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| 1 | Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion显示文摘Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide(KOH)to decrease digestion time and enhance biomethane production and fertility value.KOH concentrations of1%(K1),3%(K2),6%(K3)and 9%(K4)were tested for wheat straw pretreatment at ambient temperature with a C:N ratio of 25:1.86% of total solids(TS),89% of volatile solids(VS)and 22% of lignocellulose,cellulose and hemicellulose(LCH)(22%)were decomposed effectively with the wheat straw pretreated by 6% KOH.Enhanced biogas production and cumulative biomethane yield of 258 ml·(g VS)^(-1)were obtained increased by 45% and 41%respectively,compared with untreated wheat straw.Pretreated wheat straw digestion also yielded a digestate with higher fertilizer values potassium(138%),calcium(22%)and magnesium(16%).These results show that TS,VS and LCH can be effectively removed from wheat straw pretreated with KOH,improving biodegradability biomethane production and fertilizer value. | Muhammad Jaffar Yunzhi Pang Hairong Yuan Dexun Zou Yanping Liu Baoning Zhu Rashid Mustafa Korai Xiujin Li | 2016 | Chinese Journal of Chemical Engineering2016，24，3： | 11 |
| 2 | Receptivity to free-stream disturbance waves for hypersonic flow over a blunt cone显示文摘A high-order shock-fitting finite difference scheme is studied and used to do direc-tion numerical simulation (DNS) of hypersonic unsteady flow over a blunt cone with fast acoustic waves in the free stream, and the receptivity problem in the blunt cone hypersonic boundary layers is studied. The results show that the acoustic waves are the strongest disturbance in the blunt cone hypersonic boundary layers. The wave modes of disturbance in the blunt cone boundary layers are first, second, and third modes which are generated and propagated downstream along the wall. The results also show that as the frequency decreases, the amplitudes of wave modes of disturbance increase, but there is a critical value. When frequency is over the critial value, the amplitudes decrease. Because of the discontinuity of curvature along the blunt cone body, the maximum amplitudes as a function of frequencies are not monotone. | ZHANG YuDong FU DeXun MA YanWen LI XinLiang | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，11： | 8 |
| 3 | Numerical investigation of Richtmyer-Meshkov instability driven by cylindrical shocks显示文摘在这篇论文,有高顺序精确性和高分辨率的一个数字方法被开发模仿 Richtmyer-Meshkov (RM ) 圆柱的冲击波驾驶的不稳定性。在圆柱的坐标的可压缩的 Euler 方程为圆柱的几何学和精确的组控制计划被采用到 discretize 的第三份订单被采用方程。而且,一种适应格子技术被开发在动人的接口附近精制格子改进数字解决方案的分辨率。模拟的结果展出了 RM 不稳定性的进化过程,并且 Atwood 数字的效果被学习。越大 Atwood 数字的绝对值,越 larger 不安振幅。非线性的效果在圆柱的几何学显然表明更多。从杆中心反映的吃惊加速接口为第二次,更加复杂化物件典当和第二等的吃惊的接口进化过程,和如此的现象被学习。 | Baolin Tian Dexun Fu Yanwen Ma | 2006 | Acta Mechanica Sinica2006，22，1： | 7 |
| 4 | A 5th order monotonicity-preserving upwind compact difference scheme显示文摘Based on an upwind compact difference scheme and the idea of monotonicity-preserving, a 5th order monotonicity-preserving upwind compact difference scheme (m-UCD5) is proposed. The new difference scheme not only retains the advantage of good resolution of high wave number but also avoids the Gibbs phenomenon of the original upwind compact difference scheme. Compared with the classical 5th order WENO difference scheme, the new difference scheme is simpler and small in diffusion and computation load. By employing the component-wise and characteristic-wise methods, two forms of the new difference scheme are proposed to solve the N-S/Euler equation. Through the Sod problem, the Shu-Osher problem and the two-dimensional Double Mach Reflection problem, numerical solutions have demonstrated this new scheme does have a good resolution of high wave number and a robust ability of capturing shock waves, leading to a conclusion that the new difference scheme may be used to simulate complex flows containing shock waves. | HE ZhiWei LI XinLiang FU DeXun MA YanWen | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，3： | 6 |
| 5 | A Pilot Study of Quantitative Loop-mediated Isothermal Amplification-guided Target Therapies for Hospital-acquired Pneumonia显示文摘 | Fang Wang Ran Li Ying Shang Can Wang Guo-Qing Wang DeXun Zhou Dong-Hong Yang Wen Xi Ke-QiangWang Jing Bao Yu Kang Zhan-Cheng Gao | 2016 | Chinese Medical Journal2016，，2： | 5 |
