Nato Conference Series – serie

The planning for the conference held at Erice, Sicily, in November 1977, began with discussions among oceanographers from several countries on the need to consider the special problems and the recent results in the study of plankton "patchiness.

Fjords are deep, glacia11y carved estuaries that are pecu1iar to certain coast1ines, and have severa1 characteristics that dist- inguish them from sha110wer embayments. At higher latitudes they indent the western coast1ines of Scandinavia, North and South America, and New Zea1and. They are a1so a common feature of much of the arctic coast1ine. The papers contained in this vo1ume were presented at a workshop funded by the NATO Advanced Studies Institute in Victoria, British Co1umbia. It may seem curious to the reader that this specia1 c1ass of estuaries shou1d have attracted an international gathering of oceanographers from severa1 different discip1ines. The reas on for this interest stems from both practica1 and scientific considerations. On the one hand, fjords are a feature common to the coast1ines of severa1 countries that depend heavi1y on the oceans for communication, fisheries and other resources. The impact of man's activities on these coasts has created a demand for new know1edge of the physica1, bio10gica1 and chemica1 aspects of fjords.Sometimes man's inf1uence on the ocean is intentiona1 as, for examp1e, in the artificia1 contro1 of ice cover; often it is the more insidious bui1d-up of toxic wastes that is of concern. These prob1ems are particu1ar1y acute where the conf1icting demands of fisheries, industria1 deve10pment and re creation meet in a sing1e fjord; and indeed, this is a common occurence a10ng severa1 of the fjords in Scandinavia and Canada.

Against the background of NATO's Istanbul conference of 1971 (Cronbach and Drenth, 1972), the Kingston conference shows that great progress has been made by the community of cross-cultural psychologists. The progress is as much in the psychology of the investigators as in the investigations being reported. In 1971 the investigators were mostly strangers to each other. Behind their reports lay radically different field experiences, disparate research traditions, and mutually contradictory social ideals. Istanbul was not a Tower of Babel, but participants did speak past each other. Now a community exists, thanks to the meetings of NATO and the International Association for Cross-Cultural Psychology, to flourishing journals, and the Triandis et a1. (1980) Handbook. The members tend to know each other, can anticipate how their formu­ lations will fallon the ears of others, and accept superficially divergent approaches as making up a collective enterprise. Ten years ago there was open conflict between those who con­ fronted exotic peoples with traditional tests and applied tradi­ tional interpretations to the responses, and the relativists who insisted that tasks, test taking, and interpretation cannot be "standardized" in the ways that matter. Today's investigators are conscious of the need to revalidate tasks carried into alien settings; they often prefer to redesign the mode of presentation and to attune the subject to test taking. They face the diffi­ culties squarely and recognize that even the best means of coping are only partially successful.

During the past ten years, evidence has developed to indicate that seawater convects through oceanic crust driven by heat derived from creation of lithosphere at the Earth-encircling oceanic ridge-rift system of seafloor spreading centers. This has stimulated multiple lines of research with profound implications for the earth and life sciences. The lines of research comprise the role of hydrothermal convection at seafloor spreading centers in the Earth's thermal regime by cooling of newly formed litho­ sphere (oceanic crust and upper mantle); in global geochemical cycles and mass balances of certain elements by chemical exchange between circulating seawater and basaltic rocks of oceanic crust; in the concentration of metallic mineral deposits by ore-forming processes; and in adaptation of biological communities based on a previously unrecognized form of chemosynthesis. The first work­ shop devoted to interdisciplinary consideration of this field was organized by a committee consisting of the co-editors of this volume under the auspices of a NATO Advanced Research Institute (ARI) held 5-8 April 1982 at the Department of Earth Sciences of Cambridge University in England. This volume is a product of that workshop. The papers were written by members of a pioneering research community of marine geologists, geophysicists, geochemists and biologists whose work is at the stage of initial description and interpretation of hydrothermal and associated phenomena at seafloor spreading centers.

