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Effect of Zn doping on electronic structure and optical properties zincblende GaN(A DFT+U insight)

Communications in Theoretical Physics 2021年第3期73卷 139-147页

作者： Muhammad Junaid Iqbal Khan Zarfishan Kanwal Masood Yousaf Hamid Ullah Javed Ahmad Abid Latif Yong-Han Shin ata ur rahman khalid Laboratory of Theoretical and Experimental Physics Department of PhysicsBahauddin Zakariya UniversityMultan(60800)Pakistan Department of Civil Engineering Faculty of Engineering and TechnologyBahauddin Zakariya UniversityMultan60800Pakistan Department of Physics Division of Science and TechnologyUniversity of EducationTownshipLahore54770Pakistan Multiscale Materials Modelling Laboratory Department of PhysicsUniversity of UlsanUlsan44610Republic of Korea

The development of new materials,having exceptional properties in comparison to existing materials is highly required for bringing advancement in electronic and optoelectronic *** this fact,we investigated structural,electronic,and optical properties of zincblende GaN doped with selected Zn concentrations(6.25%,12.50%,and 18.70%),using the first-principle calculations based on density functional theory with GGA+*** conducted the entire study using the WIEN2K *** this study,we calculated various significant parametric quantities such as cohesive energies,formation energies,bulk moduli,and lattice constants along with the study of optical and electronic properties by substituting Ga atoms with Zn atoms in 1×2×2 *** structural stability is confirmed by studying the phonon dispersion curves which suggest that Zn:GaN material is stable against the 6.25%and 18.70%Zn concentrations while for 12.50%,it shows *** Hubbard values U=0,2,4,6 eV were added to GGA and the electronic properties were improved with the U=6 *** absorption was blue shifted while the refractive index and dielectric constant were increased with increasing the Zn *** properties are enhanced due to the prime contribution of cations(Zn)3ri *** optical and electronic properties are further discussed in detail in the entire study.

关键词： density functional theory(DFT) optoelectronics Ⅲ-Ⅴsemiconductors optical properties electronic properties structural properties

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Tunable beam deflection based on plasmonic resonators mounted freestanding thermoresponsive hydrogel

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Chinese Optics Letters 2020年第6期18卷 67-70页

作者： ata ur rahman khalid Juan Liu Naeem Ullah Shiqi Jia Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

We propose and numerically demonstrate a dynamic beam deflector based on plasmonic resonator loaded thermoresponsive freestanding hydrogel that swells and collapses in water by *** this purpose,we utilize four-step phase gradients mounted on freestanding hydrated *** normal incidence,linearly orthogonal light deflects to 19.44°in the collapsed state and 14.40°in the swollen state of ***,the light deflects at a third angle of 12.29°when the solvent changes from water to *** is expected that our metadesign will provide a platform for dynamic holography,active lensing,data storage,and anticounterfeiting.

关键词： tuning beam deflector hydrogel

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Exploitation of geometric and propagation phases for spin-dependent rational-multiple complete phase modulation using dielectric metasurfaces

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Photonics Research 2022年第4期10卷 877-885页

作者： ata ur rahman khalid Fu FENG Naeem Ullah Xiaocong Yuan Michael Geoffrey Somekh Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Faculty of Engineering University of NottinghamNottingham NG72RDUK

Metasurfaces have drawn considerable attention in manipulation of electromagnetic waves due to their exotic subwavelength footprints. Regardless of immense progress of polarization-dependent flat optics, the realization of on-device switchable complete phase multiplication is still missing from design multifunctional devices. Here,by combining geometric and propagation phases, a generalized design principle is proposed that can achieve switchable integer or fractional multiple complete phase modulation in transmitted circularly cross-polarized light by switching the handedness of incident polarization. As a proof of concept, two types of spin-dependent bifunctional wavefront manipulating devices, including switchable beam splitter/beam deflector and spinto-orbital angular momentum converter designs are numerically realized. It is believed that the proposed single-cell spin-switchable rational-multiple complete-phase-modulation design principle based on combined propagation and geometric phases has great potential to underpin the development of meta-optics-based multifunctional operations in the field of integrated optics, imaging, and optical communication.

