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Long-Term Performance and Microstructural Characterization of Dam Concrete in the Three Gorges Project

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Engineering 2024年第2期33卷 237-262页

作者： Chen Lyu Cheng Yu Chao lu Li Pan Wenwei Li Jiaping Liu School of Materials Science and Engineering Southeast UniversityNanjing 211189China State Key Laboratory of High Performance Civil Engineering Materials Sobute New Materials Co.Ltd.Nanjing 211103China China Three Gorges Corporation Wuhan 430010China

This study investigates the long-term performance of laboratory dam concrete in different curing environments over ten years and the microstructure of 17-year-old laboratory concrete and actual concrete cores drilled from the Three Gorges *** mechanical properties of the laboratory dam concrete,whether cured in natural or standard environments,continued to improve over ***,the laboratory dam concrete exhibited good resistance to diffusion and a refined microstructure after 17 ***,curing and long-term exposure to the local natural environment reduced the frost *** analyses of the laboratory concrete samples demonstrated that moderate-heat cement and fine fly ash(fa)particles were almost fully hydrated to form compact micro structures consisting of large quantities of homogeneous calcium(alumino)silicate hydrate(C-(A)-S-H)gels and a few *** obvious interfacial transition zones were observed in the microstructure owing to the longterm pozzolanic *** dense and homogenous microstructure was the crucial reason for the excellent long-term performance of the dam concrete.A high fa volume also played a significant role in the microstructural densification and performance growth of dam concrete at a later *** concrete drilled from the dam surface exhibited a loose microstructure with higher microporosity,indicating that concrete directly exposed to the actual service environment suffered degradation caused by water and wind *** this study,both macro-performance and microstructural analyses revealed that the application of moderate-heat cement and fa resulted in a dense and homogenous microstructure,which ensured the excellent long-term performance of concrete from the Three Gorges Dam after 17 ***-term exposure to an actual service environment may lead to microstructural degradation of the concrete ***,the retained long-term dam concrete samples need to be further researched to

关键词： Three Gorges Dam Long-term performance Microstructural analysis Moderate-heat cement Fly ash

Twenty-nine million intrinsic Q-factor monolithic microresonators on thin-film lithium niobate

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Photonics Research 2024年第8期12卷 I0001-I0006页

作者： XINRUI ZHU YAOWEN HU SHENGYUAN lu HANA KWARNER XUDONG LI YUNXIANG SONG LETÍCIA MAGALHÃES AMIRHASSAN SHAMS-ANSARI ANDREA CORDARO NEIL SINCLAIR MARKO LONČAR John A.Paulson School for Engineering and Applied Sciences Harvard UniversityCambridgeMassachusetts 02138USA State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China DRS Daylight Solutions San DiegoCalifornia 92127USA

The recent emergence of thin-film lithium niobate(TFLN)has extended the landscape of integrated *** has been enabled by the commercialization of TFLN wafers and advanced nanofabrication of TFLN such as high-quality dry ***,fabrication imperfections still limit the propagation loss to a few dB/m,restricting the impact of this ***,we demonstrate TFLN microresonators with a record-high intrinsic quality(Q)factor of twenty-nine million,corresponding to an ultra-low propagation loss of 1.3 dB/*** present spectral analysis and the statistical distribution of Q factors across different resonator *** work pushes the fabrication limits of TFLN photonics to achieve a Q factor within 1 order of magnitude of the material limit.

关键词： resonator lithium film

350MW超临界循环流化床锅炉耦合协调全负荷脱硝研究与实践

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煤炭科技 2024年第1期45卷 6-10页

作者：卢官发刘西影江苏华美热电有限公司江苏徐州221141

通过对现有循环流化床机组烟气氮氧化物排放浓度进一步降低的限制因素进行综合研判,提出了350 MW超临界循环流化床锅炉机组在不同负荷时的脱硝技术组合及运行控制策略。项目实施后,提前2年达到环保部门全负荷脱硝要求,取得了显著的社会... 详细信息

通过对现有循环流化床机组烟气氮氧化物排放浓度进一步降低的限制因素进行综合研判,提出了350 MW超临界循环流化床锅炉机组在不同负荷时的脱硝技术组合及运行控制策略。项目实施后,提前2年达到环保部门全负荷脱硝要求,取得了显著的社会效益和经济效益,在同类型循环流化床机组中具有良好的示范效果。

关键词：循环流化床耦合协调全负荷脱硝研究实践

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绿色装配式钢结构建筑可持续发展对策

Enhancive effect of N,N'-dinitrosopiperazine on inducing precancerous lesion on nasal and/or nasopharyngeal epithelia of TgN(p53mt-LMP1)/HT mice

