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Relevant bibliographies by topics / Minimal replacement

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Academic literature on the topic 'Minimal replacement'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Minimal replacement"

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Rajakaruna, Chanaka, Gerry Webb, Mark Bennett, and Clinton Lloyd. "Minimal access aortic valve replacement using minimal extracorporeal circuit." Asian Cardiovascular and Thoracic Annals 20, no. 3 (2012): 358–60. http://dx.doi.org/10.1177/0218492312440891.

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Yilmaz, Alaadin, Atiq Rehman, Uday Sonker, and Geoffrey T. L. Kloppenburg. "Minimal Access Aortic Valve Replacement Using a Minimal Extracorporeal Circulatory System." Annals of Thoracic Surgery 87, no. 3 (2009): 720–25. http://dx.doi.org/10.1016/j.athoracsur.2008.12.016.

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Bagai, I., and K. Jain. "Improvement, deterioration, and optimal replacement under age-replacement with minimal repair." IEEE Transactions on Reliability 43, no. 1 (1994): 156–62. http://dx.doi.org/10.1109/24.285130.

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Jack, Nat. "Costing a Finite Minimal Repair Replacement Policy." Journal of the Operational Research Society 43, no. 3 (1992): 271. http://dx.doi.org/10.2307/2583717.

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Robu, M., Aura Mazâlu, Celia Ciobanu, C. Voica, L. Dorobanțu, and H. Moldovan. "MINIMAL INVASIVE AORTIC VALVE REPLACEMENT – CLINICAL STUDY." Journal of Surgical Sciences 1, no. 3 (2018): 109–11. http://dx.doi.org/10.33695/jss.v1i3.184.

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The revolution of minimally invasive techniques from the last two decades lead to minimally invasive aortic valve replacement. Minimal “J” shaped sternotomy extended in to the 4 intercostal space provides good access to the aortic root and the possibility to connect the patient to the extracorporeal circulation machine without the use of new instruments. We present a 69-year-old patient that presents in to our clinic with degenerative aortic valve disease with severe stenosis and mild regurgitation. Minimally invasive aortic valve replacement was performed with success in our clinic, being a safe and efficient procedure. This technique could become the standard procedure for isolated aortic valve replacement, with substantial benefits regarding respiratory function.

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Jack, Nat. "Costing a Finite Minimal Repair Replacement Policy." Journal of the Operational Research Society 43, no. 3 (1992): 271–75. http://dx.doi.org/10.1057/jors.1992.36.

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Paillard, P. "Hip replacement by a minimal anterior approach." International Orthopaedics 31, S1 (2007): 13–15. http://dx.doi.org/10.1007/s00264-007-0433-7.

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Park, Y. T., and Kyung S. Park. "Optimal stocking for replacement with minimal repair." Microelectronics Reliability 25, no. 1 (1985): 147–55. http://dx.doi.org/10.1016/0026-2714(85)90454-8.

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Kijima, Masaaki, Hidenori Morimura, and Yasusuke Suzuki. "Periodical replacement problem without assuming minimal repair." European Journal of Operational Research 37, no. 2 (1988): 194–203. http://dx.doi.org/10.1016/0377-2217(88)90329-3.

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Sheu, Shey-Huei. "A Generalized Age Replacement Model in the Presence of Inventory Constraints." International Journal of Reliability, Quality and Safety Engineering 04, no. 04 (1997): 395–412. http://dx.doi.org/10.1142/s0218539397000291.

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Many authors in the literature have studied the age replacement problem and its various modifications. One, generally, is asked to assume that at any time there is an unlimited supply of items available for replacement. This is often not a very realistic assumption. In this article we will examine a generalized age replacement model with age-dependent minimal repair when replacements are constrained by two simple inventory model. Various special cases are included. A numerical example is given to illustrate the method.

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Dissertations / Theses on the topic "Minimal replacement"

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CLERICI, ALBERTO. "Development of a novel technology platform for thoracoscopic aortic valve replacement." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2745352.

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Parsa, Maryam. "Optimum Decision Policy for Gradual Replacement of Conventional Power Sources by Clean Power Sources." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24015.

