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Combinatorial reasoning-based abnormal sensor recognition method for subsea production control system

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Petroleum Science 2024年第4期21卷 2758-2768页

作者： Rui Zhang Bao-ping Cai Chao Yang Yu-Ming zhou Yong-Hong Liu Xin-Yang Qi College of Mechanical and Electronic Engineering China University of Petroleum BGP Inc. China National Petroleum Corporation

The subsea production system is a vital equipment for offshore oil and gas production. The control system is one of the most important parts of it. Collecting and processing the signals of subsea sensors is the only way to judge whether the subsea production control system is normal. However, subsea sensors degrade rapidly due to harsh working environments and long service time. This leads to frequent false alarm incidents. A combinatorial reasoning-based abnormal sensor recognition method for subsea production control system is proposed. A combinatorial algorithm is proposed to group sensors. The long short-term memory network(LSTM) is used to establish a single inference model. A counting-based judging method is proposed to identify abnormal sensors. Field data from an offshore platform in the South China Sea is used to demonstrate the effect of the proposed method. The results show that the proposed method can identify the abnormal sensors effectively.

关键词： Abnormal sensor Combinatorial algorithm Fault identification Subsea production control system

High Power GaN Doubler with High Duty Cycle Pulse Based on Local Non-reflection Design

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Chinese Journal of Electronics 2024年第5期33卷 1196-1203页

作者： Yazhou DONG Tianchi zhou Shixiong LIANG guodong GU Hongji zhou Jianghua YU Hailong guo Yaxin ZHANG School of Electronic Science and Engineering University of Electronic Science and Technology of China National Key Laboratory of Solid-State Microwave Devices and Circuits Hebei Semiconductor Research Institute

The study focuses on the development of gallium nitride(GaN) Schottky barrier diode(SBD) frequency doublers for terahertz technology. The low conversion efficiency of these doublers limits their practical applications. To address this challenge, the paper proposes a multi-objective local no-reflection design method based on a three-dimensional electromagnetic structure. The method aims to improve the coupling efficiency of input power and reduce the reflection of power output. Experimental results indicate that the proposed method significantly improves the performance of GaN SBD frequency doublers, achieving an efficiency of 16.9% and a peak output power of 160mW at 175 GHz. These results suggest that the method can contribute to the further development of GaN SBD frequency doublers for terahertz technology.

关键词： Couplings Schottky diodes Design methodology Schottky barriers Terahertz materials Power system harmonics Reflection Gallium nitride Frequency doubler Multi-objective optimization Local non-reflection design FREQUENCY DOUBLER RADAR

Chiral helically grooved gold nanoarrows for concurrently enhancing oxygen and hydrogen evolution from electrochemical water splitting

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Science China Chemistry 2024年第11期67卷 3767-3776页

作者： Lufei Huang Tao Wang Ying Li ping Wang Rui Tian Baowen zhou Lin Yao China-UK Low Carbon College Shanghai Jiao Tong University Electron Microscopy Laboratory School of Physics Peking University State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Key Laboratory for Power Machinery and Engineering of Ministry of Education Research Center for Renewable Synthetic FuelSchool of Mechanical Engineering Shanghai Jiao Tong University

Electrocatalytic water splitting shows a tremendous promise for storing green and intermittent electricity into storable fuels,paving a sustainable way toward carbon neutrality. The exploration of a bifunctional electrocatalyst for simultaneously enhancing oxygen evolution reaction and hydrogen evolution reaction is at the core yet remains a grand challenge, especially operated in the same electrolyte. In this work, mesoscale gold nanoarrows with special chiral morphology are synthesized for electrocatalytic water splitting. In the same electrolyte of 1 M KOH aqueous solution, the as-designed chiral R-/L-helically grooved gold nanoarrows（R-/L-heli GNAs） demonstrated significantly enhanced performance in both hydrogen evolution reaction and oxygen evolution reaction with overpotentials of 186 and 355 m V at 10 m A cm-2, respectively, compared to the achiral counterpart. For oxygen evolution reaction, the performance is even comparable to commercial notable metal catalysts,i.e., RuO2, of which the overpotential is 310 m V under the same measured conditions. The spin-polarized conductive atomic force microscope（c-AFM）, finite-difference time-domain simulation, in combination with electrochemical investigations, show that the chirality of R-/L-heli GNAs makes a substantial contribution toward the remarkable performance by enhanced electric field distribution for hydrogen evolution reaction and by tuning the spin states of the electrons for oxygen evolution *** study presents an encouraging strategy for simultaneously promoting hydrogen evolution reaction and oxygen evolution reaction that operated in the same electrolyte by imparting chirality toward a mesoscale inorganic electrocatalyst, showing a grand promise for opening up a new way for electrocatalytic water splitting toward green hydrogen.

