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Current vortices and magnetic fields driven by moving polar twin boundaries in ferroelastic materials

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npj Computational Materials 2020年第1期6卷 454-459页

作者： Guangming Lu Suzhi Li Xiangdong Ding Jun Sun Ekhard k.H.Salje State key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Department of Earth Sciences University of CambridgeCambridge CB23EQUK

Ferroelastic twin boundaries often have properties that do not exist in bulk,such as superconductivity,polarity *** and optimizing domain walls can hence functionalize ferroelastic *** atomistic simulations,we report that moving domain walls have magnetic properties even when there is no magnetic element in the *** origin of a robust magnetic signal lies in polar vortex structures induced by moving domain walls,e.g.,near the tips of needle domains and near domain wall *** vortices generate displacement currents,which are the origin of magnetic moments perpendicular to the vortex *** phenomenon is universal for ionic crystals and holds for all ferroelastic domain boundaries containing dipolar moments.

关键词： magnetic moving walls

Synthesis of some novel divalent transition metal complexes as antimicrobials

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Chinese Chemical Letters 2011年第8期22卷 935-938页

作者： kaushal k.Oza Paresh N.Patel Hasmukh S.Patel Department of Chemistry.Sardar Patel University.Vallabh Vidyanagar 388120 GujaratIndia

A novel series of transition metal complexes have been synthesized from the reaction of 5-（（3-（methylthio）-5-（pyridin-4-yl）-4H- 1,2,4-triazol-4-ylamino）melhyl）quinolm-8-ol with transition metal *** structures of these compounds have been elucidated by elemental and spectral ***,compounds were screened for in vitro antimicrobial activity against the representative panel of two Gram-positive and two Gram-negative bacteria and two strains of *** various compounds show potent inhibitory action against test organisms.

关键词： 4-Amino-5-mercapto-1 2 4-tria/oles 8-Hydroxyquinoline Spectroscopic studies Antimicrobial activity

Oppositional Red Fox Optimization Based Task Scheduling Scheme for Cloud Environment

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Computer Systems Science & Engineering 2023年第4期45卷 483-495页

作者： B.Chellapraba D.Manohari k.Periyakaruppan M.S.kavitha Department of Information Technology Karpagam Institute of TechnologyCoimbatore641032TamilnaduIndia Department of Computer Science and Engineering St.Joseph’s Institute of TechnologyChennai600119India Department of Computer Science&Engineering SNS College of EngineeringCoimbatore641107India Department of Computer Science&Engineering SNS College of TechnologyCoimbatore641035India

Owing to massive technological developments in Internet of Things(IoT)and cloud environment,cloud computing(CC)offers a highly flexible heterogeneous resource pool over the network,and clients could exploit various resources on *** IoT-enabled models are restricted to resources and require crisp response,minimum latency,and maximum bandwidth,which are outside the *** was handled as a resource-rich solution to aforementioned *** high delay reduces the performance of the IoT enabled cloud platform,efficient utilization of task scheduling(TS)reduces the energy usage of the cloud infrastructure and increases the income of service provider via minimizing processing time of user ***,this article concentration on the design of an oppositional red fox optimization based task scheduling scheme(ORFOTSS)for IoT enabled cloud *** presented ORFO-TSS model resolves the problem of allocating resources from the IoT based cloud *** achieves the makespan by performing optimum TS procedures with various aspects of incoming *** designing of ORFO-TSS method includes the idea of oppositional based learning(OBL)as to traditional RFO approach in enhancing their efficiency.A wide-ranging experimental analysis was applied on the CloudSim *** experimental outcome highlighted the efficacy of the ORFO-TSS technique over existing approaches.

关键词： Metaheuristics task scheduling cloud computing internet of things makespan red fox optimizer

Combined analysis of land cover change and NDVI trends in the Northern Eurasian grain belt

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Frontiers of Earth Science 2012年第2期6卷 177-187页

作者： Christopher k. WRIGHT kirsten M. de BEURS Geoffrey M. HENEBRY South Dakota State University Geographic Information Science Center of Excellence (GIScCE) Brookings South Dakota 57007 USA The University of Oklahoma Department of Geography and Environmental Sustainability Norman OK 73019 USA

