oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 7 )

2018 ( 12 )

2017 ( 6 )

2016 ( 501 )

自定义范围…

匹配条件: “<br>张梅” ,找到相关结果约439918条。
列表显示的所有文章,均可免费获取
第1页/共439918条
每页显示
The Progress of examination in elasticity of artery and blood flow field by ultrasound
超声技术对动脉血管弹性和血液流场检测的研究进展

ZHANG Mei,<br>
中华医学超声杂志(电子版) , 2009,
Abstract: 动脉粥样硬化是心血管疾病的主要病理基础之一,易损斑块破裂导致血栓形成和急性血管闭塞是心血管病事件的主要病理机制.早期诊断动脉粥样硬化、识别易损斑块和稳定斑块对于防治心血管疾病具有重要的临床意义.研究表明,在动脉粥样硬化病变的早期血管功能就可出现异常,斑块破裂与否取决于斑块内在生物特性和外在力学特征,斑块在外力的作用下可发生形变,不同类型斑块发生形变与斑块的稳定性有关,在同样的外力作用下纤维帽薄的脂质斑块及斑块肩部易发生形变而破裂1,2].
REQUIREMENT TO WATER ON DIFFERENT CROPS UNDER DIFFERENT DRYLAND CONDITIONS
不同作物在不同土壤水分条件下的耗水特性

Zhang Ximei,<br>
生态学报 , 1989,
Abstract: 本文系用盆裁法,对在干旱半干旱地区种植的八种主要作物——玉米、高粱、谷子、糜子、春麦、扁豆、胡麻、苜蓿等在适宜水分,轻度干旱、中度干旱、严重干旱、极严重干旱等五种土壤水分条件下的耗水特性进行了系统研究,比较了它们在耗水特性上的差异,并寻找了这种差异与需水日变化的关系,为其在干旱半干旱地区的合理布局与结构及其提高水分利用效率、旱作栽培提供了科学依据。
A PRELIMINARY REPORT OF SOIL DEMATIACEOUS HYPHOMYCETES FROM THE YELLOW RIVER DELTA I.
黄河三角洲地区土壤中暗色丝孢菌研究初报Ⅰ

Abstract,<br>刘会,天宇
菌物学报 , 2004,
Abstract: 采用土壤平板法和稀释法从山东黄河三角洲地区土壤中分离出40个暗色丝孢菌分离物,鉴定为13属23种。其中光滑端梗霉Acrophialophora levis、大棘黑团孢Periconia macrospinosa、大孢瓶梗霉Phialomyces macrosporus、粗糙短梗蠕孢Trichocladium asperum、螺旋毛束霉Trichurus spiralis和树头毛束霉Trichurus dendrocephalus等6种真菌为中国新记录种。所报道真菌种的干制培养物保存在山东农业大学植物病理学标本室(HSAUP)。
Detection of Moving Small Targets By FPGA
基于FPGA设计的运动弱小目标检测

ZHANG Caimei ZHANG Qiheng,<br>,启衡
红外 , 2004,
Abstract: Grievous specie noise was taken out by a maximum/median filter and the image sequences at low Signal to Noise Ratio (SNR) were cumulated using the relativity of target. The SNR. could be improved. A signal processor which can implement the algorithm by FPGA is presented. The experimental results indicate that the method can effectively improve the SNR of image sequences and the platform can implement the method in real time.
Temporal and spatial changes of plant community diversity on the Ordos Plateau
鄂尔多斯高原植物群落多样性时空变化特点

Yongmei Huang,Mingli Zhang,<br>黄永,明理
生物多样性 , 2006,
Abstract: In order to provide a scientific basis for biodiversity protection on the Ordos Plateau, we compared plant community diversity in 1999 and 2000 with that in 1986 (Li, 1990). The results indicated that the 23 major types of plant communities showed significant differences in Simpson index, Shannon-Wiener index, and coverage, but similar richness. Higher diversity and higher coverage occurred in the typical steppe in the middle-eastern sector of the plateau, while higher diversity but lower coverage was found in the desert-steppe and steppe-desert in the west, and lower diversity but higher coverage was found in the communities of the Maowusu sandland. From 1986 to 2000, the biodiversity and coverage of the communities had changed ob- viously. The biodiversity of typical steppe, desert-steppe and sandland vegetation showed a decreasing trend, whereas coverage of typical steppe and steppe-desert increased, and the coverage of the desert-steppe de- creased. We recommend that great attention should be paid to the ecological conservation of the desert-steppe as well as to species diversity of sandland vegetation and steppe desert.
Review on the Research for Addition and Subtraction Word Problem Solving
加减文字题解决研究概述

