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Reshapeable,rehealable and recyclable sensor fabricated by direct ink writing of conductive composites based on covalent adaptable network polymers

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International Journal of Extreme manufacturing 2022年第1期4卷 94-107页

作者： Xu He Yuchen Lin Yuchen Ding arif m Abdullah Zepeng Lei Yubo Han Xiaojuan Shi Wei Zhang Kai Yu Department of mechanical Engineering University of Colorado DenverDenverCO 80217United States of America Department of Chemistry University of Colorado BoulderBoulderCO 80309United States of America School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080People’s Republic of China

Covalent adaptable network(CAN)polymers doped with conductive nanoparticles are an ideal candidate to create reshapeable,rehealable,and fully recyclable *** the other hand,3D printing as a deterministic manufacturing method has a significant potential to fabricate electronics with low cost and high design *** this paper,we incorporate a conductive composite consisting of polyimine CAN and multi-wall carbon nanotubes into direct-ink-writing 3D printing to create polymeric sensors with outstanding reshaping,repairing,and recycling *** developed printable ink exhibits good printability,conductivity,and *** conductivity of printed polyimine composites is investigated at different temperatures and deformation strain *** shape-reforming and Joule heating-induced interfacial welding effects are demonstrated and ***,a temperature sensor is 3D printed with defined patterns of conductive pathways,which can be easily mounted onto 3D surfaces,repaired after damage,and recycled using *** sensing capability of printed sensors is maintained after the repairing and ***,the 3D printed reshapeable,rehealable,and recyclable sensors possess complex geometry and extend service life,which assist in the development of polymer-based electronics toward broad and sustainable applications.

关键词： bond exchange reactions polyimine covalent adaptable networks direct ink writing rehealable electronics recyclability

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In Vitro Screening of Endophytic Trichoderma sp. Isolated from Oil Palm in FGV Plantation against Ganoderma boninense

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Advances in microbiology 2022年第7期12卷 443-457页

作者： Elya masya mohd Fishal Ili Bazilah Abd Razak Nor Hidayah Bohari muhammad ashraf arif mohd Nasir Crop Protection and Biosolution Department FGV R & D Sdn Bhd Bandar Enstek Malaysia

The potential of several endophytic Trichoderma isolates, isolated from healthy oil palm roots was assessed against Ganoderma boninense (PER71), the causal agent of Basal Stem Rot (BSR) disease through in vitro screening. In the dual culture assay, all endophytic Trichoderma isolates were found to be capable of inhibiting the growth of PER71 mycelium, by causing more than 70% inhibition of the pathogen’s radial growth (PIRG). Trichoderma asperellum m103 has caused the highest inhibition at 93.14%. The volatile compound produced by m103 also suppressed 65% of the pathogen’s radial growth. On the other hand, T. harzianum, m108 was found to have the ability to produce non-volatile compounds that is toxic and it has effectively inhibited 98.18% of the growth of PER71. Collectively, T. asperellum m103 and T. harzianum m108 have the potential to inhibit the growth of G. boninense PER71. These isolates were shown to be viable options for the future management of G. boninense in the oil palm field.

关键词： Endophytic Trichoderma Ganoderma boninense In Vitro Oil Palm

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monte-Carlo simulation of a stochastic differential equation

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Plasma Science and Technology 2017年第12期19卷 6-14页

作者： arif ULLAH majid KHAN m KAmRAN R KHAN 盛正卯 Hefei National Laboratory for Physical Sciences at the microscale University of Science and Technology of ChinaHefei 230026People's Republic of China Department of Physics Quaid-i-Azam University Islamabad Pakistan Department of Physics Institute of Fusion Theory and SimulationsZhejiang UniversityHangzhou 310027People's Republic of China Department of Physics COMSATS Institute of Information TechnologyChack ShahzadIslamabadPakistan Department of Physics Abdul Wali Khan University23200 MardanKPKPakistan

For solving higher dimensional diffusion equations with an inhomogeneous diffusion coefficient,monte Carlo（mC） techniques are considered to be more effective than other algorithms, such as finite element method or finite difference method. The inhomogeneity of diffusion coefficient strongly limits the use of different numerical techniques. For better convergence, methods with higher orders have been kept forward to allow mC codes with large step size. The main focus of this work is to look for operators that can produce converging results for large step sizes. As a first step, our comparative analysis has been applied to a general stochastic ***, our formulization is applied to the problem of pitch angle scattering resulting from Coulomb collisions of charge particles in the toroidal devices.

