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| 1 | Optimization of endwall contouring in axial compressor S-shaped ducts显示文摘This paper presents a numerical investigation of the potential aerodynamic benefits of using endwall contouring in a fairly aggressive duct with six struts based on the platform for endwall design optimization.The platform is constructed by integrating adaptive genetic algorithm(AGA), design of experiments(DOE), response surface methodology(RSM) based on the artificial neural network(ANN), and a 3D Navier–Stokes solver.The visual analysis method based on DOE is used to define the design space and analyze the impact of the design parameters on the target function(response).Optimization of the axisymmetric and the non-axisymmetric endwall contouring in an S-shaped duct is performed and evaluated to minimize the total pressure loss.The optimal ducts are found to reduce the hub corner separation and suppress the migration of the low momentum fluid.The non-axisymmetric endwall contouring is shown to remove the separation completely and reduce the net duct loss by 32.7%. | Jin Donghai Liu Xiwu Zhao Weiguang Gui Xingmin | 2015 | Chinese Journal of Aeronautics2015，28，4： | 7 |
| 2 | Changes in sediment discharge in a sediment-rich region of the Yellow River from 1955 to 2010: implications for further soil erosion control显示文摘The well-documented decrease in the discharge of sediment into the Yellow River has attracted considerable attention in recent years. The present study analyzed the spatial and temporal variation of sediment yield based on data from 46 hydrological stations in the sediment-rich region of the Yellow River from 1955 to 2010. The results showed that since 1970 sediment yield in the region has clearly decreased at different rates in the 45 sub-areas controlled by hydrological stations. The decrease in sediment yield was closely related to the intensity and extent of soil erosion control measures and rainstorms that occurred in different periods and sub-areas. The average sediment delivery modulus(SDM) in the study area decreased from 7,767.4 t/(km2?a) in 1951–1969 to 980.5 t/(km2?a) in 2000–2010. Our study suggested that 65.5% of the study area with the SDM below 1,000 t/(km2?a) is still necessary to control soil deterioration caused by erosion, and soil erosion control measures should be further strengthened in the areas with the SDM above 1,000 t/(km2?a). | JuYing JIAO ZhiJie WANG GuangJu ZHAO WanZhong WANG XingMin MU | 2014 | Journal of Arid Land2014，6，5： | 7 |
| 3 | Effects of Catalyst and Additive Containing Li, Na, or Ca on Reduction of Iron Oxide/Carbon Composite Pellets显示文摘The catalyst containing 0.69% (mass fraction) of Li, Na+, or Ca2+ were synthesized, and the catalytic effect on the reduction of iron oxide/carbon composite pellets were investigated by comparing with that of additive at 850 ℃. The effect of the catalyst was greater than that of the additive, it can be considered that catalyst promoted the formation of iron nucleus early on reduction processes of iron oxide/carbon composite pellets. In addition, both effects of catalyst and additive increased after added carbon powder into the pellets, but the extent of increase decreased when the carbon powder exceeded a suitable content (about 4%), this amount is less than that of car-bon needed theoretically on the reduction from hematite to iron. | Xingmin Guo, Shengbi Zhang, Nianxin Fu, Xiaofeng Zhao Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China Northeastern University, Shenyang 110006, China Anshan Iron and Steel (Group) Company, Anshan 114021, China | 2001 | Journal of University of Science and Technology Beijing2001，8，3： | 6 |
| 4 | Numerical Investigation of Base-Setting of Stator's Stagger Angles for a 15-stage Axial-Flow Compressor显示文摘A 15-stage axial-flow compressor utilized in steel industry was studied in this paper. All the stator's stagger angles of the compressor are variable to ensure the multistage compressor operate effectively within a wide range of flow rate and meanwhile satisfy the demand for sufficient pressure ratio, adiabatic efficiency and stall margin. Three in all different base-settings of stator's stagger angles were presented and commercial CFD software was applied to obtain the overall performance characteristics. The results showed that both of the optimized base-settings improved the performances both in summer and winter conditions, although the adiabatic efficiency was somewhat decreased. Taking incidence angle and stage loading into consideration, differences among the three cases were analyzed in detail. On the basis of numerical computations, the performance could be effectively improved through adjusting the base-setting of stator's stagger angles. | CHANG Hao ZHAO Weiguang JIN Donghai PENG Zeyan GUI Xingmin | 2014 | Journal of Thermal Science2014，23，1： | 3 |
