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As interest in the public health challenge of youth inactivity increases, the ambitious Youth Physical Activity and Sedentary Behavior sets a standard for addressing a problem with worldwide implications. Drawing on the contributions of a diverse group of international experts, this reference challenges professionals, researchers, and students to implement new solutions and further their research and work.  No other text addresses the causes, contributing factors, and fundamental issues in dealing with youth physical activity with such depth or comprehensive coverage. Using a multidisciplinary approach, Youth Physical Activity and Sedentary Behavior breaks away from traditional thinking that places activity and sedentary behavior on a single continuum, which may limit progress in addressing youth inactivity. Instead, the authors encourage readers to focus on how sedentary and physically active behaviors coexist and consider how the two behaviors may have different determinants. In doing so, the text also considers developmental features such as maturation, ethnicity, environment, and genetics across both childhood (through age 12) and adolescence (the teen years). By looking at a variety of psychosocial and epidemiological factors, the authors set the stage for a critical analysis of beliefs and views at a time when many assumptions are taken for granted.  This book is organized in three parts that build on one another to deepen readers' understanding of this complex problem. This text begins by addressing the fundamental issues and assumptions pertaining to youth physical activity and sedentary behavior, covering such topics as measurement of the behavior in question, health outcomes, concepts, and trends in a public health context. Once readers have grasped this foundational knowledge, they advance to part II for a comprehensive account of personal factors likely to be associated with the problem. Part III moves beyond the individual into the wider social and contextual aspects of physically active and sedentary living in young people. Through this concluding part, readers gain the latest thinking on how parents, peers, schools, organized sport, and related factors link to youth physical activity and sedentary behavior.             Each chapter presents the latest theory and research, real-world approaches to implementation, and background information to encourage discussion and future directions in national policy making. Youth Physical Activity and Sedentary Behavior also contains the following features that add to an unprecedented learning experience: •An at-a-glance look at why and how research can be used in the real world helps researchers relate their work to overall solutions. •Coverage of more issues related to this subject than are available in any other reference makes this a one-stop resource.   •Internationally respected foreword writer, editors, and contributors provide a cross-disciplinary perspective valuable for putting solutions into a wider context. •Applications for Professionals boxes and Applications for Researchers boxes at the end of each chapter provide practical suggestions for implementing solutions.   Youth Physical Activity and Sedentary Behavior: Challenges and Solutions considers current research about youth physical activity and sedentary behavior across a range of personal factors as well as cultural and social influences. The text communicates the knowledge base on developmental, economic, psychological, and social factors related to youth physical activity and sedentary behavior and provides an overview of youth-specific approaches to addressing the problem of inactivity among youth.

Much has been said and written about the abilities of modern instrumentation to help solve problems of combustion in engines. In the main, however, the design and fabr ication of combustion chambers continues to be based on extrapolation of exper ience gained from use and rig tests, with little input from advanced techniques such as those based on optical diagnotics. At the same time, it has become increasingly difficult to design better combustion chambers without knowledge of the relevant flow processes. Thus, the future must involve improved understanding which, in turn, will require detailed measurements of velocity, temperature and concentration. The need to narrow the gap between current industrial practice and the acquisition and implementation of improved techniques motivated the organization of the Advanced Study Institute upon which this volume is based. This Institute on Instrumentation for Combustion and Flow in Engines was arranged to display the needs of industry and the possibilities made available by modern instrumentation and, at the same time, to make clear the relative advantages of optical and probe techniques. Held at Vimeiro during the period from 13 to 26 September, 1987, the Institute was attended by 120 participants and 16 invited lecturers.

Limnology - the study of inland waters - had its genesis in Europe about the turn of the century. The studies of Fore1 on Lake Geneva were of seminal value at this time. It prospered under the early guidance of Thienemann, Naumann and Wesenberg-Lund in Europe and, soon transplanted, of Birge and Juday in North America (to name just a few early spirits). Now, liminology is a respectable scientific discipline taught at many universities, and limnologists are recognized as important contributors to our understanding of how this fragile spaceship functions. All this acknowledged, it must also be acknowledged that limnology is not yet a globally comprehensive science. To be sure, much is known about globally applicable processes, and the structural elements of aquatic ecosystems worldwide, but limnological emphases, interests and concerns remain essentially European and North American in balance. Much is known about lakes and rivers in less than one fifth of the world's land area (northern temperature regions); rather little is known about inland waters elsewhere.

