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Search Results: 1 - 10 of 26742 matches for " HaiFei Jin "
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Improved eavesdropping detection strategy based on four-particle cluster state in quantum direct communication protocol
Jian Li,HaiFei Jin,Bo Jing
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5516-1
Abstract: In order to improve the eavesdropping detection efficiency in a two-step quantum direct communication protocol, an improved eavesdropping detection strategy using the four-particle cluster state is proposed, in which the four-particle cluster state is used to detect eavesdroppers. During the security analysis, the method of the entropy theory is introduced, and two detection strategies are compared quantitatively using the constraint between the information that the eavesdropper can obtain and the interference that has been introduced. If the eavesdroppers intend to obtain all information, the eavesdropping detection rate of the original two-step quantum direct communication protocol using EPR pair block as detection particles will be 50%; while the proposed strategy’s detection rate will be 75%. In the end, the security of the proposed protocol is discussed. The analysis results show that the eavesdropping detection strategy presented is more secure.
A Review on Social Responsibilities of Media from the Report of “Sanlu Problematic Milk Powder Incident”
Haifei Yu,Chengliang Zhang
Asian Social Science , 2009, DOI: 10.5539/ass.v5n4p81
Abstract: In an open and developed society, functions of media continue to spread, and their social responsibilities are also on the increase. As the social watcher and environmental monitor, how they should accomplish the historical mission endowed by the society in the presence of significant public and social issues? In this paper, taking the incident of “Sanlu problematic milk powder” as an example, the authors will discuss the social responsibilities of media in this incident.
A Remarkable New Species of Liparis (Orchidaceae) from China and Its Phylogenetic Implications
Lin Li, Haifei Yan
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0078112
Abstract: In the present study, we formally describe Liparis pingxiangensis as a new species from Guangxi, China on the basis of morphological and molecular phylogenetic analyses. It is easily distinguished from closely related species by strongly curved column without column wings, and broadly rhombic-elliptic lip with 2 uncinate calli at the base. In particular, it differs most markedly from its congeners in possessing two pollinia attached by long and prominent caudicles (not stipes), to a distinct sticky disc. This type of pollinarium, as far as we know, is not found in any other species of Liparis, and is also unique among the orchids with waxy pollinia. We then proceeded to a phylogenetic analysis to ascertain the systematic position of this enigmatic species. Molecular study based on nuclear ribosomal ITS and plastid matK DNA sequence data supports L. pingxiangensis as a distinct species, which forms an independent lineage sister to L. nervosa and its allies (93% BS, 1.00 BPP). In the light of previous work, the findings have important implications for a better understanding of the well-supported pattern mainly based on vegetative features in Malaxideae.
A fundamental numerical and theoretical study for the vibrational properties of nanowires
Haifei Zhan,Yuantong Gu
Physics , 2012, DOI: 10.1063/1.4729485
Abstract: Based on the molecular dynamics (MD) simulation and the classical Euler-Bernoulli beam theory, a fundamental study of the vibrational performance of the Ag nanowire (NW) is carried out. A comprehensive analysis of the quality (Q)-factor, natural frequency, beat vibration, as well as high vibration mode is presented. Two excitation approaches, i.e., velocity excitation and displacement excitation, have been successfully implemented to achieve the vibration of NWs. Upon these two kinds of excitations, consistent results are obtained, i.e., the increase of the initial excitation amplitude will lead to a decrease to the Q-factor, and moderate plastic deformation could increase the first natural frequency. Meanwhile, the beat vibration driven by a single relative large excitation or two uniform excitations in both two lateral directions is observed. It is concluded that the nonlinear changing trend of external energy magnitude does not necessary mean a non-constant Q-factor. In particular, the first order natural frequency of the Ag NW is observed to decrease with the increase of temperature. Furthermore, comparing with the predictions by Euler-Bernoulli beam theory, the MD simulation provides a larger and smaller first vibration frequency for the clamped-clamped and clamped-free thin Ag NWs, respectively. Additionally, for thin NWs, the first order natural frequency exhibits a parabolic relationship with the excitation magnitudes. The frequencies of the higher vibration modes tend to be low in comparison to Euler-Bernoulli beam theory predictions. A combined initial excitation is proposed which is capable to drive the NW under a multi-modes vibration and arrows the coexistence of all the following low vibration modes. This work sheds lights on the better understanding of the mechanical properties of NWs, and benefits the increasing utilities of NWs in diverse nano-electronic devices.
