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Search Results: 1 - 10 of 18690 matches for " ShiZhu Gao "
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Analysis of the matrilineal genetic structure of population in the early Iron Age from Tarim Basin, Xinjiang, China
YinQiu Cui,ShiZhu Gao,ChengZhi Xie,QuanChao Zhang,HaiJing Wang,Hong Zhu,Hui Zhou
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0647-8
Abstract: Ancient mtDNA data of human remains were analyzed from four early Iron Age Tarim Basin sites (Yuansha, Zaghunluq, Sampula and Niya) in the southern Silk Road region. Haplogroup distributions show that ancient Tarim Basin population was comprised of well-differentiated Western and Eastern matrilineal lineages. Some West lineage of Tarim Basin population originated from Near East and Iran region. Of the East lineages, North and Northeast Asia originated lineages were the main components, and a few Southeast Asian lineages also existed, which indicated a more extensive origin and a more complex admixture. The genetic structure of ancient Tarim Basin population is relatively close to the modern populations of Xinjiang, which implied that the early Iron Age is an important period during the formation of the modern Xinjiang population.
Mitochondrial DNA analysis of human remains from the Yuansha site in Xinjiang, China
ShiZhu Gao,YinQiu Cui,YiDai Yang,RanHui Duan,Idelisi Abuduresule,Victor H. Mair,Hong Zhu,Hui Zhou
Science China Life Sciences , 2008, DOI: 10.1007/s11427-008-0034-8
Abstract: The Yuansha site is located in the center of the Taklimakan Desert of Xinjiang, in the southern Silk Road region. MtDNA was extracted from fifteen human remains excavated from the Yuansha site, dating back 2,000–2,500 years. Analysis of the phylogenetic tree and the multidimensional scaling (MDS) reveals that the Yuansha population has relatively close relationships with the modern populations of South Central Asia and Indus Valley, as well as with the ancient population of Chawuhu.
Mitochondrial DNA analysis of human remains from the Yuansha site in Xinjiang, China

GAO ShiZhu,CUI YinQiu,YANG YiDai,DUAN RanHui,Idelisi ABUDURESULE,Victor H MAIR,ZHU Hong &,ZHOU Hui,

中国科学C辑(英文版) , 2008,
Abstract: The Yuansha site is located in the center of the Taklimakan Desert of Xinjiang, in the southern Silk Road region. MtDNA was extracted from fifteen human remains excavated from the Yuansha site, dating back 2,000–2,500 years. Analysis of the phylogenetic tree and the multidimensional scaling (MDS) reveals that the Yuansha population has relatively close relationships with the modern populations of South Central Asia and Indus Valley, as well as with the ancient population of Chawuhu. Supported by the National Natural Science Foundation of China (Grant No. J0530184) and the “985” Foundation of Jilin University
A Method of Feature Selection and Classification Based on Divergence
基于分离度的图象特征提取与识别方法

Lian ShiZhu,
连石柱

中国图象图形学报 , 1996,
Abstract: The separability of two pattern classes can be measured by the divergence for two Gaussian distributions. Because the divergence is invariant under the linear transformation we can extract "good" features for separating two patterns via Karhunen-Loeve transformation. It is shown that the divergence is only dependent on two of n eigenvalues. One property of a "good" dichotomy is that each feature should be effective for classification. Thus, a criterion function is proposed. This algorithm, which is called as sample exchange algorithm, is convergent and it is a reasonable unsupervised clustering method for classification.
Remote collaborative pseudo-dynamic testing system based on acquisition board control

