“文章原型阅读”单元样章(上)

由上海教育出版社组织编写的国家新课程标准高中语文课本（试编本），经过近两年的艰苦工作，已接近尾声。从本期开始，本刊陆续刊登该课本的试编样章，目的是促进我国的语文教材建设。我们欢迎各界人士提出批评，尤其期盼高中语文教师提供实地试教的反馈意见和建议。

Cracking behaviors and crack control of self-consolidating concrete: a review of literature

Cracking in concrete occurs from volumetric instability, mechanical loading, and/or environmental attack. Compared to conventional vibrated concrete, self-consolidating concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. To obtain a better understanding of self-consolidating concrete cracking behaviors for designing and constructing crack-controlled structural elements, reported current research and practices are reviewed and analyzed in this paper. It has been believed that when well designed and welt constructed, high quality self- consolidating concrete can be successfully used in various structures with cracks properly controlled.

Setup and application of a structural seismic hybrid simulation system on local area network

To implement structural hybrid simulation independent of the control system of any testing equipment in civil engineering, an external command control approach is put forward. Several setup technologies and the corresponding API approaches are investigated to simultaneously combine numerical simulation with physical testing. Hybrid program technology is put forward and described in detail, using Visual C++ program to effectively and accurately control testing equipment and MATLAB program to implement numerical simulation with easy extension. The control program of testing equipment and numerical simulation program are integrated by calling MATLAB engine in Visual C++. A hybrid simulation about a full-scale six-story masonry structure is carried out. The testing results manifest that the external command control approach has the versatility because of simple hardware connection and control program independent on control software of testing equipment; powerful program function of Visual C++ and flexible program of MATLAB are integrated by hybrid program technology; hybrid simulation system provides a realistic and cost-effective testing platform that enables earthquake engineer researchers to accurately and efficiently capture the seismic performance of large or complex structures without having to carry out physical testing of the entire structure.

A blind source separation algorithm based on negentropy and signal noise ratio

A novel blind source separation （BSS） algorithm based on the combination of negentropy and signal noise ratio （SNR） is presented to solve the deficiency of the traditional independent component analysis （ICA） algorithm after the introduction of the principle and algorithm of ICA. The main formulas in the novel algorithm are elaborated and the idiographic steps of the algorithm are given. Then the computer simulation is used to test the performance of this algorithm. Both the traditional FastlCA algorithm and the novel ICA algorithm are applied to separate mixed signal data. Experiment results show the novel method has a better performance in separating signals than the traditional FastlCA algorithm based on negentropy. The novel algorithm could estimate the source signals from the mixed signals more precisely.

Development of quality function development matrix to measure the quality management performance of contractor

Quality function development (QFD) matrix was introduced as a tool to measure the quality management performance of contractors. Engineering quality, quality management system components, and their relationship were defined. An integrated engineering quality system was decomposed into seven factors and the quality management system was composed of eight factors. Importance weights of all factors and their relationship point were acquired by questionnaires and interviews. Then, QFD matrix was formulated and the calculating process was proposed. This model was verified on a case study. The result shows that it is useful for contractor in benchmarking themselves and invaluable for owners in the process of deciding contractor.

Influence of explosive density on small scale internal blast experiments

To study the internal blast load, a lot of small scale internal blast experiments have been conducted. For those experiments, the influence of explosive density generally was not taken into account while it was simple to have slight density differences in application. To analyze the influence of explosive density on small scale internal blast experiments, the finite element code LS-DYNA was employed and the numerical model was established. The numerical model was validated against published experimental data and the result shows a good agreement. We found that that both the peak overpressure and impulse increase with the density of charge. Empirical equations were fitted using the calculation results to evaluate the influence of explosive density on the peak overpressures and impulses.

Hydroxylation-induced half-metallicity in graphitic ZnO sheet

The structural, electronic and magnetic properties of the hydroxylated graphitic Zinc oxide (ZnO) sheet were studied using the density functional theory. We found that the hydroxylation can induce a magnetic moment of 1.0 μB per unit cell and turn graphitic ZnO sheet from semiconductor into half metal for the three studied hydroxylated configurations with a half-metal gap up to 0.60 eV. The relative stability of each situation was also discussed and the structure for hydroxyl absorbed above the hexagonal ring of ZnO sheet was the most steady. The prominent electronic and magnetic properties may endow 2D ZnO sheet great opportunity in future spintronics.

Review on Chern＇s article Chinese students＇ word-solving strategies in reading in English

In this essay, the author has endeavored to present a detailed review on Chern＇s article Chinese students＇ word-solving strategies in reading in English from the aspects of research methods, findings and arguments. We generally agree on the results she drew, which were as follows： （1） Chinese EFL learners were similar to learners from other L I language backgrounds in strategies use in reading; （2） Both high proficient learners and low proficient learners made more use of sentence-bound strategies and backward cues; （3） The use of forward cues differentiated the good learners from the poor learners; （4） The use of global cues correlated with subjects＇ proficiency level. However, there are some deficiencies as well. Chern over-emphasized the importance of guessing in reading, forbidding the use of dictionary or skipping. Therefore, she could not show the readers a full picture of how Chinese EFL learners discover meanings of unknown words in reading. Thus the author proposes that a further research should be conducted to see if other strategies will be employed in a real-life reading.

“文章原型阅读”单元样章(下)

由上海教育出版社组织编写的国家新课程标准高中语文课本（试编本），经过近两年的艰苦工作，已接近尾声。从2006年第5期期开始，本刊陆续刊登该课本的试编样章，目的是促进我国的语文教材建设。我们欢迎各界人士提出批评，尤其期盼高中语文教师提供实地试教的反馈意见和建议。