A novel approach to fabricate porous alumina ceramics with excellent properties via pore-forming agent combined with sol impregnation technique

An innovative approach for fabricating porous alumina ceramics (PACs) with improved mechanical and thermal properties using walnut shell powders as pore-forming agent combined with alumina sol impregnation is reported in the present work. It is demonstrated that uniform distribution of spherical pores can be observed in as-prepared PACs by using above technical route. The decrease of walnut shell powder sizes significantly promotes the enhancement of crushing strength and reduction of thermal conductivity of the PACs. Meanwhile, the impregnated alumina sol is favoring for the formation of spherical micro-pores, then further improves their mechanical and thermal insulation performances. The lowest thermal conductivity and highest crushing strength of resulting sample reach 0.16?W/m?K and 29.2?MPa, respectively. This novel method offers new possibilities to fabricate high-quality PACs.     

Data quality and uncertainty assessment methodology for pavement LCA

In performing pavement life cycle assessment (LCA), users are facing various reports of energy intensity coefficient (EIC) of pavement materials which differ considerably among data sources and therefore alter the LCA results significantly. Instead of selecting a certain EIC without or of little explanation for the current pavement LCA practices, this study proposed a methodology to build probability density function (PDF) for EIC based on available data-set and their qualities. Each data was first evaluated about the data quality indicator (DQI) through data quality pedigree matrix and converted to PDF in modified Beta distribution form. Three weighting methods, the DQI one, coefficient of variation (COV) one and analytical hierarchy process (AHP) one, were developed to assign weightings for different data. Monte Carlo simulation was run with the weighted PDF of each data as input to obtain the ultimate PDF for EIC. A case study to estimate the bitumen’s EIC with eight data samples were performed using the proposed methodology. It is found (1): the estimates by the proposed methodology is of higher reliability (lower COV) compared to any single data due to utilisation of information of the overall data samples; (2) the AHP weighting method is most favoured despite the results of the three weighting methods are close; (3) the central estimates of bitumen’s EIC are between5.4~5.8 MJ/kg. The proposed methodology is helpful in aiding calculating EICs for pavement materials and capturing uncertainties in LCA results in a statistical sense.     

浪漫田园——无锡阳山田园生活示范区设计

<正>"田园生活示范区"项目是无锡阳山田园综合体Ⅰ期工程的启动项目,位于无锡市惠山区阳山镇,是国内首个田园综合体项目。项目规划总面积约为416.4hm2,于2013年4月初启动建设,计划于5年内全面完成。无锡阳山是"中国水蜜桃之乡",地处城乡经济结合最紧密的长三角地区。镇内拥有亿年火山、万亩桃园、千年古刹、百年书院,生态自然景观资源丰富,旅游度假产业方兴未艾。该田园综合体项目包括现代农业、文化旅游、生态社区3大板块。主要规划有农业     

集中式热回收空调机组在商务办公楼中的应用

结合工程实例,介绍了集中式热回收空调机组的组成、工作原理和特点,阐述了其在商务办公楼中的应用,包括系统控制、调试及现场质量控制等,达到了理想的效果。     

“模范与系列”——社会阶层的身份划分与城市住宅的趋同现象

人们对居住空间的需求原本应当是多样与个性化的。计划经济体制下的住房实物分配,曾经模糊了这种多样性,但如今,市场体制下的城市住宅却表现出另外一种形式的单调、乏味与趋同。本文从消费意识形态的角度出发,探讨了城市住宅相互模仿、跟风复制的动因,指出正是由于消费社会对住宅商品属性的过度关注而导致了住宅空间形态的趋同现象。     

引燃柴油量及喷射间隔对直喷天然气发动机排放的影响

为优化直喷天然气发动机的喷射策略,在一台六缸电控直喷天然气发动机上,用试验方法研究了引燃柴油量及柴油摘/天然气喷射间隔对发动机 HC、CO和 NO_x排放的影响。试验结果表明:喷射间隔一定时, HC排放随引燃柴油喷射量的增加而降低；在引燃柴油喷射量为 4.0 mg时, HC排放随喷射间隔的增加而增加；引燃柴油喷射量在 6.0～11.5 mg范围内, HC排放在喷射间隔从 0.5 ms变化到 1.1 ms时,变化较小；喷射间隔增加到 1.4 ms时, HC排放升高趋势明显。 CO排放随引燃柴油喷射量的变化规律为先降低后升高；在不同的柴油喷射量下增加喷射间隔, CO排放均降低。 NO_x排放随引燃柴油喷射量的增加先降低后升高；在喷射间隔为 0.5 ms时, NO_x排放相对较小,在喷射间隔为 1.4 ms时, NO_x排放最高。增加引燃柴油喷射量有利于 HC的减排,对 CO排放的影响较小,但会导致 NO_x排放的恶化；增加喷射间隔会促使 HC和 NO_x排放的升高,但 CO排放有所降低。     

Color changes,nitrite content,and rehydration capacity of edible bird's nest by advanced drying method

This article presents the authors’ first attempt to improve quality of edible bird’s nest through continuous and intermittent low-temperature drying (25 and 40°C) with infrared and ultraviolet C (UVC) treatments. The attributes of quality were compared in regard to quality of hot-air-dried samples at 70–90°C. Experimental results showed that a significant improvement in the quality of edible bird’s nest in terms of minimizing color changes and rehydration capacity using intermittent low-temperature drying with infrared and UVC drying profile. However, it was also found that any drying method has less significant effect on the nitrite content of edible bird’s nest.