Thematische Bibliographien / System collapse

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Auswahl der wissenschaftlichen Literatur zum Thema „System collapse“

Autor: Grafiati

Veröffentlicht am 24. Juni 2021

Zuletzt aktualisiert am 5. Februar 2022

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Zeitschriftenartikel zum Thema "System collapse"

Mehrabi, Zia. „Food system collapse“. Nature Climate Change 10, Nr. 1 (09.12.2019): 16–17. http://dx.doi.org/10.1038/s41558-019-0643-1.

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Zhang, Zhuo Qun, You Xin Lin und Hong Nan Li. „Wind-Induced Progressive Collapsed Performance of Cup-Type Transmission Tower-Line System“. Applied Mechanics and Materials 353-356 (August 2013): 2392–96. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2392.

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The Cup-type transmission tower-line system was a classic representative of high voltage electric power carrier, which was an important lifeline project. However, it frequently collapsed under different environmental loadings, especially strong wind. In this work, four tower five line finite element models simulated wind-induced progressive collapse process by birth-to-death element technique in ABAQUS/Explicit. The numerical simulation results demonstrated that this application could describe the structural collapse performance clearly and effectively and transmission tower-line system collapse path depended on the number, position and last deformation of damage elements.

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Hasegawa, Kazuhiro, Ko Kitahara, Toshiaki Hara, Ko Takano, Haruka Shimoda und Takao Homma. „Evaluation of lumbar segmental instability in degenerative diseases by using a new intraoperative measurement system“. Journal of Neurosurgery: Spine 8, Nr. 3 (März 2008): 255–62. http://dx.doi.org/10.3171/spi/2008/8/3/255.

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Object In vivo quantitative measurement of lumbar segmental stability has not been established. The authors developed a new measurement system to determine intraoperative lumbar stability. The objective of this study was to clarify the biomechanical properties of degenerative lumbar segments by using the new method. Methods Twenty-two patients with a degenerative symptomatic segment were studied and their measurements compared with those obtained in normal or asymptomatic degenerative segments (Normal group). The measurement system produces cyclic flexion–extension through spinous process holders by using a computer-controlled motion generator with all ligamentous structures intact. The following biomechanical parameters were determined: stiffness, absorption energy (AE), and neutral zone (NZ). Discs with degeneration were divided into 2 groups based on magnetic resonance imaging grading: degeneration without collapse (Collapse[−]) and degeneration with collapse (Collapse[+]). Biomechanical parameters were compared among the groups. Relationships among the biomechanical parameters and age, diagnosis, or radiographic parameters were analyzed. Results The mean stiffness value in the Normal group was significantly greater than that in Collapse(−) or Collapse(+) group. There was no significant difference in the average AE value among the Normal, Collapse(−), and Collapse(+) groups. The NZ in the Collapse(−) was significantly higher than in the Normal or Collapse(+) groups. Stiffness was negatively and NZ was positively correlated with age. Stiffness demonstrated a significant negative and NZ a significant positive relationship with disc height, however. Conclusions There were no significant differences in stiffness between spines in the Collapse(−) and Collapse(+) groups. The values of a more sensitive parameter, NZ, were higher in Collapse(−) than in Collapse(+) groups, demonstrating that degenerative segments with preserved disc height have a latent instability compared to segments with collapsed discs.

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Tao, Zhigang, Tongxing Zhang, Daoyong Zhu, Weili Gong und Manchao He. „Physical Modeling Test on Deformation and Failure of Rock Slope with New Support System“. Advances in Civil Engineering 2020 (29.06.2020): 1–18. http://dx.doi.org/10.1155/2020/8825220.

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In order to explore the monitoring and control method of rock slope, indoor physical model testing of collapse control and monitoring were carried out with the example of a rock slope collapse area project in Jietai Temple in Beijing, China, as the prototype. Based on the similarity theory, in this study, a new structural support with Negative Poisson’s Ratio bolt and flexible anchored net was utilized to reinforce the rock slope. Following a graded loading sequence, the collapse failure characteristics and the overall control effect of energy absorption reinforcement measures were explored. The experimental results demonstrated that the entire process of slope collapse presented four distinct stages of failure: fracture generation, fracture propagation, partial collapse, and overall collapse. The full-field displacement nephogram and the displacement monitoring point of the collapse area indicated that the large deformation and failure of the collapsed surrounding rock were effectively controlled, while the Negative Poisson’s Ratio bolt and the flexible anchored net had good reinforcement effects. The experimental stress record presented that the change of pressure curve was an apparent regularity in the entire process of slope collapse, which reflects the change state of internal force of surrounding rock; it includes the function of monitoring of slope collapse. It was indicated that the Negative Poisson’s Ratio bolt along with the large-deformation flexible anchored net had good reinforcement monitoring effect on the rock slope collapse disaster.

