检索结果-南通市图书馆

Impact of atmospheric circulations on droughts and drought propagation over China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第8期67卷 2633-2648页

作者： Ziye gu Lei gu Jiabo YIN wei FANG Lihua XIONG Jun guO Ziyue ZENG Jun XIA School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of water Resources Engineering and Management Wuhan 430072China Changjiang River Scientific Research Institute Wuhan 430010China

The GRACE satellite mission provides a new approach for monitoring,tracking,and assessing drought conditions by detecting changes in Earth's gravitational fields and inversing signals of terrestrial water storage *** studies of terrestrial water storage anomalies related droughts paid rare attention to the behind atmospheric physical mechanisms,nor quantified the risk propagation patterns between terrestrial water storage deficits and hydrological or agricultural *** this study,we first extract terrestrial water storage(TwS) droughts,hydrological droughts,and agricultural droughts by using multiple variables including TwS from the GRACE/GRACE-FO satellites,runoff and soil moisture from the ERA5-Land reanalysis *** then identify key atmospheric and oceanic oscillation indices affecting water deficits by employing machine learning *** characterize the joint distributions between drought duration and severity by using the Copula function and quantify the risk propagation of hydrological and agricultural droughts to TwS *** results show that:(1) From 2002 to 2021,there is a significant decrasing trend of TwS in China;the wPIO group atmospheric circulation indices(sea surface temperature index within the western Pacific and Indian Ocean) contributes the most to ***,the sea surface temperature anomalies within the NINO 3.4 region as well as the western Pacific warm Pool area index show significantly positive correlation relationships with TwS in southern China;(2) The northwestern China,the Yangtze River basin,and the downstream of the Pearl River basin are the hotspots of TwS ***,the hotspots of hydrological droughts locate in northwestern China and the hotspots of agricultural droughts locate in South China and eastern Tibetan Plateau;(3) The elastic coefficients of hydrological droughts propagating to TwS droughts are higher than those of agricultural droughts,indicating that the TwS droughts

关键词： GRACE satellites Drought Drought propagation Atmospheric circulation Copula function

Q-homotopy analysis method for time-fractional Newell–whitehead equation and time-fractional generalized Hirota–Satsuma coupled KdV system

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第3期76卷 70-83页

作者： Di Liu Qiongya gu Lizhen wang Center for Nonlinear Studies School of MathematicsNorthwest UniversityXi'an710127China

In this paper,two types of fractional nonlinear equations in Caputo sense,time-fractional Newell–whitehead equation(FNwE)and time-fractional generalized Hirota–Satsuma coupled KdV system(HS-cKdVS),are investigated by means of the q-homotopy analysis method(q-HAM).The approximate solutions of the proposed equations are constructed in the form of a convergent series and are compared with the corresponding exact *** to the presence of the auxiliary parameter h in this method,just a few terms of the series solution are required in order to obtain better *** the sake of visualization,the numerical results obtained in this paper are graphically displayed with the help of Maple.

关键词： fractional Newell-whitehead equation fractional generalized Hirota-Satsuma coupled KdV system approximate solution q-homotopy analysis method

Recent advances of versatile reagents as controllable building blocks in organic synthesis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 24-43页

作者： Shaomin Chen Luigi Vaccaro Yanlong gu Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Laboratory of Green S.O.C. Dipartimento di ChimicaBiologia e BiotecnologieUniversità degli Studi di PerugiaVia Elce di Sotto 8Perugia 06123Italy School of Chemistry and Chemical Engineering The Key Laboratory for Green Processing of Chemical Engineering of Xinjiang BingtuanShihezi UniversityShihezi 832004China

Diversity-oriented synthesis is a powerful and interesting synthetic tool for the rapid construction of structurally complex and privileged scaffolds from readily accessible starting *** date,diversity-oriented synthesis mostly relies on the employment of versatile *** reagents can be regulated as controllable and flexible building blocks for multipurpose *** the past decade,a variety of multifunctional reagents have been ***,most versatile reagents usually need multi-step synthesis,thus restricting their wide application to a large *** terms of the practicalities and universalities,we prefer to pay more attention to the utilization of simple and practical versatile reagents with multiple reactivities,mainly including atropaldehyde acetals,aryl methyl ketones,vinylene carbonate,vinyl azides,aryldiazonium salts,rongalite,halodifluoromethyl *** importantly,these versatile reagents can also play different roles simultaneously in the same reaction,in which their different reactivities are converged into the final target *** strategy can not only offer more possibilities for the synthesis of several active pharmaceutical ingredients,but also minimize the occurrence of some side reactions by lessening the varieties of ***,a perspective is given at the end of this review.

