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Search Results: 1 - 10 of 181291 matches for " ZHAO Li-Juan "
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On Diagnostic Index and Method of Healthy Wetland Food Chain
Li-Juan Cui,Xin-sheng Zhao,Wei Li
Advance Journal of Food Science and Technology , 2013,
Abstract: Wetland food chain is the channel of the matter and energy transfer or flow in the wetland ecosystem. From wetland food chain scission mechanism, the structure and functional characteristics of the wetland food chain scission were analyzed, while building a healthy wetland food chain diagnostic index system. Depending on wetland ecosystem health research results, this study brought forward the wetland food chain structure stability and functions of wetland energy measures and their quantitative calculation formula and finally we gave the healthy wetland food chain diagnosis process in order to provide scientific basis for wetland food chain restoration.
Influence of environment temperature wide-range variation on Brillouin shift in optical fiber
环境温度宽范围变化对光纤布里渊频移的影响

Zhao Li-Juan,
赵丽娟

物理学报 , 2010,
Abstract: 搭建了光纤布里渊频移测量系统,实现了色散位移光纤20 ℃到820 ℃布里渊频移的测量,并对测量数据进行拟合. 在环境温度大范围变化时,目前采用的布里渊频移-温度一阶线性关系式对测量数据分析误差较大,针对这个问题,本文从纯石英光纤的结构特点和材料的物性系数出发,在分析光纤的热膨胀系数、光纤密度、折射率、弹性模量和泊松比与宽范围温度关系的基础上,根据布里渊频移与各物性参数的关系式理论推导了宽范围温度变化与布里渊频移之间的二次项关系式. 理论推导结果与实验数据基本符合,验证了理论分析的正确性,从而为光纤宽范围布
Novel high-voltage power device based on self-adaptive interface charge

Wu Li-Juan,Hu Sheng-Dong,Zhang Bo,Li Zhao-Ji,

中国物理 B , 2011,
Abstract:
Non-uniform subdivision for B-splines of arbitrary degree
具有任意自由度的B样条非均匀细分*

SUN Li-juan,LIU Yang,ZHAO Qiang,
孙立镌
,刘扬,赵强

计算机应用研究 , 2011,
Abstract: This paper proposes a cross-layer packet scheduling scheme based on the HSDPA system for supporting diverse QoS requirements of mixed services. During the process, mixed services are classified according to service types, QoS levels and user status. We introduce service QoS and channel status parameters into computation to estimate probability, try to achieve a balance between mixed services quality and system performance. Simulation results indicate that our scheme has superior performance in the domain of transmission delay, data throughput.
Cubic spline interpolation for solving navigation stochastic differential model
导航随机微分模型的三次样条插值求解探索

ZHAO Yu-xin,CHEN Li-juan,
赵玉新
,陈立娟

控制理论与应用 , 2011,
Abstract: We propose applying cubic spline function to approximate the probability density function of the state of a navigation system.The weak solution of navigation stochastic differential model is described by the Kolmogorov's forward equation which is difficult to be solved.This article approaches its solution through cubic spline interpolation functions to obtain a prior probability density function of the state,and then a posterior probability density function is gained through the Bayes formula.Thus,the most ...
Study on recognizing features from freeform surface
自由曲面特征识别的研究

SUN Li-juan,ZHENG Hong,ZHAO Qiang,
孙立镌
,郑虹,赵强

计算机应用研究 , 2009,
Abstract: 由于利用基于区域分割的方法识别曲面往往会造成曲面模型的过度分割,而利用单纯的基于边缘检测的方法识别曲面有时又不能提供较好的区域结构,基于此给出一种自动识别STL(standard triangulation language)形式的CAD模型自由曲面特征的方法——基于边和区域的混合分割方法。通过检测STL三角网格模型的特征边对模型进行有效的区域分割,再计算这些区域上各点的Gauss(K)和平均曲率(H)来确定区域类型,最终达到识别的目的。经验证,该方法能够发挥上述两种方法的优势,获得更好的分割效果,从而
2-Isopropyl-5-methylcyclohexyl cyclohexyl(phenyl)phosphinate
Hao Xu,Li-Juan Liu,Fan-Jie Meng,Chang-Qiu Zhao
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811010592
Abstract: In the title molecule, C22H35O2P, the two cyclohexyl rings exhibit chair conformations. In the crystal, molecules related by translation along the b axis are linked by the weak intermolecular C—H...O hydrogen bonds.
2-(2-Chloro-3-quinolyl)-3-phenylthiazolidin-4-one
Wei-Wei Liu,Ji-You Sun,Li-Juan Tang,Yue-Qiang Zhao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809041543
Abstract: In the title compound, C18H13ClN2OS, the thiazolidinone ring is slightly distorted and adopts a envelope conformation. The basal plane is nearly perpendicular to the quinoline ring, forming a dihedral angle of 86.1 (1)°, and makes a dihedral angle of 14.9 (1)° to the benzene ring. The benzene ring is also nearly perpendicular to the quinoline ring, forming a dihedral angle of 89.4 (1)°. In the crystal, non-classical C—H...O and C—H...N hydrogen bonds link the molecules, forming polymers along b.
catena-Poly[[tetrakis(μ-pentafluorobenzoato-κ2O:O′)dimolybdenum(II)]-μ-4,4′-bipyridine-κ2N:N′]
Li-Juan Han
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811031734
Abstract: In the title compound, [Mo2(C7F5O2)4(C10H8N2)]n, the molecule forms a paddle-wheel-type structure. Each Mo24+ unit is equatorially coordinated by four pentafluorobenzoate groups, while the axial positions are occupied by two 4,4′-bipyridine molecules. The Mo—Mo bond length of 2.1227 (4) is representative of a dimolybdenum quadruple bond. An infinite linear chain parallel to [110] is formed by the Mo24+ unit coordinating axially to the two N atoms of the 4,4′-bipyridine ligand [Mo—N = 2.594 (2) ]. The crystal packing shows molecules linked together into a three-dimensional network via Mo—N coordination interactions and weak π–π stacking interactions between perfluorophenyl rings [centroid–centroid distance = 3.7280 (3) and centroid-to-plane distance = 3.6103 (12) between two pentafluorophenyl rings].
5-Butylamino-2-[2-(dimethylamino)ethyl]-1H-benz[de]isoquinoline-1,3(2H)-dione
Li-Juan Xie
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810018702
Abstract: The title compound, C20H25N3O2, is a new amonafide analogue, which exhibits antitumor activity. The asymmetric unit contains two molecules with similar conformations for the substituted aliphatic chains. The two independent molecules form dmers through N—H...N hydrogen bonds. The crystal structure is stabilized via π–π stacking interactions, the shortest centroid–centroid separation between six-membered rings being 3.673 (2) .
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