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rss_1.0 Clasificación por Disciplina

Nomenclatura Unesco > (22) Física > (2209) Óptica
(2209.01) Espectroscopía de absorción (2209.02) Cinematografía
(2209.03) Colorimetría (2209.04) Espectroscopía de emisión
(2209.05) Fibras ópticas (2209.06) Óptica geométrica
(2209.07) Holografía (2209.08) Iluminación
(2209.09) Radiación infrarroja (2209.10) Láseres
(2209.11) Luz (2209.12) Microscopios
(2209.13) Óptica no lineal (2209.14) Propiedades ópticas de los sólidos
(2209.15) Optometría (2209.16) Instrumentos fotográficos
(2209.17) Fotografía (2209.18) Fotometría
(2209.19) Óptica física (2209.20) Radiometría
(2209.21) Espectroscopía (2209.22) Radiación ultravioleta
(2209.23) Radiación visible (2209.24) Física de la visión
(2209.90) Tratamiento digital. Imágenes (2209.99) Otras (especificar)

Categorías relacionadas:
(3311.11) Instrumentos ópticos

Mostrando recursos 1 - 20 de 34,480

1. Post Launch Calibration and Testing of the Geostationary Lightning Mapper on GOES-R Satellite - Clarke, Jared; Rafal, Marc; Cholvibul, Ruth
The Geostationary Operational Environmental Satellite R (GOES-R) series is the planned next generation of operational weather satellites for the United States National Oceanic and Atmospheric Administration (NOAA). The National Aeronautics and Space Administration (NASA) is procuring the GOES-R spacecraft and instruments with the first launch of the GOES-R series planned for October 2016. Included in the GOES-R Instrument suite is the Geostationary Lightning Mapper (GLM). GLM is a single-channel, near-infrared optical detector that can sense extremely brief (800 s) transient changes in the atmosphere, indicating the presence of lightning. GLM will measure total lightning activity continuously over the Americas and...

2. Post Launch Calibration and Testing of the Geostationary Lightning Mapper on the GOES-R Satellite - Cholvibul, Ruth W.; Clarke, Jared T.; Rafal, Marc D.
The Geostationary Operational Environmental Satellite R (GOES-R) series is the planned next generation of operational weather satellites for the United States National Oceanic and Atmospheric Administration (NOAA). The National Aeronautics and Space Administration (NASA) is procuring the GOES-R spacecraft and instruments with the first launch of the GOES-R series planned for October 2016. Included in the GOES-R Instrument suite is the Geostationary Lightning Mapper (GLM). GLM is a single-channel, near-infrared optical detector that can sense extremely brief (800 microseconds) transient changes in the atmosphere, indicating the presence of lightning. GLM will measure total lightning activity continuously over the Americas and...

3. Quantification of Residual Stress from Photonic Signatures of Fused Silica - Yost, William E.; Cramer, K. Elliott; Hayward, Maurice
A commercially available grey-field polariscope (GFP) instrument for photoelastic examination is used to assess impact damage inflicted upon the outer-most pane of Space Shuttle windows made from fused silica. A method and apparatus for calibration of the stress-optic coefficient using four-point bending is discussed. The results are validated on known material (acrylic) and are found to agree with literature values to within 6%. The calibration procedure is then applied to fused-silica specimens and the stress-optic coefficient is determined to be 2.43 +/- 0.54 x 10(exp -12)/Pa. Fused silica specimens containing impacts artificially made at NASA's Hypervelocity Impact Technology Facility (HIT-F),...

4. Fiber Optic Sensing System (FOSS) - Parker, Allen R.
This presentation and video is a description of the FOSS portfolio and discusses the recent improvements to the current technology.

5. Fiber Optic Sensing System from NASA Armstrong Flight Research Center (FOSS) - Parker, Allen R.
This presentation and video is a description of the FOSS portfolio and discusses the recent improvements to the current technology.

