Study of Bonding Between Glass and Plastic in Glass-reinforced Plastics, Extended Work Quarterly Progress Report, Jul. 1 - Sep. 30, 1966

Chemical bonding between glass and plastic in glass reinforced plastic composite materia

A study of bonding between glass and plastic in glass-reinforced plastics, phase II SUMMARY technical report no. 2, Nov. 1, 1964 - Oct. 31, 1965

Bonding between plastic materials and inorganic substrate in glass-reinforced plastic

Study of bonding between glass and plastic in glass-reinforced plastics - Extended work Quarterly progress report, Oct. 1 - Dec. 31, 1966

Surface modification effects on composite materials - chemical bonding between glass and plastic in glass reinforced plastic

Study of bonding between glass and plastic in glass-reinforced plastics - extended work Quarterly progress report no. VII, 1 Apr. - 30 Jun. 1966

Bonding between silica glass reinforcement and plastic matrix of glass-reinforced plastic composite materia

A study of bonding between glass and plastic in glass-reinforced plastics - Phase II QUARTERLY progress report no. VI, 1 May - 31 Jul. 1965

Direct bond formation between glass and plastic in glass-reinforced plastic materials - alkylation of surface-based silicon atoms for producing Si-R group

Multipurpose binocular scanning apparatus

Optical gimballing apparatus directs narrow fields of view throughout solid angle approaching 4 pi steradians. Image rotation produced by scanning can be eliminated or altered by gear trains directly linked to the scanning drive assembly. It provides the basis for a binocular scanning capability

An Automated Technique for Estimating Daily Precipitation over the State of Virginia

Digital IR and visible imagery obtained from a geostationary satellite located over the equator at 75 deg west latitude were provided by NASA and used to obtain a linear relationship between cloud top temperature and hourly precipitation. Two computer programs written in FORTRAN were used. The first program computes the satellite estimate field from the hourly digital IR imagery. The second program computes the final estimate for the entire state area by comparing five preliminary estimates of 24 hour precipitation with control raingage readings and determining which of the five methods gives the best estimate for the day. The final estimate is then produced by incorporating control gage readings into the winning method. In presenting reliable precipitation estimates for every cell in Virginia in near real time on a daily on going basis, the techniques require on the order of 125 to 150 daily gage readings by dependable, highly motivated observers distributed as uniformly as feasible across the state

The Exchange Rate Exposure of U.S. and Japanese Banking Institutions

In this paper, we examine the foreign exchange exposure of a sample of U. S. and Japanese banking firms. Using daily data, we construct estimates of the exchange rate sensitivity of the equity returns of the U.S. bank holding companies and compare them to those of the Japanese banks. We find that the stock returns of a significant fraction of the U. S. companies move with the exchange rate, while few of the Japanese returns that we observe do so. We next examine more closely the sensitivity of the U.S. firms by linking the U.S. estimates cross-sectionally to accounting-based measures of currency risk. We suggest that the sensitivity estimates can provide a benchmark for assessing the adequacy of existing accounting measures of currency risk. Benchmarked in this way, the reported measures that we examine appear to provide a significant, though only partial, picture of the exchange rate exposure of U. S. banking institutions. The cross-sectional evidence is also consistent with the use of foreign exchange contracts for the purpose of hedging.Foreign Exchange Risk, Banking, Market Risk

Using the High Productivity Language Chapel to Target GPGPU Architectures

It has been widely shown that GPGPU architectures offer large performance gains compared to their traditional CPU counterparts for many applications. The downside to these architectures is that the current programming models present numerous challenges to the programmer: lower-level languages, explicit data movement, loss of portability, and challenges in performance optimization. In this paper, we present novel methods and compiler transformations that increase productivity by enabling users to easily program GPGPU architectures using the high productivity programming language Chapel. Rather than resorting to different parallel libraries or annotations for a given parallel platform, we leverage a language that has been designed from first principles to address the challenge of programming for parallelism and locality. This also has the advantage of being portable across distinct classes of parallel architectures, including desktop multicores, distributed memory clusters, large-scale shared memory, and now CPU-GPU hybrids. We present experimental results from the Parboil benchmark suite which demonstrate that codes written in Chapel achieve performance comparable to the original versions implemented in CUDA.NSF CCF 0702260Cray Inc. Cray-SRA-2010-016962010-2011 Nvidia Research Fellowshipunpublishednot peer reviewe

Boundary layer thickness effect on boattail drag

A combined experimental and analytical program was conducted to investigate the effects of boundary layer changes on the flow over high angle boattail nozzles. The tests were run on an isolated axisymmetric sting mounted model. Various boattail geometries were investigated at high subsonic speeds over a range of boundary layer thicknesses. In general, boundary layer effects were small at speeds up to Mach 0.8. However, at higher speeds significant regions of separated flow were present on the boattail. When separation was present large reductions in boattail drag resulted with increasing boundary layer thickness. The analysis predicts both of these trends