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Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region

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Science China Earth Sciences 2019年第4期62卷 619-630页

作者： Jiansen HE Die DUAN xingyu zhu Limei YAN Linghua WANG School of Earth and Space Sciences Peking University Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

The foreshock with nascent plasma turbulence is regarded as a fascinating region to understand basic plasma physical processes, e.g., wave-particle interactions as well as wave-wave couplings. Although there have been plenty of intensive studies on this topic, some key clues about the physical processes still lack observations. A relatively comprehensive case study with some new observations is presented in this work based on the WIND spacecraft observations. In this case, upstream energetic protons were drifting at tens of Alfvén speed with respect to the background plasma protons. When looking at the magnetic wave activities, we find the co-existence of high-frequency(0.1-0.5 Hz) large-amplitude right-hand polarized(RHP) waves and lowfrequency(0.02-0.1 Hz) small-amplitude left-hand polarized(LHP) waves in the spacecraft(SC) frame. The observed anticorrelation between magnetic and velocity fluctuations along with the sunward magnetic field direction indicates that the lowfrequency LHP waves in the SC frame are in fact the sunward upstream RHP Alfvénic waves in the solar wind frame. This new observation corroborates the applicability of theories about plasma non-resonance instability and inverse cascade to the foreshock region, where the downstream high-frequency RHP parent waves are excited by the upstream energetic protons through non-resonance instability and the low-frequency RHP daughter waves are generated by the parent waves due to nonlinear parametric instability. Furthermore, enhanced downstream energetic proton fluxes are inferred to result from scattering of the upstream protons by the nascent turbulent fluctuations. Therefore, some critical clues about the newborn turbulence in the foreshock are provided in this work.

关键词： Solar wind Foreshock Wave-particle interaction Parametric instability

Sentiment Analysis of Japanese Tourism Online Reviews

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Journal of Data and Information Science 2019年第1期4卷 89-113页

作者： Chuanming Yu xingyu zhu Bolin Feng Lin Cai Lu An School of Information and Safety Engineering Zhongnan University of Economics and Law School of Information Management Wuhan University

Purpose: Online reviews on tourism attractions provide important references for potential tourists to choose tourism spots. The main goal of this study is conducting sentiment analysis to facilitate users comprehending the large scale of the reviews, based on the comments about Chinese attractions from Japanese tourism website 4 ***/methodology/approach: Different statistics-and rule-based methods are used to analyze the sentiment of the reviews. Three groups of novel statistics-based methods combining feature selection functions and the traditional term frequency-inverse document frequency(TF-IDF) method are proposed. We also make seven groups of different rulesbased methods. The macro-average and micro-average values for the best classification results of the methods are calculated respectively and the performance of the methods are ***: We compare the statistics-based and rule-based methods separately and compare the overall performance of the two method. According to the results, it is concluded that the combination of feature selection functions and weightings can strongly improve the overall performance. The emotional vocabulary in the field of tourism(EVT), kaomojis, negative and transitional words can notably improve the performance in all of three categories. The rule-based methods outperform the statistics-based ones with a narrow *** limitation: Two limitations can be addressed: 1) the empirical studies to verify the validity of the proposed methods are only conducted on Japanese languages; and 2) the deep learning technology is not been incorporated in the *** implications: The results help to elucidate the intrinsic characteristics of the Japanese language and the influence on sentiment analysis. These findings also provide practical usage guidelines within the field of sentiment analysis of Japanese online tourism ***/value: Our research is of practicability. Currently, there are no stud

关键词： Sentiment analysis Japanese reviews Rule-based methods Statistics-based methods Tourism reviews

Mirror-like tongue is an important predictor of acute heart failure:a cohort study of acute heart failure in Chinese patients

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Journal of Traditional Chinese Medicine 2023年第6期43卷 1243-1251页

作者： CHEN Yunhu YIN Moqing FAN Lihua JIANG Xuechun ZHANG Tao zhu xingyu XU Hongfeng Department of Cardiology Taicang TCM Hospital Affiliated to Nanjing University of Chinese MedicineSuzhou 215400China Department of Cardiology Changzhou Hospital affiliated with Nanjing University of Chinese MedicineChangzhou 213003China Department of Clinical Pharmacy Taicang TCM Hospital Affiliated to Nanjing University of Chinese MedicineSuzhou 215400China

