Nd^3＋：YAG激光光纤治疗鼻前庭囊肿

自1984年10月至1985年12月底，我们直用Nd^3＋：YAG激光光纤治疗鼻前庭囊肿21例，现报道如下。     

Selective oxidehydrogenation of ethane with CO2 over CeO2-based catalysts

Ceria catalysts were found active and selective to the oxidehydrogenation of ethane (ODE) with CO₂ and the actual contribution for C₂H₄ formation from heterogeneous catalysis was 75–55% in the range 953–993 K. The presence of calcium ions in solid solution in the ceria crystalline network increased significatively the selectivity to ethene and the efficiency of CO₂ as oxidant in the heterogeneous reaction.     

Effect of truing of a diamond wheel on the strength of alumina after abrasive grinding

Abstracts are not published in this journal This revised version was published online in November 2006 with corrections to the Cover Date.     

装配式钢管混凝土柱-钢梁节点的性能分析及比选

为了研究装配式钢管混凝土柱-钢梁节点的抗震性能,在综述前人研究成果基础上,采用归一化方法比较了五种装配式钢管混凝土柱-钢梁节点的荷载比-位移比曲线、滞回环面积比-位移比曲线,对节点承载力、耗能性能、刚度退化等指标进行分析,探讨了装配式钢管混凝土柱-钢梁节点的抗震性能,并对节点的施工难易及成本进行对比分析.结果 表明:节点构造形式对节点的抗震性能有一定的影响.在小轴压比条件下,加强环式和内隔板式节点抗震性能更好,加强环式节点可通过设置外肋端板提高变形能力;从施工难易程度来看,加强环式和外肋环板式节点难度较其他节点更低;外肋环板式节点的单位极限承载力成本最低.总结的装配式节点形式为相同前提条件下的装配式钢管混凝土柱-钢梁节点的选择提供了参考,其他条件下的节点性能尚需进一步研究.     

Identification of Pathogenicity-Related Genes in Biofilm-Defective Acidovorax citrulli by Transposon Tn5 Mutagenesis

Biofilm formation is important for virulence of a large number of plant pathogenic bacteria. Indeed, some virulence genes have been found to be involved in the formation of biofilm in bacterial fruit blotch pathogen Acidovorax citrulli. However, some virulent strains of A. citrulli were unable to format biofilm, indicating the complexity between biofilm formation and virulence. In this study, virulence-related genes were identified in the biofilm-defective strain A1 of A. citrulli by using Tn5 insertion, pathogenicity test, and high-efficiency thermal asymmetric interlaced PCR (hiTAIL-PCR). Results from this study indicated that 22 out of the obtained 301 mutants significantly decreased the virulence of strain A1 compared to the wild-type. Furthermore, sequence analysis indicated that the obtained 22 mutants were due to the insertion of Tn5 into eight genes, including Aave 4244 (cation diffusion facilitator family transporter), Aave 4286 (hypothetical protein), Aave 4189 (alpha/beta hydrolase fold), Aave 1911 (IMP dehydrogenase/GMP reductase domain), Aave 4383 (bacterial export proteins, family 1), Aave 4256 (Hsp70 protein), Aave 0003 (histidine kinase, DNA gyrase B, and HSP90-like ATPase), and Aave 2428 (pyridoxal-phosphate dependent enzyme). Furthermore, the growth of mutant Aave 2428 was unaffected and even increased by the change in incubation temperature, NaCl concentration and the pH of the LB broth, indicating that this gene may be directly involved in the bacterial virulence. Overall, the determination of the eight pathogenicity-related genes in strain A1 will be helpful to elucidate the pathogenesis of biofilm-defective A. citrulli.     

生物质结渣固体碱催化剂制备生物柴油

采用经气化炉烧结的生物质结渣为固体碱催化剂,催化油脂转化合成生物柴油.对固体碱催化剂进行表征,并考察物质的量之比、反应温度、反应时间和催化剂用量对反应的影响.结果表明:生物质结渣固体碱催化剂主要成分(按质量分数计)为SiO2(40％～60％)、CaO(10％～20％)、K2O(10％～15％)、MgO(≤10％)、Al...     

车身外饰塑料件与车身涂层色差的改善和控制

介绍了外观色差控制的两大主流方向,并探讨分析了车身外饰塑料件与车身色差产生的原因,提出相应的车身外饰塑料件外观色差的控制方法。     

建筑节能的激励机制框架研究

分析建筑节能的实现途径和各市场主体对于建筑节能的积极性和参与程度,运用经济学中激励理论和机制设计理论的成果,研究各市场主体参与节能的条件,建立简化的模型框架,寻找市场主体参与节能的利益均衡点。     

多层防御反坦克阵地效能建模与仿真

现代反坦克防御作战中,陆军多采用武装直升机、车载式反坦克导弹与便携式反坦克导弹相结合的立体、多层部署的方法对重点区域进行防御。敌方常通过施放红外热源、烟幕等电子干扰方式来提高其生存能力和突防效率。基于排队论和反坦克作战理论,建立了电光干扰对抗环境下的多层防御反坦克阵地的排队服务模型,并对作战想定进行了仿真应用。仿真结果表明了模型的可信性和实用性。     

不同品种芒果的营养成分及风味物质分析

本论文以产自四川攀枝花地区的四种芒果（大黄芒、大青芒、鹰嘴芒、台芒）为研究对象,通过测定其各项营养成分指标并通过主成分分析 (PCA),结合其挥发性香气成分,对其进行综合评价。结果表明:糖酸比、β-胡萝卜素含量最高的是大黄芒,分别为16.47和4.06 mg/100 g;水分含量、可溶性糖、可滴定酸和总酚含量最高的是鹰嘴芒,分别为82.96%、21.22%、2.03%和0.73 mg/g;可溶性蛋白质含量最高的是台芒,为7.83 mg/g。主成分分析结果表明,芒果评价体系可由两个主成分来表征,综合排名由高到低为鹰嘴芒、台芒、大黄芒、大青芒。四种芒果的挥发性香气成分中,萜烯类化合物占比由高到低分别为大黄芒、鹰嘴芒、台芒、大青芒。本研究为攀枝花芒果产业发展划分提供了一定的理论依据。