梁柱中预应力筋的功能及预应力施工要点

本文初步分析了预应力梁柱中的预应力筋功能,介绍了其相应的构造,并介绍了梁柱预应力施工中的技术要点。     

BIM技术在建筑工程成本控制中的应用

文章对BIM技术进行了简单介绍;分析了传统的工程成本管理中存在的问题;介绍了BIM技术在建筑工程成本控制中的具体应用,包括施工过程中的成本控制、施工中的成本核算以及工程竣工结算中的应用.     

虚拟仿真技术与建筑施工安全工程

随着计算机技术和信息技术的快速发展,仿真技术也得到了迅速的推动,并在高技术的发展中越显其重要作用。本文介绍了仿真技术的发展和形成,介绍了该技术在建筑施工中的应用,重点介绍了它在施工安全中的应用。     

Auto CAD R13在建筑给排水设计中的应用

本文介绍了AutoCADR13在建筑设计中的一些应用,首先介绍了AutoCADR13的基本绘图功能、基本设置、图形编缉功能、块功能与外部文件功能并粗略介绍了AutoCADR13在建筑给排水设计中的应用。     

HRM非金属矿超细立式磨的研究与开发

本文主要介绍了HRM非金属矿超细立式磨的设计及开发,文章中列举了设备设计过程中的一些关键点。介绍了磨机在实际生产中的使用情况。     

谈梁格法在桥梁检测中的应用

介绍了梁格法的计算原理和基本特点,总结了其在结构分析中的优势,简单介绍了桥梁检测的重点,并通过实际工程验证了梁格法在结构分析中的可靠性,体现出梁格法在桥梁检测中的实用性。     

弧形钢板副格在港珠澳大桥中的应用

本文主要介绍了弧形钢板副格在港主要大桥中的应用。首先介绍珠澳大桥工程,其次介绍了副格的概念及作用,再次介绍了副格在港珠澳大桥中的详细应用,主要讲解弧形钢板副格仓止水设计以及振动下沉、副格内回填等施工工艺。最后对弧形铜板副格在港珠澳大桥中的应用进行了总结,并对有待研究的问题进行展望。     

双轮铣深搅施工技术在富水卵石地层中的应用研究

本文介绍了双轮铣深搅施工技术在富水卵石地层中的应用,介绍了双轮铣成套设备,深搅施工技术原理以及施工中的技术要点和注意事项。     

AutoCAD扩展数据在地形图建库中的应用

通过分析了AutoCAD扩展数据的组织结构,介绍了AutoCAD扩展数据在地形图地物属性录入中的应用,并结合应用给出了有关程序代码,最后介绍了AutoCAD扩展数据转入GIS中的方法。     

奥宇模板在南水北调供水工程中的应用

介绍了奥宇模板在南水北调工程一渡槽中的应用情况,重点对模板的设计与施工进行了介绍,并介绍了应用效果。     

Alteration of arsenopyrite in soils under different vegetation covers

The weathering of arsenopyrite (FeAsS) has been monitored in soils using an in situ experimental approach. Arsenopyrite in nylon experimental bags was placed in individual horizons in soils in spruce (litter, horizons A, B, and C), beech (litter, horizons A, B, and C) and unforested (horizons A, B, and C) areas and left in contact with the soil for a period of 1 year. The individual areas on the ridge of the Krušné hory Mts., Czech Republic, had the same lithology, climatic and environmental conditions. Scorodite (FeAsO₄·2H₂O) was identified as a principal secondary mineral of arsenic (As) formed directly on the surface of the arsenopyrite. Scorodite was formed in all the areas in all soil horizons. The amount of scorodite formed decreased in the series beech, spruce and unforested areas. In forested areas, there was a larger amount of scorodite on arsenopyrites exposed in organic horizons (litter, A horizon). The greater rate of arsenopyrite alteration in organic horizons in the beech stand compared to spruce stand is probably a result of faster mineralization of organic material with resulting production of nitrate and better seepage conditions of soil in this area. Speciation of As determined using the sequential extraction technique demonstrated that As was bonded in the soils primarily in the residual fractions prior to the experiment. The As content in the mobile fractions increased in the organic horizon in the forested areas after the experiments.     