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With the increase of world population and industrial growth of developing countries, demand for energy, in particular electric power, has gone up at an unprecedented rate over the last decades. To meet the demand, electric power generation by use of fossil fuel has increased enormously thereby producing increased quantity of greenhouse gases. This contributes more and more to atmospheric pollution, which climate scientists believe can adversly affect the global climate, as well as health and the welfare of the world population. In view of these issues, there is global awareness to look for alternate sources of energy such as natural gas, hydropower, wind, solar, geothermal and biomass. It is recognized that this requires replacement of existing infrastructure with new systems, which cannot be achieved overnight. Optimal control theory has been widely used in diverse areas of physical sciences, medicine, engineering and economics. The main motivation of this thesis is to use this theory to find the optimum strategy for integration of all currently available renewable energy sources with the existing electric power generating systems. The ultimate goal is to eliminate fossil fuels. Eight main energy sources namely, Coal, Petroleum, Natural Gas, Conventional Hydro, Wind, Solar, Geothermal and Biomass are considered in a dynamic model. The state of the dynamic model represents the level of energy generation from each of the sources. Different objective functions are proposed in this thesis. These range from meeting the desired target level of power generation from each of the available sources at the end of a given plan period, to reducing the implementation and investment costs; from minimizing the production from polluted energy sources to meeting the electricity demand during a whole plan period. Official released data from the U.S. Energy Information Administration have been used as a case study. Based on real life data and the mathematics of optimal control theory, we present an optimal policy for integration of renewable energy sources to the national power grid.

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Alkhalil, Ahmad. "Outcomes Of Early Versus Late Discharge In Transfemoral Transcatheter Aortic Valve Replacement Via Minimally Invasive Strategy: A Propensity-Matched Analysis." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1465592493.

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Sell, Andres. "Determining the minimum local anaesthetic requirements for hip replacement surgery under spinal anaesthesis : a study employing a spinal catheter /." Online version, 2005. http://dspace.utlib.ee/dspace/bitstream/10062/1081/5/sell.pdf.

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Shehada, Sharaf-Eldin Ibrahim Hassan [Verfasser], Bernhard J. [Akademischer Betreuer] Voss, and Rüdiger [Akademischer Betreuer] Lange. "Propensity Score Analysis of Outcomes following Minimally Invasive versus Conventional Aortic Valve Replacement / Sharaf-Eldin Ibrahim Hassan Shehada. Gutachter: Bernhard J. Voss ; Rüdiger Lange. Betreuer: Bernhard J. Voss." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1069621714/34.

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Lok, Peter Yin Cheung. "Development of a novel minimally invasive scaffold system for spinal disc repair." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12583.

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Debilitating chronic back pain caused by severe spinal disc degeneration leads to loss of mobility, affecting quality of life, a significant loss of productivity for the employee and the employer. Currently available surgical intervention options, such as spinal fusion and total disc replacement, seeking only to alleviate pain, are not only invasive, but fail to address the underlying biological causes of spinal disc degeneration, or restore normal physiological spinal motion. Recently proposed tissue engineering approaches focus on stopping and reversing the degenerative cascade, which has a promising regenerative effect, though not without significant challenges before a clinical application is made available, including tumourigenesis risks and proof of efficacy. A minimally invasive nucleus pulposus replacement option, which preserves the competent annulus fibrosis, while replacing the removed degenerated nucleus tissue with a prosthesis, provides an alternative for early disc degeneration, though most commercially available types are at clinical trial stages. There is an opportunity for developing a minimally invasive nucleus pulposus replacement type spinal implant system that restores disc biomechanics and addresses biological degenerative causes. This body of work details the design, development, fabrication, prototyping, verification and validation of this novel implant system. The implant system consisted of a configuration of scaffold and hydrogel interpenetrating polymer network composite delivered minimally invasively via a cannula system, after the nucleus pulposus is removed in a nucleotomy with a set of specialised tools. Implantation of the novel prosthesis was shown to be successful in various spinal disc models, in meeting identified design and functional requirements, including biomechanical loading, resistance to expulsion and radiopacity.

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Vicente, José Ricardo Negreiros. "Estudo comparativo entre a via de acesso minimamente invasiva posterior e a via de acesso lateral direta nas artroplastias totais do quadril não cimentadas." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-13022008-080950/.

