The History of Cherenkov Detectors

2016 ◽  
pp. 336-345
Keyword(s):  
Refractive Index ◽  
Particle Physics ◽  
Electron Velocity ◽  
Cherenkov Detectors ◽  
Additional Work ◽  
Different Types ◽  
History Of

As early as 1937 Pavel Alexejevitj Cherenkov wrote in one of his papers (Cherenkov, 1937), “...it is possible to pose the problem: for a given electron velocity find a liquid with such a refractive index, that the effect begins to show up. After some additional work this variant of experiments can be used for determination of electron velocities.” Since then many different types of Cherenkov detectors have been successfully developed and used, without which particle physics would probably not have come as far as it has today.

Dhaagicw Life-Stages: A Study in Paradigmatic Reconstruction

1985 ◽  
Vol 12 ◽  
pp. 11-28
Author(s):  
Patrick R. Bennett
Keyword(s):  
Word Meaning ◽  
Vowel Quality ◽  
Developmental Sequence ◽  
Linguistic Research ◽  
Relative Chronology ◽  
Different Types ◽  
History Of ◽  
Case Markings ◽  
Important Form

Among the goals of diachronic linguistic research, we may recognize two types of what is commonly called “reconstruction.” One of these involves postulation of a “proto-unit,” such as vowel-quality assumed to underlie an observed correspondence set, or the probable original rule of relative-clause formation. The other involves the “reconstruction” of a system or paradigm. Examples are the postulation of an ancestral set of phonemic contrasts, or determination of the original pattern of case markings. Within each type, we may further distinguish between reconstruction of the probable situation at å given point in the history of the languages (as exemplified by most reconstructions of Proto-Bantu), and postulation of a sequence of stages and changes leading up to the present situation.The historian often has recourse to these reconstructions. If carefully used, they may be an important form of evidence in plumbing the history of the peoples speaking the languages concerned. Though such evidence should not, generally, be used alone, linguistically-based conclusions may validly add their weight to the evaluation of other data. As one might expect, the different types of linguistic reconstruction differ widely in utility to the historian. Reconstruction of the original shape of a word meaning ‘tree,’ for example, will help the historian but little, whereas reconstructing the developmental sequence of a grammatical system, with conclusions as to the nature and relative chronology of the linguistic separations and contacts involved, is likely to be more directly useful.

Effect of Glass Bead Refractive Index on Pavement Marking Retroreflectivity Considering Passenger Vehicle and Airplane Geometries

2020 ◽  
Vol 2674 (10) ◽  
pp. 438-447
Author(s):  
Adam M. Pike ◽  
Songjukta Datta
Keyword(s):  
Refractive Index ◽  
Glass Bead ◽  
Passenger Vehicle ◽  
Standard Measurement ◽  
Bead Size ◽  
Additional Work ◽  
Different Types ◽  
Measurement Geometry ◽  
Pavement Marking

Pavement marking retroreflectivity depends on several factors including but not limited to the type of retroreflective optics, binder, installation quality, marking condition, and measurement type/geometry. Texas A&M Transportation Institute (TTI) evaluated the retroreflectivity of 19 pavement marking panels, prepared with different types of glass bead at standard 30-m and non-standard measurement geometries. The non-standard geometries represented typical commercial airplane configurations. The primary purpose of the research was to evaluate the effects of the glass bead refractive index (RI) (1.5 versus 1.9) and the measurement geometry on pavement marking retroreflectivity. Results showed a decrease in retroreflectivity with an increase in observation and entrance angles for both 1.5 and 1.9 RI. The study showed higher retroreflectivity levels for high RI beads at all the geometries evaluated. The result showed that 1.9 RI beads exhibit an average of 171% (862 mcd/m2/lx) higher retroreflectivity at standard 30-m car geometry as well as 102% (193 mcd/m2/lx) higher retroreflectivity at airplane geometry compared with 1.5 RI beads. The study found that an increase in bead RI had a larger effect on retroreflectivity than did an increase in bead size. The effect of the measurement geometry on the retroreflectivity level of the markings highlights a limitation of using the 30-m car geometry to represent the visibility of markings from a pilot’s perspective. Additional work should be conducted to better assess the visibility of markings from various vehicle platforms and how to best represent the visibility through retroreflectivity measurement.

