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Phase-plane analysis of test particle orbits in regular black holes

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Communications in Theoretical Physics 2020年第1期72卷 111-117页

作者： muhammed Amir Astrophysics and Cosmology Research Unit School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa

We investigate phase-plane analysis of general relativistic orbits in a gravitational field of the Reissner–Nordstr?m-type regular black hole *** employ phase-plane analysis to obtain different phase-plane diagrams of the test particle orbits by varying charge q and dimensionless parameterβ,whereβcontains angular momentum of the test *** compute numerical values of radii for the innermost stable orbits and corresponding values of energy required to place the test particle in *** on,we employ similar analysis on an Ayón–beato–García(AbG)regular black hole and a comparison regarding key results is also included.

关键词： black holes modified gravity phase-plane diagrams

Expanding role of antibodies in kidney transplantation

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World Journal of Transplantation 2025年第1期15卷 57-71页

作者： Khawar Abbas muhammed Mubarak Department of Transplant Immunology Sindh Institute of Urology&TransplantationKarachi 74200SindhPakistan Javed I.Kazi Department of Histopathology Sindh Institute of Urology&TransplantationKarachi 74200SindhPakistan

The role of antibodies in kidney transplant(KT)has evolved significantly over the past few *** role of antibodies in KT is multifaceted,encompassing both the challenges they pose in terms of antibody-mediated rejection(AMR)and the opportunities for improving transplant outcomes through better detection,prevention,and treatment *** our understanding of the immunological mechanisms continues to evolve,so too will the approaches to managing and harnessing the power of antibodies in KT,ultimately leading to improved patient and graft *** narrative review explores the multifaceted roles of antibodies in KT,including their involvement in rejection mechanisms,advancements in desensitization protocols,AMR treatments,and their potential role in monitoring and improving graft survival.

关键词： Antibodies Humoral theory Kidney transplantation Rejection

Rule based Collector Station Selection Scheme for Lossless Data Transmission in Underground Sensor Networks

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China Communications 2019年第12期16卷 72-83页

作者： muhammed Enes bayrakdar Computer Engineering Department Duzce University

There are fundamentally two different communication media in wireless underground sensor networks. The first of these is a solid medium where the sensor nodes are buried underground and wirelessly transmit data from underground to aboveground. The second is an underground medium such as tunnel, cave etc. and the data is transmitted from underground to the aboveground through partially solid medium. The quality of communication is greatly influenced by the humidity of the soil in both environments. The placement of wireless underground sensor nodes at hard-to-reach locations makes energy efficient work compulsory. In this paper, rule based collector station selection scheme is proposed for lossless data transmission in underground sensor networks. In order for sensor nodes to transmit energy-efficient lossless data, rulebased selection operations are carried out with the help of fuzzy logic. The proposed wireless underground sensor network is simulated using Riverbed software, and fuzzy logic-based selection scheme is implemented utilizing Matlab software. In order to evaluate the performance of the sensor network;the parameters of delay, throughput and energy consumption are investigated. Examining performance evaluation results, it is seen that average delay and maximum throughput are accomplished in the proposed underground sensor network. Under these conditions, it has been shown that the most appropriate collector station selection decision is made with the aim of minimizing energy consumption.

关键词： sensor network fuzzy rule based underground collector station

Direct use of peak ground motion parameters for the estimation of inelastic displacement ratio of SDOF systems subjected to repeated far fault ground motions

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 771-785页

作者： Cengizhan Durucan muhammed Gümüs Department of Civil Engineering (Technology Faculty) Flrat University Elazig 23270 Turkey Department of Civil Engineering Gazi University Ankara 06370 Turkey

This study is aimed at developing statistical equations to estimate the inelastic displacement ratio of singledegree-of-freedom systems subjected to far fault repeated earthquakes. In the study, peak ground motion parameters are used to define the scatter of the original data. The ratio of peak ground acceleration to peak ground velocity, and peak ground velocity of the ground motion records and structural parameters such as period of vibration and lateral strength ratio are used in the proposed equations. For the development of the equations, nonlinear time history analyses of single-degree-offreedom systems are conducted. Then, the results are used in a multivariate regression procedure. The equations are verified by comparing the estimated results with the calculated results. The average error and coefficient of variation of the proposed equations are presented. The analyses results revealed that the direct use of peak ground motion parameters for the estimation of inelastic displacement ratio significantly reduced the scatter in the original data and yielded accurate results. From the comparative results it is also observed that results obtained using equations specific to peak ground velocity or peak ground acceleration to peak ground velocity ratio are similar.

关键词： C1 peak ground velocity peak ground acceleration far fault ground motions sequential ground motions

Underground blast effects on structural pounding

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Earthquake Engineering and Engineering Vibration 2022年第3期21卷 617-639页

作者： muhammed Zain Kangda Nilesh Mate Sachin bakre School of Civil Engineering REVA UniversityBengaluru 560064India Amrutvahini College of Engineering SangamnerAhmednagar 422608India Department of Applied Mechanics Visvesvaraya National Institute of TechnologyNagpur 440010India

In the present study,actual three-dimensional structures are converted into a stick model of multi degree of-freedom(MDOF)systems for understanding the macro-behavior of *** study investigates the performance of three closely spaced,adjacent G+10,fixed-base MDOF systems with the mass aligned at the same levels and subjected to accidental underground blast *** acceleration time history of underground blast loading is generated based on past empirical *** blast charge weight varies from 10 to 75 t while keeping the charge distance constant(R=100 m).The entire formulation is solved with the MATLAb solver,using the state space form *** cases are considered,based on changing the position of the three stick *** first case considered left building rigid,middle building moderate rigid,and right building *** second assumed left building flexible,middle building rigid,and right building moderate *** third examined the left building as moderate rigid,the middle building as flexible,and the right building *** analysis of the results shows that the arrangement with low stiffness,high stiffness,and moderately stiff buildings placed to the left,middle,and right side,respectively,yields minimum structural response when compared to the other two combinations.

