scholarly journals Absolute Velocity and Total Stellar Aberration(II)

2020 ◽  
Vol 17 ◽  
pp. 64-78
Author(s):  
Milos Cojanovic
Keyword(s):  
Solar System ◽  
Short Description ◽  
The Other ◽  
Absolute Velocity ◽  
Exact Position ◽  
Stellar Aberration

In this paper, we will show that in addition to measuring annual and diurnal stellar aberration it is also possible 7 directly to measure the angle of secular aberration caused by the motion of the solar system relative to other 8 stars. In the manuscript [1] we dealt with this problem and gave a short description of a special telescope. Using 9 such a telescope we would be able to measure the exact position of the cosmic objects and thus eliminate errors 10 that occur due to the stellar aberration. Assuming that the tube of the telescope is filled with some optical 11 medium [2], we will show that this does not significantly affect the measurement of the stellar aberration angle, 12 but also that these differences are still large enough to enable us to determine the velocity at which the solar 13 system moves relative to the other stars.

scholarly journals Natural hazards for the Earth's civilization from space, 1. Cosmic ray influence on atmospheric processes

2008 ◽  
Vol 14 ◽  
pp. 281-286 ◽  
Author(s):  
L. I. Dorman
Keyword(s):  
Solar System ◽  
Energetic Particle ◽  
Cosmic Ray ◽  
Short Description ◽  
The Other ◽  
Radiation Hazards ◽  
Atmospheric Processes ◽  
Dust Clouds ◽  
The Earth ◽  
Supernova Explosions

Abstract. In this paper we give a short description of global natural disasters for the Earth's civilization from space: 1) Galactic and solar cosmic ray (CR) influence on the atmospheric processes; 2) Impacts of great space magnetic storms during big Forbush-effects in CR, 3) Impacts of great radiation hazards from solar CR during flare energetic particle events, 4) Great impacts on planetary climate during periods of the Solar system capturing by molecular-dust clouds, 5) Catastrophic disasters from nearby Supernova explosions, and 6) Catastrophic disasters from asteroid impacts on the Earth. Some of these problems have been already studied (see e.g. Dorman, 1957, 1963a, b; Dorman and Miroshnichenko, 1968; Dorman, 1972, 1974, 1975a, b, 1978; Velinov et al., 1974; Miroshnichenko, 2001, 2003; Dorman, 2004, 2006, 2008). We present here a detailed treatment of the first disaster only, leaving to future papers the analysis of the other aspects.

Computer Vision and robotics in postal automation

1999 ◽  
Vol 18 (3-4) ◽  
pp. 265-273
Author(s):  
Giovanni B. Garibotto
Keyword(s):  
Image Processing ◽  
Computer Vision ◽  
Pattern Recognition ◽  
Material Handling ◽  
State Of The Art ◽  
Short Description ◽  
The Other ◽  
Functional Requirements ◽  
Postal Automation ◽  
And Robotics

The paper is intended to provide an overview of advanced robotic technologies within the context of Postal Automation services. The main functional requirements of the application are briefly referred, as well as the state of the art and new emerging solutions. Image Processing and Pattern Recognition have always played a fundamental role in Address Interpretation and Mail sorting and the new challenging objective is now off-line handwritten cursive recognition, in order to be able to handle all kind of addresses in a uniform way. On the other hand, advanced electromechanical and robotic solutions are extremely important to solve the problems of mail storage, transportation and distribution, as well as for material handling and logistics. Finally a short description of new services of Postal Automation is referred, by considering new emerging services of hybrid mail and paper to electronic conversion.

scholarly journals CONSTRAINING THE PREFERRED-FRAME α1, α2 PARAMETERS FROM SOLAR SYSTEM PLANETARY PRECESSIONS

2014 ◽  
Vol 23 (01) ◽  
pp. 1450006 ◽  
Author(s):  
L. IORIO
Keyword(s):  
Binary System ◽  
Solar System ◽  
Relative Motion ◽  
A Priori ◽  
The Other ◽  
Preferred Frame ◽  
General Relativistic ◽  
Ppn Parameters ◽  
Invariable Plane ◽  
Analytical Expressions

