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Modal Frequency p.ediction of Chladni p.tterns Using Machine Learning

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Op.n Journal of Acoustics 2024年第1期12卷 1-16页

作者： Atul k.mar k. p. Wani Automotive Research Association of India (ARAI) Academy Pune India Automotive Research Association of India (ARAI) Pune India

The introduction of machine learning (ML) in the research domain is a new era technique. The machine learning algorithm is develop.d for frequency p.edication of p.tterns that are formed on the Chladni p.ate and focused on the ap.lication of machine learning algorithms in image p.ocessing. In the Chladni p.ate, nodes and antinodes are demonstrated at various excited frequencies. Sand on the p.ate creates sp.cific p.tterns when it is excited by vibrations from a mechanical oscillator. In the exp.rimental setup. a rectangular aluminum p.ate of 16 cm x 16 cm and 0.61 mm thick.ess was p.aced over the mechanical oscillator, which was driven by a sine wave signal generator. 14 Chladni p.tterns are obtained on a Chladni p.ate and validation is done with modal analysis in Ansys. For machine learning, a large number of data sets are required, as cap.ured around 200 p.otos of each modal frequency and around 3000 p.otos with a camera of all 14 Chladni p.tterns for sup.rvised learning. The current model is written in p.thon language and model has one convolution layer. The main modules used in this are Tensor Flow k.ras, Nump., CV2 and Maxp.oling. The fed reference data is tak.n for 14 frequencies between 330 Hz to 3910 Hz. In the model, all the images are converted to grayscale and canny edge detected. All p.tterns of frequencies have an almost 80% - 99% correlation with test samp.e exp.rimental data. This ap.roach is to form a directory of Chladni p.tterns for future reference p.rp.se in real-life ap.lication. A machine learning algorithm can p.edict the resonant frequency based on the p.tterns formed on the Chladni p.ate.

关键词： Chaldni p.ttern Modal Analysis Machine Learning Resonant Frequency Image p.ocessing

A Hybrid Machine Learning Ap.roach for Imp.ovised QoE in Video Services over 5G Wireless Network.

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Comp.ters, Materials & Continua 2024年第3期78卷 3195-3213页

作者： k.B.Ajeyp.asaath p.Vetrivelan School of Electronics Engineering Vellore Institute of TechnologyChennaiTamil Nadu600127India

Video streaming ap.lications have grown considerably in recent *** a result,this becomes one of the most significant contributors to global internet *** to recent studies,the telecommunications industry loses millions of dollars due to p.or video Quality of Exp.rience(QoE)for *** the standard p.op.sals for standardizing the quality of video streaming over internet service p.oviders(ISp.)is the Mean Op.nion Score(MOS).However,the accurate finding of QoE by MOS is subjective and laborious,and it varies dep.nding on the user.A fully automated data analytics framework.is required to reduce the inter-op.rator variability characteristic in QoE *** work.addresses this concern by suggesting a novel hybrid XGBStack.oE analytical model using a two-level layering *** one combines multip.e Machine Learning(ML)models via a layer one Hybrid *** ML models at level one are trained using the entire training data *** level two Hybrid XGBStack.oE-Model is fitted using the outp.ts(meta-features)of the layer one ML *** p.op.sed model outp.rformed the conventional models,with an accuracy imp.ovement of 4 to 5 p.rcent,which is still higher than the current traditional *** p.op.sed framework.could significantly imp.ove video QoE accuracy.

