Results 41 to 50 of about 2,036,415 (295)

Sistema fotovoltaico de iluminación solar [PDF]

Epistemus, 2013
El artículo es el resultado de un trabajo de investigación enfocado al uso de sistemas fotovoltaicos para la iluminación por medio de diodos emisores de luz tipo LED.
Víctor Hugo Benítez Baltazar, Guadalupe Araceli Torres Valverde, Luis Armando Gámez Valdéz, Jesús Horacio Pacheco Ramírez   +3 more
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"Encore à cet astre", de Jules Laforgue, y "Desnudo bajando una escalera, nº2", de Marcel Duchamp: la muerte del idealismo solar

Poligramas, 2017
Entre noviembre y diciembre de 1911, Marcel Duchamp realiza en Neuilly tres dibujos sobre papel que ilustran, mediante un lenguaje esquivo y harto sumario, otros tantos poemas del simbolista francés Jules Laforgue: Médiocrité; Siesteéternelle; y Encore à
Pedro A. Cruz Sánchez
doaj   +1 more source

A Variational Principle for the Asymptotic Speed of Fronts of the Density Dependent Diffusion--Reaction Equation

, 1994
We show that the minimal speed for the existence of monotonic fronts of the equation $u_t = (u^m)_{xx} + f(u)$ with $f(0) = f(1) = 0$, $m >1$ and $f>0$ in $(0,1)$ derives from a variational principle.
A. Kolmogorov, D. G. Aronson, D. G. Aronson, D. G. Aronson, J. J. E. Herrera, L. E. Vulis, M. C. Depassier, R. D. Benguria, R. D. Benguria, S. K. Scott, W. I. Newman, W. I. Newman   +11 more
core   +1 more source

Sols contaminés, sols à décontaminer

, 1996
La décontamination des sols pollués, phénomène longtemps occulté, est devenu une préoccupation majeure des pouvoirs publics et des industries. Les Pays-Bas et la Région flamande ont déjà légiféré dans ce domaine. La République fédérale d'Allemagne est sur le point de le faire.
CÉDRE (Centre d'étude du droit de l'environnement), SERES (Séminaire de droit de l'urbanisme et de l'environnement) - UCL   +1 more
openaire   +1 more source

Effect of Laser Deoxidation on Adhesive‐Bonded Aluminum in an Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
This study investigates laser ablation of aluminum under oxygen‐free conditions. The goal is to produce oxide‐free substrates that enable improved adhesive bonding with epoxy. Optimized laser parameters (90% overlap, 300 µJ) combined with oxide‐free substrates result in the highest tensile strength of the adhesive bond.
Sandra Gerland, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Ludger Overmeyer, Annika Raatz   +5 more
wiley   +1 more source

On the Origin of Traveling Pulses in Bistable Systems

, 1997
The interaction between a pair of Bloch fronts forming a traveling domain in a bistable medium is studied. A parameter range beyond the nonequilibrium Ising-Bloch bifurcation is found where traveling domains collapse.
A. Hagberg, B.A. Malomed, Bhattacharjee, Bode, Buckmaster, C. Elphick, Coullet, Coullet, Coullet, Cross, Curado, E. Meron, Eiswirth, Elphick, Elphick, Elphick, Frisch, Frisch, Gershuni, Gil, Haas, Hagberg, Haim, Ikeda, Kelly, Korzinov, Kuramoto, Lee, Lowe, Malomed, Malomed, Malomed, Migler, Nasuno   +33 more
core   +1 more source

Novel Tailoring of Ternary ZnS‐MXene‐TiO2 Nanocomposite Heterojunction and Its Tunable Electrochemical Properties With Enhanced Photocatalytic Degradation

Advanced Engineering Materials, EarlyView.
ZnS‐MXene‐TiO2 nanocomposite heterojunction for photocatalytic decomposition of this methylene blue dye (MB) greatly improves light absorption, charge separation, and active site area. Two‐dimensional MXene forms nanocomposites by easily combining them with 0D (quantum dots), 1D (tube and wire), 2D (plane and sheet), and 3D (particle and lamellar ...
Latiful Kabir, Dohyun Kim, Minho Song, Jae Doc Na, Young Jun Joo, Kwang Youn Cho, Karna Wijaya, Won‐Chun Oh   +7 more
wiley   +1 more source

Pattern selection as a nonlinear eigenvalue problem

, 1996
A unique pattern selection in the absolutely unstable regime of driven, nonlinear, open-flow systems is reviewed. It has recently been found in numerical simulations of propagating vortex structures occuring in Taylor-Couette and Rayleigh-Benard systems ...
A. Bers, A. Davey, A. Recktenwald, A. Tsameret, A. Tsameret, D. J. Takeuchi, D. Roth, G. Ahlers, G. Ahlers, G. Dee, G. W. Baxter, H. Kuhlmann, H. Riecke, H. W. Müller, H. W. Müller, H. W. Müller, I. Rehberg, J. Fineberg, K. C. Chung, K. L. Babcock, K. L. Babcock, K. L. Babcock, K. Nozaki, K. Nozaki, K. S. Gage, M. C. Cross, M. C. Cross, M. Lücke, M. Lücke, M. Lücke, M. Lücke, P. Huerre, P. Kolodner, R. Conte, R. E. Kelly, R. Heinrichs, R. Heinrichs, R. J. Briggs, R. J. Deissler, R. Tagg, V. Croquette, W. Saarloos van   +41 more
core   +1 more source

Incorporation of Selenium into Sol–Gel‐Derived Bioactive Glass: Influence on Glass Structure, Bioactivity, and its Selective Cytotoxicity

Advanced Engineering Materials, EarlyView.
Selenium was incorporated into a sol–gel‐derived bioactive glass to enable sustained therapeutic ion release. The selenium‐containing glass preserved bioactivity while selectively inducing cytotoxicity in osteosarcoma cells and maintaining osteoblastic viability.
Breno Rocha Barrioni, Thalita Marcolan Valverde, Talita Martins, Guilherme Mattos Jardim Costa, Alfredo Miranda de Goes, Marcello Rosa Dumont, Eduardo Henrique Martins Nunes, Marivalda de Magalhães Pereira   +7 more
wiley   +1 more source

Sol, Tierra y Luna. Movimientos relativos y sus consecuencias

Revista Eureka sobre Enseñanza y Divulgación de las Ciencias, 2011
Cuando se pregunta a los estudiantes por la causa de las estaciones suelen responder: "en verano estamos más próximos al Sol y en invierno estamos más lejos del Sol".
Sebastián Cardenete García
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