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R&D Status of High-current Accelerators at IFP
J. J. Deng,J. S. Shi,W. P. Xie,L. W. Zhang,K. Z. Zhang,S. P. Feng,J. Li,M. Wang,Y. He,L. S. Xia,Z. Y. Dai,H. T. Li,L. Wen,S. F. Chen,X. Li,Q. G. Lai,M. H. Xia,Y. C. Guan,S. Y. Song,L. Chen 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
High-current accelerators have many important applications in Z-pinches, high-power microwaves, and free electron lasers, imploding liners and radiography and so on. Research activities on Zpinches, imploding liners, radiography at the Institute of Fluid Physics (IFP) are introduced. Several main high-current accelerators developed and being developed at IFP are described, such as the Linear Induction Accelerator X-Ray Facility Upgrade (LIAXFU, 12 MeV, 2.5 kA, 90 ns), the Dragon-I linear induction accelerator (20 MeV, 2.5 kA, 60 ns), and the Primary Test Stand for Z-pinch (PTS, 10 MA, 120 ns). The design of Dragon-II linear induction accelerator (20 MeV, 2.5 kA, 3 × 60 ns) to be built will be presented briefly.
Solar Water Splitting with a Hydrogenase Integrated in Photoelectrochemical Tandem Cells
Nam, Dong Heon,Zhang, Jenny Z.,Andrei, Virgil,Kornienko, Nikolay,Heidary, Nina,Wagner, Andreas,Nakanishi, Kenichi,Sokol, Katarzyna P.,Slater, Barnaby,Zebger, Ingo,Hofmann, Stephan,Fontecilla‐,Ca John Wiley and Sons Inc. 2018 Angewandte Chemie Vol.57 No.33
<P><B>Abstract</B></P><P>Hydrogenases (H<SUB>2</SUB>ases) are benchmark electrocatalysts for H<SUB>2</SUB> production, both in biology and (photo)catalysis in vitro. We report the tailoring of a p‐type Si photocathode for optimal loading and wiring of H<SUB>2</SUB>ase through the introduction of a hierarchical inverse opal (IO) TiO<SUB>2</SUB> interlayer. This proton‐reducing Si|IO‐TiO<SUB>2</SUB>|H<SUB>2</SUB>ase photocathode is capable of driving overall water splitting in combination with a photoanode. We demonstrate unassisted (bias‐free) water splitting by wiring Si|IO‐TiO<SUB>2</SUB>|H<SUB>2</SUB>ase to a modified BiVO<SUB>4</SUB> photoanode in a photoelectrochemical (PEC) cell during several hours of irradiation. Connecting the Si|IO‐TiO<SUB>2</SUB>|H<SUB>2</SUB>ase to a photosystem II (PSII) photoanode provides proof of concept for an engineered Z‐scheme that replaces the non‐complementary, natural light absorber photosystem I with a complementary abiotic silicon photocathode.</P>
Zhang, Z.H.,Fan, X.J.,Guo, H.X.,Zhang, W.,Zhang, C.Y.,Luo, F.Y. The Korean Vacuum Society 1998 Applied Science and Convergence Technology Vol.7 No.1
Amorphous ternary $Si_xC_yN-z$ thin films were obtained by plasma enhanced chemical vapor deposition(PECVD) using $N_2, SiH_4 \;and \;C_2H_4$ as the reaction sources. The chemical state were characterized by x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy(FTIR). The optical properties of the thin films were investigated by UV-visible spectrophotometer and ellipsometer, and the optical band gaps of thin films were determined from corresponding transmittance spectra following Tauc equation.
