轮胎炼胶生产能源管理系统

研究烷基二硫代磷酸锌TPZ在丁苯橡胶（SBR）/白炭黑体系中的应用。结果表明：在SBR/白炭黑体系中以TPZ等量替代促进剂DPG,TPZ具有类似促进剂DPG的活化作用,可降低胶料的滚动阻力,且更加环保;少量TPZ作为偶联活化剂用于SBR/白炭黑体系的母炼中,可以减小硅烷偶联剂用量,降低成本,提高填料分散性和偶联效率,从而使胶料获得更佳的物理性能和动态力学性能。     

Modeling Effects of Mass Transfer Rate and Catalyst Concentration on Biodiesel Production in Batch Reactors

This article presents a new approach to investigate the kinetics of sunflower and rapeseed oils methanolysis. Due to its heterogeneous nature, the methanolysis reaction is affected by different physical properties such as mass transfer coefficients and specific surface area of the dispersed phase. Considering these parameters, a model was developed, and was evaluated by comparing the results of the model with the experimental data found in the literature. The mean absolute deviation obtained for sunflower and rapeseed oils is 0.039 mol L^?1, which demonstrates the accuracy of the model. The results show that the mixing speed is more effective in the first few minutes of the process. Furthermore, at mixing speed above 700 rpm, the process is controlled only by the reactions. The rate of biodiesel production increases with increasing catalyst concentration; however, catalyst concentration above 1.5 wt% has little or no significant effect on the rate of biodiesel production. In addition, because of its higher activation energy the rapeseed oil transesterification is more temperature dependent than the sunflower transesterification.     

新能源在轮胎企业的应用

简单介绍新能源的类型和特点,主要阐述太阳能在轮胎企业的应用,并对其经济效益和社会效益进行了分析。新能源主要包括太阳能、地热能、生物质能以及风力、天然气水合物等其他清洁能源。利用价值最高的太阳能利用技术就是太阳能集热板。在轮胎企业,太阳能的应用主要体现在用集热板加热循环介质,通过热交换完成太阳能的利用。分析认为,轮胎企业使用太阳能的节能效果显著,发展前景广阔。     

Fidelity levels of DNA polymerases in tumorigenic state cells and serially transplantable tumor cells

The crystal structure of a calcium-bound form of bovine annexin VI has been determined with X-ray diffraction data to 2.9 A by molecular replacement. Six Ca2+ ions were found, five in AB loops, one in a DE loop. Two loops (II-AB, which binds calcium, and V-AB, which does not) have conformations that differ significantly from those in calcium-free, human recombinant annexin VI. There are only small differences between the calci- and the apo-annexin VI in the rest of the molecule. Calcium by itself does not promote a major conformational change.     

Organism-dependent fungicidal activities of azoles

We investigated the antifungal activities of itraconazole and voriconazole on Aspergillus species by time kill studies, and the results were compared with those obtained for Candida species. Exposure of Aspergillus fumigatus conidia to varying concentrations (1.25 to 10 microg/ml) of itraconazole and voriconazole resulted in cellular death; the cytocidal effect was time and concentration dependent. In contrast, no killing of Candida albicans occurred in the presence of itraconazole and voriconazole at concentrations as high as 10 microg/ml, although candidal growth was inhibited compared to the drug-free control. Amphotericin B (1.25 to 10 microg/ml), on the other hand, killed both A. fumigatus and C. albicans. Similar results were obtained for non-A. fumigatus aspergilli and non-C. albicans Candida species. These observations indicate that both itraconazole and voriconazole are cytocidal agents for Aspergillus species but not for Candida species, suggesting that azoles possess organism-dependent fungicidal activities.     

Isolation and identification of the cDNA encoding the pheromone biosynthesis activating neuropeptide and additional neuropeptides in the oriental tobacco budworm, Helicoverpa assulta (Lepidoptera: Noctuidae)

