Using factor analysis scales of generalized amino acid information for prediction and characteristic analysis of β-turns in proteins based on a support vector machine model

This paper offers a new combined approach to predict and characterize β-turns in proteins.The approach includes two key steps,i.e.,how to represent the features of β-turns and how to develop a predictor.The first step is to use factor analysis scales of generalized amino acid information(FASGAI),involving hydrophobicity,alpha and turn propensities,bulky properties,compositional characteristics,local flexibility and electronic properties,to represent the features of β-turns in proteins.The second step is to ...     

Amplified spontaneous emission and power amplification in high-power DF laser systems

Amplified spontaneous emission （ASE） always occurs in high-power DF laser systems with master oscillator-power amplifier （MOPA） configuration. ASE not only reduces the energy extraction efficiency of the laser system, but also negatively influences its heat management. The interaction between the ASE flux and the coherent laser flux, as well as the effect of ASE on cuboid DF amplifiers, is studied using a finite difference method and an iterative arithmetic. In addition, the influence of ASE on coherent laser amplification is discussed in detail.     

The effect of the Kerr nonlinearity on the transmission through the nanoslit gold film

This paper has made a theoretical study of enhanced transmission through a gold grating with arrays of subwavelength slits filled with nonlinear Kerr medium. The results of the research are based on rigorous finite-difference time domain calculations. The resonance transmission peaks in the investigated wavelength range are produced as a result of the surface plasmon resonance collaborated with the localized waveguide resonance. The paper also gives a detailed analysis of the influence exerted by various fa...     

THE BOREL DIRECTIONS OF ALGEBROIDAL FUNCTION AND ITS COEFFICIENT FUNCTIONS

In this article, the relationship between the Borel direction of algebroidal function and its coefficient functions is studied for the first time. To begin with, several theorems of algebroidal functions in unit disk are proved. By these theorems, some interesting conclusions are obtained.     

Preparation of Composite Charge-mosaic Hollow Fiber Membrane by Interfacial Polymerization

The preparation of composite charge-mosaic membrane included spinning of hollow fiber as the supporting membrane, preparing a selective layer on the inside surface of the fiber by interracial polymerization. The charge-mosaic membranes show a high salt permeability while retaining sucrose. The charge-mosaic membrane can be effectively used to separate multivalent salts with organic matter of molecular weight great than 300g/mol in industry.     

A STUDY ON THE ADSORPTION OF LOW CONCENTRATION FREE ALKALI BY SUBACID RESIN

1. INTRODUCTIONIn the purification process of food, drug, and biological products, usually the material to be purified were not neutral. Application of traditional neutralization method with acid or alkali could increase electrolyte content in the material to be purified. Due to the capability of the adsorption of free alkali by subacid resin, the defect of electrolyte absorption in neutralization could be avoided when used in the purification of food, drug, and biological products [1]. H…     

ICP-AES法对茶叶捕集水溶液中镉(Ⅱ)、铅(Ⅱ)行为的研究

用ICPAES法研究了绿茶和红茶对水溶液中镉(Ⅱ)、铅(Ⅱ)的捕集行为,考察了时间、pH、温度等因素的影响。结果表明,绿茶对水中镉(Ⅱ)、铅(Ⅱ)的捕集30min基本达到平衡,而红茶的捕集平衡时间约为60min。当pH<4时捕集率随pH值减小而显著降低,当pH>4时捕集率变化趋缓;当pH<6时茶样对铅(Ⅱ)的捕集率大于镉(Ⅱ),而当pH>6之后则正相反,这与不同酸度的溶液中茶叶的带电状态及镉(Ⅱ)、铅(Ⅱ)的形态分布有关。升高温度有利于绿茶对镉(Ⅱ)、铅(Ⅱ)的捕集,而红茶变化不大;捕集后的镉(Ⅱ)、铅(Ⅱ)在25℃下用水洗脱困难,其中绿茶与铅(Ⅱ)的相互作用较强。     

Mn基钙钛矿氧化物中的自旋极化隧道输运

借助自旋极化隧道模型，对具有不同居里温度的Mn基钙铁矿氧化物的电阻率随温度和磁场的变化行为进行了计算。结果表明，模型给出的结果和献上普遍报道的实验结果在行为上有非常好的一致性，表明这类材料中所观察到的电子输运和磁性质可以基于这一模型而得以理解。     

ICP-AES法测定酸枣仁汤中多种金属元素

为了探讨中药方剂酸枣仁汤中多种金属元素的测定方法,采用湿法HNO3-H2O2对试样进行消解,用电感耦合等离子体原子发射光谱(ICP-AES)法同时测定酸枣仁汤的中药方剂(酸枣仁、茯苓、甘草、知母、川芎)中钙、铬、铝、铁、钾、镁、锰、锌等元素的含量,各元素回收率在95．5％～106．8％之间,变异系数为1．7％～3．9％。应用本方法测定实际样品,结果令人满意。     

A first-principle study of the structural and electronic properties of amorphous Cu-Zr alloys

The atomic and electronic structures of amorphous CuxZr100-x(x=36,46,50,56,64) alloys were simulated using first-principle calculations within a 400-atom supercell.The pair correlation function,coordination numbers,local cluster structures and electronic density of states were analyzed.Reasonable agreements between the theory and the experiments were obtained.The amorphous alloys exhibit different local cluster structures and can all be explained with cluster formulas [cluster](glue)1,3,where the clusters a...