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Journal of minerals and materials Characterization and Engineering 2015年第1期3卷 26-36页

作者： Subhash Kamal Korada Viswanath sharma A. m. Abdul-Rani Department of mechanical Engineering Universiti Teknologi PETRONAS Tronoh Malaysia Centre for Intelligent Signal & Imaging Research Universiti Teknologi PETRONAS Tronoh Malaysia

Hot corrosion is a serious problem in aircraft, marine, industrial and land-base gas turbines. To obviate these problems, superalloy superfer 800H (midhani grade) is one of the prominent materials for the high temperature applications. The present work investigates hot corrosion behaviour of superfer 800H exposed to two different molten salt environments Na2SO4 + 60% V2O5 and Na2SO4 + 5% V2O5 + 5% NaCl respectively, at 900oC under cyclic conditions. The weight change measurements made on during the experiments are used to determine the kinetics of hot corrosion. It is observed that the formation of scale rich in Cr2O3, NiO and spinel NiCr2O4 has contributed for the better hot corrosion resistance of superfer 800H. Inspection for 10, 20, 35 and 50 cycles reveals that after 10 cycles Crack has been initiated in the scale and it is clearly visible in the presence of NaCl salt. On subsequent cycles, crack propagates perpendicular to surface and as it encounters inclusions.

关键词： Hot Corrosion Superalloy Superfer 800H Cyclic Conditions Spinel NiCr2O4

“Contrast nephropathy” in renal transplantation:Is it real?

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World Journal of Transplantation 2016年第4期6卷 682-688页

作者： Fedaey mohammed Abbas Bridson m Julie Ajay sharma Ahmed Halawa Nephrology Department Jaber El Ahmed Military Hospital Faculty of Health and Science University of Liverpool Institute of Learning and Teaching School of Medicine Royal Liverpool University Hospital Sheffield Teaching Hospitals

The risk of contrast-induced nephropathy(CIN) in renal transplant recipients is increased in diabetics, patients with impaired basal kidney function, patients in shock, patients presenting with acute emergency and in old age recipients. Approximately one-third of all hospitalized patients with acute kidney injury is attributed to CIN. In the United States, it is the third leading cause of hospital-acquired renal failure. Therefore, efforts should be directed to minimize CIN-related morbidity and mortality as well as to shorten hospital stay. While the role of peri-procedural prophylactic hydration with saline is unequivocal; the use of acetyl cysteine is not based on robust evidence. The utility of theophylline, aminophylline, calcium channel blockers, natriuretic peptide, and diuretics does not have proven role in attenuating CIN incidence. We aim to analyze the evidence for using various protocols in published literature to limit CIN-associated morbidity and mortality, particularly during surveillance of the renal allograft survival.

关键词： Contrast Renal Transplantation Nephropathy

Screening of field pea (Pisum sativum) selections for their reactions to root-knot nematode (meloidogyne incognita)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第3期7卷 209-214页

作者： sharma Anita HASEEB Akhtar ABUZAR Syed Department of Plant Protection Faculty of Agricultural Sciences Aligarh Muslim University Aligarh-202002 India

Pot studies were carried out to evaluate the reactions of 23 selections of field pea （Pisum sativum） against meloidogyne incognita （2000 freshly hatched juveniles （J2）/pot）. Experiment was conducted under greenhouse conditions （（24.7±3） ℃ and （62±7）% RH） and terminated 45 d after inoculation. The roots of all the selections were assessed to determine root-knot indices （RKI） on a 0-4 scale. Out of 23 selections HFP-990713, Pant P-25, and HFP-0129 were resistant; Pant P-2005, NDP-2 and Pant P-42 were tolerant; LFP-305, HFP-8909, HFP-4, HUP-31, HFP-0128, Pant P-31, Pant P-40, LFP-363, and HFP-0118 were moderately resistant; HFP-0110, HUDP-28, HUDP-15, HUDP-27, HUP-30, HUP-2 and HUDP-26 were moderately susceptible; and only Ambika was susceptible to m. incognita. It was observed that reproduction of nematode was favored on tolerant and susceptible cultivars but inhibited on resistant ones. Strong negative correlation was observed between the total fresh and dry plant weights and the root-knot index. The selection Pant P-42 showed highest tolerance among all the selections tested and can be recommended for field trials, whereas, selection Ambika showed highest susceptibility and should be avoided.

