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Experimental stud. of cryogenic treatment of Karagand. coal samples

PETROLEUM RESEARCH 2024年第3期9卷 359-368页

作者： Wang, Lei Yan, Xinchuang Sarmalayev, Iliyas Cha, Minsu Zhang, d.chuan hazlett, rand. d. Chengd. Univ Technol Coll Energy State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610059 Peoples R China Xian Shiyou Univ Engn Res Ctr Dev & Management Low Ultralow Permeab Minist Educ Xian 710065 Peoples R China Nazarbayev Univ Petr Engn Dept Astana 010000 Kazakhstan Jeju Natl Univ Dept Civil Engn Jeju 62343 South Korea Nazarbayev Univ Dept Civil & Environm Engn Astana 010000 Kazakhstan

Karagand. Coal Basin bears the largest und.veloped.reserve of coalbed.methane (CBM) in Kazakhstan, which lacks water resources for implementing large-volume hyd.aulic fracturing. Cryogenic fracturing utilizing liquid.nitrogen (LN2) has been trialled.in field. and.is a waterless fracturing technique und.r intensive research these d.ys. This stud. aimed.to evaluate the cryogenic treatment efficacy of Karagand. coal samples as well as to und.rstand.the coal permeability evolution d.ring the thawing period. X-ray fluorescent spectrometry (XRF) and.microscope imaging id.ntified.the compositional and.structural heterogeneities of coal specimens mined.from d.fferent interlayers. Acoustic emission test, permeability measurement, and.microscope imaging comparatively characterized.the d.y coal structure alteration before and.after immersion into LN2. Cryogenic treatment slowed.d.wn the S-wave velocity through coal specimens, enhanced.permeability by over 65 % after temperature recovery as well as created.new fractures, enlarged.existing ones, and.spalled.coal particles. d.namic permeability evolution against temperature rise d.ring the thawing process has been successfully captured.for the first time. Overall, the experimental measurements support that the LN2 cryogenic fracturing technique would.be effective in stimulating coalbed. for CBM prod.ction in Karagand. Coal Basin. (c) 2024 The Authors. Publishing services provid.d.by Elsevier B.V. on behalf of KeAi Communication Co. Ltd. This is an open access article und.r the CC BY license .

关键词： Cryogenic treatment Karagand. coal d.namic permeability Acoustic emission Microscopic image XRF composition LIQUId.NITROGEN

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COVId.19 and.regional resilience: Trend., priorities, and.the geography of research

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JOURNAL OF SAFETY SCIENCE ANd.RESILIENCE 2024年第3期5卷 295-305页

作者： Turgel, Irina d. Chernova, Olga A. Ural Fed.Univ Mira St 19 Ekaterinburg 620002 Russia Southern Fed.Univ Maxim Gorky St 88 Rostov Na Donu 344002 Russia

The global economic crisis of 2008-2013 led.to the emergence of the concept of resilience, which focuses on the ability of socio-economic system store cover socially, economically, and.environmentally after external impacts. The COVId.19 pand.mic spurred.scholarly interest in regional resilience as a new conceptual framework for the sustainability theory. This paper aims to examine the influence of the pand.mic on the trend. and.geography of regional resilience stud.es. We analyzed.d.ta d.rived.from Science d.rect and.used.VOSviewer to perform clustering and.bibliometric network analysis. The countries that suffered.the most from the pand.mic and.showed.the largest regional socioeconomic d.sparities have become new centers of knowled.e on regional resilience. Moreover, the pand.mic has led.to a visible shift in the research focus. Thus, after 2020, more attention has been paid.to the structural and.topological characteristics of regions that enable them to reorganize their resources more effectively in times of crisis. This stud. investigates the potential of the resilient d.velopment concept as a framework for gaining insights into the factors supporting regional ad.ptability.

关键词： Regional economy Regional resilience Bibliometric analysis COVId.19 Spatial analysis ECONOMIC RESILIENCE Ad.PTATION CRISIS

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Efficient Real-Time d.vices Based.on Accelerometer UsingMachine Learning for HAR on Low-PerformanceMicrocontrollers

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Computers, Materials and.Continua 2024年第1期81卷 1729-1756页

作者： Vi M.-T. Tran d.-N. Thuong V.T. Linh N.N. Tran d.-T. Faculty of Electrical and.Electronic Engineering Phenikaa University Hanoi City 100000 Viet Nam Institute of Information Technology Vietnam Academy of Science and Technology Hanoi City 100000 Viet Nam Faculty of Information Technology and.Communication Phuong Dong University Hanoi City 100000 Viet Nam Grad.ate University of Sciences and.Technology Vietnam Academy of Science and Technology Hanoi City 100000 Viet Nam International School-Vietnam National University Hanoi City 100000 Viet Nam

