Pub Date : 2023-12-22DOI: 10.3390/encyclopedia4010002
Giulia Tripodi, Giuseppe Ruta
In young Maxwell’s eyes, electricity, magnetism and fluid mechanics present analogies that let the first be mathematically grasped in a unitary way similarly to the latter. This entry sketches the first steps of James Clerk Maxwell’s unitary view of electromagnetism and fluid mechanics, with long-lasting effects on understanding the physical world. In his very first paper on the subject, Maxwell interpreted Faraday’s concept of lines of force of both electricity and magnetism as filaments of a flowing fluid. That is, Maxwell suggested to unify the previously distinct fields of electricity and magnetism, considering them as different aspects of the same entity, the ‘electromagnetic field’, which is mathematically described by four partial differential equations. In the literature there are several comprehensive works on Maxwell’s mature exposition of his theory; however, the aim of this entry contribution is rather more limited. Indeed, it is restricted to examining the contributions of Maxwell’s first paper towards developing the idea of electric current as the motion of an incompressible fluid. Thus, this entry highlights the strong connections of Maxwell’s epistemological view with the ‘mechanistic’ approach of the time to every aspect of physical phenomenology. For this purpose, this entry mentions some historical context surrounding the emergence of Maxwell’s innovative concepts.
{"title":"Maxwell’s Early Unitary View of Electricity and Fluid Mechanics","authors":"Giulia Tripodi, Giuseppe Ruta","doi":"10.3390/encyclopedia4010002","DOIUrl":"https://doi.org/10.3390/encyclopedia4010002","url":null,"abstract":"In young Maxwell’s eyes, electricity, magnetism and fluid mechanics present analogies that let the first be mathematically grasped in a unitary way similarly to the latter. This entry sketches the first steps of James Clerk Maxwell’s unitary view of electromagnetism and fluid mechanics, with long-lasting effects on understanding the physical world. In his very first paper on the subject, Maxwell interpreted Faraday’s concept of lines of force of both electricity and magnetism as filaments of a flowing fluid. That is, Maxwell suggested to unify the previously distinct fields of electricity and magnetism, considering them as different aspects of the same entity, the ‘electromagnetic field’, which is mathematically described by four partial differential equations. In the literature there are several comprehensive works on Maxwell’s mature exposition of his theory; however, the aim of this entry contribution is rather more limited. Indeed, it is restricted to examining the contributions of Maxwell’s first paper towards developing the idea of electric current as the motion of an incompressible fluid. Thus, this entry highlights the strong connections of Maxwell’s epistemological view with the ‘mechanistic’ approach of the time to every aspect of physical phenomenology. For this purpose, this entry mentions some historical context surrounding the emergence of Maxwell’s innovative concepts.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"53 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138946214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.3390/encyclopedia4010001
Fátima Alves, Diogo Guedes Vidal
The social construction of nature aims to emphasise that the concept of nature has multiple meanings that vary in different socio-cultural contexts. This underlines the multiple ways in which both structures and individuals understand, explain, and engage with nature and the environment. Consequently, nature and cultures/societies are not separate entities, but are intertwined in complex and interdependent relationships. Therefore, nature is the result of human perceptions and social practices. The way we interact with, perceive, interpret, and value nature is influenced by a given society’s history and sociocultural factors. This intimate relationship is closely linked to power–knowledge and influence relations. Those with more power can impose a particular vision of, and relationship with, nature, resulting in inequalities and potentially harmful relations that can explain the environmental degradation that the contemporary world faces globally, despite its expression in particular contexts, thus configuring plural natures.
