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| 1 | The comparison of ensemble or deterministic dispersion modeling on global dispersion during Fukushima Dai-ichi nuclear accident显示文摘Ensemble forcasting,originally developed for weather prediction,is lately being extended to atmospheric dispersion applications,which is a new,effective methodology for improving the atmospheric dispersion numerical modeling.In March 2011,due to the massive 9.0 earthquakes and ensuing tsunami that struck off the northern coast of the island of Honshu,the Fukushima Nuclear Plant I had the substantial leak of radioactive materials into surrounding environment and atmosphere.To aim at the global dispersion modeling of atmospheric radionuclides from Fukushima Nuclear Accident,this paper presents two approaches of atmospheric dispersion forecasting:ensemble dispersion modeling(EDM) and deterministic dispersion modeling(DDM),conducts the globally dispersion modeling cases for Fukushima nuclear accident,and analyzes and evaluates the simulation results using observation data.In this paper,EDM includes three different perturbation methods:meteorological perturbation method,turbulence perturbation method,and physical parameterization ensemble forecasting method.The simulation results show that the trajectories from EDM have a better performance,which is in better agreement with the atmospheric circulation and observation data; the spread from DDM is slower and not as far as EDM.Additionally,the results from EDM display a better performance in the modeling of transport from Japan to China East Sea on April 4.The reasons for these results are:the techniques of MET and TUR are performed by adding perturbations on mean wind and turbulent velocity,respectively; the various different flow fields will result in far spreading in horizontal and the simulation results closer to observation; PHY is performed by using different diffusion physical parameterizations and produces the perturbations on vertical wind,which results the spreading in smaller range and discontinuous in horizontal.Finally,the comparative analysis between modeling results and observation data shows that all cases results are in good agreement with trends of observed radionuclides surface concentration; however,the modeling surface concentration is smaller than observation,especially in DDM and PHY.Furthermore,the EDM results show that MET and TUR are of more evolutionary advantage than PHY in modeling of average and maximum concentration.Therefore,this study can serve as a reference to atmospheric dispersion and environmental emergency response(EER). | SHENG Li SONG ZhenXin HU JiangKai Lü Kai TONG Hua LI Bing QIAO QingDang | 2015 | Science China Earth Sciences2015，58，3： | 3 |
| 2 | Sulfur-deficient Co9S8/Ni3S2 nanoflakes anchored on N-doped graphene nanotubes as high-performance electrode materials for asymmetric supercapacitors显示文摘In this paper,Co9S8/Ni3S2 nanoflakes(NFs)with sulfur deficiencies were grown in-situ on N-doped graphene nanotubes(NGNTs).They were successfully prepared through electrodeposition followed by hydrogenation treatment,which is able to act as a self-supported electrode for asymmetric supercapacitors(ASCs).Combining the defect-rich active materials with highly conductive skeletons,the hybrid electrode N-GNTs@sd-Co9S8/Ni3S2NFs show ultrahigh specific capacity of^304 mA hg^-1 and prominent rate capability(capacity retention ratio of^85%even at 100 Ag^-1),and deliver a long cycling lifespan of^1.9%capacitance loss after 10000 cycles.In addition,an ASC was constructed using the as-synthesized composite electrode as the positive electrode and active carbon(AC)as the negative electrode.The fabricated device shows a high energy density of^45.1 Wh kg^-1 at^3.4 kW kg^-1 and superior cycling stability.This work substantiates a smart strategy to fabricate novel composite electrode materials for next-generation supercapacitors by incorporating riched deficiencies into nanostructures. | ZHAO Jian SONG GuanYing YUAN XiangCheng SHEN Tong JIANG QingYan MENG ALan LIN YuSheng LI ZhenJiang LI QingDang | 2020 | Science China(Technological Sciences)2020，63，4： | 2 |
| 3 | Bimetal nickel-cobalt phosphide directly grown on commercial graphite substrate by the one-step electrodeposition as efficient electrocatalytic electrode显示文摘It is challenging to find a method to obtain a catalyst with low cost and efficient multifunctional performances.Herein,in order to obtain the electrode with high-performance water splitting and non-enzymatic glucose de-tection,the commercial graphite sheet(GS)with excellent durability and electroconductivity was used as substrate material,and the non-noble ternary component Ni-Co-P catalyst with hierarchical architecture was fabricated on GS via a co-electrodeposition.The catalyst only required low overpotentials of 44.6,76.5 and 49 mV to drive the current density of 10 mA cm^-2 alongside with the smaller Tafel slopes of 39.2,44.8 and 112 mV dec-1 for hydrogen evolution reaction(HER)in 1.0 M KOH,0.5 M H2SO4 and 1.0 M PBS solution,respectively.For oxygen evolution reaction(OER),the catalyst demonstrated a low overpotential of 304 mV to achieve the current density of 20 mA cm^-2 with excellent Tafel slope of 89.8 mV dec-1 in alkaline solution.Furthermore,the Ni-Co-P/GS electrode serving as non enzymatic glucose sensor exhibited the superior elec-trocatalytic activity with an ultrahigh sensitivity of 7400μA mM^-1 cm^-2,low detection limit of 0.425μM(S/N=3),and wide linear range(1-1200μM). | Alan Meng Haiqin Zhang Baihe Huangfu Wenli Tian Liying Sheng Zhenjiang Li Shuqin Tan Qingdang Li | 2020 | Progress in Natural Science:Materials International2020，30，4： | 1 |
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