略论自组织理论中的有序与无序问题

略论自组织理论中的有序与无序问题张青棋（安徽大学哲学系自然辩证法教研室合肥２３００３９）有序和无序问题本来是自然科学研究的对象，由于它具有普适性，因此，近些年来颇为哲学家所重视。许多学者认为，有序和无序可以从自然科学概念中抽取出来，作为唯物辩证法的基...     

创新理论在高校人事工作中的建立和运用

高校要在未来的科技、人才、就业市场经受考验,首先要解决的是高校人事人才创新问题.本文从思想观念创新、分配激励制度创新、用人管理机制创新三个方面,对创新理论在高校人事人才工作的建立和运用进行了初步探讨.     

从认同到建构—当代学习模式的转换

学习模式与教育方式相辅相成，密不可分，工具性教育导致了一味灌输的接受认同式学习模式，它不能适应新世纪人类及社会发展的需要，新的历史条件下，必须改变以往单纯的化占有式思维，形成一种以化批判与生成为机制的建构性学习模式，这才是当代学习理论探究中必须首先解决的问题。     

高考数学的一个新亮点——猜想题

猜想是对所要研究的问题依据已有材料、条件和知识，进行实验、观察、分析、比较、联想、类比、归纳、推理等，作出符合一定的经验与事实的推测性想象的思维方法．牛顿指出：“没有大胆的猜想，就做不出伟大的发现”。猜想是发现问题、解决问题的一种重要的思维方法，是创新思维的重要组成部分，猜想也是数学发展的动力，数学理论的重大突破往往起源于立意深邃的猜想，正是无数数学家们的猜想，数学科学才发展到当今的现代数学。由于猜想可让学生体验数学发现和创造的历程，培养和发展他们的创新思维和合情推理能力，更能体现高考的选拔功能，因此近几年猜想题倍受高考命题老师的亲睐，成为高考数学题的一个新亮点．本文试对这类题型及解法作一综述，供参考．     

Theoretical Research on a Kind of Quantum Left-handed Metamaterial

Recently, research on left-handed materials （LHMs） has attracted considerable attentions. The LHMs are a kind of metameterial which have negative permittivity and negative permeability, which lead to negative refractive index in a frequency range. The LHMs that have been available so far are in the microwave range and are usually composed of classical particles, such as split-ring resonators. Some quantum phenomena such as spontaneous emission of atoms in the LHMs which are considered to be ＇classical background＇ have also been investigated. Many potential applications of LHMs have been proposed, such as superlenses which, in principle, can achieve arbitrary subwavelength resolution.     

A Reliability Analysis of Calculated Results for Odd-Even and Odd-Odd Nuclei in Relativistic Mean-Field Theory

We calculate the binding energies of Ni, Cu, Xe, Cs, Pt, Au, Np, Pu isotope chains using two interaction parameter sets NL-3 and NL-Z, and compared the relative errors of the even-even nuclei with those of odd-even nuclei and odd-odd nuclei. We find that the errors of binding energy of odd-even and odd-odd nuclei are not bigger than the one of even-even nuclei. The result shows that comparing with even-even nuclei, there is no systematic error and approximation in the calculations of the binding energy of odd-even and odd-odd nuclei with relativistic mean-field theory. In addition, the result is explained theoretically.     

Advances in micro-perforated panel absorbers

Theoretical and experimental investigations on the performance of micro-perforated -panel absorbers are reviewed in this paper. By reviewing recent research work, this paper reveals a relationship between the maximum absorption coefficient and the limit of the absorption frequency bandwidth. It has been demonstrated that the absorption frequency bandwidth can be extended up to 3 or 4 octaves as the diameters of the micro-holes decrease. This has become possible with the development of the technologies for manufacturing micro-perforated panels, such as laser drilling, powder metallurgy, welded meshing and electro-etching to form micrometer order holes. In this paper, absorption characteristics of such absorbers in random fields and in high sound intensity are discussed both theoretically and experimentally. A new absorbing structure based on micro-perforated-panel absorbers demonstrate experimentally high sound absorption capability. This review shows that the micro-perforated-panel absorber has potentials to be one of ideal absorbing materials in the 21st century.