关键词： polarization phase rational

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Single-layered non-interleaved spin-insensitive metasurfaces for wavefront engineering

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Chinese Optics Letters 2023年第1期21卷 32-37页

作者： ata ur rahman khalid Naeem Ullah 韩遇 urooj Asghar 袁小聪冯甫 Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518000China College of Physics and Optoelectronics Engineering Shenzhen UniversityShenzhen 518000China Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Department of Physics Forman Christian College-UniversityLahore 54600Pakistan

Metasurfaces,two-dimensional(2D)or quasi-2D arrays of dielectric or metallic meta-atoms,offer a compact and novel platform to manipulate the amplitude,phase,and polarization of incoming wavefronts in a desired manner by engineering the geometry of *** polarization control,spin-insensitive metasurfaces have attracted significant attention due to the robustness of circular polarization against the beam misalignment and multi-path *** now,several efforts have been made to realize polarization-insensitive metasurfaces for circularly polarized(CP)wavefront manipulation;however,these metasurfaces only consider the cross-polarization channels and keep the co-polarization channels *** metasurfaces cannot be considered truly spin-insensitive,as one has to carefully choose the analyzer at ***,by combining the polarization-insensitive geometric phase and engineered propagation phase,we propose a spin-insensitive design principle based on metasurfaces that can perform identical functionality(on co-and crosspolarization channels)irrespective of the handedness of incident/transmitted *** a proof of concept,we design and numerically realize two types of spin-insensitive wavefront engineering devices:(1)spin-insensitive meta-hologram and(2)spin-insensitive beam deflector with power splitting *** proposed work is expected to open up new avenues for developing spin-independent metasurfaces-based devices.

关键词： metasurface spin-insensitivity meta-hologram beam splitter

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Electron acoustic solitary waves in unmagnetized nonthermal plasmas

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Communications in Theoretical Physics 2021年第5期73卷 80-84页

作者： Muhammad khalid Aqil Khan Mohsin Khan Daud Khan Sheraz Ahmad ata-ur-rahman Department of Physics Government Post Graduate College MardanMardan 23200Pakistan Theoretical Plasma Physics Group Department of PhysicsIslamia College Peshawar(Public Sector University)Peshawar 25120Pakistan Department of Physics Government Post Graduate College NowsheraNowshera 24100Pakistan

Electron acoustic(EA)solitary waves(SWs)are studied in an unmagnetized plasma consisting of hot electrons(following Cairns-Tsalli distribution),inertial cold electrons,and stationary *** employing a reductive perturbation technique(RPT),the nonlinear Korteweg–de Vries(KdV)equation is derived and its SW solution is ***,the effects of plasma parameters such as the nonextensivity parameter(q),the nonthermality of electrons(α),and the cold-to-hot electron density ratio(β)are investigated.

关键词： Electron acoustic solitons KdV equation Cairns-Tsalli distribution

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Role of flavonoids in plant interactions with the environment and against human pathogens-A review

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Journal of Integrative Agriculture 2019年第1期18卷 211-230页

作者： Muhammad khalid Saeed-ur-rahman Muhammad Bilal HUANG Dan-feng School of Agriculture and Biology Shanghai Jiao Tong University School of Life Science and Food Engineering Huaiyin Institute of Technology

Flavonoids are widely-distributed polyphenolic secondary metabolites with diverse biological activities in plants and benefit human health as protective dietary *** participate in plants' responses to harsh environmental conditions and effectively regulate the cell differentiation and *** plants,the majority of their functions are attributed to their strong antioxidative ***,dietary flavonoids protect the human body against free radicals which are associated with the development of cancer and *** rich in polyphenols have been used to cure various diseases because of their antibacterial,antiviral,antifungal and anticancer *** review summarizes the up-to-date research trends and development on flavonoids and its derivatives,working mechanisms and potential functions and applications particularly in relation to plant protection and human *** the end,notable concluding remarks with a close-up look at the future research directions have also been presented briefly.

