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Search Results: 1 - 10 of 127398 matches for " Xiaobo Li "
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Treating Heavy Oil Wastewater for Beneficial Use by Integrated Technology of Bio-Oxidation and RO
LI Jingting,LIU Xiaobo
Advances in Petroleum Exploration and Development , 2013, DOI: 10.3968/j.aped.1925543820130501.1156
Abstract: Heavy oil exploitation wastewater is characterized by its high concentration of emulsified oil, high salinity, high temperature and complex chemical components. This paper discuss a successful pilot-scale demonstration application of a unique technology integrating heat exchanger, gas floatation, biological contact oxygen, filtration, ultra-filtration, reverse osmosis at Chenzhuang oilfield. The scale of the process was about 360 m3/d, and the performance of the treatment process, the effectiveness of the technology for removal of oil and for controlling RO membranes fouling, and the economic effect are also discussed. Operation results show that the biological contact oxidation--ultra filtration process can reduce the oil contents to less than 0.5 mg/L and TDS to less than 3. The conductivity of RO effluent is below 456 μS·cm-1, the treated water can meet the required standard for steam-injected boiler, and it can also be used to prepare polymer solution for viscosity keeping. Key words: Heavy oil wastewater; Biological contact oxygen; RO; Steam boiler; Polymer solution
Land Suitability Assessment on a Watershed of Loess Plateau Using the Analytic Hierarchy Process
Xiaobo Yi, Li Wang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069498
Abstract: In order to reduce soil erosion and desertification, the Sloping Land Conversion Program has been conducted in China for more than 15 years, and large areas of farmland have been converted to forest and grassland. However, this large-scale vegetation-restoration project has faced some key problems (e.g. soil drying) that have limited the successful development of the current ecological-recovery policy. Therefore, it is necessary to know about the land use, vegetation, and soil, and their inter-relationships in order to identify the suitability of vegetation restoration. This study was conducted at the watershed level in the ecologically vulnerable region of the Loess Plateau, to evaluate the land suitability using the analytic hierarchy process (AHP). The results showed that (1) the area unsuitable for crops accounted for 73.3% of the watershed, and the main factors restricting cropland development were soil physical properties and soil nutrients; (2) the area suitable for grassland was about 86.7% of the watershed, with the remaining 13.3% being unsuitable; (3) an area of 3.95 km2, accounting for 66.7% of the watershed, was unsuitable for forest. Overall, the grassland was found to be the most suitable land-use to support the aims of the Sloping Land Conversion Program in the Liudaogou watershed. Under the constraints of soil water shortage and nutrient deficits, crops and forests were considered to be inappropriate land uses in the study area, especially on sloping land. When selecting species for re-vegetation, non-native grass species with high water requirements should be avoided so as to guarantee the sustainable development of grassland and effective ecological functioning. Our study provides local land managers and farmers with valuable information about the inappropriateness of growing trees in the study area along with some information on species selection for planting in the semi-arid area of the Loess Plateau.
A direct comparison of X-ray spectral models for tori in active galactic nuclei
Yuan Liu,Xiaobo Li
Physics , 2015, DOI: 10.1093/mnrasl/slu198
Abstract: Several X-ray spectral models for tori in active galactic nuclei (AGNs) are available to constrain the properties of tori; however, the accuracy of these models has not been verified. We recently construct a code for the torus using Geant4, which can easily handle different geometries (Liu & Li 2014). Thus, we adopt the same assumptions as Murphy & Yaqoob (2009, hereafter MY09) and Brightman & Nandra (2011, hereafter BN11) and try to reproduce their spectra. As a result, we can reproduce well the reflection spectra and the strength of the Fe K$\alpha$ line of MY09, for both $\NH=10^{24}$ and $10^{25}$ cm$^{-2}$. However, we cannot produce the strong reflection component of BN11 in the low-energy band. The origin of this component is the reflection from the visible inner wall of the torus, and it should be very weak in the edge-on directions under the geometry of BN11. Therefore, the behaviour of the reflection spectra in BN11 is not consistent with their geometry. The strength of the Fe K$\alpha$ line of BN11 is also different from our results and the analytical result in the optically thin case. The limitation of the spectral model will bias the parameters from X-ray spectral fitting.
An X-ray spectral model for clumpy tori in active galactic nuclei
Yuan Liu,Xiaobo Li
Physics , 2014, DOI: 10.1088/0004-637X/787/1/52
Abstract: We construct an X-ray spectral model for the clumpy torus in an active galactic nucleus (AGN) using Geant4, which includes the physical processes of the photoelectric effect, Compton scattering, Rayleigh scattering, $\gamma$ conversion, fluorescence line, and Auger process. Since the electrons in the torus are expected to be bounded instead of free, the deviation of the scattering cross section from the Klein-Nishina cross section has also been included, which changes the X-ray spectra by up to 25% below $10$ keV. We have investigated the effect of the clumpiness parameters on the reflection spectra and the strength of the fluorescent line Fe K$\alpha$. The volume filling factor of the clouds in the clumpy torus only slightly influences the reflection spectra, however, the total column density and the number of clouds along the line of sight significantly change the shapes and amplitudes of the reflection spectra. The effect of column density is similar to the case of a smooth torus, while a small number of clouds along the line of sight will smooth out the anisotropy of the reflection spectra and the fluorescent line Fe K$\alpha$. The smoothing effect is mild in the low column density case ($\NH=10^{23}$ cm$^{-2}$), whereas it is much more evident in the high column density case ($\NH=10^{25}$ cm$^{-2}$). Our model provides a quantitative tool for the spectral analysis of the clumpy torus. We suggest that the joint fits of the broad band spectral energy distributions of AGNs (from X-ray to infrared) should better constrain the structure of the torus.
Alloy Gene Gibbs Energy Partition Function and Equilibrium Holographic Network Phase Diagrams of AuCu-Type Sublattice System  [PDF]
Youqing Xie, Xiaobo Li, Xinbi Liu, Yaozhuang Nie, Hongjian Peng
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.610045
Abstract: Taking AuCu-sublattice system as an example, we present two discoveries and a method. First, the alloy gene sequences are the central characteristic atom sequences in the basic coordination cluster sequences. Second, the transmission mode of the information about structures and properties of the alloy genes is described by the alloy gene Gibbs energy partition function. The most valuable method in the system sciences is “the whole obtained from a few parts”. We have established the alloy gene database and holographic alloy positioning system of the Au-Cu system, as well as alloy gene Gibbs energy partition function and equilibrium holographic network phase diagrams of the AuCu-type sublattice system. It means that a standard way for researchers to share predictive algorithms and computational methods may be produced during designing advanced alloys.
Research on V2G Control Strategy for EV Charge and Discharge Equipmen  [PDF]
Mai Zhang, Caihong Zhao, Xiaobo Tang, Li Liu, Lijuan Tan
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B256
Abstract:

