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Journal of Materials Science & Technology 2024年第3期170卷 200-211页

作者： Yanyan Zhao Xu Fan hongxing zheng Enzhou Liu Jun Fan Xuejun Wang College of Biology Pharmacy and Food Engineering Shangluo UniversityShangluo 726000China QinLing-Bashan Mountains Bioresources Comprehensive Development C.I.C. Shaanxi University of TechnologyHanzhong 723001China School of Chemical Engineering Northwest UniversityXi’an 710069China

Constructing of heterojunction was identified as a feasible way to improve photocatalytic activity of *** this work,a n-p type Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was successfully prepared for organic pollutants *** Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction exhibited much higher pho-tocatalytic activity towards Rhodamine B(92.24%,expose to visible light for 60 min),norfloxacin(81.73%,expose to visible light for 90 min)and levofloxacin(87.46%,expose to visible light for 90 min)than pure Bi_(2)WO_(6)and pure AgInS_(2).Toxicity analysis indicated the low environmental toxicity of Rhodamine B degradation intermediates for Rye seeds and Sudangrass seeds germination and *** study displayed that AgInS_(2)and Bi_(2)WO_(6)work as the primary photocatalyst to form·O_(2)−and ·OH,*** improved photocatalytic activity of the Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was due to the im-proved light response range and intensified carrier separation ***,a S-scheme charge transfer mechanism including multiple charge transfer channels was *** work could provide an effective strategy for organic pollutants degradation in wastewater.

关键词： Photocatalysis S-scheme heterojunction AgInS_(2) Bi_(2)WO_(6) Toxicity experiments

Development of Hydro-Informatic Modelling System and its application

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Science China(Technological Sciences) 2008年第4期51卷 456-466页

作者： LIU ChangMing WANG ZhongGen zheng hongxing ZHANG Lu WU XianFeng Key Laboratory of Water Resources and Related Land Surface Processes Institute of Geographical Sciences and Natural ResourcesChinese Academy of SciencesBeijing 100101China College of Water Sciences Beijing Normal UniversityBeijing 100875China CSIRO Land and Water Christian LaboratoryGPO Box 1666CanberraA.C.T.2601Australia Environmental Protection Administration Beijing 100101China

The understanding of hydrological cycle is the core of hydrology and the scientific base of water resources management. Meanwhile, simulation of hydrological cycle has long been regarded as an important tool for the assessment, utilization and protection of water resources. In this paper, a new tool named Hydro-Informatic Modelling System (HIMS) has been developed and introduced with case studies in the Yellow River Basin in China and 331 catchments in Australia. The case studies showed that HIMS can be employed as an integrated platform for hydrological simulation in different regions. HIMS is a modular based framework of hydrological model designed for different utilization such as flood forecasting, water resources planning and evaluating hydrological impacts of climate change and human activities. The unique of HIMS is its flexibility in providing alternative modules in the simulation of hydrological cycle, which successfully overcome the difficulties in the availability of input data, the uncertainty of parameters, and the difference of rainfall-runoff processes. The modular based structure of HIMS makes it possible for developing new hydrological models by the users.

关键词： HIMS model customization hydrological cycle water resources

Responses of River Runoff to Climate Change Based on Nonlinear Mixed Regression Model in Chaohe River Basin of Hebei Province, China

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Chinese Geographical Science 2010年第2期20卷 152-158页

作者： JIANG Yan LIU Changming zheng hongxing LI Xuyong WU Xianing State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Water Sciences Beijing Normal University Beijing 100875 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Sinohydro Corporation Limited Beijing 100044 China

Taking the nonlinear nature of runoff system into account,and combining auto-regression method and multi-regression method,a Nonlinear Mixed Regression Model (NMR) was established to analyze the impact of temperature and precipitation changes on annual river runoff process. The model was calibrated and verified by using BP neural network with observed meteorological and runoff data from Daiying Hydrological Station in the Chaohe River of Hebei Province in 1956–2000. Compared with auto-regression model,linear multi-regression model and linear mixed regression model,NMR can improve forecasting precision remarkably. Therefore,the simulation of climate change scenarios was carried out by NMR. The results show that the nonlinear mixed regression model can simulate annual river runoff well.

