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Search Results: 1 - 10 of 34516 matches for " Yueming Lu "
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Asymmetric electron energy sharing in strong-field double ionization of helium
Yueming Zhou,Qing Liao,Peixiang Lu
Physics , 2010, DOI: 10.1103/PhysRevA.82.053402
Abstract: With the classical three-dimensional ensemble model, we have investigated the microscopic recollision dynamics in nonsequential double ionization of helium by 800 nm laser pulses at 2.0 PW/cm^2. We demonstrate that the asymmetric energy sharing between the two electrons at recollision plays a decisive role in forming the experimentally observed V-shaped structure in the correlated longitudinal electron momentum spectrum at the high laser intensity [Phys. Rev. Lett. 99, 263003 (2007)]. This asymmetric energy sharing recollision leaves footprints on the transverse electron momentum spectra, which provide a new insight into the attosecond three-body interactions.
The Role of Nuclear Coulomb Attraction in Nonsequential Double Ionization of Argon Atom
Qing Liao,Yueming Zhou,Peixiang Lu
Physics , 2010,
Abstract: The role of nucleus in strong-field nonsequential double ionization of Ar atoms is investigated using three-dimensional classical ensembles. By adjusting the nuclear Coulomb potential, we can excellently reproduce the experimental correlated electron and ion momentum spectra with laser intensities above the recollision threshold [Phys. Rev. Lett. 93, 263001 (2004)] and below the recollision threshold [Phys. Rev. Lett. 101, 053001 (2008)] quantitatively. Analysis reveals the detailed electronic dynamics when the nuclear Coulomb attraction plays a key role in the recollision process of nonsequential double ionization of Ar atoms. Comparison between our results for Ar and those for He shows that atom species have a strong influence on nonsequential double ionization.
Analysis of Geographical Distribution of Missing Children Based on the Missing Children Mobile GIS Mutual Assistance System of China  [PDF]
Xiaodong Gong, Hao Cheng, Lu Yang, Yueming Duan, Yuan Yao, Yafei Feng, Le Fu, Jianhua Liu, Mingyi Du
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.512009
Abstract: The Missing Children Mobile GIS Mutual Assistance System of China (MCMAS) is a mobile service software based on mobile GIS platform software, and it is committed to providing the most convenient and efficient system of personally mutual tracing services for missing children family and society. Relying on collaborative utilization of location-based service technology, face image intelligent recognition technology, cloud computing technology, public big data sharing technology, and mobile GIS technology, the MCMAS has achieved prominent application effects since it was deployed. At present, the MCMAS is running soundly, and it has received and released the information about 1011 missing children from May 25, 2016 to May 25, 2017. In order to explore the geographical distribution features and the influencing factors of missing children, the data of missing children are used for spatial and visual analysis by the data mining and GIS technologies. At the same time, we have built the spatial thermodynamic diagram of the big data of China missing children. By comparing provinces and cities with a higher proportion of missing children, the results showed that: 1) The high proportion of missing children spatially concentrated in the eastern part of the China. 2) The number of missing children was significantly correlated with the population density and economic status of the city. Furthermore, the paper macro-levelly presents a basic basis for rescuing the missing children from two aspects: regionally spatial characteristics and influencing factors.
Classical simulations including electron correlations for sequential double ionization
Yueming Zhou,Cheng Huang,Qing Liao,Peixiang Lu
Physics , 2012, DOI: 10.1103/PhysRevLett.109.053004
Abstract: With a classical ensemble model that including electron correlations during the whole ionization process, we investigated strong-field sequential double ionization of Ar by elliptically polarized pulses at the quantitative level. The experimentally observed intensity-dependent three-band or four-band structures in the ion momentum distributions are well reproduced with this classical model. More importantly, the experimentally measured ionization time of the second electrons [A. N. Pfeiffer et al., Nature Phys. 7, 428 (2011)], which can not be predicted by the standard independent-electron model, is quantitatively reproduced by this fully classical correlated model. The success of our work encourages classical description and interpretation of the complex multi-electron effects in strong field ionization where nonperturbative quantum approaches are currently not feasible.
Reply on the comment on "Classical Simulations Including Electron Correlations for Sequential Double Ionization"
Yueming Zhou,Cheng Huang,Qing Liao,Peixiang Lu
Physics , 2013,
Abstract: This is a Reply on the proceeding comment on our paper titled "Classical Simulations Including Electron Correlations for Sequential Double Ionization".
Multiphoton Rabi Oscillations of Correlated Electrons in Strong Field Nonsequential Double Ionization
Liao Qing,Zhou Yueming,Huang Cheng,Lu Peixiang
Physics , 2011,
Abstract: With quantum calculations, we have investigated the multiphoton nonsequential double ionization of helium atoms in intense laser fields at ultraviolet wavelengths. Very surprisingly, we find a so-far unobserved double-circle structure in the correlated electron momentum spectra. The double-circle structure essentially reveals multiphoton Rabi oscillations of two electrons, which are strongly supported by the oscillating population of a certain doubly excited state and by the oscillating double ionization signals. This two-electron multiphoton Rabi effect provides profound understandings of electronic correlations and complicated multiphoton phenomena and is expected to be a new tool for broad applications, such as quantum coherent control.