{"title":"Plural Nature(s): An Overview of Their Sociocultural Construction","authors":"Fátima Alves, Diogo Guedes Vidal","doi":"10.3390/encyclopedia4010001","DOIUrl":"https://doi.org/10.3390/encyclopedia4010001","url":null,"abstract":"The social construction of nature aims to emphasise that the concept of nature has multiple meanings that vary in different socio-cultural contexts. This underlines the multiple ways in which both structures and individuals understand, explain, and engage with nature and the environment. Consequently, nature and cultures/societies are not separate entities, but are intertwined in complex and interdependent relationships. Therefore, nature is the result of human perceptions and social practices. The way we interact with, perceive, interpret, and value nature is influenced by a given society’s history and sociocultural factors. This intimate relationship is closely linked to power–knowledge and influence relations. Those with more power can impose a particular vision of, and relationship with, nature, resulting in inequalities and potentially harmful relations that can explain the environmental degradation that the contemporary world faces globally, despite its expression in particular contexts, thus configuring plural natures.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"275 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139170706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.3390/encyclopedia3040110
Marta Wolska, Tadeusz Gorewoda, Marek Roszak, Lesław Gajda
Total Productive Maintenance (TPM) is an infrastructure-managing methodology that leads to improvements in production efficiency, quality, and safety. It includes a set of processes, techniques, and strategies based on forecasting, maintenance, the optimized cooperation of different company departments, and the minimization of costs related to downtime or accidents caused by equipment failure. This article discusses the history, assumptions of the TPM concept, and approach to implementing Total Productive Maintenance in organizations in detail. The right ingredients required for successful TPM implementation and barriers to implementation are also reviewed. The benefits of implementing TPM in organizations are presented and supported with examples of implementations in production and non-production organizations. The article is addressed to representatives of the manufacturing industry. TPM also indicates a high potential for implementation in non-production areas, which may be interesting, for example, for the service, medical, or laboratory industries.
{"title":"Implementation and Improvement of the Total Productive Maintenance Concept in an Organization","authors":"Marta Wolska, Tadeusz Gorewoda, Marek Roszak, Lesław Gajda","doi":"10.3390/encyclopedia3040110","DOIUrl":"https://doi.org/10.3390/encyclopedia3040110","url":null,"abstract":"Total Productive Maintenance (TPM) is an infrastructure-managing methodology that leads to improvements in production efficiency, quality, and safety. It includes a set of processes, techniques, and strategies based on forecasting, maintenance, the optimized cooperation of different company departments, and the minimization of costs related to downtime or accidents caused by equipment failure. This article discusses the history, assumptions of the TPM concept, and approach to implementing Total Productive Maintenance in organizations in detail. The right ingredients required for successful TPM implementation and barriers to implementation are also reviewed. The benefits of implementing TPM in organizations are presented and supported with examples of implementations in production and non-production organizations. The article is addressed to representatives of the manufacturing industry. TPM also indicates a high potential for implementation in non-production areas, which may be interesting, for example, for the service, medical, or laboratory industries.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"63 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.3390/encyclopedia3040108
Eleftheria Iakovaki, M. Konstantakis, Alexandros Teneketzis, George C. Konstantakis
This review constitutes a comprehensive systematic review analyzing cultural routes, with a particular focus on the concept of the cultural route as a tourist–cultural product. Within this framework, the paper offers an overview of contemporary technological challenges, concerns, and limitations. It thoroughly explores cutting-edge technologies pertaining to the promotion of cultural heritage, both in general and in the specific context of realizing the concept of the cultural route, a tourist–cultural service enriched by the utilization of new media. Additionally, it extensively references the latest techniques and models for enhancing the user experience of digital cultural tourism products. Moreover, the paper showcases existing digital platforms and tools that encapsulate and emphasize the notion of cultural tourism. It assesses the respective methodologies, technologies, and techniques employed in each case, accompanied by illustrative instances of their applications. Finally, an empirical evaluation was conducted focusing on user needs and expectations during a cultural route.
