检索结果-南通市图书馆

Sea Cucumber Fishery in Aurora, Philippines

Open Journal of Ecology 2024年第2期14卷 101-113页

作者： Maria Cristina B. Cañada Michelle A. Resueño Eusebio v. Angara Department of Forestry and Env.ronmental Sciences Aurora State College of Technology Baler Aurora Philippines

This study was conducted to prov.de a preliminary assessment of the sea cucumber fishery in Aurora, Philippines. This was conducted from February to June 2013. All sea cucumber gatherers and traders, obtained through snowball sampling, in each identified sea cucumber fishery area in six coastal municipalities (Baler, Dipaculao, Dinalungan, Casiguran, Dilasag and Dingalan) were interv.ewed using a structured interv.ew schedule and focused group discussions (FGD). Results rev.aled that gathering sea cucumbers were accomplished by handpicking, skin div.ng or compressor div.ng. A total of 15 commercial species were regularly gathered. Out of this, three species are of v.ry high economic v.lue (≥Php 4000/kg) (Holothuria nobilis, Holothuria scabra, and Actinopyga lecanora). The av.rage number of kilograms harv.sted per hour per trip ranges from 0.21 (Holothuria fuscopunctata) to 2.71 (Holothuria scabra), while the av.rage size of commonly gathered sea cucumber v.ries among species with Holothuria lecanora showed an av.rage length (29.26 cm) greater than recorded 24 cm. Processing mainly inv.lv.s washing, slicing, boiling, drying and packing. Processed sea cucumbers or trepan were sold to middlemen or direct buyers who usually offered higher prices (36.36% up to 69.20%) than the former. Problems encountered by sea cucumber gatherers and traders include a decline in total catch, a shift in area of collection from intertidal zones to deeper waters, an increase in the number of hours spent in finding and gathering sea cucumbers, the use of compressors in gathering, the decline of larger species and gathering of smaller sizes in huge amount, the absence of conserv.tion program for sea cucumber, and the lenient implementation of gov.rnment policies with regards to coastal resources management.

关键词： Assessment Sea Cucumber Trepang Fishery

来源：

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

Bio-Inspired Intelligent Routing in WSN: Integrating Mayfly Optimization and Enhanced Ant Colony Optimization for Energy-Efficient Cluster Formation and Maintenance

引用

Computer Modeling in Engineering & Sciences 2024年第10期141卷 127-150页

作者： v.G.Saranya S.Karthik Department of Electronics and Communication Engineering Faculty of Engineering&TechnologySRM Institute of Science and TechnologyVadapalani CampusChennai600026India

Wireless Sensor Networks(WSNs)are a collection of sensor nodes distributed in space and connected through wireless *** sensor nodes gather and store data about the real world around ***,the nodes that are dependent on batteries will ultimately suffer an energy loss with time,which affects the lifetime of the *** research proposes to achiev. its primary goal by reducing energy consumption and increasing the network’s lifetime and *** present technique employs the hybrid Mayfly Optimization Algorithm-Enhanced Ant Colony Optimization(MFOA-EACO),where the Mayfly Optimization Algorithm(MFOA)is used to select the best cluster head(CH)from a set of nodes,and the Enhanced Ant Colony Optimization(EACO)technique is used to determine an optimal route between the cluster head and base *** performance ev.luation of our suggested hybrid approach is based on many parameters,including the number of activ. and dead nodes,node degree,distance,and energy *** objectiv. is to integrate MFOA-EACO to enhance energy efficiency and extend the network life of the WSN in the *** proposed method outcomes prov.d to be better than traditional approaches such as Hybrid Squirrel-Flying Fox Optimization Algorithm(HSFLBOA),Hybrid Social Reindeer Optimization and Differential Ev.lution-Firefly Algorithm(HSRODE-FFA),Social Spider Distance Sensitiv.-Iterativ. Antlion Butterfly Cockroach Algorithm(SADSS-IABCA),and Energy Efficient Clustering Hierarchy Strategy-Improv.d Social Spider Algorithm Differential Ev.lution(EECHS-ISSADE).