The mineral resources of the industrialized countries, especially the member nations of the North Atlantic Treaty Organiza­ tion, are being depleted at such a rate that more and more of these count ries are beginning to depend on ore imported from other coun­ tries. To sustain the economic and strategie well-being of these member countries, it becomes imperative that a program of developing and exploiting other non-conventional mineral resources and a con­ servation program where metal values from waste dumps and scrap metals and alloys are recycled must be initiated and implemented. In order to meet this challenge, new processes and technology must be available for consideration in the design and operation of the new plants. One of the possible routes of extracting the metals from their ores, especially for multimetal complex ores and very low grade ores, is by hydrometallurgical processing. The hydrometallurgical route of metal recovery where dissolution (leaching), separation and concentration (ion exchange, solvent extraction, and membrane separation) and reduction to metal (cementation, precipitation by gaseous reduction, and electrolysis) is carried out at near ambient temperature is becoming more competi­ tive with the conventional high temperature processes used in the smelting of metals from high grade and beneficiated ores.

This book contains the papers presented at a NATO Advanced Research Institute on "Mediterranean Marine Ecosystems", held at Heraklion-Crete, Greece, from September 23-27, 1983. A workshop rather than a conference, it was sponsored by the Eco-Sciences Special Programme Panel, in cooperation with the Marine Science Panel. The third of its kind, it was scheduled in the framework of a project on a multidisciplinary integrated approach to the study of the Mediterranean. This Sea and the surrounding land was not only the cradle of many civilizations but is, up to the present time, one of the major world areas of marine traffic, communication and exchanges, fisheries and aquacultures, inshore human activities and ••• pollu­ tion. To a certain degree it constitutes a gigantic natural labo­ ratory, where the fate of threatened aquatic and terrestrial eco­ systems including the human one, is tested. The Mediterranean Sea, with its geological history and present­ day geographic, hydrological and climatic conditions is believed to form an ecological entity. Important exchanges and mutual influences take place with the surrounding land area and the water masses, naturally (Atlantic, Black Sea) or artificially (Red Sea), connected to the Mediterranean. Therefore, a better and in-depth knowledge of the various ecosystems, benthic, planktonic and nektonic, neritic or pelagic, in the Western or the Eastern Basin seems to be a pre­ requisite to any action in preserving, upgrading and managing the natural resources of the area.

This book contains the papers presented at a Nato Advanced Re- search Workshop entitled "DENITRIFICATION IN THE N-CYCLE," held in Braunschweig (W-Germany) from 24 to 27 Mai 1983. All expenses were provided by the North Atlantic Treaty Organization. The scientific programme was in the first instance planned by some members of the Eco-Science Panel under the stimulating organization of Dr. Oscar Ravera and the final programme was prepared in co-operation between Ravera and myself. However, even during the meeting important con- tributions were added. The meeting was hosted by the Microbiologi- cal Dept. of F.A.L., which also took care of the organizatory as- pects. Nitrate is constantly lost from both terrestial and aquatic ecosystems, causing rnixed feelings between ecologists and agricul- turists. While bacteriologically very rnuch is known, the ecology of the processes is still poorly understood, nor can it be evaluated what it rneans as an econornic loss for farrners and world food produc- tion.Therefore this NATO Advanced Workshop was established to per- mit a lirnited nurnber of scientists active in this field to corne to- gether for a short while to address the following objectives: 1) To exchange ideas between scientists (bacteriologists and ecologists) and agronornists. 2) To assess the state of the art. 3) To discuss the difficulties of experimentation in the field. 4) To define future research. In order to accornplish these objectives, the workshopwas organ- ized in three parts with the following thernes: 1) Bacteriological aspects of dentrification.

During its existence the Ecosciences Panel of the North Atlantic Treaty Organisation was constantly concerned with (i) the communic­ ation gap between the generators of ecological/environmental infor­ mation and those who use it and (ii) the narrow interpretation of 'environmental' which too frequently was taken as being synonymous with pollution. Because of this concern, and because the panel recognised that land-use is perhaps the overriding facet of environmental policy it was decided to arrange the Seminar recorded in this volume :- Land and its Uses : Actual and Potential An Environmental Appraisal The development of this Seminar was chaired by Professor F. T. Last who was enthusiastically supported by B. G. Bell (U.K.), Drs S. Bie (Norway), 0. W. Heal (U.K.), R. Herrmann (Federal Republic of Germany), M.C.B.Hotz (formerly of NATO, Belgium, but now in Canada), L. Munn (Canada) and N. Yassoglou (Greece). Together, they decided that the participants should include (i) planners/decision­ makers and (ii) scientists generating ecological/environmental infor­ mation, in the hope that they would gain a better understanding of each others problems and attitudes and as a result identify how information can be prepared in a more usable form.