{"title":"Analyzing Cultural Routes and Their Role in Advancing Cultural Heritage Management within Tourism: A Systematic Review with a Focus on the Integration of Digital Technologies","authors":"Eleftheria Iakovaki, M. Konstantakis, Alexandros Teneketzis, George C. Konstantakis","doi":"10.3390/encyclopedia3040108","DOIUrl":"https://doi.org/10.3390/encyclopedia3040108","url":null,"abstract":"This review constitutes a comprehensive systematic review analyzing cultural routes, with a particular focus on the concept of the cultural route as a tourist–cultural product. Within this framework, the paper offers an overview of contemporary technological challenges, concerns, and limitations. It thoroughly explores cutting-edge technologies pertaining to the promotion of cultural heritage, both in general and in the specific context of realizing the concept of the cultural route, a tourist–cultural service enriched by the utilization of new media. Additionally, it extensively references the latest techniques and models for enhancing the user experience of digital cultural tourism products. Moreover, the paper showcases existing digital platforms and tools that encapsulate and emphasize the notion of cultural tourism. It assesses the respective methodologies, technologies, and techniques employed in each case, accompanied by illustrative instances of their applications. Finally, an empirical evaluation was conducted focusing on user needs and expectations during a cultural route.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"13 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139001055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.3390/encyclopedia3040109
Chloe Casey, Julia Taylor, Fiona Knight, Steven Trenoweth
Doctoral degrees include Doctor of Philosophy (PhD) and other professional doctorates such as Engineering Doctorate (EngD), Doctor of Education (EdD) or Doctor of Clinical Psychology (DClinPsy). Unlike undergraduate or postgraduate taught students, doctoral students focus upon a single, autonomous piece of research. Research indicates a high occurrence of mental health problems, mental distress, and symptoms of anxiety or depression in doctoral students. Additionally, there is concern that they may be less likely to disclose existing mental health problems or access support services than undergraduate or postgraduate taught students. This entry explores the known factors that contribute to the mental health of doctoral students studying in the United Kingdom.
{"title":"Understanding the Mental Health of Doctoral Students","authors":"Chloe Casey, Julia Taylor, Fiona Knight, Steven Trenoweth","doi":"10.3390/encyclopedia3040109","DOIUrl":"https://doi.org/10.3390/encyclopedia3040109","url":null,"abstract":"Doctoral degrees include Doctor of Philosophy (PhD) and other professional doctorates such as Engineering Doctorate (EngD), Doctor of Education (EdD) or Doctor of Clinical Psychology (DClinPsy). Unlike undergraduate or postgraduate taught students, doctoral students focus upon a single, autonomous piece of research. Research indicates a high occurrence of mental health problems, mental distress, and symptoms of anxiety or depression in doctoral students. Additionally, there is concern that they may be less likely to disclose existing mental health problems or access support services than undergraduate or postgraduate taught students. This entry explores the known factors that contribute to the mental health of doctoral students studying in the United Kingdom.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"70 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138997684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-30DOI: 10.3390/encyclopedia3040107
Roberta Lattanzi, R. Miele
G protein-coupled receptors (GPCRs) are transmembrane proteins that mediate the intracellular pathway of signals not only through heterotrimeric GTP-binding proteins (G proteins) but also through their associations with a variety of additional partner proteins. Prokineticin receptors 1 (PKR1) and 2 (PKR2) are new members of the GPCRs whose ligands are the novel chemokines prokineticin 1 (PK1) and prokineticin 2 (PK2). The multiplicity of G proteins coupled to PKRs, the ability of PKR2 to heterodimerize, the interaction of PKR2 with accessory proteins, and the existence of alternative splice isoforms of PKR2/PK2 explain the complexity of the system in the signal transduction pathway and, consequently, in the modulation of various physiological and pathological functions. Knowledge of these mechanisms provides the basis for the development of targeted drugs with therapeutic efficacy in PK-dependent diseases.
