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Search Results: 1 - 10 of 151552 matches for " LI Zheng-Hai "
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A Splitting Augmented Lagrangian Method for Low Multilinear-Rank Tensor Recovery
Lei Yang,Zheng-Hai Huang,Yufan Li
Mathematics , 2013,
Abstract: This paper studies a recovery task of finding a low multilinear-rank tensor that fulfills some linear constraints in the general settings, which has many applications in computer vision and graphics. This problem is named as the low multilinear-rank tensor recovery problem. The variable splitting technique and convex relaxation technique are used to transform this problem into a tractable constrained optimization problem. Considering the favorable structure of the problem, we develop a splitting augmented Lagrangian method to solve the resulting problem. The proposed algorithm is easily implemented and its convergence can be proved under some conditions. Some preliminary numerical results on randomly generated and real completion problems show that the proposed algorithm is very effective and robust for tackling the low multilinear-rank tensor completion problem.
Global Uniqueness and Solvability for Tensor Complementarity Problems
Xue-Li Bai,Zheng-Hai Huang,Yong Wang
Mathematics , 2015,
Abstract: Recently, the tensor complementarity problem (TCP for short) has been investigated in the literature. An important question involving the property of global uniqueness and solvability (GUS-property) for a class of TCPs was proposed by Song and Qi in their paper "Properties of Some Classes of Structured Tensors". In the present paper, we give an answer to this question by constructing two counter-examples. We also show that the solution set of this class of TCPs is nonempty and compact. In particular, we introduce a class of related structured tensors, and show that the corresponding TCP has the GUS-property.
Exceptionally Regular Tensors and Tensor Complementarity Problems
Yong Wang,Zheng-Hai Huang,Xue-Li Bai
Mathematics , 2015,
Abstract: Recently, many structured tensors are defined and their properties are discussed in the literature. In this paper, we introduce a new class of structured tensors, called exceptionally regular tensor, which is relevant to the tensor complementarity problem. We show that this class of tensors is a wide class of tensors which includes many important structured tensors as its special cases. By constructing two examples, we demonstrate that an exceptionally regular tensor can be, but not always, an $R$-tensor. We also show that within the class of the semi-positive tensors, the class of exceptionally regular tensors coincides with the class of $R$-tensors. In addition, we consider the tensor complementarity problem with an exceptionally regular tensor or an $R$-tensor or a $P_0+R_0$-tensor, and show that the solution sets of these classes of tensor complementarity problems are nonempty and compact.
Classification of plant functional groups based on the energy attributes: a casestudy on the steppe community in Xilin River basin, Inner Mongolia
基于能量属性的植物功能群划分方法探索——以内蒙古锡林河流域草原植物群落为例

BAO Ya-Jing,LI Zheng-Hai,
鲍雅静
,李政海

生态学报 , 2008,
Abstract: Plant functional groups(PFGs) is assemblage of plants which have certain functional characteristics, and is an ecological concept introduced by ecologist in order to study the response of vegetation to climate changes and disturbances. At present the key problem about PFGs still is the plant feature selection applying to classication of PFGs. Taking steppe community in Xilin river Basin of Inner Mongolia as the case study area, 12 sampling plots including 3 steppe community types (Leymus chinensis stppe, Stipa grandis steppe, Leymus chinensis meadow steppe) each with 4 degradation intensities (including undegraed, light degraded, morderated degraded, heavy degraded ) were selected, based on the determination of the caloric values for plant species, a new functional classification method named by Energy Plant Functional Groups (ab. Energy PFGs) was set, which grouped the species into 3 groups including high-energy PFGs, moderate-energy PFGs and low-energy PFGs according to the mean caloric value of species by man-made subsection then the objectivity and feasibility of the the Energy PFGs classification methods were discussed.
CHANGING LANDSCAPE DIVERSITY WITH TIME IN XILINGUOLE STEPPE
锡林郭勒草原景观多样性的时间变化