关键词： Pisum sativum meloidogyne incognita Resistance

Perfusability and immunogenicity of implantable pre-vascularized tissues recapitulating features of native capillary network

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Bioactive materials 2023年第12期30卷 184-199页

作者： Dhavan sharma Archita sharma Linghao Hu Te-An Chen Sarah Voon Kayla J.Bayless Jeremy Goldman Alex J.Walsh Feng Zhao Department of Biomedical Engineering Texas A&M UniversityCollege StationTXUnited States School of medicine Texas A&M UniversityCollege StationTXUnited States Department of Biomedical Engineering Michigan Technological UniversityHoughtonMIUnited States

Vascularization is a key pre-requisite to engineered anatomical scale three dimensional(3-D)constructs to ensure their nutrient and oxygen supply upon ***,engineered pre-vascularized 3-D tissues are limited to only micro-scale hydrogels,which meet neither the anatomical scale needs nor the complexity of natural extracellular matrix(ECm)*** scale perfusable constructs are critically needed for translational *** overcome this challenge,we previously developed pre-vascularized ECm sheets with long and oriented dense microvascular *** present study further evaluated the patency,perfusability and innate immune response toward these pre-vascularized ***-co-cultured prevascularized constructs were evaluated in vitro to confirm micro-vessel patency and perturbations in macrophage *** implanted pre-vascularized constructs remained viable and formed a functional anastomosis with host vasculature within 3 days of *** completely biological pre-vascularized construct holds great potential as a building block to engineer perfusable anatomical scale tissues.

关键词： Pre-vascularization micro-vasculature mesenchymal stem cells Extracellular matrix Fluorescence lifetime imaging

Energy loss at bends in the pneumatic conveying of fly ash

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Particuology 2015年第4期13卷 65-73页

作者： Naveen Tripathi Atul sharma S.S.mallick P.W.Wypych Department of mechanical Engineering Thapar University Faculty of Engineering and Information Sciences University of Wollongong

An accurate estimation of the total pressure drop of a pipeline is important to the reliable design of a pneumatic conveying system. The present paper presents results from an investigation into the modelling of the pressure drop at a bend in the pneumatic conveying of fly ash. Seven existing bend models were used （in conjunction with solids friction models for horizontal and vertical straight pipes, and initial acceleration losses） to predict the total pipeline pressure drop in conveying fly ash （median particle diameter： 30 }zm; particle density： 2300 kg/m^3; loose-poured bulk density： 700 kg/m3） in three test rigs （pipelines with dimensions of 69 mm inner diameter （I.D.） × 168 m length; 105 mm I.D. × 168 m length; 69 mm I.D. × 554 m length）. A comparison of the pneumatic conveying characteristics （PCC） predicted using the seven bend models and experimental results shows that the predicted total pipeline PCC and trends depend on the choice of bend model. While some models predict trends that agree with the experimental results, other models predicted greater bend pressure drops for the dense phase of fly ash than for the dilute phase. models of Pan, R. （1992）. Improving scale-up procedures for the design of pneumatic conveying systems. Doctoral dissertation, University of Wollongong, Australia, Pan, R., ＆ Wypych, P.W. （1998）. Dilute and dense phase pneumatic conveying of fly ash. In Proceedings of the sixth International Conference on Bulk materials Storage and Transportation （pp. 183-189）, Wollongong, NSW, Australia and Chambers, A.J., ＆ marcus, R.D. （1986）. Pneumatic conveying calculations. In Proceedings of the second International Conference on Bulk materials Storage and Transportation （pp. 49-52）, Wollongong, Australia reliably predicted the bend losses for systems conveying fly ash over a large range of air flows.

