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Structure Model of Urban Traffic System Evolution 认领 引用
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作者 姜克锦 张殿业 《Journal of Southwest Jiaotong University(English Edition)》 2008年第2期176-181,共6页
A structure model of urban traffic system evolution is built based on the analysis of the factors influencing the system evolution and the hierarchy between the factors. Then the influencing degrees of the factors are... A structure model of urban traffic system evolution is built based on the analysis of the factors influencing the system evolution and the hierarchy between the factors. Then the influencing degrees of the factors are quantificationally analyzed by DEMATE （decision making trial and evaluation laboratory）. The analysis results indicate that the traffic mode structure which achieves the highest central degree is the dominant influencing factor of the urban traffic system evolution, and that economy development and the traffic policy are the second important factors that also affect the Waffle mode structures. Furthermore, physical geography is a basic restriction to the urban traffic system evolution. 展开更多
关键词 Urban system evolution Structural model Influencing factors
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A SYNTHETIC ENVIRONMENT FOR SYSTEM EVOLUTION 认领 引用
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作者 吴洁 丁秋林 韩军 《Transactions of Nanjing University of Aeronautics and Astronautics》 2002年第2期187-191,共5页
Due to the immaturity of practice and the increasing complexity of system of system (SoS). It is necessary to develop systematic methodologies that enable evolution of such systems. This paper presents a prototype des... Due to the immaturity of practice and the increasing complexity of system of system (SoS). It is necessary to develop systematic methodologies that enable evolution of such systems. This paper presents a prototype design for a synthetic system evolution environment (SEE). It outlines the purpose of the environment, describes its concept of operations, details its main functions and processes in utilizing the system architecture knowledge for systems evolution, and introduces its initial high level architecture design.In addition, it also documents the approach for developing the environment. 展开更多
关键词 system evolution system architecture XML
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Message Service System Evolution and General Frameworks 认领 引用
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作者 Li Fengjun Dong Zhenjiang Wang Hongwei 《ZTE Communications》 2009年第3期49-53,共5页
With the development of message service in telecom networks as well as the Internet,multiple message service formats have been emerging,including Short Message Service(SMS),Multimedia Messaging Service(MMS),Mobile Ema... With the development of message service in telecom networks as well as the Internet,multiple message service formats have been emerging,including Short Message Service(SMS),Multimedia Messaging Service(MMS),Mobile Email Message(MEM)and Instant Message(IM).Based on the latest research achievements of OMA CPM Organization and GSMA RCS Organization,the message service evolution may have two phases:Integration and convergence,with corresponding overall framework realization methods. 展开更多
关键词 SMS MMS Message Service System Evolution and General Frameworks IM MEM RCS CPM Figure GSMA MME
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Evolution mechanism of demand for comprehensive transportation system based on metabolic ecology 认领 引用 被引量：1
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作者 邱玉琢 陈森发 陈涛 《Journal of Southeast University(English Edition)》 EI CAS 2009年第2期271-273,共3页
