Numerical Simulations of Axisymmetric Flows in Astrophysics and their Visualization by a Video Movie

Numerical simulations of axisymmetric flow in four different astrophysical situations are performed, and their results are visualized by using a video movie. The situations considered are : 1) an accretion flow on to a gravitating compact object allowing maximum accrection ; 2) a jet formation in a flow past a gravitating rigid sphere ; 3) an interaction between a supersonic wind from a central object and a uniform supersonic incident flow ; 4) a wind bubble formed by spherical supersonic wind. The video tape of VHS/NTSC format is available from the author

Evolutional Launch Concept for Pico/Nano Satellite

As the capabilities (through standardization and modular design approaches) and users (from universities to research laboratories to private companies) of nanosatellites increase, there is a commensurate need for dedicated launch access to space. This paper reviews recent development efforts related to Nano-Launcher, an orbital payload launch service for nano and microsatellites (1-10 kg and 10-100 kg to orbit). The system uses mainly existing elements in combination, based upon existing solid stages (such as the SpaceSpike-1 and 2, stages evolved from the JAXA/ISAS S-520 solid rocket) along with existing air-launch aircraft (such as the F-104 and F-15). Nano-Launcher is deemed to have a lower development risk/cost and will be designed to be more responsive to nanosatellite customers than competing services. The program is being led by the authors with cooperation with Japan’s Ministry of Economy, Industry and Trade and Institute of Space (METI) and Space and Astronautical Science (ISAS) of JAXA. Key technologies currently being developed for the system include boost motor propulsion, non-pyrotechnic stage separation system, and lightweight and low-cost avionics. There is envisioned to be a breadth of Nano-Launcher payload delivery services available for suborbital and orbital customers utilizing different combinations of rocket stages and carrier aircraft