Terahertz heterodyne receivers with high sensitivity and spectral resolution are crucial for various applications.Here,we present a room-temperature atomic terahertz heterodyne receiver that achieves ultrahigh sensiti...Terahertz heterodyne receivers with high sensitivity and spectral resolution are crucial for various applications.Here,we present a room-temperature atomic terahertz heterodyne receiver that achieves ultrahigh sensitivity and frequency resolution.At a signal frequency of 338.7 GHz,we obtain a sensitivity of 2.88±0.09V·cm^(−1)·Hz^(−1/2) for electric field measurements.The calibrated linear dynamical range spans approximately 89 dB,ranging from−110 dBV/cm to−21 dBV/cm.We demodulate a 400 symbol stream encoded in 4-state phase-shift keying,demonstrating excellent phase detection capability.By scanning the frequency of the local oscillator,we realize a terahertz spectrometer with Hz level frequency resolution.This resolution is more than two orders of magnitude higher than that of existing terahertz spectrometers.The demonstrated terahertz heterodyne receiver holds promising potential for working across the entire terahertz spectrum,significantly advancing its practical applications.展开更多
妊娠期高血压疾病(hypertension in pregnancy,HIP)是妊娠与血压升高并存的一种疾病,可对孕产妇全身各器官产生不良影响,如可导致胎盘早剥、弥散性血管内凝血、心肝肾衰竭、肺水肿、高血压脑病,甚至死亡,亦可造成胎儿生长受限、羊水过...妊娠期高血压疾病(hypertension in pregnancy,HIP)是妊娠与血压升高并存的一种疾病,可对孕产妇全身各器官产生不良影响,如可导致胎盘早剥、弥散性血管内凝血、心肝肾衰竭、肺水肿、高血压脑病,甚至死亡,亦可造成胎儿生长受限、羊水过少、早产、宫内窘迫、神经系统损伤,甚至死亡,为产科严重并发症之一,是孕产妇及围产儿高发病率及死亡率的主要原因。多普勒超声因具有无创、价格低廉等优点,广泛用于产前超声诊断,常规用于监测妊娠期并发症及评价围产儿结局。该文对多普勒超声检查在妊娠期高血压疾病中的应用研究进展进行综述。展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2021YFA1402004)the Key-Area Research and Development Program of Guangdong Province,China(Grant Nos.2019B030330001 and 2020B0301030008)+2 种基金the National Natural Science Foundation of China(Grant Nos.12225405,12204182,and U20A2074)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0301705)the Natural Science Foundation of Guangdong Province,China(Grant No.2022A1515012026).
文摘Terahertz heterodyne receivers with high sensitivity and spectral resolution are crucial for various applications.Here,we present a room-temperature atomic terahertz heterodyne receiver that achieves ultrahigh sensitivity and frequency resolution.At a signal frequency of 338.7 GHz,we obtain a sensitivity of 2.88±0.09V·cm^(−1)·Hz^(−1/2) for electric field measurements.The calibrated linear dynamical range spans approximately 89 dB,ranging from−110 dBV/cm to−21 dBV/cm.We demodulate a 400 symbol stream encoded in 4-state phase-shift keying,demonstrating excellent phase detection capability.By scanning the frequency of the local oscillator,we realize a terahertz spectrometer with Hz level frequency resolution.This resolution is more than two orders of magnitude higher than that of existing terahertz spectrometers.The demonstrated terahertz heterodyne receiver holds promising potential for working across the entire terahertz spectrum,significantly advancing its practical applications.
文摘妊娠期高血压疾病(hypertension in pregnancy,HIP)是妊娠与血压升高并存的一种疾病,可对孕产妇全身各器官产生不良影响,如可导致胎盘早剥、弥散性血管内凝血、心肝肾衰竭、肺水肿、高血压脑病,甚至死亡,亦可造成胎儿生长受限、羊水过少、早产、宫内窘迫、神经系统损伤,甚至死亡,为产科严重并发症之一,是孕产妇及围产儿高发病率及死亡率的主要原因。多普勒超声因具有无创、价格低廉等优点,广泛用于产前超声诊断,常规用于监测妊娠期并发症及评价围产儿结局。该文对多普勒超声检查在妊娠期高血压疾病中的应用研究进展进行综述。