State-by-State Use of AMA Guides

2019 ◽  
Vol 24 (5) ◽  
pp. 3-7, 16
Keyword(s):  
Expert Testimony ◽  
Narrow Range ◽  
The United States ◽  
Workers Compensation ◽  
Federal Employees ◽  
Permanent Disability ◽  
Sixth Edition ◽  
History Of ◽  
Canadian Provinces

Abstract This article presents a history of the origins and development of the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), from the publication of an article titled “A Guide to the Evaluation of Permanent Impairment of the Extremities and Back” (1958) until a compendium of thirteen guides was published in book form in 1971. The most recent, sixth edition, appeared in 2008. Over time, the AMA Guides has been widely used by US states for workers’ compensation and also by the Federal Employees Compensation Act, the Longshore and Harbor Workers’ Compensation Act, as well as by Canadian provinces and other jurisdictions around the world. In the United States, almost twenty states have developed some form of their own impairment rating system, but some have a narrow range and scope and advise evaluators to consult the AMA Guides for a final determination of permanent disability. An evaluator's impairment evaluation report should clearly document the rater's review of prior medical and treatment records, clinical evaluation, analysis of the findings, and a discussion of how the final impairment rating was calculated. The resulting report is the rating physician's expert testimony to help adjudicate the claim. A table shows the edition of the AMA Guides used in each state and the enabling statute/code, with comments.

GENERAL CHARACTERISTIC OF TEA IN THE MARKETS OF TURKESTAN IN THE XIX-XX CENTURIES

2019 ◽  
Vol 16 (2) ◽  
pp. 55-60
Author(s):  
Maxfuza Mamatova ◽  
Keyword(s):  
General Characteristic ◽  
General Description ◽  
Different Types ◽  
History Of

This article deals with the general description of tea in the markets of Turkestan,provides an overview of the history of our country in the XIX-XX centuries, which based on archival materials and sources. This article tells about the types and varieties of tea consumed by our people, about the different types of tea that replace tea, where they were brought from, the meanings of their historical names and the consumption that was loved by our people.

Zum Einsatz von Definitionen in Pädagogik und Erziehungswissenschaft

2019 ◽  
Vol 95 (2) ◽  
pp. 145-161
Author(s):  
Thomas Mikhail
Keyword(s):  
Historical Research ◽  
Educational Science ◽  
Different Types ◽  
History Of ◽  
Academic Genre

Abstract On the Use of Definitions in Pedagogy and Educational Science. A Historical Journey with Systematic Intent In the academic genre of pedagogy and educational science, definitions were used from the very beginning. The question is if it is possible to differentiate between types of definitions within the history of these sciences. To answer this question the paper revives two different types of traditional definitions in order to generate a typology of definition usage. The typology can be used as a heuristic instrument for further systematic and historical research.

Characterization of Different Types of Biomass Wastes Using Thermogravimetric and ICP-MS Analyses

2020 ◽  
Vol 70 (12) ◽  
pp. 4594-4600
Keyword(s):  
Thermogravimetric Analysis ◽  
Food Industry ◽  
Wood Waste ◽  
Biomass Ash ◽  
Minor Elements ◽  
Ms Analysis ◽  
Icp Ms ◽  
Different Types

The purpose of this study was to characterize some types of biomass wastes resulted from different activities such as: agriculture, forestry and food industry using thermogravimetric and ICP-MS analyses. Also, it was optimized an ICP-MS method for the determination of As, Cd and Pb from biomass ash samples. The ICP-MS analysis revealed that the highest concentration of metals (As, Cd, Pb) was recorded in the wood waste ash sample, also the thermogravimetric analysis indicated that the highest amount of ash was obtained for the same sample (26.82%). The biomass wastes mentioned in this study are alternative recyclable materials, reusable as pellets and briquettes. Keywords: ash, biomass, ICP-MS, minor elements, TG

Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

2018 ◽  
Vol 69 (5) ◽  
pp. 1139-1144
Author(s):  
Iosif Lingvay ◽  
Adriana Mariana Bors ◽  
Livia Carmen Ungureanu ◽  
Valerica Stanoi ◽  
Traian Rus
Keyword(s):  
Structural Changes ◽  
Oxidation Processes ◽  
High Oleic ◽  
Painting Materials ◽  
Insulating Paper ◽  
Different Types ◽  
Mechanism And Kinetics ◽  
Kinetics Of ◽  
Natural Ester

For the purpose of using three different types of painting materials for the inner protection of the transformer vats, their behavior was studied under actual conditions of operation in the transformer (thermal stress in electro-insulating fluid based on the natural ester in contact with copper for electro-technical use and electro-insulating paper). By comparing determination of the content in furans products (HPLC technique) and gases formed (by gas-chromatography) in the electro-insulating fluid (natural ester with high oleic content) thermally aged at 130 �C to 1000 hours in closed glass vessels, it have been found that the presence the investigated painting materials lead to a change in the mechanism and kinetics of the thermo-oxidation processes. These changes are supported by oxygen dissolved in oil, what leads to decrease both to gases formation CO2, CO, H2, CH4, C2H4 and C2H6) and furans products (5-HMF, 2-FOL, 2 -FAL and 2-ACF). The painting materials investigated during the heat treatment applied did not suffer any remarkable structural changes affecting their functionality in the electro-insulating fluid based on vegetable esters.

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