检索结果-南通市图书馆

Defence Technology（防务技术） 2023年第12期30卷 83-100页

作者： Bipin sankar Karthik V shankar Vamu sunil Hemanth Kashyap s Nikhil nair Adarsh A.nair Abhinav P M Department of Mechanical Engineering Amrita Vishwa VidyapeethamAmritapuriIndia

Cu-Ni-sn spinodal alloys(spinodal bronze)are potential materials with robust applications in components associated with defence applications like bearings,propellers,bushes,and shafts of heavily loaded aircraft,off-road vehicles,and *** paper presents a comparative study using water,Brine solution,and sAE 40 oil as the quenching media in regular bronze(Cu-6sn)and spinodal bronze(Cu-9Ni-6sn)*** analysis was conducted by optical microscopy,transmission electron microscopy(TEM),and X-ray diffraction technique(XRD)on bronze and spinodal bronze samples immersed in the three different quenching media to understand the grain size and hardness values *** analysis was performed to analyze the effect of quenching media on the wear aspects of bronze and spinodal bronze *** hardness value of the brine-aged spinodal bronze samples was as high as 320 Hv,and the grain size was very low in the range of 60μm.A quantitative comparison between brine-aged regular bronze and brine-aged spinodal bronze showed that the hardness(Hv)was almost 80%higher for brine-aged spinodal ***,the grain size was approximately 30%finer for spinodal bronze when compared with regular *** the load was increased in spinodal bronze samples,there was an initial dip in wear rate followed by a marginal *** was a steady increase in friction coefficient with a rise in load for brine-aged regular bronze and spinodal bronze *** results indicate that brine solution is the most effective quenching medium for cast Cu-Ni-sn spinodal alloys.

关键词： Quenching Water Brine sAE 40 oil Grain size Hardness Wear rate spinodal decomposition Cusn spinodal alloy CuNisn

Effect of adrenalectomy on rat epididymidis

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2002年第4期4卷 273-279页

作者： Neena nair R.s. Bedwal R.s. Mathur Cell Biology Laboratory Department of Zoology University of Rajasthan Jaipur-302 004 IndiaCell Biology Laboratory Department of Zoology University of Rajasthan Jaipur-302 004 IndiaCell Biology Laboratory Department of Zoology University of Rajasthan Jaipur-302 004 India

AIM: To investigate the effect of adrenalectomy (ADX) on the epididymidis of sprague-Dawley rats. METHODs: The histological, biochemical (cholesterol protein, zinc, copper, alkaline and acid phosphatase aryl sulphatase, lactic dehydrogenase and leucine amino peptidase) and hormonal (FsH, LH and testosterone) changes of caput and cauda epididymis in ADX rats were observed. REsULTs: Organ wet weight, histological studies and morphometric measurements indicated a cellular degeneration in caput and cauda epididymis of ADX rats. serum testosterone level was significantly lower in ADX than in sham-operated rats, while the serum FsH and LH were below the detection limit of 1 mIU/mL. The enzymatic activity was higher in ADX than in sham-operated rats. Epididymal zinc level increased whereas copper level decreased in ADX rats compared to the sham-operated. CONCLUsION: Adrenalectomy leads to degeneration of caput and cauda epididymidis epithelial cells as a result of decreased supply of testosterone.

关键词： Adrenalectomy Acid Phosphatase Alkaline Phosphatase Animals Arylsulfatases Cholesterol Comparative study Copper Epididymis Follicle stimulating Hormone L-Lactate Dehydrogenase Leucyl Aminopeptidase Luteinizing Hormone Male Organ size Rats Rats, sprague-Dawley Reference Values Research support, Non-U.s. Gov't Testosterone Time Factors Zinc

Effect of adrenalectomy and hydrocortisone on ventral prostate of rats

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2001年第4期3卷 289-300页

作者： Neena nair R.s.Bedwal R.s.Mathur Cell Biology Laboratory Department of Zoology University of Rajasthan Jaipur 302004 IndiaCell Biology Laboratory Department of Zoology University of Rajasthan Jaipur 302004 IndiaCell Biology Laboratory Department of Zoology University of Rajasthan Jaipur 302004 India

