A practical system for regional mobile satellite services

The Regional Mobile Satellite (MSAT) concept proposes a worldwide, interconnected mobile satellite service (MSS) network in which MSAT-type satellites provide the space segment services to separate regions (i.e., one or a few countries). Using this concept, mobile communications users across entire continents can now be served by a handful of regionally controlled satellites in geostationary earth orbit (GEO). All requirements, including hand-held telephone capabilities, can be cost-effectively provided using proven technologies. While other concepts of regional or global mobile communications continue to be explored, the Hughes Regional MSAT system demonstrates the near-term viability of the GEO approach

[Editorial] Habitability Beyond Earth

The question of whether Earth is a unique location for life remains one of the most enduring questions of our time. Geochemical data suggests that habitable environments may exist, or may have existed, elsewhere in the Solar System with promising targets including Mars and icy bodies where liquid water is believed to exist (Kargel, 2000; Grotzinger et al., 2014; Glein et al., 2015). Furthermore, potential habitable Exoplanets have been discovered where potentially there is sufficient atmospheric pressure to maintain liquid water (Jenkins et al., 2015; Gillon et al., 2017; Orosei et al., 2018). Yet, for life to exist it is not solely dependent on liquid water as it also needs bio-essential elements, an energy source, and the environmental conditions, that are conducive to life (Nixon et al., 2013). To investigate the feasibility of life elsewhere in the Solar System a combination of field and laboratory based studies, in-situ space experiments, and theoretical modeling is required. Here, we present 14 original research papers, one mini review, and two hypothesis and theory papers highlighting the novel and diverse methods that are employed to investigate potential life beyond the Earth. The overall focus of this collection of work is to understand if terrestrial life could exist elsewhere in the Solar System, and if so, what evidence (bio-signatures) could be used to support or negate the hypothesis of life

A self-adaptive SEU mitigation system for FPGAs with an internal block RAM radiation particle sensor

In this paper, we propose a self-adaptive FPGA- based, partially reconfigurable system for space missions in order to mitigate Single Event Upsets in the FPGA configuration and fabric. Dynamic reconfiguration is used here for an on-demand replication of modules in dependence of current and changing radiation levels. More precisely, the idea is to trigger a redundancy scheme such as Dual Modular Redundancy or Triple Modular Redundancy in response to a continuously monitored Single Event Upset rate measured inside the on-chip memories itself, e.g., any subset (even used) internal Block RAMs. Depending on the current radiation level, the minimal number of replicas is determined at run- time under the constraint that a required Safety Integrity Level for a module is ensured and configured accordingly. For signal processing applications it is shown that this autonomous adaption to the different solar conditions realizes a resource efficient mitigation. In our case study, we show that it is possible to triplicate the data throughput at the Solar Maximum condition (no flares) compared to a Triple Modular Redundancy implementation of a single module. We also show the decreasing Probability of Failures Per Hour by 2 × 104 at flare-enhanced conditions compared with a non-redundant system. Our work is a part of the In-Orbit Verification of the Heinrich Hertz communication satellite

ANTIBIOTICS RESISTANCE – The Nurses Struggle

Bacheloroppgave sykepleie, 2016Bakgrunn: Antibiotikaresistente bakterier er et økende problem globalt, men også nasjonalt. Som sykepleiere vil vi kunne møte på pasienter som har infeksjoner med antibiotikaresistente bakterier. Hva er vårt ansvar i møte med denne pasientgruppen, og har vi nok kunnskaper til å kunne utøve faglig forsvarlig sykepleie? Metode: Dette er en litteraturstudie hvor vi har anvendt pensumlitteratur, forskningsartikler og annen relevant litteratur for å drøfte oss frem til svar på en problemstilling. Resultater: Vår rolle som sykepleiere innenfor dette feltet er ikke tydelig definert. Vi har forebyggende, pleiende og helsefremmende funksjoner, uten at det er nøye beskrevet hva vi skal gjøre, det finnes dog mange retningslinjer, veiledere og prosedyrer på tiltak. Det er i forskning gjort funn på at sykepleiere med lite kunnskap om antibiotikaresistens føler seg mye mer utrygg i møte med denne pasientgruppen. I tillegg er det også gjort funn på at pasienter som får infeksjoner med antibiotikaresistente bakterier føler de får lite informasjon og dårlig behandling av helsevesenet. Vi har drøftet begrepet «opplevelse av sammenheng» og sett på om kunnskapsøkning vil kunne ha en positiv innvirkning på faglig trygghet og praktisk håndtering. Konklusjon: Vi har ikke funnet forskning som sier at kunnskapsøkning gir den ønskede effekten vi er ute etter, men mangel på kunnskap kan være en årsak på den faglige utryggheten, og den dårlige pasientbehandlingen pasientene selv har rapportert inn. Ergo kan det være grunnlag for å se at systematisk kunnskapsøkning vil ha en positiv innvirkning

Nutritional status of woody species of two semideciduous forests in Uberlândia, MG

