65Mn钢CCT曲线及圆锯片淬火工艺

用全自动相变测定仪测定了圆锯片常用６５Ｍｎ钢的连续冷却转为曲线，研究了不同连续冷却速度下得到的组织，为合理制订圆锯片的淬火工艺提供了依据，得到了最佳淬火工艺曲线。     

The Histidine Phosphocarrier Kinase/Phosphorylase from Bacillus Subtilis Is an Oligomer in Solution with a High Thermal Stability

The histidine phosphocarrier protein (HPr) kinase/phosphorylase (HPrK/P) modulates the phosphorylation state of the HPr protein, and it is involved in the use of carbon sources by Gram-positive bacteria. Its X-ray structure, as concluded from crystals of proteins from several species, is a hexamer; however, there are no studies about its conformational stability, and how its structure is modified by the pH. We have embarked on the conformational characterization of HPrK/P of Bacillus subtilis (bsHPrK/P) in solution by using several spectroscopic (namely, fluorescence and circular dichroism (CD)) and biophysical techniques (namely, small-angle X-ray-scattering (SAXS) and dynamic light-scattering (DLS)). bsHPrK/P was mainly a hexamer in solution at pH 7.0, in the presence of phosphate. The protein had a high conformational stability, with an apparent thermal denaturation midpoint of ~70 °C, at pH 7.0, as monitored by fluorescence and CD. The protein was very pH-sensitive, precipitated between pH 3.5 and 6.5; below pH 3.5, it had a molten-globule-like conformation; and it acquired a native-like structure in a narrow pH range (between pH 7.0 and 8.0). Guanidinium hydrochloride (GdmCl) denaturation occurred through an oligomeric intermediate. On the other hand, urea denaturation occurred as a single transition, in the range of concentrations between 1.8 and 18 µM, as detected by far-UV CD and fluorescence.     

液压-齿轮-齿条圆弧分型抽芯压铸模设计

给出了龙头体液压-齿轮-齿条圆弧分型抽芯压铸模实用结构，论述了模具的浇铸系统、结构特点和工作原理。该模具采用扇形龄轮-齿条机构实现龙头体铸件的侧向圆弧分型抽芯，同时通过相应的两套斜销滑块机构分别实现龙头体铸件另外两个方向的侧向分型抽芯。     

金属薄板的精密剪切

详细地叙述了精密分条圆盘刀片在金属薄板精密剪切中的重要性,并介绍了圆盘刀片的正确使用方法.文中的一些数据和用刀的观念对国内快速发展的金属薄板的加工行业有参考价值.     

柔性分离盘抑制圆柱涡激振动的风洞试验

该文利用附属柔性分离盘对圆柱涡激振动(VIV)控制问题进行了风洞试验研究。针对弹性支撑的圆柱及不同长度柔性分离盘的试验模型,在雷诺数7 500-40 000情况下,测定不同约化速度(3.5-18.7)下的振动瞬态位移。结果表明:柔性分离盘长度(L)/圆柱直径(D)比为0.6、0.8和1三种圆柱的横向无因次均方根振幅远小于单圆柱,涡激振动抑制效果很好,均在77.6%以上,其中L=0.8D的圆柱抑制效果最佳,几乎无振动;而L=1.2D和1.5D的圆柱反而出现振动增强,约4.5%和9%。对比单圆柱的共振区,附属柔性分离盘的圆柱共振区在约化速度上更靠后且范围更大。     

21世纪新玻璃的发展

新玻璃是指与传统玻璃相比具有不同性质、功能和用途,或采用与传统玻璃不同的成分、原料和制备工艺而得到的玻璃材料及制品.在以信息技术为主导、多门高新技术为支柱的新经济时代,新玻璃主要用于信息技术、生命科学、新能源与再生能源、新材料、海洋科学、环境保护方面.本文阐述了新玻璃的特征、品种、制备与发展.     

电凝聚方法处理聚氯乙烯工业废水试验

对电凝聚方法处理聚氯乙烯工业废水的效果及影响因素进行了分析研究。现场运 行结果表明,该方法试验装置对聚氯乙烯废水的处理效果较好,出水水质达到综合排放 标准,对COD,BOD和TSS的去除率分别达到95％,91％和90％;对废水流量负荷的变化 具有较好的适应性,保证出水水质稳定;装置的运行成本经济实用。     

A tutorial review of economic model predictive control methods

An overview of the recent results on economic model predictive control (EMPC) is presented and discussed addressing both closed-loop stability and performance for nonlinear systems. A chemical process example is used to provide a demonstration of a few of the various approaches. The paper concludes with a brief discussion of the current status of EMPC and future research directions to promote and stimulate further research potential in this area.     

焦化装置掺炼催化裂化油浆技术经济分析

通过油浆掺炼小试, 对以加工管输原油等中间基原油为主的安庆炼厂焦化装置掺炼RFCC油浆生产中的物料平衡、产品质量、生产操作、经济效益等方面进行了分析，阐述油浆掺炼将导致焦化装置液收下降、气体及焦炭产率上升，蜡油芳烃含量上升，不利于提高装置加工量及经济效益的提高