Design of a Turbulence Generator of Medium Consistency Pulp Pumps
Hong Li,Haifei Zhuang,Weihao Geng
International Journal of Rotating Machinery , 2012, DOI: 10.1155/2012/413674
Abstract: The turbulence generator is a key component of medium consistency centrifugal pulp pumps, with functions to fluidize the medium consistency pulp and to separate gas from the liquid. Structure sizes of the generator affect the hydraulic performance. The radius and the blade laying angle are two important structural sizes of a turbulence generator. Starting with the research on the flow inside and shearing characteristics of the MC pulp, a simple mathematical model at the flow section of the shearing chamber is built, and the formula and procedure to calculate the radius of the turbulence generator are established. The blade laying angle is referenced from the turbine agitator which has the similar shape with the turbulence generator, and the CFD simulation is applied to study the different flow fields with different blade laying angles. Then the recommended blade laying angle of the turbulence generator is formed to be between 60° and 75°. 1. Introduction MC (Medium Consistency) pulp pumps are key equipment to transport pulp in modern paper mills. Paper pulp suspension contains three kinds of media, namely, fibers, water, and air, which results in a high flow complexity and particularity in the pump itself. The pulp cannot move when the pulp mass consistency is more than 6%. In order to transport the medium with the consistency over 6%, the MC pulp pumps must have the ability to fluidize the pulp. The turbulence generator is the key component of the MC centrifugal pulp pump, which fluidizes the MC pulp and separates the gas from the pulp suspension. The structure of MC pulp pumps is shown in Figure 1. Figure 1: MC pulp pump. (1) Turbulence generator. (2) Casing. (3) Impeller. (4) Gas outlet. (5) Mechanical seal. Some research had been done in China [1–4], including the simulation of fluidization of paper pulp suspension and the optimized designs of the turbulence generator. But the systemic design theories and methods are still not built. Starting with the research on the flow and shearing characteristics of the MC pulp, a simple mathematic model is built, and the formula for calculating the radius of the turbulence generator is established. The range of the blade laying angle is obtained by the recommended blade laying angle from the turbine agitator which has the same shape as the turbulence generator, and the CFD simulation is applied to study the different flow fields with different blade laying angles. 2. Deducing the Critical Shear Velocity Gradient The flow of MC pulp suspension is neither similar to usual water flow, nor to two-phase flow or
Beat Phenomena in Metal Nanowires, and their Implications for Resonance-Based Elastic Property Measurements
Haifei Zhan,Yuantong Gu,Harold S. Park
Physics , 2012, DOI: 10.1039/C2NR31545A
Abstract: The elastic properties of 1D nanostructures such as nanowires are often measured experimentally through actuation of the nanowire at its resonance frequency, and then relating the resonance frequency to the elastic stiffness using elementary beam theory. In the present work, we utilize large scale molecular dynamics simulations to report a novel beat phenomenon in [110] oriented Ag nanowires. The beat phenomenon is found to arise from the asymmetry of the lattice spacing in the orthogonal elementary directions of the [110] nanowire,i.e., [-110] and [001] directions, which results in two different principal moments of inertia. Because of this, actuations imposed along any other direction are found to decompose into two orthogonal vibrational components based on the actuation angle relative to these two elementary directions, with this phenomenon being generalizable to <110> FCC nanowires of different materials (Cu, Au, Ni, Pd and Pt).The beat phenomenon is explained using a discrete moment of inertia model based on the hard sphere assumption, the model is utilized to show that surface effects enhance the beat phenomenon, while the effect is reduced with increasing nanowires cross-sectional size or aspect ratio.Most importantly, due to the existence of the beat phenomena, we demonstrate that in resonance experiments only a single frequency component is expected to be observed, particularly when the damping ratio is relatively large or very small.Furthermore, for a large range of actuation angles, the lower frequency is more likely to be detected than the higher one,which implies the experimental predictions of Young's modulus obtained from resonance may in fact be under predictions. The present study therefore has significant implications for experimental interpretations of Young's modulus as obtained via resonance testing.