| 6 | DNS of compressible turbulent boundary layer around a sharp cone显示文摘Direct numerical simulation of the turbulent boundary layer over a sharp cone with 20° cone angle (or 10° half-cone angle) is performed by using the mixed seventh- order up-wind biased finite difference scheme and sixth-order central difference scheme. The free stream Mach number is 0.7 and free stream unit Reynolds number is 250000/inch. The characteristics of transition and turbulence of the sharp cone boundary layer are compared with those of the flat plate boundary layer. Statistics of fully developed turbulent flow agree well with the experimental and theoretical data for the turbulent flat-plate boundary layer flow. The near wall streak-like structure is shown and the average space between streaks (normalized by the local wall unit) keeps approximately invariable at different streamwise locations. The turbulent energy equation in the cylindrical coordinate is given and turbulent en-ergy budget is studied. The computed results show that the effect of circumferen-tial curvature on turbulence characteristics is not obvious. | LI XinLiang FU DeXun MA YanWen | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，6： | 5 |
| 7 | DNS of compressible turbulent boundary layer over a blunt wedge显示文摘Direct numerical simulation of spatially evolving compressible boundary layer over a blunt wedge is performed in this paper. The free-stream Mach number is 6 and the disturbance source produced by wall blowing and suction is located downstream of the sound-speed point. Statistics are studied and compared with the results in incompressible flat-plate boundary layer. The mean pressure gradient effects on the vortex structure are studied. | LI Xinliang FU Dexun MA Yanwan | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，2： | 3 |
| 8 | 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 |
| 9 | 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 |
| 10 | Optimization of the MUSCL scheme by dispersion and dissipation显示文摘A second-order optimized monotonicity-preserving MUSCL scheme(OMUSCL2) is developed based on the dispersion and dissipation optimization and monotonicity-preserving technique.The new scheme(OMUSCL2) is simple in expression and is easy for use in CFD codes.Compared with the original second-order or third-order MUSCL scheme,the new scheme shows nearly the same CPU cost and higher resolution to shockwaves and small-scale waves.This new scheme has been tested through a set of one-dimensional and two-dimensional tests,including the Shu-Osher problem,the Sod problem,the Lax problem,the two-dimensional double Mach reflection and the RAE2822 transonic airfoil test.All numerical tests show that,compared with the original MUSCL schemes,the new scheme causes fewer dispersion and dissipation errors and produces higher resolution. | LENG Yan LI XinLiang FU DeXun MA YanWen | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，5： | 2 |
| 11 | A Method for Mass-rearing Aphidius gifuensis(Hymenoptera: Aphidiidae)显示文摘[Objective] This study presents a method for mass rearing of Aphidius gifuensis, a dominant endoparasitoid of Myzus persicae on tobacco in Southwest China. [Method] The tobacco cultivar Honghuadajinyuan(Nicotiana tabacum) was used as the host plant and M. persicae was the host insect. In a greenhouse, tobacco seedlings were reared in plastic trays. The seedlings at three-true-leaf stage were inoculated with two to three aphids per plant using aphid source with a parasitism rate of 47% ±3.9%. [Result] By this inoculation method, the aphids and parasites were simultaneously inoculated on host plants. After approximately 25 d of rearing, we were able to produce 82.5±5.17 aphid mummies per tobacco seedling. A total of 445 500 aphid mummies were produced in one greenhouse(36 rearing trays per greenhouse) during an approximately 50-day rearing period. The emergence rate was 93.4% ±2.76%, and 54% of the mummies were females. [Conclusion] The demonstrated technological feasibility of using tobacco seedlings for the mass rearing of A. gifuensis increases the potential for the biological control of M. persicae. | Xinzhong WANG Jian ZHU Junwei SUN Yanxia HU Dexun WANG | 2014 | Agricultural Science & Technology2014，15，3： | 2 |