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Um estudo terapêutico comparativo prospectivo é realizado para avaliar o acesso posterior minimamente invasivo em artroplastia total do quadril comparado com o acesso lateral direto tradicional. O estudo inclui 76 pacientes submetidos à artroplastia total do quadril primárias não cimentadas por diagnóstico de osteoartrose primária e secundária. Não são incluídos, pacientes com qualquer tipo de coagulopatia, em uso de anticoagulantes ou antiagregante plaquetário, pacientes hipertensos sem controle medicamentoso, pacientes submetidos à qualquer cirurgia prévia do quadril, e pacientes com seqüela de displasia do desenvolvimento do quadril que tenham a cabeça femoral ectópica. O objetivo principal deste estudo é avaliar a perda volêmica que ocorre nestes pacientes. Há diferença de média de idade (p=0,017) no acesso minimamente invasivo (50,1 anos) em relação ao grupo controle (56,8 anos), porém não observamos diferenças entre os grupos quanto ao índice de massa corpórea, lado operado e diagnóstico inicial. Observa-se um sangramento menor (p<0,001) no período intra-operatório (745,6 ml contra 1282,8 ml), assim como, menor sangramento total (p<0,001) no acesso minimamente invasivo posterior (1083,5 ml contra 1682,3 ml). Relatamos diferença entre os grupos quanto à necessidade de transfusão alogênica, favorável aos pacientes do grupo minimamente invasivo (p=0,02), com 8,8% dos pacientes sendo transfundidos em relação a 28,6% dos pacientes do grupo controle. Nossa estimativa de sangramento no acesso minimamente invasivo posterior é significativamente maior que a literatura, porém a quantidade de unidades de concentrados de hemáceas transfundidas,assim como, a proporção de pacientes transfundidos são menores em relação aos outros autores. Concluímos que os pacientes submetidos ao acesso minimamente invasivo posterior apresentam menor sangramento, melhor resultado clínico precoce e posicionamento adequado dos componentes da prótese.<br>A therapeutic, comparative, prospective study was carried out to evaluate the minimally invasive posterior approach to total hip arthroplasty in relation to the traditional direct lateral approach. The study included 76 cases of primary total hip arthroplasty due to a diagnosis of primary or secondary osteoarthrosis. Patients were excluded from the study if they presented any type of coagulopathy and were using anticoagulants or platelet antiagregants; hypertension without medicinal control; any previous hip surgery; and sequelae of hip developmental dysplasia that might have led to an ectopic femoral head. The objective of our study was to evaluate the blood loss among patients for whom the minimally invasive posterior access is used. Regarding our patients\' ages, we observed a significant difference between the two groups: the mean age of the mini-incision group (50,1 years) was lower than the mean of the control group (56,8 years), p= 0.01. Lower total estimated bleeding was found in the mini-incision group (means of 1083,5 ml versus 1682,3 ml; p < 0.001) and lower intraoperative bleeding (means of 745,6 ml versus 1282,8 ml; p <0.001). There was difference in the need of allogenic transfusion between the two groups (8,8% versus 28,6%,p = 0.13). Our volumes of bleeding from the minimally invasive posterior approach were significantly higher than in the literature, but the mean quantity of transfused red cells and the proportion of transfused patients were both significantly lower than in the literature. Our final impression of the minimally invasive approach is positive with regard to lower blood loss, better clinical results after six months and a satisfactory alignment of the acetabular and femoral components.

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Nourbakhsh, Ghavameddin. "Reliability analysis and economic equipment replacement appraisal for substation and sub-transmission systems with explicit inclusion of non-repairable failures." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/40848/1/Ghavameddin_Nourbakhsh_Thesis.pdf.

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The modern society has come to expect the electrical energy on demand, while many of the facilities in power systems are aging beyond repair and maintenance. The risk of failure is increasing with the aging equipments and can pose serious consequences for continuity of electricity supply. As the equipments used in high voltage power networks are very expensive, economically it may not be feasible to purchase and store spares in a warehouse for extended periods of time. On the other hand, there is normally a significant time before receiving equipment once it is ordered. This situation has created a considerable interest in the evaluation and application of probability methods for aging plant and provisions of spares in bulk supply networks, and can be of particular importance for substations. Quantitative adequacy assessment of substation and sub-transmission power systems is generally done using a contingency enumeration approach which includes the evaluation of contingencies, classification of the contingencies based on selected failure criteria. The problem is very complex because of the need to include detailed modelling and operation of substation and sub-transmission equipment using network flow evaluation and to consider multiple levels of component failures. In this thesis a new model associated with aging equipment is developed to combine the standard tools of random failures, as well as specific model for aging failures. This technique is applied in this thesis to include and examine the impact of aging equipments on system reliability of bulk supply loads and consumers in distribution network for defined range of planning years. The power system risk indices depend on many factors such as the actual physical network configuration and operation, aging conditions of the equipment, and the relevant constraints. The impact and importance of equipment reliability on power system risk indices in a network with aging facilities contains valuable information for utilities to better understand network performance and the weak links in the system. In this thesis, algorithms are developed to measure the contribution of individual equipment to the power system risk indices, as part of the novel risk analysis tool. A new cost worth approach was developed in this thesis that can make an early decision in planning for replacement activities concerning non-repairable aging components, in order to maintain a system reliability performance which economically is acceptable. The concepts, techniques and procedures developed in this thesis are illustrated numerically using published test systems. It is believed that the methods and approaches presented, substantially improve the accuracy of risk predictions by explicit consideration of the effect of equipment entering a period of increased risk of a non-repairable failure.

