The preparation of layers of amorphous Se by plasma-enhanced CVD using the hydride H2Se as precursor gas is described. Information concerning the structure of the films was obtained from Raman spectroscopy. The spectra of amorphous Se indicated that the dominant molecular structure is the eight-membered ring and/or a chain with Se8 molecular fragments. This material exhibited reversible photodarkening when illuminated at 77 K. In order to explain this phenomenon, we propose a mechanism which takes into account the role of the (...) lone-pair electron orbitals of Se in their contribution to structural ordering. Illumination can cause a distortion in the normal bonding direction between nearest-neighbour Se atoms and induce in this way intrinsic defect states located at the band edges. In the photo-darkened state, optical transition will occur between these defect states. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Homeric ΔΙΙΠΕΤΕΟΣΠΟΤΑΜΟΙΟand the Celestial NileR. Drew GriffithHomeric διιπετής, which occurs only in the verse–end formula διιπετέος (Il. 16.174, 17.263, 21.268, 326; Od. 4.477, 581, 7.284; cf. Hes. fr. 320 Merkelbach–West), is usually interpreted as "fallen from Zeus, i.e., from heaven,... fed or swollen by rain" (LSJ),1 for high–thundering, cloud–gatherer Zeus is the sky who rains and snows (Il. 12.25; Od. 9.111, 14.457, Alc. Z 14.1 Lobel–Page 5 338.1 Voigt; (...) Ar. Nub. 368, 373; Babrius 65.1; Marcus Aurelius 5.7), and rivers can be "swollen by rain and melted snow" (). Yet it only takes a moment for the desperate nature of this interpretation to become clear: it has at least four flaws.2First, there is διι–. We may explain the quantity of the second iota (long in διιπετής, short in Διί) either as metrical lengthening, or as a survival of the Mycenaean, with or without the emendation to διειπετής proposed by one Zenodorus (schol. E2Od. 4.477, var. l. Zenodotus, HQ) and supported by some moderns,3 but the form itself is unexpected. Even supporters of the usual interpretation admit that διι is a very odd way of saying "from Zeus," which should be expressed by a [End Page 353] genitive of source:4 indeed, when Euripides wants to characterize a statue as having "fallen from the sky," he uses διοπετής (IT 977; cf. fr. 971 Nauck2 ). They account for διι- in one of three ways: either as chosen on the analogy of διίφιλος where the dative is appropriate,5 or as a compendious expression meaning "by (the command of) Zeus,"6 as an Arcado– Cypriot use of the dative as an ablative.7 This last approach relies in turn on the hypothesis (itself controversial) of an Achaean stratum of the Homeric language, in which are alleged to persist forms specific to the Mycenaean dialect.8Second, the final element, πετής, is elsewhere in Homer derived from πέτομαι (Il. 12.201, etc.;Il. 8.42, etc.; cf. Hes. Theog. 267). Unlike διιπετής, these words are accented paroxytone (but note παλιμπετές Il. 16.395, Od. 5.27, which means "falling or flying backward"; Pind. Pyth. 3.105; and Aesch. Supp. 782), but this shows only that during the Alexandrian period, when the written accents were devised, scholars associated them with a different root from διιπετής. Leaving our word aside, for examples of -πετής derived from πίπτω we must look to Aeschylus, Pindar, and subsequent authors.9 (Words with πετής from πετάννυμι are attested in later Greek.)10Third, the earliest post–Homeric uses of διιπετής (Eur. Bacch. 1267, Rhes. 43, Hypsipyle fr. 1. sp. IV, 1.31 Bond; Hippoc. Morb. Mul. 1.24) demand the translation "translucent" vel sim. (Etym. Magn. s.v.), and Zenodotus (apud schol. Il. 17.263) glosses the word in its Homeric use as διαυγής,11 yet the semantic development from "fallen from Zeus, etc." (on the usual interpretation) to "translucent" can only be seen as "encore inexpliqué."12 [End Page 354]Fourth, one of the three named rivers to which Homer applies διιπετής is the Nile (Od. 4.477, 581; the others are Spercheius, Il. 16.174, and Scamander, Il. 21.268, 326), yet if ever there were a river that is not "fed or swollen by rain" it is the Nile: rainfall is scarce in Egypt (Hdt. 3.10.3), and, knowing this, Diogenes hypothesized that the Nile was fed by subterranean springs (64 A18 Diels–Kranz; cf. Sen. Q.Nat. 4.2.28–30, 6.8.3–5; schol. Ap. Rhod. 4.269 = p. 277 Wendel). The application of the epithet to the Nile would have, therefore, to be classed among Homer's (admittedly numerous) formulary illogicalities.13Not all scholars accept the usual view. In 1958 M. Treu pointed to a then newly discovered papyrus fragment of Alcman containing the adjective διαιπετής in the phrase (III 66–67 PMG, PMGF = fr. 26.66–67 Calame), which was taken to describe a star "falling through..., less prob.... flying through" heaven (LSJ Suppl. s.v.),14 to hypothesize that the Homeric instances of διιπετής are all miscorrections of an original διαιπετής, "flying through." This theory has won few adherents,15 and R. Renehan (1972b) has with more... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Homeric ΔΙΙΠΕΤΕΟΣΠΟΤΑΜΟΙΟand the Celestial NileR. Drew GriffithHomeric διιπετής, which occurs only in the verse–end formula διιπετέος (Il. 16.174, 17.263, 21.268, 326; Od. 4.477, 581, 7.284; cf. Hes. fr. 320 Merkelbach–West), is usually interpreted as "fallen from Zeus, i.e., from heaven,... fed or swollen by rain" (LSJ),1 for high–thundering, cloud–gatherer Zeus is the sky who rains and snows (Il. 12.25; Od. 9.111, 14.457, Alc. Z 14.1 Lobel–Page 5 338.1 Voigt; (...) Ar. Nub. 368, 373; Babrius 65.1; Marcus Aurelius 5.7), and rivers can be "swollen by rain and melted snow" (). Yet it only takes a moment for the desperate nature of this interpretation to become clear: it has at least four flaws.2First, there is διι–. We may explain the quantity of the second iota (long in διιπετής, short in Διί) either as metrical lengthening, or as a survival of the Mycenaean, with or without the emendation to διειπετής proposed by one Zenodorus (schol. E2Od. 4.477, var. l. Zenodotus, HQ) and supported by some moderns,3 but the form itself is unexpected. Even supporters of the usual interpretation admit that διι is a very odd way of saying "from Zeus," which should be expressed by a [End Page 353] genitive of source:4 indeed, when Euripides wants to characterize a statue as having "fallen from the sky," he uses διοπετής (IT 977; cf. fr. 971 Nauck2 ). They account for διι- in one of three ways: either as chosen on the analogy of διίφιλος where the dative is appropriate,5 or as a compendious expression meaning "by (the command of) Zeus,"6 as an Arcado– Cypriot use of the dative as an ablative.7 This last approach relies in turn on the hypothesis (itself controversial) of an Achaean stratum of the Homeric language, in which are alleged to persist forms specific to the Mycenaean dialect.8Second, the final element, πετής, is elsewhere in Homer derived from πέτομαι (Il. 12.201, etc.;Il. 8.42, etc.; cf. Hes. Theog. 267). Unlike διιπετής, these words are accented paroxytone (but note παλιμπετές Il. 16.395, Od. 5.27, which means "falling or flying backward"; Pind. Pyth. 3.105; and Aesch. Supp. 782), but this shows only that during the Alexandrian period, when the written accents were devised, scholars associated them with a different root from διιπετής. Leaving our word aside, for examples of -πετής derived from πίπτω we must look to Aeschylus, Pindar, and subsequent authors.9 (Words with πετής from πετάννυμι are attested in later Greek.)10Third, the earliest post–Homeric uses of διιπετής (Eur. Bacch. 1267, Rhes. 43, Hypsipyle fr. 1. sp. IV, 1.31 Bond; Hippoc. Morb. Mul. 1.24) demand the translation "translucent" vel sim. (Etym. Magn. s.v.), and Zenodotus (apud schol. Il. 17.263) glosses the word in its Homeric use as διαυγής,11 yet the semantic development from "fallen from Zeus, etc." (on the usual interpretation) to "translucent" can only be seen as "encore inexpliqué."12 [End Page 354]Fourth, one of the three named rivers to which Homer applies διιπετής is the Nile (Od. 4.477, 581; the others are Spercheius, Il. 16.174, and Scamander, Il. 21.268, 326), yet if ever there were a river that is not "fed or swollen by rain" it is the Nile: rainfall is scarce in Egypt (Hdt. 3.10.3), and, knowing this, Diogenes hypothesized that the Nile was fed by subterranean springs (64 A18 Diels–Kranz; cf. Sen. Q.Nat. 4.2.28–30, 6.8.3–5; schol. Ap. Rhod. 4.269 = p. 277 Wendel). The application of the epithet to the Nile would have, therefore, to be classed among Homer's (admittedly numerous) formulary illogicalities.13Not all scholars accept the usual view. In 1958 M. Treu pointed to a then newly discovered papyrus fragment of Alcman containing the adjective διαιπετής in the phrase (III 66–67 PMG, PMGF = fr. 26.66–67 Calame), which was taken to describe a star "falling through..., less prob.... flying through" heaven (LSJ Suppl. s.v.),14 to hypothesize that the Homeric instances of διιπετής are all miscorrections of an original διαιπετής, "flying through." This theory has won few adherents,15 and R. Renehan (1972b) has with more... (shrink)

