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Enhancement of terbium efficiency by gallium and copper co-doping in(Pr,Nd)-Fe-B sintered magnets

Journal of Rare Earths 2023年第4期41卷 572-577页

作者： Qingfang Huang Qingzheng Jiang Yao Shi Sajjad ur.rehman Xing Wei Ruoshu Wang Yongjian Zhang Deqin Xu Dakun Chen Zhenchen Zhong Jiangxi Key Laboratory for Rare Earth magnetic materials and Devices&College of Rare Earth Jiangxi University of Science and TechnologyGanzhou 341000China Institute of Rare Earth magnetic material Xiamen Tungsten Co.Ltd.Xiamen 361010China Fujian Key Laboratory for Rare Earth Functional materials Longyan 366300China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

It is well known that Tb substitution for(Pr,Nd)in(Pr,Nd)-Fe-B based sintered magnetic materials is an effective way to increase intrinsic coercivity,but it is not quite clear whether the increment depends on the different matrix phases with various doping ingredient or not,which is essential to develop high quality magnets with high coercivity more efficiently and effectively with economic consumption of expensive Tb and other costly heavy rare *** this paper,we investigated the efficiency of Tb substitution for magnetic property in(Pr,Nd)-Fe-B sintered permanent magnets by co-doping Ga and Cu *** is shown that Ga and Cu co-doping can effectively improve the efficiency of Tb substitution to increase the thermal stability and the *** intrinsic coercivity increases up to 549 and 987 kA/m respectively by 1.5 wt%and 3.0 wt%Tb substitution in Ga and Cu co-doped magnets while the intrinsic coercivity increases up to only 334 and 613 kA/m respectively by the same amounts of Tb substitution in non-Ga and low-Cu *** other words,it demonstrates that there is about 329-366 kA/m linear equivalent enhancement of intrinsic coercivity by 1.0 wt%Tb substitution for(Pr,Nd)in Ga and Cu co-doped *** temperature coefficients of both intrinsic coercivityβand remanenceαat 20-150℃by 3.0 wt%Tb substitution for the magnets with Ga and Cu co-doping are-0.47%/K and-0.109%/K respectively,and in contrast those values are-0.52%/K and 0.116%/K respectively for the non-Ga and low-Cu *** is the principal reason for more efficient enhancement of magnetic property by Tb substitution in the Ga and Cu co-doped magnets in which Tb atoms are expelled from triple junction phases(TJPs)to penetrate into the grain boundary phases(GB phases)and thus modify the grain *** is prospected that the efficiency of Tb substitution would rely on different matrix phases with various doping constituents.

关键词： (Pr Nd)-Fe-B magnet magnetic properties microstructure Efficiency of Tb substitution Ga and Cu co-doping Rare earths

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Green managerial practices and green performance:A serial mediation model

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International Journal of Innovation Studies 2023年第3期7卷 214-225页

作者： Shafique ur.rehman Hamzah Elrehail marc Poulin mohamed Dawood Shamout Haitham m.Alzoubi Research Institute of Business Analytics and Supply Chain management College of ManagementShenzhen UniversityShenzhen518060China Abu Dhabi School of management Leadership and Organizational Development Program Abu Dhabi503000United Arab Emirates Abu Dhabi School of management Quality and Business Excellence Abu Dhabi50300United Arab Emirates University of Sharjah College of BusinessAdministrationSharjah503000United Arab Emirates Skyline University College School of Business Sharjah503000United Arab Emirates

This study examines the influence of green supply chain management(GSCm)practices and green culture on green performance in the manufacturing sector through the mediating effect of proactive environmental strategy(PES)and green product innovation(GPI).A quantitative approach was followed,and partial least squares structural equation modeling(PLS-SEm)was used for hypothesis testing.A questionnaire was used to collect data,and 663 questionnaires were included in the final *** to our expectations,the results showed that Gscm practices do not influence green performance,whereas green culture is positively related to green *** results show that PES and GPI explain the relationship between GSCm practices,green culture,and green *** and GPI sequentially mediated GSCm practices,green culture,and green ***,PES and GPI significantly improved green *** study aims to extend the scholarly appreciation of Gscm practices and the impact of green culture on green performance by examining the mediating effects of PES and GPI on these *** implications and future research avenues are also discussed.

