检索结果-南通市图书馆

华南师范大学学报(自然科学版) 2018年第4期50卷 10-16页

作者：王桓水玲玲孟庆元李笑然 Nicolass frans DE ROOIJ 周国富电子科技大学中山学院华南师范大学华南先进光电子研究院∥广东省光信息材料与技术重点实验室∥彩色动态电子纸显示技术研究所深圳市国华光电科技有限公司深圳市国华光电研究院

替代数据法是非线性系统分析的一种有效方法.该方法不能直接判断信号是否处于混沌状态,而是基于排除法思路,提高混沌识别的置信度.文中引入一种针对类周期信号混沌识别的伪周期替代数据法,在数值实验中发现了该算法的3个缺陷:一是相空... 详细信息

替代数据法是非线性系统分析的一种有效方法.该方法不能直接判断信号是否处于混沌状态,而是基于排除法思路,提高混沌识别的置信度.文中引入一种针对类周期信号混沌识别的伪周期替代数据法,在数值实验中发现了该算法的3个缺陷:一是相空间重构在实际信号分析中效果不佳;二是替代数据直线化;三是检验统计量容错性较差.针对这些问题分别提出了改进方法.使用改进算法对不同类别信号(包括由Logistic模型产生的周期信号和混沌信号以及其它典型混沌信号等)进行数据实验.发现所有混沌信号在各噪声半径下的复杂度都呈线性增长趋势;而周期信号在噪声半径小于0.1时,复杂度的取值保持平稳,噪声半径大于0.1时,复杂度取值开始单调增长.对数据实验的结果分析表明:在各噪声半径下复杂度的线性增长趋势是混沌信号的共同特征,可作为一种有效的图形化混沌判据.

关键词：混沌替代数据法类周期信号噪声半径复杂度

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Mn＋1AXn Phonon Density of States： Ti3AlC2 and Ti3SiC2 Simulation and Experimentation Results

引用

Journal of Chemistry and Chemical Engineering 2015年第4期9卷 253-261页

作者： Veronica Gray Gordon J Kearley Oliver Kirstein Ramzi Kutteh Erich H Kisi Daniel P. Riley frans Trouw School of Engineering University of Newcastle Callaghan NSW 2308 Australia Bragg Institute Australian Nuclear Science & Technology Organisation Lucas Heights NEW 2234 Australia European Spallation Source ESS AB Lund 22100 Sweden School of Physics University of Sydney Sydney NEW2006 Australia Institute of Materials Engineering Australian Nuclear Science & Technology Organisation Lucas Heights NEW2234 Australia Lujan Centre Los Alamos Neutron Science Center Los Alamos National Laboratory Los Alamos NM 87545 USA

For the first time detailed measurements of the DOS （density of states） for Ti3AIC2 and Ti3SiC2 are presented at temperatures between T = 10 and 100 K. For Ti3AIC2 a DFT （density functional theory） simulation of lattice dynamics is compared to experimental data demonstrating a noticeable difference between the spectra especially below 40 meV. In the case of Ti3SiC2 the DFT model is augmented with MD （molecular dynamics） simulations resulting in the measured and simulated spectra resembling one another more closely but still having significant differences below 40 meV. Within the experimental spectra, there are features up to and including 20 meV which are unaccounted for by the simulation. Tracing individual atoms generated by the computer models suggests anharmonic motion of Si within the Ti3SiC2. The results presented could explain differences between calculated elastic moduli using DFT harmonic lattice dynamics simulations and results from recent experiments.

关键词： Anharmonic anisotropic lattice dynamics Mn+1AXn phase ceramics ab initio molecular dynamics.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

前海腾讯五带一城

引用

城市环境设计 2023年第3期143卷 204-211页

作者：尼尔逊郑宇淇黄盟金振科 Giedrius Mamavicius Junsik Oh Connor Sullivan Natasha Trice Gabriele Ubarevi?iūté 岳阳 frans Parthesius

腾讯公司成立于1998年,目前是世界上最大的互联网公司之一。出于对未来发展的预期,腾讯决定为其员工开发一个新园区。在设计竞赛中,我们遇到了几个问题:如何制定一个总体规划来展示腾讯的形象,同时随着时间的推移实现最大的灵活性?如何...

腾讯公司成立于1998年,目前是世界上最大的互联网公司之一。出于对未来发展的预期,腾讯决定为其员工开发一个新园区。在设计竞赛中,我们遇到了几个问题:如何制定一个总体规划来展示腾讯的形象,同时随着时间的推移实现最大的灵活性?如何为一家结构变化比设计总体规划更快的公司制定总体规划?如何让更多的公众能够接触到中国的创新产业?

关键词：

来源：

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Are type IV pili involved in <i>Vibrio anguillarum</i>virulence towards sea bass (<i>Dicentrarchus labrax</i>L.) larvae?

引用

Agricultural Sciences 2013年第6期4卷 30-38页

作者： Ingeborg frans Pieter Busschaert Kristof Dierckens Chris W. Michiels Kris A. Willems Bart Lievens Peter Bossier Hans Rediers Centre for Food and Microbial Technology M2S KU Leuven Leuven Belgium Laboratory for Process Microbial Ecology and Bioinspirational Management (PME&BIM) Thomas More Mechelen Campus De Nayer Department of Microbial and Molecular Systems (M2S) KU Leuven Association Sint-Katelijne-Waver Belgium Scientia Terrae Research Institute Sint-Katelijne-Waver Belgium Laboratory for Process Microbial Ecology and Bioinspirational Management (PME&BIM) Thomas More Mechelen Campus De Nayer Department of Microbial and Molecular Systems (M2S) KU Leuven Association Sint-Katelijne-Waver Belgium Scientia Terrae Research Institute Sint-Katelijne-Waver Belgium Centre for Food and Microbial Technology M2S KU Leuven Leuven Belgium Laboratory of Aquaculture & Artemia Reference Center Department of Animal Production Ghent University Ghent Belgium Laboratory of Aquaculture & Artemia Reference Center Department of Animal Production Ghent University Ghent Belgium