Aim: To study the effects of adrenalectomy and hydrocortisone on the ventral prostate of sD rats. Methods: Inadrenalectomised (ADX) and ADX + hydrocortisone (1, 2, or 4 mg) treated rats, the prostatic histology and thecholesterol, protein, zinc, and copper levels and the enzymic profile (acid phosphatase, alkaline phosphatase, aryl sul-phatase, lactic dehydrogenase, and leucine aminopeptidase) in the prostatic tissue were determined; the serum hormon-al profile (testosterone, FsH and LH) was also assayed. Results; Adrenalectomy caused a progressive degenerationin prostatic structure that was not reversed by hydrocortisone treatment. The serum testosterone were significantly lowerin ADX than in sham operated rats and lower in ADX + hydrocortisone than in ADX-C rats (P serumFsH and LH were below the detection limit of 1 mIU/mL. The enzymatic activity was higher in ADX than in sham op-erated rats and higher in ADX + hydrocortisone than in ADX-C rats (Pstatic zinc levels weresignificantly higher in sham operated than in ADX, and higher in ADX-C than in ADX + hydrocortisone rats (P static copper level was significantly lower in sham operated than in ADX, and lower in ADX-C thanin the ADX + hydrocortisone rats (P sion; In rats, adrenalectomy leads to pathological and func-tional changes of the prostate. Hydrocortisone treatment at the doses employed did not reverse these changes. (Asian JAndrol 2001 Dec; 3: 289 - 300)

关键词： adrenalectomy ventral prostate hydrocortisone testosterone FsH LH cholesterol zinc copper acid phosphatase alkaline phosphatase aryl sulphatase lactic dehydrogenase leucine aminopeptidase

Revisiting novel symmetries in coupled N=2 supersymmetric quantum systems:examples and supervariable approach

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第10期72卷 103-112页

作者： Aditi Pradeep Anjali s Binu M nair saurabh Gupta Department of Physics and Astronomy University of British ColumbiaVancouver Campus325-6224 Agricultural RoadVancouverBC V6T 1Z1Canada Department of Physics National Institute of Technology Calicut

We revisit the novel symmetries in N=2 supersymmetric quantum mechanical models by considering specific examples of coupled ***,we extend our analysis to a general case and list out all the novel *** each case,we show the existence of two sets of discrete symmetries that correspond to the Hodge duality operator of differential ***,we are able to provide a proof of the conjecture which points out the existence of more than one set of discrete symmetry transformations corresponding to the Hodge duality ***,we derive on-shell nilpotent symmetries for a generalized superpotential within the framework of supervariable approach.

关键词： N=2 sUsY quantum mechanical system continuous and discrete symmetries de Rham cohomological operators (anti-)chiral supervariable approach sUsY invariant restrictions

Enhanced cavitation erosion resistance of a friction stir processed high entropy alloy

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1353-1362页

作者： Rakesh B.nair H.s.Arora Harpreet singh Grewal surface science and Tribology Lab Department of Mechanical EngineeringShiv Nadar UniversityGautam Buddha NagarUttar Pradesh 203207India

Friction stir processing of an Al0.1CoCrFeNi high entropy alloy(HEA)was performed at controlled cooling conditions(ambient and liquid submerged).Microstructural and mechanical characterization of the processed and as-cast HEAs was evaluated using electron backscatter diffraction,micro-hardness testing and *** under the submerged cooling condition showed elongated grains(10μm)with fine equiaxed grains(2μm)along the boundary compared to the coarser grain(~2 mm)of as-cast *** hardness showed remarkable improvements with four(submerged cooling condition)and three(ambient cooling condition)times that of as-cast HEA(HV^150).The enhanced hardness is attributed to the significant grain refinement in the processed *** erosion behavior was observed for samples using an ultrasonication *** of the HEAs showed better cavitation erosion resistance than the stainless steel *** sample processed under a submerged liquid condition showed approximately 20 and 2 times greater erosion resistance than stainless steel 316L and ascast HEA,*** enhanced erosion resistances of the processed HEAs correlate to their increased hardness,resistance to plasticity,and better yield strength than the as-cast *** surface of the tested samples showed nucleation and pit growth,and plastic deformation of the material followed by fatigue-controlled disintegration as the primary material removal mechanism.

