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期刊论文 9

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2023 1

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2012 1

2011 4

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井塔冬期快速施工成套技术 1

井帮位移 1

人工冻融土 1

全方位 1

冬期 1

冷冻萃取 1

冻存 1

冻结加固 1

冻结壁厚度 1

复杂地质条件 1

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快速解冻 1

扩增 1

掘砌段高 1

机械性能 1

灌装 1

盾构进出洞 1

真空干燥 1

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Frost heave and freezing processes of saturated rock with an open crack under different freezing conditions

Zhitao LV, Caichu XIA, Yuesong WANG, Ziliang LIN

《结构与土木工程前沿（英文）》 2020年第14卷第4期页码 947-960 doi: 10.1007/s11709-020-0638-z

摘要： Frost heave experiments on saturated sandstone and tuff with an open crack are conducted under uniform and unidirectional freezing conditions. Frost heave of crack in sandstone with high permeability is more significant under uniform freezing condition than that under unidirectional freezing condition. However, frost heave of crack in tuff with low permeability is more significant under unidirectional freezing condition. To illustrate the reasons for this phenomenon, a numerical model on the freezing processes of saturated rock with an open crack considering the latent heat of pore water and water in crack is proposed and confirmed to be reliable. Numerical results show that a frozen shell that blocks the migration of water in crack to rock develops first in the outer part of the rock before the freezing of water in crack under uniform freezing condition. However, the migration path of water in crack to the unfrozen rock under freezing front exists under unidirectional freezing condition. The freezing process and permeability of rock together determine the migration of water in crack and lead to the different frost heave modes of crack for various permeable rocks under different freezing conditions. The frost heave modes of crack in rock with low or high permeability are similar under uniform freezing condition because water migration is blocked by a frozen shell and is irrelevant to rock permeability. For high permeability rock, the frost heave of crack will be weakened due to water migration under unidirectional freezing condition; however, the frost heave of crack would be more significant for low permeability rock because water migration is blocked under unidirectional freezing condition. Therefore, the freezing condition and rock permeability determine the frost heave of rock with crack together, and this should be concerned in cold regions engineering applications.

关键词： frost heave rock with crack freezing process freezing condition frost heave mode

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Blockchain-based smart contract for smart payment in construction: A focus on the payment freezing and

《工程管理前沿（英文）》 2022年第9卷第2期页码 177-195 doi: 10.1007/s42524-021-0184-y

摘要： Late payment, and indeed no payment, is a rampant and chronic problem that has plagued the global construction industry for too long. Recent development in blockchain technology, particularly its smart contract, seems to provide a new opportunity to improve this old problem. However, this opportunity is largely unexploited. This study aims to develop a blockchain-based smart contract (BBSC) system for smart payment in the construction industry by focusing on the fundamental cycle of payment freezing (sometimes also synonymously called payment guarantees) and disbursement application. Firstly, a BBSC framework, containing three processes of (a) initiation and configuration, (b) payment freezing, and (c) disbursement application, is developed. Next, based on the framework, the system architecture of the BBSC system, containing three layers of (1) Infrastructure as a Service (IaaS), (2) Blockchain as a Service (BaaS), and (3) Software as a Service (SaaS) is proposed and elaborated. Finally, based on the system architecture, a BBSC prototype system is developed using a real-life modular construction project as a case study. It was found that the prototype system can improve the certainty and efficiency of the progress payment, thereby enabling smart payment in construction transactions. Without advocating radical changes (e.g., the contractual relationships or the intermediate role of banks in modern construction projects), the prototype can be developed into a real-life BBSC system that can work compatibly with current advancements in the field. Future works are recommended to fine-tune the findings and translate and implement them in real-life applications.

