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Microstructure Evolution and Mechanical Behavior of Laser Melting Deposited TA15 Alloy at 500℃ under In-Situ Tension in SEM

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Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1201-1212页

作者： Muhammad rizwan Junxia Lu Fei Chen Ruxia Chai Rafi Ullah Yuefei Zhang Ze Zhang Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Special Elastomer Composite Materials College of Materials Science and EngineeringBeijing Institute of Petrochemical TechnologyBeijing 102617China Department of Materials Science and Engineering Zhejiang UniversityHangzhou 310058China

TA15 alloy fabricated by laser melting deposition was investigated at 500℃ under tensile deformation. The damage behavior of microstructure was analyzed by the real time observation of the microstructure evolution, microcracks initiation and propagation using in-situ tensile equipment fitted in the SEM chamber. Finally, the mechanism of fracture was discussed. The result showed anisotropic mechanical properties in X-and Z-direction. The existence of columnar β grains and its orientation to the tensile direction were the major factors inducing the anisotropic mechanical properties. As compared to Z-direction specimen, high tensile strength was observed in X-direction specimen due to the resistance in slips propagation provided by the prior-β grain boundaries( β GBs). Accumulation of the cracks at prior β GB caused the shear fracture. In case of Z-direction specimen, parallel orientation of prior β GB and GB α with the tensile direction resulted in a homogeneous deformation. The high reduction of cross section showed the enhanced ductile characteristics at high temperature.

关键词： TA15 alloy In-situ tensile High temperature mechanical property Fracture Laser additive manufacturing Crack propagation

Radiation efects on MHD stagnation point flow of nano fluid towards a stretching surface with convective boundary condition

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Chinese Journal of Aeronautics 2013年第6期26卷 1389-1397页

作者： Noreen Sher Akbar S.Nadeem rizwan Ul Haq Z.H.Khan DBS&H CEMENational University of Sciences and TechnologyIslamabad 44000Pakistan Department of Mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan School of Mathematical Sciences Peking University

The aim of the present paper is to study the numerical solutions of the steady MHD two dimensional stagnation point flow of an incompressible nano fluid towards a stretching *** effects of radiation and convective boundary condition are also taken into *** model used for the nanofluid incorporates the effects of Brownian motion and *** resulting nonlinear momentum,energy and nano particle equations are simplifed using similarity *** solutions have been obtained for the velocity,temperature and nanoparticle fraction *** influence of physical parameters on the velocity,temperature,nanoparticle fraction,rates of heat transfer and nanoparticle fraction are shown graphically.

关键词： Convective boundary condition Nanoparticles Numerical solutions Radiation effects Stagnation point Stretching surface

Adsorptive removal of phosphate by the bimetallic hydroxide nanocomposites embedded in pomegranate peel

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Journal of Environmental Sciences 2020年第5期32卷 189-198页

作者： Muhammad Akram Xing Xu Baoyu Gao Qinyan Yue Shang Yanan rizwan Khan Muhammad Ali Inam Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266200China Department of Chemical Engineering Quaid-e-Awam University of EngineeringScience and Technology(QUEST)Naiuabshah 67480SindfiPakistan Institute of Environmental Sciences and Engineering(IESE) School of Civil and Environmental Engineering(SCEE)National University of Sciences and Technology(NUST)H-12 CampusIslamabad 44000Pakistan

This study aimed to fabricate new and effective material for the efficiency of phosphate *** types of adsorbent materials,the zirconium hydroxides embedded in pomegranate peel(Zr/Peel)and zirconium-lanthanum hydroxides embedded in pomegranate peel(Zr-La/Peel)were *** electronic microscopy(SEM),x-ray photoelectron spectroscopy(XPS)and x-ray diffraction(XRD)were evaluated to give insight into the physicochemical properties of these ***-La/Peel exceeded the adsorption efficiency of Zr/Peel adsorbents in batch adsorption experiments at the same pH *** peel as a host can strive to have a strong"shielding effect"to increase the steadiness of the entrenched Zr and La *** and Zr are hydroxide metals that emit many hydrogen ions during the hydrolysis reaction,which contribute to protonation and electrostatic *** highest adsorption capacity of La-Zr/Peel for phosphate was calculated to be40.21 mg/g,and pseudo second-order equation is very well fitted for kinetic *** adsorption efficiency was reduced by an increase of *** the background of coexisting Cl-,little effect on adsorption efficiency was observed,while adsorption capacities were reduced by almost 20-30%with the coexistence of SO42-,NO3-and humic acid(HA).

