共查询到20条相似文献，搜索用时 78 毫秒
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下荆江河流是一个耗散系统,其平面形态具有分形结构,这种分形结构形成的物理机制之一是河流系统内部诸因素之间（如河床与含沙水流）及河流内部与外部环境（如流域）因素之间存在复杂的非线性依存关系和非线性相互作用,系统外界的扰动如洞庭湖顶托或各种人类活动（如沿江围垸）等是下荆江河型突变的触发力量。 相似文献
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河流水沙时间序列是随机过程,为探讨它们对蜿蜒河流分形结构形成和演变的影响,分析计算了这些随机过程的数值特征和涨落规律。研究发现,这些随机过程的涨落及二阶矩随时间变化的幂律振荡在下荆江这类蜿蜒河流分形结构的形成和演变中具有重要的调制作用。 相似文献
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运用耗散结构理论指导化学教学 总被引：1，自引：0，他引：1
1969年比利时学者普利高津首先提出和创立了“耗散结构”概念和理论。耗散结构理论认为:一个远离非平衡状态的开放系统,只要通过不断交换物质与能量,在外界条件变化达到一定的阈值时,系统可以产生突变,从原有的混沌无序状态转变为更高级的有序状态,有序的组织可以通过一个自组织过程从无序和混沌中自发地产生出来,这种在远离平衡情况下形成的新的有序结构,依靠不断地耗散外界的物质和能量来维持,即为耗散结构。现代教育科学研究认为,人脑系统是一个耗散结构,伴随着负熵的输入,就会导致系统处于非平衡态,进而能有效地吸纳新知识,解决新问题,… 相似文献
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教育开放是现代教育研究中的一个热点。本文借助耗散结构论的观点对教育开放机制进行了分析探讨,指出中国教育要实现新的变革、新的“飞跃”,必备的前提条件是:教育系统必须为“开放系统”,系统的状态应是“远离平衡”,系统走向有序必须引入“负熵”,系统的结构应是“耗散结构”。 相似文献
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基于耗散结构理论视角的德育系统研究 总被引：2，自引：0，他引：2
吴岳军 《扬州大学学报(高教研究版)》2010,14(2):39-42
德育系统具有耗散结构的开放、非平衡性、非线性、涨落四个特征。耗散结构理论对德育系统的启示就是,通过引入负熵、打破静止、建立自催化机制和创造有利的涨落,使德育系统由不稳定状态跃迁到一个新的有序状态。 相似文献
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物理图形具有形象、直观的特点,如果在物理解题中能够巧妙利用物理图形,可以启迪学生的思维,达到化难为易、曲径通幽的效果。但任何一个宏观的物理过程、微观的物质结构都要占据一定的空间,任何物体或场都有一定的几何形状,即有一定的空间维数,其按空间划分可分为立体图形和平面图形。一般来讲,立体图形比平面图形要复杂得多, 相似文献
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郝从容 《山西大学师范学院学报》2010,(1):66-68
熵增原理,揭示了自然界物质能量转化的趋向总是自发地从能量集中转向能量分散,从有序趋向无序的退化。当今的旅游目的地生态系统也存在着熵增现象。鉴于旅游目的地生态系统是一个多成分、多变量、具有耗散机构的开放系统,此无序状态并非无可救药。通过从自然界、社会管理各部门和信息舆论引入负熵流,使之在旅游目的地生态系统内部流通、转化、做功,并以各种形式消耗散失,可以降低系统的总熵,使系统设法处于有序状态,并保持其相对稳定性。因此,在实施旅游目的地的管理时,应该正确理解该环境下的熵增现象,以耗散结构原理为指导,克服组织的混乱,把握系统趋向有序运作。 相似文献
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耗散结构理论认为：一个远离平衡状态的开放系统,只要通过不断交换物质与能量,在外界条件变化达到一定的阈值时,系统可以产生突变（实际上是一次飞跃——质变）,从原有的混沌无序状态转变为更高级的有序状态,有序的组织可以通过一个自组织过程从无序和混沌中自发地产生出来,这种在远离平衡情况下形成的新的有序结构,依靠不断地耗散外界的物质和能量来维持,以实现效率的提升．耗散结构理论推出后, 相似文献
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在竖直平面内做圆周运动的习题类型中,如:水流星、绳拉小球、圆轨道、双园环轨道等,给学生的印象是它们的物理最高点和几何最高点都重合在一起,如果给学生形成了思维定式,给解决实际问题就造成了思维上的障碍. 在竖直平面内的圆周运动中,何为几何最高点、何为几何最低点?作为高中生这个好理解.那么,如何理解物理最高点、如何理解物理最低点呢?我认为:在竖直平面内的圆周运动中,沿合力的方向最容易脱离轨道的那个点也是速度最小的点,即为物理最高点,与物理学最高点对称的点也是速度最大的点为物理最低点.物理最高点的特点是:在竖直平面内做圆… 相似文献
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世界上每年约有160亿立方米的泥沙被河流冲入海中。这些泥沙随着水流从上游移到下游,由于下游河床逐渐变宽,水流速度逐渐减慢,水流对泥沙的搬运能力减小,就不断 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献