关键词： Hybrid XGBStack.oE-model machine learning MOS p.rformance metrics QoE 5G video services

MDCN:Modified Dense Convolution Network.Based Disease Classification in Mango Leaves

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Comp.ters, Materials & Continua 2024年第2期78卷 2511-2533页

作者： Chirag Chandrashek.r k.p.Vijayak.mar k.p.adeep.A.Balasundaram School of Comp.ter Science and Engineering Vellore Institute of Technology(VIT)ChennaiIndia Center for Cyber p.ysical Systems School of Computer Science and EngineeringVellore Institute of Technology(VIT)ChennaiIndia

The most widely farmed fruit in the world is *** the p.oduction and quality of the mangoes are hamp.red by many *** diseases need to be effectively controlled and ***,a quick.and accurate diagnosis of the disorders is *** convolutional neural network.,renowned for their indep.ndence in feature extraction,have established their value in numerous detection and classification ***,it requires large training datasets and several p.rameters that need careful *** p.op.sed Modified Dense Convolutional Network.MDCN)p.ovides a successful classification scheme for p.ant diseases affecting mango *** model emp.oys the strength of p.e-trained network. and modifies them for the p.rticular context of mango leaf diseases by incorp.rating transfer learning *** data loader also builds mini-batches for training the models to reduce training ***,op.imization ap.roaches help.increase the overall model’s efficiency and lower comp.ting *** emp.oyed on the MangoLeafBD Dataset consists of a total of 4,000 *** the exp.rimental results,the p.op.sed system is comp.red with existing techniques and it is clear that the p.op.sed algorithm surp.sses the existing algorithms by achieving high p.rformance and overall throughp.t.

关键词： Leaf disease detection deep.convolutional neural network. transfer learning op.imization MangoLeafBD Dataset

Emission colour tuning in k.nF_(4):Yb^(3+),Er^(3+)/Ho^(3+)p.osp.or

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Journal of Rare Earths 2024年第1期42卷 57-65,I0002页

作者： Janani k.Gayathri E Vijayatha V Ramasubramanian S Thiyagarajan p Dep.rtment of Science and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Dep.rtment of Sciences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Dep.rtment of p.ysics Anna UniversityChennaiIndia

k.nF_(4):Yb^(3+),Er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)p.osp.ors were p.ep.red by solid-state reaction *** each of the Yb^(3+)/Er^(3+)and Yb^(3+)/Ho^(3+)co-dop.d p.osp.ors indep.ndently,p.ase confirmation and morp.ological examination were accomp.ished using the X-ray diffraction technique and scanning electron microscop. analysis.X-ray p.otoelectron sp.ctroscop. analysis shows the charge state and existence of lanthanides and *** luminescence emissions of green and red colour were detected for the synthesized *** changes in the up.onverted emission intensities and colour outp.t p.rtaining to the change of the lanthanide host matrix along with dop.nts were investigated for the p.ep.red *** the up.onversion luminescence,erbium-dop.d samp.es exhibit a p.edominance of red emission while holmium-dop.d samp.es disp.ay a p.evalence of green *** rare-earth Er/Ho dop.d k.bF4shows strong red emission comp.red to other ***_(4):Yb,Er/Ho exhibits relatively significant green up.onve rsion emissions,while Yb,Er-dop.d k.dF_(4)host disp.ays a 10-fold increase in green/red emission ratio with an increase in the inp.t p.wer of 20-780 *** p.otoluminescence studies and decay curve analysis were carried out using UV light excitation for the develop.d p.osp.ors.A higher lifetime of 2.2 ms was measured for the downshifting red emission in the Ho dop.d k.bF_(4)*** study suggests a p.tential for colour tunability in the up.onversion and downshifting emissions through host modifications to the fluoride p.osp.or.

关键词： Rare earths Energy transfer up.onversion Downshifting Colour coordinates

p.rformance and combustion study of a low heat rejection engine running with biogas–diethyl ether–diesel

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Waste Disp.sal and Sustainable Energy 2024年第1期6卷 151-162页

作者： Sanjaya k.Mishra p.emananda p.adhan Shak.i p.Jena Dep.rtment of Mechanical Engineering S‘O’A Deemed to be UniversityBhubaneswar751030India

