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Highly Efficient Back‑End‑of‑Line Compatible Flexible si‑Based Optical Memristive Crossbar Array for Edge Neuromorphic Physiological signal Processing and Bionic Machine Vision

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Nano-Micro Letters 2024年第11期16卷 323-339页

作者： dayanand kumar Hanrui Li dhananjay d.Kumbhar Manoj kumar Rajbhar uttam kumar d.s Abdul Momin syed Georgian Melinte Nazek El‑Atab smart Advanced Memory Devices and Applications(SAMA)LaboratoryElectrical and Computer EngineeringComputer Electrical Mathematical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)23955‑6900 ThuwalSaudi Arabia

The emergence of the Internet-of-Things is anticipated to create a vast market for what are known as smart edge devices,opening numerous opportunities across countless domains,including personalized healthcare and advanced *** 3d integration,edge devices can achieve unprecedented miniaturization while simultaneously boosting processing power and minimizing energy ***,we demonstrate a back-end-of-line compatible optoelectronic synapse with a transfer learning method on health care applications,including electroencephalogram(EEG)-based.seizure prediction,electromyography(EMG)-based gesture recognition,and electrocardiogram(ECG)-based arrhythmia *** experiments on three biomedical datasets,we observe the classification accuracy improvement for the pretrained model with 2.93%on EEG,4.90%on ECG,and 7.92%on EMG,*** optical programming property of the device enables an ultralow power(2.8×10^(-13) J)fine-tuning process and offers solutions for patient-specific issues in edge computing ***,the device exhibits impressive light-sensitive characteristics that enable a range of light-triggered.synaptic functions,making it promising for neuromorphic vision *** d.splay the benefits of these intricate synaptic properties,a 5×5 optoelectronic synapse array is developed,effectively simulating human visual perception and memory *** proposed flexible optoelectronic synapse holds immense potential for advancing the fields of neuromorphic physiological signal processing and artificial visual systems in wearable applications.

关键词： Neuromorphic computing Electrophysiological signal Artificial vision system Image recognition Memristor

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dual-wavelength all-fiber Q-switched fiber laser using bismuth-doped fiber as saturable absorber

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Optoelectronics Letters 2024年第3期20卷 147-151页

作者： Aruna Ghosh Abdulkadir Mukhtar diblawe uttam kumar samanta Moh Yasin sulaiman Wadi Harun Mukul Chandra Paul Fiber Optics and Photonics division CSIR-Central Glass and Ceramic Research InstituteKolkata 700032India Physics department Jadavpur UniversityKolkata 700032India Photonics Engineering Laboratory Department of Electrical EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

A passively Q-switched all-fiber laser is demonstrated using a 10-cm-long bismuth-doped fiber(BdF) as a saturable absorber(sA). The dual-wavelength operation was obtained due to the nonlinear effect inside the fabricated BdF, which has a high germanium content. stable Q-switched pulses were obtained at the dual synchronous wavelengths of 1 530.1 nm and 1 531.1 nm. When the pump power is tuned from 105.3 mW to 191.0 mW, the repetition rate can be varied from 82.6 kMz to 117.6 kHz. The maximum pulse energy and average output power were 83.4 nJ and 9.8 mW, respectively while the minimum pulse width was 8.5 μs at the maximum pump power of 191.0 mW. Our results indicate that BdF could be a promising alternative optical modulator for pulsed fiber laser application.

关键词： fiber switched pump

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Enhancing fatigue performance of AZ31 magnesium alloy components fabricated by cold metal transfer-based wire arc directed energy deposition through LPB

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Journal of Magnesium and Alloys 2024年第4期12卷 1638-1662页

作者： shambhu kumar Manjhi srikanth Bontha A.s.s.Balan department of Mechanical Engineering National Institute of Technology KarnatakaSurathkalSrinivasanagarMangaloreKarnataka 575025India

