An architecture and conceptual design for a robotically assembled, modular space telescope (RAMST) that enables extremely large space telescopes to be conceived is presented. The distinguishing features of the RAMST architecture compared with prior concepts include the use of a modular deployable structure, a general-purpose robot, and advanced metrology, with the option of formation flying. To...

two cases of hydatid cysts of the orbit causing unilateral exophthalmos are reported. diagnosis were suspected by means of computed tomography (ct) and confirmed at operation. ct changes are described and its value in diagnosis of this lesion particularly in the endemic areas is stressed.

Homoclinic bifurcation with one orbit flip, two inclination flips and resonance in the tangent directions of homoclinic orbit is considered. By studying the associated successor functions constructed from a local active coordinate system, we prove the existence of double 1-periodic orbit, 1-homoclinic orbit, and also some coexistence conditions of 1-periodic orbit and 1-homoclinic orbit.

Global Positioning System (GPS) orbital error can be minimized using precise satellite orbit. These orbits are calculated GPS measurements from ground CORS. The distribution of the CORS involved in orbit determination is important, especially case regional determination. A an product generated locally distributed network and expected to improve measurement region. Satellite Position Dilution Pr...

Real-time orbit and clock corrections to GPS broadcast ephemeris, in short broadcast corrections (BCs), have become available as International GNSS Service (IGS) products through the IGS Real-time Service (RTS) in 2013. The BCs are distributed via the Network Transport of RTCM by Internet Protocol (NTRIP) according to RTCM State Space Representation standards. When applying the BCs in real-time...

With the development of global navigation satellite system(GNSS), hourly ultra-rapid products GNSS are attracting more attention due to their low latency and high accuracy. A new strategy method was applied by Shanghai Astronomical Observatory (SHAO) Analysis Center (AC) international Monitoring Assessment Service (iGMAS) for generating 6-hourly 1-hourly products, which mainly include American ...

dynamic game theory is applied to analyze the timber market in northern iran as a duopsony. the nash equilibrium and the dynamic properties of the system based on marginal adjustments are determined. when timber is sold, the different mills use mixed strategies to give sealed bids. it is found that the decision probability combination of the different mills follow a special form of attractor an...

China first lunar probe satellite “Chang’E-1(CE-1)” was successfully launched on Oct.24th, 2007 and reached the lunar polar working orbit with 200km altitude from lunar surface on Nov.7th . CE-1 satellite had been working normally during more than one year life time and has collected huge scientific data and images. Chang’E-1 microwave sounder (CELMS) is a four-frequency microwave radiometer. T...

Taiji-1 is the first technology demonstration satellite of Taiji Program in Space, which, served as pre-PathFinder mission, had finished its nominal science operational phase and successfully accomplished mission goal. The gravitational reference sensor (GRS) on-board one key payloads that coupled strongly to other instruments, sub-systems also platform itself. Fluctuations physical environment...