6. Long-Term Outcomes of Trabeculectomy Augmented with Mitomycin C Undertaken within the First 2 Years of Life. - Jayaram, H; Scawn, R; Pooley, F; Chiang, M; Bunce, C; Strouthidis, NG; Khaw, PT; Papadopoulos, M
PURPOSE: To evaluate the long-term effectiveness and safety of mitomycin C (MMC)-augmented trabeculectomy undertaken within the first 2 years of life for the surgical management of glaucoma. DESIGN: Retrospective, consecutive, noncomparative case series. PARTICIPANTS: All children who underwent MMC-augmented trabeculectomy within 2 years of birth between May 2002 and November 2012. METHODS: The medical records of 40 consecutive eyes of 26 children who underwent surgery by a single surgeon were reviewed. Data collected during routine clinical care were analyzed. MAIN OUTCOME MEASURES: Assessment of clinical outcomes included intraocular pressure (IOP), final visual acuity, bleb morphology, surgical complications (early and late), postoperative...

7. Histopathology and molecular characterisation of intrauterine-diagnosed congenital craniopharyngioma. - Scagliotti, V; Avagliano, L; Gualtieri, A; Graziola, F; Doi, P; Chalker, J; Righini, A; Korbonits, M; Bulfamante, G; Jacques, TS; Massa, V; Gaston-Massuet, C
PURPOSE: Adamantinomatous craniopharyngiomas (aCPs) are complex epithelial neoplasms that arise from the progenitors of the pituitary gland. Although benign, these tumours can be locally aggressive invading vital neighbouring structures such as the hypothalamus, the cranial and optic nerves. Congenital forms of aCPs diagnosed during foetal development are very rare. The purpose of this article is to present with a histopathological and molecular characterisation of congenital craniopharyngioma. METHODS: Here we report a case of in utero diagnosed aCP, detected at 21 weeks of gestation by ultrasound, visualised by MRI at 22 weeks and histologically diagnosed at 23 weeks. We provide with histopathological characterisation of...

8. Identification and Correction of Mechanisms Underlying Inherited Blindness in Human iPSC-Derived Optic Cups - Parfitt, DA; Lane, A; Ramsden, CM; Carr, AJF; Munro, PM; Jovanovic, K; Schwarz, N; Kanuga, N; Muthiah, MN; Hull, S; Gallo, JM; da Cruz, L; Moore, AT; Hardcastle, AJ; Coffey, PJ; Cheetham, ME
© 2016 The Authors. Leber congenital amaurosis (LCA) is an inherited retinal dystrophy that causes childhood blindness. Photoreceptors are especially sensitive to an intronic mutation in the cilia-related gene CEP290, which causes missplicing and premature termination, but the basis of this sensitivity is unclear. Here, we generated differentiated photoreceptors in three-dimensional optic cups and retinal pigment epithelium (RPE) from iPSCs with this common CEP290 mutation to investigate disease mechanisms and evaluate candidate therapies. iPSCs differentiated normally into RPE and optic cups, despite abnormal CEP290 splicing and cilia defects. The highest levels of aberrant splicing and cilia defects were observed in...

9. Dynamic wavefront shaping with an acousto-optic lens for laser scanning microscopy - Konstantinou, G; Kirkby, PA; Evans, GJ; Nadella, KMNS; Griffiths, VA; Mitchell, JE; Silver, RA

10. Ischemic Changes in a Case of Unilateral Pseudoexfoliation Syndrome - Tolga Kocaturk
A 66 year old man with normotensive unilateral pseudoexfoliation syndrome associated with ipsilateral marked ischemia with nerve fiber layer thinning and nasal step on successive visual field tests mimicking glaucomatous visual field loss is presented. Although the optic disc appearance of the clinically visible pseudoexfoliative left eye was not suggestive of glaucomatous cupping the disc appeared much pale and retinal vessels narrowed compared to the right eye. Color Doppler imaging of the left ophthalmic artery showed extremely high resistivity index of 0.88. The case is discussed in light of recent literature underscoring the fact that pseudoexfoliation is a cause of...