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DAY, S. J., J. C. CARRACEDO und H. GUILLOU. „Age and geometry of an aborted rift flank collapse: the San Andres fault system, El Hierro, Canary Islands“. Geological Magazine 134, Nr. 4 (Juli 1997): 523–37. http://dx.doi.org/10.1017/s0016756897007243.

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The catastrophic slope failures and landslides that occur in the final stages of lateral collapses of volcanoes destroy much of the evidence for precursory deformation and the early stages of the collapses concerned. Aborted or incomplete collapse structures, although rare, are rich sources of information on these stages of development of catastrophic collapses. The San Andres fault system, on the volcanic island of El Hierro, is a relatively young (between about 545 and about 261–176 ka old) but inactive lateral collapse structure. It appears to represent an aborted giant landslide. It is developed along the flank of a steep-sided volcanic rift zone, and is bounded by a discrete strike-slip fault zone at the up-rift end, closest to the centre of the island. This geometry differs markedly from that of collapse structures on stratovolcanoes but bears some similarities to that of active fault systems on Hawaii. Although the fault system has undergone little erosion, cataclasites which formed close to the palaeosurface are well exposed. These cataclasites are amongst the first fault rocks to be described from volcano lateral collapse structures and include the only pseudotachylytes to have been identified in such structures to date. Their development at unusually shallow depths is attributed to large movements on the fault in a single event, the inferred aborted landslide, and a lack of pressurized pore water. The absence of pressurized fluids in the slumping block may have caused the San Andres fault system to cease moving, rather than develop into a giant volcanic landslide. The recognition that the San Andres fault system is inactive greatly reduces the estimated volcanic hazard associated with El Hierro. However, the lack of evidence for precursory deformation prior to the aborted landslide event is disturbing as it implies that giant lateral collapses can occur on steep-sided oceanic islands with little warning.

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Moede, John D. „Medical Aspects of Urban Heavy Rescue“. Prehospital and Disaster Medicine 6, Nr. 3 (September 1991): 341–48. http://dx.doi.org/10.1017/s1049023x00038784.

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The concept of Urban Heavy Rescue is gaining increasing recognition within the emergency response community. Urban Heavy Rescue has come to denote the unique demands for special equipment and personnel as the result of structural collapse. Recent earthquakes in California, the Philippines, and Soviet Armenia as well as the building collapses in Brownsville, Texas, and New York City provided excellent demonstrations of the concept of specialized structural collapse teams. These events even have prompted the Federal Emergency Management Agency (FEMA) to establish a National Urban Search and Rescue System of special task forces trained in victim location and extrication from collapsed structures. This system will comprise an immediate federal response mechanism for assisting first responders in such activities. The National Search and Rescue System was based on post-event evaluations that pointed out a need not only for more applicable equipment and trained personnel, but also for the timely placement of the these resources.

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Luo, Jing, Weilin Xu, Jun Deng, Yanwei Zhai und Qi Zhang. „Experimental Study on the Impact Characteristics of Cavitation Bubble Collapse on a Wall“. Water 10, Nr. 9 (15.09.2018): 1262. http://dx.doi.org/10.3390/w10091262.

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As a hydrodynamic phenomenon, cavitation is a main concern in many industries such as water conservancy, the chemical industry and medical care. There are many studies on the generation, development and collapse of cavitation bubbles, but there are few studies on the variation of the cyclic impact strength on walls from the collapse of cavitation bubbles. In this paper, a high-speed dynamic acquisition and analysis system and a pressure measuring system are combined to study the impact of a cavitation bubble generated near a wall for various distances between the cavitation bubble and the wall. The results show that (1) with the discriminating criteria of the impact pressure borne by the wall, the critical conditions for the generation of a micro-jet in the collapse process of the cavitation bubbles are obtained, and therefore collapses of cavitation bubbles near the wall are mainly divided into primary impact area collapses, secondary impact area collapses and slow release area collapses; (2) it can be seen from the impact strength of the cavitation bubble collapse on the wall surface that the impact of cavitation bubbles on the wall surface during the first collapse decreases as γ (the dimensionless distance between the cavitation bubble and the wall) increases, but the impact of the second collapse on the wall surface increases first and then decreases sharply. When γ is less than 1.33, the impact on the wall surface is mainly from the first collapse. When γ is between 1.33 and 2.37, the impact on the wall surface is mainly from the second collapse. These conclusions have potential theoretical value for the utilization or prevention and control technologies for cavitation erosion.