关键词： blockchain construction project smart contract smart payment payment dispute

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A two-stage deep freezing chemisorption cycle driven by low-temperature heat source

Yuanyang HU, Liwei WANG, Lu XU, Ruzhu WANG, Jeremiah KIPLAGAT, Jian WANG

《能源前沿（英文）》 2011年第5卷第3期页码 263-269 doi: 10.1007/s11708-011-0152-z

摘要： A two-stage chemisorption cycle suitable for deep-freezing application driven by low- temperature heat source was proposed. Through two-stage desorption processes, the two-stage cycle can break through the limitations of the heating temperature and ambient cooling temperature. The two-stage cycle based on CaCl /BaCl -NH working pair can utilize the heat source with a temperature of above 75°C, and simultaneously realize deep-freezing all the year round. Experimental results and performance prediction show that the adsorption quantity of calcium, theoretical coefficient of performance (COP) and optimized specific cooling power (SCP) of the CaCl /BaCl -NH chemisorption system are 0.489 kg/kg (salt), 0.24 and 120.7 W/kg, when the heating temperature, ambient cooling temperature, pseudo-evaporating temperature and mass ratio of reacting salt and expanded graphite are 85, 30, -20, and 4∶1, respectively.

关键词： adsorption freezing desorption heat source

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盾构进出洞全方位风险控制冻结加固技术

嵇彭

《中国工程科学》 2012年第14卷第2期页码 90-95

摘要：

在含水复杂的地质条件下采用水平冻结法进行盾构进出洞施工，可以通过延长（加深）水平冻结外圈冻结深度，使冻结加固体全方位包裹并超过盾构机本体，利用外圈冻结孔的维护冻结，将盾构推进过程中形成的微小流水通道中的泥土冻结成为冻土，封闭流水通道，较为有效地防止了流水、涌砂现象的发生。利用长距离水平钻孔防喷接驳器，简单方便地解决了在已施工完毕的端头井内长距离钻孔的难题。工程实践证明，全方位风险控制冻结加固技术在复杂地质条件下盾构进出洞施工中，简单易行，安全可靠，值得推广应用。

关键词：复杂地质条件盾构进出洞全方位风险控制冻结加固

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Caloric evaporation of the brine in Zangnan Salt Lake

Shiqiang WANG, Yafei GUO, Nan ZHANG, Lingzhong BU, Tianlong DENG, Mianping ZHENG

《化学科学与工程前沿（英文）》 2011年第5卷第3期页码 343-348 doi: 10.1007/s11705-010-1029-0

摘要： Zangnan Salt Lake on the south of the Tibet is a type of carbonate lake with high concentrations of lithium, boron, and potassium and obviously it differs from seawater in its chemical composition. An experimental simulation of the caloric evaporation of the lake’s brine was conducted by first freezing the brine and then performing isothermal evaporation at 288.15 K. The freezing path and the physicochemical properties of the brine were determined. The crystallization sequence was natron, hydrohalite, halite, sylvite, zabuyelite, trona, aphthitalite, thermonatrite, and borax. Rubidium and cesium salts did not crystallized out but concentrated in the mother solution. The physicochemical properties (density, refractive index, conductivity, and pH) of the liquid phase changed as the evaporation progressed. In the beginning of the evaporation processes, the concentration of potassium ions in the liquid phase gradually increased but later it decreased. A peak value of 55.21 g/L was obtained when the evaporation was 88% complete. When the mineral aphthitalite began to crystallize; the concentrations of B O , Li , Rb , and Cs gradually increased as the evaporation progressed. When the evaporation was 98% complete, their concentrations in the mother liquor were 40.77 g/L, 4.838 g/L, 400.17 mg/L and 31.95 mg/L, respectively. This essential fundamental study can provide an important reference for the comprehensive utilization of brines in Zangnan Salt Lake.

