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1.
Based on a study of Little Saigon, an ethnic enclave in Westminster, California, this paper examines the physical, social, symbolic and emotional significance of such places in the lives of immigrants. We focus on three specific aspects of the ethnic enclave: architectural elements, everyday social interaction within the enclave, and public ritual events. We highlight how the built architectural environment and the immigrants' social, commercial, and ritual activities interact to create and sustain a sense of place, foster community identity, and structure social relations. We conclude that ethnic enclaves constitute an important aspect of an immigrant's place identity enabling him/her to simultaneously remain connected to the places left behind and yet appropriating and forging significant new place ties.  相似文献   

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ABSTRACT: The impact of forests on water has- been a subject of argument for more than a century. It still is; and many studies conform that there is no single right answer in the debate. In the Lake States, clearcutting natural peatlands will not change annual stream-flow nor will it seriously impact water quality if logging is done on frozen soils. However, clearcutting will cause water tables to fluctuate more, ranging from 9 cm higher to 19 cm lower than in peatlands with mature forests. Clearcutting upland hardwoods or conifers will increase annual strearnflow by 9 to 20 cm (a 30- to 80-percent increase). Streamfiow returns to preharvest levels in 12 to 15 years. Annual peak flows are at least doubled and snowmelt flood-peak increases may persist for 15 years. Water quality is not widely impacted, but operating logging equipment in stream channels will cause channel clogging by filamentous algae and loss of fish habitat. Permanent changes from forest to agricultural and urban land use on two-thirds or more of a watershed will significantly increase the size of flood peaks in the 2- to 30-year return interval storm or snowmelt.  相似文献   

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ABSTRACT: Land development projects that are presumed to have regional impact according to the Florida Land and Water Management Act of 1972 are forced to minimize adverse environmental impact through a detailed procedure called Application for Development Approval (ADA). In Southeast Florida, as part of this review process, the water-supply and flooding conflicts must be resolved with the regional water management agency, Central and South Florida Flood Control District (FCD). This paper discusses the efforts to resolve these two conflicts for a large proposed residential development in Broward County, Florida. The project, as envisioned by Leadership Housing, Inc., places 25,000 dwelling units on the 3,960-acre site. The project is located in a flood prone area of the Hillsboro Canal Basin and is at the northwest edge of the Biscayne Aquifer. Significant land modification is required to flood-proof the project. The water-supply conflict was resolved only when the FCD was assured that the ultimate water demand for the project was balanced by the natural recharge to the site. Significant water-resources studies were required to produce these conflict resolutions.  相似文献   

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From a discussion of the main objectives of river basin planning, the author develops the elements needed to assure successful river basin planning at the multinational level. Functions of some existing international river basin commissions are described and a fourfold classification based on the degree of planning undertaken is proposed. The Canada—United States experience in river basin planning is placed in a historical framework and the political, legal and economic factors which influenced the operations of the Canada—US International Joint Commission are described. The central point about Canada—US experience appears to be that direct planning is less frequent than indirect “planning.” The two main functions of the Canada—US International Joint Commission are regulation on the one hand and dispute settlement on the other. Partant d'une discussion sur les principaux objectifs de la planification des bassins fluviaux, l'auteur analyse les éléments nécessaires à la planification efficace de ces bassins au niveau multinational. II décrit les fonctions de certaines commissions internationales de bassins fluviaux et propose une classification en quatre parties basée sur le degré de planification envisagé. L'auteur situe les travaux du Canada et des Etats-Unis en matière de planification de bassins fluviaux dans un contexte historique et analyse les facteurs politiques, juridiques et économiques qui influencent les activités de la Commission internationale mixte du Canada et des Etats-Unis. Le résultat principal des travaux de cette Commission semble être que la planification directe est plus rare que la planification indirecte. Les deux fonctions principales de la Commission sont la réglementation d'une part et le règlement de disputes de l'autre. Después de discutir los objetivos principales la Planificación de Cuencas Hidrográficas, el autor desarrolla los elementos necesarios para asegurar una planificación apropiada de cuencas a nivel multinacional. Se describen las funciones de algunas Comisiones de Cuencas Internacionales y se propone una clasificación basado en el grado de planificación emprendida. Se pone en un marco histórico la experiencia de Canadá y los Estados Unidos en materia de planficación de cuencas hydrográficas y se describen los factores politicos, legales y económicos que influenciaron las operaciones de la Comisión Conjunta Internacional Canadá-Estados Unidos. El punto central de la experiencia Canadá—Estados Unidos parece ser que la planificación directa es menos frecuente que la “planificación indirecta.” Las funciones principales de esta comisión son establecer regulaciones y dar solución a las disputas existentes.  相似文献   

