人体防电磁辐照的安全限值

电磁场对人体的影响是何等的复杂，以致不少专家或学者将不妥的量值作为标准。作者在大量调测，亲身体验和界面研究之后，为了去伪存真，还科技之本来，推出了符合系统工程之要求的防电磁辐照安全限值。     

INTERDISCIPLINARY MODELING IN THE ANALYSIS OF THE SALINITY PROBLEMS OF THE SAFFORD VALLEY1

ABSTRACT: A groundwater quality change of +0.13 millimhos electrical conductivity was documented between 1940 and 1 972 in the Safford Valley. The change is attributable to four principal mechanisms: pumping-encouraged saline artesian aquifer leakage, natural recharge of the water table aquifer by saline waters, leaching of agricultural waters into the aquifer and the lateral flow of groundwater through saline lacustrine beds. A hydrologic study of the area has shown the first of these mechanisms to be predominant. Salinity modeling has shown three regions of salinity change, and salinity increase projections for each are determined. An economic analysis and an economic model are then combined with the physical model, yielding information as to when certain economic conditions are reached with respect to the salinity increase. This combined model shows that, based on projected salinity trends, cotton, the principal agricultural crop of the valley, will remain economical to cultivate for a significant time beyond the model's limit of prediction. Alfalfa, on the other hand, should go out of production in large areas of the valley by 1990, and not be under economical cultivation by 2040. A sociologic model, based on the cluster analysis of questionnaire data, shows an awareness of the salinity problems of the area but little concern over them. Interdisciplinary model based salinity control regulations are made.     

THE IMPACT OF URBANIZATION ON THE DISTRIBUTION OF HEAVY METALS IN BOTTOM SEDIMENTS OF THE SADDLE RIVER1

ABSTRACT: A three-year study has been conducted on a 4.6 mile stretch of the Saddle River near Lodi, New Jersey. The primary objectives of this investigation were (1) to provide baseline information on the concentration and distribution of heavy metals in bottom sediments of the Saddle River; (2) to qualitatively evaluate which parameters affect this distribution; and (3) to determine the effect of urbanization on the concentration and distribution of these materials. Significant enrichments of several heavy metals were observed in bottom sediments of the lower Saddle River near Lodi, New Jersey, as compared to the upper Saddle River. Attempts to correlate metal concentrations in bottom sediments with chemical-oxygen demand were not successful in demonstrating a relationship between these two factors. Metal concentrations were found to be strongly dependent upon particle size. In general, metal concentrations in bottom sediments increased with decreasing partical diameter. However, metals enrichment was observed to be considerably greater in the larger sediment fractions studied (>420μ) than the smaller sediment fractions as one proceeded downstream through the urban area. Since the larger sediment fractions are least effected by scour and transport they may best reflect the effect of urbanization on the distribution of heavy metals over an extended period of time at a given location.     

GEOGRAPHIC VARIATION OF THE STATISTICAL PARAMETERS OF HYDROMETEOROLOGICAL DATA OF THE UNITED STATES1

ABSTRACT: Having determined various statistical parameters for five mean monthly hydrometeorological time series of the United States, directional variation of the autocorrelation numbers, their spatial distribution over the United States and statistical significances are presented in this paper. Two conceptually different approaches (one using directional strips of large combined watersheds and the other with analysis of variances) are employed to explore the geographic variation of the statistical parameters (autocorrelations and explained variances) in question. Results adequately indicate the correspondence between these variations and the observed topographic, climatologic and hydrologic characteristics over the United States.     

THE IMPORTANCE OF PERCEPTIONS IN THE DETERMINATION OF INDIAN WATER RIGHTS1

ABSTRACT The American Indian occupies a unique place in the federal system of government There are indications that this relationship will continue and that Indian reservations are at the threshold of economic development. As this occurs, the nature and extent of Indian water rights becomes more important to Indian and non-Indian alike. The determination of these rights is a matter of more than judicial decisions. To a large degree the determination of these rights will rest in the non-judicial arena and will be influenced by the perceptions of those rights held by Indians and water allocation officials, both state and federal. If the perceptions of these political actors are not congruent, then political conflict will occur as the rights become more important. To depend solely upon the judicial system to resolve these conflicts entails risks and costs to both Indians and to allocating officials. Indians are taking seriously the federal policy of Indian self-determination, and water allocation officials run decided risks in failure to realize this. An alternative suggested is to include Indians as consulting parties when decisions are being made that affect Indian interests.     

