Narrow band interference filters for use in the ultra-violet region

1957 ◽  
Vol 34 (6) ◽  
pp. 253-254
Author(s):  
Barr and Stround Ltd.
2017 ◽  
Vol 13 (1) ◽  
pp. 86-89
Author(s):  
Jweena Bintey Jamal ◽  
Muhammed Ashraful Alam Bhuiyan ◽  
Md Abdul Latif Khan

Introduction: Several treatment options e.g. topical corticosteroids, phototherapy like narrow-band ultra violet B (NB-UVB) and psoralen+ultra violet A (PUVA) etc are available for vitiligo. But none is so effective in single but combined one is more effective and superior. Objective: To compare the efficacy of NB-UVB vs NB-UVB with topical Tacrolimus ointment (0.1%) in the treatment of Vitiligo. Materials and Methods: This descriptive cross-sectional study was conducted in Combined Military Hospital, Dhaka from October 2015 to April 2016. Total 100 patients with vitiligo were divided into 2 groups of 50 patients. NB-UVB was given for 04 weeks to Group-A. In Group-B patients, topical Tacrolimus ointment (0.1%) twice daily was advised with simultaneous NB-UVB. The patients were followed-up at the baseline of the 4th, 8th and 16th week. Results: Majority (46%) of the patients were from 25-34 years of age with a mean age of 27.4±12.6 years. Among all risk factors, Family history of Vitiligo was the most common risk factor and common skin type (Fitzpatrick) was Type IV (40%). At the end of 4th week, maximum cases of Group-B showed good response (score 3) with a mean score of 1.74. Whereas, maximum cases of Group-A showed poor response (score 1) with a mean score of 0.86. End of the 16th week, maximum cases of Group-B improved successfully. In the end, 20% patients of Group-A showed an excellent result; but it was 42% from Group-B. Conclusion: It is revealed from this study that patients treated with a combination of NB-UVB with topical Tacrolimus ointment (0.1%) showed better treatment outcome, more effective and becomes a new mode of treatment. Journal of Armed Forces Medical College Bangladesh Vol.13(1) 2017: 86-89


1995 ◽  
Vol 148 ◽  
pp. 344-346
Author(s):  
S.-G. Lee

AbstractIn order to check the utilisation of 4-degree objective prism spectra for the deep spectroscopic galactic structure study, Rose’s (1984) seven indices between 3500 Å and 4400 Å for 19 Hyades stars were measured on a Kiso Schmidt prism plate, L3496. By comparison with those of Rose (1984), it is found that his spectral indices, Hδ/FeI, Hγ/P(4325), and P(3912)/P(CN) measured on these low dispersion spectra, are still usable. This result gives good prospects for a deep spectroscopic galactic structure program with the 4-degree objective prism and narrow band interference filters.


2005 ◽  
Vol 250 (1-4) ◽  
pp. 195-202 ◽  
Author(s):  
Weidong Gao ◽  
Meiqiong Zhan ◽  
Shuhai Fan ◽  
Janda Shao ◽  
Zheng-Xiu Fan

2008 ◽  
Vol 16 (5) ◽  
pp. 20-27 ◽  
Author(s):  
Jörg Piper

Several color filters have been developed for astronomic use in order to improve image quality in visual observations and astronomic photography. Various positive effects, which can be achieved in astronomic practice, have already been described by several authors, manufacturers and distributors [2, 4, 5, 9, 10, 12]. Monochromatic narrow-band filters are widely used by astronomers. These filters are constructed as interference filters; they select small ranges within the spectrum of the visible light corresponding with characteristic radiation emitted by celestial nebula or the sun and its protuberances. This way, scattered terrestrial radiation caused by “light pollution” and non visible infrared or ultraviolet spectral components are blocked. Fundamental improvements of image quality will result from these filters when refractors or reflector telescopes are fitted with them.


RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35957-35961 ◽  
Author(s):  
Jingjing Liu ◽  
Tengfei Wang ◽  
Fuqiang Nie

An aperiodic plasmoic nanotextured surface with metal-dielectric-metal (MDM) multilayer nanostructure acts as a refractive index (RI) sensor in the ultra-violet light region.


2019 ◽  
Vol 14 (S353) ◽  
pp. 130-133
Author(s):  
Sié Zacharie Kam ◽  
Claude Carignan ◽  
Michel Marcelin ◽  
Philippe Amram ◽  
Jean Koulidiati

AbstractWe present observations on optical emission lines acquired with the scanning Fabry-Perot interferometer of the observatoire du Mont Mégantic, of the Andromeda galaxy (M31). A 765 order Fabry-Perot were used with a fast readout EM-CCD. From data obtained, kinematic maps and data points for the rotation curve of the innermost part of the galaxy are derived. Several dozen of regions have been scanned with the Fabry-Perot interferometer and narrow band interference filters. The central 10’x10’ were scanned with five different filters. Observations have been made in order to get better Hα data for kinematics purposes.


2021 ◽  
Vol 39 (9) ◽  
pp. 607-611
Author(s):  
Zeinab Aryanian ◽  
Neda Shojaee ◽  
Azadeh Goodarzi ◽  
Azar Shirzadian ◽  
Parvaneh Hatami

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