This series will include monographs and collections of studies devoted to the investigation and exploration of knowledge, information, and data-processing systems of all kinds, no matter whether human. (other) animal, or machine. Its scope is intended to span the full range of interests from classical problems in the philosophy of mind and philosophical psychology through issues in cognitive psychology and sociobiology (concerning the mental capabilities of other species) to ideas related to artificial intelligence and computer science. While primary emphasis will be placed upon theoretical, conceptual, and epistemological aspects of these problems and domains, empirical, experimental, and methodological studies will also appear from time to time. No problem within the field of cognitive inquiry is more difficult than that of developing an adequate conception of the nature of mind and of its mode of operation. Our purpose in compiling the present volume has been to contribute to the pursuit of this objective by bringing together a repre­ sentative cross-section of the principal approaches and the primary players who are engaged in contemporary debate on these crucial issues. The book begins with a comprehensive introduction composed by David Cole, the senior editor of this work, which provides a background for understanding the major problems and alternative solutions, and ends with a selected bibliography intended to promote further research. If our efforts assist others in dealing with these issues, they will have been worthwhile. J. H. F. David J. Cole et at. (eds. ), Philosophy, Mind, and Cognitive Inquiry, ix.

This book brings together research into the process of stream acidification and its impact on Welsh surface waters, carried out over the past decade or so. It is perhaps surprising that not until the 1980's was clear evidence of stream acidification assembled. In Wales, concerns over pollution had focused water quality sampling principally on the areas of traditional heavy industry and large urban popula­ tions served by inadequate sewerage systems and sewage disposal arrange­ ments. Mistakenly, it had been assumed that, with its prevailing westerly winds, Wales would receive precipitation substantially unpolluted by the industrial and urban emissions from Britain and mainland Europe. Assurance of the high quality of Welsh upland streams, the traditional nursery ground of salmonids, was eroded particularly by studies in the vicinity of Llyn Brianne reservoir in the catchment of the River Tywi of Central Wales. These demonstrated a clear correspondence between the biological quality and fisheries of streams in the catchment and aspects of stream chemistry, par­ ticularly pH, aluminium and calcium on the one hand, and catchment land­ use on the other. It is salutary to record that the first signals were of an inexplicable failure of the runs of migratory salmonids into the upper catchment, occupied by the Llyn Brianne reservoir and its influent streams, and the failure to restore the fishery by re-stocking with eggs and fry. Only then did the significance of the recent decline in some other upland lake and reservoir fisheries in Wales become apparent.

This series will include monographs and collections of studies devoted to the investigation and exploration of knowledge, information, and data­ processing systems of all kinds, no matter whether human, (other) animal, or machine. Its scope is intended to span the full range of interests from classical problems in the philosophy of mind and philosophical psycholo­ gy through issues in cognitive psychology and sociobiology (concerning the mental capabilities of other species) to ideas related to artificial in­ telligence and to computer science. While primary emphasis will be placed upon theoretical, conceptual, and epistemological aspects of these prob­ lems and domains, empirical, experimental, and methodological studies will also appear from time to time. The perspective that prevails in artificial intelligence today suggests that the theory of computability defines the boundaries of the nature of thought, precisely because all thinking is computational. This paradigm draws its inspiration from the symbol-system hypothesis of Newell and Simon and finds its culmination in the computational conception of lan­ guage and mentality. The "standard conception" represented by these views is subjected to a thorough and sustained critique in the pages of this book. Employing a distinction between systems for which signs are signif­ icant for the users of a system and others for which signs are significant for use by a system, I have sought to define the boundaries of what AI, in principle, may be expected to achieve.

This series will include monographs and collections of studies devoted to the investigation and exploration of knowledge, information, and data­ processing systems of all kinds, no matter whether human, (other) animal, or machine. Its scope is intended to span the full range of interests from classical problems in the philosophy of mind and philosophical psycholo­ gy through issues in cognitive psychology and sociobiology (concerning the mental capabilities of other species) to ideas related to artificial in­ telligence and to computer science. While primary emphasis will be placed upon theoretical, conceptual, and epistemological aspects of these prob­ lems and domains, empirical, experimental, and methodological studies will also appear from time to time. The perspective that prevails in artificial intelligence today suggests that the theory of computability defines the boundaries of the nature of thought, precisely because all thinking is computational. This paradigm draws its inspiration from the symbol-system hypothesis of Newell and Simon and finds its culmination in the computational conception of lan­ guage and mentality. The "standard conception" represented by these views is subjected to a thorough and sustained critique in the pages of this book. Employing a distinction between systems for which signs are signif­ icant for the users of a system and others for which signs are significant for use by a system, I have sought to define the boundaries of what AI, in principle, may be expected to achieve.

