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Search Results: 1 - 10 of 127009 matches for " LI Datao "
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Geometric Accuracy Design Method of Roller Cavity Surfaces for Net-Shape Rolling Compressor Blades  [PDF]
Qichao Jin, Wenhu Wang, Ruisong Jiang, Zongyan Cai, Datao Li
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105279
Abstract:
The accurate shape of roller cavity surfaces is vital part for net-shape rolling. This paper presents a new design method of roller cavity surfaces with high accuracy for rolling compressor blades based on the geometrical inheritance and evolution of the net-shape profiles. Firstly, a process model of the blade is modeled by adding process allowance and locating basis at the CAD (Comput-er Aided Design) model of the blade to represent the roll formed blade, the process model inherits the net-shape profiles of the blade at the pressure and suction surfaces. Secondly, an algorithm is proposed to discretize a curve to a set of ranked points with the restriction of the maximum chord height, and a new section curve which represents the geometrical feature of the pressure and suction surfaces are distributed on the process model based on the algorithm. Finally, a mapping algorithm is proposed to transform the section curves to the cavity section curves around the roller axis based on the conjugate movement between rollers and blade, and the cavity surfaces are reconstructed based on the transformed section curves. The design method is implemented for the roll-er cavities of a variable cross-section compressor blade, and the accuracy of the designed cavities is checked based on the precision of the roll formed blade by the finite element method. The results reveal that the designed cavities achieved the net-shape precision at pressure and suction surfaces of the blade. The paper provides an effective method for designing rolling cavity surfaces with excellent design quality.
A Comparative Study of Amplitude and Timing Estimation in Experimental Particle Physics using Monte Carlo Simulation  [PDF]
Hongda Xu, Datao Gong, Yun Chiu
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.45B009
Abstract:

Optimal detection of liquid ionization calorimeter signal in experimental particle physics is considered. A few linear and nonlinear approaches for amplitude and arrival time estimation based on the χ2 function are compared in simulation considering the noise sample correlation introduced by the analog pulse shaper. The estimation bias of the first-order approximation, a.k.a linear optimal filtering, is studied and contrasted to those of the second-order as well as the exhaustive search. A gradient-descent technique is presented as an alternative to the exhaustive search with significantly reduced search time and computation complexity. Results from various pulse shapers including the CR-RC2, CR-RC3, and CR2-RC2 are also compared.

A Reference Proteomic Database of Lactobacillus plantarum CMCC-P0002
Li Zhu, Wei Hu, Datao Liu, Wanhong Tian, Gang Yu, Xiankai Liu, Jie Wang, Erling Feng, Xuemin Zhang, Bei Chen, Ming Zeng, Hengliang Wang
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0025596
Abstract: Lactobacillus plantarum is a widespread probiotic bacteria found in many fermented food products. In this study, the whole-cell proteins and secretory proteins of L. plantarum were separated by two-dimensional electrophoresis method. A total of 434 proteins were identified by tandem mass spectrometry, including a plasmid-encoded hypothetical protein pLP9000_05. The information of first 20 highest abundance proteins was listed for the further genetic manipulation of L. plantarum, such as construction of high-level expressions system. Furthermore, the first interaction map of L. plantarum was established by Blue-Native/SDS-PAGE technique. A heterodimeric complex composed of maltose phosphorylase Map3 and Map2, and two homodimeric complexes composed of Map3 and Map2 respectively, were identified at the same time, indicating the important roles of these proteins. These findings provided valuable information for the further proteomic researches of L. plantarum.
Preliminary study on the emissions and pollution control of PCDDs/Fs from crematories in China
中国火葬场二口恶英类污染物排放及减排技术研究

WANG Wei,XIAO Chenglong,LI Datao,JIANG Sipeng,HU Daoqing,
王玮
,肖成龙,李大涛,姜思朋,胡道庆

环境科学学报 , 2006,
Abstract: 对中国某火葬场9具遗体进行了二(口恶)英类污染物排放测试,测试结果表明,烟气中二(口恶)英类物质总浓度为89~350ng·m-3,毒性当量浓度为1.5~5.4ng·m-3;PCDFs的总浓度高于PCDDs的总浓度;以此估算中国2004年火化遗体过程中二(口恶)英类污染物的年排放量为11.2~46.9 g·a-1.通过实验分别研究了布袋除尘器、布袋除尘器加不同厚度的活性炭纤维毡组合对火化遗体烟气中二(口恶)英类污染物的去除效果.结果表明,布袋除尘器去除火化烟气中二(口恶)英类污染物的效率为57.4%;布袋除尘器分别与厚度为5、15mm的活性炭纤维毡组合去除火化烟气中二(口恶)英类污染物的效率分别为64.0%和89.2%.
HYDROGEN INDUCED EMBRITTLEMENT OF ROTOR STEEL 34CrNi3Mo

by KANG Datao,LIAO BO,CHEN Lian,LIU Minzhi,

金属学报 , 1987,
Abstract: The hydrogen-induced embrittlement of rotor steel 34CrNi3Mo was studied by means of slow tensile test of specimens with various hydrogen contents. With the increase of hydrogen content in the steel and the retardation of strain rate, its plasticity drops sharply till almost wholly lost when hydrogen stexceeded 5mL/100g and strain rate was down to 3×10~(-5)s~(-1). The hydrogen content of steel to free flake or hydrogen-induced embrittlement is limited to 2 or 1.48mL/100g respectively. SEM observation shows that the flakes in slow tensile tested specimens revealed their elliptical freckles of sharp boundaries and the micromorphology is transgranular quasi-cleavage consisting of clear tearing ridges and tiny quasi-cleavage planes.
DISCONTINUOUS FINITE ELEMENT METHOD WITH PENALTY FOR ELLIPTIC BOUNDARY VALUE PROBLEMS
求解椭圆边值问题惩罚形式的间断有限元方法