11. Optic Neuropathy Secondary to an Onodi Cell Mucocele in a Child - Emine Cinici
Onodi cell is intimately related to the optic nerve. Onodi cell pathologies may result compressive optic neuropathy and poor visual outcome. We have identified for the first time in the 13-year-old male patient retrobulbar optic neuropathy caused by mucocele in an Onodi cell. This case presented with headaches and progressive loss of vision in his both eye within ten days. Multi-slice paranasal computed tomography and cranial magnetic resonance imaging showed a retention cyst (Onodi cell mucocele) that arouse from left component of the sphenoid sinus, and Onodi cell inflammation. The patient was treated successfully by elective transnasal sphenoethmoidectomy without any...

12. Platelet Indices in Patients with Nonarteritic Anterior Ischemic Optic Neuropathy - Onur Polat
Aim: Platelet indices are able to influence thromboembolic and vascular diseases. Elevated platelet volume is associated with increased platelet activity and thrombotic events. Nonarteritic anterior ischemic optic neuropathy (NAION) is considered as a disease of vascular origin. In this study, we aimed to evaulate platelet indices in patients with NAION. Material and Method: Forty one patiens diagnosed with NAION in our clinic between February 2007 %u2013 November 2014 were reviewed retrospectively. Age and sex matched 40 patients without any systemic disease who were operated for cataract extraction generated control group. NAION patients without systemic diseases were evaulated in subgroup analysis....

13. Comparasion of Optic Nerve Head with Stereophotometric and Scanning Laser Ophthalmoscopic Imaging - Serek Tekin
Aim: To compare theevaluation results of two experienced clinicians about examination of optic discs in glaucoma patients and healthy inidividuals by stereophotometry and scanning laser ophthalmoscopy. Material and Method: We studied 116 individuals (217 eyes) who were divided as normal, glaucoma and suspected glaucoma in numbers of 54, 42 and 20 respectively. Stereophotometric photographs of optic disc were examined with fundus camera (Zeiss, FF 450 plus). Optic disc was also evaluated with HRT-3 in the same visit. Two experienced clinicians evaluated the cup/disc ratios and whether the optic discs were glaucomatous or not. Evaluation results were analysed and compared with...

14. Comparasion of Optic Nerve Head with Stereophotometric and Scanning Laser Ophthalmoscopic Imaging - Serek Tekin
Aim: To compare theevaluation results of two experienced clinicians about examination of optic discs in glaucoma patients and healthy inidividuals by stereophotometry and scanning laser ophthalmoscopy. Material and Method: We studied 116 individuals (217 eyes) who were divided as normal, glaucoma and suspected glaucoma in numbers of 54, 42 and 20 respectively. Stereophotometric photographs of optic disc were examined with fundus camera (Zeiss, FF 450 plus). Optic disc was also evaluated with HRT-3 in the same visit. Two experienced clinicians evaluated the cup/disc ratios and whether the optic discs were glaucomatous or not. Evaluation results were analysed and compared with...

15. ANALYSIS OF OPTIC DISC AND PERIPAPILLARY AREA USING OPTICAL COHERENCE TOMOGRAPHY IN YOUNG ADULT INDIAN MYOPIC EYES AT AMBEDKAR MEDICAL COLLEGE - Rani; Aabid
INTRODUCTION A specific objective of the study was to look for correlations between myopia and optic disc measurements obtained by Primus SD-OCT. Retinal nerve fibre layer thickness was measured by Primus SD-OCT in both normal and myopic eyes. MATERIAL & METHODS This is a cross-sectional case control study conducted over a period of 18 months from July, 2014 to December, 2015 at DR. B. R. Ambedkar Medical College and Hospital, Bangalore, India on analysis of optic disc and peripapillary area using Primus spectral domain OCT in young Indian adult myopic eyes. A total of 108 eyes were studied in...