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Ericson, Petter. "Complexity and expressiveness for formal structures in Natural Language Processing." Licentiate thesis, Umeå universitet, Institutionen för datavetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135014.

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The formalized and algorithmic study of human language within the field of Natural Language Processing (NLP) has motivated much theoretical work in the related field of formal languages, in particular the subfields of grammar and automata theory. Motivated and informed by NLP, the papers in this thesis explore the connections between expressibility – that is, the ability for a formal system to define complex sets of objects – and algorithmic complexity – that is, the varying amount of effort required to analyse and utilise such systems. Our research studies formal systems working not just on strings, but on more complex structures such as trees and graphs, in particular syntax trees and semantic graphs. The field of mildly context-sensitive languages concerns attempts to find a useful class of formal languages between the context-free and context-sensitive. We study formalisms defining two candidates for this class; tree-adjoining languages and the languages defined by linear context-free rewriting systems. For the former, we specifically investigate the tree languages, and define a subclass and tree automaton with linear parsing complexity. For the latter, we use the framework of parameterized complexity theory to investigate more deeply the related parsing problems, as well as the connections between various formalisms defining the class. The field of semantic modelling aims towards formally and accurately modelling not only the syntax of natural language statements, but also the meaning. In particular, recent work in semantic graphs motivates our study of graph grammars and graph parsing. To the best of our knowledge, the formalism presented in Paper III of this thesis is the first graph grammar where the uniform parsing problem has polynomial parsing complexity, even for input graphs of unbounded node degree.

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Mohlala, Tshwari Phineas. "Repair cost-limit replacement policies with minimal repairs." Thesis, 2008. http://hdl.handle.net/10539/5075.

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This dissertation examines a number of maintenance models that are implemented to reduce incidences of system failures or to return a failed system to the operating state. In particular, the repair cost-limit (RCL) replacement models are investigated. On failure the system is replaced by an equivalent new one if the random repair costs C exceeds a given repair cost limit c , or at age t by a preventive replacement if in the time interval #1;0,t #2; no failure induced a replacement of the system. Otherwise, after failure a minimal repair is carried out. After any replacement, the time is returned to zero. For instance, in everyday life, one has to make such decisions once in a while: repair or replace a car, a television set or a refrigerator, depending on the cost of a repair. If the cost of repair is high, then it is more economical to replace the item by a new one. This dissertation considers the combination of the RCL replacement policy with the age replacement policy. An expression for the expected long run cost per unit time (maintenance cost rate) is derived. The optimum values of c and t are obtained.

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Books on the topic "Minimal replacement"

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Tadj, Lotfi, M. Salah Ouali, Soumaya Yacout, and Daoud Ait-Kadi, eds. Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5.

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Tadj, Lotfi. Replacement Models with Minimal Repair. Springer-Verlag London Limited, 2011.

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Hip arthroplasty: Minimally invasive techniques and computer navigation. Elsevier/Saunders, 2006.

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Tadj, Lotfi, Soumaya Yacout, and M. Salah Ouali. Replacement Models with Minimal Repair. Springer, 2011.

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Tadj, Lotfi, Soumaya Yacout, Daoud Ait-Kadi, and M. Salah Ouali. Replacement Models with Minimal Repair. Springer, 2013.

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Karttunen, Lauri. Finite-State Technology. Edited by Ruslan Mitkov. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199276349.013.0018.

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The article introduces the basic concepts of finite-state language processing: regular languages and relations, finite-state automata, and regular expressions. Many basic steps in language processing, ranging from tokenization, to phonological and morphological analysis, disambiguation, spelling correction, and shallow parsing, can be performed efficiently by means of finite-state transducers. The article discusses examples of finite-state languages and relations. Finite-state networks can represent only a subset of all possible languages and relations; that is, only some languages are finite-state languages. Furthermore, this article introduces two types of complex regular expressions that have many linguistic applications, restriction and replacement. Finally, the article discusses the properties of finite-state automata. The three important properties of networks are: that they are epsilon free, deterministic, and minimal. If a network encodes a regular language and if it is epsilon free, deterministic, and minimal, the network is guaranteed to be the best encoding for that language.