We present an approach to regional environ- mental monitoring in the Northern Eurasian grain belt combining time series analysis of MODIS normalized difference vegetation index （NDVI） data over the period 2001-2008 and land cover change （LCC） analysis of the 2001 and 2008 MODIS Global Land Cover product （MCD 12Q 1）. NDVI trends were overwhelmingly negative across the grain belt with statistically significant （p ≤0.05） positive trends covering only 1% of the land surface. LCC was dominated by transitions between three classes; cropland, grassland, and a mixed cropland/natural vegeta- tion mosaic. Combining our analyses of NDVI trends and LCC, we found a pattern of agricultural abandonment （cropland to grassland） in the southern range of the grain belt coinciding with statistically significant （p≤0.05） negative NDVI trends and likely driven by regional drought. In the northern range of the grain belt we found an opposite tendency toward agricultural intensification; in this case, represented by LCC from cropland mosaic to pure cropland, and also associated with statistically significant （p≤0.05） negative NDVI trends. Relatively small clusters of statistically significant （p ≤ 0.05） positive NDVI trends corresponding with both localized land abandonment and localized agricultural intensification show that land use decision making is not uniform across the region. Land surface change in the Northern Eurasian grain belt is part of a larger pattern of land cover land use change （LCLUC） in Eastern Europe, Russia, and former territories of the Soviet Union following realignment of socialist land tenure and agricultural markets. Here, we show that a combined analysis of LCC and NDVI trends provides a more complete picture of the complex- ities of LCLUC in the Northern Eurasian grain belt,involving both broader climatic forcing, and narrower anthropogenic impacts, than might be obtained from either analysis alone.

关键词： land cover change MODIS NDVI NorthernEurasian grain belt kazakhstan Russia time seriesanalysis Ukraine

Dynamic Active Noise Control of Broadband Noise in Fighter Aircraft Pilot Helmet

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Sound & Vibration 2022年第4期56卷 319-331页

作者： Y.k.Bharath S.Veena Malnad College of Engineering Hassan573202India National Aerospace Laboratories Bengaluru560017India

This paper presents the development of a dynamic Active Noise Control(ANC)algorithm aimed towards redu-cingthe broadbandnoiseinside the helmet earcups ofaﬁghter aircraftpilot *** dynamicANC involves a Variable Step-Size Grifﬁths(VSSG)FxLMS algorithm to attenuate noise entering directly through helmet,a LMS based adaptive noise canceller to attenuate noise entering through the pilot microphone,and energy detectors for failure protection and optimized battery power *** algorithms are implemented on Texas Instruments’TMS320C6748 processor and are tested in a helmet ANC experimental setup.

关键词： Active noise control Variable Step-Size Grifﬁths algorithm FxLMS

Physical modeling and visualization of soil liquefaction under high confining stress

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Earthquake Engineering and Engineering Vibration 2005年第1期4卷 47-57页

作者： Lenart González Tarek Abdoun Mourad Zeghal Vivian kallou Michael k.Sharp Dept.of Civil and Environmental Engineering Rensselaer Polytechnic Inst.(RPI)TroyNYUSA Mueser Rutledge Consulting Engineers 225 W 34th StreetNew YorkNYUSA US Army Engineer Research and Development Center VicksburgMSUSA

The mechanisms of seismically-induced liquefaction of granular soils underhigh confining stresses are still not fully *** of these mechanisms is generallybased on extrapolation of observed behavior at shallow *** centrifuge model tests wereconducted at RPI's experimental facility to investigate the effects of confining stresses on thedynamic response of a deep horizontal deposit of saturated *** was observed at highconfining stresses in each of the tests.A system identification procedure was used to estimate theassociated shear strain and stress time *** histories revealed a response marked byshear strength degradation and dilative *** recorded accelerations and pore pressures wereemployed to generate visual animations of the *** visualizations revealed a liquefactionfront traveling downward and leading to large shear strains and isolation of upper soil layers.

关键词： centrifuge modeling high confining stress liquefaction system identification visualization

Isolation of Fucoxanthin from the Rhizoid of Laminariajaponica Aresch

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Journal of Integrative Plant Biology 2005年第8期47卷 1009-1015页

作者： Wen-Jun WANG Guang-Ce WANG Ming ZHANG C. k. TSENG Institute of Oceanology the Chinese Academy of Sciences Qingdao 266071 China Graduate School the Chinese Academy of Sciences Beijing 100039 China Bureau of Environmental Protection of Feixi County in Anhui Province Hefei 231200 China