关键词： river runoff runoff forecast nonlinear mixed regression model linear multi-regression model linear mixed regression model BP neural network

Niobium alloying effect in high carbon equivalent grey cast iron

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China Foundry 2011年第1期8卷 36-40页

作者： Zhou Wenbin Zhu Hongbo zheng Dengke zheng hongxing Hua Qin Zhai Qijie Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China Shanghai Huizhong Automotive Manufacturing Co. Ltd. Shanghai 200072 China Instrumental Analysis ＆ Research Center Shanghai University Shanghai 200072 China

The effect of niobium on the formation of NbC phase and solidification structure in high carbon equivalent grey cast iron was *** experimental results indicated that an increase in the niobium content is favorable to refining the graphite and eutectic cell;and the pearlite lamellar spacing is *** on the thermodynamic calculation the formation of NbC is prior to the eutectic *** reduction in the pearlite lamellar spacing is mainly attributed to the decrease of eutectic temperature with the addition of ***,properties including hardness and wear resistance were improved after the addition of niobium.

关键词： niobium alloying grey cast iron high carbon equivalent refinement

Evolution of melt convection in a liquid metal driven by a pulsed electric current

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Chinese Physics B 2021年第8期30卷 424-432页

作者： Yanyi Xu Yunhu Zhang Tianqing zheng Yongyong Gong Changjiang Song hongxing zheng Qijie Zhai Center for Advanced Solidification Technology Shanghai UniversityShanghai 200072China College of Science Shanghai UniversityShanghai 200444China

Gain refinement in metal alloy can be achieved by applying an electric current pulse(ECP)in solidification *** flow inside the melt has been proved to be a key role in grain *** this paper,the fluid flow inside Ga 20 wt%-In 12 wt%-Sn alloy induced by a damping sinusoidal ECP flowing through two parallel electrodes into the cylindrical melt was investigated by both experimental measurements and numerical *** results showed that a strong descending jet was induced beneath the bottom of electrodes under the application of ***,it was found that flow intensity increases with the increase of amplitude,frequency,and pulse width,*** order to unlock the formation mechanism of flow pattern and the relevance of flow intensity varied with electrical parameters,a three-dimensional numerical model under the application of ECP was ***,a comparative study was conducted by numerical simulations to reveal the distributions of electromagnetic fields and forced *** results showed that the downward Lorentz force induced by ECP was concentrated beneath the bottom of *** downward Lorentz force induces a descending jet and provokes a global forced *** to numerical simulations,the evolution of flow intensity with electrical parameters under the application of ECP can be understood by the time averaged impulse of Lorentz force.

关键词： pulsed electric current flow measurement numerical simulation magnetohydrodynamics

High-temperature phase transition behavior and magnetocaloric effect in a sub-rapidly solidified La–Fe–Si plate produced by centrifugal casting

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Journal of Materials Science & Technology 2018年第8期34卷 1337-1343页

作者： Zhishuai Xu Yuting Dai Yue Fang Zhiping Luo Ke Han Changjiang Song Qijie Zhai hongxing zheng Laboratory for Microstructures Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Spedal Steel Shanghai UniversityShanghai 200444China Department of Chemistry and Physics FayetteviUe State UniversityFayettevilleNC28301USA National High Magnetic Field Laboratory Florida State UniversityTaUahasseeFL 32310USA

A sub-rapidly solidified LaFe11.6Si1.4 plate was fabricated directly from liquid by centrifugal casting method. The phase constitution, microstructure and magnetocaloric effect were investigated using backscatter scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and phys- ical property measurement system. When the plate was annealed at 1373 K, rl phase was formed by a solid-state peritectoid reaction. A first-order magnetic phase transition occurred in the vicinity of 188 K, and the effective refrigeration capacities reached 203.5J/kg and 209.7J/kg in plates annealed for I h and 3 h, respectively, under a magnetic field change of 3T. It is suggested that centrifugal casting may become a new approach to prepare high-performance La-Fe-Si magnetocaloric plates for prac- tical applications, which could largely accelerate the formation of rl phase during high-temperature heat-treatment process due to refined and homogeneous honeycombed microstructure.

关键词： La-Fe-Si Magnetocaloric effect Rapid solidification Centrifugal casting Phase transition

Visible-to-near-infrared photodetectors based on SnS/SnSe_(2)and SnSe/SnSe_(2)p−n heterostructures with a fast response speed and high normalized detectivity

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Journal of Semiconductors 2024年第3期45卷 76-83页

作者： Xinfa Zhu Weishuai Duan Xiancheng Meng Xiyu Jia Yonghui Zhang Pengyu Zhou Mengjun Wang hongxing zheng Chao Fan School of Electronic and Information Engineering Hebei University of TechnologyTianjin 300401China School of Science Northeast Electric Power UniversityJilin 132012China

