检索结果-南通市图书馆

An unprecedented high temperature event in southern China in autumn 2021 and the essential role of the mid-latitude trough

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2022年第6期13卷 772-777页

作者： Ting DING xiang LI Hui gao Climate Studies Key Laboratory National Climate CenterChina Meteorological AdministrationBeijing 100081China

Studies about high temperatures in China rarely touched the period beyond *** in September-early October 2021,a record-breaking high temperature event occurred in southern China,and affected agriculture in many *** the daily maximum temperature and the number of high temperature days were the highest in September since *** better understand the different features and possible causes of the extreme event in autumn from those in summer,the analysis of atmospheric circulation patterns was *** western Pacific subtropical high(WPSH)was quite stronger and extended much more westward in most of the days in September 2021 than its climatology,which directly caused this unprecedented autumn high temperature ***,the mid-latitude trough over the east of Japan may also play an essential role in this high temperature *** to the southward extension of the trough,a cyclonic circulation anomaly appeared at 850 hPa,and its northerly wind component prevailed in the west of the trough and blocked the eastward retreat of the *** a result,southern China was stably controlled by the WPSH,which led to the persistence of this high temperature *** conclusion is further confirmed by the statistical results from the analysis of the multi-year data and analogue *** to the previous studies,this study reveals the essential role of the mid-latitude trough and highlights the joint impacts of the WPSH and the trough in causing the unprecedented autumn high temperature event.

关键词： Extreme high temperature Western Pacific subtropical high Mid-latitude trough Southern China

An over review of desertification in Xinjiang,Northwest China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Arid Land 2022年第11期14卷 1181-1195页

作者： YU xiang LEI Jiaqiang gao Xin State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China

Desertification research in arid and semi-arid regions has always been actively *** China,the problem of desertification in Xinjiang has also received extensive *** to its unique geography,many scholars have conducted corresponding research on the desertification status of *** this paper,we comprehensively reviewed desertification in Xinjiang,and compared the underlying mechanisms of desertification and the status of desertification conditions after the implementation of ecological control *** a larger scale,desertification in Xinjiang can be divided into soil salinization inside oases and sandy desertification on the edges of *** activities are considered the main cause of desertification,but natural factors also contribute to varying *** on the mechanisms of desertification has effectively curbed the development of desertification,but unreasonable use of land resources accelerates the risk of *** desertification control,there are several key ***,desertification monitoring and the early warning of desertification expansion should be ***,monitoring and reversing soil salinization also play an important role in the interruption of desertification *** is very effective to control soil salinization through biological and chemical ***,the management of water resources is also essential,because unreasonable utilization of water resources is one of the main reasons for the expansion of desertification in *** to the unreasonable utilization of water resources,the lower reaches of the Tarim River are cut off,which leads to a series of vicious cycles,such as the deterioration of ecological environment on both sides of the river and the worsening of ***,in recent years,various desertification control projects implemented in Xinjiang according to the conditions of different regions have achieved remarkable *** future studies,resea

关键词： desertification soil salinization sandy desertification desertification control soil wind erosion human activities Tarim Basin

Environmental consequences of an ultra-low emission retrofit in coal-fired power plants from a life cycle perspective

在线全文

学校读者我要写书评

暂无评论

Waste Disposal and Sustainable Energy 2021年第4期3卷 309-323页

作者： Jun Dong Yuanjun Tang Aizhong Ruan Jie Chen Xiaoqing Lin Shengyong lu xiang gao State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Zhejiang Energy R&D Institute Co. Ltd.Hangzhou 311121China Key Laboratory of Energy Conservation and Pollutant Control Technology for Thermal Power of Zhejiang Province Hangzhou 311121China Department of Energy and Environment System Engineering Zhejiang University of Science and TechnologyHangzhou 310023China Zhejiang Shengyuan Environmental Testing Technology Co. Ltd.Shaoxing 311899China

To make coal-fired power generation more environmentally friendly,China has initiated a series of ultra-low emission ret-rofits to the air pollution control(APC)system of the existing power *** this study,a life cycle assessment(LCA)is conducted to analyze the environmental net benefits for the typical ultra-low emission retrofit of a 1000 MW power *** key processes,substances,and APC devices are verified and *** results confirm that the retrofit effectively decreases the environmental stress of acidification potential(AP),eutrophication potential(EP),and photochemical ozone creation potential(POCP)by 69%-79%,which can be attributed to significantly reduced emissions at the ***,the retrofit has also increased other impact categories by 24%-79%,primarily due to the consumption of additional elec-tricity and *** retrofit of selective catalytic reduction,electrostatic precipitator(ESP),and wet limestone flue gas desulfurization devices has a dominant effect on the impacts of EP,human toxicity potential(HTP),and AP.A newly installed wet ESP shows some environmental benefits(only for AP),but causes considerable burdens,in particular for the investigated impact categories global warming potential(GWP),marine aquatic ecotoxicity(MAETP),and abiotic depletion fossil(ADP fossil).The obtained results indicate that the hidden environmental consequences,which are associated with the production of energy and materials,need to be examined more comprehensively to inform the development of ultra-low emission technologies and strategies effectively.

