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Accelerator Report: Overcoming setbacks, antiprotons return as LHC recovers luminescent brilliance（图）
加速器 反质子 强子对撞机
2023/6/12
The Accelerator Report published on 10 May highlighted that the 2023 antiproton physics run was delayed by 50 days (reducing the run to 122 days instead of the 172 initially scheduled) due to a broken...
Plant biodiversity struggles to return in wake of agricultural abandonment（图）
Plant biodiversity return agricultural abandonment
2019/12/6
Decades after farmland is abandoned, plant biodiversity and productivity struggle to recover, according to new University of Minnesota research.NSF-funded researchers examined 37 years of data tied to...
Lost Continent Of Zealandia:Scientists Return From Expedition To Sunken Land（图）
Lost Continent Zealandia Scientists Expedition Sunken Land
2017/10/24
After a nine-week voyage to study the lost, submerged continent of Zealandia in the South Pacific, a team of 32 scientists from 12 countries has arrived in Hobart, Tasmania, aboard the research vessel...
Seeing the Light:Army Ants Evolve to Regain Sight and More in Return to Surface’s Complex Environment
Seeing the Light Army Ants Evolve Surface’s Complex Environment
2016/3/21
A change to a more challenging environment could, over time, re-ignite and grow old parts of the brain that have gone inactive, according to a study of army ants led by a Drexel biology professor.
Folded nodes occur in generic slow-fast dynamical systems with two slow variables. Open regions
of initial conditions flow into a folded node in an open set of such systems, so folded nodes are an
i...
THE POTENTIAL OF DISCRETE RETURN, SMALL FOOTPRINT AIRBORNE LASER SCANNING DATA FOR VEGETATION DENSITY ESTIMATION
laser scanning correlation point cloud forestry land cover
2015/8/13
We evaluate the potential of deriving a vegetation leaf area index (LAI) from small footprint airborne laser scanning
data. Based on findings from large area histograms of discrete laser return...
Return probability for the loop-erased random walk and mean height in sandpile : a proof
Return probability the loop-erased random walk mean height Statistical Mechanics
2011/7/28
Return probability for the loop-erased random walk and mean height in sandpile : a proof.
Exponential return to equilibrium for hypoelliptic quadratic systems
Quadratic operators hypoellipticity return to equilibrium rate of convergence
2011/7/26
Abstract: We study the problem of convergence to equilibrium for evolution equations associated to general quadratic operators. Quadratic operators are non-selfadjoint differential operators with comp...
Pointwise characteristic factors for the multidimensional return times theorem
Pointwise characteristic factors multidimensional return times theorem
2011/1/21
This paper is an update and extension of a result the authors first proved in 2003. The goal of this paper is to study factors which are known to be L2-characteristic for certain nonconventional avera...
Optimal control of reverse logistics model with logistic demand and return rates
Optimal control reverse logistics model logistic demand return rates
2010/9/27
Pontryagin minimum principle (PMP) is applied in this paper to find the optimal control of the reverse logistics model of a production inventory system with deteriorating items. The total cost of the ...
Estimation of high return period flood quantiles using additional non-systematic information with upper bounded statistical models
return period flood quantiles additional non-systematic information
2010/12/22
This paper proposes the estimation of high return period quantiles using upper bounded distribution functions with Systematic and additional Non-Systematic information. The aim of the developed method...
Mapping snow depth return levels: smooth spatial modeling versus station interpolation
Mapping snow depth return levels smooth spatial modeling
2010/12/22
For adequate risk management in mountainous countries, hazard maps for extreme snow events are needed. This requires the computation of spatial estimates of return levels. In this article we use recen...
Global return maps for mixed-mode oscillations with one fast and two slow variables
Dynamical Systems (math.DS) Classical Analysis and ODEs (math.CA) Chaotic Dynamics (nlin.CD)
2010/11/10
Alternating patterns of small and large amplitude oscillations occur in a wide variety of physical, chemical, biological and engineering systems. These mixed-mode oscillations (MMOs) are often found i...
Multi-model assessment of stratospheric ozone return dates and ozone recovery in CCMVal-2 models
stratospheric ozone return dates ozone recovery CCMVal-2 models
2010/10/11
Projections of stratospheric ozone from a suite of chemistry-climate models (CCMs) have been analyzed. In addition to a reference simulation where anthropogenic halogenated ozone depleting substances ...
We show that the distribution of the first return time τ to the origin, v, of a simple randomwalk on an infinite recurrent graph is heavy tailed and non-concentrated.