|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effects of polydispersity on the micro–macro behavior of granular assemblies under different deformation paths显示文摘The micromechanical and macromechanical behavior of idealized granular assemblies, made by linearly elastic, frictionless, polydisperse spheres, are studied in a periodic, triaxial box geometry, using the discrete element method. Emphasis is put on the effect of polydispersity under purely isotropic loading and unloading, deviatoric(volume conserving), and uniaxial compression paths.We show that scaled pressure, coordination number and fraction of rattlers behave in a very similar fashion as functions of volume fraction, irrespective of the deformation path applied. Interestingly, they show a systematic dependence on the deformation mode and polydispersity via the respective jamming volume fraction. This confirms that the concept of a single jamming point has to be rephrased to a range of variable jamming points, dependent on microstructure and history of the sample, making the jamming volume fraction a state-variable.This behavior is confirmed when a simplified constitutive model involving structural anisotropy is calibrated using the purely isotropic and deviatoric simulations. The basic model parameters are found to depend on the polydispersity of the sample through the different jamming volume fractions. The predictive power of the calibrated model is checked by comparison with an independent test, namely uniaxial compression. The important features of the uniaxial experiment are captured and a qualitative prediction for the evolution of stress and fabric is shown involving a 'softening' regime in both stress and fabric – stronger for the latter – that was not prescribed into the model a priori. | Nishant Kumar Olukayode I.Imole Vanessa Magnanimo Stefan Luding | 2014 | Particuology2014，12，1： | 5 |
| 2 | A systematic investigation of secondary phase dissolution in Mg-Sn alloys显示文摘As-cast Mg-Sn alloys(3,6,and 9 wt%Sn)were solution treated at 653,703 and 753 K(380,430 and 480℃)for 1,4,8,12 and 24 h to determine the variation of secondary phase with respect to Sn content,temperature and time.Mg-3 wt%Sn exhibits Mg2Sn dissolution at all solution treatment temperatures whereas Mg-6 and 9 wt%Sn alloy displays Mg2Sn reprecipitation and dissolution depending on the heat treatment temperature.In addition,a combined mathematical model that predicts the secondary phase dissolution and solute redistribution as a function of temperature and time is presented in this work.This model is a significant improvement compared to the previous studies where the dissolution and homogenization processes are considered independently.The effect of grain size and solute mobility upon the dissolution and homogenization kinetics is discussed as well. | Arushi Dev Niladri Naskar Nishant Kumar Ashutosh Jena Manas Paliwal | 2019 | Journal of Magnesium and Alloys2019，7，4： | 5 |
| 3 | Triple tube drainage for “difficult” gastroduodenal perforations:A prospective study显示文摘AIM To prospectively study the outcome of difficult gastroduodenal perforations(GDPs) treated by triple tube drainage(TTD) in order to standardize the procedure.METHODS Patients presenting to a single surgical unit of a tertiary hospital with difficult GDPs(large, unfavourable local and systemic factors) were treated with TTD(gastrostomy, duodenostomy and feeding jejunostomy). Postoperative parameters were observed like time to return of bowel sounds, time to start enteral feeds, time to start oral feeds, daily output of all drains, time to clamping/removal of all drains, time for skin to heal, complications, hospital stay, and, mortality. Descriptive statistics were used. RESULTS Between December 2013 and April 2015, 20 patients undergoing TTD for GDP were included, with mean age of 44.6 ± 19.8 years and male:female ratio of 17:3. Mean pre-operative APACHE Ⅱ scores were 10.85 ± 3.55; most GDPs were prepyloric(9/20; 45%) or proximal duodenal(8/20; 40%) and mean size was 1.83 ± 0.59 cm(largest 2.5 cm). Median times of resumption of enteral feeding, removal of gastrostomy, removal of duodenostomy,removal of feeding jejunostomy and oral feeding were 4 d(4-5 IQR), 13(12-16.5 IQR), 16(16.25-22.25 IQR), 18(16.5-24 IQR) and 12 d(10.75-18.5 IQR) respectively. Median hospital stay was 22 d(19-26 IQR) while mortality was 4/20(20%). CONCLUSION TTD for difficult GDP is feasible, easy in the emergency, and patients recover in two-three weeks. It obviates the need for technically demanding and riskier procedures. | Nitin Agarwal Nishant Kumar Malviya Nikhil Gupta Iqbal Singh Sanjay Gupta | 2017 | World Journal of Gastrointestinal Surgery2017，9，1： | 1 |
