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Multi-skill Project Scheduling Problem and Total Productive Maintenance  

Microsoft Academic Search

In this paper, we propose a multi-skill project scheduling problem model for maintenance activities organization. Preventive maintenance activities are usually planned in advance: production is stopped and all maintenance activities should be processed as fast as possible in order to restart production. Moreover, these human resource handled activities require specific skills and are subject to precedence constraints. The main difference

Cedric Pessan


Ground-water problems in highway construction and maintenance  

USGS Publications Warehouse

This report discusses the occurrence of ground water in relation to certain problems in highway construction and maintenance. These problems are: the subdrainage of roads; quicksand; the arrest of soil creep in road cuts; the construction of lower and larger culverts necessitated by the farm-drainage program; the prevention of failure of bridge abutments and retaining walls; and the water-cement ratio of sub-water-table concrete. Although the highway problems and suggested solutions are of general interest, they are considered with special reference to the State of Delaware, in relation to the geology of that State. The new technique of soil stabilization by electroosmosis is reviewed in the hope that it might find application here in road work and pile setting, field application by the Germans and Russians is reviewed.

Rasmussen, W. C.; Haigler, L. B.



Maintenance of Materialized Views: Problems, Techniques, and Applications  

Microsoft Academic Search

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

Ashish Gupta; Inderpal Singh Mumick



A Survey of Road Construction and Maintenance Problems in Central Alaska.  

National Technical Information Service (NTIS)

A survey of road construction and maintenance problems in central Alaska is presented. The problems of poor fill and foundation material, permafrost degradation under pavement and shoulders, slope instability, water erosion, road icing from subsurface see...

E. F. Clark O. W. Simoni




EPA Science Inventory

The use of environmental isotopes as tracers in the hydrosphere is increasing as analytical instrumentation improves and more applications are discovered. There exists still misconceptions on the role of isotopes in resolving hydrology problems. Naturally occurring isotopes in th...


Predictors of children's sleep onset and maintenance problems after road traffic accidents  

PubMed Central

Background Sleep onset and maintenance problems are a frequent complaint after traumatic events in children. However, the association of traumatic experiences and disturbed sleep remains to be explained. Objective To examine the incidence of sleep onset and maintenance problems in children after road traffic accidents and identify potential predictors of sleep onset and maintenance problems, including putative psychopathological mechanisms as well as stressors affecting the family system. Method In 33 children treated for injuries after road traffic accidents, sleep and measures of psychopathology were assessed 10 days, 2 months, and 6 months after hospital admission. The predictive value of four clusters of predictor variables for children's sleep onset and maintenance problems was prospectively tested by multiple regression analyses. These clusters included socio-demographic, injury- and accident-related, and psychopathological variable clusters as well as factors reflecting stressors concerning mothers and family. Results Children suffering from posttraumatic stress reported a prolonged subjective sleep latency. The severity of sleep onset and maintenance problems was predicted by female sex and the child's as well as mothers’ posttraumatic stress disorder (PTSD) severity. Conclusions Sleep onset and maintenance problems in children after trauma appear to result from a complex interaction of multiple factors. Our findings support the transactional model of sleep-wake regulation that bears implications for the development of adequate intervention strategies.

Wittmann, Lutz; Zehnder, Daniel; Jenni, Oskar G.; Landolt, Markus A.



Internet-Based Recording Service Solves Maintenance Reporting Problems.  

ERIC Educational Resources Information Center

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)

Noah, Marilyn



Pediatric Enteric Feeding Techniques: Insertion, Maintenance, and Management of Problems  

SciTech Connect

Enteral feeding is considered a widespread, well-accepted means of delivering nutrition to adults and children who are unable to consume food by mouth or who need support in maintaining adequate nutrition for a variety of reasons, including acute and chronic disease states. Delivery of enteral feeding to nutritionally deprived patients may be achieved by several means. In this article, the indications and insertion of enteral access in children will be reviewed. In addition, common complications and management of problems will be discussed.

Nijs, Els L. F., E-mail: nijs@email.chop.ed [University of Pennsylvania, Department of Clinical Radiology, Children's Hospital of Philadelphia (United States); Cahill, Anne Marie, E-mail: cahill@email.chop.ed [University of Pennsylvania, Department of Radiology, Children's Hospital of Philadelphia (United States)



The speed assignment problem for conflict resolution in aerial robotics  

Microsoft Academic Search

This paper presents an efficient conflict resolution method for multiple aerial vehicles based on speed planning. The problem is assigning a speed profile to each aerial vehicle in real time such that the separation between them is greater than a minimum safety value and the total deviation from the initial planned trajectories is minimized. Also, the arrival time of each

D. Alejo; J. A. Cobano; M. A. Trujillo; A. Viguria; A. Rodriguez; A. Ollero



Optimization as a Tool for Consistency Maintenance in Multi-Resolution Simulation  

NASA Technical Reports Server (NTRS)

The need for new approaches to the consistent simulation of related phenomena at multiple levels of resolution is great. While many fields of application would benefit from a complete and approachable solution to this problem, such solutions have proven extremely difficult. We present a multi-resolution simulation methodology that uses numerical optimization as a tool for maintaining external consistency between models of the same phenomena operating at different levels of temporal and/or spatial resolution. Our approach follows from previous work in the disparate fields of inverse modeling and spacetime constraint-based animation. As a case study, our methodology is applied to two environmental models of forest canopy processes that make overlapping predictions under unique sets of operating assumptions, and which execute at different temporal resolutions. Experimental results are presented and future directions are addressed.

Drewry, Darren T; Reynolds, Jr , Paul F; Emanuel, William R



Theoretical Problems in High Resolution Solar Physics, 2  

NASA Technical Reports Server (NTRS)

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.

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




NASA Astrophysics Data System (ADS)

It is widely acknowledged that roads are the most important transport infrastructure in developing countries. Unlike railroads requiring organizations and systems to operate, individuals can drive on roads. Almost all donors have assisted developing countr ies for new road constructions and rehabilitations. Report of insufficient maintenance in the developing countries, however, has been notable. As a result of the maintenance problems, deterioration of roads is pr ogressing with speed more than expected. It causes the traffic safety problems and an obstacle of economic development. JICA and other donors recognize that this situation can not be overlooked and reci pient countries are increasing their expectation of obtaining assistance on road/bridge maintenance. JICA has implemented over 10 technical cooper ation projects for road/b ridge maintenance in developing countries. JICA conducted a study to review those projects comprehensively. That study aims at obtaining problems, lessons learned and discussion material for policy making and method improvement for future similar pr ojects. This report introduces the outline of the study including additional analysis and recommendations by the authors.

Nishimiya, Noriaki; Sanui, Kazumasa; Mizota, Yuzo


Bi-objective optimization algorithms for joint production and maintenance scheduling: application to the parallel machine problem  

Microsoft Academic Search

This paper deals with the joint production and maintenance scheduling problem according to a new bi-objective approach. This\\u000a method allows the decision maker to find compromise solutions between the production objectives and maintenance ones. Reliability\\u000a models are used to take into account the maintenance aspect of the problem. The aim is to simultaneously optimize two criteria:\\u000a the minimization of the

A. Berrichi; L. Amodeo; F. Yalaoui; E. Châtelet; M. Mezghiche



A resolution of the ascertainment sampling problem. III. Pedigrees.  

PubMed Central

When nuclear families are sampled by an ascertainment procedure whose properties are not known, biased estimates of genetic parameters will arise if an incorrect specification of the ascertainment procedure is made. Elsewhere we have put forward a resolution of this problem by introducing an ascertainment-assumption-free (AAF) method, for nuclear family data, which gives asymptotically unbiased estimators no matter what the true nature of the ascertainment process. In the present paper we extend this method to cover pedigree data. Problems that arise with pedigrees but not with families--for example, the question of which families in a pedigree are "ascertainable"--are also considered. Comparisons of numerical results for pedigrees and nuclear families are also made.

Shute, N C; Ewens, W J



A resource conflict resolution problem formulated in continuous time  

NASA Astrophysics Data System (ADS)

In many situations involving data transmission from diverse sources there can be conflict for a limited number of channels or other facilities. Uncoordinated attempts by several sources to use a single facility can result in collision, the destruction of all participants in the collision, meaning the loss of the transmission, and hence the need for re-transmission. An important problem concerns the development of workable procedures for alleviating the conflict and corresponding message delay problems. Often such problems are viewed as occurring in discrete time: slots of equal length occur in temporal succession, and each slot can handle just one packet of data at a time, if two or more packets try to use the same slot simultaneously, a collision occurs that somehow must be resolved. A recent paper analyzed a stack protocol for handling such a situation, but there are many other proposals. This report is concerned with some simple models for a single facility (channel), and for contention or conflict resolution. The models are formulated in a continuous-time manner: messages, or numbers of packets constituting messages, are long, meaning that they occupy many consecutive slots on the average if a single transmission is occurring.

Gaver, D. P.; Fayolle, G.; Weiss, A.



NASA Engineering and Safety Center NDE Super Problem Resolution Team  

NASA Astrophysics Data System (ADS)

The NASA Engineering and Safety Center (NESC) is an independent organization, which was charted in the wake of the Space Shuttle Columbia accident to serve as an Agency-wide technical resource focused on engineering excellence. The objective of the NESC is to improve safety by performing in-depth independent engineering assessments, testing, and analysis to uncover technical vulnerabilities and to determine appropriate preventative and corrective actions for problems, trends or issues within NASA's programs, projects and institutions. Critical to the NESC are teams of experts in a number of core disciplines including nondestructive evaluation (NDE). These teams, designated Super Problem Resolution Teams (SPRTs), draw upon the best engineering expertise from across the Agency and include partnerships with other government agencies, national laboratories, universities and industry. The NESC NDE SPRT provides a ready resource of NDE technical expertise to support NESC Independent Technical Assessments and Investigations. The purpose of this session will be to provide an overview of the NESC and the NDE SPRT along with a few examples of NDE related problems that the team has addressed for NASA Programs. It is hoped that this session will be of interest to the general NDE community and will foster contacts with additional NDE experts that might provide future support to the NASA NESC NDE SPRT.

Prosser, W. H.



Use of the Decision Support Problem Technique for Propulsion Engine Selection Emphasizing Reliability, Maintenance, and Repair Factors: A Limited Example.  

National Technical Information Service (NTIS)

A Decision Support Problem Technique (DSPT) is used for the selection of a slow speed diesel engine for the propulsion of a proposed commercial cargo vessel satisfying strategic sealift requirements, and emphasizing reliability, maintenance, and repair fa...

K. Lynaugh E. Pogue B. Friedman



Hybrid Particle Swarm Optimization for Hybrid Flowshop Scheduling Problem with Maintenance Activities  

PubMed Central

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.

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



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


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

Li, Jun-Qing; Pan, Quan-Ke; Mao, Kun



Resolution of the U(1) Problem by Lattice Gauge Theory,  

National Technical Information Service (NTIS)

The U(1) problem is a longstanding problem and the main motivation to study topological properties of SU(3) lattice gauge theory. In the seminar the author quickly reviews the U(1) problem and points out the first indications towards the solution of it. T...

J. Hoek



Automatic resolution of the three-points geological problem  

NASA Astrophysics Data System (ADS)

The problem of three points, or 3P problem, is the basic geometrical reference of numerous geological structures. We propose a simple Microsoft Excel spreadsheet program that determines from three georeferenced points the strike and dip of the plane that contains them. Practical examples showing the application in Google Earth and LIDAR data are presented.

Martinez-Torres, Luis M.; Lopetegui, Ane; Eguiluz, Luis



Safeguards Problems During Large-Scale Maintenance Work at Nuclear Power Plants with Pressurised-Water Reactors.  

National Technical Information Service (NTIS)

Using the Rheinsberg NPP as an example, a description is given of specific safeguards problems associated with large-scale maintenance work on pressurised-water reactors of the WWER type. They are due to increased radiation level in the reactor hall, long...

M. Burmester K. Rudolf G. Hoefs



High-resolution structure prediction and the crystallographic phase problem  

Microsoft Academic Search

The energy-based refinement of low-resolution protein structure models to atomic-level accuracy is a major challenge for computational structural biology. Here we describe a new approach to refining protein structure models that focuses sampling in regions most likely to contain errors while allowing the whole structure to relax in a physically realistic all-atom force field. In applications to models produced using

Bin Qian; Srivatsan Raman; Rhiju Das; Philip Bradley; Airlie J. McCoy; Randy J. Read; David Baker



Baldwin's Two Developmental Resolutions of the Mind-Body Problem.  

