Computer simulation of glass formation from simple model liquids

1980 ◽  
Vol 69 ◽  
pp. 273 ◽  
Author(s):  
Julian H. R. Clarke ◽  
John F. Maguire ◽  
Leslie V. Woodcock
Keyword(s):  
Computer Simulation ◽  
Simple Model ◽  
Glass Formation

scholarly journals Effect of Stage Volume Ratio on Audience Acoustics in Concert Halls

2020 ◽  
Vol 12 (4) ◽  
pp. 1370 ◽  
Author(s):  
Jin Yong Jeon ◽  
Rosa Seo ◽  
Hyun In Jo
Keyword(s):  
Computer Simulation ◽  
Simple Model ◽  
Volume Ratio ◽  
Acoustic Parameter ◽  
Acoustic Parameters ◽  
Design Factor ◽  
Acoustic Design ◽  
Critical Design ◽  
Study Results ◽  
Concert Halls

This report proposes the stage volume ratio (Vo/V) as an acoustic design factor for concert halls and presents an investigation of the dependence of the acoustic parameters of an auditorium on the stage volume through computer simulation. Firstly, the ratio of the stage volume to the total volume of a concert hall was defined as Vo/V through case studies of existing concert halls. It was verified using a simple model that the stage acoustic parameter STEarly and audience acoustic parameters G and C80 decreased, whereas, the reverberation time and early decay time increased with increasing Vo/V. Secondly, a computer simulation was performed for nine existing concert halls, while changing Vo/V from −20% to 30%. The room acoustic parameters exhibited the same patterns as suggested by the simple model. Vo/V significantly affected the bass ratio and bass index. A comparison of the effects of Vo/V and the sound absorption coefficient in nine concert halls revealed that Vo/V contributed approximately 15% to the reverberation and affected the bass characteristics more substantially. Thus, Vo/V is a critical design factor when determining the warmth of the audience acoustics. The study results could be used as a basis for acoustic design in the future.

A computer simulation for a simple model of liquid hydrogen chloride

1979 ◽  
Vol 38 (3) ◽  
pp. 893-908 ◽  
Author(s):  
J.G. Powles ◽  
W.A.B. Evans ◽  
E. McGrath ◽  
K.E. Gubbins ◽  
S. Murad
Keyword(s):  
Computer Simulation ◽  
Simple Model ◽  
Hydrogen Chloride ◽  
Liquid Hydrogen

A Crystallographic Guide to the Structure of Borate Glasses

1996 ◽  
Vol 455 ◽  
Author(s):  
Adrian C. Wright ◽  
Natalia M. Vedishcheva ◽  
Boris A. Shakhmatkin
Keyword(s):  
Simple Model ◽  
Glass Formation ◽  
Degrees Of Freedom ◽  
Borate Glasses ◽  
Structural Units ◽  
Torsion Angles ◽  
Insight Into ◽  
Internal Degrees Of Freedom ◽  
Considerable Insight

ABSTRACTBorate glasses are an enigma in that there is now increasing evidence that their structures are dominated by superstructural units, which comprise well defined arrangements of the basic BO3 and BO4 structural units, with no internal degrees of freedom in the form of variable bond or torsion angles. In the present paper, it is shown that considerable insight into the structure of borate glasses can be gained from a study of the corresponding crystalline polymorphs. A simple, model is proposed to predict the fraction, x4, of 4-fold co-ordinated boron atoms in vitreous borate networks and the topological criteria for the formation of such networks are discussed, taking into account the degrees of freedom necessary for conventional glass formation.

scholarly journals Knock-knock, who’s there: Sex-coding, competition and the energetics of tapping communication in the tok-tok beetle, Psammodes striatus (Coleoptera: Tenebrionidae)

2019 ◽  
Author(s):  
John R.B. Lighton
Keyword(s):  
Computer Simulation ◽  
Simple Model ◽  
Communication System ◽  
Computer Assisted ◽  
Tenebrionid Beetle ◽  
Timing Data ◽  
Response Timing ◽  
Solitary Female ◽  
Coleoptera Tenebrionidae

ABSTRACTI describe the abdomino-substratal tapping communication system of a Southern African tenebrionid beetle, Psammodes striatus (Fabricius, 1775) (Coleoptera: Tenebrionidae: Molurini), using computer simulation of tapping signals and computer-assisted acquisition of precise response timing data, augmented with data from natural beetle-beetle communication. Communication consists of trains of 5 - 7 Hz taps in groups or trains separated by 2-3 sec intervals. Male beetles spontaneously produce groups of tap-trains with 8 - 18 taps per train. If other beetles reply, an alternating duet commences. Solitary female beetles do not tap spontaneously but respond to male tapping with short, distinctive tap-trains containing 4 – 6 taps; they ignore female signals. In contrast, extensive communication occurs between male beetles, the nature of which changes significantly if the stimulus call is typical of male or of female beetles. Inter-male communication consists of long tap-trains, but males interacting with females produce shorter tap-trains and engage in phonotactic behavior that is absent in inter-male communication. Females respond highly preferentially to inter-male communication, rather than to the signals produced spontaneously by single males. Finally, I propose a simple model of the selective advantages of this unusual communication system, and calculate its approximate energetic leverage over random locomotion (∼13x).

scholarly journals A computer simulation of language families

2008 ◽  
Vol 44 (3) ◽  
pp. 659-675 ◽  
Author(s):  
PAULO MURILO CASTRO DE OLIVEIRA ◽  
DIETRICH STAUFFER ◽  
SØREN WICHMANN ◽  
SUZANA MOSS DE OLIVEIRA
Keyword(s):  
Computer Simulation ◽  
Simple Model ◽  
Computer Simulations ◽  
Structural Features ◽  
Development Of Language

This paper presents computer simulations of language populations and the development of language families, showing how a simple model can lead to distributions similar to those observed empirically by Wichmann (2005) and others. The model combines features of two models used in earlier work for the simulation of competition among languages: the ‘Viviane’ model for the migration of peoples and the propagation of languages, and the ‘Schulze’ model, which uses bit-strings as a way of characterising structural features of languages.

scholarly journals A simple model of ion beam heated ICF targets

1983 ◽  
Vol 1 (3) ◽  
pp. 231-239 ◽  
Author(s):  
R. G. Evans
Keyword(s):  
Computer Simulation ◽  
Charged Particle ◽  
Simple Model ◽  
Ion Beam ◽  
Laser Beams ◽  
Particle Beams ◽  
Charged Particle Beams ◽  
Hydrodynamic Behaviour ◽  
Temperature And Pressure ◽  
Good Agreement

A simple model is presented for the thermodynamic and hydrodynamic behaviour of solid targets heated by intense charged particle beams. The model gives the temperature and pressure generated by the beam and allows a direct comparison with the pressure generated by laser beams. The model is in good agreement with a coupled thermodynamic hydrodynamic computer simulation.

Anharmonic lattice dynamics and computer simulation for simple model systems

1992 ◽  
Vol 45 (5) ◽  
pp. 2113-2125 ◽  
Author(s):  
Piero Procacci ◽  
Gianni Cardini ◽  
Roberto Righini ◽  
Salvatore Califano
Keyword(s):  
Computer Simulation ◽  
Simple Model ◽  
Lattice Dynamics ◽  
Model Systems ◽  
Anharmonic Lattice
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