Sample records for maintenance problem resolution

  1. Joint scheduling of jobs and preventive maintenance operations in the flowshop sequencing problem: A resolution with sequential and integrated

    E-print Network

    Boyer, Edmond

    -heuristics are proposed: NEH heuristic, Genetic algorithm and Taboo search. The goal is to optimize an objective function, Preventive maintenance, Joint scheduling, GA, Taboo search, NEH heuristic, Flowshop. 1. Introduction

  2. Programmatic root cause analysis of maintenance personnel performance problems

    Microsoft Academic Search

    Inaba

    1991-01-01

    This report presents a method for diagnosing the programmatic root causes of personnel performance problems in the maintenance of nuclear power plants. The process uses normally available maintenance work order data to identify repeat maintenance caused by inadequate personnel performance. The primary emphasis of the analysis is on corrective maintenance, but the process will detect corrective maintenance actions caused by

  3. Can pump maintenance problems be solved by engineered modifications

    Microsoft Academic Search

    R. E. Allen; L. C. Chang

    1991-01-01

    Engineered solutions for vertical can-pump maintenance problems reduced maintenance costs and high production losses, and eliminated replacement costs. The vertical can pumps shown were installed in a major waterflood operation in California. Ten vertical pumping systems were installed at three locations in the field. Each system included a booster pump and an injection pump connected in series and mounted on

  4. Critical success factors and problems in ISO 9000 maintenance

    Microsoft Academic Search

    Roslina Ab Wahid; James Corner

    2009-01-01

    Purpose – The purpose of this paper is to try to identify the critical success factors and problems in ISO 9000 maintenance during the post-certification period. Much of the published work on issues associated with ISO 9000 certification in the quality management journals focuses on how to obtain certification and the impact of certification on ISO-certified organisations. Thus, studies do

  5. Resolved problems Wider IP resolution for rawhits

    E-print Network

    to a integer ­ Fixed by Alberto Strong IP asymmetry ­ Clustering mismatch between ftksim and banks ­ NowResolved problems Wider IP resolution for rawhits ­ Clustering: rounding cluster center follow... #12;Clustering vs IP width (corrgen) :-) #12;At high Pt, rawhit performance approaches

  6. Solving complex maintenance planning optimization problems using stochastic simulation and multi-criteria fuzzy decision making

    NASA Astrophysics Data System (ADS)

    Tahvili, Sahar; Österberg, Jonas; Silvestrov, Sergei; Biteus, Jonas

    2014-12-01

    One of the most important factors in the operations of many cooperations today is to maximize profit and one important tool to that effect is the optimization of maintenance activities. Maintenance activities is at the largest level divided into two major areas, corrective maintenance (CM) and preventive maintenance (PM). When optimizing maintenance activities, by a maintenance plan or policy, we seek to find the best activities to perform at each point in time, be it PM or CM. We explore the use of stochastic simulation, genetic algorithms and other tools for solving complex maintenance planning optimization problems in terms of a suggested framework model based on discrete event simulation.

  7. 1/N resolution to inflationary ?-problem

    NASA Astrophysics Data System (ADS)

    Ashoorioon, A.; Danielsson, U.; Sheikh-Jabbari, M. M.

    2012-07-01

    We observe that the dominant one loop contribution to the graviton propagator in the theory of N (N?1) light scalar fields ?a (with masses smaller than Mpl/N) minimally coupled to Einstein gravity is proportional to N while that of graviton-scalar-scalar interaction vertex is N independent. We use this to argue that the coefficient of the R?a2 term appearing at one loop level is 1/N suppressed. This observation provides a resolution to the quantum ?-problem, that the slow-roll parameter ? receives order one quantum loop corrections for inflationary models built within the framework of scalar fields minimally coupled to Einstein gravity, for models involving large number of fields. As particular examples, we employ this to argue in favor of the absence of ?-problem in multi-field inflationary scenarios of M-flation and N-flation.

  8. Maintenance of Materialized Views: Problems, Techniques, and Applications

    Microsoft Academic Search

    Ashish Gupta; Inderpal Singh Mumick

    1995-01-01

    In this paper we motivate and describe materialized views, their applications, and the problemsand techniques for their maintenance. We present a taxonomy of view maintenance problemsbased upon the class of views considered, upon the resources used to maintain the view, uponthe types of modifications to the base data that are considered during maintenance, and whetherthe technique works for all instances

  9. A Column Generation Model for a Scheduling Problem with Maintenance Constraints

    Microsoft Academic Search

    Eric Jacquet-lagrèze; Maria Lebbar

    1999-01-01

    In this paper we study an allocation and scheduling problem with maintenance constraints. It consists of two difficult sub-problems: a resource allocation sub-problem and a maintenance scheduling sub-problem. A Column Generation model is proposed to solve this problem. In order to be able to find optimal solutions for the relaxed (non integer) problem a model based on a graph with

  10. Distributed Computing Environment Software Maintenance: Problems of Measurement and Research

    Microsoft Academic Search

    Scott L. Schneberger; Ephraim R. Mclean

    1996-01-01

    Historically, the largest single life cycle computer vstem cost has been for maintaining information system software. More recently, the computing world has begun to undergo a significant transformation porn centralized computer architectures to non-centralized or distributed computer architectures. This paper discusses a new area of research on sojiivare maintenance (and development in generat), focusing on the issue of whether and

  11. Interventions for Weight Reduction: Facing the Maintenance Problem

    ERIC Educational Resources Information Center

    Anderson, Drew A.; Simmons, Angela M.; Milnes, Suzanne M.

    2005-01-01

    Behavioral treatments are perhaps the cornerstone of modern obesity treatment. Maintenance of weight lost via behavioral treatments has been less than hoped for, however. Weight regain is the result of complex interactions between physiological, behavioral, cognitive, and environmental factors; in this paper we review some of these factors and…

  12. Metered Data Analysis and Knowledge Based Methods that Reduce HVAC Operation and Maintenance Problems

    E-print Network

    Haberl, J. S.; Smith, L.; Kreider, J. F.

    1988-01-01

    Recent reports have highlighted a lower than expected level of understanding by some consulting engineers and building operators concerning how to systematically track operation and maintenance problems and provide consistent advice for improving...

  13. A Resolution of the Vacuum Energy Problem

    E-print Network

    Charles B. Leffert

    2003-08-01

    A new vision of the beginning and expansion of our universe has produced a solution to the vacuum energy problem (also known as "cosmological constant problem"). A new dynamic of cellular spaces and a discrete time has space being produced by a process called spatial condensation (SC). With generic energy defined as Planck's constant times the rate of cellular space production, both the vacuum energy and mass energy contents contribute to the expansion in the ratio 10^123/1, the same ratio of predicted densities by quantum theory and our astronomers. However, unlike mass energy, vacuum energy, like Casimir vacuum energy, does not carry the attribute of mass and so does not gravitate. A geometric derivation of the vacuum energy expansion rate was followed by a second derivation in terms of the evolution of the contents, from radiation to matter to dark mass (not matter). With a new definition of cosmic time, the second derivation was shown to produce exactly the same expansion rate. Free of singularities and inflation, both derivations also produced reasonable values of the cosmological parameters and the second derivation produced a good fit to the supernova Ia data with no acceleration of the expansion rate.

  14. Problem Resolution through Electronic Mail: A Five-Step Model.

    ERIC Educational Resources Information Center

    Grandgenett, Neal; Grandgenett, Don

    2001-01-01

    Discusses the use of electronic mail within the general resolution and management of administrative problems and emphasizes the need for careful attention to problem definition and clarity of language. Presents a research-based five-step model for the effective use of electronic mail based on experiences at the University of Nebraska at Omaha.…

  15. Internet-Based Recording Service Solves Maintenance Reporting Problems.

    ERIC Educational Resources Information Center

    Noah, Marilyn

    2001-01-01

    Details the response to a health threat caused by illegal wastewater disposal in Wisconsin. Traces the identification of the problem, ordinances and policies adopted to guide the remedy, and subsequent monitoring of environmental quality. (DDR)

  16. Do Self-Control Treatments Last? An Evaluation of Behavioral Problem Solving and Faded Counselor Contact as Treatment Maintenance Strategies.

    ERIC Educational Resources Information Center

    Richards, C. Steven; Perri, Michael G.

    1978-01-01

    Evaluated strategies for enhancing treatment maintenance: behavior problem solving and faded counselor contact. Volunteer college students concerned about academic underachievement participated. Results indicated training in problem solving was effective treatment maintenance strategy, while brief fading procedure was not. Treatment effects may…

  17. Theoretical Problems in High Resolution Solar Physics, 2

    NASA Technical Reports Server (NTRS)

    Athay, G. (editor); Spicer, D. S. (editor)

    1987-01-01

    The Science Working Group for the High Resolution Solar Observatory (HRSO) laid plans beginning in 1984 for a series of workshops designed to stimulate a broadbased input from the scientific community to the HRSO mission. These workshops have the dual objectives of encouraging an early start on the difficult theoretical problems in radiative transfer, magnetohydrodynamics, and plasma physics that will be posed by the HRSO data, and maintaining current discussions of results in high resolution solar studies. This workshop was the second in the series. The workshop format presented invited review papers during the formal sessions and contributed poster papers for discussions during open periods. Both are presented.

  18. Adapting problem-solving therapy for depressed older adults in methadone maintenance treatment

    PubMed Central

    Rosen, Daniel; Morse, Jennifer Q; Reynolds, Charles F

    2011-01-01

    Late life depression is prevalent in older adults who are dependent on opiates. Depressive disorders among opiate abusers have detrimental effects on their well-being and ability to refrain from illegal drugs. There are numerous barriers to the provision of appropriate mental health care to older adults receiving methadone maintenance treatment. This article focuses on problem solving therapy (PST) and presents evidence that PST may be a promising non-pharmacological treatment for older methadone clients with comorbid depressive disorders that can be applied within the staffing and resource limits of methadone maintenance treatment facilities. The advantages of PST relative to other behavioral therapies for this population are based on evidence that PST is less cognitively demanding for an older adult population with mood and substance use disorders. A properly modified PST for an older adult substance dependent population with subsyndromal or diagnosed depression may be a viable option for methadone maintenance programs with limited resources. PMID:21036509

  19. A Study of Maintenance Contribution to a Joint Production and Preventive maintenance Scheduling Problem in the Robustness

    E-print Network

    Paris-Sud XI, Université de

    research line. Another task closely related to production scheduling in industrial settings is PreventiveA Study of Maintenance Contribution to a Joint Production and Preventive maintenance Scheduling Christophe Varnier and Noureddine Zerhouni FEMTO-ST Institute, Automatic Control and Micro

  20. The Problem History DPLL Resolution WatchLit Conclusion SAT Solvers

    E-print Network

    Ayala-Rincón, Mauricio

    The Problem History DPLL Resolution WatchLit Conclusion SAT Solvers A Brief Introduction Marcelo Marcelo Finger IME-USP SAT Solvers #12;The Problem History DPLL Resolution WatchLit Conclusion Topics 1 The Problem 2 A Brief History of SAT Solvers 3 The DPLL Algorithm 4 DPLL and Resolution 5 Watched Literals 6

  1. Hybrid particle swarm optimization for hybrid flowshop scheduling problem with maintenance activities.

    PubMed

    Li, Jun-qing; Pan, Quan-ke; Mao, Kun

    2014-01-01

    A hybrid algorithm which combines particle swarm optimization (PSO) and iterated local search (ILS) is proposed for solving the hybrid flowshop scheduling (HFS) problem with preventive maintenance (PM) activities. In the proposed algorithm, different crossover operators and mutation operators are investigated. In addition, an efficient multiple insert mutation operator is developed for enhancing the searching ability of the algorithm. Furthermore, an ILS-based local search procedure is embedded in the algorithm to improve the exploitation ability of the proposed algorithm. The detailed experimental parameter for the canonical PSO is tuning. The proposed algorithm is tested on the variation of 77 Carlier and Néron's benchmark problems. Detailed comparisons with the present efficient algorithms, including hGA, ILS, PSO, and IG, verify the efficiency and effectiveness of the proposed algorithm. PMID:24883414

  2. Application of the genetic algorithm for global scheduling and a single machine scheduling problem with periodic maintenance and semiresumable jobs

    E-print Network

    Graves, Gregory Howard

    1998-01-01

    APPLICATION OF THE GENETIC ALGORITHM FOR GLOBAL SCHEDULING AND A SINGLE MACHINE SCHEDULING PROBLEM WITH PERIODIC MAINTENANCE AND SEMIRESUMABLE JOBS A Thesis by GREGORY HOWARD GRAVES Submitted to the Office of Graduate Studies of Texas A... MAINTENANCE AND SEMIRESUMABLE JOBS A Thesis by GREGORY HOWARD GRAVES Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: Chung- Yee Lee (Chair...

  3. OPTIMIZATION AS A TOOL FOR CONSISTENCY MAINTENANCE IN MULTI-RESOLUTION SIMULATION

    E-print Network

    Brogan, David

    of inverse modeling and spacetime constraint-based animation. As a case study, our methodology is applied. These inconsistencies are a product of multiple complexities occurring in the coupled multi-resolution system the proper identification of internal model controls, which may be quite different for the various models

  4. Operation and maintenance manual for the high resolution stereoscopic video camera system (HRSVS) system 6230

    SciTech Connect

    Pardini, A.F., Westinghouse Hanford

    1996-07-16

    The High Resolution Stereoscopic Video Cameral System (HRSVS),system 6230, is a stereoscopic camera system that will be used as an end effector on the LDUA to perform surveillance and inspection activities within Hanford waste tanks. It is attached to the LDUA by means of a Tool Interface Plate (TIP), which provides a feed through for all electrical and pneumatic utilities needed by the end effector to operate.

  5. Lightweight Relevance Filtering for Machine-Generated Resolution Problems

    E-print Network

    Paulson, Lawrence C.

    extensive tests with a set of 285 such problems (153 small, 132 large). Vampire does well on our problem set problem, which is more realistic for user interaction, Vampire's success rate drops to 53 percent. (See

  6. Double Shell Tank (DST) Maintenance and Recovery Subsystem Definition Report

    SciTech Connect

    SMITH, E.A.

    2000-07-26

    The description of the Double-Shell Tank (DST) Maintenance and Recovery Subsystem presented in this document was developed to establish its boundaries. The DST Maintenance and Recovery Subsystem consists of new and existing equipment and facilities used to provide tank farm operators logistic support and problem resolution for the DST System during operations. This support will include evaluating equipment status, performing preventive and corrective maintenance, developing work packages, managing spares and consumables, supplying tooling, and training maintenance and operations personnel.

  7. Taxonomic Resolution as a Conceptual Problem for Understanding Ecological Science

    Microsoft Academic Search

    T. Lafrancois

    2005-01-01

    The results of ecological analyses can vary with the taxonomic resolution(s) used to sort and quantify the organisms studied. It seems intuitive that the finest unit of taxonomy results in the finest discrimination of ecological processes, and this is certainly true in many cases (e.g. Hawkins 2000, Attayde 2001). However, other important work suggests that some ecological processes (e.g. Bowman

  8. Predictors of Utilization of an IVR Self-Monitoring Program by Problem Drinkers with Recent Natural Resolutions

    PubMed Central

    Simpson, Cathy A.; Huang, Jin; Roth, David L.; Chandler, Susan D.; Tucker, Jalie A.

    2014-01-01

    BACKGROUND As part of a randomized controlled trial, problem drinkers who recently initiated natural recovery on their own were offered access to an Interactive Voice Response (IVR) self-monitoring (SM) system as a sobriety maintenance tool during early recovery when relapse risk is high. Because observed IVR utilization was variable, predictors of utilization were evaluated to inform knowledge of populations likely to access and use IVR services. METHODS Participants were 87 untreated community-dwelling adults who recently initiated sobriety following longstanding high-risk drinking practices and alcohol-related problems (M = 16.58 years, SD = 10.95). Baseline interviews assessed pre-resolution drinking practices and problems, and behavioral economic (BE) measures of reward preferences (delay discounting, pre-resolution monetary allocation). Participants had IVR access for 24 weeks to report daily drinking and to hear weekly recovery-focused messages. RESULTS IVR use ranged from 0 to 100%. Frequent (n = 28), infrequent (n = 42), and non-caller (n = 17) groups were identified. Non-callers tended to be younger and to report heavier pre-resolution drinking. Frequent callers (? 70% of IVR days) tended to be older, male non-smokers with higher/stable socio-economic status and lower delay discounting compared to infrequent callers. Premature drop-out typically occurred fairly abruptly and was related to extended binge drinking. CONCLUSIONS Characteristics common in the untreated problem drinker population were associated with higher IVR utilization. This large under-served population segment can be targeted for lower intensity alcohol interventions using an IVR platform. PMID:22682100

  9. A high-resolution mapped grid algorithm for compressible multiphase flow problems

    E-print Network

    Shyue, Keh-Ming

    A high-resolution mapped grid algorithm for compressible multiphase flow problems K.-M. Shyue mapped grid approach for the efficient numerical simula- tion of compressible multiphase flow in general for efficient numer- ical resolution of compressible multiphase flow in general multi-dimensional geometries

  10. Complete Resolution of Neuroendocrine Tumor Soft Tissue Metastases After 177Lu DOTATATE PRRT Induction and Maintenance Therapy.

    PubMed

    Makis, William; McCann, Karey; Buteau, Francois A; McEwan, Alexander J B

    2015-08-01

    A 60-year-old woman diagnosed with a well-differentiated neuroendocrine tumor metastatic to the liver and lymph nodes was treated with 4 induction cycles and 2 maintenance cycles of Lu [DOTA,Tyr]octreotate (DOTATATE) peptide receptor radionuclide therapy. Her posttreatment imaging showed partial response after 4 induction cycles and complete response after 2 additional maintenance cycles. This case highlights the need for further research into maintenance Lu DOTATATE therapy to improve outcomes in neuroendocrine tumor patients. PMID:25546219

  11. Problems and Resolutions in the Practice of Project Teaching in Higher Vocational Schools

    ERIC Educational Resources Information Center

    Sheng, Zhichong; Tan, Jianhua

    2011-01-01

    Recently, there has been a hot discussion on project teaching theory among many higher vocational schools; however the practice of project teaching is still in the beginning period. Hence, many problems appear in project lead. This paper aims to analyze the existing problems in the practice of project teaching and also raise some resolutions.

  12. Buying Into Maintenance.

    ERIC Educational Resources Information Center

    May, Abigail

    1998-01-01

    Describes how educational institutions are recognizing the short-sightedness of deferred maintenance. Discusses the challenges facing schools as they confront maintenance costs and what they must do to address the problem. Offers advice on proactive stances toward maintenance such as computerized work control processes, maintenance zones, and…

  13. Behavioral Economic Analysis of Natural Resolution of Drinking Problems using IVR Self-Monitoring

    PubMed Central

    Tucker, Jalie A.; Foushee, H. Russell; Black, Bethany C.

    2008-01-01

    This study investigated whether a behavioral economic index of the value of rewards available over different time horizons predicted patterns of alcohol consumption shortly after natural resolution when the risk of relapse is high. Using a computerized Interactive Voice Response (IVR) telephone system, untreated problem drinkers (n = 41) self-monitored their daily drinking, monetary expenditures, and surrounding contexts over intervals that ranged from a maximum of 42 to 128 days. Expanded Timeline Followback interviews were conducted before and after the IVR interval and one year after the baseline assessment. Stable resolutions generally and moderation resolutions specifically were associated with proportionally more pre-resolution expenditures on savings and less on alcohol compared to heavy drinking outcomes. The findings replicated and extended earlier research and suggested that the extent to which problem drinkers organized their behavior over longer intervals, even when drinking abusively, helped identify who resolved, including who transitioned to stable moderation. PMID:18729688

  14. Resolution of intimate partner violence and child behavior problems after investigation for suspected child maltreatment.

    PubMed

    Campbell, Kristine A; Thomas, Andrea M; Cook, Lawrence J; Keenan, Heather T

    2013-03-01

    OBJECTIVE To describe longitudinal change in child behavior problems associated with resolution of intimate partner violence (IPV) after an investigation for suspected child maltreatment. DESIGN Retrospective cohort study. SETTING The National Survey of Child and Adolescent Well-Being, a nationally representative longitudinal sample of US households investigated for suspected child maltreatment. PARTICIPANTS The study included 320 school-aged subjects with caregiver-reported IPV in the year prior to baseline interview. Caregivers were interviewed an average of 3, 20, 36, and 81 months following investigation. MAIN EXPOSURE Resolution vs persistence of baseline IPV. Persistence was defined by report of IPV during any follow-up interview. MAIN OUTCOME MEASURES Clinically significant internalizing or externalizing child behavior problems. RESULTS In total, 44.6% of caregivers who reported IPV at the baseline interview reported persistent IPV. After adjusting for significant covariates, IPV resolution was associated with an 11.9% reduction in internalizing problems by 81 months (P = .03); IPV persistence was associated with persistence in baseline problems. Resolution of IPV was associated with an 18.5% reduction in externalizing problems by 20 months that was sustained at 36 and 81 months (all P < .05). Intimate partner violence persistence was associated with a steady but nonsignificant increase in externalizing behavior problems during 81 months (10.1%, P = .07). The adjusted relative risks for internalizing and externalizing behavior problems 81 months following a child protective services investigation for children exposed to persistent vs resolved IPV were 1.79 (95% CI, 0.91-3.52) and 1.88 (95% CI, 1.12-3.18), respectively. CONCLUSIONS Resolution of IPV after a child protective services investigation for suspected child maltreatment is associated with meaningful, sustained reductions in clinically significant child behavior problems. PMID:23318576

  15. Some fundamental problems for an energy-conserving adaptive-resolution molecular dynamics scheme

    NASA Astrophysics Data System (ADS)

    Delle Site, Luigi

    2007-10-01

    Adaptive-resolution molecular dynamics (MD) schemes allow for changing the number of degrees of freedom on the fly and preserve the free exchange of particles between regions of different resolution. There are two main alternatives on how to design the algorithm to switch resolution using auxiliary “switching” functions: force based and potential energy based approaches. In this work we show that, in the framework of classical MD, the latter presents fundamental conceptual problems which make unlikely, if not impossible, the derivation of a robust algorithm based on the potential energy.

  16. Some fundamental problems for an energy-conserving adaptive-resolution molecular dynamics scheme.

    PubMed

    Delle Site, Luigi

    2007-10-01

    Adaptive-resolution molecular dynamics (MD) schemes allow for changing the number of degrees of freedom on the fly and preserve the free exchange of particles between regions of different resolution. There are two main alternatives on how to design the algorithm to switch resolution using auxiliary "switching" functions: force based and potential energy based approaches. In this work we show that, in the framework of classical MD, the latter presents fundamental conceptual problems which make unlikely, if not impossible, the derivation of a robust algorithm based on the potential energy. PMID:17995141

  17. Resolution of image processing problems by dynamic planning within the framework of the blackboard model

    E-print Network

    Paris-Sud XI, Université de

    Resolution of image processing problems by dynamic planning within the framework of the blackboard of classical IP operators. 1. INTRODUCTION Non specialized Image Processing (IP) is no easy task because concepts related to Image Processing used in a knowledge-based system in IP, that should be automatic

  18. Maintenance Therapy

    MedlinePLUS

    Maintenance Therapy Periodontal disease is a chronic (long-lasting) problem. It can return if you don't get regular follow-up care. ... factors: Whether you have mild, moderate or severe periodontal disease Whether your disease tends to come back Whether ...

  19. Severe Maintenance Problems as Your First Indicator of Big Potential Energy Savings 

    E-print Network

    Kaufman, S. G.; Martin, V.; Lynn, J.

    1998-01-01

    , and a new control scheme. Although the original objective of the project was to save gas energy with the new recuperator, it was also recognized that this was an ideal opportunity to deal with a serious and persistent ductwork cracking problem. Algoma...

  20. Training EMR Children to Solve Missing Minuend Problems Errorlessly: Acquisition, Generalization, and Maintenance.

    ERIC Educational Resources Information Center

    Smeets, Paul M.; And Others

    1984-01-01

    The study evaluated an errorless procedure for teaching nine educable mentally retarded students to solve missing minuend problems. Seven Ss acquired the target skill in a nearly errorless fashion in 75 to 172 minutes of individual training time. The other Ss required programatic alterations. (Author/CL)

  1. Joint application of AI techniques, PRA and disturbance analysis methodology to problems in the maintenance and design of nuclear power plants. Final report

    SciTech Connect

    Okrent, D.

    1989-03-01

    This final report summarizes the accomplishments of a two year research project entitled ``Joint Application of Artificial Intelligence Techniques, Probabilistic Risk Analysis, and Disturbance Analysis Methodology to Problems in the Maintenance and Design of Nuclear Power Plants. The objective of this project is to develop and apply appropriate combinations of techniques from artificial intelligence, (AI), reliability and risk analysis and disturbance analysis to well-defined programmatic problems of nuclear power plants. Reactor operations issues were added to those of design and maintenance as the project progressed.

  2. Joint application of AI techniques, PRA and disturbance analysis methodology to problems in the maintenance and design of nuclear power plants

    SciTech Connect

    Okrent, D.

    1989-03-01

    This final report summarizes the accomplishments of a two year research project entitled Joint Application of Artificial Intelligence Techniques, Probabilistic Risk Analysis, and Disturbance Analysis Methodology to Problems in the Maintenance and Design of Nuclear Power Plants. The objective of this project is to develop and apply appropriate combinations of techniques from artificial intelligence, (AI), reliability and risk analysis and disturbance analysis to well-defined programmatic problems of nuclear power plants. Reactor operations issues were added to those of design and maintenance as the project progressed.

  3. The Differential Association between Change Request Qualities and Resistance, Problem Resolution, and Relationship Satisfaction

    PubMed Central

    Mitnick, Danielle M.; Heyman, Richard E.; Malik, Jill; Smith Slep, Amy M.

    2009-01-01

    Although research supports the negative sequelae of the “demand-withdrawal” pattern, research is scant on the impact of “non-demanding” change requests (e.g., specific, increasing, and “we” requests). We hypothesize that such change requests will be associated with less partner withdrawal/resistance, better problem resolution, and greater relationship satisfaction. Seventy-two conversations between couples who were recruited through random digit dialing were coded for change request qualities. Results indicate that wife specific and “we” requests led to less husband resistance, and husband increasing and “we” requests led to less wife resistance. Greater percentages of wife and husband specific and “we” requests were related to better problem resolution in the conversation, and greater percentages of wife specific and “we” requests were related to greater wife satisfaction. Research and clinical implications are detailed. PMID:19685982

  4. Wilkinson Microwave Anisotropy Probe (WMAP) Battery Operations Problem Resolution Team (PRT)

    NASA Technical Reports Server (NTRS)

    Keys, Denney J.

    2010-01-01

    The NASA Technical Discipline Fellow for Electrical Power, was requested to form a Problem Resolution Team (PRT) to help assess the health of the flight battery that is currently operating aboard NASA's Wilkinson Microwave Anisotropy Probe (WMAP) and provide recommendations for battery operations to mitigate the risk of impacting science operations for the rest of the mission. This report contains the outcome of the PRT's assessment.

  5. Divergence identities in curved space-time a resolution of the stress-energy problem

    NASA Astrophysics Data System (ADS)

    Yilmaz, Hüseyin

    1989-03-01

    It is noted that the joint use of two basic differential identities in curved space-time, namely, 1) the Einstein-Hilbert identity (1915), and 2) the identity of P. Freud (1939), permits a viable alternative to general relativity and a resolution of the "field stress-energy" problem of the gravitational theory. (A tribute to Eugene P. Wigner's 1957 presidential address to the APS)

  6. Preventive maintenance models with random maintenance quality

    Microsoft Academic Search

    Shaomin Wu; Derek Clements-Croome

    2005-01-01

    In real-world environments it is usually difficult to specify the quality of a preventive maintenance (PM) action precisely. This uncertainty makes it problematic to optimise maintenance policy. This problem is tackled in this paper by assuming that the quality of a PM action is a random variable following a probability distribution. Two frequently studied PM models, a failure rate PM

  7. Modeling and Resolution of the Medium Term Energy Generation Planning Problem for a Large HydroElectric System

    Microsoft Academic Search

    Melville A. Hanscom; Louis Lafond; Leon Lasdon; Gaston Pronovost

    1980-01-01

    This paper is concerned with the modeling and resolution of the energy generation planning problem of a large hydroelectric system for a horizon up to two years, with emphasis on hydro plant generation, hydro system aggregation, and objective function modeling. The problem has been formulated as a deterministic discrete-time optimal control problem, with linear transition equations, a highly nonlinear objective,

  8. Social Environmental Influences on the Development and Resolution of Alcohol Problems

    PubMed Central

    McCrady, Barbara S.; Zucker, Robert A.; Molina, Brooke S. G.; Ammon, Lyndsay; Ames, Genevieve M.; Longabaugh, Richard

    2006-01-01

    This article summarizes the proceedings of a symposium presented at the 2005 Annual Meeting of the Research Society on Alcoholism, Santa Barbara, California, June 25–30. The overall goal of the symposium was to consider the broad impact of the social environment on the development of and successful or unsuccessful resolution of drinking problems. The presentations addressed multiple social environmental influences including: the influence of children on parents (Dr. Zucker), the influence of peers and parents on adolescents (Dr. Molina), the influence of family members on adult drinking (Dr. McCrady), the influence of adult peers/friends (Dr. Kaskutas), and the influence of the occupational environment (Dr. Ames). Dr. Longabaugh, the symposium discussant, addressed models for understanding the relationships between social influences and drinking problems. PMID:16573588

  9. Applications of shallow high-resolution seismic reflection to various environmental problems

    USGS Publications Warehouse

    Miller, R.D.; Steeples, D.W.

    1994-01-01

    Shallow seismic reflection has been successfully applied to environmental problems in a variety of geologic settings. Increased dynamic range of recording equipment and decreased cost of processing hardware and software have made seismic reflection a cost-effective means of imaging shallow geologic targets. Seismic data possess sufficient resolution in many areas to detect faulting with displacement of less than 3 m and beds as thin as 1 m. We have detected reflections from depths as shallow as 2 m. Subsurface voids associated with abandoned coal mines at depths of less than 20 m can be detected and mapped. Seismic reflection has been successful in mapping disturbed subsurface associated with dissolution mining of salt. A graben detected and traced by seismic reflection was shown to be a preferential pathway for leachate leaking from a chemical storage pond. As shown by these case histories, shallow high-resolution seismic reflection has the potential to significantly enhance the economics and efficiency of preventing and/or solving many environmental problems. ?? 1994.

  10. Heavy Ion Beam in Resolution of the Critical Point Problem for Uranium and Uranium Dioxide

    E-print Network

    Igor Iosilevskiy; Victor Gryaznov

    2010-05-23

    Important advantages of heavy ion beam (HIB) irradiation of matter are discussed in comparison with traditional sources - laser heating, electron beam, electrical discharge etc. High penetration length (~ 10 mm) is of primary importance for investigation of dense matter properties. This gives an extraordinary chance to reach the uniform heating regime when HIB irradiation is being used for thermophysical property measurements. Advantages of HIB heating of highly-dispersive samples are claimed for providing free and relatively slow quasi-isobaric heating without fast hydrodynamic expansion of heated sample. Perspective of such HIB application are revised for resolution of long-time thermophysical problems for uranium and uranium-bearing compounds (UO2). The priorities in such HIB development are stressed: preferable energy levels, beam-time duration, beam focusing, deposition of the sample etc.

  11. Study on Intelligent Expressway Maintenance System

    Microsoft Academic Search

    Tao Han; Congdong Li

    2008-01-01

    Expressway maintenance is very important for the well operation of expressway which is an essential part of national infrastructure. But traditional methods could not meet the requirements of maintenance management of fast developed expressway. Intelligent expressway maintenance system (IEMS) is a new way to solve the problem of expressway maintenance. Firstly, characters of expressway maintenance work are pointed out to

  12. Application of CFD Analysis to Design Support and Problem Resolution for ASRM and RSRM

    NASA Technical Reports Server (NTRS)

    Dill, Richard A.; Whitesides, R. Harold

    1993-01-01

    The use of Navier-Stokes CFD codes to predict the internal flow field environment in a solid rocket motor is a very important analysis element during the design phase of a motor development program. These computational flow field solutions uncover a variety of potential problems associated with motor performance as well as suggesting solutions to these problems. CFD codes have also proven to be of great benefit in explaining problems associated with operational motors such as in the case of the pressure spike problem with the STS-54B flight motor. This paper presents results from analyses involving both motor design support and problem resolution. The issues discussed include the fluid dynamic/mechanical stress coupling at field joints relative to significant propellant deformations, the prediction of axial and radial pressure gradients in the motor associated with motor performance and propellant mechanical loading, the prediction of transition of the internal flow in the motor associated with erosive burning, the accumulation of slag at the field joints and in the submerged nozzle region, impingement of flow on the nozzle nose, and pressure gradients in the nozzle region of the motor. The analyses presented in this paper have been performed using a two-dimensional axisymmetric model. Fluent/BFC, a three dimensional Navier-Stokes flow field code, has been used to make the numerical calculations. This code utilizes a staggered grid formulation along with the SIMPLER numerical pressure-velocity coupling algorithm. Wall functions are used to represent the character of the viscous sub-layer flow, and an adjusted k-epsilon turbulence model especially configured for mass injection internal flows, is used to model the growth of turbulence in the motor port. Conclusions discussed in this paper consider flow field effects on the forward, center, and aft propellant grains except for the head end star grain region of the forward propellant segment. The field joints and the submerged nozzle are discussed as well. Conclusions relative to both the design evaluation of the ASRM and the RSRM scenarios explaining the pressure spikes were based on the flow field solutions presented in this paper.

  13. GUIDELINES FOR IMPLEMENTATION OF AN ADVANCED OUTAGE CONTROL CENTER TO IMPROVE OUTAGE COORDINATION, PROBLEM RESOLUTION, AND OUTAGE RISK MANAGEMENT

    SciTech Connect

    Germain, Shawn St; Farris, Ronald; Whaley, April M; Medema, Heather; Gertman, David

    2014-09-01

    This research effort is a part of the Light-Water Reactor Sustainability (LWRS) Program, which is a research and development (R&D) program sponsored by Department of Energy (DOE) and performed in close collaboration with industry R&D programs that provide the technical foundations for licensing and managing the long-term, safe, and economical operation of current nuclear power plants. The LWRS program serves to help the U.S. nuclear industry adopt new technologies and engineering solutions that facilitate the continued safe operation of the plants and extension of the current operating licenses. Managing NPP outages is a complex and difficult task due to the large number of maintenance and repair activities that are accomplished in a short period of time. During an outage, the outage control center (OCC) is the temporary command center for outage managers and provides several critical functions for the successful execution of the outage schedule. Essentially, the OCC functions to facilitate information inflow, assist outage management in processing information, and to facilitate the dissemination of information to stakeholders. Currently, outage management activities primarily rely on telephone communication, face to face reports of status, and periodic briefings in the OCC. It is a difficult task to maintain current the information related to outage progress and discovered conditions. Several advanced communication and collaboration technologies have shown promise for facilitating the information flow into, across, and out of the OCC. The use of these technologies will allow information to be shared electronically, providing greater amounts of real-time information to the decision makers and allowing OCC coordinators to meet with supporting staff remotely. Passively monitoring status electronically through advances in the areas of mobile worker technologies, computer-based procedures, and automated work packages will reduce the current reliance on manually reporting progress. The use of these technologies will also improve the knowledge capture and management capabilities of the organization. The purpose of this research is to improve management of NPP outages through the development of an advanced outage control center (AOCC) that is specifically designed to maximize the usefulness of communication and collaboration technologies for outage coordination and problem resolution activities. This technical report for industry implementation outlines methods and considerations for the establishment of an AOCC. This report provides a process for implementation of a change management plan, evaluation of current outage processes, the selection of technology, and guidance for the implementation of the selected technology. Methods are presented for both adoption of technologies within an existing OCC and for a complete OCC replacement, including human factors considerations for OCC design and setup.

  14. eMaintenance—Information logistics for maintenance support

    Microsoft Academic Search

    Olov Candell; Ramin Karim; Peter Söderholm

    2009-01-01

    Today's providers of maintenance and in-service support related to modern aircraft are facing major challenges. A central problem with Maintenance, Repair and Overhaul (MRO) as well as support of aircraft and other complex technical systems, is to manage the ever-increasing information flow and system complexity. Both military and commercial operators need to reduce aircraft downtime and maintenance man hours. Increased

  15. The Application of High-Resolution Electron Microscopy to Problems in Solid State Chemistry: The Exploits of a Peeping TEM.

    ERIC Educational Resources Information Center

    Eyring, LeRoy

    1980-01-01

    Describes methods for using the high-resolution electron microscope in conjunction with other tools to reveal the identity and environment of atoms. Problems discussed include the ultimate structure of real crystalline solids including defect structure and the mechanisms of chemical reactions. (CS)

  16. General aviation avionics equipment maintenance

    NASA Technical Reports Server (NTRS)

    Parker, C. D.; Tommerdahl, J. B.

    1978-01-01

    Maintenance of general aviation avionics equipment was investigated with emphasis on single engine and light twin engine general aviation aircraft. Factors considered include the regulatory agencies, avionics manufacturers, avionics repair stations, the statistical character of the general aviation community, and owners and operators. The maintenance, environment, and performance, repair costs, and reliability of avionics were defined. It is concluded that a significant economic stratification is reflected in the maintenance problems encountered, that careful attention to installations and use practices can have a very positive impact on maintenance problems, and that new technologies and a general growth in general aviation will impact maintenance.

