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Identification of pulse-like ground motions using artificial neural network

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Earthquake Engineering and Engineering Vibration 2022年第4期21卷 899-912页

作者： Ahed habib Iman Youssefi Mehmet M.Kunt Department of Civil Engineering Eastern Mediterranean University99628 FamagustaNorth Cyprusvia Mersin 10Turkey

For more than 20 years,the concept of near-fault pulse-like ground motion has been a topic of great interest due to its distinct characteristics,particularly due to directivity or fling effects,which are hugely influenced by the rupture *** unexpected characteristics,along with their effective frequency,energy rate,and damage indices,create a near-fault,pulse-like ground motion capable of causing severe damage to *** of the most common approaches for identifying these ground motions is done by conducting wavelet decomposition of the ground motion time history to extract a pulse signal and eventually categorize an earthquake by comparing the original signal to the residual ***,to overcome the intensive calculations required in this approach,this study proposes using artificial neural networks to identify pulse-like ground motions through classification to predict their pulse period by means of regression ***,the study is intended to evaluate the reliability and accuracy of various artificial neural networks in identifying pulse-like ground motions and predicting their pulse *** general,the results of the study have shown that the artificial neural network can identify pulse-like earthquakes and reliably predict their pulse period.

关键词： pulse-like ground motions near-fault artificial neural network identification

Developing a Lagrangian sediment transport model for open channel flows

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International Journal of Sediment Research 2023年第2期38卷 153-165页

作者： Saman Baharvand habib Ahmari Poorya Taghvaei Department of Civil Engineering The University of Texas at Arlington Department of Civil Engineering Semnan University

A three-dimensional stochastic Lagrangian particle tracking sediment transport model is developed to solve the discrete advection-dispersion equation using a combination of empirical dispersion *** performance of three widely-used longitudinal dispersion coefficient equations was examined to select one of them as the primary dispersion equation term in the developed model. Also, a conditional empirical equation was used to consider the effect of vertical dispersion term in top layers near the water surface. The performance of particle tracking model(PTM) to calculate the sediment concentration was evaluated for various sediment classes(very fine sand, fine sand, and medium sand) using available laboratory dataset. Multiple statistical measures were calculated using the Taylor diagram for each dispersion equation. Based on the result, the developed particle tracking model estimated the suspended sediment concentration in a rectangular open channel with a correlation coefficient(R) of 0.96, standard deviation(STD) of 0.262, and root mean square deviation(RMSD) of 0.06 for three different sediment classes proving the acceptable accuracy of the developed model for different range of sediment gradations. In addition, the accuracy of PTM was compared to recently developed models. Comparison between the particle tracking model and the analytical solution of the advection-dispersion equation showed that the developed model predicted the maximum concentration of suspended sediment 6% and9.4% lower than the analytical solution result for 30 and 50 s simulation time in the straight channel,respectively. However, there was a good agreement between the longitudinal and transverse sediment concentration distribution from the model and the analytical solution approach. The result of the sensitivity analysis and validation process showed that the model could be used to simulate sediment transport in open channel flows.

关键词： Sediment transport Lagrangian particle tracking Stochastic approach Advection–dispersion Random walk

Methodology for the estimation of expansive cement borehole pressure

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International Journal of Mining Science and Technology 2023年第1期33卷 73-81页

作者： Kelly-Meriam habib Isaac Vennes Hani S.Mitri Department of Mining and Materials Engineering McGill UniversityMontreal H3A 0E8Canada

This work is part of a multi-phase project which aims to develop a sound methodology for rock fragmen-tation in underground mines using expansive *** specifically,it is the first phase of the project which focuses on laboratory tests to investigate the mechanical performance of expansive cement,also known as soundless chemical demolition agents(SCDA).This paper reports the results of laboratory tests conducted on instrumented thick-walled cylinders filled with expansive *** pressure evo-lution and temperature variation with time are first examined for different borehole *** clas-sical analytical method for expansive pressure estimation is validated with direct pressure measurement using high-capacity pressure sensor,and an empirical model is obtained.A new methodology based on iterative procedure is developed using axisymmetric finite element modelling and test results to derive the modulus of elasticity of the expansive cement at peak *** results of this study show that the expansive pressure increases with borehole diameter when the rigidity of the steel cylinder is constant reaching 83 MPa for a 38.1 mm *** is also shown that the expansive pressure decreases signif-icantly with increased cylinder rigidity for the same borehole *** newly developed methodol-ogy revealed that the modulus of elasticity of expansive cement at peak pressure is estimated at 8.2 GPa.A discussion on the extension of the findings of this work to hard rock mining applications is presented.