Analytical expressions for the orbital precessions affecting the relative motion of the components of a local binary system induced by Lorentz-violating Preferred Frame Effects (PFE) are explicitly computed in terms of the Parametrized Post-Newtonian (PPN) parameters α1, α2. Preliminary constraints on α1, α2 are inferred from the latest determinations of the observationally admitted ranges [Formula: see text] for any anomalous Solar System planetary perihelion precessions. Other bounds existing in the literature are critically reviewed, with particular emphasis on the constraint [Formula: see text] based on an interpretation of the current close alignment of the Sun's equator with the invariable plane of the Solar System in terms of the action of a α2-induced torque throughout the entire Solar System's existence. Taken individually, the supplementary precessions [Formula: see text] of Earth and Mercury, recently determined with the INPOP10a ephemerides without modeling PFE, yield α1 = (0.8±4) × 10-6 and α2 = (4±6) × 10-6, respectively. A linear combination of the supplementary perihelion precessions of all the inner planets of the Solar System, able to remove the a priori bias of unmodeled/mismodeled standard effects such as the general relativistic Lense–Thirring precessions and the classical rates due to the Sun's oblateness J2, allows to infer α1 = (-1 ± 6) × 10-6, α2 = (-0.9 ± 3.5) × 10-5. Such figures are obtained by assuming that the ranges of values for the anomalous perihelion precessions are entirely due to the unmodeled effects of α1 and α2. Our bounds should be improved in the near-mid future with the MESSENGER and, especially, BepiColombo spacecrafts. Nonetheless, it is worthwhile noticing that our constraints are close to those predicted for BepiColombo in two independent studies. In further dedicated planetary analyses, PFE may be explicitly modeled to estimate α1, α2 simultaneously with the other PPN parameters as well.

Art. VII.—Extracts from Report on the Islands and Antiquities of Bahrein

1880 ◽  
Vol 12 (2) ◽  
pp. 189-201
Author(s):  
Durand ◽  
H. C. Rawlinson
Keyword(s):  
Fresh Water ◽  
The Other ◽  
Clear Sky ◽  
Exact Position ◽  
As If

These Islands, from which the Portuguese were expelled by a British fleet aiding Shah Abbas in 1622 A.D., and of which the advantages were tersely put to me by a native the other day in the words, “The land is silver and the sea is pearl,” are situated generally in lat. 26° and long. 50°, the exact position of the Portuguese fort on the larger island being given as lat. 26° 13′ 53„ N., long. 50° 31′ 45„ E. They are surrounded by shoal water on every side, which greatly adds to the beauty of the place. Thus, on looking out to sea on the morning of a clear sky and a fresh nor'-wester, it would seem as if Nature, at all times lavish of effect, had here, however, exhausted every tint of living green in her paint box; and then, wearying of the effort, had splashed an angry streak of purple into the foreground. The water itself is so clear that you can see far down into the coral depths, while springs of fresh water bubble up through the brine, both near the entrance of the harbour and at several other places along the coast.

A search for ‘frozen optical messages’ from extraterrestrial civilizations

2002 ◽  
Vol 1 (1) ◽  
pp. 71-73 ◽  
Author(s):  
R. Weinberger ◽  
H. Hartl
Keyword(s):  
Solar System ◽  
The Other ◽  
Physical Processes ◽  
High Quality ◽  
Sky Surveys ◽  
Systematic Examination ◽  
Other Hand ◽  
Celestial Bodies ◽  
The One

For a quarter of a century we have been engaged in a systematic examination of high-quality photographic (optical) sky surveys in the search for new celestial bodies of various kinds. It took about 5000 hours to cover the whole northern celestial hemisphere and half of the southern one. In total, about 12000 new objects were discovered. From the very beginning of our programme we also searched for objects (or groupings of them) of rather peculiar morphology. The motivation was to detect objects revealing exceptional physical processes, on the one hand, but also to discover constructions possibly created by advanced extraterrestrial civilizations (ETCs), on the other hand. A number of very peculiar objects were indeed found (these were mostly studied in detail later), but none of these appeared likely to be the product of alien masterminds. We may conclude that at least within about 10000–20000 light-years around the Solar system no highly advanced ETCs intend to reveal themselves through such objects.

