Evaluation of the Structure Factor of Cuprite and Bonding Chracterisitcs

1997 ◽  
Vol 3 (S2) ◽  
pp. 1053-1054
Author(s):  
M. Y. Kim ◽  
J. M. Zuo ◽  
J. C. H. Spence
Keyword(s):  
Charge State ◽  
Oxygen Deficiency ◽  
Copper Oxides ◽  
Naturally Occurring ◽  
Simple Cubic ◽  
Bcc Structure ◽  
Structure And Bonding ◽  
Charge States ◽  
The Relationship ◽  
Oxygen Atoms

Cu2O is a semiconductor with a band gap of 2.17eV, and its crystal structure is simple cubic. Oxygen atoms form a bcc structure and each oxygen atom is tetrahedrally coordinated by copper atoms, which makes copper linearly coordinated by two oxygen atoms. The structure of cuprite is interesting because the charge state of Cu and oxygen. The most common charge states of Cu is 2+, however, in cuprite for each oxygen there are two Cu atoms which suggest a 1+ charge state of Cu. Charge density of Cu and oxygen are also interesting because of the high Tc superconductors based on copper and oxygen planes and chains. The superconductivity is believed due to the different charge states of copper and/or oxygen in the Cu-oxygen planes due to the doping or oxygen deficiency. by studying the naturally occurring charge states of Cu in Cu2O and CuO, a better understanding of the relationship between structure and bonding can be achieved for the important copper oxides.

Crystal chemistry of high-Tc superconductors

1990 ◽  
Vol 48 (4) ◽  
pp. 1118-1119
Author(s):  
Maryvonne Hervieu
Keyword(s):  
Oxygen Deficiency ◽  
Large Family ◽  
Copper Oxides ◽  
High Tc Superconductors ◽  
High Tc ◽  
Single Mechanism ◽  
Square Planar ◽  
History Of ◽  
Bismuth Cuprates ◽  
New Compounds

Four years after the discovery of superconductivity at high temperature in the Ba-La-Cu-O system, more than thirty new compounds have been synthesized, which can be classified in six series of copper oxides: La2CuO4 - type oxides, bismuth cuprates, YBa2Cu3O7 family, thallium cuprates, lead cuprates and Nd2CuO4 - type oxides. Despite their quite different specific natures, close relationships allow their structures to be simply described through a single mechanism. The fifth first families can indeed be described as intergrowths of multiple oxygen deficient perovskite slabs with multiple rock salt-type slabs, according to the representation [ACuO3-x]m [AO]n.The n and m values are integer in the parent structures, n varying from 0 to 3 and m from 1 to 4; every member of this large family can thus be symbolized by [m,n]. The oxygen deficient character of the perovskite slabs involves the existence or the co-existence of several types of copper environment: octahedral, pyramidal and square planar.Both mechanisms, oxygen deficiency and intergrowth, are well known to give rise easily to nonstoichiometry phenomena. Numerous and various phenomena have actually been characterized in these cuprates, strongly depending on the thermal history of the samples.

scholarly journals Rivalry or alliance?: the relationship between hyperbole and literal language

2013 ◽  
pp. 285
Author(s):  
Laura Cano Mora
Keyword(s):  
Figurative Language ◽  
Common Pattern ◽  
Naturally Occurring ◽  
British National Corpus ◽  
Literal Expression ◽  
The Relationship ◽  
National Corpus ◽  
Figurative Expressions

This paper focuses on the relationship between neighbouring literal and figurative expressions, a much under-researched area in figurative language theories. Traditionally it has been assumed that language is used figuratively when a literal expression would be inadequate, thus supporting the view that figurative and literal language replace or substitute each other. In order to question this view and to explore this relationship, a group of hyperbolic adverbs extracted from the British National Corpus and used in naturally-occurring speech was examined. The results show that hyperbole and literal comments seem to extend and complement, rather than replace, each other. This complementation is often achieved through paraphrase or clarification of a preceding remark, whether literal or exaggerated. The analysis also seems to suggest that if speakers need to add some information the most common pattern is a hyperbole followed, rather than preceded, by a literal expression.El presente artículo se centra en el estudio de la relación entre expresiones literales y figuradas adyacentes, cuestión rara vez investigada en las teorías del lenguaje figurado. Tradicionalmente se ha creído que los hablantes utilizamos las figuras cuando el lenguaje literal resulta inadecuado, reafirmando así la idea de que el lenguaje literal y figurado se sustituyen el uno al otro. Con el fin de cuestionar esta visión y explorar dicha relación examinamos un grupo de adverbios hiperbólicos usados en conversaciones reales extraídas del British National Corpus. Los resultados indican que la hipérbole y el uso literal del lenguaje parecen complementarse en lugar de reemplazarse. Con frecuencia dicha complementariedad se consigue a través de la paráfrasis o clarificación de un comentario previo, ya sea literal o exagerado. El análisis a su vez parece sugerir que cuando el hablante siente la necesidad de añadir información el patrón más común es una hipérbole seguida, en lugar de precedida, de una expresión literal.

