SPECTRAL FUNCTION SUM RULES IN SU(3) × SU(3)

1967 ◽  
Vol 45 (12) ◽  
pp. 3901-3902 ◽  
Author(s):  
J. W. Moffat ◽  
P. J. O'Donnell
Keyword(s):  
Spectral Function ◽  
Sum Rules ◽  
The Other ◽  
Mass Ratio ◽  
Spectral Functions ◽  
Other Hand ◽  
Mass Ratios

Recently derived spectral function sum rules have been used to obtain mass ratios, assuming that the spectral functions are dominated by certain low-lying states. The strangeness-carrying resonance mass ratio is investigated and the predicted value is found to depend critically upon the ratio FK/Fπ. Using the experimental value FK/Fπ = 1.28 ± 0.02, it is found that [Formula: see text]. On the other hand, from the input value [Formula: see text] we get [Formula: see text].

XIV.—On Analysing the Physical Evolution of Galaxies

1960 ◽  
Vol 65 (3) ◽  
pp. 207-222
Author(s):  
V. C. Reddish
Keyword(s):  
Magellanic Clouds ◽  
The Other ◽  
Bright Star ◽  
Evolution Of Galaxies ◽  
Other Hand ◽  
Luminosity Functions ◽  
Mass Ratios ◽  
Set Up

SYNOPSISInvestigations based on gas masses, bright star counts, and luminosity-mass ratios of galaxies lead to one of two conclusions. If the galaxies are all of the same age, the faint ends of the initial luminosity functions of stars at formation differ greatly from one galaxy to another. On the other hand consistent results in the analysis are obtained with luminosity functions that are more nearly constant and ages which range from one to thirty thousand-million years. The various possibilities can be tested by observations on the Magellanic Clouds.Equations are set up which describe, as functions of time, the integrated properties of a galaxy as a system of stars and gas.

Spurious Structure from Approximations to the Dyson Equation

1972 ◽  
Vol 50 (19) ◽  
pp. 2286-2293 ◽  
Author(s):  
Clas Blomberg ◽  
Birger Bergersen
Keyword(s):  
Spectral Function ◽  
Spectral Properties ◽  
Perturbation Expansion ◽  
Dyson Equation ◽  
The Self ◽  
The Other ◽  
Exact Results ◽  
Electron Level ◽  
Self Energy ◽  
Other Hand

The method of calculating electron spectral properties by substituting perturbation theoretic results for the self-energy into the Dyson equation is investigated for a model of a deep electron level in which exact results are known. The method gives wrong results in the most important range and also predicts spurious structure. On the other hand, if a perturbation expansion is made directly for the spectral function after extracting the appropriate energy shifts no such difficulty arises.

scholarly journals Non conservative massive binary evolution (how much mass leaves the bnary during the evolution from OB+OB to WR+OB)

1981 ◽  
Vol 59 ◽  
pp. 461-463
Author(s):  
D. Vanbeveren
Keyword(s):  
Mass Loss ◽  
Roche Lobe ◽  
The Other ◽  
Mass Ratio ◽  
Other Hand ◽  
Binary Evolution

The observations give us on one hand the mass ratio (q) distribution of OB+OB type binaries in a stage prior to Roche lobe overflow (RLOF), and on the other hand the q distribution of WR binaries which are considered to be in a stage after RLOF. By comparing both distributions one may hope to be able to say something about the mass loss during RLOF.

scholarly journals A Search for Companions to L Dwarfs

2003 ◽  
Vol 211 ◽  
pp. 303-304
Author(s):  
P. R. Allen ◽  
D. W. Koerner ◽  
M. W. McElwain ◽  
G. R. Murphy ◽  
I. Neill Reid ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
The Other ◽  
Evolutionary Models ◽  
Mass Ratio ◽  
Upper Limits ◽  
Mass Ratios ◽  
L Dwarfs

We present the results of two imaging surveys for companions to low-luminosity dwarfs, one with Keck to a limiting magnitude of K = 20, and the other with HST to a limiting magnitude of I = 23. No companions were found at separations of 0″.5 to 20″.0, but seven companions were found within 0″.5. Based on sub-stellar evolutionary models, we estimate the companion detection efficiency as a function of mass ratio. This modeling, coupled with the data, place strong upper limits on the mass ratios of unobserved companions. We conclude that no companions exist in the optimal sensitivity regions of both surveys for q > 0.85 (HST), and q > 0.4 (Keck).

scholarly journals Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 × 10−4 Mass-ratio Planets

2022 ◽  
Vol 163 (2) ◽  
pp. 43
Author(s):  
Kyu-Ha Hwang ◽  
Weicheng Zang ◽  
Andrew Gould ◽  
Andrzej Udalski ◽  
Ian A. Bond ◽  
...  
Keyword(s):  
Light Curve ◽  
Light Curves ◽  
The Other ◽  
Mass Ratio ◽  
Mass Ratios ◽  
Prime Fields ◽  
Einstein Radius ◽  
Ratio Range

Abstract We apply the automated AnomalyFinder algorithm of Paper I to 2018–2019 light curves from the ≃13 deg2 covered by the six KMTNet prime fields, with cadences Γ ≥ 2 hr−1. We find a total of 11 planets with mass ratios q < 2 × 10−4, including 6 newly discovered planets, 1 planet that was reported in Paper I, and recovery of 4 previously discovered planets. One of the new planets, OGLE-2018-BLG-0977Lb, is in a planetary caustic event, while the other five (OGLE-2018-BLG-0506Lb, OGLE-2018-BLG-0516Lb, OGLE-2019-BLG-1492Lb, KMT-2019-BLG-0253, and KMT-2019-BLG-0953) are revealed by a “dip” in the light curve as the source crosses the host-planet axis on the opposite side of the planet. These subtle signals were missed in previous by-eye searches. The planet-host separations (scaled to the Einstein radius), s, and planet-host mass ratios, q, are, respectively, (s, q × 105) = (0.88, 4.1), (0.96 ± 0.10, 8.3), (0.94 ± 0.07, 13), (0.97 ± 0.07, 18), (0.97 ± 0.04, 4.1), and (0.74, 18), where the “ ± ” indicates a discrete degeneracy. The 11 planets are spread out over the range − 5 < log q < − 3.7 . Together with the two planets previously reported with q ∼ 10−5 from the 2018–2019 nonprime KMT fields, this result suggests that planets toward the bottom of this mass-ratio range may be more common than previously believed.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

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