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Numerical analysis of thermal-hydraulic behavior of supercritical water in vertical upward/downward flow channels

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Nuclear Science and Techniques 2008年第3期19卷 178-186页

作者： GU hanyang YU Yiqi cheng Xu LIU Xiaojing School of Nuclear Science and Engineering Shanghai Jiaotong University Shanghai 200240 China

Investigations on the thermal-hydraulic behavior in the SCWR fuel assembly have obtained a significant attention in the international SCWR community. However, there is still a lack of understanding of the heat transfer behavior of supercritical fluids. In this paper, the numerical analysis is carried out to study the thermal-hydraulic behaviour in vertical sub-channels cooled by supercritical water. Remarkable differences in characteristics of secondary flow are found, especially in square lattice, between the upward flow and downward flow. The turbulence mixing across sub-channel gap for downward flow is much stronger than that for upward flow in wide lattice when the bulk temperature is lower than pseudo-critical point temperature. For downward flow, heat transfer deterioration phenomenon is suppressed with respect to the case of upward flow at the same conditions.

关键词：传热理论热转换数字分析水力行为

Regioselective oxidation of tetracycline by permanganate through alternating susceptible moiety and increasing electron donating ability

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Journal of Environmental Sciences 2020年第1期32卷 281-288页

作者： Xiaohua Jiang William AJefferson Dean Song hanyang cheng Fengmin Li Zhimin Qiang Aiqian Zhang Huijuan Liu Jiuhui Qu College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China The State Agriculture Ministry Laboratory of Quality&Safety Risk Assessment for Tobacco Tobacco Research InstituteChinese Academy of Agricultural SciencesQingdao 266101China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Enuironmental SciencesChinese Academy of SciencesBeijing 100085China

Permanganate has attracted much attention in wide range of chemistry and particularly in degradation of environmental ***,few studies have discussed the feature of regioselective reactivity of permanganate with specific moiety of the target ***,we studied the reaction between permanganate and tetracycline that is an emerging micropollutant with different species containing several electron-rich *** second-order rate constants increased from 6.0 to 9.0 and could be quantitatively modeled by considering the speciation of both reactants,yielding kTC0=11.7(mol/L)^-1 sec^-1,kTC-=35.7(mol/L)^-1 sec^-1,kTC2-=43.1(mol/L)^-1 sec^-1 for individual reaction *** products were then identified as the hydroxylated and demethylated *** result suggested a rate-limiting step of simple hydroxylation at the phenolic and/or alkene moieties,while the demethylation should be caused by the unavoidably formed manganese oxide via single electron *** is supported by the DFT calculation,indicating the primary oxidation of phenolic group of TC0 with activation barrier of 44.5 kcal/mol and of alkene group of TC-and TC2-with activation barriers of 44.0 and 43.4 kcal/mol,*** is in agreement with the experimental results,implying the alternation of regioselectivity associated with the deprotonation *** result was further supported by performing the Fukui function and electrostatic potential analysis,reflecting the more probable site and better electron donating tendency beneficial to the permanganate oxidation.

关键词： Permanganate oxidation of tetracycline Regioselective reactivity Rate-limiting hydroxylation step Altered susceptible moiety Increased electronegativity

Asymmetric Synthesis of Dihydrospirotryprostatin B via a Silica Gel-Mediated Cyclization of Tryptamine-Ynamide

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Chinese Journal of Chemistry 2024年第12期42卷 1355-1359页

作者： Changhong Han Lu Yang Kaizong Yao Sen Zhang Jiayue Fu hanyang Sun Hongsheng Xu Bin Lin Maosheng cheng Yongxiang Liu Key Laboratory of Structure:Based Drug Design and Discovery of Ministry of Education Shenyang Pharmaceutical UniversityShenyangLiaoning 110016China Wuya College of Innovation Shenyang Pharmaceutical UniversityShenyangLiaoning 110016China Institute of Drug Research in Medicine Capital of China BenxiLiaoning 117000China Zhejiang Shapuaisi Pharmaceutical Co. LtdPinghuZhejiang 314299China

Comprehensive Summary An asymmetric synthesis of dihydrospirotryprostatin B was achieved in 15 steps(8 purifications)from *** main feature of our synthetic strategy is the efficient construction of spirocyclic oxindole intermediate containing a chiral quaternary carbon center,involving the silica gel-mediated cyclization of tryptamine-ynamide and oxidation under neat conditions.

