Rational connectedness and bound-edness of Fano manifolds
Rational connectedness and bound-edness of Fano manifolds
复制标题
Fano流形的有理连通性和有界性
DOI：
10.4310/jdg/1214453188
复制
发表时间：
1992
影响因子：
0.8
通讯作者：
S. Mori
中科院分区：
文献类型：
--
作者：
J. Kollár;Y. Miyaoka;S. Mori
一种数字定时系统，用于记录多个定时功能并以数字形式显示这些功能。高频晶体控制振荡器提供定时脉冲，该定时脉冲被馈送到脉冲速率分频器电路，该分频器电路以不同的时间速率提供多个输出。分频器电路的每个输出被馈送到单独的计数器电路，该计数器电路对脉冲进行计数以记录指定的定时函数。数字显示电路可切换地连接在每个计数器电路的输出之间，以单独地显示记录在每个计数器中的时间，而不干扰计数器的连续计数。计数器之一的输出与可变比较电路进行比较，该可变比较电路可以在预定时间范围内预置。当计数器的输出等于比较器中的预设时间时，产生一个信号，该信号将复位计数器并启动超时计数。
A digital timing system for recording a plurality of timing functions and displaying these functions in digital form. A high-frequency crystal control oscillator provides timing pulses which are fed to a pulse rate divider circuit which provides a plurality of outputs at different time rates. Each of the outputs of the divider circuit are fed to an individual counter circuit which counts the pulses to record a specified timing function. A digital display circuit is switchably connected between the outputs of each of the counter circuits to individually display the time recorded in each counter without disturbing the continued counting of the counters. The output of one of the counters is compared with a variable comparative circuit which can be preset over a range of predetermined times. When the output of the counter is equal to the preset time in the comparator, a signal is produced which will reset the counter and initiate an overtime count.