关键词： Bimetallic hydroxides Pomegranate peel Phosphate Adsorption

Data Analysis of Network Parameters for Secure Implementations of SDN-Based Firewall

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Computers, Materials & Continua 2023年第11期77卷 1575-1598页

作者： rizwan Iqbal Rashid Hussain Sheeraz Arif Nadia Mustaqim Ansari Tayyab Ahmed Shaikh Department of Telecommunication Engineering Dawood University of Engineering&TechnologyKarachiPakistan Faculty of Engineering Sciences and Technology Hamdard UniversityKarachiPakistan Faculty of Information Technology Salim Habib UniversityKarachiPakistan Department of Electronic Engineering Dawood University of Engineering&TechnologyKarachiPakistan

Software-Defined Networking(SDN)is a new network technology that uses programming to complement the data plane with a control *** enable safe connection,however,numerous security challenges must be *** attacks have been one of the most prominent risks on the internet for decades,and they are now becoming challenging difficulties in SDN *** solve these challenges,we proposed a unique firewall application built on multiple levels of packet filtering to provide a flooding attack prevention system and a layer-based packet detection *** study offers a systematic strategy for wrapping up the examination of SDN *** Mininet simulator examines the effectiveness of SDN-based firewalls at various network *** fundamental network characteristics that specify how SDN should *** three main analytical measures of the network are jitter,response time,and *** regular operations,their behavior evaluates in the standard SDN conditions of Transmission Control Protocol(TCP)flooding and User Datagram Protocol(UDP)flooding with no SDN *** Orbit Ion Cannon(LOIC)is applied to launch attacks on the transmission by the allocated *** and MATLAB are used for the behavioral study to determine how sensitive the parameters are used in the SDN network and monitor the fluctuations of those parameters for different simulated scenarios.

关键词： Software defined networking firewall POX controller open v switch Mininet OpenFlow

A low complexity online controller using fuzzy logic in energy harvesting WSNs

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Science China(Information Sciences) 2019年第4期62卷 167-176页

作者： Talha AZFAR Waqas AHMED Abdul HASEEB rizwan AHMAD Sufi Tabassum GUL Fu-Chun ZHENG Department of Electrical Engineering Pakistan Institute of Engineering and Applied Sciences (PIEAS) School of Electrical Engineering and Computer Science National University of Sciences and Technology (NUST) School of Electronic and Information Engineering Harbin Institute of Technology

In this paper, we present a fuzzy logic based scheme for a two hop energy harvesting(EH)wireless sensor network(WSN). Incorporating data and energy causality constraints, discrete transmission rates, finite energy and data buffers, a fuzzy model is developed which uses network throughput, battery level and channel gain as inputs. The fuzzy scheme is then compared with optimum, modified optimum, and Markov decision process(MDP) schemes in terms of computational complexity, throughput, battery level and data buffer capacity. The throughput results show that the fuzzy online scheme preforms closely to the compared schemes and avoids battery depletion even when the number of discrete transmission rates are increased.

关键词： wireless sensor networks energy harvesting cooperative communications fuzzy logic

Status and Social Capital:A Cross-Sectional Quantitative Investigation of Flood Survivors in South Punjab,Pakistan

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International Journal of Disaster Risk Science 2022年第4期13卷 549-560页

作者： Muhammad Siddique Akbar Muhammad rizwan Safdar Farhan Navid Yousaf Daniel P.Aldrich Institute of Social and Cultural Studies University of the PunjabLahore 054590Pakistan Security and Resilience Studies Program Department of Political ScienceNortheastern UniversityBostonMA 02115USA

A growing body of evidence underscores that social capital mitigates the impact of natural hazards such as *** we know less about the distribution of social ties in developing countries regularly hit by *** study examined the differences between demographic groups in South Punjab,Pakistan affected by the 2010 floods,comparing respondents'levels of social capital measured through proxies such as received social support,perceived community cohesion,accessibility to leadership,and general level of *** carried out univariate and multivariate analyses of factors including gender,education,occupation,landholding,family size,annual income,number of livestock,and home *** data collected in face-to-face interviews with 450 flood survivors,our analysis showed no statistically significant difference in the flood victims'scores on all four scales based on gender and family ***,education,occupation,landholding,annual income,and home stability statistically correlated with levels of social *** with high levels of education,high levels of land,higher home stability,and a government job typically had higher scores in all four measurements of social *** results show strong inequality in the distribution of social capital,with better connections and assistance coming to those who already have better socioeconomic positions in society.