The metabolic evolution model of transportation demand for comprehensive transportation systems is put forward on the basis of a metabolic theory of ecology. In the model, the growth rates or changing rates of transpo... The metabolic evolution model of transportation demand for comprehensive transportation systems is put forward on the basis of a metabolic theory of ecology. In the model, the growth rates or changing rates of transportation volumes for the various transportation modes of a city are determined not only by the GDP per capita which reflects the size of the city itself, but also by the relationship of competition and cooperation among transportation modes. The results of empirical analysis for Chinese cities show that the allometric growth exponent in the equation for the variation rate of passenger demand volume on rail is greater than the predicted value of 1/4 in metabolic ecology, whereas the allometric growth relationship is not so evident in the equation for the variation rate of passenger demand volume on road. The changing rate of road transportation is thus mainly affected by the relationship of competition and cooperation among transportation modes for Chinese cities. 展开更多
关键词 comprehensive transportation system system evolution metabolic allometric growth relationship
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Evolution of vertebrate central nervous system is accompanied by novel expression changes of duplicate genes 认领 引用
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作者 Yuan Chen Yun Ding +4 位作者 ZumingZhang Wen Wang Jun-Yuan Chen Naoto Ueno Bingyu Mao 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2011年第12期577-584,共8页
The evolution of the central nervous system（CNS） is one of the most striking changes during the transition from invertebrates to vertebrates. As a major source of genetic novelties,gene duplication might play an imp... The evolution of the central nervous system（CNS） is one of the most striking changes during the transition from invertebrates to vertebrates. As a major source of genetic novelties,gene duplication might play an important role in the functional innovation of vertebrate CNS.In this study,we focused on a group of CNS-biased genes that duplicated during early vertebrate evolution.We investigated the tempo-spatial expression patterns of 33 duplicate gene families and their orthologs during the embryonic development of the vertebrate Xenopus laevis and the cephalochordate Brachiostoma belcheri.Almost all the identified duplicate genes are differentially expressed in the CNS in Xenopus embryos,and more than 50%and 30%duplicate genes are expressed in the telencephalon and mid-hindbrain boundary,respectively,which are mostly considered as two innovations in the vertebrate CNS.Interestingly,more than 50%of the amphioxus orthologs do not show apparent expression in the CNS in amphioxus embryos as detected by in situ hybridization,indicating that some of the vertebrate CNS-biased duplicate genes might arise from non-CNS genes in invertebrates.Our data accentuate the functional contribution of gene duplication in the CNS evolution of vertebrate and uncover an invertebrate non-CNS history for some vertebrate CNS-biased duplicate genes. 展开更多
关键词 Central nervous system evolution Gene duplication Expression pattern Amphioxus Xenopus
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Stable persistence of relict populations involved evolutionary shifts of reproductive characters in the genus Tanakaea (Saxifragaceae) 认领 引用
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作者 Daiki Takahashi Yuji Isagi +6 位作者 Pan Li Ying-Xiong Qiu Hiroaki Setoguchi Yoshihisa Suyama Ayumi Matsuo Yoshihiro Tsunamoto Shota Sakaguchi 《Journal of Systematics and Evolution》 SCIE CAS CSCD 2022年第6期1405-1416,共12页
Tertiary relicts often show evolutionary stasis in morphology and ecology and have been hypothesized to retain stable population sizes in refugia. However, recent studies have reported that some relicts evolutionarily... Tertiary relicts often show evolutionary stasis in morphology and ecology and have been hypothesized to retain stable population sizes in refugia. However, recent studies have reported that some relicts evolutionarily shifted their physiology, ecology, and morphology and experienced various patterns of demography. To understand the historical survival of relict plants, a multidimensional study investigating the evolution of ecological and morphological traits as well as population demographic history is needed. The genus Tanakaea (Saxifragaceae) comprises two species in China and Japan. These species share most vegetative characteristics and are sometimes treated as a single species. The distribution pattern is relictual, as the populations are confined to small areas in mesic warm temperate forests less influenced by Quaternary glacial