23,586 research outputs found
BENJAMIN CONSTANT AND THE PRINCIPES DE POLITIQUE
No full textopenQUESTO LAVORO FORNISCE UNA PANORAMICA SUL PENSIERO POLITICO DI BENJAMIN CONSTANT, PARTENDO DALL'OPERA DEL 1815 "PRINCIPES DE POLITIQUE APPLICABLES A TOUS LES GOUVERNEMENT".
NEL PRIMO CAPITOLO SONO ESPOSTI ALCUNI DATI BIOGRAFICI RIGUARDO ALL'AUTORE, NEL SECONDO CAPITOLO VIENE PRESENTATO IL PENSIERO DI CONSTANT RIGUARDO ALLA COSTITUZIONE, NEL TERZO CAPITOLO SONO PRESENTANTI I POTERI FONDAMENTALI CHE L'AUTORE TRATTA, NEL QUARTO CAPITOLO VIENE PRESENTATO IL PENSIERO DELL'AUTORE RIGUARDO ALLA SOCIETA' E, NELL'ULTIMO CAPITOLO, SI TROVANO ALCUNI CONFRONTI TRA BENJAMIN CONSTANT ED ALTRI AUTORI, COME ROUSSEAU E MONTESQUIEU.THIS WORK PROVIDES AN OVERVIEW OF BENJAMIN CONSTANT'S POLITICAL THOUGHT, STARTING FROM THE 1815 WORK "PRINCIPES DE POLITIQUE APPLICABLES A TOUS LES GOUVERNEMENT".
IN THE FIRST CHAPTER SOME BIOGRAPHICAL DATA ABOUT THE AUTHOR ARE PRESENTED, IN THE SECOND CHAPTER CONSTANT'S THOUGHT ON THE CONSTITUTION IS PRESENTED, IN THE THIRD CHAPTER THE FUNDAMENTAL POWERS THAT THE AUTHOR DEALS WITH ARE PRESENTED, IN THE FOURTH CHAPTER THERE IS THE AUTHOR'S THOUGHT ABOUT SOCIETY AND, IN THE LAST CHAPTER, THERE ARE SOME COMPARISONS BETWEEN BENJAMIN CONSTANT AND OTHER AUTHORS, LIKE ROUSSEAU AND MONTESQUIEU
Constant market shares analysis: uses, limitations and prospects
No full textIn this paper, we generalise the constant market shares (CMS) framework, with particular attention to the underlying theoretical conditions required for diagnostic interpretation. The approach is applied to the analysis of the export performance of the Australian processed food sector in South-East Asia over the period 1980–2003. We conclude that the usefulness of CMS analysis for evaluating a country’s international trade performance depends upon the empirical validity of the aggregation assumptions implicit in the diagnostic interpretation.aggregation, Armington model, competitiveness, constant market shares, Marketing,
Kemeny's constant and the effective graph resistance
No full textKemeny's constant and its relation to the effective graph resistance has been established for regular graphs by Palacios et al. [1]. Based on the Moore–Penrose pseudo-inverse of the Laplacian matrix, we derive a new closed-form formula and deduce upper and lower bounds for the Kemeny constant. Furthermore, we generalize the relation between the Kemeny constant and the effective graph resistance for a general connected, undirected graph.Accepted Author ManuscriptMathematical PhysicsNetwork Architectures and Service
Limit Theorem for a Modified Leland Hedging Strategy under Constant Transaction Costs rate
No full textWe study the Leland model for hedging portfolios in the presence of a constant proportional transaction costs coefficient. The modified Leland's strategy recently defined by the second author, contrarily to the classical one, ensures the asymptotic replication of a large class of payoff. In this setting, we prove a limit theorem for the deviation between the real portfolio and the payoff. As Pergamenshchikov did in the framework of the usual Leland's strategy, we identify the rate of convergence and the associated limit distribution. This rate turns out to be improved using the modified strategy and non periodic revision dates.Asymptotic hedging ; Leland-Lott strategy ; Transaction costs ; Martingale limit theorem.
Desudaboides fletcheri Constant, 2010, n. sp.
