Böcker utgivna av Springer Nature Singapore

This book puts forward a new angle of understanding the society of states in the milieu of the contemporary world. The absence of a regulatory mechanism, i.e., anarchy, has been the fundamental issue of international relations. This book explains how the normative imperatives, information and communication technology (ICT) and nuclear deterrence generated ambiance have poised the states in a society where they are bound to follow certain normative imperatives that dilute the color and meaning of anarchy and obliges the states to act in a certain way. It develops a theoretical proposition with regard to state power defined in terms of the capability of determining the outcomes. The proposition first elaborates how international institutions foster normative imperatives; then, in line with this ontology, it narrows down the focus solely on the power of the states in the contemporary world. It explains how the power that can determine the outcome today is holistic in nature, comprising both materialistic and normative factors. In the next step, it tailors the proposition in a way so as to employ it for a specific empirical work. The book does not end just positing the theoretical proposition; the proposition is testified through some case studies with regard to climate negotiations under the UNFCCC.The empirical part not only serves to examine the plausibility of the theoretical proposition, but it also presents the logic of the major actors and the politics with respect to some of the major issues of climate change, i.e., mitigation, funding policy and mechanism and adaptation. The scholars in this arena, climate activists and climate-conscious people in general would find this book worth reading as it kindles a different angle to understand the issues in the context of the contemporary world and as it elaborates the logic, framing process, and mechanism of reaching outcomes through complex negotiation process. No other work has so far analyzed the issues covering the entire period of 21 apex UNFCCC negotiations that led to the Paris Agreement. Apart from university libraries, this book, thus, has the prospect to be sold in the markets targeting the academicians, climate change experts, bureaucrats, negotiators and the common readers.

This book contains select papers on rings, monoids and module theory which are presented at the 3rd International Conference on Mathematics and Statistics (AUS-ICMS 2020) held at the American University of Sharjah, United Arab Emirates, from 6-9 February 2020. This conference was held in honour of the work of the distinguished algebraist Daniel D. Anderson. Many participants and colleagues from around the world felt it appropriate to acknowledge his broad and sweeping contributions to research in algebra by writing an edited volume in his honor. The topics covered are, inevitably, a cross-section of the vast expansion of modern algebra. The book is divided into two sections-surveys and recent research developments-with each section hopefully offering symbiotic utility to the reader. The book contains a balanced mix of survey papers, which will enable expert and non-expert alike to get a good overview of developments across a range of areas of algebra. The book is expected to be of interest to both beginning graduate students and experienced researchers.  

This book incorporates all aspects of hypospadias management, such as step-by-step correction of chordee and modifications in tabularized urethral plate repair, which is the commonest technique used in hypospadias repair, single-stage two-stage repairs of hypospadias with illustrated descriptions. It provides essential information like history, embryology, anatomy, Radiology in hypospadias, and classification of hypospadias. For the first time, this title presents separate chapters about female hypospadias, correction of torsion associated with hypospadias, and chordee without hypospadias. These chapters will improve the understanding of the subject for the reader and help them in modifying their surgical technique for these patients. Hypospadias surgery has a long learning curve, and the book will help the practitioners make them shorter. The book also deals with acute and chronic complications of surgery which will help the reader prevent complications and manage them. This is a complete book covering all aspects of the evaluation & management of hypospadias and their variants. It includes chapters on a healthy interposition and appropriate use of spongiosum and the techniques of spongioplasty, modifications in flap tube repair,  along with the various types of prepuce and prepucioplasty. In conclusion, the book will provide a comprehensive read for all trainees/fellows and practitioners of Urology, Pediatric urology, Pediatric Surgery, and Plastic Surgery.

This evidence-based book focuses on contemporary issues related to human health and well-being. Drawing on the first-hand experiences of academics and researchers, it provides a holistic perspective on the importance of both mental and physical health for quality of life. It is divided into seven sections: changing perspectives on well-being; the mental health of students; the well-being of elderly people and marginalized populations; the role of family and teachers; psycho-social support; the right to health; and future perspectives. Covering current topics, such as the challenges posed by pandemics like COVID-19, the book discusses future strategies for addressing contemporary and emerging health issues and the overall well-being of the general public, an area not covered in any of the previous volumes. Furthermore, it explores the need for the involvement of multidisciplinary professionals in examining general health and well-being issues. Given its scope, it is an indispensable resource for a wide range of professionals and researchers from various fields, such as the social sciences, law, public health, medicine, education, and environmental studies. In addition, the book appeals to health policymakers, educational administrators, law enforcement agencies, as well as health workers, psychologists, and social workers dealing with clients in hospitals, educational institutions, and at the community level.

