检索结果-南通市图书馆

novel Approach to Minimize the Memory Requirements of Frequent Subgraph Mining Techniques

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Electronics 2021年第2期30卷 258-267页

作者： b?LG?n Turgay Tugay O?UZ Murat Department of computer Engineering Bursa Technical University Microsoft corporation Turkey branch

Frequent subgraph mining(FSM) is a subset of the graph mining domain that is extensively used for graph classification and clustering. Over the past decade, many efficient FSM algorithms have been developed with improvements generally focused on reducing the time complexity by changing the algorithm structure or using parallel programming techniques. FSM algorithms also require high memory consumption, which is another problem that should be solved. In this paper, we propose a new approach called Predictive dynamic sized structure packing(PDSSP) to minimize the memory needs of FSM algorithms. Our approach redesigns the internal data structures of FSM algorithms without making algorithmic modifications. PDSSP offers two contributions. The first is the Dynamic Sized Integer Type, a newly designed unsigned integer data type, and the second is a data structure packing technique to change the behavior of the compiler. We examined the effectiveness and efficiency of the PDSSP approach by experimentally embedding it into two state-of-the-art algorithms, g Span and *** compared our implementations to the performance of the originals. nearly all results show that our proposed implementation consumes less memory at each support level, suggesting that PDSSP extensions could save memory, with peak memory usage decreasing up to 38% depending on the dataset.

关键词： data structures algorithmic modifications high memory consumption graph mining domain Dynamic Sized Integer Type Predictive dynamic sized structure packing internal data structures graph classification parallel programming peak memory usage memory requirements PDSSP extensions finite state machines graph theory PDSSP approach algorithm structure newly designed unsigned integer data type data mining data structure packing technique efficient FSM algorithms clustering frequent subgraph mining techniques

Hydrological impacts of afforestation-A review of research in India

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2014年第1期25卷 37-42页

作者： b.Venkatesh n.Lakshman b.K.Purandara Regional centre National Institute of Hydrology Department of Applied Mechanics National Institute of Technology Karnataka

We review the current status of experimental studies in India to understand the linkages between afforestation and hydrology. This discipline deals with the use and management of water, social awareness of environmental problems, and ecosystem limitations on provision of watershed services by river basins in the mountain regions of India. Our review begins with examination of experimental works in tropical countries and proceeds to discussion of initiatives of Indian research institutes and Government organizations towards establishing experimental watersheds to understand the impacts of land cover changes on hydrologic regimes in the Indian sub-continent. This is followed by the review of the experimental work carried out by various authors to assess the impact of land cover changes on major water balance components such as, runoff, groundwater, evapotranspiration and sediment yield. The spatial scales of these experiments have been limited to small watersheds or field plots. This paper also describes impacts of human interventions （such as planta- tions of exotic forest species to restore degraded landscapes） on the water balance components in diverse hydro-geo-environmental conditions in the Indian sub-continent. We focus on identifying the research areas which require immediate attention to develop tools to assist planners and policy makers in assessing and managing the water resources in these complex environments. The review is largely based on research results reported during the last 20 to 30 years.

关键词： afforestation Western Ghats experimental watersheds land-use/cover changes humid tropics

Er-doped concentric-cores optical fiber for simultaneous amplification and compensation of positive dispersion

在线全文

学校读者我要写书评

暂无评论

chinese Optics Letters 2004年第1期2卷 12-14页

作者： P.ramodR.Watekar M.L.n.Goswami H.n.Acharya J.c.biswas b.P.Pal OpticalFiberUnit CRFandDepartmentofPhysicsandMeteorology DepartmentofElectronicsandElectricalcommunicationEngineering IndianInstituteofTechnologyKharagpur-721302India DepartmentofPhysics IndianInstituteofTechnologyNewDelhi-11O016India

The Er-doped concentric-cores dispersion compensating fiber (EDDcF) has been demonstrated. The rare earth has been doped as a ring around the inner core. We have obtained 14-db gain at 1550 nm (using 100-mW pump power and 980-nm wavelength) with dispersion of about -165 ps/(km·nm). It is useful for the optical fiber network where amplification as well as negative dispersion are necessary.