关键词： chirality electron spin water splitting hydrogen evolution reaction oxygen evolution reaction

Omental fibroma combined with right indirect inguinal hernia masquerades as a scrotal tumor: A case report

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World Journal of Clinical Cases 2024年第5期12卷 988-994页

作者： ping zhou Chan-Hui Jin Ying Shi guo-Qing Ma Wen-Hao Wu Yu Wang Kun Cai Wu-Feng Fan Tian-Bao Wang Department of Gastrointestinal Surgery South China Hospital of Shenzhen UniversityShenzhen 518000Guangdong ProvinceChina

BACKGROUND The most common causes of scrotal enlargement in patients include primary tumor of the scrotum,inflammation,hydrocele of the tunica vaginalis,and indirect inguinal hernia;scrotal enlargement caused by external tumors of the scrotum is *** patient had both a greater omentum tumor and an inguinal hernia,and the tumor protruded into the scrotum through the hernia sac,which is even ***,omental tumors are mostly metastatic,and primary omental fibroma is *** SUMMARY Here,we report a rare case of a 25-year-old young man with scrotal enlargement and pain for 3 *** examination and multidisciplinary discu-ssions considered intra-abdominal tumor displacement and inguinal hernia,and intraoperative exploration confirmed that the greater omentum tumor protruded into the ***,tumor resection and tension-free inguinal hernia repair were *** final diagnosis was benign fibroma of the greater omentum accompanied by an indirect inguinal *** This unusual presentation of a common inguinal hernia disease illustrates the necessity of performing detailed history taking,physical examination,and imaging before surgery.

关键词： Hernia Indirect inguinal hernia Fibroma Omental tumor Scrotal tumor Greater omentum Case report

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连续酸洗过程控制数学模型开发与应用

钢铁 2017年第3期52卷 100-107页

作者：陈金山周国平河钢集团唐钢高强汽车板有限公司河北唐山063016

为了提高连续酸洗过程的稳定性和生产节奏,保证良好的酸洗表面质量,进行了酸洗功能模块及酸洗过程控制数学模型的研究与开发。基于统计学原理并利用Origin软件进行回归拟合,建立了酸洗过程实用的自由酸浓度模型、Fe^(2+)浓度模型和总酸... 详细信息

为了提高连续酸洗过程的稳定性和生产节奏,保证良好的酸洗表面质量,进行了酸洗功能模块及酸洗过程控制数学模型的研究与开发。基于统计学原理并利用Origin软件进行回归拟合,建立了酸洗过程实用的自由酸浓度模型、Fe^(2+)浓度模型和总酸浓度模型,有效提高了酸浓度的控制精度。同时,采用模糊控制和常规PID控制相结合的复合方法进行酸液温度控制,消除了温度控制过程的震荡和超调现象,大大提高了酸洗过程温度控制精度。实践证明,开发的酸洗过程控制数学模型计算精度高、可靠性强,完全满足多钢种、变规格条件下的汽车用高强钢生产对连续酸洗过程工艺控制的需求,适合于工业生产实践。

关键词：连续酸洗线速度温度浓度控制

Data-Driven Adaptive Predictive Control Method With Autotuned Weighting Factor for Nonlinear Systems Using Triangular Dynamic Linearization

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1880-1882页

作者： Zhong-Hua Pang Yumo Zhang Xueyuan Sun Shengnan Gao guo-ping Liu Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of TechnologyBeijing 100144China School of Data Science Capital University of Economics and BusinessBeijing 100070China Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

Dear Editor,In this letter,a novel data-driven adaptive predictive control method is proposed using the triangular dynamic linearization *** proposed method only contains one time-varying parameter with explicit physical meaning,which can prevent severe deviation in parameter ***,a triangular dynamic linearization(TDL)data model is employed to predict future system outputs,and then to correct inaccurate predictive outputs,a feedback regulator is *** autotuned weighing factor is introduced to alleviate the computational burden in practical applications and further improve output tracking ***-loop stability conditions are derived by rigorous *** results are provided to demonstrate the efficacy of the proposed method.