Cold Metal Transfer-Based Wire Arc directed Energy deposition(CMT-WA-dEd)presents a promising avenue for the rapid fabrication of components crucial to automotive,shipbuilding,and aerospace ***,the susceptibility to fatigue of CMT-WA-dEd-produced AZ31 Mg alloy components has impeded their wid.spread adoption for critical load-bearing *** this study,a comprehensive investigation into the fatigue behaviour of WA-dEd-fabricated AZ31 Mg alloy has been carried out and compared to commercially available wrought AZ31 *** findings indicate that the as-deposited parts exhibit a lower fatigue life than wrought Mg alloy,primarily due to poor surface finish,tensile residual stress,porosity,and coarse grain microstructure inherent in the WA-dEd *** Plasticity Burnishing(LPB)treatment is applied to mitigate these issues,which induce significant plastic deformation on the *** treatment resulted in a remarkable improvement of fatigue life by 42%,accompanied by a reduction in surface roughness,grain refinement and enhancement of compressive residual stress ***,during cyclic deformation,WA-dEd.specimens exhibited higher plasticity and d.slocation density compared to both wrought and WA-dEd+LPB specimens.A higher fraction of Low Angle Grain Boundaries(LAGBs)in WA-dEd.specimens contributed to multiple crack initiation sites and convoluted crack paths,ultimately leading to premature *** contrast,wrought and WA-dEd+LPB specimens d.splayed a higher percentage of High Angle Grain Boundaries(HAGBs),which hindered d.slocation movement and resulted in fewer crack initiation sites and less complex crack paths,thereby extending fatigue *** findings underscore the effectiveness of LPB as a post-processing technique to enhance the fatigue performance of WA-dEd-fabricated AZ31 Mg alloy *** study highlights the importance of LPB surface treatment on AZ31 Mg components produced by CMT-WA-dEd to remove surface d

关键词： Wire arc additive manufacturing AZ31 Mg alloy Low plasticity burnishing Low cycle fatigue test strain amplitude

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Acoustical properties of a 3d printed honeycomb structure filled with nanofillers:Experimental analysis and optimization for emerging applications

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defence Technology（防务技术） 2024年第5期35卷 248-258页

作者： Jeyanthi subramanian Vinoth kumar selvaraj Rohan singh Ilangovan s Naresh Kakur Ruban Whenish school of Mechanical Engineering Vellore Institute of TechnologyChennai600127Tamil NaduIndia department of Mechanical Engineering SRM Institute of Science and TechnologyRamapuramChennai600089India department of Chemical Engineering and Materials science University of Southern CaliforniaLos Angeles90089USA Advanced Materials Research Centre Technology Innovation InstituteAbu Dhabi9639UAE Center for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVellore632014Tamil NaduIndia

The novelty of this research lies in the successful fabrication of a 3d-printed honeycomb structure filled with nanofillers for acoustic properties,utilizing an impedance tube setup in accordance with AsTM standard E *** Creality Ender-3,a 3d printer,was used for printing the honeycomb structures,and polylactic acid(PLA)material was employed for their *** organic,inorganic,and polymeric compounds within the composites were identified using fourier transformation infrared(FTIR)*** structure and homogeneity of the samples were examined using a field emission scanning electron microscope(FEsEM).To determine the sound absorption coefficient of the 3d printed honeycomb structure,numerous samples were systematically developed using central composite d.sign(CCd)and analysed using response surface methodology(RsM).The RsM mathematical model was established to predict the optimum values of each factor and noise reduction coefficient(NRC).The optimum values for an NRC of 0.377 were found to be 1.116 wt% carbon black,1.025 wt% aluminium powder,and 3.151 mm d.stance between parallel ***,the results demonstrate that a 3dprinted honeycomb structure filled with nanofillers is an excellent material that can be utilized in various fields,including defence and aviation,where lightweight and acoustic properties are of great importance.

关键词： 3d printing Honeycomb structure Acoustics Field emission scanning electron microscope Response surface methodology

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structural build-up model for three-dimensional concrete printing based on kinetics theory

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Frontiers of structural and Civil Engineering 2024年第7期18卷 998-1014页

作者： Prabhat Ranjan PREM P.s.AMBILY shankar kumar Greeshma GIRIdHAR dengwu JIAO Advanced Materials Laboratory CSIR-Structural Engineering Research CentreChennai 600113India department of Architecture and Civil Engineering City University of Hong KongHong Kong 999077China

The thixotropic structural build-up is crucial in extrusion-based three-dimensional(3d)concrete *** paper uses a theoretical model to predict the evolution of static and dynamic yield.stress for printed *** model employs a structural kinetics framework to create a time-independent constitutive link between shear stress and.shear *** model considers flocculation,deflocculation,and chemical hydration to anticipate structural *** reversible and irreversible contributions that occur throughout the build-up,breakdown,and hydration are defined based on the proposed.structural ***,detailed parametric studies are conducted to evaluate the impact of model *** is revealed that the proposed model is in good agreement with the experimental results,and it effectively characterizes the structural build-up of 3d printable concrete.

