期刊：
Journal of Instrumentation,2013年8(1):T01004 ISSN：1748-0221
通讯作者：
Tan, Y.
作者机构：
[Yuan, H.; Tan, Y.] Hengyang Normal Univ, Dept Phys & Elect, Hengyang City, Peoples R China.;[Xiao, D.; Tang, Q.; Liu, X.; Tan, Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang City, Peoples R China.;[Tan, Y.] Hengyang Normal Univ, Dept Phys & Elect, Huangbai Rd, Hengyang City, Peoples R China.
通讯机构：
[Tan, Y.] H;Hengyang Normal Univ, Dept Phys & Elect, Huangbai Rd, Hengyang City, Peoples R China.
关键词：
Data acquisition concepts;Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases);Models and simulations
摘要：
We propose a novel method for quickly measuring the radon exhalation rate in open loop. We first obtain the temporal variation of radon concentration in the internal cell of the RAD7 by analyzing the work principle of RAD7. We then obtain the temporal variation of radon concentration in the ventilation-type accumulation chamber when the effects of leakage and back diffusion are neglected. This method uses the measured value before the radon concentration in the ventilation-type accumulation chamber reaches a steady state. The diameter of the air input tube to the ventilation-type accumulation is large enough to keep the differential pressure in the accumulation chamber and outdoors negligible. Short cycle time and large flow rate will be appropriate for reducing measurement error. Several radon exhalation rate measurements of the medium surface have been performed in the Radon Laboratory of the University of South China. The radon exhalation rates obtained by verification experiments are in good agreement with the reference value. This method can be applied to develop and improve the instruments for measuring radon exhalation rate.
作者机构：
[Tan, Yanliang] Hengyang Normal Univ, Dept Phys & Elect, Hengyang, Peoples R China.;[Tan, Yanliang; Xiao, Detao] Univ South China, Sch Nucl Sci & Technol, Hengyang, Peoples R China.
通讯机构：
[Tan, Yanliang] H;Hengyang Normal Univ, Dept Phys & Elect, Hengyang, Peoples R China.
关键词：
RAD7;Soil;Thoron exhalation rate
摘要：
Thoron exhalation rate can be obtained through the combination of the "accumulation chamber" technique and RAD7. Thoron's rapid decay causes the intake path and the air flow rate to become important factors in calibration. In field conditions, since the flow rate of the internal pump in RAD7 will change as the voltage of the battery decreases, the big drying tube is more suitable for a long measurement than the small drying tube. We developed the method for recalibration of the thoron concentration reading of RAD7 based on the calibration factor for 222Rn, and obtained the thoron exhalation rate from soil surface near by the Radon Laboratory of the University of South China. This method can be applied to develop and improve instruments for measuring the radon exhalation rate.
摘要：
A method was established to quantitatively estimate sources of atmospheric carbonaceous matter, using a combination of radiocarbon technology, linear regression of organic carbon (OC) -K+ and elemental carbon (EC) tracer method. Fractional contributions of fossil fuels, biomass burning, biogenic secondary organic carbon (BSOC) and soil dust to the atmospheric size-resolved carbonaceous matters in Shanghai suburb were estimated using this new method. The fossil carbon contributed most of the OC in particles smaller than 0.49 μm, and its fraction decreased with the increase of particle size. Biomass burning contributed 17–28 % to the OC. The BSOC contributed comparable proportions to the OC in particles smaller than 3.0 μm with the biomass burning, but larger in the particles lager than 3.0 μm. The soil dust contributed least fraction to the OC of each size with a proportion of 2–13 %. The biomass burning and fossil sources shared comparable fraction of the EC in all size range.
摘要：
Heating of ions by two Alfvén waves propagating along an external magnetic field via nonresonant wave-particle interaction in low-β plasmas is studied using test-particle simulation. Due to subcyclotron ion resonance, the heating effect of the left-hand polarized Alfvén wave pair is 10% greater than that of the right-hand polarized pair. The results show that the perpendicular and parallel (to the external magnetic field) temperatures, as well as the parallel fluid velocity, vary sinusoidally with the phase difference. Furthermore, the magnitude of the oscillations decreases with the ratio of the frequencies of the two waves. When the frequency ratio reaches above 2, the effect of the phase difference vanishes.
摘要：
In this paper, we construct a new phenomenological isospin dependent global neutron nucleus optical model potential. Based on the existing experimental data of elastic scattering angular distributions for neutron as projectile, we obtain a set of the isospin dependent global neutron-nucleus optical model potential parameters, which can basically reproduce the experimental data for target nuclei from (24)mg to Pu-242 with the energy region up to 200 MeV. (C) 2011 Elsevier B.V. All rights reserved.
摘要：
A wireless sensing method for the measurement of gamma radiation dose has been developed based on the fact that gamma rays can initiate the polymerization of acrylamide, which causes an increase in solution viscosity that can be detected with a wireless magnetoelastic sensor. The magnetoelastic sensor is able to wirelessly detect the resonance frequency shifts of a magnetoelastic foil in response to changes in solution viscosity. There is a linear relationship between the resonance frequency shift and gamma radiation dose in the range of 0–50 Gy (under optimal conditions) with a detection limit of 0.25 Gy. This method has the advantage of providing real-time, continuous measurement in situ. The method has been used successfully to determine the gamma radiation dose in real exposure scenarios, with satisfactory results.
