The document lists 28 references related to electric propulsion and space propulsion technologies. The references are from a variety of sources including NASA technical reports, conference proceedings, online news articles, and websites. The references cover topics such as ion thrusters, Hall effect thrusters, pulsed plasma thrusters, FEEP thrusters, and other advanced electric propulsion technologies being researched and developed for spacecraft propulsion applications.
This document is a Haiku Deck presentation that provides examples of photos credited to various photographers. It encourages the viewer to create their own Haiku Deck presentation on SlideShare and provides a link to get started. The presentation contains photos from 15 different photographers covering topics like climate research, government, education, and space.
Ease Leads to Exposure, Exposure Leads to AdoptionDawn Wright
The document discusses how ease of access to data and tools leads to greater exposure, which in turn leads to increased adoption. It provides examples of dashboards and data access tools created by ESRI and its partners that make earth observation data and analytics more accessible. Maintaining findable, accessible, interoperable and reusable (FAIR) principles as well as ensuring reproducibility and reliability of analyses is important for maximizing the value and trust in scientific data and tools.
The document discusses ion thrusters, which are electrically powered spacecraft propulsion systems that use ions to generate thrust. Ion thrusters work by ionizing propellant, accelerating the ions using electric fields, and then neutralizing the ion beam. They have characteristics like high specific impulse but low spacecraft acceleration. The document provides details on the mechanisms and operation of ion thrusters, and notes their importance for space navigation, where development and testing are ongoing.
This document discusses non-chemical propulsion systems as alternatives to traditional chemical rocket propulsion. It describes several types of non-chemical propulsion including electric propulsion technologies like resistojets, arcjets, ion thrusters, and hall thrusters. Thermal propulsion options are also presented, such as solar thermal and nuclear thermal. Solar sails that use photon pressure from sunlight for propulsion are also covered. The advantages of these non-chemical propulsion systems are highlighted, such as requiring less propellant, producing continuous low thrust, and being more fuel efficient than chemical rockets.
ION THRUSTERS (an application of plasma physics) pptBhushith Kumar
Plasma has lured the attention of physicists towards itself for quite some time now. 99% of the universe is made up of plasma. It is the purest form of raw and intense energy which possesses all the types of matter known to mankind. Scientists have come up with various theories and technologies to harness this versatile source of energy. The “plasma propulsion” is a technology which harnesses plasma to achieve vehicular propulsion, mostly spacecrafts. This technology is gaining importance due to the depletion of conventional sources of energy such as fossil fuels which are used to fuel vehicles for transportation. This paper showcases the ideology of plasma and its types. Further, this article also deals with the types of plasma propulsion systems, their architecture, working, pros and cons, and the types of propellants used in ion thrusters. This paper also houses a brief description of various missions which have incorporated ion thrusters. And towards the fag end of this article, a vision of “terrestrial transportation” has also been idealized followed by the list of references.
This document discusses electric rocket propulsion systems. It describes how electric rockets use electrical energy rather than chemical reactions to provide thrust. There are several types of electric propulsion, including ion/plasma drives, electrostatic drives, electrothermal drives, and electromagnetic drives. Each type accelerates charged particles in different ways using electric and magnetic fields to generate thrust. While electric propulsion provides weaker thrust than chemical rockets, it can maintain a low thrust for extended durations, making it useful for satellite propulsion applications.
This document is a Haiku Deck presentation that provides examples of photos credited to various photographers. It encourages the viewer to create their own Haiku Deck presentation on SlideShare and provides a link to get started. The presentation contains photos from 15 different photographers covering topics like climate research, government, education, and space.
Ease Leads to Exposure, Exposure Leads to AdoptionDawn Wright
The document discusses how ease of access to data and tools leads to greater exposure, which in turn leads to increased adoption. It provides examples of dashboards and data access tools created by ESRI and its partners that make earth observation data and analytics more accessible. Maintaining findable, accessible, interoperable and reusable (FAIR) principles as well as ensuring reproducibility and reliability of analyses is important for maximizing the value and trust in scientific data and tools.
The document discusses ion thrusters, which are electrically powered spacecraft propulsion systems that use ions to generate thrust. Ion thrusters work by ionizing propellant, accelerating the ions using electric fields, and then neutralizing the ion beam. They have characteristics like high specific impulse but low spacecraft acceleration. The document provides details on the mechanisms and operation of ion thrusters, and notes their importance for space navigation, where development and testing are ongoing.