Wang Dapeng,Tian Shizhu,

自然科学进展 , 2007,
Abstract: In this paper, NetSLab network platform for remote collaborative pseudo-dynamic testing, which was developed recently by a research group led by the Hunan University, is presented. Aiming at MTS system which is widely used in structural testing, the control method with acquisition board was investigated in this study to realize the communication interface between NetSLab and MTS system, and open up the remote collaborative pseudo-dynamic testing system. Using the developed testing system, a collaborative pseudo-dynamic testing on LAN was carried out successfully. The result manifests that the data transmission and collaborative control can be implemented accurately between NetSLab and MTS system, so that the usability of the testing system is validated.
Scale dependence of tensile strength of micromachined polysilicon MEMS structures due to microstructural and dimensional constraints
Jianning Ding,Yonggang Meng,Shizhu Wen
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183397
Abstract: The success of microelectromechanical systems (MEMS) as a key technology in the 21st century depends in no small part on the solution of materials issues associated with the design and fabrication of complex MEMS devices. The reliable mechanical properties of these thin films are critical to the safety and functioning of these microdevices and should be accurately determined. In order to accomplish a reliable mechanical design of MEMS, a new microtensile test device using a magnetic-solenoid force actuator was developed to evaluate the mechanical properties of microfabricated polysilicon thin films with dimensions of 100–660 μm length, 20–200 μm width, and 2.4 μm thickness. It was found that the measured average value of Young’s modulus, 164 ±1.2 GPa, falls within the theoretical bounds. The average fracture strength is 1.36 GPa with a standard deviation of 0.14 GPa, and the Weibull modulus is 10.4–11.7, respectively. Statistical analysis of the specimen size effect on the tensile strength predicated the size effect on the length, the surface area and the volume of the specimens due to microstructural and dimensional constraints. The fracture strength increases with the increase of the ratio of surface area to volume. In such cases the size effect can be traced back to the ratio of surface area to volume as the governing parameter. The test data account for the uncertainties in mechanical properties and may be used in the future reliability design of polysilicon MEMS. The testing of 40 specimens to failure results in a recommendation for design that the nominal strain be maintained below 0.0057.
Tribological properties of OTS self-assembled monolayers
Wei Jiang,Jianbin Luo,Shizhu Wen
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03182840
Abstract: Octadecyltrichlorosilane (OTS) self-assembled monolayers (SAMs) were prepared on the substrates of silicon and glass. The tribological properties were tested with a self-made point-contact pure sliding micro tribometer. The effect of humidity on the tribological properties of both OTS SAMs and the naked substrates were studied. When the substrate is covered by OTS monolayer, the friction coefficient is reduced from 0.5 to 0.1 and the stick-slip phenomenon is weakened. OTS monolayer can keep its friction coefficient steady in a wide range of humidity, because it is highly hydrophobic and thus not sensitive to humidity. In addition, the OTS monolayer has a considerable anti-wear ability.
Tribological properties of OTS self-assembled monolayers

Wei Jiang,Jianbin Luo,Shizhu Wen,

科学通报(英文版) , 2001,
Abstract: Octadecyltrichlorosilane (OTS) self-assembled monolayers (SAMs) were prepared on the substrates of silicon and glass. The tribological properties were tested with a self-made point-contact pure sliding micro tribometer. The effect of humidity on the tribological properties of both OTS SAMs and the naked substrates were studied. When the substrate is covered by OTS monolayer, the friction coefficient is reduced from 0.5 to 0.1 and the stick-slip phenomenon is weakened. OTS monolayer can keep its friction coefficient steady in a wide range of humidity, because it is highly hy-drophobic and thus not sensitive to humidity. In addition, the OTS monolayer has a considerable anti-wear ability.
Nano-tribological properties and mechanisms of the liquid crystal as an additive
Mingwu Shen,Jianbin Luo,Shizhu Wen,Junbin Yao
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02900609
Abstract: Under conditions of low speed, small viscosity and molecularly smooth tribo-surfaces, the behavior of lubricant film in the nano scale is different from that in elastohydrodynamic lubrication (EHL) and boundary lubrication (BL). Due to the size effect, long-range ordered structure of liquid crystal (LC) has great effects on the tribological properties and film-forming mechanism of thin film in the nano scale. The technique of relative optical interference intensity (ROII) was used to investigate nano-tribological properties when cholesteryl LCs are added to hexadecane. The results indicate that the practical film thickness of hexadecane with liquid crystal is 3–5 times as large as that expected from EHL theory in the low speed region. The film thickness increases with the enhancement in polarity and concentration of LC in hexadecane, and external DC voltage. The effective viscosity of lubricant is related to the film thickness and the voltage and it varies from bulk viscosity to several times or tens of times of bulk viscosity with reducing film thickness, and slowly rises with increasing external DC voltage and then trends to a constant. The higher ordered degree of molecules close to solid surfaces gives rise to a thicker film.
Friction characteristics of floppy disks
Chenhui Zhang,Jianbin Lou,Darong Chen,Shizhu Wen
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02884897
Abstract: This note presents the principle and structure of a tribological measure for floppy disks. The precision of the force measuring system is 1 mN in loading and 3×10 6 N in friction. The resolution of the film thickness between head and floppy disk is 0.5 nm in the vertical and 1.5 nm in the horizontal direction. In order to investigate the tribological characteristics of floppy disks, six types of floppy disks have been tested and the floating properties of these disks are also studied with film measuring system. The experimental results of the surface morphology and friction coefficient of these floppy disks using the atomic force microscope/friction force mcroscope (AFM/FFM) are in accordance with the conclusion made by our own measuring system. The experimental results show that the air film thickness between head and disk is of the same order as the surface roughness of floppy disks.
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