Seafloor investigation has long been a feature of not only seismology but also of acoustics. Indeed it was acoustics that produced depth sounders, giving us the first capability of producing both global and local maps of the seafloor. Subsequently, better instrumentation and techniques led to a clearer, more quantitative picture of the seabed itself, which stimulated new hypotheses such as seafloor spreading through the availability of more reliable data on sediment thickness over ocean basins and other bottom features. Geologists and geophysicists have used both acoustic and seismic methods to study the seabed by considering the propagation of signals arising from both natural seismic events and man-made impulsive sources. Although significant advances have been made in instrumentation, such as long towed geophysical arrays, ai r guns and ocean bot tom seismometers, the pic ture of the seafloor is still far from complete. Underwater acoustics concerns itself today with the phenomena of propagation and noise at frequencies and ranges that require an understanding of acoustic interaction at both of its boundaries, the sea surface and seafloor, over depths ranging from tens to thousands of meters. Much of the earlier higher frequency (>1 kHz) work included the characterization of the seafloor in regimes of reflection coefficients which were empirically derived from surveys. The results of these studies met with only limited success, confined as they were to those areas where survey data existed and lacking a physical understanding of the processes of reflection and scattering.

The chapters and reports in this publication have been selected from presentations at a Symposium on "Aging and Technological Advances" held in August, 1983 at the Ethel Percy Andrus Gerontology Center of the University of Southern California. The Symposium was made possible by a grant from the NATO Special Programme Panel on Human Factors, and the support of this program is gratefully acknowledged. Members of the Symposium Advisory Board were James E. Birren, Judy Livingston, Erhard Olbrich, Victor Regnier, Pauline Robinson, Thomas Singleton, Arnold Small, Harvey Sterns, and Alvar Svanborg. Professor Lambros Houssiadas also provided invaluable encouragement. Appreciation is also extended to the Andrew Norman Institute for Advanced Study in Gerontology and Geriatrics for support of planning activities leading up to the Symposium and for support of events surrounding the Symposium itself. A generous gift from The UPS Foundation to the Ethel Percy Andrus Gerontology Center made possible the compilation, editing and preparation of this manuscript and helped to support Symposium ac ti vi ties. We thank David Bergstone and Mary Margaret Ragan who together carefully and skillfully organized and carried out the typing of the manuscript.

The Advanced Research Institute on "Health Services Systems" was held under the auspices of the NATO Special Programme Panel on Systems Science as a part of the NATO Science Committee's continuous effort to promote the advancement of science through international cooperation. A special word is said in this respect supra by Pro­ fessor Checkland, Chairman of the Systems Science Panel. The Advanced Research Institute (ARI) was organized for the purpose of bringing together senior scientists to seek a consensus on the assessment of the present state of knowledge on the specific topic of "health services systems" and to present views and recom­ mendations for future health services research directions, which should be of value to both the scientific community and the people in charge of reorienting health services. The conference was structured so as to permit the assembly of a variety of complementary viewpoints through intensive group discussions to be the basis of this final report. Invitees were selected from allover Europe and North America, including observers from the major international organizations involved in health ser­ vices research, to provide the experience and expertise necessary to make the issue of "health services systems" val id and significant.

The concept of role transition refers to a wide range of experiences found in life: job change, unemployment, divorce, entering or leaving prison, retirement, immi­ gration, "Gastarbeiten," becoming a parent, and so on. Such transitions often produce strain and hence a variety of problems for the transiting individual, occu­ pants of complementary social positions, and other members of one's social group and community. In spite of the diversity of role transitions that occur, however, it is important also to realize that many basic psychological processes can be discerned in ostensibly different instances. Research on role transitions has been dispersed across many different subdisci­ of the social sciences; the problem can be investigated from several points of plines view and levels of analysis. As modern societies become ever more complex, role transitions can be expected to increase in number and diversity, with a concomitant increase in detrimental consequences for the individual and society. Hence, for rea­ sons of both theory and practice, improved conceptual models and new empirical data are needed. The chapters in this book are the outcome of a N.A.T.O. symposium convened for the purpose of discussing aspects of role transitions from international and inter­ disciplinary perspectives. The meeting was designed to be a working conference to facilitate as much intellectual exchange and debate among participants as possible.

