Fluctuations

2018 ◽  
Author(s):  
Richard Wigmans
Keyword(s):  
Energy Dependence ◽  
Energy Resolution ◽  
Practical Importance ◽  
Shower Particle ◽  
Formation Processes ◽  
Instrumental Effects ◽  
Important Type ◽  
High Energies ◽  
Different Types ◽  
Electromagnetic Component

The energy resolution, i.e. the precision with which the energy of a showering particle can be measured, is one of the most important characteristics of a calorimeter. This resolution is determined by fluctuations in the absorption and signal formation processes. In this chapter, the different types of fluctuations that may play a role are examined, and their relative practical importance is addressed. Sources of fluctuations include fluctuations in the number of signal quanta, sampling fluctuations, fluctuations in shower leakage, as well as a variety of instrumental effects. Since the energy dependence of the different types of fluctuations is not the same, different types of fluctuations may dominate the energy resolution at low and and at high energies. An important type of fluctuations is part of the non-compensation phenomena. It concerns fluctuations in the strength of the electromagnetic component of hadronic showers. The effects of these fluctuations, which typically dominate the energy resolution for hadron and jet detection, are examined in detail. In sampling calorimeters, one particular shower particle may sometimes have catastrophic effects on the calorimeter performance. Several examples of such cases are discussed.

The Physics of Shower Development

2018 ◽  
Author(s):  
Richard Wigmans
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Energy Dependence ◽  
Development Process ◽  
Practical Importance ◽  
Dense Matter ◽  
Nuclear Interaction ◽  
Electromagnetic Showers ◽  
Different Types ◽  
Shower Development

The processes that play a role in the absorption of different types of particles in dense matter are described, with emphasis on the aspects that are important for calorimetry. A distinction is made between particles that develop electromagnetic showers (electrons, photons) and particles that are subject to the strong nuclear interaction, such as pions and protons. A separate section is dedicated to muons, which are typically not fully absorbed in practical calorimeters. The energy dependence of the various processes, and the consequences for the size requirements of detectors, are discussed in detail. The practical importance and limitations of Monte Carlo simulations of the shower development process are reviewed. The chapter ends with a summary of facts deriving from the physics of shower development that are important for calorimetry.

Energy dependence of hadron yields in pp and AA collisions

2015 ◽  
Vol 39 ◽  
pp. 1560109
Author(s):  
D. A. Artemenkov ◽  
G. I. Lykasov ◽  
A. I. Malakhov
Keyword(s):  
Energy Dependence ◽  
Hadron Production ◽  
Exponential Form ◽  
Suggested Approach ◽  
High Energies ◽  
Aa Collisions

To describe the data on hadron production at high energies in the midarapidity region and not large transverse momenta [Formula: see text], we modify the simple exponential form of the [Formula: see text]-spectrum. The hadron [Formula: see text]-spectrum is presented in two parts due to the contributions of quarks and gluons, each of them has different energy dependence. The suggested approach alows us to describe rather satisfactorily the inclusive spectra of hadrons produced in [Formula: see text] collisions at energies from the AGS up to LHC.

scholarly journals What 100 Years of Typing Research Can Tell Us

2019 ◽  
Author(s):  
Motonori Yamaguchi
Keyword(s):  
20Th Century ◽  
Practical Importance ◽  
Computer Interface ◽  
Current Status ◽  
Early 20Th Century ◽  
Dominant Form ◽  
Complex Skills ◽  
Different Types ◽  
The Common ◽  
The Right

The need of typewriting skill is ever increasing in our lives. The prevalence of personal computers and mobile devices has transformed the way people communicate with each other. Although many different types of human interfaces have been introduced over the decades, the dominant form of computer interface remains to be that of typing on a keyboard. [...] Whilst typing has become one of the common everyday skills within the last two decades, experimental psychologists have been studying it as a research subject for more than a hundred years. [...] Apart from its practical importance in the modern lifestyle, the act of typing involves the right amount of complexity as well as well-defined and measurable actions. These features of typewriting makes it an ideal testbed to gain our understanding of the control and acquisition of complex skills. This review article first presents a brief overview of the classic studies of typewriting skill in the early 20th century, discusses the developments that took place after the mid-20th century, and concludes with the current status and issues that remain for future investigations in the 21st century.

Is it possible to determine formation processes of organic deposits through polysaccharides? Pilot study from the prehistoric site in Brandýs nad Labem, Czech Republic

The Holocene ◽  
2017 ◽  
Vol 27 (9) ◽  
pp. 1273-1280
Author(s):  
Klement Rejšek ◽  
Jan Turek ◽  
Valerie Vranová ◽  
Roman Hadacz ◽  
Lenka Lisá
Keyword(s):  
Czech Republic ◽  
Pilot Study ◽  
Organic Material ◽  
Archaeological Site ◽  
Soil Samples ◽  
Formation Processes ◽  
Cultural Layer ◽  
Different Types ◽  
Organic Deposits

This paper deals with a possible interpretation value of biochemical methods in comparison with the classic tools of geoarchaeology for the evaluation of formation processes. Organic rich layers from the archaeological site Brandýs nad Labem-Vrábí were tested with the aim to determine the origin of several different types of soil organic material by analyzing the content of different sugars. The studied soil body showed signs of cultural layer, redeposited soils, and in situ developed soil. The analysis of different sugars was highlighted: soil samples taken from these layers were analyzed to assess the ratios of mannose + galactose to arabinose + xylose, and of rhamnose + fucose to arabinose + xylose, content of Corg and different nitrates, as well as different rates of absorbance. The results show that the interpretation values of polysaccharides evaluation didn’t bring significant results itself, but in combination with classical tools of geoarchaeology may bring interpretable and new results.

