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Journal articles on the topic 'Instantaneous Failure Rate'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Mercier, Sophie, and Michel Roussignol. "Asymptotic failure rate of a Markov deteriorating system with preventive maintenance." Journal of Applied Probability 40, no. 1 (2003): 1–19. http://dx.doi.org/10.1239/jap/1044476824.

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We consider a system with a finite state space subject to continuous-time Markovian deterioration while running that leads to failure. Failures are instantaneously detected. This system is submitted to sequential checking and preventive maintenance: up states are divided into ‘good’ and ‘degraded’ ones and the system is sequentially checked through perfect and instantaneous inspections until it is found in a degraded up state and stopped to allow maintenance (or until it fails). Time between inspections is random and is chosen at each inspection according to the current degradation degree of t

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2

Mercier, Sophie, and Michel Roussignol. "Asymptotic failure rate of a Markov deteriorating system with preventive maintenance." Journal of Applied Probability 40, no. 01 (2003): 1–19. http://dx.doi.org/10.1017/s0021900200022233.

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We consider a system with a finite state space subject to continuous-time Markovian deterioration while running that leads to failure. Failures are instantaneously detected. This system is submitted to sequential checking and preventive maintenance: up states are divided into ‘good’ and ‘degraded’ ones and the system is sequentially checked through perfect and instantaneous inspections until it is found in a degraded up state and stopped to allow maintenance (or until it fails). Time between inspections is random and is chosen at each inspection according to the current degradation degree of t

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3

Yi, Yang, Ren Si Chao, Fan Guimei, and Kang Rui. "NUMERICAL SIMULATION ON THE EXISTENCE OF FLUCTUATION OF INSTANTANEOUS AVAILABILITY." Transactions of the Canadian Society for Mechanical Engineering 40, no. 5 (2016): 703–13. http://dx.doi.org/10.1139/tcsme-2016-0057.

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This paper considers the fluctuation of the instantaneous availability by numerical methods for a one-unit repairable system. The choices of the failure rate and repair rate are linear or cubic increasing functions. For the equation of instantaneous availability composing of two convolutions, the following numerical methods are used: the composite Simpson formula and the trapezoidal formula. That is to say, the simulated curves of instantaneous availability under any condition are obtained. Through the simulated results, when the failure rate and repair rate are selected as increasing function

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4

Yue, Shaofei, Kai Wang, Xiaoqiang Zhang, Tianhe Kang, Jianbing Yan, and Yulong Jiang. "Creep and Hardening Characteristics of Anthracite under Graded Static–Dynamic Coupled Loading." Applied Sciences 13, no. 19 (2023): 10648. http://dx.doi.org/10.3390/app131910648.

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Remaining coal pillars in remining areas exhibit clear creep characteristics, and dynamic pressure accelerates their instability and failure. The creep and hardening characteristics of coal under dynamic pressure are of great engineering significance for the stability of remaining coal pillars in remining areas and their control. To investigate the creep and hardening characteristics of anthracite under static–dynamic coupled loading, graded loading creep tests with different loading rates were conducted. In this research, the creep strain, instantaneous elastic modulus, and creep rate of anth

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5

Moriya, K., J. T. Pearson, W. W. Burggren, A. Ar, and H. Tazawa. "Continuous measurements of instantaneous heart rate and its fluctuations before and after hatching in chickens." Journal of Experimental Biology 203, no. 5 (2000): 895–903. http://dx.doi.org/10.1242/jeb.203.5.895.

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There has been considerable interest in heart rate (fh) fluctuations in relation to cardiovascular control systems and foetal conditions during pregnancy in mammals. Prominent fluctuations in fh also occur in avian embryos, which are an important experimental model for studying developmental physiology. The present study determined the instantaneous fh of seven chick embryos continuously from the last stage of prenatal development (day 18), throughout the pipping (perinatal) period (days 19–21) until hatching and, subsequently, of newly hatched chicks (up to day 2). The distinctive patterns of

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6

Yan, Jianbing, Xiaoqiang Zhang, Kai Wang, Xuanmin Song, Shaofei Yue, and Jian Hou. "Experimental Study on Creep Characteristics and Long–Term Strength of Anthracite." Processes 11, no. 3 (2023): 947. http://dx.doi.org/10.3390/pr11030947.

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Coal pillars from old mines undergo creep, a type of time−dependent deformation. Research on underground engineering stability of coal mines has increasingly focused on long−term strength as an important mechanical index of the creep characteristics of coal pillars. This study performed conventional triaxial compression and triaxial creep tests of anthracite under different confining pressures. The creep law of anthracite and the long−term strength of anthracite was studied according to the test results. The test results demonstrated the following: (1) The conventional elastic modulus and peak

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7

Burde, Gila, Ahron Rosenfeld, and Zachary Sheaffer. "Prediction of Financial Vulnerability to Funding Instability." Nonprofit and Voluntary Sector Quarterly 46, no. 2 (2016): 280–304. http://dx.doi.org/10.1177/0899764016655618.

