100 research outputs found
sj-rar-1-pid-10.1177_09544070221135390 – Supplemental material for Electro-hydraulic braking dynamics for pressure demand control of brake-by-wire system
No full textSupplemental material, sj-rar-1-pid-10.1177_09544070221135390 for Electro-hydraulic braking dynamics for pressure demand control of brake-by-wire system by Ligao Jiang, Qin Shi, Yujiang Wei, Yunfeng He, Zejia He and Lin He in Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering</p
Qiong han ling.
No full text白玉江[等]執筆 ; 大連市寺兒溝區大糞合作社集體創作.Play.五幕劇本電子書乃根據《香港版權條例(第528章)》而複製, 並只可在大學圖書館系統內的獨立電子書系統上使用.Bai Yujiang [deng] zhi bi ; Dalian Shi shi er gou ju da fen he zuo she ji ti chuang zuo.Ben dian zi shu nai gen ju "Xianggang ban quan tiao li (Di 528 zhang)" er fu zhi, bing zhi ke zai da xue tu shu guan xi tong nei de du li dian zi shu xi tong shang shi yong.Detailed notes in vernacular field only
Fatigue-based posture and motion predictions
No full textThis dissertation presents two predictive biomechanics studies, fatigue-based posture and motion predictions. For the fatigue-based posture prediction study, the three-compartment
controller fatigue model is integrated with an inverse dynamics optimization routine to
predict the optimal posture, joint fatigue, and endurance time for a box carrying task. A
two-dimensional human model with 10 degrees of freedom is used. For the box carrying task,
the feet are stationary on the ground, and the hand location and box weight are given. The
joint fatigue-based posture prediction formulation considers joint angles, three-compartment
control values, and total box carrying duration (endurance time) as design variables. The
objective is to maximize the total time while adhering to task and fatigue constraints,
including compartment unity constraint, residual capacity constraint, and a novel coupled
failure constraint. The optimization predicts the optimal posture, joint torque, endurance
time, joint fatigue progression, and joint failure conditions. The novel joint fatigue-based
formulation suggests the optimal posture to maximize endurance time with a given box weight.
The simulation is efficient and provides optimal results in about 5 seconds of CPU time on a
regular computer.
The fatigue-based motion prediction study investigates the progression of
fatigue and forecasts the optimal motion trajectory in a repetitive lifting task. The lifting
problem is mathematically formulated as an optimization problem to minimize dynamic effort
and joint acceleration subject to physical and task-specific constraints. The design variables
include control points that determine joint angle profiles using quartic B-splines. Additionally,
profiles of the dimensions of the three and four compartments for spinal, shoulder, elbow,
hip, and knee joints are treated as additional design variables. The study involves numerical
simulations and experiments, using a 20 kg box as an external load for repetitive lifting.
Simulation outcomes include detailed joint angle profiles, joint torques, and the progression
of joint fatigue. The profiles of joint angles and torques follow distinct periodic patterns.
Simulation results suggest a maximum of 11 (3CC) and 13 (4CCr) lifting cycles before the
repetitive lifting task with a 20 kg box becomes unfeasible. Notably, these projected outcomes
match observations from the experiments (predicted 13 cycles). Fatigue-based posture and
motion predictions have significant contributions for ergonomic design and injury prevention
in workplace
Cube2sph : a toolkit enabling flexible and accurate continental-scale seismic wave simulations using the SPECFEM3D_Cartesian package
No full textTo enable flexible and accurate seismic wave simulations at continental scales (10°−60°) based on the spectral-element method using the open-source SPECFEM3D_Cartesian package, we develop a toolkit, Cube2sph, that allows the generation of customized spherical meshes that account for the Earth's curvature. This toolkit enables the usage of the perfectly matched layer (PML) absorbing boundary condition even when the artificial boundaries do not align with the coordinate axes. A series of numerical experiments are presented to validate the effectiveness of this toolkit. From these numerical experiments, we conclude that (1) continental-scale seismic wave simulations, especially surface wave simulations, can be more efficiently performed without the loss of accuracy by truncating the mesh at an appropriate depth, (2) curvilinear-grid PML can be used to effectively suppress artificial reflections for seismic wave simulations at continental scales, and (3) the Earth's spherical geometry needs to be accurately meshed in order to obtain accurate simulation results for study regions larger than 8°.</p
Genome-wide association analysis reveals the common genetic locus for both the typical and atypical polycerate phenotype in Tibetan sheep