关键词： monte-Carlo simulation stochastic differential equations toroidal plasmas numerical methods

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Petrogenesis of Granites from the Utla Area of Gadoon, North-West Pakistan: Implications from Petrography and Geochemistry

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Journal of Earth Science 2014年第3期25卷 445-459页

作者： muhammad Sajid mohammad arif m Tahir Shah Department of Geology University of Peshawar National Center of Excellence in Geology University of Peshawar

The granitic rocks around the Utla area（Gadoon）, north western, Pakistan are studied in terms of their petrographic features and geochemical characteristics. Although predominantly mega-porphyritic, some of the Utla granites are massive and display fine-grained equi-granular texture. Some of the mega-porphyritic varieties exhibit foliation and seem to be restricted to shear zones. In addition to being distributed largely as phenocrysts, all the essential minerals（plagioclase, perthitic alkali feldspar and quartz） also constitute the groundmass. The studied samples also contain minor to accessory amounts of tourmaline, muscovite and biotite and accessory to trace amounts of apatite, andalusite, garnet, zircon, monazite, epidote and sphene. A detailed geochemical investigation reveals a calc-alkaline and peraluminous character of the Utla granites. The peraluminous character and total lack of hornblende designate their S-type character while a volcanic arc or syn-collisional tectonic setting for their emplacement is indicated by discrimination diagrams. Further examination shows that the melt parental to the Utla granite was derived from a plagioclase-poor, clay-rich rock, i.e., pelite. The petrogenetically significant petrographic and geochemical features of the Utla granite show greater similarity with the mansehra than the Ambela granites. These include（i） the predominantly megaporphyritic texture,（ii） the presence of andalusite and tourmaline,（iii） the calc-alkaline geochemical signature and（iv） an indication of similar melt source rock character.

关键词： petrography geochemistry granite Utla Pakistan.

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Effects of microstructure characteristics on the tensile properties and fracture toughness of TA15 alloy fabricated by hot isostatic pressing

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International Journal of minerals,metallurgy and materials 2023年第4期30卷 697-706页

作者： Langping Zhu Yu Pan Yanjun Liu Zhiyu Sun Xiangning Wang Hai Nan muhammad-arif mughal Dong Lu Xin Lu Beijing Advanced Innovation Center for materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China AECC Beijing Institute of Aeronautical materials Beijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Sichuan Advanced metal material Additive manufacturing Engineering Technology Research Center Chengdu Advanced Metal Materials Industry Technology Research Institute Co.LtdChengdu 610300China

Powder hot isostatic pressing(HIP) is an effective method to achieve near-net-shape manufacturing of high-quality complex thinwalled titanium alloy parts, and it has received extensive attention in recent years. However, there are few reports about the microstructure characteristics on the strengthening and toughening mechanisms of powder hot isostatic pressed(HIPed) titanium alloys. Therefore, TA15powder was prepared into alloy by HIP approach, which was used to explore the microstructure characteristics at different HIP temperatures and the corresponding tensile properties and fracture toughness. Results show that the fabricated alloy has a “basket-like structure” when the HIP temperature is below 950℃, consisting of lath clusters and surrounding small equiaxed grains belts. When the HIP temperature is higher than 950℃, the microstructure gradually transforms into the Widmanstatten structure, accompanied by a significant increase in grain size. The tensile strength and elongation are reduced from 948 mPa and 17.3% for the 910℃ specimen to 861 mPa and 10% for the 970℃ *** corresponding tensile fracture mode changes from transcrystalline plastic fracture to mixed fracture including intercrystalline *** fracture toughness of the specimens increases from 82.64 mPa·m^(1/2)for the 910℃ specimen to 140.18 mPa·m^(1/2)for the 970℃ *** below 950℃ tend to form holes due to the prior particle boundaries(PPBs), which is not conducive to toughening. Specimens above 950℃ have high fracture toughness due to the crack deflection, crack branching, and shear plastic deformation of the Widmanstatten structure. This study provides a valid reference for the development of powder HIPed titanium alloy.