关键词： Asymmetric synthesis Alkaloids Dihydrospirotryprostatin B Tryptamine-ynamide Cross-coupling Silica gel-mediated cyclization Oxidation

AcWRKY28 mediated activation of AcCPK genes confers salt tolerance in pineapple(Ananas comosus)

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Horticultural Plant Journal 2024年第2期10卷 398-412页

作者： Qiao Zhou Samaranayaka Vidana Gamage Nirosha Priyadarshani Rongjuan Qin Han cheng Tiantian Luo Myat Hnin Wai Mohammad Aqa Mohammadi Yanhui Liu Chang Liu hanyang Cai Xiaomei Wang Yeqiang Liu Yuan Qin Lulu Wang Guangxi Key Lab of Sugarcane Biology State Key Laboratory for Conservation and Utilization of Subtropical Agro-BioresourcesCollege of AgricultureGuangxi UniversityNanningGuangxi 530004China State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops College of Life ScienceCollege of Plant ProtectionCollege of AgricultureCollege of HorticultureFujian Provincial Key Laboratory of Haixia Applied Plant Systems BiologyCenter for Genomics and BiotechnologyFujian Agriculture and Forestry UniversityFuzhouFujian 350002China Pingtan Science and Technology Research Institute of Fujian Agriculture and Forestry University PingtanFujian 350400China National Education Commission BMICHColombo00700Sri Lanka Fishery Multiplication Management Station of Lijiang River Water Supply Hub Project GuilinGuangxi 541001China Horticulture Research Institute Guangxi Academy of Agricultural SciencesNanning Investigation Station of South Subtropical Fruit TreesMinistry of AgricultureNanningGuangxi 530007China

Unfavorable environmental cues severely affect crop productivity resulting in significant economic losses to farmers. In plants, multiple regulatory genes, such as the WRKY transcription factor (TF) family, modulate the expression of defense genes. However, the role of the pineapple WRKY genes is poorly understood. Here, we studied the pineapple WRKY gene, AcWRKY28, by generating AcWRKY28 over-expressing transgenic pineapple plants. Overexpression of AcWRKY28 enhanced the salt stress resistance in transgenic pineapple lines. Comparative transcriptome analysis of transgenic and wild-type pineapple plants showed that “plant-pathogen interaction” pathway genes, including 9calcium-dependent protein kinases (CPKs), were up-regulated in AcWRKY28 over-expressing plants. Furthermore, chromatin immunoprecipitation and yeast one-hybrid assays revealed AcCPK12, AcCPK3, AcCPK8, AcCPK1, and AcCPK15 as direct targets of AcWRKY28. Consistently, the study of AcCPK12 over-expressing Arabidopsis lines showed that AcCPK12 enhances salt, drought, and disease resistance. This study shows that AcWRKY28 plays a crucial role in promoting salt stress resistance by activating the expression of AcCPK genes.

关键词： Pineapple AcWRKY AcCPK Transcription factor Salt stress ChIP

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行业协会促进了小微企业创新吗

中国经济问题 2024年第1期 92-106页

作者：华汉阳朱启贵程名望上海交通大学安泰经济与管理学院同济大学经济与管理学院

本文基于2015年中国小微企业调查数据和2010年中国私营企业调查数据,研究了行业协会对小微企业创新的影响。研究发现:行业协会能够显著促进小微企业创新投入和创新产出,在经过一系列稳健性检验和内生性讨论后,结果依旧稳健;行业协会通... 详细信息

本文基于2015年中国小微企业调查数据和2010年中国私营企业调查数据,研究了行业协会对小微企业创新的影响。研究发现:行业协会能够显著促进小微企业创新投入和创新产出,在经过一系列稳健性检验和内生性讨论后,结果依旧稳健;行业协会通过资金支持、市场支持、政府支持以及技术支持来促进小微企业创新,其中市场支持、资金支持、政府支持和技术支持对小微企业创新的边际影响依次递减;体制外行业协会对小微企业创新的促进作用大于体制内行业协会。基于研究结论,本文提出了进一步发挥行业协会促进小微企业创新作用的政策建议。

关键词：行业协会商会科技创新脱钩改革 Eprobit模型

Progress and prospects of chiral nanomaterials for biosensing platforms

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Rare Metals 2024年第6期43卷 2469-2497页

作者： Yu-cheng Ouyang Bong-Jun Yeom Yuan Zhao Wei Ma School of Food Science and Technology State Key Laboratory of Food Science and ResourcesJiangnan UniversityWuxi 214122China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnanUniversityWuxi214122China Department of Chemical Engineering Hanyang UniversitySeoul04763RepublicofKorea

Chiral nanomaterials have distinct chiroptical properties of preferential interactions to circularly polarized ***-based biosensors have emerged for detection of biomolecules,ions and cells in recent *** review provides an extensive overview of biosensors based on chiral nanomaterials,starting with approaches to chiral nanomaterials construction in terms of fabrication *** of chiral nanomaterials and their biosensor applications is presented for different material types,with special emphasis on the role and importance of material properties and signal generation in *** assessed the technological prospects of the emerging fields of chiral construction,circularly polarized luminescence,Raman optical activity and so on along with their current *** venues for future research on chiral nanomaterials in fabrication,biosensing,disease diagnosis and treatment are also presented in the review.

