scholarly journals Nurse T. with Sheard, T. (2020) A Pandemic Nurse’s Diary. Hard Ball Press

2021 ◽  
pp. 160-161
Author(s):  
Jeanne Bryner
Keyword(s):  
Hard Ball

Hard Ball Systems and the Lorentz Gas

2000 ◽  
Author(s):  
L. A. Bunimovich ◽  
D. Burago ◽  
N. Chernov ◽  
E. G. D. Cohen ◽  
C. P. Dettmann ◽  
...  
Keyword(s):  
Lorentz Gas ◽  
Hard Ball

scholarly journals Vertical air motions derived from a descending radiosonde using a lightweight hard ball as the parachute

2013 ◽  
Vol 6 (5) ◽  
pp. 8107-8127 ◽  
Author(s):  
H. Chen ◽  
Y. Zhu ◽  
J. Zhang ◽  
Y. Xuan
Keyword(s):  
Northern China ◽  
Lower Atmosphere ◽  
Radiosonde Data ◽  
Small Magnitude ◽  
Abstract Knowledge ◽  
Launch Site ◽  
Wind Profiler Radar ◽  
Vertical Wind Speed ◽  
The Difference ◽  
Hard Ball

Abstract. Knowledge of vertical air motions in the atmosphere is important for meteorological and climate studies due to its impact on clouds, precipitation and the vertical transport of air masses, heat, momentum, and composition. It is among the most difficult quantities to measure because of its small magnitude. In this study, a descending radiosonde technique has been developed to detect the vertical wind speed (VW) in the atmosphere. The system is composed of a radiosonde and a 0.5-m diameter hard ball made of plastic foam that acts as a parachute. The radiosonde hangs under the hard ball by a string which is then cut when the instrument is elevated into the upper troposphere by a balloon. The VW is derived from the difference between the observed radiosonde descent rate and the calculated radiosonde descent rate in still air based on fluid dynamics. Deduction of the appropriate drag coefficient for the radiosonde is facilitated by the symmetrical shape of the parachute. An intensive radiosonde launch experiment was held in northern China during the summer seasons of 2010 to 2012. This study uses radiosonde data collected during the campaign to retrieve the vertical air velocity within the radiosonde altitude-detecting range. In general, the VW ranges from −1 to 1 m s−1. Strong vertical air motion (~2 m s−1) is seen in a few radiosonde measurements. Although considerable uncertainties exist in measuring weak vertical air motions, a case study shows that there is reasonable agreement between retrievals of VW in the lower atmosphere from the radiosonde and a wind profiler radar located at the launch site.

scholarly journals A similarity score of protein three dimensional structures by hard ball model using a genetic algorithm (2): Overlapping of helix and sheet portions

2002 ◽  
Vol 3 ◽  
pp. 117-123
Author(s):  
Shin-ichi Nakayama ◽  
Eiichiro Mitsusada ◽  
Peter Willett ◽  
Masayuki Yoshida
Keyword(s):  
Genetic Algorithm ◽  
Three Dimensional ◽  
Similarity Score ◽  
Hard Ball

Playing Hard Ball:

2012 ◽  
pp. 101-130
Keyword(s):  
Hard Ball

scholarly journals Examples of exponentially many collisions in a hard ball system

2020 ◽  
pp. 1-16
Author(s):  
DMITRI BURAGO ◽  
SERGEI IVANOV
Keyword(s):  
Initial Conditions ◽  
Hard Balls ◽  
Hard Ball

Abstract Consider the system of n identical hard balls in ${\mathbb {R}}^3$ moving freely and colliding elastically. We show that there exist initial conditions such that the number of collisions is exponential in n.

scholarly journals Long time behavior of stochastic hard ball systems

Bernoulli ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 681-710 ◽  
Author(s):  
Patrick Cattiaux ◽  
Myriam Fradon ◽  
Alexei M. Kulik ◽  
Sylvie Roelly
Keyword(s):  
Time Behavior ◽  
Long Time Behavior ◽  
Long Time ◽  
Hard Ball

Defuzzing tennis balls-for a shattering game of hard ball

1984 ◽  
Vol 61 (10) ◽  
pp. 907
Author(s):  
Leon S. Ciereszko
Keyword(s):  
Tennis Balls ◽  
Hard Ball
Sign in / Sign up

Export Citation Format

Share Document