检索结果-南通市图书馆

prediction of Geopolymer Concrete Compressive Strength Using Convolutional Neural 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

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1455-1486页

作者： Kolli Ramujee pooja Sadula Golla madhu Sandeep Kautish Abdulaziz S.Almazyad Guojiang Xiong Ali Wagdy Mohamed Department of Civil Engineering VNR Vignana Jyothi Institute of Engineering and TechnologyHyderabadTelangana500090India Department of Information Technology VNR Vignana Jyothi Institute of Engineering and TechnologyHyderabadTelangana500090India Department of Computer Science LBEF Campus(Asia Pacific University of Technology&InnovationMalaysia)Kathmandu44600Nepal Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityP.O.Box 51178Riyadh11543Saudi Arabia Guizhou Key Laboratory of Intelligent Technology in power System College of Electrical EngineeringGuizhou UniversityGuiyang550025China Operations Research Department Faculty of Graduate Studies for Statistical ResearchCairo UniversityGiza12613Egypt Applied Science Research Center Applied Science Private UniversityAmmanJordan

Geopolymer concrete emerges as a promising avenue for sustainable development and offers an effective solution to environmental problems.Its attributes as a non-toxic,low-carbon,and economical substitute for conventional cement concrete,coupled with its elevated compressive strength and reduced shrinkage properties,position it as a pivotal material for diverse applications spanning from architectural structures to transportation infrastructure.In this context,this study sets out the task of using machine learning(ML)algorithms to increase the accuracy and interpretability of predicting the compressive strength of geopolymer concrete in the civil engineering field.To achieve this goal,a new approach using convolutional neural networks(CNNs)has been adopted.This study focuses on creating a comprehensive dataset consisting of compositional and strength parameters of 162 geopolymer concrete mixes,all containing Class F fly ash.The selection of optimal input parameters is guided by two distinct criteria.The first criterion leverages insights garnered from previous research on the influence of individual features on compressive strength.The second criterion scrutinizes the impact of these features within the model’s predictive framework.Key to enhancing the CNN model’s performance is the meticulous determination of the optimal hyperparameters.Through a systematic trial-and-error process,the study ascertains the ideal number of epochs for data division and the optimal value of k for k-fold cross-validation—a technique vital to the model’s robustness.The model’s predictive prowess is rigorously assessed via a suite of performance metrics and comprehensive score analyses.Furthermore,the model’s adaptability is gauged by integrating a secondary dataset into its predictive framework,facilitating a comparative evaluation against conventional prediction methods.To unravel the intricacies of the CNN model’s learning trajectory,a loss plot is deployed to elucidate its learning rate.The study culminates in compelling findings th

关键词： Class F fly ash compressive strength geopolymer concrete prediction deep learning convolutional neural network

Investigation of hepatoprotective activity of Cyathea gigantea(Wall.ex.Hook.)leaves against paracetamol-induced hepatotoxicity in rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Tropical Biomedicine 2012年第5期2卷 352-356页

作者： p madhu kiran A Vijaya Raju B Ganga Rao A.U College of pharmaceutical Sciences Andhra University

Objective:To investigate the hepatoprotective activity of methanolic leaf extract of Cyathea gigantea(C.gigantea)against paracetamol induced liver damage in rats.Methods:The hepatoprotective activity for plant extract was investigated for paracetamol induced hepatoxicity in rats.Wislar albino rats of either sex were divided into five groups of 6 animals each and are given orally the following treatment for seven days.The normal control group was given 1%Na.CMC 1mL/kg bw,p.o.paracetamol at dose of 1g/kg bw,p.***.was given as toxic dose for inducing hepatoloxicity.Silymarin(50mg/kg.p.o.) was given as reference standard.Two doses of C. gigantea extract i.e.,100 mg/kg.***.o.and 200 mg/kg,p.***.were tested for hepatoprotective activity. The treatment was given for seven days and after 24 h of last treatment blood was collected from retro-orbital plexus and analysed for various serum parameters like serum glutamic-oxaloacetic transaminase(SGOT),serum glutamic pyruvic transaminase(SGpT),alkaline phosphatase(ALp),total bilirubin(TB)and total protein(Tp)in different groups.Results:The paracetamol intoxication lead to histological and biochemical deteriorations.The treatment with methanolic leaf extract of C.gigantea reduced the elevated levels of SCOT,SGpT,ALp,TB and also reversed the hepatic damage towards normal which further supports the hepatoprotective activity of leaf extract of C.gigantea.Conclusions:The methanolic extract of leaves of C.gigantea at doses of 100 mg/kg bw and 200 mg/kg bw have significant effect on liver of paracetamol induced hepatotoxicity model in rats.

