浅述希夫碱及其金属配合物的由来、产生机理、合成方法及展望

主要叙述Schiffbase及其配合物的由来、合成方法及如何提高Schiffbase生成的化学反应速度,简单介绍了Schiffbase配合物的应用,Schiffbase的发展方向.     

新型金属切削液的研制

根据金属切削液的基本理论和发展趋势,针对金属切削乳化油存在的不足,提出了采用20#机械油作基础油、采用精脂酸和松香与混合碱(NaOH和KOH按1∶1质量比形成的混合物)反应后形成的混合皂作乳化剂、采用低分子醇(如乙醇)作乳化稳定剂、加入复合型的防锈剂和极压剂来生产新型金属切削液方案,通过单因素实验方法和正交实验方法对乳化剂、防锈剂、稳定剂和极压剂进行了比选,确定出了适宜的乳化剂、防锈剂、稳定剂和极压剂及其用量．     

电炉用金属炉料的研究

由于冶金短流程的发展受到优质废钢供应短缺和价格增长等因素的影响，促使生产者必须使用大量劣质废钢作金属炉料。在废钢中配入一定量的冷生铁、直接还原铁、热装铁水、脱碳粒铁、碳化铁、复合金属料已经成为现代电弧炉冶炼的主流趋势。本文论述了各自金属炉料的特点，以及对冶炼工艺的影响。     

MasterCAM环境下刀具切削参数的自动优化方法

针对MasterCAM软件中刀具切削参数不能随工件材料、刀具材料以及切削类型的变化而自动优化的状况,介绍了刀具切削参数自动优化的基本原理,并通过对MasterCAM刀具库和材料库的二次开发,实现了刀具切削参数的自动优化功能。     

Cutting force and its frequency spectrum characteristics in high speed milling of titanium alloy with a polycrystalline diamond tool

In this paper, a series of experiments were performed by high speed milling of Ti-6.5Al-2Zr-1Mo-1V (TA15) by use of polycrystalline diamond (PCD) tools. The characteristics of high speed machining (HSM) dynamic milling forces were investigated. The effects of the parameters of the process, i.e., cutting speed, feed per tooth, and depth of axial cut, on cutting forces were studied. The cutting force signals under different cutting speed conditions and different cutting tool wear stages were analyzed by frequency spectrum analysis. The trend and frequency domain aspects of the dynamic forces were evaluated and discussed. The results indicate that a characteristic frequency in cutting force power spectrum does in fact exist. The amplitudes increase with the increase of cutting speed and tool wear level, which could be applied to the monitoring of the cutting process.     

球墨铸铁等温淬火前后切削加工性能研究

球墨铸铁等温淬火后力学性能大大增强,但切削加工性随之变差。分析热处理后材料微观组织的变化,并采用晶体压电传感测力仪、电荷放大器及计算机组成的切削力数据采集系统测量陶瓷刀具干切削球墨铸铁（DI）及等温淬火处理后的球墨铸铁（ADI）时的切削力。比较不同切削深度、进给速度及切削速度下,DI和ADI两者之间切削力大小关系,观察两者切屑形态的异同,研究球墨铸铁等温淬火前后切削加工性能的变化。结果表明,等温淬火后随着金相组织的转变,材料力学性能大幅增强,切削力大幅增加,切屑短小崩碎．易飞溅,切削加工性能明显变差。     

自动双刀多功能划线机切割机构的设计

本文详细介绍了自动双刀多功能划线机切割机构的设计原理。     

Surface Investigation of Metal Threads and Solid Metals of Ottoman Textiles in the Topkapi Palace Museum

ABSTRACT

We analyzed 53 historical textile samples from a collection of caftans and brocades dating between the sixteenth and nineteenth century in the Topkapi Palace Museum (TPM) by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). Data were collected on the type, dimensions, elemental composition, and level of corrosion. The technique is presented in this work as an efficient and micro-destructive tool for the characterization of the structure of historical metal threads. SEM-EDX analysis for different energies was performed on a selection of gold and silver threads belonging to the historical textiles. The results were interpreted via laboratory prepared samples of gilt Ag and sulfur reacted Ag at different thicknesses for Au and Ag₂S layers respectively. A series of Au–Ag alloys for different Au/Ag ratios were prepared for comparative analysis. The threads were made of metal strips wound around a silk core. Metal wires and flat strips were also used. The use of differential energies allowed for differentiating strips and wires made of homogeneous silver and gold alloys from the ones coated with a thin gold layer. Analysis of EDX data revealed that the Au film thickness was very thin (10–60?nm). Formation of Ag₂S layers over the thin Au film as thick as 1.5?µm was taking place. Formation of thinner Ag₂S layers over non-gilt Ag suggested different reaction mechanisms for gilt and non-gilt cases.     

“微课+翻转”混合式教学探索与实践--以“金属材料综合实验”课程为例

人工智能、大数据、云计算等新兴技术推动了教育技术的变革,MOOC、微课、翻转课堂等新的教学模式应运而生。以“金属材料综合实验”课程为例,以提升学生的应用能力、思辨能力和创新能力为教学目标,尝试将微课、翻转课堂融合并应用于一线教学,从课程内容优选、教学形式设计与实施、课程考核方式、教学质量评估与持续改进四个方面进行思考,提出优选课程内容的方法,分析开展微课、翻转课堂混合式教学的可能性,探讨注重过程评价的课程考核方式,介绍了金属材料综合实验课程教学实践经验。     

毕节铅、锌矿区重金属污染及优势植物累积特性分析--以毕节妈姑和金钟铅、锌矿区为例

重金属的开采和冶炼不仅破坏生态平衡,而且严重威胁人类的健康。以毕节地区2个铅锌矿为研究对象,采用现场采样、室内分析的方法,调查研究了该地区土壤及优势植物中重金属含量。结果表明：研究区土壤主要受到Pb、Zn、Cu、Cd四种重金属污染,其中,Cd污染最为严重,Pb、Zn为轻度污染。优势植物重金属含量测定表明,野艾蒿属于重金属富集型植物,苦苣菜属于规避型植物,马刺蓟属于根部囤积型植物。以上几种优势植物对重金属均具有一定的耐性,可以作为铅锌矿区弃地植物修复的优选物种。