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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： S.SAUrABH r.KIrAN D.SINGH r.vaish V.S.CHAUHAN School of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHSDT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. Various helicoidal layup configurations including helicoidal recursive(Hr), helicoidal exponential(HE), helicoidal semi-circular(HS), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is validated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

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Piezoelectric material selection for transducers under fuzzy environment

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Journal of Advanced Ceramics 2013年第2期2卷 141-148页

作者： Gaurav VATS rahul vaish School of Engineering Indian Institute of Technology MandiHimachal Pradesh 175001India

Piezoelectric ceramics are extensively investigated materials for transducer *** selection of optimal piezoelectric material for this particular application is a tedious *** depends upon various physical properties,including piezoelectric charge coefficient(d33),electromechanical coupling factor(K_(p)),dielectric constant(ε_(r)),and dielectric loss(tanδ).The classical multiple attribute decision making(MADM)can be used for decision making if these properties are known ***,these properties cannot be expressed by exact numerical values,since they are dependent upon the microstructure and fabrication ***-based MADM approaches can be helpful in such *** this paper,we have determined the ranks and rank indices(for degree of closeness)of important piezoelectric materials using fuzzy VlseKriterijumska Optimisacija I Kompromisno resenje(VIKOr)***(8/65/35)((Pb_(1-x)La_(x))(Zr_(y)Ti_(1-y))O_(3))and KNN-LT-LS((K_(0.44)Na_(0.52)Li_(0.04))-(Nb0_(.84)Ta_(0.10)Sb_(0.06))O_(3))consecutively are found to be the top-rank piezoelectric *** indicates that KNN-LT-LS can be used on behalf of lead-based piezo-ceramics.

关键词： piezoceramics selection MADM fuzzy approach transducer application

Universal converse flexoelectricity in dielectric materials via varying electric field direction

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International Journal of Smart and Nano Materials 2021年第1期12卷 107-128页

作者： Saurav Sharma rajeev Kumar rahul vaish School of Engineering Indian Institute of Technology MandiMandiIndia

Flexoelectricity is a symmetry independent electromechanical cou-pling phenomenon that outperforms piezoelectricity at micro and nanoscales due to its size-dependent behavior arising from gradi-ent terms in its constitutive ***,due to this gradient term flexoelectricity,to exhibit itself,requires specially designed geometry or material composition of the dielectric *** of its kind,the present study put forward a novel strategy of achieving electric field gradient and thereby converse flexoelectri-city,independent of geometry and material composition of the *** spatial variation of the electric field is established inside the dielectric material,Ba_(0.67)Sr_(0.33)TiO_(3)(BST),by manipulating electrical boundary *** unique patterns of electrode placement are suggested to achieve this spatial *** varying direction of electric field gives rise to electric field gradient,the prerequisite of converse flexoelectricity.A multi-physics cou-pling based theoretical framework is established to solve the flexo-electric actuation by employing isogeometric analysis(IGA).Electromechanically coupled equations of flexoelectricity are solved to obtain the electric field distribution and the resulting displace-ments *** maximum displacements of 0.2 nm and 2.36 nm are obtained with patterns I and II,respectively,while pattern III can yield up to 85 nm of maximum displacement.

关键词： Converse flexoelectricity electrical boundary conditions electric field direction isogeometric analysis

Global trend of publications in orthopaedics and sports medicine:1996-2021

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Chinese Journal of Traumatology 2024年第6期27卷 368-371页

作者： raju vaishya Abhishek vaish Department of Orthopaedics and Joint replacement Surgery Indraprastha Apollo HospitalSarita ViharNew Delhi110076India

We studied the publication trend in the field of orthopaedics and sports medicine over the last 25 years(1996-2021),by various countries,and regions of the *** was an increasing trend in publications,across the *** of the Asian countries like China and India have shown a substantial growth in their research *** continent has contributed the most publications in the last 25 years,whereas the United States as a country has been on the top of the list of *** research-publications came from high-income countries and disproportionately less from low-and middle-income countries.

