工业酚水稀释的RBF神经网络预测控制

针对酚水稀释过程中酚水流量不便测量的工程情况,提出了一种基于RBF（径向基）神经网络的预测控制方法.在酚水罐每个液位变化周期内使用计算机定时测量液位高度,并将这些高度值作为目标输出,在每个循环结束时训练RBF网络,利用RBF网络的逼近能力来实时预测酚水流量,从而控制清水的配比,实现酚水质量浓度的稳定.该方法可避免测量误差带来的干扰,提高控制精度.     

高等教育的公益性与高校学报的对应关系

高校学报是高等教育体系的有机组成部分,对高校学报的考察和定位不可脱离这一关系。高校学报的使命与高等教育的使命紧密相连,其基本属性与高等教育的基本属性是一致的。高校学报是公益性的出版单位,其出版的学报属于准公共产品。在出版业改革中,作为公益性出版的高校学报与所在学校的隶属关系无需改变。撇开与大学的整体关系,以刊论刊,孤立地将学报与营利性期刊等同对待是片面的。     

基于Moodle的计算机网络课程教学平台的构建与应用

随着多媒体和网络技术的广泛普及与应用,网络教学与课堂教学有机结合正在成为高校一种新的教学模式.文章论述了课堂教学与网络教学相结合的必要性,介绍了Moodle平台的特点和功能,构建了基于Moodle的计算机网络课程教学平台,提出了网络教学平台与课堂教学的整合模型.     

一株微生物采油菌的16S rDNA鉴定和绿色荧光蛋白分子标记

筛选到一株高效生产多糖的YX菌,油田先导试验证明该菌可以用于微生物调剖提高原油采收率（Microbial Enhanced Oil Recovery,MEOR）.经16SrDNA分析鉴定,YX菌属于肠内杆菌属（Enterobacter.）,为跟踪监测其动态信息,构建表达绿色荧光蛋白（green fluorescent protein,GFP）的重组质粒pET-30a（＋）-EGFP,利用CaCl2法将其转化至YX菌,利用荧光显微镜可以观察到重组YX（GFP）工程菌的绿色荧光.结果表明YX菌可以被绿色荧光蛋白基因标记,用于微生物采油研究.     

高富锗蛹拟青霉菌株的筛选

为了获得高富锗能力的蛹拟青霉菌株,对蛹虫草无性型蛹拟青霉不同菌株进行了富锗培养,并对富锗能力、生物量、有机锗转化率等指标进行了测定.结果表明：富锗能力最强的菌株为28号和14号,在锗浓度为500μg/mL时,生物量分别为15.09 mg/mL和13.84 mg/mL,有机锗转化率分别达到2.3%和1.9%.蛹拟青霉不同菌株具有不同的富锗能力.     

重铬酸钾氧化比色法和气相色谱法定量分析发酵液中乙醇的比较研究

为了比较重铬酸钾氧化比色法和气相色谱法测定乙醇体积分数的效果,采用这2种方法分别定量分析已知体积分数的标准液和未知体积分数的发酵液.分析和比较统计结果发现：定量分析发酵液乙醇体积分数时气相色谱法较准确,成本较高;重铬酸钾氧化比色法可以用于发酵液乙醇体积分数的批量分析,成本较低.     

一种基于门限思想的窃听信道网络保密方案

网络编码可使网络通信的容量达到上界,使网络的利用率得到极大的提高.Cai等基于网络编码给出了窃听信道通信网络（CSWN）模型,将信息安全问题引入到网络编码中.文章借鉴密钥共享理论中的门限理念,用密钥共享体制中分配重构主密钥的方式来加密和恢复消息,得到了一个可达到完善保密性要求的可行且高效的编码方法.     

Water abundance of mine floor limestone by simulation experiment

The water abundance of mine floor limestone needs to be solved urgently as the average depth of coal mining in China has increased gradually. A method is presented to discuss water abundance with the numerical and physical layered geoelectrical model being established in the half-space, full-space and full-space with tunnel, respectively. The parameters of water abundance are changed in this study, which includes water quantity, water content and volume of abnormity of water-containing abnormity. Results indicate that the different work fields have different macroscopic influences on the apparent resistivity,and the water abundance parameters of water-containing abnormity have quantitative relationship with the apparent resistivity mean in abnormal regions(three-dimensional space region). The quantitative relationships are shown as following: firstly, the amount of water injection has negative linear correlation with the apparent resistivity mean; secondly, when abnormity is unsaturated, there is a negative power function relationship between water content and apparent resistivity mean; thirdly, the volume of abnormity and apparent resistivity mean behave as a decreasing power function law.     

Vertical load capacities of roof truss cross members

Trusses used for roof support in coal mines are constructed of two grouted bolts installed at opposing forty-five degree angles into the roof and a cross member that ties the angled bolts together. The load on the cross member is vertical, which is transverse to the longitudinal axis, and therefore the cross member is loaded in the weakest direction. Laboratory tests were conducted to determine the vertical load capacity and deflection of three different types of cross members. Single-point load tests, with the load applied in the center of the specimen and double-point load tests, with a span of 2.4 m, were conducted. For the single-point load configuration, the yield of the 25 mm solid bar cross member was nominally 98 kN of vertical load, achieved at 42 cm of deflection. For cable cross members, yield was not achieved even after 45 cm of deflection. Peak vertical loads were about 89 kN for 17 mm cables and67 kN for the 15 mm cables. For the double-point load configurations, the 25 mm solid bar cross members yielded at 150 kN of vertical load and 25 cm of deflection. At 25 cm of deflection individual cable strands started breaking at 133 and 111 kN of vertical load for the 17 and 15 mm cable cross members respectively.     

Priority-sequence of mineral resources' development and utilization based on grey relational analysis method

Generally, the sequence decision of the development and utilization of Chinese mineral resources is based on national and provincial overall plan of the mineral resources. Such plan usually cannot reflect the relative size of the suitability of the development and utilization of mineral resources. To solve the problem, the paper has selected the gift condition, the market condition, the technological condition,socio-economic condition and environmental condition as the starting-points to analyze the influential factors of the priority-sequence of mineral resources' development and utilization. The above 5 conditions are further specified into 9 evaluative indicators to establish an evaluation indicator system. At last,we propose a decision model of the priority sequence based on grey relational analysis method, and figure out the observation objects by the suitability index of development. Finally, the mineral resources of a certain province in China were analyzed as an example. The calculation results indicate that silver(2.0057), coal(1.9955), zinc(1.9442), cement limestone(1.9077), solvent limestone(1.5624) and other minerals in the province are suitable for development and utilization.