关键词： Green supply chain management(GSCm)practices Green culture Proactive environmental strategy(PES) Green product innovation(GPI) Green performance Smart-PLS

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magnetic-field-driven reverse martensitic transformation with multiple magneto-responsive effects by manipulating magnetic ordering in Fe-doped Co-V-Ga Heusler alloys

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Journal of materials Science & Technology 2020年第23期58卷 145-154页

作者： Kai Liu Shengcan ma Yuxi Zhang Hai Zeng Guang Yu Xiaohua Luo Changcai Chen Sajjad ur.rehman Yongfeng Hu Zhenchen Zhong Jiangxi Key Laboratory for Rare Earth magnetic materials and Devices/Institute for Rare Earth magnetic materials and Devices(IREmmD) Jiangxi University of Science and TechnologyGanzhou 341000China School of materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Canadian Light Source University of SaskatchewanSaskatoonSaskatchewan S7N 2V3Canada

Nowadays,searching for the materials with multiple magneto-functional properties and good mechanical properties is vital in various fields,such as solid-state refrigeration,magnetic actuators,magnetic sensors and intelligent/smart *** this work,the magnetic-field-induced metamagnetic reverse martensitic transformation(mFIRmT)from paramagnetic martensite to ferromagnetic austenite with multiple magneto-responsive effects is realized in Fe-doped Co-V-Ga Heusler alloys by manipulating the magnetic *** martensitic transformation temperature Tmreduces quasi-linearly with increasing *** strikingly contrast with the Fe-free alloys,the magnetization difference(m')across martensitic transformation increases by three orders of magnitude for Fe-doped *** increased m'should be ascribed to the reduction of Tm,almost unchanged Curie temperature of austenite and the increased magnetic moment in the samples with higher *** large m'provides strong driving force to realize the mFIRmT and accordingly multiple magneto-responsive effects,such as magnetocaloric,magnetoresistance and magnetostriction ***,giant Vickers hardness of 518 HV and compressive strength of 1423 mPa are *** magneto-responsive effects with exceptional mechanical properties make these alloys great potential candidates for applications in many fields.

关键词： magneto-functional properties mechanical properties Ferromagnetic ordering Reverse martensitic transformation multiple magneto-responsive effects Co-based Heusler alloys

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Extraordinary simultaneous enhancement of the coercivity and remanence of dual alloy HRE-free Nd-Fe-B sintered magnets by post-sinter annealing

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Journal of materials Science & Technology 2022年第11期106卷 236-242页

作者： Qingfang Huang Qingzheng Jiang Jifan Hu Sajjad ur.rehman Gang Fu Qichen Quan Jixiang Huang Deqin Xu Dakun Chen Zhenchen Zhong Jiangxi Key Laboratory for Rare Earth magnetic materials and Devices&College of Rare Earths Jiangxi University of Science and TechnologyGanzhou 341000China Fujian Key Laboratory for Rare Earth Functional materials Longyan 366300China School of materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Post-sinter annealing process plays an important role in the microstructures and magnetic properties of the Nd-Fe-B sintered *** this paper,systematically investigated are the magnetic properties and microstructures of the as-sintered and post-sinter annealed Nd-Fe-B magnets with Pr-Fe-Ga boundary *** choice consecutive annealing methods are adopted at high and low temperatures,namely the 1 st annealing at 880℃ for 2 h and then the 2^(nd) annealing at 440℃ for 3 *** is exceptional to find out that both the remanence and coercivity are improved after 2^(nd) annealing process for this type of *** coercivity is hugely increased from 10.09 kOe for the as-sintered sample to 17.19 kOe for the 2^(nd) annealed magnet,with a significant increment of 70.37%in *** extraordinary magnetic properties of B_(r)=14.44 kGs,H_(cj)=17.19 kOe and(BH)_(max)=51.08 mGOe are obtained for the designated Nd-Fe-B sintered magnets without heavy rare earth(HRE)elements manufactured by dual alloy *** Curie temperature is monotonically decreased from 634 K to 602 K while the c-axis alignment degree is optimized after *** observation and analysis indicate that the elemental distribution patterns are altered after the 2^(nd) *** diffusion of the aggregate(Pr,Nd,Cu,Ga)-rich phase from triple junctions into the grain boundary regions is ascribed to the formation of thin and continuous grain boundary layer,which is critical to improve the microstructures and magnetic properties.