关键词： Versatile reagents Divergent synthesis Dual synthons Bond cleavage Tandem reactions

Self-attention guidance Based Crowd Localization and Counting

在线全文

学校读者我要写书评

暂无评论

Machine Intelligence Research 2024年第5期21卷 966-982页

作者： Zhouzhou Ma guanghua gu wenrui Zhao School of Information Science and Engineering Yanshan UniversityQinhuangdao066000China Hebei Key Laboratory of Information Transmission and Signal Processing Qinhuangdao066000China

Most existing studies on crowd analysis are limited to the level of counting,which cannot provide the exact location of *** paper proposes a self-attention guidance based crowd localization and counting network(SA-CLCN),which can simultaneously locate and count *** take the form of object detection,using the original point annotations of crowd datasets as supervision to train the ***,the center point coordinate of each head as well as the number of crowds are ***,to cope with the spatial and positional variations of the crowd,the proposed method introduces transformer to construct a globallocal feature extractor(GLFE)together with the convolutional *** establishes the near-to-far dependency between elements so that the global context and local detail features of the crowd image can be extracted ***,this paper designs a pyramid feature fusion module(PFFM)to fuse the global and local information from high level to low level to obtain a multiscale feature *** downstream tasks,this paper predicts candidate point offsets and confidence scores by a simple regression header and classification *** addition,the Hungarian algorithm is used to match the predicted point set and the labelled point set to facilitate the calculation of *** proposed network avoids the errors or higher costs associated with using traditional density maps or bounding box ***,we have conducted extensive experiments on several crowd datasets,and the proposed method has produced competitive results in both counting and localization.

关键词： Crowd localization crowd counting transformer point supervision object detection

Bispecific antibody drug conjugates:Making 1+1>2

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第5期14卷 1965-1986页

作者： Yilin gu Zhijia wang Yuxi wang Targeted Tracer Research and Development Laboratory Institute of Respiratory HealthFrontiers Science Center for Disease-Related Molecular NetworkNational Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengdu 610041China Frontiers Medical Center Tianfu Jincheng LaboratoryChengdu 610212China

Bispecific antibody‒drug conjugates(BsADCs)represent an innovative therapeutic category amalgamating the merits of antibody‒drug conjugates(ADCs)and bispecific antibodies(BsAbs).Positioned as the next-generation ADC approach,BsADCs hold promise for ameliorating extant clinical challenges associated with ADCs,particularly pertaining to issues such as poor internalization,off-target toxicity,and drug ***,ten BsADCs are undergoing clinical trials,and initial findings underscore the imperative for ongoing *** review initially delves into specific design considerations for BsADCs,encompassing target selection,antibody formats,and the linker–payload *** sections delineate the extant progress and challenges encountered by BsADCs,illustrated through pertinent case *** amalgamation of BsAbs with ADCs offers a prospective solution to prevailing clinical limitations of ***,the symbiotic interplay among BsAb,linker,and payload necessitates further optimizations and coordination beyond a simplistic“1+1”to effectively surmount the extant challenges facing the BsADC domain.

