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Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Beijing University of Technology is the property of Journal of Beijing University of Technology, Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Cotton Textile Technology is the property of Cotton Textile Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

OBJECTIVE: To probe int the interactions of pharmacokinetics between flavonoids and synephrine in fructus aurantii immaturus based on ultra performance liquid chromatography-triple quadrupole tandem mass spectrometry (UPLC-MS / MS), so as to provide scientific basis for the introduction of flavonoids as a quality and quantitative control index of fructus aurantii immaturus. METHODS: A total of 24 SD rats were extracted to be randomly divided into six groups ( n = 4), group A was administrated with synephrine + six kinds of categories of flavonoids (neohesperidin, naringin, narirutin, hesperidin, nobiletin and rhoifolin), group B was administrated with synephrine alone, group C was administrated with synephrine + naringin, group D was administrated with synephrine + neohesperidin, group E was administrated with six categories of flavonoids alone, group F was administrated with an equal volume of 0. 9% NaCl solution, all administered by gavage. The plasma was taken at different time points after administration, the contents of naringin, neohesperidin and synephrine in plasma were determined, and DAS 2. 0 software was used to calculate the pharmacokinetic parameters. The blood concentration was determined by using UPLC-MS / MS method. RESULTS: Clearance rate of neohesperidin in group A was (9 337. 88±8 373. 94) L/ (h·kg), significantly higher than (2 558. 22±610. 87) L/ (h·kg) in group E, with statistically significant difference (P<0. 05). The distribution volume of neohesperidin in group A and group D were respectively (2 549. 72±1 381. 42) L / kg and (1 668. 41± 394. 73) L / kg, significantly lower than ( 23 388. 87 ± 6 089. 53) L / kg in group E, with statistically significant differences ( P < 0. 05). The mean detention time of synephrine in group A was ( 2. 50 ± 0. 63) h, in comparison with (1. 62±0. 11) h, (1. 70±0. 17) h and (1. 57±0. 08) h of groups B, C and D, the differences were all statistically significant ( P < 0. 05 ). CONCLUSIONS: Synephrine has great effect on the clearance rate and distribution of neohesperidin, and the flavonoids in fructus aurantii immaturus can prolong the mean detention time of synephrine. [ABSTRACT FROM AUTHOR]

Copyright of Science & Technology of Food Industry is the property of Science & Technology of Food Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Practical Oncology Journal is the property of Journal of Practical Oncology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Advances in New & Renewable Energy is the property of Editorial Office of Advances in New & Renewable Energy and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Textile Leader is the property of China Textile Information Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Significance] Crop production is related to national food security, economic development and social stability, so timely information on the growth of major crops is of great significance for strengthening the crop production management and ensuring food security. The traditional crop growth monitoring mainly judges the growth of crops by manually observing the shape, color and other appearance characteristics of crops through the external industry, which has better reliability and authenticity, but it will consume a lot of manpow‐ er, is inefficient and difficult to carry out monitoring of a large area. With the development of space technology, satellite remote sens‐ ing technology provides an opportunity for large area crop growth monitoring. However, the acquisition of optical remote sensing data is often limited by the weather during the peak crop growth season when rain and heat coincide. Synthetic aperture radar (SAR) com‐ pensates well for the shortcomings of optical remote sensing, and has a wide demand and great potential for application in crop growth monitoring. However, the current research on crop growth monitoring using SAR data is still relatively small and lacks system‐ atic sorting and summarization. In this paper, the research progress of SAR inversion of crop growth parameters were summarized through comprehensive analysis of existing literature, clarify the main technical methods and application of SAR monitoring of crop growth, and explore the existing problems and look forward to its future research direction. [Progress] The current research status of SAR crop growth monitoring were reviewed, the application of SAR technology had gone through several development stages: from the early single-polarization, single-band stage, gradually evolving to the mid-term multipolarization, multi-band stage, and then to the stage of joint application of tight polarization and optical remote sensing. Then, the re‐ search progress and milestone achievements of