  17. Inhibitory Control Is Needed for the Resolution of Arithmetic Word Problems: A Developmental Negative Priming Study

    ERIC Educational Resources Information Center

    Lubin, Amélie; Vidal, Julie; Lanoë, Céline; Houdé, Olivier; Borst, Grégoire

    2013-01-01

    Solving simple arithmetic word problems is a major ability that children must acquire throughout the primary-grade mathematics curriculum. However, this skill is often challenging for them. For instance, "unknown referent problems" are more difficult to solve than "unknown compare problems." In unknown compare problems, the…

  18. The Effect of Conflict Resolution Training on Children’s Behavioral Problems in Shiraz, Southern Iran: A Randomized Controlled Trial

    PubMed Central

    Soleimani, Sara; Sharif, Farkhondeh; Mani, Arash; Keshavarzi, Sareh

    2014-01-01

    Background: There is evidence that marital problems can contribute to child behavior problems. In fact, the way that parents solve their conflicts, such as aggression, physical violence, and poor communication skills, can eventually culminate in aggression and emotional problems in children. This study aimed to evaluate the effectiveness of conflict resolution training on children’s behavioral problems in a sample of Iranian couples. Methods: This randomized controlled trial study was carried out on the couples who referred to counseling centers in Shiraz, Iran. In this study, 56 couples were selected through convenience sampling and assigned to an intervention and a control group. The intervention group received 10 sessions of communication skills training. All the participants filled out conflict resolution questionnaire and Child Behavior Problem Checklist (CBCL). To analyze the data we used the SPSS statistical software (version 16), using repeated measurement test, paired t-test, and independent t test. Results: In this study, no statistically significant differences were found between the two groups regarding the demographic characteristics. Also, no significant difference was observed between the two groups regarding the mean score of child behavior problems. Besides, a significant difference was found in the intervention group’s mean score of marital conflict in post-test compared to the pre-test; however, no such trend was observed in the control group. Conclusion: Conflict resolution skill training was effective in reducing marital conflict. Also, it showed a slight reduction in the score of child behavior problems after the intervention. But this reduction wasn’t statisticaly significant. Trial Registration Number: IRCT201109112812N2 PMID:25349861

  19. Resolution of inventive problems: different kind of mechanisms Sebastien DuboisSebastien Dubois11

    E-print Network

    Paris-Sud XI, Université de

    , and evaluation functions. We try to analyze how different solving methods explore the problem space, which external information to com- pensate for missing information and using it to con- struct the problem space. These are used to specify the design assignment (de- fining the problem space) and to describe and explore

  20. Effects of Interactive Voice Response Self-Monitoring on Natural Resolution of Drinking Problems: Utilization and Behavioral Economic Factors

    PubMed Central

    Tucker, Jalie A.; Roth, David L.; Huang, Jin; Scott Crawford, M.; Simpson, Cathy A.

    2012-01-01

    Objective: Most problem drinkers do not seek help, and many recover on their own. A randomized controlled trial evaluated whether supportive interactive voice response (IVR) self-monitoring facilitated such “natural” resolutions. Based on behavioral economics, effects on drinking outcomes were hypothesized to vary with drinkers’ baseline “time horizons,” reflecting preferences among commodities of different value available over different delays and with their IVR utilization. Method: Recently resolved untreated problem drinkers were randomized to a 24-week IVR self-monitoring program (n = 87) or an assessment-only control condition (n = 98). Baseline interviews assessed outcome predictors including behavioral economic measures of reward preferences (delay discounting, pre-resolution monetary allocation to alcohol vs. savings). Six-month outcomes were categorized as resolved abstinent, resolved nonabstinent, unresolved, or missing. Complier average causal effect (CACE) models examined IVR self-monitoring effects. Results: IVR self-monitoring compliers (?70% scheduled calls completed) were older and had greater pre-resolution drinking control and lower discounting than noncompliers (<70%). A CACE model interaction showed that observed compliers in the IVR group with shorter time horizons (expressed by greater pre-resolution spending on alcohol than savings) were more likely to attain moderation than abstinent resolutions compared with predicted compliers in the control group with shorter time horizons and with all noncompliers. Intention-to-treat analytical models revealed no IVR-related effects. More balanced spending on savings versus alcohol predicted moderation in both approaches. Conclusions: IVR interventions should consider factors affecting IVR utilization and drinking outcomes, including person-specific behavioral economic variables. CACE models provide tools to evaluate interventions involving extended participation. PMID:22630807

  1. Resolution Strategies for the Finite-Element-Based Solution of the ECG Inverse Problem

    PubMed Central

    Kirby, Robert M.; Johnson, Chris R.

    2010-01-01

    Successful employment of numerical techniques for the solution of forward and inverse ECG problems requires the ability to both quantify and minimize approximation errors introduced as part of the discretization process. Our objective is to develop discretization and refinement strategies involving hybrid-shaped finite elements so as to minimize approximation errors for the ECG inverse problem. We examine both the ill-posedness of the mathematical inverse problem and the ill-conditioning of the discretized system in order to propose strategies specifically designed for the ECG inverse problem. We demonstrate that previous discretization and approximation strategies may worsen the properties of the inverse problem approximation. We then demonstrate the efficacy of our strategies on both a simplified and a realistic 2-D torso model. PMID:19535314

  2. The Nonlinear Dynamics of Family Problem Solving in Adolescence: The Predictive Validity of a Peaceful Resolution Attractor

    PubMed Central

    Dishion, Thomas J.; Forgatch, Marion; Van Ryzin, Mark; Winter, Charlotte

    2012-01-01

    In this study we examined the videotaped family interactions of a community sample of adolescents and their parents. Youths were assessed in early to late adolescence on their levels of antisocial behavior. At age 16–17, youths and their parents were videotaped interacting while completing a variety of tasks, including family problem solving. The interactions were coded and compared for 3 developmental patterns of antisocial behavior: early onset, persistent; adolescence onset; and typically developing. The mean duration of conflict bouts was the only interaction pattern that discriminated the 3 groups. In the prediction of future antisocial behavior, parent and youth reports of transition entropy and conflict resolution interacted to account for antisocial behavior at age 18–19. Families with low entropy and peaceful resolutions predicted low levels of youth antisocial behavior at age 18–19. These findings suggest the need to study both attractors and repellers to understand family dynamics associated with health and social and emotional development. PMID:22695152

  3. Multi-resolution Shape Analysis via Non-Euclidean Wavelets: Applications to Mesh Segmentation and Surface Alignment Problems

    PubMed Central

    Kim, Won Hwa; Chung, Moo K.; Singh, Vikas

    2013-01-01

    The analysis of 3-D shape meshes is a fundamental problem in computer vision, graphics, and medical imaging. Frequently, the needs of the application require that our analysis take a multi-resolution view of the shape’s local and global topology, and that the solution is consistent across multiple scales. Unfortunately, the preferred mathematical construct which offers this behavior in classical image/signal processing, Wavelets, is no longer applicable in this general setting (data with non-uniform topology). In particular, the traditional definition does not allow writing out an expansion for graphs that do not correspond to the uniformly sampled lattice (e.g., images). In this paper, we adapt recent results in harmonic analysis, to derive Non-Euclidean Wavelets based algorithms for a range of shape analysis problems in vision and medical imaging. We show how descriptors derived from the dual domain representation offer native multi-resolution behavior for characterizing local/global topology around vertices. With only minor modifications, the framework yields a method for extracting interest/key points from shapes, a surprisingly simple algorithm for 3-D shape segmentation (competitive with state of the art), and a method for surface alignment (without landmarks). We give an extensive set of comparison results on a large shape segmentation benchmark and derive a uniqueness theorem for the surface alignment problem. PMID:24390194

  4. Invertible Program Restructurings for Continuing Modular Maintenance

    E-print Network

    Paris-Sud XI, Université de

    Invertible Program Restructurings for Continuing Modular Maintenance Julien Cohen ASCOLA team (EMN in main- tenance with invertible program transformations. We illustrate this on the typical Expression problems with our approach. Keywords-modular maintenance; restructuring; invertible pro- gram

  5. Landscaping With Maintenance in Mind.

    ERIC Educational Resources Information Center

    Sorensen, Randy

    2000-01-01

    Examines school ground landscape design that enhances attractive of the school and provides for easier maintenance. Landscape design issues discussed include choice of grass, trees, and shrubs; irrigation; and safety and access. Other considerations for lessening maintenance problems for facility managers are also highlighted. (GR)

  6. Systems integration in maintenance engineering

    Microsoft Academic Search

    Andrew Starr; Andrew Ball

    2000-01-01

    Integration in maintenance engineering systems provides a potential solution to some complex and conflicting problems. Decision making is often achieved with uncertainty and unknowns, while measuring against conflicting performance criteria. Maintenance decisions are made in the context of business priorities. Integration must consider the bi-directional flow of data and information into the decision making and planning process at all levels.

  7. Response to Contradiction: Conflict Resolution Strategies Used by Students in Solving Problems of Chemical Equilibrium.

    ERIC Educational Resources Information Center

    Niaz, Mansoor

    2001-01-01

    Illustrates how a novel problem of chemical equilibrium based on a closely related sequence of items can facilitate students' conceptual understanding. Students were presented with a chemical reaction in equilibrium to which a reactant was added as an external effect. Three studies were conducted to assess alternative conceptions. (Author/SAH)

  8. Problems and artifacts of microwave accelerated procedures in neurohistotechnology and resolutions.

    PubMed

    Horobin, R W

    1998-06-01

    Microwaving artifacts in histoprocessing and staining arise from the acceleration of diffusional and reactive processes. Because such accelerations provide the advantages of microwaving, and because microwave ovens cannot distinguish desirable from undesirable accelerations, artifacts are inevitable. Such microwaving problems can be categorized as follows: histoprocessing and staining reagents may be lost or altered; staining targets may move away from their in vivo sites, may be totally lost from the specimen, or may be altered; physical characteristics such as permeability of specimens or embedding resins may be changed; and staining processes themselves are sometimes different at elevated temperatures. The most general tips for detecting and/or avoiding such problems are to monitor and control the temperature of the reagents and the specimen, to standardize the procedures, and to observe the specimen and reagents carefully during microwaving when a new procedure is being introduced to the laboratory. PMID:9654456

  9. Resolution of problems in soft matter dynamics by combining calorimetry and other spectroscopies

    Microsoft Academic Search

    K. L. Ngai; S. Capaccioli; M. Shahin Thayyil; N. Shinyashiki

    2010-01-01

    In several current important problems in different areas of soft matter physics, controversy persists in interpreting the\\u000a molecular dynamics observed by various spectroscopies including dielectric relaxation, light scattering, nuclear magnetic\\u000a resonance, and neutron scattering. Outstanding examples include: (1) relaxation of water in aqueous mixtures, in molecular\\u000a sieves and silica-gel nanopores, and in hydration shell of proteins; and (2) dynamics of

  10. A pressure-based framework for the resolution of multi-fluid flow problems

    NASA Astrophysics Data System (ADS)

    Moukalled, F.; Darwish, M.

    2013-10-01

    Pressure-based methods represent a class of Computational Fluid Dynamics (CFD) algorithms in which pressure, rather than density, is used as a principal variable. This paper presents a review of segregated pressure-based methods and reports on a newly developed fully coupled method for the solution of multi-fluid flow problems. Results indicate the superiority of the coupled solver over the segregated approach.

  11. Genetic variation and its maintenance

    SciTech Connect

    Roberts, D.F.; De Stefano, G.F.

    1986-01-01

    This book contains several papers divided among three sections. The section titles are: Genetic Diversity--Its Dimensions; Genetic Diversity--Its Origin and Maintenance; and Genetic Diversity--Applications and Problems of Complex Characters.

  12. High-resolution SNP and haplotype maps of the human gamma-glutamyl carboxylase gene (GGCX) and association study between polymorphisms in GGCX and the warfarin maintenance dose requirement of the Japanese population.

    PubMed

    Cha, Pei-Chieng; Mushiroda, Taisei; Takahashi, Atsushi; Saito, Shigeru; Shimomura, Hideki; Suzuki, Takao; Kamatani, Naoyuki; Nakamura, Yusuke

    2007-01-01

    Gamma-glutamyl carboxylase (GGCX) plays an important role in blood coagulation through post-translational carboxylation of vitamin K-dependent blood-clotting proteins. This carboxylation process is impaired in the presence of warfarin, a vitamin K antagonist. Recent studies on GGCX have provided insights into association of polymorphisms in this gene, with inter-individual differences in the required warfarin maintenance dose. In order to provide a useful resource for further elucidating this association, we here report a high-resolution single nucleotide polymorphism (SNP) and haplotype maps of an 18-kb genomic region corresponding to the GGCX locus in the Japanese population. Among 41 SNPs, seven insertion/deletion polymorphisms, and a microsatellite polymorphism that we detected by direct sequencing of the DNAs of 96 Japanese individuals who were treated with warfarin, 32 genetic variations have not been reported. Using genotype information from 12 SNPs and the EM algorithm, we estimated haplotypes for this genomic region. Subsequently, we investigated associations of each of these polymorphisms with the warfarin maintenance-dose requirements of 828 Japanese patients, including the 96 patients that were used for DNA sequencing. We found no significant association between the polymorphisms in GGCX and the dose requirement. PMID:17786385

  13. High-resolution coupled physics solvers for analysing fine-scale nuclear reactor design problems.

    PubMed

    Mahadevan, Vijay S; Merzari, Elia; Tautges, Timothy; Jain, Rajeev; Obabko, Aleksandr; Smith, Michael; Fischer, Paul

    2014-08-01

    An integrated multi-physics simulation capability for the design and analysis of current and future nuclear reactor models is being investigated, to tightly couple neutron transport and thermal-hydraulics physics under the SHARP framework. Over several years, high-fidelity, validated mono-physics solvers with proven scalability on petascale architectures have been developed independently. Based on a unified component-based architecture, these existing codes can be coupled with a mesh-data backplane and a flexible coupling-strategy-based driver suite to produce a viable tool for analysts. The goal of the SHARP framework is to perform fully resolved coupled physics analysis of a reactor on heterogeneous geometry, in order to reduce the overall numerical uncertainty while leveraging available computational resources. The coupling methodology and software interfaces of the framework are presented, along with verification studies on two representative fast sodium-cooled reactor demonstration problems to prove the usability of the SHARP framework. PMID:24982250

  14. Using Truth Maintenance Systems: A Tutorial

    Microsoft Academic Search

    Mladen Stanojevic; Sanja Vranes; Dusan M. Velasevic

    1994-01-01

    Truth maintenance (also called belief revision or reason maintenance) is an area of AI concerned with revising sets of beliefs and maintaining the truth in the system when new information contradicts existing information. Truth maintenance systems (TMSs) work with inference engines that act as problem solvers within large search spaces. The inference engine explores alternatives, makes choices, and examines the

  15. Support-assisted optical superresolution of low-resolution image sequences: the one-dimensional problem.

    PubMed

    Prasad, Sudhakar; Luo, Xuan

    2009-12-01

    We analyze the problem of optical superresolution (OSR) of a one-dimensional (1D) incoherent spatial signal from undersampled data when the support of the signal is known in advance. The present paper corrects and extends our previous work on the calculation of Fisher information (FI) and the associated Cramer-Rao lower bound (CRB) on the minimum error for estimating the signal intensity distribution and its Fourier components at spatial frequencies lying beyond the optical band edge. The faint-signal and bright-signal limits emerge from a unified noise analysis in which we include both additive noise of detection and shot noise of photon counting via an approximate Gaussian statistical distribution. For a large space-bandwidth product, we derive analytical approximations to the exact expressions for FI and CRB in the faint-signal limit and use them to argue why achieving any significant amount o unbiased bandwidth extension in the presence of noise is a uniquely challenging proposition. Unlike previous theoretical work on the subject of support-assisted bandwidth extension, our approach is not restricted to specific forms of the system transfer functions, and provides a unified analysis of both digital and optical superresolution of undersampled data. PMID:20052248

  16. Solutions of the Taylor-Green Vortex Problem Using High-Resolution Explicit Finite Difference Methods

    NASA Technical Reports Server (NTRS)

    DeBonis, James R.

    2013-01-01

    A computational fluid dynamics code that solves the compressible Navier-Stokes equations was applied to the Taylor-Green vortex problem to examine the code s ability to accurately simulate the vortex decay and subsequent turbulence. The code, WRLES (Wave Resolving Large-Eddy Simulation), uses explicit central-differencing to compute the spatial derivatives and explicit Low Dispersion Runge-Kutta methods for the temporal discretization. The flow was first studied and characterized using Bogey & Bailley s 13-point dispersion relation preserving (DRP) scheme. The kinetic energy dissipation rate, computed both directly and from the enstrophy field, vorticity contours, and the energy spectra are examined. Results are in excellent agreement with a reference solution obtained using a spectral method and provide insight into computations of turbulent flows. In addition the following studies were performed: a comparison of 4th-, 8th-, 12th- and DRP spatial differencing schemes, the effect of the solution filtering on the results, the effect of large-eddy simulation sub-grid scale models, and the effect of high-order discretization of the viscous terms.

  17. The SNM1B/APOLLO DNA nuclease functions in resolution of replication stress and maintenance of common fragile site stability

    PubMed Central

    Mason, Jennifer M.; Das, Ishita; Arlt, Martin; Patel, Neil; Kraftson, Stephanie; Glover, Thomas W.; Sekiguchi, JoAnn M.

    2013-01-01

    SNM1B/Apollo is a DNA nuclease that has important functions in telomere maintenance and repair of DNA interstrand crosslinks (ICLs) within the Fanconi anemia (FA) pathway. SNM1B is required for efficient localization of key repair proteins, such as the FA protein, FANCD2, to sites of ICL damage and functions epistatically to FANCD2 in cellular survival to ICLs and homology-directed repair. The FA pathway is also activated in response to replication fork stalling. Here, we sought to determine the importance of SNM1B in cellular responses to stalled forks in the absence of a blocking lesion, such as ICLs. We found that depletion of SNM1B results in hypersensitivity to aphidicolin, a DNA polymerase inhibitor that causes replication stress. We observed that the SNM1B nuclease is required for efficient localization of the DNA repair proteins, FANCD2 and BRCA1, to subnuclear foci upon aphidicolin treatment, thereby indicating SNM1B facilitates direct repair of stalled forks. Consistent with a role for SNM1B subsequent to recognition of the lesion, we found that SNM1B is dispensable for upstream events, including activation of ATR-dependent signaling and localization of RPA, ?H2AX and the MRE11/RAD50/NBS1 complex to aphidicolin-induced foci. We determined that a major consequence of SNM1B depletion is a marked increase in spontaneous and aphidicolin-induced chromosomal gaps and breaks, including breakage at common fragile sites. Thus, this study provides evidence that SNM1B functions in resolving replication stress and preventing accumulation of genomic damage. PMID:23863462

  18. Heavy-duty diesel vehicle inspection and maintenance study. Volume 1. Summary report; Volume 2. Quantifying the problem; Volume 3. Development and validation of I\\/M (inspection and maintenance) test procedures; Volume 4. I\\/M program design and cost-effectiveness analysis. Final report, June 1985May 1988

    Microsoft Academic Search

    C. S. Weaver; R. F. Klausmeier

    1988-01-01

    Heavy-duty vehicles are major contributors to ambient levels of particulate matter and oxides of nitrogen in urban air. Implementation of an Inspection and Maintenance (I\\/M) program for heavy-duty diesel vehicles has been impeded by the technical difficulty of developing a suitable emissions test, and by uncertainty as to the magnitude of the problem and of the cost-effectiveness of an I\\/M

  19. Design and maintenance of a network for collecting high-resolution suspended-sediment data at remote locations on rivers, with examples from the Colorado River

    USGS Publications Warehouse

    Griffiths, Ronald E.; Topping, David J.; Andrews, Timothy; Bennett, Glenn E.; Sabol, Thomas A.; Melis, Theodore S.

    2012-01-01

    Management of sand and finer sediment in fluvial settings has become increasingly important for reasons ranging from endangered-species habitat to transport of sediment-associated contaminants. In all rivers, some fraction of the suspended load is transported as washload, and some as suspended bed material. Typically, the washload is composed of silt-and-clay-size sediment, and the suspended bed material is composed of sand-size sediment. In most rivers, as a result of changes in the upstream supply of silt and clay, large, systematic changes in the concentration of the washload occur over time, independent of changes in water discharge. Recent work has shown that large, systematic, discharge-independent changes in the concentration of the suspended bed material are also present in many rivers. In bedrock canyon rivers, such as the Colorado River in Grand Canyon National Park, changes in the upstream tributary supply of sand may cause large changes in the grain-size distribution of the bed sand, resulting in changes in both the concentration and grain-size distribution of the sand in suspension. Large discharge-independent changes in suspended-sand concentration coupled to discharge-independent changes in the grain-size distribution of the suspended sand are not unique to bedrock canyon rivers, but also occur in large alluvial rivers, such as the Mississippi River. These systematic changes in either suspended-silt-and-clay concentration or suspended-sand concentration may not be detectable by using conventional equal-discharge- or equal-width-increment measurements, which may be too infrequently collected relative to the time scale over which these changes in the sediment load are occurring. Furthermore, because large discharge-independent changes in both suspended-silt-and-clay and suspended-sand concentration are possible in many rivers, methods using water discharge as a proxy for suspended-sediment concentration (such as sediment rating curves) may not produce sufficiently accurate estimates of sediment loads. Finally, conventional suspended-sediment measurements are both labor and cost intensive and may not be possible at the resolution required to resolve discharge-independent changes in suspended-sediment concentration, especially in more remote locations. For these reasons, the U.S. Geological Survey has pursued the use of surrogate technologies (such as acoustic and laser diffraction) for providing higher-resolution measurements of suspended-sediment concentration and grain size than are possible by using conventional suspended-sediment measurements alone. These factors prompted the U.S. Geological Survey's Grand Canyon Monitoring and Research Center to design and construct a network to automatically measure suspended-sediment transport at 15-minute intervals by using acoustic and laser-diffraction surrogate technologies at remote locations along the Colorado River within Marble and Grand Canyons in Grand Canyon National Park. Because of the remoteness of the Colorado River in this reach, this network also included the design of a broadband satellite-telemetry system to communicate with the instruments deployed at each station in this network. Although the sediment-transport monitoring network described in this report was developed for the Colorado River in Grand Canyon National Park, the design of this network can easily be adapted for use on other rivers, no matter how remote. In the Colorado River case-study example described in this report, suspended-sediment concentration and grain size are measured at five remote stations. At each of these stations, surrogate measurements of suspended-sediment concentration and grain size are made at 15-minute intervals using an array of different single-frequency acoustic-Doppler side-looking profilers. Laser-diffraction instruments are also used at two of these stations to measure both suspended-sediment concentrations and grain-size distributions. Cross-section calibrations of these instruments have been constructed and verified by using either equal-discharge-increment

  20. Integrating preventive maintenance, predictive maintenance, and maintenance technical support

    SciTech Connect

    Leonetti, P.B.

    1992-08-06

    The fundamental tasks of the Oak Ridge Y-12 Plant maintenance operations are planning, scheduling, executing, postmaintenance testing, completing the maintenance job, and supporting these activities with administrative and technical assistance. The Department of Energy (DOE) Maintenance Management Program'' guidelines require that we use a graded approach for applying formality and documentation to these maintenance operations. The most-rigorous controls should be placed on maintaining the most-vital systems, structures, and components (SSCs). We must understand risk assessments in order to evaluate which SSCs are most vital. The product of this assessment process is a well-developed understanding of where to apply the most rigor, formality, and documentation. Once we have determined where, we must determine how to apply maintenance so as to mitigate risk. Fundamental to determining how to apply it is an understanding of the main difference between proactive and reactive (or corrective) maintenance: proactive maintenance is more effective in mitigating risk, establishing reliability, and reducing cost. Proactive (or preventive) maintenance includes all maintenance activities commonly thought of as preventive and predictive maintenance. Predictive maintenance, conversely, is the preferred preventive maintenance (PM) technique because it is founded on the scientific technology of machine-condition monitoring. Proper use of these methods enables a plant to turn from maintenance crisis management'' to planned proactive maintenance management.''

  1. Integrating preventive maintenance, predictive maintenance, and maintenance technical support

    SciTech Connect

    Leonetti, P.B.

    1992-08-06

    The fundamental tasks of the Oak Ridge Y-12 Plant maintenance operations are planning, scheduling, executing, postmaintenance testing, completing the maintenance job, and supporting these activities with administrative and technical assistance. The Department of Energy (DOE) ``Maintenance Management Program`` guidelines require that we use a graded approach for applying formality and documentation to these maintenance operations. The most-rigorous controls should be placed on maintaining the most-vital systems, structures, and components (SSCs). We must understand risk assessments in order to evaluate which SSCs are most vital. The product of this assessment process is a well-developed understanding of where to apply the most rigor, formality, and documentation. Once we have determined where, we must determine how to apply maintenance so as to mitigate risk. Fundamental to determining how to apply it is an understanding of the main difference between proactive and reactive (or corrective) maintenance: proactive maintenance is more effective in mitigating risk, establishing reliability, and reducing cost. Proactive (or preventive) maintenance includes all maintenance activities commonly thought of as preventive and predictive maintenance. Predictive maintenance, conversely, is the preferred preventive maintenance (PM) technique because it is founded on the scientific technology of machine-condition monitoring. Proper use of these methods enables a plant to turn from ``maintenance crisis management`` to ``planned proactive maintenance management.``

  2. Knowledge-based systems maintenance applications (ATE)

    Microsoft Academic Search

    1982-01-01

    Problems faced in electronics maintenance may be amenable to improvement through the use of artificial intelligence techniques. Knowledge-based systems promise improvement in failure diagnosis and cannot duplicate conditions. The applicability of expert systems to the electronics maintenance problem is discussed. It is concluded that continuous improvements in hardware and software operations systems have brought about the substantial realization of ate

  3. On the application of mathematical models in maintenance

    Microsoft Academic Search

    Philip A. Scarf

    1997-01-01

    This paper may be seen as an appeal to maintenance modellers to work with maintenance engineers and managers on real problems. Such collaboration is essential if maintenance modelling is to be accepted within the engineering community. It is also particularly important in the design and building of maintenance management information systems if such systems are to be used to manage

  4. Reaction Control System Thruster Cracking Consultation: NASA Engineering and Safety Center (NESC) Materials Super Problem Resolution Team (SPRT) Findings

    NASA Technical Reports Server (NTRS)

    MacKay, Rebecca A.; Smith, Stephen W.; Shah, Sandeep R.; Piascik, Robert S.

    2005-01-01

    The shuttle orbiter s reaction control system (RCS) primary thruster serial number 120 was found to contain cracks in the counter bores and relief radius after a chamber repair and rejuvenation was performed in April 2004. Relief radius cracking had been observed in the 1970s and 1980s in seven thrusters prior to flight; however, counter bore cracking had never been seen previously in RCS thrusters. Members of the Materials Super Problem Resolution Team (SPRT) of the NASA Engineering and Safety Center (NESC) conducted a detailed review of the relevant literature and of the documentation from the previous RCS thruster failure analyses. It was concluded that the previous failure analyses lacked sufficient documentation to support the conclusions that stress corrosion cracking or hot-salt cracking was the root cause of the thruster cracking and lacked reliable inspection controls to prevent cracked thrusters from entering the fleet. The NESC team identified and performed new materials characterization and mechanical tests. It was determined that the thruster intergranular cracking was due to hydrogen embrittlement and that the cracking was produced during manufacturing as a result of processing the thrusters with fluoride-containing acids. Testing and characterization demonstrated that appreciable environmental crack propagation does not occur after manufacturing.

  5. Software Maintenance Maturity Model (SMmm The software maintenance process model

    E-print Network

    Hayes, Jane E.

    Software Maintenance Maturity Model (SMmm ): The software maintenance process model Alain April1 improvements to the software maintenance standards and introducing a proposed maturity model for daily software maintenance activities: Software Maintenance Maturity Model (SMmm ). The software maintenance function suffers

  6. Quantifying the impact of different ESMF regridding algorithms in a simplified coupled geophysical flow problem as coupled system resolution ratio is varied.

    NASA Astrophysics Data System (ADS)

    Jahn, O.; Hill, C.; Neckels, D.

    2008-12-01

    The Earth System Modeling Framework (ESMF) supports generalized regridding algorithms that are designed for flexibly coupling models at different spatial and temporal scales. In the context of atmosphere ocean modeling these ESMF capabilities provide a solid basis for coupled experiments in which atmosphere and ocean components are configured independently with significant differences in spatial and temporal resolution. In these scenarios the choice of regridding method can introduce numerical artifacts. In this talk we look at the impact of different ESMF regridding algorithms in a range of idealized scenarios in order to develop guidance on when one regridding algorithm should be favored over another. The results provide useful pointers for coupled experiments connecting atmospheric and ocean simulations on different meshes and at different resolutions. Our approach uses the classic Stommel ocean gyre problem as its basis. In this problem an ocean gyre is driven by surface wind-stress and the equilibrated solution is a balance between vorticity input from the wind and dissipation due to mixing and boundary drag. For our study we configure an MITgcm ocean ESMF component and a pseudo atmosphere ESMF component that maps an analytical wind stress to an arbitrary numerical mesh. Using different ESMF regridding schemes we vary the ratio of the atmosphere to ocean mesh resolution and the absolute ocean resolution. The results clearly illustrate the benefits of preserving C2 or greater continuity in interpolation schemes for problems where the ratio of mesh resolutions is large. Finally we repeat selected experiments for a, simple geometry, global ocean simulation, showing how the same rules hold. This work illustrate the flexibility now available in ESMF and assesses accuracy and computational cost trade offs and inherent biases associated with interpolation algorithm selection.

  7. LABORATORY MAINTENANCE OF PATHOGENIC LEPTOSPIRA

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Analysis of Leptospira requires use of specialized media for growth, maintenance, and storage of viable bacteria that can be used in experimental protocols in a predictable manner. However, pathogenic Leptospira are fastidious bacteria with unusual nutritional requirements. These problems make pri...

  8. Delays and safety in airline maintenance

    Microsoft Academic Search

    M. Sachon; E. Paté-Cornell

    2000-01-01

    Airline maintenance operations affect the potential for flight delays and can also affect flight safety if signals of technical problems are missed or misinterpreted. In this paper, we use a probabilistic risk analysis model, represented by an influence diagram, to quantify the effect of an airline's maintenance policy on delays, cancellations and in-flight safety. The model represents the leading edge

  9. A new Ellipsoidal Gravimetric-Satellite Altimetry Boundary Value Problem; Case study: High Resolution Geoid of Iran

    Microsoft Academic Search

    A. Ardalan; A. Safari; E. Grafarend

    2003-01-01

    A new ellipsoidal gravimetric-satellite altimetry boundary value problem has been developed and successfully tested. This boundary value problem has been constructed for gravity observables of the type (i) gravity potential (ii) gravity intensity (iii) deflection of vertical and (iv) satellite altimetry data. The developed boundary value problem is enjoying the ellipsoidal nature and as such can take advantage of high

  10. Transit-bus maintenance

    SciTech Connect

    Purdy, J.E.; Wiegmann, J.D.; Maze, T.H.; Cook, A.R.; List, G.

    1987-01-01

    The 4 papers in the report deal with the following areas; vehicle maintenance: cost relationship and estimating methodology; theory and practice of transit-bus maintenance performance measurement; bus maintenance performance indicators; historical development and current practice; and terrain effects on bus-maintenance performance.

  11. Maintenance of water and food quality in the stabilization forces area of operations: German surveillance laboratories and the problem of expired field rations.

    PubMed

    Spieler, P; Petersen, H

    2000-05-01

    The medical services of the German contingent of the Stabilization Forces in Bosnia maintain a high-standard-preventive health care system. Because knowledge about German food and water surveillance laboratories is not widespread, these and the methods used for sample examinations as well as their analytical capacities are introduced. From July to November 1998, we examined 168 food samples. Three percent of them were considered unsafe for consumption as a result of microbiological contamination. None was considered unsafe for chemical reasons. Consequently, only one case of suspected food-borne infection occurred. Similar results were found when we examined water quality. Generally, microbiological contamination was low. One sample of mineral water (0.5%) was considered unsafe for consumption for chemical reasons. These findings suggest a high-quality standard of food and water supply for the Stabilization Forces in Bosnia. The maintenance of this level is an important aim of the German preventive health care system. PMID:10826380

  12. Deferred Maintenance Strategies You Must Try.

    ERIC Educational Resources Information Center

    Sturgeon, Julie

    2000-01-01

    Discusses how some college administrators have found "over-the-counter" cures for deferred maintenance problems resulting from budgeting shortfalls. Catch-up approaches discussed include those involving planning, prioritizing, partnering, and gift giving. (GR)

  13. Implementation of Maintenance Decision for Equipment Considering Condition Monitoring Information

    Microsoft Academic Search

    Ding Feng; He Zhengjia

    2010-01-01

    To solve the problem of conventional maintenance decision method for failing to fully utilize large amounts of information of the same kind systems and less current system state information, the key procedure of proactive maintenance decision based on condition monitoring information is established. A novel maintenance decision method based on proportional hazard models algorithm orienting operational state information is proposed.

  14. Rationale Support for Maintenance of Large Scale Systems

    Microsoft Academic Search

    Janet E. Burge; David C. Brown

    2003-01-01

    Software maintenance has long been one of the most difcult and expensive phases of the software life-cycle. Maintenance is especially difcult for large-scale systems. The more code involved, the larger the chance that there may be unexpected interactions that may cause problems when updates and corrections are made during maintenance. The large number of developers who were probably involved at

  15. Maintenance anomalies in rule-based expert systems

    Microsoft Academic Search

    Richard C. Hicks

    1993-01-01

    Maintenance has been identified as a major difficulty in expert system implementations. Maintenance on XCON: a 17,500 rule system (in 1988), requires that half of the code be rewritten annually (V.E. Barker and D.E. O'Connor, 1989). Surprisingly, the problem of maintenance has only recently begun to receive attention in expert system research. The author introduces the concept of maintenance anomalies

  16. Facilities maintenance handbook

    NASA Technical Reports Server (NTRS)

    1991-01-01

    This handbook is a guide for facilities maintenance managers. Its objective is to set minimum facilities maintenance standards. It also provides recommendations on how to meet the standards to ensure that NASA maintains its facilities in a manner that protects and preserves its investment in the facilities in a cost-effective manner while safely and efficiently performing its mission. This handbook implements NMI 8831.1, which states NASA facilities maintenance policy and assigns organizational responsibilities for the management of facilities maintenance activities on all properties under NASA jurisdiction. It is a reference for facilities maintenance managers, not a step-by-step procedural manual. Because of the differences in NASA Field Installation organizations, this handbook does not assume or recommend a typical facilities maintenance organization. Instead, it uses a systems approach to describe the functions that should be included in any facilities maintenance management system, regardless of its organizational structure. For documents referenced in the handbook, the most recent version of the documents is applicable. This handbook is divided into three parts: Part 1 specifies common definitions and facilities maintenance requirements and amplifies the policy requirements contained in NMI 8831. 1; Part 2 provides guidance on how to meet the requirements of Part 1, containing recommendations only; Part 3 contains general facilities maintenance information. One objective of this handbook is to fix commonality of facilities maintenance definitions among the Centers. This will permit the application of uniform measures of facilities conditions, of the relationship between current replacement value and maintenance resources required, and of the backlog of deferred facilities maintenance. The utilization of facilities maintenance system functions will allow the Centers to quantitatively define maintenance objectives in common terms, prepare work plans, and develop management information in order to statistically identify and analyze variances from those plans. It will also add credibility to the NASA facilities maintenance budgeting process. The key to a successful maintenance program is the understanding and support of the senior Center managers.

  17. Graphics processing unit implementation of the maximum likelihood solution to the inverse problem for retrieval of geophysical parameters from high-resolution sounder data

    NASA Astrophysics Data System (ADS)

    Wei, Shih-Chieh; Huang, Bormin; Huang, Hung-Lung Allen

    2014-01-01

    The radiative transfer equation (RTE) describes the sounder observed radiance as a result of contribution from various surface properties, atmospheric temperature, and absorbing gas profiles. Retrieval of these geophysical parameters from the sounder data requires an inverse solution to the RTE problem. In the presence of noise in observation data, the maximum likelihood method is often used to find the most probable solution from an ensemble described by a probability density function. In recent years, general purpose graphics processing units with hundreds of computing cores have become more affordable for scientific computation. This work will explore the use of GPU in speedup of the maximum likelihood solution to the ill-posed retrieval problem. For the infrared atmospheric sounding interferometer high-resolution sounder having 8641 channels, the use of GPU on maximum likelihood estimation shows a promising speedup of 1986× compared to a single-threaded native CPU version.

  18. GPU implementation of the maximum likelihood solution to the inverse problem for retrieval of geophysical parameters from high resolution sounder data

    NASA Astrophysics Data System (ADS)

    Wei, Shih-Chieh; Huang, Bormin

    2011-09-01

    The radiative transfer equation (RTE) describes the sounder observed radiance as a result of contribution from various surface properties, atmospheric temperature and absorbing gas profiles. Retrieval of these geophysical parameters from the sounder data requires an inverse solution to the RTE problem. In the presence of noise in observation data, the maximum likelihood method is often used to find the most probable solution from an ensemble described by a probability density function. In recent years general purpose graphics processing units with hundreds of computing cores have become more affordable for scientific computation. This work will explore the use of GPU in speedup of the maximum likelihood solution to the ill-posed retrieval problem. For the IASI high resolution sounder having 8641 channels, use of GPU on maximum likelihood estimation shows a promising speedup of 1986x compared to a single threaded native CPU version.

  19. Light Vehicle Preventive Maintenance.

    ERIC Educational Resources Information Center

    Marine Corps Inst., Washington, DC.