| 5 | Spatial-temporal Analysis and Prediction of Precipitation Extremes: A Case Study in the Weihe River Basin, China显示文摘Extreme precipitation events bring considerable risks to the natural ecosystem and human life.Investigating the spatial-temporal characteristics of extreme precipitation and predicting it quantitatively are critical for the flood prevention and water resources planning and management.In this study,daily precipitation data(1957–2019)were collected from 24 meteorological stations in the Weihe River Basin(WRB),Northwest China and its surrounding areas.We first analyzed the spatial-temporal change of precipitation extremes in the WRB based on space-time cube(STC),and then predicted precipitation extremes using long short-term memory(LSTM)network,auto-regressive integrated moving average(ARIMA),and hybrid ensemble empirical mode decomposition(EEMD)-LSTM-ARIMA models.The precipitation extremes increased as the spatial variation from northwest to southeast of the WRB.There were two clusters for each extreme precipitation index,which were distributed in the northwestern and southeastern or northern and southern of the WRB.The precipitation extremes in the WRB present a strong clustering pattern.Spatially,the pattern of only high-high cluster and only low-low cluster were primarily located in lower reaches and upper reaches of the WRB,respectively.Hot spots(25.00%–50.00%)were more than cold spots(4.17%–25.00%)in the WRB.Cold spots were mainly concentrated in the northwestern part,while hot spots were mostly located in the eastern and southern parts.For different extreme precipitation indices,the performances of the different models were different.The accuracy ranking was EEMD-LSTM-ARIMA>LSTM>ARIMA in predicting simple daily intensity index(SDII)and consecutive wet days(CWD),while the accuracy ranking was LSTM>EEMD-LSTM-ARIMA>ARIMA in predicting very wet days(R95 P).The hybrid EEMD-LSTM-ARIMA model proposed was generally superior to single models in the prediction of precipitation extremes. | QIU Dexun WU Changxue MU Xingmin ZHAO Guangju GAO Peng | 2022 | Chinese Geographical Science2022，32，2： | 3 |
| 6 | Application of the InVEST model for assessing water yield and its response to precipitation and land use in the Weihe River Basin, China显示文摘With realizing the importance of ecosystem services to society, the efforts to evaluate the ecosystem services have increased. As the largest tributary of the Yellow River, the Weihe River has been endowed with many ecological service functions. Among which, water yield can be a measure of local availability of water and an index for evaluating the conservation function of the region. This study aimed to explore the temporal and spatial variation of water yield and its influencing factors in the Weihe River Basin(WRB), and provide basis for formulating reasonable water resources utilization schemes. Based on the InVEST(integrated valuation of ecosystem services and tradeoffs) model, this study simulated the water yield in the WRB from 1985 to 2019, and discussed the impacts of climatic factors and land use change on water yield by spatial autocorrelation analysis and scenario analysis methods. The results showed that there was a slight increasing trend in water yield in the WRB over the study period with the increasing rate of 4.84 mm/10a and an average depth of 83.14 mm. The main water-producing areas were concentrated along the mainstream of the Weihe River and in the southern basin. Changes in water yield were comprehensively affected by climate and underlying surface factors. Precipitation was the main factor affecting water yield, which was consistent with water yield in time. And there existed significant spatial agglomeration between water yield and precipitation. Land use had little impact on the amount of water yield, but had an impact on its spatial distribution. Water yield was higher in areas with wide distribution of construction land and grassland. Water yield of different land use types were different. Unused land showed the largest water yield capacity, whereas grassland and farmland contributed most to the total water yield. The increasing water yield in the basin indicates an enhanced water supply service function of the ecosystem. These results are of great significance to the water resources management of the WRB. | WU Changxue QIU Dexun GAO Peng MU Xingmin ZHAO Guangju | 2022 | Journal of Arid Land2022，14，4： | 2 |
| 7 | Investigation of the transport and fate of Pb, Cd, Cr(VI) and As(V) in soil zones derived from moderately contaminated farmland in Northeast, China显示文摘 | Xingmin Zhao Deming Dong Xiuyi Hua Shuofei Dong | 2009 | Journal of Hazardous Materials2009，，： | 1 |
| 8 | Gas hydrate formation and its accumulation potential in Mohe permafrost, China显示文摘 | Xingmin Zhao Jian Deng Jinping Li Cheng Lu Jian Song | 2012 | Marine and Petroleum Geology2012，，1： | 1 |
| 9 | Quan- tifying the Impact of Climate Variability and Human Activities on Streamflow in the Middle Reaches of the Yellow River Basin, China 显示文摘 | Zhao Guangju Tian Peng Mu Xingmin | 2014 | Journal of Hydrology2014，519，： | 1 |
| 10 | Ecological basis of alpine mead-ow ecosystem management in Tibet:Haibei alpine meadow e-cosystem research station显示文摘 | Zhao Xinquan Zhou Xingmin | 1999 | A Journal of the Human Envi-ronment1999，28，8： | 1 |
| 11 | Polydatin – a new mitochondria protector for acute severe hemorrhagic shock treatment显示文摘 | Xingmin Wang Rui Song Yunyan Chen Ming Zhao Ke-seng Zhao | 2013 | Expert Opinion on Investigational Drugs2013，，2： | 1 |
| 12 | Investigation of the transport and fate of Pb, Cd, Cr( IV ) and As( V ) in soil zones derived from moderately contaminated farmland in Northeast,China 显示文摘 | ZHAO Xingmin DONG Deming HUA Xiuyi | 2009 | Journal of Hazardous Materials2009，170，23： | 1 |
