1,721,472 research outputs found
ALDEBARAN: A "SYSTEM" DEMONSTRATOR PROJECT FOR NEW GENERATIONS OF SPACE TRANSPORTATION, NOW ENTERING IN THE PHASE A.
No full textAldebaran is the name chosen for a "system" demonstrator project which paves the way for one or more
next-generation launch vehicle targets.
The proposed demonstrator comes at a time when it is planned to operate existing European launch
vehicles (ARIANE 5, Soyuz, VEGA) until around 2025, with in parallel preparations activities for the
development of a new generation launcher. The project is aiming at developing a flight demonstrator by
focusing certain activities involved in the preparation of future launch vehicles. The first launch may take
place around 2015. It would represent a major contribution to the development of a new-generation
launch vehicle.
Several Aldebaran concepts have already been analysed in the “phase 0” during 2008. A selection process
have been applied taking into account the benefit of the proposed new technologies for the future launch
systems, but also the interest of the partners for instance by taking advantage of research activities already
foreseen. An other important selection criteria was the global development cost until the first
technological flight. The result of this “phase 0” selection process will be explained.
Three concepts have been retained for the “phase A”:
- An airborne solution launched from a military aircraft which will allow to build a dual stages
expendable “system” demonstrator, involving the main technological innovations in the frame of the solid
propulsion (first stage with new propellants), the liquid propulsion (upper stage with methane), the
structures and materials, the avionics and more globally: the “system” activities. The work foreseen in
phase A will not only focus on general studies for system and propulsion, but it will also concentrate on
some first technological sub-system demonstration tests.
- As a first alternative, an airdropped concept, launched from a cargo aircraft, is kept. It will mainly
be studied regarding safety and operational aspects in addition with the “extraction” phase when the
demonstrator is airdropped from the cargo bay, and has to be ignited at a safe distance from the aircraft.
The technologies involved in this concept are identical to the previous ones.
- As a second alternative, a “more conventional” vertical ground lift-off type of expendable solution
is retained. The idea is to push as far as possible the technological choices for a “very low cost” launch
system, the propellant choices remaining “open”. As for the airborne solution, general studies and subsystem
demonstration tests will be addressed during the phase A.
The paper will present the result of the “phase 0” concepts selection process held in 2008. And it will
show some of the first technological choices and demonstrations envisaged for the phase A of Aldebaran
Aldebaran: A "System" Demonstrator Project for new Generations of Space Transportation
No full textAldebaran is the name chosen for a "System" demonstrator project which paves the way for one or more next-generation launch vehicle targets and is also specified to be able to realize operational launches. The project takes its name from the brightest star in the Taurus constellation. The proposed demonstrator comes at a time when it is planned to operate existing European launch vehicles (ARIANE 5, Soyuz, VEGA) until around 2025, with no new generation launcher under development before 2015. The project is aiming at developing a flight demonstrator by focusing certain activities involved in the preparation of future launch vehicles. The first launch shall take place around 2014. It would represent an intermediate step prior to the development of a new-generation launch vehicle. The demonstrator shall also be capable of carrying out launch missions for micro- satellites to serve a market niche not covered by existing European launch vehicles. It will be developed in the frame of international co operations. Several possible Aldebaran concepts are under analyses. The paper will present the main Functional Performance Specifications of Aldebaran. Some illustrations of
possible concepts will be shown
Fat Liberation Manifesto: November 1973
Full text linkThe Fat Liberation Manifesto, originally written in 1973, by Judy Freespirit and Aldebaran
Aldebaran, sorta soje
No full textRešenjem Komisije za priznavanje sorti Ministarstva poljoprivrede, šumarstva i vodoprivrede Republike Srbije broj 320-04-3546/2/2022-11 od 29.04.2024. godine priznata je sorta soje Aldebaran
Studi analisis metode penentuan arah kiblat menggunakan Azimuth bintang Aldebaran
Full text linkPada masa sekarang, penentuan arah kiblat tidak hanya menggunakan Matahari atau Bulan, bintang pun bisa dijadikan penentu arah kiblat asalkan mengetahui azimuth bintang tersebut. Penentuan arah kiblat menggunakan bintang sama halnya dengan penentuan arah kiblat menggunakan matahari, yaitu dengan alat yang sama serta data dari benda langit yang menjadi titik acuan untuk selanjutnya dimasukkan kedalam rumus segitiga bola. Salah satunya adalah bintang Aldebaran yang terdapat dalam rasi bintang Taurus. Bintang Aldebaran bisa dijadikan sebagai alternatif penentu arah kiblat di malam hari. Berdasarkan dari uraian di atas, penulis tertarik untuk mencoba meneliti dan menganalisis bintang Aldebaran sebagai penentu arah kiblat serta akurasinya.
Penelitian ini dimaksudkan untuk mengetahui bagaimana metode penentuan arah kiblat menggunakan azimuth bintang Aldebaran dan bagaiamana pula tingkat keakurasian metode penentuan arah kiblat menggunakan bintang Aldebaran.
