密集型快速冷却技术在热轧带钢生产线的应用

卷取温度对成品带钢的强度、伸长率等机械加工性能有重要影响。为适应增加F7轧机后导致的层流冷却线的缩短,在层流冷却改造中采用了新型超密集快冷装置(SUPIC-HSM),提高了热轧带钢冷却效率、冷却能力、冷却均匀性和冷却板型的控制能力,有效适应了生产线缩短后带钢控冷工艺的需要。     

关于建筑学研究中的教学研究

之所以选择了这篇看似没有直接谈论设计教学的文章来作为这个建筑教育专栏的引子，是为了奠定一个讨论建筑设计教学问题的基本前提。前提之一是“大学”，前提之二是“研究”。脱离了这两个基本前提，我们便不能够在学术的层面上谈论设计教学。     

作为研究的设计教学及其对中国建筑教育发展的意义

设计教师的日常工作——设计教学——是不是可以被看作为一种学术研究的特殊方式?这个问题的解答取决于设计教学是不是具有发展设计观念和方法的潜能。我国建筑设计教学的发展在“布扎”之后正面临着一个教什么和怎么教的学术真空,其解决之道就在于从学术研究的角度来重新界定设计教学,把设计教学当作为设计研究的重要工具。     

Influence of Nano-Nd2O3 on Crystallization Mechanism of Fused Quartz

The isothermal crystallization kinetics of pure fused quartz of blank specimen N- 0 and specimen N- 3 in troduced with 3 mass% nano-Nd2O3 was researched by means of XRD and Avrami equation. The results show that crystallization mechanisms of fused quartz in two specimens are both heterogeneous nucleation type caused by surface structure defects,and the grain growth mode of two specimens are both two-dimensional growth ac companied by one-dimensional and three-dimensiona growths,specimen N- 3 has the higher degree of grain growth in one-dimensional and three-dimensional than specimen N- 0; introducing nano-Nd2O3 can obviously reduce the "active nucleation sites"of glass structure on the fused quartz particles surface,enhance the stability o glass structure,increase the activation energy of fused quartz crystallization from 874 k J · mol- 1to 1 270 k J·mol- 1,and decrease the crystallization rate of fused quartz obviously.     

一石二鸟——“教学即研究”及当今研究型大学中设计教师的角色转变

针对当今的研究型大学中设计教师正面临的二选一的事业发展困境,即要么继续追求设计的兴趣,要么转去自己并不擅长的学术研究,提出“一石二鸟”的发展策略,“一石”就是设计教学,即设计教师的本职工作,“二鸟”就是教学和研究,即大学对教师的基本要求.其关键是将设计工作室教学作为一种特殊的学术研究,即由设计教学引发的研究应该能够强化而不是削弱设计学科.这样的一种发展策略既挑战大学对学术研究的通常定义也非出自建筑学的传统,故需要仔细论证.     

Investigation on structure and dynamic property of liquid Pd-Cu-Ni-P alloys using ab initio molecular dynamics simulation

Based on the short-range order,it is found that the abundance of the P-centered P-transition-metal clusters are the common feature among the liquid Pd-Cu-Ni-P alloys,and hence this feature alone could not uncover the underlying mechanisms of the variation of glass forming ability among the liquid alloys.For the so called similar elements such as Cu and Ni,their behaviors are significantly different when interacting with Pd or P atoms.Cu has weak bonding with both Pd and P while Ni has very strong bonding with P but nearly no bonding with Pd.The different bonding characters thus underlie the phenomenon that in the best glass formers the ratio of the two similar elements often deviates from 1:1.Only if the parameters of chemical short-range order of Cu and Ni around P become closest to each other the best glass forming ability is reached.It is also illustrated that the calculated dynamic properties are very helpful to locate the composition of the best glass former.     

Hybrid CFD/FEM-BEM simulation of cabin aerodynamic noise for vehicles traveling at high speed

Flow passing a vehicle may lead to the increase of the cabin interior noise level through a variety of mechanisms. These mechanisms include vibrations caused by aerodynamic excitations and reradiation from the glass panels, exterior noise trans-mitted and leaked through door seals including gaps and glass edge, and transmission of airborne noise generated by the interaction of flow with body panels. It is of vital importance to predict both the flow fields and the acoustic sources around the ve-hicle to accurately assess the impact of wind induced noise inside the cabin. In the present study, an unstructured segregated finite volume model was used to calculate the flow fields in which a hexahedron grid is used to simplify the vehicle geometry.A large eddy simulation coupled with a wall function model was applied to predict the exterior transient flow fields. The mean flow quantities were thus calculated along the symmetry plane and the vehicle’s side windows. A coupled FEM/BEM method was used to compute the vehicle’s interior noise level. The total contribution of the interior noise level due to the body panels of the vehicle was subsequently analyzed.     

带有不确定性多智能体系统的分散自适应协调控制(英文)

This paper is concerned with the leader-following consensus problem of a group of au-tonomous agents with unknown parameters and unmodeled bounded additive disturbances. Under the assumption that the topology graph has symmetric weights, distributed adaptive controllers are proposed to guarantee that each agent can follow the leader in the presence of bounded disturbances. For the dynamics without disturbances, the proposed dynamic controller ensures that the states of all agents track the leader’s state, and the errors of parameters eventually converge to the compact set which can be made as small as desired by an appropriate choice of the design parameters.     

王维仁素描 一个在香港教书的建筑师

我和王维仁都是1994年到香港的大学任教,他在香港大学时我在香港中文大学。据说他也曾经申请了中大的职位，我们差点成为同事。认识王维仁本人之前,我先听说了一则关于他的轶事,虽未经他本人的确认,不过八成是确有其事。