Fucoxanthin was extracted from the intact rhizoid of Laminariajaponica Aresch with dimethyl sulfoxide （DMSO）, and then recovered from the DMSO extract by partitioning into ethyl acetate and subsequent evaporation. Some isolation conditions such as solvent volume and extraction time were screened. The quantity and quality of the extracted fucoxanthin were determined by spectral analysis （absorption spectra and fluorescence emission spectra）. The results indicated that：（1） the average total content of fucoxanthin was 122.1μg in 1 g of fresh L. japonica rhizoid; （2） in comparison with the widely used organic solvent, acetone, DMSO was much more effective for the extraction of fucoxanthin; （3） both DMSO volume and extraction time influenced extraction efficiency such as the recovery rate and purity of fucoxanthin （1 g of fresh L. japonica rhizoid treated with 4 mL DMSO for 60 min, yielded 〉 88% of the total fucoxanthin with purity 0.63）; （4） when （NH4）2SO4 concentration was in the range of 0.5-1.0 mol/L, the pigments rapidly and entirely moved from DMSO into the ethyl acetate phase; （5） the ethyl acetate and DMSO were recycled using a rotary evaporator.

关键词： dimethyl sulfoxide extraction fucoxanthin Laminariajaponica rhizoid.

Discrete GWO Optimized Data Aggregation for Reducing Transmission Rate in IoT

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Computer Systems Science & Engineering 2023年第3期44卷 1869-1880页

作者： S.Siamala Devi k.Venkatachalam Yunyoung Nam Mohamed Abouhawwash Department of Computer Science and Engineering Sri Krishna College of TechnologyCoimbatore641042India Department of Applied Cybernetics Faculty of ScienceUniversity of Hradec KrálovéHradec Králové50003Czech Republic Department of Computer Science and Engineering Soonchunhyang UniversityAsan31538Korea Department of Mathematics Faculty of ScienceMansoura UniversityMansoura35516Egypt Department of Computational Mathematics Scienceand Engineering(CMSE)Michigan State UniversityEast LansingMI48824USA

The conventional hospital environment is transformed into digital transformation that focuses on patient centric remote approach through advanced *** diagnosis of many diseases will improve the patient *** cost of health care systems is reduced due to the use of advanced technologies such as Internet of Things(IoT),Wireless Sensor Networks(WSN),Embedded systems,Deep learning approaches and Optimization and aggregation *** data generated through these technologies will demand the bandwidth,data rate,latency of the *** this proposed work,efficient discrete grey wolf optimization(DGWO)based data aggregation scheme using Elliptic curve Elgamal with Message Authentication code(ECEMAC)has been used to aggregate the parameters generated from the wearable sensor devices of the *** nodes that are far away from edge node will forward the data to its neighbor cluster head using *** scheme will reduce the number of transmissions over the *** aggregated data are preprocessed at edge node to remove the noise for better *** node will reduce the overhead of cloud *** aggregated data are forward to cloud server for central storage and *** proposed smart diagnosis will reduce the transmission cost through aggrega-tion scheme which will reduce the energy of the *** cost for proposed system for 300 nodes is 0.34μ*** energy cost of existing approaches such as secure privacy preserving data aggregation scheme(SPPDA),concealed data aggregation scheme for multiple application(CDAMA)and secure aggregation scheme(ASAS)are 1.3μJ,0.81μJ and 0.51μJ *** optimization approaches and encryption method will ensure the data privacy.

关键词： Discrete grey wolf optimization data aggregation cloud computing IoT WSN smart healthcare elliptic curve elgamal energy optimization

Friction Sensitivity of Nitramines. Part Ⅳ:Links to Surface Electrostatic Potentials

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含能材料 2011年第6期19卷 613-615页

作者： Zdeněk Friedl Marcela Jungová Svatopluk Zeman Adéla Husarová Faculty of Chemistry Brno University of TechnologyCZ-612 00 BrnoThe Czech Republic Institute of Energetic Materials Faculty of Chemical TechnologyUniversity of PardubiceCZ-532 10 PardubiceThe Czech Republic

The friction sensitivity(FS) of five aliphatic linear and eight cyclic nitramines has been determined and correlated with DFT B3LYP/6-31-G(d,p) // 6-311+G(d,p) positive(VS,max) and negative(VS,min) extremes of molecular surface electrostatic potentials VS(r).While there is an ambiguous relationship between the VS,max values and FS values,the decrease of FS is connected(more or less) with increase in VS,min values.

关键词： physical chemistry electrostatic potential friction nitramines sensitivity