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Houston, Sandra L., Hisham H. H. Mahmoud und William N. Houston. „Down-Hole Collapse Test System“. Journal of Geotechnical Engineering 121, Nr. 4 (April 1995): 341–49. http://dx.doi.org/10.1061/(asce)0733-9410(1995)121:4(341).

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Tian, Li, Xin Zhang und Xing Fu. „Fragility analysis of a long-span transmission tower–line system under wind loads“. Advances in Structural Engineering 23, Nr. 10 (27.02.2020): 2110–20. http://dx.doi.org/10.1177/1369433220903983.

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Numerous transmission towers have collapsed due to experiencing strong winds; therefore, the purpose of this article is to investigate the collapse mechanism and the anti-collapse performance of a long-span transmission tower–line system. The detailed finite element model of a typical tower–line system is established in ABAQUS. A global damage index is proposed to quantitatively estimate the overall damage of the structure and define the collapse criteria. An incremental dynamic analysis is performed to obtain the collapse mechanism and the ultimate capacity of the structure. Subsequently, a fragility analysis for evaluating the anti-collapse performance is conducted due to the uncertainty of wind loads. Eventually, the influence of the wind attack angle and the length of the side spans on the fragility is discussed. The results demonstrate that the proposed global damage index is capable of quantitatively reflecting the overall damage and assessing the ultimate capacity of the structure. In addition, the uncertainty of the wind load has a significant influence on the ultimate capacity and the failure position. Furthermore, the results reveal that the wind attack angle and the length of the side spans have an apparent effect on the fragility of the structure.

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M. Becerra, Laura, Carlo Bianco, Chris Fryer, Jorge Rueda und Remo Ruffini. „On the Induced Gravitational Collapse“. EPJ Web of Conferences 168 (2018): 02005. http://dx.doi.org/10.1051/epjconf/201816802005.

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The induced gravitational collapse (IGC) paradigm has been applied to explain the long gamma ray burst (GRB) associated with type Ic supernova, and recently the Xray flashes (XRFs). The progenitor is a binary systems of a carbon-oxygen core (CO) and a neutron star (NS). The CO core collapses and undergoes a supernova explosion which triggers the hypercritical accretion onto the NS companion (up to 10-2 M⊙s-1). For the binary driven hypernova (BdHNe), the binary system is enough bound, the NS reach its critical mass, and collapse to a black hole (BH) with a GRB emission characterized by an isotropic energy Eiso > 1052 erg. Otherwise, for binary systems with larger binary separations, the hypercritical accretion onto the NS is not sufficient to induced its gravitational collapse, a X-ray flash is produced with Eiso < 1052 erg. We’re going to focus in identify the binary parameters that limits the BdHNe systems with the XRFs systems.

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Dissertationen zum Thema "System collapse"

Al-Ashwal, Natheer Ali Mohammed. „Power system oscillatory instability and collapse prediction“. Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/power-system-oscillatory-instability-and-collapse-prediction(18ffc3fa-9b1b-40c6-b614-d757eb641046).html.

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This thesis investigates the capabilities of the Collapse Prediction Relay (CPR-D) and also investigates the use of system identification for detection of oscillatory instability. Both the CPR-D and system identification are based on system measurements and do not require modelling of the power system. Measurement based stability monitors can help to avoid instability and blackouts, in cases where the available system model can not predict instability. The CPR-D uses frequency patterns in voltage oscillation to detect system instability. The relay is based on non-linear dynamics Theory. If a collapse is predicted, measures could be taken to prevent a blackout. The relay was tested using the output of simulators and was later installed in a substation. The data from laboratory tests and site installations is analysed enabling a detailed evaluation of the CPR-D.Oscillatory instability can be detected by monitoring the damping ratio of oscillations in the power system. Poor damping indicates a smaller stability margin. Subspace identification is used to estimate damping ratios. The method is tested under different conditions and using several power system models. The results show that using several measurements gives more accurate estimates and requires shorter data windows. A selection method for measurements is proposed in the thesis.

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Marticello, Daniel Nicholas Jr. „Complexity within the Air Force acquisition system gaining insight from a theory of collapse“. Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70825.

