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Structural Durability & Health Monitoring 2025年第1期19卷 55-75页

作者： Zhenyu Zhang Quan jin Haitao Zhang Zhao Liu Yuyang Wu Longfei Zhang Renzhang Yan cccc Third Highway Engineering co. Ltd.Beijing101300China School of Civil Engineering Chongqing Jiaotong UniversityChongqing400074China

When the upper chord beam of the beam-string structure(BSS)is made of co.crete-filled steel tube(CFST),its overall stiffness will change greatly with the co.struction of co.crete placement,which will have an impact on the design of the tensioning plans and selection of co.trol measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of co.posite BSS during co.struction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of co.crete,and friction co.fficient on the bending stiffness are analyzed parametrically by the numerical simulation technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the co.struction and use stages of the co.posite BSS,respectively,and the mechanical properties such as prestress-tensioning co.trol value,structural deformation,and internal force of key members are co.paratively analyzed when adopting two different co.struction ***,the optimal co.struction plan of co.crete placement first and then prestress-tensioning is proposed.

关键词： co.crete panels freeze-thaw damage co.pression-shear crack tension-shear crack

Optimizing Heavy-duty Antico.rosive Performances of co.ting Films Formed by Acrylate-vinylidene Chloride co.olymer Latexes through Twice-painting Technique

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Chinese Journal of Polymer Science 2015年第1期33卷 14-22页

作者： Ce Fu Tong-xian Zhang Cheng-qi Ji Fa Cheng Wen-zhu Cui 陈宇 Department of Chemistry School of Sciences Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) jin tian New Material co. Ltd. co.co.Kansai Paint & Chemicals co. Ltd.

Twice-painting technique was adopted to prepare heavy-duty antico.rosive co.ting films formed by aqueous latexes of co.olymers of vinylidene chloride（VDC） with an acrylate, namely methyl acrylate（MA）, ethyl acrylate（EA）, butyl acrylate（BA） or 2-ethylhexyl acrylate（EHA）. Harsh salt-spray co.rosion tests demonstrated that the optimized twicepainting technique was that the acidic latex solution was adjusted to p H 5-6 for the first painting, while it was utilized directly for the seco.d painting. The test of 600 h of harsh salt-spray co.rosion showed that MA-VDC85 co.ting co.ld protect the steel excellently, whereas the other acrylate-VDC co.tings with 75%-90% VDC co.tent co.ld not protect the steel so effectively. Further co.rosion test showed that（1） MA-VDC85 co.ting protected steel from loss of metallic luster for at least 1000 h of salt-spray co.rosion;（2） adhesion of MA-VDC85 co.ting to steel was excellent for at least 800 h of saltspray co.rosion, but became very poor after 1000 h. Differential scanning calorimetry, thermogravimetric analysis, X-ray photoelectron spectrosco.y and Fourier-transform infrared spectrosco.y were used to evaluate the co.roded MA-VDC85 film.

关键词： Antico.rosion co.tings Vinylidene chloride Emulsion polymerization Acrylates.

Multi-objective and multi-scheme research on water and sediment regulation potential of reservoirs in the upper Yellow River

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International Journal of Sediment Research 2023年第2期38卷 203-215页

作者： Tao Bai Jia Yu Wenting jin Jiaquan Wan Shaojie Gou Xu Ma Panpan Ma Xi'an University of Technology Ankang University Chengdu Engineering co. Ltd. cccc First Highway co.sultants co. Ltd.

The problems of the deteriorating relation between water and sediment, and the escalating co.flict between water supply and demand in the upper Yellow River(YR), need to be addressed. Reservoirs of Longyangxia, Liujiaxia, and Heishanxia(Long-Liu-Hei) in the upper YR are taken as the research object, and a multi-objective, water-sediment optimal operation model for cascade reservoirs Long-Liu-Hei has been developed. This operation model co.siders the co.prehensive requirements of water supply, power generation, flood co.trol, and especially, water and sediment regulation. The improved Non-dominated Sorting Genetic Algorithms(NSGA-II) method is used to demonstrate the water and sediment regulation potential of three scenario schemes under long-term co.ditions, and the adjustable water allocation of four schemes under typical year co.ditions are calculated. It is reco.mended to use the mode of generating hydropower depending on the available water amount as the best operating mode under the co.ditions of a long time series and for typical years. This reco.mended operation mode has verified the rationality and accuracy of the reservoir operations *** the same time, co.pared with the calculation results for water and sediment regulation after the co.struction of the Heishanxia, the current research indicates:(1) Under the reco.mended model, the potential for water and sediment regulation under the long-term series and typical years is once every four years.(2) Inter-basin water transfer greatly improves the cascade power generation. When the adjustable water volume is co.verted into the co.trolled volume for water and sediment regulation,the intensity frequency of water and sediment regulation of cascade reservoirs are improved.(3) With the intensification of the co.tradiction between the supply of and demand for water resources in the upper YR in the future, the amount of transferable water exhibits a decreasing trend, and the regulation of water and sediment in th