ERIC Educational Resources Information Center

Pursues William Kessen's analysis of psychologist Baldwin's 1905 paper by examining Baldwin's two proposed solutions to the mind-body problem: the materialist solution and the idealist solution. Demonstrates that Baldwin's ideas presaged those of developmental theorists and philosophers. Discusses Baldwin's proposal that current scientific ideas…

Ferrari, Michel



Resolution of the magnetic moment problem in relativistic theories  

NASA Astrophysics Data System (ADS)

A Landau-Migdal approach to relativistic mean field theory of nuclear matter is used to define the single particle isoscalar current. By virtue of the near cancellation of scalar and vector potentials, this current is very close to the standard nonrelativistic isoscalar current; and hence the single particle isoscalar magnetic moment operator gives results in agreement with the nonrelativistic shell model. Calculations of magnetic moments for closed shell plus (or minus) one nucleon using this effective current operator recover the Schmidt values, thus resolving a longstanding problem with relativistic models of nuclear structure.

McNeil, J. A.; Amado, R. D.; Horowitz, C. J.; Oka, M.; Shepard, J. R.; Sparrow, D. A.



High Resolution Doppler Imager FY 2001,2002,2003 Operations and Algorithm Maintenance  

NASA Technical Reports Server (NTRS)

During the performance period of this grant HRDI (High Resolution Doppler Imager) operations remained nominal. The instrument has suffered no loss of scientific capability and operates whenever sufficient power is available. Generally, there are approximately 5-7 days per month when the power level is too low to permit observations. The daily latitude coverage for HRDI measurements in the mesosphere, lower thermosphere (MLT) region are shown.It shows that during the time of this grant, HRDI operations collected data at a rate comparable to that achieved during the UARS (Upper Atmosphere Research Satellite) prime mission (1991 -1995). Data collection emphasized MLT wind to support the validation efforts of the TIDI instrument on TIMED, therefore fulfilling one of the primary objectives of this phase of the UARS mission. Skinner et al., (2003) present a summary of the instrument performance during this period.

Skinner, Wilbert



Study of the inverse problem resolution quality: application to low-field magnetostatic  

Microsoft Academic Search

Purpose – This paper presents a method to improve inverse problem resolution. This method focuses on the measurement set and particularly on sensor position. Based on experiment, it aims at finding sensor position criteria to insure the least bad inverse problem solving. Design\\/methodology\\/approach – The studied device is a magnetized steel sheet measured by four sensors. Three optimization techniques are

Sébastien Guerin; Jean-Louis Coulomb; Gilles Cauffet



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

SciTech Connect

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.




The synaptic maintenance problem: membrane recycling, Ca2+ homeostasis and late onset degeneration  

PubMed Central

Most neurons are born with the potential to live for the entire lifespan of the organism. In addition, neurons are highly polarized cells with often long axons, extensively branched dendritic trees and many synaptic contacts. Longevity together with morphological complexity results in a formidable challenge to maintain synapses healthy and functional. This challenge is often evoked to explain adult-onset degeneration in numerous neurodegenerative disorders that result from otherwise divergent causes. However, comparably little is known about the basic cell biological mechanisms that keep normal synapses alive and functional in the first place. How the basic maintenance mechanisms are related to slow adult-onset degeneration in different diseasesis largely unclear. In this review we focus on two basic and interconnected cell biological mechanisms that are required for synaptic maintenance: endomembrane recycling and calcium (Ca2+) homeostasis. We propose that subtle defects in these homeostatic processes can lead to late onset synaptic degeneration. Moreover, the same basic mechanisms are hijacked, impaired or overstimulated in numerous neurodegenerative disorders. Understanding the pathogenesis of these disorders requires an understanding of both the initial cause of the disease and the on-going changes in basic maintenance mechanisms. Here we discuss the mechanisms that keep synapses functional over long periods of time with the emphasis on their role in slow adult-onset neurodegeneration.



The Effects of Child Behavior Problems on the Maintenance of Intervention Fidelity.  

ERIC Educational Resources Information Center

Investigates the effects of child behavior problems on teachers' (N=3) intervention fidelity across two intervention protocols: escape extinction and functional communication training. Results indicate that a high rate of behavior problems during escape extinction appeared to punish teachers' efforts. A low rate of behavior problems was evident…

McConnachie, Gene; Carr, Edward G.



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


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

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



A problem of Kollar and Larsen on finite linear groups and crepant resolutions  

Microsoft Academic Search

The notion of age of elements of complex linear groups was introduced by M. Reid and is of importance in algebraic geometry, in particular in the study of crepant resolutions and of quotients of Calabi-Yau varieties. In this paper, we solve a problem raised by J. Kollar and M. Larsen on the structure of finite irreducible linear groups generated by

Robert Guralnick; Pham Huu Tiep



Minisuperspace model of Machian resolution of Problem of Time. I. Isotropic case  

NASA Astrophysics Data System (ADS)

A local resolution to the Problem of Time that is Machian and was previously demonstrated for relational mechanics models is here shown to work for a more widely studied quantum cosmological model. I.e., closed isotropic minisuperspace GR with minimally coupled scalar field matter. This resolution uses work firstly along the lines of Barbour's at the classical level. Secondly, it uses a Machianized version of the semiclassical approach to quantum cosmology (the resolution given is not more than semiclassical). Finally, it uses a Machianized version of a combined semiclassical histories timeless records scheme along the lines of Halliwell's work. This program's goal is the treatment of inhomogeneous perturbations about the present paper's model. This draws both from this paper's minisuperspace work and from qualitative parallels with relational particle mechanics, since both have nontrivial notions of inhomogeneity/structure (clumping) as well as nontrivial linear constraints.

Anderson, Edward



High Order And High Resolution Methods For a Model CAA Problem  

NASA Technical Reports Server (NTRS)

The initial value problem for the first order linear wave equation in one space dimension is treated for two cases with specified initial data and grid, and data from solutions at t = 400 and t = 800 are presented, as prescribed for Problem 1 in Category 1. Results are shown from computations with a sequence of recently developed high order and high resolution methods which combine Hermite interpolation, Cauchy-Kowaleskya recursion for time derivatives, and Taylor series time advancement. These methods have the same order of accuracy in time as in space. Results are shown from methods that range from third to nineteenth order. The stated problems with the prescribed coarse grid can be simulated with errors that are at the level of machine accuracy if the method is sufficiently high order. In addition, the growth of the maximum absolute error out to t = 100,000 is given for simulations with the stated problem data.

Goodrich, John W.



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

NASA Technical Reports Server (NTRS)

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.

Keys, Denney J.



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

Microsoft Academic Search

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,

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



Social Environmental Influences on the Development and Resolution of Alcohol Problems  

PubMed Central

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.

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



An optimal production lot-sizing problem for an imperfect process with imperfect maintenance and inspection time length  

Microsoft Academic Search

This article develops an integrated model in considering the situations of an imperfect process with imperfect maintenance and inspection time for the joint determination of both economic production quantity (EPQ) and preventive maintenance (PM). This imperfect process has a general deterioration distribution with increasing hazard rate. Even with periodic PM, such a production system cannot be recovered as good as

Pe-Cheng Wang; Ya-Hui Lin; Yan-Chun Chen; Jen-Ming Chen



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

USGS Publications Warehouse

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.

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



Regular methods of solution of ill-posed problems for remote sensing of Earth atmosphere using high-resolution spectrometry  

Microsoft Academic Search

General regular methods of solution of ill-posed inverse problems and their application to geophysical sounding of Earth interior were developing during long time at Institute of Mathematics and Mechanics of Ural Branch of RAS. In this paper we apply the developed regular methods of solution of the inverse problems for retrieval of vertical temperature profiles from high-resolution thermal emission spectra

V. V. Vasin; K. G. Gribanov; V. I. Zakharov; E. N. Akimova; G. Ya. Perestoronina; L. Yu. Timerkhanova



Cryogenics maintenance strategy  

NASA Astrophysics Data System (ADS)

ALMA is an interferometer composed of 66 independent systems, with specific maintenance requirements for each subsystem. To optimize the observation time and reduce downtime maintenance, requirements are very demanding. One subsystem with high maintenance efforts is cryogenics and vacuum. To organize the maintenance, the Cryogenic and Vacuum department is using and implementing different tools. These are monitoring and problem reporting systems and CMMS. This leads to different maintenance approaches: Preventive Maintenance, Corrective Maintenance and Condition Based Maintenance. In order to coordinate activities with other departments the preventive maintenance schedule is kept as flexible as systems allow. To cope with unavoidable failures, the team has to be prepared to work under any condition with the spares on time. Computerized maintenance management system (CMMS) will help to manage inventory control for reliable spare part handling, the correct record of work orders and traceability of maintenance activities. For an optimized approach the department is currently evaluating where preventive or condition based maintenance applies to comply with the individual system demand. Considering the change from maintenance contracts to in-house maintenance will help to minimize costs and increase availability of parts. Due to increased number of system and tasks the cryo team needs to grow. Training of all staff members is mandatory, in depth knowledge must be built up by doing complex maintenance activities in the Cryo group, use of advanced computerized metrology systems.

Cruzat, Fabiola



The Effects of Dissipation and Coarse Grid Resolution for Multigrid in Flow Problems  

NASA Technical Reports Server (NTRS)

The objective of this paper is to investigate the effects of the numerical dissipation and the resolution of the solution on coarser grids for multigrid with the Euler equation approximations. The convergence is accomplished by multi-stage explicit time-stepping to steady state accelerated by FAS multigrid. A theoretical investigation is carried out for linear hyperbolic equations in one and two dimensions. The spectra reveals that for stability and hence robustness of spatial discretizations with a small amount of numerical dissipation the grid transfer operators have to be accurate enough and the smoother of low temporal accuracy. Numerical results give grid independent convergence in one dimension. For two-dimensional problems with a small amount of numerical dissipation, however, only a few grid levels contribute to an increased speed of convergence. This is explained by the small numerical dissipation leading to dispersion. Increasing the mesh density and hence making the problem over resolved increases the number of mesh levels contributing to an increased speed of convergence. If the steady state equations are elliptic, all grid levels contribute to the convergence regardless of the mesh density.

Eliasson, Peter; Engquist, Bjoern



A resolution of the ascertainment sampling problem. II. Generalizations and numerical results.  

PubMed Central

The ascertainment problem arises when families are sampled by a nonrandom process and some assumption about this sampling process must be made in order to estimate genetic parameters. Under classical ascertainment assumptions, estimation of genetic parameters cannot be separated from estimation of the parameters of the ascertainment process, so that any misspecification of the ascertainment process causes biases in estimation of the genetic parameters. Ewens and Shute proposed a resolution to this problem, involving conditioning the likelihood of the sample on the part of the data which is "relevant to ascertainment." The usefulness of this approach can only be assessed by examining the properties (in particular, bias and standard error) of the estimates which arise by using it for a wide range of parameter values and family size distributions and then comparing these biases and standard errors with those arising under classical ascertainment procedures. These comparisons are carried out in the present paper, and we also compare the proposed method with procedures which condition on, or ignore, parts of the data.

Shute, N C; Ewens, W J



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

NASA Technical Reports Server (NTRS)

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.

Dill, Richard A.; Whitesides, R. Harold



Application of CFD analysis to design support and problem resolution for ASRM and RSRM  

NASA Astrophysics Data System (ADS)

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.

Dill, Richard A.; Whitesides, R. Harold



U.S. Navy Corrosion Control Maintenance.  

National Technical Information Service (NTIS)

This presentation describes the U. S. Navy Aircraft Corrosion Prevention/Control Maintenance Program. It presents maintenance practices, maintenance control procedures and corrective actions from discovery, resolution and documentation. It discusses a sys...

G. T. Browne



High-resolution fMRI: overcoming the signal-to-noise problem.  