关键词： Hepatoprotective Cyathea gigantea paracetamol Silymarin Hepatotoxicity

Hidden Markov Models Incorporating Fuzzy Measures and Integrals for protein Sequence Identification and Alignment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genomics, proteomics & Bioinformatics 2008年第2期6卷 98-110页

作者： Niranjan p. Bidargaddi madhu Chetty Joarder Kamruzzaman Gippsland School of Computing and Information Technology Monash University Churchill VIC 3842 Aus-tralia

profile hidden Markov models （HMMs） based on classical HMMs have been widely applied for protein sequence identification. The formulation of the forward and backward variables in profile HMMs is made under statistical independence assumption of the probability theory. We propose a fuzzy profile HMM to overcome the limitations of that assumption and to achieve an improved alignment for protein sequences belonging to a given family. The proposed model fuzzifies the forward and backward variables by incorporating Sugeno fuzzy measures and Choquet integrals, thus further extends the generalized HMM. Based on the fuzzified forward and backward variables, we propose a fuzzy Baum-Welch parameter estimation algorithm for profiles. The strong correlations and the sequence preference involved in the protein structures make this fuzzy architecture based model as a suitable candidate for building profiles of a given family, since the fuzzy set can handle uncertainties better than classical methods.

关键词： fuzzy profile HMM sequence alignment fuzzy measure fuzzy integral

Low velocity impact studies of E-glass/epoxy composite laminates at different thicknesses and temperatures

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第6期15卷 897-904页

作者： T.Sreekantha Reddy p.Rama Subba Reddy Vemuri madhu Defence Metallurgical Research Laboratory

Low velocity impact experiments were carried out on E-glass/epoxy composite laminates having varying thicknesses at sub zero and elevated temperatures using hemi spherical steel impactor of 16 mm diameter with impact energies in the rage of 50-150 J.The performance of the laminates was assessed in terms of energy absorption,maximum displacement,peak force and failure behaviour.Results indicated that the effect of temperature on energy absorption of the laminate is negligible although the laminates are embrittling at sub zero temperatures.However it has influence on failure behaviour and displacement.peak force has increased linearly with increase in laminate thickness from 5 to 10 mm.However it got reduced by 25% when temperature was increased from-20℃ to 100℃,Based on experimental results,laminate perforation energies were predicted using curve fitting equations.Statistical analysis was carried out using Taguchi method to identify the global effects of various parameters on laminate performance and confirmed that the laminate thickness has significant influence as compared to temperature,for the studied range.

关键词： Laminates Glass fibres Impact behaviour Delamination

Development of cost effective personnel armour through structural hybridization

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2020年第6期16卷 1089-1097页

作者： p.Rama Subba Reddy T.Sreekantha Reddy I.Srikanth Juhi Kushwaha V.madhu Defence Metallurgical Research Laboratory Hyderabad500058India Advanced Systems Laboratory Hyderabad500058India

