993 resultados para Close air support


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Tutkimuksen tavoitteena on selvittää, miten monikäyttöinen UAV (Unmanned Aerial Vehicle) soveltuisi CAS-tehtäviin. UAV-laitteita käytetään moniin eri tehtäviin niin siviili- kuin sotilasmaailmassakin, ja niiden kehittämiseen käytetään maailmanlaajuisesti vuosi vuodelta enemmän resursseja. Kokemusta niiden käytöstä teknisesti yhtä vahvaa vihollista vastaan ei juurikaan ole, minkä vuoksi tässä tutkimuksessa painotetaan toimimista vihollisen maajoukkojen välittömässä läheisyydessä ja lähdetään siitä oletuksesta, että vihollisella on liikkuvaa ilmatorjuntaa mukana. Tämä on ratkaiseva ero UAV:eiden tähänastiseen ilmasta maahan -vaikuttamiseen nähden. Tutkimusta varten on kerätty julkisista lähteistä tietoa nykyaikaisten järjestelmien ominai-suuksista ja suorituskyvystä, minkä jälkeen niitä on tarkasteltu yleisten taktisten periaatteiden näkökulmasta. Yleisiin taktisiin periaatteisiin liittyvä teoria perustuu Mika Huttusen kirjoittamaan MPKK:n Taktiikan laitoksen julkaisuun Monimutkainen taktiikka. Eri järjestelmien ominaisuuksia tarkastelemalla on selvitetty, onko jollain niistä kannattavaa tai edes mahdollista toteuttaa tutkitun kaltaista tehtävää. Tutkimuksessa havaittiin, että ainakin esimerkkijärjestelmissä on muutamia puutteita, joiden vuoksi ne eivät ole tällä hetkellä järkeviä vaihtoehtoja CAS-toimintaan. Tulevaisuudessa tekniikan kehittyessä on kuitenkin täysin mahdollista, että perinteisen maataistelukoneen sijasta UAV:ta aletaan hyödyntää lähitulituen antamisessa.

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O presente Trabalho de Investigação Aplicada está subordinado ao tema “Apoio Aéreo nas Operações de Contrassubversão”. O desenvolvimento tecnológico alterou o paradigma da guerra, passando de guerra clássica ou convencional para guerra irregular. Os beligerantes dos conflitos deixaram de ser exércitos convencionais e passaram a ser milícias, grupos criminosos e organizações terroristas. O foco de atuação é redirecionado para a população em vez de componente militar do Estado opositor. Os elementos das forças irregulares provocam elevadas baixas nas tropas terrestres. Para reduzir esse número de baixas, existe uma ferramenta eficaz ao dispor das forças terrestres, apoio aéreo. O Teatro de Operações do Afeganistão envolveu vários Países na luta contra a insurgência, implicando uso de diferentes meios e táticas para combater a ameaça. Com esta investigação, pretende-se enunciar o papel do apoio aéreo nas operações de contrainsurgência no Afeganistão. A presente investigação é baseada no método de abordagem do problema indutivo, tendo como estudo de caso o Teatro de Operações do Afeganistão. Com esta investigação conclui-se, que o apoio aéreo desempenha papel fundamental no apoio à manobra terrestre. É uma ferramenta versátil e tem um tempo de resposta reduzido. Pode ser utilizado nas operações ofensivas e para garantir proteção da força nos deslocamentos. Por fim, o apoio aéreo é um elemento relevante nas operações psicológicas, uma vez que, basta a sua presença para intimidar o inimigo.

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Scientific collections are important sources of material for many areas of ornithological research. Although firearms (particularly shotguns) have been the standard for avian scientific collecting for more than 100 years, their use is restricted in many areas of the world. We describe a cheap, relatively silent, and effective air shotgun for collecting birds weighing up to 50 g at distances up to 4 m. This air shotgun is capable of shooting birdshot, uses hollow metal rivets connected to plastic straws as shot shells, and represents a simple adaptation of any 0.177 or 0.22 cal single-shot, break-barrel air rifle with at least 25 joules of muzzle energy. This air shotgun will be especially useful for focused sampling of birds (and other small vertebrates) in situations where firearm use or transport is restricted.

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Trypanosoma (Megatrypanum) melophagium is a parasite of sheep transmitted by sheep keds, the sheep-restricted ectoparasite Melophagus ovinus (Diptera: Hippoboscidae). Sheep keds were 100% prevalent in sheep from five organic farms in Croatia, Southeastern Europe, whereas trypanosomes morphologically compatible with T. melophagium were 86% prevalent in the guts of the sheep keds. Multilocus phylogenetic analyses using sequences of small subunit rRNA, glycosomal glyceraldehyde-3-phosphate dehydrogenase, spliced leader, and internal transcribed spacer 1 of the rDNA distinguished T. melophagium from all allied trypanosomes from other ruminant species and placed the trypanosome in the subgenus Megatrypanum. Trypanosomes from sheep keds from Croatia and Scotland, the only available isolates for comparison, shared identical sequences. All biologic and phylogenetic inferences support the restriction of T. melophagium to sheep and, especially, to the sheep keds. The comparison of trypanosomes from sheep, cattle, and deer from the same country, which was never achieved before this work, strongly supported the host-restricted specificity of trypanosomes of the subgenus Megatrypanum. Our findings indicate that with the expansion of organic farms, both sheep keds and T. melophagium may re-emerge as parasitic infections of sheep.

