Bandedge Emission in Sprayed ZnO Thin Films

Vikas Thakur,Udai Pratap Verma,Rajaram Poolla 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6

ZnO thin films were grown by spraying aqueous solutions of zinc acetate on quartz and silicon substrates heated to 500°C. X-ray diffraction (XRD) studies show that the ZnO films crystallize in the hexagonal phase and are highly oriented along the [002] direction. SEM micrographs show that the surface of the films is uniformly covered with worm shaped particles. EDAX results together with XRD studies confirm that the synthesized films are single phase ZnO with good stoichiometry. The sharp absorption occurring near the band edge indicates high quality growth of the material. Room temperature photoluminescence (PL) studies of the sprayed films show a strong near band edge (NBE) emission. PL spectra obtained at low temperature (20 K) exhibit better resolved peaks of the NBE emission caused by the radiative recombination of free and bound excitons. The dominant free exciton emission observed in the PL spectra confirms the high quality of the sprayed ZnO layers.

Performance Evaluation of AODV Using Fuzzy Logic to Reduce Congestion in MANET

Vikas Thakur,Laxmi Shrivastava,Sarita S.Bhadauria 사단법인 인문사회과학기술융합학회 2015 예술인문사회융합멀티미디어논문지 Vol.5 No.5

Mobile ad-hoc network is an infrastructure less network as it doesn’t follow any particular network topology. In MANET congestion is a major problem in small size networks congestion’s effect is low as compared to the large size networks. Congestion degrades the performance of overall network drastically. Many algorithms have been proposed to handle the congestion famous one are the active que management algorithms (AQMs). But still there is no universally accepted solution for it. In this paper a congestion control solution is devised using fuzzy logic controller. In this node density and load are taken as input and packet drop probability as output, which is effective to control congestion in large networks.

Triboelectric nanogenerator for smart traffic monitoring and safety

Vikas Narayan Thakur,Jeong In Han 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-

Traffic monitoring and safety are key for reducing road accidents because the road network is increasingrapidly and becoming completed day by day. Various energy harvesters and sensors have been inventedfor analyzing the factors involved in traffic movement like vehicle, road and environment. Among those,triboelectric nanogenerator (TENG) is considered to be advanced and next generation self-powered sensorsand energy harvester. Therefore, TENGs are widely studied and developed with various mechanismand structure. In this review article, we have studied the several mechanisms specific to the key elementsof traffic monitoring such as vehicle, road and environment. Since, without studying the shortcomings ofthe TENG, it is difficult to update the smart traffic monitoring system therefore along with the detailedstudy of several the design, structures and mechanism of TENG, challenges and limitations have also beenreviewed which will benefit the researchers working in this area and enhance the improvement in trafficmonitoring and safety.

Therapeutic potentials of Brassica juncea: an overview

Vikas Kumar,Ajit Kumar Thakur,Narottam Dev Barothia,Shyam Sunder Chatterjee 셀메드 세포교정의약학회 2011 TANG Vol.1 No.1

Diverse medicinal uses of different types of products obtainable from Brassica juncea have been known for centuries. Most such traditionally known uses of the plant have been centered on its seeds and oils obtainable from them. During more recent decades diverse bio-active molecules and their therapeutically interesting pharmacological properties of its green edible leaves have also been described, and they are now often considered to be effective substitutes for other so called “healthy” Brassica vegetables. However, little concentrated effort has yet been made to obtain a pharmacologically better defined phyto-pharmaceutical from this easily cultivable plant of commercial interest in many underdeveloped and developing countries. The main aim of this overview is to point out some possibilities for designing and developing such products from the plant for combating the rapidly spreading obesity epidemic in the developed countries and some other countries. Efforts to achieve such goals could as well be an economically more feasible, and culturally more acceptable, starting point for better understanding the potential health benefits of other vegetarian foods.

