“间”的呈现 上海新时达电器有限公司新厂区建筑的解读

文章将“间”的传统理解作为解读仙田满新作——上海新时达电器有限公司新厂区的一个视角。从“间”引申出对时间有无的处理、尺度变化的过渡以及外部环境的介入等,作为建筑空间构成组合的新契机。“间”的呈现使空间的场所感得到强化。     

面向实施的历史街区规划设计-以广州市大小马站书院群保护与更新规划为例

传统的保护规划重在确定保护对象、制定保护措施,但对影响历史街区传统风貌的外部性开发缺乏控制与指导,导致规划虽制定完成,但破坏传统风貌的开发行为仍在继续;同时规划成果与现实发展脱节,缺乏可实施性。广州市大小马站书院群保护与更新规划结合一些理论研究,落实了深度现状调研、寻求并协调各方利益诉求、利益的合理再分配三方面的重点内容,解决了保护与改善民生的问题,对不合理的开发也真正给予了控制,并与开发者达成了一致意见,提高了旧城中心区历史街区保护的科学性与可实施性。     

Modal parameter identification of Tsing Ma suspension bridge under Typhoon Victor: EMD-HT method

This paper aims to identify the natural frequencies and modal damping ratios of the Tsing Ma suspension bridge during Typhoon Victor using the newly emerged empirical mode decomposition (EMD) method in conjunction with the Hilbert-transform (HT) technique. Stationary tests on the acceleration responses of the bridge recorded at different locations and in different directions during Typhoon Victor are first carried out to classify the recorded response data. Natural frequencies and modal damping ratios identified by the EMD-HT method are then compared with those obtained by the traditional fast Fourier transform (FFT)-based method. The modal parameters identified by the EMD-HT method from the bridge responses recorded at different locations are compared with each other to check their consistency. Furthermore, the variations of natural frequency and total modal damping ratio with vibration amplitude and mean wind speed are examined. The results demonstrated that the EMD-HT method is applicable to modal parameter identification of large civil structures under typhoons. The EMD-HT method and the FFT-based method produced almost the same natural frequencies but the FFT-based method gave higher modal damping ratios than the EMD-HT method in general.     

钟祥文风塔建造艺术

该文通过对文风塔现状勘察测绘．简述覆钵式塔的发展演变，文风塔独特的建筑风格、优美的建筑造型，体现了文风塔精湛的建造艺术。中国佛塔建筑的传统特色，反映出我国古代劳动人民无穷的聪明才智．     

特高含水期马20断块剩余油分布的数值模拟

兴隆台油田马20断块兴隆台层组构造复杂,开发历史长,作业措施频繁,已进入特高含水开发阶段,剩余油分布状况异常复杂.为解决此难点,采取了优选主力目标层,精细储量复算,优化网格,建立精细地质模型,岩石流体物性控制,精细动态数据控制,精细历史拟合等数值模拟研究技术措施,建立了各小层砂体剩余油饱和度等值图,定量分析了平面、纵向的水淹状况和剩余油分布规律,探索出针对特高含水期老油田不同剩余油潜力区分布特点进行可行性挖潜对策调整模式.     

Preparation of location-specific thin foils from Fe–3% Si bi- and tri-crystals for examination in a FEG-STEM

Bi-crystals and tri-crystals of a nominal Fe–3% Si (wt%) of well-defined orientations have been grown using a floating-zone technique with optical heating. The manufacture of these unique crystals and the preparation technique involved in harvesting thin foils from specific locations for transmission electron microscopy are described in detail. In particular, the grain boundary triple junction has been extracted from the tri-crystal and examined in high-resolution aberration-corrected FEG-STEM instruments. To achieve the necessary resolution, the foils have to be uniformly thin, in the range 50–100 nm over large areas of the specimen. For ferromagnetic materials, there are further challenges arising from the magnetic field interaction, with the electron beam placing significant demands on the aberration correction system. One way to minimise this interaction is to reduce the total mass of magnetic material. To achieve this, an in situ focused ion beam lift-out technique has been combined with an additional precision ion-polishing stage to reproducibly provide thin-foil specimens suitable for high-resolution EELS and EDX analysis. Examination of the foils reveals that the final precision ion-polishing stage removes residual damage arising from the use of focused ion beam milling procedures.     

Three-dimensional spectral element simulations of variable density and viscosity, miscible displacements in a capillary tube

A high-accuracy numerical approach is introduced for three-dimensional, time-dependent simulations of variable density and viscosity, miscible flows in a circular tube. Towards this end, the conservation equations are treated in cylindrical coordinates. The spatial discretization is based on a mixed spectral element/Fourier spectral scheme, with careful treatment of the singularity at the axis. For the temporal discretization, an efficient semi-implicit method is applied to the variable viscosity momentum equation. This approach results in a constant coefficient Helmholtz equation, which is solved by a fast diagonalization method. Numerical validation data are presented, and simulations are conducted for the three-dimensionally evolving instability resulting from an unstable density stratification in a vertical tube. Some preliminary comparisons with corresponding experiments are undertaken.     

小断面长距离水工隧洞施工通风的设计与布置

针对小断面长距离的马桑林隧洞的通风排烟问题,通过理论计算,并在施工前期安排重要条件与之类似的石岗山支洞作为生产性试验洞段,最终得出切合实际的设计方案用于施工,效果良好。     

Study by EELS of helium bubbles in a martensitic steel

This work presents measurements of the helium density and pressure in small bubbles in a martensitic steel, which is a vital first step towards identifying their role in the microstructural mechanisms determining the macroscopic properties of the material. Electron Energy-Loss Spectroscopy in the Scanning Transmission Electron Microscope has been used to analyse individual bubbles. The energy shift of the 1s → 2p transition and the helium density have been measured for each bubble analysed. The pressure inside the bubbles has been calculated from the helium density using an equation of state. In these bubbles, the values for the helium pressure seem to be smaller than the equilibrium pressure, and agree in trend with the findings of previous studies, although our results extend to smaller radii and higher pressures.     

检波器连接方式的选择

本介绍了一种根据已有资料正确选择检波器连接方式的方法，并在得出检波器输出与固有频率及衰减系数的关系的同时指出：连接后的检波器的总阻抗过大或过小，都会影响检波器的灵敏度，还会降低地震记录的分辨率。中所设计的组合检波系统具有较合理的高输出和低阻抗。实际算例也表明，该方法简便易行，能保证信号最大限度地输出。