Comprehensive Characterization of Aroma Compounds in Four Different Varieties of Cigar Tobacco Leaves from China Using HS-SPME-GC × GC-TOF-MS Combined with Flavor Profiling.

In order to conduct in-depth research on the stylistic characteristics of different varieties of cigar tobacco leaves (CTLs), we have carried out the following research work: first, the Soxhlet extraction method was utilized for the pretreatment of 4 different varieties of CTLs currently available in China. Then, the two-dimensional (2D) gas chromatography-time-of-flight mass spectrometry (GC × GC-TOF-MS) technology was applied for the nontargeted flavoromics analysis of CTLs. A total of 2117 volatile compounds were identified in the extracts of the 4 CTLs varieties, encompassing alcohols, aldehydes, ketones, carboxylic acids, and their derivatives, esters, hydrocarbons, alkenes, heterocyclic compounds, and aromatics.

An intelligent monitoring system of diseases and pests on rice canopy.

Accurate and timely surveys of rice diseases and pests are important to control them and prevent the reduction of rice yields. The current manual survey method of rice diseases and pests is time-consuming, laborious, highly subjective and difficult to trace historical data. To address these issues, we developed an intelligent monitoring system for detecting and identifying the disease and pest lesions on the rice canopy.

Measurement of acoustic properties for passive-material samples using multichannel inverse filter.

The measurement of acoustic properties for passive-material samples is strongly interfered by reverberations in a limited space. A multichannel inverse filter (MIF) can achieve spatio-temporal focusing by retransmitting the optimal signal estimated from multichannel impulse responses of the transmitter channel and the underwater acoustic channel. To decrease the influence of reverberations on measurements and improve the measurement precision, a MIF is employed to measure the echo reduction and insertion loss, respectively.