No full textDesudaboides fletcheri n. sp. Figs. 1 A–B, 5. Etymology. fletcheri: dedicated to my friend, Dr Murray J. Fletcher who sent the only known specimen for study and always kindly supported the work of the author. Material examined. Holotype Ƥ: [East Ballina, N.S.W, 10 March 1964, I. Bathgate, at light] [MJF collection, MJF003192] (ASCU) coordinates of East Ballina: 28 ° 52 'S 153 ° 35 'E. Diagnosis. The species is immediately recognized by the following combination of characters: (1) frons pale yellow-brown with 2 small black spots at base of disc (Fig. 1 B), (2) hind wings without red or orange (Fig. 1 A), (3) abdominal tergites 5 to 8 red (Fig. 1 A), (4) size less than 24 mm. Description. LT (extrapolated): Ƥ (n = 1): 21 mm. Head: pale yellow-brown, with 2 baso-lateral points on disc of frons and frons-vertex joint black (Figs. 1 A–B); median and lateral oblique carinae on disc of frons well marked (Fig. 1 B); pedicel large, inflated and reniform (Fig. 1 B); labium reaching median trochanters; ratio BV/LV = 4.9; BF/LF = 1.5. Thorax: pale yellow-brown, including tegulae; row of 4 black dots on pronotum, behind head; mesonotum with black dots: row of 7 along posterior margin of pronotum, row of 4 on disc and one on scutellum; 2 small black spots on lateral thoracic pleura; mesonotum black (Fig. 1 A); ratio LP+LM/BT = 0.9; LM/LP = 2.2. Tegmina: apical half hyaline with veins pale yellow-green; basal half pale yellow-green with veins brown; costal cell pale orange-brown; all densely covered with rounded, black spots, often confluent, larger ones with central pale spot covered with white waxy secretion (fig. 1 A); ratio LTg/BTg = 3.25. Hind wings: apical half hyaline; basal half black with large, ante-basal, milky white patch; white patch marked with black between veins R and M and along claval joint; veins black, vein Sc white basally (Fig. 1 A). Legs: all legs pale yellow-brown with apex of tarsi and of spines of hind legs black; hind tibiae with 4 lateral and 7 apical spines (Fig. 1 A). Abdomen: dorsally, black with sides of tergite 4 and tergites 5 to 8 red (Fig. 1 A); pale yellow-brown ventrally. Biology. The only known specimen has been caught at light trap. Distribution (Fig. 5). NE New South Wales.Published as part of Constant, Jerome, 2010, Review of the Australian genus Desudaboides Musgrave with descriptions of four new species (Hemiptera: Fulgoromorpha: Fulgoridae), pp. 39-48 in Zootaxa 2351 on page 43, DOI: 10.5281/zenodo.19346
An Auto-Zero Stabilized Voltage Buffer with a Quiet Chopping Scheme and Constant Input Current
No full text The readout of high-impedance sensors and sampled voltage references [1] requires amplifiers that can achieve both low offset and low input current. Recently, it has been shown that this unique combination can be achieved by an auto-zero (AZ) stabilized buffer [2]. However, its low-frequency noise density is surd 5 times higher than the buffer's own white-noise voltage spectral density e n . Furthermore, its input current is not constant, but varies significantly with the input voltage. To overcome the first issue, a chopped AZ stabilization loop with an optimized duty-cycle is proposed to bring the low-frequency noise density close to surd 2cdot {e}-{n}, the fundamental limit of an AZ stabilized amplifier. The second issue is solved by replacing the transmission-gate input switches used in [2] with NMOS switches and a constant Vgs drive. This keeps their charge injection constant over a wide input voltage range, and results in a constant input current. Session 18.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
Solution to the cocktail party problem: A time-reversal active metasurface for multipoint focusing
No full textInternational audienceThe cocktail party effect is the capability to focus one’s auditory attention on particular audio sources while ignoring other audio sources. We propose an experimental strategy to reproduce this ability by designing a time-dependent metasurface composed of independent active mirrors. Each active mirror is a programmable acoustic unit cell capable of hearing, computing, and re-emitting acoustic signals: each of them acts as a convolution filter. The proper configuration of the metasurface temporal filters allows one to establish an acoustic communication link between groups of individuals immersed in the noisy environment: a multiple-user multiple-input, multiple-output acoustic system is built
FilipeChagasDev/register-by-constant-qft-adder:
No full textIntroduction
This is a quantum algorithm I created that can be considered a simplified version of Draper's adder. This algorithm is described as a unitary operator such that , where is the initial state of the -qubit register. This state can be defined for natural number as:
This state can also be defined for (signed) integer numbers using the two's complement notation.
