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Articles de revues sur le sujet « Indicial function »

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Auteur : Grafiati
Publié le 10 mars 2023

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1

Shaw, S. T., et N. Qin. « Calculation of compressible indicial response ». Aeronautical Journal 104, no 1042 (décembre 2000) : 665–73. http://dx.doi.org/10.1017/s0001924000096913.

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Abstract The present paper addresses the problem of extracting indicial response functions from solutions of the Navier-Stokes equations. Two approaches are considered. In the first, the indicial response is computed directly by modifying the local grid velocity to reflect the step change in plunge velocity. The computed data are then fitted using an assumed form for the response function and numerical optimisation techniques. In the second (indirect) approach, the general form of the lift transfer operator is determined analytically from the functional form of the assumed response. Using the lift transfer operator explicit solutions of the in-phase and quadrature components of the normal force time history can be obtained. The unknown coefficients in the response function are then extracted from computed data for harmonic motion by fitting the time history using the explicit solution. Computed response functions are presented for a range of Mach numbers and are compared with analytical results and indicial models currently used within the rotorcraft community. For the cases considered there is no significant difference between the response functions determined using the direct or indirect approach. Comparison of the computed results with existing models suggests that generalisation of the response to step changes in incidence using a two-pole approximation of the circulatory response together with the Prandtl-Glauert factor is not possible. However, comparison with higher order semi-empirical models is much improved, providing some justification for the use of such models. In addition to these observations, the extracted response functions suggest improvements to piston theory to account for thickness effects. The proposed modification of piston theory is based upon properties of the static pressure distribution and so can be used in conjunction with both CFD and experimental data.
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Prodanov, Dimiter. « Generalized Differentiability of Continuous Functions ». Fractal and Fractional 4, no 4 (10 décembre 2020) : 56. http://dx.doi.org/10.3390/fractalfract4040056.

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Many physical phenomena give rise to mathematical models in terms of fractal, non-differentiable functions. The paper introduces a broad generalization of the derivative in terms of the maximal modulus of continuity of the primitive function. These derivatives are called indicial derivatives. As an application, the indicial derivatives are used to characterize the nowhere monotonous functions. Furthermore, the non-differentiability set of such derivatives is proven to be of measure zero. As a second application, the indicial derivative is used in the proof of the Lebesgue differentiation theorem. Finally, the connection with the fractional velocities is demonstrated.
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3

Marzocca, P., L. Librescu et G. Chiocchia. « Aeroelasticity of two-dimensional lifting surfaces via indicial function approach ». Aeronautical Journal 106, no 1057 (mars 2002) : 147–53. http://dx.doi.org/10.1017/s0001924000012884.

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An aeroelastic formulation of 2D lifting surfaces in an incompressible flow field via the use of aerodynamic indicial functions is presented. The approach carried out in time and frequency domains yields the proper aerodynamic loads necessary to the study of the subcritical aeroelastic response and flutter of lifting surfaces, respectively. The expressions of the unsteady lift and aerodynamic twist moment in the frequency domain are given in terms of the Theodorsen’s function, while in the time domain, these are obtained directly with the help of the Wagner’s function. Closed form expressions of unsteady aerodynamic derivatives, helpful in an unified approach of response and flutter analyses, and results related to aeroelastic response to gust and blast loads are supplied. In this context, a novel representation of the aeroelastic response in the phase - space was supplied and pertinent conclusions on the implications of some basic parameters have been outlined.
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4

Borri, C., et C. Costa. « A parametric study of indicial function models in bridge deck aeroelasticity ». Wind and Structures 7, no 6 (25 décembre 2004) : 405–20. http://dx.doi.org/10.12989/was.2004.7.6.405.

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5

Sibilski, Krzysztof, Mirosław Nowakowski, Dariusz Rykaczewski, Paweł Szczepaniak, Andrzej Żyluk, Anna Sibilska-Mroziewicz, Michał Garbowski et Wiesław Wróblewski. « Identification of Fixed-Wing Micro Aerial Vehicle Aerodynamic Derivatives from Dynamic Water Tunnel Tests ». Aerospace 7, no 8 (13 août 2020) : 116. http://dx.doi.org/10.3390/aerospace7080116.

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A micro air vehicle (MAV) is a class of miniature unmanned aerial vehicles that has a size restriction and may be autonomous. Fixed-wing MAVs are very attractive for outdoor surveillance missions since they generally offer better payload and endurance capabilities than rotorcraft or flapping-wing vehicles of equal size. This research paper describes the methodology applying indicial function theory and artificial neural networks for identification of aerodynamic derivatives for fixed-wing MAV. The formulation herein proposed extends well- known aerodynamic theories, which are limited to thin aerofoils in incompressible flow, to strake wing planforms. Using results from dynamic water tunnel tests and indicial functions approach allowed to identify MAV aerodynamic derivatives. The experiments were conducted in a water tunnel in the course of dynamic tests of periodic oscillatory motion. The tests program range was set at high angles of attack and a wide scope of reduced frequencies of angular movements. Due to a built-in propeller, the model’s structure test program was repeated for a turned-on propelled drive system. As a result of these studies, unsteady aerodynamics characteristics and aerodynamic derivatives of the micro-aircraft were identified as functions of state parameters. At the Warsaw University of Technology and the Air Force Institute of Technology, a “Bee” fixed wings micro aerial vehicle with an innovative strake-wing outline and a propeller placed in the wing gap was worked. This article is devoted to the problems of identification of aerodynamic derivatives of this micro-aircraft. The result of this research was the identification of the aerodynamic derivatives of the fixed wing MAV “Bee” as non-linear functions of the angle of attack, and reduced frequency. The identification was carried out using the indicial function approach.
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6

Zhang, Dongming, Hiromichi Shirato et Kohei Wada. « Experimental extraction of indicial lift response function by an iterative correction method ». Journal of Wind Engineering and Industrial Aerodynamics 168 (septembre 2017) : 141–51. http://dx.doi.org/10.1016/j.jweia.2017.05.009.

