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Experimental investigation on electrical characteristics and ignition performance of multichannel plasma igniter

Chinese Physics B 2018年第3期27卷 327-334页

作者： Sheng-Fang Huang Hui-Min Song Yun Wu Min Jia Di Jin Zhi-Bo Zhang bing-xuan lin Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'an 710038China Science and Technology on Plasma Dynamics Laboratory Xi'an Jiaotong UniversityXi'an 710049China

Relighting of jet engines at high altitudes is very difficult because of the high velocity, low pressure, and low tempera- ture of the inlet airflow. Successful ignition needs sufficient ignition energy to generate a spark kernel to induce a so-called critical flame initiation radius. However, at high altitudes with high-speed inlet airflow, the critical flame initiation radius becomes larger; therefore, traditional ignition technologies such as a semiconductor igniter （SI） become infeasible for use in high-altitude relighting of jet engines. In this study, to generate a large spark kernel to achieve successful ignition with high-speed inlet airflow, a new type of multichannel plasma igniter （MCPI） is proposed. Experiments on the electrical char- acteristics of the MCPI and SI were conducted under normal and sub-atmospheric pressures （P = 10-100 kPa）. Ignition experiments for the MCPI and SI with a kerosene/air mixture in a triple-swirler combustor under different velocities of inlet airflow （60-110 m/s）, with a temperature of 473 K at standard atmospheric pressure, were investigated. Results show that the MCPI generates much more arc discharge energy than the SI under a constant pressure; for example, the MCPI generated 6.93% and 16.05 % more arc discharge energy than that of the SI at 30 kPa and 50 kPa, respectively. Compared to the SI, the MCPI generates a larger area and height of plasma heating zone, and induces a much larger initial spark kernel. Furthermore, the lean ignition limit of the MCPI and SI decreases with an increase in the velocity of the inlet airflow, and the maximum velocity of inlet airflow where the SI and MCPI can achieve successful and reliable ignition is 88.7 m/s and 102.2 m/s, respectively. Therefore, the MCPI has the advantage of achieving successful ignition with high-speed inlet airflow and extends the average ignition speed boundary of the kerosene/air mixture by 15.2%.

关键词： multichannel plasma igniter high-speed inlet airflow ignition energy ignition performance

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Wafer‑Scale Vertical 1D GaN Nanorods/2D MoS_(2)/PEDOT:PSS for Piezophototronic Effect‑Enhanced Self‑Powered Flexible Photodetectors

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Nano-Micro Letters 2025年第3期17卷 102-116页

作者： Xin Tang Hongsheng Jiang Zhengliang lin xuan Wang Wenliang Wang Guoqiang Li State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640People’s Republic of China Department of Electronic Materials School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China

van der Waals(vdW)heterostructures constructed by lowdimensional(0D,1D,and 2D)materials are emerging as one of the most appealing systems in next-generation flexible ***,hand-stacked vdW-type photodetectors are not compatible with large-areaarray fabrication and show unimpressive performance in self-powered ***,vertical 1D GaN nanorods arrays(NRAs)/2D MoS_(2)/PEDOT:PSS in wafer scale have been proposed for self-powered flexible photodetectors arrays *** as-integrated device without external bias under weak UV illumination exhibits a competitive responsivity of 1.47 A W^(−1)and a high detectivity of 1.2×10^(11)Jones,as well as a fast response speed of 54/71μs,thanks to the strong light absorption of GaN NRAs and the efficient photogenerated carrier separation in type-II ***,the strain-tunable photodetection performances of device have been ***,the device at−0.78%strain and zero bias reveals a significantly enhanced photoresponse with a responsivity of 2.47 A W^(−1),a detectivity of 2.6×10^(11)Jones,and response times of 40/45μs,which are superior to the state-of-the-art self-powered flexible *** work presents a valuable avenue to prepare tunable vdWs heterostructures for self-powered flexible photodetection,which performs well in flexible sensors.

