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| 1 | Catalytic oxidation of benzene over Ce-Mn oxides synthesized by flame spray pyrolysis显示文摘Flame spray pyrolysis(FSP) was utilized to synthesize Ce-Mn oxides in one step for catalytic oxidation of benzene.Cerium acetate and manganese acetate were used as precursors.The materials synthesized were characterized using X-ray diffraction(XRD),N_2 adsorption,X-ray photoelectron spectroscopy(XPS).transmission electron microscopy(TEM),Raman spectroscopy,and Fh-temperature programmed reduction(H_2-TPR) and their benzene catalytic oxidation behavior was evaluated.Mn ions were evidenced in multiple chemical states.Crystalline Ce-Mn oxides consist of particles with size <40 nm and specific surface areas(SSA) of 20-50m^2/g.Raman spectrums and H_2-TPR results indicated the interaction between cerium and manganese oxides.Flame-made 12.5%-Ce-Mn oxide exhibited excellent catalytic activity at relatively low temperatures(T95 about 260 C) compared to other Ce-Mn oxides with different ceriumto-manganese ratios.Redox mechanism and strong interaction conform to structure analysis that Ce-Mn strong interaction formed during the high temperature flame process and the results were used to explain catalytic oxidation of benzene. | Gang Liu Renliang Yue Yi Jia Yong Ni Jie Yang Haidi Liu Zhen Wang Xiaofeng Wu Yunfa Chen | 2013 | Particuology2013，11，4： | 17 |
| 2 | Light scattering:A review of particle characterization applications显示文摘This review covers the progress of light scattering applications in the field of particle characterization in the past decade.The review addresses static light scattering(the measurement of scattering intensities due to light-particle interaction at various spatial locations),dynamic light scattering(the measurement of scattering due to light-particle interaction as a function of time),and scattering tracking analysis(the tracking of particle movement through scattering measurement). | Renliang Xu | 2015 | Particuology2015，13，1： | 15 |
| 3 | Process mineralogy of Weishan rare earth ore by MLA显示文摘Mineral liberation analyser(MLA) was applied to quantitatively analyze the rare earth ore from Weishan in Shandong. Mineralogy parameters, such as mineral composition, occurrence states of rare earth elements(REEs) and valuable elements, mineral embedded grain size distribution, mineral association and liberation, are obtained. Results show that the contents of REEs and other valuable elements mainly contained in the ore were La 1.02 wt%, Ce 4.29 wt%, Pr 0.34 wt%, Nd 0.84 wt%, Sr 3.4 wt%and Ba 26.53 wt%, respectively. The REEs mainly occur in bastnaesite and carbocernaite in the form of independent mineral and the contents of bastnaesite and carbocernaite in the ore were 5.96 wt% and12.30 wt%, respectively. 67.34% of strontium occurs in carbocernaite and the rest occurs in celestobarite and strontianite mineral. 92.71% of barium occurs in barite. Liberation of main rare-earth minerals such as bastnaesite and carbocernaite is more than 80% when the grinding fineness is78.42% passing 74 μm. The research results could be employed to provide detailed basic theoretical data for further improvement of the beneficiation process flow and the processing index of rare earth ore, the recycling of other valuable minerals and the comprehensive utilization of tailings. | Caili Xu Chengbin Zhong Renliang Lyu Yaoyang Ruan Zhenyue Zhang Ru'an Chi | 2019 | Journal of Rare Earths2019，37，3： | 12 |