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Financial vulnerability of nonprofit organizations arising from governmental funding instability is examined using hazard analysis. Funding instability is characterized by time-at-risk, and vulnerability is expressed by hazard rate measuring the speed of nonprofit organizations closure. The analysis provides estimation of instantaneous probability of a nonprofit organization failure at a given point in time. Drawing on 2,660 Israeli nonprofit organizations, we found that the relationship between hazard rate and time-at-risk has an inverted U–shape curve; hazard rate increases with time-at-risk

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8

Sarig, Erez, Michael Evzelman, and Mor Mordechai Peretz. "Analog Frontend for Big Data Compression and Instantaneous Failure Prediction in Power Management Systems." Electronics 14, no. 3 (2025): 641. https://doi.org/10.3390/electronics14030641.

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An innovative analog frontend for big data collection and intelligent compression as part of an instantaneous failure prediction platform is presented. Failure prediction in power management systems is crucial for increasing uptime and preventing massive failure. Accurate failure prediction, with real-time decision-making, requires data collection from many wide-bandwidth signals within a system, as low-bandwidth information such as DC output voltage is of limited value for decision-making and failure prediction. Analog compression, data profiling, and anomaly detection methods enabled by the

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9

Kulkarni, Abhaya V., James M. Drake, John R. W. Kestle, Conor L. Mallucci, Spyros Sgouros, and Shlomi Constantini. "Predicting who will benefit from endoscopic third ventriculostomy compared with shunt insertion in childhood hydrocephalus using the ETV Success Score." Journal of Neurosurgery: Pediatrics 6, no. 4 (2010): 310–15. http://dx.doi.org/10.3171/2010.8.peds103.

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Object The authors recently developed and internally validated the ETV Success Score (ETVSS)—a simplified means of predicting the 6-month success rate of endoscopic third ventriculostomy (ETV) for a child with hydrocephalus, based on age, etiology of hydrocephalus, and presence of a previous shunt. A high ETVSS predicts a high chance of early ETV success. In this paper, they assess the clinical utility of the ETVSS by determining whether long-term survival outcomes for ETV versus shunt insertion are different within strata of ETVSS (low, moderate, and high scores). Methods A multicenter, inter

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10

Buono, Francesco, and Maria Kateri. "Aging Intensity for Step-Stress Accelerated Life Testing Experiments." Entropy 26, no. 5 (2024): 417. http://dx.doi.org/10.3390/e26050417.

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The aging intensity (AI), defined as the ratio of the instantaneous hazard rate and a baseline hazard rate, is a useful tool for the describing reliability properties of a random variable corresponding to a lifetime. In this work, the concept of AI is introduced in step-stress accelerated life testing (SSALT) experiments, providing new insights to the model and enabling the further clarification of the differences between the two commonly employed cumulative exposure (CE) and tampered failure rate (TFR) models. New AI-based estimators for the parameters of a SSALT model are proposed and compar

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11

He, Huajun, and Huahui Jin. "Experimental Study on Influence of Unloading Rate on Creep Characteristics of Marble under High Stress." E3S Web of Conferences 283 (2021): 01052. http://dx.doi.org/10.1051/e3sconf/202128301052.

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In the engineering of high stress area, the measures to control the stability of surrounding rock by reducing excavation footage and excavation speed are to adjust the unloading rate of surrounding rock caused by excavation. In this study, unloading creep tests of marble under high stress conditions were carried out to study the effect of unloading rate. Research results showed that the axial and lateral instantaneous strain and creep strain of the sample increased with the increase of unloading rate; the lateral creep characteristic of marble under unloading condition was stronger than that o

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12

Pinna, G. D., R. Maestri, A. Mortara, and M. T. La Rovere. "Cardiorespiratory interactions during periodic breathing in awake chronic heart failure patients." American Journal of Physiology-Heart and Circulatory Physiology 278, no. 3 (2000): H932—H941. http://dx.doi.org/10.1152/ajpheart.2000.278.3.h932.

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We applied spectral techniques to the analysis of cardiorespiratory signals [instantaneous lung volume (ILV), instantaneous tidal volume (ITV), arterial O2 saturation ([Formula: see text]) at the ear, heart rate (HR), systolic (SAP), and diastolic (DAP) arterial pressure] during nonapneic periodic breathing (PB) in 29 awake chronic heart failure (CHF) patients and estimated the timing relationships between respiratory and slow cardiovascular (<0.04 Hz) oscillations. Our aim was 1) to elucidate major mechanisms involved in cardiorespiratory interactions during PB and 2) to test the hypothesi

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Mjallal, Ibrahim, Hussein Farhat, Mohammad Hammoud, Samer Ali, Ali AL Shaer, and Ali Assi. "Cooling Performance of Heat Sinks Used in Electronic Devices." MATEC Web of Conferences 171 (2018): 02003. http://dx.doi.org/10.1051/matecconf/201817102003.

