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Author: Erik M. Conway
Publisher: JHU Press
ISBN: 1421416050
Category : Science
Languages : en
Pages : 417
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Book Description
Getting to Mars required engineering genius, scientific strategy, and the drive to persevere in the face of failure. Although the Jet Propulsion Laboratory in Pasadena, California, has become synonymous with the United States’ planetary exploration during the past half century, its most recent focus has been on Mars. Beginning in the 1990s and continuing through the Mars Phoenix mission of 2007, JPL led the way in engineering an impressive, rapidly evolving succession of Mars orbiters and landers, including roving robotic vehicles whose successful deployment onto the Martian surface posed some of the most complicated technical problems in space flight history. In Exploration and Engineering, Erik M. Conway reveals how JPL engineers’ creative technological feats led to major breakthroughs in Mars exploration. He takes readers into the heart of the lab’s problem-solving approach and management structure, where talented scientists grappled with technical challenges while also coping, not always successfully, with funding shortfalls, unrealistic schedules, and managerial turmoil. Conway, JPL’s historian, offers an insider’s perspective into the changing goals of Mars exploration, the ways in which sophisticated computer simulations drove the design process, and the remarkable evolution of landing technologies over a thirty-year period.
Author: George Winfred Hervey
Publisher:
ISBN:
Category : Baptists
Languages : en
Pages : 888
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Book Description
Author: Erik M. Conway
Publisher: JHU Press
ISBN: 1421416050
Category : Science
Languages : en
Pages : 417
Get Book Here
Book Description
Getting to Mars required engineering genius, scientific strategy, and the drive to persevere in the face of failure. Although the Jet Propulsion Laboratory in Pasadena, California, has become synonymous with the United States’ planetary exploration during the past half century, its most recent focus has been on Mars. Beginning in the 1990s and continuing through the Mars Phoenix mission of 2007, JPL led the way in engineering an impressive, rapidly evolving succession of Mars orbiters and landers, including roving robotic vehicles whose successful deployment onto the Martian surface posed some of the most complicated technical problems in space flight history. In Exploration and Engineering, Erik M. Conway reveals how JPL engineers’ creative technological feats led to major breakthroughs in Mars exploration. He takes readers into the heart of the lab’s problem-solving approach and management structure, where talented scientists grappled with technical challenges while also coping, not always successfully, with funding shortfalls, unrealistic schedules, and managerial turmoil. Conway, JPL’s historian, offers an insider’s perspective into the changing goals of Mars exploration, the ways in which sophisticated computer simulations drove the design process, and the remarkable evolution of landing technologies over a thirty-year period.
Author: Robert Zubrin
Publisher: American Astronautical Society
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 396
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Book Description
Author: KRISHNENDU SEKHAR DASPATNAIK
Publisher: Blue Rose Publishers
ISBN:
Category : Biography & Autobiography
Languages : en
Pages : 660
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Book Description
One of the greatest of seers, an apex personality in the history of mankind who ascended to the crest of the universal forces to eliminate the poignancy of human ignorance on earth. He made a God’s Labour with great adventure to free man from the shackles of the iron rules of imposed destiny. He had to make a supreme sacrifice to change the destiny of mankind by rendering his own earthly body as a base for the descent of the highest Truth, Power, Light, Force and Consciousness onto the earth for a luminous future of mankind. He fulfilled his ultimate dream of liberating humanity from the vicious circle of ignorance and inconscience. The Saviour of mankind is none other than Sri Aurobindo, who has achieved all for humanity and charted the pathway for humanity to a delightful, glorious New World and New divine Race.... In the upheaval of humanity’s evolutionary journey, Sri Aurobindo has explored and prepared a path for mankind leading to a world of Beauty and Love. We must follow that path to find that divine life where there would be no disease, decay, death, or destruction. Life would no longer be a confusion and chaos, a struggle for basic survival; there would be no quarrels, fighting, competition; there would be no war, accidents, calamities; there would be no more selfishness, ego-eccentric attitudes, ingratitude, inhumanity, cruelty, poverty, suffering or pain; there would be no medical emergencies, heinous killing and murder, barbarism, vandalism....