| 4 | Study of helicopter autorotation landing following engine failure based on a six-degree-of-freedom rigid-body dynamic model显示文摘This paper focuses on the prediction of the safe autorotation landing operations of a helicopter following engine failure.The autorotation landing procedure is formulated as a nonlinear optimal control problem based on an augmented six-degree-of-freedom rigid-body flight dynamic model.First,the cost function and constraints are properly selected.The direct transcription approach is then employed to solve the optimal control problem.For a UH-60 helicopter,the optimal solutions with the rigid-body model are compared with those obtained using a two-dimensional point-mass model.It is found that the optimal solutions using the two different models show reasonably good agreement,and furthermore the optimal solutions using the rigid-body model involve the time histories of angular rates and attitudes,lateral velocity and position,as well as pitch controls.Finally the optimal control formulations with different cost functions are proposed for taking account of 1-s time delay and minimum touchdown speed.The calculated control strategies and trajectories are realistic. | Meng Wanli Chen Renliang | 2013 | Chinese Journal of Aeronautics2013，26，6： | 10 |
| 5 | Progress in nanoparticles characterization:Sizing and zeta potential measurement显示文摘Characterization of various nanoparticles is on the center stage in nanotechnology development.The subjects for nanoparticles characterization are focused on particle size and particle surface charge determinations.This article summarizes the latest development in particle size analysis using dynamic light scattering and surface charge determination using electrophoretic light scattering for nano-or even sub-nanoparticles in concentrated suspensions. | Renliang Xu | 2008 | Particuology2008，6，2： | 10 |
| 6 | Enhancing mineral liberation of a Canadian rare earth are with microwave pretreatment显示文摘Liberation. as an attribute of mineralogy characteristic. whose impacts on finely disseminated Canadian rare earth ore was studied with microwave pretreatment. Samples of a light rare earth ore along with mostly ankerite and biotite as dominant gangue minerals as well as bastnaesite, strontianite and goethite as dominated minerals were exposed to further comminution by ball mill and microwave pretreatment fragmentation. Mineralogical characteristics were analyzed by using a mineral liberation analyzer(MLA).The results indicated that tight association mutually penetrates among dominated minerals in the range size of -300 + 212 μm and 212 + 150 μm and gangue minerals in the form of adjacent type. fine vein type. shell type and packing type. Temperature in the ore samples pre-treated by microwave can rapidly rise to 250 ℃ with microwave power of 0-1.5 kW and microwave time of 0-2 min. Applying the microwave pretreatment merely reduces the hardness of the ore causing the fracture of rare earth ore, but this does not transform or change the original mineralogy characteristics of the ore samples. On the basis of above study. the liberation value of bastnaesite, strontianite and goethite with microwave pretreatment is greater than with conventional comminution when the liberation class is above 75%. The distribution of particle size of rare earth ore samples is better with microwave pretreatment than with conventional comminution for particle size of 7.4 × 10^(-5) m. With microwave pretreatment, the theoretical grade-recovery of bastnaesite. strontianite and goethite in the rare earth ore attains better results than with conventional comminution at a given grade. | Chengbin Zhong Caili Xu Renliang Lyu Zhenyue Zhang Xiaoyan Wu Ru'an Chi | 2018 | Journal of Rare Earths2018，36，2： | 10 |
| 7 | PARTICLE CHARACTERIZATION: LIGHT SCATTERING METHODS显示文摘 | Renliang Xu Beckman Coulter, Miami, FL, USA | 2003 | China Particuology2003，1，6： | 9 |
| 8 | Dynamic property tests of frozen red sandstone using a split hopkinson pressure bar显示文摘In this study, frozen red sandstone specimens were impacted by a Split Hopkinson bar (SHPB), with a velocity of 4.558 ~ 6.823 ms-1. The temperature of the specimens was maintained at -15℃ during the experiment. For comparison purposes, static uniaxial compression tests were conducted in advance using a freezing triaxial test machine. Four stress-strain curves were obtained in diff erent average strain rates. The test results suggested that when the average strain rate is low, the specimen strength changes gradually;but when it is high, its