[1] Longqing Qiu, Yi Zhang, Hans-Joachim Krause, Alex I. Braginski, Martin Burghoff, and Lutz Trahms, Nuclear magnetic resonance in the earth’s magnetic field using a nitrogen-cooled superconducting quantum interference device, Applied Physics Letters, 91 (2007) 072505.
[2] Yi Zhang, Longqing Qiu, Hans-Joachim Krause, Stefan Hartwig, Martin Burghoff, and Lutz Trahms, Liquid state nuclear magnetic resonance at low fields using a nitrogen cooled superconducting quantum interference device, Applied Physics Letters, 90 (2007) 182503.
[3] Longqing Qiu, Yi Zhang, Hans-Joachim Krause, Alex I. Braginski, and Alexander Usoskin, High-temperature superconducting quantum interference device with cooled LC resonant circuit for measuring alternating magnetic fields with improved signal-to-noise ratio, Review of Scientific Instruments, 78 (2007) 054701.
[4] Longqing Qiu, Yi Zhang and Hans-Joachim Krause, HTS SQUID based Earth’s Magnetic Field NMR, Journal of Physics: Conference Series 97 (2008) 012026.
[5] Longqing Qiu, Yi Zhang, Hans-Joachim Krause, Alex I. Braginski, Andreas Offenhaeusser, Low-field NMR measurement procedure when SQUID detection is used, Journal of Magnetic Resonance 196 (2009) 101-104.
[6] Yi Zhang, Longqing Qiu, Hans-Joachim Krause, Hui Dong, Alex. I. Braginski, Saburo Tanaka, Andreas Offenhaeusser, Low-field NMR Measurements Using HTS rf-SQUIDs, accepted by ISS2008 (in press).
[7] Longqing Qiu, Hans-Joachim Krause, Yi Zhang, Hui Dong, Alex I. Braginski, and Andreas Offenhäusser, The Effect of Low Frequency Disturbance to SQUID-Based Low Field NMR, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19(3) (2009) 827-830.
[8] Longqing Qiu, Yi Zhang, Hans-Joachim Krause, Alex I. Braginski, Saburo Tanaka, and Andreas Offenhäusser, High-Performance Low-field NMR Utilizing a High-Tc rf SQUID, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19(3) (2009) 831-834.
[9] Yi Zhang, Longqing Qiu, Hans-Joachim Krause, Dong Hui, Alex I. Braginski, Saburo Tanaka, and Andreas Offenhäusser, Overview of low-field NMR measurements using HTS rf-SQUIDs, Physica C 469 (2009) 1624-1629.
[10] Longqing Qiu, Guofeng Zhang, Yongliang Wang and Xiaoming Xie, SQUID based LF-NMR measurements in an urban laboratory environment, Journal of Physics: Conference Series 234 (2010) 042028.
[12] Qiu Longqing, Gu Mu, Liu Xiaolin, Zhang Rui, Xu Xin; Modification of Gd203 : Eu3+ sol-gel Luminescence Films; Proc. of SPIE, Vol. 5774, 633-636. 2004.
[13] Chao Liu, Yi Zhang, Longqing Qiu, Hui Dong, Hans-Joachim Krause, Xiaoming Xie and Andreas Offenhaeusser, Low-field MRI measurements using a tuned HTS SQUID as detector and permanent magnet pre-polarization field, Supercond. Sci. Technol. 25 (2012) 075013 (6pp)
[14] Hui Dong, Longqing Qiu, Wen Shi, Baolin Chang, Yang Qiu et al. Ultra-low field magnetic resonance imaging detection with gradient tensor compensation in urban unshielded environment, APPLIED PHYSICS LETTERS 102, 102602 (2013),
[15] Liu C, Zhang Y, Dong H, Qiu L. Q. et al. Tuned HTS SQUID-detected low field MRI using a permanent magnet for pre-polarization with automatic transportation [J]. IEEE Trans Appl Supercon, 2013, 23(3).
[16] Liu C, Zhang Y, Qiu L, et al. Permanent magnet pre-polarization in low field MRI measurements using SQUID [J]. Physics Procedia, 2012, 36(0): 274-279.
[17] Qiu L, Liu C, Dong H, et al. Time-domain frequency correction method for averaging low-field NMR signals acquired in urban laboratory environment [J]. Chinese Physics Letters, 2012, 29(10): 107601.
[18] Qiu L Q, Liu C, Dong H, et al. Magnetic field Improved ULF-NMR measurement in an unshielded laboratory using a low-Tc SQUID [J]. Physics Procedia, 2012, 36(0): 388-393.