关键词： Ultra-low emission retrofit Life cycle assessment Air pollution control system Coal-fired power plants Environmental impacts

Microstructuring Conductive Electrospun Mats for Enhanced Electro‑active Biofilm Growth and High‑Performance Bioelectrocatalysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advanced Fiber Materials 2023年第5期5卷 1699-1711页

作者： Min Li Hao lu Jiadong Hu Xuemei xiang Yanling Zheng Wenhu gao Wei Sun Wei Wang Zhisong lu Yan Qiao Institute for Clean Energy and Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Sino‑Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Experimental Center for Virtual Simulation of Sports and Health Southwest UniversityChongqing 400715People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University TechnologyWuhan 430070People’s Republic of China Hubei Longzhong Lab Xiangyang 441000People’s Republic of China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158People’s Republic of China Singapore Institute of Manufacturing Technology Singapore 138669Singapore

Electrospun materials have attracted considerable attention in microbial fuel cells(MFC)owing to their porous structures,which facilitate the growth of electro-active biofilms(EABs).However,the impact of fiber diameter-controlled porous architectures on EAB growth and MFC performance has not been extensively ***,a highly conductive polypyrrole-modified electrospun polyacrylonitrile(PAN)mat was prepared as an electrode material for Shewanella putrefaciens CN32-based *** dominant pore size of the corresponding mat increases from 1 to around 20μm as the fiber diameter increases from 720 to 3770 *** variation affects the adhesion and growth behaviors of electrochemically active bacteria on the mat-based *** electrodes with poresranging from 2 to 10μm allow bacterial penetration into the interior,leading to significant biofilm loading and effective ***,the tight lamination of the electrospun fibers restricts bacterial growth in the deep interior *** developed a friction-induced triboelectric expanding approach to rendering the mats with layered structures to overcome this *** inter-layer spaces of the expanded conductive mat can facilitate bacterial loading from both sides of each layer and serve as channels to accelerate the catalysis of organic ***,the expanded conductive mat with appropriate pore sizes delivers superior bioelectrocatalytic performance in MFCs and dye *** on the findings,a mechanism for the porous structure-controlled EAB formation and bioelectrocatalytic performance was *** work may provide helpful guidance and insights for designing microfiber-based electrodes for microbial fuel cells.

关键词： Electrospun mat Porous structure Bioelectrocatalysis Microbial fuel cells Polypyrrole

A single mutation in the PBC loop of VP2 is involved in the in vitro replication of infectious bursal disease virus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2016年第7期59卷 717-723页

作者： Xiaole Qi xiang gao Zhen lu Lizhou Zhang Yongqiang Wang Li gao Yulong gao Kai Li Honglei gao Changjun Liu Hongyu Cui Yanping Zhanga Xiaomei Wang Division of Avian Infectious Diseases State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research Institute Chinese Academy of Agricultural Sciences Harbin 150001 China Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses Yangzhou 225009 China

To test whether amino acid mutations in the PBC and PHI loops of VP2 are involved in the replication and virulence of infectious bursal disease virus(IBDV), a pair of viruses, namely the moderately virulent IBDV(rG x-F9VP2) and the attenuated strain(rGt), were used. Residue mutations A222P(P_(BC)) and S330R(PHI), selected by sequence comparison, were introduced individually into r Gx-F9VP2 by using a reverse genetics system. In addition, the reverse mutation of either P222 A or R330 S was introduced into r Gt. The four modified viruses were then rescued and evaluated in vitro(CEF cells) and in vivo(SPF chickens). Results showed that A222 P elevated the replication efficiency of rG x-F9VP2 while P222 A reduced that of rG t in CEF cells. A mutation at residue 330 did not alter IBDV replication. In addition, animal experiments showed that a single mutation at either residue 222 or 330 did not significantly influence the virulence of IBDV. In conclusion, residue 222 in PBC of VP2 is involved in the replication efficiency of IBDV in vitro but does not affect its virulence in vivo, further facilitating our understanding of the gene-function of IBDV.