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Existing passive cooling solutions limit the short-term thermal output of systems, thereby either limiting instantaneous performance or requiring active cooling solutions. As the temperature of the electronic devices increases, their failure rate increases. That’s why electrical devices should be cooled. Conventional electronic cooling systems usually consist of a metal heat sink coupled to a fan. This paper compares the heat distribution on a heat sink relative to different heat fluxes produced by electronic chips. The benefit of adding a fan is also investigated when high levels of heat gene

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14

Guo, Hongjun, Zhongguang Sun, Ming Ji, Yongfeng Wu, and Lihui Nian. "An Investigation on the Impact of Unloading Rate on Coal Mechanical Properties and Energy Evolution Law." International Journal of Environmental Research and Public Health 19, no. 8 (2022): 4546. http://dx.doi.org/10.3390/ijerph19084546.

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In order to further explore the relationship between the excavation speed and the damage of surrounding rocks and dynamic manifestation, the stress paths of unloading confining pressure and loading axial pressure were designed based on the changes in the roadway surrounding rock stress in this study. Additionally, the mechanical properties and energy evolution law of the coal body were investigated under various unloading rates. As the unloading rate increased, the mechanical properties of the coal body including the failure strength, the confining pressure, the axial strain, and horizontal st

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15

Wang, Jinyong, and Xiaoping Mi. "Open Source Software Reliability Model with the Decreasing Trend of Fault Detection Rate." Computer Journal 62, no. 9 (2018): 1301–12. http://dx.doi.org/10.1093/comjnl/bxy111.

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Abstract Software reliability assessment methods have been changed from closed to open source software (OSS). Although numerous new approaches for improving OSS reliability are formulated, they are not used in practice due to their inaccuracy. A new proposed model considering the decreasing trend of fault detection rate is developed in this study to effectively improve OSS reliability. We analyse the changes of the instantaneous fault detection rate over time by using real-world software fault count data from two actual OSS projects, namely, Apache and GNOME, to validate the proposed model per

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16

Hao, Su Feng, Zhong De Shan, Shu Jun Chen, and Chao Jiang. "Hot Stamping High Strength Steel Spot Welding Technology and Quality Evaluation of Welding Joint." Advanced Materials Research 1063 (December 2014): 181–85. http://dx.doi.org/10.4028/www.scientific.net/amr.1063.181.

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The heterogeneity of microstructure and mechanical performance of welding joints were affected by unique material properties such as high resistivity and low thermal conductivity, instantaneous high temperature of spot welding thermal cycle, and uneven local cooling rate. Because of ultra high strength of hot stamping parts, the welding joint is more inclined to fail as the failure mode of interfacial fracture, the traditional critical nugget formula fell down. Through designing orthogonal experiment, the effect of different welding parameters on joint performance was analyzed, the optimized w

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17

Wu, Honghao, Junyong Liu, Jichun Liu, Mingjian Cui, Xuan Liu, and Hongjun Gao. "Power Grid Reliability Evaluation Considering Wind Farm Cyber Security and Ramping Events." Applied Sciences 9, no. 15 (2019): 3003. http://dx.doi.org/10.3390/app9153003.

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The cybersecurity of wind farms is an increasing concern in recent years, and its impacts on the power system reliability have not been fully studied. In this paper, the pressing issues of wind farms, including cybersecurity and wind power ramping events (WPRs) are incorporated into a new reliability evaluation approach. Cyber–physical failures like the instantaneous failure and longtime fatigue of wind turbines are considered in the reliability evaluation. The tripping attack is modeled in a bilevel optimal power flow model which aims to maximize the load shedding on the system’s vulnerable m

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18

Yarmolenko, M., V. Kuzmenko, I. Yarysh, and O. Kubashko. "METHODOLOGY FOR ASSESSING AMMUNITION RELIABILITY ACCORDING TO THE NUT TEST PLAN." Випробування та сертифікація, no. 2(4) (November 7, 2024): 63–74. http://dx.doi.org/10.37701/ts.04.2024.08.

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In the article an ammunition dependability evaluating methodology is created. It is based on test results according to the NUT plan, according to which an initial number N of weapons and military equipment is tested during planned time T, failed products are not restored or replaced, the tests are stopped after the end of the testing time T. Standard evaluating ammunition dependability methods are absent now, so an ammunition dependability evaluating method by results of tests according to the NUT plan for the reliability function during time T P(T)=(0.9; 0.95; 0.98; 0.99; 0.997; 0.999; 0.9994

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19

Guo, Hongjun, Zhongguang Sun, Ming Ji, Dapeng Liu, Lihui Nian, and Yongfeng Wu. "A Study on the Effects of Loading Axial Pressure Rate on Coal Mechanical Properties and Energy Evolution Law." Geofluids 2022 (September 24, 2022): 1–11. http://dx.doi.org/10.1155/2022/5593173.