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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 122-129).
Joseph Tainter's theory of societal collapse is applied in an examination of the U.S. Air Force's aircraft acquisition system in order to gain insight into the enterprise's lagging performance. Theories of collapse at both the societal level and the organizational level are reviewed. Tainter's interrelationship between increasing system complexity and diminishing marginal returns is highlighted as especially relevant to the performance of the Air Force aircraft acquisition enterprise. Using Tainter's theory as a framework, evidence is gathered leading to the conclusions that the Air Force aircraft acquisition enterprise is highly complex and as a result is experiencing diminishing marginal returns. Tainter's framework is then also used to explain why past attempts to reform the enterprise have fallen short of their goals. Previous reform efforts, in the form of reorganizations and senior leader initiatives, have been ineffectual beyond the short term because they fail to reduce the underlying level of complexity within the enterprise. The use of workarounds by stakeholders within the enterprise are shown to be efforts to increase marginal returns and avoid overcomplexity. The primary implication of viewing the Air Force aircraft acquisition enterprise through the lens of Tainter's theory of collapse is that in order to be effective, any effort undertaken to improve the performance of the enterprise must reduce the overall level of complexity within the system. Additional insights include the use of current workarounds as leading indicators of complexity or overly burdensome processes. Lastly, senior acquisition leaders should be prepared should a collapse of the enterprise occur. A vision of a much less complex enterprise should be advocated.
by Daniel Nicholas Marticello Jr.
S.M.in Engineering and Management

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Ambrus, Marcel. „How long does it take until a quantum system reemerges after gravitational collapse? /“. [S.l.] : [s.n.], 2004. http://www.zb.unibe.ch/download/eldiss/04ambrus_m.pdf.

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Manona, Cecil W., und presented at an ISER Seminar March 1995 Paper. „The collapse of the 'tribal authority' system and the rise of civic organisations“. Rhodes University, Institute of Social and Economic Research, 1995. http://hdl.handle.net/10962/2454.

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The paper examines the performance of a local ('tribal') authority which existed in the Keiskammahoek district up to 1993 and accounts for the rise of civic organisations which challenged tribal authorities virtually everywhere in the former Ciskei. It suggests that the problems of this local authority which included inefficiency, corruption and lack of democracy were manifestations of the limitations of the Black Authorities Act of 1951 which attempted to revive traditional authority in the rural areas in south Africa even though this was incompatible with political developments in many other African states, particularly in a period during which the process of decolonisation was at its peak.
Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)

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Gotoda, Takeshi. „Anomalous enstrophy dissipation via triple collapse of point vortices in a Euler-Poincare system“. 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225379.

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Rasch, Sebastian [Verfasser]. „Resilience, collapse and reorganization of a rangeland socio-ecological system in South Africa / Sebastian Rasch“. Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/1107541727/34.

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Beeravolu, Nagendrakumar. „Predicting Voltage Abnormality Using Power System Dynamics“. ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1722.

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The purpose of this dissertation is to analyze dynamic behavior of a stressed power system and to correlate the dynamic responses to a near future system voltage abnormality. It is postulated that the dynamic response of a stressed power system in a short period of time-in seconds-contains sufficient information that will allow prediction of voltage abnormality in future time-in minutes. The PSSE dynamics simulator is used to study the dynamics of the IEEE 39 Bus equivalent test system. To correlate dynamic behavior to system voltage abnormality, this research utilizes two different pattern recognition methods one being algorithmic method known as Regularized Least Square Classification (RLSC) pattern recognition and the other being a statistical method known as Classification and Regression Tree (CART). Dynamics of a stressed test system is captured by introducing numerous contingencies, by driving the system to the point of abnormal operation, and by identifying those simulated contingencies that cause system voltage abnormality. Normal and abnormal voltage cases are simulated using the PSSE dynamics tool. The results of simulation from PSSE dynamics will be divided into two sets of training and testing set data. Each of the two sets of data includes both normal and abnormal voltage cases that are used for development and validation of a discriminator. This research uses stressed system simulation results to train two RLSC and CART pattern recognition models using the training set obtained from the dynamic simulation data. After the training phase, the trained pattern recognition algorithm will be validated using the remainder of data obtained from simulation of the stressed system. This process will determine the prominent features and parameters in the process of classification of normal and abnormal voltage cases from dynamic simulation data. Each of the algorithmic or statistical pattern recognition methods have their advantages and disadvantages and it is the intention of this dissertation to use them only to find correlations between the dynamic behavior of a stressed system in response to severe contingencies and the outcome of the system behavior in a few minutes into the future.

