检索结果-南通市图书馆

Energy-and trust-aware secure routing algorithm for big data classification using MapReduce framework in IoT networks

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 Modeling, Simulation, and Scientific Computing 2021年第2期12卷 80-103页

作者： S.Md.Mujeeb R.Praveen Sam k.Madhavi Department of CSE Jawaharlal Nehru Technological University Anantapur(JNTUA)Ananthapuramu-515002 Andhra PradeshIndia Department of Computer Science and Engineering G.Pulla Reddy Engineering College(Autonomous)Nandyal Road Kurnool 518007Andhra PradeshIndia

Due to the open nature of wireless data transmission,routing and data security pose an important research challenge in the Internet of Things(IoT)-enabled ***,the characteristic features,like constrained resources,heterogeneity,uncontrolled environment,and scalability requirement,make the security issues even more ***,an effective and secure routing protocol named modified Energy Harvesting Trust-aware Routing Algorithm(mod-EHTARA)is proposed to increase the energy efficiency and the lifespan of the *** proposed mod-EHTARA is designed by adopting the Link Lifetime(LLT)model with the traditional *** optimal secure routing path is effectively selected by the proposed mod-EHTARA using the cost metric,which considers the factors like delay,LLT,energy,and *** big data classification process is carried out at the Base Station(BS)using the MapReduce ***,the big data classification is progressed using a stacked autoencoder,which is trained by the Adaptive E-Bat *** Adaptive E-Bat algorithm is developed by integrating the adaptive concept with the Bat Algorithm(BA)and Exponential Weighted Moving Average(EWMA).The proposed mod-EHTARA showed better performance by obtaining a maximal energy of 0.9855.

关键词： Stacked autoencoder big data classification Internet of Things secure routing energy harvesting

Interactive effects of reproductive assets and ambient predation risk on the threat-sensitive decisions of Trinidadian guppies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2016年第3期62卷 221-226页

作者： Jemma kATWAROO-ANDERSEN Chris k. ELVIDGE Indar RAMNARINE Grant E. BROWN Department of Biology Concordia University 7141 Sherbrooke St. West Montreal QC H4B 1R6 Canada Department of Life Sciences University of the West Indies St. Augustine Trinidad and Tobago

Threat-sensitive behavioral trade-offs allow prey animals to balance the conflicting demands of successful predator detection and avoidance and a suite of fitness-related activities such as forag- ing, mating, and territorial defense. Here, we test the hypothesis that background predation level and reproductive status interact to determine the form and intensity of threat-sensitive behavioral decisions of wild-caught female Trinidadian guppies Poecilia reticulata. Gravid and nongravid gup- pies collected from high- and low-predation pressure populations were exposed to serial dilutions of conspecific chemical alarm cues. Our results demonstrate that there was ＇no effect of reproduct- ive status on the response of females originating from a low-predation population, with both gravid and nongravid guppies exhibiting strong anti-predator responses to the lowest concentration of alarm cues tested. Increasing cue concentrations did not result in increases in response intensity. Conversely, we found a significant effect of reproductive status among guppies from a high- predation population. Nongravid females from the high-predation population exhibited a strong graded （proportional） response to increasing concentrations of alarm cue. Gravid females from the same high-predation population, however, shifted to a nongraded response. Together, these re- sults demonstrate that accrued reproductive assets influence the threat-sensitive behavioral deci- sions of prey, but only under conditions of high-ambient predation risk.

关键词： asset protection antipredator behavior fitness trade-offs ecological uncertainty chemical alarm cues.

Cilia-assisted hydromagnetic pumping of biorheological couple stress fluids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Propulsion and Power Research 2019年第3期8卷 221-233页

作者： k.Ramesh D.Tripathi O.Anwar Bég Department of Mathematics Symbiosis Institute of TechnologySymbiosis International UniversityPune412115India Department of Mechanical Engineering Manipal University JaipurRajasthan303007India Fluid Mechanics/Propulsion Aeronautical/Mechanical Engineering DepartmentSalford UniversityManchesterUK

A theoretical study is conducted for magnetohydrodynamic pumping of electroconductive couple stress physiological liquids(***)through a two-dimensional ciliated channel.A geometric model is employed for the cilia which are distributed at equal intervals and produce a whip-like motion under fluid interaction which obeys an elliptic trajectory.A metachronal wave is mobilized by the synchronous beating of cilia and the direction of wave propagation is parallel to the direction of fluid flow.A transverse static magnetic field is imposed transverse to the channel *** Stokes’couple stress(polar)rheological model is utilized to characterize the *** normalized two-dimensional conservation equations for mass,longitudinal and transverse momentum are reduced with lubrication approximations(long wavelength and low Reynolds number assumptions)and feature a fourth order linear derivative in axial velocity representing couple stress contribution.A coordinate transformation is employed to map the unsteady problem from the wave laboratory frame to a steady problem in the wave *** slip conditions are imposed at the channel *** emerging linearized boundary value problem is solved analytically and expressions presented for axial(longitudinal)velocity,volumetric flow rate,shear stress function and pressure *** flow is effectively controlled by three geometric parameters,viz cilia eccentricity parameter,wave number and cilia length and two physical parameters,namely magnetohydrodynamic(MHD)body force parameter and couple stress non-Newtonian *** solutions are numerically evaluated with MATLAB *** velocity is observed to be enhanced in the core region with greater wave number whereas it is suppressed markedly with increasing cilia length,couple stress and magnetic parameters,with significant flattening of profiles with the latter two *** pressure gradient is decreased with eccentricity parameter whereas it is ele

