Spin-exchange relaxation of naturally abundant Rb in a K-Rb-~(21)Ne self-compensated atomic comagnetometer

The total effective spin-exchange relaxation of naturally abundant Rb in a K–Rb–21Ne comagnetometer is analyzed,and the results show that the coexistence of 87Rb and 85Rb isotopes in the same volume can lead to a large extra spinexchange broadening compared to pure 87Rb.This broadening mainly comes from the contribution of the equivalent reduction in the Rb spin-exchange rate.On this basis,an approximate relaxation model is proposed and experimentally demonstrated to be more accurate than that from a previous work.This study also provides a method for determining the properties of alkali-metal vapor cells.     

基于Java的网络编程及多线程同步机制

介绍Java的网络编程基础，说明了线程的几个状态间的相互转换，对Java的多线程的同步机制和线程间通信机制作了分析，并结合创建一个远程文件服务器的实例，来探讨Java的网络编程对多线程同步机制的支持。     

A dual-axis,high-sensitivity atomic magnetometer

Atomic magnetometer(AM) operated in a spin-exchange relaxation-free(SERF) regime features superior sensitivity and non-cryogenic operation, and thus is competitive with the best superconducting quantum interference devices.Previously, SERF AM with f T/Hz~(1/2) level sensitivity commonly acted as a single-axis sensor. Here we demonstrate a dual-axis SERF AM capable of simultaneously and independently detecting x-and y-field components with a sensitivity of 20 f T/Hz~(1/2). As there is no necessity to worry about the cross-talk effects arising from field modulations, the dual-axis scheme proposed here is of particular interest to AM array and hence the biomagnetic applications.