增进城市地区生物多样性——以新加坡模式为例

自 1963 年以来,新加坡开展实施了绿化计划,并经历了从“花园城市”到“花园中的亲生态城市”的演变。为了在新加坡实现生物多样性保护,国家公园局制定了自然保护蓝图,重点介绍该规划实施的关键是利用技术创新。新加坡城市生物多样性指数是一种评价生物多样性成效的自我评估工具,已在全球范围内的多个城市得到应用。     

材料的重要性

《材料的重要性》是《景观设计理论》的一段节选。《景观设计理论》旨在不使用专业术语或其他领域假说的前提下,结合景观设计过程向学生介绍内在理论思想。《材料的重要性》是本书的五章之一。每一章针对特定理论,解释了其基础和来源,探讨了它对设计的重要性,列举了20—21世纪与其相关的设计案例,整理了该理论的辩论(尤其是有关现代和后现代思想),最后还有相关阅读材料清单和需要学生们思考的问题。本文分为如下3个部分：第一部分,物质性,介绍“辩证唯物主义”“媒介即信息”“物质实践”和“编码”等理论及其在设计中的运用;第二部分,通过“建构表达”“地貌代理人策略”“石材的面层”“材料的暗示”“人造,但不是伪造”等理论,介绍材料的真实性及其在设计中的运用;第三部分,复写理论及应用,包括“剩余物”“复写的展示性”“未来的复写”和“虚构的复写”等内容。     

1990年世界铀简述

1990年,早已陷入困境的铀工业由于美元贬值而进一步受到打击。生产者、消费者和国家库存继续在现货交易和长期销售两方面展开激烈争夺。有情况表明,一些铀矿已经停产。世界铀产量继续下降。西方国家铀产量下降了14.7％,从1989年的4041。58吨U_3O_8减少到1990年的3447.36吨。南非、加拿大、美国的铀产量都显著下降,而其它大多数国家相     

深海采矿技术的研究与开发

10年前,深海采矿已达到顶峰,受到全世界的极大关注。1978年春,首次以试验规模连续从太平洋底部采出锰结核。1979年5月,第一次在红海海底开采含金属的沉积物。同时,专家们预言:大规模的深海采矿将于80年代末期开始。该预言是错误的。     

一种亚临界水挤出法应力诱导硫化橡胶粉脱硫化反应的方法

由南京工业大学和南京强韧塑胶有限责任公司申请的专利(公开号CN 103073741A,公开日期2013-05-01)"一种亚临界水挤出法应力诱导硫化橡胶粉脱硫化反应的方法",提供了一种亚临界水挤出和高剪切应力复合诱导硫化橡胶粉脱硫化反应技术,即:将占反应物总质量0~30%的线形高分子材料、占反应物总质量65%~97%的废旧橡胶粉与占反应物总质量0.2%~5%的脱硫助剂相混合,混合物在具有亚临界水挤出反应条     

Real-time horizontality adjusting and control system of a large platform applied to satellite experiment

A type of satellite will be made an out space envi-ronmental simulation experiment in the space simulator(KM6)in the ultra-low temperature.The satellite’ssouth-north board adopts a network of an orthogonal hotpipe that has a length of2m and it must keep …     

Studies of stability of blade cascade suction surface boundary layer

Transition is an important factor affecting the flowloss in blade cascade. Estimated transition local andprediction complex flows is an important element in a-nalysis and performance evaluation of gas turbine en-gine components and ultimately in the desig…     

Study of CMOS integrated signal processing circuit in capacitive sensors

The sensors will be more miniature, more integrat-ed and more intelligent in the future. More functions,high performances and the reduction of the cost can beobtained and the SOC can be implemented by integra-ting the microstructure sensor and the surroun…     

Research on adsorption mechanism of wall climbing robots based on internally balanced theory

The internally balanced theory proposed by the Japanese researchers,solved the contradiction between adsorption ability and moving capability of the permanent magnetic adsorption mechanism.However,it still has some problems when applied to wall climbing robots.This paper analyzes and improves this theory,and the improved internally balanced theory satisfies the requirements of the adsorption mechanism significantly.Finally,a practical prototype is proposed based on this method,and both the analysis using ANSYS and the experiment results justify the design validity.     

Evaluation of the exploitation of nontraditional water resources—— Case study of Yantian District in Shenzhen

Yantian District in Shenzhen is a water deficient area. Water shortage has become a major obstacle to its further economic progress. Consequently, rational exploitation of nontraditional water resources(NWR)has been naturally adopted to increase local available water volume. The purpose of this paper is to analyse the exploitation of two kinds of NWR, namely wastewater reuse and seawater utilization, in Yantian District, and assess the contribution of each mode to deal with the water crisis. Two different nontraditional water supply systems respectively based on the reclaimed water and sea water were presented, and the effects of each system were evaluated in terms of technology, economy and environment. The result shows that both wastewater reclamation and reuse (WRR) and direct utilization of seawater (DUS) are of great importance to cope with the tight water resource situation in the district. The data indicate that the fresh water saved by WRR system and DUS system is 29 and 17 million m3/a respectively. Moreover, the BOD, COD, NH3-N and T-P reduced by the WRR system are 870, 2900, 725 and 87 t/a, respectively. Considering the integrated effectiveness, the development of WRR system, which is of specific significance to exploiting new water resource and save natural fresh water supplied from distant water diversion project, is the preferred methods used to solve the water shortage problem in Yantian District and recover the water environment as well as maintain the sustainable development of the city zone.