The objective of the present study is to develop cost effective thermoplastic hybrid laminate using Dyneema®HB50 and Tensylon®HSBD 30A through structural hybridization method.Laminates having 20 mm thickness were fabricated and subjected to 7.6239 mm mild steel core projectile with an impact velocity of 730±10 ms1.parameters such as energy absorption,back face deformation and rate of back face deformation were measured as a function of hybridization ratio.It was observed that hybrid laminate with 50:50 ratio(w/w)of Tensylon®and Dyneema®with Tensylon®as front face showed 200%more energy absorption when compared to 100%Tensylon®laminate and showed equal energy absorption as that of expensive 100%Dyneema®laminate.Moreover,hybrid laminate with TD50:50 ratio showed 40%lower in terms of final back face deformation than Dyneema®laminate.Rate of back face deformation was also found to be slow for hybrid laminate as compared to Dyneema®laminate.Dynamic mechanical analysis showed that,Tensylon®laminate has got higher stiffness and lower damping factor than Dyneema®and hybrid laminates.The interface between Tensylon®and Dyneema®layers was found to be separating during the penetration process due to the poor interfacial bonding.Failure behaviour of laminates for different hybridization ratios were studied by sectioning the impacted laminates.It was observed that,the Tensylon®laminate has undergone shear cutting of fibers as major failure mode whereas the hybrid laminate showed shear cutting followed by tensile stretching,fiber pull out and delamination.These inputs are highly useful for body armour applications to design cost effective armour with enhanced performance.

关键词： Dyneema® Tensylon® Hybrid laminate Ballistic impact Energy absorption Back face signature

Impact of the source and serial passaging of goat mesenchymal stem cells on osteogenic differentiation potential:implications for bone tissue engineering

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2016年第4期7卷 482-494页

作者： Hoda Elkhenany Lisa Amelse Marc Caldwell Ramadan Abdelwahed madhu Dhar Department of Large Animal Clinical Sciences University of Tennessee Department of Surgery Faculty of Veterinary MedicineAlexandria University

Background： Adult mesenchymal stem cells （MSCs） can be conveniently sampled from bone marrow, peripheral blood, muscle, adipose and connective tissue, harvested from various species, including, rodents, dogs, cats, horses, sheep, goats and human beings. The MSCs isolated from adult tissues vary in their morphological and functional properties. These variations are further complicated when cells are expanded by passaging in culture. These differences and changes in MSCs must be considered prior to their application in the clinic or in a basic research study. Goats are commonly used as animal models for bone tissue engineering to test the potential of stem cells for bone regeneration. As a result, goat MSCs isolated from bone marrow or adipose tissue should be evaluated using in vitro assays, prior to their application in a tissue engineering project. Results： In this study, we compared the stem cell properties of MSCs isolated from goat bone marrow and adipose tissue. We used quantitative and qualitative assays with a focus on osteogenesis, including, colony forming unit, rate of cell proliferation, tri-lineage differentiation and expression profiling of key signal transduction proteins to compare MSCs from low and high passages. primary cultures generated from each source displayed the stem cell characteristics, with variations in their osteogenic potentials. Most importantly, low passaged bone marrow MSCs displayed a significantly higher and superior osteogenic potential, and hence, will be the preferred choice for bone tissue engineering in future in vivo experiments. In the bone marrow MSCs, this process is potentially mediated by the p38 MApK pathway. On the other hand, osteogenic differentiation in the adipose tissue MSCs may involve the p44/42 MApK pathway. Conclusions： Based on these data, we can conclude that bone marrow and fat-derived MSCs undergo osteogenesis via two distinct signaling pathways. Even though the bone marrow MSCs are the preferred source for bone tissue engineering, the adipose tissue MS

关键词： Caprine mesenchymal Osteogenesis stem cells

Bioactivity guided isolation of mosquito larvicide from piper longum

在线全文

学校读者我要写书评

暂无评论

Asian pacific Journal of Tropical Medicine 2011年第2期4卷 112-116页

作者： madhu.S Kumar Vijayan VA Shaukath AK Vector Biology Research Lab Department of Studies in ZoologyUniversity of MysoreManasagangotriMysore 570 006KarnatakaIndia Department of Studies in Zoology University of MysoreManasagangotriMysore 570 006KarnatakaIndia Department of Chemistry Yuvaraja's CollegeUniversity of MysoreMysore-05India