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Due to the unique nature of the coal mining industry, safety is always one highly upheld premise of high production and high efficiency. According to the stress adjustment characteristics of the surrounding rocks in roadway excavation under a nondisruptive environment, the stress paths of unloading confining pressure and loading axial pressure were designed creatively and vividly, and the coal mechanical properties and energy evolution law under different loading axial pressure rates were studied through a series of experiments. As the loading axial pressure rate increases, the mechanical para

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20

Pinna, G. D., R. Maestri, A. Mortara, M. T. La Rovere, F. Fanfulla, and P. Sleight. "Periodic breathing in heart failure patients: testing the hypothesis of instability of the chemoreflex loop." Journal of Applied Physiology 89, no. 6 (2000): 2147–57. http://dx.doi.org/10.1152/jappl.2000.89.6.2147.

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In this study, we applied time- and frequency-domain signal processing techniques to the analysis of respiratory and arterial O2 saturation (SaO2 ) oscillations during nonapneic periodic breathing (PB) in 37 supine awake chronic heart failure patients. O2 was administered to eight of them at 3 l/min. Instantaneous tidal volume and instantaneous minute ventilation (IMV) signals were obtained from the lung volume signal. The main objectives were to verify 1) whether the timing relationship between IMV and SaO2 was consistent with modeling predictions derived from the instability hypothesis of PB

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21

Liu, Yang, Da Huang, Baoyun Zhao, Chen Wang, and Duofeng Cen. "Nonlinear Creep Behavior and Viscoelastic-Plastic Constitutive Model of Rock-Concrete Composite Mass." Advances in Civil Engineering 2020 (August 27, 2020): 1–14. http://dx.doi.org/10.1155/2020/9059682.

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The joint force deformation of rock-concrete composite structures is different from that of simple rock specimens or concrete specimens, such as the tunnel surrounding rock-lining concrete, dam foundations, and concrete. In order to study the creep mechanical properties of rock-concrete composite structures under long-duration load, the TFD-2000 microcomputer servo triaxial creep testing machine is used to carry out step loading creep tests on rock-concrete composite specimens (hereinafter referred to as composite specimens) under different confining pressures (including the confining pressure

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22

Fan, Qiu Yan, Cai Lin Liu, Ke Qing Yang, and Mei Qian Wang. "Test Study on Creep Character of Anchor Rod in Argillaceous Soft Rock." Advanced Materials Research 396-398 (November 2011): 565–70. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.565.

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The creep character of anchor rod in argillaceous soft rock is remarkable. The big undisturbed mudstone samples in Nanning Basin as a typical argillaceous soft rock is chosen to the research object in this paper. The laboratory simulated destructive tests and the creep tests of full grouted anchor rod have been down. Through the destructive tests of mudstone sample, the instantaneous adhesive strength between the anchor body and mudstone in Nanning Basin is 70kPa. By analyzing the creep curves of anchor rod, a conclusion is that there is a long-term adhesive strength of anchor rod in argillace

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23

Zong, Yijiang, Lijun Han, Yuhao Jin, Weisheng Zhao, and Lingdong Meng. "Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone." Energies 13, no. 3 (2020): 598. http://dx.doi.org/10.3390/en13030598.

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Short-term and creep tests of fractured sandstone with different degrees of damage prepared using pre-peak and post-peak unloading tests on intact sandstone were carried out using a servo-controlled rock mechanics system. Based on our experimental results, the influence of confining pressure and damage on short-term mechanical behavior of fractured sandstone with different degrees of damage was first analyzed. The results show that the peak strength, residual strength, elastic modulus, and secant modulus of fractured sandstone increase linearly with increasing confining pressure, but decrease

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24

Becker, Andrew. "Health indicator metrics applicable to inductive wear debris sensors." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 5 (2016): 583–93. http://dx.doi.org/10.1177/1350650116665047.

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The Inductive Wear Debris Sensor is a relatively new invention that is increasingly being used for the detection of incipient machinery damage or failures by sensing metallic debris in lubrication systems. This type of sensor is typically used in-line and has a superior particle size detection range compared to traditional techniques such as the ubiquitous spectrometric oil analysis. There is, however, very little in the literature regarding the application and interpretation of data arising from this type of sensor. Unlike other condition monitoring sensors, no data will be generated by an In

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25

Baek, Seok Heum, Kyoung Young Lee, Seok Swoo Cho, and Won Sik Joo. "Reliability-Based Optimization for Fatigue Maintenance Planning of Freight Car." Key Engineering Materials 345-346 (August 2007): 1369–72. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1369.

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The performance of bogie decreases according as traveling distance increases. Its causes were expected to be fatigue, wear, and deterioration. Especially, maintenance coat needs about triple than manufacture cost during required life in case of container and uncovered freight car. Freight car doesn’t adapt corrective maintenance which repairs a poor part after a trouble but use preventive maintenance which fixes a bad part before a trouble. There were a few researches on preventive maintenance such as inspect affairs and facilities management. They couldn’t estimate the operation reliability o

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Muñoz Torrecillas, María José, Julian Roche, and Salvador Cruz Rambaud. "Building a Social Discount Rate to be Applied in US Afforestation Project Appraisal." Forests 10, no. 5 (2019): 445. http://dx.doi.org/10.3390/f10050445.

