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Search Results: 1 - 10 of 78296 matches for " Siming Chen "
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The Research on Neutral Grounding Scheme of Fengxian 35kV and 10 kV Power Grid  [PDF]
Siming Hua, Hua Zhang, Feng Qian, Chunjie Chen, Meixia Zhang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B172

Combined with actual situation of Fengxian power Supply Company, the neutral grounding modes of Fengxian 35 kV and 10 kV power grid are studied in the paper. The different frequencies injected method is used to measure the capacitive current of Fengxian 28 substations, and the neutral grounding modes of the 28 substations are determined based on the measured values of capacitive current.

Magnetization ground states and phase diagrams for a nano-sized Co hollow sphere : an onion-type magnetization state
Desheng Kong,Siming Wang,Chinping Chen
Physics , 2008, DOI: 10.1063/1.2952029
Abstract: The magnetization ground states (MGSs) for a nanosized Co hollow sphere, with the outer radius, R < 50 nm, have been studied numerically by micromagnetic simulation using object oriented micromagnetic framework (OOMMF). In addition to the originally known single domain and vortex-curling states, a three dimensional "onion" state with a corresponding analytical expression is proposed and confirmed as one of the ground states. Two phase diagrams, one for a single crystalline and the other for a polycrystalline nanosphere, are obtained for the three MGSs. The result reveals that the magnetic anisotropy has a significant effect on the phase line in the diagrams. The finite temperature effect and the blocking properties of the nanosphere for the magnetization reversal are discussed.
Derivation of the Electron Distribution in SNR RX J1713.7-3946 via a Spectral Inversion Method
Hui Li,Siming Liu,Yang Chen
Physics , 2011, DOI: 10.1088/2041-8205/742/1/L10
Abstract: We show that the radio, X-ray and gamma-ray spectrum of the supernova remnant RX J1713.7-3946 can be accounted for with the simplest emission model, where all of these emissions are attributed to a population of relativistic electrons interacting with the cosmic microwave background radiation, IR interstellar photons, and a background magnetic field. With a spectral inversion method (Johns & Lin 1992), the parent electron distribution and its uncertainties are derived from the observed photon spectrum. These results are independent on the model of particle acceleration and strongly support the leptonic scenario for the TeV emission.

Tao Siming,Chen Zongmao,

环境科学学报 , 1994,
Abstract: 根据光化学基本理论,推导出描述均匀薄层固相农药光解速度的数学模型。依此模型,提出了固相农药在313nm波长处的光化学反应量子产率的测定方法。利用人工紫外光和自然光对5种农药在惰性玻璃表面和茶树叶表面的光解速率进行了研究,建立了茶树叶表上农药在自然日光下的光解速度和半衰期预测数学模型。实测表明,模型预测值与实测值吻合。
RF Magnetron Sputtering Aluminum Oxide Film for Surface Passivation on Crystalline Silicon Wafers
Siming Chen,Luping Tao,Libin Zeng,Ruijiang Hong
International Journal of Photoenergy , 2013, DOI: 10.1155/2013/792357
Distance comparison principle and Grayson type theorem in the three dimensional curve shortening flow
Siming He
Mathematics , 2012,
Abstract: In this paper, we use the distance comparison principle, first been developed by G. Huisken, to study the spatial curve shortening flow. We have got the result that if the initial curve is the helix, then the local minimum of the ratio of the extrinsic and intrinsic distance is non-decreasing. And we have proved a Grayson type theorem for a variety of spatial curves.
Development of a Hybrid Atomic Force Microscopic Measurement System Combined with White Light Scanning Interferometry
Tong Guo,Siming Wang,Dante J. Dorantes-Gonzalez,Jinping Chen,Xing Fu,Xiaotang Hu
Sensors , 2012, DOI: 10.3390/s120100175
Abstract: A hybrid atomic force microscopic (AFM) measurement system combined with white light scanning interferometry for micro/nanometer dimensional measurement is developed. The system is based on a high precision large-range positioning platform with nanometer accuracy on which a white light scanning interferometric module and an AFM head are built. A compact AFM head is developed using a self-sensing tuning fork probe. The head need no external optical sensors to detect the deflection of the cantilever, which saves room on the head, and it can be directly fixed under an optical microscopic interferometric system. To enhance the system’s dynamic response, the frequency modulation (FM) mode is adopted for the AFM head. The measuring data can be traceable through three laser interferometers in the system. The lateral scanning range can reach 25 mm × 25 mm by using a large-range positioning platform. A hybrid method combining AFM and white light scanning interferometry is proposed to improve the AFM measurement efficiency. In this method, the sample is measured firstly by white light scanning interferometry to get an overall coarse morphology, and then, further measured with higher resolution by AFM. Several measuring experiments on standard samples demonstrate the system’s good measurement performance and feasibility of the hybrid measurement method.

Chen Kaoshan,Liu Siming,Zhou Xie,

生物物理学报 , 1995,
Abstract: The effed of ABA on membrane micro-viscosity and membrane surface electrostatic potential of mitochondria isolated from etiolated buds of maize buds of maize or from cotyledons of soybean and were investigated by fluoresnce polarhation and neural red method respctively. Results showed that ABA decreased membrane micro-viscosity and increasedmembrane surface electrostatic potential, Which resulted in the increase of O2 uptake of ndtochondria. The effect of ABA on membrane micro-viscosity exhibited saturation Kinetics; and that on surface potential of mitochodria was quite different in various plants, larger in maize than in soybean. Increased A350 of soybean mitochodria means that mitochodrial aggregation could be induced.
Molecular phylogenetic systematics of twelve species of Acipenseriformes based on mtDNAND4L—ND4 gene sequence analysis
Siming Zhang,Yaping Zhang,Xiangzhong Zheng,Yongjiu Chen,Huai Deng,Dengqiang Wang,Qiwei Wei,Yunwu Zhang,Long Nie,Qingjiang Wu
Science China Life Sciences , 2000, DOI: 10.1007/BF02879121
Abstract: Acipenseriformes is an endangered primitive fish group, which occupies a special place in the history of ideas concerning fish evolution, even in vertebrate evolution. However, the classification and evolution of the fishes have been debated. The mitochondrial DNA (mtDNA)ND4L and partialND4 genes were first sequenced in twelve species of the order Acipenseriformes, including endemic Chinese species. The following points were drawn from DNA sequences analysis: (i) the two species ofHuso can be ascribed toAcipenser, (ii)A. dabryanus is the mostly closely related toA. sinensis, and most likely the landlocked form ofA. sinensis; (iii) genusAcipenser in trans-Pacific region might have a common origin; (iv) mtDNAND4L andND4 genes are the ideal genetic markers for phylogenetic analysis of the order Acipenseriformes.
Conditions for origin to be a center and the bifurcation of limit cycles in a class of cubic systems
Jiehua Zhu,Siming Zhu
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882836
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