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Effect of equal channel angular pressing on AZ31 wrought magnesium alloys

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Journal of Magnesium and Alloys 2013年第4期1卷 336-340页

作者： avvari muralidhar S.Narendranath H.Shivananda Nayaka Mechanical Engineering Department National Institute of Technology Karnataka(NITK)SurathkalSrinivasanagarMangalore 575025KarnatakaIndia

AZ31 wrought magnesium alloys are light weight materials which play an important role in order to reduces the environmental burdens in modern society because of its high strength to weight ratio,corrosion resistance,and stiffness and *** of this material are mainly in structural component i.e.,in constructions,automobile,aerospace,electronics and marine *** the present work,the microstructure characterization of the AZ31 alloys up to four ECAP passes at temperature of 573 K was observed for route *** grain size of the material was reduced from 31.8μm to 8μm after four ECAP *** properties of the alloy improved with increase in number of ECAP ***,X-ray diffraction analysis was carried out for as received and ECAP processed material.

关键词： ECAP AZ31 alloy Grain refinement Microstructure Mechanical properties XRD

Advancing sustainability:Magnesium-based solutions for environmental challenges and high-performance technologies in superconductivity

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Journal of Magnesium and Alloys 2024年第4期12卷 1257-1259页

作者： muralidhar Miryala Materials for Energy and Environmental Laboratory Shibaura Institute of Technology3-7-5 ToyosuKoto-KuTokyo 135-8548Japan

The Journal of Magnesium and Alloys(JMA)is actively dedicated to addressing crucial issues related to energy con-servation,emission reduction,energy crises,and sustainable development[1].Magnesium,recognized as the lightest com-mercial structural metal and a promising energy storage ma-terial,holds immense potential in contributing to strategic objectives such as achieving“carbon neutrality”and the“emission peak”,thus mitigating the ongoing energy cri-sis[2].JMA diligently reports on various research fronts,including magnesium-based structural materials,magnesium batteries,magnesium-based hydrogen storage materials,and magnesium-based superconducting super magnets[3].

关键词： magnesium holds structural

Geochemistry of volcanic glass from Mahanadi offshore region,eastern continental margin of India:Constraints on the contribution of latest Toba super-eruption

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Acta Oceanologica Sinica 2024年第2期43卷 111-119页

作者： muralidhar Kocherla Durbar Ray Manavalan Satyanarayanan Hilda Joao Virsen Gaikwad PB Ramamurty CSIR-National Institute of Oceanography Dona Paula 403004GoaIndia CSIR-National Geophysical Research Institute Uppal RoadHyderabad 500007India

The tephra layers in multiple sediment cores from the offshore region of the Mahanadi basin in the northern Bay of Bengal were investigated for possible volcanic sources. The glass shards from those tephra layers were studied for size distribution, texture, and elemental geochemistry to establish chronostratigraphic markers for regional and global Quaternary correlation. The textural features of fine-grained(silty) volcanic glasses suggest the distal source of these tephra deposits. Major element composition with elevated SiO_(2) contents ranging between75%–76% and dominance of K_(2)O(> 4.5%) over CaO(< 0.9%) suggest ashes have originated from siliceous rhyolitic melts, similar to the petrographic composition of tephra from the Toba volcano. The bulk trace element compositions of the same glass shards were comparable with those reported in the youngest Toba tephra reported elsewhere. Likewise, the LREE-dominated chondrite normalized REE profiles of tephra from the Mahanadi basin closely resemble the characteristic REE patterns in Toba ash from other parts of the Indian Ocean and thus confirmed the contribution of the youngest Toba super-eruption for this ash layers.

关键词： Mahanadi basin Bay of Bengal volcanic glass glass morphology glass-chemistry

Effect of local longitudinal shortening on the transport of luminal contents through small intestine

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Acta Mechanica Sinica 2019年第1期35卷 45-60,I0002页

作者： Ravi Kant avvari Sasi Institute of Technology and Engineering Tadepalligudem 534101India

A theoretical analysis of the rheological fluid flow due to peristalsis is studied. We have applied the classical lubrication theory to predict the near physiological behavior of the intestinal segment, mixing and transport. A parametric study involving the changes in local longitudinal shortening (LLS) magnitude, LLS spacing, fluid viscosity, wavelength of the wave, and occlusion of lumen caused by the wave provided insights into the dynamics of the peristalsis flow of a non-Newtonian fluid. LLS appear to have little significance in modulating the flow patterns that are caused by circular contraction alone. Results also indicate that there exists trade-off between the power requirement for peristalsis at a certain occlusion against the percentage LLS. LLS appear to be more advantageous to perform the peristalsis activity at higher occlusion than lower occlusion. Having mucosal folds in the inner lining of the intestine allows for one more advantage of slowing the transit due to increased friction factor and increase in time for absorption of the nutrients.