关键词： Vertical nanorod arrays van der Waals heterostructure Piezophototronic effect Self-powered photodetection Flexible sensors

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舰船水压信号的预测方法研究

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数据采集与处理 2003年第2期18卷 222-225页

作者：张小兵玄兆林海军工程大学兵器工程系武汉430033

提出了一种能从海浪水压信号背景下提取舰船水压信号的预测异常检测 (PAD)方法。模型预测值与测量值相比较所得的差值被作为检测舰船水压信号是否存在的判据。讨论了作为 PAD中预测模型的线性的自回归(AR)模型和非线性的神经网络 (NN)模... 详细信息

提出了一种能从海浪水压信号背景下提取舰船水压信号的预测异常检测 (PAD)方法。模型预测值与测量值相比较所得的差值被作为检测舰船水压信号是否存在的判据。讨论了作为 PAD中预测模型的线性的自回归(AR)模型和非线性的神经网络 (NN)模型 ,并用模拟数据和实测数据对二者进行了比较。仿真结果表明 ,PAD效果良好 ,预测模型中 ,NN模型要优于 AR模型。

关键词：舰船水压信号预测方法神经网络 AR模型非线性预测异常检测法

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Automatic Detection and Repair Recommendation for Missing Checks

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Journal of Computer Science & Technology 2019年第5期34卷 972-992页

作者： ling-Yun Situ lin-Zhang Wang Yang Liu bing Mao xuan-Dong Li State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China Department of Computer Science and Technology Nanjing UniversityNanjing 210023China School of Computer Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Missing checks for untrusted inputs used in security-sensitive operations is one of the major causes of various vulnerabilities. Efficiently detecting and repairing missing checks are essential for prognosticating potential vulnerabilities and improving code reliability. We propose a systematic static analysis approach to detect missing checks for manipulable data used in security-sensitive operations of C/C++ programs and recommend repair references. First, customized securitysensitive operations are located by lightweight static analysis. Then, the assailability of sensitive data used in securitysensitive operations is determined via taint analysis. And, the existence and the risk degree of missing checks are assessed. Finally, the repair references for high-risk missing checks are recommended. We implemented the approach into an automated and cross-platform tool named Vanguard based on Clang/LLVM 3.6.0. Large-scale experimental evaluation on open-source projects has shown its effectiveness and efficiency. Furthermore, Vanguard has helped us uncover five known vulnerabilities and 12 new bugs.

关键词： static analysis missing check vulnerability detection repair recommendation

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Deep learning-based software engineering: progress,challenges, and opportunities

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Science China(Information Sciences) 2025年第1期68卷 57-144页

作者： Xiangping CHEN Xing HU Yuan HUANG He JIANG Weixing JI Yanjie JIANG Yanyan JIANG Bo LIU Hui LIU Xiaochen LI Xiaoli LIAN Guozhu MENG Xin PENG Hailong SUN lin SHI Bo WANG Chong WANG Jiayi WANG Tiantian WANG Jifeng xuan Xin XIA Yibiao YANG Yixin YANG Li ZHANG Yuming ZHOU Lu ZHANG School of Journalism and Communication Sun Yat-sen University School of Software Technology Zhejiang University School of Software Engineering Sun Yat-sen University School of Software Dalian University of Technology School of Computer Science and Technology Beijing Institute of Technology Key Laboratory of High Confidence Software Technologies (Peking University) Ministry of EducationSchool of Computer Science Peking University State Key Laboratory for Novel Software Technology Nanjing University School of Computer Science and Engineering Beihang University Institute of Information Engineering Chinese Academy of Sciences School of Computer Science Fudan University State Key Laboratory of Complex & Critical Software Environment (CCSE) School of Software Beihang University School of Computer and Information Technology Beijing Jiaotong University School of Computer Science and Technology Harbin Institute of Technology School of Computer Science Wuhan University Huawei Technologies