关键词： Magneto hydrodynamics Metachronal waves Cilia Synchronous beating Polar couple stress fluid Physiological transport Magnetic blood pumps

Analysis of a fractional-order SIS epidemic model with saturated treatment

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 Modeling, Simulation, and Scientific Computing 2021年第1期12卷 185-212页

作者： Soovoojeet Jana Manotosh Mandal Swapan kumar Nandi T.k.kar Department of Mathematics Ramsaday College Amta-711401HowrahWest BengalIndia Department of Mathematics Tamralipta Mahavidyalaya Tamluk-721636West BengalIndia Department of Mathematics Nayabasat P.M.Sikshaniketan Paschim Medinipur-721253West BengalIndia Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah-711103West BengalIndia

In this paper,we propose and analyze a fractional-order SIS epidemic model with the saturated treatment and disease *** existence and uniqueness,nonnegativity and finiteness of solutions for our suggested model have been *** equilibria of the model are found and their local and global stability analyses are also ***,the conditions for fractional backward and fractional Hopf bifurcation are also analyzed in both the commensurate and incommensurate fractional-order *** study how the control parameter and the order of the fractional derivative play role in local as well as global stability of equilibrium points and Hopf *** have demonstrated the analytical results of our proposed model system through several numerical simulations.

关键词： Caputo fractional differentiation SIS epidemic model global asymptotic stability treatment control fractional Hopf bifurcation fractional backward bifurcation

Variability in cone and seed characteristics and seed testing in various provenances of Himalayan spruce (Picea smithiana)

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 Forestry Research 2011年第4期22卷 603-610页

作者： B. S. Rawat A. k. Uniyal Department of Forestry Doon (PG) College of Agriculture Science & Technology Selaqui Dehradun Uttrakhand 248197 India

Abstract： We investigated the effect of provenance variation on cone and seed morphology and germination behaviunr under different pretreatments in Picea smithiana. Three categories of cones were recognized： large （13.18 cm×3.30 cm-15.42 cm × 4.35 cm）, medium （10.85 cm × 3.93 cm-12.18 cm× 3.98 cm） and small （7.69 cm× 3.06-10.98 cm× 3.39 cm）. Significant variation was observed for various cone and seed characteristics. Seeds moisture content varied from 44.48% to 56.91%, seed size from 0.64 cmx 0.31 cm （largest seed） to 0.49 cm× 0.10 cm （smallest seed）, and the seed weight from 2.45 g per 100 seeds to 1.36 g per 100 seeds on fresh weight basis of P. smithiana. The highest seed germination （72.0±7.53%） at 10℃ was observed under chilling treatment in Tapovan provenance, while the minimum （15.0±5.71%） seed germination was recorded at 25℃ under control set in Tapovan provenance. Further among all the sources Pandukeshwar consistently had the highest average （38%） percent germination across all treatments. Compared to other temperature regimes and pretreatments, seeds subjected to 10℃ and chilling treatment had the highest germination and took the least time for germination irrespective of provenance effects. Altitude （provenance） had little or no relationship with germination following laboratory treatments. Seeds from Tapovan provenance subjected at 10℃ following chilling treatment may be suggested for further multiplication of this species.

关键词： Dormancy Garhwal Himalaya germination value seedsources seed weight

Recent biotechnological trends in lactic acid bacterial fermentation for food processing industries

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

Systems Microbiology and Biomanufacturing 2022年第1期2卷 14-40页

作者： Tirath Raj k.Chandrasekhar A.Naresh kumar Sang-Hyoun kim School of Civil and Environmental Engineering Yonsei UniversitySeoul 03722Republic of Korea

Lactic acid bacteria(LAB)are non-mobile,gram-positive,non-spore-forming,micro-aerophilic microorganisms widely explored as starter cultures food industry to enhance the gustatory,nutritional value,imparts appetizing favour,texture to milk,vegetative,meat foods and prolongs their shelf *** vast review emphasis various LABs widely explored in the food ***,we have summarized the classifcation of LAB strains,their metabolic pathways for biosynthesis of lactic acid,ethanol,acetic acid and demonstrated their application in various food industries for making fermented milk(yoghurt),cheese,beverages,bread,and animal *** wide spectrum of LAB-based probiotics,bacteriocins,exopolysaccharides,bio preservative and their relevant benefts towards human health has also been ***,LAB bacteriocins and probiotics in food application may limit the growth of pathogenic,while boosting health *** exopolysaccharides have interesting characteristics for the fermented food industry as new functional *** on,we have discussed the various advancement in metabolic engineering,synthetic biology tools,which have gained considerable interest to elucidate the biosynthetic pathway for tailoring cellular metabolism for high activity.

