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63篇 您的检索式:作者名="Kumar Devendra"
    题名 作者 年代 出处 被引量
1Multi-modality imaging review of congenital abnormalities of kidney and upper urinary tract显示文摘Congenital abnormalities of the kidney and urinary tract(CAKUT) include a wide range of abnormalities ranging from asymptomatic ectopic kidneys to life threatening renal agenesis(bilateral). Many of them are detected in the antenatal or immediate postnatal with a significant proportion identified in the adult population with varying degree of severity. CAKUT can be classified on embryological basis in to abnormalities in the renal parenchymal development, aberrant embryonic migration and abnormalities of the collecting system. Renal parenchymal abnormalities include multi cystic dysplastic kidneys, renal hypoplasia, number(agenesis or supernumerary), shape and cystic renal diseases. Aberrant embryonic migration encompasses abnormal location and fusion anomalies. Collecting system abnormalities include duplex kidneys and Pelvi ureteric junction obstruction. Ultrasonography(US) is typically the first imaging performed as it is easily available, noninvasive and radiation free used both antenatally and postnatally. Computed tomography(CT) and magnetic resonance imaging(MRI) are useful to confirm the ultrasound detected abnormality, detection of complex malformations, demonstration of collecting system and vascular anatomy and more importantly for early detection of complications like renal calculi, infection and malignancies. As CAKUT are one of the leading causes of end stage renal disease, it is important for the radiologists to be familiar with the varying imaging appearances of CAKUT on US, CT and MRI, thereby helping in prompt diagnosis and optimal management.Subramaniyan Ramanathan Devendra Kumar Maneesh Khanna Mahmoud Al Heidous Adnan Sheikh Vivek Virmani Yegu Palaniappan 2016World Journal of Radiology2016,8,2:13
2Role of Moringa oleifera in regulation of diabetes-induced oxidative stress显示文摘Objective:To evaluate the antioxidant activity of aqueous extract of Atoringa oleifeta M.oleifera) young leaves by in vivo as well as in vitro assays.Methods:In vitro study included estimation of total phenolic,total ilavonol,total flavonoid and total antioxidant power(FRAP assay).Tn addition, in vivo study was done with the identified most effective dose of 200 nig/kg of its lyophilized powder on normal and diabetic rats.Its effect on different oxidative free radical scavenging enzymes,viz,superoxide dismutase(SOD),catalase(CAT),glutathione-S-transferase(GST),lipid peroxide(LPO) contents were measured.Results:Significant increase in activities of SOD.CAT, GST while,a decrease in LPO content was observed.Whereas,total phenolic,flavonoid and ilavonol contents in the extract were found to be 120 mg/g of CAK,40.5 mg/g of QEK and 12.12 mg/g of QE,respectively.On the other hand.FRAP assay results of M.oleifera leaves was(85.00±5.00)μM of Fe^+/g of extract powder.Conclusions:The significant antioxidant activities of M.oleifera leaves from both in vivo as well as in vitro studies suggests that the regular intake of its leaves through diet can protect normal as well as diabetic patients against oxidative damage.Dolly Jaiswal Prashant Kumar Rai Shikha Mehta Sanjukta Chatterji Surekha Shukla Devendra Kumar Rai Gaurav Sharma Bechan Sharma Shahidul khair Geeta Watal 2013Asian Pacific Journal of Tropical Medicine2013,6,6:11
3Minimally invasive osteosynthesis of distal tibial fractures using anterolateral locking plate: Evaluation of results and complications显示文摘Devendra Lakhotia Gaurav Sharma Kavin Khatri G.N. Kiran Kumar Vijay Sharma Kamran Farooque 2016Chinese Journal of Traumatology2016,19,1:11
