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Crystal structure and luminescence dynamics of highly pure LiM(PO_(3))_(3):Eu^(3+)(M=Sr,Ca) red phosphors for white light emitting diodes

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Journal of Rare Earths 2024年第8期42卷 1470-1478,I0002页

作者： Payal Khajuria M.Manhas A.K.Bedyal Ankush Vij H.C.Swart vinay kumar Department of Physics and Astronomical Sciences Central University of JammuRahy-Suchani.Samba1143J&KIndia Department of Physics School of SciencesCluster University of JammuCanal RoadJammu180001India Department of Physics University of Petroleum and Energy StudiesDehradunUttarakhand248007India Department of Physics University of the Free StatePO.Box 339BloemfonteinZA 9300South Africa

Highly pure red phosphors LiM(PO_(3))_(3):Eu^(3+)(M=Sr,Ca) doped with Eu^(3+)(1 mol%) were synthesized via solution combustion method and their crystal structure and luminescence dynamics were studied to explore its suitability in white light emitting *** Rietveld refinement analysis of the powder Xray diffraction patterns reveals that the phosphors belong to the pure triclinic phase of LiSr(PO_(3))_(3) and LiCa(PO_(3)) with space group P-1(2).The scanning electron microscopy images showed the agglomerated *** photoluminescence emission spectra under 393 nm show an orange band at 594 nm and a red band at 613 nm ascribed to ^(5)D_(0)→^(7)F_(1).^(5)D_(0)→^(7)F_(2) transitions of Eu^(3+)ion in both the ***,the spectroscopic properties such as luminescence behaviour,and Stark splitting were used to examine the symmetry of Eu^(3+)ions in LiM(PO_(3))_(3):Es^(3+)(M=Sr,Ca) phosphors in terms of distortion induced upon *** Stark splitting shows that the actual site symmetry for Eu^(3+)ion was estimated to be D_(2) type for both *** photometric properties of LiCa(PO_(3))_(3):Eu^(3+)such as Commission International de l'Eclairage coordinates(x=0.64,y=0.36) near to the standard one(red),high color purity(95%) and higher brightness reveal that the phosphor has the capability of acting as a red component in n-UV white light emitting diodes.

关键词： Photoluminescence Phosphate WLEDs Stark splitting Rare earths

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Multiple Forgery Detection in Video Using Convolution Neural Network

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Computers, Materials & Continua 2022年第10期73卷 1347-1364页

作者： vinay kumar Vineet Kansal Manish Gaur Centre for Advanced Studies Dr.A P J Abdul Kalam Technical UniversityLucknowIndia Institute of Engineering and Technology Dr.A P J Abdul Kalam Technical UniversityLucknowIndia

With the growth of digital media data manipulation in today’s era due to the availability of readily handy tampering software,the authenticity of records is at high risk,especially in *** is a dire need to detect such problem and do the necessary *** this work,we propose an approach to detect the interframe video forgery utilizing the deep features obtained from the parallel deep neural network model and thorough analytical *** proposed approach only uses the deep features extracted from the CNN model and then applies the conventional mathematical approach to these features to find the forgery in the *** work calculates the correlation coefficient from the deep features of the adjacent frames rather than calculating directly from the *** divide the procedure of forgery detection into two phases–video forgery detection and video forgery *** video forgery detection,this approach detect input video is original or *** the video is not original,then the video is checked in the next phase,which is video forgery *** the video forgery classification,method review the forged video for insertion forgery,deletion forgery,and also again check for *** proposed work is generalized and it is tested on two different *** experimental results of our proposed model show that our approach can detect the forgery with the accuracy of 91%on VIFFD dataset,90%in TDTV dataset and classify the type of forgery–insertion and deletion with the accuracy of 82%on VIFFD dataset,86%on TDTV *** work can helps in the analysis of original and tempered video in various domain.