This document discusses non-chemical propulsion systems as alternatives to traditional chemical rocket propulsion. It describes several types of non-chemical propulsion including electric propulsion technologies like resistojets, arcjets, ion thrusters, and hall thrusters. Thermal propulsion options are also presented, such as solar thermal and nuclear thermal. Solar sails that use photon pressure from sunlight for propulsion are also covered. The advantages of these non-chemical propulsion systems are highlighted, such as requiring less propellant, producing continuous low thrust, and being more fuel efficient than chemical rockets.
ION THRUSTERS (an application of plasma physics) pptBhushith Kumar
Plasma has lured the attention of physicists towards itself for quite some time now. 99% of the universe is made up of plasma. It is the purest form of raw and intense energy which possesses all the types of matter known to mankind. Scientists have come up with various theories and technologies to harness this versatile source of energy. The “plasma propulsion” is a technology which harnesses plasma to achieve vehicular propulsion, mostly spacecrafts. This technology is gaining importance due to the depletion of conventional sources of energy such as fossil fuels which are used to fuel vehicles for transportation. This paper showcases the ideology of plasma and its types. Further, this article also deals with the types of plasma propulsion systems, their architecture, working, pros and cons, and the types of propellants used in ion thrusters. This paper also houses a brief description of various missions which have incorporated ion thrusters. And towards the fag end of this article, a vision of “terrestrial transportation” has also been idealized followed by the list of references.
This document discusses electric rocket propulsion systems. It describes how electric rockets use electrical energy rather than chemical reactions to provide thrust. There are several types of electric propulsion, including ion/plasma drives, electrostatic drives, electrothermal drives, and electromagnetic drives. Each type accelerates charged particles in different ways using electric and magnetic fields to generate thrust. While electric propulsion provides weaker thrust than chemical rockets, it can maintain a low thrust for extended durations, making it useful for satellite propulsion applications.
13 interesting ways to Support Spelling in the Classroomdouglasgreig
The document provides 13 suggestions for supporting spelling instruction in the classroom, including using online tools like Spelling City, grouping words by roots, playing concentration games, using interactive whiteboards for flashcard activities, highlighting difficult parts of words, mixing up practice methods, and using technology like Pivot and SMART Response systems. It encourages sharing additional ideas and tips for vocabulary development, spelling, and handwriting activities.
Madagascar is an island nation off the southeastern coast of Africa known for producing fair trade hats. Research found Madagascar already makes a variety of fair trade hats, so an example hat was chosen to represent the country. The document lists categories related to Madagascar imports such as food, stationary, uniforms and advertising.
The document summarizes the Named Entity Extraction and Linking (NEEL) challenge held at WWW2015. The NEEL challenge aimed to explore new approaches for recognizing and linking named entities in microposts (short social media posts). 21 teams participated in the challenge involving recognizing named entities and linking them to entries in the DBpedia knowledge base. The winning team, Ousia, achieved an overall score of 0.8067 by accurately recognizing and linking named entities in tweets.
Pertemuan Abbas dengan Hillary gagal mencapai kesepakatan untuk melanjutkan pembicaraan perdamaian Israel-Palestina karena Israel menolak untuk menghentikan pembangunan permukiman di Tepi Barat dan Yerusalem Timur. Abdullah mengundurkan diri dari pemilihan ulang presiden Afghanistan karena menilai hasil pemilu sebelumnya dipengaruhi curang. Sebelas orang tewas akibat kecelakaan kereta api di India ketika kereta menabrak truk.
Komnas HAM akan mengkaji lebih lanjut sengketa lahan antara warga di tiga kecamatan di Tapanuli Tengah dengan PT Nauli Sawit. Sengketa ini telah menjadi permasalahan kompleks yang sulit diselesaikan. Komnas HAM berjanji akan menyelesaikan masalah ini tanpa kerugian pihak manapun.
Human hair serves important biological functions. It helps regulate body temperature by trapping an insulating layer of air and absorbing radiation. The large surface area of hair on the head suggests it performs a critical function. While hair was once thought lifeless, it is actually alive and connected to the brain, as cutting it triggers regrowth. Hair should not be considered a burden and cutting it places unnecessary stress on the body.
