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奥氏体不锈钢在油脂设备中应用广泛，为高效、低成本地获得稳定、高质量的奥氏体不锈钢焊缝，在等离子弧焊+氩弧焊（PAW+TIG）组合焊基础上，提出PAW填丝打底焊+TIG脉冲盖面焊的改进PAW+TIG组合焊工艺，以5 mm厚的S30408不锈钢为例进行焊接试验，通过无损检测、拉伸试验、弯曲试验对焊缝进行检测，并梳理了改进PAW+TIG组合焊工艺实施要素。结果表明，改进PAW+TIG组合焊焊缝的外观良好，未出现焊接变形，各项性能满足工艺要求，焊接速度提升明显。采用该工艺对不锈钢进行焊接能延长油脂设备使用寿命，有效降低工程项目的消耗指标。Austenitic stainless steel is widely used in oils and fats equipment. In order to obtain stable and high-quality austenitic stainless steel welds with high efficiency and low cost, on the basis of combined plasma arc welding(PAW)+tungsten inert gas(TIG) welding, the improved PAW+TIG combined welding process of PAW backing welding with filler wire +TIG pulsed welding to cover weld face was put forward. The S30408 stainless steel with 5 mm thickness was taken as an example for welding test, and the weld was tested by non-destructive test, tensile test and bending test. In addition the implementation factors of improved PAW+TIG combined welding process were summarized. The results showed that the appearance of the weld obtained by the improved PAW+TIG combined welding process was good with no welding deformation, the performance met the requirements of the process, and the welding speed was effectively improved. Applying the welding process to weld stainless steel could extend the life of oils and fats equipment and effectively reduce consumption indicators of engineering projects.

为提高植物来源神经酸的产量和促进神经酸产品的研究开发及利用，从神经酸的植物来源、生理功效、提取及纯化工艺以及检测方法4个方面进行综述。植物中神经酸来源以木本植物居多；神经酸具有控制心血管疾病、改善血糖、改善大脑功能、修复中枢神经系统损伤、提高免疫力、抑制肿瘤细胞生长等生理功效；常采用低温结晶、金属盐沉淀、尿素包合、分子蒸馏等方法对神经酸进行提取纯化，采用气相色谱和高效液相色谱等检测方法检测神经酸含量。In order to increase the production of plant-derived nervonic acid (NA) and promote the research development and utilization of NA products, the plant source, physiological efficacy, extraction and purification process, and detection methods of NA were reviewed. Woody plants are the main source of NA in plants. NA has physiological efficacies such as controlling cardiovascular diseases, improving glucose, improving brain function, repairing central nervous system damage, enhancing immunity, and inhibiting tumor cell growth. The extraction and purification of NA is usually carried out by low temperature crystallization, metal salt precipitation, urea inclusion and molecular distillation. The NA content is detected by gas chromatography and high-performance liquid chromatography,etc..

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower 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 Food Research & Development is the property of Food Research & Development 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.)

: Obstacles have posed a great challenge to the unmanned working vessel in the crab pond. Once the obstacles appear on the route of the unmanned working vessel, it is easy to collide with the vessel. It is very necessary to quickly identify and locate the obstacles in the crab pond, in order to improve the efficiency and safety of the unmanned working vessel. In this study, an improved YOLOv5s model was proposed to detect the obstacles in the crab pond. The obstacles were then located to combine with the depth camera. Firstly, the lightweight network ShuffleNetV2 was used as the backbone feature extraction network, and the depth-separable convolution and channel mixing strategies were adopted to greatly reduce the model volume, in order to accelerate the detection speed for high accuracy. Secondly, the SE attention mechanism was introduced to enhance the feature perception of obstacles in the crab pond, particularly without increasing the amount of computation. Thirdly, the SPPF module was improved into the SPPFCSPC module. The target features were extracted under different receptive fields, in order to enhance the detection of obstacles in crab ponds at different scales. Finally, the SIoU loss function was adopted to further accelerate the model convergence for high accuracy. According to the color images obtained by the RealSense D435i depth camera, the obstacle was detected to locate the pixel coordinates of the center point of the obstacle in the coordinate system of the crab pond using coordinate conversion. The width of the obstacle was obtained simultaneously. The experimental results showed that the better recognition of the improved model was achieved in the pole, tarp, and aerator, where the confusion matrix output was observed by the model on the test set. The number of parameters and calculation amount of the improved YOLOv5s model were reduced by about 62.8% and 80.0% respectively, compared with the original. The model size was only 5.5 MB, and the volume was reduced by about 61.8%. The detection speed increased by 44.5%, and the inference speed of a single image reached 15.2 ms, where the mean average precision reached 93.3% for obstacles in the crab pond. Compared with the YOLOv5s-MobileNetV2, YOLOv5s-GhostNet, YOLOv7 and YOLOv8, the improved model had maintained the best balance in terms of parameter number, computation amount, detection speed and detection accuracy. A series of positioning and width measurement tests were conducted to verify the location accuracy of the improved model. Three typical obstacles were located in a crab pond at the fishery Science and Technology Demonstration base in Jintan District, Changzhou, Jiangsu Province. The test results showed that the average absolute error and average relative error of the distance between the three types of obstacles and the camera were 0.16 m and 2.26% in the range of 2-10 m, respectively, and the maximum absolute error and maximum relative error were 0.35 m and 3.74%, respectively. The width measurement errors of the pole, crab trap and aerator were concentrated in 0-0.05 m,-0.05-0.13 m and 0.01-0.19 m, respectively. The average errors were 0.03, 0.05 and 0.10 m, respectively, and the average relative errors were 34.1%, 7.5% and 5.0%, respectively. Finally, the depth camera was fixed in the front of the unmanned working vessel, in order to detect the three types of obstacles in the crab pond several times. The detection and positioning effects of the model were verified in the actual crab pond environment. The improved model was used to successfully detect the obstacles, in order to export the category, confidence, three-dimensional coordinate and width information. In summary, the improved model can fully meet the requirements to detect and locate the common obstacles in the crab pond environment. The finding can provide an important reference for the autonomous obstacle avoidance and cruise operation of the unmanned working vessel. [ABSTRACT FROM AUTHOR]

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.)