关键词： Digital forensic forgery detection video authentication video interframe forgery video processing deep learning

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Performance Analysis of Multilayer Coil Based MI Waveguide Communication System

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Computers, Materials & Continua 2022年第9期72卷 5287-5300页

作者： Sandeep N.Dandu vinay kumar Joydeep Sengupta Neeraj D.Bokde Department of Electronics and Communications Engineering Visvesvaraya National Institute of TechnologyNagpur440010India Department of Electronics and Communications Engineering Motilal Nehru National Institute of TechnologyPrayagraj211002India Department of Civil and Architectural Engineering-Design and Construction 8000AarhusDenmark

In the non-conventional media like underwater and underground,the Radio Frequency(RF)communication technique does not perform well due to large antenna size requirement and high path *** such media,magnetic induction(MI)communication technique is very promising due to small coil size and constant channel *** the RF technique,the communication range in MI technique is relatively *** enhance this range,a waveguide technique is already brought in *** technique employs single layer coils to enhance the performance of MI *** further enhance the system functioning,in this paper,we investigated the performance of multi-layer coil(MLC)antenna based MI waveguide communication system in terms of transmission range,path loss,bit error rate(BER)and ***,the system performance is quantitatively evaluated in three different non-conventional media viz.,dry soil,fresh water and wet *** compared with the single layer counterpart,the MLC system shows a significant improvement in transmission range,BER even in loosely coupled scenarios and shows a corresponding reduction in path ***,the bandwidth is observed to be low(<1 KHz).In this analysis,the eddy current effects and parasitic capacitance are compared for single and multilayer *** is observed that the proposed system performs better in dry soil medium due to less medium conductivity.

关键词： Communication magnetic induction multilayer coil waveguide system

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Synergistic effect of hybrid Himalayan Nettle/Bauhinia-vahlii fibers on physico-mechanical and sliding wear properties of epoxy composites

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Defence Technology（防务技术） 2020年第4期16卷 762-776页

作者： Sandeep kumar KKSMer Brijesh Gangil vinay kumar Patel Department of Mechanical Engineering S.O.E.T.H.N.B.Garhwal UniversitySrinagar-Garhwal246174UttarakhandIndia Department of Mechanical Engineering Govind Ballabh Pant Institute of Engineering and Technology GhurdauriPauri Garhwal246001UttarakhandIndia

The cellulosic bast fibers are recognized as a justifiable and biodegradable substitute for producing moderate strength polymer composite materials because of their characteristics of renewability,ecofriendliness,and higher specific *** the aim of this research work is to fabricate Himalayan bast fibers(Nettle fiber(NF)/bauhinia vahlii fiber(BF)) based mono/hybrid epoxy composites at varying weight percentage of 2-6 wt% and evaluate the physical(void fraction and water absorption),mechanical(tensile strength,flexural strength,hardness) and sliding wear properties of as-fabricated *** 6 wt% NBF reinforced composites exhibited higher mechanical properties as compared to NF and BF composites with tensile strength of 34.04 MPa,flexural strength of 42.45 MPa,and hardness of 37.01 Hv *** influence of various control factors(sliding velocity,NF/BF/NBF contents,normal load and sliding distance) on specific sliding wear rate of composites was evaluated by Taguchi(three factors at three levels) experimental design and the percentage contribution of these selected parameters on sliding wear performance was examined by Analysis of variance(ANOVA).The sliding wear property of as-developed composites was found to be greatly influenced by sliding velocity and the wear resistance was observed to be improved with the NF/BF/NBF *** wear mechanism of the as-fabricated composites has been elucidated by scanning electron microscopy *** research outcomes demonstrated that the hybridization of Bauhinia vahlii fiber with Nettle fiber led to improve the mechanical and wear properties of epoxy composites.

关键词： Natural fiber Physical properties Mechanical properties Wear properties Taguchi analysis

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MULTISTAGE FILTERS FOR IDENTIFICATION OF EUKARYOTIC PROTEIN CODING REGIONS

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International Journal of Biomathematics 2012年第2期5卷 43-60页

作者： MALAYA kumar HOTA vinay kumar SRIVASTAVA Department of Electronics and Communication Engineering Motilal Nehru National Institute of Technology Allahabad-211004 Uttar PradeshIndia

