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 67 for “"standoff"”.
-
Standoff Screws Used In Composite Joists
… of the 5/16 in. diameter Elco Grade 8 standoff screw as a mechanical shear connector in composite joists. Standoff screws are being investigated as an alternative to welded shear studs in short span composite joists. The data and results obtained from 106 pushout tests performed on the …
-
Landmine detection with a standoff acoustic/laser technique
… the landmine threat. This paper explores a standoff acoustic/laser technique to discriminate landmines from other forms of man-made objects (clutter) in an urban environment. A novel approach currently under investigation by MIT Lincoln Labs, University of Mississippi, and other groups …
-
Strength Calculation Model for Standoff Screws in Composite Joists
… from push-out tests utilizing the ELCO Grade 8 standoff screws. The goal is to develop a strength prediction equation and determine reliability parameters compatible with the Load Factor Resistance Design (LRFD) procedure that would allow the use of this shear connector in design of composite …
-
Further Investigation of Standoff Screws Used in Composite Joists
… of the 5/16 in. diameter Elco Grade 8 standoff screw as a mechanical shear connector in composite joists. Standoff screws are being investigated as viable an alternative to welded shear studs in short span composite joists. The data and results obtained from 59 pushout tests performed …
-
Standoff Laser Interferometric Photoacoustic Spectroscopy for the Detection of Explosives
… explosive materials. Performing detection at a standoff distance is much safer and this is the impetus for this work. Photoacoustic spectroscopy is well suited to the task of explosive detection at a standoff distance. A detailed theory of the standoff measurement of the physical response of a …
-
Optimal standoff imaging using structured laser illumination and graphical models
… reconstruction, however, is far from optimal for standoff imaging, for which rough-surfaced objects create laser speckle in the measurements. We develop a graphical model that encompasses the probabilistic relationships in structured-illumination standoff imaging along with an approximate …
-
Standoff screws functioning as mechanical shear connectors in composite joists
… utilizing the Elco grade 8, 5/16 in. diameter, standoff screw functioning as a mechanical shear connector are presented. In all tests, the base material, through which the screw was fastened, was fabricated out of back to back angle to simulate the top chord of an open web steel joist. Varied …
-
Influence of Nozzle Pressure, Standoff Distance, and Reinforcing Steel Cage on Water Jetting of CIDH Pile Anomalies
… and to evaluate how jetting pressures and standoff distance from the material surface affect water jetting of concrete type materials and PVC tubing. The experimental work consisted of water blasting submerged test specimens using rotary jets, nozzles, pumping equipment, and testing …
-
The Development of A Spatial Heterodyne Spectrometer For Raman Spectroscopy
… for a wide range of applications, including standoff planetary measurements. NASA has stated a desire for small, space-flight capable instruments with minimal or no moving parts that can be used to analyze minerals and detect organic molecules and biomarkers on other planets. Raman …
-
Impulse loading of near-field shallow-buried explosions
… mass, explosive diameter to height ratio, standoff distance, depth of burial, and soil properties. This investigation entails the development of an empirical equation for predicting total impulse by applying regression analysis. A series of comparative test results were obtained with the …
-
The Dynamics of Single and Double Cavitation Bubbles and Interaction Between Bubbles and Different Materials
… For bubble collapsing near a rigid wall, when standoff ratio γ < 0.6, the ring collapse is the most prominent pressure source. The jet takes the strongest effects at γ = 1.12. The pressure is minimal at γ = 0.913. After the first jet impingement, a second ring collapse will follow and input the …
-
A Numerical Study of Supersonic Rectangular Jet Impingement and Applications to Cold Spray Technology
… are simulated for two cases for the standoff distance between the nozzle exit and the substrate. Flow structures, mean flow properties, particles impact velocity and particles deposition efficiency on a flat substrate surface are presented. Different grid resolutions are tested using …
-
Characterization of Onset and Transition to Instability in Supersonic Retropropulsion
… cases taken at a freestream Mach of 3. Shock standoff distance and oscillation amplitude was increased with increasing forebody diameter and increasing freestream Mach number. Carbon Dioxide-Helium cases also exhibited both higher oscillation amplitude and shock standoff distance than …
-
Investigation of Resonant Enhanced Multiphoton Ionization of Solid State High Explosives With Laser Ablation
… selectivity. </p><p> In an attempt to develop a standoff REMPI capability, microwave detection of a laser-induced plasma was investigated, using both homodyne and heterodyne microwave detection schemes. If successful, this could lead to a standoff REMPI technique for remote HE measurements.</p>
-
Processing and Reliability Assessment of Solder Joint Interconnection for Power Chips
… process, which is able to produce high standoff hourglass-shaped solder joint that consists of an inner cap, middle ball and outer cap, as well as the conventional solder bumping process have been successfully developed for power chips by using stencil printing. This solder bumping …
-
Novel modulated antennas and probes for millimeter wave imaging applications
… elements, reducing the sensitivity to standoff distance variations in near-field imaging, and designing a simple and accurate vector network analyzer (VNA) for in-situ imaging applications. The concept of modulating millimeter wave antenna and scatterer structures, directly to increase …
-
No Way Out: A Historical Documentary
… "No Way Out". The film deals with a 1974 inmate standoff at a prison in Huntsville, Texas known as the Carrasco Incident. The film examines the prison takeover through the eyes of those who lived through it. Composed of five interviews, "No Way Out" is a compilation of various points of view …
-
Vehicle Shaping for Mine Blast Damage Reduction
… reduced the impulse by up to 45%. Increasing standoff distance reduced impulse by up to 70%.
-
A Decade of Failure; Missed Opportunities and the Escalating Crisis over Iran's Nuclear Program
… of missed opportunities to defuse the nuclear standoff with Iran. The first was in May 2003 when Iran sent the U.S. government via the Swiss a proposal for discussions on a ―grand bargain‖ to restore ties between Tehran and Washington. The Bush administration did not even respond. Britain, …
Page 1 of 4