O estudo teve como objetivo determinar a influência da fertilidade sobre nutrição mineral e distribuição das espécies nativas em duas florestas semidecíduas na Fazenda Experimental de Glória (FEG) e Estação Ecológica do Panga (EEP) em Uberlândia, MG. Foram amostradas de duas a quatro árvores, com circunferência mínima de 10 cm, a altura de 1,30 m do solo, de todas as espécies encontradas em 50 parcelas contíguas de 10 m X 10 m, em cada floresta. Foram analisadas amostras de solo dos horizontes A1 e A3 de cada parcela nas duas florestas. O solo da EEP apresentou menor acidez, associada à maior disponibilidade de Ca e menor disponibilidade de Al, Fe, Zn e Cu. A disponibilidade Mn foi menor no horizonte A3 e maior no A1 na EEP. As concentrações foliares de Ca e K foram maiores nas espécies da EEP. As diferenças no teor de Ca refletiram a maior disponibilidade do nutriente no solo. Não houve diferenças nas concentrações foliares de P e Mg. O teor médio de N foi maior na floresta FEG do que na EEP, apenas em espécies exclusivas. As concentrações de Mn foram menores na EEP, refletindo a influência do pH na absorção deste nutriente. Assim, a ocorrência de espécies presentes exclusivamente na EEP pode estar associada à capacidade de absorver K e Mg de solos com altos teores de Ca.The objective of this study was to determine the influence of soil fertility on the mineral nutrition and distribution of native species in two semideciduous forests at the Experimental Farm at Gloria (FEG) and the Ecological Station at Panga (EEP) in Uberlândia, MG. Leaf samples were collected from two to four individuals with a minimum circumference of 10 cm at 1,30 m height of all species within 50 contiguous plots of 10 m X 10 m in each forest. Soil samples were analyzed from the A1 e A3 horizons of each plot of both areas. The soil of EEP showed lower acidity, higher availability of Ca and lower availability of Al, Fe, Zn and Cu. The availability of Mn was lower in the A3 horizon and higher in the A1 horizon at EEP. The foliar concentrations of Ca e K were higher at EEP which reflected the higher levels in soil. There were no differences in the concentrations of P, Mg, Fe, Cu and Zn. The N concentrations were higher among species occurring exclusively at FEG. The Mn concentrations were lower at EEP, reflecting the effect of pH on its absorption. Thus the occurrence of some species exclusively at EEP seemed to be associated with their ability to absorb K and Mg from soils with high Ca availability

Detection of phosphates originating from Enceladus’s ocean

Saturn’s moon Enceladus harbours a global1 ice-covered water ocean2,3. The Cassini spacecraft investigated the composition of the ocean by analysis of material ejected into space by the moon’s cryovolcanic plume4,5,6,7,8,9. The analysis of salt-rich ice grains by Cassini’s Cosmic Dust Analyzer10 enabled inference of major solutes in the ocean water (Na+, K+, Cl–, HCO3–, CO32–) and its alkaline pH3,11. Phosphorus, the least abundant of the bio-essential elements12,13,14, has not yet been detected in an ocean beyond Earth. Earlier geochemical modelling studies suggest that phosphate might be scarce in the ocean of Enceladus and other icy ocean worlds15,16. However, more recent modelling of mineral solubilities in Enceladus’s ocean indicates that phosphate could be relatively abundant17. Here we present Cassini’s Cosmic Dust Analyzer mass spectra of ice grains emitted by Enceladus that show the presence of sodium phosphates. Our observational results, together with laboratory analogue experiments, suggest that phosphorus is readily available in Enceladus’s ocean in the form of orthophosphates, with phosphorus concentrations at least 100-fold higher in the moon’s plume-forming ocean waters than in Earth’s oceans. Furthermore, geochemical experiments and modelling demonstrate that such high phosphate abundances could be achieved in Enceladus and possibly in other icy ocean worlds beyond the primordial CO2 snowline, either at the cold seafloor or in hydrothermal environments with moderate temperatures. In both cases the main driver is probably the higher solubility of calcium phosphate minerals compared with calcium carbonate in moderately alkaline solutions rich in carbonate or bicarbonate ions

Caracterização dos Solos e da Estrutura Fitossociológica da Vegetação de Veredas da Chapada no Triângulo Mineiro

The paths stand out as a surface drainage system composed of the drainage network with waterways that occupies the broad interfluvia within the Cerrado domain. Footpaths in the soils are formed under conditions of poor drainage. In those circumstances there is a tendency for the formation of lowlands. In order to investigate the importance and the use given to the natural resources of the paths by the rural population of the city of Uberlândia-MG interviews were conducted with 20 landowners. The paths are shown as a source of water for easy access. According to respondents the paths have good quality water for domestic use, except in damming conditions where water gets yellowish, with the presence of reddish mud and rust flavor. Water for human consumption, for the most part is obtained from artesian wells...Keywords: Paths; Cerrado; Edaphic Studies; Uberlândia.As veredas se destacam como um sistema de drenagem superficial composto pela rede de drenagem com cursos d’água que ocupa os interflúvios largos dentro do domínio Cerrado. Nas Veredas os solos são formados sob condições de drenagem deficiente. Nestas condições há uma tendência para a formação de solos hidromórficos. Com o objetivo de investigar a importância e o uso dado para os recursos naturais das veredas pela população rural do município de Uberlândia-MG foram realizadas entrevistas com 20 proprietários rurais. As veredas apresentam-se como uma fonte de água de fácil acesso. Segundo os entrevistados as veredas possuem água de boa qualidade, para uso doméstico, salvo em condições de represamento onde a água adquire coloração amarelada, com presença de lodo avermelhado e sabor ferruginoso. A água para consumo humano, em sua maior parte é obtida de poços artesianos...Palavras-Chave: Veredas; Cerrado; Estudos Edáficos; Uberlândia