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A REVIEW OF PALAEOCLIMATIC IMPLICATIONS FROM LAMINATED TUFA AND TRAVERTINE
层状钙华及其地球化学指标的古气候/环境意义

Yan Hao,Liu Zaihua,<br>,刘再华
第四纪研究 , 2011,
Abstract: It is wildly accepted that tufa and travertine with laminae can be used for high-resolution reconstruction of Quaternary paleoclimate.Alternating laminae of dense micrite and porous calcites,combined with stable isotope(δ18 O and δ13 C )and trace elements from recent tufa show seasonal changes which reflect the climatic information.These alternating laminae have been interpreted to represent seasonally controlled differences in the rate of calcification and/or biotic activity of microbes.Variability in δ18 O is driven mainly by changes in water temperature and the δ18 O value of the recharging water,while evaporation,especially in arid climates,also needs to be accounted.Variability in δ13 C reflects principally the relative contribution of isotopically different carbon origins to dissolved inorganic carbon(DIC).CO2 degassing as well as aquatic photosynthesis can take up 12 C-enriched CO2 in water and thus leave isotopically heavier DIC,which can also be given rise to by precipitation of calcite along the stream or river flow path.Meanwhile,the contents of trace element(e.g.Mg,Ba,Sr)in tufa are supposed to be related to temperature,their concentration in water and rainfall.However,whether aggrading neomorphism and reprecipitation change isotope record of tufa,and reliable chronologies need further research.In a word,as these deposits accumulate rapidly,laminated tufas and travertines offer an excellent opportunity to study seasonality in Quaternary palaeoclimate,and may become a promising record in future research.
知识管理活动创新性研究之协同知识管理
胡昌平,
中国图书馆学报 , 2007,
Abstract: 协同知识管理是指:连接组织内部各个部门或人员,整合组织内部知识资源,协调组织内部各类系统,使其长期合作,促进知识管理目标的实现,使知识管理的各个环节都能以整体效益最大化的方式运作。协同知识管理模型有3个要素:协同工作环境,技术支持与资金保障,人际互动与企业文化。图1。参考文献6。
一类二维动力系统的稳定性及分叉分析
胡军,
中南民族大学学报(自然科学版) , 2014,
Abstract: 考虑一类由二阶二次差分方程简化而成的二维动力系统,运用Jury 条件和稳定性理论研究其动力学行为,分析该系统两个不动点的局部稳定性及其分叉现象,利用数值模拟验证了结果的正确性.最后,应用中心流形 定理确定系统不动点在发生Flip分叉时的临界稳定性.
层状钙华及其地球化学指标的古气候/环境意义
,刘再华
第四纪研究 , 2011, DOI: 10.3969/j.issn.1001-7410.2011.01.12
Abstract: 层状钙华作为高分辨率古气候环境重建记录已被国内外许多学者所关注。钙华的微层厚度、氧碳同位素组成和微量元素的含量都呈现出随季节变化的周期性特点。钙华年层的形成与方解石沉积速率或者微生物生长活性的季节变化有关;氧同位素组成的变化主要受温度和沉积水体的δ18O控制,但蒸发作用(尤其是在干旱区)也有重要影响;钙华的稳定碳同位素组成主要反映了不同δ13C的碳源对水体溶解无机碳(DIC)的贡献。CO2的逸出和水生植物的光合作用会带走水中的12C,从而使δ13CDIC值增加。此外,钙华中的Mg,Ba和Sr等微量元素的含量与它们在水中的浓度和水温以及降雨量有关。然而,在钙华的高精度测年以及加积作用和再沉淀对同位素组成的影响等方面还需做进一步的研究。总之,层状钙华因其高沉积速率而在第四纪高分辨率古气候重建中有独特的优势,有可能成为第四纪研究的又一热点。
ADSORPTION OF GLYCINE ON Cu(111) INVESTIGATED BY SCANNING TUNNELING MICROSCOPY
甘氨酸在Cu(111)表面吸附的扫描隧道显微镜研究

