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UNOSAT (satellite)
UNOSAT was a Brazilian scientific applications nanosatellite, designed, developed, built and tested by researchers and students working at the Northern Paraná University. Features The primary objective of UNOSAT was to transmit voice messages and a telemetry data packet in AX25 protocol. The UNOSAT scientific satellite had the following characteristics: Inovação Tecnológica. 30 April 2003. Retrieved 03 April 2017. General * Format: parallelepiped with 46 cm x 25 cm x 8.5 cm * Mass: * Orbit: heliosynchronous * Stabilization: by rotation at 120 rpm * Precision: 1 degree * Altitude:Payload The instrumentation shipped in UNOSAT w ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers. The remaining 29% of Earth's surface is land, consisting of continents and islands. Earth's surface layer is formed of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's liquid outer core generates the magnetic field that shapes the magnetosphere of the Earth, deflecting destructive solar winds. The atmosphere of the Earth consists mostly of nitrogen and oxygen. Greenhouse gases in the atmosphere like carbon dioxide (CO2) trap a part of the energy from the Sun close to the surface. Water vapor is widely present in the atmosphere and forms clouds that cover most of the planet. More solar e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Institute For Space Research
The National Institute for Space Research ( pt, Instituto Nacional de Pesquisas Espaciais, INPE) is a research unit of the Brazilian Ministry of Science, Technology and Innovations, the main goals of which are fostering scientific research and technological applications and qualifying personnel in the fields of space and atmospheric sciences, space engineering, and space technology. While INPE is the civilian research center for aerospace activities, the Brazilian Air Force's General Command for Aerospace Technology is the military arm. INPE is located in the city of São José dos Campos, São Paulo. History On August 13, 1961, President Jânio Quadros signed a decree which created the Organizing Group for the National Commission on Space Activities (COGNAE). This group would give rise to the current National Institute for Space Research. COGNAE, which shortly after became known as CNAE, started its activities by stimulating, coordinating and supporting studies on space rel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universidade Norte Do Paraná
University North of Paraná or Universidade Norte do Paraná is a private university which was created by federal decree number 70592. Administrative infrastructure includes a rectory Londrina, Brazil, pro-rectories and university council. It has campuses in the cities of Londrina, Arapongas and Bandeirantes and was credentialed to distance learning modality in July 2002, and currently possess 424 classrooms used for support in cities spread for all Brazil states. Undergraduate programs *26 undergraduate courses *10 sequential courses Graduate Courses (latu sensu) *50 specialization courses Graduate Courses (stricto sensu) *Master's degree in Odontology Dentistry, also known as dental medicine and oral medicine, is the branch of medicine focused on the teeth, gums, and mouth. It consists of the study, diagnosis, prevention, management, and treatment of diseases, disorders, and conditions o ... External links *http://www.unopar.br/ *http://www.unoparvirtual.com.br/ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
VLS-1 V03
The 2003 Alcântara VLS accident was an accident during the Brazilian Space Agency's third attempt to launch the VLS-1 rocket, which was intended to launch two satellites into orbit. The rocket ignited on its launch pad at the Alcântara Launch Center, killing 21 people. Background The rocket, proposed in 1979 had until the accident two launch attempts: one in 1997, which ended up in the Atlantic Ocean due to the failure of one of the first stage engines to start and another in 1999, destroyed remotely due to a flame penetrating the top of the second stage block 3 minutes after takeoff. Operation São Luís Besides being the third flight of the VLS-1, the operation had as objectives the launch of the satellites UNOSAT and SATEC in to orbit; verify the CLA's ability to perform type launches and the use of the CLBI as a tracking station. The transportation of materials for V03 started on August 23, 2002 and stopped on April 16, 2003. The operation was restarted on July 1, an insp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcântara Launch Center
Alcantara, Alcântara (Portuguese), Alcántara (Spanish), Alcàntara, Alcàntera, El-Qantarah and (El) Kantara are all transliterations of the Arabic word ''al qantara'' (القنطرة), meaning "the bridge". Alcantara may refer to: People * Alcantara (surname) Places Algeria * El Kantara, town and commune in Biskra province * El Kantara District, in Biskra province Brazil * Alcântara, Maranhão, city in the state of Maranhão ** Alcântara Launch Center, Maranhão, satellite launch center * Alcântara River, Rio de Janeiro state * Barra d'Alcântara, municipality in the state of Piauí * Dom Pedro de Alcântara, municipality in the state Rio Grande do Sul * São Pedro de Alcântara, Santa Catarina, municipality Chile * The area near Alcántara metro station in northeastern Santiago Cyprus * Kantara Castle, in the Kyrenia mountains Egypt * El-Qantarah el-Sharqiyya, city in the governorate of Shamal Sina, on the eastern side of the Suez Canal Italy * Alcantara (river) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geocentric Orbit
A geocentric orbit or Earth orbit involves any object orbiting Earth, such as the Moon or artificial satellites. In 1997, NASA estimated there were approximately 2,465 artificial satellite payloads orbiting Earth and 6,216 pieces of space debris as tracked by the Goddard Space Flight Center. More than 16,291 objects previously launched have undergone orbital decay and entered Earth's atmosphere. A spacecraft enters orbit when its centripetal acceleration due to gravity is less than or equal to the centrifugal acceleration due to the horizontal component of its velocity. For a low Earth orbit, this velocity is about ; by contrast, the fastest crewed airplane speed ever achieved (excluding speeds achieved by deorbiting spacecraft) was in 1967 by the North American X-15. The energy required to reach Earth orbital velocity at an altitude of is about 36 MJ/kg, which is six times the energy needed merely to climb to the corresponding altitude. Spacecraft with a perigee belo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low Earth Orbit
