scholarly journals Recent Techniques in Solar Optical Astronomy from Space

1968 ◽  
Vol 1 ◽  
pp. 75-93
Author(s):  
E.M. Reeves
Keyword(s):  
Present State ◽  
Optical Materials ◽  
Space Research ◽  
Photographic Film ◽  
Ultraviolet Detectors ◽  
Solar Observations ◽  
Current State ◽  
Instrument Technology ◽  
Far Ultraviolet ◽  
Optical Astronomy

AbstactThe article summarizes some of the recent advances in the techniques of solar space research, particularly over the last 4 years, in an attempt to review the current state of instrument technology. The present state of development in rocket and satellite vehicles for solar observations, far ultraviolet detectors, optical materials, ultraviolet reflection coatings, filters, and photographic film fogging, are among the topics described.

scholarly journals Its present state overmoistened landscape systems of Lviv Region

2014 ◽  
pp. 347-354
Author(s):  
N. Blazhko
Keyword(s):  
Key Words ◽  
Present State ◽  
Environmental Conditions ◽  
Ecological Status ◽  
Ecological Condition ◽  
Wetland Landscape ◽  
Current State ◽  
Destabilizing Factors ◽  
Good Ecological Status ◽  
Stabilizing Factors

Reviewed the current state of wetland landscape systems (PLC) Lviv region. Highlighted areas PLC of good ecological status, with a satisfactory ecological condition and unsatisfactory environmental conditions. Key words: overmoistened landscape systems (OLS)peat, peat, drainage improvement, environmental stabilizing factors, environmental destabilizing factors.

scholarly journals Speckle Interferometry

1989 ◽  
Vol 8 ◽  
pp. 561-562
Author(s):  
J.C. Christou
Keyword(s):  
Near Infrared ◽  
High Spatial Frequency ◽  
Speckle Interferometry ◽  
Short Exposure ◽  
Limited Information ◽  
Interferometric Imaging ◽  
Current State ◽  
Pixel Detectors ◽  
Array Detectors ◽  
Optical Astronomy

Speckle interferometry is a technique which utilizes the full diffraction-limited imaging potential of ground-based telescopes. Short exposure images, or specklegrams, with an exposure time less than that of the atmospheric correlation time (~5- 50 ms) preserve the high-spatial frequency information lost in long exposure imaging. In 1970, Labeyrie computed the power spectrum of a set of specklegrams and showed that they contained diffraction-limited information. Since then the field has grown with improvements in both instrumentation and the phase recovery algorithms necessary for imaging. It has been applied at both visible and near-infrared wavelengths although, until recently, the latter has used slit-scanning techniques with single pixel detectors because of the lack of array detectors. The current state of speckle interferometry has been well covered in the proceedings of two recent joint National Optical Astronomy Observatories – European Southern Observatory workshops on Interferometric Imaging in Astronomy (Oracle, 1987 & Garching, 1988).

The Present State of Autonomous Underwater Vehicle (AUV) Applications and Technologies

2008 ◽  
Vol 42 (1) ◽  
pp. 44-51 ◽  
Author(s):  
J. W. Nicholson ◽  
A. J. Healey
Keyword(s):  
Present State ◽  
Autonomous Underwater Vehicle ◽  
State Of The Art ◽  
Underwater Vehicle ◽  
The State ◽  
Design Features ◽  
Current State ◽  
Do So

AUVs have proved their usefulness in recent years and continue to do so. This paper is a review of the current state of the art of AUVs. Present AUV capabilities are reviewed through a discussion of feasible present-day AUV missions. The state of key AUV design features and sensor technologies is also addressed, identifying those areas most critical to continued future progress in AUV development.

scholarly journals Dammed lakes – Present state of knowledge and research requirements

2012 ◽  
Vol 12 (4) ◽  
pp. 198-205
Author(s):  
Włodzimierz Marszelewski ◽  
Marika Kornaś
Keyword(s):  
Water Management ◽  
Present State ◽  
Quantitative Assessment ◽  
High Potential ◽  
North West ◽  
Qualitative And Quantitative ◽  
Current State

AbstractThe paper presents the current state of knowledge on dammed lakes in Poland and identifies the crucial research necessities in this area. The analysis of documents concerning dammed lakes and information obtained from institutions responsible for water management in Poland were the basis for a preliminary qualitative and quantitative assessment of dammed lakes located in north-west Poland. This allowed the identification of the necessary directions to be taken in the study of dammed lakes. In many cases, the indicated directions are innovative and have high potential for application.

scholarly journals Kyiv’s burial places sacredness

2015 ◽  
pp. 85-88
Author(s):  
A. Marchenko
Keyword(s):  
Present State ◽  
Cultural Significance ◽  
Cultural Characteristics ◽  
Current State ◽  
Sacred Objects ◽  
Sacred Values ◽  
The Dead