关键词： nm Er-doped concentric-cores optical fiber for simultaneous amplification and compensation of positive dispersion McVD

Structural and mass transport properties of liquid ytterbium in the temperature range 1123 K–1473 K

在线全文

学校读者我要写书评

暂无评论

chinese Physics b 2023年第6期32卷 481-488页

作者： D D Satikunvar n K bhatt b Y Thakore Department of Physics Sardar Patel UniversityVallabh VidyanagarGujarat 388120India Department of Physics Maharaja Krishnakumarsinhji Bhavnagar UniversityBhavnagarGujarat 364001India

We have studied the structural and atomic transport properties of liquid f-shell Yb in the temperature range 1123 K–1473 K. Pair interactions between atoms are derived using a local pseudopotential. The potential parameters are fitted to the phonon dispersion curve at room temperature. The local pseudopotential used in the present study is computationally more efficient with only three parameters, and it is found to be transferable to the liquid phase without changing the *** the various computed properties agree with reported theoretical and experimental findings, the adopted fitting scheme is justified. As a significant outcome of the study, we find that(i) the melting in Yb is governed by the Lindemann's law,(ii)the mass transport mechanism obeys the Arrhenius law,(iii) the role of the three-particle correlation function in deriving the velocity autocorrelation function is small,(iv) the mean-square atomic displacement is more sensitive to the choice of interaction potential than the other bulk properties, and(v) liquid Yb does not show liquid–liquid phase transition within the studied temperature range. Further, due to the good description of the structural and mass transport properties, we propose that Yb remains divalent at reduced density.

关键词： transport properties pseudopotential single-particle dynamics ytterbium

Heat transfer and entropy generation analysis of non-newtonian fluid flow through vertical microchannel with convective boundary condition

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2019年第9期40卷 1285-1300页

作者： M. MADHU n. S. SHASHIKUMAR b. MAHAnTHESH b. J. GIREESHA n. KISHAn Department of Studies and Research in Mathematics Kuvempu University Shankaraghatta 577451 India Department of Mathematics Christ Deemed to be University Bangalore 560029 India Department of Mathematics Osmania University Telangana 500007 India

The entropy generation and heat transfer characteristics of magnetohydrodynamic (MHD) third-grade fluid flow through a vertical porous microchannel with a convective boundary condition are analyzed. Entropy generation due to flow of MHD non-newtonian third-grade fluid within a microchannel and temperature-dependent viscosity is studied using the entropy generation rate and Vogel's model. The equations describing flow and heat transport along with boundary conditions are first made dimensionless using proper non-dimensional transformations and then solved numerically via the finite element method (FEM). An appropriate comparison is made with the previously published results in the literature as a limiting case of the considered problem. The comparison confirms excellent agreement. The effects of the Grashof number, the Hartmann number, the biot number, the exponential space-and thermal-dependent heat source (ESHS/THS) parameters, and the viscous dissipation parameter on the temperature and velocity are studied and presented graphically. The entropy generation and the bejan number are also calculated. From the comprehensive parametric study, it is recognized that the production of entropy can be improved with convective heating and viscous dissipation aspects. It is also found that the ESHS aspect dominates the THS aspect.

关键词： microchannel entropy generation bejan number third-grade fluid magnetic field

brain-derived neurotrophic factor signaling in the neuromuscular junction during developmental axonal competition and synapse elimination

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第2期20卷 394-401页

作者： Josep Tomàs Víctor cilleros-Mañé Laia Just-borràs Marta balanyà-Segura Aleksandra Polishchuk Laura nadal Marta Tomàs carolina Silvera-Simón Manel M.Santafé Maria A.Lanuza Unitat d’Histologia i neurobiologia(UHneurob) Facultat de Medicina i Ciències de la SalutUniversitat Rovira i VirgiliReusSpain

During the development of the nervous system,there is an overproduction of neurons and *** competition between neighboring nerve endings and synapses performing different activity levels leads to their elimination or *** have extensively studied the involvement of the brain-derived neurotrophic factor-Tropomyosin-related kinase b receptor neurotrophic retrograde pathway,at the neuromuscular junction,in the axonal development and synapse elimination process versus the synapse *** purpose of this review is to describe the neurotrophic influence on developmental synapse elimination,in relation to other molecular pathways that we and others have found to regulate this *** particular,we summarize our published results based on transmitter release analysis and axonal counts to show the different involvement of the presynaptic acetylcholine muscarinic autoreceptors,coupled to downstream serine-threonine protein kinases A and c(PKA and PKc)and voltage-gated calcium channels,at different nerve endings in developmental *** dynamic changes that occur simultaneously in several nerve terminals and synapses converge across a postsynaptic site,influence each other,and require careful studies to individualize the mechanisms of specific *** describe an activity-dependent balance(related to the extent of transmitter release)between the presynaptic muscarinic subtypes and the neurotrophin-mediated Trkb/p75nTR pathways that can influence the timing and fate of the competitive interactions between the different axon *** downstream displacement of the PKA/PKc activity ratio to lower values,both in competing nerve terminals and at postsynaptic sites,plays a relevant role in controlling the elimination of supernumerary ***,calcium entry through L-and P/Q-subtypes of voltage-gated calcium channels(both channels are present,together with the n-type channel in developing nerve terminals)contributes to red

