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Experiment for Determination of Dry-Laid Stone Armour Layer Thickness of Rubble Mound Breakwaters

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China Ocean Engineering 1995年第1期10卷 107-113页

作者： Sun, Jingshi zhu, yiming

Through hydraulic model experiment and site investigation, this paper has derived a calculation formula of dry-laid stone armour layer thickness of rubble mound breakwaters for fishery harbours. The influences of the friction force between stone blocks and the variations of wave length or period and water depth are considered in the formula. The calculated results of several existing structures are in good agreement with field data. This formula is more practical than those ever published both at home and abroad, and has been adoptted by the technical standards of aquatic projects published by the Ministry of Agriculture of China. It is applicable for the calculation of dry-laid stone armour layer of breakwater for small- or medium-size harbours.

关键词： calculation dry-laid stone armour rubble mound breakwater

Bio-inspired Design and Inverse Kinematics Solution of an Omnidirectional Humanoid Robotic Arm with Geometric and Load Capacity Constraints

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Journal of Bionic Engineering 2024年第2期21卷 778-802页

作者： Zhichao zhu Zirong Luo yiming zhu Tao Jiang Minghai Xia Shanjun Chen Boyu Jin College of Intelligence Science and Technology National University of Defense TechnologyChangshaChina

Inspired by the driving muscles of the human arm,a 4-Degree of Freedom(DOF)concentrated driving humanoid robotic arm is proposed based on a spatial double parallel four-bar *** four-bar mechanism design reduces the inertia of the elbow-driving unit and the torque by 76.65%and 57.81%,*** the human pose regulation strategy that the human arm picks up a heavy object by adjusting its posture naturally without complicated control,the robotic arm features an integrated position-level closed-form inverse solution method considering both geometric and load capacity *** method consists of a geometric constraint model incorporating the arm angle(φ)and the Global Configuration(GC)to avoid joint limits and singularities,and a load capacity model to constrain the feasible domain of the arm ***,trajectory tracking simulations and experiments are conducted to validate the feasibility of the proposed inverse solution *** simulated maximum output torque,maximum output power and total energy consumption of the robotic arm are reduced by up to 2.0%,13.3%,and 33.3%,*** experimental results demonstrate that the robotic arm can bear heavy loads in a human-like posture,effectively reducing the maximum output torque and energy consumption of the robotic arm by 1.83%and 5.03%,respectively,while avoiding joints beyond geometric and load capacity *** proposed design provides a high payload–weight ratio and an efficient pose control solution for robotic arms,which can potentially broaden the application spectrum of humanoid robots.

关键词： Humanoid robotic arm Bio-inspired design Inverse kinematics solution Load capacity constraint Geometric constraint

Researching on quadrature conversion structures For an UWB demonstrative receiver

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Journal of Systems Engineering and Electronics 2006年第4期17卷 875-882页

作者： zhu Canyan Wang yiming Yang Huibao Liu Jiasheng School of Electronics and Information Engineering Sonchow Univ. Suzhou 215021 P.R.China

Some structures of digital quadrature AD conversion for soft-ware-defined radio （SDR） systems are studied. Their performances and affections on the SDR systems are also analyzed. Two generalized quadrature AD schemes are proposed. In one of them, the AD sampling speed can be reduced by 2 times; and in the other both the output data rate of every channel and AD sampling speed can be lowered by paralleling the digital quadrature filtering structure. These structures can be also easily implemented into modules, and the polyphase filters can be flexibly realized by VHDL language based one chip of FPGA. To assess the proposed schemes, their applications to a particular ultra wideband （UWB） demonstrative receiver system are introduced. Some experimental results are also given. It is shown that the generalized quadrature AD structures are reliable and feasible for its module design, and performances are improved obviously for its better performance to price ratio.

关键词： software defined radio (SDR). digital auadrature sonversion nolvohase filtering ultra wideband (UWB)

Thickness properties hexagonal and temperature dependent electrical of ZrS2 thin films directly grown on boron nitride

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Nano Research 2016年第10期9卷 2931-2937页

作者： yiming zhu Xinsheng Wang Mei Zhang Congzhong Cai Liming Xie State Key Laboratory of Coal Mine Disaster Dynamics and Control Department of Applied Physics Chongqing University Chongqing 400044 China CAS Ke7 La6orator7 of Standardization and Measurement for Nanotechnology CA5 Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing I00190 China

Two-dimensional ZrS2 materials have potential for applications in nanoelectronics because of their theoretically predicted high mobility and sheet current density. Herein, we report the thickness and temperature dependent transport properties of ZrS2 multilayers that were directly deposited on hexagonal boron nitride （h-BN） by chemical vapor deposition. Hysteresis-free gate sweeping, metal- insulator transition, and T-γ （γ- 0.82-1.26） temperature dependent mobility were observed in the ZrS2 films.

