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马尔代夫泛在化教育的演变:实践、挑战和问题

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云南开放大学学报 2024年第1期26卷 5-9页

作者：埃西姆·阿卜杜勒·萨塔尔 Dean Faculty of Arts The Maldives National University

Learning and teaching have been undergoing transformational changes in the past 100 years,each change promising a richer and more meaningful interaction of learners and instructors. Beginning from the limitations of correspondence courses and distance education, remote learning has trended through computerassisted instruction(CAI), e-learning, m-learning, and now ubiquitous or u-learning. Some forms of this type of education have been renamed or repackaged in multiple forms of instruction including hybrid and flexible learning. More recently, u-learning or ubiquitous learning has been gaining currency and *** article outlines the development of education other than face-to-face learning and teaching in the context of the Maldives to disentangle its practices, challenges, and issues. Some of these issues are likely to impact u-learning and its descendent and off-shoot modes.

关键词： likely CAI 泛在化

Correlation-induced coherence and its use in detecting quantum phase transitions

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 29-37页

作者： Ming-Ming Du Abdul sattar Khan Zhao-Yi Zhou Da-Jian Zhang Department of Physics Shandong UniversityJinan 250100China

The past two decades have witnessed a surge of interest in exploring correlation and coherence measures to investigate quantum phase transitions(QPTs). Here, motivated by the continued push along this direction, we propose a measure which is built upon the so-called degree of coherence, and advocate using the susceptibility of our measure to detect QPTs. We show that our measure can capture both the notions of coherence and correlations exhibited in bipartite states and therefore represents a hybrid of these two notions. Through examining the XXZ model and the Kitaev honeycomb model, we demonstrate that our measure is favorable for detecting QPTs in comparison to many previous proposals.

关键词： correlation measures coherence measures quantum phase transitions

Torsional postbuckling characteristics of functionally graded graphene enhanced laminated truncated conical shell with temperature dependent material properties

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Theoretical & Applied Mechanics Letters 2023年第4期13卷 272-279页

作者： Hamad M.Hasan Saad S.Alkhfaji sattar A.Mutlag Department of Mechanical Engineering University of AnbarRamadi 31001Iraq Department of Medical Instrumentation Engineering Ashur University CollegeBaghdad 10044Iraq

Buckling and postbuckling characteristics of laminated graphene-enhanced composite(GEC)truncated conical shells exposed to torsion under temperature conditions using finite element method(FEM)simulation are presented in this *** the thickness direction,the GEC layers of the conical shell are ordered in a piece-wise arrangement of functionally graded(FG)distribution,with each layer containing a variable volume fraction for graphene *** calculate the properties of temperaturedependent material of GEC layers,the extended Halpin-Tsai micromechanical framework is *** FEM model is verified via comparing the current results obtained with the theoretical estimates for homogeneous,laminated cylindrical,and conical shells,the FEM model is *** computational results show that a piece-wise FG graphene volume fraction distribution can improve the torque of critical buckling and torsional postbuckling ***,the geometric parameters have a critical impact on the stability of the conical ***,a temperature rise can reduce the crucial torsional buckling torque as well as the GEC laminated truncated conical shell’s postbuckling strength.

关键词： Torsional postbuckling Graphene enhanced composite Functionally graded graphene Finite element method Conical shell

Cryptosporidium parvum oocyst directed assembly of gold nanoparticles and graphene oxide

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 608-615,F0004页

作者： Sona Jain Zhicheng Huang Brent R. Dixon Syed sattar Juewen Liu Department of Chemistry Waterloo Institute for NanotechnologyUniversity of WaterlooOntarioN2L3G1Canada Bureau of Microbial Hazards Food DirectorateHealth CanadaOntarioK1A 0K9Canada Faculty of Medicine University of OttawaOntarioK1H 8M5Canada

Understanding the interactions between inorganic nanomaterials and biological species is an important topic for surface and environmental chemistry. In this work, we systematically studied the oocysts of Cryptosporidium pa r v u m as a model protozoan parasite and its interaction with gold nanoparticles (AuNPs) and graphene oxide (GO). The as-prepared citrate-capped AuNPs adsorb strongly on the oocysts leading to a vivid color change. The adsorption of the AuNPs was confirmed by transmission electron microscopy. Heat treatment fully inhibited the color change, indicating a large change of surface chemistry of the oocysts that can be probed by the AuNPs. Adding proteases such as trypsin and proteinase K partially inhibited the color change. DNA-capped AuNPs, on the other hand, could not be adsorbed by the oocysts. GO was found to wrap around the oocysts forming a conformal shell reflecting the shape of the oocysts. Both citratecapped AuNPs and GO compromised the membrane integrity of the oocysts as indicated by the propidium iodide staining experiment, and they may be potentially used for inactivating the oocysts. This is the first example of using nanomaterials to probe the surface of the oocysts, and it suggests the possibility of using such organisms to template the assembly of nanomaterials.

