The chlorophyll, pheophytin, and their proportions are critical factors to evaluate the sensory quality of green tea. This research aims establish an effective method determine quantification chlorophyll pheophytin in tea, based on Fourier transform infrared (FT–IR) spectroscopy. First, five brands tea were collected for spectral acquisition, measured using reference method. Then, a relation between these two pigments FT–IR spectroscopy developed chemometrics. Additionally, characteristic IR...

Abstract Background Pumpkin seeds are major oil crops with high nutritional value and content. The collection identification of different pumpkin germplasm resources play a significant role in the realization precision breeding variety improvement. In this research, we collected 75 species from Zhejiang Province China. 35,927 near-infrared hyperspectral images types were used as research object. Results To realize rapid classification seed varieties, position attention embedded...

The wettability of plant leaves directly reflects leaf hydrophilicity, which is the key factor that influences adhesion liquid pesticide as well affects protection products (PPP) efficacy. Generally, surface quantified by contact angle and free energy (SFE), are mainly dependent on properties, properties other spraying parameters. Therefore, aim this paper was to investigate SFE rice rape with variation status, surface, probe influence droplet falling height, solid PPP concentration...

Using intelligent agricultural machines in paddy fields has received great attention. An obstacle avoidance system is required with the development of machines. In order to make more intelligent, detecting and tracking obstacles, especially moving obstacles fields, basis avoidance. To achieve this goal, a red, green blue (RGB) camera computer were used build machine vision system, mounted on transplanter. A method that combined improved You Only Look Once version 3 (Yolov3) deep Simple...

The object detection method based on deep learning convolutional neural network (CNN) significantly improves the performance of wheat head images obtained from near ground. Nevertheless, for different stages, high density, and overlaps captured by aerial-scale unmanned aerial vehicle (UAV), existing learning-based methods often have poor effects. Since receptive field CNN is usually small, it not conducive to capture global features. visual Transformer can information an image; hence we...

Colorimetric gas sensors show promise as selective detectors for chromatography (GC), but their application has been limited by the irreversibility of responses. This study presents successful hyphenation colorimetric with GC, overcoming this limitation through a novel approach that refreshes sensor's reaction area controlled movement, enabling generation reversible GC peaks. The sensors, based on acid-base indicators, such chlorophenol red and bromocresol green, were integrated capillary...

By using nuclear magnetic resonance (NMR) and CT scanning technologies, hydration experiments have been conducted on shale samples from the Lower Silurian Longmaxi Formation in Zhaotong area North Yunnan Guizhou Provinces under confining pressure of 10 MPa to study effect propagation pores natural fractures formation. The results show that not only offsets permeability drop caused by pressure, but makes fracture network more complicated, connection between better with larger volume, higher...

High nitrate (NO3−) in vegetables, especially leaf vegetables poses threaten to human health. Selenium (Se) is an important element for maintaining health, and exogenous Se application during vegetable crop production effective way prevent deficiency bodies. Exogenous shows positive function on plant growth nutrition uptake under abiotic and/or biotic stresses. However, the influence of NO3− accumulation hydroponic still not clear. In present study, lettuce plants were subjected six...

Localization is a critical problem in the research of intelligent vehicles. Although it can be achieved by using real-time kinematic global positioning system (RTK-GPS, or fused with other methods such as dead reckoning), may unfeasible if every vehicle has to equipped an expensive sensor. This paper proposes ground-texture-based map-matching approach address localization problem. To reduce effect complicated illumination outdoor environments, camera fixed downward at bottom vehicle, and...

A novel isolate belonging to the genus Streptomyces , strain CCNWHQ 0031 T was isolated from soil in a sewage irrigation area Shaanxi province, China. The produced light greyish-blue aerial mycelium and dark blue diffusible pigment on Gause’s synthetic agar. Strain formed Spirales -type chains with spiny spores. Chemotaxonomic data confirmed that belonged . Analysis of almost complete 16S rRNA gene sequence placed where it distinct phyletic line recognized species. exhibited highest...

In this study, confocal Raman microspectroscopy was used to detect lipids in microalgae rapidly and non-destructively. Microalgae cells were cultured under nitrogen deficiency. The accumulation of Scenedesmus obliquus observed by Nile red staining, the total amount accumulated measured gravimetric method. signals from different collected establish a prediction model intracellular lipid content, surface scanning for drawing pseudo color images distribution. can show location pyrenoid cells....

The non-judicious use of pesticides in agro-food poses a severe threat to food safety and human health. As an emerging chromatographic fingerprint provider, surface-enhanced Raman spectroscopy analysis (SERS) sheds bright light on sensitive nondestructive detection pesticide residues. This research proposed novel strategy detect three-pesticide residues (thiabendazole, carbendazim, chlorpyrifos) tomato peel based the flexible sticky SERS substrate. After selecting best commercial adhesive...

Wet chemical methods are usually employed in the analysis of macronutrients such as Potassium (K) and Phosphorus (P) followed by traditional sensor techniques, including inductively coupled plasma optical emission spectrometry (ICP OES), flame atomic absorption (FAAS), graphite furnace (GF AAS), mass (ICP-MS). Although these procedures have been established for many years, they costly, time-consuming, challenging to follow. This study studied combination laser-induced breakdown spectroscopy...