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232篇 您的检索式:作者名="Ajay Kumar"
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1Methane hydrate formation and dissociation in synthetic seawater显示文摘The formation and dissociation of methane gas hydrate at an interface between synthetic seawater (SSW) and methane gas have been experimentally investigated in the present work. The amount of gas consumed during hydrate formation has been calculated using the real gas equation. Induction time for the formation of hydrate is found to depend on the degree of subcooling. All the experiments were conducted in quiescent system with initial cell pressure of 11.14 MPa. Salinity effects on the onset pressure and temperature of hydrate formation are also observed. The dissociation enthalpies of methane hydrate in synthetic seawater were determined by Clausius-Clapeyron equation based on the measured phase equilibrium data. The dissociation data have been analyzed by existing models and compared with the reported data.Vikash Kumar Saw Iqbal Ahmad Ajay Mandal G.Udayabhanu Sukumar Laik 2012Journal of Natural Gas Chemistry2012,21,6:12
2微量元素对ABR发酵产氢产甲烷的影响显示文摘为构建厌氧折流板反应器(ABR)发酵联合产氢产甲烷系统,考察了微量元素对ABR系统前端格室发酵产氢、后端格室发酵产甲烷的影响。在进水COD为6 000 mg/L、碱度为1 900 mg/L的条件下,当未投加微量元素时,系统对COD的去除率为51%,产氢能力为0.46 m3/(m3.d),产甲烷能力为0.68 m3/(m3.d),四格室的厌氧污泥脱氢酶活性均较低;而在相同运行条件下,当投加微量元素后,系统对COD的去除率提高到62%以上,产氢能力为0.37 m3/(m3.d),产甲烷能力达到1.66 m3/(m3.d)。研究表明,投加微量元素可有效刺激ABR发酵联合产氢产甲烷系统中厌氧污泥的活性,由于ABR中产甲烷菌等耗氢菌群活性的增强导致发酵产氢作用受到抑制,但产甲烷活性的进一步增强,使系统的处理效能得到明显提高。郑国臣 赵峰 李建政 张照韩 昌盛 闫志成 AJAY Kumar Jha 2012中国给水排水2012,28,3:12
3Nonunion of coronal shear fracture of femoral condyle显示文摘大腿骨的髁的孤立的花冠破裂在成年人是稀罕的并且 Hoffa 骨折不属于工会被报导仅仅在文学的一些时间。我们分析了六个案例在三年的一个时期上的 Hoffa 破裂不属于工会。三个病人保存地被对待,三个病人有固定失败。表示的延期是到一年的 2 个月。治疗协议与膝 arthrolysis 一起由开的减小, pseudoarthrosis 的切除,骨头 grafting 和内部固定组成了。联合在平均数 16 星期在所有病人被完成。治疗 Hoffa 破裂不属于工会要求小心的外科手术前的计划和过细的外科的技术。关于在破裂管理和外科的技术的争吵的文学被考察。Ajay Pal Singh Ish Kumar Dhammi Raju Vaishya Anil Kumar Jain Arun Pal Singh Prashant Modi 2011Chinese Journal of Traumatology2011,14,3:11
4Analysis of isoquinoline alkaloids from Mahonia leschenaultia and Mahonia napaulensis roots using UHPLC-Orbitrap-MSn and UHPLC-QqQ LIT-MS/MS显示文摘Mahonia leschenaultia(ML) and Mahonia napaulensis(MN) are less known and unexplored medicinal plants of the family Berberidaceae. They are used by the Todas of Nilgiris in their religious and medical practices but chemically less identified. Hence, we decided to do extensive phytochemical analysis to explore the potential of these plant extracts. An ultrahigh performance electrospray tandem mass spectrometry(UHPLC–ESI–MS/MS)method was successfully developed for qualitative analysis of the bioactive components in Mahonia species using Orbitrap Velos Pro mass spectrometer. Sixteen compounds were identified by comparison of their retention times and mass spectra(MS) with authentic standards and reported literature. Multi-stage mass spectra(MS^(2–8)) for the identification of protoberberine and aporphine alkaloids showed the sequential expulsion of all the substituents attached with their basic skeleton followed by CO loss. Eight of the identified compounds(berberine, jatrorrhizine, palmatine, magnoflorine, isocorydine, glaucine, tetrahydropalmatine and tetrahydroberberine) were simultaneously determined by another UHPLC–ESI–MS/MS method under the multiple reactions monitoring(MRM) mode quantitatively using triple quadrupole linear ion trap mass spectrometer. The analytical method was validated for 8 bioactive compounds with overall recovery in the range98.5%–103.6%(RSD≤2.2%), precise(RSD≤2.07%) and linear(r≥0.9995) over the concentration range of 0.5–1000 ng/mL and successfully applied in ML and MN roots, which suggests the suitability of the proposed approach for the routine analysis of Mahonia species and their quality control.Awantika Singh Vikas Bajpai Sunil Kumar Ajay Kumar Singh Rawat Brijesh Kumar 2017Journal of Pharmaceutical Analysis2017,7,2:9