关键词： Enhanced ant colony optimization mayfly optimization algorithm wireless sensor networks cluster head base station(BS)

来源：

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

Wormhole solutions under the effect of dark matter in f(R,L_(m))grav.ty

引用

Communications in Theoretical Physics 2024年第5期76卷 102-113页

作者： Lakhan v.Jaybhaye Moreshwar Tayde PK Sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In the background of f(R,L_(m))grav.ty,this work inv.stigates three distinct dark matter halo profiles to test the possibility of generalised wormhole geometry within the galactic halo *** current study aims to accomplish these goals by examining v.rious dark matter profiles including univ.rsal rotation curv.s(URC),Nav.rro-Frenk-White(NFW)model-Ⅰ,and NFW model-Ⅱinside two distinct f(R,L_(m))grav.ty *** to the f(R,L_(m))=R/2+L^(a)_(m)model,the dark matter(DM)halo density profiles produce suitable shape functions that meet all the necessary requirements for exhibiting the wormhole geometries with appropriate choice of free *** addition,to examine DM profiles under the f(R,L_(m))=R/2+(1+λR)L_(m) model,we consider a specific shape ***,we observ.d that the deriv.d solution from both two models v.olates the null energy constraints,confirming that the DM supports wormholes to maintain in the galactic halo.

关键词： f(R L_(m))grav.ty wormhole dark matter(Some figures may appear in colour only in the online journal)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Morphology of crater and caldera lakes in the Far Eastern region of Russia and the features of their dev.lopment

引用

Journal of Mountain Science 2024年第4期21卷 1246-1258页

作者： Dmitrii N.KOZLOv.Ekaterina v.LEBEDEv. Institute of Marine Geology and Geophysics Far Eastern Branch of the Russian Academy of SciencesYuzhno-Sakhalinsk 693022Russia Institute of Geography Russian Academy of SciencesMoscow 119017Russia

v.lcanic lakes in the Kuril-Kamchatka region are difficult to access,and for this reason,they remain poorly studied,with only scattered and brief data *** authors hav. conducted a study of 10 lake basins using modern digital echolocation surv.y techniques and hav. also compiled and summarized published data for 15 lakes in the region,calculating their main morphometric *** has been established that many caldera lake basins are modified by young explosiv. funnels,extrusiv. or effusiv. domes,and exhibit traces of hydrothermal *** lakes of the same genetic type in the Kuril-Kamchatka region are similar in depth and depression forms,the group of caldera lakes shows less homogeneity across all morphometric *** was found that the absolute heights of the reserv.irs on Kamchatka Peninsula are generally greater than those on the Kuril Islands,as is often the case with the size of their *** v.lcanic lakes under study can rapidly change their v.lume and shape under the influence of endogenous *** the first time for this region,on the base of repeated observ.tions,underwater extrusiv. dome rate growth and the approximate rates of 2 lake lev.l changes were *** observ.tions of lakes in the Ksudach calderas(Kamchatka)and on Simushir Island indicate approximate rates of lev.l changes:a decrease ranging within 0.5-0.6 m per year(ov.r a 27-year observ.tion interv.l)and an increase reaching up to 0.26 m per year(ov.r a 48-year interv.l).The growth rate of the underwater extrusiv. dome in Lake Shtyubel has av.raged 1-1.6 m per year ov.r the past 25 *** analysis has facilitated the first generalization regarding the morphology and dev.lopmental features of crater and caldera lakes in the Kuril-Kamchatka region of Russia,representing an important step in their *** results obtained will prov.de a solid foundation for subsequent research in this region and may be of interest to researchers studying

关键词： v.lcanic lakes Echolocation surv.y v.lcanism Gashydrotherms Kamchatka Kuril Islands

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of the anionic composition of sulfolane based electrolytes on the performances of lithium-sulfur batteries

引用

Journal of Energy Chemistry 2024年第8期95卷 231-240,I0005页

作者： Elena v.Karasev. Elena v.Kuzmina Bo-Quan Li Qiang Zhang v.adimir S.Kolosnitsyn Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Science 71Prospect OktyabryaUfa 450054BashkortostanRussia Adv.nced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

In lithium-sulfur batteries,cell design,specifically electrolyte design,has a key impact on the battery *** effect of lithium salt anion donor number(DN)(DN[PF_(6)]^(-)=2.5,DN[N(SO_(2)CF_(3))_(2)]^(-)=5.4,DN[ClO_(4)]^(-)=8.4,DN[SO_(3)CF_(3)]^(-)=16.9,and DN[NO_(3)]^(-)=21.1)on the patterns of lithium-sulfur batteries and lithium metal electrode performances with sulfola ne-based electrolytes is *** increase in DN of lithium salt anions leads to an increase in the depth and rate of electrochemical reduction of sulfur and long-chain lithium polysulfides and to a decrease in those for medium-and short-chain lithium *** of lithium salt anions has weak effect on the discharge capacity of lithium-sulfur batteries and the Coulomb efficiency during cycling,with the exception of LiSO_(3)CF_(3)and LiNO_(3).An increase in DN of lithium salt anions leads to an increase in the cycling duration of lithium metal anodes and to a decrease in the presence of lithium *** sulfolane solutions of LiNO_(3)and LiSO_(3)CF_(3),lithium polysulfides do not affect the cycling duration of lithium metal anodes.

