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Base Pressure Control with Semi-Circular Ribs at Critical Mach Number

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Fluid Dynamics & Materials Processing 2024年第9期20卷 2007-2028页

作者： Ambareen Khan Sher Afghan Khan mohammed Nishat Akhtar abdul Aabid Muneer Baig School of Aerospace Engineering Universiti Sains MalaysiaPenang11600Malaysia Department of Mechanical and Aerospace Engineering Faculty of EngineeringInternational Islamic University MalaysiaKuala Lumpur59000Malaysia Department of Engineering Management College of EngineeringPrince Sultan UniversityP.O.Box 66833Riyadh11586Saudi Arabia

When better fuel-air mixing in the combustion chamber or a reduction in base drag are required in vehicles,rockets,and aeroplanes,the base pressure control is *** the base pressure and drag is necessary in both *** this work,semi-circular ribs with varying diameters(2,4,and 6 mm)positioned at six distinct positions(0.5D,1D,1.5D,2D,3D,and 4D)inside a square duct with a side of 15 mm are proposed as an efficient way to apply the passive control ***-depth research is done on optimising rib size for various rib *** to this study,the base pressure rises as rib height ***,the optimal location for the semi-circular ribs with a diameter of 2 mm is at *** 1D location appears to be optimal for the 4 mm size as *** the 6 mm size,however,the 4D position fills this function.

关键词： Base pressure nozzle pressure ratio base drag sonic Mach number passive control

Effect of Absorption of Patch Antenna Signals on Increasing the Head Temperature

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Computer Modeling in Engineering & Sciences 2020年第8期124卷 683-701页

作者： Mohamed Abbas Ali Algahtani Amir Kessentini Hassen Loukil Muneer Parayangat Thafasal Ijyas abdul Wase mohammed Electrical Engineering Department College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia Department of Mechanical Engineering College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia Department of Computers and Communications College of EngineeringDelta University for Science and TechnologyGamasa35712Egypt Laboratory of Electromechanical Systems(LASEM) National Engineering School of SfaxUniversity of SfaxSfax3038Tunisia Electronics and Information Technology Laboratory University of SfaxNational Engineering School of SfaxSfax3038Tunisia Research Center for Advanced Materials Science King Khalid UniversityAbha61413Saudi Arabia Nabeul’s Foundation Institute for Engineering Studies University of CarthageIPEINNabeul8000Tunisia

Every new generation of antennas is characterized by increased accuracy and faster transmission ***,patch antennas have been known to damage human *** type of antenna sends out electromagnetic waves that increase the temperature of the human head and prevent nerve strands from functioning *** paper examines the effect of the communication between the patch antenna and the brain on the head’s temperature by developing a hypothetical multi-input model that achieves more accurate *** inputs are an individual’s blood and tissue,and the emission power of the *** forces depend on the permeability and conductivity characteristics of the metal from which the antenna is *** proposed model is the first one that links the material the antenna is manufactured from and the head’s *** results show that there are only a small number of materials that should be used as antenna *** materials are in the form of thin *** using these thin films at different temperatures,the risk to the head can be *** paper finds that the best results were obtained when the patch antenna was made of one of the following materials operating at a specific temperature:traditional materials at 305°K;casting cast steel at around 295°K;bismuth telluride(Bi2Te3)at 290°K;or barium sodium niobate at 310°K.

关键词： Brain patch antenna head overheating waves behavior materials properties

Propagation Characteristics of Acoustic Field in the Borehole Surrounded by Unconsolidated Sands

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Propagation Characteristics of Acoustic Field in the Borehol...

作者： Sonia mohammed abdul-Jabbar Mahmood（索尼娅）长安大学

学位级别：硕士

在地球物理勘探中,未固结砂岩在浅海沉积岩中比较常见。研究声波在未固结砂岩中的声波传播特征对获取未固结砂岩储层的性质具有重要意义。由于未固结砂岩与胶结好的砂岩介质不同,其颗粒之间呈弱胶结状态,其弹性模量的计算与固结砂岩不... 详细信息

在地球物理勘探中,未固结砂岩在浅海沉积岩中比较常见。研究声波在未固结砂岩中的声波传播特征对获取未固结砂岩储层的性质具有重要意义。由于未固结砂岩与胶结好的砂岩介质不同,其颗粒之间呈弱胶结状态,其弹性模量的计算与固结砂岩不同。本文对未固结砂岩的有效介质模型和理论进行了简要回顾,简要介绍了描述未固结砂岩的几种常见声场模型。针对未固结砂岩弹性模量,本文介绍了以Hertz-Mindlin模型为基础的计算未固结砂岩弹性模量的计算方法;针对未固结砂岩中的声场传播,本文介绍了以Biot-Stoll方程为基础的BICSQS模型,另外还介绍了基于颗粒介质传播频散关系的Grain-shearing(GS)理论。与此同时,本文根据Biot-Stoll方程计算了颗粒介质传播时纵横波频散曲线,并通过解析法获得了井孔声场的解析解,计算出了井中接收到的声波波形,通过数值模拟获得颗粒的弛豫性质对井孔声场传播的影响。此外,本文利用了Hertz-Mindlin模型,对井内外声场进行了数值模拟,获得不同颗粒特征对井孔声场的传播影响。