5Applying real time seismic monitoring technology for slope stability assessment—An Indian opencast coal mine perspective显示文摘This paper outlines the results obtained from real time microseismic monitoring of an opencast coal mine in South India.The objective of the study is to investigate the stress changes within the rockmass along the slope due to underground mine development operation and their impact on the stability of the highwall slope.The installed microseismic systems recorded the seismic triggerings down toà2 moment magnitude.In general,most of the events recorded during the monitoring period are weak in seismic energy.The study adopts a simple and more reliable tool to characterize the seismically active zone for assessing the stability of the highwall in real time.The impact of underground working on the slope is studied on the basis of the seismic event impact contours and seismic clusters.During the monitoring period,it is observed that the intensity of the overall microseismic activity along the slope due to the mine development operations did not cause any adverse impact on the highwall stability.Vinoth S. Ajay Kumar L. 2014International Journal of Mining Science and Technology2014,24,1:9
6Enhanced oil recovery by nonionic surfactants considering micellization, surface, and foaming properties显示文摘Surfactants for enhanced oil recovery are important to study due to their special characteristics like foam generation,lowering interfacial tension between oleic and aqueous phases,and wettability alteration of reservoir rock surfaces.Foam is a good mobility control agent in enhanced oil recovery for improving the mobility ratio.In the present work,the foaming behavior of three nonionic ethoxylated surfactants,namely Tergitol 15-S-7,Tergitol 15-S-9,and Tergitol 15-S-12,was studied experimentally.Among the surfactants,Tergitol 15-S-12 shows the highest foamability.The effect of Na Cl concentration and synthetic seawater on foaming behavior of the surfactants was investigated by the test-tube shaking method.The critical micelle concentrations of aqueous solutions of the different nonionic surfactants were measured at 300 K.It was found that the critical micelle concentrations of all surfactants also increased with increasing ethylene oxide number.Dynamic light scattering experiments were performed to investigate the micelle sizes of the surfactants at their respective critical micelle concentrations.Core flooding experiments were carried out in sand packs using the surfactant solutions.It was found tha t22% additional oil was recovered in the case of all the surfactants over secondary water flooding.Tergitol 15-S-12exhibited the maximum additional oil recovery which is more than 26%after water injection.Achinta Bera Ajay Mandal Hadi Belhaj Tarkeswar Kumar 2017Petroleum Science2017,14,2:8
7Per oral cholangiopancreatoscopy in pancreatico biliary diseases- Expert consensus statements显示文摘AIM: To provide consensus statements on the use of per-oral cholangiopancreatoscopy(POCPS).METHODS: A workgroup of experts in endoscopic retrograde cholangiopancreatography(ERCP), endosonography, and POCPS generated consensus statements summarizing the utility of POCPS in pancreaticobiliary disease. Recommendation grades used validated evidence ratings of publications from an extensive literature review.RESULTS: Six consensus statements were generated:(1) POCPS is now an important additional tool during ERCP;(2) in patients with indeterminate biliary strictures, POCS and POCS-guided targeted biopsy are useful for establishing a definitive diagnosis;(3) POCS and POCS-guided lithotripsy are recommended for treatment of difficult common bile duct stones when standard techniques fail;(4) in patients with main duct intraductal papillary mucinous neoplasms(IPMN) POPS may be used to assess extent of tumor to assist surgicalresection;(5) in difficult pancreatic ductal stones,POPS-guided lithotripsy may be useful in fragmentation and extraction of stones; and(6) additional indications for POCPS include selective guidewire placement,unexplained hemobilia, assessing intraductal biliary ablation therapy, and extracting migrated stents. CONCLUSION: POCPS is important in association with ERCP, particularly for diagnosis of indeterminate biliary strictures and for intra-ductal lithotripsy when other techniques failed, and may be useful for preoperative assessment of extent of main duct IPMN, for extraction of difficult pancreatic stones, and for unusua indications involving selective guidewire placement,assessing unexplained hemobilia or intraductal biliary ablation therapy, and extracting migrated stents.Mohan Ramchandani Duvvur Nageshwar Reddy Sundeep Lakhtakia Manu Tandan Amit Maydeo Thoguluva Seshadri Chandrashekhar Ajay Kumar Randhir Sud Rungsun Rerknimitr Dadang Makmun Christopher Khor 2015World Journal of Gastroenterology2015,21,15:8