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Zhang, Weiya, and Michael Doherty. Guidelines. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199668847.003.0037.

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A number of treatment guidelines have been developed to optimize the treatment of osteoarthritis, some of which were recently updated. Fifty-one non-pharmacological, pharmacological, and surgical treatments are addressed in these guidelines but only two (oral opioid and intra-articular steroid injection) reach the minimal clinically important difference above placebo. Recommendations for these treatments vary depending on joint sites, risk:benefit ratio, and population. Exercise, self-management, and weight reduction if obese are universally recommended. While topical non-steroidal anti-inflammatory drugs (NSAIDs) remain a safe first-line drug option, the safety of paracetamol, the universally recommended first-line oral analgesic is increasingly questioned. Other analgesics such as oral NSAIDs (including selective cyclooxygenase 2 inhibitors), opioids, and antidepressants should be used according to patient characteristics and comorbidities. Nutraceuticals and complementary medicines remain controversial. While lavage is not recommended, total joint replacement is still considered as an effective treatment for the later stage of the disease irrespective of lack of placebo (sham) controlled trials. Stratified care has been attempted for recommendation according to joint affected and comorbidities but there is no evidence to support whether this can improve treatment outcomes. Guideline development groups differ in their composition and methodology. While the overall quality of guidelines has been improved, their applicability remains poor. Of the various factors that may influence implementation, suboptimal publishing and the efficacy paradox need to be recognized as important barriers.

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Dorr, Lawrence D. Hip Arthroplasty: Minimally Invasive Techniques and Computer Navigation, Text with DVD-ROMS. Saunders, 2005.

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Scuderi, Giles R., and Alfred J. Jr Tria. MIS of the Hip and the Knee: A Clinical Perspective. Springer, 2013.

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Tria, Alfred J. , Jr., Jr. and Giles R. Scuderi. MIS of the Hip and the Knee: A Clinical Perspective. Springer London, Limited, 2006.

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Book chapters on the topic "Minimal replacement"

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Mizutani, Satoshi, Xufeng Zhao, and Toshio Nakagawa. "Replacement Model with Minimal Repair." In Springer Series in Reliability Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27316-2_3.

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Ouali, Mohamed-Salah, Lotfi Tadj, Soumaya Yacout, and Daoud Ait-Kadi. "A Survey of Replacement Models with Minimal Repair." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_1.

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Aven, Terje. "Information-Based Minimal Repair Models information-based model." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_2.

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Castro, Inma T. "Minimal Repair Models with Two Categories of Competing Failure Modes." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_3.

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Wu, Shaomin. "Preventive Maintenance Models: A Review." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_4.

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Kim, Dohoon, Jae-Hak Lim, and Ming J. Zuo. "Optimal Schedules of Two Periodic Imperfect Preventive Maintenance Policies and Their Comparison." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_5.

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Iskandar, Bermawi P., and Nat Jack. "Warranty Servicing with Imperfect Repair for Products Sold with a Two-Dimensional Warranty." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_6.

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Cha, Ji Hwan. "A Survey of Burn-in and Maintenance Models for Repairable Systems." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_7.

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Aggoun, Lakhdar, and Lotfi Tadj. "Filtering and M-ary Detection in a Minimal Repair Maintenance Model." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_8.

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Ghodrati, Behzad. "Efficient Product Support—Optimum and Realistic Spare Parts Forecasting." In Replacement Models with Minimal Repair. Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-215-5_9.

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Conference papers on the topic "Minimal replacement"

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"Semi-Markov model of replacement system with minimal repair." In Engineering Mechanics 2018. Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2018. http://dx.doi.org/10.21495/91-8-585.

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Li, Keqiu, Takashi Nanya, and Wenyu Qu. "A Minimal Access Cost-Based Multimedia Object Replacement Algorithm." In 2007 IEEE International Parallel and Distributed Processing Symposium. IEEE, 2007. http://dx.doi.org/10.1109/ipdps.2007.370465.

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Mohamed-Larbi, Rebaiaia, and Ait-Kadi Daoud. "An Optimum Comparative Analysis for Minimal Repair and Replacement on Failures." In 2019 International Conference on Industrial Engineering and Systems Management (IESM). IEEE, 2019. http://dx.doi.org/10.1109/iesm45758.2019.8948140.