Hypothetical MFI: First MicroFinanceBank Afghanistandwueger
Created as a final project for a Johns Hopkins School for Advanced International Studies (SAIS) course on Microfinance and Development. Task was to create a new microfinance institution. Summer 2008.
1. Presiden menyatakan operasi khusus seperti penembakan misterius (petrus) tidak boleh digunakan untuk menangani ancaman keamanan dalam negeri dan tidak boleh terjadi penyimpangan seperti kasus Munir.
2. Dosen Universitas Negeri Medan dihukum 3 tahun 6 bulan penjara karena terlibat demo anarki menuntut provinsi Tapanuli yang menewaskan ketua DPRD. Dua mahasiswa juga dihukum penjara karena ter
Tiga kalimat ringkasan:
1. Topan Ketsana menewaskan sedikitnya 11 orang dan mencederai 29 lainnya di Kamboja, dengan ratusan rumah hancur.
2. Pemimpin Korea Utara Kim Jong-il berjanji akan memperkuat hubungan dengan China dalam pesan selamat ulang tahun ke-60 Republik Rakyat China.
3. Rancangan undang-undang di Senat AS akan mengharuskan badan penerbangan menggunakan pesawat dan me
The document is a presentation by Tim Richardson on employee engagement and empowerment. Some key points from the presentation include:
1) People think in different ways ("Jud" vs "Generator" thinking styles) and barriers that prevent peak performance should be removed.
2) Employees should be treated with respect and given second chances, while also teaching life skills.
3) Community service benefits employees through leadership development and enrichment, and attracts new employees by showing a company's commitment to its community.
[Infographic] Online Sales Rev Up in the Automotive AftermarketKathy McCoy, MBA
Online sales for the automotive aftermarket are growing blazingly fast. See what's driving that growth and make sure you're getting your share in our new infographic.
Pemerintah Indonesia berencana mengembangkan industri halal untuk meningkatkan ekspor dan pariwisata. Beberapa langkah yang akan dilakukan antara lain mempromosikan produk halal ke pasar global, meningkatkan sertifikasi produk halal, serta melatih SDM agar mampu bersaing di industri halal.
This document describes an experiment to develop a laser-based method for retrieving assets and humans in space. The experiment tested different low-cost propellant materials to generate thrust by controlled laser ablation. Carbon nanofoam and ammonium carbonate samples were tested as propellants in a 3D-printed ablation chamber connected to a force sensor under vacuum conditions. The carbon nanofoam generated a measurable thrust response. Future work will refine the experimental setup to allow for testing and comparison of additional propellant materials.
This study examines a reservoir of ionized gas in the galactic halo that can sustain star formation in the Milky Way. The authors detect a substantial amount of warm-hot gas in the halo of a star-forming galaxy at z=0.2 through detection of Ne VIII absorption lines. This warm-hot gas reservoir contains as much mass as the galaxy's stars and can replenish its supply of cool gas to sustain star formation over billions of years.
This document summarizes the agenda and presentations for the November 9, 1999 NIAC Fellows Meeting. It includes an introduction by Dr. Robert Cassanova on transportation infrastructure from ground to air to space. The agenda then lists status reports from NIAC grant recipients on advanced concepts in various areas such as spacecraft propulsion, aeronautics, astronomy, and exploration. Related NIAC grants are also listed to show the connections between projects.
13 interesting ways to Support Spelling in the Classroomdouglasgreig
The document provides 13 suggestions for supporting spelling instruction in the classroom, including using online tools like Spelling City, grouping words by roots, playing concentration games, using interactive whiteboards for flashcard activities, highlighting difficult parts of words, mixing up practice methods, and using technology like Pivot and SMART Response systems. It encourages sharing additional ideas and tips for vocabulary development, spelling, and handwriting activities.
Madagascar is an island nation off the southeastern coast of Africa known for producing fair trade hats. Research found Madagascar already makes a variety of fair trade hats, so an example hat was chosen to represent the country. The document lists categories related to Madagascar imports such as food, stationary, uniforms and advertising.
The document summarizes the Named Entity Extraction and Linking (NEEL) challenge held at WWW2015. The NEEL challenge aimed to explore new approaches for recognizing and linking named entities in microposts (short social media posts). 21 teams participated in the challenge involving recognizing named entities and linking them to entries in the DBpedia knowledge base. The winning team, Ousia, achieved an overall score of 0.8067 by accurately recognizing and linking named entities in tweets.