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Di, Palma Debora. „Progressive collapse of concrete structures during construction phase: analysis and measures for risk reduction“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Shoring systems are used as temporary support for structures under construction and their primary function is to support and transmit various types of loads. To optimize this phase it has been developed a technique known as Clearing or partial Striking; it consists in removing a percentage of shores few days after the casting such that the load is redistributed between the slab and the remaining shores. In this way the shores removed in one floor can be used to start building the upper one. It is thus really important to conceive the process in a proper way assuring that the whole system is able to support the loads acting on it. This is the reason for which there is a prudent need to understand which conditions lead to the collapse of shoring systems and what measures can impounded in the design process to mitigate the risk of failure. The aim of this thesis is to perform a progressive collapse analysis, during the construction phase of the building, by instantly removing one or several primary load bearing elements and analyzing the structure’s remaining capability to absorb the damage. The analysis have been performed varying load conditions and slab thicknesses and, once the results from standard shores cases have been obtained, calculations with load limiters have been performed. The entire study has been developed with finite elements by means of ANSYS APDL starting from a FE model developed by Alvarado (2010). The important aspect of this investigation has been the risk reduction of progressive collapse, in particular it has been analyzed the behavior performed by the structure when enhanced support systems are used. Along with the finite element study it has been taken part in a experimental study aimed at analyze the load transmission in enhanced shoring system.

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Dyanat, Mohsen. „The emergence of the new subordinate system in southwest and central Asia after the collapse of the USSR“. Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284621.

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Kuraev, Alexey. „Internationalization of Higher Education in Russia: Collapse or Perpetuation of the Soviet System? A Historical and Conceptual Study“. Thesis, Boston College, 2014. http://hdl.handle.net/2345/3799.

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Thesis advisor: Philip G. Altbach
This study traces the policy and implementation of internationalization in the Russian higher education system from 1917 to the present. The analysis suggests that international academic policy has been applied by the Russian state continuously, though with radically differing emphasis and mechanisms, through the last hundred years. Chapter One presents the research questions, design and methodology of the study. Chapter Two reviews scholarly literature related to academic internationalization and situates this definition within the context of Russian higher education. Chapters 3-5 explore the role of international activities in Russian higher education during the seventy years of the Soviet era. Trends in Soviet academic international policy related to three major historical periods are discussed in this section: a) the initial Bolshevik program for global academic reform; b) Sovietization of higher education in the countries of Communist Bloc; and c) East-West international academic competition during the Cold War period. Chapters 6-7 address the role of internationalization in the reformation of Russian higher education during the last two decades of Post-Soviet period. This section examines the extent and likely outcomes of these changes. This research demonstrates that Russian higher education has had a continuous international aspect, though organized differently than Western structures. The analysis also suggests that key organizational components of the Soviet administrative system still exist in the current Russian higher education structure. The current implementation of internationalization presents Russian academics with an opportunity to enforce academic professionalism and promote their status as global academics. At the same time, however, state organization and governing administration principles of Russian higher education continue to reduce academics to functional executors of state directives and deliverers of vocational training. In this way, internationalization serves as a critical nexus for the collision of traditional administrative structures with the new aspirations of Russian academics
Thesis (PhD) — Boston College, 2014
Submitted to: Boston College. Lynch School of Education
Discipline: Educational Leadership and Higher Education

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Bücher zum Thema "System collapse"

Bankrupt representation and party system collapse. University Park, Pa: Pennsylvania State University Press, 2011.

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Alexander, Dallin, und Lapidus Gail Warshofsky, Hrsg. The Soviet system: From crisis to collapse. Boulder: Westview Press, 1995.

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New York (State). Legislature. Senate. Committee on Investigations, Taxation, and Government Operations. The collapse of the New York City probation system. [Albany, N.Y.?]: New York State Senate Committee on Investigations, Taxation, and Government Operations, 1987.

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Junji, Banno. The formation and collapse of the Meiji constitutional system. Tokyo: Office for the Japanese Studies Center, Japan Foundation, 1987.

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Rothwax, Harold J. Guilty: The collapse of criminal justice. New York: Random House, 1996.

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Rothwax, Harold J. Guilty: The collapse of criminal justice. New York, N.Y: Warner Books, 1997.

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Party-system collapse: The roots of crisis in Peru and Venezuela. Stanford, California: Stanford University Press, 2012.

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The fragmentation of Afghanistan: State formation and collapse in the international system. 2. Aufl. New Haven, CT: Yale University Press, 2002.

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Gill, Graeme J. The collapse of a single party system: The disintegration of the CPSU. Cambridge: Cambridge University Press, 1994.

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The fragmentation of Afghanistan: State formation and collapse in the international system. New Haven, CT: Yale University Press, 1995.

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Buchteile zum Thema "System collapse"

Johnsen, Gudrun. „Collapse“. In Bringing Down the Banking System, 13–18. New York: Palgrave Macmillan US, 2014. http://dx.doi.org/10.1057/9781137347350_2.

