Beijing Institute of Spacecraft Environment Engineering

Beijing, China

Beijing Institute of Spacecraft Environment Engineering

Beijing, China
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Weiquan F.,Beijing Institute of Spacecraft Environment Engineering
Astrophysics and Space Science Proceedings | Year: 2017

Spacecraft Thermal control materials such as various paints, OSR, Al-Kapton etc. need to be tested before they are used in spacecraft. Space environment such as electron, proton and UV factors etc. in Geosynchronous Orbit (GEO) or Low Earth Orbit (LEO) have severe degradation effects of solar absorptance, etc. The Chinese standard GJB2502 includes test methods of spacecraft thermal control coatings and covers the measurement of solar absorptance and emissivity, atomic oxygen test, ultraviolet test, electron and proton test, thermal cycle test, combined irradiation test, aero-dynamical environment test, etc. This paper introduces the process and main features of the standard such as test condition, test sample and test facility, etc.. © Springer International Publishing AG 2017.


Shen Z.,Beijing Institute of Spacecraft Environment Engineering | Zhai X.,China Academy of Space Technology
Astrophysics and Space Science Proceedings | Year: 2017

Space environments and their effects have threatened the reliability and lifetime of spacecraft materials and structures. Besides flight tests, ground simulation tests are essential to evaluate the property degradation of spacecraft materials and structures. However, restricted by the technology, ground simulation cannot reproduce totally the space environments. Space environments and their effects are introduced firstly in this paper, and then a study on the effectiveness of ground simulation testing for spacecraft to imitate space environmental effects is reported, and some key problems and key technologies are analyzed. At last, some advices to improve the effectiveness of ground simulation testing are proposed. © Springer International Publishing AG 2017.


Shen Z.,Beijing Institute of Spacecraft Environment Engineering | Yan D.,Beijing Institute of Spacecraft Environment Engineering
Astrophysics and Space Science Proceedings | Year: 2017

Space station, during its projected extended stay in LEO, will encounter many environmental factors including energetic particles, ultraviolet radiation, atomic oxygen, and space debris and meteoroids, together with some induced environments such as contamination and discharging. Firstly, the synergistic effects of the above environments on space station are briefed in pairs. Then the synergistic effects from extravehicular space environments are studied one by one, including the interactions between energetic particles and solar electromagnetic irradiation, between atomic oxygen and ultraviolet radiation, between space debris and atomic oxygen, as well as the contamination induced by space factors and discharging. Thirdly, the synergistic effects inside the space station between microbes, temperature, humidity and gas circulation, micro vibration, residual radiation, space radiation and microgravity and so on are analyzed. Lastly, some recommendations and countermeasures against synergistic effects are proposed for improving the mechanism’s analysis, the simulation studies, the test methods, the forecasting techniques and the protection of space station. © Springer International Publishing AG 2017.


Ou X.,Fudan University | Ou X.,Beijing Institute of Spacecraft Environment Engineering | Wang H.,Fudan University | Fan F.,Fudan University | And 2 more authors.
Physical Review Letters | Year: 2015

Large magnetic anisotropy energy (MAE) is desirable and critical for nanoscale magnetic devices. Here, using ligand-field level diagrams and density functional calculations, we well explain the very recent discovery [I. G. Rau et al., Science 344, 988 (2014)] that an individual Co adatom on a MgO (001) surface has a large MAE of more than 60 meV. More importantly, we predict that a giant MAE up to 110 meV could be realized for Ru adatoms on MgO (001), and even more for the Os adatoms (208 meV). This is a joint effect of the special ligand field, orbital multiplet, and significant spin-orbit interaction, in the intermediate-spin state of the Ru or Os adatoms on top of the surface oxygens. The giant MAE could provide a route to atomic scale memory. © 2015 American Physical Society.


News Article | September 28, 2016
Site: www.materialstoday.com

A nitrogen-doped mesoporous carbon thin film acts as a high capacity, binder-free supercapacitor with a long cycling stability, according to research published in the journal Applied Materials Today. [P Hu et al., Appl. Mater. Today (2016) 5, 1-8; DOI: 10.1016/j.apmt.2016.08.001] Pan Hu and Xinsheng Peng of Zhejiang University, in Hangzhou and Donghui Meng, Guohua Ren, Rongxin Yan of Beijing Institute of Spacecraft Environment Engineering, China, explain how they could convert gelatin/copper hydroxide nanostrands into a composite film of gelatin/HKUST-1, which they could then carbonize to generate the free-standing composite films. These films have a high specific energy of 28.1 Watt hours per kilogram and a specific capacity of 316 Farads per gram at a current density of 0.5 Amps per gram. They also have a capacitance retention of almost 93% and degrade by a mere 0.00064% after 11000 charge-discharge cycles, the team reports. Porous carbons, with their high surface area to volume ratio have been the focus of much research for their potential applications in electronics, separation science and beyond. They can be generated by chemical vapour decomposition, laser ablation, chemical or physical activation, carbonization of polymer aerogels, carbide-derived carbon, as well as template procedures. Often, their production then requires an additional step to dope them with nitrogen. Simpler approaches to functional porous carbons, for development as electrodes or supercapacitors are keenly sought and as such Hu and colleagues have sidestepped the problem of low doping levels seen with earlier approaches. Instead of using post-treatment with ammonia gas, the team has demonstrated how starting with a nitrogen-rich carbon compound and the carbonizing the processed material gives them much higher nitrogen content and so potentially more powerful electrical phenomena in the resulting doped material. They previously suggested gelatin as a low-cost, abundant fibrous material having a high nitrogen content, by virtue of it being a protein, as a precursor for a doped mesoporous carbon. Early studies required harsh conditions to generate the mesoporous material, but this leads to powders that then require a non-electrochemical binder to hold the particles together in a solid block before use. The presence of the binder inhibits activity, so a binder-free approach would be better. The team's room temperature method generates active thin films rather than powders and so requires no binder to aggregate particles into a usable component for their supercapacitor. The team concedes that their thin films are no more electrochemically active than other carbon-based materials, it is their method that sets apart the products and opens the door to a cool and efficient fabrication of supercapacitor films. David Bradley blogs at Sciencebase Science Blog and tweets @sciencebase, he is author of the popular science book "Deceived Wisdom".


