检索结果-南通市图书馆

Contrasting physical mechanisms of yellowfin tuna fluctuations between the western and eastern Indian Ocean

维普期刊数据库评论

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 Oceanology and Limnology 2024年第3期42卷 960-971页

作者： Peng lian Le GAO Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Ocean Dynamics and Climate Laoshan LaboratoryQingdao 266061China

As an economically critical pelagic migratory species,yellowfin tuna(Thunnus albacores,YFT)is very sensible to physical and environmental conditions,such as sea surface temperature(SST),ocean heat content(OHC),and the mixed layer depth(MLD).We investigated the impact of SST,OHC,and MLD on fluctuations of YFT catch in the western/eastern Indian Ocean using the long time series of 63-year environmental and YFT *** found that the impact of SST on YFT was heavily overestimated in the past,and MLD plays a more critical role in the YFT catch *** the MLD deepens(>34.8 m),SST was more influential in predicting the catches of YFT than OHC in the western Indian Ocean,and OHC was more critical to YFT than SST in the eastern Indian ***,when the MLD shallows(<34.8 m),MLD was more vital to predict the catch per unit effort(CPUE)of YFT than SST/OHC in the *** 2000,there was an asynchronous pattern of YFT CPUE induced by higher frequency variations and ocean hiatus of SST/OHC signals in the western and eastern Indian Oceans *** impact of the subsurface hiatus may induce the decrease of YFT in the eastern Indian *** above findings clarified a non-stationary relationship between the environmental factors and catches of YFT and provided new insights into variations in YFT abundance.

关键词： yellowfin tuna Indian Ocean sea surface temperature(SST) ocean heat content(OHC) mixed layer depth(MLD) hiatus

Application of Angular Momentum Theory to Constructing Basis Functions of Irreducible Representations of Icosahedral Group

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第2期20卷 166-175页

作者： lian-yong SchoolofChemistryandChemicalEngineering SouthwesternNormalUniversityChongqing400715P.R.China

A new method based on angular momentum theory was proposed to construct the basis functions of the irreducible representations(IRs) of point groups. The transformation coefficients, i. e., coefficients S, are the components of the eigenvectors of some Hermitian matrices, and can be made as real numbers for all pure rotation point groups. The general formula for coefficient S was deduced, and applied to constructing the basis functions of single-valued irreducible representations of icosahedral group from the spherical harmonics with angular momentum j≤7.

关键词： Irreducible representation Basis function I group Angular momentum

An Overview of the Dynamic Framework in Earth-System Model and Its Well-Posedness

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2023年第6期44卷 803-818页

作者： Ruxu lian Qingcun ZENG International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China School of Mathematics and Statistics North China University of Water Resources and Electric PowerZhengzhou 450046China

The well-posedness of the dynamic framework in earth-system model(ESM for short)is a common issue in earth sciences and *** this paper,the authors first introduce the research history and fundamental roles of the well-posedness of the dynamic framework in the ESM,emphasizing the three core components of ESM,i.e.,the atmospheric general circulation model(AGCM for short),land-surface model(LSM for short)and oceanic general circulation model(OGCM for short)and their ***,some research advances made by their own research group are ***,future research prospects are discussed.

关键词： Earth-System model Dynamic framework Well-posedness

Impacts of central-Pacific El Niño and physical drivers on eastern Pacific bigeye tuna

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第3期42卷 972-987页

Bigeye tuna Thunnus obesus is an important migratory species that forages deeply,and El Niño events highly influence its distribution in the eastern Pacific *** sea surface temperature is widely recognized as the main factor affecting bigeye tuna(BET)distribution during El Niño events,the roles of different types of El Niño and subsurface oceanic signals,such as ocean heat content and mixed layer depth,remain *** conducted A spatial-temporal analysis to investigate the relationship among BET distribution,El Niño events,and the underlying oceanic signals to address this knowledge *** used monthly purse seine fisheries data of BET in the eastern tropical Pacific Ocean(ETPO)from 1994 to 2012 and extracted the central-Pacific El Niño(CPEN)indices based on Niño 3 and Niño ***,we employed Explainable Artificial Intelligence(XAI)models to identify the main patterns and feature importance of the six environmental variables and used information flow analysis to determine the causality between the selected factors and BET ***,we analyzed Argo datasets to calculate the vertical,horizontal,and zonal mean temperature differences during CPEN and normal years to clarify the oceanic thermodynamic structure differences between the two types of *** findings reveal that BET distribution during the CPEN years is mainly driven by advection feedback of subsurface warmer thermal signals and vertically warmer habitats in the CPEN domain area,especially in high-yield fishing *** high frequency of CPEN events will likely lead to the westward shift of fisheries centers.