关键词： Rock fragmentation Soundless chemicaldemolitionagents Expansive cement

Laboratory investigation into the use of soundless chemical demolitions agents for the breakage of hard rock

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International Journal of Coal Science & Technology 2022年第5期9卷 71-80页

作者： Kelly‑Meriam habib Isaac Vennes Hani Mitri Department of Mining and Material Engineering McGill UniversityMontrealCanada

The method of drilling and blasting with explosives is widely used in rock fragmentation applications in the mining industry for mine development and ore ***,the use of explosives is associated with rigorous safety and environmental constraints as blasting creates toxic fumes,ground vibrations,and *** study is focused on the use of Soundless Chemical Demolition Agents(SCDA)as a more environmentally friendly method for rock breakage and a potential replacement of *** this paper,the results of a series of experimental tests are reported to identify the efect of SCDA on hard rock breakage under no load and under uniaxial loading *** granite prismatic specimens of 152.4 mm(6″)×152.4–203.2 mm(6–8″)×406.4 mm(16″)are used to test the infuence of borehole size on the time to fracturing with SCDA borehole size of 25.4 mm(1″),31.75 mm(1.25″)and 38.1 mm(1.5″).It is shown that the fracturing time decreases with increasing borehole *** is also shown that specimens subjected to uniaxial compression of 5 MPa fracture as early as 7 h after SCDA mixing.A borehole spacing to borehole diameter ratio of 12.8 to 14.6 is suggested for practical applications.

关键词： Explosive-free Hard rock fragmentation Soundless chemical demolition agents Uniaxial loading

A Decision-Based Hybrid Proxy Mobile IPv6 Scheme for Better Resources Utilization

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Computers, Materials & Continua 2022年第12期73卷 5151-5167页

作者： habib Ullah Khan Anwar Hussain Shah Nazir Department of Accounting and Information Systems College of Business and Economics Qatar UniversityDohaQatar Department of Computer Science University of SwabiAnbarKPPakistan

Seamless mobility is always one of the major requirements of modern-day *** a heterogeneous and massive IoT environment,efficient network-based mobility protocol such as proxy mobile IPv6(PMIPv6),is potentially a good candidate for efficient mobility as well as resource utilization *** extensions are devised for performance in the research ***,a multi-criterion decision-based resourceefficient PMIPv6 extension is required to achieve efficiency when network resources are *** this research,a multi-criterion decision-based PMIPv6 scheme is devised that provides better performance when the Local Mobility Anchor(LMA)or Mobile Access Gateway(MAG)is *** objective is achieved by monitoring the load status of MAG or LMA and based on their status,the proposed scheme adapts itself to provide seamless mobility in addition to optimal *** proposed scheme is compared with the existing LMA and MAG-based mobility management protocol *** on the analysis of the comparison,the obtained results prove that providing a decision-based PMIPv6 scheme is better for service continuity as well as optimal performance in the context of required buffering,handover efficiency,and necessary signaling cost.

关键词： Proxy mobile IPv6 LMA MAG load balancing location-based PMIPv6

Modeling Fast Diffusion Processes in Time Integration of Stiff Stochastic Differential Equations

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Communications on Applied Mathematics and Computation 2022年第4期4卷 1457-1493页

作者： Xiaoying Han habib N.Najm Department of Mathematics and Statistics Auburn University221 Parker HallAuburnAL 36849USA Sandia National Laboratories P.O.Box 969LivermoreCA 94551USA

Numerical algorithms for stiff stochastic differential equations are developed using lin-ear approximations of the fast diffusion processes,under the assumption of decoupling between fast and slow *** numerical schemes are proposed,all of which are based on the linearized formulation albeit with different degrees of *** schemes are of comparable complexity to the classical explicit Euler-Maruyama scheme but can achieve better accuracy at larger time steps in stiff *** analysis is conducted for one of the schemes,that shows it to have a strong convergence order of 1/2 and a weak convergence order of *** arriving at the other two schemes are *** experiments are carried out to examine the convergence of the schemes proposed on model problems.

关键词： Stiff stochastic differential equation Fast diffusion Linear diffusion approximation Mean-square convergence Weak convergence

Comparative Analysis of Pythagorean MCDM Methods for the Risk Assessment of Childhood Cancer

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2585-2615页

作者： Shaista habib Muhammad Akram MMAli Al-Shamiri School of Systems and Technology University of Management and TechnologyLahorePakistan Department of Mathematics University of the PunjabNew CampusLahorePakistan Department of Mathematics Faculty of Science and ArtsMahayl AssirKing Khalid UniversityAbhaSaudi Arabia

According to the World Health Organization(WHO),cancer is the leading cause of death for children in low and middle-income *** 400,000 kids get diagnosed with this illness each year,and their survival rate depends on the country in which they *** this article,we present a Pythagorean fuzzy model that may help doctors identify the most likely type of cancer in children at an early stage by taking into account the symptoms of different types of *** Pythagorean fuzzy decision-making techniques that we utilize are Pythagorean Fuzzy TOPSIS,Pythagorean Fuzzy Entropy(PF-Entropy),and Pythagorean Fuzzy PowerWeighted Geometric(PFPWG).Ourmodel is fed with nineteen symptoms and it diagnoses the risk of eight types of cancers in *** develop an algorithm for each method and calculate its ***,we consider an example to make a clear understanding of our *** also compare the final results of various tests that prove the authenticity of this study.

