Search for Light Variations of HD 101065

1977 ◽  
Vol 3 (2) ◽  
pp. 143-144 ◽  
Author(s):  
A. Przybylski
Keyword(s):  
Rare Earths ◽  
Effective Temperature ◽  
Critical Examination ◽  
Iron Group ◽  
Peculiar Star ◽  
Positive Identification ◽  
The Subject

The eighth magnitude star HD 101065 is an extremely peculiar star with a unique spectrum characterized by numerous strong lines of the rare earths and the absence, or at least a remarkable weakening, of the lines of the iron group (Cowley et al. 1977). Besides the lanthanides only yttrium, zirconium, calcium and barium are definitely present in the atmosphere in substantial quantities. The evidence for the presence of lithium and strontium is subject to some doubt since these elements are represented only by one or two reasonably strong lines, which is insufficient for a positive identification in a spectrum as complex as that of HD 101065. The evidence for the presence of other elements is the subject of a critical examination in a recent paper by Cowley et al. (1977). The effective temperature of the star is about 6100 K (Przybylski, 1977) which is substantially lower than the temperature of any known Ap star. However, the effective temperature of HD 101065 is still subject to controversy (Wegner, 1976).

Hd 101065 - An Astronomical Enigma

1976 ◽  
Vol 32 ◽  
pp. 351-355
Author(s):  
A. Przybylski
Keyword(s):  
Rare Earths ◽  
Effective Temperature ◽  
Peculiar Star ◽  
Testing Ground ◽  
Ap Stars

SummaryHD 101065 is a very peculiar star whose spectrum is dominated entirely by the numerous lines of the rare earths. The only other metals seen in the spectrum are strontium, yttrium, zirconium and barium and traces of calcium.The effective temperature of the star is 6075° ± 200°K or about 1000°K lower than that of the coolest Ap stars known to date.HD 101065 is a suitable testing ground for the theories on the formation of Ap stars. The absence of “normal” elements in the atmosphere of the star puts stringent limitations on the choice of the available theories.

Methodology for the design of a standard research protocol for measuring terminology usage

Terminology ◽  
2003 ◽  
Vol 9 (1) ◽  
pp. 29-49 ◽  
Author(s):  
Jean Quirion
Keyword(s):  
Sampling Methods ◽  
Critical Examination ◽  
Research Protocol ◽  
Statistical Sampling ◽  
Measurement Protocol ◽  
The Future ◽  
The Subject ◽  
Made In

Many states have undertaken language and terminology planning programmes and have reached the point where they must evaluate the progress realized up to the present time. In the case of terminology planning programmes, such an evaluation requires a method to measure the degree to which the terminology has been implanted. In this paper, a research protocol for measuring terminology implantation is presented; this protocol is based on institutional communications. First, a critical examination of prior research on the subject is made in order to identify the desired characteristics of a precise, scientific measurement protocol. It is an accepted postulate that the constitution of a representative corpus forms the basis of a solution. Statistical sampling methods have been adapted in order to design a measurement protocol that respects the above conditions. The paper concludes with an overview of the results of a terminology implantation survey carried out using the research protocol presented; the survey concerns transportation terminology. This overview is followed by a brief discussion of the future possibilities offered by the scientific measurement of terminology implantation.

The Conquest That Never Was: Ghana and the Almoravids, 1076. II. The Local Oral Sources

1983 ◽  
Vol 10 ◽  
pp. 53-78 ◽  
Author(s):  
David C. Conrad ◽  
Humphrey J. Fisher
Keyword(s):  
Time Scale ◽  
Oral Tradition ◽  
Eleventh Century ◽  
The Other ◽  
Oral Traditions ◽  
Positive Identification ◽  
The Subject ◽  
Oral Evidence ◽  
Remote Past ◽  
Written Sources

“The land took the name of the wells, the wells that had no bottom.”In Part I of this paper we examined the external written sources and found no unambiguous evidence that an Almoravid conquest of ancient Ghana ever occurred. The local oral evidence reviewed in this part of our study supports our earlier hypothesis, in that we find nothing in the traditions to indicate any conquest of the eleventh-century sahelian state known to Arab geographers as “Ghana.” Instead, the oral traditions emphasize drought as having had much to do with the eventual disintegration of the Soninke state known locally as “Wagadu.”An immediate problem involved in sifting the oral sources for evidence of an Almoravid conquest is that a positive identification between the Wagadu of oral tradition and the Ghana of written sources has never been established. Early observers like Tautain (1887) entertained no doubts in this regard, and recently Meillassoux seems to have accepted a connection, if not an identification, between Ghana and Wagadu when he notes that “les Wago, dont le nom a donné Wagadu, sont les plus clairement associés à l'histoire du Ghana.” However, much continues to be written on the subject, and the question remains a thorny one. On the lips of griots (traditional bards) and other local informants, Wagadu is a timeless concept, so a reliable temporal connection between people and events in the oral sources on one hand and Ghana at the time of the Almoravids on the other, is particularly elusive. Indeed, any link between the traditions discussed here and a specific date like 1076 must be regarded as very tenuous, as must any association of legendary events with Islamic dates. In western Sudanic tradition influenced by Islam, the hijra (A.D. 622) is both prestigious and convenient, a date with which virtually any event in the remote past can be associated, though such a claim may have nothing to do with any useful time scale.