8Outcome of surgical treatment of type IV capitellum frac- tures in adults显示文摘Ajay Pal Singh Ish Kumar Dhammi Vipul Garg Arun Pal Singh 2012Chinese Journal of Traumatology2012,15,4:7
9Analysis on Critical Success Factors for Agile Manufacturing Evaluation in Original Equipment Manufacturing Industry-An AHP Approach显示文摘Manufacturing industries are facing challenges in the implementation of agile manufacturing in their products and processes.Agility is widely accepted as a new competitive concept in the manufacturing sector in fulfilling varying customer demand. Thus,evaluation of agile manufacturing in industries has become a necessity. The success of an organisation depends on its ability to manage finding the critical success factors and give them special and continued attention in order to bring about high performance. This paper proposes a set of critical success factors(CSFs) for evaluating agile manufacturing considered appropriate for the manufacturing sector.The analytical hierarchy process(AHP) method is applied for prioritizing the success factors, by summarizing the opinions of experts. It is believed that the proposed CSFs enable and assist manufacturing industries to achieve a higher performance in agile manufacturing so as to increase competitiveness.C Ajay Guru Dev V S Senthil Kumar 2016Chinese Journal of Mechanical Engineering2016,29,5:7
10Anthrax: A disease of biowarfare and public health importance显示文摘Bioterrorism has received a lot of attention in the first decade of this century. Biological agents are considered attractive weapons for bioterrorism as these are easy to obtain, comparatively inexpensive to produce and exhibit widespread fear and panic than the actual potential of physical damage. Bacillus anthracis(B. anthracis), the etiologic agent of anthrax is a Gram positive, spore forming, non-motile bacterium. This is supposed to be one of the most potent BW agents because its spores are extremely resistant to natural conditions and can survive for several decades in the environment. B.anthracis spores enter the body through skin lesion(cutaneous anthrax), lungs(pulmonary anthrax), or gastrointestinal route(gastrointestinal anthrax) and germinate, giving rise to the vegetative form. Anthrax is a concern of public health also in many countries where agriculture is the main source of income including India. Anthrax has been associated with human history for a very long time and regained its popularity after Sept 2001 incidence in United States. The present review article describes the history, biology, life cycle, pathogenicity, virulence, epidemiology and potential of B. anthracis as biological weapon.Ajay Kumar Goel 2015World Journal of Clinical Cases2015,3,1:6
11Management issues in post living donor liver transplant biliary strictures显示文摘Biliary complications are common after living donor liver transplant(LDLT) although with advancements in surgical understanding and techniques, the incidence is decreasing. Biliary strictures are more common than leaks. Endoscopic retrograde cholangiopancreatography(ERCP) is the first line modality of treatment of post LDLT biliary strictures with a technical success rate of 75%-80%. Most of ERCP failures are successfully treated by percutaneous transhepatic biliary drainage(PTBD) and rendezvous technique. A minority of patients may require surgical correction. ERCP for these strictures is technically more challenging than routine as well post deceased donor strictures. Biliary strictures may increase the morbidity of a liver transplant recipient, but the mortality is similar to those with or without strictures. Post transplant strictures are short segment and soft, requiring only a few session of ERCP before complete dilatation. Long-term outcome of patients with biliary stricture is similar to those without stricture. With the introduction of new generation cholangioscopes, ERCP success rate may increase, obviating the need for PTBD and surgery in these patients.Manav Wadhawan Ajay Kumar 2016World Journal of Hepatology2016,8,10:5