IA U Symposium Number 141 "Inertial Coordinate System on the Sky" was held in Leningrad, USSR from 17-21 October 1989. The symposium also commemorated the 150th anniversary of the founding of Pulkovo Observatory. The scientific program was presented in ten half-day sessions. Most sessions were held at the Pulkovskaya Hotel, but one session which highlighted Pulkovo's current programs was held at Pulkovo Observatory. The sessions were organized into general categories pertaining to the legacy of Pulkovo for inertial systems; current programs at Pulkovo Observatory; concepts, definitions and models; and the realization and comparision of reference frames. More than 140 scientific papers were presented, either orally or in poster form. Extensive use was made of electronic mail and computer-readable communications, and more than two-thirds of the authors made use of the opportunity to submit papers for formatting by the editors. The meeting was truly a symposium in the Greek sense of the word-a free-flowing exchange of ideas and opinions. The final two papers presented at the symposium by Wilkins and by Westerhout are presented at an eady stage in the published proceedings, in order to help focus the reader's attention on the concepts and problems explored in subsequent papers. As pointed out by G.

This series will include monographs and collections of studies devoted to the investigation and exploration of knowledge, information, and data-processing systems of all kinds, no matter whether human, (other) animal, or machine. Its scope is intended to span the full range of interest from classical problems in the philosophy of mind and philosophical psychology through issues in cognitive psychology and sociobiology (concerning the mental powers of other species) to ideas related to artificial intelligence and computer science. While primary emphasis will be placed upon theoretical, conceptual, and epistemological aspects of these problems and domains, empirical, experimen­ tal, and methodological studies will also appear from time to time. The present volume reflects the kind of insights that can be obtained when research workers in philosophy, artificial intelligence, and computer science explore problems of common concern. The issues here tend to fall into two broad but varied sets, namely: those concerned with content and concepts, on the one hand, and those concerned with semantics and epistemology, on the other. The collection begins with a prologue that focuses upon the relations between connectionism and alternative conceptions of nativism and ends with an epilogue that examines the significance of alternative conceptions of the Frame Problem for artificial intelligence. Because these papers are rich and diverse, they ought to appeal to a wide and heterogeneous audience. J.H.F.

The Conference on Algebraic Geometry, held in Berlin 9-15 March 1988, was organised by the Sektion Mathematik of the Humboldt-Universitat. The organising committee consisted of H. Kurke, W. Kleinert, G. Pfister and M. Roczen. The Conference is one in a series organised by the Humboldt-Universitat at regular intervals of two or three years, with the purpose of providing a meeting place for mathematicians from eastern and western countries. The present volume contains elaborations of part of the lectures presented at the Conference and some articles on related subjects. All papers were subject to the regular refereeing procedure of Compositio Mathematica, and H. Kurke acted as a guest editor of this journal. The papers focus on actual themes in algebraic geometry and singularity theory, such as vector bundles, arithmetical algebraic geometry, intersection theory, moduli and Hodge theory. We are grateful to all those who, by their hospitality, their presence at the Con­ ference, their support or their written contributions, have made this Conference to a success. The editors Compositio Mathematica 76: viii, 1990.

This book consists of papers prepared for and presented at a NATO sponsored Advanced Study Institute which was held in Montechoro, Portugal during the period 16-27 April, 1990. This Institute was attended by approximately ninety delegates from fifteen countries and followed from a related Institute held in Vimeiro, Portugal in 1987 (see the book entitled "Instrumentation for Combustion and Flow in Engines", edited by D. F. G. Dur~o, J. H. Whitelaw and P. O. Witzel. The purposes of the first Institute related closely to instrumentation for use in gas-turbine combustors and the cylinders of internal-combustion engines. These topics were also addressed in the second Institute, though in a manner which was wider ranging and chosen to demonstrate and explain the development and application of measurement methods to combusting flows in general. The papers contained in this boo~ were selected to provide the reader with a comprehensive and up-to-date view of the variety of experimental techniques available to measure in combusting flows. Included are discussions of their range and applicability, potential accuracy and ease of use. Thus, the first paper provides a brief overview and the second an indication of those aspects of combustion which should influence the choice of flow property to be measured and the technique to be used.