Carbon Nanotube-based Super Nanotube: Tailorable Thermal Conductivity at Three-dimensional
Haifei Zhan,John M. Bell,Yuantong Gu
Physics , 2015, DOI: 10.1039/C5RA05584A
Abstract: The advancements of nanomaterials or nanostructures have enabled the possibility of fabricating multifunctional materials that hold great promises in engineering applications. The carbon nanotube (CNT)-based nanostructure is one representative building block for such multifunctional materials. Based on a series of in silico studies, we report the tailorability of the thermal conductivity of a three-dimensional CNT-based nanostructure, i.e., the single wall CNT (SWNT)-based super nanotube (ST). It is shown that the thermal conductivity of STs varies with different connecting carbon rings, and the ST with longer constituent SWNTs and larger diameter yield to a smaller thermal conductivity. Further results reveal that the inverse of the ST thermal conductivity exhibits a good linear relationship with the inverse of its length. Particularly, it is found that the thermal conductivity exhibits an approximately proportional relationship with the inverse of the temperature, but appears insensitive to the axial strain due to its Poisson ratio. These results, in the one hand, provide a fundamental understanding of the thermal transport properties of the super carbon nanotubes conductivities of ST, and in the other hand shed lights on their future design or fabrication and engineering applications.
Two-dimensional Graphene Heterojunctions: the Tunable Mechanical Properties
Kang Xia,Haifei Zhan,Yuantong Gu
Physics , 2015, DOI: 10.1016/j.carbon.2015.09.022
Abstract: We report the mechanical properties of different two-dimensional carbon heterojunctions (HJs) made from graphene and various stable graphene allotropes, including {\alpha}-, {\beta}-, {\gamma}- and 6612-graphyne (GY), and graphdiyne (GDY). It is found that all HJs exhibit a brittle behaviour except the one with {\alpha}-GY, which however shows a hardening process due to the formation of triple carbon rings. Such hardening process has greatly deferred the failure of the structure. The yielding of the HJs is usually initiated at the interface between graphene and graphene allotropes, and monoatomic carbon rings are normally formed after yielding. By varying the locations of graphene (either in the middle or at the two ends of the HJs), similar mechanical properties have been obtained, suggesting insignificant impacts from location of graphene allotropes. Whereas, changing the types and percentages of the graphene allotropes, the HJs exhibit vastly different mechanical properties. In general, with the increasing graphene percentage, the yield strain decreases and the effective Young's modulus increases. Meanwhile, the yield stress appears irrelevant with the graphene percentage. This study provides a fundamental understanding of the tensile properties of the heterojunctions that are crucial for the design and engineering of their mechanical properties, in order to facilitate their emerging future applications in nanoscale devices, such as flexible/stretchable electronics.
The Phenotypic Conversion of Macrophage Detected by FACS in EAE Mice Treated with or without Fasudil  [PDF]
Chunyun Liu, Yong Xie, Yanhua Li, Jiezhong Yu, Ling Feng, Shaowei Hou, Haifei Zhang, Cungen Ma, Baoguo Xiao
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B101
Abstract:

We studied the changes of macrophage populations in splenic mononuclear cells of experimental autoimmune ence-phalomyelitis (EAE) mice treated with or without Fasudil. Phenotypic analysis using flow cytometry showed that the levels of TLR4, CD11c and CD40 which represent the type 1 macrophage, were depressed in Fasudil-treated mice. Incontrast, it was observed the expressions of CD200 and CD14 which typify the type 2 macrophage were elevated in Fasudil-treated mice as compared to EAE mice. And we also found that Fasudil at dose of 40 mg/kg alleviated the se-verity of symptom in EAE mice. Based on the evidence that M1 macrophages are neurotoxic and M2 macrophages promote a regenerative growth, indicating that polarization and shifting of macrophages into M2 cells may also play key roles in treatment of EAE.

An Sm-Nd isotopic dating study of the Archean Kongling Complex in the Huangling area of the Yangtze Craton
Ling Wenli,Shan Gao,Haifei Zheng,Lian Zhou,Zhubin Zhao
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883222
Abstract: Sm-Nd isotopic compositions of associated amphibolites, TTG gneisses and granitic gneisses from the Archean Kongling Complex of the Yangtze Craton, South China are systematically analyzed. The results show that the amphibolites and TTG gneisses have a similar age of ca. 2 700 Ma, which well agrees with zircon U-Pb dating of previous studies. However, their εND(t) are different, suggestive of possible dissimilarity in source composition.
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