scholarly journals Concluding lecture

1959 ◽  
Vol 9 ◽  
pp. 398-401
Author(s):  
H. C. Van De Hulst
Keyword(s):  
Solar System ◽  
Galactic Structure ◽  
The Other ◽  
Common Denominator ◽  
The Common

This session contained all the papers that did not fit very well in the other sessions, i.e., those papers dealing neither with the solar system nor directly with problems of galactic structure nor with the faint sources and their statistics. This negative criterion has led to a variety of contributions, the common denominator of which is that we try to find out as much as we can about everything. I shall try to summarize the main points and add my own comments.

scholarly journals Classical Absolute/Differential Programs

1986 ◽  
Vol 7 ◽  
pp. 77-80
Author(s):  
L V Morrison
Keyword(s):  
Solar System ◽  
Ab Initio ◽  
Reference Frames ◽  
Mechanical Systems ◽  
The Other ◽  
Frames Of Reference ◽  
Rotating Frame ◽  
Absolute Differential ◽  
The Galaxy

In astronomy we try to determine a non-rotating frame from analyses of the observed motions of three mechanical systems – the solar system, the galaxy and the extragalactic nebulae. The rotation of the extragalactic frame is of the order 10-10 arcsec per century, so, for all practical purposes, this frame may be regarded as having no rotation. The other two frames are model-dependent and, as such, cannot be regarded ab initio as constituting non-rotation frames of reference. These reference frames are linked by various techniques, as shown in the diagram below.

scholarly journals XII. Radiation in the solar system: its effect on temperature and its pressure on small bodies

1904 ◽  
Vol 202 (346-358) ◽  
pp. 525-552 ◽  
Keyword(s):  
Solar System ◽  
Power Law ◽  
Effective Temperature ◽  
Interplanetary Space ◽  
The Other ◽  
Fourth Power ◽  
The Sun ◽  
Planetary Surfaces ◽  
Solar Constant ◽  
Small Bodies

When a surface is a full radiator and absorber its temperature can be determined at once by the fourth-power law if we know the rate at which it is radiating energy. If it is radiating what it receives from the sun, then a knowledge of the solar constant enables us to find the temperature. We can thus make estimates of the highest temperature which a surface can reach when it is only receiving heat from the sun. We can also make more or less approximate estimates of the temperatures of the planetary surfaces by assuming conditions under which the radiation takes place, and we can determine, fairly exactly, the temperatures of very small bodies in interplanetary space. These determinations require a knowledge of the constant of radiation and of either the solar constant or the effective temperature of the sun, either of which, as is well known, can be found from the other by means of the radiation constant. It will be convenient to give here the values of these quantities before proceeding to apply them to our special problems.

Effects of Simulated Microgravity and UVB on YAP Levels and Expression in Mesenchymal Stem Cells

2020 ◽  
Author(s):  
Kali Jai Woods
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Solar System ◽  
Simulated Microgravity ◽  
The Other ◽  
Space Travel ◽  
State University ◽  
Cell Type ◽  
Inherent Problem ◽  
Effects Of Radiation

The Final Frontier conjures dreams of exploring the great expanse of our solar system, but there is an inherent problem to this vision as space travel negatively impacts the musculoskeletal system. The focus of my research was to study the detrimental effects of radiation and microgravity, two components of space travel, on mesenchymal stem cells through the lens of the yes-associated protein (YAP). Chapter One, discusses our motivation and the goals of our experiments while Chapter Two provides extensive background on the cell type chosen, the known impacts of radiation and microgravity, our model compared with the actual conditions astronauts experience, and a discussion of YAP with its associated pathways. Chapter Three is the manuscript and supplemental, Chapter Four is the conclusion and finally Chapter Five which details some of the other work that I contributed to while at Boise State University.

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