Research and Education in Materials (NSF-PREM) Grant N0-DMR-0934218.

  11. Design and Simulation of Seido Buffer for Analog to Digital Converter (ADC) on Multichannel Analyzer (MCA) Application

    International Nuclear Information System (INIS)

    Most of our electronic equipment has buffer, thus this make buffer as one of importance in electronic gadget. This paper introduced Single Ended Input Differential Output (SEIDO) buffer to predict the bias at approximately 2.5 V. For this purpose, the input range between -1 mV to 4 V was implemented. The software used to cascade SEIDO buffer is called LTspice IV; an open source software developed by Linear Technology Incorporation. The component involve in this development was Operational Amplifier (OP AMP) AD826 from Analog Devices Incorporation, capacitor and resistor. Kirchhoffs Current Law and Kirchhoffs Voltage Law was applied to calculated voltage gain and biasing voltage. All design has been verified by LTspice IV. The result produced from simulation was between -0.3 V to 6.3 V with bias roughly at 2.5 V. These results prove that it was capable to drive Analog Digital Converter (ADC) that can subsequently apply for Multichannel Analyzer (MCA). (author)

  12. Analysis of inventory difference using fuzzy controllers

    Energy Technology Data Exchange (ETDEWEB)

    Zardecki, A.

    1994-08-01

    The principal objectives of an accounting system for safeguarding nuclear materials are as follows: (a) to provide assurance that all material quantities are present in the correct amount; (b) to provide timely detection of material loss; and (c) to estimate the amount of any loss and its location. In fuzzy control, expert knowledge is encoded in the form of fuzzy rules, which describe recommended actions for different classes of situations represented by fuzzy sets. The concept of a fuzzy controller is applied to the forecasting problem in a time series, specifically, to forecasting and detecting anomalies in inventory differences. This paper reviews the basic notion underlying the fuzzy control systems and provides examples of application. The well-known material-unaccounted-for diffusion plant data of Jaech are analyzed using both feedforward neural networks and fuzzy controllers. By forming a deference between the forecasted and observed signals, an efficient method to detect small signals in background noise is implemented.

  13. Analysis of inventory difference using fuzzy controllers

    International Nuclear Information System (INIS)

    The principal objectives of an accounting system for safeguarding nuclear materials are as follows: (a) to provide assurance that all material quantities are present in the correct amount; (b) to provide timely detection of material loss; and (c) to estimate the amount of any loss and its location. In fuzzy control, expert knowledge is encoded in the form of fuzzy rules, which describe recommended actions for different classes of situations represented by fuzzy sets. The concept of a fuzzy controller is applied to the forecasting problem in a time series, specifically, to forecasting and detecting anomalies in inventory differences. This paper reviews the basic notion underlying the fuzzy control systems and provides examples of application. The well-known material-unaccounted-for diffusion plant data of Jaech are analyzed using both feedforward neural networks and fuzzy controllers. By forming a deference between the forecasted and observed signals, an efficient method to detect small signals in background noise is implemented

  14. INTERNAL AUDIT COMPARATIVE ANALYSIS - MANAGEMENT CONTROL CONCEPTS

    OpenAIRE

    MIHAI-DOREL JURCHESCU; N?T?LI?A-MIHAELA LESCONI-FRUMU?ANU

    2010-01-01

    Given Romania's integration into the European Union we consider it appropriate to clarify some terms used in auditing activities of both public funds and European funds. International practice requires a clear separation of internal audit activities from other management control concepts and recommend to establish an internal controlling system as well as an internal audit structure under the coordination of the manager as being the only ways cap able to respond to current risks faced by ...

  15. Synthesis and luminescence properties of glass ceramics containing MSiO3:Eu2+ (M=Ca, Sr, Ba) phosphors for white LED

    International Nuclear Information System (INIS)

    Eu2+ doped silicate glasses were prepared of the system 52SiO2-48MO: xEu2+(in molar ratio, M=Ca, Sr, Ba; x=1, 3, 5, 7, 9) by a high temperature melt-quenching method in a reducing atmosphere. Glass ceramics containing MSiO3:Eu2+(M=Ca, Sr, Ba) nano-phosphors were obtained after the heat treatment of the glass samples. The excitation, emission spectra and lifetime decay curves of 4f65d1?4f7 of Eu2+ were measured and interpreted with respect to their crystal structures and multi-site occupations of divalent europium in the hosts. Their excitation bands mainly extend from 450 to 250 nm, which is adaptable to the main emission region of the UV LED chip. With UV light excitation, the Eu2+ emission in CaSiO3, SrSiO3 and BaSiO3 shows blue, green and yellow colors centered at 440, 505 and 555 nm, respectively. The critical Eu2+concentration was studied and determined to be x=5 for both CaSiO3 and SrSiO3 and x=7 for BaSiO3 phosphors. The results show that the Eu2+ doped glass ceramic phosphors containing MSiO3 (M=Ca, Sr, Ba) nano-crystals can be used as potential matrix materials for a high power white LED pumped by the UV LED chip. - Highlights: ? Glass ceramic containing MSiO3:Eu2+ (M=Ca, Sr, Ba) phosphors prepared. ? Derived phosphors emit intensively blue, green and yellow colors. ? Their luminescence properties and crystal structures have been investigated. ? Concentration quenching effects observed and analyzed. ? Potential application for UV chip exciting white LED evaluated.

  16. Systems with delays analysis, control, and computations

    CERN Document Server

    Kim, A V

    2015-01-01

    The edition introduces a new class of invariant derivatives  and shows their relationships with other derivatives, such as the Sobolev generalized derivative and the generalized derivative of the distribution theory. This is a new direction in mathematics.   i-Smooth analysis is the branch of functional analysis that considers the theory and applications of the invariant derivatives of functions and functionals. The important direction of i-smooth analysis is the investigation of the relation of invariant derivatives with the Sobolev generalized derivative and the generalized derivative o

  17. Complexity, Analysis and Control of Singular Biological Systems

    CERN Document Server

    Zhang, Qingling; Zhang, Xue

    2012-01-01

    Complexity, Analysis and Control of Singular Biological Systems follows the control of real-world biological systems at both ecological and phyisological levels concentrating on the application of now-extensively-investigated singular system theory. Much effort has recently been dedicated to the modelling and analysis of developing bioeconomic systems and the text establishes singular examples of these, showing how proper control can help to maintain sustainable economic development of biological resources. The book begins from the essentials of singular systems theory and bifurcations before tackling  the use of various forms of control in singular biological systems using examples including predator-prey relationships and viral vaccination and quarantine control. Researchers and graduate students studying the control of complex biological systems are shown how a variety of methods can be brought to bear and practitioners working with the economics of biological systems and their control will also find the ...

  18. The Importance of Variance Analysis for Costs Control in Organizations

    OpenAIRE

    Okoh, L. O.; Uzoka, P.

    2012-01-01

    This review aimed at examining the importance of variance analysis for cost control in organizations. The study x-rayed the concept of variance analysis, types, sources, objectives and its significance. The study reported that variance analysis has significant influence in evaluating individual performance in organizations, assignment of responsibilities to individuals and assisting management to rely on the principle of management by exception and recommended among others, variances analysis...

  19. The Importance of Variance Analysis for Costs Control in Organizations

    Directory of Open Access Journals (Sweden)

    Okoh, L. O.

    2012-08-01

    Full Text Available This review aimed at examining the importance of variance analysis for cost control in organizations. The study x-rayed the concept of variance analysis, types, sources, objectives and its significance. The study reported that variance analysis has significant influence in evaluating individual performance in organizations, assignment of responsibilities to individuals and assisting management to rely on the principle of management by exception and recommended among others, variances analysis should be based upon scientifically established standards.

  20. INTERNAL AUDIT COMPARATIVE ANALYSIS - MANAGEMENT CONTROL CONCEPTS

    Directory of Open Access Journals (Sweden)

    MIHAI-DOREL JURCHESCU

    2010-01-01

    Full Text Available Given Romania's integration into the European Union we consider it appropriate to clarify some terms used in auditing activities of both public funds and European funds. International practice requires a clear separation of internal audit activities from other management control concepts and recommend to establish an internal controlling system as well as an internal audit structure under the coordination of the manager as being the only ways cap able to respond to current risks faced by public entities. Internal Audit, along its evolution - characterized by complex dynamics and adaptability - created confusion regarding the concept of control. The research presented in this paper is based on works published to date regarding the conceptual boundaries of this notion.

  1. Genetic diversity analysis in rice mutants using isozyme and Morphological markers

    International Nuclear Information System (INIS)

    In this work, isozyme and agromorphologic variability of radiation-induced rice mutants with different cytoplasm base was surveyed. Agromorphologic data (plant type, lodging resistance, life cycle and yielding) were transformed into binary data. This markers, along with isozyme (Peroxidases, Esterases, Catalases, Alcohol Dehydrogenases and Polyphenoloxidase) data, were considered for genetic diversity analyses in order to estimate the extent of diversity generated by ionizing radiation. Genetic Similarity between individuals was obtained based on Dice's Coefficient. The UPGMA phenogram defined three main clusters that clearly corresponded to the different cytoplasm sources. However, further discrimination between control varieties and their mutants could be obtained. Bootstrapping analysis was performed to estimate the robustness of the group in the phenogram. According to their bootstrap P value (99.6%), Basmati-370 mutant lines could be considered statistically different from their control. This analysis is suggested as an useful supporting tool for an accurate varietal validation. A Multiple Correspondence Analysis (MCA) showed individuals dispersion around the three principal axis of variation. In general the UPGMA phenogram pattern was corroborated at MCA. Variables such as life cycle, presence of bands Est-a and Prx-m and the absence of Est-i, Prx-h and Prx-i accounted for the higher contribution to variation. The adequacy of morphological and isozyme descriptors for new mutant lines validation is also discussed

  2. Applications of functional analysis to optimal control problems

    International Nuclear Information System (INIS)

    Some basic concepts in functional analysis, a general norm, the Hoelder inequality, functionals and the Hahn-Banach theorem are described; a mathematical formulation of two optimal control problems is introduced by the method of functional analysis. The problem of time-optimal control systems with both norm constraints on control inputs and on state variables at discrete intermediate times is formulated as an L-problem in the theory of moments. The simplex method is used for solving a non-linear minimizing problem inherent in the functional analysis solution to this problem. Numerical results are presented for a train operation. The second problem is that of optimal control of discrete linear systems with quadratic cost functionals. The problem is concerned with the case of unconstrained control and fixed endpoints. This problem is formulated in terms of norms of functionals on suitable Banach spaces. (author)

  3. Comparative Performance Analysis between Fuzzy Logic Controller (FLC and PID Controller for an Inverted Pendulum System

    Directory of Open Access Journals (Sweden)

    Aleem Ahmed Khan

    2012-10-01

    Full Text Available The idea of this paper is to compare the time-response performance characteristics between two controllers having different strategy for an inverted pendulum system. The main objective is to determine which control strategy brings the better results in comparative analysis with regard to pendulum’s angle and cart’s position of the system. The inverted pendulum system in fact a critical and challenging control problem, which continually moves away from a stable state. Two Control strategies for an Inverted pendulum system model are presented for stabilized controlling such as Proportional-Integral-Derivatives (PID and Fuzzy Logic Controller (FLC Controllers. Matlab Simulation has been performed on Simulink platform shows that both controllers successfully controls Multi-output Inverted pendulum system. However PID is more efficient and has a better time response characteristics than FLC control strategy.

  4. Comparative Performance Analysis between Fuzzy Logic Controller (FLC) and PID Controller for an Inverted Pendulum System

    OpenAIRE

    Aleem Ahmed Khan; Kashan Hussain

    2012-01-01

    The idea of this paper is to compare the time-response performance characteristics between two controllers having different strategy for an inverted pendulum system. The main objective is to determine which control strategy brings the better results in comparative analysis with regard to pendulum’s angle and cart’s position of the system. The inverted pendulum system in fact a critical and challenging control problem, which continually moves away from a stable state. Two Control strategies fo...

  5. Time Series Analysis Forecasting and Control

    CERN Document Server

    Box, George E P; Reinsel, Gregory C

    2011-01-01

    A modernized new edition of one of the most trusted books on time series analysis. Since publication of the first edition in 1970, Time Series Analysis has served as one of the most influential and prominent works on the subject. This new edition maintains its balanced presentation of the tools for modeling and analyzing time series and also introduces the latest developments that have occurred n the field over the past decade through applications from areas such as business, finance, and engineering. The Fourth Edition provides a clearly written exploration of the key methods for building, cl

  6. COMQC, Quality Control Statistical Analysis for Means, Errors, Skewness, Kurtosis

    International Nuclear Information System (INIS)

    1 - Description of problem or function: COMQC is a quality control data analysis statistical program that calculates mean, standard deviation, range, skewness and kurtosis. Tolerance limits, confidence limits on the percent defective, and a one-way analysis of variance are also provided. 2 - Method of solution: The program consists of four subroutines which produce the following: histograms, control charts, group comparisons, and process capability study. Standard statistical methods and techniques are employed

  7. Use of {sup 123}I-IMP brain SPET to predict outcome following STA-MCA bypass surgery: cerebral blood flow but not vasoreactivity is a predictive parameter

    Energy Technology Data Exchange (ETDEWEB)

    Kume, Norihiko [Department of Radiology, National Cardiovascular Center, Osaka (Japan)]|[Department of Radiology, Yamaguchi University School of Medicine, Yamaguchi (Japan); Hayashida, Kohei [Department of Radiology, National Cardiovascular Center, Osaka (Japan); Iwama, Toru [Department of Neurosurgery, National Cardiovascular Center, Osaka (Japan); Cho, I. [Department of Nuclear Medicine, Yeungnam University Medical Center, Taegu (Korea, Republic of); Matsunaga, N. [Department of Radiology, Yamaguchi University School of Medicine, Yamaguchi (Japan)

    1998-12-01

    Superficial temporal artery - middle cerebral artery (STA-MCA) bypass surgery might improve the cerebral blood flow (CBF) but fail to reduce the risk of post-surgical events such as ischaemic stroke. In this study, we studied retrospectively whether the risk of post-surgical events corresponded to the change in resting CBF and/or the change in vasoreactivity observed before and after STA-MCA surgery using N-isopropyl-I-123-p-iodoamphetamine ({sup 123}I-IMP) brain single-photon emission tomography (SPET). {sup 123}I-IMP brain SPET images obtained at rest and following acetazolamide challenge both before and after STA-MCA surgery were studied in 30 patients. Resting CBF was estimated semiquantitatively using the resting count ratios of the middle cerebral artery (MCA) area to the cerebellum. Acetazolamide challenge was assumed to result in an average increase in flow of 40% in the cerebellum. The vasoreactive response was then estimated as the ratio of the change in counts (acetazolamide - rest) to the resting cerebellar counts multiplied by 1.4. We classified 14 patients (50.5{+-}19.3 years) into group I, who had a change in their resting CBF from before to after surgery of >10%, and 16 patients (54.0{+-}18.8 years) into group II, who had a change in their resting CBF from before to after surgery of {<=}10%. Oxygen-15 positron emission tomography (PET) studies were performed in five patients from group I and five patients from group II. One post-surgical event occurred in group I while there were eight post-surgical events in group II (P<0.05). Resting CBF improved by 20.4%{+-}7.5% in group I and by 0.9%{+-}6.9% in group II patients after surgery (P<0.001). No significant difference in the improvement in vasoreactivity was observed between group I patients (32.6%{+-}17.7%) and group II patients (24.6%{+-}15.6%) following surgery. Patients in the group I PET subset showed normalization of oxygen extraction fraction (OEF) from 0.59{+-}0.09 before surgery to 0.46{+-}0.06 after surgery (P<0.05), while patients in the group II PET subset showed no statistical difference in OEF before surgery (0.58{+-}0.14) and after surgery (0.54{+-} 0.05). We conclude that the outcome of STA-MCA bypass surgery can be predicted by the improvement in resting CBF but not by the improvement in vasoreactivity. (orig.) With 6 figs., 1 tab., 14 refs.

  8. 78 FR 67225 - Amendments to Material Control and Accounting Regulations

    Science.gov (United States)

    2013-11-08

    ...3150-AI61 Amendments to Material Control and Accounting Regulations AGENCY: Nuclear Regulatory...regulations for material control and accounting (MC&A) of special nuclear material...specify requirements for control and accounting of SNM that is held by a...

  9. Information Control Analysis of Business Group

    OpenAIRE

    Wang Wen-Sheng; Dong Meng

    2013-01-01

    The implementation of modern enterprise strategy needs the support of information system and networked information technology. This study confirms the importance of business group information construction by the analysis of information technology dynamics and the result of information technology development effected industry. Besides, it discussed the common features of Executive Information Systems (EIS) and the balanced scorecard application in the exploi...

  10. Analysis and design of networked control systems

    CERN Document Server

    You, Keyou; Xie, Lihua

    2015-01-01

    This monograph focuses on characterizing the stability and performance consequences of inserting limited-capacity communication networks within a control loop. The text shows how integration of the ideas of control and estimation with those of communication and information theory can be used to provide important insights concerning several fundamental problems such as: ·         minimum data rate for stabilization of linear systems over noisy channels; ·         minimum network requirement for stabilization of linear systems over fading channels; and ·         stability of Kalman filtering with intermittent observations. A fundamental link is revealed between the topological entropy of linear dynamical systems and the capacities of communication channels. The design of a logarithmic quantizer for the stabilization of linear systems under various network environments is also extensively discussed and solutions to many problems of Kalman filtering with intermittent observations are de...

  11. Magnetic field regulation control system analysis

    Energy Technology Data Exchange (ETDEWEB)

    Badelt, S.W. [Lawrence Livremore National Lab., CA (United States)

    1996-05-01

    This study comprises (1) an analytical characterization of the Cameca ion microscope`s magnetic field regulation circuitry and (2) comparisons between the analytical predictions and the measured performance of the control system. It is the first step in a project to achieve routine field regulation better than 10ppm. The control loop was decomposed into functional subcircuits and simulated in SPICE to determine DC, AC, and transient response. Transfer functions were extracted from SPICE, simplified, and analyzed in MATLAB. Both SPICE and MATLAB simulations were calculated for step inputs, and these results were compared to actual measurements. Magnetic field fluctuations were measured at high mass resolving power. The frequency spectrum of the fluctuations was analyzed by FFT. Difficulties encountered and implications for future work are discussed.

  12. Cognitive Task Analysis of Prioritization in Air Traffic Control.

    Science.gov (United States)

    Redding, Richard E.; And Others

    A cognitive task analysis was performed to analyze the key cognitive components of the en route air traffic controllers' jobs. The goals were to ascertain expert mental models and decision-making strategies and to identify important differences in controller knowledge, skills, and mental models as a function of expertise. Four groups of…

  13. Updated Meta-Analysis of Learner Control within Educational Technology

    Science.gov (United States)

    Karich, Abbey C.; Burns, Matthew K.; Maki, Kathrin E.

    2014-01-01

    Giving a student control over their learning has theoretical and intuitive appeal, but its effects are neither powerful nor consistent in the empirical literature base. This meta-analysis updated previous meta-analytic research by Niemiec, Sikorski, and Walberg by studying the overall effectiveness of providing learner control within educational…

  14. Robot Manipulators: Modeling, Performance Analysis and Control

    OpenAIRE

    Dombre, Etienne; Khalil, Wisama

    2007-01-01

    This book presents the most recent research results about the modeling and control of robot manipulators. - Chapter 1 gives unified tools to derive direct and inverse geometric, kinematic and dynamic models of serial robots and addresses the issue of identification of the geometric and dynamic parameters of these models. - Chapter 2 describes the main features of parallel robots, the different architectures and the methods used to obtain direct and inverse geometric, kinematic and dynamic mod...

  15. PID control system analysis, design, and technology

    OpenAIRE

    Ang, K.H.; Chong, G.C.Y.; Li, Y.

    2005-01-01

    Designing and tuning a proportional-integral-derivative (PID) controller appears to be conceptually intuitive, but can be hard in practice, if multiple (and often conflicting) objectives such as short transient and high stability are to be achieved. Usually, initial designs obtained by all means need to be adjusted repeatedly through computer simulations until the closed-loop system performs or compromises as desired. This stimulates the development of "intelligent" tools...

  16. Morphological Component Analysis and Inpainting on the sphere : Application in Physics and Astrophysics

    OpenAIRE

    Abrial, P.; Moudden, Y.(CEA, Irfu/Sedi, Centre de Saclay, Gif-sur-Yvette, France); Starck, J.-L.; Afeyan, B.; Bobin, J.; Nguyen, Maï K.; Fadili, Jalal

    2007-01-01

    Morphological Component Analysis (MCA) is a new method which takes advantage of the sparse representation of structured data in large overcomplete dictionaries to separate features in the data based on the diversity of their morphology. It is an efficient technique in such problems as separating an image into texture and piecewise smooth parts or for inpainting applications. The MCA algorithm consists of an iterative alternating projection and thresholding scheme, using a successively decreas...

  17. Contamination control - the analysis of things as they should be

    International Nuclear Information System (INIS)

    Contamination can be controlled in chemical analyses by the use of suitable containers, cleanliness, appropriate apparatus design, isolation of the analysis process from air, and in-situ analysis. Examples based on analyses of organic reactor coolant, metals, and underground natural waters are given. (LL)

  18. Discontinuous control systems frequency-domain analysis and design

    CERN Document Server

    Boiko, Igor

    2008-01-01

    This book provides new insight on the problem of closed-loop performance and oscillations in discontinuous control systems, covering the class of systems that do not necessarily have low-pass filtering properties. The author provides a practical, yet rigorous and exact approach to analysis and design of discontinuous control systems via application of a novel frequency-domain tool: the locus of a perturbed relay system. Presented are a number of practical examples applying the theory to analysis and design of discontinuous control systems from various branches of engineering, including electro

  19. Power system small signal stability analysis and control

    CERN Document Server

    Mondal, Debasish; Sengupta, Aparajita

    2014-01-01

    Power System Small Signal Stability Analysis and Control presents a detailed analysis of the problem of severe outages due to the sustained growth of small signal oscillations in modern interconnected power systems. The ever-expanding nature of power systems and the rapid upgrade to smart grid technologies call for the implementation of robust and optimal controls. Power systems that are forced to operate close to their stability limit have resulted in the use of control devices by utility companies to improve the performance of the transmission system against commonly occurring power system

  20. Dynamic analysis of hydraulic control unit

    International Nuclear Information System (INIS)

    The Hydraulic Control Units (HCU) are required to operate when the required response spectra (RRS) corresponding to dynamic loads of upset and faulted conditions are applied to the HCU's. To demonstrate operability, they are qualified to testing response spectra (TRS). This paper presents a procedure by which the RRS and TRS were generated at the upper HCU connecting locations and also the selected locations. A comparison of the RRS and TRS shows that the RRS are indeed enveloped by the TRS at the mounting locations as well as at the floor. Thus, the use of the HCU test results to qualify the HCU in the actual installation is justified. (orig.)

  1. A Calculus for Control Flow Analysis of Security Protocols

    DEFF Research Database (Denmark)

    Buchholtz, Mikael; Nielson, Hanne Riis; Nielson, Flemming

    2004-01-01

    The design of a process calculus for anaysing security protocols is governed by three factors: how to express the security protocol in a precise and faithful manner, how to accommodate the variety of attack scenarios, and how to utilise the strengths (and limit the weaknesses) of the underlying analysis methodology. We pursue an analysis methodology based on control flow analysis in flow logic style and we have previously shown its ability to analyse a variety of security protocols. This paper d...

  2. Stability Analysis for Car Following Model Based on Control Theory

    International Nuclear Information System (INIS)

    Stability analysis is one of the key issues in car-following theory. The stability analysis with Lyapunov function for the two velocity difference car-following model (for short, TVDM) is conducted and the control method to suppress traffic congestion is introduced. Numerical simulations are given and results are consistent with the theoretical analysis. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

  3. Controllability analysis of modified Petlyuk structures

    Energy Technology Data Exchange (ETDEWEB)

    Tamayo-Galvan, V.E.; Segovia-Hernandez, J.G.; Hernandez, S.; Hernandez, H. [Guanajuato Univ. (Mexico). Faculty of Chemistry

    2008-02-15

    Distillation columns can consume a large portion of energy in chemical industry processes. Integrated Petlyuk columns have been shown to improve energy efficiencies by between 20 and 40 per cent, and thermally coupled distillation columns can serve as an alternative to conventional distillation sequences in multicomponent mixture separation processes. Until recently, operational difficulties have limited the wider introduction of Petlyuk columns in industrial applications. Alternative Petlyuk-type schemes have now been developed to provide improved operation properties. This paper discussed, evaluated, and compared the theoretical control properties of 6 different Petlyuk schemes. Computations were performed using a singular value decomposition (SVD) technique in the frequency domain. Dynamic closed-loop responses for set point tracking, and disturbance rejections were derived in order to support each scheme's theoretical control properties. Results of the comparative evaluation demonstrated that reductions in the number of interconnections and the use of unidirectional flows impacted the dynamic properties of the schemes, and led to operational improvements in thermally coupled distillation sequences. It was concluded that Petyluk properties can be improved through the correction of the bidirectionality of interconnecting streams. 30 refs., 10 tabs., 9 figs.

  4. Regulatory control analysis and design for sewer systems

    DEFF Research Database (Denmark)

    Mollerup, Ane Loft; Mikkelsen, Peter Steen

    2015-01-01

    A systematic methodology for regulatory control analysis and design is adapted for sewer system operation and evaluated. The main challenge with adapting the methodology is the handling of the stochastic and transient nature of the rainfall disturbances, inherent to sewer system operation. To this end, four distinct modes of operation are identified (dry weather, filling, saturation and emptying) and for each of these the process gain matrix is found. Based on the gain matrices a controllability analysis is performed, to screen for suitable pairings between measurements and actuators in the case study area of Copenhagen. The analysis effectively reduces the number of potential controlled variables, by considering the sensitivity of the measurements towards changes in the manipulated variables. Several potential pairings are generated and the best alternative is chosen for closed-loop testing. The methodology is a promising tool for systematic generation of solutions for sewer system control.

  5. Controllable set analysis for planetary landing under model uncertainties

    Science.gov (United States)

    Long, Jiateng; Gao, Ai; Cui, Pingyuan

    2015-07-01

    Controllable set analysis is a beneficial method in planetary landing mission design by feasible entry state selection in order to achieve landing accuracy and satisfy entry path constraints. In view of the severe impact of model uncertainties on planetary landing safety and accuracy, the purpose of this paper is to investigate the controllable set under uncertainties between on-board model and the real situation. Controllable set analysis under model uncertainties is composed of controllable union set (CUS) analysis and controllable intersection set (CIS) analysis. Definitions of CUS and CIS are demonstrated and computational method of them based on Gauss pseudospectral method is presented. Their applications on entry states distribution analysis under uncertainties and robustness of nominal entry state selection to uncertainties are illustrated by situations with ballistic coefficient, lift-to-drag ratio and atmospheric uncertainty in Mars entry. With analysis of CUS and CIS, the robustness of entry state selection and entry trajectory to model uncertainties can be guaranteed, thus enhancing the safety, reliability and accuracy under model uncertainties during planetary entry and landing.

  6. Analysis and Comparison of Access Control Policies Validation Mechanisms

    Directory of Open Access Journals (Sweden)

    Muhammad Aqib

    2014-12-01

    Full Text Available Validation and verification of security policies is a critical and important task to ensure that access control policies are error free. The two most common problems present in access control policies are: inconsistencies and incompleteness. In order to detect such problems, various access control policy validation mechanisms are proposed by the researchers. However, comprehensive analysis and evaluation of the existing access control policy validation techniques is missing in the literature. In this paper, we have provided a first detailed survey of this domain and presented the taxonomy of the access control policy validation mechanisms. Furthermore, we have provided a qualitative comparison and trend analysis of the existing schemes. From this survey, we found that only few validation mechanisms exist that can handle both inconsistency and incompleteness problem. Also, most of the policy validation techniques are inefficient in handling continuous values and Boolean expressions.

  7. Stability Analysis Method for Fuzzy Control Systems Dedicated Controlling Nonlinear Processes

    OpenAIRE

    Marius-Lucian Tomescu; Stefan Preitl; Radu-Emil Precup; József K. Tar

    2007-01-01

    This paper presents a new stability analysis method for nonlinear processes withTakagi-Sugeno (T-S) fuzzy logic controllers (FLCs). The design of the FLCs is based onheuristic fuzzy rules. The stability analysis of these fuzzy control systems is performed usingLaSalle’s invariant set principle with non-quadratic Lyapunov candidate function. Thispaper proves that if the derivative of Lyapunov function is negative semi-definite in theactive region of each fuzzy rule, then the overall system wil...

  8. Performance Analysis and FPGA Implementation of Digital PID Controller for Speed Control of DC Motor

    Directory of Open Access Journals (Sweden)

    Charul Agarwal

    2013-06-01

    Full Text Available This paper deals with the performance analysis and implementation of PID(Proportional-Integral-Derivative Controller on FPGA platform.The hardware implementation has been done on Xilinx Spartan 3E FPGA board.The software implementation has been done using Xilinx ISE 8.1i as a tool and simulation is performed using ModelSim 5.4a as a simulator.The PWM signal is generated by FPGA board,which further given to dc motor for its speed control. A new technique has been introduced for the generation of the control input as a PWM signal for controlling the motor driver circuit and decoding the optical encoder data for using it for the speed feedback in the PID control loop. The VHDL algorithm for the proposed implementation has been presented in this paper. Performance analysis of PID controller using MATLAB software shows the effectiveness of the proposed method.

  9. REVIEW OF NRC APPROVED DIGITAL CONTROL SYSTEMS ANALYSIS

    Energy Technology Data Exchange (ETDEWEB)

    D.W. Markman

    1999-09-17

    Preliminary design concepts for the proposed Subsurface Repository at Yucca Mountain indicate extensive reliance on modern, computer-based, digital control technologies. The purpose of this analysis is to investigate the degree to which the U. S. Nuclear Regulatory Commission (NRC) has accepted and approved the use of digital control technology for safety-related applications within the nuclear power industry. This analysis reviews cases of existing digitally-based control systems that have been approved by the NRC. These cases can serve as precedence for using similar types of digitally-based control technologies within the Subsurface Repository. While it is anticipated that the Yucca Mountain Project (YMP) will not contain control systems as complex as those required for a nuclear power plant, the review of these existing NRC approved applications will provide the YMP with valuable insight into the NRCs review process and design expectations for safety-related digital control systems. According to the YMP Compliance Program Guidance, portions of various NUREGS, Regulatory Guidelines, and nuclear IEEE standards the nuclear power plant safety related concept would be applied to some of the designs on a case-by-case basis. This analysis will consider key design methods, capabilities, successes, and important limitations or problems of selected control systems that have been approved for use in the Nuclear Power industry. An additional purpose of this analysis is to provide background information in support of further development of design criteria for the YMP. The scope and primary objectives of this analysis are to: (1) Identify and research the extent and precedence of digital control and remotely operated systems approved by the NRC for the nuclear power industry. Help provide a basis for using and relying on digital technologies for nuclear related safety critical applications. (2) Identify the basic control architecture and methods of key digital control systems approved for use in the nuclear power industry by the NRC. (3) Identify and discuss key design issues, features, benefits, and limitations of these NRC approved digital control systems that can be applied as design guidance and correlated to the Monitored Geologic Repository (MGR) design requirements. (4) Identify codes and standards used in the design of these NRC approved digital control systems and discuss their possible applicability to the design of a subsurface nuclear waste repository. (5) Evaluate the NRC approved digital control system's safety, reliability and maintainability features and issues. Apply these to MGR design methodologies and requirements. (6) Provide recommendations for use in developing design criteria in the System Description Documents for the digital control systems of the subsurface nuclear waste repository at Yucca Mountain. (7) Develop recommendations for applying NRC approval methods for digital control systems for the subsurface nuclear waste repository at Yucca Mountain. This analysis will focus on the development of the issues, criteria and methods used and required for identifying the appropriate requirements for digital based control systems. Attention will be placed on development of recommended design criteria for digital controls including interpretation of codes, standards and regulations. Attention will also focus on the use of digital controls and COTS (Commercial Off-the-shelf) technology and equipment in selected NRC approved digital control systems, and as referenced in applicable codes, standards and regulations. The analysis will address design issues related to COTS technology and how they were dealt with in previous NRC approved digital control systems.

  10. REVIEW OF NRC APPROVED DIGITAL CONTROL SYSTEMS ANALYSIS

    International Nuclear Information System (INIS)

    Preliminary design concepts for the proposed Subsurface Repository at Yucca Mountain indicate extensive reliance on modern, computer-based, digital control technologies. The purpose of this analysis is to investigate the degree to which the U. S. Nuclear Regulatory Commission (NRC) has accepted and approved the use of digital control technology for safety-related applications within the nuclear power industry. This analysis reviews cases of existing digitally-based control systems that have been approved by the NRC. These cases can serve as precedence for using similar types of digitally-based control technologies within the Subsurface Repository. While it is anticipated that the Yucca Mountain Project (YMP) will not contain control systems as complex as those required for a nuclear power plant, the review of these existing NRC approved applications will provide the YMP with valuable insight into the NRCs review process and design expectations for safety-related digital control systems. According to the YMP Compliance Program Guidance, portions of various NUREGS, Regulatory Guidelines, and nuclear IEEE standards the nuclear power plant safety related concept would be applied to some of the designs on a case-by-case basis. This analysis will consider key design methods, capabilities, successes, and important limitations or problems of selected control systems that have been approved for use in the Nuclear Power industry. An additional purpose of this analysis is to provide background information in support of further development of design criteria for the YMP. The scope and primary objectives of this analysis are to: (1) Identify and research the extent and precedence of digital control and remotely operated systems approved by the NRC for the nuclear power industry. Help provide a basis for using and relying on digital technologies for nuclear related safety critical applications. (2) Identify the basic control architecture and methods of key digital control systems approved for use in the nuclear power industry by the NRC. (3) Identify and discuss key design issues, features, benefits, and limitations of these NRC approved digital control systems that can be applied as design guidance and correlated to the Monitored Geologic Repository (MGR) design requirements. (4) Identify codes and standards used in the design of these NRC approved digital control systems and discuss their possible applicability to the design of a subsurface nuclear waste repository. (5) Evaluate the NRC approved digital control system's safety, reliability and maintainability features and issues. Apply these to MGR design methodologies and requirements. (6) Provide recommendations for use in developing design criteria in the System Description Documents for the digital control systems of the subsurface nuclear waste repository at Yucca Mountain. (7) Develop recommendations for applying NRC approval methods for digital control systems for the subsurface nuclear waste repository at Yucca Mountain. This analysis will focus on the development of the issues, criteria and methods used and required for identifying the appropriate requirements for digital based control systems. Attention will be placed on development of recommended design criteria for digital controls including interpretation of codes, standards and regulations. Attention will also focus on the use of digital controls and COTS (Commercial Off-the-shelf) technology and equipment in selected NRC approved digital control systems, and as referenced in applicable codes, standards and regulations. The analysis will address design issues related to COTS technology and how they were dealt with in previous NRC approved digital control systems

  11. Task analysis methods applicable to control room design review (CDR)

    International Nuclear Information System (INIS)

    This report presents the results of a research study conducted in support of the human factors engineering program of the Atomic Energy Control Board in Canada. It contains five products which may be used by the Atomic Enegy Control Board in relation to Task Analysis of jobs in CANDU nuclear power plants: 1. a detailed method for preparing for a task analysis; 2. a Task Data Form for recording task analysis data; 3. a detailed method for carrying out task analyses; 4. a guide to assessing alternative methods for performing task analyses, if such are proposed by utilities or consultants; and 5. an annotated bibliography on task analysis. In addition, a short explanation of the origins, nature and uses of task analysis is provided, with some examples of its cost effectiveness. 35 refs

  12. Shock analysis on hydraulic drive control rod during scram

    International Nuclear Information System (INIS)

    Control rod hydraulic drive mechanism (CRHDM) is a new invention of Institute of Nuclear and New Energy Technology of Tsinghua University. The hydraulic absorber buffers the control rod when it scrams. The control rod fast drop impact experiment was conducted and the key parameters of control rod hydraulic buffering performance were obtained. Based on the test results and according to D'Alembert principle, the maximum inertial impact force on the control rod during the fast drop period was applied as equivalent static load force on the control rod. The deformations and stress distributions on the control rod in this worst case were calculated by using finite element software ABAQUS. Calculation results were compared with the experiment results, and it was verified that nonlinear transient dynamics analysis in this problem can be simplified as static analysis. Damage criterion of the control rod fast drop impact process was also given. And it lays foundation for optimal design of the control rod and hydraulic absorber. (authors)

  13. Influence of Vitamin E Supplementation on Glycaemic Control: A Meta-Analysis of Randomised Controlled Trials

    OpenAIRE

    Xu, Renfan; Zhang, Shasha; Tao, Anyu; Chen, Guangzhi; Zhang, Muxun

    2014-01-01

    Observational studies have revealed that higher serum vitamin E concentrations and increased vitamin E intake and vitamin E supplementation are associated with beneficial effects on glycaemic control in type 2 diabetes mellitus (T2DM). However, whether vitamin E supplementation exerts a definitive effect on glycaemic control remains unclear. This article involves a meta-analysis of randomised controlled trials of vitamin E to better characterise its impact on HbA1c, fasting glucose and fastin...

  14. Design and Analysis of Morpheus Lander Flight Control System

    Science.gov (United States)

    Jang, Jiann-Woei; Yang, Lee; Fritz, Mathew; Nguyen, Louis H.; Johnson, Wyatt R.; Hart, Jeremy J.

    2014-01-01

    The Morpheus Lander is a vertical takeoff and landing test bed vehicle developed to demonstrate the system performance of the Guidance, Navigation and Control (GN&C) system capability for the integrated autonomous landing and hazard avoidance system hardware and software. The Morpheus flight control system design must be robust to various mission profiles. This paper presents a design methodology for employing numerical optimization to develop the Morpheus flight control system. The design objectives include attitude tracking accuracy and robust stability with respect to rigid body dynamics and propellant slosh. Under the assumption that the Morpheus time-varying dynamics and control system can be frozen over a short period of time, the flight controllers are designed to stabilize all selected frozen-time control systems in the presence of parametric uncertainty. Both control gains in the inner attitude control loop and guidance gains in the outer position control loop are designed to maximize the vehicle performance while ensuring robustness. The flight control system designs provided herein have been demonstrated to provide stable control systems in both Draper Ares Stability Analysis Tool (ASAT) and the NASA/JSC Trick-based Morpheus time domain simulation.

  15. A new TXRF vacuum chamber with sample changer for chemical analysis using silicon drift chamber detector

    International Nuclear Information System (INIS)

    Full text: Several TXRF spectrometers for chemical analysis as well as for wafer surface analysis are commercially available. But there is no one available for chemical analysis offering the possibility to measure the samples in vacuum conditions. Vacuum of 10-2 mbar in the sample environment helps to reduce the background due to scattering from air, thus to improve the detection limits as well as to reduce the absorption of low energy fluorescence radiation from low Z elements and extend the elemental range to be measured and removes the Ar lines from the spectrum. The x-ray group of the Atominstitut designed and fabricated a new vacuum chamber for TXRF equipped with a 12 position sample changer from Italstructures, Riva, Italy. The detector used was a 10 mm2 silicon drift detector (KETEK, Munich, Germany), offering the advantage of electrically cooling, so no LN2 is required. The chamber was designed to be attached to a diffraction tube housing, e.g. with a fine focus Mo-x-ray tube and uses a multilayer monochromator. Spectra are stored by a small AMTEK MCA and control between sample changer and MCA communication is done by a modified AMPTEK software. The performance is expressed in detection limits of 1 pg Rb for Mo Ka excitation with 50 kV, 40 mA excitation conditions, 1000 s lifetime, obtained from a sample containing 600 pg Rb as single element standard. Details on performance, reproducibility and light element excitation and detection are presented. (author)

  16. An Entry Flight Controls Analysis for a Reusable Launch Vehicle

    Science.gov (United States)

    Calhoun, Philip

    2000-01-01

    The NASA Langley Research Center has been performing studies to address the feasibility of various single-stage to orbit concepts for use by NASA and the commercial launch industry to provide a lower cost access to space. Some work on the conceptual design of a typical lifting body concept vehicle, designated VentureStar(sup TM) has been conducted in cooperation with the Lockheed Martin Skunk Works. This paper will address the results of a preliminary flight controls assessment of this vehicle concept during the atmospheric entry phase of flight. The work includes control analysis from hypersonic flight at the atmospheric entry through supersonic speeds to final approach and landing at subsonic conditions. The requirements of the flight control effectors are determined over the full range of entry vehicle Mach number conditions. The analysis was performed for a typical maximum crossrange entry trajectory utilizing angle of attack to limit entry heating and providing for energy management, and bank angle to modulation of the lift vector to provide downrange and crossrange capability to fly the vehicle to a specified landing site. Sensitivity of the vehicle open and closed loop characteristics to CG location, control surface mixing strategy and wind gusts are included in the results. An alternative control surface mixing strategy utilizing a reverse aileron technique demonstrated a significant reduction in RCS torque and fuel required to perform bank maneuvers during entry. The results of the control analysis revealed challenges for an early vehicle configuration in the areas of hypersonic pitch trim and subsonic longitudinal controllability.

  17. [Import risk analysis in animal disease control].

    Science.gov (United States)

    Hauser, Ruth; Breidenbach, Eric; Thür, Barbara; Griot, Christian; Engels, Monika; Stärk, Katharina

    2004-01-01

    At the Swiss Federal Veterinary Office risk analyses are conducted according to international standards. A risk analysis contains the elements risk management, risk assessment and risk communication. A risk assessment is based on risk profile, hazard identification and a pathway model. All available information is gathered, documented and assessed and the risk estimated. The question. "What is the probability that unprocessed wild boar meat imported to Switzerland from the federal state Mecklenburg Western Pommerania is contaminated with classical swine fever virus?" was answered by a release assessment. The hazard identification recognized classical swine fever virus and attenuated live virus vaccine used for oral immunization as hazards. The probability of contamination was estimated to be small. The question: "What is the likelihood to introduce Aujeszky's disease to Switzerland and infect the indigenous pig population with the disease, by means of importing pork and meat products?" was answered by assessing the release, exposure and resulting consequences. The risk of an infection of the indigenous pig population was estimated to be very small, as 80% of the imported products derive from countries or zones free from Aujeszky's disease. Furthermore the majority of the imported products are processed. The strict implementation of the regulations governing feeding of food wastes to pigs reduces the probability of exposure. In all assessments the risk management decides on a strategy to deal with the risk, taking into consideration the results and recommendations derived from the risk assessment as well as other relevant factors. PMID:15188677

  18. Chernobyl: The super MCA

    International Nuclear Information System (INIS)

    The publication abstracted informs on the following most topical questions: What are the short-term and long-term effects of radioactive radiation on man. What is the genetic damage to be expected. Radiation doses and how to calculate them. Immediate and present radiation effects of Chernobyl. What can the consumer do to protect himself and his environment. Nuclear power phase out: is it really as difficult as is often maintained. Does it involve insurmountable legal problems. What are the rights of the individual in case of a reactor catastrophe. The publication abstracted reflects the work of members of the environmental organization ''Bund fuer Umwelt und Naturschutz Deutschland'' (BUND) of the Federal Republic of Germany. It is not the result of hasty, precipitate contributions but is based on facts and on profound analyses. The reader may resort to references along with comprehensive commentaries. (orig./HP)

  19. Supercritical carbon dioxide cycle control analysis

    International Nuclear Information System (INIS)

    This report documents work carried out during FY 2008 on further investigation of control strategies for supercritical carbon dioxide (S-CO2) Brayton cycle energy converters. The main focus of the present work has been on investigation of the S-CO2 cycle control and behavior under conditions not covered by previous work. An important scenario which has not been previously calculated involves cycle operation for a Sodium-Cooled Fast Reactor (SFR) following a reactor scram event and the transition to the primary coolant natural circulation and decay heat removal. The Argonne National Laboratory (ANL) Plant Dynamics Code has been applied to investigate the dynamic behavior of the 96 MWe (250 MWt) Advanced Burner Test Reactor (ABTR) S-CO2 Brayton cycle following scram. The timescale for the primary sodium flowrate to coast down and the transition to natural circulation to occur was calculated with the SAS4A/SASSYS-1 computer code and found to be about 400 seconds. It is assumed that after this time, decay heat is removed by the normal ABTR shutdown heat removal system incorporating a dedicated shutdown heat removal S-CO2 pump and cooler. The ANL Plant Dynamics Code configured for the Small Secure Transportable Autonomous Reactor (SSTAR) Lead-Cooled Fast Reactor (LFR) was utilized to model the S-CO2 Brayton cycle with a decaying liquid metal coolant flow to the Pb-to-CO2 heat exchangers and temperatures reflecting the decaying core power and heat removal by the cycle. The results obtained in this manner are approximate but indicative of the cycle transient performance. The ANL Plant Dynamics Code calculations show that the S-CO2 cycle can operate for about 400 seconds following the reactor scram driven by the thermal energy stored in the reactor structures and coolant such that heat removal from the reactor exceeds the decay heat generation. Based on the results, requirements for the shutdown heat removal system may be defined. In particular, the peak heat removal capacity of the shutdown heat removal loop may be specified to be 1.1 % of the nominal reactor power. An investigation of the oscillating cycle behavior calculated by the ANL Plant Dynamics Code under specific conditions has been carried out. It has been found that the calculation of unstable operation of the cycle during power reduction to 0 % may be attributed to the modeling of main compressor operation. The most probable reason for such instabilities is the limit of applicability of the currently used one-dimensional compressor performance subroutines which are based on empirical loss coefficients. A development of more detailed compressor design and performance models is required and is recommended for future work in order to better investigate and possibly eliminate the calculated instabilities. Also, as part of such model development, more reliable surge criteria should be developed for compressor operation close to the critical point. It is expected that more detailed compressor models will be developed as a part of validation of the Plant Dynamics Code through model comparison with the experiment data generated in the small S-CO2 loops being constructed at Barber-Nichols Inc. and Sandia National Laboratories (SNL). Although such a comparison activity had been planned to be initiated in FY 2008, data from the SNL compression loop currently in operation at Barber Nichols Inc. has not yet become available by the due date of this report. To enable the transient S-CO2 cycle investigations to be carried out, the ANL Plant Dynamics Code for the S-CO2 Brayton cycle was further developed and improved. The improvements include further optimization and tuning of the control mechanisms as well as an adaptation of the code for reactor systems other than the Lead-Cooled Fast Reactor (LFR). Since the focus of the ANL work on S-CO2 cycle development for the majority of the current year has been on the applicability of the cycle to SFRs, work has started on modification of the ANL Plant Dynamics Code to allow the dynamic simulation of the ABTR. The code modifications have r

  20. Moving shape analysis and control applications to fluid structure interactions

    CERN Document Server

    Moubachir, Marwan

    2006-01-01

    Problems involving the evolution of two- and three-dimensional domains arise in many areas of science and engineering. Emphasizing an Eulerian approach, Moving Shape Analysis and Control: Applications to Fluid Structure Interactions presents valuable tools for the mathematical analysis of evolving domains. The book illustrates the efficiency of the tools presented through different examples connected to the analysis of noncylindrical partial differential equations (PDEs), such as Navier-Stokes equations for incompressible fluids in moving domains. The authors first provide all of the details of existence and uniqueness of the flow in both strong and weak cases. After establishing several important principles and methods, they devote several chapters to demonstrating Eulerian evolution and derivation tools for the control of systems involving fluids and solids. The book concludes with the boundary control of fluid-structure interaction systems, followed by helpful appendices that review some of the advanced m...