关键词： Publications research Orthopedics Sports medicine Medicine

Pencil drawn interdigitated capacitive sensors on wood substrate

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Advanced Sensor and Energy Materials

Advanced Sensor and Energy Materials 2024年第4期3卷 10-17页

作者： Abhay Singh Thakur Vinit Srivastava rahul vaish Indian Institute of Technology Mandi Himachal PradeshIndia

This research presents the fabrication and characterization of an interdigitated capacitive(IDC)sensor on a wooden substrate using pencil *** resistance of the pencil traces decreased from 100 kΩto 5 kΩas the pencil grade shifted from HB to ***,capacitance measurements revealed an increase from approximately 5 pF for a 5-finger IDC made with HB pencil to around 32 pF for an 8B pencil *** the number of pencil traces from 10 to 50 resulted in a significant decrease in resistance and a proportional increase in *** of the IDC sensor demonstrated notable changes in capacitance upon proximity and touch,with a significant decrease upon *** interdigitated capacitance sensor exhibits good proximity effects and contact sensitivity in touch,with capacitance increasing exponentially from 0.3 pF(7 cm)to 1.2 pF(direct contact),highlighting its ability to detect objects with high ***,environmental factors such as temperature and humidity influence capacitance *** findings underscore the potential of pencil-drawn IDC sensors for responsive and adaptable applications in various fields.

关键词： Pencil Wood Sensors Capacitor Triple-mode sensor

Piezoelectric materials selection for sensor applications using finite element and multiple attribute decision-making approaches

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Journal of Advanced Dielectrics 2015年第1期5卷 21-28页

作者： Anuruddh Kumar Anshul Sharma rajeev Kumar rahul vaish Vishal S Chauhan C.r.Bowen School of Engineering Indian Institute of Technology Mandi Himachal Pradesh 175001India Department of Mechanical Engineering University of Bath BathBA27AYUK

This paper examines the selection and performance evaluation of a variety of piezoelectric materials for cantilever-based sensor *** finite element analysis method is implemented to evaluate the relative importance of materials properties such as Young's Modulus(E),piezoelectric stress constants(e_(31)),dielectric constant(ε)and Poisson's ratio(ν)for cantilever-based sensor *** analytic hierarchy process(AHP)is used to assign weights to the properties that are studied for the sensor structure under study.A technique for order preference by similarity to ideal solution(TOPSIS)is used to rank the performance of the piezoelectric materials in the context of sensor voltage *** ranking achieved by the TOPSIS analysis is in good agreement with the results obtained from finite element method *** numerical simulations show that K_(0.5)Na_(0.5)NbO_(3)-LiSbO_(3)(KNN-LS)materials family is important for sensor ***'s modulus(E)is most influencing material's property followed by piezoelectric constant(e_(31)),dielectric constant(ε)and Poisson's ratio(ν)for cantilever-based piezoelectric sensor applications.

关键词： Lead-free piezoelectric ceramics finite element modeling analytical hierarchy process material selection

ELECTrICAL TrANSPOrT STUDIES IN 3Na_(2)O-6:5B_(2)O_(3) GLASSES

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Journal of Advanced Dielectrics 2011年第3期1卷 331-336页

作者： rAHUL vaish KALIDHINDI B.r.VArMA Materials research Centre Indian Institute of Science Bangalore 560012India

Transparent 3Na_(2)O-6:5B_(2)O_(3)(NBO)glasses were fabricated via the conventional melt-quenching technique.X-ray powder difraction(XrD)combined with Differential Scanning Calorimetric(DSC)studies carried out on the as-quenched samples confirmed their amorphous and glassy nature,*** frequency and temperature dependent of the dielectric constant,electric modulus and electrical conductivity of the transparent NBO glasses were investigated in the 100 Hz-10 MHz frequency *** electrical modulus and conductivity data have been rationalized using Jonscher's universal *** bulk dc conductivity at various temperatures was extracted from the electrical relaxation *** activation energy associated with dc conduc-tivity is 0.52±0.01 eV,which is ascribed to the motion of Na^(+)ions in the glass matrix.

关键词： Glass dielectric relaxation conductivity

Bioinformatic Analysis of SArS-CoV-2 Genomes to Develop a Universal Coronavirus Vaccine

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Journal of Biosciences and Medicines 2022年第10期10卷 84-97页

作者： Anya vaish James McSwiggen Tesla STEM High School Redmond USA McSwiggen Biotech Consulting LLC Arvada USA

COVID-19 is caused by the SArS-CoV-2 virus. Current rNA vaccines Pfizer/BioNTech’s BNT162b2 and Moderna’s mrNA-1273 are more than 94% successful in preventing infection. The spike protein of the virus is essential for the interaction and internalization of the virus in the host cell and is considered a prime target for vaccine development against the SArS virus. This study aims to identify highly conserved sequences in spike protein or other sections of the viral genome that can potentially be used to develop a universal coronavirus vaccine. Bioinformatic analysis of 258,269 full-length SArS-CoV-2 genomic sequences in the NCBI database was carried out using a custom Perl Script. All sequences were compared to the spike protein and full-length viral genome reference to find 100 nucleotide-long segments that were at least 99% conserved across SArS-CoV-2 sequences. The analysis resulted in a >99.5% conserved 114-nucleotide segment on the spike protein and a 99.49% conserved 104-nucleotide segment on the non-spike protein section of the viral genome. The conserved sequences from this study may be useful in developing an rNA or protein vaccine that may be effective against future SArS-CoV-2 strains or could act as a universal vaccine if these sequences are present in other coronavirus families.