A class of multistage filters, namely, real narrowband bandpass filter (RNBPF) has been previously used for identification of protein coding regions. This filter passes the frequency component at 2π/3 along with its conjugate. This conjugate frequency component may degrade the identification accuracy. To improve the identification accuracy, two types of multistage filters are proposed in this paper. A complex narrowband bandpass filter (CNBPF) is proposed for suppressing the conjugate frequency component which, in turn, reduces the background noise present in the deoxyribonucleic acid (DNA) spectrum and improves identification accuracy. By cascading RNBPF with moving average filter (RNBPFMA), another type of multistage filter is proposed. As moving average filter smooth out the rapid variations in the DNA spectrum, RNBPFMA improves the identification accuracy. The computational complexity of RNBPFMA is less than that of CNBPF. The RNBPF and proposed multistage filters are compared with previously reported short-time discrete Fourier transform (ST-DFT) method in terms of computational complexity. It is found that multistage filters reduce the computational load to a greater extent compared to ST-DFT method. The identification accuracy of the proposed CNBPF and RNBPFMA methods is compared with existing anti-notch filter and RNBPF methods. The results show that proposed methods outperform existing methods in terms of identification accuracy for benchmark data sets.

关键词：蛋白质编码区识别精度过滤器多级真核细胞带通滤波器离散傅立叶变换频率分量

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A multirate DSP structure for the identification of protein-coding regions

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International Journal of Biomathematics 2017年第8期10卷 125-139页

作者： Malaya kumar Hota vinay kumar Srivastava School of Electronics EngineeringVIT University Vellore 632014 Tamilnadu India Department of Electronics and Communication Engineering Motilal Nehru National Institute of Technology Allahabad 211004 Uttar Pradesh India

The identification of protein-coding regions in DNA sequence using digital signal processing methods is one of the central issues in bioinformatics. In this paper, a multirate structure is proposed for the identification of protein-coding regions whose input sampling rate is same as output sampling rate. The multirate structure consists of cascade combination of decimation filter, kernel filter and interpolation filter. The decimation filter is a complex filter, the kernel filter is an FIR lowpass filter and the interpolation filter isa moving average filter. Polyphase decomposition is applied on both decimation filter and interpolation filter for computationally efficient implementation. The potential of the proposed method is evaluated in comparison with existing methods using standard datasets. The results show that the proposed method improves the identification accuracy of protein-coding regions to a great extent compared to its counterparts.

关键词： Bioinformatics protein-coding regions multirate structure polyphase decomposition period-3 property

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Thermo-mechanical and tribological properties of SU-8/h-BN composite with SN150/perfluoropolyether filler

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Friction 2020年第1期8卷 151-163页

作者： Anand Singh RATHAUR Jitendra KKATIYAR vinay kumar PATEL Department of Mechanical Engineering Govind Ballabh Pant Institute of Engineering and Technology GhurdauriPauri GarhwalUttarakhand 246194India Department of Mechanical Engineering SRM Institute of Science and TechnologyKattankulathur CampusChennaiTamil Nadu 603203India

In this study, SU-8 and its composites are fabricated by blending 10 wt.% hexagonal boron nitride(h-BN) fillers with/without lubricants, such as 10 wt.% base oil(SN150) and 20 wt.% perfluoropolyether(PFPE). The thickness of SU-8 and its composites coating is fabricated in the range ~100–105 μm. Further, SU-8 and its composites are characterized by a 3D optical profilometer, atomic force microscopy, scanning electron microscopy, a thermal gravimetric analyzer, a goniometer, a hardness tester, and an optical microscope. Under a tribology test performed at different normal loads of 2, 4, and 6 N and at a constant sliding speed of 0.28 m/s, the reduction in the initial and steady-state coefficient of friction is obtained to be ~0.08 and ~0.098, respectively, in comparison to SU-8(~0.42 and ~0.75), and the wear resistance is enhanced by more than 103 times that of pure SU-8. Moreover, the thermal stability is improved by ~80–120 ℃, and the hardness and elastic modulus by ~3 and ~2 times that of pure SU-8, respectively. The SU-8 composite reinforced with 10 wt.% h-BN and 20 wt.% PFPE demonstrated the best thermo-mechanical and tribological properties with a nano-textured surface of high hydrophobicity.

