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Search Results: 1 - 10 of 105829 matches for " Che Zhang "
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A proposal for benchmark tests for underactuated or compliant hands
D. Che ,W. Zhang
Mechanical Sciences (MS) , 2010, DOI: 10.5194/ms-1-27-2010
Abstract: The concept called gesture-changeable under-actuated (GCUA) function is utilized to improve the dexterities of traditional under-actuated hands and reduce the control difficulties of dexterous hands. Based on GCUA function, a novel mechanical finger by multiple tendons: GCUA-T finger, is designed. The finger uses tendon mechanisms to achieve GCUA function which includes traditional underactuated (UA) grasping motion and special pre-bending (PB, or pre-shaping) motion before UA grasping. Operation principles and force analyses of the fingers are given, and the effect of GCUA function on the movements of a hand is discussed. The finger can satisfy the requirements of grasping and operating with low dependence on control system and low cost on manufacturing expenses, which develops a new way between dexterous hand and traditional under-actuated hand. This paper was presented at the IFToMM/ASME International Workshop on Underactuated Grasping (UG2010), 19 August 2010, Montréal, Canada.
Determination of Eight Sudan Dyes in Chili Powder by UPLC-MS/MS  [PDF]
Lin Wang, Jie Zheng, Zhe Zhang, Tiesong Wang, Baoquan Che
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B033

Sudan dyes are synthetic azo dyes which are widely used in industry. Although they are not allowed in foodstuffs, they have been found contaminating in different food products and their presence is regularly reported. It is assumed that these appearances are due to cross-contamination or adulteration. In this paper, we present a newly developed fast and sensitive method for the quantification of eight Sudan dyes, using liquid-liquid extraction and UPLC-MS/MS analysis. The calibration curves were linear over the range of 0.1-25 mg/kg. Mean recovery for the eight Sudan dyes ranged from 80.7% to 104.4%, and with the inter-day and intra-day precisions ranged from 2.24% to 12.2%. The method was successfully applied in the determination of Sudan dyes in chili powder of 10 samples.

Doped Amorphous Carbon Films Prepared by Liquid Phase Electrodeposition  [PDF]
Canyan Che, Yang Li, Guifeng Zhang, Dewei Deng
Open Journal of Synthesis Theory and Applications (OJSTA) , 2014, DOI: 10.4236/ojsta.2014.31002

It has theoretical significance and practical value to synthetize and modify amorphous carbon films by liquid electro-deposition technique due to its low cost, simple equipment, and better operability in uniform deposition of the films with large-area and complex shape work pieces. This article introduces the research situation of the carbon films prepared by liquid phase electrochemical deposition according to the applied voltage, discusses the influence of experimental parameters on the film properties, and describes possible reaction mechanisms. It summarizes the research progress of amorphous carbon films doped with metal and nonmetals. Finally, existing problems have been demonstrated and suggestions on research hotspots in the future are given.

