Current Performance of the SLD VXD3

During 1996, the SLD collaboration completed construction and began operation of a new charge-coupled device (CCD) vertex detector (VXD3). Since then, its performance has been studied in detail and a new topological vertexing technique has been developed. In this paper, we discuss the design of VXD3, procedures for aligning it, and the tracking and vertexing improvements that have led to its world-record performance.Comment: 17 pages latex including 10 figures, to appear in Proceedings Vertex99 Worksho

HIGGS BOSON PRODUCTION IN e+e−→μ+μ−bbˉe^+ e^- \to \mu^+ \mu^- b \bar b

The production of the Standard Model Higgs boson in the four-fermion reaction $e^+ e^- \to \mu^+ \mu^- b \bar b$ is studied. The complete tree-level matrix element, including signal and backgrounds in the standard electroweak theory, is computed and initial state radiation is taken into account in the leading-log approximation. A Monte Carlo event generator has been built and numerical results for some distributions of experimental interest for the search of the Higgs particle at future electron-positron colliders are shown, compared with those existing in the literature and commented.Comment: 8 pages, 5 figures available via anonymous ftp at: ftp://cobra1.pv.infn.it/pub/4f/, files fig#h.ps with #=1,...,5

Impact of Alteration Phase Formation and Microbial Activity on the Fate and Transport of the Actinides and Fission Products: Alteration Phase Analysis

The study of the behavior and movement of radionuclides in the environment is significant to many projects of interest to Southern Nevada, especially for the proposed Yucca Mountain Repository, as well as to the nation-wide issues of radiological releases from a variety of scenarios. Understanding and predicting the release, transport, and fate of radionuclides, particularly the actinide elements, in the Mojave/Great Basin geology is an extremely challenging, multi-faceted problem. In support of the national program to deepen our understanding of the behavior of radionuclides in the environment and to better predict the performance of a geological repository at Yucca Mountain, researchers at UNLV, under a cooperative agreement between and UNLV Research Foundation and the U.S. Department of Energy (#DE-FC28-04RW12237), will examine two key fate and transport issues: the potential impact of microorganisms and the impact of the formation of alteration phases due to the corrosion of the waste package and waste forms on the chemistry, fate, and transport of radionuclides released from the site. Task ORD-RF-01 (SIP-UNLV-046) is focused on the influence of microorganisms. Task ORD-RF-02 (SIP-UNLV-045) involves surface complexation and solid dissolution studies. This task, titled Impact of Alteration Phase Formation and Microbial Activity on the Fate and Transport of the Actinides and Fission Products: Alteration Phase Analysis, entails method development and elemental characterization of select alteration phases generated in Task ORD-RF-02. All of this work is subject to QARD and University and Community College System of Nevada (UCCSN) Quality Assurance (QA) Program requirement

Can the last glacial maximum constrain climate sensitivity?

We investigate the relationship between the Last Glacial Maximum (LGM) and climate sensitivity across the PMIP2 multi-model ensemble of GCMs, and find a correlation between tropical temperature and climate sensitivity which is statistically significant and physically plausible. We use this relationship, together with the LGM temperature reconstruction of Annan and Hargreaves [2012], to generate estimates for the equilibrium climate sensitivity. We estimate the equilibrium climate sensitivity to be about 2.5C with a high probability of being under 4C, though these results are subject to several important caveats. The forthcoming PMIP3/CMIP5 models were not considered in this analysis, as very few LGM simulations are currently available from these models. We propose that these models will provide a useful validation of the correlation presented here

Wind-tunnel interference with particular reference to off-center positions of the wing and to the downwash at the tail

The theory of wind tunnel boundary influence on the downwash from a wing has been extended to provide more complete corrections for application to airplane test data. The first section of the report gives the corrections of the lifting line for wing positions above or below the tunnel center line; the second section shows the manner in which the induced boundary influence changes with distance aft of the lifting line. Values of the boundary corrections are given for off-center positions of the wing in circular, square, 2:1 rectangular, and 2:1 elliptical tunnels. Aft of the wing the corrections are presented for only the square and the 2:1 rectangular tunnels, but it is believed that these may be applied to jets of circular and 2:1 elliptical cross sections. In all cases results are included for both open and closed tunnels

Can a Measurement of the Bs−B‾sB_{s} - {\overline{B}}_{s} Mass Difference Establish the CKM Paradigm?