PERCEIVED QUALITY OF CARE: THE INFLUENCE OF THE WAITING ROOM ENVIRONMENT

The current study investigated the effect of the physical environment of the waiting room on perceptions of the quality of care of the physician. One hundred forty-seven college students and 58 senior citizens viewed 35 slides of physicians' waiting rooms. Using a visual analog scale, participants rated the perceived quality of care and the environment of each waiting room. The primary hypothesis was that perceived quality of care would be greater for waiting rooms that were nicely furnished, well-lighted, contained artwork, and were warm in appearance versus waiting rooms that had outdated furnishings, were dark, contained no artwork or poor quality reproductions, and were cold in appearance. Factor analyses of the care and environment ratings produced factors consistent with the hypothesis. Additionally, waiting rooms judged to be those of female physicians were rated higher on both perceived quality of care and comfort in the environment.     

THE EVOLUTION OF TEXAS WATER LAW AND THE IMPACT OF ADJUDICATION1

Texas' surface water law began its evolution during the Hispanic period of occupance. Later, the English riparian doctrine was adopted, and finally, in the late 1800's, the prior appropriation doctrine was superimposed, resulting in an exceedingly complex dual system. Though the judiciary, legislature, and state water agencies have wrestled with the problem of coordinating these diverse water rights and more accurately delineating and measuring riparian rights and water use since early in this century, until recently all attempts were unsuccessful. The unknown riparian element, in particular, made coordinated and efficient management and administration of the state's surface water resources impossible. Finally, measurable progress toward solution of these problems began in 1967 with passage of the Water Rights Adjudication Act, aimed at identifying all unrecorded surface water rights claims and eventually merging all claims into the permit system. This paper examines the gradual evolution of Texas' curious blend of Hispanic-English riparian rights and later appropriate rights; discusses the resultant problems of water resource administration; and traces the progress of the ongoing water rights adjudication, a lengthy, expensive, and complex procedure, which should eventually make possible more efficient administration of all surface water rights.     

A HYDROCLIMATOLOGICAL ANALYSIS OF THE RED RWER OF THE NORTH SNOWMELT FLOOD CATASTROPHE OF 19971

ABSTRACT: The flood hydroclimatology of the Grand Forks flood of April 1997, the most costly flood on a per capita basis for a major metropolitan area in United States history, is analyzed in terms of the natural processes that control spring snowmelt flooding in the region. The geomorphological characteristics of the basin are reviewed, and an integrated assessment of the hydroclimatological conditions during the winter of 1996 to 1997 is presented to gain a real‐world understanding of the physical basis of this catastrophic flood event. The Grand Forks flood resulted from the principal flood‐producing factors occurring at either historic or extreme levels, or at levels conducive to severe flooding. Above normal fall precipitation increased the fall soil moisture storage and reduced the spring soil moisture storage potential. A concrete frost layer developed that effectively reduced the soil infiltration capacity to zero. Record snowfall totals and snow cover depths occurred across the basin because of the unusual persistence of a blocking high circulation pattern throughout the winter. A severe, late spring blizzard delayed the snowmelt season and replenished the snow cover to record levels for early April. This blizzard was followed by a sudden transition to an extreme late season thaw due to the abrupt breakdown of the blocking circulation pattern. The presence of river ice contributed to backwater effects and affected the timing of tributary inflows to the main stem of the Red River. Only the absence of spring rains prevented an even more catastrophic flood disaster from taking place. This paper contributes to our understanding of the flood hydroclimatology of catastrophic flood events in an unusual flood hazard region that possesses relatively flat terrain, a north‐flowing river, and an annual peak discharge time series dominated by spring snowmelt floods.     

THE OPTIMIZATION OF THE OPERATION OF A MULTI-PURPOSE WATER RESOURCE SYSTEM1

The objective of any water resource system is to transform the natural waters of a river basin into a form such that optimal use of these waters will result. Thus the water may be transformed into electrical energy, transferred in space for water supply and irrigation, transferred in time for flood control and maintenance of adequate streamflows, or simply retained for use as a means for achieving water-based recreation.     

THE EFFECTS OF RECENT CHANGES IN ATMOSPHERIC CIRCULATION ON THE HYDROLOGY OF THE KANKAKEE RIVER1

ABSTRACT: In North America the four successive winters from 1974-1975 through 1977–1978 were very different from each other in terms of atmospheric circulation and resulting surface weather conditions. The first year of the sequence there was a near normal circulation pattern. The following years were characterized by the gradual amplification of an upper atmosphere ridge over the West Coast coupled with an eastward displacement of a long-wave trough east of the Rocky Mountains. These changes in circulation brought below normal temperatures to the Midwest, below normal precipition and increasing snowfall which reached record levels in February 1978. These atmospheric changes brought about changes in the flow of the Kankakee River-Total runoff in the winter half-year dropped as precipitation and temperatures dropped; there was a marked retarding of winter runoff and the yield of the watershed increased.     

