Probing the Structure of the Pomeron

We suggest that the pseudo-rapidity cut dependence of diffractive deep-inelastic scattering events at HERA may provide a sensitive test of models of diffraction. A comparison with the experimental cross section shows that the Donnachie-Landshoff model and a simple two-gluon exchange model of the pomeron model are disfavoured. However a model with a direct coupling of the pomeron to quarks is viable for a harder quark--pomeron form factor, as is a model based on the leading-twist operator contribution. We also consider a direct-coupling scalar pomeron model. We comment on the implications of these results for the determination of the partonic structure of the pomeron.Comment: 33 pages, LaTeX2e, 14 figures, uses axodra

Analysis of Rapidity Gap Cuts in Diffractive DIS

The requirement of a large pseudo-rapidity gap to select diffractive DIS events at HERA restricts the kinematically accessible region of phase space for a significant range of $Q^2$, $\beta$ and \xpom. Consequences of this include a breakdown of \xpom-factorization in large rapidity gap diffractive samples and an enhancement in the relative contribution of quark-antiquark-gluon processes over dijet processes in the diffractive DIS sample.Comment: LaTeX, 3 pages, 2 figures in PS files, uses npb.sty. Contribution to the Proceedings of the 7th International Workshop on Deep Inelastic Scattering and QCD, DIS99, DESY-Zeuthen, April 1999; Nucl. Phys. B (Proc. Suppl.

Hadronic production of a Higgs boson and two jets at next-to-leading order

We perform an update of the next-to-leading order calculation of the rate for Higgs boson production in association with two jets. Our new calculation incorporates the full analytic result for the one-loop virtual amplitude. This new theoretical information allows us to construct a code including the decay of the Higgs boson without incurring a prohibitive penalty in computer running time. Results are presented for the Tevatron, where implications for the Higgs search are sketched, and also for a range of scenarios at the LHC.Comment: 16 pages, 4 figure

A Bait Attractant Study of the Nitidulidae (Coleoptera) at Shawnee State Forest in Southern Ohio

Four baits were tested for efficacy in attracting sap beetles (Nitidulidae) at two sites in the Shawnee State Forest over two collection periods in 1992. Species taken were categorized into three groups: abundant, moderate, and uncommon. At Site 1, nitidulids displayed a strong preference for whole wheat bread dough, followed by fermenting brown sugar, and fermenting malt/molasses solution, and vinegar, respectively. Site 2 collections showed a similar trend to Site 1, but the order of preference was switched for brown sugar and malt/molasses solution. Of the 20 species collected, six species were abundant, seven species were moderate, and seven species were locally uncommon

Report No. 2 on a Test Road for the Evaluation of Sandstone as an Aggregate in Plant-Mix Bituminous Pavements

This report which presents results from additional study of the Sandstone Test Road located on S.R. 30 in Magoffin and Breathitt Counties, is a supplement to Report No. 1 dated April, 1952. The project consisted of a laboratory investigation and construction of a 20-mile test road, with all the original work carried out over a period from early 1950 to November 1951. Details concerning both laboratory and field work are contained in Report No. 1 and need not be discussed here. However, to keep the general objectives of the study clear, they are restated as follows: To develop comprehensive information concerning the nature and character of sandstone throughout Eastern Kentucky. To establish standards for crushed sandstone as a bituminous paving aggregate. To establish design criteria for sandstone-bituminous mixtures. To examine the feasibility of utilizing full crusher output. To establish construction standards and practices commensurate with the processing and handling characteristics of the stones and paving mixes. Specifications, based on results of the original study in 1950 and 1951 were prepared, and in 1952 more than 40 miles of sandstone pavements were constructed under contract. When the original study was concluded, it was realized that the value of specifications, as well as the value of other results, was contingent upon the ultimate performance of the paving mixtures in the Test Road. Hence, final evaluation was dependent upon a series of pavement condition surveys with supplemental tests on samples of the pavement. This report is concerned with three of the surveys in this series, and with tests on cores taken from the road. With the exception of data pertaining to types of failures, most of which are directly attributed to base and drainage conditions, nothing in the report is considered conclusive at this stage. Rather, the report constitutes a record of performance and a part of the information from which conclusions will ultimately be drawn

