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.
Results
Showing 1 to 20 of 221 for “"shields"”.
-
Ballistic resistance of multi-layered steel shields
… the ballistic resistance of multi-layered steel shields against projectile impact at the sub-ordnance velocity is evaluated using finite element simulations. Eight types of projectiles of different weight and nose shapes are considered, while the multi-layered shields studied are the …
-
Computational Fluid Dynamic Solutions of Optimized Heat Shields Designed for Earth Entry
… fluid dynamic solutions are obtained for heat shields optimized aerothermodynamically using Newtonian impact theory. Aerodynamically, the low-order approach matches computational simulations within 10%. Benchmark Apollo 4 solutions show that predicted heat fluxes under-predict convective …
-
Bedload Transport in Gravel-Bed Streams under a wide range of Shields Stresses
… demonstrates that under a wide range of Shields stresses, the trends exhibited by the bedload transport data of the two stream types collapse into one continuous curve, thus a unified approach is warranted. Second, an empirical bedload transport relation that accounts for the variation in …
-
MULTIDISCIPLINARY OPTIMIZATION OF NON-SPHERICAL, BLUNT-BODY HEAT SHIELDS FOR A PLANETARY ENTRY VEHICLE
Gradient-based optimization of the aerodynamic performance, static stability, and stagnation-point heat transfer has been completed to find optimal heat shield geometries for blunt-body planetary entry vehicles. In the parametric study, performance trends have been identified by varying geometric …
-
Charming Fictions and Guilty Repetitions: Authorship Other(-)wise by Calixthe Beyala and Carol Shields
My comparative analysis disrupts the notion that Shields is a compliant immigrant whose focus on women's domestic lives fails to address broad social issues. It similarly calls into question Beyala's contrary reputation as a provocative immigrant who refuses integration and is concerned primarily …
-
Investigation of sub-meter shields for a low aspect ratio D-T Tokamak fusion reactor
… power production. The nuclear heating of thin shields (~ 0.1 - 0.2m) of various compositions was explored using the Monte Carlo N-Particle (MCNP) transport code. The principal finding was that nuclear heating is the largest concern to the central inboard components. Nuclear heating of these …
-
A design for a flexible, low-cost rigging block for black-box theaters by Michael J. Shields.
Theater rigging greatly expands both scenic movement and storage options when putting on a production. Small, black-box theaters are often built without rigging equipment in them. Temporary rigging equipment can greatly add to the flexibility of these spaces. A rigging block was designed which can …
-
Incipient Motion Under Shallow Flow Conditions
… on the dimensionless critical shear stress (Shields parameter). Spherical particles of four different densities and an 8mm diameter were used as movable test material. The relative depth ranged from 2 to 12 and the Froude number ranged from 0.36 to 1.29. The results show that the traditional …
-
Comparative Analysis of Electrodynamic Toroidal Radiation Shielding Configurations
… water shielding configurations tested included shields of uniform thicknesses from 1 cm to 10 cm surrounding an Apollo CSM-sized cylindrical candidate spacecraft. Water shielding was found to be very effective at reducing the SPE dose, from a 86\% reduction at 1 cm of water to a 94\% reduction …
-
Taxes, financial distress, and capital structure in the United States and Japan
… debt is negatively related to non-debt tax shields. Effective tax planning requires a firm to consider both the tax and non-tax costs of its financing decisions. Financial distress costs are a non-tax cost of debt financing. Prior studies suggest that it is also important to account for a …
-
"Oh, Must We Dream Our Dreams And Have Them Too?": Transformation Through Reading In Elizabeth Bishop's "Questions Of Travel," Carol Shields' Swann, And Florian Henckel Von Donnersmarck's The Lives Of Others
… Bishop's poem, "Questions of Travel," Carol Shields' novel, Swann: A Mystery, and Florian Henckel Von Donnersmarck's film, The Lives of Others.</p>
-
High moment shield structures for improved linear density capability in thin film recording heads
… control the magnetic properties of high moment shields is impractical due to reader shield-to-shield spacing constraints.<br/><br/>In this work, ultra-thin (≤1nm) underlayers of Ni79Fe21 and Ru are shown to provide a pronounced reduction in the coercivity of both Ni45Fe55 and Co70Fe30 and …
-
Modeling the transport of sand and mud in the Minnesota River
… this using a similarity collapse for bankfull Shields number as a function of slope and grain size, obtained with data for 230 river reaches ranging from silt-bed to cobble-bed. Our analysis shows that bankfull Shields number increases with slope to about the half power. We show that the new …
-
Experimental investigation of the impact of the permeable layer thickness on the surface flow above and the threshold for incipient motion of submerged objects
… of incipient motion was characterized with the Shields parameter, which was estimated with upstream flow velocity measurements. A comparison of the threshold for incipient motion of objects resting on permeable and impermeable beds having the same flow-bed geometries showed larger Shields …
-
A Bf3 Fast Neutron Dosimeter (Long Counter)
… to improve the low energy response. External shields of paraffin, 3 inches thick, and boron-trioxide, 1/2 inch thick, enclose the paraffin cylinder. These shields serve to reduce the background effect and improve the high energy response. Calibration of the counter is accomplished using as …
-
Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… (at α=0.05) positively related to bankfull Shields stress (τ*bf, p=0.04) and bankfull Shields stress adjusted for grain stress only (τ**bf, p=0.02). In stream reaches hosting bull trout redds, reach-average redd density was significantly positively related to reach-average τ**bf (p=0.02) and …
-
Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… (at α=0.05) positively related to bankfull Shields stress (τ*bf, p=0.04) and bankfull Shields stress adjusted for grain stress only (τ**bf, p=0.02). In stream reaches hosting bull trout redds, reach-average redd density was significantly positively related to reach-average τ**bf (p=0.02) and …
-
CFD modeling of a tailgate ventilation condition in a longwall bleeder system
… face and/or poor caving conditions behind the shields can both pose a safety risk at any longwall operation. Poor gob caving can lead to insufficient face air quantity with which to dilute methane at the tailgate corner, while a blocking of the tailgate by a roof fall can carry …
Page 1 of 12