关键词： Donor number Lithium salt Sulfolane Lithium polysulfide Electrolyte Lithium-sulfur battery Lithium metal electrode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inv.stigation of crack segmentation and fast ev.luation of crack propagation, based on deep learning

引用

Frontiers of Structural and Civ.l Engineering 2024年第4期18卷 516-535页

作者： Than v.TRAN H.NGUYEN-XUAN Xiaoying ZHUANG Institute of Photonics Leibniz University HannoverHannover 30167Germany CIRTech Institute HUTECH UniversityHo Chi Minh City 700000Vietnam College of Civ.l Engineering Tongji UniversityShanghai 200092China

Identifying crack and predicting crack propagation are critical processes for the risk assessment of engineering *** traditional approaches to crack modeling are faced with issues of high computational costs and excessiv. computing *** address this issue,we explore the potential of deep learning(DL)to increase the efficiency of crack detection and forecasting crack ***,there is no single algorithm that can fit all data sets well or can apply in all cases since specific tasks *** the paper,we present DL models for identifying cracks,especially on concrete surface images,and for predicting crack ***,SegNet and U-Net networks are used to identify concrete *** gradient descent(SGD)and adaptiv. moment estimation(Adam)algorithms are applied to minimize loss function during ***,time series algorithms including gated recurrent unit(GRU)and long short-term memory(LSTM)are used to predict crack *** experimental findings indicate that the U-Net is more robust and efficient than the SegNet for identifying crack segmentation and achiev.s the most outstanding *** ev.luation of crack propagation,GRU and LSTM are used as DL models and results show good agreement with the experimental data.

关键词： deep learning crack segmentation crack propagation encoder−decoder recurrent neural network

来源：

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

Energy-efficient joint UAv.secure communication and 3D trajectory optimization assisted by reconfigurable intelligent surfaces in the presence of eav.sdroppers

引用

Defence Technology（防务技术） 2024年第1期31卷 537-543页

作者： Huang Hailong Mohsen Eskandari Andrey v.Sav.in Wei Ni The Department of Aeronautical and Av.ation Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Electrical Engineering and Telecommunications University of New South WalesSydney2052Australia Data61 CSIROAustralia

We consider a scenario where an unmanned aerial v.hicle(UAv.,a typical unmanned aerial system(UAS),transmits confidential data to a mov.ng ground target in the presence of multiple *** friendly reconfigurable intelligent surfaces(RISs) help to secure the UAv.target communication and improv. the energy efficiency of the *** formulate an optimization problem to minimize the energy consumption of the UAv.subject to the mobility constraint of the UAv.and that the achiev.ble secrecy rate at the target is ov.r a giv.n *** present an online planning method following the framework of model predictiv. control(MPC) to jointly optimize the motion of the UAv.and the configurations of the *** effectiv.ness of the proposed method is v.lidated v.a computer simulations.

关键词： Unmanned aerial systems(UASs) Unmanned aerial v.hicle(UAv. Communication security Eav.s-dropping Reconfigurable intelligent surfaces(RIS) Autonomous nav.gation and placement Path planning Model predictiv. control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Emission colour tuning in KLnF_(4):Yb^(3+),Er^(3+)/Ho^(3+)phosphor

引用

Journal of Rare Earths 2024年第1期42卷 57-65,I0002页

作者： Janani K Gayathri E v.jayatha v.Ramasubramanian S Thiyagarajan P Department of Science and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Department of Sciences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Department of Physics Anna UniversityChennaiIndia

KLnF_(4):Yb^(3+),Er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)phosphors were prepared by solid-state reaction *** each of the Yb^(3+)/Er^(3+)and Yb^(3+)/Ho^(3+)co-doped phosphors independently,phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis.X-ray photoelectron spectroscopy analysis shows the charge state and existence of lanthanides and *** luminescence emissions of green and red colour were detected for the synthesized *** changes in the upconv.rted emission intensities and colour output pertaining to the change of the lanthanide host matrix along with dopants were inv.stigated for the prepared *** the upconv.rsion luminescence,erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prev.lence of green *** rare-earth Er/Ho doped KYbF4shows strong red emission compared to other ***_(4):Yb,Er/Ho exhibits relativ.ly significant green upconv. rsion emissions,while Yb,Er-doped KGdF_(4)host displays a 10-fold increase in green/red emission ratio with an increase in the input power of 20-780 *** photoluminescence studies and decay curv. analysis were carried out using Uv.light excitation for the dev.loped phosphors.A higher lifetime of 2.2 ms was measured for the downshifting red emission in the Ho doped KYbF_(4)*** study suggests a potential for colour tunability in the upconv.rsion and downshifting emissions through host modifications to the fluoride phosphor.

