Simulation of a method to directly image exoplanets around multiple stars systems

Direct imaging of extra-solar planets has now become a reality, especially with the deployment and commissioning of the first generation of specialized ground-based instruments such as the GPI, SPHERE, P1640 and SCExAO. These systems will allow detection of planets 1e7 times fainter than their host star. For space-based missions, such as EXCEDE, EXO-C, EXO-S, WFIRST-AFTA, different teams have shown in laboratories contrasts reaching 1e-10 within a few diffraction limits from the star using a combination of a coronagraph to suppress light coming from the host star and a wavefront control system. These demonstrations use a deformable mirror (DM) to remove residual starlight (speckles) created by the imperfections of telescope. However, all these current and future systems focus on detecting faint planets around a single host star or unresolved binaries/multiples, while several targets or planet candidates are located around nearby binary stars such as our neighbor star Alpha Centauri. Until now, it has been thought that removing the light of a companion star is impossible with the current technology, excluding binary star systems from target lists of direct imaging missions. Direct imaging around binaries or multiples systems at a level of contrast allowing Earth-like planets detection is challenging because the region of interest, where a dark zone is essential, is contaminated by the light coming from the host star's companion. We propose a method to simultaneously correct aberration sand diffraction of light coming from the target star. This method works even if the companion star is outside the control region of the DM (beyond its half-Nyquist frequency), by taking advantage of aliasing effects.Comment: 8 pages, 13 figures, SPIE Astronomical Telescope and Instrumentation conferenc

Síndrome hepatorrenal: Revisión de la literatura

El síndrome hepatorrenal (SHR) es una complicación frecuente y severa en pacientes con cirrosis hepática e hipertensión portal y se caracteriza por anormalidades circulatorias que llevan a vasoconstricción renal, generando insuficiencia renal funcional.Su fisiopatología ha sido estudiada y el pronóstico es reservado a menos que el paciente reciba trasplante hepático.El tratamiento medicamentoso con vasoconstrictores esplénicos es la esperanza futura de estos pacientes mientras acceden a trasplante hepático.El síndrome hepatorrenal (SHR) es una complicación frecuente y severa en pacientes con cirrosis hepática e hipertensión portal y se caracteriza por anormalidades circulatorias que llevan a vasoconstricción renal, generando insuficiencia renal funcional.Su fisiopatología ha sido estudiada y el pronóstico es reservado a menos que el paciente reciba trasplante hepático. El tratamiento medicamentoso con vasoconstrictores esplénicos es la esperanza futura de estos pacientesmientras acceden a trasplante hepático

Síndrome hepatorrenal: Revisión de la literatura

El síndrome hepatorrenal (SHR) es una complicación frecuente y severa en pacientes con cirrosis hepática e hipertensión portal y se caracteriza por anormalidades circulatorias que llevan a vasoconstricción renal, generando insuficiencia renal funcional.Su fisiopatología ha sido estudiada y el pronóstico es reservado a menos que el paciente reciba trasplante hepático.El tratamiento medicamentoso con vasoconstrictores esplénicos es la esperanza futura de estos pacientes mientras acceden a trasplante hepático.El síndrome hepatorrenal (SHR) es una complicación frecuente y severa en pacientes con cirrosis hepática e hipertensión portal y se caracteriza por anormalidades circulatorias que llevan a vasoconstricción renal, generando insuficiencia renal funcional.Su fisiopatología ha sido estudiada y el pronóstico es reservado a menos que el paciente reciba trasplante hepático. El tratamiento medicamentoso con vasoconstrictores esplénicos es la esperanza futura de estos pacientesmientras acceden a trasplante hepático

On the Concepts of Parallelism in Biomolecular Computing

In this paper we consider DNA and membrane computing, both as theoretical models and as problem solving devices. The basic motivation behind these models of natural computing is using parallelism to make hard problems tractable. In this paper we analyze the concept of parallelism. We will show that parallelism has very different meanings in these models.We introduce the terms ’or-parallelism’ and ’and-parallelism’ for these two basic types of parallelism

Configurable Aperture Space Telescope

In December 2014, we were awarded Center Innovation Fund to evaluate an optical and mechanical concept for a novel implementation of a segmented telescope based on modular, interconnected small sats (satlets). The concept is called CAST, a Configurable Aperture Space Telescope. With a current TRL is 2 we will aim to reach TLR 3 in Sept 2015 by demonstrating a 2x2 mirror system to validate our optical model and error budget, provide straw man mechanical architecture and structural damping analyses, and derive future satlet-based observatory performance requirements. CAST provides an alternative access to visible and/or UV wavelength space telescope with 1-meter or larger aperture for NASA SMD Astrophysics and Planetary Science community after the retirement of HS