This book provides a comprehensive overview of the technical notes, research designs, literature, and 3DP (three-dimensional printing) technology applications for effective food printing. It provides a multidisciplinary coverage of 3D food printing in different food sectors.Recent advancements in manufacturing processes have led food industries to create innovations to stay competitive in the market. 3D food printing incorporates 3DP digital gastronomy strategies to manufacture food products with consistency in shape, color, flavor, texture, and even nutrition. Thus, by controlling the number of materials and the quality of nutrients, food items can be manufactured and handled to fulfill their particular requirements. For food printing, both proprietary structures and self-developed frameworks are used from open sources.Similar frameworks are re-engineered to reformulate administration, content creation, and user interface. For example, three printing medium types, natural printable products, non-printable synthetic food products, and alternative ingredients as well as two recipe forms (i.e., element-based recipes and regular recipes) are used for customized food production. The authors address that open 3D technology for food printing and food processing technology are theoretically correlated with food printing.The book will help industrial designers, nutrition professionals, dieticians, manufacturing enterprises, and young researchers in food technology, material science, and mechanical engineering understand the latest advances in 3DP technology in food industries.

This book focuses on how Indigenous knowledge and methodologies can contribute towards the decolonisation of peace and conflict studies (PACS). It shows how Indigenous knowledge is essential to ensure that PACS research is relevant, respectful, accurate, and non-exploitative of Indigenous Peoples, in an effort to reposition Indigenous perspectives and contexts through Indigenous experiences, voices, and research processes, to provide balance to the power structures within this discipline. It includes critiques of ethnocentrism within PACS scholarship, and how both research areas can be brought together to challenge the violence of colonialism, and the colonialism of the institutions and structures within which decolonising researchers are working. Contributions in the book cover Indigenous research in Aotearoa, Australia, The Caribbean, Hawai'i, Israel, Mexico, Nigeria, Palestine, Philippines, Samoa, USA, and West Papua.

This book comprises the select peer-reviewed papers presented at the 7th Indian Young Geotechnical Engineers Conference (7IYGEC 2019) held at the National Institute of Technology, Silchar. It covers recent research developments in geotechnical engineering particularly in the fields of shallow and deep foundations, rock mechanics, ground improvement techniques, geotechnical earthquake engineering, and characterization of soil. The book also discusses several computational techniques to model behavior of soil which can be useful for future research. A special emphasis is given on geo-environmental engineering for making the world cleaner and safer to live. Given the contents, the book will be beneficial for students, researchers, and professionals working in geotechnical engineering and allied areas.

This book presents the state of the skill of understanding brassinosteroids (BRs) signaling plus crosstalk with phytohormone and their association in plant adaptation to abiotic stresses comprising physiological, biochemical, and molecular developments. Due to progressively adverse environmental conditions and scarce natural resources, high-efficient crops have become more important than ever. For the successful improvement of stress-tolerant plants, it is vital to understand the precise signaling appliances that plants practice to abide stresses as well as how much these mechanisms are convinced by phytohormone. However, it is also debatable on which step plants can attain brassinosteroids (BRs) signaling from an evolutionary viewpoint. BRs are involved in modulating a large array of important functions throughout a plant's life cycles. BRs are considered as one of the most important plant steroidal hormones that show a varied role in observing a wide range of developmental practices in plants. Our grip on brassinosteroids signaling has quickly extended over the past two decades, owing in part to the isolation of the constituents intricate in the signal transduction trail. The book proposes a useful guide for plant researchers and graduate students in connected areas.  

The book provides essential information on some of the promising edible medicinal plants and how these possess both nutritional as well as therapeutic value. The significance of the edible plants in traditional medicine and the importance of the distribution of their chemical constituents are discussed systematically concerning the role of these plants in ethnomedicine in different regions of the world. The current volume deals with the individual plants' phytochemical and pharmacological properties, emphasizing human health. The title would demonstrate the value of natural edible plants and introduce readers to state-of-the-art developments and trends in omics-driven research.This book is a single-source scientific reference to explore the specific factors that contribute to these potential health benefits and discuss how to maximize those potential benefits. Chemists, food technologists, pharmacologists, phytochemists, and all professionals involved with quality control and standardization will find in this book a valuable and updated basis for their work.