climates. Focusing on the relictual plant group, this study tested the hypotheses of evolutionary stasis and population stability in long-term refugia. Genetic analyses using plastome sequences and genome-wide single-nucleotide polymorphisms revealed divergence of the two species approximately 6.8 million years ago and strong genetic differentiation of the regional populations. Demographic analysis revealed that almost all populations retained stable population sizes during glacial–interglacial climate changes, supporting the traditional view. However, morphological assessments revealed a simultaneous shift in breeding systems (from hermaphrodite to dioecyon-clonal to clonal reproduction) in Japanese species and intraspecific differentiation of leaf traits. Therefore, the relict species do not show evolutionary stasis in every aspect. Changes in reproductive characteristics may have contributed to their long-term in situ survival. 展开更多
关键词 East Asia evolutionary stasis hypothesis mating system evolution phylogeography Saxifragaceae Tanakaea tertiary relict plants
Analysis of the Evaluation Mechanism of the Stride Development System of the Enterprise 认领 引用
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作者 Wenbing Wu Mingyu Zhang Min Wang 《Chinese Business Review》 2004年第2期72-77,共6页
on the basis of the self-organizing theories the thesis analyzes how enterprises realize the stride development through the technology stride. At First the thesis sets up the stride development system of enterprises a... on the basis of the self-organizing theories the thesis analyzes how enterprises realize the stride development through the technology stride. At First the thesis sets up the stride development system of enterprises and then the thesis reveals the mechanism that the technology stride will give rise to the stride development of ente^fises. In the end the thesis puts forward the enlightenment for the stride development of enterprises from the stride development system of enterprises. 展开更多
关键词 enterprises stride system evolution
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Rhenium-osmium(Re-Os)geochronology of crude oil from lacustrine source rocks of the Hailar Basin,NE China 认领 引用 被引量：1
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作者 Qi-An Meng Xue Wang +8 位作者 Qiu-Li Huo Zhong-Liang Dong Zhen Li Svetlana GTessalina Bryant DWare Brent IAMcInnes Xiao-Lin Wang Ting Liu Li Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2021年第1期1-9,共9页
Re-Os radiometric dating of crude oil can be used to constrain the timing of hydrocarbon generation,migration or charge.This approach has been successfully applied to marine petroleum systems;however,this study report... Re-Os radiometric dating of crude oil can be used to constrain the timing of hydrocarbon generation,migration or charge.This approach has been successfully applied to marine petroleum systems;however,this study reports on its application to lacustrine-sourced natural crude oils.Oil s amples from multiple wells producing from the Cretaceous Nantun Formation in the Wuerxun-Beier depression of the Hailar Basin in NE China were analysed.Subsets of the Re-Os data are compatible with a Cretaceous hydrocarbon generation event(131.1±8.4 Ma)occurring within 10 Myr of deposition of the Nantun Formation source rocks.In addition,two younger age trends of 54±12 Ma and 1.28±0.69 Ma can be regressed from the Re-Os data,which may reflect the timing of subsequent hydrocarbon generation events.The Re-Os geochronometer,when combined with complementary age dating techniques,can provide direct temporal constraints on the evolution of petroleum system in a terrestrial basin. 展开更多
关键词 Re-Os dating Lacustrine crude oils Hailar basin Petroleum system evolution
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Coastal Dunes Mobility Integration and Characterization:Developing of a Flexible Volume Computing Method 认领 引用 被引量：1
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作者 Benoit Guillot Jonathan Musereau +1 位作者 Bruno Dalaine Joseph Morel 《Journal of Geographic Information System》 2018年第5期503-520,共18页