关键词： Pneumatic conveying Fluidised dense phase Bend Pressure drop Bend model

Source apportionment of Pm10 in Delhi, India using PCA/APCS, UNmIX and PmF

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Particuology 2018年第2期16卷 107-118页

作者： Srishti Jain S.K. sharma T.K. mandal mohit Saxena Environmental Sciences and Biomedical metrology Division CSIR-National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110 012 India Academy of Scientific and Innovative Research (AcSIR) CSIR-National Physical Laboratory campus New Delhi 110 012 India

Source apportionment of particulate matter （Pm10） measurements taken in Delhi, India between January 2013 and June 2014 was carried out using two receptor models, principal component analysis with absolute principal component scores （PCA/APCS） and UNmIX. The results were compared with previous estimates generated using the positive matrix factorization （PmF） receptor model to investigate each model＇s source-apportioning capability. All models used the Pm10 chemical composition （organic carbon （OC）, elemental carbon （EC）, water soluble inorganic ions （WSIC）, and trace elements） for source apportionment. The average Pm10 concentration during the study period was 249.7±103.9 μg/m3 （range： 61.4-584.8 μg/m3）. The UNmIX model resolved five sources （soil dust （SD）, vehicular emissions （VE）, secondary aerosols （SA）, a mixed source of biomass burning （BB） and sea salt （SS）, and industrial emissions （IE））. The PCA/APCS model also resolved five sources, two of which also included mixed sources （SD, VE, SD＋SS, （SA＋BB＋SS） and 1E）. The PmF analysis differentiated seven individual sources （SD, VE, SA, BB, SS, IE, and fossil fuel combustion （FFC））. All models identified the main sources contributing to Pm10 emissions and reconfirmed that VE, SA, BB, and SD were the dominant contributors in Delhi.

关键词： Receptor model PCA/APCS UNmIX PmF Source apportionment

New technologies to investigate the brain-gut axis

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World Journal of Gastroenterology 2009年第2期15卷 182-191页

作者： Abhishek sharma Dina Lelic Christina Brock Peter Paine Qasim Aziz Department of Gastrointestinal Science University of Manchester Manchester M13 9PL United Kingdom Neurogastro-enterology Group Wingate Institute of Neurogastroenterology Barts and the London School of Medicine and Dentistry London E1 2AJ United Kingdom mech-Sense Department of Gastroenterology Aalborg Hospital Boulevarden 13 DK-9000 Aalborg Denmark

Functional gastrointestinal disorders are commonly encountered in clinical practice, and pain is their commonest presenting symptom. In addition, patients with these disorders often demonstrate a heightened sensitivity to experimental visceral stimulation, termed visceral pain hypersensitivity that is likely to be important in their pathophysiology. Knowledge of how the brain processes sensory information from visceral structures is still in its infancy. However, our understanding has been propelled by technological imaging advances such as functional magnetic Resonance Imaging, Positron Emission Tomography, magnetoencephalography, and Electroencephalography （EEG）. Numerous human studies have non-invasively demonstrated the complexity involved in functional pain processing, and highlighted a number of subcortical and cortical regions involved. This review will focus on the neurophysiological pathways （primary afferents, spinal and supraspinal transmission）, brainimaging techniques and the influence of endogenous and psychological processes in healthy controls and patients suffering from functional gastrointestinal disorders. Special attention will be paid to the newer EEG source analysis techniques. Understanding the phenotypic differences that determine an individual＇s response to injurious stimuli could be the key to understanding why some patients develop pain and hyperalgesia in response to inflammation/injury while others do not. For future studies, an integrated approach is required incorporating an individual＇s psychological, autonomic, neuroendocrine, neurophysiological, and genetic profile to define phenotypic traits that may be at greater risk of developing sensitised states in response to gut inflammation or injury.