关键词： nanomaterials toxicology water biosensors

Changes in Anatomical Features and Protein Pattern of Sunflower Partially Resistant and Susceptible Lines During Infection By Virulence Factors of Sclerotinia Sclerotiorum

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Phyton-International Journal of Experimental Botany 2019年第2期88卷 149-159页

作者： Maryam Monazzah sattar Tahmasebi Enferadi Zohre Rabiei Alessandro Mattiello Department of Plant Molecular Biotechnology Institute of Agricultural BiotechnologyNational Institute of Genetic Engineering and BiotechnologyTehranPO Box 14925/16Iran Department of Agri-Food Animal and Environmental SciencesUniversity of UdineUdineItaly.

Helianthus annuus *** an oil seed crop is widely grown throughout the *** of the most destructive diseases of sunflower is stem rot caused by Sclerotinia *** acid is the major virulence factor of this necrotrophic *** is important to further investigate plant responses to this non-specific ***,in the present study,we compared the patterns of total soluble proteins and xylem morphology of partially resistant and susceptible sunflower lines after treatment with Sclerotinia culture *** basal stems of both lines were treated with 40 mM oxalic acid(pH 3.7)of fungus culture filtrate and samples were collected at 24,48 and 72 hours post *** SDS-PAGE protein pattern new protein bands appeared in both lines after *** observations suggest induction of stress-related proteins upon culture filtrate *** identities of these new proteins need to be more clarify in future *** changes in xylem morphology and degree of lignification of both lines was studied by light microscopy and microtome sectioning techniques after treatment with *** culture *** investigations revealed changes in xylem diameter and xylem lignification of treated lines at various time *** lignin deposition in xylem vessels of partially resistant line has been observed after *** addition,the size of xylem vessels in partially resistant line has been sharply decreased upon pathogen filtrate *** results of this study will help us gain a more complete understanding of resistance mechanisms to this cosmopolitan and devastating pathogen.

关键词： Microtome Xylem Helianthus annuus Sclerotinia sclerotiorum Stem rot

Inducing opto-electronic and spintronic trends in bilayer h-BN through TMO3 clusters incorporation: Ab-initio study

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Chinese Physics B 2019年第11期28卷 284-294页

作者： Irfan Ahmed Muhammad Rafique Mukhtiar Ahmed Mahar Abdul sattar Larik Mohsin Ali Tunio Yong Shuai Mehran University of Engineering and Technology SZABCampusKhairpur Mirs’Pakistan School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Mehran University of Engineering and Technology JamshoroSindhPakistan

The band structure, magnetism, charge distribution, and optics parameters of TMO3–h-BN hybrid systems are investigated by adopting first-principles study(FPS) calculations. It is observed that the TMO3 clusters add finite magnetic moments to bilayer h-BN(BL/h-BN), thereby making it a magnetic two-dimensional(2D) material. Spin-polarized band structures for various TMO3–BL/h-BN hybrid models are calculated. After the incorporation of TMO3, BL/h-BN is converted into semimetal or conducting material in spin up/down bands, depending on the type of impurity cluster present in BL/h-BN lattice. Optics parameters are also investigated for the TMO3–BL/h-BN complex systems. The incorporation of TMO3 clusters modifies the absorption and extinction coefficient in visible range, while static reflectivity and refraction parameter increase. It can be surmised that the TMO3 substitution in BL/h-BN is a suitable technique to modify its physical parameters thus making it functional for nano/opto-electronic applications, and an experimental approach can be adapted to reinforce the outcomes of this study.

关键词： bilayer h-BN band structure density of states magnetic moments optics

Co-optimization of integrated energy systems in the presence of renewable energy,electric vehicles,power-to-gas systems and energy storage systems with demand-side management

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Clean Energy 2023年第2期7卷 426-435页

作者： Mahroo sattar Mahmoud Samiei Moghaddam Azita Azarfar Nasrin Salehi Mojtaba Vahedi Department of Electrical Engineering Shahrood BranchIslamic Azad UniversityShahroodIran Department of Electrical Engineering Damghan BranchIslamic Azad UniversityDamghanIran Department of Basic Sciences Shahrood BranchIslamic Azad UniversityShahroodIran