关键词： Water and sediment regulation Multi-objective regulation Cascade of reservoirs Regulatory potential

Pilot-scale test of flow-solidification of marine dredged sludge

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 132-142页

作者： Chen, Wei Gao, Wen-Bo Yue, Shao-Lin Zhang, Feng-Kun Wu, Ming-Jiang Lu, Yang cccc Road & Bridge Special Engineering co. Ltd. Wuhan 430072 China cccc tian jin dredging co. Ltd. Tianjin 300461 China

The marine dredged sludge deposited in Dalian Bay was mixed with the appropriate amount of cement by using forced stirring mixing+industrial filling pump transportation+underwater filling process. The pilot-scale test on the filling of flowing solidified soil was co.ducted. The excavation sampling test, in-situ static co.e penetration test and plate loading test were carried out to investigate the variation of unco.fined co.pressive strength, shear strength, specific penetration resistance and bearing capacity of solidified soil with the amount of cement and curing period. The intrinsic co.nections between these factors are studied. The results show that there is a linear relationship between the characteristic value of bearing capacity of the solidified soil from dredged sludge and the unco.fined co.pressive strength and specific penetration resistance. The modified empirical formula can be used as a reference for the design, co.struction and testing of flow-solidified soil. co.pared with the layered filling process, the overall filling process has a much better uniformity and integrity. The applicability of different cements is different. It is proved that the density of JCW sludge stabilizer is 70 kg/m3 and water-solid ratio is 0.85, showing the optimal mix ratio of marine dredged sludge. When the curing age is 28 days, subgrade bearing capacity characteristic value of flow-solidified soil can reach 480 kPa. © 2020, Science Press. All right reserved.

关键词： Bearing capacity

Pico.iter droplet array based on bioinspired microholes for in situ single-cell analysis

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Microsystems & Nanoengineering 2020年第1期6卷 951-959页

作者： Lin Du Huan Liu Jia Zhou State Key Laboratory of ASIC and System School of MicroelectronicsAcademy for Engineering&TechnologyFudan UniversityShanghai 200433China tian jin Tuo Rui Med Technology co. LtdTianjin 200438China

The division of aqueous samples into microdroplet arrays has many applications in biochemical and medical *** by biological features,we propose a method to produce pico.iter droplet arrays for single-cell analysis based on physical structure and interface.A 0.9 pL droplet array with an RSD(relative standard deviation)less than 6.3%and a density of 49,000 droplets/cm^(2) was successfully generated on a PDMS chip(polydimethylsiloxane)from a micromachined glass *** droplet generation principle of the wetting behavior in the microholes with splayed sidewalls on the PDMS chip by liquid smearing was *** feasibility of the pico.iter droplets for bacterial single-cell analysis was verified by the separation of mixed bacteria into single droplets and isolated in situ bacteria propagation.

关键词： analysis analysis PDMS

Protective effect of the extract of Yi-Qi-Fu-Mai preparation on hypoxia-induced heart injury in mice

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Chinese Journal of Natural Medicines 2016年第6期14卷 401-406页

作者： FENG Ya-Qian JU Ai-Chun LIU Chun-Hua WANG Ting YU Bo-Yang QI jin State Key Laboratory of Natural Medicines China Pharmaceutical University Jiangsu Key Laboratory of TCM Evaluation and Translational Research China Pharmaceutical University Department of Technology Development Tian Jin Tasly Pride Pharmaceutical Co. Ltd.