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Frezza, Eldo E. „The Perfect System“. In The Healthcare Collapse, 205–10. Boca Raton : Taylor & Francis, 2019.: Productivity Press, 2018. http://dx.doi.org/10.4324/9780429506925-32.

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Frezza, Eldo E. „MACRA and the Merit Incentive Payment System“. In The Healthcare Collapse, 167–70. Boca Raton : Taylor & Francis, 2019.: Productivity Press, 2018. http://dx.doi.org/10.4324/9780429506925-26.

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Dick, J. P. R. „Vertebral Body Collapse“. In Clinical Medicine and the Nervous System, 335–43. London: Springer London, 1992. http://dx.doi.org/10.1007/978-1-4471-3353-7_21.

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Knapp, Andrew. „The Communist Collapse“. In Parties and the Party System in France, 93–119. London: Palgrave Macmillan UK, 2004. http://dx.doi.org/10.1057/9780230503625_4.

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Salvatore, Dominick. „The European Monetary System: Crisis and Future“. In The Collapse of Exchange Rate Regimes, 171–93. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-6289-4_11.

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Baranowski, Shelley. „The Collapse of the Weimar Parliamentary System“. In A Companion to Nazi Germany, 63–76. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781118936894.ch4.

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„CHARACTERIZING PARTY-SYSTEM CHANGES“. In Party-System Collapse, 32–62. Stanford University Press, 2012. http://dx.doi.org/10.2307/j.ctvqsdz54.6.

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„Characterizing Party-System Changes“. In Party-System Collapse, 32–62. Stanford University Press, 2012. http://dx.doi.org/10.11126/stanford/9780804782364.003.0002.

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„Contents“. In Party-System Collapse, v—vi. Stanford University Press, 2020. http://dx.doi.org/10.1515/9780804783927-toc.

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Konferenzberichte zum Thema "System collapse"

Jenkins, N. „Impact of embedded generation on distribution system voltage stability“. In IEE Colloquium on Voltage Collapse. IEE, 1997. http://dx.doi.org/10.1049/ic:19970570.

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Ekwue, A. O. „Integrated methods for voltage stability analysis of the NGC system“. In IEE Colloquium on Voltage Collapse. IEE, 1997. http://dx.doi.org/10.1049/ic:19970564.

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Dandachi, N. H. „Improved algorithm for voltage/VAr management on the NGC system“. In IEE Colloquium on Voltage Collapse. IEE, 1997. http://dx.doi.org/10.1049/ic:19970565.

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Inoshita, Chihiro, Rin Hirakawa, Hideaki Kawano, Kenichi Nakashi und Yoshihisa Nakatoh. „In load collapse prevention system“. In ACIT 2019: 7th ACIS International Conference on Applied Computing and Information Technology. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3325291.3325393.

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Hosseinizadeh, Pouyan, Aziz Guergachi und Vanessa Magness. „Predicting system collapse: Two theoretical models“. In 2009 IEEE International Conference on Systems, Man and Cybernetics - SMC. IEEE, 2009. http://dx.doi.org/10.1109/icsmc.2009.5345979.

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Althowibi, F. A., und M. W. Mustafa. „Power system network sensitivity to Voltage collapse“. In 2012 IEEE International Power Engineering and Optimization Conference (PEOCO). IEEE, 2012. http://dx.doi.org/10.1109/peoco.2012.6230893.

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Suryanarayanan, Sindhu, und N. Rakesh. „Emergency human collapse detection and tracking system“. In 2017 International Conference On Smart Technologies For Smart Nation (SmartTechCon). IEEE, 2017. http://dx.doi.org/10.1109/smarttechcon.2017.8358390.

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Yingyun Sun, Wei Hu, Mingjie Li, Xuemin Zhang und Shengwei Mei. „Collapse prevention research for Sichuan power system“. In 7th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2006). IEE, 2006. http://dx.doi.org/10.1049/cp:20062095.

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Zallen, Rubin M. „Collapse of Underground Storm Water Detention System“. In Second Forensic Engineering Congress. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40482(280)11.

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Peraza, David B. „Tropicana Garage Collapse“. In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2172.