    This correspondence course, originally developed for the Marine Corps, is designed to instruct students in the performance of preventive maintenance on motor vehicles. Instructional materials are presented in three chapters as follows: (1) Major Maintenance Areas (maintenance system, tires, batteries, cooling systems, and vehicle lubrication; (2)…

  20. PROBLEMS

    Microsoft Academic Search

    Philippe Geuzaine; Kristoer van der Zee; Charbel Farhat

    A methodology for designing formally second-order time-accurate and yet loosely coupled partitioned procedures for the solution of nonlinear fluid-structure interac- tion (FSI) problems is presented. Its key components are a fluid time-integrator that is provably second-order time-accurate on moving grids, the midpoint rule for advancing in time the solution of the structural dynamics equations of motion, a second-order structure predictor

  1. Inventorying Stressful Life Events as Risk Factors for Psychopathology: Toward Resolution of the Problem of Intracategory Variability

    PubMed Central

    Dohrenwend, Bruce P.

    2006-01-01

    An explosion of research on life events has occurred since the publication of the Holmes and Rahe checklist in 1967. Despite criticism, especially of their use in research on psychopathology, such economical inventories have remained dominant. Most of the problems of reliability and validity with traditional inventories can be traced to the intracategory variability of actual events reported in their broad checklist categories. The purposes of this review are, first, to examine how this problem has been addressed within the tradition of economical checklist approaches; second, to determine how it has been dealt with by far less widely used and far less economical labor-intensive interview and narrative-rating approaches; and, third, to assess the prospects for relatively economical, as well as reliable and valid, solutions. PMID:16719570

  2. The Riemann problem and a high-resolution Godunov method for a model of compressible two-phase flow

    Microsoft Academic Search

    D. W. Schwendeman; C. W. Wahle; A. K. Kapila

    2006-01-01

    This paper considers the Riemann problem and an associated Godunov method for a model of compressible two-phase flow. The model is a reduced form of the well-known Baer–Nunziato model that describes the behavior of granular explosives. In the analysis presented here, we omit source terms representing the exchange of mass, momentum and energy between the phases due to compaction, drag,

  3. Maintenance as a safety issue.

    PubMed

    White, Jim

    2008-11-01

    Because safety is related to electrical power systems maintenance, it seems reasonable to assume there could be legal issues if maintenance is not performed. OSHA has not yet taken the stand that not performing maintenance as required by the manufacturer, NFPA 70B, or ANSI/NETA MTS-07 constitutes a willful violation. OSHA defines a willful citation as one where: "the employer knowingly commits with plain indifference to the law. The employer either knows that what he or she is doing constitutes a violation, or is aware that a hazardous condition existed and made no reasonable effort to eliminate it". However, NFPA 70E 2009 requires this maintenance, and OSHA has stated on its Web site that NFPA 70E is "a guide for meeting the requirements of the OSHA electrical regulations". In addition, federal courts have found that NFPA 70E is "standard industry practice." Once a company receives and accepts a willful citation, especially if received as the result of an accident investigation, its worker's compensation protection no longer shields it. One definition given by a trial attorney for a willful citation was that it is equal to negligent behavior. Be smart: Maintain that equipment and save yourself major problems, including unscheduled shutdowns and possible litigation. PMID:19025196

  4. Offshore maintenance reduces cost and downtime

    SciTech Connect

    Danahy, J.W.

    1983-08-01

    Maintenance is the single activity offshore that can have the most impact on productivity, safety, and downtime. Unfortunately, unless it is well organized, maintenance may be carried out according to unchanging and often unnecessary routines. Overly rigid maintenance procedures, that are viewed by crews as ''makework'' assignments, are not conducive to quality or to failure-proof operation of key rig systems. An alternate system of maintenance, which Keydril has adopted on all its rigs, is designed to circumvent the problems of crew attitude and at the same time provide an effective preventive program that simply and efficiently manages all of the rig's operational requirements. The program consists of detailed maintenance and test procedures which are based on frequency analyses of the operating profiles of each piece of machinery. Keydril calls the program an Engineered Approach to Maintenance. The heart of the engineered approach system is a color-coded visual display of maintenance requirement cards (T-cards). These cards assign and describe specific tasks according to an analysis of the operating history of the unit itself and analyses of similar equipment on other company rigs. The second part of the engineered system is the use of high-technology testing methods that can remotely analyze various operating parameters and give early warning of equipment wear prior to failure. The equipment on board Keydril's rigs must be used, and rig personnel have to know that it will always work at satisfactory performance levels. The engineered approach to maintenance provides that assurance.

  5. Raj JainThe Ohio State University Address ResolutionAddress ResolutionAddress ResolutionAddress Resolution

    E-print Network

    Jain, Raj

    Raj JainThe Ohio State University 15-1 Address ResolutionAddress ResolutionAddress ResolutionAddress@CIS.Ohio-State.Edu http://www.cis.ohio-state.edu/~jain/ #12;Raj JainThe Ohio State University 15-2 u Address resolution problem u Address resolution techniques u ARP protocol u Proxy ARP, Reverse ARP, and Inverse ARP Overview

  6. Maintenance policy designs for PC manufacturers

    Microsoft Academic Search

    Yu-Ting Lin; Tony Ambler

    2005-01-01

    The cost of field service has significantly increased the need for design for maintainability (DFM). How to decide which maintenance policy should be performed is one of the service cost reduction problems. Exploiting the knowledge-based technology as well as the multi-objective analysis, this paper presents a decision tree selecting model (DTSM) for alternative maintenance policies, and further, develops a weight-based

  7. Decelerating Flows in TeV Blazars: A Resolution to the BL Lac -- FR I Unification Problem

    NASA Technical Reports Server (NTRS)

    Kazanas, Demosthenes

    2005-01-01

    TeV emission from BL Lacertae (BL) objects i s commonly modeled as Synchrotron-Self Compton (SSC) radiation from relativistically moving homogeneous plasma blobs. In the context of these models, the blob Lorentz factors needed to reproduce the corrected for absorption by the diffuse IR background (DIRB) TeV emission are large ($\\delta \\gtrsim 50$). The main reason for this is that stronger beaming eases the problem of the lack of $\\sim$ IR-UV synchrotron seed photons needed to produce the de-absorbed $\\sim $ few TeV peak of the spectral energy distribution (SED). However, such high Doppler factors are in strong disagreement with the unified scheme, according to which BLs are FR I radio galaxies with their jets closely aligned to the line of sight. Here, motivated by the detection of sub-luminal velocities in the sub-pc scale jets of the best studied TeV blazars, MKN 421 and MKN 501, we examine the possibility that the relativistic flows in the TeV BLs decelerate. In this case, the problem of the missing seed photons is solved because of Upstream Compton (UC) scattering, a process in which the upstream energetic electrons from the fast base of the flow 'see' the synchrotron seed photons produced in the slow part of the flow relativistically beamed. Modest Lorentz factors ($\\Gamma \\sim 15$), decelerating down to values compatible with the recent radio interferometric observations, reproduce the $\\sim $ few TeV peak energy of these sources. Furthermore, such decelerating flows are shown to be in agreement with the BL - FR I unification, naturally reproducing the observed BL/FR I broadband luminosity ratios.

  8. Decelerating Flows in TeV Blazars: A Resolution to the BL Lac -- FR I Unification Problem

    E-print Network

    Markos Georganopoulos; Demosthenes Kazanas

    2003-07-23

    TeV emission from BL Lacertae (BL) objects is commonly modeled as Synchrotron-Self Compton (SSC) radiation from relativistically moving homogeneous plasma blobs. In the context of these models, the blob Lorentz factors needed to reproduce the corrected for absorption by the diffuse IR background (DIRB) TeV emission are large ($\\delta \\gtrsim 50$). The main reason for this is that stronger beaming eases the problem of the lack of $\\sim$ IR-UV synchrotron seed photons needed to produce the de-absorbed $\\sim $ few TeV peak of the spectral energy distribution (SED). However, such high Doppler factors are in strong disagreement with the unified scheme, according to which BLs are FR I radio galaxies with their jets closely aligned to the line of sight. Here, motivated by the detection of sub-luminal velocities in the sub-pc scale jets of the best studied TeV blazars, MKN 421 and MKN 501, we examine the possibility that the relativistic flows in the TeV BLs decelerate. In this case, the problem of the missing seed photons is solved because of Upstream Compton (UC) scattering, a process in which the upstream energetic electrons from the fast base of the flow `see' the synchrotron seed photons produced in the slow part of the flow relativistically beamed. Modest Lorentz factors ($\\Gamma \\sim 15$), decelerating down to values compatible with the recent radio interferometric observations, reproduce the $\\sim $ few TeV peak energy of these sources. Furthermore, such decelerating flows are shown to be in agreement with the BL - FR I unification, naturally reproducing the observed BL/FR I broad band luminosity ratios.

  9. Research on the condition based maintenance decision of equipment in power plant

    Microsoft Academic Search

    Yu-Liang Dong; Yu-Jiong Gu; Kun Yang

    2004-01-01

    Aiming at the problem that the condition information of the equipment in power plant is seldom considered during making maintenance decision and as a result insufficiency or surplus of maintenance occurs often, a model of condition based maintenance decision is proposed. Based on system division, the criticality of equipment in same level is evaluated and maintenance strategies of equipment are

  10. A Study on Machine Maintenance Scheduling Using Distributed Cooperative Approach

    NASA Astrophysics Data System (ADS)

    Tsujibe, Akihisa; Kaihara, Toshiya; Fujii, Nobutada; Nonaka, Youichi

    In this study, we propose a distributed cooperative scheduling method, and apply the method into a machine maintenance scheduling problem in re-entrant production systems. As one of the distributed cooperative scheduling methods, we focus on Lagrangian decomposition and coordination (LDC) method, and formulate the machine maintenance scheduling problem with LDC so as to improve computational efficiency by decomposing an original scheduling problem into several sub-problems. The derived solutions by solving the decomposed dual problem are converted into feasible solutions with a heuristic procedure applied in this study. The proposed approach regards maintenance as job with starting and finishing time constraints, so that product and maintenance schedule can realize proper maintenance operations without losing productivity. We show the effectiveness of the proposed method in several simulation experiments.

  11. Review of maintenance personnel practices at nuclear power plants

    SciTech Connect

    Chockie, A.D.; Badalamente, R.V.; Hostick, C.J.; Vickroy, S.C.; Bryant, J.L.; Imhoff, C.H.

    1984-05-01

    As part of the Nuclear Regulatory Commission (NRC) sponsored Maintenance Qualifications and Staffing Project, the Pacific Northwest Laboratory (PNL) has conducted a preliminary assessment of nuclear power plant (NPP) maintenance practices. As requested by the NRC, the following areas within the maintenance function were examined: personnel qualifications, maintenance training, overtime, shiftwork and staffing levels. The purpose of the assessment was to identify the primary safety-related problems that required further analysis before specific recommendations can be made on the regulations affecting NPP maintenance operations.

  12. MAINTENANCE ENGINEERING BUREAU USING MAINTENANCE DATA TO DRIVE IMPROVEMENT

    Microsoft Academic Search

    S Safi; B Bigdeli

    Summary: This paper presents an objective methodology for maintenance data analysis. The purposes of these analyses are to identify strengths and weaknesses in the maintenance management system, opportunities for improvements, and benchmark maintenance key elements against maintenance best practice. A wide range of reports can be provided from analysing the data from computerised maintenance management systems. These reports can be

  13. Software Maintenance Maturity Model (SMmm): the software maintenance process model

    Microsoft Academic Search

    Alain April; Jane Huffman Hayes; Alain Abran; Reiner R. Dumke

    2005-01-01

    SUMMARY We address the assessment and improvement of the software maintenance function by proposing improvements to the software maintenance standards and introducing a proposed maturity model for daily software maintenance activities: Software Maintenance Maturity Model (SMmm). The software maintenance function suffers from a scarcity of management models to facilitate its evaluation, management, and continuous improvement. The SMmm addresses the unique

  14. FACILITIES MAINTENANCE MAIN WAREHOUSE

    E-print Network

    Hemmers, Oliver

    FACILITIES MAINTENANCE MAIN WAREHOUSE Workload Measurement, Validation, and Process Analysis, and process analysis/improvement study be conducted in the Facilities Maintenance Main Warehouse. This study was conducted from 15 February ­ 30 April 2007. Mr. Storlie is the process owner for the main warehouse. 2

  15. Fixing Maintenance Productivity.

    ERIC Educational Resources Information Center

    Fickes, Michael

    2003-01-01

    Describes how one university's facility managers use Nextel communications technology in conjunction with a Famis Software maintenance management system to improve the productivity of its maintenance technicians. The system uses a wireless Internet connection to automate the flow of work order information to and from technicians. The key to these…

  16. Maximizing Hard Floor Maintenance.

    ERIC Educational Resources Information Center

    Steger, Michael

    2000-01-01

    Explains the maintenance options available for hardwood flooring that can help ensure long life cycles and provide inviting spaces. Developing a maintenance system, knowing the type of traffic that the floor must endure, using entrance matting, and adhering to manufacturers guidelines are discussed. Daily, monthly or quarterly, and long-term…

  17. Guideline to good practices for maintenance history at DOE nuclear facilities

    SciTech Connect

    Not Available

    1994-06-01

    Purpose of this guideline is to provide contractor maintenance organizations with information for developing and implementing comprehensive, readily retrievable, information on item maintenance and critical parameters essential to effective maintenance planning, safe and reliable first-effort workmanship, trending, problem analysis, and knowledge-based management decisions. This document is an example guideline for the implementation of DOE Order 4330.4A, Maintenance Management Program, Chapter II, Element 16, Maintenance History.

  18. Aviation Maintenance Alerts

    NSDL National Science Digital Library

    The FAA has published monthly aviation maintenance alerts online for the past 10 years. This site is of particular interests for those studying or teaching aviation maintenance, as it will provide users with up to date maintenance alerts. The alerts contain critical reports that regard manufacturing defects or design flaws, along with any known solutions to the issues. In addition to alerts, visitors can find out how to report safety issues, as well as obtain information on aircraft safety programs funded by the FAA.

  19. Care and Maintenance.

    ERIC Educational Resources Information Center

    Hampton, Carolyn H.; Hampton, Carol D.

    1979-01-01

    The classroom care and maintenance of terrestrial isopods is described. Includes illustrations of isopod external anatomy, a potato trap for collecting isopods, and a constructed habitat for raising isopods. (MA)

  20. Getting into Motorcycle Maintenance

    ERIC Educational Resources Information Center

    Mosher, Lynn

    1978-01-01

    This article tells how to start a high school course in motorcycle maintenance and includes names and addresses of some motorcycle manufacturers and a list of needed tools, equipment, and materials. (MF)

  1. Woodwind Instrument Maintenance.

    ERIC Educational Resources Information Center

    Sperl, Gary

    1980-01-01

    The author presents a simple maintenance program for woodwind instruments which includes the care of tendon corks, the need for oiling keys, and methods of preventing cracks in woodwind instruments. (KC)

  2. Carpet Maintenance Guide.

    ERIC Educational Resources Information Center

    Griffin, William R.

    1999-01-01

    Discusses ways to make carpet maintenance in schools easier and effective for keeping carpeted areas in schools attractive and long lasting. Covers cleaning tips for basic spills, ideas for staying on top of stains, and suggestions for eliminating odors. (GR)

  3. Maintenance scheduling by using simulated annealing method [for power plants

    Microsoft Academic Search

    T. Satoh; K. Nara

    1991-01-01

    The thermal power plant generator maintenance scheduling problem is addressed. The problem is formulated as a mixed-integer programming problem, and it is solved by using an optimization method known as simulated annealing. Since the simulated annealing method assumes an analogy between a physical multiparticle system and a combinatorial optimization problem, a global minimum can be found with high probability through

  4. MAINTENANCE The Aviation Maintenance Technology Program offers an associate of

    E-print Network

    Ickert-Bond, Steffi

    AVIATION MAINTENANCE TECHNOLOGY The Aviation Maintenance Technology Program offers an associate of applied science in aviation maintenance and certificates in airframe, powerplant, or airframe and powerplant maintenance. It is one of the few twelve month Federal Aviation Administration Part-147 certified

  5. Corrective Maintenance Optimization in an Air Force

    Microsoft Academic Search

    Hoong Chuin Lau; Kok Yong NEO; Wee Chong WAN

    2004-01-01

    Successful military mission planning and execution depend critically on equipment serviceability and resupply. Due to the stochastic nature of demands, the forecast of optimal spares and resources needed to guarantee the level of serviceability is a complex problem, especially in a multi-echelon setting. In this paper, we propose a decision-support concept and software tool known as Corrective Maintenance Optimizer (CMO)

  6. Towards a General-Purpose Belief Maintenance System.

    ERIC Educational Resources Information Center

    Falkenhainer, Brian

    This paper addresses the problem of probabilistic reasoning as it applies to Truth Maintenance Systems (TMS). A computer-based Belief Maintenance System (BMS) has been constructed which manages a current set of probabilistic beliefs in much the same way that a TMS manages a set of true/false beliefs. It may be thought of as a generalization of a…

  7. Neuronal Regulation vs Synaptic Unlearning in Memory Maintenance Mechanisms

    E-print Network

    Ruppin, Eytan

    . The problem of spurious states is unimportant in the biologically interesting case of memoriesNeuronal Regulation vs Synaptic Unlearning in Memory Maintenance Mechanisms David Horn and Nir Levy learning, the paradigm of memory formation, needs further mechanisms to guarantee creation and maintenance

  8. APPLICATIONS OF ARTIFICIAL INTELLIGENCE TO CONDITION-BASED MAINTENANCE

    Microsoft Academic Search

    Dayr Reis; Niranjan Pati

    In this paper we discuss interesting developments of expert systems for machine diagnosis and condition-based maintenance. We review some elements of condition-based maintenance and its applications, expert systems for machine diagnosis, and an example of machine diagnosis. In the last section we note some problems to be resolved so that expert systems for machine diagnosis may gain wider acceptance in

  9. Resolution on the population and food equation and the search for rational and efficient solutions to the problem of Third World debt to ensure that the world can eat, 9 September 1989.

    PubMed

    1989-01-01

    In September 1989, the 82nd Inter-Parliamentary Conference passed a resolution "on the population and food equation and the search for rational and efficient solutions to the problem of Third World debt to ensure that the world can eat." This document contains major portions of that resolution. In the area of population, the resolution affirms family planning (FP) as a basic human right and affirms the right of governments to establish their own population policies. Governments are asked to provide the educational opportunities necessary to secure equality and rights for women. Service delivery systems should be improved to make FP accessible to the 300 million women in need. Governments should reduce infant and maternal mortality, promote child care and birth spacing, and increase population education activities. The resolution also states that the creation of peaceful conditions for development is an essential precondition for solving the world's problems. In the area of food, the eradication of hunger is designated one of the primary tasks of the international community. This will only occur when developing countries increase their food production and achieve self-sufficiency. Such action is a basic and primary responsibility of developing countries but creditor nations can provide low interest rates for food import assistance and funds to strengthen the agricultural sector. The resolution further considers the problem of developing country debt and deplores coercive measures applied by certain developed countries against developing countries. The resolution contains many suggestions for reducing debt in developing countries and achieving a more equitable distribution of wealth in the world. In the area of food resources and sustainable development, the resolution acknowledges that protection of the environment and the earth's resource base for future generations is a collective responsibility. Ecological threats to the production of food should be dealt with, industrialized countries should decrease consumption of natural resources, and food production should be ecologically sound. PMID:12344011

  10. Harnessing the power of maintenance

    Microsoft Academic Search

    Toomey

    2006-01-01

    More electric utilities are realizing that structured, comprehensive and proactive maintenance strategies deliver uptime to their bottom line. The article presents four case studies illustrating some of the available solutions to coal and gas-fired plant maintenance. These were: a maintenance strategy review of five coal fired and 22 gas-fired units to identify the importance of equipment along with maintenance tasks;

  11. Resolution in rotation measurements

    Microsoft Academic Search

    Stephen M. Barnett; Roberta Zambrini

    2006-01-01

    The limiting resolution in optical interferometry is set by the number of photons used, with the functional dependence determined by the state of light that is prepared. We consider the problem of measuring the rotation of a beam of light about an optical axis and show how the limiting resolution depends on the total number of quanta of orbital angular

  12. Matching Images with Different Resolutions

    Microsoft Academic Search

    Yves Dufournaud; Cordelia Schmid; Radu Horaud

    2000-01-01

    In this paper we address the problem of matching two images with two different resolutions: a high-resolution im- age and a low-resolution one. On the premise that changes in resolution act as a smoothing equivalent to changes in scale, a scale-space representation of the high-resolution image is produced. Hence the one-to-one classical image matching paradigm becomes one-to-many because the low-

  13. Generation and maintenance of recirculations by Gulf Stream instabilities

    E-print Network

    Beliakova, Natalia Yurievna, 1967-

    1999-01-01

    This thesis studies the problems of generation and maintenance of recirculations by Gulf Stream instabilities. Observations show that the horizontal structure of the jet and its recirculations suffer significant changes ...

  14. Reliability Centered Maintenance - Methodologies

    NASA Technical Reports Server (NTRS)

    Kammerer, Catherine C.

    2009-01-01

    Journal article about Reliability Centered Maintenance (RCM) methodologies used by United Space Alliance, LLC (USA) in support of the Space Shuttle Program at Kennedy Space Center. The USA Reliability Centered Maintenance program differs from traditional RCM programs because various methodologies are utilized to take advantage of their respective strengths for each application. Based on operational experience, USA has customized the traditional RCM methodology into a streamlined lean logic path and has implemented the use of statistical tools to drive the process. USA RCM has integrated many of the L6S tools into both RCM methodologies. The tools utilized in the Measure, Analyze, and Improve phases of a Lean Six Sigma project lend themselves to application in the RCM process. All USA RCM methodologies meet the requirements defined in SAE JA 1011, Evaluation Criteria for Reliability-Centered Maintenance (RCM) Processes. The proposed article explores these methodologies.

  15. Optical Maintenance in PONs

    NASA Astrophysics Data System (ADS)

    Caviglia, Francesco; Di Biase, Valerio C.; Gnazzo, Angelantonio

    1999-10-01

    The maintenance of the ODN (optical distribution network) in PONs (Passive Optical Networks) to be used for the future telecommunication access networks is discussed. A review of the techniques used to perform this function, aimed to guarantee the performances of optical cables, splices, connectors, and other passive components of the network, is provided. Post-fault maintenance (to detect, locate, and restore the faults) and preventive maintenance (to reduce the fault events) are both considered. The use of measuring and monitoring systems based on OTDRs (optical time domain reflectometers) is examined in detail, considering the different proposed schemes. These are based on reference reflectors set at the end of the branches, fiber selectors, wavelength division routing, chained branches, and use of dedicated fibers. An overview of the key components for the considered measuring and monitoring systems is given, considering the present status and the foreseeable evolution for the different devices: optical selectors, filters, reflectors, couplers, selective wavelength routers, and OTDRs.

  16. Maintenance simulation: Software issues

    SciTech Connect

    Luk, C.H.; Jette, M.A.

    1995-07-01

    The maintenance of a distributed software system in a production environment involves: (1) maintaining software integrity, (2) maintaining and database integrity, (3) adding new features, and (4) adding new systems. These issues will be discussed in general: what they are and how they are handled. This paper will present our experience with a distributed resource management system that accounts for resources consumed, in real-time, on a network of heterogenous computers. The simulated environments to maintain this system will be presented relate to the four maintenance areas.

  17. Maintenance of Certification®, Maintenance of Public Trust

    PubMed Central

    Chung, Kevin C.; Clapham, Philip J.; Lalonde, Donald H.

    2010-01-01

    The Maintenance of Certification® (MOC) program has been well received by many physicians, but faced significant opposition from others, who complain that it is overly tedious, costly, and irrelevant to their practice. This article offers a consolidated and concise history of the MOC program and a summary of what plastic surgeons need to know to successfully complete the American Board of Plastic Surgery’s (ABPS) own MOC requirements. The authors have justified each step of the ABPS’s MOC process in terms of how it improves the quality of care delivered to Plastic Surgery patients. Finally, a summary of research is presented that demonstrates both that the public supports the MOC process for all physicians and that continuing education and formal assessment and improvement initiatives have been linked in multiple studies to a better and more evidence-based medical practice. PMID:21285803

  18. Software Development Practices, Software Complexity, and Software Maintenance Performance: A Field Study

    Microsoft Academic Search

    Rajiv D. Banker; Gordon B. Davis; Sandra A. Slaughter

    Software maintenance claims a large proportion of organizational resources. It is thought that many maintenance problems derive from inadequate software design and development practices. Poor design choices can result in complex software that is costly to support and difficult to change. However, it is difficult to assess the actual maintenance performance effects of software development practices because their impact is

  19. Software Development Practices, Software Complexity, and Software Maintenance Performance: A Field Study

    Microsoft Academic Search

    Rajiv D. Banker; Gordon B. Davis; Sandra A. Slaughter

    1998-01-01

    Software maintenance claims a large proportion of organizational resources. It is thought that many maintenance problems derive from inadequate software design and development practices. Poor design choices can result in complex software that is costly to support and difficult to change. However, it is difficult to assess the actual maintenance performance effects of software development practices because their impact is

  20. Root Cause Systemic Analysis: Improving maintenance performance with System Dynamics and Six Sigma

    Microsoft Academic Search

    Hari Agung Yuniarto; Therese Lawlor-Wright

    2009-01-01

    There are believed to be dynamic and complexity to cause a system vulnerable to fail from functioning; maintenance system is no exception. Existing maintenance strategies, however, overlook this fact by not considering a problem in maintenance as a system in its entirety, as well as not trying to discover true root cause of failure. This common ignorance constitutes reworks of

  1. 234 JAMESTOWN MAINTENANCE LOT

    E-print Network

    Swaddle, John

    ART STUDIO JONES MORTON PBK CIRCLE ROWE HOUSE 234 JAMESTOWN BRIDGES MAINTENANCE LOT ADMISSIONS BLDG PLANT LOT GRIGSBY DRIVE HUNT EWELL CIRCLE SORORITY COURT PRESBYTERIAN 327 RICHMOND DAWSON JAMES BLAIR LOT OLD DOMINION UNIVERSITY CENTER STUDENT HEALTH SWEM SWEM F/S YATES LOT RANDOLPH COMMONS BROOKS ST

  2. Care and Maintenance.

    ERIC Educational Resources Information Center

    Hampton, Carol D.; Hampton, Carolyn H.

    1980-01-01

    Described is a method for bringing the sea into the classroom by setting up a saltwater aquarium. Included is selection of an aquarium, filtering systems, water (whether natural salt or synthetic sea salts), bottom materials, setting up an aquarium, system stabilization, stocking an aquarium, and maintenance of the aquarium. (DS)

  3. Preventive Maintenance Process

    NASA Technical Reports Server (NTRS)

    Ciaruffoli, Veronica; Bramley, Craig; Matteson, Mike

    2001-01-01

    The Preventive Maintenance (PM) program at Stennis Space Center (SSC) evolved from an ineffective and poorly organized state to a highly organized state in which it became capable of tracking equipment, planning jobs with man hour estimates, and supporting outsourcing. This viewgraph presentation traces the steps the program took to improve itself.

  4. Operations and maintenance philosophy

    SciTech Connect

    DUNCAN, G.P.

    1999-10-28

    This Operations and Maintenance (O&M) Philosophy document is intended to establish a future O&M vision, with an increased focus on minimizing worker exposure, ensuring uninterrupted retrieval operations, and minimizing operation life-cycle cost. It is intended that this document would incorporate O&M lessons learned into on-going and future project upgrades.

  5. Industrial Mechanical Maintenance.

    ERIC Educational Resources Information Center

    Hendrix, Laborn J.

    This manual was developed to assist teachers in Oklahoma in preparing students for industrial mechanical maintenance. The materials in this teacher's guide are organized in 14 units of instruction covering the following four areas: receiving and setting equipment; equipment hookup and operation; equipment layout, anchoring, and setup; and…

  6. Sewer Maintenance Manual.

    ERIC Educational Resources Information Center

    Ontario Ministry of the Environment, Toronto.

    Outlined are practices and procedures that should be followed in order to protect and fully realize the benefits of sewer systems and also to maximize service and minimize inconveniences to the public. Written in practical terms, the manual is designed to be of immediate use to municipal employees and others involved in sewer maintenance

  7. Maintenance Crisis vs Solutions.

    ERIC Educational Resources Information Center

    Haggard, Susie

    Industrial maintenance in Northeast Georgia is facing an acute crisis. Contributing factors are economic development that is depleting the work force, aging of the population, downsizing of the military, and lack of technical school graduates. Solutions to the crisis fall into three categories: short-term, mid-term, and long-term. For short-term…

  8. Aviation Maintenance Technician Handbook

    NSDL National Science Digital Library

    This document from SpaceTEC National Aerospace Technical Education Center is one of three handbooks for people preparing for mechanic certification with airframe or powerplant ratings, or both. This particular volume contains information on mathematics, aircraft drawings, weight and balance, aircraft materials, processes and tools, physics, electricity, inspection, ground operations, and FAA regulations governing the certification and work of maintenance technicians.

  9. Home Maintenance Manual.

    ERIC Educational Resources Information Center

    Richmond, Jim; And Others

    This manual, written especially for the Navajo and Hopi Indian Relocation Commission, is a simply worded, step-by-step guide to home maintenance for new homeowners. It can be used for self-study or it can serve as instructional material for a training class on home ownership. The manual is organized in nine sections that cover the following…

  10. Conditioned based maintenance (CBM)

    Microsoft Academic Search

    L. Holguin

    2005-01-01

    The Army's Research Development and Engineering Command's, Aviation Missile Research Development and Engineering Center (AMRDEC) is leading a prognostic and diagnostic revolution to incorporate conditioned based maintenance (CBM) into the U.S. Army's rotorary aircraft programs. By combining the CBM concept with existing AMRDEC diagnostic products and in-house created algorithms, opportunities have arisen for methods of prognosis utilizing data from our

  11. Floors: Care and Maintenance.

    ERIC Educational Resources Information Center

    Post Office Dept., Washington, DC.

    Guidelines, methods and policies regarding the care and maintenance of post office building floors are overviewed in this handbook. Procedures outlined are concerned with maintaining a required level of appearance without wasting manpower. Flooring types and characteristics and the particular cleaning requirements of each type are given along with…

  12. Horticulture: Grounds Maintenance Employee.

    ERIC Educational Resources Information Center

    Sims, James; And Others

    The unit of individualized learning activities is designed to provide training in grounds maintenance. The materials in the unit are divided into two sections. The developmental or preliminary phase (15 pages) is for use by the instructor and includes brief descriptions of the job and of the student population, along with listings of the specific…

  13. Process Technology: Process Maintenance Engineer

    NSDL National Science Digital Library

    In this video adapted from Pathways to Technology, youâ??ll meet Tyrone Walker, who keeps the enormous machines at a Tupperware factory running 24/7/365. Tyrone is a process maintenance engineer. This means he inspects all the parts of a machineâ??s electronics system looking for problems, from the tiniest components to the machine as a whole. Tyrone's community college degree in electronic engineering is key to doing this job, which he loves.The video runs 2:46 and is accompanied by a background essay, standards alignment, and discussion questions. Users who sign up for a free account can save the resource and download the video as well.

  14. Photovoltaic operation and maintenance evaluation

    SciTech Connect

    Conover, K.; Lynette, R. (Lynette (R.) and Associates, Inc., Redmond, WA (USA))

    1989-12-01

    In the last decade, a number of large-scale, grid-connected photovoltaic systems have been installed. In order to assess the operating experience and maintenance requirements of these systems, the Electric Power Research Institute (EPRI) sponsored an evaluation of the operation and maintenance (O M) experience at seven selected photovoltaic installations in the United States. The O M experience of existing facilities will be the foundation for the development and design of future, large-sale commercial photovoltaic generating systems. By looking at the problem characteristics of each of the seven sites monitored, implications for future installations can be drawn. Based on the data analyzed in this project, many system components exhibited a high reliability which indicates that low O M costs are clearly possible for photovoltaic systems. Several of the systems currently operating have O M costs below 1.0 cents per kWh. Estimates of potential O M costs for future installations show that O M expenses will not significantly affect the overall cost of energy from photovoltaic systems. However, additional reductions in O M costs can be achieved most effectively through research concentrated on increasing the reliability of power conditioning units. Although the current generation is not quite ten years old, there appears to be little probability that future O M costs will increase. System reliability and consequent plant availability at existing facilities has also measurably improved. Perhaps the most important lesson learned from the early operating experience is that none of the problems encountered to date appear to pose significant technological barriers. 15 refs., 22 figs., 39 tabs.

  15. AUTOMOTIVE DIESEL MAINTENANCE. PROGRAM OUTLINE.

    ERIC Educational Resources Information Center

    Human Engineering Inst., Cleveland, OH.

    INFORMATIONAL TOPICS COVERED IN THE TEXT MATERIALS AND SELF-INSTRUCTIONAL BRANCH PROGRAMED TRAINING FILMS FOR A 2-YEAR, 55 MODULE PROGRAM IN AUTOMOTIVE DIESEL MAINTENANCE ARE GIVEN. THE 30 MODULES FOR "AUTOMOTIVE DIESEL MAINTENANCE 1" ARE AVAILABLE AS VT 005 655 - VT 005 684, AND THE 25 MODULES FOR "AUTOMOTIVE DIESEL MAINTENANCE 2" ARE AVAILABLE…

  16. Improving software maintenance through measurement

    NASA Technical Reports Server (NTRS)

    Rombach, H. Dieter; Ulery, Bradford T.

    1989-01-01

    A practical approach to improving software maintenance through measurements is presented. This approach is based on general models for measurement and improvement. Both models, their integration, and practical guidelines for transferring them into industrial maintenance settings are presented. Several examples of applications of the approach to real-world maintenance environments are discussed.

  17. Reflective Teaching via a Problem Exploration--Teaching Adaptations--Resolution Cycle: A Mixed Methods Study of Preservice Teachers' Reflective Notes

    ERIC Educational Resources Information Center

    Hayden, H. Emily; Chiu, Ming Ming

    2015-01-01

    We explore development of elementary preservice teachers' reflective practices as they solved problems encountered while teaching in a reading clinic. Written reflections (N = 175) were collected across 8 weeks from 23 preservice teachers and analyzed to investigate relationships among problem exploration, teaching adaptations, and problem

  18. Terminal automation system maintenance

    SciTech Connect

    Coffelt, D.; Hewitt, J. [Engineered Systems Inc., Tempe, AZ (United States)

    1997-01-01

    Nothing has improved petroleum product loading in recent years more than terminal automation systems. The presence of terminal automation systems (TAS) at loading racks has increased operational efficiency and safety and enhanced their accounting and management capabilities. However, like all finite systems, they occasionally malfunction or fail. Proper servicing and maintenance can minimize this. And in the unlikely event a TAS breakdown does occur, prompt and effective troubleshooting can reduce its impact on terminal productivity. To accommodate around-the-clock loading at racks, increasingly unattended by terminal personnel, TAS maintenance, servicing and troubleshooting has become increasingly demanding. It has also become increasingly important. After 15 years of trial and error at petroleum and petrochemical storage and transfer terminals, a number of successful troubleshooting programs have been developed. These include 24-hour {open_quotes}help hotlines,{close_quotes} internal (terminal company) and external (supplier) support staff, and {open_quotes}layered{close_quotes} support. These programs are described.

  19. Multiple Scales and the Maintenance of Biodiversity

    Microsoft Academic Search

    Simon A. Levin

    2000-01-01

    The problem of multiple scales permeates the study of ecological process and pattern, uniting aspects of space, time, and\\u000a organizational complexity. In particular, it supports the maintenance of biological diversity, allowing for the magnification\\u000a of underlying patterns of variation in the physical environment to create many resources from few, through the evolutionary\\u000a diversification of species' niches and life histories. Specialization

  20. Sensor and device diagnostics for predictive and proactive maintenance

    SciTech Connect

    Boynton, B. [Fisher-Rosemount Inc., Eden Prairie, MN (United States)

    1996-07-01

    Financial pressures are increasing in the U.S. Electric Power Industry due to high operational and maintenance expenses. A predictive maintenance program utilizing advanced diagnostics can reduce these operational and maintenance costs. Current diagnostic techniques are generally fault specific and must be tailored to the application needs. If we however, interlink process diagnostics with sensor validation through the use of innovative instrument diagnostics, predictive maintenance takes on a whole new meaning. Diagnostics at the instrument level can predict the residual life of the sensor and date of failure to avoid process shutdown. It can eliminate routine checks and no problem found maintenance labor. Device diagnostics now have the ability to predict failure cause, whether that cause be the process itself or an instrument in the loop. 80% of all service calls could be avoided if the health and life expectancy of the field device and/or sensor were known.

  1. Maintenance of Northern Summer Stationary Waves in a GCM

    Microsoft Academic Search

    Mingfang Ting

    1994-01-01

    The maintenance of northern summer stationary waves is studied with data from a 15-year integration of the general circulation model (GCM) experiment performed at the Geophysical Fluid Dynamics Laboratory. The model has relatively high resolution (rhomboidal 30 wavenumbers, 9 vertical levels) and simulates the summertime stationary waves reasonably well.A steady, linear, baroclinic model is used to understand the various forcing

  2. Resolution in rotation measurements

    E-print Network

    Barnett, S M; Barnett, Stephen M; Zambrini, Roberta

    2005-01-01

    The limiting resolution in optical interferometry is set by the number of photons used, with the functional dependence determined by the state of light that is prepared. We consider the problem of measuring the rotation of a beam of light about an optical axis and show how the limiting resolution depends on the total number of quanta of orbital angular momentum carried by the light beam.

