scholarly journals Photometric Analysis of Pi of the Sky Data

10.14311/1712 ◽  
2013 ◽  
Vol 53 (1) ◽  
Author(s):  
Rafał Opiela ◽  
Katarzyna Małek ◽  
Lech Mankiewicz ◽  
Małgorzata Siudek ◽  
Marcin Sokołowski ◽  
...  
Keyword(s):  
Variable Stars ◽  
Field Of View ◽  
Large Field ◽  
Photometric Analysis ◽  
Bright Object ◽  
Adequate Quality ◽  
Fully Automatic ◽  
The Individual ◽  
New Procedures

Two fully automatic Pi of the Sky detectors with a large field of view, located in Spain (INTA) and in Chile (SPDA) observe the sky in search of rare optical phenomena, and also collect observations which include many kinds of variable stars. To be able to draw proper conclusions from the data that is received, adequate quality of the detectors is very important. Pi of the Sky data are subject to systematic errors caused by various factors, e.g. cloud cover seen as significant fluctuations in the number of stars observed by the detector, problems with conducting mounting, a strong background of the moon or the passage of a bright object, e.g. a planet, near the observed star. Some of these adverse effects are already detected during cataloging of the individual measurements, but this is not sufficient to make the quality of the data satisfactory for us. In order to improve the quality of our data, we developed two new procedures based on two different approaches. In this paper we will say some words about these procedures, give some examples, and show how these procedures improve the quality of our data.

scholarly journals PHOTOMETRIC ANALYSIS OF PI OF THE SKY DATA

2014 ◽  
Vol 54 (3) ◽  
pp. 225-230
Author(s):  
Rafał Opiela ◽  
Katarzyna Małek ◽  
Lech Mankiewicz ◽  
Małgorzata Siudek ◽  
Marcin Sokołowski ◽  
...  
Keyword(s):  
Large Fraction ◽  
Variable Stars ◽  
Wide Field ◽  
Autonomous Operation ◽  
San Pedro ◽  
Bright Object ◽  
Robotic Telescopes ◽  
Adequate Quality ◽  
New Procedures

Pi of the Sky is a system of two wide field of view robotic telescopes, which search for short timescale astrophysical phenomena, especially for prompt optical GRB emissions. The system was designed for autonomous operation, monitoring a large fraction of the sky with 12m–13m range and time resolution of the order of 1–10 seconds. Two fully automatic Pi of the Sky detectors located in Spain (INTA — INTA El Arenosillo Test Centre in Mazagón, near Huelva.) and Chile (SPDA — San Pedro de Atacama Observatory.) have been observing the sky almost every night in search of rare optical phenomena. They also collect a lot of useful observations which include e.g. many kinds of variable stars. To be able to draw proper conclusions from the data received, adequate quality of the data is very important. Pi of the Sky data is subject to systematic errors caused by various factors, such as cloud cover, seen as significant fluctuations in the number of stars observed by the detector, problems with conducting mounting, a strong background of the moon or the passing of a bright object, e.g., a planet, near the observed star. Some of these adverse effects have already been detected during the cataloging of individual measurements, but the quality of our data was still not satisfactory for us. In order to improve the quality of our data, we have developed two new procedures based on two different approaches. In this article we will report on these procedures, give some examples, and we will show how these procedures improve the quality of our data.

Apochromatic Collimator Objective Lens Design with Big Field of View

2013 ◽  
Vol 710 ◽  
pp. 413-418
Author(s):  
Fei Guo ◽  
Mei Zhao ◽  
Mai Yu Zhou ◽  
Ming Quan Yang ◽  
Shan Shan Cong
Keyword(s):  
Image Quality ◽  
Structural Parameters ◽  
Optical Design ◽  
Field Of View ◽  
Practical Significance ◽  
Large Field ◽  
Objective Lens ◽  
Initial Structure ◽  
Core Part

Objective lens is the core part of a collimator, its quality has a direct impact on the collimators quality. Due to the small field of view and low image quality requirement, general collimator objective lens is difficult to achieve the requirement of testing an aerial camera s performance. So designing a large field of view, apochromatic collimator objective lens has an important practical significance. In this paper, the major qualifications were first proposed to design the collimator objective lens,according to which the initial configuration was confirmed. Then we used the ZEMAX optical design software to optimize the initial structure and normalized the optimized structural parameters. Finally the image quality of collimator objective lens was evaluated to make it achieve the requirement of qualifications.