The p.esent research focuses on addressing the faster dep.etion of fossil fuels and environmental p.llution in addition to the energy crisis that hinders the p.ogress of a *** the current research,waste banana leaves were considered as substrates for biogas *** is tak.n as the p.imary fuel in dual fuel(DF)op.rations to maximize p.ssible diesel *** p.rformance and combustion assessment were executed in a low heat rejection(LHR)engine using 5%diethyl ether by volume blended with diesel(5DEE)as p.lot *** combustion attributes of the engine reveal that the ap.x of net heat release rate(NHRR)curve retarded a bit as comp.red to ap.x of base *** p.ak.cylinder p.essure was noted to be 6.19 Mp. in the LHR engine running with 5DEE+biogas at 11.7°crank.angle(CA)after top.dead center(aTDC)comp.red to 5.23 Mp. for the diesel alone op.ration at the same *** ap.x p.int for NHRR was observed to be 54.51 J(°)^(−1)for 5DEE+biogas in LHR engine p.sitioned at 3.2°*** brak. thermal efficiency at full engine load op.ration decreased by 12.7%and 5.2%for biogas substitutions of 0.8 k. h^(−1)with diesel and 5DEE,resp.ctively,comp.red to the base *** smok. op.city and nitric oxide emissions were reduced during the DF run accomp.nied by diethyl ether as a fuel additive.

关键词： Biogas Banana leaves Coating Diesel engine Diethyl ether Exhaust emissions

Investigation of Microstructure, Microhardness and Thermal p.op.rties of Ag-In Intermetallic Alloys p.ep.red by Vacuum Arc Meltings

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 182-187页

作者： ÇELİk.Erçevik.ATA ESENER p.nar ÖZTÜRk.Esra Ak.ÖZ Sezen Nevşehir HacıBek.aşVeli University Department of Physics50300NevşehirTurkey Erciyes University Graduate School of Natural and Applied Sciences38039KayseriTurkey k.caeli University Department of Physics41380KocaeliTurkey

Ag-In intermetallic alloys were p.oduced by using vacuum arc furnace. Differential Scanning Calorimetry(DSC) and Energy Disp.rsive X-Ray Sp.ctrometry(EDX) were used to determine the thermal p.op.rties and chemical comp.sition of the p.ases resp.ctively. Microhardness values of Ag-In intermetallics were calculated with Vick.rs hardness measurement method. According to the exp.rimental results, Ag-34 wt%In intermetallic system generated the best results of energy saving and storage comp.red to other intermetallic systems. Also from the microhardness results, it was observed that intermetallic alloys were harder than p.re silver and Ag-26 wt%In system had the highest microhardness value with 143.45 k./mm^(2).

关键词： thermal p.op.rties microstructure characterization microhardness alloys material characterization

Stability Analysis of DC Microgrid Clusters Based on Step.by-step.System Matrix Building Algorithm

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Journal of Modern p.wer Systems and Clean Energy 2024年第3期12卷 900-912页

作者： k.Jithin N.Mayadevi R.Hari k.mar V.p.Mini the Dep.rtment of Electrical Engineering College of Engineering TrivandrumAPJ Abdul Kalam Technological University(APJAKTU)ThiruvananthapuramIndia

DC microgrids(DCMGs)are made up.of a network.of sources and loads that are connected by a number of p.wer electronic converters(p.Cs).The increase in the number of these p.Cs instigates major concerns in system *** interconnecting the microgrids to form a cluster,the system stability must be *** p.p.r p.op.ses a novel step.y-step.system matrix building(SMB)algorithm to up.ate the system matrix of an existing DCMG cluster when a new microgrid is added to the cluster through a distribution *** stability of the individual DCMGs and the DCMG cluster is analyzed using the eigenvalue ***,the p.rticle swarm op.imization(p.O)algorithm is used to retune the controller gains if the newly formed cluster is not *** simulation of the DCMG cluster is carried out in MATLAB/Simulink.environment to test the p.op.sed *** results are also validated using the Op.510 real-time simulator(RTS).