This volume provides a full account of the many exciting recent advances in both observational and theoretical research on sunspots and is intended to serve as a monograph on the subject. It contains 18 review articles on various aspects of the physics of sunspots, each of which is an expanded version of an invited review paper presented at the NATO ARW on the Theory of Sunspots in 1991. Chapters on starspots and on the relation between sunspots and the global-solar-magnetic field and the solar cycle place the subject in a broader astrophysical context. An extensive introductory chapter by the editors presents an overall view of modern research on sunspots from a historical perspective, with a comprehensive list of references, and makes this book suitable for students and nonspecialist, as well as the sophisticated reader.

Among the most important problems confronting computer science is that of developing a paradigm appropriate to the discipline. Proponents of formal methods - such as John McCarthy, C.A.R. Hoare and Edgar Dijkstra - have advanced the position that computing is a mathematical activity and that computer science should model itself after mathematics. Opponents of formal methods - such as Richard DeMillo, Richard Lipton and Alan Perlis - by contrast, suggest that programming is the activity which is fundamental to computer science and that there are important differences that distinguish it from mathematics, which therefore cannot provide a suitable paradigm. Disagreement over the place of formal methods in computer science has recently arisen in the form of renewed interest in the nature and capacity of programme verification as a method for establishing the reliability of software systems. A paper that appeared in Communications of the ACM, entitled "Programme Verification: The Very Idea", by James H.Fetzer, triggered an extended debate that has been discussed in several journals and that has endured for several years, engaging the interest of computer scientists (both theoretical and applied) and of other thinkers from a wide range of backgrounds who want to understand computer science as a domain of inquiry.

The papers in this book are organized as follows: insect-plant communities, host-plant selection, genetics and evolution, host-plant resistance and application of transgenic plants, and multitrophic interactions. Besides seven invited papers and a paper with concluding remarks, this volume also contains the short communications of all 115 oral presentations and posters. Included, too, are the summaries of four European Science foundation workshops held over the past two years, where European scientists discussed the state of the art and the future of major topics in insect-plant interactions in order to develop better integrated research programmes. The field of insect-plant interactions nowadays includes almost all of biology, as well as parts of chemistry and physics. It takes a central position in biology because insects are the most abundant animal group, half of them are herbivores and they dominate all terrestrial ecosystems. Knowledge of insect-plant interactions is thus fundamental to an understanding of the evolution of life on Earth. Two major topics of world-wide concern give this field an extra dimension.First, large amounts of food crops are still lost due to insect pests. With the increasing concern for environmental pollution and the subsequent plans to drastically reduce pesticides, integrated pest management and development of resistant crops become a major focus in agriculture. The importance of the study of insect-plant relationships is thus continuously augmented. Clearly, successful pest control demands sufficient fundamental knowledge of post-host interactions. Second, such work can contribute towards stopping or even counterbalancing the threatening biodiversity crisis thanks to an understanding of how the interaction of insects and plants has influenced and still influences the diversification and speciation (evolution) of both groups. These problems should, of course, be approached at a multitrophic level.

2 During our formative years with Dr. Krebs at Davis, ed until the ER becomes substantially depleted of Ca +. California, we (c. and M. Brostrom) were imbued with For example, acute exposure of GH3 pituitary cells to 2 2 our continuing interest in the roles of Ca+ and cAMP in Ca+ ionophore A23187 or EGTA has been found to re- biological control mechanisms. We remember our time sult in the inhibition of amino acid incorporation. disap- with Dr. Krebs with great affection both for his intense pearance of polysomal content with accumulation of interest and high standards in science and for his great monosomes and ribosomal subunits. sharp reduction of decency in the treatment of postdoctoral fellows. We the cellular content of 43S pre initiation complex. and have subsequently aspired, within the constraints of our the phosphorylation of elF-2ex and inhibition of eIF-2B ability, to pattern our behavior in accord with this expe- [15-17]. Neither translational elongation nor peptide rience.Our current research involving the control of chain termination appeared to be affected in these ex- protein synthesis at mRNA translation embodies much periments, since average ribosomal transit times and the methionylation of tRNA;met were not altered. Amino of the familiar in protein phosphorylation with some new twists that we shall highlight in this article with our acid incorporation was unaffected during the period of 2 associate. Dr. Prostko. Ca+ release prior to suppression of initiation.

