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515 Uppsatser om Radio wave propagation - Sida 11 av 35

Design av stimuligenerator för radarmålsökare

During the development of microwave based sensors such as radar target seekers, input signals are needed to verify the performance of the system. Therefore, a channel board has been developed by previous thesis projects at Saab Bofors Dynamics. It uses a technique called Digital Radio Frequency Memory (DRFM). The purpose of this board is to sample and digitally store radio frequency signals in order to reconstruct them after a certain delay.The aim of this thesis project was to use the channel board named above to construct a portable instrument for generation of stimuli signals. This assignment has been divided into two tasks: firstly, to construct and put together the hardware components and secondly, to implement a graphical user interface for the instrument.

Bulleremissioner från vertikalaxlade vindkraftverk

Wind power in Sweden is expanding in response to the government's decision that 49% of Sweden's power should originate from renewable energy sources by the year 2020. Problems with noise and sound emissions related to wind turbines are a constant argument against the wind power expansion and this paper means to examine if vertical axis wind turbines might be a viable alternative to the conventional horizontal design for noise sensitive areas. In order to determine factors like difference in frequency, noise propagation and noise emission level, measurements of both horizontal and vertical axis wind turbines have been completed and the data analyzed with MATLAB. It is shown that there is a difference in how the noise from the two types of turbines propagates due to avariation in the frequency spectra of the emitted sound. It is also shown that vertical axis wind turbines generate a lower sound emission with less intensity inthe lower frequencies..

Hemautomation : Spara energi genom att automatisera hemmet

In today's society there is a significant focus on energy efficiency. Despite this, people leave lamps, televisions and computer screens etc. powered on unnecessarily. The goal of this project is to build a simple prototype for home automation where a user, via an application on a mobile phone, can switch on and off the power of an electrical products in the home and as well as being able to check whether such products are switched on or off. The prototype will also collect data on power consumption for these electrical products.

En studie av besöksantalet i tre tätortsnära skogar i Stockholmsområdet med hjälp av Radio Beam Counter : ett räkneverk baserat på radiovågsteknik

Forests affect its visitors in many positive ways. It is the acknowledgement of this fact that has prompted an EU-LIFE sponsored project entitled ?Urban forests for mankind?. It aims to lure or welcome more citizens near urban forests to experience nature in its many forms. In Sweden, three municipalities have decided to take the lead in this effort. Huddinge district, Haninge district, and the Royal Djurgården Administration in conjunction with The National Board of Forestry in Mälardalen are in the midst of this four year project (2001-2005).

Lateral epikondylalgia : evidens för stötvågsbehandling för smärtreducering och förbättrad handgreppsstyrka

SyfteSyftet med föreliggande studie var att försöka klargöra om stötvågsbehandling har någon effekt på smärta och handgreppstyrka hos patienter med lateral epikondylalgia.Frågeställningar1. Har stötvågsbehandling någon effekt på smärta hos patienter med lateral epikondylalgia, i så fall vilken?2. Har stötvågsbehandling någon effekt på handgreppsstyrka hos patienter med lateral epikondylalgia, i så fall vilken?MetodSökning av litteratur utfördes i PubMed, Cochrane, Cinahl och PEDro.

Spatial TDMA in Ad Hoc Networks with Antenna Arrays

In modern military operations the requirements of transmitting large amounts of information have increased substantially during the last decade. This increases the demand for high-capacity radio networks. It is also very important that military decisions are made on recent and correct information and this implies that low and known delays are required. The existing military radio ommunications, within the Swedish army, do not meet the requirements for capacity and delay. We have investigated how the capacity and average delay can be improved in an Ad Hoc network with STDMA by using antenna arrays.

Rapport för det gestaltande arbetet "Rampljuset" - realityradio

Det finns många så kallade dokusåpor, eller realityserier som vi kommer kalla dem i denna rapport, på teve. Från 1995, året då realityserien kom till Sverige i och med sändningen av ?The Real World Stockholm?, har antalet produktioner inom realitygenren ökat kraftigt. När vi i höstas gjorde en förundersökning gällande realityserier (?Den redigerade verkligheten ? en studie i realityseriers berättarteknik?) fann vi att radiomediet inte alls hade samma utbud inom realitygenren som teve har.

Perspektiv på erfarenheter av socialt arbete som potentiell skyddsfaktor

Alkohol förekommer i många människors vardag och det är ett fenomen vi har att förhålla oss till. Samtidigt är alkoholmissbruk ett stort socialt problem som vi ofta möter inom socialt arbete. Det är i vår mening därför alltid aktuellt att studera hur vi talar kring alkohol. Denna uppsats syftar till att belysa den bild av alkohol och alkoholmissbruk som framkommer i Sveriges Radio idag, vad detta får för konsekvenser för vår förståelse av alkohol som fenomen och av alkoholmissbruk som ett socialt problem. För att genomföra denna studie har vi använt oss av diskursanalys, mer specifikt så har vi använt oss av diskursteori som teoretiskt angreppssätt och metod.

Ekot från djupaste Afrika : En kritisk diskursanalys av nyhetsprogrammet Ekots gestaltning av konflikten i Goma, Demokratiska Republiken Kongo.

