scholarly journals Cosmic-ray observations in 1964–65 with Mariner IV

1968 ◽  
Vol 46 (10) ◽  
pp. S976-S980 ◽  
Author(s):  
S. M. Krimigis
Keyword(s):  
Energy Range ◽  
Solar Minimum ◽  
Interplanetary Medium ◽  
Cosmic Ray ◽  
University Of Iowa ◽  
The University

The University of Iowa equipment on Mariner IV, which was launched towards Mars on 28 November 1964, consists in part of two thin-window G-M tubes sensitive to electrons of [Formula: see text] (detector B) and [Formula: see text] (detector A), and a shielded G-M tube (detector C) sensitive to electrons of Ee > 150 keV and having a threshold of ~55 MeV for omnidirectional protons. Observations over the period 28 November 1964 to 30 September 1965 have shown the following: (a) Electrons in the energy range [Formula: see text] were present in the interplanetary medium prior to day 12, 1965 with intensities of ~0.5 (cm2 s sr)−1. (b) The interplanetary cosmic-ray gradient for protons of [Formula: see text] was less than 3% per AU and the data are consistent with zero gradient. (c) There are large changes in the intensities of protons of [Formula: see text], but the direction and magnitude of the gradient for such protons were uncertain during solar minimum. The implications of these results are discussed.

Low-energy cosmic-ray heavy nuclei during the time of solar minimum

1968 ◽  
Vol 46 (10) ◽  
pp. S598-S600
Author(s):  
E. Tamai ◽  
M. Tsubomatsu ◽  
K. Ogura
Keyword(s):  
Energy Range ◽  
Solar Minimum ◽  
Cosmic Ray ◽  
Low Energy ◽  
Energy Spectra ◽  
Solar Modulation ◽  
Atmospheric Depth ◽  
Heavy Nuclei ◽  
Multiply Charged ◽  
Α Particles

Nuclear emulsions were exposed at 2.3 g cm−2 atmospheric depth over Fort Churchill in 1965. These emulsions have been examined for the tracks of multiply-charged [Formula: see text] nuclei, with emphasis being paid particularly to those particles that stopped in the emulsions. Differential energy spectra of α particles and [Formula: see text], [Formula: see text]and [Formula: see text] nuclei were obtained in the energy interval 60–550 MeV/nucleon. They represent experimental results during the period when solar modulation effects were at a minimum. The fluxes of α particles and L, M, and H nuclei for energy intervals of 60–170, 100–400, 100–525, and 140–550 MeV/nucleon were found to be 20.9 ± 1.2, 2.4 ± 0.4, 4.8 ± 0.6, and 2.5 ± 0.4 particles m−2 sr−1 s−1, respectively. The results also show that the L/M and H/M ratios at the top of the atmosphere were 0.56 ± 0.16 and 0.34 ± 0.13 respectively, in the energy range from 140 to 350 MeV/nucleon. These values are appreciably greater than those observed at higher energies.

Primary protons and alpha particles in the energy range 70–240 MeV/nucleon observed during 1966

1968 ◽  
Vol 46 (10) ◽  
pp. S900-S902
Author(s):  
G. D. Badhwar ◽  
C. L. Deney ◽  
B. R. Dennis ◽  
M. F. Kaplon
Keyword(s):  
Energy Range ◽  
Solar Minimum ◽  
Cosmic Ray ◽  
Alpha Particles ◽  
Energy Spectra ◽  
Modulation Function ◽  
Residual Material ◽  
Acceptance Range

The differential energy spectra of cosmic-ray protons and helium nuclei were measured on two balloon flights from Fort Churchill, Canada, during late July and early August of 1966. The measurements were made using a double dE/dx vs. E detector with an energy-independent (for stopping particles) acceptance aperture of 6 cm2 sr. The detector floated for a total of 25 hours under 2.7 g/cm2 of residual material. The acceptance range of energies is 70–240 MeV/nucleon for protons and 4He. Both the proton and 4He differential spectra are depressed from solar minimum and appear similar to 1963 results. The P/He ratio over the energy range is 4.3 ± 1. The spectra are compared to those obtained in 1965. It is found that the modulation function is proportional to either R or Rβ.

Cosmic-Ray Anisotropies as a Function of Time and Direction

1968 ◽  
Vol 1 (3) ◽  
pp. 114-115
Author(s):  
J.G. Ables
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Energy Range ◽  
Interplanetary Medium ◽  
Large Angle ◽  
Cosmic Ray ◽  
Angle Scattering ◽  
Large Angle Scattering ◽  
High Degree ◽  
Cosmic Ray Flux

The cosmic ray flux in the energy range 100 MeV/nucleon ≤ E ≤ 1 GeV/nucleon is remarkable for its high degree of isotropy. Observed deviations from isotropy seldom exceed a few per cent and are commonly much smaller. The mechanism responsible for this isotropy is presumed to be multiple, large-angle scattering of the charged cosmic ray particles by irregularities of the interplanetary magnetic field. While generally precluding any hope of discovering a source-related anisotropy of the flux in this energy range, it is just this strong interaction of the cosmic rays with the interplanetary medium that allows the study of the small observed anisotropies, both persistent and transient, to yield considerable information about the structure of the interplanetary medium (the solar wind and its entrapped magnetic field).