  3. Resolution in rotation measurements

    E-print Network

    Stephen M Barnett; Roberta Zambrini

    2005-03-30

    The limiting resolution in optical interferometry is set by the number of photons used, with the functional dependence determined by the state of light that is prepared. We consider the problem of measuring the rotation of a beam of light about an optical axis and show how the limiting resolution depends on the total number of quanta of orbital angular momentum carried by the light beam.

  4. Quantifying the impact of different ESMF regridding algorithms in a simplified coupled geophysical flow problem as coupled system resolution ratio is varied

    Microsoft Academic Search

    O. Jahn; C. Hill; D. Neckels

    2008-01-01

    The Earth System Modeling Framework (ESMF) supports generalized regridding algorithms that are designed for flexibly coupling models at different spatial and temporal scales. In the context of atmosphere ocean modeling these ESMF capabilities provide a solid basis for coupled experiments in which atmosphere and ocean components are configured independently with significant differences in spatial and temporal resolution. In these scenarios

  5. Revision of certification standards for aviation maintenance personnel

    NASA Technical Reports Server (NTRS)

    Vipond, Leslie K.

    1992-01-01

    Part 65, Subparts D and E, of the Federal Aviation Regulations (FAR) identify the certification requirements for aviation mechanics and aviation repairmen. The training, experience, privileges, ratings, recordkeeping, and currency requirements for aviation maintenance personnel are also addressed by those parts of the FAR. The recent emergence of the aging fleet problem and the introduction of new technologies, aircraft, engines, and aeronautical products has caused certain portions of these rules to become obsolete. Further, international political arrangements, such as bilateral airworthiness and maintenance agreements, International Civil Aviation Organization (ICAO) standards, certain international agreements for maintenance personnel training, and mechanic certificate reciprocity, have all impacted on the current regulatory policy.

  6. Lawn Maintenance Safety 

    E-print Network

    Smith, David

    2005-07-12

    debris and noise. ? Allow the engine to cool before returning it to a storage shed. ? Turn the power off and disconnect the spark plug wire before cleaning, inspecting, adjusting or repairing the cutting blade. Lawn Maintenance Safety ? Don?t run a... gasoline-powered mower inside a storage shed-this could cause carbon monoxide poisoning. ? Never touch the spark plug with your hand or a tool when the mower is running. ? Never leave a running mower unattended, especially when children are nearby...

  7. Categorizing Case-Base Maintenance: Dimensions and Directions

    Microsoft Academic Search

    David B. Leake; David C. Wilson

    1998-01-01

    . Experience with the growing number of large-scale CBR systemshas led to increasing recognition of the importance of case-basemaintenance. Multiple researchers have addressed pieces of the case-basemaintenance problem, considering such issues as maintaining consistencyand controlling case-base growth. However, despite the existence of thesecases of case-base maintenance, there is no general framework of dimensionsfor describing case-base maintenance systems. Such a frameworkwould

  8. A hybrid fuzzy group decision making and factor analysis for selecting maintenance strategy

    Microsoft Academic Search

    S. S. Mousavi; F. G. Nezami; M. Heydar; M. B. Aryanejad

    2009-01-01

    In this paper a two- phase method is applied for maintenance strategy selection problem. As selecting the most appropriate maintenance strategy requires different alternatives to be assessed for a range of criteria, it could be assumed as a typical multi-criteria decision making problem. There also exist several key factors affecting the selection procedure such as reliability, services quality, risk, etc.,

  9. Maintenance self-assessments - An INPO (Institute of Nuclear Power Operation) perspective

    Microsoft Academic Search

    Subalusky

    1990-01-01

    In March 1987, all nuclear utilities in the US were requested by the Institute of Nuclear Power Operations (INPO) to perform a self-assessment of their maintenance programs. The goal of these self-assessments was to have each station identify any existing problem areas in maintenance in clear and sufficient detail to determine the root causes of the problems and to provide

  10. Optimal maintenance of a multi-unit system under dependencies

    NASA Astrophysics Data System (ADS)

    Sung, Ho-Joon

    The availability, or reliability, of an engineering component greatly influences the operational cost and safety characteristics of a modern system over its life-cycle. Until recently, the reliance on past empirical data has been the industry-standard practice to develop maintenance policies that provide the minimum level of system reliability. Because such empirically-derived policies are vulnerable to unforeseen or fast-changing external factors, recent advancements in the study of topic on maintenance, which is known as optimal maintenance problem, has gained considerable interest as a legitimate area of research. An extensive body of applicable work is available, ranging from those concerned with identifying maintenance policies aimed at providing required system availability at minimum possible cost, to topics on imperfect maintenance of multi-unit system under dependencies. Nonetheless, these existing mathematical approaches to solve for optimal maintenance policies must be treated with caution when considered for broader applications, as they are accompanied by specialized treatments to ease the mathematical derivation of unknown functions in both objective function and constraint for a given optimal maintenance problem. These unknown functions are defined as reliability measures in this thesis, and theses measures (e.g., expected number of failures, system renewal cycle, expected system up time, etc.) do not often lend themselves to possess closed-form formulas. It is thus quite common to impose simplifying assumptions on input probability distributions of components' lifetime or repair policies. Simplifying the complex structure of a multi-unit system to a k-out-of-n system by neglecting any sources of dependencies is another commonly practiced technique intended to increase the mathematical tractability of a particular model. This dissertation presents a proposal for an alternative methodology to solve optimal maintenance problems by aiming to achieve the same end-goals as Reliability Centered Maintenance (RCM). RCM was first introduced to the aircraft industry in an attempt to bridge the gap between the empirically-driven and theory-driven approaches to establishing optimal maintenance policies. Under RCM, qualitative processes that enable the prioritizing of functions based on the criticality and influence would be combined with mathematical modeling to obtain the optimal maintenance policies. Where this thesis work deviates from RCM is its proposal to directly apply quantitative processes to model the reliability measures in optimal maintenance problem. First, Monte Carlo (MC) simulation, in conjunction with a pre-determined Design of Experiments (DOE) table, can be used as a numerical means of obtaining the corresponding discrete simulated outcomes of the reliability measures based on the combination of decision variables (e.g., periodic preventive maintenance interval, trigger age for opportunistic maintenance, etc.). These discrete simulation results can then be regressed as Response Surface Equations (RSEs) with respect to the decision variables. Such an approach to represent the reliability measures with continuous surrogate functions (i.e., the RSEs) not only enables the application of the numerical optimization technique to solve for optimal maintenance policies, but also obviates the need to make mathematical assumptions or impose over-simplifications on the structure of a multi-unit system for the sake of mathematical tractability. The applicability of the proposed methodology to a real-world optimal maintenance problem is showcased through its application to a Time Limited Dispatch (TLD) of Full Authority Digital Engine Control (FADEC) system. In broader terms, this proof-of-concept exercise can be described as a constrained optimization problem, whose objective is to identify the optimal system inspection interval that guarantees a certain level of availability for a multi-unit system. A variety of reputable numerical techniques were used to model the problem as accurately as possible, including a

  11. Maintenance and supply options

    NASA Technical Reports Server (NTRS)

    1988-01-01

    The object of the Maintenance and Supply Option was to develop a high level operational philosophy related to maintenance and supply operations and incorporate these concepts into the Lunar Base Study. Specific products to be generated during this task were three trade studies and a conceptual design of the Logistic Supply Module. The crew size study was performed to evaluate crew sizes from the baseline size of four to a crew size of eight and determine the preferred crew size. The second trade study was to determine the impact of extending surface stay times and recommend a preferred duration of stay time as a function of crew, consumables, and equipment support capabilities. The third trade study was an evaluation of packaging and storage methods to determine the preferred logistics approach to support the lunar base. A modified scenario was developed and served as the basis of the individual trade studies. Assumptions and guidelines were also developed from experience with Apollo programs, Space Shuttle operations, and Space Station studies. With this information, the trade studies were performed and a conceptual design for the Logistic Supply Module was developed.

  12. The NEW Good School Maintenance. A Manual of Programs and Procedures for Buildings, Grounds, and Equipment. Second Edition: Revised and Expanded.

    ERIC Educational Resources Information Center

    Harroun, Jack T., Ed.

    This manual is designed to fill two distinct needs in the school maintenance field: (1) a text or resource in training new maintenance staff members and in staff development, and (2) a reference source for the routine tasks and problems encountered in school sanitation and maintenance. Section 1 covers the basics of good school maintenance,…

  13. Space shuttle maintenance program planning document

    NASA Technical Reports Server (NTRS)

    Brown, D. V.

    1972-01-01

    A means for developing a space shuttle maintenance program which will be acceptable to the development centers, the operators (KSC and AF), and the manufacturer is presented. The general organization and decision processes for determining the essential scheduled maintenance requirements for the space shuttle orbiter are outlined. The development of initial scheduled maintenance programs is discussed. The remaining maintenance, that is non-scheduled or non-routine maintenance, is directed by the findings of the scheduled maintenance program and the normal operation of the shuttle. The remaining maintenance consists of maintenance actions to correct discrepancies noted during scheduled maintenance tasks, nonscheduled maintenance, normal operation, or condition monitoring.

  14. Harnessing the power of maintenance

    SciTech Connect

    Toomey, G. [SKF USA Inc. (United States)

    2006-03-15

    More electric utilities are realizing that structured, comprehensive and proactive maintenance strategies deliver uptime to their bottom line. The article presents four case studies illustrating some of the available solutions to coal and gas-fired plant maintenance. These were: a maintenance strategy review of five coal fired and 22 gas-fired units to identify the importance of equipment along with maintenance tasks; a predictive maintenance program monitoring vibration to detect machine fault conditions including bearing condition; setting up a network to monitor data from several coal- and gas-fired plants at one central location; and creating a maintenance strategy to cushion against the possibility of unscheduled downtime and imposed penalties. 2 photos.

  15. Risk-based maintenance modeling. Prioritization of maintenance importances and quantification of maintenance effectiveness

    SciTech Connect

    Vesely, W.E.; Rezos, J.T. [Science Applications International Corp., Dublin, OH (United States)

    1995-09-01

    This report describes methods for prioritizing the risk importances of maintenances using a Probabilistic Risk Assessment (PRA). Approaches then are described for quantifying their reliability and risk effects. Two different PRA importance measures, minimal cutset importances and risk reduction importances, were used to prioritize maintenances; the findings show that both give similar results if appropriate criteria are used. The justifications for the particular importance measures also are developed. The methods developed to quantify the reliability and risk effects of maintenance actions are extensions of the usual reliability models now used in PRAs. These extended models consider degraded states of the component, and quantify the benefits of maintenance in correcting degradations and preventing failures. The negative effects of maintenance, including downtimes, also are included. These models are specific types of Markov models. The data for these models can be obtained from plant maintenance logs and from the Nuclear Plant Reliability Data System (NPRDS). To explore the potential usefulness of these models, the authors analyzed a range of postulated values of input data. These models were used to examine maintenance effects on a components reliability and performance for various maintenance programs and component data. Maintenance schedules were analyzed to optimize the component`s availability. In specific cases, the effects of maintenance were found to be large.

  16. Resolution of numerical control machine tool modification problems using a symbiosis of machinery diagnostics, modal analysis, structural dynamics modification and acoustic intensity analysis

    SciTech Connect

    Van Hoy, B.W.; Strunk, W.D.; Morton, T.L.; Tuft, R.M.

    1988-01-01

    A multi-million dollar retrofit project was initiated to update a number of older numerical control machine tools. The retrofit replaced the servo control systems, the indexing motors, drive systems and spindle motor. One machine was upgraded as a prototype, but several dynamic problems in both the indexing systems and spindle drive became apparent. These dynamic problems were unacceptable in their effect on machining accuracy. Acoustic intensity measurements were used to pinpoint the source of an irritating 3 KHz tone. This tone indicated a significant amount of energy resulting in a high displacement in the indexing motors. Frequency response measurements of the motor response vs the power supply input quantified the motor problem and the acoustic levels. Modal analysis was applied to the axial resonances of the index motors to determine the response of the mechanical coupling and run up/down tests were used to determine the spindle motor drive problems. 8 figs.

  17. Proactive reliability maintenance: a case study concerning maintenance service costs

    Microsoft Academic Search

    Carlos Manuel Inácio da Silva; Carlos Manuel Pereira Cabrita; João Carlos de Oliveira Matias

    2008-01-01

    Purpose – The purpose of this paper is to emphasize that the choice of the most appropriate maintenance model and policies is the best way to reduce significantly the maintenance costs as well as to optimize the useful Key Performance Indicators – failure rates, reliability, mean time between failures, mean time to repair, and equipment availabilities. Design\\/methodology\\/approach – In order

  18. 2. Space Inventory and Deferred Maintenance ii. Deferred Maintenance

    E-print Network

    Sun, Yu

    is an important element in the university experience for faculty, staff and students. Investments made in both Backlog by Campus, December 2010 The chart below indicates the deferred maintenance backlog by campus Indicators 2011 Figure 2-ii-b Deferred Maintenance Backlog by Campus, 2003 to 2010 The chart below indicates

  19. 2. Space Inventory and Deferred Maintenance ii. Deferred Maintenance

    E-print Network

    Sun, Yu

    Maintenance Performance Relevance: Capital infrastructure is an important element in the university experience $9.7 UTSC $8.1 St. George $259.5 Source: Facility Condition Index Peer Review. The chart above. The chart above indicates the deferred maintenance backlog by campus in the past 4 years compared

  20. 2. Space Inventory and Deferred Maintenance ii. Deferred Maintenance

    E-print Network

    Sun, Yu

    is an important element in the university experience for faculty, staff and students. Investments made in both The chart below indicates the deferred maintenance backlog by campus as of December 2009. Source: Facility The chart below indicates the deferred maintenance backlog which needs to be addressed within the next 5

  1. Insect maintenance and transmission.

    PubMed

    Kingdom, Heather

    2013-01-01

    Phytoplasmas are plant pathogens of huge economic importance due to responsibility for crop yield losses worldwide. Institutions around the world are trying to understand and control this yield loss at a time when food security is high on government agendas. In order to fully understand the mechanisms of phytoplasma infection and spread, more insect vector and phytoplasma colonies will need to be established for research worldwide. Rearing and study of these colonies is essential in the research and development of phytoplasma control measures. This chapter highlights general materials and methods for raising insect vector colonies and maintenance of phytoplasmas. Specific methods of rearing the maize leafhopper and maize bushy stunt phytoplasma and the aster leafhopper and aster yellows phytoplasma strain witches' broom are also included. PMID:22987405

  2. Spares management for improved maintenance

    SciTech Connect

    Moncrief, E.C.; Schroder, R.M.

    1987-01-01

    A recent survey by the US Nuclear Regulatory Commission (NRC) of maintenance practices at US nuclear power plants confirms that spare parts availability is, to some extent, a problem at all but a few plants, and that 57% of the plants sometimes operated in a limiting condition for operation over the last year due to unavailability of spare parts. That's the bad news. The good news is that significant improvement is possible without ballooning inventory. The vast majority of total dollar value of spare parts inventory at power generation stations, whether nuclear or fossil, is rarely used (parts or components that are used 12 or less times per year including many with a history of no use for many years). Inventory Solutions of Akron, Ohio, has developed such a tool, called rarely used inventory stocking logic (RUSL) which is a user-friendly decision support tool for setting spare parts reorder points. Based on statistical computations enhanced to include the most advanced techniques developed for use in aerospace and military combat readiness, RUSL calculates the optimum stocking level to achieve the desired spare part availability at the station. In doing so, it considers the importance of the part in preventing an outage, as well as key economic ordering parameters, such as part cost, carrying cost, number of parts in service, historical observed usage, anticipated future usage, and lead time to replenish.

  3. Maintenance Downtime June 3, 2015

    Atmospheric Science Data Center

    2015-06-02

    ... 07:00 am - 01:00 pm EDT Event Impact:  The Data Pool, MISR order and browse tools, TAD, TES and MOPITT Search and Subset ... be unavailable from 7am - 1 pm for scheduled maintenance. Data processing and distribution may be impacted during maintenance.   ...

  4. Automotive Engine Maintenance and Repair.

    ERIC Educational Resources Information Center

    Marine Corps Inst., Washington, DC.

    This correspondence course, originally developed for the Marine Corps, is designed to provide students with an understanding of automotive engine maintenance and repair. The course contains six study units covering automotive engine maintenance and repair; design classification; engine malfunction, diagnosis, and repair; engine disassembly; engine…

  5. Bipolar disorder therapeutics: maintenance treatment

    Microsoft Academic Search

    Gary S Sachs; Michael E Thase

    2000-01-01

    Although most of the care received by bipolar patients occurs during the maintenance phase, relatively little empirical data is available to guide long-term treatment decisions. We review literature pertaining to key questions related to use of pharmacotherapy in the maintenance phase of bipolar disorder. The few double-blind trials with a reasonable sample size are restricted to bipolar I patients and

  6. Expert judgment in maintenance optimization

    Microsoft Academic Search

    Jan M. van Noortwijk; A. Dekker; Roger M. Cooke; Thomas A. Mazzuchi

    1992-01-01

    A comprehensive method for the use of expert opinion for obtaining lifetime distributions required for maintenance optimization is proposed. The method includes procedures for the elicitation of discretized lifetime distributions from several experts, the combination of the elicited expert opinion into a consensus distribution, and the updating of the consensus distribution with failure and maintenance data. The development of the

  7. Software maintenance in Hong Kong

    Microsoft Academic Search

    Stephen W. L. Yip

    1995-01-01

    In order to find out the state of software maintenance in Hong Kong, we have conducted a questionnaire survey, supplemented by telephone interviews and industrial visits. Our results indicate that, in Hong Kong, about 66% of the total software life cycle cost is spent on software maintenance. The average application system is about 5.1 years old, consisting of 577 programs

  8. Evaluation of Counseling Outcomes at a University Counseling Center: The Impact of Clinically Significant Change on Problem Resolution and Academic Functioning

    ERIC Educational Resources Information Center

    Choi, Keum-Hyeong; Buskey, Wendy; Johnson, Bonita

    2010-01-01

    The main purpose of this study was to investigate how receiving personal counseling at a university counseling center helps students deal with their personal problems and facilitates academic functioning. To that end, this study used both clinical and academic outcome measures that are relevant to the practice of counseling provided at a…

  9. Automated scheduling using Condition Based Maintenance

    Microsoft Academic Search

    Ashis Maity; David Zaremby; David McMullen; Juan Gomez

    2011-01-01

    Maintenance scheduling of machines and their various components can be logistically challenging for a firm or factory. Traditional maintenance schedules are produced using timebased preventive maintenance guidelines. But the preventive maintenance is imprecise as a machine might need a repair before the scheduled timeline due to over-use or premature failure of certain parts. Preventive Maintenance also may cause unneeded repair

  10. A Maintenance Software System for Healthcare Facilities

    Microsoft Academic Search

    INÁCIO FONSECA; TORRES FARINHA; FERNANDO MACIEL BARBOSA

    The maintenance software allows the recording and management of several processes involved in the maintenance operations of any company. It provides detailed information about maintenance of equipments, facilities, resources, spare parts and so on. A useful approach for a modern maintenance is the ability to integrate on condition maintenance modules. In the future, with the rapid development of wireless technology,

  11. Sports Field Maintenance 

    E-print Network

    Duble, Richard L.

    1995-07-31

    Coaches are often more concerned with injuries, personnel problems and opponents than with the condition of the turf on their playing fields. This publication discusses management strategies, including mowing, fertilizing, watering and renovating...

  12. PC proliferation: Minimizing corporate risk through planning for application maintenance

    SciTech Connect

    Shafer, L.I.

    1987-01-01

    The rapid proliferation of personal computers, offering tremendous productivity gains for the knowledge worker, often creates new application maintenance tasks. Specific concerns include security, data integrity, and access authorization. Distributed networks require security and communication systems. Distributed data entry requires file servers, network support personnel, and synchronization methods to preserve the integrity of corporate data. Much PC software which must be maintained will be developed outside of standard-imposing environments and without benefit of formal training. A recommended method for limiting future maintenance problems is the formation of a staff possessing skills specific to problem solving in the areas mentioned and functioning as PC consultants for the area of the knowledge worker.

  13. 14 CFR 91.1433 - CAMP: Maintenance and preventive maintenance training program.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...Maintenance and preventive maintenance training program. 91.1433 Section 91...Maintenance and preventive maintenance training program. Each program manager who...functions for it must have a training program to ensure that each...

  14. Adaptive graphical approach to entity resolution

    Microsoft Academic Search

    Zhaoqi Chen; Dmitri V. Kalashnikov; Sharad Mehrotra

    2007-01-01

    Entity resolution is a very common Information Quality (IQ) problem with many different applications. In digital libraries, it is related to problems of citation matching and author name disambiguation; in Natural Language Processing, it is related to coreference matching and object identity; in Web application, it is related to Web page disambiguation. The problem of Entity Resolution arises because objects\\/entities

  15. Space Station maintenance studies using plaid graphics

    NASA Technical Reports Server (NTRS)

    Helm, Mary E.

    1993-01-01

    The Graphics Analysis Facility (GRAF) has been used frequently to study extravehicular activity (EVA) maintenance scenarios on Space Station Freedom. The ability to use 3-dimensional visualization gives one a more accurate estimate of the Space Station environment. Moreover, human EVA and robotic kinematics can be accurately simulated for columetric reach and collision detection analysis. An animation of this kind was developed for a research group at JSC to study and discover problem areas involved with doing external Space Station maintenance tasks. On the EVA side, it was discovered that items such as handholds and temporary restraint mechanisms should more effectively facilitate EVA movement about the Space Station structure for the suited personnel. Issues concerning CETA cart configuration, PWP storage locations, and locations of EVA storage areas were also identified by use of the animation. In the area of EVA versus robotics, it was found that there is a strong desire to make EVA and robotics interfaces compatible on items such as replacement units and unpressurized logistics carriers. The animation also showed that the use of robotics within an EVA task increases the difficulty and duration of the task setup, leaving less time available for the maintenance task itself. Graphics animation provides a mechanism to simultaneously analyze several mission parameters (i.e., EVA reach, volumetric analysis, and task timelines), and thus, it has proven to be an effective method for mission evaluation.

  16. Robots for Aircraft Maintenance

    NASA Technical Reports Server (NTRS)

    1993-01-01

    Marshall Space Flight Center charged USBI (now Pratt & Whitney) with the task of developing an advanced stripping system based on hydroblasting to strip paint and thermal protection material from Space Shuttle solid rocket boosters. A robot, mounted on a transportable platform, controls the waterjet angle, water pressure and flow rate. This technology, now known as ARMS, has found commercial applications in the removal of coatings from jet engine components. The system is significantly faster than manual procedures and uses only minimal labor. Because the amount of "substrate" lost is minimal, the life of the component is extended. The need for toxic chemicals is reduced, as is waste disposal and human protection equipment. Users of the ARMS work cell include Delta Air Lines and the Air Force, which later contracted with USBI for development of a Large Aircraft Paint Stripping system (LARPS). LARPS' advantages are similar to ARMS, and it has enormous potential in military and civil aircraft maintenance. The technology may also be adapted to aircraft painting, aircraft inspection techniques and paint stripping of large objects like ships and railcars.

  17. Information Technology for Energy and Maintenance Management

    E-print Network

    Villafana, L.; Federspiel, C.

    2003-01-01

    to information from the energy and maintenance systems and by giving them some control over these systems, energy and maintenance performance can be improved. We used interviews with potential users and existing energy and maintenance databases to guide...

  18. Optimal scheduling of fighter aircraft maintenance

    E-print Network

    Cho, Philip Y

    2011-01-01

    The effective scheduling of fighter aircraft maintenance in the Air Force is crucial to overall mission accomplishment. An effective maintenance scheduling policy maximizes the use of maintenance resources and aircraft ...

  19. 49 CFR 195.420 - Valve maintenance.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Valve maintenance. 195.420 Section 195...Operation and Maintenance § 195.420 Valve maintenance. (a) Each operator shall maintain each valve that is necessary for the safe...

  20. 40 CFR 86.094-25 - Maintenance.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...durability determination. New scheduled maintenance...of the implementation of new technology not found in production...maintenance. Requests for new scheduled maintenance must...change, air filter change, cooling system...

  1. 43 CFR 4750.1 - Private maintenance.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2 2011-10-01 2011-10-01 false Private maintenance. 4750.1 Section 4750.1...CONTROL OF WILD FREE-ROAMING HORSES AND BURROS Private Maintenance § 4750.1 Private maintenance. The authorized officer...

  2. 49 CFR 195.420 - Valve maintenance.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Valve maintenance. 195.420 Section... PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...Operation and Maintenance § 195.420 Valve maintenance. (a) Each...

  3. Cost-optimized scheduled maintenance interval for reliability-centered maintenance

    Microsoft Academic Search

    W. R. Wessels

    2003-01-01

    Implementation of a reliability-centered maintenance program is based on performance of proactive maintenance actions that serves to preserve system functionality. Predictive maintenance is a recognized proactive maintenance action that has been underutilized due to quantitative complexity and to the lack of a constraint that defined an optimum scheduled maintenance interval. A cost-optimized scheduled maintenance interval is proposed that uses costs

  4. Psychological health maintenance on Space Station Freedom

    NASA Technical Reports Server (NTRS)

    Santy, Patricia A.

    1990-01-01

    The scheduling of crew rotations at intervals of as much as 180 days on NASA's Space Station Freedom entails that the cumulative effects of psychological, emotional, and social stressors on astronauts be monitored. The Space Station's Health Maintenance Facility (HMF) will furnish preventive, diagnostic, and therapeutic assistance for significant psychiatric and interpersonal problems. Mental health professionals must be part of the team of medical personnel charged with facilitating the physiological and phychological transition from earth to space and back. An account is presently given of the critical factors to be addressed by HMF personnel on extended-duration missions.

  5. Reduced Energy and Maintenance Costs Using Polyurethane as a Replacement Roof System

    E-print Network

    Scott, G. D.

    of the maintenance problems associated with built-up roofs. Standard specifications for this replacement roof were developed, requiring the application of 2 inches of polyurethane foam and 45 mils of a urethane coating. The result being a monolithic weatherproof... Department developed a replacement roof system consisting of foamed polyurethane insulation protected by a tough, waterproof, weather resistant coating. The overall result was a superior roof system, virtually maintenance free, reducing maintenance...

  6. 10. High-Resolution TEM Imaging Spatial resolution is important for any microscopy. This chapter presents

    E-print Network

    10. High-Resolution TEM Imaging Spatial resolution is important for any microscopy. This chapter. Unfortunately, simple and convenient models of #12;524 10. High-Resolution TEM Imaging lenses and especially problems are possible with high-resolution imaging. These were chosen in part to show how much trust can

  7. Maintenance Downtime April 30, 2014

    Atmospheric Science Data Center

    2014-04-28

    Date(s):  Wednesday, April 30, 2014 Time:  7:00 am - 11:00 am EDT Event ... Due to scheduled maintenance Wednesday, April 30, 2014: The Data Pool, MISR order and browse tools, TES and MOPITT Search ...

  8. Management Applications of Maintenance Reports 

    E-print Network

    Gehl, P.

    1993-01-01

    The good computerized maintenance management systems available today provide Plant Engineers with sufficient data to institute policies and procedures to materially affect the company profits. Regrettably, the vast majority of these Engineers...

  9. General Healthcare Maintenance of IBD

    MedlinePLUS

    ... increased risk for abnormal pap smears (precancerous findings). Men and women on immunomodulator therapy are at increased risk of certain skin cancers. Careful monitoring and evaluation are recommended. Please use the health care maintenance ...

  10. Turfgrass: Maintenance Costs in Texas. 

    E-print Network

    Holt, Ethan C.; Allen, W. Wayne; Ferguson, Marvin H.

    1964-01-01

    The Department has numerous turf areas throughout the State other than right-of-way areas. Resident engineer and maintenance facilities in addition to the district head. quarters installatiotls are examples. At these various in stallations, St. Augustinegrass..., since it proc economic yield. Turf represents a Derma vestment in better living, ihe value of' whic be calculated in monetary units. Howe maintenance of turf costs money, and thc may be compared with the economic value agricultural production...

  11. Business Development - Predictive Maintenance Products 

    E-print Network

    Sceiczina, P.

    2005-01-01

    BUSINESS DEVELOPMENT - PREDICTIVE MAINTENANCE PRODUCTS Phillip Sceiczina, ifm efector, inc. In this time of global competitiveness, more companies are focusing on reducing manufacturing costs to increase profits. Energy costs can be a... significant portion of a company?s manufacturing costs. Compressed air leakage is often an overlooked area in predictive maintenance programs, however it greatly impacts the amount of electricity required to run a plant. This paper quantifies the cost...

  12. A study on proactive maintenance scheduling with distributed cooperative approach

    Microsoft Academic Search

    Akihisa Tsujibe; Toshiya Kaihara; Nobutada Fujii; Youichi Nonaka

    2010-01-01

    In our study, we propose a distributed cooperative scheduling method and apply the method to maintenance scheduling problem in re-entrant production systems. Lagrangian decomposition and coordination method is one of the distributed cooperative scheduling methods, which has some individual schedulers and each scheduler needs only local information, then it is relatively easy to expand and modify for large production systems.

  13. Knowledge Management for E-Maintenance of Industrial Automation Systems

    Microsoft Academic Search

    Wei Zhang

    2007-01-01

    Summary. Knowledge management is now considered as a method to improve the global competitive capacity of an enterprise. The evolution of industrial automation systems makes the maintenance tasks more and more important. These tasks imply to deliver the right knowledge\\/information in a right format at the right time to the users. Some problems such as knowledge\\/information exchange and system complexity

  14. Framework of SOA-based equipment maintenance knowledge management system

    Microsoft Academic Search

    Jin Chen

    2010-01-01

    Service-Oriented Architecture (SOA) is a new software architecture. This paper introduces relevant theory of SOA and Web Service as one of the measures to achieve SOA, and presents an integrated framework based on web services. Furthermore, aims at the problems aroused in daily computer facilities maintenance that the University Modern Education Technology Center faces, the paper carries out analysis and

  15. On-aircraft installation and maintenance of fiber optics

    Microsoft Academic Search

    John R. Todd; Norman L. Hug; John C. Pilatos

    1994-01-01

    McDonnell Douglas has developed, installed, and tested a number of fiber optic systems on various commercial and military aircraft. From our experience installing and maintaining many different types of fiber optic flight test systems, it has become evident to us that the problems associated with installation and maintenance of fiber optic systems is perhaps the greatest impediment remaining to their

  16. Extend boiler life through correct boiler tube maintenance

    Microsoft Academic Search

    1989-01-01

    Proper maintenance procedures can provide a dramatic difference in the performance and durability of a waste-to-energy facility boiler. This article explains methods of prolonging boiler life and outlines steps to take when ordering replacement tubing. The paper discusses problems with overheating, sludge, water-side corrosion, corrosion fatigue, standby boilers, fire-side tube failures, superheater tubes, and buying replacement tubes.

  17. Condition Based Maintenance System of Hydroelectric Generating Unit

    Microsoft Academic Search

    Liu Zhong; Zhou Jian-zhong; Zou Min

    2006-01-01

    A three-level system for condition based maintenance (CBM) of hydroelectric generating unit (HGU) is proposed in this paper. The aim is to overcome the projected problems like monitoring items not covering most critical equipments, information inconsistency or redundancy, and insufficient information exchanging and sharing. A systematic audit to HGU is performed, covering from acquired data and parameters to equipment degradation

  18. Geothermal Well Maintenance and Repair in Cerro Prieto

    Microsoft Academic Search

    B. D. Aguirre; F. V. Blanco

    1981-01-01

    When the first well is drilled at a geothermal field, procedures for the cleaning, repair, and control of wells should be established. This aspect will be increasingly important as more wells are drilled. Equipment, tools and techniques need to be improved to achieve economic and safe results. Different systems have been developed and applied in maintenance of wells, in problems

  19. A study of reliability-centred maintenance in maritime operations

    Microsoft Academic Search

    A. J. Mokashi; J. Wang; A. K. Vermar

    2002-01-01

    This paper has identified specific problems likely to be encountered in endeavour of implementing reliability-centred maintenance (RCM) on ships. These stem out of the cultural differences between the aviation and maritime industries. In the maritime industry, RCM is often considered resource demanding. It is however possible to make the project manageable by starting with a critical system. Considerable savings in

  20. A system dynamics modeling approach for a military weapon maintenance supply system

    Microsoft Academic Search

    Chin-Yuan Fan; Pei-Shu Fan; Pei-Chann Chang

    2010-01-01

    This research develops a simulation model using a system dynamics approach to study the bullwhip effect caused in a military weapons maintenance supply system. Previous research shows that military supply chain maintenance problems are mainly caused by aging machines, equipment reliability, weapon life cycle, and inefficient organization, which cause bullwhip effect in the military supply chain. This research uses system

  1. Optimizing Maintenance Therapy for Chronic Obstructive Pulmonary Disease: Strategies for Improving Patient-Centered Outcomes

    Microsoft Academic Search

    Nicola A. Hanania

    2007-01-01

    Background: Chronic obstructive pulmonary disease (COPD) is associated with substantial morbidity and mortality. Published practice guidelines and treatment algorithms for COPD are designed to increase awareness of the problem and improve patient care; however, <40% of subjects diagnosed with COPD are receiving appropriate maintenance therapy.Objective: This paper reviews the use of maintenance therapy in COPD and examines the optimal timing

  2. Leveraging Light-Weight Analyses to Aid Software Maintenance A Dissertation

    E-print Network

    Weimer, Westley

    Leveraging Light-Weight Analyses to Aid Software Maintenance A Dissertation Presented and fixing existing problems, or "bugs," in a system. Software bugs cost the world's economy billions focuses specifically on corrective software maintenance -- that is, the process of finding and fixing bugs

  3. Preventive Maintenance Study: A Key Component in Engineering Education to Enhance Industrial Productivity and Competitiveness.

    ERIC Educational Resources Information Center

    Nachlas, Joel A.; Cassady, C. Richard

    1999-01-01

    Suggests that a chief contributor to the continued economic success of the western economies will be the productivity gains available through efficient preventative maintenance planning and argues for appropriate changes in engineering curricula. Describes the formulation of maintenance planning problems and illustrates with numerical examples the…

  4. Bones and genes: resolution problems in three Vietnamese species of Crocidura (Mammalia, Soricomorpha, Soricidae) and the description of an additional new species

    PubMed Central

    Jenkins, Paulina D.; Abramov, Alexei V.; Bannikova, Anna A.; Rozhnov, Viatcheslav V.

    2013-01-01

    Abstract Recent investigations of Southeast Asian white toothed shrews belonging to the genus Crocidura have revealed discrepancies between the results of morphological and molecular studies. The following study concerns three species of Crocidura occurring in Vietnam, namely Crocidura attenuata, Crocidura tanakae and Crocidura wuchihensis, and an undescribed fourth species revealed by molecular analysis. For many years Crocidura attenuata has been known to occur in Vietnam but, until very recently, the morphologically similar and comparably sized Crocidura tanakae was believed to be restricted to Taiwan. Following several molecular studies over the last few years, this species is now believed to be considerably more widespread and recognised as occuring also in Vietnam. The results of one of these recent molecular studies also revealed the presence of an undescribed species of Crocidura, similar in size and morphology to Crocidura wuchihensis, which is herein described. Data are provided on geographical variation in Vietnam and the problems of defining morphologically similar yet molecularly disparate species are discussed. PMID:23840165

  5. Relational maintenance strategies and equity in marriage

    Microsoft Academic Search

    Daniel J. Canary; Laura Stafford

    1992-01-01

    Utilizing equity theory, this study extends previous research on maintenance strategies. The manner in which relational maintenance strategies are reported and perceived is examined. It was hypothesized that maintenance strategies are used more in equitable relationships than in relationships characterized by underbenefitedness. Further, the use of maintenance efforts by individuals in overbenefited relationships was explored. In addition, this study examined

  6. Wind measurement resolution for a scanning pencil beam scatterometer

    Microsoft Academic Search

    David G. Long

    1994-01-01

    The problem of determining the effective wind measurement resolution of a wind scatterometer is considered. Using simplifying assumptions and approximations, a simple linear model for wind retrieval is derived and related to the effective wind estimate resolution and the backscatter measurement resolution. This enables an analytic evaluation of the scatterometer wind measurement resolution. The effective wind resolution is shown to

  7. High resolution long range terrestrial imaging

    Microsoft Academic Search

    Dan Slater

    2005-01-01

    Achieving high resolution imagery of distant terrestrial objects from ground based sensors presents a unique technical challenge. The entire optical path is fully immersed in a dense and turbulent atmosphere, resulting in a significant loss of scene contrast and resolution. Although there are strong similarities to the problems of high resolution astronomical and space object imaging, there are also some

  8. 21 CFR 1271.160 - Establishment and maintenance of a quality program.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...AND CELLULAR AND TISSUE-BASED PRODUCTS Current Good Tissue Practice § 1271.160 Establishment and maintenance of...long-term action to prevent the problem's recurrence. Documentation of corrective actions must include, where...

  9. 21 CFR 1271.160 - Establishment and maintenance of a quality program.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...AND CELLULAR AND TISSUE-BASED PRODUCTS Current Good Tissue Practice § 1271.160 Establishment and maintenance of...long-term action to prevent the problem's recurrence. Documentation of corrective actions must include, where...

  10. 21 CFR 1271.160 - Establishment and maintenance of a quality program.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...AND CELLULAR AND TISSUE-BASED PRODUCTS Current Good Tissue Practice § 1271.160 Establishment and maintenance of...long-term action to prevent the problem's recurrence. Documentation of corrective actions must include, where...