关键词： Nd-Fe-B sintered magnets HRE-free Dual alloy method Post-sinter annealing magnetic properties

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Synthesis,Characterization,Biological and Docking Simulations of 4-(Benzylideneamino) Benzoic Acids

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Chinese Journal of Structural Chemistry 2021年第3期40卷 291-300,271页

作者： HAmID Aziz AAmER Saeed FARUKH Jabeen ABDUL Basit IRFAN Zia Qureshi ABDUL Aziz ATIF Haroon ASHFAQ ur.rehman Department of Chemistry Quaid-I-Azam University Islamabad 45320 Pakistan Computation ScienceResearch and Development Organization14012485 Hurontraio StreetMississaugaONCaL5A2G6 Department of Biology Laurentian University935 Ramsey Lake RoadSudburyONCanada P3E2C6 Department of Animal Sciences Quaid-I-Azam University Islamabad 45320 Pakistan Department of microbiology Quaid-I-Azam University Islamabad 45320 Pakistan Department of Biochemistry Shankar CampusAbdul Wali Khan UniversityMardan 23200Khyber PukhtoonkhwaPakistan Department of Bioinformatics and Biostatistics Shanghai Jiaotong UniversityShanghai 200240China

The present research paper presents the synthesis, characterization, biological and computational studies of 4-(benzylideneamino) benzoic acid derivatives(3a~3g). Derivatives 3a~3c displayed best antidiabetic potential with a glucose-lowering effect compared to the reference drug Glibenclamide. Biochemical parameters including plasma glucose, serum triglycerides, cholesterol, alanine amino transferase and aspartate amino transferase levels showed significant alterations in concentrations relative to the control. Similarly, the derivatives 3a, 3d and 3e displayed potent in vitro antibacterial potential. molecular docking simulations delineated that the ligands and complexes were stabilized at the active site by electrostatic and hydrophobic forces, consistent with the corresponding experimental results. In silico study of the binding pattern predicted that the synthesized ligands, 3d and 3a could serve as a potential surrogate for hit-to-lead generation and the design of novel antibacterial drugs.

关键词： antidiabetic biochemical cholesterol glibenclamide simulations

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Rapid and multimodal in vivo bioimaging of cancer cells through in situ biosynthesis of Zn＆Fe nanoclusters

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Nano Research 2017年第8期10卷 2626-2632页

作者： Tianyu Du Chunqiu Zhao Fawad ur.rehman Lanmei Lai Xiaoqi Li Yi Sun Shouhua Luo Hui Jiang matthias Selke Xuemei Wang State Key Laboratory of Bioelectronics (Chien-Shiung Wu Lab) School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China Nanjing Foreign Language School Nanjing 210096 China Laboratory of the signal and image processing School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China Department of Chemistry and Biochemistry California State University Los Angeles CA 90032 USA

Early diagnosis remains highly important for efficient cancer treatment, and hence, there is significant interest in the development of effective imaging strategies. This work reports a new multimodal bioimaging method for accurate and rapid diagnosis of cancer cells by introducing aqueous Fe^2＋ and Zn^2＋ ions into cancer cells （i.e., HeLa, U87, and HepG2 cancer cells）. We found that the biocompatible metal ions Fe^2＋ and Zn^2＋ forced the cancer cells to spontaneously synthesize fluorescent ZnO nanoclusters and magnetic Fe3O4 nanoclusters. These clusters could then be used for multimodal cancer imaging by combining fluorescence imaging with magnetic resonance imaging and computed tomography imaging. meanwhile, for normal cells （i.e., L02） and tissues, neither fluorescence nor any other obvious difference could be detected between pre- and post-injection. This multimodal bioimaging strategy based on the in situ biosynthesized Zn＆Fe oxide nanoclusters might therefore be useful for early cancer diagnosis and therapy.

关键词： multimodal imaging biosynthesized Zn&Fe oxide nanoclusters cancer diagnosis

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On-chip classification of micro-particles using laser light scattering and machine learning

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Chinese Chemical Letters 2022年第4期33卷 1885-1888页

作者： mubashir Hussain Xiaolong Liu Jun Zou Jian Yang Zeeshan Ali Hamood ur.rehman Nongyue He Jianguo Dai Yongjun Tang Innovation Practice Shenzhen PolytechnicShenzhen 518055China School of materials and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104China Department of Electrical Engineering College of EMENational University of Sciences and TechnologyH-12 IslamabadPakistan State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China

The rapid detection of microparticles exhibits a broad range of applications in the field of science and technology. The proposed method differentiates and identifies the 2 μm and 5 μm sized particles using a laser light scattering. The detection method is based on measuring forward light scattering from the particles and then classifying the acquired data using support vector machines. The device is composed of a microfluidic chip linked with photosensors and a laser device using optical fiber. Connecting the photosensors and laser device using optical fibers makes the device more diminutive in size and portable. The prepared sample containing microspheres was passed through the channel, and the surrounding photosensors measured the scattered light. The time-domain features were evaluated from the acquired scattered light, and then the SVm classifier was trained to distinguish the particle’s data. The real-time detection of the particles was performed with an overall classification accuracy of 96.06%. The optimum conditions were evaluated to detect the particles with a minimum concentration of 0.2 μg/m L. The developed system is anticipated to be helpful in developing rapid testing devices for detecting pathogens ranging between 2 μm to 10 μm.