Analysis of Strain Clamp Failure on 500 kV Transmission Line  [PDF]
Mingcheng Sun, Che Tan, Chaoqun Zhang, Chao Yang, Hongqiang Li
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.64007
In this work, the main reasons for the breakage of 500 kV transmission line are studied. Under low temperature condition, the coverage of the ice results in the disconnection between the aluminum tube and the steel anchor of strain clamp. Using macroscopic analysis, structure stress analysis, force analysis and mechanical property test, the fractured strain clamps are investigated. The crimping of the aluminum tube on the polished rod not on the grooves of the steel anchor leads to the damage of the strain clamps, which is defined as improper crimping. When improper crimping emerges, there will be only friction force between the aluminum tube and the steel anchor without shear force, and the tension of the conductor will be mainly supported by the steel strands which should be supported by both the aluminum tube and steel stands. Therefore, the breaking force of the strain clamp will greatly decrease. The failure analysis helps to promote the proper hydraulic crimping process and the safe operation of the transmission line.
Interannual variability of the Antarctic Circumpolar Current strength based on merged altimeter data
LinLin Zhang,Che Sun,DunXin Hu
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5040-3
Abstract: Interannual variability of the Antarctic Circumpolar Current (ACC) strength is studied in stream-coordinate with twenty-year Absolute Dynamic Topography data from satellite altimetry. The stream-coordinate projection method separates the ACC from adjacent subtropical and subpolar gyres, enabling consideration of the zonal asymmetry of the ACC rather than assuming that the ACC is a purely zonal flow. It is shown that the ACC strength has large interannual variations with two recent peaks around 2000 and 2009. The interannual variability appears mainly in the Indo-Pacific sector of the Southern Ocean and the strongest signal is located south of Australia. The intensification of the westerly wind in 1998 and 2008 appears to cause the strengthening of the ACC via baroclinic processes.
Characterization of Exfoliated Graphite Prepared with the Method of Secondary Intervening
Zhang Shengtao,Gu Anyan,Che Xiangqian
International Journal of Industrial Chemistry , 2011,
Abstract: Exfoliated graphite was prepared with the method of secondary intervening. The results showed that the optimum conditions for the procedure were as follows: mass ratio of nature flake graphite: sulfuric acid: nitric acid: potassium permanganate =1:9:3:0.44 and immersing time in formic acid was 150 minutes. Exfoliated graphite with 300 mL/g exfoliation volume at 900 C was obtained. The prepared sample in the best process condition was characterized by means of scanning electron microscopy (SEM), thermogravimetry and differential thermal analysis (TGA-DTA), infrared ray spectrum (IR) and X-ray diffraction (XRD). After secondary intervening, the layer distance of expandable graphite was enlarged and the boundary layers were broken. Exfoliated graphite was worm-like and graphite layers were held together at their edges, and the expanded domain had a multilayer structure with many diamond-shaped pores. Sulfuric acid, nitric acid and formic acid were intercalated into graphite, and the decomposition of exfoliated graphite at 900 C was mostly derived from graphite intercalation. Crystalline of graphite was damaged because of oxidation intercalation, but the C-C bond was not undermined. Furthermore, oxidation intercalation process and mechanism were discussed.
A new genus of the tribe Issini (Hemiptera, Fulgoromorpha, Issidae) from China
Yanli Che,Yalin Zhang,Yinglun Wang
ZooKeys , 2012, DOI: 10.3897/zookeys.228.3465
Abstract: Macrodarumoides petalinus, a new genus and species of Issidae (Hemiptera) are described based on specimens from Yunnan and Guangxi, China.
Effect of Temperature Dependence on Electrical Characterization of p-n GaN Diode Fabricated by RF Magnetron Sputtering  [PDF]
Thi Tran Anh Tuan, Dong-Hau Kuo, Cheng-Che Li, Guan-Zhang Li
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.69083
Abstract: The p-n junction GaN diodes were all fabricated by sputtering technique with cermet targets for p- and n-type GaN and metal targets for electrodes. The interface of these p-n junction GaN diodes examined by high-resolution transition electron microscopy was clear and distinguishable. Lattice images identified the complete dissolution of Mg into the Ga site. At the room temperature, the diode had the turn-on voltage of 2.2 V, the leakage current of 2.2 × 107 A, the breakdown voltage of 6 V, the barrier height of 0.56 eV, ideality factor of 5.0 by I (current)-V (voltage) test and 5.2 derived from the Cheungs’ method, and series resistance of 560 Ω. These electrical properties were investigated at different testing temperatures from room temperature to 200°C. The temperature dependence in the I-V characteristics of the p-n diodes can be successfully explained on the basis of thermionic-emission mode.
Elliptic flow from a parton cascade
Bin Zhang,Miklos Gyulassy,Che Ming Ko
Physics , 1999, DOI: 10.1016/S0370-2693(99)00456-6
Abstract: The dependence of elliptic flow at RHIC energies on the effective parton scattering cross section is calculated using the ZPC parton cascade model. We show that the v_2 measure of elliptic flow saturates early in the evolution before the hadronization transition to a rather large value ~0.05-0.15 as \sigma_g varies from 2-10 mb and thus is a sensitive probe of the dynamics in the plasma phase.
Effects of initial state fluctuations on jet energy loss
Hanzhong Zhang,Taesoo Song,Che Ming Ko
Physics , 2012, DOI: 10.1088/1742-6596/420/1/012043
Abstract: The effect of initial state fluctuations on jet energy loss in relativistic heavy-ion collisions is studied in a 2+1 dimension ideal hydrodynamic model. Within the next-to-leading order perturbative QCD description of hard scatterings, we find that a jet loses slightly more energy in the expanding quark-gluon plasma if the latter is described by the hydrodynamic evolution with fluctuating initial conditions compared to the case with smooth initial conditions. A detailed analysis indicates that this is mainly due to the positive correlation between the fluctuation in the production probability of parton jets from initial nucleon-nucleon hard collisions and the fluctuation in the medium density along the path traversed by the jet. This effect is larger in non-central than in central relativistic heavy ion collisions and also for jet energy loss that has a linear than a quadratic dependence on its path length in the medium.
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