Increasing the spatial resolution in functional Magnetic Resonance Imaging (fMRI) inherently lowers the signal-to-noise ratio (SNR). In order to still detect functionally significant activations in high-resolution images, spatial smoothing of the data is required. However, conventional non-adaptive smoothing comes with a reduced effective resolution, foiling the benefit of the higher acquisition resolution. We show how our recently proposed structural adaptive smoothing procedure for functional MRI data can improve signal detection of high-resolution fMRI experiments regardless of the lower SNR. The procedure is evaluated on human visual and sensory-motor mapping experiments. In these applications, the higher resolution could be fully utilized and high-resolution experiments were outperforming normal resolution experiments by means of both statistical significance and information content. PMID:19135087

Tabelow, Karsten; Piëch, Valentin; Polzehl, Jörg; Voss, Henning U



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

ERIC Educational Resources Information Center

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)

Eyring, LeRoy



Problem of mixtures with known compositions and IRONFLEA method for multivariate curve resolution.  


A special case of gray spectral data systems [(a) F.-T. Chau, Y.-Z. Liang, J. Gao, X.-G. Shao (Eds.), Chemometrics: From Basics to Wavelet Transform, Chemical Analysis Series, vol. 164, John Wiley & Sons, Inc., 2004; (b) Y.Z. Liang, O.M. Kvalheim, R. Manne, Chemom. Intell. Lab. Syst. 18 (1993) 235-250] is discussed here and the least-squares method for the multivariate curve resolution (MCR) named IRONFLEA is proposed. The system under consideration is the bilinear spectral data of the samples with known chemical compositions and unknown concentration matrix. If the spectra of samples (A(i)) and (Q+A(i)) (i = 1, ..., n, n > or = 2) are available, then the spectrum and the concentrations of Q could be found and the solution is unique. A practical chemical model for this problem could be mixtures, polymers, peptides, oligosaccharides, or supramolecular formations made of a limited number of monomeric components. In the cases of polymeric or oligomeric samples the spectral contributions and the concentrations of the particular monomeric units are extracted. The method is capable of extracting chemically meaningful spectra of components. The method is implemented in SAS IML code and tested for the deconvolution of spectra of polymers made of styrene derivatives with known monomeric compositions [(a) H. Fenniri, L. Ding, A.E. Ribbe, Y. Zyrianov, J. Am. Chem. Soc. 123 (2001) 8151-8152; (b) H. Fenniri, S. Chun, L. Ding, Y. Zyrianov, K. Hallenga, J. Am. Chem. Soc. 125 (2003) 10546-10560]. The method performs calculations fast enough to allow the incorporation of leave-one-out outlier removal procedure. PMID:17936106

Zyrianov, Yegor



Vegetation mapping using high resolution MSS (Multispectral Scanner) data: Canopy reflectance and shadow problems encountered and possible solutions  

SciTech Connect

High resolution Multispectral Scanner (MSS) data were acquired for an old field, successional habitat in South Carolina. The instrument used was a Daedalus Model DS-1268 having 1.5 x 1.5 m spatial resolution and 11 spectral bands. The goal was to map the vegetation of the study area and compute standing biomass. Upon examination of the MSS data, it became apparent that additional information would be required to accurately discriminate between the vegetation types because of (1) nonuniformity of canopy reflectance from individual trees due to sun angle and azimuth, and (2) shadows cast by trees. This paper describes the nature of the canopy reflectance problem, methods of removing the effects of shadows in high resolution MSS data, and the computation of biomass for the study area.

Jensen, J.R.; Hodgson, M.E.; Pinder, J.; Collins, B.S.; Mackey, H.E. Jr.



Maintenance, Repair and Alteration of Historic Buildings.  

National Technical Information Service (NTIS)

The report is a technical maintenance manual oriented to the problems inherent in the conservation of historic properties. It includes: inspection procedures; documentation procedures; restoration and maintenance of structural integrity; and maintenance; ...



Proactive maintenance initiatives at Argonne National Laboratory-West  

SciTech Connect

In the late 1980`s, ANL-W Management foresaw a need to provide dedicated technical support for maintenance supervisors. Maintenance supervisors were facing increased challenges to ensure all environmental, safety, and waste management regulations were followed in daily maintenance activities. This increased burden was diverting supervisory time away from on-the-job supervision. Supervisors were finding less time for their ``mentor`` roles to ensure maintenance focused on finding and correcting root causes. Additionally the traditional maintenance organization could not keep up with the explosion in predictive maintenance technologies. As a result, engineers were tasked to provide direct technical support to the maintenance organization. Today the maintenance technical support group consists of two mechanical engineers, two electrical engineers and an I&C engineer. The group provides a readily available, quick response resource for crafts people and their supervisors. They can and frequently do ask the support group for help to determine the root cause and to effect permanent fixes. Crafts and engineers work together informally to make an effective maintenance team. In addition to day-to-day problem solving, the technical support group has established several maintenance improvement programs for the site. This includes vibration analysis of rotating machinery, testing of fuel for emergency diesel generators, improving techniques for testing of high efficiency particulate air (HEPA) filters, and capacity testing of UPS and emergency diesel starting batteries. These programs have increased equipment reliability, reduced conventional routine maintenance, reduced unexpected maintenance, and improved testing accuracy. This paper will discuss the interaction of the technical support group within the maintenance department. Additionally the maintenance improvement programs will be presented along with actual cases encountered, the resolutions and lessons learned.

Duckwitz, N.R.; Duncan, L.W.; Whipple, J.J.



Extended Subject Access to Hypertext Online Documentation. Parts I and II: The Search-Support and Maintenance Problems.  

ERIC Educational Resources Information Center

Describes enhancements made to a hypertext information retrieval system at the National Energy Research Supercomputer Center (NERSC) called DFT (Document, Find, and Theseus). The enrichment of DFT's entry vocabulary is described, DFT and other hypertext systems are compared, and problems that occur due to the need for frequent updates are…

Girill, T. R.; And Others



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

PubMed Central

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.

Kirby, Robert M.; Johnson, Chris R.



Is the Resolution Style "Exiting Statements" Related to Adolescent Problem Behavior?  

ERIC Educational Resources Information Center

This study examined the association between the adolescents' conflict resolution style "exiting statements" (i.e., the expression of the adolescent' desire to minimize or end the contact with his or her parents) in parent-adolescent conflicts with self-rated adolescent GAD symptoms and delinquency symptoms of 1313 adolescents. A multi-group,…

Wijsbroek, Saskia A. M.; Hale, William W., III; Van Doorn, Muriel D.; Raaijmakers, Quinten A. W.; Meeus, Wim H. J.



Prosocial Problem-Solving Techniques for Conflict Resolution in the Kindergarten Classroom.  

ERIC Educational Resources Information Center

A practicum project was developed and implemented to reduce the incidents of aggressive behavior and impulsive actions among kindergarten students by means of win-win situations for conflict resolution. The objectives for the program were to achieve: (1) a 25 percent decrease of impulsive and aggressive behavior; (2) 50 percent of the target group…

Linde, Dorri B.


Resolution enhancement techniques in optical lithography: It's not just a mask problem  

NASA Astrophysics Data System (ADS)

Over the past decade, optical lithography's k1 factor has been continuously eroding despite aggressive improvements in exposure wavelength and numerical aperture. To compensate for the increased difficulty in maintaining adequate process windows at smaller k1's, lithographers have gradually introduced mild resolution enhancement techniques (RETs) such as the use of optical proximity correction (OPC) and attenuated phase shifted mask enhanced lithography (attPSM). The penetration of the k1=0.5 barrier with the 180nm technology node forced serious consideration of strong resolution enhancement techniques such as the use of sub-resolution assist features (SRAFs) with off-axis illumination (OAI), and alternating phase shifted mask enhanced lithography (altPSM). Penetrating into the deep-sub-k1=0.5 lithography regime for the 130nm and 100nm technology nodes requires broad implementation of these strong RETs in well integrated lithography solutions. After briefly reviewing the history and challenges associated with OPC, this paper will discuss the fundamental concepts and theoretical resolution limits of altPSM and SRAF followed by some experimental results. The paper will then review the challenges facing the implementation of SRAF and altPSM in deep-sub-k1=0.5 production lithography.

Liebmann, Lars W.



Study on Intelligent Expressway Maintenance System  

Microsoft Academic Search

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

Tao Han; Congdong Li



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

PubMed Central

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.

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



Management of industrial maintenance – economic evaluation of maintenance policies  

Microsoft Academic Search

One of the main problems, when choosing between preventive or corrective maintenance for the production and maintenance departments in the eight firms studied, is to attempt to establish the state of a particular production system or individual production line. In order to carry out a cost analysis it is imperative to be able to measure how preventive maintenance will both

Hans Löfsten




Microsoft Academic Search

Segmentation algorithms have already been recognized as a valuable and complementary approach that similar to human operators perform a region-based rather than a point-based evaluation of high-resolution and multi-source remotely sensed data. Goal of this paper is to summarize the state-of-the-art of respective segmentation methods by describing the underlying concepts which are rather complex in the case of processing remotely

J. Schiewe



Perceived Competency and Resolution of Homelessness Among Women with Substance Abuse Problems  

PubMed Central

Using a metasynthesis approach, our aim was to articulate new insights relating to the most efficient and effective means of helping homeless women with substance abuse problems to enhance their well-being and become more stably housed. Distorted perceptions of competency, which are shaped by dysfunctional relationships and mental health problems, make it challenging for women with substance abuse problems to resolve homelessness. Women with particularly low or high levels of perceived competency tend to grapple with challenges related to structure and control, trust, and hopelessness. Therapeutic strategies for approaching these women include careful assessment, caring, personalized structure and control, development of interpersonal trust, instillation of hope, and the targeted use of psychotherapeutic agents and counseling. Framing care for homeless women within the context of perceived competency offers a new way of understanding their plight and shaping interventions to more expeditiously move them toward healthy and stable lives.

Finfgeld-Connett, Deborah; Bloom, Tina L.; Johnson, E. Diane



General aviation avionics equipment maintenance  

NASA Technical Reports Server (NTRS)

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.

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



Selection and Resolution of Function Problems and Their Effects on Student Learning  

ERIC Educational Resources Information Center

This paper examines two experienced Turkish teachers', Ahmet and Burak, selection and implementation of function problems and relates this to the quality of their students' understanding of this notion. The research findings indicate that regardless of the task quality Ahmet engages, through process-oriented teaching, his students with the notion…

Bayazit, Ibrahim



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

ERIC Educational Resources Information Center

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)

Niaz, Mansoor



Policy Manual - Specimen Collection - Resolution of Problems wiht Specimen Procurement, Transp9ortation, or Handling

If a problem is identified in specimen transportation or quality, notify the Section Chief or Supervisor of the laboratory. It is the responsibility of the Section Chief or Supervisor to attempt to improve performance of clients or offices that frequently submit specimens improperly.


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

National Technical Information Service (NTIS)

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 ...

J. R. DeBonis



A Longitudinal Study on Substance Use and Related Problems in Women in Opioid Maintenance Treatment from Pregnancy to Four Years after Giving Birth  

PubMed Central

BACKGROUND Women in opioid maintenance treatment (OMT) have a past characterized by drug abuse, which is a challenging start for parenthood. Studies of mothers in OMT are typically limited to pregnancy and early infancy. Knowledge about how they cope with substance use and related problems in the years following birth is therefore important. The aims of the study were to examine changes in mothers’ substance use, psychological problems, and other challenges; from one to four years after their children were born, and describe kindergarten attendance and prevalence and type of child protective services involvement when the children were four years old. METHOD A four-year prospective cohort study of mothers in OMT. The European severity index was used to map substance use and related problems during the third trimester of pregnancy, one and four years after birth. RESULTS At the four-year follow-up, use of illegal substances remained low (4%) and use of legal substances (39%) was similar to the one-year follow-up. The proportion of women with psychological problems was significantly higher than at one-year follow-up (69 vs. 39%, P = 0.009). At age four, most children (89%) attended kindergarten, and the child protective services were following 73% of the families, mostly with voluntary measures. CONCLUSION Mothers in OMT cope well with substance use over time, given access to sufficient support. The findings imply that a preventive governmental strategy with close support of mother and child, have a positive impact contributing to making OMT and motherhood more compatible.

Lund, Ingunn O; Brendryen, Havar; Ravndal, Edle



Oil shale mining claims: alternatives for resolution of an ancient problem  

SciTech Connect

Oil shale reserves have the potential of making a great contribution to the energy needs of the nation. A primary obstacle to developing oil shale properties, however, is the uncertainty of the legal principles governing the validity of oil shale mining claims. In this article, the author considers the issues as they historically evolved, evaluates the present status of the law and explores alternatives which could hopefully resolve the problems.