关键词： Zangnan Salt Lake evaporation crystallization path freezing

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人类诱导性多能干细胞稳定生产的最新进展 Review

Ikki Horiguchi, Masahiro Kino-oka

《工程（英文）》 2021年第7卷第2期页码 144-152 doi: 10.1016/j.eng.2021.01.001

摘要：

诱导性多能干细胞（iPSC）在许多方面，如再生医学和药物筛选方面，是理想的细胞来源，其开发前景广阔。但是，目前还没有一种有效的大规模生产系统来确保诱导性多能干细胞的稳定供应。本文综述了近年来为了实现诱导性多能干细胞的稳定生产所采取的方法。本文首先讨论了诱导性多能干细胞培养过程中需要控制的因素，如养分供应、废物清除和氧气供应。然后，介绍了基于黏附、悬浮和支架的诱导性多能干细胞培养系统的最新研究。本文还讨论了细胞培养阶段之后进行的过程，如灌装和冻存过程，由于细胞悬浮液在超低温保存培养基中存活率降低，所以其生产规模受到了限制。最后，我们总结了实现诱导性多能干细胞稳定生产的可能性，并强调了仍有待克服的局限性。本文表明为了获得最佳且稳定的大规模生产诱导性多能干细胞系统，运用多学科研究手段对研究影响细胞生长和质量的复杂因素是至关重要的。

关键词：诱导性多能干细胞细胞生产扩增灌装冻存

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深表土冻结壁变形规律

郭永富

《中国工程科学》 2011年第13卷第11期页码 81-88

摘要：

利用ANSYS软件建立数学模型，分析不同地压、不同冻结壁厚度、不同冻结壁平均温度、不同开挖段高与冻结壁变形之间的关系。通过研究发现,井帮位移随冻结壁平均温度的降低、冻结壁厚度的增大而减小，随施工段高增大、地层地压值的增大而增大，且地压值的变化对冻结壁的变形影响最为显著。据此提出了深表土冻结壁应按变形条件进行设计，且施工段高是影响冻结壁稳定性的极为重要的参数，在施工中应严格控制。研究提出当冻结壁厚度为10 m左右，平均温度达到－20 ℃时，采取降低冻结壁平均温度的方式比增加冻结壁厚度能更加有效地提高冻结壁的

关键词：井帮位移冻结壁厚度平均温度掘砌段高

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高寒地区混凝土井塔快速施工关键技术的研究

吴春杰,程正觉,国重宽,刘慧

《中国工程科学》 2011年第13卷第11期页码 72-80

摘要：

在西北高寒地区钢筋混凝土井塔施工中，通过对桩基范围人工冻土的快速解冻技术和高寒地区冬期井塔快速施工成套技术的研究应用，确保了工程质量，加快了井塔桩基和冬期井塔主体的施工速度，缩短了井塔施工工期，解决了高寒地区煤矿建设周期长的施工技术瓶颈问题。

关键词：西北高寒地区钢筋混凝土井塔人工冻融土快速解冻冬期井塔冬期快速施工成套技术

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冷冻-萃取/真空干燥法制备坚固和耐疲劳的聚酰亚胺纤维气凝胶及其增强阻燃性复合材料 Article

姚恺清, 宋崇虎, 方红, 王峰, 陈炼, 蒋少华, 查国君, 侯豪情

《工程（英文）》 2023年第21卷第2期页码 152-161 doi: 10.1016/j.eng.2021.08.024

摘要：

在现代新材料的快速发展中，用节能、省时、低成本和简便的新型方法制备具有优良机械性能和热学性能的轻质、低密度和高孔隙率气凝胶十分必要。在本工作中，我们使用短切电纺聚酰亚胺（PI）纤维作为支撑骨架，通过开发出一种无需特殊干燥方法的真空干燥（VD）与冷冻-萃取相结合的方法，制备出高性能PI 纤维气凝胶（PIFAs）。所得PIFAs 具有低密度（≤52.8 mg⋅cm⁻³）和高孔隙率（>96%）。该PIFA在至少20 000 次的循环压缩过程中展现出高度的耐疲劳性及低能量损失系数。密度为39.1 mg⋅cm⁻³的PIFA具有40.4 mW⋅m⁻¹⋅K⁻¹的热导率。通过进一步使用聚硅氮烷对PIFAs复合改性后，其具备更强的耐火性和氮气氛围中的高残留率（>70%）。这些优异的性能使PIFAs 及其复合材料成为可应用于建筑工业、航空和航天工业轻质材料、隔热和防火层以及高温反应催化剂载体的可选材料。此外，本工作中提出的冷冻-萃取/VD法因其节能、省时和节约成本而可被拓展用于制备其他材料。

关键词：聚酰亚胺气凝胶冷冻萃取真空干燥机械性能隔热性能防火性能