Ultra-Low-Noise Measurements Using a Horn Reflector Antenna and a Traveling-Wave Maser

DeGrasse, R. W.; Hogg, David C.; Ohm, E. A.; Scovil, H. E. D.

doi:10.1063/1.1735108

Cited by 27 publications

(5 citation statements)

References 2 publications

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“…It is now also known that the discrepancy of 3.3 K between the measured and expected temperature of the Bell Labs horn antenna (for communicating with the Echo I satellite) at a wavelength of 12.5 cm found by Ohm (1961) is due to the CMB. Ohm also notes that an earlier measurement with this telescope (DeGrasse et al 1959) ascribes a temperature of 2 AE 1 K to back and side lobe pick up, that this is " temperature not otherwise accounted for," and that "it is somewhat larger than the calculated temperature expected." Of course, McKellar had the misfortune of performing his analyses well before Gamow and collaborators had laid the nucleosynthesis foundations that would eventually explain the CN measurements (and allow the CMB interpretation), and Ohm properly did not overly stress the discrepancy beyond its weak statistical significance.…”

Section: Theory and Observations Of The Cmbmentioning

confidence: 91%

The Beginning and Evolution of the Universe

Ratra

Vogeley

2008

PUBL ASTRON SOC PAC

100

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ABSTRACT. We review the current standard model for the evolution of the Universe from an early inflationary epoch to the complex hierarchy of structure seen today. We summarize and provide key references for the following topics: observations of the expanding Universe; the hot early Universe and nucleosynthesis; theory and observations of the cosmic microwave background; Big Bang cosmology; inflation; dark matter and dark energy; theory of structure formation; the cold dark matter model; galaxy formation; cosmological simulations; observations of galaxies, clusters, and quasars; statistical measures of large-scale structure; and measurement of cosmological parameters. We conclude with discussion of some open questions in cosmology. This review is designed to provide a graduate student or other new worker in the field an introduction to the cosmological literature.

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Section: Theory and Observations Of The Cmbmentioning

confidence: 91%

The Beginning and Evolution of the Universe

Ratra

Vogeley

2008

PUBL ASTRON SOC PAC

100

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“…With regards to microwave applications, G. P. Rodrigue 74 has showed that the ferrites are used in general in microwave devices. More precisely, they are used as signal amplitude limiters 75 and frequency multipliers 76 in microwave devices.…”

Section: Resultsmentioning

confidence: 99%

Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations

et al. 2018

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“…A half decade before Dicke's suggestion to Roll and Wilkinson, an experimental microwave receiving system at the Bell Telephone Laboratories detected more noise than expected from accounting of noise sources in the instrument (DeGrasse, Hogg, Ohm, and Scovil 1959). This curious result was repeatable (as Hogg 2009 recalled), but not widely discussed.…”

Section: The Sea Of Cosmic Microwave Radiationmentioning

confidence: 99%

“…6.13.2). Engineers were aware of the anomaly in 1959 (DeGrasse, Hogg, Ohm, and Scovil 1959). Five years later Penzias and Wilson had made a good case that the anomalous noise could not be instrumental or terrestrial.…”

Section: Prepared and Unprepared Mindsmentioning

confidence: 99%

Robert Dicke and the naissance of experimental gravity physics, 1957–1967

Peebles

2016

EPJ H

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The experimental study of gravity became much more active in the late 1950s, a change pronounced enough be termed the birth, or naissance, of experimental gravity physics. I present a review of developments in this subject since 1915, through the broad range of new approaches that commenced in the late 1950s, and up to the transition of experimental gravity physics to what might be termed a normal and accepted part of physical science in the late 1960s. This review shows the importance of advances in technology, here as in all branches of natural science. The role of contingency is illustrated by Robert Dicke's decision in the mid-1950s to change directions in mid-career, to lead a research group dedicated to the experimental study of gravity. The review also shows the power of nonempirical evidence. Some in the 1950s felt that general relativity theory is so logically sound as to be scarcely worth the testing. But Dicke and others argued that a poorly tested theory is only that, and that other nonempirical arguments, based on Mach's Principle and Dirac's Large Numbers hypothesis, suggested it would be worth looking for a better theory of gravity. I conclude by offering lessons from this history, some peculiar to the study of gravity physics during the naissance, some of more general relevance. The central lesson, which is familiar but not always well advertised, is that physical theories can be empirically established, sometimes with surprising results.

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Ultra-Low-Noise Measurements Using a Horn Reflector Antenna and a Traveling-Wave Maser

Cited by 27 publications

References 2 publications

The Beginning and Evolution of the Universe

The Beginning and Evolution of the Universe

Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations

Robert Dicke and the naissance of experimental gravity physics, 1957–1967

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