关键词： estimation technique method

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湖北官庄坪遗址动物遗骸研究报告

人类学学报 2005年第3期24卷 232-248页

作者：武仙竹周国平湖北省文物考古研究所武汉430077

长江三峡官庄坪遗址动物遗骸分属于新石器时代、东周时期和明代。新石器时代的重要动物遗骸包括大熊猫、大苏门羚、普氏野马等,其中大苏门羚是我国至今发现该种动物生存时代最晚的地点。官庄坪遗址明代动物骨骼中,有三峡地区引进型动物... 详细信息

长江三峡官庄坪遗址动物遗骸分属于新石器时代、东周时期和明代。新石器时代的重要动物遗骸包括大熊猫、大苏门羚、普氏野马等,其中大苏门羚是我国至今发现该种动物生存时代最晚的地点。官庄坪遗址明代动物骨骼中,有三峡地区引进型动物家黄牛。官庄坪遗址动物群的总体特征,反映三峡新石器时代以来具备高山—峡谷的立体气候自然景观。新石器时代至明代环境变化不大,峡谷以湿热、多林环境为主,峰顶区域则在气候、植被等自然环境方面有些改变。官庄坪遗址动物遗骸,反映三峡古居民对野生动物资源的依赖性较强。该遗址新石器时代墓葬中,存在随葬多种野生动物下颌骨的考古学文化现象,其中以大熊猫下颌骨作为随葬品,是世界范围内第一例。

关键词：大熊猫动物遗骸古代经济古环境官庄坪遗址长江三峡

In-situ SEM characterization of fracture mechanism of TiB/Ti-2Al-6Sn titanium matrix composites after electroshocking treatment

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Rare Metals 2024年第6期43卷 2805-2818页

作者： Ya-Ya Wu Jian zhou guo-Lei Han Yan Wen zhou Wang Li-Qiang Wang Wei-Jie Lv Le-Chun Xie Lin Hua Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this article,in-situ scanning electron microscope characterization of the tensile properties of TiB/Ti-2Al-6Sn titanium matrix composite(TMC)was conducted before and after electroshocking treatment(EST).After EST,the tensile strength increased by 113.2 *** effect of EST on the tensile strength and fracture behavior of TiB was investigated using in-situ characterization of the fracture morphology and crack propagation path of the matrix and *** EST,TiB fracture introduced cracks that extended into the matrix,resulting in material *** EST,the refined TiB improved the bearing capacity of the matrix,thereby improving TMC ***,after EST,the cracks were introduced into the matrix,and resulting the fracture of matrix *** an increase in the external load,cracks in the matrix were observed to propagate to TiB,and the refined TiB was fractured,detached,and pulled out,resulting in the formation of *** the propagation path of the main crack after EST showed that the deflection angle of the main crack *** micro structure of the fracture surface indicated that the fracture of the matrix was plastic,whereas that of TiB was *** EST,the size and area of the dimples increased,confirming the increase in *** results revealed that the comprehensive mechanical properties of TiB/Ti-2Al-6Sn improved after ***,EST is an efficient method for tailoring the micro structures and mechanical properties of TMCs.

关键词： TiB/Ti-2Al-6Sn In-situ microstructure characterization Tensile properties Reinforcement Electroshocking treatment(EST)

Deep-Ensemble Learning Method for Solar Resource Assessment of Complex Terrain Landscapes

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Energy Engineering 2024年第5期121卷 1329-1346页

作者： Lifeng Li Zaimin Yang Xiongping Yang Jiaming Li Qianyufan zhou ping Yang Energy Development Research Institute China Southern Power GridGuangzhou510000China Corporate Headquarters China Southern Power GridGuangzhou510000China Guangdong Green Energy Key Laboratory South China University of TechnologyGuangzhou510000China

As the global demand for renewable energy grows,solar energy is gaining attention as a clean,sustainable energy *** assessment of solar energy resources is crucial for the siting and design of photovoltaic power *** study proposes an integrated deep learning-based photovoltaic resource assessment *** learning and deep learning methods are fused for photovoltaic resource assessment for the first *** proposed method combines the random forest,gated recurrent unit,and long short-term memory to effectively improve the accuracy and reliability of photovoltaic resource *** proposed method has strong adaptability and high accuracy even in the photovoltaic resource assessment of complex terrain and *** experimental results show that the proposed method outperforms the comparison algorithm in all evaluation indexes,indicating that the proposed method has higher accuracy and reliability in photovoltaic resource assessment with improved generalization performance traditional single algorithm.

关键词： Photovoltaic resource assessment deep learning ensemble learning random forest gated recurrent unit long short-term memory