487 research outputs found
The Myth of Urban Unity. Religion and Social Performance in Late Medieval Braunschweig
No full textArlinghaus F-J. The Myth of Urban Unity. Religion and Social Performance in Late Medieval Braunschweig. In: Goodson C, Lester AE, Symes C, eds. Cities, Texts, and Social Networks, 400-1500: Experiences and Perceptions of Medieval Urban Space. Farnham: Ashgate; 2010: 215-232
REACTIONS OF LASER ABLATED Ti, Zr AND Hf ATOMS WITH ACETYLENE: INFRARED SPECTRA OF THE PRODUCTS OF METAL INSERTION INTO THE C-H BOND
No full textAuthor Institution: Department of Chemistry, University of VirginiaThe reactions of laser ablated Group IV metal atoms with acetylene in excess argon have been studied using the matrix isolation infrared spectroscopic technique. The infrared spectra of the argon matrices (6-7 K) that result from the codeposition of the laser ablated metal atoms with mixtures provide evidence for the presence of several new product species that arise from the metal atom activation of the acetylene C-H bond. These new species will be identified by their infrared spectra and the effects of and D isotopic substitution in the precursor molecule
Investigation of the interaction between corticomuscular coherence, motor precision and perceived difficulty in wrist flexion and extension
No full textIncludes abstract.Includes bibliographical references.Recently, behavioural (motor precision) differences were reported between isometric wrist flexion and extension. Neurophysiological as well as clinical differences have also been reported between these antagonistic movements. Corticomuscular coherence (CMC), i.e. the frequency specific temporal coupling between the electroencephalogram (EEG) and electromyogram (EMG) recorded during isometric force production, reflects the functional connectivity between cortex and muscle. A single muscle (flexor digitorum superficialis) study suggests a positive correlation between 15-35 Hz (beta) CMC and motor precision of the muscle. Yet, no study has simultaneously compared CMC and motor precision between wrist flexion and extension. Task perceived difficulty, which is a perceptual variable, may influence both motor precision and CMC, but has not been studied yet. The main aim of the present study was to investigate the interaction between CMC, motor precision and perceived difficulty in isometric wrist flexion and extension tasks
MATRIX INFRARED SPECTRUM AND BONDING IN THE MONOCHLOROMETHYL RADICAL
No full textAuthor Institution: Department of Chemistry, University of VirginiaSimultaneous deposition of (X = F, Cl, Br, I) with atomic lithium or sodium at high dilution in argon on a CsI window maintained at has produced the monochloromethyl free radical for infrared spectroscopic study. Vibrational assignments to (the symmetric C-Cl stretch), (the symmetric valance angle bend) and (the out of plane hydrogen bend) are supported by the reactions of lithium with and lithium or sodium with . These assignments are further substantiated by normal coordinate calculations. The unusually high C-Cl force constant in (4.09=0.03 mdyn/\AA) indicates considerable stabilization of the C-Cl bond. Therefore, we suggest (p-p) bonding in . The average calculated does not quantitatively account for the observed isotopic frequencies of . However, a simple harmonicquartic potential function obtained from first order perturbation theory (V(O) = (1/2(1.83) ((O)O)) ergs) accurately determines the observed spectrum: this large positive quartic term is evidence for a planar radical
Author Correction: A super-massive Neptune-sized planet (Nature, (2023), 622, 7982, (255-260), 10.1038/s41586-023-06499-2)
No full textCorrection to: Nature Published online 30 August 2023 In the version of the article initially published, Ian Crossfield (Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA) was missing from the author list and is now included, while Fig. 2 has been updated with the correct density values of all the exoplanets. The changes are made in the HTML and PDF versions of the article
MAGNETIC CIRCULAR DICHROISM OF CYCLOOCTATETRAENYL MONOANIONS ISOLATED IN ARGON MATRICES
No full text A. D. McLachlan and L. C. Snyder, J. Chem. Phys. 36, 1159 (1962).Author Institution: Department of Chemistry, University of VirginiaThe conformation and electronic structure of cyclooctatetraene (COT) and its anions have been of interest for many years. COT has a nonplanar tub structure () and is nonaromatic. The dianion () is almost certainly planar, aromatic, and of symmetry. The situation is less clear with respect to the monoanion . We have measured the magnetic circular dichrosim (MCD) of COT isolated in Ar matrices by codepositing COT and alkali metal atoms. Bands are observed at about 340 and 300 nm. The former shows a remarkably well resolved series of vibronic A terms. The MCD is temperature independent, strongly supporting the view*** that the ground state structure of is consistent with an orbitally degenerate planar configuration subject to a dynamic Jahn-Teller Effect in the in-plane C-C stretching vibration. The lack of MCD temperature dependence allows us to place a lower limit on the strength of the Jahn-Teller coupling
Chains and freedom: or, The life and adventures of Peter Wheeler, a colored man yet living. By the author of the 'Mountain wild flower.'
No full textvii, [1], [9]-260 p
Sub-Sets of Cancer Stem Cells Differ Intrinsically in Their Patterns of Oxygen Metabolism
No full textPMCID: PMC3640080This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Characterization and structure in the development of Tudor comedy
No full textThe role of characterization in dramatic structure is assessed by theoretical criteria.
Characters who perform actions necessary for the completion of the narrative sequence are
said to be "bound" to the narrative; those without such obligations are "free". Characters
who maintain a single, constant meaning during the course of a play are said to be "static";
characters who change or develop into new roles are "dynamic". Horatian decorum
demanded that comic characters be static, and the characters of Plautine and Terentian
tradition were almost always bound to narrative intrigue. However, evaluations of six
Tudor comedies show an increasing use of non-classical characterization within the comic
form.
In the early comedies lohan lohan and Roister Doister all characters are bound and
static, yet the impetus to enlarge the role of characterization is evident. The characters of
lohan lohan are expanded from their French source, and Roister Doister includes
extraneous episodes in which Udall displays his braggart hero. Free characters abound in
Misogonus; as well the play brings dynamic characterization into the scope of comedy with
the conversion of its prodigal son.
Free characters offer new possibilities of non-narrative plotting. In comedies of the
1580s favourite traditional characters appear as diversions outside the action, and thematic
arrangements of characters inform the increasingly complex plots. Lyly stresses the
symbolic potential of characters in Endimion, whereas Greene uses dynamic
characterization to heighten the illusion of independent figures in Friar Bacon and Friar
Bungay. Love's Labour's Lost exposes the limitations of comic artifice by pulling the
characters between convention and individualization.
By the end of the sixteenth century free and dynamic characters had become
common, and characterization had established a sizable claim on the design of English
comedy. These developments set the English form apart from its neoclassical counterparts
Managing pollution control in Brazil : the potential use of taxes and fines by federal and state governments
No full textThe authors make a case for federal monitoring of state environmental agencies'(SEPAs') performance because of the tradeoff for the states between the need to raise revenue from taxes on local output and the need to limit pollution. They also show that fines and taxes assigned respectively to the federal and state governments can improve firms'compliance and SEPA's performance, and hence environmental quality, without damaging state revenue, and perhaps even improving it. For their analysis, the authors rely on numerical policy simulations based on an analytical framework designed as a multilevel Stackelberg game. This framework reproduces the hierarchical structure of pollution control policies in Brazil, where the federal environmental protection agency relies on SEPAs to ensure that federally defined minimum ambient standards are met locally. The numerical simulations are based on a case study of the food, and the printing and publishing industries.Urban Services to the Poor,Environmental Economics&Policies,Water and Industry,Pollution Management&Control,Health Monitoring&Evaluation
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