关键词： SU‐8 boron nitride perfluoropolyether(PFPE) base oil(SN 150) in‐situ lubrication

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Genome recoding strategies to improve cellular properties: mechanisms and advances

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aBIOTECH 2021年第1期2卷 79-95页

作者： Tanya Singh Sudesh kumar Yadav Alexander Vainstein vinay kumar Department of Botany School of Basic SciencesCentral University of PunjabBathinda 151001India Center of Innovative and Applied Biotechnology Mohali 140306India Institute of Plant Sciences and Genetics in Agriculture The Hebrew University of JerusalemRehovotIsrael

The genetic code,once believed to be universal and immutable,is now known to contain many variations and is not quite *** basis for genome recoding strategy is genetic code variation that can be harnessed to improve cellular ***,genome recoding is a promising strategy for the enhancement of genome flexibility,allowing for novel functions that are not commonly documented in the organism in its natural ***,the basic concept of genetic code and associated mechanisms for the generation of genetic codon variants,including biased codon usage,codon reassignment,and ambiguous decoding,are extensively *** of the concept of natural genetic code expansion is also *** generation of recoded organisms and associated mechanisms with basic targeting components,including aminoacyl-tRNA synthetase–tRNA pairs,elongation factor EF-Tu and ribosomes,are highlighted for a comprehensive understanding of this *** research associated with the generation of diverse recoded organisms is also *** success of genome recoding in diverse multicellular organisms offers a platform for expanding protein chemistry at the biochemical level with non-canonical amino acids,genetically isolating the synthetic organisms from the natural ones,and fighting viruses,including SARS-CoV2,through the creation of attenuated *** conclusion,genome recoding can offer diverse applications for improving cellular properties in the genome-recoded organisms.

关键词： Genetic code Codon usage Protein engineering Attenuated virus

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Isolated hepatosplenic tuberculosis

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Hepatobiliary & Pancreatic Diseases International 2008年第3期7卷 328-330页

作者： vinay kumar Durgatosh Pandey Department of Surgical Oncology Institute of Medical SciencesBanaras Hindu UniversityVaranasi 221005India

BACKGROUND:Tuberculosis rarely involves the liver and spleen and when it does so,it is usually associated with disseminated disease. METHOD:We report a patient with isolated tuberculosis of the liver and spleen. RESULTS:A 50-year-old man presented with weakness and loss of weight for two *** scan of the abdomen showed multiple small hypodense lesions in the liver and ***-guided biopsy of liver lesion was inconclusive as it showed normal hepatocytes with interspersed *** laparotomy,the liver and spleen were studded with multiple small nodules.A 5-cm wedge of the liver was *** examination confirmed the diagnosis of tubercular hepatitis.A detailed work-up failed to identify any other focus of tuberculosis. CONCLUSION:Although rare,tuberculosis should also be considered in the differential diagnosis for multiple nodules in the liver and spleen,along with lymphoproliferative diseases and metastatic lesions.

关键词： tuberculosis liver spleen

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An unusual presentation of typhoid fever causing aseptic meningitis, acute pancreatitis, acute glomerulonephritis, acute hepatitis

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Chinese Medical Journal 2013年第2期126卷 397-398页

作者： vinay kumar Meena Nilesh kumar Rajani Nawal Department of General Medicine Institute of Medical Sciences Banaras Hindu University Varanasi Uttar Pradesh India Department of Obstetrics and Gynecology Sawai Man Singh(SMS)Medical College Jaipur Rajasthan India

To the editor： Typhoid lever is a very common infective cnsease in Asian and underdeveloped countries.1,2 Typhoid fever in itsfirst week of illness manifest with fever, headache, abdominal pain, gastrointestinal symptom like anorexia, nausea, vomiting, constipation; with or without specific signs like relative bradycardia, hepatomegaly, splenomegaly and abdominal tenderness developing in second week of illness. Complications like acute abdomen, intestinal perforation, pneumonia, psychosis, ataxia, altered sensorium, pancreatitis, hepatitis and nephritis are likely to develop in third to fourth week of illness.3,4 Initial presentation with aseptic meningitis, pancreatitis, hepatitis, glomerulonephritis and thrombocytopenia is a very rare manifestations of typhoid fever.5

关键词： An unusual presentation typhoid fever causing aseptic meningitis acute pancreatitis

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