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7

Liu, S. Q., et Y. C. Fung. « Indicial functions of arterial remodeling in response to locally altered blood pressure ». American Journal of Physiology-Heart and Circulatory Physiology 270, no 4 (1 avril 1996) : H1323—H1333. http://dx.doi.org/10.1152/ajpheart.1996.270.4.h1323.

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We investigated the effect of locally altered blood pressure on the remodeling processes of the cells and extracellular matrices of the splenic and ileal arteries and used an indicial function approach to quantitatively analyze the relationship between the altered blood pressure and the remodeling processes. Blood pressure in these arteries was locally modulated by constricting the aorta at a location between the celiac and mesenteric bifurcations, resulting in a higher blood pressure at the splenic arteries then at the ileal arteries, After the pressure changes, the cross-sectional areas and the fractions of the cells and extracellular matrices of the splenic and ileal arteries were examined by electron microscopy at 2, 6, 10, 20, and 30 days. We found that both arteries remodeled, but the splenic arteries (higher blood pressure) remodeled more rapidly and to a larger degree than the ileal arteries (lower pressure compared with the splenic arteries) of the same animal. To verify whether an identical change in the blood pressure at the splenic and ileal arteries leads to the same remodeling process in these arteries, we created another model by constricting the aorta at a location between the mesenteric and renal bifurcations, resulting in hypertension of the same level at both splenic and ileal arteries. We found that the remodeling processes of the cells and matrices were almost identical in the arteries with similar changes in blood pressure. Thus we conclude that the remodeling processes of cells and matrices of the splenic and ileal arteries are dependent on the local blood pressure in aorta constriction-induced hypertension, and the indicial analysis is a useful approach in the description of the relationship between the blood pressure and the arterial remodeling processes.
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8

Marzocca, P., L. Librescu, D.-H. Kim, I. Lee et S. Schober. « Development of an indicial function approach for the two-dimensional incompressible/compressible aerodynamic load modelling ». Proceedings of the Institution of Mechanical Engineers, Part G : Journal of Aerospace Engineering 221, no 3 (mars 2007) : 453–63. http://dx.doi.org/10.1243/09544100jaero88.

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9

Chobsilprakob, Panot, Ki-Du Kim, Songsak Suthasupradit et Anaphat Manovachirasan. « Application of indicial function for the flutter analysis of long span suspension bridge during erection ». International Journal of Steel Structures 14, no 1 (mars 2014) : 185–94. http://dx.doi.org/10.1007/s13296-014-1016-2.

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10

Lu, X., J. B. Zhao, G. R. Wang, H. Gregersen et G. S. Kassab. « Remodeling of the zero-stress state of femoral arteries in response to flow overload ». American Journal of Physiology-Heart and Circulatory Physiology 280, no 4 (1 avril 2001) : H1547—H1559. http://dx.doi.org/10.1152/ajpheart.2001.280.4.h1547.

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The goal of this study is to quantitatively describe the remodeling of the zero-stress state of the femoral artery in flow overload. Increased blood flow, approximately as a unit step change, was imposed on the femoral artery by making an arteriovenous (a-v) fistula with the epigastric vein. The a-v fistula was created in the right leg of 36 rats, which were divided equally into six groups (2 days and 1, 2, 4, 8, and 12 wk after the fistula). The vessels in the left leg were used as controls without operative trauma. The in vivo blood pressure, flow, and femoral outer diameter and the in vitro zero-stress state geometry were measured. The in vivo shear rate at the endothelial surface increased approximately as a step function by ∼83%, after 2 days, compared with the control artery. The arterial luminal and wall area significantly increased postsurgically from 0.15 ± 0.02 and 0.22 ± 0.02 mm2 to 0.28 ± 0.04 and 0.31 ± 0.05 mm2, respectively, after 12 wk. The wall thickness did not change significantly over time ( P > 0.1). The opening angle decreased to 82 ± 4.2 degrees postsurgically when compared with controls (102 ± 4.4) after 12 wk and correlated linearly with the thickness-to-radius ratio. Histological analysis revealed vascular smooth muscle cell growth. The remodeling data are expressed mathematically in terms of indicial functions, i.e., change of a particular feature of a blood vessel in response to a unit step change of blood flow. The indicial function approach provides a quantitative description of the remodeling process in the blood vessel wall.
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11

REHMAN, Zia Ur. « Time-domain Analytical Method for Aeroelastic Analysis of High Aspect Ratio Wing Using Unsteady Indicial Aerodynamics ». INCAS BULLETIN 14, no 3 (9 septembre 2022) : 85–99. http://dx.doi.org/10.13111/2066-8201.2022.14.3.8.