建筑与装饰 2024年第9期 169-171页

作者：段晓丹闫禄发中国城市建设研究院有限公司北京 100120

现阶段我国社会经济发展十分迅猛,这时大众对生活品质的要求逐渐提高,尤其是在建筑行业的发展中,大众逐渐树立起绿色环保的思想理念,并不断探索出形式多样的建筑装配形式,而钢结构建筑在整个装配式建筑中占据着重要地位.但是,在绿色装... 详细信息

现阶段我国社会经济发展十分迅猛,这时大众对生活品质的要求逐渐提高,尤其是在建筑行业的发展中,大众逐渐树立起绿色环保的思想理念,并不断探索出形式多样的建筑装配形式,而钢结构建筑在整个装配式建筑中占据着重要地位.但是,在绿色装配式钢结构建筑的发展过程中,仍存在着诸多问题阻碍着其发展.因此,要加强对绿色装配式钢结构建筑发展中的问题进行全面分析,探索出有效的可持续发展战略,推动我国建筑行业的向前发展与进步.

关键词：绿色装配式钢结构建筑施工可持续发展

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第3期10卷 172-179页

作者： Dao-fa TIAN Ying-chun HE fang-guo lu fa-qing TANG faculty of Integrative Medicine Changsha 410007 China) faculty cf Basic Medicine Chinese Medicine University of Hunan Changsha 410007 China Department of Clinical Laboratory the First Xiangya Hospital Central South University Changsha 410008 China

Objective： To investigate the enhancive effect ofN, N′-dinitrosopiperazine （DNP） on induced carcinogenesis in nasal and/or nasopharyngeal epithelia among TgN（p53mt-LMP1）/HT transgenic mice to examine the underlying mechanism for the development of nasopharyngeal carcinoma （NPC）. Methods： TgN（p53mt-LMP1）/HT transgenic mice and the same strain of C57BL/6J wild-type mice both at the age of 5 months were randomly divided into 2 groups in parallel, respectively, i.e., TgN（p53mt-LMP1）/HT cancerous lesion-inducing group （T1）, TgN（p53mt-LMP1）/HT control group （TC）, C57BL/6J cancerous lesion-inducing group （CI）, and C57BL/6J control group （CC）. TI and CI mice were treated only with DNP for 16 weeks, twice each week, while TC and CC mice were given the same volume of saline as *** the end of treatment, animals were sacrificed to collect epithelial tissue samples from nasal cavity and nasopharynx for pathohistological evaluation by hacmatoxylin and eosin （HE） staining and for determination on the expression ofTRAF2, c-Jun, and p 16 by immunohistochemistry. Results： Atypical hyperplasia was more significant in the samples of TI than in those of TC, CI, and CC, with the rates of lesions being 90%, 10%, 0, and 0 （P〈0.01） respectively, though DNP was used alone in a much shortened inducing period at less dosage and without the use of carcinogenic promoter 12-0-tetradecanoylphorbol-13-acetate as usual. The expressions of tumor necrosis factor （TNF） receptor-associated factor 2 （TRAF2） and c-Jun in these samples were significantly up-regulated in TI （P〈0.0 I）, while tbe expression of p16 was significantly lower in TI than in the other groups （P〈0.01）. Conclusion： TgN（p53mt-LMPI）/HT mice hold inherited constitutional defect in immune surveillance function, which can be aggravated by environmental carcinogens, such as DNP used even though in a much less strength. The enhanced carcinogenesis-inducing effect of DNP on TgN（p53mt-LMP1）/HT mice should be closely associated with abn

关键词： Nasal epithelia Nasopharyngeal epithelia Precancerous lesions N N′-dinitrosopiperazine (DNP) Activator protein-1(AP- 1) pathway Signal transduction

Competitive Project Scheduling on Two Unbounded Parallel Batch Machines

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Journal of the Operations Research Society of China 2018年第3期6卷 349-389页

作者： Ling-fa lu Li-Qi Zhang School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China College of Information and Management Science Henan Agricultural UniversityZhengzhou 450003China

This paper considers competitive project scheduling on two unbounded parallel batch *** are two competing firms,and each firm has an unbounded parallel batch *** projects must be performed in batches by Firms 1 and 2 on their machines,*** profit that each firm obtains from each project depends on whether the firm finishes the job before or after its *** the first problem,given a feasible schedule for Firm 1,the objective is to find an optimal schedule to maximize the total reward for Firm 2 under the given schedule for Firm *** corresponding total reward for Firm 1 is called the worst-case total reward of the given schedule for Firm *** the second problem,the objective is to find an optimal schedule for Firm 1 to maximize the worst-case total *** provide optimal algorithms for the two problems,respectively.

