[1] Hangyo M. Development and future prospects of terahertz technology[J]. Japanese Journal of Applied Physics, 54, 120101(2015).

[2] Shibata T, Mori T, Kojima S. Low-frequency vibrational properties of crystalline and glassy indomethacin probed by terahertz time-domain spectroscopy and low-frequency Raman scattering[J]. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 150, 207-211(2015).

[3] Hossain M, Fakhruddin A, Chowdhury A Z et al. Health risk assessment of selected pesticide residues in locally produced vegetables of Bangladesh[J]. International Food Research Journal, 22, 110-115(2015).

[4] Wang S F, Han P, Wang J H et al. Application of X-ray fluorescence spectrometry on the detection of heavy metals in soil[J]. Journal of Food Safety & Quality, 7, 4394-4400(2016).

[5] Gao B B, Zhang Q, Tian M M et al. Enantioselective determination of the chiral pesticide isofenphos-methyl in vegetables, fruits, and soil and its enantioselective degradation in pak choi using HPLC with UV detection[J]. Analytical and Bioanalytical Chemistry, 408, 6719-6727(2016).

[6] Decka D, Schwaab G, Havenith M. A THz/FTIR fingerprint of the solvated proton: evidence for Eigen structure and Zundel dynamics[J]. Physical Chemistry Chemical Physics, 17, 11898-11907(2015).

[7] Wang G Q, Shen J L, Jia Y. Vibrational spectra of ketamine hydrochloride and 3, 4-methylenedioxymethamphetamine in terahertz range[J]. Journal of Applied Physics, 102, 013106(2007).

[8] Ullah R, Li H, Zhu Y M. Terahertz and FTIR spectroscopy of ‘bisphenol A’[J]. Journal of Molecular Structure, 1059, 255-259(2014).

[9] Hakey P M, Allis D G, Hudson M R et al. Terahertz spectroscopic investigation of S +-ketamine hydrochloride and vibrational assignment by density functional theory[J]. The Journal of Physical Chemistry A, 114, 4364-4374(2010).

[10] Zhang F, Kambara O, Tominaga K et al. Analysis of vibrational spectra of solid-state adenine and adenosine in the terahertz region[J]. RSC Advances, 4, 269-278(2014).

[11] Dai Z L, Xu X D, Gu Y et al. A terahertz study of taurine: dispersion correction and mode couplings[J]. The Journal of Chemical Physics, 146, 124119(2017).

[12] Li H T, Sun C H, Vijayaraghavan R et al. Long lifetime photoluminescence in N, S co-doped carbon quantum dots from an ionic liquid and their applications in ultrasensitive detection of pesticides[J]. Carbon, 104, 33-39(2016).

[13] Abdi H, Williams L J. Principal component analysis[J]. Wiley Interdisciplinary Reviews: Computational Statistics, 2, 433-459(2010).

[14] Flath C, Nicolay D, Conte T et al. Cluster analysis of smart metering data[J]. Business & Information Systems Engineering, 4, 31-39(2012).

[15] Ben-Hur A, Weston J[M]. A user's guide to support vector machines, 223-239(2009).

[16] Kuosmanen T, Johnson A L. Data envelopment analysis as nonparametric least-squares regression[J]. Operations Research, 58, 149-160(2010).

[17] Cook R D, Helland I S, Su Z. Envelopes and partial least squares regression[J]. Journal of the Royal Statistical Society: Series B (Statistical Methodology), 75, 851-877(2013).

[18] da Silva I N, Spatti D H, Flauzino R A et al[M]. Artificial neural networks(2017).

[19] Gu B, Sheng V S, Tay K Y et al. Incremental support vector learning for ordinal regression[J]. IEEE Transactions on Neural Networks and Learning Systems, 26, 1403-1416(2015).

[20] Cao B H, Li H, Fan M B et al. Determination of pesticides in a flour substrate by chemometric methods using terahertz spectroscopy[J]. Analytical Methods, 10, 5097-5104(2018).

[21] Ma J X. Research on THz detection of pesticide[D]. Qingdao: Qingdao University of Science & Technology(2014).

[22] Baek S H, Kang J H, Hwang Y H et al. Detection of methomyl, a carbamate insecticide, in food matrices using terahertz time-domain spectroscopy[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 37, 486-497(2016).

