6,630 research outputs found
The Apollo 14 docking anomaly
Six docking attempts were required to achieve initial latch engagement during the Apollo 14 translunar docking event. Although subsequent performance of the docking hardware was normal, the docking probe was retained for a thorough postflight investigation. Pertinent design details of the docking system, the mission events related to the anomaly, and a discussion of the postflight investigation of the cause of the anomaly are presented
Baker domains for Newton's method
We show that there exists an entire function without finite asymptotic values
for which the associated Newton function tends to infinity in some invariant
domain. The question whether such a function exists had been raised by Douady.Comment: 8 page
CURRENT ISSUES AFFECTING TRADE AND TRADE POLICY: AN ANNOTATED LITERATURE REVIEW
This review provides a base of literature describing current issues and research on the impacts of lobalization and the industrialization of agriculture and recent approaches to analyze and model agricultural trade and trade policies. Three key factors of the survey are differentiated goods, global economic integration and international supply chain linkages. The review covers 182 publications, which are presented alphabetically by author with a brief annotation describing how it relates to the above criteria. The articles are also indexed by keyword. A brief summary highlights the documented literature and includes a series of issues for future discussion and research.International Relations/Trade,
Resonances, radiation pressure and optical scattering phenomena of drops and bubbles
Acoustic levitation and the response of fluid spheres to spherical harmonic projections of the radiation pressure are described. Simplified discussions of the projections are given. A relationship between the tangential radiation stress and the Konstantinov effect is introduced and fundamental streaming patterns for drops are predicted. Experiments on the forced shape oscillation of drops are described and photographs of drop fission are displayed. Photographs of critical angle and glory scattering by bubbles and rainbow scattering by drops are displayed
Remote sensing applications in forestry. The development of an earth resources information system using aerial photographs and digital computers photographs and digital computers
Remote aerial sensing and automatic mapping for forest resources information syste
T-cell modulation for the treatment of chronic plaque psoriasis with efalizumab (Raptiva (TM)): Mechanisms of action
Psoriasis is a chronic, incurable, auto-immune disorder with cutaneous manifestations. New evidence on the central role of the immune system in the pathogenesis of psoriasis increasingly provides insight into pathogenic steps that can be modulated to provide disease control. Numerous biological therapies are in various stages of clinical development, with expectation of providing enhanced safety and efficacy over currently available psoriasis therapies. Efalizumab, a recombinant humanized monoclonal IgG1 antibody, is a novel targeted T-cell modulator that inhibits multiple steps in the immune cascade that result in the production and maintenance of psoriatic plaques, including initial T-cell activation and T-cell trafficking into sites of inflammation, including psoriatic skin, with subsequent reactivation in these sites. This article reviews the pharmacodynamic, pharmacokinetic and clinical effects observed during phase I, II and III efalizumab trials in patients with moderate to severe chronic plaque psoriasis. Copyright (C) 2004 S. Karger AG, Basel
Milk whey protein concentration and mRNA associated with β-lactoglobulin phenotype
Two common genetic variants of β-lactoglobulin (β-lg), A and B, exist as co- dominant alleles in dairy cattle (Aschaffenburg, 1968). Numerous studies have shown that cows homozygous for β-lg A have more β-lg and less α-lactalbumin (α-la) and casein in their milk than cows expressing only the B variant of β-lg (Ng-Kwai-Hang et al. 1987; Graml et al. 1989; Hill, 1993; Hill et al. 1995, 1997). These differences have a significant impact on the processing characteristics of the milk. For instance, the moisture-adjusted yield of Cheddar cheese is up to 10% higher using milk from cows of the β-lg BB phenotype compared with milk from cows expressing only the A variant (Hill et al. 1997). All these studies, however, describe compositional differences associated with β-lg phenotype in established lactation only. No information is available on the first few weeks of lactation, when there are marked changes in the concentrations of β-lg and α-la (Pérez et al. 1990)