  11. Autosite.com Repairs - Maintenance

    NSDL National Science Digital Library

    A subsection of Autosite.com, a for-profit (from ads, the content is free) information source for auto buyers, the maintenance and repair area offers free and detailed information on auto care and repair that is accessible but not simplistic. In the maintenance section, users will find a preventative maintenance checklist, illustrated guides to fluids and exterior systems, a discussion on tires, and FAQs. The Repair section features troubleshooting tips, an illustrated repair guide, a fairly deep Auto Repair Encyclopedia, and several related links. Whether you are a die-hard do-it-yourselfer or just prefer to be forearmed before taking your car to the mechanics, this site can help.

  12. Active maintenance of semantic representations.

    PubMed

    Nishiyama, Ryoji

    2014-12-01

    In research on verbal working memory, articulatory rehearsal, a maintenance mechanism for phonological representations, has undergone intensive and excellent study. Possible mechanisms for semantic representation have received less attention. However, several studies have reported a double dissociation in types of memory deficits (semantic memory difficulties vs. phonological memory difficulties). This suggests the separability of two maintenance mechanisms. The present study focused on this separability in individuals with normal memory abilities, using a dual-task interference paradigm. The results indicate a crossover interaction between memory and interference task effects: Preventing articulatory rehearsal more strongly disrupted the phonological memory task, whereas performing a tapping task that interfered with attentional control more strongly disrupted semantic memory. These results suggest that semantic representations are actively maintained by a mechanism other than phonological maintenance. PMID:24687734

  13. NASA Critical Facilities Maintenance Assessment

    NASA Technical Reports Server (NTRS)

    Oberhettinger, David J.

    2006-01-01

    Critical Facilities Maintenance Assessment (CFMA) was first implemented by NASA following the March 2000 overtest of the High Energy Solar Spectroscopic Imager (HESSI) spacecraft. A sine burst dynamic test using a 40 year old shaker failed. Mechanical binding/slippage of the slip table imparted 10 times the planned force to the test article. There was major structural damage to HESSI. The mechanical "health" of the shaker had not been assessed and tracked to assure the test equipment was in good working order. Similar incidents have occurred at NASA facilities due to inadequate maintenance (e.g., rainwater from a leaky roof contaminated an assembly facility that housed a spacecraft). The HESSI incident alerted NASA to the urgent need to identify inadequacies in ground facility readiness and maintenance practices. The consequences of failures of ground facilities that service these NASA systems are severe due to the high unit value of NASA products.

  14. Studying Thermoelectric Oxides using High-Resolution Scanning Transmission Electron Figure 4: a) Atomic resolution Z-

    E-print Network

    Ben-Arie, Jezekiel

    Studying Thermoelectric Oxides using High-Resolution Scanning Transmission Electron Microscopy 0 the environmental impact, and deliver energy continuously, such as thermo-electric power generation, have often been overlooked. Thermo-electric (TE) power applications offer a potentially cheap, pollution- and maintenance

  15. Aerospace Maintenance Technician Course Volume 2: Aerospace Maintenance

    NSDL National Science Digital Library

    Munden, MSgt Scott A.

    This document from SpaceTEC National Aerospace Technical Education Center presents a core readiness course which will serve to prepare individuals entering the aerospace field. The document is 226 pages and includes required proficiencies for aerospace maintenance technicians. Topics include electronic principles, applied mechanics, test and measurements and materials and processes.

  16. Condition-based predictive maintenance of industrial power systems

    NASA Astrophysics Data System (ADS)

    Azam, Mohammad; Tu, Fang; Pattipati, Krishna R.

    2002-07-01

    Traditional static maintenance scheduling based on lifetime data and replacement upon failure is adequate for typical power users. However, in the case of high reliability/availability-oriented industries (e.g., power systems for internet data centers have a desired availability of 0.99999 and, for semiconductor fabrication plants, have availability requirement of 0.9999999), this type of preventive maintenance scheduling is inadequate. A suitable approach in these situations is the adoption of condition-based predictive maintenance. Here the system condition is evaluated by processing the information gathered from the monitors placed at different points in the system, and maintenance is performed only when the failure/malfunction prognosis dictates. In the past, for power systems, voltages, currents, power, temperature and electromagnetic quantities had been monitored along with surface inspection and material quality tests at regular intervals. Diagnostic methods are already in place to indicate problems in industrial power systems by examining these monitored quantities. However, they lack the capability of looking into distant future. With the introduction of modern digital electronics-based smart monitors, the capability of logging power quality data at micro-second intervals, advanced signal processing tools for extracting features from collected data, and data mining techniques, a new horizon in maintenance scheduling has been unveiled. Trending techniques and techniques based on neural networks, when applied to the extracted features, enable us to predict the possible failures of individual equipment and subsystems well before they manifest. This paper considers the problem of evaluating the health indices of components of a power system by making use of the monitored power-quality data and classification techniques. Health index analysis distinguishes the healthy and risky components of the system. Results of these evaluations can be fed as inputs into a system-reliability/availability analysis tool. The reliability analysis enables analysts to decide on prioritization of the maintenance options subject to budget constraints.

  17. On proactivity and maintenance goals

    Microsoft Academic Search

    Simon Duff; James Harland; John Thangarajah

    2006-01-01

    Goals are an important concept in intelligent agent systems, and can take a variety of forms. One such form is mainte- nance goals, which, unlike achievement goals, dene states that must remain true, rather than a state that is to be achieved. Maintenance goals are generally restricted to act- ing as trigger conditions for goals or plans, and often take

  18. Electrical Mechanical Maintenance. Instructor's Guide.

    ERIC Educational Resources Information Center

    Santa Clara County Superintendent of Schools, San Jose, CA.

    This instructor's guide describes the development of a sixteen-week postsecondary course in electrical mechanical maintenance. Following introductory sections that provide background information and a course summary, the third section describes the instructional model used in the course. Section 4 presents an overview of instructional media used…

  19. Maintenance Sourcebook: A Caretaker's Manual.

    ERIC Educational Resources Information Center

    Yeatts, G. Dewey; Stoverink, Al; Conry, Terry; Goulet, Nicole; Wilson, Joe; Ryan, Rob

    2002-01-01

    Discusses five areas of custodial maintenance caretaking in which facility managers need continual education: first aid and safety, hazardous materials, products and supplies, chemicals and their intended use, and cleaning procedures. Includes an annotated list of resources related to these areas. (EV)

  20. New Directions in Maintenance Simulation.

    ERIC Educational Resources Information Center

    Miller, Gary G.

    A two-phase effort was conducted to design and evaluate a maintenance simulator which incorporated state-of-the-art information in simulation and instructional technology. The particular equipment selected to be simulated was the 6883 Convert/Flight Controls Test Station. Phase I included a generalized block diagram of the computer-trainer, the…

  1. Methods to much improve maintenance.

    PubMed

    Lam, K C

    2004-11-01

    The benefits to be gained from the application of both value engineering (VE) and quality systems--e.g. quality assurance (QA), and total quality management (TQM)--to the management of building services maintenance have yet to be realised by the building services industry. These concepts are particularly applicable to complex hospital engineering services. PMID:15575550

  2. Integrated production and maintenance scheduling 

    E-print Network

    Whitaker, Laura Oakes

    1996-01-01

    of maintenance being scheduled in this study. The topic was motivated by the electronic assembly industry. With increased automation of the assembly process, on-line information, such as quality or rate of the assembly process, has become more readily available...

  3. Late referral for maintenance dialysis

    Microsoft Academic Search

    P J Ratcliffe; R E Phillips; D O Oliver

    1984-01-01

    A study of patients accepted for maintenance dialysis at the Oxford renal unit in 1981 showed that 23 out of 55 patients were referred late, very shortly before the need for dialysis. This pattern of referral was associated with a higher morbidity at the start of dialysis which may have been preventable. In the late referral group 16 patients (70%)

  4. Afrikaans Language Maintenance in Australia

    ERIC Educational Resources Information Center

    Hatoss, Aniko; Starks, Donna; van Rensburg, Henriette Janse

    2011-01-01

    Changes in the political climate in the home country have resulted in the emigration of South Africans to English speaking countries such as Britain, Canada, Australia and New Zealand. Despite the scale of movement of the South African population, language maintenance in these diasporic contexts has received little consideration. This paper…

  5. FINAL REPORT ESTABLISHMENT AND MAINTENANCE

    E-print Network

    Rathbun, Julie A.

    with a Central Base and Six Landing Areas ....·......... Distance of Minimum Energy Trajectories on the Moon#12;FINAL REPORT ESTABLISHMENT AND MAINTENANCE OF A MANNED LUNAR BASE IN THE TIME PERIOD 1970, CALIF. WASHINGTON, D. C. #12;#12;TABLE OF CONTENTS APPENDIX A - EARTH-MOON TRANSPORTATION SYSTEMS 1 1

  6. Geophysical methods for road construction and maintenance

    NASA Astrophysics Data System (ADS)

    Rasul, Hedi; Karlson, Caroline; Jamali, Imran; Earon, Robert; Olofsson, Bo

    2015-04-01

    Infrastructure, such as road transportation, is a vital in civilized societies; which need to be constructed and maintained regularly. A large part of the project cost is attributed to subsurface conditions, where unsatisfactory conditions could increase either the geotechnical stabilization measures needed or the design cost itself. A way to collect information of the subsurface and existing installations which can lead to measures reducing the project cost and damage is to use geophysical methods during planning, construction and maintenance phases. The moisture in road layers is an important factor, which will affect the bearing capacity of the construction as well as the maintenances. Moisture in the road is a key factor for a well-functioning road. On the other hand the excessive moisture is the main reason of road failure and problems. From a hydrological point of view geophysical methods could help road planners identify the water table, geological strata, pollution arising from the road and the movement of the pollution before, during and after construction. Geophysical methods also allow road planners to collect valuable data for a large area without intrusive investigations such as with boreholes, i.e. minimizing the environmental stresses and costs. However, it is important to specify the investigation site and to choose the most appropriate geophysical method based on the site chosen and the objective of the investigation. Currently, numerous construction and rehabilitation projects are taking places around the world. Many of these projects are focused on infrastructural development, comprising both new projects and expansion of the existing infrastructural network. Geophysical methods can benefit these projects greatly during all phases. During the construction phase Ground Penetrating radar (GPR) is very useful in combination with Electrical Resistivity (ER) for detecting soil water content and base course compaction. However, ER and Electromagnetic (EM) methods can also be used for monitoring changes in water content and pollutant spreading during the maintenance phase. The objective of this study was to describe various geophysical methods which could benefit the road planning, construction and maintenance phases focusing on hydrological impacts.

  7. Potassium Balances in Maintenance Hemodialysis

    PubMed Central

    Choi, Hoon Young

    2013-01-01

    Potassium is abundant in the ICF compartment in the body and its excretion primarily depends on renal (about 90%), and to a lesser extent (about 10%) on colonic excretion. Total body potassium approximated to 50mmol/kg body weight and 2% of total body potassium is in the ECF compartment and 98% of it in the intracellular compartment.Dyskalemia is a frequent electrolyte imbalance observed among the maintenance hemodialysis patients. In case of hyperkalemia, it is frequently "a silent and a potential life threatening electrolyte imbalance" among patients with ESRD under maintenance hemodialysis. The prevalence of hyperkalemia in maintenance HD patients was reported to be about 8.7-10%. Mortality related to the hyperkalemia has been shown to be about 3.1/1,000 patient-years and about 24% of patients with HD required emergency hemodialysis due to severe hyperkalemia. In contrast to the hyperkalemia, much less attention has been paid to the hypokalemia in hemodialysis patients because of the low prevalence under maintenance hemodialysis patients. Severe hypokalemia in the hemodialysis patients usually was resulted from low potassium intake (malnutrition), chronic diarrhea, mineralocorticoid use, and imprudent use of K-exchange resins. Recently, the numbers of the new patients with advanced chronic kidney disease undergoing maintenance hemodialysis are tremendously increasing worldwide. However, the life expectancy of these patients is still much lower than that of the general population. The causes of excess mortality in these patients seem to various, but dyskalemia is a common cause among the patients with ESRD undergoing hemodialysis. PMID:23946760

  8. Improving maintenance operation through transformational outsourcing

    E-print Network

    Ye, Jacqueline Ming-Shih

    2007-01-01

    Outsourcing maintenance to third-party contractors has become an increasingly popular option for manufacturers to achieve tactical and/or strategic objectives. Though simple in concept, maintenance outsourcing is difficult ...

  9. Effects of dairy intake on weight maintenance

    E-print Network

    Zemel, Michael B.; Donnelly, Joseph E.; Smith, Bryan K.; Sullivan, Debra K.; Richards, Joanna; Morgan-Hanusa, Danielle; Mayo, Matthew S.; Sun, Xiaocun; Cook-Wiens, Galen; Bailey, Bruce W.; Van Walleghen, Emily L.; Washburn, Richard A.

    2008-10-24

    , randomized trial. Weight loss was baseline to 3 months, weight maintenance was 4 to 9 months. Participants were maintained randomly assigned to low dairy ( 3 servings/d) diets for the maintenance phase. Three...

  10. 46 CFR Sec. 9 - Maintenance of documents.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Maintenance of documents. Sec. 9 Section 9 Shipping MARITIME...FINANCIAL TRANSACTIONS UNDER AGENCY AGREEMENTS Documents Sec. 9 Maintenance of documents. The agent shall maintain the...

  11. 46 CFR Sec. 9 - Maintenance of documents.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Maintenance of documents. Sec. 9 Section 9 Shipping MARITIME...FINANCIAL TRANSACTIONS UNDER AGENCY AGREEMENTS Documents Sec. 9 Maintenance of documents. The agent shall maintain the...

  12. Neural network for track initiation and maintenance

    NASA Astrophysics Data System (ADS)

    Winter, Michel; Schmidlin, Valerie; Favier, Gerard

    1997-06-01

    Classical methods for multiple target tracking rely on the suboptimal decomposition of the problem into three steps: track initiation, maintenance and deletion. This paper presents an alternative solution that solves the tracking problem in an integrated way, through a global optimization. This problem is known to be a complex combinatorial one, for which neural models are particularly interesting. Previous works, based on the Hopfield model, proposed neural solutions that are drastically sensitive to the choice of some parameters, specially the size of the network and the weights in the cost function to be minimized. This kind of network often converges towards unacceptable solutions. We propose a new neural solution based on a recursive mode, where the constraints are taken into account in introducing competition between the neurons. The network optimizes an objective function that is a measure of the global quality of the tracking, computed as the sum of the track qualities at a given antenna turn. We finally present some simulation results for multiple target monosensor tracking that enable a comparison with classical techniques.

  13. Super resolution of time-lapse seismic images

    NASA Astrophysics Data System (ADS)

    Zarantonello, Sergio E.; Smithson, Bonnie; Quan, Youli

    2011-06-01

    We present results of an on-going project to assess the applicability in reflection seismology of emerging super resolution techniques pioneered in digital photography. Our approach involves: (1) construction of a forward model connecting low resolution seismic images to high resolution ones, and (2) solution of a Tikhonov-regularized ill conditioned optimization problem to construct a high resolution image from several lower resolution counterparts; the high and low resolution images derived, respectively, from dense and sparse seismic surveys.

  14. Maintenance Management System Based on Bayesian Networks

    Microsoft Academic Search

    Zhiqiang Cai; Shudong Sun; Shubin Si; Bernard Yannou

    2008-01-01

    With the application of maintenance management system, the daily failure data of airplane components has been collected in great number. The challenge faced currently is how to predict the failure probability of certain components and carry out optimal maintenance strategy (when and how) to reduce the lifecycle cost of the airplane. In this paper, we have presented a proactive maintenance

  15. Reliability centered maintenance for transmission systems

    SciTech Connect

    Beehler, M.E. [Burns and McDonnell Engineering Co., Inc., Kansas City, MO (United States)] [Burns and McDonnell Engineering Co., Inc., Kansas City, MO (United States)

    1997-04-01

    The regulatory and market forces that are challenging the electric utility industry require more proactive methods of utility asset management. An important component of asset management for electric utilities is the maintenance of existing transmission lines. Therefore, some utilities are working to implement a condition-based, predictive transmission line maintenance program using the concepts of Reliability Centered Maintenance.

  16. PENTOM 2005 Maintenance prdictive applique aux

    E-print Network

    Boyer, Edmond

    the signature of a health of a board. MOTS CLES : Maintenance proactive, diagnostic, surveillance, avionique KEYWORDS: Proactive maintenance, diagnostic, monitoring, avionics hal-00185497,version1-6Nov2007 ManuscritPENTOM 2005 Maintenance prédictive appliquée aux systèmes électroniques embarqués Samir Ghelam

  17. A Proactive Maintenance Scheme for Wireless Systems

    Microsoft Academic Search

    Barbara Walsh; Ronan Farrell

    2008-01-01

    In the wireless sector maintenance costs form a large part of the total network operating cost. This paper presents a proactive maintenance scheme for wireless systems which is aimed at reducing the high operational costs encountered in the wireless industry by decreasing maintenance costs and system downtime. An on-line monitoring system is used to identify performance degradation, as well as

  18. Some Stability Measures for Software Maintenance

    Microsoft Academic Search

    Stephen S. Yau; James S. Collofello

    1980-01-01

    Software maintenance is the dominant factor contributing to the high cost of software. In this paper, the software maintenance process and the important software quality attributes that affect the maintenance effort are discussed. One of the most important quality attributes of software maintainability is the stability of a program, which indicates the resistance to the potential ripple effect that the

  19. LITTLE LANGUAGES: LITTLE MAINTENANCE? 1 Little Languages

    E-print Network

    Klint, Paul

    LITTLE LANGUAGES: LITTLE MAINTENANCE? 1 Little Languages: Little Maintenance? ARIE VAN DEURSEN CWI Amsterdam, The Netherlands ABSTRACT So-called little, or domain-specific languages (DSLs), have of Software Maintenance, volume 10, 1998. 1 Introduction Little languages, tailored towards the specific needs

  20. Offshore maintenance reduces cost and downtime

    Microsoft Academic Search

    Danahy

    1983-01-01

    Maintenance is the single activity offshore that can have the most impact on productivity, safety, and downtime. Unfortunately, unless it is well organized, maintenance may be carried out according to unchanging and often unnecessary routines. Overly rigid maintenance procedures, that are viewed by crews as ''makework'' assignments, are not conducive to quality or to failure-proof operation of key rig systems.

  1. Institute for Software Technology Software Maintenance

    E-print Network

    1 Institute for Software Technology Software Maintenance VU 3.0 WS 2006 Univ.Prof. Dr. Franz Wotawa Institut für Softwaretechnologie wotawa@ist.tugraz.at VU Software Maintenance 2Institute for Software Technology Wozu Software Maintenance? Meine Software ist immer korrekt! Keine Modifikationen. Nur neue

  2. Maintenance Staffing Levels for Light Rail Transit

    Microsoft Academic Search

    Richard Stanger

    2005-01-01

    This synthesis documents light rail maintenance staffing practices and factors important in their development at U.S. transit agencies. It covers the areas of maintenance functions, new light rail start-up, and management in attempting to give better insight into the variables affecting maintenance staffing. This topic is of interest to transit managers of existing light rail transit (LRT) operations and those

  3. Automatic elevator system for maintenance services

    Microsoft Academic Search

    R. A. Roncolatto; N. W. Romanelli; O. Horikawa; A. Hirakawa; S. M. Amancio; M. Silverio

    2006-01-01

    This work presents an electrically assisted automatic elevator system for maintenance of street lights. The system was installed in a public illumination maintenance truck. It consists of a telescopic column, a base structure, and a platform. The whole operation is monitored and controlled by a PLC. The system aims at reducing efforts in maintenance tasks as well as improving the

  4. Laboratory services series: a programmed maintenance system

    SciTech Connect

    Tuxbury, D.C.; Srite, B.E.

    1980-01-01

    The diverse facilities, operations and equipment at a major national research and development laboratory require a systematic, analytical approach to operating equipment maintenance. A computer-scheduled preventive maintenance program is described including program development, equipment identification, maintenance and inspection instructions, scheduling, personnel, and equipment history.

  5. Opportune maintenance and predictive maintenance decision support douard Thomas, ric Levrat, Benoit Iung, Pierre Cocheteux

    E-print Network

    Paris-Sud XI, Université de

    . Moreover predictive vs. proactive maintenance strategies may generate numerous opportunities to perform nonOpportune maintenance and predictive maintenance decision support Édouard Thomas, Éric Levrat.levrat, benoit.iung, pierre.cocheteux}@cran.uhp-nancy.fr) Abstract: Conventional maintenance strategies

  6. Themes from a Camp Maintenance Network: Camp Maintenance and Property Personnel Share Their Insights and Challenges.

    ERIC Educational Resources Information Center

    Whyman, Wynne

    2003-01-01

    A camp maintenance survey was completed by maintenance personnel from 99 camps. Results highlighted several important considerations: ensuring sufficient maintenance funds for aging infrastructure, including camp/property personnel in decision making, publicizing completed maintenance projects, examining long-term needs of the land, and adopting…

  7. AviAtion MAintenAnce College of Rural and Community Development

    E-print Network

    Hartman, Chris

    AviAtion MAintenAnce College of Rural and Community Development Community and Technical College 907 credits; for Degree: 64 credits Aviation maintenance offers an AAS degree and certificates in three ar and powerplant may elect to complete the AAS degree in aviation maintenance to enhance their employability

  8. Programmable Maintenance Processor For XAIDS

    NASA Technical Reports Server (NTRS)

    Glover, Richard

    1991-01-01

    Programmable maintenance processor (MAINT) made of commercially available integrated circuits. Autonomous one of four digital electronic processors in extended aircraft interrogation and display system (XAIDS). Developed for testing of system and application computer programs as well as for testing equipment. MAINT has independent terminal and printer interfaces and dedicated magnetic bubble memory storing system-testing sequences entered from terminal. Software for MAINT written in PLM86 programming language and broken into four separate modules.

  9. Designing a scrubber for maintenance

    SciTech Connect

    Mahlmeister, M.E.; Baron, E.S. [New York State Electric and Gas Corp., Binghamton, NY (United States); Watts, J. [USDOE Pittsburgh Energy Technology Center, PA (United States)

    1996-12-01

    Under Round 4 of the U.S. Department of Energy`s (DOE) Clean Coal Technology program, New York State Electric & Gas Corporation (NYSEG), in partnership with Saarberg-Holter-Umwelttechnik (SHU), Consolidation Coal Company and Stebbins Engineering and Manufacturing Company, has retrofitted a formic acid enhanced forced oxidation wet limestone scrubber on Units I and 2 at the Milliken Steam Electric Station. Units I and 2 are 1950s vintage Combustion Engineering tangentially fired pulverized coal units, which are rated at nominal 150 MW each and operate in balanced draft mode. The Flue Gas Desulfurization (FGD) system for Unit 2 was placed into operation in January 1995 and the Unit I system in June 1995. The project incorporates several unique aspects: low pH operation; a ceramic tile-lined cocurrent/countercurrent, split module absorber; a wet stack supported on the roof of the FGD building; and closed loop, zero liquid discharge operation that produces commercial grade gypsum and calcium chloride brine. The project objectives include 98% SO{sub 2} removal efficiency while burning high sulfur coal, the production of marketable byproducts to minimize solid waste disposal, zero wastewater discharge, space-saving design, and minimization of maintenance requirements of a wet scrubber. The paper provides a brief overview of the project scrubber design relating to maintenance considerations. A discussion of the early results of the maintenance history is also provided. Repair techniques that have been developed and tested for ceramic tile lined modules are included. 1 fig.

  10. Maintenance testing of Navy underground high voltage cables

    Microsoft Academic Search

    J. L. Brooks; C. B. Beck

    1977-01-01

    Methods of testing high voltage underground cable were investigated in order to find an alternative to the dc high-potential (hi-pot) test for cable maintenance testing. The search for such a method proved fruitless, however. The problems of using the dc hi-pot test are discussed, and a recommended procedure of testing is presented. In addition, a new method of locating cable

  11. MEDWRAP: Consistent View Maintenance over Distributed Multi-relation Sources

    Microsoft Academic Search

    Aparna S. Varde; Elke A. Rundensteiner

    2002-01-01

    Warehouses today extract information from several sources, each with multiple relations. Incremental View Maintenance (VM)\\u000a of warehouses in such environments faces the problem of concurrency conflicts due to simultaneous relational updates occurring\\u000a within and across these (semi-autonomous) sources. Existing VM algorithms only partially solve this issue. Some like ECA and\\u000a CCA assume a single-source warehouse, while others like Strobe and

  12. Mobile robot navigation using multi-resolution electrostatic potential field

    Microsoft Academic Search

    Cheol-Taek Kim; Ju-Jang Lee

    2005-01-01

    This paper proposes a multi-resolution electrostatic potential field (MREPF) based solution to the mobile robot path planning and collision avoidance problem in 2D dynamic environment. The MREPF is an efficient method in calculation time and updating field map. The large scale resolution map is added to EPF and this resolution map interacts with the small scale resolution map to find

  13. Estimation of High Resolution Images and Registration Parameters

    E-print Network

    Granada, Universidad de

    Estimation of High Resolution Images and Registration Parameters from Low Resolution Observations@ece.nwu.edu Abstract. In this paper we consider the problem of reconstructing a high resolution image from a set of undersampled and degraded frames, all of them obtained from high resolution images with unknown shifting

  14. High-resolution images from low-resolution compressed video

    Microsoft Academic Search

    C. Andrew Segall; Rafael Molina; Aggelos K. Katsaggelos

    2003-01-01

    Surveys the field of super resolution (SR) processing for compressed video. The introduction of motion vectors, compression noise, and additional redundancies within the image sequence makes this problem fertile ground for novel processing methods. In conducting this survey, though, we develop and present all techniques within the Bayesian framework. This adds consistency to the presentation and facilitates comparison between the

  15. An application of Laplace transforms to a machine maintenance problem

    E-print Network

    Boone, James Robert

    1962-01-01

    during the down period. If a system of machines is characterized by the Poisson arrival times and exponential holding time, then, the system satisfies the following conditions: (1) If a machine is operative at time t, then the probability of its... failure before time i+h is kh. (2) If a machine is not operative at time t, then the probability of it being operative before time t + h is ph. (3) If y(h) is the probability of more than one failure or repair between t and t + h then 1im 1 hmo h ? y...

  16. An application of Laplace transforms to a machine maintenance problem 

    E-print Network

    Boone, James Robert

    1962-01-01

    during the down period. If a system of machines is characterized by the Poisson arrival times and exponential holding time, then, the system satisfies the following conditions: (1) If a machine is operative at time t, then the probability of its... failure before time i+h is kh. (2) If a machine is not operative at time t, then the probability of it being operative before time t + h is ph. (3) If y(h) is the probability of more than one failure or repair between t and t + h then 1im 1 hmo h ? y...

  17. Research on the Maintenance Decision-Making of Cement Concrete Pavement Based on Preventive Maintenance

    Microsoft Academic Search

    Jian Zhao; Jia Xu

    2009-01-01

    The cement concrete pavement maintenance decision-making model has been proposed, by analyzing the formation and development characteristics of pavement diseases and considering the actual maintenance in Hunan Expressway. The maintenance decision-making tree and the decision-making progress have been established in order to realize the purpose of rational distribution of maintenance funds and improve maintenance quality, under the thought of preventive

  18. Pacific Northwest Laboratory Maintenance Implementation plan

    SciTech Connect

    Bright, J.D.

    1992-06-01

    This Maintenance Implementation plan has been developed for Pacific Northwest Laboratory's (PNL) Nuclear Facilities: 306W, 324, 325, 327 and 329NMF. It is based on a graded approach, self-assessment of the existing maintenance program(s) per the requirements specified by US Department of Energy (DOE) Order 4330.4A, Chapter II, Change {number sign}3. The results of this assessment were evaluated to determine needed improvements in PNL Craft Services' current maintenance program. The objective of this implementation plan is to provide baseline information for compliance to the DOE 4330.4A, and for needed improvements. The prime consideration in applying a graded approach to the Order has been to maintain safe and reliable operations, environmental compliance, safeguards and security, programmatic mission, facility preservation, and/or other facility-specific requirements. Using the results of the self-assessment, PNL has selected nine of the 18 elements of the Maintenance Program defined by DOE Order 4330.4A for improvement. The elements selected for improvement are Training and Qualification of Maintenance Personnel; Maintenance Procedures; Planning, Scheduling, and Coordination of Maintenance; Control of Maintenance Activities; Post-Maintenance Testing; Facility Condition Inspection; Management Involvement; Maintenance History; and Additional Maintenance Requirements. Based upon graded approach and current funding, those elements considered most important have been selected as goals for earliest compliance. Commitment dates for these elements have been established for compliance. The remaining elements of noncompliance will be targeted for implementation during later budget periods.

  19. Pacific Northwest Laboratory Maintenance Implementation plan

    SciTech Connect

    Bright, J.D.

    1992-06-01

    This Maintenance Implementation plan has been developed for Pacific Northwest Laboratory`s (PNL) Nuclear Facilities: 306W, 324, 325, 327 and 329NMF. It is based on a graded approach, self-assessment of the existing maintenance program(s) per the requirements specified by US Department of Energy (DOE) Order 4330.4A, Chapter II, Change {number_sign}3. The results of this assessment were evaluated to determine needed improvements in PNL Craft Services` current maintenance program. The objective of this implementation plan is to provide baseline information for compliance to the DOE 4330.4A, and for needed improvements. The prime consideration in applying a graded approach to the Order has been to maintain safe and reliable operations, environmental compliance, safeguards and security, programmatic mission, facility preservation, and/or other facility-specific requirements. Using the results of the self-assessment, PNL has selected nine of the 18 elements of the Maintenance Program defined by DOE Order 4330.4A for improvement. The elements selected for improvement are Training and Qualification of Maintenance Personnel; Maintenance Procedures; Planning, Scheduling, and Coordination of Maintenance; Control of Maintenance Activities; Post-Maintenance Testing; Facility Condition Inspection; Management Involvement; Maintenance History; and Additional Maintenance Requirements. Based upon graded approach and current funding, those elements considered most important have been selected as goals for earliest compliance. Commitment dates for these elements have been established for compliance. The remaining elements of noncompliance will be targeted for implementation during later budget periods.

  20. High resolution telescope

    DOEpatents

    Massie, Norbert A. (San Ramon, CA); Oster, Yale (Danville, CA)

    1992-01-01

    A large effective-aperture, low-cost optical telescope with diffraction-limited resolution enables ground-based observation of near-earth space objects. The telescope has a non-redundant, thinned-aperture array in a center-mount, single-structure space frame. It employs speckle interferometric imaging to achieve diffraction-limited resolution. The signal-to-noise ratio problem is mitigated by moving the wavelength of operation to the near-IR, and the image is sensed by a Silicon CCD. The steerable, single-structure array presents a constant pupil. The center-mount, radar-like mount enables low-earth orbit space objects to be tracked as well as increases stiffness of the space frame. In the preferred embodiment, the array has elemental telescopes with subaperture of 2.1 m in a circle-of-nine configuration. The telescope array has an effective aperture of 12 m which provides a diffraction-limited resolution of 0.02 arc seconds. Pathlength matching of the telescope array is maintained by an electro-optical system employing laser metrology. Speckle imaging relaxes pathlength matching tolerance by one order of magnitude as compared to phased arrays. Many features of the telescope contribute to substantial reduction in costs. These include eliminating the conventional protective dome and reducing on-site construction activites. The cost of the telescope scales with the first power of the aperture rather than its third power as in conventional telescopes.

  1. Hayden Station: power plant maintenance system preventive maintenance program

    SciTech Connect

    Not Available

    1984-06-15

    The Initial Report and the First Interim Progress Report included a copy of the Preventive Maintenance Questionnaire. In the past two years, the rating went from 80 (excellent) to 82 (excellent). Progress is still being made in most areas but it consists of fine tuning the existing programs. The Generation Statistics are included. The availability factor for the past 12 months was 79.3% for Unit No. 1 and 93.9% for Unit No. 2, an improvement of 5.3% and 5.9%, respectively, over 1980.

  2. Contact | High Resolution Electron Microscopy

    Cancer.gov

    The long-term mission of our research program is to obtain an integrated, quantitative understanding of cells and viruses at molecular resolution. We take an interdisciplinary approach to this problem by combining novel technologies for 3D imaging with computational and cell biological tools.

  3. Optimizing expressway maintenance planning by coupling ant algorithm and geography information system transportation in Hubei province, China

    Microsoft Academic Search

    Hongga Li; Xiaoxia Huang; Quan Feng

    2011-01-01

    Highway maintenance scheduling is a complex optimization problem and imposes a challenge for GIS-T research. In this paper, a new approach was put forward to determining the optimal set of alternatives for highway infrastructure facilities by using ant colony algorithm and GIS. In the proposed approach, GIS was used to analyze traffic flux, toll and maintenance time of each highway

  4. A Minimum Delta V Orbit Maintenance Strategy for Low-Altitude Missions Using Burn Parameter Optimization

    NASA Technical Reports Server (NTRS)

    Brown, Aaron J.

    2011-01-01

    Orbit maintenance is the series of burns performed during a mission to ensure the orbit satisfies mission constraints. Low-altitude missions often require non-trivial orbit maintenance Delta V due to sizable orbital perturbations and minimum altitude thresholds. A strategy is presented for minimizing this Delta V using impulsive burn parameter optimization. An initial estimate for the burn parameters is generated by considering a feasible solution to the orbit maintenance problem. An low-lunar orbit example demonstrates the Delta V savings from the feasible solution to the optimal solution. The strategy s extensibility to more complex missions is discussed, as well as the limitations of its use.

  5. Reduce costs with knowledge-based maintenance

    SciTech Connect

    Finley, H.F.

    1987-01-01

    Human psychology plays a major role in this situation. A repairman is employed to ''do maintenance.'' That's his job. Management evaluates his performance on how actively he goes about his work. In experience-based maintenance programs, repairmen are not employed to ''not do maintenance.'' It would be unthinkable to have idle repairmen even though the plant is operating perfectly well and needs no attention. People must work to earn their pay. Knowledge-based maintenance programs start with the management philosophy that doing maintenance is an unproductive and uneconomic activity. The goal is to have a 100 percent reliable plant that never needs any maintenance of any kind; not a single manhour during the life of the plant. Unfortunately, that is an unattainable goal. Plants can't operate without maintenance. Consequently, management's policy becomes one of identifying essential maintenance, doing that work, doing it well and eliminating or at least minimizing all other work. In an earlier paper, the author defined three kinds of maintenance work: essential, optional and luxury. The usual objective is to do the essential work and that part of the optional work that is economically beneficial. The uneconomical optional and luxury work are avoided. Knowledge-based maintenance programs are structured to achieve these objectives.

  6. Initial flight qualification and operational maintenance of X-29A flight software

    NASA Technical Reports Server (NTRS)

    Earls, Michael R.; Sitz, Joel R.

    1989-01-01

    A discussion is presented of some significant aspects of the initial flight qualification and operational maintenance of the flight control system softward for the X-29A technology demonstrator. Flight qualification and maintenance of complex, embedded flight control system software poses unique problems. The X-29A technology demonstrator aircraft has a digital flight control system which incorporates functions generally considered too complex for analog systems. Organizational responsibilities, software assurance issues, tools, and facilities are discussed.

  7. Scheduling jobs and a variable maintenance on a single machine with common due-date assignment.

    PubMed

    Wan, Long

    2014-01-01

    We investigate a common due-date assignment scheduling problem with a variable maintenance on a single machine. The goal is to minimize the total earliness, tardiness, and due-date cost. We derive some properties on an optimal solution for our problem. For a special case with identical jobs we propose an optimal polynomial time algorithm followed by a numerical example. PMID:25147861

  8. Scheduling Jobs and a Variable Maintenance on a Single Machine with Common Due-Date Assignment

    PubMed Central

    Wan, Long

    2014-01-01

    We investigate a common due-date assignment scheduling problem with a variable maintenance on a single machine. The goal is to minimize the total earliness, tardiness, and due-date cost. We derive some properties on an optimal solution for our problem. For a special case with identical jobs we propose an optimal polynomial time algorithm followed by a numerical example. PMID:25147861

  9. Second Line of Defense: Electronic Maintenance Reports, Local Maintenance Provider User Guide, Rev. 3

    SciTech Connect

    Leigh, Richard J.

    2012-09-01

    The Electronic Maintenance Report forms allow Local Maintenance Providers (LMP) and other program staff to enter maintenance information into a simple and secure system. This document describes the features and information required to complete the Maintenance Report forms. It is expected that all Corrective Maintenance Reports from LMPs will be submitted electronically into the SLD Portal. As an exception (e.g., when access to the SLD Portal is unavailable), Maintenance Reports can be submitted via a secure Adobe PDF form available through the Sustainability Manager assigned to each country.

  10. Maintenance dialysis in developing countries.

    PubMed

    Sinha, Aditi; Bagga, Arvind

    2015-02-01

    Patients with end-stage renal disease require renal replacement therapy with maintenance hemodialysis or chronic peritoneal dialysis while awaiting transplantation. In addition to economic issues and limited state funding for advanced health care, the lack of trained medical personnel contributes to scarce dialysis facilities for children in developing countries. The establishment and operation of a hemodialysis unit with multidisciplinary facilities is both cost- and labor-intensive. Hemodialysis is usually carried out three times a week in a hospital setting and affects the curricular and extracurricular activities of the patient. Chronic ambulatory or cyclic peritoneal dialysis is technically simpler and allows better nutrition and growth, but is expensive for the majority of patients who must pay out of their own pocket. Multiple initiatives to enhance the training of pediatricians and nurses in skills related to initiating and managing patients on maintenance dialysis have resulted in the improved survival of children with end-stage renal disease. Support from state governments and philanthropic institutions have helped in establishing pediatric nephrology units that are equipped to provide renal replacement therapy for children. PMID:24469439

  11. No maintenance -- no energy efficiency

    SciTech Connect

    Szydlowski, R.F.; Schliesing, J.S.; Winiarski, D.W.

