16,152 research outputs found
Cuan wen cong ke jia bian
No full textBian zhe cong Yunnan, Guizhou sou ji dang di Luoluo wen (ji Yi wen) zhi bei ke 10 zhong, jia shang Tan Xichou cong Sichuan xi bu sou ji de "Yi ren zuo dao chang yong jing" 1 zhong, gong 11 zhong bian cheng ci shu. Cong Tang chao qi cheng "Luoluo" wei "cuan", gu min
Xue hai tang cong ke
No full textShou lu le guang zhou ren shi(han yu xian)Zhu shu, You guan guang zhou li shi wen hua de zhu shu ji guang zhou ban cong shu;Shi jian xia xian wei 1911 nian, Ge bie men lei yan zhi min guo;Di yu bao kuo le qing dai zhong qi guang zhou fu suo xia nan hai, Fan yu, Shun de, Dong guan, Cong hua, Long men, Zeng cheng, Xin hui, Xiang shan, San shui, Xin ning, Xin an, Qing yuan, Hua xian, Yi ji xiang gang, Ao men, Fo gang, Chi x
Skeletal kinematics of the midtarsal joint during walking: Midtarsal joint locking revisited
No full textThe kinematics of the human foot complex have been investigated to understand the weight bearing mechanism of the foot. This study aims to investigate midtarsal joint locking during walking by non-invasively measuring the movements of foot bones using a high-speed bi-planar fluoroscopic system. Eighteen healthy subjects volunteered for the study; the subjects underwent computed tomography imaging and bi-planar radiographs of the foot in order to measure the three-dimensional (3D) midtarsal joint kinematics using a 2D-to-3D registration method and anatomical coordinate system in each bone. The relative movements on bone surfaces were also calculated in the talonavicular and calcaneocuboid joints and quantified as surface relative velocity vectors on articular surfaces to understand the kinematic interactions in the midtarsal joint. The midtarsal joint performed a coupled motion in the early stance to pronate the foot to extreme pose in the range of motion during walking and maintained this pose during the mid-stance. In the terminal stance, the talonavicular joint performed plantar-flexion, inversion, and internal rotation while the calcaneocuboid joint performed mainly inversion. The midtarsal joint moved towards an extreme supinated pose, rather than a minimum motion in the terminal stance. The study provides a new perspective to understand the kinematics and kinetics of the movement of foot bones and so-called midtarsal joint locking, during walking. The midtarsal joint continuously moved towards extreme poses together with the activation of muscle forces, which would support the foot for more effective force transfer during push-off in the terminal stance. (C) 2019 Elsevier Ltd. All rights reserved.
Comparison study of two semi-active hybrid energy storage systems for hybrid electric vehicle applications and their experimental validation
No full textBoth the battery/supercapacitor (SC) and SC/battery are two common semi-active configurations of hybrid energy storage systems (HESSs) in hybrid electric vehicles, which can take advantage of the battery’s and supercapacitor’s respective characteristics, including the energy ability, power ability and the long lifetime. To explore in depth the characteristics and applicability of the two kinds of HESS, an analysis and comparison study is proposed in this paper. Based on the data collected from public transit hybrid electric bus (PTHEB) with battery-only on board energy storage, the range and distribution probability of electric power/energy demand is comprehensively statistically analyzed with the decomposing and normalizing methods. Accordingly, the performance of each topology under different parameter matching conditions but same mass, volume and cost values with battery-only energy storage, are presented and compared quantitatively. The results show that both HESS configurations can meet the electric power demand of the hybrid electric vehicle (HEV) through reasonable design. In particular, the SC/battery can make better use of the SC features resulting in high efficiency and long life cycles compared with the battery/SC. Equally, it proves that the SC/battery topology is a better choice for the HEV. Finally, an experimental validation of a real HEV is carried out, which indicated that a 7% fuel economy improvement can be achieved by a SC/battery system compared with battery-only topology
Author Correction: Human fingerprint in global weather
No full textIn the version of this News & Views originally published, the ref. 5 author surnames Meihnausen, Fisher and Szekely were spelled incorrectly; they should have been spelled Meinshausen, Fischer and Székely, respectively. This has now been corrected. © 2020, Springer Nature Limited.11Nsciessciscopu
Imaging the dynamics of soft materials at microscale and nanoscale
No full textSoft materials are materials that are soft. They can usually be deformed easily by thermal stresses or thermal fluctuations at about room temperature, which makes their dynamic behaviors of great interest and importance. In this thesis, imaging tools such as bright-field and dark-field optical microscopes and liquid-phase transmission electron microscope, have been utilized to capture the dynamics of three distinct yet typical soft materials in situ at different length scales: colloids, polymeric chains, and nanobubbles. While conventional interests have been focused on the equilibrium structures and properties of soft materials, we explore their non-equilibrium dynamics under external driving forces or agitations, such as electric fields, chemical gradients, and electron beam irradiation. Image processing, single particle tracking, and statistical analysis are combined to study the rich phenomena we observed.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-08-01The student, Cong Xu, accepted the attached license on 2020-07-15 at 09:15.The student, Cong Xu, submitted this Dissertation for approval on 2020-07-15 at 09:18.This Dissertation was approved for publication on 2020-07-16 at 15:49.DSpace SAF Submission Ingestion Package generated from Vireo submission #15627 on 2020-10-02 at 15:50:50Made available in DSpace on 2020-10-07T22:49:59Z (GMT). No. of bitstreams: 3
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Previous issue date: 2020-07-16Embargo set by: Seth Robbins for item 116334
Lift date: 2022-10-07T22:50:13Z
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CONG AND HWANG UCLA CSD TR-950001 Abstract Simultaneous Depth and Area Minimization in LUT-based FPGA Mapping
No full textIn this paper, we present an improvement of the FlowMap algorithm, named CutMap, which combines depth and area minimization in the mapping process by computing min-cost min-height K-feasible cuts for nodes which are on critical paths for depth minimization and computing min-cost K-feasible cuts for nodes which are not on any critical path for area minimization. CutMap guarantees depth-optimal mapping solutions in polynomial time as the FlowMap algorithm but uses considerably fewer LUTs. We have implemented CutMap and tested it on the MCNC logic synthesis benchmarks. For depth-optimal mapping solutions, CutMap uses 20 % fewer K-LUTs than FlowMap without post-processing, and uses 13 % fewer K-LUTs than FlowMap when post-processing operations for area minimization are applied to both solutions. When targeting for Xilinx X3000 FPGA family, CutMap uses 11 % fewer CLBs than FlowMap. We also tested CutMap followed by the depth relaxation routines in FlowMap_r algorithm, which achieves area minimization by depth relaxation. CutMap followed FlowMap_r performs better than FlowMap_r. 1 CONG AND HWANG UCLA CSD TR-95000
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