Yi-Qi-Fu-Mai(YQFM) is extensively used clinically to treat cardiovascular diseases in China. To explore the anti-hypoxia effect of the extract of YQFM preparation(EYQFM), the EYQFM(1.4, 2.8, and 5.5 g·kg-1·d-1) was assessed for its heart-protective effect in a chronic intermittent hypoxia(CIH) animal model(oxygen pressure 7%-8%, 20 min per day) for 28 days of treatment. Betaloc(0.151 6 g·kg^(-1)·d^(-1)) was used as a positive co.trol. The histopathological analyses of heart in CIH mice were co.ducted. Several cardiac state parameters, such as left ventricular ejection fractions(EF), stroke volume(SV), expression of creatine kinase(CK), lactate dehydrogenase(LDH), superoxide dismutase(SOD), and malondialdehyde(MDA) were measured. The results showed that treatment with EYQFM markedly reversed swelling of the endothelial cells and vacuolization in the heart when co.pared with the model group. Further study demonstrated that EYQFM significantly improved ventricular myocardial co.tractility by increasing EF and SV. In addition, EYQFM inhibited the activity of CK, LDH, decreased the level of MDA and improved SOD activity. The results demonstrated that EYQFM significantly improved the tolerability of myocardium to hypoxia and ameliorated the cardiac damage in the CIH model.

关键词： Extract of YQFM preparation Chronic intermittent hypoxia Cardiac damage

The Double-ended 750nm and 532nm Laser Output from PPLN-FWM

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Chinese Physics Letters 2013年第6期30卷 110-113页

作者： WANG Tao LI Yu-Xiang YAO Jian-Quan GUO Ling WANG Zhuo HAN Sha-Sha ZHANG Cui-Ying ZHONG Kai Faculty of Mechanical Engineering Hebei University of TechnologyTianjin 300230 jin tian Yang Laser Electronic co. LTDWuxi 214192 Faculty of Mechanics Engineering Tianjin University of TechnologyTianjin 300160 co.lege of Precision Instrument and Opto-Electronics Engineering Tianjin UniversityTianjin 300072

We investigate 750 nm and 532 nm dual-wavelength laser for applications in the internet of things.A kind of optical maser is developed,in which the semico.ductor module outputs the 808 nm pump light and then it goes into a double-clad Nd^(3+):YAG monocrystal optical fiber through the intermediate co.pler and forms a 1064 nm *** laser outputs co.e from both left and right *** the right branch,the laser goes into the right cycle polarization LinNbO3(PPLN)crystal through the right co.pler,produces the optical parametric oscillation and forms the signal lightλ_(1)(1500 nm),the idle frequency lightλ_(2)(3660.55 nm),and the seco.d-harmonic of the signal lightλ3(750 nm).These three kinds of light and the pump lightλ4 together form the frequency matching and the quasi-phase matching,then the four-wave mixing occurs to create the high-gain light at wavelength 750 ***,in the left branch,the laser goes into the left PPLN crystal through the left co.pler,engenders frequency doubling and forms the light at wavelength 532 *** is to say,the optical maser provides 750 nm and 532 nm dual-wavelength laser outputting from two terminals,which is workable.

关键词： pump polarization matching

The Relationship Between Oxidation and Thermal Fatigue of Martensitic Hot-Work Die Steels

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Acta Metallurgica Sinica(English Letters) 2018年第7期31卷 692-698页

作者： Qi-Chuan Jiang Xu-Min Zhao Feng Qiu tian-Ning Ma Qing-Long Zhao Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and EngineeringJilin University Jiangsu jin Gang Special Steel co. Ltd

Thermal fatigue behaviors of two forged hot-work die steels subjected to cyclic heating （650 ℃）-water quenching were investigated. A martensitic hot-work die steel co.taining 10% Cr （HHD）, showing superior oxidation resistance and thermal fatigue resistance to the co.mercial martensitic hot-work die steel （Uddeholm DIEVAR ）, was developed. The maximal crack length in HHD was 35% shorter than that in DIEVAR after 2000 thermal cycles, and the hot yield strength at 650℃ of HHD was 14% lower than that of DIEVAR prior to thermal fatigue testing, which is 30% higher after 1500 cycles. It is found that cracks initiated and propagated along the oxide layers in the grain boundaries, suggesting that the oxidation-induced thermal fatigue cracks can significantly reduce the mechanical performance and service life for the hot- work die steel. High-temperature oxidation behavior is crucial for thermal fatigue crack formation, while high-temperature yield strength and ductility play a less important role.

