This paper presents a scheme of modifying the existing two-station Chinese VLBI Network correlator of Shanghai Astronomical Ohservatory to a multi-format compatible one. In order to process the Mark IV tapes, as well as the VLBA tapes with the data speed up to 1Gbit/s, we must upgrade the high-speed & high-density tape recorders, add one headstack, mount the new precise thin tape reading outfit, and expand the data recovery system and the FFT engines.
介绍了在上海天文台现有两台站VLBA型VLBI相关处理机的基础上同时处理多制式磁带的研究方案.为适应 Mark IV薄磁带,并兼顾 1Gbit/s的 VLBA格式,需升级现有处理机的高速高密度磁带机,增加磁头组,更换精密薄带读取机构;
But the drive software of these devices equipped in PC only supports the fixed tape file format, and lack of the software and hardware documents, it is difficult to use these devices efficiently and to exchange information.
In the light of the data streaming tape device used by microcomputers generally, this paper will comprehensively reports on the basic I/O procedures included in a new drive software package. The user's program can conveniently call this software package to read and write the arbitrary tape data format.
Experiments [1, 2] have revealed a transition accompanied by an appreciable enhancement of pulsations whose period is twice that of the driving vibrating tape.
Results are given of experimental investigations of heat transfer under conditions of forced convection of highly subcooled water in a smooth pipe and with an internal twisted tape under asymmetric heating.
The technique for measuring distortions is described, and the results of measurements are presented for several films cut from different sections of a standard piece of double-sided tape with a length of ~7 m and a useable width of ~20 cm.
The standard plastic base of the tape under investigation is 190 μm thick; ~50-μm-thick layers of diluted PX3 emulsion-gel are applied to its opposite sides.
The photoelectric micrometer and the automatic observation are tested on the Bamberg transit (D=90mm f=900mm). The photoelectric tracking micrometer is composed of photoelectric detector and servomechanism, It can bisect and track the star image. With instructions on the punched paper tape, it can control the mechanical transmission of motion, reverse the horizontal axis, point the telescope at the correct zenith distance, and determine the velocity of the servomechanism in tracking the motion of each...
The FITS formate on magnetic tape is briefly introduced and all the details of the FITS specifications relevant to the data obtained with the No.1 CCD system of the Yunnan Observatory are also discussed in this present article.
A method is introduced for reading out the files in a foreign magnetic tape volume indirectly in terms of a code file dumped from the tape by the DUMP utility or command. This method can be applyed to those volumes which could not be read directly by means of the PIP, FLX, BRU, copy utilities or commands, since it starts with the code files. But the only prerequisite is that the hardwares should be compatible.