Results 31 to 40 of about 5,145,048 (246)

High-index-core Bragg fibers: dispersion properties

Optics Express, 2003
We study the group-velocity-dispersion properties of a novel type of Bragg fibers. These new structures are cylindrically symmetric microstructured fibers having a high-index core (silica in our case), like in conventional photonic crystal fibers, surrounded by a multilayered cladding, which is formed by a set of alternating layers of silica and a ...
Juan, Monsoriu, Enrique, Silvestre, Albert, Ferrando, Pedro, Andrés, Juan, Miret   +4 more
openaire   +2 more sources

Validity of strong lensing statistics for constraints on the galaxy evolution model

, 2007
We examine the usefulness of the strong lensing statistics to constrain the evolution of the number density of lensing galaxies by adopting the values of the cosmological parameters determined by recent WMAP observation.
Akiko Matsumoto, Asada, Augusto, Browne, Bryan, Burud, Chae, Chae, Chae, Choi, Eigenbrod, Eigenbrod, Fassnacht, Fukugita, Inada, Inada, Kochanek, Lacey, Lehár, Lubin, Mao, Mao, Maoz, Mitchell, Morokuma, Muñoz, Myers, Myers, Newman, Ofek, Ofek, Oguri, Pantaik, Patnaik, Ratnatunga, Riess, Rusin, Schechter, Sheth, Sheth, Spergel, Tonry, Toshifumi Futamase, Treu, Turner, York   +45 more
core   +1 more source

Timing and magnitude of regional right ventricular function and their relationship with early hospital mortality in patients with acute pulmonary embolism

Anatolian Journal of Cardiology, 2019
Objective: Right ventricular (RV) dysfunction in acute pulmonary embolism (APE) has been associated with increased mortality and morbidity. The aim of the present study was to assess the timing and magnitude of regional RV functions using speckle ...
Batur Gönenç Kanar, Anıl Şahin, Gökhan Göl, Erhan Oğur, Murat Kavas, Halil Atas, Bülent Mutlu   +6 more
doaj   +1 more source

Towards sustainable growth? A multi-criteria assessment of (changing) urban forms

, 2017
A multi-criteria approach based on descriptive, correlation and multivariate statistics and mathematical morphology was proposed to investigate long-term morphological changes in a metropolitan region (Attica, Greece) representative of the ‘Mediterranean
Silvia Pili, Efstathios Grigoriadis, M. Carlucci, M. Clemente, L. Salvati   +4 more
semanticscholar   +1 more source

Transformation Optics with Photonic Band Gap Media

, 2010
We introduce a class of optical media based on adiabatically modulated, dielectric-only, and potentially extremely low-loss, photonic crystals. The media we describe represent a generalization of the eikonal limit of transformation optics (TO).
David R. Smith, M. Born, P. St. J. Russell, Yaroslav A. Urzhumov   +3 more
core   +1 more source

The electrocardiogram in hypertensive patients. P wave dispersion: a new measure to be considered

Medisur, 2010
The electrocardiogram is a complementary test with high specificity but low sensitivity. In the case of patients with arterial hypertension it is of great importance in the diagnosis, prognosis and monitoring during treatment.
Elibet Chávez González, Emilio González Rodríguez, Jesús Castro Hevia, María Del Carmen Llanes Camacho, Yosvany García Nóbrega, Raimundo Carmona Puerta, Ramiro Ramos Ramírez   +6 more
doaj   +2 more sources

Study on Comprehensive Evaluation Index System for Education E-government Performance of College and University

MATEC Web of Conferences, 2016
First, it sets forth the connotation of education E-government performance evaluation in college and university, Then it illustrates its design principles as directive, complete, scientific, feasible, and development.
Ye Lijuan, Yu Fang, Zhong Jiaming
doaj   +1 more source

Dispersion controlled nanocomposite gradient index lenses

Optics Continuum, 2023
The degrees of freedom afforded by nanocomposite materials and additive manufacturing allow for the precise control over the chromatic properties of gradient index (GRIN) optics. The ability to engineer nanocomposite optical materials using blends of three or more constituents makes it possible to independently specify the refractive index gradient and
George M. Williams, J. Paul Harmon
openaire   +1 more source

Do stellar magnetic cycles influence the measurement of precise radial velocities?

, 2010
The ever increasing level of precision achieved by present and future radial-velocity instruments is opening the way to discovering very low-mass, long-period planets (e.g. solar-system analogs).
Boisse, Bonfils, Bouchy, Brandt, C. Lovis, C. Melo, Cincunegui, Danks, Dravins, Duquennoy, Fernandes, Flower, Golimowski, Halbwachs, Heintz, Huélamo, J. Gomes da Silva, Kürster, Landman, Livingston, Livingston, Lépine, Mayor, Mayor, McMillan, Melo, Meunier, N. C. Santos, Noyes, Paulson, Pepe, Queloz, Queloz, Saar, Saar, Saar, Santos, Santos, Santos, Schaerer, Schaerer, Schaller, Sousa, Tokovinin, Udry, Vaughan, Vaughan, Wright   +47 more
core   +1 more source

The rest-frame UV-to-optical spectroscopy of APM 08279+5255 - BAL classification and black hole mass estimates [PDF]

, 2018
We present the analysis of the rest-frame optical-to-UV spectrum of APM 08279+5255, a well-known lensed broad absorption line (BAL) quasar at $z = 3.911$.
Bischetti, M., Bongiorno, A., Cicone, C., Feruglio, C., Fiore, F., Gallerani, S., Giustini, M., Piconcelli, E., Piranomonte, S., Saturni, F. G., Vietri, G., Vignali, C.   +11 more
core   +2 more sources