This book is written by international experts with both academic and industrial credentials. It presents for the first time, a collection of up-­to-­date scientific advances in the area of edible fats and oils technology, over a span of 10 years from 2009 to the year 2019. The book covers the existing and recent advanced techniques adopted in the edible fats and oils research and touches on the processing and modification, to the traceability and sustainability issues of fats and oils. Some recent technologies like supercritical carbon dioxide, microwave, ultrasound, and enzymatic¿ assisted processes, ionic liquid, enzymatic processes, biosensor and membrane technology are presented in the book. The book aims to provide the technologists and researchers in research, development and operations in the edible fats and oils industries with critical and readily accessible information on the recent advances in the field. The book is divided into three broad sections- Fats and Oils Chemistry and Processing, Fats and Oils Modification and Health Implications, and Fats and Oils Safety, Social, Environmental and Economic Impacts. It is an extremely comprehensive and valuable resource, which serves as an essential reference for students and lipid scientists from academia or industry.

The book is the first to explore the history and political significance of the Japanese public housing program. In the 1960s, as Japan's postwar economy boomed, architects and urban planners inspired equally by Western modernism and Soviet ideas of housing as a basic right created new cityscapes to house populations turned into refugees by the war. Over time, as Japan's society aged and the economy began to stagnate, these structures have become a burden on society. In this closely researched monograph on the conditions of Japanese housing, Tatiana Knoroz sheds unexpected light on the rise and fall of the idea of social democracy in Japan which will be of interest to historians, architects, and scholars of Asian economic modernization.

This book provides a comprehensive summary of the latest knowledge regarding functional foods and new therapeutic strategies for neurodegenerative disorders through explaining specific mechanisms for natural remedies and functional foods as well as alternative treatment and supplementary approaches for neurodegenerative diseases. Many relevant topics are covered, including role of prebiotics, recent applications for dietary polyphenols, marine bioactive compounds for neuro disorders, and age-related disorders. The roles of various remedies and functional foods are explained for various types of diseases, and the book also integrates the role of functional foods and remedies to work with the current therapeutics that are taking place. In parallel, the information presented through this book will also stimulate current status of leading contemporary methods for prohylactic and diagnostic practices, comprising nanoparticles, biomarkers, in silico techniques, and CRISPR-mediated genome editing-based therapy. The book will be essential reading for students and researchers with an interest in natural medicine, drug development, and food therapeutic strategies. In presenting new results and approaches and identifying areas for future research, it will also be of benefit for specialists in the field.

This book (Vol. II) presents select proceedings of the first Online International Conference on Recent Advances in Computational and Experimental Mechanics (ICRACEM 2020) and focuses on theoretical, computational and experimental aspects of solid and fluid mechanics. Various topics covered are computational modelling of extreme events; mechanical modelling of robots; mechanics and design of cellular materials; mechanics of soft materials; mechanics of thin-film and multi-layer structures; meshfree and particle based formulations in continuum mechanics; multi-scale computations in solid mechanics, and materials; multiscale mechanics of brittle and ductile materials; topology and shape optimization techniques; acoustics including aero-acoustics and wave propagation; aerodynamics; dynamics and control in micro/nano engineering; dynamic instability and buckling; flow-induced noise and vibration; inverse problems in mechanics and system identification; measurement and analysis techniques in nonlinear dynamic systems; multibody dynamical systems and applications; nonlinear dynamics and control; stochastic mechanics; structural dynamics and earthquake engineering; structural health monitoring and damage assessment; turbomachinery noise; vibrations of continuous systems, characterization of advanced materials; damage identification and non-destructive evaluation; experimental fire mechanics and damage; experimental fluid mechanics; experimental solid mechanics; measurement in extreme environments; modal testing and dynamics; experimental hydraulics; mechanism of scour under steady and unsteady flows; vibration measurement and control; bio-inspired materials; constitutive modelling of materials; fracture mechanics; mechanics of adhesion, tribology and wear; mechanics of composite materials; mechanics of multifunctional materials; multiscale modelling of materials; phase transformations in materials; plasticity and creep in materials; fluid mechanics, computational fluid dynamics; fluid-structure interaction; free surface, moving boundary and pipe flow; hydrodynamics; multiphase flows; propulsion; internal flow physics; turbulence modelling; wave mechanics; flow through porous media; shock-boundary layer interactions; sediment transport; wave-structure interaction; reduced-order models; turbo-machinery; experimental hydraulics; mechanism of scour under steady and unsteady flows; applications of machine learning and artificial intelligence in mechanics; transport phenomena and soft computing tools in fluid mechanics. The contents of these two volumes (Volumes I and II) discusses various attributes of modern-age mechanics in various disciplines, such as aerospace, civil, mechanical, ocean engineering and naval architecture. The book will be a valuable reference for beginners, researchers, and professionals interested in solid and fluid mechanics and allied fields.

