On the Measurement of Atmospheric Extinction by Rufener’s Method

1979 ◽  
Vol 3 (5) ◽  
pp. 326-327
Author(s):  
Z. KviZ
Keyword(s):  
Adverse Effect ◽  
Photometric System ◽  
Photoelectric Photometry ◽  
Atmospheric Extinction ◽  
Air Mass

The coefficient of atmospheric extinction may change during the night and in fact it often does. This has an adverse effect on the determination of atmospheric extinction by simple Bouguer plot of magnitude against air mass. This effect was studied by Rufener (1964), who introduced for the purpose of accurate photoelectric photometry in the Geneva photometric system the method of two ‘extinction stars’. His method consists of the measurement of two stars of the same colour — one starting at high air mass 2 - 3, the M-star (for French montante = rising) and the second starting simultaneously in the meridian at low air mass, the D—star (for descending).

On zero-point drift in astronomical photoelectric photometry

1978 ◽  
Vol 3 (4) ◽  
pp. 275-278
Author(s):  
Z. Kviz
Keyword(s):  
Variable Star ◽  
Zero Point ◽  
Photometric System ◽  
Photoelectric Photometry ◽  
Air Mass ◽  
Comparison Stars

In variable star work, the frequent observations of comparison stars during a night often clearly indicate the presence of either changes in extinction or changes of zero point of the photometric system, or both effects simultaneously. In a magnitude — air mass plot, the graph is not linear, but is usually a loop. These loops are well known to observers but so far very little has been published about this problem. Young’s (1974) chapters are perhaps the only exception.

Statistical issues on the determination of the no-observed-adverse-effect levels in toxicology

2001 ◽  
Vol 12 (4) ◽  
pp. 319-325 ◽  
Author(s):  
Takashi Yanagawa ◽  
Yasuki Kikuchi
Keyword(s):  
Adverse Effect ◽  
Statistical Issues

Temperature Effect in Zero-Point Drift

1981 ◽  
Vol 4 (2) ◽  
pp. 260-262
Author(s):  
Z. Kviz
Keyword(s):  
Temperature Effect ◽  
Zero Point ◽  
Temperature Drift ◽  
Pulse Counting ◽  
Atmospheric Extinction ◽  
Air Mass ◽  
The Relationship

The relationship between the observed magnitude of a star and the air-mass takes the shape of a loop. These loops are caused by the zero-point drift of the photometer in use and by the variations of the atmospheric extinction taking place during the observation (Kviz 1979). From observations where the temperature drift of the photometer and of the photomultiplier were recorded, it is evident that the sense of the loops is correlated with the physical temperature of the photo-multiplier. Measurements have been made with the Swiss telescope and the 7-colour Geneva photometer P 7 using pulse counting with PM tube EMI9798 — described in Burnet (1976) and Burnet, Rufener (1979) — at La Silla, Chile.

Calibration of the Strömvil Photometric System

2003 ◽  
Vol 12 (4) ◽  
Author(s):  
A. Kazlauskas ◽  
V. Straižys ◽  
R. P. Boyle ◽  
A. G. Davis Philip ◽  
V. Laugalys ◽  
...  
Keyword(s):  
Physical Parameters ◽  
Photometric System ◽  
Photoelectric Photometry ◽  
Color Indices ◽  
Effective Temperatures

AbstractA calibration of color indices of the Strömvil photometric system in terms of physical parameters of stars is presented. The calibration is based on photoelectric photometry of about 1000 stars with known effective temperatures, distances, gravities and metallicities. The observations were accomplished in 2000-2003 with the 1.5 meter telescope of the Steward Observatory. The distances were taken from the Hipparcos catalog, and T

scholarly journals Is It Adverse, Nonadverse, Adaptive, or Artifact?

