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Parasitic rotation evaluation and avoidance of 3-UPU parallel mechanism
Haibo QU, Yuefa FANG, Sheng GUO
《机械工程前沿(英文)》 2012年 第7卷 第2期 页码 210-218 doi: 10.1007/s11465-012-0317-4
Based on the prototype of 3-UPU (universal-prismatic-universal joint) parallel mechanism proposed by Tsai [ ], the parasitic rotation evaluation is performed and calculated the bound of instability of SNU Seoul National University 3-UPU parallel mechanism. Through analysis of the terminal constraint system of the 3-UPU parallel mechanism, the equation about the parasitic rotation and limited clearance is presented. Then the norm of possible parasitic rotation is employed to evaluate the mechanism stability with limited clearance. The higher this number the worst is the pose, the lower it is the best it is. And the contour atlas of parasitic rotation is obtained, which can be used for further analysis and design. With the practice experiment result of SUN 3-UPU parallel mechanism, we find it’s bound of instability, which indicates there will appear the parasitic rotation when the number exceeds the bound. Finally, the method for avoidance of possible parasitic motions is presented by adding redundantly actuated limbs.
关键词: parallel mechanism 3-UPU (universal-prismatic-universal joint) parasitic motions limited clearance redundantly actuated limbs
A rolling 3-UPU parallel mechanism
Zhihuai MIAO, Yan’an YAO, Xianwen KONG
《机械工程前沿(英文)》 2013年 第8卷 第4期 页码 340-349 doi: 10.1007/s11465-013-0282-6
A novel rolling mechanism is proposed based on a 3-UPU parallel mechanism in this paper. The rolling mechanism is composed of two platforms connected by three UPU (universal-prismatic-universal) serial-chain type limbs. The degree-of-freedom of the mechanism is analyzed using screw theory. Gait analysis and stability analysis are presented in detail. Four rolling modes of the mechanism are discussed and simulated. The feasibility of the rolling mechanism is verified by means of a physical prototype. Finally, its terrain adaptability is enhanced through planning the rolling gaits.
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《医学前沿(英文)》 2017年 第11卷 第4期 页码 471-479 doi: 10.1007/s11684-017-0602-z
Several universal influenza virus vaccine candidates based on eliciting antibodies against the hemagglutinin stalk domain are in development. Typically, these vaccines induce responses that target group 1 or group 2 hemagglutinins with little to no cross-group reactivity and protection. Similarly, the majority of human anti-stalk monoclonal antibodies that have been isolated are directed against group 1 or group 2 hemagglutinins with very few that bind to hemagglutinins of both groups. Here we review what is known about the human humoral immune response to vaccination and infection with H7 subtype influenza viruses on a polyclonal and monoclonal level. It seems that unlike vaccination with H5 hemagglutinin, which induces antibody responses mostly restricted to the group 1 stalk domain, H7 exposure induces both group 2 and cross-group antibody responses. A better understanding of this phenomenon and the underlying mechanisms might help to develop future universal influenza virus vaccine candidates.
关键词: universal influenza virus vaccine hemagglutinin stalk H7N9
A feasibility study on the design and walking operation of a biped locomotor via dynamic simulation
null
《机械工程前沿(英文)》 2016年 第11卷 第2期 页码 144-158 doi: 10.1007/s11465-016-0391-0
A feasibility study on the mechanical design and walking operation of a Cassino biped locomotor is presented in this paper. The biped locomotor consists of two identical 3 degrees-of-freedom tripod leg mechanisms with a parallel manipulator architecture. Planning of the biped walking gait is performed by coordinating the motions of the two leg mechanisms and waist. A three-dimensional model is elaborated in SolidWorks® environment in order to characterize a feasible mechanical design. Dynamic simulation is carried out in MSC.ADAMS® environment with the aims of characterizing and evaluating the dynamic walking performance of the proposed design. Simulation results show that the proposed biped locomotor with proper input motions of linear actuators performs practical and feasible walking on flat surfaces with limited actuation and reaction forces between its feet and the ground. A preliminary prototype of the biped locomotor is built for the purpose of evaluating the operation performance of the biped walking gait of the proposed locomotor.
关键词: feasibility study biped locomotor biped walking mechanical design dynamic simulation tripod leg mechanism 3-UPU parallel manipulator
Design of a novel RTD-based three-variable universal logic gate
Mao-qun YAO,Kai YANG,Cong-yuan XU,Ji-zhong SHEN
《信息与电子工程前沿(英文)》 2015年 第16卷 第8期 页码 694-699 doi: 10.1631/FITEE.1500102
关键词: Resonant tunneling diode (RTD) Threshold logic gate Reed-Muller expansion Universal logic gate
Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution
Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong
《化学科学与工程前沿(英文)》 2021年 第15卷 第5期 页码 1134-1146 doi: 10.1007/s11705-020-2014-x
关键词: hydrogen evolution reaction transition metal phosphides pH-universal vanadium doping carbon fiber paper
Yulu Wang, Dan Hu, Yanling Wu, Tianlei Ying
《医学前沿(英文)》 2020年 第14卷 第2期 页码 149-159 doi: 10.1007/s11684-020-0764-y
关键词: influenza virus neutralizing antibody hemagglutinin globular head region trimeric interface
Shen LIU, Shengzhe SHANG, Xuezhen YANG, Huihua ZHANG, Dan LU, Ning LI
《农业科学与工程前沿(英文)》 2018年 第5卷 第3期 页码 382-389 doi: 10.15302/J-FASE-2018211
The mammary gland provides a novel method for producing recombinant proteins in milk of transgenic animals. A key component in the technology is the construction of an efficient milk expression vector. Here, we established a simple method to construct a milk expression vector, by a combination of homologous recombination and digestion-ligation. Our methodology is expected to have the advantages of both plasmid and bacterial artificial chromosome (BAC) vectors. The BAC of mouse whey acidic protein gene (mWAP) was modified twice by homologous recombination to produce a universal expression vector, and the human lysozyme gene (hLZ) was then inserted into the vector by a digestion-ligation method. The final vector containing the 8.5 kb mWAP 5′ promoter, 4.8 kb hLZ genomic DNA, and 8.0 kb mWAP 3′ genomic DNA was microinjected into pronuclei of fertilized mouse embryos, to successfully generate two transgenic mouse lines that expressed recombinant human lysozyme (rhLZ) in milk. The highest expression level of rhLZ was 0.45 g·L−1, and rhLZ exhibited the same antibacterial activity as native hLZ. Our results have provided a simple approach to construct a universal milk expression vector, and demonstrated that the resulting vector regulates the expression of hLZ in milk.
