scholarly journals Warning of Potential Collision for Vehicles

2015 ◽  
Vol 9 (1) ◽  
pp. 806-811
Author(s):  
Huang Yue ◽  
Qin Gui He ◽  
Liu Tong ◽  
Sun Ning ◽  
Wang Xiao Dan
Keyword(s):  
Short Range ◽  
Occurrence Rate ◽  
Collision Warning ◽  
Moving Vehicle ◽  
Warning Messages ◽  
Long Period ◽  
The Past ◽  
Straight Line ◽  
Short Period ◽  
Short Time

A moving vehicle may very likely run into accidents. The occurrence rate of accidents would be largely reduced if the driver is warned in advance, even only 0.5 s earlier. For a running vehicle, the driving route within short time before collision has the characteristic of Markov. In this case, the coordinates of position only have to be considered within a short range, rather than the running status during the past long period. Within short period before collision, the driving route can be basically divided into two states: a straight line and a binomial curve. In this paper, a mechanism is proposed for sending collision warning messages to running vehicles.

HREM Observations of Mg2Si-Based Multilayers for Soft X-Ray Optics

1991 ◽  
Vol 49 ◽  
pp. 906-907
Author(s):  
A. R. Modak ◽  
David J. Smith ◽  
Z. G. Li ◽  
P. Boher ◽  
Ph. Houdy
Keyword(s):  
High Vacuum ◽  
Rf Sputtering ◽  
Ultra High Vacuum ◽  
Silicon Substrates ◽  
Ray Optics ◽  
X Ray ◽  
Long Period ◽  
The Past ◽  
X Ray Scattering ◽  
Short Period

Multilayers fabricated with alternating materials having significant differences in X-ray scattering powers are being investigated for applications in soft X-ray optics. Multilayers consisting of combinations of W, Rh, Fe, Si3N4, SiO2 and Si, C, B4C have been studied in the past. Mg2Si based multilayer structures are theoretically efficient reflectors of wavelengths above the Mg-Kα line (9.89 Å) and the Mg-Lα line (251.5 Å) because of their low absorption in the respective wavelength regimes due to the presence of magnesium. In the present study, Mg2Si based multilayers fabricated on silicon substrates by ultra high vacuum rf sputtering have been characterized by HREM. W, Si, and Mg2Si targets in conjunction with the introduction of nitrogen were employed to deposit alternate Mg2Si and W or Si3N4 layers. We report here our preliminary observations of a characteristic short period W/Mg2Si layered structure used above the Mg-Kα line and two long period multilayers based on W/Mg2Si and Si3N4/Mg2Si used above the Mg-Lα line.

scholarly journals Forecasting the Stock Price by using Holt’s Method

2019 ◽  
Vol 1 (1) ◽  
pp. 15
Author(s):  
Omar Sharif ◽  
Md Zobaer Hasan
Keyword(s):  
Stock Price ◽  
Stock Exchange ◽  
Share Price ◽  
Long Period ◽  
Daily Data ◽  
Short Period ◽  
Closing Price ◽  
Long Time ◽  
Short Time ◽  
A Share

This study proposed to develop a stock indicator that can forecast the value of a share by considering the daily closing price or opening price with the different parameter of Holt’s method. Most of the indicator which is existing in most of the stock market which forecasted value is based on a long period forecast. But, Holt’s method will be easy to analyze the price of an individual company with maximum accuracy for short period forecasting. The daily data, the closing price of the different company, are collected from the Dhaka Stock Exchange (DSE) for the period of 2016. The variables: level, trend, forecast as well as smoothing constant (α, β) are used for quick reaction to systematic changes in the time series. By using Holt’s method, a buyer can predict, how much of a share price will be the next day. The research finds that Holt’s method forecasting is better for short time then long time as evidence shows that the fourth day predicted value is closer to the actual value. In addition, the analysis discovers that for prediction the forecast value, the fifteen and seven days’ data of any company are more accurate than 30 days’ data. This study notices that different smoothing constant is the big factor for forecasting and suggests to use smoothing constant α = 0.5, β = 0.1.

