慢回弹聚氨酯发泡体吸声性能研究

对不同泡孔大小、不同厚度慢回弹聚氨酯材料在不同频段下的吸声性能进行实验研究.研究表明,1 300 μm是材料泡孔大小对吸声性能影响的转折点.对于低频声波,泡孔直径为1 300 μm时,吸声性能最好;对中高频声波,吸声效果最差.材料厚度对吸声性能的影响,6 cm为最优值,此时材料的吸声效果最好;材料对不同频段声波的吸收效果也各不相同,频率为1 000 Hz声波的吸收效果最差,此频率是材料吸声性能的低谷.以上研究结果为工程使用提供了有价值的实验依据.     

放线菌生物活性物质的高通量筛选

 放线菌是产生生物活性物质最多的一类微生物.最近3年,我室从云南省采集土样,分离到3000多株放线菌、真菌,选择其中2600株,进行发酵,制备成提取物,利用自建的抗氧化、抑制乙酰胆碱酶、抑制一氧化氮合成酶、AGE等模型和高通量筛选系统进行了筛选,筛选到一些值得进一步研究的菌株.对高通量筛选的有关问题及初步筛选结果进行了讨论.     

Discovery of a Miaohe-type Biota from the Neoproterozoic Doushantuo Formation in Jiangkou County, Guizhou Province, China

A megascopic algal fossil assemblage was first discovered by Ma Guogan and Chen Meng‘e in the black shales of the Neoproterozoic Doushantuo Formation in Miaohe Town, Zigui County, Hubei Province in 1978. Formal naming of the Miaohe Biota was proposed by Cheng Meng‘e and Xiao Zongzheng in 199112j, and eleven morphological genera have been previously described. including megascopic algae and putative metazoans .Ding et al. greatly expanded the scope of the Miaohe Biota to 9 phyla consisting of 140 genera, including microphytoplanctons, megascopic algae, metazoans, spongesand trace fossils. Xiao et al. further restudied this fossil assemblage, concluding that only about 18 distinct taxa could be recognized and that many Miaohe taxa are poorly defined or svnonvmous.     

Leaching Mechanism of Complicated Antimony-Lead Concentrate and Sulfur Formation in Slurry Electrolysis

Anodic reaction mechanism of complicated antimony-lead concentrate in slurry electrolysis was investigated by the anodic polarization curves determined under various conditions. The main reactions on the anode are the oxidations of FeCln^(2-n) . Though the oxidation of jamesonite particle on the anode can occur during the whole process, it is less. With the help of mineralogy studies and relevant tests, the leaching reaction mechanism of jameson[to and gudmundite during slurry electrolysis was ascertained. Because of the oxidation reaction of FeCl3 produced by antimony-lead concentrate itself, the non-oxidation complex acid dissolution of jameson[re, the oxidation complex acid dissolution of gudmundite, and the oxidation of air carried by stirring, the leaching ratio of antimony reaches about 35% when HCl-NH4Cl solution is used to leach antimony-lead concentrate directly. So when the theoretical electric quantity is given to oxidation of antimony in slurry electrolysis, all of antimony, lead and iron containing in antimony-lead concentrate, are leached. The formation of sulfur is through the directly redox reaction of Fe^3 and jameson[re. The S^2- in jamesonite is oxidized into S^0 , and forms the crystals of sulfur again on the spot. The redox reaction of Fe^3 and H2S formed by non-oxidative acid dissolution of jamesonite is less.     

Improving the Characteristic of the LaFeO_3 Alcohol Gas Sensor by Using Doping and Surface-Decorating Technique

采用掺杂和表面修饰技术制备ＬａＦｅＯ３乙醇气体传感器，明显地改善了传感器的特性．元件的灵敏度β≥１０（当乙醇气体浓度为２００×１０－６时），乙醇气体和汽油的分离度α为１４．３，在整个相对湿度变化范围内，元件阻值的相对变化在４％～６％之间，元件不通电存放７ｄ，其初期恢复时间为７０ｓ，不通电贮存２７０ｄ，其初期稳定时间小于３ｄ，在使用环境中连续工作９０ｄ其阻值相对变化率小于５％．     

当代哲学思潮、哲学危机与地理学

当代哲学思潮，是20世纪初以来现代西方哲学的直接延伸与演变，呈现多元性，流派林林总总，表现为从科学主义向人文主义思潮的转变，科学的思维方式向人文思维方式的转变。后现代主义哲学是这一趋向的发展结果，在哲学思潮渗透下，地理学亦呈现出百花齐放的多元化。全球性问题的出现，促使哲学的对象、功能、研究方法再次形成重大的调整和转换。哲学本身的危机也在全球性问题的探索中有了新的出路。     

快淬对贮氢合金组织和电化学性能的影响

通过XRD、TEM、DTA分析和电化学实验 ,研究了快淬对贮氢合金组织和电化学性能的影响。研究表明 ,成分均匀性改善和单胞体积减小是影响快淬贮氢合金电化学性能的主要因素 ,其中 ,前者使充放电循环稳定性提高 ,后者使放电容量降低。在本研究中 ,快淬速度为 10m/s时 ,合金成分的均匀性已较铸态有明显改善 ,更高的快淬速度并不能使成分的均匀性进一步大幅度提高 ,反而使单胞体积减小 ,因此 ,快淬速度为 10m/s时 ,快淬合金的综合电化学性能最佳。     

二维透明物的一步彩虹全息新方法

本文提出一种拍摄二维透明物体的一步彩虹全息新方法，进行了理论分析并给出了实验结果。     

鲤鱼精液超低温冷冻保存及冻精的杂交授精试验研究

本文以鲤鱼(Cyprinus carpio)为材料,进行了鱼类精液冷冻保存的研究,以及冻精与红鲫(Carassius auratus,red variety)卵子的杂交授精试验。冷冻精液解冻活力为0.3—0.35。在液氮(-196℃)中保存1—2周后,杂交受精率为60.1～66.5%,最高受精率达73%。保存一年后的冻精率为31%。将鱼类精液冷冻保存技术的研究成果应用到杂交育种上,这在国内尚属首次。     

DNA凝胶电泳区带的定量

本文通过实验证实了DNA凝胶电泳图谱中区带的扫描吸收峰面积正比于DNA的质量。据此可以对区带中的DNA含量进行定量分析。为限制性核酸内切酶的动力学常数的测定提供了简单的方法。