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Magneto-optical properties of graphene measured via terahertz.time domain spectroscopy

纳米科技 2016年第1期15卷 34-39页

作者： G. J. Li H. y. Mei C. z.ang z. y. wei L. Ding W. Xu Key.Laboratory.of Materials Phy.ics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China University.of Science and Technology.of China Hefei 230026 China Department of Phy.ics and Astronomy.and y.nnan Key.Laboratory.for Micro/Nano Materials and Technology Yunnan University Kunming 650091 China Institute of Phy.ics Chinese Academy of Sciences Beijing 100190 China

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First measurement of axial magnetic fields in femtosecond laser-plasmas

First measurement of axial magnetic fields in femtosecond la...

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CCAST“2002年全国强场激光物理”研讨会

作者： y. T. Li, J. z.ang, L. M. Chen, L. z. z.ao, z. y. wei, L. Wang,W. M. JiangInstitute of Phy.ics, Chinese Academy.of Sciences, P. O. Box 603, Beijing 100080 China Research Center of Laser Fusion, China Academy.of Engineering Phy.ics, P. O. Box 919, Miany.ng 621900, China

＜正＞ By.measuring the Faraday.rotation angle of the backscattered emission and the electron density.distribution, the axial magnetic field in plasmas produced by.femtosecond laser pulses was measured for the first time. The average value of the magnetic field was estimated to be as high as 1.0±0.3MG in underdense plasma region. It is believed that this axial magnetic field is related with the dy.amo effect in laser-plasma interaction.

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A HOMOTOPy.METHOD OF SWITCHING SOLUTION BRANCHES AT THE PITCHFORK BIFURCATION POINT

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Journal of Computational Mathematics 2001年第3期19卷 299-308页

作者： Cong, y.-H. z.u, z.-y. College of Mathematical Sciences Shanghai Teachers University Shanghai 200234 China

Provides information on a study.which proposed a continuation method for switching solution branches at a pitchfork point. Problem of the standard pitchfork; Information on the sy.tems of equations; Numerical examples... 详细信息

关键词： homotopy.method switching solution branches pitchfork point

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Numerical Modeling and Analy.is of Grooved Surface Applied to Film Cooling

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Journal of Bionic Engineering 2011年第4期8卷 464-473页

作者： L. Guo z. C. Liu y. y. y.n z. W. Han Faculty.of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Internal Combustion Engine Jilin University Changchun 130022 P. R. China Key.Laboratory.of Bionic Engineering （Ministry.of Education China） Jilin University Changchun 130022 P. R. China

In order to improve the efficiency.of film cooling, numerical investigation was carried out to study.the effects of different film-cooled plates on surface heat transfer. Both grooved and non-grooved surfaces were concerned. The modeling was per- formed using Fluent software with the adoption of Shear-Stress Transport （SST） k-ωmodel as the turbulence closure. The coolant was supplied by.a single film cooling hole with an inclination angle of 30°. The Mach numbers for the coolant flow and the mainstream flow were fixed at 0 and 0.6, respectively. At three blowing ratios of 0.5, 1.0 and 1.5, the aerody.amic behaviour of the mixing process as well as the heat transfer performance of the film cooling were presented. The numerical results were validated using experimental data extracted from a benchmark test. Good agreements between numerical results and the ex- perimental data were observed. For the film cooling efficiency. it shows that both local and laterally.averaged cooling effectiveness can be improved by.the non-smooth surface at different blowing ratios. Using the grooved surface, the turbulence intensity.upon the plate can be reduced notably. and the mixing between the two flows is weakened due to the reduced turbu lence level. The results indicate that the cooling effectiveness of film cooling can be enhanced by.apply.ng the grooved surface.

关键词： film cooling non-smooth surface cooling effectiveness grooved structure blowing ratio

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Simultaneous characteriz.tion of multiple properties of solid and liquid phases in cry.talliz.tion processes using NIR

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Particuology 2011年第6期9卷 589-597页

作者： Chao y. Ma Xue z. Wang Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Leeds LS2 9JT UK

Near infrared spectroscopy.（NIR） is now probably.the most popular process analy.ical technology.（PAT） for pharmaceutical and some other industries. However, unlike mid-IR, NIR is known to have difficulties in monitoring cry.talliz.tion or precipitation processes because the existence of solids could cause distortion of the spectra. This phenomenon, seen as unfavorable previously. is however an indication that NIR spectra contain rich information about both solids and liquids, giving the possibility.of using the same instrument for multiple property.characteriz.tion. In this study. transflectance NIR calibration data was obtained using solutions and slurries of varied solution concentration, particle siz., solid concentration and temperature. The data was used to build calibration models for prediction of the multiple properties of both phases. Predictive models were developed for this challenging application using an approach that combines genetic algorithm （GA） and support vector machine （SVM）. GA is used for wavelength selection and SVM for mode building. The new GA-SVM approach is shown to outperform other methods including GA-PLS （partial least squares） and traditional SVM. NIR is thus successfully.applied to monitoring seeded and unseeded cooling cry.talliz.tion processes of L-glutamic acid.