  1. Thermal-structural analysis of electron gun with control grid.

    Science.gov (United States)

    Yao, Lieming; Zhang, Kai; Yu, Hailong; Huang, Tao; Li, Bin

    2012-02-01

    Steady state thermal-structural analysis of electron guns is essential due to the requirement of high reliability in beam performance. Temperatures and displacements for all the components of an electron gun with a control grid are computed. Steady-state thermal analysis has been carried out for various cathode temperatures and various intercepted powers on the control grid to determine the temperature of the control grid. These results are verified experimentally based on measured results from an assembled electron gun. Structural analysis of the electron gun is used to evaluate the deformation of the inner electrodes under the hot condition. The results show that the thermal stress slightly changes the characteristics of the gun. The obtained thermal deformation data can be helpful to modify the design dimensions and assembly of an electron gun. PMID:22380107

  2. REACTOR ANALYSIS AND VIRTUAL CONTROL ENVIRONMENT (RAVEN) FY12 REPORT

    Energy Technology Data Exchange (ETDEWEB)

    Cristian Rabiti; Andrea Alfonsi; Joshua Cogliati; Diego Mandelli; Robert Kinoshita

    2012-09-01

    RAVEN is a complex software tool that will have tasks spanning from being the RELAP-7 user interface, to using RELAP-7 to perform Risk Informed Safety Characterization (RISMC), and to controlling RELAP-7 calculation execution. The goal of this document is to: 1. Highlight the functional requirements of the different tasks of RAVEN 2. Identify shared functions that could be aggregate in modules so to obtain a minimal software redundancy and maximize software utilization. RAVEN is in fact a software framework that will allow exploiting the following functionalities: • Derive and actuate the control logic required to: o Simulate the plant control system o Simulate the operator (procedure guided) actions o Perform Monte Carlo sampling of random distributed events o Perform event three based analysis • Provide a GUI to: o Input a plant description to RELAP-7 (component, control variable, control parameters) o Concurrent monitoring of Control Parameters o Concurrent alteration of control parameters • Provide Post Processing data mining capability based on o Dimensionality reduction o Cardinality reduction In this document it will be shown how an appropriate mathematical formulation of the control logic and probabilistic analysis leads to have most of the software infrastructure leveraged between the two main tasks. Further, this document will go through the development accomplished this year, including simulation results, and priorities for the next years development

  3. Effect of the A-site cation on methane oxidation of perovskite-type (La1?xMx)CoO3 (M=Ca, Sr, and Ba)

    International Nuclear Information System (INIS)

    Perovskite-type (La1?xMx)CoO3 (M=Ca, Sr, and Ba) synthesized at 700 °C in air using the polymerizable complex method had a rhombohedral perovskite-type structure in the range of x?0.06. The oxygen content of the samples was 2.98–2.99, and the specific surface area was 3.5–8.3 m2/g regardless of the M ion or x. The Rietveld method indicated that the Co–O distance was also constant regardless of the M ion or x, and that the Co–O–Co angle between two CoO6 octahedra increased with an increase in the ionic radius of the M ion. The temperature corresponding to the 50% conversion (T1/2) of CH4 oxidation was almost constant for the samples with x=0.04, while the T1/2 of the samples with x=0.06 was linearly lowered with increases in the ionic radius of the M ion. - Graphical abstract: The conversion from CH4 to CO2 and H2O on (La0.94M0.06)CoO3 (M=Ca, Sr, and Ba). Highlights: ? (La1?xMx)CoO3 (M=Ca, Sr, and Ba) was synthesized using the polymerizable complex method. ? The Co–O distance was constant regardless of the M ion or x. ? The Co–O–Co angle increased with an increase in the ionic radius of the M ion. ? CH4 oxidation started above 300 °C and finished at 700 °C. ? The catalytic activity increased with increases in the ionic radius of the M ion.

  4. Experimental Bifurcation Analysis By Control-based Continuation - Determining Stability’

    DEFF Research Database (Denmark)

    Bureau, Emil; Santos, Ilmar; Thomsen, Jon Juel; Schilder, Frank; Starke, Jens

    2012-01-01

    The newly developed control-based continuation technique has made it possible to perform experimental bifurcation analysis, e.g. to track stable as well as unstable branches of frequency responses directly in experiments. The method bypasses mathematical models, and systematically explores how vibration characteristics of dynamical systems change under variation of parameters. The method employs a control scheme to modify the response stability. While this facilitates exploration of the unstable...

  5. Regulatory control analysis and design for sewer systems

    DEFF Research Database (Denmark)

    Mollerup, Ane Loft; Mikkelsen, Peter Steen; Thornberg, Dines; Sin, Gürkan

    2015-01-01

    A systematic methodology for regulatory control analysis and design is adapted for sewer system operation and evaluated. The main challenge with adapting the methodology is the handling of the stochastic and transient nature of the rainfall disturbances, inherent to sewer system operation. To this end, four distinct modes of operation are identified (dry weather, filling, saturation and emptying) and for each of these the process gain matrix is found. Based on the gain matrices a controllability...

  6. Facilitator control as automatic behavior: A verbal behavior analysis

    OpenAIRE

    Hall, Genae A.

    1993-01-01

    Several studies of facilitated communication have demonstrated that the facilitators were controlling and directing the typing, although they appeared to be unaware of doing so. Such results shift the focus of analysis to the facilitator's behavior and raise questions regarding the controlling variables for that behavior. This paper analyzes facilitator behavior as an instance of automatic verbal behavior, from the perspective of Skinner's (1957) book Verbal Behavior. Verbal behavior is autom...

  7. FuzzyCAT - Towards a mathematical analysis of fuzzy controllers

    OpenAIRE

    Forsman, Krister; Stenman, Anders; Strömberg, Jan-Erik

    1993-01-01

    The aim of this paper is to show that contrary to what is commonly believed it is possible to get rather simple analytic expressions for a class of so called fuzzy controllers and to describe a Maple package called FuzzyCAT to support analysis and simulation of fuzzy controllers The restrictions made in the program concern the shape of the membership functions the defuzzication methods available and the number of input and output variables

  8. Analysis of Droop Controlled Parallel Inverters in Islanded Microgrids

    DEFF Research Database (Denmark)

    Mariani, Valerio; Vasca, Francesco; Guerrero, Josep M.

    2014-01-01

    Three-phase droop controlled inverters are widely used in islanded microgrids to interface distributed energy resources and to provide for the loads active and reactive powers demand. The assessment of microgrids stability, affected by the control and line parameters, is a stringent issue. This paper shows a systematic approach to derive a closed loop model of the microgrid and then to perform an eigenvalues analysis that highlights how the system’s parameters affect the stability of the network...

  9. Reliability analysis of the ventilation control system in CEFR

    International Nuclear Information System (INIS)

    This paper describes the function and structure of airiness control system in CEFR. In this paper, based on FMEA and FTA, the reliability of the ventilation control system of CEFR was analyzed. The quantitative analysis and calculation about the fault tree, with the failure rate of fault tree and minimal cut sets are obtained. The data obtained are useful to support the management of the ventilation system of CEFR. (author)

  10. Multi-intersection Traffic Light Control Using Infinitesimal Perturbation Analysis

    OpenAIRE

    Geng, Yanfeng; Cassandras, Christos G.

    2012-01-01

    We address the traffic light control problem for multiple intersections in tandem by viewing it as a stochastic hybrid system and developing a Stochastic Flow Model (SFM) for it. Using Infinitesimal Perturbation Analysis (IPA), we derive on-line gradient estimates of a cost metric with respect to the controllable green and red cycle lengths. The IPA estimators obtained require counting traffic light switchings and estimating car flow rates only when specific events occur. Th...

  11. Decentralized, cooperative control of multivehicle systems: Design and stability analysis

    Science.gov (United States)

    Weitz, Lesley Anne

    2009-12-01

    This dissertation addresses the design and stability analysis of decentralized, cooperative control laws for multivehicle systems. Advances in communication, navigation, and surveillance systems have enabled greater autonomy in multivehicle systems, and there is a shift toward decentralized, cooperative systems for computational efficiency and robustness. In a decentralized control scheme, control inputs are determined onboard each vehicle; therefore, decentralized controllers are more efficient for large numbers of vehicles, and the system is more robust to communication failures and reconfiguration. The design of decentralized, cooperative control laws is explored for a nonlinear vehicle model that can be represented in a double-integrator form. Cooperative controllers are functions of spacing errors with respect to other vehicles in the system, where the communication structure defines the information that is available to each vehicle. Control inputs are selected to achieve internal stability, or zero steady-state spacing errors, between vehicles in the system. Closed-loop equations of motion for the cooperative system can be written in a structural form, where damping and stiffness matrices contain control gains acting on the velocity and positions of the vehicles, respectively. The form of the stiffness matrix is determined by the communication structure, where different communication structures yield different control forms. Communication structures are compared using two structural analysis tools: modal cost and frequency-response functions, which evaluate the response of the multivehicle systems to disturbances. The frequency-response information is shown to reveal the string stability of different cooperative control forms. The effects of time delays in the feedback states of the cooperative control laws on system stability are also investigated. Closed-loop equations of motion are modeled as delay differential equations, and two stability notions are presented: delay-independent and delay-dependent stability. Lastly, two additional cooperative control forms are investigated. The first control form spaces vehicles along an arbitrary path, where distances between vehicles are constant for a given spacing parameter. This control form shows advantages over spacing vehicles using control laws designed in an inertial frame. The second control form employs a time-based spacing scheme, which spaces vehicles at constant-time intervals at a desired endpoint. The stability of these control forms is presented.

  12. THE IMPLICATIONS OF BUDGETARY CONTROL IN BUSINESS PERFORMANCE ANALYSIS

    Directory of Open Access Journals (Sweden)

    ZEFINESCU CARMEN-VERONICA

    2014-05-01

    Full Text Available The article presents the role of budgetary control in the detection and analysis of deviations from the budget, by comparing the results with the expected situation. The specialized literature presents several models for the analysis of deviations from budgeted values. Budgetary management of the company includes all the levels of management, the company’s goals and also goals achievement. Budgeting involves management responsibilities, and approval of the budget allows to accomplish all the activities included. The company's budget system and budget execution control should lead to increased business performance and saving available resources.

  13. Synthesis and luminescence properties of glass ceramics containing MSiO{sub 3}:Eu{sup 2+} (M=Ca, Sr, Ba) phosphors for white LED

    Energy Technology Data Exchange (ETDEWEB)

    Cui Zhiguang; Jia Guohua; Deng Degang; Hua Youjie; Zhao Shilong; Huang Lihui; Wang Huanping [College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018 (China); Ma Hongping [School of Mechanical and Automotive Engineering, Zhejiang University of Science and Technology, Hangzhou 310012 (China); Xu Shiqing, E-mail: sxucjlu@hotmail.com [College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018 (China)

    2012-01-15

    Eu{sup 2+} doped silicate glasses were prepared of the system 52SiO{sub 2}-48MO: xEu{sup 2+}(in molar ratio, M=Ca, Sr, Ba; x=1, 3, 5, 7, 9) by a high temperature melt-quenching method in a reducing atmosphere. Glass ceramics containing MSiO{sub 3}:Eu{sup 2+}(M=Ca, Sr, Ba) nano-phosphors were obtained after the heat treatment of the glass samples. The excitation, emission spectra and lifetime decay curves of 4f{sup 6}5d{sup 1}{yields}4f{sup 7} of Eu{sup 2+} were measured and interpreted with respect to their crystal structures and multi-site occupations of divalent europium in the hosts. Their excitation bands mainly extend from 450 to 250 nm, which is adaptable to the main emission region of the UV LED chip. With UV light excitation, the Eu{sup 2+} emission in CaSiO{sub 3}, SrSiO{sub 3} and BaSiO{sub 3} shows blue, green and yellow colors centered at 440, 505 and 555 nm, respectively. The critical Eu{sup 2+}concentration was studied and determined to be x=5 for both CaSiO{sub 3} and SrSiO{sub 3} and x=7 for BaSiO{sub 3} phosphors. The results show that the Eu{sup 2+} doped glass ceramic phosphors containing MSiO{sub 3} (M=Ca, Sr, Ba) nano-crystals can be used as potential matrix materials for a high power white LED pumped by the UV LED chip. - Highlights: > Glass ceramic containing MSiO{sub 3}:Eu{sup 2+} (M=Ca, Sr, Ba) phosphors prepared. > Derived phosphors emit intensively blue, green and yellow colors. > Their luminescence properties and crystal structures have been investigated. > Concentration quenching effects observed and analyzed. > Potential application for UV chip exciting white LED evaluated.

  14. Parametric model order reduction for structural analysis and control

    OpenAIRE

    Yoo, Eun Jung

    2011-01-01

    The parametric model order reduction (PMOR) method applicable to structural matrices from finite element model is developed for both static and dynamic analysis, so that parameter changes can be directly applied to the reduced model. For the further application, it is used when a large number of analyses subject to parameter changes are required: for instance a design optimization problem. A large reflector model and its shape control are examined as an example of static analysis. An active t...

  15. Methodology for financial analysis and controlling construction projects

    OpenAIRE

    Kuhar, Zoran

    2011-01-01

    The increasing need for efficient monitoring of project costs that derives from poorly predictable construction execution, frequent interruptions of work from the client’s side, poorly defined needs in the design phase, the uncertainty of sales and the current crisis in the construction industry dictates the development of methodology for financial analysis and control to be used during construction project execution. The developed methodology is based on technique of earned value analysis...

  16. Security Analysis of a Wireless Quadruple Tank Control System

    OpenAIRE

    Forment Navarro, Albert

    2011-01-01

    The main emphasis of this Master Thesis is the analysis of the effect of malicious deception attacks applied to a real process, in this case a scale model of a water distribution system made up of four interconnected water tanks and two pumps to control the water levels. The process model is derived, followed by the design and  est of three kinds of controllers: LQG, PI and PI robustified with the Glover-McFarlane method. Later, the performance of the closed loop system with these controllers...

  17. Force analysis of magnetic bearings with power-saving controls

    Science.gov (United States)

    Johnson, Dexter; Brown, Gerald V.; Inman, Daniel J.

    1992-01-01

    Most magnetic bearing control schemes use a bias current with a superimposed control current to linearize the relationship between the control current and the force it delivers. For most operating conditions, the existence of the bias current requires more power than alternative methods that do not use conventional bias. Two such methods are examined which diminish or eliminate bias current. In the typical bias control scheme it is found that for a harmonic control force command into a voltage limited transconductance amplifier, the desired force output is obtained only up to certain combinations of force amplitude and frequency. Above these values, the force amplitude is reduced and a phase lag occurs. The power saving alternative control schemes typically exhibit such deficiencies at even lower command frequencies and amplitudes. To assess the severity of these effects, a time history analysis of the force output is performed for the bias method and the alternative methods. Results of the analysis show that the alternative approaches may be viable. The various control methods examined were mathematically modeled using nondimensionalized variables to facilitate comparison of the various methods.

  18. Autonomous miniaturised device with USB interface for pulse height analysis and multi-channel scaling (TUKAN-8K-USB)

    International Nuclear Information System (INIS)

    We present autonomous a 8K-channel miniature device designed for spectroscopy or intensity vs. time measurements. The device (TUKAN-8K-USB) is based on the USB interface, and is contained in a screened separate box - it can be proved either directly from the USB port or from an external DC source (wall adapter of battery). The device may work in two independent operational modes: Multi-Channel Analysis (MCA) and Multi-Channel Scaling (MCS). The crucial MCA component - Peak detect and Hold circuitry - is featuring a novel architecture based on a diamond transistor. Its analog stage can accept analog pulses with front edges down to 100 ns and has a differential linearity below 0.5% (full scale sliding scale averaging). Automatic stops on count in Region-Of-Interest (ROI) and on preset live or real time are implemented. The MCS works at medium speed counting rates (up to 8 MHz), with preset dwell time, number of channels and multi-sweep mode. Each these parameters can also be controlled externally. Digital interfacing is based on four used configurable logical I/O lines. A single CYCLONE EP1C3 Altera FPGA provides all control functions. The USB communication is based on FYDI FIFO controller. The analyzer is equipped with advanced, user-friendly software, which is subjected of another publication. )author)

  19. Method of Non-optimum Analysis on Risk Control System

    OpenAIRE

    Zengtang Qu; Ping He

    2009-01-01

    This paper discusses in detail the theory of non-optimum analysis on risk management systems. It points out that the main problem of exploring an indefinite system’ optimum lies in the lack of non- optimum analysis on the risk management system. The paper establishes the syndrome and empirical analysis based on the non-optimum category of the risk. At the same time, through the concept of intervenient optimum, it analyzes the actual significance of the optimum of the risk control. Based on no...

  20. Multi Criteria Analysis for bioenergy systems assessments

    International Nuclear Information System (INIS)

    Sustainable bioenergy systems are, by definition, embedded in social, economic, and environmental contexts and depend on support of many stakeholders with different perspectives. The resulting complexity constitutes a major barrier to the implementation of bioenergy projects. The goal of this paper is to evaluate the potential of Multi Criteria Analysis (MCA) to facilitate the design and implementation of sustainable bioenergy projects. Four MCA tools (Super Decisions, DecideIT, Decision Lab, NAIADE) are reviewed for their suitability to assess sustainability of bioenergy systems with a special focus on multi-stakeholder inclusion. The MCA tools are applied using data from a multi-stakeholder bioenergy case study in Uganda. Although contributing to only a part of a comprehensive decision process, MCA can assist in overcoming implementation barriers by (i) structuring the problem, (ii) assisting in the identification of the least robust and/or most uncertain components in bioenergy systems and (iii) integrating stakeholders into the decision process. Applying the four MCA tools to a Ugandan case study resulted in a large variability in outcomes. However, social criteria were consistently identified by all tools as being decisive in making a bioelectricity project viable

  1. Risk analysis in the critical pigmeat control points

    OpenAIRE

    Marin, Ancuta

    2014-01-01

    The pig meat is of particular importance in human food due to the high content of vitamins and minerals. To prevent the hazard of microbial contamination, physical contamination, chemical contamination, etc., before slaughtering and during slaughter of animals has been developed and implemented the system Hazard Analysis by Critical Control Points (HACCP).

  2. Control Flow Analysis for the Pi-calculus

    DEFF Research Database (Denmark)

    Bodei, C.; Degano, P.

    1998-01-01

    Control Flow Analysis is a static technique for predicting safe and computable approximations to the set of values that the objects of a program may assume during its execution. We present an analysis for the pi-calculus that shows how names will be bound to actual channels at run time. The formulation of the analysis requires no extensions to the pi-calculus, except for assigning ``channels'' to the occurrences of names within restrictions, and assigning ``binders'' to the occurrences of names within input prefixes. The result of our analysis establishes a super-set of the set of names to which a given name may be bound and of the set of names that may be sent along a given channel. Applications of our analysis include establishing simple security properties of processes. One example is that P has no leaks, i.e. P offers communication through public channels only, and confines its secret names within itself.

  3. Method of Non-optimum Analysis on Risk Control System

    Directory of Open Access Journals (Sweden)

    Zengtang Qu

    2009-06-01

    Full Text Available This paper discusses in detail the theory of non-optimum analysis on risk management systems. It points out that the main problem of exploring an indefinite system’ optimum lies in the lack of non- optimum analysis on the risk management system. The paper establishes the syndrome and empirical analysis based on the non-optimum category of the risk. At the same time, through the concept of intervenient optimum, it analyzes the actual significance of the optimum of the risk control. Based on non-optimum analysis, it puts out the academic idea of extension risk analysis. At the same time, it also puts forward the non-optimum measurement of the risk system along with non-optimum tracing and self-organization of the risk systems.

  4. Developing standard performance testing procedures for material control and accounting components at a site

    Energy Technology Data Exchange (ETDEWEB)

    Scherer, Carolynn P [Los Alamos National Laboratory; Bushlya, Anatoly V [ROSATOM, RUSSIA; Efimenko, Vladimir F [IPPE, RUSSIA; Ilyanstev, Anatoly [IPPE, RUSSIA; Regoushevsky, Victor I [IPPE, RUSSIA

    2010-01-01

    The condition of a nuclear material control and accountability system (MC&A) and its individual components, as with any system combining technical elements and documentation, may be characterized through an aggregate of values for the various parameters that determine the system's ability to perform. The MC&A system's status may be functioning effectively, marginally or not functioning based on a summary of the values of the individual parameters. This work included a review of the following subsystems, MC&A and Detecting Material Losses, and their respective elements for the material control and accountability system: (a) Elements of the MC&A Subsystem - Information subsystem (Accountancy/Inventory), Measurement subsystem, Nuclear Material Access subsystem, including tamper-indicating device (TID) program, and Automated Information-gathering subsystem; (b) Elements for Detecting Nuclear Material Loses Subsystem - Inventory Differences, Shipper/receiver Differences, Confirmatory Measurements and differences with accounting data, and TID or Seal Violations. In order to detect the absence or loss of nuclear material there must be appropriate interactions among the elements and their respective subsystems from the list above. Additionally this work includes a review of regulatory requirements for the MC&A system component characteristics and criteria that support the evaluation of the performance of the listed components. The listed components had performance testing algorithms and procedures developed that took into consideration the regulatory criteria. The developed MC&A performance-testing procedures were the basis for a Guide for MC&A Performance Testing at the material balance areas (MBAs) of State Scientific Center of the Russian Federation - Institute for Physics and Power Engineering (SSC RF-IPPE).

  5. Chaos in electric drive systems analysis control and application

    CERN Document Server

    Chau, K T

    2011-01-01

    In Chaos in Electric Drive Systems: Analysis, Control and Application authors Chau and Wang systematically introduce an emerging technology of electrical engineering that bridges abstract chaos theory and practical electric drives. The authors consolidate all important information in this interdisciplinary technology, including the fundamental concepts, mathematical modeling, theoretical analysis, computer simulation, and hardware implementation. The book provides comprehensive coverage of chaos in electric drive systems with three main parts: analysis, control and application. Corresponding drive systems range from the simplest to the latest types: DC, induction, synchronous reluctance, switched reluctance, and permanent magnet brushless drives.The first book to comprehensively treat chaos in electric drive systemsReviews chaos in various electrical engineering technologies and drive systemsPresents innovative approaches to stabilize and stimulate chaos in typical drivesDiscusses practical application of cha...

  6. Application of a qPCR Assay with Melting Curve Analysis for Detection and Differentiation of Protozoan Oocysts in Human Fecal Samples from Dominican Republic

    OpenAIRE

    Lalonde, Laura F.; Reyes, Julissa; Gajadhar, Alvin A.

    2013-01-01

    A quantitative polymerase chain reaction assay with melt curve analysis (qPCR-MCA) was applied for the detection of protozoan oocysts in 501 human fecal samples collected in Dominican Republic. Samples were subjected to qPCR using universal coccidia primers targeting 18S rDNA to detect oocysts followed by MCA to identify oocyst species based on amplicon melting temperature. Putative positive samples were also tested by conventional PCR and microscopy. Cystoisospora belli (×3), Cryptosporidium...

  7. Rapid and accurate control rod calibration measurement and analysis

    International Nuclear Information System (INIS)

    In order to reduce the time needed to perform control rod calibrations and improve the accuracy of the results, a technique for a measurement, analysis, and tabulation of integral rod worths has been developed. A single series of critical rod positions are determined at constant low power to reduce the waiting time between positive period measurements and still assure true stable reactor period data. Reactivity values from positive period measurements and control rod drop measurements are used as input data for a non-linear fit to the expected control rod integral worth shape. With this method, two control rods can be calibrated in about two hours, and integral and differential calibration tables for operator use are printed almost immediately. Listings of the BASIC computer programs for the non-linear fitting and calibration table preparation are provided. (author)

  8. Dynamic analysis of the active control system for the CGST

    Science.gov (United States)

    Dai, Yichun; Yang, Dehua; Zago, Lorenzo; Liu, Zhong

    2012-09-01

    The Chinese Giant Solar Telescope (CGST) is the China’s next generation solar telescope with an aperture of 8 m in diameter. The unique feature of the CGST is its ring primary, which facilitates the polarization detection and thermal control. The CGST is now in its design and development phase. A mosaic mirror with 24 trapezoidal segments is a candidate for its primary mirror, which highly relies on a segment active control system to achieve competitive optical quality of a monolithic mirror. The CGST is designed to operate in open-air observation mode, its active control system thus faces new challenges. As the CGST has an aperture larger than that of current solar telescopes, and as the magnitude of wind load in open air is greater than that of a stellar telescope with a similar aperture yet under the protection of a dome and/or an enclosure. Furthermore, as a mosaic mirror, high precision real-time tip sensing is required to serve the feedback of its control system. The accuracy depends on integration time (or working bandwidth) when an optical metrology is adopted, which should match the bandwidth of the segment control system. In this paper, a dynamic analysis of the segment control system of the CGST is presented. We demonstrate how the dynamic interaction between the segment control system and the telescope structure impacts the telescope’s optical performance under wind disturbances. The dynamic analysis helps to understand the bandwidth limit for the segment control system, and further to clarify technical requirements for tip sensing implementation, telescope structure design and wind shielding design.

  9. Preliminary control system design and analysis for the Space Station Furnace Facility thermal control system

    Science.gov (United States)

    Jackson, M. E.

    1995-01-01

    This report presents the Space Station Furnace Facility (SSFF) thermal control system (TCS) preliminary control system design and analysis. The SSFF provides the necessary core systems to operate various materials processing furnaces. The TCS is defined as one of the core systems, and its function is to collect excess heat from furnaces and to provide precise cold temperature control of components and of certain furnace zones. Physical interconnection of parallel thermal control subsystems through a common pump implies the description of the TCS by coupled nonlinear differential equations in pressure and flow. This report formulates the system equations and develops the controllers that cause the interconnected subsystems to satisfy flow rate tracking requirements. Extensive digital simulation results are presented to show the flow rate tracking performance.

  10. Design analysis and microprocessor based control of a nuclear reactor

    International Nuclear Information System (INIS)

    The object of this thesis is to design and test a microprocessor based controller, to a simulated nuclear reactor system. The mathematical model that describes the dynamics of a typical nuclear reactor of one group of delayed neutrons approximations with temperature feedback was chosen. A digital computer program has been developed for the design and analysis of a simulated model based on the concept of state-variable feedback in order to meet a desired system response with maximum overshoot of 3.4% and setting time of 4 sec. The state variable feedback coefficients are designed for the continuous system, then an approximation is used to obtain in the state variable feedback vector for the discrete system. System control was implemented utilizing Direct Digital Control (DDC) of a nuclear reactor simulated model through a control algorithm that was performed by means of a microprocessor based system. The controller performance was satisfactorily tested by exciting the reactor system with a transient reactivity disturbance and by a step change in power demand. Direct digital control, when implemented on a microprocessor adds versatility, flexibility in system design with the added advantage of possible use of optimal control algorithms. 6 tabs.; 30 figs.; 46 refs.; 6 apps

  11. Risk-based configuration control system: Analysis and approaches

    International Nuclear Information System (INIS)

    This paper presents an analysis of risks associated with component outage configurations during power operation of a nuclear power plant and discusses approaches and strategies for developing a risk-based configuration control system. A configuration, as used here, is a set of component states. The objective of risk-based configuration control is to detect and control plant configurations using a risk-perspective. The configuration contributions to core-melt frequency and core-melt probability are studied for two plants. Large core-melt frequency can be caused by configurations and there are a number of such configurations that are not currently controlled by technical specifications. However, the expected frequency of occurrence of the impacting configurations is small and the actual core-melt probability contributions are also generally small. Effective strategies and criteria for controlling configuration risks are presented. Such control strategies take into consideration the risks associated with configurations, the nature and characteristics of the configuration risks, and also the practical considerations such as adequate repair times and/or options to transfer to low risk configurations. Alternative types of criteria are discussed that are not overly restrictive to result in unnecessary plant shutdown, but rather motivates effective test and maintenance practices that control risk-significant configurations to allow continued operation with an adequate margin to meet challenges to safety

  12. Analysis of locally controlled esophageal carcinomas treated with radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Gotoh, Yasuo; Yamada, Shogo; Takai, Yoshihiro; Nemoto, Kenji; Ogawa, Yoshihiro; Hoshi, Akihiko; Ariga, Hisanori; Sakamoto, Kiyohiko [Tohoku Univ., Sendai (Japan). School of Medicine

    1996-05-01

    Of 227 esophageal carcinomas treated with a radiation dose of 60 Gy or more, 100 patients had no tumor or ulceration (with or without stenosis) of the esophagus after irradiation. We analyzed local control factors of these 100 patients to determine the need for further treatment. The cumulative local control rate at five years was 40% in all cases, 37% in 21 cases without any stenosis of the esophagus and 40% in 79 cases with stenosis. The presence of stenosis of the esophagus after irradiation was not a critical factor in predicting final local control. Local recurrence of tumors with findings of Borrmann III or Borrmann IV by the pretreatment esophageal barium study, tumors controlled after a total dose of more than 80 Gy, tumors without low dose rate telecobalt therapy (LDRT: 1 Gy/hour, 5 to 7 Gy/day, a total dose of 12 to 15 Gy) as boost therapy, and apparently controlled tumors with a stenotic ratio of 60% or more or with 5 cm or more length of stenosis of the esophagus after irradiation was significantly higher than that of the others (p<0.05). Multivariate analysis revealed that findings of pretreatment barium study, total dose, with or without LDRT, and length of stenosis of the esophagus after irradiation were significantly important factors in local control. Members of the high risk group of apparently controlled tumors should undertake surgical treatment or further intensive chemotherapy. (author)

  13. Analysis of locally controlled esophageal carcinomas treated with radiotherapy

    International Nuclear Information System (INIS)

    Of 227 esophageal carcinomas treated with a radiation dose of 60 Gy or more, 100 patients had no tumor or ulceration (with or without stenosis) of the esophagus after irradiation. We analyzed local control factors of these 100 patients to determine the need for further treatment. The cumulative local control rate at five years was 40% in all cases, 37% in 21 cases without any stenosis of the esophagus and 40% in 79 cases with stenosis. The presence of stenosis of the esophagus after irradiation was not a critical factor in predicting final local control. Local recurrence of tumors with findings of Borrmann III or Borrmann IV by the pretreatment esophageal barium study, tumors controlled after a total dose of more than 80 Gy, tumors without low dose rate telecobalt therapy (LDRT: 1 Gy/hour, 5 to 7 Gy/day, a total dose of 12 to 15 Gy) as boost therapy, and apparently controlled tumors with a stenotic ratio of 60% or more or with 5 cm or more length of stenosis of the esophagus after irradiation was significantly higher than that of the others (p<0.05). Multivariate analysis revealed that findings of pretreatment barium study, total dose, with or without LDRT, and length of stenosis of the esophagus after irradiation were significantly important factors in local control. Members of the high risk group of apparently controlled tumors should undertake surgical treatment or further intensive chemotherapy. (author)

  14. Analysis on controlling complex networks based on dominating sets

    Science.gov (United States)

    Nacher, Jose C.; Akutsu, Tatsuya

    2013-02-01

    Recent works have emphasized the importance of controlling complex networks and have provided novel analytical approaches based on the maximum matching among others. The analysis leads to the conclusion that the driver nodes tend to avoid the high-degree nodes. Therefore, it implies that apparently inhomogeneous networks are more difficult to control. Here we present an approach to control complex networks from the perspective of the minimum dominating set (MDS). We apply the definition of MDS to complex networks with scale-free structure P(k) propto k-? and assume that a node controls itself and each of its adjacent nodes through its links. Our theoretical calculations and simulations demonstrate that the more heterogeneous a network's degree distribution is, the smaller the fraction of individuals, devices or molecules required to control the entire system is. Here, we have extended our recent analytical derivations and we now provide a more accurate analysis for the case ? performed additional computer simulations to study in more detail the dependence of the MDS with the network size and the average degree below the phase transition at ? = 2.

  15. Nonsmooth optimization analysis and algorithms with applications to optimal control

    CERN Document Server

    Makela, M M

    1992-01-01

    This book is a self-contained elementary study for nonsmooth analysis and optimization, and their use in solution of nonsmooth optimal control problems. The first part of the book is concerned with nonsmooth differential calculus containing necessary tools for nonsmooth optimization. The second part is devoted to the methods of nonsmooth optimization and their development. A proximal bundle method for nonsmooth nonconvex optimization subject to nonsmooth constraints is constructed. In the last part nonsmooth optimization is applied to problems arising from optimal control of systems covered by

  16. Analysis and Design of Launch Vehicle Flight Control Systems

    Science.gov (United States)

    Wie, Bong; Du, Wei; Whorton, Mark

    2008-01-01

    This paper describes the fundamental principles of launch vehicle flight control analysis and design. In particular, the classical concept of "drift-minimum" and "load-minimum" control principles is re-examined and its performance and stability robustness with respect to modeling uncertainties and a gimbal angle constraint is discussed. It is shown that an additional feedback of angle-of-attack or lateral acceleration can significantly improve the overall performance and robustness, especially in the presence of unexpected large wind disturbance. Non-minimum-phase structural filtering of "unstably interacting" bending modes of large flexible launch vehicles is also shown to be effective and robust.

  17. Impact of JIT on Quality Control Cost: A Sensitivity Analysis

    OpenAIRE

    Vikas Kumar,

    2014-01-01

    Many authors have been developed the models to study the influence of JIT on inventory. On other hand, strategic impact of JIT on quality control cost has not been clear-cut. The purpose of this paper is to study the impact of JIT on quality control by developing a model. The developed model is illustrated though a sensitivity analysis and a numeric example so that more attention could be provided on the most critical input parameters of model. The framework developed in this ...

  18. Multi-dimensional project evaluation: Combining cost-benefit analysis and multi-criteria analysis with the COSIMA software system

    DEFF Research Database (Denmark)

    This paper proposes a methodology that integrates quantitative and qualitative assessment. The methodology proposed combines conventional cost-benefit analysis (CBA) with multi-criteria analysis (MCA). The CBA methodology, based on welfare theory, assures that the project with the highest welfare for society is ranked uppermost. To compare the different impacts, it is necessary to have a common monetary unit. Theoretically, all benefits and all costs should be accounted for in socio-economic cost-benefit analysis. However, this is far from in practical the general case due to difficulties in a valuating all the criteria in monetary terms. Thus CBA does not meet the need for a comprehensive evaluation, for which reason MCA is introduced to overcome this problem. Not only does MCA provides an opportunity to include non-market impacts in the analysis, but MCA also provides a framework for breaking down a problem into its constituent parts in order to better understand the problem and consequently arrive at a decision. However, while MCA opens up for the possibility to include non-market impacts, it does not provide the decision makers with guidance combining the CBA with MCA. In the paper different methods for combining cost-benefit analysis and multi-criteria analysis are examined and compared and a software system is presented. The software system gives the decision makers some possibilities regarding preference analysis, sensitivity and risk analysis. The aim of the software is to facilitate a straightforward method to support decision making involving both quantitative and qualitative impacts. An outcome of this is that the methodology and the results on this basis are easily understood by the different stakeholders, which is seen as important. The methodology and software system are demonstrated by examining the decision problem of choosing between alternatives for a new airport to service the capital of Greenland, Nuuk. Three different alternatives are examined ranging in costs from 90m USD to 400m USD. Furthermore, three sets of different stakeholders’ preferences (decision makers, citizens in Nuuk and other citizens in Greenland) are examined and compared. The cost-benefit analysis of the three airport alternatives includes impacts like travel time (for business and local travellers), waiting time, drawback of shifts, regularity, out of pocket costs, operating costs and not the least construction and maintenance costs. The MCA is made use of to assess noise, land use planning, business potential and tourism impacts for the three alternatives. More technically the software system offers a set of different features to undertake the MCA. Thus the users have two different methods to assess weights for the criteria, either by using the Swing Weight method or the more simple Rank Order Distribution (ROD) method. For evaluating the different alternatives with respect to each criterion the user has the possibility of making use of the Analytical Hierarchy Process (AHP), REMBRANDT or Simple Multiple-Attribute Rating Technique Exploiting Ranks (SMARTER) methods. Finally, a feature combining the CBA and MCA results can be provided by applying a trade off between the two methods or by means of the so called efficiency frontier is demonstrated. The presented multi-dimensional methodology and software system for CBA and MCA decision making is finally compared with other methods for combining the CBA and MCA. Ultimately, some conclusions are made and perspectives are drawn. Keywords: Cost-benefit analysis, Multi-criteria analysis, Multiple Criteria Decision Aiding, Transport infrastructure, Analytical Hierarchy Process, REMBRANDT, SMARTER, stakeholders’ preferences and CBA&MCA Software system.

  19. Control System Dynamics Analysis Of TRIGA Mark II Bandung

    International Nuclear Information System (INIS)

    The root locus analysis of TRIGA MARK II reactor was performed. The parameters were calculated based from the experimental data. The experiment was performed between 100 kW to 1 MW of power, average fuel temperature was 189oC and water average temperature was 37.3oC to measure temperature and xenon poisoning feedback. On the design analysis of PID system the characteristic of the controller are gain K=2.72, tp=13.65 seconds, Mp=0.0075%, Ti=4.1 seconds and Td=0.24 seconds. The controller transient time is less than 30 seconds and the settling time is less than 2% as well

  20. Development, analysis, and control of the inductor-converter bridge

    International Nuclear Information System (INIS)

    The inductor-converter bridge (ICB) is a solid state dc-ac-dc power converter system for bidirectional, controllable, energy transfer between two high Q magnet coils. The ICB is suitable for supplying large pulsed power to such magnets as the superconducting equilibrium field (EF) coil of the proposed tokamak power reactors, from another superconducting energy storage coil. This report presents work on the analysis and control of the ICB system. The process of energy transfer between the coils is explained on the basis of a simple one line equivalent circuit. This circuit is the topological dual of the one line diagram of the nonsalient pole synchoronous generator, connected to the infinite bus through its synchronous reactance. The changes in the average power, average coil currents, and voltages, as functions of time, are calculated by the conventional Fourier method of analysis

  1. Control and analysis software for a laser scanning microdensitometer

    Indian Academy of Sciences (India)

    H R Bundel; C P Navathe; P A Naik; P D Gupta

    2006-02-01

    A PC-based control software and data acquisition system is developed for an existing commercial microdensitometer (Biomed make model No. SL-2D/1D UV/VIS) to facilitate scanning and analysis of X-ray ?lms. The software is developed in Labview, which includes operation of the microdensitometer in 1D and 2D scans and analysis of spatial or spectral data on X-ray ?lms, such as optical density, intensity and wavelength. It provides a user-friendly Graphical User Interface (GUI) to analyse the scanned data and also store the analysed data/image in popular formats like data in Excel and images in jpeg. It has also on-line calibration facility with standard optical density tablets. The control software and data acquisition system is simple, inexpensive and versatile.

  2. Analysis and test verification of control rod buffer in HTR

    International Nuclear Information System (INIS)

    The thin-walled shell buffer in high temperature gas-cooled reactor (HTR) was designed for absorbing the kinetic energy of the control rod drop in the drive line fracture accident. The thin-walled cylinder structure satisfying the requirements of actual working condition was design by using the energy absorption model of the classical cylinder shell under axial pressure. By using ABAQUS/explicit with J-C constitutive model, the finite element models of both the real reactor condition and the test condition were built to simulate the collision. Based on the analysis results, the control rod fall- down test was designed and implemented. The test results demonstrate that stable pro gressive buckling occurs when the full size buffer is impacted by equiponderance test bar, and the buffer can reduce the crush force effectively and protect the graphite from being destroyed. The analysis results show that the test model can represent and envelope the real condition in reactor. (authors)

  3. Analysis of limit cycling on a boiler feedwater control system

    International Nuclear Information System (INIS)

    During operation of the UKAEA Prototype Fast Reactor, it was found that oscillations sometimes occurred in the boiler feedwater systems. These were normally of relatively low amplitude, but led to the adoption of low controller gains so that control was rather slack. While control performance proved generally adequate for steady running, the lack of tight control of steam drum levels sometimes led to difficulties during periods when plant conditions were undergoing major change. The paper discusses the methods used to gain a full understanding of the phenomena occurring, and describes how that knowledge is being used to improve the control system so as to eliminate the limit cycling modes and ensure good control of steam drum levels. A noteworthy feature of the study was the use of two independent representations of plant behaviour: (i) a frequency response model, FWRFREQ, and (ii) a time-domain simulation model, PFRTDM. The simplified analysis of FWRFREQ proved to be of enormous value in identifying modes of system behaviour; PFRTDM was used as a detailed check on the accuracy and validity of the results obtained. (author)

  4. Pressure Control in Distillation Columns: A Model-Based Analysis

    DEFF Research Database (Denmark)

    Mauricio Iglesias, Miguel; Bisgaard, Thomas

    2014-01-01

    A comprehensive assessment of pressure control in distillation columns is presented, including the consequences for composition control and energy consumption. Two types of representative control structures are modeled, analyzed, and benchmarked. A detailed simulation test, based on a real industrial distillation column, is used to assess the differences between the two control structures and to demonstrate the benefits of pressure control in the operation. In the second part of the article, a thermodynamic analysis is carried out to establish the influence of pressure on relative volatility for (pseudo)binary mixtures. A simple criterion is found, based on the difference in the scaled heats of vaporization of the light and heavy compounds: A large difference indicates that relative volatility is sensitive to pressure changes, whereas no a priori conclusion can be made for small differences. Depending on the sensitivity of relative volatility to pressure, it is shown that controlling the bottom-tray pressure instead of the top-tray pressure leads to operation at the minimum possible average column pressure, so that significant energy savings can be achieved.

  5. Multilayer FeRh/MgO: controllable magnetocrystalline anisotropy for an antiferromagnetic system

    Science.gov (United States)

    Zheng, Guohui; Dorj, Odkhuu; Ke, Sanhuang; Ramesh, Rammoorthy; Miao, Maosheng; Kioussis, Nickolas

    2015-03-01

    Controlling the magnetocrystalline anisotropy (MCA) of ferromagnetic (FM) thin films by tunable strain and electric field has been pursued as an effective method of achieving low-power and highly scalable memory. Comparing with FM materials, AFM are much less sensitive to external magnetic field, a substantial advantage for memory devices. Inspired by recent work on AFM memory resistors based on FeRh, we carried out a systematic first principles study of the MCA of multi-layer FeRh, either stand alone, or combined with MgO layers. FeRh is a unique material that undergoes a transition from AFM (type-II) to FM at elevated temperature of 370 K. Our calculations for thin films of FeRh from 5-15 atomic layers reveal that AFM is always the most stable configuration for Fe terminated films; while for Rh terminated films, there is a transition from FM to a configuration featured AFM at the center layers and FM at the surface layers (reconstructed). While applying the spin-orbit interactions (SOI) for the valence electrons, we found Fe-terminated films exhibit a relatively small MCA that varies and may change sign with film thickness, substrate and strain, providing a possibility of spin reorientation via the control of strain and electric field. The k-resolved MCA values reveals that the region around Gamma point adds the major contribution to the MCA.