strength changes rapidly. When the average strain rate is 120.73 s-1, the peak value of stress is as high as 82.96 MPa, which is about two times that of the static compressive strength of 44.1 MPa. A constitutive model was established that was composed of the damaged, viscoelastic and spring bodies, and revealed the variations of compressive strength and strain for the frozen red sandstone under diff erent high strain rates. The test results also showed that the failure form was correlated to the average strain rate of the frozen red sandstone. When the average strain rate is low, the damage was only distributed on the specimen’s edges. However, as the average strain rate increases, the damage range extended to the central parts of the specimen. When the average strain rate reached 107.34s-1, the specimen was smashed. | Shan Renliang Song Yongwei Song Liwei Bai Yao | 2019 | Earthquake Engineering and Engineering Vibration2019，18，3： | 8 |
| 9 | Augmented flight dynamics model for pilot workload evaluation in tilt-rotor aircraft optimal landing procedure after one engine failure显示文摘An augmented flight dynamics model is developed to extend the existing flight dynamics model of tilt-rotor aircraft for optimal landing procedure analysis in the event of one engine failure.Compared with the existing flight dynamics model, the augmented model involves with more pilot control information in cockpit and is validated against the flight test data. Based on the augmented flight dynamics model, the optimal landing procedure of XV-15 tilt-rotor aircraft after one engine failure is formulated into a Nonlinear Optimal Control Problem(NOCP), solved by collocation and numerical optimization method. The time histories of pilot controls in cockpit during the optimal landing procedure are obtained for the evaluation of pilot workload. An evaluation method which can synthetically quantify the pilot workload in time and frequency domains is proposed with metrics of aggressiveness and cutoff frequencies of pilot controls. The scale of the pilot workload is compared with those of the shipboard landing procedures, bob-up/bob-down and dash/quickstop maneuvers of UH-60 helicopter. The results show that the aggressiveness of pilot collective and longitudinal controls for the tilt-rotor aircraft optimal landing procedure after one engine failure are higher than those for UH-60 helicopter shipboard landing procedures up to the condition of sea state 4, while the pilot cutoff frequency of collective control is lower than that of the bob-up/bob-down maneuver but the pilot cutoff frequency of longitudinal control is higher than that of the dash/quick-stop maneuver. The evaluated pilot workload level is between Cooper–Harper HQR Level 2 and Level 3. | Xufei YAN Renliang CHEN | 2019 | Chinese Journal of Aeronautics2019，32，1： | 7 |
| 10 | Effects of cerium incorporation on the catalytic oxidation of benzene over flame-made perovskite La_(1-x)Ce_xMnO_3 catalysts显示文摘Perovskite-type La_(1-x)Ce_xMnO_3(x = 0-10%) catalysts were prepared by flame spray pyrolysis and their activities during the catalytic oxidation of benzene were examined over the temperature range of100-450℃.The structural properties and reducibility of these materials were also characterized by X-ray diffraction(XRD),N_2 adsorption/desorption,H_2 temperature-programmed reduction(H_2-TPR) and X-ray photoelectron spectroscopy(XPS).The incorporation of Ce was found to improve the benzene oxidation activity,and the perovskite in which x was 0.1 exhibited the highest activity.Phase composition and surface elemental analyses indicated that non-stoichiometric compounds were present.The incorporation of Ce had a negligible effect on the specific surface area of the perovskites and hence this factor has little impact on the catalytic activity.Introduction of Ce4^(4+) resulted in modification of the chemical states of both B-site ions and oxygen species and facilitated the reducibility of the perovskite.The surface Mn^(4+)/Mn^(3+)ratio was increased as a result of Ce^(4+) substitution,while a decrease in the surface-adsorbed O/lattice O(O_(ads)/O_(latt)) ratio was observed.The relationship between the surface elemental ratios and catalytic activity was established to allow a better understanding of the process by which benzene is oxidized over perovskites. | Gang Liu Jiaqi Li Kun Yang Wenxiang Tang Haidi Liu Jun Yang Renliang Yue Yunfa Chen | 2015 | Particuology2015，13，2： | 6 |