| 12 | Complex Transition of Double-Diffusive Convection in a Rectangular Enclosure with Height-to-Length Ratio Equal to 4: Part I显示文摘This is the first part of direct numerical simulation(DNS)of double-diffusive convection in a slim rectangular enclosure with horizontal temperature and concentration gradients.We consider the case with the thermal Rayleigh number of 105,the Pradtle number of 1,the Lewis number of 2,the buoyancy ratio of composition to temperature being in the range of[0,1],and height-to-width aspect ration of 4.A new 7thorder upwind compact scheme was developed for approximation of convective terms,and a three-stage third-order Runge-Kutta method was employed for time advancement.Our DNS suggests that with the buoyancy ratio increasing form 0 to 1,the flow of transition is a complex series changing from the steady to periodic,chaotic,periodic,quasi-periodic,and finally back to periodic.There are two types of periodic flow,one is simple periodic flow with single fundamental frequency(FF),and another is complex periodic flow with multiple FFs.This process is illustrated by using time-velocity histories,Fourier frequency spectrum analysis and the phase-space trajectories. | Xian Liang Xinliang Li Dexun Fu Yanwen Ma | 2009 | Communications in Computational Physics2009，6，7： | 2 |
| 13 | Screening antagonistic microbes for seedling blight of rice and study on antagonistic mechanisms显示文摘It is shown by the result of the dual-cultured experiment that the inhibitory rate of DZW-47 was 60.42%,and the inhibitory rates of R.solani by actinomyces ZLR-2 and ZLR-11 were 43.75% and 43.05%,lower than that of DZW-47.The inhibitory mycelia growth mechanism of different strains on R.solani was quite different,with DZW-3 mainly on the aspect of hyperparasitism, DZW-21 on the synergism of hyperparasitism and metabolite,DZW-47 on the synergism of nutrient competition and secondary metabolite,ZLR-2 and ZLR- 11 on producing secondary metabolite.Controlling efficiency of seedling bed accorded basically with that of the broth.The controlling efficiency of DZW-47,ZLR-2,ZLR-11,DZW-21 and DZW-3 were 97.20%,95.7%,94.6%,93.6% and 89.20%,respectively. | REN Li XU Fenghua ZOU Dexun LI Haihui | 2007 | Journal of Northeast Agricultural University(English Edition)2007，14，2： | 1 |
| 14 | Bioremediation of polycyclic aromatic hydrocarbons contaminated soil with Monilinia sp.: degradation and microbial community analysis显示文摘 | Yucheng Wu Yongming Luo Dexun Zou Jinzhi Ni Wuxin Liu Ying Teng Zhengao Li | 2008 | Biodegradation2008，，2： | 1 |
| 15 | Evolution of three-dimensional coherent structures in compressible axisymmetric jet显示文摘 | Mingyu Liu Yanwen Ma Dexun Fu | 2003 | Science in China Series G: Physics Mechanics and Astronomy2003，，4： | 1 |
| 16 | Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack显示文摘 | Li Xinliang Fu Dexun Ma Yanwen | 2010 | Physics of Fluids2010，22，： | 1 |
| 17 | Numerical simulation of Richtmyer-Meshkov instability显示文摘The compressible Navier-Stokes equations discretized with a fourth order accurate compact finite difference scheme with group velocity control are used to simulate the Richtmyer-Meshkov (R-M) instability problem produced by cylindrical shock-cylindrical material interface with shock Mach number Ms=1.2 and density ratio 1:20 (interior density/outer density). Effect of shock refraction, reflection, interaction of the reflected shock with the material interface, and effect of initial perturbation modes on R-M instability are investigated numerically. It is noted that the shock refraction is a main physical mechanism of the initial phase changing of the material surface. The multiple interactions of the reflected shock from the origin with the interface and the R-M instability near the material interface are the reason for formation of the spike-bubble structures. Different viscosities lead to different spike-bubble structure characteristics. The vortex pairing phenomenon is found in the initial double mode simulation. The mode interaction is the main factor of small structures production near the interface. | FU Dexun, MA Yanwen, ZHANG Linbo & TIAN BaolinState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China State Key Laboratory of Scientific and Engineering Computing, Institute of Computational Mathematics, Chinese Academy of Sciences, Beijing 100080, China | 2004 | Science China Mathematics2004，47，z1： | 1 |
| 18 | Direct numerical simulation of compressible isotropic turbulence显示文摘 | Li Xinliang Fu Dexun Ma Yanwen | 2002 | Science in China Series A: Mathematics2002，，11： | 1 |
| 19 | DNS and scaling law analysis of compressible turbulent channel flow显示文摘 | Xinliang Li Yanwen Ma Dexun Fu | 2001 | Science in China Series A: Mathematics2001，，5： | 1 |
| 20 | Research on mechanism of flow excursion in nar- row rectangle channel under natural circulation 显示文摘 | ZHOU Tao HONG Dexun RAN Ke | 2013 | Nuclear Engineering and Design2013，254，： | 1 |
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