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This paper deals with the development of a novel time-domain analytical method to perform an aeroelastic stability analysis of a high aspect ratio wing. The aerodynamic model in this paper is built upon the frequency domain of Theodorsen aerodynamics. An inverse Fourier transform technique is applied to convert the Theodorsen frequency domain transfer function to the Wagner time-domain response function. Later, lift and moment expressions, containing aerodynamic lag states are obtained using the indicial function approach which performs the convolution of the unit step response Wagner lift function with arbitrary input and its time derivative using the principle of superposition. Additional equations containing the derivative of aerodynamic lag states are coupled with previously obtained lift and moment expressions to fully get the complete unsteady aerodynamic model in the time-domain. This time-domain unsteady aerodynamic model is then coupled with a combined bending torsion beam finite element model, using the state space approach. A complex eigenvalue analysis of this state space system is performed, using MATLAB, to determine both the static and dynamic aeroelastic stability boundary. Finally, in this paper, aeroelastic stability analysis of the high aspect ratio wing is performed using the current method and results are validated with MSC Nastran aeroelastic analysis and those available in the literature.
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12

Bergami, Leonardo, Mac Gaunaa et Joachim Heinz. « Indicial lift response function : an empirical relation for finite-thickness airfoils, and effects on aeroelastic simulations ». Wind Energy 16, no 5 (27 juin 2012) : 681–93. http://dx.doi.org/10.1002/we.1516.

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13

Stickle, Miguel Martín, Miguel Molinos, Pedro Navas, Ángel Yagüe, Diego Manzanal, Saeid Moussavi et Manuel Pastor. « A component-free Lagrangian finite element formulation for large strain elastodynamics ». Computational Mechanics 69, no 3 (9 novembre 2021) : 639–60. http://dx.doi.org/10.1007/s00466-021-02107-0.

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AbstractStandard finite element formulation and implementation in solid dynamics at large strains usually relies upon and indicial-tensor Voigt notation to factorized the weighting functions and take advantage of the symmetric structure of the algebraic objects involved. In the present work, a novel component-free approach, where no reference to a basis, axes or components is made, implied or required, is adopted for the finite element formulation. Under this approach, the factorisation of the weighting function and also of the increment of the displacement field, can be performed by means of component-free operations avoiding both the use of any index notation and the subsequent reorganisation in matrix Voigt form. This new approach leads to a straightforward implementation of the formulation where only vectors and second order tensors in $${\mathbb {R}}^3$$ R 3 are required. The proposed formulation is as accurate as the standard Voigt based finite element method however is more efficient, concise, transparent and easy to implement.
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14

Melas, Evangelos, Costas Poulios, Elias Camouzis, John Leventides et Nick Poulios. « Study of the Hypergeometric Equation via Data Driven Koopman-EDMD Theory ». Axioms 12, no 2 (29 janvier 2023) : 134. http://dx.doi.org/10.3390/axioms12020134.

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We consider a data-driven method, which combines Koopman operator theory with Extended Dynamic Mode Decomposition. We apply this method to the hypergeometric equation which is the Fuchsian equation with three regular singular points. The space of solutions at any of its singular points is a two-dimensional linear vector space on the field of reals when the independent variable is restricted to take values in the real axis and the unknown function is restricted to be a real-valued function of a real variable. A basis of the linear vector space of solutions is spanned by the hypergeometric function and its products with appropriate powers of the independent variable or the logarithmic function depending on the roots of the indicial equation of the hypergeometric equation. With our work, we obtain a new representation of the fundamental solutions of the hypergeometric equation and relate them to the spectral analysis of the finite approximation of the Koopman operator associated with the hypergeometric equation. We expect that the usefulness of our results will come more to the fore when we extend our study into the complex domain.
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15

Filippone, Antonio. « Unsteady Gust Response of Road Vehicles ». Journal of Fluids Engineering 125, no 5 (1 septembre 2003) : 806–12. http://dx.doi.org/10.1115/1.1603304.

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A theoretical model based on an indicial method is proposed to simulate the unsteady response of a series of road vehicles, including high-speed trains, sports utility vehicles, sports cars, caravans, and pick-up trucks. The response is described in the frequency domain by the aerodynamic admittance for both side force and yawing moment. The properties of the admittance function are discussed for basic two-dimensional geometries, and the existence of critical damping is shown for a number of cases. The vehicles are undergoing aerodynamic forcing in the form of a gust. Systems with one degree-of-freedom were considered. The results show that the main parameters affecting the vehicle’s aerodynamic response are the mean vehicle length compared to the wave length of the gust, and the inclination of the nose.
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16

SI, HAI-QING, et TONG-GUANG WANG. « CALCULATION OF THE UNSTEADY AIRLOADS ON WIND TURBINE BLADES UNDER YAWED FLOW ». Modern Physics Letters B 23, no 03 (30 janvier 2009) : 493–96. http://dx.doi.org/10.1142/s0217984909018734.