A low Earth orbit (LEO) is an orbit around Earth with a period of 128 minutes or less (making at least 11.25 orbits per day) and an eccentricity less than 0.25. Most of the artificial objects in outer space are in LEO, with an altitude never more than about one-third of the radius of Earth. The term ''LEO region'' is also used for the area of space below an altitude of (about one-third of Earth's radius). Objects in orbits that pass through this zone, even if they have an apogee further out or are sub-orbital, are carefully tracked since they present a collision risk to the many LEO satellites. All crewed space stations to date have been within LEO. From 1968 to 1972, the Apollo program's lunar missions sent humans beyond LEO. Since the end of the Apollo program, no human spaceflights have been beyond LEO. Defining characteristics A wide variety of sources define LEO in terms of altitude. The altitude of an object in an elliptic orbit can vary significantly along the orbit. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanosatellite
A small satellite, miniaturized satellite, or smallsat is a satellite of low mass and size, usually under . While all such satellites can be referred to as "small", different classifications are used to categorize them based on mass. Satellites can be built small to reduce the large economic cost of launch vehicles and the costs associated with construction. Miniature satellites, especially in large numbers, may be more useful than fewer, larger ones for some purposes – for example, gathering of scientific data and radio relay. Technical challenges in the construction of small satellites may include the lack of sufficient power storage or of room for a propulsion system. Rationales One rationale for miniaturizing satellites is to reduce the cost; heavier satellites require larger rockets with greater thrust that also have greater cost to finance. In contrast, smaller and lighter satellites require smaller and cheaper launch vehicles and can sometimes be launched in multipl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AX25
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks. AX.25 v2.0 and later occupies the data link layer, the second layer of the OSI model. It is responsible for establishing link-layer connections, transferring data encapsulated in frames between nodes, and detecting errors introduced by the communications channel. As AX.25 is a pre-OSI-model protocol, the original specification was not written to cleanly separate into OSI layers. This was rectified with version 2.0 (1984), which assumes compliance with OSI level 2. AX.25 v2.2 (1998) added improvements to improve efficiency, especially at higher data rates. Stations can automatically negotiate payload sizes larger than the previous limitation of 256 bytes. Extended sequence numbers (7 vs. 3 bits) allow a larger window size, the number of frames that can be sen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers. The remaining 29% of Earth's surface is land, consisting of continents and islands. Earth's surface layer is formed of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's liquid outer core generates the magnetic field that shapes the magnetosphere of the Earth, deflecting destructive solar winds. The atmosphere of the Earth consists mostly of nitrogen and oxygen. Greenhouse gases in the atmosphere like carbon dioxide (CO2) trap a part of the energy from the Sun close to the surface. Water vapor is widely present in the atmosphere and forms clouds that cover most of the planet. More solar e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telemetry
Telemetry is the in situ data collection, collection of measurements or other data at remote points and their automatic data transmission, transmission to receiving equipment (telecommunication) for monitoring. The word is derived from the Greek language, Greek roots ''tele'', "remote", and ''metron'', "measure". Systems that need external instructions and data to operate require the counterpart of telemetry, telecommand. Although the term commonly refers to wireless data transfer mechanisms (e.g., using radio, ultrasonic, or Infrared#Communications, infrared systems), it also encompasses data transferred over other media such as a telephone or computer network, optical link or other wired communications like power line carriers. Many modern telemetry systems take advantage of the low cost and ubiquity of GSM networks by using SMS to receive and transmit telemetry data. A ''telemeter'' is a physical device used in telemetry. It consists of a sensor, a transmission path, and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voltage
Voltage, also known as electric pressure, electric tension, or (electric) potential difference, is the difference in electric potential between two points. In a static electric field, it corresponds to the work needed per unit of charge to move a test charge between the two points. In the International System of Units, the derived unit for voltage is named ''volt''. The voltage between points can be caused by the build-up of electric charge (e.g., a capacitor), and from an electromotive force (e.g., electromagnetic induction in generator, inductors, and transformers). On a macroscopic scale, a potential difference can be caused by electrochemical processes (e.g., cells and batteries), the pressure-induced piezoelectric effect, and the thermoelectric effect. A voltmeter can be used to measure the voltage between two points in a system. Often a common reference potential such as the ground of the system is used as one of the points. A voltage can represent either a source ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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