一种应用于卫星通信的间接时间同步方法

针对卫星扩频通信系统的时间同步需求,提出一种基于GNSS授时的卫星通信前向链路间接时间同步方法。通过由星地自发自收链路与锁相环构成的钟差间接修正环路,对发送端码时钟进行闭环修正。这将使前向链路信号起始扩频码相位在到达接收端的时刻与卫星导航授时模块输出的1 PPS保持精确稳定的同步。实现了不需要位同步的扩频信号定时接收。分析并得到间接时间同步误差表达式及其与环路带宽的变化关系,给出使同步误差最小的最优环路带宽值。星地链路试验结果表明时间同步误差随环路带宽的变化关系与理论分析一致,最佳环路带宽对应的钟差间接修正环路秒脉冲1σ同步误差约为20 ns,验证了本方法的有效性。在此同步误差条件下,接收端成功地进行扩频伪码的同步和电文解调,实现了卫星导航授时对通信的辅助。     

聚苯硫醚及其应用

介绍聚苯硫醚的特性及其主要制备方法，对聚苯硫醚的应用进行了综述，并对其在造纸工业上应用作了展望。     

V_2O_3与Te、PPS复合物的制备及其电性异常研究

用固态反应法和低温焙烧法制备(V_(1-x)Tex)_2O_3与PPS复合材料,在77～400K温区内测量其电阻率和介电常数与温度关系。结果表明,在Te与PPS同时存在的条件下,除了160K附近的反铁磁绝缘-顺磁金属转变之外,发现了在210K附近的电性异常,用偶极矩浓度讨论了所得的结果.     

基于CPLD的IRIG-B(AC)时间码解调器研制

介绍了一种基于CPLD的IRIG-B(AC)码解调电路设计。该IRIG-B(AC)码解调电路具有实时秒脉冲和时、分、秒时间信息并行输出等功能。具有硬件电路和软件编程简单,AC码解调精度高,灵活度和稳定性高,可以方便的进行电路移植,是一种成功的IRIG-B(AC)时间码解调方案。     

Measuring procrastination: Psychometric properties of the Norwegian versions of the Irrational Procrastination Scale (IPS) and the Pure Procrastination Scale (PPS)

Procrastination has been defined in different ways. Two instruments—the Irrational Procrastination Scale (IPS) and the Pure Procrastination Scale (PPS)—focus on a core problem in procrastination—the irrational delay of intended behavior. The present paper examined the psychometric properties of the Norwegian translations of these scales. In five samples with students as well as non-students (aggregated n?=?1045), standard psychometric properties of the instruments were assessed and their factor structures were compared in replication analyses. In addition, correlations between the instruments as well as other instruments (i.e., the Susceptibility to Temptation Scale and the Satisfaction with Life Scale) were examined to determine convergent and divergent validity. Overall, the results indicated that both IPS and PPS are suitable for use as measures of procrastination.