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| 1 | Visualization of CO_2 and oil immiscible and miscible flow processes in porous media using NMR micro-imaging显示文摘CO_2 flooding is considered not only one of the most effective enhanced oil recovery(EOR) methods,but also an important alternative for geological CO_2 storage.In this paper,the visualization of CO_2 flooding was studied using a 400 MHz NMR micro-imaging system.For gaseous CO_2 immiscible displacement,it was found that CO_2 channeling or fingering occurred due to the difference of fluid viscosity and density.Thus,the sweep efficiency was small and the final residual oil saturation was 53.1%.For supercritical CO_2 miscible displacement,the results showed that piston-like displacement occurred,viscous fingering and the gravity override caused by the low viscosity and density of the gas was effectively restrained,and the velocity of CO_2 front was uniform.The sweep efficiency was so high that the final residual oil saturation was 33.9%,which indicated CO_2 miscible displacement could enhance oil recovery more than CO_2 immiscible displacement.In addition,the average velocity of CO_2 front was evaluated through analyzing the oil saturation prof ile.A special core analysis method has been applied to in-situ oil saturation data to directly evaluate the local Darcy phase velocities and capillary dispersion rate. | Zhao Yuechao SongYongchen Liu Yu Jiang Lanlan Zhu Ningjun | 2011 | Petroleum Science2011，8，2： | 9 |
| 2 | Flight dynamics modeling of a small ducted fan aerial vehicle based on parameter identifcation显示文摘This paper presents a simple and useful modeling method to acquire a dynamics model of an aerial vehicle containing unknown parameters using mechanism modeling,and then to design different identifcation experiments to identify the parameters based on the sources and features of its unknown parameters.Based on the mathematical model of the aerial vehicle acquired by modeling and identifcation,a design for the structural parameters of the attitude control system is carried out,and the results of the attitude control flaps are verifed by simulation experiments and flight tests of the aerial vehicle.Results of the mathematical simulation and flight tests show that the mathematical model acquired using parameter identifcation is comparatively accurate and of clear mechanics,and can be used as the reference and basis for the structural design. | Wang Zhengjie Liu Zhijun Fan Ningjun Guo Meifang | 2013 | Chinese Journal of Aeronautics2013，26，6： | 5 |
| 3 | Control and dynamics analysis for miniature autogyro and compound autogyro显示文摘Dear editor,An autogyro is a type of aircraft achieving effective low-speed flight and short take-off and landing performance.A compound autogyro is a“pure”autogyro.designed with additional fixed wings.Its rotor ensures effective low-speed flight performance,and because the wings produce most of the lift at high airspeeds many problems associated with high-speed rotor dynamics in pure autogyros(and helicopters by extension)are circumvented [1]. | Zhihao CAI Ningjun LIU Jiang ZHAO Yingxun WANG | 2019 | Science China(Information Sciences)2019，62，1： | 2 |
| 4 | Measurement of Immiscible CO2Flooding Processes and Permeability Reduction due to Asphaltene Precipitation by X-ray CT Imaging显示文摘 | Wang Tonglei Song Yongchen zhao Yuechao Liu Yu and Zhu Ningjun | 2013 | Energy Procedia2013，，： | 1 |
| 5 | Onboard actuator model-based Incremental Nonlinear Dynamic Inversion for quadrotor attitude control:Method and application显示文摘This paper addresses the robust attitude control problem for quadrotors subject to model mismatch and disturbances.A dynamic inversion based attitude control scheme is proposed,which consists of an outer loop attitude controller and an inner loop angular acceleration controller.The attitude controller is designed based on the Nonlinear Dynamic Inversion(NDI)to precisely linearize the nonlinear dynamics between the angular acceleration and the attitude.An onboard actuator model-based Incremental Nonlinear Dynamic Inversion(INDI)controller is designed in the angular acceleration control loop to improve the robustness against the model mismatch and disturbances.Meanwhile,the onboard actuator model with a modified structure eliminates the oscillation phenomenon when the sampling rate of the controller is higher than that of the actuator.Numerical simulations and flight tests demonstrate the effectiveness and robustness of the proposed controller in comparison with the PID controller. | Zexin WANG Jiang ZHAO Zhihao CAI Yingxun WANG Ningjun LIU | 2021 | Chinese Journal of Aeronautics2021，34，11： | 1 |
| 6 | Measurement of Immiscible CO 2 Flooding Processes and Permeability Reduction due to Asphaltene Precipitation by X-ray CT Imaging显示文摘 | Tonglei Wang Yongchen Song Yuechao zhao Yu Liu Ningjun Zhu | 2013 | Energy Procedia2013，，： | 1 |
| 7 | Aquafeed fermentation improves dietary nutritional quality and benefits feeding behavior,meat flavor,and intestinal microbiota of Chinese mitten crab(Eriocheir sinensis)显示文摘Normally,proper fermentation can be an efficient and widely used method to improve feed quality in animal rearing;however,the studies on crustaceans,especially Eriocheir sinensis,remain limited.This study aimed to investigate whether feed fermentation could meliorate dietary nutritional value and benefit E.sinensis rearing.First,non-fermented feed(NFD)and fermented feed(FD)were produced and assessed,respectively.Then,the“Y”maze feed choice behavior test(180 times;30 times,6 rounds)was conducted to assess the attractiveness of these 2 feeds for crabs.Finally,a total of 80 crabs(44.10±0.80 g)were randomly assigned into 2 groups with 4 replicates,and fed the experimental diets for 8 weeks to evaluate the effects of each feed on