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Sustainable ammonia synthesis:An in-depth review of non-thermal plasma technologies

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Journal of Energy Chemistry 2024年第9期96卷 1-38页

作者： Vahid shahed Gharahshiran Ying Zheng Department of Chemical and Biochemical Engineering Thompson Engineering BuildingWestern UniversityLondonON N6A 5B9Canada

Ammonia serves both as a widely used fertilizer and environmentally friendly energy source due to its high energy density,rich hydrogen content,and emissions-free ***,it offers convenient transportation and storage as a hydrogen *** dominant method used for large-scale ammonia production is the Haber-Bosch process,which requires high temperatures and pressures and is ***,non-thermal plasma offers an eco-friendly alternative for ammonia synthesis,gaining significant *** enables ammonia production at lower temperatures and pressures using plasma *** review provides insights into the catalyst and reactor developments,which are pivotal for promoting ammonia efficiency and addressing existing *** first,the reaction kinetics and mechanisms are introduced to gain a comprehensive understanding of the reaction pathways involved in plasma-assisted ammonia ***,the enhancement of ammonia synthesis efficiency is discussed by developing and optimizing plasma reactors and effective *** effect of other feeding sources,such as water and methane,instead of hydrogen is also ***,the challenges and possible solutions are outlined to facilitate energy-saving and enhance ammonia efficiency in the future.

关键词： Nitrogen fixation Ammonia synthesis NH_(3) Non-thermal plasma Ni Ru catalyst

A Review of Privacy and Security of Edge Computing in Smart Healthcare Systems: Issues, Challenges, and Research Directions

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Tsinghua Science and Technology 2024年第4期29卷 1152-1180页

作者： Ahmad Alzu’bi Ala’a Alomar shahed Alkhaza’leh Abdelrahman Abuarqoub Mohammad Hammoudeh Department of Computer Science Jordan University of Science and TechnologyIrbid 22110Jordan Cardiff School of Technologies Cardiff Metropolitan UniversityCardiff CF52YBUK Department of Information and Computer Science King Fahd University of Petroleum and MineralsDhahran 31261Kingdom of Saudi Arabia

The healthcare industry is rapidly adapting to new computing environments and technologies. With academics increasingly committed to developing and enhancing healthcare solutions that combine the Internet of Things (IoT) and edge computing, there is a greater need than ever to adequately monitor the data being acquired, shared, processed, and stored. The growth of cloud, IoT, and edge computing models presents severe data privacy concerns, especially in the healthcare sector. However, rigorous research to develop appropriate data privacy solutions in the healthcare sector is still lacking. This paper discusses the current state of privacy-preservation solutions in IoT and edge healthcare applications. It identifies the common strategies often used to include privacy by the intelligent edges and technologies in healthcare systems. Furthermore, the study addresses the technical complexity, efficacy, and sustainability limits of these methods. The study also highlights the privacy issues and current research directions that have driven the IoT and edge healthcare solutions, with which more insightful future applications are encouraged.

关键词： edge computing fog computing data privacy healthcare systems intelligent edges

A Comprehensive Survey for Privacy-Preserving Biometrics: Recent Approaches, Challenges, and Future Directions

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Computers, Materials & Continua 2024年第2期78卷 2087-2110页

作者： Shahriar Md Arman Tao Yang Shahadat shahed Alanoud AlMazroa Afraa Attiah Linda Mohaisen School of Computer Science and Technology Zhejiang Gongshang UniversityHangzhou310018China School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou310018China College of Computer and Information Sciences Princess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Faculty of Computing and Information Technology King Abdulaziz UniversityJeddah21589Saudi Arabia

The rapid growth of smart technologies and services has intensified the challenges surrounding identity authenti-cation *** credentials are increasingly being used for verification due to their advantages over traditional methods,making it crucial to safeguard the privacy of people’s biometric data in various *** paper offers an in-depth exploration for privacy-preserving techniques and potential threats to biometric *** proposes a noble and thorough taxonomy survey for privacy-preserving techniques,as well as a systematic framework for categorizing the field’s existing *** review the state-of-the-art methods and address their advantages and limitations in the context of various biometric modalities,such as face,fingerprint,and eye *** survey encompasses various categories of privacy-preserving mechanisms and examines the trade-offs between security,privacy,and recognition performance,as well as the issues and future research *** aims to provide researchers,professionals,and decision-makers with a thorough understanding of the existing privacy-preserving solutions in biometric recognition systems and serves as the foundation of the development of more secure and privacy-preserving biometric technologies.