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This paper is focused on searching for the suitable discount rate to be applied to the valuation of a project related to forests in the USA, e.g., a recreational area inside a national park. To do this, we propose a new model based on hazard rate concepts, i.e., based on the risk that waiting time implies. More specifically, we derive the discount function whose instantaneous discount rate is the hazard rate of the system supporting the investment. We determine the rate of failure corresponding to different partition criteria of the whole system; in our case, we can use the information on fore

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27

Tappin, D. R. "Submarine mass failures as tsunami sources: their climate control." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, no. 1919 (2010): 2417–34. http://dx.doi.org/10.1098/rsta.2010.0079.

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Recent research on submarine mass failures (SMFs) shows that they are a source of hazardous tsunamis, with the tsunami magnitude mainly dependent on water depth of failure, SMF volume and failure mechanism, cohesive slump or fragmental landslide. A major control on the mechanism of SMFs is the sediment type, together with its post-depositional alteration. The type of sediment, fine- or coarse-grained, its rate of deposition together with post-depositional processes may all be influenced by climate. Post-depositional processes, termed sediment ‘preconditioning’, are known to promote instability

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Zhang, Jianwei, Bingpeng Wang, Huokun Li, et al. "Progressive Dam-Failure Assessment by Smooth Particle Hydrodynamics (SPH) Method." Water 15, no. 21 (2023): 3869. http://dx.doi.org/10.3390/w15213869.

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The dam-break water flow is a complex fluid motion, showing strong nonlinearity and stochasticity. In order to better study the characteristics of the dam burst flood, the smooth particle hydrodynamics (SPH) method was chosen to establish a two-dimensional classical dam-burst model, and the flow velocity distribution graph was obtained by calculation and compared with the experimental results in the literature, and the fitting degree of the two was obtained to be 88.4%, which verifies the validity of the model. On this basis, according to the principle of dam failure, the two failure modes of

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Liu, Guangcheng, Xin Huang, and Jianyong Pang. "The Uniaxial Creep Characteristics of Red Sandstone under Dry-Wet Cycles." Advances in Civil Engineering 2020 (July 28, 2020): 1–13. http://dx.doi.org/10.1155/2020/8841773.

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Water is one of the most important factors that affect the long-term stability of geotechnical engineering structures. Rainfall often results in periodic changes in the water content in underground rock, which is subjected to alternating dry-wet cycles. In this paper, in order to study the short-term and long-term mechanical properties of red sandstone under these dry-wet cycles, a series of uniaxial compressive strength (UCS) tests and multistage creep tests have been carried out on specimens of red sandstone after being treated to different numbers of dry-wet cycles. A scanning electron micr

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Meadows, Molly, Brian Vuong, Hunter Storaci, Kaysie Tam, and Kevin Shea. "BIOMECHANICAL SIMULATION OF RADIAL HEAD SUBLUXATION IN CADAVERIC PEDIATRIC ELBOWS." Orthopaedic Journal of Sports Medicine 9, no. 7_suppl3 (2021): 2325967121S0015. http://dx.doi.org/10.1177/2325967121s00158.

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Background: Radial head subluxation, known as pulled elbow or Nursemaid’s elbow, is a common pediatric condition that occurs when a longitudinal traction force is applied to an elbow that is pronated and extended. Although the stability of the proximal radioulnar joint has been previously examined in cadaveric models, there are no current studies quantifying the biomechanics of nursemaid’s elbow. The purpose of our study was to demonstrate and quantify the axial traction force required to produce a nursemaid’s elbow in a pediatric cadaver specimen. Methods: Two fresh-frozen cadaveric elbows fr

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GOKHALE, SWAPNA S. "SOFTWARE FAILURE INTENSITY, RELIABILITY AND OPTIMAL STOPPING TIME INCORPORATING REPAIR POLICIES." International Journal of Reliability, Quality and Safety Engineering 13, no. 05 (2006): 455–77. http://dx.doi.org/10.1142/s0218539306002379.

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Reliability of a software application, its failure intensity and the residual number of faults are three important metrics that provide a quantitative assessment of the failure characteristics of an application. Ultimately, it is also necessary, based on these metrics, to determine an optimal release time at which costs justify the stop test decision. Typically, one of the many stochastic models known as software reliability growth models (SRGMs) is used to characterize the failure behavior of an application to provide estimates of the failure intensity, residual number of faults, reliability,

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32

Lambert, Yvan. "Environmental and fishing limitations to the rebuilding of the northern Gulf of St. Lawrence cod stock (Gadus morhua)." Canadian Journal of Fisheries and Aquatic Sciences 68, no. 4 (2011): 618–31. http://dx.doi.org/10.1139/f2011-007.

