Dicofol is a highly toxic residual pesticide in tea, which seriously endangers human health. A method for detecting dicofol tea by combining stoichiometry with surface-enhanced Raman spectroscopy (SERS) technology was proposed this study. AuNPs were prepared, and silver shells grown on the surface of to obtain core–shell Au@AgNPs. Then, Au@AgNPs attached PDMS membrane physical deposition Au@AgN...

direct orthogonal signal correction(dosc) and savitzky-golay filters (sgf) were applied as preprocessing methods on the original and first derivative absorbance data. principle component regression (pcr), partial least squares (pls) and iterative target transformation factor analysis (ittfa), were used in spectrophotometric simultaneous determination of heavy divalent metal ions, lead, zinc,mer...

a non-destructive, rapid and low-cost determination of date fruit moisture content is one of the most determining factors in maturity assessment and processing of this valuable product. on the other hand, the potential of near infrared (nir) spectroscopy in nondestructive internal quality evaluation of agricultural products has been proved throughout several studies. in this research, three mod...

This article presents a new subspace-based technique for reducing the noise of signals in time-series. In the proposed approach, the signal is initially represented as a data matrix. Then using Singular Value Decomposition (SVD), noisy data matrix is divided into signal subspace and noise subspace. In this subspace division, each derivative of the singular values with respect to rank order is u...

Accurately identifying the phenology of summer maize is crucial for both cultivar breeding and fertilizer controlling in precision agriculture. In this study, daily RGB images covering entire growth were collected using phenocams at sites Shangqiu (2018, 2019 2020) Nanpi (2020) China. Four phenological dates, including six leaves, booting, heading maturity maize, pre-defined extracted from phen...

In this paper, a moving-average method of smoothing noise based on complex exponential decomposition is applied to eliminate non-stationary signal and non-linear produced by Bouc–Wen model, which are added white Gaussian simulate the in measured signal. The uses sliding window cutting entire and/or into small segments considers that stable linear. decomposed series components via decomposition,...

We introduce the notion of canonical form for Golay sequences such that every equivalence class contains exactly one member having the canonical form. Golay and Turyn have shown how to multiply Golay sequences of length m with Golay sequences of length n in order to construct Golay sequences of length mn. We say that Golay sequences of length n are constructible if they can be manufactured from...

The petrochemical industry is a pillar for the development of national economy affecting people’s daily living standards. Crude distillation process core and leading unit industry. Its energy consumption accounts more than 20% total whole plant, which highest link. A model based on long short-term memory network (LSTM) proposed in this paper to predict analyze efficiency. This extracts complex ...

This study investigated the abilities of pre-processing, feature selection and machine-learning methods for the spectroscopic diagnosis of soil arsenic contamination. The spectral data were pre-processed by using Savitzky-Golay smoothing, first and second derivatives, multiplicative scatter correction, standard normal variate, and mean centering. Principle component analysis (PCA) and the RELIE...

Grapevine phenology observations are essential for ecological adaptability of grape varieties, crop management and crop modelling. Phenological events have traditionally been ground based, with observations mainly providing information concerning grape varieties over a limited spatial area and few inseason observations. Time-series of satellite imagery can rapidly provide a synoptic and objecti...