关键词： infectious bursal disease virus (IBDV) VP2 Puc replication

Unveiling the chemistry behind the electrolytic production of hydrogen peroxide by oxygenated carbon

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第9期96卷 49-58页

作者： Pan xiang Kunshang Yang Qihao Yang Yang gao Wenwen Xu Zhiyi lu Liang Chen Zhiming Wang Ziqi Tian Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201ZhejiangChina Institute for Advanced Study Chengdu UniversityChengdu 610106SichuanChina

Oxygenated carbon materials exhibit outstanding electrocatalytic performance in the production of hydrogen peroxide(H2O2)through a two-electron oxygen reduction *** nature of the active functional group and underlying reaction mechanism,however,remain ***,a comprehensive workflow was established to identify the active sites from the numerous possible *** common hydroxyl group at the notched edge demonstrates a key role in the two-electron *** local chemical environment weakens the binding of OOH intermediate to substrate while enhancing interaction with solution,thereby promoting the H_(2)O_(2)*** increasing pH,the intramolecular hydrogen bond between OOH intermediate and hydroxyl decreases,facilitating OOH ***,the rise in selectivity with increasing potential stems from the suppression of the four-electron *** active site was further validated through *** by theoretical understanding,optimal performance was achieved with high selectivity(>95%)and current density(2.06 mA/cm^(2))in experiment.

关键词： First-principles calculation Oxygen reductionreaction Hydrogen peroxide production Fixed-potential method Oxygenated carbon materials

Recent progress on pure organic room temperature phosphorescent polymers

在线全文

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2021年第4期2卷 87-99页

作者： Hao gao xiang Ma Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghaiChina

So far,pure organic room temperature phosphorescence(RTP)materials are developing rapidly and have become a research hotspot in the scientific *** are regarded as valuable resources with great potential for development in many fields,such as biomedicine,information multi-level encryption,smart anticounterfeiting,and so *** them,a series of pure organic RTP polymer systems emerged at the right moment based on the excellent properties of polymers such as easy processing,low cost,and good ***,the huge molecular weight,long-chain intertwined structure,and potential interactions with phosphors of polymers make them a focus for RTP ***,we describe the development history of this system in detail,explore the necessary factors for highly efficient emission from the phosphorescence emission process,and based on the dual effects of enhancing phosphorescence emission and shortening luminescence lifetime brought by heavy atoms,we summarize the internal mechanism and achievements of various researches from the perspective of heavy atom–containing and non-heavy atom systems.

关键词： heavy atom effect room temperature phosphorescence polymer

Microscopic damage mechanism of SA508 Gr3 steel in ultra-high temperature creep

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2018年第4期25卷 453-459页

作者： Zhi-gang Xie Yan-ming He Jian-guo Yang xiang-qing Li Chuan-yang lu Zeng-liang gao Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou 310014 Zhejiang China Mechanical and Electrical Department Shantou Polytechnic College Shantou 515078 Guangdong China

The lower head of reactor pressure vessel （RPV） will endure a great temperature gradient above the phase transition temperature, and the creep and fracture will be the primary failure mode for the RPV material in such a situation. The interrupted creep tests were performed on a typical RPV material, SA508 Gr3 steel, at 800 ℃. The microstructure of different creep stages was examined by scanning electron microscopy and transmission electron microscopy. The results showed that the microscopic damage is mainly induced by creep cavities and coarse second-phase particles. Furthermore, the volume fractions of creep cavities and coarse second-phase particles show a linear relationship with the extended creep time. The second-phase particles are determined to be MoC in the second creep stage and Mo2C in the third creep stage, according to the results of selected-area electron diffraction pattern. Combined with energy-dispersive spectrum analysis, the segregation of precipitates caused by the migration of atoms is finally unveiled, which leads to the coarsening of the particles.

关键词： Reactor pressure vessel SA508 Gr3 steel In-vessel retention. Second-phase particle Damage mechanism Ultra-high temperature creep

Trade Destruction and Trade Deflection:A Quasi-Natural Experiment Based on the US Additional Tariffs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2023年第6期36卷 2467-2496页

作者： ZHANG Yu gao xiang XU Ran YANG Cuihong Yangtze Industrial Economic Institute Nanjing UniversityNanjing210093China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing100190China School of Management Engineering Qingdao University of TechnologyQingdao266520China

This paper adopts the DID approach to investigate the trade destruction effects and trade deflection effects of the US additional *** authors find that the US additional tariffs significantly reduce China's exports of tariffed products to the US(i.e.,trade destruction effect),especially intermediate and labor-intensive *** the other hand,they significantly increase China's exports of tariffed products to the third market(i.e.,trade deflection effect).For the$50 billion list,both the trade destruction effect and trade deflection effect are concentrated on processing exports,and the US additional tariffs significantly increase China's exports of tariffed products to ASEAN,Japan and *** the$200 billion list,the US additional tariffs boost China's exports of chemicals,textiles,wood,metal products,furniture and other products to the EU,Australia,Japan,South Africa and Hong Kong,***,most trade deflections are not realized by lowering export prices,indicating that the trade deflections could compensate for the profit losses caused by the US additional tariffs to a certain *** proposed results suggest that searching for substitutions of export markets and a more open trade policy is an important way to avoid profit losses and reduce risks for enterprises and economies suffering from trade frictions.

关键词： DID approach trade deflection trade destruction US additional tariffs