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Literature survey
About: Literature survey is a research topic. Over the lifetime, 15372 publications have been published within this topic receiving 459196 citations.
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TL;DR: It is concluded that most models can be applied for design problems at manufacturing centres and new analytical and simulation models need to be developed for large AGV systems to overcome large computation times, NP-completeness, congestion, deadlocks and delays in the system and finite planning horizons.
691 citations
TL;DR: An overview of the state of the art on impact and contact modelling methodologies, taking into account their different aspects, specifically, the energy loss, the influence of the friction model, solution approaches, the multi-contact problem and the experimental verification is provided.
690 citations
TL;DR: A variety of strategies such as structural tuning, composition control, doping, hybrid structures, heterostructures, defect control, temperature effects and porosity effects on metal sulfide nanocrystals are discussed and how they are exploited to enhance performance and develop future energy materials.
Abstract: In recent years, nanocrystals of metal sulfide materials have attracted scientific research interest for renewable energy applications due to the abundant choice of materials with easily tunable electronic, optical, physical and chemical properties. Metal sulfides are semiconducting compounds where sulfur is an anion associated with a metal cation; and the metal ions may be in mono-, bi- or multi-form. The diverse range of available metal sulfide materials offers a unique platform to construct a large number of potential materials that demonstrate exotic chemical, physical and electronic phenomena and novel functional properties and applications. To fully exploit the potential of these fascinating materials, scalable methods for the preparation of low-cost metal sulfides, heterostructures, and hybrids of high quality must be developed. This comprehensive review indicates approaches for the controlled fabrication of metal sulfides and subsequently delivers an overview of recent progress in tuning the chemical, physical, optical and nano- and micro-structural properties of metal sulfide nanocrystals using a range of material fabrication methods. For hydrogen energy production, three major approaches are discussed in detail: electrocatalytic hydrogen generation, powder photocatalytic hydrogen generation and photoelectrochemical water splitting. A variety of strategies such as structural tuning, composition control, doping, hybrid structures, heterostructures, defect control, temperature effects and porosity effects on metal sulfide nanocrystals are discussed and how they are exploited to enhance performance and develop future energy materials. From this literature survey, energy conversion currently relies on a limited range of metal sulfides and their composites, and several metal sulfides are immature in terms of their dissolution, photocorrosion and long-term durability in electrolytes during water splitting. Future research directions for innovative metal sulfides should be closely allied to energy and environmental issues, along with their advanced characterization, and developing new classes of metal sulfide materials with well-defined fabrication methods.
685 citations
TL;DR: This article aims to provide a comprehensive literature survey of plants that have been tested for AChE inhibitory activity and reports numerous phytoconstituents and promising plant species as A ChE inhibitors.
684 citations
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TL;DR: The authors provide a general overview of contributions to the literature on the informal sector, with a special focus on the PublicChoice approach, and compare these contributions across two institutionallydifferent types of countries: developed and less developed (developing and transition)countries.
Abstract: The main goal of this study is two-fold: (1) to provide a general overview of thecontributions to the literature on the informal sector, with a special focus on the PublicChoice approach; and (2) to compare these contributions across two institutionallydifferent types of countries: developed and less developed (developing and transition)countries. The paper focuses on the criteria used to define the informal sector, therelationship between the formal and informal economy, tax evasion, and PublicChoice analysis. It is stressed throughout this paper that the distinction between thetwo types of countries is of key importance.
673 citations