Duncan, T.H.



High-resolution cesium magnetometer surveys used as a tool to help solve water quality problems.  

NASA Astrophysics Data System (ADS)

On May 11, 1999 Oregon State University received notice from the Oregon Department of Agriculture of excessive levels of e.Coli in Oak Creek. Spraying liquid manure on OSU research diary fields is a strong candidate for the source, but the method of transport of manure from the fields to the creek remains elusive. During summer 2000, cesium magnetometers in vertical gradient mode successfully identified sub-surface pipes and features. A cesium gradiometer records the magnitude of the local earth's magnetic field to an accuracy of 0.1 nanotesla while taking a reading every tenth of a second. A high-resolution survey of portions of the dairy identified the magnetic signature of ceramic drain tiles, metal pipes, and other features that do not appear in historic documents. Future surveys will explore the extent and relationship of these sub-surface features, and identify their potential role in transporting manure from the dairy fields to Oak Creek.

Rogers, Michael; Cassidy, James; Dragila, Maria



Health problems and help-seeking activities of methadone maintenance clients at Auckland Methadone Service (AMS): potential for community pharmacy service expansion?  

PubMed Central

Background In general the health of methadone clients has been found to be poorer than that of the general population. In New Zealand specialist drug services are not funded to provide primary healthcare services. Many health conditions could potentially be managed by community pharmacists who have frequent contact with this client group. This study sought to explore the health problems suffered by methadone clients, who they sought help from, and the potential for greater involvement of pharmacists. Methods Self-completion questionnaire of methadone maintenance clients managed in specialist care in Auckland, New Zealand. Results The most common health problem experienced by these clients in the past three months was sweating (70.0%), and more than half of the respondents also reported experiencing headache, fatigue and depression. The least frequently experienced conditions were hay fever (12.9%) and abscesses (12.1%). Respondents indicated that the top three choices from whom they would seek help were GP (56.7%), the client's partner (31.6%) and community pharmacists (27.9%). Barriers to seeking help from pharmacists included issues around cost, perceptions of pharmacist knowledge and skills, privacy and confidentiality. Conclusion Methadone clients in this study indicated that they suffered a number of general health problems, and in many cases were likely to seek help from a GP or their own partner, before seeking help from pharmacists. However, for over one quarter of respondents the pharmacist was in the top three from whom they would seek advice. Any barriers towards consulting pharmacists, in the main seem to be resolvable.

Sheridan, Janie; Wheeler, Amanda; Walters, Carina



Does consciousness really collapse the wave function? A possible objective biophysical resolution of the measurement problem.  


An analysis has been performed of the theories and postulates advanced by von Neumann, London and Bauer, and Wigner, concerning the role that consciousness might play in the collapse of the wave function, which has become known as the measurement problem. This reveals that an error may have been made by them in the area of biology and its interface with quantum mechanics when they called for the reduction of any superposition states in the brain through the mind or consciousness. Many years later Wigner changed his mind to reflect a simpler and more realistic objective position which appears to offer a way to resolve this issue. The argument is therefore made that the wave function of any superposed photon state or states is always objectively and stochastically changed within the complex architecture of the eye in a continuous linear process initially for most of the superposed photons, followed by a discontinuous nonlinear collapse process later for any remaining superposed photons, thereby guaranteeing that only final, measured information is presented to the brain, mind or consciousness. An experiment to be conducted in the near future may enable us to simultaneously resolve the measurement problem and also determine if the linear nature of quantum mechanics is violated by the perceptual process. PMID:16009281

Thaheld, Fred H



Aplicacao da Inteligencia Artificial a Resolucao do Probelma da Distribuicao (Application of the Artificial Intelligence to the Resolution of the Vehicle Routing Problem).  

National Technical Information Service (NTIS)

Two solutions of the basic distribution problem are studied and compared: the exact, which uses the technique of branch and bound and the approximate resolution which uses the heuristic method of Jameson and Mole. The exact resolution by the tree search a...

J. C. S. Brandao



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


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

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



S-Genius, a universal software platform with versatile inverse problem resolution for scatterometry  

NASA Astrophysics Data System (ADS)

S-Genius is a new universal scatterometry platform, which gathers all the LTM-CNRS know-how regarding the rigorous electromagnetic computation and several inverse problem solver solutions. This software platform is built to be a userfriendly, light, swift, accurate, user-oriented scatterometry tool, compatible with any ellipsometric measurements to fit and any types of pattern. It aims to combine a set of inverse problem solver capabilities — via adapted Levenberg- Marquard optimization, Kriging, Neural Network solutions — that greatly improve the reliability and the velocity of the solution determination. Furthermore, as the model solution is mainly vulnerable to materials optical properties, S-Genius may be coupled with an innovative material refractive indices determination. This paper will a little bit more focuses on the modified Levenberg-Marquardt optimization, one of the indirect method solver built up in parallel with the total SGenius software coding by yours truly. This modified Levenberg-Marquardt optimization corresponds to a Newton algorithm with an adapted damping parameter regarding the definition domains of the optimized parameters. Currently, S-Genius is technically ready for scientific collaboration, python-powered, multi-platform (windows/linux/macOS), multi-core, ready for 2D- (infinite features along the direction perpendicular to the incident plane), conical, and 3D-features computation, compatible with all kinds of input data from any possible ellipsometers (angle or wavelength resolved) or reflectometers, and widely used in our laboratory for resist trimming studies, etching features characterization (such as complex stack) or nano-imprint lithography measurements for instance. The work about kriging solver, neural network solver and material refractive indices determination is done (or about to) by other LTM members and about to be integrated on S-Genius platform.

Fuard, David; Troscompt, Nicolas; El Kalyoubi, Ismael; Soulan, Sébastien; Besacier, Maxime




Microsoft Academic Search

This study investigated the relationship between working alliance and problem resolution, among other variables, from the perspective of 102 coaches with psychology or counseling backgrounds. Results of the analyses suggested that coaches' perceptions of the working alliance were positively associated with problem resolution in both face-to-face and distance (e.g., phone) coaching. No significant differences were found in working alliance or

Rhonda M. Berry; Jeffrey S. Ashby; Philip B. Gnilka; Kenneth B. Matheny



Regular methods of solution of ill-posed problems for remote sensing of Earth atmosphere using high-resolution spectrometry  

NASA Astrophysics Data System (ADS)

General regular methods of solution of ill-posed inverse problems and their application to geophysical sounding of Earth interior were developing during long time at Institute of Mathematics and Mechanics of Ural Branch of RAS. In this paper we apply the developed regular methods of solution of the inverse problems for retrieval of vertical temperature profiles from high-resolution thermal emission spectra of atmosphere observed at nadir. Synthetic spectra of sensor like 1MG have been used to test the methods in frame of computational experiments of retrieval of vertical temperature profile. These synthetic spectra were simulated for clear sky weak aerosol atmosphere with line-by-line forward model FIRE-ARMS then convoluted with 1MG instrumental line shape function, arid equivalent nose of 1MG was added. In order to retrieve vertical temperature profile within 0-70 km, we used emission spectra of atmosphere of CO II band in the range of 680-830 cm -1. The computational experiments showed good convergence of all methods started from different initial guess profiles to the target T-profile (known T-profile) with average standard deviation in troposphere within 1K. Deviations of different methods are within 1.5 K. The methods were also applied to temperature retrieval from real data of VIRTEM measurements when emission spectra of the atmosphere were obtained simultaneously with measurements of temperature and humidity profiles over water surface using airplane for elevations up to 8 km. It's shown that the regular methods of solution of inverse problem allow retrieving temperature profile from down-looking high-resolution atmospheric emission spectra with acceptable accuracy even if initial guess atmospheric states are quite far from the target T-profile.

Vasin, V. V.; Gribanov, K. G.; Zakharov, V. I.; Akimova, E. N.; Perestoronina, G. Ya.; Timerkhanova, L. Yu.



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

NASA Technical Reports Server (NTRS)

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.

DeBonis, James R.



The Prerogative of "Corrective Recasts" as a Sign of Hegemony in the Use of Language: Further Thoughts on Eric Hauser's (2005) "Coding 'Corrective Recasts': The Maintenance of Meaning and More Fundamental Problems"  

ERIC Educational Resources Information Center

The objective of this response article is to think through some of what I see as the far-reaching implications of a recent paper by Eric Hauser (2005) entitled "Coding 'corrective recasts': the maintenance of meaning and more fundamental problems". Hauser makes a compelling, empirically-backed case for his contention that, contrary to widespread…

Rajagopalan, Kanavillil



Preventative Maintenance.  

ERIC Educational Resources Information Center

Boards of education must be convinced that spending money up front for preventive maintenance will, in the long run, save districts' tax dollars. A good program of preventive maintenance can minimize disruption of service; reduce repair costs, energy consumption, and overtime; improve labor productivity and system equipment reliability; handle…

Migliorino, James


Comparing effectiveness and efficiency in technical specifications and maintenance optimization  

Microsoft Academic Search

Optimization of technical specification requirements and maintenance (TS&M) has been found interesting from the very beginning at Nuclear Power Plants (NPPs). However, the resolution of such a kind of optimization problem has been limited often to focus only on individual TS&M-related parameters (STI, AOT, PM frequency, etc.) and\\/or adopting an individual optimization criterion (availability, costs, plant risks, etc.). Nevertheless, a

Sebastián Martorell; Ana Sánchez; Sof??a Carlos; Vicente Serradell



Landscaping With Maintenance in Mind.  

ERIC Educational Resources Information Center

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)

Sorensen, Randy



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

NASA Technical Reports Server (NTRS)

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.

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



Privatizing Maintenance.  

ERIC Educational Resources Information Center

Schools and other government facilities want to see whether privatization of maintenance can provide services as efficiently and at less cost than inhouse workers. Privatization proponents say that everyone will benefit the most if the bidding process involves competition. Offers examples from the Memphis City Schools and the Union Public Schools…

Hounsell, Dan



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


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

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



Incremental maintenance of views with duplicates  

Microsoft Academic Search

We study the problem of efficient maintenance of materialized views that may contain duplicates. This problem is particularly important when queries against such views involve aggregate functions, which need duplicates to produce correct results. Unlike most work on the view maintenance problem that is based on an algorithmic approach, our approach is algebraic and based on equational reasoning. This approach

Timothy Griffin; Leonid Libkin



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)

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.

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



Convergence of a Time?Stepping Scheme for Rigid?Body Dynamics and Resolution of Painlevé's Problem  

Microsoft Academic Search

.  This paper gives convergence theory for a new implicit time?stepping scheme for general rigid?body dynamics with Coulomb friction\\u000a and purely inelastic collisions and shocks. An important consequence of this work is the proof of existence of solutions of\\u000a rigid?body problems which include the famous counterexamples of Painlev?. The mathematical basis for this work is the formulation\\u000a of the rigid?body problem

David E. Stewart



Assigning a probability density function for the value of a quantity based on discrete data: the resolution problem  

NASA Astrophysics Data System (ADS)

It often happens that knowledge about a particular quantity has to be reached by processing a series of resolution-limited indications. It is a well-established fact that if the variability of the data is large compared with the resolution interval, the effect of discretization can be ignored. Otherwise, it needs to be taken into account since it can then be an important source of uncertainty, sometimes more significant than randomness itself. The objective of this paper is to derive a probability density function (pdf) for the value of a quantity based on discretized data. This pdf allows the standard uncertainty associated with the best estimate of the quantity to be computed and, perhaps more importantly, it can be used as an input to evaluate a measurement model in which the quantity is involved. Bayesian concepts are used towards this goal. Although reaching an appropriate pdf has been attempted before, limited success has been attained, as the pdfs that have been obtained exhibit some undesirable characteristics. Herein a new approach is proposed. Unlike previous efforts, this time the quantity of interest is modelled as a sum of two other quantities, one that can only assume discrete values and the other that takes values within the resolution interval centred on zero. The resulting pdf exhibits a satisfactory behaviour, but further work would be required to provide firmer theoretical grounds for the employed prior.

Lira, I.



