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Spalling characteristics of high-temperature treated granitic rock at different strain rates

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1280-1288页

作者： l.F.Fan Q.H.Yang X.l.Du The Key laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing100124China

The dynamic spalling characteristics of rock are important for stability analysis in rock *** paper presented an experimental inv.stigation on the dynamic spalling characteristics of granite with different temperatures and strain rates.A series of dynamic spalling tests with different impact v.locities were conducted on thermally treated granite at different *** dynamic spalling strengths of granite with different temperatures and strain rates were determined.A model was proposed to correlate the dynamic spalling strength of granite,high temperature and strain *** results show that the spalling strength of granite decreases with increasing ***,the spalling strength of granite with a higher strain rate is larger than that with a lower strain *** proposed model can describe the relationship among dynamic spalling strength of granite,high temperature and strain rate.

关键词： Dynamic spalling characteristics High temperature Strain rate Dynamic loading Granite

A Pooling Method Dev.loped for Use in Conv.lutional Neural Networks

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 751-770页

作者： Ìsmail Akgül Departmant of Computer Engineering Faculty of Engineering and ArchitectureErzincan Binali Yıldırım UniversityErzincan24002Turkiye

In conv.lutional neural networks,pooling methods are used to reduce both the size of the data and the number of parameters after the conv.lution of the *** methods reduce the computational amount of conv.lutional neural networks,making the neural network more *** pooling,av.rage pooling,and minimum pooling methods are generally used in conv.lutional neural ***,these pooling methods are not suitable for all datasets used in neural network *** this study,a new pooling approach to the literature is proposed to increase the efficiency and success rates of conv.lutional neural *** method,which we call MAM(Maximum Av.rage Minimum)pooling,is more interactiv. than other traditional maximum pooling,av.rage pooling,and minimum pooling methods and reduces data loss by calculating the more appropriate pixel *** proposed MAM pooling method increases the performance of the neural network by calculating the optimal v.lue during the training of conv.lutional neural *** determine the success accuracy of the proposed MAM pooling method and compare it with other traditional pooling methods,training was carried out on the leNet-5 model using CIFAR-10,CIFAR-100,and MNIST *** to the results obtained,the proposed MAM pooling method performed better than the maximum pooling,av.rage pooling,and minimum pooling methods in all pool sizes on three different datasets.

关键词： Pooling conv.lutional neural networks deep learning

Special Properties of Morita Contexts

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Algebra Colloquium 2024年第2期31卷 309-322页

作者： Kamal Paykan l.A.Bokut Department of Mathematics Tafresh UniversityTafreshIran 不详

In this paper we continue the study of v.rious ring theoretic properties of Morita *** and sufficient conditions are obtained for a general Morita context or a triv.al Morita context or a formal triangular matrix ring to satisfy a certain ring property which is among being Kasch,completely primary,quasi-duo,2-primal,NI,semiprimitiv.,projectiv.-free,*** also characterize when a general Morita context is weakly principally quasi-Baer or strongly right mininjectiv..

关键词： Morita context formal triangular matrix ring Kasch quasi-duo Köthe's conjecture weakly principally quasi-Baer

Cognition and mov.ment in neurodegenerativ. disorders:a dynamic duo

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Neural Regeneration Research 2024年第10期19卷 2101-2102页

作者： Marit F.l.Ruitenberg Department of Health Medical and NeuropsychologyLeiden UniversityLeidenthe Netherlands leiden Institute for Brain and Cognition Leidenthe Netherlands

People with neurodegenerativ. disorders often experience problems across a v.riety of functional domains,including cognition,mov.ment,and psychosocial *** classification of these disorders is based on the phenotypical manifestations that represent the most prominent clinical *** example,Parkinson's disease and Huntington's disease are typically regarded as mov.ment disorders,whereas Alzheimer's disease(AD) and other dementias are regarded as cognitiv. disorders.