    1994-12-01

    Field investigations illustrate that it is not realistic to expect new high-tech equipment to function for a full life expectancy at high efficiency without significant operations and maintenance (O&M). A simple walk through inspection of most buildings reveals extensive equipment that is being operated on manual override, is incorrectly adjusted and operating inefficiently, or is simply inoperative. This point is illustrated with two examples at Robins Air Force Base, Georgia. The first describes development of a comprehensive, base-wide, steam trap maintenance program. The second describes a measured evaluation from a typical office building. The objective of both examples was to assess the importance of proper O&M. The proposed ``O&M First`` philosophy will result in more efficient building HVAC operation, provide improved services to the building occupants, and reduce energy consumption and unscheduled equipment repair/replacement. Implementation of a comprehensive O&M program will result in a 15--25% energy savings. The O&M foundation that is established will allow other energy conservation activities such is demand side management or energy management and control systems, to achieve and maintain their expected energy savings.

  12. Range resolution of unequal strength targets

    E-print Network

    Carlson, Blair D.

    This paper examines the problem of resolving targets whose amplitudes may differ. A common metric used for resolution that assumes targets of equal strength is modified for the subject scenario. An expression for range ...

  13. Crafting Elegant Solutions: Strategies for Conflict Resolution.

    ERIC Educational Resources Information Center

    Koch, Susan J.; Decker, Robert H.

    1993-01-01

    The conflict-resolution technique of interpersonal negotiation involves five steps: (1) state your positive intentions; (2) define, analyze, and discuss the problem; (3) summarize progress; (4) explore alternative solutions; and (5) set a time for follow-up. (MLF)

  14. Anaphora Resolution: A Multi.Strategy Approach

    E-print Network

    Carbonell, Jaime

    Anaphora Resolution: A Multi.Strategy Approach Jaime G. Carbonell Ralf D. Brown Computer Science, pragmatics Abstract Anaphora resolution has proven to be a very difficult problem; it requires the integrated application of syntactic, semantic, and pragmatic knowledge. This paper examines the hypothesis that instead

  15. Reciprocal anaphora resolution in Pashto discourse

    Microsoft Academic Search

    Rahman Ali; M. A. Khan; M. Bilal; Ihsan Rabbi

    2008-01-01

    It is very important for an effective machine translation system to transform the multi-sentential discourses, of a source language, into simple and cohesion free discourses. Anaphora resolution is the predicament in computational linguistics that is responsible for the alleged problem. This paper is about the lexical (reciprocal) anaphora resolution in Pashto language and presents an algorithm that is based on

  16. Reliability Centered Maintenance: the EDF's Experience

    SciTech Connect

    Huyart, Thierry [Electricite de France, EDF-DPN-FTC, 1 place Pleyel 93282 Saint-Denis Cedex (France); Degrave, Claude; Dubreuil-Chambardel, Alain [Electricite de France, EDF-SEPTEN, 12-14 avenue Dutrievoz 69628 Villeurbanne Cedex (France)

    2002-07-01

    In order to ensure safest possible operation and to get best overall economic performance of its Nuclear Power Plants, 10 years ago Electricite de France launched a Reliability Centered Maintenance (RCM) project (the so-called OMF Methodology in French) to optimize the preventive maintenance programs, while keeping safety at the right level required. The principles underlying the RCM approach are based on common sense: failures must be prevented by preventive maintenance operations in all cases when the repercussions for the installation could be serious or critical in term of safety, availability or maintenance costs. The new preventive maintenance programs are presently almost completed and progressively implemented. Here and now, the implementation of the RCM approach allows to emphasize some benefits in the fields of costs, safety availability and maintenance culture. (authors)

  17. Ordinances and Resolutions ORDINANCES, RESOLUTIONS AND REGULATIONS

    E-print Network

    Brierley, Andrew

    Page 2.1 Ordinances and Resolutions ORDINANCES, RESOLUTIONS AND REGULATIONS 1. ORDINANCES AND RESOLUTIONS I. REGULATIONS FOR RESEARCH STUDENTS AND APPOINTMENT OF RESEARCH FELLOWS Ordinance 350, and Supplementary Regulations by the Senatus Academicus 1. Ordinance No. 61 (General No. 23) of the Commissioners

  18. Intelligent prognostics tools and e-maintenance

    Microsoft Academic Search

    Jay Lee; Jun Ni; Dragan Djurdjanovic; Hai Qiu; Haitao Liao

    2006-01-01

    In today's global competitive marketplace, there is intense pressure for manufacturing industries to continuously reduce and eliminate costly, unscheduled downtime and unexpected breakdowns. With the advent of Internet and tether-free technologies, companies necessitate dramatic changes in transforming traditional “fail and fix (FAF)” maintenance practices to a “predict and prevent (PAP)” e-maintenance methodology. E-maintenance addresses the fundamental needs of predictive intelligence

  19. Tandem mirror next step: remote maintenance

    SciTech Connect

    Doggett, J.N.; Damm, C.C.; Hanson, C.L.

    1980-10-27

    This study of the next proposed experiment in the Mirror Fusion Program, the Tandem Mirror Next Step (TMNS), has included serious consideration of the maintenance requirements of such a large source of high energy neutrons with its attendant throughput of tritium. Although maintenance will be costly in time and money, our conclusion is that with careful attention to a design for maintenance plan such a device can be reliably operated.

  20. Sensing Technologies for Railway Track Maintenance

    NASA Astrophysics Data System (ADS)

    Takai, Hideyuki

    Railway track is has unique character that it deforms gradually under repetitive train passage. It is no exaggeration to say that track technology is essentially maintenance technology. To maintain sufficient track condition for train running safety and passenger riding comfort, various kinds of inspection are carried with various methods. This paper introduces the state-of-the-art sensing technologies applied for track maintenance. We hope this information will inspire engineers in sensing technology field to develop new application for future track maintenance.

  1. PFP MICON maintenance manual. Revision 1

    SciTech Connect

    Silvan, G.R.

    1995-01-25

    This manual covers the use of maintenance displays, maintenance procedures, system alarms and common system failures. This manual is intended to supplement the MICON maintenance training not replace it. It also assumes that the user is familiar with the normal operation of the MICON A/S system. The MICON system is a distributed control computer and, among other things, controls the HVAC system for the Plutonium Finishing Plant.

  2. Risk Based Maintenance Optimization using Probabilistic Maintenance Quantification Models of Circuit Breaker 

    E-print Network

    Natti, Satish

    2010-01-14

    New maintenance techniques for circuit breakers are studied in this dissertation by proposing a probabilistic maintenance model and a new methodology to assess circuit breaker condition utilizing its control circuit data. A risk-based decision...

  3. 14 CFR 91.1425 - CAMP: Maintenance, preventive maintenance, and alteration programs.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...DEPARTMENT OF TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES GENERAL OPERATING AND FLIGHT RULES Fractional Ownership Operations Program Management § 91.1425 CAMP: Maintenance, preventive maintenance, and alteration...

  4. 47 CFR 80.1074 - Radio maintenance personnel for at-sea maintenance.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Radio maintenance personnel for...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES STATIONS IN THE...Provisions § 80.1074 Radio maintenance personnel...

  5. 47 CFR 80.1074 - Radio maintenance personnel for at-sea maintenance.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Radio maintenance personnel for...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES STATIONS IN THE...Provisions § 80.1074 Radio maintenance personnel...

  6. 47 CFR 80.1074 - Radio maintenance personnel for at-sea maintenance.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Radio maintenance personnel for...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES STATIONS IN THE...Provisions § 80.1074 Radio maintenance personnel...

  7. Longview District Operations and Maintenance Headquarters: Environmental assessment

    SciTech Connect

    Not Available

    1992-03-01

    Bonneville Power Administration (BPA) operations and maintenance staff are presently based at a headquarters next to the Longview Substation. These headquarters buildings, however, were built in 1941 and have deteriorated to the point of needing extensive repair. They also lack sufficient inside storage space. New buildings cannot be constructed on the site because of surrounding development. In addition, the site is within an area exposed to industrial fallout (coal tar pitch and metallic particles) that may be damaging buildings, equipment, and vehicles. BPA is concerned about the potential health risk to headquarters staff from the fallout. In light of these problems, BPA proposes to construct a new operations and maintenance headquarters at a different location, and to demolish the existing headquarters. This paper discusses the environmental impacts of the proposed action and alternatives.

  8. Longview District Operations and Maintenance Headquarters : Environmental Assessment.

    SciTech Connect

    United States. Bonneville Power Administration.

    1992-03-01

    Bonneville Power Administration (BPA) operations and maintenance staff are presently based at a headquarters next to the Longview Substation. These headquarters buildings, however, were built in 1941 and have deteriorated to the point of needing extensive repair. They also lack sufficient inside storage space. New buildings cannot be constructed on the site because of surrounding development. In addition, the site is within an area exposed to industrial fallout (coal tar pitch and metallic particles) that may be damaging buildings, equipment, and vehicles. BPA is concerned about the potential health risk to headquarters staff from the fallout. In light of these problems, BPA proposes to construct a new operations and maintenance headquarters at a different location, and to demolish the existing headquarters. This paper discusses the environmental impacts of the proposed action and alternatives.

  9. Laboratory maintenance of Neisseria gonorrhoeae.

    PubMed

    Spence, Janice M; Wright, Lori; Clark, Virginia L

    2008-02-01

    Neisseria gonorrhoeae is a human pathogen of mucosal surfaces, thus laboratory manipulations must include appropriate safety measures. The growth requirements and behavior of the gonococcus are significantly different from many bacteria, necessitating modifications of common laboratory techniques. A fastidious organism, N. gonorrhoeae requires enriched media in a CO2 atmosphere at 35 degrees to 37 degrees C for growth. In addition, N. gonorrhoeae expresses potent autolysins whose activity increases following glucose depletion during stationary phase, leading to cell death. Long believed to be an obligate aerobe, the gonococcus is capable of anaerobic growth when provided with a suitable electron acceptor. This unit provides information for both aerobic and anaerobic growth, basic long-term and daily maintenance of gonococcal cultures, as well as safety considerations for laboratory studies. PMID:18770539

  10. Simulated maintenance a virtual reality

    SciTech Connect

    Lirvall, P. [Atomic Energy of Canada Limited`s Chalk River Lab., Ontario (Canada)

    1995-10-01

    The article describes potential applications of personal computer-based virtual reality software. The applications are being investigated by Atomic Energy of Canada Limited`s (AECL) Chalk River Laboratories for the Canadian deuterium-uranium (Candu) reactor. Objectives include: (1) reduction of outage duration and improved safety, (2) cost-effective and safe maintenance of equipment, (3) reduction of exposure times and identification of overexposure situations, (4) cost-effective training in a virtual control room simulator, (5) human factors evaluation of design interface, and (6) visualization of conceptual and detailed designs of critical nuclear field environments. A demonstration model of a typical reactor control room, the use of virtual reality in outage planning, and safety issues are outlined.

  11. Resolution in Electromagnetic Prospecting

    NASA Astrophysics Data System (ADS)

    Aldridge, D. F.; Bartel, L. C.; Knox, H. A.; Schramm, K. A.

    2014-12-01

    Low-frequency electromagnetic (EM) signals are commonly used in geophysical exploration of the shallow subsurface. Sensitivity to conductivity implies they are particularly useful for inferring fluid content of porous media. However, low-frequency EM wavefields are diffusive, and have significantly larger wavelengths compared to seismic signals of equal frequency. The wavelength of a 30 Hz sinusoid propagating with seismic velocity 3000 m/s is 100 m, whereas an analogous EM signal diffusing through a conductive body of 0.1 S/m (clayey shale) has wavelength 1825 m. The larger wavelength has implications for resolution of the EM prospecting method. We are investigating resolving power of the EM method via theoretical and numerical experiments. Normal incidence plane wave reflection/transmission by a thin geologic bed is amenable to analytic solution. Responses are calculated for beds that are conductive or resistive relative to the host rock. Preliminary results indicate the classic seismic resolution/detection limit of bed thickness ~1/8 wavelength is not achieved. EM responses for point or line current sources recorded by general acquisition geometries are calculated with a 3D finite-difference algorithm. These exhibit greater variability which may allow inference of bed thickness. We also examine composite responses of two point scatterers with separation when illuminated by an incident EM field. This is analogous to the Rayleigh resolution problem of estimating angular separation between two light sources. The First Born Approximation implies that perturbations in permittivity, permeability, and conductivity have different scattering patterns, which may be indicators of EM medium properties. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the US Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.

  12. Maintenance of Electrical Services: Maintenance and Renewal in Educational Buildings. Building Bulletin 76.

    ERIC Educational Resources Information Center

    Department for Education and Employment, London (England). Architects and Building Branch.

    This document provides guidance on the overall electrical services and maintenance strategy in educational facilities, the individual components of which are considered in the following sections: record documentation and systems; inspection and testing; condition appraisal; maintenance requirements; and maintenance works procedures. Other sections…

  13. Grounds Maintenance Equipment and Procedures. Building Maintenance. Module VI. Instructor's Guide.

    ERIC Educational Resources Information Center

    Crank, Virgil

    This curriculum guide, one of six modules keyed to the building maintenance competency profile developed by industry and education professionals, provides materials for two units on grounds maintenance equipment and procedures. The first unit deals with grounds maintenance equipment and includes the following lessons: safety; changing oil/filter…

  14. Results of Highway Maintenance Survey Prepared for

    E-print Network

    Almor, Amit

    Results of Highway Maintenance Survey Prepared for The SC Department of Transportation Prepared of Transportation In Cooperation with the United States Department of Transportation Federal Highway Administration #12;Results of Highway Maintenance Survey Executive Summary The use of surveys to elicit public

  15. Standardized Curriculum for General Industrial Maintenance Trades.

    ERIC Educational Resources Information Center

    Mississippi State Dept. of Education, Jackson. Office of Vocational, Technical and Adult Education.

    Standardized vocational education course titles and core contents for two courses in Mississippi are provided: general industrial maintenance trades I and II. The first course contains the following units: (1) orientation and leadership activities; (2) safety; (3) blueprint reading; (4) oxyacetylene cutting; (5) preventative maintenance; (6)…

  16. Software Testing and Maintenance 1 Regression Testing

    E-print Network

    Lei, Jeff Yu

    1 Software Testing and Maintenance 1 Regression Testing Introduction Test Selection Test Minimization Test Prioritization Summary Software Testing and Maintenance 2 What is it? Regression testing refers to the portion of the test cycle in which a program is tested to ensure that changes do not affect

  17. Preventive maintenance holds key to processing productivity

    SciTech Connect

    Carrieri, J.

    1983-11-01

    Preventive maintenance can be the means of ensuring processing productivity. Regular lubrication, spares and overhauling are part of effective preventive maintenance. However, the author also emphasises that other considerations, such as equipment selection, personnel training, inspection, early warning devices and continuous performance monitoring are also important.

  18. Effect of maintenance policies on FMS failures

    Microsoft Academic Search

    M. L. VINEYARD; J. R. MEREDITH

    1992-01-01

    The potential benefits of flexible manufacturing systems have been shown to be sensitive to maintenance policies. Much of the information being published, however, is based on policies developed and proven for conventional stand-alone machinery. This paper evaluates five of these maintenance policies in the complex, highly integrated, computerized environment of flexible manufacturing systems.

  19. Minor Maintenance. A Resource Manual for Custodians.

    ERIC Educational Resources Information Center

    Florida State Dept. of Education, Tallahassee.

    Areas of minor maintenance covered by this manual are--(1) electrical, (2) carpentry, (3) plumbing, (4) painting, and (5) masonry. Each area is defined, tools and equipment for maintenance are listed, and the job procedure is given. The description of electrical work also covers sources of electricity and power transmission. The description of…

  20. Robot Behavior Adaptation for Formation Maintenance

    E-print Network

    López-Sánchez, Maite

    1 Robot Behavior Adaptation for Formation Maintenance Maite López-Sánchez maite@maia.ub.es WAI) Acknowledgements: Bernat Grau Index · Introduction · Basic behaviors · Formation maintenance · Performance ­ inverted-V or wedge ­ rectangle or roman manipulus · Local information (behaviors) · No notion about

  1. Maintenance implementation plan for solid waste management

    SciTech Connect

    Reddinger, R.W., Westinghouse Hanford

    1996-06-27

    This Maintenance Implementation Plan (MIP)was developed for implementation of the U.S. Department of Energy (DOE) Order 4330.4A, A Maintenance Implementation Program (DOE 1990) which has been replaced by 4330.4B (DOE 1994) at the Hanford Site SWM complex. It addresses maintenance functions associated with SWM, which includes the field operational group and the facilities operational group. An assessment of the existing maintenance programs for SWM was performed, and the results of this assessment were evaluated to determine corrective actions required to bring Solid Waste Maintenance into compliance with the order. The objective of this MIP is to provide baseline information for the control and execution of SWM Maintenance activities relative to the requirements of Order 4330.4B, Chapter II. (Nuclear Facilities) It also describes actions that are planned to achieve compliance. Section 2.0 of this MIP summarizes the mission, history, and future plans of SWM. Section 3.0 describes maintenance scope and requirements, and outlines the overall strategy (both near- term and long-term) for implementing improvements to the maintenance program. Specific elements of DOE Order 4330.4B are addressed in Section 4.0, including objectives of each element, a discussion of how SWM addresses these objectives, proposed improvements, and references to Westinghouse Hanford Company (Westinghouse Hanford) policies and procedures. Section 5.0 addresses deviations from policy requirements, and Section 6.0 presents the implementation schedule for planned improvements.

  2. Competency-Based Horticulture: Turfgrass Maintenance Worker.

    ERIC Educational Resources Information Center

    College of DuPage, Glen Ellyn, IL.

    This competency-based horticulture curriculum guide is designed to provide secondary and postsecondary horticulture teachers with a task-oriented program for training turfgrass maintenance workers. It contains a master resource list, a listing of turfgrass maintenance resources available from various states, and 59 competency task sheets organized…

  3. Survey of Stormwater BMP Maintenance Practices

    Microsoft Academic Search

    Andrew J. Erickson; John S. Gulliver; Peter T. Weiss; C. Bruce Wilson

    Many stormwater management manuals and guidance documents have stated the importance and estimated frequency of maintenance for stormwater best management practices (BMPs), but few have documented the actual frequency and intensity of maintenance required to maintain a desired level of performance and efficiency. Increased attention to mass balance, numerical goals, total maximum daily loads (TMDLs), and non-degradation requirements has created

  4. School Bus Maintenance. Bulletin, 1948, No. 2

    ERIC Educational Resources Information Center

    Featherston, E. Glenn

    1948-01-01

    This bulletin is one in the series on pupil transportation issued by the Office of Education. Its purpose is to furnish information and guidance for local school administrators and others who are concerned with school bus maintenance. Programs of school bus maintenance vary among the 48 States. Presumably all contract vehicles are maintained by…

  5. Fair cost sharing of network maintenance

    Microsoft Academic Search

    Harunori Shishido

    2003-01-01

    A network used by agents or players is considered. Nodes of the network are divided into some players and maintenance costs are allocated among the players. The more the player uses the network, the higher the player has to pay. We can give actual examples like railway networks or expressway networks. We propose a fair sharing method of the maintenance

  6. TREE MAINTENANCE AND REMOVAL Table Of Contents

    E-print Network

    US Army Corps of Engineers

    EM 385-1-1 XX Sep 13 i Section 31 TREE MAINTENANCE AND REMOVAL Table Of Contents Section: Page 31.A General................... ......................................................31-1 31.B Tree Climbing.................................31-14 #12;EM 385-1-1 XX Sep 13 31-1 SECTION 31 TREE MAINTENANCE AND REMOVAL 31. A GENERAL 31.A.01

  7. TREE MAINTENANCE AND REMOVAL 31. A GENERAL

    E-print Network

    US Army Corps of Engineers

    EM 385-1-1 XX Jun 13 SECTION 31 TREE MAINTENANCE AND REMOVAL 31. A GENERAL 31.A.01 References. a, and Distribution; d. ANSI A300 ­ American National Standard for Tree Care Operations ­ Tree, Shrub, and Other Woody- Mounted Elevating and Rotating Aerial Devices. 31.A.02 Tree maintenance or removal shall be performed

  8. The Chemistry of Swimming Pool Maintenance

    ERIC Educational Resources Information Center

    Salter, Carl; Langhus, David L.

    2007-01-01

    The study of chemistry involved in the maintenance of a swimming pool provides a lot of chemical education to the students, including the demonstration of the importance of pH in water chemistry. The various chemical aspects hidden in the maintenance of the pool are being described.

  9. Asphalt, Concrete, and Turf Maintenance and Preservation

    E-print Network

    Minnesota, University of

    1 Asphalt, Concrete, and Turf Maintenance and Preservation Workshop Highlights In May 2003 of concrete, asphalt, and turf pavements. The workshop focused on the special materials required at airports sound pavement. Preventive maintenance is basically performing the right treatment on the right road (or

  10. Chart String Maintenance Project Caf Training

    E-print Network

    Shull, Kenneth R.

    Chart String Maintenance Project Café Training NUPlans Course FMS705 April 12, 2012 #12;Budget Analyze with Summaries and Reports Submit and Review Review Chart Strings and Add Accounts #12;2 Agenda · Introduce NUPlans Web · Walk through Chart String Maintenance Add Grant Proposal Add Account to Chart

  11. KINOFORM LENSES - TOWARD NANOMETER RESOLUTION.

    SciTech Connect

    STEIN, A.; EVANS-LUTTERODT, K.; TAYLOR, A.

    2004-10-23

    While hard x-rays have wavelengths in the nanometer and sub-nanometer range, the ability to focus them is limited by the quality of sources and optics, and not by the wavelength. A few options, including reflective (mirrors), diffractive (zone plates) and refractive (CRL's) are available, each with their own limitations. Here we present our work with kinoform lenses which are refractive lenses with all material causing redundant 2{pi} phase shifts removed to reduce the absorption problems inherently limiting the resolution of refractive lenses. By stacking kinoform lenses together, the effective numerical aperture, and thus the focusing resolution, can be increased. The present status of kinoform lens fabrication and testing at Brookhaven is presented as well as future plans toward achieving nanometer resolution.

  12. Subpixel resolution from multiple images

    NASA Technical Reports Server (NTRS)

    Cheeseman, Peter; Kanefsky, Rob; Stutz, John; Kraft, Richard

    1994-01-01

    Multiple images taken from similar locations and under similar lighting conditions contain similar, but not identical, information. Slight differences in instrument orientation and position produces mismatches between the projected pixel grids. These mismatches ensure that any point on the ground is sampled differently in each image. If all the images can be registered with respect to each other to a small fraction of a pixel accuracy, then the information from the multiple images can be combined to increase linear resolution by roughly the square root of the number of images. In addition, the gray-scale resolution of the composite image is also improved. We describe methods for multiple image registration and combination, and discuss some of the problems encountered in developing and extending them. We display test results with 8:1 resolution enhancement, and Viking Orbiter imagery with 2:1 and 4:1 enhancements.

  13. A multicriteria approach for risks assessment in ERP maintenance

    Microsoft Academic Search

    Jose L. Salmeron; Cristina Lopez

    2010-01-01

    Enterprise resource planning (ERP) systems cannot remain static after their implementation, they need maintenance. ERP maintenance is a key process required by the rapidly changing business environment and the usual software maintenance needs. However, these projects are highly complex and risky. So, the risks management associated with ERP maintenance projects is crucial to attain a satisfactory performance. Unfortunately, ERP maintenance

  14. Integration of maintenance strategies for improved asset reliability and availability

    Microsoft Academic Search

    N. K. K. Prasanna; Shakti Akula; Tushar N. Desai

    2011-01-01

    The simplicity and ruggedness of erstwhile ‘equipment sufficed maintenance’ used to revolve around preventive and run-to-failure methodology. With advancement in technology and arrival of complex machinery, the operational and maintenance philosophies have changed. Many maintenance management concepts, such as Reliability Centered Maintenance (RCM), Total Productive Maintenance (TPM), Total Quality Management (TQM) each having its own merits and demerits, have emerged.

  15. File Maintenance of MeSH Headings in MEDLINE.

    ERIC Educational Resources Information Center

    Humphrey, Susanne M.

    1984-01-01

    Emphasizes class maintenance of National Library of Medicine's bibliographic retrieval file in which maintenance actions (replacement, deletion, addition) reflect yearly changes in Medical Subject Headings (MeSH). File maintenance of other authoritative information attached to headings, class maintenance failures, checking class maintenance,…

  16. Proximity problems on moving points

    Microsoft Academic Search

    Julien Basch; Leonidas J. Guibas; Li Zhang

    1997-01-01

    A kinetic data structure for the maintenance of a multidimensional range search tree is introduced. This structure is used as a building block to obtain kinetic data structures for two classical geometric proximity problems in arbitrary dimensions: the first structure maintains the closest pair of a set of continuously moving points, and is provably efficient. The second structure maintains a

  17. Latent tree structure learning for cross-document coreference resolution

    E-print Network

    Shyu, Eric

    2014-01-01

    Cross Document Coreference Resolution (CDCR) is the problem of learning which mentions, coming from several different documents, correspond to the same entity. This thesis approaches the CDCR problem by first turning it ...

  18. A Practical Approach to Conflict Resolution.

    ERIC Educational Resources Information Center

    Araki, Charles T.

    1983-01-01

    Discusses a group problem-solving method in conflict resolution which consists of three phases: problem identification (four steps); analysis (two steps); and synthesis (three steps). A matrix format for evaluating alternative solutions in terms of essential and desirable criteria or conditions, with a complete analysis of each step, is included.…

  19. Bayesian Image Super-Resolution

    Microsoft Academic Search

    Michael E. Tipping; Christopher M. Bishop

    2002-01-01

    Abstract,The extraction of a single high-quality image from a set of low-resolution images is an important problem which arises in flelds such as remote sensing, surveillance, medical imaging and the extraction of still images from video. Typical approaches are based on the use of cross-correlation to register the images followed by the inversion of the transformation from the unknown high

  20. Portable Knowledge-Based Diagnostic And Maintenance Systems

    NASA Astrophysics Data System (ADS)

    Darvish, John; Olson, Noreen S.

    1989-03-01

    It is difficult to diagnose faults and maintain weapon systems because (1) they are highly complex pieces of equipment composed of multiple mechanical, electrical, and hydraulic assemblies, and (2) talented maintenance personnel are continuously being lost through the attrition process. To solve this problem, we developed a portable diagnostic and maintenance aid that uses a knowledge-based expert system. This aid incorporates diagnostics, operational procedures, repair and replacement procedures, and regularly scheduled maintenance into one compact, 18-pound graphics workstation. Drawings and schematics can be pulled up from the CD-ROM to assist the operator in answering the expert system's questions. Work for this aid began with the development of the initial knowledge-based expert system in a fast prototyping environment using a LISP machine. The second phase saw the development of a personal computer-based system that used videodisc technology to pictorially assist the operator. The current version of the aid eliminates the high expenses associated with videodisc preparation by scanning in the art work already in the manuals. A number of generic software tools have been developed that streamlined the construction of each iteration of the aid; these tools will be applied to the development of future systems.

  1. Designing a scrubber for maintenance

    SciTech Connect

    Mahlmeister, M.E.; Baron, E.S. [New York State Electric & Gas Corp., Binghamton, NY (United States); Watts, J. [Department of Energy, Pittsburgh, PA (United States)

    1996-07-01

    Under Round 4 of the U.S. Department of Energy`s (DOE) Clean Coal Technology program, New York State Electric & Gas Corporation (NYSEG), in partnership with Saarberg-Holter-Umwelttechnik (SHU), Consolidation Coal Company and Stebbins Engineering and Manufacturing Company, has retrofitted a formic acid enhanced forced oxidation wet limestone scrubber on Units 1 and 2 at the Milliken Steam Electric Station. Units 1 and 2 are 1950s vintage Combustion Engineering tangentially fired pulverized coal units, which are rated at nominal 150 MW each and operate in balanced draft mode. The Flue Gas Desulfurization (FGD) system for Unit 2 was placed into operation in January 1995 and the Unit 1 system in June 1995. The project incorporates several unique aspects: low pH operation; a ceramic tile-lined concurrent/countercurrent, split module absorber, a wet stack supported on the roof of the FGD building; and closed loop, zero liquid discharge operation that produces commercial grade gypsum and calcium chloride brine. The project objectives include 98% SO{sub 2} removal efficiency while burning high sulfur coal, the production of marketable byproducts to minimize solid waste disposal, zero wastewater discharge, space-saving design, and minimization of maintenance requirements of a wet scrubber.

  2. Enhancing Building Performance Through More Responsive Maintenance System 

    E-print Network

    Alsudairi, A. A.

    2012-01-01

    costs more than its initial cost. The aim of this study is to improve maintenance processes by simulating the concept of multi-skilled technician to an existing maintenance process. Statistical data and maintenance process map of Saudi Consolidated...

  3. 31 CFR 202.7 - Maintenance of balances within authorizations.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Maintenance of balances within authorizations. 202.7 Section...GOVERNMENT 1 § 202.7 Maintenance of balances within authorizations. (a...are responsible for the maintenance of balances in such accounts within the limits...

  4. 31 CFR 202.7 - Maintenance of balances within authorizations.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Maintenance of balances within authorizations. 202.7 Section...GOVERNMENT 1 § 202.7 Maintenance of balances within authorizations. (a...are responsible for the maintenance of balances in such accounts within the limits...

  5. 31 CFR 202.7 - Maintenance of balances within authorizations.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Maintenance of balances within authorizations. 202.7 Section...GOVERNMENT 1 § 202.7 Maintenance of balances within authorizations. (a...are responsible for the maintenance of balances in such accounts within the limits...

  6. 31 CFR 202.7 - Maintenance of balances within authorizations.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Maintenance of balances within authorizations. 202.7 Section...GOVERNMENT 1 § 202.7 Maintenance of balances within authorizations. (a...are responsible for the maintenance of balances in such accounts within the limits...

  7. 31 CFR 202.7 - Maintenance of balances within authorizations.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Maintenance of balances within authorizations. 202.7 Section...GOVERNMENT 1 § 202.7 Maintenance of balances within authorizations. (a...are responsible for the maintenance of balances in such accounts within the limits...

  8. 49 CFR 238.503 - Inspection, testing, and maintenance requirements.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 2011-10-01 false Inspection, testing, and maintenance requirements. 238...EQUIPMENT SAFETY STANDARDS Inspection, Testing, and Maintenance Requirements for Tier...Equipment § 238.503 Inspection, testing, and maintenance requirements....

  9. 49 CFR 238.503 - Inspection, testing, and maintenance requirements.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 2012-10-01 false Inspection, testing, and maintenance requirements. 238...EQUIPMENT SAFETY STANDARDS Inspection, Testing, and Maintenance Requirements for Tier...Equipment § 238.503 Inspection, testing, and maintenance requirements....

  10. 49 CFR 238.503 - Inspection, testing, and maintenance requirements.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 2013-10-01 false Inspection, testing, and maintenance requirements. 238...EQUIPMENT SAFETY STANDARDS Inspection, Testing, and Maintenance Requirements for Tier...Equipment § 238.503 Inspection, testing, and maintenance requirements....

  11. 49 CFR 238.503 - Inspection, testing, and maintenance requirements.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 2014-10-01 false Inspection, testing, and maintenance requirements. 238...EQUIPMENT SAFETY STANDARDS Inspection, Testing, and Maintenance Requirements for Tier...Equipment § 238.503 Inspection, testing, and maintenance requirements....

  12. 49 CFR 192.745 - Valve maintenance: Transmission lines.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Valve maintenance: Transmission lines. 192...STANDARDS Maintenance § 192.745 Valve maintenance: Transmission lines. (a) Each transmission line valve that might be required during any...

  13. 49 CFR 192.747 - Valve maintenance: Distribution systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 2013-10-01 2013-10-01 false Valve maintenance: Distribution systems. 192...SAFETY STANDARDS Maintenance § 192.747 Valve maintenance: Distribution systems. (a) Each valve, the use of which may be necessary...

  14. 49 CFR 192.745 - Valve maintenance: Transmission lines.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Valve maintenance: Transmission lines. 192...STANDARDS Maintenance § 192.745 Valve maintenance: Transmission lines. (a) Each transmission line valve that might be required during any...

  15. 49 CFR 192.747 - Valve maintenance: Distribution systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 2011-10-01 2011-10-01 false Valve maintenance: Distribution systems. 192...SAFETY STANDARDS Maintenance § 192.747 Valve maintenance: Distribution systems. (a) Each valve, the use of which may be necessary...

  16. 40 CFR 63.105 - Maintenance wastewater requirements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Maintenance wastewater requirements. 63.105 Section...Industry § 63.105 Maintenance wastewater requirements. (a) Each owner...tasks that are anticipated to create wastewater during maintenance activities....

  17. 40 CFR 63.105 - Maintenance wastewater requirements.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Maintenance wastewater requirements. 63.105 Section...Industry § 63.105 Maintenance wastewater requirements. (a) Each owner...tasks that are anticipated to create wastewater during maintenance activities....

  18. 40 CFR 63.105 - Maintenance wastewater requirements.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Maintenance wastewater requirements. 63.105 Section...Industry § 63.105 Maintenance wastewater requirements. (a) Each owner...tasks that are anticipated to create wastewater during maintenance activities....

  19. BAYESIAN HIGH RESOLUTION IMAGE RECONSTRUCTION WITH INCOMPLETE MULTISENSOR LOW RESOLUTION SYSTEMS

    E-print Network

    Granada, Universidad de

    observations. With the use of block-semi circulant matrices we show that all the matrix calcu- lations involved- resolution image reconstruction problem becomes singular). The normalized horizontal and vertical

  20. Does the Health Maintenance Facility Provide Speciality Capabilities?

    NASA Technical Reports Server (NTRS)

    Boyce, Joey; Wurgler, James; Broadwell, Kim; Martin, William; Stiernberg, Charles M.; Bove, Alfred; Fromm, Rob; O'Neill, Daniel

    1991-01-01

    The Health Maintenance Facility (HMF) is capable of handling all minor illnesses, most moderate illnesses, and some major illnesses on board a space station. Its primary purpose should be to treat problems that are mission threatening, not life threatening. The HMF will have greater medical capabilities than those currently on Navy submarines. Much of the discussion in this document focuses on the possibilities of treating specific medical conditions on board a space station. The HMF will be limited to caring for critically ill patients for a few days, so a crew return vehicle will be important.

  1. Effective maintenance practices to manage system aging

    SciTech Connect

    Chockie, A.; Bjorkelo, K.

    1992-01-01

    For a variety of economic and technical reasons, there has been a growing concern with the aging of complex systems and components and the role that maintenance can play in reducing this degradation. A study for the Nuclear Regulatory Commission was recently undertaken to identify effective maintenance practices that could be adapted by the nuclear industry in the United States to assist in managing the aging degradation of plant systems and components. Four organizations were examined to assess the influence that their maintenance programs have on their ability to address the systems and component aging degradation issues. An effective maintenance program was found to be essential to the management of system and component aging. The four key elements of an effective maintenance program that are important to an aging management program were identified. These are: the selection of critical systems and components; the development of an understanding of aging through the collection and analysis of equipment performance information; the development of appropriate preventive and predictive maintenance tasks to manage equipment and system aging degradation; the use of feedback mechanisms to continuously improve the management of aging systems and components. These elements were found to be common to all four organizations. In examining how the four organizations have structured their maintenance programs to include these key elements provides valuable lessons not only for the nuclear power industry, but also for any industrial organization that is concerned with the management of system and component aging degradation. This document provides detail, of these studies.

  2. Super resolution image reconstruction using averaged image and regularized deconvolution

    Microsoft Academic Search

    2012-01-01

    Super resolution (SR) image reconstruction is used to obtain a high resolution (HR) image from multiple low resolution (LR) images. In this paper, we propose a new method to solve the SR reconstruction problem. The LR images are modeled as downsampled images of the original scene shifted by sub-pixel distances. In addition, we model the downsampling process as averaging light

  3. Resolution analysis for imaging with noise Josselin Garnier1

    E-print Network

    Garnier, Josselin

    Resolution analysis for imaging with noise Josselin Garnier1 and George Papanicolaou2 1 Laboratoire.30.Wb Submitted to: Inverse Problems #12;Resolution analysis for imaging with noise 2 1. Introduction 94305 E-mail: papanico@math.stanford.edu,garnier@math.jussieu.fr Abstract. We analyze the resolution

  4. Tight Frame Based Method for High-Resolution Image Reconstruction

    E-print Network

    Chan, Raymond

    Tight Frame Based Method for High-Resolution Image Reconstruction Jian-Feng Cai Raymond Chan Lixin the problem of high-resolution image reconstruction and the associated matrix representation of the filters for various boundary extensions. We then propose three algorithms for high-resolution image reconstruction

  5. RESOLUTION IMPROVEMENT FOR COMPOUND EYE IMAGES THROUGH LENS DIVERSITY

    E-print Network

    Rajan, Dinesh

    RESOLUTION IMPROVEMENT FOR COMPOUND EYE IMAGES THROUGH LENS DIVERSITY Sally L. Wood1 Dinesh Rajan2 Methodist University Dallas, Texas, 75275 USA ABSTRACT Reconstruction of high resolution images from multiple low resolution images at various displacements is a well studied, ill posed problem. Designs using

  6. A Latent Dirichlet Allocation Model for Entity Resolution

    Microsoft Academic Search

    Indrajit Bhattacharya; Lise Getoor

    In this paper, we address the problem of entity resolution, where given many references to un- derlying objects, the task is to predict which references correspond to the same object. We propose a probabilistic model for collective entity resolution. Our approach differs from other recently pro- posed entity resolution approaches in that it is a) unsupervised, b) generative and c)

  7. Noisy image super-resolution with sparse mixing estimators

    Microsoft Academic Search

    Fang Qiu; Yi Xu; Ci Wang; Yuhong Yang

    2011-01-01

    Image super-resolution reconstruction (SR) has drawn a lot of attentions lately. But almost all existing SR algorithms do not consider about the noisy image SR problem. This paper proposes a novel super-resolution algorithm for noisy images based on sparse mixing estimators. Firstly, sparse mixing estimators are introduced to achieve a directional and sparse representation of noisy low resolution (LR) image.