This paper considers the burial places of Kyiv and their sacred values. Burial as one of the most ancient and sacred objects is not only the resting place of the dead, but also objects that may reflect cultural characteristics of different times for which they exist. Attention given to consideration cemeteries on the part of the sacred resistance, current state and cultural significance. The article considers the concept of sacred sustainability on example of cemeteries of Kyiv, their present state and its possible improvement or preservation.

scholarly journals The tourist attractiveness of Kharkiv: current state and outlook

2018 ◽  
Keyword(s):  
Present State ◽  
Tourism Development ◽  
Integrated Approach ◽  
Economic Situation ◽  
Scientific Publications ◽  
Current State ◽  
Foreign Tourism ◽  
Tourist Region ◽  
The City

The article analyzes the domestic and foreign tourism scientific publications in order to identify the concept of competitiveness and the concept of tourist attractiveness of the region; analyzes the ways of tourist attractiveness influence and competitiveness on the economic situation in the region and country. The author evaluates the tourist attractiveness of the territory based on an integrated approach and outlines the ways of regulating the regional tourist attractiveness; determines the brand of Kharkiv city and highlights the problems of tourism development in the Kharkiv region; estimates the present state of competitiveness of the region. The author considers the ways of increasing the attractiveness of the Kharkiv region as a tourist region through the formation of the well-known and easily recognizable brand of the city and highlights the ways to promote the city's image.

West African Islamic State (2015–16)

2018 ◽  
pp. 397-402
Author(s):  
Michael Nwankpa
Keyword(s):  
West Africa ◽  
Leadership Style ◽  
Present State ◽  
West African ◽  
Islamic State ◽  
Boko Haram ◽  
Current State ◽  
Global Agenda

Part five of the book presents the current state of Boko Haram as the Islamic State’s official affiliate in West Africa, showing a clear trajectory in the transformation of Boko Haram leadership as Nigerian preachers to Islamic State’s franchise. The chapter reflects on Boko Haram’s journey especially whether its present state could have been avoided if the Nigerian state had responded differently. The reflective mode however shifts towards more realistic assessments that include an analysis of Boko Haram’s quest to regain its original motive and rebrand itself and the contestation between its local and global agenda. This is most visibly reflected in the internal criticisms against Shekau’s leadership style and unhinged attacks especially against Muslims and the recent leadership contest and infighting between the de facto leader, Abubakar Shekau and ISIS-backed al-Barnawi, the son of Boko Haram’s murdered founder, Muhammad Yusuf. The chapter offers prognosis that helps us understand the likely direction that Boko Haram may take and the possible outcomes.

Design and Fabrication of Far-Ultraviolet Reflective Broadband Filter Based on Dielectric Materials

2018 ◽  
Vol 72 (6) ◽  
pp. 943-946 ◽  
Author(s):  
Xiaodong Wang ◽  
Bo Chen ◽  
Ling Yao
Keyword(s):  
Wavelength Range ◽  
Optical Materials ◽  
Design Method ◽  
Dielectric Materials ◽  
Magnesium Fluoride ◽  
Lanthanum Fluoride ◽  
Wide Angle ◽  
Successful Design ◽  
Far Ultraviolet ◽  
High Reflectance

In the far-ultraviolet (UV) region, optical materials are dispersive and absorbing. The previous successful design method utilized in the visible band should be re-examined. We report on the design and fabrication of a far-UV reflective broadband filter based on dielectric materials lanthanum fluoride (LaF3) and magnesium fluoride (MgF2). Extended bandwidth technology is utilized in designing this filter. The obtained filter has a high reflectance in the working wavelength range of 140–180 nm, meanwhile, with good suppression in shorter and longer wavelength regions. In 2016, this filter was employed in a wide-angle aurora imager (WAAI) installed in the Feng Yun III satellite that will be launched in China.

scholarly journals Religion of Dolgans, Nganasans, Nenets and Enets

2019 ◽  
pp. 791-811 ◽  
Author(s):  
Anastasia V. Kistova ◽  
Natalia N. Pimenova ◽  
Ksenia V. Reznikova ◽  
Alexandra A. Sitnikova ◽  
Maria Kolesnik ◽  
...  
Keyword(s):  
Cultural Studies ◽  
Indigenous Peoples ◽  
Present State ◽  
Religious Beliefs ◽  
Field Research ◽  
Krasnoyarsk Krai ◽  
Traditional Form ◽  
Current State ◽  
Indigenous Minorities ◽  
Definition Of

This study examines the peculiarities of traditional religious beliefs of indigenous peoples of the Krasnoyarsk Krai — Dolgans, Nganasans, Nenets and Enets. The authors use comparative historical and historiographical methods, as well as rely on the results of field research conducted by employees of the Department of Cultural Studies at the Humanitarian Institute of Siberian Federal University in the territory of compact residence of these peoples in Krasnoyarsk Krai from 2010 to 2018. The study provides an overview of the main features of the traditional religious beliefs of each of the designated indigenous minorities with the definition of their current state. The results of the study make it possible to determine the general and specific features characteristic of the religious beliefs of Dolgans, Nganasans, Nenets and Enets who live in the Krasnoyarsk Krai, both in their traditional form and in their present state

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