12Nanostructured porous polyaniline(PANI)coated carbon cloth(CC)as electrodes for flexible supercapacitor device显示文摘Nanostructured porous polyaniline(PANI)has been synthesized and coated simultaneously on a highly flexible and conductive carbon cloth(CC)substrate using a simple in-situ chemical oxidative polymerization technique.PANI coated CC(PANI-CC)based flexible electrodes were further used for the fabrication of flexible supercapacitor devices.For the comparison purpose,pure PANI has also been synthesized and tested for its electrochemical performance.The energy storage capacity of PANI and PANI–CC composite was investigated using electrochemical techniques like CV,GCD,and EIS in a potential range from 0 to 0.8 V in 1 M H_(2)SO_(4)electrolyte.PANI-CC flexible electrodes exhibited the highest specific capacitance of 691 F/g;whereas,pure PANI could only achieve 575 F/g of specific capacitance at 1 A/g.Composite also exhibited outstanding cyclic stability by recollecting 94%of its initial capacitance after 2000 GCD cycles.For actual implementation,a flexible supercapacitor device has been fabricated using stainless steel sheets and PANI-CC flexile electrodes.The energy storage performance of the PANI-CC flexible supercapacitor device was tested at several bending angles,which resulted in 72%of capacitance retention at a maximum bending angle of 140°compared to the capacitance obtained at an angle 0°(flat state).PANI-CC exhibited improved electrochemical performance than pure PANI due to the synergistic effect between PANI and CC.Here,CC helped in enhancing the conductivity and stability;whereas,PANI boosted the capacitance owing to its excellent porosity and fast pseudocapacitive charge storage response.Dinesh J.Ahirrao Ajay Kumar Pal Vikalp Singh Neetu Jha 2021Journal of Materials Science & Technology2021,,29:5
13Neglected isolated fracture of the trochlea humeri显示文摘Ajay Pal Singh Ish Kumar Dhammi Anil Kumar Jain Saurabh Jain 2010Chinese Journal of Traumatology2010,13,4:4
14Pseudomonas fluorescens-like bacteria from the stomach:A microbiological and molecular study显示文摘AIM:To characterize oxidase-and urease-producing bacterial isolates,grown aerobically,that originated from antral biopsies of patients suffering from acid peptic diseases.METHODS:A total of 258 antral biopsy specimens were subjected to isolation of bacteria followed by tests for oxidase and urease production,acid tolerance and aerobic growth.The selected isolates were further characterized by molecular techniques viz.amplifications for 16S rRNA using universal eubacterial and HSP60 gene specific primers.The amplicons were subjected to restriction analysis and partial sequencing.A phylogenetic tree was generated using unweighted pair group method with arithmetic mean(UPGMA) from evolutionary distance computed with bootstrap test of phylogeny.Assessment of acidity tolerance of bacteria isolated from antrum was performed using hydrochloric acid from 10-7 mol/L to 10-1 mol/L.RESULTS:Of the 258 antral biopsy specimens collected from patients,179(69.4%) were positive for urease production by rapid urease test and 31%(80/258) yielded typical Helicobacter pylori(H.pylori) after 5-7 d of incubation under a microaerophilic environment.A total of 240(93%) antral biopsies yielded homogeneous semi-translucent and small colonies after overnight incubation.The partial 16S rRNA sequences revealed that the isolates had 99% similarity with Pseudomonas species.A phylogenetic tree on the basis of 16S rRNA sequences denoted that JQ927226 and JQ927227 were likely to be related to Pseudomonas fluorescens(P.fluorescens).On the basis ofHSP60 sequences applied to the UPGMA phylogenetic tree,it was observed that isolated strains in an aerobic environment were likely to be P.fluorescens,and HSP60 sequences had more discriminatory potential rather than 16S rRNA sequences.Interestingly,this bacterium was acid tolerant for hours at low pH.Further,a total of 250(96.9%) genomic DNA samples of 258 biopsy specimens and DNA from 240 bacterial isolates were positive for the 613 bp amplicons by targeting P.fluorescens-specific conserved putative outer membrane protein gene sequences.CONCLUSION:This study indicates that bacterial isolates from antral biopsies grown aerobically were P.fluorescens,and thus acid-tolerant bacteria other than H.pylori can also colonize the stomach and may be implicated in pathogenesis/protection.Saurabh Kumar Patel Chandra Bhan Pratap Ajay Kumar Verma Ashok Kumar Jain Vinod Kumar Dixit Gopal Nath 2013World Journal of Gastroenterology2013,19,7:4