Pertemuan Abbas dengan Hillary gagal mencapai kesepakatan untuk melanjutkan pembicaraan perdamaian Israel-Palestina karena Israel menolak untuk menghentikan pembangunan permukiman di Tepi Barat dan Yerusalem Timur. Abdullah mengundurkan diri dari pemilihan ulang presiden Afghanistan karena menilai hasil pemilu sebelumnya dipengaruhi curang. Sebelas orang tewas akibat kecelakaan kereta api di India ketika kereta menabrak truk.
Komnas HAM akan mengkaji lebih lanjut sengketa lahan antara warga di tiga kecamatan di Tapanuli Tengah dengan PT Nauli Sawit. Sengketa ini telah menjadi permasalahan kompleks yang sulit diselesaikan. Komnas HAM berjanji akan menyelesaikan masalah ini tanpa kerugian pihak manapun.
Human hair serves important biological functions. It helps regulate body temperature by trapping an insulating layer of air and absorbing radiation. The large surface area of hair on the head suggests it performs a critical function. While hair was once thought lifeless, it is actually alive and connected to the brain, as cutting it triggers regrowth. Hair should not be considered a burden and cutting it places unnecessary stress on the body.
Hypothetical MFI: First MicroFinanceBank Afghanistandwueger
Created as a final project for a Johns Hopkins School for Advanced International Studies (SAIS) course on Microfinance and Development. Task was to create a new microfinance institution. Summer 2008.
1. Presiden menyatakan operasi khusus seperti penembakan misterius (petrus) tidak boleh digunakan untuk menangani ancaman keamanan dalam negeri dan tidak boleh terjadi penyimpangan seperti kasus Munir.
2. Dosen Universitas Negeri Medan dihukum 3 tahun 6 bulan penjara karena terlibat demo anarki menuntut provinsi Tapanuli yang menewaskan ketua DPRD. Dua mahasiswa juga dihukum penjara karena ter
Tiga kalimat ringkasan:
1. Topan Ketsana menewaskan sedikitnya 11 orang dan mencederai 29 lainnya di Kamboja, dengan ratusan rumah hancur.
2. Pemimpin Korea Utara Kim Jong-il berjanji akan memperkuat hubungan dengan China dalam pesan selamat ulang tahun ke-60 Republik Rakyat China.
3. Rancangan undang-undang di Senat AS akan mengharuskan badan penerbangan menggunakan pesawat dan me
The document is a presentation by Tim Richardson on employee engagement and empowerment. Some key points from the presentation include:
1) People think in different ways ("Jud" vs "Generator" thinking styles) and barriers that prevent peak performance should be removed.
2) Employees should be treated with respect and given second chances, while also teaching life skills.
3) Community service benefits employees through leadership development and enrichment, and attracts new employees by showing a company's commitment to its community.
[Infographic] Online Sales Rev Up in the Automotive AftermarketKathy McCoy, MBA
Online sales for the automotive aftermarket are growing blazingly fast. See what's driving that growth and make sure you're getting your share in our new infographic.
Pemerintah Indonesia berencana mengembangkan industri halal untuk meningkatkan ekspor dan pariwisata. Beberapa langkah yang akan dilakukan antara lain mempromosikan produk halal ke pasar global, meningkatkan sertifikasi produk halal, serta melatih SDM agar mampu bersaing di industri halal.
This document describes an experiment to develop a laser-based method for retrieving assets and humans in space. The experiment tested different low-cost propellant materials to generate thrust by controlled laser ablation. Carbon nanofoam and ammonium carbonate samples were tested as propellants in a 3D-printed ablation chamber connected to a force sensor under vacuum conditions. The carbon nanofoam generated a measurable thrust response. Future work will refine the experimental setup to allow for testing and comparison of additional propellant materials.
This study examines a reservoir of ionized gas in the galactic halo that can sustain star formation in the Milky Way. The authors detect a substantial amount of warm-hot gas in the halo of a star-forming galaxy at z=0.2 through detection of Ne VIII absorption lines. This warm-hot gas reservoir contains as much mass as the galaxy's stars and can replenish its supply of cool gas to sustain star formation over billions of years.
