983 resultados para Schottky, Diodos de barreira de


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Os resíduos deixados sobre o solo por ocasião da colheita mecanizada da cana-de-açúcar podem constituir-se em uma barreira física para a ação dos herbicidas no controle de plantas daninhas, quando aplicados em pré-emergência destas plantas sobre a palha da cana. em virtude disso, o presente trabalho teve por objetivos analisar e quantificar a interferência dessa camada de palha sobre o solo na ação dos herbicidas imazapic e imazapic + pendimethalin no controle de plantas daninhas em áreas onde a cana-de-açúcar foi colhida mecanicamente sem a queima da palhada previamente à colheita. Foram realizados dois ensaios simultâneos: um com a retirada da palha dois dias após a aplicação dos herbicidas e o outro com a manutenção desta, ambos conduzidos em casa de vegetação. O imazapic isolado foi aplicado nas dosagens de 0, 122,5 e 147 g i.a.ha-1 e em mistura com pendimethalin na dosagem de 75 + 1500 g i.a.ha-1, com simulação de chuvas nas intensidades de 30, 60 e 90 mm. Após análise dos resultados de biomassa seca, altura e número de folhas das plantas de Sorghum bicolor e Cyperus rotundus, além de nota visual e biomassa seca de Panicum maximum, Brachiaria plantaginea, Digitaria horizontalis, Amaranthus viridis, Ipomoea grandifolia e Brachiaria decumbens, constatou-se eficiência proporcional dos herbicidas à dosagem utilizada, independentemente da presença da palha, à exceção de Ipomoea grandifolia e Brachiaria decumbens, além de haver menor controle nos tratamentos submetidos à chuva de 90 mm. Esses resultados indicam boas perspectivas quanto à aplicação destes herbicidas em áreas de colheita mecanizada de cana-de-açúcar sem queima, para controle de plantas daninhas em condições de pré-emergência.

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Neste trabalho, objetivou-se estudar a seletividade de imazapic a dois cultivares de amendoim (Tatu Vermelho e IAC-5), em condições de ausência e de presença de palha de cana-de-açúcar. O experimento foi instalado em vasos, em delineamento inteiramente casualizado, com os tratamentos dispostos em esquema fatorial 3x2, com quatro repetições. Constituíram os fatores principais três doses de imazapic (0, 98 e 140 g ha-1), aplicadas em pré-emergência sobre duas condições de palha de cana-de-açúcar (0 e 15 t ha-1). Constatou-se que a camada de palha possui potencial em reter o herbicida, especialmente sob períodos de pouca precipitação ou irrigação; as plantas de amendoim sob esta condição apresentaram menos sintomas de intoxicação. Entretanto, na ausência da palha, as plantas, independentemente do cultivar, apresentaram maiores injúrias visuais e redução na altura, massa seca da parte aérea e raiz.

