The normal depth is an essential parameter for the design, operation, and maintenance of open channels. The circular, city-gate crossing and egg-shaped sections are often used in non-pressure tunnels in hydraulic engi...
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The normal depth is an essential parameter for the design, operation, and maintenance of open channels. The circular, city-gate crossing and egg-shaped sections are often used in non-pressure tunnels in hydraulic engineering, agricultural irrigation, and sewerage works. However, the equations governing the normal depth in various sections are complicated implicit transcendental equations. In order to improvements the solutions for normal depth in multiple sections of tunnels, a function model is first established for the geometric features of various sections using the mathematical transform method and while considering non-dimensional parameters. Then implement the revised PSO algorithms in MATLAB, and establish three right solution's formulas for the normal depths in different non-pressure tunnel sections through optimization. The error analysis results and project cases show that the established formula has broad applicability. The maximum relative errors of the formula for normal depths are less than 0.07%, 0.04%, and 0.07% in circular, city-gate crossing, and egg-shaped sections, respectively, which are more accurate than the existing formulas. The results of this research may be useful in design, operation, and maintenance in tunnel engineering.
The paper deals with spectral analysis of two selected roadway bridges loaded with traffic seismicity due to road and railway traffic. The frequency parameters were obtained from computing model via FEM software. Spec...
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The paper deals with spectral analysis of two selected roadway bridges loaded with traffic seismicity due to road and railway traffic. The frequency parameters were obtained from computing model via FEM software. Spectral parameters comparison between theoretical and experimental results was realised. The traffic means effects on soil in frequency and amplitude domain was necessary for bridge spectral analysis.
作者：
Veronika ValaškováJozef MelcerGabriela LajčákováVeronika Valašková
Faculty of Civil Engineering Department of Structural MechanicsUniverzitná 8215/1 010 26 Žilina Slovakia Jozef Melcer
Faculty of Civil Engineering Department of Structural MechanicsUniverzitná 8215/1 010 26 Žilina Slovakia Gabriela Lajčáková
Faculty of Civil Engineering Department of Structural MechanicsUniverzitná 8215/1 010 26 Žilina Slovakia
Moving load effect on pavements is currently and frequently analyzed task in engineering practice. Random road profile represents the source of kinematical excitation of vehicle. Vehicle response and its dynamic effec...
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Moving load effect on pavements is currently and frequently analyzed task in engineering practice. Random road profile represents the source of kinematical excitation of vehicle. Vehicle response and its dynamic effect on pavements can be analyzed by numerical or by experimental way. The analyses can by carried out in time or in frequency domain. But from complex point of view both analyses are needed. The submitted paper is dedicated to the numerical simulation of motion of vehicle quarter model along random road profile and to the analysis of vehicle response in time and in frequency domain.
Background: Low back pain (LBP) is a common problem that can contribute to motor dysfunction. Previous studies reporting the changes in kinematic characteristics caused by LBP present conflicting results. This study a...
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Background: Low back pain (LBP) is a common problem that can contribute to motor dysfunction. Previous studies reporting the changes in kinematic characteristics caused by LBP present conflicting results. This study aimed to apply the multisegmental spinal model to investigate the kinematic changes in patients with lumbar disc herniation (LDH) during five activities of daily living (ADLs). Methods: Twenty-six healthy subjects and 7 LDH patients participated in this study and performed level walking, stair climbing, trunk flexion, and ipsilateral and contralateral pickups. The angular displacement of the thorax, upper lumbar (ULx), lower lumbar (LLx), pelvis, hip, and knee was calculated using a modified full-gait-model in the AnyBody modeling system. Results: In the patient group, the ULx almost showed no sagittal angular displacement while the LLx remained part of the sagittal angular displacement during trunk flexion and the two pickups. In the two pickups, pelvic tilt and lower extremities' flexion increased to compensate for the deficiency in lumbar motion. LDH patients exhibited significantly less pelvic rotation during stair climbing and greater pelvic rotation in other ADLs, except in contralateral pickup. In addition, LDH patients demonstrated more antiphase movement in the transverse plane between ULx and LLx, during level walking and stair climbing, between thorax and pelvis in the two pickups. Conclusions: LDH patients mainly restrict the motion of LLx and ULx in the spinal region during the five ADLs. Pelvic rotation is an important method to compensate for the limited lumbar motion. Furthermore, pelvic tilt and lower extremities' flexion increased when ADLs were quite difficult for LDH patients.