Coastal dunes are among the most complex interfaces to study in the world. Improving the knowledge of their morphodynamics is essential to better understand the present evolutions and try to anticipate future. The rec... Coastal dunes are among the most complex interfaces to study in the world. Improving the knowledge of their morphodynamics is essential to better understand the present evolutions and try to anticipate future. The recent use of the new vectors that are drones, UAV and UAS, improves the temporal and spatial resolutions of geomatic data acquired on these environments. Many studies attempt to measure the sedimentary variations that occur from one date to another by the use of differential volumes. In particular, they make it possible to understand the roles of storms, sometimes erosive, as well as the possible morphological responses of associated reconstruction periods. One of the primary methods for calculating volume evolutions is the assessment of a vertical delimitation of the dune toe. However, it is difficult to limit mobile and variable environment, temporally and spatially, to a simple vertical topographic delimitation. This study was realized to estimate the error induced by the use of the vertical threshold method. In the examples that were done, this error was far from being negligible and might in some cases exceed the evolutions of measured volumes. In overcoming this problem, an alternative method was developed. It was the seemingly better adaptability to these mobile environments that are the coastal dunes. 展开更多
关键词 Coastal Sand Dune Volume Computing Beach-Dune System Evolution
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系统的稳定性与不稳定性——搅动能守恒律意义和作用的引伸性讨论 认领 引用 被引量：1
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作者 陈刚毅 欧阳伯嶙 +2 位作者 袁东升 郝丽萍 周莉蓉 《中国工程科学》 2005年第8期41-46,65,共6页
讨论了欧阳首承提出的搅动能守恒律意义和作用,并结合曲率空间做了引伸性的讨论,认为搅动能守恒定律是系统稳定性和演化分析的重要原理和方法,它既是解释系统稳定性的原因,也可以作为系统演化分析的方法,并指出了牛顿体系的某些本质性... 讨论了欧阳首承提出的搅动能守恒律意义和作用,并结合曲率空间做了引伸性的讨论,认为搅动能守恒定律是系统稳定性和演化分析的重要原理和方法,它既是解释系统稳定性的原因,也可以作为系统演化分析的方法,并指出了牛顿体系的某些本质性问题。 展开更多
关键词 系统结构 搅动能 稳定性与演化性
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系统科学——从构成论走向生成论 认领 引用 被引量：38
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作者 李曙华 《系统辩证学学报》 2004年第2期5-9,34,共5页
当前 ,构成论和生成论是系统研究中的两条不同道路。作者主张从新的自然观出发 ,创建探索世界生成演化的“生成科学”。并提出以“生成元”作为这一新科学的逻辑起点 ,生成元与“原子”的根本差别在于 :1、生成元是未分化的整体 ,不是... 当前 ,构成论和生成论是系统研究中的两条不同道路。作者主张从新的自然观出发 ,创建探索世界生成演化的“生成科学”。并提出以“生成元”作为这一新科学的逻辑起点 ,生成元与“原子”的根本差别在于 :1、生成元是未分化的整体 ,不是基本构成部分 ;2、生成元可生可灭 ,本质上是过程 ;3、生成元首显“动力因”和“目的因” ,而非质料因 ;4、部分由分化生长而成 ,具有整体性和分形性 ;5、决定生长的是信息 ,而非载体的原子质量。最后对当代生成论与达尔文进化论作一大略的比较。 展开更多
关键词 系统科学 构成论 生成论 进化论 生成元
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试论达尔文进化论在生态学发展中的地位 认领 引用 被引量：1
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作者 刘彤 吐尔逊.玉 +1 位作者 潘志斌 陈芳 《石河子大学学报（自然科学版）》 CAS 2003年第3期211-214,共4页
介绍了现代生态学发展的特点和达尔文的进化论及完善过程,认为达尔义提出的生态思想是朴素的生态观,其进化论是种一种群的进化,从本质上并未涉及到其他生态学等级的进化;必须以普遍联系的系统观和时空观评价生态学发展现状,生态学研究... 介绍了现代生态学发展的特点和达尔文的进化论及完善过程,认为达尔义提出的生态思想是朴素的生态观,其进化论是种一种群的进化,从本质上并未涉及到其他生态学等级的进化;必须以普遍联系的系统观和时空观评价生态学发展现状,生态学研究也必须注重局部各因子之间、整体与局部之间的作用关系。初步探讨了能否象牛顿力学那样将自然选择力作为推动生物进化的“万有引力”的生态学研究问题。 展开更多
关键词 达尔文进化论 生态学 自然选择 自组织 非生命系统 人类进化
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China’s agriculture management and administration system 认领 引用
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作者 Li Zhou 《China Finance and Economic Review》 2014年第4期52-63,共12页
This paper focuses on the evolution of the management and administration of agriculture business,the change to the social background,the management and administration system development and the cultivation of key agri... This paper focuses on the evolution of the management and administration of agriculture business,the change to the social background,the management and administration system development and the cultivation of key agriculture players,i.e.core farm,in China,so as to provide a comprehensive discussion on the management and administration of agriculture business in China. 展开更多
关键词 system evolution social background system construction
新文化观观照下的中国婚姻生育制度与风俗之变迁 认领 引用 被引量：3
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作者 王攸欣 《中国文化研究》 北大核心 2017年第2期76-85,共10页
基因同异创化论新文化观提出:文化是特定基因群体以基因延续机会和相关资源分配为核心的功能性体系。中国传统文化在维持民族基因繁衍方面较为成功。中国近代以来的婚姻生育制度发生重大改变,国家政权介入个体生活的能力强化,带来一系... 基因同异创化论新文化观提出:文化是特定基因群体以基因延续机会和相关资源分配为核心的功能性体系。中国传统文化在维持民族基因繁衍方面较为成功。中国近代以来的婚姻生育制度发生重大改变,国家政权介入个体生活的能力强化,带来一系列的变化,有利有弊,值得高度正视。 展开更多
关键词 基因同异创化论 婚姻 生育
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