BER Analysis of Decision-Feedback Multiple Symbol Detection in Noncoherent MIMO Ultra-Wideband Systems
Taotao Wang,Tiejun Lv,Hui Gao,Yueming Lu
Computer Science , 2013,
Abstract: In this paper, we investigate noncoherent multiple-input multiple-output (MIMO) ultra-wideband (UWB) systems where the signal is encoded by differential space-time block code (DSTBC). DSTBC enables noncoherent MIMO UWB systems to achieve diversity gain. However, the traditional noncoherent symbol-by-symbol differential detection (DD) for DSTBC-UWB suffers from performance degradation compared with the coherent detection. We introduce a noncoherent multiple symbol detection (MSD) scheme to enhance the performance of DSTBC-UWB system. Although the MSD scheme can boost the performance more as the observation window size gets to larger, the complexity of the exhaustive search for MSD also exponentially increases in terms of the window size. To decrease the computational complexity, the concept of decision-feedback (DF) is introduced to MSD for DSTBC-UWB in this paper. The resultant DF-MSD yields reasonable complexity and also solid performance improvement. We provide the bit error rate (BER) analysis for the proposed DF-MSD. Both theoretical analysis and simulation results validate the proposed scheme.
Quantitative Study of Lunisolar Precession Mechanism  [PDF]
Yueming Wu, Mingfu Cao
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.47021
According to Xiaodong Song et al.’s study about difference rotation in the Earth’s inner core, a physical model of lunar motion changing the angular momentum of the Earth’s circles is presented in this work. The Lunar motion makes there be a huge gap existing in the core angular momentum between far lunar hemisphere and near lunar hemisphere. The gap results in the difference rota-tion in the Earth’s inner core, meanwhile, it increases the angular velocity of far lunar hemisphere and decreases the angular velocity of near lunar hemisphere. The Earth’s liquid outer core gene-rates an astro-geodynamical effect including the difference rotation among the Earth’s circles. It is found that when the moon moves into the apogee or the perigee of the lunar orbit, and the moon phase is the upper and lower chords (i.e. semi-diameter place), the true anomaly of the moon will change from 270-degree back (or forward) to 90-degree; this results in the mantle shell of the Earth westward, and forms lunisolar precession, the vernal equinox westward and Chandler polar motion.
Skull base metastases from a malignant solitary fibrous tumor of the liver. A case report and literature review
Lu Peng, Yang Liu, Yongbiao Ai, Zhisu Liu, Yueming He, Quanyan Liu
Diagnostic Pathology , 2011, DOI: 10.1186/1746-1596-6-127
Abstract: Solitary fibrous tumors (SFTs) are a rare soft-tissue neoplasm that was initially described most commonly in the pleural cavity[1]. In the past decade, SFTs have been discovered at many body sites, including the liver (mostly the right lobe), orbits, superior respiratory tract, abdomen, breast and soft tissue [2-4]. SFTs are spindle cell neoplasms. The histogenesis of SFT has been a matter of contention and still has not been definitively discerned, but a mesenchymal origin is favored over a mesothelial origin[5].More than 80% of SFTs are benign, asymptomatic and slow-growing tumors, but malignant and symptomatic forms, most often in the pleura, have been described [6,7]. Clinical and radiological findings are not specific and cannot exclude malignancy. Preoperative cytology may be inconclusive or misleading. Notably, all SFTs that recurred or metastasized after resection in some larger series were ≥ 10 cm [8,9]. In addition, several authors describe a histologically malignant component with increased cellularity and mitoses in otherwise benign-appearing SFTs, as a frequent occurrence in tumors that recurred or metastasized [8-10]. The recommended treatment of SFT is surgical resection. Despite this treatment, SFTs can recur and metastasize and have reported 10-year overall survival rates of 54-89% after a complete surgical resection [11].However, surgical experience with SFTs of the liver is notably limited. In one series, 13.5% of 37 pleural SFTs metastasized [12] . SFT is rarely located in the liver parenchyma and usually follows a benign course. Few case reports in the literature describe a local recurrence of liver SFT and even fewer describe metastases [12-16]. In this study, we report a case of malignant liver SFT with skeletal metastasis and discuss the clinical presentation, previous diagnoses, radiological characteristics, histopathological and immunohistiochemical features, surgical treatment, adjunctive therapy and prognosis of SFTs with a review of the
Revisiting the tunnelling site of electrons in strong field enhanced ionization of molecules
Cheng Huang,Pengfei Lan,Yueming Zhou,Qingbin Zhang,Kunlong Liu,Peixiang Lu
Physics , 2014, DOI: 10.1103/PhysRevA.90.043420
Abstract: We investigated electron emissions in strong field enhanced ionization of asymmetric diatomic molecules by quantum calculations. It is demonstrated that the widely-used intuitive physical pic- ture, i.e., electron wave packet direct ionization from the up-field site (DIU), is incomplete. Besides DIU, we find another two new ionization channels, the field-induced excitation with subsequent ionization from the down-field site (ESID), and the up-field site (ESIU). The contributions from these channels depend on the molecular asymmetry and internuclear distance. Our work provides a more comprehensive physical picture for the long-standing issue about enhanced ionization of diatomic molecules.
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