关键词： Brain-gut axis Central processing Neuraxis Neurophysiology

Tribological Performance of Different Concentrations of Al_(2)O_(3)Nanofluids on minimum Quantity Lubrication milling

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Chinese Journal of mechanical Engineering 2023年第4期36卷 67-78页

作者： Xiufang Bai Juan Jiang Changhe Li Lan Dong Hafiz muhammad Ali Shubham.sharma School of mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China School of mechanical and Electrical Engineering Qingdao Binhai UniversityQingdao 266555China mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Department of mechanical Engineering IK Gujral Punjab Technical UniversityMain Campus-KapurthalaJalandhar 144603India

Nanofluid minimum quantity lubrication(NmQL)is a green processing *** oil is suitable as base oil because of excellent lubrication performance,low freezing temperature,and high ***_(2)O_(3)nanoparticles improve not only the heat transfer capacity but also the lubrication *** physical and chemical proper-ties of nanofluid change when Al_(2)O_(3)nanoparticles are ***,the effects of the concentration of nanofluid on lubrication performance remain ***,the mechanisms of interaction between Al_(2)O_(3)nanoparti-cles and cottonseed oil are *** this research,nanofluid is prepared by adding different mass concentrations of Al_(2)O_(3)nanoparticles(0,0.2%,0.5%,1%,1.5%,and 2%wt)to cottonseed oil during minimum quantity lubrication(mQL)milling 45 *** tribological properties of nanofluid with different concentrations at the tool/workpiece interface are studied through macro-evaluation parameters(milling force,specific energy)and micro-evaluation parameters(surface roughness,micro morphology,contact angle).The result show that the specific energy is at the minimum(114 J/mm^(3)),and the roughness value is the lowest(1.63μm)when the concentration is 0.5 wt%.The surfaces of the chip and workpiece are the smoothest,and the contact angle is the lowest,indicating that the tribological proper-ties are the best under 0.5 wt%.This research investigates the intercoupling mechanisms of Al_(2)O_(3)nanoparticles and cottonseed base oil,and acquires the optimal Al_(2)O_(3)nanofluid concentration to receive satisfactory tribological properties.

关键词： milling Al_(2)O_(3)nanofluid minimum quantity lubrication(mQL) Surface micromorphology

Status,structure and environmental variations in semi-arid mangroves of India

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Journal of Forestry Research 2020年第1期31卷 163-173页

作者： G.A.Thivakaran Seema B.sharma Abhiroop Chowdhury Arumugam murugan Coastal and marine Ecology Division Gujarat Institute of Desert EcologyBhujGujaratIndia Department of Earth and Environmental Sciences KSKV Kachchh UniversityMundra RoadBhujGujaratIndia Department of Chemistry Manipal University JaipurDehmi KalanJaipur-Ajmer Express WayJaipurRajasthan 303007India Central marine Fisheries Research Institute Mandapam Regional CentreMarine Fisheries P.OMandapam CampusRamanathapuramTamil Nadu 623520India

The semi-arid mangroves of the Gulf of Kachchh,the largest ecosystems on the west coast of India,are poorly studied in terms of vegetation structure and environmental parameters in spite of their conservation ***,it is necessary to document the structural features of these mangroves in view of ongoing coastal industrial *** forest structure in 10 locations on the northern and southern coasts of the Gulf of Kachchh were assessed using the line intercept transect *** included density of young and mature age classes,tree heights,diameters at breast height(DBH)and aboveground biomass,along with seven significant environmental *** tree densities ranged from 350 to 1567 ***-1,while average height and girth at breast height ranged from 1.0 to 6.8 m and 3.0 to 137.0 cm,*** majority of trees(55.6%)were in B 1.8 m height class followed by a 1.9 to 2.4 m class(25.1%).DBH was most often in class 2 cm or lower than *** the canopy index classes,more trees were recorded in class ≤2 *** regeneration density was greater than the recruitment *** study indicates that the poor structural attributes of Avicennia marina *** Stapf and mold dominated mangroves are largely due to aridity induced by scarce and erratic rainfall and high soil and water *** results should be valuable in conserving and sustainably managing these mangroves in the face of developmental activities.

关键词： mangroves Vegetation structure Abiotic factors Biodiversity Forest management Aboveground biomass Conservation