关键词： Biometric modalities biometric recognition biometric security privacy-preserving security threats

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数字营销策略对消费者购买意愿的影响研究

世界经济探索 2024年第3期13卷 282-290页

作者： Mehmud Md shahed 常州大学商学院江苏常州

数字营销是当今众多企业和公司所采用的重要战略,提供了独特的跨地域覆盖范围和参与潜力。本文主要研究数字营销策略对孟加拉国消费者购买意愿的影响因素。通过梳理、总结相关文献,本研究进行提出假设(H1~H5)主要探讨电子邮箱营销、网... 详细信息

数字营销是当今众多企业和公司所采用的重要战略,提供了独特的跨地域覆盖范围和参与潜力。本文主要研究数字营销策略对孟加拉国消费者购买意愿的影响因素。通过梳理、总结相关文献,本研究进行提出假设(H1~H5)主要探讨电子邮箱营销、网络公关营销、内容营销、社交媒体营销、联盟营销因素对消费者购买意愿方面的重要性。本文的数据来源于问卷调查,收集数据之后通过SPSS软件进行分析。结果表明,社交媒体营销、电子邮箱营销、网络公关营销、内容营销因素对孟加拉国消费者的购买意愿具有重要的影响力。通过研究数字营销对孟加拉国消费者购买行为的影响,以帮助企业加深理解并针对适合孟加拉国市场背景的数字营销策略进行战略改进。这有助于数字营销活动的不断改进和完善,最终使企业能够更好地满足孟加拉国消费者不断变化的需求和偏好。Digital marketing is an important strategy adopted by many businesses and companies today, providing unique cross-regional coverage and engagement potential. This paper mainly studies the factors that influence the purchase intention of Bangladeshi consumers through digital marketing strategies. By combing and summarizing relevant literature, this study proposes hypotheses (H1~H5) to explore the importance of email marketing, online public relations marketing, content marketing, social media marketing, and affiliate marketing factors on consumer purchase intention. The data in this paper comes from a questionnaire survey, and the data is analyzed using SPSS software after collection. The results show that social media marketing, email marketing, online public relations marketing, and content marketing factors have an important influence on the purchase intention of Bangladeshi consumers. By studying the impact of digital marketing on the purchasing behavior of Bangladeshi consumers, it helps companies to deepen their understanding and make strategic improvements to digital marketing strategies that are suitable for the Bangladeshi market context. This will help the continuous improvement and perfection of digital marketing activities, and ultimately enable companies to better meet the changing needs and preferences of Bangladeshi consumers.

关键词：数字营销购买意愿消费者孟加拉国达卡

Potassium ferro-cyanide trihydrate complex catalyzed one-pot synthesis of 2-phenylimidazo[4,5-f][1,10] phenanthroline

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Chinese Chemical Letters 2011年第7期22卷 793-796页

作者： Syed shahed Ali Organic Laboratory Department of Sir Sayyed CollegeDr.Babasaheb Ambedkarb Marathwada UniversityAurangabad 431001India

Various 2-phenylimidazo [4,5-f] [1,10] phenanthrolines were synthesized from potassium ferro-cyanide trihydrate （KFCT） complex catalyzed three component reaction of 1,10-phenanthroline-5,6-dione, aromatic aldehydes and ammonium acetate at room temperature in excellent isolated yield. This is a simple and straight forward, high yielding, not involving any hazardous or expensive catalyst method.

关键词： 2-Phenylimidazo [4,5-f] phenanthrolines Aromatic aldehyde K4[Fe(CN)6]·3H2O Ammonium acetate

Deterministic and Stochastic Fractional Order Model for Lesser Date Moth

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Computer Systems Science & Engineering 2022年第2期40卷 749-764页

作者： Moustafa El-shahed Asmaa M.Al-Dububan Department of Mathematics Unaizah College of Sciences and ArtsQassim UniversityP.O.Box 3771Unaizah51911Saudi Arabia Department of Mathematics Buraydah College of Sciences and ArtsQassim UniversityP.O.Box 1162Buraydah51431Saudi Arabia

In this paper,a deterministic and stochastic fractional order model for lesser date moth(LDM)using mating disruption and natural enemies is proposed and *** interaction between LDM larvae,fertilized LDM female,unfertilized LDM female,LDM male and the natural enemy is *** order to clarify the characteristics of the proposed deterministic fractional order model,the analysis of existence,uniqueness,non-negativity and boundedness of the solutions of the proposed fractional-order model are *** addition,some sufficient conditions are obtained to ensure the local and global stability of equilibrium *** occurrence of local bifurcation near the equilibrium points is investigated with the help of Sotomayor’s *** simulations are conducted to illustrate the properties of the proposed fractional order model with respect to the intrinsic growth rate of the LDM larvae,natural enemy’s mortality rate,predation rate,sex pheromone trap parameter,fractional order and environmental *** impact of mating disruption on lesser date moth is ***,a numerical approximation method is developed for the proposed stochastic fractional-order model.