On the application of mathematical models in maintenance  

Microsoft Academic Search

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

Philip A. Scarf



Industrial Maintenance Strategies  

Microsoft Academic Search

Industrial plants have become more complex due to technological advancement. This has made the task of maintenance more difficult. The maintenance costs in terms of resources and downtime loss are so high that maintenance function has become a critical factor in a plant's profitability. Industry should devote as much forethought to the management of maintenance function as to production. Maintenance

Sajjad Akbar



On the Resolution of a Class of Waveguide Discontinuity Problems by the Use of Singular Integral Equations  

Microsoft Academic Search

It is shown that a considerable number of solutions of rectangular waveguide problems appearing in the literature are all special cases of a general treatment focused around the known solution of a singular integral equation. In terms of this a number of typical results are re-examined. The method is then applied to four new configurations, and the range of application

L. Lewin



Instrument air systems: A guide for power plant maintenance personnel  

Microsoft Academic Search

Instrument Air System maintenance problems have recently drawn wide attention from the Nuclear Power Industry and the regulatory agencies. This reference manual is designed to help power plant maintenance personnel understand, evaluate and resolve instrument air system problems. This can also be used as training guide for maintenance personnel or system engineers. Manual describes in detail the instrument air system,

V. Varma; S. Preckwinkle; K. Webber



A framework for benchmarking appropriate productive maintenance  

Microsoft Academic Search

Addresses problems with the practical implementation of total productive maintenance (TPM), and presents a rather appropriate approach to TPM implementation. This approach is termed by the author as appropriate productive maintenance (APM). The APM concept offers a rigorous methodology that utilises several tools to achieve a world-class manufacturing (WCM) status. A modelling tool, called IDEFO, is used to map the

Ashraf W. Labib



Application of a wavelet-Galerkin method to the forward problem resolution in fluorescence diffuse optical tomography.  


Fluorescence diffuse optical tomography is a powerful tool for the investigation of molecular events in studies for new therapeutic developments. Here, the emphasis is put on the mathematical problem of tomography, which can be formulated in terms of an estimation of physical parameters appearing as a set of Partial Differential Equations (PDEs). The standard polynomial Finite Element Method (FEM) is a method of choice to solve the diffusion equation because it has no restriction in terms of neither the geometry nor the homogeneity of the system, but it is time consuming. In order to speed up computation time, this paper proposes an alternative numerical model, describing the diffusion operator in orthonormal basis of compactly supported wavelets. The discretization of the PDEs yields to matrices which are easily computed from derivative wavelet product integrals. Due to the shape of the wavelet basis, the studied domain is included in a regular fictitious domain. A validation study and a comparison with the standard FEM are conducted on synthetic data. PMID:20372573

Landragin-Frassati, Anne; Bonnet, Stéphane; Da Silva, Anabela; Dinten, Jean-Marc; Georges, Didier



Thermography instruments for predictive maintenance  

SciTech Connect

Thermography (infrared imaging, or IR scanning) is not only the most versatile predictive maintenance technology available today; it is, in general, the most cost-effective. Plant engineering can apply a virtually unlimited variety of predictive maintenance instruments, but all are restricted regarding the types of existing and incipient problems they can detect. Inplant applications of thermography, however, are truly limited only by the extent of the plant engineer's imagination. Here are ways that thermography can be used to fight downtime in plants, and factors to consider when selecting the best instrument for particular circumstances.

Palko, E.



Positioning embedded software maintenance within industrial maintenance  

Microsoft Academic Search

Little is known about of how software embedded in complex industrial technical systems is maintained. In this paper, we identify industrial maintenance process steps and position software maintenance activities within them. We do this in the context of JAS 39 Gripen, a multi-role combat aircraft developed by Saab.

Ramin Karim; Mira Kajko-mattsson; Peter Soderholm; Olov Candell; Tommy Tyrberg; Hans Ohlund; Jan Johansson



Transit bus maintenance management  

SciTech Connect

The 8 papers in the report deal with the following areas: some recent developments in summary; research needs in transit-bus maintenance; transit-bus maintenance in New York State; issues and analysis; management of transit-bus prerun inspections; application of a transit-maintenance management-evaluation procedure; analysis of bus transit's maintenance efficiency using section 15 data; climatic effects on bus durability; exploring the multiple factor concept for bus maintenance using simulation; effectiveness of improved repair scheduling in the performance of bus-transit maintenance.

Andrle, S.J.; Zimmerman, J.F.; Duffy, J.; Foerster, J.F.; Puente, S.



Tool and Machine Maintenance.  

National Technical Information Service (NTIS)

UNIDO publication on maintenance and repair in wood processing (based on experience in Yugoslavia) - covers (1) bandsaw blades, sharpening process and equipment (2) circular saws for edging and trimming (3) maintenance of tungsten carbide circular saw bla...

J. Borstnar



Artcc Maintenance Communication, Jacksonville.  

National Technical Information Service (NTIS)

The proposed Maintenance Communications System for NAS Stage A, Jacksonville ARTCC, provides an interphone switching system that meets the voice maintenance communications requirements for the facility. The best technical/economical approach is to expand ...

W. R. Miller



Transit Bus Maintenance Management.  

National Technical Information Service (NTIS)

The 8 papers in the report deal with the following areas: some recent developments in summary; research needs in transit bus maintenance; transit bus maintenance in New York State; issues and analysis; management of transit bus prerun inspections; applica...

S. J. Andrle J. F. Zimmerman J. Duffy J. F. Foerster S. Puente



Substation Reliability Centered Maintenance.  

National Technical Information Service (NTIS)

Substation Reliability Centered Maintenance (RCM) is a technique that is used to develop maintenance plans and criteria so the operational capability of substation equipment is achieved, restored, or maintained. The objective of the RCM process is to focu...

S. L. Purucker



Facilities maintenance handbook  

NASA Technical Reports Server (NTRS)

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.



Asphalt in Pavement Maintenance.  

ERIC Educational Resources Information Center

Maintenance methods that can be used equally well in all regions of the country have been developed for the use of asphalt in pavement maintenance. Specific information covering methods, equipment and terminology that applies to the use of asphalt in the maintenance of all types of pavement structures, including shoulders, is provided. In many…

Asphalt Inst., College Park, MD.


Microform Reader Maintenance.  

ERIC Educational Resources Information Center

Describes experiences in organizing a program of microform reader and reader/printer maintenance at Texas A & M's Sterling C. Evans Library and offers guidelines for regular machine maintenance and repair. Guidelines discussed relate to maintenance philosophy, general machine cleaning, troubleshooting, service contracts, supplies, recordkeeping,…

Hall, Hal W.; Michaels, George H.



Common S2ENCE maintenance  

Microsoft Academic Search

Intermediate level avionics maintenance requires diagnostic assessment, repair, and flight certification steps. The current Automated Test Systems (ATS) are primarily designed to verify equipment end-to-end function (flight certification), so they are not optimized to support diagnostic procedures. An operator typically performs problem diagnosis at the beginning of the end-to-end test without any automated access to existing evidence of the likely

Simon M. Jessop; Johan Reimann; Patrick W. Kalgren



Advanced servomanipulator remote maintenance demonstration  

SciTech Connect

The advanced servomanipulator (ASM) is a dual-arm, force-reflecting, master/slave servomanipulator that was designed for remote maintenance applications and is digitally controlled. The ASM is installed in the Maintenance Systems Test Area (MSTA) of the Fuel Recycle Division at the Oak Ridge National Laboratory. The unique aspect of ASM is that the slave arms were designed to be remotely maintainable, using a similar remote manipulator system, to maximize availability and minimize downtime. This test report describes the results of the maintenance testing conducted on ASM. Demonstration of the ability to maintain ASM remotely is an important precursor to the ultimate application of ASM in a totally remote facility. The approach taken in the design of ASM was for the manipulator slave arms to be composed of modules capable of being removed and replaced by another manipulator system of similar capabilities. The ASM incorporates gear and torque tube drives with drive couplings that facilitate remote maintenance. Although the use of special fixtures is normally discouraged for remote maintenance, special fixtures were required for this demonstration due to the complex nature of the slave arms. This test was performed to demonstrate that the ASM slave arms could be completely disassembled and reassembled remotely. Maintenance of ASM was successfully demonstrated using the M-2 servomanipulator and special fixtures. The entire disassembly process took about 4 h, and the assembly took about 3 1/2 h. Although there were some problems, in general, the arm modules were adequately designed for remote removal and replacement. Recommendations, which are documented in this report, have been made for improvements. 5 refs., 22 figs., 1 tab.

Ray, T.L.; Bradley, E.C.



Maintenance anomalies in rule-based expert systems  

Microsoft Academic Search

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

Richard C. Hicks



Innovation for maintenance technology improvements  

NASA Technical Reports Server (NTRS)

A group of 34 submitted entries (32 papers and 2 abstracts) from the 33rd meeting of the Mechanical Failures Prevention Group whose subject was maintenance technology improvement through innovation. Areas of special emphasis included maintenance concepts, maintenance analysis systems, improved maintenance processes, innovative maintenance diagnostics and maintenance indicators, and technology improvements for power plant applications.

Shives, T. R. (editor); Willard, W. A. (editor)



Offshore maintenance reduces cost and downtime  

SciTech Connect

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.

Danahy, J.W.



Status of fusion maintenance  

SciTech Connect

Effective maintenance will be an essential ingredient in determining fusion system productivity. This level of productivity will result only after close attention is paid to the entire system as an entity and appropriate integration of the elements is made. The status of fusion maintenance is reviewed in the context of the entire system. While there are many challenging developmental tasks ahead in fusion maintenance, the required technologies are available in several high-technology industries, including nuclear fission.

Fuller, G.M.



Industrial Maintenance Strategies  

SciTech Connect

Industrial plants have become more complex due to technological advancement. This has made the task of maintenance more difficult. The maintenance costs in terms of resources and downtime loss are so high that maintenance function has become a critical factor in a plant's profitability. Industry should devote as much forethought to the management of maintenance function as to production. Maintenance has grown from an art to a precise, technical engineering science. Planning, organizing scheduling and control of maintenance using modern techniques pays dividends in the form of reduced costs and increased reliability. The magnitude and the dimension of maintenance have multiplied due to development in the engineering technologies. Production cost and capacities are directly affected by the breakdown time. Total operating cost including the maintenance cost plays an important role in replacement dimension. The integrated system approach would bring forth the desired results of high maintenance standards. The standards once achieved and sustained, would add to the reliability of the plan and relieve heavy stresses and strains on the engineering logistic support. (author)

Sajjad Akbar [Riphah International University, 274-Peshawar Road Rawalpindi (Pakistan)



Reliability based generator maintenance scheduling using hybrid evolutionary approach  

Microsoft Academic Search

Maintenance scheduling of generating units is very important for the reliable operation of units. This paper presents a hybrid evolutionary algorithm to tackle the Generator Maintenance Scheduling (GMS) problem. The paper assumes a reliability objective function for the GMS problem. A new local search method which is derived from Extremal Optimization (EO) and Genetic Algorithm (GA) is presented. The proposed

Ehsan Reihani; M. Davodi; M. Najjar; Reza Norouzizadeh



Effective maintenance: an essential ingredient of successful mining operations  

SciTech Connect

In today's mining industry the maintenance of production equipment has emerged as a vital function that is getting a significant amount of attention. Mine managers are becoming increasingly aware of the need to improve maintenance practices and accomplish the maintenance function effectively. Costs are a major problem. It is no longer possible for mine management to relegate maintenance to the status of a necessary evil. Maintenance must be managed. It must be an integral part of the whole production strategy. Production managers and supervisors are finding that they must do more than yell for help. They realize now that their input is necessary in planning, scheduling, ensuring preventive maintenance services are adequate, or determining when equipment must be overhauled or replaced. Maintenance departments are having to adopt up-to-date management and control techniques. More sophisticated equipment is demanding higher levels of training and worker proficiency. Analytical procedures are being introduced. Engineering is becoming a necessary element of overall maintenance actions.

Tomlingson, P.D.



Bridge and pavement maintenance  

NASA Astrophysics Data System (ADS)

Deterioration of New York State Highway structures; precast repair of continuously reinforced concrete pavement (abridgment) patching of continuously reinforced concrete pavements, evaluation of several maintenance methods for continuously reinforced concrete pavement, patching jointed concrete pavements, highway pavement repairs by using polymer concrete, pressure grouting of concrete pavements, and choosing cost-effective maintenance are discussed.

