Search Results - (Author, Cooperation:S. Frey)

2011-02-05

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Emotions ; Female ; *Happiness ; Health ; Humans ; *Longevity ; Longitudinal Studies ; Male

2014-07-06

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

2015-09-12

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Ecology/*economics

article

1997

Historische Pädagogik ; Demokratische Bildung ; Humanistische Pädagogik ; Medienwirkungsforschung ; Kinderbuch ; Unterrichtseinheit ; Unterrichtsmaterial ; Briefwechsel ; Fächerübergreifender Unterricht ; Latein ; Kunst ; Visuelle Kommunikation ; Ethische Erziehung ; Geistesgeschichte ; Humanismus ; Toleranz ; Religionsunterricht ; Evangelischer Religionsunterricht ; Reformation ; Ökumene ; Kalender ; Pädagoge ; Portrait ; Luther, Martin ; Melanchthon, Philipp

Lehren & lernen, Bd. 23 (1997) H. 2-3, 79 S., 0341-8294

German

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

Coherent control of the vibrational dynamics in crystalline polydiacetylene is demonstrated by tailoring the Stokes pulse of a coherent anti-Stokes Raman scattering (CARS) setup in a feedback-controlled self-learning loop. The feedback signal is derived from the spectral distribution of the CARS signal. Controlled excitation of one mode and simultaneous extinction of all other modes with high efficiency is demonstrated. In addition, the relative phases of the three normal modes have been controlled allowing excitations of local modes and suggesting the possibility of ground state reaction control. © 2002 American Institute of Physics.

Electronic Resource

1460-9568

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Although little is known about the contribution of the orbitofrontal cortex to the processing of new information in man, lesion studies in monkeys have suggested that it plays a critical role. The present study investigated changes in cerebral blood flow with positron emission tomography in normal human subjects during exposure to unpleasant auditory stimuli. The results indicated that the caudal orbitofrontal cortex, area 13, which is powerfully linked to the medial temporal limbic region and is involved in the regulation of autonomic responses, is a key part of the frontal cortex responding in the face of unpleasant incoming information.

Electronic Resource

1460-9568

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

There is considerable uncertainty regarding the cortical areas in the human brain that are involved in gustatory processing. Evidence from nonhuman primates indicates that parts of the peri-central opercular region (secondary somatosensory cortex) and insular cortex may be important for gustatory processing. The aim of the study was to examine changes in cerebral blood flow during gustatory stimulation (with sucrose or water) in the insulo-opercular region of the human brain with positron emission tomography using only movement of the tongue and mouth as control conditions. This is important because subtractions of responses to one gustatory stimulus from those to another may mask gustatory activity that is common to both stimuli, even when the control stimulus is an apparently tasteless one (e.g. water). Bilateral increases in activity were observed in the insulo-opercular region and, consistent with animal work, they indicate that there are a number of separate foci within this general area where primary gustatory inputs may be processed.

Electronic Resource

0005-2736

FRAP ; Fluorescence microscopy ; Langmuir-Blodgett film ; Membrane fusion ; Phospholipid bilayer, supported ; Total internal reflection

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Biology

Chemistry and Pharmacology

Medicine

Physics

Electronic Resource

0022-2364

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Physics

Electronic Resource

0022-328X

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Chemistry and Pharmacology

Electronic Resource

0006-291X

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Biology

Chemistry and Pharmacology

Physics

Electronic Resource

0273-1177

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Physics

Electronic Resource

1437-1596

Springer Online Journal Archives 1860-2000

Medicine

Law

Electronic Resource

1437-1596

Springer Online Journal Archives 1860-2000

Medicine

Law

Electronic Resource

1432-0630

PACS: 68.55.-a; 81.15.Ef; 82.65.My; 82.65.Jv

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Physics

Electronic Resource

1430-2772

Springer Online Journal Archives 1860-2000

Psychology

Zusammenfassung 3 Experimente wurden durchgeführt, in denen die Versuchspersonen (39 Studenten) aufgefordert wurden, die ihnen am „angenehmsten“ erscheinende Entfernung zu verschiedenen Reizobjekten zu wählen. Es zeigte sich, daß die Versuchspersonen näher an Personen als an Fotografien von Personen oder Gegenständen herangingen. Männliche Versuchspersonen gingen näher an weibliche als an männliche Reizpersonen heran. Es bestand außerdem die Tendenz einer größeren Annäherung an Personen, wenn diese die Versuchsperson anblickten. Die „angenehmste“ Entfernung war individuell verschieden und über mehrere Wochen stabil. Sie war außerdem vom räumlichen Bezugssystem abhängig; in diesem Zusammenhang konnte die Ausbildung von Einstellungen gezeigt werden. Die Ergebnisse wurden im Hinblick auf ein Gleichgewichtsmodell sozialer Kräfte von Argyle u. Dean diskutiert.

