204,084 research outputs found
Kaptajn Per Møller Pedersens erindringer
No full textPer Møller Pedersen fødtes i Skagen i 1856. Hans fader var fisker og skipper, og erindringerne giver et levende indtryk afsåvel barndommens miljø som af fortællerens og hans et år yngre bror Anders' livsløb. Sammenholdet mellem »Ajes og Pier« går som en rød tråd gennem erindringerne, der samtidig illustrerer livet om bord i såvel sejl- som dampskibe i slutningen af 1800-årene og indtil efter 1. verdenskrig. I denne periode måtte en ung fremadstræbende sømand vælge mellem at være ejer og fører af et mindre sejlskib eller blive ansat som skibsfører i et rederi. Begge brødre synes at haveforetrukket det første, men de blev tvunget til at indse, at fremtiden tilhørte dampskibene. Erindringerne er nedskrevne af Per Møller Pedersen, efter at han som 68-årig var gået i land, og med tilladelse fra hans barnebarn, lods Per Fage-Pedersen, Helsingør, bringes de uforkortet i Handels- og Søfartsmuseets årbog
A Precision Measurement of the Weak Mixing Angle in Møller Scattering at Low Q₂
No full textThe electroweak theory has been probed to a high level of precision at the mass scale of the Zo through the joint contributions of LEP at CERN and the SLC at SLAC. The E158 experiment at SLAC complements these results by measuring the weak mixing angle at a Q2 of 0.026 (GeV/c)2, far below the weak scale.
The experiment utilizes a 48 GeV longitudinally polarized electron beam on unpolarized atomic electrons in a target of liquid hydrogen to measure the parity-violating asymmetry APV in Moller scattering.
The tree-level prediction for APV is proportional to 1-4sin2θW. Since sin2θW is approximately 0.25, the effect of radiative corrections is enhanced, allowing the E158 experiment to probe for physics effects beyond the Standard Model at the TeV scale.
This work presents the results from the first two physics runs of the experiment, covering data collected in the year 2002. The parity-violating asymmetry APV was measured to be APV = -158 ppb +/- 21 ppb (stat) +/- 17 ppb (sys). The result represents the first demonstration of parity violation in Moller scattering. The observed value of APV corresponds to a measurement of the weak mixing angle of sin2θWeff = 0.2380 +/- 0.0016 (stat) +/- 0.0013 (sys), which is in good agreement with the theoretical prediction of sin2θWeff = 0.2385 _+/- 0.0006 (theory).
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Photons and temporality in quantum electrodynamics
No full textThe lowest order processes described within quantum electrodynamics are free from the problem with infinities in the theory, and can be dealt with disregarding the need for charge and mass renormalization. This might indicate that the space-time description of these processes is not only consistent but also could give a privileged insight to the functioning of models provided by the theory. The Møller scattering is as R. P. Feynman considered, a prototype for the development of his rules of quantum electrodynamics and his overall space-time approach. The study of Møller scattering might then provide the most straightforward way to the understanding of the space-time description of interactions provide by quantum electrodynamics. This method is much less powerful than might be expected at first, pointing to the intrinsic limitations of the theory in what regards the modelling of the temporality in interaction processes
The Conceptual Framework for Business Process Innovation: Towards a Research Program on Global Supply Chain Intelligence
No full textThis paper proposes a research program on Business Process Innovation: Towards Global Supply Chain Intelligence. Few words are more ubiquitous in business or society today than "innovation". This reflects that businesses are striving for ways to survive and thrive in an increasingly complex and connected world (IBM 2006). Most industrial supply chains today are globally scattered and nearly all organizations rely on their Enterprise Information Systems (ES) for integration and coordination of their activities. In this context innovation inevitably is driven by advanced information technology. Organizations today are required not only to operate effective business processes but they also need to accommodate to changing business conditions at an increasing rate. Consequently the ability to develop and implement new processes driven by the Enterprise Information Systems is a central competence in most industries, and furthermore it is a critical practice for a global enterprise. The next practice in Global Supply Chain Management is Business Process Innovation. Business Process Innovation is the transformation of a global supply chain driven by a new advanced Enterprise Information Systems technology. This technology holds the potential to "close the control loop", but until now few organizations have managed to unleash the full potential of global supply chain intelligence. Thus, there is an emerging need for managing the transformation and for new approaches that will lead to robust global supply chains. This paper presents a conceptual framework for Business Process Innovation. A research proposal based on five interrelated topics is derived from the framework. The research program is intended to establish and to develop the conceptual framework for business process innovation and to apply this framework in a global supply chain context. These topics are presented in the following sections, but first the background for the program is discussed.No keywords;
Ventichthys Nielsen, Møller & Segonzac, 2006, gen. nov.
