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Deflection behavior of a prestressed concrete beam reinforced with carbon fibers at elevated temperatures

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Frontiers of Structural and Civil Engineering 2019年第1期13卷 81-91页

作者： Mohammed FARUQI Mohammed Sheroz khan Department of Civil and Architectural Engineering Texas A&M University--KingsvilleTexasUSA

Fiber reinforced polymer(FRP) have unique advantages like high strength to weight ratio,excellent corrosion resistance,improving deformability and cost *** advantages have gained wide acceptance in civil engineering *** tendons for prestressing applications are emerging as one of the most promising technologies in the civil engineering ***,the behavior of such members under the influence of elevated temperatures is still *** knowledge and application of this could lead to a cost effective and practical considerations in fire safety ***,this study examines the deflection behavior of the carbon fiber reinforced polymer(CFRP) prestressed concrete beam at elevated *** this article,an analytical model is developed which integrates the temperature dependent changes of effective modulus of FRP in predicting the deflection behavior of CFRP prestressed concrete beams within the range of practical *** model is compared with a finite element mode (FEM) of a simply supported concrete beam prestressed with CFRP subjected to practical elevated *** addition,comparison is also made with an indirect reference to the real behavior of the *** results of the model correlated reasonably with the finite element model and the real ***,a practical application is provided.

关键词： FRP CFRP concrete elevated temperatures deflections prestress

Birefringence via Doppler broadening and prevention of information hacking

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Chinese Physics B 2018年第1期27卷 365-370页

作者： Humayun khan Muhammad Haneef Bakhtawar Laborotary of Theoretical Physics Department of Physics Hazara University

We propose a new scheme for the coherent control of birefringent light pulses propagation in a four-level atomic medium. We modify the splitting of a light pulse by controlling the electric and magnetic responses. The Doppler broad- ening effect is also noted on the propagation of the birefringent pulses. The dispersions of the birefringence beams are oppositely manipulated for delay and advancement of time at a Doppler width of 10Y. A time gap is created between the birefringence beams, which protects from hacking of information. The time gap is then closed to restore the pulse into the original form by a reverse manipulation of the dispersion of the birefringence beams, i.e., introducing another medium whose transfer function is the complex conjugate of that of the original medium. The results are useful for secure communication technology.

关键词： birefringence Doppler broadening time gap hacking

Performance of Text-Independent Automatic Speaker Recognition on a Multicore System

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Tsinghua Science and Technology 2024年第2期29卷 447-456页

作者： Rand Kouatly Talha Ali khan Faculty of Tech and Software Engineering University of Europe for Applied SciencesPotsdam 14469Germany

This paper studies a high-speed text-independent Automatic Speaker Recognition(ASR)algorithm based on a multicore system's gaussian Mixture Model(gMM).The high speech is achieved using parallel implementation of the feature's extraction and aggregation methods during training and testing *** memory parallel programming techniques using both OpenMP and PThreads libraries are developed to accelerate the code and improve the performance of the ASR *** experimental results show speed-up improvements of around 3.2 on a personal laptop with Intel i5-6300HQ(2.3 gHz,four cores without hyper-threading,and 8 gB of RAM).In addition,a remarkable 100%speaker recognition accuracy is achieved.

关键词： Automatic Speaker Recognition(ASR) gaussian Mixture Model(gMM) shared memory parallel programming PThreads OpenMP

Slip flow of MHD Casson fluid in an inclined channel with variable transport properties

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Communications in Theoretical Physics 2020年第9期72卷 21-38页

作者： K V Prasad Hanumesh Vaidya C Rajashekhar Sami Ullah khan g Manjunatha J U Viharika Department of Mathematics Vijayanagara Sri Krishnadevaraya UniversityVinayaka NagarBallari-583105KarnatakaIndia Bhaskaracharya Study Chair Karnataka State Akkamahadevi Women's UniversityVijayapuraKarnatakaIndia Department of Mathematics COMSTAS University IslamabadSahiwal Campus 54000Pakistan Department of Mathematics Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka576104-India

Due to the instructive role of the peristaltic phenomenon in the human body, interests have been developed in recent years towards peristaltic transport with various thermo-physical *** current investigation reveals the effects of the magnetic field and variable transport properties on the peristaltic transport of a Casson fluid slip flow through an inclined *** coupled partial differential equations regulate the fluid flow. Through the perturbation method, the momentum and energy equations are solved for small values of variable viscosity and thermal conductivity, and the closed-form solution is obtained for mass transfer. The impact on physiological quantities of related parameters of interest is evaluated and discussed via graphs. The results obtained for the current flow represent some interesting behaviors which have applications in the biomedical field.

