192 research outputs found
Simulation of Heart Rate Variability Model in a Network
No full textWe consider a 1-D model for the simulation of the blood flow in the cardiovascular system. As inflow condition we
consider a model for the aortic valve. The opening and closing of the valve is dynamically determined by the pressure difference
between the left ventricular and aortic pressures. At the outflow we impose a peripheral resistance model. To approximate the
solution we use a numerical scheme based on the discontinuous Galerkin method. We also considering a variation in heart rate and
terminal reflection coefficient due to monitoring of the pressure in the network
J-self-adjointness of a class of Dirac-type operators
No full textAbstractIn this note, we prove that the maximally defined operator associated with the Dirac-type differential expression M(Q)=iddxIm−Q−Q∗−ddxIm, where Q represents a symmetric m×m matrix (i.e., Q(x)⊤=Q(x) a.e.) with entries in L1loc(R), is J-self-adjoint, where J is the antilinear conjugation defined by J=σ1C, σ1=0ImIm0 and C(a1,…,am,b1,…,bm)⊤=(a1,…,am,b1,…,bm)⊤. The differential expression M(Q) is of significance as it appears in the Lax formulation of the non-abelian (matrix-valued) focusing nonlinear Schrödinger hierarchy of evolution equations
EVALUATING THE BENEFITS OF PROVIDING ARCHIVED ONLINE LECTURES TO IN-CLASS MATH STUDENTS
No full textThe present study examines the impact of the online archiving system developed at the University of Colorado at Colorado Springs on the in-class students enrolled in traditional math courses. A web survey has been designed for collecting data on potential changes in attitudes and behaviors (such as study habits), on the dynamics of professor-student relation, and on overall student performance enhancement. The results indicate that the presence of the archived lectures and lecture notes adds significant value to the learning process with notable improvements in the perceived student performance and overall experience in the class.</jats:p
The Cuntz algebra Q_N and C*-algebras of product systems
No full textWe consider a product system over the multiplicative group semigroup N^x of Hilbert bimodules which is implicit in work of S. Yamashita and of the second named author. We prove directly, using universal properties, that the associated Nica-Toeplitz algebra is an extension of the C*-algebra Q_N introduced recently by Cuntz
A Bluetooth Solution for Public Information Systems
No full textThis paper gives insights into the opportunities offered by the Bluetooth technology. Bluetooth advertising proves to be a cheap and strong tool for enriching and improving the experience offered by a public transport system, by delivering dense and essential information about topics of interest. Alongside the Java platform, new applications can be designed and implemented to make use of the already available Bluetooth technology incorporated in devices in the target public’s custody. The paper sets focus on the segment of ready to be made available content regarding general information about the routes and timetables of the vehicles integrated in a public transport system.Public Transport, Bluetooth, Java, Mobile Device
The Cuntz algebra Q_N and C*-algebras of product systems
No full textWe consider a product system over the multiplicative group semigroup N^x of Hilbert bimodules which is implicit in work of S. Yamashita and of the second named author. We prove directly, using universal properties, that the associated Nica-Toeplitz algebra is an extension of the C*-algebra Q_N introduced recently by Cuntz
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