关键词： powder titanium alloy hot isostatic pressing strength fracture toughness

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Effects of transpiration on unsteady mHD flow of an upper convected maxwell (UCm) fluid passing through a stretching surface in the presence of a first order chemical reaction

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Chinese Physics B 2013年第12期22卷 315-322页

作者： Swati mukhopadhyay m.Golam.arif m.Wazed Ali Pk Department of mathematics The University of Burdwan Institute of Business Administration University of Rajshahi Department of mathematics University of Rajshahi

The aim of this article is to present the effects of transpiration on the unsteady two-dimensional boundary layer flow of non-Newtonian fluid passing through a stretching sheet in the presence of a first order constructive/destructive chemical reaction. The upper-convected maxwell （UCm） model is used here to characterize the non-Newtonian behavior of the fluid. Using similarity solutions, the governing nonlinear partial differential equations are transformed into ordinary ones and are then solved numerically by the shooting method. The flow fields and mass transfer are significantly influenced by the governing parameters. The fluid velocity initially decreases as the unsteadiness parameter increases and the concentration decreases significantly due to the increase in the unsteadiness. The effect of increasing values of transpiration （suction） and the maxwell parameter is to suppress the velocity field; however, the concentration is enhanced as transpiration （suction） and the maxwell parameter increase. Also, it is found that the fluid velocity decreases as the magnetic parameter increases; however, the concentration increases in this case.

关键词： unsteady flow mHD upper convected maxwell fluid stretching surface transpiration chemical reaction

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Greenhouse Gas Emissions from Agro-Ecosystems and Their Contribution to Environmental Change in the Indus Basin of Pakistan

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Advances in Atmospheric Sciences 2008年第6期25卷 1043-1052页

作者： m. mohsin IQBAL m. arif GOHEER Global Change Impact Studies Centre （ GCISC） National Centre for Physics （NCP） Complex Quaid-e-Azam University P.O. QA U-45320 Islamabad Pakistan

There is growing concern that increasing concentrations of greenhouse gases in the atmosphere have been responsible for global warming through their effect on radiation balance and temperature. The magnitude of emissions and the relative importance of different sources vary widely, regionally and locally. The Indus Basin of Pakistan is the food basket of the country and agricultural activities are vulnerable to the effects of global warming due to accelerated emissions of GHGs. many developments have taken place in the agricultural sector of Pakistan in recent decades in the background of the changing role of the government and the encouragement of the private sector for investment in new ventures. These interventions have considerable GHG emission potential. Unfortunately, no published information is currently available on GHG concentrations in the Indus Basin to assess their magnitude and emission trends. The present study is an attempt to estimate GHG （CO2, CH4 and N2O） emissions arising from different agro-ecosystems of Indus Basin. The GHGs were estimated mostly using the IPCC Guidelines and data from the published literature. The results showed that CH4 emissions were the highest （4.126 Tg yr^-1） followed by N20 （0.265 Tg yr^-1） and CO2 （52.6 Tg yr^-1）. The sources of CH4 are enteric fermentation, rice cultivation and cultivation of other crops. N2O is formed by microbial denitrification of NO3 produced from applied fertilizer-N on cropped soils or by mineralization of native organic matter on fallow soils. CO2 is formed by the burning of plant residue and by soil respiration due to the decomposition of soil organic matter.

关键词： greenhouse gases agriculture Indus Basin Pakistan

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Indirect Vector Control of Linear Induction motors Using Space Vector Pulse Width modulation

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Computers, materials & Continua 2023年第3期74卷 6263-6287页

作者： Arjmand Khaliq Syed Abdul Rahman Kashif Fahad Ahmad muhammad Anwar Qaisar Shaheen Rizwan Akhtar muhammad arif Shah Abdelzahir Abdelmaboud Electrical Engineering Department University of Engineering and TechnologyLahore54700Pakistan Department of Basic Sciences Deanship of Common First YearJouf UniversitySakakaAljouf72341Saudi Arabia Department of Information Science Division of Science and TechnologyUniversity of EducationLahore54000Pakistan Department of Computer Science and Information Technology The Islamia University of BahawalpurRahim Yar Khan Sub CampusPakistan Department of IT and Computer Science Pak-Austria Fachhochschule Institute of Applied Sciences and TechnologyHaripurPakistan Department of Information Systems King Khalid UniversityMuhayel Aseer61913Saudi Arabia