| 11 | Sonication-assisted dispersion of carbon nanotubes in aqueous solutions of the anionic surfactant SDBS:The role of sonication energy显示文摘Sonication is a powerful technique to promote the dispersion of carbon nanotubes(CNTs) and enhance their solubility;this is necessary for CNT applications,especially in the biochemical and biomedical fields.In this study,batch experiments were conducted to evaluate the role of sonication energy on the dispersion of CNTs in the presence of a widely used anionic surfactant,sodium dodecylbenzene sulfonate(SDBS).It was observed that the concentration of dispersed CNTs in the SDBS solution depended on the sonication energy,but not the sonication time or output power of the sonicator alone.The amount of dispersed CNTs was positively correlated with the concentrations of SDBS and CNTs,and the length of the CNTs.The promotion of oxygen-containing functional groups on the dispersed CNTs was observed at relatively low sonication energies.The optimal energy,i.e.the minimum energy supplied by sonication to achieve a saturated suspension of dispersed CNTs in the SDBS solution,was CNT diameter-dependent,because of the larger vdW forces between tubes of smaller diameter.An exponential decay curve was constructed for the optimal energy values as a function of the outer CNT diameter,to assist in determining the energy needed to disperse CNTs. | YANG Kun YI ZiLi JING QingFeng YUE RenLiang JIANG Wei LIN DaoHui | 2013 | Chinese Science Bulletin2013，58，18： | 5 |
| 12 | Exploration of particle technology in fine bubble characterization显示文摘Fine bubble technology has been applied in many fields, including semiconductor processing, waste water treatment, and agricultural development. Fine bubble technology has the advantages of being environ-mentally benign, and ease of production and use when compared with other processes that involve chemicals or biological agents. However, the mechanisms of fine bubble applications in many aspects still require exploration. The characterization of fine bubbles is one of the essential issues for better understanding the technology. This article reviews modern particle characterization technologies, espe-cially those that can be used to characterize fine bubbles, and briefly reports on some applications of fine bubbles. | Renliang Xu Yaru Wang Zhaojun Li | 2019 | Particuology2019，17，5： | 4 |
| 13 | Prediction of pilot workload in helicopter landing after one engine failure显示文摘This paper presents a method to predict the pilot workload in helicopter landing after one engine failure.The landing procedure is simulated numerically via applying nonlinear optimal control method in the form of performance index,path constraints and boundary conditions based on an augmented six-degree-of-freedom rigid-body flight dynamics model,solved by collocation and numerical optimization method.UH-60 A helicopter is taken as the sample for the demonstration of landing after one engine failure.The numerical simulation was conducted to find the trajectory of helicopter and the controls from pilot for landing after one engine failure with different performance index considering the factor of pilot workload.The reasonable performance index and corresponding landing trajectory and controls are obtained by making a comparison with those from the flight test data.Furthermore,the pilot workload is evaluated based on wavelet transform analysis of the pilot control activities.The workloads of pilot control activities for collective control,longitudinal and lateral cyclic controls and pedal control during the helicopter landing after one engine failure are examined and compared with those of flight test.The results show that when the performance index considers the factor of pilot workload properly,the characteristics of amplitudes and constituent frequencies of pilot control inputs in the optimal solution are consistent with those of the pilot control inputs in the flight test.Therefore,the proposed method provides a tool of predicting the pilot workload in helicopter landing after one engine failure. | Zhiming YU Xufei YAN Renliang CHEN | 2020 | Chinese Journal of Aeronautics2020，33，12： | 3 |