Wuyunna,LI Zheng-Hai,
乌云娜
,李政海

植物生态学报 , 2000,
Abstract: 利用锡林郭勒草原典型区段的两个不同年代的遥感信息源,结合实地考察目视解释研究区1978年(MSS)、1992年(TM)的卫片影像,得到研究两张不同时期的植被图,以植物群落做为确定景观单元的最主要因子,在ARC/INFO软件的支持下,通过景观元素空间格局的变化,进一步分析得出在14a的时间进程中,研究区景观破碎花现象加剧,多样性指数增加,优势度指数下降,人类不合理的放牧利用、农田开展等经营活动,引起
5-Carboxy-2-isopropyl-1H-imidazol-3-ium-4-carboxylate monohydrate
Chao-Jun Du,Zheng-Hai Shi,Li-Sheng Wang,Chao-Ling Du
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811024767
Abstract: In the title compound, C8H10N2O4·H2O, the imidazole N atom is protonated and one of the carboxylate groups is deprotoned, forming a zwitterion. An intramolecular O—H...O hydrogen bond occurs. The crystal structure is stabilized by intermolecular N—H...O and O—H...O hydrogen bonds. In addition, intermolecular N—H...O and O—H...O hydrogen bonds link the molecules into two-dimensional networks parallel to (10overline{2}).
The Morphology of the Dichotomous Leaf Venation of Circaeaster agrestis and Its Systematic Implication
星叶草叶脉序的形态学及其系统学意义

Ren Yi,Hu Zheng-hai,Li Zhi-jun,
任毅
,胡正海,李智军

中国科学院研究生院学报 , 1997,
Abstract: Observations on the dichotomous leaf venation of Circaeaster agrestis found no intermediate forms of the fusion of vascular bundles between the two completely fused commissural veins of anastomoses and the two separate approximate veins, but found different degrees of the vestige of commissural veins . The fact indicates the impossibility of the formation of anastomoses from approximate veins. The occurrence of blind veins is related to the degeneration of teeth, the interruption of the commissural veins and the interruption of nonanastomosous veins at the branching point. Therefore, we considered the dichotomous leaf venation of this species as a reduced characteristic.
Kingdonia, Embryology and Its Systematic Significance
独叶草属的胚胎学及其系统学意义

REN Yi,WANG Ma-Li,HU Zheng-Hai,
任毅
,王玛丽,胡正海

中国科学院研究生院学报 , 1998,
Abstract: The embryological studies show that Kingdonia is similar to Circaeaster while different from other members of the Ranunculales (sensu Takhtajan, 1980) in development of endosperm and embryo. We consider that there is close systematic relationship between Kingdonia and Circaeaster.
XEROMORPHIC CHARACTERS IN THE VEGETATIVE ORGANS OF PEGANUM HARMALA
骆驼蓬营养器官的旱生结构

Zhang Hong Chen Li-chun Hu Zheng-hai,
张泓
,陈丽春,胡正海

植物生态学报 , 1992,
Abstract: Peganum harmala, a xerophyte, growing in extremely dry habitats or in salt marshes possessed distinct xeromorphic characters. The thickened tap root appeared to consist of 2 or 3 rings of anomalous vascular bundles surrounding the central cylinder which might be an important adaption to dry condition. The succulent stem was characterized by a well-developed water-storing tissue in the cortex, phloem, especially in the pith. Leaves were also succulent without trichomes. The outer walls of the epidermal cells were covered by thick cuticle whose surface was ridged. The guard cells of the stomata were at almost the same plane level with other epider- mal cells. The stomatal size was larger and its frequency was lower than those of other xerophytes. Two types of tissues could be distinguished in mesophyll: palisade tissue and water storage tissue. The veins in the leaves were not so developed. Ratio of the external leaf surface to its volume was smaller than mesophytes. According to the structural features mentioned above it can be concluded that Peganum harmala is a typical succulent xerophyte.
Effects of Mowing Frequency on the Energy Standing Crops of Major Populations in a Leymus chinensis Steppe of Inner Mongolia
不同频次刈割对羊草草原主要植物种群能量现存量的影响

BAO Ya-Jing LI Zheng-Hai ZHONG Yan-Kai YANG Chi,
鲍雅静
,李政海,仲延凯,杨持

植物学报 , 2005,
Abstract: Through field experiments involving different mowing frequencies for 17 years, we studied variation of the energy standing crops of major populations in a Leymus chinensis steppe of Inner Mongolia. The populations were divided into 3 mowing response groups according to response to mowing frequency: species restrained by mowing, species that benefited from mowing, and species whose distribution remained steady under mowing. The restrained species include L. chinensis, Achnatherum sibiricum, Carex korsinskyi, Allium spp. and other forbs,which decreased in distribution with increasing mowing frequency. The species that benefited include Koeleria cristata and Cleistogenes squarrosa, which increased in distribution with increasing mowing frequency. The tolerant species include Stipa grandis and Agropyron michnoi, which did not change in distribution under mowing disturbance. As far as the relative energy standing crops, all but L. chinensis gradually declined in distribution with increasing mowing frequency; other restrained species did not change in distribution, while the species that benefited and those whose distribution was steady increased with increasing mowing frequency. Successive mowing also influenced the caloric values of some species but the variation was less than 10%.
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