This text examines the non-CO2 greenhouse gases (NCGGs), notably methane, nitrous oxide, CFCs, HCFCs and HFCs and tropospheric ozone and its precursors. It covers all aspects of these components in global warming and discusses possible remedies. It also contains the Conference Statement, which summarizes our present knowledge. The book includes studies directed towards sources and sinks of NCGGs, atmospheric measurements and documents the OECD/IPCC methodology for emission inventories and some applications. Studies on the modelling of global budgets reflect our present understanding of the atmosphere. The helpful reports on methods to curb the emissions of the NCGGs, as well as on policy approaches to their support, including those of the European Union, the Netherlands, and the UN Food and Agricultural Organization, should make this book a valuable resource text for scientists, engineers, consultants, policy-makers and politicians involved in the interdisciplinary problems of global warming. Both an author register and keyword register are included.

The role of energy in the modern world goes beyond mere technology and economics to influence welfare, the environment, the quality of life and, in broad terms, civilization itself. Since the Industrial Revolution, energy conservation technology has been at the forefront of the innovation required to satisfy the needs of mankind and, more than any other, this technology has always depended on the performance of the materials used. In this, the report of the Fifth Liege Conference devoted to a review of the work of the European Materials Collaborative Programmes, the results of the programmes are presented along the following technology-oriented themes: steam-power plant; gas turbines; diesel engines; advanced combustion; and perspectives. The book thus presents an up-to-date reference on materials technologies in energy conversion from fossil fuels and materials for high-efficiency, low-emission systems.

Homogeneous catalysis plays an important role both in the laboratory and in the industry. Successful applications in industry involve new polymerisation processes with complexes of zirconium and related metals, new carbonylation processes employing palladium and rhodium, ring opening polymerisations, and new enantioselective isomerisation catalysts as in the preparation of menthol. Also in the synthesis of organic compounds in the laboratory highly selective homogeneous catalysts represent an irreplaceable part of the toolbox of the synthetic chemist. Examples of such reactions are cross-coupling (Ni, Pd), nucleophilic substitution of allylpalladium complexes, Heck reactions (Pd), asymmetric epoxidation, Wacker type reactions (Pd), asymmetric hydrogenations (Rh, Ru), reactions of chromium complexes, enantioselective reactions with Lewis acids, reactions with the McMurry reagent, etc. There is hardly any multistep organic synthesis that does not involve one of these metal catalysed reactions. Most of these catalysts have been developed by empiricism.The metal catalysed processes consist of a series of elementary steps which often have been studied in isolation in organometallic chemistry. The knowl- edge of such elementary steps - effect ofligands, anions, coordination number, valence states - has greatly contributed to the development of improved cata- lysts for the reactions mentioned above. In addition to the empirical approach theoretical methods have given support and guidance to the development of improved processes. Often the key steps of a cycle escape from a direct ob- servation and then theoretical contributions are even more wanted.

How diverse or potentially overlapping are the numerous self-models, self-theories, and directions of self-research? It has become clear that the processes associated with the self are complex and diverse, and that many of the approaches associated with the self have been pursued in isolation. Moreover, the fact of there being different traditions within developmental and social psychology, as well as different traditions in Europe and North America, has also led to a certain cacophony when we examine the self-field as a whole. The chapters here confront these differences, trying to come to terms with phenomena that are overarching, that extend through the dimensions of developmental psychology, social psychology, motivation psychology, and parts of clinical psychology. The book as whole gives a clear presentation of the issues, questions and phenomena that surface in research fields known as self psychology.

This work is divided into three parts: combustion-induced oscillations; internal combustion engines; and experimental techniques and modelling. Part 1 of the book deals with combustion instabilities, pulsed combustors, and active control of unsteady motions, and constitutes a survey of the range of problems central to combustion instabilities. Internal combustion engines will undoubtedly be the prime movers in ground transportation for many years. The major problems in practice are fuel efficiency and the emission of pollutants: all of the papers in Part 2 address these two problems. The third part of the book deals with quite general laser diagnostics and modelling aspects, including computer simulations which hold out the promise of a long and important future.