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A dynamic stall model is coupled with the blade element momentum theory to calculate the cyclic variation of the aerodynamic characteristics of the wind turbine in yawed flow. In the dynamic stall model, unsteady effects under attached flow conditions are simulated by the superposition of indicial aerodynamic responses. The movement of the unsteady flow separation point is related to the static separation based on the Kirchhoff flow model via a deficiency function, in which the unsteady boundary layer response and the leading edge pressure response are taken into consideration. The induced vortex force and the associated pitching moment are represented empirically in a time-dependent manner during dynamic stall. The required input of the inflow velocity and incidence to the dynamic stall model is calculated using the improved blade element momentum theory. The calculated results are compared well with the NREL UAE Phase VI experimental data. For completeness, possible factors causing the difference between calculated and experimental results are analyzed and discussed in detail in this paper.
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Castelli-Olvera, Sarahi Isuki. « New Age elements in the Clamp’s manga X ». Jangwa Pana 17, no 1 (29 décembre 2017) : 23. http://dx.doi.org/10.21676/16574923.2295.

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In this article, we start from the consideration that manga X, created by the collective CLAMP between 1994 and2003, and published in Mexico by Editorial Vid between 2002 and 2005, is a story whose overarching principle corresponds to the various elements of the New Age. We base this on the following assumptions: first in this manga, the sephirotic tree, the B.O.T.A. tarot and the aspects of Enochian magic, typical of western esoterism, are present iconographically. Second, Kamui, the subject of the story, represents God, so that his actions determine the entire narrative; besides, it has a twin star (Fuma), which fulfills the function of being its complementary opposite. Finally, the apocalypse is detonated by the well-being of the Earth, which arises as an organism with its own life and is intended to survive the destruction of humanity. We carry out this analysis taking up the notion of an overarching principle, as well as the importance of the source, present in the historical method. In addition to the above, we use the paradigm of indicial inferences proposed by Carlo Ginzburg, the elements of structural analysis of Helena Beristain’s story and the notion of postmodernity introduced by Fredrick Jameson. The primary sources would be the 18 volumes of X published in Mexico.
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18

Kumar, R., et A. K. Ghosh. « Parameter estimation using unsteady downwash model from real flight data of Hansa-3 aircraft ». Aeronautical Journal 115, no 1171 (septembre 2011) : 577–88. http://dx.doi.org/10.1017/s0001924000006217.

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Abstract The paper presents the estimation of longitudinal aerodynamic parameters from simulated as well as real flight data using an unsteady downwash model. The task of parameter estimation was accomplished using the Maximum Likelihood (ML) method in the frequency domain for the Hansa-3 aircraft. The presented work pertains to the aircraft having a semi-sweptback wing configuration, however, the work reported earlier considered a rectangular wing configuration. A simple vortex system was used to model downwash effects in the longitudinal equations of motion. First, it was established that the indicial lift function had a minor or negligible influence on aircraft motion and on the estimated aerodynamic parameters using simulated data for the configuration of Hansa-3 aircraft. Next, two parameter extraction algorithms were used for parameter estimation using simulated data (with unsteadiness only in downwash) and real flight data (Hansa-3 aircraft). The first algorithm included unsteadiness only in downwash while the second neglected all the unsteady effects. It was observed from the results obtained that if unsteady effects were omitted from the parameter estimation algorithm, the extracted parameters included the effects of unsteady aerodynamics. Therefore, application of the extraction algorithm in the two modes provides a convenient means of separating steady-state and acceleration derivatives.
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19

Jaworski, Justin W., et Earl H. Dowell. « Supersonic Indicial Lift Functions from Transform Methods ». AIAA Journal 45, no 8 (août 2007) : 2106–11. http://dx.doi.org/10.2514/1.28144.

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Iosilevskii, Gil. « Indicial response functions in weak ground effect ». European Journal of Mechanics - B/Fluids 33 (mai 2012) : 40–57. http://dx.doi.org/10.1016/j.euromechflu.2011.12.001.

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21

Li, Ang, Georg Raimund Pirrung, Mac Gaunaa, Helge Aagaard Madsen et Sergio González Horcas. « A computationally efficient engineering aerodynamic model for swept wind turbine blades ». Wind Energy Science 7, no 1 (21 janvier 2022) : 129–60. http://dx.doi.org/10.5194/wes-7-129-2022.

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Abstract. In this work, a computationally efficient engineering model for the aerodynamics of swept wind turbine blades is proposed for the extended blade element momentum (BEM) formulation. The model is modified based on a coupled near- and far-wake model, in which the near wake is assumed to be the first quarter revolution of the non-expanding helical wake of the own blade. For the special case of in-plane trailed vorticity, the original empirical equations determining the steady-state value of the near-wake induction are replaced by the analytical results, which are in the form of incomplete elliptic integrals. For the general condition of helical trailed vorticities, the steady-state near-wake induction is approximated based on the results of the special conditions and a correction factor. The factor is calculated using empirical equations with influence coefficient tensors, to minimize the computational effort. These influence coefficient tensors are pre-calculated and are fitted to the results from the numerical integration of the Biot–Savart law. With the indicial function approach, it is not necessary to explicitly save the information of the vorticities that were trailed in the previous time steps. This engineering approach is a combination of analytical results and numerical approximations, with low and constant computational effort for each time step. The proposed model is practically applicable to time-marching aero-servo-elastic simulations. The results of the swept blades with uniform inflow perpendicular to the rotor calculated from the proposed model are compared with the results from a BEM code, a lifting-line solver and a Navier–Stokes solver. The significantly improved agreement with the higher-fidelity models compared to the BEM method highlights the performance of the proposed method.
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Costa, Carlotta, et Claudio Borri. « Application of indicial functions in bridge deck aeroelasticity ». Journal of Wind Engineering and Industrial Aerodynamics 94, no 11 (novembre 2006) : 859–81. http://dx.doi.org/10.1016/j.jweia.2006.06.007.

