PROGRESS IN STUDIES ON ICE ACCUMULATION IN RIVER BENDS

River ice is an important hydraulic element in temperate and polar environments and would affect hydrodynamic conditions of rivers through changes both in the boundary conditions and the thermal regime. The river bend has been reported as the common location for the initiation of ice jams because the water flow along a river bend is markedly affected by the channel curvature. In this article, the experimental studies about the ice accumulation in a river bend are reviewed. Based on experiments conducted so ...     

兰加拉学院图书馆及教学楼

项目地点:加拿大温哥华项目类型:院校公共项目开工日期:2005年6月该项目获2005年豪瑞可持续建筑大奖赛北美地区提名奖     

Thermodynamics of Ti in liquid steels and slags

Thermodynamics of Ti in liquid steels and slags was studied in order to establish a data base for the prediction of TiO_x and TiN formation in liquid steels.The interaction parameters between Ti and i（i = Cr,Ti,Al, Si,Ni,Mo,Nb,N,O） in liquid iron and the equilibrium constants for the formation of TiN and TiO_x in liquid iron were determined as a function of temperature.In view of high Ti yield during ladle treatment,thermodynamics of titanium oxides in ladle slags was studied as well.Activity coefficient and redox equilibrium of TiO_x in MgO saturated CaO-Al₂O₃ slag are also discussed by measuring the distribution ratio of Ti between slag and iron melts and the Ti³⁺/Ti⁴⁺ ratio in slag at 1 873 K.     

采暖系统使用水银温度计室温测试误差及校正

通过建立室温测试动态模型及仿真,得出必要的测试时间。模拟了外温、测试室温、窗墙比和真实室温之间关系并给出修正图。为提高测试精度,提出和模拟降低误差方法。     

一体化设计引领更多生态建筑的问世

一体化设计(IDP)是一种更加整体的生态建筑设计思路,早在1990年初在加拿大C-2000项目和新思路挑战赛中就曾提出。实践证明,它比设备投入有更高的产出效益。     

Effect of freezing on the rheological, chemical and colour properties of Serpa cheese

The effect of freezing on the properties of a raw ewes'-milk semi-soft cheese (Serpa cheese) was studied using small amplitude oscillatory (SAOS) and texture measurements, colour and chemical parameters. The freezing was introduced at three different stages of the ripening process (28, 35 and 42 days), and the cheeses were maintained frozen for 12 months. Cheeses were submitted to a slow or fast freezing method, and to different storage temperatures: -10 and -20°C (three replicates for each set conditions). Chemical data showed that only the proteolysis indicators exhibited differences between frozen and non-frozen samples; frozen samples showed higher values of NPN than the non-frozen samples, indicating that the freezing process did not prevent the secondary proteolysis of cheese. Frozen samples showed a significantly (P<0·05) stronger structure than the non-frozen, as indicated by hardness. However, the differences between the frozen and non-frozen samples were not significantly for storage modulus (G' 1Hz) and loss tangent (tan δ 1Hz) (P>0·05). Freezing affected mainly colour parameters: frozen samples were more luminous, and more yellow-green. The results allowed us to conclude that the damages caused by freezing to cheese properties could be minimized if this type of storage is introduced at the end of ripening (42 d) using a freezing temperature of -20°C.     

全球可再生能源政策纵览

导言 目前能源政策的"赛场"(playing field)是通过直接和间接补贴的方式,偏向传统能源的.化石燃料发电商不承担巨额的卫生保健及排放的环境成本,电力的真正成本即外部成本由社会总体承担.     

Modeling the flow curve of hot deformed austenite under industrial rolling conditions

A 0.02%C plain carbon steel and a 0.11%C Nb-modified steel were tested in compression in the austenite temperature range.The critical strains for the initiation of dynamic recrystallization were determined from the 41 stress-strain curves obtained,using the double differentiation method.The work hardening behavior up to the critical strain was analyzed with the aid of a dislocation density model and the work hardening parameters r and h were derived in this way.These parameters were used to model the aus...     

重庆科技服务大厦夜景照明设计(英文)

本文简要介绍了重庆市第一个LED城市夜景照明示范项目。设计充分利用了LED体积小、响应快、色彩丰富等特点,利用一套自主研发的LED灯光控制系统,对建筑外立面上不同型号、类型的LED光源进行精确的点对点控制,形成了可随季节、时间变化的大型夜景画面。通过LED灯具的排列,在立面上组合出一个巨大的LED广告屏幕,从而解决了在中国城市夜景照明项目建设中,政府行为和商业利益之间的平衡问题,使城市夜景投资不再是无回报的投资。此外,该项目全部采用重庆本地产LED产品,可产生1000种以上画面变化的控制系统也由本地合作伙伴研制开发,有力地带动了本地LED产业的发展。