The present study is concerned with cloning and characterizing Has-PBAN cDNA which is 756 nucleotides long, isolated from the brain and suboesophageal ganglion complex (Br-Sg) of Helicoverpa assulta adults. The 194-amino acid sequence deduced from this cDNA possessed the proteolytic endocleavage sites to generate multiple peptides. From the processing of the prepro-hormone, it can be predicted that the cDNA has a PBAN domain with 33 amino acids and four additional peptide domains: 24 amino acid-, 7 amino acid-, 18 amino acid- and 8 amino acid-long sequences, with FXPR (or K) L (X = G, T or S) amidated at their C-termini. The amino acid sequence of all five predicted peptides, including the PBAN, are identical to that of Helicoverpa zea (Raina, A.K., Jaffe, H., Kempe, T.G., Keim, P., Blacher, R.W., Fales, H.M., Riley, C.T., Klun, J.A., Ridgway, R.L., Hayes, D.K., 1989. Identification of a neuropeptide hormone that regulates sex pheromone production in female moths. Science 244, 796-798 and Ma, P.W.K., Knipple, D.C., Roelofs, W.L., 1994. Structural organization of the Helicoverpa zea gene encoding the precursor protein for pheromone biosynthesis-activating neuropeptide and other neuropeptides. Proc. Natl. Acad. Sci., U.S.A. 91, 506-510). A single mRNA species corresponding to the size of Has-PBAN cDNA was detected from the Br-Sg of 1-3-day old female and male adults, and their expression was also at a similar level. Pheromone production was induced upon injection of female or male Br-Sg extracts or synthetic PBAN into the haemocoel of decapitated 1-3-day old female adults during the photophase when they are not supposed to produce pheromone. From these results, H. assulta adult females seem to use their own PBAN for regulating sex pheromone biosynthesis. Functions of the four other peptides ending with FXPR (or K) L in the Has-PBAN cDNA and of the male PBAN remain to be elucidated.     

Comparative study of susceptibilities of germinated and ungerminated conidia of Aspergillus fumigatus to various antifungal agents

Conidia are used as inocula for the in vitro susceptibility testing of Aspergillus fumigatus. Since the MIC is defined on the basis of visible mycelial growth, conidia should germinate and produce sporelings (germinated conidia) for monitoring of the growth inhibition and fungicidal activity of a drug. If a compound is capable of inhibiting germination of conidia while affecting or not affecting the growth of the organism, the MIC obtained will be the concentration of the drug required for the inhibition of conidial germination but not necessarily that required for inhibition of the growth of the organism. We investigated the susceptibility of germinated and ungerminated conidia to amphotericin B, itraconazole, voriconazole, and SCH56592. The MICs of various antifungal agents for germinated conidia were almost identical to those obtained for ungerminated conidia. In addition, both the germinated and ungerminated conidia were killed with almost equal efficiency by all of the compounds tested when exposed to the drugs for 24 h. These results suggest that either germinated or ungerminated conidia could be used as inocula for in vitro susceptibility studies of A. fumigatus with identical results.     

液体再生胶在全钢工程机械轮胎胎面胶中的应用

研究液体再生胶（简称LRR）在全钢工程机械轮胎胎面胶中的应用。结果表明：在胎面胶中以LRR替代松香和DCPD树脂,胶料的Fmax和FL－Fmax增大,t10和t90缩短;硫化胶的硬度和定伸应力增大,拉断永久变形和撕裂强度减小,压缩生热降低,损耗因子减小,弹性模量、粘性模量、DIN磨耗指数和阿克隆磨耗量增大,抗切割性能下降,Payne效应 降低。     

全钢载重子午线轮胎三角胶贴合卷折问题的原因分析及解决措施

对全钢载重子午线轮胎三角胶与钢丝圈贴合后发生卷折的原因进行分析并提出相应的解决措施。具体从三角胶尺寸、胶料特性、贴合方式和贴合温度4个方面进行分析,提出通过调整三角胶高宽比,缩短三角胶胶料的应力松弛时间,使用立式机械式贴合鼓,降低贴合温度,可以减少三角胶贴合卷折情况的发生。     

超长效防护蜡HG72C在半钢子午线轮胎胎面胶和胎侧胶中的应用

研究超长效防护蜡HG72C（简称防护蜡HG72C）在半钢子午线轮胎胎面胶和胎侧胶中的应用。结果表明：与普通防护蜡H3236相比,防护蜡HG72C的色谱峰呈双峰分布,异构烷烃质量分数较大;在胎面胶和胎侧胶中防护蜡HG72C均表现出优异的耐屈挠疲劳性能和耐臭氧老化性能,在硫化胶中形成的蜡膜较薄、表面平整、光滑、致密,起到了很好的防护效果,保持了轮胎良好的外观。