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In this work, new tools in atmospheric pollutant sampling and analysis were applied in order to go deeper in source apportionment study. The project was developed mainly by the study of atmospheric emission sources in a suburban area influenced by a municipal solid waste incinerator (MSWI), a medium-sized coastal tourist town and a motorway. Two main research lines were followed. For what concerns the first line, the potentiality of the use of PM samplers coupled with a wind select sensor was assessed. Results showed that they may be a valid support in source apportionment studies. However, meteorological and territorial conditions could strongly affect the results. Moreover, new markers were investigated, particularly focusing on the processes of biomass burning. OC revealed a good biomass combustion process indicator, as well as all determined organic compounds. Among metals, lead and aluminium are well related to the biomass combustion. Surprisingly PM was not enriched of potassium during bonfire event. The second research line consists on the application of Positive Matrix factorization (PMF), a new statistical tool in data analysis. This new technique was applied to datasets which refer to different time resolution data. PMF application to atmospheric deposition fluxes identified six main sources affecting the area. The incinerator’s relative contribution seemed to be negligible. PMF analysis was then applied to PM2.5 collected with samplers coupled with a wind select sensor. The higher number of determined environmental indicators allowed to obtain more detailed results on the sources affecting the area. Vehicular traffic revealed the source of greatest concern for the study area. Also in this case, incinerator’s relative contribution seemed to be negligible. Finally, the application of PMF analysis to hourly aerosol data demonstrated that the higher the temporal resolution of the data was, the more the source profiles were close to the real one.

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On-orbit exposures can come from numerous factors related to the space environment as evidenced by almost 50 years of environmental samples collected for water analysis, air analysis, radiation analysis, and physiologic parameters. For astronauts and spaceflight participants the occupational exposures can be very different from those experienced by workers performing similar tasks in workplaces on Earth, because the duration of the exposure could be continuous for very long orbital, and eventually interplanetary, missions. The establishment of long-term exposure standards is vital to controlling the quality of the spacecraft environment over long periods. NASA often needs to update and revise its prior exposure standards (Spacecrafts Maximum Allowable Concentrations (SMACs)). Traditional standards-setting processes are often lengthy, so a more rapid method to review and establish standards would be a substantial advancement in this area. This project investigates use of the Delphi method for this purpose. ^ In order to achieve the objectives of this study a modified Delphi methodology was tested in three trials executed by doctoral students and a panel of experts in disciplines related to occupational safety and health. During each test/trial modifications were made to the methodology. Prior to submission of the Delphi Questionnaire to the panel of experts a pilot study/trial was conducted using five doctoral students with the goals of testing and adjusting the Delphi questionnaire to improve comprehension, work out any procedural issues and evaluate the effectiveness of the questionnaire in drawing the desired responses. The remainder of the study consisted of two trials of the Modified Delphi process using 6 chemicals that currently have the potential of causing occupational exposures to NASA astronauts or spaceflight participants. To assist in setting Occupational Exposure Limits (OEL), the expert panel was established consisting of experts from academia, government and industry. Evidence was collected and used to create close-ended questionnaires which were submitted to the Delphi panel of experts for the establishment of OEL values for three chemicals from the list of six originally selected (trial 1). Once the first Delphi trial was completed, adjustments were made to the Delphi questionnaires and the process above was repeated with the remaining 3 chemicals (trial 2). ^ Results indicate that experience in occupational safety and health and with OEL methodologies can have a positive effect in minimizing the time experts take in completing this process. Based on the results of the questionnaires and comparison of the results with the SMAC already established by NASA, we conclude that use of the Delphi methodology is appropriate for use in the decision-making process for the selection of OELs.^

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This paper aims to present a preliminary version of asupport-system in the air transport passenger domain. This system relies upon an underlying on-tological structure representing a normative framework to facilitatethe provision of contextualized relevant legal information.This information includes the pas-senger's rights and itenhances self-litigation and the decision-making process of passengers.Our contribution is based in the attempt of rendering a user-centric-legal informationgroundedon case-scenarios of the most pronounced incidents related to the consumer complaints in the EU.A number ofadvantages with re-spect to the current state-of-the-art services are discussed and a case study illu-strates a possible technological application.

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"Issued: October 2, 1964."