Author: Patrick Michel
Publisher: University of Arizona Press
ISBN: 0816532133
Category : Science
Languages : en
Pages : 946
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Book Description
"More than forty chapters detail our current astronomical, compositional, geological, and geophysical knowledge of asteroids, as well as their unique physical processes and interrelationships with comets and meteorites"--Provided by publisher.
Author: Fiedler, Klaus
Publisher: Mzuni Press
ISBN: 9996060462
Category : Religion
Languages : en
Pages : 525
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Book Description
It was not the European and American churches which evangelised Africa, but the mission societies. The missions from the Great Awakening such as the London Missionary Society and Church Missionary Society, or the Holy Ghost Fathers and the White Fathers, which started the process of Sub-Saharan Africa becoming a Christian continent are well known and documented. Less known, and less documented are the interdenominational faith missions which began in 1873 with the aim of visiting the still unreached areas of Africa: North Africa, the Sudan Belt and the Congo Basin. Missions such as the Africa Inland Mission or Sudan Interior Mission gave birth to some of the big churches like ECWA in Nigeria and Africa Inland Church in Kenya. It is the aim of this book to describe faith missions and their theology and to present an overview of the early development of faith missions insofar as they touched Africa.
Author: United States. National Aeronautics and Space Administration. Office of Exploration
Publisher:
ISBN:
Category : Astronautics and state
Languages : en
Pages : 56
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Book Description
Author: James D. Ryan
Publisher: Routledge
ISBN: 1351881590
Category : History
Languages : en
Pages : 414
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Book Description
During the thirteenth and fourteenth centuries religious zeal nourished by the mendicants’ sense of purpose motivated Dominican and Franciscan friars to venture far beyond Europe’s cultural frontiers to spread their Christian faith into the farthest reaches of Asia. Their incredible journeys were reminiscent of heroic missionary ventures in earlier eras and far more exotic than evangelization during the tenth through twelfth centuries, when the western church Christianized Eastern Europe and Scandinavia. This new mission effort was stimulated by a variety of factors and facilitated by the establishment of the Mongol Empire, and, as the fourteenth century dawned, missionaries entertained fervent but vain hopes of success within khanates in China, Central Asia, Persia and Kipchak. The reports these missionaries sent back to Europe have fascinated successive generations of historians who analyzed their travels and struggled to understand their motives and aspirations. The essays selected for this volume, drawn from a range of twentieth-century historians and contextualized in the introduction, provide a comprehensive overview of missionary efforts in Asia, and of the developments in the secular world that both made them possible and encouraged the missionaries’ hopes for success. Three of the studies have been translated from French specially for publication in this volume.
Author: Samuel Abraham Walker
Publisher: BoD – Books on Demand
ISBN: 3368878980
Category : Fiction
Languages : en
Pages : 602
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Book Description
Reprint of the original, first published in 1845.