This document summarizes the agenda and presentations for the November 9, 1999 NIAC Fellows Meeting. It includes an introduction by Dr. Robert Cassanova on transportation infrastructure from ground to air to space. The agenda then lists status reports from NIAC grant recipients on advanced concepts in various areas such as spacecraft propulsion, aeronautics, astronomy, and exploration. Related NIAC grants are also listed to show the connections between projects.
Robert B. Friedfeld is an Associate Professor in the Department of Physics & Astronomy at Stephen F. Austin State University. He received his BS in Physics from Seton Hall University and his MS and PhD in Physics from Florida Institute of Technology. His research interests include materials science, thin film deposition, and scanning probe microscopy. He has established a Thin Films and Microscopy Laboratory at SFASU where he conducts research with undergraduate students on topics such as carbon nanotubes and cellulose fibers.
PAUT Inspection Simulation of Welds at NASAejnovick
Use of CIVA NDT simulation software to assist in planning a weld inspection. This article includes a comparison between simulated and experimental results.
The gravity field_and_interior_structure_of_enceladusSérgio Sacani
The gravity field and interior structure of Enceladus were determined using Doppler data from three Cassini flybys. There is a negative mass anomaly in the south polar region, largely compensated by a positive subsurface anomaly consistent with a regional subsurface sea at depths of 30-40 km extending to 50° south latitude. Enceladus deviates mildly from hydrostatic equilibrium, with estimated quadrupole coefficients indicating a differentiated body with a low-density core.
The gravity fieldandinteriorstructureofenceladusGOASA
The Cassini spacecraft measured Enceladus' gravity field during three flybys. The results indicate a negative mass anomaly over the south pole, likely compensated by a subsurface sea of water 30-40 km deep extending to 50° south latitude. Analysis of the gravity data suggests Enceladus has differentiated into a low-density core with a moment of inertia around 0.335 times its mass times the square of its radius, consistent with the presence of liquid water beneath the surface. The endogenic heat output and gravity data are best explained by models involving tidal heating of Enceladus' interior through past or current orbital resonances.
Presentation by Jim Chilton (Vice President and Program Manager, Exploration Launch Systems, Boeing) at the Von Braun Memorial Symposium in Huntsville, Alabama, 22 October 2008.
<a href="http://astronautical.org/vonbraun/vonbraun-2008/session5">http://astronautical.org/vonbraun/vonbraun-2008/session5</a>
This document lists over 50 technical publications by Kenneth D. Mahrer, Ph.D., organized into three sections: Technical Publications, Publications on Technical Writing and Presenting, and Non-Technical Publications. The technical publications section lists numerous journal articles, conference presentations, reports, and patents on topics related to hydraulic fracturing, microseismic monitoring, induced seismicity, and geophysical methods from 1989 to 2016.
Zul Dhanji_profile of service_V3_1_May 10 2016Zul Dhanji
Zul N. Dhanji has over 35 years of experience in aerospace engineering and safety roles for NASA and other government agencies. Some of his roles and projects include:
- Working on NASA's Space Shuttle program from 1978 to 2007, including roles supporting the Canadarm1 robotic arm.
- Providing engineering support for the International Space Station from 1999 to 2004, including assembly support and training astronauts.
- Contributing to NASA's Mars Phoenix mission in 2005 and the James Webb Space Telescope from 2007 to 2016.
- Gaining experience in the private sector working on aircraft, satellites, missiles and other projects for companies like Hughes Aircraft, FMC, Litton, and Smiths Aerospace
This document outlines a technical seminar presentation on asteroid mining and its potential future applications in space science. The presentation discusses the growing economic demand for resources in space, important asteroid compositions and their accessible materials, considerations for asteroid trajectories and mining technologies. It provides an example case study of a potential mission to asteroid 1996 FG3, comparing net present value calculations for extracting water versus other resources. The conclusion discusses next steps around characterizing asteroid compositions, developing specialized mining technologies, optimizing trajectories and evaluating the space economy and resource demands.
Reference Guide To The International Space StationSérgio Sacani
The International Space Station is a unique place – a convergence of science, technology and human innovation that demonstrates new technologies and makes research breakthroughs not possible on Earth.
It is a microgravity laboratory in which an international crew of six people live and work while traveling at a speed of five miles per second, orbiting Earth every 90 minutes.
The space station has been continuously occupied since November 2000. In that time, more than 200 people from 15 countries have visited.
