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Ice fragments are generated by sublimation of ice particles in subsaturated conditions in natural clouds. Conceivably, such sublimational breakup would be expected to cause ice multiplication in natural clouds. Any fragment that survives will grow to become ice precipitation that may sublimate and fragment further. As a first step toward assessing this overlooked process, a formulation is proposed
In Part I, an electrification scheme was described and a simulation of an observed cold-based storm from the U.S. Great Plains was validated with electrical observations. Most charge in the storm was separated by rebounding collisions of secondary ice originating from prior graupel-snow collisions. In this Part II, sensitivity tests are performed with the control simulation (Part I) and influences
Most 3d human pose estimation methods assume that input – be it images of a scene collected from one or several viewpoints, or from a video – is given. Consequently, they focus on estimates leveraging prior knowledge and measurement by fusing information spatially and/or temporally, whenever available. In this paper we address the problem of an active observer with freedom to move and explore the
We study the task of embodied visual active learning, where an agent is set to explore a 3d environment with the goal to acquire visual scene understanding by actively selecting views for which to request annotation. While accurate on some benchmarks, today's deep visual recognition pipelines tend to not generalize well in certain real-world scenarios, or for unusual viewpoints. Robotic perception
The microphysical quasi-equilibrium in an ascending adiabatic parcel is elucidated by an analytical theory in 0D with drastic simplifications. The theory predicts how in-cloud activation is most likely to be triggered by the onset of precipitation during sufficient ascent, with the ascent only needing to approach almost twice the cloud-base updraft speed aloft. The precipitation and cloud condensa
The aim of this workshop was to discuss the needs and challenges in using high-resolution climate model outputs for impacts-relevant modeling. Development of impacts-relevant climate projections in the polar regions requires effective collaboration between regional climate modelers and impacts-relevant modelers in the design stage of high-resolution climate projections for the polar regions.
Due to limitations of IoT networks including limited bandwidth, memory, battery, etc., secure multicast group communication has gained more attention, and to enable that a group key establishment scheme is required to share the secret key among the group members. The current group key establishment protocols were mostly designed for Wireless Sensor Network, and they require device interaction, hig
Internet of Things (IoT) firmware upgrade has turned out to be a challenging task with respect to security. While Over-The-Air (OTA) software upgrade possibility is an essential feature to achieve security, it is also most sensitive to attacks and lots of different firmware upgrade attacks have been presented in the literature. Several security solutions exist to tackle these problems. We observe
● Syftet med denna rapport är att ge forskares analys av riksdagspartiernas klimatpolitik inför valet 2022.● Alla som har bidragit till denna rapport är klimat- eller omställningsforskare och medlemmar i Researchers’ Desk1.● Researchers’ Desk är en oberoende, ideell organisation, med över 80 ledande forskare i Sverige, som arbetar med olika aspekter av klimatförändringarna.● Alla de åtta politiska
In this paper we consider the epipolar geometry between orthographic and perspective cameras. We generalize many of the classical results for the perspective essential matrix to this setting and derive novel minimal solvers, not only for the calibrated case, but also for partially calibrated and non-central camera setups. While orthographic cameras might seem exotic, they occur naturally in many a
ELT science drivers stress aperture, Strehl ratio, PSF definition andstability, field of view, wavelength range, flexibility, lowpolarisation and thermal emittance, auxiliary instruments, site andinfrastructure. Applicable science categories are planets and planetarysystems, stars and stellar systems, galaxies and galaxy clusters, andcosmology. ELT observations are needed for our own and other pla
Hanteringen av stallgödsel i jordbruket orsakar en stor del av utsläppen av ammoniak i Sverige. För att uppnå Sveriges mål om att minska utsläppen av ammoniak behöver jordbrukare utföra åtgärder som minskar utsläppen av ammoniak. Samtidigt är det viktigt att ta hänsyn till hur åtgärder som minskar ammoniakutsläppen också kan bidra till att minska utsläpp av växthusgaserna metan och lustgas. Här di
As the effects of climate change, political upheaval and ravaging war are palpable, apocalyptic images as well as the concept ‘apocalyptic’ are today regularly invoked in politics, popular culture and mass media. This essay ponders the potential dangers of the apocalyptic imaginary, especially its tendency to encourage idealization of one’s own community and demonization of the other. As carriers
This article is the concluding essay of the Western and Northern Europe volume of Edinburgh University Press's series on Global Christianity.
Att odla ekologiskt istället för konventionellt bidrar till att öka den biologiska mångfalden. Den positiva effekten på biologiskmångfald är särskilt stor i odlingslandskap med få kvarvarande naturliga livsmiljöer som exempelvis naturbetesmarker. Samtidigt har sådana odlingslandskap ofta en hög jordbruksproduktion och därför är också kostnaderna i form av skördebortfall höga vid en övergång till e
This paper presents a discrete model of a sensor path planning problem, with a long-term planning horizon. The goal is to minimize the covariance of the reconstructed structures while meeting constraints on the length of the traversed path of the sensor. The sensor is restricted to move on a graph representing a discrete set of configurations, and additional constraints can be incorporated by alte