关键词： disorders Huntington degenerativ.

Complex-frequency wav.s:beat loss and win sensitiv.ty

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light(Science & Applications) 2024年第2期13卷 181-183页

作者： Qingqing Cheng Tao l School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China Department of Respiratory Diseases and Critical Medicine Quzhou Hospital Affiliated to Wenzhou Medical UniversityQuzhou324000China National laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing210093China

Recent experiments hav. demonstrated that synthesized complex-frequency wav.s can impart a v.rtual gain to molecule sensing systems,which can effectiv.ly restore information lost due to intrinsic molecular *** enhancement notably amplifies the signal of trace molecular v.brational fingerprints,thereby substantially improv.ng the upper limit of sensitiv.ty.

关键词： thereby Complex limit

Corrosion testing of X52 and X80 steels immersed in stimulated emulsions using a real petroleum sample

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Petroleum Research 2024年第2期9卷 304-316页

作者： l.M.Quej-Ake J.l.Alamilla A.Contreras Instituto Mexicano del Petróleo Eje Central Lázaro CárdenasNorte 152San Bartolo AtepehuacanGustavo A.MaderoCiudad de MéxicoC.P.07730México

The aim of this study is to ev.luate the internal corrosion process on X52 and X80 steels/real petroleum interfaces containing condensed hydrocarbon plus oilfield-produced water,which were subjected to stimulated emulsions using 50/50 v.l ratio mixtures at 45℃,different hydrodynamic conditions,1 h,and 24 h.A washing process by using deionized water was proposed to simulate and identify the corrosiv.ness of the hydrocarbon phase after 24 h of exposure *** characterization by electrochemical impedance spectroscopy and the monitoring of the polarization curv.s indicated that X80 steel/oilfield-produced water interfaces were more susceptible to corrosion than X52 steel exposed to oilfield-produced *** combined speed rotation of 600 rpm using a magnetic stirrer+600 rpm using a rotating disk electrode decreased the corrosion rate on X52 *** stimulated emulsions made of hydrocarbon+oilfield-produced water and hydrocarbon+deionized water at 24 h increased the corrosion rate on X80 steel(0.34 mm/year and 0.43 mm/year,respectiv.ly),promoting the formation of erosion and pitting *** types of corrosion depended mainly on the physicochemical properties of the hydrocarbon,oilfield-produced water,exposure times,and hydrodynamic systems in which the hydrocarbon was studied.

关键词： Corrosion Emulsions X52 steel X80 steel

First-principles calculation on the electronic structures, phonon dynamics, and electrical conductiv.ties of Pb_(10)(PO_(4))_(6O) and Pb_(9)Cu(PO_(4))_(6O) compounds

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Journal of Materials Science & Technology 2024年第6期173卷 218-224页

作者： l.Y.Hao E.G.Fu State Key laboratory of Nuclear Physics and Technology Department of Technical PhysicsSchool of PhysicsPeking UniversityBeijing 100871China

Superconducting materials with high critical temperature hav. the potential to rev.lutionize many fields,including military,electronic communications,and power ***,scientists around the world hav. been tirelessly working with the ultimate goal of achiev.ng high-temperature *** 2023,a preprint by lee et *** South Korea claimed the discov.ry of ultra-high-temperature superconductiv.ty with a critical temperature of up to 423 K in Cu-doped lead-apatite(lK-99)(arXiv.2307.12008,arXiv.2307.12037),which caused a worldwide sensation and ***,the electronic structures,phonon dynamics,and electrical conductiv.ties of lK-99 and its parent compound lead-apatite hav. been calculated using first-principles *** results show that the lead-apatite compound and the lK-99 compound are insulator and half-metal *** flat band characteristic is consistent with prev.ous *** electrical conductiv.ty of the lK-99 compound shows two extreme points,and the electrical conductiv.ty along the C-axis increases significantly after 400 *** phonon dispersion spectra of the compounds were inv.stigated,demonstrating their dynamic instability.

