检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2025年第2期46卷 357-372页

作者： C.G.PAVITHRA B.J.GIREESHA S.SUSHMA K.J.GOWTHAM department of pg Studies and research in Mathematics Kuvempu University

A distinguished category of operational fluids, known as hybrid nanofluids,occupies a prominent role among various fluid types owing to its superior heat transfer properties. By employing a dovetail fin profile, this work investigates the thermal reaction of a dynamic fin system to a hybrid nanofluid with shape-based properties, flowing uniformly at a velocity U. The analysis focuses on four distinct types of nanoparticles,i.e., Al2O3, Ag, carbon nanotube (CNT), and graphene. Specifically, two of these particles exhibit a spherical shape, one possesses a cylindrical form, and the final type adopts a platelet morphology. The investigation delves into the pairing of these *** examination employs a combined approach to assess the constructional and thermal exchange characteristics of the hybrid nanofluid. The fin design, under the specified circumstances, gives rise to the derivation of a differential equation. The given equation is then transformed into a dimensionless form. Notably, the Hermite wavelet method is introduced for the first time to address the challenge posed by a moving fin submerged in a hybrid nanofluid with shape-dependent features. To validate the credibility of this research, the results obtained in this study are systematically compared with the numerical simulations. The examination discloses that the highest heat flux is achieved when combining nanoparticles with spherical and platelet shapes.

关键词： Hermite wavelet method radiation convection dovetail fin nanoparticle configuration O351.2

Analysing Effectiveness of Sentiments in Social Media Data Using Machine Learning Techniques

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 Computer and Communications 2025年第1期13卷 136-151页

作者： Thambusamy Velmurugan Mohandas Archana Ajith Singh Nongmaithem pg & research department of Computer Science D.G.Vaishnav College Chennai India pg department of IT & BCA D.G.Vaishnav College Chennai India department of Computer Science Souht East Manipur College Manipur India

Every second, a large volume of useful data is created in social media about the various kind of online purchases and in another forms of reviews. Particularly, purchased products review data is enormously growing in different database repositories every day. Most of the review data are useful to new customers for theier further purchases as well as existing companies to view customers feedback about various products. Data Mining and Machine Leaning techniques are familiar to analyse such kind of data to visualise and know the potential use of the purchased items through online. The customers are making quality of products through their sentiments about the purchased items from different online companies. In this research work, it is analysed sentiments of Headphone review data, which is collected from online repositories. For the analysis of Headphone review data, some of the Machine Learning techniques like Support Vector Machines, Naive Bayes, Decision Trees and Random Forest Algorithms and a Hybrid method are applied to find the quality via the customers’ sentiments. The accuracy and performance of the taken algorithms are also analysed based on the three types of sentiments such as positive, negative and neutral.

关键词： Support Vector Machine Random Forest Algorithm Naive Bayes Algorithm Machine Learning Techniques Decision Tree Algorithm

Ghost species form an important component of the epiphytic lichens in temperate forests

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

Forest Ecosystems 2025年第01期 20-28页

作者： Jan Vondrák Ji?í Ko?nar Stanislav Svoboda Zdeněk Palice Jaroslav ?oun Ji?í Kubásek Pavel Ríha Ji?í Malí?ek Jan Rydlo Jeňyk Hofmeister Institute of botany of the Czech Academy of Sciences department of botany Faculty of ScienceUniversity of South Bohemia Museum of Dr.Bohuslav Horák in Rokycany Branch of Museum of West Bohemia department of Experimental Plant Biology Faculty of ScienceUniversity of South Bohemia ReDpeupbalritcment of Forest Ecology Faculty of Forestry and Wood SciencesCzech University of Life Sciences in Prague Global Change research Institute of the Czech Academy of Sciences

Sequencing of environmental samples has great potential for biodiversity research, but its application is limited by the lack of reliable DNA barcode databases for species identifications. Such a database has been created for epiphytic lichens of Europe, allowing us to compare the results of environmental sequencing with standard taxonomic surveys. The species undetected by taxonomic surveys(what we term the ghost component) amount to about half of the species actually present in hectare plots of Central European forests. Some of these, which currently occur only as diaspores or weakly developed thalli, are likely to be favoured in the course of global change. The ghost component usually represents a larger fraction in managed forests than in old-growth unmanaged forests. The total species composition of different plots is much more similar than suggested by taxonomic surveys alone. On a regional scale, this supports the well-known statement that“everything is everywhere,but, the environment selects”.