| 14 | STAT1 and Survivin Expression in Full Lymph Node Examined Gastric Cancer by Using Tissue Microarray Technique显示文摘客观:描绘在之间的关系 STAT1 和 Survivinexpression,和在他们和淋巴节点转移之间的关系,在完整的淋巴节点的侵略和预后的深度检查了中国的胃的癌症病人。方法:在 1988 和 2003 之间的药品解剖的标本从 JianghanUniversity 的隶属于的医院被收集。所有 140 个病人有完全的考试数据。所有淋巴结被清除胖方法发现。打断的连续剧染色 andimmunohistochemical 方法的 4 μ m 节,平淡的苏木精和曙红被用来检测淋巴节点转移。胃的癌症 tissuemicroarray 被形成,在胃的癌症的 survivin 和 STAT1 的表示是检测 byimmunohistochemical 方法。所有数据多用枪兵等级相关分析, Kaplan-Meyer 木头等级方法和考克斯被处理变量分析(社会科学统计套装软体 12.0 软件) 。结果:在微数组构造了的 140gastric 癌症织物之中, 110 能被使用(利用率是 78.6%) 。7079lymph 节点在 110 种情况(64.4/case ) 中被发现。转移在 89 种情况和 1679 个淋巴节点中被发现。survivin 和 STAT1 的积极表示率是 52.7%(58/110 ) 并且 40%(44/110 ) 分别地。在 STAT1 表示和 survivinexpression 之间有重要否定关联(r=-0.19, P=0.04 ) 。STAT1 表示与侵略的深度有否定关联(r=-0.21, P=0.04 ) 。Survivin 表示与 UICC N 舞台有否定关联(r=-0.24, P=0.01 ) 并且组织学的分类(r=-0.21, P=0.03 ) 由枪兵等级相关分析。Butsurvivin 和 STAT1 表示没与预后被联系。在淋巴节点转移和预后之间的重要关联被考克斯多表明变量分析(χ ~ 2=4.85, P=0.028 ) 。结论:STAT1 在胃的癌症与 survivin 表示有否定关联。他们俩没在胃的癌症与预后有关联。STAT1 表示能是一个分子的标记预言先进胃的癌症和 survivin 在胃的癌症的淋巴节点转移的一个分子的标记。UICC N 舞台是在在中国的胃的 caner 的最重要的预示的因素。 | DENG Hao WU Renliang CHEN Ying LIU Lijiang | 2006 | The Chinese-German Journal of Clinical Oncology2006，5，4： | 3 |
| 15 | Oscillating Cellulase Adsorption and Enhanced Lignocellulose Hydrolysis upon Ultrasound Treatment显示文摘We investigated the effects of ultrasound treatment on cellulase adsorption and lignocellulose hydrolysis.The activity of cellulase remained constant upon lowpower ultrasound treatment(<120 W) and decreased using high-power ultrasound(>280 W).Oscillating cellulase adsorption occurred upon ultrasound treatment with any intensity.The maxima for desorption and adsorption were41.9 and 83.1%,respectively,during 1 h of 90 W ultrasound treatment at 50 °C.A comparison between the shorttime with long-time ultrasound experiments indicated that ultrasound treatment tended to desorb cellulase from substrate.However,ultrasound treatment also led to further surface erosion of biomass,which increased cellulase accessibility.These joint actions of ultrasound treatment induced the oscillating adsorption of cellulase.The increase in cellulase accessibility caused by ultrasound treatment led to a significant enhancement in lignocellulose hydrolysis. | Rongxin Su Renjun Yang Yang Jifeng Ruoyu Du Renliang Huang Wei Qi Zhimin He | 2017 | Transactions of Tianjin University2017，23，1： | 3 |
| 16 | Trajectory optimization of aerial slung load release for piloted helicopters显示文摘This study aims to provide the pilot with optimal control time histories for stabilization of a helicopter after releasing the slung load in aerial delivery missions. A model with 21 degrees of freedom(21-DOF) has been developed and validated for a helicopter slung load system. The control history is generated with detailed procedure based on trajectory optimization. Effects of the objective function formulation on the results are discussed and rules are obtained to assist in the objective function determination. We conclude that the pilot should first decrease and then increase the collective control and adjust the longitudinal control to stabilize the helicopter after the in-hover slung load release. The obtained control history is reasonable and helpful for safety and efficiency improvement. Effects of path constraints and the Flight Control System(FCS) are studied. More stringent path constraints will lead to longer time spent and more controls. Stronger stiffness and weaker damping from the FCS will cause milder control histories but sharper on-axis state histories. | Luofeng WANG Renliang CHEN Xufei YAN | 2021 | Chinese Journal of Aeronautics2021，34，2： | 3 |