G 蛋白偶联受体（GPCRs）是一种跨膜蛋白，它不仅通过异三聚 GTP 结合蛋白（G 蛋白），还通过与其他各种伙伴蛋白的结合来介导细胞内的信号通路。促红细胞生成素受体 1（PKR1）和 2（PKR2）是 GPCR 的新成员，其配体是新型趋化因子促红细胞生成素 1（PK1）和促红细胞生成素 2（PK2）。与 PKR 相耦合的 G 蛋白的多样性、PKR2 异源二聚体的能力、PKR2 与附属蛋白的相互作用以及 PKR2/PK2 可供选择的剪接异构体的存在，都说明了该系统在信号转导途径中的复杂性，以及因此在调节各种生理和病理功能中的复杂性。对这些机制的了解为开发对 PK 依赖性疾病有疗效的靶向药物奠定了基础。
{"title":"Interaction of Prokineticin Receptors with Accessory Proteins","authors":"Roberta Lattanzi, R. Miele","doi":"10.3390/encyclopedia3040107","DOIUrl":"https://doi.org/10.3390/encyclopedia3040107","url":null,"abstract":"G protein-coupled receptors (GPCRs) are transmembrane proteins that mediate the intracellular pathway of signals not only through heterotrimeric GTP-binding proteins (G proteins) but also through their associations with a variety of additional partner proteins. Prokineticin receptors 1 (PKR1) and 2 (PKR2) are new members of the GPCRs whose ligands are the novel chemokines prokineticin 1 (PK1) and prokineticin 2 (PK2). The multiplicity of G proteins coupled to PKRs, the ability of PKR2 to heterodimerize, the interaction of PKR2 with accessory proteins, and the existence of alternative splice isoforms of PKR2/PK2 explain the complexity of the system in the signal transduction pathway and, consequently, in the modulation of various physiological and pathological functions. Knowledge of these mechanisms provides the basis for the development of targeted drugs with therapeutic efficacy in PK-dependent diseases.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139198993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-29DOI: 10.3390/encyclopedia3040106
Kristián Kalamen, František Pollák, P. Markovič
The market serves as the convergence point of supply and demand and represents the process through which market relations between economic units materialize. From a global perspective, the focus shifts to the world market, which is the fundamental structure on which the global economy is based. The world economy operates as a very complex ecosystem. When it is exposed to the extremely damaging effects of a global pandemic, the term of a pandemic economic crisis becomes relevant.
{"title":"Pandemic Economic Crises","authors":"Kristián Kalamen, František Pollák, P. Markovič","doi":"10.3390/encyclopedia3040106","DOIUrl":"https://doi.org/10.3390/encyclopedia3040106","url":null,"abstract":"The market serves as the convergence point of supply and demand and represents the process through which market relations between economic units materialize. From a global perspective, the focus shifts to the world market, which is the fundamental structure on which the global economy is based. The world economy operates as a very complex ecosystem. When it is exposed to the extremely damaging effects of a global pandemic, the term of a pandemic economic crisis becomes relevant.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-28DOI: 10.3390/encyclopedia3040105
Clive Palmer, A. Sprake, Chris Hughes
The management of expectations in doctoral education relates to the negotiation and agreement of a learning contract denoting actions and initiatives between a student and a supervisor. A learning contract is a set of understandings of what things, actions and initiatives might reasonably be expected from whom, in the course of learning, where there is a natural power imbalance. This is important so that both scholarly and material progress can be made along all points of the doctoral learning experience, i.e., that learning is personalised, professional and productive towards an original contribution of knowledge. It is the evidencing of this continual learning process through research that is deemed to be doctoral at the final examination stage. A doctoral student is a learner on the highest degree pathway that is available at all UK universities. This typically results in a thesis, marking the end point of being supervised whereupon an assessment or examination takes place, which, in UK universities, is called a viva voce (Latin: the living voice). This is a verbal account or defence of the thesis document by the student, made to two or three examiners who comprise the examination team. In the UK, the viva examination is a private event, while elsewhere, for example, across Europe and North America, the examination can be a public event. A student on a doctoral programme usually has a period of registration that is 3 years full-time or 6 years part-time. Other terms that can be used interchangeably around doctoral supervision are candidate (for the student) and candidature, which is their period of registration. Supervisors also have roles denoted as the Director of Studies (DoS) or Principal Investigator (PI). The supervision team is led by a Director of Studies (or PI) who is often the most experienced scholar who teaches, guides and mentors their student’s learning through the research they conduct. There are usually at least two supervisors in a supervision team in the UK, but there can be more as required depending upon the specialisms and topics being researched. Expectations formed by either the student or the supervisor(s) can be about physical resources to embark upon a passage of learning through a doctoral programme, or more typically, the discussion of expectations relates to managing the behaviours of students and supervisors in their respective roles. Managed expectations help to achieve a balance between the intellectual sharing of expertise by the supervisor with the self-directed initiatives for learning, which are taken by the student. The aim of managing expectations is to help a student move from dependence in their learning at the start of their programme to becoming an independent doctoral-level scholar who, once graduated as doctor, can act autonomously to conduct their own research, or even embark upon supervising others’ research in the future.
