Blurring correction in the electro-optical scanning systems on board a spacecraft

The authors analyze the existing ways of blurring elimination. It determines the technique and problem solving procedure of blurring correction in electro-optical scanning systems on board a spacecraft. The proposed technique is implemented at the initial stages of the survey and is based on the optimization of CCD matrix sampling rate according to the maximum of parameters dispersion of brightness image fields. In contrast to the known approaches, brightness differences of adjacent lines of survey route are values to be measured. The results of testing the technique on conditional frames of lines with different degrees of blurring obtained by distorting the signals of a real space image are presented. The authors’ new approach based on the established functional relationship between the level of blurring, survey parameters and errors of their determination was applied for the blurring simulation. The obtained results prove the possibility of reducing the initial blurring of images being formed on board a spacecraft to the magnitude of tenths of a pixel.

Ameliorating process parameters for zeaxanthin yield in Arthrobacter gandavensis MTCC 25325

The present study aims to escalate the production of prophylactic agent zeaxanthin using a screened potential bacterial isolate. For this purpose, a freshwater bacterium capable of producing zeaxanthin was isolated from Bor Talav, Bhavnagar. The 16S rRNA sequence confirmed the isolate as Arthrobacter gandavensis. The bacterium was also submitted to Microbial Type Culture Collection, CSIR-Institute of Microbial Technology, Chandigarh, India, with the accession number MTCC 25325. The chemo-metric tools were employed to optimise the influencing factors such as pH, temperature, inoculum size, agitation speed, carbon source and harvest time on zeaxanthin yield. Thereafter, 6 parameters were narrowed down to 3 factors and were optimised using the central composite design (CCD) matrix. Maximum zeaxanthin (1.51 mg/g) was derived when A. gandavensis MTCC 25325 was grown under pH 6.0, 1.5% (w/v) glucose and 10% (v/v) inoculum size. A high regression coefficient (R2=0.92) of the developed model indicated the accurateness of the tested parameters. To the best of our knowledge, this is the first report on tailoring the process parameters using chemo-metric optimisation for escalating the zeaxanthin production by A. gandavensis MTCC 25325.

Ameliorating process parameters for zeaxanthin yield in Arthrobacter gandavensis MTCC 25325

The present study aims to screen potential bacterial isolates for the production of a prophylactic agent zeaxanthin; which is considered to be an inevitable inclusion in human diet. A freshwater bacterium Arthrobacter gandavensis was isolated from Bor Talav, Bhavnagar and screened as a promising producer of zeaxanthin. The chemo-metric tools were employed to optimize the influencing factors such as pH, temperature, inoculum size, agitation speed, carbon source and harvest time on its yield. Thereafter, 6 parameters were narrowed down to 3 factors and were optimized using the central composite design (CCD) matrix. Maximum zeaxanthin (1.51 mg/g) was derived when A. gandavensis was grown under pH 6.0, 1.5% (w/v) glucose and 10% (v/v) inoculum size. A high regression coefficient ( R 2 =0.92) of the developed model indicated the accurateness with the tested parameters. To the best of our knowledge, this is the first report on tailoring of process parameters using chemo-metric optimization for escalating the zeaxanthin production by A. gandavensis.

Research into Luminance Characteristics of Objects with Architectural Lighting of Central Streets of Tula

The study of luminance distribution over the facades with architectural lighting allows us to estimate the perception of architectural objects, to analyse the quality of light solutions. The relevance of luminance characteristics estimation in night-time urban conditions has been increasing over the years, in particular, for cities where the development direction of lighting environment aims at increase of the number of illuminated objects and where there is no developed strategy of lighting environment development. Using the example of 11 central streets of Tula, the article describes the comprehensive approach to analysis of the quality of architectural lighting. Using a CCD matrix-based luminance meter, the luminance characteristics of facades were estimated.

High-Speed and Wide-Field Photometry with TORTORA

We present the photometric analysis of the extended sky fields observed by the TORTORA optical monitoring system. The technology involved in the TORTORA camera is based on the use of a fast TV-CCD matrix with an image intensifier. This approach can both significantly reduce the readout noise and shorten the focal length following to monitor relatively large sky regions with high temporal resolution and adequate detection limit. The performance of the system has been tested using the relative magnitudes of standard stars by means of long image sequences collected at different airmasses and at various intensities of the moon illumination. As expected from the previous laboratory measurements, artifact sources are negligible and do not affect the photometric results. The following analysis is based on a large sample of images acquired by the TORTORA instrument since July 2006.