Hemorrhage complicating the course of severe acute pancreatitis

Vikas Gupta,Pradeep Krishna,Rakesh Kochhar,Thakur Deen Yadav,Venu Bargav,Asheesh Bhalla,Naveen Kalra,Jai Dev Wig 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.3

Backgrounds/Aims: The course of severe acute pancreatitis (SAP) complicated by hemorrhage is associated with poor outcome. Methods: Twenty-four (13%) out of 183 cases of SAP had hemorrhagic complications- 12 intraabdominal & 12 intraluminal, 13 had major & 11 had minor and 16 had de-novo & 8 post-surgical bleeding. The mean duration of pancreatitis prior to bleeding was 27±27.2 days. Results: Predictors of haemorrhage on univariate analysis were delayed admission (0.037), more than one organ failure (p=0.008), presence of venous thrombosis (p=0.033), infective necrosis (0.001) and systemic sepsis – bacterial (0.037) & fungal (p=0.032). On multivariate analysis infected necrosis (OR=11.82) and presence of fungal sepsis (OR=3.73) were the significant factors. Patients presenting with more than one organ failure and bacterial sepsis had borderline significance on multivariate analysis. Need for surgery (50% vs. 12.6%), intensive care stay (7.4±7.9 vs. 5.4±5.2 days) and mortality (41.7% vs. 10.7%) were significantly higher in patients who suffered haemorrhage. Seven of the 13 with major bleeding had pseudoaneurysms-4 were embolized, 4 needed surgery including 1 embolization failure. Seven with intraabdominal bleeding required surgical intervention, 2 had successful embolization and 3 had expectant management. CT severity index and surgical intervention, were significantly associated with intraabdominal bleeding. Organ failure, presence of pseudoaneurysm and surgical intervention were associated with major bleeding. Conclusions: Hemorrhage in SAP was associated with increased morbidity and mortality. Infected necrosis accentuated the degradation of the vessel wall, which predispose to hemorrhage. Luminal bleeding may be indicative of erosion into the adjacent viscera by the pseudoaneurysm.

Post-cholecystectomy acute injury: What can go wrong?

Vikas Gupta,Ashish Gupta,Thakur Deen Yadav,Bhagwant Rai Mittal,Rakesh Kochhar 한국간담췌외과학회 2019 Annals of hepato-biliary-pancreatic surgery Vol.23 No.2

Backgrounds/Aims: Most of the emphasis of postcholecystectomy injuries is laid on iatrogenic bilary trauma. However, they can involve a wide spectrum of injuries. Methods: We prospectively evaluated 42 patients with postcholecystectomy injuries referred to us from July 2011 to December 2012. Based on spectrum of injuries, we proposed an algorithm of management. Results: Injuries occurred following laparoscopy in 20 (2 converted) patients and open in 22 patients. Mean time of detection of injury was 4.32±2.33 days. The nature of drainage was bilious in 36, bile with blood in 2, only blood in 2, and enteric in 2. Nine had organ failure at presentation. Six (14%) needed re-operation. Source of hemorrhage was from right hepatic artery in three and small bowel mesentry in 1. Enteric injuries were one each to duodenum and colon. Six patient (14%) died. Advancing age and organ failure were the predictors of mortality. Persistant biliary fistula was seen in 5 (14%). Ten had lateral leaks that closed at 28.89±2.34 days. Twenty-two formed stricture which was successfully managed with definitive hepaticojejunostomy. Conclusions: Post cholecystectomy acute injury does not limit itself to bile duct or vascular injury but it can traumatize adjacent hollow viscus or mesentery. It is important to diagnose and intervene enteric injury early. Presentation and management for such injury should be followed as per the proposed algorithm.

Two Modifier (r, r-n) Approaches for Beam-Column Joint Under Seismic Loading

Vikas Mehta,Chey Min Ho,Mohindra Singh Thakur 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

Comparison of Spectrum of Complications after Pancreaticoduodenectomy in Patients with or without Preoperative Biliary Stents

