Application of ACO algorithm in protein structure prediction

The hydrophobic-polar (HP) lattice model is an important simplified model for studying protein folding. In this paper, we present an improved ACO algorithm for the protein structure prediction. In the algorithm, the "lone"ethod is applied to deal with the infeasible structures, and the "oint mutation and reconstruction"ethod is applied in local search phase. The empirical results show that the presented method is feasible and effective to solve the problem of protein structure prediction, and notable improvements in CPU time are obtained.     

Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2

The diversities of hydrogen sorption properties of Mg₂FeH₆-based complexes with and without TiO₂ were investigated. Mg₂FeH₆-based complexes with and without TiO₂ were synthesized respectively by reactive mechanical alloying, and hydrogen sorption properties of the complexes were examined by Sieverts-type apparatus. The results show that the sample without TiO₂ releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H₂ pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H₂ pressure. But for the sample with TiO₂ addition under the same condition, it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO₂ are determined to be 71.2 and 80.3 kJ/(mol·K), respectively. The improvement in hydrogen sorption rate and and reduction in activation energy can be attributed to the addition of TiO₂.     

Corrosion resistance of cerium conversion film electrodeposited on Mg-Gd-Y-Zr magnesium alloy

The cerium conversion film was applied to improving the corrosion resistance of Mg-Gd-Y-Zr magnesium alloy. The film was electrodeposited on the surface of the Mg-RE alloy in cerium nitrate solution. The compositions and morphologies were analyzed by X-ray diffraction(XRD), scanning election microscopy (SEM). The corrosion behaviors of the film were investigated electrochemical impedance spectroscopy (EIS), potentiodynamic polarization tests and immersion tests. The results show that the optimum parameters for electrochemical deposition are as follows: pH 10.0, time 30 min, 50 mmol/L Na₂CO₃ and temperature 25 °C by the designed experiments according to the orthogonal table L(9, 3⁴). The corrosion protection efficiency is dependent on the deposition parameters. The cerium conversion film shows better corrosion protection behavior than chromate conversion film on Mg-Gd-Y-Zr magnesium alloy. Foundation item: Project (5133001E) supported by the Major State Basic Research and Development Program of China     

Zn掺杂对GdMnO体系的晶体结构影响

系统研究了Gd（1-x）ZnxMnO3（x=0,0.2,0.4,0.6,0.8,1.0）体系的结构。结果表明,实验样品具有正交对称性结构。当Zn掺杂浓度x≤0.4时,随着Zn掺杂浓度的增加,晶格常数b、c减小,而晶格常数a增大,晶胞体积逐渐减小;当掺杂浓度x≥0.6时,Zn掺杂浓度的增加,晶格常数b、c增大,而晶格常数a减小,晶胞体积逐渐增大。计算表明Gd（1-x）ZnxMnO3系列化合物的容忍因子在0.76~0.92范围,可以形成稳定的钙钛矿结构。     

Prevention of rockburst by guide holes based on numerical simulations

We studied variations in the stress field around guide holes drilled during tunnel excavation to understand the mechanical mechanism by which these holes help prevent rockburst. The study used elasto-plastic analysis of a circular chamber under non-axisymmetrical loads. The results showed that the unloading of in-situ stresses, and the forming of a secondary stress field, leads to a severe change in the stress field around the guide holes. This causes the formation of an X-shaped area of plastic deformation, which prevents the rockburst. Adopting a sub-model finite dement technique, we analyzed the factors that influence the distribution of the plastic area, such as the guide hole distribution and the in-situ stress state. The calculations showed that higher initial stresses result in greater adjustment to the stress field. When the stress concentration is greater the size of the plastic area surrounding the guide hole is larger. A multi-row distribution of the guide holes shaped like a quincunX can increase the interconnectivity of the plastic areas and allow the plastic area to extend from the tunnel wall deep into the surrounding rock. An optimized design was put forward based on the distribution of the plastic area around guide holes and the factors that influence it.     

基于吸收和吸附的油气回收集成工艺

设计2个油气吸附回收实验来比较活性炭吸附油气的效果。该吸附塔进口油气体积分数分别为0．05,0．40,进口混合气流量分别为40,65m^3／h。实验结果表明,二者回收率高达95％以上,但实验Ⅰ热效应明显比实验Ⅱ低,两者炭床温升分别为43．1℃和72．2℃。为此开发出吸收吸附集成回收工艺,其回收率可达到99．6％,尾气油气体积分数可控制在0．0032以下,而且吸附塔热效应小,炭床温升小于35℃。该集成系统投资比单纯的吸收法低,安全性比单纯的吸附法高,综合效益显著。     

刘瓛易学与宋齐之际易学的转型

南朝刘宋时期,郑玄易学被官方舍弃,影响力衰微。而到南齐时,郑玄易学却出现复苏的迹象,这有赖于南齐官方的扶植,同时也与刘碱对郑玄易学的传播有关。刘撇易学体现了比较明显的宗郑的风格,所谓的“刘瓛承马、郑”的真实含义在于其易学中注重对郑玄易学中注重义理的解经体例的传承。这体现南朝时期学者对待郑玄易学的态度。刘瓛的出现对于郑玄易学在南朝的传承极有意义     

改进星形图和超维树在健康信息系统中的应用

信息可视化主要应用于没有几何属性的抽象信息,揭示信息之间的关系和信息中隐藏的特征.介绍了几种典型的多维数据的信息可视化和交互方法,提出了用星形图技术和超维树技术对人体健康多维数据进行可视化的设计方法,给出了可视化结果.研究成果可以应用到环境,医学,体育和游戏等多个领域.     

立卧两用电动轮椅车的设计

在研究坐姿对身体产生的不利影响的基础上,突破传统轮椅的功能和结构,提出了一种可实现站立及仰卧姿态的电动轮椅车的设计方案,阐明了轮椅机构的工作原理,并对站立机构进行了运动分析．在UG／Motion Simulation模块中建立了轮椅虚拟样机,并进行了运动仿真,结果验证了轮椅机构的合理性．     

焊接方法优化设计系统的研究

在分析专家系统应用于焊接领域的基础上,根据焊接工艺设计的原理及通常焊接方法的选择原则,研究了焊接工艺设计的特点,提出了系统的设计思想,确定了系统总体框架及模块功能,利用VB实现了建立焊接方法优化设计的系统．采用本系统可以提高焊接工艺人员编制WPS的效率,为生产企业节省资金、缩短技术准备周期,解脱技术人员的繁重劳动,采用该焊接方法优化设计系统还可以增强企业的竞争力．