Summary Three experiments were conducted in which subjects (39 students) were to choose the distance from various stimulus objects which appeared “most comfortable” to them. It was shown that subjects approached actual persons more closely than they did photographs of persons or objects. Male subjects approached female stimulus objects more closely than they did males. There was a tendency of greater approach if the stimulus persons gazed at the subjects. The “most comfortable” distance was specific for the individual and remained stable over a period of several weeks. It also depended upon the spatial frame of reference; in this connection the development of sets could be shown. The results were discussed in relation to a model for the equilibrium of social forces from Argyle and Dean.

Electronic Resource

0992-7689

Tomography ; Aurora ; EISCAT ; Ionosphere ; Conductivity

Springer Online Journal Archives 1860-2000

Geosciences

Physics

Abstract Tomographic reconstruction of the three-dimensional auroral are emission is used to obtain vertical and horizontal distributions of the optical auroral emission. Under the given experimental conditions with a very limited angular range and a small number of observers, algebraic reconstruction methods generally yield better results than transform techniques. Different algebraic reconstruction methods are tested with an auroral are model and the best results are obtained with an iterative least-square method adapted from emission-computed tomography. The observation geometry used during a campaign in Norway in 1995 is tested with the are model and root-mean-square errors, to be expected under the given geometrical conditions, are calculated. Although optimum geometry was not used, root-mean-square errors of less than 2% for the images and of the order of 30% for the distribution could be obtained. The method is applied to images from real observations. The correspondence of original pictures and projections of the reconstructed volume is discussed, and emission profiles along magnetic field lines through the three-dimensionally reconstructed arc are calibrated into electron density profiles with additional EISCAT measurements. Including a background profile and the temporal changes of the electron density due to recombination, good agreement can be obtained between measured profiles and the time-sequence of calculated profiles. These profiles are used to estimate the conductivity distribution in the vicinity of the EISCAT site. While the radar can only probe the ionosphere along the radar beam, the three-dimensional tomography enables conductivity estimates in a large area around the radar site.

Electronic Resource

1432-1114

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Abstract A full-field planar optical diagnostic technique for studying mixing in swirling flows is described. Results were obtained using this technique to provide planar mixing information by seeding a simulated fuel stream with aluminum oxide particles, then inferring concentration from Mie scattering intensity distributions. This facility and measurement technique are unique for several reasons. First, they allow spatial variations in laser sheet energy to be corrected for on a shot-to-shot basis. Second, they allow experiments to be performed for swirlers with practical fuel and oxidizer flow rates, i.e. on the order of 150 g/s (0.33 lbm/s). Finally, they allow full size swirler models to be evaluated, with the entire exit plane imaged simultaneously. Representative results are presented as false color images of the planar mixing fields. These images allow rapid assessment of the mixing process and its changes with variations in operating conditions or swirler geometry.

Electronic Resource

1432-0924

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Abstract The present work studies the finite element approximation for the heat transfer process in an opaque three-dimensional plate with a temperature-dependent source dominating the conductive operator. The adopted mechanical model assumes the existence of a heat transfer from/to the plate following Newton's law of cooling. The numerical simulations performed have attested the instability of the classical Galerkin method when subjected to very high source-dominated regimen. Usual strategies in the Engineering practice of dealing with this shortcoming proved to be inefficient. A Gradient-Galerkin/Least-Squares formulation was adopted in the numerical simulations as a remedy for the Galerkin's instability when subjected to those regimen.

Electronic Resource

1573-5036

nitrogen fixation ; nodule occupancy ; Phaseolus vulgaris ; Rhizobium leguminosarum bv.phaseoli ; soil acidity ; strain competition

Springer Online Journal Archives 1860-2000

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Abstract The effect of soil pH on the competitive abilities of twoRhizobium leuminosarum bv.phaseoli type I and one type II strains was examined in a nonsterile soil system.Phaseolus vulgaris seedlings, grown in unlimed (pH 5.2) or limed (pH 7.6) soil, were inoculated with a single-strain inoculum containing 1 × 106 cells mL−1 of one of the three test strains or with a mixed inoculum (1:1, type I vs. type II) containing the type II strain CIAT 899 plus one type I strain (TAL 182 or CIAT 895). At harvest, nodule occupants were determined. In a separate experiment, a mixed suspension (1:1, type I vs. type II) of CIAT 899 paired with either TAL 182 or CIAT 895 was used to inoculateP. vulgaris seedlings grown in sterile, limed or unlimed soil. The numbers of each strain in the rhizosphere were monitored for 10 days following inoculation. The majority of nodules (〉 60%) formed on plants grown in acidic soil were occupied by CIAT 899, the type II strain. This pattern of nodule occupancy changed in limed soil. When CIAT 899 was paired with TAL 182, the type I strain formed 78% of the nodules. The number of nodules formed by CIAT 899 and CIAT 895 (56% and 44%, respectively) were not significantly different. The observed patterns of nodule occupancy were not related to the relative numbers or specific growth rates of competing strains in the host rhizosphere prior to nodulation. The results indicate that soil pH can influence which symbiotype ofR. leguminosarum bv.phaseoli will competitively nodulateP. vulgaris.

Electronic Resource