4Lead Induced Oxidative Stress: Beneficial Effects of Kombucha Tea显示文摘To evaluate the effect of oral administration of Kombucha tea (K-tea) on lead induced oxidative stress. Methods Sprague Dawley rats were administered 1 mL of 3.8% lead acetate solution daily alone or in combination with K-tea orally for 45 d, and the antioxidant status and lipid peroxidation were evaluated. Results Oral administration of lead acetate to rats enhanced lipid peroxidation and release of creatine phosphokinase and decreased levels of reduced glutathione (GSH) and antioxidant enzymes (superoxide dismutase, SOD and glutathione peroxidase, GPx). Lead treatment did not alter humoral immunity, but inhibited DTH response when compared to the control.Lead administration also increased DNA fragmentation in liver. Oral administration of Kombucha tea to rats exposed to lead decreased lipid peroxidation and DNA damage with a concomitant increase in the reduced glutathione level and GPx activity. Kombucha tea supplementation relieved the lead induced immunosuppression to appreciable levels. Conclusion The results suggest that K-tea has potent antioxidant and immunomodulating properties.P.DIPTI B.YOGESH A.K.KAIN T.PAULINE B.ANJU M.SAIRAM B.SINGH S.S.MONGIA G.ILAVAZHAGAN DEVENDRA KUMAR W.SELVAMURTHY 2003Biomedical and Environmental Sciences2003,16,3:6
5Effect of sample size on the fluid flow through a single fractured granitoid显示文摘Most of deep geological engineered structures,such as rock caverns,nuclear waste disposal repositories,metro rail tunnels,multi-layer underground parking,are constructed within hard crystalline rocks because of their high quality and low matrix permeability.In such rocks,fluid flows mainly through fractures.Quantification of fractures along with the behavior of the fluid flow through them,at different scales,becomes quite important.Earlier studies have revealed the influence of sample size on the confining stress-permeability relationship and it has been demonstrated that permeability of the fractured rock mass decreases with an increase in sample size.However,most of the researchers have employed numerical simulations to model fluid flow through the fracture/fracture network,or laboratory investigations on intact rock samples with diameter ranging between 38 mm and 45 cm and the diameter-to-length ratio of 1:2 using different experimental methods.Also,the confining stress,σ_3,has been considered to be less than 30 MPa and the effect of fracture roughness has been ignored.In the present study,an extension of the previous studies on 'laboratory simulation of flow through single fractured granite' was conducted,in which consistent fluid flow experiments were performed on cylindrical samples of granitoids of two different sizes(38 mm and 54 mm in diameters),containing a 'rough walled single fracture'.These experiments were performed under varied confining pressure(σ_3=5-40 MPa),fluid pressure(f_p ≤25 MPa),and fracture roughness.The results indicate that a nonlinear relationship exists between the discharge,Q,and the effective confining pressure,σ_(eff),and Q decreases with an increase in σ_(eff).Also,the effects of sample size and fracture roughness do not persist when σ_(eff)≥ 20 MPa.It is expected that such a study will be quite useful in correlating and extrapolating the laboratory scale investigations to in-situ scale and further improving theoretical/numerical models associated with fluid flow through rock masses.Kunal Kumar Singh Devendra Narain Singh Ranjith Pathegama Gamage 2016Journal of Rock Mechanics and Geotechnical Engineering2016,8,3:5
6Dual split and dislocation——a variant of Schatzker type-I tibial plateau fracture: A case report显示文摘Schatzkter type-I tibial plateau fracture is a split fracture of the lateral tibial plateau in sagittal plane,consequent to valgus impaction caused by low velocity of trauma.However,a deep understanding of the different columns of the tibial plateau and patho-mechanisms of the injury led to the unmasking of atypical fractures around the tibial plateau.We have encountered 2 cases with unusual fracture pattern of the lateral tibial condyle caused by road traffic accidents.The fracture pattern and severity of injury deviate from the original description of Schatzker type 1;in view of dual plane split,there is rotation of the posterolateral column fragment along its sagittal plane plus grade-III medial collateral ligament injury.The patients were initially treated with knee spanning external fixator and after a latency of 5 days,definitive fracture specific fixation was done,combined with repair of grade-III medial collateral ligament injury.At the 6 months follow-up both the patients achieved satisfactory knee functions(knee society score case 1:100 and case 2:92)and returned to their jobs.The severity of fracture pattern and displacement as described should prompt for examination of associated ligament injury.Because of timely diagnosis,early and appropriate care promised an excellent function outcome even in such a severe nature of knee injury.To prompt the description of injury pattern we coined the name'dual split and dislocation'of lateral tibial plateau,as a complex injury variant of split fracture of lateral tibial plateau fracture.Devendra Kumar Chouhan Aman Hooda 2022Chinese Journal of Traumatology2022,25,1:3