OBJECTIVE:To reveal that mirror-like tongue,observed via a noninvasive inspection,is a powerful indicator of the severity and prognosis of patients with acute heart failure(AHF).METHODS:This was an observational,prospective study.A total of 408 patients who met the inclusion criteria and were diagnosed with AHF for the first time at Taicang Traditional Chinese Medicine Hospital Affiliated to Nanjing University of Chinese Medicine from August 2019 to January 2021 were selected as the research *** to their tongue fur,the patients were divided into group A(mirror-like tongue group)and group B(non-mirror-like tongue group).The clinical characteristics and incidence of major adverse cardiovascular events(MACEs)within 1 year of follow-up were systematically compared between the two ***:Sixty-five patients were included in group A,and 343 patients were included in group *** were 32 males and 33 females in group A and 168 males and 175 females in group *** average age of the overall population was 64 years old,and the average age of group A was significantly higher than that of group B(74 vs 62 years,P<0.001).Compared with that in group B,the left ventricular ejection fraction(LVEF)in group A was significantly lower(35%vs 42%,P<0.001),and the log N-terminal pro B-type natriuretic peptide(NT-proBNP)level was significantly higher(4.0 vs 3.4,P<0.001).The proportion of the combined application of vasoactive drugs in group A was significantly higher than that in group B(64%vs 38%,P<0.001).Group B had a higher proportion of coronary angiography(29.5%vs 16.9%,P=0.038).Group A was more inclined to require mechanical ventilation than group B(33.9%vs 22.5%,P=0.049).The length of hospital stay in group A was significantly longer than that in group B(13.1 vs 7.6,P<0.001).The incidence of MACEs,such as recurrence of AHF,new myocardial infarction and stroke,in group A within one year was higher than that in group B(P=0.007,0.009,<0.001).The incidence of cu

关键词： heart failure risk factors fur Yin deficiency cohort studies

Highly integrated sulfur cathodes with strong sulfur/high-strength binder interactions enabling durable high-loading lithium-sulfur batteries

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Journal of Energy Chemistry 2020年第10期29卷 71-79页

作者： Arif Rashid xingyu zhu Gulian Wang Chengzhi Ke Sha Li Pengfei Sun Zhongli Hu Qiaobao Zhang Li Zhang College of Energy Soochow Institute for Energy and Materials InnovationsSoochow UniversitySuzhou 215006JiangsuChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

The development of high-sulfur-loading Li-S batteries is a key prerequisite for their commercial *** requires to surmount the huge polarization,severe polysulfide shuttling and drastic volume change caused by electrode ***-strength polar binders are ideal for constructing robust and long-life high-loading sulfur cathodes but show very weak interfacial interaction with non-polar sulfur *** address this issue,this work devises a highly integrated sulfur@polydopamine/highstrength binder composite cathodes,targeting long-lasting and high-sulfur-loading Li-S *** super-adhesion polydopamine(PD)can form a uniform nano-coating over the graphene/sulfur(G-S)surface and provide strong affinity to the cross-linked polyacrylamide(c-PAM)binder,thus tightly integrating sulfur with the binder network and greatly boosting the overall mechanical strength/conductivity of the ***,the PD coating and c-PAM binder rich in polar groups can form two effective blockades against the effusion of soluble *** such,the 4.5 mg cm−2 sulfur-loaded G-S@PD-c-PAM cathode achieves a capacity of 480 mAh g−1 after 300 cycles at 1 C,while maintaining a capacity of 396 mAh g−1 after 50 cycles at 0.2 C when the sulfur loading rises to 9.1 mg cm−*** work provides a system-wide concept for constructing high-loading sulfur cathodes through integrated structural design.

关键词： Cross-linked high-strength polar binder Highly integrated electrode structure High-sulfur-loading Li-S battery Polydopamine nano-bonding layer Strong sulfur/binder interaction

A model test on an open-cut tunnel structure under the effect of a stick-slip normal fault

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Railway Sciences 2022年第2期1卷 169-192页

作者： Zhiqiang Zhang xingyu zhu Ronghua Wei School of Civil Engineering Southwest Jiaotong UniversityChengduChina Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengduChina

Purpose–Large displacement misalignment under the action of active faults can cause complex threedimensional deformation in subway tunnels,resulting in severe damage,distortion and *** is no developed system of fortification and related codes to *** are scientific problems and technical challenges in this field that have never been encountered in past research and ***/methodology/approach–This paper adopted a self-designed large-scale active fault dislocation simulation loading system to conduct a similar model test of the tunnel under active fault dislocation based on the open-cut tunnel project of the Urumqi Rail Transit Line 2,which passes through the Jiujiawan normal *** test simulated the subway tunnel passing through the normal fault,which is inclined at *** research compared and analyzed the differences in mechanical behavior between two types of lining section:the opencut double-line box tunnel and the modified double-line box arch *** structural response and failure characteristics of the open-cut segmented lining of the tunnel under the stick-slip part of the normal fault were ***–The results indicated that the double-line box arch tunnel improved the shear and longitudinal bending *** cracks were mainly distributed in the baseplate,wall foot and arch foot,and the crack position was basically consistent with the longitudinal distribution of surrounding rock *** indicated that the longitudinal cracks were due to the large local load of the cross-section of the structure,leading to an excessive local bending moment of the structure,which resulted in large eccentric failure of the lining and formation of longitudinal *** with the ordinary box section tunnel,the improved double-line box arch tunnel significantly reduced the destroyed and damage areas of the hanging wall and *** damage area and crack length were reduced by 39 and 59.3%,respect