The emergent two-dimensional(2D)material,tin diselenide(SnSe_(2)),has garnered significant consideration for its potential in image capturing systems,optical communication,and optoelectronic ***,SnSe_(2)-based photodetection faces obstacles,including slow response speed and low normalized *** this work,photodetectors based on SnS/SnSe_(2)and SnSe/SnSe_(2)p−n heterostructures have been implemented through a polydimethylsiloxane(PDMS)−assisted transfer *** photodetectors demonstrate broad-spectrum photoresponse within the 405 to 850 nm wavelength *** photodetector based on the SnS/SnSe_(2)heterostructure exhibits a significant responsivity of 4.99×10^(3)A∙W^(−1),normalized detectivity of 5.80×10^(12)cm∙Hz^(1/2)∙W^(−1),and fast response time of 3.13 ms,respectively,owing to the built-in electric ***,the highest values of responsivity,normalized detectivity,and response time for the photodetector based on the SnSe/SnSe_(2)heterostructure are 5.91×10^(3)A∙W^(−1),7.03×10^(12)cm∙Hz^(1/2)∙W−1,and 4.74 ms,*** their photodetection performances transcend those of photodetectors based on individual SnSe_(2),SnS,SnSe,and other commonly used 2D *** work has demonstrated an effective strategy to improve the performance of SnSe_(2)-based photodetectors and paves the way for their future commercialization.

关键词： two-dimensional materials tin diselenide heterostructures broad-spectrum photodetectors

Effect of temperature field on solidification structure of pure Al under pulse magneto-oscillation

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China Foundry 2011年第2期8卷 172-176页

作者： Li Bo Yin Zhenxing Gong Yongyong LJ Kefeng zheng hongxing Li Renxing Zhai Qijie Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China Instrumental Analysis ＆ Research Center Shanghai University Shanghai 200444 China

This article discusses the effect of temperature field on the Pulse Magneto-Oscillation(PMO) induced solidification refinement of pure aluminium to provide more information for the industrial application of the PMO solidification *** temperature field is altered mainly by applied variable cooling conditions and pulse *** results show that the refinement effect in the case of full sand mould applied is weakened with the decreasing of cooling rate,however,in the alternative case,the sand mould whose sand bottom was replaced by a graphite block is favorable to the survival of equiaxed *** refinement mechanism is discussed in terms of the relationship between temperature field and the formation process of solidified *** formation or survival of nucleus depends on both temperature field and Joule heat produced by PMO,both low pulse frequency and high pulse current were experimentally confirmed to be effective;and PMO was demonstrated high potential in industrial application.

关键词： pulse magneto-oscillation (PMO) solidification structure grain refinement Joule heat

Estimation of groundwater residence time and recession rate in watershed of the Loess Plateau

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Journal of Geographical Sciences 2010年第2期20卷 273-282页

作者： ZHU Ruirui zheng hongxing LIU Changming Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Groundwater residence time is an important indicator of hydrological cycle and essential for water resources development and utilization. In this paper, groundwater residence time in non-flood season, flood season and water year has been determined from daily streamflow hydrograph of ten hydrological stations in Wudinghe River Basin located in the middle reaches of the Yellow River Basin. Results have showed that： baseflow recession constant in Wudinghe River Basin ranges from 0.72 to 0.94 with a larger recession rate in flood season than that in non-flood season. Spatially, the recession rate of baseflow in loess area is the biggest, but is the smallest in the sandy area. The half-residence time of groundwater varies from 1.8 to 45.5 days while overall residence time of groundwater is between 34 and 342 days in different sub-basins of the Wudinghe River Basin. The annual average overall residence time of groundwater decreases from 117 days in the upper reaches to 73 days in the lower reaches.

关键词： baseflow recession constant residence time Wudinghe River

Change of the solar radiation and its causes in the Haihe River Basin and surrounding areas

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Journal of Geographical Sciences 2010年第4期20卷 569-580页

作者： LIU Changming LIU Xiaomang zheng hongxing ZENG Yan Institute of Geographic Sciences and Natural Resources Research CASBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China College of Resources and Environment Beijing Normal UniversityBeijing 100875China Jiangsu Institute of Meteorological Sciences Nanjing 210008China

Solar radiation is an important driving force for the formation and evolution of climate system. Analysis of change in solar radiation is helpful in understanding mechanism of climate change. In this study, the temporal and spatial variations of solar radiation and the cause of the change in solar radiation have been analyzed based on meteorological data from 46 national meteorological stations and aerosol index data from TOMS over the Haihe River Basin and surrounding areas. The results have shown that solar radiation and direct radiation significantly decreased, while scattered radiation increased during the period 1957-2008. Spatially, the decreasing trend of solar radiation was more and more significant from low population density areas to high population density areas. The spatial distribution of increase in aerosol index is consistent with that of decrease in solar radiation. The increase in aerosols resulting from human activities was an important reason for the decrease in solar radiation.

关键词： solar radiation trend aerosol Haihe River Basin