No full textSupplementary data for publication: Xiaohong He, Shen Song, Dandan Wang, Xiaofei Chen, Tianzeng Song, Tenzin Lobsang, Tserin Dekyi, Yujiang Wu, Sonam Drawa, Shenjin Lv, Weijun Guan,Yabin Pu, Qianjun Zhao, Xiangchen Li, Lin Jiang, and Yuehui Ma. (2018). Genome-wide association analysis reveals the common genetic locus for both the typical and atypical polycerate phenotype in Tibetan sheep. Anim Genet. 2018 Apr;49(2):142-14
Genome-wide association analysis reveals the common genetic locus for both the typical and atypical polycerate phenotype in Tibetan sheep
No full textSupplementary data for publication: Xiaohong He, Shen Song, Dandan Wang, Xiaofei Chen, Tianzeng Song, Tenzin Lobsang, Tserin Dekyi, Yujiang Wu, Sonam Drawa, Shenjin Lv, Weijun Guan,Yabin Pu, Qianjun Zhao, Xiangchen Li, Lin Jiang, and Yuehui Ma. (2018). Genome-wide association analysis reveals the common genetic locus for both the typical and atypical polycerate phenotype in Tibetan sheep. Anim Genet. 2018 Apr;49(2):142-14
Performance of a hybrid heating system based on enhanced deep borehole heat exchanger and solar energy
No full textAbstractDeep borehole heat exchanger (DBHE) is a closed loop system without the problem of fluid losses, scale formation and corrosion; however, low rock thermal conductivity limits its performance. Enlightened by drilling mud loss in oil and gas industry, here an enhanced DBHE (EDBHE) is proposed by filling materials with much higher thermal conductivity into leakage formation or depleted gas and oil reservoir to enhance the thermal conductivity performance of rock. Solar thermal energy is stored into EDBHE during the non-heating season to replenish the loss of heat energy extracted during the heating season. The results show that average heat mining rate for 20?years operations is, respectively, 3686.5 and 26,384.4?kW for EDBHE filled by ordinary drilling mud and by composite materials with high thermal conductivity. The percentage reduction of heat mining rate for 20?years operations for EDBHE and the hybrid system of geothermal and solar energy are, respectively, 16.1 and 5.8%, indicating that the hybrid system can make the heat mining rate more stable
Genome-wide association analysis reveals the common genetic locus for both the typical and atypical polycerate phenotype in Tibetan sheep
No full textSupplementary data for publication: Xiaohong He, Shen Song, Dandan Wang, Xiaofei Chen, Tianzeng Song, Tenzin Lobsang, Tserin Dekyi, Yujiang Wu, Sonam Drawa, Shenjin Lv, Weijun Guan,Yabin Pu, Qianjun Zhao, Xiangchen Li, Lin Jiang, and Yuehui Ma. (2018). Genome-wide association analysis reveals the common genetic locus for both the typical and atypical polycerate phenotype in Tibetan sheep. Anim Genet. 2018 Apr;49(2):142-14
Performance of Hybrid Single Well Enhanced Geothermal System and Solar Energy for Buildings Heating
No full textThe energy reserves in hot dry rock and hydrothermal systems are abundant in China, however, the developed resources are far below the potential estimates due to immature technology of enhanced geothermal system (EGS) and scattered resources of hydrothermal systems. To circumvent these problems and reduce the thermal resistance of rocks, here a shallow depth enhanced geothermal system (SDEGS) is proposed, which can be implemented by fracturing the hydrothermal system. We find that, the service life for SDEGS is 14 years with heat output of 4521.1 kW. To extend service life, the hybrid SDEGS and solar energy heating system is proposed with 10,000 m(2) solar collectors installed to store heat into geothermal reservoir. The service life of the hybrid heating system is 35 years with geothermal heat output of 4653.78 kW. The novelty of the present work is that the hybrid heating system can solve the unstable and discontinuous problems of solar energy without building additional back-up sources or seasonal storage equipment, and the geothermal thermal output can be adjusted easily to meet the demand of building thermal loads varying with outside temperature
A novel enhanced deep borehole heat exchanger for building heating
No full textDeep borehole heat exchanger (DBHE) technology can be used in various regions due to without dependence on the hot water reservoir. However, its performance can hardly be improved due to poor thermal conductivity of rocks and cement. Here a novel enhanced deep borehole heat exchanger (EDBHE) is first proposed, which applies composite filler, cement and well tube. To depress thermal resistance, graphene is used to mix with ordinary mud and cement respectively to prepare composite filler and composite cement. Especially composite filler is controlled deliberately to flow into leakage formation by adjusting its density, viscosity and back pressure in order to improve the thermal conductivity of surrounding rocks. We find that the extracted thermal output from EDBHE is 1002.34 kW, which is 2.36 times that of DBHE (424.45 kW). EDBHE can be used in low water output zone and difficult recharge zone even dry hole zone with leakage formation, which will increase geothermal heating area substantially
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