PLC在组合机床控制中的应用与程序编制

介绍了日本三菱公司FXON系列PLC在两工位钻孔、攻丝组合机床上的应用;分析了组合机床的组成、功能及控制要求;给出了输入输出分配表;编制自动控制程序、状态转移图,并实现了故障检测诊断。     

面向FMS的计算机辅助工艺设计系统

介绍了一种以先进的柔性制造系统ＦＦＳ１５００－２为对象、针对墙板类零件的ＣＡＰＰ系统ＨＺＣＡＰ－ＡＰＴ总体结构，并提出一种描述零件信息的新方法。该系统以人机对话的方式输入零件的几何信息和工艺信息，由计算机自动生成零件的工艺文件和在ＦＦＳ１５００－２上加工的数控程序单。     

异步电机直接转矩控制系统仿真及实验研究

分析了异步电机直接转矩控制原理,建立了直接转矩控制系统的U-I模型,在理论研究的基础上,利用Matlab软件对DTC系统进行了仿真研究,给出仿真结果。最后利用TMS320LF2407A作为控制芯片,搭建了实验系统,并进行了实验,仿真和实验结果表明了该方案的可行性。     

Synthesis and Characterization of Novel Purpurinimides as Photosensitizers for Photodynamic Therapy

A series of novel purpurinimides with long wavelength absorption were designed and synthesized to develop novel and potential photosensitizers. These compounds were investigated through reduction, oxidation, rearrangement reaction and amidation reactions of methyl pheophorbide a. They demonstrated a considerable bathochromic shift of the major absorption band in the red region of the optical spectrum (695–704 nm). Newly synthesized purpurinimides were screened for their antitumor activities, and showed higher photodynamic efficiency against A549 cell lines as compared to purpurin-18 methyl ester. The results revealed the novel purpurinimides could be potential photosensitizers.     

铝型材生产含铬废水处理工艺研究

为使铝型材生产产生的含铬废水的处理出水达到Cr6+≤0.5 mg/L要求,分别选用Na2SO3和Na2S2O5进行还原沉淀处理,并对影响处理效果的因素进行了分析比较。结果表明,还原处理铝型材生产产生的含铬废水时,Na2S2O5的投加量可比Na2SO3减少25.0%～37.5%;处理过程中,应控制混凝沉淀pH为8.2～9.0、PAM投加量为0.010g/L、沉淀时间为1~2 h。     

Tuning electronic structure and optical properties of ZnO monolayer by Cd doping

Structural, electronic and optical properties of Cd-doped ZnO monolayer have been investigated using first-principles density-functional theory based on the local density approximation plus Hubbard U approach, which precisely predicts the band gap. The formation energy of doped system is negative, implying a stable incorporation of Cd. The band gaps of Cd-doped ZnO monolayer decrease with increasing Cd concentration. Furthermore, Cd doping is found to result in a red-shift of the absorption peaks, enhancing the visible light absorption. These findings demonstrate that Cd-doped ZnO monolayer could display potential application in optoelectronic and photocatalytic fields.     

光谱法研究硫堇与人血清白蛋白的相互作用

用荧光光谱、紫外-可见吸收光谱和圆二色谱等光谱方法研究了生理条件下硫堇(TH)与人血清白蛋白(HSA)的作用机理.测得不同温度下,硫堇与人血清白蛋白的结合常数和结合位点数,确定硫堇对人血清白蛋白荧光的猝灭是静态猝灭过程,并依据Forster无辐射能量转移理论获得了TH与HSA的结合距离4.604 nm,热力学参数Δ H =-9.024 kJ/mol,Δ S =40.63 J·mol-1·K-1,表明TH与HSA主要为静电力相互作用,同步荧光光谱和圆二色谱显示了TH对HSA的二级结构构象产生影响.     

浅析当前绿色建筑在我国发展中存在的问题

从可持续发展和绿色建筑理念的角度,对我国绿色建筑发展现状和当前建筑规划设计、施工运营等几方面存在的问题进行了分析,并针对以上各方面问题就如何促进绿色建筑的发展提出了一些建议.