| 4 | Impact of Bloom Filter on Infection Rate in Epidemic Forwarding for ICNs 显示文摘 | Shailendra Shukla Nishant Kumar Rajiv Misra | 2014 | Wireless Per- sonal Communications2014，75，4： | 1 |
| 5 | Lack of association of brucellosis resistance with (GT) 13 microsatellite allele at 3′UTR of NRAMP1 gene in Indian zebu ( Bos indicus ) and crossbred ( Bos indicus × Bos taurus ) cattle显示文摘 | Nishant Kumar Abhijit Mitra Indrajit Ganguly Rajendra Singh Sitangsu M. Deb Suresh K. Srivastava Arjava Sharma | 2005 | Veterinary Microbiology2005，，： | 1 |
| 6 | Assessment of long-term climate variability and its impact on the decadal growth of horticultural crops in central India显示文摘Background:The impact of climate change on horticultural production is of utmost concern worldwide.One such vulnerable region of horticultural importance is the Madhya Pradesh state in the central part of India.It is crucial to analyse the long-term trend in climatic variations and its effect on horticultural crop production.Therefore,this study focuses on detecting trends in mean annual precipitation and temperature of 115 years for the 15 districts covering all the regions of the state as well as projections of all the Representative Concentration Pathway(RCP)climatic scenarios for 2050 and 2080 of Madhya Pradesh state.The decadal(2010–2020)insight into the area and production of horticultural crops is undertaken which will help forecasting the future growth trend.For a better insight,case study on four horticultural crops is undertaken to assess their decadal growth trend vis-à-vis climate parameters in these 15 districts.Results:The Mann–Kendall test for 1901–2016 and Sen’s slope indicated a non-significant change in long-term trend for precipitation except for increasing change in Khargone and decreasing change in Rewa districts.Signifi-cant increasing trend of average temperature is obtained for Hoshangabad,Jabalpur,Sagar and Rewa districts.The Sen’s slope indicated an increase of 0.005 to 0.009℃for maximum temperature and 0.005 to 0.012℃for minimum temperature annually.The projections of all the RCP climate scenarios for the years 2050 and 2080 indicated non-significant variation in precipitation but an increase in maximum(1.4 to 4.1℃)and minimum(1.45 to 4.65℃)annual temperatures.An increasing trend in area and production for horticultural crops is also observed in central India for the study period.There is yield increase in all the crops selected in case study except for potato,which recorded a decreased yield between the years 2010–2015.Conclusion:The Mann–Kendall test and projections indicate towards climate change with a temperature rise.Though the decadal study indicates an increasing trend in horticultural crops,the districts identified to be affected by climate change need to have a plan to lessen the horticultural loss in the state.This study contributes to understand-ing the future climate change trends and its impact on horticultural crop production to formulate various adaptation strategies. | Gaurav Sharma Amita Sharma Nishant Kumar Sinha Om Prakash Sharma Ashutosh Singh Ajai Kumar Pandey Abhishek Kumar Sudhir Kumar Trivedi Bharti Sao Mukesh Kumar Sahu | 2022 | Ecological Processes2022，11，1： | 0 |