不同介质中MOV小电流特性的对比研究

氧化锌电阻片(MOV)常用于过电压保护,其小电流特性决定了它的工频稳定性。随着电力技术的发展,MOV被应用于变压器绕组内部和超导电力系统中,MOV的工作介质为变压器油和液氮。将MOV在空气和变压器油、空气和液氮(77K)中分别进行对比试验,通过小波变换对原始数据进行去噪,利用各次谐波法提取阻性电流进行对比分析,结果显示:MOV在变压器油中的阻性电流峰值大于空气中的值,MOV在液氮中的晶界电容、阻性电流峰值均小于空气中的值。表明MOV的小电流特性在空气中优于变压器油中,在液氮温区优于常温下。     

Cell phones for the spirits: ancestor worship and ritual economies in vietnam and its diasporas

Religion has been thriving in the Socialist Republic of Vietnam since ??i m?i, the onset of market reforms in the late 1980s. Votive paper offerings, part of spiritual and economic well-being, play a crucial role in performing religious practices in the socialist country as well as among diasporic Vietnamese. In urban Hanoi, material objects made from paper are traded in marketplaces and later burned in the streets, in temples and pagodas, in private yards and other places on special occasions in order to be transmitted to the ancestors. In the past few years, the range of votive paper offerings produced, traded, and sent to the deceased has expanded to include new forms and references to new media. Drawing on recent debates in the role of media in religion and in particular on technologies of mediation, I focus on the use of votive paper offerings in the sociocultural context of the Vietnamese spirit world. I explore how new media and media technologies are embedded in multilayered processes of mediation in Vietnam and its diasporas. Taking religious practices of burning votive paper offerings as an ethnographic example, this essay aims to contribute to ongoing debates on popular religion and the sacred life of material goods in late socialist Vietnam, on its transnational ties, and on the entanglements between religion, media and materiality.     

探究“虚实”空间关系，创造个性化的城市空间场所

作者利用空间的“虚、实”概念,结合格斯塔心理学的“图底”关系,类比分析中国水墨画的留白艺术手法及生态系统中的细胞繁衍规律,通过张家界城市绿化广场周边地段的概念设计的创作实践,提出创造个性化的城市空间场所工作中虚实空间的理念与原则目标。     

图绘对于空间的再书写--以镜清斋(静心斋)图档解读为例

18世纪中国皇家园林营造不仅留下大量珍贵实例,亦有丰富图档资料传世。针对图绘与真实空间之间的多重结构性关联,选择绘制于1669年的《皇城宫殿衙署图》、1750年的《京城全图》、1759年的《西苑太液池地盘图》、1874年的《北海镜清斋添盖房屋地盘细底》与1936年的《北海静心斋平面及剖面图》5幅镜清斋(静心斋)图纸进行对比研究。在信息层面,对镜清斋(静心斋)及其周边场地的山水关系、建筑布局,以及单体尺寸进行历时性的整理与比较;在图像层面,通过解读绘图技法、图像变形、标注等制图痕迹,还原不同时期的绘图者对于同一场地的差异性认知。指出不同技术语境下图绘差异背后所隐含的是图绘的功能、绘图者身份乃至整体知识结构的转变,并通过图绘对比更细致地解读镜清斋(静心斋)的空间设计。     

杭州亚运村综合管廊兼顾人防设计方法研究

在我国当前大规模城市基础设施建设进程中,为提高城市生命线工程的防护性能,降低战时破坏带来的不利影响,对于综合管廊兼顾人防设计的需求逐渐提上议事日程。本文首先系统回顾了我国在该领域内的理论研究历程及工程实践现状,对综合管廊工程兼顾人防设计的理论要点做了全面分析总结,归纳了全套设计方法;其次以杭州亚运村片区综合管廊防护设计为例,侧重于片区管廊防护单元的总体布局特点,介绍了按浙江省人防标准进行防护设计的方法和思路,详细分析各专业防护设计方法及技术措施;最后基于前述内容,提炼了该领域内关键技术问题,并对技术标准及相关技术措施提出了建议。本文提出的设计思路方法以及工程实例,可供目前国内类似工程规划设计借鉴参考。     

The study of terrestrial vertebrates of the Ob River basin

The paper describes the 300-year history of studying the terrestrial vertebrates in the Ob basin and the current state of researches into amphibians, reptiles, birds and mammals. We examine the role of the research centres in Western Siberia in studying the terrestrial vertebrates in the Ob basin, from the steppe in the south to the tundra in the north and the uplands of the Altai, Kuznetsky Alatau and Salair. We describe the degree of exploration of the terrestrial vertebrates in 11 Russian regions located in the area. The paper includes discussions of rare species, population, spatial distribution and man’s impact on the animals. We also indicate areas where there is insufficient study.     