Objective:To isolate the larvicidal component from the fruits of piper longum（p.longum） against the filariasis vector,Culex quinquefasciatus（C.quinquefasciatus）.Methods:pulverized fruits of p.longum were subjected to soxhlet extraction using series of organic solvents of increasing polarity.All the solvent extracts were verified for their larvicidal efficacy against 4th instar larvae of C.quinquefasciatus employing standard WHO procedure.Bioassayguided fractionation through column chromatography lead to the isolation of a bioactive amide, pipyahyine from the petroleum ether extract.Results:petroleum ether extract was found to be the most active fraction among all the extracts tested with LC50 and LC90 being 1.03 and 2.04 ppm respectively.Whereas,pipyahyine,an isolated component of the same fraction was found to be even more effective than the parent extract in terms of LC50 being 0.58 and 1.88 ppm respectively. Conclusions:From the results,it is evident that p.longum can be considered as a powerful arsenal for the control of mosquito population.

关键词： piper longum Bioassay pipyahyine Culex quinquefasciatus Filariasis Larvicide

Antioxidant activity and identification of bioactive compounds from leaves of Anthocephalus cadamba by ultra-performance liquid chromatography/electrospray ionization quadrupole time of flight mass spectrometry

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Tropical Medicine 2012年第12期5卷 977-985页

作者： madhu Chandel Upendra Sharma Neeraj Kumar Bikram Singh Satwinderjeet Kaur Department of Botanical and Environmental Sciences Guru Nanak Dev UniversityAmritsar-143005 India Natural plant products Division CSIR-Institute of Himalyan Bioresource Technology(Council of scientific and Industrial research)PalampurH.P.-176061 India

Objective:To evaluate the antioxidant potential of different extract/fractions of Anthocephalus cadamba（A.cadamba）（Roxb.） Miq.（Rubiaceae） and study the tentative identification of their active constituents.Methods:The extract/fractions were screened for antioxidant activity using various in vitro assays viz.DppH assay,ABTS assay,superoxide anion radical scavenging assay, reducing power assay and plasmid DNA nicking assay.Total phenolic content of extract/fractions was determined by colorimetric method.An ultra-performance LC-electrospray-quadrupoletime of flight mass spectrometry method was used to analyse the active constituents of extract/ fractions of A.cadamba.Results:The ethyl acetate fraction was found to be most active fraction in all the assays as compared to other extract/fractions.The IC50 value of ethyl acetate fraction （ETAC fraction） was 21.24μg/mL,1.12μg/mL,9.68μg/mL and S7.81μg/mL in DppH assay, ABTS assay,reducing power assay and superoxide scavenging assay respectively.All the extract/ fractions also showed the potential to protect the plasmid DNA（pBR322） against the attack of hydroxyl radicals generated by Fenton’s reagent.The bioactive compounds were identified by UpLC-ESI-QTOF-MS,by comparing the mass andλmax with literature values.Conclusions:The potential of the extract/fractions to scavenge different free radicals in different systems indicated that they may be useful therapeutic agents for treating radical-related pathologic damage.

关键词： Anthocephalus cadamba Antioxidant activity UpLC-ESI-QTOF-MS

Camelina sativa,a short gestation oilseed crop with biofuel potential:Opportunities for Indian scenario

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Oil Crop Science 2021年第3期6卷 114-121页

作者： Ankur Agarwal Om prakash madhu Bala Defence Institute of Bio-Energy Research Defence R&D OrganizationGoraparaoP.O.ArjunpurHaldwaniUttarakhand263139India

Camelina is an oilseed crop which is being commercially produced globally as feedstock for biodiesel.Being a non-edible oil bearing low input crop owing to its low fertilizer and water requirement,fits well for biofuel production.In India,targets for biofuel blending has been set by New Biofuel policy-2018 and to meet these targets efforts are being made to harness the potential of available feedstock in the country.Among these feedstock,contribution of short gestation oilseed bearing crop has been very important.Camelina has been introduced in India during 2009–10 as experimental crop by DIBER,DRDO.Since then various efforts have made to standardize the production technology of this crop under various agro-climatic regions of the country,crop improvement,oil quality analysis and development of high energy by-products.Camelina has various advantages to offer for Indian biofuel sector.This paper reviews the potential of this crop for Indian Biofuel scenario.

关键词： Camelina False flax production Agro-technology Crop improvement Economics