对工程造价专业会计学课程教学的一点思考

会计学课程是工程造价专业的重要专业基础课,会计教学不可能脱离会计准则,脱离人才培养方案,现阶段全国的工程造价管理行业"复合型"人才稀缺。课堂教学在培养学生学习能力的同时应向学生传授系统的知识,不能增加学生再学习的成本。     

关于屋面工程设计施工中几个问题的思考

以某一综合楼上人保温屋面工程做法为例,从其构造层次设置、防水材料选择和屋面排水做法等方面阐述了当前我国屋面工程技术实践中和现行《屋面工程技术规范》相关内容存在的问题,提出了作者的看法和改进建议。     

双复式住宅开发与建设

文章通过对双复式住宅概念的阐述,以上海、天津等城市双复式住宅实例的分析,试图探寻应对市场新形势下的住宅模式。     

Dissolved organic compounds in reused process water for steam-assisted gravity drainage oil sands extraction

The in situ oil sands production method called steam-assisted gravity drainage (SAGD) reuses process wastewater following treatment. However, the treatment and reuse processes concentrate contaminants in the process water. To determine the concentration and dynamics of inorganic and organic contaminants, makeup water and process water from six process steps were sampled at a facility employing the SAGD process in Alberta, Canada. In the groundwater used for the makeup water, the total dissolved organic carbon (DOC) content was 4 mg/L. This significantly increased to 508 mg/L in the produced water, followed by a gradual increase with successive steps in subsequent water treatments. The concentrations and dynamics of DOC constituents in the process water determined by gas chromatography-mass spectrometry showed that in the produced water, volatile organic compounds (VOCs) such as acetone (33.1 mg/L) and 2-butanone (13.4 mg/L) predominated, and there were significant amounts of phenolic compounds (total 9.8 mg/L) and organic acids including naphthenic acids (NAs) corresponding to the formula C_nH_2n+ZO_X for combinations of n = 4 to 18, Z = 0 and −2, and X = 2 to 4 (53 mg/L) with trace amounts of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene and phenanthrene. No organic contaminants, except for saturated fatty acids, were detected in the groundwater. The concentration of DOC in the recycled water was 4.4-fold higher than that in the produced water. Likewise, the total concentrations of phenols and organic acids in the recycled water were 1.7- and 4.5-fold higher than in the produced water, whereas the total concentrations of VOCs and PAHs in the recycled water were reduced by over 80%, suggesting that phenols and organic acids are selectively concentrated in the process water treatment. This comprehensive chemical analysis thus identified organic constituents that were concentrated in the process water and which interfere with subsequent water treatments in the SAGD process.     

建筑中庭空间的类型设计

通过对中庭空间这种具有庭院空间特色的建筑内部空间的探讨,归纳出中庭空间表现及运用的几种类型,并对此进行扩展,说明其在现代建筑设计方面的重要作用。     

活化盐泥填充PVC/ACR复合材料在异型材中的应用研究

介绍活化盐泥填充PVC/ACR复合材料在生产异型材中的加工应用情况,探讨了活化盐泥对PVC的稳定机理,通过大量试验确定了最佳配比和生产工艺.与普通异型材相比,活化盐泥填充PVC/ACR物料的加工稳定性得到改善,型材的表面光洁度和力学性能得到提高.     

蠕变型热熔防水涂料在复合防水中的应用

论述了复合防水层对材料的要求及其成型方式。介绍了防水材料蠕变性的检测方法和蠕变型热熔防水涂料的性能特点,详细说明了蠕变型热熔防水涂料与卷材复合防水的设计与施工要求。     

外保温抗裂砂浆性能试验研究

采用单因素分析试验的方法,研究了粉煤灰、聚丙烯纤维和复合外加剂不同掺量对抗裂砂浆性能的影响。试验结果表明,随着粉煤灰、聚丙烯纤维掺量增加,抗裂砂浆的抗裂性明显改善,但粉煤灰的掺量过高或过低将使抗裂砂浆的抗压强度降低;复合外加剂的掺量过高或过低均会导致砂浆的干缩率、开裂指数增大。综合分析,抗裂砂浆最佳配合比为粉煤灰掺量40%,聚丙烯纤维掺量0.5%,复合外加剂掺量0.8%,水灰比0.7,灰砂比1∶3.5。     

轻钢龙骨复合墙体抗侧性能试验研究

通过对四片轻钢龙骨复合墙体在低周往复水平荷载作用下的试验,对轻钢龙骨复合墙体的抗侧性能进行了研究,分析了洞＇口,斜支撑、蒙皮对墙体抗侧力的影响,推荐了开洞复合墙体抗侧力影响系数的计算公式。研究表明,在考虑蒙皮作用下,轻钢龙骨复合墙体具有良好的抗侧性能,这种结构形式可以完全应用于多层住宅。     

新装修办公楼室内挥发性有机物的测试研究

为研究办公楼装修后室内挥发性有机物的释放特性,利用活性炭吸附采样与气相色谱分析相结合的方法,跟踪监测了天津市某办公楼四个典型房间的室内污染物浓度。得出了装修后室内污染物浓度的变化规律,即污染物浓度随时间推移而降低,其间可能会由于房间温度、相对湿度和气流组织的变化而出现短暂的起伏。