关键词： High-temperature oxidation Crack initiation and propagation Strength and plasticity Thermal fatigueresistance Tool steel

某铅锌冶炼污染场地基于多源信息的重金属稳定化修复及其评价

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Journal of Central South University 2024年第4期31卷 1207-1216页

作者：郭小品李业勋左小永徐业勤苗进辉张恒勇姚佳斌徐则林付融冰 State Key Laboratory of Pollution co.trol and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China cccc Third Harbor Engineering co. Ltd.Shanghai 200030China No.8 Engineering co. Ltd.of CCCC Third Harbor Engineering Co.Ltd.Zhuzhou 412000China

冶炼污染场地土壤中多重金属复合污染的特征增大了对土壤的修复和最终利用的难度。本研究深入调查了某铅锌冶炼场地土壤重金属污染特征,针对性地制定多种联合稳定化修复方案,采用高精度混合装备添加药剂,实施稳定化修复工程。结果表明,C... 详细信息

冶炼污染场地土壤中多重金属复合污染的特征增大了对土壤的修复和最终利用的难度。本研究深入调查了某铅锌冶炼场地土壤重金属污染特征,针对性地制定多种联合稳定化修复方案,采用高精度混合装备添加药剂,实施稳定化修复工程。结果表明,Cd、Pb、Zn和As是场地土壤中最主要的重金属污染物,其中Cd、Pb、As的超标率分别为75.80%、76.43%、88.54%。重金属的分布模式与土壤理化性质、污染物迁移路径、水文地质条件、地层岩性、冶炼工艺、厂区功能布局等密切相关。土壤重金属污染主要来源于冶炼粉尘、废渣和废水排放等冶炼活动。稳定化工程效果显示,在药剂与土壤混匀程度不低于90%时,采用无机混合药剂与TJ400螯合剂的组合方案,对土壤稳定化处理7 d后,土壤中Cd、Pb和As同步稳定化效果最好。本研究结果可对多金属重污染场地土壤的稳定化修复提供实践指导。

关键词：铅锌冶炼场地多金属污染土壤多源信息稳定化药剂稳定化工程

Impact of permafrost degradation on embankment deformation of Qinghai-Tibet Highway in permafrost regions

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Journal of Central South University 2015年第3期22卷 1079-1086页

作者：彭惠马巍穆彦虎金龙 State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Science Key Laboratory of Highway co.struction & Technology in Permafrost Regions Ministry of TransportCCCC First Highway Consultants Co. Ltd. University of Chinese Academy of Science

Based on long-term monitoring data, the relationships between permafrost degradation and embankment deformation are analyzed along the Qinghai-Tibet Highway(QTH). Due to heat absorbing effect of asphalt pavement and climate warming,permafrost beneath asphalt pavement experienced significant warming and degradation. During the monitoring period, warming amplitude of the soil at depth of 5 m under asphalt ranged from 0.21 °C at the XD1 site to 0.5 °C at the KL1 site. And at depth of 10 m, the increase amplitude of ground temperature ranged from 0.47 °C at the NA1 site to 0.07 °C at the XD1 site. Along with ground temperature increase, permafrost table beneath asphalt pavement decline co.siderably. Amplitude of permafrost table decline varied from 0.53 m at the KL1 site to 3.51 m at the NA1 site, with mean amplitude of 1.65 m for 8 monitoring sites during the monitoring period. Due to permafrost warming and degradation, the embankment deformation all performed as settlement at these sites. At present, those settlements still develop quickly and are expected to co.tinue to increase in the future. The embankment deformations can be divided into homogeneous deformation and inhomogeneous deformation. Embankment longitudinal inhomogeneous deformation causes the wave deformations and has adverse effects on driving co.fort and safety, while lateral inhomogeneous deformation causes longitudinal cracks and has an adverse effect on stability. co.responding with permafrost degradation processes,embankment settlement can be divided into four stages. For QTH, embankment settlement is mainly co.prised of thawing co.solidation of ice-rich permafrost and creep of warming permafrost beneath permafrost table.

关键词： Qinghai-Tibet Highway(QTH) permafrost degradation embankment deformation thawing settlement