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Kalanchoe brasiliensis Cambess (Crassulaceae), commonly known as saião , coirama branca , folha grossa , is originally from Brazil and commonly found in São Paulo to Bahia, mainly in the coastal zone. Regarding of biological activities, most preclinical studies were found in the literature, mainly about the anti-inflammatory activity of extracts obtained from leaves and / or aerial parts of K. brasiliensis. As regards the chemical constitution, it has been reported mainly the presence of flavonoids in the leaves of the species, but until this moment did not knows which are the active compounds. Although it is a species widely used in traditional medicine in Brazil, there is no monograph about the quality parameters of the plant drug. In this context, this study aims to characterize and quantify the chemical markers of hydroethanolic extract (HE) from the leaves of K. brasiliensis, which can be used in quality control of plant drug and derivatives obtained from this species. The methodology was divided into two parts: i. Phytochemical study: to fractionate, isolate and characterizate of the chemical (s) marker (s) of the HE from the leaves of K. brasiliensis; ii. To Developed validate of analytical method by High Performance Liquid Chromatography (HPLC)-diode array detector (DAD) to quantify the chemical (s) marker (s) of the EH. i. The EH 50% was prepared by turbo extraction method. It was then submitted to liquid-liquid partition, obtaining dichloromethane, n-butanol and ethyl acetate (AcOEt) fractions. The AcOEt fraction was selected to continue the fractionation process, because it has a chemical profile rich in flavonoids. The acOEt fraction was submitted to column chromatography using different systems for obtaining the compound Kb1. To identify this compound, it was submitted to UV analysis ii. For quantitative analysis, the EH was analyzed by HPLC, using different methods. After selecting the most appropriate method, which showed satisfactory resolution and symmetrical peaks, it was validated according to parameters in the RE 899/2003. As result, it was obtained from the AcOEt fraction the compound Kb1 (2.7 mg). Until this moment, the basic nucleus was characterized by UV analysis using shift reagents. The partial chemical structure of the compound Kb1 was identified as a flavonol, containing hydroxyls in 3 , 4 position (ring A), 5 and 7 free (ring B) and a replacement of the C3 hydroxyl by a sugar. As the analysis were performed in the HPLC coupled to a DAD, we observed that the UV spectrum of the major peaks of EH from K. brasiliensis shown similar UV spectrum. According to the literature, it has been reported the presence of patuletin glycosydes derivatives in the leaves of this species. Therefore, it is suggested that the compound Kb1 is glycosylated patuletin derivative. Probably the sugar (s) unit(s) are linked in the C3 in the C ring. . Regarding the development of HPLC analytical method, the system used consists of phase A: water: formic acid (99,7:0,3, v / v) and phase B: methanol: formic acid (99,7:0,3, v / v), elution gradient of 40% B - 58% B in 50 minutes, ccolumn (Hichrom ®) C18 (250x4, 0 mm, 5 μm), flow rate 0.8 mL / min, UV detection at 370 nm, temperature 25 ° C. In the analysis performed with the co-injection of thecompound Kb1 + HE of K. brasiliensis was observed that it is one of the major compounds with a retention time of 12.47 minutes and had a content of 15.3% in EH of leaves from K. brasiliensis. The method proved to be linear, precise, accurate and reproducible. According to these results, it was observed that compound Kb1 can be used as a chemical marker of EH from leaves of K. brasiliensis, to assist in quality control of drug plant and its derivatives

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This paper examines two aspects. First, the symbolic dimension of politics and some of the elements that make up this universe, as the scenario, the representation, the myth, the spectacle, the media and the political and electoral marketing. We assume that the policy brings together a set of traits related to both reason and the human subjectivity, and can not be summed up in just a few calculations based on rationality. In the case of elections, in a process (ritual, according Irlys Barrier) of choice, there is a meeting of two systems of representations: to that transmitted by a political actor, in a scene from a particular context, based on a life trajectory unique, and the other from the public, crossed by social relations, situations own wishes, desires, expectations and unique perspectives. Between them there are the means of mass media (especially television), and with them the advent of language media and advertising applied to politics, changing the layout of public visibility and inaugurating what Rejane Accioly Carvalho will call the "aesthetics of mostrabilidade". This does not necessarily mean a preponderance of media on politics as a whole but only its adaptation to that with regard to contact with the public, the ad extra portion of the policy, according to Wilson Gomes. In a second aspect, try to apply these elements to a specific study to verify them in building an effective public image, in this case, the current governor of Rio Grande do Norte, Wilma de Faria. The concept of public image is from the book of Wilson Gomes The transformation was visible in the mass media, and relates to a conceptual image to fix "personality traits" through political history, personal conduct, action of image makers and the public reception. For this we will review some videos aired on Free Time for political propaganda in the years 2002 and 2006.

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The proposal of this study was to work with women in the politics, focusing on their trajectories, biographies and speeches, to catch the meanings given by themselves to their insertion in the political field. The privileged instrument of research was the autobiographical narratives of fifteen women who, in Paraíba, had participated of the electoral processes and the life partisan politics in the period from 1998 to 2008, in the state and federal scopes. This permitted us to search the dimension of their lived expericence, to understand the trajectories and the processes of autonomation of the women, in the politics. Moreover, a quantitative mapping of the feminine presence in the processes was made electoral politicians in a wider context. In a similar way, two surveys had been carried throughout the research, among others aspects, to understand that image voters and politicians they construct concerning the feminine participation in this field. These instruments were important not to lose of all the social view where these lives were developed, the places from which these women speak and locate and the social meanings originated from this participation. The research aimed to establish dialogues between knowing and fields of discipline, beyond the dichotomy of actor/structure, preventing generalizations that ignore the plurality of the individuals, to reveal some aspects of the complex and contradictory processes that involve their participation in the political field. At last, it is tried to show that, although the frequent accusations of autonomy lack, when establishing relations in the public space, the women, as all subjects, can reflect about themselves, the motives of their thoughts and their actions escaping from the servitude of the repetition and avoid being only product of the institution that formed them (CASTORIADIS, 1992, p.140-141)

