土体热传导性能及其热导率模型研究

为研究不同土体的热传导特性变化规律,利用热探针测试了南京地区典型土体在不同含水量和干密度状态下的热阻系数,分析了含水量、干密度、饱和度以及矿物成分等因素对土体热阻系数的影响,研究了不同状态下土体热导率的预测模型,提出了适用于不同地区土体热阻系数估算的修正系数.结果表明:南京地区典型土体的热阻系数随含水量和干密度增加而减小,当含水量超过一定范围后,热阻系数趋于稳定;热阻系数与饱和度之间的关系表现出与其含水量之间相似的变化规律;土颗粒的热传导特性由其矿物成分决定,石英含量对土颗粒热传导特性有着显著影响;提出了可用于非饱和土热导率估算的修正归一化模型,该模型对于粗粒土具有较高的预测精度,细粒土则需考虑区域差别进行修正.     

微弧氧化增强镁合金钼酸盐转化膜层的制备

目的提高钼酸盐转化膜的耐腐蚀性能,制备微弧氧化增强的钼酸盐膜层。方法采用化学转化法和微弧氧化法在AZ91D镁合金表面制备钼酸盐转化膜、微弧氧化膜和微弧氧化增强的钼酸盐膜层,研究了膜层的电化学行为和腐蚀失重情况,利用SEM、EDS、XRD和激光共聚焦显微镜对膜层的表面形貌、元素组成、物相组成和粗糙度进行分析。结果 XRD分析表明,钼酸盐膜层经过微弧氧化处理后,所得膜层较微弧氧化膜层多出新相MoSi_2。钼酸盐转化膜层经过微弧氧化处理后,相比于微弧氧化膜层,表面变得平整光滑,孔洞微粒变小,粗糙度降低。钼酸盐转化膜经过微弧氧化处理后,在3.5%NaCl溶液中浸泡48 h,膜层失重最低。通过电化学测试,微弧氧化增强钼酸盐膜层的腐蚀电位较钼酸盐转化膜的腐蚀电位正移0.643 V,较微弧氧化膜的腐蚀电位正移0.419 V,腐蚀电流密度较钼酸盐转化膜降低了3个数量级,较微弧氧化膜降低了1个数量级。结论钼酸盐转化膜经过微弧氧化处理后,膜层的耐腐蚀性能优于钼酸盐转化膜和微弧氧化膜,使镁合金的应用前景有所提高。     

论建筑论文：“建筑理论的理论”之三

本文论述：１．写建筑论文的十个弊端；２．如何建构建筑论文，强调建筑论文的主题性和写作技巧、写作规范等方面。     

风机盘管送风均匀化改进方法

风机盘管迎面风速对制冷空调系统的换热非常重要,而迎面风速分布不均是引起风机盘管机组的换热效率降低、制冷量减少的重要原因。提高迎面风速的均匀性能可以提高系统的效率。针对这个问题,本文提出了改善迎面风速均匀化的方法。     

氯氧镁水泥的强度与组成之关系

本文通过强度测试和物相的XRD分析,讨论了氯氧镁水泥石的力学强度与其组成及堆聚结构的关系。结果表明:当水泥石具有以纤维状5相晶体为主,且存在适量的Mg(OH)_2或MgO的Ⅱ型结构时,其力学强度最高。此时水泥浆中MgO/MgCl_2克分子比为10左右,H_2O/MgCl_2克分子比等于或略大于13,在MgO/MgCl_2克分子比较小的水泥浆中,加入碱性填料可明显地提高水泥石的强度。     

Cause of flow distributor on flow uniformity in open waterway stream passage velocity comparisons

In an open waterway flow passage, the inclusion of flow distributor paves a way to understand the idea of flow uniformity of the water along the upstream side and prevents non-uniform flow of water besides the passage length as a function of flow rate. The interesting idea in the flow distributor is its length and porosity. The essential conditions that should be satisfied are: there should not be any turbulence and there should be a possibility of achieving uniform circumferential flow in the flow passage. The other critical issue is the accurate measurement of low velocity of water. In this paper, a propeller-turbine-type anemometer is specially designed, fabricated and calibrated to measure the local velocity of water in the range of 0.001–0.01 m/s. This paper signifies how the flow uniformity is achieved by varying the size and porosity of the flow distributor.     

浅谈如何快速编制施工组织设计

介绍了快速编制施工组织设计的全过程,从收集建设工程相关信息、用现代化工具快速编制施工设计等方面进行了论述,指出快速准确的编制施工组织设计是建筑企业取得较好经济效益的保证。     

Fermentation and elutriation of primary sludge: effect of SRT on process performance

A primary sludge fermentation-elutriation pilot plant was operated using in-line and side-stream schemes. The influence of solids retention time, recirculation sludge flow-rate and solids concentration on the fermentation-elutriation process performance has been assessed in this paper. The use of high elutriation flows (12% of influent flow) improved the volatile fatty acids (VFA) concentration in the effluent stream. Suspended solids removal efficiency decreased in the primary settler when the solids retention time (SRT) was increased from 4 to 8 days. Disintegration step during hydrolysis process was pointed out as the main reason for that decrease. Maximum VFA productions were achieved at SRT between 6 and 8 days at the highest elutriation flow tested for both configurations. Propionic, butyric and valeric volatile fatty acids percentage increased when total solids sludge concentrations above 23,000mgl(-1) were used. Hydrogen accumulation, causing acetogenic bacteria inhibition, was indicated as the reason for C(3)-C(5) fatty acids accumulation.     

乌鲁木齐市南山雾水的化学组成及对环境影响

采用静态雾水采集器,在距新疆乌鲁木齐市58 km的南山地区白杨沟海拔1922 m处,进行连续间隔采样,研究其化学成份、分析其成因及对南山原始植物林带的影响。结果表明南山白杨沟地区SO42-、NO3-、Cl-浓度 (717、122、265μmol/L)远高于较清洁的景洪、舟山、庐山等地的值。且五月SO42-、NO3-、Cl-浓度远高于3、4月的值,可认为南山白杨沟地区已开始受到人为污染,雾对其周围环境有害而无利。     

沥青混合料离析成因及控制

从沥青路面水损害破坏出发，指出沥青混合料的离析是造成水损害破坏的根本原因，分析造成离析及不均匀的原因，提出了防止离析及不均匀的技术措施。