{"title":"Managing the Expectations of Doctoral Students and Their Supervisors: A UK Perspective","authors":"Clive Palmer, A. Sprake, Chris Hughes","doi":"10.3390/encyclopedia3040105","DOIUrl":"https://doi.org/10.3390/encyclopedia3040105","url":null,"abstract":"The management of expectations in doctoral education relates to the negotiation and agreement of a learning contract denoting actions and initiatives between a student and a supervisor. A learning contract is a set of understandings of what things, actions and initiatives might reasonably be expected from whom, in the course of learning, where there is a natural power imbalance. This is important so that both scholarly and material progress can be made along all points of the doctoral learning experience, i.e., that learning is personalised, professional and productive towards an original contribution of knowledge. It is the evidencing of this continual learning process through research that is deemed to be doctoral at the final examination stage. A doctoral student is a learner on the highest degree pathway that is available at all UK universities. This typically results in a thesis, marking the end point of being supervised whereupon an assessment or examination takes place, which, in UK universities, is called a viva voce (Latin: the living voice). This is a verbal account or defence of the thesis document by the student, made to two or three examiners who comprise the examination team. In the UK, the viva examination is a private event, while elsewhere, for example, across Europe and North America, the examination can be a public event. A student on a doctoral programme usually has a period of registration that is 3 years full-time or 6 years part-time. Other terms that can be used interchangeably around doctoral supervision are candidate (for the student) and candidature, which is their period of registration. Supervisors also have roles denoted as the Director of Studies (DoS) or Principal Investigator (PI). The supervision team is led by a Director of Studies (or PI) who is often the most experienced scholar who teaches, guides and mentors their student’s learning through the research they conduct. There are usually at least two supervisors in a supervision team in the UK, but there can be more as required depending upon the specialisms and topics being researched. Expectations formed by either the student or the supervisor(s) can be about physical resources to embark upon a passage of learning through a doctoral programme, or more typically, the discussion of expectations relates to managing the behaviours of students and supervisors in their respective roles. Managed expectations help to achieve a balance between the intellectual sharing of expertise by the supervisor with the self-directed initiatives for learning, which are taken by the student. The aim of managing expectations is to help a student move from dependence in their learning at the start of their programme to becoming an independent doctoral-level scholar who, once graduated as doctor, can act autonomously to conduct their own research, or even embark upon supervising others’ research in the future.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139221044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-23DOI: 10.3390/encyclopedia3040104
T. Ruh, F. Schrenk, T. Berger, Christoph Rameshan
Perovskite-type oxides (ABO3) are a highly versatile class of materials. They are compositionally flexible, as their constituents can be chosen from a wide range of elements across the periodic table with a vast number of possible combinations. This flexibility enables the tuning of the materials’ properties by doping the A- and/or B-sites of the base structure, facilitating the application-oriented design of materials. The ability to undergo exsolution under reductive conditions makes perovskite-type oxides particularly well-suited for catalytic applications. Exsolution is a process during which B-site elements migrate to the surface of the material where they form anchored and finely dispersed nanoparticles that are crucially important for obtaining a good catalytic performance, while the perovskite base provides a stable support. Recently, exsolution catalysts have been investigated as possible materials for CO2 utilization reactions like reverse water–gas shift reactions or methane dry reforming.