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23

Farsani, Hooman Yadollahi, Daniel T. Valentine, Andrea Arena, Walter Lacarbonara et Pier Marzocca. « Indicial functions in the aeroelasticity of bridge decks ». Journal of Fluids and Structures 48 (juillet 2014) : 203–15. http://dx.doi.org/10.1016/j.jfluidstructs.2014.02.015.

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Brar, P. S., R. Raul et R. H. Scanlan. « NUMERICAL CALCULATION OF FLUTTER DERIVATIVES VIA INDICIAL FUNCTIONS ». Journal of Fluids and Structures 10, no 4 (mai 1996) : 337–51. http://dx.doi.org/10.1006/jfls.1996.0022.

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Costa, C. « Aerodynamic admittance functions and buffeting forces for bridges via indicial functions ». Journal of Fluids and Structures 23, no 3 (avril 2007) : 413–28. http://dx.doi.org/10.1016/j.jfluidstructs.2006.10.002.

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Zhang, Zhitian. « Multistage Indicial Functions and Postflutter Simulation of Long-Span Bridges ». Journal of Bridge Engineering 23, no 4 (avril 2018) : 04018010. http://dx.doi.org/10.1061/(asce)be.1943-5592.0001218.

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Leishman, J. G. « Validation of approximate indicial aerodynamic functions for two-dimensional subsonic flow ». Journal of Aircraft 25, no 10 (octobre 1988) : 914–22. http://dx.doi.org/10.2514/3.45680.

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Zhang, Zhitian, Zhengqing Chen, Yiyong Cai et Yaojun Ge. « Indicial Functions for Bridge Aeroelastic Forces and Time-Domain Flutter Analysis ». Journal of Bridge Engineering 16, no 4 (juillet 2011) : 546–57. http://dx.doi.org/10.1061/(asce)be.1943-5592.0000176.

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Abramov, S. A., et A. A. Ryabenko. « Indicial rational functions of linear ordinary differential equations with polynomial coefficients ». Journal of Mathematical Sciences 163, no 5 (12 novembre 2009) : 455–68. http://dx.doi.org/10.1007/s10958-009-9700-z.

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Dang, Quang, Hans Gregersen, Birgitte Duch et Ghassan S. Kassab. « Indicial response functions of growth and remodeling of common bile duct postobstruction ». American Journal of Physiology-Gastrointestinal and Liver Physiology 286, no 3 (mars 2004) : G420—G427. http://dx.doi.org/10.1152/ajpgi.00306.2003.

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Biliary duct obstruction is an important clinical condition that stems from cholelithiasis, the neoplasm in the wall or, most commonly, gallbladder stones. The objective of this study is to understand the structural and mechanical remodeling of the common bile duct (CBD) postobstruction. Porcine CBD was ligated near the duodenum that increased the duct's pressure from 6.4 to 18.3 cmH2O in the first 12 h and to 30.7 cmH2O after 32 days. The remodeling process was studied after 3 h, 12 h, 2 days, 8 days, and 32 days ( n = 5 in each group) after obstruction. One additional animal in each group was sham operated. At each scheduled time, the time course of change of morphometry (diameter, length, wall thickness, etc.) and mechanical properties (stress, strain, etc.) was documented. It was found that the diameter increased by about threefold and the wall thickness of the CBD doubled in the 32-day group compared with the sham group ( P < 0.001). The stress and strain increased initially with increase in pressure but recovered to near the control values by day 32 due to the structural and mechanical adaptations. Hence, the net effect of the structural and mechanical remodeling is to restore the stress and strain to their homeostatic values. Furthermore, the strain recovers more rapidly and more completely than stress. Finally, the remodeling data were expressed mathematically in terms of indicial response functions (IRF), i.e., change of a particular feature of a CBD in response to a unit step change of the pressure. The IRF approach provides a quantitative description of the remodeling process in the CBD.
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Sternberg, A. « Stability investigation of long-span bridges using indicial functions with oscillatory terms ». Probabilistic Engineering Mechanics 6, no 3-4 (septembre 1991) : 164–74. http://dx.doi.org/10.1016/0266-8920(91)90007-q.

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Parashchuk, Y. S., T. V. Gorbach, E. V. Gancheva et S. N. Martynova. « INDICIES OF ENDOTHELIAL FUNCTION IN WOMEN WITH PYELONEPHRITIS ». Neonatology, surgery and perinatal medicine 5, no 1(15) (29 mars 2015) : 64–67. http://dx.doi.org/10.24061/2413-4260.v.1.15.2015.13.

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Chobsilprakob, Panot, Songsak Suthasupradit et Ki-Du Kim. « Aeroelastic analysis of long span bridges via indicial functions considering geometric and material nonlinearity ». International Journal of Steel Structures 11, no 2 (juin 2011) : 215–26. http://dx.doi.org/10.1007/s13296-011-2009-z.

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Mikkelsen, O., et J. B. Jakobsen. « Aeroelastic Response from Indicial Functions with a Finite Element Model of a Suspension Bridge ». IOP Conference Series : Materials Science and Engineering 276 (décembre 2017) : 012006. http://dx.doi.org/10.1088/1757-899x/276/1/012006.