With the development of computer science and technology and the further progress of IC fabrication,GPUaccelerating computer systems are more and more widely used to provide higher performance on HPCs(High Performance ...
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ISBN:
(纸本)9781509011964
With the development of computer science and technology and the further progress of IC fabrication,GPUaccelerating computer systems are more and more widely used to provide higher performance on HPCs(High Performance Computers) and even regular desktop and laptop *** the same time,the Internet era and the rise of mobile Internet produced PBs of *** data are useless until carefully chosen,filtered,and analyzed,so that Big Data became a million class business very *** the higher and more parallel GPU computing resources to solve the problems in current Big Data is a new *** this paper a model based on membrane computing to process big data is proposed to explain the link between big data and GPU-acceleration.
the concept lattice is adapted to be the exchange information model and it can be changed based on sub-lattice was proposed in this paper, and the new concept lattice was composed of a series of sub-lattice which was ...
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the concept lattice is adapted to be the exchange information model and it can be changed based on sub-lattice was proposed in this paper, and the new concept lattice was composed of a series of sub-lattice which was isomorphic to the original related sub-lattice, the isomorphic relation and the method to obtain the new concept lattice from the original concept lattice by the new context and the arrow relation was proposed and proved. The association of the upper and the lower sub-lattice based on isomorphic sub-lattice was shown. At last, we analysis that concept lattice was adapted to be the middle layer for exchange information because of a series of inner, advanced property consisted with distributed, parallel algorithm.
Cloud computing is a development and integration result of distributed processing, parallel processing and grid computing technologies. It helps the enterprise switch the resources according to the applications, ...
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ISBN:
(纸本)9781424472796
Cloud computing is a development and integration result of distributed processing, parallel processing and grid computing technologies. It helps the enterprise switch the resources according to the applications, accesses computer and storage systems according to the demand. And it provides a new computing model for enterprise informatization. This paper introduces items reaited to cloud computing: the concept, the theory, cloud level, the main form, the security analysis, as well as cloud storage.
This paper presents an alternative method to parallelize programs, better suited to manycore processors than actual operating system-/API-based approaches like OpenMP and MPI. The method relies on a parallelizing hard...
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This paper presents an alternative method to parallelize programs, better suited to manycore processors than actual operating system-/API-based approaches like OpenMP and MPI. The method relies on a parallelizing hardware and an adapted programming style. It frees and captures the instruction-level parallelism (ILP). A many-core design is presented in which cores are multithreaded and able to fork new threads. The programming style is based on functions. The hardware creates a concurrent thread at each function call. The programming style and the hardware create the conditions to free the ILP, by eliminating the architectural dependences between a call and its continuation after return. We illustrate the method on a sum reduction, a matrix multiplication and a sort. We measure the ILP of the parallel runs and show that it is high enough to feed thousands of cores because it increases with data size. We compare our method to pthread parallelization, showing that (1) our parallel execution is deterministic, (2) our thread management is cheap, (3) our parallelism is implicit, and (4) our method parallelizes functions and loops. Implicit parallelism makes parallel code easy to write and read. Deterministic parallel execution makes parallel code easy to debug.
20世纪中叶以来,美国图书馆计算机应用与网络的发展可以用三个浪潮(主机浪潮main-frame computing with heavily centralized proprietary data processing and storage、用户/服务浪潮client/servercomputing allowing decentralizatio...
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20世纪中叶以来,美国图书馆计算机应用与网络的发展可以用三个浪潮(主机浪潮main-frame computing with heavily centralized proprietary data processing and storage、用户/服务浪潮client/servercomputing allowing decentralization of data processing and storage、网络中心浪潮Network-Centric computing model)和四个阶段来概括:
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