GDMO模板到IDL接口的映射关系研究

用CORBA技术构建TMN中的被管对象的接口,可以加快实现异构环境下电信网的分布式管理。通过研究TMN中的GDMO模板和CORBA中的IDL接口,可以建立二者之间的映射规则。这种映射关系可以通过两层转换来实现。第一层转换是ASN.1到IDL语言之间的转换;第二层转换则是GDMO模板到IDL接口的转换。     

WHO《饮用水水质准则》第四版解读

对世界卫生组织《饮用水水质准则》第四版进行了介绍,着重与《生活饮用水卫生标准》(GB 5749—2006)进行比较。并就两个标准中一些水质指标的情况及限值大小分四类进行介绍和评述。讨论了新版准则对我国相关水质标准修订的借鉴意义。     

The philosophy behind EN15251: Indoor environmental criteria for design and calculation of energy performance of buildings

European Directive for Energy Performance of Buildings (EPBD) was approved in the beginning of 2003. The transition period is 3–6 years depending on the article. European Standardisation Organisation (CEN) has drafted several standards to help the member countries implementing the directive. One of these is the “indoor environmental input parameters for design and assessment of energy performance of buildings-addressing indoor air quality, thermal environment, lighting and acoustics”. The standard specifies design values of indoor environment, values to be used in energy calculations, and methods how to verify the specified indoor environment in the buildings. The standard includes methods for long-term evaluation of the indoor environment. The paper describes the philosophy and some of the principles used in the standard, and gives examples presented in the standard. A draft standard has been under the international review process and has now been finnally approved at the formal vote.     

Good clinical practice in orthokeratology.

Overnight orthokeratology is becoming more and more popular especially in the Asia-Pacific region where the treatment is primarily used for myopic control in young children. Risk of complications in contact lens wear increases during overnight wear and may further increase when the treatment is used on children. The aim of this paper is to provide a comprehensive guideline for practitioners to improve their orthokeratology practice and minimize unnecessary or preventable complications. The fundamental requirement for starting an orthokeratology practice is to have proper education in the area and to equip the practice appropriately. Overnight trial fitting is recommended to confirm the physiological response prior to commencement of the treatment. Practitioners should provide adequate information, both oral and written, to patients before and after the commencement of treatment to avoid any legal dilemmas and to improve patients' compliance. Costs for the treatment should be transparent and provision of an emergency contact number is a must. Patients should be regularly recalled for aftercare visits and all communication with patients should be properly documented. In this paper, patient selection and the clinical procedures were discussed and a standard of practice in orthokeratology proposed. We believe that the key to providing a safe orthokeratology practice is to continually update knowledge in the field, and to practice to the highest professional standards.     

CFD evaluation of hydrogen risk mitigation measures in a VVER-440/213 containment

In the PHARE project “Hydrogen Management for the VVER440/213” (HU2002/000-632-04-01), CFD (Computational Fluid Dynamics) calculations using GASFLOW, FLUENT and CFX were performed for the Paks NPP (Nuclear Power Plant), modelling a defined severe accident scenario which involves the release of hydrogen. The purpose of this work is to demonstrate that CFD codes can be used to model gas movement inside a containment during a severe accident. With growing experience in performing such analyses, the results encourage the use of CFD in assessing the risk of losing containment integrity as a result of hydrogen deflagrations. As an effective mitigation measure in such a situation, the implementation of catalytic recombiners is planned in the Paks NPP. In order to support these plans both unmitigated and recombiner-mitigated simulations were performed. These are described and selected results are compared. The codes CFX and FLUENT needed refinement to their models of wall and bulk steam condensation in order to be able to fully simulate the severe accident under consideration.Several CFD codes were used in parallel to model the same accident scenario in order to reduce uncertainties in the results.Previously it was considered impractical to use CFD codes to simulate a full containment subject to a severe accident extending over many hours. This was because of the expected prohibitive computing times and missing physical capabilities of the codes. This work demonstrates that, because of developments in the capabilities of CFD codes and improvements in computer power, these calculations have now become feasible.     

The Design Guidelines (DGLs), a knowledge-based system for industrial design developed accordingly to ISO-GPS (Geometrical Product Specifications) concepts

Product design and optimisation today involves so many fields of expertise, many of which are in rapid evolution, that it can be very difficult for the designer to manage them. This paper describes the development of the DGLs (Design Guidelines), a knowledge-based tool that could be of great help to designers and engineers in modifying their products to get compatibility with different manufacturing and verification technologies. The current release of the DGLs, heavily influenced by the adoption of some ISO-GPS (Geometrical Product Specification) concepts, has been validated using the Rapid Prototyping technique called FDM (Fluid Deposition Modelling) and the CMM (Coordinate Measuring Machine) verification technique.     

历史城区的保护规划——以国家历史文化名城中山市为例

历史城区是历史文化名城保护的重点,但是由于一些概念和制度上的缺陷,历史城区保护规划在地位、内容和作用等方面仍存在误区。该文以国家历史文化名城广东省中山市为例,阐述了历史城区保护规划的地位、作用和技术路线,以及基于保护的历史城区城市设计导则。     

中国地热能源开发的机遇与挑战

作为低碳新能源家族的一员,地热能源开发已经被提到国家应对气候变化和防治雾霾的议事日程.本文回顾了地热资源开发历史,分析了我国地热能源开发落后的原因,认为要切实改变当前的落后局面,不仅需要产业界克服工程技术方面的障碍,而且需要地热学界重新评估我国包括水热系统和干热岩在内的地热资源分布格局,更需要政府主管部门调整目前偏重西部边远地区而轻视能源需求旺盛的东部地区的地热能源开发指导方针.     

电网运行面临的几个关键问题研究

电网的快速发展和大容量发输变电设备的投运给电网运行带来了新的挑战,也给早期一些电力系统准则的相关运行规定带来了新的问题.针对电网运行方式安排,提出应以第一级电网安全稳定标准为依据,合理安排潮流极限;针对600MW机组接入电网电压等级,提出应在送端电网接入220 kV以上电压等级电网,在受端电网可接入220 kV电压等级...