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GENERALIZED FORELLI-RUDIN TYPE OPERATORS BETWEEN SEVERAL FUNCTION SPACES ON THE UNIT BALL OF C^(N) 被引量:1
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作者 Xuejun ZHANG Yuting GUO +1 位作者 hongxin chen Pengcheng TANG 《Acta Mathematica Scientia》 SCIE CSCD 2024年第4期1301-1326,共26页
In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order t... In this paper,we investigate sufficient and necessary conditions such that generalized Forelli-Rudin type operators T_(λ,τ,k),S_(λ,τ,k),Q_(λ,τ,k)and R_(λ,τ,k)are bounded between Lebesgue type spaces.In order to prove the main results,we first give some bidirectional estimates for several typical integrals. 展开更多
关键词 Forelli-Rudin type operator L^(p q s k)(B_(n))space BOUNDEDNESS unit ball
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Anomalous valley Hall effect in two-dimensional valleytronic materials
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作者 陈洪欣 原晓波 任俊峰 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期2-14,共13页
The anomalous valley Hall effect(AVHE)can be used to explore and utilize valley degrees of freedom in materials,which has potential applications in fields such as information storage,quantum computing and optoelectron... The anomalous valley Hall effect(AVHE)can be used to explore and utilize valley degrees of freedom in materials,which has potential applications in fields such as information storage,quantum computing and optoelectronics.AVHE exists in two-dimensional(2D)materials possessing valley polarization(VP),and such 2D materials usually belong to the hexagonal honeycomb lattice.Therefore,it is necessary to achieve valleytronic materials with VP that are more readily to be synthesized and applicated experimentally.In this topical review,we introduce recent developments on realizing VP as well as AVHE through different methods,i.e.,doping transition metal atoms,building ferrovalley heterostructures and searching for ferrovalley materials.Moreover,2D ferrovalley systems under external modulation are also discussed.2D valleytronic materials with AVHE demonstrate excellent performance and potential applications,which offer the possibility of realizing novel low-energy-consuming devices,facilitating further development of device technology,realizing miniaturization and enhancing functionality of them. 展开更多
关键词 anomalous valley Hall effect valley polarization valleytronics two-dimensional materials
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H^(p,q,s)(D)上的复合算子
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作者 陈洪欣 张学军 周敏 《数学物理学报(A辑)》 CSCD 北大核心 2023年第1期1-13,共13页
设φ是复平面C中单位圆盘D上的解析自映射.该文刻画了一般Hardy型空间H^(p,q,s)(D)上使得复合算子Cφ有界或者紧时的符号函数φ.
关键词 复合算子 有界性 紧性 一般Hardy型空间 单位圆盘
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在线光纤OTDR检测中的一些关键问题 被引量:1
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作者 hongxin chen Michel Leblanc Olivier Plomteux 《电信科学》 北大核心 2008年第7期40-44,共5页
本文首先介绍了在线光纤检测的目的及需求,随后对如何利用OTDR进行在线光纤检测进行了实验说明,其中对受激拉曼散射对该测试的影响,测试中信号的衰减、失真情况进行了详细的分析。
关键词 在张光纤检测 光时域反射仪 受激拉曼散射
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积分估计和加权Lebesgue空间上广义Forelli-Rudin型算子的有界性 被引量:1
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作者 张学军 郭雨婷 陈洪欣 《中国科学:数学》 CSCD 北大核心 2023年第10期1357-1376,共20页
本文给出当p≥1时加权Lebesgue空间Lp(Bn,dvt)上广义Forelli-Rudin型算子Sλ,τ,c,k,k′有界的充要条件,部分推广了Zhao和Zhou(2022)的结果.同时,为了证明主要结果,本文给出球面和球体上几个积分的双向估计,推广了Rudin(1980)的相应结果.
关键词 广义Forelli-Rudin型算子 加权Lebesgue空间 积分估计 有界性
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Dangerous Driving Behavior Recognition and Prevention Using an Autoregressive Time-Series Model 被引量:5
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作者 hongxin chen Shuo Feng +2 位作者 Xin Pei Zuo Zhang Danya Yao 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2017年第6期682-690,共9页
Time headway is an important index used in characterizing dangerous driving behaviors. This research focuses on the decreasing tendency of time headway and investigates its association with crash occurrence. An autore... Time headway is an important index used in characterizing dangerous driving behaviors. This research focuses on the decreasing tendency of time headway and investigates its association with crash occurrence. An autoregressive(AR) time-series model is improved and adopted to describe the dynamic variations of average daily time headway. Based on the model, a simple approach for dangerous driving behavior recognition is proposed with the aim of significantly decreasing headway. The effectivity of the proposed approach is validated by means of empirical data collected from a medium-sized city in northern China. Finally, a practical early-warning strategy focused on both the remaining life and low headway is proposed to remind drivers to pay attention to their driving behaviors and the possible occurrence of crash-related risks. 展开更多
关键词 time headway driving behavior traffic safety autoregressive time-series model remaining life driving warning strategy
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Will Crash Experience Affect Driver’s Behavior? An Observation and Analysis on Time Headway Variation Before and After a Traffic Crash
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作者 Yun Yue Zi Yang +3 位作者 Xin Pei hongxin chen Chao Song Danya Yao 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2020年第4期471-478,共8页
Research into the impact of road accidents on drivers is essential to effective post-crash interventions.However,due to limited data and resources,the current research focus is mainly on those who have suffered severe... Research into the impact of road accidents on drivers is essential to effective post-crash interventions.However,due to limited data and resources,the current research focus is mainly on those who have suffered severe injuries.In this paper,we propose a novel approach to examining the impact that being involved in a crash has on drivers by using traffic surveillance data.In traffic video surveillance systems,the locations of vehicles at different moments in time are captured and their headway,which is an important indicator of driving behavior,can be calculated from this information.It was found that there was a sudden increase in headway when drivers return to the road after being involved in a crash,but that the headway returned to its pre-crash level over time.We further analyzed the duration of the decay using a Cox proportional hazards regression model,which revealed many significant factors(related to the driver,vehicle,and nature of the accident)behind the survival time of the increased headway.Our approach is able to reveal the crash impact on drivers in a convenient and economical way.It can enhance the understanding of the impact of a crash on drivers,and help to devise more effective re-education programs and other interventions to encourage drivers who are involved in crashes to drive more safely in the future. 展开更多
关键词 CRASH impact driving behavior TIME HEADWAY survival TIME COX proportional hazards model
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Composition operators on the normal weight Dirichlet type space in the unit disc
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作者 Xuejun ZHANG Min ZHOU hongxin chen 《Frontiers of Mathematics in China》 SCIE CSCD 2022年第4期545-552,共8页
Let p>0 andνbe a normal function on[0,1).In this paper,several equivalent characterizations are given for which composition operators are bounded or compact on the normal weight Dirichlet type space D_(ν)^(p)(D)i... Let p>0 andνbe a normal function on[0,1).In this paper,several equivalent characterizations are given for which composition operators are bounded or compact on the normal weight Dirichlet type space D_(ν)^(p)(D)in the unit disc. 展开更多
关键词 Composition operator normal weight Dirichlet type space BOUNDEDNESS COMPACTNESS unit disc
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