Remote sensing applications in forestry - The development of an earth resources information system using aerial photographs and digital computers Annual progress report
Earth resources information system using aerial photographs and digital computer
Objective Reconstructions of the Late Wisconsinan Laurentide Ice Sheet and the Significance of Deformable Beds
A three dimensional steady state plastic ice model; the present surface topography (on a 50 km grid); a recent concensus of the Late Wisconsinan maximum margin (PREST, 1984); and a simple map of ice yield stress are used to model the Laurentide Ice Sheet. A multi-domed, asymmetric reconstruction is computed without prior assumptions about flow lines. The effects of possible deforming beds are modelled by using the very low yield stress values suggested by MATHEWS (1974). Because of low yield stress (deforming beds) the model generates thin ice on the Prairies, Great Lakes area and, in one case, over Hudson Bay. Introduction of low yield stress (deformabie) regions also produces low surface slopes and abrupt ice flow direction changes. In certain circumstances large ice streams are generated along the boundaries between normal yield stress (non-deformable beds) and low yield stress ice (deformabie beds). Computer models are discussed in reference to the geologically-based reconstructions of SHILTS (1980) and DYKE ef al. (1982).À partir d'un modèle théorique tridimensionnel de plasticité de la glace, de la topographie actuelle (sur un canevas de 50 km2), du nouveau consensus quant à la limite maximale de la marge glaciaire (PREST, 1984) et d'une carte des seuils de plasticité de la glace, les auteurs ont élaboré des modèles de la calotte glaciaire laurentidienne. On a donc reconstitué par ordinateur une calotte asymétrique à dômes multiples, sans idée préconçue quant aux directions de l'écoulement des glaces. On a évalué les conséquences de la présence éventuelle de lits non résistants en se fondant sur les très bas seuils de plasticité de la glace proposés par MATHEWS (1974). En raison des bas seuils de plasticité (lits non résistants), les modèles démontrent qu'une glace peu épaisse couvrait les Prairies et la région des Grands Lacs, ainsi que la baie d'Hudson, dans un des deux cas. La prise en considération de régions à bas seuils de plasticité (lits non résistants) montre également la présence de pentes faibles et des changements brusques de direction de l'écoulement glaciaire. Dans certains cas, de grands courants glaciaires se manifestent le long des limites entre les endroits où les seuils de plasticité sont normaux (lits rigides) et les endroits où les seuils de plasticité sont bas (lits non résistants). Les modèles obtenus par ordinateur sont ensuite comparés aux reconstitutions de SHILTS (1980) et de DYKE et al. (1982), élaborées à partir des données géologiques.Ein dreidimensionales konstantes Modell der Eis-Plastizitat, die gegenwàrtige Oberflâchentopographie (auf einem Gitternetz von 50 km), ein neuer Konsensus ùber den maximalen glazialen Rand des spâten Wisconsin (PREST, 1984) und eine einfache Karte der Eis-Plastizitàts-Schwelle werden benutzt, um ein Modell der Laurentischen Eisdecke herzustellen. Eine vielfach gewôlbte, asymmetrische Rekonstruktion ist hergestellt worden, ohne vorgefapte Meinung ùber die Richtung des FlieBens. Die Wirkungen von môglicherweise vorhandenen nachgiebigen Betten werden mittels der sehr niedrigen Eisplastizitàtsschwelle, wie sie von MATHEWS (1974) vorgeschlagen wird, im Modell gestaltet. Wegen der niedrigen Plastizitâtsschwelle (nachgiebige Betten) zeigt das Modell dùnnes Eis in den Prairies, der Gegend der grofien Seen und in einem Fall ùber der Hudson Bay. Die Berùcksichtigung von Gebieten mit niedriger Plastizitàtsschwelle (nachgiebige Betten) fùhrt auch zu niedrigen Hàngen und abrupten Wechseln in der Richtung des EisflieBens. Unter gewissen Bedingungen bilden sich breite Eisstrôme entlang der Grenzèn zwischen Gegenden mit normaler Eisplastizitât (bestândige Betten) und geringer Eisplastizitàt (nachgiebige Betten). Durch Computer erstellte Modelle werden in Bezug auf die geologisch erarbeiteten Rekonstruktionen von SHILTS (1980) und DYKE et al. (1982) diskutiert
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