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Search Results: 1 - 10 of 8192 matches for " JOSE; "
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Revisiting the Classics to Recover the Physical Sense in Electrical Noise  [PDF]
Jose-Ignacio Izpura
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.26055
Abstract: This paper shows a physically cogent model for electrical noise in resistors that has been obtained from Thermodynamical reasons. This new model derived from the works of Johnson and Nyquist also agrees with the Quantum model for noisy systems handled by Callen and Welton in 1951, thus unifying these two Physical viewpoints. This new model is a Complex or 2-D noise model based on an Admittance that considers both Fluctuation and Dissipation of electrical energy to excel the Real or 1-D model in use that only considers Dissipation. By the two orthogonal currents linked with a common voltage noise by an Admittance function, the new model is shown in frequency domain. Its use in time domain allows to see the pitfall behind a paradox of Statistical Mechanics about systems considered as energy-conserving and deterministic on the microscale that are dissipative and unpredictable on the macroscale and also shows how to use properly the Fluctuation-Dissipation Theorem.
Parallel Evaluation of a Spatial Traversability Cost Function on GPU for Efficient Path Planning  [PDF]
Stephen Cossell, Jose Guivant
Journal of Intelligent Learning Systems and Applications (JILSA) , 2011, DOI: 10.4236/jilsa.2011.34022
Abstract: A parallel version of the traditional grid based cost-to-go function generation algorithm used in robot path planning is introduced. The process takes advantage of the spatial layout of an occupancy grid by concurrently calculating the next wave front of grid cells usually evaluated sequentially in traditional dynamic programming algorithms. The algorithm offers an order of magnitude increase in run time for highly obstacle dense worst-case environments. Efficient path planning of real world agents can greatly increase their accuracy and responsiveness. The process and theoretical analysis are covered before the results of practical testing are discussed.
On the Absence of Carrier Drift in Two-Terminal Devices and the Origin of Their Lowest Resistance Per Carrier Rk=h/Q2  [PDF]
Jose Ignacio Izpura
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.38100
Abstract: After a criticism on today’s model for electrical noise in resistors, we pass to use a Quantum-compliant model based on the discreteness of electrical charge in a complex Admittance. From this new model we show that carrier drift viewed as charged particle motion in response to an electric field is unlike to occur in bulk regions of Solid-State devices where carriers react as dipoles against this field. The absence of the shot noise that charges drifting in resistors should produce and the evolution of the Phase Noise with the active power existing in the resonators of L-C oscillators, are two effects added in proof for this conduction model without carrier drift where the resistance of any two-terminal device becomes discrete and has a minimum value per carrier that is the Quantum Hall resistance Rk=h/q2 Ω
Laparoscopic Extraperitoneal Inguinal Hernia Repair Using a Novel Mesh with Self-Fixating Properties  [PDF]
Jose Erbella, Alexander Erbella
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.46056
Abstract:

Laparoscopic totally extraperitoneal (TEP) hernia repair is a well-accepted technique for inguinal hernia repair. Different types of mesh and fixation methods have been described. Recently, a novel, self-fixating mesh has been introduced and used successfully in open inguinal hernia repairs. We report the first initial experience using this mesh for TEP repairs.

Exchange Rates, Macroeconomic Fundamentals and Risk Aversion  [PDF]
Ricardo Laborda, Jose Olmo
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.46047
Abstract:

This paper proposes a theoretical model for determining the exchange rate based on the interaction between international bond markets with different maturities. The model accommodates the presence of risk premia between short- and long-term bonds. The difference in risk premium between international bond markets produces imbalances between their yields and is responsible for the differences in equilibrium between the future spot exchange rate and the corresponding forward price. These departures from the expectations hypothesis of the international term structure of interest rates lead to unintended effects on the efficacy of monetary policy in open economies. The existence of imbalances in the risk premium between countries can be considered by monetary authorities as an alternative tool for conducting monetary policy and boosting real output.