  8. Regularized super resolution methods for light field images

    NASA Astrophysics Data System (ADS)

    Zhou, Shubo; Yuan, Yan; Su, Lijuan

    2013-12-01

    As the LR images from the plenoptic camera is greatly constrained by the number of micro-lenses, we can apply the multi-frame super resolution methods to enhance the spatial resolution. Multi-frame super resolution reconstruction is a technology which obtains a high resolution image from several low resolution images of the same scene. Among various super resolution methods, the regularized methods are widely used since they have advantages for solving the ill posed problems. In this paper, some regularized super resolution methods are applied to enhance the spatial resolution of the light field image. The reconstruction results of synthetic low resolution images confirm that all the regularized super resolution algorithm can suppress the Gaussian noise and preserve the edge information. The real data experiment results also confirm the effectiveness of the applied algorithms.

  9. Long Length Contaminated Equipment Maintenance Plan

    SciTech Connect

    ESVELT, C.A.

    2000-02-01

    The purpose of this document is to provide the maintenance requirements of the Long Length Contaminated Equipment (LLCE) trailers and provide a basis for the maintenance frequencies selected. This document is applicable to the LLCE Receiver trailer and Transport trailer assembled by Mobilized Systems Inc. (MSI). Equipment used in conjunction with, or in support of, these trailers is not included. This document does not provide the maintenance requirements for checkout and startup of the equipment following the extended lay-up status which began in the mid 1990s. These requirements will be specified in other documentation.

  10. Magnetically Attached Multifunction Maintenance Rover

    NASA Technical Reports Server (NTRS)

    Bar-Cohen, Yoseph; Joffe, Benjamin

    2005-01-01

    A versatile mobile telerobot, denoted the magnetically attached multifunction maintenance rover (MAGMER), has been proposed for use in the inspection and maintenance of the surfaces of ships, tanks containing petrochemicals, and other large ferromagnetic structures. As its name suggests, this robot would utilize magnetic attraction to adhere to a structure. As it moved along the surface of the structure, the MAGMER would perform tasks that could include close-up visual inspection by use of video cameras, various sensors, and/or removal of paint by water-jet blasting, laser heating, or induction heating. The water-jet nozzles would be mounted coaxially within compressed-air-powered venturi nozzles that would collect the paint debris dislodged by the jets. The MAGMER would be deployed, powered, and controlled from a truck, to which it would be connected by hoses for water, compressed air, and collection of debris and by cables for electric power and communication (see Figure 1). The operation of the MAGMER on a typical large structure would necessitate the use of long cables and hoses, which can be heavy. To reduce the load of the hoses and cables on the MAGMER and thereby ensure its ability to adhere to vertical and overhanging surfaces, the hoses and cables would be paid out through telescopic booms that would be parts of a MAGMER support system. The MAGMER would move by use of four motorized, steerable wheels, each of which would be mounted in an assembly that would include permanent magnets and four pole pieces (see Figure 2). The wheels would protrude from between the pole pieces by only about 3 mm, so that the gap between the pole pieces and the ferromagnetic surface would be just large enough to permit motion along the surface but not so large as to reduce the magnetic attraction excessively. In addition to the wheel assemblies, the MAGMER would include magnetic adherence enhancement fixtures, which would comprise arrays of permanent magnets and pole pieces that could be adjusted to maximize or minimize the overall attractive magnetic force. Even with a paint thickness of 2 mm, a preliminary design provides a safety factor of 5 in the magnetic force in the upside- down, water-jets-operating condition, in which the total load (including the weight of the MAGMER and cables and the water-jet force) would be about 260 lb (the weight of 118 kg). Optionally, the MAGMER could carry magnetic shielding and/or could be equipped with a demagnetizing module to remove residual magnetism from the structure. The MAGMER would carry four charge-coupled-device cameras for visual inspection, monitoring of operation, navigation, and avoidance of collisions with obstacles. The control system of the MAGMER would include navigation and collision-avoidance subsystems that would utilize surface features as landmarks, in addition to direct images of obstacles.

  11. Operation and Maintenance Manual for

    E-print Network

    Kleinfeld, David

    the Foredom Micromotor Handpiece. HP4-917 Control HP4-933 Cradle HP4-960 Foot Control H.MH-170 Handpiece(s), a packing list, and information regarding the problem or repairs required. Estimates of repair cost (labor plus parts) is more than fifty percent of the cost for a new replacement.You will be notified

  12. Towards better entity resolution techniques for Web document collections

    E-print Network

    Aberer, Karl

    -oriented search. We address this disambiguation problem, which is very similar to the entity resolution problemTowards better entity resolution techniques for Web document collections Surender Reddy Yerva #1-unique, the same name on different Web pages might or might not refer to the same real-world person. This entity

  13. A performance improvement case study in aircraft maintenance and its implications for hazard identification.

    PubMed

    Ward, Marie; McDonald, Nick; Morrison, Rabea; Gaynor, Des; Nugent, Tony

    2010-02-01

    Aircraft maintenance is a highly regulated, safety critical, complex and competitive industry. There is a need to develop innovative solutions to address process efficiency without compromising safety and quality. This paper presents the case that in order to improve a highly complex system such as aircraft maintenance, it is necessary to develop a comprehensive and ecologically valid model of the operational system, which represents not just what is meant to happen, but what normally happens. This model then provides the backdrop against which to change or improve the system. A performance report, the Blocker Report, specific to aircraft maintenance and related to the model was developed gathering data on anything that 'blocks' task or check performance. A Blocker Resolution Process was designed to resolve blockers and improve the current check system. Significant results were obtained for the company in the first trial and implications for safety management systems and hazard identification are discussed. Statement of Relevance: Aircraft maintenance is a safety critical, complex, competitive industry with a need to develop innovative solutions to address process and safety efficiency. This research addresses this through the development of a comprehensive and ecologically valid model of the system linked with a performance reporting and resolution system. PMID:20099178

  14. EMMA: The expert system for munition maintenance

    NASA Technical Reports Server (NTRS)

    Mullins, Barry E.

    1988-01-01

    Expert Missile Maintenance Aid (EMMA) is a first attempt to enhance maintenance of the tactical munition at the field and depot level by using artificial intelligence (AI) techniques. The ultimate goal of EMMA is to help a novice maintenance technician isolate and diagnose electronic, electromechanical, and mechanical equipment faults to the board/chassis level more quickly and consistently than the best human expert using the best currently available automatic test equipment (ATE). To this end, EMMA augments existing ATE with an expert system that captures the knowledge of design and maintenance experts. The EMMA program is described, including the evaluation of field-level expert system prototypes, the description of several study tasks performed during EMMA, and future plans for a follow-on program. This paper will briefly address several study tasks performed during EMMA. The paper concludes with a discussion of future plans for a follow-on program and other areas of concern.

  15. Risk impact of maintenance program changes

    E-print Network

    Credit, Kimberly A. (Kimberly April)

    1992-01-01

    This study quantifies the change in one measure of plant risk, the frequency of loss of long-term decay heat removal, due to changes in maintenance at the James A. Fitzpatrick (JAF) plant. Quantification is accomplished ...

  16. Information Technology for Energy and Maintenance Management 

    E-print Network

    Villafana, L.; Federspiel, C.

    2003-01-01

    We describe the design of a tenant interface for energy and maintenance systems (TIEMS) in commercial buildings. TIEMS is designed for use by occupants (tenants) of commercial buildings. Our hypothesis is that by allowing tenants access...

  17. Self-Esteem Maintenance in Family Dynamics.

    ERIC Educational Resources Information Center

    Tesser, Abraham

    1980-01-01

    In this study, a self-esteem maintenance model is introduced and is used to test predictions about sibling identification, sibling friction, and the closeness of father-son relationships as they relate to sibling performance. (Author/SS)

  18. 23 CFR 660.115 - Maintenance.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...SPECIAL PROGRAMS (DIRECT FEDERAL) Forest Highways § 660.115 Maintenance. The cooperator having jurisdiction over a FH shall, upon acceptance of the project in accordance with § 660.113(c), assume operation responsibilities and maintain, or...

  19. 23 CFR 660.115 - Maintenance.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...SPECIAL PROGRAMS (DIRECT FEDERAL) Forest Highways § 660.115 Maintenance. The cooperator having jurisdiction over a FH shall, upon acceptance of the project in accordance with § 660.113(c), assume operation responsibilities and maintain, or...

  20. 23 CFR 660.115 - Maintenance.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...SPECIAL PROGRAMS (DIRECT FEDERAL) Forest Highways § 660.115 Maintenance. The cooperator having jurisdiction over a FH shall, upon acceptance of the project in accordance with § 660.113(c), assume operation responsibilities and maintain, or...

  1. 23 CFR 660.115 - Maintenance.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...SPECIAL PROGRAMS (DIRECT FEDERAL) Forest Highways § 660.115 Maintenance. The cooperator having jurisdiction over a FH shall, upon acceptance of the project in accordance with § 660.113(c), assume operation responsibilities and maintain, or...

  2. 23 CFR 660.115 - Maintenance.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...SPECIAL PROGRAMS (DIRECT FEDERAL) Forest Highways § 660.115 Maintenance. The cooperator having jurisdiction over a FH shall, upon acceptance of the project in accordance with § 660.113(c), assume operation responsibilities and maintain, or...

  3. Maintenance = reuse-oriented software development

    NASA Technical Reports Server (NTRS)

    Basili, Victor R.

    1989-01-01

    Maintenance is viewed as a reuse process. In this context, a set of models that can be used to support the maintenance process is discussed. A high level reuse framework is presented that characterizes the object of reuse, the process for adapting that object for its target application, and the reused object within its target application. Based upon this framework, a qualitative comparison is offered of the three maintenance process models with regard to their strengths and weaknesses and the circumstances in which they are appropriate. To provide a more systematic, quantitative approach for evaluating the appropriateness of the particular maintenance model, a measurement scheme is provided, based upon the reuse framework, in the form of an organized set of questions that need to be answered. To support the reuse perspective, a set of reuse enablers are discussed.

  4. Probabilistic Weather Forecasting for Winter Road Maintenance

    E-print Network

    Washington at Seattle, University of

    Probabilistic Weather Forecasting for Winter Road Maintenance Veronica J. Berrocal, Adrian E are needed. Currently, anti-icing decisions are usually based on deterministic weather forecasts. However. Starting with deterministic numerical weather predictions, they produce a joint predictive probability dis

  5. Maintenance Downtime January 10 - 11, 2015

    Atmospheric Science Data Center

    2015-01-05

    ... outage this weekend, January 10-11,  all our external websites hosted on-Center will be impacted. You may experience sporadic accessibility to these websites during the maintenance period. Please plan your data orders and ...

  6. Sound maintenance practices protect fan investments

    SciTech Connect

    Bauer, M.

    2009-11-15

    Since underground coal miners depend on axial fans, lack of maintenance could prove costly. A number of pre-emptive actions that can help keep fans running at optimal performance can also be taken. 2 photos.

  7. 14 CFR 91.1113 - Maintenance recordkeeping.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...AND GENERAL OPERATING RULES GENERAL OPERATING AND FLIGHT RULES Fractional Ownership Operations Program Management § 91.1113 Maintenance recordkeeping. Each fractional ownership program manager must keep (using the system specified...

  8. 14 CFR 91.1111 - Maintenance training.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...DEPARTMENT OF TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES GENERAL OPERATING AND FLIGHT RULES Fractional Ownership Operations Program Management § 91.1111 Maintenance training. The program manager must ensure that...

  9. Indirectly predicting the maintenance effort of

    E-print Network

    Bae, Doo-Hwan

    maintenance effort measures Empirical study NASA SEL projects LINUX project Conclusion Discussion #12-source software Developed by a single company Source code is kept secret Normally copyrighted or patented Legally

  10. A case model for predictive maintenance

    E-print Network

    Li, Jiawei, M. Eng. Massachusetts Institute of Technology

    2008-01-01

    This project is to respond to a need by Varian Semiconductor Equipment Associates, Inc. (VSEA) to help predict failure of ion implanters. Predictive maintenance would help to reduce the unscheduled downtime of ion implanters, ...

  11. Maintenance implementation plan for fuel supply shutdown

    SciTech Connect

    Stephenson, R.L.

    1995-06-01

    This Maintenance Implementation Plan is written to satisfy the requirements of DOE Order 4330.4B, ``MAINTENANCE MANAGEMENT PROGRAM``, that specifies the general policy and objectives for the establishment of DOE controlled maintenance programs. These Programs provide for the management and performance of cost-effective maintenance and repair of Department of Energy (DOE) property, which includes facilities. A review of DOE Order 4330.4B, particularly Chapter II the nuclear portion, against existing WHC site programs and policies has provided assurance that most requirements of this order have already been implemented by existing WHC programs. Applicable requirements and guidelines of 4330.4B that are deficient or not implemented are presently being developed and implemented through WHC site policies and programs. Where no program is presently identified or being developed for 4330.4B requirements, responsibility for implementation has been assigned within this plan.

  12. Implementing lean methodologies within a maintenance organization

    E-print Network

    Levine, Dana Ari

    2009-01-01

    The primary goal of the project was to make the machine maintenance process more efficient. In order to do this, we conducted a 3-day Value Stream Mapping workshop, during which we generated a map of the present value ...

  13. Attitude Determination and Control System (ADCS) and Maintenance and Diagnostic System (MDS): A maintenance and diagnostic system for Space Station Freedom

    NASA Technical Reports Server (NTRS)

    Toms, David; Hadden, George D.; Harrington, Jim

    1990-01-01

    The Maintenance and Diagnostic System (MDS) that is being developed at Honeywell to enhance the Fault Detection Isolation and Recovery system (FDIR) for the Attitude Determination and Control System on Space Station Freedom is described. The MDS demonstrates ways that AI-based techniques can be used to improve the maintainability and safety of the Station by helping to resolve fault anomalies that cannot be fully determined by built-in-test, by providing predictive maintenance capabilities, and by providing expert maintenance assistance. The MDS will address the problems associated with reasoning about dynamic, continuous information versus only about static data, the concerns of porting software based on AI techniques to embedded targets, and the difficulties associated with real-time response. An initial prototype was built of the MDS. The prototype executes on Sun and IBM PS/2 hardware and is implemented in the Common Lisp; further work will evaluate its functionality and develop mechanisms to port the code to Ada.

  14. 3-D Rat Brain Phantom for High-Resolution Molecular Imaging: Experimental studies aimed at advancing understanding of human brain disease and malfunction, and of behavior problems, may be aided by computer models of small laboratory animals

    Microsoft Academic Search

    F. J. Beekman; B. Vastenhouw; G. Van der Wilt; M. Vervloet; R. Visscher; J. Booij; M. Gerrits; C. Ji; R. Ramakers; F. Van der Have

    2009-01-01

    With the steadily improving resolution of novel small-animal single photon emission computed tomography (SPECT) and positron emission tomography devices, highly detailed phantoms are required for testing and optimizing these systems. We present a three-dimensional (3-D) digital and physical phantom pair to represent, e.g., cerebral blood flow, glucose metabolism, or neuroreceptor binding in small regions of the rat brain. The anatomical

  15. Mathematical Problems of Thermoacoustic Tomography 

    E-print Network

    Nguyen, Linh V.

    2010-10-12

    Thermoacoustic tomography (TAT) is a newly emerging modality in biomedical imaging. It combines the good contrast of electromagnetic and good resolution of ultrasound imaging. The mathematical model of TAT is the observability problem for the wave...

  16. PROACTIVE VERSUS REACTIVE MAINTENANCE MEASUREMENT\\/IMPROVEMENT

    Microsoft Academic Search

    B Bigdeli; S Safi

    Maintenance data (i.e. work orders) for one fiscal year 2002\\/2003 in a large Alumina refinery is investigated in an attempt to established short, medium and long-term maintenance improvement strategies. Data set included more than 61,000 individual work orders with a total amount of actual cost recorded as high as $63m with more than 330,000 hours of actual work registered in

  17. Maintenance Implementation Plan for the Grout Facility

    SciTech Connect

    Yoakum, A.K.

    1993-08-01

    The objective of the Maintenance Implementation Plan (MIP) is to describe how the Grout Treatment Facility will implement the requirements established by US Department of Energy (DOE) Order 4330.4A, Maintenance Management Program, Chapter 2.0 Nuclear Facilities (DOE 1990). The plan provides a blueprint for a disciplined approach to implementation and compliance. Each element of the order is prioritized, categorized, and then placed into one of three phases for implementation.

  18. NASA work unit system file maintenance manual

    NASA Technical Reports Server (NTRS)

    1972-01-01

    The NASA Work Unit System is a management information system for research tasks (i.e., work units) performed under NASA grants and contracts. It supplies profiles on research efforts and statistics on fund distribution. The file maintenance operator can add, delete and change records at a remote terminal or can submit punched cards to the computer room for batch update. The system is designed for file maintenance by a person with little or no knowledge of data processing techniques.

  19. Preventive maintenance, the key to increased productivity

    SciTech Connect

    Bradbury, P.; Beatty, B.

    1982-12-01

    In order to increase availability of equipment and therefore increase productivity, a new Preventive Maintenance Program was developed at Martin County Coal Corporation. Over the course of the first two years of the program, software and the method of compiling input information was developed. As soon as the program was in motion an increase in equipment availability was realized. As the program progressed, overburden removal and coal production began an upward trend while maintenance cost began to drop.

  20. Inconsistency Resolution Method for RBAC Based Interoperation

    NASA Astrophysics Data System (ADS)

    Huang, Chao; Sun, Jianling; Wang, Xinyu; Wu, Di

    In this paper, we propose an inconsistency resolution method based on a new concept, insecure backtracking role mapping. By analyzing the role graph, we prove that the root cause of security inconsistency in distributed interoperation is the existence of insecure backtracking role mapping. We propose a novel and efficient algorithm to detect the inconsistency via finding all of the insecure backtracking role mappings. Our detection algorithm will not only report the existence of inconsistency, but also generate the inconsistency information for the resolution. We reduce the inconsistency resolution problem to the known Minimum-Cut problem, and based on the results generated by our detection algorithm we propose an inconsistency resolution algorithm which could guarantee the security of distributed interoperation. We demonstrate the effectiveness of our approach through simulated tests and a case study.

  1. Underwater maintenance guide: A guide to diving and remotely operated vehicle operations for nuclear maintenance personnel

    SciTech Connect

    Jenco, J. (Jenco (J.M.) and Associates, Inc., Covington, LA (USA))

    1990-12-01

    This Underwater Maintenance Guide has been developed to provide utility plant personnel with a single-source reference to underwater services. These services, which include both manned diving and remotely-operated vehicle operations, are required to perform certain underwater maintenance functions at nuclear power generating stations. This Guide provides an introduction to those underwater services and their general operations, as well as overviews of specific work tasks which have been identified thus far. This information is intended to familiarize utility maintenance personnel with the general scope and capabilities of underwater services, without encroaching upon the contractor's flexibility to develop responses to individual maintenance tasks.

  2. Axial resolution in elastography

    Microsoft Academic Search

    Raffaella Righetti; Jonathan Ophir; Periklis Ktonas

    2002-01-01

    The limits and trade-offs of the axial resolution in elastography were investigated using a controlled simulation study. The axial resolution in elastography was estimated as the distance between the full widths at half-maximum of the strain profiles of two equally stiff lesions embedded in a softer homogeneous background. The results show that the upper bound of the axial resolution in

  3. Machine performance monitoring and proactive maintenance in computer-integrated manufacturing: review and perspective

    Microsoft Academic Search

    JAY LEE

    1995-01-01

    A major problem confronting American manufacturers today is how lo economically achieve high quality in the goods which they manufacture. Equipment reliability and maintenance drastically affect the three key elements of competitiveness: quality, cost and product lead time. Well-maintained machines hold tolerances better, help reduce scrap and rework, and raise consistency and quality of the part. They increase uptime and

  4. The passing of the shift in aircraft maintenance--a task that produces deaths.

    PubMed

    Campos, Reginaldo; Martins, Edgard; Soares, Marcelo

    2012-01-01

    Maintenance tasks, especially in heavy maintenance, may not be completed in a single shift. Aircraft maintenance technicians often take work in progress by colleagues, and spend the incomplete work for a change of team. The need for accuracy and efficiency of information transfer in many cases, without having time to have a meeting to pass the service is a crucial aspect of maintenance work. The ideal shift change can occur normally before delivery and continues to proceed normally after delivery. Although a shift change create challenges for communication, they also offer opportunities to detect and correct errors, where the task of delivery is an opportunity to identify the problem and fix it. In this case, the task was done correctly the first round, however, a problem began when the second round took. One example is a case in which the first round have removed a defective part for replacement and let the component of aircraft at end of turn with problems. Instead of ordering and installation of an operational component, the second round was then reinstall the faulty component, not realizing he had information about the problem attached. PMID:22316725

  5. The passing of the shift in aircraft maintenance - a task that produces deaths.

    PubMed

    Campos, Reginaldo; Martins, Edgard; Soares, Marcelo M

    2012-01-01

    Maintenance tasks, especially in heavy maintenance, may not be completed in a single shift. Aircraft maintenance technicians often take work in progress by colleagues, and spend the incomplete work for a change of team. The need for accuracy and efficiency of information transfer in many cases, without having time to have a meeting to pass the service is a crucial aspect of maintenance work. The ideal shift change can occur normally before delivery and continues to proceed normally after delivery. Although a shift change create challenges for communication, they also offer opportunities to detect and correct errors, where the task of delivery is an opportunity to identify the problem and fix it. In this case, the task was done correctly the first round, however, a problem began when the second round took. One example is a case in which the first round have removed a defective part for replacement and let the component of aircraft at end of turn with problems. Instead of ordering and installation of an operational component, the second round was then reinstall the faulty component, not realizing he had information about the problem attached. PMID:22317554

  6. Field of Pipe Dreams: Minimizing Maintenance Cost for Hand-Moved

    E-print Network

    Morrow, James A.

    maintenance time without sacrificing water distribution uniformity. In this particular problem, we are asked to determine the radial distribution of water ejected from a sprinkler head. · Finally, we used the radial, and · the radial distribution of water ejected by the sprinkler. With this information we can use an algorithm

  7. A review of the impact of l-carnitine therapy on patient functionality in maintenance hemodialysis

    Microsoft Academic Search

    Brent Miller; Suhail Ahmad

    2003-01-01

    Goals of maintenance hemodialysis therapy include not only the preservation of an individual patient’s life in the presence of kidney failure, but also restoration of optimal quality of life. Although many conceptual and method problems are associated with the definition and assessment of quality of life in the chronically ill, there is broad agreement that patient quality of life is

  8. A Case Study: Implementing an Interactive Video Instruction System in Teaching Electronics and Industrial Maintenance.

    ERIC Educational Resources Information Center

    Shipe, Ron; And Others

    A study examined the development and implementation of an interactive video instruction system for teaching electronics and industrial maintenance at the University of Tennessee. The specific purposes of the study were to document unusual problems that may be encountered when this new technology is implemented, suggest corrective actions, and…

  9. SHINOBI: A Real-Time Code Clone Detection Tool for Software Maintenance

    Microsoft Academic Search

    Takanobu Yamashina; Hidetake Uwano; Kyohei Fushida; Yasutaka Kamei; Masataka Nagura; Shinji Kawaguchi; Hajimu Iida

    Recent research describes how code clones in source code decrease reliability of the program and require more development cost. To solve the problem, several code clone detection methods and tools have been implemented. In this paper, we propose a novel code clone detection\\/modification tool to support the software maintenance process. The proposed tool, SHINOBI, indicates code clones in source code

  10. Repair and maintenance of fiber optic data links on Navy aircraft

    Microsoft Academic Search

    Eric Fryland

    1992-01-01

    This paper will examine the problems and concerns of repairing fiber optic data links on carrier based Navy aircraft and will present the results of fiber optic splice testing that was performed aboard the USS Abraham Lincoln (CVN-72) in January 1991. Mechanical splicing of 50\\/125 micrometer fiber was performed at the various Navy maintenance levels in order to quantify the

  11. On-site diagnostic technique for smart maintenance of power cables

    Microsoft Academic Search

    Mahmoud Abou-Dakka; Alexander Bulinski; Soli S. Bamji

    2011-01-01

    Polymeric insulation of power cables has excellent short-term dielectric properties but is subjected to serious degra- dation problems due to defects, water, ionic contamination, par- tial discharges, electrical treeing, etc. Since more than 20% of installed underground power cables are older than their design life-time, utilities are faced with important maintenance related questions whether to repair, refurbish or completely replace

  12. An algorithm for thermal unit maintenance scheduling through combined use of GA, SA and TS

    Microsoft Academic Search

    Hyunchul Kim; Yasuhiro Hayashi; Koichi Nara

    1997-01-01

    This paper describes a method of solving a large scale long-term thermal generating unit maintenance scheduling problem. In the solution algorithm, the genetic algorithm (GA), simulated annealing (SA) and the tabu search (TS) method are used cooperatively. The solution algorithm keeps the advantages of the individual algorithms and shows a reasonable combination of local and global searches. The method takes

  13. Examining the Relationship Between Passenger Airline Aircraft Maintenance Outsourcing and Aircraft Safety

    Microsoft Academic Search

    Kari L. Monaghan

    2011-01-01

    The problem addressed was the concern for aircraft safety rates as they relate to the rate of maintenance outsourcing. Data gathered from 14 passenger airlines: AirTran, Alaska, America West, American, Continental, Delta, Frontier, Hawaiian, JetBlue, Midwest, Northwest, Southwest, United, and USAir covered the years 1996 through 2008. A quantitative correlational design, utilizing Pearson's correlation coefficient, and the coefficient of determination

  14. The maintenance of vocal learning by gene-culture interaction: the cultural trap hypothesis

    Microsoft Academic Search

    Robert F. Lachlan; Peter J. B. Slater

    1999-01-01

    Vocal learning has evolved in several groups of animals, yet the reasons for its origins and maintenance are controversial, with none of the theories put forward appearing to apply over a broad range of species. The theory of gene-culture coevolution is applied to this problem taking the speci¢c case of the mainte- nance of song learning in birds. The interaction

  15. Research on the Optimization Strategy of Maintenance Spare Parts Inventory Management for Petrochemical Vehicle

    Microsoft Academic Search

    Huang Jianfeng; Zhao Jingying; Wu Xiaodong

    2011-01-01

    Inventory control of spare parts is essential to many organizations, since excess inventory leads to high holding costs and stock outs can have a great impact on operations performance. The paper analyses and summarizes a series problems exiting in the department of petrochemical locomotive maintenance, and presents an optimization strategy for its spare parts inventory management. Firstly, it builds an

  16. Good School Maintenance. A Manual of Programs and Procedures for Buildings--Grounds--Equipment.

    ERIC Educational Resources Information Center

    Harroun, Jack T., Ed.

    This guide provides a basic program for managers and supervisors responsible for the care of buildings, grounds, and equipment; provides the maintenance staff member with basic information and solutions to typical problems; and is intended to be used as a training tool and a reference source. The manual is divided into five categories. (1) "Basics…

  17. Route Maintenance in a Wireless Mobile Ad Hoc Shih-Lin Wu, Yu-Chee Tseng, Sze-Yao Ni, and Jang-Ping Sheu

    E-print Network

    Tseng, Yu-Chee

    Route Maintenance in a Wireless Mobile Ad Hoc Network Shih-Lin Wu, Yu-Chee Tseng, Sze-Yao Ni. In this paper, we consider the route maintenance problem, which includes two parts: route deterioration as proactive and reactive, depending on how they react to topology changes [12]. A host running a proactive

  18. A Decision Support System for Concrete Bridge Maintenance

    NASA Astrophysics Data System (ADS)

    Rashidi, Maria; Lemass, Brett; Gibson, Peter

    2010-05-01

    The maintenance of bridges as a key element in transportation infrastructure has become a major concern for asset managers and society due to increasing traffic volumes, deterioration of existing bridges and well-publicised bridge failures. A pivotal responsibility for asset managers in charge of bridge remediation is to identify the risks and assess the consequences of remediation programs to ensure that the decisions are transparent and lead to the lowest predicted losses in recognized constraint areas. The ranking of bridge remediation treatments can be quantitatively assessed using a weighted constraint approach to structure the otherwise ill-structured phases of problem definition, conceptualization and embodiment [1]. This Decision Support System helps asset managers in making the best decision with regards to financial limitations and other dominant constraints imposed upon the problem at hand. The risk management framework in this paper deals with the development of a quantitative intelligent decision support system for bridge maintenance which has the ability to provide a source for consistent decisions through selecting appropriate remediation treatments based upon cost, service life, product durability/sustainability, client preferences, legal and environmental constraints. Model verification and validation through industry case studies is ongoing.

  19. A Minimum (Delta)V Orbit Maintenance Strategy for Low-Altitude Missions Using Burn Parameter Optimization

    NASA Technical Reports Server (NTRS)

    Brown, Aaron J.

    2011-01-01

    Orbit maintenance is the series of burns performed during a mission to ensure the orbit satisfies mission constraints. Low-altitude missions often require non-trivial orbit maintenance (Delta)V due to sizable orbital perturbations and minimum altitude thresholds. A strategy is presented for minimizing this (Delta)V using impulsive burn parameter optimization. An initial estimate for the burn parameters is generated by considering a feasible solution to the orbit maintenance problem. An example demonstrates the dV savings from the feasible solution to the optimal solution.

  20. Beyond the Status Quo: Creating a School Maintenance Program.

    ERIC Educational Resources Information Center

    Chan, T. C.

    2000-01-01

    A well-planned maintenance program will prolong a new school building's life expectancy and save enormous sums. A maintenance program should include a facility inventory, a building archive, management of punch-list and warranty items, custodial service, proactive maintenance, a maintenance schedule, and energy conservation features. (MLH)

  1. Optimum preventative maintenance strategies using genetic algorithms and Bayesian updating

    Microsoft Academic Search

    E. A. Tantele; T. Onoufriou

    2009-01-01

    Preventative maintenance (PM) includes proactive maintenance actions that aim to prevent or delay a deterioration process that may lead to failure. This type of maintenance can be justified on economic grounds because it can extend the life of bridges and avoid the need for unplanned essential maintenance. Due to the high importance of the effective integration of PM measures in

  2. A Maintenance System Based on Near Field Communication

    Microsoft Academic Search

    Stephan Karpischek; Florian Michahelles; Albrecht Bereuter; Elgar Fleisch

    2009-01-01

    Maintenance of critical emergency infrastructure is potentially lifesaving, but also expensive and tedious to document and track. In this paper we demonstrate a maintenance system based on Near Field Communication (NFC). NFC-enabled mobile phones and NFC tags are used to improve recurring maintenance processes: the maintenance task itself becomes more efficient; and the system facilitates real-time documentation, central process control

  3. Maintenance Approaches For ARIES-CS Power Core

    E-print Network

    coils; - modular replacement through a small number of designated maintenance port using articulated of Fusion Energy September 14-16, 2004 Madison, WI #12;2 Outline Introduction Reactor parameters Maintenance approach based on field-period units Modular maintenance approach through selected ports Maintenance

  4. MEDEMAS Medical Device Management and Maintenance System Architecture

    Microsoft Academic Search

    Ülkü Balci Dogan; Mehmet Ugur Dogan; Yekta Ülgen; Mehmed Özkan

    2010-01-01

    In the proposed study, a medical device maintenance management system (MEDEMAS) is designed and implemented which provides a data pool of medical devices, the maintenance protocols and other required information for these devices. The system also contains complete repair and maintenance history of a specific device. MEDEMAS creates optimal maintenance schedule for devices and enables the service technician to carry

  5. A decision support maintenance management system : Development and implementation

    Microsoft Academic Search

    Oscar Fernandez; Ashraf W. Labib; Ralph Walmsley; David J. Petty

    2003-01-01

    Competitiveness has forced companies to improve the overall performance of the business. In the area of maintenance, much has been written about strategies, such as total productive maintenance or reliability centred maintenance, in order to increase the reliability and therefore capacity of the industrial plants in their quest for world-class maintenance. However, if a strategy is to be effective, it

  6. Optimal Maintenance Information System of Gezhouba Hydro Power Plant

    Microsoft Academic Search

    Zhaohui Li; Youzhong Ai; Huixuan Shi

    2007-01-01

    Maintenance is fundamental for the safe and stable operation of hydro power plants. And it's also the most cost intensive activity. Optimal maintenance is a reliability centered maintenance strategy with considering all facility condition, hydraulic resources and electricity market. HOMIS (optimal maintenance information system for hydro power plants) is an information platform to implement this strategy. HOMIS is vertically organized

  7. Maintenance Staffing Standards for Zero-Based Budgeting.

    ERIC Educational Resources Information Center

    Adams, Matthew C.; And Others

    1998-01-01

    Discusses school preventive maintenance and the variables associated with maintenance staffing standards that address a zero-based budgeting environment. Explores preventive-maintenance measurement for staffing requirements, defines staffing levels and job descriptions, and outlines the factors to consider when creating a maintenance program and…

  8. ENHANCEMENT, OPERATION, AND MAINTENANCE ACTIVITIES WILDLIFE MITIGATION PROJECTS

    E-print Network

    GUIDELINES for ENHANCEMENT, OPERATION, AND MAINTENANCE ACTIVITIES for WILDLIFE MITIGATION PROJECTS ....................................................................................... 16 III. OTHER ENHANCEMENT MEASURES

  9. Standardized Auditing and Surveillance of Aircraft Maintenance Operations

    Microsoft Academic Search

    Kunal Kapoor; Pallavi Dharwada; Nikhil Iyengar; Joel S. Greenstein; Anand K. Gramopadhye

    The safety and reliability of air transportation depends on minimizing inspection and maintenance errors that occur in the complex aircraft maintenance system. Significant efforts have been invested to investigate and track maintenance errors. However, these efforts are typically not preventative measures; rather they are reactive in nature: they focus on analyzing maintenance accidents and errors after their occurrence. There exists

  10. Optimal design of a condition-based maintenance model

    Microsoft Academic Search

    Suprasad V. Amari; Leland McLaughlin

    2004-01-01

    System performance and associated gain can be improved by using efficient maintenance policies. The latest developments in maintenance models include condition-based maintenance strategies. This paper presents a condition-based maintenance model for a deteriorating system. Deterioration can be defined as a process where the important parameters of a system gradually worsen, and if left unattended, the process leads to deterioration failure.

  11. Operations and maintenance report on Air Force oil/water separators. Final report, September 1985-August 1986

    SciTech Connect

    Kilroy, M.D.

    1986-10-01

    This report is intended to provide general guidance for the routine operation and maintenance of oil/water separators. The report should help managers and operators to recognize and correct problems affecting the separation process of oil and water. The most common types of gravity separators used by the Air Force are discussed. Other topics include operation guidelines, flow measurements, maintenance service, waste disposal and regulations, sampling and testing, recordkeeping and spill-prevention measures.

  12. Maintenance and Logistics Support for the International Monitoring System Network of the CTBTO

    NASA Astrophysics Data System (ADS)

    Haslinger, F.; Brely, N.; Akrawy, M.

    2007-05-01

    The global network of the International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), once completed, will consist of 321 monitoring facilities of four different technologies: hydroacoustic, seismic, infrasonic, and radionuclide. As of today, about 65% of the installations are completed and contribute data to the products issued by the International Data Centre (IDC) of the CTBTO. In order to accomplish the task to reliably collect evidence for any potential nuclear test explosion anywhere on the planet, all stations are required to perform to very high data availability requirements (at least 98% data availability over a 12-month period). To enable reaching this requirement, a three-layer concept has been developed to allow efficient support of the IMS stations: Operations, Maintenance and Logistics, and Engineering. Within this concept Maintenance and Logistics provide second level support of the stations, whereby problems arising at the station are assigned through the IMS ticket system to Maintenance if they cannot be resolved on the Operations level. Maintenance will then activate the required resources to appropriately address and ultimately resolve the problem. These resources may be equipment support contracts, other third party contracts, or the dispatch of a maintenance team. Engineering Support will be activated if the problem requires redesign of the station or after catastrophic failures when a total rebuild of a station may be necessary. In this model, Logistics Support is responsible for parts replenishment and support contract management. Logistics Support also collects and analyzes relevant failure mode and effect information, develops supportability models, and has the responsibility for document management, obsolescence, risk & quality, and configuration management, which are key elements for efficient station support. Maintenance Support in addition is responsible for maintenance strategies, for planning and oversight of the execution of preventive maintenance programs by the Station Operators, and for review of operational troubleshooting procedures used in first level support. Particular challenges for the efficient and successful Maintenance and Logistics Support of the IMS network lie in the specific political boundary conditions regulating its implementation, in the fact that all IMS facilities and their equipment are owned by the respective host countries, and in finding the appropriate balance between outsourcing services and retaining essential in-house expertise.