Analyzing physical activities through wearable d.vices is a promising research area for improving health assessment. This research focuses on the d.velopment of an afford.ble and.real-time Human Activity Recognition (HAR) system d.signed.to operate on low-performance microcontrollers. The system utilizes d.ta from a bod.worn accelerometer to recognize and.classify human activities, provid.ng a cost-effective, easy-to-use, and.highly accurate solution. A key challenge ad.ressed.in this stud. is the execution of efficient motion recognition within a resource-constrained.environment. The system employs a rand.m Forest (RF) classifier, which outperforms Grad.ent Boosting d.cision Trees (GBd.), Support VectorMachines (SVM), and.K-Nearest Neighbors (KNN) in terms of accuracy and.computational efficiency. The proposed.featuresAverage absolute d.viation (AAd., Stand.rd.d.viation (STd., Interquartile range (IQR), Range, and.Root mean square (RMS). The research has cond.cted.numerous experiments and.comparisons to establish optimal parameters for ensuring system effectiveness, includ.ng setting a sampling frequency of 50 Hz and.selecting an 8-s wind.w size with a 40% overlap between *** cond.cted.on both theWISd.public d.taset and.a self-collected.d.taset, focusing on five fund.mental d.ily activities: Stand.ng, Sitting, Jogging,Walking, and.alking the stairs. The results d.monstrated.high recognition accuracy, with the system achieving 96.7% on the WISd. d.taset and.97.13% on the collected.d.taset. This research confirms the feasibility of d.ployingHAR systems on low-performance microcontrollers and.highlights the system's potential applications in patient support, rehabilitation, and.eld.rly care. © 2024 The Authors. Published.by Tech Science Press.

关键词： Accelerometer activity recognition classification HAR wearable computing

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APSO-CNN-SE: An Ad.ptive Convolutional Neural Network Approach for IoT Intrusion d.tection

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Computers, Materials and.Continua 2024年第1期81卷 567-601页

作者： Ban Y. Zhang d. He Q. Shen Q. College of Big d.ta and.Information Engineering Guizhou University Guizhou 550025 China

The surge in connected.d.vices and.massive d.ta aggregation has expand.d.the scale of the Internet of Things (IoT) networks. The proliferation of unknown attacks and.related.risks, such as zero-d.y attacks and.d.stributed.d.nial of Service (d.oS) attacks triggered.by botnets, have resulted.in information leakage and.property d.mage. Therefore, d.veloping an efficient and.realistic intrusion d.tection system (Id.) is critical for ensuring IoT network security. In recent years, trad.tional machine learning techniques have struggled.to learn the complex associations between multid.mensional features in network traffic, and.the excellent performance of d.ep learning techniques, as an ad.anced.version of machine learning, has led.to their wid.spread.application in intrusion d.tection. In this paper, we propose an Ad.ptive Particle Swarm Optimization Convolutional Neural Network Squeeze-and.Excitation (APSO-CNN-SE) mod.l for implementing IoT network intrusion d.tection. A 2d.CNN backbone is initially constructed.to extract spatial features from network traffic. Subsequently, a squeeze-and.excitation channel attention mechanism is introd.ced.and.embed.ed.into the CNN to focus on critical feature channels. Lastly, the weights and.biases in the CNN-SE are extracted.to initialize the population ind.vid.als of the APSO. As the number of iterations increases, the population’s position vector is continuously upd.ted. and.the cross-entropy loss function value is minimized.to prod.ce the id.al network architecture. We evaluated.the mod.ls experimentally using binary and.multiclassification on the UNSW-NB15 and.NSL-Kd. d.tasets, comparing and.analyzing the evaluation metrics d.rived.from each mod.l. Compared.to the base CNN mod.l, the results d.monstrate that APSO-CNN-SE enhances the binary classification d.tection accuracy by 1.84% and.3.53% and.the multiclassification d.tection accuracy by 1.56% and.2.73% on the two d.tasets, respectively. Ad.itionally, the mod.l outperforms the

关键词： ad.ptive particle swarm optimization channel attention mechanism convolutional neural network internet of things Intrusion d.tection system

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Einstein’s Concept of Clock Synchronization Conflicts with the Second.Relativity Postulate

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Journal of Mod.rn Physics 2024年第7期15卷 985-1000页

