Results 91 to 100 of about 18,958 (230)

Fast Spectral Variability from Cygnus X-1

, 2010
We have developed an algorithm that, starting from the observed properties of the X-ray spectrum and fast variability of an X-ray binary allows the production of synthetic data reproducing observables such as power density spectra and time lags, as well ...
Arévalo, Belloni, Belloni, Cui, Cui, Davies, Davis, Done, Gierliński, Johnson, Kotov, König, L. Stella, Leahy, Liu, Liu, Lochner, Maccarone, Miyamoto, Miyamoto, Negoro, Nowak, Pottschmidt, Pottschmidt, Press, Revnivtsev, T. M. Belloni, Terrell, Timmer, Uttley, Van Der Klis, Vaughan, Vaughan, Wilms, Wu, Y. X. Wu, Zdziarski, Zhang, Zoghbi   +38 more
core   +1 more source

Gamma-ray burst engines may have no memory

, 2014
A sizeable fraction of gamma-ray burst (GRB) time profiles consist of a temporal sequence of pulses. The nature of this stochastic process carries information on how GRB inner engines work.
Baldeschi, A., Guidorzi, C.
core   +1 more source

A model of tuberculosis clustering in low incidence countries reveals more transmission in the United Kingdom than the Netherlands between 2010 and 2015.

PLoS Computational Biology, 2020
Tuberculosis (TB) remains a public health threat in low TB incidence countries, through a combination of reactivated disease and onward transmission. Using surveillance data from the United Kingdom (UK) and the Netherlands (NL), we demonstrate a simple ...
Ellen Brooks-Pollock, Leon Danon, Hester Korthals Altes, Jennifer A Davidson, Andrew M T Pollock, Dick van Soolingen, Colin Campbell, Maeve K Lalor   +7 more
doaj   +1 more source

Catch-per-unit-effort: which estimator is best? Captura por unidade de esforço: qual estimador é melhor?

Brazilian Journal of Biology, 2010
In this paper we examine the accuracy and precision of three indices of catch-per-unit-effort (CPUE). We carried out simulations, generating catch data according to six probability distributions (normal, Poisson, lognormal, gamma, delta and negative ...
M. Petrere Jr., HC. Giacomini, P. De Marco Jr.   +2 more
doaj  

Predicted and Verified Deviations from Zipf's law in Ecology of Competing Products

, 2011
Zipf's power-law distribution is a generic empirical statistical regularity found in many complex systems. However, rather than universality with a single power-law exponent (equal to 1 for Zipf's law), there are many reported deviations that remain ...
A. Saichev, B. Mandelbrot, D. Sornette, Didier Sornette, G. Zipf, R. Gibrat, Ryohei Hisano, Takayuki Mizuno, V. Pareto, Y. Ijiri   +9 more
core   +1 more source

Sensing Coverage Prediction for Wireless Sensor Networks in Shadowed and Multipath Environment

The Scientific World Journal, 2013
Sensing coverage problem in wireless sensor networks is a measure of quality of service (QoS). Coverage refers to how well a sensing field is monitored or tracked by the sensors.
Sushil Kumar, D. K. Lobiyal
doaj   +1 more source

Word Length in Political Public Speaking: Distribution and Time Evolution

Entropy
In this paper, word length in the texts of public speeches by USA and UK politicians is analyzed. More than 300 speeches delivered over the past two hundred years were studied. It is found that the lognormal distribution better describes the distribution
Natalia L. Tsizhmovska, Leonid M. Martyushev   +1 more
doaj   +1 more source

Biases in the Maximum Simulated Likelihood Estimation of the Mixed Logit Model

Econometrics
In a recent study, it was demonstrated that the maximum simulated likelihood (MSL) estimator produces significant biases when applied to the bivariate normal and bivariate Poisson-lognormal models.
Maksat Jumamyradov, Murat Munkin, William H. Greene, Benjamin M. Craig   +3 more
doaj   +1 more source

Simulation of risk processes [PDF]

The simulation of risk processes is a standard procedure for insurance companies. The generation of simulated (aggregated) claims is vital for the calculation of the amount of loss that may occur.
Burnecki, Krzysztof, Härdle, Wolfgang Karl, Weron, Rafał   +2 more
core  

Stage duration distributions in matrix population models

Ecology and Evolution, 2018
Matrix population models are a standard tool for studying stage‐structured populations, but they are not flexible in describing stage duration distributions. This study describes a method for modeling various such distributions in matrix models.
Toshinori Okuyama
doaj   +1 more source