With the widespread penetration of renewable energy sources and energy storage systems,the problem of energy management has received increasing *** of the systems that network owners consider today is the power-to-gas(P2G)*** system causes surplus electricity generated from renewable energy resources or batteries in the network to be converted into gas and sold to the gas *** reasons for the existence of gas distributed generation resources and P2G systems cause the two power and gas networks to *** management and profit making considering these two networks,as a co-optimization of integrated energy systems,is a topic that has been discussed in this study to achieve the best optimal *** the production of renewable energy resources and the purchase price of energy are uncertain,a scenario-based method has been chosen for ***-side management is also one of the important problems in optimal operation of the electricity network,which can have a significant impact on reducing peak load and increasing *** this paper,a mixed-integer quadratic programming model for co-optimization of electric distribution and gas networks in the presence of distributed generation resources,P2G systems,storage facilities,electric vehicles and demand-side management is *** 33-bus distribution network is intended to analyse the proposed *** results of different scenarios show the efficiency of the proposed *** key points are deduced from the obtained results:(i)demand-side management is able to reduce the peak load of the network,(ii)the presence of renewable resources and batteries can cause the network to convert excess electricity into gas and sell it to the gas network in the market and(iii)distributed generation can reduce the purchase of energy from the upstream network and cause a 36% reduction in the cost function.

关键词： optimization linear programming integrated systems power-to-gas scenario-based model electricity distribution

Verification of Authentication Protocols for Epistemic Goals via SAT Compilation

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Journal of Computer Science & Technology 2006年第6期21卷 932-943页

作者：苏开乐陈清亮 Abdul sattar 岳伟亚吕关锋郑锡忠 Department of Computer Science Sun Yat-Sen University Guangzhou 510275 P.R China Institute for Integrated and Intelligent Systems Griffth University Brisbane Qld 4111 Australia College of Computer Science and Technology Beijing University of Technology Beijing 100022 P.R. China Department of Computer Science Brandenburg University of Technology Cottbus 03036 Germany

This paper introduces a new methodology for epistemic logic, to analyze communication protocols that uses knowledge structures, a specific form of Kripke semantics over hostile networks. The paper particularly focuses on automatic verification of authentication protocols. Our approach is based on the actual definitions of a protocol, not on some difficultto-establish justifications. The proposed methodology is different from many previous approaches to automatic verification of security protocols in that it is justification-oriented instead of falsification-oriented, i.e., finding bugs in a protocol. The main idea is based on observations： separating a principal executing a run of protocol from the role in the protocol, and inferring a principal＇s knowledge from the local observations of the principal. And we show analytically and empirically that this model can be easily reduced to Satisfiability （SAT） problem and efficiently implemented by a modern SAT solver.

关键词： authentication protocol formal verification knowledge structure SAT

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核桃焦叶病诱导的形态响应

经济林研究 2024年第3期42卷 188-196页

作者：郭桐阿地力·沙塔尔王世伟郝洪龙赵莎莎张翠芳新疆农业大学林学与风景园林学院新疆乌鲁木齐830052

【目的】探明焦叶病发生进程中核桃Juglans regia的形态学变化。【方法】以新疆维吾尔自治区阿克苏地区核桃主栽品种‘温185’Juglans regia‘Wen185’1年生结果枝为研究对象,定量测量核桃焦叶病发生进程中1年生结果枝在枝条长度、基径... 详细信息

【目的】探明焦叶病发生进程中核桃Juglans regia的形态学变化。【方法】以新疆维吾尔自治区阿克苏地区核桃主栽品种‘温185’Juglans regia‘Wen185’1年生结果枝为研究对象,定量测量核桃焦叶病发生进程中1年生结果枝在枝条长度、基径生长速率和木质部茎比导水率;显微定性观察核桃焦叶病发生进程中叶片、叶柄及枝条的结构变化特征。【结果】焦叶病严重影响‘温185’核桃1年生结果枝的生长和结构。感病枝长度增量(健康枝条63.42 mm,感病枝条48.68 mm)、基径增量(健康枝条2.98 mm,感病枝条2.17 mm)及木质部导水率(健康枝条9.00 kg·m^(-1)·s^(-1)·MPa^(-1)、感病枝条2.55 kg·m^(-1)·s^(-1)·MPa^(-1))显著降低(P<0.05)。叶片解剖结构的多重比较结果显示,随着叶片焦叶病病级的升高,叶片、栅栏组织、海绵组织以及上表皮的厚度均呈现下降趋势。健康叶片细胞结构完好,无空洞和表皮损伤。感病叶片叶肉细胞破裂、海绵组织出现空洞、游离细胞破损。随叶片焦叶病病级的升高,叶片表皮细胞扭曲变形,严重时上表皮严重扭曲,海绵组织空洞增多,叶肉细胞破损加剧,下表皮出现断裂。同时感病叶片叶柄纹孔膜表面变得粗糙,出现白色颗粒物,并在严重情况下出现破裂。此外,感病枝条木质部螺纹导管内出现颗粒物和絮状结构,导致导管堵塞,影响水分和养分运输。【结论】核桃焦叶病发病过程中,‘温185’核桃1年生结果枝枝条生长受阻,叶片结构受损,木质部螺纹导管堵塞,导致木质部茎比导水率降低。

关键词：核桃焦叶病生长木质部茎比导水率叶片结构