Vector control schemes have recently been used to drive linear induction motors(LIm)in high-performance *** trend promotes the development of precise and efficient control schemes for individual *** research aims to present a novel framework for speed and thrust force control of LIm using space vector pulse width modulation(SVPWm)*** framework under consideration is developed in four *** begin,mATLAB Simulink was used to develop a detailed mathematical and electromechanical *** research presents a modified SVPWm inverter control *** tuning the proportional-integral(PI)controller with a transfer function,optimized values for the PI controller are *** the subsystems mentioned above are integrated to create a robust simulation of the LIm’s precise speed and thrust force control *** reference speed values were chosen to evaluate the performance of the respective system,and the developed system’s response was verified using various data *** the low-speed range,a reference value of 10m/s is used,while a reference value of 100 m/s is used for the high-speed *** speed output response indicates that themotor reached reference speed in amatter of seconds,as the delay time is between 8 and 10 *** maximum amplitude of thrust achieved is less than 400N,demonstrating the controller’s capability to control a high-speed LIm with minimal thrust *** to the controlled speed range,the developed system is highly recommended for low-speed and high-speed and heavy-duty traction applications.

关键词： Space vector pulse width modulation linear induction motor proportional-integral controller indirect vector control electromechanical dynamic modeling

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Fast multi-Pattern matching Algorithm on Compressed Network Traffic

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China Communications 2016年第5期13卷 141-150页

作者： Hao Peng Jianxin Li Bo Li m.Hassan arif School of Computer Science and Engineering Beihang University

Pattern matching is a fundamental approach to detect malicious behaviors and information over Internet, which has been gradually used in high-speed network traffic analysis. However, there is a performance bottleneck for multi-pattern matching on online compressed network traffic(CNT), this is because malicious and intrusion codes are often embedded into compressed network traffic. In this paper, we propose an online fast and multi-pattern matching algorithm on compressed network traffic(FmmCN). FmmCN employs two types of jumping, i.e. jumping during sliding window and a string jump scanning strategy to skip unnecessary compressed bytes. moreover, FmmCN has the ability to efficiently process multiple large volume of networks such as HTTP traffic, vehicles traffic, and other Internet-based services. The experimental results show that FmmCN can ignore more than 89.5% of bytes, and its maximum speed reaches 176.470mB/s in a midrange switches device, which is faster than the current fastest algorithm ACCH by almost 73.15 mB/s.

关键词：多模式匹配算法网络流量分析在线压缩最大速度碳纳米管性能瓶颈扫描策略滑动窗口

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Study of K^(*)(892)^(0)andФ(1020)meson production in proton–proton and Pb–Pb collisions at√S_(NN)=2.76 TeV

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Communications in Theoretical Physics 2021年第2期73卷 89-95页

作者： Y Ali m Ahmed A arif Q Ali U Tabassam U Rubab m Suleymanov Department of Physics COMSATS UniversityPark RoadIslamabad44000Pakistan Institute for Physical Problems Baku Suate UniversityBakuAZ 1000Azrbajan

In this paper,we describe a study of charged particle yield as a function of pT for K^(*)(892)0 and phgr(1020)mesons in proton–proton(pp)and Pb–Pb collisions at√S_(NN)=2.76 TeV in the central rapidity region of|y|mportant ratio,the nuclear modification factor,to study the effects of the medium in the most central region,i.e.0%–5%*** data simulation,we used the EPOS-LHC and EPOS-1.99 *** check the validity of these models'simulations,we compared the data obtained from these monte Carlo simulation programs with ALICE experimental data for√S_(NN)=2.76 *** was concluded that the models'predictions for the phgr-meson in pp and for the most central Pb-Pb collisions disagreed with the ALICE data,and that the difference increased with *** may be connected with the essential role of collective parton behaviors which could not have been taken into account by the *** K^(*)0 mesons,both programs gave almost the same predictions,and with pT in the interval pT>3 GeV c^(−1),the predictions were very close to the experimental *** models gave higher predictions for the soft pT interval and lower predictions for the hard *** values of the RAA distributions were lower than unity and both models were very close to the ALICE *** is very interesting that the models were not able to describe the pT distributions,but they gave good predictions for their *** may possibly be due to parton collective *** observed some additional suppression of K^(*)0 at low values of pT with respect to phgr-mesons,which may be related to the role of the masses of the particles in soft *** rising trend for R_(AA)in the region from pT=10 GeV c^(−1)to 20 GeV c^(−1) observed by the ALICE experiment was absent for theФ-mesons.

关键词： Quark Gluon Plasma EPOS-LHC nuclear modification factor

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