关键词： Flood survivors Pakistan Social capital South Punjab

Reversible and Reproducible Giant Universal Electroresistance Effect

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Chinese Physics Letters 2011年第10期28卷 217-219页

作者： SYED rizwan ZHANG Sen YU Tian ZHAO Yong-Gang ZHANG Shu-Feng HAN Xiu-Feng Institute of Physics Chinese Academy of SciencesBeijing 100190 Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics University of ArizonaTucsonArizona 85721USA

After the prediction of the giant electroresistance effect,much work has been carried out to find this effect in practical *** demonstrate a novel way to obtain a large electroresistance(ER)effect in the multilayer system at room *** current-in-plane(CIP)electric transport measurement is performed on the multilayer structure consisting of(011)-Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(PMN−PT)/Ta/Al-O/*** is found that the resistance of the top metallic layer shows a hysteretic behavior as a function electric field,which corresponds well with the substrate polarization versus electric field(P–E)*** reversible hysteretic R–E behavior is independent of the applied magnetic field as well as the magnetic structure of the top metallic layer and keeps its memory *** novel memory effect is attributed to the polarization reversal induced electrostatic potential,which is felt throughout the multilayer stack and is enhanced by the dielectric Al-O layer producing unique hysteretic,reversible,and reproducible resistance switching *** novel universal electroresistance effect will open a new gateway to the development of future multiferroic memory devices operating at room temperature.

关键词： resistance multilayer effect

Persistent port-site sinus in a patient after laparoscopic cholecystectomy:watch out for gallbladder tuberculosis

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Hepatobiliary & Pancreatic Diseases International 2011年第3期10卷 328-329页

作者： Tariq Mansoor Syed Amjad Ali Rizvi rizwan Ahmad Khan Department of Surgery Jawaharlal Nehru Medical College HospitalAligarh Muslim University

BACKGROUND:The gallbladder is rarely affected by mycobacterium *** diagnosis of gallbladder tuberculosis is often not suspected prior to surgery or ***:A young female patient underwent laparoscopic cholecystectomy but presented with a persistently discharging sinus from the port ***:The gallbladder biopsy revealed granulomas typical of chronic granulomatous *** condition of the patient was improved by antitubercular ***:Presentation of gallbladder tuberculosis as a persistent discharging sinus at the port site in a patient who has undergone a laparoscopic cholecystectomy is extremely *** diagnosis was reached by histopathology *** rarity of the presentation prompted us to report the case.

关键词： port-site sinus laparoscopic cholecystectomy gallbladder tuberculosis

Real-Time CNN-Based Driver Distraction&Drowsiness Detection System

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Intelligent Automation & Soft Computing 2023年第8期37卷 2153-2174页

作者： Abdulwahab Ali Almazroi Mohammed A.Alqarni Nida Aslam rizwan Ali Shah University of Jeddah College of Computing and Information Technology at KhulaisDepartment of Information TechnologyJeddahSaudi Arabia University of Jeddah College of Computer Science and EngineeringDepartment of Software EngineeringJeddahSaudi Arabia Department of Computer Science National College of Business Administration&EconomicsBahawalpur Campus63100Pakistan Department of Computer Science and Information Technology The Islamia University of BahawalpurRahim Yar Khan CampusPunjab64200Pakistan

Nowadays days,the chief grounds of automobile accidents are driver fatigue and *** the development of computer vision technology,a cutting-edge system has the potential to spot driver distractions or sleepiness and alert them,reducing *** paper presents a novel approach to detecting driver tiredness based on eye and mouth movements and object identification that causes a distraction while operating a motor *** the facial landmarks that the camera picks up and sends to classify using a Convolutional Neural Network(CNN)any changes by focusing on the eyes and mouth zone,precision is *** of the tasks that must be performed in the transit system is seat belt detection to lessen accidents caused by sudden stops or high-speed collisions with other cars.A method is put forth to use convolution neural networks to determine whether the motorist is wearing a seat belt when a driver is sleepy,preoccupied,or not wearing their seat belt,this system alerts them with an alarm,and if they don’t wake up by a predetermined time of 3 s threshold,an automatic message is sent to law enforcement *** suggested CNN-based model exhibits greater accuracy with 97%.It can be utilized to develop a system that detects driver attention or sleeps in real-time.

关键词： Deep learning convolutional neural network Tensorflow drowsiness and yawn detection seat belt detection object detection