Bernhard Schmidt and the Schmidt Telescope for Mapping the Sky

2011 ◽  
Vol 20 (2) ◽  
Author(s):  
G. Wolfschmidt
Keyword(s):  
World War Ii ◽  
Focal Length ◽  
Field Of View ◽  
Large Field ◽  
World War ◽  
Schmidt Telescope ◽  
Sky Surveys ◽  
Short Focal Length ◽  
Calar Alto

AbstractBernhard Voldemar Schmidt (1879-1935) was born in Estonia. He ran an optical workshop in Mittweida, Saxonia, between 1901 and 1927. Astronomers appreciated the quality of his telescopes. Starting in 1925, working freelance in Hamburg Observatory, he developed a short focal length optical system with a large field of view. He succeeded in inventing the “Schmidt Telescope” in 1930, which allows the imaging a large field of the sky without any distortions. Shortly after Schmidt’s death, the director of the observatory published details on the invention and production of the Schmidt Telescope. After World War II, Schmidt telescopes have been widely used. The first large Schmidt telescope was built in 1948, the “Big Schmidt” (126 cm), Mount Palomar, USA. Schmidt telescopes are also important tools for cosmology. The result of the Palomar Observatory Sky Surveys (1949-1958, 1985-1999) is a data base of about 20 million galaxies and over 100 million stars, supplemented in 1971 by the ESO Schmidt for the southern sky. Also high resolution spectrometers can be fitted to the Schmidt telescope. The 80 cm Schmidt telescope of Hamburg Observatory, planned since 1936, finished 1955, is on Calar Alto, Spain, since 1975. Combined with two objective prisms, it was used for a Quasar survey project.

Thrombus Imaging with 99mTc-Hmpao-Labeled Platelets and 111In-Labeled Monoclonal Antifibrin Antibodies

1993 ◽  
Vol 34 (1) ◽  
pp. 59-63 ◽  
Author(s):  
M. S. Vorne ◽  
T. T. Honkanen ◽  
T. J. Lantto ◽  
R. O. Laitinen ◽  
K. J. Karppinen ◽  
...  
Keyword(s):  
Venous Thrombosis ◽  
Deep Venous Thrombosis ◽  
Gamma Camera ◽  
Lower Extremities ◽  
Field Of View ◽  
Large Field ◽  
Thrombus Imaging ◽  
99Mtc Hmpao

Eighteen patients with suspicion of deep venous thrombosis (DVT) in the lower extremities were imaged both with autologous 99mTc-HMPAO-labeled platelets (Tc-PLT) and 111In-labeled monoclonal antifibrin antibodies (In-MoAbs) on the same day. Presence or absence of thrombosis was verified by venography. Tc-PLT was given i.v. followed after 30 min by In-MoAbs. Anterior and posterior projections of the lower extremities were obtained with a large field-of-view gamma camera at 5 to 25 min, 2 h, 4 to 6 h, and 20 h after administration of the marker. Both Tc-PLT and In-MoAbs detected DVT well but less frequently than venography. Thrombi were visualized at 2 to 4 h after injection. The quality of images was better with Tc-PLT than with In-MoAbs. In the patients treated during the study, heparin significantly (p < 0.01) inhibited the uptake of Tc-PLT but not of In-MoAbs. We conclude that both Tc-PLT and In-MoAbs are suitable agents for the detection of DVT especially in patients without anticoagulation.

scholarly journals Analysis and Simulation of the Pi of the Sky Detector Response

10.14311/1484 ◽  
2011 ◽  
Vol 51 (6) ◽  
Author(s):  
L. W. Piotrowski ◽  
A. F. Zarnecki
Keyword(s):  
Gamma Ray ◽  
Variable Stars ◽  
Field Of View ◽  
Large Field ◽  
Detector Response ◽  
Light Sources ◽  
Careful Study ◽  
Point Spread ◽  
Spread Function ◽  
Optical Flashes

The Pi of the Sky project observes optical flashes of astronomical origin and other light sources variable on short timescales, down to tens of seconds. We search mainly for optical emissions of Gamma Ray Bursts, but also for variable stars, blazars, etc. Precise photometry with a very large field of view (20?×20?) requires a careful study and modelling of a point spread function (PSF), as presented in this paper.