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de Miranda, S., L. Patruno, F. Ubertini et G. Vairo. « Indicial functions and flutter derivatives : A generalized approach to the motion-related wind loads ». Journal of Fluids and Structures 42 (octobre 2013) : 466–87. http://dx.doi.org/10.1016/j.jfluidstructs.2013.08.009.

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Manglano-Villamarin, C. E., et S. T. Shaw. « Three-dimensional indicial response of finite aspect ratio yawed wings ». Aeronautical Journal 111, no 1120 (juin 2007) : 359–71. http://dx.doi.org/10.1017/s0001924000004619.

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Abstract The influence of finite aspect ratio and yaw on the computed indicial response of a pitching wing has been studied using numerical solutions of the unsteady Euler equations. The indicial response was obtained directly from computations of the unsteady flow around two- and three-dimensional wings subjected to a step change in incidence at Mach numbers between 0·2 and 0·7. The data reveal several important characteristics in the behaviour of the unsteady response of three-dimensional wings. The initial response is shown to be independent of both aspect ratio and yaw confirming the results of linearized theory. During the subsequent development of the unsteady response significant differences are observed between the two- and three-dimensional behaviours as a consequence of changes to both wing aspect ratio and yaw angle. The formation and spanwise propagation of acoustic waves due to finite aspect ratio is shown to have a significant influence on the development of the unsteady forces, while for yawed wings the results indicate that the manner in which the windward and leeward tip vortices form is important. Based upon these observations it is suggested that the current practice within the rotorcraft community in which two-dimensional indicial response functions are employed may be unreliable for the advancing blade.
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Zagaykan, Yulia, Oleksandr Spryn et Nikolay Zagaykan. « RESEARCH OF SENSOMOTOR REACTION, MEMORY AND ATTENTION INDICIES UNDER SENSORY DEPRIVATION ». EUREKA : Life Sciences 5 (17 septembre 2019) : 3–12. http://dx.doi.org/10.21303/2504-5695.2019.00977.

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The article considers the influence of sensory (visual and auditory) deprivation on a sensorimotor response, memory, and attention among 8-11 years old children. The literature review concludes that sensory deprivation causes discomfort and problems in perceiving of reality. Also, under the influence of various factors that damage body structures, compensatory reactions are launched to compensate for impaired functions. The processes that provide the body with the restoration of lost structures and impaired functions of the pathology are called «compensatory-adaptive processes». Having conducted statistical analysis of the obtained data of latent periods of different sensomotor responses among children with sensory deprivation and the control group, it is seen, that the level of stimuli in the form of figures was higher among children with hearing impairments, and in the form of sounds – in the group of children with visual impairments. According to the results of our study, we can assume that in groups of children with sensory deprivation the process of compensating the impaired function of a particular analyzer takes place at the expense of another one.
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Ali, Khawaja, Hiroshi Katsuchi et Hitoshi Yamada. « Generalized framework for identification of indicial response functions from flutter derivatives of long-span bridges ». Engineering Structures 244 (octobre 2021) : 112727. http://dx.doi.org/10.1016/j.engstruct.2021.112727.

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Caracoglia, L., et N. P. Jones. « A methodology for the experimental extraction of indicial functions for streamlined and bluff deck sections ». Journal of Wind Engineering and Industrial Aerodynamics 91, no 5 (avril 2003) : 609–36. http://dx.doi.org/10.1016/s0167-6105(02)00473-7.

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van Rooij, Michel P. C., Neal T. Frink, Brett R. Hiller, Mehdi Ghoreyshi et Mark Voskuijl. « Generation of a reduced-order model of an Unmanned Combat Air Vehicle using indicial response functions ». Aerospace Science and Technology 95 (décembre 2019) : 105510. http://dx.doi.org/10.1016/j.ast.2019.105510.

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Rodriguez Amado, Jesús Rafael, Ariadna Lafourcade Prada, Julio Cesar Escalona Arranz, Renato Pérez Rosés, Humberto Morris Quevedo, Hady Keita, Edgar Puente Zapata, Caio Pinho Fernandes et José Carlos Tavares Carvalho. « Antioxidant and Hepatoprotective Activity of a New Tablets Formulation fromTamarindus indicaL. » Evidence-Based Complementary and Alternative Medicine 2016 (2016) : 1–7. http://dx.doi.org/10.1155/2016/3918219.

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Hepatotoxic chemicals damage liver cells primarily by producing reactive oxygen species. The decoction of the leaves ofTamarindus indicaL. is used for liver disorders. In this work we evaluated the hepatoprotective activity of a tablet formulation of this plant. Thirty-five Sprague Dawley rats were randomly divided into five groups (n=7). First group (I) is control group, fed with standard diet. Groups II to V (hepatotoxic groups) were subjected to a subcutaneous injection of CCl4(0.5 mL/kg). Group II was negative control, fed with standard diet; group III was subjected to administration of Silymarin 150 mg/kg and groups IV and V were treated with tablets in dose of 100 mg/kg and 200 mg/kg, respectively. Lipid peroxidation and the activity of superoxide dismutase, catalase, and reduced glutathione were evaluated. Serum levels of alanine aminotransferase, aspartate aminotransferase, gamma-glutamine transferase, alkaline phosphatase, and a lipid profile were evaluated too. The tablets inhibit lipid peroxidation. The redox balance (SOD-CAT-GSH) remains normal in the experimental groups treated with tablets. The liver function using dose of 200 mg/kg of tablets was better than the other experimental groups. These results justify, scientifically, the ethnobotanical use of the leaves ofTamarindus indicaL.
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Sánchez-Viesca Francisco et Gómez Reina. « The chemistry of Heller’s test for urine Indican detection ». Magna Scientia Advanced Research and Reviews 5, no 1 (30 mai 2022) : 025–29. http://dx.doi.org/10.30574/msarr.2022.5.1.0038.