scholarly journals Municipal Representatives’ Accounts of Decision-Making Practices during Geriatric Case Conferences

2017 ◽  
Vol 23 (45) ◽  
pp. 129
Author(s):  
Søren Beck Nielsen
Keyword(s):  
Senior Citizens ◽  
General Characteristic ◽  
The Other ◽  
Residential Home ◽  
Residential Homes ◽  
Social Actors ◽  
Naturally Occurring ◽  
Case Conferences ◽  
The Relationship ◽  
Elderly Citizen

This article addresses questions of elucidation in talk-in-interaction. How do social actors give accounts of what they are doing? To what degree do actors sustain a taken-for-granted level of reasoning? The analysis is based upon naturally occurring data consisting of a corpus of audio recorded case conferences at various geriatric wards in Danish hospitals. The article elaborates one of the important insights of Harold Garfinkel regarding the relationship between discourse and social interaction: as a general characteristic, people tend to treat their fellow interlocutors’ conversational contributions as adequate for-all-practical-purposes. Specifically, the article investigates how Danish municipal representatives account for their decisions about whether or not senior citizens are to be referred to residential homes. This practice, I demonstrate, is characterized by non-explicitness with regards to rules and regulations. Instead, municipal representatives make use of developmental discourse: a worsened condition is used to justify a referral to a residential home. On the other hand, an improved condition is used to justify that an elderly citizen is not referred to a residential home.

Dual origin and segmental organisation of the avian scapula

Development ◽  
2000 ◽  
Vol 127 (17) ◽  
pp. 3789-3794 ◽  
Author(s):  
R. Huang ◽  
Q. Zhi ◽  
K. Patel ◽  
J. Wilting ◽  
B. Christ
Keyword(s):  
Head And Neck ◽  
Shoulder Girdle ◽  
Lateral Plate ◽  
Mouse Mutants ◽  
Naturally Occurring ◽  
Restricted Domains ◽  
Mesodermal Origin ◽  
Dual Origin ◽  
The Relationship ◽  
Somitic Mesoderm

Bones of the postcranial skeleton of higher vertebrates originate from either somitic mesoderm or somatopleural layer of the lateral plate mesoderm. Controversy surrounds the origin of the scapula, a major component of the shoulder girdle, with both somitic and lateral plate origins being proposed. Abnormal scapular development has been described in the naturally occurring undulated series of mouse mutants, which has implicated Pax1 in the formation of this bone. Here we addressed the development of the scapula, firstly, by analysing the relationship between Pax1 expression and chondrogenesis and, secondly, by determining the developmental origin of the scapula using chick quail chimeric analysis. We show the following. (1) The scapula develops in a rostral-to-caudal direction and overt chondrification is preceded by an accumulation of Pax1-expressing cells. (2) The scapular head and neck are of lateral plate mesodermal origin. (3) In contrast, the scapular blade is composed of somitic cells. (4) Unlike the Pax1-positive cells of the vertebral column, which are of sclerotomal origin, the Pax1-positive cells of the scapular blade originate from the dermomyotome. (5) Finally, we show that cells of the scapular blade are organised into spatially restricted domains along its rostrocaudal axis in the same order as the somites from which they originated. Our results imply that the scapular blade is an ossifying muscular insertion rather than an original skeletal element, and that the scapular head and neck are homologous to the ‘true coracoid’ of higher vertebrates.