7Numerical study of fractional model of multi-dimensional dispersive partial differential equation显示文摘This article is devoted to a newly introduced numerical method for time-fractional dispersive partial differential equation in a multidimensional space.The time-fractional dispersive partial differential equation plays a great role in solving the problems arising in ocean science and engineering.The numerical technique comprises of Sumudu transform,homotopy perturbation scheme and He’s polynomial,namely homotopy perturbation Sumudu transform method(HPSTM)is efficiently used to examine time-fractional dispersive partial differential equation of third order in multi-dimensional space.The approximate analytic solution of the time-fractional dispersive partial differential equation of third-order in multi-dimensional space obtained by HPSTM is compared with exact solution as well as the solution obtained by using Adomain decomposition method.The results derived with the aid of two techniques are in a good agreement and consequently these techniques may be considered as an alternative and efficient approach for solving fractional partial differential equations.Several test problems are experimented to confirm the accuracy and efficiency of the proposed methods.Vijay Verma Amit Prakash Devendra Kumar Jagdev Singh 2019Journal of Ocean Engineering and Science2019,4,4:2
8FDTD based transition time dependent crosstalk analysis for coupled RLC interconnects显示文摘The performance of high density chips operating in the GHz range is mostly affected by on-chip interconnects. The interconnect delay depends on many factors, a few of them are inputs toggling patterns, line &coupling parasitics, input rise/fall time and source/load characteristics. The transition time of the input is of prime importance in high speed circuits. This paper addresses the FDTD based analysis of transition time effects on functional and dynamic crosstalk. The analysis is carried out for equal and unequal transition times of coupled inputs.The analysis of the effects of unequal rise time is equally important because practically, it is quite common to have mismatching in the rise time of the signals transmitting through different length wires. To demonstrate the effects,two distributed RLC lines coupled inductively and capacitively are taken into consideration. The FDTD technique is used because it gives accurate results and carries time domain analysis of coupled lines. The number of lumps in SPICE simulations is considered the same as those of spatial segments. To validate the FDTD computed results,SPICE simulations are run and results are compared. A good agreement of the computed results has been observed with respect to SPICE simulated results. An average error of less than 3.2% is observed in the computation of the performance parameters using the proposed method.Devendra Kumar Sharma Brajesh Kumar Kaushik R.K.Sharma 2014Journal of Semiconductors2014,35,5:2
9Probing the degradation of pharmaceuticals in urine using MFC and studying their removal efficiency by UPLC-MS/MS显示文摘Nutrient recovery from source-separated human urine has attracted interest as it is rich in nitrogen and phosphorus that can be utilized as fertilizer.However,urine also contains pharmaceuticals,steroid hormones,etc.and their removal is crucial as they have detrimental effects on the environment and human health.The current study focuses on investigating the degradation of pharmaceuticals using a double-chamber microbial fuel cell(MFC).Urine was spiked with four pharmaceuticals(trimethoprim,lamivudine,levofloxacin,and estrone)at a concentration of 2 mg/mL.The MFC was operated for 7 months in batch mode with this spiked urine as feed.The degradation efficiency of the MFC was studied,for which a selective liquid chromatography-tandem mass-spectrometric method was developed for the quantitation of