| 17 | Expression of hypoxia inducible factor-1 alpha and ischemic erythropoietin tolerance in the brain of cerebral ischemic tolerance model rats显示文摘BACKGROUND: Hypoxia inducible factor-1 alpha (HIF-1 α) and erythropoietin(EPO), possessing neuroprotective effect in the cerebral ischemia, might play an important role in the formation of cerebral ischemic tolerance (IT). OBJECTIVE:To observe the neuroprotective effect of cerebral ischemic preconditioning(IPC) of rats, and the expression and mechanism of HIF-1α and target gene erythropoietin in the brain tissue following the formation of cerebral IT. DESIGN:A randomized and controlled observation. SETTING: Department of Neurology, the Affiliated Hospital of Medical College, Qingdao University. MATERIALS: Totally 84 enrolled adult healthy male Wistar rats of clean grade, weighing 250 to 300 g, were provided by the Animal Experimental Department, Tongji Medical College of Huazhong University of Science and Technology. Ready-to-use SABC reagent kit and rabbit anti-rat HIF-1α monoclonal antibody were purchased from Boshide Bioengineering Co.Ltd (Wuhan); Rabbit anti-rat EPO monoclonal antibody was purchased from Santa Cruz Company (USA). METHODS: This experiment was carried out in the Department of Anatomy, Medical College, Qingdao University during March 2005 to March 2006. ① The 84 rats were divided into 3 groups by a lot: IPC group (n=40), sham-operation group (n=40) and control group (n=4). In the IPC group, middle cerebral artery was occluded for 2 hours respectively on the 1st, 3rd, 7th, 14th and 21st days of the reperfusion following 10-minute preischemia was made using a modified middle cerebral artery second suture method from Zea-Longa. The rats were sacrificed 22 hours after reperfusion in the end of middle cerebral artery occlusion (MCAO). That was to say, after 10-minute preischemia, suture was exited to the external carotid artery and embedded subcutaneously. Middle cerebral artery was occluded again to form the second reperfusion at the set time point after reperfusion. Twenty-two hours later, rats were sacrificed; In the sham-operation group,the preischemia was substituted by sham-operation(only common carotid artery and crotch were exposed, and MCAO by suture was omitted), and the other procedures were the same as those in the IPC group. In the control group, rats were given sham-operation twice at an interval of one day, and they were sacrificed 24 hours after the second sham-operation. ② Brain tissue was taken from the rats in each group. Cerebral infarction area of each layer was measured with TTC staining, and total cerebral infarction volume (The total cerebral infarction area of each layer×interspace ) was calculated. After brain tissue was stained by haematoxylin-esoin (HE), the form of nerve cells was observed under an optical microscope, and the expressions of HIF-1αand EPO protein in the brain tissue were detected with immunohistochemical method. MAIN OUTCOME MEASURES: ①Cerebral infarction volume;②form of nerve cell; ③ the expression of HIF-1α and EPO protein in the brain tissue. RESULTS:Totally 84 rats were enrolled in the experiment. The dead rats were randomly supplied during the experiment, and finally 84 rats entered the stage of result analysis. ① Detection of cerebral infarction volume of rats in each group: Cerebral infarction volume in the IPC group was significantly smaller than that in the sham-operation group on the 1st, 3rd and 7th days after reperfusion respectively [(161.2±6.9) mm3 vs (219.9±11.2) mm3, (134.9±9.0) mm3 vs (218.6±13.0) mm3, (142.9±13.7) mm3 vs (221.3±14.2) mm3, t=8.924,10.587,7.947, P < 0.01]. ② Observation of nerve cell form of brain tissue: HE staining showed that the ischemic degree, range and cerebral edema degree of IPC group were