关键词： cavitation erosion microstructure mechanical properties surface engineering

The Quest toward limb regeneration:a regenerative engineering approach

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2016年第2期3卷 123-125页

作者： Cato T.Laurencin Lakshmi s.nair Department of Orthopaedic surgery Institute for Regenerative EngineeringRaymond and Beverly Sackler Center for BiomedicalBiologicalPhysical and Engineering SciencesUniversity of Connecticut HealthFarmingtonCT 06030USA Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA Department of Materials science and Engineering University of ConnecticutStorrsCT 06269USA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsCT 06269USA Department of Craniofacial sciences School of Dental MedicineUniversity of Connecticut HealthFarmingtonCT 06030USA.

The Holy Grail to address the clinical grand challenge of human limb loss is to develop innovative strategies to regrow the amputated *** remarkable advances in the scientific understanding of regeneration,stem cell science,material science and engineering,physics and novel surgical approaches in the past few decades have provided a regenerative tool box to face this grand challenge and address the limitations of human wound *** we discuss the convergence approach put forward by the field of Regenerative Engineering to use the regenerative tool box to design and develop novel translational strategies to limb regeneration.

关键词： regenerative engineering limb regeneration stem cells advanced biomaterial science clinical translation

Bagging with CTD–A Novel signature for the Hierarchical Prediction of secreted Protein Trafcking in Eukaryotes

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

Genomics, Proteomics & Bioinformatics 2013年第6期11卷 385-390页

作者： Geetha Govindan Achuthsankar s.nair Department of Computational Biology and Bioinformatics University of Kerala

Protein trafficking or protein sorting in eukaryotes is a complicated process and is carried out based on the information contaified in the protein. Many methods reported prediction of the subcellular location of proteins from sequence information. However, most of these prediction methods use a flat structure or parallel architecture to perform prediction. In this work, we introduce ensemble classifiers with features that are extracted directly from full length protein sequences to predict locations in the protein-sorting pathway hierarchically. sequence driven features, sequence mapped features and sequence autocorrelation features were tested with ensemble learners and their performances were compared. When evaluated by independent data testing, ensemble based-bagging algorithms with sequence feature composition, transition and distribution （CTD） successfully classified two datasets with accuracies greater than 90%. We compared our results with similar published methods, and our method equally performed with the others at two levels in the secreted pathway. This study shows that the feature CTD extracted from protein sequences is effective in capturing biological features among compartments in secreted pathways.

关键词： sequence driven features sequence mapped features Autocorrelation Ensemble classifiter Protein sorting

Revisiting cerebral endothelial cells in Alzheimer’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第10期20卷 2911-2912页

作者： Amira s.Hanafy Department of Neurosurgery University Hospital BonnBonnGermany

Alzheimer’s disease(AD)is the most common neurodegenerative disorder characterized by slow and progressive decline of cognitive and memory *** only approximately 5%of the cases,AD is familial,as often predisposed by genetic mutations(Hoogmartens et al.,2021),while sporadic AD accounts for approximately 95%of the *** amyloid cascade hypothesis is one of the fundamental hypotheses put out to explain AD pathogenesis as dysregulated homeostasis of amyloid-β(Aβ)peptides that leads to the accumulation of Aβplaques in the parenchyma,an anatomical hallmark of AD.

关键词： Alzheimer Aβ cerebral

Water entry and exit of axisymmetric bodies by CFD approach

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and science 2018年第2期3卷 156-174页

作者： Vinod V.nair s.K.Bhattacharyya Department of Ocean Engineering Indian Institute of Technology MadrasChennai 600036India

The water impact and subsequent entry of three rigid axisymmetric bodies,a sphere and two cones,in the early phase are simulated using CFD utilizing a VOF scheme to track the free surface and the results compared with the recent experimental results available in the *** penetration depth,vertical velocity and vertical acceleration time histories have been reproduced well by CFD with a wide choice of mesh density,whereas the peak pressure on impact required a much finer mesh and appropriate choice of the time *** an interaction region around the trajectory of the body with fine mesh and an adaptive time stepping strategy has worked well to capture the peak impact pressure accurately with reasonable computational ***‘full’motion of the sphere,which is buoyant,has also been simulated using CFD allowing its 6-dof motion for several cycles of entry and exit *** features of the behavior,especially the loss of symmetry of the trajectory,are discussed.

关键词： CFD Cone sphere Water entry Water impact