调控流图与数据挖掘相结合的复杂过程故障诊断方法研究

采用调控流图与数据挖掘相结合的方法研究了原油蒸馏过程故障诊断问题。利用调控流图方法进行建模,通过对调控流图模型的定性仿真获得每个故障的传播途径及对每个观测变量的影响,形成故障-监测变量关系表,最后利用数据挖掘技术建立从监测变量推断故障的故障诊断模型。由于该模型结构简单,可以在生产过程中直接应用,具有速度快、判断直接的特点,在一定程度上解决了复杂过程实时故障诊断中的组合爆炸问题。     

抗HBsAg单链抗体的等电点测定和结构模拟

应用实验生物学和计算生物学方法对重组人源抗HBsAg单链抗体(HBscFv)的部分理化性质和空间结构进行分析．首先应用蛋白质分析软件包Antheprot预测HBscFv等电点，然后等电聚焦测定HBscFv等电点，在此基础上，用神经网络法预测HBscFv二级结构，然后用同源建模的方法，获得HBscFv三级结构．结果发现，HBscFv等电点理论值为8．51，实验值为7．3～8．1；PHDsec结果表明，HBscFv是一种全β蛋白质；三级结构建模表明，HBscFv的VH结构域由9个片层组成，VL结构域由8个片层组成；由于单链抗体的特殊性，三级结构建模无法给出VH与VL结构域之间进一步折叠后形成的结构。     

耦合连续BVP振子中的分支现象

对有阻尼的耦合的连续BVP振子,利用平衡点理论和分支定理,分析系统平衡点的存在和稳定性以及存在的分支现象,通过matlab程序对振子数值模拟,给出图像并验证理论结果.     

测定蛋白质与胆酸盐结合量的方法

介绍一种应用高效液相色谱仪连接示差折射率检测仪测定牛血清白蛋白与脱氧胆酸钠的结合量的简便方法．该法通过凝胶过滤实现脱氧胆酸与蛋白质的结合平衡和脱氧胆酸的分离，根据示差折射率检测仪的读数定量脱氧胆酸钠．应用该法精确测定脱氧胆酸钠与牛血清蛋白结合等温线与已报道的采用其他方法测定的结合等温线相似     

Movement and segregation of kinetochores experimentally detached from mammalian chromosomes

The kinetochore is a specialized structure at the centromere of eukaryotic chromosomes that attaches chromosomes to the mitotic spindle. Recently, several lines of evidence have suggested that kinetochores may have more than a passive role in the movement of chromosomes during mitosis and meiosis. Kinetochores seem to attract and 'capture' microtubules that grow from the spindle poles and microtubules may lengthen or shorten by the addition or subtraction of tubulin subunits at their kinetochore-associated ends. An attractive hypothesis is that kinetochores function as 'self-contained engines running on a microtubule track'. Here, we show that kinetochores can be experimentally detached from chromosomes when caffeine is applied to Chinese hamster ovary cells that are arrested in the G1/S phase of the cell cycle. The detached kinetochore fragments can still interact with spindle microtubules and complete all the mitotic movements in the absence of other chromosomal components. As these cells enter mitosis before DNA synthesis is completed, chromosome replication need not be a prerequisite for the pairing, alignment and segregation of kinetochores.     

大学生人文教育的认识与实践

弘扬人文精神,强化人文教育,提高大学生人文素质是社会主义精神文明建设和发展社会主义先进文化的需要;是培养新世纪高质量人才的需要;是新时期建立健全完整的价值观体系的需要。考察和分析中国大学人文教育的现状,可以看出强化人文教育的现实必要性和迫切性。其途径主要有:贯穿以人为本的发展主线;改革教学内容和课程体系;提高教师的人文素质;积极营造良好的校园文化氛围;注重学生的社会实践。     

Effectiveness of sodium silicate as gangue depressants in iron ore slimes flotation

The recovery of iron from the screw classifier overflow slimes by direct flotation was studied. The relative effectiveness of sodium silicates with different silica-to-soda mole ratios as depressants for silica and silicate bearing minerals was investigated. Silica-to-soda mole ratio and silicate dosage were found to have significant effect on the separation efficiency. The results show that an increase of Fe content in the concentrate is observed with concomitant reduction in SiO₂ and Al₂O₃ levels when a particular type of sodium silicate at a proper dosage is used. The concentrate of 58.89wt% Fe, 4.68wt% SiO₂, and 5.28wt% Al₂O₃ with the weight recovery of 38.74% and the metal recovery of 41.13% can be obtained from the iron ore slimes with 54.44wt% Fe, 6.72wt% SiO₂, and 6.80wt% Al₂O₃, when Na₂SiO₃ with a silica-to-soda mole ratio of 2.19 is used as a depressant at a feed rate of 0.2 kg/t.     

宜昌市城区PM_(2.5)污染形成灰霾天气的规律研究

2012年选取与气象站点相邻的一个环境空气质量测点对PM2.5进行了研究性监测,测点距地面23m,全年PM2.5质量浓度在19~284μg/m3之间,年均质量浓度为89μg/m3,月均质量浓度最高的为1月.系统分析全年PM2.5监测质量浓度与相邻气象测点灰霾、能见度观测数据之间的关系,得到以下结论:宜昌市城区PM2.5污染质量浓度与灰霾观测值相关性不强,但与能见度的观测值显著相关;全年能见度降低受PM2.5污染的影响具有季节性,2、5~6三个月与7~9三个月及4、10~11三个月,这3组月份内的PM2.5与能见度之间的回归曲线基本一致,全年中3月份影响最大,而1月份最小,主要与气温、风速、降雨因素有关.     

硅基半导体中埋置硅量子点的低温生长与发光研究

在硅基半导体中埋置的硅量子点因量子限域效应而具有光致发光的性能,是一种实现硅基光电集成很有前途的材料.文章介绍了此类复合薄膜的可控生长,并对其发光进行了研究.     

紫苏微量元素的测定

利用火焰原子吸收涨研究了紫苏根、茎、叶中８种微量元素的含量,并通过实验拟定了各待测元素的最佳分析条件,呼元素的回收率在９６－１０５％之间,相对偏差小于６％,方法快速、准确、实用性强、同时,对紫苏的药理作用进行了探讨,为办的开发提供实验依据。