  6. Electrical Power Distribution and Control Modeling and Analysis

    Science.gov (United States)

    Fu, Johnny S.; Liffring, Mark; Mehdi, Ishaque S.

    2001-01-01

    This slide presentation reviews the use of Electrical Power Distribution and Control (EPD&C) Modeling and how modeling can support analysis. The presentation discusses using the EASY5 model to simulate and analyze the Space Shuttle Electric Auxiliary Power Unit. Diagrams of the model schematics are included, as well as graphs of the battery cell impedance, hydraulic load dynamics, and EPD&C response to hydraulic load variations.

  7. Interference control in low-level analysis of iodine 129

    International Nuclear Information System (INIS)

    This work analyses the integration of several steps applied to control potentials sources of error in the determination of 129I and prevent spurious results in order to achieve the minimum detection limit. The procedure of pre and post-irradiation purification, neutron irradiation, radioactive counting and data analysis are needed. High resolution gamma spectrometry was used for detection and measurement of low level interferences. (author)

  8. Evolutionary and functional analysis of transcription factors controlling leaf development

    OpenAIRE

    Guedes Corrêa, Luiz Gustavo

    2009-01-01

    Leaves are the main photosynthetic organs of vascular plants, and leaf development is dependent on a proper control of gene expression. Transcription factors (TFs) are global regulators of gene expression that play essential roles in almost all biological processes among eukaryotes. This PhD project focused on the characterization of the sink-to-source transition of Arabidopsis leaves and on the analysis of TFs that play a role in early leaf development. The sink-to-source transition occu...

  9. Immunosensor with Fluid Control Mechanism for Salivary Cortisol Analysis

    OpenAIRE

    Yamaguchi, Masaki; Matsuda, Yohei; Sasaki, Shohei; Sasaki, Makoto; Kadoma, Yoshihiro; Imai, Yoshikatsu; Niwa, Daisuke; Shetty, Vivek

    2012-01-01

    The purpose of this research is to demonstrate a new design for a cortisol immunosensor for the noninvasive and quantitative analysis of salivary cortisol. We propose a cortisol immunosensor with a fluid control mechanism which has both a vertical flow and a lateral flow. The detected current resulting from a competitive reaction between the sample cortisol and a glucose oxidase (GOD)-labeled cortisol conjugate was found to be inversely related to the concentration of cortisol in the sample s...

  10. Analysis of factors influencing local control of medulloblastoma

    International Nuclear Information System (INIS)

    To examine the influence of various prognostic factors on local control of medulloblastoma. Sixty-five patients who had been treated between 1980 and 1990 at our six hospitals were retrospectively studied. Factors included in the Cox's multivariate analysis were sex, age (log(y.o.+1)), performance status, pretreatment T-stage (judged from the findings of CT and/or MRI; T1: 3 patients, T2: 17, T3 (with hydrocephalus): 44, T4: 1), extent of surgical resection (total: 30 patients, less than total: 35), total dose (21-87 Gy, median: 55) and overall treatment time (19-163 days, median: 54) of local irradiation, and use of adjuvant chemotherapy or immunotherapy. Recurrence occurred in one T2 patient and in 17 T3 patients. The multivariate analysis showed that local tumor control decreased with advance in T-stage (p=0.04) and with prolonged overall treatment times (p=0.003), and that it increased with higher total doses (p=0.01). When analysis was limited to T3 patients, usefulness of the chemotherapy was also suggested (p=0.03). However, the influence of the extent of resection on local tumor control was not statistically significant because resectability depended on T-stage. This analysis showed that local control of medulloblastoma was influenced by pretreatment T-stage, total dose and overall irradiation treatment time, and probably by the adjuvant chemotherapy used. Some of the observed losses by prolongations in radiotherapy may reflect proliferation of tumor cells during radiotherapy. (author)

  11. System integration and control strategy analysis of PEMFC car

    International Nuclear Information System (INIS)

    A new fuel car was designed according to the prototype LN2000 hydrogen-oxygen fuel cell car. The new prototype consists of a compact fuel cell engine with separated fuel cell stack, nickel metal hydride battery, a motor with power of 30Kw/100Kw and an inverter with high efficiency. With in the powertrain, a two-shift Planet gear transmission was employed. The power performance was greatly improved. New battery with EMS, new self-developed fuel cell engine, the motor propulsion system and electronic controlled transmission make it feasible to control the whole fuel car automatically and efficiently with optimization. The presents the system integration and the control strategy analysis of the fuel cell car prototype. The paper can be used for reference for engineers in the field of fuel cell vehicle. (author)

  12. Decentralized Control of Cooperative Systems: Categorization and Complexity Analysis

    CERN Document Server

    Goldman, C V; 10.1613/jair.1427

    2011-01-01

    Decentralized control of cooperative systems captures the operation of a group of decision makers that share a single global objective. The difficulty in solving optimally such problems arises when the agents lack full observability of the global state of the system when they operate. The general problem has been shown to be NEXP-complete. In this paper, we identify classes of decentralized control problems whose complexity ranges between NEXP and P. In particular, we study problems characterized by independent transitions, independent observations, and goal-oriented objective functions. Two algorithms are shown to solve optimally useful classes of goal-oriented decentralized processes in polynomial time. This paper also studies information sharing among the decision-makers, which can improve their performance. We distinguish between three ways in which agents can exchange information: indirect communication, direct communication and sharing state features that are not controlled by the agents. Our analysis s...

  13. Robust Stability Analysis with Time Delay Using PI Controller

    Directory of Open Access Journals (Sweden)

    Gursewak Singh

    2012-11-01

    Full Text Available In this paper, real time implementation of PI and PID controllers is Investigated for stabilizing an arbitrary-order plant or system. Simple closed loop feedback ,PI controller can overcome all the problems of uncertainties like time delay in LTI (Linear Time Invariant system.This paper will give us an implortant alogorithm to be imlemented in MATLAB for achieving the robust stability in LTI plant in presence of any type of perturbations or external disturbances. In this paper, a single input and single output (LTI linear time invariant plant under perturbed conditions with additive uncertainity weight senstivity is considered. In this paper especially, I have found all set of PI gains Kp,Ki which will promise us for the stability in a given disturbed (SISO (LTI system by achieving the robust stability constraint ? <=1 can be found by obtaining the PI controller gains Kp,Ki using frequency domain analysis .

  14. Detrended fluctuation analysis of a systolic blood pressure control loop

    Science.gov (United States)

    Galhardo, C. E. C.; Penna, T. J. P.; Argollo de Menezes, M.; Soares, P. P. S.

    2009-10-01

    We use detrended fluctuation analysis (DFA) to study the dynamics of blood pressure oscillations and its feedback control in rats by analyzing systolic pressure time series before and after a surgical procedure that interrupts its control loop. We found, for each situation, a crossover between two scaling regions characterized by exponents that reflect the nature of the feedback control and its range of operation. In addition, we found evidence of adaptation in the dynamics of blood pressure regulation a few days after surgical disruption of its main feedback circuit. Based on the paradigm of antagonistic, bipartite (vagal and sympathetic) action of the central nerve system, we propose a simple model for pressure homeostasis as the balance between two nonlinear opposing forces, successfully reproducing the crossover observed in the DFA of actual pressure signals.

  15. Detrended fluctuation analysis of a systolic blood pressure control loop

    International Nuclear Information System (INIS)

    We use detrended fluctuation analysis (DFA) to study the dynamics of blood pressure oscillations and its feedback control in rats by analyzing systolic pressure time series before and after a surgical procedure that interrupts its control loop. We found, for each situation, a crossover between two scaling regions characterized by exponents that reflect the nature of the feedback control and its range of operation. In addition, we found evidence of adaptation in the dynamics of blood pressure regulation a few days after surgical disruption of its main feedback circuit. Based on the paradigm of antagonistic, bipartite (vagal and sympathetic) action of the central nerve system, we propose a simple model for pressure homeostasis as the balance between two nonlinear opposing forces, successfully reproducing the crossover observed in the DFA of actual pressure signals.

  16. Detrended Fluctuation Analysis of Systolic Blood Pressure Control Loop

    CERN Document Server

    Galhardo, C E C; de Menezes, M Argollo; Soares, P P S

    2009-01-01

    We use detrended fluctuation analysis (DFA) to study the dynamics of blood pressure oscillations and its feedback control in rats by analyzing systolic pressure time series before and after a surgical procedure that interrupts its control loop. We found, for each situation, a crossover between two scaling regions characterized by exponents that reflect the nature of the feedback control and its range of operation. In addition, we found evidences of adaptation in the dynamics of blood pressure regulation a few days after surgical disruption of its main feedback circuit. Based on the paradigm of antagonistic, bipartite (vagal and sympathetic) action of the central nerve system, we propose a simple model for pressure homeostasis as the balance between two nonlinear opposing forces, successfully reproducing the crossover observed in the DFA of actual pressure signals.

  17. Microgravity isolation system design: A modern control analysis framework

    Science.gov (United States)

    Hampton, R. D.; Knospe, C. R.; Allaire, P. E.; Grodsinsky, C. M.

    1994-01-01

    Many acceleration-sensitive, microgravity science experiments will require active vibration isolation from the manned orbiters on which they will be mounted. The isolation problem, especially in the case of a tethered payload, is a complex three-dimensional one that is best suited to modern-control design methods. These methods, although more powerful than their classical counterparts, can nonetheless go only so far in meeting the design requirements for practical systems. Once a tentative controller design is available, it must still be evaluated to determine whether or not it is fully acceptable, and to compare it with other possible design candidates. Realistically, such evaluation will be an inherent part of a necessary iterative design process. In this paper, an approach is presented for applying complex mu-analysis methods to a closed-loop vibration isolation system (experiment plus controller). An analysis framework is presented for evaluating nominal stability, nominal performance, robust stability, and robust performance of active microgravity isolation systems, with emphasis on the effective use of mu-analysis methods.

  18. Intelligent Control in Automation Based on Wireless Traffic Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Kurt Derr; Milos Manic

    2007-09-01

    Wireless technology is a central component of many factory automation infrastructures in both the commercial and government sectors, providing connectivity among various components in industrial realms (distributed sensors, machines, mobile process controllers). However wireless technologies provide more threats to computer security than wired environments. The advantageous features of Bluetooth technology resulted in Bluetooth units shipments climbing to five million per week at the end of 2005 [1, 2]. This is why the real-time interpretation and understanding of Bluetooth traffic behavior is critical in both maintaining the integrity of computer systems and increasing the efficient use of this technology in control type applications. Although neuro-fuzzy approaches have been applied to wireless 802.11 behavior analysis in the past, a significantly different Bluetooth protocol framework has not been extensively explored using this technology. This paper presents a new neurofuzzy traffic analysis algorithm of this still new territory of Bluetooth traffic. Further enhancements of this algorithm are presented along with the comparison against the traditional, numerical approach. Through test examples, interesting Bluetooth traffic behavior characteristics were captured, and the comparative elegance of this computationally inexpensive approach was demonstrated. This analysis can be used to provide directions for future development and use of this prevailing technology in various control type applications, as well as making the use of it more secure.

  19. Intelligent Control in Automation Based on Wireless Traffic Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Kurt Derr; Milos Manic

    2007-08-01

    Wireless technology is a central component of many factory automation infrastructures in both the commercial and government sectors, providing connectivity among various components in industrial realms (distributed sensors, machines, mobile process controllers). However wireless technologies provide more threats to computer security than wired environments. The advantageous features of Bluetooth technology resulted in Bluetooth units shipments climbing to five million per week at the end of 2005 [1, 2]. This is why the real-time interpretation and understanding of Bluetooth traffic behavior is critical in both maintaining the integrity of computer systems and increasing the efficient use of this technology in control type applications. Although neuro-fuzzy approaches have been applied to wireless 802.11 behavior analysis in the past, a significantly different Bluetooth protocol framework has not been extensively explored using this technology. This paper presents a new neurofuzzy traffic analysis algorithm of this still new territory of Bluetooth traffic. Further enhancements of this algorithm are presented along with the comparison against the traditional, numerical approach. Through test examples, interesting Bluetooth traffic behavior characteristics were captured, and the comparative elegance of this computationally inexpensive approach was demonstrated. This analysis can be used to provide directions for future development and use of this prevailing technology in various control type applications, as well as making the use of it more secure.

  20. Transcriptome analysis of mature fruit abscission control in olive.

    Science.gov (United States)

    Gil-Amado, Jose A; Gomez-Jimenez, Maria C

    2013-02-01

    Mature fruit abscission (MFA) is a genetically controlled process, through poorly characterized mechanisms in fleshy fruit that include extensive transcriptional changes. While global transcriptome analyses have been used to investigate immature fruit abscission in fleshy fruit, no global gene expression changes specific to MFA have been described. Here we use pyrosequencing to characterize the transcriptomes of the olive abscission zone (AZ) during cell separation in order to understand MFA control at the stage of AZ activation. Analysis of gene expression from these AZs reveals that membrane microdomains involving sterols/sphingolipids and remorins together with signaling proteins are potentially involved in MFA. This is accompanied by gene activity related to sphingolipid turnover, suggesting potentially the involvement of long-chain base metabolism in regulating MFA. Activation of vesicle trafficking involving small GTPases is probably required for cell wall modifications during abscission. Analysis of transcription factors indicates that most members of the MYB and bZIP families are abundantly represented in the fruit AZ, and is consistent with a model by which most of the key transcription factors during abscission may regulate downstream processes mostly related to ABA. The data provide the first thorough analysis available for a comprehensive picture of the array of cellular responses controlled by gene expression that lead to MFA in fleshy fruit. PMID:23292600

  1. Quality Assurance and Control in Laboratory using Neutron Activation Analysis

    International Nuclear Information System (INIS)

    In accordance with the increment of international trade associated with the worldwide globalization, the importance of quality assurance and control for the commodity produced from one's own country has been stressed. ISO (International Organization for Standards) defines quality control as 'the operational techniques and activities that are used to fulfill the requirements for quality'. Since 1996, the HANARO research reactor in the Korea Atomic Energy Research Institute has been operated thereafter initial critical operation on April 1995. Neutron activation analysis system and applied techniques which is one of a nuclear analytical technologies using reactor neutrons has been developed for user's supporting and the establishment of the quality system for a measurement and analysis, testing and inspection was implemented successfully. On the basis of the qualified NAA system, the test and measurement of more than 1500 samples which is requested from 30 organizations including industrial companies, universities and institutes carried out in NAA laboratory annually. Moreover, as the goal of mutual recognition agreement (MRA) which can be removed a technical barrier in international trade, the objectivity and the confidence of analytical quality in NAA laboratory became established through the installation of international accreditation system by implementing analytical quality system in accordance with international standards in 2001. The aim of the report was to summarize the technical management of introduction, methods and the results for a quality control and assurance which should be performed in NAA technique using the HANARO research reactor. The report will help building up effective quality control strategy in the future

  2. Experimental Bifurcation Analysis Using Control-Based Continuation

    DEFF Research Database (Denmark)

    Bureau, Emil

    2014-01-01

    The focus of this thesis is developing and implementing techniques for performing experimental bifurcation analysis on nonlinear mechanical systems. The research centers around the newly developed control-based continuation method, which allows to systematically track branches of stable and unstable equilibria under variation of parameters. As a test case we demonstrate that it is possible to track the complete frequency response, including the unstable branches, for a harmonically forced impact oscillator with hardening spring nonlinearity, controlled by electromagnetic actuators. The method requires the constitution of a non-invasive and locally stabilizing control scheme, which must be tuned without a-priori study of a model. We propose a sequence of experiments that allows to choose optimal control-gains, filter parameters and settings for a continuation method. This experimental tuning procedure is applied to our test rig, resulting in a reliable non-invasive, locally stabilizing control. The use of stabilizing control makes it difficult to determine the stability of the underlying uncontrolled equilibrium. Based on the idea of momentarily modifying or disabling the control and study the resulting behavior, we propose and test three different methods for assessing stability of equilibrium states during experimental continuation. We show that it is possible to determine the stability without allowing unbounded divergence, and that it is under certain circumstances possible to quantify instability in terms of finite-time Lyapunov exponents. A software toolbox for the Matlab continuation platform COCO has been developed and will be made freely available. This toolbox implements functions necessary for interfacing a numerical continuation code with a real experiment, as well as provide means for simulating control-based continuation experiments. Finally, the feasibility of implementing the method for rotating machinery is discussed.

  3. Contribution to stability analysis of nonlinear control systems

    Directory of Open Access Journals (Sweden)

    ?varc Ivan

    2003-12-01

    Full Text Available The Popov criterion for the stability of nonlinear control systems is considered. The Popov criterion gives sufficient conditions for stability of nonlinear systems in the frequency domain. It has a direct graphical interpretation and is convenient for both design and analysis. In the article presented, a table of transfer functions of linear parts of nonlinear systems is constructed. The table includes frequency response functions and offers solutions to the stability of the given systems. The table makes a direct stability analysis of selected nonlinear systems possible. The stability analysis is solved analytically and graphically.Then it is easy to find out if the nonlinear system is or is not stable; the task that usually ranks among the difficult task in engineering practice.

  4. Evaluation of Dairy Effluent Management Options Using Multiple Criteria Analysis

    Science.gov (United States)

    Hajkowicz, Stefan A.; Wheeler, Sarah A.

    2008-04-01

    This article describes how options for managing dairy effluent on the Lower Murray River in South Australia were evaluated using multiple criteria analysis (MCA). Multiple criteria analysis is a framework for combining multiple environmental, social, and economic objectives in policy decisions. At the time of the study, dairy irrigation in the region was based on flood irrigation which involved returning effluent to the river. The returned water contained nutrients, salts, and microbial contaminants leading to environmental, human health, and tourism impacts. In this study MCA was used to evaluate 11 options against 6 criteria for managing dairy effluent problems. Of the 11 options, the MCA model selected partial rehabilitation of dairy paddocks with the conversion of remaining land to other agriculture. Soon after, the South Australian Government adopted this course of action and is now providing incentives for dairy farmers in the region to upgrade irrigation infrastructure and/or enter alternative industries.

  5. Fault-tolerant Supervisory Control : System Analysis and Logic Design

    DEFF Research Database (Denmark)

    Izadi-Zamanabadi, Roozbeh

    1999-01-01

    The main purpose of this work has been to achieve active fault-tolerance in control systems, defined as a methodology where fault detection and isolation techniques are combined with supervisory control to achieve autonomous accommodation of faults before they develop into failures. The aim of this work has been to develop and employ concepts and methods that are suitable for use in different automation processes, with applicability in various industrial fields. The requirements for high productivity and quality has resulted in employing additional instrumentation and use of more sophisticated control algorithms. The drawback is, however, that these control systems have become more vulnerable to even simple faults in instrumentation. On the other hand, due to cost-optimality requirements, an extensive use of hardware redundancy has been prohibited. Nevertheless, the dependency and availability could be increased through enhancing control systems' ability to on-line perform fault detection and reconfiguration when a fault occurs and before a safety system shuts-down the entire process. The main contributions of this research effort are development and experimentation with methodologies for systematic analysis of reconfiguration and design of supervisor logic. In addition, useful experience is obtained through implementation of a fault-tolerant control scheme against a simulated ship and its propulsion system. A development methodology, which was suggested in the Control Engineering Department, is extended to cope with the important reconfiguration problem. In order to enable a designer to acquire knowledge about reconfiguration possibilities, the structural analysis method is added as an extension to the existing methodology. This extension builds upon the earlier method where fault propagation and severity analysis are the essential parts. Structural analysis (SA) enables the designer to distinguish between the parts of the systems with no redundant information and the parts with possible redundant information. This method, hence, provides the designer with information, which is necessary during the selection of remedial actions. Furthermore, it is shown how sensor information fusion is obtained by using the SA method. The construction of the supervisor's decision logic is essential for the active form of fault-tolerant control. In this regard, two approaches has been presented. The first aims at constructing the decision logic in form of a ``language''. This language is obtained as a direct result of the component based approach, presented in this thesis. This approach is based on the definition of a functional component, components placement in a control system hierarchy and the definition of system level hierarchy. The supervisor language includes all valid strings, representing the combination of valid components, that keep the system functional. This approach is simple and can be automated. In the second approach, implementation of supervisor functionality is realized on the basis of an extension to the traditional state-event machines. Due to parallelity (inherent modularity) the supervisor logic is more easily modified, updated, maintained, and tested. A salient feature is that a change in one task only necessitates redesign of essentially one corresponding state-event machine (SEM). A heuristic guideline is provided for designing the logic in form of SEMs. A ship propulsion system benchmark has been designed and used as a case study. This includes experimentation with the above methodologies and implementation of a fault-tolerant control against the simulation. Four generic faults have been considered. It has been shown how the SA method is easily employed to generate analytical redundancy relations, which in turn are then used for FDI purposes. Three different methods are used to generate residuals. These methods are: simple numerical calculation, a non-linear observer, and a Neuro-Fuzzy method. Employment of each method follows the assumption about the available system information. The results show that it is p

  6. Component-based analysis of embedded control applications

    DEFF Research Database (Denmark)

    Angelov, Christo K.; Guan, Wei

    2011-01-01

    The widespread use of embedded systems requires the creation of industrial software technology that will make it possible to engineer systems being correct by construction. That can be achieved through the use of validated (trusted) components, verification of design models, and automatic configuration of applications from validated design models and trusted components. This design philosophy has been instrumental for developing COMDES—a component-based framework for distributed embedded control systems. A COMDES application is conceived as a network of embedded actors that are configured from instances of reusable, executable components—function blocks (FBs). System actors operate in accordance with a timed multitasking model of computation, whereby I/O signals are exchanged with the controlled plant at precisely specified time instants, resulting in the elimination of I/O jitter. The paper presents an analysis technique that can be used to validate COMDES design models in SIMULINK. It is based on a transformation of the COMDES design model into a SIMULINK analysis model, which preserves the functional and timing behaviour of the application. This technique has been employed to develop a feasible (light-weight) analysis method based on runtime observers. The latter are conceived as special-purpose actors running in parallel with the application actors, while checking system properties specified in Linear Temporal Logic. Observers are configured from reusable FBs that can be exported to SIMULINK in the same way as application components, making it possible to analyze system properties via simulation. The discussion is illustrated with an industrial case study—a Medical Ventilator Control System, which has been used to validate the developed design and analysis methods.

  7. Statistical analysis of the blast furnace process output parameter using arima control chart with proposed methodology of control limits setting

    Directory of Open Access Journals (Sweden)

    D. Noskievi?ová

    2009-10-01

    Full Text Available The paper deals with the statistical analysis of the selected parameter of the blast furnace process. It was proved that analyzed measurements have been autocorrelated. ARIMA control chart was selected for their analysis as a very useful statistical process control (SPC method. At first the methodology for control limits setting in ARIMA control charts considering the time series outlier analysis as an integral part of the ARIMA model building was designed. Then this proposal was applied to the statistical analysis of the selected blast furnace process output parameter with the aim to compare two production methods.

  8. Assessment of cerebral blood flow reserve using blood oxygen level-dependent echo planar imaging after acetazolamide administration in patients post-STA-MCA anastomosis surgery

    International Nuclear Information System (INIS)

    Recently, blood oxygen level-dependent (BOLD) echo planar imaging (EPI) has been used to estimate blood flow changes. Theoretically, a relative decrement of deoxyhemoglobin in cerebral blood supply induces a MR signal change after neuronal stimulation. In the present study, we have attempted to evaluate CBF reserve capacity by the BOLD EPI in patients who had undergone STA-MCA anastomosis surgery. Then, we compared with the signal intensity changes obtained by this procedure with the CBF changes by Xe-SPECT after acetazolamide administration. Six patients, post-STA-MCA anastomosis surgery, were studied. Pre-operatively, MR signal intensity and CBF, by Xe-SPECT, were increased in the intact side after acetazolamide administration in all patients, and MR signal intensities were decreased in low flow regions after acetazolamide administration in all four patients in whom so-called steal phenomenon was demonstrated by Xe-SPECT study. Post-operatively, poor response was shown after acetazolamide administration with both Xe-SPECT and BOLD EPI in the two patients who had unsuccessful anastomoses. In the successfully anastomosed patients, improved vascular reactivity was demonstrated on BOLD EPI after acetazolamide administration in 3 of 4 patients in whom an improvement of vascular reactivity was demonstrated on Xe-SPECT. In one patient, MRI studies were considered to have technical artifacts, because the MR signal intensity did not increase, even in the intact side after acetazolamide administration. In conclusion, BOLD EPI after acetazolamide administration is an useful procedure for the pre- and post-operative of vascular reserve in patients with ischemic stroke. (author)

  9. Rescue localized intra-arterial thrombolysis for hyperacute MCA ischemic stroke patients after early non-responsive intravenous tissue plasminogen activator therapy

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Dong Joon; Kim, Dong Ik [Yonsei University College of Medicine, Department of Diagnostic Radiology, Seoul (Korea); Kim, Seo Hyun [Yonsei University Wonju College of Medicine, Department of Neurology, Wonju (Korea); Lee, Kyung Yeol [Yong Dong Severance Hospital, Department of Neurology, Seoul (Korea); Heo, Ji Hoe; Han, Sang Won [Yonsei University College of Medicine, Department of Neurology, Seoul (Korea)

    2005-08-01

    The outcome of patients who show no early response to intravenous (i.v.) tissue plasminogen activator (tPA) therapy is poor. The objective of this study was to evaluate the feasibility of rescue localized intra-arterial thrombolysis (LIT) therapy for acute ischemic stroke patients after an early non-responsive i.v. tPA therapy. Patients with proximal MCA occlusions who were treated by LIT (n=10) after failure of early response [no improvement or improvement of National Institute of Health Stroke Scale (NIHSS) scores of {<=}3] to i.v. tPA therapy (0.9 mg/kg - 10% bolus and 90% i.v. infusion over 60 min) were selected. The recanalization rates, incidence of post-thrombolysis hemorrhage and clinical outcomes [baseline and discharge NIHSS scores, mortality, 3 months Barthel index (BI) and modified Rankin score (mRS)] were evaluated. Rescue LIT therapy was performed on ten MCA occlusion patients (male:female=3:7, mean age 71 years). The mean time between the initiation of i.v. tPA therapy and the initiation of intra-arterial urokinase (i.a. UK) was 117{+-}25.0 min [time to i.v. tPA 137{+-}32 min; time to digital subtraction angiography (DSA) 221{+-}42 min; time to i.a. UK 260{+-}46 min]. The baseline NIHSS scores showed significant improvement at discharge (median from 18 to 6). Symptomatic hemorrhage and, consequent, mortality were noted in 2/10 (20%) patients. Three months good outcome was noted in 4/10 (40%, mRS 0-2) and 3/10 (30%, BI {>=}95). In conclusion, rescue LIT therapy can be considered as a treatment option for patients not showing early response to full dose i.v. tPA therapy. Larger scale studies for further validation of this protocol may be necessary. (orig.)

  10. Rescue localized intra-arterial thrombolysis for hyperacute MCA ischemic stroke patients after early non-responsive intravenous tissue plasminogen activator therapy

    International Nuclear Information System (INIS)

    The outcome of patients who show no early response to intravenous (i.v.) tissue plasminogen activator (tPA) therapy is poor. The objective of this study was to evaluate the feasibility of rescue localized intra-arterial thrombolysis (LIT) therapy for acute ischemic stroke patients after an early non-responsive i.v. tPA therapy. Patients with proximal MCA occlusions who were treated by LIT (n=10) after failure of early response [no improvement or improvement of National Institute of Health Stroke Scale (NIHSS) scores of ?3] to i.v. tPA therapy (0.9 mg/kg - 10% bolus and 90% i.v. infusion over 60 min) were selected. The recanalization rates, incidence of post-thrombolysis hemorrhage and clinical outcomes [baseline and discharge NIHSS scores, mortality, 3 months Barthel index (BI) and modified Rankin score (mRS)] were evaluated. Rescue LIT therapy was performed on ten MCA occlusion patients (male:female=3:7, mean age 71 years). The mean time between the initiation of i.v. tPA therapy and the initiation of intra-arterial urokinase (i.a. UK) was 117±25.0 min [time to i.v. tPA 137±32 min; time to digital subtraction angiography (DSA) 221±42 min; time to i.a. UK 260±46 min]. The baseline NIHSS scores showed significant improvement at discharge (median from 18 to 6). Symptomatic hemorrhage and, consequent, mortality were noted in 2/10 (20%) patients. Three months good outcome was noted in 4/10 (40%, mRS 0-2) and 3/10 (30%, BI ?95). In conclusion, rescue LIT therapy can be considered as a treatment option for patients not showing early response to full dose i.v. tPA therapy. Larger scale studies for further validation of this protocol may be necessary. (orig.)

  11. Assessment of quality control approaches for metagenomic data analysis

    Science.gov (United States)

    Zhou, Qian; Su, Xiaoquan; Ning, Kang

    2014-11-01

    Currently there is an explosive increase of the next-generation sequencing (NGS) projects and related datasets, which have to be processed by Quality Control (QC) procedures before they could be utilized for omics analysis. QC procedure usually includes identification and filtration of sequencing artifacts such as low-quality reads and contaminating reads, which would significantly affect and sometimes mislead downstream analysis. Quality control of NGS data for microbial communities is especially challenging. In this work, we have evaluated and compared the performance and effects of various QC pipelines on different types of metagenomic NGS data and from different angles, based on which general principles of using QC pipelines were proposed. Results based on both simulated and real metagenomic datasets have shown that: firstly, QC-Chain is superior in its ability for contamination identification for metagenomic NGS datasets with different complexities with high sensitivity and specificity. Secondly, the high performance computing engine enabled QC-Chain to achieve a significant reduction in processing time compared to other pipelines based on serial computing. Thirdly, QC-Chain could outperform other tools in benefiting downstream metagenomic data analysis.

  12. Spectroscopic analysis technique for arc-welding process control

    Science.gov (United States)

    Mirapeix, Jesús; Cobo, Adolfo; Conde, Olga; Quintela, María Ángeles; López-Higuera, José-Miguel

    2005-09-01

    The spectroscopic analysis of the light emitted by thermal plasmas has found many applications, from chemical analysis to monitoring and control of industrial processes. Particularly, it has been demonstrated that the analysis of the thermal plasma generated during arc or laser welding can supply information about the process and, thus, about the quality of the weld. In some critical applications (e.g. the aerospace sector), an early, real-time detection of defects in the weld seam (oxidation, porosity, lack of penetration, ...) is highly desirable as it can reduce expensive non-destructive testing (NDT). Among others techniques, full spectroscopic analysis of the plasma emission is known to offer rich information about the process itself, but it is also very demanding in terms of real-time implementations. In this paper, we proposed a technique for the analysis of the plasma emission spectrum that is able to detect, in real-time, changes in the process parameters that could lead to the formation of defects in the weld seam. It is based on the estimation of the electronic temperature of the plasma through the analysis of the emission peaks from multiple atomic species. Unlike traditional techniques, which usually involve peak fitting to Voigt functions using the Levenberg-Marquardt recursive method, we employ the LPO (Linear Phase Operator) sub-pixel algorithm to accurately estimate the central wavelength of the peaks (allowing an automatic identification of each atomic species) and cubic-spline interpolation of the noisy data to obtain the intensity and width of the peaks. Experimental tests on TIG-welding using fiber-optic capture of light and a low-cost CCD-based spectrometer, show that some typical defects can be easily detected and identified with this technique, whose typical processing time for multiple peak analysis is less than 20msec. running in a conventional PC.

  13. Mission Analysis and Orbit Control of Interferometric Wheel Formation Flying

    Science.gov (United States)

    Fourcade, J.

    Flying satellite in formation requires maintaining the specific relative geometry of the spacecraft with high precision. This requirement raises new problem of orbit control. This paper presents the results of the mission analysis of a low Earth observation system, the interferometric wheel, patented by CNES. This wheel is made up of three receiving spacecraft, which follow an emitting Earth observation radar satellite. The first part of this paper presents trades off which were performed to choose orbital elements of the formation flying which fulfils all constraints. The second part presents orbit positioning strategies including reconfiguration of the wheel to change its size. The last part describes the station keeping of the formation. Two kinds of constraints are imposed by the interferometric system : a constraint on the distance between the wheel and the radar satellite, and constraints on the distance between the wheel satellites. The first constraint is fulfilled with a classical chemical station keeping strategy. The second one is fulfilled using pure passive actuators. Due to the high stability of the relative eccentricity of the formation, only the relative semi major axis had to be controlled. Differential drag due to differential attitude motion was used to control relative altitude. An autonomous orbit controller was developed and tested. The final accuracy is a relative station keeping better than few meters for a wheel size of one kilometer.

  14. An Analysis of the PLLs With Secondary Control Path

    DEFF Research Database (Denmark)

    Golestan, Saeed; Ramezani, Malek

    2014-01-01

    The phase-locked loops (PLLs) are widely used in different areas of applications particularly for synchronization and control purposes in grid connected applications. A major challenge associated with the PLLs is how to improve their dynamic performance without jeopardizing their stability and filtering capability. Recently, some approaches based on adding a secondary control path (SCP) to the PLL structure have been proposed to deal with this challenge. The objective of this letter is to briefly analyze these approaches. The study starts with an overview of the PLLs with SCP. The letter proceeds with the small-signal modeling of some of these PLLs, which significantly simplifies the analysis. Using these models, the effects of adding the SCP on the PLL structure are studied. The obtained results show that the SCP may not be a practical approach to improve the PLL dynamic performance as it aggravates the stability problem.

  15. Nanosilicon properties, synthesis, applications, methods of analysis and control

    CERN Document Server

    Ischenko, Anatoly A; Aslalnov, Leonid A

    2015-01-01

    Nanosilicon: Properties, Synthesis, Applications, Methods of Analysis and Control examines the latest developments on the physics and chemistry of nanosilicon. The book focuses on methods for producing nanosilicon, its electronic and optical properties, research methods to characterize its spectral and structural properties, and its possible applications. The first part of the book covers the basic properties of semiconductors, including causes of the size dependence of the properties, structural and electronic properties, and physical characteristics of the various forms of silicon. It presents theoretical and experimental research results as well as examples of porous silicon and quantum dots. The second part discusses the synthesis of nanosilicon, modification of the surface of nanoparticles, and properties of the resulting particles. The authors give special attention to the photoluminescence of silicon nanoparticles. The third part describes methods used for studying and controlling the structure and pro...

  16. Cost and schedule control systems for safety analysis report projects

    International Nuclear Information System (INIS)

    As a part of its waste management program at Savannah River site, Westinghouse Savannah River Company (WSRC) is performing safety analyses and providing safety documentation in support of construction in support of construction and operation of nuclear process facilities. The safety documentation includes a major document, the safety analyses report (SAR), which requires a detailed safety analysis of the facility. It is with the control of cost and schedule of SAR projects that this paper is concerned. The cost and schedule control system (CSCS) models developed for SAR projects comply with the principles and requirements of the US Department of Energy's project management system and criteria. The models apply to the SAR structure and allow calculation of key project performance parameters for the SAR as a whole and for individual chapters and sections. The models are based on the concept of earned value, which represents the periodic, consistent measurement of work performed in terms of the budget assigned to that work

  17. Application of Control Volume Analysis to Cerebrospinal Fluid Dynamics

    Science.gov (United States)

    Wei, Timothy; Cohen, Benjamin; Anor, Tomer; Madsen, Joseph

    2011-11-01

    Hydrocephalus is among the most common birth defects and may not be prevented nor cured. Afflicted individuals face serious issues, which at present are too complicated and not well enough understood to treat via systematic therapies. This talk outlines the framework and application of a control volume methodology to clinical Phase Contrast MRI data. Specifically, integral control volume analysis utilizes a fundamental, fluid dynamics methodology to quantify intracranial dynamics within a precise, direct, and physically meaningful framework. A chronically shunted, hydrocephalic patient in need of a revision procedure was used as an in vivo case study. Magnetic resonance velocity measurements within the patient's aqueduct were obtained in four biomedical state and were analyzed using the methods presented in this dissertation. Pressure force estimates were obtained, showing distinct differences in amplitude, phase, and waveform shape for different intracranial states within the same individual. Thoughts on the physiological and diagnostic research and development implications/opportunities will be presented.

  18. Acknowledgement based random access transmission control - An equilibrium analysis

    Science.gov (United States)

    Hajek, B.

    A study is conducted of a general class of retransmission policies called Acknowledgement Based Retransmission Control (ABRC) policies. Under an ABC policy stations wait random lengths of time between packet transmissions, as under the original ALOHA policy. A description is given of a multiaccess broadcast channel model. An important aspect of such a model is the feedback information available to the users. Two different models for the generation of new packets are considered. The first model is the infinite-user model for which the number of new packets transmitted in each slot is given by a sequence of independent Poisson random variables. The second model for packet generation considered is the finite-user population model with M users. The acknowledgement based retransmission control policy is discussed, and an equilibrium analysis of the ABRC policy is conducted.

  19. Muscle networks: Connectivity analysis of EMG activity during postural control

    Science.gov (United States)

    Boonstra, Tjeerd W.; Danna-Dos-Santos, Alessander; Xie, Hong-Bo; Roerdink, Melvyn; Stins, John F.; Breakspear, Michael

    2015-01-01

    Understanding the mechanisms that reduce the many degrees of freedom in the musculoskeletal system remains an outstanding challenge. Muscle synergies reduce the dimensionality and hence simplify the control problem. How this is achieved is not yet known. Here we use network theory to assess the coordination between multiple muscles and to elucidate the neural implementation of muscle synergies. We performed connectivity analysis of surface EMG from ten leg muscles to extract the muscle networks while human participants were standing upright in four different conditions. We observed widespread connectivity between muscles at multiple distinct frequency bands. The network topology differed significantly between frequencies and between conditions. These findings demonstrate how muscle networks can be used to investigate the neural circuitry of motor coordination. The presence of disparate muscle networks across frequencies suggests that the neuromuscular system is organized into a multiplex network allowing for parallel and hierarchical control structures. PMID:26634293

  20. Multi-intersection Traffic Light Control Using Infinitesimal Perturbation Analysis

    CERN Document Server

    Geng, Yanfeng

    2012-01-01

    We address the traffic light control problem for multiple intersections in tandem by viewing it as a stochastic hybrid system and developing a Stochastic Flow Model (SFM) for it. Using Infinitesimal Perturbation Analysis (IPA), we derive on-line gradient estimates of a cost metric with respect to the controllable green and red cycle lengths. The IPA estimators obtained require counting traffic light switchings and estimating car flow rates only when specific events occur. The estimators are used to iteratively adjust light cycle lengths to improve performance and, in conjunction with a standard gradient-based algorithm, to obtain optimal values which adapt to changing traffic conditions. Simulation results are included to illustrate the approach.

  1. Application of on-line laboratory computer analysis to fast neutron activation oxygen determinations

    International Nuclear Information System (INIS)

    The development of an on-line laboratory computer analysis system designed for routine high volume oxygen determinations is discussed. The system is based on the detection of 16N photopeaks from the 16O(n,p) 16N reaction occurring during fast neutron irradiation. A system interface has been designed and constructed which is capable of controlling the Kaman 710 neutron generator, the sample transfer system, switching the BF3 beam monitor detector or NaI(T1) detector outputs as required to a multichannel scaling MCA, and proper sequencing of the procedure. In addition, specific software has been developed for the control of the system during acquisition as well as evaluation of the MCS spectra generated

  2. Evaluation of new control rooms by operator performance analysis

    International Nuclear Information System (INIS)

    An advanced supervisory and control system called PODIATM (Plant Operation by Displayed Information and Automation) was developed by Toshiba. Since this system utilizes computer driven CRTs as a main device for information transfer to operators, thorough system integration tests were performed at the factory and evaluations were made of operators' assessment from the initial experience of the system. The PODIA system is currently installed at two BWR power plants. Based on the experiences from the development of PODIA, a more advanced man-machine interface, Advanced-PODIA (A-PODIA), is developed. A-PODIA enhances the capabilities of PODIA in automation, diagnosis, operational guidance and information display. A-PODIA has been validated by carrying out systematic experiments with a full-scope simulator developed for the validation. The results of the experiments have been analyzed by the method of operator performance analysis and applied to further improvement of the A-PODIA system. As a feedback from actual operational experience, operator performance data in simulator training is an important source of information to evaluate human factors of a control room. To facilitate analysis of operator performance, a performance evaluation system has been developed by applying AI techniques. The knowledge contained in the performance evaluation system was elicited from operator training experts and represented as rules. The rules were implemented by employing an object-oriented paradigm to facilitate knowledge management. In conclusion, it is stated that the feedback from new control room operation can be obtained at an early stage by validation tests and also continuously by comprehensive evaluation (with the help of automated tools) of operator performance in simulator training. The results of operator performance analysis can be utilized for improvement of system design as well as operator training. (author)

  3. Control of pneumatic transfer system for neutron activation analysis

    International Nuclear Information System (INIS)

    Pneumatic transfer system(PTS) is one of the facilities to be used in irradiation of target materials for neutron activation analysis(NAA) in the research reactor. There are two systems the manual and the automatic system in PTS of HANARO research reactor. The pneumatic transfer system consists of many devices, sends and loads the capsules from NAA laboratory into three holes in the reflector tank of reactor and retrieves irradiated capsules after irradiation. This report describes the part's design, control system and the operation procedures. All the algorithm described in the text will be used for maintenance and upgrading

  4. Control of pneumatic transfer system for neutron activation analysis

    Energy Technology Data Exchange (ETDEWEB)

    Jung, H. S.; Chung, Y. S.; Wu, J. S.; Kim, H. K.; Choi, Y. S.; Kim, S. H.; Moon, J. H.; Baek, S. Y

    2000-06-01

    Pneumatic transfer system(PTS) is one of the facilities to be used in irradiation of target materials for neutron activation analysis(NAA) in the research reactor. There are two systems the manual and the automatic system in PTS of HANARO research reactor. The pneumatic transfer system consists of many devices, sends and loads the capsules from NAA laboratory into three holes in the reflector tank of reactor and retrieves irradiated capsules after irradiation. This report describes the part's design, control system and the operation procedures. All the algorithm described in the text will be used for maintenance and upgrading.

  5. Design and Performance Analysis of ZBT SRAM Controller

    Directory of Open Access Journals (Sweden)

    Smriti Sharma

    2013-07-01

    Full Text Available Memory is an essential part of electronic industry. Since, the processors used in various high performancePCs, network applications and communication equipment require high speed memories. The type ofmemory used depends on system architecture, and its applications. This paper presents an SRAMarchitecture known as Zero Bus Turnaround (ZBT. This ZBT SRAM is mainly developed for networkingapplications where frequent READ/WRITE transitions are required. The other single data rate SRAMs areinefficient as they require idle cycles when they frequently switch between reading and writing to thememory. This controller is simulated on the Spartan 3 device. And the performance analysis is done on thebasis of area, speed and power.

  6. Some aspects of the control and analysis of costs in the steel industry

    OpenAIRE

    C?pu?neanu, Sorinel/I

    2009-01-01

    This article aims to describe the control and cost analysis in actual conditions. There are described the types of analysis and cost control in the enterprise from steel industry of Romania, the stages which an enterprise should follow to take its control and cost analysis.

  7. Measurement precision and biological variation of cranial arteries using automated analysis of 3 T magnetic resonance angiography

    DEFF Research Database (Denmark)

    Amin, Faisal Mohammad; Lundholm, Elisabet

    2014-01-01

    BACKGROUND: Non-invasive magnetic resonance angiography (MRA) has facilitated repeated measurements of human cranial arteries in several headache and migraine studies. To ensure comparability across studies the same automated analysis software has been used, but the intra- and interobserver, day-to-day and side-to-side variations have not yet been published. We hypothesised that the observer related, side-to-side, and day-to-day variations would be less than 10%. METHODS: Ten female participants were studied using high-resolution MRA on two study days separated by at least one week. Using the automated LKEB-MRA vessel wall analysis software arterial circumferences were measured by blinded observers. Each artery was analysed twice by each of the two different observers. The primary endpoints were to determine the intraclass correlation coefficient (ICC) and intra- an inter-observer, the day-to-day, and side-to-side variations of the circumference of the middle meningeal (MMA) and middle cerebral (MCA) arteries. RESULTS: We found an excellent intra- and interobserver agreement for the MMA (ICC: 0.909-0.987) and for the MCA (ICC: 0.876-0.949). The coefficient of variance within observers was ?1.8% for MMA and ?3.1% for MCA; between observers ?3.4% (MMA) and ?4.1% (MCA); between days ?6.0% (MMA) and ?8.0% (MCA); between sides ?9.4% (MMA) and ?6.5% (MCA). CONCLUSION: The present study demonstrates a low (<5%) inter- and intraobserver variation using the automated LKEB-MRA vessel wall analysis software. Furthermore, the study also suggests that the day-to-day and side-to-side variations of the MMA and MCA circumferences are less than 10%.

