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Gastric tube placement is a common clinical procedure. During the catheterization process, the gastric tube may enter the trachea by mistake, presenting symptoms such as choking, dyspnea, cyanosis and so on. Occasionally, patients have atypical symptoms, which are easily ignored in clinical practice, bringing great safety risks to the operation. This paper reported a case of gastric tube misplacement into the trachea using tetracaine gel as lubricant before gastrointestinal surgery, analyzed the causes and summarized the preventive and nursing measures, and reviewed the new methods, new techniques and relatively rare complications of gastric tube placement. The lubricant with anesthetic effect should be used carefully when placing gastric tube. The application of new technology can improve the success rate of gastric tube placement. (安置胃管是常见的临床操作。在置管过程中, 胃管可能会误入气管, 表现为呛咳、呼吸困难、发绀等症状, 偶有患者症状不典型, 存在安全隐患。现报告1例应用丁卡因胶浆置管过程中胃管误入气管且无典型症状的病例, 分析原因并总结预防护理措施, 并结合文献对安置胃管的新方法、新技术及相对罕见的并发症进行总结。 安置胃管时使用带有麻醉作用的润滑剂需谨慎, 新技术的应用可提高安置胃管的成功率。)

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 Xi'an Jiaotong University is the property of Editorial Office of Journal of Xi'an Jiaotong University 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 Geology & Exploration is the property of Geology & Exploration 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 Technology of Water Treatment is the property of Technology of Water Treatment 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 Science Technology & Engineering is the property of Chinese Society of Technology Economics 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 Tobacco Science & Technology is the property of Tobacco Science & Technology 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 Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics 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.)

To improve the tracking performance of intelligent vehicle, a lateral controller based on LQR theory and a longitudinal controller based on sliding mode theory were proposed to meet the requirements of tracking accuracy and stability in this paper. Firstly, a feedforward LQR controller was established based on 2-DOF (two degree of freedom) dynamics model. To solve the problem of feedforward LQR controller stability reduce caused by model linearization, a real-time velocity-road curvature fuzzy adaptive prediction LQR controller combined with CRTV model was established. In addition, to improve the stability and tracking accuracy of longitudinal velocity, a longitudinal tracking controller was proposed based on SMC(sliding mode control) theory. To verify the proposed controller, co-simulation and HIL (hardware in loop) experiment were conducted. The results show that the proposed controller combines tracking accuracy and stability. The tracking performance is significantly improved. [ABSTRACT FROM AUTHOR]

Copyright of China Rubber Industry is the property of Editorial Office of China Rubber Industry 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 Acta Prataculturae Sinica is the property of Acta Prataculturae 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.)

Copyright of Feed Industry is the property of Liaoning Provincial Institute of Agricultural Mechanization 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 Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics 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.)

The effect of each component and its additive amount（mass fraction/%） on the fire resistance of waterborne epoxy resin intumescence fire retardant coating were studied. For intumescent flame retardant（IFR）: the orthogonal experiment of ammonium polyphosphate（APP）, mela mine（MEL）, pentaerythritol（PER） and the single factor variable experiment of expanded graphite（EG） were carried out. TG-DTG, DSC and FT-IR were used to analyze and study the thermal stability of fire retardant coating and the composition of the carbon layer after combustion, and the optimized fire retardant coating formula was obtained. The results show that the waterborne epoxy resin（m（E51）∶m（E20）=3∶2） was used as the film for ming material, when the additive amounts of intumescent flame retardant and expanded graphite were 26%（APP）, 12%（MEL）, 10%（PER） and 4%（EG）, respectively, the ultimate refractory time of the coating reached 31.7 min, the expansion rate was 11.7, and the expanded carbon layer was complete and dense. The temperature corresponding to the maximum decomposition rate of fire retardant coating is 331.4 ℃, the intumescent flame retardant in 200-350 ℃ to complete the decomposition, 800 ℃ residual carbon content is 49.9%, mainly composed of polyaromatic rings, phosphate organic compounds and titanium pyrophosphate inorganic compounds. The addition of titanium dioxide, magnesium hydroxide and mineral fiber can effectively improve the fire resistance and the strength of the expanded carbon layer. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology 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 Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics 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 Clean Coal Technology is the property of Clean Coal Technology 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 Ordnance Equipment Engineering is the property of Chongqing University of Technology 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 Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology 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 Drilling Fluid & Completion Fluid is the property of Drilling Fluid & Completion Fluid 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.)

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Copyright of Journal of National University of Defense Technology / Guofang Keji Daxue Xuebao is the property of NUDT Press 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 Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica 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 Nonferrous Metals (Mining Section) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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.)