Author: Weiß, Sascha
Publisher: Universitätsverlag der TU Berlin
ISBN: 3798332320
Category : Technology & Engineering
Languages : en
Pages : 256
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Book Description
This thesis investigates the use of GNSS receivers on 1U CubeSats, using the example of BEESAT-4 and BEESAT-9. The integration of such a device on satellites enables highly precise time synchronization, position acquisition and orbit determination and prediction The application fields that depend on an accurate attitude control and orbit determination system and can also be processed by CubeSats are highlighted. Therefore the state of the art of GNSS receivers is described, which are suitable for the use on satellites and could be integrated into 1U CubeSats. Further on it is investigated which subsystems of a small satellite are particularly affected and what the special challenges are to realize a precise positioning with a GNSS receiver. In addition, some developments are presented that have significantly increased the performance of 1U CubeSats in recent years. The system concept of BEESAT satellites is introduced and the evolution of the payload board including the use of the latest sensor technologies for attitude control is described. It is shown how the verification of the satellite's subsystems was performed on the ground, with the focus on testing and simulating the attitude control and the GNSS receiver. The necessary integration steps, the calibration and environmental test campaign are discussed. Both satellites were successfully operated and the results of the on-orbit experiments are presented. It is shown how a three-axis stabilized attitude control was first verified on BEESAT-4 and then a GNSS receiver was successfully operated on BEESAT-9 for more than one year. In addition, the inter-satellite link between BEESAT-4 and BIROS will be analyzed, since it is essential for the relative navigation of satellites. The acquired navigation data was sent to the ground and the identification of BEESAT-9 was carried out using this data. A qualitative analysis of the orbital elements (TLE) of BEESAT-9 was performed systematically due to a daily operation of the GNSS receiver. Furthermore, it was investigated how a small GNSS antenna affects the received signal strength from GNSS satellites and whether this antenna or its amplifier degrades over time. Additionally, an orbit determination and propagation based on the navigation data could be performed and the results are evaluated. The analyzed questions allow a statement about the continuous use of GNSS receivers on 1U CubeSats and if it is necessary to achieve the mission objectives. Diese Arbeit untersucht den Einsatz von GNSS-Empfängern auf 1U CubeSats am Beispiel von BEESAT-4 und BEESAT-9. Das Integrieren einer solchen Komponente auf Satelliten ermöglicht eine hochgenaue Zeitsynchronisation, Positions- und Orbitbestimmung sowie deren Vorhersage Es werden die Anwendungsfelder beleuchtet, die auf ein akkurates Lageregelungs- und Orbitbestimmungssystem angewiesen sind und außerdem auch von CubeSats bearbeitet werden können. Dazu wird der Stand der Technik von GNSS-Empfängern beschrieben, die für den Einsatz auf Satelliten geeignet sind und von ihren Eigenschaften auch auf 1U CubeSats integriert werden könnten. Weitergehend wird untersucht, welche Subsysteme eines Kleinstsatelliten besonders betroffen sind und was die speziellen Herausforderungen sind, um eine präzise Positionsbestimmung mithilfe eines GNSS-Empfängers zu realisieren. Dazu werden auch einige Entwicklungen vorgestellt, die in den letzten Jahren die Leistungsfähigkeit von 1U CubeSats signifikant erhöht haben. Das Systemkonzept der BEESAT Satelliten wird eingeführt und die Evolution der Nutzlastplatine inklusive der Verwendung der jeweils neuesten Sensortechnologien für die Lageregelung beschrieben. Es wird gezeigt wie die Verifikation der Subsysteme des Satelliten am Boden erfolgte, wobei der Fokus auf dem Testen und Simulieren der Lageregelung und dem GNSS-Empfänger liegt. Dazu werden die notwendigen Integrationsschritte, die Kalibrations- und die Umwelttestkampagne diskutiert. Beide Satelliten wurden erfolgreich betrieben und die Ergebnisse der on-orbit Experimente werden vorgestellt. Es wird gezeigt wie zunächst eine dreiachsenstabilisierte Lageregelung auf BEESAT-4 verifiziert und anschließend auf BEESAT-9 über mehr als ein Jahr ein GNSS-Empfänger erfolgreich betrieben wurde. Zusätzlich wird der Intersatelliten Link zwischen BEESAT-4 und BIROS analysiert, da dieser für die Relativnavigation von Satelliten essentiell ist. Die akquirierten Navigationsdaten wurden zum Boden gesendet und die Identifizierung von BEESAT-9 erfolgte mithilfe dieser Daten. Eine qualitative Analyse der Orbitelemente (TLE) von BEESAT-9 konnte systematisch durchgeführt werden durch einen täglichen Einsatz des GNSS-Empfängers. Weiterhin wurde erforscht wie sich eine kleine GNSS-Antenne auf die empfangenen Signalstärken der GNSS Satelliten auswirkt und ob diese Antenne oder ihr Verstärker mit der Zeit degradieren. Zusätzlich konnte eine Orbitbestimmung und -propagation auf Basis der Navigationsdaten durchgeführt und die Ergebnisse ausgewertet werden. Die analysierten Fragestellungen erlauben eine Aussage über den durchgängigen Einsatz von GNSS-Empfängern auf 1U CubeSats und ob dieser notwendig ist um die Missionsziele zu erreichen.