2016 ◽  
Vol 45 (1) ◽  
pp. 238-247 ◽  
Author(s):  
Arun R. Pandiri ◽  
Roy L. Kerlin ◽  
Peter C. Mann ◽  
Nancy E. Everds ◽  
Alok K. Sharma ◽  
...  
Keyword(s):  
Adverse Effect ◽  
Decision Making ◽  
Continuing Education ◽  
Adaptive Response ◽  
Clinical Pathology ◽  
Regulatory Agencies ◽  
Decision Making Process ◽  
Preclinical Studies ◽  
Quality Study

One of the principal challenges facing a toxicologic pathologist is to determine and differentiate a true adverse effect from a nonadverse or an adaptive response. Recent publications from the Society of Toxicologic Pathology (STP) and the European STP provide guidance for determining and communicating adversity in nonclinical toxicology studies. In order to provide a forum to inform and engage in a discussion on this important topic, a continuing education (CE) course was held during the 2016 STP Annual meeting in San Diego, CA. The lectures at this course provided guidance on determining and communicating adversity using case studies involving both clinical pathology and anatomic pathology. In addition, one talk also focused on data quality, study design, and interpretation of artifacts that could hinder the determination of adversity. The CE course ended with a talk on understanding adversity in preclinical studies and engaging the regulatory agencies in the decision-making process. This manuscript is designed to provide brief summaries of all the talks in this well-received CE course.

scholarly journals Kharkiv study of near-Earth asteroids

2006 ◽  
Vol 2 (S236) ◽  
pp. 385-390 ◽  
Author(s):  
Yu. N. Krugly ◽  
N. M. Gaftonyuk ◽  
I. N. Belskaya ◽  
V. G. Chiorny ◽  
V. G. Shevchenko ◽  
...  
Keyword(s):  
Surface Properties ◽  
Crimean Astrophysical Observatory ◽  
Photometric System ◽  
Rotation Periods ◽  
Photometric Observations ◽  
National University ◽  
Ccd Observations ◽  
Asteroid Hazard ◽  
Near Earth Asteroids

AbstractThe regular CCD observations of near-Earth asteroids (NEAs) in the Institute of Astronomy of Kharkiv National University were initiated in 1995 within the framework of asteroid hazard problem in collaboration with the DLR, Institute of Planetary Research (Berlin). The main aim of the study is a determination of rotation periods and shapes of NEAs as well as astrometry of newly discovered objects. We also carry out the absolute photometry of NEAs in BVRI bands in order to put constraints on surface properties and to estimate their diameters. The observations are carried out with 0.7-m telescope of the Institute of Astronomy (Kharkiv) and with 1-m telescope of the Crimean Astrophysical Observatory (Simeiz) in the standard Johnson-Cousins photometric system. Some observations were made as an optical support of radar observation of NEAs. We present the results of photometric observations of 21 NEAs obtained in 2004-2006 which include asteroid rotation properties, diameters and shapes.

scholarly journals Utilization of Ozone for the Improvement of Mentha piperita L. Quality by Reduction of Microbial Load and Impact of the Process on the Herb Properties

2020 ◽  
Vol 24 (2) ◽  
pp. 156-164
Author(s):  
Piotr Antos ◽  
Tomasz Piechowiak ◽  
Krzysztof Tereszkiewicz ◽  
Maciej Balawejder
Keyword(s):  
Adverse Effect ◽  
Essential Oils ◽  
Sensory Evaluation ◽  
Microbial Contamination ◽  
Food Poisoning ◽  
Microbial Load ◽  
Mentha Piperita

AbstractHerbs can be contaminated with microorganisms, which affects their quality while increasing the risk of food poisoning. Thus, there is a need for efficient decontamination techniques. In this study, the microbial load was reduced in peppermint herb (Mentha piperita L.) exposed to ozone at 10 ppm for 60 minutes. The quality of the ozonated herb was assessed by the determination of microbial load and essential oils content. Total microbial content was reduced by 4 log cfu g−1 of the microorganisms whereas the contamination with molds was reduced from 10.07 log cfu g−1 of the microorganisms to zero. Moreover, sensory evaluation of the herb aroma was conducted. These characteristics were not significantly affected by the treatment. Therefore, ozone can be used to improve the peppermint herb quality by reduction of the microbial contamination of peppermint herb while having no adverse effect on the herb aroma.

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