改性聚丙烯材料裂纹扩展速度的研究

对改性聚丙烯材料的双悬臂梁试样进行了非线性粘弹性的裂纹扩展实验。得到了裂纹扩展全过程的裂纹长度与时间关系的数据，将弹性回复对应原理应用到了非线性粘弹性裂纹扩展分析中，得到了改性聚丙烯材料裂纹扩展速度的理论预测公式，比较发现，理论预测结果和实验数据吻合较好。     

第五种力以及一种可能的检测方法

本文对第五种力的研究概况进行了简单的评述．提出了检测第五种力的一种可能的方法，对其测定原理进行了详细地讨论，为实验工作者检测第五种力提供了一条可能的途径。     

对高师成人钢琴函授课教学的几点思索

在成人函授教育中,钢琴课是较为特殊的,由于它具有独有的技能性、操作性和特有的授课形式等特性,这给制定教学计划和课程安排都带来了一定的困难。因此找准函授学生的知识渴求点,结合函授学生的特点,通过改变教学形式、加强学生综合素质的培养、实际能力的培养、以及开展各种不同形式的专题讲座等形式来切实提高高师成人钢琴函授课的教学质量。     

从合作原则与《弟子规》管窥中西哲学的交融

从某种意义上讲,格赖斯提出的"合作原则"体现了一定的西方哲学思想。《弟子规》作为儒家文化的经典作品,也蕴含着东方哲学思想。研究表明,"合作原则"和《弟子规》所蕴含的思想存在着某些相似与关联。宏观上讲,合作原则推崇的是一种人与人之间在交际过程中的"合作"态度,这与儒家提倡的"天人合一"中的"和"是相通的。微观上讲,合作原则中的数量、质量与方式准则与《弟子规》中的一些观点也是吻合的。     

Inter-theory relations in quantum gravity: Correspondence,reduction, and emergence

Relationships between current theories, and relationships between current theories and the sought theory of quantum gravity (QG), play an essential role in motivating the need for QG, aiding the search for QG, and defining what would count as QG. Correspondence is the broad class of inter-theory relationships intended to demonstrate the necessary compatibility of two theories whose domains of validity overlap, in the overlap regions. The variety of roles that correspondence plays in the search for QG are illustrated, using examples from specific QG approaches. Reduction is argued to be a special case of correspondence, and to form part of the definition of QG. Finally, the appropriate account of emergence in the context of QG is presented, and compared to conceptions of emergence in the broader philosophy literature. It is argued that, while emergence is likely to hold between QG and general relativity, emergence is not part of the definition of QG, and nor can it serve usefully in the development and justification of the new theory.     

狭义相对论质量公式的验证

一般教材中狭义相对论质量公式的推导比较复杂繁琐而不便于学生理解掌握,本文提出一种间接的验证方法,以其对教学有一定的参考价值。     

“真”是否有本质——基于真理符合论与紧缩论的比较

传统意义上的真之符合论把"真"理解为思想与世界的关系,强调"真"的属性与作用;真之紧缩论则以真的透明性为直觉,涵盖了包括弗雷格紧缩思想、冗余论、代语句理论和极小主义理论在内的几种理论,这些理论的核心思想认为真谓词仅仅起着逻辑句法作用,它的出现不能给语句增添任何实体属性。于是,"真是否有本质"成为符合论与紧缩论争论的焦点,这一争论也成为区分不同真之理论的新标准。     

Waiting for Landauer

Landauer's Principle asserts that there is an unavoidable cost in thermodynamic entropy creation when data is erased. It is usually derived from incorrect assumptions, most notably, that erasure must compress the phase space of a memory device or that thermodynamic entropy arises from the probabilistic uncertainty of random data. Recent work seeks to prove Landauer's Principle without using these assumptions. I show that the processes assumed in the proof, and in the thermodynamics of computation more generally, can be combined to produce devices that both violate the second law and erase data without entropy cost, indicating an inconsistency in the theoretical system. Worse, the standard repertoire of processes selectively neglects thermal fluctuations. Concrete proposals for how we might measure dissipationlessly and expand single molecule gases reversibly are shown to be fatally disrupted by fluctuations. Reversible, isothermal processes on molecular scales are shown to be disrupted by fluctuations that can only be overcome by introducing entropy creating, dissipative processes.     

Time isotropy,Lorentz transformation and inertial frames

Homogeneity of Euclidean space and time, spatial isotropy, principle of relativity and the existence of a finite speed limit (or its variants) are commonly believed to be the only axioms required for developing the special theory of relativity (Lorentz transformations). In this paper, however, it is pointed out that the Lorentz transformation for a boost cannot actually be derived without the explicit assumption of time isotropy (viz. time-reversal symmetry) which is logically independent of the other postulates of relativity. Postulating time isotropy also restores the symmetry between space and time in the postulates of relativity (i.e. time and space share the same symmetries then). Time isotropy also helps explain naturally one key general feature of the fundamental physical laws, viz. their time-reversal symmetry. But inertial frames are defined in influential texts as frames having space-time homogeneity and spatial isotropy only. Inclusion of time isotropy in that definition is thus suggested.     

全人类共同利益原则的现实悖论

被部分学者所倡导的全人类共同利益原则与国际法的理论基石——国家主权的矛盾不可调和,且没有得到充分的国际法文件确认和国际社会的普遍公认,在事实上也只维护全人类的总体利益而非全体利益,故而遭遇诸多理论障碍和现实悖论,不能成为国际法的基本原则。全人类共同利益原则在现阶段更多地体现为一项国际法理念或国际道德。