This book covers a wide range of the issues in development studies. Recognizing the existence of manifold challenges in achieving and sustaining economic development, it is divided into four sections-(i) The Macroeconomy: Foreign Trade, Structural Transition and the Environment, (ii) Health and Standard of Living, (iii) Education, Human Capital and Evolution of the Employment Quality in India, and (iv) Banking and Credit: Access, Efficiency and Stability. The book brings together a right mix of senior and young economists who use cutting edge econometric techniques and/ or revisit a perennial question with much sharper focus and tools to unravel insights that are important and will inform tomorrow's theorisation and policy making. The volume looks at important questions like spatial concentration of low infant and child health outcomes, trade liberalisation and export quality, intergenerational occupational mobility, multidimensional poverty incidence in rural India, robustness of the banking sector, to name a few. To do so, the contributions use novel and esoteric methods like machine learning, spatial econometrics, system GMM, quintile regression and counterfactual decomposition (QRCD), and so on. The rich collection holds importance for researchers and policy makers alike, and also for practitioners working in different developmental sectors..

This book is a collection of extended versions of papers presented at the KES Covid-19 Challenge international summit. The book focusses on technological, economic, and social developments to combat the effects of global and local disasters as well as the ways in which the recovery from Covid can be used to build more resilient and sustainable communities, industry, and improve the environment. It also discusses the global challenges of human-influenced climate change. There are chapters on making cities and communities more resilient through energy self-sufficiency, food production, resilient housing and buildings, human health and intelligent systems e.g. for forecasting and prediction.

This book is a collection of comprehensive reviewed chapters covering major physiological aspects, both production as well as biochemical aspects, of a plant under low temperature stress. Low temperature stress has been dealt in two parts, first between 10 to 00 C and secondly between 0 to -400 C. This book highlights the physiological aspects of plants under low temperature stress and explains the various adaptive measures plants undergo to tolerate low temperature stress. Essential information is provided on germination, growth and development, dry matter accumulation, partitioning and final yield of a crop plant. As physiology deals with morphological and biochemical aspect of all the basic processes, therefore an in depth understanding the major physiological issues in plants under high temperature will help plant breeders to tailor different crop plants with desirable physiological traits to do better under higher temperature. The present book is intended to cover the effects of low temperature stress on the various physiological aspects in plants. Not only in production physiology, this book also deals with major biochemical processes, like photosynthesis, nitrogen and lipid metabolism, mineral nutrition and plant growth hormones. Efforts have been made deal with different measures to mitigate the effects of low temperature stress on plants. This book will be an asset for post graduate students, faculty members, researchers engaged in not only in physiological studies but also agronomy, plant breeding and like subjects. In depth analysis of the major physiological processes in plants under low temperature stress that are presented in this book will help plant breeders for tailoring crops for desirable physiological traits needed to survive and to give better economic return under the threats of low temperature stress. This book is also helpful for policy planners and industries engaged in agribusiness in short term as well as long term gain.