THE IMPORTANCE OF ACCURATE CURVE NUMBERS IN THE ESTIMATION OF STORM RUNOFF1

ABSTRACT: Storm runoff as calculated by the runoff curve number method is shown to be of varying sensitivity to both input rainfall and curve number. Using an assumed input error of 10%, a runoff error chart is given. Up to about 9 inches of rainfall, runoff is more sensitive to curve number than to rainfall. The importance of accurate curve number selection in this range is stressed.     

TWO DECADES OF MINERAL RESOURCES DEVELOPMENT: THE ROLE OF THE UNITED NATIONS

The Department of Technical Co-operation for Development of the United Nations Secretariat in New York, which now incorporates the Division of Natural Resources and Energy (formerly the Centre for Natural Resources, Energy and Transport) has, over the past 20 years, assisted the geology and mineral development programmes of most of the world's developing countries. Funding for this technical co-operation has been provided mainly by the United Nations Development Programme (UNDP) with roughly equivalent amounts by recipient governments, generally in the form of national facilities, staff and local operating costs. The total UNDP expenditures of some $170 million have supported more than 200 projects so far. At present, about 45 projects are operational with a total budget of about $55 million. The large-scale operational activities of the United Nations programme in the past have concentrated primarily on systematic mineral exploration combined with strengthening of national institutions, basic geological mapping and feasibility investigations. Associated with the United Nations programme are the projects of the United Nations Revolving Fund for Natural Resources Exploration, more recently established to provide an additional source of exploration financing in recognition of the needs of developing countries which are not being adequately met by their own resources and the limited resources available within the United Nations Development Programme. Le Département de la coopération technique pour le développement du Secrétariat des Nations Unies à New York dont fait maintenant partie la Division des ressources naturelles et de l'énergie (anciennement le Centre des ressources naturelles, de l'énergie et des transports) a apporté son assistance pendant ces vingt demières années aux programmes de mise en valeur de la géologie et des minéraux de la plupart des pays en développement du monde. Le financement de cette coopération technique a été essentiellement assuré par le Programme des Nations Unies pour le développement (PNUD) et les gouvernements receveurs qui ont fourni des sommes approximativement équivalentes, généralement sous forme d'installations, de personnel et de frais d'exploitation au niveau national. Le montant total des dépenses du PNUD, s'élevant à quelque $170 millions, a financé jusqu'à présent l'exécution de plus de 200 projets. Auparavant, les activités opérationnelles de grande échelle du programme des Nations Unies ont été dirigées principalement vers l'exploration systématique des minéraux conjointement avec le renforcement des institutions nationales, l'établissement de cartes géologiques de base et les enquêtes de faisabilité. Les projets du Fonds autorenouvelable des Nations Unies pour l'exploration des ressources naturelles, associés au programme des Nations Unies, ont été récemment établis afin de fournir une source supplémentaire de financement de l'exploration pour répondre aux besoins des pays en développement que leurs propres ressources de même que celles disponibles mais limitées du Programme de développement des Nations Unies n'arrivent pas à satisfaire de manière adéquate. El Departamento de Cooperación Técnica para el Desarrollo del Secretariado de las Naciones Unidas, que incorpora la División de Recursos Naturales y Energía (anteriormente Centro de Recursos Naturales, Energía y Transportes) ha, en los últimos 20 años, asistido a los programas de geología y desarrollo de minerales en la mayoría de los países en desarrollo. La financiación para esta cooperación técnica fue proveída principalmente por el Programa de las Naciones Unidas para el Desarrollo (PNUD) y por los Gobiernos, en especie, por un monto aproximadamente igual a la contribución del PNUD. La contribución total del PNUD de unos $170 millones ha sido aplicado a más de 200 proyectos hasta ahora. Acerca de 45 proyectos están en ejecución al presente por un monto aproximado de $55 millones. En el pasado los proyectos de gran escala del programa de actividades de las Naciones Unidas se han concertado principalmente en la exploración sistemática de minerales combinada con el reforzamiento de instituciones nacionales, geológico basico y estudios de factibilidad. Asociados al programa arriba mencionado se ejecutan los proyectos del Fondo Revolvente de las Naciones Unidas para la Exploración de Recursos Naturales, fondo recientemente establecido con el objeto de proveer financiación adicional a las actividades de exploración. La limitación de los recursos propios de los países en desarrollo y la del Programa de las Naciones Unidas para el Desarollo para hacer frente a las necesidades de dichos países han urgido la creación del Fondo.