关键词：井孔声场传播 Biot-Stoll模型颗粒接触未固结砂岩

Synthesis, characterization and electrochemical evaluation of anticorrosion property of a tetrapolymer for carbon steel in strong acid media

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Chinese Journal of Chemical Engineering 2019年第4期27卷 965-978页

作者： Shamsuddeen A.Haladu Saviour A.Umoren Shaikh A.Ali Moses M.Solomon abdul-Rashid I.mohammed Department Basic Sciences and Humanities College of Engineering Imam Abdulrahman Bin Faisal University Dammam 31451 Saudi Arabia Centre of Research Excellence in Corrosion Research Institute King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia Department of Chemistry King Fahd University of Petroleum & Minerals Dhahran 31261 Saudi Arabia Centre for Engineering Research Research Institute King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia

A novel tetrapolymer(TP) consisting of carboxylate, sulphonate, phosphonate and sulfur dioxide based comonomers was synthesized using Butler cyclopoymerization technique. The synthesized tetrapolymer was characterized using FTIR,1H-NMR,13CNMR and elemental analysis. The performance of the tetrapolymer as a corrosion inhibitor for St37 carbon steel in 15% HCl and 15% H2SO4 acid media was assessed using electrochemical impedance spectroscopy(EIS), linear polarization resistance(LPR), potentiodynamic polarization(PDP) and electrochemical frequency modulation(EFM) techniques. The influence of addition of a small amount of KI on the corrosion inhibition efficiency of TP was also assessed. Results obtained showed that the tetrapolymer moderately inhibited the corrosion of St37 steel in the acid media with protection efficiency of 79.5% and 61.1% at the optimum concentration of 1000 mg·L^-1 studied in HCl and H2SO4 media respectively. On addition of 5 mmol·L^-1 KI to the optimum tetrapolymer concentration, the protection efficiency was upgraded to 90.6% and 93.5% in HCl and H2SO4 environment, respectively. The enhanced performance of the polymer in the presence of KI is due to synergistic action deduced from synergism parameter(S1) which was found to be greater than *** tetrapolymer afforded the corrosion inhibition of St37 steel in the acid media by virtue of adsorption of the polymer molecules on the steel surface which was confirmed by ATR-FTIR analysis of the adsorbed film extracted from the steel surface. TP + KI formed complex with St37 steel surface in H2SO4 solution but not in HCl solution.

关键词： Tetrapolymer Metal Acid corrosion Corrosion inhibition Adsorption Synergism

Professional identity, wellness, and future hope among nurse interns in Egypt

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Frontiers of Nursing 2021年第3期8卷 279-290页

作者： Rasha mohammed Hussien Mahmoud abdul Hameed Shahin Mervat Elshahat Ibrahim Department of Psychiatric Health Nursing Faculty of NursingZagazig UniversityZagazig 423423Egypt Critical Care Nursing Department Mohammed Al-Mana College for Medical SciencesDammam 34222Saudi Arabia Department of Family and Community Health Nursing Faculty of NursingSuez Canal UniversityIsmailia 545345Egypt

Objective:Since nursing is a performance-based profession,clinical learning environments play an important role in the acquisition of professional abilities and train nursing students to enter the nursing profession and become a registered *** study aimed to investigate the relations among professional identity,wellness,and future hope in nurse ***:A cross-sectional,analytic,descriptive,correlational study design was used to test these relations in the study where 210 nurse interns’students were selected using a convenience sampling from Zagazig University hospitals and Suez Canal University hospitals in *** questionnaires consisted of 4 parts,namely demographic characteristics,Professional Identity Scale for Nursing Students(PISNS),Holistic Health and Wellness Survey,and Hope ***:Less than half of the study sample had chosen nursing specialty by own will(43.8%),while slightly more than half of them had a"very good"graduation level,and had no nursing role *** lowest mean professional identity score was for independence in career choice while the highest was for social *** repor ted physical wellness mean-score was the least,while social wellness was the *** identity,wellness,and future hope scores differed significantly based on nurse interns’personal *** were statistically significant,positive,weak-to-moderate correlations among the scores of professional identity,wellness,and future hope;however,the"choice of nursing study by own will"was a statistically significant independent positive predictor of the scores of professional identity,wellness,and future ***:Nurse interns’professional identity,wellness,and future hope were positively ***,nurse interns’wellness was the lowest,and it should be fostered as it was the main predictor for future *** internship programs should be modulated to improve nurse interns’professional identity,par ticularly

关键词： hope identity independence internship nurse interns professional wellness

Arabic Feature-Based Text Watermarking Technique for Sensitive Detecting Tampering Attack

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Computers, Materials & Continua 2021年第9期68卷 3789-3806页

