Effect of ionizing radiations on the crystalline structure and electric resistivity of cadmium sulphide thin films

The effect of ionizing radiations on semiconductor thin films has been less investigated.^1.2 In Ref. 1 the authors studied the effect of electron irradiation on the resistivity of thin epitaxial silicon films. The effects of electron irradiation at energies varying between 11 keV and 100 keV confirmed those obtained with monocrystals.³ The variation of electrical conductivity and of the distribution of carriers in the silicon epitaxial thin films due to the simultaneous action of silicon ion implantation and evaporation in vacuum was studied in Ref. 4.     

A methodology for measuring the readability and modifiability of computer programs

This paper describes an experimentally based methodology for investigating how the readability and modifiability of computer programs can be expressed in terms of programming style.As one part of the methodology three different measures of the readability and modifiability of a program are established. The measures are obtained by human gradings or scores. As another part these measures are related to computer-evaluable programming style characteristics. The result is a formula yielding the readability and modifiability as a function of measurable program characteristics.In testing the methodology one experiment provided a formula of readability containing six computer-evaluable programming style characteristics. A further experiment indicated that the general validity of this formula of program readability needs further investigation.     

Sequential generation ofD-optimal input designs for linear dynamic systems

This paper considers the problem of sequentially generating test signals for parameter estimation in linear, single-input, single-output, discrete-time systems using a frequency-domain approach based on the theory of optimal experiments in regression analysis. The input signals are power constrained and are optimal in the sense that system information is maximized, where the criterion employed is the determinant of the Fisher information matrix (D-optimality). A class of algorithms is investigated, each member of which generates a sequence of input designs converging to aD-optimum. A number of these algorithms are compared computationally.     

流体力学实验教学改革的探讨

在传统的实验教学工作中，存在着不少与学生综合能力培养相脱节的问题。为了克服这些不足，本根据我院的特点，对流体力学实验教学改革中应做的工作和相应的措施进行了探讨。     

近代物理实验CAI课件的研究与开发

本结合实例介绍了近代物理实验教学CAI软件的开发过程及制作方法。展看了近代物理实验的CAI课件在实验教学中的优越性及其广阔的应用前景。     

《高分子材料成型加工原理》课程教学改革的探讨

高分子成型加工原理是材料化学专业最重要的专业课程之一。根据课程和材料化学专业对人才需求的特点,在教学过程中调整课程结构,合理组织教学内容,改善教学方法,通过多媒体教学、实验教学、实践教学,以促进学生对专业知识的吸收。为了提高学生独立分析、解决实际问题的能力,加强理论教学和实践教学的结合以及理论教学和科研的结合。从而培养学生对本学科的学习兴趣,并促使其将所学的理论知识应用于生产实践,满足社会对专业人才的需求。     

研究性高分子化学实验课程改革探索

首先论述了研究性高分子化学实验的重要性及其研究现状,根据现有研究的空白,结合具体的高分子化学实验《有机玻璃制备》,详细论述了研究性高分子化学实验各环节的设计、实施及其作用。根据本文可直接实施研究性《有机玻璃制备》实验,并可推广至其他高分子化学实验研究性方案的设计和实施。通过此研究性高分子化学实验课程的改革,不仅提高了学生的动手能力,而且提高了学生独立思考、发现问题的能力,强化了理论与实践的结合,深化理论知识的理解和吸收,综合训练了学生的科学研究能力。     

Overcoming the Trade-Off between C2H2 Sorption and Separation Performance by Regulating Metal-Alkyne Chemical Interaction in Metal-Organic Frameworks

Designing porous materials for C₂H₂ purification and safe storage is essential research for industrial utilization. We emphatically regulate the metal-alkyne interaction of Pd^II and Pt^II on C₂H₂ sorption and C₂H₂/CO₂ separation in two isostructural NbO metal–organic frameworks (MOFs), Pd/Cu-PDA and Pt/Cu-PDA . The experimental investigations and systematic theoretical calculations reveal that Pd^II in Pd/Cu-PDA undergoes spontaneous chemical reaction with C₂H₂, leading to irreversible structural collapse and loss of C₂H₂/CO₂ sorption and separation. Contrarily, Pt^II in Pt/Cu-PDA shows strong di-σ bond interaction with C₂H₂ to form specific π-complexation, contributing to high C₂H₂ capture (28.7 cm³ g⁻¹ at 0.01 bar and 153 cm³ g⁻¹ at 1 bar). The reusable Pt/Cu-PDA efficiently separates C₂H₂ from C₂H₂/CO₂ mixtures with satisfying selectivity and C₂H₂ capacity (37 min g⁻¹). This research provides valuable insight into designing high-performance MOFs for gas sorption and separation.