Fitzpatrick, M. W.; Law, D. A.; Dixon, W. C.; Elkins, G. E.; Mucullough, B. F.; Darter, M. I.; Yoder, E. J.; Florence, R. H., Jr.; Virkler, S. J.; McGhee, K. H.



Fixing Maintenance Productivity.  

ERIC Educational Resources Information Center

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…

Fickes, Michael



Maximizing Hard Floor Maintenance.  

ERIC Educational Resources Information Center

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…

Steger, Michael



Maintenance Trades Guidelines  

ERIC Educational Resources Information Center

In 2002, APPA published "Maintenance Staffing Guidelines for Educational Facilities," the first building maintenance trades staffing guideline designed to assist educational facilities professionals with their staffing needs. addresses how facilities professionals can determine the appropriate size and mix of their organization. Contents include…

Weidner, Theodore J.



Association Rules Based Research On Man-Made Mistakes In Aviation Maintenance: A Case Study  

Microsoft Academic Search

It's an important problem for aviation maintenance enterprise to assure quality of maintenance activity. Thinking over human factors and organization management, the paper produces a production system continuous improvement model for aviation maintenance quality. First, the model gathers characteristics of human factors and man-made maintenance mistakes. Based on association rules, relationships between human factors and the man-made mistakes are found.

Ren-qian Zhang; Jun-ling Yang



Maintenance information: value added?  

SciTech Connect

A study of how well the mining industry uses information management systems for maintenance suggests there's plenty of room for improvement. The article presents results of a study of 13 mining and mineral processing operations over a four year period combined with a questionnaire completed by 91 attendees at seminars. None of the organizations had a well-defined, documented maintenance program and consequently were not able to use information effectively. Packaged information system providers did not recognise that industrial maintenance organizations had different information needs.

Tomlingson, P.D. [Paul D Tomlingson Associates, Denver, CO (United States)



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.



Methadone maintenance treatment and drugs.  


The mental and physical capabilities of drivers in traffic are often seriously challenged these days. Not only do they need to concentrate on driving, predict connections between various phenomena, take appropriate judgements in current situations and foresee the sequence of measures to be taken, but they are also expected to be emotionally stable, etc. The problem with drugs in traffic is often encountered when assessing the actual safe driving capability of a person in a given moment, for example after a car accident or a police check, or medical check-ups that are required for a driving license. The Road Traffic Safety Law considers methadone a drug. Drug addicts do not meet the health standards required of drivers. This research program deals with the attitude of drivers who are in methadone maintenance treatment programs with respect to the driving ability as well as the effects of methadone use in combination with other drugs on driving. It has been established that drivers undergoing the methadone maintenance program, regularly drive not only under the influence of methadone but also under the influence of marijuana (20%) and heroin (18%) and sometimes under the influence of marijuana (58.6%), heroin (55.7%), and alcohol (48.6%). Certain initiatives have been taken by some therapists to give, under certain circumstances, a clean bill of health to responsible methadone maintenance patients who have an adequate level of responsibility for themselves and their deeds, in order to help them obtain a driving license. Since it has been established that methadone maintenance patients use methadone quite commonly in combination with illegal drugs and/or alcohol, the classification of this type of addicts among possible driving candidates remains disputable. Long term interdisciplinary research is still required to determine the basic principles required to asses and possibly admit this type of drivers to participate in traffic, as well as to determine which professional therapists can participate and evaluate the driving capabilities of these patients. PMID:12137290

Bilban, M; Bilban Jakopin, C



Health Maintenance Organizations and the Elderly: Promises, Problems and Prospects. Hearing before the Select Committee on Aging. House of Representatives, Ninety-Ninth Congress, Second Session (Boynton Beach and Margate, FL). Part II.  

ERIC Educational Resources Information Center

This document contains witness testimonies and prepared statements from the Congressional hearing to examine the efficiency of health maintenance organizations (HMOs) in providing medical care to the elderly. Opening statements are given by Congressmen Mica and Boucher. The hearing is organized into a morning and afternoon session with each…

Congress of the U.S., Washington, DC. House Select Committee on Aging.


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.  

National Technical Information Service (NTIS)

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 difficul...

C. S. Weaver R. F. Klausmeier



Carpet Maintenance Guide.  

ERIC Educational Resources Information Center

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)

Griffin, William R.



Carpet Maintenance Handbook.  

National Technical Information Service (NTIS)

Increased use of carpet and carpet tile in Air Force facilities has resulted in the need for comprehensive guidance and better maintenance practices. This handbook includes guidance on methods to reduce soiling, prolong carpet life, and improve maintenanc...



Getting into Motorcycle Maintenance  

ERIC Educational Resources Information Center

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)

Mosher, Lynn



Care and Maintenance.  

ERIC Educational Resources Information Center

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)

Hampton, Carolyn H.; Hampton, Carol D.



Lunar robotic maintenance module  

NASA Technical Reports Server (NTRS)

A design for a robotic maintenance module that will assist a mobile 100-meter lunar drill is introduced. The design considers the following areas of interest: the atmospheric conditions, actuator systems, power supply, material selection, weight, cooling system and operation.

Ayres, Michael L.



Maintenance of NDE Websites.  

National Technical Information Service (NTIS)

This project will maintain one operational Time Domain Reflectrometry (TDR) field station and the associated web site. Maintenance of such a site supports three principal activities of ITI: (1) adoption by State DOT's of the the TDR technology, (2) displa...

C. Dowding



Woodwind Instrument Maintenance.  

ERIC Educational Resources Information Center

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)

Sperl, Gary



Reliability-Centered Maintenance.  

National Technical Information Service (NTIS)

This book explains basic concepts, principles, definitions, and applications of a logical discipline for development of efficient scheduled (preventive) maintenance programs for complex equipment, and the on-going management of such programs. Such program...

F. S. Nowlan H. F. Heap



Reliability Centred Maintenance  

Microsoft Academic Search

Reliability centred maintenance (RCM) is a method for maintenance planning that was developed within the aircraft industry\\u000a and later adapted to several other industries and military branches. A high number of standards and guidelines have been issued\\u000a where the RCM methodology is tailored to different application areas, e.g., IEC 60300-3-11, MIL-STD-217, NAVAIR 00-25-403 (NAVAIR 2005), SAE JA 1012 (SAE 2002),

Marvin Rausand; Jørn Vatn


Estimation of Highway Maintenance Marginal Cost under Multiple Maintenance Activities  

Microsoft Academic Search

This paper focuses on the estimation of highway maintenance marginal costs. Highway maintenance marginal cost has been estimated in the literature using the perpetual overlay indirect approach. This approach assumes that pavement overlay costs dominate maintenance costs and ignores other maintenance activities. This paper focuses on two questions. First, is it acceptable to ignore the less costly activities? Second, if

Shadi B. Anani; Samer M. Madanat



View Maintenance in a Warehousing Environment  

Microsoft Academic Search

A warehouse is a repository of integrated information drawn from remote data sources. Since a warehouse effectively implements materialized views, we must maintain the views as the data sources are updated. This view maintenance problem differs from the traditional one in that the view definition and the base data are now decoupled. We show that this decoupling can result in

Yue Zhuge; Hector Garcia-Molina; Joachim Hammer; Jennifer Widom



Corrective Maintenance Optimization in an Air Force  

Microsoft Academic Search

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)

Hoong Chuin Lau; Kok Yong NEO; Wee Chong WAN



Maintenance and Security Begin at Home  

ERIC Educational Resources Information Center

Sometimes districts can improve their maintenance and security and find more efficient and less costly approaches to both areas when they tap their own personnel resources. Illustrations show how effectively problems have been dealt with by people of talent and ability "within the system." (Author/MLF)

School Management, 1974



Coal pile environmental impact problems  

SciTech Connect

Some of such problems are discussed briefly: water pollution; ground water contamination; air pollution by fugitive dust; noise generated by maintenance machinery; fires and safety; aesthetics; and solutions of such problems.

Cross, F.L.



Synchrotron-based highest resolution Fourier Transform infrared spectroscopy of naphthalene (C10H8) and indole (C8H7N) and its application to astrophysical problems.  


We report a rotationally resolved analysis of the high resolution FTIR spectrum of naphthalene which can be considered as a prototypical molecule for polycyclic aromatic hydrocarbons (PAHs), and a similar analysis for the prototypical heterocyclic aromatic molecule indole. The spectra have been measured using a resolution of 0.0008 cm(-1) (21 MHz) with the new high resolution FTIR prototype spectrometer of the Molecular Kinetics and Spectroscopy Group at ETH Zürich. The spectrometer is connected to the infrared port available at the Swiss Light Source (SLS) at the Paul-Scherrer-Institute (PSI). Due to the high brightness of the synchrotron radiation in the spectral region of interest, effectively up to 20 times brighter than thermal sources, and the high resolution of the new interferometer, it was possible to record the rotationally resolved infrared spectra of naphthalene and indole at room temperature, and to analyse the ?46 c-type band (??(0) = 782.330949 cm(-1)) of naphthalene as well as the ?35 c-type band (??(0) = 738.483592 cm(-1)) of indole and an a-type band at ??(0) = 790.864370 cm(-1) tentatively assigned as the overtone 2?(40) of indole. The results of the naphthalene band analysis are discussed in relation to the Unidentified Infrared Band (UIB) found in interstellar spectra at 12.8 ?m. PMID:22457945

Albert, Sieghard; Albert, Karen Keppler; Lerch, Philippe; Quack, Martin



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

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

O. Jahn; C. Hill; D. Neckels



Innovation in facilities maintenance management  

Microsoft Academic Search

This paper highlights the function and the implications of a strategic maintenance management system in relation to building maintenance performance. The paper examines the technical and management functions in building maintenance and highlights the issues of quality management, contract management, resourcing strategy and the innovation processes required in the organizational drive towards effective and efficient maintenance management systems. The paper

M Pitt; S Goyal; M Sapri



Industry initiative to improve maintenance at nuclear power plants  

Microsoft Academic Search

The author focuses on highlights of the Institute of Nuclear Power Operations (INPO) evaluation process, industry maintenance initiatives, and industry progress in resolving generic equipment problems, such as motor-operated valves. Also included are some of the emerging maintenance issues facing the nuclear power industry and the present status of some nuclear industry performance indicators

G. R. Peterson




Microsoft Academic Search

An evaluation of public transit maintenance and storage facilities in Florida was performed to determine the stormwater quality of runoff from these facilities and to evaluate the validity of the EPA's assumption of stormwater runoff pollution problems. The characteristics of the facilities were investigated to evaluate the potential for stormwater runoff pollution. These characteristics included maintenance performed at the facilities,

Andrew Dzurik; Danuta Leszcynska


Towards a General-Purpose Belief Maintenance System.  

ERIC Educational Resources Information Center

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…

Falkenhainer, Brian


Cost-variability-sensitive preventive maintenance considering management risk  

Microsoft Academic Search

Traditional preventive maintenance policies, such as age replacement, periodic replacement under minimal repair, and replacement policy N, are all studied based on the expected cost criteria without considering the management risk due to the cost variability. As a result, these policies could be significantly beyond the anticipated maintenance budget allocation and lead to crisis. In order to solve this problem,




Strategy for biomedical equipment maintenance in developing countries  

Microsoft Academic Search

The author discusses a strategy for development of biomedical equipment repair and maintenance services in developing countries. An analysis of problems due to inadequate policy on manpower requirements, absence of a management system for maintenance, untrained operators, adverse environmental conditions, lack of spare parts and an erratic power supply, is presented

R. S. Khandpur



Equipment qualification maintenance  

SciTech Connect

Over the past few years, the nuclear power industry has devoted a great deal of attention to achieving equipment qualification. As this goal approaches, the attention of prudent utilities is now being directed toward maintaining that qualification throughout the useful life of the equipment. This paper presents a Qualification Maintenance Program (QMP), which is designed to meet the Nuclear Regulatory Commission requirements for ongoing qualification maintenance of safety-related equipment. This paper describes this program by answering the following four questions: What is QMP. Why is a QMP necessary. What are the benefits of a QMP. How can QMP best be achieved. Following the discussion of the above questions, an example is presented that illustrates a typical application of QMP in defining plant equipment maintenance requirements.

Scates, R.



Intravenous maintenance fluids revisited.  