关键词： structural pounding building positions MDOF stick system stiffness factor blast ground motion

Implementation of serverless cloud GIS platform for land valuation

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International Journal of Digital Earth 2021年第7期14卷 836-850页

作者： muhammed Oguzhan Mete Tahsin Yomralioglu Geomatics Engineering Department Istanbul Technical UniversityIstanbulTurkey

Cloud computing enables performing computations and analysis tasks and sharing services in web-based computer centres instead of local desktop *** of the most used areas of cloud computing is geographic information systems(GIS)*** Desktop GIS products are still used in the community frequently,Web GIS and Cloud GIS applications have drawn attention and have become more efficient for *** this study,a serverless Cloud GIS framework is implemented for the land valuation *** order to store,analyse,and share geospatial data,the Aurora Serverless PostgreSQL database is created on Amazon Web Services(AWS).While adopting Aurora Serverless PostgreSQL as a database management system,a simple point in polygon analysis conducted to compare the performances with Amazon Relational Database Service(RDS)*** showed that the serverless database responded to the query faster and scaled up during high workload to decrease ***,parcel vector data,which conveys ownership information and land values attributes,is shared directly from the PostGIS database as vector *** S3 and AWS Lambda services are used for storing and disseminating raster-based land value map *** visualize all shared data and maps through a web browser,open source web mapping library Mapbox GL JS is used.

关键词： Serverless cloud computing cloud GIS open source GIS real estate valuation value map

LEACH OUT GOLD AND SILVER FROM SULFIDE CONCENTRATE CONTAINING COPPER WITH CYANIDE AND AMMONIA SOLUTIONS

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 43-52,57页

作者： Fang Zhaoheng muhammed M Institute of Chemical metallurgy Academia SnicaBeijing 100080 Royal Institute of Technology Sweden

A cyanidation leaching process for a sulfide concentrate containing gold and silver with ammonia and other complexes was investigated,and its potential in decrease of cyanide consumption was *** equilibria behaviors of copper and other metal ions in the CN-NH,-H_(2)0 system and the CN—NH,—EDTA-HjO system were analyzed by a microcomputer *** revealed that the leaching yield of gold in ammonia-cyanide solutions was raised from 86%to 99%from addition of EDTA in a certain concentration and its cooperative action with ammonia on the cyanidation of ***,the leaching yield of silver was significantly increased from about 20%to 55%and the consumption of cyanide was decreased.

关键词： gold silver sulfide cyanidation leaching

Prediction of Excess Air Factor in Automatic Feed Coal burners by Processing of Flame Images

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 722-731页

作者： muhammed Fatih TALU Cem ONAT Mahmut DASKIN computer engineering department inonu university44280 MalatyaTurkey mechanical engineering department inonu university44280 MalatyaTurkey

In this study, the relationship between the visual information gathered from the flame images and the excess air factor 2 in coal burners is investigated. In conventional coal burners the excess air factor 2. can be obtained using very expensive air measurement instruments. The proposed method to predict ） for a specific time in the coal burners consists of three distinct and consecutive stages; a） online flame images acquisition using a CCD camera, b） extrac- tion meaningful information （flame intensity and bright- ness）from flame images, and c） learning these information （image features） with ANNs and estimate 2. Six different feature extraction methods have been used： CDF of blue Channel, Co-Occurrence Matrix, L-Frobenius Norms, Radiant Energy Signal （RES）, PCA and Wavelet. When compared prediction results, it has seen that the use of co- occurrence matrix with ANNs has the best performance （RMSE = 0.07） in terms of accuracy. The results show that the proposed predicting system using flame images can be preferred instead of using expensive devices to measure excess air factor in during combustion.

关键词： Excess air factor Flame images Coal burner

DISSOLUTION KINETICS OF GOLD AND SILVER IN CYANIDATION

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Transactions of Nonferrous Metals Society of China 1992年第3期2卷 53-58页

作者： Fang Zhaoheng Mamoun muhammed Institute of Chemical Metallurgy Academia SinicaBeijing 100080China Royal Institute of Technology Sweden

The dissolution kinetics of gold and silver cyanidation of Cu-Au sulfide concentrate has been investigated at ambient temperature in consideration of effects of various parameters,such as particle size of ores,*** of the process and initial cyanide concentration as well as oxygen partial *** experimental data are mathematically treated with an approach based on the shrinking core model.A phenomenological expression describing the rate and rate constants for cyanidation of the concentrate is developed from the *** dissolution of gold and silver is explained by an electrochemical mechanism in which the rate determining step is,the diffusion of cyanide and dissolved molecular oxygen through a porous layer formed during the minerals dis-solutions.

关键词： dissolution kinetics Cu-Au sulfide concentrate cyanidation electrochemical mechanism