  8. Performance Analysis: Work Control Events Identified January - August 2010

    Energy Technology Data Exchange (ETDEWEB)

    De Grange, C E; Freeman, J W; Kerr, C E; Holman, G; Marsh, K; Beach, R

    2011-01-14

    This performance analysis evaluated 24 events that occurred at LLNL from January through August 2010. The analysis identified areas of potential work control process and/or implementation weaknesses and several common underlying causes. Human performance improvement and safety culture factors were part of the causal analysis of each event and were analyzed. The collective significance of all events in 2010, as measured by the occurrence reporting significance category and by the proportion of events that have been reported to the DOE ORPS under the ''management concerns'' reporting criteria, does not appear to have increased in 2010. The frequency of reporting in each of the significance categories has not changed in 2010 compared to the previous four years. There is no change indicating a trend in the significance category and there has been no increase in the proportion of occurrences reported in the higher significance category. Also, the frequency of events, 42 events reported through August 2010, is not greater than in previous years and is below the average of 63 occurrences per year at LLNL since 2006. Over the previous four years, an average of 43% of the LLNL's reported occurrences have been reported as either ''management concerns'' or ''near misses.'' In 2010, 29% of the occurrences have been reported as ''management concerns'' or ''near misses.'' This rate indicates that LLNL is now reporting fewer ''management concern'' and ''near miss'' occurrences compared to the previous four years. From 2008 to the present, LLNL senior management has undertaken a series of initiatives to strengthen the work planning and control system with the primary objective to improve worker safety. In 2008, the LLNL Deputy Director established the Work Control Integrated Project Team to develop the core requirements and graded elements of an institutional work planning and control system. By the end of that year this system was documented and implementation had begun. In 2009, training of the workforce began and as of the time of this report more than 50% of authorized Integration Work Sheets (IWS) use the activity-based planning process. In 2010, LSO independently reviewed the work planning and control process and confirmed to the Laboratory that the Integrated Safety Management (ISM) System was implemented. LLNL conducted a cross-directorate management self-assessment of work planning and control and is developing actions to respond to the issues identified. Ongoing efforts to strengthen the work planning and control process and to improve the quality of LLNL work packages are in progress: completion of remaining actions in response to the 2009 DOE Office of Health, Safety, and Security (HSS) evaluation of LLNL's ISM System; scheduling more than 14 work planning and control self-assessments in FY11; continuing to align subcontractor work control with the Institutional work planning and control system; and continuing to maintain the electronic IWS application. The 24 events included in this analysis were caused by errors in the first four of the five ISMS functions. The most frequent cause was errors in analyzing the hazards (Function 2). The second most frequent cause was errors occurring when defining the work (Function 1), followed by errors during the performance of work (Function 4). Interestingly, very few errors in developing controls (Function 3) resulted in events. This leads one to conclude that if improvements are made to defining the scope of work and analyzing the potential hazards, LLNL may reduce the frequency or severity of events. Analysis of the 24 events resulted in the identification of ten common causes. Some events had multiple causes, resulting in the mention of 39 causes being identified for the 24 events. The most frequent cause was workers, supervisors, or experts believing they understood the work and the hazards but their understanding was incomplete. The s

  9. Thermal modeling, analysis and control of a space suit

    Science.gov (United States)

    Campbell, Anthony Bruce

    The thermal dynamics of two space suits, the Space Shuttle EMU and the MPLSS Advanced Space Suit, are considered as they relate to astronaut thermal comfort control. The activities documented in this dissertation cover three related areas, modeling, analysis, and control. A detailed dynamic lumped capacitance thermal model of the operational Space Shuttle EMU is used to analyze the thermal dynamics of the system with observations verified using experimental and flight data. Prior to using the model to define performance characteristics and limitations for the space suit, the model is first evaluated and improved. This evaluation includes determining the effect of various model parameters on model performance and quantifying various temperature prediction errors in terms of heat transfer and heat storage. The thermal dynamics and design of an Advanced Space Suit are next considered. A transient model of the MPLSS Advanced Space Suit design is developed and implemented using MATLAB/Simulink, to help with sizing, with design evaluation, and with the development of an automatic thermal comfort control strategy. The model is described and the thermal characteristics of the Advanced Space Suit are investigated including various parametric design studies. The steady state performance envelope for the Advanced Space Suit is defined in terms of the thermal environment and human metabolic rate and the transient response of the human-suit-MPLSS system is analyzed. The observations and insights about the thermal dynamics of a space suit are then applied to the automatic thermal comfort control of the MPLSS Advanced Space Suit. Automatic thermal comfort control for the Advanced Space Suit is investigated using three proposed strategies. These strategies use a transient thermal comfort definition based on body heat storage. The first strategy is measurement based using a proposed body heat storage estimation method to determine the astronaut's thermal state. The second strategy is model based using a model to determine the desired liquid cooling garment inlet temperature to provide thermal comfort. The third strategy is a hybrid strategy combining the measurement based and model based approach using the Generalized Predictive Control framework. Each strategy then uses a resource allocation decision logic to determine which of three control mechanisms to use so that thermal comfort can be provided while minimizing the use of consumables. Accuracy and performance of the strategies are evaluated using simulations, highlighting their advantages and limitations.

  10. Bifurcation analysis of a Lyapunov-based controlled boost converter

    Science.gov (United States)

    Spinetti-Rivera, Mario; Olm, Josep M.; Biel, Domingo; Fossas, Enric

    2013-11-01

    Lyapunov-based controlled boost converters have a unique equilibrium point, which is globally asymptotically stable, for known resistive loads. This article investigates the dynamic behaviors that appear in the system when the nominal load differs from the actual one and no action is taken by the controller to compensate for the mismatch. Exploiting the fact that the closed-loop system is, in fact, planar and quadratic, one may provide not only local but also global stability results: specifically, it is proved that the number of equilibria of the converter may grow up to three and that, in any case, the system trajectories are always bounded, i.e. it is a bounded quadratic system. The possible phase portraits of the closed-loop system are also characterized in terms of the selected bifurcation parameters, namely, the actual load value and the gain of the control law. Accordingly, the analysis allows the numerical illustration of many bifurcation phenomena that appear in bounded quadratic systems through a physical example borrowed from power electronics.

  11. An Analysis of the Control Hierarchy Modelling of the CMS Detector Control System

    International Nuclear Information System (INIS)

    The supervisory level of the Detector Control System (DCS) of the CMS experiment is implemented using Finite State Machines (FSM), which model the behaviours and control the operations of all the sub-detectors and support services. The FSM tree of the whole CMS experiment consists of more than 30.000 nodes. An analysis of a system of such size is a complex task but is a crucial step towards the improvement of the overall performance of the FSM system. This paper presents the analysis of the CMS FSM system using the micro Common Representation Language 2 (mcrl2) methodology. Individual mCRL2 models are obtained for the FSM systems of the CMS sub-detectors using the ASF+SDF automated translation tool. Different mCRL2 operations are applied to the mCRL2 models. A mCRL2 simulation tool is used to closer examine the system. Visualization of a system based on the exploration of its state space is enabled with a mCRL2 tool. Requirements such as command and state propagation are expressed using modal mu-calculus and checked using a model checking algorithm. For checking local requirements such as endless loop freedom, the Bounded Model Checking technique is applied. This paper discusses these analysis techniques and presents the results of their application on the CMS FSM system.

  12. Detection of the East and West African kdr mutation in Anopheles gambiae and Anopheles arabiensis from Uganda using a new assay based on FRET/Melt Curve analysis

    Directory of Open Access Journals (Sweden)

    Backeljau Thierry

    2006-02-01

    Full Text Available Abstract Background Appropriate monitoring of vector resistance to insecticides is an integral component of planning and evaluation of insecticide use in malaria control programmes. The malaria vectors Anopheles gambiae s.s. and Anopheles arabiensis have developed resistance to pyrethroid insecticides as a result of a mechanism conferring reduced nervous system sensitivity, better known as knockdown resistance (kdr. In An. gambiae s.s. and An. arabiensis, two different substitutions in the para-type sodium channel, a L1014F substitution common in West Africa and a L1014S replacement found in Kenya, are linked with kdr. Two different allele-specific polymerase chain reactions (AS-PCR are needed to detect these known kdr mutations. However, these AS-PCR assays rely on a single nucleotide polymorphism mismatch, which can result in unreliable results. Methods Here, a new assay for the detection of knockdown resistance in An. gambiae s.s. and An. arabiensis based on Fluorescence Resonance Energy Transfer/Melt Curve analysis (FRET/MCA is presented and compared with the existing assays. Results The new FRET/MCA method has the important advantage of detecting both kdr alleles in one assay. Moreover, results show that the FRET/MCA is more reliable and more sensitive than the existing AS-PCR assays and is able to detect new genotypes. By using this technique, the presence of the East African kdr mutation (L1014S is shown for the first time in An. arabiensis specimens from Uganda. In addition, a new kdr genotype is reported in An. gambiae s.s. from Uganda, where four An. gambiae s.s. mosquitoes possess both, the West (L1014F and East (L1014S African kdr allele, simultaneously. Conclusion The presence of both kdr mutations in the same geographical region shows the necessity of a reliable assay that enables to detect both mutations in one single assay. Hence, this new assay based on FRET/MCA will improve the screening of the kdr frequencies in An. gambiae s.s. and An. arabiensis.

  13. QUALITATIVE ANALYSIS OF CONTROLLED RELEASE OFLOXACIN / HPMC MUCOADHESIVE SUSPENSION

    Directory of Open Access Journals (Sweden)

    Sahoo Subhashree

    2011-06-01

    Full Text Available Mucoadhesive polymeric (HPMC suspension of Ofloxacin was prepared and optimised with the aim of developing an oral controlled release gastro-retentive dosage form. The qualitative analysis of the formulation was performed by FTIR, Raman Spectroscopy, XRD and SEM analyses. Ultrasonication method was used for preparation of mucoadhesive Ofloxacin suspension. FTIR (400 cm-1 to 4000 cm-1 region and Raman (140 to 2400 cm-1 region Spectroscopic studies were carried out and spectra were used for interpretation. X-ray powder diffraction (XRD data of pure drug, polymer and the formulation were obtained using a powder diffractometer, scanned from a Bragg’s angle (2? of 10? to 70?. The dispersion of particle was observed using Scanning electron microscopy (SEM techniques. The particle size distribution (PSD and aspect ratio (AR of particles in the polymeric suspension were obtained from SEM image analysis. The results from FTIR and Raman Spectroscopic analyses suggested that in formulation, the carboxylic groups of Ofloxacin and hydroxyl groups of HPMC undergo chemical interaction leading to esterification and hydrogen bonding (both intermolecular and polymeric. The XRD data suggested that the retention of crystalline nature of Ofloxacin in the formulation would lead to increase in stability and drug loading; decrease in solubility and delayed release of the drug from polymeric suspension with better bioavailability and penetration capacity. The SEM image analysis indicated that in the formulation maximum particles were having aspect ratio from 2 to 4 and standard deviation was very less, which provided supporting evidences for homogeneous, uniformly dispersed, stable controlled release Ofloxacin suspension which would be pharmaceutically acceptable.

  14. Analysis and control of issues that delay pharmaceutical projects

    Directory of Open Access Journals (Sweden)

    Nallam Sai Nandeswara Rao

    2015-10-01

    Full Text Available Every project will have certain objectives and service levels to be achieved. The success of a project depends on several dimensions like time, cost/budget, quality, etc. and managing a project involves completing the project within time, within budget and with quality to satisfy the users. Because of the significance of health, pharmaceutical companies realized the importance of project management methods and techniques to make available the life saving drugs in time to the needy patients and hospitals. In literature, there is meager information about pharmaceutical project management oriented towards analysis of issues and factors that contribute to the failure or success of projects. This study attempts to analyse different issues that contribute to time delays in pharmaceutical product-based projects, group them under a finite set of prominent factors and identify remedial measures to control those delays. The feedback of project people of some big pharmaceutical firms of Indian sub-continent was collected for this purpose. Exploratory factor analysis (EFA has been used to reduce the reasons for time delays to a limited number of prominent factors and the EFA model has been further examined by confirmatory factor analysis (CFA for its validation. Remedial measures under each factor of time delays have been gathered and a framework designed to mitigate the time delays in pharmaceutical projects. The derived factors that delay the pharmaceutical projects include resource, monitoring & control, scheduling and planning problems. Important remedial measures like blended resource approach, estimation and forecast of shortage of labour and skills, regular quality training, etc. have been recommended.

  15. The value of standards. Essay on a cost-benefit analysis of environmental policy. Final report

    International Nuclear Information System (INIS)

    In practice, societal cost-benefit analysis (MKBA in Dutch), multicriteria analysis (MCA) and cost effectiveness analysis are applied to compare the costs and beneficial effects of governmental policies. In this report attention is paid to the societal benefits and the economic impacts of environmental standards

  16. A modified VIKOR method for multiple criteria analysis.

    Science.gov (United States)

    Chang, Chia-Ling

    2010-09-01

    The VIKOR method was developed to solve multiple criteria decision making (MCDM) problems with conflicting or non-commensurable criteria. This method assumes that compromising is acceptable for conflicting resolution. Although the VIKOR method is a popular method applied in multi-criteria analysis (MCA), it has some problems when solving MCDM problems. This study discussed existing problems in the traditional VIKOR method. The objective of this study was to develop a modified VIKOR method to avoid numerical difficulties in solving problems by the traditional VIKOR method. Several synthetic experiments were designed and assessed to verify the improvement of solution efficiency of the modified VIKOR method in MCA. PMID:19672684

  17. Heat-treatment control by means of acoustic emission analysis

    International Nuclear Information System (INIS)

    In acoustic emission, sound waves are emitted by fast release of elastically accumulated energy, the frequency of which extends from audible sound up to supersonic frequencies. The causes for the production of sound are chiefly plastic deformation, phase transformations, crack formation, rupture and friction phenomena. By analyzing the acoustic signals according to origin, amplitudes, frequency, pulse rate, and pulse sum, detailed statements can be made on the behavior of materials under stress. In this summarizing paper, all basic problems of acoustic emission analysis are presented in detail by the example of heat-treatment control (welding, hardening, tempering, annealing) including disturbing effect (formation of steam bubbles, scaling etc.). Quantification of the evidence from acoustic emission analysis in the sense of assigning the signals to type and size of faults is still being worked upon. Acoustic emission analysis until now could be applied successfully mainly to large components such like, e.g., reactor pressure vessels and pipes. Detailed results are given for the individual heat-treatment process. (orig.)

  18. Risk Analysis in Robust Control -- Making the Case for Probabilistic Robust Control

    CERN Document Server

    Chen, Xinjia; Zhou, Kemin

    2007-01-01

    This paper offers a critical view of the "worst-case" approach that is the cornerstone of robust control design. It is our contention that a blind acceptance of worst-case scenarios may lead to designs that are actually more dangerous than designs based on probabilistic techniques with a built-in risk factor. The real issue is one of modeling. If one accepts that no mathematical model of uncertainties is perfect then a probabilistic approach can lead to more reliable control even if it cannot guarantee stability for all possible cases. Our presentation is based on case analysis. We first establish that worst-case is not necessarily "all-encompassing." In fact, we show that for some uncertain control problems to have a conventional robust control solution it is necessary to make assumptions that leave out some feasible cases. Once we establish that point, we argue that it is not uncommon for the risk of unaccounted cases in worst-case design to be greater than that of the accepted risk in a probabilistic appro...

  19. Spatial control of groundwater contamination, using principal component analysis

    Indian Academy of Sciences (India)

    N Subba Rao

    2014-06-01

    A study on the geochemistry of groundwater was carried out in a river basin of Andhra Pradesh to probe into the spatial controlling processes of groundwater contamination, using principal component analysis (PCA). The PCA transforms the chemical variables, pH, EC, Ca2+, Mg2+, Na+, K+, HCO$^{?}_{3}$, Cl?, SO$^{2?}_{4}$, NO$^{?}_{3}$ and F?, into two orthogonal principal components (PC1 and PC2), accounting for 75% of the total variance of the data matrix. PC1 has high positive loadings of EC, Na+, Cl?, SO$^{2?}_{4}$, Mg2+ and Ca2+, representing a salinity controlled process of geogenic (mineral dissolution, ion exchange, and evaporation), anthropogenic (agricultural activities and domestic wastewaters), and marine (marine clay) origin. The PC2 loadings are highly positive for HCO$^{?}_{3}$, F?, pH and NO$^{?}_{3}$, attributing to the alkalinity and pollution controlled processes of geogenic and anthropogenic origins. The PC scores reflect the change of groundwater quality of geogenic origin from upstream to downstream area with an increase in concentration of chemical variables, which is due to anthropogenic and marine origins with varying topography, soil type, depth of water levels, and water usage. Thus, the groundwater quality shows a variation of chemical facies from Na+ > Ca2+ > Mg2+ > K+: HCO$^{?}_{3}$ > Cl? > SO$^{2?}_{4}$ > NO$^{?}_{3}$ > F? at high topography to Na+ > Mg2+ > Ca2+ > K+: Cl? > HCO$^{?}_{3}$ > SO$^{2?}_{4}$ > NO$^{?}_{3}$ > F? at low topography. With PCA, an effective tool for the spatial controlling processes of groundwater contamination, a subset of explored wells is indexed for continuous monitoring to optimize the expensive effort.

  20. Austrian meat: Authenticity control by stable isotope analysis

    International Nuclear Information System (INIS)

    Full text: The EU has declared that all foodstuff must be able to be traced back from 'fork to farm' to increase the safety of food and the confidence of the consumers in food quality and safety. Additionally, several incidents of 'food diseases and scandals' related with meat (e.g.: BSE, foot and mouth disease, antibiotics abuse, avian flu, etc.) have demonstrated the necessity to trace back the origin of meat, to be able to locate sources of infection/mismanagement. Besides the conventional method of the control of documentation there is the possibility of control of origin by analysing the isotopic composition of meat and herewith controlling the questioned good itself. Stable isotope ratios of the elements HCNOS are varying geographically due to different environmental conditions (e.g.: climate, geology, soil, altitude, geography, etc.) thus every region possesses an individual pattern. The isotopic pattern is imprinted on plants and animals growing in a certain region, and therefore analysis of the stable isotope pattern can allow the identification of agricultural goods from different regions. For the control of origin of Austrian meat about 500 beef and 500 pork samples have been collected from slaughterhouses and were analysed for the isotopic composition of carbon, nitrogen, oxygen and sulphur and compared with the isotopic composition of meat samples from neighbouring countries. As Austria, despite being a small country, is very heterogeneous in its environmental conditions, thus there are significant differences in the isotopic patterns of individual Austrian provinces. The isotopic signature of meat samples from neighbouring countries can overlap with the 'Austrian isotope pattern' due to similar environmental conditions. However, a correct statistical classification has been achieved for 80% and 84% of the analysed beef and pork samples, respectively. If the declared origin of meat can be pinned down to an Austrian province, the discrimination power of the database is even significantly better. (author)

  1. Control-structure-thermal interactions in analysis of lunar telescopes

    Science.gov (United States)

    Thompson, Roger C.

    1992-01-01

    The lunar telescope project was an excellent model for the CSTI study because a telescope is a very sensitive instrument, and thermal expansion or mechanical vibration of the mirror assemblies will rapidly degrade the resolution of the device. Consequently, the interactions are strongly coupled. The lunar surface experiences very large temperature variations that range from approximately -180 C to over 100 C. Although the optical assemblies of the telescopes will be well insulated, the temperature of the mirrors will inevitably fluctuate in a similar cycle, but of much smaller magnitude. In order to obtain images of high quality and clarity, allowable thermal deformations of any point on a mirror must be less than 1 micron. Initial estimates indicate that this corresponds to a temperature variation of much less than 1 deg through the thickness of the mirror. Therefore, a lunar telescope design will most probably include active thermal control, a means of controlling the shape of the mirrors, or a combination of both systems. Historically, the design of a complex vehicle was primarily a sequential process in which the basic structure was defined without concurrent detailed analyses or other subsystems. The basic configuration was then passed to the different teams responsible for each subsystem, and their task was to produce a workable solution without requiring major alterations to any principal components or subsystems. Consequently, the final design of the vehicle was not always the most efficient, owing to the fact that each subsystem design was partially constrained by the previous work. This procedure was necessary at the time because the analysis process was extremely time-consuming and had to be started over with each significant alteration of the vehicle. With recent advances in the power and capacity of small computers, and the parallel development of powerful software in structural, thermal, and control system analysis, it is now possible to produce very detailed analyses of intermediate designs in a much shorter period of time. The subsystems can thus be designed concurrently, and alterations in the overall design can be quickly adopted into each analysis; the design becomes an iterative process in which it is much easier to experiment with new ideas, configurations, and components. Concurrent engineering has the potential to produce efficient, highly capable designs because the effect of one subystem on another can be assessed in much more detail at a very early point in the program. The research program consisted of several tasks: scale a prototype telescope assembly to a 1 m aperture, develop a model of the telescope assembly by using finite element (FEM) codes that are available on site, determine structural deflections of the mirror surfaces due to the temperature variations, develop a prototype control system to maintain the proper shape of the optical elements, and most important of all, demonstrate the concurrent engineering approach with this example. In addition, the software used for the finite element models and thermal analysis was relatively new within the Program Development Office and had yet to be applied to systems this large or complex; understanding the software and modifying it for use with this project was also required. The I-DEAS software by Structural Dynamics Research Corporation (SDRC) was used to build the finite element models, and TMG developed by Maya Heat Transfer Technologies, Ltd. (which runs as an I-DEAS module) was used for the thermal model calculations. All control system development was accomplished with MATRIX(sub X) by Integrated Systems, Inc.

  2. Strain control magnetocrystalline anisotropy of Ta/FeCo/MgO heterostructures

    International Nuclear Information System (INIS)

    Using ab initio electronic structure calculations, we have investigated the effect of epitaxial strain on magnetocrystalline anisotropy (MCA) of Ta/FeCo/MgO heterostructure. At small expansive strains on the FeCo layer, the system exhibits perpendicular MCA (PMA). Strain not only has a profound effect on the value of MCA but also induces a switching of magnetic easy axis. Analysis of the energy- and k-resolved distribution of orbital characters of the minority-spin band reveals that a significant contribution to PMA at zero strain arises from the spin-orbit coupling between occupied dx2?y2 and unoccupied dxy states, derived from Fe at the FeCo/MgO interface. The strain effect is attributed to strain-induced shifts of spin-orbit coupled d-states. Our work demonstrates that strain engineering can open a viable pathway towards tailoring magnetic properties for spintronic applications

  3. Quality control for Analysis of anthropogenic radioactivity at MRI

    International Nuclear Information System (INIS)

    Monitoring of 90Sr, 137Cs and 239,240Pu in the atmospheric deposition samples has been continued for longer than 40 years at the Meteorological Research Institute, Japan (MRI). Our company (KANSO) has been in charge of the analyses of these radionuclides as a contractor for the recent several years. It is basic requirements to produce good quality data for the contractor in the long-term monitoring; each technician engaged in the analyses should not have the skill difference. Furthermore, the data produced should not involve any bias and whatever problems. We have, therefore, carried out the analytical quality control and assurance QC/QA) by using the MRI reference fallout material for radioactivity along with analysis of the real samples. In the present work, those results of the QC/QA at the MRI by the KANSO are presented. For the analyses of 90Sr (n=65) and 137Cs (n=158), good quality control has been achieved; the coefficient of variations were fairly small, less than 5%. Also, the deviation from the reference values for these two nuclides were within 2%. While for the analysis of 239,240Pu (n=40), the coefficient of variation was worse, almost 10%. The deviation from the reference values for Pu isotopes were worse, about 10%, as well. From the normalized frequency distribution for the data, it was shown that 90Sr and 137Cs have good normal distributions. While the 239,240Pu data showed slightly disturbed frequency distribution. This difference does not seem attributable to the skill level of the technicians engaged but the inhomogeneity of the 239,240Pu in the reference fallout material itself. The control plots were depicted to see if any low quality data. From this time series data analysis, few deviated data were found. The deviated data were not attributable for the replace of the technicians and equipments but probability reason. As a whole, good QC/QA was practically achieved in the analyses of 90Sr, 137Cs and 239,240Pu in the atmospheric deposition samples by the contractor, KANSO, at the MRI, Japan. (author)

  4. LSAP-DIGLIB, Linear Control System Design, Analysis, Plotting

    International Nuclear Information System (INIS)

    1 - Description of program or function: LSAP (Linear Systems Analysis Program) is an interactive program with graphics capability provided through DIGLIB (Device Independent Graphics Library) that can be used for the analysis and design of linear control systems. Nearly all the classical design tools are available, including manipulation of transfer functions and generation of root locus, time response, and frequency response plots. The program is capable of working with continuous time systems and sampled data systems. For continuous time systems, the Laplace transform is used and for sampled data systems, the Z-transform is used. The capability to convert from a Laplace to a Z-transform is provided. The program is intended primarily for the analysis of feedback control systems. The system configuration or parameters can be changed easily, allowing the user to design compensation networks and perform sensitivity analyses in a very convenient manner. DIGLIB is a collection of general graphics subroutines. It was designed to be small, reasonably fast, device-independent, and compatible with RT-11, RSX-11M, and VMS and readily usable by casual programmers for two-dimensional plotting. DIGLIB has device drivers for Tektronix 4010, 4012, 4014, 4025, and 4027 terminals; VT100 terminals with the retro-graphics option; GIGI terminals, CalComp 1012 plotters, and Lexidata 3400 color graphics systems. 2 - Method of solution: LSAP performs its modeling by defining and operating upon polynomial fraction representations of transfer functions. It is a command oriented program. A command is entered, together with any necessary data, and then executed. The program is then ready for the next command. The MAIN procedure accepts a command and calls the appropriate command procedure, until the program is halted. Each command procedure uses any utilities required for the execution of the command. The commands interact with global data in two basic ways. All defined transfer functions are global records, which exist in a linked list. All commands except HALT and HELP operate upon these records. Also included in global data are switches, flags, pointers, and scalars which describe the state of the program and control the operations performed by the commands. 3 - Restrictions on the complexity of the problem: The program can only be applied to systems which can be described by a collection of rational transfer functions that are either Laplace or Z-transforms. The order of the numerator or denominator polynomials cannot exceed 20

  5. Computer Models for IRIS Control System Transient Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Gary D. Storrick; Bojan Petrovic; Luca Oriani

    2007-01-31

    This report presents results of the Westinghouse work performed under Task 3 of this Financial Assistance Award and it satisfies a Level 2 Milestone for the project. Task 3 of the collaborative effort between ORNL, Brazil and Westinghouse for the International Nuclear Energy Research Initiative entitled “Development of Advanced Instrumentation and Control for an Integrated Primary System Reactor” focuses on developing computer models for transient analysis. This report summarizes the work performed under Task 3 on developing control system models. The present state of the IRIS plant design – such as the lack of a detailed secondary system or I&C system designs – makes finalizing models impossible at this time. However, this did not prevent making considerable progress. Westinghouse has several working models in use to further the IRIS design. We expect to continue modifying the models to incorporate the latest design information until the final IRIS unit becomes operational. Section 1.2 outlines the scope of this report. Section 2 describes the approaches we are using for non-safety transient models. It describes the need for non-safety transient analysis and the model characteristics needed to support those analyses. Section 3 presents the RELAP5 model. This is the highest-fidelity model used for benchmark evaluations. However, it is prohibitively slow for routine evaluations and additional lower-fidelity models have been developed. Section 4 discusses the current Matlab/Simulink model. This is a low-fidelity, high-speed model used to quickly evaluate and compare competing control and protection concepts. Section 5 describes the Modelica models developed by POLIMI and Westinghouse. The object-oriented Modelica language provides convenient mechanisms for developing models at several levels of detail. We have used this to develop a high-fidelity model for detailed analyses and a faster-running simplified model to help speed the I&C development process. Section 6 describes an ACSL model that Westinghouse started but suspended developing for the moment. ACSL is an old simulation language that Westinghouse used on many projects. It may (or may not) offer some advantages during the later stages of detailed plant design and analysis, but supporting the ACSL model does not appear to be necessary at this time. Section 7 summarizes our expectations for future development.

  6. Computer Models for IRIS Control System Transient Analysis

    International Nuclear Information System (INIS)

    This report presents results of the Westinghouse work performed under Task 3 of this Financial Assistance Award and it satisfies a Level 2 Milestone for the project. Task 3 of the collaborative effort between ORNL, Brazil and Westinghouse for the International Nuclear Energy Research Initiative entitled 'Development of Advanced Instrumentation and Control for an Integrated Primary System Reactor' focuses on developing computer models for transient analysis. This report summarizes the work performed under Task 3 on developing control system models. The present state of the IRIS plant design--such as the lack of a detailed secondary system or I and C system designs--makes finalizing models impossible at this time. However, this did not prevent making considerable progress. Westinghouse has several working models in use to further the IRIS design. We expect to continue modifying the models to incorporate the latest design information until the final IRIS unit becomes operational. Section 1.2 outlines the scope of this report. Section 2 describes the approaches we are using for non-safety transient models. It describes the need for non-safety transient analysis and the model characteristics needed to support those analyses. Section 3 presents the RELAP5 model. This is the highest-fidelity model used for benchmark evaluations. However, it is prohibitively slow for routine evaluations and additional lower-fidelity models have been developed. Section 4 discusses the current Matlab/Simulink model. This is a low-fidelity, high-speed model used to quickly evaluate and compare competing control and protection concepts. Section 5 describes the Modelica models developed by POLIMI and Westinghouse. The object-oriented Modelica language provides convenient mechanisms for developing models at several levels of detail. We have used this to develop a high-fidelity model for detailed analyses and a faster-running simplified model to help speed the I and C development process. Section 6 describes an ACSL model that Westinghouse started but suspended developing for the moment. ACSL is an old simulation language that Westinghouse used on many projects. It may (or may not) offer some advantages during the later stages of detailed plant design and analysis, but supporting the ACSL model does not appear to be necessary at this time. Section 7 summarizes our expectations for future development

  7. Diffusing wave spectroscopy applied to material analysis and process control

    International Nuclear Information System (INIS)

    Diffusing Wave Spectroscopy (DWS) was studied as a method of laboratory analysis of sub-micron particles, and developed as a prospective in-line, industrial, process control sensor, capable of near real-time feedback. No sample pre-treatment was required and measurement was via a non-invasive, flexible, dip in probe. DWS relies on the concept of the diffusive migration of light, as opposed to the ballistic scatter model used in conventional dynamic light scattering. The specific requirements of the optoelectronic hardware, data analysis methods and light scattering model were studied experimentally and, where practical, theoretically resulting in a novel technique of analysis of particle suspensions and emulsions of volume fractions between 0.01 and 0.4. Operation at high concentrations made the technique oblivious to dust and contamination. A pure homodyne (autodyne) experimental arrangement described was resilient to environmental disturbances, unlike many other systems which utilise optical fibres or heterodyne operation. Pilot and subsequent prototype development led to a highly accurate method of size ranking, suitable for analysis of a wide range of suspensions and emulsions. The technique was shown to operate on real industrial samples with statistical variance as low as 0.3% with minimal software processing. Whilst the application studied was the analysis of TiO2 suspensions, a diverse range of materials including polystyrene beads, cell pastes and industrial cutting fluid emulsions were tested. Results suggest that, whilst all sizing should be comparative to suitable standards, concentration effects may be minimised and even completely modelled-out in many applications. Adhesion to the optical probe was initially a significant problem but was minimised after the evaluation and use of suitable non stick coating materials. Unexpected behaviour in the correlation in the region of short decay times led to consideration of the effects of rotational diffusion coefficient. The inherent instability of high density suspensions instigated high speed analysis techniques capable of monitoring suspensions that were undergoing rapid change as well as suggesting novel methods for the evaluation of the state of sample dispersion. (author)

  8. Integrated Model Reduction and Control of Aircraft with Flexible Wings

    Science.gov (United States)

    Swei, Sean Shan-Min; Zhu, Guoming G.; Nguyen, Nhan T.

    2013-01-01

    This paper presents an integrated approach to the modeling and control of aircraft with exible wings. The coupled aircraft rigid body dynamics with a high-order elastic wing model can be represented in a nite dimensional state-space form. Given a set of desired output covariance, a model reduction process is performed by using the weighted Modal Cost Analysis (MCA). A dynamic output feedback controller, which is designed based on the reduced-order model, is developed by utilizing output covariance constraint (OCC) algorithm, and the resulting OCC design weighting matrix is used for the next iteration of the weighted cost analysis. This controller is then validated for full-order evaluation model to ensure that the aircraft's handling qualities are met and the uttering motion of the wings suppressed. An iterative algorithm is developed in CONDUIT environment to realize the integration of model reduction and controller design. The proposed integrated approach is applied to NASA Generic Transport Model (GTM) for demonstration.

  9. Cost-effectiveness analysis in Chagas' disease vectors control interventions

    Directory of Open Access Journals (Sweden)

    A. M. Oliveira Filho

    1989-01-01

    Full Text Available After a large scale field trial performed in central Brazil envisaging the control of Chagas' disease vectors in an endemic area colonized by Triatoma infestans and T. sordida the cost-effectiveness analysis for each insecticide/formulation was performed. It considered the operational costs and the prices of insecticides and formulations, related to the activity and persistence of each one. The end point was considered to be less than 90% of domicilliary unitis (house + annexes free of infestation. The results showed good cost-effectiveness for a slow-release emulsifiable suspension (SRES based on PVA and containing malathion as active ingredient, as well as for the pyrethroids tested in this assay-cyfluthrin, cypermethrin, deltamethrin and permethrin.

  10. Control of the boiling crisis: analysis of a model system

    International Nuclear Information System (INIS)

    Controlling the transition between the low (nucleate) and high temperature (film) regimes of boiling is a serious challenge for a number of technological applications. Based on the theoretical analysis of a simplified reaction-diffusion model, it has recently been shown that the transition towards the dangerous situation where the high temperature phase tends to invade the whole system requires a higher power in a periodically spatially modulated system than in an homogeneous system. We show here that the transition mechanisms between the various boiling regimes depend on the ratio between the periodicity length along the wire and the characteristic thermal diffusion length. We analyse theoretically a simple experimental setup aimed at testing these ideas. The heater consists of a thin wire, with an applied electric current, with alternatively low resistance and high resistance sections. We determine the gain in stability for a set of realistic values of the parameters. (authors)

  11. Root cause analysis to support infection control in healthcare premises.

    Science.gov (United States)

    Venier, A-G

    2015-04-01

    Infection control teams (ICTs) seek to prevent healthcare-associated infections (HCAIs). They undertake surveillance and prevention, promote safety and quality of care, and evaluate and manage risk. Root cause analysis (RCA) can support this work but is not widely used by ICTs. This paper describes how ICTs can use RCA to enhance their day-to-day work. Many different tools and methods exist for RCA. Its primary aim is to identify the factors that have led to HCAI, but RCA can also be used for near-misses. A team effort and multidisciplinary work are usually required. Published accounts and personal experience in the field indicate that an ICT that correctly uses RCA implements more effective prevention measures, improves practice and collaborative working, enhances teamwork, and reduces the risk of HCAI. RCA should be promoted among ICTs because it adds value to their work and helps to develop a hospital culture that anticipates and pre-empts problems. PMID:25634490

  12. Quality control of coins mint using PIXE and RBS analysis

    Science.gov (United States)

    Roumie, M.; Nsouli, B.; Chalhoub, G.; Hamdan, M.

    2010-06-01

    PIXE and RBS analysis is used to investigate the elemental content of modern Lebanese coins, in order to control their minting quality. The coins of interest were 100, 250 and 500 Lebanese Lira (LL), which are mainly bulky metals with or without coated layer. Using 3 MeV protons, proton induced X-ray emission PIXE identified and quantified elements while Rutherford backscattering spectrometry RBS checked the thickness of the coated layer. Indeed, the combination of PIXE and RBS provides a powerful tool to investigate the elemental composition of coins, either modern or ancient. In addition, the experimental protocol was checked by analyzing some other coins of known composition, such as 1-euro and 2-euro.

  13. Quality control of coins mint using PIXE and RBS analysis

    International Nuclear Information System (INIS)

    PIXE and RBS analysis is used to investigate the elemental content of modern Lebanese coins, in order to control their minting quality. The coins of interest were 100, 250 and 500 Lebanese Lira (LL), which are mainly bulky metals with or without coated layer. Using 3 MeV protons, proton induced X-ray emission PIXE identified and quantified elements while Rutherford backscattering spectrometry RBS checked the thickness of the coated layer. Indeed, the combination of PIXE and RBS provides a powerful tool to investigate the elemental composition of coins, either modern or ancient. In addition, the experimental protocol was checked by analyzing some other coins of known composition, such as 1-euro and 2-euro.

  14. Model analysis of mechanisms controlling pneumatic soil vapor extraction

    DEFF Research Database (Denmark)

    HØier, Camilla Kruse; Sonnenborg, Torben Obel

    2009-01-01

    The efficiency of traditional soil venting or soil vapor extraction (SVE) highly depends on the architecture of the subsurface because imposed advective air flow tends to bypass low-permeable contaminated areas. Pneumatic SVE is a technique developed to enhance remediation efficiency of heterogeneous soils by enforcing large fluctuating pressure fronts through the contaminated area. Laboratory experiments have suggested that pneumatic SVE considerably improves the recovery rate from low-permeable units. We have analyzed the experimental results using a numerical code and quantified the physical processes controlling the functioning of the method. A sensitivity analysis for selected boundary conditions, initial conditions and parameters was carried out to examine how the method behaves under conditions different from the experimental set-up. The simulations show that at the laboratory level the pneumatic venting technology is superior to the traditional technique, and that the method is particularly efficient in cases where large permeability contrasts exist between soil units in the subsurface.

  15. Cost-effectiveness analysis in Chagas' disease vectors control interventions

    Scientific Electronic Library Online (English)

    A. M., Oliveira Filho.

    Full Text Available After a large scale field trial performed in central Brazil envisaging the control of Chagas' disease vectors in an endemic area colonized by Triatoma infestans and T. sordida the cost-effectiveness analysis for each insecticide/formulation was performed. It considered the operational costs and the [...] prices of insecticides and formulations, related to the activity and persistence of each one. The end point was considered to be less than 90% of domicilliary unitis (house + annexes) free of infestation. The results showed good cost-effectiveness for a slow-release emulsifiable suspension (SRES) based on PVA and containing malathion as active ingredient, as well as for the pyrethroids tested in this assay-cyfluthrin, cypermethrin, deltamethrin and permethrin.

  16. Comparative Analysis of Congestion Control Algorithms Using ns-2

    CERN Document Server

    Patel, Sanjeev; Garg, Arjun; Mehrotra, Prateek; Chhabra, Manish

    2012-01-01

    In order to curtail the escalating packet loss rates caused by an exponential increase in network traffic, active queue management techniques such as Random Early Detection (RED) have come into picture. Flow Random Early Drop (FRED) keeps state based on instantaneous queue occupancy of a given flow. FRED protects fragile flows by deterministically accepting flows from low bandwidth connections and fixes several shortcomings of RED by computing queue length during both arrival and departure of the packet. Stochastic Fair Queuing (SFQ) ensures fair access to network resources and prevents a busty flow from consuming more than its fair share. In case of (Random Exponential Marking) REM, the key idea is to decouple congestion measure from performance measure (loss, queue length or delay). Stabilized RED (SRED) is another approach of detecting nonresponsive flows. In this paper, we have shown a comparative analysis of throughput, delay and queue length for the various congestion control algorithms RED, SFQ and REM...

  17. An Analysis of the Control Hierarchy Modeling of the CMS Detector Control System

    CERN Document Server

    Ling Hwong, Yi

    2010-01-01

    The supervisory level of the Detector Control System (DCS) of the CMS experiment is implemented using Finite State Machines (FSM), which model the behaviors and control the operations of all the sub-detectors and support services. The FSM tree of the whole CMS experiment consists of more than 30.000 nodes. An analysis of a system of such size is a complex task but is a crucial step towards the improvement of the overall performance of the FSM system. This paper presents the analysis of the CMS FSM system using the micro Common Representation Language 2 (mcrl2) methodology. Individual mCRL2 models are obtained for the FSM systems of the CMS sub-detectors using the ASF+SDF automated translation tool. Different mCRL2 operations are applied to the mCRL2 models. A mCRL2 simulation tool is used to closer examine the system. Visualization of a system based on the exploration of its state space is enabled with a mCRL2 tool. Requirements such as command and state propagation are expressed using modal mu-calculus and c...

  18. Automation of low energy gamma spectrometric analysis of mineral samples

    International Nuclear Information System (INIS)

    An interface device to perform the automatic operation of a multichannel analyser CANBERRA S30 from a COMODORE 64 microcomputer was developed. The interface also allows the manual control of the MCA and fulfills the requirements of low cost and simplicity

  19. Analysis of Control Strategies for Diode Clamped Multilevel Inverter

    Directory of Open Access Journals (Sweden)

    C. R. Balamurugan

    2013-05-01

    Full Text Available This paper presents the comparison of various Pulse Width Modulation (PWM strategies for the three phase Diode Clamped Multi Level Inverter (DCMLI. The main contribution of this paper is the proposal of new modulation schemes with Variable Amplitude (VA and various new schemes adopting the constant switching frequency and also variable switching frequency multicarrier control freedom degree combination concepts are developed and simulated for the chosen three phase DCMLI. The three phase DCMLI, is controlled in this paper with Sinusoidal PWM (SPWM reference along with triangular carriers and analysis is made among both without carrier overlapping and with Carrier Overlapping (CO techniques to choose the better strategy by performing simulation using MATLAB-SIMULINK. The variation of Total Harmonic Distortion (THD and fundamental RMS output voltage is observed for various modulation indices. It is observed that among the various equal amplitude PWM strategies, COPWM-C provides less THD and higher RMS voltage. It is recognized that among the various variable amplitude PWM strategies, VACOPWM-C provides less THD and VACOPWM-B provides higher RMS voltage. By comparing the equal amplitude PWM strategies with the variable amplitude PWM strategies it is inferred that VACOPWM-C provides less THD and VACOPWM-B provides higher RMS voltage. It is also inferred that carrier overlapping techniques provides better results compared to the without carrier overlapping techniques.

  20. Introduction to time-delay systems analysis and control

    CERN Document Server

    Fridman, Emilia

    2014-01-01

    The beginning of the 21st century can be characterized as the ”time-delay boom” leading to numerous important results. The purpose of this book is two-fold, to familiarize the non-expert reader with time-delay systems and to provide a systematic treatment of modern ideas and techniques for experts. This book is based on the course ”Introduction to time-delay systems” for graduate students in Engineering and Applied Mathematics that the author taught in Tel Aviv University in 2011-2012 and 2012-2013 academic years. The sufficient background to follow most of the material are the undergraduate courses in mathematics and an introduction to control. The book leads the reader from some basic classical results on time-delay systems to recent developments on Lyapunov-based analysis and design with applications to the hot topics of sampled-data and network-based control. The objective is to provide useful tools that will allow the reader not only to apply the existing methods, but also to develop new ones. It...

  1. Fast neutron activation analysis and radioisotope X-ray fluorescence study on KALEWA and NAMMA coal

    International Nuclear Information System (INIS)

    Kalewa coal was studied with Fast Neutron Activation Analysis (FNAA) technique, employing KAMAN A-710 neutron generator and HP(Ge) detector coupled to ''Canberra'' series 30 MCA. Sequential irradiation and dual aluminium foil monitoring method was employed. Simultaneous multielement analysis was carried out. Namma Coal was studied with radioisotope X-ray Fluorescence (XRF) technique, employing Co-57 exciter source and HP(Ge) detector coupled to ''Canberra'' series 40 MCA. In both FNAA and XRF study, the results obtained were compared to that obtained with Atomic Absorption Spectrophotometry (AAS) technique. Finally, the results were reviewed together with those obtained from similar work on coal with FNAA and XRF techniques. (author)

  2. Analysis of Fuzzy PID and Immune PID Controller for Three Tank Liquid Level Control

    OpenAIRE

    Sharad Kumar Tiwari; Gagandeep Kaur

    2011-01-01

    In industrial control systems the liquid level iscarrying its significance as the control action for level control intanks containing different chemicals or mixtures is essential forfurther control linking set points. The three level control modelsare considered in our work. The conventional control algorithm isdifficult to reach required control quality with more strictrestriction on overshoot. Design a parameter self-tuningPID-controller based on fuzzy control, which can adjustPID-parameter...

  3. HPLC-MS technique for radiopharmaceuticals analysis and quality control

    International Nuclear Information System (INIS)

    Potentialities of liquid chromatography with mass spectrometric detector (MSD) were investigated with the objective of quality control of radiopharmaceuticals; 2-deoxy-2-[18F]fluoro-D-glucose (FDG) being an example. Screening of suitable MSD analytical lines is presented. Mass-spectrometric monitoring of acetonitrile-aqueous ammonium formate eluant by negatively charged FDG.HCO2- ions enables isotope analysis (specific activity) of the radiopharmaceutical at m/z 227 and 226. Kryptofix 222 provides an intense MSD signal of the positive ion associated with NH4+ at m/z 394. Expired FDG injection samples contain decomposition products from which at least one labelled by 18F and characterised by signal of negative ions at m/z 207 does not correspond to FDG fragments but to C5 decomposition products. A glucose chromatographic peak, characterised by m/z 225 negative ion is accompanied by a tail of a component giving a signal of m/z 227, which can belong to [18O]glucose; isobaric sorbitol signals were excluded but FDG-glucose association occurs in the co-elution of separation of model mixtures. The latter can actually lead to a convoluted chromatographic peak, but the absence of 18F makes this inconsistent. Quantification and validation of the FDG component analysis is under way. (author)

  4. Application of Multivariable Statistical Techniques in Plant-wide WWTP Control Strategies Analysis

    DEFF Research Database (Denmark)

    Flores Alsina, Xavier; Comas, J.; Rodríguez-Roda, I.; Jimémez, L.; Gernaey, Krist

    2007-01-01

    The main objective of this paper is to present the application of selected multivariable statistical techniques in plant-wide wastewater treatment plant (WWTP) control strategies analysis. In this study, cluster analysis (CA), principal component analysis/factor analysis (PCA/FA) and discriminant analysis (DA) are applied to the evaluation matrix data set obtained by simulation of several control strategies applied to the plant-wide IWA Benchmark Simulation Model No 2 (BSM2). These techniques al...