Intravenous maintenance fluid therapy aims to replace daily urinary and insensible losses for ill children in whom adequate enteric administration of fluids is contraindicated or infeasible. The traditional determination of fluid volumes and composition dates back to Holliday and Segar's seminal article from 1957, which describes the relationship between weight, energy expenditure, and physiologic losses in healthy children. Combined with estimates of daily electrolyte requirements, this information supports the use of the hypotonic maintenance fluids that were widely used in pediatric medicine. However, using hypotonic intravenous fluids in a contemporary hospitalized patient who may have complex physiologic derangements, less caloric expenditure, decreased urinary output, and elevated antidiuretic hormone levels is often not optimal; evidence over the last 2 decades shows that it may lead to an increased incidence of hyponatremia. In this review, we present the evidence for using isotonic rather than hypotonic fluids as intravenous maintenance fluid. PMID:24196097

Cavari, Yuval; Pitfield, Alexander F; Kissoon, Niranjan



Maintenance of Certification®, Maintenance of Public Trust  

PubMed Central

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.

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



Application of the software maintenance predicate\\/transition net (smprt?net) to the change control process of maintenance  

Microsoft Academic Search

Software maintenance has its own life cycle and its own features. Software maintenance can occur due to changing user needs, to errors which must be fixed, and to a changing environment; and these, at a high level, can be described by an iterative three stage process, i.e., request control, change control and release control.Change control mainly involves the problem being

Stephen JennHwa Yang



A hybrid method combining the multitemporal resolution time-domain method of moments with the time-domain geometrical theory of diffraction for thin-wire antenna problems  

Microsoft Academic Search

In this paper, a hybrid method combining a multitemporal resolution (MTR) enhanced time-domain method of moments (TD-MoM) with the TD geometrical theory of diffraction (GTD) is presented, which allows to efficiently calculate the transient fields radiated by antennas in presence of large objects. The MTR scheme tailors the time step size-and thus implicitly the duration of the temporal basis function-on

Andreas Becker; Volkert Hansen



The taxonomic analysis of mass extinction intervals: An approach to problems of resolution as shown by Cretaceous ammonite genera (global) and species (Western Interior of the United States)  

Microsoft Academic Search

The application of diverse, yet basic, analytical metrics to high-resolution temporal and taxonomic data allows for precise documentation of ammonite origination, diversification, extinction, and turnover rates at the genus-substage and species-biozone level through mass extinction intervals. These dynamics are investigated for the entire Cretaceous for ammonites at the generic level, and during the highly dynamic Cenomanian-Turonian extinction interval at the

Christopher Collom


Remote Maintenance and Development of Home Automation Applications.  

National Technical Information Service (NTIS)

This work studies methods and technologies for remote maintenance and development of home automation applications. A major problem in remote home automation configuration seems to be the missing information concerning the properties and attributes of the ...

T. Aihkisalo



Logistics of Aircraft Maintenance During the Korean War.  

National Technical Information Service (NTIS)

The objectives of this research were to review historical literature relating to the logistics of aircraft maintenance during the Korean War; determine the principle problems encountered; find the corrective actions; and evaluate the results. The general ...

J. I. Forney



Industrial Mechanical Maintenance.  

ERIC Educational Resources Information Center

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…

Hendrix, Laborn J.


Maintenance Crisis vs Solutions.  

ERIC Educational Resources Information Center

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…

Haggard, Susie


Diesel Vehicle Maintenance Competencies.  

ERIC Educational Resources Information Center

Designed to provide a model set of competencies, this manual presents tasks which were identified by employers, employees, and teachers as important in a postsecondary diesel vehicle maintenance curriculum. The tasks are divided into seven major component areas of instruction: chassis and suspension, diesel engines, diesel fuel, electrical,…

Braswell, Robert; And Others


Horticulture: Grounds Maintenance Employee.  

ERIC Educational Resources Information Center

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…

Sims, James; And Others


Sewer Maintenance Manual.  

ERIC Educational Resources Information Center

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

Ontario Ministry of the Environment, Toronto.


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.



Equipment qualification maintenance  

Microsoft Academic Search

Over the past few years, the nuclear power industry has devoted a great deal of attention to achieving equipment qualification. As this goal approaches, the attention of prudent utilities is now being directed toward maintaining that qualification throughout the useful life of the equipment. This paper presents a Qualification Maintenance Program (QMP), which is designed to meet the Nuclear Regulatory




Maintenance: the specifier's influence  

Microsoft Academic Search

The paper sets out some points which specifiers may wish to consider when preparing new security system proposals. It recommends that specifiers consider the maintenance requirements of systems and that through life cost comparisons are made when making a choice from a number of potentially suitable options. Experience shows that the lowest capital cost option does not always give the

J. F. Howlett



Computerized Fleet Maintenance.  

ERIC Educational Resources Information Center

The computerization of school bus maintenance records by the Niskayuna (New York) Central School District enabled the district's transportation department to engage in management practices resulting in significant savings. The district obtains computer analyses of the work performed on all vehicles, including time spent, parts, labor, costs,…

Cataldo, John J.


Care and Maintenance.  

ERIC Educational Resources Information Center

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)

Hampton, Carol D.; Hampton, Carolyn H.



Electrical Maintenance Technician.  

ERIC Educational Resources Information Center

This document contains 30 units to consider for use in a tech prep competency profile for the occupation of electrical maintenance technician. All the units listed will not necessarily apply to every situation or tech prep consortium, nor will all the competencies within each unit be appropriate. Several units appear within each specific…

Ohio State Univ., Columbus. Center on Education and Training for Employment.


Total Productive Maintenance  

NSDL National Science Digital Library

Created by Kaye Krueger of Wisconsin Online Resource Center, this presentation allows user to read about how total productive maintenance can prevent breakdowns, defects, and a variety of other losses. This is a nice brief introduction to this important topic in manufacturing engineering.

Krueger, Kaye



Playground Inspection & Maintenance.  

ERIC Educational Resources Information Center

People today demand a safer work environment and a safer play environment for children. Accidents such as broken arms are no longer accepted as an inevitable part of growing up. This paper presents recommendations for the maintenance of safe playground areas and equipment, covering three main areas: (1) inspections, which should follow a specified…

Leeds, Gerard


Maintenance Workforce Characteristics.  

National Technical Information Service (NTIS)

We identified the characteristics of the FY01 DoD maintenance workforce, placing it in the larger context of the total DoD workforce and analyzing trends from FY97 to FY01. We evaluated the workforce in terms of age, years of service, retirement eligibili...

R. A. Clifford J. Callender N. T. O'Meara



Developpement de competences de resolution reflexive de problemes environnementaux aupres d'enseignants en formation du Botswana: Apport d'un modele pedagogique base sur une recherche-action participative  

NASA Astrophysics Data System (ADS)

Cette etude s'interesse au developpement de competences de resolution de problemes environnementaux dans un contexte culturel africain. Pour y parvenir, elle elabore un modele pedagogique pouvant se situer dans le cadre theorique de la vision reflexive emergeant presentement en education relative a l'environnement (ERE). Provenant du champ d'etude de la systemique, la methodologie des systemes souples (MSS) s'avere compatible avec le cadre de la reflexivite qui est emergent. Un modele pedagogique preliminaire fut ainsi etabli en transposant et en adaptant plusieurs des principes et des constituantes de la MSS au domaine de l'ERE. Ce modele, s'appuyant sur une strategie de recherche-action, a ete ensuite mis a l'essai aupres d'enseignants du secondaire en formation au Botswana, dans le cadre de leurs activites parascolaires. Cette recherche-developpement de type participatif s'appuie sur une analyse qualitative. Durant sa mise a l'essai, le modele preliminaire a subi plusieurs modifications generees entre autres par les interactions entre les participants et le facilitateur; ces modifications suggerent fortement une prise en charge par les participants de la demarche d'investigation, condition essentielle pour le developpement de competences de resolution de problemes environnementaux. Durant la demarche de resolution du probleme, des competences relatives a l'acquisition de connaissances sur la situation investiguee et a l'action environnementale ont ete sollicitees de maniere repetee. Ceci ne semble pas avoir ete le cas pour les competences associees a la reflexion par les participants sur leurs propres perceptions (metacognition), sur celles des autres ou encore sur la nature de la connaissance (cognition epistemique). En ce qui a trait a la conception de chaque apprenant concernant le probleme environnemental etudie, les observations recueillies tout au long de la demarche suggerent, pour certains des participants, une complexification. Le modele resultant de l'adaptation dans l'action par les participants presente ainsi un certain potentiel pour le developpement de plusieurs competences associees a la resolution de problemes environnementaux, et ce, dans un contexte transculturel. Cependant l'aspect reflexif associe a cette demarche demeure limite et demanderait a etre approfondi lors d'autres mises a l'essai.

Gauthier, Benoit



Resolution of an inverse heat conduction problem with a nonlinear least square method in the Hankel space. Application to photothermal infrared thermography  

NASA Astrophysics Data System (ADS)

Integral transforms (Laplace, Fourier, Hankel) are widely used to solve the heat diffusion equation. Moreover, it often appears relevant to realize the estimation of thermophysical properties in the transformed space. Here, an analytical model has been developed, leading to a well-posed inverse problem of parameter identification. Two black coatings, a thin black paint layer and an amorphous carbon film, were studied by photothermal infrared thermography. A Hankel transform has been applied on both thermal model and data and the estimation of thermal diffusivity has been achieved in the Hankel space. The inverse problem is formulated as a non-linear least square problem and a Gauss-Newton algorithm is used for the parameter identification.

Legaie, D.; Pron, H.; Bissieux, C.



Analysis of an APCA Baghouse Operation and Maintenance Survey  

Microsoft Academic Search

Baghouse operation and maintenance is probably the most serious problem area of fabric filter operations. Committee TC-1 (Particulates) of the Air Pollution Control Association recently surveyed baghouse installations in'the United States for the purpose of gathering information on operation and maintenance procedures and problems. One hundred thirty-three questionnaires were completed and returned. In this paper, the results of a comprehensive

Joseph P. Reynolds; Louis Theodore



Human factors in aircraft maintenance and inspection  

NASA Technical Reports Server (NTRS)

The events which have led to the intensive study of aircraft structural problems have contributed in no less measure to the study of human factors which influence aircraft maintenance and inspection. Initial research emphasis on aging aircraft maintenance and inspection has since broadened to include all aircraft types. Technicians must be equally adept at repairing old and new aircraft. Their skills must include the ability to repair sheet metal and composite materials; control cable and fly-by-wire systems; round dials and glass cockpits. Their work performance is heavily influenced by others such as designers, technical writers, job card authors, schedulers, and trainers. This paper describes the activities concerning aircraft and maintenance human factors.

Shepherd, William T.



Process Technology: Process Maintenance Engineer  

NSDL National Science Digital Library

In this video adapted from Pathways to Technology, youâÂÂll 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 machineâÂÂs 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.



Maritime and offshore structure maintenance  

SciTech Connect

This volume provides the most up-to date material available on methods of keeping maritime installations operational. It also draws out the exceptionally valuable expertise that has been gained from servicing the major installations in the North Sea and elsewhere in the world. Subjects cover maintenance and repair including a detailed analysis of structural maintenance on specific structures. Papers include expertise in North Sea structures, corrosion protection of a North Sea platform, maintenance of ports overseas, East Africa, low maintenance concrete and maintenance of steel offshore structures. Guidelines are also included for the inspection and maintenance of marine facilities and offshore installations.

Not Available



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

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…

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



Materialized View Maintenance and Integrity Constraint Checking: Trading Space for Time  

Microsoft Academic Search

We investigate the problem of incremental maintenance of an SQL view in the face of database updates, and show that it is possible to reduce the total time cost of view maintenance by materializing (and maintaining) additional views. We formulate the problem of determining the optimal set of additional views to materialize as an optimization problem over the space of

Kenneth A. Ross; Divesh Srivastava; S. Sudarshan



Automated crew procedure maintenance  

NASA Technical Reports Server (NTRS)

The preparation of 30 controlled documents for each flight of the Space Shuttle involves 90 people in processing 200 or 300 changes to existing checklists, and building new procedures. A prototype system is discussed which stores and displays those precise sets of instructions, which include rationale and change history, by using readily available hardware. It provides a simple method of structuring the data in a form for easy undertanding and maintenance.

Hollingshead, P.