关键词： Bispecific antibody drug conjugates Antibody drug conjugates Bispecific antibody Targeted therapy Safety HER2 EGFR

Efficient energy transfer from self-trapped excitons to Mn^(2+) dopants in CsCdCl_(3):Mn^(2+) perovskite nanocrystals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1456-1461页

作者： Anran Zhang Xinquan Zhou Ranran gu Zhiguo Xia State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China

Mn^(2+)doping has been adopted as an efficient approach to regulating the luminescence properties of halide perovskite nano-crystals(NCs).However,it is still difficult to understand the interplay of Mn^(2+)luminescence and the matrix self-trapped exciton(STE)emission *** this study,Mn^(2+)-doped CsCdCl_(3) NCs are prepared by hot injection,in which CsCdCl_(3) is selected because of its unique crystal structure suitable for STE *** blue emission at 441 nm of undoped CsCdCl_(3) NCs originates from the defect states in the ***^(2+)doping promotes lattice distortion of CsCdCl_(3) and generates bright orange-red light emission at 656 *** en-ergy transfer from the STEs of CsCdCl_(3) to the excited levels of the Mn^(2+)ion is confirmed to be a significant factor in achieving efficient luminescence in CsCdCl_(3):Mn^(2+)*** work highlights the crucial role of energy transfer from STEs to Mn^(2+)dopants in Mn^(2+)-doped halide NCs and lays the groundwork for modifying the luminescence of other metal halide perovskite NCs.

关键词： perovskite nanocrystals self-trapped excitons luminescence energy transfer

Vectorial adaptive optics:expanding the frontiers of optical correction

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第2期13卷 170-171页

作者： Qiming Zhang Min gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai200093China

Researchers at the University of Oxford have introduced a groundbreaking technique called vectorial adaptive optics(V-AO),which extends the capabilities of traditional adaptive optics to correct for both polarization and phase *** novel approach opens new possibilities for manipulating the complex vectorial field in optical systems,enabling higher-dimensional feedback correction.

关键词： optics correction frontier

Nuclear transport receptors underpin plastidial retrograde signaling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2024年第7期17卷 993-995页

作者： Min Jia Yangnan gu Department of Plant and Microbial Biology University of CaliforniaBerkeleyBerkeleyCAUSA

The nucleus integrates cytosolic and organellar signals to regulate gene expression during plant stress responses,and this process is highly dependent on shuttling of signaling molecules in and out of the *** nucleocytoplasmic transport of macromolecules is facilitated by nuclear transport receptors(NTRs).NTRs are broadly categorized into exportins,which mediate the export of cargo from the nucleus to the cytoplasm,and importins,which facilitate the import of cargo into the *** importin family comprises importin-α(IMPa)and importin-β(IMPp).IMPa proteins are adaptor proteins and composed of three functional domains:an N-terminal IMPβ-binding(IBB)domain,ten Armadillo(ARM)repeats responsible for recognizing and interacting with cargo,and an exportin-interacting domain crucial for recycling via nuclear export(wing et al.,2022).During a nuclear transport event,*** cargo containing a classical nuclear localization signal(cNLS)through its ARM repeats and engages IMPβvia its IBB domain,forming the cargo-IMPa-IMPβternary ***βfacilitates translocation of this complex through the nuclear *** inside the nucleus,RanGTP competes with IMPa for binding to IMPβ,promoting disassembly of the transport complex and releaseofcargo.

关键词： complex. integrate ternary

Research on concrete structure defect repair based on three-dimensional printing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第5期18卷 731-742页

作者： Yang gu wei LI Xupeng YAO guangjun LIU School of Mechanical Engineering Tongji UniversityShanghai 201804China College of Civil Engineering Tongji UniversityShanghai 200092China Shanghai Engineering Research Center for Safety Intelligent Control of Building Machinery Shanghai 200032China

Quality assurance and maintenance play a crucial role in engineering construction,as they have a significant impact on project *** common issue in concrete structures is the presence of *** enhance the automation level of concrete defect repairs,this study proposes a computer vision-based robotic system,which is based on three-dimensional(3D)printing technology to repair *** system integrates multiple sensors such as light detection and ranging(LiDAR)and *** is utilized to model concrete pipelines and obtain geometric parameters regarding their ***,a convolutional neural network(CNN)is employed with a depth camera to locate defects in concrete ***,a method for coordinate transformation is presented to convert the obtained coordinates into executable ones for a robotic ***,the feasibility of this concrete defect repair method is validated through simulation and experiments.

关键词： concrete defect detection 3D printing deep learning point cloud data