关键词： Project scheduling Competition Parallel batch machine

基于ATP-EMTP的海上风电送出海缆工频过电压仿真分析

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电工电气 2024年第6期 35-39页

作者：何发武邓婧卢赓广州铁路职业技术学院广东广州511300 中国能源建设集团广东省电力设计研究院有限公司广东广州510663

海底长电缆线路的充电电容较高,在不同的运行工况下会产生较严重的过电压,而在高抗退出运行情况下,陆上架空送出线路故障产生的过电压会传送至海底电缆。结合工程实际,基于ATPEMTP软件对某海上风电场220 kV送出海缆及架空线路进行建模,... 详细信息

海底长电缆线路的充电电容较高,在不同的运行工况下会产生较严重的过电压,而在高抗退出运行情况下,陆上架空送出线路故障产生的过电压会传送至海底电缆。结合工程实际,基于ATPEMTP软件对某海上风电场220 kV送出海缆及架空线路进行建模,对不同运行工况下送出海缆工频过电压、送出架空线路短路故障及断线故障时的海缆工频过电压进行仿真计算,结果表明,合理的高抗配置方案可有效降低海上风电送出海缆的工频过电压水平。

关键词：海底电缆工频过电压海上风电 ATP-EMTP软件

基于自动机器学习集成模型的日NO_(2)模拟

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环境科学 2024年第10期45卷 5740-5747页

作者：卢凯凯李净刘德仁徐发昭张玉娜朱世鑫西北师范大学地理与环境科学学院兰州730070 兰州交通大学土木工程学院兰州730070

为深入了解近地面NO_(2)的空间分布,以长江三角洲地区为研究区,利用NO_(2)站点实测数据和结合对流层观测仪(TROPOMI)的NO_(2)柱浓度数据,充分考虑人口、高程和气象因素对NO_(2)的影响,利用自动机器学习选取了模拟精度较高的5种机器学习... 详细信息

为深入了解近地面NO_(2)的空间分布,以长江三角洲地区为研究区,利用NO_(2)站点实测数据和结合对流层观测仪(TROPOMI)的NO_(2)柱浓度数据,充分考虑人口、高程和气象因素对NO_(2)的影响,利用自动机器学习选取了模拟精度较高的5种机器学习算法:ET、RF、XGBoost、LightGBM和Catboost,并将这5种算法利用Stacking模型进行集成后对2020年3月至2021年2月长三角地区逐日NO_(2)浓度进行了模拟.结果表明,Stacking集成模型的RMSE和MAE值分别为7.078和5.270,其精度优于ET、RF、XGBoost、LightGBM和Catboost这5种单一的算法;长三角三省一市的NO_(2)高浓度值空间分布基本呈现以三省交汇处为中心口朝西南方向的U字形格局,以上海市、杭州市、南京市和合肥市为中心形成的城市群污染尤为显著,超过国家标准日限制的城市共27个,常州市是NO_(2)污染最严重的城市,NO_(2)浓度超标14 d,其次是上海市,超标13 ***_(2)浓度季节分布特点为:冬季>秋季>春季>夏季,其中夏季7月9日NO_(2)污染最轻,冬季12月23日NO_(2)污染最严重.

关键词：自动机器学习 NO_(2) 集成模型遥感时空分布

β-Cyclodextrin and its derivatives-enhanced solubility and biodegradation of 2-nitrobiphenyl

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Journal of Environmental Sciences 2006年第6期18卷 1157-1160页

作者： CAI Bang-cheng GAO Shi-xiang lu Gen-fa State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210093 China

This paper investigated the effects of β-cyclodextrins （I3-CD） and its two derivatives, hydroxypropyl-β-cyclodextrin （HPCD） and carboxymethyl-β-cyclodextrin （CMCD）, on the solubility and biodegradation of 2-nitrophenyl by an A cinetbacter sp. Results showed that β-CD, HPCD and CMCD could not be utilized by A cinetbacter sp. as sole carbon source and none of the CDs had toxic effects on the growth of the bacteria in the experiments; all the CDs could enhance the apparent solubility and accelerate the biodegradation of 2-nitrobipheny. It showed that biodegradation-accelerating effects of CDs on 2-nitrobiphenyl were correlated with their solubility-enhancing effects. Among three CDs investigated, CMCD had the most obvious effects both on the apparent solubility and the biodegradation, followed by β-CD and HPCD.

关键词： β-CD HPCD CMCD 2-nitrophenyl biodegradation