Software Maintenance-Support System,  

National Technical Information Service (NTIS)

The article examines the maintenance operations associated with software production, defining their purpose, content, and principal concerns. After explaining the importance of software maintenance, the article introduces the functions, features, and prac...

T. Takami T. Ishii H. Horinouchi S. Fujioka T. Tobiyama



Improving Grassing Construction and Maintenance.  

National Technical Information Service (NTIS)

A grassing task force was assigned to take a completely objective look at grassing construction and maintenance using as guidelines the following priority order: (1) Reduce maintenance costs; (2) beautify roadsides; and (3) improve construction grassing. ...

E. L. Whittington P. B. Middlebrooks J. Wall



Handling complex anaphora resolution cases  

Microsoft Academic Search

The paper investigates difficult problems that could arise in anaphora resolution and proposes some solutions within the framework of a general anaphora resolution solver. Departing from the current research settings that deal with anaphora resolution on contiguous corpora, our investigation uses instead a collection of carefully hand chosen examples. The research is motivated by the belief that interpretation of free

Dan Cristea; Gabriela E. Dima; Oana-Diana Postolache; Ruslan Mitkov


C-17 integrated avionics maintenance  

Microsoft Academic Search

Application of the existing Integrated Maintenance Information System (IMIS) to the C-17 weapon system can provide significantly improved weapon system maintenance capability, which will result in reduced support system life-cycle costs. IMIS supplies maintenance technicians with direct access to maintenance information systems and databases, including historical data, supply data, technical manuals, and automated training systems. IMIS interrogates built-in test (BIT)

K. Cross; F. Sidhwa



Maintenance Decision Support System in Small and Medium Industries: An Approach to New Optimization Model  

Microsoft Academic Search

Summary Maintenance management is one of the main focuses in industrial sector. Many maintenance functions with varieties optimization models have been proposed to aid maintenance management. However, there are limited models have been implemented in small and medium industries (SMIs). The data problems and the gap between theory and practice have always become a reason. In this paper, a new

Zulkifli Tahir; Anton Satria Prabuwono; Hang Tuah Jaya



Maintenance Decision Support Fuzzy System in Small and Medium Industries Using Decision Making Grid  

Microsoft Academic Search

This paper describes maintenance decision support fuzzy system for computerized maintenance management system (CMMS) data analysis in small and medium industries (SMIs). The problems are based on two factors that influence effect of machines maintenance, the downtime and the frequency of machine failures. The objective is to implement both factors into decision making grid (DMG) and then embedded it into

Zulkifli Tahir; Anton Satria Prabuwono; M. A. Burhanuddin; Habibullah Akbar



Improving software maintenance through measurement  

NASA Technical Reports Server (NTRS)

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.

Rombach, H. Dieter; Ulery, Bradford T.




ERIC Educational Resources Information Center


Human Engineering Inst., Cleveland, OH.



ERIC Educational Resources Information Center


Honeywell, Inc., Minneapolis, Minn.


Improving Capital Productivity through Maintenance  

Microsoft Academic Search

Manufacturing companies are under pressure to minimize production costs. Reducing downtime and minimizing maintenance costs are the traditional approach. Improving production equipment effectiveness as prescribed in total productive maintenance (TPM) is a relatively recent development. Outlines improving maintenance productivity through structural audit and improving production equipment effectiveness for discrete type production systems and continuous processes. Suggests continuous improvement of production

A. Raouf



Anomaly Resolution in the International Space Station  

NASA Technical Reports Server (NTRS)

Topics include post flight 2A status, groundrules, anomaly resolution, Early Communications Subsystem anomaly and resolution, Logistics and Maintenance plan, case for obscuration, case for electrical short, and manual fault isolation, and post mission analysis. Photographs from flight 2A.1 are used to illustrate anomalies.

Evans, William A.



An agent-based platform for service integration in e-maintenance  

Microsoft Academic Search

The evolution of industrial systems makes the maintenance tasks more and more important. Encouraged by the requirements of industrial companies, we provide a solution to the problems of both industrial maintenance and enterprise integration by integrating industrial systems and field devices. With agent, Web and other technologies, e-maintenance and e-enterprise are becoming possible. E-maintenance is considered as one example of

Wei Zhang; Wolfgang Halang; Christian Diedrich



Power transformer maintenance and testing  

SciTech Connect

Transformer maintenance is a key element in establishing reliability and continuity of electric service in every industrial facility. The proper practices, schedules and procedures, customized by experience with each transformer application, will insure that unscheduled outages and equipment replacement are minimized. Preventive and predictive techniques are effective in the maintenance process. There are limitations and there can be difficulties in diagnosing the data. Even so, the maintenance process must be taken seriously. The philosophies and information presented in this article are intended to make the user of power transformers aware of the nature of the equipment and the importance of proper maintenance. While on-line monitoring is relatively new to the industry, electric utility experience with the equipment is expanding. Confidence levels are increasing with the approach to maintenance. Research and existing equipment improvements are ongoing. The future for predictive maintenance to enhance transformer reliability and, at the same time, save maintenance dollars is very promising.

Wiefling, R.R.; Lubinski, J.R. [ABB Power T and D Co., Inc., Alamo, TN (United States); Chastney, D.J. [ABB Service Inc., Pittsburgh, PA (United States)



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


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

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



Maintenance of neuronal polarity.  


Neurons are highly polarized cells with distinct domains responsible for receiving, transmitting, and propagating electrical signals. Central to these functions is the axon initial segment (AIS), a short region of the axon adjacent to the cell body that is enriched in voltage-gated ion channels, cell adhesion molecules, and cytoskeletal scaffolding proteins. Traditionally, the function of the AIS has been limited to its role in action potential initiation and modulation. However, recent experiments indicate that it also plays essential roles in neuronal polarity. Here, we review how initial segments are assembled, and discuss proposed mechanisms for how the AIS contributes to maintenance of neuronal polarity. PMID:21557501

Szu-Yu Ho, Tammy; Rasband, Matthew N



Paranal maintenance and CMMS experience  

NASA Astrophysics Data System (ADS)

During the last four years of operations, low technical downtime has been one of the relevant records of the Paranal Observatory. From the beginning of the Very Large Telescope (VLT) project, European Southern Observatory (ESO) has considered the implementation of a proper maintenance strategy a fundamental point in order to ensure low technical down time and preserve the Observatory's assets. The implementation of the maintenance strategy was based on the following aspects: - Strong maintenance sense during the design stage. Line Replacement Unit (LRU) concept, standardization and modularity of the Observatory equipment - Creation of a dedicated team for Maintenance - The implementation of a Computerized Maintenance Management System After four operational years, the result of these aspects has exceeded the expectations; the Observatory has been operating with high availability under a sustainable strategy. The strengths of the maintenance strategy have been based on modern maintenance concepts applied by regular production companies, where any minute of down time involves high cost. The operation of the actual Paranal Maintenance System is based mainly on proactive activities, such as regular inspections, preventive maintenance (PM) and predictive maintenance (PdM) plans. Nevertheless, it has been necessary to implement a strong plan for corrective maintenance (CM). The Spare Parts Strategy has also been an important point linked to the Maintenance Strategy and CMMS implementation. At present, almost 4,000 items related to the Observatory spare parts are loaded into the CMMS database. Currently, we are studying the implementation of a Reliability Centered Maintenance (RCM) project in one of our critical systems The following document presents the actual status of the Paranal Maintenance Strategy and which have been the motivations to implement the established strategy.

Montano, Nelson



Investigation of Design, Maintenance and Operating Procedures of Wheelchair Lifts on Transit Buses: Final Report Phase 3.  

National Technical Information Service (NTIS)

The report describes the findings of a project conducted to investigate the design, operation, and maintenance aspects of wheelchair lifts. The project objective is to assess the nature of problems pertaining to design, manufacture, operation, and mainten...

H. Aktan S. Khasnabis J. Pandya



Maintenance and supply options  

NASA Technical Reports Server (NTRS)

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.



Remote maintenance monitoring system  

NASA Technical Reports Server (NTRS)

A remote maintenance monitoring system retrofits to a given hardware device with a sensor implant which gathers and captures failure data from the hardware device, without interfering with its operation. Failure data is continuously obtained from predetermined critical points within the hardware device, and is analyzed with a diagnostic expert system, which isolates failure origin to a particular component within the hardware device. For example, monitoring of a computer-based device may include monitoring of parity error data therefrom, as well as monitoring power supply fluctuations therein, so that parity error and power supply anomaly data may be used to trace the failure origin to a particular plane or power supply within the computer-based device. A plurality of sensor implants may be rerofit to corresponding plural devices comprising a distributed large-scale system. Transparent interface of the sensors to the devices precludes operative interference with the distributed network. Retrofit capability of the sensors permits monitoring of even older devices having no built-in testing technology. Continuous real time monitoring of a distributed network of such devices, coupled with diagnostic expert system analysis thereof, permits capture and analysis of even intermittent failures, thereby facilitating maintenance of the monitored large-scale system.

Simpkins, Lorenz G. (Inventor); Owens, Richard C. (Inventor); Rochette, Donn A. (Inventor)



Knowledge-Based Validity Maintenance for Production Systems  

Microsoft Academic Search

In many problem domains, an action may be taken by an expert, which, due to new inferences or a changing domain situation, should be retracted. To this end, an effective problem solver will need to use some kind of validity-maintenance system, so that it can gracefully recover from invalid previous decisions. Unfortunately, the standard IF\\/THEN paradigm often used to encode

Philip Schaefer; H. Isil Bozma; Randall D. Beer



Performance Contracting: Meeting the Challenge of Deferred Maintenance.  

ERIC Educational Resources Information Center

Discusses the magnitude of the problem of deferred maintenance on today's university campuses and the solving this problem using performance-based energy efficiency retrofit as implemented by energy service companies (ESCO). Several case studies of ESCO designed retrofits are examined. (GR)

Singer, Terry E.; Johnson, Mary E.



A risk-sensitive approach to total productive maintenance  

Microsoft Academic Search

While risk-sensitive (RS) approaches for designing plans of total productive maintenance are critical in manufacturing systems, there is little in the literature by way of theoretical modeling. Developing such plans often requires the solution of a discrete-time stochastic control- optimization problem. Renewal theory and Markov decision processes (MDPs) are commonly employed tools for solving the underlying problem. The literature on

Abhijit Gosavi



Revision of certification standards for aviation maintenance personnel  

NASA Technical Reports Server (NTRS)

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.

Vipond, Leslie K.



TCMS operations and maintenance philosophy  

NASA Technical Reports Server (NTRS)

The purpose is to describe the basic philosophies of operating and maintaining the Test, Control, and Monitor System (TCMS) equipment. TCMS is a complex and sophisticated checkout system. Operations and maintenance processes developed to support it will be based upon current experience, but will be focused on the specific needs of TCMS in support of Space Station Freedom Program (SSFP) and related activities. An overview of the operations and maintenance goals and philosophies are presented. The assumptions, roles and responsibilities, concepts and interfaces for operation, on-line maintenance, off-line support, and Operations and Maintenance (O&M) personnel training on all TCMS equipment located at KSC are described.

Buehler, David P.; Griffin, Rock E.



Evaluating mean-time-to-failure and maintenance costs for shell-and-tube heat exchangers  

Microsoft Academic Search

The oil and gas industry in Algeria and other developing countries is encountering numerous problems, resulting in lowered equipment productivity and performance. These problems are related directly to improper maintenance or a lack of maintenance, which shortens the operating time of shell-and-tube heat exchangers in particular and necessitates frequent and costly repairs. The difficulties being experienced in calculating the parameters

S. Auashria; O. I. Steklov



Resolution Matters  

NSDL National Science Digital Library

This is an activity about image resolution. Learners will recreate a solar image taken by the Solar Dynamics Observatory (SDO) using various sizes of building bricks, and discuss how their recreations relate to image resolution. Learners will also compare SDO images to solar images from older spacecraft to see how improved technology helps scientists learn more about the Sun.


Illinois Occupational Skill Standards: Industrial Maintenance General Maintenance Cluster.  

ERIC Educational Resources Information Center

These skill standards for the industrial maintenance general maintenance cluster are intended to be a guide to workforce preparation program providers in defining content for their programs and to employers to establish the skills and standards necessary for job acquisition. An introduction provides the Illinois perspective; Illinois Occupational…

Illinois Occupational Skill Standards and Credentialing Council, Carbondale.


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