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Although similar processes and functions have been proposed for privacy regulation and place attachment, little theoretical or empirical work encompasses both constructs. In the present study, a theoretical model relates privacy regulation to place attachment in the home. According to this model, the home setting may either facilitate or inhibit privacy regulation with family. When regulation is facilitated, family functioning and feelings of control should be enhanced, promoting attachments to the home.Questionnaire data from student family apartment residents supported this model. Residents who reported greater ease in regulating privacy with family also reported greater apartment attachment. Analyses suggested that this relationship was mediated by family functioning and feelings of control. Similar relationships were found for three different types of attachment.By bridging across concepts often treated separately, the model supported in this study suggests new directions for theoretical and empirical study, and new applications for housing policy and design.  相似文献   

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ABSTRACT: An automated extraction of channel network and sub-watershed characteristics from digital elevation models (DEM) is performed by model DEDNM. This model can process DEM data of limited vertical resolution representing low relief terrain. Such representations often include ill-defined drainage boundaries and indeterminate flow paths. The application watershed is an 84 km2 low relief watershed in southwestern Oklahoma. The standard for validation is the network and subwatershed parameters defined by the blue line method on USGS 7.5–minute topographic maps. Evaluation of the generated and validation networks by visual comparisons shows a high degree of correlation. Comparison of selected network parameters (channel length, slope, drainage density, etc.) and of drainage network composition (bifurcation, length, slope, and area ratios) shows that, on the average, the generated parameters are within 5 percent of those derived from the validation network. The largest discrepancies were found for the channel slope values. The results of this application demonstrate that DEDNM effectively addresses network definition problems often encountered in low relief terrain and that it can generate accurate network and subwatershed parameters under those conditions.  相似文献   

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ABSTRACT: The cries of pending water crises are usually cast in terms of water availability and/or water quality. Unfortunately, the real factors underlying a perceived crisis are often overlooked and the solutions prescribed are fax from optimal when measured in either economic or social terms. Today's technology outstrips its implementation, yesterday's solutions are imposed on a new breed of problems, and a static game is being played in a dynamic world. There is a need for the application of innovative and revolutionary tactics, for modernizing institutions, and for educating technologists and decision makers alike in the art of communicating their views and skills. This is the challenge. If it is met, some predicted crises will not materialize, and many others will be diminished in scale. An exciting opportunity exists to extend the boundaries of a new era in water management.  相似文献   

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: The effects of corn, soybean, and oat canopies on plant nutrient contents of throughfall precipitation (TFP) were studied to determine if canopies alter the meteoric precipitation (MP) composition. TFP samples collected at 5 cm from corn or soybean rows contained more NH4, NO3, soluble PO4, total PO4, and soluble K ions than samples collected at 25 and 45 cm distances from the row. Enrichment of MP by the canopies was least at the 45 cm distance. Oat canopies enriched MP more than soybean or corn canopies for most of the ions, probably due to the difference in season of growth. Thus, canopies of these crops alter the nutrient concentration of MP.  相似文献   

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While materials and energy are only two of the many factors necessary to support economic activity, it is frequently claimed that special relationships exist between these two resources. This article examines the evidence for and against the existence of correlations between the supply of energy and the availability of materials and how they relate to economic growth. Principal characteristics of past energy and materials use are examined in terms of national, industrial and materials consumption, and then the most significant factors determining past behaviour are examined in terms of the same sectoral breakdowns. Data included in the study are from the United States for the period from 1900 to the present and from 1960 to the present for a number of other industrialized countries. The article concludes that the energy-materials correlation is close only at the industrial level, and that this relationship could be of use in predicting future consumption trends. Quoique les matières premières et l'énergie représentent seulement deux des nombreux facteurs nécessaires à l'activité économique, l'on dit souvent qu'il existe une relation particulière entre les deux. Cet article examine les raisons pour et contre l'existence des relations entre la fourniture d'énergie et la disponibilité des matières premières ainsi que la façon dont elles se relient à la croissance économique. Les caractéristiques principales de l'utilisation de l'énergie et des matières premières sont étudiées en fonction de la consommation nationale, industrielle et des matières premières. Les facteurs qui ont eu le plus d'influence dans le passé sont examines par secteurs. Les éléments de l'étude concernent les Etats-Unis pour la période 1900 à nos jours et, pour un certain nombre de pays industrialises, de 1960 à maintenant. Les conclusions de l'article sont que la relation énergie-matières premières est étroite au niveau industriel seulement et que cette relation pourrait être utilisée dans la prévision de la tendance de la consommation. Aunque energía y materias primas son sólo dos de los muchos factores necesarios para la actividad económics, generalmente se supone que existen relaciones especiales entre estos dos recursos. Este artículo examina las evidencias en favor y en contra de la existencia de correlaciones entre suministro de energía y disponibilidad de materias primas y como ellos se relacionan con el crecimiento económico. Las características principales del uso de materias primas y energía en el pasado son examinados en términos de consumo nacional e industrial; luego se examinan los factores más signifacativos que determinaron en el pasado su comportamiento de acuerdo a la misma clasificación sectorial. La información incluida en el estudio corresponde a Estados Unidos para el periodo 1900 al presente, y de 1960 al presente para un número de otors países industrializados. El artículo concluye que la correlación materias-energía es fuerte sólo a nivel industrial y que esta relación puede ser usada para predecir las tendencies futuras de consumo.  相似文献   

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