不同产地的叶蜡石矿结构分析

分析了我国各地的叶蜡石矿结构,并对同一产地不同时间开采的叶蜡石及同一产地不同矿山的叶蜡石矿结构变化进行了跟踪,总结了不同结构叶蜡石加热变化的情况和在玻璃纤维生产中稳定叶蜡石质量需注意的问题。     

X射线荧光光谱法测定叶蜡石、高岭土的化学成分

叶蜡石、高岭土是玻璃纤维行业生产最主要原料。随着玻璃纤维行业的发展,其用量每年大幅度上升,因此对于叶蜡石质量要求越来越高。传统的湿化学方法已经很难满足要求。本文阐述了采用熔融制样x射线荧光光谱法测定叶蜡石、高岭土的SiO2、Al2O3、Fe2O3、TiO2、K2O、Na2O、CaO、MgO、S这9种成分的含量,所得结果与化学分析结果相符,同时采用荧光光谱法更为迅速快捷,是实际生产中的化学成分分析的一种有效方法。     

我国玻纤用叶蜡石资源保障性分析

玻璃纤维是一种新型的工程材料,具有不燃、耐腐蚀、耐高温、吸湿小、伸长小等优异性能,应用领域十分广泛。2018年全球玻璃纤维产量775万t,我国产量468万t,占全球产量的60%,位居世界第一。2011～2018年,我国玻纤年均增长率为7%,未来5～8年仍处于高速发展期。查明我国玻纤用叶蜡石资源储量,准确预测玻纤行业对资源的需求,尽早提出资源保障措施,对我国玻纤行业可持续发展具有重要现实意义和战略意义。采用动态方法计算了我国玻纤用叶蜡石资源的保障程度,并提出了5条措施或建议。     

叶蜡石成分分析方法的选择与验证

详细阐述了制定《叶蜡石化学分析方法》标准过程中对叶蜡石成分分析方法选择的原则、新方法的建立、解决的问题,给出了验证试验的数据及重复性限.该标准的制定对玻璃纤维生产用叶蜡石成分的控制具有重要的指导意义.     

叶蜡石的均化

介绍了叶蜡石均匀性对玻璃纤维池窑拉丝影响情况,通过对叶蜡石均匀性的实验找出了如固体粒子的粒度及粒度分布、均化仓的仓容、均化设备的性能、均化次数及均化时间等影响叶蜡石均化效果的因素.叶蜡石的均匀性用SiO<,2>、Al<,2>O<,3>的标准偏差来表示.     

白泡石在玻璃纤维生产中的应用研究

研究了白泡石在重庆地区的分布、贮量、品位,与叶蜡石、高岭土、石英粉在成分上对比。通过实验,确定白泡石在玻璃纤维生产中应用的可行性,经过加工后在玻璃纤维生产线实际使用,完全可以取代玻璃配方中含Al2O3和SiO2的叶蜡石、高岭土、石英粉,效果显著,成本明显降低。     

浅谈玻璃纤维行业的物流管理

本文分析了玻璃纤维行业的物流现状和特点,指出现代物流对玻璃纤维行业的发展产生积极影响.     

我国叶蜡石的开发研究及其应用现状（上）

介绍了叶蜡石的性能、分类以及在我国的分布情况,详细阐述了叶蜡石在石雕工艺品、复合材料、陶瓷耐火材料、高温高压合成中作为传压密封介质中的应用现状。分析了叶蜡石在开发应用中存在的问题,并提出建议。     

我国叶蜡石的开发研究及其应用现状（下）

介绍了叶蜡石的性能、分类以及在我国的分布情况,详细阐述了叶蜡石在石雕工艺品、复合材料、陶瓷耐火材料、高温高压合成中作为传压密封介质中的应用现状。分析了叶蜡石在开发应用中存在的问题,并提出建议。     

对我国玻璃纤维工业发展道路的思考

对我国玻璃纤维工业发展道路的思考珠海玻璃纤维有限公司洪继兴胡国良危良才１我国玻璃纤维工业的现状我国玻纤行业在近４０年的发展历程中，虽然道路坎坷，几经起伏，但自“七五”以来，无论从产量增长，品种开发，生产规模或工艺技术上都年年踏上新台阶。即便如此，但由...     

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.     

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。     

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。     

我国硝酸工业生产技术新进展

系统叙述了我国硝酸工业2000-2007年生产现状及主要技术成果,尤其指出了国产"四合一"机组的成功投运,使我国硝酸国产化装置取得较大的进步,表现在吨酸的铂耗、氨耗和能耗等方面接近国外引进装置水平,同时介绍了国外双加压法硝酸生产技术的进展.我国已成为硝酸生产大国,仍需以先进的技术改造和发展我国硝酸工业,确保我国硝酸工业健康有序地发展,加快从硝酸生产大国向强国迈进的步伐.     

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.