关键词： Coronavirus S-Protein Spike Protein Conservation Universal Vaccine Bioinformatics

An Automatic Threshold Selection Using ALO for Healthcare Duplicate record Detection with reciprocal Neuro-Fuzzy Inference System

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Computers, Materials & Continua 2023年第3期74卷 5821-5836页

作者： Ala Saleh Alluhaidan Pushparaj Anitha Subbappa Ved Prakash Mishra P.V.Chandrika Anurika vaish Sarthak Sengupta Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadhKSA.P.O.Box:8442811671 Department of Electronics and Communication Engineering National Institute of Technical Teacher Training and ResearchChandigarh160019India Department of Periodontology JSS Dental College&HospitalJSS Academy of Higher Education and ResearchMysuru570015India Department of Computer Science and Engineering Amity UniversityDubai345019United Arab Emirates Department of Management/Economics Prin LN Welingkar Institute of Management Development and ResearchMumbai400019India Department of Management Studies Indian Institute of Information TechnologyAllahabad211012India

ESystems based on EHrs(Electronic health records)have been in use for many years and their amplified realizations have been felt *** still have been pioneering collections of massive volumes of health *** detections involve discovering records referring to the same practical components,indicating tasks,which are generally dependent on several input parameters that experts *** linkage specifies the issue of finding identical records across various data *** similarity existing between two records is characterized based on domain-based similarity functions over different ***-duplication of one dataset or the linkage of multiple data sets has become a highly significant operation in the data processing stages of different data mining *** objective is to match all the records associated with the same *** measures have been in use for representing the quality and complexity about data linkage algorithms,and many other novel metrics have been *** outline of the problem existing in themeasurement of data linkage and de-duplication quality and complexity is *** article focuses on the reprocessing of health data that is horizontally divided among data custodians,with the purpose of custodians giving similar features to sets of *** first step in this technique is about an automatic selection of training examples with superior quality from the compared record pairs and the second step involves training the reciprocal neuro-fuzzy inference system(rANFIS)*** the Optimal Threshold classifier,it is presumed that there is information about the original match status for all compared record pairs(i.e.,Ant Lion Optimization),and therefore an optimal threshold can be computed based on the respective ***,Clinical Decision(CD),and Cork Open research Archive(COrA)data repository help analyze the proposed method with evaluated benchmarks with current techniques.

关键词： Duplicate detection healthcare record linkage dataset pre-processing reciprocal neuro-fuzzy inference system and ant lion optimization fuzzy system

Virtual preoperative planning and 3D printing are valuable for the management of complex orthopaedic trauma

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Chinese Journal of Traumatology 2019年第6期22卷 350-355页

作者： Abhishek Mishra Tarun Verma Abhishek vaish riya vaish raju vaishya Lalit Maini Department of Orthopaedics and Joint replacement Surgery Maulana Azad Medical CollegeLok Nayak HospitalNew Delhi 110001India Department of Orthopaedics and Joint replacement Surgery Indraprastha Apollo HospitalSaritaViharNew Delhi 110076India

Purpose:The technology of 3D printing(3DP)exists for quite some time,but it is still not utilized to its full potential in the field of orthopaedics and traumatology,such as underestimating its worth in virtual preoperative planning(VPP)and designing various models,templates,and *** can be a significant tool in the reduction of surgical morbidity and better surgical outcome avoiding various associated ***:An observational study was done including 91 cases of complex trauma presented in our institution requiring operative *** preoperative planning and 3DP were used in the management of these *** managing these cases were given a set of questionnaire and responses were recorded and assessed as a quantitative ***:In all the 91 cases,where VPP and 3DP were used,the surgeons were satisfied with the outcome which they got intraoperatively and *** time was reduced,with a better *** dimensional models of complex fracture were helpful in understanding the anatomy and sketching out the plans for optimum reduction and *** average score of the questionnaire was 4.5,out of a maximum of 6,suggesting a positive role of 3DP in ***:3DP is useful in complex trauma management by accurate reduction and placement of implants,reduction of surgical time and with a better *** there is an initial learning curve to understand and execute the VPP and 3DP,these become easier with practice and experience.

关键词： Three-dimensional printing Bone fractures Fracture dislocation X-ray computed tomography