Crew members spend about 35 hours each week conducting research in many disciplines to advance scientific knowledge in Earth, space, physical, and biological sciences for the benefit of people living on our home planet.
The station facilitates the growth of a robust commercial market in low-Earth orbit, operating as a national laboratory for scientific research and facilitating the development of U.S. commercial cargo and commercial crew space transportation capabilities.
More than an acre of solar arrays provide power to the station, and also make it the next brightest object in the night sky after the moon. You don’t even need a telescope to see it zoom over your house. And we’ll even send you a text message or email alert to let you know when (and where) to look up, spot the station, and wave!
The study examines a post-starburst galaxy outflow using ultraviolet spectroscopy of multiple ions including hydrogen. It finds the outflow extends at least 160,000 light-years from the galaxy and contains a hidden mass of at least 6x10^9 times the mass of our Sun. This challenges previous assumptions about the extent and mass of galaxy outflows, suggesting they may play a larger role in regulating galaxy evolution than thought.
This document provides biographical and professional information about Dr. Gerald Bryan Cleaver, including his educational background, academic positions, research interests, publications, honors, and employers of his graduate students. It outlines his extensive experience as a professor, researcher, author, and leader in physics and cosmology over his 30+ year career.
This document outlines a study exploring space radiation and its effects on biological matter. It describes the types of space radiation, the AE-8 and AP-8 radiation belt models from NASA, and simulation tools MULASSIS and Geant4. The document presents results from simulations of electron beam interactions with silicon and water samples of varying thicknesses. It concludes that exponential energy spectra have severe dose deposition effects and discusses further areas of investigation.
This document summarizes the proceedings of the 3rd annual meeting of the NASA Institute for Advanced Concepts (NIAC) held on June 5-6, 2001 at NASA Ames Research Center. It provides an overview of proposals received and awards given by NIAC, as well as summaries of the status reports presented on innovative advanced aerospace concepts. The status reports covered concepts such as a space elevator, robotic planetary explorers, very large space telescopes, and in-situ resource utilization for Mars missions. Keynote speakers discussed visions for the future of aeronautics and space.
The document outlines plans for a manned mission to Mars that would launch in 2033. It details the spacecraft design including living quarters and command module dimensions. A landing site in Charitum Montes is proposed due to protection from storms and potential for scientific research. Propulsion systems including Falcon 9 Heavy, Ares V rockets, and a VASIMR plasma rocket are discussed. The total estimated cost is $10.5 billion and the mission involves 5 launches to transport the 29,610 kg payload.
The document provides an overview of NASA Ames Research Center, including its history, missions, programs, facilities, and educational activities. It notes that NASA Ames conducts applied research and develops critical technologies to enable NASA missions. Some key areas of focus include space, Earth, and life sciences; astrobiology; small satellites; aviation and aeronautics; exploration systems; and educational outreach. It also summarizes several past and current NASA Ames missions.
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performances No. ESA SP-555). Wilmington, DE: Elwing Company.
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Ohio: NASA.
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(HiPEP) ion thruster No. TM-2004-213194). Glenn Research Center, Cleveland,
Ohio: NASA.
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Brook Park, Ohio: NASA.
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status and potential applications. Turin, Italy: 48th International Astronautical
Federation Congress.
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satellites and constellations with FEEP thrusters No. IEPC-97-188). Cleveland, OH:
Proceedings of the 25th Electric Propulsion Conference.
Marrese-Reading, C., Polk, J., Mueller, J., & Owens, A. (2001). In-FEEP thruster ion
beam neutralization with thermionic and field emission cathodes No. IEPC-01-290).
Pasadena, CA: 27th International Electric Propulsion Conference.
Mikellides, P. G. (2003). Pulsed inductive thruster (PIT): Modeling and validation using
the MACH2 code No. CR-2003-212714). Arizona State University, Tempe, Arizona:
NASA.
Nowicki, A. (1999). Earth-to-orbit transportation. Retrieved December 10, 2006, from
http://www.nas.nasa.gov/About/Education/SpaceSettlement/Nowicki/SPBI101.HTM
Oleson, S. R., & Sankovic, J. M. (2001). Advanced hall electric propulsion for future in-
space transportation No. NASA/TM-2001-210676). Cleveland, Ohio: Glenn
Research Center.
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xenon thruster No. TM-2002-211892)NASA.
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