关键词： Chiral nanomaterials Circular dichroism Biosensors

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典型煤制气废水处理工艺优化改造研究

工业水处理 2020年第10期40卷 126-128页

作者：程瀚洋夏俊兵王波刘永健刘会娟吴秀章中国大唐集团科学技术研究院有限公司北京100040 中国科学院生态环境研究中心北京100085 中新能化科技有限公司北京100062 中国大唐集团公司北京100033

介绍了某煤制天然气项目废水处理工艺现状、存在问题及优化改造建议。该项目废水中难降解有机污染物浓度高,处置困难,当前采用的处理工艺包括主生化、深度处理和回用工艺。深度处理系统出水水质差和膜装置处理能力不足是制约当前系统运... 详细信息

介绍了某煤制天然气项目废水处理工艺现状、存在问题及优化改造建议。该项目废水中难降解有机污染物浓度高,处置困难,当前采用的处理工艺包括主生化、深度处理和回用工艺。深度处理系统出水水质差和膜装置处理能力不足是制约当前系统运行效果的重要因素。建议通过新增臭氧催化氧化工艺改善深度处理段出水水质,同时对膜装置扩容提升废水处理能力,通过以上措施可有效地从水质和水量角度改善当前废水处理系统的处理效果。

关键词：煤化工废水零排放优化改造臭氧催化氧化

沉积物中210Pb、210Po和226Ra的分析及现代沉积速率的测定

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海洋通报 1985年第6期 10-14页

作者：邹汉阳曾文义程汉良吴世炎国家海洋局第三海洋研究所

210Pb测年法是七十年代国际上新发展的一项同位素测年技术。它能定量地提供近百年来沉积物年龄和沉积速率等资料,对于海洋工程建设,现代沉积作用和污染史的研究等均具有重要意义。通常沉积物中210Pb的测定有两类方法:一是从沉积物中分... 详细信息

210Pb测年法是七十年代国际上新发展的一项同位素测年技术。它能定量地提供近百年来沉积物年龄和沉积速率等资料,对于海洋工程建设,现代沉积作用和污染史的研究等均具有重要意义。通常沉积物中210Pb的测定有两类方法:一是从沉积物中分离出210Pb,纯化制源后放置一个月以上,使其子体210Bi与210Pb达到平衡,尔后测量210Bi的β放射性;二是以

关键词： Pb 本底值测年 Po 现代沉积速率 Ra

Ground-Based Hyperspectral Stereoscopic Remote Sensing Network: A Promising Strategy to Learn Coordinated Control of O_(3) and PM_(2.5) over China

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Engineering 2022年第12期19卷 71-83页

作者： cheng Liu chengzhi Xing Qihou Hu Qihua Li Haoran Liu Qianqian Hong Wei Tan Xiangguang Ji Hua Lin Chuan Lu Jinan Lin hanyang Liu Shaocong Wei Jian Chen Kunpeng Yang Shuntian Wang Ting Liu Yujia Chen Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Lab of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei 230026China Anhui Province Key Laboratory of Polar Environment and Global Change University of Science and Technology of ChinaHefei 230026China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China School of Environment and Civil Engineering Jiangnan UniversityWuxi 214122China

With the coming of the“14th Five-Year Plan,”the coordinated control of particulate matter with an aerodynamic diameter no greater than 2.5 lm(PM_(2.5))and O_(3) has become a major issue of air pollution prevention and control in *** stereoscopic monitoring of regional PM_(2.5) and O_(3) and their precursors is crucial to achieve coordinated ***,current monitoring networks are currently inadequate for monitoring the vertical profiles of both PM_(2.5) and O_(3) simultaneously and support air quality *** University of Science and Technology of China(USTC)has established a nationwide ground-based hyperspectral stereoscopic remote sensing network based on multi-axis differential optical absorption spectroscopy(MAX-DOAS)since *** monitoring network provides a significant opportunity for the regional coordinated control of PM_(2.5) and O_(3) in ***-year vertical profiles of aerosol,NO_(2) and HCHO monitored from four MAX-DOAS stations installed in four megacities(Beijing,Shanghai,Shenzhen,and Chongqing)were used to characterize their vertical distribution differences in four key regions,Jing–Jin–Ji(JJJ),Yangtze River Delta(YRD),Pearl River Delta(PRD),and Sichuan Basin(SB),*** normalized and yearly averaged aerosol vertical profiles below 400 m in JJJ and PRD exhibit a box shape and a Gaussian shape,respectively,and both show exponential shapes in YRD and *** NO_(2) vertical profiles in four regions all exhibit exponential shapes because of vehicle *** shape of the HCHO vertical profile in JJJ and PRD was Gaussian,whereas an exponential shape was shown in YRD and ***,a regional transport event occurred at an altitude of 600–1000 m was monitored in the southwest–northeast pathway of the North China Plain(NCP)by five MAX-DOAS stations(Shijiazhuang(SJZ),Wangdu(WD),Nancheng(NC),Chinese Academy of Meteorological Sciences(CAMS),and University of Chinese Academy of Sciences(UCAS))belonging to the above network

关键词： MAX-DOAS Stereoscopic monitoring Regional transport Ozone production Control strategy