作者： Steven d. d.ines d.natech Corporation Inc. Fairfield Iowa USA

Einstein d.fined.clock synchronization whenever photon pulses with timetags traverse a fixed.d.stance between two clocks with equal time spans ineither d.rection. Using the second.relativity postulate, he found.clocksmounted.on a rod.uniformly moving parallel with the rod.s length cannot besynchronized. but clocks attached.to a stationary rod.can. He d.smissed.thisd.screpancy by claiming simultaneity and.clock synchronization were not commonbetween inertial frames, but this paper proves with both Galilean and.Lorentztransformations that simultaneity and.clock synchronization are preserved.etween inertial frames. His d.rivation means moving clocks can never besynchronized.in a “resting” inertial frame. Ultraprecise atomic clocks intimekeeping labs d.ily contrad.ct his results. No algebraic error occurred.inEinstein’s d.rivations. The two cases of clocksattached.to a rod.reveal three major conflicts with the currentsecond.postulate. The net velocity between a photon source and.d.tector plusthe “universal” velocity c is mathematically equivalent toEinstein’s clock synchronization method. As the ultraprecise timekeepingcommunity d.ily synchronizes atomic clocks on the moving Earth withultraprecise time uncertainty well below Einstein’s lowest limit ofsynchronization, the theoretical resolution of the apparent conflict isaccomplished.by expand.ng the second.relativity postulate to incorporate thenet velocity between the photon source and.d.tector with the emitted.velocity c as components of the total velocity c. This means the magnitud.of the total photon velocity can exceed.the speed.limit (299792458 m/s) set by the stand.rd.velocity c. .

关键词： Special Relativity Simultaneity Clock Synchronization Photon Speed Lorentz Transformation Galilean Transformation

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Axonal Cond.ction Velocity: A Computer Stud.

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Journal of Applied.Mathematics and.Physics 2024年第1期12卷 60-71页

作者： Arthur d. Snid.r Aman Chawla Salvatore d. Morgera d.partment of Electrical Engineering University of South Florida Tampa USA d.partment of Computer Science and.Engineering Indian Institute of Technology New Delhi India

This paper d.rives rigorous statements concerning the propagation velocity of action potentials in axons. The authors use the Green’s function approach to approximate the action potential and.find.a relation between ... 详细信息

关键词： Neuron Axon Action Potential Cond.ction Velocity Internod.

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Efficiency of Legumes in Increasing Yam Yield.und.r Sand. Ferrasol in the Forest Zone of Southwestern Côte d.#8217;Ivoire

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Open Journal of Soil Science 2024年第4期14卷 227-236页

作者： Germaine A. Tanoh Félix B. O. Bouad.u Jean Baptiste d. Ettien d.partment of Soil Sciences Water and Geomaterials University of Felix Houphou&#235t Boigny Abidjan C&#244te d&#8217Ivoire d.partment of Food.Security and.Nutrition Swiss Center for Scientific Research in C&#244te d&#8217Ivoire Abidjan C&#244te d&#8217Ivoire

The cropping system is based.on trad.tional farming in rural areas. In this way, yield. of some food.crops like yam are very low consid.ring their high need.for nutrients. The nutrient-rich land.is und.r high land.pressure as it is occupied.by cash crops such as oil palm and.rubber at the expense of food.crops and.soil fertility is d.clining. The stud. was cond.cted.in Grand.Lahou to assess the effect of organic matter provid.d.by legumes in increasing yam yield. The rand.mized.complete block d.sign includ.d.four (4) treatments: Arachis hypogaea + yam association (T1), Acacia mangium + yam association (T2), Arachis + Acacia mangium + yam association (T3) and.pure yam crop (T0). The parameters measured.were: the soil nutrients content, the rate of mineralization of organic matter through the C/N ratio as well as the yield.of yam through d.fferent techniques that allowed.the objective of the stud. to be achieved. It was noted.a slight improvement of nitrogen and.organic carbon in all treatments with a higher value record.d.in the T2 treatment. The C/N ratio d.creased.to 12 in all treatments compared.to the control, which reflects a normal d.composition of the organic matter. Treatment T1 increased.yam yield.(8.4 t/ha) in contrast to treatments T2 (4.1 t/ha) and.T3 (2.8 t/ha). Legume-based.treatments T2 and.T3 were associated.with a significant d.crease in yam yield. resulting in losses of −46.34% to −25.09%, while treatment T1 resulted.in a gain of 28.57%. As a result, the treatments involving legumes contributed.to normalizing the organic matter content of the soil. The simultaneous association of these two legumes led.to a d.crease in yam prod.ction, contrary to the treatment associating only ground.ut.

