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垃圾焚烧炉渣在道路基层中的应用实验及数值分析

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科学技术与工程 2018年第11期18卷 148-155页

作者：薛国强陆聪顾欢达潘玲玲张宇唐强常熟市建筑学会常熟215500 苏州科技大学土木工程学院苏州215011 苏州大学轨道交通学院苏州215131

城市固体垃圾焚烧炉渣作为一种废弃物,具有广阔的资源化利用前景。为研究生活垃圾焚烧炉渣替代部分级配碎石在道路基层中应用的可行性,以焚烧炉渣和石灰岩级配碎石为原料,测试其基本性能。制备不同配合比的水泥稳定炉渣碎石试样,并进行... 详细信息

城市固体垃圾焚烧炉渣作为一种废弃物,具有广阔的资源化利用前景。为研究生活垃圾焚烧炉渣替代部分级配碎石在道路基层中应用的可行性,以焚烧炉渣和石灰岩级配碎石为原料,测试其基本性能。制备不同配合比的水泥稳定炉渣碎石试样,并进行无侧限抗压实验;采用MIdaS/GTS(geo-technical analysis system)对水泥稳定炉渣碎石作为道路基层进行数值模拟,探究在不同工况下路面结构的变形。结果表明:焚烧炉渣吸水率较高而密度较低,压碎值介于30%~45%,大于碎石20%的压碎指标但与海砂相似;且承受结晶压的坚固性良好;水泥稳定炉渣碎石的强度与刚度随着养生龄期的增长而增长,在相同的炉渣与水泥掺量下,原状炉渣试样强度和刚度明显低于同龄期破碎炉渣试样。数值模拟方面,在路面中心处受到轴载时,路面沉降随距路面中心线距离的增大而减小;在承载力满足要求的情况下,道路基层模量不是影响路面沉降的主要因素;增加水泥稳定炉渣碎石基层厚度则可以明显减小路面中心处沉降。

关键词：焚烧炉渣水泥稳定炉渣碎石道路基层强度数值分析

考虑冻融影响的河道淤泥气泡混合土压缩性及微观机理试验研究

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江苏建筑 2020年第3期 76-81页

作者：张琦顾欢达薛国强张益平苏州科技大学土木工程学院江苏苏州215011 常熟市住房和城乡建设局江苏常熟215500 常熟市工程质量检测中心江苏常熟215500

河道淤泥气泡混合土(FMLSS)是固体土体和微孔组成的非均质复合材料,是一种具有轻质、高强度的新型土工材料,工程应用范围较广。基于不同地域的工程应用,面对温度变化明显,温差较大区域,需要进一步考察冻融对FMLSS工程性质的影响,其中压... 详细信息

河道淤泥气泡混合土(FMLSS)是固体土体和微孔组成的非均质复合材料,是一种具有轻质、高强度的新型土工材料,工程应用范围较广。基于不同地域的工程应用,面对温度变化明显,温差较大区域,需要进一步考察冻融对FMLSS工程性质的影响,其中压缩性是影响地基土承载性能与变形的重要指标。通过室内试验,研究了FMLSS在冻融条件下的压缩性及微观机理。试验结果表明:冻融对FMLSS的压缩性具有较明显的影响,根据压缩前后FMLSS内部微观特征分析可知,冻融对FMLSS内部微孔分布特性的影响是导致FMLSS压缩性变化的重要因素。此外,气泡掺入比、原料土含水量、水泥掺入比、养护时间等因素也对冻融后的FMLSS压缩性具有一定的影响。

关键词：河道淤泥气泡混合土压缩性微观机理冻融

深基坑桩墩扶壁式复合土钉墙支护数值模拟分析研究

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苏州科技学院学报（工程技术版） 2011年第1期24卷 32-36页

作者：李丙坤顾欢达干兆和陈赟苏州科技学院土木工程学院江苏苏州215011 苏州二建建筑集团有限公司江苏苏州215011

为推广工程应用及建立合理的设计理论,需要对桩墩护壁式复合土钉墙的受力机理、变形特征及相关的影响因素进行深入研究。故此,运用三维有限元数值模拟方法,对于不同的桩墩植入深度,模拟分析了复合支护结构的受力、变形特征及其变化规律... 详细信息

为推广工程应用及建立合理的设计理论,需要对桩墩护壁式复合土钉墙的受力机理、变形特征及相关的影响因素进行深入研究。故此,运用三维有限元数值模拟方法,对于不同的桩墩植入深度,模拟分析了复合支护结构的受力、变形特征及其变化规律。通过模拟分析可知,桩墩植入深度应选取在1.0～1.2倍的基坑开挖深度,其变化对基坑的沉降及隆起影响不大。