The last major synthesis of our knowledge of fish migration and the underlying transport and guidance phenomena, both physical and biological, was "Fish Migration" published 16 years ago by F.R. Harden Jones (1968). That synthesis was based largely upon what could be gleaned by classical fishery-biology techni.ques, such as tagging and recapture studies, commercial fishing statistics, and netting and trapping studies. Despite the fact that Harden Jones also provided, with a good deal of thought and speculation, a theoretical basis for studying the various aspects of fish migration and migratory orientation, progress in this field has been, with a few excepti.ons, piecemeal and more disjointed than might have been expected. Thus we welcomed the approach from the NATO Marine Sciences Programme Panel and the encouragement from F.R. Harden Jones to develop a proprosal for, and ultimately to organize, a NATO Advanced Research Institute (ARI) on mechanisms of fish migration. Substantial progress had been made with descriptive, analytical and predictive approaches to fish migration since the appearance of "Fish ~ligration." Both because of the progress and the often conflicting results of research, we felt that the time was again right and the effort justified to synthesize and to critically assess our knowledge. Our ultimate aim was to identify the gains and shortcomings and to develop testable hypotheses for the next decade or two.

A primary aim of the NATO Science Committee since its estab­ lishment in 1958 has been to· further international scientific co­ operation among scientists from the member countries of the Alliance. Almost all fields of basic science have received sub­ stantial support for the purposes of enhancing exchange of inform­ ation, providing opportunities for advanced instruction and collaborative research. Up to 1977, more than 10,000 fellowships have been awarded to allow scientists to complete their scientific education in another country and more than 1,500 joint research projects involving scientists in at least two different countries per project have been financed by the Committee. In addition, more than 800 advanced study institutes have been held under NATO auspices which have allowed more than sixty thousand scientists to get together to hear leading scientists lecture on advanced research topics on the frontier of research of many disciplines and to discuss the most recent results of their research activi­ ties. The Science Committee also identifies specific areas as deserving special encouragement or preferential support for limited periods. A variety of mechanisms - research grants, study visits, conferences, etc. - is utilized to stimulate greater international activity. This effort is embodied in several individual programmes, each guided by a special programme panel of internationally eminent experts. Air-sea interaction is one of these programmes.

This book contains the fifteen invited papers delivered at the NATO International Conference on Experimental and Behavioral Appro­ aches to Alcoholism, held August 28 through September 1, 1977, at the Solstrand Fjord Hotel, Os, Norway. The editors of the book were Co-Directors of that conference. As well, 65 other scientists from 12 countries in the free world presented scientific papers on ex­ perimental and behavioral topics of relevance to alcoholism at the meeting. A most receptive audience of almost 200 persons also par­ ticipated actively in the discussions which followed every invited and contributed paper. The beauty of Norway, the hospitality of the proprietors of the Sol strand Fjord Hotel, the aura of Grieg and Troldhaugen, the en­ thusiasm of the speakers and participants - all combined to make the conference most memorable for those who attended it. Many persons and institutions deserve special thanks for their part in the success of the conference. Among these persons are Dr.

This volume contains papers presented at a NATO Advanced Research Institute, sponsored by their Eco-Sciences Panel, on "The effects of acid precipitation on vegetation and soils," held at Toronto, Canada from May 22-26, 1978. The organizing expenses and greater part of the expenses of the speakers and chair~en were provided by N.A.T.O. The scientific programme was planned by T. C. Hutchinson together with an international planning committee of G. Abrahamsen (Norway), G. Likens (U.S.A.), F.E. Last (U.K.), C.O. Tamm (Sweden) and B. Ulrich (W. Germany). Many of the dimensions of the 'acid rain' problem are common to countries of northern Europe and North America. The developing awareness over the past ten years of the international nature of the acid rain phenomenon has lead to studies documenting damaging effects on susceptible freshwater bodies. Large areas of the Canadian Pre-Cambrian Shield, with its extension into the United States, and the granitic areas of southern Norwayand Sweden contain lakes which are in the process of acidification. The biological resources of these affected areas are of considerable national concern. However, while clearly damaging effects of acidification on freshwater systems have been well documented, the impact of acid precipitation on terrestrial systems has not been so well understood.