crop growth monitoring based on SAR data were summarized in three aspects, namely, crop growth SAR remote sensing monitoring indexes, crop growth SAR remote sensing monitoring data and crop growth SAR remote sensing monitoring methods. First, the key parameters of crop growth were summarized, and the crop growth monitoring indexes were divided into morphological indicators, physiological and biochemical indicators, yield indicators and stress indicators. Secondly, the core principle of SAR monitoring of crop growth parameters was introduced, which was based on the interaction between SAR sig‐ nals and vegetation, and then the specific scattering model and inversion algorithm were used to estimate the crop growth parameters. Then, a detailed summary and analysis of the radar indicators mainly applied to crop growth monitoring were also presented. Finally, SAR remote sensing methods for crop growth monitoring, including mechanistic modeling, empirical modeling, semi-empirical modeling, direct monitoring, and assimilation monitoring of crop growth models, were described, and their applicability and applications in growth monitoring were analyzed. [Conclusions and Prospects] Four challenges exist in SAR crop growth monitoring are proposed: 1) Compared with the methods of crop growth monitoring using optical remote sensing data, the methods of crop growth monitoring using SAR data are obviously relatively small. The reason may be that SAR remote sensing itself has some inherent shortcomings; 2) Insufficient mining of microwave scattering characteristics, at present, a large number of studies have applied the backward scattering intensity and polarization characteristics to crop growth monitoring, but few have applied the phase information to crop growth monitoring, especially the application study of polarization decomposition parameters to growth monitoring. The research on the application of polarization decomposition parameter to crop growth monitoring is still to be deepened; 3) Compared with the optical vegetation index, the radar vegetation index applied to crop growth monitoring is relatively less; 4 ) Crop growth monitoring based on SAR scattered intensity is mainly based on an empirical model, which is difficult to be extended to different regions and types of crops, and the existence of this limitation pre‐ vents the SAR scattering intensity-based technology from effectively realizing its potential in crop growth monitoring. Finally, future research should focus on mining microwave scattering features, utilizing SAR polarization decomposition parameters, developing and optimizing radar vegetation indices, and deepening scattering models for crop growth monitoring. [ABSTRACT FROM AUTHOR]

Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chinese Mass Spectrometry Society is the property of Journal of Chinese Mass Spectrometry Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Depressive disorder, as one of the major diseases in the world, has always received much attention for its prevention and treatment. As an emerging treatment, exercise therapy has optimistic application prospect with the advantages such as lower cost, fewer side effects and easier implementation, compared to conventional treatments such as drug therapy and physical therapy. Relevant studies have explored the mechanism of exercise in the treatment of depressive disorder, but the mechanism is not clear yet, which may involve improving the levels of neurobiochemical molecules, inhibiting inflammatory response, regulating neuroendocrine system, improving neuroplasticity, and other aspects. Exercise therapy has been proved to have similar biological effects with antidepressants, and may have overlapping effects with other treatments. Early intervention can benefit both nondiseased and already diseased populations to a certain extent. At present, there is still a gap in the clinical field related to exercise therapy for depressive disorder, and there are few high-quality studies. The design of exercise therapy plans is still in the exploratory stage, and there is no consensus on the design of exercise therapy plans. Additionally, there is a lack of relevant exercise therapy guidelines for clinicians to refer to. This review systematically introduces the biological mechanism of exercise therapy for depressive disorder, summarizes the clinical research results in this field carried out at home and abroad, and analyzes the current program and advantages and disadvantages of exercise therapy, in order to provide reference for the in-depth development of the exercise therapy researches. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Beijing University of Traditional Chinese Medicine is the property of Journal of Beijing University of Traditional Chinese Medicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Laser Biology / Acta Laser Biology Sinica is the property of Acta Laser Biology Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Deep learning has gone through breakthroughs in many research fields including computer vision, natural language processing, etc. due to multiple driving factors such as knowledge, data, algorithms and computing power. In addition, it has gradually spawned a number of new research directions with the migration and application as well as cross-integration among various disciplines. Cheminformatics is a discipline that solves chemical problems with the applied informatics methods, and deep learning can be useful since it is very powerful in nonlinear learning. Deep learning model can be used to screen and predict in the data set, and then verify the feasibility of the results based on theoretical calculation. Finally, the results are represented by experiments, which shortens the experimental period, reduces the labor cost and accelerates the intelligence of cheminformatics. This paper briefly introduces the development history and main network model architecture of deep learning as well as the latest research and application status of deep learning in synthesis planning, compound structure-activity relation and catalyst design in recent years, and also discusses and expects the future development direction. [ABSTRACT FROM AUTHOR]

Copyright of Railway Investigation & Surveying is the property of Railway Investigation & Surveying Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: To investigate the effects of total flavonoids from Scutellaria barbata on neurological function and oxidative stress injury in rats with cerebral ischemia-reperfusion injury (CIRI) rats based on phosphatidylinositol 3 kinase (PI3K)/serine threonine protein kinase (Akt)/mammalian rapamycin (mTOR) signaling pathway. Methods: 70 SPF grade male SD rats were selected to establish the middle cerebral artery occlusion (MCAO) model by suture method, 60 rats with successful modeling were randomly divided into model group, low-dose total flavonoids from Scutellaria barbata group (Scutellaria barbata L group), medium-dose total flavonoids from Scutellaria barbata group (Scutellaria barbata M group), high-dose total flavonoids from Scutellaria barbata group (Scutellaria barbata H group), control group and LY294002 group, with 10 rats in each group, the remaining 10 rats served as sham group. The Scutellaria barbata L, M, H groups were given total flavonoids from Scutellaria barbata 0.1, 0.2 and 0.4 g/kg dissolved in 2 mL normal saline by gavage, respectively, while control group was given nimodipine 0.3 g/kg dissolved in 2 mL normal saline by gavage. LY294002 group was given 0.4 g/kg total flavonoids from Scutellaria barbata dissolved in 2 mL normal saline by gavage, while PI3K inhibitor LY294002 20 μmol/L was injected into the lateral ventricle. Model group and sham group were given the same amount of normal saline by gavage. Neurological function score, brain tissue water volume, cerebral infarction volume, brain tissuehistopathological changes, brain tissue oxidative stress level, brain tissue p-PI3K/PI3K, P-Akt /Akt, p-MTOR /mTOR protein expression of rats in each group were compared. Results: Compared with the neurological function score, brain tissue water content, cerebral infarction volume and malondialdehyde (MDA) level of rats in each group, the model group were significantly higher than those in sham group, and Scutellaria barbata L, M, H and control groups were lower than those in model group, and Scutellaria barbata H group was better than Scutellaria barbata L, M group, but LY294002 group was higher than Scutellaria barbata H group (P<0.05). Compared with the level of superoxide dismutase (SOD) and p-PI3K/PI3K, p-Akt/Akt and p-mTOR/mTOR protein expression of rats in each group, the model group was significantly lower than the sham group, and the Scutellaria barbata L, M, H and control groups were all higher than the model group, and Scutellaria barbata H group was better than Scutellaria barbata L, M group, but LY294002 group was lower than the Scutellaria barbata H group (P<0.05). Conclusion: The total flavonoids from Scutellaria barbata may improve neural function and oxidative stress injury in CIRI rats by activating PI3K/Akt/mTOR signaling pathway, and the improvement effect of high dose total flavonoids from Scutellaria barbata is the most significant. [ABSTRACT FROM AUTHOR]

It is still controversial whether primary tumor resection (PTR) can improve the overall survival (OS) of patients with de novo stage Ⅳ breast cancer. This review is based on the literature from different databases，from the theoretical basis，retrospective，prospective，registered clinical studies and so on. Most retrospective studies have found that PTR can provide survival benefit for patients with de novo stage Ⅳ breast cancer. However，there are relatively few prospective controlled studies.The majority of the published prospective studies oppose primary site surgery. There is an overall tendency that PTR can improve OS in patients with de novo stage Ⅳ breast cancer with bone metastases and prolong the progression-free survival (PFS) of all de novo stage Ⅳ breast cancer patients. Holistic treatment needs individualization. PTR should be carefully selected for patients with triple negative breast cancer，brain metastasis，multiple organ metastasis or expected survival time of less than 6 months. In order to improve the quality of life，PTR can be combined with plastic repair technology.Multicenter prospective randomized controlled clinical trials designed by new biological classification methods are useful to further evaluate the benefits of PTR to patients with de novo stage Ⅳ breast cancer. