| 41. |
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| 42. |
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| 43. |
- Andersson, L., et al.
(författare)
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The Langmuir Probe and Waves (LPW) Instrument for MAVEN
- 2015
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Ingår i: Space Science Reviews. - : Springer Science and Business Media LLC. - 0038-6308 .- 1572-9672. ; 195:1-4, s. 173-198
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Forskningsöversikt (refereegranskat)abstract
- We describe the sensors, the sensor biasing and control, the signal-processing unit, and the operation of the Langmuir Probe and Waves (LPW) instrument on the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. The LPW instrument is designed to measure the electron density and temperature in the ionosphere of Mars and to measure spectral power density of waves (DC-2 MHz) in Mars' ionosphere, including one component of the electric field. Low-frequency plasma waves can heat ions resulting in atmospheric loss. Higher-frequency waves are used to calibrate the density measurement and to study strong plasma processes. The LPW is part of the Particle and Fields (PF) suite on the MAVEN spacecraft. The LPW instrument utilizes two, 40 cm long by 0.635 cm diameter cylindrical sensors with preamplifiers, which can be configured to measure either plasma currents or plasma waves. The sensors are mounted on a pair of meter long stacer booms. The sensors and nearby surfaces are controlled by a Boom Electronics Board (BEB). The Digital Fields Board (DFB) conditions the analog signals, converts the analog signals to digital, processes the digital signals including spectral analysis, and packetizes the data for transmission. The BEB and DFB are located inside of the Particle and Fields Digital Processing Unit (PFDPU).
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| 44. |
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| 45. |
- Arharas, Ihsan, et al.
(författare)
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Epidemic modelling by birth-death processes with spatial scaling
- 2024
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Ingår i: Journal of Mathematics in Industry. - : Springer. - 2190-5983. ; 14:1
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Tidskriftsartikel (refereegranskat)abstract
- In epidemic modeling, interpretation of compartment quantities, such as s, i, and r in relevant equations, is not always straightforward. Ambiguities regarding whether these quantities represent numbers or fractions of individuals in each compartment rise questions about significance of the involved parameters. In this paper, we address these challenges by considering a density-dependent epidemic modelling by a birth-death process approach inspired by Kurtz from 1970s'. In contrast to existing literature, which employs population size scaling under constant population condition, we scale with respect to the area. Namely, under the assumption of spatial homogeneity of the population, we consider the quantities of susceptible, infective and recovered per unit area. This spatial scaling allows diffusion approximation for birth-death type epidemic models with varying population size. By adopting this approach, we anticipate to contribute to a clear and transparent description of compartment quantities and parameters in epidemic modeling.
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| 46. |
- Arlt, Debora
(författare)
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RESEARCH NEEDS AND RECOMMENDATIONS FOR THE USE OF CONSPECIFIC-ATTRACTION METHODS IN THE CONSERVATION OF MIGRATORY SONGBIRDS
- 2010
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Ingår i: Condor. - : Oxford University Press (OUP). - 0010-5422. ; 112, s. 252-264
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Tidskriftsartikel (refereegranskat)abstract
- Numerous studies have confirmed that when selecting habitat birds can use social information acquired from observing other individuals, and many aspects of this social information can be capitalized upon to manage bird populations. The conservation implications of attraction to conspecifics are especially promising for management, and as research progresses it is important to consider how this behavior can be applied to conservation practice. The biological underpinnings of conspecific attraction and the repercussions of manipulating species' distributions with attraction methods are not well understood, but conservation decisions often cannot wait for scientific research. Here we synthesize the current research on manipulation of songbirds by conspecific-attraction methods and review our knowledge gaps critically. We reviewed the published literature on conspecific-attraction experiments in songbirds and found that of 24 studies in which they were attempted, 20 were successful in attracting birds. Although many experiments have been successful in attracting conspecifics with various cues, we outline issues to be considered before songbirds are manipulated by attraction methods, and we highlight areas of research necessary to enhance the understanding of conspecific attraction and its use in conservation.
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| 47. |
- Arlt, Debora
(författare)
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Tornseglarprojektet i Uppsala
- 2018
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Ingår i: Fåglar i Uppland. - 0349-3911. ; 45, s. 38-42
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 48. |
- Bergman, Ann, et al.
(författare)
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Digitala strategier för att hantera relationen mellan arbete och övrigt liv
- 2020
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Ingår i: Att arbeta för lika villkor: Ett genus- och maktperspektiv på arbete och organisation. - 9789144135045
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Bokkapitel (refereegranskat)abstract
- Det här kapitlet fokuserar på relationen mellan arbetsliv och övrigt liv och ett antal digitala strategier som används för att hantera denna. Tidigare forskning har visat att kvinnor i jämförelse med män möter en större utmaning i hanterandet av denna gränsdragning, givet att kvinnor, traditionellt sett, har haft ansvaret för barn samt utfört mer av det obetalda arbetet i hemmet (Hochschild & Machung 2012). Kapitlet belyser denna gränsdragningsproblematik med ett specifikt fokus på hur den tar sig uttryck i samband med användandet av informations- och kommunikationsteknologi (IKT). De digitala gränshanteringsstrategierna kan förstås utifrån ett aktörsorienterat synssätt med fokus på individen, dennas intentioner och personliga preferenser. De kan även förstås utifrån ett strukturellt synsätt med fokus på strukturella villkor inom arbetsliv och privatliv. Kapitlet belyser hur aktör och struktur samverkar genom att presentera resultat från en kvalitativ studie av anställda inom industrin.
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| 49. |
- Brown, Barry, et al.
(författare)
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Ephemeral Photowork : Understanding the Mobile Social Photography Ecosystem
- 2016
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Ingår i: Proceedings of the Tenth International AAAI Conference onWeb and Social Media (ICWSM 2016). - : AAAI Press. - 2334-0770 .- 2162-3449. ; , s. 551-554
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Konferensbidrag (refereegranskat)abstract
- For many years, researchers have explored digital support for photographs and various methods of interaction around those photos. Services like Instagram, Facebook, and Flickr have demonstrated the value of online photographs in social media. Yet we know relatively little about these new practices of mobile social photography and in-situ sharing. Drawing on screen and audio recordings of mobile photo app use, this paper documents the ephemeral practices of social photography with mobile devices. We uncover how photo use on mobile devices is centered around social interactions both through online services, but also face-to-face around the devices themselves. We argue for a new role for the mobile photograph, supporting networks of communication through instantaneous interactions, complemented with rich, in person discussions of captured images with family and friends; photography not for careful selection and archive, but as quick social play and talk. The paper concludes by discussing the design possibilities of ephemeral communication.
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| 50. |
- Brown, Barry, et al.
(författare)
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Searchable Objects : Search in Everyday Conversation
- 2015
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Ingår i: Proceedings of the 18th ACM Conference on Computer Supported Cooperative Work & Social Computing. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450329224 ; , s. 508-517
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Konferensbidrag (refereegranskat)abstract
- This paper examines mobile internet search, presenting search not as a process of information retrieval, but as part of conversation and talk. Through video extracts of mobile search we explore how mobile phones are interwoven into talk, and how searchers manage the participation of other conversationalists alongside the search itself. We introduce the notion of a 'searchable object' -- an object that arises in conversation that can be searched for online -- and document how such an object occasions a search. In turn we discuss the differing roles of the device 'driver' and 'passenger', and how participation is managed through questions and narration. Rather than search being solely about getting correct information, conversations around search may be just as important. We conclude by critiquing some of the pessimistic views of interaction around mobile phones and their use in ordinary life and talk.
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