In this paper, the fundamental structure of charge and discharge device of V2G is analyzed. As for three phase voltage source PWM converter’s control, this paper presents that the control strategy of direct power control PWM rectifier is adopted under charging operation and constant power control strategy is used under discharging operation. For bidirectional DC/DC converter control strategy, dual closed-loop control of external voltage loop and internal current loop is put into use. The whole system of charge and discharge device of V2G is modeled and simulated by using the toolbox of PSCAD/EMTDC. Two-way power energy and information interaction of electric vehicle and power grid has been realized, current harmonic on grid side is decreased, power factor and power quality are improved.

Expansion by Laguerre Function for Wave Diffraction around an Infinite Cylinder  [PDF]
Mingdong Lv, Hui Li, Huilong Ren, Xiaobo Chen
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.31010
Abstract:

We consider a vertical circular cylinder on which the vertical variation of water diffraction waves is to be represented by a series of Laguerre functions \"\" ?using Laguerre Polynomials \"\" . The variation is assumed to be of the form \"\"

Alloy Gene Sequence Project and System Science Philosophy  [PDF]
Youqing Xie, Xiaobo Li, Xinbi Liu, Hongjian Peng, Yaozhuang Nie
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.1012019
Abstract: System Science Philosophy is a knowledge system constructed of universal principle and law sequences. Alloy gene is a characteristic atom existing in the center of coordination cluster and occupying the lattice point of a lattice cell, and carries holographic information about valence electron structure, physical and thermodynamic properties obtained by alloy gene theory. Alloy gene potential energy curve function has developed traditional atom pair interaction potential functions into many atoms’ interaction function associated with valence electron structure, bond length, bond energy, which makes alloy gene Gibbs energy function can be established. Alloy gene Gibbs energy transmissive function has developed traditional partition function. Its equilibrium and sub-equilibrium transmissive modes produce alloy holographic network positioning bank, which is operable platform to achieve transformation from “trial and error” method to the “whole obtained from a few part” law for getting advanced alloys. It has become possible to launch alloy gene sequence project.
Risk of Cardiovascular Disease Associated with the Exposure of Particulate Matter (PM2.5): Review  [PDF]
Rabina Sinkemani, Arjun Sinkemani, Xiaobo Li, Rui Chen
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.96038
Abstract: Association of particulate matter (PM2.5) increases the risk of cardiovascular disease. Experimental and clinical evidences suggested that PM2.5 is directly linked with cardiovascular disease. PM2.5 also plays an important role in the biological mechanisms influencing in the cardiovascular system. Here in this review, we tried to discuss that PM2.5 is associated with the increase risk of cardiovascular disease in which PM2.5 air pollutants enter through the alveolar of the lungs through the systemic circulation inducing cardiovascular disease. More studies need to be done for further understanding to clarify the interactions of PM2.5 components associated with cardiovascular disease.
Valence bond structure of Ta-W alloys

Xiaobo LI,Youqing XIE,

金属学报(英文版) , 2009,
Abstract: The valence bond structure of substitutional BCC based Ta-W alloys is studied using characteristic crystal(CC)theory.This theory is based on cluster statistics of random alloys.By studying the correlativity between energy and volume of the CC in Ta-W alloys,the valence bond structure of CC is determined by the energy and shape method.Then,following additive law of CC,the valence bond structure of Ta-W alloys is calculated.It is found that the outer shell valence electronic distribution of Ta-W alloys shows ...
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