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Search Results: 1 - 10 of 220348 matches for " C. Neumann "
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Standardization of a computerized method for calculating autonomic function test responses in healthy subjects and patients with diabetes mellitus
Neumann C.,Schmid H.
Brazilian Journal of Medical and Biological Research , 1997,
Abstract: The objectives of the present study were 1) to compare results obtained by the traditional manual method of measuring heart rate (HR) and heart rate response (HRR) to the Valsalva maneuver, standing and deep breathing, with those obtained using a computerized data analysis system attached to a standard electrocardiograph machine; 2) to standardize the responses of healthy subjects to cardiovascular tests, and 3) to evaluate the response to these tests in a group of patients with diabetes mellitus (DM). In all subjects (97 healthy and 143 with DM) we evaluated HRR to deep breathing, HRR to standing, HRR to the Valsalva maneuver, and blood pressure response (BPR) to standing up and to a sustained handgrip. Since there was a strong positive correlation between the results obtained with the computerized method and the traditional method, we conclude that the new method can replace the traditional manual method for evaluating cardiovascular responses with the advantages of speed and objectivity. HRR and BPR of men and women did not differ. A correlation between age and HRR was observed for standing (r = -0.48, P<0.001) and deep breathing (r = -0.41, P<0.002). Abnormal BPR to standing was usually observed only in diabetic patients with definite and severe degrees of autonomic neuropathy.
The elliptic genus of Calabi-Yau 3- and 4-folds, product formulae and generalized Kac-Moody algebras
C. D. D. Neumann
Physics , 1996, DOI: 10.1016/S0393-0440(98)00015-1
Abstract: In this paper the elliptic genus for a general Calabi-Yau fourfold is derived. The recent work of Kawai calculating N=2 heterotic string one-loop threshold corrections with a Wilson line turned on is extended to a similar computation where K3 is replaced by a general Calabi-Yau 3- or 4-fold. In all cases there seems to be a generalized Kac-Moody algebra involved, whose denominator formula appears in the result.
Perturbative BPS-algebras in superstring theory
C. D. D. Neumann
Physics , 1997, DOI: 10.1016/S0550-3213(97)00360-X
Abstract: This paper investigates the algebraic structure that exists on perturbative BPS-states in the superstring, compactified on the product of a circle and a Calabi-Yau fourfold. This structure was defined in a recent article by Harvey and Moore. It shown that for a toroidal compactification this algebra is related to a generalized Kac-Moody algebra. The BPS-algebra itself is not a Lie-algebra. However, it turns out to be possible to construct a Lie-algebra with the same graded dimensions, in terms of a half-twisted model. The dimensions of these algebras are related to the elliptic genus of the transverse part of the string algebra. Finally, the construction is applied to an orbifold compactification of the superstring.
Changes to Euchromatin on LAT and ICP4 Following Reactivation Are More Prevalent in an Efficiently Reactivating Strain of HSV-1
Clinton C. Creech,Donna M. Neumann
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0015416
Abstract: Epigenetic mechanisms, via post-translational histone modifications, have roles in the establishment and maintenance of latency of the HSV-1 genome in the sensory neurons. Considering that many post-translational histone marks are reversible in nature, epigenetic mechanisms may also play a critical role in the process of induced HSV-1 reactivation.
Responsabilidade Social e a Demonstra o do Valor Adicionado
César Eduardo Stevens Kroetz,Marguit Neumann
Desenvolvimento em Quest?o , 2008,
Abstract: The companies are considered fundamental and strategical components for the economical, environmental and social development. Therefore, the contemporary society has demanded answers from these organizations regarding to their commitment with the economical development and with the social and environmental responsibilities. That provoked in the business class the necessity to propose demonstrations to present the organizational contribution regarding its generation and wealth distribution. This study has the objective to ponder and introduce a discussion about this issue, approaching aspects related with the social responsibility, the theory of the stake holders, the economical and accounting added value and the demonstration of the added value.