Zhang, Z.,Zhang, X.,Gong, D.,Quan, W.,Zhao, X.,Ma, Z.,Kim, S.J. Pergamon Press ; Elsevier [distribution] 2015 Atmospheric environment Vol.108 No.-
In this study, hourly and daily records since 2005 and correlation, regression and composite methods were used to analyze the long-term evolution of surface O<SUB>3</SUB> and PM<SUB>2.5</SUB> concentrations at the rural station of Shangdianzi (SDZ) and urban station of Baolian (BL) over Beijing and their relationships with meteorological conditions. The results show that the mean concentrations of PM<SUB>2.5</SUB> (O<SUB>3</SUB>) decreased (increased) at the urban and rural stations over the last decade. The linear trends of the annual mean concentrations of PM<SUB>2.5</SUB> at BL and SDZ were -31.8 ug/m<SUP>3</SUP>/10yr (-4.3%/yr) (p < 0.01) and -13.3 ug/m<SUP>3</SUP>/10yr (-2.9%/yr) (p < 0.05), respectively. In winter, the mean wind speed (W<SUB>s</SUB>) and relative humidity (RH) were the most closely correlated with O<SUB>3</SUB> at both stations, whereas RH and sunshine hours (S) were most closely correlated with PM<SUB>2.5</SUB>. The correlation coefficients and explained variances in spring and autumn were generally less than those in winter and greater than those in summer. Moreover, increase in precipitation can significantly reduce the PM<SUB>2.5</SUB> concentration in both urban and rural areas in Beijing, whereas trace and light precipitation more effectively decreases the O<SUB>3</SUB> concentration. Concentrations of PM<SUB>2.5</SUB> (O<SUB>3</SUB>) on haze days increased by 114% (3%) and 162% (20%) compared with that on non-haze days at the urban and rural stations, respectively. This result suggests that haze is a major manifestation of air pollution in Beijing.
The Updated Vversion of Chinese Evaluated Nuclear Data Library (CENDL-3.1)
Z. G. Ge,Z. X. Zhao,H. H. Xia,Y. X. Zhuang,T. J. Liu,J. S. Zhang,H. C. Wu 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The updated Chinese Evaluated Nuclear Data Library CENDL-3.1 is an important achievement based on the nuclear data evaluation works in recent years, at China Nuclear Data Center (CNDC) in cooperation with China Nuclear Data Coordination Network (CNDCN). CENDL-3.1 contains the evaluated data for reactions with incident neutrons on 240 nuclides (from ^1H to ^(249)Cf) in energy region of 10^(-5) eV-20MeV. All data obtained according to the evaluations of experimental data and the predictions of the nuclear reaction model calculations. For most important nuclei of this library, the benchmark testing and validations have been performed, the comparisons with other nuclear data libraries (ENDF/B, JENDL, BROND, JEF, et al.) have been done. The testing version of CENDL-3.1 is CENDL-3.0, which has been provided for China domestic users. Follow the using back feed of CENDL-3.0, a lot of improvement has been done. The CENDL3.1 is provided for all users by ENDF format and is released to the world in the end of 2009. The overview, evaluation methodology and some important results of new evaluations, benchmark testing and validations for this library will be introduced in this contribution.
Zhang, Z.Y.,Wong, M.S.,Lee, K.H. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.147 No.-
<P>Although visibility is a widely-used indicator to quantify the aerosol loadings, only a few studies have been analyzed the representativeness of visibility in deriving Aerosol Optical Thickness (AOT). In this paper, ground-based visibility, MODerate-resolution Imaging Spectroradiometer (MODIS) and Multi angle Imaging SpectroRadiometer (MISR) monthly AOT products between July 2002 and December 2014 were analyzed in order to extract the dominant modes of variability using the Singular Value Decomposition (SVD) method. The method has significant merit to reduce data dimension and examine both spatial and temporal variability simultaneously. Results indicated that the satellite retrieved AOTs agreed well with ground-based visibility in terms of inter-annual variability. The correlation coefficients in the first deseasonalized mode are greater than 0.65 between visibility and satellite AOT products. However, large differences were observed in the seasonal variability between ground-based visibility and AOT. In addition, Aerosol vertical distribution from LIdar climatology of Vertical Aerosol Structure for space-based lidar simulation studies (LIVAS) and cloud data from ground-based meteorological station were used to investigate the seasonal variability disagreement. The AOT values derived from LIVAS extinction coefficients between 0 and 500 m above surface have a stronger relationship with visibility, than total column AOT with visibility. It also indicates that seasonal variation of aerosol vertical distribution is the main cause of the disagreement between two parameters, and the uncertainties of satellite products also contribute to the disagreement. Results in this study highlighted that the visibility observation could only be used to depict the inter-annual AOT and more ancillary information could be used for studying seasonal AOT variation. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Some computational formulas of mixed-convoluted sum for Fibonacci and Lucas sequences
Z. Zhang,G. Xi 장전수학회 2007 Advanced Studies in Contemporary Mathematics Vol.14 No.2
In this paper, we obtain some interesting computational formulas of mixed-convolutedsum involving Fibonacci and Lucas sequences, extend some results.