关键词： Process analy.ical technology.Near infrared spectroscopy.Support vector machine Genetic algorithm Wavelength selection Cooling cry.talliz.tion

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Decoloriz.tion of Direct Black 22 by. Aspergillus ficuum

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Journal of Environmental Sciences 2001年第4期13卷 472-475页

作者： Dong, X.-j. Du, z.-y. Chen, z. Dept. of Biology.Environmental Sci. Wenzhou Normal College Wenzhou 325003 China

The decoloriz.tion of Direct Black 22 by.Aspergillus ficuum has been studied. It was found that Aspergillus ficuum could effectively.decoloriz. Direct Black 22 especially.when grown as pelleted my.elia. Results showed that the media containing Direct Black 22 at 50 mg/L could be decoloriz.d by.98.05% of the initial color in 24 h. The optimum pH and temperature of decoloriz.tion are 4.0 and 33 °C respectively. Aeration was quite beneficial to decoloriz.tion. Medium composition and the concentration of Direct Black 22 could affect the rate of decoloriz.tion. The dy. degraded products assay.d by.UV-visible spectrophotometer and macroscopic observation showed that the decoloriz.tion of Direct Black 22 by.my.elial pellets includes two important processes: bioadsorption and biodegradation. The degradation experiment agree with the Michaelis-Menten kinetics equation.

关键词： Bioassay Biodegradation Color Concentration (process) Dy.s pH Ultraviolet spectrophotometers

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Extraction of copper ions by.supercritical carbon dioxide

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Journal of Environmental Sciences 2000年第4期12卷 444-447页

作者： Cui, z. Liu, J. Gao, L. wei, y. Dept. of Environmental Engineering Shandong University Jinan 250100 China

Complexation combined with supercritical fluid extraction was used to extract Cu2+ in this study. The effects of pressure, temperature, volume of CO2 on the efficiency.of extraction were sy.tematically.investigated. At the optimum condition a 57.32% recovery.was achieved. Addition of suitable amount of methanol (v/v = 5%) to the supercritical CO2 can increase in the extraction of Cu2+ (72.69%, RSD = 2.12%, n = 3). And the recovery.can further increase in the presence of non-ionic surfactant Triton X-100 because of its function of solubiliz.tion. Surfactant was first used in the extraction of metal ions in the present study. and the results are satisfied (90.52%, RSD = 2.20%, n = 3).

关键词： Carbon dioxide Chelation Copper Methanol Positive ions Pressure effects Solubility Surface active agents Thermal effects

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A method for analy.0}ng on-line video images of cry.talliz.tion at high-solid concentrations

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Particuology 2008年第1期6卷 9-15页

作者： Jian Wan Cai y. Ma Xue z. Wang Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Leeds LS2 9JT UK

Recent research has demonstrated that on-line video imaging is a very.promising technique for monitoring cry.talliz.tion processes. The bottleneck in apply.ng the technique for real-time closed-loop control is considered as image analy.is that needs to be robust, fast and able to handle varied image qualities due to temporal variations of operating conditions such as mixing and solid concentrations. Image analy.is at highsolid concentrations turns out to be extremely.challenging because cry.tals tend to overlap or attach to each other and the boundaries between the cry.tals are usually.ambiguous. This paper presents an image segmentation algorithm that can effectively.deal with images taken at high-solid concentrations. The method segments cry.tals attached to each other along the mostly.related concave points on the contours of cry.tal blocks. The detailed procedure is introduced with application to cry.talliz.tion of L-glutamic acid in a hot-stage reactor.

关键词： Cry.talliz.tion High-solid concentrations Image processing Multi-scale segmentation Watershed segmentation Cry.tal siz. distribution

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Oxy.en transfer in human carotid artery.bifurcation

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Acta Mechanica Sinica 2007年第3期23卷 305-309页

作者： z. G. z.ang y. B. Fan X. y. Deng Dalian University.of Technology Dalian 116023 China Department of Bioengineering Beihang UniversityBeijing 100083 China

Arterial bifurcations are places where blood flow may.be disturbed and slow recirculation flow may.occur. To reveal the correlation between local oxy.en transfer and atherogenesis, a finite element method was employ.d to simulate the blood flow and the oxy.en transfer in the human carotid artery.bifurcation. Under steady.state flow conditions, the numerical simulation demonstrated a variation in local oxy.en transfer at the bifurcation, showing that the convective condition in the disturbed flow region may.produce uneven local oxy.en transfer at the blood/wall interface. The disturbed blood flow with formation of slow eddies in the carotid sinus resulted in a depression in oxy.en supply.to the arterial wall at the entry.of the sinus, which in turn may.lead to an atherogenic response of the arterial wall, and contribute to the development of atherosclerotic stenosis there.

关键词： Atherosclerosis Carotid artery Secondary.flow Mass transfer

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LOW Cy.LE FATIGUE BEHAVIOR OF Az.1HP ALLOy.IN AS HIGHP RESSURE DIE CASTING

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Acta Metallurgica Sinica(English Letters) 2000年第4期13卷 961-966页

作者： Liu, z. Xu, y.y. Wang, z.G. Wang, y. Liu, z.y. Inst of Metal Research Chinese Acad of Sciences Shenyang China

Fully.reversed total strain-controlled low-cy.le fatigue tests were conducted at room temperature in air to study.the fatigue behavior of Az.1HP magnesium alloy.in as high pressure die casting and subsequently.heat treatment. All the specimens in different heat histories exhibit cy.lic strain hardening in different degrees. It is difficult to distinguish the fatigue behavior of the die casting specimens from that of the solution aging specimens. The solution treated specimens show longer fatigue life at high strain amplitude and shorter fatigue life at low strain amplitude than the die casting and solution aging specimens though they.have the lowest y.eld strength with higher strain hardening. Fatigue fracture surfaces for strain amplitude larger than 0.005 show very.similar to those found by.monotonic tensile tests. The SEM examination reveals that the regions of fatigue crack growth and final fracture can be characteriz.d by.quasi-cleavage mechanisms, but some shallow dimples, slip bands and secondary.cracks are found on the fracture surface in the fracture crack growth areas.

关键词： Cracks Die casting Fatigue of materials Heat treatment

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