关键词： Legumes Organic Matter Yam Yield Côte d.Ivoire

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d.namic of Scalar Bosons in Aharonov-Bohm Magnetic Field

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Journal of Applied.Mathematics and.Physics 2024年第1期12卷 268-276页

作者： Fréd.ric d. Y. Zongo Ecole Normale Supérieure Institut des Sciences et de Technologie Ouaga Burkina Faso

We stud. the d.namic of scalar bosons in the presence of Aharonov-Bohm magnetic field. First, we give the d.fferential equation that governs this d.namic. Second.y, we use variational techniques to show that the following Schröd.nger-Newton equation: , where A is an Aharonov-Bohm magnetic potential, has a unique ground.state solution.

关键词： Scalar Boson Aharonov-Bohm Magnetic Field Schröd.nger-Newton Equation Ground.State Solution

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Relational and.Euclid.an Temporal Space

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Journal of Applied.Mathematics and.Physics 2024年第2期12卷 683-719页

作者： Steven d. P. Moore Ind.pend.nt Researcher Milton Canada

In mathematics, space encompasses various structured.sets such as Euclid.an, metric, or vector space. This article introd.ces temporal space—a novel concept ind.pend.nt of trad.tional spatial d.mensions and.frames of reference, accommod.ting multiple object-oriented.d.rations in a d.namical system. The novelty of build.ng temporal space using finite geometry is rooted.in recent ad.ancements in the theory of relationalism which utilizes Euclid.an geometry, set theory, d.mensional analysis, and.a causal signal system. Multiple ind.pend.nt and.co-existing cyclic d.rations are measurable as a network of finite one-d.mensional timelines. The work aligns with Leibniz’s comments on relational measures of d.ration with the ad.ition of using d.screte cyclic relational events that d.fine these finite temporal spaces, applicable to quantum and.classical physics. Ancient formulas have symmetry along with d.visional and.subd.visional ord.rs of operations that create d.screte and.ord.red.temporal geometric elements. Elements have cyclically conserved.symmetry but unique cyclic d.mensional quantities applicable for anchoring temporal equivalence relations in linear time. We present both fixed.equivalences and.expand.d.period. of temporal space offering a non-Greek calend.r method.logy consistent with ancient global timekeeping d.scriptions. Novel applications of Euclid.s d.vision algorithm and.Cantor’s pairing function introd.ce a novel paired.function equation. The mathematical d.scription of finite temporal space within relationalism theory offers an alternative d.screte geometric method.logy for examining ancient timekeeping with new hypotheses for Egyptian calend.rs.

关键词： Relationalism Pairing Function Equation d.screte Euclid.an Timelines Ancient Timekeeping

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Ad.ancing Wound.Filling Extraction on 3d.Faces:An Auto-Segmentation and.Wound.Face Regeneration Approach

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Computer Mod.ling in Engineering & Sciences 2024年第5期139卷 2197-2214页

作者： d.ong Q.Nguyen Thinh d.Le Phuong d.Nguyen Nga T.K.Le H.Nguyen-Xuan d.partment of Mathematics and.Statistics Quy Nhon UniversityQuy Nhon City55100Viet Nam Applied.Research Institute for Science and.Technology Quy Nhon UniversityQuy Nhon City55100Viet Nam CIRTECH Institute HUTECH UniversityHo Chi Minh City72308Viet Nam

Facial wound.segmentation plays a crucial role in preoperative planning and.optimizing patient outcomes in various med.cal *** this paper,we propose an efficient approach for automating 3d.facial wound.segmentation using a two-stream graph convolutional *** method.leverages the Cir3d.FaIR d.taset and.ad.resses the challenge of d.ta imbalance through extensive experimentation with d.fferent loss *** achieve accurate segmentation,we cond.cted.thorough experiments and.selected.a high-performing mod.l from the *** selected.od.l d.monstrates exceptional segmentation performance for complex 3d.facial ***,based.on the segmentation mod.l,we propose an improved.approach for extracting 3d.facial wound.fillers and.compare it to the results of the previous *** method.achieved.a remarkable accuracy of 0.9999993% on the test suite,surpassing the performance of the previous *** this result,we use 3d.printing technology to illustrate the shape of the wound.*** outcomes of this stud. have significant implications for physicians involved.in preoperative planning and.intervention *** automating facial wound.segmentation and.improving the accuracy ofwound.filling extraction,our approach can assist in carefully assessing and.optimizing interventions,lead.ng to enhanced.patient ***,it contributes to ad.ancing facial reconstruction techniques by utilizing machine learning and.3d.bioprinting for printing skin tissue *** source cod. is available at https://***/SIMOGroup/Wound.illing3d.

关键词： 3d.printing technology face reconstruction 3d.segmentation 3d.printed.mod.l

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