化学教学中文献探究教学模式初探

文章对文献探究教学模式的概念、特点、功能、评价以及适用范围进行了介绍;设计出文献探究教学模式在中学化学教学中的使用程序,并且指出了运用文献探究模式教学时需要注意的事项.     

Formation and magnetic properties of Co–Fe-based bulk metallic glasses with supercooled liquid region

A new Co–Fe-based ferromagnetic bulk metallic glass (BMG) was synthesized by copper mould casting method. The thermal stability and crystallization processes were investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The soft magnetic behavior was studied by DC magnetic measurements. The high glass formation ability was interpreted in terms of the effective suppression of nucleation and growth of the intermetallic compounds which appear in the multicomponent system during solidification. The high thermal stability indicates that the new Co–Fe-based BMG could be used as high-temperature magnetic material. The low coercivity which was as low as 8 A/m for the as-cast sample was found in the Co–Fe-based metallic glass cylinder with a diameter of 1.5 mm.     

Entropy and ergodic probability for differentiable dynamical systems and their bundle extensions

We answer a problem of Liao [S.T. Liao, Standard systems of differential equations and obstruction sets—from linearity to perturbations, in: System Researches, Proceedings Dedicated to the 85th Anniversary of Qian Xue-Sen, Zhejiang Education Press, Hangzhou, China, 1996, pp. 279-290 (in Chinese)]: A C¹ vector field or a C¹ diffeomorphism on an n-dimensional manifold has equal entropy with that of its bundle extensions. We also prove that each ergodic probability with simple Lyapunov spectrum has at most n²n! covering probabilities on each bundle extension.     

带有约束的缺省逻辑

提出了一种改进缺省逻辑的方法，讨论了这种缺省理论的性质，证明了每个缺省理论都有扩充，具有半单调性和累积性，并讨论了处理多扩充问题的一种方法．     

L—fuzzy Ring and L—fuzzy Module

Ｌ－ｆｕｚｚｙＲｉｎｇａｎｄＬ－ｆｕｚｚｙＭｏｄｕｌｅＬ－ｆｕｚｚｙＲｉｎｇａｎｄＬ－ｆｕｚｚｙＭｏｄｕｌｅ￥ＳｕｎＲｏｎｇｇｕａｎｇＪｉａｎｇＢａｏｑｉｎｇ（ＨｕｍａｎＵｎｉｖｅｒｓｉｔｙ，Ｋａｉｆｅｎｇ，４７５００１）ＲｅｎＸｕｅｊｕｎ（Ｍｉｎｑ...     

新型稀土电子输运材料Tb(AcA)3·phen

Kido等人在文献[1]中报导,在研究有机电致发光(OEL)器件时发现,斓系化合物不能很好地传输载流子.但是,我们在实验中却现Tb(AcA)3phen·不仅是一种很好的OEL发射材料.而且具有很强的电子输运能力.     

Asymmetric synthesis XXVII: Asymmetric catalytic trimethylsilylcyanation of aldehydes by novel Ti-chiral Schiff base complexes

Enantioselective catalytic trimethylsilylcyanations of aldehydes with 48% to 92% e.e. have been studied using the novel Ti-chiral Schiff base complexes. We have found that the catalyst led to high enantoselectivity when the molar ratio of the Schiff base 1 to Ti(O-i-Pr)₄ was 2:1.     

SOME TOPICS ON WAVELET ANALYSIS

A review of the advance in the theory of wavelet analysis in recent years is given.     

胃癌AgNOR银染色的定量分析研究

应用银胶染色法和计算机图像分析技术,对48例胃粘膜活检标本的石蜡切片进行Ag-NOR形态、定量分析研究。结果表明其对于区别胃疾患的良恶性和判定胃癌的分化程度有重要意义。     

智能CAD／CAM技术对建筑机械业的影响

本文首先介绍ＣＡＤ／ＣＡＭ的产生及发展。然后谈ＣＡＤ／ＣＡＭ对建筑机械业的影响。本主独道见解是：ＣＡＤ／ＣＡＭ技术对建筑机械业影响巨大，一个全新的计算机辅助建筑工程制造ＣＡＥＭ概念将产生。当ＣＡＥＭ实现时，建楼房将象儿童搭积木房子一样轻而易举。“安得广厦万千间，使得天下寒士尽欢颜”梦想会成真。