美国历史遗产保护相关概念辨析

本文通过对欧美历史遗产保护领域最常用的两个“保护”,即“Preservation”和“Conservation”的概念进行辨析以及对美国历史保护“Historic Preservation”对象名词性和动词性的探讨,明确美国历史保护中“保护”（即“Preservation”）的概念。同时又通过对不同时期影响美国历史遗产保护之保护理念的著名保护思想进行阐述,以探求其“保护”概念的发展脉络,并通过列举美国历史遗产保护领域中常用且公认的保护干预手法,进一步将“保护”的概念具体化。通过对美国历史遗产保护概念进行解析,旨在为我国现阶段历史遗产保护,尤其为包括历史建筑在内的历史环境保护与再利用提供有益的启示。     

钢纤维活性粉末混凝土力学性能试验研究

通过对掺入钢纤维的活性粉末混凝土不同尺寸试件,以及在相同尺寸前提下有无掺入钢纤维的试件进行了抗压强度和抗折强度等力学性能试验研究,探讨了尺寸效应以及钢纤维对试件抗压、抗折强度的影响,在对掺入钢纤维混凝土试件进行弹性模量试验的基础上,得出其与抗压强度的关系。结果表明,尺寸效应对活性粉末混凝土的抗压强度影响较大,对抗折强度影响较小;而钢纤维的掺入能较大地提高活性粉末混凝土的抗折强度,改善其脆性大的性质。     

巧妙利用地形,营造宜人的休闲居住空间——以温州洞头某滨海山地项目规划设计为例

以温州洞头某滨海山地项目的规划设计方案为例,从总体布局、交通组织、景观营造、建筑设计等方面入手,对如何利用山地的特殊条件,在保护自然生态环境免受大破坏的前提下,创造宜人的居住空间进行探讨,供类似工程借鉴。     

超细水雾全尺寸灭火试验研究

采用超细水雾全淹没灭火装置在3m×3m×3m的全尺寸密闭空间内进行庚烷火灭火试验,从而验证超细水雾在较大密闭空间内灭庚烷火的适用性。试验采用200mL/min和500mL/min的超细水雾灭火装置同时施加超细水雾,试验火源分别使用40kW和120kW的庚烷火,产雾所用的水分别采用纯水和含碳酸氢钠的水溶液,通过四种不同工况验证超细水雾的灭火效果。试验结果表明,超细水雾可扑灭较大密闭空间内的庚烷火,NaHCO3能够显著增强超细水雾的灭火效果。     

装配式钢结构在高承台塔吊基础中的应用技术研究

软土地基中高承台塔吊的基础多数均以传统的钢筋混凝土承台形式出现。为了减少钢筋混凝土塔吊基础承台的施工及养护间歇时间,使塔吊提前投入使用的时间,同时避免拆除过程中的机械噪声现象,故在长风生态商务区社区服务中心工程中采取了装配式钢结构塔吊基础承台的形式,该承台能重复多次使用,具有较高的社会效益和经济效益。     

保护剂对混凝土耐久性影响研究

针对无机硅类、硅烷类和有机共聚物3类保护剂对混凝土耐久性的影响进行了研究。重点研究了混凝土涂刷保护剂后吸水率、抗Cl-渗透性能、抗碳化性能、耐污染性能指标的变化,通过以上4项指标综合评定混凝土保护剂对混凝土耐久性的影响。     

基于商业综合体中复合需求的动线策略研究

本文首先探讨综合体模式下的商业混合趋势及其对设计的影响．并归纳多样商业形态组合的一些基本特点,在分析CCDI三个正在实施的工程实例的基础上,提出三种能够产生更多富于设计价值的空间的动线连接策略。     

Design and manufacture of high-filling-efficiency microfluidic devices

In this study, we proposed an efficient method for mass production of high-filling-efficiency microfluidic devices. Precision machining was the main process of device fabrication. The commercially available SolidWorks software was adopted for structure design. Unigraphics software was then used to simulate the machining process. The simulated tooling file was then loaded into a CNC milling machine for mold production. The fabricated metal mold was used for pouring polydimethylsiloxane (PDMS) to obtain high-filling-efficiency microfluidic structures. Finally, plasma-assisted packaging was conducted to tightly bind the PDMS microfluidic structure to the glass substrate. Experimental results showed that the additional semicircular filling structure and expended fill-entry structure can efficiently enhance filling efficiency of the microchannel device. The incubation well array can be completely filled at a relatively short filling time. The proposed highly efficient filling microfluidic device possesses advantages, such as feasibility for mass production and cost effectiveness.     

Evaluation of grinding wheel loading phenomena by using acoustic emission signals

In the industrial manufacturing field, machining is a major process. Machining operations involve grinding, drilling, milling, turning, pressing, molding, and so on. Among these operations, grinding is the most precise and complicated process. The surface condition of the grinding wheel plays an important role in grinding performance, and the identification of grinding wheel loading phenomena during the grinding process is critical. Accordingly, this present study describes a measurement method based on the acoustic emission (AE) technique to characterize the loading phenomena of a Si₂O₃ grinding wheel for the grinding mass production process. The proposed measurement method combines the process-integrated measurement of AE signals, offline digital image processing, and surface roughness measurement of the ground workpieces for the evaluation of grinding wheel loading phenomena. The experimental results show that the proposed measurement method provides a quantitative index from the AE signals to evaluate the grinding wheel loading phenomena online for the grinding mass production process, and this quantitative index is determined via some experiments in advance in the same grinding environment to help the monitoring and controlling of the grinding process.     

Research on quality improvement of the cross section cut by abrasive water jet based on secondary cutting

A manufacturing system comprises production processes and building services, both of which are supplied by different energy carriers as well as raw materials and water. These resources interact according to complex relationships and are converted into products for sale and waste flows. Holistic resource accounting allows the analyst to consider the dynamic relationships between these components, including the strong interdependence between energy and water, which has been called the energy-water nexus. Exergy analysis is a method that accounts for mass and both the quantity and quality of energy, while allowing analysis on a common basis, and for this reason, it is used increasingly to analyse resource consumption in manufacturing systems; however, it has rarely been used to consider water flows alongside energy and material flows. The main contribution of this paper is the presentation of modelling water flows in terms of exergy in the context of sustainable manufacturing. Using this technique in combination with previously developed exergy-based methods, the result is a truly holistic resource accounting method for factories based on exergy analysis that incorporates water flows. The method is illustrated using a case study of a food factory in which a 4.1% reduction in resource use is shown to be possible by employing anaerobic digester in an effluent water treatment process. The benefits of this technology option would have been underestimated compared to the benefits of waste heat capture if an analysis based on mass and energy balances alone had been used. The scientific value of this paper is the demonstration of the relatively high exergy content of effluent flows, which should therefore be regarded as potentially valuable resources. The analytical method presented is therefore of value to a wide range of industries beyond the food industry.