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腹壁年轻化发展至今, 在技术层面已趋于成熟, 腹壁整形主要的治疗手段包括脂肪抽吸术与腹壁整形术, 或者两 种技术的联合。而在传统的腹壁整形术中脐整形术的理念也在逐渐更新, 形成了许多术式的改良, 在重建天然与仿生的脐部形 态中, 进一步提高了患者的满意度。现对腹壁整形术的进展作一综述。 [ABSTRACT FROM AUTHOR]

Copyright of Oilfield Chemistry is the property of Sichuan University, Oilfield Chemistry 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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Taking the intermediate-acid volcanic rocks of the Songling Formation originally identified as the Early Jurassic in eastern Guangdong as the research object, a systematic chronology and isotopic analysis of U-Pb zircon are carried out. The result shows that the three volcanic rocks in the lower part of the Songling Formation were formed at 204-200 Ma. Therefore, the continuous Late Mesozoic volcanism in South China can bring temporally forward to Late Triassic. All three volcanic samples show depleted zircon Hf isotopic compositions, with εHf(t) values varying between +9. 2 - +5. 7, +5. 7 - +2. 2 and +10. 0 - +2. 9, respectively. It suggests that the volcanic rocks were derived by partial melting of the Paleoproterozoic crustal basement, with obvious depleted mantle-derived involvement. According to the results of previous studies, the contribution of depleted mantle-derived materials in the genesis of Late Mesozoic volcanic rocks in eastern Guangdong gradually weakened from the Late Triassic to the Middle Jurassic, but then gradually strengthened. The magmatic activities since the Late Jurassic in South China records late-stage subduction, and magmatism before Middle Jurassic is the induced result of the early-stage subduction of the paleo-Pacific plate. The Late Triassic volcanic rocks in South China identified in this research imply that the paleo-Pacific subduction was initiated in Late Triassic. [ABSTRACT FROM AUTHOR]

Copyright of Journal of South-Central Minzu University (Natural Science Edition) is the property of Journal of South-Central Minzu University (Natural Science Edition) 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.)

Aiming at the current hand pose estimation which doesn’t fully use 2D information to assistance 3D hand mesh reconstruction, this paper further introduced HOG feature of the RGB image based on the use of hand Mask and 2D heatmaps. This paper designed the framework of multi task learning CNN to extract the 2D information, and used the topology of the hand to fused the relevant information. In order to solve two problems: the consistency of hidden Embeddings dimensions in Transformer Encoder as well as requires heavy computational resources, the model introduced a new MLP (Multi-Layer Perception) module into transformer encoder to increase the length of Embeddings and decrease the dimensions of Embeddings, thereby the hand Mesh was completed in the way from coarse to fine. The new method proposed in this paper has achieves better results in two Frei-HAND and RHD datasets. [ABSTRACT FROM AUTHOR]

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Cold production-viscosity reduction technology is one of the dominant recovery ways for heavy oil with low viscosity. In this work, an amphipathic bentonite HMBent was synthesized by hydrophobic modification from the esterification reaction of silicon hydroxyl and polyethylene-graft-maleic anhydride. The inherent electric double layer structure, high thermostability and distinguished reinforcing performance of HMBent endowed the O/W emulsion with largely strengthened salt tolerance, thermal tolerance and shear resistance. Simultaneously, surfactivity-enhanced HMBent made the flooding fluid be of emulsifying ability and mechanical robustness, thus improving viscosity-reducing and displacing efficiency, also with the viscosity reduction ratio and oil recovery up to 97.35% and 73.6% respectively. [ABSTRACT FROM AUTHOR]

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental 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.)

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Objective To observe clinical effect of transurethral columnar balloon dilatation of the prostate combined with Holmuim laser for the treatment of bladder neck contracture. Methods A total of 46 patients with BNC who were treated by transurethral columnar balloon dilatation of the prostate in our hospital from Jan. 2020 to Jul. Patients were divided into two groups according to the methods of surgery. The admission, operation and discharge of all patients were completed in 24 hours. Clinic parameters such as IPSS,Qmax, QOL and PVR were recorded. Results All the patients underwent operations successfully. The symptoms of all patients were significantly relieved compared with those before surgery. Urinary parameters (IPSS, Qmax, and PVR) in TUCBDP combined with holmium laser at 6 months after surgery were significantly better than those in the holmium laser group alone(P<0.05). There were 2 case of stress urinary incontinence in both groups within half a year after operation. In the holmium laser group, there were 4 patients with BNC recurrence in 6 months of follow-up after surgery. Conclusion Transurethral columnar balloon dilatation of the prostate combined with Holmium can effectively treat BNC, with simple performance and satisfactory clinical effects. It is a minimally invasive treatment that is worthy of the popularization of day-surgery. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Shanghai Jiaotong University (Medical Science) is the property of Journal of Shanghai Jiaotong University (Medical Science) 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 Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao 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 Telecommunications Science is the property of Beijing Xintong Media 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 New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials 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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