  5. Design and Analysis of LINAC Control System in FPGA

    OpenAIRE

    Sangita Shit,; Anil Kumar Sahu

    2012-01-01

    Control system is the key part of Medical linear accelerator (LINAC), as the system deals with controlled radiation exposure to human body. As this sort of system pass through different regulatory body approvals, control system should be able to handle different stringent parameters very precisely. Some of the important tasks for control system are measurement of delivered dose; energy stabilization through controlling voltage level, automatic frequency control (AFC) of magnetron, trigger gen...

  6. PI Controllers in Performance Analysis Computer Code for Nuclear Power Plants

    International Nuclear Information System (INIS)

    There are many proportional integral (PI) controllers used in NSSS control systems for nuclear power plants (NPPs). In order to execute correct performance analysis and to support plant operation effectively for NPPs, computer codes used for performance analysis should have an ability to simulate PI controllers correctly. Therefore, it is important that PI control algorithm is correctly programmed in the computer code to describe PI controllers in hardware with high-fidelity. However, there exist some possibilities that mismatch can occurs for simulation of PI controller according to a method by which the PI controller is converted into numerical expression. In this work, some analyses on this problem are performed and reviewed

  7. Analysis of N-qubit perfectly controlled teleportation schemes from the controller's point of view

    OpenAIRE

    Li, Xi-Han; Ghose, Shohini

    2014-01-01

    We quantitatively analyze and evaluate the controller's power in $N$-qubit controlled teleportation schemes. We calculate the minimum control power required to ensure the controller's authority such that the teleportation fidelity without the controller's permission is no more than the classical bound. We revisit several typical controlled teleportation schemes from the controller's point of view and evaluate the control power in these schemes. We find that for teleporting a...

  8. Design and Analysis of LINAC Control System in FPGA

    Directory of Open Access Journals (Sweden)

    Sangita Shit,

    2012-02-01

    Full Text Available Control system is the key part of Medical linear accelerator (LINAC, as the system deals with controlled radiation exposure to human body. As this sort of system pass through different regulatory body approvals, control system should be able to handle different stringent parameters very precisely. Some of the important tasks for control system are measurement of delivered dose; energy stabilization through controlling voltage level, automatic frequency control (AFC of magnetron, trigger generation, human safety and machine safety interlocks etc. Proposed approach to the above mentioned requirement is design of a control system based on FPGA.This project proposes a control and communication system for medical linear accelerator.

  9. Magnetically controlled accretion onto a black hole

    OpenAIRE

    Ikhsanov, N. R.; Pustil'nik, L. A.; Beskrovnaya, N.G.

    2012-01-01

    An accretion scenario in which the material captured by a black hole from its environment is assumed to be magnetized (\\beta ~ 1) is discussed. We show that the accretion picture in this case is strongly affected by the magnetic field of the flow itself. The accretion power within this Magnetically Controlled Accretion (MCA) scenario is converted predominantly into the magnetic energy of the accretion flow. The rapidly amplified field prevents the accretion flow from forming...

  10. USB apply to field X-ray fluorescence analysis

    International Nuclear Information System (INIS)

    This article analyzes the feasibility of application USB and GPS to field X-ray fluorescence analysis, and focuses on the hardware and firmware design of USB and multi-channel analyzer (MCA), then simply discusses the device driver design and the PC application software design. (authors)

  11. The value of 18F-FDG MCD-SPECT and 99Tcm-ECD SPECT imaging in patients of ischemic cerebrovascular disease with STA-MCA bypass surgery

    International Nuclear Information System (INIS)

    Objective: To evaluate the clinical value of brain glucose metabolism and perfusion imaging in patients with ischemic cerebrovascular disease before and after superficial temporal artery-middle cerebral artery (STA-MCA) bypass surgery. Methods: A comparative study of 18F-fluorodeoxyglucose (FDG) brain metabolism and 99Tcm-ethylcysteinate dimer (ECD) brain perfusion imaging was performed in 5 normal persons and 15 patients with ischemic cerebrovascular disease before and after STA-MCA bypass surgery. Results: The glucose metabolism of ischemic cerebral tissues in 15 patients had three (increased, unchanged or decreasing) forms different with the course of disease before surgery. The ratio of the impaired area to the opposite normal area showed no significant difference (P>0.05) in glucose metabolism before and after STA-MCA bypass surgery. But the patients with high glucose metabolism before surgery improved significantly after surgery. In 99Tcm-ECD imaging, there was decreased perfusion of the affected vessels territory in 15 patients before surgery and it increased after surgery except one unsuccessful case. Except the frontal area, the ratio of the impaired area to the opposite normal area in brain perfusion imaging was significantly different (P<0.01) before and after STA-MCA bypass surgery. Conclusions: The hemodynamic change of the ischemic brain tissue can be better reflected by cerebral blood flow perfusion imaging before and after surgery. Although the change of brain glucose metabolism in ischemic brain tissue is not significant, it plays an important role in observing cerebral function and predicting the effect of surgery. (authors)

  12. Efficacy of 5-FU Combined to Na[trans-RuCl4(DMSO)Im], A Novel Selective Antimetastatic Agent, on the Survival Time of Mice With P388 Leukemia, P388/DDP subline and MCa Mammary Carcinoma

    OpenAIRE

    Coluccia, M; Sava, G.; Salerno, G.; Bergamo, A; Pacor, S.; Mestroni, G.; Alessio, E.

    1995-01-01

    The combinational treatment between the selective antimetastatic agent, sodium-trans-rutheniumtetrachloridedimethylsulfoxideimidazole, Na[trans-RuCl4(DMSO)Im], and the cytotoxic drug 5-fluorouracil (5-FU) on primary tumor growth and on the survival time of experimental tumors results in an effect significantly greater than that of each single agent used alone either with the solid metastasizing MCa mammary carcinoma of the CBA mouse or with the lymphocytic leukemia P388 and its...

  13. Molecular analysis of the genera eremopyrum (ledeb). jaub. and spach and agropyron gaertner (poaceae) by pcr methods

    International Nuclear Information System (INIS)

    RAPD-PCR (Random Amplified Polymorphic DNA Polymerase Chain Reaction) and Post PCR (Polymerase Chain Reaction) Melting Curve Analysis (MCA) have been used to investigate the pattern of genetic variation among some species in the genera Eremopyrum (Ledeb.) Jaub. and Spach and Agropyron Gaertner (Poaceae). Thirteen primers have been used in the study based on the RAPD-PCR and MCA analyses. Each species produced a distinct pattern of DNA fragments which have been used as a measure of the degree of relationship between species by means of using the RAPD-PCR results with three primers selected for identifying the genetic similarities. Polymorphic melting profiles have been obtained with Post PCR MCA method using three primers. Genetic similarities are calculated for all the species studied with RAPD-PCR and MCA methods, the dendrograms are obtained with the MVSP (Multi Variate Statistical Package) software using UPGMA (Unweighted Pair Group Method with Arithmetic Averages) and Jaccard's Coefficient. Polymorphism between 18 populations of Eremopyrum and 6 Agropyron populations and within the species are determined by using RAPD-PCR and Post PCR melting curve analysis (MCA) respectively. (author)

  14. Cost benefit analysis for climate change adaption

    OpenAIRE

    Ierland, E.C., van; Weikard, H.P.; Wesseler, J.H.H.; Groeneveld, R.A.; Ansink, E.J.H.; Bruin, K. de; Rietveld, P.; Bockarjova, M.; Hofkes, M.; Brouwer, R.; Dekker, T

    2012-01-01

    The focus of this programme was on the development of decision making tools based on cost benefit analysis under uncertainty, for analysing adaptation and mitigation options related to spatial planning in the Netherlands. The full programme focused on the methodological issues for cost benefit analysis (CBA) and multi-criteria analysis (MCA) in a spatially explicit and dynamic context, including ancillary benefits and the issue of how to allocate costs to various domains, if ancillary benefit...

  15. Control-flow analysis of function calls and returns by abstract interpretation

    DEFF Research Database (Denmark)

    Midtgaard, Jan; Jensen, Thomas P.

    2009-01-01

    We derive a control-flow analysis that approximates the interprocedural control-flow of both function calls and returns in the presence of first-class functions and tail-call optimization. In addition to an abstract environment, our analysis computes for each expression an abstract control stack, effectively approximating where function calls return across optimized tail calls. The analysis is systematically calculated by abstract interpretation of the stack-based CaEK abstract machine of Flanag...

  16. Analysis of man-machine interaction for control and display system in main control room of light water reactor

    International Nuclear Information System (INIS)

    One of potential hazard in Nuclear Power Plant is the failure of its operation. The accident or operation failure in the reactor must be concerned event its probability is low. The important thing should be concerned is 'Analysis of Man-Machine Interaction (MMI) for Control and Display System in Main Control Room (MCR) of Nuclear Power Reactor', especially LWR type. Control and Display System in MCR of Reactor is the main part of MMI link process in Reactor MCR work system. Signal from display system showed performance process in reactor, while this signal will be received by operator. This signal will be described through central nerve for making decision what kind must be done. Then the operator manage the next process of reactor operation through control system. So by knowing Analysis of Man-Machine Interaction for Control and Display System in Main Control Room of Power Reactor, we can understand human error probability of the operator in reactor operation

  17. Short-term control of the cardiovascular system: modelling and signal analysis

    OpenAIRE

    Monti, Alessandro; Médigue, Claire; Sorine, Michel

    2002-01-01

    Our aim is to relate classical cardiovascular signal analysis to models of the cardiovascular (CV) and control systems taking into account its multiple feedback loop organisation. We discuss knowledges on the short-term control of CV system, focusing on the analysis of CV time-series and control of arterial pressure and RR-interval. In the first and second sections, we introduce modelling concepts which lead us to the definition of a possible decentralised control of CV system, with several b...

  18. Quantitative analysis of distributed control paradigms of robot swarms

    DEFF Research Database (Denmark)

    Ngo, Trung Dung

    2010-01-01

    Given a task of designing controller for mobile robots in swarms, one might wonder which distributed control paradigms should be selected. Until now, paradigms of robot controllers have been within either behaviour based control or neural network based control, which have been recognized as two mainstreams of controller design for mobile robots. However, in swarm robotics, it is not clear how to determine control paradigms. In this paper we study the two control paradigms with various experiments of swarm aggregation. First, we introduce the two control paradigms for mobile robots. Second, we describe the physical and simulated robots, experiment scenario, and experiment setup. Third, we present our robot controllers based on behaviour based and neural network based paradigms. Fourth, we graphically show their experiment results and quantitatively analyse the results in comparison of the two methods. Closing remarks conclude the paper.

  19. Simulation of the treat-upgrade automatic reactor control system

    International Nuclear Information System (INIS)

    This paper describes the design of the Automatic Reactor Control System (ARCS) for the Transient Reactor Test Facility (TREAT) Upgrade. A simulation was used to facilitate the ARCS design, and to completely test and verify its operation before installation at the TREAT facility. The ARCS is a microprocessor network based closed loop control system that provides a position demand control signal to the transient rod hydraulic drive system. There are four identical servo-hydraulic rod drives and each operates as a position control system. The ARCS updates its position demand control signal every 1 msec and its function is to control the transient rods so that the reactor follows a prescribed power-time profile (planned transient). The Main Control Algorithm (MCA) for the ARCS is an optimal reactivity demand algorithm. At each time step, the MCA generates a set of reference reactor functions, e.g., power, period, energy, and delayed neutron power. These functions are compared to plant measurements and estimated values at each time step and are operated on by appropriate algorithms to generate the reactivity demand function. The data necessary to calculate the reference functions is supplied from a Transient Prescription Control Data Set (TPCDS). The TPCDS specifies the planned transient as a fixed number of simply connected independent power profile segments. The developed simulation code models the TREAT reactor kinetics, the hydraulic rod drive system, the plant measurement system, and the ARCS control processor MCA. All of the models operate as continuous systems with the exception of the MCA which operates as a discrete time system at fixed multiples of 1 msec. The study indicates that the ARCS will meet or exceed all of its design specifications

  20. Analysis of Boost Converter Using PI Control Algorithms

    OpenAIRE

    Mitulkumar R. Dave, K.C.Dave

    2012-01-01

    This paper explains about the boost converter and control algorithm to reduce harmonics. For the improvement of the functionality of the boost converter there are many methods available among which I consider PI controller in voltage mode control path. Initially I discussed the basic function of the boost converter. Then I derived the transfer function of the complete system. Then I considered model and simulate into matlab without PI controller. Finally I used PI controller in which the valu...

  1. Pressure Control in Distillation Columns: A Model-Based Analysis

    DEFF Research Database (Denmark)

    Mauricio Iglesias, Miguel; Bisgaard, Thomas; Kristensen, Henrik; Gernaey, Krist; Abildskov, Jens; Huusom, Jakob Kjøbsted

    2014-01-01

    A comprehensive assessment of pressure control in distillation columns is presented, including the consequences for composition control and energy consumption. Two types of representative control structures are modeled, analyzed, and benchmarked. A detailed simulation test, based on a real industrial distillation column, is used to assess the differences between the two control structures and to demonstrate the benefits of pressure control in the operation. In the second part of the article, a t...

  2. Longitudinal studies of binary response data following case-control and stratified case-control sampling: design and analysis

    OpenAIRE

    Schildcrout, Jonathan S.; Rathouz, Paul J.

    2009-01-01

    We discuss design and analysis of longitudinal studies after case-control sampling, wherein interest is in the relationship between a longitudinal binary response that is related to the sampling (case-control) variable, and a set of covariates. We propose a semiparametric modelling framework based on a marginal longitudinal binary response model and an ancillary model for subjects’ case-control status. In this approach, the analyst must posit the population prevalence of being a case, which i...

  3. High Performance Flow Analysis and Control Tools for Aerial Vehicles Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The objective of the project is to develop an open architecture, computer aided analysis and control design toolbox for distributed parameter systems, in...

  4. Bifurcation Tools for Flight Dynamics Analysis and Control System Design Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Modern bifurcation analysis methods have been proposed for investigating flight dynamics and control system design in highly nonlinear regimes and also for the...

  5. Control of interferences in the analysis of low-concentration I 129

    International Nuclear Information System (INIS)

    Traces of uranium, cesium and tellurium interfere in the determination of I 129 by neutron activation analysis. The paper describes the procedures used to control or eliminate the interferences in the different steps of the analysis

  6. Azimuthal neutron field variation analysis utilizing BN-600 control rod efficiency measurement data

    International Nuclear Information System (INIS)

    The method for analysis of neutron flux density azimuthal distribution heterogeneity in the BN-600 reactor core basing on the measured control rod worths is suggested. The method applicability for irregular situation analysis is proved. 7 refs., 1 tab

  7. Collaborative human-machine analysis using a controlled natural language

    Science.gov (United States)

    Mott, David H.; Shemanski, Donald R.; Giammanco, Cheryl; Braines, Dave

    2015-05-01

    A key aspect of an analyst's task in providing relevant information from data is the reasoning about the implications of that data, in order to build a picture of the real world situation. This requires human cognition, based upon domain knowledge about individuals, events and environmental conditions. For a computer system to collaborate with an analyst, it must be capable of following a similar reasoning process to that of the analyst. We describe ITA Controlled English (CE), a subset of English to represent analyst's domain knowledge and reasoning, in a form that it is understandable by both analyst and machine. CE can be used to express domain rules, background data, assumptions and inferred conclusions, thus supporting human-machine interaction. A CE reasoning and modeling system can perform inferences from the data and provide the user with conclusions together with their rationale. We present a logical problem called the "Analysis Game", used for training analysts, which presents "analytic pitfalls" inherent in many problems. We explore an iterative approach to its representation in CE, where a person can develop an understanding of the problem solution by incremental construction of relevant concepts and rules. We discuss how such interactions might occur, and propose that such techniques could lead to better collaborative tools to assist the analyst and avoid the "pitfalls".

  8. Fuzzy Current-Mode Control and Stability Analysis

    Science.gov (United States)

    Kopasakis, George

    2000-01-01

    In this paper a current-mode control (CMC) methodology is developed for a buck converter by using a fuzzy logic controller. Conventional CMC methodologies are based on lead-lag compensation with voltage and inductor current feedback. In this paper the converter lead-lag compensation will be substituted with a fuzzy controller. A small-signal model of the fuzzy controller will also be developed in order to examine the stability properties of this buck converter control system. The paper develops an analytical approach, introducing fuzzy control into the area of CMC.

  9. Analysis of water level control methods for nuclear steam generator

    International Nuclear Information System (INIS)

    Nuclear steam generator (SG) is a highly complex nonlinear time-changed system. The inverse dynamics effects, which are caused by shrink and swell under transient, startup and lower power operation, make the water level difficult to control. Methods of SG water level control are analyzed. The shortcoming of conventional PI(D) control for SG level is pointed out. It emphatically expounds the fuzzy logic control and the neural network control to nuclear steam generator level. Finally, the author brings forward his opinion upon the advance tendency of SG water level control. (authors)

  10. Modeling and Analysis of PI Controller Based Speed Control of Brushless DC Motor Drive.

    OpenAIRE

    Mr.P.Nagasekhar Reddy

    2013-01-01

    The Brushless DC motors (BLDC) find widespread applications in domestic and industries due to their low and high power density and ease of speed control. To accomplish desired level of performance the motor requires suitable speed controllers. In case of permanent magnet Brushless DC motors, usually control of speed is reached by using proportional integral (PI) controller. Although the conventional PI controllers are widely used in the industry due to their simple control structure and ease ...

  11. Next Generation Nuclear Plant Resilient Control System Functional Analysis

    International Nuclear Information System (INIS)

    Control Systems and their associated instrumentation must meet reliability, availability, maintainability, and resiliency criteria in order for high temperature gas-cooled reactors (HTGRs) to be economically competitive. Research, perhaps requiring several years, may be needed to develop control systems to support plant availability and resiliency. This report functionally analyzes the gaps between traditional and resilient control systems as applicable to HTGRs, which includes the Next Generation Nuclear Plant; defines resilient controls; assesses the current state of both traditional and resilient control systems; and documents the functional gaps existing between these two controls approaches as applicable to HTGRs. This report supports the development of an overall strategy for applying resilient controls to HTGRs by showing that control systems with adequate levels of resilience perform at higher levels, respond more quickly to disturbances, increase operational efficiency, and increase public protection.

  12. Analysis and design of controllers for a double inverted pendulum

    DEFF Research Database (Denmark)

    Niemann, Hans Henrik; Poulsen, J K

    2003-01-01

    A physical control problem is studied with the ? methodology. The issues of modelling, uncertainty modelling, performance specification, controller design and laboratory implementation are discussed. The laboratory experiment is a double inverted pendulum placed on a cart. The limitations in the system with respect to performance are the limitation in the control signal and the limitation of the movement of the chart. It is shown how these performance limitation will effect the design of a ? controller for the system.

  13. Mathemetical performance analysis of a temperature controlled bulk storage room

    OpenAIRE

    Mourik, S. van; Ploegaert, J.P.M.; Zwart, H.; Keesman, K.J.

    2007-01-01

    Usually, control design takes place after the plant has been designed. However, the performance of the plant connected to the controller might be improved by simultaneous design of the plant and the controller. In this paper, expressions are deduced that describe the dynamics of a controlled plant (a bulk storage room) and its design criteria. These expressions contain all the physical system parameters, and give insight on how the system performance (in terms of energy usage and temperature ...

  14. Small-angle stability analysis of a linear control system for a high power communication satellite

    Science.gov (United States)

    Omalley, T. A.

    1972-01-01

    A small angle stability analysis is presented for one particular configuration of a high power communication satellite having a linear control system. Both the central body and the solar array are treated as rigid bodies. The control system studied consists of three-axis control of the central body and one-axis control of the solar array rotation relative to the central body. The results yield preliminary indications of the relation of stability to satellite inertias and control gains.

  15. Application of Multivariable Statistical Techniques in Plant-wide WWTP Control Strategies Analysis

    DEFF Research Database (Denmark)

    Flores Alsina, Xavier; Comas, J.

    2007-01-01

    The main objective of this paper is to present the application of selected multivariable statistical techniques in plant-wide wastewater treatment plant (WWTP) control strategies analysis. In this study, cluster analysis (CA), principal component analysis/factor analysis (PCA/FA) and discriminant analysis (DA) are applied to the evaluation matrix data set obtained by simulation of several control strategies applied to the plant-wide IWA Benchmark Simulation Model No 2 (BSM2). These techniques allow i) to determine natural groups or clusters of control strategies with a similar behaviour, ii) to find and interpret hidden, complex and casual relation features in the data set and iii) to identify important discriminant variables within the groups found by the cluster analysis. This study illustrates the usefulness of multivariable statistical techniques for both analysis and interpretation of the complex multicriteria data sets and allows an improved use of information for effective evaluation of control strategies.

  16. Analysis and Control of Flora in Cream Vegetarian Salad

    Directory of Open Access Journals (Sweden)

    Yang Yuan

    2014-02-01

    Full Text Available A survey of microbial pollution and health quality change was conducted during the process of the production and refrigeration of Cream Vegetarian Salad food, to provide a basic reference for the catering industry to carry out HACCP management system for food like this and ensure the safety of food. Then a basic formula of Cream Vegetarian Salad was made according to the literature, further the total number of bacteria, pseudomonas, lactic acid bacteria, enterobacter, cocci and microzyme was tested in the main raw material and finished product detection according to the national standard method, Without changing the taste of the finished production, the raw materials were blanched, to measure the reduced bacteria rate, and determine the improved formula; the salad was stored at 4°C, then the number of bacteria was counted according to the time sequence and flora analysis was made to draw up the date of minimum durability. The total bacterial count of the Cream Vegetarian Salad by the basic formula is 2.3×104 CFU/g, among which coriander occupies 87%, sweetbell 7%, the rest is of small scale. Thus, the Cream Vegetarian Salad made in kitchen can be seriously polluted by microbial, mainly due to parsley, sweetbell red pepper and other raw materials, through the method of sterilization, storage in low temperature secondary pollution can be avoided, and the bacterial count can be controlled effectively, then the shelf life was extended and the risk of food poisoning was reduced, which did a lot of benefit to the food safety management of the catering industry.

  17. Analysis and Control of Bulgaria Onion Cold Soup

    Directory of Open Access Journals (Sweden)

    Yunsheng Jiang

    2014-02-01

    Full Text Available A survey of microbial pollution and health quality change was conducted during the process of the production and refrigeration of Onion Cold Soup to provide a basic reference for the catering industry for the implementation of HACCP management system for food and to ensure the safety of food. A basic formula of Onion Cold Soup was made according to the literature, then the total number of bacteria, pseudomonas, lactic acid bacteria, enterobacter, cocci and microzyme were tested in the main raw material and finished product detection according to the national standard method; hot boiling water to wash the main raw materials, statistical reduction in strain rate, in order to determine improvement formula. The finished cold soup at 4°C refrigerator made flora analysis, and drew up the date of minimum durability. The total bacterial count of the Onion Cold Soup by the basic formula is 2.4?104cfu/g, among which coriander occupied 53%, egg 24%, onion and lemonade 17% and 6%; respectively; and after blanching, the total number of colonies in the improved formulation is 1.1?103, the sterilization rate reaches 95.4%, and the effect is slightly obvious. The Onion Cold Soup made in kitchen can be seriously polluted by microbial, hot boiling water to wash the main raw materials and avoid secondary pollution, thus the bacterial count can be controlled effectively, then the shelf life was extended and the risk of food poisoning was reduced, which did a lot of benefit to the catering industry the food safety management.

  18. Screening of conditions controlling spectrophotometric sequential injection analysis

    Directory of Open Access Journals (Sweden)

    Idris Abubakr M

    2011-02-01

    Full Text Available Abstract Background Despite its potential benefits over univariate, chemometrics is rarely utilized for optimizing sequential injection analysis (SIA methods. Specifically, in previous vis-spectrophotometric SIA methods, chemometrically optimized conditions were confined within flow rate and reagent concentrations while other conditions were ignored. Results The current manuscript reports, for the first time, a comprehensive screening of conditions controlling vis-spectrophotometric SIA. A new diclofenac assay method was adopted. The method was based on oxidizing diclofenac by permanganate (a major reagent with sulfuric acid (a minor reagent. The reaction produced a spectrophotometrically detectable diclofenac form. The 26 full-factorial design was utilized to study the effect of volumes of reagents and sample, in addition to flow rate and concentrations of reagents. The main effects and all interaction order effects on method performance, i.e. namely sensitivity, rapidity and reagent consumption, were determined. The method was validated and applied to pharmaceutical formulations (tablets, injection and gel. Conclusions Despite 64 experiments those conducted in the current study were cumbersome, the results obtained would reduce effort and time when developing similar SIA methods in the future. It is recommended to critically optimize effective and interacting conditions using other such optimization tools as fractional-factorial design, response surface and simplex, rather than full-factorial design that used at an initial optimization stage. In vis-spectrophotometric SIA methods those involve developing reactions with two reagents (major and minor, conditions affecting method performance are in the following order: sample volume > flow rate ? major reagent concentration >> major reagent volume ? minor reagent concentration >> minor reagent volume.

  19. A stability analysis method for the fuzzy controller and its application

    International Nuclear Information System (INIS)

    A method is proposed to analyze the stability of a fuzzy controller and the method is applied to a fuzzy controller developed in this work to automatically control the steam generator water level in the pressurized water reactor (PWR). The stability analysis method is devised from the relationships between the fuzzy controller and the conventional PI (Proportional and Integral) controller. The relationships are derived from the theoretical analysis and modeling of the widely used fuzzy controller having two inputs (Error, Rate) and one output with triangular type membership functions. In addition, an analyzable 9-Rule fuzzy controller is designed and computer-simulated for the automatic control of the steam generator water level in the PWR to employ the developed stability analysis method. This study shows that the stability analysis method based on the comparison of the equivalent PI gain ranges of the fuzzy controller with that of a linear PI controller provides very meaningful ideas for the design of stable fuzzy controller through the computer simulations. Therefore, the method suggested in this work can be used in a confirmatory process to check the stability of a fuzzy controller designed with two inputs (error, rate) and also the method would be used as an useful guidance to efficiently design and tune the fuzzy controller

  20. Accident analysis and control options in support of the sludge water system safety analysis

    International Nuclear Information System (INIS)

    A hazards analysis was initiated for the SWS in July 2001 (SNF-8626, K Basin Sludge and Water System Preliminary Hazard Analysis) and updated in December 2001 (SNF-10020 Rev. 0, Hazard Evaluation for KE Sludge and Water System - Project A16) based on conceptual design information for the Sludge Retrieval System (SRS) and 60% design information for the cask and container. SNF-10020 was again revised in September 2002 to incorporate new hazards identified FR-om final design information and FR-om a What-if/Checklist evaluation of operational steps. The process hazards, controls, and qualitative consequence and FR-equency estimates taken FR-om these efforts have been incorporated into Revision 5 of HNF-3960, K Basins Hazards Analysis. The hazards identification process documented in the above referenced reports utilized standard industrial safety techniques (AIChE 1992, Guidelines for Hazard Evaluation Procedures) to systematically guide several interdisciplinary teams through the system using a pre-established set of process parameters (e.g., flow, temperature, pressure) and guide words (e.g., high, low, more, less). The teams generally included representation FR-om the U.S. Department of Energy (DOE), K Basins Nuclear Safety, T Plant Nuclear Safety, K Basin Industrial Safety, fire protection, project engineering, operations, and facility engineering

  1. Comprehensive Analysis of the Control Strategy for Hybrid Active Power Filter with Injection Circuit

    OpenAIRE

    MinhThuyen Chau, VanBao Chau

    2013-01-01

    This paper proposes an overview of the analysis of control strategies for Hybrid Active Power Filter with Injection Circuit (IHAPF). This analysis will be the basis of researches of the IHAPF in the future. Simulation results have shown the effectiveness of the control strategies.

  2. Comprehensive Analysis of the Control Strategy for Hybrid Active Power Filter with Injection Circuit

    Directory of Open Access Journals (Sweden)

    MinhThuyen Chau, VanBao Chau

    2013-07-01

    Full Text Available This paper proposes an overview of the analysis of control strategies for Hybrid Active Power Filter with Injection Circuit (IHAPF. This analysis will be the basis of researches of the IHAPF in the future. Simulation results have shown the effectiveness of the control strategies.

  3. Off-line data analysis and data reduction from digitally controlled random test systems.

    Science.gov (United States)

    Chapman, C. P.; Sotomayor, B. R.

    1972-01-01

    This paper discusses the merits of employing the new computer-controlled random environment control systems for fast and efficient large-scale data analysis when they are not being used for test control. Hardware and software requirements are stated. Several of the more familiar frequency functions are defined from the Fourier coefficients, the main product of the Fourier processors used in these control systems. Another function, the probability density function, is defined and suggestions for its application are made. An analysis example is presented. Some programming tips are listed, and the accuracy and reliability of frequency analysis measurements are considered.

  4. Probabilistic Analysis of Reactive Power Control Strategies for Wind Farms

    OpenAIRE

    Hethey, János; Leweson, Sofie

    2009-01-01

    The increasing wind power penetration in electrical power systems across Europe has led to rising grid code requirements concerning reactive power control by wind farms in order to meet the upcoming challenges for system stability, control and operation. Some of the important factors for the reactive power control strategy are the stochastic variations of wind and grid voltage which affect both the reactive power capabilities of wind farms and the reactive power support demanded by the grid c...

  5. Architectures and Performance Analysis of Wireless Control Systems

    OpenAIRE

    Demirel, Burak

    2015-01-01

    Modern industrial control systems use a multitude of spatially distributed sensors and actuators to continuously monitor and control physical processes. Information exchange among control system components is traditionally done through physical wires. The need to physically wire sensors and actuators limits flexibility, scalability and reliability, since the cabling cost is high, cable connectors are prone to wear and tear, and connector failures can be hard to isolate. By replacing some of t...

  6. Analysis and design of controllers for a double inverted pendulum

    DEFF Research Database (Denmark)

    Niemann, Hans Henrik; Poulsen, J K

    2003-01-01

    A physical control problem is studied with the ? methodology. The issues of modelling, uncertainty modelling, performance specification, controller design and laboratory implementation are discussed. The laboratory experiment is a double inverted pendulum placed on a cart. The limitations in the system with respect to performance are the limitation in the control signal and the limitation of the movement of the chart. It is shown how these performance limitation will effect the design of a ? con...

  7. Design and Analysis of Controllers for an Double Inverted Pendulum

    DEFF Research Database (Denmark)

    Niemann, Hans Henrik; Poulsen, Jesper Kildegaard

    2005-01-01

    A physical control problem is studied with the H_inf and the SSV methodology. The issues of modelling, uncertainty modelling, performance specification, controller design and laboratory implementation are discussed. The laboratory experiment is a double inverted pendulum placed on a cart. The limitations in the system with respect to performance are the limitation in the control signal and the limitation of the movement of the cart. It is shown how these performance limitations will effect the d...

  8. Analysis and design of controllers for a double inverted pendulum

    OpenAIRE

    Niemann, Hans Henrik; Poulsen, J.K.

    2010-01-01

    A physical control problem is studied with the ? methodology. The issues of modelling, uncertainty modelling, performance specification, controller design and laboratory implementation are discussed. The laboratory experiment is a double inverted pendulum placed on a cart. The limitations in the system with respect to performance are the limitation in the control signal and the limitation of the movement of the chart. It is shown how these performance limitation will effect the design of a ? ...

  9. Analysis of achievable disturbance attenuation in a precision magnetically-suspended motion control system

    Science.gov (United States)

    Kuzin, Alexander V.; Holmes, Michael L.; Behrouzjou, Roxana; Trumper, David L.

    1994-01-01

    The results of the analysis of the achievable disturbance attenuation to get an Angstrom motion control resolution and macroscopic travel in a precision magnetically-suspended motion control system are presented in this paper. Noise sources in the transducers, electronics, and mechanical vibrations are used to develop the control design.

  10. Analysis of Stability, Response and LQR Controller Design of a Small Scale Helicopter Dynamics

    CERN Document Server

    Dharmayanda, Hardian Reza; Lee, Young Jae; Sung, Sangkyung

    2008-01-01

    This paper presents how to use feedback controller with helicopter dynamics state space model. A simplified analysis is presented for controller design using LQR of small scale helicopters for axial and forward flights. Our approach is simple and gives the basic understanding about how to develop controller for solving the stability of linear helicopter flight dynamics.

  11. Analysis of Nonlinear Speed-Torque Performance of SRM with Fuzzy Based Nonlinear Controller

    OpenAIRE

    BASANT KUMAR NAYAK; CH. RAVI KUMAR

    2013-01-01

    By the use of linear controller the analysis of performance of SRM is not sufficient because of stator inductance of stator winding of SRM is function of rotor position, so here proposed to be design the nonlinear controller i.e. fuzzy based controller which converge the comparison analysis of SRM based on speed error and its change with respect time domain specification. Neural network and fuzzy logic technique are unique technique in which process the information specify by mathematical equ...

  12. Design and Analysis of Controllers for an Double Inverted Pendulum

    DEFF Research Database (Denmark)

    Niemann, Hans Henrik; Poulsen, Jesper Kildegaard

    2005-01-01

    A physical control problem is studied with the H_inf and the SSV methodology. The issues of modelling, uncertainty modelling, performance specification, controller design and laboratory implementation are discussed. The laboratory experiment is a double inverted pendulum placed on a cart. The limitations in the system with respect to performance are the limitation in the control signal and the limitation of the movement of the cart. It is shown how these performance limitations will effect the design of H_inf and SSV controllers for the system.

  13. Reliability analysis of digital instrumentation and control systems

    International Nuclear Information System (INIS)

    The NUREG-CR/6942 technical report proposed a Markov state transition model for the main feedwater valve (MFV) controller system as part of a Probabilistic Risk Assessment (PRA) of Digital Feedwater Control System (DFWCS). The proposed model extends the Markov model to allow the use of non-exponential distribution in the time to next output of the controller system responsible for maintaining the water level. This case study demonstrates the general application of semi-Markov process model for digital instrumentation and control systems. System failure probability and mission reliability measures are determined. (author)

  14. Simulation Based Analysis of Two Different Control Strategies for PMSM

    Directory of Open Access Journals (Sweden)

    Lindita Dhamo#1 , Aida Spahiu

    2013-04-01

    Full Text Available In low power application generally permanent magnet synchronous motor (PMSM are used. Because of their high performance/cost ratio, the attention toward PMSM in variable speed application, is greater. Control of torque, rotation speed and position for four quadrants and low speed operation, with high-performance dynamic behaviour, are often required in industrial applications but they are sensitive from the standpoint of the control strategies reliability. Vector control based on fieldoriented control (FOC is one of the methods most investigated and discussed by many researcher and now it is an industry standard. Traditional control methods based on FOC use position sensors result to be very expensive in electrical drive with low power. The aim of this paper is to show that sensorless control strategy based on MRAS approach can be applied successfully in PMSM drives with low cost. The results are obtained from comparison of two algorithms of vector control of PMSM: traditional FOC using position sensor and model reference adaptive system (MRAS approach based on sensorless vector control .Based on results obtained, advantages and disadvantages of the proposed control structures will be discussed.

  15. Adaptive control of a refrigeration system. Feasibility analysis and controller design

    Energy Technology Data Exchange (ETDEWEB)

    Zhou Jian-jun

    1990-02-01

    The aim was to develope adaptive control of a refrigeration system for industrial purposes. The proposed control scheme and controller design methods are described. The STAC (Self-Tuning Adaptive Control) method is principally utilized. This is a design procedure where known system parameters are first chosen and then applied to the unknown system in which the unknown parameters are estimated by an online identification method. The refrigeration system and the control objective are described in addition to the basic principles of adaptive control. Commonly used online identification logarithms and the underlying controller design methods are presented. It is concluded that adaptive control techniques are suitable for the refrigeration system in which plant parameters change with time and are not well known. Some suggestions for improving the method are offered. (AB) (30 refs.).

  16. Analysis of Operational and Management Cybersecurity Controls for Nuclear Facilities

    Energy Technology Data Exchange (ETDEWEB)

    Oh, Jin Seok; Ryou, Jae Cheol [Chungnam National University, Dajeon (Korea, Republic of)

    2014-08-15

    U.S. NRC developed this RG 5.71 by tailoring the baseline security controls described in NIST Special Publication 800-53 'Recommended Security Controls for Federal Information Systems and Organizations' to provide an acceptable method to comply with the 10 CFR 73.54. The purpose of this publication is to provide guidelines for selecting and specifying security controls for information systems. In this paper, we are going to analyze and compare the NRC RG 5.71 and the NIST SP800-53, in particular, for operational security controls and management security controls. If RG 5.71 omits the specific security control that is included in SP800-53, we would review that omitting is adequate or not. If RG 5.71 includes the specific security control that is not included in SP800-53, we would also review the rationale. And we are going to consider some security controls to strengthen cybersecurity of nuclear facilities.

  17. Analysis of Operational and Management Cybersecurity Controls for Nuclear Facilities

    International Nuclear Information System (INIS)

    U.S. NRC developed this RG 5.71 by tailoring the baseline security controls described in NIST Special Publication 800-53 'Recommended Security Controls for Federal Information Systems and Organizations' to provide an acceptable method to comply with the 10 CFR 73.54. The purpose of this publication is to provide guidelines for selecting and specifying security controls for information systems. In this paper, we are going to analyze and compare the NRC RG 5.71 and the NIST SP800-53, in particular, for operational security controls and management security controls. If RG 5.71 omits the specific security control that is included in SP800-53, we would review that omitting is adequate or not. If RG 5.71 includes the specific security control that is not included in SP800-53, we would also review the rationale. And we are going to consider some security controls to strengthen cybersecurity of nuclear facilities

  18. Sequential design of decentralized load frequency controllers using ? synthesis and analysis

    International Nuclear Information System (INIS)

    A new systematic approach to design of sequential decentralized load frequency controllers for multi-area power systems based on ? synthesis and analysis is described. System uncertainties, practical constraints on control action and desired performance are included in the synthesis procedure. The robust performance in terms of the structured singular value is used as a measure of control performance. A four area power system example is presented, demonstrating the controllers' synthesis procedure and advantages of the proposed strategy

  19. Comparative Analysis of Control Techniques for Efficiency Improvement in Electric Vehicles

    OpenAIRE

    Haddoun, Abdelhakim; Benbouzid, Mohamed; DIALLO, Demba; Abdessemed, Rachid; Ghouili, Jamel; Kamel SRAIRI

    2007-01-01

    This paper presents system analysis, modeling and simulation of an Electric Vehicle (EV) with three different control strategies: Field Oriented Control (FOC), Direct Torque Control (DTC), and DTC using Space Vector Modulation (DTCSVM). The objective is to assess the control strategy impact on the EV efficiency taking into account the vehicle dynamics. Indeed, among EV motor electric propulsion features, the energy efficiency is a basic characteristic that is influenced by vehicle dynamics an...

  20. Jitterbug and TrueTime: Analysis Tools for Real-Time Control Systems

    OpenAIRE

    Cervin, Anton; Henriksson, Dan; Lincoln, Bo; Årzén, Karl-Erik

    2002-01-01

    The paper presents two recently developed, Matlab-based analysis tools for realtime control systems. The first tool, called Jitterbug, is used to compute a performance criterion for a control loop under various timing conditions. The tool makes it easy to quickly judge how sensitive a controller is to implementation effects such as slow sampling, delays, jitter, etc. The second tool, called TrueTime, allows detailed co-simulation of process dynamics, control task execution, and network commun...

  1. DESCRIBING FUNCTION METHOD FOR PI-FUZZY CONTROLLED SYSTEMS STABILITY ANALYSIS

    OpenAIRE

    Stefan PREITL; Radu-Emil PRECUP

    2004-01-01

    The paper proposes a global stability analysis method dedicated to fuzzy control systems containing Mamdani PI-fuzzy controllers with output integration to control SISO linear / linearized plants. The method is expressed in terms of relatively simple steps, and it is based on: the generalization of the describing function method for the considered fuzzy control systems to the MIMO case, the approximation of the describing functions by applying the least squares method. The method is applied t...

  2. Analysis of Linear L1 Adaptive Control Architectures for Aerospace Applications

    OpenAIRE

    Pettersson, Anders; Åström, Karl Johan; Robertsson, Anders; Johansson, Rolf

    2012-01-01

    In some situations the closed-loop system obtained by L1 adaptive control is equivalent to linear systems. The architectures of these systems are investigated and compared with internal model control and the input observer architecture. The analysis is focused on aerospace application. An effort has been made to understand and describe what fundamental control characteristic of flying applications that make L1 adaptive controllers suitable for the task.

  3. Analysis of Information Quality in event triggered Smart Grid Control

    DEFF Research Database (Denmark)

    Kristensen, Thomas le Fevre; Olsen, Rasmus LØvenstein

    2015-01-01

    The integration of renewable energy sources into the power grid requires added control intelligence which imposes new communication requirements onto the future power grid. Since large scale implementation of new communication infrastructure is infeasible, we consider methods of increasing dependability of existing networks. We develop models for network delays and information dynamics, and uses these to model information quality for three given information access schemes in an event triggered control scenario. We analyse the impact of model parameters, and show how optimal choice of information access scheme depends on network conditions as well as trade-offs between information quality, network resources and control reactivity.

  4. Research for quality control in the SEM/SIMS analysis of uranium-containing particles

    International Nuclear Information System (INIS)

    Based on the quality-control methods applied to the analysis of uranium-containing particles by SIMS in IAEA nuclear safeguards analytical laboratory and combined with the practical conditions of laboratory, the quality-control methods for the SEM/SIMS analysis have been explored primarily. It is showed that cross-contamination is essential in the SEM/SIMS analysis. Fume hood is the critical area of the introduction of cross-contamination during the process of sample preparation and handling. The chamber of SEM is the key area of the introduction of cross-contamination in the process of analysis. The list of contamination and the corresponding measures have been established. In the research of quality-control samples, the room blanks, process blank, standard samples and blind samples were analyzed. The initial quality-control methods for the SEM/SIMS analysis have been built up. It is demonstrated that the study of quality control is effective through the analysis of swipe samples. An important progress has been made in contamination control and analysis control, which provides the support for the establishment of a sound quality-assurance system in our laboratory. (authors)

  5. Automatic analysis of signals during Eddy currents controls

    International Nuclear Information System (INIS)

    A method and the corresponding instrument have been developed for automatic analysis of Eddy currents testing signals. This apparatus enables at the same time the analysis, every 2 milliseconds, of two signals at two different frequencies. It can be used either on line with an Eddy Current testing instrument or with a magnetic tape recorder

  6. Nuclear power plant control room task analysis. Pilot study for pressurized water reactors

    International Nuclear Information System (INIS)

    The purposes of this nuclear plant task analysis pilot study: to demonstrate the use of task analysis techniques on selected abnormal or emergency operation events in a nuclear power plant; to evaluate the use of simulator data obtained from an automated Performance Measurement System to supplement and validate data obtained by traditional task analysis methods; and to demonstrate sample applications of task analysis data to address questions pertinent to nuclear power plant operational safety: control room layout, staffing and training requirements, operating procedures, interpersonal communications, and job performance aids. Five data sources were investigated to provide information for a task analysis. These sources were (1) written operating procedures (event-based); (2) interviews with subject matter experts (the control room operators); (3) videotapes of the control room operators (senior reactor operators and reactor operators) while responding to each event in a simulator; (4) walk-/talk-throughs conducted by control room operators for each event; and (5) simulator data from the PMS

  7. Representational Similarity Analysis Reveals Heterogeneous Networks Supporting Speech Motor Control

    DEFF Research Database (Denmark)

    Zheng, Zane; Cusack, Rhodri

    The everyday act of speaking involves the complex processes of speech motor control. One important feature of such control is regulation of articulation when auditory concomitants of speech do not correspond to the intended motor gesture. While theoretical accounts of speech monitoring posit multiple functional components required for detection of errors in speech planning (e.g., Levelt, 1983), neuroimaging studies generally indicate either single brain regions sensitive to speech production errors, or small, discrete networks. Here we demonstrate that the complex system controlling speech is supported by a complex neural network that is involved in linguistic, motoric and sensory processing. With the aid of novel real-time acoustic analyses and representational similarity analyses of fMRI signals, our data show functionally differentiated networks underlying auditory feedback control of speech.