The Evolutionary Significance of Recurrent Novae

1979 ◽  
Vol 46 ◽  
pp. 102-118 ◽  
Author(s):  
Ronald F. Webbink
Keyword(s):  
Binary Systems ◽  
Evolutionary Significance ◽  
Cataclysmic Variable ◽  
Theoretical Problem ◽  
Long Period ◽  
The Past ◽  
Initial Separation ◽  
Crude Model ◽  
Short Period ◽  
Early Phases

Within the past few years, it has become increasingly apparent that common novae and dwarf novae must owe their origin to binary systems of much larger initial separation than they now have (Paczynski 1976; Ritter 1975, 1976; Webbink 1975). This was demanded by the realization that the white dwarfs in these binaries are generally quite massive (see for instance Warner 1973; Robinson 1976). At the same time, the earlier association of these binaries with W Ursae Majoris-type progenitors could no longer be supported (Webbink 1976b).It was clear even from the first suggestion of the long-period progenitor hypothesis that, although there certainly exist processes which drain mass and angular momentum from a binary efficiently enough to produce a short period cataclysmic variable (CV, for brevity), and to which a long period binary is in all likelihood extremely vulnerable, the details of this transformation present a theoretical problem of formidable difficulty. Nevertheless, some progress on this problem is now being made: a crude model of the early phases of mass exchange is discussed below, and models relevant to later phases have been computed by Meyer and Meyer-Hofmeister (1979; see also Taam et al. 1978).

scholarly journals 27. Commission des Étoiles Variables

1936 ◽  
Vol 5 ◽  
pp. 168-172
Author(s):  
M. A. A. Nijland ◽  
M. R. S. Dugan ◽  
MM. Banachiewicz ◽  
A. Bemporad ◽  
Blažko ◽  
...  
Keyword(s):  
Variable Star ◽  
Statistical Data ◽  
Variable Stars ◽  
Eclipsing Binaries ◽  
Short Report ◽  
Long Period ◽  
The Past ◽  
Short Period ◽  
Adequate Idea ◽  
Period Variable

It is well-nigh impossible to give, in a short report, an adequate idea of the enormous activity in Variable-Star Astronomy during the past three years. Without attempting to be complete I shall give a summary of the most important recent occurrences in this field of research.Statistical data for eclipsing binaries were given by Gaposchkin (Veröff. Berlin-Bab. 9, Heft 5), for long-period variable stars by Ludendorff (Sitz.-ber. Ak. d. Wiss. Berlin, 1932), Thomas (Veröff. Berlin-Bab. 9, Heft 4) and Sterne and L. Campbell (Harvard Annals).Some valuable catalogues have been issued: a Finding List for Observers of Eclipsing Variables by Dugan (Princeton Contr. No. 15), a Catalogue of Eclipsing Variables, together with a Program of Investigations, by Martinoff (Engelhardt Obs. Bull. No. 2), a Catalogue and Ephemeris of Short-period Cepheids by Zessewitsch (Len. Un. A. 0. Bull. No. 3).

Source Parameters of Large Australian Intracontinental Earthquakes

1988 ◽  
Vol 59 (4) ◽  
pp. 315-315
Author(s):  
Robert McCaffrey ◽  
Joanne Fredrich
Keyword(s):  
Continental Margin ◽  
Source Parameters ◽  
Strike Slip ◽  
Thrust Faulting ◽  
Long Period ◽  
The Past ◽  
Preliminary Examination ◽  
Short Period ◽  
Australian Continent ◽  
Large Earthquakes

Abstract We have examined the largest earthquakes in the Australian continent over the past 20 years by modeling their teleseismic long-period P and SH and short-period P waveforms. Eight earthquakes beneath the continent show thrust faulting at depths shallower than 10 km. Three (1, 2, 4 below) produced surface faulting and their waveforms indicate centroid depths of 3 km or less. The P-axes in the southwestern half of the continent have easterly trends. Preliminary examination of the 3 large earthquakes near Tennant Creek on 22 January, 1988, (7–9) indicate thrusting at less than 10 km depth, but with N-trending P-axes. The largest event (9), at 12:06 GMT, had a seismic moment of roughly 1019 Nm, which makes it comparable in size to the 1968 Meckering event (1). One event (6) beneath the continental margin indicates strike-slip at 26 km depth.

The Origin of the Moon and its Relationship to the Origin of the Solar System

1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey
Keyword(s):  
Solar System ◽  
The Moon ◽  
The Past ◽  
The Earth ◽  
Short Period ◽  
Origin Of The Moon

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.

Discussion following the presentation by F. Deubner

1977 ◽  
Vol 36 ◽  
pp. 69-74
Keyword(s):  
List Type ◽  
The Sun ◽  
Type Number ◽  
Harmonic Motion ◽  
Locally Excited ◽  
Long Period ◽  
Coherent Wave ◽  
Short Period ◽  
Global Modes

The discussion was separated into 3 different topics according to the separation made by the reviewer between the different periods of waves observed in the sun :1) global modes (long period oscillations) with predominantly radial harmonic motion.2) modes with large coherent - wave systems but not necessarily global excitation (300 s oscillation).3) locally excited - short period waves.