Appositive compounds in dialectal and sociolinguistic varieties of French

2020 ◽  
pp. 326-346
Author(s):  
Brigitte L. M. Bauer
Keyword(s):  
Twentieth Century ◽  
Data Analysis ◽  
Geographic Variation ◽  
Word Order ◽  
Word Formation ◽  
Underlying Structure ◽  
Formation Processes ◽  
Early Twentieth Century ◽  
Different Types

Over the last 100 years, appositive compounding—combining two nouns in apposition—has become one of the most productive word formation processes in French. In an attempt to account for this dramatic spread and building on existing diachronic research, this article examines the occurrence of appositive compounds in non-standard French during the twentieth century, in a number of Gallo-Romance dialects and in Poilu, a sociolect from the early twentieth century, bringing together historical, dialectal, and sociolinguistic data. Analysis includes the identification of the different types of appositive compound and their underlying structure. Moreover word order patterns and their potential geographic correlates will be investigated as well as the role of metaphors and metonymy. Data reflecting geographic variation and sociolinguistic stratification will thus help to determine what factors were at play in the expansion of appositive compounding in contemporary French.

The dissociation of fast H 2 + ions by hydrogen

1960 ◽  
Vol 256 (1286) ◽  
pp. 416-426 ◽  
Keyword(s):  
Triplet State ◽  
Energy Dependence ◽  
Cross Sections ◽  
Large Fraction ◽  
Exchange Process ◽  
Hydrogen Gas ◽  
High Energies ◽  
Scintillation Crystals ◽  
The Cross ◽  
Simple Dissociation

H 2 + ions of energy 100 to 800 keV have been passed through hydrogen gas and the cross-sections for the following four processes determined : (1) H 2 + → H + + H O , (2) H 2 + → H + + H + , (3) H 2 + → H O + H O , (4) H 2 + → H 2 O . A magnetic field was used to separate the fast dissociation products of different e / m , and CsI(Tl) scintillation crystals were used as detectors. Double-height pulses resulted when two particles of the same e / m , simultaneously entered one of the crystals and were clearly resolved from single pulses. Processes (3) and (4) were separated by moving a fine slit across the neutral-particle counter which thus counted only H 2 O particles as double pulses. The partial cross-sections for processes (1) and (2) show an E -1 dependence at high energies. The energy dependence is less marked below 300 keV, where the Born approximation might be expected to be invalid. The partial cross-sections for processes (3) and (4) show the strong energy dependence characteristic of an electron-exchange process. The angular distribution for process (3) is consistent with the reaction proceeding via the 1 3 Ʃ u repulsive triplet state. The large fraction of the capture reactions proceeding this way (70%), is reasonable considering the high probability of formation in the triplet state. The large values of the cross-sections for processes other than simple dissociation account, in part, for the considerable discrepancies between the results of other workers.

scholarly journals Influence of network organizational structures on innovation activity of industrial enterprises

2018 ◽  
Vol 16 (3) ◽  
pp. 174-188 ◽  
Author(s):  
Olena Palyvoda ◽  
Oksana Karpenko ◽  
Olena Bondarenko ◽  
Svitlana Bonyar ◽  
Andrea Bikfalvi
Keyword(s):  
Practical Importance ◽  
High Strength ◽  
Innovation Activity ◽  
Light Industry ◽  
Foreign Partner ◽  
Network Cooperation ◽  
Eu Countries ◽  
Industrial Enterprises ◽  
Different Types ◽  
The Eu

The interrelation between the innovation activity of enterprises and various types of network cooperation is of practical importance for the effective strategic management of network structures. In the present study, on the basis of indicators that measure innovation and technological effects and are adapted to the standards of statistics of the EU countries, the weighted aggregate innovation index of light industry companies in Ukraine and the EU countries is justified and calculated. On the basis of correlation and regression analysis, the relationships of varying strength are established between the integrated innovation index and different types of network innovative cooperation of light industry companies of the EU countries. The high-strength relationship is revealed between the innovation index of light industry and the indicators of the share of companies that had partners within their group of companies; that were involved in any type of network innovation partnership; that had partners in innovative cooperation among universities; that were involved in any type of partnership with a foreign partner from the EU countries, the EFTA countries or the candidate countries for accession to the EU. The construction of a correlation-regression model of the dependence of the innovation index of light industry on the share of innovation-active companies involved in any type of network innovation partnership and the share of innovation-active companies involved in network cooperation with a foreign partner from the EU countries, the EFTA countries or the candidate countries for accession to the EU given the possibility to predict the level of innovation of domestic companies of light industry depending on the level of their involvement in different types of network innovative cooperation.

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