The Elephant and the Mouse: Canada and the United States

Throughout their history, Canadians have been constantly aware of the Republic to the South. In 1775 the American Revolution spilled over into Canada as the Americans seized Montreal and tried to capture Quebec City. During the War of 1812 Canada received the brunt of American hostility toward Britain, being invaded by the United States at various points along the border, particularly along the New York State frontier. Although successful in repelling the Americans, Canada became very sensitive to her own weakness as contrasted to the growing power of the United States

Development of a National Center for Preservation technology

Issued as Report, Project D-48-80

National historic landmark nomination studies

Issued as Nomination form [nos. 1 & 2], Project D-48-61

Reporting of leases in financial statements; Accounting research study no. 04

https://egrove.olemiss.edu/aicpa_guides/1149/thumbnail.jp

National historic landmark program

Issued as Manuals, nos. 1 & 2, Project no. D-48-68

High-energy asymptotic behavior of the Bourrely-Soffer-Wu model for elastic scattering

Some time ago, an accurate phenomenological approach, the BSW model, was developed for proton-proton and antiproton-proton elastic scattering cross sections at center-of-mass energies above 10 GeV. This model has been used to give successful theoretical predictions for these processes, at successive collider energies. The BSW model involves a combination of integrals that, while computable numerically at fairly high energies, require some mathematical analysis to reveal the high-energy asymptotic behavior. In this paper we present a high-energy asymptotic representation of the scattering amplitude at moderate momentum transfer, for the leading order in an expansion parameter closely related to the logarithm of the center-of-mass energy. The fact that the expansion parameter goes as the logarithm of the energy means that the asymptotic behavior is accurate only for energies greatly beyond any foreseeable experiment. However, we compare the asymptotic representation against the numerically calculated model for energies in a less extreme region of energy. The asymptotic representation is given by a simple formula which, in particular, exhibits the oscillations of the differential cross section with momentum transfer. We also compare the BSW asymptotic behavior with the Singh-Roy unitarity upper bound for the diffraction peak.Comment: 27 pages, 11 figures,revised version to appear in Physical Review

Creep and shrinkage of ecological self consolidating concrete

Optimizing concrete mixtures with regard to replace a part of cement content with supplementary cementitious materials can prompt the design of ecological-self consolidating concrete. By replacing more than 60% of cement with residual product from other industries such as Fly Ash, Micro Silica, and lime, the energy consumption and CO2 emission of concrete are reduced. This study was performed to monitor the creep and shrinkage of high volume supplementary cementitious material of self consolidating concrete (HVSCM-SCC) and ensure desired performance of concrete. Total sixteen and Twenty Four specimens from different concrete mixtures with different replacement level (up to 75% of cement replacement) were monitored for creep and shrinkage respectively. Moist and accelerated curing regimes were utilized in this study to see the effect of accelerated curing on creep and shrinkage of HVSCM-SCC. Mechanical properties of different age 1,3,7,28,56 and 90 days were conducted. Experiments have shown that 75% level replacement of cement experienced low creep and shrinkage rate than other mixtures. The creep and shrinkage values of HVSCM-SCC were compared to prediction models proposal by AASHTO LRFD (2007), ACI-209R (2009), and AS 3600 (2009) to ensure the validity of these models for HVSCM-SCC

Time-Dependent Prestress Loss Behavior of Girders in Missouri Bridge A7957 Compared with a U.S. Data Set of High-Performance Concrete Bridge Girders

In this study, six precast, prestressed concrete girders were constructed and instrumented to measure prestress losses of bridge A7957 in Missouri. The concrete mixture for the bridge was designed with varying mechanical and rheological properties. High-strength concrete, high-strength self-consolidating concrete, and normal-strength self-consolidating concrete were used to construct the bridge girders. Vibrating wire strain gauges with integrated thermistors were embedded through the girders\u27 cross sections to measure strains and temperatures. The measured short- and long-term prestress losses were compared with those obtained using different empirical models, specified in the AASHTO LRFD Bridge Design Specifications and in the PCI Design Handbook: Precast and Prestressed Concrete. This study also presents a comparison of measured prestress losses with data reported in the literature for different concrete types