108,137 research outputs found
Abnormal Myocardial Blood Flow Reserve Observed in Cardiac Amyloidosis
We performed real-time myocardial contrast echocardiography on a patient with cardiac amyloidosis and previous normal coronary angiography presenting with atypical chest pain to assess myocardial blood flow reserve (MBFR). Myocardial contrast echocardiography was performed and flash microbubble destruction and replenishment analysis was used to calculate myocardial blood flow. Dipyridamole was used to achieve hyperemia. MBFR was derived from the ratio of peak myocardial blood flow at hyperemia and rest. The results show a marked reduction in MBFR in our patient. Previous reports of luminal obstruction of intramyocardial rather than epicardial vessels by amyloid deposition may be causing microvascular dysfunction
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Inference under progressively type II right censored sampling for certain lifetime distributions
In this paper, estimation of the parameters of a certain family of two-parameter lifetime
distributions based on progressively Type II right censored samples (including ordinary Type II right censoring) is studied. This family, of reverse hazard distributions, includes the Weibull, Gompertz and Lomax distributions. A new type of parameter estimation, named inverse estimation, is introduced for both parameters. Exact confidence intervals for one of the parameters and generalized confidence intervals for the other are explored; inference for the first parameter can be accomplished by our
methodology independently of the unknown value of the other parameter in this family of distributions. Derivation of the estimation method uses properties of order statistics.
A simulation study in the particular context of the Weibull distribution illustrates the accuracy of these confidence intervals and compares inverse estimators favorably with maximum likelihood estimators. A numerical example is used to illustrate the proposed procedures
Computer graphics data conditioning
Graphics data conditioning program expedites engineering analysis of flight data and ensures timely correction of measurement errors. By adding interactive computer graphic displays to existing data conditioning programs, computational results are immediately visible, enabling on-line intervention and control of computer processing
Orbiting Geophysical Observatory Attitude Control Subsystem Design Survey. NASA/ERC Design Criteria Program, Guidance and Control
This design survey summarizes the history of the Orbiting Geophysical Observatories' (OGO) Attitude Control Subsystem (ACS) from the proposal phase through current flight experience. Problems encountered in design, fabrication, test, and on orbit are discussed. It is hoped that the experiences of the OGO program related here will aid future designers
EU pension reform - An overview of the debate and an empirical assessment of the main policy reform options
This paper on European Union (EU) pension reform provides an overview of the debate and, on the basis of a series of model simulations, makes an empirical assessment of the main pension policy reform options at the EU, not the Member State, level. It estimates what it would take to bring the public PAYG pension system back into equilibrium and assesses the case for a shift to funding. The main conclusion of this paper is that the EU pension system should in the very long run (i.e. over more than one generation) be fully funded, with this being achieved using a two-stage optimal transition path. Stage one of this transition process should concentrate on stabilising the PAYG system and achieving a partial shift to funding, with stage two only occurring once circumstances permit. The fully funded system, once established, should have public and private pillars, with the public system in effect replacing the old PAYG system with a similar compulsory, defined benefit, system and with the private pillar being a voluntary, defined contribution, system.pension reform, policy reform options, ageing model, Mc Morrow, Rïżœger,
A study of dynamics of magma extrusion and investigation of volcanic vapor Final report, 25 Mar. 1966 - 30 Jun. 1967
Modified heat flow model for magma extrusion and volcanic vapo
Orbiting Geophysical Observatory Attitude Control Subsystem design survey
Development history and design modifications for attitude control subsystem of OG
Limit theorems for a localization model of 2-state quantum walks
We consider 2-state quantum walks (QWs) on the line, which are defined by two
matrices. One of the matrices operates the walk at only half-time. In the usual
QWs, localization does not occur at all. However, our walk can be localized
around the origin. In this paper, we present two limit theorems, that is, one
is a stationary distribution and the other is a convergence theorem in
distribution.Comment: International Journal of Quantum Information, Vol.9, No.3, pp.863-874
(2011
Saturn integrated circuit reliability test program Final report, 28 Jun. 1966 - 1 Jul. 1967
Literature survey and test program to study reliability of linear integrated circuit
Advanced superalloy protection systems evaluation Final report
Metalliding parameters developed for sequential deposition of manganese, aluminum, and tantalum alloys as protective coatings for superalloy
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