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Time series of life history traits determining the reproductive potential and productivity of Atlantic cod ( Gadus morhua ) in the northern Gulf of St. Lawrence (nGSL) were obtained for the period covering the collapse and failure of the stock to recover. Decreasing trends in these traits were observed under unfavourable oceanographic conditions, with lowest values reached in the early 1990s. These changes had a negative impact on reproductive rate and instantaneous rate (r) of population growth. Estimates of r used as a proxy of stock productivity were negative when the stock collapsed, indic

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Cui, Yuhong, Youde Tao, and Zongyang Li. "Research on the Reliability of a Two-Robot Security System with Early Warning Function." Journal of Mathematics 2023 (June 2, 2023): 1–20. http://dx.doi.org/10.1155/2023/3214866.

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In this paper, the mathematical model of a kind of two-robot security system with an early warning function is studied. By using strongly continuous operator semigroup theory and Volterra integral equation theory, the properties of the semigroup of the system operator, the existence and uniqueness of nonnegative solution, and the well-posedness of solution are discussed, respectively. Under the assumption that the failure rate and repair rate of the system are constants, the equations of the robot system are transformed into an ordinary differential equation group, and then the instantaneous r

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Zhang, Jinsong, Yaxing Wang, Junjun Liu, and Jiuqun Zou. "Research on the Creep Characteristics of Thermal Insulation Shotcrete under the Action of Temperature and Humidity Circulation." Advances in Civil Engineering 2021 (August 18, 2021): 1–10. http://dx.doi.org/10.1155/2021/9360708.

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In order to explore the creep characteristics of thermal insulation shotcrete under the action of temperature and humidity circulation, a series of uniaxial compression creep tests were carried out with different cycles of temperature and humidity and hierarchical loading conditions. The test results show that the axial creep deformation and creep strain of the thermal insulation shotcrete specimens increase with the increase of the number of drying and wetting cycles under normal temperature water bath condition. After 28 cycles, the deformation value becomes larger obviously, and the creep s

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Borra, Naga Venkata Srinivas, and Veera Venkata Krishna Prasad Davuluri. "Experimental Investigations of Al-Cr3C2 Composite Preform Densification and Deformation." Annales de Chimie - Science des Matériaux 46, no. 4 (2022): 185–92. http://dx.doi.org/10.18280/acsm.460403.

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This investigation on strain hardening, densification and workability of the Sintered aluminium- Chromium Carbide composition of (Al-Cr3C2 of 2, 4 and 6%) preforms subjected to upsetting were investigated in this research. Industrial practitioners needed the workability data and densification mechanisms to plan and envisage the failure strains. In the current study, under triaxial stress state conditions Al-Cr3C2 preform with primary preform densities and various aspect ratios were compressed. Strain hardening, densification behaviors of aluminium- Chromium Carbide be investigated by gradually

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Han, Jia, Ke Xie, Zhaohui Yang, Lin’an Li, and Ming Zhao. "A Study of the Nonlinear Attenuation Behavior of Preload in the Bolt Fastening Process for Offshore Wind Turbine Blades Using Ultrasonic Technology." Energies 18, no. 12 (2025): 3211. https://doi.org/10.3390/en18123211.

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The attenuation of bolt preload is a critical factor leading to bolt fatigue failure, whereas the study of the nonlinear attenuation behavior of preload and its mechanism during installation is an inevitable challenge in engineering practice. The attenuation of the preload of a bolt is mainly related to the stiffness of the bolt body as well as the stiffness of the connected parts. This study aimed to develop an experimental system to analyze the nonlinear attenuation behavior of preload during bolt tightening. First, a simulation system replicating the bolt installation process was constructe

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Chen, Changnian, Haoran Zhao, Chaoyu Liu, et al. "Transient Heat Transfer Characteristics in a Flat Plate Heat Sink with Mini-Channels for Cooling High Heat Flux IGBT." Micromachines 13, no. 9 (2022): 1417. http://dx.doi.org/10.3390/mi13091417.

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Effective cooling of a high heat flux IGBT electronic system is highly related to system efficiency and safety. A flat plate heat sink was designed to experimentally investigate the transient heat transfer characteristics of IGBT cooling. It is made of aluminum with 20 mini-channels of 249 mm × 3 mm × 4 mm dimensions, which were manufactured by milling machines and melt inert gas (MIG) welding technology to ensure no deformation. Experiments were conducted using deionized water at atmospheric pressure with flow rates of 3.2–9.5 L/min and heat fluxes of 104–347 W/cm2. It was found that instanta

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shuangbing, Zhang, and Zhang fang. "P‐12.9: Mechanical simulation analysis of the failure risks and influence factor of foldable module." SID Symposium Digest of Technical Papers 56, S1 (2025): 1539–41. https://doi.org/10.1002/sdtp.19140.