透镜型氧化物（ABO3）是一类用途非常广泛的材料。它们在组成上非常灵活，因为其成分可以从元素周期表中的各种元素中选择，并有大量可能的组合。这种灵活性使人们能够通过掺杂基底结构的 A 位和/或 B 位来调整材料的特性，从而促进了以应用为导向的材料设计。在还原条件下发生外溶解的能力使包晶型氧化物特别适合催化应用。外溶解是一个过程，在此过程中，B-位元素迁移到材料表面，在那里形成锚定和精细分散的纳米颗粒，这对获得良好的催化性能至关重要，而透辉石基则提供了稳定的支撑。最近，外溶解催化剂作为二氧化碳利用反应（如逆向水-气变换反应或甲烷干重整）的可能材料进行了研究。
{"title":"Perovskite-Type Oxides as Exsolution Catalysts in CO2 Utilization","authors":"T. Ruh, F. Schrenk, T. Berger, Christoph Rameshan","doi":"10.3390/encyclopedia3040104","DOIUrl":"https://doi.org/10.3390/encyclopedia3040104","url":null,"abstract":"Perovskite-type oxides (ABO3) are a highly versatile class of materials. They are compositionally flexible, as their constituents can be chosen from a wide range of elements across the periodic table with a vast number of possible combinations. This flexibility enables the tuning of the materials’ properties by doping the A- and/or B-sites of the base structure, facilitating the application-oriented design of materials. The ability to undergo exsolution under reductive conditions makes perovskite-type oxides particularly well-suited for catalytic applications. Exsolution is a process during which B-site elements migrate to the surface of the material where they form anchored and finely dispersed nanoparticles that are crucially important for obtaining a good catalytic performance, while the perovskite base provides a stable support. Recently, exsolution catalysts have been investigated as possible materials for CO2 utilization reactions like reverse water–gas shift reactions or methane dry reforming.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"93 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139245815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.3390/encyclopedia3040103
Chiara Elmi
Phyllosilicates are common minerals that include the most widely known micas and clay minerals. These minerals are found in several natural environments and have unique physical-chemical features, such as cation exchange capacity (CEC) and surface charge properties. When phyllosilicates are nano-sized, their physical-chemical properties are enhanced from those of the micro-sized counterpart. Because of their unique crystal chemical and physical-chemical features, kinetics, and particle size, nano-sized clay minerals (i.e., kaolinite, montmorillonite/illite) and micas (i.e., muscovite) are of great interest in several fields spanning from environmental applications to engineered materials. This paper aims to overview the recent developments of environmental protection and technological applications employing nano-sized natural micas and clay minerals. Emphasis is given to the role that the unique physical-chemical properties of montmorillonite, vermiculite, kaolinite, and muscovite play in nanoparticle formulations, manufacture, and technical performance.
{"title":"Physical-Chemical Properties of Nano-Sized Phyllosilicates: Recent Environmental and Industrial Advancements","authors":"Chiara Elmi","doi":"10.3390/encyclopedia3040103","DOIUrl":"https://doi.org/10.3390/encyclopedia3040103","url":null,"abstract":"Phyllosilicates are common minerals that include the most widely known micas and clay minerals. These minerals are found in several natural environments and have unique physical-chemical features, such as cation exchange capacity (CEC) and surface charge properties. When phyllosilicates are nano-sized, their physical-chemical properties are enhanced from those of the micro-sized counterpart. Because of their unique crystal chemical and physical-chemical features, kinetics, and particle size, nano-sized clay minerals (i.e., kaolinite, montmorillonite/illite) and micas (i.e., muscovite) are of great interest in several fields spanning from environmental applications to engineered materials. This paper aims to overview the recent developments of environmental protection and technological applications employing nano-sized natural micas and clay minerals. Emphasis is given to the role that the unique physical-chemical properties of montmorillonite, vermiculite, kaolinite, and muscovite play in nanoparticle formulations, manufacture, and technical performance.","PeriodicalId":72905,"journal":{"name":"Encyclopedia","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139263534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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