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排序方式: 共有43条查询结果,搜索用时 15 毫秒
1.
木合塔尔 《电脑编程技巧与维护》2010,(4):37-39
用程序把DBF表自动转换一个记录为一个文件的HTML格式的文件,用PHP代码模拟实现数据库功能,实现基于文件的静态Web查询。 相似文献
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从新疆石河子市一处工业污水(pH11.0)中分离到一株碱性果胶酶产生菌,编号XJU-8。应用形态学检测、生理生化实验、16S rDNA序列分析、系统进化分析对菌株进行多相鉴定。XJU-8可在pH5.0~13.0的LB培养基上生长,最适生长温度37℃。16S rDNA序列构建的系统进化树表明XJU-8与Bacillus claussi类聚在一起,而且序列同源性高达99%以上。XJU-8与B.claussi GMBAE 42在氧化酶,柠檬酸盐利用和水解Tween-40、Tween-60上有差异,且XJU-8有宽范围pH值耐受性,被认为是B.claussi的一个新品系。该菌产生的碱性果胶酶最适pH10.0,最适温度50℃,在pH9.0~12.0有较高活性和稳定性。酶活性可被Ca2+盐激活。XJU-8所产碱性果胶酶特性良好,工业应用潜能巨大。 相似文献
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The solubility of chlorine in aqueous hydrochloric acid solutions was studied. The effects of HCl concentration and temperature on the solubility were evaluated, and the thermodynamic parameters of the dissolution were calculated. It was found that the solubility isotherms had a minimum at about 0.5M HCl concentration at all the temperatures studied and that solubility decreased with the increase of temperature at all the HCl concentration range investigated. 相似文献
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介绍采用数码自动加脂器为机械设备的部分轴承自动加入脂润滑的工作过程和原理。与传统手工加脂方式相比,节省了人力和物力,并使轴承保持在良好的环境下运行,延长其使用寿命。 相似文献
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Zafer Karag>olge Mahir Alkan M. Muhtar Kocakerim 《Metallurgical and Materials Transactions B》1992,23(4):409-413
The dissolution kinetics of colemanite, a boron-containing mineral, in aqueous disodium EDTA solutions were studied. The effects
of concentration and pH of the solution, particle size, and temperature were examined. A decrease in pH and particle size
increased the dissolution rate, while an increase in the concentration of the solution and temperature increased the rate.
The activation energy and pre-exponential factor were calculated as 50.6 kJ mol-1 and 5.14 x 107 m s-1, respectively.
Mahir Alkan, Assistant Professor, formerly with Atatürk University, Kazim Karabekir Faculty of Education 相似文献
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Recep Boncukcuo?lu M.Muhtar Kocakeri?mVahdettin Tosuno?lu 《Cement and Concrete Research》2002,32(1):35-39
Large quantities of industrial wastes form in boron industry in Turkey every year. These wastes have dual problems of disposal and health hazards. The wastes such as borax slime, tincal waste, concentration wastes and thromel sieve waste (TSW) contain impurities that accelerate the normal setting and hardening of building materials produced from them. In this study, it was aimed to stabilize TSW produced during manufacture of borax from tincal. The effects of TSW added on the mechanical properties of Portland cement prepared by adding TSW to clinker were investigated. The utilization of TSW in cement industry as an additive was tested and compared with other materials. 相似文献