Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 132 for “"Trenches"”.
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Seepage through longitudinal drainage trenches
The objective of this study was to determine how the longitudinal drain system works under laboratory conditions. In this study, a bench-scale model was constructed to assess the flow patterns caused by a trench drain in a slope. The experimental variables include the trench spacing (w), seepage …
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Air trenches for dense silica integrated optics
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Seepage in earth slopes with longitudinal drainage trenches
The major objective of this study was to determine the effect of hydraulic conductivity on the effectiveness and efficiency of longitudinal drains and on the time to reach steady state seepage under controlled laboratory conditions. An apparatus capable of simulating different slope angles and …
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A study of infiltration trenches in unsaturated soil
… work reported here is a study of infiltration trenches in unsaturated soil. The infiltration rates and the water content distributions in soil calculated by Fok's model and a finite-difference model are compared for both the Ida silt loam soil and the Webster clay loam soil considering the …
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Teacher Evaluation in an Urban Setting: A View from the Trenches
<p>This study utilizes a mixed-methods methodology to examine how a teacher evaluation system is influencing the instructional practices of bilingual teachers in a large urban district. An on-line survey was administered to examine the bilingual teachers’ perceptions of the evaluation system. A …
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Power handling of liquid metal infused trenches in the EAST Tokamak
… of a trenched front face with 2mm wide 1mm trenches, these trenches allow for lithium flow to be driven by TEMHD via the Seebeck effect. Previous work at UIUC has shown the ability for a LiMIT design to produce velocities of ∼ 60cms−1 and withstand heat fluxes of 10MWm−2 under electron beam …
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Sediment Deposition in the Deep Sea: from Seamounts to the Hadal Trenches
… in the North Atlantic and Pacific hadal trenches were observed via a radionuclide approach (234Th and 210Pb) in terms of assessing the control mechanism of carbon deposition to the seafloor. It is understood that topographical features alter the path of hydrological flow and these, in …
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Digital diffusion in the clinical trenches : findings from a Telemedicine Needs Assessment
Broadly stated, this dissertation focuses on how practitioners and provider organizations integrate the computer and web into healthcare delivery. The opportunity that afforded this research was a Telemedicine Needs Assessment commissioned by a Massachusetts-based provider organization, consisting …
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Confinement of microplasma in silicon trenches with widths as small as 2.5 μm
In plasma science, the ability to confine plasma in cavities with characteristic dimensions less than 1 μm would represent a major milestone. In this thesis, realization of microplasma inside channel devices with the characteristic dimensions of 5 μm and 2.5 μm is discussed. Data collected during …
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Burnout in the Trenches: Unpacking the Systemic Forces Impacting Community Mental Health Clinicians
Across United States (US) history, individual and population-based mental health has been overlooked or outright dismissed within the health care system. In 1955, 77% of all mental health treatment episodes took place in an inpatient setting, and only 379,000 episodes of treatment were provided in …
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The effect of distance between artificial drainage facilities and disposal trenches on the movement of biological and chemical pollutants from septic tank effluent
… family of Typic Ochraquults. Four prototype trenches were installed at 1.5, 3, 6 and 21 m from the edge of a drainage ditch which was 1.5 m deep. The trenches were pressure dosed equally with 2.4 to 4 cm per day. Replicated nests of sampling wells at depths 90, 150 and 300 cm were placed with …
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“We’re both in the trenches together”: a pluralistic exploration of attachment behaviour dynamics in a heterosexual couple relationship across the transition to second-time parenthood
Attachment theory provides a framework for categorising behaviours in close relationships by individuals during times of stress. Attachment behaviours are commonly thought to be determined in early childhood experiences and assumed to hold through to adulthood. Further, these behaviours become …
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Identifying lateral spread fissures with ground penetrating radar in the New Madrid seismic zone
… conducted over these areas and correlated to two trenches and one hand-dug pit. Panda cone penetration tests (Panda CPT) were performed at three sites and correlated to the GPR data. 3D GPR models were created for each GPR survey, and grain size analyses were performed for sediment samples taken …
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Experimental and numerical analysis of thermoelectric magnetohydrodynamic driven liquid lithium flow in open channels for fusion applications
… flow within horizontally placed metallic open trenches when an external magnetic field is transverse to the trench walls. Experiments at the University of Illinois have yielded experimental lithium velocities of 0.22±0.03 m/s under a magnetic field of 0.059T, and a similar experiment on HT-7 …
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Foreign fields: identity and location in soldiers' writings of the First World War
… into non-existence the interlocking system of trenches was the only remaining geographical construct that held any meaning. The soldiers discovered and developed a geography of identity based on proximity to the front line. This new map of the trenches is not plotted through cartography, but …
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Surface Reaction Mechanisms for Plasma Processing of Semiconductors
Cleaning of residual polymer from trenches following etching and the deposition of a continuous barrier layer are critical processes for integration PS as ILDs. To investigate these issues, a reaction mechanism for plasma stripping of residual fluorocarbon polymer using oxygen-based chemistries has …
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Fault segmentation and paleoseismicity along the North Wutaishan Fault of the Shanxi Graben System, China
… using high resolution satellite imagery. Three trenches were excavated for paleoseismic and slip rate investigations on a 4.5 km long section of the fault located at the eastern end of the basin. Two of the three trenches had a depth and length of ̃8 and 16 meters respectively while the other …
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Vortex distributions and dynamics in superconductors near surface steps and sample edges studied by scanning SQUID microscopy and critical current measurements
… superconducting thin films with etched surface trenches. The vortex distributions are significantly altered in the vicinity of the surface steps, and we have found evidence for a possibly paramagnetic compression of flux into surface trenches on thin film samples. We have studied vortex …
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Runoff Impacts And Lid Mitigation Techniques For Mansionization Based Stormwater Effects In Fairfax County, Va
… include bioretention basins, infiltration trenches, amended soils, permeable pavement, and cisterns. Results indicate that placing bioretention basins or infiltration trenches on 0.5% of the subwatershed or amending 20% of the open space with soil composts would reduce the runoff volume …
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Reduction in ground vibrations by the use of wave obstacles
… here by use of numerical simulations, trenches and shaped landscapes being considered as wave obstacles. The effects of geometric parameters on open trenches, material parameters of filled trenches, and of infiltrated water in open trenches, were examined in appended Paper A. The finite …
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