scholarly journals The Flame Retardancy of Polyethylene Composites: From Fundamental Concepts to Nanocomposites

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5157
Author(s):  
Erfan Rezvani Ghomi ◽  
Fatemeh Khosravi ◽  
Zahra Mossayebi ◽  
Ali Saedi Ardahaei ◽  
Fatemeh Morshedi Dehaghi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flame Retardancy ◽  
Cost Efficiency ◽  
Research Papers ◽  
The Past ◽  
Wide Range ◽  
Fire Retardance ◽  
Low Toxicity ◽  
Implementing Strategies

Polyethylene (PE) is one the most used plastics worldwide for a wide range of applications due to its good mechanical and chemical resistance, low density, cost efficiency, ease of processability, non-reactivity, low toxicity, good electric insulation, and good functionality. However, its high flammability and rapid flame spread pose dangers for certain applications. Therefore, different flame-retardant (FR) additives are incorporated into PE to increase its flame retardancy. In this review article, research papers from the past 10 years on the flame retardancy of PE systems are comprehensively reviewed and classified based on the additive sources. The FR additives are classified in well-known FR families, including phosphorous, melamine, nitrogen, inorganic hydroxides, boron, and silicon. The mechanism of fire retardance in each family is pinpointed. In addition to the efficiency of each FR in increasing the flame retardancy, its impact on the mechanical properties of the PE system is also discussed. Most of the FRs can decrease the heat release rate (HRR) of the PE products and simultaneously maintains the mechanical properties in appropriate ratios. Based on the literature, inorganic hydroxide seems to be used more in PE systems compared to other families. Finally, the role of nanotechnology for more efficient FR-PE systems is discussed and recommendations are given on implementing strategies that could help incorporate flame retardancy in the circular economy model.

scholarly journals Exploring the Role of Nanoparticles in Enhancing Mechanical Properties of Hydrogel Nanocomposites

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 882 ◽  
Author(s):  
Josergio Zaragoza ◽  
Scott Fukuoka ◽  
Marcus Kraus ◽  
James Thomin ◽  
Prashanth Asuri
Keyword(s):  
Mechanical Properties ◽  
Elastic Moduli ◽  
Maximum Modulus ◽  
Polymer Particle ◽  
Particle Interactions ◽  
Polyacrylamide Hydrogels ◽  
The Past ◽  
Wide Range ◽  
Hydrogel Nanocomposites

Over the past few decades, research studies have established that the mechanical properties of hydrogels can be largely impacted by the addition of nanoparticles. However, the exact mechanisms behind such enhancements are not yet fully understood. To further explore the role of nanoparticles on the enhanced mechanical properties of hydrogel nanocomposites, we used chemically crosslinked polyacrylamide hydrogels incorporating silica nanoparticles as the model system. Rheological measurements indicate that nanoparticle-mediated increases in hydrogel elastic modulus can exceed the maximum modulus that can be obtained through purely chemical crosslinking. Moreover, the data reveal that nanoparticle, monomer, and chemical crosslinker concentrations can all play an important role on the nanoparticle mediated-enhancements in mechanical properties. These results also demonstrate a strong role for pseudo crosslinking facilitated by polymer–particle interactions on the observed enhancements in elastic moduli. Taken together, our work delves into the role of nanoparticles on enhancing hydrogel properties, which is vital to the development of hydrogel nanocomposites with a wide range of specific mechanical properties.

History and Morality

2020 ◽  
Author(s):  
Donald Bloxham
Keyword(s):  
Foreign Country ◽  
Moral Thought ◽  
Majority Opinion ◽  
The Past ◽  
Wide Range ◽  
Moral Judgements ◽  
Value Judgements ◽  
The Impact

Against majority opinion within his profession, Donald Bloxham argues that it is legitimate, often unavoidable, and frequently important for historians to make value judgements about the past. History and Morality draws on a wide range of historical examples, and its author’s insights as a practising historian. Examining concepts like impartiality, neutrality, contextualization, and the use and abuse of the idea of the past as a foreign country, Bloxham’s book investigates how the discipline has got to the point where what is preached can be so inconsistent with what is practised. It illuminates how far tacit moral judgements infuse works of history, and how strange those histories would look if the judgements were removed. Bloxham argues that rather than trying to eradicate all judgemental elements from their work historians need to think more consistently about how, and with what justification, they make the judgements that they do. The importance of all this lies not just in the responsibilities that historians bear towards the past—responsibilities to take historical actors on those actors’ own terms and to portray the impact of those actors’ deeds—but also in the role of history as a source of identity, pride, and shame in the present. The account of moral thought in History and Morality has ramifications far beyond the activities of vocational historians.