The False Problem of the Maintenance of Sex (Review of the Original Approach)  [PDF]
Jose Maria Mancebo Quintana
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.519297
Abstract: We analyze here the keys of the original approach about the twofold cost: the return to the asexuality starting with a mutant female, with the same reproductive capacity than a sexual one, and with double genetic-reproductive success. We propose a new approach in which 1) all individuals in a population have regulatory mechanisms of reproductive mode, and when such change occurs, it happens in all its population at the same time; 2) after a change of reproductive mode in the population there can be variations in average offspring per female, according to the environmental quality; and 3) the genetic-reproductive success of the males and its unequal paternity success are accounted for. Results: The most advantageous reproductive strategy depends on the demographic situation of the population and the degree of the unequal paternity success of males. For harem values observed in nature and in populations with moderate growth rate, stable or decreasing population, the sexual strategy is advantageous. If the population growth rate is high, the asexual strategy is advantageous. In species subject to high demographic fluctuations the best strategy depends on the ability to predict the time of occurrence of the population bottleneck: if predictable, the best strategy is the alternation of generations, if not, permanent parthenogenesis.
New Epistemological and Methodological Criteria for Communication Sciences: The Conception as Applied Sciences of Design  [PDF]
Maria Jose Arrojo
Open Journal of Philosophy (OJPP) , 2015, DOI: 10.4236/ojpp.2015.51002
Abstract: There is a need for new epistemological and methodological criteria for communication sciences. This necessity is underscored by the important developments of communication in recent years, due to the information and communication technologies (ICT). Consequently, we should overcome interpretive schemes until now dominant, which see communication sciences only as social sciences (or even as it were a mere professional practice based on past experience). Hence, the reality of a new conception is required to specify communication sciences which are analyzed as applied sciences of design. Thus, the theoretical approach—in cognitive and processes—fits best to the reality of new communication phenomena. Within this novel framework, which deals with the current reality and the future projection of the communication sciences, the conception of them as applied sciences of design can follow several steps in order to present its characterization: 1) the scope proposed to do research regarding communicative phenomena; 2) communication science as applied disciplines (subjects focus to solve specific problems) that work on designs (they seek to enlarge the human potential communication); and 3) the new criteria that carry out this proposal about the epistemology and methodology of communication sciences (where the knowledge used in the designs is oriented toward artificial aims and, consequently, the processes will follow the lead of the designs in order to obtain the expected results).
Electrical Noise, Brownian Motion and the Arrow of Time  [PDF]
Jose-Ignacio Izpura
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.62018
Abstract: The origin of the Johnson noise of resistors is reviewed by a new model fitting in the Fluctuation-Dissipation framework and compared with the velocity noise in Brownian motion. This new model handling both fluctuations as well as dissipations of electrical energy in the Complex Admittance of any resistor excels current model based on the dissipation in their conductance. From the two orthogonal currents associated to a sinusoidal voltage in an electrical admittance, the new model that also considers the discreteness of the electrical charge shows a Cause-Effect dynamics for electrical noise. After a brief look at systems considered as energy-conserving and deterministic on the microscale that are dissipative and unpredictable on the macroscale, the arrow of time is discussed from the noise viewpoint.
Two Stream Instability as a Source of Coronal Heating  [PDF]
Antony Soosaleon, Blesson Jose
International Journal of Astronomy and Astrophysics (IJAA) , 2015, DOI: 10.4236/ijaa.2015.52009
Abstract: Recent observation of oscillating the two stream instability (TSI) in a solar type III radio bursts and spatial damping of Langmuir oscillations has made this instability as an important candidate to understand the coronal heating problem. This instability has been studied by several authors for cold plasma found to be stable for high frequencies (greater than plasma frequency ωp). In this paper, we prove that this instability is unstable for warm plasma for higher frequencies (greater than plasma frequency ωp) and much suitable to study the solar coronal heating problem. We have derived a general dispersion relation for warm plasma and discussed the various methods analyzing the instability conditions. Also, we derived an expression for the growth rate of TSI and analyzed the growth rate for photospheric and coronal plasmas. A very promising result is that the ion temperature is the source of this instability and shifts the growth rate to high frequency region, while the electron temperature does the reverse. TSI shows a high growth rate for a wide frequency range for photosphere plasma, suggesting that the electron precipitation by magnetic reconnection current, acceleration by flares, may be source of TSI in the photosphere. But for corona, these waves are damped to accelerate the ions and further growing of such instability is prohibited due to the high conductivity in coronal plasma. The TSI is a common instability; the theory can be easily modifiable for multi-ion plasmas and will be a useful tool to analyze all the astrophysical problems and industrial devices, too.
Exact Propagator of a Two Dimensional Anisotropic Harmonic Oscillator in the Presence of a Magnetic Field  [PDF]
Jose M. Cerveró
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.84032
Abstract: In this paper we solve exactly the problem of the spectrum and Feynman propagator of a charged particle submitted to both an anharmonic oscillator in the plane and a constant and homogeneous magnetic field of arbitrary strength aligned with the perpendicular direction to the plane. As we shall see in the beginning of the letter, the Hamiltonian, being a quadratic form, is easily diagonalizable and the Classical Action can be used to construct the exact Feynman Propagator using the Stationary Phase Approximation. The result is useful for the treatment of quasi two dimensional samples in the field of magnetic effects in nano-structures and quantum optics. The presented solution, after minor extensions, can also be used for motion in three dimensions, and in fact it has been used for years in such cases. Also it can be used as a good exercise of a Feynman Path Integral that can be calculated easily with just the help of the Classical Action.
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