关键词：

Biofilmed-pgPR:Next-Generation Bioinoculant for Plant Growth Promotion in Rice under Changing Climate

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rice science 2025年第1期32卷 94-106,I0059,I0060页

作者： Jeberlin Prabina BRIGHT Hemant SMAHESHWARI Sugitha THANGAPPAN Kahkashan PERVEEN Najat ABUKHARI Debasis MITRA Riyaz SAYYED Andrea MASTINU department of Soil Science and Agricultural Chemistry Agricultural College and Research InstituteTamil Nadu Agricultural UniversityKillikulam 628252India Indian Council of Agricultural research(ICAR)-Indian Institute of Soybean research Indore 452001India Karunya Institute of Technology and Sciences School of Agricultural SciencesKarunya NagarCoimbatore 641114India department of botany&Microbiology College of ScienceKing Saud UniversityRiyadh-11495Saudi Arabia department of Microbiology Graphic Era(Deemed to be University)Clement TownDehradun 248002India department of Biological Sciences and Chemistry College of Arts and ScienceUniversity of NizwaNizwa 616Sultanate of Oman department of Molecular and Translational Medicine Division of PharmacologyUniversity of BresciaBrescia 25123Italy

The exopolysaccharide matrix of diazotrophic cyanobacteria was used to integrate phosphorus(P)and potassium(K)solubilizing bacteria,enhancing the survival of plant growth-promoting rhizobacteria,and ultimately the survival of bacteria in the rhizosphere for better plant growth.A new biofilm-based formulation comprising the diazotrophic cyanobacteria Anabaena AMP2,P-solubilizing Bacillus megaterium *** PB1,and K-solubilizing Rhizobium pusense KRBKKM1 was tested for efficacy in *** growth medium with half-strength BG-11 medium supplemented with 3%glucose showed best for biofilm formation under in vitro *** of the methanolic extract of the cyanobacterial-bacterial biofilm(CBB)showed the activity of antioxidants,such as 2-methoxy phenol and pentadecane,which are proven to improve plant-microbe interactions and plant growth,*** of rice seeds with CBB extract at 100 mL/kg or 200 mL/kg showed significant enhancement in germination rate and seedling ***,a pot culture experiment with the CBB formulations was carried out,and different growth and yield parameters were *** component analysis showed that plant growth,yield,soil dehydrogenase activity,and soil chlorophyll content were positively correlated with rice plants amended with vermiculite-based CBB at 2 kg/hm^(2) followed by a spray with aqueous CBB formulation at 5 mL/L at 15 and 30 d after rice transplanting grown with a 25%reduced level of nitrogen/phosphorus/potassium chemical fertilizers than the recommended ***,Pearson correlation analysis showed that yield was positively correlated with soil dehydrogenase(r=0.92**)and soil chlorophyll content(r=0.96**).We concluded that CBB could be used as a novel biofilm-based bio-inoculant to increase rice productivity and crop fitness as a component in integrated nutrient management and sustainable organic farming strategies with reduced chemical fertilizers.

