The Politics of Location: Doing Feminist Research at “Home”*     

Melissa R. Gilbert 《The Professional geographer》1994,46(1):90-96

Feminist research methodologies have many advantages over more traditional positivist methodologies. Feminist research is differentiated from nonfeminist research in terms of its critiques of universality and objectivity and its emancipatory purpose. Drawing on my own research on the survival strategies of low-waged women workers in Worcester, Massachusetts, I argue that we need to examine more critically our feminist research methods in terms of the unequal power relationships on which the research process necessarily rests.  相似文献   

A water column sampler for invertebrates in salt-marsh tidal pools     

A. T. Gilbert  E. Ruber 《Estuaries and Coasts》1986,9(4):380-381

A column sampler for use in shallow (1 m) pools is described. The apparatus is a 10-cm diameter PVC pipe mounted on a base plate. A sliding trap on the base plate is attached to a cable which runs over a pulley to the upper part of the sampler. A whole water column of 78 cm² is sampled and 1–2 cm of substrate can be included as desired. The sampler has been used successfully in salt marsh pools to census gastropods, amphipods, and copepods.  相似文献   

Comparison between the Galicia and Aquitaine margins     

Gilbert Boillot 《Tectonophysics》1986,129(1-4)

There is a great similarity between the Galicia margin and the Aquitaine margin (i.e. the Aquitaine Basin and the North Pyrenean zone). In particular, the timing of the rifting as well as the resulting structures (exposure of perodotite, tilted fault blocks, normal and transverse faults, half grabens) are practically the same. This comparison leads to the interpretation that the northern side of the Pyrenean fold belt is inherited from the Mesozoic deep passive margin of Europe. The Cenozoic thrust sheets and reverse faults of the northern Pyrenees zone are tentatively interpreted as former rift structures (tilted blocks and listric faults) which were removed during the convergence of the Iberian and European plates during the Paleocene and Eocene.  相似文献   

Interceptor Trenches for Positive Ground Water Control     

Seward G. Gilbert  James J. Gress 《Ground Water Monitoring & Remediation》1987,7(2):55-59

Interceptor trenches are an effective ground water control method at waste management sites. Trenches may be installed without disturbing the wastes, and the withdrawal of ground water recovers contaminants that have left the waste management perimeter. The rapid and steep depression of the piezometric surface on both sides of the trench is positive proof of a barrier to horizontal flow across the trench in the affected permeable units.
Historically, the construction of interceptor trenches has been very difficult. A new and efficient installation method has been developed and successfully utilized for several applications at a petrochemical facility on the Texas coastal plain. Rapid and cost-effective installation is made possible by innovations in sump and trench construction and the tie-in between the two.
The sump is constructed first using standard well construction techniques to drill a 96-inch diameter hole to contain the 42-inch diameter polyethylene pipe sump. A European designed and fabricated trenching machine then excavates the trench, inserts the drainage pipe and backfills with sand and/or gravel in one operation. A specially designed perforated pipe entry door built into the side of the sump barrel provides for efficient and safe connection of the drainage pipe to the specially designed collection sump. The effectiveness of interceptor trenches has been confirmed in full scale applications through the reversal of flow gradients and the prevention of continued horizontal migration of ground water contaminants.  相似文献   

Basalts and phase diagrams: An introduction to the quantitative use of phase diagrams in igneous petrology : S.A. Morse. Springer, Berlin, 1980, XVI + 493 pp., DM62.00, approx. U.S.$36.60 (hardcover)     

W. G. Ernst 《Tectonophysics》1982,86(4):401-402

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Regional policy in Costa Rica: The problems of implementation     

Ernst A. Brugger 《Geoforum》1982,13(2):177-192

In most Third World countries regional planning and regional policy is formally well-developed, but in practice is not implemented. In spite of increasing regional disparities, narrow sectoral and centrally decided programmes and projects dominate over territorial and decentralized ones. This article examines theoretically and empirically why, in the case of Costa Rica, the implementation problem is so difficult and which strategic approaches would best suit an effective regional policy.  相似文献   