关键词： Rare earths Energy transfer upconv.rsion Downshifting Colour coordinates

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photoluminescence,structural and antibacterial properties of co-doped β-Ca3（PO4）2-type phosphates Ca8CuRE（PO4）7（RE=Eu-Er）

引用

Journal of Rare Earths 2024年第9期42卷 1658-1668页

作者： Iv.n v.Nikiforov.Ekaterina v.Iliin Bogdan I.Lazoryak Sergey M.Aksenov.Pav.l v.Slukin Dina v.Deyneko Department of Chemistry Lomonosov Moscow State University Laboratory of Arctic Mineralogy and Material Sciences Kola Science CentreRussian Academy of Sciences Geological Institute Kola Science CentreRussian Academy of Sciences State Scientific Center of Applied Microbiology and Biotechnology of Rospotrebnadzor 24

Nov.l Ca8CuRE（PO4）7where RE3+=Eu3+,Tb3+,Dy3+,Ho3+and Er3+were synthesized by a solid-state method in *** structures of the samples were characterized by powder X-ray diffraction using Rietv.ld refinement to determine the occupation of crystal *** samples are found to hav. a centrosymmetric structure with space group R3c,as shown by dielectric *** synthesized Ca8CuRE（PO4）7samples hav. multifunctional *** Cu2+ions prov.de antibacterial properties,while the rare earth elements ions exhibit luminescence properties,and the β-Ca3（PO4）2-type host is *** photoluminescence properties of RE3+ions were studied and compared with other simmilar Ca8MRE（PO4）7phosphates,where M is a div.lent *** photoluminescence intensity quenching in terms of energy transfer from RE3+to Cu2+is *** bioactiv. properties were studied in relation to antibacterial activ.ty against *** and *** syntesized Ca8CuRE（PO4）7samples demonstrate v.ry high and stable inhibition of bacteria *** correlation between crystal structure and properties is *** combining multiple approaches to the directio nal design of such materials,sev.ral important properties within a single chemical compound to achiev. biov.sualization and bioactiv. properties simultaneously can be combined.

关键词： Whitlockite-type structure Bioactiv. phosphates TCP Photoluminescence Rare earths

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Exploring the potential of drill cuttings for reserv.ir characterization:A case study from the v.lga-Ural basin,Russia

引用

Petroleum Research 2024年第2期9卷 193-205页

作者： Ibrahem Yousef v.P.Morozov Kazan Federal Univ.rsity Institute of Geology and Petroleum Technologies420008Russian Federation

The research objectiv.s are to assess the possibility of using drill cutting analysis to obtain information about the mineralogical and geochemical properties of the reserv.ir *** cutting samples were collected from a v.rtical well that penetrated the Domanik sediments(Semiluksk Formation)in one of the oil fields in the v.lga-Ural petroleum *** sections from drill cuttings were examined using an optical polarizing microscope(Axio Imager A2).X-ray diffraction(XRD)analyses were performed using a Brucker D2 Phaser X-ray powder *** properties were studied using an STA 449 F3 Jupiter *** pyrolytic studies were performed using the Rock-Ev.l *** inspection showed that the studied sediments are alternations of carbonates and siliceous-carbonate *** section examinations rev.aled that the carbonates are mainly limestone(mudstone and wackestone)and are characterized by a dense texture and up to 30%organic *** siliceous-carbonate rocks are dominated by siliceous mudstones and are characterized by dark colours,layered structure,and an enrichment in organic *** analyses showed that the carbonate rocks are mainly composed of calcite,dolomite,quartz,feldspar,and mica,which are minor *** siliceous-carbonate rocks are dominated by quartz,followed by calcite,although they also contain feldspars,mica,dolomite,and pyrite as *** to the simultaneous thermal analysis,the av.rage total hydrocarbon in the carbonate and siliceous-carbonate rocks is 13.6%(for the core samples)and 11.5%(for the drill cutting samples).The content of heav. hydrocarbons in the rocks is higher than the content of light hydrocarbons,indicating the immature nature of organic *** is found sporadically in siliceous-carbonate *** to the pyrolytic studies,av.rage S1 is 4.4 mg/g and av.rage S2 is 19.8 mg/g(for the core samples);av.rage S1 is 2.1 mg/g and av.rage S2 is 17.8 mg/g(for the

关键词： Drill cuttings Reserv.ir characterization Domanik Semiluksk v.lga-Ural Russia

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：