significantly milder than those of sham-operation group. ③ The expressions of HIF-1α and EPO protein in cerebral cortex and hippocampus : The expression of HIF-1αof IPC group was significantly higher than that of sham-operation group on the 1st, 3rd and 7th days after reperfusion respectively (125.93±3.79 vs 117.65±5.60, 140.63±4.64 vs 119.33±4.26, 131.15±2.74 vs 107.60±3.89, t=2.449, 6.763,9.899,P < 0.05-0.01). The expression of EPO of IPC group was significantly higher than that of sham-operation group on the 3rd and 7th days after perfusion respectively (141.68±3.29 vs 126.33±4.51, 138.88±2.59 vs 125.58±6.18,t=5.499,3.970, P < 0.05). CONCLUSION: ① IPC can protect the never cells in rat brain and the best time to onset of cerebral IT induced by IPC is 1 to 7 days after reperfusion. ② Neuroprotective effect of cerebral IT might be related to the expression of HIF-1α and its target gene EPO. | Renliang Zhao Ruijian Dong Zhongling Sun | 2006 | Neural Regeneration Research2006，1，3： | 2 |
| 18 | Filter paper-templated preparation of ZnO thin films and examination of their gas-sensing properties显示文摘ZnO thin films prepared by using quantitative filter paper as a template and Zn(CH3CO2) 2·2H2O ethanol precursor solution were characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD) . The effects of sample calcination temperature,precursor concentration and filter paper types were studied,and the growth process was investigated by infra-red(IR) spectroscopy and thermogravimetric analysis/differential thermal analysis(TGA/DTA) . The results show that samples soaked in a 1.5 mol/L Zn(CH3CO2) 2·2H2O ethanol solution and calcined at 600 °C yield ZnO films of uniform particle size,approx-imately 30,40 and 50 nm,for fast-,medium-and slow-speed filter papers,respectively. The formaldehyde gas sensing properties of the ZnO nanoparticles were tested,showing that the material prepared from fast-speed filter paper has a higher response to 120-205 ppm formaldehyde at 400 °C than that prepared from medium-or slow-speed paper,which depends on the particle size. | Bao Wang Ning Han Dong Meng Renliang Yue Jinghui Yan Yunfa Chen | 2011 | Particuology2011，9，3： | 2 |
| 19 | Heading control strategy assessment for coaxial compound helicopters显示文摘The coaxial compound helicopter has two possible strategies for heading control: collective differential and rudder deflection. A flight dynamics model is developed to assess the effect of different heading control strategies. This includes the trim characteristics, steady flight performance,controllability, and manoeuvrability. The trim study demonstrates that heading control strategies are less influential on trim results, and the steady flight performance is also not significantly affected by the heading control strategy adopted. The controllability analysis shows although heading bandwidth and phase delay results at various speeds with different heading control strategies are all satisfied, the control derivative of the collective differential decreases as speed increases, and its heading aggressive agility is degraded into Level 3 in high-speed flight. In addition, using collective differential would lead to severe heading-rolling coupling as forward speed increases. On the contrary, the control derivative and aggressive agility of the rudder deflection is improved with forward speed, and there is no evidence of heading-rolling coupling. Finally, the transient turn MissionTask-Element(MTE) is utilized to investigate the heading manoeuvre characteristics in different heading control strategies, which indicates that the collective differential would add the amplitude of control input and the power consumption during this MTE. | Ye YUAN Douglas THOMSON Renliang CHEN Richard DUNLOP | 2019 | Chinese Journal of Aeronautics2019，32，9： | 2 |
| 20 | Kinetics of nitroxide reaction with iron ( lI ) 显示文摘 | Bar-On P Mohsen M Zhang Renliang | 1999 | Journal of the American Chemical Society1999，121，35： | 1 |
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