scholarly journals A bio-based phosphaphenanthrene-containing derivative modified epoxy thermosets with good flame retardancy, high mechanical properties and transparency

RSC Advances ◽  
2021 ◽  
Vol 11 (49) ◽  
pp. 30943-30954
Author(s):  
Wei Peng ◽  
Yu-xuan Xu ◽  
Shi-bin Nie ◽  
Wei Yang
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Epoxy Resins ◽  
Flame Retardants ◽  
The Past ◽  
Phosphorus Containing ◽  
Modified Epoxy

Phosphorus-containing flame retardants have received huge interest for improving the flame retardant behavior of epoxy resins (EP) over the past few decades.

Restaurant and foodservice research

2017 ◽  
Vol 29 (4) ◽  
pp. 1203-1234 ◽  
Author(s):  
Robin DiPietro
Keyword(s):  
Past Research ◽  
Future Research ◽  
Research Papers ◽  
Content Type ◽  
The Past ◽  
Restaurant Management ◽  
Foodservice Industry ◽  
Future Direction

Purpose The purpose of this paper is to present a review of the foodservice and restaurant literature that has been published over the past 10 years in the top hospitality and tourism journals. This information will be used to identify the key trends and topics studied over the past decade, and help to identify the gaps that appear in the research to identify opportunities for advancing future research in the area of foodservice and restaurant management. Design/methodology/approach This paper takes the form of a critical review of the extant literature that has been done in the foodservice and restaurant industries. Literature from the past 10 years will be qualitatively assessed to determine trends and gaps in the research to help guide the direction for future research. Findings The findings show that the past 10 years have seen an increase in the number of and the quality of foodservice and restaurant management research articles. The topics have been diverse and the findings have explored the changing and evolving segments of the foodservice industry, restaurant operations, service quality in foodservice, restaurant finance, foodservice marketing, food safety and healthfulness and the increased role of technology in the industry. Research limitations/implications Given the number of research papers done over the past 10 years in the area of foodservice, it is possible that some research has been missed and that some specific topics within the breadth and depth of the foodservice industry could have lacked sufficient coverage in this one paper. The implications from this paper are that it can be used to inform academics and practitioners where there is room for more research, it could provide ideas for more in-depth discussion of a specific topic and it is a detailed start into assessing the research done of late. Originality/value This paper helps foodservice researchers in determining where past research has gone and gives future direction for meaningful research to be done in the foodservice area moving forward to inform academicians and practitioners in the industry.

scholarly journals From Nursery to Nursing Home: Emerging Concepts in Clostridioides difficile Pathogenesis

2020 ◽  
Vol 88 (7) ◽  
Author(s):  
Alexander B. Smith ◽  
Joshua Soto Ocana ◽  
Joseph P. Zackular
Keyword(s):  
Pharmaceutical Drugs ◽  
Human Gastrointestinal Tract ◽  
Content Type ◽  
The Past ◽  
Clostridioides Difficile ◽  
Wide Range ◽  
Pediatric Populations ◽  
The Impact ◽  
Shed Light

ABSTRACT Clostridioides difficile is a Gram-positive, spore-forming, anaerobic bacterium that infects the human gastrointestinal tract, causing a wide range of disorders that vary in severity from mild diarrhea to toxic megacolon and/or death. Over the past decade, incidence, severity, and costs associated with C. difficile infection (CDI) have increased dramatically in both the pediatric and adult populations. The factors driving this rapidly evolving epidemiology remain largely unknown but are likely due in part to previously unappreciated host, microbiota, and environmental factors. In this review, we will cover the risks and challenges of CDI in adult and pediatric populations and examine asymptomatic colonization in infants. We will also discuss the emerging role of diet, pharmaceutical drugs, and pathogen-microbiota interactions in C. difficile pathogenesis, as well as the impact of host-microbiota interactions in the manifestation of C. difficile-associated disease. Finally, we highlight new areas of research and novel strategies that may shed light on this complex infection and provide insights into the future of microbiota-based therapeutics for CDI.