The period 1986 to 1996 has seen an increase in the volume of research on, and knowledge of, lactic acid bacteria, organisms of prime importance for the production of dairy products and the fermentation of various vegetables. This text documents these recent developments with respect to genetics, metabolism and application of lactic acid bacteria for industrial and potential medical applications. It is aimed at all researchers with an interest in the fundamental biology of Gram-positive bacteria, in particular in lactic acid bacteria and their applications, not only as a source of reference but also as a source of information for further development and exploration of this field.

While the long-term storage of high-level wastes is just starting in some countries, low and medium-level wastes have been stored for several decades. Further, interim storage of spent fuel has been extended at many locations far beyond the intended time span. One of the priorities of this book is a discussion of the deleterious effects observed under these storage conditions, or under simulated storage condition tests. One chronic problem is the possibility that microbially-influenced corrosion could be occurring in the wet storage of spent fuel, thereby initiating or accelerating corrosion. Another problem is the presence of biofilms which may be breaking down the structure of waste forms, thereby jeopardizing their integrity. The book is organized around four topics: policy matters, fundamental technical issues, microbial processes in the interim storage of spent nuclear fuel, and repository storage of spent fuel. Some of the data presented indicates that previous engineering conditions are changing or deteriorating at a different rate (faster or slower) than predicted.Fundamental issues include microbial biofilm development on matrices, microbial influenced corrosion, and bioaccumulation of radionuclides.

IAU Colloquium 165, Dynamics and Astrometry of Natural and Artificial Celestial Bodies, was held in Poznan, Poland, in July 1996, bringing together over 200 scientists from 27 countries who discussed their work in 179 oral and poster presentations. The present volume contains 83 of the papers presented at the meeting. The meeting brought together specialists from diverse fields who focused on the very close collaboration between dynamics and astrometry, where one discipline contributes to the progress of the other. The oral sessions were organized into general categories pertaining to: solar system dynamics; new observational techniques, catalogues, and astrometry; dynamics and observational problems of artificial satellites and space debris; rotation of solar system objects; reference systems and astronomical standards; new mathematical techniques; and three all-day poster sessions. This volume is divided into seven parts, comprising 83 contributions and a list of participants.

This text is a debate over the origins of the "New Theory of Reference." Quentin Smith and Scott Soames, the original participants in the debate, elaborate their positions on who was responsible for the ideas that Saul Kripke presented in his "Naming and Necessity". They are joined by John Burgess, who weighs in on the side of Soames, while Smith adds a further dimension in discussing the contributions of philosophers such as Follesdal, Geach, Hintikka, and Plantinga. Also included are lengthy excerpts from Follesdal's 1961 Harvard dissertation and a careful examination by Sten Lindstrom of the respective contributions of Kripke and Stig Kanger to the development of modal semantics.

This text is a debate over the origins of the "New Theory of Reference." Quentin Smith and Scott Soames, the original participants in the debate, elaborate their positions on who was responsible for the ideas that Saul Kripke presented in his "Naming and Necessity". They are joined by John Burgess, who takes the side of Soames, while Smith adds a further dimension in discussing the contributions of philosophers such as Follesdal, Geach, Hintikka, and Plantinga. Also included are lengthy excerpts from Follesdal's 1961 Harvard dissertation and a careful examination by Sten Lindstrom of the respective contributions of Kripke and Stig Kanger to the development of modal semantics.

The protection of the environment is one of the most important problems facing us today. Reliable and robust strategies for keeping pollution caused by harmful chemicals under safe levels have to be developed and used routinely. Large mathematical models, incorporating all important physical and chemical processes, can solve this task, but the computational burden is huge. The papers presented here describe some of the difficult problems that have to be solved during the development of large scale air pollution models, and different ways to solve them. The work involves combined research by specialists in the fields of environmental modelling, numerical analysis and scientific computing. Further, if models are to run in real time (which may be vital in the case of accidental hazardous releases), then new and efficient methods that harness the potential power of parallel supercomputers must be developed, so that actual computing speed starts to approach the maximum available performance. The articles should be understandable by specialists in the field of air pollution modelling, as well as specialists in the many other related areas.