关键词： Lactic acid bacteria Fermentation Exopolysaccharides Carbohydrates Bacteriocins Probiotics

Management of recurrent hepatocellular carcinoma after resection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2020年第6期9卷 780-783页

作者： Hwee Leong Tan Brian k.P.Goh Department of Hepatopancreatobiliary and Transplant Surgery Singapore General HospitalSingaporeSingapore Duke-NUS Medical School Singapore SingaporeSingapore

Introduction Hepatocellular carcinoma(HCC)is currently the fifth most common cancer globally,accounting for the third highest cancer-related deaths(1).Liver resection is the treatment modality of choice for resectable HCCs with adequate liver function in the absence of portal hypertension(1),but actuarial recurrence rates remain as high as 70%at 5 years post-resection(2).The recurrence of HCC post-resection portends poorer prognosis,with a 24%reduction in 5-year survival(2).While there have been a multitude of guidelines for the management of primary HCC across the world(3),the international expert consensus recently published by Wen et *** the first systematic,evidence-based consensus guidelines for the management of recurrent HCC(RHCC)following liver resection(4).

关键词： resection Liver globally

Cleavage of the Carboxyl-Terminus of LEACS2, a Tomato 1-Aminocyclopropane-l-Carboxylic Acid Synthase Isomer, by a 64-kDa Tomato Metalloprotease Produces a Truncated but Active Enzyme

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 Integrative Plant Biology 2005年第11期47卷 1352-1363页

作者： Jian-Feng LI Robert QI Liang-Hu QU Autar k Mattoo Ning LI Department of Biology The Hong Kong University of Science and Technology Hong Kong SAR China key Laboratory of Gene Engineering of the Ministry of Education Zhongshan University Guangzhou 510275 China Department of Biochemistry The Hong kong University of Science and Technology Hong Kong SAR China Sustainable Agricultural Systems Laboratory United States Department of Agriculture-Agriculture Research Service Beltsville Maryland 20705-2350 USA

1-Aminocyclopropane-1-carboxylic acid （ACC） synthase （ACS） is the principal enzyme in phytohormone ethylene biosynthesis. Previous studies have shown that the hypervariable C-terminus of ACS is proteolytically processed in vivo. However, the protease responsible for this has not yet been identified. In the present study, we investigated the processing of the 55-kDa full-length tomato ACS （LeACS2） into 52-, 50- and 49-kDa truncated isoforms in ripening tomato （Lycopersicon esculentum Mill. cv. Cooperation 903） fruit using the sodium dodecyl sulfate-boiling method. Meanwhile, an LeACS2-processing protease was purified via multi-step column chromatography from tomato fruit. Subsequent biochemical analysis of the 64-kDa purified protease revealed that it is a metalloprotease active at multiple cleavage sites within the hypervariable C-terminus of LeACS2. N-terminal sequencing and matrix-assisted laser desorption/ionization time-of-flight analysis indicated that the LeACS2-processing metalloprotease cleaves at the C-terminal sites Lys^438, Glu^447, Lys^448, Asn^456, Ser^460, Ser^462, Lys^463, and Leu^474, but does not cleave the N- terminus of LeACS2. Four C-terminus-deleted （26-50 amino acids） LeACS2 fusion proteins were overproduced and subjected to proteolysis by this metalloprotease to identify the multiple cleavage sites located on the N-terminal side of the phosphorylation site Ser^460. The results indisputably confirmed the presence of cleavage sites within the region between the α-helix domain （H14） and Ser^460 for this metalloprotease. Furthermore, the resulting C-terminally truncated LeACS2 isoforms were active enzymatically. Because this protease could produce LeACS2 isoforms in vitro similar to those detected in vivo, it is proposed that this metalloprotease may be involved in the proteolysis of LeACS2 in vivo.

关键词： 1-aminocyclopropane-1-carboxylic acid synthase cleavage sites metalloprotease proteolytic processing.

Eco-friendly synthesis of benzimidazole derivatives using solid acid scolecite catalyst

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第9期21卷 1053-1056页

作者： Lakshman S.Gadekar Balasaheb R.Arbad Machhindra k.Lande Department of Chemistry Dr.Babasaheb Ambedkar Marathwada University

A series of benzimidazole derivatives were synthesized expeditiously in good yields by condensation of 1,2-diaminobenzene and aromatic aldehydes in the presence of modified scolecite *** world wide availability,easy handling and reusability of catalyst,higher yields and shorter reaction times are the advantages of the present method.

关键词： Benzimidazole Ethanol Natural zeolite-scolecite