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Search Results: 1 - 10 of 13729 matches for " Jiamin Xue "
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Berry phase and the unconventional quantum Hall effect in graphene
Jiamin Xue
Physics , 2013,
Abstract: The Berry phase of \pi\ in graphene is derived in a pedagogical way. The ambiguity of how to calculate this value properly is clarified. Its connection with the unconventional quantum Hall effect in graphene is discussed.
Graphene on Hexagonal Boron Nitride
Matthew Yankowitz,Jiamin Xue,Brian J. LeRoy
Physics , 2014, DOI: 10.1088/0953-8984/26/30/303201
Abstract: The field of graphene research has developed rapidly since its first isolation by mechanical exfoliation in 2004. Due to the relativistic Dirac nature of its charge carriers, graphene is both a promising material for next-generation electronic devices and a convenient low-energy testbed for intrinsically high-energy physical phenomena. Both of these research branches require the facile fabrication of clean graphene devices so as not to obscure its intrinsic physical properties. Hexagonal boron nitride has emerged as a promising substrate for graphene devices, as it is insulating, atomically flat and provides a clean charge environment for the graphene. Additionally, the interaction between graphene and boron nitride provides a path for the study of new physical phenomena not present in bare graphene devices. This review focuses on recent advancements in the study of graphene on hexagonal boron nitride devices from the perspective of scanning tunneling microscopy with highlights of some important results from electrical transport measurements.
Scanning gate microscopy of ultra clean carbon nanotube quantum dots
Jiamin Xue,Rohan Dhall,Stephen B. Cronin,Brian J. LeRoy
Physics , 2015,
Abstract: We perform scanning gate microscopy on individual suspended carbon nanotube quantum dots. The size and position of the quantum dots can be visually identified from the concentric high conductance rings. For the ultra clean devices used in this study, two new effects are clearly identified. Electrostatic screening creates non-overlapping multiple sets of Coulomb rings from a single quantum dot. In double quantum dots, by changing the tip voltage, the interactions between the quantum dots can be tuned from the weak to strong coupling regime.
An Improved Moving Object Detection Algorithm Based on Gaussian Mixture Models  [PDF]
Xuegang Hu, Jiamin Zheng
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.67045
Abstract: Aiming at the problems that the classical Gaussian mixture model is unable to detect the complete moving object, and is sensitive to the light mutation scenes and so on, an improved algorithm is proposed for moving object detection based on Gaussian mixture model and three-frame difference method. In the process of extracting the moving region, the improved three-frame difference method uses the dynamic segmentation threshold and edge detection technology, and it is first used to solve the problems such as the illumination mutation and the discontinuity of the target edge. Then, a new adaptive selection strategy of the number of Gaussian distributions is introduced to reduce the processing time and improve accuracy of detection. Finally, HSV color space is used to remove shadow regions, and the whole moving object is detected. Experimental results show that the proposed algorithm can detect moving objects in various situations effectively.
Study on the Mechanism of Heterogeneous Catalysis (1) —The Measurement of Equilibrium Pressure of Reaction BaCO3 + C = BaO + 2CO, the Chemical States of Fe in Reaction Tank, and Chemical Reaction Model Catalytic Cycle Mechanism (CRMM)  [PDF]
Jiamin Jin, Weifan Bao
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.57010
Abstract: The results on the equilibrium pressure measurement of BaCO3 + C = BaO + 2CO reaction and the demonstration of chemical state of iron proved that decomposition-generation cycle of BaCO3 and oxidation-reduction cycle of Fe in that reaction condition case were impossible to occur. The Chemical Reaction Model Catalytic Cycle Mechanism-CRMM does not exist at all for BaCO3, Fe, Noble metal catalysts. To call CRMM as a “principle” was obviously inappropriate. The TOF (Turnover Frequency—TOF: unit: s-1) was used to measure the activity size and life of catalyst, and it is clearly out of nothing.