15Ebola virus disease: past, present and future显示文摘Ebola virus disease is one of the most deadly ailments known to mankind due to its high mortality rate(up to 90%) accompanying with the disease. Ebola haemorrhagic fever(EHF) is an infectious disease of animal that can be transmitted to both human and non-human primates. The first epidemic of EHF occurred in 1976 in the Democratic Republic of the Congo. The incubation period of ebola is less than 21 days. Ebola virus infections are depicted by immune suppression and a systemic inflammatory response that leads to damage of the vascular, coagulation and immune systems, causing multi-organ failure and shock. Five genetically distinct members of the Filoviridae family responsible for EHF are as follows: Zaire ebolavirus, Sudan ebolavirus, C?te d'Ivoire ebolavirus, Bundibugyo ebolavirus and Reston ebolavirus. The ongoing 2014 West Africa ebola epidemic has been considered as the most serious panic in the medical field with respect to both the number of human cases and death toll. The natural host for ebola virus is unknown, thus it is not possible to carry out programs to regulate or abolish virus from transmission to people. The ebola virus infection provides little chance to develop acquired immunity causing rapid progression of the disease. It is pertinent to mention that at present, there is no antiviral therapy or vaccine that is helpful against ebola virus infection in humans. The impediment of EHF necessitates much better understanding of the epidemiology of the disease, particularly the role of wildlife, as well as bats, in the spread of ebola virus to humans.Harish Rajak Deepak Kumar Jain Avineesh Singh Ajay Kumar Sharma Anshuman Dixit 2015Asian Pacific Journal of Tropical Biomedicine2015,5,5:4
16Critical role of OX40 signaling in the TCR-independent phase of human and murine thymic Treg generation显示文摘Regulatory T cells(Tregs)play a pivotal role in immune-tolerance,and loss of Treg function can lead to the development of autoimmunity.Natural Tregs generated in the thymus substantially contribute to the Treg pool in the periphery,where they suppress self-reactive effector T cells(Teff)responses.Recently,we showed that OX40L(TNFSF4)is able to drive selective proliferation of peripheral Tregs independent of canonical antigen presentation(CAP-independent)in the presence of low-dose IL-2.Therefore,we hypothesized that OX40 signaling might be integral to the TCR-independent phase of murine and human thymic Treg(tTreg)development.Development of tTregs is a two-step process:Strong T-cell receptor(TCR)signals in combination with co-signals from the TNFRSF members facilitate tTreg precursor selection,followed by a TCR-independent phase of tTreg development in which their maturation is driven by IL-2.Therefore,we investigated whether OX40 signaling could also play a critical role in the TCR-independent phase of tTreg development.OX40−/−mice had significantly reduced numbers of CD25−Foxp3low tTreg precursors and CD25+Foxp3+mature tTregs,while OX40L treatment of WT mice induced significant proliferation of these cell subsets.Relative to tTeff cells,OX40 was expressed at higher levels in both murine and human tTreg precursors and mature tTregs.In ex vivo cultures,OX40L increased tTreg maturation and induced CAP-independent proliferation of both murine and human tTregs,which was mediated through the activation of AKT-mTOR signaling.These novel findings show an evolutionarily conserved role for OX40 signaling in tTreg development and proliferation,and might enable the development of novel strategies to increase Tregs and suppress autoimmunity.Prabhakaran Kumar Alejandra Marinelarena Divya Raghunathan Vandhana K Ragothaman Shikha Saini Palash Bhattacharya Jilao Fan Alan L Epstein Ajay V Maker Bellur S Prabhakar 2019Cellular & Molecular Immunology2019,16,2:4