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Ce travail analyse la portée subjective des Choix Électoraux à travers la notion psychanalytique du désarroi humain. Nous avons développé cette recherche ayant pour référence la pensée de Freud et de Lacan et suivant les jalons posés par les penseurs des sciences sociales nous nous sommes rapprochées de la réalité sociale pour y « atteindre sur son horizon la subjectivité de notre époque ». La condition de désarroi fait partie de la structuration du sujet, du fait qu il dépend entièrement de l Autre pour se construire. Cependant l être humain se crée des mécanismes pour se protéger du désarroi absolu, il trouve des arts de vivre qui lui rendent plus facile sa condition d être. Les idéaux, les pactes sociaux ce sont des modalités de sécurité sans lesquelles le sujet fixe ses particularités sans s engager dans le processus civilisatoire. Nous caractérisons la société contemporaine par la chute successive d une série d idéaux qui fait monter de plus en plus le désarroi. Dans l absence d idéaux sociaux et politiques sur lesquels l électeur puisse se repérer, nous remaquons une tendance vers l individualisme et vers l absence d investissements dans des projets colectifs. Cette façon d opérer se dévoile aussi au moment de choisir un candidat, ce qui se base sur la logique du particulier motivée par des perspectives individuelles, sans liens avec la promotion de la vie publique. Notre enquête a été réalisée à Natal durant la campagne électorale de 2002. Notre objectif est de comprendre surtout la logique des choix électoraux de la population de la périphérie, celle qui se trouve devant un double désarroi : celle de sa condition humaine et celle qu advient de la précaire condition de subsistance. Nous soutenons que l idée selon laquelle le candidat, par la position qu il occupe dans la société, détient la fonction d offrir quelques garanties à l électeur et de cette manière il entre dans la série de ce qui peut soulager et promouvoir un certain réconfort aux personnes, même si l on considère le fait que l électeur ne croit plus à ses représentants. Nous sommes partis des questions suivantes: comment identifier la dimension subjective des choix électoraux et de quelle manière celle-ci se manifeste-t-elle de nos jours ? Comment se passe le choix éléctoral de la population qui est à la marge du système? La thèse que nous soutenons est que l état de désarroi est un substrat subjectif qui est la base de tout choix éléctoral mais qui se configure de façon différenciée à partir des références de l électeur, de son contexte historique, des facteurs économiques, etc. Le sujet, face à son désarroi, construit des chemins pour pouvoir soutenir son existence ce que nous appellons ici un Projet Directionnel. Ce facteur directionnel est l un des éléments de motivation des électeurs dans leurs choix électoraux

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Estudaram-se o perfil eletroforético das proteínas liquóricas e a cota de albumina em cães sem e com cinomose na fase neurológica e não-neurológica. A punção da cisterna magna para a obtenção de amostras de liquor realizou-se em 30 cães. Analisaram-se teores de proteínas totais, cota de albumina e fracionamento eletroforético das proteínas liquóricas em gel de agarose. Os resultados foram semelhantes nos cães normais e nos cães com cinomose sem sinais neurológicos e significativamente elevados no grupo de cães com cinomose apresentando sinais neurológicos. O estudo do quadro protéico do líquido cérebroespinhal foi útil e contribuiu significativamente na detecção de lesões ao sistema nervoso central e de danos à barreira hematoencefálica durante a fase neurológica da cinomose.