Semi-automated methods for 3-D reconstruction of macromolecular complexes

1995 ◽  
Vol 53 ◽  
pp. 42-43
Author(s):  
B. Carragher ◽  
M. Whittaker
Keyword(s):  
Three Dimensional ◽  
Time Saving ◽  
Macromolecular Complexes ◽  
Symmetry Properties ◽  
Dimensional Reconstruction ◽  
Experienced Operator ◽  
Projection Images ◽  
The Individual ◽  
Natural Symmetry

Techniques for three-dimensional reconstruction of macromolecular complexes from electron micrographs have been successfully used for many years. These include methods which take advantage of the natural symmetry properties of the structure (for example helical or icosahedral) as well as those that use single axis or other tilting geometries to reconstruct from a set of projection images. These techniques have traditionally relied on a very experienced operator to manually perform the often numerous and time consuming steps required to obtain the final reconstruction. While the guidance and oversight of an experienced and critical operator will always be an essential component of these techniques, recent advances in computer technology, microprocessor controlled microscopes and the availability of high quality CCD cameras have provided the means to automate many of the individual steps.During the acquisition of data automation provides benefits not only in terms of convenience and time saving but also in circumstances where manual procedures limit the quality of the final reconstruction.

Cancer pain management

2014 ◽  
Vol 155 (3) ◽  
pp. 93-99
Author(s):  
Péter Heigl
Keyword(s):  
Quality Of Life ◽  
Pain Management ◽  
Pain Relief ◽  
Life Expectancy ◽  
Cancer Pain ◽  
Cancer Pain Management ◽  
Medical Activity ◽  
Short Summary ◽  
Adequate Quality

Pain is a significant and alarming symptom of cancer seriously affecting the activity and quality of life of patients. Recent research proved that inadequate analgesia shortens life expectancy. Therefore, pain relief is not only a possibility but a professional, ethical and moral commitment to relieve patients from suffering, as well as ensure their adequate quality of life and human dignity. Proper pain relief can be achieved with medical therapy in most of the cases and the pharmacological alternatives are available in Hungary. Yet medical activity regarding pain relief is far from the desired. This paper gives a short summary of the guidelines on medical pain management focusing particularly on the use of opioids. Orv. Hetil., 2014, 155(3), 93–99.

Manageable Self in the Early Hellenistic Era

2010 ◽  
Vol 39 (2) ◽  
pp. 34-36
Author(s):  
Vaia Touna
Keyword(s):  
Social Economic ◽  
Ancient Greece ◽  
The Self ◽  
Hellenistic Period ◽  
Political Conditions ◽  
The Individual

This paper argues that the rise of what is commonly termed "personal religion" during the Classic-Hellenistic period is not the result of an inner need or even quality of the self, as often argued by those who see in ancient Greece foreshadowing of Christianity, but rather was the result of social, economic, and political conditions that made it possible for Hellenistic Greeks to redefine the perception of the individual and its relationship to others.

Reflecting the Sky in Water

2017 ◽  
Vol 3 (1) ◽  
pp. 112-126 ◽  
Author(s):  
Ilaria Cristofaro
Keyword(s):  
The Unconscious ◽  
Related Case ◽  
Quality Of Water ◽  
Fluid Properties ◽  
Phenomenological Perspective ◽  
Auto Ethnography ◽  
The Individual ◽  
Artificial Water ◽  
Land Water

From a phenomenological perspective, the reflective quality of water has a visually dramatic impact, especially when combined with the light of celestial phenomena. However, the possible presence of water as a means for reflecting the sky is often undervalued when interpreting archaeoastronomical sites. From artificial water spaces, such as ditches, huacas and wells to natural ones such as rivers, lakes and puddles, water spaces add a layer of interacting reflections to landscapes. In the cosmological understanding of skyscapes and waterscapes, a cross-cultural metaphorical association between water spaces and the underworld is often revealed. In this research, water-skyscapes are explored through the practice of auto-ethnography and reflexive phenomenology. The mirroring of the sky in water opens up themes such as the continuity, delimitation and manipulation of sky phenomena on land: water spaces act as a continuation of the sky on earth; depending on water spaces’ spatial extension, selected celestial phenomena can be periodically reflected within architectures, so as to make the heavenly dimension easily accessible and a possible object of manipulation. Water-skyscapes appear as specular worlds, where water spaces are assumed to be doorways to the inner reality of the unconscious. The fluid properties of water have the visual effect of dissipating borders, of merging shapes, and, therefore, of dissolving identities; in the inner landscape, this process may represent symbolic death experiences and rituals of initiation, where the annihilation of the individual allows the creative process of a new life cycle. These contextually generalisable results aim to inspire new perspectives on sky-and-water related case studies and give value to the practice of reflexive phenomenology as crucial method of research.

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