Researchers have recently achieved significant advances in deep learning techniques, which in turn has substantially advanced other research disciplines, such as natural language processing, image processing, speech recognition, and software engineering. Various deep learning techniques have been successfully employed to facilitate software engineering tasks, including code generation, software refactoring, and fault localization. Many studies have also been presented in top conferences and journals, demonstrating the applications of deep learning techniques in resolving various software engineering tasks. However,although several surveys have provided overall pictures of the application of deep learning techniques in software engineering,they focus more on learning techniques, that is, what kind of deep learning techniques are employed and how deep models are trained or fine-tuned for software engineering tasks. We still lack surveys explaining the advances of subareas in software engineering driven by deep learning techniques, as well as challenges and opportunities in each subarea. To this end, in this study, we present the first task-oriented survey on deep learning-based software engineering. It covers twelve major software engineering subareas significantly impacted by deep learning techniques. Such subareas spread out through the whole lifecycle of software development and maintenance, including requirements engineering, software development, testing, maintenance, and developer collaboration. As we believe that deep learning may provide an opportunity to revolutionize the whole discipline of software engineering, providing one survey covering as many subareas as possible in software engineering can help future research push forward the frontier of deep learning-based software engineering more systematically. For each of the selected subareas,we highlight the major advances achieved by applying deep learning techniques with pointers to the available datasets i

关键词： deep learning software engineering software benchmark software artifact representation survey

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Primary localized gastric amyloidosis:A scoping review of the literature from clinical presentations to prognosis

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World Journal of Gastroenterology 2021年第12期27卷 1132-1148页

作者： Xin-Yu lin Dan Pan Li-xuan Sang bing Chang Department of Neurology The First Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Department of Geriatrics The First Affiliated Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Department of Gastroenterology The First Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina

Localized gastric amyloidosis(LGA)is a rare disease characterized by abnormal extracellular deposition of amyloid protein restricted to the stomach and it is confirmed by positive results of Congo red *** decades,only a few cases have been reported and studies or research focusing on it are *** LGA has a low incidence,patients may suffer a lot from it and require proper diagnosis and ***,the pathology of LGA remains unknown and no overall review of LGA from its presentations to its prognosis has been *** with LGA are often asymptomatic or manifest atypical symptoms,making it difficult to differentiate from other gastrointestinal ***,we report the case of a 70-year-old woman with LGA and provide an overview of case reports of LGA available to *** on that,we conclude current concepts of clinical manifestations,diagnosis,treatment,and prognosis of LGA,aiming at providing a detailed diagnostic procedure for clinicians and promoting the guidelines of *** addition,a few advanced technologies applied in amyloidosis are also discussed in this review,aiming at providing clinicians with a reference of diagnostic *** this review,we hope to raise awareness of LGA among the public and clinicians.

关键词： Gastroscopy Changes of gastric mucosa Primary localized gastric amyloidosis Clinical presentations Prognosis

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Mitotic inheritance of DNA methylation: more than just copy and paste

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Journal of Genetics and Genomics 2021年第1期48卷 1-13页

作者： xuan Ming bing Zhu Yingfeng Lia National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

Decades of investigation on DNA methylation have led to deeper insights into its metabolic mechanisms and biological *** understanding was fueled by the recent development of genome editing tools and our improved capacity for analyzing the global DNA methylome in mammalian *** review focuses on the maintenance of DNA methylation patterns during mitotic cell *** discuss the latest discoveries of the mechanisms for the inheritance of DNA methylation as a stable epigenetic *** also highlight recent evidence showing the rapid turnover of DNA methylation as a dynamic gene regulatory mechanism.A body of work has shown that altered DNA methylomes are common features in aging and *** discuss the potential links between methylation maintenance mechanisms and diseaseassociated methylation changes.