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Meng, Niculin, and Simon Hoffmann. "Expansion Joint Replacement with Minimal Impacts on the Bridge Structure and on Traffic." In IABSE Conference, Copenhagen 2018: Engineering the Past, to Meet the Needs of the Future. International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/copenhagen.2018.186.

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Bridge expansion joints are key structural components that are subjected to very demanding dynamic loading. Even though modern expansion joints are being continuously developed and improved, they are generally still much less robust and less durable than the main structure. Therefore, replacement of expansion joints is commonly required in the maintenance of our transportation infrastructure. In carrying out such replacement work, the impacts on traffic and on the bridge’s superstructure should be minimised, for economic and sustainability reasons. This paper presents various expansion joint replacement methods which minimise such impacts, for a wide range of scenarios and movement requirements. The methods described cover single gap joints, sliding finger joints and modular joints – which, where appropriate, retain and use elements of suitably designed existing joints, thus optimising the replacement process in various respects.

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Chen, J. A., and Y. H. Chien. "Optimal spare ordering policy for preventive replacement with age-dependent minimal repair under cost effectiveness criterion." In 2007 IEEE International Conference on Industrial Engineering and Engineering Management. IEEE, 2007. http://dx.doi.org/10.1109/ieem.2007.4419265.

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Mingchih Chen and Chun-Yuan Cheng. "Sensitivity analysis for the optimal minimal repair/replacement policies under the framework of markov decision process." In 2007 IEEE International Conference on Industrial Engineering and Engineering Management. IEEE, 2007. http://dx.doi.org/10.1109/ieem.2007.4419268.

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Chien, Y. H., and J. A. Chen. "Optimal age-replacement model with minimal repair based on cumulative repair cost limit and random lead time." In 2007 IEEE International Conference on Industrial Engineering and Engineering Management. IEEE, 2007. http://dx.doi.org/10.1109/ieem.2007.4419267.

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SAUVÉ, JAMES A., and KEVIN M. JAANSALU. "TOWARDS A DROP-IN REPLACEMENT SUBSONIC CAPABILITY FOR NATO SMALL ARMS." In 32ND INTERNATIONAL SYMPOSIUM ON BALLISTICS. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/ballistics22/36094.

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While subsonic ammunition has been of military interest for years, particularly for covert operations, significant limitations of current offerings have prevented its adoption including the inability to cycle an automatic action. This and other limitations were investigated through a design exercise to establish the feasibility of a drop-in replacement relevant to the Canadian Armed Forces using commercial off the shelf components. A survey and stability analysis of commercially available 5.56 mm projectiles led to the selection of the 90 grain Sierra Matchking for this design. Three different cartridge configurations were investigated in order to evaluate the effect of reducing cartridge volume on key internal ballistic variables. A cycling impulse model was developed in order to rank candidate designs on their ability to cycle a prescribed automatic weapon. Cartridge volume, in terms of standard cartridge, straight internal bore, and custom internal diameter to realize 95% load density, was explored as a means of increasing the load density of subsonic ammunition in order to reduce muzzle velocity variance and thus increase accuracy. However, the accuracy gained by reducing cartridge volume is shown to cause significant tradeoffs in cycling impulse. Live fire testing was performed in order to determine the minimum cycling impulse required to cycle the test weapon. The results also indicate that there may exist a threshold load density above which load density does not play a significant role in muzzle velocity variance. Thus, an objective of maximizing load density may overconstrain the design for minimal benefit.

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Meyer, Robert, Marcin Bulkowski, and Peter Bomba. "Replacement of the Schwelmetal Viaduct in Germany – Use of BIM." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1836.

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<p>The Schwelmetal Viaduct is part of the federal highway A1 near Wuppertal, Germany. It spans over a major railway line, another federal and local road, as well as the Schwelme River. The scope includes the demolition of the existing 207 m long viaduct built in the 1960s while all traffic on and below the bridge must keep flowing. Moreover, the highly confined space allows for minimal tolerances and basically no extra construction space.</p><p>A very elaborate demolition and erection scheme has been developed to minimize traffic interruption. BIM has been chosen as planning tool to make sure the strict geometric restraints are not violated and a safe construction can be ensured. The whole design and construction process is BIM supported - including the use of BIM for all progress meetings with the client DEGES. This is the first time BIM is used for the construction of a major highway bridge in Germany.</p><p>This paper describes the developed demolition and erection sequence and shows the practical issues arising when using BIM as a planning tool and how the process can be optimized in the future.</p>

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Lam, Tony C. T., Thomas H. McCloskey, Robert P. Dewey, and Paul Wawrzynek. "Assessment of Remaining Life of a Control Stage Blade With Solid Particle Erosion Damage." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-241.