Cosmic-ray isotopic composition of C, N, O, Ne, Mg, SI nuclei in the energy range 50-200 MeV per nucleon measured by the Voyager spacecraft during the solar minimum period

1994 ◽  
Vol 426 ◽  
pp. 366 ◽  
Author(s):  
A. Lukasiak ◽  
P. Ferrando ◽  
F. B. McDonald ◽  
W. R. Webber
Keyword(s):  
Isotopic Composition ◽  
Energy Range ◽  
Solar Minimum ◽  
Cosmic Ray ◽  
Minimum Period

The consolidation of microscopy technology into a university research support facility: Reflections on the 1980's and projections for the 1990's at the university of iowa

1993 ◽  
Vol 51 ◽  
pp. 476-477
Author(s):  
Kenneth C. Moore
Keyword(s):  
Laser Scanning ◽  
Freeze Fracture ◽  
Freeze Substitution ◽  
Research Support ◽  
University Of Iowa ◽  
Staff Members ◽  
The Past ◽  
Research Grade ◽  
The University ◽  
Support Facility

The University of Iowa Central Electron Microscopy Research Facility(CEMRF) was established in 1981 to support all faculty, staff and students needing this technology. Initially the CEMRF was operated with one TEM, one SEM, three staff members and supported about 30 projects a year. During the past twelve years, the facility has replaced all instrumentation pre-dating 1981, and now includes 2 TEM's, 2 SEM's, 2 EDS systems, cryo-transfer specimen holders for both TEM and SEM, 2 parafin microtomes, 4 ultamicrotomes including cryoultramicrotomy, a Laser Scanning Confocal microscope, a research grade light microscope, an Ion Mill, film and print processing equipment, a rapid cryo-freezer, freeze substitution apparatus, a freeze-fracture/etching system, vacuum evaporators, sputter coaters, a plasma asher, and is currently evaluating scanning probe microscopes for acquisition. The facility presently consists of 10 staff members and supports over 150 projects annually from 44 departments in 5 Colleges and 10 industrial laboratories. One of the unique strengths of the CEMRF is that both Biomedical and Physical scientists use the facility.

Faculty evaluation at the University of Iowa

1977 ◽  
Vol 41 (6) ◽  
pp. 332-334
Author(s):  
NS Logan ◽  
R Muston
Keyword(s):  
Faculty Evaluation ◽  
University Of Iowa ◽  
The University

Five Decades of Research Experience in Speech Anatomy and Physiology

2016 ◽  
Vol 1 (5) ◽  
pp. 4-12
Author(s):  
David P. Kuehn
Keyword(s):  
Ohio State University ◽  
State University ◽  
Research Experience ◽  
University Of Iowa ◽  
University Of Illinois ◽  
Anatomy And Physiology ◽  
The Ohio State University ◽  
Speech Science ◽  
The University ◽  
East Carolina University

This report highlights some of the major developments in the area of speech anatomy and physiology drawing from the author's own research experience during his years at the University of Iowa and the University of Illinois. He has benefited greatly from mentors including Professors James Curtis, Kenneth Moll, and Hughlett Morris at the University of Iowa and Professor Paul Lauterbur at the University of Illinois. Many colleagues have contributed to the author's work, especially Professors Jerald Moon at the University of Iowa, Bradley Sutton at the University of Illinois, Jamie Perry at East Carolina University, and Youkyung Bae at the Ohio State University. The strength of these researchers and their students bodes well for future advances in knowledge in this important area of speech science.

Rheometers, Bioreactors, and Vocalization Forces: Using Basic Science Investigations to Help the Voices of Teachers

2008 ◽  
Vol 18 (3) ◽  
pp. 119-125
Author(s):  
Sarah Klemuk
Keyword(s):  
Basic Science ◽  
Tissue Growth ◽  
University Of Iowa ◽  
Support Cell ◽  
Rest Periods ◽  
Collaborative Studies ◽  
Professional Voice Users ◽  
The University ◽  
Science Investigations ◽  
Professional Voice

Abstract Collaborative studies at the University of Iowa and the National Center for Voice and Speech aim to help the voices of teachers. Investigators study how cells and tissues respond to vibration doses simulating typical vocalization patterns of teachers. A commercially manufactured instrument is uniquely modified to support cell and tissue growth, to subject tissues to vocalization-like forces, and to measure viscoelastic properties of tissues. Through this basic science approach, steps toward safety limits for vocalization and habilitating rest periods for professional voice users will be achieved.

The Kontakte Multimedia Project at The University of Iowa

2013 ◽  
Vol 17 (1) ◽  
pp. 25-42 ◽  
Author(s):  
James P. Pusack
Keyword(s):  
University Of Iowa ◽  
The University
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