关键词： flavonoids structure and composition biological activity plant protection human health antimicrobial

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Advances in fungal-assisted phytoremediation of heavy metals:A review

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Pedosphere 2021年第3期31卷 475-495页

作者： Muhammad khalid Saeed ur-rahman Danial HASSANI Kashif HAYAT Pei ZHOU Nan HUI Key Laboratory of urban Agriculture School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China Joint International Research Laboratory of Metabolic&Developmental Sciences Key Laboratory of Urban Agriculture(South)of Ministry of AgriculturePlant Biotechnology Research CenterFudan-SJTU-Nottingham Plant Biotechnology R&D CenterSchool of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China

Trace metals such as manganese(Mn),copper(Cu),zinc(Zn),and iron(Fe)are essential for many biological processes in plant life ***,in excess,they can be toxic and disrupt plant growth processes,which is economically undesirable for crop *** this reason,processes such as homeostasis and transport control of these trace metals are of constant interest to scientists studying heavily contaminated *** is a promising cleanup technology for soils polluted with heavy ***,this technique has some disadvantages,such as the slow growth rate of metal-accumulating plant species,low bioavailability of heavy metals,and long duration of ***-assisted phytoremediation is a promising strategy for hyperaccumulating,detoxifying,or remediating soil *** mycorrhizal fungi(AMF)are found in association with almost all plants,contributing to their healthy performance and providing resistance against environmental *** colonize plant roots and extend their hyphae to the rhizosphere region,assisting in mineral nutrient uptake and regulation of heavy metal *** fungi exist in every healthy plant tissue and provide enormous services to their host plants,including growth enhancement by nutrient acquisition,detoxification of heavy metals,secondary metabolite regulation,and enhancement of abiotic/biotic stress *** aim of the present work is to review the recent literature regarding the role of AMF and endophytic fungi in plant heavy metal tolerance in terms of its regulation in highly contaminated conditions.

关键词： arbuscular mycorrhizal fungi bioremediation endophytic fungi environmental stress metal tolerance microbe plant transporter soil contaminant

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Mutualistic fungus Piriformospora indica modulates cadmium phytoremediation properties of host plant via concerted action of enzymatic and non-enzymatic biochemicals

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Pedosphere 2022年第2期32卷 256-267页

作者： Muhammad khalid Saeed ur-rahman Haoxin TAN Lantian SU Pei ZHOU Nan HUI Key Laboratory of urban Agriculture School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China Joint International Research Laboratory of Metabolic&Developmental Sciences Key Laboratory of Urban Agriculture(South)Ministry of AgriculturePlant Biotechnology Research CenterFudan-SJTU-Nottingham Plant Biotechnology R&D CenterSchool of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station Ministry of Science and TechnologyMinistry of Education800 Dongchuan Rd.Shanghai 200240China Shanghai urban Forest Ecosystem Research Station National Forestry and Grassland Administration800 Dongchuan Rd.Shanghai 200240China

Soils and ecosystems contaminated with cadmium (Cd) threaten human health and adversely affect morphological,physiological,and biochemical parameters of *** symbiotic association of endophytic fungi with their host plants is the best strategy to improve various plant characteristics and remediate soils polluted with heavy metal(loid)s (HMs).Being a well-known plant growth-promoting fungus,Piriformospora indica confers resistance against a number of abiotic stresses,including HM *** pot experiment explored the potential and ameliorative effects of *** on Artemisia annua *** treated with different concentrations (0,40,80,and 120 mg kg-1) of *** with *** significantly increased plant performance,especially by enhancing chlorophyll concentration and water potential and by decreasing electrolytic leakage,when compared with un-inoculated plants,despite the high Cd ***,*** enhanced antioxidant enzyme activities,thereby reducing the drastic effects of Cd in inoculated *** addition,*** accumulated Cd in the roots of colonized plants,as revealed by atomic absorption spectroscopy,and restricted Cd translocation to aerial ***,*** showed in vitro resistance (up to a certain level) to Cd stress;however,fungus growth was inhibited at very high Cd concentrations,proving it an excellent candidate for use as a potential phytoremediator in fields affected by Cd *** transcriptional analysis showed that the signaling genes and artemisinin and flavonoid biosynthetic pathway genes were significantly upregulated in ***-co-cultivated plants when compared with un-inoculated plants,suggesting a fine collaboration between primary and secondary metabolisms to modulate resistance capacity and to enhance the phytoremediation capability of *** against Cd toxicity.