| 7 | Axenfeld-Reiger syndrome: A search for the missing links显示文摘BACKGROUND Axenfeld-Rieger syndrome(ARS)is a rare cause of congenital glaucoma and may result in loss of vision.ARS is mostly autosomal dominant in nature characterized by developmental abnormalities in the angle of anterior chamber and iris of the eye,also associated with structural abnormalities in the body.AIM To study and observe the demographics and clinical findings in a very rare ocular disease known as ARS.METHODS Case records of symptomatic patients attending Ophthalmology outpatient department and diagnosed to have ocular hypertension or glaucoma in 3 years from March 2017 to March 2020 were evaluated to search for cases diagnosed with ARS.Records of all patients diagnosed with ARS were then analysed for demographic and clinical characterization as well as management and success of therapy.RESULTS Eight out of ten patients with positive clinical signs were symptomatic and had glaucoma.One of these patients had limbal stem cell deficiency and another had vernal keratoconjunctivitis.CONCLUSION Clinical characterization of ARS is important for making a definitive diagnosis and determining prognosis. | Arvind Kumar Morya Prasanna Venkatesh Ramesh Sony Sinha Prateek Nishant Nazia Nain Ravi NaikRamavath Chetana Gone Ripunjay Prasad | 2023 | World Journal of Clinical Cases2023，11，29： | 0 |
| 8 | Biotransformation,multifunctional recycling mechanism of nanostructures,and evaluation of the safety of nanoscale materials显示文摘Current evidence of concept analyses recommending nanotechnology for biomedical uses abounds in recent research. The area of biotechnology interfaces with nanostructures, reconfigures their composition, and alters their characteristics;which influences the dispersion of the particles, the biotransformation they cause, and their potential toxic effect. It is vital to link the idea of the lifecycle of nanostructures to the biological impacts and use methodologies to identify, estimate, and track the gradual bioprocessing of nanostructures in vivo, from a body-wide level to a nanoscopic size. This is necessary because understanding how nanostructures processing, degradation, persistence, and recycling predict potential exposure risks. The safe implementation of nanotechnology-based products in biomedical applications necessitates an extensive understanding of the recycling and transformations of nanomaterials in a living organism. Long-term fate in the body is crucial, as it governs potential environmental risks to human health. Strategies may be used to manage the long-term outcome of nanostructures in an organism since, in addition to composition, their design also affects how long they last and how easily they degrade. The lifespan of nanoparticles, a flexible and biocompatible category of nanostructures that have made it into clinical trials, is the subject of this article. Strategies may be used to manage the long-term outcome of nanoparticles in an organism since, in addition to composition, their design also affects how long they last and how easily they degrade. This review explained the safety of nanoscale materials, biotransformation, and the multifunctional recycling mechanism of nanostructures. | Debjyoti Talukdar Parveen Kumar Benu Chaudhary Deepak Sharma Nishant Yadav Obaid Afzal Abdulmalik Saleh Alfawaz Altamimi Waleed Hassan Almalki Sami IAlzarea Imran Kazmi Ashutosh Pareek Gaurav Gupta Madan Mohan Gupta | 2023 | Particuology2023，，11： | 0 |
| 9 | 逆境之下 对冲基金降费求生显示文摘●近年来表现平淡的对冲基金行业在尝试下调费率吸引投资者牛津大学(University of Oxford)教授卢多维克·法表示在冠状病毒疫情席卷全球市场之前,对冲基金费率便已呈现缩水势头。现在,费率的下降已无可逆转。规模达3万亿美元的对冲基金行业多年来一直顶着收费高昂的恶名,对冲基金所运作的投资组合一般仅向机构和富有的个人开放。 | Nishant Kumar Hema Parmar Demetrios Pogkas 牛小婧(译) | 2020 | 商业周刊(中文版)2020，，13： | 0 |
| 10 | Clinical characteristics of COVID-19 patients who underwent tracheostomy and its effect on outcome:A retrospective observational study显示文摘BACKGROUND The exponential rise in Coronavirus disease 2019(COVID-19)cases has resulted in an increased number of patients requiring prolonged ventilatory support and subsequent tracheostomy.With the limited availability of literature regarding the outcomes of COVID-19 patients with tracheostomy,we attempted to study the clinical characteristics and multiple parameters affecting the outcomes in these patients.AIM To determine all-cause mortality following tracheostomy and its association with various risk factors in COVID-19 patients.METHODS This retrospective study included 73 adult COVID-19 patients admitted to the ICU between 1 April,2020 and 30 September,2021 who underwent tracheostomy as a result of acute respiratory failure due to COVID-19.The data collected included demographics(age,sex),comorbidities,type of oxygen support at admission,severity of