Fjords are deep, glacia11y carved estuaries that are pecu1iar to certain coast1ines, and have severa1 characteristics that dist- inguish them from sha110wer embayments. At higher latitudes they indent the western coast1ines of Scandinavia, North and South America, and New Zea1and. They are a1so a common feature of much of the arctic coast1ine. The papers contained in this vo1ume were presented at a workshop funded by the NATO Advanced Studies Institute in Victoria, British Co1umbia. It may seem curious to the reader that this specia1 c1ass of estuaries shou1d have attracted an international gathering of oceanographers from severa1 different discip1ines. The reas on for this interest stems from both practica1 and scientific considerations. On the one hand, fjords are a feature common to the coast1ines of severa1 countries that depend heavi1y on the oceans for communication, fisheries and other resources. The impact of man's activities on these coasts has created a demand for new know1edge of the physica1, bio10gica1 and chemica1 aspects of fjords.Sometimes man's inf1uence on the ocean is intentiona1 as, for examp1e, in the artificia1 contro1 of ice cover; often it is the more insidious bui1d-up of toxic wastes that is of concern. These prob1ems are particu1ar1y acute where the conf1icting demands of fisheries, industria1 deve10pment and re creation meet in a sing1e fjord; and indeed, this is a common occurence a10ng severa1 of the fjords in Scandinavia and Canada.

Arnold Hansen Director Marine Technology Centre Trondheim Norway Norwegian fisheries are presently facing serious problems, but also some promising challenges. Most important is the fact that nearly all the major fish­ stocks have been over-exploited, either by an overall too large fishing effort or a too large effort on wrong year-classes, resulting in stock-sizes reduced well below an economically optimum level or even nearly depleted. The atlanto-scandic herrings, for instance, has been below an exploitable level for several years. The recommended total allowable catch of Norwegian-Arctic cod for 1980 is 390,000 tons compared to more than 800,000 tons a few years ago. The Norwegian industrial fisheries are today mainly based on capelin. The Soviet Union has successfully claimed an increased share of this resource, resulting in an accordingly reduced catch quota for the Norwegian purse seining fleet. As a result of this resource situation the excess catching and processing capacity is great. Maintaining this excess capacity means high production costs. Both short term and long term planning for a better capacity adoption to the resources are necessary, as are means of policy to obtain this goal. (In other words fishery management is a neces­ sity. ) Generally speaking the fishing industry is energy intensive. Fuel prices have increased dramatically the last year. Further increases may be expected as we gradually change from the present politically based situation of a non-realized excess crude oil production capacity into a real shortage of oil fuels.

This volume contains the proceedings of a conference held in Freiburg, West Germany, September 22-25, 1980, entitled "Manned Systems Design, New Methods and Equipment". The conference was sponsored by the Special Programme Panel on Human Factors of the Scientific Affairs Division of NATO, and supported by Panel VIII, AC/243, on "Human and Biomedical Sciences". Their sponsorship and support are gratefully acknowledged. The contributions in the book are grouped according to the main themes of the conference with special emphasis on analytical approaches, measurement of performance, and simulator design and evaluat ion. The design of manned systems covers many and highly diversified areas. Therefore, a conference under the general title of "Manned Systems Design" is rather ambitious in itself. However, scientists and engineers engaged in the design of manned systems very often are confronted with problems that can be solved only by having several disciplines working together. So it was felt that knowledge about newly developed methods and equipment, applicable in the design process, is of common and increasing interest for all those who are engaged in the design of manned systems, from the earliest con­ ceptual design phases until operation under real circumstances. This seems to be particularly true in view of restricted resources of manpower and energy.