Revisiting the Marxist Skilled-Labour Debate

2019 ◽  
Vol 27 (1) ◽  
pp. 55-91
Author(s):  
Gastón Caligaris ◽  
Guido Starosta
Keyword(s):  
Value Theory ◽  
Alternative Solution ◽  
Critical Examination ◽  
Skilled Labour ◽  
Marxian Analysis ◽  
History Of ◽  
The Subject

Abstract This article offers an overview of Marx’s textual legacy on the subject of the multiplied value-positing powers of skilled labour, and undertakes a critical reconstruction of the history of the subsequent controversies over the so-called ‘skilled-labour problem’. Critical examination of the different Marxist responses to the objections put forward by critics shows that they have failed to develop a solution that is consistent with the foundations of Marx’s value-theory. Thus, the article finally offers an alternative solution grounded in the Marxian analysis of the determinations of value as laid out in Capital.

The Big Match – Lexis v Westlaw

2004 ◽  
Vol 4 (2) ◽  
pp. 90-97 ◽  
Author(s):  
Paul Norman
Keyword(s):  
Critical Examination ◽  
The Subject ◽  
The Uk ◽  
Made In ◽  
American Academic

Lexis and Westlaw are the biggest names in subscription legal database provision, and have been settled here in the UK long enough to be the subject of a little comparative critical examination. I hope to provide this in what follows, with the caveat that my experience is of academic subscriptions, which may vary in content from their commercial counterparts. I do have the advantage of access to the respective American academic versions, so that some comparisons can also be made in that direction.

High Resolution Powder Reflectance Spectroscopy

1969 ◽  
Vol 23 (3) ◽  
pp. 235-239 ◽  
Author(s):  
R. C. Ropp
Keyword(s):  
Rare Earth ◽  
High Resolution ◽  
Rare Earths ◽  
Reflectance Spectroscopy ◽  
Polarization Data ◽  
Rare Earth Ion ◽  
Positive Identification ◽  
Measuring Techniques ◽  
Energy States ◽  
Narrow Bands

It is possible to obtain resolution of the order of 1–2 Å in the reflectance spectroscopy of powders by carefully controlling the experimental measuring techniques. One can then identify; optically, broad bands and narrow bands of the rare earths as being upper energy states and unperturbed 4 f transitions. It is even possible to show various degrees of perturbation of 4 f energy-states of a given rare-earth ion by observing Stark states which may vary from 5–90 Å in half-width. However lack of polarization data make positive identification of these Stark states impossible.

Infrared observations and the effective temperature of the peculiar star HD 101065

1975 ◽  
Vol 87 ◽  
pp. 439 ◽  
Author(s):  
A. R. Hyland ◽  
J. R. Mould ◽  
G. Robinson ◽  
J. A. Thomas
Keyword(s):  
Effective Temperature ◽  
Peculiar Star ◽  
Infrared Observations

scholarly journals On the ultra-violet spectrum of ytterbium

1906 ◽  
Vol 78 (522) ◽  
pp. 154-156
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Ultra Violet ◽  
The Subject ◽  
The Rare Earth

The rare earth, ytterbia, was discovered in 1878 by Marignac. In 1880 Nilson, in purifying Marignac’s ytterbia, found that it contained another earth which he named scandia. Cleve, and more recently his daughter Astrid Cleve, have worked much on ytterbia, and within the last few years M. Urbain has taken up the subject, and has succeeded in purifying ytterbia in larger quantities. During my own work on the fractionation of the rare earths I also have prepared and worked with ytterbia. Marignac, Nilson, Cleve, and Urbain have each presented me with some of their ytterbia. Nilson’s earth, sent in 1886, appears very pure. Unfortunately, there was only sufficient to enable me to photograph the part of its spectrum between wave-lengths 2400 and 2580.

scholarly journals Putting "Heavy" into heavy slow load.

2020 ◽  
Author(s):  
Scot Morrison ◽  
Jill Cook
Keyword(s):  
Exercise Prescription ◽  
The Body ◽  
Critical Examination ◽  
Clinical Approach ◽  
Exercise Science ◽  
The Subject

The body of literature on tendinopathy management has come a long way in the last few decades and a variety of changes in the clinical approach have emerged from this research. One particular approach that shows promise has been called “heavy slow load” (HSL) and this has been the subject of investigation in a number of RCTs. While the premise for this approach is defensible, a critical examination of the implementation of these HSL protocols results in some concerns when compared to basic exercise science principles. This article lays out some considerations that will help future investigators to improve their exercise prescription approaches in this area.

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