The effect of the EAAEAE insert on the property of human metallothionein-3

MT3 shows apparently different properties and function fromMT1 even though they have 70% sequence homology. Possibly thetwo inserts, Thr5 and a negatively charged hexapeptide at position-55in MT3, play important roles. A series of MT3 variants aroundthe EAAEAE hexapeptide have been prepared by site-directed mutagenesisand their properties and reactivity towards pH, EDTA and DTNBhave been studied. Our detailed studies revealed that the EAAEAEinsert is essential to the property of MT3. It is the hexapeptideinsert, to some extent, making the MT3     

气流粉碎技术在氢氧化铝生产中的应用

论述了氢氧化铝粉体填料的用途、应用现状及加工现状,该产品目前在供应与需求方面显现出的矛盾.针对此项问题阐述了选用气流粉碎磨生产氢氧化铝粉体材料的目的、意义,充分对比了气流粉碎磨和普通万能粉碎磨的SiO2%,Fe2O3%,Na2O%,+320%、附水等产品质量指标,产能和电单耗等消耗指标.气流粉碎技术在氢氧化铝粉体生产中应用之后,氢氧化铝粉体填料的质量得到了比较大的提高,创造了可观的经济效益;同时,生产能力有较大幅度提高,且设备自动化程度高,有效减轻了职工的劳动强度.     

Possibilities and problems with the use of models as a communication tool in water resource management

Politicians and policy-makers, as well as modellers, often nurses an expectation that model derived results is an objective source of information that can be used to support decisions. However, several prerequisites have to be dealt with in order to ensure that models can be used as legitimate and efficient tools in water resource management. Based on empirical material from recent studies on the use of models in stakeholder dialogues, mainly focusing on catchment nutrient transport, two central problems are identified: (a) Models are laden with choices and thus depend on assumptions and priorities of modellers. (b) There are several factors that influence ability and willingness of stakeholders (as information recovers) to criticize or accept results of the modelling exercise. Recognized factors likely to influence stakeholders' acceptance of model derived results include issues at stake, stakeholders' ability to criticize model derived information, and their trust in the institutions that have developed or applied the used models. Identified prerequisites for successful use of models in integrated water resource management include: consideration of user relevance, awareness of and preparedness to handle constraints linked to communication of model-based results, transparency of used models and data and of involved uncertainties, mutual respect between experts and stakeholders and between involved stakeholder groups, a robust institutional network, and sufficient time for dialogues. Development and use of strategies for participatory modelling, based on a continuous dialogue between experts and stakeholders is recommended as a way to facilitate that the prerequisites for a successful use of models in water resource management are fulfilled.     

An analytical study on the thermal characteristics of flat-plate and evacuated solar collectors

In this study, we highlighted differences in the standards used in performance tests of solar collectors. We analyzed testing results for different types of solar collectors to determine the effects of the collector area and mass flow rate, which were not necessarily consistent across all tests. Our analysis showed that the factor,F′ (τα), including collector efficiency factor (F′), could be correlated with the flow rate or area regardless of the collector type. Moreover, the collector loss coefficient (F′U _L ) per flow rate or area for an evacuated collector was less that of a flat-plate collector; this was also correlated with the flow rate or area, regardless of the type of evacuated collector. As a result of this analysis, we propose a modified heat loss coefficient that includes the effects of all parameters that can be considered in a performance test and show that this coefficient could better describe the thermal characteristics of various types of solar collectors.     

A Class of POCA Distributions For rapid fading variations

Polydorou and Capsalis [1] pioneered the concept of POCA distribution to study the statistical behavior of the fast fading characteristics in an indoor environment under the assumption of finite number of scatters. In this note, we derive a comprehensive class of formulas for the POCA distribution to help better statistical modeling of the fast fading characteristics. The calculations involve use of several special functions and their properties.     

后工业时代米兰单功能城区更新

在物化的形式上,解释米兰城市发展历史上的单功能城区的改造意义,并由此分析单功能城区更新的经验:单功能城区向混合居住模式的更新是发展方向;城区的功能重新定义对城区发展有重要意义;以新的建设为基础,发展城区自身的特色,做到城市在更新和特色之间的协调。     

基于EXTEND的排队规则仿真研究

排队系统是一种典型的离散事件动态系统,在不同的排队规则下会有不同的系统特性。通过仿真软件EXTEND对不同排队规则下的排队系统进行了建模及仿真。在分析仿真结果的基础上,探讨了不同排队规则下排队系统的内在规律。     

航天产品多源可靠性信息的收集与整理--建立可靠性信息数据库

航天产品可靠性信息的来源多样，可靠性信息的时间性、随机性、有价性、时效性和可追溯性等特征，决定了可靠性数据收集应满足真实性、连续性、完整性等基本要求。同时，对多源信息的收集应遵循先进行需求分析，再确定数据收集点并制定数据收集表格的程度进行。给出了信息的适用性准则和信息分类的三维模型。最后结合具体型号航天产品的可靠性工作的要求，给出了可靠性信息数据库系统的整体方案设计。