关键词： bigeye tuna central-Pacific El Niño(CPEN) ocean heat content Argo explainable artificial intelligence(XAI) information flow

Shadowing and Inverse Shadowing for C^1 Endomorphisms

维普期刊数据库评论

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 Mathematica Sinica,English Series 2006年第5期22卷 1321-1328页

作者： Yu Jun ZHU Jin lian ZHANG lian Fa HE College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 P. R. China School of Mathematical Sciences Peking University Beijing 100871 P. R. China

In this paper, we consider the shadowing and the inverse shadowing properties for C^1 endomorphisms. We show that near a hyperbolic set a C^1 endomorphism has the shadowing property, and a hyperbolic endomorphism has the inverse shadowing property with respect to a class of continuous methods. Moreover, each of these shadowing properties is also ＂uniform＂ with respect to C^1 perturbation.

关键词： shadowing property inverse shadowing property endomorphism Hyperbolic set

GENERALIZED RECIPROCAL THEOREMS AND THEIR APPLICATIONS

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2002年第2期23卷 203-210页

作者： FU Bao-lian(付宝连) Department of Civil Engineering and Mechanics Yanshan UniversityQinhuangdao066004 P R China

Generalized reciprocal theorems of non-coupled and coupled systems, which are valid for two deformed bodies with different constitutive relations are established by generalizing the idea of Betti's reciprocal theorem. When the constitutive relations of the two deformed bodies are all alike and linear elastic the generalized reciprocal theorem of non-coupled systems just becomes Betti's. Meanwhile the generalized reciprocal theorems are applied to simulate calculations in elasticity.

关键词： reciprocal theorem generalized reciprocal theorem non-coupled system coupled system

Studies on the Quantitative Structure-activity Relationship of Toxicity of Chlorophenol Serial Compounds in the ab initio Methods and Substitutive Position of Chlorine Atom (N_(PCS))

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第8期26卷 933-938页

作者： ZHENG Qing WANG lian-Sheng Chemistry ＆ Bioengineering College Yancheng Institute of Technology Yancheng Jiangsu 224003 China School of the Environment Nanjing University Nanjing Jiangsu 210093 China

20 Quantum chemical parameters of chlorophenol compounds were fully optimized by using B3LYP method on both 6-31G^＊ and 6-311G^＊ basis sets. These structural parameters are taken as theoretical descriptors, and the experimental data of 20 compounds＇ aquatic photogen toxicity（-lgEC50） are used to perform stepwise regression in order to obtain two predicted -lgEC50 correlation models whose correlation coefficients R^2 are respectively 0.9186 and 0.9567. In addition, parameters of chlorine atom＇s substitutive positions and their correlations （NPCs） are taken as descriptors to obtain another predicted -lgEC50 model with the correlation coefficient R2 of 0.9444. Correlation degree of each independent variable in the three models is verified by using variance inflation factors （VIF） and t value. In the cross-validation method, cross-validation coefficients q^2 of 3 models are respectively 0.8748, 0.9119 and 0.8993, which indicates that the relativity and prediction ability of this model are superior to those of the model obtained by topological and BLYP methods.

关键词： chlorophenol toxicity (-lgEC50) linear dissolving energy theory density functional theory (DFT) substitutive position of chlorine atom (NPCS) QSAR

State synchronization in process-oriented chaincode

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2019年第6期13卷 1166-1181页

作者： lian YU Wei-Tek TSAI School of Software&Microelectronics Peking UniversityBeijing 102600China State Key Laboratory of Software Development Environment School of Computer Science&EngineeringBeihang UniversityBeijing 100191China Comp. Info.and Dec.Systems EngineeringArizona State UniversityTempeAZ 85287USA

Business processes often involve operational processes,contracts,and *** modeling of such processes must address regulation monitoring and enforcement and maintain a reliable history of data for *** study proposes modeling business processes as chaincode(CC)on permissioned blockchains(BCs).The challenges encountered by the proposed approach are state synchronizations among distributed nodes(called authnodes)and realtime *** study separates CC executions from the state management of multiple BCs and demonstrates the validity of the proposed approach with a payment authorization system at a Chinese bank.

关键词： blockchains state synchronization chaincode permissioned blockchains concurrent block building

HYDRODYNAMICS THEORY AND CALCULATION IN WATER WAVE PUMP DESIGN

维普期刊数据库评论

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 Hydrodynamics 2005年第2期17卷 216-221页

作者： LIUYing-xue TAOYi LIUGao-lian ShanghaiInstituteofAppliedMathematicsandMechanics ShanghaiUniversityShanghai200072.China／／DepartmentofEnvironmentandEnergyEngineeringShanghaiInstituteofTechnologyShanghai200235China ShanghaiInstituteofAppliedMathematicsandMechanics ShanghaiUniversityShanghai200072China

This paper introduces the hydrodynamics theory related to water wave pump. Water wave pump is a new type pump, which uses the particular quality of water wave and re-divides the inflow energy to increase the pressure of one part of the inflow water with the rest water flowing away freely. The research and development of such a pump is of importance and significant value and profitable social interest in that it can fully utilize the residual energy of natural source in industrial and civil water circle systems. Through hydrodynamics research and calculation, a series of valid design parameters were obtained and the predicted results achieved.

关键词： water wave theory one-dimensional unsteady flow water hammer pump CFD