The Aharonov-Bohm effect: the role of tunneling and associated forces
G. C. Hegerfeldt,J. T. Neumann
Mathematics , 2008, DOI: 10.1088/1751-8113/41/15/155305
Abstract: Through tunneling, or barrier penetration, small wavefunction tails can enter a finitely shielded cylinder with a magnetic field inside. When the shielding increases to infinity the Lorentz force goes to zero together with these tails. However, it is shown, by considering the radial derivative of the wavefunction on the cylinder surface, that a flux dependent force remains. This force explains in a natural way the Aharonov-Bohm effect in the idealized case of infinite shielding.
Graphene-based charge sensors
C. Neumann,C. Volk,S. Engels,C. Stampfer
Physics , 2013, DOI: 10.1088/0957-4484/24/44/444001
Abstract: We discuss graphene nanoribbon-based charge sensors and focus on their functionality in the presence of external magnetic fields and high frequency pulses applied to a nearby gate electrode. The charge detectors work well with in-plane magnetic fields of up to 7 T and pulse frequencies of up to 20 MHz. By analyzing the step height in the charge detector's current at individual charging events in a nearby quantum dot, we determine the ideal operation conditions with respect to the applied charge detector bias. Average charge sensitivities of 1.3*10^-3 e/sqrt{Hz} can be achieved. Additionally, we investigate the back action of the charge detector current on the quantum transport through a nearby quantum dot. By setting the charge detector bias from 0 to 4.5 mV, we can increase the Coulomb peak currents measured at the quantum dot by a factor of around 400. Furthermore, we can completely lift the Coulomb blockade in the quantum dot.
Back action of graphene charge detectors on graphene and carbon nanotube quantum dots
C. Volk,S. Engels,C. Neumann,C. Stampfer
Physics , 2015,
Abstract: We report on devices based on graphene charge detectors (CDs) capacitively coupled to graphene and carbon nanotube quantum dots (QDs). We focus on back action effects of the CD on the probed QD. A strong influence of the bias voltage applied to the CD on the current through the QD is observed. Depending on the charge state of the QD the current through the QD can either strongly increase or completely reverse as a response to the applied voltage on the CD. To describe the observed behavior we employ two simple models based on single electron transport in QDs with asymmetrically broadened energy distributions of the source and the drain leads. The models successfully explain the back action effects. The extracted distribution broadening shows a linear dependency on the bias voltage applied to the CD. We discuss possible mechanisms mediating the energy transfer between the CD and QD and give an explanation for the origin of the observed asymmetry.
Dependence of the thioxanthone triplet-triplet absorption spectrum with solvent polarity and aromatic ring substitution
Ferreira, Giovana C.;Schmitt, Carla C.;Neumann, Miguel G.;
Journal of the Brazilian Chemical Society , 2006, DOI: 10.1590/S0103-50532006000500013
Abstract: the triplet-triplet (tt) and transient absorptions of non-substituted and substituted thioxanthones has been studied in different solvents in order to ascertain the effect of the solvent, as well as the substituents on the aromatic ring. spectra taken after a couple of ms after the flash show three main transient absorptions due to the triplet state (600-650 nm), the thioxanthone ketyl radical (~450 nm) and an overlap of both (~300 nm). the amount of radicals formed in non hydroxylic solvents is much lower than in alcohols. the maxima of the tt absorption peaks show a good correlation with the et(30) solvent parameter.
Personality of Students of Economics, Medicine, and Verbal Communication: Preliminary Results  [PDF]
J. Richter, R. Neumann
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.23039
Abstract: Differences on personality between students of economics, medicine and verbal communication should be explored by means of the Temperament and Character Inventory. Students of economics are mainly characterized by lower harm avoidance and lower reward dependence and higher self directedness than medical students and students of verbal communication. Students of all groups seem to overestimate their self-directedness with economical students showing the most pronounced tendency of overrating, whereas medical students tend to overrate their cooperativeness more than the students from the other groups. The obvious disturbed self-evaluation corresponds to the students’ professional orientation. The students can be characterized by specific and varying types and impact of social desirability depending on their professional career.
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