Zhou Xinlin,Zhang Meiling,<br>周新林,
心理科学进展 , 2003,
Abstract: Addition and subtraction word problems refer to a type of mathematical word problems that can be solved by applying addition and subtraction. They can be mainly classified into three categories: combine, change and compare. There are four types of methods to investigate the mental processes: solving problem, recalling and constructing problems, building simulation model of computer, and recording eye-movement. Previous research found that the mental processes could be significantly affected by these factors: semantic type, age, phrase and sentence, narrating format, context personalization, the structure of problem text, number size, the type of unknown set and strategies to solve problems. Researchers mainly proposed two theoretical explanations for the mental processes: mathematical knowledge applying model and language comprehension model .
The Retrieval Features and Application of ISI Web of Knowledge
ISI Web of Knowledge体系检索特色与应用评析

Mo Meiqi Zhang Wei,<br>莫,
现代图书情报技术 , 2003,
Abstract: The paper introduces the retrieval feature and relationship of different databases in ISI Web of Knowledge systematically. It discusses integrated application of based knowledge of academic informatin resources as well.
THE CONCEPTUAL STRUCTURE OF KINSHIP WORDS OF NAXI NATIONALITY
纳西族亲属词的概念结构——兼与汉族亲属词概念结构比较

Zhang Jijia,<br>积家,和秀
心理学报 , 2004,
Abstract: Using the methods of natural classifying and multi-dimensional scale, this paper probed into the conceptual structure of kinship words of Naxi nationality. The subjects were 63 undergraduate students. The results showed that there were 6 categories in the conceptual structure of kinship words of Naxi nationality: (1)parents; (2)elder family members who were the same generation as the parents; (3)brothers and sisters ;(4) brothers and sisters who were connected by marriage; (5)daughter-in-law and son-in-law; (6)grandfathers and grandmothers, children and grandchildren, nephews and nieces. There were two dimensions in the conceptual structure of kinship words of Naxi nationality, one is the same generation/different generation, the other is considerate people/ people who were looked after. There were notable differences between the conceptual structure of kinship words of Naxi nationality and that of Han nationality,these differences came from the languages,family and marriage systems and cultures.
THE ROLE OF PART-WHOLE KNOWLEDGE IN SOLVING ADDITION WORD PROBLEMS
部总知识在解决加法文字题中的作用

Zhou Xinlin,Zhang Meiling,<br>周新林,
心理学报 , 2003,
Abstract: 探讨的问题是部总知识是否制约着算术文字题的解答过程。小学4年级学生(192人)和大学生(178人)被要求解答一步加法文字题。实验结果发现,正确列式方式受到已知客体集合具体特征的系统性影响,尤其是随着年龄的提高和练习程度的深入,这种影响越来越明显。这是部总知识作用假设所不能解释的。现根据集合在心理表征中的位置和表征强度解释结果,并在此基础上讨论了研究的实践意义。
Modified symbolic relative entropy based electroencephalogram time irreversibility analysis
基于改进的符号相对熵的脑电信号时间不可逆性研究

Zhang Mei,Wang Jun,<br>,王俊
物理学报 , 2013,
Abstract: In this letter, we show that the trajectory of electroencephalogram (EEG) possesses the character of time reversal asymmetry, which can provide information about the entropy production of EEG. We develop a kind of new method to estimate symbolic relative entropy and entropy production using forward and backward trajectories. Finally, we use this method to dispose and analyse the EEGs of younger and elder people, and is turned out that this method works and the average energy dissipation can be used as a parameter to detect nonequilibrium.
第1页/共439918条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.