Management Plans for UK World Heritage Sites: Evolution, lessons and good practice

Since the mid 1990s Management Plans have been prepared for most UK World Heritage Sites. Such Plans are distinctive in the fully integrated approach they take to ensuring conservation for a variety of differing World Heritage Sites. Some Plans were prepared 'late' for World Heritage Sites already inscribed on the World Heritage List in the mid 1980s and others formed part of the nomination documents required by UNESCO. Many candidate or recently nominated sites include complex cultural landscapes and townscapes. The essential principle that underlies a good World Heritage Management Plan is that its policies and objectives for the future must be drawn from a proper understanding of the 'Outstanding Universal Value' of the site and the potential changes that might occur there. Based on the experience of preparing Management Plans for six UK World Heritage Sites over the last five years, this paper sets out the lessons learned and highlights the emergence of good practice in this field.     

上海世纪公园国际花卉区彩色沥青路面设计与施工

通过科研及上海世纪公园国际花卉区彩色沥青路面的应用 ,阐述其原材料性能及配合比设计、施工等要点 ,证明其性能达到同类产品的技术指标且价格适中 ,在市政建设中将具有广阔前景。     

城市人居环境建设中环境友好理念的引入

我国城市人居环境建设面临着人地关系紧张、城市生态环境的恶化、城市交通运输梗塞、城市文化消失等问题.应将环境友好理念引入城市人居环境规划、建设和管理中,并以此为基础,制定具体的工作内容和方法.     

建设部鼓励推广应用实用技术

前段时间,香港报纸刊载了几例工程技术应用实例,引起中央有关领导和建设部领导的重视。经有关专家分析论证,建设部相关部门决定今后采取相应措施和适当方法,鼓励内地有关单位和相关工程推广使用此类技术和产品。     

Diurnal variation of dissolved gaseous mercury (DGM) levels in a southern reservoir lake (Tennessee, USA) in relation to solar radiation

Variations of dissolved gaseous mercury (DGM) concentrations in a southern reservoir lake (Cane Creek Lake, Cookeville, TN, USA) in relation to solar radiation were investigated consecutively from June 2003 to May 2004. The daytime DGM levels in the lake exhibited a two-phase diurnal trend; the DGM concentrations rose in the morning, peaked around noontime and then fell in the afternoon through the evening; these trends followed the general pattern of diurnal solar radiation variations. The morning and afternoon phases appeared to be asymmetrical with the former relatively steep and the latter gradual. A variety of daytime DGM level variations other than the typical two-phase diurnal patterns were also observed. For the time spans studied, the daytime mean DGM concentrations of the lake ranged from 12 to 68 pg L(-1) (60-340 fM). The daytime mean DGM levels in the summertime (June, July, August) showed values above 30 pg L(-1) (150 fM) in most cases and a large number of peak DGM concentrations above 50 pg L(-1) (250 fM). The summer DGM levels in the lake appear to be comparable to those observed in the large northern lakes for the summertime. The daytime DGM levels in the lake were found to correlate with solar radiation to various degrees (cases of r values above 0.8: approximately 12% and approximately 18% of the total sampling days for correlation with global solar radiation and UVA radiation, respectively). Correlating trends are recognizable between the daytime mean DGM concentration and the corresponding mean global solar radiation (r = 0.66, p < 0.0005) and between the daytime mean DGM concentration and the corresponding mean UVA radiation (r = 0.62, p < 0.0005).     

Study on two operating conditions of a full-scale oxidation ditch for optimization of energy consumption and effluent quality by using CFD model

The operating condition of an oxidation ditch (OD) has significant impact on energy consumption and effluent quality of wastewater treatment plants (WWTPs). An experimentally validated numerical tool, based on computational fluid dynamics (CFD) model, was proposed to optimize the operating condition by considering two important factors: flow field and dissolved oxygen (DO) concentration profiles. The model is capable of predicting flow pattern and oxygen mass transfer characteristics in ODs equipped with surface aerators and submerged impellers. Performance demonstration and comparison of two operating conditions (existing and improved) were carried out in two full-scale Carrousel ODs at the Ping Dingshan WWTP in Henan, China. A moving wall model and a fan model were designed to simulate surface aerators and submerged impellers, respectively. Oxygen mass transfer in the ditch was predicted by using a unit analysis method. In aeration zones, the mass inlets representing the surface aerators were set as one source of DO. In the whole straight channel, the oxygen consumption was modeled by using modified BOD-DO model. The following results were obtained: (1) the CFD model characterized flow pattern and DO concentration profiles in the full-scale OD. The predicted flow field values were within 1.98 ± 4.28% difference from the actual measured values while the predicted DO concentration values were within −4.71 ± 4.15% of the measured ones, (2) a surface aerator should be relocated to around 15 m from the curve bend entrance to reduce energy loss caused by fierce collisions at the wall of the curve bend, and (3) DO concentration gradients in the OD under the improved operating condition were more favorable for occurrence of simultaneous nitrification and denitrification (SND).     

中房大厦建筑设计构思

中房大厦是集商场、百货公司、写字楼、地下两层车库为一体的,具有国际水平的综合性设施。其建筑设计包括功能组织、技术、经济、交通、环境、造型等诸多方面的内容,建筑师应综合广泛的专业知识与新技术,全面考虑,统一安排。本文主要叙述该大厦在环境布局、功能分区、立面造型等方面的建筑设计与构思。     

制冷系统的节能环保与安全问题的探讨

随着经济的发展和人们生活水平的提高,环境污染、能源供应紧张和食品安全等问题越来越引起世界各国人民的关注。制冷空调行业发展的趋势是节能、环保和安全。本文主要对蒸汽压缩式制冷系统运行与管理中的节能、环保和安全等问题进行探讨。     

某民航售票楼墙体裂缝事故的分析与处理

论述了一个具体的地基处理及基础加固实例。指出在处理此问题时，首先要搞清引起结构破坏的主要原因，然后据此采取设计及施工措施，才能使加固成功。     

阳离子对木质素减水剂性能影响研究（2）

研究了不同阳离了木质素磺酸盐对水泥浆凝结时间的影响。