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Foliage spray is the most commonly used method of chemical pesticide application at present, but it has some defects such as evaporation, drift, bounce, rupture, and excess spread, resulting in low utilization of pesticides. Through the investigation of pesticide absorption and conductivity and the selection of appropriate pesticides for root application, the adverse effects of environmental factors on the active pesticide ingredients will be reduced. Longer efficacy can be maintained through slow release and dose regulation of pesticides to effectively improve the utilization of pesticides. In this paper, the absorption and conduction behaviors of five different types of fungicides (tricyclazole, thifluzamide, hexaconazole, epoxiconazole, azoxystrobin) in rice seedlings were studied through indoor nutrient soil and nutrient solution cultivation modes. The results showed that all the five fungicides could be absorbed and transmitted upward in rice seedlings, but the transmission performance was affected by the nature of the pesticides themselves. Under both cultivation conditions of nutrient soil and solution, the dose distribution of tricyclazole in the roots of rice seedlings was significantly higher than that in the aerial portions within 4 h-2 d, and the translocation factor (TF) values of tricyclazole in rice were all greater than 1 after treatment 5 days. It was shown that tricyclazole had the best upward transmission performance, while the other four pesticides showed poor upward transmission ability in rice. Tricyclazole is the most suitable for root application and the easiest to be absorbed by the root of rice and upward transmitted to leaves for the resistance to pathogen infections. This study can provide technical guidance for the pesticide selection of root application and the theoretical basis for the scientific and rational use of pesticides. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Frontiers of Computer Science & Technology is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

OBJECTIVE: To probe into the effects of walnut green husk extract on proliferation, apoptosis and epidermal growth factor receptor (EGFR) / mitogen activated protein kinase (MAPK) signaling pathway of breast cancer MCF-7 cells. METHODS: Cell counting kit-8 (CCK-8) was used to screen the proper concentration of walnut husk extract interfering with breast cancer MCF-7 cells. The breast cancer MCF-7 cells were divided into the blank control group, positive control group, walnut husk husk extract low concentration group, walnut green husk extract high concentration group, walnut green husk extract high concentration + EGFR agonist (NSC228155) group. CCK-8 and colony formation experiment were used to detect cell proliferation in each group. TUNEL method and flow cytometry were used to detect cell apoptosis in each group. Western blot was used to detect the expression levels of proliferation, apoptosis and EGFR/ MAPK signaling pathway related proteins of cells in each group. RESULTS: When the concentration of walnut green husk extract was ≥20 μg/ mL, the cell proliferation rate decreased significantly, 20 μg/ mL and 40 μg/ mL were selected as the walnut green husk extract low and high concentration treatment, respectively. Compared with the blank control group, the cell proliferation rate, the number of cell colonies, the expression levels of CyclinD1, proliferating cell nuclear antigen (PCNA) and B cell lymphoma-2 (Bcl-2) protein, the ratio of phosphorylated-EGFR (p-EGFR) / EGFR, phosphorylated extracellular signal-regulated kinase (p-ERK) / extracellular signal-regulated kinase ( ERK ), phosphorylated-p38 MAPK ( p-p38 MAPK ) / p38 MAPK and phosphorylated c-Jun amino-terminal protein kinase (p-JNK) / c-Jun amino-terminal protein kinase (JNK) protein in the positive control group, the walnut green husk extract low concentration group and high concentration group decreased significantly, and the rate of TUNEL positive cells, the apoptosis rate, the expression level of Bcl-2 related X protein (Bax) increased significantly, with statistically significant differences (P<0. 05). Compared with the walnut green husk extract low concentration group, the cell proliferation rate, the number of cell colonies, the expression levels of CyclinD1, PCNA and Bcl-2 protein, the ratio of p-EGFR/ EGFR, p-ERK/ ERK, p-p38 MAPK/ p38 MAPK and p-JNK/ JNK protein in the walnut green husk extract high concentration group decreased, and the rate of TUNEL positive cells, the apoptosis rate, the expression level of Bax protein increased, with statistically significant differences (P<0. 