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Search Results: 1 - 10 of 40845 matches for " SHEN Hai-xiang "
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Community Characteristics of Soil Sarcomastigophora in the Mayan Forest Region of the National Nature Reserve of Xiaolong Mountains
小陇山国家自然保护区麻沿林区土壤肉鞭虫群落特征

ZOU Tao,SHEN Hai-xiang,MA Zheng-xue,NING Ying-zhi,
邹涛
,申海香,马正学,宁应之

动物学研究 , 2009,
Abstract: The community characteristics of soil Sarcomastigophora in the Mayan Forest Region of the National Nature Reserve of Xiaolong Mountains was studied using the non-flooded petri dish method and observation in vivofrom July of 2006 to April of 2007. In total 78 species were identified, including 2 unnamed species and 12 new records of soil Sarcomastigophora in China, belonging to two subphylums,five classes, 16 orders, 32 families, and 47 genera.Amoebida was the dominant group, Kinetoplastida and Euglenida wer...
The Attractors of the discretized Burgers-Ginzburg-Landau Equations
离散的Burgers-Ginzburg-Landau方程组的吸引子

HUANG Hai-Xiang,
黄海洋

数学物理学报(A辑) , 2002,
Abstract: In this paper, the Burgers Ginzburg Landau equations with periodic boundary condition are discretized by the finite difference method in spatial direction. It is proved that for each mesh size, there exists an attractor of the discretized system. The bounds for the Hausdorff and fractal dimensions of the attractors are obtained for sufficiently small mesh size. The bounds are independent of the mesh iszes, so that the discretized finite dimensional systems can be used to analyze, numerically and approximately, the infinite dimensional dynamical system of the Burgers Ginzburg Landau equations.
Community characteristics of soil sarcodinid and flagellate in Taohuagou forest park in Xia-olongshan Mountains of Gansu
甘肃小陇山桃花沟森林公园土壤肉鞭虫群落特征

SHEN Hai-xiang,MA Zheng-xue,MA Shang-sheng,NING Ying-zhi,WANG Juan,
申海香
,马正学,马尚盛,宁应之,王娟

生态学杂志 , 2009,
Abstract: 2004年8月—2007年7月,用非淹没培养皿法和活体观察法对桃花沟森林公园及符家滩土壤肉鞭虫的群落特征进行了研究。共鉴定出肉鞭虫75种,在桃花沟森林公园的土壤中鉴定出肉鞭虫69种,隶属于4纲10目22科33属,其中桃花沟景区的土壤肉鞭虫58种,普渡峡景区33种;而受人为干扰较为严重的符家滩的土样中鉴定出22种。在桃花沟森林公园土壤肉鞭虫群落中,金滴目、动基体目和变形目为其优势类群;星状棘变虫、噬棘变虫、气球屋滴虫、球形波豆虫、卵形波豆虫和变形泡虫为其优势种。符家滩土壤肉鞭虫群落中,眼虫目、金滴目和动基体目为其优势类群;卵形波豆虫为其优势种。桃花沟景区、普渡峡景区和符家滩土壤肉鞭虫的Gleason-Margalef物种多样性指数分别为6.60、4.00和3.20;桃花沟景区与普渡峡景区土壤肉鞭虫的Jaccard群落相似性系数为0.32,桃花沟景区、普渡峡景区与符家滩土壤肉鞭虫的群落相似性系数分别为0.18和0.20。结果表明,桃花沟森林公园土壤肉鞭虫物种丰富,特有和稀有物种繁多,群落结构复杂,群落组成具有鲜明的独特性,同时也表明自然环境与受人为干扰的环境中土壤肉鞭虫物种多样性和群落结构有显著差异。
Species diversity of aquatic Sarcomastigophoran (Protista, Sacromastigophora) in scenic spots and historic sites of Maiji Mountain
麦积山肉鞭毛虫的物种多样性

MA Zheng-Xue,SHEN Hai-Xiang,KANG Rui-Qin,NING Ying-Zhi,RAN Li-Yuan,
马正学
,申海香,康瑞琴,宁应之,冉丽媛

水生生物学报 , 2009,
Abstract: 用活体观察法对迄今缺乏了解的麦积山肉鞭类原生动物的物种多样性进行了调查,共鉴定出水生肉鞭虫100种,包括2个未知种。鞭毛亚门(Mastigophora)有2纲9目15科31属59种。植鞭纲(Phytomastigophorea)有52种,其中眼虫目(Euglenida) 36种,占鞭毛虫物种总数的61.02%,为优势类群;动鞭纲(Zoomastigophorea)仅有7种,没有明显的优势类群。肉足亚门(Sarcodina)有4纲6目19科32属41种。叶足纲(Lobosea)有31种,其中变形目(Amoebida)16种,占肉足虫物种总数的39.02%,为优势类群;表壳目(Arcellinida)12种,占29.27%,为次优势类群。在麦积山风景名胜区的南坡(为嘉陵江水系)分布有71种,北坡(为渭河水系)分布有56种,分水岭分布有13种,水生肉鞭毛虫的群落组成也显著不同;与国内典型的长江水系、雅鲁藏布江水系和黄河水系相比,麦积山分布的水生肉鞭毛虫群落组成均存在显著性差异。结果表明,麦积山水生肉鞭毛虫物种十分丰富,特有和稀有物种繁多,具有鲜明的独特性。
SVM classification of SAR images based on texture and internal edge
.基于纹理和边缘的SAR图像SVM分类*