Electronegativity, described by Linus Pauling described as “The power of an atom in a molecule to attract electrons to itself” (Pauling in The nature of the chemical bond, 3rd edn, Cornell University Press, Ithaca, p 88, 1960), is used to predict bond polarity. There are dozens of methods for empirically quantifying electronegativity including: the original thermochemical technique (Pauling in J Am Chem Soc 54:3570–3582, 1932), numerical averaging of the ionisation potential and electron affinity (Mulliken in J Chem Phys (...) 2:782–784, 1934), effective nuclear charge and covalent radius analysis (Sanderson in J Chem Phys 23:2467, 1955) and the averaged successive ionisation energies of an element’s valence electrons (Martynov and Batsanov in Zhurnal Neorganicheskoi Khimii 5:3171–3175, 1980), etc. Indeed, there are such strong correlations between numerous atomic parameters—physical and chemical—that the term “electronegativity” integrates them into a single dimensionless number between 0.78 and 4.00 that can be used to predict/describe/model much of an element’s physical character and chemical behaviour. The design of the common and popular medium form of the periodic table is in large part determined by four quantum numbers and four associated rules. However, adding electronegativity completes the construction so that it displays the multi-parameter periodic law operating in two dimensions, down the groups and across the periods, with minimal ambiguity. (shrink)