关键词： Artemisia annua defence-related gene endophytic fungi fungal inoculation heavy metal stress plant growth promotion soil contamination transcripts

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Diversity and versatile functions of metallothioneins produced by plants:A review

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Pedosphere 2020年第5期30卷 577-588页

作者： SAEED-ur-rahman Muhammad KHALD Nan HUI Sadaf-Ilyas KAYANI Kexuan TANG Joint International Research Laboratory of Metabolic&Developmental Sciences Key Laboratory of Urban Agriculture(South)o f Ministry of AgriculturePlant Biotechnology Research CenterFudan-SJTU-Nottingham Plant Biotechnology R&D CenterSchool of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240(China) Key Laboratory of urban Agriculture School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240(China)

Metal ions are essential for plant growth and development,but in excess,these compounds can become highly *** have adopted numerous ways to maintain metal homeostasis while mitigating adverse effects of excess metal ions,including phytochelatin and the metal-chelating proteins metallothioneins(MTs).A family of cysteine(Cys)-rich,intracellular,and low-molecular-weight(4-8 kDa)MTs are proteins found in nearly all phyla including plants,animals,and fungi,and they have the potential to scavenge reactive oxygen species and detoxify toxic metals including copper,cadmium,and *** on their Cys numbers and residues,MTs have been categorized into three major *** I MTs,which have highly conserved Cys residues,are found in animals,while class II MTs,with less conserved Cys residues,are present in plants and are classified further into four *** III MTs include phytochelatins,a group of enzymatically synthesized Cys-rich *** MTs have been an area of interest for five decades with extensive studies,which have been facilitated by advancements in instrumental techniques,protein science,and molecular biology ***,we reviewed current advances in our understanding of the regulation of MT biosynthesis,their expression,and their potential roles in the alleviation of abiotic stresses(i.e.,drought,salinity,and oxidative stresses)and heavy metal detoxification and homeostasis.

关键词： abiotic stress biosynthesis gene expression heavy metals reactive oxygen species enzyme regulation

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Intelligent Software-Defined Network for Cognitive Routing Optimization Using Deep Extreme Learning Machine Approach

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Computers, Materials & Continua 2021年第4期67卷 1269-1285页

作者： Fahd Alhaidari Sultan H.Almotiri Mohammed A.Al Ghamdi Muhammad Adnan Khan Abdur Rehman Sagheer Abbas khalid Masood Khan Atta-ur-rahman Department of Computer Information System College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityDammam31441Saudi Arabia Department of Computer Science Umm Al-Qura UniversityMakkah City715Saudi Arabia Department of Computer Science Lahore Garrison UniversityLahore54792Pakistan School of Computer Science NCBA&ELahore54000Pakistan Department of Computer Science College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityDammam31441Saudi Arabia

In recent years,the infrastructure,instruments,and resources of network systems are becoming more complex and heterogeneous,with the rapid development of current internet and mobile communication *** order to efficaciously prepare,control,hold and optimize networking systems,greater intelligence needs to be ***,due to the inherently dispensed characteristic of conventional networks,Machine Learning(ML)techniques are hard to implement and deployed to govern and operate ***-Defined Networking(SDN)brings us new possibilities to offer intelligence in the ***’s characteristics(e.g.,logically centralized control,global network view,software-based site visitor analysis,and dynamic updating of forwarding rules)make it simpler to apply machine learning *** perspectives of fiber-optic communications including fiber nonlinearity coverage,optical performance checking,cognitive shortcoming detection/anticipation,and arranging and improvement of softwaredefined networks are examined in Machine Learning(ML)*** research paper has presented an imaginative framework concept called Intelligent Software Defined Network(ISDN)for Cognitive Routing Optimization(CRO)using Deep Extreme Learning Machine(DELM)approach(ISDN-CRO-DELM)in light of the new challenges in the development and operation of communication systems,and capturing motivation from how living creatures deal with difficulty and *** proposed methodology develops around the planned applications of progressive DELM methods and,specifically,probabilistic generative models for framework wide learning,demonstrating,improvement,and information ***,ISDN-CRO-DELM,suggest to integrate this learning framework with the ISDN for CRO and reconfiguration approaches at the system *** 2019a is used for DELM simulation and superior results show the effectiveness of the proposed framework.

关键词： SDN DELM machine learning cognition

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