Chemical Reactivity of Hydrogen, Nitrogen and Oxygen Atoms at Temperatures Below 100 deg K Semiannual report, 1 Jul. - 31 Dec. 1966

Chemical reactivity of hydrogen, nitrogen, and oxygen atoms at temperatures below 100 deg

The Ruinous Northern Frontier: The Decline and Collapse of Frontier and Roman Civilizational Integrity on the Danube, A.D. 370 - 500

The imperial Roman advance to and entrenchment along the Danube from the times of Augustus to Aurelian, mirrored by the slow development of various Germanic peoples beyond the 1,700-mile river’s northern bank, set the stage for a series of climactic engagements between the late Roman Empire and their various barbarous neighbors along what had quickly become the Empire’s most important and unstable frontier. The immigration and settlement of Goths from the Pontic Steppe, fleeing the Huns as they emerged from Central Asia, within the Roman Balkans undermined the Danube frontier, eviscerated the Eastern Roman field army, and enabled Alaric’s role as a destabilizing free radical between the estranged imperial Roman courts at Rome and Constantinople from 395 to 410. At the same time, the Huns, colliding with the Roman frontiers on the Middle and Lower Danube, began to amass on the Pannonian and Romanian Plains, and exerted a steadily increasing pressure on the Roman frontier. After having buckled several times, particularly in Roman Pannonia on the increasingly isolated Middle Danube, from the 410s to the 430s, Attila led two major invasions of the Eastern Roman Empire in 441-442 and 447. Recognizing the importance of the Danube frontier to safeguarding imperial security, Attila forced the Eastern Romans to completely abandon the Middle and Lower Danube, evacuating all military posts and major populations at least a five-days march south of the river, thereby destroying the Roman Danube frontier as the weakening Empire advanced into late fifth century

A 3D Parallel Algorithm for QR Decomposition

Interprocessor communication often dominates the runtime of large matrix computations. We present a parallel algorithm for computing QR decompositions whose bandwidth cost (communication volume) can be decreased at the cost of increasing its latency cost (number of messages). By varying a parameter to navigate the bandwidth/latency tradeoff, we can tune this algorithm for machines with different communication costs

Gas chromatograph tests of gasoline samples

Issued as Final report, Project no. A-232-80

Description and factor analysis of the use of selected practices by Tennessee grade A dairymen in 1970 and 1975

The purpose of this descriptive study was to compare the use of. selected dairy production and management practices by Grade A dairymen in 32 major dairy producing counties at two time periods (i.e., FY 1970 and FY 1975) in order to indicate the amount of change in use of recommended production practices during the five year period. Factor-analytic techniques were then employed to determine interrelations between practices used by Grade A dairymen and to reduce the data into smaller sets of factors or components for further analysis. Data were secured through personal interviews by County Extension Leaders in each of the 32 major dairy counties. Each interview was conducted in the same manner following an interview schedule prepared specifically for each survey. The Statistical Package for Social Sciences computer program was used to analyze the data. Results of the data analysis were organized and summarized in separate tables, each dealing with selected aspects of the study. The approach to summary and interpretation of findings was basically descriptive in nature with emphasis upon comparison of practice use at the two time periods. Major findings of the study are briefly stated as follows: 1: The average herd size of Grade A dairymen in 1970 was 59 cows and an average of 10,029 pounds of milk per cow was produced. The average income per Grade A dairymen from the sale of milk in 1970 was $29,398. 2. Grade A dairymen in 1975 operated an average of 336 acres of cropland. It was also observed that the producers had an average of 11,981 pounds of milk and 449 pounds of butterfat produced per cow. 3. Eleven recommended dairy production practices were selected from the two dairy surveys for purposes of comparing the percentage of producers using these practices in 1975 with those in 1970. It was observed that the average percentage of all dairymen using each of the eleven recommended dairy practices had increased for six practices and had decreased for five of the practices between 1970 and 1975. 4. In reviewing the interrelations among dairymen\u27s use of 21 practices in 1970 it was found that four practices were the most highly related to the use of the largest number of other recommended practices. These practices involved, breeding cows to a plus A.I. proof bull; providing of ade-quate forages; feeding grain according to production; and maintaining adequate milk production records. 5. Three of the 22 practices in 1975 where dairymen\u27s use was measured qualitatively showed a high correlation with a large number of other practices. These practices were, checking the milking machine every six months; feeding grain according to production; and keeping dry cows separate from the herd. 6. Grade A dairymen\u27s use of only one recommended practice was significantly related (p\u3c.05 or greater) to their use of nine or more of the 16 recommended dairy practices measured quantitatively in 1975. This practice was defined as What percent of your pasture land was limed and fertilized based on soil test at the time of seeding? 7. Eleven of the 21 recommended practices were found to load most heavily on seven of the factors extracted from the 1970 Grade A Milk Production Practice Checklist Survey. 8. Twelve of the 22 practices were found to be highly related (loading of greater than .40) to the seven factors extracted from the 1975 data measured qualitatively. 9. Ten of the 16 practices factor analyzed were found to be highly related to the seven factors extracted from the quantitatively measured 1975 survey data. 10. The practices of providing high quality forages, keeping dry cows separate from the herd, and the number of times per day the herd was checked for heat, accounted for a higher percentage of the variation in practice use among the dairymen than did any of the other practices included in the two dairy surveys. 11. The seven common factors extracted for the practices studied in 1970 accounted for about 50 percent of the variation in the use of the practices studied. Forty-seven percent and 58 percent, respectively, of the total variance in the use of all practices was accounted for by the common factors observed in the qualitative and quantitative measures in the 1975 dairy survey. Conclusions and recommendations are also included

Style and Configuration in Prehistoric Iconography

The iconography of ancient art has to do with making propositions about what that art depicts. Stylistic studies, in contrast, make propositions about the sharedness of formal properties with other objects. These can be done separately. Although many iconographic analyses of ancient art proceed with little or no consideration of style, I argue that the two modes of analysis are interdependent. I offer a methodological case that stylistic analysis is logically prior to iconographic study in the domain of ancient art. This observation argues for a distinctively staged approach to the iconography of ancient objects, one in which detailed stylistic study is a necessary prerequisite to success in determining the referents of representations