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Observatory Detects Extragalactic Cosmic Rays Hitting The Earth（图）
Observatory Detects Extragalactic Cosmic Rays Hitting Earth
2017/10/24
Fifty years ago, scientists discovered that the Earth is occasionally hit by cosmic rays of enormous energies. Since then, they have argued about the source of those ultra-high-energy cosmic rays—whet...
LOCAL-TO-GLOBAL PRINCIPLES FOR THE HITTING SEQUENCE OF A ROTOR WALK
LOCAL-TO-GLOBAL PRINCIPLES HITTING SEQUENCE ROTOR WALK
2015/8/14
In rotor walk on a finite directed graph, the exits from each vertex follow a prescribed periodic sequence. Here we consider the case of rotor walk where a particle starts from a designated source ver...
From hitting to tattling to gossip:An evolutionary rationale for the development of indirect aggression
dominance evolution of cooperation indirect reciprocity language prestige reputation
2015/7/10
Adult humans are characterized by low rates of intra-group physical aggression, relative to both human children and non-human animals. I propose that the suppression of physically aggressive tendencie...
On Exponential Limit Laws for Hitting Times of Rare Sets for Harris Chains and Processes
Hitting times regenerative process Harris recurrent Markov chains Harris recurrent Markov processes
2015/7/6
This paper provides a simple proof for the fact that the hitting time to an infrequently visited subset for a one-dependent regenerative process converges weakly to an exponential distribution. Specia...
Privacy and Security Risks and Requirements with Healthcare IT: Hitting a Home Run Instead of a Foul Ball
electronic discovery privacy security health information social media cloud computing wireless mobile devices
2014/12/20
Using baseball as a metaphor, this practical, engaging session will explore the security and privacy risks with a number of technologies for storing, handling and communicating health information and ...
Computing hitting times via fluid approximation: application to the coupon collector problem
Computing hitting times fluid approximation coupon collector problem Probability
2011/9/14
Abstract: In this paper, we show how to use stochastic approximation to compute hitting time of a stochastic process, based on the study of the time for a fluid approximation of this process to be at ...
The Hitting Times with Taboo for a Random Walk on an Integer Lattice
random walks on integer lattices hitting times taboo probabilities branching random walk
2011/8/26
Abstract: For a symmetric, homogeneous and irreducible random walk on d-dimensional integer lattice Z^d, having zero mean and a finite variance of jumps, we study the passage times (with possible infi...
Hitting distributions of simple random walks on Sierpinski graphs
In [Ka] Kaimanovich de ned an augmented rooted tree X for the
2011/2/25
In [Ka], Kaimanovich de ned an augmented rooted tree X for the d-dimensional Sierpinski gasket K. Let fZtg be the simple random walk on X,starting at the root ;.
Poincaré inequalities and hitting times
Poincar´ e inequalities Lyapunov functions hitting times log-concave measures
2011/2/25
Equivalence of the spectral gap, exponential integrability of hitting times and Lyapunov conditions are well known. We give here the correspondance (with quantitative results) for reversible diffusion...
On hitting times of affine boundaries by reflecting Brownian motion and Bessel processes
Reflecting Brownian motion Bessel process hitting time linear boundary
2011/1/20
Firstly, we compute the distribution function for the hitting time of a linear time-dependent boundary t 7→ a + bt, a ≥ 0, b ∈ R, by a reflecting Brownian motion.
Let T(μ)1 be the first hitting time of the point 1 by the Bessel process with index μ ∈ R
starting from x > 1.
A note on Schrödinger equation with linear potential and hitting times
Schrö dinger equation linear potential hitting times
2010/11/29
In this note we derive a solution to the Schr¨odingertype backward equation which satisfies a necessary boundary condition used in hitting-time problems [as described in Hern´andezdel-
Valle (2...
A model-insensitive determination of First-hitting-time densities with Application to Equity default-swaps
model-insensitive First-hitting-time densities Application Equity default-swaps
2010/10/18
Equity default-swaps pay the holder a fixed amount of money when the underlying spot level touches a (far-down) barrier during the life of the instrument. While most pricing models give reasonable re...
A model-insensitive determination of First-hitting-time densities with Application to Equity default-swaps
First-hitting-time densities Equity default-swaps
2010/4/27
Equity default-swaps pay the holder a fixed amount of money when the underlying spot level touches a (far-down) barrier during the life of the instrument. While most pricing models give reasonable res...
First hitting times and positions of concentric spheres for testing the drift of a diffusion process
First hitting times positions of concentric spheres a diffusion process
2009/9/23
First hitting times and positions of concentric spheres for testing the drift of a diffusion process。