The operator is defined as , where .
Organization
This repository is organized as follows:
The file qiskit_quantum_fourier_transform.py contains a function that gives the QFT gate. As the filename says, this function uses Qiskit.
The file qiskit_reg_by_const_qft_adder.py has functions that gives Qiskit gates of the operators and .
The file qiskit_reg_by_const_qft_adder_test.ipynb is a Jupyter notebook made for test the functions in qiskit_reg_by_const_qft_adder.py. This notebook contains the results of some tests.
The file numeric_systems.py has functions that convert natural numbers and integers into sequences of bits. These functions are used for testing.
The file test_tools.py contains functions that are used for testing.
Paper
This algorithm is described in detail in the paper "Quantum Algorithm based on Quantum Fourier Transform for Register-by-Constant Addition" (https://doi.org/10.48550/arXiv.2207.05309). If you use this algorithm in your research, please cite it as follows:
@misc{ferraz_22,
doi = {10.48550/ARXIV.2207.05309},
url = {https://arxiv.org/abs/2207.05309},
author = {Ferraz, Filipe Chagas},
keywords = {Quantum Physics (quant-ph), FOS: Physical sciences, FOS: Physical sciences},
title = {Quantum Algorithm based on Quantum Fourier Transform for Register-by-Constant Addition},
publisher = {arXiv},
year = {2022},
copyright = {Creative Commons Attribution 4.0 International}
A time reversal metasurface for mimicking the cocktail party effect
No full textInternational audienceThe cocktail party effect is the capability to focus one's auditory attention on particular audio sources while ignoring other audio sources. We propose an experimental setup reproducing the cocktail party effect by designing a time dependent metasurface composed of independent active mirrors. Each active mirror is a programmable acoustical unit cell capable of hearing, computing and emitting acoustic signals: each of them acts as a convolution filter. The proper metasurface temporal filters configuration allows us to establish acoustic communication between groups of individuals immersed in a noisy environment: we have designed a multi-user, multi-input and multi-output (MU-MIMO) acoustic system. \ The experiment based on underwater ultrasonics consists in prerecording a set of Green's function between emitters and active mirrors, and a second set Green's functions between the active mirrors and receivers. In order to increase the spatio-temporal degrees of freedom (Lemoult \textit{et al.}, PRL \textbf{103} 2009), we place a forest of steel rods in between the active mirrors and both the emitters and the receivers. These data are then used to compute each active mirror's temporal filter using time reversal properties to establish a proper predefined MU-MIMO configuration. The emitters now emits simultaneously uncorrelated noises, hence reproducing the cocktail party situation. These signals propagate through the disordered medium to the metasurface, then each active mirror of the metasurface hears, convolutes with his temporal filter and emits another signal which propagates back through the disordered medium towards the receivers. In the end we establish a correlation matrix by comparing emitted and received signals and we demonstrate how the time reversal based metasurface allows to focus signals coming from specific emitters towards their dedicated receivers
Dielectric constant of water in the interface
No full textabstract: We define the dielectric constant (susceptibility) that should enter the Maxwell boundary value problem when applied to microscopic dielectric interfaces polarized by external fields. The dielectric constant (susceptibility) of the interface is defined by exact linear-response equations involving correlations of statistically fluctuating interface polarization and the Coulomb interaction energy of external charges with the dielectric. The theory is applied to the interface between water and spherical solutes of altering size studied by molecular dynamics (MD) simulations. The effective dielectric constant of interfacial water is found to be significantly lower than its bulk value, and it also depends on the solute size. For TIP3P water used in MD simulations, the interface dielectric constant changes from 9 to 4 when the solute radius is increased from ∼5 to 18 Å.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in The Journal of Chemical Physics and may be found at http://aip.scitation.org/doi/10.1063/1.4955203
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