Svend Saxov* and J.K. Nieuwenhuis** *Laboratory of Geophysics, Aarhus University Finlandsgade 6, DK-8200 Aarhus N, Denmark **Ministry of Transport and Public Works Rijkswaterstaat, Deltadienst Van Alkemadelaan 400, 2597 AT the Hague The Netherlands The NATO Science Committee Special Programme Panel on Marine Sciences decided in September 1979 that a work- ing group should prepare a document dealing with the prob- lems of marine slides. The working group submitted to the Panel a proposal for the arrangement of an interdisciplinary workshop on Marine Slides and other Mass Movements, and the Panel decided to fund such a workshop. Mass movement of soils and rocks on subaerial slopes is a subject which has been intensely studied over the past fifty years, and its literature is becoming extens- ive. The submarine phenomenon, although similar in its pbysical basis, is much less studied, but has become an important subject (particularly during the past decade) because of the increase of man's use of the coastal en- vironment and the intensified exploration for oil and minerals on the continental margins and ocean basins.

This volume is the proceedings of the Symposium entitled, "Work, Organizations and Technological Change" which was held in Garmisch-Partenkirchen, West Germany, 14-19 June 1981. The meeting was sponsored by the Special Panel on Systems Sciences of the NATO Scientific Affairs Division. In proposing this meeting the Symposium Directors built upon several preceding NATO conferences in the general area of personnel systems, manpower modelling, and organization. The most recent NATO Conference, entitled "Manpower Planning and Organization Design," was held in Stresa, Italy in 1977. That meeting was organized to foster research on the interrelationships between programmatic approaches to personnel planning within organizations and behavioral science approachs to organization design. From that context of corporate planning the total internal organizational perspective was the MACRO view, and the selection, assignment, care and feeding of the people was the MICRO view. Conceptually, this meant that an integrated approach was needed if all the dimensions of such problems within private and public organizations were to corne out correctly.

From August 4 to 8, 1980, the Science Committee of the North Atlantic Treaty Organization (NATO) sponsored the symposium, "Women and the World of Work," which was held at the Hotel Sintra Estoril in the coastal area south of Lisbon, Portugal. This symposium hatl been "in progress" since 1977 when the idea to prepare a proposal for a NATO­ sponsored symposium on the topic of women and the military was first suggested by Dr. Walter Wilkins, then Scientific Director of the Naval Health Research Center, San Diego, California. At that time and during the previous 5 years, increasing numbers of women were being recruited into military service not only in the United States but also in several NATO-allied countries. Few research projects on the utilization of women in the military had been reported in the scientific literature with the exception of work conducted at the University of Chicago and Naval Health Research Center. Several investigators, however, were identified who had recently initiated research in this area-and who expressed interest in participating in the proposed symposium. A few months after submitting the proposal, Dr. B. A. Bayraktar, Director of the Scientific Affairs Division responded that the members of the Science Committee recommended the deletion of those segments of the tentative program which pertained to women and the military. The reason given for this suggested change was that the topic chosen was similar to the theme of other recent international conferences.

A group of geoscientists from a number of NATO countries met under NATO sponsorship in Copenhagen on February 27 and 28, 1978, and formulated a proposal entitled "EVOLUTION OF THE GREENLAND­ ICELAND-FAEROE-SCOTLAND RIDGE, A KEY AREA IN MARINE GEOSCIENCE". This part of the North Atlantic Ocean is of particular interest because of its anomalously shallow bathymetry which has profoundly influenced many aspects of the evolution of the North Atlantic. The proposed investigations therefore aim to study the deep crustal structure including relationship of continental and oceanic crust, history of subsidence of the ridge including its past role as a land bridge, age of the oceanic basement along it and its history of formation, and the influence of the ridge on Tertiary and Quaternary depositional palaeoenvironments. In furtherance of this proposal, it is intended to carry out a series of seismic and drilling operations on the Ridge during the coming years. These major marine investigations will be mainly funded from national sources. An important preliminary stage to the project is the collec­ tion and synthesis of available data. NATO has already approved a small budget for this purpose which has enabled a geoscientist to work partly at the Department of Geological Sciences of Durham University, UK, and partly at Lamont-Doherty Geological Observatory of Columbia University, Palisades, USA, for about six months to compile the data. The most important map showing magnetic anomalies and lineations in the area, is included in a pocket at the back of this volume.