LONG Hai-xiang,GAO Xin,
龙海翔
,高鑫

计算机应用研究 , 2011,
Abstract: For efficient land cover classification in SAR images,this paper studied 4 textural features based on GLCM and 2 edge features.First,it analyzed every individual feature for their discriminative ability for SVM SAR image classification into various land cover types.And then,chose several feature sets for SVM SAR image classification,and fused these features using PCA.The difference between PCA-and non-PCA-based classifications was also analyzed.The result shows the feature set comprising energy,edge length,...
Diethyl(hydroxy)ammonium 3-carboxybenzoate
Yun Guo,Cong Wang,Hai-Xiang Chen
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810030746
Abstract: In the title molecular compound, C4H12NO+·C8H5O4 , the N,N-diethyl(hydroxy)ammonium cation (DTHA) is linked to the 3-carboxybenzoate anion (HBDL) by O—H...O and N—H...O hydrogen bonds with a graph-set motif R22(7). In the crystal, helical chains are formed by O—H...O hydrogen bonds, propagating along [010]. The crystal structure is further stabilized by π–π interactions between inversion-related HBDL benzene rings [centroid–centroid distance = 3.900 (4) ] and C—H...O interactions.
Bis[diethyl(hydroxy)ammonium] benzene-1,4-dicarboxylate
De-Ming Xie,Chun-Xiao Chen,Hai-Xiang Chen,Hai-Bin Wang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810027868
Abstract: In the centrosymmetric title compound, 2C4H12NO+·C8H4O42 , two N,N-diethyl(hydroxy)ammonium cations are linked to a benzene-1,4-dicarboxylate dianion by a combination of O—H...O and N—H...O hydrogen bonds, which can be described in graph-set terminology as R22(7). The crystal structure is further stabilized by C—H...O hydrogen bonds, leading to the fomation of a ribbon-like network.
Portfolio selection with different borrowing-lending rates:Utility maximization model based on mean and VaR
不同借贷利率下的投资组合选择——-基于均值和VaR的效用最大化模型

YAO Hai-xiang,LI Zhong-fei,
姚海祥
,李仲飞

系统工程理论与实践 , 2009,
Abstract: 用VaR代替方差来度量风险,从而把基于均值和方差的效用函数拓展为基于均值和VaR的一般二元效用函数(关于均值递增,关于VaR递减),进而研究含无风险资产且具有不同借贷利率时投资组合选择的效用最大化模型.利用均值-VaR模型有效边界的性质,得到了一般效用函数下最大效用存在的条件及最优解的本质特征,并给出了求解的具体方法和数值算法.最后作为结论的直接应用和说明,利用中国股票市场数据给出了一个实例分析.
Changes of Myosin ATPase Activities and Their Visceral Indices in Spermophilus dauricus Muscle During Postnatal Development
幼龄、亚成年、成年达乌尔黄鼠比目鱼肌Ⅰ和Ⅱ型肌纤维的比例与脏器指数的比较

DANG Kai,WANG Qi,ZHANG Hai-xiang,GAO Yun-fang,
党凯

动物学研究 , 2006,
Abstract: 选取达乌尔黄鼠(Spermophilusdauricus)24只,按年龄分为幼龄、亚成年和成年3组。采用Ca2 -ATPase法测定比目鱼肌的mATPase活性,计算Ⅰ型和Ⅱ型肌纤维的比例,并称量达乌尔黄鼠脏器重量,计算脏器指数。结果显示(1)成年组和亚成年组达乌尔黄鼠比目鱼肌中Ⅱ型肌纤维比例均极显著地低于幼龄组;成年组Ⅱ型肌纤维比例也有明显低于亚成年组的趋势;(2)幼龄组达乌尔黄鼠的胸腺指数显著高于亚成年组和成年组,脾脏指数显著高于亚成年组;肝脏指数则均极其显著低于亚成年组和成年组;成年组与亚成年组相比,肝脏指数显著增高,其他指数无显著性差异。以上结果提示,在生长发育过程中,达乌尔黄鼠比目鱼肌的mATPase活性逐渐降低,因而其Ⅱ型肌纤维的比例逐渐减小;胸腺指数、脾脏指数均逐渐降低,肝脏指数则逐渐升高。
Embedded Zerotree Wavelet Image Coding Algorithm Based on Single List and Recursive Scan
基于单队列递归扫描的嵌入式零树图象编码方法

ZHANG Hai-xiang,CHEN Chun,ZHUANG Yue-ting,
张海翔
,陈纯

中国图象图形学报 , 2002,
Abstract: An improved embedded zerotree wavelet image coding algorithm is proposed in this paper. It is an improved vision of Shaprio's EZW algorithm. First, a single list scheme is used in successive-approximation Quantization(SAQ), dispensing with double dynamic list of EZW algorithm. The single list make the scan process more simple and faster, and lead to better rate-distortion characteristic. Second, a fast algorithm based on spatial orientation tree recursive scan for the zerotree coding is designed. The zerotree symbols of one quantization layer can be calculated with only one access per coefficient, solving the rescaning problem completely. At last, a new Markov model based on quantization symbol field relativity for adaptive arithmetic coding algorithm is used, for higher compression efficient. Experimental results show that it peroforms better than the EZW algorithm in coding efficiency, maintains the fine-granularity scalability.
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