作者：
Yu, Jun*;Dong, J. Q.;Li, X. X.;Du, D.;Gong, X. Y.
期刊：
Journal of Plasma Physics,2012年78(6):651-655 ISSN：0022-3778
通讯作者：
Yu, Jun
作者机构：
[Du, D.; Yu, Jun] Univ S China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Dong, J. Q.] Zhejiang Univ, Inst Fus Theory & Simulat, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China.;[Dong, J. Q.] SW Inst Phys, Chengdu, Peoples R China.;[Li, X. X.; Gong, X. Y.] Univ S China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Yu, Jun] U;Univ S China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
摘要：
Excitation of the geodesic acoustic mode continuum by drift wave turbulence is studied using the wave kinetic approach. For a model profile of weak non-uniform ion temperature, the forms of growth rate and radial structure of geodesic acoustic modes are obtained analytically. The growth rate is analyzed for several conditions for present-day tokamaks and compared with that for uniform ion temperature, as well as that given by the coherent mode approach for non-uniform ion temperature.
作者：
Du, Dan*;Gong, Xueyu;Wang, Zhenhua;Yu, Jun;Zheng, Pingwei
期刊：
Journal of Plasma Physics,2012年78(6):595-599 ISSN：0022-3778
通讯作者：
Du, Dan
作者机构：
[Du, Dan; Yu, Jun] Univ S China, Dept Math & Phys, Hengyang City, Hunan, Peoples R China.;[Wang, Zhenhua; Gong, Xueyu] Univ S China, Dept Nucl Sci & Technol, Hengyang City, Hunan, Peoples R China.;[Zheng, Pingwei] Univ S China, Dept Environm Protect & Safety Engn, Hengyang City, Hunan, Peoples R China.
通讯机构：
[Du, Dan] U;Univ S China, Dept Math & Phys, Hengyang City, Hunan, Peoples R China.
摘要：
A well-optimized design of an ion cyclotron resonance heating (ICRH) antenna is very important for steady-state plasma heating with high radio frequency (RF) power of several tens of megawatts. However, a sharp decrease in the coupling RF power because of impedance mismatch of ICRH system is an issue that must be resolved for present-day fusion reactors and International Thermonuclear Experimental Reactor. This paper has theoretically analyzed the ICRH antenna's impedance matching for ELMy plasmas on experimental advanced superconducting tokamak (EAST) by the transmission line theory. The results indicate that judicious choice of the optimal feeder location is found useful for adjustable capacitors' tolerance to the variations of the antenna input impedance during edge-localized mode (ELM) discharge, which is expected to be good for the design of ICRH antenna system and for real-time feedback control during ELM discharge on EAST.
期刊：
Journal of Instrumentation,2012年7(8):T08004 ISSN：1748-0221
通讯作者：
Tan, Y.
作者机构：
[Tan, Y.] Hengyang Normal Univ, Dept Phys & Elect, Hengyang City, Peoples R China.;[Xiao, D.] Univ S China, Sch Nucl Sci & Technol, Hengyang City, Peoples R China.;[Tan, Y.] Hengyang Normal Univ, Dept Phys & Elect, Huangbai Rd, Hengyang City, Peoples R China.
通讯机构：
[Tan, Y.] H;Hengyang Normal Univ, Dept Phys & Elect, Huangbai Rd, Hengyang City, Peoples R China.
关键词：
Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases);Data acquisition concepts
期刊：
BOUNDARY VALUE PROBLEMS,2012年2012(1):1-13 ISSN：1687-2770
通讯作者：
Ouyang, Zigen
作者机构：
[Li, Gangzhao; Ouyang, Zigen] Univ South China, Sch Nucl Sci & Technol, Sch Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[Ouyang, Zigen] U;Univ South China, Sch Nucl Sci & Technol, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
Banach Space;Real Number;Integral Equation;Green Function;Fractional Order
摘要：
A class of nonlinear fractional order differential equation
is investigated in this paper, where
is the standard Riemann-Liouville fractional derivative of order
,
,
. Using intermediate value theorem, we obtain a sufficient condition for the existence of the solutions for the above fractional order differential equations.
作者：
Sun, Y. L.;Huang, W. X.*;Tian, Y. L.;Zhao, J. M.;Wang, J. Y.;...
期刊：
Journal of Instrumentation,2012年7(07):P07005 ISSN：1748-0221
通讯作者：
Huang, W. X.
作者机构：
[Huang, W. X.; Zhu, Z. C.; Tian, Y. L.; Wang, J. Y.; Wang, Y. S.; Wang, Y.; Sun, Y. L.; Zhao, J. M.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.;[Tian, Y. L.; Sun, Y. L.] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China.;[Zhu, Z. C.] Univ S China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Huang, W. X.] C;Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.
关键词：
Analogue electronic circuits;Instrumentation for radioactive beams (fragmentation devices;fragment and isotope, separators incl. ISOL;isobar separators;ion and atom traps;weak-beam diagnostics;radioactivebeam ion sources)