Health care professionals often face moral dilemmas. Not dealing constructively with moral dilemmas can cause moral distress and can negatively affect the quality of care. Little research has been documented with methodologies meant to support professionals in care for the homeless in dealing with their dilemmas. Moral case deliberation is a method for systematic reflection on moral dilemmas and is increasingly being used as ethics support for professionals in various health-care domains. This study deals with the question: What is the (...) contribution of MCD in helping professionals in an institution for care for the homeless to deal with their moral dilemmas? A mixed-methods responsive evaluation design was used to answer the research question. Five teams of professionals from a Dutch care institution for the homeless participated in MCD three times. Professionals in care for the homeless value MCD positively. They report that MCD helped them to identify the moral dilemma/question, and that they learned from other people’s perspectives while reflecting and deliberating on the values at stake in the dilemma or moral question. They became aware of the moral dimension of moral dilemmas, of related norms and values, of other perspectives, and learned to formulate a moral standpoint. Some experienced the influence of MCD in the way they dealt with moral dilemmas in daily practice. Half of the professionals expect MCD will influence the way they deal with moral dilemmas in the future. Most of them were in favour of further implementation of MCD in their organization. (shrink)

The 1973 archeological discovery of important documents of classical thought known as the Huang-Lao Boshu coupled with advancements in contemporary jurisprudence make possible a reassessment of the philosophies of pre-Qin and early Han China. This study attempts to elucidate the importance of the Huang-Lao school within the intellectual tradition of China through a comparison of the Boshu's philosophical position, particularly its understanding of the relation between law and morality, with the respective views of major thinkers of the period--Confucius, Han Fei, (...) Lao Zi, Zhuang Zi, and to a lesser extent, Shen Dao, Shen Buhai and the authors of the Guan Zi and He Guan Zi. So doing reveals Huang-Lao to be a unique and sophisticated social and political philosophy which, until its expulsion from court by Emperor Wu and subsequent adoption by Daoist religion, served as the ideological foundation for the post-Qin reforms of the early Han. (shrink)

Understanding of organizational ethics phenomena requires complex understanding of organizational practices in their real world contexts. We can try to understand and build theory about these complex real world practices from the points of view of: a traditional deductive, ethics literature-based, literature gap formulation approach; or, an inductive, practitioner-based literature gap formulation approach. This consideration of inductive, practitioner-based versus deductive, literature-based literature gap formulation is related to the discussion concerning “engaged scholarship” and relationships and gaps between theory and practice in (...) organization studies [Van De Ven, 2007, Engaged Scholarship: A Guide for Organizational and Research Knowledge ]. However, there is an important difference with respect to the key issue of ethics literature versus practitioner-based literature gap formulation. This article offers examples of the two different approaches and makes comparisons between them. Implications for practice-based organizational ethics theory building, Ph.D. education, and public intellectual work are considered. (shrink)

This book has been prompted by the dishonesty of much contemporary treatment of the Bible. It is not a 'debunking' of the Bible, but an attempt to show what qualities and what preliminary assumptions are needed for the Bible to be genuinely understood and interpreted. Honest scholarship and honest interpretations must acknowledge that a revolution has taken place in the understanding of the Bible during the last two hundred years and that to try to deny or play down or disguise (...) the results of this revolution is to be faithful neither to God nor to ourselves. With that conviction, and with their customary panache, the authors then go on to look at the facts about the Bible; the New Testament interpretation of scripture; the interpretation of the Bible in the early church; historical criticism; fundamentalism; and prophecy. 'They analyse the books of the Bible, examine the canon and the Bible as norm and as the church's book, consider the role of faith and conclude with a chapter 'In Praise of the Bible'. Here, in the last book together, the Professors Hanson are indeed on top of their form. (shrink)

Este artigo recorda os principais aspectos e motivações da Expedição Langsdorff, missão de reconhecimento do interior do Brasil iniciada em 1821, composta pelo cônsul russo barão Langsdorff, o pintor alemão Moritz Rugendas, Aimé-Adrien Taunay, Nicolas-Antoine Taunay, o polígrafo Hercules Florence e o especialista em mapas Néster G. Rubtsov. Busca diferenças entre esta expedição e iniciativas outras, a título de exemplo, as dos bandeirantes e jesuítas, bem como a expedição indigenista de Rondon, e propõe o aprofundamento das investiga­ções. Apresenta atributos resgatados (...) pela poesia brasileira contemporânea e elementos cons­titutivos da identidade cultural brasileira presentes na Expedição Langsdorff, os quais os auto­res sugerem ser relevantes para pesquisadores do tema e para a inserção do Brasil no contexto internacional político, diplomático e econômico nos tempos hodiernos. (shrink)

Type theory is a fast-evolving field at the crossroads of logic, computer science and mathematics. This gentle step-by-step introduction is ideal for graduate students and researchers who need to understand the ins and outs of the mathematical machinery, the role of logical rules therein, the essential contribution of definitions and the decisive nature of well-structured proofs. The authors begin with untyped lambda calculus and proceed to several fundamental type systems culminating in the well-known and powerful Calculus of Constructions. The book (...) also covers the essence of proof checking and proof development, and the use of dependent type theory to formalize mathematics. The only prerequisites are a good knowledge of undergraduate algebra and analysis. Carefully chosen examples illustrate the theory throughout. Each chapter ends with a summary of the content, some historical context, suggestions for further reading and a selection of exercises to help readers familiarize themselves with the material. (shrink)

“These fragments I have shored against my ruins.”.

(No abstract is available for this citation).