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Search Results: 1 - 10 of 5830 matches for " Hongjun Chu "
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Prospect of Natural Gas Utilization in China  [PDF]
Wei Huang, Hongjun You
Advances in Chemical Engineering and Science (ACES) , 2011, DOI: 10.4236/aces.2011.12010
Abstract: This paper introduces the source and utility circumstance of natural gas in China. The utility cir-cumstance of natural gas is discussed in detail, such as, natural gas as feedstock is produced to acetylene; natural gas is used to cut metal; natural gas is applied to generate ethylene; natural gas instead of heavy oil is fired to produce chromium trioxide. In so doing, the energy demand of China will be better met with least damage to the environment. According to the full utility of natural gas sources, their good economic and social benefits are obtained.
Exhaust emission characteristics of diesel and biodiesel  [PDF]
Yongmei Zhang, Hongjun You
Advances in Biological Chemistry (ABC) , 2011, DOI: 10.4236/abc.2011.13014
Abstract: The performances of diesel contrasted with that of biodiesel, such as HC and CO and NOx and fume and particles discharge, are studied on. The contents of HC, CO, NOx and flue gas are measured by Japan 163 Gas Chromatograph, USA 48 CO Analyser, Japan MEXA-7200H and FBY-201 flue gas analyzer, respectively. The experimental results shows HC dis-charge of biodiesel B20 decreases with the increase of rate of revolution; NOx discharge of biodiesel B5 and biodiesel B20 increase with the increase of torque; NOx discharge increases with the increase of adding biodiesel at the same torque; Flue gas discharge of biodiesel B5 and biodiesel B20 firstly increase and then decrease with the increase of torque; Particle discharge decreases with the increase of the amount of biodiesel.
Genome-Wide Screen of DNA Methylation Changes Induced by Low Dose X-Ray Radiation in Mice
Jingzi Wang, Youwei Zhang, Kai Xu, Xiaobei Mao, Lijun Xue, Xiaobei Liu, Hongjun Yu, Longbang Chen, Xiaoyuan Chu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090804
Abstract: Epigenetic mechanisms play a key role in non-targeted effects of radiation. The purpose of this study was to investigate global hypomethylation and promoter hypermethylation of particular genes induced by low dose radiation (LDR). Thirty male BALB/c mice were divided into 3 groups: control, acutely exposed (0.5Gy X-rays), and chronic exposure for 10 days (0.05Gy/d×10d). High-performance liquid chromatography (HPLC) and MeDIP-quantitative polymerase chain reaction (qPCR) were used to study methylation profiles. DNMT1 and MBD2 expression was determined by qPCR and western blot assays. Methylation and expression of Rad23b and Ddit3 were determined by bisulfate sequencing primers (BSP) and qPCR, respectively. The results show that LDR induced genomic hypomethylation in blood 2 h postirraditaion, but was not retained at 1-month. DNMT1 and MBD2 were downregulated in a tissue-specific manner but did not persist. Specific hypermethylation was observed for 811 regions in the group receiving chronic exposure, which covered almost all key biological processes as indicated by GO and KEGG pathway analysis. Eight hypermethylated genes (Rad23b, Tdg, Ccnd1, Ddit3, Llgl1, Rasl11a, Tbx2, Scl6a15) were verified by MeDIP-qPCR. Among them, Rad23b and Ddit3 gene displayed tissue-specific methylation and downregulation, which persisted for 1-month postirradiation. Thus, LDR induced global hypomethylation and tissue-specific promoter hypermethylation of particular genes. Promoter hypermethylation, rather than global hypomethylation, was relatively stable. Dysregulation of methylation might be correlated with down-regulation of DNMT1 and MBD2, but much better understanding the molecular mechanisms involved in this process will require further study.
