上海嘉定新城低碳道路的构建

根据低碳城市建设需求与上海嘉定新城定位,针对嘉定新城道路,设计采用了温拌型排水性沥青路面、钢渣透水人行道、绿化储碳技术与灌溉节水技术,率先在嘉定新城的临泽路成功实施,构建了低碳道路,起到了较好的工程示范作用,下一步将在嘉定新城大面积推广应用。     

浅谈碳纤维布加固钢筋混凝土梁的新方法

简单介绍了碳纤维布加固钢筋混凝土梁的新方法,并论述了其发展状况和技术优势.     

新型固态胺二氧化碳吸收剂的制备及性能

采用丙烯酸酯类为单体,二乙烯苯为交联剂,悬浮聚合制备大孔交联共聚物基质,胺解制备了一种新型固态胺二氧化碳吸收剂一聚丙烯酰多乙烯多胺型树脂,研究了单体种类、功能基结构和含量、胺解条件等对树脂吸收二氧化碳性能的影响.模拟条件试验表明,该树脂吸收二氧化碳活性高,寿命长.     

Annual uptake of atmospheric CO2 by the Weddell Sea derived from a surface layer balance, including estimations of entrainment and new production

Data from two cruises, one in April/May 1996 and one in December/January 1993, covering the same wide area in the offshore Weddell Sea, were used to derive the annual extent of entrainment and the capacity of the biological pump. The former property was obtained with the help of dissolved oxygen data, whereas the latter was approximated with nutrients. Especially the data from April/May, representing the initial state of the winter surface layer, were crucial to assess the annual extent of these processes. The results were applied to our carbon dioxide data. The annual increase of the Total CO₂ (TCO₂) concentration in the surface layer due to vertical transport amounts to 16.3 μmol kg⁻¹. An entrainment rate of deep water in the surface layer amounting to 35±10 m yr⁻¹ was deduced. The compensating, biologically mediated TCO₂ reduction was calculated to be larger than the TCO₂ increase due to vertical transport. Since the balance of these two processes determines whether the Weddell Sea is a source or a sink of CO₂, this indicates that the Weddell Sea, albeit upwelling area, is definitely a sink for atmospheric CO₂ on an annual basis. This conclusion is further supported by contemplations that the biological drawdown of CO₂ in the Weddell Sea as a whole is probably underestimated by our calculations. The new production for the Weddell Sea on a per unit area basis was found to be much higher than that for the Antarctic Ocean, when the latter value is being obtained by traditional biological methods. On the other hand, the CO₂ uptake by the Weddell Sea on a per unit area basis is somewhat smaller than the CO₂ uptake by the world ocean.     

火灾受损桥梁检测评估与加固处理

介绍回弹 超声综合法在检测评定桥梁结构遭受火灾损伤中的应用。结合实例,给出应用碳纤维布补强技术对其加固处理的方法,并通过桥梁静载试验证实加固取得了很好的效果,其思路可为处理同类病害的桥梁提供有益的参考。     

复叠式CO2/NH3低温制冷系统热力学分析

复叠式制冷系统具有良好的应用前景,利用自然工质CO_2、NH_3做制冷剂使系统有着很大的优势;对影响复叠制冷循环性能系数的几个因素进行热力学分析,并指出此系统的特点。     

碳纤维加固混凝土梁抗弯性能的非线性有限元分析

对经碳纤维加固后的钢筋混凝土梁进行有限元非线性全过程数值模拟分析。成功地解决了有限元求解碳纤维加固混凝土梁非线性数值的收敛问题,阐述了非线性的行为。有限元计算的结果与试验结果具有较好的一致性,并对两者之间的误差所产生的原因进行了分析。结果表明,建立合理的有限元数值模型,并采用合理的求解策略,能很好的准确预测并模拟碳纤维布加固混凝土梁的抗弯性能,同时也为以后的数值研究工作奠定了基础。     

Evaluation of CO2 emissions from railway resurfacing maintenance activities

This paper is the world first to investigate the CO₂ impact of railway resurfacing in ballasted track bed maintenance. Railway resurfacing is an important routine maintenance activity that restores track geometry to ensure safety, reliability and utility of the asset. This study consisted of an extensive field data collection from resurfacing machineries (diesel-engine tamping machines, ballast regulators and ballast stabilisers) including travel distances, working distances, fuel consumption and construction methodologies. Fuel consumption was converted to a kg CO₂/m using the embodied energies of diesel. Analyses showed that tamping machines emitted the highest CO₂ emissions of the resurfacing machineries, followed by ballast regulators and ballast stabilisers respectively. Tamping machines processed 4.25 m of track per litre of diesel, ballast regulators processed 6.51 m of track per litre of diesel and ballast stabilisers processed 10.61 m of track per litre of diesel. The results were then compared to previous studies and a rigorous parametric study was carried out to consider long-term resurfacing CO₂ emissions on Australian railway track. The outcome of this study is unprecedented and it enables track engineers and construction managers to critically plan strategic rail maintenance and to develop environmental-friendly policies for track geometry and alignment restoration.     

CO2脱除机在白灵菇种植场所的应用研究

白灵菇是一种营养丰富的食用菌,目前在国内市场供不应求,而在其反季节种植过程中,存在着冷库内CO2浓度逐步升高,影响产量和形状的问题。为解决这些问题,介绍了新研制的一种新型的CO2脱除机,可以较好的控制反季种植中冷库内的CO2浓度。测试了冷库内不同生长阶段白灵菇产生的CO2浓度,考察了冷库内不同高度时的CO2浓度的梯度变化,以及在试验中后期冷库内CO2浓度的变化速度。提出了白灵菇反季节种植冷库中CO2脱除机的运行方式。     

碳纤维布在连拱隧道衬砌裂缝病害治理中的应用

延安至安塞高速公路墩山连拱隧道主体工程完工后,衬砌出现了不同程度的裂缝和渗漏水等病害,通过对衬砌裂缝特征、产生原因的分析,并根据裂缝的开裂程度与发展规律,采用碳纤维布对隧道衬砌裂缝进行了局部修复和整体加固补强。由于在施工过程中严格控制施工工艺和施工质量,达到了预期效果。通过碳纤维加固模拟和监测表明:衬砌裂缝得到了有效控制,支护受力处于安全状态,围岩稳定,碳纤维布加固效果显著。