[23] Oppenheim K C, Korter T M, Melinger J S et al. Solid-state density functional theory investigation of the terahertz spectra of the structural isomers 1, 2-dicyanobenzene and 1, 3-dicyanobenzene[J]. The Journal of Physical Chemistry A, 114, 12513-12521(2010).

[24] Liu Y D, Du X Y, Li B et al. Detection of benzoic acid in arrowroot by terahertz technology[J]. Laser & Optoelectronics Progress, 56, 041101(2019).

[25] Xia Y, Li M, Yuan S et al. Terahertz characteristic peaks of Al(OH)3 and techniques for their enhancement[J]. Laser & Optoelectronics Progress, 56, 041101(2019).

[26] Chen T, Cai Z H. Terahertz time-domain spectroscopy of L-, D-and DL-arabinose[J]. Laser & Optoelectronics Progress, 55, 063001(2018).

[27] Massaouti M, Daskalaki C, Gorodetsky A et al. Detection of harmful residues in honey using terahertz time-domain spectroscopy[J]. Applied Spectroscopy, 67, 1264-1269(2013).

[28] Qu F F, Lin L, He Y et al. Spectral characterization and molecular dynamics simulation of pesticides based on terahertz time-domain spectra analyses and density functional theory (DFT) calculations[J]. Molecules, 23, 1607(2018).

[29] Yu J P, Li C, Yi W T et al. Temperature dependence of terahertz spectra of amino acid[J]. Spectroscopy and Spectral Analysis, 38, 386-393(2018).

[30] Qu F F, Lin L, Cai C Y et al. Molecular characterization and theoretical calculation of plant growth regulators based on terahertz time-domain spectroscopy[J]. Applied Sciences, 8, 420(2018).

[31] Wang Q, Ma Y H . Qualitative and quantitative identification of nitrofen in terahertz region[J]. Chemometrics & Intelligent Laboratory Systems, 127, 43-48(2013).

[32] Lee D K, Giyoung K, Joo-Hiuk S. Optical characteristics of pesticides measured by terahertz time domain spectroscopy[J]. Proceedings of SPIE, 9655, 965516(2015).

[33] Huang Y H, Luan H J, Liu S Q et al. Pesticide classification based on support vector machine and terahertz spectroscopy[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 36, 482-486(2015).

[34] Hao G H, Guo C S, Du Y et al. Investigation of diflubenzuron and λ-cyhalothrin by terahertz spectroscopy and density functional theory. [C]//International Photonics and Optoelectronics Meetings, Wuhan. Washington, D.C.: OSA(2012).

[35] Zhang Y Y. Terahertz spectroscopic investigation of plant growth regulators[D]. Beijing: Capital Normal University(2014).

[36] Ma Y H, Wang Q, Li L Y. PLS model investigation of thiabendazole based on THz spectrum[J]. Journal of Quantitative Spectroscopy and Radiative Transfer, 117, 7-14(2013).

[37] Qu F F, Pan Y, Lin L et al. Experimental and theoretical study on terahertz absorption characteristics and spectral de-noising of three plant growth regulators[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 39, 1015-1027(2018).

[38] Qin B Y, Li Z, Luo Z H et al. Terahertz time-domain spectroscopy combined with PCA-CFSFDP applied for pesticide detection[J]. Optical and Quantum Electronics, 49, 244(2017).

[39] Qin B Y. Rapid detection of pesticide residue in crops base on combined terahertz spectroscopy with chemometrics Xi'an:[D]. Xidian University(2018).

[40] Zhan H L, Wu S X, Bao R M et al. Qualitative identification of crude oils from different oil fields using terahertz time-domain spectroscopy[J]. Fuel, 143, 189-193(2015).

[41] Chen Z W, Zhang Z Y, Zhu R H et al. Application of terahertz time-domain spectroscopy combined with chemometrics to quantitative analysis of imidacloprid in rice samples[J]. Journal of Quantitative Spectroscopy and Radiative Transfer, 167, 1-9(2015).

[42] Huang Y H, Liu S Q, Luan H J et al. Terahertz spectroscopic investigation on dipterex and chlorodifon[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 36, 291-296(2015).