Formation of different charge states and the charge state fractions of sputtered Ti and Ni

1986 ◽  
Vol 166 (2-3) ◽  
pp. 458-479 ◽  
Author(s):  
H.J. Barth ◽  
E. Mühling ◽  
W. Eckstein
Keyword(s):  
Charge State ◽  
Charge States

The crystal structure of kamchatkite, a new naturally occurring oxychloride sulphate of potassium and copper

1990 ◽  
Vol 54 (377) ◽  
pp. 613-616 ◽  
Author(s):  
T. V. Varaksina ◽  
V. S. Fundamensky ◽  
S.K. Filatov ◽  
L. P. Vergasova
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Direct Methods ◽  
New Mineral ◽  
Space Group ◽  
Naturally Occurring ◽  
Discrepancy Index ◽  
Oxygen Atoms

AbstractThe crystal structure of the new mineral kamchatkite, a= 9.741(5), b= 12.858(6), c=7.001(3)Å, space group Pna21, Z = 4, has been determined through direct methods using 1430 intensities and refined to a final discrepancy index R = 0.055. It contains (SO4) tetrahedra and Cu octahedra interconnected by oxygen atoms to form an electrostatically neutral three-dimensional arrangement of formula Cu3O[SO4]2 which contains channels parallel to [001]. The channels are not empty but house KCl molecules.

scholarly journals Ars⪚ne Didn't See It: Coaching, Research and the Promise of a Discursive Psychology

2012 ◽  
Vol 7 (4) ◽  
pp. 615-645 ◽  
Author(s):  
Paul K. Miller
Keyword(s):  
Social Psychology ◽  
Case Studies ◽  
Political Discourse ◽  
Language Use ◽  
Psychological Perspective ◽  
Discursive Psychology ◽  
Medical Communication ◽  
Naturally Occurring ◽  
Wide Range ◽  
The Relationship

For twenty five years the discursive psychological perspective has been at the vanguard of innovative research in social psychology, producing highdetail systematic analyses of dynamic, constructive language use in a wide range of practical settings. To date, it has found applications in the study of medical communication, racism, political discourse, emotion and accounts of success and failure in sport, to highlight but a few. Its lack of headway in the specific study of coaching is perhaps, therefore, somewhat surprising given the transparently task-focused character of many naturally-occurring verbal activities in the domain. This article draws on salient literature and two brief case studies in illustrating some of the ways that the perspective can inform an approach to coaching interaction that does not draw on ontologically-problematic cognitivist assumptions regarding the relationship between thought and action. A foundational argument is then made for greater engagement with discursive psychology within the broader realm of coaching science.

Note on an induction axiom

1978 ◽  
Vol 43 (1) ◽  
pp. 113-117
Author(s):  
J. B. Paris
Keyword(s):  
Physical World ◽  
First Order ◽  
Naturally Occurring ◽  
Order Language ◽  
Image Position ◽  
The Relationship

Let θ(ν) be a formula in the first-order language of arithmetic and letIn this note we study the relationship between the schemas I′ and I+.Our interest in I+ lies in the fact that it is ostensibly a more reasonable schema than I′. For, if we believe the hypothesis of I+(θ) then to verify θ(n) only requires at most 2log2(n) steps, whereas assuming the hypothesis of I′(θ) we require n steps to verify θ(n). In the physical world naturally occurring numbers n rarely exceed 10100. For such n applying 2log2(n) steps is quite feasible whereas applying n steps may well not be.Of course this is very much an anthropomorphic argument so we would expect that it would be most likely to be valid when we restrict our attention to relatively simple formulas θ. We shall show that when restricted to open formulas I+ does not imply I′ but that this fails for the classes Σn, Πn, n ≥ 0.We shall work in PA−, where PA− consists of Peano's Axioms less induction together with∀u, w(u + w = w + u ∧ u · w = w · u),∀u, w, t ((u + w) + t = u + (w + t) ∧ (u · w) · t = u · (w · t)),∀u, w, t(u · (w + t) = u · w + u · t),∀u, w(u ≤ w ↔ ∃t(u + t = w)),∀u, w(u ≤ w ∨ w ≤ u),∀u, w, t(u + w = u + t → w = t).The reasons for working with PA− rather than Peano's Axioms less induction is that our additional axioms, whilst intuitively reasonable, will not necessarily follow from some of the weaker forms of I+ which we shall be considering. Of course PA− still contains those Peano Axioms which define + andNotice that, trivially, PA− ⊦ I′(θ) → I+(θ) for any formula θ.

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