growth,antioxidant capacity,meat flavor,and intestinal microbiota.In this study,FD showed higher levels of crude protein(P<0.01),soluble protein(P<0.01),amino acids(P<0.05),lactic acid(P<0.001),and lower levels of crude fiber(P<0.05)and antinutritional factors(agglutinin,trypsin inhibitor,glycinin,andβ-conglycinin)(P<0.001)than NFD.Additionally,FD was more attractive to crabs than NFD(P<0.01)and it stimulated the appetite of crabs more than NFD(P<0.05).The growth performance,feed efficiency,and digestive enzyme activity of FDfed crabs were significantly higher than those of NFD-fed crabs(P<0.05).The electronic sensory measurements and free amino acid profiles revealed that the FD diet had positive impacts on the meat flavor of crabs,particularly in“sweet”and“umami”tastes.Moreover,the antioxidant capacity of FD-fed crabs was significantly higher than that of NFD-fed crabs(P<0.05).Fermented feed also affected the diversity and composition of intestinal microflora.The functional prediction of microbial communities showed that crabs fed FD had a better microecological environment in the intestine.In conclusion,the fermentation of aquafeed could be an effective approach to enhance feed quality and therefore benefit E.sinensis rearing. | Weibo Jiang Xiaoyan Jia Ningjun Xie Chuang Wen Shuo Ma Guangzhen Jiang Xiangfei Li Cheng Chi Dingdong Zhang Wenbin Liu | 2023 | Animal Nutrition2023，，3： | 0 |
| 8 | Effects of biochar-amended alkali-activated slag on the stabilization of coral sand in coastal areas显示文摘Coral sand is widely encountered in coastal areas of tropical and subtropical regions.Compared with silica sand,it usually exhibits weaker performance from the perspective of engineering geology.To improve the geomechanical performance of coral sand and meet the requirement of foundation construction in coastal areas,a novel alkali activation-based sustainable binder was developed.The alkaliactivated slag(AAS)binder material was composed of ground granulated blast-furnace slag(GGBS)and hydrated lime with the amendment of biochar,an agricultural waste-derived material.The biocharamended AAS stabilized coral sand was subjected to a series of laboratory tests to determine its mechanical,physicochemical,and microstructural characteristics.Results show that adding a moderate amount of biochar in AAS could improve soil strength,elastic modulus,and water holding capacity by up to 20%,70%,and 30%,respectively.Moreover,the addition of biochar in AAS had a marginal effect on the sulfate resistance of the stabilized sand,especially at high biochar content.However,the resistance of the AAS stabilized sand to wet-dry cycles slightly deteriorated with the addition of biochar.Based on these observations,a conceptual model showing biochar-AAS-sand interactions was proposed,in which biochar served as an internal curing agent,micro-reinforcer,and mechanically weak point. | Xiaole Han Ningjun Jiang Fei Jin Krishna RReddy Yijie Wang Kaiwei Liu Yanjun Du | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，3： | 0 |
| 9 | Fast level-flight to hover mode transition and altitude control in tiltrotor’s landing operation显示文摘An attempt is made to implement a faster level-flight to hover mode transition in tiltrotor’s landing process for the purpose of shortening its landing time. A three-stage tiltrotor landing maneuver is designed, and corresponding control modules and algorithms are created based on the analysis of the flight dynamics and the required actions of tiltrotor’s landing operation. As the altitude control is vital for tiltrotor’s near-ground landing, an Extended State Observer(ESO) control module of the Active Disturbance Rejection Control(ADRC) is designed to reduce altitude fluctuations in the fast mode transition, which makes the designed maneuver workable at very low altitudes. Simulations are conducted to verify the effectiveness of the designed maneuver and the validity of ESO control in various flight conditions. Flight test results that finally prove the effectiveness of the desired fast transition maneuver are reported. | Ningjun LIU Zhihao CAI Yingxun WANG Jiang ZHAO | 2021 | Chinese Journal of Aeronautics2021，34，1： | 0 |
| 10 | NH_(3)‑Induced In Situ Etching Strategy Derived 3D‑Interconnected Porous MXene/Carbon Dots Films for High Performance Flexible Supercapacitors显示文摘2D MXene(Ti_(3)CNT_(x))has been considered as the most promising electrode material for flexible supercapacitors owing to its metallic conductivity,ultra-high capacitance,and excellent flexibility.However,it suffers from a severe restacking problem during the electrode fabrication process,limiting the ion transport kinetics and the accessibility of ions in the electrodes,especially in the direction normal to the electrode surface.Herein,we report a NH_(3)-induced in situ etching strategy to fabricate 3D-interconnected porous MXene/carbon dots(p-MC)films for high-performance flexible supercapacitor.The pre-intercalated carbon dots(CDs)first prevent the restacking of MXene to expose more inner electrochemical active sites.The partially decomposed CDs generate NH_(3)for in situ etching of MXene nanosheets toward 3D-interconnected p-MC films.Benefiting from the structural merits and the 3D-interconnected ionic transmission channels,p-MC film electrodes achieve excellent gravimetric capacitance(688.9 F g^(-1)at 2 A g^(-1))and superior rate capability.Moreover,the optimized p-MC electrode is assembled into an asymmetric solid-state flexible supercapacitor with high energy density and superior cycling stability,demonstrating the great promise of p-MC electrode for practical applications. | Yongbin Wang Ningjun Chen Bin Zhou Xuefeng Zhou Ben Pu Jia Bai Qi Tang Yan Liu Weiqing Yang | 2023 | Nano-Micro Letters2023，15，12： | 0 |
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