无机盐对水溶性稀土络合物添加剂性能的影响

本文简述了水溶性极压抗磨添加剂存在的问题，合成了水溶性十二烷基聚氧乙烯醚磷酸酯稀土络合物，考察了该类络合物添加剂在水中的极压抗生，提出一套衡量与比较添加剂抗磨和极压性能优劣的参数，并且针对实际应用中水质的不同，研究了阴阳离子对其在水中的摩擦学性能的影响。     

矿山基建合理确定建筑工程造价初探

结合北Min河铁矿基建过程中的工程实例，分析了建筑工程造价的确定步骤、影响因素，并对如何合理确定建筑工程造价等问题进行了初探。     

冶金矿山基建工程管理方法的思考

根据邯邢冶金矿山管理局北Min河铁矿5年基建工作的经验和管理实践，介绍了冶金矿山基建工程应抓好设计管理，工程合同管理，总图管理和监理工作的重要意义及一些做法。     

Numerical solution for dynamics of pneumatic DTH hammer system

The pneumatic down-the-hole(DTH)hammer is one of the efficient equipments used in medium hard to very hard rock drilling frield,and any change in its structure design affects all performance parameters of a pneuamtic DTH hammer directly.Yet,owing to the complexity of the dynamic interaction among the components in DTH hammer systems,until now it has been difficult to obtain reliable estimates of the design parameter affects.Thus providing an design parameter optimization and the layout of dynamics behavior of DTH hammer is of great importance.This paper documents the development and solution of a computational model for the dynamic response of a pneumatic DTH hammer.The model consists of rigid piston dynamics equation and chamber thermodynamics equations.The resulting model represented by a set of coupled nonlinear differential equations were computed in Visual C++ program.The developed solutions are used to perform a parametric study to illustrate the inffluence of the piston mass and supply pressure on the impact performance of DTH hammer system.     

金银花成分及加工

研究对近年来国内外金银花的活性成分、干制加工方法、功能成分提取和加工产品的相关研究进行了概括和讨论,并对其未来发展方向进行了展望。     

Gelation Property of Alcohol-Extracted Soy Protein Isolate and Effects of Various Reagents on the Firmness of Heat-Induced Gels

Gelation property, thermal property, protein subunits distribution, and molecular forces involved in gelation of alcohol-extracted soy protein isolate were investigated using texture analyzer, differential scanning calorimeter, sodium dodecyl sulfate polyacrylamide gel electrophoresis, and various reagents. Results showed that salts and pH played important roles in gel firmness, and a power law relationship between gel firmness and protein concentration was observed. The effects of various reagents revealed that disulfide bonds play a major role in soy protein gel formation, while the involvement of electrostatic interactions, hydrogen bonds, and/or hydrophobic interactions also occurred in gel networks. Thermal analysis indicated that both alcohol-extracted soy protein isolate and commercial soy protein isolate (isoelectric precipitation) have undergone serious denaturation, while the gel firmness of alcohol-extracted soy protein isolate was significantly greater than that of commercial soy protein isolate. Sodium dodecyl sulfate polyacrylamide gel electrophoresis image showed that there was almost no difference for protein subunits among alcohol-extracted soy protein isolate, commercial soy protein isolate, and soy powder. Hence, as an alternative environmental friendly extraction method, alcohol-extraction of soy protein isolate has a great prospect to replace presently applied isoelectric precipitation method.     

A sensitive analytical method for the component monosaccharides of the polysaccharides from a Tibetan herb Potentilla anserine L. by capillary zone electrophoresis with UV detector

A rapid and sensitive method was optimized and validated for the separation and quantification of derivatized monosaccharides in polysaccharide from Potentilla anserine L. using 1-naphthyl-3-methyl-5-pyrazolone (NMP) as precolumn derivatization reagent by capillary zone electrophoresis (CZE). On the basis of the optimum conditions, nine NMP-derivatized monosaccharides achieve baseline resolution within 16 min. The developed method has been successfully applied to analyze component monosaccharides of three Potentilla anserine L. samples, which were obtained by gradational precipitation with 50, 70, and 90% aqueous ethanol, respectively. The polysaccharide precipitated from 50% ethanol solvent was composed of fucose, mannose, xylose, glucuronic acid, glucose, rhamnose, galacturonic acid, galactose, arabinose in molar proportion of 1:1.65:1.99:5.08:7.38:8.14:13.05:27.41:39.02; the corresponding molar proportions for polysaccharide obtained from 70% ethanol solvent were 1:1.64:1.65:4.52:13.96:9.13:26.30:10.52:18.00; fucose and galacturonic acid were not found in the polysaccharide precipitated from 90% ethanol solvent, and mannose, xylose, glucuronic acid, glucose, rhamnose, galactose and arabinose were determined with molar proportion of 1:0.87:1.77:2.78:1.69:2.58:2.49. Quantitative recoveries of the component monosaccharides in the polysaccharide were in the range of 93.3–105.1% and the relative standard deviation (RSD) values fell within 3.4–6.3%, respectively. The results demonstrated that the proposed CZE method was precise and sensitive for the analysis of the composition of polysaccharide.     

糯小麦粉配粉对小麦加工品质的影响(Ⅰ)对理化特性的影响

通过对2种糯小麦和3种非糯小麦理化特性进行比较研究,并利用其中1种糯小麦与非糯小麦配粉,研究其对配粉理化特性的影响。结果表明:糯小麦制粉过程中产生的破损淀粉含量更高,具有极高的吸水能力;在RVA糊化过程中具有较短的峰值时间,低的回生值和低谷黏度,以及较高的衰减值;在DSC测试中还表现出较高的热力学转变温度和糊化焓。糯小麦粉的添加对配粉理化特性的影响因基础粉的不同而有较大差异。配粉的RVA曲线表现为双峰,回生值显著降低;一定比例的添加能够提高峰值黏度低的基础粉的峰值黏度;添加糯小麦粉对弱筋小麦粉的筋力影响较小,其粉力甚至因为面团延伸性的改善而得到增强;对于筋力较强的小麦粉,超过15%的添加量则会使稳定时间降低,但是对粉力的影响不大;添加韧性和延伸性都较低的糯小麦粉,能够提高配粉的吹泡延伸性而不降低其韧性,其原因有待于进一步研究。     

高效液相色谱法测定棉籽仁中棉酚的含量

目的：建立棉籽仁中棉酚含量的高效液相色谱测定方法。方法：采用ODS-C18 色谱柱(4.6mm × 200mm,5μm),柱温25℃,流动相为甲醇- 体积分数1% 磷酸溶液(85:15,V/V),流速1.0mL/min,检测波长235nm。结果：棉酚质量浓度在1.9～34.9μg/mL 范围内线性关系良好;棉酚的加标回收率为97.8%～100.3%,RSD值为0.4%～1.2%。结论：此法操作简便、快速、灵敏、准确,样品处理简便易行,适于测定棉籽仁中棉酚的含量。     

竹浆木聚糖酶预处理对常规CEH三段漂的影响

进行了竹浆木聚糖酶预处理对常规CEH三段漂影响的研究.实验结果表明:在总用氯量均为8.5%时,用木聚糖酶预处理的硫酸盐竹浆的白度增加了1.99%ISO;在用氯量减少了11.76%的条件下,酶预处理竹浆能够达到普通CEH三段漂的白度,同时,纸浆的裂断长、撕裂度和耐折度分别提高了7%、11%和32%;此外,用木聚糖酶预处理后再漂白工艺可有效降低废水污染负荷.