关键词： chemical vapor deposition two-dimensional materials ZrS2 electrical transport mobility

Moxa Wool in Different Purities and Different Growing Years Measured by Terahertz Spectroscopy

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Plant Phenomics 2022年第1期4卷 235-246页

作者： Yongni Shao Di zhu Yutian Wang Zhi zhu Wenchao Tang Zhengan Tian Yan Peng yiming zhu Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 20009China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China School of Acupuncture-Moxibustion and Tuina Shanghai University of Traditional Chinese MedicineChina Shanghai International Travel Healthcare Center Shanghai Customs District P.R.200335China

Moxa wool is a traditional Chinese herbal medicine,which can warm channels to dispel *** present,there is no unified index to evaluate the purity and growing years of moxa wool in the *** is one of the effective substances in the volatile oil of moxa ***,we characterize the purity and growing years of moxa wool by studying *** chromatography-mass spectrometry(GC-MS)and high-performance liquid chromatography(HPLC)are the methods for monitoring terpineol at present,all of which have defects of complicated procedures.

关键词： wool purity unified

Feature Preserving Parameterization for Quadrilateral Mesh Generation Based on Ricci Flow and Cross Field

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 843-857页

作者： Na Lei Ping Zhang Xiaopeng Zheng yiming zhu Zhongxuan Luo International School of Information Science and Engineering Dalian University of TechnologyDalian116000China School of Mathematical Sciences Dalian University of TechnologyDalian116000China School of Software Technology Dalian University of TechnologyDalian116000China

We propose a newmethod to generate surface quadrilateralmesh by calculating a globally defined parameterization with feature *** the field of quadrilateral generation with features,the cross field methods are wellknown because of their superior performance in feature *** methods based on metrics are popular due to their sound theoretical basis,especially the Ricci flow *** cross field methods’major part,the Poisson equation,is challenging to solve in three dimensions *** it comes to cases with a large number of elements,the computational costs are expensive while the methods based on metrics are on the *** addition,an appropriate initial value plays a positive role in the solution of the Poisson equation,and this initial value can be obtained from the Ricci flow *** we combine the methods based on metric with the cross field *** use the discrete dynamic Ricci flow algorithm to generate an initial value for the Poisson equation,which speeds up the solution of the equation and ensures the convergence of the *** experiments show that our method is effective in generating a quadrilateral mesh for models with features,and the quality of the quadrilateral mesh is reliable.

关键词： Quadrilateral mesh feature preserving Ricci flow cross field

Experimental study on the effect of H2S and SO2 on high temperature corrosion of 12Cr1MoV

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1956-1964页

作者： Hong Xu Shangkun Zhou yiming zhu Weigang Xu Xiaohe Xiong Houzhang Tan Jiangsu Fangtian Electric Technology Co.Ltd. Nanjing 211102China MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China School of Mechanical Engineering Changzhou UniversityChangzhou 213164China

Aiming at the high temperature corrosion in a coal-fired boiler,the effect of H2S and SO2 on the corrosion of 12 CrlMoV under the water wall condition has been investigated by *** results indicate that H2 S can promote the corrosion significantly,and the coarse porous oxide film formed cannot stop the progress of *** SO2 presents little effect on the *** main composition of the surface of 12 CrlMoV corrosion products is Fe2 *** H2S in the atmosphere,the corrosion gradually develops into deeper layers by forming FeS,FeO and Fe2 O3 *** corrosion rate is doubled for every 50℃ inerease in temperature at 400-500℃.

关键词： High temperature corrosion Water wall 12Cr1MoV H2S SO2

3D optical measurement of relative displacement for the tuberosities in the shoulder prosthesis

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Science China(Physics,Mechanics & Astronomy) 2011年第4期54卷 647-652页

作者： YAO XueFeng MENG LiBo YU LiuPing zhu yiming JIANG ChunYan Department of Engineering Mechanics Key Laboratory of Applied Mechanics Tsinghua University Beijing 100084 China Beijing Jishuitan Hospital Beijing100035 China

In this paper,a binocular 3-D computer vision measurement system is used to measure the relative displacement for the greater and lesser tuberosities in the shoulder *** basic principles of binocular optical measurement are introduced in detail,and the loading apparatus is designed for external rotation and anteflexion of the shoulder *** the motion of external rotation and anteflexion of the shoulder are measured,and the corresponding displacement values for the greater and lesser tuberosities are *** results will play an important role in evaluating the stability of humeral tuberosity in the shoulder prosthesis.

关键词： 3-D computer vision humeral fractures tuberosities displacement

Terahertz spatial sampling with subwavelength accuracy

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Light(Science & Applications) 2019年第1期8卷 551-552页

作者： Yan Peng yiming zhu Min Gu Songlin zhuang Terahertz Technology Innovation Research Institute Shanghai Key Lab of Modern Optical SystemTerahertz Science Cooperative Innovation CenterUniversity of Shanghai for Science and Technology200093 ShanghaiPeople’s Republic of China

A simple terahertz(THz)spatial sampling method offers kilohertz(kHz)level sampling rates and greatly preserves the energy of a THz pulse,which enables THz imaging detection with a high signal-to-noise ratio,micron-gra... 详细信息

关键词： pulse preserve enable