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Unscheduled replacement of HP control stage blades due to solid particle erosion can be avoided if the structural integrity of the eroded blade has not been compromised, and the risk of an in-service failure is shown to be minimal. An analytical approach is presented which was used to evaluate whether blades with SPE damage could remain in service until the next convenient outage, in order to provide the plant engineers with specifications to assist them in determining the need for replacement based on further observed erosion damage. A three-dimensional fracture mechanics model was applied to study the propagation of cracks caused by erosion, and to assess when rupture was likely to occur. The results of the study are presented as a model for plant operators to use in scheduling the repair or replacement of HP blades.

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Reports on the topic "Minimal replacement"

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Knepper, Randy. NAPSR-C11 State Pipeline Safety Requirements-Initiatives Providing Increased Public Safety Levels vs CFR. Pipeline Research Council International, Inc. (PRCI), 2011. http://dx.doi.org/10.55274/r0011864.

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Over 1,150 specific safety enhancements described in 22 categories ranging from enhanced reporting to record-keeping to cathodic protection to design and installation requirements have been adopted by states to help enhance pipeline safety. Formalized pipeline replacement programs have been employed by many states to address the aging pipeline infrastructure. To date, 45 states have at least one initiative above and beyond the minimum Code of Federal Regulations applying to one or more pipeline operators within their state. It is hoped this report will serve as a detailed resource for examining some of the pipeline safety best practices established by states.

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McLemore, Virginia T., Nels Iverson, Snir Woodard, et al. Geology and Mineral Deposits of the Cornudas Mountains, Otero County, New Mexico. New Mexico Bureau of Geology and Mineral Resources, 2022. http://dx.doi.org/10.58799/ofr-619.

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Re-examination of the rare earth elements (REE) deposits in the Cornudas Mountains is warranted in light of today's economic importance of critical minerals, including REE that are essential in most of our electronic devices. New mapping, petrography, 40Ar/39Ar geochronology, and geochemical analyses have provided a better understanding of the emplacement of these intrusions and associated mineral deposits. The Cornudas Mountains form the northern Trans-Pecos alkaline magmatic province in the southern part of the North American Cordilleran alkaline-igneous belt. The igneous rocks in the Cornudas Mountains were emplaced in two pulses at 37.14-34.5 and 32.48-26.95 Ma, just prior to or during the early phases of Rio Grande rift extension, and consist of 1) larger nepheline syenite-syenite laccoliths and plugs, 2) phonolite plugs, sills, and dikes, 3) smaller syenite plugs and dikes that intrude Permian and Cretaceous sedimentary rocks, and 4) volcanic breccia dikes. New USGS geophysical data indicate that some of these intrusions extend deep into the subsurface, with additional buried intrusions potentially at depth. The focus of REE exploration is along the lower unit (PEnsp2) of the Wind Mountain nepheline syenite laccolith, as well as within syenite-phonolite and volcanic breccia dikes, plugs and skarns and carbonate-replacement deposits in Chess Draw. Some samples contain as much as 3110 ppm total REE. REE could be leached from a mineral concentrate of the REE-bearing minerals (eudialyte, zircon, monazite, bastnasite, calcio-catapleiite, vitusite, roumaite, xenotime). We incorporate whole rock and clinopyroxene chemistry of each intrusion into the clinopyroxene-liquid geothermobarometer (Masotta, 2013) to determine the temperatures and pressures of emplacement. This thermometer provides higher crystallization temperature estimates for the syenite intrusions (857-1027 deg. C) than the phonolite sills (760-869 deg. C). We then use the barometric estimates (0.3-3.3 kbar) to calculate emplacement depths (1.2-12.3 km). Pairing these depths with the new geochronology, minimum exhumation rates for intrusions in the Cornudas Mountains are estimated that range from 0.04-0.34 mm/yr crystallization temperatures and exhumation rates provide additional information to aid in developing a model for the formation of REE deposits.

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Wu, Yingjie, Selim Gunay, and Khalid Mosalam. Hybrid Simulations for the Seismic Evaluation of Resilient Highway Bridge Systems. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2020. http://dx.doi.org/10.55461/ytgv8834.