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In order to ensure the foldability of the foldable screen, it has to maintain a low fold stress through optimization of the foldable modulus stacking structure and materials. Nonlinear mechanical simulation can be an effective tool to provide insights into folding behavior. Previous simulation only focused on analyzing the stress of foldable module in the folded state. In this work, the stress of the module was analyzed not only in the folded state but also during the unfolding process by simulation. Different folding programs considering the creep of the adhesive layer in a bending state were

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TAMURA, ATSUTAKA, SADAYUKI HAYASHI, and TAKEO MATSUMOTO. "EFFECT OF LOADING RATE ON VISCOELASTIC PROPERTIES AND LOCAL MECHANICAL HETEROGENEITY OF FRESHLY ISOLATED MUSCLE FIBER BUNDLES SUBJECTED TO UNIAXIAL STRETCHING." Journal of Mechanics in Medicine and Biology 16, no. 06 (2016): 1650086. http://dx.doi.org/10.1142/s021951941650086x.

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To investigate the effect of viscoelastic behavior on instantaneous muscle mechanics, the passive mechanical properties for the range of physiologically relevant rates should be clarified. Therefore, a series of uniaxial extension tests were conducted at various stretching rates using the muscle fiber bundles, which contained extracellular matrix (ECM) and interfibrillar microstructural components. We revealed that the tensile strength is strain rate-sensitive over the examined range, i.e., the muscle fiber bundle failed at 109[Formula: see text][Formula: see text][Formula: see text]34, 122[Fo

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Li, Xuebin, Xuesheng Liu, Yunliang Tan, Qing Ma, Baoyang Wu, and Honglei Wang. "Creep Constitutive Model and Numerical Realization of Coal-Rock Combination Deteriorated by Immersion." Minerals 12, no. 3 (2022): 292. http://dx.doi.org/10.3390/min12030292.

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Coal-rock combination refers to the coal and rock as a whole, and the failure of the whole structure of the combination is the main cause for the instability of the deep underground engineering. In deep underground engineering, the coal-rock combination is usually under certain hydrogeological conditions, and it is prone to seepage and rheological failure instability accidents due to the long-term action of water and stress. In this study, the creep constitutive model of coal-rock combination considering the influence of moisture content was established based on the Burgers creep model. Accord

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Yokoyama, T. "Experimental determination of impact tensile properties of adhesive butt joints with the split Hopkinson bar." Journal of Strain Analysis for Engineering Design 38, no. 3 (2003): 233–45. http://dx.doi.org/10.1243/030932403765310563.

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The tensile strength and energy absorption of adhesive butt joints at high rates of loading are determined with a tensile split Hopkinson bar using a cylindrical specimen. A commercially available single-component cyanoacrylate adhesive (instantaneous adhesive) and two different adherend materials are used in the adhesion tests. The impact tensile strength of the cyanoacrylate adhesive butt joints is determined from the applied tensile stress history at failure initiation. The impact absorbed energy is obtained by numerical integration of dynamic tensile load-adhesive deformation data. Compara

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Zhu, Wanxu, Shiyuan Liang, Kefei Jia, Quanxi Shen, and Dongwen Wu. "Development of an Instantaneous Loading Impact Test System for Containment of a Nuclear Power Plant during Aircraft Impact on Steel Bar Joints." Materials 16, no. 10 (2023): 3892. http://dx.doi.org/10.3390/ma16103892.

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As major projects such as nuclear power plants continuously increase, it is inevitable that loopholes will arise in safety precautions. Airplane anchoring structures, comprising steel joints and acting as a key component of such a major project, directly affect the safety of the project due to their resistance to the instant impact of an airplane. Existing impact testing machines have the limitations of being unable to balance impact velocity and impact force, as well as having inadequate control of impact velocity; they cannot meet the requirements of impact testing for steel mechanical conne

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Ахмедова, Анастасия, Anastasiya Akhmedova, Татьяна Шевцова, et al. "Estimation of Reliability of Fire Alarm System." Food Processing: Techniques and Technology 48, no. 4 (2019): 79–86. http://dx.doi.org/10.21603/2074-9414-2018-4-79-86.

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Improving the safety of human life is one of the main tasks of scientific and technological progress. A dangerous situation occurs when a person is in a dangerous area, i.e. in a space where constantly, periodically, or occasionally there are situations caused by factors that lead to gradual or instantaneous damage to human health. Fire is one of these situations. The safety of technical systems is solidly linked to their reliability. In firefighting automation, the main purpose of calculating reliability is to determine the probability of failure-free operation of the equipment of the system.

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Turner, D. A., and R. Brightwell. "An evaluation of a sequential aerial spraying operation against Glossina pallidipes Austen (Diptera: Glossinidae) in the Lambwe Valley of Kenya: aspects of post-spray recovery and evidence of natural population regulation." Bulletin of Entomological Research 76, no. 2 (1986): 331–49. http://dx.doi.org/10.1017/s0007485300014802.

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AbstractAn attempt to eradicate Glossina pallidipes Austen from the Lambwe Valley of western Kenya by sequential aerial application of endosulfan aerosol spray is described. The operation was ultimately unsuccessful, even after nine sprays of relatively heavy dosages of insecticide. Survivors were present throughout after each spray, and females mated and bred between sprays. The population was reduced by over 99·9% in main habitats of thicket and woodland and by about 90% in conifer plantation. The outcome of a model of spray effectiveness suggested, however, that the final reduction in popul

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Hu, Jinwen, Liyuan Fan, Yifei Lei, Zhao Xu, Wenxing Fu, and Gang Xu. "Reinforcement Learning-Based Low-Altitude Path Planning for UAS Swarm in Diverse Threat Environments." Drones 7, no. 9 (2023): 567. http://dx.doi.org/10.3390/drones7090567.

