7×（3+9+15×0.22）+0.20HT钢丝帘线在全钢巨型工程机械子午线轮胎中的应用

研究7×(3+9+15×0.22)+0.20HT钢丝帘线在33.00R51全钢巨型工程机械子午线轮胎中的应用.结果表明,以7×(3+9+15×0.22)+0.20HT钢丝帘线替代7×(3+9+15×0.245)+0.245HT钢丝帘线用于全钢巨型工程机械子午线轮胎胎体和带束层,成品性能满足国家标准要求,产品经矿山使用验证未出现因钢丝帘线变化引起的不良反馈,同时可减小轮胎质量,降低生产成本.     

7×7×0.25＋0.15HT钢丝帘线在全钢工程机械子午线轮胎中的应用

以7×7×0.25+0.15HT钢丝帘线替代3+9+1 5×0.245HT钢丝帘线应用于全钢工程机械子午线轮胎带束层和胎体。结果表明,以7×7×0.25+0.15HT钢丝帘线替代3+9+15×0.245HT钢丝帘线后,成品轮胎的外缘尺寸满足国家标准的要求,胎侧变形减小,耐久性能提高。     

3+9+15×0.225HT钢丝帘线在全钢载重子午线轮胎胎体中的应用

研究3+9+15×0.225HT钢丝帘线在全钢载重子午线轮胎胎体中的应用.结果表明,以3+9+15×0.225HT钢丝帘线替代3+9+1 5×0.22+0.1 5钢丝帘线用于全钢载重子午线轮胎胎体,轮胎耐疲劳性能、胎体强度和胎圈耐久性能提高,承载能力增强.     

7×7×0.22+0.15HT钢丝帘线在巨型工程机械子午线轮胎胎体中的应用

研究7×7×0.22+0.15HT钢丝帘线在巨型工程机械子午线轮胎中的应用。结果表明,7×7×0.22+0.15HT高强度钢丝帘线用于标准单胎负荷低于50t的巨型工程机械子午线轮胎胎体,轮胎性能达到国家标准要求,用户反映良好。     

4+6×0.30HTBetru(R)钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究4+6×0.30HT Betru(R)钢丝帘线在全钢载重子午线轮胎中的应用.试验结果表明,以4+6×0.30HTBetru(R)钢丝帘线代替3+9+15×0.22+0.15NT钢丝帘线用于全钢载重子午线轮胎带束工作层,轮胎外缘尺寸基本无变化,强度性能相当,耐久性能略有提升.从有限元分析结果看,轮胎印痕和下沉量及胎肩部位应变能密度基本一致.通过实际装车试验及市场评价结果看,采用4+6×0.30HT Betru(R)钢丝帘线轮胎的胎肩脱层退赔率略有降低.从成本分析看,4+6×0.30HT Betru(R)钢丝帘线优势明显.     

3+9 15×0.25 0.15ST钢丝帘线在全钢丝子午线工程机械轮胎中的应用

本文研究了3+9 15×0.25 0.15ST钢丝帘线在全钢丝子午线工程机械轮胎胎体中的应用。实验结果表明,3 9 15×0.25 0.15ST超高强度钢帘线替代7×7×0.22 0.15HT钢丝帘线用于26.5R25全钢丝子午线工程机械轮胎胎体中,成品胎耐久性能提高,轮胎重量减小,生产成本降低。     

3×0.24+9×0.225HT钢丝帘线在全钢载重子午线轮胎胎圈包布中的应用

研究3×0.24+9×0.225HT钢丝帘线在全钢载重子午线轮胎中的应用.试验结果表明,以3×0.24+9×0.225HT钢丝帘线替代3+9+15×0.175+0.15钢丝帘线用于11.00R20全钢载重子午线轮胎胎圈包布,在保证轮胎成品性能的同时,可减小轮胎质量和降低生产成本.     

3+9+15×0.245HT钢丝帘线在全钢工程机械子午线轮胎胎体中的应用

研究3+9+15×0.245HT钢丝帘线在全钢工程机械子午线轮胎中的应用。结果表明,以3+9+15×0.245HT钢丝帘线替代3+9+15×0.22+0.15钢丝帘线用于全钢工程机械子午线轮胎胎体,成品轮胎外缘尺寸符合国家标准要求,耐久性能提高,满足运提一体机的使用要求,成本略有上升。     

26.5R25 ETSC全钢工程机械子午线轮胎的设计

介绍26.5R25ETSC全钢工程机械子午线轮胎的设计。结构设计:外直径1730mm,断面宽662mm,行驶面宽度620mm,行驶面弧度高24mm,胎圈着合直径628.5mm,胎圈着合宽度558mm,断面水平轴位置(H1/H2)0.8117,花纹深度24mm,花纹周节数28,花纹饱和度81.7%,采用折线形花纹设计。施工设计:胎体帘布层采用7×7×0.22HT钢丝帘线,带束层采用2层3×7×0.2HT钢丝帘线和3层3+9+15×0.22HT钢丝帘线;采用四鼓式全钢工程机械子午线轮胎成型机成型,液压硫化机硫化。成品性能试验结果表明,充气轮胎的外缘尺寸和物理性能均符合相应设计和国家标准要求。     

7×(3+9 15×0.22) 0.20HT钢丝帘线在33.00R51全钢巨型工程机械子午线轮胎中的应用

研究7×(3+9 15×0.22) 0.20HT钢丝帘线在33.00R51全钢巨型工程机械子午线轮胎胎体和带束层的应用。结果表明：以7×(3 9 15×0.22) 0.20HT钢丝帘线替代7×(3 9 15×0.245) 0.245HT钢丝帘线用于33.00R51全钢巨型工程机械子午线轮胎,轮胎成品性能满足国家标准要求,产品经矿山使用验证未出现因钢丝帘线变化引起的不良反馈,同时可减小轮胎质量,降低生产成本。     

佛山市顺德新城区降水中污染物的监测和分析

为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。     

Metabolism of trideuterated iso-lignoceric acid in rats in Vivo and in human fibroblasts in culture

Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders, but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-²H₃]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured. A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994.     

Phospholipid metabolism in cells in culture

The proportions of the different lecithin fractions have been determined in HeLa and KB tissue culture cells and Ehrlich Ascites tumor. 82.8% of the total phosphatidyl choline phosphorus is found in fraction 3 of HeLa cells. The major phosphatidyl cholines found in KB cells and Ehrlich Ascites tumor are in fractions 3 and 4 and representing 66.6% and 88.7% of the total phosphatidyl choline P, respectively. The incorporation of 1,2-¹⁴C-choline and 1,2-¹⁴C-ethanolamine into the various phosphatidyl choline fractions has been assayed to determine their biosynthesis in Ehrlich Ascites tumor. The incorporation of 1,2-¹⁴C-choline into fractions 3 and 4 is 100 times the 1,2-¹⁴C-ethanolamine. This evidence indicates that the methylation pathway of phosphatidyl choline synthesis is very low in HeLa, KB and Ehrlich Ascites cells. One of 13 papers presented at the symposium “Lipid Metabolism in Cells in Culture,” AOCS Meeting, Houston, May 1971. Part of a thesis submitted to the Graduate School of the University of North Dakota in partial fulfillment of the Degree of Master of Science.     

高效液相色谱法分析化妆品中微量成分的研究进展

综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。     

Denitrification in shallow groundwater in a coastal agricultural area in Japan

In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L^–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L^–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO₂ L^–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site.