  8. Game Analysis of Internal Control and Risk Management

    OpenAIRE

    Yanhong Pang; Qing. Li

    2013-01-01

    Based on examining links and differences between internal control and risk management from their definition,this paper mainly analyzes their relation with game theory. A complete information static game model isestablished and payoff functions for managers and investors are designed. The result shows that the decrease ofbusiness risk cannot be realized by severe penalties, instead, the frequency of internal control in risk monitoringmust be taken into consideration, and otherwise it will stim...

  9. Customization and management control: An analysis of franchise contracts

    OpenAIRE

    Verbieren, Sofie; Cools, Martine; Van den Abbeele, Alexandra

    2013-01-01

    The aim of this paper is to investigate how service customization impacts on the way in which franchisors control the relationship with their franchised service units. We particularly investigate variation in franchise contract design in terms of the delegation of decision rights, monitoring, incentives and input control in chains offering services with varying levels of customization. We code and analyze a unique sample of 81 contracts of chains from different service industries. The results...

  10. Decentralized Control of Cooperative Systems: Categorization and Complexity Analysis

    OpenAIRE

    Goldman, C. V.; Zilberstein, S.

    2011-01-01

    Decentralized control of cooperative systems captures the operation of a group of decision makers that share a single global objective. The difficulty in solving optimally such problems arises when the agents lack full observability of the global state of the system when they operate. The general problem has been shown to be NEXP-complete. In this paper, we identify classes of decentralized control problems whose complexity ranges between NEXP and P. In particular, we study ...

  11. Extracting Chaos Control Parameters from Time Series Analysis

    International Nuclear Information System (INIS)

    We present a simple method to analyze time series, and estimate the parameters needed to control chaos in dynamical systems. Application of the method to a system described by the logistic map is also shown. Analyzing only two 100-point time series, we achieved results within 2% of the analytical ones. With these estimates, we show that OGY control method successfully stabilized a period-1 unstable periodic orbit embedded in the chaotic attractor.

  12. Stock replenishment analysis and optimization for dynamic fluid control

    OpenAIRE

    Botes, F.H.

    2011-01-01

    Dynamic Fluid Control has identified the need of a Dynamic Safety Stock mechanism and optimal Economic Order Quantities. The current Static Safety Stock Policy used by the organization results in costs that can be avoided and customer dissatisfaction because of fluctuations in demand during the year. The objective of this project is to supply Dynamic Fluid Control with dynamic safety stock level recommendations as well as optimal order quantities through a Dynamic Safety Stock model. The obje...

  13. Economic Analysis of the Birth-Control Law in China

    OpenAIRE

    Chenhao Zhu

    2009-01-01

    This paper explores the two approaches of governments’ population policy: command-and-control regulation and market-oriented incentive. From both the micro and macro perspective, this paper draws a conclusion that the population market has its own autonomous principles and too much government intervention like the birth-control law in China is harmful. Policy-makers should provide guarantee from the political regime. And in case of market failure, the government should adopt the market-orient...

  14. A viability analysis of fishery controlled by investment rate.

    Science.gov (United States)

    Sanogo, C; Raïssi, N; Ben Miled, S; Jerry, C

    2013-09-01

    This work presents a stock/effort model describing both harvested fish population and fishing effort dynamics. The fishing effort dynamic is controlled by investment which corresponds to the revenue proportion generated by the activity. The dynamics are subject to a set of economic and biological state constraints. The analytical study focuses on the compatibility between state constraints and controlled dynamics. By using the mathematical concept of viability kernel, we reveal situations and management options that guarantee a sustainable system. PMID:24002567

  15. Analysis of Series Resonant Inverter using Hysteresis Current Control

    OpenAIRE

    Nithya, R; Ms.N.P.Anila; Mohan, J.

    2014-01-01

    The main objective of this paper is to analyze a series resonant inverter for industrial induction heating application. It is a process used for heat conductive materials, bond, harden, and soften metals. Resonant inverters which operate at high frequency preferable for induction heating. Series resonant inverters which is made up of Insulated Gate Bipolar Transistor (IGBT). Power control is obtained by Hysteresis Current Control (HCC). Soft switching techniques is performed which minimizes s...

  16. Optimal discrimination of multiple quantum systems: controllability analysis

    International Nuclear Information System (INIS)

    A theoretical study is presented concerning the ability to dynamically discriminate between members of a set of different (but possibly similar) quantum systems. This discrimination is analysed in terms of independently and simultaneously steering about the wavefunction of each component system to a target state of interest using a tailored control (i.e. laser) field. Controllability criteria are revealed and their applicability is demonstrated in simple cases. Discussion is also presented in some uncontrollable cases

  17. Purpose-based access control policies and conflicting analysis

    OpenAIRE

    Wang, Hua; Sun, Lili; Varadharajan, Vijay

    2010-01-01

    This paper proposes a purpose-based framework for supporting privacy preserving access control policies and mechanisms. The mechanism enforces access policy to data containing personally identifiable information. The key component of the framework is purpose involved access control models (PAC) that provide full support for expressing highly complex privacy-related policies, taking into account features like purposes and conditions. A policy refers to an access right that a subject can have o...

  18. Analysis of Series Resonant Inverter using Hysteresis Current Control

    Directory of Open Access Journals (Sweden)

    R.Nithya

    2014-02-01

    Full Text Available The main objective of this paper is to analyze a series resonant inverter for industrial induction heating application. It is a process used for heat conductive materials, bond, harden, and soften metals. Resonant inverters which operate at high frequency preferable for induction heating. Series resonant inverters which is made up of Insulated Gate Bipolar Transistor (IGBT. Power control is obtained by Hysteresis Current Control (HCC. Soft switching techniques is performed which minimizes switching losses.

  19. Representational Similarity Analysis Reveals Heterogeneous Networks Supporting Speech Motor Control

    DEFF Research Database (Denmark)

    Zheng, Zane; Cusack, Rhodri; Johnsrude, Ingrid; MacDonald, Ewen; Munhall, Kevin; Vicente-Grabovetsky, Alejandro

    2012-01-01

    The everyday act of speaking involves the complex processes of speech motor control. One important feature of such control is regulation of articulation when auditory concomitants of speech do not correspond to the intended motor gesture. While theoretical accounts of speech monitoring posit multiple functional components required for detection of errors in speech planning (e.g., Levelt, 1983), neuroimaging studies generally indicate either single brain regions sensitive to speech production err...

  20. Analysis and control on road transportation of nuclear power equipment

    International Nuclear Information System (INIS)

    Road transportation of nuclear power equipment is an important link between after-manufacture and before-installation, and it is an essential stage that the manufacture value transfers to the installation and operation value. Taking the transportation of pressurizer for Unit 3 as an example, the article analyses an assortment of potential risks during transportation and puts forward measures to control such risks, in the hope of improving the quality control of transportation. (authors)

  1. 4f and 5d energy levels of the divalent and trivalent lanthanide ions in M2Si5N8 (M=Ca, Sr, Ba)

    International Nuclear Information System (INIS)

    Optical data of Sm, Tb and Yb doped Ca2Si5N8 and Sr2Si5N8 phosphors that have been prepared by solid-state synthesis, are presented. Together with luminescence data from literature on Ce3+ and Eu2+ doping in the M2Si5N8 (M=Ca, Sr, Ba) hosts, energy level schemes were constructed showing the energy of the 4f and 5d levels of all divalent and trivalent lanthanide ions relative to the valence and conduction band. The schemes were of great help in interpreting the optical data of the lanthanide doped phosphors and allow commenting on the valence stability of the ions, as well as the stability against thermal quenching of the Eu2+d–f emission. Tb3+ substitutes on both a high energy and a low energy site in Ca2Si5N8, due to which excitation at 4.77 eV led to emission from both the 5D3 and 5D4 levels, while excitation at 4.34 eV gave rise to mainly 5D4 emission. Doping with Sm resulted in typical Sm3+f–f line absorption, as well as an absorption band around 4.1 eV in Ca2Si5N8 and 3.6 eV in Sr2Si5N8 that could be identified as the Sm3+ charge transfer band. Yb on the other hand was incorporated in both the divalent and the trivalent state in Ca2Si5N8. - Graphical abstract: Energy level schemes showing the 4f ground states of the trivalent (?) and divalent (?) lanthanide ions and lowest energy 5d states of the trivalent (?) and divalent (?) ions with respect to the valence and conduction bands of Ca2Si5N8 (left) and Sr2Si5N8 (right). Highlights: ? Construction of energy level schemes of all lanthanides within the M2Si5N8 hosts. ? Construction was done by analyzing existing as well as new spectroscopic data. ? Tb3+d–f emission from two different Ca sites in Ca2Si5N8 has been observed. ? Observation of the Sm3+ charge transfer band in Ca2Si5N8 and Sr2Si5N8. ? Ytterbium has been found in the divalent and trivalent state in Ca2Si5N8.

  2. Design and Performance Analysis of a Nonstandard EPICS Fast Controller

    Science.gov (United States)

    Jugo, J.; Eguiraun, M.; Badillo, I.; Arredondo, I.; Piso, D.

    2015-06-01

    The large scientific projects present new technological challenges, such as the distributed control over a communication network. In particular, the middleware EPICS is the most extended communication standard in particle accelerators. The integration of modern control architectures in these EPICS networks is becoming common, as for example for the PXI/PXIe and xTCA hardware alternatives. In this work, a different integration procedure for PXIe real time controllers from National Instruments is proposed, using LabVIEW as the design tool. This methodology is considered and its performance is analyzed by means of a set of laboratory experiments. This control architecture is proposed for achieving the implementation requirements of the fast controllers, which need an important amount of computational power and signal processing capability, with a tight real-time demand. The present work studies the advantages and drawbacks of this methodology and presents its comprehensive evaluation by means of a laboratory test bench, designed for the application of systematic tests. These tests compare the proposed fast controller performance with a similar system implemented using an standard EPICS IOC provided by the CODAC system.

  3. Analysis on electronic control unit of continuously variable transmission

    Science.gov (United States)

    Cao, Shuanggui

    Continuously variable transmission system can ensure that the engine work along the line of best fuel economy, improve fuel economy, save fuel and reduce harmful gas emissions. At the same time, continuously variable transmission allows the vehicle speed is more smooth and improves the ride comfort. Although the CVT technology has made great development, but there are many shortcomings in the CVT. The CVT system of ordinary vehicles now is still low efficiency, poor starting performance, low transmission power, and is not ideal controlling, high cost and other issues. Therefore, many scholars began to study some new type of continuously variable transmission. The transmission system with electronic systems control can achieve automatic control of power transmission, give full play to the characteristics of the engine to achieve optimal control of powertrain, so the vehicle is always traveling around the best condition. Electronic control unit is composed of the core processor, input and output circuit module and other auxiliary circuit module. Input module collects and process many signals sent by sensor and , such as throttle angle, brake signals, engine speed signal, speed signal of input and output shaft of transmission, manual shift signals, mode selection signals, gear position signal and the speed ratio signal, so as to provide its corresponding processing for the controller core.

  4. Handling Missing Values with Regularized Iterative Multiple Correspondence Analysis

    OpenAIRE

    Josse, Julie; Chavent, Marie; Liquet, Benoit; Husson, François

    2012-01-01

    A common approach to deal with missing values in multivariate exploratory data analysis consists in minimizing the loss function over all non-missing elements. This can be achieved by EM-type algorithms where an iterative imputation of the missing values is performed during the estimation of the axes and components. This paper proposes such an algorithm, named iterative multiple correspondence analysis, to handle missing values in multiple correspondence analysis (MCA). This algorithm, based ...

  5. Control analysis as a tool to understand the formation of the las operon in Lactococcus lactis

    DEFF Research Database (Denmark)

    KØbmann, Brian Jensen; Solem, Christian

    2005-01-01

    In Lactococcus lactis the enzymes phosphofructokinase (PFK), pyruvate kinase (PK) and lactate dehydrogenase (LDH) are uniquely encoded in the las operon and we here apply Metabolic Control Analysis to study the role of this organisation. Earlier work showed that LDH at wildtype level has zero control on glycolysis and growth rate but high negative control on formate production. We find that PFK and PK have zero control on glycolysis and growth rate at the wildtype enzyme level but both enzymes exert strong positive control on the glycolytic flux at reduced activities. PK has high positive control on formate and acetate production, whereas PFK has no control on these fluxes. Decreased expression of the entire las operon resulted in a strong decrease in growth rate and the glycolytic flux; at 53% expression of the las operon the glycolytic flux was reduced to 44% and the flux control coefficient increased towards 3. Increased las expression resulted in a slight decrease in the glycolytic flux. At the wildtype level the control was close to zero on both glycolysis and the pyruvate branches. The sum of control coefficients for the three enzymes individually was comparable to the control coefficient found for the entire operon; the strong positive control by PK almost cancels out the negative control by LDH on formate production. The analysis suggests that co-regulation of PFK and PK provides a very efficient way to regulate glycolysis, and co-regulating PK and LDH allows the cells to maintain homolactic fermentation during regulation of glycolysis.

  6. Analysis of femtosecond quantum control mechanisms with colored double pulses

    Science.gov (United States)

    Vogt, Gerhard; Nuernberger, Patrick; Selle, Reimer; Dimler, Frank; Brixner, Tobias; Gerber, Gustav

    2006-09-01

    Fitness landscapes based on a limited number of laser pulse shape parameters can elucidate reaction pathways and can help to find the underlying control mechanism of optimal pulses determined by adaptive femtosecond quantum control. In a first experiment, we employ colored double pulses and systematically scan both the temporal subpulse separation and the relative amplitude of the two subpulses to acquire fitness landscapes. Comparison with results obtained from a closed-loop experiment demonstrates the capability of fitness landscapes for the revelation of possible control mechanisms. In a second experiment, using transient absorption spectroscopy, we investigate and compare the dependence of the excitation efficiency of the solvated dye molecule 5,5' -dichloro-11-diphenylamino- 3,3' -diethyl-10,12-ethylene thiatricarbocyanine perchlorate (IR140) on selected pulse shapes in two parametrizations. The results show that very different pulse profiles can be equivalently adequate to maximize a given control objective. Fitness landscapes thus provide valuable information about different pathways along which a molecular system can be controlled with shaped laser pulses.

  7. Analysis of femtosecond quantum control mechanisms with colored double pulses

    International Nuclear Information System (INIS)

    Fitness landscapes based on a limited number of laser pulse shape parameters can elucidate reaction pathways and can help to find the underlying control mechanism of optimal pulses determined by adaptive femtosecond quantum control. In a first experiment, we employ colored double pulses and systematically scan both the temporal subpulse separation and the relative amplitude of the two subpulses to acquire fitness landscapes. Comparison with results obtained from a closed-loop experiment demonstrates the capability of fitness landscapes for the revelation of possible control mechanisms. In a second experiment, using transient absorption spectroscopy, we investigate and compare the dependence of the excitation efficiency of the solvated dye molecule 5,5'-dichloro-11-diphenylamino-3,3'-diethyl-10,12-ethylene thiatricarbocyanine perchlorate (IR140) on selected pulse shapes in two parametrizations. The results show that very different pulse profiles can be equivalently adequate to maximize a given control objective. Fitness landscapes thus provide valuable information about different pathways along which a molecular system can be controlled with shaped laser pulses

  8. Analysis and Synthesis of the SNS Superconducting RF Control System

    CERN Document Server

    Wang, Y M; Regan, A H

    2000-01-01

    The RF system for the SNS superconducting linac consists of a superconducting cavity, a klystron, and a low-level RF (LLRF) control system. For a proton linac like SNS, the field in each individual cavity needs to be controlled to meet the overall system requirements. The purpose of the LLRF control system is to maintain the RF cavity field to a desired magnitude and phase by controlling the klystron driver signal. The Lorentz force detuning causes the shift of the resonant frequency during the normal operation in the order of a few hundreds hertz. In order to compensate the Lorentz force detuning effects, the cavity is pre-tuned into the middle of the expected frequency shift caused by the Lorentz force detuning. Meanwhile, to reduce the overshoot in the transient response, a feed-forward algorithm, a linear parameter varying gain scheduling (LPV-GS) controller, is proposed to get away a repetitive noised caused by the pulsed operation as well as the Lorentz force detuning effects.

  9. Material Control and Accounting Design Considerations for High-Temperature Gas Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Trond Bjornard; John Hockert

    2011-08-01

    The subject of this report is domestic safeguards and security by design (2SBD) for high-temperature gas reactors, focusing on material control and accountability (MC&A). The motivation for the report is to provide 2SBD support to the Next Generation Nuclear Plant (NGNP) project, which was launched by Congress in 2005. This introductory section will provide some background on the NGNP project and an overview of the 2SBD concept. The remaining chapters focus specifically on design aspects of the candidate high-temperature gas reactors (HTGRs) relevant to MC&A, Nuclear Regulatory Commission (NRC) requirements, and proposed MC&A approaches for the two major HTGR reactor types: pebble bed and prismatic. Of the prismatic type, two candidates are under consideration: (1) GA's GT-MHR (Gas Turbine-Modular Helium Reactor), and (2) the Modular High-Temperature Reactor (M-HTR), a derivative of Areva's Antares reactor. The future of the pebble-bed modular reactor (PBMR) for NGNP is uncertain, as the PBMR consortium partners (Westinghouse, PBMR [Pty] and The Shaw Group) were unable to agree on the path forward for NGNP during 2010. However, during the technology assessment of the conceptual design phase (Phase 1) of the NGNP project, AREVA provided design information and technology assessment of their pebble bed fueled plant design called the HTR-Module concept. AREVA does not intend to pursue this design for NGNP, preferring instead a modular reactor based on the prismatic Antares concept. Since MC&A relevant design information is available for both pebble concepts, the pebble-bed HTGRs considered in this report are: (1) Westinghouse PBMR; and (2) AREVA HTR-Module. The DOE Office of Nuclear Energy (DOE-NE) sponsors the Fuel Cycle Research and Development program (FCR&D), which contains an element specifically focused on the domestic (or state) aspects of SBD. This Material Protection, Control and Accountancy Technology (MPACT) program supports the present work summarized in this report, namely the development of guidance to support the consideration of MC&A in the design of both pebble-bed and prismatic-fueled HTGRs. The objective is to identify and incorporate design features into the facility design that will cost effectively aid in making MC&A more effective and efficient, with minimum impact on operations. The theft of nuclear material is addressed through both MC&A and physical protection, while the threat of sabotage is addressed principally through physical protection.

  10. Spatial Analysis for Flood Control by Using Environmental Modeling

    OpenAIRE

    Alireza Gharagozlou; Hassan Nazari; Mohammadjavad Seddighi

    2011-01-01

    To create the final spatial information and analysis, flood hazard maps and land development priority maps and information, data for the flood events to 2009 in north of Iran were incorporated with using Geo-spatial Information System data of physiographic divisions, geologic divisions, land cover classification, elevation, drainage network, administrative districts and population density and environmental parameters modeling. Special analysis also attention was paid to population density for...

  11. Flow Characteristics Analysis of Widows' Creek Type Control Valve for Steam Turbine Control

    International Nuclear Information System (INIS)

    The steam turbine converts the kinetic energy of steam to mechanical energy of rotor blades in the power conversion system of fossil and nuclear power plants. The electric output from the generator of which the rotor is coupled with that of the steam turbine depends on the rotation velocity of the steam turbine bucket. The rotation velocity is proportional to the mass flow rate of steam entering the steam turbine through valves and nozzles. Thus, it is very important to control the steam mass flow rate for the load following operation of power plants. Among various valves that control the steam turbine, the control valve is most significant. The steam flow rate is determined by the area formed by the stem disk and the seat of the control valve. While the ideal control valve linearly controls the steam mass flow rate with its stem lift, the real control valve has various flow characteristic curves pursuant to the stem lift type. Thus, flow characteristic curves are needed to precisely design the control valves manufactured for the operating conditions of nuclear power plants. OMEGA (Optimized Multidimensional Experiment Geometric Apparatus) was built to experimentally study the flow characteristics of steam flowing inside the control valve. The Widows' Creek type control valve was selected for reference. Air was selected as the working fluid in the OMEGA loop to exclude the condensation effect in this simplified approach. Flow characteristic curves were plotted by calculating the ratio of the measured mass flow rate versus the theoretical mass flow rate of the air. The flow characteristic curves are expected to be utilized to accurately design and operate the control valve for fossil as well as nuclear plants. (authors)

  12. Analysis of Decentralized Control for Absorption Cycle Heat Pumps

    DEFF Research Database (Denmark)

    Vinther, Kasper; Just Nielsen, Rene

    2015-01-01

    This paper investigates decentralized control structures for absorption cycle heat pumps and a dynamic nonlinear model of a single-effect LiBr-water absorption system is used as case study. The model has four controllable inputs, which can be used to stabilize the operation of the heat pump under different load conditions. Different feasible input-output pairings are analyzed by computation of relative gain array matrices and scaled condition numbers, which indicate the best pairing choice and the potential of each input-output set. Further, it is possible to minimize the effect of cross couplings and improve stability with the right pairing of input and output. Simulation of selected candidate input-output pairings demonstrate that decentralized control can provide stable operation of the heat pump.

  13. Analysis and control of a shunt active power filter

    Energy Technology Data Exchange (ETDEWEB)

    Ottersten, R.; Petersson, Andreas [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Electric Power Engineering

    1999-09-01

    This report deals with active power filtering of low-frequency current harmonics. The active filter consists of a forced-commutated voltage source inverter with a digital control system. The aim of this master thesis is to investigate the performance of a shunt active power filter, and the parameters influence on the system performance. Three different harmonic identification methods are presented and compared. The shunt active power filter is very well suited for harmonic current reduction, provided that the phase shift due to the digital implementation of the control system is compensated. The performance of the active power filter depends on the switching frequency. When using individual harmonic detection methods the amount of compensation can be fully controlled for each current harmonic.

  14. Planning and control of maintenance systems modelling and analysis

    CERN Document Server

    Duffuaa, Salih O

    2015-01-01

    Analyzing maintenance as an integrated system with objectives, strategies and processes that need to be planned, designed, engineered, and controlled using statistical and optimization techniques, the theme of this book is the strategic holistic system approach for maintenance. This approach enables maintenance decision makers to view maintenance as a provider of a competitive edge not a necessary evil. Encompassing maintenance systems; maintenance strategic and capacity planning, planned and preventive maintenance, work measurements and standards, material (spares) control, maintenance operations and control, planning and scheduling, maintenance quality, training, and others, this book gives readers an understanding of the relevant methodology and how to apply it to real-world problems in industry. Each chapter includes a number exercises and is suitable as a textbook or a reference for a professionals and practitioners whilst being of interest to industrial engineering, mechanical engineering, electrical en...

  15. Design and analysis of a rotary motion controller

    Directory of Open Access Journals (Sweden)

    Julio Cesar Caye

    2015-12-01

    Full Text Available This paper presents the design of a rotary motion controller based on the peritrochoid geometry of the rotary (Wankle engine. It uses an orifice limited flow of incompressible fluid between the chambers of the Wankle-type geometry to control the rotation of the rotor. The paper develops the theory of operation and then implements the design as a Matlab model to simulate the motion control under various conditions. It is found that the time to reach stabilised motion is determined by the orifice size and fluid density. When stabilised motion is achieved, the motion dependence on material and geometry factors is determined by the orifice flow equation. The angular velocity is also found to have a square root dependence on the applied torque when in the stabilised regime.

  16. Metodologias de controle de qualidade de análises granulométricas do solo Methodologies for quality control of soil particle size analysis

    Directory of Open Access Journals (Sweden)

    Vilson Antonio Klein

    2013-05-01

    Full Text Available A qualidade da análise granulométrica é imprescindível para a adequada classificação textural dos solos e enquadramento no Zoneamento Agroclimático. O objetivo deste trabalho foi avaliar metodologias de controle de qualidade das análises granulométricas. Foram coletadas amostras de solos com diferentes texturas, as quais foram analisadas por cinco laboratórios. O controle da qualidade foi realizado utilizando duas metodologias, uma proposta pelo Instituto Agronômico de Campinas (IAC e a outra pela Rede Oficial de Laboratórios de Análise de Solo e de Tecido Vegetal dos Estados do RS e SC (ROLAS. Verificou-se maior número de inconformidades para as frações argila e silte, independentemente do método, sendo que o método da ROLAS apresentou maior número de inconformidades (76% das amostras, principalmente para amostras com teores mais elevados dessas frações. A metodologia da ROLAS com utilização da mediana é mais rigorosa no controle da qualidade das análises.The quality of particle size analysis is essential for correct soil textural classification and defining the Brazilian Agroclimatic Zoning. The objectives were to evaluate methods of particle size analysis and develop a spreadsheet for use in quality control analyzes. We collected 50 soil samples with different particle size distribution, in RS and SC states of Brazil, which were analyzed by five laboratories in the two states that perform the soil particle size analysis using two methods: one proposed by the Campinas Agronomic Institute (IAC and the other by the Network of Soil and Plant Tissue Analysis Laboratories of the states of RS and SC (ROLAS. A greater number of disparities were observed for the clay and sand fractions regardless of the method. The ROLAS method had a higher number of mismatches (76% of samples, especially for samples with higher contents of those two fractions. The use of the median value in the ROLAS methodology is more rigorous in analysis quality control.

  17. Metodologias de controle de qualidade de análises granulométricas do solo / Methodologies for quality control of soil particle size analysis

    Scientific Electronic Library Online (English)

    Vilson Antonio, Klein; Tiago, Madalosso; José Miguel, Reichert; Luis Eduardo Akiyoshi Sanches, Suzuki; Milton da, Veiga; Jackson Adriano, Albuquerque; Eloy Antonio, Pauletto.

    2013-05-01

    Full Text Available A qualidade da análise granulométrica é imprescindível para a adequada classificação textural dos solos e enquadramento no Zoneamento Agroclimático. O objetivo deste trabalho foi avaliar metodologias de controle de qualidade das análises granulométricas. Foram coletadas amostras de solos com diferen [...] tes texturas, as quais foram analisadas por cinco laboratórios. O controle da qualidade foi realizado utilizando duas metodologias, uma proposta pelo Instituto Agronômico de Campinas (IAC) e a outra pela Rede Oficial de Laboratórios de Análise de Solo e de Tecido Vegetal dos Estados do RS e SC (ROLAS). Verificou-se maior número de inconformidades para as frações argila e silte, independentemente do método, sendo que o método da ROLAS apresentou maior número de inconformidades (76% das amostras), principalmente para amostras com teores mais elevados dessas frações. A metodologia da ROLAS com utilização da mediana é mais rigorosa no controle da qualidade das análises. Abstract in english The quality of particle size analysis is essential for correct soil textural classification and defining the Brazilian Agroclimatic Zoning. The objectives were to evaluate methods of particle size analysis and develop a spreadsheet for use in quality control analyzes. We collected 50 soil samples wi [...] th different particle size distribution, in RS and SC states of Brazil, which were analyzed by five laboratories in the two states that perform the soil particle size analysis using two methods: one proposed by the Campinas Agronomic Institute (IAC) and the other by the Network of Soil and Plant Tissue Analysis Laboratories of the states of RS and SC (ROLAS). A greater number of disparities were observed for the clay and sand fractions regardless of the method. The ROLAS method had a higher number of mismatches (76% of samples), especially for samples with higher contents of those two fractions. The use of the median value in the ROLAS methodology is more rigorous in analysis quality control.

  18. Comparative analysis of algorithms for lunar landing control

    Science.gov (United States)

    Zhukov, B. I.; Likhachev, V. N.; Sazonov, V. V.; Sikharulidze, Yu. G.; Tuchin, A. G.; Tuchin, D. A.; Fedotov, V. P.; Yaroshevskii, V. S.

    2015-11-01

    For the descent from the pericenter of a prelanding circumlunar orbit a comparison of three algorithms for the control of lander motion is performed. These algorithms use various combinations of terminal and programmed control in a trajectory including three parts: main braking, precision braking, and descent with constant velocity. In the first approximation, autonomous navigational measurements are taken into account and an estimate of the disturbances generated by movement of the fuel in the tanks was obtained. Estimates of the accuracy for landing placement, fuel consumption, and performance of the conditions for safe lunar landing are obtained.

  19. Harmonic analysis of EAST large power fast control power supply

    International Nuclear Information System (INIS)

    The multiple structure of three-level inverter is presented to satisfy the requirement of large current and quick control for the fast control power supply in the EAST tokamak, which applies carrier phase-shift PWM technology to realize multi-inverters parallel. The design scheme is analyzed, and the output harmonic characteristic of parallel inverters is studied, the analytic expression of harmonic of the output voltage is obtained by means of dual Fourier transformation. The simulation and experimental results confirm that the power supply system has a perfect performance on harmonic feature, can supply large current and has ability of fast response. (authors)

  20. Qualitative analysis and control of complex neural networks with delays

    CERN Document Server

    Wang, Zhanshan; Zheng, Chengde

    2016-01-01

    This book focuses on the stability of the dynamical neural system, synchronization of the coupling neural system and their applications in automation control and electrical engineering. The redefined concept of stability, synchronization and consensus are adopted to provide a better explanation of the complex neural network. Researchers in the fields of dynamical systems, computer science, electrical engineering and mathematics will benefit from the discussions on complex systems. The book will also help readers to better understand the theory behind the control technique and its design.

  1. Knowledge based systems: From process control to policy analysis

    Energy Technology Data Exchange (ETDEWEB)

    Marinuzzi, J.G.

    1993-06-01

    Los Alamos has been pursuing the use of Knowledge Based Systems for many years. These systems are currently being used to support projects that range across many production and operations areas. By investing time and money in people and equipment, Los Alamos has developed one of the strongest knowledge based systems capabilities within the DOE. Staff of Los Alamos` Mechanical & Electronic Engineering Division are using these knowledge systems to increase capability, productivity and competitiveness in areas of manufacturing quality control, robotics, process control, plant design and management decision support. This paper describes some of these projects and associated technical program approaches, accomplishments, benefits and future goals.

  2. Knowledge based systems: From process control to policy analysis

    Energy Technology Data Exchange (ETDEWEB)

    Marinuzzi, J.G.

    1993-01-01

    Los Alamos has been pursuing the use of Knowledge Based Systems for many years. These systems are currently being used to support projects that range across many production and operations areas. By investing time and money in people and equipment, Los Alamos has developed one of the strongest knowledge based systems capabilities within the DOE. Staff of Los Alamos' Mechanical Electronic Engineering Division are using these knowledge systems to increase capability, productivity and competitiveness in areas of manufacturing quality control, robotics, process control, plant design and management decision support. This paper describes some of these projects and associated technical program approaches, accomplishments, benefits and future goals.

  3. Parametric Analysis of Controllers for Constrained Linear Systems

    OpenAIRE

    Baric, Miroslav; Jones, Colin; Morari, Manfred

    2006-01-01

    We analyze properties of closed-loop systems based on explicit model predictive control (MPC) when parameters of the controllers are changing. Formulation of the problem in the framework of MPC with a cost based on piecewise linear norms leads to the generalized multi-parametric linear program containing parameters both in the cost and in the constraints. The focus of the paper is on describing a novel simplex-based algorithm for solving such a class of problems. The algorithm uses the concep...

  4. Monte Carlo sensitivity analysis of an Eulerian large-scale air pollution model

    International Nuclear Information System (INIS)

    Variance-based approaches for global sensitivity analysis have been applied and analyzed to study the sensitivity of air pollutant concentrations according to variations of rates of chemical reactions. The Unified Danish Eulerian Model has been used as a mathematical model simulating a remote transport of air pollutants. Various Monte Carlo algorithms for numerical integration have been applied to compute Sobol's global sensitivity indices. A newly developed Monte Carlo algorithm based on Sobol's quasi-random points MCA-MSS has been applied for numerical integration. It has been compared with some existing approaches, namely Sobol's ??? sequences, an adaptive Monte Carlo algorithm, the plain Monte Carlo algorithm, as well as, eFAST and Sobol's sensitivity approaches both implemented in SIMLAB software. The analysis and numerical results show advantages of MCA-MSS for relatively small sensitivity indices in terms of accuracy and efficiency. Practical guidelines on the estimation of Sobol's global sensitivity indices in the presence of computational difficulties have been provided. - Highlights: ? Variance-based global sensitivity analysis is performed for the air pollution model UNI-DEM. ? The main effect of input parameters dominates over higher-order interactions. ? Ozone concentrations are influenced mostly by variability of three chemical reactions rates. ? The newly developed MCA-MSS for multidimensional integration is compared with other approaches. ? More precise approaches like MCA-MSS should be applied when the needed accuracy has not been achieved.

  5. Analysis and control of excitation, field weakening and stability in direct torque controlled electrically excited synchronous motor drives

    Energy Technology Data Exchange (ETDEWEB)

    Pyrhoenen, O.

    1998-12-31

    Direct torque control (DTC) is a new control method for rotating field electrical machines. DTC controls directly the motor stator flux linkage with the stator voltage, and no stator current controllers are used. With the DTC method very good torque dynamics can be achieved. Until now, DTC has been applied to asynchronous motor drives. The purpose of this work is to analyse the applicability of DTC to electrically excited synchronous motor drives. Compared with asynchronous motor drives, electrically excited synchronous motor drives require an additional control for the rotor field current. The field current control is called excitation control in this study. The dependence of the static and dynamic performance of DTC synchronous motor drives on the excitation control has been analysed and a straightforward excitation control method has been developed and tested. In the field weakening range the stator flux linkage modulus must be reduced in order to keep the electro motive force of the synchronous motor smaller than the stator voltage and in order to maintain a sufficient voltage reserve. The dynamic performance of the DTC synchronous motor drive depends on the stator flux linkage modulus. Another important factor for the dynamic performance in the field weakening range is the excitation control. The field weakening analysis considers both dependencies. A modified excitation control method, which maximises the dynamic performance in the field weakening range, has been developed. In synchronous motor drives the load angle must be kept in a stabile working area in order to avoid loss of synchronism. The traditional vector control methods allow to adjust the load angle of the synchronous motor directly by the stator current control. In the DTC synchronous motor drive the load angle is not a directly controllable variable, but it is formed freely according to the motor`s electromagnetic state and load. The load angle can be limited indirectly by limiting the torque reference. This method is however parameter sensitive and requires a safety margin between the theoretical torque maximum and the actual torque limit. The DTC modulation principle allows however a direct load angle adjustment without any current control. In this work a direct load angle control method has been developed. The method keeps the drive stabile and allows the maximal utilisation of the drive without a safety margin in the torque limitation. (orig.) 39 refs.

  6. 21 CFR 123.6 - Hazard analysis and Hazard Analysis Critical Control Point (HACCP) plan.

    Science.gov (United States)

    2010-04-01

    ... (a) Hazard analysis. Every processor...for it, a hazard analysis to determine...experience, illness data, scientific reports...whenever a hazard analysis reveals one or...contamination; (iii) Chemical contamination...processor. This signature shall signify...

  7. Historical analysis of SO2 pollution control policies in China.

    Science.gov (United States)

    Gao, Cailing; Yin, Huaqiang; Ai, Nanshan; Huang, Zhengwen

    2009-03-01

    Coal is not only an important energy source in China but also a major source of air pollution. Because of this, China's national sulfur dioxide (SO(2)) emissions have been the highest in the world for many years, and since the 1990s, the territory of China's south and southwest has become the third largest acid-rain-prone region in the world. In order to control SO(2) emissions, the Chinese government has formulated and promulgated a series of policies and regulations, but it faces great difficulties in putting them into practice. In this retrospective look at the history of SO(2) control in China, we found that Chinese SO(2) control policies have become increasingly strict and rigid. We also found that the environmental policies and regulations are more effective when central officials consistently give environmental protection top priority. Achieving China's environmental goals, however, has been made difficult by China's economic growth. Part of this is due to the practice of environmental protection appearing in the form of an ideological "campaign" or "storm" that lacks effective economic measures. More recently, better enforcement of environmental laws and regulations has been achieved by adding environmental quality to the performance assessment metrics for leaders at all levels. To continue making advances, China needs to reinforce the economic and environmental assessments for pollution control projects and work harder to integrate economic measures into environmental protection. Nonetheless, China has a long way to go before economic growth and environmental protection are balanced. PMID:19159968

  8. Spectrometry measurement prospects for industry on-line analysis and water control

    International Nuclear Information System (INIS)

    Industrial on-line control is developing; manifestation of this development is spectrometry. Application examples to complex analysis are given. Then more recent techniques of on line spectrometry with optical fibers are given

  9. Bifurcation Tools for Flight Dynamics Analysis and Control System Design Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The purpose of the project is the development of a computational package for bifurcation analysis and advanced flight control of aircraft. The development of...

  10. Design of Launch Vehicle Flight Control Systems Using Ascent Vehicle Stability Analysis Tool

    Science.gov (United States)

    Jang, Jiann-Woei; Alaniz, Abran; Hall, Robert; Bedossian, Nazareth; Hall, Charles; Jackson, Mark

    2011-01-01

    A launch vehicle represents a complicated flex-body structural environment for flight control system design. The Ascent-vehicle Stability Analysis Tool (ASAT) is developed to address the complicity in design and analysis of a launch vehicle. The design objective for the flight control system of a launch vehicle is to best follow guidance commands while robustly maintaining system stability. A constrained optimization approach takes the advantage of modern computational control techniques to simultaneously design multiple control systems in compliance with required design specs. "Tower Clearance" and "Load Relief" designs have been achieved for liftoff and max dynamic pressure flight regions, respectively, in the presence of large wind disturbances. The robustness of the flight control system designs has been verified in the frequency domain Monte Carlo analysis using ASAT.

  11. Randomized Algorithms for Analysis and Control of Uncertain Systems With Applications

    CERN Document Server

    Tempo, Roberto; Dabbene, Fabrizio

    2013-01-01

    The presence of uncertainty in a system description has always been a critical issue in control. The main objective of Randomized Algorithms for Analysis and Control of Uncertain Systems, with Applications (Second Edition) is to introduce the reader to the fundamentals of probabilistic methods in the analysis and design of systems subject to deterministic and stochastic uncertainty. The approach propounded by this text guarantees a reduction in the computational complexity of classical  control algorithms and in the conservativeness of standard robust control techniques. The second edition has been thoroughly updated to reflect recent research and new applications with chapters on statistical learning theory, sequential methods for control and the scenario approach being completely rewritten.   Features: ·         self-contained treatment explaining Monte Carlo and Las Vegas randomized algorithms from their genesis in the principles of probability theory to their use for system analysis; ·    ...

  12. REAL TIME ANALYSIS OF WIRELESS CONTROLLER AREA NETWORK

    Directory of Open Access Journals (Sweden)

    Gerardine Immaculate Mary

    2014-09-01

    Full Text Available It is widely known that Control Area Networks (CAN are used in real-time, distributed and parallel processing which cover manufacture plants, humanoid robots, networking fields, etc., In applications where wireless conditions are encountered it is convenient to continue the exchange of CAN frames within the Wireless CAN (WCAN. The WCAN considered in this research is based on wireless token ring protocol (WTRP; a MAC protocol for wireless networks to reduce the number of retransmissions due to collision and the wired counterpart CAN attribute on message based communication. WCAN uses token frame method to provide channel access to the nodes in the system. This method allow all the nodes to share common broadcast channel by taken turns in transmitting upon receiving the token frame which is circulating within the network for specified amount of time. This method provides high throughput in bounded latency environment, consistent and predictable delays and good packet delivery ratio. The most important factor to consider when evaluating a control network is the end-to-end time delay between sensors, controllers, and actuators. The correct operation of a control system depends on the timeliness of the data coming over the network, and thus, a control network should be able to guarantee message delivery within a bounded transmission time. The proposed WCAN is modeled and simulated using QualNet, and its average end to end delay and packet delivery ratio (PDR are calculated. The parameters boundaries of WCAN are evaluated to guarantee a maximum throughput and a minimum latency time, in the case of wireless communications, precisely WCAN.

  13. Quantitative analysis by computer controlled X-ray fluorescence spectrometer

    International Nuclear Information System (INIS)

    X-ray fluorescence spectroscopy has become a widely accepted method in the metallurgical field for analysis of both minor and major elements. As encountered in many other analytical techniques, the problem of matrix effect generally known as the interelemental effects is to be dealt with effectively in order to make the analysis accurate. There are several methods by which the effects of matrix on the analyte are minimised or corrected for and the mathematical correction is one among them. In this method the characteristic secondary X-ray intensities are measured from standard samples and correction coefficients. If any, for interelemental effects are evaluated by mathematical calculations. This paper describes attempts to evaluate the correction coefficients for interelemental effects by multiple linear regression programmes using a computer for the quantitative analysis of stainless steel and a nickel base cast alloy. The quantitative results obtained using this method for a standard stainless steel sample are compared with the given certified values. (author)

  14. Stability Analysis of DC-link Voltage Control on Autonomous Micro Hydro Power Plant System

    Directory of Open Access Journals (Sweden)

    Feri Yusivar

    2014-12-01

    Full Text Available Micro Hydro Power Plant has become one of the interesting topics to be researched nowadays. This paper deals with the stability analysis on control system of excitation voltage in Micro Hydro Power Plant. The control of this voltage can be achieved by controlling the Permanent Magnet Synchronous Machine (PMSM with particular algorithm so the voltage on the DC-link part of the system can be controlled. Without knowing the exact specification of system parameters, the system will be most likely unstable. The DC-link control system is modeled, simulated, and mathematically analyzed so the parameter specification for the stable system can be obtained.

  15. Individual Channel Analysis of the Thyristor-Controlled Series Compensator Performance

    OpenAIRE

    Ugalde Loo, Carlos Ernesto; Acha, Enrique; Liceaga-Castro, Eduardo; Vanfretti, Luigi

    2010-01-01

    The TCSC is the electronically-controlled counterpart of the conventional series bank of capacitors. A mature member of the FACTS technology, the TCSC has the ability to regulate power flows along the compensated line and to rapidly modulate its effective impedance. In this paper its performance is evaluated using Individual Channel Analysis and Design. Fundamental analysis is carried out to explain the generator dynamic behavior as affected by the TCSC. Moreover, a control system design for ...

  16. Dynamic modeling and controllability analysis of an ethanol reformer for fuel cell application

    OpenAIRE

    García, Vanesa M.; López, Eduardo; Serra, Maria; Llorca, Jordi; Riera, Jordi

    2010-01-01

    This work presents a controllability analysis of a low temperature ethanol reformer based on a cobalt catalyst for fuel cell application. The study is based on a nonlinear dynamic model of a reformer which operates in three separate stages: ethanol dehydrogenation to acetaldehyde and hydrogen, acetaldehyde steam reforming, and water gas shift reaction. The controllability analysis is focused on the rapid dynamics due to mass balances and is based on a linearization of the complex non-linear m...

  17. Schedule Control of Coal Mine Construction Projects Based on Factor Analysis

    OpenAIRE

    Lingling Fan; Hui Zhang; Xiao Li

    2013-01-01

    Schedule management is the crucial capability for large-scale coal mining investors to successful finish the construction project, which could get by the accumulation of the long-time institutional executive force and ability training. By using factor analysis and validation analysis, extracted control factors of schedule management from data have been made in large coal mine construction companies. Some control factors have a greater influence on the schedule management which are the system ...

  18. Control and Analysis of Costs Based On Results Account of the ABC method

    OpenAIRE

    Sorinel Capusneanu; Sorin Briciu

    2011-01-01

    This paper presents a modality of control and cost analysis based on the results account of Activity-Based Costing method. The results account model and situations for determining deviations are presented based on the purpose, composition and classification in the existing literature. There are presented the statements for determining costs deviations resulting from their control and analysis in terms of pilot indicators, all highlighted by a case study application. The article ends with the ...

  19. A System Analysis Approach to Robot Gripper Control Using Phase Lag Compensator Bode Designs

    Science.gov (United States)

    Aye, Khin Muyar; Lin, Htin; Tun, Hla Myo

    2008-10-01

    In this paper, we introduce the result comparisons that were developed for the phase lag compensator design using Bode Plots. The implementation of classical experiments as MATLAB m-files is described. Robot gripper control system can be designed to gain insight into a variety of concepts, including stabilization of unstable systems, compensation properties, Bode analysis and design. The analysis has resulted in a number of important conclusions for the design of a new generation of control support systems.

  20. Successful risk assessment may not always lead to successful risk control: A systematic literature review of risk control after root cause analysis.

    Science.gov (United States)

    Card, Alan J; Ward, James; Clarkson, P John

    2012-01-01

    Root cause analysis is perhaps the most widely used tool in healthcare risk management, but does it actually lead to successful risk control? Are there categories of risk control that are more likely to be effective? And do healthcare risk managers have the tools they need to support the risk control process? This systematic review examines how the healthcare sector translates risk analysis to risk control action plans and examines how to do better. It suggests that the hierarchy of risk controls should inform risk control action planning and that new tools should be developed to improve the risk control process. PMID:22359258

  1. The Control System Modeling and The Mechanical Structure Analysis For EMCVT

    Directory of Open Access Journals (Sweden)

    Lei ZHANG

    2013-07-01

    Full Text Available The current automotive metallic belt continuously variable transmission (CVT mostly use hydraulic system to push the cone disc and achieve the speed ratio control. A new Electrical Mechanical Continuously Variable Transmission without hydraulic control (Electrical Mechanical CVT, EMCVT studied in this paper, uses the rolling screw mechanism to press cone disc, achieves speed regulation through the electronic control mechanism, and abandons the energy-intensive hydraulic system. In this paper, based on the analysis of mechanical configuration, the EMCVT's transmission system and its speed regulation process, speed ratio control characteristic and the clamping force control feature are studied and modeled. Besides, the Control strategy of the transmission system driven by motor is built, so as to provide an important theoretical basis for the further building of EMVCT's control system and the selection and implementation of Control strategy.