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Copyright of Journal of Jilin University (Science Edition) / Jilin Daxue Xuebao (Lixue Ban) is the property of Zhongguo Xue shu qi Kan (Guang Pan Ban) Dian zi Za zhi She 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.)

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Copyright of Practical Pharmacy & Clinical Remedies is the property of Editorial Department of Practical Pharmacy & Clinical Remedies 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 Advanced Engineering Science / Gongcheng Kexue Yu Jishu is the property of Advanced Engineering Science 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences 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 provide experience for clinical operation, we compared the clinical indexes of different thoracoscopic operation methods in the treatment of early non-small cell lung cancer after radical operation. Method : From January 2017 to December 2019, a total of 100 patients with early non-small cell lung cancer who underwent radical resection of lung cancer in our hospital were collected. Single hole thoracoscopy (40 cases), two hole thoracoscopy (32 cases) and three hole thoracoscopy (28 cases) were used,and compared the intraoperative and postoperative indicators of the three groups. Results :The intraoperative blood loss and postoperative thoracic drainage in the single hole group were significantly less than those in the two hole group and the three hole group (P<0.05), while those in the two hole group were significantly less than those in the three hole group (P<0.05); the postoperative chest tube indwelling time and postoperative hospital stay in the single hole group were shorter than those in the two hole group and the three hole group (P<0.05), while those in the two hole group were significantly shorter than those in the three hole group (P<0.05). The pain score at postoperative 24h of the three groups was lower than postoperative 12h, and postoperative 48h lower than postoperative 24h, the difference was statistically significant (P<0.05). The results showed that the pain score of single hole group was lower than that of two hole group and three hole group (P<0.05), while two hole group was lower than three hole group (P<0.05). There was no significant difference in the number of lymph nodes, the number of lymph node stations and the incidence of postoperative complications between three groups (P>0.05). Conclusion : Compared with two hole and three hole thoracoscopic surgery, single hole thoracoscopic surgery for early non-small cell lung cancer has obvious advantages,and does not significantly increase postoperative complications, so it can be used as the clinical first choice. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology 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.)

In-pond raceway system (IPRS) that was introduced from the United States by American Soybean Association in 2014, and it has been rapidly applied in recent years. It has realized the transformation of aquaculture model from traditional low-efficiency culture to high efficient culture. Many problems that limit the further integration of aquaculture management have not been studied in depth due to the short application time. In order to explore the distribution of flow field of raceway and the solid phase distribution characteristics of waste settling zone in the culture unit of in-pond raceway system, in this study, the data were simulated by dense discrete phase model (DDPM) based on computational fluid dynamics (CFD) and then were analyzed to form the liquid phase velocity contours, liquid phase velocity path lines and solid-phase distribution characteristics. Firstly, the mesh of culture units was constructed by ICEMCFD software. Secondly, the velocity of flow and nine groups of total suspended solids with different particle sizes were simulated with DDPM using numerical simulation software of FLUENT. In this simulation, the boundary condition of the air inlet was set to the speed, and the other exits were regarded as the pressure outlet. Three-dimensional n-s equation and uncoupled implicit scheme were used for discretization using finite volume method. A three-dimensional equation and a non-coupling implicit scheme discretized by a finite volume method was used, a standard k-ε two-equation turbulence model was selected, and a phase coupled SIMPLE algorithm was used as a numerical solution method in the separation pressure correction method in this study. The default standard format was selected in the pressure term of the velocity correction equation. The standard format, the diffusion term, the source term, and the convection term were all separated by a first-order upwind difference format. The velocity distribution of raceway in culture unit was detected by current meter, and the image for particle deposition in waste settling zone was scanned by a sonar scanning imager. The root mean square error (RMSE) between simulated value and measured value was 0.013 m/s. The water flow in raceway was in a slow-flow state. The high-speed flow field in the water surface area was pushed by the gravity and inertia along the length of raceway from the liquid surface to the bottom and then tended to be stable after reaching the bottom. During the sweeping process, the water flow formed an inherent backflow region between the front retaining wall and the bottom of raceway and the characteristic length of the backflow region was linear with the average flow velocity of the water inlet. The solid phase particles moved with the flow field along inside wall on both sides of the raceway. The solid phase particles were deposited in a U-shape after entering the waste settling zone which corresponding to each raceway. The deposition ratio of solid particles larger than 1.3 mm was over 85%, while the deposition ratio of solid particles smaller than 0.6 mm was less than 44.13%, and the total deposition ratio was 37.77%. The study showed that the influence of the design of the in-pond raceway system on the solid-phase particle deposition can be evaluated preliminarily by using DDPM, the deposition effect of waste settling zone on solid particles smaller than 0.6 mm in diameter was not ideal in this system. [ABSTRACT FROM AUTHOR]