scholarly journals A review on chemical and mechanical phenomena at the wafer interface during chemical mechanical planarization

2021 ◽  
Author(s):  
Jihoon Seo
Keyword(s):  
Integrated Circuit ◽  
Chemical Mechanical Planarization ◽  
Future Research ◽  
Feature Size ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Complex Interactions ◽  
Future Research Directions ◽  
New Strategies ◽  
Mechanical Phenomena

AbstractAs the minimum feature size of integrated circuit elements has shrunk below 7 nm, chemical mechanical planarization (CMP) technology has grown by leaps and bounds over the past several decades. There has been a growing interest in understanding the fundamental science and technology of CMP, which has continued to lag behind advances in technology. This review paper provides a comprehensive overview of various chemical and mechanical phenomena such as contact mechanics, lubrication models, chemical reaction that occur between slurry components and films being polished, electrochemical reactions, adsorption behavior and mechanism, temperature effects, and the complex interactions occurring at the wafer interface during polishing. It also provides important insights into new strategies and novel concepts for next‐generation CMP slurries. Finally, the challenges and future research directions related to the chemical and mechanical process and slurry chemistry are highlighted.

scholarly journals Recurrent Cholera Outbreaks in Sub-Saharan Africa: Moving beyond Epidemiology to Understand the Environmental Reservoirs and Drivers

Challenges ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 1 ◽  
Author(s):  
Willis Gwenzi ◽  
Edmond Sanganyado
Keyword(s):  
Epidemiological Studies ◽  
Sub Saharan Africa ◽  
Environmental Drivers ◽  
Future Research ◽  
Research Directions ◽  
Complex Interactions ◽  
Future Research Directions ◽  
Sub Saharan ◽  
And Control ◽  
Water Borne

Recurrent cholera outbreaks in sub-Saharan Africa (SSA) attracted a lot of research interest, raising questions about the effectiveness of current prevention and control methods. However, research on cholera and other water-borne diseases in Africa is dominated by epidemiological studies, while investigations on the environmental drivers and reservoirs of cholera remain scarce. The current discourse relating cholera to the environment in SSA is often limited to the rudimentary statement that, “cholera is caused by the consumption of contaminated water and food”. Yet, beyond this simplistic view, literature elsewhere shows that cholera outbreaks are controlled by its complex interactions with environmental drivers and reservoirs. This brings to question whether cholera can be eradicated in SSA without understanding these complex interactions. The current review seeks to (1) highlight the nature and dynamics of recent cholera outbreaks in SSA, (2) discuss the importance of environmental reservoirs of Vibrio cholerae, and anthropogenic and hydroclimatic drivers in controlling the dynamics of cholera outbreaks, and (3) highlight key knowledge gaps and future research directions, and the need to harness emerging research tools such as modeling, machine learning, data mining, and genomics techniques to better understand the cholera dynamics. By bringing to fore these often-overlooked issues in cholera research, we seek to stimulate discussion, and promote a shift toward cross-disciplinary research on cholera and other water-borne diseases in SSA and beyond.

Delicate and Noxious Scrub

1998 ◽  
Author(s):  
JC Noble
Keyword(s):  
New South ◽  
Future Research ◽  
Ecological Processes ◽  
Research Directions ◽  
The Past ◽  
South Wales ◽  
Future Research Directions ◽  
The 1960S ◽  
New Strategies

Semi-arid woodlands are an important part of the Australian landscape and they have been the focus for scientific research by CSIRO since the 1960s. This book reviews that research and sets it in a historical perspective. It examines the development of pastoral science, with particular reference to the farming frontier in western New South Wales, as well as research conducted by CSIRO over the past thirty years aimed at helping manage increasing shrub densities while improving productivity. The author discusses past, current and future research directions and looks at how management perceptions and approaches continue to change as understanding of ecological processes and new strategies evolve.

Indigenous alder based farming practices in Nagaland, India: A sustainable agricultural model

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Mechuselie Kehie
Keyword(s):  
Agricultural Land ◽  
Agroforestry System ◽  
Deciduous Tree ◽  
Future Research ◽  
Agricultural Crops ◽  
Farming Practices ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Ecological Farming ◽  
Future Research Directions

Traditional alder (Alnus nepalensis) based agroforestry system is an age-old ecological farming practice of some indigenous tribes viz., Angami, Chakhesang, Chang, Yimchunger and Konyak of Nagaland state in India. Alder is a deciduous or semi-deciduous tree naturally grown throughout the Himalayas. In this system of farming, crops are grown as intercrop with alder trees. Agricultural crops co-cultivated with alder, forms a very remunerative agroforestry system. Alder does not require high soil fertility and hence, conversion of wasteland into agricultural land through this system is very much practicable. This system is an outstanding sustainable model of land use evolved through numerous years of testing among the indigenous tribes of Nagaland. The present review presents a comprehensive overview of indigenous alder based farming practices in Nagaland. Furthermore, the paper also describes the opportunities, challenges and future research directions towards developing and utilizing this model for sustainable agriculture.

