烷基糖苷表面活性剂及其复配体系流变行为研究

以实验室自制的烷基糖苷(APG)为主要研究对象,考察溶液浓度、盐度以及复配体系中聚乙二醇(PEG)浓度对烷基糖苷溶液和复配体系溶液粘度以及流变性能的影响.实验结果表明,不同浓度烷基糖苷溶液呈现出不同的流变学特征,溶液浓度≥9%时,溶液由牛顿流体向非牛顿流体转变;盐浓度对烷基糖苷溶液影响显著,Na Cl浓度≥1%时,APG溶液由非牛顿性流体向牛顿流体转变;聚乙二醇与烷基糖苷复配后体系溶液的流变性能发生改变,聚乙二醇浓度较低时,复配体系为牛顿流体;聚乙二醇浓度较高时,复配体系呈现非牛顿流体特征.     

Highly Sensitive and Portable Gas Sensing System Based on Reduced Graphene Oxide

Graphene has been widely used in gas-sensing applications due to its large specific surface area and strong adsorption ability. Among different forms of graphene used as gas-sensing materials, reduced graphene oxide is one of the most convenient and economical materials to integrate with Si-based electronics, which is very important to graphene-based gas sensors. In addition, the stacking structure of graphene oxide flakes facilitates absorption and detection of gas molecules. Based on reduced graphene oxide, a highly sensitive and portable gas-sensing system was demonstrated here. Solution-based graphene oxide was cast on a chip like a TF memory card and then reduced thermally. A signal acquisition system was designed to monitor resistance variation as a sign of gas concentration. This miniature graphene-based gas sensor array demonstrates a new path for the use of graphene in gas-detection technologies. And the creation of a sensitive and portable graphene gas sensor also shows great potential in fields such as medicine and environmental science.     

实验增强赤子爱胜蚓纤溶酶活性及临床使用效果

用纤维蛋白平板法，测量溶圈面积，作为评定纤溶酶活性的指标，在适宜条件下，将赤子爱胜蚓干燥粉末浸泡在ＮａＣｌ、ＫＣｌ、ＭｇＣｌ２溶液中，可使赤子爱胜蚓纤溶酶活性提高４－５倍，对于提高溶栓制剂的药效具有实际应用价值。     

山西五台山亚高山草甸优势种群和群落的格局研究

研究了五台山海拔２４００－２８００ｍ之间的亚高山草甸优势种群和群落的分布格局，结果揭示了种群分布特征和群落生态特点，群落的格局与优势种的格局有密切关系，三类草甸的格局相近。     

给／吸电子取代基对PPV类聚合物重组能影响的DFT研究

用密度泛函理论（density functional theory，DFF）在B3LYP／6—311G基组水平上对（PPV）4、（PPV）4-S进行结构全优化，计算得到了它们的重组能，讨论了不同给／吸电子取代基对PPV类电致发光聚合物重组能的影响．结果表明，给，吸电子取代基都使得PPV聚合物的重组能降低，性质相同的不同取代基对PPV类聚合物体系内电子离域范围影响程度不同，若取代基能参与主链轨道形成，使聚合物体系内电子离域范围增大，重组能降低更加明显，聚合物的传输速率增大；另一方面取代基的引入如果使得分子整体平面结构扭曲变形，则共轭效应相对减小，重组能降低数值减小．     

柠檬酸盐溶胶-凝胶法合成Li3-2xZnxPO4及其离子导电性

采用柠檬酸盐溶胶－凝胶法制备了组成为Li3-2xZnxPO4(x=0.1-0.5)的固体粉末和饱结体,对其相结构的研究结果表明,当x=0.1-0.4时,烧结体是由γI-Li3PO4和α-Li4Zn(PO4)2两相构成的混合相,而x=0.5时,烧结体的相组成为α-Li4Zn(PO4)2单相,用这种合成方法得到样品的合成温度较传统的固相合成降低了约400℃,用交流阻抗技术测定了烧结体的导电性,随着组成的不同,样品显示不同程度的导电性,当x=0.5,相结构为α-Li4Zn(PO4)2时,样品具有最高的导电性,25℃时σ=1.66μS/cm.     

皮层脑电图在药物成瘾中的应用

药物成瘾有着极其复杂的神经机制,成瘾过程不同阶段的皮层脑电图可呈现某些特征性变化,用功率谱法和非线性动力学法分析成瘾过程中脑电图各频段的变化,发现成瘾后θ等低频段活动增加,γ频段活动呈相对减少的趋势,这表明成瘾过程中枢神经系统在功能上发生了适应性的改变.随着皮层脑电图的记录技术与分析手段的发展.植入式无线遥测记录技术提高了皮层脑电图的记录质量,非线性动力学法则更好地分析了皮层脑电图的动态变化过程,皮层脑电图研究在药物成瘾领域再次受到重视.     

连山油茶高产优质气候生产研究

油茶是全球四大木本食用油料之一,其产品油茶籽油是高级保健食用油.油茶经济价值很高,浑身是宝,深受广大消费者欢迎,在国内外市场一直供不应求.文章结合连山县油茶种植的油茶气候优势及高产优质进行了分析.     

Spatial variation in community structure of a subtropical evergreen broad-leaved forest: Implications for sampling design

With the full survey data for a 24-ha subtropical evergreen broad-leaved forest dynamics plot,we evaluated spatial variation in forest structure characteristics(basal area and aboveground biomass),and calculated the minimal sample size and total sampling area necessary to estimate the forest structure characteristics within 20%(±10%) of the observed values with 95% probability for particular quadrat sizes by using a computer program that is designed to simulate the sampling process by allowing different sized quadrats to be randomly located within the sampling region.We found that(1) based on the 600 20 m×20 m subplots,basal area and aboveground biomass displayed a high degree of variation,with respective coefficients of variation of 27% and 31%;(2) based on the computer simulation analysis,the variability of basal area and aboveground biomass decreased with increasing quadrat size.The number of quadrats required to achieve the specified degree of precision dropped sharply with the increase of quadrat size.However,the total sampling area increased with increasing quadrat size,suggesting that using several small quadrats across the sampling area is more efficient than using fewer larger quadrats.Results of this study are valuable for evaluating the reliability of previous research and may assist researchers in designing effective sampling strategies for future field surveys,particularly in subtropical evergreen broad-leaved forests in China.     

基于评论大数据的顾客感知产品质量评价

随着消费方式的升级，消费者对产品质量的要求提高，且对产品的诉求变化迅速，企业需要更及时地了解消费者对产品质量的态度，而通过传统的问卷方式获取消费者对产品的感知质量已经不能满足这一需求。为更及时地获取消费者对产品的感知质量，本文提出一种基于用户评论数据的消费者感知质量评价方法。该方法不仅能够缩减调研的时间和人工成本，还能帮助企业更快地找到消费者关注的产品质量属性，获得消费者对产品质量属性层面满意或不满意的程度。