关键词： Particle’s detection Laser light scattering Waveform features Support vector machines Lab-on-chip

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The Stability of Some Viable Stars and Electromagnetic Field

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Chinese Physics Letters 2016年第7期33卷 25-27页

作者： m.Azam S.A.mardan m.A.rehman Division of Science and Technology University of EducationTownship Campus Department of mathematics University of the Management and Technology

We examine the impact of electromagnetic field on the stability of compact stars corresponding to embedded class one metric using the concept of cracking. For this purpose, we develop the generalized hydrostatic equi- librium equation for charged perfect fluid distribution of compact stars and perturb it by means of local density perturbation scheme to check the stability of inner matter configuration. We investigate the cracking of Her X-I, PSR 1937＋21, PSR J 1614-2230, PSR J 0348＋0432 and B.X J 1856-37. We conclude that PSR J 0348＋0432 and RX J 1856-37 exhibit cracking when charge is introduced on these astrophysical objects.

关键词： of in et it on PSR The Stability of Some Viable Stars and Electromagnetic Field for

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Optimality of Solution with Numerical Investigation for Coronavirus Epidemic model

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Computers, materials & Continua 2021年第5期67卷 1713-1728页

作者： Naveed Shahid Dumitru Baleanu Nauman Ahmed Tahira Sumbal Shaikh Ali Raza muhammad Sajid Iqbal muhammad Rafiq muhammad Aziz-ur.rehman Department of mathematics and Statistics The University of LahoreLahorePakistan Department of mathematics University of Management and TechnologyLahorePakistan Department of mathematics Cankaya UniversityBalgatAnkara06530Turkey Department of medical Research China Medical University HospitalChina Medical UniversityTaichungTaiwanChina Institute of Space Sciences Magurele-BucharestRomania Department of mathematics Lahore College for Women UniversityLahorePakistan Department of mathematics National College of Business Administration and Economics LahorePakistan Department of mathematics Faculty of SciencesUniversity of Central PunjabLahorePakistan

The novel coronavirus disease,coined as COVID-19,is a murderous and infectious disease initiated from Wuhan,*** killer disease has taken a large number of lives around the world and its dynamics could not be controlled so *** this article,the spatio-temporal compartmental epidemic model of the novel disease with advection and diffusion process is projected and *** counteract these types of diseases or restrict their spread,mankind depends upon mathematical modeling and medicine to reduce,alleviate,and anticipate the behavior of disease *** existence and uniqueness of the solution for the proposed system are ***,the solution to the considered system is made possible in a well-known functions *** this purpose,a Banach space of function is chosen and the solutions are optimized in the closed and convex subset of the *** essential explicit estimates for the solutions are investigated for the associated auxiliary *** numerical solution and its analysis are the crux of this ***,the consistency,stability,and positivity are the indispensable and core properties of the compartmental models that a numerical design must *** this end,a nonstandard finite difference numerical scheme is developed to find the numerical solutions which preserve the structural properties of the continuous *** m-matrix theory is applied to prove the positivity of the *** results for the consistency and stability of the design are also presented in this *** plausibility of the projected scheme is indicated by an appropriate *** simulations are also exhibited to conclude the results.

关键词： Spatio-temporal advection diffusion explicit estimates auxiliary data m-matrix

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Conjugated microporous polymer membranes for chemical separations

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Chinese Journal of Chemical Engineering 2022年第5期35卷 1-14页

作者： Zongyao Zhou Zhen Li Lubna m.rehman Zhiping Lai Division of Physical Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Conjugated microporous polymers(CmPs) are a unique class of porous organic materials, which are constructed with π-conjugation structures leading to intrinsic micropores. The CmPs properties such as high surface area, intrinsic and rich micropores, interlocking and rigid structure, extensive π-conjugation and tunable band-gap, chemical and thermal stability, together with tailored functionalities, contribute to its abundant potential for application in fields such as photocatalysis, optoelectronics, energy storage, and chemical sensors. Recently, CmPs have gained importance in the field of membranes for chemical separation. In this review, we briefly discuss the historical development of CmPs, followed by a detailed description of the progress in state-of-the-art design, preparation, and application of CmPs in membranes. Additionally, we provide inference on the future prospects of CmPs as membranes.

关键词： Conjugated microporous polymer membrane Separation Electropolymerization Film

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