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A adição de óleos à calda de pulverização, muitas vezes, é utilizada a campo sem o adequado conhecimento sobre a absorção do produto fitossanitário pelo alvo, retenção de calda e até mesmo sobre a praga e a cultura. O objetivo do trabalho foi avaliar o efeito da adição de óleos ao acaricida cyhexatin sobre o ácaro Brevipalpus phoenicis e na retenção de calda por folhas de citros. Avaliou-se a mortalidade de ácaros, utilizando-se de frutos de laranja com uma arena circundada com cola entomológica para confinar os ácaros. Adotou-se o delineamento inteiramente casualizado, em esquema fatorial, constituído pelos fatores: duas formulações de cyhexatin (WG e SC), dois tipos de óleo (mineral e vegetal) e duas concentrações dos óleos (0,5 e 1,0%), e mais dois tratamentos adicionais (acaricidas não adicionados de óleo) e uma testemunha sem aplicação. A aplicação dos produtos foi realizada sobre frutos de laranja até além do ponto de escorrimento. Logo após a aplicação, transferiram-se 10 ácaros B. phoenicis para cada fruto.A contagem dos ácaros vivos, mortos e retidos na barreira adesiva foi realizada um dia após a aplicação. Para a determinação da quantidade de calda retida, utilizaram-se folhas de laranjeira, que foram pulverizadas até além do ponto de escorrimento, adotando-se os mesmos tratamentos e o delineamento estatístico mencionados para a avaliação da mortalidade de ácaros, com exceção da testemunha sem aplicação. Determinou-se a massa de líquido retido após a aplicação dos produtos por folha, com auxílio de balança de precisão. Verificou-se que um dia após a aplicação dos produtos, todos os tratamentos apresentaram mortalidade de B. phoenicis acima de 99%. Dessa forma, a adição de óleo, seja mineral, seja vegetal, ao acaricida cyhexatin não afetou a eficácia biológica deste acaricida nas formulações SC e WG. A maior fuga de B. phoenicis para a barreira de cola foi verificada nos tratamentos com adição de óleos, em comparação ao cyhexatin aplicado isoladamente. A adição de óleo, seja mineral, seja vegetal, ao cyhexatin na calda de pulverização reduziu a quantidade máxima de líquido retido pelas folhas de citros, podendo contribuir para a redução da quantidade de calda necessária para uma boa cobertura da planta.

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Foram estudados os aspectos morfológicos de nove placentas de paca (Agouti paca, L., 1766) mediante análises em microscopia de luz e eletrônica de transmissão dos fragmentos teciduais correspondentes à porção de maior conexão placentária em diferentes fêmeas gestantes, nos estágios intermediário e final da prenhez. Realizamos este estudo, pois, aliada à necessidade da procura de novas espécies que atuem como modelos experimentais adequados, havia a disponibilidade deste roedor em nosso meio; por outro lado, o melhor conhecimento dos aspectos reprodutivos destes animais oferece subsídios ao estabelecimento de criatórios racionais desta espécie, uma vez que a preservação deste vertebrado é necessária, além do grande interesse comercial em torno de sua carne. Os resultados mostraram que este roedor possui uma placenta do tipo vitelina e outra do tipo corioalantoidiana, sendo este órgão do tipo hemocorial, labiríntico, que se apresenta histologicamente composto por lóbulos divididos em três regiões distintas: o centro do lóbulo, o labirinto e o interlóbulo. Na região do centro do lóbulo, verificou-se a presença de artérias e veias; e em sua região periférica estavam presentes dois sistemas tubulares arranjados de forma paralela, onde as lacunas sangüíneas e os capilares estavam em íntimo contato, formando a região do labirinto. O interlóbulo era composto de artérias e veias. O trofoblasto era o principal componente da placenta, que, independentemente da região onde se encontrava, mostrava-se de natureza sincicial. Ultra-estruturalmente a barreira placentária da paca foi classificada como hemomonocorial.