关键词： velocity slip thermal slip concentration slip variable viscosity yield stress

High Velocity Compaction of Aluminum Powders

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稀有金属材料与工程 2011年第S3期40卷 86-89页

作者： khan Dil Faraz University of Science and Technology Beijing

High velocity compaction process of atomized Al powders was studied. The green density, the maximal force and the withdraw force of specimen were investigated. The green density of atomized aluminum powder was obtained to be 2.68 g/cm3 and its relative density is about 99%. The maximal force increased proximately linearly with the compaction energy. The withdraw force was observed ranging between 30 and 70 kN. The radial spring back was less than 0.1%.

关键词： high velocity compaction powder metallurgy aluminum powder

Etch Induction Time in CR-39 Detectors Etched in Na2CO3 Mixed NaOH Solution

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Chinese Physics Letters 2009年第9期26卷 105-107页

作者： N. Ali E. U. khan K. khan DPAM PLEAS P.O. Nilore Islamabad Pakistan P.D PINSTECH P.O. Nilore Islamabad Pakistan Department of Physics CIIT Islamabad Pakistan HPD PINSTECH P.O. Nilore Islamabad Pakistan

Six different solutions of 6M NaOH, containing different amounts of Na2CO3 at 70℃ were used for the revelation of latent damage trails in CR-39 plastic track detectors. These detectors were earlier exposed to fission fragments from ^252 Cf source for 30 min in vacuum and were then etched in the respective solutions for different etching time intervals of 5-20 min starting from 5min up to 160min. The etch induction time in each detector was obtained by extrapolating the intersection of resulting curves of track lengths and track diameters with the time axis.

关键词： No English Keyword

Comparative study of living donor kidney transplants:Right vs left

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World Journal of Transplantation 2025年第1期15卷 115-123页

作者： Taqi khan Nadeem Ahmad Qaisar Iqbal Muneeb Hassan Lajward Asnath Naveed khan Sajid Shakeel Kidney Transplant Unit Rehman Medical InstitutePeshawar 25100Khyber PakhtunkhwaPakistan Department of Surgery Princess Noura Binti AbdulRehman UniversityRiyadh 84428Saudi Arabia

BACKgROUND Transplant teams often hesitate to use the right kidney(RK)in living donor(LD)transplants due to the complexities of anastomosing the short,thin-walled right renal veins,which can potentially lead to graft loss or graft ***,circumstances may arise where selecting the RK over the left kidney(LK)is ***,it is crucial to thoroughly examine the implications of such a choice on the overall transplant *** To compare transplant outcomes between recipients of RK and LK while examining the factors that influence these *** We retrospectively analyzed data from adult patients who received LD kidney transplants involving meticulous patient selection and surgical techniques at our center from January 2020 to December *** included all kidney donors who were over 18,fit to donate,and had undergone diethylenetriamine pentaacetic acid split function and/or computed tomography based *** variables examined comprised donor and recipient demographics,and outcome measures included technical graft loss(TgL),delayed or slow graft function(SgF),and post-transplant serum creatinine(SC)*** used a logistic regression model to assess the likelihood of adverse outcomes considering the donor kidney *** Of the 250 transplants performed during the period,56(22%)were *** recipient demographics and transplant factors were comparable for the right and LKs,except that the donor warm and cold ischemia time were shorter for *** and SgF each occurred in 2%(n=1)of RKs and 0.5%(n=1)of LKs,the difference being *** complications,however,were not related to the venous *** RK(2%)developed delayed graft function after 48 hours,which was attributable to postoperative hypoxia rather than the surgical *** post-transplant SC trend and mean SC at the last follow-up were similar across both kidney *** The donor kidney side has little impact on post-transplant