Vibrio anguillarum, an important bacterial fish pathogen, expresses a variety of virulence factors contributing to its ability to cause vibriosis in fish. Many virulence factors of this pathogen remain however unknown. For example, a type IV pilus system was previously reported to be potentially involved in the virulence of this bacterium but no experimental evidence was reported yet. In this study, complete genome sequencing of V. anguillarum strain VIB15, shown to be highly virulent towards sea bass (Dicen- trarchus labrax L.) larvae, revealed the presence of a PilA pilin. A V. anguillarum VIB15 pilA mutant was constructed and the pathogenicity of this mutant was assessed in a gnotobiotic sea bass system developed for virulence screening. Our results suggest that the V. anguillarum pilA gene is not crucial for virulence towards sea bass larvae. Possibly, another type IV pilus system identified in V. anguillarum, showing homology to the mannose-sensitive hemagglutinin pilin of Vibrio cholerae, may complement the pilA mutation. Alternatively, the type IV pilus system has a role in infection of juvenile or adult fish, rather than in the larval phase. As such, further research is required to unravel the potential role of type IV pili in V. anguillarum virulence.

关键词： Virulence Vibrio anguillarum Fish Pathogen Type IV Pili

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

最后的真实非洲

引用

时尚旅游 2007年第6期 152-163页

作者： ChristineK.Eckstrom frans Lanting 刘川枫

在赞比亚游客罕至、野生动物丰富的卢安瓜峡谷老式的丛林探险仍然盛行如果狮子们朝我们跃过来.不要动,"罗宾·珀普悄声对我说:"听我指示行事。"他的眼睛转向狮群,一共是3只母狮.6只幼狮,就在我们前方20码的地方。我们这是徒步旅行,周围... 详细信息

在赞比亚游客罕至、野生动物丰富的卢安瓜峡谷老式的丛林探险仍然盛行如果狮子们朝我们跃过来.不要动,"罗宾·珀普悄声对我说:"听我指示行事。"他的眼睛转向狮群,一共是3只母狮.6只幼狮,就在我们前方20码的地方。我们这是徒步旅行,周围也没有任何可供攀爬的树木。狮子们一直死盯着我们,耳朵高高竖

关键词：探险游野生动物赞比亚德里克

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Effect of Curcumin on Patients with Chronic Fatigue Syndrome/Myalgic Encephalomyelitis: An Open Label Study

引用

International Journal of Clinical Medicine 2018年第5期9卷 356-366页

作者： C. (Linda) M. C. van Campen K. Riepma frans C. Visser Stichting Cardiozorg Hoofddorp Netherlands Curesupport Valkenburg Netherlands

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), recently renamed as systemic exertion intolerance disease (SEID), is a chronic and often disabling disease. Although the exact pathophysiological mechanism of ME/CFS is unknown, immunological abnormalities may play an important role. Curcumin is a herb with powerful anti-oxidative, and anti-inflammatory properties. Therefore, we hypothesized that curcumin has favorable effects on symptomatology in ME/CFS patients. In total 52 patients participated, nine stopped the use of curcumin because of side effects. All remaining patients (n = 43) met the criteria for CFS;72% met the criteria for ME. Before and 8 weeks after the use of curcumin complexed with phosphatidyl choline, 500 mg bid, the CDC inventory for assessment of Chronic Fatigue Syndrome was filled in. The CDC questions (n = 19) were scored and divided into 2 parts: the first being specific for CFS complaints (n = 9), the second being scores of less specific symptoms (n = 10);denoted as CDC rest score. Results showed that 8 weeks curcumin use significantly decreased the CFS related symptom scores, but not the CDC rest scores. Analyzing the data separately for ME and CFS patients, the same significance for the CFS symptom scores was present. Conclusion: in this open-labeled study, 8 weeks curcumin use in a phosphatidyl choline complex reduced ME/CFS symptomatology. Therefore, a randomized placebo controlled study is warranted to assess its efficacy in ME/CFS patients.

关键词： Curcumin Chronic Fatigue Syndrome Myalgic Encephalomyelitis CDC CFS Symptom Inventory

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于异常和特征的入侵检测系统模型

引用

计算技术与自动化 2004年第3期23卷 19-22页

作者： frans David 王建新王斌中南大学信息科学与工程学院湖南长沙410083

目前大多数入侵检测系统(Intrusion Detection System,IDS)没有兼备检测已知和未知入侵的能力,甚至不能检测已知入侵的微小变异,效率较低.本文提出了一种结合异常和特征检测技术的IDS.使用单一技术的IDS存在严重的缺点,为提高其效率,唯... 详细信息

目前大多数入侵检测系统(Intrusion Detection System,IDS)没有兼备检测已知和未知入侵的能力,甚至不能检测已知入侵的微小变异,效率较低.本文提出了一种结合异常和特征检测技术的IDS.使用单一技术的IDS存在严重的缺点,为提高其效率,唯一的解决方案是两者的结合,即基于异常和特征的入侵检测.异常检测能发现未知入侵,而基于特征的检测能发现已知入侵,结合两者而成的基于异常和特征的入侵检测系统不但能检测已知和未知的入侵,而且能更新基于特征检测的数据库,因而具有很高的效率.

关键词： IDS 基于特征入侵检测系统模型特征检测异常检测数据库解决方案严重发现变异

来源：

维普期刊数据库

同方期刊数据库评论