scholarly journals A sertéshústermelést és -fogyasztást befolyásoló tényezők

2019 ◽  
Vol 13 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Zsolt Kőműves ◽  
Viktória Horváthné Petrás
Keyword(s):  
Food Processing ◽  
Cost Efficiency ◽  
Trade Unions ◽  
Arable Land ◽  
Market Price ◽  
Economic Market ◽  
The Past ◽  
The Social ◽  
Underlying Causes

The decrease in the number of pigs grew to a drastic proportion during the past few decades. before the change of the regime therewere approximately 10 million pigs counted, but today this number is slightly beyond 3 million. The decline in livestock has anegative effect on the competitive position of both this sector and that of other branches of industry as well weakening significantlythe economic importance of the sector. The underlying causes of the process leading to the decline are diverse. to reveal thesolution a versatile analysis of the economic situation is essential, which should be started in the first place by the examination ofthe factors defining the competitiveness of the pig sector. The aim of this work is to reveal and characterize the national capacities,the physical and biological, as well as the social, economic (market) and human factors pointing to the most important differencesat the same time. This study analyzes the efficiency of the chosen farms according to the size of plant, standard of production, technologyand capacity of maintenance. summarizing the farmers’ opinions and the data obtained, it can be stated that farmers in thecurrent situation are satisfied with the buying price as one of the most essential factors of production. however, they emphasizedthe role of prices as a factor of uncertainty. As a result of changing the out-of-date technology considerable improvement could beobserved in the natural indexes. Unfortunately, significant changes should be accomplished in the feasibility of support andfinancing investment. The strict environmental regulations of animal keeping make the operation of farms – mainly of those thatdo not possess arable land – more difficult. reforms would provide relief for the operating farms. The market price regulation ofthe alternative fodder and the existent substitute products could appear as a significant cost efficiency factor during production.Workers with unsuitable education – and often being incompetent –, trade unions operating as false organizations as well as thelack of cooperation with the food processing industry affect the sector sensitively.

scholarly journals International trade in services: The role of international shipping

2007 ◽  
Vol 59 (2-3) ◽  
pp. 376-399
Author(s):  
Ivana Popovic-Petrovic
Keyword(s):  
International Trade ◽  
Trade In Services ◽  
National Interests ◽  
Transportation Services ◽  
The Past ◽  
Wide Range ◽  
The World ◽  
Increasing Demand ◽  
Merchandise Trade

The General Agreement on Trade in Services (GATS) is one of the World Trade Organization's most important agreements. This accord is the first and only set of multilateral rules covering international trade in services. It is a framework for international trade in services and a legal basis for resolving conflicting national interests. For the past two decades, trade in services has grown faster than merchandise trade. Currently, they represent more than two thirds of the World Gross Domestic Product. As the term services covers a wide range of intangible and heterogeneous products and activities, there has been an increasing demand for detailed, relevant and internationally comparable statistical information on trade in services. In the last ten years, the share of transportation services in international trade in commercial services was steady and amounted to about one quarter.

scholarly journals Quality assurance in Irish schools: Inspection and school self-evaluation

2020 ◽  
Vol 68 (4) ◽  
pp. 161-180
Author(s):  
Gerry McNamara ◽  
Joe O’Hara ◽  
Martin Brown ◽  
Irene Quinn
Keyword(s):  
Quality Assurance ◽  
Public Sector ◽  
School Evaluation ◽  
School Inspection ◽  
The Public ◽  
Policy Actors ◽  
Self Evaluation ◽  
The Past ◽  
Wide Range

AbstractIn this paper, we provide an overview of the development of school inspection in Ireland over the past twenty years using the analytic and critical lens developed by Richard Boyle in partnership with the current authors. The paper is fundamentally a reflection on the nature, purpose and operation of evaluation in the Irish public sector through the lens of education. The paper provides a historical overview of developments in the linked areas of school evaluation and inspection, and goes on to explore how the implementation of this mode of quality assurance has influenced, and been influenced by, a wide range of policy actors. The argument made is that education has embedded a culture of evaluation in a unique yet systemically resonant manner and that a reflection on this reality will help illuminate our understanding of the role of evaluation across the public sector as a whole.