No full textVentichthys gen. nov. Type species Ventichthys biospeedoi n. sp. (type locality: South East Pacific Rise, 17º25.38’S, 113º12.29’W, 2586 m). Diagnosis An ophidiid genus with robust body; very small, overlapping scales on head and body; thick skin; posteriorly placed, enlarged kidneys; four lateral lines; dorsal fin origin above tip of pectorals; base of pelvic fin below hind margin of opercle; head broad with blunt snout; strong opercular spine covered by thick skin; upper jaw ends just behind eye; teeth granular, one median basibranchial tooth patch; anterior gill arch with 10-11 long rakers; number of rays in dorsal fin 80-89, caudal fin 8, anal fin 64-72, pelvic fin 2, pectoral fin 24-25; number of vertebrae 16-17 + 36 (in total 52-53). Similarity A phylogenetic analysis of the Ophidiidae needs to be made, but there are two genera, Benthocometes (Goode and Bean, 1886) and Petrotyx Heller and Snodgrass, 1903 that are similar to Ventichthys in having a blunt snout, no free pectoral fin rays, granular teeth, and one basibranchial tooth patch. The differences between the three genera are shown in Table 2. Etymology Vent refers to the hydrothermal vent and ichthys to fish.Published as part of Jørgen G. Nielsen, Peter Rask Møller & Michel Segonzac, 2006, Ventichthys biospeedoi n. gen. et sp. (Teleostei, Ophidiidae) from a hydrothermal vent in the South East Pacific., pp. 13-24 in Zootaxa 1247 on page 1
Indications for the presence of two populations of serotonin-containing pinealocytes in the pineal complex of the golden hamster (Mesocricetus auratus). An immunohistochemical study.
No full textSerotonin-like immunoreactivity was investigated in the pineal complex of the golden hamster by use of the indirect immunohistochemical technique. The superficial and deep portions of the pineal gland, and also the pineal stalk exhibited an intense cellular immunoreaction for serotonin. In addition, perivascular serotonin-immunoreactive nerve fibers were observed. Some serotonin-immunoreactive processes of the pinealocytes terminated on the surface of the ventricular lumen in the pineal and suprapineal recesses, indicating a receptive or secretory function of these cells. Several serotonin-immunoreactive processes connected the deep pineal with the habenular area. One week after bilateral removal of both superior cervical ganglia the serotonin immunoreaction of the entire pineal complex was greatly decreased. However, some cells in the pineal complex, of which several exhibited a neuron-like morphology, remained intensively stained after ganglionectomy. This indicates that the indoleamine content of some cells in the pineal complex of the golden hamster is independent of the sympathetic innervation
Shantysang i sejlskibenes sidste dage
No full textÅrbogens redaktion har ofte ønsket at bringe en artikel om de shanties, som blev sunget ombord på de gamle sejlskibe. Ved et heldigt tilfælde kom Handels- og Søfartsmuseet i forbindelse m,ed en gammel sejlskibssømand, som i sin ungdom har oplevet de hvide sejls sidste storhedstid og som var i stand til at fortælle om disse opsange. Tilmed kunne han huske teksterne til ni engelske shanties, som i denne form gengives her for første gang på tryk. De ledsagende noder er transskriberet efter hans sang, således som de af museet er optaget på bånd. H. T. Møller er født i København 1888
Observation of Parity Nonconservation in Møller Scattering
No full textWe report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A_(PV) = [-175 ± 30(stat)± 20(syst)] X 10^(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron’s weak charge at low energy Q^e_W = -0:053 ± 0:011. This is consistent with the standard model expectation at the current level of precision: sin^2θ_W = (M_Z)_(MS) = 0:2293 ± 0:0024(stat) ± 0:0016(syst) ± 0:0006(theory)
Double-box contributions to Møller scattering in the Standard Model
No full textThe paper investigates contributions of γ, Z, W and ghost intermediate states of box-type to the parity-violating Møller scattering asymmetry up to two-loop level. Using the Yennie–Frautschi–Suura factorization form for amplitudes, we demonstrate that QED corrections, with an exception of vacuum-polarization effects, cancel at the asymmetry level. We obtain chiral amplitudes at Born, one-loop and partially at two-loop level: ladder boxes and decorated boxes. Our calculations are relevant for the ultra-precise 11 GeV MØLLER experiment planned at Jefferson Laboratory. The numerical comparison of the two-loop contributions with the experimental accuracy of MØLLER is provided
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