关键词：桩墩扶壁式复合土钉墙土钉锚杆嵌固深度

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重金属污染土固化/稳定化研究进展

江苏建筑 2017年第4期 89-94页

作者：陆聪顾欢达张宇薛国强徐梦艺唐强苏州科技大学土木工程学院江苏苏州215011 苏州大学城市轨道交通学院江苏苏州215131

随着我国对于城市发展定位与发展规划的重新调整,工厂的迁离遗留了大量的重金属污染场地。国家近年相关政策动作不断,显示了对于土壤污染的重视和防治土壤污染的决心。污染土的修复改良处理是一种积极主动的处理方法,在土壤修复改良技... 详细信息

随着我国对于城市发展定位与发展规划的重新调整,工厂的迁离遗留了大量的重金属污染场地。国家近年相关政策动作不断,显示了对于土壤污染的重视和防治土壤污染的决心。污染土的修复改良处理是一种积极主动的处理方法,在土壤修复改良技术中固化/稳定法既可提高土体强度,又可降低重金属离子的溶出,是重金属污染场地修复处理技术中应用最广泛的方法之一。固化/稳定化材料种类繁多,并通过不同的固化机理作用于污染土体。本文归纳了以往学者的相关研究进展,论述了固化污染土的无侧限抗压强度和重金属浸出浓度的影响因素并介绍了国内外大型污染场地修复案例。

关键词：重金属污染土固化/稳定化强度淋滤

Materials and surface engineering to control bacterial adhesion and biofilm formation： A review of recent advances

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Frontiers of Chemical Science and Engineering 2014年第1期8卷 20-33页

作者： huan gu dacheng REN Department of Biomedical and Chemical Engineering Syracuse Biomaterials Institute Syracuse University Syracuse NY 13244 USA Department of Civil and Environmental Engineering Department of Biology Syracuse University Syracuse NY 13244 USA

Bacterial adhesion to surfaces and subsequent biofilm formation are a leading cause of chronic infections and biofouling. These processes are highly sensitive to environmental factors and present a challenge to research using traditional approaches with uncontrolled surfaces. Recent advances in materials research and surface engineering have brought exciting opportunities to pattern bacterial cell clusters and to obtain synthetic biofilms with well-controlled cell density and morphology of cell clusters. In this article, achievements in this field directions. we will review the recent and comment on the future

关键词： surface engineering materials bacterial adhesion biofilm control review

Weakened carbon and nitrogen metabolisms under post-silking heat stress reduce the yield and dry matter accumulation in waxy maize

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Journal of Integrative Agriculture 2020年第1期19卷 78-88页

作者： YANG huan gu Xiao-tian DING Meng-qiu LU Wei-ping LU da-lei Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College Yangzhou UniversityYangzhou 225009P.R.China Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009P.R.China Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education Yangzhou UniversityYangzhou 225009P.R.China

Post-silking high temperature is one of the abiotic factors that affects waxy maize(Zea mays L. sinensis Kulesh) growth in southern China. We conducted a pot trial in 2016–2017 to study the effects of post-silking daytime heat stress(35°C) on the activities of enzymes involved in leaf carbon and nitrogen metabolisms and leaf reactive oxygen species(ROS) and water contents. This study could improve our understanding on dry matter accumulation and translocation and grain yield production. Results indicated that decreased grain number and weight under heat stress led to yield loss, which decreased by 20.8 and 20.0% in 2016 and 2017, respectively. High temperature reduced post-silking dry matter accumulation(16.1 and 29.5% in 2016 and 2017, respectively) and promoted translocation of pre-silking photoassimilates stored in vegetative organs, especially in leaf. The lower leaf water content and chlorophyll SPAD value, and higher ROS(H2O2 and O2^-·) content under heat stress conditions indicated accelerated senescent rate. The weak activities of phosphoenolpyruvate carboxylase(PEPCase), Ribulose-1,5-bisphosphate carboxylase(Ru BPCase), nitrate reductase(NR), and glutamine synthase(GS) indicated that leaf carbon and nitrogen metabolisms were suppressed when the plants suffered from a high temperature during grain filling. Correlation analysis results indicated that the reduced grain yield was mainly caused by the decreased leaf water content, weakened NR activity, and increased H2O2 content. The increased accumulation of grain weight and post-silking dry matter and the reduced translocation amount in leaf was mainly due to the increased chlorophyll SPAD value and NR activity. Reduced PEPCase and Ru BPCase activities did not affect dry matter accumulation and translocation and grain yield. In conclusion, post-silking heat stress down-regulated the leaf NR and GS activities, increased the leafwater loss rate, increased ROS generation, and induced pre-silking carbohydrate tran

关键词： waxy maize heat stress nitrogen metabolism photosynthetic enzymes senescence dry matter

Investigations on the Interactions between Li-TFSI and Glass Fibers in the Ternary PP/GF/Li-TFSI Composites