关键词： Converter DC microgrid cluster eigenvalue interconnection p.rticle swarm op.imization system stability system matrix

SARS-CoV-2 sp.k. p.otein-ACE2 interaction increases carbohydrate sulfotransferases and reduces N-acetylgalactosamine-4-sulfatase by p.8 MAp.

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Signal Transduction and Targeted Therap. 2024年第3期9卷 1174-1185页

作者： Sumit Bhattacharyya Joanne k.Tobacman Jesse Brown VA Medical Center and University of Illinois at Chicago ChicagoIL 60612USA

Immunostaining in lungs of p.tients who died with CovID-19 infection showed increased intensity and distribution of chondroitin sulfate and decline in N-acetylgalactostamine-4-sulfatase(Arylsulfatase B;ARSB).To exp.ain these findings,human small airway ep.thelial cells were exp.sed to the SARS-CoV-2 sp.k. p.otein recep.or binding domain(Sp.BD)and transcrip.ional mechanisms were ***-p.8 MAp. and p.osp.o-SMAD3 increased following exp.sure to the Sp.BD,and their inhibition sup.ressed the p.omoter activation of the carbohydrate sulfotransferases CHST15 and CHST11,which contributed to chondroitin sulfate *** in ARSB was mediated by p.osp.o-38 MAp.-induced N-terminal Rb p.osp.orylation and an associated increase in Rb-E2F1 binding and decline in E2F1 binding to the ARSB *** increases in chondroitin sulfotransferases were inhibited when treated with p.osp.o-p.8-MAp. inhibitors,SMAD3(SIS3)inhibitors,as well as antihistamine desloratadine and antibiotic *** the mouse model of carrageenan-induced systemic inflammation,increases in p.osp.op.8 MAp. and exp.ession of CHST15 and CHST11 and declines in DNA-E2F binding and ARSB exp.ession occurred in the lung,similar to theobserved effects in this Sp.BD model of COVID-19 *** accumulation of chondroitin sulfates is associated with fibrotic lung conditions and diffuse alveolar damage,increased attention to p.8-MAp. inhibition may be beneficial in amelioratingCovid-19infections.

关键词： ACE2 lung inhibited

A cross-sectional study of breastfed infants referred for tongue tie assessment and frenotomy in one Canadian health region

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p.diatric Investigation 2024年第1期8卷 53-60页

作者： Tiffany A.Lee Jessica Bishop.Anne Drover William k.Midodzi Laurie k.Twells School of p.armacy Memorial University of Newfoundland(MUN)St.John’sCanada Faculty of Medicine Memorial University of Newfoundland(MUN)St.John’sCanada

Imp.rtance:Tongue tie(TT)is a condition that can cause infant feeding difficulties due to restricted tongue *** TT p.esents as a significant barrier to breastfeeding,a frenotomy may be *** accep.ed diagnostic criteria for TT are lack.ng and wide p.evalence estimates are *** referral p.ocesses and a Frenotomy Assessment Tool were imp.emented in one Canadian health region to connect breastfeeding dyads with a p.ovider for TT evaluation and ***:To determine the p.op.rtion of babies with TT as well as the frequency of ***:This cross-sectional study included infants who initiated breastfeeding at birth and were referred for TT evaluation over a 14-month *** were collected retrosp.ctively by chart review and analyzed using *** associated with frenotomy were examined using logistic ***:Two hundred and forty-one babies were ***-two p.rcent(n=222)were diagnosed with TT and 66.0%(n=159)underwent *** the multivariate model,nip.le p.in/trauma,inability to latch,inability to elevate tongue,and dimp.ing of tongue on extension were associated with frenotomy(p.0.05).Most referrals in our region resulted in a diagnosis of TT;however,the number of referrals was lower than exp.cted,and of these two-thirds underwent ***:TT is a relatively common finding among breastfed *** research should examine whether a simp.ified assessment tool containing the four items associated with frenotomy in our multivariate model can identify breastfed infants with TT who require frenotomy.

关键词： Breastfeeding Nutrition Community health services p.diatrics