  2. Analysis of factors influencing local control of esophageal carcinoma treated by radiotherapy

    International Nuclear Information System (INIS)

    Factors considered to influence local control of esophageal squamous cell carcinoma treated with radiotherapy were analyzed retrospectively using multivariate method. This study involved 65 patients who had received more than 60 Gy between 1982 and 1990 at Niigata University Hospital. There were 22 cases with locally controlled lesions at the time of analysis. The two-year local control rate was 32%. Factors studied for the analysis included sex, age, performance status, tumor location, radiologic type, T-stage, tumor volume, tumor length, radiation dose, and type of chemotherapy. As a result, radiologic type, T-stage, tumor location and age were considered to be important to predict local control. Tumor volume did not influence local control significantly. In patients with radiographically ulcerative and localized type lesions, however, tumors with a volume of greater than 80 cm3 failed more frequently than those with less than 80 cm3. It is suggested that tumor volume can predict local control in such cases. (author)

  3. System analysis applied for controlling the quality of metallurgical rollers

    OpenAIRE

    L. Wojtynek

    2010-01-01

    In the work, the system analysis in the foundry where the quality management system has been implemented was described. The generalized model of the foundry’s production system was presented taking the company’s surrounding and process attitude into account.

  4. Controllability analysis of transcriptional regulatory networks reveals circular control patterns among transcription factors

    DEFF Research Database (Denmark)

    Österlund, Tobias; Bordel, Sergio

    2015-01-01

    Transcriptional regulation is the most committed type of regulation in living cells where transcription factors (TFs) control the expression of their target genes and TF expression is controlled by other TFs forming complex transcriptional regulatory networks that can be highly interconnected. Here we analyze the topology and organization of nine transcriptional regulatory networks for E. coli, yeast, mouse and human, and we evaluate how the structure of these networks influences two of their key properties, namely controllability and stability. We calculate the controllability for each network as a measure of the organization and interconnectivity of the network. We find that the number of driver nodes n(D) needed to control the whole network is 64% of the TFs in the E. coli transcriptional regulatory network in contrast to only 17% for the yeast network, 4% for the mouse network and 8% for the human network. The high controllability (low number of drivers needed to control the system) in yeast, mouse and human is due to the presence of internal loops in their regulatory networks where the TFs regulate each other in a circular fashion. We refer to these internal loops as circular control motifs (CCM). The E. coli transcriptional regulatory network, which does not have any CCMs, shows a hierarchical structure of the transcriptional regulatory network in contrast to the eukaryal networks. The presence of CCMs also has influence on the stability of these networks, as the presence of cycles can be associated with potential unstable steady-states where even small changes in binding affinities can cause dramatic rearrangements of the state of the network.

  5. Comparative Analysis of the CERN Accelerator Control Systems

    CERN Document Server

    Watson, C

    1998-01-01

    In the framework of a future unique accelerator control structure for the LHC era, the convergence of the PS and SL systems was relaunched in 1997. The present study was triggered by a directive from the SL and PS Divisions to investigate and propose concrete actions. The two systems are compared in the areas of server architecture, networking capabilities including performance and flexibility, support for generic, re-configurable applications, and general purpose operator interfaces. Additional sub-systems covered by this report include the timing system software, error reporting, and the alarm sub-system. Areas where duplication of effort exists are noted, as are areas where each system could profit from the strengths of the other system. Additionally, areas are pointed out where features are missing from both systems as compared to other state- of-the-art accelerator control systems. A set of specific recommendations is proposed leading in the direction of future integration of these two systems. features ...

  6. Vehicle-manipulator systems modeling for simulation, analysis, and control

    CERN Document Server

    From, Pal Johan; Pettersen, Kristin Ytterstad

    2014-01-01

    Furthering the aim of reducing human exposure to hazardous environments, this monograph presents a detailed study of the modeling and control of vehicle-manipulator systems. The text shows how complex interactions can be performed at remote locations using systems that combine the manipulability of robotic manipulators with the ability of mobile robots to locomote over large areas.  The first part studies the kinematics and dynamics of rigid bodies and standard robotic manipulators and can be used as an introduction to robotics focussing on robust mathematical modeling. The monograph then moves on to study vehicle-manipulator systems in great detail with emphasis on combining two different configuration spaces in a mathematically sound way. Robustness of these systems is extremely important and Modeling and Control of Vehicle-manipulator Systems effectively represents the dynamic equations using a mathematically robust framework. Several tools from Lie theory and differential geometry are used to obtain glob...

  7. Effects of joint controller on analytical modal analysis of rotational flexible manipulator

    Science.gov (United States)

    Chu, Ming; Zhang, Yanheng; Chen, Gang; Sun, Hanxu

    2015-04-01

    Modal analysis is a fundamental and important task for modeling and control of the flexible manipulator. However, almost all of the traditional modal analysis methods view the flexible manipulator as a pure mechanical structure and neglect feedback action of joint controller. In order to study the effects of joint controller on the modal analysis of rotational flexible manipulator, a closed-loop analytical modal analysis method is proposed. Firstly, two exact boundary constraints, namely servo feedback constraint and bending moment constraint, are derived to solve the vibration partial differential equation. It is found that the stiffness and damping gains of joint controller are both included in the boundary conditions, which lead to an unconventional secular term. Secondly, analytical algorithm based on Ritz approach is developed by using Laplace transform and complex modal approach to obtain the natural frequencies and mode shapes. And then, the numerical simulations are performed and the computational results show that joint controller has pronounced influence on the modal parameters: joint controller stiffness reduces the natural frequency, while joint controller damping makes the shape phase non-zero. Furthermore, the validity of the presented conclusion is confirmed through experimental studies. These findings are expected to improve the performance of dynamics simulation systems and model-based controllers.

  8. The Stroop Revisited: A Meta-Analysis of Interference Control in AD/HD

    Science.gov (United States)

    Van Mourik, Rosa; Oosterlaan, Jaap; Sergeant, Joseph A.

    2005-01-01

    Background: An inhibition deficit, including poor interference control, has been implicated as one of the core deficits in AD/HD. Interference control is clinically measured by the Stroop Colour-Word Task. The aim of this meta-analysis was to investigate the strength of an interference deficit in AD/HD as measured by the Stroop Colour-Word Task…

  9. Analysis, preliminary design and simulation systems for control-structure interaction problems

    Science.gov (United States)

    Park, K. C.; Alvin, Kenneth F.

    1991-01-01

    Software aspects of control-structure interaction (CSI) analysis are discussed. The following subject areas are covered: (1) implementation of a partitioned algorithm for simulation of large CSI problems; (2) second-order discrete Kalman filtering equations for CSI simulations; and (3) parallel computations and control of adaptive structures.

  10. Comparative analysis of controlling urbanization in Slovenia and Sweden

    OpenAIRE

    Parovel, Maja

    2011-01-01

    In the diploma thesis, the legal and institutional framework for monitoring urban growth is analyzed, where urbanization is examined primarily from a spatial perspective. Controlling the expansion of urban areas can be implemented in different ways: through planning acts, various regulations and permits, inspections, active local land policy, such as the purchase or exchange of land, land banks, design of local infrastructure, supervision and regulation of land (parcel) structu...

  11. Analysis of Information Quality in event triggered Smart Grid Control

    DEFF Research Database (Denmark)

    Kristensen, Thomas le Fevre; Olsen, Rasmus Løvenstein; Rasmussen, Jakob Gulddahl

    2015-01-01

    The integration of renewable energy sources into the power grid requires added control intelligence which imposes new communication requirements onto the future power grid. Since large scale implementation of new communication infrastructure is infeasible, we consider methods of increasing dependability of existing networks. We develop models for network delays and information dynamics, and uses these to model information quality for three given information access schemes in an event triggered c...

  12. Analysis of the voltage control capability of energy harvesting networks

    OpenAIRE

    Cuffe, Paul; Smith, Paul; Keane, Andrew

    2010-01-01

    At times of high generation levels from distributed generators (DGs), there may be a paucity of conventional generators still synchronised to the transmission system. These synchronous machines have traditionally been the power system's principal source of controllable reactive power. If DGs are operated at inductive power factors, total reactive power absorption at distribution system bulk supply points may be highest at times when the transmission system is least equipped to supply it. On t...

  13. Economic analysis and randomised controlled trials: an investment appraisal approach

    OpenAIRE

    Backhouse, Martin E.

    2006-01-01

    Randomised controlled trials (RCTs) play a fundamental role in the development and marketing activities of pharmaceutical companies. They are the primary means of evaluating the tolerability, safety and efficacy of a drug, and for providing information relevant for pricing and reimbursement decisions and clinical decision-making. RCTs require a substantial investment by pharmaceutical companies and the financial consequences of poorly or sub-optimally designed trials are potentially substanti...

  14. Component-based analysis of embedded control applications

    DEFF Research Database (Denmark)

    Angelov, Christo K.; Guan, Wei; Marian, Nicolae; Zhou, Feng; Sierszecki, Krzysztof; Top, Søren

    2011-01-01

    The widespread use of embedded systems requires the creation of industrial software technology that will make it possible to engineer systems being correct by construction. That can be achieved through the use of validated (trusted) components, verification of design models, and automatic configuration of applications from validated design models and trusted components. This design philosophy has been instrumental for developing COMDES—a component-based framework for distributed embedded control...

  15. Analysis of the environmental control technology for tar sand development

    Energy Technology Data Exchange (ETDEWEB)

    de Nevers, N.; Glenne, B.; Bryner, C.

    1979-06-01

    The environmental technology for control of air pollution, water pollution, and for the disposal, stabilization, and vegetation of the waste tar sand were thoroughly investigated. Although some difficulties may be encountered in any of these undertakings, it seems clear that the air and water pollution problems can be solved to meet any applicable standard. Currently there are two large-scale plants producing liquid fuels from tar sands in Alberta, Canada which use similar technology involving surface mining, hot water extraction, and surface disposal of waste sand. These projects all meet the Canadian environmental control regulations in force at the time they began. The largest US deposits of tar sands are much smaller than the Canadian; 95 percent are located in the state of Utah. Their economics do not appear as attractive as the Canadian deposits. The environmental control costs are not large enough to make an otherwise economic project uneconomic. The most serious environmental conflict likely to occur over the recovery of liquid fuels from the US deposits of tar sands is that caused by the proximity of the deposits to national parks, national monuments, and a national recreation area in Utah. These areas have very stringent air pollution requirements; and even if the air pollution control requirements can be met, there may still be adequate opposition to large-scale mining ventures in these areas to prevent their commercial exploitation. Another environmental constraint may be water rights availability.Essentially all of the water running in the Colorado river basin is now legally allocated. Barring new interpretations of the legality of water rights purchase, Utah tar sands developments should be able to obtain water by purchasing existing irrigation water rights.

  16. Analysis of Control Strategies for Diode Clamped Multilevel Inverter

    OpenAIRE

    C. R. Balamurugan; S. P. NATARAJAN; R.Revathy

    2013-01-01

    This paper presents the comparison of various Pulse Width Modulation (PWM) strategies for the three phase Diode Clamped Multi Level Inverter (DCMLI). The main contribution of this paper is the proposal of new modulation schemes with Variable Amplitude (VA) and various new schemes adopting the constant switching frequency and also variable switching frequency multicarrier control freedom degree combination concepts are developed and simulated for the chosen three phase DCMLI. The three phase D...

  17. Extreme value analysis for evaluating ozone control strategies

    OpenAIRE

    Reich, Brian; Cooley, Daniel; Foley, Kristen; Napelenok, Sergey; Shaby, Benjamin

    2013-01-01

    Tropospheric ozone is one of six criteria pollutants regulated by the US EPA, and has been linked to respiratory and cardiovascular endpoints and adverse effects on vegetation and ecosystems. Regional photochemical models have been developed to study the impacts of emission reductions on ozone levels. The standard approach is to run the deterministic model under new emission levels and attribute the change in ozone concentration to the emission control strategy. However, run...

  18. REAL TIME ANALYSIS OF WIRELESS CONTROLLER AREA NETWORK

    OpenAIRE

    Gerardine Immaculate Mary; Zachariah C Alex; Lawrence Jenkins

    2014-01-01

    It is widely known that Control Area Networks (CAN) are used in real-time, distributed and parallel processing which cover manufacture plants, humanoid robots, networking fields, etc., In applications where wireless conditions are encountered it is convenient to continue the exchange of CAN frames within the Wireless CAN (WCAN). The WCAN considered in this research is based on wireless token ring protocol (WTRP); a MAC protocol for wireless networks to reduce the number of retransmissions due...

  19. Analysis of Setups of the Control of Rail Microprocessor Systems

    Directory of Open Access Journals (Sweden)

    Zbigniew Lukasik

    2008-01-01

    Full Text Available In the article will have been introduced possibilities following from the application of the microprocessor technology in rail systems of the control of traffic will remain for example of modern signalling on railway crossings. Introduction to microcomputer and microprocessor systems of rail devices will permit to eliminate and to replace disused
    relay devices with them and raising safety on railway and increasing reliability of used devices.

  20. Analysis and Design of Embedded Controlled Parallel Resonant Converter

    OpenAIRE

    Chandrasekhar, P; Sathi Rama REDDY

    2009-01-01

    Microcontroller based constant frequency controlled full bridge LC parallel resonant converter is presented in this paper for electrolyser application. An electrolyser is a part of renewable energy system which generates hydrogen from water electrolysis. The DC power required by the electrolyser system is supplied by the DC-DC converter. Owing to operation under constant frequency, the filter designs are simplified and utilization of magnetic components is improved. This converter has advanta...

  1. Classification Aided Analysis of Oscillatory Signatures in Controlled Retrieval

    OpenAIRE

    Ketz, Nicholas; O'Reilly, Randal C.; CURRAN, TIM

    2013-01-01

    Control processes are critical for both facilitating and suppressing memory retrieval, but these processes are not well understood. The current work, inspired by a similar fMRI design (Detre et al., in press), used a modified Think/No-Think(TNT) paradigm to investigate the neural signatures of volition over enhancing and suppressing memory retrieval. Previous studies have shown memory enhancement when well-learned stimulus pairs are restudied in cued recall (“Recall or think of studied pair i...

  2. Pollution abatement and control expenditure in Romania: A multilevel analysis

    OpenAIRE

    Caporale, Guglielmo Maria; Rault, Christophe; Sova, Robert; Sova, Anamaria

    2010-01-01

    The transition process in Central and Eastern Europe was associated with growing environmental awareness. This paper analyses the determinants of Pollution Abatement and Control Expenditure (PACE) at plant level in the case of Romania using survey data and a Multilevel Regression Model (MRM). Our findings suggest that, although Romania has improved its environmental performance, formal and informal regulation are still only partially developed due to the difficulties of economic transition, a...

  3. Cost analysis of NOx control alternatives for stationary gas turbines

    Energy Technology Data Exchange (ETDEWEB)

    Bill Major

    1999-11-05

    The use of stationary gas turbines for power generation has been growing rapidly with continuing trends predicted well into the future. Factors that are contributing to this growth include advances in turbine technology, operating and siting flexibility and low capital cost. Restructuring of the electric utility industry will provide new opportunities for on-site generation. In a competitive market, it maybe more cost effective to install small distributed generation units (like gas turbines) within the grid rather than constructing large power plants in remote locations with extensive transmission and distribution systems. For the customer, on-site generation will provide added reliability and leverage over the cost of purchased power One of the key issues that is addressed in virtually every gas turbine application is emissions, particularly NO{sub x} emissions. Decades of research and development have significantly reduced the NO{sub x} levels emitted from gas turbines from uncontrolled levels. Emission control technologies are continuing to evolve with older technologies being gradually phased-out while new technologies are being developed and commercialized. The objective of this study is to determine and compare the cost of NO{sub x} control technologies for three size ranges of stationary gas turbines: 5 MW, 25 MW and 150 MW. The purpose of the comparison is to evaluate the cost effectiveness and impact of each control technology as a function of turbine size. The NO{sub x} control technologies evaluated in this study include: Lean premix combustion, also known as dry low NO{sub x} (DLN) combustion; Catalytic combustion; Water/steam injection; Selective catalytic reduction (SCR)--low temperature, conventional, high temperature; and SCONO{sub x}{trademark}.

  4. Analysis Method of Common Cause Failure on Non-safety Digital Control System

    International Nuclear Information System (INIS)

    The effects of common cause failure on safety digital instrumentation and control system had been considered in defense in depth analysis with safety analysis method. However, the effects of common cause failure on non-safety digital instrumentation and control system also should be evaluated. The common cause failure can be included in credible failure on the non-safety system. In the I and C architecture of nuclear power plant, many design feature has been applied for the functional integrity of control system. One of that is segmentation. Segmentation defenses the propagation of faults in the I and C architecture. Some of effects from common cause failure also can be limited by segmentation. Therefore, in this paper there are two type of failure mode, one is failures in one control group which is segmented, and the other is failures in multiple control group because that the segmentation cannot defense all effects from common cause failure. For each type, the worst failure scenario is needed to be determined, so the analysis method has been proposed in this paper. The evaluation can be qualitative when there is sufficient justification that the effects are bounded in previous safety analysis. When it is not bounded in previous safety analysis, additional analysis should be done with conservative assumptions method of previous safety analysis or best estimation method with realistic assumptions

  5. Performance Analysis of Concurrency Control Mechanisms for OLTP Databases

    Directory of Open Access Journals (Sweden)

    Samuel Kaspi

    2014-08-01

    Full Text Available Concurrency control (CC in distributed and multidimensional databases is becoming more important due to recent increase in high-volume data storage with increasing online transaction processing (OLTP requirements for medium and large organisations. This paper examines three concurrency control mechanisms commonly adopted and analyses their performance in distributed databases for OLTP operational systems of enterprises. The three CC mechanisms investigated are, two phase locking (2PL, wait depth limited (WDL and optimistic concurrency control. These CC mechanisms have been studied well in disk-based systems. However, with the recent advances of cost-effective main memory or in-memory storage that can support much higher transaction rates than disk-based systems, there is sufficient motivation to re-investigate the performance of such CC mechanisms in diverse processor configurations. This paper presents a comparison of their behaviour and performance in terms of throughput rates achieved with varying transaction size and contention. The outcome of this study has resulted in further research proposals for improving the performance of these CC mechanisms for OLTP databases.

  6. COST-BENEFIT Analysis in Railway Noise Control

    Science.gov (United States)

    OERTLI, J.

    2000-03-01

    A method to calculate the network-wide costs of realizing different noise control possibilities and their benefits in terms of noise reduction for lineside inhabitants has been implemented in Switzerland. These studies have shown that an optimal cost distribution consists of spending 65% of the available finances on rolling stock improvement, 30% on noise control barriers and 5% on insulated windows. This mix protects 70% of the lineside population for 30% of the cost necessary to attain threshold levels for all inhabitants. This noise control strategy has been accepted by the federal traffic and environment agencies involved and will save billions of Swiss francs. The success of the calculation methodology has prompted development of a Europe-wide decision support system to the same effect. Along two freight freeways the relationship between rolling stock improvement, noise barriers, insulated windows, operational measures and track characteristics is being studied. The decision support system will allow determination of those combinations with the best cost-benefit ratios. The study is currently being undertaken as a joint venture by the railways of Switzerland, France, Germany and the Netherlands as well as the European Rail Research Institute. The results constitute part of the negotiating strategy of the railways with European and national legislators.

  7. Uranium enrichment using gas centrifugation. An analysis focusing export control

    International Nuclear Information System (INIS)

    The Swedish Defence Research Agency, FOI, has performed a study on uranium enrichment by gas centrifugation. The theory and principles of gas centrifugation is described in this report and relevant equipment used in the process has been identified. Different aspects of operating a gas centrifuge facility - and its indicators - are also presented. The separation efficiency and the flow of material through a centrifuge are very small, and therefore, a large number of centrifuges in cascades is needed to produce a larger amount of enriched uranium within a reasonable time. Countries with nuclear weapons ambitions often show an interest in gas centrifuges to produce weapons grade uranium - if they have managed to acquire the technology - because of the efficiency of the process and since it is relatively easy to conceal. Most equipment used in gas centrifuge facilities is under export control to prevent clandestine uranium enrichment. The Nuclear Suppliers' Group has compiled lists of nuclear related equipment and components that are of importance to export control. The control lists have also been included in the EU legislation

  8. Experimental bifurcation analysis of an impact oscillator - Tuning a non-invasive control scheme

    DEFF Research Database (Denmark)

    Bureau, Emil; Schilder, Frank; Santos, Ilmar; Thomsen, Jon Juel; Starke, Jens

    2013-01-01

    We investigate a non-invasive, locally stabilizing control scheme necessary for an experimental bifurcation analysis. Our test-rig comprises a harmonically forced impact oscillator with hardening spring nonlinearity controlled by electromagnetic actuators, and serves as a prototype for electromagnetic bearings and other machinery with build-in actuators. We propose a sequence of experiments that allows one to choose optimal control-gains, filter parameters and settings for a continuation method ...

  9. Development of a Modern Control System Analysis Package Using Visual Basic Programming

    OpenAIRE

    Lee Shu Khan; Mohd Fua’ad Rahmat

    2007-01-01

    This paper introduces a Computer Aided Control System Design (CACSD) program that furnishes a background necessary for studying modern control theory. The program focuses on state-space analysis which performs conversion of a system from state-space representation to transfer function and via versa. Besides, system transformation on different state coordinates, time domain solution, controller design, observer design and steady state error evaluation with interactive graphresponse are also be...

  10. Modelling and Control of a Residential Wind/PV/Battery Hybrid Power System with Performance Analysis

    OpenAIRE

    Antonucci, V.; Ferraro, M; Napoli, G.; A. Yasin

    2011-01-01

    Time domain performance analysis results of a standalone hybrid system are presented based on commercial wind generator, photovoltaic generator and battery energy storage system. The hybrid system is designed and modelled using Matlab/Simulink/SimPowSys environment, a control strategy has been proposed to control the voltage DC bus and the energy flow between the different energy sources. The wind and photovoltaic generators are controlled locally to obtain the maximum power extraction, while...

  11. Alternative Representation of Management Control Design: an empirical exploration and critical analysis

    OpenAIRE

    Jim Rooney

    2013-01-01

    This paper describes a critical analysis of three recently published theoretical frameworks developed to explain management control design within inter-organisational collaborations. The particular concern is that, despite a plethora of theoretical frameworks attempting to explain management control design choices, these frameworks have yet to be utilised in practice. The focus is on their respective ability to explain control change in response to coordination problems, recognisi...

  12. Development of Control Program for Plant Growth Parameter Analysis in Lowland Tropical Greenhouse

    OpenAIRE

    W.I. Wan Ishak; Tan Ming Yin; R. M. Hudzari

    2011-01-01

    The purpose of this project is to develop control system for environment parameter in the lowland tropical greenhouse using Microcontroller. The plant growth analysis covered both inside and outside greenhouse was presented. The controller was used to monitor the temperature, relative humidity and Vapor Pressure Deficit (VPD) in the planting of chili. The study of VPD is to show air moisture conditions for plant production while taking into account different temperature levels. The controller...

  13. Randomized controlled trials of malaria intervention trials in Africa, 1948 to 2007: a descriptive analysis

    OpenAIRE

    Gerritsen Annette; Lutje Vittoria; Siegfried Nandi

    2011-01-01

    Abstract Background Nine out of ten deaths from malaria occur in sub-Saharan Africa. Various control measures have achieved some progress in the control of the disease, but malaria is still a major public health problem in Africa. Randomized controlled trials (RCTs) are universally considered the best study type to rigorously assess whether an intervention is effective. The study reported here provides a descriptive analysis of RCTs reporting interventions for the prevention and treatment of ...

  14. Analysis of the Relationship between Listed Companies’ Earnings Quality and Internal Control Information Disclosure

    OpenAIRE

    Jianfei Leng; Lu Li,

    2011-01-01

    This article examines the relationship of earnings quality and internal control disclosure information in the sample of 1273 nonfinancial firms in shanghai and Shenzhen Stock Exchange in 2010. Using multiple regression model, we launch an empirical analysis on the relationship between earnings quality and internal control disclosure information. We find a positive relation between earnings quality and internal control disclosure information. The better the earnings quality is, the higher leve...

  15. Comparative analysis of traditional and modern controller for piezoelectric actuated nanopositioner

    Directory of Open Access Journals (Sweden)

    Sheilza Aggarwal

    2012-11-01

    Full Text Available Nanopositioning, Precise control and manipulation of devices and materials at nanoscale is the most important constraint of nanotechnology. Nanopositioning stage consisting of piezoelectric actuator has widespread use in applications requiring positioning with precision at nanoscale. In this paper, open loop characteristics of the non minimum phase nanopositioning system are investigated. To guarantee high precision positioning and improvement in the system characteristics demands different types of feedback controllers. The main aim of the controller is to design a closed loop system with good dynamic characteristics and to maintain the desired stability margins. PID controller is a generic closed loop controller widely used for industrial control applications. This paper presents design of PID controller using Ziegler Nichols tuning method. This paper analyzes time and frequency response of traditional PID controller. Non minimum phase system can be stabilized more effectively by modern controller such as pole placement controller, Linear Quadratic Regulator (LQR and H infinity controllers. This paper develops a methodology for the design of full state feedback controller using pole placement and LQR control techniques. Step response and frequency responses under variety of conditions are plotted and analyzed to verify the effectiveness of the proposed controllers. Closed loop system is analyzed in both time and frequency domain for different dynamic characteristics such as rise time, settling time, maximum overshot and stability margins. A comparative assessment based upon the system’s response characteristics of traditional PID controller, pole placement controller and LQR controller is presented. Simulation results for the performance analysis are carried out on MATLAB and demonstrate effectiveness and adaptability of controller for precise control of piezoelectric actuated nanopositioning system.

  16. Continuous Efforts to Develop the National System for Material Control and Accounting Training at the George Kuzmycz Training Center

    Energy Technology Data Exchange (ETDEWEB)

    Gavrilyuk, Victor I.; Kirischuk, Volodymyr; Romanova, Olena; Levina, Elena; Diakov, Oleksii; Drapey, Sergiy; Proskurin, Dmitry; Gavrilyuk-Burakova, Anna

    2011-10-01

    The George Kuzmycz Training Center (GKTC) for Physical Protection, Control and Accounting of Nuclear Materials was established in 1998 at the Kyiv Institute of Nuclear Research of the Ukrainian Academy of Sciences through the collaborative efforts of the United States and Ukraine. Later the European Commission (EC) joined the US in assisting with the Material Control and Accounting (MC&A) part of the GKTC training program. The Government of Ukraine designated the GKTC as the National Center responsible for providing training and methodological support for nuclear facilities and nuclear specialists in the Material Protection, Control and Accounting (MPC&A) area. To increase the efficiency of the State MC&A system an essential number of new regulations, norms and rules have been developed; some of them mandate regular and more intensive training of MC&A specialists in the industry - from those working at the Nuclear Regulatory Authority of Ukraine to the personnel of nuclear facilities. To meet such regulations GKTC plans to develop next year a number of training courses under the EC contract; such courses will reflect both the specifics of Ukrainian nuclear facilities and the level of expertise of the facilities’ personnel. The NDA training laboratory, established in 2003 with US DOE financial support and technical and methodological assistance, considerably expanded the GKTC’s training capabilities for MC&A programs. Next year that lab will be supplemented with a new NM Surveillance and Containment laboratory as current plans call for under the EC contract. The US DOE is also providing funding to support that project. Under the EC contract the laboratory will be equipped with state-of-the-art, advanced surveillance and containment equipment which will strengthen and expand even further the GKTC’s training capabilities and potential. This will allow GKTC to train Ukrainian nuclear industry specialists in practically all MC&A topics. Furthermore, GKTC is planning to offer already this year and to continue offering in the future, on a regular basis, the courses that have already been developed, while continuing to develop new ones. This paper briefly describes the work done to upgrade the Ukrainian MC&A system, both at the State and at the facilities’ levels, as well as the results of efforts to develop the National System for training MC&A personnel at the GKTC. It also describes problems encountered and their solution; it includes comments, suggestions and recommendations for future activities to promote and improve the nuclear material management culture in Ukraine.

  17. Comprehensive Analysis of the Control Strategy for Hybrid Active Power Filter with Injection Circuit

    OpenAIRE

    MinhThuyen Chau; VanBao Chau

    2013-01-01

    This paper proposes an overview of the analysis ofcontrol strategies for Hybrid Active Power Filter with Injection Circuit (IHAPF). This analysis will be the basis ofresearches of the IHAPF in the future. Simulation resultshave shown the effectiveness of the control strategies

  18. Postural control analysis of diabetic individuals through baropodometry

    Directory of Open Access Journals (Sweden)

    Andréa Jeanne Lourenço Nozabieli

    2012-10-01

    Full Text Available Objective of this study was to analyze the postural balance of neuropathic diabetic individuals through baropodometry, related to losses in the sensorimotor system. Twenty-eight healthy and 25 diagnosed with diabetic neuropathy were subjected to static evaluation (measurement of displacement of body center of pressure and dynamic (temporal analysis of the stance phase of gait cycle. The tactile sensitivity of the feet was assessed by Semmes Weinstein monofilaments and isometric muscle strength of ankle dynamometry. Analyses of multivariânvia (MANOVAs and variance (ANOVAs indicated lower performance in tactile sensitivity, muscle strength and dynamic balance, but showed no difference for static equilibrium of diabetic neuropathy. With this study by regression analysis, one can infer that the equilibrium differences in gait of neuropathic insensitivity may result from tactile and muscle strength.

  19. Statistical inference in behavior analysis: Experimental control is better

    OpenAIRE

    Perone, Michael

    1999-01-01

    Statistical inference promises automatic, objective, reliable assessments of data, independent of the skills or biases of the investigator, whereas the single-subject methods favored by behavior analysts often are said to rely too much on the investigator's subjective impressions, particularly in the visual analysis of data. In fact, conventional statistical methods are difficult to apply correctly, even by experts, and the underlying logic of null-hypothesis testing has drawn criticism since...

  20. Analysis and Modeling of Control Tasks in Dynamic Systems

    DEFF Research Database (Denmark)

    Ursem, Rasmus Kjær; Krink, Thiemo; Jensen, Mikkel Thomas; Michalewicz, Zbigniew

    2002-01-01

    Most applications of evolutionary algorithms deal with static optimization problems. However, in recent years, there has been a growing interest in time-varying (dynamic) problems, which are typically found in real-world scenarios. One major challenge in this field is the design of realistic test-case generators (TCGs), which requires a systematic analysis of dynamic optimization tasks. So far, only a few TCGs have been suggested. Our investigation leads to the conclusion that these TCGs are not...

  1. Analysis of the environmental control technology for oil shale development

    Energy Technology Data Exchange (ETDEWEB)

    de Nevers, N.; Eckhoff, D.; Swanson, S.; Glenne, B.; Wagner, F.

    1978-02-01

    The environmental control technology proposed in the various oil shale projects which are under development are examined. The technologies for control of air pollution, water pollution, and for the disposal, stabilization, and vegetation of the processed shale were thoroughly investigated. Although some difficulties may be encountered in any of these undertakings, it seems clear that the air and water pollution problems can be solved to meet any applicable standard. There are no published national standards against which to judge the stabilization and vegetation of the processed shale. However, based on the goal of producing an environmentally and aesthetically acceptable finished processed shale pile, it seems probable that this can be accomplished. It is concluded that the environmental control technology is available to meet all current legal requirements. This was not the case before Colorado changed their applicable Air Pollution regulations in August of 1977; the previous ones for the oil shale region were sufficiently stringent to have caused a problem for the current stage of oil shale development. Similarly, the federal air-quality, non-deterioration regulations could be interpreted in the future in ways which would be difficult for the oil shale industry to comply with. The Utah water-quality, non-deterioration regulations could also be a problem. Thus, the only specific regulations which may be a problem are the non-deterioration parts of air and water quality regulations. The unresolved areas of environmental concern with oil shale processing are mostly for the problems not covered by existing environmental law, e.g., trace metals, polynuclear organics, ground water-quality changes, etc. These may be problems, but no evidence is yet available that these problems will prevent the successful commercialization of oil shale production.

  2. Model-based analysis of context-specific cognitive control

    Directory of Open Access Journals (Sweden)

    JosephA.King

    2012-09-01

    Full Text Available Interference resolution is improved for stimuli presented in contexts (e.g. locations associated with frequent conflict. This phenomenon, the “context-specific proportion congruent” (CSPC effect, has challenged the traditional juxtaposition of “automatic” and “controlled” processing because it suggests that contextual cues can prime top-down control settings in a bottom-up manner. We recently obtained support for this “priming of control” hypothesis with fMRI by showing that CSPC effects are mediated by contextually-cued adjustments in processing selectivity. However, an equally plausible explanation is that CSPC effects reflect adjustments in response caution triggered by expectancy violations (i.e. prediction errors when encountering rare events as compared to common ones (e.g. high-conflict incongruent trials in a task context associated with infrequent conflict. Here, we applied a quantitative model of choice, the linear ballistic accumulator (LBA, to distil the reaction time and accuracy data from four independent samples that performed a modified flanker task into latent variables representing the psychological processes underlying task-related decision making. We contrasted models which differentially accounted for CSPC effects as arising either from contextually-cued shifts in the rate of sensory evidence accumulation (“drift” models or in the amount of evidence required to reach a decision (“threshold” models. For the majority of the participants, the LBA ascribed CSPC effects to increases in response threshold for contextually-infrequent trial types (e.g. low-conflict congruent trials in the frequent conflict context, suggesting that the phenomenon may reflect more a prediction error-triggered shift in decision criterion rather than enhanced sensory evidence accumulation under conditions of frequent conflict.

  3. Advanced electric drives analysis, control, and modeling using MATLAB/Simulink

    CERN Document Server

    Mohan, Ned

    2014-01-01

    Advanced Electric Drives utilizes a physics-based approach to explain the fundamental concepts of modern electric drive control and its operation under dynamic conditions. Gives readers a "physical" picture of electric machines and drives without resorting to mathematical transformations for easy visualization Confirms the physics-based analysis of electric drives mathematically Provides readers with an analysis of electric machines in a way that can be easily interfaced to common power electronic converters and controlled using any control scheme Makes the MATLAB/Simulink files used in exampl

  4. Airport and highway noise control, planning and analysis

    Science.gov (United States)

    Harris, R. A.; Hendriks, R. W.; Hatano, M.; Douglass, R. D.; Drinkwater, J. K.; Billera, D. J.; Cunningham, B. C.; Brittle, C.; Broeg, W.; Haberle, G. F.

    Areas addressed are as follows: determination of effectiveness of noise barriers along I-285, Atlanta; evaluation of noise barriers; transparent noise barriers along I-95 in Baltimore City, Maryland; NJ-18 Freeway and Rutgers University classrooms -- unique construction noise mitigation experience; role of airport noise allocations in a regional airport system; comparison of irritation caused by noise generated by road traffic and aviation traffic; enhancement of highway noise modeling through computer graphics; highway construction noise modeling; and noise control through land use planning -- the Calgary case.

  5. Energy Analysis of Pid Controlled Heat Pump Dryer

    OpenAIRE

    Ilhan CEYLAN

    2009-01-01

    In this experimental study, a heat pump dryer was designed and manufactured, in which drying air temperature was controlled PID. Manufactured heat pump dryer was tested in drying kiwi, avocado and banana from among tropical fruits and energy and exergy analyses were made. Drying air temperature changed between 40 oC - 40.2 oC while drying the tropical fruits. Before the drying process in heat pump dryer, initial moisture contents were determined as 4.31 g water / g dry matter for kiwi, 1.51 g...

  6. Analysis and Design of Embedded Controlled Parallel Resonant Converter

    Directory of Open Access Journals (Sweden)

    P. CHANDRASEKHAR

    2009-07-01

    Full Text Available Microcontroller based constant frequency controlled full bridge LC parallel resonant converter is presented in this paper for electrolyser application. An electrolyser is a part of renewable energy system which generates hydrogen from water electrolysis. The DC power required by the electrolyser system is supplied by the DC-DC converter. Owing to operation under constant frequency, the filter designs are simplified and utilization of magnetic components is improved. This converter has advantages like high power density, low EMI and reduced switching stresses. DC-DC converter system is simulated using MATLAB, Simulink. Detailed simulation results are presented. The simulation results are compared with the experimental results.

  7. Quality control of clinker products by SEM and XRF analysis

    International Nuclear Information System (INIS)

    The microstructure and chemical properties of industrial Portland cement clinkers have been examined by SEM and XRF methods to establish the nature of the clinkers and how variations in the clinker characteristics can be used to control the clinker quality. The clinker nodules were found to show differences in the chemical composition and microstructure between the inner and outer parts of the clinker nodules. Microstructure studies of industrial Portland cement clinker have shown that the outer part of the nodules are enriched in silicate more than the inner part. There is better crystallization and larger alite crystal size in the outer part than in the inner part. The alite crystal size varied between 16.2 -46.12 ? m. The clinker chemical composition was found to affect the residual >45 ? m, where a higher belite content causes an increase in the residual >45 ? m in the the cement product and will cause a decrease in the concrete strength of the cement product. The aluminate and ferrite crystals and the microcracks within the alite crystal are clear in some clinker only. The quality of the raw material preparation, burning and cooling stages can be controlled using the microstructure of the clinker product

  8. A study on deformable mirrors control and error analysis

    Science.gov (United States)

    Li, Heng; Cheng, Xuemin; Hao, Qun; Fan, Fan

    2015-08-01

    A four-group stabilized zoom lens design of two focal-length-variable elements was discussed in our early work. The focal-length of the zoom system could be adjusted by tuning the surface shape of focal-length-variable element. In this paper, we propose to use the deformable mirror (DM) as the focal-length-variable device, and then we need to control the DM to forming the required surface shape and analyze the errors between actual surface and theoretic surface. This lays the foundation for analyzing the focusing zoom errors of the stabilized zoom lens in the zoom process. This paper firstly introduces a DM flatten method applied for using OKO Technologies' Piezoelectric Deformable Mirror (PDM) and analyzes the high order errors of flattened surface with the help of ZYGO interferometer. Then we study the method of DM control to form sphere surfaces with different curvature. The analyses of the high order error of the actual surface and the measurement of the curvature range of the sphere surface are also included in this paper.

  9. Factors Controlling Nanoparticle Pharmacokinetics: An Integrated Analysis and Perspective

    DEFF Research Database (Denmark)

    Moghimi, Seyed Moien; Hunter, A.C.

    2012-01-01

    Intravenously injected nanoparticulate drug carriers provide a wide range of unique opportunities for site-specific targeting of therapeutic agents to many areas within the vasculature and beyond. Pharmacokinetics and biodistribution of these carriers are controlled by a complex array of interrelated core and interfacial physicochemical and biological factors. Pertinent to realizing therapeutic goals, definitive maps that establish the interdependency of nanoparticle size, shape, and surface characteristics in relation to interfacial forces, biodistribution, controlled drug release, excretion, and adverse effects must be outlined. These concepts are critically evaluated and an integrated perspective is provided on the basis of the recent application of nanoscience approaches to nanocarrier design and engineering. The future of this exciting field is bright; some regulatory-approved products are already on the market and many are in late-phase clinical trials. With concomitant advances in extensive computational knowledge of the genomics and epigenomics of interindividual variations in drug responses, the boundaries toward development of personalized nanomedicines can be pushed further.

  10. Flow Control Analysis on the Hump Model with RANS Tools

    Science.gov (United States)

    Viken, Sally A.; Vatsa, Veer N.; Rumsey, Christopher L.; Carpenter, Mark H.

    2003-01-01

    A concerted effort is underway at NASA Langley Research Center to create a benchmark for Computational Fluid Dynamic (CFD) codes. both unstructured and structured, against a data set for the hump model with actuation. The hump model was tested in the NASA Langley 0.3-m Transonic Cryogenic Tunnel. The CFD codes used for the analyses are the FUN2D (Full Unstructured Navier-Stokes 2-Dimensional) code, the structured TLNS3D (Thin-Layer Navier-Stokes 3-Dimensional) code, and the structured CFL3D code, all developed at NASA Langley. The current investigation uses the time-accurate Reynolds-Averaged Navier-Stokes (RANS) approach to predict aerodynamic performance of the active flow control experimental database for the hump model. Two-dimensional computational results verified that steady blowing and suction and oscillatory suction/blowing can be used to significantly reduce the separated flow region on the model. Discrepancies do exist between the CFD results and experimental data in the region downstream of the slot with the largest differences in the oscillatory cases. Overall, the structured CFD codes exhibited similar behavior with each other for a wide range of control conditions, with the unstructured FUN2D code showing moderately different results in the separated flow region for the suction and oscillatory cases.

  11. Statistical analysis of quality control of automatic processor

    International Nuclear Information System (INIS)

    Objective: To strengthen the scientific management of automatic processor and promote QC, based on analyzing QC management chart for automatic processor by statistical method, evaluating and interpreting the data and trend of the chart. Method: Speed, contrast, minimum density of step wedge of film strip were measured everyday and recorded on the QC chart. Mean (x-bar), standard deviation (s) and range (R) were calculated. The data and the working trend were evaluated and interpreted for management decisions. Results: Using relative frequency distribution curve constructed by measured data, the authors can judge whether it is a symmetric bell-shaped curve or not. If not, it indicates a few extremes overstepping control limits possibly are pulling the curve to the left or right. If it is a normal distribution, standard deviation (s) is observed. When x-bar +- 2s lies in upper and lower control limits of relative performance indexes, it indicates the processor works in stable status in this period. Conclusion: Guided by statistical method, QC work becomes more scientific and quantified. The authors can deepen understanding and application of the trend chart, and improve the quality management to a new step

  12. Impedance Based Analysis and Design of Harmonic Resonant Controller for a Wide Range of Grid Impedance

    DEFF Research Database (Denmark)

    Kwon, JunBum; Wang, Xiongfei

    2014-01-01

    This paper investigates the effect of grid impedance variation on harmonic resonant current controllers for gridconnected voltage source converters by means of impedance-based analysis. It reveals that the negative harmonic resistances tend to be derived from harmonic resonant controllers in the closed-loop output admittance of converter. Such negative resistances may interact with the grid impedance resulting in steady state error or unstable harmonic compensation. To deal with this problem, a design guideline for harmonic resonant controllers under a wide range of grid impedance is proposed, where the controller gain boundary region is derived based on the short circuit ratio. The nonlinear time domain simulations are presented to verify the theoretical analysis in the frequency domain, and the experimental results based on the analysis results are included.

  13. CONTROL AND STABILITY ANALYSIS OF THE GMC ALGORITHM APPLIED TO pH SYSTEMS

    Scientific Electronic Library Online (English)

    J.T., Manzi; D., Odloak.

    1998-09-01

    Full Text Available This paper deals with the control of the neutralization processes of the strong acid-strong base and the weak acid-strong base systems using the Generic Model Control (GMC) algorithm. The control strategy is applied to a pilot plant where hydrochloric acid-sodium hydroxide and acetic acid-sodium hyd [...] roxide systems are neutralized. The GMC algorithm includes in the controller structure a nonlinear model of the process in the controller structure. The paper also focuses the provides a stability analysis of the controller for some of the uncertainties involved in the system. The rResults indicate that the controller stabilizes the system for a large range of uncertainties, but the performance may deteriorate when the system is submitted to large disturbances.

  14. Radial basis function (RBF) neural network control for mechanical systems design, analysis and Matlab simulation

    CERN Document Server

    Liu, Jinkun

    2013-01-01

    Radial Basis Function (RBF) Neural Network Control for Mechanical Systems is motivated by the need for systematic design approaches to stable adaptive control system design using neural network approximation-based techniques. The main objectives of the book are to introduce the concrete design methods and MATLAB simulation of stable adaptive RBF neural control strategies. In this book, a broad range of implementable neural network control design methods for mechanical systems are presented, such as robot manipulators, inverted pendulums, single link flexible joint robots, motors, etc. Advanced neural network controller design methods and their stability analysis are explored. The book provides readers with the fundamentals of neural network control system design.   This book is intended for the researchers in the fields of neural adaptive control, mechanical systems, Matlab simulation, engineering design, robotics and automation. Jinkun Liu is a professor at Beijing University of Aeronautics and Astronauti...