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In 2003, a major collapse occurred during construction of a parking garage at the Tropicana Hotel in Atlantic City, New Jersey. It resulted in four fatalities, dozens of injured workers, and significant delays to the construction project. The legal matter was eventually settled out of court, reportedly for $100 million US dollars.The author led the structural investigation into the collapse on behalf of the General Contractor. The investigation included numerous site visits, preservation of structural evidence, review of design drawings and contractor’s shop drawings, structural analyses, and litigation support.The concrete parking garage was being constructed with a proprietary structural floor system, which involved “stay‐in‐place” precast concrete forms that became composite with the cast‐in‐place concrete slabs and wide beams.The investigation presented significant challenges due to the intertwined design responsibilities for the system, the difficulty of preserving perishable evidence during the demolition of the unstable structure, the high‐profile nature of the collapse, and the diverse interests of the many involved parties.The matter settled out of court, so the results of technical investigations and the lessons learned have not been widely disseminated previously.This paper will describe the engineering investigation and findings, discuss the roles and responsibilities of the designers and others, and present recommendations to reduce future failures of similarly organized projects.

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Berichte der Organisationen zum Thema "System collapse"

Perdigão, Rui A. P., und Julia Hall. Spatiotemporal Causality and Predictability Beyond Recurrence Collapse in Complex Coevolutionary Systems. Meteoceanics, November 2020. http://dx.doi.org/10.46337/201111.

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Causality and Predictability of Complex Systems pose fundamental challenges even under well-defined structural stochastic-dynamic conditions where the laws of motion and system symmetries are known. However, the edifice of complexity can be profoundly transformed by structural-functional coevolution and non-recurrent elusive mechanisms changing the very same invariants of motion that had been taken for granted. This leads to recurrence collapse and memory loss, precluding the ability of traditional stochastic-dynamic and information-theoretic metrics to provide reliable information about the non-recurrent emergence of fundamental new properties absent from the a priori kinematic geometric and statistical features. Unveiling causal mechanisms and eliciting system dynamic predictability under such challenging conditions is not only a fundamental problem in mathematical and statistical physics, but also one of critical importance to dynamic modelling, risk assessment and decision support e.g. regarding non-recurrent critical transitions and extreme events. In order to address these challenges, generalized metrics in non-ergodic information physics are hereby introduced for unveiling elusive dynamics, causality and predictability of complex dynamical systems undergoing far-from-equilibrium structural-functional coevolution. With these methodological developments at hand, hidden dynamic information is hereby brought out and explicitly quantified even beyond post-critical regime collapse, long after statistical information is lost. The added causal insights and operational predictive value are further highlighted by evaluating the new information metrics among statistically independent variables, where traditional techniques therefore find no information links. Notwithstanding the factorability of the distributions associated to the aforementioned independent variables, synergistic and redundant information are found to emerge from microphysical, event-scale codependencies in far-from-equilibrium nonlinear statistical mechanics. The findings are illustrated to shed light onto fundamental causal mechanisms and unveil elusive dynamic predictability of non-recurrent critical transitions and extreme events across multiscale hydro-climatic problems.

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Koomar, Saalim, Caitlin Moss Coflan und Tom Kaye. Using EdTech in Settings of Fragility, Conflict and Violence: A Curated Resource List. EdTech Hub, Juni 2020. http://dx.doi.org/10.53832/edtechhub.0042.

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This curated list of resources collates interventions that effectively deploy education technology in settings of fragility, conflict and violence (FCV). The World Bank (2020) states that by 2030 FCV settings will be home to up to two thirds of the world’s extreme poor; these settings have become increasingly complex over the past decade, with the COVID-19 pandemic threatening to exacerbate existing challenges. This list explores effective uses of EdTech in FCV settings. It particularly emphasises interventions and evidence relevant to the Yemeni context and distance learning during the COVID-19 crisis. These resources were selected with the intention to include practical recommendations on technology-enabled interventions which could support a proposed national distance learning system in Yemen.

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Millington, Kerry A. Protecting and Promoting Systems for Essential Health Services During Rollout of COVID-19 Tools. Institute of Development Studies (IDS), Mai 2021. http://dx.doi.org/10.19088/k4d.2021.084.

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The COVID-19 pandemic has had a tremendous negative impact on economies of most countries around the world. COVID-19 has disrupted the ability of health systems to deliver on essential health services and has also exposed pre-existing vulnerabilities and inequities in public health systems. According to a key informant survey conducted by WHO, over one year into the COVID-19 pandemic, there still exist substantial disruptions to essential health services. This rapid review examines evidence on successful interventions that could enable adaptive approaches to help manage and respond future pandemics and mitigate the risk of collapse of the public health systems. Countries must use the opportunity provided by the deployment of COVID-19 vaccines to strengthen health services and health systems and find long-lasting solutions for similar future challenges. The review notes that there still exist gaps in preparedness and response to the Covid-19 pandemic. New variants of concern threaten the effectiveness of existing COVID-19 vaccines, vaccine hesitancy slowing rollout, including in Africa, and interrupted and limited supply of COVID-19 tools. More funding is required though to scale up adaptive measures which are working, accelerating new approaches and innovations to improve service delivery. This review also highlights briefly the plight of marginalised social groups, people living with disabilities, women and children during the pandemic. According to estimates by Global Fund, Gavi, Global Financing Facility, access to life-saving health interventions for women, children and adolescents in 36 of the world’s poorest countries has dropped by as much as 25% due to COVID-19. Countries must build on the momentum of health innovations during the COVID-19 crisis to build more resilient health systems that can withstand disruptions by future pandemics.