关键词： cyanobacterial bacterial biofilm formulation rice volatile compound plant growth promotion reduced fertilizer level

Estimation of above-ground biomass and carbon stock of an invasive woody shrub in the subtropical deciduous forests of Doon Valley,western Himalaya,India

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry research 2015年第2期26卷 291-305页

作者： Gautam Mandal S.P.Joshi Ecology research Laboratory Department of BotanyDAV (PG) College Faculty of Science The Lawrence School

This study describes the different parameters used to derive the allometric equation for calculating the biomass of an invasive woody shrub Lantana camara *** the subtropical conditions of western *** identifies the most accurate and convenient method for biomass calculation by comparing destructive with nondestructive *** parameters were measured on a wide range of Lantana from different community levels for the non-destructive calculation of total aboveground *** explanatory variables were identified and measured such as basal diameter either as a single independent variable or in combination with plant *** other suitable combinations of available independent variables include crown length,crown width,crown area,crown volume and coverage of the *** the wide range of allometric equations used with different variables,the equation with D2 H as a variable was found to be the most suitable estimator of biomass calculation for ***,being the most disturbed area due to its high tourist activity round the year,showed maximum coverage（58.57 % ha-1）,highest biomass（13,559.60 kg ha-1） and carbon density（6,373.01 kg ha-1）of *** degree of Lantana’s invasiveness in subtropical conditions was also calculated on the basis of importance value index（IVI）.The maximum IVI（22.77）and mean coverage（26.8 % ha-1） was obtained from the areas near Jolly Grant airport,indicating that physically disturbed areas are more suitable for the growth of Lantana,which may significantly increase shrub *** importance of incorporating allometric equations in calculation of shrub biomass,and its role in atmospheric carbon assimilation has thus been highlighted through the findings of this study.

关键词： Above ground carbon pools Allometric regression equations Carbon density Importance value index(IVI) Shrub biomass

Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen Chang Hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang Zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines(Chinese Academy of Sciences) Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical OncogenomicsPeking University Shenzhen Graduate SchoolShenzhen 518055China Shenzhen Bay Laboratory Shenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Microbial Metabolism School of Life Sciences&BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical UniversityGuiyang 550014China Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest ChinaKunming Institute of BotanyChinese Academy of SciencesKunming 650201China Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical SciencesBeijing 100730China

In the intricate process of natural product biosynthesis,a metabolon can enhance metabolic flux by associating sequential enzymes.A fungal metabolon,comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G,is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide *** notoamide E as a substance,Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation,followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium ***,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol *** provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词： metabolon Diels-Alder reaction semipinacol rearrangement biosynthesis notoamides spiro polycyclic alkaloids

Chemical profiling of Elaeocarpus serratus *** GC-MS

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2013年第12期3卷 985-987页

作者： Geetha DH Rajeswari M Indhiramuthu Jayashree pg and research department of botany Vellalar College for Women(Autonomous)

Objective:To determine the possible bioactive components of the ethanolic extract of leaves of Elaeocarpus serratus(***).Methods:The present research was carried out by using GC-MS analysis,while mass spectra of the compounds found in the extract was matched with the National Institute of Standards and Technology and Wiley ***:Thirty components from leaves of the above said plant were *** active principles with their retention time,molecular formula,molecular weight and concentration(%)in the ethanol extracts of leaf of *** are ***:This is the first report of documentation of active constituents from leaves of *** research reveals the potential of *** leaves as a good source of bioactive compounds such as fatty acid esters,alcohols,hydrocarbons,aldehydes,alkenes,fatty acids and amides that justify the use of this plant for its various ailments by traditional practitioners.

关键词： GC-MS Elaeocarpus serratus Hexadecanoic acid methyl ester Anti-inflammatory

Effect of pH on Crystal Size and Photoluminescence Property of ZnO Nanoparticles Prepared by Chemical Precipitation Method

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 Metallurgica Sinica(English Letters) 2015年第3期28卷 394-404页

作者： M.Jay Chithra M.Sathya K.Pushpanathan pg & research department of Physics Government Arts College