This is a critical discourse analysis of the conformation of the conflict in Goma, Democratic Republic of the Congo, as constructed by Ekot, a news-show on Radio Sweden. The ambition of this bachelor thesis is to examine the production of a Congolese conflict for a Swedish audience and to find out how the construction differences with and without a reporter in the field. To obtain this purpose the narrative is studied as well as the use of voices that define the conflict. The construction of proximity between Swedish audience and the Congolese event and the meaning of sound to stabilize the formation of discourse within foreign news is examined as well. To conform and explain foreign news it must be put in relation to a starting point.

Pianisten Hans Roland Orgenius: Först uppåtgående jazzstjärna sedan utkastad från jazzens finrum

Den unge blinde Hans Roland Orgenius hade fått en gedigen musikutbildning på Blindinstitutet Tomteboda när han vid 15 års ålder beslöt att prova på en karriär som jazzpianist. Efter skolan sökte han arbete på Sveriges Radio, där han fick anställning som pianist för att spela i flera radioprogram, ofta tillsammans med sin något äldre kamrat från Tomteboda, Reinhold Svensson. Han började också få spelningar i Stockholmstrakten och blev mycket populär framför allt för sitt sätt att spela boogie-woogie. På somrarna gjorde han turnéer på landsbygden bl a med sångaren Chris Dane. Hans framgångar gav honom skivkontrakt, först med Sonora och sedan Columbia, och han spelade in flera 78-varvsskivor under åren 1952-54.

PWM Effekt Audioförstärkare

The purpose with the report is to show that it is possible to design a class-D amplifier, using a programmable FPGA mounted on a developing card from Xess and a H-bridge. The FPGA was programmed in VHDL which is the language the software from Xilinx use to implement a logical function into the FPGA The logical function corresponds to a modeling of the music signal and the modeling can be described as a comparator which compare the music signal with a triangle wave and as a out signal produce a pulse width modulated (PWM) signal. The report is also a review and evaluating of two different modulating technologies, AD- modeling and BD-modeling. A detailed part about how the H-bridge was designed and how it works. The result of this project is a working audio amplifier to a significant lower price than the products in todays market..

Havsöringens (Salmo trutta) och laxens (Salmo salar) lekområden och lekvandring i Vindelälven och Piteälven :

The population of seatrout and salmon are threatened by over-fishing in the sea and loss of spawning and growing habitats caused by logging activities in many swedish rivers. The knowledge of the spawning migration and the habitat use of the seatrouts and salmon are limited. This study analyse the upstream spawning migration of Atlantic salmon and sea-running brown trouts from the lower part of the rivers to their spawning sites in the rivers Vindelälven and Piteälven. A knowledge about the distribution of spawning sites in the rivers will help these fish population in future restoration programs. In the fishladder at Norrfors in the river Umeälven were 29 sea trout and 20 salmon radio tagged and subsequently released and followed during their spawning migration upstream Vindelälven. They were tracked on their position in the river once a week.

Rabiata rabiesfeminister, orakade gaphalsar och andra aggressiva avarter : En studie av innehåll och argumentation i fyra feministiska bloggar

The purpose of this essay is to study how feminists portray themselves and their opinions about gender issues and other political matters in popular feminist blogs. The blogs that are studied are Lady Dahmer, Fanny Åström, Hanapee and Genusfolket. The overall essay questions are: How does the feminist bloggers present themselves? Which subjects are discussed in the feminist blogs? Which rhetorical devices does the feminist bloggers use? The theories that are used to answer the essay questions are the four spheres where there are inequality between the sexes, theories about third wave feminism, the rhetorical concepts ethos, logos and pathos and the SPADER-model for writing good argumentation. A descriptive method is used to study how the bloggers present themselves, a quantitative content analysis is used to count which subjects the bloggers write about and a qualitative rhetorical text analysis is used to study the rhetorical devices the bloggers use.The result shows that the two bloggers Lady Dahmer and Fanny Åström describe themselves with provocative words while the other blogs have more neutral descriptions.

FMCW-radar för mätning och beräkning av målbana

I detta arbete studeras möjligheterna att använda s.k. "Frequency-Modulated Continuous Wave radar" (FMCW-radar) för att mäta avstånd och radiell hastighet till ett mål. Vidare undersöks möjligheten att använda en följd av sådana mätdata för att skatta banparametrar för ett mål. Vi utför en två-dimensionell Fouriertransform på radardata. Genom att söka upp maximala värdet av transformerade datas absolutvärden erhåller vi en grov skattning av avstånd och radiell hastighet.

Neonate mortality in fallow deer (Dama dama) in relation to bed-site selection and habitat use

The level of neonate mortality in a free ranging fallow deer (Dama dama) population at the Koberg estate in south western Sweden was investigated using radio-tracking techniques. During this study a total of 36 fawns (17 ?, 19 ?) were captured and marked with vhf or gps radio collars; 12 fawns in 2008 and 24 fawns in 2009. The neonate mortality calculated by the Kaplan-Meier method was 23.6 % and the mortality caused by predation was low, since only 1 of 8 non-surviving fawns died from predation by red fox (Vulpes vulpes). The spatial behavior of the fallow deer neonates were examined at two different levels i.e.

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