低功率单轴超声驻波悬浮原理与实验实现

现有单轴式超声驻波悬浮由于未考虑超声振子的最优电声转化效率,通常需要辅助专门的功率放大器才能实现大功率声悬浮。本研究发展了一套利用交流阻抗法测定超声谐振子最佳工作频率的方法,并利用普通的声速测定仪,将超声谐振腔的共振频率与超声振子的谐振频率相匹配,实现了功率放大器不参与的毫瓦量级的两波节超声悬浮,为低功率超声悬浮的实现提供了新方案。

牢牢把握思想政治教育的辩证法

习主席在学校思想政治理论课教师座谈会上强调指出:“推动思想政治理论课改革创新,要不断增强思政课的思想性、理论性和亲和力、针对性。”并提出了坚持政治性和学理性相统一、坚持价值性和知识性相统一、坚持建设性和批判性相统一,坚持理论性和实践性相统一、坚持统一性和多样性相统一、坚持主导性和主体性相统一、坚持灌输性和启发性相统一、坚持显性教育与隐性教育相统一的“八个相统一”指导原则。

Manipulation of nonreciprocal unconventional photon blockade in a cavity-driven system composed of an asymmetrical cavity and two atoms with weak dipole–dipole interaction

We present a work of manipulating collective unconventional photon blockade(UCPB)and nonreciprocal UCPB(NUCPB)in a cavity-driven system composed of an asymmetrical single-mode cavity and two interacting identical twolevel atoms(TLAs).When the atoms do not interact directly,the frequency and intensity restrictions of collective UCPB can be specified,and a giant NUCPB exists due to the splitting of optimal atom–cavity coupling strength in proper parameter regime.However,if a weak atom–atom interaction which provides a new and feeble quantum interference pathway to UCPB is taken into account,two restrictions of UCPB are combined complexly,which are rigorous to be matched simultaneously.Due to the push-and-pull effect induced by weak dipole–dipole interaction,the UCPB regime is compressed more or less.NUCPB is improved as a higher contrast is present when the two complex UCPB restrictions are matched,while it is suppressed when the restrictions are mismatched.In general,whether NUCPB is suppressed or promoted depends on its working parameters.Our findings show a prospective access to produce giant quantum nonreciprocity by a couple of weakly interacting atoms.

落实《纲要》要谋求“神”“形”统一

新修订的《军队基层建设纲要》对领导机关抓基层提出了“五个坚持”的总体要求，为旅团党委机关有力、有序、有度、有效推进基层建设提供了基本遵循。要着力发挥《纲要》的规范和指导作用，以科学发展的思想、辩证统一的思维、求真务实的思路抓好基层建设，着力谋求落实《纲要》的“神”“形”统一。