关键词： DNMT1 Mitotic DNA methylation inheritance Neighboring reinforcement model Aging-associated methylation changes

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我国农产品流通效率时空演变、地区差异与收敛性

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经济问题 2025年第1期 100-112页

作者：高国生叶林祥支海兵南京财经大学粮食和物资学院江苏南京210003 南京审计大学金审学院管理学院江苏南京210023 南京财经大学经济学院江苏南京210003

农产品流通效率事关我国粮食安全和全国统一大市场的建成。运用熵值法测度了2011—2022年我国31个省级行政区的农产品流通效率,并使用Moran’s I、Kernel核密度估计、Markov链、Dagum基尼系数和β收敛模型分别分析了我国农产品流通效率... 详细信息

农产品流通效率事关我国粮食安全和全国统一大市场的建成。运用熵值法测度了2011—2022年我国31个省级行政区的农产品流通效率,并使用Moran’s I、Kernel核密度估计、Markov链、Dagum基尼系数和β收敛模型分别分析了我国农产品流通效率的时空演变、地区差异与收敛性情况。结果显示:研究期内我国农产品流通效率存在显著正向空间相关性,“高—高”集聚和“低—低”集聚特征明显;核密度曲线宽度变大呈现右拖尾和高度差明显的双峰形态,表明农产品流通效率逐渐提升,地区内部存在极化趋势;相邻省区市空间滞后水平对本省区市农产品流通效率维持原有状态或向更高水平发展均有较大影响;地区间差异是造成农产品流通效率总体差异显著的主要原因;农产品流通效率存在显著绝对β收敛和条件β收敛。据此,对如何提高农产品流通效率和缩小地区间差距提出了相关政策建议。

关键词：农产品流通效率时空演变空间分布地区差异

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Optimal policy for controlling two-server queueing systems with jockeying

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Journal of Systems Engineering and Electronics 2022年第1期33卷 144-155页

作者： lin bing lin Yuchen BHATNAGAR Rohit School of Business Jiangsu Normal UniversityXuzhou 221116China Wenzheng College Soochow UniversitySuzhou 215104China Nanyang Business School Nanyang Technological UniversityNanyang 639798Singapore

This paper studies the optimal policy for joint control of admission, routing, service, and jockeying in a queueing system consisting of two exponential servers in *** arrive according to a Poisson *** each arrival, an admission/routing decision is made, and the accepted job is routed to one of the two servers with each being associated with a *** each service completion, the servers have an option of serving a job from its own queue, serving a jockeying job from another queue, or staying *** system performance is inclusive of the revenues from accepted jobs, the costs of holding jobs in queues, the service costs and the job jockeying *** maximize the total expected discounted return, we formulate a Markov decision process(MDP) model for this *** value iteration method is employed to characterize the optimal policy as a hedging point *** studies verify the structure of the hedging point policy which is convenient for implementing control actions in practice.

关键词： queueing system jockeying optimal policy Markov decision process(MDP) dynamic programming

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Image Analysis by Two Types of Franklin-Fourier Moments

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IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 1036-1051页

作者： bing He Jiangtao Cui Bin Xiao xuan Wang the School of Computer Science and Technology Xidian UniversityXi’an 710071China the School of Physics and Electrical Engineering WeiNan Normal UniversityWeinan 714000China the Key Laboratory of Computational Intelligence Chongqing University of Posts and TelecommunicationsChongqing 400065China the School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

In this paper,we first derive two types of transformed Franklin polynomial:substituted and weighted radial Franklin *** radial orthogonal moments are proposed based on these two types of polynomials,namely substituted Franklin-Fourier moments and weighted Franklin-Fourier moments(SFFMs and WFFMs),which are orthogonal in polar *** radial kernel functions of SFFMs and WFFMs are transformed Franklin functions and Franklin functions are composed of a class of complete orthogonal splines function system of degree ***,it provides the possibility of avoiding calculating high order polynomials,and thus the accurate values of SFFMs and WFFMs can be obtained directly with little computational *** and experimental results show that Franklin functions are not well suited for constructing higher-order moments of SFFMs and WFFMs,but compared with traditional orthogonal moments(e.g.,BFMs,OFMs and ZMs)in polar coordinates,the proposed two types of Franklin-Fourier Moments have better performance respectively in lower-order moments.

关键词： Franklin functions image reconstruction moment invariants object recognition orthogonal moments

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