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Search Results: 1 - 10 of 155400 matches for " Dong-sheng LI "
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The Flow Measurement of Multiphase Flow Based on the Conductance Sensor  [PDF]
Rui-Rong Dang, Dong-Sheng Zhao, Li-Pin Li, Guang Yin
Modern Instrumentation (MI) , 2012, DOI: 10.4236/mi.2012.14005
Abstract: Oil-gas-water three-phase flow in the pipe is commonly encountered in the petroleum and nature gas industry. Its flow patterns are complex and always changeable, so it’s difficult to be measured and is becoming one of the most important subjects. Moreover, most of the oil fields in China are in such a high water fraction period that measures must be taken to meet the needs of the actual production. A conductance sensor which is widely used in the measurements of oil-water two-phase flow is used to measure the flow rate of the three-phase flow based on the research of the characteristics and the correlation theory, and a new technical solution which is suitable for measuring the oil-gas-water three-phase flow is established. A series of tests demonstrate that it’s feasible to use the conductance sensor in the measurements of oil- gas-water three-phase flow.
Study of W-Exchange Mode D0 → ФK0
DU Dong-Sheng,LI Ying,Lü Cai-Dian
中国物理快报 , 2006,
Abstract: We calculate the branching ratio of rare decay D^0→ФK using the perturbative QCD factorization approach based on kT factorization. Our result shows this branching ratio is (8.7 ± 1.4) x 10^-3, which is consistent with experimental data. We hope that the CLEO-C and BES-Ⅲ can measure it more accurately, which will help us to understand QCD dynamics and D meson weak decays.
The study of $B\to J/\Psi \eta^{(\prime)}$ decays and determination of $\eta-\eta^{\prime}$ mixing angle
Li, Jing-Wu;Du, Dong-Sheng
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.78.074030
Abstract: We study $B\to J/\Psi \eta^{(\prime)}$ decays and suggest two methods to determine the $\eta-\eta^{\prime}$ mixing angle. We calculate not only the factorizable contribution in QCD facorization scheme but also the nonfactorizable hard spectator corrections in pQCD approach. We get the branching ratio of $B\to J/\Psi \eta$ which is consistent with recent experimental data and predict the branching ratio of $B\to J/\Psi \eta^{\prime}$ to be $7.59\times 10^{-6}$. Two methods for determining $\eta-\eta^{\prime}$ mixing angle are suggested in this paper. For the first method, we get the $\eta-\eta^{\prime}$ mixing angle to be about $-13.1^{\circ}$, which is in consistency with others in the literature. The second method depends on less parameters so can be used to determine the $\eta-\eta^{\prime}$ mixing angle with better accuracy but needs, as an input, the branching ratio for $B\to J/\Psi \eta^{\prime}$which should be measured in the near future.
Development of Networked Virtual Experiment System Based on Virtual Campus
Tian-tai Guo,Lin GUO,Dong-sheng LI
International Journal of Modern Education and Computer Science , 2009,
Abstract: China’s higher education has been going through a period of rapid expansion in undergraduate population,and this means a much heavier demand on teaching resources such as laboratories, experiments, teaching staff,etc., which cannot possibly be made available all of a sudden.To deal with this situation, we found virtual reality (VR) technology very helpful. Virtual reality (VR) has found many applications in education; and the resources of virtual education such as virtual campus, virtual laboratory etc. are used more and more widely, especially in the field of higher education. But so far virtual campus was mainly regarded as a means of image exhibition, and virtual laboratories were no more than 2D display of experimental processes and equipments. To make better use of these resources, this paper puts forward the concept of networked virtual experiment systems based on virtual campus by combining the virtual laboratory and virtual campus with the technique of LAN (Local area network), and establishes its theoretical model. Finally, a networked virtual experiment system based on virtual campus is developed using VRML and 3DSMAX. Networked virtual experiment system based on virtual campus has a promising future for various applications in higher education.
1,3-Di-4-pyridylpropane–4,4′-oxydibenzoic acid (1/1)
Wen-Wen Dong,Dong-Sheng Li,Jun Zhao,Long Tang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808034971
Abstract: In the title compound, C13H14N2·C14H10O5, a 1:1 cocrystal of 1,3-di-4-pyridylpropane (bpp) and 4,4′-oxydibenzoic acid (H2oba), the dihedral angle between the two benzene rings of the flexible H2oba molecule is 57.07 (1)°; the two pyridine rings of bpp make a dihedral angle of 27.52 (1)°. Strong intermolecular O—H...N hydrogen bonds link the molecules into chains, which are then linked into a three-dimensional network through intermolecular C—H...O and π–π stacking interactions [centroid–centroid distance = 3.7838 (3) ].