05). There was no significant difference in the above indicators between the walnut green husk extract high concentration group and the positive control group (P >0. 05). Compared with the walnut green husk extract high concentration group, the cell proliferation rate, the number of cell colonies, the expression levels of CyclinD1, PCNA and Bcl-2 protein, the ratio of p-EGFR/ EGFR, p-ERK/ ERK, p-p38 MAPK/ p38 MAPK and p-JNK/ JNK protein in the walnut green husk extract high concentration + NSC228155 group increased, and the rate of TUNEL positive cells, the apoptosis rate, the expression level of Bax protein decreased, with statistically significant differences (P<0. 05). CONCLUSIONS: Walnut green husk extract may inhibit the proliferation of breast cancer MCF-7 cells and induce the apoptosis by inhibiting the EGFR/ MAPK signaling pathway. [ABSTRACT FROM AUTHOR]

Copyright of Water Conservancy Science & Techonlogy & Economy is the property of Water Conservancy Science & Technology & Economy Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Tribolium castaneum (Herbst) has been one of the most destructive insects for cereals and products in the world. A rapid and accurate detection can be greatly contributed to the stored grain in recent years. In this study, an electronic nose detection device was developed to detect the pests in stored wheat grains using the feature optimization of the gas sensor array. The volatile odor information of Herbst in wheat was also collected with different population density gradients. Firstly, the response signal of the gas sensor array was analyzed and preprocessed after collection. Then, the feature extraction and selection were performed on the response curve of the sensor array, in order to obtain the feature information of the sample. A regression model was established to predict the population density of Herbst in wheat. The Relative Change value (RC), Relative Integral value (RI), and Mean Differential value (MD) of each sensor were extracted as the original feature matrix (10×3), according to the response curves collected by 10 gas sensors. A Genetic Algorithm (GA) was adopted as the feature selection to optimize the original multi-feature matrix, where the recognition accuracy was used as the evaluation index. Finally, Partial Least Squares Regression (PLSR), Principal Component Regression (PCR), and Support Vector Regression (SVR) were used for the regression prediction. The results show that the PLSR model achieved the best prediction. The Principal Component Analysis (PCA) and Cluster Analysis (CA) were used to analyze the discrimination and aggregation between different types of samples. It was found that the electronic nose device effectively distinguished the wheat samples from those infected by pests. The redundant information was removed from the optimized feature matrix, according to the recognition accuracy and PCA data. The recognition accuracy of the feature matrix increased from 82.85% to 97.14% after GA optimization. The number of feature variables was reduced by 60% from 30 to 12, and the number of sensors was reduced to 8. The PLSR, PCR, and SVR were used to establish the prediction model before and after the optimization of the matrix. The prediction set correlation coefficient (r) and root mean square error (RMSE) of the PLSR model were 0.828 and 11.293, respectively. By contrast, the prediction set r and RMSE of the PCR model were 0.764 and 13.859, respectively. The prediction set r and RMSE of the SVR model were 0.804 and 12.976, respectively. The results showed that the PLSR was the best model for the prediction of the population density of Herbst. Consequently, the feasibility and effectiveness of the sensor array multi-feature optimization can be verified for the electronic nose detection of stored grain pests. The finding can also provide a strong reference for the rapid detection of grain pests. [ABSTRACT FROM AUTHOR]

In order to further enhance the corrosion inhibition effect of acidification inhibitor in high-temperature deep wells, a double Mannich base quaternary ammonium salt was synthesized by using chloromethylnaphthalene as quaternary ammonium intermediate and reacting with double Mannich base. The compound dispersant and synergist were optimized by single factor analysis to obtain high-temperature acidification inhibitor SJ-1. The corrosion inhibition performance was evaluated by weight loss method and electrochemical method. The results show that the corrosion rate of N80 steel sheet in 20% hydrochloric acid and earth acid can reach 70.15 g/(m2·h)and 65.32 g/(m2·h), respectively, when the dosage of high-temperature acidification inhibitor SJ-1 is only 3%, which are less than the first-class index in SY / T5405-2019; High temperature acidification inhibitor SJ-1 is a mixed control inhibitor which can inhibit both cathode reaction and anode reaction. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chinese Mass Spectrometry Society is the property of Journal of Chinese Mass Spectrometry Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)