4Cr5MoSiV1热作工具钢热形变组织模拟

建立4Cr5MoSiV1工具钢热变形过程的组织演化模型,以应用于DEFORM软件对其锻造过程进行全尺寸模拟.首先在大量热机械模拟实验数据的基础上,建立了基于Avrami方程的4Cr5MoSiV1工具钢奥氏体再结晶分数和再结晶晶粒尺寸计算模型,优化得到了模型的各项材料常数.对模型的预报结果与实验结果进行了对比验证,显示该模型的预测结果与实验结果具有良好的一致性,表明该模型及其优化后的参数可以应用于进一步热加工过程的全尺寸有限元模拟.     

Empirical to mechanistic modelling in high shear granulation

This paper gives an overview of the different models available for granulation in high shear mixers with a focus on applicability in the pharmaceutical industry. Three examples of applications are given. The examples indicate the potential of mechanistically based models for scale-up and the importance of understanding the dynamics of the granulation process. The first two examples show how the impeller torque can be modelled and predicted in the dry and wet mixing phases of the high shear granulation process, using a solid mechanics and a hierarchical multivariate model, respectively. In the third application the particle size distribution is modelled using population balances and it is shown how different operating conditions can be included in the coalescence kernel to describe the granule growth.     

Surface transformation of graphite or diamond following Highly Charged Ion irradiation

Highly Charged Ions (HCI) approaching surfaces at nm distances are known to extract a very large number of electrons from the target. Over dielectric surfaces, the positive holes left following the removal of the electrons cannot be immediately neutralized, thereby locally inducing a huge stress and creating permanent surface modifications on very small dots. We present in this paper experiments on the structural transformations induced by irradiation with HCI of graphite and diamond surfaces characterized using the Atomic Clock Property of the Hollow Atoms (ACPHA) technique.     

Oxidative Stability of Liposomes Composed of Docosahexaenoic Acid-Containing Phospholipids

Oxidative stability of liposomes made of (Docosahexaenoic acid) DHA-containing phosphatidylcholine (PC) was examined during preparation and storage. After preparation of the liposomes, the concentration of primary (conjugated dienes) and secondary oxidation products (Thiobarbituric acid-reactive substances, TBARS) were significantly higher compared to the initial value. During cold storage, formation of conjugated dienes and TBARS remained more or less constant in large unilamellar vesicles (LUV), whereas in mulitilamellar vesicles (MLV) they were seen to increase over a period of 21 days. Evaporation of solvent traces from a lipid film should preferably be done under nitrogen as vacuum evaporation was found to increase oxidation of the phospholipid.     

Local Signatures of High-Tc Superconductivity Possible Origin of the Pseudogap

We have studied buffer ions induced holes clustering in the CuO ₂ plane by means of embedded cluster quantum chemistry calculations. This instability is suggested by Raman spectroscopy to be characteristic of the pseudo-gappedfermi surface at T     

如何了解客房的利润贡献率全球信封联盟理事

首先,Anders Davidsson从对当今信封行业的认识开始本次演讲,并对Bong集团的情况进行了一个简短的介绍(如图1所示),演讲过程中还配合了一些真实案例.最后,Anders Davidsson向大家阐述了Bong集团是如何从对客户获利的分析中获得收益的,如图2所示.     

Derating factor for cable crossings with consideration of longitudinal heat flow in cable screen

In this paper, an extension of the previously published method for the calculation of the derating factors for cables crossing external heat sources is proposed. The extension takes into account the longitudinal heat flow in cable metallic screen. The proposed algorithm is illustrated in a numerical example considering a practical situation of a high voltage cable crossing a steam pipe.