关键词： Circular contraction Local longitudinal shortening Lubrication theory

Pinning Characteristics in a Single Crystal Nd-123 Superconductors at Low, Intermediate and High Temperatures Using Flux Creep-Flow Model

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Journal of Physical Science and Application 2012年第7期2卷 233-239页

作者： Mohammed Nasim Hasan Teruo Matsushita Miryala muralidhar Department of Physics University of Chittagong Chittagong 4331 Bangladesh Department of Computer Science and Electronics Kyushu Institute of Technology lizuka 820-8502 Japan Senior Scientific Officer Superconductivity Research Laboratory Tokyo 105-0023 Japan

The pinning characteristics of a single crystal NdBa2Cu3Oy superconductor at low (40 K), intermediate (77.3 K) and high (88 K) temperatures were investigated. The experimental results of the critical current density Jc and the apparent pinning potential * 0 U which estimated from magnetic relaxation measurements are compared with the theoretical analysis based on the flux creep-flow model, taking the distribution of the flux pinning strength into account. The number of flux lines in the flux bundle (g2), the most probable value of pinning strength (Am), distribution width of pinning strength (σ2) and other pinning parameters such as m, γ, δ are determined so that a good fit is obtained between the experimental and theoretical results. The behavior of these parameters is discussed in correspondence to the pinning characteristics of low, intermediate and high temperatures. The observed results are approximately consistent with the theoretical predictions of Brandt et al. model of the order-disorder transition.

关键词：流动模型磁通蠕动超导体特性磁通钉扎晶体管脚高温

Hydrogeochemistry and Groundwater Quality Assessment of Rapur Area, Andhra Pradesh, South India

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Journal of Geoscience and Environment Protection 2016年第4期4卷 88-99页

作者： Arveti Nagaraju P. muralidhar Y. Sreedhar Department of Geology S V University Tirupati India

The assessment of the quality of groundwater in Rapur area of Nellore District has been carried out with an objective to determine the hydrogeochemical validity. A total of 30 samples of groundwater were collected from wells occurring in the study area. The analyzed physicochemical parameters such as pH, electrical conductivity, total dissolved solids, silica, calcium, magnesium, sodium, potassium, bicarbonate, carbonate, sulfate, and chloride are used to characterize the ground-water quality and its suitability for drinking and irrigational uses. Based on the analytical results, chemical indices like sodium absorption ratio (SAR), adjusted SAR, percent sodium (Na %), potential salinity, residual sodium carbonate (RSC), permeability index (PI), chloroalkaline indices, Kelly’s ratio, magnesium ratio and Gibbs ratios have been calculated. Chadha rectangular and diagram for geochemical classification and hydrochemical processes of groundwater indicated that most of the waters are Na-Cl and Ca-Mg-Cl types. The Gibb’s plot indicates that the groundwater chemistry of the study area is mainly controlled by rock-water interaction.

关键词： Groundwater Hydrochemistry Quality Assessment Rapur South India

α-Fe_2O_3 nanoparticles:An efficient,inexpensive catalyst for the one-pot preparation of 3,4-dihydropyrano[c]chromenes

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Chinese Chemical Letters 2011年第2期22卷 143-146页

作者： H.Nagabhushana S.Sandeep Saundalkar L.muralidhar B.M.Nagabhushana C.R.Girija D.Nagaraja M.A.Pasha V.P.Jayashankara Department of PG Studies in Physics and Research University Science CollegeTumkur UniversityTumkur 572103India Department of Chemistry SSMRV CollegeChemistry Research CenterBangalore 560041India Department of Chemistry M.S.Ramaiah Institute of TechnologyBangalore 560054India Department of PG Studies in Chemistry and Research University Science CollegeTumkur UniversityTumkur 572103India Department of Chemistry Central College CampusBangalore UniversityBangalore 560001India

This paper describes the combustion synthesis ofα-Fe2O3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano[c]*** combustion derivedα-Fe_2O_3 nanopowder was characterized by powder X-ray diffraction（PXRD）,Braunauer,Emmett and Teller（BET） surface area,scanning electron microscopy（SEM） and Fourier transform infrared spectroscopy（FTIR）.Highly efficient,three-component condensation of aromatic aldehyde,malanonitrile and 4- hydroxycoumarin catalyzed byα-Fe2O3 nanoparticles at room temperature is *** method offers an excellent alternative to the synthesis of 3,4-dihydropyrano[c]*** reactions are rapid,clean,and the products with good yield and high purity.