16. CARACTERIZACIÓN QUÍMICA Y MINERALÓGICA DE LAS CROMITAS DE LA ZONA DE BELLO Y SAN PEDRO (DEPARTAMENTO DE ANTIOQUIA) - Camilo Andres Quintero G.; Emigdio Segura; Edgar Delgado M.
Se caracterizaron químicamente cinco muestras de cromita de los municipios de Bello y San Pedro (Antioquia) en forma semicuantitativa (Análisis Espectrográfico) y cuantitativa (Absorción Atómica y Espectroscopia de Emisión con fuente de plasma de Acoplamiento Inductivo); la caracterización mineralógica de las muestras se realizó mediante DRX, ATG y ATD, Microscopía Óptica y Microscopía Electrónica de Barrido con análisis por microsonda SEM-EDS, Estos resultados muestran la factibilidad de utilizar las cromitas de estos sectores como materia prima refractaria por poseer características químicas similares a las cromitas de Cuba o Filipinas que se explotan en la actualidad.

17. Sola romani: morteros hidráulicos romanos en la Península Ibérica - Guerra García, Pablo
En esta investigación se han analizado morteros de cal de cronología romana en el interior de la Península Ibérica. Para ello, se seleccionó una serie de muestras procedentes de diversos yacimientos, y de estructuras de carácter industrial. Estas muestras presentan aditivos cerámicos y conglomerantes de cal, como característica principal. Desde un principio el esfuerzo debía de centrarse en los fragmentos cerámicos presentes en los morteros. Para ello se documentaron varios morteros con aditivos cerámicos, a fin de conocer sus características básicas (componentes, distribución, micro-estratigrafía, granulometría, etc.). Por ello, y una vez tomadas las muestras, ésta fueron tratadas y procesadas para...

18. Characterization of groundwater dynamics in an heterogeneous karstic aquifer through active and passive Fiber Optic DTS methods - Bour, Olivier; Le Lay, Hugo; Lavenant, Nicolas; Simon, Nataline; Bodin, Jacques; Guihéneuf, Nicolas; Nauleau, Benoît; Porel, Gilles; Le Borgne, Tanguy
International audience

19. Ecografía orbitaria con medición de nervio óptico aplicada a la esclerosis múltiple - Pérez Sánchez, Soledad
La esclerosis múltiple es una enfermedad inflamatoria desmielinizante que afecta al sistema nervioso central. Se ha convertido en una de las principales causas de discapacidad en adultos jóvenes, pues la edad habitual de aparición es entre los 20 y los 40 años. Las lesiones del SNC detectadas en la enfermedad se caracterizan por la disrupción de la barrera hematoencefálica, inflamación, desmielinización, pérdida de oligodendrocitos, gliosis reactiva y degeneración neuronal/axonal. La pérdida neuronal/axonal progresiva se considera la causa más importante de discapacidad neurológica en la esclerosis múltiple. Hasta ahora, se ha enfocado el control de la enfermedad en la inflamación, teniendo...

20. Caracterización teórica y experimental de un reactor de lecho fluidizado para operaciones de termoquímica solar - Matarranz Alcalá, Roberto
El objetivo del presente trabajo es la caracterización, tanto teórica como experimental, de un reactor de lecho fluidizado para operaciones de termoquímica solar. En el apartado experimental se emplea un reactor de lecho fluidizado cedido por el CIEMAT. Para la parte numérica, se realiza un análisis óptico-energético y un estudio termofluidodinámico (dinámica de fluidos computacional, DFC). Se llevan a cabo ensayos en frío y en caliente para la parte experimental. Los ensayos en frío tienen el objetivo de demostrar la teoría establecida de fluidización, usando partículas de alúmina y ferritas de níquel. Los ensayos en caliente se realizan para observar el...

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