A Test Road for the Evaluation of Sandstone as an Aggregate in Plant-Mix Bituminous Pavements

In eastern Kentucky, deep deposits of sandstones and shales overlie the vast deposits of limestones that prevail throughout the central part of the state. Whereas locally available limestones of high quality comprise the major sources of crushed stone or aggregate for highway paving in the central part of the state, some areas of eastern Kentucky are so far removed from sources of these and other high-type aggregates that transportation of materials becomes a major cost item. It is a matter of record that these costs frequently approach or even exceed the cost of the material at the source, Since aggregate comprises the greater bulk of a paving mixture; transportation costs, to a large extent, determine the selection of the type and source of the material

Observations of Stabilized Turf Shoulders

The improvement of highway shoulders, from the standpoint of appearance and practical value, has been and is at present of considerable interest to all highway departments. A great deal of effort has been expended in the past to develop grass combinations which not only will prevent natural erosion of the surface materials but also impart a pleasing appearance to shoulders and slopes. Attempts to include factors of practical value, such as safe support of traffic loads, have greatly magnified the problem. Numerous types of paved shoulders have been introduced which are quite satisfactory with respect to load bearing but are expensive to construct and often do not equal in appearance the more attractive turf shoulders. Stabilized turf shoulders have been adopted by several state and federal agencies in an attempt to combine aesthetic qualities with those of a practical nature. These shoulders are made principally of granular material but contain sufficient soil to support vegetation, and generally they are covered with a thin layer of topsoil to provide a seed bed. Limited data available indicate that these efforts have been rather successful. The first study of stabilized turf shoulders in Kentucky was initiated during the 1954 construction season when the Division of Design designated an experimental section to be used for this purpose. This site was located on a 6 mile reconstruction project on U.S. 31-W and U.S. 68 from Bowling Green, to the intersection of the two routes at a point approximately 7 miles northward, Project No. I 16 (2) and 113 (5), see Fig. 1. The Division of Research was requested to observe and report on construction procedures and the effectiveness of turf shoulders constructed in this area. The roadway located in this section consists of two traffic lanes in each direction, separated by a depressed median strip 2.0 feet wide. The median strip was constructed in the conventional manner and only the outside shoulders were stabilized. Three different means of stabilization were used, including hardstands at selected intervals with conventional earth shoulders in between

Report No. 1 on a Water-Bound, Dense-Graded Aggregate Base

Favorable experience with dense-graded bases containing calcium chloride created interest in similar mixtures containing only water as a bonding agent. As a result of this interest, a project for base and surface construction was set up on the Phil-Pine Grove Road in Casey County to permit study of this method of base construction. The work was carried out during the period of August to October, 1953. The pavement, which is 11.62 mi. long, was constructed by contract. It had 2 in. of traffic-bound base (creek gravel) and appeared to be in rather uniform condition with few obviously weak areas. Courses constructed in this project were a 3-in. dense-graded base overlain by 1.5 in. of Class C-1 bituminous surface. Aggregate used in both courses consisted entirely of crushed limestone. An RT-2 prime of approximately 0.3 gal. per sq. yd. was applied to the dense- graded base prior to surfacing. The principle objectives of the project were; to determine the feasibility of using dense graded bases without additives, other than water; and to establish construction methods which avoid raveling or disintergration of the base prior to surfacing

Field Trip to Daviess and Henderson Counties for Inspection of Gravel-Bituminous Roads

This series of inspections started April 28, with inspection of pavements containing gravel located in Daviess County. It was found that most pavements containing this aggregate has been resurfaced last year using a crushed limestone aggregate. There were, however, three hot-mix and one road-mix pavements remaining