Four Lump Kinetics Models to Describe the Aromatization Reactions of Liquefied Petroleum Gas
Hongjun YouC
The Open Fuels & Energy Science Journal , 2008, DOI: 10.2174/1876973X00801010067]
Abstract: The aromatization reaction of liquefied petroleum gas has been studied by using three liquefied petroleum gases as raw material and LBO-A as catalyst, and four lump kinetics models networks have been put up on the basis of lump theory and the aromatization reaction mechanism. In the network the aromatization reaction species was firstly lumped into C4 , propylene, low molecule hydrocarbon, liquid and coke. A mathematical method was first introduced to study on the product distribution of liquefied petroleum gas aromatization reaction. The results from experimental data are in accordance with the quantitatively analytical conclusions drawn from the calculated data.
Japan and Zhongdong Railway Incident
Hongjun Zhang
Asian Culture and History , 2009, DOI: 10.5539/ach.v1n2p57
Abstract: It has been for quite some time the conspiracy that Japan invaded China and seized the Northeast. In the process of its implementation of the conspiracy, there had a vehement interest conflict between Japan and Soviet Russia. After the Japan-Russia War, Northeast China became a sphere of influence between Russia and Japan, but they fought against each other continually for Zhongdong Railway issue. After the September 18 Incident, situation of Zhongdong Railway was in depression, together with threat of Puppet Manchu, so in 1933, Soviet Union government transferred all its authority in Zhongdong Railway to “Manchuria Government” in a paid form. Japan eventually achieved its purpose.
Peasants Should Enjoy Equal Social Security Right with Urban Dwellers
Hongjun Yao
Asian Social Science , 2009, DOI: 10.5539/ass.v4n8p21
Abstract: According to the Constitution of the People’s Republic of China and the effective conventions therein, every citizen should enjoy equal right of social security. But in reality, a peasant has much less such right than an urban dweller, only because of their different hukou. Peasants, as part of the investors of state-owned property, should have the rights of owners and enjoy the benefits from their assets; the existing binary social frame which limits the rights of peasants baffles China’s progress into a market economy and founding of a harmonious social society. Therefore, establishing a uniform system of security right that authorizes all citizens to enjoy it equally is one of China’s urgent tasks.
Delta Shock Waves for a Linearly Degenerate Hyperbolic System of Conservation Laws of Keyfitz-Kranzer Type
Hongjun Cheng
Advances in Mathematical Physics , 2013, DOI: 10.1155/2013/958120
Abstract: This paper is devoted to the study of delta shock waves for a hyperbolic system of conservation laws of Keyfitz-Kranzer type with two linearly degenerate characteristics. The Riemann problem is solved constructively. The Riemann solutions include exactly two kinds. One consists of two (or just one) contact discontinuities, while the other contains a delta shock wave. Under suitable generalized Rankine-Hugoniot relation and entropy condition, the existence and uniqueness of delta shock solution are established. These analytical results match well the numerical ones. Finally, two kinds of interactions of elementary waves are discussed. 1. Introduction Consider the following hyperbolic system of conservation laws: where with . Model (1) belongs to the nonsymmetric system of Keyfitz-Kranzer type [1, 2] as System (1) was also introduced as a macroscopic model for traffic flow by Aw and Rascle [3], where and are the density and the velocity of cars on the roadway, and the function is smooth and strictly increasing and it satisfies Model (1) was also studied by Lu [2]. By using the compensated compactness method, he established the existence of global bounded weak solutions of the Cauchy problem under the following two assumptions on , respectively: One can find that system (1) has two characteristics; one is always linearly degenerate while the other is linearly degenerate or genuinely nonlinear depending on the behaviors of . In [2, 3], the condition (3) is required, which implies that the second characteristic is genuinely nonlinear. Thus, one interesting topic is the case when both characteristics are linearly degenerate. These motivate us to consider (1) with which is the prototype function satisfying For system (1) with (5) or (6), a distinctive feature is that both eigenvalues are linearly degenerate; that is, this is a fully linearly degenerate system. Thus, all the classical elementary waves only consist of contact discontinuities. Moreover, the overlapping of linearly degenerate characteristics may result in the formation of delta shock wave. A delta shock wave is a generalization of an ordinary shock wave. Speaking informally, it is a kind of discontinuity, on which at least one of the state variables may develop an extreme concentration in the form of a Dirac delta function with the discontinuity as its support. It is more compressive than an ordinary shock wave in the sense that more characteristics enter the discontinuity line. From the physical point of view, a delta shock wave represents the process of concentration of the mass and formation of