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The Heller’s color test for indican in urine is interesting because besides detecting this important biomarker it reveals the dual function of nitric acid since it can accomplish the synthesis of indigo blue and indigo red, as well as it can degrade them to isatin, depending upon the reaction conditions. Moreover, the Heller’s test inspired other tests for indican detection, using other oxidizing reagents. Actually, indican in urine is detected by a colour chart with different tones of blue indicating the concentration of indican via indigo blue formation. In this paper we provide the series of reactions that occur during the test, there are nitrations followed by redox reactions. The organic intermediates are oxidized and the inorganic reagent is reduced to nitrous acid. However, indigo blue and indigo red can be degraded by nitric acid on .heating. The electron flow is given in each step.
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Alexandre, Pâmela A., Antonio Reverter, Roberta B. Berezin, Laercio R. Porto-Neto, Gabriela Ribeiro, Miguel H. A. Santana, José Bento S. Ferraz et Heidge Fukumasu. « Exploring the Regulatory Potential of Long Non-Coding RNA in Feed Efficiency of Indicine Cattle ». Genes 11, no 9 (25 août 2020) : 997. http://dx.doi.org/10.3390/genes11090997.

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Long non-coding RNA (lncRNA) can regulate several aspects of gene expression, being associated with complex phenotypes in humans and livestock species. In taurine beef cattle, recent evidence points to the involvement of lncRNA in feed efficiency (FE), a proxy for increased productivity and sustainability. Here, we hypothesized specific regulatory roles of lncRNA in FE of indicine cattle. Using RNA-Seq data from the liver, muscle, hypothalamus, pituitary gland and adrenal gland from Nellore bulls with divergent FE, we submitted new transcripts to a series of filters to confidently predict lncRNA. Then, we identified lncRNA that were differentially expressed (DE) and/or key regulators of FE. Finally, we explored lncRNA genomic location and interactions with miRNA and mRNA to infer potential function. We were able to identify 126 relevant lncRNA for FE in Bos indicus, some with high homology to previously identified lncRNA in Bos taurus and some possible specific regulators of FE in indicine cattle. Moreover, lncRNA identified here were linked to previously described mechanisms related to FE in hypothalamus-pituitary-adrenal axis and are expected to help elucidate this complex phenotype. This study contributes to expanding the catalogue of lncRNA, particularly in indicine cattle, and identifies candidates for further studies in animal selection and management.
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Mukherjee, Ayan, Sachinandan De, Arpana Verma, Gulshan Dass et Dibyendu Chakraborty. « Prediction of structure and functions from full length coding sequence ofSRYgene in crossbred and Indicine bulls ». Indian Journal of Animal Research 49, no 2 (2015) : 180. http://dx.doi.org/10.5958/0976-0555.2015.00110.7.

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Filipov, Predrag, Dusan Bozic, Romana Mijovic et Gorana Mitic. « Platelet turnover and function in end-stage renal disease ». Vojnosanitetski pregled 75, no 6 (2018) : 604–10. http://dx.doi.org/10.2298/vsp160720374f.

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Background/Aim. End-stage renal disease (ESRD) is characterized by significant impairment of platelet functions which may cause bleeding or thrombotic complications. The iam of this study was the aim of this study was the assessement of platelet turnover and function and their correlation with inflammatory and procoagulant markers in ESRD patients as well as platelet indicies comparison between ESRD diabetic and ESRD non-diabetic patients. Methods. The prospective, observational clinical study included 63 ESRD patients and 30 age and sex matched healthy volunteers. Following laboratory parameters of platelet turnover and function (platelet count, reticulated platelets, platelet indices, whole blood impedance platelet aggregation), inflammatory and procoagulant markers (number of neutrophils, neutrophil to lymphocyte ratio, C-reactive protein, plasma fibrinogen, D dimer, von Willebrand factor) were obtained. Results. Platelet turnover (% of reticulated platelets) was significantly higher (3.8 ? 2.3 vs. 2.3 ? 1.3; p < 0.01) and platelet aggregation tests induced by thrombin receptor activiting peptide (TRAP) (p < 0.01), adenosine diphospate (ADP) (p < 0.05), arachidonic acid (ASPI) (p < 0.05) and collagen (p < 0.05) were markedly increased in the ESRD patients compared to the control group. The comparison of chronic inflammation and procoagulant markers revealed higher values in all patients comparing to the group of healthy subjects (p < 0.01 regarding all parameters). There was no difference between the ESRD diabetic and ESRD non-diabetic patients. Conclusion. Results point out increased platelet turnover in ESRD as a consequence of platelet activation and consumption induced by clotting system hyperactivity and chronic inflammation. None of the examined parameters do not predict bleeding occurrence.
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Altman, Micah, et Michael McDonald. « Redistricting by Formula : An Ohio Reform Experiment ». American Politics Research 46, no 1 (20 avril 2017) : 103–31. http://dx.doi.org/10.1177/1532673x17700611.