  13. The Effect of Line Maintenance Activity on Airline Safety Quality

    NASA Technical Reports Server (NTRS)

    Rhoades, Dawna L.; Reynolds, Rosemarie; Waguespack, Blaise, Jr.; Williams, Michael

    2005-01-01

    One of the arguments against deregulation of the airline industry has been the possibility that financially troubled carriers would be tempted to lower line maintenance spending, thus lowering maintenance quality and decreasing the overall safety of the carrier. Given the financial crisis triggered by the events of 9/11: it appears to be a good time to revisit this issue. This paper examines the quality of airline line maintenance activity and examines the impact of maintenance spending on maintenance quality and overall safety. Findings indicate that increased maintenance spending is associated with increased line maintenance activity and increased overall safety quality for the major U.S. carriers.

  14. Age-related maintenance versus reliability centred maintenance: a case study on aero-engines

    Microsoft Academic Search

    J. Crocker; U. D. Kumar

    2000-01-01

    Reliability Centred Maintenance (RCM) is a procedure carried out as part of the logistic support analysis (LSA) process and is described in the US Department of Defence Military Standards (Mil Std 2173). RCM allows logisticians the opportunity to determine the best maintenance policy for each component within a system. However, the only data that are available to carryout RCM using

  15. Discussion on maintenance strategy, policy and corresponding maintenance systems in manufacturing

    Microsoft Academic Search

    Shuo Wei Zeng

    1997-01-01

    This paper presents a case study on aintenance at robotic car assembly lines, and further gives a discussion on how to form an optimum maintenance strategy, policy and corresponding maintenance systems in order to achieve high reliability, availability, safety and productivity of manufacturing systems. It stresses that it is technically possible and economically necessary to maintain the manufacturing systems in

  16. Hayden Station power-plant maintenance system: preventive-maintenance program. First interim progress report

    SciTech Connect

    Not Available

    1983-10-24

    Progress is reported on the following objectives to: perform a benefit/cost evaluation of a preventive maintenance program designed to enhance the availability of a central station power plant and document the program at a level of detail which will assist other utilities in making a decision as to whether or not to implement a preventive maintenance program.

  17. AUTOMOTIVE DIESEL MAINTENANCE 1. UNIT XX, CUMMINS DIESEL ENGINE, MAINTENANCE SUMMARY.

    ERIC Educational Resources Information Center

    Minnesota State Dept. of Education, St. Paul. Div. of Vocational and Technical Education.

    THIS MODULE OF A 30-MODULE COURSE IS DESIGNED TO PROVIDE A SUMMARY OF THE REASONS AND PROCEDURES FOR DIESEL ENGINE MAINTENANCE. TOPICS ARE WHAT ENGINE BREAK-IN MEANS, ENGINE BREAK-IN, TORQUING BEARINGS (TEMPLATE METHOD), AND THE NEED FOR MAINTENANCE. THE MODULE CONSISTS OF A SELF-INSTRUCTIONAL BRANCH PROGRAMED TRAINING FILM "CUMMINS DIESEL ENGINE…

  18. 75 FR 4099 - Maintenance Wage Rate Wage Recommendation and Maintenance Wage Survey; Report of Additional...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-26

    ...or adopt prevailing wage rates for maintenance laborers and mechanics, and to approve or refer to the U.S. Department of Labor...or adopt prevailing wage rates for maintenance laborers and mechanics, and to approve or refer to the U.S. Department of...

  19. 75 FR 37457 - Maintenance Wage Rate Wage Recommendation and Maintenance Wage Survey; Report of Additional...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-29

    ...or adopt prevailing wage rates for maintenance laborers and mechanics, and to approve or refer to the U.S. Department of Labor...or adopt prevailing wage rates for maintenance laborers and mechanics, and to approve or refer to the U.S. Department of...

  20. List of Court Resolutions may 13.xls RESOLUTIONS

    E-print Network

    Glasgow, University of

    List of Court Resolutions may 13.xls RESOLUTIONS SUNDRY REGULATIONS CONTAINED IN RESOLUTIONS OFTEN Regulations Page 1 #12;List of Court Resolutions may 13.xls 56 13.10.70 Foundation of the Chair of Management

  1. Maintenance optimization of generating equipment based on a condition-based maintenance policy for multi-unit systems

    Microsoft Academic Search

    Ling Wang; Enhui Zheng; Yuntang Li; Binrui Wang; Jinjin Wu

    2009-01-01

    In a competitive market environment, privatized generating companies are pressured to more efficiently maintain their generating equipment in order to maximize their profit. As a result, condition based maintenance is becoming popular and highlighted by researchers and practitioners in power plants due to its advantages of improving maintenance efficiency and avoiding unnecessary maintenance. A new condition based and opportunistic maintenance

  2. Stochastic maintenance modelling of high-tech steel production plant

    Microsoft Academic Search

    A. H. Christer; W. Wang; J. M. Sharp; R. D. Baker

    \\u000a We describe a study of maintenance modelling in the steel industry. Following a detailed analysis of maintenance data, a stochastic\\u000a delay-time model of plant downtime was formulated. A study objective was to demonstrate the use of maintenance modelling in\\u000a showing the consequences to production of varying the interval of preventive maintenance and the quality of maintenance work\\u000a carried out. In

  3. Functional connectivity during working memory maintenance.

    PubMed

    Gazzaley, Adam; Rissman, Jesse; D'Esposito, Mark

    2004-12-01

    Neurophysiological experiments with monkeys have demonstrated that working memory (WM) is associated with persistent neural activity in multiple brain regions, such as the prefrontal cortex (PFC), the parietal cortex, and posterior unimodal association areas. WM maintenance is believed to require the coordination of these brain regions, which do not function in isolation but, rather, interact to maintain visual percepts that are no longer present in the environment. However, single-unit physiology studies and traditional univariate analyses of functional brain imaging data cannot evaluate interactions between distant brain regions, and so evidence of regional integration during WM maintenance is largely indirect. In this study, we utilized a recently developed multivariate analysis method that allows us to explore functional connectivity between brain regions during the distinct stages of a delayed face recognition task. To characterize the neural network mediating the on-line maintenance of faces, the fusiform face area (FFA) was defined as a seed and was then used to generate whole-brain correlation maps. A random effects analysis of the correlation data revealed a network of brain regions exhibiting significant correlations with the FFA seed during the WM delay period. This maintenance network included the dorsolateral and ventrolateral PFC, the premotor cortex, the intraparietal sulcus, the caudate nucleus, the thalamus, the hippocampus, and occipitotemporal regions. These findings support the notion that the coordinated functional interaction between nodes of a widely distributed network underlies the active maintenance of a perceptual representation. PMID:15849899

  4. Balance Problems

    MedlinePLUS

    ... often, it could be a sign of a balance problem. Balance problems can make you feel unsteady or as ... fall-related injuries, such as hip fracture. Some balance problems are due to problems in the inner ...

  5. Some optimization problems in power system reliability analysis 

    E-print Network

    Jirutitijaroen, Panida

    2009-05-15

    This dissertation aims to address two optimization problems involving power system reliabilty analysis, namely multi-area power system adequacy planning and transformer maintenance optimization. A new simulation method for power system reliability...

  6. Guidance for UMTRA project surveillance and maintenance

    SciTech Connect

    NONE

    1986-01-01

    The Guidance for UMTRA Project Surveillance and Maintenance describes the procedures that will be used to verify that Uranium Mill Tailings Remedial Action (UMTRA) Project disposal sites continue to function as designed. The approach of this guidance document is to identify surveillance requirements and maintenance procedures that will be used to comply with NRC license requirements. This document addresses five primary activities: Definition and characterization of final site conditions. Site inspections; Ground-water monitoring; Aerial photography; and Custodial maintenance and contingency repair. Final site conditions will be defined and characterized prior to the completion of remedial actions at a site. As-built drawings will be compiled, a final topographic survey will be performed, a vicinity map will be prepared, and ground and aerial photographs will be taken. Survey monuments, site markers, and signs will be established as will a network of monitoring wells.

  7. Current-oriented swimming by jellyfish and its role in bloom maintenance.

    PubMed

    Fossette, Sabrina; Gleiss, Adrian Christopher; Chalumeau, Julien; Bastian, Thomas; Armstrong, Claire Denise; Vandenabeele, Sylvie; Karpytchev, Mikhail; Hays, Graeme Clive

    2015-02-01

    Cross-flows (winds or currents) affect animal movements [1-3]. Animals can temporarily be carried off course or permanently carried away from their preferred habitat by drift depending on their own traveling speed in relation to that of the flow [1]. Animals able to only weakly fly or swim will be the most impacted (e.g., [4]). To circumvent this problem, animals must be able to detect the effects of flow on their movements and respond to it [1, 2]. Here, we show that a weakly swimming organism, the jellyfish Rhizostoma octopus, can orientate its movements with respect to currents and that this behavior is key to the maintenance of blooms and essential to reduce the probability of stranding. We combined in situ observations with first-time deployment of accelerometers on free-ranging jellyfish and simulated the behavior observed in wild jellyfish within a high-resolution hydrodynamic model. Our results show that jellyfish can actively swim countercurrent in response to current drift, leading to significant life-history benefits, i.e., increased chance of survival and facilitated bloom formation. Current-oriented swimming may be achieved by jellyfish either directly detecting current shear across their body surface [5] or indirectly assessing drift direction using other cues (e.g., magnetic, infrasound). Our coupled behavioral-hydrodynamic model provides new evidence that current-oriented swimming contributes to jellyfish being able to form aggregations of hundreds to millions of individuals for up to several months, which may have substantial ecosystem and socioeconomic consequences [6, 7]. It also contributes to improve predictions of jellyfish blooms' magnitude and movements in coastal waters. PMID:25619761

  8. Modified Noise Power Ratio testing of high resolution digitizers

    SciTech Connect

    McDonald, T.S.

    1994-05-01

    A broadband, full signal range, side-by-side (tandem) test method for estimating the internal noise performance of high resolution digitizers is described and illustrated. The technique involves a re-definition of the traditional Noise Power Ratio (NPR) test, a change that not only makes this test applicable to higher resolution systems than was previously practical, but also enhances its value and flexibility. Since coherence analysis is the basis of this new definition, and since the application of coherence procedures to high resolution data poses several problems, this report discusses these problems and their resolution.

  9. Dynamic kinetic resolution.

    PubMed

    Gihani, M T; Williams, J M

    1999-02-01

    The use of transition-metal-enzyme combinations to effect tandem in situ racemisation and resolutions has extended the scope of dynamic kinetic resolutions. This methodology has signalled a more proactive stance to the racemisation process, which has traditionally relied on more fortuitous approaches, namely the exploitation of labile substrates. The development and application of specific racemising enzymes such as mandelate racemase offers potential for future multienzyme dynamic kinetic resolutions. PMID:10021402

  10. Towards a Versatile Problem Diagnosis Infrastructure for Large Wireless Sensor Networks?

    Microsoft Academic Search

    Konrad Iwanicki; Maarten van Steen

    2007-01-01

    In this position paper, we address the issue of durable maintenance of a wireless sensor network, which will be crucial if the vision of large, long-lived sensornets is to become reality. Durable maintenance requires tools for diagnos- ing and fixing occurring problems, which can range from internode connectivity losses, to time synchronization problems, to software bugs. While there are so-

  11. ATLAS Maintenance and Operation management system

    E-print Network

    Copy, B

    2007-01-01

    The maintenance and operation of the ATLAS detector will involve thousands of contributors from 170 physics institutes. Planning and coordinating the action of ATLAS members, ensuring their expertise is properly leveraged and that no parts of the detector are understaffed or overstaffed will be a challenging task. The ATLAS Maintenance and Operation application (referred to as Operation Task Planner inside the ATLAS experiment) offers a fluent web based interface that combines the flexibility and comfort of a desktop application, intuitive data visualization and navigation techniques, with a lightweight service oriented architecture. We will review the application, its usage within the ATLAS experiment, its underlying design and implementation.

  12. Implant maintenance using a modified ultrasonic instrument.

    PubMed

    Kwan, J Y; Zablotsky, M H; Meffert, R M

    1990-01-01

    With the increasing number of implants in place, oral hygiene and maintenance are imperative because implants are susceptible to plaque accumulation and calculus formation. This case study evaluated a modification of the common ultrasonic tip to remove calcified deposits on implant abutments and prostheses, and also evaluated ultrastructural changes on polished titanium. A modified "plastic" ultrasonic instrument was found to be clinically effective and efficient. This instrument, unlike a metal ultrasonic tip on an ultrastructural level, produced no irreversible changes on the evaluated commercially pure titanium test strip. The preliminary results of this modification of an ultrasonic instrument show promise for its use as an implant maintenance modality. PMID:2098488

  13. Process redesign of production maintenance operations

    SciTech Connect

    Rankin, M.; Lowe, B.; Disney, V. Spilman, K.

    1995-12-31

    This paper describes a methodology for the systematic redesign of traditional production maintenance operations as they relate to subsurface failures of sucker rod pumped wells. The paper advocates an organized approach to process definition, refinement and redesign such that improvement objectives are clearly communicated, appropriate human and physical resources are brought to bear, and a system of improvement measurements becomes the overriding focus of the operation. Specific examples of the use of statistical process control tools in the production maintenance quality improvement effort are explored.

  14. Fundamentals High Resolution

    E-print Network

    Simons, Jack

    Fundamentals of High Resolution Pulse and Fourier Transform NMR Spectroscopy #12;#12;iii 1. ........................................................................................... 10 5. The Effects of Radio Frequency Fields

  15. CREW CHIEF: A computer graphics simulation of an aircraft maintenance technician

    NASA Technical Reports Server (NTRS)

    Aume, Nilss M.

    1990-01-01

    Approximately 35 percent of the lifetime cost of a military system is spent for maintenance. Excessive repair time is caused by not considering maintenance during design. Problems are usually discovered only after a mock-up has been constructed, when it is too late to make changes. CREW CHIEF will reduce the incidence of such problems by catching design defects in the early design stages. CREW CHIEF is a computer graphic human factors evaluation system interfaced to commercial computer aided design (CAD) systems. It creates a three dimensional man model, either male or female, large or small, with various types of clothing and in several postures. It can perform analyses for physical accessibility, strength capability with tools, visual access, and strength capability for manual materials handling. The designer would produce a drawing on his CAD system and introduce CREW CHIEF in it. CREW CHIEF's analyses would then indicate places where problems could be foreseen and corrected before the design is frozen.

  16. Image Super-Resolution Based on Sparsity Prior via Smoothed l0 Norm

    E-print Network

    Wang, Zhou

    Image Super-Resolution Based on Sparsity Prior via Smoothed l0 Norm Mohammad Rostami Department to tackle the problem of re- constructing a high-resolution image from a single low-resolution input image, known as single image super-resolution. In the literature, sparse representation has been used

  17. Intimate partner violence among individuals in methadone maintenance treatment

    PubMed Central

    de Dios, Marcel A.; Anderson, Bradley J.; Caviness, Celeste M.; Stein, Michael

    2013-01-01

    Background Intimate partner violence (IPV) is a highly prevalent and concerning problem among methadone maintenance populations, and previous studies have shown a relationship between a history of IPV and increased substance use and affective disturbances. Methods The current study examined 1) the association between recent IPV victimization and alcohol and cocaine use and 2) the relationship between recent IPV victimization and depression in a sample of smokers (n=203) in methadone maintenance treatment (MMT). Participants in this study completed a battery of assessments that included standard questionnaires of trauma, alcohol and substance use, and depression. Parallel logistic and linear regression models were used to estimate the adjusted association of IPV victimization and depressive symptoms and evaluate the adjusted association of victimization with recent substance use. Results Participants recently victimized by partners were shown to have significantly higher mean CES-D scores (b = 0.54, 95%CI 0.07; 1.02, p < .05) and were found to have a 6 times greater likelihood of cocaine use (OR = 6.65, 95%CI 1.61; 27.46, p < .01) after controlling for age, gender, education, opiate use and ethnicity. Conclusions These findings support the notion that IPV victimization can potentially increase depression and other substance use among MMT patients, which can have a deleterious impact on treatment. PMID:24821357

  18. The Role of Automatic Negative Reinforcement in Clinical Problems

    ERIC Educational Resources Information Center

    Miltenberger, Raymond G.

    2005-01-01

    This paper discusses the role of automatic negative reinforcement in the maintenance of clinical problems. Following a brief introduction to the functional conceptualization of clinical problems and discussion of four classes of reinforcement maintaining clinical problems, the paper suggests that automatic negative reinforcement is an understudied…

  19. The Possibility of Traditional Chinese Medicine as Maintenance Therapy for Advanced Nonsmall Cell Lung Cancer

    PubMed Central

    Xu, Weiru; Yang, Guowang; Xu, Yongmei; Zhang, Qing; Fu, Qi; Yu, Jie; Yu, Mingwei; Zhao, Wenshuo; Yang, Zhong; Hu, Fengshan; Han, Dong; Wang, Xiaomin

    2014-01-01

    Lung cancer has become the leading cause of cancer deaths, with nonsmall cell lung cancer (NSCLC) accounting for around 80% of lung cancer cases. Chemotherapy is the main conventional therapy for advanced NSCLC. However, the disease control achieved with classical chemotherapy in advanced NSCLC is usually restricted to only a few months. Thus, sustaining the therapeutic effect of first-line chemotherapy is an important problem that requires study. Maintenance therapy is given for patients with advanced NSCLC if three is no tumor progression after four to six cycles of first-line platinum-based chemotherapy. However, selection of appropriate maintenance therapy depends on several factors, while traditional Chinese medicine (TCM) as maintenance therapy is recommended for all kinds of patients. It has been demonstrated that TCM can prolong the survival time, improve the quality of life (QOL), and reduce the side effects for advanced NSCLC. Although the trials we searched about TCM serving as maintenance therapy is only 9 studies, the results indicate TCM can prolong the progression free survival (PFS) and improve the QOL. So it is possible for TCM to be as maintenance therapy for advanced NSCLC. More rigorous trials are required to further verify its efficacy. PMID:25165478

  20. Optimal Maintenance Works for the Aborshada Road in the Western Region of Libya

    NASA Astrophysics Data System (ADS)

    Youssef, Medhat Abdelrahman; Elbasher, Abdelbary Altayb

    2014-09-01

    In this research, the condition of a road pavement was investigated for the Aborshada Road in the Gharian region of Libya to determine the optimal maintenance works. Previously, a simple engineering judgment was the only procedure followed by the Gharian municipal engineers for evaluating pavements and prioritizing maintenance. The surface condition of the Aborshada Road pavement was investigated using "the Pavement Condition Index (PCI)" visual technique. The pavement was inspected to survey the different distresses in each sample unit. Ninteen pavement distresses were classified according to the PCI standards (PCI for roads and parking lots became an ASTM standard in 2007 (D6433-07)). It was necessary to know the most common distresses of the Aborshada Road to provide assistance for the decision maker in his evaluation of the pavement and the optimum repair method to be selected. This study reveals the actual performance of the pavements and suggests the research required for dealing with the pavement maintenance problem in Libya, especially in the western region. The best maintenance alternative for Aborshada Road was Case No. 3 (Potholes, Long. & Trans. Cracking and Alligator Crack Maintenance). Also, the most common pavement distresses on the Aborshada Road were Distress Nos. 1, 3, 6, 7, 10 and 13 according to the ASTM - D6433-07 classification

  1. PROACTIVE MAINTENANCE as a STRATEGIC BUSINESS ADVANTAGE

    Microsoft Academic Search

    Dale R. Blann

    For maintenance to make its proper contribution to profits, productivity, and quality, it must be recognized as an integral part of the plant production strategy -- an integral component of the overall plan by which the plant provides the product to the customer at the quality he wants at the price he wants to pay. Production, of course, is charged

  2. VRLA battery system reliability and proactive maintenance

    Microsoft Academic Search

    Xiyu Liu; Wei Wang

    2010-01-01

    Nowadays VRLA (valve regulated lead acid) battery is the main energy storage device selected for the telecommunication power supply system. Low maintenance is the primary advantage of VRLA battery over traditional VLA (vented or flooded lead acid) battery, while the main disadvantage is a somewhat shorter lifetime, Compared to the VLA battery. Further more, the actual service life is almost

  3. INFRASTRUCTURE AND MAINTENANCE OF WATER QUALITY

    EPA Science Inventory

    Concern over maintenance of water quality in distribution systems and a growing awareness of the apparent decay of America's infrastructure has motivated EPA's Drinking Water Research Division to sponsor a series of projects dealing with the repair and rehabilitation of drinking ...

  4. Telomere Protection and Maintenance in Arabidopsis thaliana 

    E-print Network

    Song, Xiangyu

    2011-08-08

    and characterization of STN1 (Suppressor of cdc thirteen, 1), CTC1 (Conserved Telomere maintenance Component 1) and TEN1 (Telomeric pathways in association with Stn1, 1) in Arabidopsis. CTC1/STN1/TEN1 (CST) forms a trimeric complex that specifically associates...

  5. Safety assured financial evaluation of maintenance 

    E-print Network

    Erguina, Vera

    2004-09-30

    of economic performance. The model is based on the general theory that the reliability of a plant at any time is a function of its initial reliability and the maintenance history of the individual plant components (Smith, 1997). Such a model can assist...

  6. Traceability for Maintenance of Secure Software Systems

    E-print Network

    Jurjens, Jan

    Traceability for Maintenance of Secure Software Systems 1 Yijun Yu 1 Jan Jurjens 2 John Mylopoulos for evolving software systems? #12;Outline of the talk · A traceability framework in support of software #12;Requirements for Traceability in ... · Requirements traceability is the ability to follow

  7. Language Maintenance Revisited: An Australian Perspective

    ERIC Educational Resources Information Center

    Cavallaro, Francesco

    2005-01-01

    Language maintenance has been an issue debated whenever languages come into contact. This paper presents a detailed discussion of the reasons most often cited as to why languages should be maintained, with a specific focus on Australia because of the country's multilingual makeup. Australia currently has about 150 aboriginal and Torres Strait…

  8. Naval Aviation Maintenance Office Information Strategy Plan

    Microsoft Academic Search

    P. J. Halsey; M. E. Busbee; L. M. Miller; J. W. Wills; S. D. Woods

    1990-01-01

    Data Systems Engineering Organization (DSEO) personnel, together with members of Naval Aviation Maintenance Office (NAMO), developed an Information Strategy Plan (ISP) using a combination of Information Engineering (IE) methodologies. The purpose of the ISP was to comprehensively and objectively analyze the information requirements of NAMO. The ISP activities began with structures interviews of the NAMO top level management to identify

  9. Generalized Training Devices for Avionic Systems Maintenance.

    ERIC Educational Resources Information Center

    Parker, Edward L.

    A research study was conducted to determine the feasibility and desirability of developing generalized training equipment for use in avionic systems maintenance training. The study consisted of a group of survey and analytic tasks to provide useful guidance to serve the needs of the Naval Aviation community in future years. The study had four…

  10. Migration Patterns and Language Maintenance in Paraguay.

    ERIC Educational Resources Information Center

    Gynan, Shaw N.

    1998-01-01

    Discusses migration patterns and language maintenance in Paraguay, where the majority of the population are speakers of Guarani, an indigenous South American language. Careful examination of Paraguayan census data reveals that Spanish-Guarani bilingualism is not nearly as widespread as claimed. (Author/VWL)

  11. Oral Health Behavior: Acquisition and Maintenance

    ERIC Educational Resources Information Center

    Ohler, Frank D.

    1976-01-01

    The author (1) presents data drawn from a fourteen-week program on oral health care involving second-grade students; (2) concludes that such a program is successful in promoting short-term behavioral change; and (3) stresses the need for periodic reinforcement and repetition to assure behavior maintenance over time. (MB)

  12. Maintenance of European nuclear power plants

    SciTech Connect

    Burke, R.W.; Schoenecke, P.L.

    1987-05-01

    European practice and attitude toward maintenance have been reviewed and discussed face-to-face. Important but sometimes subtle differences with the US situation appear. Among the more obvious differences is the more cooperative relationship between the industry and the government.

  13. A Systems Approach to Electronics Maintenance Training.

    ERIC Educational Resources Information Center

    Valverde, Horace H.

    An Air Force systems-oriented electronics maintenance course for weapon control was developed and evaluated. A behavioral description based upon a task analysis of actual job requirements was first prepared. Based on objectives derived from these behavioral descriptions an experimental 14-week training course was developed. A group of subjects…

  14. Industrial Maintenance. Ohio's Competency Analysis Profile.

    ERIC Educational Resources Information Center

    Ohio State Univ., Columbus. Vocational Instructional Materials Lab.

    Developed through a modified DACUM (Developing a Curriculum) process involving business, industry, labor, and community agency representatives in Ohio, this document is a comprehensive and verified employer competency profile for industrial maintenance occupations. The list contains units (with and without subunits), competencies, and competency…

  15. Safety and maintenance engineering: A compilation

    NASA Technical Reports Server (NTRS)

    1974-01-01

    A compilation is presented for the dissemination of information on technological developments which have potential utility outside the aerospace and nuclear communities. Safety of personnel engaged in the handling of hazardous materials and equipment, protection of equipment from fire, high wind, or careless handling by personnel, and techniques for the maintenance of operating equipment are reported.

  16. Knowledge Maintenance: The State of the Art

    E-print Network

    Menzies, Tim

    ? Knowledge maintenance (KM) of knowledge-based systems = Insight + reflect + change + preserve Insight and five main ways these are processed. This tutorial will review dozen of software systems that contribute University Drive, Fairmont, USA June 1, 1999 WP:b/9x/kmall/tutorial.tex What is KM

  17. Code Clone Analysis Environment for Software Maintenance

    Microsoft Academic Search

    Yoshiki Higo; Toshihiro Kamiya; Shinji Kusumoto; Katsuro Inoue

    Recently, code clone has been regarded as one of factors that make software maintenance more dicult. A code clone is a code fragment in a source code that is identical or similar to another. For example, if we modify a code fragment which has code clones, it is necessary to consider whether we have to modify each of its code

  18. Dveloppement et maintenance Identification des anomalies

    E-print Network

    Spino, Claude

    Développement et maintenance Identification des anomalies et correction (déverminage) Ajout de Déploiement et exploitation d'infrastructure et installation de serveurs Application de normes de sécurité aux systèmes Mise en place de procédures, d'outils et environnement de développement Développement d'outils d

  19. Small Engine Maintenance and Repair, Course Description.

    ERIC Educational Resources Information Center

    Hunt, Edward B.; Anderson, Floyd L.

    Prepared by an instructor and curriculum specialists, this course of study was designed to meet individual needs of the dropout and/or hard-core unemployed youth by providing skill training, related information, and supportive services knowledge in small engine maintenance and repair. Students enrolled in this course work independently on a…

  20. Chemical Fume Hood Maintenance, Repair and Certification

    E-print Network

    Jia, Songtao

    Chemical Fume Hood Maintenance, Repair and Certification Procedure: 6.03 Created: 6/20/2013 Version of chemical fume hoods (CFH) at Columbia University. This includes performance testing, reporting and users on status of hood repair. 3. CFH Users/Lab Staff a. For details see Chemical Fume Hoods Use

  1. PORTFOLIO OF POTENTIAL STRATEGIES IN AERONAUTIC MAINTENANCE

    SciTech Connect

    Rolet, S. [Structural Health Engineering department, EADS Innovation Works, Toulouse (France)

    2010-02-22

    EADS divisions aim more and more at developing services associated to their platforms. EADS divisions, like Airbus and Eurocopter, are investigating on services associated to their platforms in order to add them value. One possible service consists in structural maintenance operation assistance, especially for NDT operations performed by the customer. EADS Innovation Works envisages three different and complementary enhanced structural maintenance categories. Enhanced NDT improves standard NDT operation environment. This is made possible by the existence of 'smart' NDT tools that are computer based and therefore able to support other functions. These functions range from local smart data processing and display to remote expert assisted operation. Passive Sensor Network relies on sensors permanently installed on aircraft structure. Interrogation of sensors is performed on ground and off line (while structure is not loaded except by its own weight). It can be done at arbitrary times in order to determine structure health. The aim is to give easy access to some hidden ''hot spots,'' to reduce human factor in structure health assessment and optimize maintenance. Structural Health Monitoring goes a step beyond Passive Sensor Network, because interrogation units are on board the aircraft and may be connected to aircraft network. It allows to use on-line techniques such as adapted acoustic emission and to automatically raise an alarm when a defect appears in the structure. This paper presents these different ways of improving structural maintenance operations in service, with their respective advantages and limitations.

  2. Computer Technology and Maintenance Curriculum. Final Report.

    ERIC Educational Resources Information Center

    Manchester Community Coll., CT.

    A project was conducted by Manchester Community College and Howell Cheney Vocational Technical School in Connecticut to develop a joint curriculum for a two-year computer technology and maintenance program. During the year the project was conducted, a high technology advisory council was formed, consisting of industry and faculty representatives…

  3. Business Machine Maintenance. Performance Objectives. Intermediate Course.

    ERIC Educational Resources Information Center

    McMinn, Robert

    Several intermediate performance objectives and corresponding criterion measures are listed for each of 28 terminal objectives presented in this guide for an intermediate business machine maintenance course at the secondary level. (For the basic course guide see CE 010 949.) Titles of the 28 terminal objective sections are Career Opportunities,…

  4. School Plant Maintenance and Custodial Services

    ERIC Educational Resources Information Center

    Kentucky State Dept. of Education, Frankfort.

    School maintenance guidelines are directed to the local school situation where the custodian may have neither the opportunity for any formal training or experienced personnel available to instruct him. Topics covered are those that are thought to be of greatest value to the local school custodian and include--(1) floor care, (2) carpet cleaning,…

  5. Seventh Annual Maintenance & Operations Cost Study

    ERIC Educational Resources Information Center

    Abramson, Paul

    1978-01-01

    Despite continually rising costs of fuel and other utilities, the cost of maintenance and operations in public school districts is not rising as quickly as the general cost of education. A state-by-state cost comparison is included. (Author/MLF)

  6. Fault tree analysis for maintenance needs

    Microsoft Academic Search

    Jari Halme; Antti Aikala

    2012-01-01

    One of the key issues in maintenance is to allocate focus and resources to those components and subsystems which are the most unreliable and prone to failures. In industrial systems, fault tree analysis technique can be used to study the reliability of the complex systems and their substructures. In this paper a fault tree application for analyzing online the current

  7. Modular Integrated Video System (MIVS) maintenance manual

    SciTech Connect

    Schneider, S.L.

    1990-03-01

    To assist in the repair of the Modular Integrated Video System (MIVS) printed circuit boards, a maintenance or service manual is essential. This manual provides a simplified overview of each PC board and explains the functions of each component. Setup procedures and parts lists for each board are included to minimize the task of aligning the boards and identifying replacement parts.

  8. DIPLOMARBEIT Fault Injection for Diagnosis and Maintenance

    E-print Network

    view over the system, and analysis in order to assess the health state of the system. A fault injection- ficient for meaningful statistical analysis. An embedded application synchronizes the fault injectionDIPLOMARBEIT Fault Injection for Diagnosis and Maintenance in the Time-Triggered Architecture

  9. Perceived Autonomy Support, Friendship Maintenance, and Happiness

    Microsoft Academic Search

    Melik?ah Demir; Metin Özdemir; Kendra Patrice Marum

    2011-01-01

    Decades of empirical research have shown that perceived autonomy support in close relationships is an essential correlate of happiness. However, what might account for the relationship between the 2? For this article, 4 studies (total N = 1325) investigated friendship maintenance as a mediator of the association between friendship autonomy support and happiness. The first 3 studies supported the model

  10. Criterion3: MAINTENANCE OF FOREST ECOSYSTEM

    E-print Network

    (Montréal Process Working Group 2010); Northern Area Forest Sustainability Indicators 7.1-7.4 (USDA FS 2010d capability for resiliency--producing uncharacteristic changes in forest health and associated processesCriterion3: MAINTENANCE OF FOREST ECOSYSTEM HEALTH AND VITALITY Montréal Process Criterion 3

  11. Development of a robotic bridge maintenance system

    Microsoft Academic Search

    Steven J Lorenc; Brian E Handlon; Leonhard E Bernold

    2000-01-01

    This paper will expand on the Robotic Bridge Maintenance System (RBMS) developed by the Construction Automation and Robotics Laboratory (CARL) at North Carolina State University (NCSU). The system consists of a 4-dof robot, designed and built at NCSU, mounted on the end of a truck-mounted peeper crane. Additionally, a containment system is mounted in front of the robot to contain

  12. Davis PV plant operation and maintenance manual

    SciTech Connect

    NONE

    1994-09-01

    This operation and maintenance manual contains the information necessary to run the Photovoltaics for Utility Scale Applications (PVUSA) test facility in Davis, California. References to more specific information available in drawings, data sheets, files, or vendor manuals are included. The PVUSA is a national cooperative research and demonstration program formed in 1987 to assess the potential of utility scale photovoltaic systems.

  13. 49 CFR 193.2639 - Maintenance records.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Each operator shall keep a record at each LNG plant of the date and type of each maintenance...the requirements of this part. For each LNG facility that is designed and constructed...records must be retained for as long as the LNG facility remains in service: (1)...

  14. Maintenance Guide for Microirrigation Systems in the

    E-print Network

    Maintenance Guide for Microirrigation Systems in the Southern Region By The Irrigation Water State Univ. Bryan Smith, Clemson Univ. Sam Dennis, Tennessee State Univ. of the Southern Regional Water UNIVERSITY UNIVERSITY OF TENNESSEE TENNESSEE STATE UNIVERSITY TEXAS A&M UNIVERSITY PRAIRIE VIEW A

  15. Identity maintenance and cognitive test performance

    Microsoft Academic Search

    Reef Youngreen; Bridget Conlon; Dawn T. Robinson; Michael J. Lovaglia

    2009-01-01

    Identity maintenance processes can affect performance when that performance is relevant to an important self-identity, including performance on standardized tests of mental ability. Affect control theory proposes that individuals’ performances are motivated to maintain concordance between fundamental sentiments about identities and contextually driven transient meanings. An experimental test used the college major identity and randomly assigned participants to different instruction

  16. UNCERTAINTY ASSESSMENT OF AIRCRAFT MAINTENANCE TIMES

    Microsoft Academic Search

    Hüseyin KUDAK; Sami ERCAN

    2009-01-01

    This thesis demonstrates the use of the Dempster-Shafer Theory of evidence as a decision aid to specify maintenance time during wartime operations, by the help of expert judgment elicitation. This more precise time estimation enables the decision maker to make more accurate decisions for Air Force's wartime tactical operations allowing commanders to gain a decisive advantage. The major failures were

  17. Project Surveillance and Maintenance Plan. [UMTRA Project

    SciTech Connect

    Not Available

    1985-09-01

    The Project Surveillance and Maintenance Plan (PSMP) describes the procedures that will be used by the US Department of Energy (DOE), or other agency as designated by the President to verify that inactive uranium tailings disposal facilities remain in compliance with licensing requirements and US Environmental Protection Agency (EPA) standards for remedial actions. The PSMP will be used as a guide for the development of individual Site Surveillance and Maintenance Plans (part of a license application) for each of the UMTRA Project sites. The PSMP is not intended to provide minimum requirements but rather to provide guidance in the selection of surveillance measures. For example, the plan acknowledges that ground-water monitoring may or may not be required and provides the (guidance) to make this decision. The Site Surveillance and Maintenance Plans (SSMPs) will form the basis for the licensing of the long-term surveillance and maintenance of each UMTRA Project site by the NRC. Therefore, the PSMP is a key milestone in the licensing process of all UMTRA Project sites. The Project Licensing Plan (DOE, 1984a) describes the licensing process. 11 refs., 22 figs., 8 tabs.

  18. A process for risk-focused maintenance

    SciTech Connect

    Lofgren, E.V.; Cooper, S.E.; Kurth, R.E.; Phillips, L.B. (Science Applications International Corp., McLean, VA (USA))

    1991-03-01

    This report presents a process for focusing maintenance resources on components that enable nuclear plant systems to perform their essential functions and on components whose failure may initiate challenges to safety systems, so as to have the greatest impact in decreasing risk. The process provides criteria, based on risk, for deciding which components are critical to risk and determining what maintenance activities are required to ensure reliable operation of those risk-critical components. Two approaches are provided for selection of risk-critical components. One approach uses the results of a Probabilistic Risk Assessment (PRA); the other is based on the methodology developed for this report, which has a basis in PRA although it does not use the results of a PRA study. Following identification of risk-critical components, both approaches use a single methodology for determining what maintenance activities are required to ensure reliable operation of the identified components. The report also provides demonstrations of application of the two approaches to selection of risk-critical components and demonstrations of application of the methodology for determining what maintenance activities are required to an active standby safety system, a normally operating system, and passive components. 5 refs., 11 figs., 1 tab.

  19. Stabilization Pond Operation and Maintenance Manual.

    ERIC Educational Resources Information Center

    Sexauer, Willard N.; Karn, Roger V.

    This manual provides the waste stabilization pond operator with the basics necessary for the treatment of wastewater in stabilization ponds. The material is organized as a comprehensive guide that follows the normal operation and maintenance procedures from the time the wastewater enters the left station until it leaves the pond. A comprehensive…

  20. Industrial Maintenance Technology. Technical Committee Report.

    ERIC Educational Resources Information Center

    Idaho State Dept. of Education, Boise. Div. of Vocational Education.

    This Technical Committee Report prepared by industry representatives in Idaho lists the skills currently necessary for an employee in that state to obtain a job in industrial maintenance technology, retain a job once hired, and advance in that occupational field. (Task lists are grouped according to duty areas generally used in industry settings,…