关键词： Risk assessment Pythagorean fuzzy sets TOPSIS method entropy power weighted geometric operators

Improvement in piezoelectric performance of the lead-free BiFeO_(3)-BaTiO_(3) ceramics by synergistic approach

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Journal of Materials Science & Technology 2023年第29期160卷 55-65页

作者： Muhammad habib Lin Tang Guoliang Xue Xuefan Zhou Dou Zhang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

High-piezoelectric properties in lead-free materials have been the pursuit for both industry and scientific *** this work,the synergistic approaches of phase/domain engineering and novel poling method are adopted for the improvement of piezoelectric *** strategically designed lead-free donor-doped BiFeO_(3)-x BaTiO_(3) ceramics at the crystal structure morphotropic phase boundary(MPB)between the rhombohedral and tetragonal phases exhibited a high Curie temperature(T C≥450°C).Furthermore,si-multaneously enhanced static piezoelectric constant(d_(33))of 436±5 pC/N and thermally stable dynamic piezoelectric constant(d_(33)^(∗))of 550±10 pm/V were *** high piezoelectric performance is col-lectively attributed to the crystal structure MPB,thermal quenching effect,local structure heterogeneity induced by donor doping,mesoscale nanodomains,and novel poling method inside a magnetic *** temperature-insensitive and high piezoelectric performance of the current work is superior to the other lead-free *** synergistic approach for the improvement of piezoelectricity provides a path for the development of lead-free ceramics for high-temperature commercial applications.

关键词： Lead-free piezoceramics BiFeO_(3)-BaTiO_(3) Quenching Temperature-insensitive AC-poling

Outpatient insulin use in type 2 diabetes mellitus and acute respiratory distress syndrome outcomes:A retrospective cohort study

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World Journal of Clinical Cases 2024年第17期12卷 2966-2975页

作者： Georges Khattar Samer Asmar Laurence Aoun Fares Saliba Shaza Almardini Saif Abu Baker Catherine Hong Carolla El Chamieh Fadi Haddadin Toni habib Omar Mourad Zeina Morcos Fatema Arafa Jonathan Mina Khalil El Gharib Mohammad Aldalahmeh Salman Khan Elie Bou Sanayeh Department of Medicine Holy Spirit University of KaslikJounieh 00000Lebanon Department of Internal Medicine Staten Island University HospitalStaten IslandNY 10305United States Public Heath and Biostatistics Independent ResearchBeirut 0000Lebanon Department of Medicine Lebanese UniversityBeirut 00000Lebanon Department of Medicine University of BalamandBeirut 00000Lebanon Department of Medicine Lebanese American UniversityBeirut 00000Lebanon Department of Medicine Northwell Health Staten Island University HospitalNew YorkNY 10305United States

BACKGROUND The impact of type 2 diabetes mellitus(T2DM)on acute respiratory distress syndrome(ARDS)is debatable.T2DM was suspected to reduce the risk and complications of ***,during coronavirus disease 2019(COVID-19),T2DM predisposed patients to ARDS,especially those who were on insulin at *** evaluate the impact of outpatient insulin use in T2DM patients on non-COVID-19 ARDS *** We conducted a retrospective cohort analysis using the Nationwide Inpatient Sample *** patients diagnosed with ARDS were stratified into insulin-dependent diabetes mellitus(DM)(IDDM)and non-insulindependent DM(NIDDM)*** applying exclusion criteria and matching over 20 variables,we compared cohorts for mortality,duration of mechanical ventilation,incidence of acute kidney injury(AKI),length of stay(LOS),hospitalization costs,and other clinical *** Following 1:1 propensity score matching,the analysis included 274 patients in each ***,no statistically significant differences emerged between the IDDM and NIDDM groups in terms of mortality rates(32.8%vs 31.0%,P=0.520),median hospital LOS(10 d,P=0.537),requirement for mechanical ventilation,incidence rates of sepsis,pneumonia or AKI,median total hospitalization costs,or patient disposition upon *** Compared to alternative anti-diabetic medications,outpatient insulin treatment does not appear to exert an independent influence on in-hospital morbidity or mortality in diabetic patients with non-COVID-19 ARDS.

关键词： Acute respiratory distress syndrome Type 2 diabetes mellitus Insulin Length of stay Mortality Endotracheal intubation Acute kidney injury Coronavirus disease 2019