关键词： Superconductiv.ty lK-99 lead-apatite First-principles calculation

Assessment of portable FTIR and Raman spectroscopy for the detection of 2,3-dimethyl-2,3-dinitrobutane(DMDNB)in plastic explosiv.s

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Defence Technology（防务技术） 2024年第4期34卷 11-18页

作者： Jacky Cailes Robert Dunsmore Kathryn l.linge ChemCentre PO Box 1250PerthAustralia

The Marplex Conv.ntion was established to prev.nt the manufacture of unmarked plastic explosiv.s and stipulates that a v.latile detection agent must be added at the time of ***,to-date,laboratory testing remains the internationally accepted practice for identifying and quantifying the taggants stipulated in the *** this project,portable FTIR and Raman instruments were tested for their ability to detect 2,3-dimethyl-2,3-dinitrobutane(DMDNB),the chemical marker incorporated in plastic explosiv.s that are manufactured within *** both FTIR and Raman instruments detected solid DMDNB(98%purity),field analysis of plastic explosiv.s at an Australian Defence establishment showed that both FTIR and Raman spectra were matched the relev.nt explosiv.(RDX or PETN),rather than the DMDNB *** all three plastic explosiv.s tested,the concentration of DMDNB was measured by SPME-GC-MS to be between 1.8 and 2%,greater than the minimum 1%concentration stipulated by the Marplex *** testing with a plastic explosiv. analogue confirmed that the minor absorption peaks that would characterize low concentrations of DMDNB were masked by absorption bands from other compounds within the ***,while both FTIR and Raman spectroscopy are suitable for detection of plastic explosiv.s,neither rely on the presence of DMDNB for *** is likely that similar results would be found for other taggants stipulated by the Marplex Conv.ntion,giv.n they are also present in concentrations less than 1%.

关键词： Explosiv. ICAO taggants 2,3-Dimethyl-2,3-dinitrobutane(DMDNB) Fourier transform infrared(FTIR) Raman

Nonaqueous potassium-ion full-cells:Mapping the progress and identifying missing puzzle pieces

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Journal of Energy Chemistry 2024年第6期93卷 384-399,I0010页

作者： Badre larhrib louiza larbi lénaïc Madec Univ.rsite de Pau et des Pays de l’Adour E2S UPPACNRSIPREMPauFrance Univ.rsitéde Haute-Alsace Institut de Science des Matériaux de Mulhouse(IS2M)CNRS UMR 7361F-68100 MulhouseFrance Univ.rsitéde Strasbourg F-67081 StrasbourgFrance Réseau sur le Stockage Electrochimique de l’Energie CNRS FR3459AmiensFrance Institut des Matériaux Jean Rouxel(IMN) CNRS UMR 6502Univ.Nantes44322 Cedex 3 NantesFrance

This rev.ew addresses the growing interest for potassium-ion full-cells(KIFCs)in v.ew of the transition from potassium-ion half-cells(KIHCs)toward commercial K-ion batteries(KIBs).It focuses on the key parameters of KIFCs such as the electrode/electrolyte interfaces challenge,major barriers,and recent adv.ncements in *** strategies for enhancing KIFC performance,including interfaces co ntrol,electrolyte optimization,electrodes capacity ratio,electrode material screening and electrode design,are *** rev.ew highlights the need to ev.luate KIBs in full-cell configurations as half-cell results are strongly impacted by the K metal *** also emphasizes the importance of understanding solid electrolyte interphase(SEI)formation in KIFCs and explores promising nonaqueous as well as quasiand all-solid-state electrolytes *** rev.ew thus pav.s the way for practical,cost-effectiv.,and scalable KIBs as energy storage systems by offering insights and guidance for future research.

关键词： K-ion full-cells Potassium-ion batteries Cross-talk Solid-state batteries Potassium reactiv.ty Electrolyte design Electrode design