( Thakur Deen Yadav ),( Hari Poudel ),( Vikas Gupta ),( Saroj K Sinha ),( Rakesh Kochhar ),( Virendra Singh ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: Preoperative biliary drainage (PBD) prior to Pancraticoduodenectomy (PD) continues to be routine in many centres despite sufficient evidence showing PBD to increase perioperative complications. This study was planned to see complications of PD and compare between stented and non-stented. Methods: Total 59 patients were enrolled in a period of one and half year. During surgery bile aspirate was sent routinely for culture sensitivity. Drain fluid amylase and LFT were obtained on day 3, 7 and 10. Morbidity was graded according to the Clavien-Dindo classification. Pancreatic fistula, haemorrhage and DGE were documented as per international guidelins. USG Abdomen was done on POD7. Patients were assessed daily for complications as per ISGPS definition. Results: Fifty Nine patients were enrolled. 21 were stented and 38 were not stented. Median age was 62 and 55 respectively.. DGE in 13 stented and 24 non-stented patients. Pancreatic fistula occurred in 7 (33%) stented and 8(21%) non -stented group. No significant difference was found in two groups.Fever was documented in 5 stented and 4 non-stented . Post PD haemorrhage occured in three patients and no difference between scented and non-stented. Bile culture was sterile in Two (9.5%) stented and 28 (73%) non stented patients. This was significant. Enterococci were most common isolate on stented patients accounting for 33% . E coli were most common among non-stetted . Conclusions: We could not find significant difference in morbidity, hospital stay and operative time between the stented and non-stented groups after Pancreaticoduodenectomy. There was significant difference in bile culture positivity.

RNAi knockdown of CAPAr gene affects survival and fecundity of Bemisia tabaci (Gennadius)

Thakur Sudeshna,Jindal Vikas 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3

Bemisia tabaci (Gennadius) Asia II 1 cause significant economic losses to cotton crop, directly by feeding on sap and indirectly through virus transmission. Although the current control methods are the combination of different tactics but still the chemical control is heavily relied. B. tabaci has gained resistance to majority of the in secticides which has made it difficult to manage this pest using synthetic chemicals. RNAi based gene silencing has been evolved as potential biochemical tool for specific gene silencing of target insect-pest and has been successfully demonstrated for Hemipteran insects. Here, we report the successful silencing of the CAPAr gene in B. tabaci which encodes for the G-protein coupled receptor (a transmembrane membrane peptide). Silencing of CAPAr gene resulted into reduced survival and fecundity of B. tabaci. Oral delivery of dsRNA mediated artificial diet corresponding to CAPAr gene resulted into significantly high adult mortality of 30.74% in treatment dsCAPAr 1.0 µg/µl after 48 hr of dsRNA feeding. A significant reduction in whitefly female fecundity was recorded for all the dsCAPAr concentrations with lowest value of 53.51 eggs per female in dsCAPAr 1.0 µg/µl. The relative gene expression of CAPAr gene further confirms the down regulation of CAPAr gene in knock down adult whiteflies. Our investigation proves the importance of CAPAr for B. tabaci survival and may be exploited as potential tool which can be strategic in integrated management programme for B. tabaci.

Potential of some traditionally used edible plants for prevention and cure of diabesity associated comorbidities

Vikas Kumar,Ajit Kumar Thakur,Suruchi Verma,Vaishali Yadav,Shyam Sunder Chatterjee 셀메드 세포교정의약학회 2015 셀메드 (CellMed) Vol.5 No.2

Medicinal uses of edible and other plants for prevention and cure of obesity and overweight associated metabolic and mental health problems have since long been known to scholars and practitioners of Ayurvedic and other traditionally known system of medicine. Modernized versions of numerous edible plant derived formulations mentioned in ancient Ayurvedic texts are at present some of the most popular, or best selling, herbal remedies in India and numerous other countries suffering from double burden of diseases caused by malnutrition and obesity. Preclinical and clinical information now available on edible plants and their bioactive constituents justify traditionally known medicinal uses of products derived from them for prevention and cure of obesity associated type-2 diabetes, psychopathologies and other health problems. Such information now available on a few edible Ayurvedic plants and their formulations and suggesting that their stress response regulating effects are involved in their broad spectrums of bioactivity profiles are summarized in this communication. Implications of recent physiological and pharmacological observations made with numerous phytochemicals isolated from edible plants for better understanding of traditionally known medicinal uses of herbal remedies are also pointed out.