Description of data plots from the University of Minnesota ion chamber and electron spectrometer on OGO-1 and OGO-3

Data plots obtained from ion chamber and electron spectrometer experiments aboard OGO A and OGO C satellite

First Results from the Transit Ephemeris Refinement and Monitoring Survey (TERMS)

Transiting planet discoveries have yielded a plethora of information towards understanding the structure and atmospheres of extra-solar planets. These discoveries have been restricted to the short-period or low-periastron distance regimes due to the bias inherent in the geometric transit probability. Through the refinement of planetary orbital parmaters, and hence reducing the size of transit windows, long-period planets become feasible targets for photometric follow-up. Here we describe the TERMS project which is monitoring these host stars at predicted transit times

Quantum Hall line junction with impurities as a multi-slit Luttinger liquid interferometer

We report on quantum interference between a pair of counterpropagating quantum Hall edge states that are separated by a high quality tunnel barrier. Observed Aharonov-Bohm oscillations are analyzed in terms of resonant tunneling between coupled Luttinger liquids that creates bound electronic states between pairs of tunnel centers that act like interference slits. We place a lower bound in the range of 20-40 $\mu$m for the phase coherence length and directly confirm the extended phase coherence of quantum Hall edge states.Comment: 4 pages, 3 figures, 1 tabl

Stereoscopic observations of hard x ray sources in solar flares made with GRO and other spacecraft

Since the launch of the Gamma Ray Observatory (GRO) in Apr. 1991, the Burst and Transient Source Experiment (BATSE) instrument on GRO has recorded a large number of solar flares. Some of these flares have also been observed by the Gamma-Ray Burst Detector on the Pioneer Venus Orbiter (PVO) and/or by the Solar X-Ray/Cosmic Gamma-Ray Burst Experiment on the Ulysses spacecraft. A preliminary list of common flares observed during the period May-Jun. 1991 is presented and the possible joint studies are indicated

I-Gel and Classic LMA - a Comparitive Study in Anaesthetized and Paralyzed Patients

This study was undertaken in 50 ASA 1 and 2 patients of age group 18 to 60 years undergoing elective surgeries of short duration. Patients were randomly divided into 2 groups of 25 each for i-gel and classic LMA. Parameters assessed were - ease of insertion of airway device i.e. no. of attempts required and time taken for effective airway establishment (TFEA), ease of gastric tube placement, gastric insufflation and regurgitation (by comparing pH of the secretions on the dorsal surface of both the devices with sensitive litmus paper), hemodynamic response to insertion of device and post-operative sore throat following general anaesthesia. Incidents like desaturation, laryngospasm, bronchospasm, gastric insufflations were noted. The mode of induction, maintenance and reversal of general anaesthesia remained the same for both the groups. Demographic data between the two groups i.e. age, weight, sex, duration of surgery was comparable and with no statistical difference between them. There was one incidence of failure of insertion with Classic LMA to achieve effective airway. Success rate of device insertion was higher for i-gel than classic LMA and was statistically significant. Mean attempt for i-gel was 1.12 (S.D 0.332), classic LMA 1.45 (S.D 0.588). Time required for effective airway establishment was shorter with i-gel 20.24 seconds (S.D 22.408) than classic LMA 52.458 (S.D 41.341) and was statistically significant P < 0.05. There were no statistical and clinical differences in hemodynamic responses to insertion of both the devices. After removal at the end of surgery blood was visible on cuffs of 3 Classic LMAs but not on any of the i-gels. No statistical difference was found in pH of the cuffs of both the devices after removal. Incidence of post-operative sore throat was more with classic LMA (mean rank 31.25) than i-gel (mean rank 19) and was statistically significant P < 0.05. To conclude i-gel is easier to insert than Classic LMA and also facilitates gastric tube placement. i-gel is appropriate device for airway management as an alternative or backup device to Classic LMA. i-gel is less traumatic to airway than Classic LMA and correctly positioned i-gel isolates glottis from upper esophagus and provides airway protection

A Millikelvin Scanned Probe for Measurement of Nanostructures

We demonstrate a scanning force microscope, based upon a quartz tuning fork, that operates below 100 mK and in magnetic fields up to 6 T. The microscope has a conducting tip for electrical probing of nanostructures of interest, and it incorporates a low noise cryogenic amplifier to measure both the vibrations of the tuning fork and the electrical signals from the nanostructures. At millikelvin temperatures the imaging resolution is below 1 um in a 22 um x 22 um range, and a coarse motion provides translations of a few mm. This scanned probe is useful for high bandwidth measurement of many high impedance nanostructures on a single sample. We show data locating an SET within an array and measure its coulomb blockade with a sensitivity of 2.6 x 10^-5 e/Hz^1/2.Comment: 5 pages, 5 figures, submitted to RS

Do About Half the Top Quarks at FNAL Come From Gluino Decays?

We argue that it is possible to make a consistent picture of FNAL data including the production and decay of gluinos and squarks. The additional cross section is several pb, about the size of that for Standard Model (SM) top quark pair production. If the stop squark mass is small enough, about half of the top quarks decay to stop squarks, and the loss of SM top quark pair production rate is compensated by the supersymmetric processes. This behavior is consistent with the reported top quark decay rates in various modes and other aspects of the data, and suggests several other possible decay signatures. This picture can be tested easily with more data, perhaps even with the data in hand, and demonstrates the potential power of a hadron collider to determine supersymmetric parameters. It also has implications for the top mass measurement and the interpretation of the LEP $R_b$ excess.Comment: 18 pages, including 4 Postscript figures, uses epsf.tex, also available at http://www.hep.anl.gov/theory/mrenna

Analysis of heavy spin--3/2 baryon--heavy spin--1/2 baryon--light vector meson vertices in QCD

The heavy spin--3/2 baryon--heavy spin--1/2 baryon vertices with light vector mesons are studied within the light cone QCD sum rules method. These vertices are parametrized in terms of three coupling constants. These couplings are calculated for all possible transitions. It is shown that correlation functions for these transitions are described by only one invariant function for every Lorenz structure. The obtained relations between the correlation functions of the different transitions are structure independent while explicit expressions of invariant functions depend on the Lorenz structure.Comment: 17 Pages, 6 Figures and 4 Table

Resonant Tunneling Between Quantum Hall Edge States

Resonant tunneling between fractional quantum Hall edge states is studied in the Luttinger liquid picture. For the Laughlin parent states, the resonance line shape is a universal function whose width scales to zero at zero temperature. Extensive quantum Monte Carlo simulations are presented for $\nu = 1/3$ which confirm this picture and provide a parameter-free prediction for the line shape.Comment: 14 pages , revtex , IUCM93-00