compounds used in the spiking experiments and was validated with a lower limit of quantification of 0.39 ng/mL.The maximum removal rate achieved was 96%±2%.The degradation mechanism involved processes like sorption and anoxic biodegradation.The voltage curve obtained showed that the presence of pharmaceuticals had an initial negative impact on power generation along with increased organic content;however,after the reactor acclimatization,increased power output was achieved with maximum organics removal at 30 h of retention time.This work opens a new perspective for the anoxic biodegradation of pharmaceuticals and can be useful in future bioremediation studies.Priya Sharma Devendra Kumar Srikanth Mutnuri 2021Journal of Pharmaceutical Analysis2021,11,3:2
10The Impingement Heat Transfer Data of Inclined Jet in Cooling Applications: A Review显示文摘On the impingement heat transfer data,the experimental studies of air and liquid jets impingement to the flat surfaces were collected and critically reviewed.The oblique impingements of both single circular and planar slot jets were considered in particular.The review focused on the surface where the jet impingement cooling technique was utilized.The nozzle exit Reynolds numbers based on the hydraulic diameter varied in the range of 1,500–52,000.The oblique angles relative to the plane surface and the dimensionless jet-to-plate spacing vary in the range of 15°–90°and 2–12 respectively.The review suggested that the magnitude of maximum heat transfer shifted more for air jets compared with the liquid jets.The drop in the inclination angle and the jet-to-plate separation led to the increase in the asymmetry of heat transfer distribution.The displacement of maximum Nusselt number(heat transfer)locations was found to be sensitive to the inclination angle and the smaller jet-to-plate distance.Also,the Nusselt number correlations proposed by various researchers were discussed and compared with the results of the cited references.PAWAR Shashikant PATEL Devendra Kumar 2020Journal of Thermal Science2020,29,1:2
11Effect of K2O addition on crystallization and microstructural behaviour of the strontium titanate-borosilicate glass-ceramic system显示文摘THAKUR O P KUMAR Devendra PARKASH Om etal 1995Mater Lett1995,23,:2
12Polysiloxane-based core-shell microspheres for toughening of epoxy resins显示文摘Prasun Kumar Roy Nahid Iqbal Devendra Kumar Chitra Rajagopal 2014Journal of Polymer Research2014,,1:1
13Preparation and characterization of barium stannate BaSnO3显示文摘SHAIL Upadhyay Om Parkash Devendra Kumar 1997Journal of Materials Science Letters1997,,16:1
14Occurrence of phthalic acid esters in Gomti River Sediment, India显示文摘Abhinav Srivastava Vinod P. Sharma Ranu Tripathi Rakesh Kumar Devendra K. Patel Pradeep Kumar Mathur 2010Environmental Monitoring and Assessment (-)2010,,1:1
15闪光对于减轻静脉置管痛的作用:一项前瞻性随机安慰剂对照研究显示文摘背景尽管静脉置管时的疼痛经常让人备受困扰,但通常都是在没有任何镇痛措施下进行静脉置管的。临床上曾尝试用一些药物和非药物方法来减轻静脉置管的疼痛,但结果各异。本研究拟评价一次闪光对于减轻静脉置管痛的效果。方法90例拟择期行腹腔镜胆囊切除术的ASAⅠ~Ⅱ级的成年患者(15~60岁),随机分为3组,每组30例,组1为对照组;组2为分散注意力组,即在非优势手的手背静脉进行置管前给患者照相而不使用闪光;组3为闪光组,静脉置管前照相并且使用闪光;在照相后立即使用18G的穿刺针进行静脉置管。结果每组均有2例患者首次静脉穿刺失败,在数据分析中即予以剔除,闪光组疼痛的发生率为50%(28例中14例发生),其他2组为100%(28例全部发生),通过视觉模拟评分评估的疼痛严重程度分散注意力组和闪光组显著低于对照组,而闪光组也显著低于分散注意力组。结论静脉置管前使用闪光是一种减轻疼痛的安全而简单有效的方法。Anil Agarwal GhanshvamYadav Devendra Gupta Manish Tandon Prabhat Kumar Singh Uttam Singh 吴志林(译) 2009麻醉与镇痛2009,,3:1
16Melatonin or silymarin reduces maneb-and paraquat-induced Parkinson's disease phenotype in the mouse显示文摘Naveen Kumar Singhal Garima Srivastava Devendra Kumar Patel etal 2011J Pineal Res2011,50,2:1
17A new chlorophycean nickel hyperaccumulator 显示文摘Harish S Sundaramoorthy Devendra Kumar 2008Bioresource Technology2008,,99:1
18A method for judicious fusion of inconsistent multiple sensor data显示文摘Manish Kumar Devendra P Garg Randy A Zachery 2007IEEE Sensors Journal2007,,5:1
19Structural and relaxor behavior of (Ba 1? x La x )(Ti 0.85 Sn 0.15 )O 3 ceramics obtained by solid state reaction显示文摘Sindhu Singh Prabhakar Singh Om Parkash Devendra Kumar 2010Journal of Alloys and Compounds2010,,1:1
20Effects of stenoses on non-Newtonian flow of blood in blood vessels显示文摘Om Prakash O. D. Makinde S. P. Singh Nidhi Jain Devendra Kumar 2015International Journal of Biomathematics2015,8,1:1
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