Zhang Tie,Fen Nan,Shi Datao,
张铁
,冯男,史大涛

计算数学 , 2010,
Abstract: In this paper, we present a new discontinuous finite element method with penalty for solving the second order elliptic boundary value problems, and then the stability and convergence analyses are given. In particular, we derive a residual-based reliable a posteriori error estimator and establish the corresponding adaptive algorithms for the discontinuous finite element method.
Plasma cleaning: A new possible treatment for niobium superconducting cavity after nitrogen doping
Ziqin Yang,Xiangyang Lu,Datao Xie,Lin Lin,Kui Zhou,Jifei Zhao,Deyu Yang,Weiwei Tan
Physics , 2015,
Abstract: Nitrogen doping treatment with the subsequent electropolishing (EP) of the niobium superconducting cavity can significantly increase the cavity's quality factor up to a factor of 3. But the process of the EP removal may reintroduce hydrogen in the cavity surface, which may influence the cavity's radio frequency performance. Plasma cleaning study on niobium samples with gas mixtures of argon and oxgen intended to remove contaminations (hydrocarbons and micronicdust particles) from cavity surface to avoid field emission, was performed in Peking University. The niobium samples have been analyzed using the time of flight secondary ion mass spectrometry (TOF-SIMS) to measure the depth profiles of H, C, O, F, P and Nb. The measuring results show that the plasma cleaning with gas mixtures of argon and oxgen and conditions of about 20Pa and 100W can remarkably reduce the contents of impurity elements in the depth of about 30 nm without introducing hydrogen in the cavity surface. So plasma cleaning has been proposed to be a new possible treatment for niobium superconducting cavity after nitrogen doping.
Active inductor shunt peaking in high-speed VCSEL driver design
Futian Liang,Datao Gong,Suen Hou,Chonghan Liu,Tiankuan Liu,Da-Shung Su,Ping-Kun Teng,Annie Xiang,Jingbo Ye,Ge Jin
Physics , 2013, DOI: 10.1088/1674-1137/37/11/116101
Abstract: An all transistor active inductor shunt peaking structure has been used in a prototype of 8-Gbps high-speed VCSEL driver which is designed for the optical link in ATLAS liquid Argon calorimeter upgrade. The VCSEL driver is fabricated in a commercial 0.25-um Silicon-on-Sapphire (SoS) CMOS process for radiation tolerant purpose. The all transistor active inductor shunt peaking is used to overcome the bandwidth limitation from the CMOS process. The peaking structure has the same peaking effect as the passive one, but takes a small area, does not need linear resistors and can overcome the process variation by adjust the peaking strength via an external control. The design has been tapped out, and the prototype has been proofed by the preliminary electrical test results and bit error ratio test results. The driver achieves 8-Gbps data rate as simulated with the peaking. We present the all transistor active inductor shunt peaking structure, simulation and test results in this paper.
CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-A115 COATING IN SEA WATER
LIN Chengfu WEN Lishi QIAN Shengwei Institute of Metal Research,Academia Sinica,Shenyang,ChinaKANG Datao Yanshan University,Qinhuangdao,China LIN Chengfu,
LIN Chengfu WEN Lishi QIAN Shengwei Institute of Metal Research
,Academia Sinica,Shenyang,China KANG Datao Yanshan University,Qinhuangdao,China LIN Chengfu,Institute of Metal Research,Academia Sinica,Shenyang,China

金属学报(英文版) , 1990,
Abstract: The morphology,microstructure,chemical composition and electrochemical behavior of the flame sprayed Zn-Al15 coating after corrosion test in sea water have been investigated.The results show that the selective dissolution of the laminar euteetic structure of the Zn-AI15 coating is the fundamental cause for its similarity in electrochemical behavior with Zn coating and kinetic behavior with Al coating.In the beginning period of sea water corrosion,the com- bined action of the laminar eutectic structure of the coating together with the residual stress may induce the stress corrosion cracking of the coating,and result in the crevice corrosion. The coating then will bulge and.fail in local areas due to embrittlement itself,stacking and ex- pansion of corroded products under the residual stress.
CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-Al15 COATING IN SEA WATER
火焰喷涂Zn—Al15涂层的海水腐蚀失效分析

LIN Chengfu,WEN Lishi,QIAN Shengwei,KANG Datao Institute of Metal Research,Academia Sinica,Shenyang Yanshang University Institute of Metal Research,Academia Sinica,Shenyang,
林成福
,闻立时,钱声伟,康大韬

金属学报 , 1990,
Abstract: The morphology, microstructure,chemical composition and electrochemicalfeature of the flame sprayed Zn-Al15 coating after corrosion test in sea water havebeen investigated. The results show that the selective dissolution of the laminar eu-tectic structure of the Zn-Al15 coating is the fundamental cause for the similarityof the electrochemical static feature to that of the Zn coating and of the kineticfeature to that of Al coating. The combined action of the laminar eutectic structure ofthe coating together with residual stress in the beginning under sea water corrosionmay induce the stress corrosion cracking of the coating, and result the interstitialcorrosion. Then, the coating will bulge and fail in localities due to embrittlementitself, stacking and expansion of corroded products under the residual stress.
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