关键词: BAC recombinant methods gene expression human lysozyme transgenic mice milk expression vector
基于RTD三变量通用逻辑门的函数综合算法 Article
Mao-qun YAO, Kai YANG, Ji-zhong SHEN, Cong-yuan XU
《信息与电子工程前沿(英文)》 2017年 第18卷 第10期 页码 1654-1664 doi: 10.1631/FITEE.1601730
XU Zhongming, HUANG Ping
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 474-477 doi: 10.1007/s11465-007-0082-y
关键词: coefficient dissipation mechanism universal adhesive interfacial Independent Oscillator
Eugene Averin
《工程(英文)》 2017年 第3卷 第6期 页码 888-891 doi: 10.1016/j.eng.2017.12.004
Monte Carlo simulation of the diffusion-limited aggregating process of particle suspension systems
Jiajing XU, Lin ZHANG, Yongjian TANG, Wei DAI, Wenwen SHAN,
《化学科学与工程前沿(英文)》 2010年 第4卷 第3期 页码 270-274 doi: 10.1007/s11705-009-0273-7
关键词: cluster-cluster aggregation distribution function relationship process universal
临床诊断标准实施和全城症状排查对武汉新冠病毒肺炎疫情防控的效果评价 Article
魏永越, 魏良敏, 姜玥, 沈思鹏, 赵杨, 郝元涛, 杜志成, 唐金陵, 张志杰, 姜庆五, 李立明, 陈峰, 沈洪兵
《工程(英文)》 2020年 第6卷 第10期 页码 1141-1146 doi: 10.1016/j.eng.2020.04.008
通过一个等价雷诺数揭示层流到湍流的转捩区域 Article
陈晓东
《工程(英文)》 2019年 第5卷 第3期 页码 576-579 doi: 10.1016/j.eng.2018.09.013
Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulence—is one of the most important research subjects in the history of engineering. Even for pipe flow, predicting the onset of turbulence requires sophisticated instrumentation and/or direct numerical simulation, based on observing the instantaneous flow structure formation and evolution. In this work, a local Reynolds number equivalence γ (ratio of local inertia effect to viscous effect) is seen to conform to the Universal Law of the Wall, where γ = 1 represents a quantitative balance between the abovementioned two effects. This coincides with the wall layer thickness (y+ = 1, where y+ is the dimensionless distance from the wall surface defined in the Universal Law of the Wall). It is found that the characteristic of how the local derivative of γ against the local velocity changes with increasing velocity determines the onset of turbulence. For pipe flow, γ ≈ 25, and for plate flow, γ ≈ 151.5. These findings suggest that a certain combination of γ and velocity (nonlinearity) can qualify the source of turbulence (i.e., generate turbulent energy). Similarly, a re-evaluation of the previous findings reveals that only the geometrically narrow domain can act locally as the source of turbulence, with the rest of the flow field largely being left for transporting and dissipating. This understanding will have an impact on the future large-scale modeling of turbulence.
Single and joint effects of HHCB and cadmium on zebrafish (
Lei ZHANG, Jing AN, Qixing ZHOU
《环境科学与工程前沿(英文)》 2012年 第6卷 第3期 页码 360-372 doi: 10.1007/s11783-011-0353-z
关键词: 1 3 4 6 7 8-hexahydro-4 6 6 7 8 8-hexamethylcyclopenta-gamma-2-benzopyran (HHCB) cadmium (Cd) antioxidant biomarker feculent water containing bedloads
标题 作者 时间 类型 操作
Parasitic rotation evaluation and avoidance of 3-UPU parallel mechanism
Haibo QU, Yuefa FANG, Sheng GUO
期刊论文
Universal influenza virus vaccines: what can we learn from the human immune response following exposure
null
期刊论文
A feasibility study on the design and walking operation of a biped locomotor via dynamic simulation
null
期刊论文
Design of a novel RTD-based three-variable universal logic gate
Mao-qun YAO,Kai YANG,Cong-yuan XU,Ji-zhong SHEN
期刊论文
Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution
Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong
期刊论文
Recent advances in “universal” influenza virus antibodies: the rise of a hidden trimeric interface in
Yulu Wang, Dan Hu, Yanling Wu, Tianlei Ying
期刊论文
Construction of a universal recombinant expression vector that regulates the expression of human lysozyme
Shen LIU, Shengzhe SHANG, Xuezhen YANG, Huihua ZHANG, Dan LU, Ning LI
期刊论文
Calculating frictional force with considering material microstructure and potential on contact surfaces
XU Zhongming, HUANG Ping
期刊论文
Monte Carlo simulation of the diffusion-limited aggregating process of particle suspension systems
Jiajing XU, Lin ZHANG, Yongjian TANG, Wei DAI, Wenwen SHAN,
期刊论文