Bis(di-2-pyridylmethanediol-κ3N,O,N′)copper(II) dl-tartrate
Jun Zhao,Dong-Sheng Li,Wen-Wen Dong,Dan-Jun Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808034983
Abstract: The reaction of di-2-pyridyl ketone with copper dichloride dihydrate and tartaric acid in water afforded the title compound, [Cu(C11H10N2O2)2]C4H4O6. The CuII atom lies on an inversion center N,O,N′-chelated by two di-2-pyridylmethanediol ligands in a tetragonally distorted octahedral geometry. The tartrate anion is also located on an inversion center and has disordered hydroxyl groups, each with an occupancy factor of 0.5. The hydroxyl groups of the complex cation are hydrogen bonded to the carboxylate groups of the anion, thus connecting the two building units.
catena-Poly[[(1,10-phenanthroline-κ2N,N′)copper(I)]-μ-thiocyanato-κ2N:S-[(1,10-phenanthroline-κ2N,N′)copper(I)]-μ-cyanido-κ2N:C]
Jun Zhao,Wen-Wen Dong,Dong-Sheng Li,Xi-Jun Ke
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808037744
Abstract: In the title complex, [Cu2(CN)(NCS)(C12H8N2)2], which was synthesized under hydrothermal conditions, both CuI atoms have a slightly distorted tetrahedral geometry. They are coordinated by two N atoms of one 1,10-phenanthroline ligand, one bridging thiocyanate anion and one bridging cyanide anion. In the crystal structure, infinite helical {Cu–CN–Cu–SCN}n chains are formed along [{overline 1}01].
catena-Poly[[(2,2′-bipyridine-κ2N,N′)copper(I)]-μ-cyanido-κ2C:N-[(2,2′-bipyridine-κ2N,N′)copper(I)]-μ-thiocyanato-κ2S:N]
Jun Zhao,Wen-Wen Dong,Dong-Sheng Li,Qiu-Fen He
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808037756
Abstract: The title compound, [Cu2(CN)(SCN)(C10H8N2)2]n, contains two crystallographically independent CuI atoms, each in a distorted tetrahedral geometry. Each Cu atom is coordinated by a bidentate chelating 2,2′-bipyridine ligand. A bridging cyanide anion links the two Cu(2,2′-bipyridine) units to form a binuclear unit. Adjacent binuclear units are connected by a thiocyanate anion into a one-dimensional helical chain along [010]. The cyanide anion is disordered, with each site occupied by both C and N atoms in an occupancy ratio of 0.61 (5):0.39 (5). The S atom of the thiocyanate anion is also disordered over two sites, with occupancy factors of 0.61 (3) and 0.39 (3). There are π–π interactions between the pyridyl rings of neighbouring chains [centroid–centroid distance = 3.82 (1) ].
4,4′-(Ethene-1,2-diyl)dipyridinium bis[4-(2-carboxybenzoyl)benzoate]
Cai Li,Dong-Sheng Li,Jun Zhao,Xue-Gang Zheng
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809048417
Abstract: In the crystal structure of the title compound, C12H12N22+·2C15H9O5 , the cation has site symmetry overline{1} with the mid-point of C=C bond located on an inversion center. The two benzene rings of the anion are oriented at a dihedral angle 85.87 (6)°. In the crystal, intermolecular O—H...O and N—H...O hydrogen bonds link the cations and anions into supramolecular double chains, which are further connected into a three-dimensional network through intermolecular C—H...O and π–π stacking between parallel pyridine rings [centroid–centroid distance = 3.4413 (12) ] and between parallel benzene rings [centroid–centroid distance = 3.6116 (14) ].
Effects on the pouch of different digestive tract reconstruction modes assessed by radionuclide scintigraphy
Dong-Sheng Li, Hui-Mian Xu, Chun-Qi Han, Ya-Ming Li
World Journal of Gastroenterology , 2010,
Abstract: AIM: To determine the effect of three digestive tract reconstruction procedures on pouch function, after radical surgery undertaken because of gastric cancer, as assessed by radionuclide dynamic imaging.METHODS: As a measure of the reservoir function, with a designed diet containing technetium-99m (99mTc), the emptying time of the gastric substitute was evaluated using a 99mTc-labeled solid test meal. Immediately after the meal, the patient was placed in front of a γ camera in a supine position and the radioactivity was measured over the whole abdomen every minute. A frame image was obtained. The emptying sequences were recorded by the microprocessor and then stored on a computer disk. According to a computer processing system, the half-emptying actual curve and the fitting curve of food containing isotope in the detected region were depicted, and the half-emptying actual curves of the three reconstruction procedures were directly compared.RESULTS: Of the three reconstruction procedures, the half-emptying time of food containing isotope in the Dual Braun type esophagojejunal anastomosis procedure (51.86 ± 6.43 min) was far closer to normal, significantly better than that of the proximal gastrectomy orthotopic reconstruction (30.07 ± 15.77 min, P = 0.002) and P type esophagojejunal anastomosis (27.88 ± 6.07 min, P = 0.001) methods. The half-emptying actual curve and fitting curves for the Dual Braun type esophagojejunal anastomosis were fairly similar while those of the proximal gastrectomy orthotopic reconstruction and P type esophagojejunal anastomosis were obviously separated, which indicated bad food conservation in the reconstructed pouches.CONCLUSION: Dual Braun type esophagojejunal anastomosis is the most useful of the three procedures for improving food accommodation in patients with a pouch and can retard evacuation of solid food from the reconstructed pouch.
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