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Unmanned aircraft systems (UASs) with autonomous maneuvering decision capabilities are expected to play a key role in future unmanned systems applications. While reinforcement learning has proven successful in solving UAS path planning problems in simple urban environments, it remains under-researched for some complex mountain environments. In this paper, the path planning of UAS swarm for the low-altitude rapid traverse in diverse environments is studied when facing the threats of complex terrain, radars and swarm failure. First, a UAS swarm radar detection probability is built up for evaluat

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Wan, Lirong, Dejian Ma, and Xin Zhang. "Research on Meshing Characteristics of Shearer Walking Wheel Based on Rigid-Flexible Coupling." Mathematical Problems in Engineering 2020 (July 30, 2020): 1–11. http://dx.doi.org/10.1155/2020/8301086.

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Frequent failure of the walking wheel seriously restricts the performance of the whole shearer. To reduce the failure rate and improve the working performance of the walking wheel, the meshing characteristics of the tooth pin are researched. The dynamic state equations of the walking wheel and the contact force model of tooth pin meshing are established. The rigid-flexible coupling simulation model of tooth pin meshing is built. The load distribution characteristics of the walking wheel are analyzed, as well as the effects of impact load amplitude and duration. Results show that the curve of t

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Guo, Pengzheng, Jiaming Zhang, Fei Liu, Wenlian Liu, Zhiqiang Wang, and Jipu Chen. "Experimental Study on Shear Creep and Long-Term Strength of Clay-Type Muddy Interlayer." Applied Sciences 13, no. 22 (2023): 12151. http://dx.doi.org/10.3390/app132212151.

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In order to have a better understanding of the shear creep characteristics of muddy interlayer in unstable landslides, we took the more “inferior” clay muddy interlayer as the research object, and shear creep experiments under different normal stress levels were carried out by means of hierarchical loading. This paper focuses on the variation law of creep curve and its long-term strength in the clay-type muddy interlayer under different normal stresses. The results showed that the creep characteristics of clay-type muddy interlayer were obvious: at the same normal stress level, instantaneous d

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Zehr, Jackie D., Jessa M. Buchman-Pearle, Tyson A. C. Beach, Chad E. Gooyers, and Jack P. Callaghan. "Regulating Movement Frequency and Speed: Implications for Lumbar Spine Load Management Strategies Demonstrated Using an In Vitro Porcine Model." Journal of Applied Biomechanics 37, no. 6 (2021): 538–46. http://dx.doi.org/10.1123/jab.2021-0148.

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The relationship between internal loading dose and low-back injury risk during lifting is well known. However, the implications of movement parameters that influence joint loading rates—movement frequency and speed—on time-dependent spine loading responses remain less documented. This study quantified the effect of loading rate and frequency on the tolerated cumulative loading dose and its relation to joint lifespan. Thirty-two porcine spinal units were exposed to biofidelic compression loading paradigms that differed by joint compression rate (4.2 and 8.3 kN/s) and frequency (30 and 60 cycles

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Aqueveque, Pablo, Macarena Díaz, Britam Gomez, et al. "Embedded Electronic Sensor for Monitoring of Breathing Activity, Fitting and Filter Clogging in Reusable Industrial Respirators." Biosensors 12, no. 11 (2022): 991. http://dx.doi.org/10.3390/bios12110991.

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Millions of workers are required to wear reusable respirators in several industries worldwide. Reusable respirators include filters that protect workers against harmful dust, smoke, gases, and vapors. These hazards may cause cancer, lung impairment, and diseases. Respiratory protection is prone to failure or misuse, such as wearing respirators with filters out of service life and employees wearing respirators loosely. Currently, there are no commercial systems capable of reliably alerting of misuse of respiratory protective equipment during the workday shifts or provide early information about

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Yang, Miao, Xiaobo Liu, Zhiyi Zhang, and Yulai Song. "Stress Corrosion Behavior of AM50Gd Magnesium Alloy in Different Environments." Metals 9, no. 5 (2019): 616. http://dx.doi.org/10.3390/met9050616.

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A new type of high strength corrosion-resistant magnesium alloy was prepared by adding 1% rare earth Gd to AM50 and then treated with hot extrusion method. The stress corrosion properties of the new materials in air, pure water, 0.5 mol/L NaCl, and 0.5 mol/L Na2SO4 solution were studied by the slow strain rate tensile (SSRT) test, in situ open circuit potential test, Tafel curve test, stereomicroscope, SEM, and EDS. The results showed the following. The stress corrosion sensitivity of the material in different environments was Na2SO4 > NaCl > distilled water > air. According to the Ta

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