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It is a descriptive study with a qualitative approach, and an action-research type, which aimed to analyze the changes of knowledge about contraceptive methods invested to a teenager group attended in Igapó Family Healthcare Unit, in the city of Natal/RN, after consent and institutional assent of Ethics Committee of Rio Grande do Norte Federal University (Protocol No. 131/07). It were researched 16 teenagers of both sexes, with age ranging from 11 to 16 years. We used two structured questionnaires, one in the initial diagnosis and another during the seven meetings of the focus group, in addition to the field notes and the meetings discussions transcriptions. The data-collection was performed in the period of two months by a team composed by a nurse the research coordinator, a dentist, a nursing assistant, a community-based healthcare worker and a nursing academic. The quantitative and qualitative data were organized, tagged and categorized into spreadsheet in Microsoft Excel, being held a thematic analysis of speeches performed by the study participants. The results were presented as tables, graphics, photos, drawings and word clippings. The educational strategy developed in focus group allowed adolescents to discuss, exchange ideas and opinions on several contraceptive methods, providing expansion in knowledge of all contraceptives discussed, especially those natural and surgical, which were less mentioned at the beginning of the study. Among the advantages of the contraceptive methods listed by teenagers, was highlighted avoiding pregnancy and STDs in use of the barrier method of condom. As for the disadvantages more frequently noted by the survey with the misuse of barrier methods, was highlighted get pregnant, acquire STD's and do not prevent STD's in hormonal, natural and surgical methods. Adolescents showed consistency between the advantages and disadvantages and types of contraceptive methods, showing a widening in knowledge among them. It may be said that, in general, those surveyed had a good understanding about the use of the various contraceptive methods. Thus, the study participants had positively evaluated all the criteria used to qualify the meetings in the focus group. The action strategy of the focus group should be encouraged by professionals who work with teenagers, since they prefer to live in groups, one characteristic of adolescence.

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O objetivo deste trabalho foi avaliar a forma de ação de duas preparações de extrato pirolenhoso aplicadas diretamente sobre Brevipalpus phoenicis, que é o ácaro vetor da leprose dos citros, um dos principais problemas da citricultura Paulista. Para o experimento, foram utilizados ácaros adultos mantidos numa criação-estoque no laboratório de Acarologia da UNESP - Universidade Estadual Paulista, em Jaboticabal-SP. Os tratamentos foram constituídos por duas diferentes preparações (destilado e decantado) de extrato pirolenhoso de eucalipto nas proporções EP:água de 1:600; 1:300 (normalmente recomendadas); 1:150; 1:75; 1:38; 1:19 e de água (testemunha), com 7 repetições. Cada parcela foi constituída de 10 ácaros mantidos sobre um fruto de laranja, em arena de 2,5 cm de diâmetro, delimitada com cola adesiva tipo Tanglefoot®. As aplicações foram efetuadas em Torre de Potter, pulverizando-se 2 mL por fruto das soluções correspondentes aos diferentes tratamentos. Os frutos foram mantidos em sala climatizada a 27±1ºC, e as avaliações foram realizadas 24 e 48 horas após a aplicação dos tratamentos, determinando-se o número de ácaros mortos (mortalidade) e retidos na barreira adesiva (repelência). Os dois tipos de extrato pirolenhoso testados não apresentaram repelência significativa sobre Brevipalpus phoenicis; ambos induziram mortalidade significativa somente para concentrações acima de 1:150, com efeito mais pronunciado para o destilado; há um aumento na mortalidade de 24 para 48 horas após a aplicação; a ação protetora preconizada pela aplicação de baixas doses (1:300 a 1:600) nas plantas não é devida à mortalidade e repelência pelo contato direto do extrato pirolenhoso sobre os ácaros.