关键词： α-Fe2O3 nanopowder One pot three-component condensation Aromatic aldehyde Malanonitrile 4-Hydroxycoumarin

熔融织构(Nd-Eu-Gd)-Ba-Cu-O超导体的各向异性磁通跳跃及其不稳定性研究

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物理学报 2005年第5期54卷 2307-2312页

作者：池长昀张金仓李领伟刘芬黎文峰敬超曹世勋 Miryala muralidhar 姚忻上海大学物理系上海200436 Superconductivity Research Laboratory(SRL) ISTECJapan 上海交通大学物理系上海200436

对c轴择优取向的熔融织构样品 (Nd0 33Eu0 33Gd0 33)Ba2 Cu3O7-δ(含Gd(2 11)相 )的磁通跳跃现象进行了系统研究 .结果表明 ,在外加磁场平行于样品c轴条件下 ,在 2到 3K的温度范围内明显观测到了部分磁通跳跃现象 ,而在5K及以上温区... 详细信息

对c轴择优取向的熔融织构样品 (Nd0 33Eu0 33Gd0 33)Ba2 Cu3O7-δ(含Gd(2 11)相 )的磁通跳跃现象进行了系统研究 .结果表明 ,在外加磁场平行于样品c轴条件下 ,在 2到 3K的温度范围内明显观测到了部分磁通跳跃现象 ,而在5K及以上温区并未出现 .在磁场垂直于样品的c轴情况 ,在 2K到Tc 的整个温区都没有观察到磁通跳跃现象 .这种各向异性磁通跳跃现象可归因于各向异性钉扎力和几何退磁因子的结果 .随着温度的增加 ,磁通跳跃数目减少 ,且M(H)曲线的第三象限是磁通跳跃的最不稳定过程 .最后 ,研究了磁通跳跃对磁场扫描速率的依赖关系 ,并讨论了磁通蠕动对磁通跳跃的影响 .

关键词：超导体熔融织构各向异性磁通跳跃

Deep learning based detection of monkeypox virus using skin lesion images

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Medicine in Novel Technology and Devices 2023年第2期18卷 234-246页

作者： Tushar Nayak Krishnaraj Chadaga Niranjana Sampathila Hilda Mayrose Nitila Gokulkrishnan muralidhar Bairy G Srikanth Prabhu Swathi K.S Shashikiran Umakanth Department of Biomedical Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka576104India Department of Computer Science and Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka576104India Prasanna School of Public Health Manipal Academy of Higher EducationManipalKarnataka576104India Department of Medicine Dr.T.M.A.Pai HospitalManipal Academy of Higher EducationUdupiKarnataka576101India

As we set into the second half of 2022,the world is still recovering from the two-year COVID-19 ***,over the past three months,the outbreak of the Monkeypox Virus(MPV)has led to fifty-two thousand confirmed cases and over one hundred *** caused the World Health Organisation to declare the outbreak a Public Health Emergency of International Concern(PHEIC).If this outbreak worsens,we could be looking at the Monkeypox virus causing the next global *** Monkeypox affects the human skin,the symptoms can be captured with regular *** samples of these images can be used as a training dataset for machine learning-based detection *** a regular camera to capture the skin image of the infected person and running it against computer vision models is *** this research,we use deep learning to diagnose monkeypox from skin lesion *** a publicly available dataset,we tested the dataset on five pre-trained deep neural networks:GoogLeNet,Places365-GoogLeNet,SqueezeNet,AlexNet and *** was done to choose the best *** metrics such as accuracy,precision,recall,f1-score and AUC were *** the above models,ResNet18 was able to obtain the highest accuracy of 99.49%.The modified models obtained validation accuracies above 95%.The results prove that deep learning models such as the proposed model based on ResNet-18 can be deployed and can be crucial in battling the monkeypox *** the used networks are optimized for efficiency,they can be used on performance limited devices such as smartphones with *** addition of explainable artificial intelligence techniques LIME and GradCAM enables visual interpretation of the prediction made,helping health professionals using the model.

关键词： Deep learning Disease diagnosis Image processing Monkeypox virus Machine learning Transfer learning