Gong Z.,Beijing Institute of Spacecraft Environment Engineering
Proceedings of the International Astronautical Congress, IAC | Year: 2015

Laser-driven flyer technique (LDFT) shows many advantages in simulating micro-space debris hypervelocity impacting effects. In this paper; some recent progresses in laser-driven flyer system for space debris hypervelocity impact simulations researches conducted in CAST were reviewed and introduced, including: 1) Theoretical analysis of flyer velocity is conducted based on Lawrence Model; 2) A new kind of velocity in-situ measurement technology is developed for laser-driven flyer system;3) Flyers were accelerated up to 9 knVs with good repeatability using two layers targets; 4) Hypervelocity impact experiments of micro-space debris on spacecraft surface materials were carried out, and the degradation laws of material functional performance were obtained; 5) Cumulative damage evaluation method is studied; 6) Diamond-like Carbon (DLC) film is employed to protect the optical materials against micro-spacc debris impact. At last, the new trend of laser-driven flyer hypervelocity impact research is addressed. Copyright © (2015) by International Astronautical Federation All rights reserved.


Patent
Beijing Institute of Spacecraft Environment Engineering | Date: 2015-04-01

A fuel-free spacecraft propelling system having an open-ended outer cylinder of a propelling device and an atomic oxygen collecting device is disclosed. The latter is arranged at the forwardly-propelled front end of the outer cylinder and is hermetically connected with an RF generating device and an ion cyclotron wave heating device through a magnetic confinement device. A spiral wave discharge oxygen plasma inlet and a spiral wave discharge oxygen plasma outlet in the ion cyclotron wave heating device are respectively provided with another magnetic confinement device. The propulsion of the invention does not need to carry the propellant, which greatly reduces the launch costs, enables a spacecraft to work on an orbit in the whole life circle work and is advantageous.


Patent
Beijing Institute of Spacecraft Environment Engineering | Date: 2013-05-07

A chemical-electromagnetic hybrid propeller with variable specific impulse. Fuel gas ejected out from a spraying tube of the chemical propeller through chemical propulsion enters an ionization chamber through a first magnetic mirror tube for ionization. The fuel gas after ionization is heated up by radio-frequency ion cyclotron waves in an ion cyclotron wave heating chamber so as to improve the kinetic energy. Then a second magnetic mirror tube is used, so that ions in the fuel gas after the ionization are heated up many times in a reciprocating manner between the magnetic mirror tubes, and ejected to generate forward propulsion force. By means of the propeller, the propulsion force and the specific impulse are greatly increased.


Patent
Beijing Institute of Spacecraft Environment Engineering | Date: 2013-05-07

A fuel-free spacecraft propelling system having an open-ended outer cylinder of a propelling device and an atomic oxygen collecting device is disclosed. The latter is arranged at the forwardly-propelled front end of the outer cylinder and is hermetically connected with an RF generating device and an ion cyclotron wave heating device through a magnetic confinement device. A spiral wave discharge oxygen plasma inlet and a spiral wave discharge oxygen plasma outlet in the ion cyclotron wave heating device are respectively provided with another magnetic confinement device. The propulsion of the invention does not need to carry the propellant, which greatly reduces the launch costs, and enables a spacecraft to advantageously have an increased orbit life over existing spacecraft systems.


Patent
Beijing Institute of Spacecraft Environment Engineering | Date: 2015-04-01

A chemical -electromagnetic hybrid propeller with variable specific impulse. Fuel gas ejected out from a spraying tube of the chemical propeller through chemical propulsion enters an ionization chamber through a first magnetic mirror tube for ionization. The fuel gas after ionization is heated up by radio-frequency ion cyclotron waves in an ion cyclotron wave heating chamber so as to improve the kinetic energy. Then a second magnetic mirror tube is used, so that ions in the fuel gas after the ionization are heated up many times in a reciprocating manner between the magnetic mirror tubes, and ejected to generate forward propulsion force. By means of the propeller, the propulsion force and the specific impulse are greatly increased.

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