Trace metal behaviour in estuarine and riverine floodplain soils and sediments: a review

This paper reviews the factors affecting trace metal behaviour in estuarine and riverine floodplain soils and sediments. Spatial occurrence of processes affecting metal mobility and availability in floodplains are largely determined by the topography. At the oxic-anoxic interface and in the anoxic layers of floodplain soils, especially redox-sensitive processes occur, which mainly result in the inclusion of metals in precipitates or the dissolution of metal-containing precipitates. Kinetics of these processes are of great importance for these soils as the location of the oxic-anoxic interface is subject to change due to fluctuating water table levels. Other important processes and factors affecting metal mobility in floodplain soils are adsorption/desorption processes, salinity, the presence of organic matter, sulphur and carbonates, pH and plant growth. Many authors report highly significant correlations between cation exchange capacity, clay or organic matter contents and metal contents in floodplain soils. Iron and manganese (hydr)oxides were found to be the main carriers for Cd, Zn and Ni under oxic conditions, whereas the organic fraction was most important for Cu. The mobility and availability of metals in a floodplain soil can be significantly reduced by the formation of metal sulphide precipitates under anoxic conditions. Ascending salinity in the flood water promotes metal desorption from the floodplain soil in the absence of sulphides, hence increases total metal concentrations in the water column. The net effect of the presence of organic matter can either be a decrease or an increase in metal mobility, whereas the presence of carbonates in calcareous floodplain soils or sediments constitutes an effective buffer against a pH decrease. Moreover, carbonates may also directly precipitate metals. Plants can affect the metal mobility in floodplain soils by oxidising their rhizosphere, taking up metals, excreting exudates and stimulating the activity of microbial symbionts in the rhizosphere.     

Antagonistic Action of Fe and Mn in Mediterranean-Type Plants Irrigated with Wastewater Effluents Following Biological Treatment

The present study examined the ability of certain Mediterranean plants to absorb Mn ++ when irrigated with wastewater effluents following treatment, the relative absorption of Fe ++ and Mn ++ , as well as the endurance of such plants to high Mn ++ concentrations in the water used for their irrigation. The experimental plants used in the study were Olea europaea , Nerium oleander and Geranium sp . These plants were irrigated with secondary treatment wastewater effluents, with water commonly used for irrigation in the area, and with water enriched with high concentrations of Mn ++ . The results showed that irrigation of the plants with wastewater treatment effluents resulted in slightly elevated concentrations of Mn ++ and Fe ++ in the leaves, the roots, and in the soil. On the contrary, irrigation with water enriched with high concentrations of Mn ++ (as high as 1000 mg/L) resulted in correspondingly high Mn ++ concentrations in the plants under study. The accumulation of Mn ++ was much higher in the roots than in the leaves of these plants. In the case of Mn ++ enriched water irrigation, the corresponding concentrations of Fe ++ in the roots, in the leaves, and in the soil indicated the existence of strong antagonism between these two elements. All plants exhibited tolerance to high concentrations of Mn ++ .     

冬季空调不加湿对室内参数的影响

基于质量守恒方程导出了冬季空调系统不加湿时房间内的含湿量计算式,综合考虑影响室内含湿量的主要因素,得出冬季空调可以不加湿时应满足的条件,考察了中国典型气候区代表性空调房间冬季空调不加湿时室内相对湿度能否满足设计要求。研究表明:中国各地区的商场,夏热冬冷地区的餐厅及三星级及以下酒店多功能厅,夏热冬暖地区的影剧院、办公室、酒店客房及多功能厅、餐厅,温和地区的办公室、三星级及以下酒店客房、酒店多功能厅及餐厅空调系统不加湿即可达到设计湿度要求;严寒地区及寒冷地区的影剧院、办公室、酒店客房、酒店多功能厅及餐厅,夏热冬冷地区的影剧院、办公室、酒店客房、四星级及以上酒店多功能厅以及温和地区的影剧院、四星级及以上酒店客房等房间的空调系统必须加湿才能达到设计要求。