
Wang FengTongji University
Wang Feng
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27
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Publications (27)
Initial laser indirect-driven integrated experiment was carried out on the new-established Shenguang III laser facility. The shaped laser pulses from multi-rings were injected into a hohlraum and converted to X-ray emissions. According to the control of the drive asymmetry by the optimization of the laser parameter, the quasi one-dimensional implod...
Laser indirect-drive has the potential to obtain ultra-high pressure which is very useful for shock physics. The isentropic compression can be obtained with reservoir target in laser indirect-drive experiment. The free surface velocity and interface velocity are the two important parameters in isentropic compression experiment. The efficiency with...
Xu Tao Mei Yu Wei Huiyue- [...]
Yan Yadong
A full aperture backscattering light diagnostic system (FABLDS) implemented on the Shen Guang-III Prototype Laser Facility is described in the paper. FABLDS measures both stimulated brillouin scattering (SBS) and stimulated Raman scattering (SRS) with a series of optical detectors. Energy sensors record the integrated energy, and streak cameras cou...
Laser and plasma interaction (LPI) is the important part for the study of inertial confinement fusion (ICF). In order to have an investigation for the energy and spectrum of scattered light produced by laser-plasma interaction in Shen Guang- III prototype laser facility, a backscattered light diagnostic system was developed. This paper introduces t...
The quasi-isentropic compression of material with high strain rate can be obtained by the ramp wave loading of plasma jet produced by laser-driven reservoir target. The quasi-isentropic compression experiments of aluminum are carried out on the high power laser facility of SG-III prototype. The smooth and continuous speed history of free surface of...
Detailed research on the interaction of a 0.53 {mu}m laser pulse with millimeter-scale plasmas produced by a gasbag target on the Shengguang-II facility is presented. The x-ray pinhole images confirm that millimeter-scale plasmas are generated and the x-ray framing images show a temporal window of 0.6-1.1 ns during which the millimeter-scale plasma...
The timing of multiple shock waves is crucial technique to the performance of inertial confinement fusion ignition targets. With the requirement for shock timing, the timing ability of Shen Guang-III prototype is analyzed by experimental data of two shots. The laser pulse in Shen Guang-III prototype is shaped in time scale, and the window material...
With the ionization mechanism for the transparent material under the super high pressure, the basic measurement method of shock wave has been analyzed. With the Drude-free electron model, the change in reflectivity of shock wave front under different pressures has been analyzed. The reflectivity of shock wave front for different probe lasers has be...
Laser indirect-drive has the potential to get ultra-high pressure which is very useful for shock physics. The sandwiched target is used to suppress the ionization effect which causes the blanking area in optical streak camera (OSC) in indirect-drive experiment. The blanking effect can be avoided by the time scale and the intensity. With the thick a...
The shock timing experiment in ablator material wave, where the shock wave transferring and catching up are investigated, can be simulated with an inertial confinement fusion planar target. The photo ionization effect caused by the X-ray from Hohlraum target is explained. With the simulation data, the block effects of Au and Cu for shock wave are a...
Poisson line technique is a method of generating a straight line by diffraction for high precision alignment,which can keep the center of Poisson spot in this line at long distances (several tens or hundreds of meters). Numerical simulation and experimental demonstration are proposed to research this technique. The intensity of the line increases a...
A new scheme to monitor the photoinduced bleaching procedure with ultraviolet light based on surface plasmon resonance (SPR) using attenuated total reflection configuration is presented. The configuration, which is very sensitive to the changes of refractive index and nonlinear optical (NLO) coefficient of polymer, can prevent the effect of the fun...
In this paper, a model is developed for the performance analysis of IEEE 802.11b and Bluetooth systems in mutual interference environment. Based on this model, a scheme is proposed to select appropriate parameters, such as packet type, packet segmentation size, an adaptive data rate and transmit distance. Consequently the proposed scheme allows the...
There is no central control mechanism in Bluetooth and IEEE 802.11b to coordinate their communication behavior and prevent collisions between them. To combat the interference, Bluetooth just hops to another frequency and retransmits the collided packet, while 802.11b transmitters will back off for a while then retransmit the packet again. In genera...
The two technologies, IEEE 802.11b and Bluetooth, have been growing rapidly for the past few years. Since both systems operate the same 2.4 GHz frequency band, it is anticipated some interference between these two systems. In this paper, the performance of IEEE 802.11b network is evaluated in the presence of Bluetooth piconets using probabilistic a...
The performance of a Bluetooth medium access control layer is evaluated when the radio is operating in close proximity to other Bluetooth piconets and 802.11 wireless local area networks. The packet error rate of a Bluetooth piconet and the aggregated throughput of N collocated Bluetooth piconets are given.
The IEEE 802.11 and Bluetooth wireless networks can provide complimentary services and they are likely to be installed within the same environments. Since both networks operate in the same ISM frequency band, the networks will be impaired if the probability of packet collision between the networks is sufficiently large. In this paper, the performan...
Bluetooth is a digital wireless data transmission standard in the 2.4 GHz ISM band aimed at providing a short range wireless link between laptops, cellular phones and other devices. The IEEE 802.11 wireless local area networks (WLANs) also operate in this frequency band. Since both systems operate in the same frequency band, there can be interferen...
As recently as twenty-five years ago, there were virtually no demographers of China and there was little available data on Chinese demographic behavior. Thus in spite of intense interest in China's population dating back at least to Malthus (1766–1834), his initial understanding, or rather misunderstanding, of Chinese population dynamics remains do...
During the last decade in this journal and elsewhere we and others have expanded our understanding of Chinese population behavior. While it is not yet possible to produce reliable estimates of population size and demographic rates for China as a whole before 1950 contemporary national surveys and historical micro-studies reveal consistent patterns...
Malthus's Essay on the Principle of Population has for the past two centuries been a constant source of inspiration and debate for scholars working on relationships between population and economy in historical perspective. This book of collected essays-an outcome of an A-session held at the 12th International Congress of Economic History in Madrid,...
Demographers, as early as Malthus, have assumed that the preventive checks, delayed marriage and celibacy, were absent in traditional China. In this paper on the Qing (1644-1911) imperial lineage, we demonstrate that, instead, there may have been a different, more 'modern' preventive check: fertility control within marriage. Marital fertility of li...
Demographers, as early as Malthus, have assumed that in traditional China the positive check, mortality, was largely beyond human control. This paper re-examines the role of the positive check in late imperial China through an analysis of an historical source of unprecedented demographic detail and accuracy: the genealogy of the Qing (1644–1911) im...