scholarly journals Interfaced heterogeneous nanodimers

2015 ◽  
Vol 2 (3) ◽  
pp. 329-348 ◽  
Author(s):  
Yugang Sun
Keyword(s):  
Strong Coupling ◽  
Synthesis And Characterization ◽  
Future Research ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Nanoscience And Nanotechnology ◽  
Materials Research ◽  
Future Research Directions

Abstract Dimerization of different nanocomponents in single nanoparticles becomes interesting due to not only inheritance of properties of both components but also generation of new properties associated with strong coupling of the two components. As a class of emerging nanomaterials, interfaced heterogeneous nanodimers (IHNDs) are attracting more attentions in the field of materials research, in particular, nanoscience and nanotechnology. This review provides a timely and comprehensive overview on the general principles for the synthesis of IHNDs and typical examples of IHNDs made of various compositional combinations. The current challenges related to the synthesis and characterization of IHNDs are summarized at the end of the review and future research directions are also discussed.

scholarly journals Hashtag Recommendation Methods for Twitter and Sina Weibo: A Review

2021 ◽  
Vol 13 (5) ◽  
pp. 129
Author(s):  
Areej Alsini ◽  
Du Q. Huynh ◽  
Amitava Datta
Keyword(s):  
Systematic Review ◽  
Digital Libraries ◽  
Future Research ◽  
Research Papers ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Sina Weibo ◽  
Social Media Platforms ◽  
Future Research Directions ◽  
Textual Content

Hashtag recommendation suggests hashtags to users while they write microblogs in social media platforms. Although researchers have investigated various methods and factors that affect the performance of hashtag recommendations in Twitter and Sina Weibo, a systematic review of these methods is lacking. The objectives of this study are to present a comprehensive overview of research on hashtag recommendation for tweets and present insights from previous research papers. In this paper, we search for articles related to our research between 2010 and 2020 from CiteSeer, IEEE Xplore, Springer and ACM digital libraries. From the 61 articles included in this study, we notice that most of the research papers were focused on the textual content of tweets instead of other data. Furthermore, collaborative filtering methods are seldom used solely in hashtag recommendation. Taking this perspective, we present a taxonomy of hashtag recommendation based on the research methodologies that have been used. We provide a critical review of each of the classes in the taxonomy. We also discuss the challenges remaining in the field and outline future research directions in this area of study.

scholarly journals A Review of the Polymer for Cryogenic Application: Methods, Mechanisms and Perspectives

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 320
Author(s):  
Duo Chen ◽  
Juanzi Li ◽  
Yuhuan Yuan ◽  
Chang Gao ◽  
Yunguang Cui ◽  
...  
Keyword(s):  
Liquid Oxygen ◽  
Future Research ◽  
Research Development ◽  
Thermoplastic Polymers ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Practical Applications ◽  
Application Potential ◽  
Future Research Directions ◽  
Cryogenic Application

Recently, the application of polymer-based composites at cryogenic conditions has become a hot topic, especially in aerospace fields. At cryogenic temperature, the polymer becomes more brittle, and the adverse effect of thermal stress induced by temperature is more remarkable. In this paper, the research development of thermoset and thermoplastic polymers for cryogenic applications are all reviewed. This review considers the literature concerning: (a) the cryogenic performance of modified thermoset polymers and the improving mechanisms of the reported modification methods; (b) the cryogenic application potential of some commercial thermoplastic polymers and the cryogenic performance of modified thermoplastic polymers; (c) the recent advance in the use of polymer for special cryogenic environment-liquid oxygen. This paper provides a comprehensive overview of the research development of the polymer for cryogenic application. Moreover, future research directions have been proposed to facilitate its practical applications in aerospace.

scholarly journals A systematic review of circular economy research in the construction industry

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Oluyomi A. Osobajo ◽  
Adekunle Oke ◽  
Temitope Omotayo ◽  
Lovelin Ifeoma Obi
Keyword(s):  
Systematic Review ◽  
Construction Industry ◽  
Circular Economy ◽  
Research Question ◽  
Methodological Approach ◽  
Future Research ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Content Type ◽  
Future Research Directions