Glaciolacustrine varved sediment as an alpine hydroclimatic proxy     

K. R. Hodder  R. Gilbert  J. R. Desloges 《Journal of Paleolimnology》2007,38(3):365-394

The physical significance of a negative correlation between a varve record from Mud Lake, British Columbia, and temperature is discussed in the context of a process-network. The process-network is defined as the system of temporally and spatially connected processes involved in the transfer of a signal from climate to varved glaciolacustrine sediment. The six systems defining the network include climate, glacier, fluvial, geomorphic, terrestrial biologic and lacustrine systems to which each process belongs. A literature review outlines significant variation in the strength and character of correlations between components of the process-network and highlights that more comprehensive interpretations of varves as a hydroclimatic proxy require an improved understanding of the process-network. Documenting each process in the network is integral to informing a more complete model of this system, identifying processes that constitute signal transfer and assessing hydroclimatic proxies based on linear correlation. Such documentation is of growing importance as varved lacustrine sediments are increasingly used as a hydroclimatic proxy. The complex nature of the process-network requires greater emphasis on interdisciplinary cooperation and alternative methods to the linear statistical model.  相似文献   

High-Frequency Hydroacoustic Monitoring in an Underground Iron Mine     

Séverine Bernardie  Jean-Pascal Gilbert  François Lebert  Hubert Fabriol 《Pure and Applied Geophysics》2007,164(1):177-197

The monitoring of the stability of old mines constitutes an important research objective for our institution, BRGM. The study reported here shows the contribution of high-frequency (>30 kHz) acoustic emissions to the detection of the damage within a rock mass, during an experiment within a pilot site of an old flooded iron mine. The experiment consisted of recording all the hydroacoustic events in a broad frequency band (between 30 Hz and 180 kHz), during 18 months. The monitoring network has been calibrated by a triggered block fall that made it possible to highlight a relationship between the occurrence of high-frequency/low-frequency hydroacoustic emissions and rock falls. The events recorded have been associated with the micro-failure of the rock mass near the roof, prior to the detachment of the blocks. This monitoring showed important high-frequency hydroacoustic activity, which may be associated with mechanical instabilities generated by the evolution of water pressure during the experiment. In conclusion, the high-frequency hydroacoustic activity appears to be a good indicator of instability and, therefore, this new technique constitutes a promising tool for monitoring abandoned underground cavities.  相似文献   

Future ocean uptake of CO2: interaction between ocean circulation and biology   总被引：1，自引：0，他引：1  

Ernst Maier-Reimer  Uwe Mikolajewicz  Arne Winguth 《Climate Dynamics》1996,12(10):711-722

We discuss the potential variations of the biological pump that can be expected from a change in the oceanic circulation in the ongoing global warming. The biogeochemical model is based on the assumption of a perfect stoichiometric composition (Redfield ratios) of organic material. Upwelling nutrients are transformed into organic particles that sink to the deep ocean according to observed profiles. The physical circulation model is driven by the warming pattern as derived from scenario computations of a fully coupled ocean-atmosphere model. The amplitude of the warming is determined from the varying concentration of atmospheric CO₂. The model predicts a pronounced weakening of the thermohaline overturning. This is connected with a reduction of the transient uptake capacity of the ocean. It yields also a more effective removal of organic material from the surface which partly compensates the physical effects of solubility. Both effects are rather marginal for the evolution of atmospheric pCO₂. Running climate models and carbon cycle models separately seems to be justified. Received: 9 August 1995 / Accepted: 22 April 1996  相似文献   

Beitrag zur Charakterisierung und Identifizierung organischer Stoffe niederer molarer Massen in biologischen Kläranlagenabläufen     

W. Elsßer  E. Gilbert  S. H. Eberle 《洁净——土壤、空气、水》1992,20(2):82-91

Contribution to the characterization and identification of low molecular weight organic substances in biologically treated effluent. In a review it is shown that by determination of sum parameters only 25% of low molecular weight substances <1000 Dalton in biologically treated effluent can be divided into different classes of compounds. A method is described to separate the low molecular weight compounds (freeze concentration, electrodialysis, vacuum evaporation, freeze drying) in order to identify single compounds. In a first GC-MS analysis 87 compounds, among them a high proportion of substances with hetero atoms, could be identified. Their concentrations lie between 0,1 and 3 μg/1. Only 3% of the low molecular weight fraction related to the DOC value is covered by the identified substances. Therefore it can be assumed, that a broad variety of low molecular weight compounds in very low concentrations is present in the effluent of biological treatment plants.  相似文献