The effects of pH value on crystal size and optical property of zinc oxide nanoparticles prepared by chemical precipitation method were *** samples have been characterized by means of X-ray diffraction,scanning electron microscopy,ultraviolet-visible spectrometer and photoluminescence *** X-ray diffraction profile,it is found that the particle size of sample increases from 13.8 to 33 nm when the pH value of the solution was increased from 6 to *** study also shows that the particle size increases with pH *** shape of the zinc oxide nanoparticle has been confirmed by the scanning electron microscopy *** recorded ultraviolet-visible spectrum shows excitonic absorption peaks around 381 *** energy gap of the prepared samples has been determined from the ultraviolet-visible absorption spectrum,effective mass model equation and Tauc＇s *** was found that the energy gap of the prepared samples decreases with increase in pH *** recorded blue shift confirmed the quantum confinement effect in the prepared zinc oxide *** spectrum infers that the increase in pH value shifts the ultraviolet-visible emission but not the violet and green emissions.

关键词： Zinc oxide nanoparticles pH value Crystal structure Microstructure Energy gap Photoluminescence

Effect of Fuel to Oxidant Molar Ratio on Structural and DC Electrical Conductivity of ZnO Nanoparticles Prepared by Simple Solution Combustion Method

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第10期29卷 898-902页

作者： C.S.Naveen M.L.Dinesha H.S.Jayanna department of pg Studies and research in Physics Kuvempu University

ZnO nanoparticles of different sizes were prepared by varying the molar ratio of glycine and zinc nitrate hexahydrate as fuel and oxidizer （0.1, 0.8, 1.11, 1.3, 1.5, 1.7, 2.0） by simple solution combustion method. UV-Visible spectrophotometry studies show that, the band gap of the prepared ZnO nanoparticles increases with increasing fuel to oxidant （F/O） molar ratio up to 1.7 revealing the formation of ZnO nanoparticles. The decrease in band gap for the sample of F/O molar ratio 2.0 is due to an increase in particle size. Powder X-ray diffraction patterns of the prepared samples show the formation of single phase ZnO nanoparticles and the particle size decreases with increasing F/O molar ratio up to 1.7. Surface morphology of the prepared samples was studied by scanning electron microscopy and it was observed that, the porosity increases with increasing F/O molar ratio. DC electrical conductivity at room temperature and in the temperature range of 303-563 K was studied for all the samples and the results revealed that, the sample of F/O molar ratio 1.7 has low electrical conductivity at room temperature and high EAR （high temperature activation energy） compared to other samples.

关键词： ZnO nanoparticles Structural characterization Electrical conductivity

Flower-shaped CuO Nanostructures: Synthesis,Characterization and Antimicrobial Activity

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第10期29卷 909-914页

作者： K.Mageshwari R.Sathyamoorthy pg & research department of Physics Kongunadu Arts and Science College

In the present work, flower-like CuO nanostructures were synthesized by reflux condensation method without using any surfactants or templates. Structural analysis by X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR） and Raman studies revealed the formation of highly crystalline single phase CuO, exhibiting monoclinic structure. Morphological analysis by field emission scanning electron microscopy （FESEM） showed flower-shaped CuO hierarchical architecture made up of interpenetrating self-assembled nanosheets. Optical analysis by UV-Vis diffused reflectance spectra （DRS） exhibited considerable blue-shift in the optical band gap due to quantum confinement effect. Photoluminescence （PL） spectrum showed both UV as well as visible emissions. The antibacterial activity of flower-shaped CuO nanostructures were tested against gram-positive （Bacillus subtilis, Bacillus thuringiensis） and gram-negative （Salmonella paratyphi, Salmonella paratyphi-a, Salmonella paratyphi-b, Escherichia coil and Pseudomonas aeruginosa） bacteria. Also, the antifungal activity of CuO was investigated against Aspergillus niger, Rhizopus oryzae, Aspergi/lus flavus, Cladosporium carrionii, Mucor, Penicilliurn notatum and Alternaria alternata. Results demonstrate that the flower-shaped CuO nanostructures act as an effective antimicrobial agent against pathogenic bacteria and fungi.

关键词： CuO nanosheets Hierarchical X-ray diffraction Photoluminescence Antibacterial Antifungal