Physical Sciences and Mathematics Commons^™

Radial Dependence Of The Nucleon Effective Mass In 10b, L J. De Bever, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson

Gerald Alvin Peterson

The dynamic properties of the atomic nucleus depend strongly on correlations between the nucleons. We present a combined analysis of inelastic electron-scattering data and electron-induced proton knockout measurements in an effort to obtain phenomenological information on nucleon-nucleon correlations. Our results indicate that the ratio of radial wave functions extracted from precise 10B(e,e′) and 10B(e,e′p) measurements evolve from an interior depression for small Em, characteristic of short-range correlations, to a surface-peaked enhancement for larger Em, characteristic of long-range correlations. This observation can be interpreted in terms of the nucleon effective mass.

29. Motowo Takayanagi, Otto Vogl, Tisoro Kajiyama

Emeritus Faculty Author Gallery

No abstract provided.

29. Motowo Takayanagi, Otto Vogl, Tisoro Kajiyama

Otto Vogl

No abstract provided.

Annual And Daily Meteorological Cycles At High Altitude On A Tropical Mountain, Douglas R. Hardy, Mathias Vuille, Carsten Braun, Frank Keimig, Raymond S. Bradley

Raymond S Bradley

An automated weather station was installed in October 1996 at the summit of Nevado Sajama, located in the western Andean Cordillera of Bolivia (6542 m, 18°06¢S, 68°53¢W). Meteorological conditions on the mountain are being observed to improve the calibration of geochemical variations within tropical ice cores. This article documents the design and operation of the station and presents a discussion of measurements made through the first annual cycle. Variables analyzed include pressure, incoming solar radiation, air temperature, humidity, wind, and snow accumulation. Large diurnal fluctuations were recorded in most variables, which is not unexpected given the location at 18°S; the …

A Note On The Symplectic Structure On The Space Of G-Monopoles, Michael Finkelberg, Alexander Kuznetsov, Nikita Markarian, Ivan Mirkoviæ

Mathematics and Statistics Department Faculty Publication Series

No abstract provided.

Rank 2 Integrable Systems Of Prym Varieties, J. C. Hurtubise, E. Markman

Mathematics and Statistics Department Faculty Publication Series

No abstract provided.

Brownian Motion And Polymer Statistics On Certain Curved Manifolds, Radu P. Mondescu, M. Muthukumar

Physics Department Faculty Publication Series

No abstract provided.

30. Manfred Raetzsch, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

30. Manfred Raetzsch, Otto Vogl

Otto Vogl

No abstract provided.

Semiinfinite Flags. I. Case Of Global Curve P^1., Michael Finkelberg, Ivan Mirkoviæ

Mathematics and Statistics Department Faculty Publication Series

No abstract provided.

31. Yoshio Iwakura, Otto Vogl, Seiichi Nakahama

Emeritus Faculty Author Gallery

No abstract provided.

31. Yoshio Iwakura, Otto Vogl, Seiichi Nakahama

Otto Vogl

No abstract provided.

Redshifted Neutral Hydrogen 21 Centimeter Absorption Toward Red Quasars, C L. Carilli, Karl M. Menten, Mark J. Reid, M P. Rupen, Min S. Yun

Min S. Yun

We have searched for redshifted neutral hydrogen 21 cm absorption toward sources from the Stickel et al. "red quasar" subsample. The red quasar subsample is taken from the 1 Jy sample of flat-spectrum radio sources and is comprised of the 15 sources that are undetected on the POSS. Five of these red quasars have been searched for redshifted H I 21 cm absorption to optical depth levels of a few percent, and four show strong absorption, with neutral hydrogen column densities between 4 and 80 × 1018 × (Ts/f) cm-2. This 80% success rate for the red quasars compares to …

32. Ian Macmillan Ward, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

32. Ian Macmillan Ward, Otto Vogl

Otto Vogl

No abstract provided.

Cosmopolitan Distribution Of The Large Composite Microbial Mat Spirochete, Spirosymplokos Deltaeiberi, Lynn Margulis, Antoni Navarrete, Mónica Solé

Lynn Margulis (1938 - 2011)

Inocula from organic-rich black muds immediately underlying intertidal laminated microbial mats dominated by Microcoleus chthonoplastes yielded large, variable diameter spirochetes. These unusual spirochetes, previously reported only from the Alfacs Peninsula at the delta of the Ebro river in northeast Spain, contain striking arrays of cytoplasmic granules packed into their protoplasmic cylinders. On several occasions, both in summer and winter, the huge spirochetes were recognized in samples from mats growing in the Sippewissett salt marsh at Woods Hole Massachusetts. They were also seen in similar samples from microbial mats at North Pond, Laguna Figueroa, Baja California Norte, Mexico. The identity of …

Molecular Gas In The Inner 100 Parces Of M51, N Z. Scoville, Min S. Yun, L Armus, H Ford

Min S. Yun

We report imaging of CO (2-1) emission in the nucleus of M51 at 1'' (47 pc) resolution. Molecular gas is found closely associated with the nuclear radio jet and the X-shaped dust absorption feature seen in the Hubble Space Telescope images. The CO emission lies along the side of the nuclear radio continuum "jet." The strongest molecular emission is not symmetric in either position or velocity with respect to the nucleus—the dominant feature is at redshifted velocities and peaks 1'' to the west of the radio/optical nucleus. The CO (2-1) emission has an integrated flux implying a molecular gas mass …

33. Noburo Yamazaki, Otto Vogl, Seiichi Nakahama

Emeritus Faculty Author Gallery

No abstract provided.