关键词： acetylcholine release adenosine receptors axonal competition brain-derived neurotrophic factor calcium channels motor end-plate muscarinic acetylcholine receptors postnatal synapse elimination serine kinases tropomyosin-related kinase receptorb

Determination of isospin asymmetry effects on α-decay

在线全文

学校读者我要写书评

暂无评论

chinese Physics c 2019年第12期43卷 100-106页

作者： b.A.Gheshlagh O.n.Ghodsi Department of Physics Faculty of Science University of Mazandaran

In this study,we compared the effect of the isospin asymmetry of proton and neutron density distributions in the neutron skin-type(nST)case and in the Hartree-Fock formalism(HF)on the half-life of alpha emitters with the atomic number in the range of 82≤Z≤*** nST case and HF formalism based on the Skyrme-SLy4 effective interaction reveal different isospin asymmetries for selected alpha ***,the obtained results reveal an increase in theα-decay widths of about 30%for the nST case in comparison with the equivalent values obtained by HF *** standard deviations for calculated half-lives within the nST case and HF formalism are about 0.438 and 0.391,respectively.

关键词： α-decay half-life preformation factor isospin asymmetry neutron skin thickness

buckling analysis of ring stiffened thin cylindrical shell under external pressure

在线全文

学校读者我要写书评

暂无评论

Journal of ocean Engineering and Science 2021年第4期6卷 360-366页

作者： n.Rathinam b.Prabu n.Anbazhaghan Department of Mechanical Engineering Pondicherry Engineering CollegePuducherry605014India Department of Mechanical Engineering VRS College of Engineering and TechnologyVillupuramIndia

Submarine pressure hulls,fire-tube boilers,vacuum tanks,oil well casings,submersibles,underground pipelines,tunnels,rocket motor casing,etc.,are some of the examples of thin cylindrical shell structures which collapse due to buckling under uniform *** enhance the buckling strength of bare cylin-drical shells,one of the best solutions is to stiffen them with ring *** this work in order to predict the shell instability failure mode(SIFM)and general instability failure mode(GIFM)FE models are generated and analysed using buckling analysis of general-purpose FE software *** numeri-cal results obtained using FE analysis are compared with published analytical and experimental *** in the present study effort s are taken to develop FE models to predict global and shell instability failure modes of externally ring stiffened cylindrical shells by using linear FE *** is proposed to use full/half bare cylindrical shell FE models(L/R ratio upto 200)to determine SIFM and FE models with shell281-beam189(for stiffeners)can be used to determine *** developed FE models are vali-dated by comparing numerical results with experimental results published by Seleim and Roorda[25].by using both proposed FE models it is possible to predict the failure modes namely SIFM and GIFM,comparing their values of critical buckling *** lower pressure value can indicate the possible failure mode.

关键词： Thin shell structures critical buckling pressure(cbP) Lateral pressure GIFM SIFM

Modeling and simulation of centroid and inversion charge density in cylindrical surrounding gate MOSFETs including quantum effects

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 Semiconductors 2013年第11期34卷 25-30页

作者： P.Vimala n.b.balamurugan Department of Electronics and communication Engineering Thiagarajar College of Engineering

An analytical model for surrounding gate metal-oxide-semiconductor field effect transistors （MOS- FETs） considering quantum effects is presented. To achieve this goal, we have used a variational approach for solving the Poisson and Schrodinger equations. This model is developed to provide an analytical expression for the inversion charge distribution function for all regions of the device operation. This expression is used to calculate the other important parameters like the inversion charge centroid, threshold voltage and inversion charge density. The calculated expressions for the above parameters are simple and accurate. The validity of this model was checked for the devices with different device dimensions and bias voltages. The calculated results are compared with the simulation results and they show good agreement.

关键词： surrounding gate MOSFETs energy quantization centroid inversion charge density