We present a reanalysis of the allowed region in the $\rho - \eta \,$ plane of the CKM matrix, which follows from our present knowledge of the theoretical and experimental parameters associated with quark mixing and CP violation. Besides providing updated expectations for the angles of the unitarity triangle, this reanalysis predicts a range of allowed values for the $B_{s} - {\overline{B}}_{s} \,$ mass difference $\Delta m_{s}$. We argue that while values of \Delta m_{s} \lsim 10 (ps)^{-1} could be consistent with a non-CKM origin for CP violation in the neutral Kaon system, larger values for $\Delta m_{s}$ would provide strong support for the CKM paradigm.Comment: 9 pages, LaTex, 3 uuencoded eps figures(embedded with epsfig.sty)

Sudakov Logarithm Resummation in Transverse Momentum Space for Electroweak Boson Production at Hadron Colliders

A complete description of W and Z boson production at high-energy hadron colliders requires the resummation of large Sudakov double logarithms which dominate the transverse momentum (q_T) distribution at small q_T. We compare different prescriptions for performing this resummation, in particular implicit impact parameter space resummation versus explicit transverse momentum space resummation. We argue that the latter method can be formulated so as to retain the advantages of the former, while at the same time allowing a smooth transition to finite order dominance at high q_T.Comment: 32 pages, Latex, epsfig, 17 figure

Fluorescence assay of glucosylceramide glucosidase using NBD‐Cerebroside

A sensitive fluorometric assay for glucocerebroside β‐glucosidase [Dinur, T., Grabowski, G.A., Desnick, R.J., and Gatt, S. (1984)Anal. Biochem. 136, 223–234] has been reexamined. It was found that the lipids containing the NBD moiety (12‐[N‐methyl‐N‐(7‐nitrobenz‐2‐oxa‐1,3‐diazol‐4‐yl)] used for standardization of the assay are light‐sensitive and that the yield of fluorescent light is very sensitive to the composition of the solvent used in the fluorometric measurement. Some protection against fading could be obtained by adding a free‐radical trapping agent, Slow Fade. The fading of the free NBD‐acid, when used for standardization, could be prevented by adding ethanol to the solvent, but this reduced the fluorescence yield. It is recommended that some of the fluorescent substrate be enzymatically hydrolyzed completely to NBD‐ceramide, which can be utilized as the standard without the need to add ethanol. A warning about enzyme reaction rate stability with time is given, with a suggestion for ensuring constancy of activity.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141148/1/lipd1052.pd

The Ursinus Weekly, October 26, 1936

Ursinus amateur, says J.R. Tunis • Fighting grizzlies beat Muhlenberg • Curtain Club tryouts attract large number of students • Sophomore class chooses U ring; Dunn head of committee • The Human Adventure, eight-reel picture reviewing ages of man\u27s past, shown four times to accommodate crowds; Dr. White directs presentation • Hedgerow noted for its Twelfth night rendition • Varsity Club to sponsor annual dance November 7 • Y hobo Halloween party to feature fun for all • Goldberg chosen to head male commuters in recent election • Frosh beat Perkiomen in hard fought game as Kurek, McConnel stage down-field drive • McAvoy\u27s bears to tangle with Albright Lions on Saturday • Bear booters trounced as teachers storm bruin goal • Hockeyites bow to Swarthmore in hard tilt; come back to shatter Beaver\u27s winning streak • Tennis tournament reaches quarter-finals; ends Sunday • Juniors are victorious in inter-class hockey games • Brodbeck leads in dorm football; tie for secondhttps://digitalcommons.ursinus.edu/weekly/1909/thumbnail.jp