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Vikas,Jayasimhadri M.,Haranath D. 한국물리학회 2024 Current Applied Physics Vol.58 No.-
Transparent, Eu3+ doped potassium tungstate tellurite (TKWZBiEu) glass matrices were successfully synthesized via employing the traditional melt quenching method and their thermal, structural and photoluminescent characteristics were thoroughly investigated. To estimate the aggregate weight loss, glass transition temperature (Tg) and thermal stability factor (ΔT) of the prepared host glass matrix, thermogravimetric analysis-differential scanning calorimetry (TGA-DSC) were utilized. The non-crystalline character of the prepared TKWZBiEu glass was studied via XRD profile. Various vibrational functional groups were revealed via employing Fourier transform infrared (FT-IR) spectroscopy. The optical bandgap (Eopt) values for all prepared TKWZBiEu glasses have been evaluated by employing the absorption spectra. Under n-UV and blue excitations, all the prepared TKWZBiEu glasses are demonstrating reddish emission at 614 nm ascribed to the 5D0 → 7F2 transition, in which the intensity is increasing continuously with Eu3+ ion content up to 5.0 mol%. The experimental lifetime (τ) profiles demonstrate the single-exponential nature of prepared TKWZBiEu glasses under n-UV excitation. Furthermore, temperature dependent photoluminescence (TDPL) spectra indicate excellent thermal stability of the TKWZBiEu glass matrix with the highest value of activation energy (ΔE). The prototype organic epoxy resin/ binder-free device has been developed using the 5.0 mol% Eu3+ doped with TKWZBi glass matrix and n-UV LED chip. All the aforementioned findings validate that the optimized TKWZBiEu glass is an auspicious candidate for the red component to fabricate organic epoxy-free w-LEDs.
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.
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.
Residual gall bladder: An emerging disease after safe cholecystectomy
Vikas Gupta,Anil Kumar Sharma,Pradeep Kumar,Mantavya Gupta,Ajay Gulati,Saroj Kant Sinha,Rakesh Kochhar 한국간담췌외과학회 2019 Annals of hepato-biliary-pancreatic surgery Vol.23 No.4
Backgrounds/Aims: Residual gallbladder mucosa left after subtotal/partial cholecystectomy is prone to develop recurrent lithiasis and become symptomatic, which mandates surgical removal. Methods: we retrospectively evaluated the patients with residual gallbladder referred to us from January 2011 to December 2017. Based on MRCP we classified calot’s anatomy to – type I where cystic duct was seen and type II where sessile GB stump was seen. Results: 21 patients with median age 38 years and M:F::1:9.5, had undergone cholecystectomy (3 months-20 years) prior, presented with recurrent biliary pain. 3 had jaundice (CBD stone, Mirizzi and biliary stricture), 1 had pancreatitis and one had malignancy of the GB. Imaging revealed type I anatomy in 14 (67%) and type II in 7 (33%). All underwent completion cholecystectomy – open in 18 and laparoscopic in 3 (one converted to open). Additional procedure was required in 5 patients – CBD exploration in 2 (10%) and one each Hepatico-jejunostomy, extended cholecystectomy and splenectomy. Median hospital stay was 1 day. There was no mortality and 10% morbidity. One patient with malignancy died at 2 years, two died of unrelated cause, one developed incisional hernia and the remaining were well at a median follow up of 29 months. Conclusions: Residual GB lithiasis should be suspected if there are recurrent symptoms after cholecystectomy. MRCP based proposed classification can guide the management strategy. Completion cholecystectomy is curative.
Impulse Controllability and Impulse Elimination in Rectangular Descriptor Systems
Vikas Kumar Mishra,Nutan Kumar Tomar,Mahendra Kumar Gupta 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
In this paper, a decomposition of system matrices of linear time invariant rectangular descriptor systems is proposed. Using the decomposition, a technique is developed to check the impulse controllability for rectangular descriptor systems. Necessary and sufficient conditions are stated and proved to design a proportional plus derivative feedback such that the closed loop system is free of impulse. Examples are given to illustrate the presented theory.
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.
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.
Short-term Salt and PEG Stresses Regulate Expression of MicroRNA, miR159 in Sugarcane Leaves
Vikas Yadav Patade,Penna Suprasanna 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.3
MicroRNAs (miRNAs) are involved in the regulation of stress-responsive gene expression and stress adaptation. Transcript expression of mature miR159 was studied in sugarcane leaves stressed for long-term (15 days) NaCl (150 mM) or iso-osmotic PEG 8000(20% w/v) and for short period (up to 24 h) with NaCl (200 mM) or PEG (20% w/v). The results revealed no significant changes in transcript levels of the miRNA in response to the long-term stress however, short-term salt or PEG stress led to significant up-regulation over the control. Progressive increase in transcripts of the miRNA was observed under short-term PEG stress with exposure period. Using computational tools, various members of the MYB transcription factor family were predicted as the potential targets of miR159. The transcript expression of the MYB-related gene indicated up-regulation at 1 h of salt stress with concomitant slight downregulation of the miRNA. In addition, under short-term PEG stress, the transcript levels of MYB and miR159 were the opposite of each other, suggesting MYB as a potential target of miR159. To our knowledge, this is the first preliminary evidence on the involvement of miR159 in abiotic stress responses in sugarcane.