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In the last decade, Ohio reformers advocated redistricting by formula: selecting the redistricting plan that scores best on a predefined objective scoring function that combines prima facie neutral criteria with political goals of plan fairness and district competition. In the post-2010 redistricting, these reformers hosted a public competition where prizes were awarded to the best legal plan scored on the reformers’ formula. The submitted plans provide a unique opportunity to evaluate how redistricting by formula may work in practice. Our analysis finds the public yields a broader range of redistricting plans, on indicia of legal and public policy interest, than developed by the state legislature. The Pareto frontier reveals plans that perform better than the legislature’s adopted plan on one and two dimensions, as well as the reformers’ overall scoring function. Our evaluation reveals minimal trade-offs among the components of the overall competition’s scoring criteria, but we caution that the scoring formula may be sensitive to implementation choices among its components. Compared with the legislature’s plan, the reform community can get more of the four criteria they value; importantly, without sacrificing the state’s only African American opportunity congressional district.
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Sonawane, S. P., G. P. Sharma, N. J. Thakor et R. C. Verma. « Moisture-dependent physical properties of kokum seed (Garcinia indica Choisy) ». Research in Agricultural Engineering 60, No. 2 (30 juin 2014) : 75–82. http://dx.doi.org/10.17221/59/2011-rae.

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Designing the equipment for processing, sorting and sizing of agricultural crops requires information about the crops&rsquo; physical properties. The physical properties of kokum seed were evaluated as a function of moisture content in the range of 7.35 to 25.79% d.b. (dry basis). The average length, width, thickness and one thousand seed mass were 17.17&nbsp;mm, 10.66 mm, 5.87 mm and 410 g, respectively, at a moisture content of 7.35% d.b. The average value of geometric mean diameter and sphericity were 10.19 mm and 59.75%, respectively, at moisture content of 7.35% d.b. As the moisture content increased from 7.35 to 25.79% d.b., the bulk density increased from 345 to 396 kg/m<sup>3</sup>, true density decreased from 1179 to 1070 kg/m<sup>3</sup>, and the corresponding porosity decreased from 65.73 to 55.46%; the repose angle and terminal velocity increased from 32.1 to 42.3&deg; and 4.30 to 6.73 m/s,respectively. The static coefficient of friction increased on three structural surfaces namely, glass (0.59&ndash;0.73), stainless steel (0.81&ndash;0.87) and plywood (0.74&ndash;0.83) in the moisture range from 7.35 to 25.79% d.b. Linear regression equations were used to express the physical properties of kokum seeds as a function of moisture content. &nbsp;
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Sakaki, T. « C302 Effect of working hours on cardiovascular-autonomic nervous functions in engineers in a machinery manufacturing company (II) : Physiological indicies ». SANGYO EISEIGAKU ZASSHI 41, Special (1999) : 574. http://dx.doi.org/10.1539/sangyoeisei.kj00001991328.

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Estellés Frade, Marta. « Indicios de Estandarización Curricular : la Pedagogía del Entorno en los Currículos Oficiales de Educación Primaria de Chile y España ». education policy analysis archives 21 (27 octobre 2013) : 82. http://dx.doi.org/10.14507/epaa.v21n82.2013.

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This study analyzes the treatment of the socio cultural environment in the Chilean and Spanish official curricula in Social Sciences (Primary Education) in search of evidence that The New Institutionalism in Historical Sociology of Education postulated as arising from world institutionalization of education. Differences between both decrees have to do more with specific details or matters of degree than with divergences in essential aspects of the curriculum. The use of discourses and rhetoric of politically correct pedagogy that conceals the real functions of the curriculum and instrumental ideology that underlies both curricula and that leads to a large number of internal incoherencies may be observed in both of them. The presumably conscious lack of means to achieve some of the stated purposes is the most obvious example of the superficiality of these discourses which are, moreover, surprisingly similar.
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Rubin, Griffin. « Constructing a Tower of Babble : An Examination of Purpose in Establishment Clause Jurisprudence ». SMU Law Review Forum 74, no 1 (février 2021) : 1–28. http://dx.doi.org/10.25172/slrf.74.1.1.

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“Purpose” is a key component of modern Establishment Clause jurisprudence. While the Supreme Court has expanded the role purpose plays in various areas of constitutional analysis over the last half-century, the Court seemingly continues to muddy the waters as to purpose’s proper place in Establishment Clause cases. This Comment focuses on the function and operation of purpose in Establishment Clause cases in order to probe the complications and obstacles inherent to this area of constitutional law. By constructing and applying an analytical framework that examines modern Establishment Clause cases through the lenses of “conceptions of purpose,” “evidence of purpose,” and “indicia of impermissible purpose,” this Comment provides critical takeaways about the development and current state of the Establishment Clause—as well as potential future outcomes in these cases. Ultimately, the dispositive consideration in Establishment Clause cases is the utilization and weight given by individual Justices in any given case to the factors discussed in this Comment’s analytical framework. This conclusion demonstrates the judge-dependent nature of these cases and the value certain Justices place on the institutional legitimacy of the Supreme Court and the judicial branch as a whole.
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