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Chinese Journal of Polymer Science 2018年第1期36卷 113-118页

作者： Sen-Lin gu huan-huan Liu huan Cao Claude Mercier Yong-Jin Li College of Material Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 310036China Solvay Co.Ltd shanghai 201100China

The polypropylene/glass fiber（PP/GF） composites with excellent antistatic performance and improved mechanical properties have been reported by incorporation of a very small amount of the organic salt, lithium bis（trifluoromethanesulfonyl）imide（Li-TFSI）, into the PP/GF composites. It was considered that GF could play the role as the pathways for the movements of ions in the ternary composites. In this work, the interactions between Li-TFSI and glass fiber and the effects of such interactions on the physical properties of the composites have been systematically investigated. Three types of glass fibers with different ―OH group concentrations have been prepared in order to compare the interactions between GF and Li-TFSI. It was found that the ―OH group concentrations on the surface of glass fiber have significant effects on interactions between glass fibers and Li-TFSI. Such interactions are crucial for both the antistatic and mechanical performances of the final PP/GF/Li-TFSI composites. The investigation indicated that the GF with high ―OH group concentrations confined the movement of TFSI-, which decreased the antistatic properties of PP/GF/Li-TFSI composites. On the other hand, the GF with low ―OH group concentrations inhibited the absorption of Li-TFSI onto the GF, which also hindered the formation of Li-TFSI conductive pathway. The best antistatic performance of the ternary composites can be achieved at the intermediate ―OH concentrations on the GF.

关键词： Polypropylene Glass fiber Li-TFSI Antistatic performance

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纤维加筋土技术研究进展

江苏建筑 2018年第4期 108-112页

作者：吴会龙潘玲玲薛国强顾欢达栗楷博沈伟苏州科技大学土木工程学院江苏苏州215011 苏州大学轨道交通学院江苏苏州215131 中铁十七局集团有限公司山西太原030006 苏州轨道交通集团有限公司江苏苏州215004

加筋土技术进展历史悠久,加筋材料作为加筋土的核心内容,成为道路、地质和岩土工程领域的研究热点。区别于传统的加筋材料,纤维材料具有分散性好、易于拌和、无污染、改良后土体各向同性和强度较高等优势。纤维种类是影响纤维加筋土性... 详细信息

加筋土技术进展历史悠久,加筋材料作为加筋土的核心内容,成为道路、地质和岩土工程领域的研究热点。区别于传统的加筋材料,纤维材料具有分散性好、易于拌和、无污染、改良后土体各向同性和强度较高等优势。纤维种类是影响纤维加筋土性质的一个关键因素,主要分为天然纤维和人工合成纤维2大类。目前对于纤维加筋土的工程性质研究主要以室内试验为主,主要包括抗压强度(无侧限抗压强度试验)、抗剪强度(直剪试验、三轴剪切试验)和抗拉强度。文章主要归纳了国内外诸多学者关于纤维加筋土的相关研究成果并介绍了纤维加筋技术在实际工程中的应用案例。

关键词：加筋土纤维材料工程性质工程应用

Deep feature extraction and motion representation for satellite video scene classification

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Science China(Information Sciences) 2020年第4期63卷 97-111页

作者： Yanfeng gu huan LIU Tengfei WANG Shengyang LI guoming GAO School of Electronics and Information Engineering Harbin Institute of Technology Technology and Engineering Center for Space Utilization Chinese Academy of Sciences The Key Laboratory of Space Utilization Chinese Academy of Sciences

Satellite video scene classification(SVSC) is an advanced topic in the remote sensing field, which refers to determine the video scene categories from satellite videos. SVSC is an important and fundamental step for satellite video analysis and understanding, which provides priors for the presence of objects and dynamic events. In this paper, a two-stage framework is proposed to extract spatial features and motion features for SVSC. More specifically, the first stage is designed to extract spatial features for satellite *** frames are firstly selected based on the blur detection and spatial activity of satellite *** the fine-tuned visual geometry group network(VGG-Net) is transferred to extract spatial features based on spatial content. The second stage is designed to build motion representation for satellite *** motion representation of moving targets in satellite videos is first built by the second temporal principal component of principal component analysis(PCA). Second, features from the first fully connected layer of VGG-Net are used as high-level spatial representation for moving targets. Third, a small network of long and short term memory(LSTM) is further designed for encoding temporal information. Two-stage features respectively characterize spatial and temporal patterns of satellite scenes, which are finally fused for SVSC.A satellite video dataset is built for video scene classification, including 7209 video segments and covering 8 scene categories. These satellite videos are from Jilin-1 satellites and Urthecast. The experimental results show the efficiency of our proposed framework for SVSC.

关键词： satellite videos classification convolutional neural network CNN long and short term memory LSTM motion representation