YAN HAO,ZHAO XUE-YING,ZHAO RU-GUANG,YANG WEI-SHENG,<br>,赵学应,赵汝光,杨威生
物理学报 , 2001,
Abstract: The adsorption behaviours of glycine on Cu(111) have been investigated under ultra-high vacuum conditions at room temperature using scanning tunneling microscopy(STM). At lower coverage, it has been found that glycine can form only a two-dimensional gas phase on the Cu(111) surface. When the coverage is high enough, glycine will form a two-dimensional solid phase, i.e., the (4×8) superstructure. Two possible models have been proposed for the (4×8) superstructure. The models can explain STM images well. In addition, in a coverage range between those of the gas and solid phases, two intermediate phases are formed depending on different conditions of deposition and annealing. One is a stripe structure; the other is a hexagonal structure. To understand these intermediate phases further investigations are needed.
Program similarity detection approach based on static lexical tree
一种基于静态词法树的程序相似性检测方法*

XIONG Hao,YAN Hai-hu,HE Jian-ying,ZHAO Chang-hai,<br>熊,海华,赫建营,赵长海
计算机应用研究 , 2009,
Abstract: 传统的程序相似性检测工具并不能有效地检测出一些常见的高级词法、语义理解变换的抄袭方式。首先归纳了学生常用的三类抄袭手段,然后给出了基于词法树的程序相似性检测方法。以C语言为例,总结了生成词法树的结构体,并对程序的词法树进行主数据流、结构控制流和时序流分析后得出结构体依赖图;使用形式化的图同型方法来判断代码是否相似,还给出了一个聚类方法以获得彼此相似的程序子集。通过与JPlag、BuaaSim系统针对一组典型的抄袭样本集进行评测结果对比,本方法具有更好的检测效果。
Traffic Equilibrium Based on Multi-Agents System in Active Network
主动网络中基于多代理系统的流量均衡*

XU Wu-ping,Yan Pu-liu,XIA De-lin,WU Ming,JIANG Hao,ZHOU Xiao-ping,<br>徐武平,蒲柳,夏德麟,吴明,,周小平
计算机应用研究 , 2005,
Abstract: ATEC (Active Traffic Equilibrium Control) is a mechanism which control network performance based on multi-agents system in active network.ATEC combines multi-path routing with resource allocation,and based on equilateral performance strategy,realizes balance of network traffic and bandwidth resource,so that congestion can be avoided or reduced,and network performance can be improved.In this paper,implementation frame is introduced,including arithmetic,general model,design of agents and cooperating model.Finally,a result of simulation is given.
Code Similarity Detection:A Survey
代码相似性检测技术:研究综述

XIONG Hao,YAN Hai-hua,GUO Tao,HUANG Yong-gang,HAO Yong-le,LI Zhou-jun,<br>熊,海华,郭涛,黄永刚,郝永乐,李舟军
计算机科学 , 2010,
Abstract: Identifying program code similarity is to measure similar degree between codes with a kind of detection method, which is very important in the fields of computer science education and intellectual property protection. We introduced the research purpose, the history and some conceptual models of code similarity detection. By analyzing several approaches of code similarity detection, the characteristic of each method was summarized. hhen we discussed some code similarity based researches. Finally, the conclusion of the problems in current technologies was given before the discussion about some promising tendency of code similarity detection.
Code Similarity Detection Approach Based on Back-propagation Neural Network
一种基于BP神经网络的代码相似性检测方法

XIONG Hao,YAN Hai-hu,HUANG Yong-gang,GUO Tao,LI Zhou-jun,<br>熊,海华,黄永刚,郭涛,李舟军
计算机科学 , 2010,
Abstract: It is very important to find plagiarized programs in the field of computer science education.Traditional metho-ds for program similarity use attribute counting or structure information to detect plagiarism.This paper presented a program similarity detection approach based on back propagation (BP algorithm) multi-layer feed-forward neural networks.We extracted seven compared features of the code as the input of the neural network,and obtained the program similarity through the network calculation.Comparing t...
An Image Processing-Based Method to Measure Antibiotic Potency
基于图象处理的抗生素效价测量方法研究

YAN Yang,<br>
中国图象图形学报 , 2000,
Abstract: A computer automated system for measuring antibiotic potency is introduced in this paper. Based on the gray level histogram, an adaptive thresholding technique for image segmentation is used in the system. Furthermore, appropriate pre processing algorithms are adopted to improve the precision of segmentation, and filter rules are proposed to remove fake object. Finally, the antibiotic potency is calculated according to the biological assay theory.
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