It is now more than 100 years since certain detrimental effects on the ductility of iron were first associated with the presence of hydrogen. Not only is hydrogen embrittlement still a major industri­ al problem, but it is safe to say that in a mechanistic sense we still do not know what hydrogen (but not nitrogen or oxygen, for example) does on an atomic scale to induce this degradation. The same applies to other examples of environmentally-induced fracture: what is it about the ubiquitous chloride ion that induces premature catastrophic fracture (stress corrosion cracking) of ordinarily ductile austenitic stainless steels? Why, moreover, are halide ions troublesome but the nitrate or sulfate anions not deleterious to such stainless steels? Likewise, why are some solid metals embrit­ tled catastrophically by same liquid metals (liquid metal embrit­ tlement) - copper and aluminum, for example, are embrittled by liquid mercury. In short, despite all that we may know about the materials science and mechanics of fracture on a macroscopic scale, we know little about the atomistics of fracture in the absence of environmental interactions and even less when embrittlement phe­ nomena such as those described above are involved. On the other hand, it is interesting to note that physical chemists and surface chemists also have interests in the same kinds of interactions that occur on an atomic scale when metals such as nickel or platinum are used, for example, as catalysts for chemical reactions.

Behavioral Treatment of Disease: A NATO Symposium on Behavioral Medicine was held on June 30th through July 3rd, 1981 at Porto Carras, Neo Marmaras, Greece. It was a multi­ disciplinary meeting which provided an opportunity for North American and European scientists from ten different NATO member countries to share the emerging principles and technology of behavioral treatment of disease. In addition, it served as a forum whereby continued high level research in the area was stimulated. Financial support for the symposium was initially provided by the Scientific Affairs Division or the North Atlantic Treaty Organization as part of their continuing seri.es of scientific symposia. Funds made available by a grant from the United States Office of Naval Reseach permitted widespread inter­ national participation in the symposium. We would like to thank each of these organizations for their support in making the symposium possible. In particular, we would like to thank Dr. B. A. Bayraktar of the Scientific Affairs Division of NATO and Dr. Donald Woodward of the U.S. Office of Naval Research. Though both of these men were unable to attend the meeting personally, they provided invaluable assistance in its planning.

In September 1980, the Special Programme Panel on Systems Sciences of the North Atlantic Treaty Organization (NATO) sponsored an Advanced Research Institute (ARI) on "Systems Analysis in Urban Policy-Making and Planning" which was held at New College, Univer­ sity of Oxford, from 21st to 27th September. This week-long meeting brought together 35 invited delegates from most countries of the NATO Alliance to discuss the impact which syst~ms analysis has had and is likely to have on urban affairs. The manuscript was submitted to the publisher in June of 1982. Although the goal of the ARI was to assess the impact of urban systems analysis as seen through the eyes of those closely involved in such work, the meeting also addressed opportunities for future research and development, and therefore in this book we have attempted to synthesize discussions at the meeting with this in mind. But before we describe the structure of this book, it is worth recounting in a little more detail the intentions and organi­ zation of the meeting, for this has had an important effect on the type of papers produced here, the way they have been written, and the issues they address.

These two volumes contain the papers presented at a North Atlantic Treaty Organization (NATO) Advanced Study Institute held on September 22-28, 1979 in Monte Carlo, Monaco. The conference was entitled "In Vitro Toxicity Testing of Environmental Agents: Current and Future Possibilities." This international conference presented an opportunity for the participants to exchange informa­ tion and ideas on the current approaches (both scientific and po­ litical) for toxic assessment of environmental agents. The poten­ tial health effects of these compounds as well as future needs in the environmental research field were discussed. The scientific content of the conference seminars included an overview of the various cellular, subcellular, organ, animal, and genetic systems which have been used to assess the health effects of environmental agents. The scientific principles behind short­ term assays and an evaluation of their applicability to health effects monitoring and analysis were investigated. Included among major topics were: (1) the biochemistry and pharmacology of selected environmental agents; (2) molecular mechanisms of car­ cinogenesis, mutagenesis, and transformation; (3) bacterial muta­ genesis and toxicity; (4) mammalian cell mutagenesis, toxicity, and transformation; (5) in vitro carcinogens and mutagens; (6) teratogenic and other developmental toxic effects; and (7) the development of short-term neuro-behavioral toxicity assays.