不同热处理脱脂乳粉对褐色乳酸菌饮料稳定性的影响

比较了不同热处理脱脂乳粉的理化性质,并将其应用于褐色乳酸菌饮料生产,以鲜制脱脂乳为对照,探讨了不同脱脂乳原料以及褐色乳酸菌饮料生产工艺对饮料稳定性的影响。结果表明:不同热处理脱脂乳粉的蛋白质、脂肪、水分含量以及乳酸度均无显著差异(P>0.05);但其乳化性、起泡性及乳清蛋白氮指数存在显著差异(P<0.05),随着乳粉受热程度增加,其乳化性、起泡性及稳定性下降。在饮料生产过程中,使用中温脱脂乳粉更有利于保持饮料的稳定性,而以高温、低温乳粉以及鲜制脱脂乳为原料的饮料稳定性欠佳;高温褐变使脱脂乳粒径、离心沉淀率增大,zeta电位降低,产品稳定性下降;均质处理及配料定容后稳定性提高。研究旨在为褐色乳酸菌饮料生产中有效地提高产品的稳定性提供技术参考。     

师专类数学教育--关于《离散数学》教学设置与安排

开设离散数学课程的必要性，课时分配以及在此过程中的教学设计和安排，贯穿启发性原则。     

A Condition States Assessment System for Concrete Bridges Using Neural Networks

Due to continuing aging and heavy utilization of many bridges and the limited available funds, the of proper bridge condition state assessment has risen recently, which is the crucial point for rational decision-making on MR＆R activities. This paper presents a prototype of the concrete bridge condition state assessment system （CBCSAS） with the following sub-modules： inspection, parameter recognition, structural assessment, main cause identification and priority-to-action. And multi-layer neural networks, which may combine with fuzzy set theory or not, are performed to realize the structural assessment with embedding expert knowledge into the assessment system.     

一种电动汽车锂离子动力电池组一致性评估及维护方法

锂离子动力电池组一致性好坏直接影响着电动汽车使用效率。为了方便动力电池组的使用及维护,需采取一定的方法对电池组一致性进行监控。该文提出一种基于单体电池电压值标准偏差的锂离子动力电池组一致性评估方法,并将电池组一致性分为四个阶段,根据不同阶段采用不同的维护策略。实验通过对电动汽车锂离子动力电池组进行充放电测试,采用文中提出的方法获得了四个阶段的电池组一致性评估曲线,为电动汽车电池使用及维护提供指导。     

Minimizing the effect of near-distance dielectric sensitivity on retrieving average aspect ratio of gold nanorod by optical extinction spectroscopy: in the case of CTAB adsorption

The aspect ratio （AR） is one of the most intriguing parameters of gold nanorods （GNRs）, which plays an important role in determining localized surface plasmon （LSPR） properties. Instead of conventional imaging techniques, the optical extinction spectroscopy （OES） method has been developed for allowing fast sta-tistically measuring the average AR under static approxi- mation. In this work, combining with the previous achievements in spectroscopic technique, we further ana-lyze the effects of gold dielectric function and near dis-tance dielectric sensitivity. The former may reflect possible dielectric loss of real Au samples from ideal single crys- talline. The latter reflects the cetyltrimethylammonium bromide （CTAB） adsorption on the surface of GNR indu- ces different LSPR shifts below and above critical micelle concentration （CMC）. However, their effect on the deter-mination of AR has not been evaluated in OES method. The average AR measurements as a function of absorbance of CTAB-GNRs and LSPR maximum below the CMC were studied. Our results indicate that after considering these factors, the mean ARs obtained from spectroscopic techniques are closer to those obtained from imaging techniques.     

Prediction of protein structural classes using the theory of increment of diversity and support vector machine

Based on the concept of the pseudo amino acid composition(PseAAC),protein structural classes are predicted by using an approach of increment of diversity combined with support vector machine(ID-SVM),in which the dipeptide amino acid composition of proteins is used as the source of diversity.Jackknife test shows that total prediction accuracy is 96.6% and higher than that given by other approaches.Besides,the specificity(Sp) and the Matthew’s correlation coefficient(MCC) are also calculated for each protein structural class,the Sp is more than 88%,the MCC is higher than 92%,and the higher MCC and Sp imply that it is credible to use ID-SVM model predicting protein structural class.The results indicate that:① the choice of the source of diversity is reasonable,② the predictive performance of ID-SVM is excellent,and ③ the amino acid sequences of proteins contain information of protein structural classes.     

一种发展多媒体通信业务的实用方法

简要地阐述了发展多媒体通信的必要性，提出了走联合之路是发展多媒体通信业务的实用方法，并对联合发展中的几个关系进行了详细的讨论。     

一株产纤维素酶细菌的分离鉴定及其酶学特性研究

 采用CMC平板筛选和刚果红染色等方法,从湖南科技大学校园腐烂木芙蓉根部土壤中分离1株产纤维素酶菌株CXB001,经生理生化测试、16S rDNA分子进化树分析,鉴定菌株为Bacillus velezensis。对该菌株的生物特性研究表明,其最适生长温度为37 ℃,在10~50 ℃,pH 5.0 ~11.0中能生长,在pH 6.0~9.0,34~40 ℃,1.5% ~3.5% NaCl 的培养条件下,最适产酶。CXB001所产纤维素酶最适反应温度为50 ℃,最适反应pH为5.0;在20 ℃、pH 5.0~ 7.0具有较好的稳定性。Co ²⁺对纤维素酶具有激活作用,Mg²⁺,Fe²⁺对纤维素酶具有抑制作用。     

改进的新灰色模型在边坡变形预测中的运用

通过对边坡表面变形观测系统反馈信息特性的充分认识,采用灰色理论,沿用新陈代谢思想,从优化原理出发,进行逐层推导,得到了具有一定针对性的MAMUGM（1,1,w,η）预测模型,并在工程实例中进行验证,结果表明该模型具有一定模拟和预测精度,对变形非渐变点具有优越的处理能力,通过设置误差限,利用残差控制和样本重构两方面的优化选择,可以使模型能够进一步得到改进,为评估浅表层坡体的稳定提供了依据,具有一定的适用性.     

大束流Co离子注入形成CoSi_2/Si Schottky结的特性

采用 Schottky结源漏结构是克服传统 MOSFET器件短沟效应的一种有效方法。不同于常规的固相反应形成硅化物的方法 ,该文利用金属蒸汽真空弧 (MEVVA)离子源进行强流金属离子注入合成了金属硅化物 Co Si2 ,并首次对其与 Si所形成的 Schottky结特性进行了研究。结果表明85 0℃退火 1m in后已形成 Co Si2 硅化物晶相 ,且结深易于控制。电流特性表明 p型衬底得到了较好的 Schottky结 ,势垒高度为 0 .4 8e V,理想因子为 1.0 9,而 n型衬底形成的Schottky结的理想因子偏大 ,需进一步改进工艺