The book presents the state of the art of the Internet of Things (IoT), applied to Human-Centered Design (HCD) projects addressed to ageing users, from the perspective of health, care and well-being. The current focus on the ageing population is opening up new opportunities for the development of niche solutions aimed at the niche category of older users who are beginning to experience physical and cognitive decline but are still independent and need to maintain their autonomy for as long as possible. The combination between the needs expressed by older users and the opportunities offered by the recent innovative technologies related to the Internet of Things allows research institutions, stakeholders, and academia to target and design new solutions for older users, safeguarding their well-being, health, and care, improving their quality of life. This book discusses and analyses the most recent services, products, systems and environments specifically conceived for older users, in order to enhance health, care, well-being and improve their quality of life. This approach is coherent with the percept of AAL or enhanced living environment, looking to the users' comfort, autonomy, engagement and healthcare. The book describes and analyses aspects of HCD with older users looking to the emerging technologies, products, services, and environments analysed in their actual application in different areas, always concerning the design for the elderly related to the IoT, just as the development of biomonitoring devices, tools for activity recognition and simulation, creation of smart living environments, solutions for their autonomy, assistance and engagement enhancing health, care and wellbeing. The book is intended for researchers, designers, engineers, and practitioners in healthcare to connect academia, stakeholders, and research institutions to foster education, research and innovation.

This book provides a comprehensive description of topological polymers, an emerging research area in polymer science and polymer materials engineering. The precision polymer topology designing is critical to realizing the unique polymer properties and functions leading to their eventual applications. The prominent contributors are led by Principal Editor Yasuyuki Tezuka and Co-Editor Tetsuo Deguchi. Important ongoing achievements and anticipated breakthroughs in topological polymers are presented with an emphasis on the spectacular diversification of polymer constructions. The book serves readers collectively to acquire comprehensive insights over exciting innovations ongoing in topological polymer chemistry, encompassing topological geometry analysis, classification, physical characterization by simulation and the eventual chemical syntheses, with the supplementary focus on the polymer folding, invoked with the ongoing breakthrough of the precision AI prediction of protein folding. The current revolutionary developments in synthetic approaches specifically for single cyclic (ring) polymers and the topology-directed properties/functions uncovered thereby are outlined as a showcase example. This book is especially beneficial to academic personnel in universities and to researchers working in relevant institutions and companies. Although the level of the book is advanced, it can serve as a good reference book for graduate students and postdocs as a source of valuable knowledge of cutting-edge topics and progress in polymer chemistry.

This book highlights recent advance in the area of Machine Learning and IoT, and their applications to solve societal issues/problems or useful for various users in the society. It is known that many smart devices are interconnected and the data generated is being analyzed and processed with machine learning models for prediction, classification, etc., to solve human needs in various sectors like health, road safety, agriculture, and education. This contributed book puts together chapters concerning the use of intelligent techniques in various aspects related to the IoT domain from protocols to applications, to give the reader an up-to-date picture of the state-of-the-art on the connection between computational intelligence, machine learning, and IoT.

This book illustrates the significance of various optical spectroscopy and microscopy techniques, including absorption spectroscopy, fluorescence spectroscopy, infrared spectroscopy, and Raman spectroscopy for deciphering the nature of biological molecules. The content of this book chiefly focuses on (1) the principle, theory, and instrumentation used in different optical spectroscopy techniques, and (2) the application of these techniques in exploring the nature of different biomolecules (e.g., proteins, nucleic acids, enzymes, and carbohydrates). It emphasizes the structural, conformational and dynamic, and kinetic including the changes in biomolecules under a range of conditions. In closing, the book summarizes recent advances in the field of optical spectroscopic and microscopic techniques.

Dieses Buch ist eine kurze Geschichte des chinesischen Vorgehens gegen die großen Technologieunternehmen des Landes, das im Jahr 2020 begann. Das Buch erörtert den politischen und wirtschaftlichen Kontext und zeigt die Grenzen der Macht des Staates auf. Da sich die Politik des "gemeinsamen Wohlstands" weiter entwickelt, wird dieses Buch ein unschätzbares Nachschlagewerk für Wirtschaftswissenschaftler sein, die sich entweder mit China, dem Internet und Big Tech oder beidem beschäftigen.

