Research in the development effort of an improved multiplier phototube final report

Single electron counting characteristics of multiplier phototubes - Pulse height distribution of windowless multiplie

A new species of Acmaeodera (Coleoptera: Buprestidae) from Big Bend National Park, Texas : with synonymy for other species occurring in the United States

Acmaeodera tiquilia Westcott and Barr, new species, from Big Bend National Park, Texas is described, figured, and discussed in considerable detail, particularly in relation to the similar and partially sympatric A. recticollis Fall. A neotype is designated for A. quatuordecimspilota Obenberger and that species is synonymized with A. ornata (Fabricius). Additionally, A. gibbula gila Knull is synonymized with A. gibbula LeConte; A. nautica Van Dyke is synonymized with A. simulata Van Dyke

Research in the development effort of an improved multiplier phototube Seventh quarterly report

Test data on effective photocathode size, response uniformity, and pulse amplitude distribution of multiplier phototube

Slip casting and extruding shapes of rhenium with metal oxide additives. 1: Feasibility demonstration

The feasibility of fabricating small rhenium parts with metal oxide additives by means of slip casting and extrusion techniques is described. The metal oxides, ZrO2 and HfO2 were stabilized into the cubic phase with Y2O3. Additions of metal oxide to the rhenium of up to 15 weight percent were used. Tubes of 17 mm diameter with 0.5 mm walls were slip cast by adapting current ceramic oxide techniques. A complete cast double conical nozzle demonstrated the ability to meet shapes and tolerances. Extrusion of meter long tubing lengths of 3.9 mm o.d. x 2.3 mm i.d. final dimension is documented. Sintering schedules are presented to produce better than 95% of theoretical density parts. Finished machining was found possible were requried by electric discharge machining and diamond grinding

Research in the development of an improved multiplier phototube Final report

Cascade aperture design, gas pressure effects, gain calibration, and photon counting efficiency of multiplier phototub

New Solutions to the Strong CP Problem

We exhibit a solution to the strong CP problem in which ultraviolet physics renders the QCD theta angle physically unobservable. Our models involve new strong interactions beyond QCD and particles charged under both the new interactions and ordinary color.Comment: RevTex, 2-columns, 5 pages, 1 fig. Revised version, including additional discussion of the UV theory and the low-energy effective theory, to appear in Physics Letters

The anthropic principle and the mass scale of the Standard Model

In theories in which different regions of the universe can have different values of the the physical parameters, we would naturally find ourselves in a region which has parameters favorable for life. We explore the range of anthropically allowed values of the mass parameter in the Higgs potential, $\mu^2$. For $\mu^2<0$, the requirement that complex elements be formed suggests that the Higgs vacuum expectation value $v$ must have a magnitude less than 5 times its observed value. For $\mu^2>0$, baryon stability requires that $|\mu|<<M_P$, the Planck Mass. Smaller values of $|\mu^2|$ may or may not be allowed depending on issues of element synthesis and stellar evolution. We conclude that the observed value of $\mu^2$ is reasonably typical of the anthropically allowed range, and that anthropic arguments provide a plausible explanation for the closeness of the QCD scale and the weak scale.Comment: 28 pages, LaTeX. No changes from version originally submitted to archive, except that problem with figure file has been correcte