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Biggs, J., K. Bennett und P. R. Fresquez. Evaluation of habitat use by Rocky Mountain elk (Cervus elaphus nelsoni) in north-central New Mexico using global positioning system radio collars. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/468551.

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Bennett, K., J. Biggs und P. R. Fresquez. Determination of locational error associated with global positioning system (GPS) radio collars in relation to vegetation and topography in north-central New Mexico. Office of Scientific and Technical Information (OSTI), Februar 1997. http://dx.doi.org/10.2172/468550.

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Ayers, R., G. P. Course und G. R. Pasco. Scottish Inshore Fisheries Integrated Data System (SIFIDS): work package (2) final report WP2A: development and pilot deployment of a prototypic autonomous fisheries data harvesting system, and WP2B: investigation into the availability and adaptability of novel technological approaches to data collection. Herausgegeben von Mark James und Hannah Ladd-Jones. Marine Alliance for Science and Technology for Scotland (MASTS), 2019. http://dx.doi.org/10.15664/10023.23443.

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[Extract from Executive Summary] To enhance sustainability and foster resilience within Scotland’s inshore fishing communities an effective system of collecting and sharing relevant data is required. To support business decisions made by vessel owners as well as informing fisheries managers and those involved in marine planning it will be vital to collect a range of information which will provide a robust understanding of fishing activity, the economic value of the sector and its importance within local communities. The SIFIDS Project was conceived to assist in attaining these goals by working alongside fishers to develop and test technology to automatically collect and collate data on board vessels, thereby reducing the reporting burden on fishers. The project built upon previous research funded through the European Fisheries Fund (EFF) and was designed to deliver a step change in the way that inshore fisheries in Scotland could be managed in cooperation with the industry. The project focussed on inshore fishing vessels around Scotland, where spatio-temporal information on the distribution of vessels and associated fishing effort is data deficient. The whole project was broken down into 12 highly integrated work packages. This is the integrated report for work packages 2A and 2B, entitled’ Development and Pilot Deployment of a Prototypic Autonomous Fisheries Data Harvesting System’ (2A) and ‘Investigation into the Availability and Adaptability of Novel Technological Approaches to Data Collection’ (2B).

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A STUDY OF COLLAPSE SUSCEPTIBILITY AND RESISTANCE OF LOADED CABLE-SUPPORTED PIPE STRUCTURE SUBJECT TO A SUDDEN BREAK OF CABLE MEMBER. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.7.

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Cable-supported pipe system (CSPS) provides a suitable system of structure for meeting the stringent structural requirements of pipeline bridges. However, due to a composite action of cable with truss and pipe members, the sudden failure of its structural member may lead to undesired vibratory response and collapse. The occurrence of a sudden break of the CSPS structural member is characterized by spontaneous dynamics and internal force rearrangement. The present study aims to investigate parametrically the collapse susceptibility and resistance of scaled down CSPS model in the event of a sudden break of the cable member by combined experimental and numerical procedures. The displacement of the structure, the pattern of internal force rearrangement, and dynamic responses were comparatively evaluated. Experimental results depict imminent cable failure under load and attendant dynamic response, but without a total collapse of the CSPS structure. Critical members causing large dynamic response amplitudes were identified and the mitigation of collapse was evaluated. Dynamic increasing factor (DIF) methods was utilized for the evaluation of the dynamic response of the sudden cable break resulting from the pattern of responses between the cable members and the rest of the CSPS structure. Comparison with provisions in other studies shows higher values DIF of the CSPS cable members which led to proposed evaluation using dynamic factor (DF). Thus, the dynamic factors for the sudden break of various cable members along the span and the errors were also estimated considering the parametric of design variables which will enable easy utilization during the structural process of CSPS.

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MITIGATION OF FIRE-INDUCED PROGRESSIVE COLLAPSE OF STEEL FRAMED STRUCTURES USING BRACING SYSTEMS. The Hong Kong Institute of Steel Construction, Mai 2019. http://dx.doi.org/10.18057/ijasc.2019.15.2.9.

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