A Build-Out Study Of The Mid-Connecticut Valley Of Massachusetts, Center For Economic Development

Center for Economic Development Technical Reports

This is a study of growth potential in seven towns located along an east-west axis in the mid Connecticut River Valley in western Massachusetts. It employs a planning method commonly described as a build-out analysis in which lands are identified that are both physically suitable and available for future development. Zoning regulations, population growth projections, land conservation trends, and other constraints are then used to project different growth scenarios that result in estimations of the number of new residences that can be accommodated over time and the increases in population that would be likely based on those. The results of …

Economic Sustainability Plan For Adams, Massachusetts: Ten Year Projection Plan, Center For Economic Development

Center for Economic Development Technical Reports

The client for this project is James Leitch, The town administrator for the Town of Adams. In addition, we are working in close conjunction with the Center for Economic Technology (C.E.T.).

The purpose of this project is to assist Adams in the creation of a ten year economic action plan, which is only one-third of Adams proposed Comprehensive Sustainability Plan. The Comprehensive Plan is to be completed by the merger of three plans: the 1997 University of Massachusetts Landscape Architecture Studio Report on environmental elements within the Town, our 1998 Economic Action Plan, and a Social Plan, to be developed …

Determination Of Chloride By Flow Injection Spectrophotometry With Membrane Reagent Introduction, Sj Chalk, Jf Tyson

Chemistry Department Faculty Publication Series

No abstract provided.

Flow Injection Determination Of Selenium By Successive Retention Of Se(Iv) And Tetrahydroborate(Iii) On An Anion-Exchange Resin And Hydride Generation Electrothermal Atomization Atomic Absorption Spectrometry With In-Atomizer Trapping - Part 1. Method Development And Investigation Of Interferences, Pe Carrero, Jf Tyson

Chemistry Department Faculty Publication Series

No abstract provided.

Effect Of Sample Volume On The Limit Of Detection In Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry, Jf Tyson, Ri Ellis, Sa Mcintosh, Cp Hanna

Chemistry Department Faculty Publication Series

No abstract provided.

Flow Injection Manifold For Matrix Removal In Inductively Coupled Plasma Mass Spectrometry By Solid Phase Extraction: Determination Of Al, Be, Li And Mg In A Uranium Matrix, P Becotte-Haigh, Jf Tyson, E Denoyer

Chemistry Department Faculty Publication Series

No abstract provided.

Reduction Of Water Loading Effects In Inductively Coupled Plasma Mass Spectrometry By A Nafion Membrane Dryer Device, N Fitzgerald, Jf Tyson, Da Leighty

Chemistry Department Faculty Publication Series

No abstract provided.

The Search For Anticarcinogenic Organoselenium Compounds From Natural Sources, Eric Block, Susan Bird, Julian Tyson, Peter C. Uden, Xing Zhang, Eric R. Denoyer

Chemistry Department Faculty Publication Series

Consumption of Se-enriched plants or yeast-based nutritional supplements is reported to reduce the risk of cancer. Separation and identification of natural organoselenium compounds in these plants is essential to understand the basis for their biological activity. Earlier work suggests that plants convert inorganic selenium in the soil or growth medium into organoselenium compounds, such as selenoamino acids, following a route similar to the sulfur assimilatory pathway. To separate and detect selenoamino acids in plant extracts, we employ ion pair LC with an inductively coupled plasma mass spectrometer (ICP-MS) detector and capillary GC with an atomic emission detector (AED), for underivatized …

Can Nearby Resonances Enhance D-0-(D)Over-Bar(0) Mixing?, E Golowich, Aa Petrov

Physics Department Faculty Publication Series

We study the contributions of resonances to mixing. Both and hybrid states are considered. Assuming reasonable values for the resonance parameters, we find relatively sizeable individual contributions to both ΔmD and ΔΓD. We derive a variant of the GIM cancellation mechanism for the resonance amplitudes and show that broken SU(3) can allow for appreciable residual effects. Additional input from meson spectroscopy and lattice gauge simulations will be needed to improve the accuracy of these predictions.

The Dmo Sum Rule Revisited, E Golowich, J Kambor

Physics Department Faculty Publication Series

We reconsider the DMO sum rule in light of our recent two-loop calculations of isospin and hypercharge vector and axialvector current propagators in chiral perturbation theory. A modified derivation valid to second order in the light quark masses is presented, and a phenomenological analysis yields determination of a combination of finite counterterms occurring in the p4 and p6 chiral lagrangians. Suggestions are given for further study.

Exact, Complete, And Universal Continuous-Time Worldline Monte Carlo Approach To The Statistics Of Discrete Quantum Systems, Nikolai Prokof'ev, Boris Svistunov, Tupitsyn

Physics Department Faculty Publication Series

We show how the worldline quantum Monte Carlo procedure, which usually relies on an artificial time discretization, can be formulated directly in continuous time, rendering the scheme exact. For an arbitrary system with discrete Hilbert space, none of the configuration update procedures contain small parameters. We find that the most effective update strategy involves the motion of worldline discontinuities (both in space and time), i.e., the evaluation of the Green’s function. Being based on local updates only, our method nevertheless allows one to work with the grand canonical ensemble and nonzero winding numbers, and to calculate any dynamical correlation function …

U Duality, D-Branes, And Black Hole Emission Rates: Agreements And Disagreements, F Dowker, David Kastor, Jennie Traschen

Physics Department Faculty Publication Series

An expression for the spacetime absorption coefficient of a scalar field in a five-dimensional, near-extremal black hole background is derived, which has the same form as that presented by Maldacena and Strominger, but is valid over a larger, U-duality invariant region of parameter space and in general disagrees with the corresponding D-brane result. We develop an argument, based on D-brane thermodynamics, which specifies the range of parameters over which agreement should be expected. For neutral emission, the spacetime and D-brane results agree over this range. However, for charged emission, we find disagreement in the “fat black hole” regime, in which …