Surface Hardening of High-Strength Low Alloy Steels (HSLA) Dual-Phase Steels by Ball Burnishing Using Factorial Design

Burnishing is used increasingly as a finishing operation which gives additional advantages such as increased hardness, fatigue strength, and wear resistance. Experimental work based on 3⁴ factorial design was carried out to establish the effects of ball burnishing parameters on the surface hardness of high-strength low alloy steels (HSLA) dual-phase (DP) steel specimens. Statistical analysis of the results shows that the speed, feed, lubricant and ball diameter have significant effect on surface hardness.     

Increasing the Complexity of Magnetic Core/Shell Structured Nanocomposites for Biological Applications

This Review article ponders core/shell structured nanoparticles that can be prepared with features that combine properties of different materials, including ligands that enhance their biocompatibility. These nanocomposites are not classified in terms of synthesis, but rather by how these features are distributed in the final morphology, attending to connected or isolated materials that end up in interacting or not‐interacting functionalities. In particular, we have focused on magnetic core/shell‐structured particles with a directly connected, coupled, or isolated second functionality. The current progress on methods in colloidal solution that have allowed the great development of these multifunctional magnetic and active spheres on biological and biomedical fields is reported.     

Analysis of culture fluorescence by a fiber-optic sensor inNicotiana tabacum plant cell culture

The on-line sensing of viable cell weight in plant cell culture process is applied to analysis and control of process. The fiber-optic fluorescence sensor was constructed to measure the NADH-dependent fluorescence inNicotiana tabacum plant cell culture and the analysis of fluorescence signal was done to be correlated with the viable cell weight. The structured kinetic model for cell growth was proposed to estimate the theoretical viable cell weight. The dimensional analysis was proposed for the interpretation of fluorescence signal, in which the path length, the inner filter effect and the hydrodynamic conditions were considered as the key factors on fluorescence signal. The dimensional analysis and empirical correlation of fluorescence signal to viable cell weight was applied to the interpretation of the detected fluorescence signal during cultivation. The proposed interpretation of fluorescence signal using dimensional analysis was well correlated with the viable cell weight estimated by the structured kinetic model as well as by empirical correlation.     

Synthesis of a Polyaminopolycarboxylic Acid and Fluorescence of Tb~(3 ) Complexes in Aqueous Solution

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丙烯腈急冷塔喷淋系统流道分析与优化

对国内现有丙烯腈装置急冷塔循环液喷淋器的分流流道进行了研究。对喷头堵塞情况作了理论分析，并运用计算机编程模拟计算出喷淋器中各喷头的流体分布情况。在此基础上提出了分流流道的优化方案，从而改善了急冷塔内的操作状况，减少了丙烯腈在急冷塔内的损失。     

DIN-100MnCrW4模具钢开裂原因分析

对DIN－100MnCrW4模具钢开裂原因进行了分析。结果表明，模具钢 属淬火开裂，主要原因是材料内部组织不均匀所致。     

无荧光防塌降失水剂KH－931的合成与性能

ＫＨ－９３１是以褐煤、丙烯酰胺、丙烯腈为原料制得的无荧光防塌降失水剂。本文简介了ＫＨ－９３１的合成条件，并对ＫＨ－９３１的防塌作用与降滤失作用进行了室内评定。实验结果表明，ＫＨ－９３１的防塌、降失水效果良好，并具有加量少、无荧光的特点。腐殖酸衍生物，降滤失剂，页岩抑制剂，多功能钻井液处理剂，荧光性，实验室研究     

球磨机衬板材料及热处理工艺

对传统的中碳低合金耐磨铸钢的化学成分和热处理工艺进行了优化设计 ,使新材料具有较高的强度、硬度和韧性 ,因而抗冲击、抗疲劳、抗磨损性能良好。实际应用表明 ,用此种材料代替油淬和风冷中碳低合金耐磨铸钢 ,不仅生产成本低 ,而且在矿山、电力球磨机制粉等工矿条件下 ,其使用寿命长