Penelitian ini termasuk penelitian lapangan (field research) yang termasuk kedalam penelitian kualitatif. Data primernya diambil dari hasil observasi di lapangan. Data sekunder diperoleh dari buku Almanak Nautika atau dari aplikasi Nautical Almanac serta dari studi dokumen-dokumen berupa buku-buku seputar arah kiblat sebagai pendukung dari data primer. Metode pengumpulan datanya dilakukan dengan cara observasi dan dokumentasi, sedangkan metode analisisnya menggunakan analisis komparatif yang bertujuan untuk menguji keakuratan suatu metode baru dalam menentukan arah kiblat menggunakan azimuth bintang Aldebaran dan membandingkannya dengan metode azimuth Matahari.
Penelitian ini menghasilkan dua temuan. Pertama, Penentuan arah kiblat metode azimuth bintang Aldebaran dapat dijadikan sebagai alternatif pengukuran arah kiblat di malam hari dengan menggunakan alat bantu Theodolite. Kedua, penentuan arah kiblat menggunakan metode azimuth bintang Aldebaran cukup akurat, dikarenakan bintang mempunyai cahaya yang berupa satu titik sehingga memudahkan dalam membidiknya dan pengamat dapat memastikan bahwa titik tersebut berada di tengah-tengah lensa teropong
Potential Early Applications of Advanced Effusion Cooled Ceramic Combustion Chambers
No full textTechnologies for porous effusion or transpiration cooled ceramic combustion chambers are under investi-gation at DLR since a couple of years. Research concentrates on applying transpiration cooling to C/C liners as a candidate technology to fulfill the requirements of future cryogenic (LOX/LH2) liquid rocket engines, taking advantage of interesting features of C/C liners such as low weight as well as potentially increased reliability and life time of the rocket engine. A fully ceramic combustion chamber including noz-zle is currently foreseen to be testfired in early 2011 (see Figure 1!).
The question when and in which application a ceramic combustion chamber can first be used in a launcher propulsion system becomes now more imminent. The introduction of this new technology in any existing relatively large European launch vehicle like Vega or Ariane without prior successful space flight application is unlikely. A first potential future use of the effusion cooled engine is more likely in a com-pletely new vehicle of smaller size.
DLR has investigated a few design options of upper stages with low thrust (up to 10 kN) ceramic engine with hydrogen and oxygen propellants. Some of these types investigated in the multi-national study Aldé-baran [1] or in a technology assessment together with Astrium for the German space agency [2] are de-scribed in this paper
Recent advances in understanding the extracellular calcium-sensing receptor
No full textThe extracellular calcium-sensing receptor (CaR), a ubiquitous class C G-protein-coupled receptor (GPCR), is responsible for the control of calcium homeostasis in body fluids. It integrates information about external Ca and a surfeit of other endogenous ligands into multiple intracellular signals, but how is this achieved? This review will focus on some of the exciting concepts in CaR signaling and pharmacology that have emerged in the last few years
Aldebaran b's Temperate Past Uncovered in Planet Search Data
No full textThe nearby red giant Aldebaran is known to host a gas giant planetary companion from decades of ground-based spectroscopic radial velocity measurements. Using Gaussian Process-based Continuous Auto-Regressive Moving Average models, we show that these historic data also contain evidence of acoustic oscillations in the star itself, and verify this result with further dedicated ground-based spectroscopy using the SONG telescope and space-based photometry with the Kepler Space Telescope. From the frequency of these oscillations we determine the mass of Aldebaran to be 1.16 ±0.07, and note that this implies its planet will have been subject to insolation comparable to the Earth for some of the star's main sequence lifetime. Our approach to sparse, irregularly sampled time series astronomical observations has the potential to unlock asteroseismic measurements for thousands of stars in archival data, and push to lower-mass planets around red giant stars
Stellarium software and the occultation of Aldebaran observed by Copernicus
Full text linkInternational audienceHere we propose an example of the use of Stellarium software for simulating a phenomenon of 1497, the lunar occultation of Aldebaran observed by Nicolaus Copernicus. We will also use CalSKY for the phase of the moon
Coal as a source rock for hydrocarbon gas in the Aldebaran Sandstone, Denison Trough, Bowen Basin - geochemical evidence
No full textThe Early Permian Aldebaran Sandstone is the main hydrocarbon reservoir in the Denison Trough. Contained hydrocarbon gas has a wet gas index (C/C - C) of between 0.87 and 0.97 (N=10), and constituent methane has δC values ranging from -51.5 to -36.2‰ (N=10). These values clearly indicate that the gas is thermogenic rather than biogenic. The methane δC values are anomalously low, with typical values for humic methane present in natural gas formed at similar maturity levels significantly higher at -26 ± 5‰. This suggests that, in addition to disseminated organic matter in underlying marine mudrocks of the Cattle Creek Formation, methane substantially more depleted in C was derived from coal seams of the Reids Dome beds, a thick coal measure sequence which underlies the Cattle Creek Formation and, in the south, the Aldebaran Sandstone. The presence of co-existing, isotopically heavy CO in the Glentulloch and Merivale Fields is consistent with the view that natural gas in the Aldebaran Sandstone is in part coal seam derived. -from Author
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