World Economy: Prospects and Barriers for Recovery

2012 ◽  
pp. 61-83 ◽  
Author(s):  
M. Ershov
Keyword(s):  
World Economy ◽  
Western World ◽  
Short Time Period ◽  
Market Segments ◽  
Junk Bonds ◽  
The Past ◽  
Time Period ◽  
The Us ◽  
Global Liquidity ◽  
Short Time

According to the latest forecasts, it will take 10 years for the world economy to get back to “decent shape”. Some more critical estimates suggest that the whole western world will have a “colossal mess” within the next 5–10 years. Regulators of some major countries significantly and over a short time‑period changed their forecasts for the worse which means that uncertainty in the outlook for the future persists. Indeed, the intensive anti‑crisis measures have reduced the severity of the past problems, however the problems themselves have not disappeared. Moreover, some of them have become more intense — the eurocrisis, excessive debts, global liquidity glut against the backdrop of its deficit in some of market segments. As was the case prior to the crisis, derivatives and high‑risk operations with “junk” bonds grow; budget problems — “fiscal cliff” in the US — and other problems worsen. All of the above forces the regulators to take unprecedented (in their scope and nature) steps. Will they be able to tackle the problems which emerge?

scholarly journals Contributions of Hypoxia-Awareness Training to the Familiarization of Personal Symptoms for Occupational Safety in the Flight Environment

2021 ◽  
Vol 18 (6) ◽  
pp. 2904
Author(s):  
Kwo-Tsao Chiang ◽  
Min-Yu Tu ◽  
Chao-Chien Cheng ◽  
Hsin-Hui Chen ◽  
Wun-Wei Huang ◽  
...  
Keyword(s):  
Occupational Safety ◽  
Safety Issue ◽  
Hot Flashes ◽  
Occurrence Rate ◽  
Flight Safety ◽  
Awareness Training ◽  
The Past ◽  
Individual Memory ◽  
The Individual ◽  
Poor Concentration

Hypoxia remains a flight-safety issue in terms of aviation medicine. Hypoxia-awareness training has been used to help aircrew members recognize personal hypoxia symptoms. There is still no study, as yet, to establish the association of within-subject data between inflight hypoxia events and the altitude chamber. The main purpose of our study was to use paired subjects’ data on inflight hypoxia symptoms compared with those experienced during training. A questionnaire was developed to obtain information on military aircrew members in 2018. Among 341 subjects, 46 (13.49%) suffered from inflight hypoxia. The majority of the subjects detected ongoing inflight hypoxia on the basis of their previous experience with personal hypoxia symptoms or sensations in previous chamber flights. Of the top five hypoxia symptoms, the data revealed that hot flashes, poor concentration, and impaired cognitive function appeared both during the inflight events and during the hypoxia-awareness training. The occurrence rate of hypoxia symptoms was found to not be significantly different between the in-flight events and the past chamber flights through an analysis of within-subject data. Because the individual memory had faded away over time, fresher hypoxia awareness training is still mandatory and valuable to recall personal hypoxia experience for military aircrew members.

scholarly journals Isolation and Analysis of Six timeless Alleles That Cause Short- or Long-Period Circadian Rhythms in Drosophila

Genetics ◽  
2000 ◽  
Vol 156 (2) ◽  
pp. 665-675
Author(s):  
Adrian Rothenfluh ◽  
Marla Abodeely ◽  
Jeffrey L Price ◽  
Michael W Young
Keyword(s):  
Nuclear Translocation ◽  
Phase Response Curve ◽  
Fixed Number ◽  
Constant Darkness ◽  
Genetic Screens ◽  
Protein Levels ◽  
Long Period ◽  
Short Period ◽  
Molecular Oscillation ◽  
New Alleles

Abstract In genetic screens for Drosophila mutations affecting circadian locomotion rhythms, we have isolated six new alleles of the timeless (tim) gene. Two of these mutations cause short-period rhythms of 21–22 hr in constant darkness, and four result in long-period cycles of 26–28 hr. All alleles are semidominant. Studies of the genetic interactions of some of the tim alleles with period-altering period (per) mutations indicate that these interactions are close to multiplicative; a given allele changes the period length of the genetic background by a fixed percentage, rather than by a fixed number of hours. The timL1 allele was studied in molecular detail. The long behavioral period of timL1 is reflected in a lengthened molecular oscillation of per and tim RNA and protein levels. The lengthened period is partly caused by delayed nuclear translocation of TIML1 protein, shown directly by immunocytochemistry and indirectly by an analysis of the phase response curve of timL1 flies.

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