关键词： Lesser date moth stochastic stability natural enemies Sotomayor’s theorem mating disruption

Repeated exposure of fluazinam fungicides affects gene expression profiles yet carries no costs on a nontarget pest

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Insect Science 2022年第5期29卷 1373-1386页

作者： shahed Saifullah Aigi Margus Maaria Kankare Leena Lindström Department of Biological and Environmental Science University of JyväskyläJyväskyläFinland

Fungicides are used to control pathogenic fungi of crop species,but they have also been shown to alter behavioral,life history and fitness related traits of nontarget ***,we tested the fungicide effects on feeding behavior,survival and physiology of the nontarget pest insect,the Colorado potato beetle(CPB)(Leptinotarsa decemlineata).Feeding behavior was studied by a choice test of adult beetles,which were allowed to choose between a control and a fungicide(fluazinam)treated potato *** survival was recorded after 24 and 72 h exposure to control and fungicide-treated leaves with 2 different *** adults did not show fungicide avoidance ***,survival of the larvae was not affected by the exposure to ***,to understand the effects of fungicides at the physiological level(gene expression),we tested whether the larval exposure to fungicide alter the expression of 5 metabolic pathway and stress associated *** concentration and 72-h exposure caused upregulation of 1 cytochrome P450(CYP9Z14v2)and 1 insecticide resistance gene(Ldace1),whereas metabolic detoxification gene(Ugt1)was *** 24-h exposure,highest concentration caused downregulation of another common detoxification gene(Gs),while both exposure times to lowest concentration caused upregulation of the Hsp70 stress tolerance *** these overall effects,there was a considerable amount of variation among different families in the gene expression *** though the behavioral effects of the fungicide treatments were minor,the expression level differences of the studied genes indicate changes on the metabolic detoxifications and stress-related pathways.

关键词： behavior fluazinam gene expression Leptinotarsa decemlineata metabolic detoxification nontarget animal

Deterministic and Stochastic Fractional-Order Hastings-Powell Food Chain Model

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Computers, Materials & Continua 2022年第2期70卷 2277-2296页

作者： Moustafa El-shahed Asmaa M.Al-Dububan Department of Mathematics Unaizah College of Sciences and ArtsQassim UniversityUnaizah51911Saudi Arabia Department of Mathematics Buraydah College of Sciences and ArtsQassim UniversityBuraydah51431Saudi Arabia

In this paper,a deterministic and stochastic fractional-order model of the tri-trophic food chain model incorporating harvesting is proposed and *** interaction between prey,middle predator and top predator population is *** order to clarify the characteristics of the proposed model,the analysis of existence,uniqueness,non-negativity and boundedness of the solutions of the proposed model are *** sufficient conditions that ensure the local and global stability of equilibrium points are *** using stability analysis of the fractional-order system,it is proved that if the basic reproduction number R_(0)<1,the predator free equilibrium point E_(1) is globally asymptotically *** occurrence of local bifurcation near the equilibrium points is investigated with the help of Sotomayor’s *** numerical examples are given to illustrate the theoretical *** impact of harvesting on prey and themiddle predator is *** conclude that harvesting parameters can control the dynamics of the middle predator.A numerical approximation method is developed for the proposed stochastic fractional-order model.

关键词： Food chain model global dynamics stability stochastic Hastings-Powell model harvesting

A numerical study on heat transfer enhancement and design of a heat exchanger with porous media in continuous hydrothermal flow synthesis system

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Chinese Journal of Chemical Engineering 2017年第10期25卷 1352-1359页

作者： Pedram Karimi Pour-Fard Ebrahim Afshari Masoud Ziaei-Rad shahed Taghian-Dehaghani Department of Mechanical Engineering Faculty of Engneering University of Isfahan Hezar Jerib Ave. Isfahan 81746-73441 Iran

The aim of this study is to use a new configuration of porous media in a heat exchanger in continuous hydrothermal flow synthesis(CHFS)system to enhance the heat transfer and minimize the required length of the heat *** this purpose,numerous numerical simulations are performed to investigate performance of the system with porous ***,the numerical simulation for the heat exchanger in CHFS system is validated by experimental ***,porous media is added to the system and six different thicknesses for the porous media are examined to obtain the optimum thickness,based on the minimum required length of the heat ***,by changing the flow rate and inlet temperature of the product as well as the cooling water flow rate,the minimum required length of the heat exchanger with porous media for various inlet conditions is *** investigations indicate that using porous media with the proper thickness in the heat exchanger increases the cooling rate of the product by almost 40% and reduces the required length of the heat exchanger by approximately 35%.The results also illustrate that the most proper thickness of the porous media is approximately equal to 90% of the product tube's *** of this study lead to design a porous heat exchanger in CHFS system for various inlet conditions.

关键词： Continuous hydrothermal flow synthesis Heat exchanger Heat transfer enhancement Porous media Numerical simulation