scholarly journals Halal entrepreneurship from Maqasid-al-Sharia’h perspective: inseparable concept for Halalpreneurs

Food Research ◽  
2020 ◽  
Vol 4 (S1) ◽  
pp. 34-42 ◽  
Author(s):  
M.A. Abdullah ◽  
M.S.E. Azam
Keyword(s):  
Well Being ◽  
Point Of View ◽  
Research Papers ◽  
Proper Understanding ◽  
The Past ◽  
Muslim Countries ◽  
Wide Range ◽  
The World ◽  
Definition Of ◽  
Conference Papers

Entrepreneurship has become one of the vital activities for economic development. It is synonymous with job creation, innovation, improvement in the societal well-being and economic growth in developed and developing countries alike. There is great interest in entrepreneurship globally as well as in Malaysia. Over the past few years, many individuals, as well as families, are actively engaged with the small business. Also, in light of the 2013 GEM study, 12.7% of Americans are effectively occupied with beginning a business or are the proprietor/director of a business that is under three years of age. Simultaneously, the Halal industry, that represents the global Islamic economy, is the fastest-growing market in the world with $2.3 trillion market value. Halal entrepreneurs (Halalpreneurs) are the major contributors to this achievement as they constitute a significant portion of the total establishment in most of the Muslim countries. That is the reason Entrepreneurship has turned into a conventional term that depicts a wide range of practices that include being innovative, devilish and tricky. Entrepreneurship has been defined by many scholars, researchers, industry players, and academicians globally which have also been perceived in the same way by most of the economies around the world. However, the Islamic economy looks at the concept of ‘entrepreneurship’ in a different way and perceives it as ‘Halalpreneurship’. To define entrepreneurship in the halal industry, although, the term ‘Halalpreneurship’ is being used, surprisingly the term has not been defined properly yet. It is essential for the Muslim entrepreneurs to have a proper understanding of Halalpreneurship from Maqasid-al-Shariah perspective. Such point of view is crucial to justify the term in the Halal industry and differentiate from conventional entrepreneurs. On this context, this paper provides concept and definition of Halalpreneurship justifying from the perspective of Maqasid-al-Sharia’h. It also identifies the differences between Halalpreneurs and entrepreneurs using secondary resources available in the forms of literature, research papers, journal papers, articles, conference papers, online publications, etc. The findings of the study will clarify the concept of Halalpreneurship from Maqasid-al-Sharia’h perspective and recognize Halalpreneurs distinguished from conventional entrepreneurs.

scholarly journals Endothelial dysfunction in context of women’s health disorders from menarche to menopause

2020 ◽  
Vol 4 (33) ◽  
pp. 6-14
Author(s):  
I. V. Kuznetsova
Keyword(s):  
Endothelial Dysfunction ◽  
Drug Group ◽  
Female Population ◽  
Physiological Conditions ◽  
The Past ◽  
Vascular Bed ◽  
Pathological Conditions ◽  
Wide Range ◽  
Timely Treatment

Endothelial function is an essential component of providing homeostasis, which allows controlling the state of the vascular bed and ensuring blood supply to organs both under physiological conditions and under the influence of various damaging factors. Endothelial dysfunction is associated with a wide range of pathological conditions and diseases, in the pathogenesis of which the vascular link is involved. Understanding the unifying role of endothelial dysfunction in the pathology of different fields of medicine allows, firstly, to predict the development of serious socially significant diseases, such as cardiovascular diseases, which remain the main cause of death among women. In particular, over the past decade, several cardiovascular risk factors specific to the female population have been identified, such as hypertensive pregnancy complications and menopausal vasomotor symptoms, which, in turn, are caused by endothelial dysfunction. Secondly, timely treatment of endotheliosis suspends or completely prevents both transient disorders associated with endothelial dysfunction and their serious consequences. In this regard, the drug group of glycosaminoglycans and its representative sulodexide are of interest.

Sign in / Sign up

Export Citation Format

Share Document