The redshift and geometrical aspect of photons
Hongjun Pan
Physics , 2007,
Abstract: The cosmological redshift phenomenon can be described by the dark matter field fluid model, the results deduced from this model agree very well with the observations. The observed cosmological redshift of light depends on both the speed of the emitter and the distance between the emitter and the observer. If the emitter moves away from us, a redshift is observed. If the emitter moves towards us, whether a redshift, a blueshift or no shift is observed will depend on the speed vs. the distance. If the speed is in the range of c(exp[-beta*D]-1) < v < 0, a redshift is observed; if the speed equals c(exp[-beta*D]-1), no shift is observed; if the speed v less than c(exp[-beta*D]-1), a blueshift is observed. A redshift will be always observed in all directions for any celestial objects as long as their distance from us is large enough. Therefore, many more redshifts than blueshifts should be observed for galaxies and supernovae, etc in the sky. This conclusion agrees with current observations. The estimated value of the redshift constant beta of the dark matter field fluid is in the range of 10^(-3) ~ 10^(-5)/Mpc. A large redshift value from a distant celestial object may not necessarily indicate that it has a large receding speed. Based on the redshift effect of dark matter field fluid, it is concluded that at least in time average all photons have the same geometry (size and shape) in all inertial reference frames and do not have length contraction effect.
The evolution of the Earth-Moon system based on the dark matter field fluid model
Hongjun Pan
Physics , 2007,
Abstract: The evolution of Earth-Moon system is described by the dark matter field fluid model proposed in the Meeting of Division of Particle and Field 2004, American Physical Society. The current behavior of the Earth-Moon system agrees with this model very well and the general pattern of the evolution of the Moon-Earth system described by this model agrees with geological and fossil evidence. The closest distance of the Moon to Earth was about 259000 km at 4.5 billion years ago, which is far beyond the Roche's limit. The result suggests that the tidal friction may not be the primary cause for the evolution of the Earth-Moon system. The average dark matter field fluid constant derived from Earth-Moon system data is 4.39 x 10^(-22) s^(-1)m^(-1). This model predicts that the Mars's rotation is also slowing with the angular acceleration rate about -4.38 x 10^(-22) rad s^(-2).
Origin of Polar Distortion in LiNbO3-type "Ferroelectric" Metals: Role of A-site Instability and Short-Range Interactions
Hongjun Xiang
Physics , 2013, DOI: 10.1103/PhysRevB.90.094108
Abstract: Since conduction electrons of a metal screen effectively the local electric dipole moments, it was widely believed that the ferroelectric-like distortion cannot occur in metals. Recently, metallic LiOsO3, was discovered to be the first clear-cut example of an Anderson-Blount "ferroelectric" metal, which at 140 K undergoes a ferroelectric-like structural transition similar to insulating LiNbO3. This is very surprising because the mechanisms for structural phase transitions are usually quite distinct in metals and insulators. Through performing first principles calculations, here we reveal that the local polar distortion in LiOsO3 is solely due to the instability of the A-site Li atom, in contrast to the LiNbO3 case where the second order Jahn-Teller effect of the B-site Nb ion also plays an additional role. More importantly, the "ferroelectric"-like long range order of the local polar distortion is found to be due to the predominantly ferroelectric short-range pair interactions between the local polar modes which are not screened by conduction electrons. Furthermore, we predict that LiNbO3-type MgReO3 is also a "ferroelectric" metal, but with a much higher structural transition temperature by 391 K than LiOsO3. Our work not only unravels the origin of FE-like distortion in LiNbO3-type "ferroelectric" metals, but also provides clue for designing other multi-functional "ferroelectric" metals.
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