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Knowledge and innovation were seen as major forces, both for survival, as the acquisition of competitive advantages in the Brazilian economy, as well as adding value to the product as a market differentiator. The Triple Helix model is directed toward the knowledge-based economy. Over the past six years, the Federal Government through the Financier of Studies and Projects ( FINEP ) invested in technological innovation projects, economic subsidies, about U.S. $ 1 billion supporting more than 800 projects with these resources. According to the MCTI , the Northeast, over the years 2000 to 2010 increased spending on Science and Technology (considering the activities of research and development more scientific and related activities) of the State Government in relation to its total revenue In 2000, 0.51% of total revenues were invested in Science & Technology, while in 2010 this figure increased to 1.31%. Among the nine Northeast states, Paraíba is highlighted. In 2000, 0.33% of its total revenues were directed to innovation, reaching 2.04% in 2010, the largest increase in the region while the RN invested 0.24% in 2000 and in 2010 reached the level of 1.42 %. According to IBGE, in the period 2000-2011, the micro and small enterprises surpassed the barrier of 6 million establishments. In 2000, there were 4.2 million establishments while in 2011 were 6.3 million active establishments. Therefore, throughout the period, there was a creation of approximately 2.1 million new establishments. Between 2000 and 2011, micro and small businesses have created 7.0 million formal jobs, 8.6 million jobs in 2000 to 15.6 million in 2011. This scenario shows the importance of this study in relation to the investment of governments in RD & I in micro and small enterprises. This study aims to analyze the interaction Universities - Business - Government in the development of innovation in micro and small companies in Rio Grande do Norte participants of the edicts of Inova FAPERN. We chose to adopt as a research method case study concerning the procedure of the research, exploratory, descriptive, and on documents with engineers and researchers of innovation projects approved by PAPPE Subsidy (Inova -RN I, II and III). Data collection was done through the report made by FAPERN entitled: " Evaluation of companies financed and supported by the Grant Program for Technological Innovation for Micro and Small Enterprises RN - INOVA -RN " (2010) and a questionnaire with 40 closed questions and 1 opened to 30 affirmative composed based on a 5-point Likert scale. The analysis of data was qualitative and quantitative. The study provided to identify the importance and barriers arising from the relation between Government Enterprise (micro and small) and University as essential to the economic development of the region. It was also identified that, in the innovation projects, 70% of the goods or services originating from research were to market these, 50% resulted in a patent for the company and 80% publications of scientific articles

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The organic products represent one of the main trends of alimentary consumption in the new century. In Brazil, the answer is already well representative which it becomes the country, as a great consuming and exporting market of products of LVF type. The objective of this research was to investigate the factors capable to influence the food consumer in its purchase decision of organic products in the supermarkets of Teresina, capital of Piauí State. The methodology was exploratory and descriptive, using survey, with closed and opened questions in 542 interviewed. The questionnaire was based on projected scales to evaluate the factors that can influence the purchase decision of organic products, whose variable had been grouped in the following groups: behavior, knowledge, interest, competitiveness, importance, barrier and profile. The used statistical techniques were descriptive analysis and multiple regression analysis. The results demonstrate interest of the population in paying more for the organic product, due to better quality of life, however it lacks to one better spreading and greater sensitization to attract these consumers. Some recommendations and proposals are presented after the results, as suggestions for future research

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This work aims to present how the reconfigurable microstrip antennas and frequency selective surfaces can be used to operate at communication systems that require changing their operation frequency according to system requirements or environmental conditions. The main purpose is to present a reconfigurable circular microstrip antenna using a parasitic ring and a reconfigurable dipole frequency selective surface. Thereupon there are shown fundamental topics like microstrip antennas, PIN diodes and the fundamental theory of reconfigurable antennas and frequency selective surfaces. There are shown the simulations and measurements of the fabricated prototypes and it is done an analysis of some parameters like the bandwidth and radiation pattern, for the antennas, and the transmission characteristics, for the frequency selective surface. Copper strips were used in place of the diodes for proof of the reconfigurability concept

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Global Positioning System, or simply GPS, it is a radionavigation system developed by United States for military applications, but it becames very useful for civilian using. In the last decades Brazil has developed sounding rockets and today many projects to build micro and nanosatellites has appeared. This kind of vehicles named spacecrafts or high dynamic vehicles, can use GPS for its autonome location and trajectories controls. Despite of a huge number of GPS receivers available for civilian applications, they cannot used in high dynamic vehicles due environmental issues (vibrations, temperatures, etc.) or imposed dynamic working limits. Only a few nations have the technology to build GPS receivers for spacecrafts or high dynamic vehicles is available and they imposes rules who difficult the access to this receivers. This project intends to build a GPS receiver, to install them in a payload of a sounding rocket and data collecting to verify its correct operation when at the flight conditions. The inner software to this receiver was available in source code and it was tested in a software development platform named GPS Architect. Many organizations cooperated to support this project: AEB, UFRN, IAE, INPE e CLBI. After many phases: defining working conditions, choice and searching electronic, the making of the printed boards, assembling and assembling tests; the receiver was installed in a VS30 sounding rocket launched at Centro de Lançamento da Barreira do Inferno in Natal/RN. Despite of the fact the locations data from the receiver were collected only the first 70 seconds of flight, this data confirms the correct operation of the receiver by the comparison between its positioning data and the the trajectory data from CLBI s tracking radar named ADOUR