关键词： Normal fault Stick-slip Open-cut tunnel Model test Failure characteristics

Analyzing Differences between Online Learner Groups during the COVID-19 Pandemic through K-Prototype Clustering

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Journal of Data Analysis and Information Processing 2022年第1期10卷 22-42页

作者： Guanggong Ge Quanlong Guan Lusheng Wu Weiqi Luo xingyu zhu College of Cyber Security Jinan University Guangzhou China College of Information Science and Technology Jinan University Guangzhou China Institute of Smart Education of Guangdong Jinan University Guangzhou China Science and Technology Department of Jinan University Guangzhou China

Online learning is a very important means of study, and has been adopted in many countries worldwide. However, only recently are researchers able to collect and analyze massive online learning datasets due to the COVID-19 epidemic. In this article, we analyze the difference between online learner groups by using an unsupervised machine learning technique, i.e., k-prototypes clustering. Specifically, we use questionnaires designed by domain experts to collect various online learning data, and investigate students’ online learning behavior and learning outcomes through analyzing the collected questionnaire data. Our analysis results suggest that students with better learning media generally have better online learning behavior and learning result than those with poor online learning media. In addition, both in economically developed or undeveloped regions, the number of students with better learning media is less than the number of students with poor learning media. Finally, the results presented here show that whether in an economically developed or an economically undeveloped region, the number of students who are enriched with learning media available is an important factor that affects online learning behavior and learning outcomes.

关键词： Online Learning K-Prototypes Clustering Economically Developed Region Data Analysis Different Groups Learning Behavior Learning Media

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基于复合神经网络的多源气动数据建模

西北工业大学学报 2024年第2期42卷 328-334页

作者：朱星谕梅立泉西安交通大学数学与统计学院陕西西安710049

将深度学习方法应用至气动数据建模,能够解决传统建模方法效率低、代价高的问题,具有重要的现实意义。基于复合神经网络模型对多源气动数据进行学习,利用低精度数据辅助高精度数据进行预测。与不同网络模型进行对比,验证了文中提出的复... 详细信息

将深度学习方法应用至气动数据建模,能够解决传统建模方法效率低、代价高的问题,具有重要的现实意义。基于复合神经网络模型对多源气动数据进行学习,利用低精度数据辅助高精度数据进行预测。与不同网络模型进行对比,验证了文中提出的复合神经网络在气动数据建模中表现优良,且泛化能力较好。

关键词：气动数据建模深度神经网络复合神经网络

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均值二分法分块排序的正方化树图布局算法

计算机辅助设计与图形学学报 2015年第8期27卷 1451-1459页

作者：朱兴宇杜景林南京信息工程大学电子与信息工程学院南京210044

结合双向正方化布局思想,提出基于均值二分法快速分块排序的正方化树图布局算法.算法使用混乱阈值和均值二分法分割原始数据集,根据数据子集权值之和的比例关系对初始矩形进行分割,在每个矩形子块内用结合长边摆放策略的正方化自适应算... 详细信息

结合双向正方化布局思想,提出基于均值二分法快速分块排序的正方化树图布局算法.算法使用混乱阈值和均值二分法分割原始数据集,根据数据子集权值之和的比例关系对初始矩形进行分割,在每个矩形子块内用结合长边摆放策略的正方化自适应算法排列对应的数据子集中的元素.与前面2种算法进行比较的结果表明,文中算法能够有效地减少数据集分割和排序时间,解决Squarified-SP算法分割数据集存在的多种可能性问题,同时保证整个数据集一定的顺序性且提高了数据布局的稳定性.

关键词：树图均值二分法长边摆放正方化算法分块排序

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清代以降辽河中下游地区玉米种植变迁述论

农业考古 2023年第3期 68-77页

作者：朱星宇朱锁玲南京农业大学中华农业文明研究院南京农业大学人文与社会发展学院

玉米作为高产耐瘠薄的美洲作物,自清代以来,在辽河中下游地区就一直处于非常尴尬的“杂粮”的种植地位。但是清末以后,劳动力的大量涌入、大豆作物重要性的提高,促使玉米种植开启了从“园圃作物”向“主粮作物”过渡的趋势,辽河中下游... 详细信息

玉米作为高产耐瘠薄的美洲作物,自清代以来,在辽河中下游地区就一直处于非常尴尬的“杂粮”的种植地位。但是清末以后,劳动力的大量涌入、大豆作物重要性的提高,促使玉米种植开启了从“园圃作物”向“主粮作物”过渡的趋势,辽河中下游各县纷纷出现了玉米“大田化”趋势。但是,直至伪满政权覆灭,由于传统作物高粱具有一定的比较优势,玉米在辽河中下游地区的种植“大田化”趋势最终未能将玉米种植导向“地方食粮大宗”的地位。

关键词：清代以降辽河中下游玉米变迁