关键词： structural build-up rheology thixotropy 3d printable concrete kinetics theory ultra high performance concrete

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Thermodynamic properties and phase diagram of quark matter within non-extensive Polyakov chiral sU(3)quark mean field model

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Chinese Physics C 2024年第5期48卷 60-71页

作者： dhananjay singh Arvind kumar department of Physics Dr.B R Ambedkar National Institute of Technology JalandharJalandhar–144008PunjabIndia

In the present study,we applied Tsallis non-extensive statistics to investigate the thermodynamic properties and phase diagram of quark matter in the Polyakov chiral sU(3)quark mean field *** this model,the properties of the quark matter were modified through the scalar fieldsσ,ζ,δ,χ,vector fieldsω,ρ,ϕ,and Polyakov fieldsΦandΦ¯at finite temperature and chemical ***-extensive effects were introduced through a dimensionless parameter q,and the results were compared to those of the extensive case(q→1).In the non-extensive case,the exponential in the Fermi-dirac(Fd)function was modified to a q-exponential *** influence of the q parameter on the thermodynamic properties,pressure,energy,and entropy density,as well as trace anomaly,was *** speed of sound and.specific heat with non-extensive effects were also ***,the effect of non-extensivity on the deconfinement phase transition as well as the chiral phase transition of u,d,and.s quarks was *** found that the critical end point(CEP),which defines the point in the(T−μ)phase diagram where the order of the phase transition changes,shifts to a lower value of temperature,TCEP,and a higher value of chemical potential,μCEP,as the non-extensivity is increased,that is,q>1.

关键词： quark matter quark mean field model QCd phase diagram non-extensive statistics

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Comparison of the Anatomy and Adaptability of Reconstructed Teeth with Natural Teeth:An Innovative Approach in Forensic dentistry

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Journal of Forensic science and Medicine 2024年第1期10卷 47-54页

作者： supraja s P M Tejaswi Ravikanth Manyam Mohan kumar Pasupuleti swetha P Ramesh kumar Budumuru department of Oral and Maxillofacial Pathology Vishnu Dental CollegeBhimavaramAndhra PradeshIndia Vishnu dental College BhimavaramAndhra PradeshIndia department of Periodontics and Implantology Vishnu Dental CollegeBhimavaramAndhra PradeshIndia department of Oral Medicine and Radiology Vishnu Dental CollegeBhimavaramAndhra PradeshIndia

Background:Forensic tooth reconstruction is the technique of reconstructing the morphology of a missing tooth from the intra-alveolar morphology of dental sockets from skeletal *** and Objectives:The aim and objective of the study are to compare and investigate whether the anatomy and adaptability of reconstructed teeth simulate with the natural tooth and to investigate whether the dental materials have potential in reconstruction of *** and Methods:An in vitro experimental study was undertaken on a human *** to the Fédération dentaire Internationale,charting will be done based on the number of teeth *** entire study will be conducted in three phases using dental *** 1 comprised preparation for negative replica,where an impression will be taken,Phase 2 comprised preparation of a positive replica or cast,and Phase 3 comprised tooth reconstruction using the flowable ***:The specimen tooth(which had been taken from its socket)and the newly constructed tooth were compared,and when the length of the newly constructed root was measured using digital vernier calipers,there was a d.sparity of 0.5-1 *** cone-beam computed tomography radiographs demonstrated the necessary ***:The present study demonstrated that dental information can be obtained even when teeth are absent postmortem by making an attempt to recreate the teeth using dental materials while documenting the intra-alveolar anatomy of the dental root socket.

