DZ125合金HY3包覆型涂层退除研究

目的 研究化学法退除DZ125合金HY3包覆型涂层。方法 采用真空电弧镀技术（AIP）在定向凝固镍基高温合金DZ125上制备包覆型涂层HY3,利用化学方法完全退除基体上的涂层,通过失重法研究对比1#和2#退除溶液退除HY3涂层和DZ125合金的退除速率,采用扫描电镜（SEM）对退除后的HY3涂层和DZ125基体的微观组织进行观察。结果 经过100 min,2#溶液可以将20 ?m左右的HY3涂层完全退除,采用1#溶液需要超过100 min才能完全退除涂层。两种对DZ125合金的腐蚀性很小,对于同一种合金而言,1#溶液和2#溶液对合金的腐蚀速率比值为1︰13。在1#溶液中,合金与涂层腐蚀速率的比值为1︰87.65;在2#退除溶液中,合金与涂层腐蚀速率的比值为1︰6.81。结论 1#溶液更加适合退除DZ125合金上的HY3涂层。     

Induction of cytochrome P4501A and endocrine disrupting effects of school incinerator residues

The emission of the dioxin-like compounds from on-site waste incinerators of seven schools in Kyonggi Province of Korea was evaluated by determination of the cytochrome P4501A(CYP1A) catalytic activity and antiestrogenic activity using cell culturemicrobioassay. The residue samples were extracted in a Soxhlet apparatus using toluene for 20 hr. The concentrated crude extractswere fractionated with a basic alumina column. Dioxin-like compounds were then extracted. Induction of CYP1A activity in a rat(H4IIE) hepatoma cell line was used as indicator of biologicaleffect of incinerator residues and measured as 7-ethoxyresorufin-O-deethylase(EROD) activities. The EROD activities of fraction II extracts (one of the two extracts) in the H4IIE cells were from 0.044±0.002 to 4.424±0.351 ng-TEQ g^-1 (TCDD Toxicity equivalent), showing relatively high inducing capacity. Antisetrogenicity of the extracts was measured as decrease in E₂-induced cell proliferation. Most of the extracts showed antiestrogenic activity in MCF7-BUS cell.The TEQ levels of the incinerator residues and the antiestrogenicactivities were in good correlation, strongly suggesting that thepotent toxic emissions were indeed produced from the on-site school waste semi-incinerators and could cause the antiestrogenicity.     

工作场所空气中硫酸雾（SO3）的分析

采用碘量法测定工作场所空气中的三氧化硫及硫酸雾，三氧化硫及硫酸雾经中性水吸收后与碘化钾和碘酸钾反应，析出的碘与淀粉指示剂作用产生蓝色，进行比色测定。     

HPLC法测定饲料中维生素A、维生素D 3 和维生素E

建立了以w(C2H5OH)=95 %乙醇直接提取,高效液相色谱仪在波长280 nm和254 nm处连续测定饲料中维生素A、维生素D3和维生素E的方法.色谱柱为大连依利特Hypersil ODS C18(25 cm×4.6 mm×5 μm),流动相为甲醇-水,流速为1.2 mL/min.维生素A、维生素D3、维生素E的质量浓度分别在1.0 mg/L～20.0 mg/L、0.5 mg/L～15.0 mg/L 、2.5 mg/L～50.0 mg/L范围内与峰面积呈良好的线性关系,检测限分别为0.3×10-6 μg、0.04×10-6 μg、5.0×10-6 μg,相对标准偏差分别为1.6 %、2.7 %、2.4 %,平均回收率分别为99 %、102 %、98 %.     

助催化无汞盐快速测定水中化学需氧量

在ψ（Ｈ２ＳＯ４）＝５６％硫酸介质，重铬酸钾的氧化体系中，以钼权铵，硫酸铝钾为助催化剂，可减少量化剂硫酸银的用量，消解１５ｍｉｎ即可测定水中化学需氧量，用硝酸银溶液代替硫酸汞去除水氯离子，避免了汞盐的污染，工业废水回收率在９７％～１０１％之间，有较好的准确度。     

Controlled-release fertilizer(CRF):A green fertilizer for controlling non-point contamination in agriculture

Fertilizers contribute greatly to high yields but also result in environmental non-point contamination, including the emission of greenhouse gas(N2O) and eutrophication of water bodies. How to solve this problem has become a serious challenge, especially for China as its high ecological pressure. Controlled-release fertilizer(CRF) has been developed to minimize the contamination while keeping high yield and has become a green fertilizer for agriculture. Several CRFs made with special coating technology were used for testing the fertilizer effects in yield and environment through pot experiment and field trial. The result indicated that the CRFs had higher N use efficiency, thus reducing N loss through leaching and volatilization while keeping higher yields. Comparing with imported standard CRFs,the test on CRFs showed similar fertilizer effect but with much lower cost. CRFs application is becoming a new approach for minimizing non-point contamination in agriculture.     

三维虚拟地理环境构建与应用

可量测三维虚拟地理环境是数字地球应用的基础平台。本文研究了三维虚拟地理环境构建空间几何建模与纹理建模关键技术。提出了一种适用于大规模生产建库的可量测三维虚拟地理环境构建的生产工艺模型和三维虚拟模型数据获取的方法。介绍了三维虚拟地理环境在城市规划、房产经营管理等方面的应用。     

分光光度法测定雨水中微量过氧化氢的研究

本文提出了以钛（ＩＶ） 过氧化氢 ２ （３，５ 二溴 ２ 吡啶偶氮） ５ 二乙氨基苯酚（３，５ ｄｉＢｒ ＰＡＤＡＰ）三元配合物体系光度测定雨水中微量过氧化氢的方法，该方法简便，灵敏度和选择性较高，所得结果令人满意     

CCl4体外引发自由基反应的简易实验方法

通过对不同剂量CCl4与小鼠肝匀浆温育反应液中丙二醛(MDA)含量的测定,确立了CCl4体外引发自由基反应的简易实验方法,并对实验方法进行了考核评定.同时以Hg2 对CCl4体外引发小鼠肝匀浆自由基反应的影响为应用实例进行了研究,结果表明,Hg2 与CCl4的毒性有协同作用.     

Optimization of C/N ratio for preparation of protein-rich and multi-enzymes feed thallus through synergic fermentation of mixed distillers'grains

A new procedure of determining optimal C/N (the rate of carbon source to nitrogen source) of mixed distillers' grains for combined bacteria synergic fermentation is established. At the same time an improved method evaluating bacteria growth, called method of dry cell weighing by filtering is developed. For each combination of C and N , their initial and residual contents before and after fermentation respectively are determined. Then followed the calculation of utilization of C and N sources by the compound bacteria. The optimal C/N is finally located from among the utilization of C and N of several combinations and the weight of produced mass of oven-dried thallus The conditions of fermentation are: inoculum size 10%, temperature 30.0℃, rotational speed 170 r/min, shake culture time 48h. The best results obtained from orthogonal experiments are: maximum mass of oven dried thallus is 14.693g in a liter liquid medium, maximum utilization rate of carbon source is 98.13% and maximum utilization rate of nitrogen is 78.14%. Optimal C/N is 5.1.