作者： Fahd N.Al-Wesabi Huda G.Iskandar Saleh Alzahrani Abdelzahir Abdelmaboud mohammed abdul Nadhem Nemri Mohammad Medani mohammed Y.Alghamdi Department of Computer Science King Khalid UniversityMuhayel AseerKingdom of Saudi Arabia Faculty of Computer and IT Sana’a UniversitySana’aYemen School of Computing Faculty of EngineeringUniversiti Teknologi MalaysiaMalaysia Department of Information Systems King Khalid UniversityMuhayel AseerKingdom of Saudi Arabia Department of Computer Science Faculty of Science&Arts of BaljurshiAl-Baha UniversityKSA

In this article,a high-sensitive approach for detecting tampering attacks on transmitted Arabic-text over the Internet(HFDATAI)is proposed by integrating digital watermarking and hidden Markov model as a strategy for soft *** HFDATAI solution technically integrates and senses the watermark without modifying the original *** alphanumeric mechanism order in the first stage focused on the Markov model key secret is incorporated into an automated,null-watermarking approach to enhance the proposed approach’s efficiency,accuracy,and *** first-level order and alphanumeric Markov model technique have been used as a strategy for soft computing to analyze the text of the Arabic *** addition,the features of the interrelationship among text contexts and characteristics of watermark information extraction that is used later validated for detecting any tampering of the Arabic-text *** HFDATAI strategy was introduced based on PHP with included IDE of VS *** of four separate duration datasets in random sites illustrate the fragility,efficacy,and applicability of HFDATAI by using the three common tampering attacks i.e.,insertion,reorder,and *** HFDATAI was found to be effective,applicable,and very sensitive for detecting any possible tampering on Arabic text.

关键词： Watermarking soft computing text analysis hidden Markov model content authentication

Organizational Data Breach:Building Conscious Care Behavior in Incident Response

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Computer Systems Science & Engineering 2022年第2期40卷 505-515页

作者： Adlyn Adam Teoh Norjihan Binti abdul Ghani Muneer Ahmad Nz Jhanjhi mohammed A.Alzain Mehedi Masud Department of Information Systems Faculty of Computer Science&Information TechnologyUniversiti Malaya50603Kuala LumpurMalaysia School of Computer Science and Engineering SCE Taylor’s UniversitySubang Jaya47500Malaysia Department of Information Technology College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of Computer Science College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia

Organizational and end user data breaches are highly implicated by the role of information security conscious care behavior in respective incident *** research study draws upon the literature in the areas of information security,incident response,theory of planned behaviour,and protection motivation theory to expand and empirically validate a modified framework of information security conscious care behaviour *** applicability of the theoretical framework is shown through a case study labelled as a cyber-attack of unprecedented scale and sophistication in Singapore’s history to-date,the 2018 SingHealth data *** single in-depth case study observed information security awareness,policy,experience,attitude,subjective norms,perceived behavioral control,threat appraisal and self-efficacy as emerging prominently in the framework’s applicability in incident *** data analysis did not support threat severity relationship with conscious care *** findings from the above-mentioned observations are presented as possible key drivers in the shaping information security conscious care behaviour in real-world cyber incident management.

关键词： End user computing organizational behavior incident response data breach computer emergency response team cyber-attack

A New Expression for Rhotrix

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Advances in Linear Algebra & Matrix Theory 2014年第2期4卷 128-133页

作者： abdul mohammed Department of Mathematics Ahmadu Bello University Zaria Nigeria

This paper presents a new technique for expressing rhotrices in a generalize form. The method involves using multiple array indexes as analogous to matrix expressions, unlike the earlier method in the literature, which can only be functional in a single array computational environment. The new rhotrix look will encourage the study of rhotrix algebra and analysis from a better perspective. In addition, computing efficiency and accuracy will also be improved, particularly when the operations in rhotrix space over the new expression are algorithmatized for computing machines.

关键词： Rhotrix Rhotrix Space Rhotrix Generalization Rhotrix Operations

Large-Scale Kinetic Parameter Identification of Metabolic Network Model of <i>E. coli</i>Using PSO

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Advances in Bioscience and Biotechnology 2015年第2期6卷 120-130页

作者： mohammed Adam Kunna Tuty Asmawaty abdul kadir Aqeel S. Jaber Julius B. Odili Faculty of Computer System and Software Engineering Universiti Malaysia Pahang Kuantan Malaysia Faculty of Electrical and Electronic Engineering Universiti Malaysia Pahang Kuantan Malaysia

In metabolic network modelling, the accuracy of kinetic parameters has become more important over the last two decades. Even a small perturbation in kinetic parameters may cause major changes in a model’s response. The focus of this study is to identify the kinetic parameters, using two distinct approaches: firstly, a One-at-a-Time Sensitivity Measure, performed on 185 kinetic parameters, which represent glycolysis, pentose phosphate, TCA cycle, gluconeogenesis, glycoxylate pathways, and acetate formation. Time profiles for sensitivity indices were calculated for each parameter. Seven kinetic parameters were found to be highly affected in the model response;secondly, particle swarm optimization was applied for kinetic parameter identification of a metabolic network model. The simulation results proved the effectiveness of the proposed method.

关键词： Metabolic Engineering Metabolic Network Dynamic Model Sensitivity Analysis Optimization and Estimation