Study on the Mechanism of Heterogeneous Catalysis (2)
—The Relative Catalytic Activities of Fe, Co, Ni, Cu, Ag and SiO2 in the Carbon Catalyzed Gasification Reaction

Jiamin Jin, Weifang Bao
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.64018
Abstract: This is a validation article. The experimental results such as the relative catalytic activities of Fe, Co, Ni, Cu, Ag and SiO2 poisoning in the carbothermic reduction iron oxide show that the Electron Cyclic Donate-Accept Catalytic Mechanism-ECDAM or Electron Obital Deformation-Recovery cycle Catalysis Mechanism-EODRM are credible, and the Chemical Reaction Model Catalytic Cyclic Mechanism-CRMM such as the Oxygen Transfer Mechanism-OTT that is long and wide spread in the literature is completely unreliable. Because the Fe, Co, Ni, Cu, Ag were unlikely to react cyclic oxidation—reduction reaction with the carbon in the carbon reduction reaction tank.
Study on the Mechanism of Heterogeneous Catalysis (4)—Electron Cyclic Donate-Accept Catalysis Mechanism-ECDAM or Electron Orbital Deformation-Reversion Cyclic Catalysis Mechanism-EODRM  [PDF]
Jiamin Jin, Weifang Bao
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.68003
Abstract: This paper has expounded the derivation of the Electron Cyclic Donate-Accept Catalysis Mechanism-ECDAM or Electron Orbital Deformation-Reversion Cyclic Catalysis Mechanism-EODRM and its three main arguments as well as three argument verifications. These three main arguments are: 1) There is a demarcation between catalysts and poisons, or promoters and poisons. 2) The relative activities of catalysts or poisons of poisons are closely related to the Electrical Negativity Values-ENV of catalysts or poison. 3) The activities or ENVs of catalysts are closely related to the chemical states of substance being added. The ECDAM or EODRM can also be extended to iron or metal base catalyst for selecting promoter, support and judging poison. It can also be extended to the study of the fire retardant of carbon materials. The author holds that the catalytic phenomenon should be physical phenomenon rather than chemical phenomenon or not completely chemical phenomenon at least.
Spatiotemporal Distribution of Precipitation Recycling across the Arid Regions of Asia and Africa  [PDF]
Jiamin Li, Ruirui Si
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.69015
Abstract: The degree of water vapour recycling in terrestrial precipitation is still a debatable topic, particularly in arid regions. Here, the spatiotemporal evolution of evaporation, calculated via the water balance method [1], and the precipitation recycling ratio, calculated using a water recycling model [2], are investigated across Asia and Africa for the 1984-2013 time period. The results show that the precipitation recycling ratio in North Africa and China-Mongolia is stronger in summer but weaker in winter. However, it is stronger in winter and spring in West Asia but weaker in summer. Evaporation accounts for a small proportion of the precipitation uptake in arid regions, with external water vapour transportation exerting the primary influence on precipitation recycling. Increasing global temperatures and evaporation potentials over the past 30 years have driven the actual evaporation and precipitation recycling ratio increases in North Africa and West Asia and corresponding decreases in China-Mongolia.
High pT gamma-hadron and pi0-hadron correlations in sqrt(sNN)=200GeV Au+Au collisions in PHENIX
Jiamin Jin
Physics , 2005, DOI: 10.1556/APH.27.2006.2-3.13
Abstract: This poster presents the PHENIX results on high-p_T gamma-hadron and pi0-hadron correlations and shows the modification of away side jet shape by the medium. By comparing their jet shapes and yields, we see some evidence of the direct gamma contribution to correlation functions.
Long wavelength local density of states oscillations near graphene step edges
Jiamin Xue,Javier Sanchez-Yamagishi,K. Watanabe,T. Taniguchi,Pablo Jarillo-Herrero,Brian J. LeRoy
Physics , 2011, DOI: 10.1103/PhysRevLett.108.016801
Abstract: Using scanning tunneling microscopy and spectroscopy, we have studied the local density of states (LDOS) of graphene over step edges in boron nitride. Long wavelength oscillations in the LDOS are observed with maxima parallel to the step edge. Their wavelength and amplitude are controlled by the energy of the quasiparticles allowing a direct probe of the graphene dispersion relation. We also observe a faster decay of the LDOS oscillations away from the step edge than in conventional metals. This is due to the chiral nature of the Dirac fermions in graphene.
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