关键词： Living donor Right kidney Right renal vein Venous anastomosis Technical graft loss Early graft function

Transcription regulators differentiate mesenchymal stem cells into chondroprogenitors,and their in vivo implantation regenerated the intervertebral disc degeneration

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World Journal of Stem Cells 2022年第2期14卷 163-182页

作者： Shumaila Khalid Sobia Ekram Asmat Salim g.Rasul Chaudhry Irfan khan Dr.Panjwani Center for Molecular Medicine and Drug Research International Center for Chemical and Biological SciencesUniversity of KarachiKarachi 75270SindhPakistan Department of Biological Sciences Oakland UniversityRochesterMI 48309United States

BACKgROUND Intervertebral disc degeneration(IVDD)is the leading cause of lower back *** degeneration is characterized by reduced cellularity and decreased production of extracellular matrix(ECM).Mesenchymal stem cells(MSCs)have been envisioned as a promising treatment for degenerative ***-based therapy using ECM-producing chondrogenic derivatives of MSCs has the potential to restore the functionality of the intervertebral disc(IVD).AIM To investigate the potential of chondrogenic transcription factors to promote differentiation of human umbilical cord MSCs into chondrocytes,and to assess their therapeutic potential in IVD *** MSCs were isolated and characterized morphologically and immunologically by the expression of specific *** were then transfected with Sox-9 and Six-1 transcription factors to direct differentiation and were assessed for chondrogenic lineage based on the expression of specific *** differentiated MSCs were implanted in the rat model of *** regenerative potential of transplanted cells was investigated using histochemical and molecular analyses of *** Isolated cells showed fibroblast-like morphology and expressed CD105,CD90,CD73,CD29,and Vimentin but not CD45 *** of Sox-9 and Six-1 greatly enhanced the gene expression of transforming growth factor beta-1 gene,BMP,Sox-9,Six-1,and Aggrecan,and protein expression of Sox-9 and *** implanted cells integrated,survived,and homed in the degenerated intervertebral *** grading showed that the transfected MSCs regenerated the IVD and restored normal *** genetically modified MSCs accelerate cartilage regeneration,providing a unique opportunity and impetus for stem cell-based therapeutic approach for degenerative disc diseases.

关键词： Intervertebral disc degeneration Human umbilical cord Transcription factors Mesenchymal stem cells gene expression Regeneration

Next-generation Intelligent MXene-Based Electrochemical Aptasensors for Point-of-Care Cancer Diagnostics

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Nano-Micro Letters 2022年第6期14卷 248-281页

作者： Arpana Parihar Ayushi Singhal Neeraj Kumar Raju khan MohdAkram khan Avanish KSrivastava Industrial Waste Utilization Nano and BiomaterialsCSIR-Advanced Materials and Processes Research Institute(AMPRI)Hoshangabad RoadBhopal 462026MPIndia Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India

Delayed diagnosis of cancer using conventional diagnostic modalities needs to be addressed to reduce the mortality rate of ***,2 D nanomaterial-enabled advanced biosensors have shown potential towards the early diagnosis of *** high surface area,surface functional groups availability,and excellent electrical conductivity of MXene make it the 2 D material of choice for the fabrication of advanced electrochemical biosensors for disease ***-enabled electrochemical aptasensors have shown great promise for the detection of cancer biomarkers with a femtomolar limit of ***,the stability,ease of synthesis,good reproducibility,and high specificity offered by MXene-enabled aptasensors hold promise to be the mainstream diagnostic *** this review,the design and fabrication of MXene-based electrochemical aptasensors for the detection of cancer biomarkers have been ***,various synthetic processes and useful properties of MXenes which can be tuned and optimized easily and efficiently to fabricate sensitive biosensors have been ***,futuristic sensing applications along with challenges will be deliberated herein.

关键词： MXene Electrochemical devices POCT Aptamer Cancer diagnostics