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Bridges often serve as key links in local and national transportation networks. Bridge closures can result in severe costs, not only in the form of repair or replacement, but also in the form of economic losses related to medium- and long-term interruption of businesses and disruption to surrounding communities. In addition, continuous functionality of bridges is very important after any seismic event for emergency response and recovery purposes. Considering the importance of these structures, the associated structural design philosophy is shifting from collapse prevention to maintaining functionality in the aftermath of moderate to strong earthquakes, referred to as “resiliency” in earthquake engineering research. Moreover, the associated construction philosophy is being modernized with the utilization of accelerated bridge construction (ABC) techniques, which strive to reduce the impact of construction on traffic, society, economy and on-site safety. This report presents two bridge systems that target the aforementioned issues. A study that combined numerical and experimental research was undertaken to characterize the seismic performance of these bridge systems. The first part of the study focuses on the structural system-level response of highway bridges that incorporate a class of innovative connecting devices called the “V-connector,”, which can be used to connect two components in a structural system, e.g., the column and the bridge deck, or the column and its foundation. This device, designed by ACII, Inc., results in an isolation surface at the connection plane via a connector rod placed in a V-shaped tube that is embedded into the concrete. Energy dissipation is provided by friction between a special washer located around the V-shaped tube and a top plate. Because of the period elongation due to the isolation layer and the limited amount of force transferred by the relatively flexible connector rod, bridge columns are protected from experiencing damage, thus leading to improved seismic behavior. The V-connector system also facilitates the ABC by allowing on-site assembly of prefabricated structural parts including those of the V-connector. A single-column, two-span highway bridge located in Northern California was used for the proof-of-concept of the proposed V-connector protective system. The V-connector was designed to result in an elastic bridge response based on nonlinear dynamic analyses of the bridge model with the V-connector. Accordingly, a one-third scale V-connector was fabricated based on a set of selected design parameters. A quasi-static cyclic test was first conducted to characterize the force-displacement relationship of the V-connector, followed by a hybrid simulation (HS) test in the longitudinal direction of the bridge to verify the intended linear elastic response of the bridge system. In the HS test, all bridge components were analytically modeled except for the V-connector, which was simulated as the experimental substructure in a specially designed and constructed test setup. Linear elastic bridge response was confirmed according to the HS results. The response of the bridge with the V-connector was compared against that of the as-built bridge without the V-connector, which experienced significant column damage. These results justified the effectiveness of this innovative device. The second part of the study presents the HS test conducted on a one-third scale two-column bridge bent with self-centering columns (broadly defined as “resilient columns” in this study) to reduce (or ultimately eliminate) any residual drifts. The comparison of the HS test with a previously conducted shaking table test on an identical bridge bent is one of the highlights of this study. The concept of resiliency was incorporated in the design of the bridge bent columns characterized by a well-balanced combination of self-centering, rocking, and energy-dissipating mechanisms. This combination is expected to lead to minimum damage and low levels of residual drifts. The ABC is achieved by utilizing precast columns and end members (cap beam and foundation) through an innovative socket connection. In order to conduct the HS test, a new hybrid simulation system (HSS) was developed, utilizing commonly available software and hardware components in most structural laboratories including: a computational platform using Matlab/Simulink [MathWorks 2015], an interface hardware/software platform dSPACE [2017], and MTS controllers and data acquisition (DAQ) system for the utilized actuators and sensors. Proper operation of the HSS was verified using a trial run without the test specimen before the actual HS test. In the conducted HS test, the two-column bridge bent was simulated as the experimental substructure while modeling the horizontal and vertical inertia masses and corresponding mass proportional damping in the computer. The same ground motions from the shaking table test, consisting of one horizontal component and the vertical component, were applied as input excitations to the equations of motion in the HS. Good matching was obtained between the shaking table and the HS test results, demonstrating the appropriateness of the defined governing equations of motion and the employed damping model, in addition to the reliability of the developed HSS with minimum simulation errors. The small residual drifts and the minimum level of structural damage at large peak drift levels demonstrated the superior seismic response of the innovative design of the bridge bent with self-centering columns. The reliability of the developed HS approach motivated performing a follow-up HS study focusing on the transverse direction of the bridge, where the entire two-span bridge deck and its abutments represented the computational substructure, while the two-column bridge bent was the physical substructure. This investigation was effective in shedding light on the system-level performance of the entire bridge system that incorporated innovative bridge bent design beyond what can be achieved via shaking table tests, which are usually limited by large-scale bridge system testing capacities.

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