17Monteggia fracture dislocation equivalents analysis of eighteen cases treated by open reduction and internal fixation显示文摘Ajay Pal Singh Ish Kumar Dhammi Anil Kumar Jain Rajeev Raman Prashant Modi 2011Chinese Journal of Traumatology2011,14,4:4
18含笑属植物所含化学成分与其生物活性的综述(英文)显示文摘属木兰科的含笑属植物大约有80多个种类,它们大都分布在南亚国家。这些植物被当地人用于治疗各种疾病,如发烧、绞痛、麻风病、眼疾、炎症以及解蝎子毒。从9种含笑属植物中分离出94种化合物,例如倍半萜烯、类固醇、黄酮类、阿扑啡类、苯酚、酯类、生物碱和苯环型化合物等,它们具有抗菌、抗癌以及抗疟原虫活性。本文详细地论述了含笑属植物所含化学成分的生物及化学性能。Dinesh Kumar Sunil Kumar Seema Taprial Deepak Kashyap Ajay Kumar Om Prakash 2012中西医结合学报2012,10,12:4
19Palliative surgical bypass for unresectable periampullary carcinoma显示文摘BACKGROUND:Around 60%to 80%of patients with periampullary carcinoma are unresectable either due to distant metastasis or local vascular invasion.With the advancement of endoscopic interventional procedures,the role of surgical bypass has diminished.However,surgical bypass is still appropriate in patients with unresectable disease discovered at the time of surgery.This study was conducted to assess the results of palliative surgical bypass for patients with unresectable periampullary carcinoma at our hospital,a tertiary referral center of Northern India. METHOD:The study group comprised 204 patients who had undergone surgical bypass for advanced periampullary carcinoma over the last 15 years. RESULTS:Between January 1990 and December 2004,204 patients(128 males,76 females)consisting of 179 patients with carcinoma of head of the pancreas,14 patients with ampullary carcinoma,8 patients with lower end cholangiocarcinoma and 3 patients with duodenal carcinoma underwent surgical bypass.Their average age was 51 years (range 20-78 years).Both biliary and gastric bypasses were done in 158(77.45%),biliary bypass alone in 37(18.13%) and gastric bypass alone in 9(4.32%).Biliary bypass was done by Roux-en-Y hepaticojejunostomy,and gastric bypass by retrocolic gastrojejunostomy.The overall postoperative mortality and morbidity were 0.98%and 26.9%,respectively The patients who died had undergone previously endoscopic intervention.Complications included wound infection in 12.25%of the patients,bile leak in 5.12%,delayed gastric emptying in 5.38%,ascitic leak from drains in 8.8%,and upper gastrointestinal bleeding in 1.96%.The incidences of wound infection and bile leak both were significantly higher in patients who had had preoperative biliary stenting None of the patients who had undergone Roux-en-Y hepati cojejunostomy+retrocolic gastrojejunostomy required any intervention later in their life.CONCLUSIONS:Surgical bypass is a safe procedure with negligible mortality and minimal morbidity.It has not lost its relevance and is an appropriate treatment in patients deemed unresectable on peroperative assessment.Shivendra Singh Ajay Kumar Sachdev Adarsh Chaudhary Anil Kumar Agarwal 2008Hepatobiliary & Pancreatic Diseases International2008,7,3:3
20Physicochemical properties and morphology of biochars as affected by feedstock sources and pyrolysis temperatures显示文摘Feedstock sources and pyrolysis temperatures affect the physicochemical and morphological properties of biochars.We evaluated biochars derived from switchgrass(SGB)and poultry litter(PLB)pyrolyzed at 350℃(SGB350,PLB350)and 700℃(SGB700,PLB700)to identify their potential ability in improving soil health.Except for SGB350,the pH of biochars was high(>10.0)and can be used as an amendment in acid soils.PLB700 had higher mineral content and nutrient availability due to its higher ash content(tenfold higher)and electrical conductivity.Surface functional groups responsible for metal retention were evidenced in all biochars.Cation exchange capacity(CEC),specific surface area(SSA),and microporosity more than doubled by increasing pyrolysis temperature from 350 to 700℃.The pH-buffering capacity measured through acid titration curve was better than that calculated with acid/alkali additions.Biochars pyrolyzed at 700℃ have much higher pH,CEC,SSA,and stronger buffering capacity,and thus are more promising to improve soil health and reduce contaminant bioavailability.Joao Arthur Antonangelo Hailin Zhang Xiao Sun Ajay Kumar 2019Biochar2019,1,3:3
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