Dieses Buch konzentriert sich auf die Beteiligung und Interaktion der drei Großmächte - China, Russland und die Vereinigten Staaten - in arktischen Angelegenheiten aus der Perspektive der internationalen Beziehungen. Der globale Klimawandel ist zu einem gemeinsamen Problem für die gesamte Menschheit geworden. Eines seiner Schlüsselelemente ist die Erwärmung der Arktis, die sich auf alle Dimensionen der Natur und der Menschheit weltweit auswirkt. Der Klimawandel in der Arktis wird direkte Auswirkungen auf natürliche Ökosysteme, Küstengebiete, Wälder, Wasserressourcen, landwirtschaftliche Produktion, Viehzucht, Tourismus und andere wirtschaftliche Aktivitäten in verschiedenen Ländern rund um den Globus haben. Für die nordostasiatische Region stellt die Öffnung der Arktispassage durch das schmelzende Meereis jedoch eine Chance dar. Das derzeitige internationale Rechtssystem für die Verwaltung der Arktis ist unzureichend, um die Herausforderungen der globalen Erwärmung zu bewältigen. Dieses Buch wird für Wissenschaftler von Interesse sein, die die künftige Entwicklung der Arktis und die Rolle Chinas als Neuankömmling in arktischen Angelegenheiten verfolgen.

This book aims to empirically and theoretically study how the economic growth and inequality affected China's rural poverty since China's reform and opening-up. Apart from the trickle-down effect, some empirical researches show that rising inequality usually links with unfairly shared of the economic growth, which is not good for the poor, and this book particularly concerns with the impact of inequality on poverty reduction. In 11 chapters, it leads readers to review the dynamic changes of rural poverty in China, and estimates rural poverty by various methods, for instance, with analysis by monetary poverty (including income and expenditure poverty), multidimensional poverty, absolute poverty, and relative poverty. Especially attention is paid to apply the "growth-inequality-poverty triangle" model for long-term poverty dynamic changes evaluation. The book revisits poverty reduction strategies in different development periods for rural China and evaluates the poverty eradication achievements stage-by-stage under different analytical methods, in order to provide an objective assessment. Among the chapters, pro-poor growth, Shapley decomposition, poverty elasticity, density estimation, multidimensional poverty analysis, and policy simulation methods are applied for both national wide discussion and rural sub-group heterogeneity analysis. In addition to students, teachers, and researchers in the areas of development, economic growth, equity, and welfare, the book is also of great interest to policy makers, planners, and non-government agencies who are concerned with understanding and addressing poverty-related issues in the developing countries.

This book focuses on learning and adapting nonlinear geometry tool in rock engineering through fractal theories, hypotheses, algorithm, practical understandings, and case studies. Understanding self-similarity and self-affinity is a prerequisite to the fractal model in rock mechanics. The book aims to provide a guide for the readers seeking to understand and build nonlinear model by fractal algorithm. The book is motivated by recent rapid advances in rock engineering in China including application of fractal theory, in addition to percolation theory. It is an essential reference to the most promising innovative rock engineering. Chapters are carefully developed to cover (1) new fractal algorithms (2) five engineering cases. This authored book addresses the issue with a holistic and systematic approach that utilizes fractal theory to nonlinear behavior in rock engineering.The book is written for researchers interested in rock and geological engineering as well as organizations engaged in underground energy practices.

This book investigates the analytical framework and hybrid precoding scheme in millimeter-wave networks. Millimeter-wave communication is a frontier technology for supporting ultra-high data rate transmissions in future wireless networks due to larger bandwidth and higher spectral efficiency. However, the involved interference characterization and increased energy consumption are two dominant limitations in millimeter-wave network evolution. In this monograph, we develop a unified analytical framework for large-scale millimeter-wave communication networks, which leads to abundant network design insights and guidelines. Under this framework, we design low-complexity hybrid precoding algorithms for millimeter-wave systems, which greatly reduce energy consumption without obvious performance degradation.We would like to highlight that we develop a unified analytical framework and low-complexity hybrid precoding mechanisms for millimeter-wave communication networks, where a variety of millimeter-wave properties and hardware constraints are incorporated. The developed mechanisms can provide abundant insights and guidelines for the hybrid precoding design and analysis in millimeter-wave communication networks. Graduate students, researchers, and engineers in the field of communication networks can benefit from the book.

This book provides a comprehensive reference in large data center networking. It first summarizes the developing trend of DCNs, and reports four novel DCNs, including a switch-centric DCN, a modular DCN, a wireless DCN, and a hybrid DCN. Furthermore another important factor in DCN targets at managing and optimizing the network activity at the level of transfers to aggregate correlated data flows and thus directly to lower down the network traffic resulting from such data transfers. In particular, the book reports the in-network aggregation of incast transfer, shuffle transfer, uncertain incast transfer, and the cooperative scheduling of uncertain multicast transfer.