PurposeWhile circular economy (CE) is fast becoming a political and economic agenda for global urban development, there are still substantial knowledge gaps in possible strategies to speed up such transition, especially in the construction industry. This study analyses literature surrounding CE to unpack current trends possible future research directions to foster CE implementation in the construction industry.Design/methodology/approachThe study undertakes a systematic review of CE literature published between 1990 and 2019. It adopts a five-stage procedure as a methodological approach for the review: formulation of the research question(s), locating and identifying relevant studies, selection and evaluation of studies, analysis or synthesis and results reporting.FindingsThe findings on CE research in the construction industry show extensive focus on resource use and waste management. There are limited investigations in other areas of construction such as supply chain integration, building designs, policy, energy efficiency, land use, offsite manufacturing, whole life costing, and risk, cost reduction, cost management, health and safety management. The study findings provide evidence that current CE practice fails to incorporate other areas that would facilitate the network of true circular construction industry.Originality/valueThis research provides a comprehensive overview of research efforts on CE in the construction context, identifying areas of extensive and limited coverage over three decades. Besides, it identifies possible pathways for future research directions on CE implementation, towards the accelerated transition to a true circular construction industry for the benefit of funding bodies and researchers.

The Exposome in the Era of the Quantified Self

2021 ◽  
Vol 4 (1) ◽  
pp. 255-277
Author(s):  
Xinyue Zhang ◽  
Peng Gao ◽  
Michael P. Snyder
Keyword(s):  
High Resolution ◽  
Human Health ◽  
Future Research ◽  
Quantified Self ◽  
Research Directions ◽  
Complex Interactions ◽  
Health And Disease ◽  
Future Research Directions ◽  
Physical Exposures ◽  
External Exposures

Human health is regulated by complex interactions among the genome, the microbiome, and the environment. While extensive research has been conducted on the human genome and microbiome, little is known about the human exposome. The exposome comprises the totality of chemical, biological, and physical exposures that individuals encounter over their lifetimes. Traditional environmental and biological monitoring only targets specific substances, whereas exposomic approaches identify and quantify thousands of substances simultaneously using nontargeted high-throughput and high-resolution analyses. The quantified self (QS) aims at enhancing our understanding of human health and disease through self-tracking. QS measurements are critical in exposome research, as external exposures impact an individual's health, behavior, and biology. This review discusses both the achievements and the shortcomings of current research and methodologies on the QS and the exposome and proposes future research directions.

Legacy to SOA Evolution

2012 ◽  
pp. 40-70 ◽  
Author(s):  
Ravi Khadka ◽  
Amir Saeidi ◽  
Andrei Idu ◽  
Jurriaan Hage ◽  
Slinger Jansen
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Evaluation Framework ◽  
Future Research ◽  
Comprehensive Overview ◽  
Research Directions ◽  
Research Issues ◽  
Methods And Techniques ◽  
Future Research Directions ◽  
Large Research

In the last decade, there have been significant developments in legacy to SOA evolution, and that has resulted in a large research body of which there exists no comprehensive overview. This chapter provides a historic overview, focusing on the methods and techniques used in legacy to SOA evolution. The authors conducted a systematic literature review to collect legacy to SOA evolution approaches reported from 2000 to August 2011. To this end, 121 primary studies were found and evaluated using an evaluation framework, which was developed from three evolution and modernization methods widely used in the software re-engineering domain. The evaluation constitutes the inventory of current research approaches and methods and techniques used in legacy to SOA evolution. The result of the SLR also identifies current research issues in legacy to SOA evolution and provides future research directions to address those research issues.

scholarly journals A Survey of Opponent Modeling in Adversarial Domains

2022 ◽  
Vol 73 ◽  
pp. 277-327
Author(s):  
Samer Nashed ◽  
Shlomo Zilberstein
Keyword(s):  
Method Comparison ◽  
Future Research ◽  
Comprehensive Overview ◽  
Open Problems ◽  
Research Directions ◽  
Opponent Modeling ◽  
Modeling Systems ◽  
Future Research Directions ◽  
Partially Observable ◽  
New Framework

Opponent modeling is the ability to use prior knowledge and observations in order to predict the behavior of an opponent. This survey presents a comprehensive overview of existing opponent modeling techniques for adversarial domains, many of which must address stochastic, continuous, or concurrent actions, and sparse, partially observable payoff structures. We discuss all the components of opponent modeling systems, including feature extraction, learning algorithms, and strategy abstractions. These discussions lead us to propose a new form of analysis for describing and predicting the evolution of game states over time. We then introduce a new framework that facilitates method comparison, analyze a representative selection of techniques using the proposed framework, and highlight common trends among recently proposed methods. Finally, we list several open problems and discuss future research directions inspired by AI research on opponent modeling and related research in other disciplines.

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