关键词： Adaptability anatomy reconstruction teeth

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Constructing a biofunctionalized 3d-printed gelatin/sodium alginate/chitosan tri-polymer complex scaffold with improvised biological andmechanical properties for bone-tissue engineering

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Bio-d.sign and Manufacturing 2024年第1期7卷 57-73页

作者： Amit kumar singh Krishna Pramanik Amit Biswas Centre of Excellence in Tissue Engineering Department of Biotechnology and Medical EngineeringNational Institute of TechnologyRourkela 769008India

sodium alginate(sA)/chitosan(CH)polyelectrolyte scaffold is a suitable substrate for tissue-engineering *** present study deals with further improvement in the tensile strength and biological properties of this type of scaffold to make it a potential template for bone-tissue *** experimented with adding 0%–15%(volume fraction)gelatin(GE),a protein-based biopolymer known to promote cell adhesion,proliferation,and *** resulting tri-polymer complex was used as bioink to fabricate sA/CH/GEmatrices by three-dimensional(3d)*** studies using scanning electron microscopy revealed the microfibrous porous architecture of all the structures,which had a pore size range of 383–419μm.X-ray diffraction and Fourier-transform infrared.spectroscopy analyses revealed the amorphous nature of the scaffold and the strong electrostatic interactions among the functional groups of the polymers,thereby forming polyelectrolyte complexes which were found to improve mechanical properties and.structural *** scaffolds exhibited a d.sirable degradation rate,controlled.swelling,and hydrophilic characteristics which are favorable for bone-tissue *** tensile strength improved from(386±15)to(693±15)kPa due to the increased.stiffness of sA/CH scaffolds upon addition of *** enhanced protein adsorption and in vitro bioactivity(forming an apatite layer)confirmed the ability of the sA/CH/GE scaffold to offer higher cellular adhesion and a bone-like environment to cells during the process of tissue *** vitro biological evaluation including the MTT assay,confocal microscopy analysis,and alizarin red.s assay showed a significant increase in cell attachment,cell viability,and cell proliferation,which further improved biomineralization over the scaffold *** addition,sA/CH containing 15%gelatin d.signated as sA/CH/GE15 showed.superior performance to the other fabricated 3d.structures,demonstrating its pote

关键词： scaffold Biomaterial sodium alginate Chitosan Gelatin 3d printing Tissue engineering

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Negative stiffness Mechanism on An Asymmetric Wave Energy Converter by Using A Weakly Nonlinear Potential Model

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China Ocean Engineering 2024年第4期38卷 689-700页

作者： sunny kumar POGULURI dongeun KIM Yoon Hyeok BAE department of Ocean Engineering IIT MadrasChennaiIndia Multid.sciplinary Graduate school Program for Wind Energy Jeju National UniversityJejuRepublic of Korea Mechanical and.system d.sign Engineering Hongik UniversitySeoulRepublic of Korea

salter's duck,an asymmetrical wave energy converter(WEC)device,showed high efficiency in extracting energy from 2d regular waves in the past;yet,challenges remain for fluctuating wave *** can potentially be addressed by adopting a negative stiffness mechanism(NsM)in WEC devices to enhance system efficiency,even in highly nonlinear and.steep 3d waves.A weakly nonlinear model was developed which incorporated a nonlinear restoring moment and NsM into the linear formulations and was applied to an asymmetric WEC using a time domain potential flow *** model was initially validated by comparing it with published experimental and numerical computational fluid dynamics *** current results were in good agreement with the published *** was found that the energy extraction increased in the range of 6%to 17%during the evaluation of the effectiveness of the NsM in regular *** irregular wave conditions,specifically at the d.sign wave conditions for the selected test site,the energy extraction increased by 2.4%,with annual energy production increments of approximately *** findings highlight the potential of NsM in enhancing the performance of asymmetric WEC devices,indicating more efficient energy extraction under various wave conditions.

关键词： asymmetric wave energy converter negative stiffness mechanism weakly nonlinear potential flow power

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Correction:Highly Efficient Back-End-of-Line Compatible Flexible si-Based Optical Memristive Crossbar Array for Edge Neuromorphic Physiological signal Processing and Bionic Machine Vision

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Nano-Micro Letters 2024年第12期16卷 133-133页

作者： dayanand kumar Hanrui Li dhananjay d.Kumbhar Manoj kumar Rajbhar uttam kumar d.s Abdul Momin syed Georgian Melinte Nazek El-Atab smart Advanced Memory Devices and Applications(SAMA)LaboratoryElectrical and Computer EngineeringComputer Electrical Mathematical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)23955-6900 ThuwalSaudi Arabia

Following publication of the original article[1],the authors noticed a mistake in the supplementary file,more specifically in figures s11 and.s12 where they used by mistake the same *** original article[1]has been cor... 详细信息

关键词： Mem Crossbar Highly

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