COVID-19,complications,and other parameters such as admission to tracheostomy,intubation to tracheostomy,ICU stay,hospital stay,and outcome.RESULTS This study included 73 adult patients with an average age of 52±16.67 years,of which 52%were men.The average time for admission to tracheostomy was 18.12±12.98 days while intubation to tracheostomy was 11.97±9 days.The mortality rate was 71.2%and 28.8%of patients were discharged alive.The mean duration of ICU and hospital stay was 25±11 days and 28.21±11.60 days,respectively.Greater age,severe COVID-19,mechanical ventilation,shock and acute kidney injury were associated with poor prognosis;however,early tracheostomy in intubated patients resulted in better outcomes.CONCLUSION Patients with severe COVID-19 requiring mechanical ventilation have a poor prognosis but patients with early tracheostomy may benefit with no added risk.We recommend that the timing of tracheostomy be decided on a case-by-case basis and a well-designed randomised controlled trial should be performed to elucidate the potential benefit of early tracheostomy in such patients. | Yudhyavir Singh Kapil Dev Soni Abhishek Singh Nikita Choudhary Fahina Perveen Richa Aggarwal Nishant Patel Shailendra Kumar Anjan Trikha | 2022 | World Journal of Virology2022，11，6： | 0 |
| 11 | Advances in post intensive care unit care: A narrative review显示文摘As the treatment options,modalities and technology has grown,mortality in intensive care unit(ICU)has been on the decline.More and more patients are being discharged to wards and in the care of their loved ones after at times prolonged treatment,sometimes in isolation.These survivors have a lower life expectancy and a poorer quality of life.They can have substantial familial financial implications and an economic impact on the healthcare system in terms of increased and continued utilisation of services,the so-called post intensive care syndrome(PICS).But it is not only the patient who is the sufferer.The mental health of the loved ones and family members may also be affected,which is termed as PICS-family.In this review,we shall be reviewing the definition,epidemiology,clinical features,diagnosis and evaluation,treatment and follow up of PICS.We shall also focus on measures to prevent,rehabilitate and understand the ICU stay from patients’perspective on how to redesign the ICU,post ICU care needs for a better patient outcome. | Nishant Kumar | 2023 | World Journal of Critical Care Medicine2023，12，5： | 0 |
| 12 | A Prospective Study to Compare Routine versus Need Based Change of IV Cannula on Development of Infusion Phlebitis in Adult Surgical Patients显示文摘 | Divyanti Mishra Kumar Nishant | 2017 | Journal of Health Science2017，5，5： | 0 |
| 13 | 多空对冲基金之困显示文摘即使在高压、高薪的对冲基金行业,“多空”(long-short)选股经理人也被认为是一个特殊的存在。艾尔弗雷德·温斯洛·琼斯(Alfred Winslow Jones)在七十年前创立的这种投资风格让对冲基金声名鹊起。对冲基金押注他们看好的股票上涨(华尔街业内称之为“做多”),同时押注其他一些股票下跌(“卖空”),并使用杠杆来放大收益。 | Nishant Kumar 王非(译) | 2022 | 商业周刊(中文版)2022，，18： | 0 |
| 14 | 英国金融科技企业投身“监管沙箱”计划显示文摘虽然脱欧可能损害伦敦作为欧洲银行和交易中心的声望,但英国金融科技业的上级监管机构却意外地成为了赢家。 | Nishant Kumar Taylor Hall 微微 | 2017 | 商业周刊(中文版)2017，0，1： | 0 |
| 15 | Nutrition interventions and clinical outcomes of pregnant women with gestational diabetes mellitus: More than meets the eye显示文摘In the retrospective study by Luo et al regarding clinical outcomes in gestational diabetes mellitus(GDM),the results are statistically significant in favour of the benefits of individualized nutrition interventions enumerated therein.The study has provided important evidence to improve maternal and child health in the Asian population.The methods,however,appear to have considerable limi-tations,wherein the time point of diagnosis of GDM,severity of GDM,selection bias,compliance to therapy,important maternal covariates,observable microvascular abnormalities and the confounding effect of added insulin have not been considered.We have provided suggestions to improve the external validity of the study,including the use of Equator Network reporting guidelines and inclusion of overweight and obese patients in future studies. | Sony Sinha Prateek Nishant Ranjeet Kumar Sinha Arvind Kumar Morya Ripunjay Prasad | 2024 | World Journal of Diabetes2024，15，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员