  15. Quality control in metal scrap sorting and finish product analysis

    International Nuclear Information System (INIS)

    Energy Dispersive X-Ray Fluorescence (EDXRF) analysis was used to partially determine the intensity ratios of various elements in the different grades of scrap metal. Various intensity rations such as Sn/Ag, Cr/Mn, Fe/Pb, Fe/Cu, Fe/Cr and Fe/Mn were investigated as possible means for sorting scrap metals. The results from laboratory based EDXRF system and Field portable system are also compared. From the results obtained, the Fe/Mn ratio gives the most consistent value, and is the ratio that is being recommended for scrap metal sorting (author)

  16. Quality control in metal scrap sorting and finished product analysis

    International Nuclear Information System (INIS)

    Energy dispersive X ray fluorescence (EDXRF) analysis, conventional and field portable system, was used to partially determine the intensity ratios of various elements in different grades of scrap metal. Various intensity ratios such as Sn/Ag, Cr/Mn, Fe/Pb, Fe/Cu, Fe/Cr and Fe/Mn were investigated as possible means for sorting scrap metals. From the results obtained, the Fe/Mn ratio gives the most consistent value, and the one being recommended for used in scrap metal sorting. (author)

  17. Control Volume Analysis, Entropy Balance and the Entropy Production in Flow Systems

    CERN Document Server

    Niven, Robert K

    2014-01-01

    This chapter concerns "control volume analysis", the standard engineering tool for the analysis of flow systems, and its application to entropy balance calculations. Firstly, the principles of control volume analysis are enunciated and applied to flows of conserved quantities (e.g. mass, momentum, energy) through a control volume, giving integral (Reynolds transport theorem) and differential forms of the conservation equations. Several definitions of steady state are discussed. The concept of "entropy" is then established using Jaynes' maximum entropy method, both in general and in equilibrium thermodynamics. The thermodynamic entropy then gives the "entropy production" concept. Equations for the entropy production are then derived for simple, integral and infinitesimal flow systems. Some technical aspects are examined, including discrete and continuum representations of volume elements, the effect of radiation, and the analysis of systems subdivided into compartments. A Reynolds decomposition of the entropy ...

  18. Análisis de orina: estandarización y control de calidad / Urine analysis: standardization and quality control / Análise de urina: padronização e controle de qualidade

    Scientific Electronic Library Online (English)

    Diego Javier, Fernández; Sofía, Di Chiazza; Fernando Pedro, Veyretou; Liliana Mónica, González; , Romero.

    2014-06-01

    Full Text Available O exame de urina completa data dos tempos de Hipócrates. Atualmente é baseado no uso de tiras-teste e a visualização no microscópio, carecendo de uma padronização atualizada e controle de qualidade. No presente trabalho foi realizado um estudo comparativo entre observadores padronizando o processo e [...] elaborando uma solução de controle juntamente com uma coleção de fotografias do sedimento para ensino, treinamento e controle interno. 200 amostras de urinas de pacientes selecionados aleatoriamente foram avaliadas. Os parâmetros físico-químicos foram determinados em um equipamento Urisys 2400 (Roche). A análise microscópica foi realizada por dois operadores experientes. Foi realizada uma solução controle positiva dos parâmetros usuais de tiras-teste. Os resultados foram analisados através do teste Kappa, p Abstract in spanish El examen de orina completa data de los tiempos de Hipócrates. En la actualidad se basa en la utilización de tiras reactivas y la visualización al microscopio, careciendo de una estandarización actualizada y control de calidad. En el presente trabajo se realizó un estudio comparativo entre observado [...] res, estandarizando el proceso y elaborando una solución control junto con una colección fotográfica del sedimento para enseñanza, entrenamiento y control interno. Se evaluaron 200 muestras de orinas de pacientes al azar. Los parámetros fisicoquímicos se determinaron en un equipo Urisys 2400 (Roche). El análisis microscópico fue realizado por dos operadores experimentados. Se preparó una solución control positiva de los parámetros usuales de tiras reactivas. Los resultados fueron analizados mediante el test Kappa, p Abstract in english Urine analysis is one of the most ancient tests. It dates back from Hyppocrates times. Nowadays it is based on the use of reactive dipsticks and visual examinations in the microscope, with no quality control or adjusted standardization. In the present work, a standardized procedure, a positive contr [...] ol solution for dipsticks and a photographic collection of urine sediment were performed for teaching, training and control of the laboratory staff. Urisys 2400 (ROCHE) was used to analyze 200 samples randomly. The microscopic analysis was made by two experienced operators. A positive control solution of usual parameters of reactive dipsticks was performed. Data analysis was fulfilled by Kappa test p

  19. Multi-dimensional project evaluation: Combining cost-benefit analysis and multi-criteria analysis with the COSIMA software system

    DEFF Research Database (Denmark)

    2008-01-01

    This paper proposes a methodology that integrates quantitative and qualitative assessment. The methodology proposed combines conventional cost-benefit analysis (CBA) with multi-criteria analysis (MCA). The CBA methodology, based on welfare theory, assures that the project with the highest welfare for society is ranked uppermost. To compare the different impacts, it is necessary to have a common monetary unit. Theoretically, all benefits and all costs should be accounted for in socio-economic cos...

  20. Analysis of Power Converter Losses in Vector Control System of a Self-Excited Induction Generator

    Science.gov (United States)

    Baši?, Mateo; Vukadinovi?, Dinko; Poli?, Miljenko

    2014-03-01

    This paper provides analysis of losses in the hysteresis-driven three-phase power converter with IGBTs and free-wheeling diodes. The converter under consideration is part of the self-excited induction generator (SEIG) vector control system. For the analysis, the SEIG vector control system is used in which the induction generator iron losses are taken into account. The power converter losses are determined by using a suitable loss estimation algorithm reported in literature. The chosen algorithm allows the power converter losses to be determined both by type (switching/conduction losses) and by converter component (IGBT/diode losses). The overall power converter losses are determined over wide ranges of rotor speed, dc-link voltage and load resistance, and subsequently used for offline correction of the overall control system's losses (efficiency) obtained through control system simulations with an ideal power converter. The control system's efficiency values obtained after the correction are compared with the measured values.

  1. Time series modeling for analysis and control advanced autopilot and monitoring systems

    CERN Document Server

    Ohtsu, Kohei; Kitagawa, Genshiro

    2015-01-01

    This book presents multivariate time series methods for the analysis and optimal control of feedback systems. Although ships’ autopilot systems are considered through the entire book, the methods set forth in this book can be applied to many other complicated, large, or noisy feedback control systems for which it is difficult to derive a model of the entire system based on theory in that subject area. The basic models used in this method are the multivariate autoregressive model with exogenous variables (ARX) model and the radial bases function net-type coefficients ARX model. The noise contribution analysis can then be performed through the estimated autoregressive (AR) model and various types of autopilot systems can be designed through the state–space representation of the models. The marine autopilot systems addressed in this book include optimal controllers for course-keeping motion, rolling reduction controllers with rudder motion, engine governor controllers, noise adaptive autopilots, route-tracki...

  2. Analysis and control of complex dynamical systems robust bifurcation, dynamic attractors, and network complexity

    CERN Document Server

    Imura, Jun-ichi; Ueta, Tetsushi

    2015-01-01

    This book is the first to report on theoretical breakthroughs on control of complex dynamical systems developed by collaborative researchers in the two fields of dynamical systems theory and control theory. As well, its basic point of view is of three kinds of complexity: bifurcation phenomena subject to model uncertainty, complex behavior including periodic/quasi-periodic orbits as well as chaotic orbits, and network complexity emerging from dynamical interactions between subsystems. Analysis and Control of Complex Dynamical Systems offers a valuable resource for mathematicians, physicists, and biophysicists, as well as for researchers in nonlinear science and control engineering, allowing them to develop a better fundamental understanding of the analysis and control synthesis of such complex systems.

  3. A Signal Transmission Technique for Stability Analysis of Multivariable Non-Linear Control Systems

    Science.gov (United States)

    Jackson, Mark; Zimpfer, Doug; Adams, Neil; Lindsey, K. L. (Technical Monitor)

    2000-01-01

    Among the difficulties associated with multivariable, non-linear control systems is the problem of assessing closed-loop stability. Of particular interest is the class of non-linear systems controlled with on/off actuators, such as spacecraft thrusters or electrical relays. With such systems, standard describing function techniques are typically too conservative, and time-domain simulation analysis is prohibitively extensive, This paper presents an open-loop analysis technique for this class of non-linear systems. The technique is centered around an innovative use of multivariable signal transmission theory to quantify the plant response to worst case control commands. The technique has been applied to assess stability of thruster controlled flexible space structures. Examples are provided for Space Shuttle attitude control with attached flexible payloads.

  4. Continuous quality control of analytical results from neutron activation analysis of air filter samples based on the analysis of precision

    International Nuclear Information System (INIS)

    The determination of vanadium in air filter samples by instrumental neutron activation analysis has been carried out on a routine basis for several years. Identification of all sources of variation in the analytical procedure has made possible a reduction of the priori error to insignificance compared with counting statistics. The precision of a single result is therefore calculated from the assumed Poisson distribution of counting data. By analysing 10-15% of the samples in duplicate, the quality of the results may be controlled by the Analysis of Precision, which tests the agreement between observed and calculated precision by means of the statistic T with reference to a chi2-distribution. Continuous control of blanks and comparator standards is performed in a similar way. The power of the quality control system has been demonstrated by the detection of gross errors or mistakes, but also by the early warning of a gradual decline of stability of the counting equipment. Significant losses during normal handling of membrane filters were also detected, and these samples must be kept sealed during the whole analysis. The quality control of blanks, finally, justified the replacement of a single blank value by the mean value of all blanks, so that blank corrections do not reduce the precision of individual results. On the whole, the value of the quality control system has proved significantly greater than the additional efforts it involves. (author)

  5. A thermoeconomic analysis of a commercial aircraft environmental control system

    Energy Technology Data Exchange (ETDEWEB)

    Leo, Teresa J.; Perez-Grande, Isabel [Universidad Politecnica de Madrid, Dept. Motopropulsion y Termofluidodinamica, Madrid (Spain)

    2005-02-01

    In this work a particular application of thermoeconomics to aeronautics is performed. The cost balance has been applied to the environmental control system (ECS) of an aircraft as a component and the cost per unit of exergy of the conditioning stream entering the cabin has been obtained for a range of the aircraft engine bleed pressure values. A minimum cost has been found at a pressure close to the nominal bleed pressure. The thermoeconomic data used here to obtain the results are real ones from actual devices. In the model proposed here the operating costs are due mainly to the fact that it is necessary to transport the system. This is a special feature of aircraft systems that makes them different from other thermal devices. The exergoeconomic factors obtained are very high compared with the usual ones obtained for other types of thermal systems (Author)

  6. Mission control of multiple unmanned aerial vehicles: a workload analysis.

    Science.gov (United States)

    Dixon, Stephen R; Wickens, Christopher D; Chang, Dervon

    2005-01-01

    With unmanned aerial vehicles (UAVs), 36 licensed pilots flew both single-UAV and dual-UAV simulated military missions. Pilots were required to navigate each UAV through a series of mission legs in one of the following three conditions: a baseline condition, an auditory autoalert condition, and an autopilot condition. Pilots were responsible for (a) mission completion, (b) target search, and (c) systems monitoring. Results revealed that both the autoalert and the autopilot automation improved overall performance by reducing task interference and alleviating workload. The autoalert system benefited performance both in the automated task and mission completion task, whereas the autopilot system benefited performance in the automated task, the mission completion task, and the target search task. Practical implications for the study include the suggestion that reliable automation can help alleviate task interference and reduce workload, thereby allowing pilots to better handle concurrent tasks during single- and multiple-UAV flight control. PMID:16435690

  7. Redundant single gimbal control moment gyroscope singularity analysis

    Science.gov (United States)

    Bedrossian, Nazareth S.; Paradiso, Joseph; Bergmann, Edward V.; Rowell, Derek

    1990-01-01

    The robotic manipulator is proposed as the mechanical analog to single gimbal control moment gyroscope systems, and it is shown that both systems share similar difficulties with singular configurations. This analogy is used to group gimbal angles corresponding to any momentum state into different families. The singularity problem associated with these systems is examined in detail. In particular, a method is presented to test for the possibility of nontorque-producing gimbal motion at a singular configuration, as well as to determine the admissible motions in the case when this is possible. Sufficient conditions are derived for instances where the singular system can be reconfigured into a nonsingular state by these nontorque-producing motions.

  8. Control Design and Performance Analysis for Autonomous Formation Flight Experimentss

    Science.gov (United States)

    Rice, Caleb Michael

    Autonomous Formation Flight is a key approach for reducing greenhouse gas emissions and managing traffic in future high density airspace. Unmanned Aerial Vehicles (UAV's) have made it possible for the physical demonstration and validation of autonomous formation flight concepts inexpensively and eliminates the flight risk to human pilots. This thesis discusses the design, implementation, and flight testing of three different formation flight control methods, Proportional Integral and Derivative (PID); Fuzzy Logic (FL); and NonLinear Dynamic Inversion (NLDI), and their respective performance behavior. Experimental results show achievable autonomous formation flight and performance quality with a pair of low-cost unmanned research fixed wing aircraft and also with a solo vertical takeoff and landing (VTOL) quadrotor.

  9. Integration of management control tools. Analysis of a case study

    Directory of Open Access Journals (Sweden)

    Raúl Comas Rodríguez

    2015-09-01

    Full Text Available The objective of this article is to design and to implement a procedure that integrates management control tools focusing on process, to improve the efficiency and the efficacy. It was carried out an experimental study where is defined a procedure, based in the Balanced Scorecard, which integrates the process management into the strategic planning and their evaluation. As results of this work, we define the key factors of success associated with the four perspectives of the Balanced Scorecard that are linked through the cause-effect relations obtaining the strategic map that allows visualizing and communicating the enterprise strategy. The indicators evaluate the key factor of success, integrating the process with the assistance of a software. The implementation of the procedure in a commercialization enterprise contributed to integrate the process definition into the strategic planning. The alignment was evaluated and the efficiency and efficacy indicators improved the company´s performance.

  10. Control analysis of the tunable phononic crystal with electrorheological material

    International Nuclear Information System (INIS)

    The elastic band structure of a two-dimensional phononic crystal (PC) with electrorheological (ER) material is investigated and the plane-wave-expansion (PWE) method is adopted to solve the problem in this paper. The ER material is used to act as a tunable elastic composite inserts and its material parameter can be changed by the applied electric fields. Variations of the band gaps for the phononic composite system are also calculated with various electric fields and it is found to have a significant effect on the band gaps of the phononic system with ER material inserts. The band gaps of the smart system can be controlled and the acoustic characteristics of the system are also changed by applied different electric fields

  11. CONTROL SYSTEM ANALYSIS FOR THE PERTURBED LINEAR ACCELERATOR RF SYSTEM

    International Nuclear Information System (INIS)

    This paper addresses the modeling problem of the linear accelerator RF system in SNS. Klystrons are modeled as linear parameter varying systems. The effect of the high voltage power supply ripple on the klystron output voltage and the output phase is modeled as an additive disturbance. The cavity is modeled as a linear system and the beam current is modeled as the exogenous disturbance. The output uncertainty of the low level RF system which results from the uncertainties in the RF components and cabling is modeled as multiplicative uncertainty. Also, the feedback loop uncertainty and digital signal processing signal conditioning subsystem uncertainties are lumped together and are modeled as multiplicative uncertainty. Finally, the time delays in the loop are modeled as a lumped time delay. For the perturbed open loop system, the closed loop system performance, and stability are analyzed with the PI feedback controller

  12. Analysis and Control of Beliefs in Social Networks

    CERN Document Server

    Wang, Tian; Viniotis, Yannis

    2014-01-01

    In this paper, we investigate the problem of how beliefs diffuse among members of social networks. We propose an information flow model (IFM) of belief that captures how interactions among members affect the diffusion and eventual convergence of a belief. The IFM model includes a generalized Markov Graph (GMG) model as a social network model, which reveals that the diffusion of beliefs depends heavily on two characteristics of the social network characteristics, namely degree centralities and clustering coefficients. We apply the IFM to both converged belief estimation and belief control strategy optimization. The model is compared with an IFM including the Barabasi-Albert model, and is evaluated via experiments with published real social network data.

  13. Analysis of illegal peptide biopharmaceuticals frequently encountered by controlling agencies.

    Science.gov (United States)

    Vanhee, Celine; Janvier, Steven; Desmedt, Bart; Moens, Goedele; Deconinck, Eric; De Beer, Jacques O; Courselle, Patricia

    2015-09-01

    Recent advances in genomics, recombinant expression technologies and peptide synthesis have led to an increased development of protein and peptide therapeutics. Unfortunately this goes hand in hand with a growing market of counterfeit and illegal biopharmaceuticals, including substances that are still under pre-clinical and clinical development. These counterfeit and illegal protein and peptide substances could imply severe health threats as has been demonstrated by numerous case reports. The Belgian Federal Agency for Medicines and Health Products (FAMHP) and customs are striving, together with their global counterparts, to curtail the trafficking and distributions of these substances. At their request, suspected protein and peptide preparations are analysed in our Official Medicines Control Laboratory (OMCL). It stands to reason that a general screening method would be beneficiary in the battle against counterfeit and illegal peptide drugs. In this paper we present such general screening method employing liquid chromatography-tandem mass spectrometry (LC-MS/MS) for the identification of counterfeit and illegal injectable peptide preparations, extended with a subsequent quantification method using ultra-high performance liquid chromatography with diode array detection (UHPLC-DAD). The screening method, taking only 30 min, is able to selectively detect 25 different peptides and incorporates the proposed minimum of five identification points (IP) as has been recommended for sports drug testing applications. The group of peptides represent substances which have already been detected in illegal and counterfeit products seized by different European countries as well as some biopharmaceutical peptides which have not been confiscated yet by the controlling agencies, but are already being used according to the many internet users forums. Additionally, we also show that when applying the same LC gradient, it is also possible to quantify these peptides without the need for derivatization or the use of expensive labelled peptides. This quantification method was successfully validated for a representative subset of 10 different peptides by using the "total error" approach in accordance with the validation requirements of ISO-17025. PMID:26003685

  14. Analysis, testing, and operation of the MAGI thermal control system

    Energy Technology Data Exchange (ETDEWEB)

    Yi, Sonny; Hall, Jeffrey L.; Kasper, Brian P. [The Aerospace Corporation, El Segundo, CA 90245 (United States)

    2014-01-29

    The Aerospace Corporation has completed the development of the Mineral and Gas Identifier (MAGI) sensor - an airborne multi-spectral infrared instrument that is designed to discriminate surface composition and to detect gas emissions from the environment. Sensor performance was demonstrated in a series of flights aboard a Twin Otter aircraft in December 2011 as a stepping stone to a future satellite sensor design. To meet sensor performance requirements the thermal control system was designed to operate the HgCdTe focal plane array (FPA) at 50 K with a 1.79 W heat rejection load to a 44.7 K sink and the optical assembly at 100 K with a 7.5 W heat load to a 82.3 K sink. Two commercial off-theshelf (COTS) Sunpower Stirling cryocoolers were used to meet the instrument’s cooling requirements. A thermal model constructed in Thermal Desktop was used to run parametric studies that guided the mechanical design and sized the two cryocoolers. This paper discusses the development, validation, and operation of the MAGI thermal control system. Detailed energy balances and temperature predictions are presented for various test cases to demonstrate the utility and accuracy of the thermal model. Model inputs included measured values of heat lift as a function of input power and cold tip temperature for the two cryocoolers. These measurements were also used to make predictions of the cool-down behavior from ambient conditions. Advanced heater software was developed to meet unique requirements for both sensor cool-down rate and stability at the set point temperatures.

  15. Analysis, testing, and operation of the MAGI thermal control system

    International Nuclear Information System (INIS)

    The Aerospace Corporation has completed the development of the Mineral and Gas Identifier (MAGI) sensor - an airborne multi-spectral infrared instrument that is designed to discriminate surface composition and to detect gas emissions from the environment. Sensor performance was demonstrated in a series of flights aboard a Twin Otter aircraft in December 2011 as a stepping stone to a future satellite sensor design. To meet sensor performance requirements the thermal control system was designed to operate the HgCdTe focal plane array (FPA) at 50 K with a 1.79 W heat rejection load to a 44.7 K sink and the optical assembly at 100 K with a 7.5 W heat load to a 82.3 K sink. Two commercial off-theshelf (COTS) Sunpower Stirling cryocoolers were used to meet the instrument’s cooling requirements. A thermal model constructed in Thermal Desktop was used to run parametric studies that guided the mechanical design and sized the two cryocoolers. This paper discusses the development, validation, and operation of the MAGI thermal control system. Detailed energy balances and temperature predictions are presented for various test cases to demonstrate the utility and accuracy of the thermal model. Model inputs included measured values of heat lift as a function of input power and cold tip temperature for the two cryocoolers. These measurements were also used to make predictions of the cool-down behavior from ambient conditions. Advanced heater software was developed to meet unique requirements for both sensor cool-down rate and stability at the set point temperatures

  16. Nonlinear dynamic analysis of 2-DOF nonlinear vibration isolation floating raft systems with feedback control

    International Nuclear Information System (INIS)

    In this paper, the average method is adopted to analysis dynamic characteristics of nonlinear vibration isolation floating raft system with feedback control. The analytic results show that the purposes of reducing amplitude of oscillation and complicating the motion can be achieved by adjusting properly the system parameters, exciting frequency and control gain. The conclusions can provide some available evidences for the design and improvement of both the passive and active control of the vibration isolation systems. By altering the exciting frequency and control gain, complex motion of the system can be obtained. Numerical simulations show the system exhibits period vibration, double period vibration and quasi-period motion.

  17. Extracting quantum dynamics from genetic learning algorithms through principal control analysis

    International Nuclear Information System (INIS)

    Genetic learning algorithms are widely used to control ultrafast optical pulse shapes for photo-induced quantum control of atoms and molecules. An unresolved issue is how to use the solutions found by these algorithms to learn about the system's quantum dynamics. We propose a simple method based on covariance analysis of the control space, which can reveal the degrees of freedom in the effective control Hamiltonian. We have applied this technique to stimulated Raman scattering in liquid methanol. A simple model of two-mode stimulated Raman scattering is consistent with the results. (letter to the editor)

  18. A sensitivity analysis approach to control of manipulators with unknown load

    International Nuclear Information System (INIS)

    This paper presents a straightforward control strategy applied to an N-link manipulator holding an unknown load and driving its end effector along a prespecified trajectory. The control is constituted into two primary components. The non-adaptive component is derived from the inverse problem technique while the adaptive component is computed via the application of sensitivity analysis applied to the complete, centralized dynamic model of the manipulator. The result is a robust adaptive controller which tunes its parameters at specified time instants and can withstand all expected variations of the payload. The control synthesis is illustrated by simulations in a 2-link planar manipulator holding an unknown load

  19. A Comparative Analysis of Integrated Boost Flyback Converter using PID and Fuzzy Controller

    Directory of Open Access Journals (Sweden)

    R.Samuel Rajesh Babu

    2015-02-01

    Full Text Available This paper presents a comparative analysis of Integrated boost flyback converter for Renewable energy System. IBFC is the combination of boost converter and fly back converter. The proposed converter is simulated in open and closed loop using PID and FUZZY controller. The Fuzzy Logic Controller (FLC is used reduce the rise time, settling time to almost negligible and try to remove the delay time and inverted response. The performance of IBFC with fuzzy logic controller  is found better instead of PID controller. The simulation results are verified experimentally and  the output of converter is free from ripples and has regulated output voltage.

  20. Bearing defect signature analysis using advanced nonlinear signal analysis in a controlled environment

    Science.gov (United States)

    Zoladz, T.; Earhart, E.; Fiorucci, T.

    1995-01-01

    Utilizing high-frequency data from a highly instrumented rotor assembly, seeded bearing defect signatures are characterized using both conventional linear approaches, such as power spectral density analysis, and recently developed nonlinear techniques such as bicoherence analysis. Traditional low-frequency (less than 20 kHz) analysis and high-frequency envelope analysis of both accelerometer and acoustic emission data are used to recover characteristic bearing distress information buried deeply in acquired data. The successful coupling of newly developed nonlinear signal analysis with recovered wideband envelope data from accelerometers and acoustic emission sensors is the innovative focus of this research.

  1. Eye movements - On-line measurement, analysis, and control

    Science.gov (United States)

    Anliker, J.

    1976-01-01

    The paper outlines the plans and progress related to the development of a Programmed Eye-track Recording System and Eye-coupled Ubiquitous Scene-generator known by the acronym PERSEUS. Particular attention is given to the design and implementation of a computer-based real-time eye-tracking system with associated digital scenic display capability. The accurate eye-tracker developed by Cornsweet and Crane (1973) is selected for this purpose. The discussion covers automatic detection of fixations and saccades, automatic scanpath analysis, fixation-conditional stimulation, and digital scene generation. The all-digital approach to scenic simulation not only eliminates the camera optics and electromechanical servomechanisms of TV-model systems of simulation but also opens the way to the virtually unlimited sequencing of data-base contents and perspectives thereof.

  2. Economic Analysis of Maize Stalk Borer Control in Kenya

    International Nuclear Information System (INIS)

    Stem borers significantly reduce maize grain yields in Kenya. However, no farm level systematic study has been carried out to determine the economic loss due to the pest. In order to estimate the loss of stem borers in maize production, experiments were carried out with the objectives of: estimating the economic value of maize losses due to stem borers; estimating the functional relationship between maize yield losses and stem borer damage estimators; and also obtain farmer perceptions on maize stem borers. The trials were superimposed on farmers' fields with one plot measuring 100M2 treated with Bulldock pesticide and the other one not. The experiment covered all the 7 maize agro-climatic zones in Kenya. Direct measurement of the Grain yields in the plots indicated that the average percentage yield loss was between, 3.5% - 15.7% in all sites. The yield loss translates to an average loss of Ksh. 6 billion or about 6 million bugs/90 kg , an equivalent of annual maize grain requirements for 3 million adult persons. This therefore calls for concerted efforts to control stem borers in order to meet household and national food security and income generation

  3. Scenario analysis of false indication in computer-control systems

    International Nuclear Information System (INIS)

    Highlights: ? A new failure mode and effect for safety-critical systems is proposed. ? False indication is the most dreadful kind of partial failures. ? A model-based simulation approach to generate failure scenarios is proposed. ? Simulation results showed that multiple errors may cause undesired consequences. ? An assertion-based method to detect false indication problems is provided. -- Abstract: Computer control may cause additional failure modes and effects that are new to analogue systems. False indication is one such failure mode that may bring unknown risks to a system. False indication refers to the problem when part of a system fails while other processes still work, and the failure is not revealed to operators. This paper presents a model-based simulation approach to systematically generate potential false indication and unintended consequences. Experiments showed that once a false indication occurs, it may have drastic effects on system safety. False indication can mislead the operator to perform adverse actions or no action. Therefore, we propose an assertion-based detection method to alleviate such failures. Our assertions contain process/device dependencies, timing relations and physical conservation rules. With these assertions, the operator may be alerted at run time. The proposed technique can reduce false indication problem. Moreover, it can also be used to assist the system design.

  4. Analysis of modified SMI method for adaptive array weight control

    Science.gov (United States)

    Dilsavor, R. L.; Moses, R. L.

    1989-01-01

    An adaptive array is applied to the problem of receiving a desired signal in the presence of weak interference signals which need to be suppressed. A modification, suggested by Gupta, of the sample matrix inversion (SMI) algorithm controls the array weights. In the modified SMI algorithm, interference suppression is increased by subtracting a fraction F of the noise power from the diagonal elements of the estimated covariance matrix. Given the true covariance matrix and the desired signal direction, the modified algorithm is shown to maximize a well-defined, intuitive output power ratio criterion. Expressions are derived for the expected value and variance of the array weights and output powers as a function of the fraction F and the number of snapshots used in the covariance matrix estimate. These expressions are compared with computer simulation and good agreement is found. A trade-off is found to exist between the desired level of interference suppression and the number of snapshots required in order to achieve that level with some certainty. The removal of noise eigenvectors from the covariance matrix inverse is also discussed with respect to this application. Finally, the type and severity of errors which occur in the covariance matrix estimate are characterized through simulation.

  5. COMPARATIVE ANALYSIS OF CONGESTION CONTROL MODELS FOR CELLULAR WIRELESS NETWORK

    Directory of Open Access Journals (Sweden)

    Falade A. J

    2015-08-01

    Full Text Available Cellular wireless systems like GSM suffer from congestion resulting in overall system degradation and poor service delivery. When the traffic demand in a geographical area is high, the input traffic rate will exceed thecapacity of the output lines. This work focused on homogenous wireless network (the network traffic and resource dimensioning that are statistically identical such that the network performance evaluation can be reduced to a system with single cell and a single traffic type. Such system can employa queuing model to evaluate the performance metric of a cell in terms of blocking probability. Five congestion control models were compared in the work to ascertain their peculiarities, they are Erlang B, Erlang C, Engset (cleared, Engset (buffered, and Bernoulli. To analyze the system, an aggregate onedimensional Markov chain wasderived, such that it describes a call arrival process under the assumption that it is Poisson distributed. The models were simulated and their results show varying performances, however the Bernoulli model (Pb5 tends to show a situation that allows more users access to the system and the congestion level remain unaffected despite increase in the number of users and the offered traffic into the system.

  6. Multiple factor analysis by example using R

    CERN Document Server

    Pagès, Jérôme

    2014-01-01

    Multiple factor analysis (MFA) enables users to analyze tables of individuals and variables in which the variables are structured into quantitative, qualitative, or mixed groups. Written by the co-developer of this methodology, Multiple Factor Analysis by Example Using R brings together the theoretical and methodological aspects of MFA. It also includes examples of applications and details of how to implement MFA using an R package (FactoMineR).The first two chapters cover the basic factorial analysis methods of principal component analysis (PCA) and multiple correspondence analysis (MCA). The

  7. A Mathematical Framework for the Analysis of Cyber-Resilient Control Systems

    Energy Technology Data Exchange (ETDEWEB)

    Melin, Alexander M [ORNL; Ferragut, Erik M [ORNL; Laska, Jason A [ORNL; Fugate, David L [ORNL; Kisner, Roger [ORNL

    2013-01-01

    The increasingly recognized vulnerability of industrial control systems to cyber-attacks has inspired a considerable amount of research into techniques for cyber-resilient control systems. The majority of this effort involves the application of well known information security (IT) techniques to control system networks. While these efforts are important to protect the control systems that operate critical infrastructure, they are never perfectly effective. Little research has focused on the design of closed-loop dynamics that are resilient to cyber-attack. The majority of control system protection measures are concerned with how to prevent unauthorized access and protect data integrity. We believe that the ability to analyze how an attacker can effect the closed loop dynamics of a control system configuration once they have access is just as important to the overall security of a control system. To begin to analyze this problem, consistent mathematical definitions of concepts within resilient control need to be established so that a mathematical analysis of the vulnerabilities and resiliencies of a particular control system design methodology and configuration can be made. In this paper, we propose rigorous definitions for state awareness, operational normalcy, and resiliency as they relate to control systems. We will also discuss some mathematical consequences that arise from the proposed definitions. The goal is to begin to develop a mathematical framework and testable conditions for resiliency that can be used to build a sound theoretical foundation for resilient control research.

  8. Comparative analysis of supercritical CO2 power conversion system control schemes

    International Nuclear Information System (INIS)

    A comparative analysis of control system performance was carried out for the S-CO2 re-compressing cycle. In this study two control strategies were developed for managing process variables for a change in load at the electrical generator. Both relied on inventory control to reduce power but differed in other significant respects. In inventory control turbomachine mass flow rates are reduced through density change with the goal of preserving velocity triangle similarity and, hence, cycle efficiency. An inventory and low temperature control scheme was operated to maintain a trajectory that avoids close approach to the critical point by controlling the main compressor inlet temperature. Shaft power tracks a setpoint by controlling density. This control scheme may be preferred in plant configurations that use a flow-split. There the rapid density change with pressure near the critical point can lead to flow rate instability. An inventory and turbine bypass control scheme was operated to more closely approach the critical point. Inventory in addition to turbine bypass was used to control shaft power. The first control scheme yielded greater efficiency at reduced power as a result of two factors. First, bypassing coolant around the turbine increases the mass flow rate through the compressors while shaft speed is maintained constant. As a result the compressor velocity triangles are altered from their peak efficiency values. Second, the bypass flow rate results in non-isothermal mixing downstream where the turbine and bypass flow combine which also penalizes efficiency. (authors)

  9. A Functional Analysis Framework for Modeling, Estimation and Control in Science and Engineering

    CERN Document Server

    Banks, HT

    2012-01-01

    A Modern Framework Based on Time-Tested Material A Functional Analysis Framework for Modeling, Estimation and Control in Science and Engineering presents functional analysis as a tool for understanding and treating distributed parameter systems. Drawing on his extensive research and teaching from the past 20 years, the author explains how functional analysis can be the basis of modern partial differential equation (PDE) and delay differential equation (DDE) techniques. Recent Examples of Functional Analysis in Biology, Electromagnetics, Materials, and Mechanics Through numerous application exa

  10. Experimental bifurcation analysis of an impact oscillator - Tuning a non-invasive control scheme

    DEFF Research Database (Denmark)

    Bureau, Emil; Schilder, Frank

    2013-01-01

    We investigate a non-invasive, locally stabilizing control scheme necessary for an experimental bifurcation analysis. Our test-rig comprises a harmonically forced impact oscillator with hardening spring nonlinearity controlled by electromagnetic actuators, and serves as a prototype for electromagnetic bearings and other machinery with build-in actuators. We propose a sequence of experiments that allows one to choose optimal control-gains, filter parameters and settings for a continuation method without a priori study of a model. Depending on the algorithm for estimating the Jacobian required by Newton's method we find two almost disjoint sets of suitable control parameters. Control-based continuation succeeds reliably in producing the full bifurcation diagram including both stable and unstable equilibrium states for an appropriately tuned controller.

  11. Quality Control of High-Dose-Rate Brachytherapy: Treatment Delivery Analysis Using Statistical Process Control

    Energy Technology Data Exchange (ETDEWEB)

    Able, Charles M., E-mail: cable@wfubmc.edu [Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, North Carolina (United States); Bright, Megan; Frizzell, Bart [Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, North Carolina (United States)

    2013-03-01

    Purpose: Statistical process control (SPC) is a quality control method used to ensure that a process is well controlled and operates with little variation. This study determined whether SPC was a viable technique for evaluating the proper operation of a high-dose-rate (HDR) brachytherapy treatment delivery system. Methods and Materials: A surrogate prostate patient was developed using Vyse ordnance gelatin. A total of 10 metal oxide semiconductor field-effect transistors (MOSFETs) were placed from prostate base to apex. Computed tomography guidance was used to accurately position the first detector in each train at the base. The plan consisted of 12 needles with 129 dwell positions delivering a prescribed peripheral dose of 200 cGy. Sixteen accurate treatment trials were delivered as planned. Subsequently, a number of treatments were delivered with errors introduced, including wrong patient, wrong source calibration, wrong connection sequence, single needle displaced inferiorly 5 mm, and entire implant displaced 2 mm and 4 mm inferiorly. Two process behavior charts (PBC), an individual and a moving range chart, were developed for each dosimeter location. Results: There were 4 false positives resulting from 160 measurements from 16 accurately delivered treatments. For the inaccurately delivered treatments, the PBC indicated that measurements made at the periphery and apex (regions of high-dose gradient) were much more sensitive to treatment delivery errors. All errors introduced were correctly identified by either the individual or the moving range PBC in the apex region. Measurements at the urethra and base were less sensitive to errors. Conclusions: SPC is a viable method for assessing the quality of HDR treatment delivery. Further development is necessary to determine the most effective dose sampling, to ensure reproducible evaluation of treatment delivery accuracy.

  12. Effect of the A-site cation on methane oxidation of perovskite-type (La{sub 1-x}M{sub x})CoO{sub 3} (M=Ca, Sr, and Ba)

    Energy Technology Data Exchange (ETDEWEB)

    Taguchi, Hideki, E-mail: htaguchi@cc.okayama-u.ac.jp [Graduate School of Natural Science and Technology (Science), Okayama University, 3-1-1 Tsushima-Naka, Kita-Ku, Okayama 700-8530 (Japan); Matsu-ura, Keiko [Graduate School of Natural Science and Technology (Science), Okayama University, 3-1-1 Tsushima-Naka, Kita-Ku, Okayama 700-8530 (Japan); Takada, Masao; Hirota, Ken [Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyo-Tanabe 610-0321 (Japan)

    2012-06-15

    Perovskite-type (La{sub 1-x}M{sub x})CoO{sub 3} (M=Ca, Sr, and Ba) synthesized at 700 Degree-Sign C in air using the polymerizable complex method had a rhombohedral perovskite-type structure in the range of x{<=}0.06. The oxygen content of the samples was 2.98-2.99, and the specific surface area was 3.5-8.3 m{sup 2}/g regardless of the M ion or x. The Rietveld method indicated that the Co-O distance was also constant regardless of the M ion or x, and that the Co-O-Co angle between two CoO{sub 6} octahedra increased with an increase in the ionic radius of the M ion. The temperature corresponding to the 50% conversion (T{sub 1/2}) of CH{sub 4} oxidation was almost constant for the samples with x=0.04, while the T{sub 1/2} of the samples with x=0.06 was linearly lowered with increases in the ionic radius of the M ion. - Graphical abstract: The conversion from CH{sub 4} to CO{sub 2} and H{sub 2}O on (La{sub 0.94}M{sub 0.06})CoO{sub 3} (M=Ca, Sr, and Ba). Highlights: Black-Right-Pointing-Pointer (La{sub 1-x}M{sub x})CoO{sub 3} (M=Ca, Sr, and Ba) was synthesized using the polymerizable complex method. Black-Right-Pointing-Pointer The Co-O distance was constant regardless of the M ion or x. Black-Right-Pointing-Pointer The Co-O-Co angle increased with an increase in the ionic radius of the M ion. Black-Right-Pointing-Pointer CH{sub 4} oxidation started above 300 Degree-Sign C and finished at 700 Degree-Sign C. Black-Right-Pointing-Pointer The catalytic activity increased with increases in the ionic radius of the M ion.

  13. ANALYSIS OF LEPTOBARBUS HOEVENII IN CONTROL ENVIRONMENT AT NATURAL LAKES

    Directory of Open Access Journals (Sweden)

    Mohd Khairul Amri Kamarudin

    2013-01-01

    Full Text Available Leptobarbus hoevenii or its common name Ikan Jelawat is a high-value fish from family Cyprinidae, genus Leptobarbus are omnivorous fish that can grow up to 60 cm long. Due to human activities and the time change, this species has been depleted in Lake Chini. As an initiative from the Malaysian government, a conservation project for this species has been carried out. This article discussed the results on growth-up monitoring of L. hoevenii on the food and environment factor in conservation cage at Lake Chini. Monitoring of the grown-up, food and water quality of chemical composition was carried out for four months of this study. The results of statistical analysis showed, L. hoevenii growth is a positive rate with the Body Weight (BW and Total Length (TL on R2 0.986 and R2 0.988 respectively, by using floating type â??grower pelletâ??, with 32% of protein. However, the Jemberau River basin is experiencing changes due logging and mining activities and that have affected to the chemical composition of the water quality and environmental. The iron content in the first week is ±0.0 mg L-1 change to ±5.0 mg L-1 and ±0.0 mg L-1 to ±2.0 mg L-1 for ammonia content in 10 weeks. The high content of the iron and ammonia on the water quality in the cage areas, effected for livestock to be stressed and also to the diet and growth-up of fish. 2500 of batch 1 L. hoevenii that has been released in Lake Chini showed they can be adapted to the local environment at the Laut Jemberau Lake, but take a time. Therefore, the closure of the Laut Jemberau Lake as fish conservation area is proposed to ensure that conservation objectives are achieved.

  14. Quality control statistic for laboratory analysis and assays in Departamento de Tecnologia de Combustiveis - IPEN-BR

    International Nuclear Information System (INIS)

    The purpose of this work is the study for introduction of the statistical control in test and analysis realized in the Departamento de Tecnologia de Combustiveis. Are succinctly introduced: theories of statistical process control, elaboration of control graphs, the definition of standards test (or analysis) and how the standards are employed for determination the control limits in the graphs. The more expressive result is the applied form for the practice quality control, moreover it is also exemplified the utilization of one standard of verification and analysis in the laboratory of control. (author)

  15. Dynamic modeling and controllability analysis of an ethanol reformer for fuel cell application

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, Vanesa M.; Serra, Maria; Riera, Jordi [Institut de Robotica i Informatica Industrial (CSIC-UPC), Llorens i Artigas 4-6, 08028 Barcelona (Spain); Lopez, Eduardo [Institut de Tecniques Energetiques, Universitat Politecnica de Catalunya, Diagonal 647, ed. ETSEIB, 08028 Barcelona (Spain); Planta Piloto de Ingenieria Quimica (CONICET-UNS), Camino de la Carrindanga km7, 8000 Bahia Blanca (Argentina); Llorca, Jordi [Institut de Tecniques Energetiques, Universitat Politecnica de Catalunya, Diagonal 647, ed. ETSEIB, 08028 Barcelona (Spain)

    2010-09-15

    This work presents a controllability analysis of a low temperature ethanol reformer based on a cobalt catalyst for fuel cell application. The study is based on a non-linear dynamic model of a reformer which operates in three separate stages: ethanol dehydrogenation to acetaldehyde and hydrogen, acetaldehyde steam reforming, and water-gas-shift reaction. The controllability analysis is focused on the rapid dynamics due to mass balances and is based on a linearization of the complex non-linear model of the reformer. RGA, CN and MRI analysis tools are applied to the linear model suggesting that a good performance can be obtained with decentralized control for frequencies up to 0.1 rad s{sup -1}. (author)

  16. Fault tree based reliability analysis for digital reactor power control system of nuclear power plant

    International Nuclear Information System (INIS)

    Fault tree method is used for reliability analysis for reactor power control system, including uncertainty analysis and sensitive analysis. 'loss of regulation accident' top event and 'loss of effective control' top event are defined, corresponding fault tree are constructed, and contribution of hardware failure and software failure to system safety are calculated. It points out that common mode failures of software, actuator, sensor and operator's response have significant influence to system reliability in 'loss of regulation accident'; software common mode failure and operators' response have significant contribution to system reliability in 'loss of efficient control accident'. (authors)

  17. Certified reference materials for analytical quality control in neutron activation analysis

    International Nuclear Information System (INIS)

    Analytical quality control in neutron activation analysis (NAA) requires the use of certified reference materials (CRM) in order to produce reliable analytical results. It is essential to evaluate the performance of NAA method when analyzing various sample matrices. Therefore, the CRM selected for an analysis should be suitable for the type of samples. There are many aspects such as concentration range, matrix match, sample size and uncertainty, which need to be considered when selecting a suitable CRM. Eventually, results of analysis of CRM were plotted into control charts in order to evaluate the qualify of the data. This is to ensure that the results are within the 95 % confidence interval as stipulated in the certificate of CRM. Thus, this article aims to discuss the uses of certified reference materials for quality control purposes in NAA involving various sample matrices. (author)

  18. Gestión del análisis de peligros y puntos críticos de control / Hazard-analysis and critical-control-points management

    Scientific Electronic Library Online (English)

    María Juliana, Moreno Guavita.

    2012-07-01

    Full Text Available El propósito de este artículo es presentar una revisión teórica de los beneficios y limitaciones del sistema "Análisis de riesgos y puntos críticos de control o HACCP (Hazard Analysis Critical Control Points)". Se ha demostrado que la implementación del sistema HACCP es una buena elección como instr [...] umento regulador y preventivo en las industrias alimenticias, pero no es suficiente, tiene limitaciones como: altos costos de infraestructura, falta de concientización, tiempo de ejecución, actividades de supervisión y documentación excesiva, entre otras. Quizás sea porque la industria es dinámica, evolutiva, flexible, rápida y no está limitada. Abstract in english The purpose of this arricie is to present a theoretical review of the benefits and limitations of the system called HACCP (Hazard Analysis Critical Control Points). The HACCP system has proved to be a good implementation choice (with its seven principies) as a regulatory and preventive instrument wi [...] thin the food industry. However, HACCP is not enough due to some limitations, namely its high infrastructure costs, the lack of widespread awareness, its implementation time, the demanding monitoring and excessive documentation, among others. This might occur since industry, in general, is dynamic, evolutionary, flexible, fast and unlimited.

  19. Technical Requirements Analysis and Control Systems (TRACS) Initial Operating Capability (IOC) documentation

    Science.gov (United States)

    Hammond, Dana P.

    1991-01-01

    The Technical Requirements Analysis and Control Systems (TRACS) software package is described. TRACS offers supplemental tools for the analysis, control, and interchange of project requirements. This package provides the fundamental capability to analyze and control requirements, serves a focal point for project requirements, and integrates a system that supports efficient and consistent operations. TRACS uses relational data base technology (ORACLE) in a stand alone or in a distributed environment that can be used to coordinate the activities required to support a project through its entire life cycle. TRACS uses a set of keyword and mouse driven screens (HyperCard) which imposes adherence through a controlled user interface. The user interface provides an interactive capability to interrogate the data base and to display or print project requirement information. TRACS has a limited report capability, but can be extended with PostScript conventions.

  20. Analysis of Nonlinear Speed-Torque Performance of SRM with Fuzzy Based Nonlinear Controller

    Directory of Open Access Journals (Sweden)

    BASANT KUMAR NAYAK

    2013-03-01

    Full Text Available By the use of linear controller the analysis of performance of SRM is not sufficient because of stator inductance of stator winding of SRM is function of rotor position, so here proposed to be design the nonlinear controller i.e. fuzzy based controller which converge the comparison analysis of SRM based on speed error and its change with respect time domain specification. Neural network and fuzzy logic technique are unique technique in which process the information specify by mathematical equation and compare with linear model of SRM. Arificial Neural Networks technique along with PI and Fuzzy PI has been implemented to design the controller to increase their performance. The comparison results give the more idea about the performance of SRM.