| 13 | Decoupling effects of driving factors on sediment yield in the Chinese Loess Plateau显示文摘Investigations of runoff and sediment yield changes and their relationships with potential driving factors provide good insights for understanding the mechanisms of hydrological processes.This study attempted to present a comprehensive investigation on the spatiotemporal variations of sediment yield in the Loess Plateau using continuous observed data at 46 hydrological stations during 1961-2016,and its responses to changes of precipitation,land use/cover and vegetation cover were analyzed by using the Partial Least Squares-Structural Equation Model(PLS-SEM).The results indicated that sediment yield reduced pro-nouncedly during 1961-2016 in the Loess Plateau,and 77.9%of this variation was explained by the combined effects of precipitation,land-use change,vegetation dynamics and runoff reduction.Indirect effects of precipitation,land-use change,and vegetation cover on sediment yield were 0.242,-0.528 and-0.630(P<0.05),respectively,and direct effect of runoff on sediment yield was 0.833(P<0.05).According to the Pearson Correlation Coefficient,the strongest positive correlation existed between annual sediment yield and runoff(r=0.88,P<0.05),followed by vegetation cover(r=-0.47,P<0.05)and land-use change(i.e.forest land and grassland)suggesting their significant trapping effects on soil erosion.However,lower correlations were examined between sediment yield and precipitation indices(-0.14 | Xiaojing Tian Guangju Zhao Xingmin Mu Pengfei Zhang Peng Gao Wenyi Sun Xiaoyan Lu Peng Tian | 2023 | International Soil and Water Conservation Research2023，11，1： | 1 |
| 14 | Soil erosion, conservation and eco environmental changes in the Loess Plateau of China显示文摘 | Zhao Guangju Mu Xingmin Wen Zhongming et aI | 2013 | Land Degradation & De velopment2013，24，5： | 1 |
| 15 | Dynamic Changes of Sediment Load in the Middle Reaches of the Yellow River Basin,China and Implications for Eco-Restoration显示文摘 | Yue Xiaoli Mu Xingmin Zhao Guangju | 2014 | Ecological Engineering2014，73，： | 1 |
| 16 | Investigation of the transport and fate of Pb, Cd, Cr(VI) and As(V) in soil zones derived from moderately contaminated farmland in Northeast, China显示文摘 | ZHAO Xingmin DONG Deming HUA Xiuyi | 2009 | J Hazardous Materials2009，170，23： | 1 |
| 17 | Modified group contribution method for predicting the entropy of vaporization at normal boiling point显示文摘 | MA Peisheng ZHAO Xingmin | 1993 | Ind Eng Chem Fundam1993，32，12： | 1 |
| 18 | Modified Group Contribution Method for Predicting the Entropy of Vaporization at the Normal Boiling Point 显示文摘 | PEISHENG MA XINGMIN ZHAO | 1993 | Ind Eng Chem Res1993，32，： | 1 |
| 19 | Ecological basis of alpine meadow ecosystem management in Tibet: llaibei alpine meadow ecosystem research station显示文摘 | Zhao Xinquan Zhou Xingmin | 1999 | Ambio1999，28，： | 1 |
| 20 | Gully erosion and expansion mechanisms in loess tablelands and the scientific basis of gully consolidation and tableland protection显示文摘Gully erosion is serious in the tableland area of the Loess Plateau due to high-intensity human activities and extreme rainfall, which cause serious soil loss and an increasing tableland shrinkage rate. Severe gully erosion has exerted a notable negative impact on local agriculture, human life and socioeconomic development. In recent decades, progress has been made in soil and water conservation with the goal of reducing soil erosion and protecting loess tableland, but basic research on gully consolidation and tableland protection(GCTP) is lacking, especially regarding the mechanisms of gully erosion and expansion in loess tableland under the interactive impacts of hydrodynamics and human activities. In addition, there is a lack of a deep understanding of the underlying mechanisms of soil-water disasters and controlling factors of unreasonable GCTP projects.Currently, the problems of headcut erosion and tableland fragmentation remain serious. Based on this situation, the Dongzhi tableland, the largest tableland on the Loess Plateau, was adopted as an example, and we studied gully erosion and expansion mechanisms in the loess tableland and the scientific basis of GCTP projects. We obtained a series of novel findings, including the following:(1) vertical joints are widely developed in loess and impose a controlling effect on tableland edge erosion;(2) rapid urbanization and road network expansion intensify headcut erosion and are the main reasons for severe erosion and tableland shrinkage in the Dongzhi tableland;and(3) unreasonable drainage of surface runoff and a rise in the groundwater level are the key factors affecting GCTP project stability. Moreover, the mechanisms and modes of erosion disasters in the project driven by these two factors were explained. The systematic remediation idea of retention, storage, drainage and consolidation for the GCTP project was introduced, and the core is water control, which emphasizes the combination of soil and water conservation and geohazard prevention measures. As a systematic remediation project, GCTP in loess tableland requires multidisciplinary and multimethod approaches and multiple measures involving ecology, soil and water conservation, geology and engineering to ensure project feasibility and sustainability. | Zhao JIN Jianbing PENG Jianqi ZHUANG Li FENG Aidi HUO Xingmin MU Wenlong WANG | 2023 | Science China Earth Sciences2023，66，4： | 1 |
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