|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | FY-3E:The First Operational Meteorological Satellite Mission in an Early Morning Orbit显示文摘Fengyun-3 E(FY-3E),the world’s first early-morning-orbit meteorological satellite for civil use,was launched successfully at the Jiuquan Satellite Launch Center on 5 July 2021.The FY-3E satellite will fill the vacancy of the global early-morning-orbit satellite observation,working together with the FY-3C and FY-3D satellites to achieve the data coverage of early morning,morning,and afternoon orbits.The combination of these three satellites will provide global data coverage for numerical weather prediction(NWP)at 6-hour intervals,effectively improving the accuracy and time efficiency of global NWP,which is of great significance to perfect the global earth observing system.In this article,the background and meteorological requirements for the early-morning-orbit satellite are reviewed,and the specifications of the FY-3E satellite,as well as the characteristics of the onboard instrumentation for earth observations,are also introduced.In addition,the ground segment and the retrieved geophysical products are also presented.It is believed that the NWP communities will significantly benefit from an optimal temporal distribution of observations provided by the early morning,mid-morning,and afternoon satellite missions.Further benefits are expected in numerous applications such as the monitoring of severe weather/climate events,the development of improved sampling designs of the diurnal cycle for accurate climate data records,more efficient monitoring of air quality by thermal infrared remote sensing,and the quasicontinuous monitoring of the sun for space weather and climate. | Peng ZHANG Xiuqing HU Qifeng LU Aijun ZHU Manyun LIN Ling SUN Lin CHEN Na XU | 2022 | Advances in Atmospheric Sciences2022，39，1： | 13 |
| 2 | New method for camera pose estimation based on line correspondence显示文摘The key technology of the measuring method of pose shaking of unstable platform based on CCD lies in the camera pose estimation.A new method for camera pose estimation based on line correspondence is put forward in this paper.First,two appropriate lines are selected in the space to establish a local coordinate system,the remaining lines form three-line sets with these two lines respectively and then the angle depth of the lines of the local coordinate system can be obtained by using the linearity of interpretation plane;then the invariance of included angle between spatial coordinate system and camera coordinate system during rigid transformation is used to establish a constraint equation set of angle depth of three lines similar to traditional P3P,and the corresponding angle depth of the third line in the set can be obtained linearly by variable substitution;finally,the rotation matrix can be expressed with quaternion and the pose parameters of camera in the space can be calculated by singular value decomposition(SVD).The static experiment and dynamic experiment verify the accuracy and stability of the algorithm and that the camera pose shocking is within 1°and the 3σ error is superior to 0.3′.The method in this paper can be directly used in the micro-vibration measurement of experimental platform and robot navigation and other fields and is of important theoretical significance and engineering application prospect. | LIU JinBo ZHANG XiaoHu LIU HaiBo YUAN Yun ZHU ZhaoKun YU QiFeng | 2013 | Science China(Technological Sciences)2013，56，11： | 11 |
| 3 | Vision navigation for aircrafts based on 3D reconstruction from real-time image sequences显示文摘In this paper,we propose a novel vision navigation method based on three-dimensional(3D)reconstruction from real-time image sequences.It adapts 3D reconstruction and terrain matching to establish the correspondence between image points and3D space points and the terrain reference(by using a digital elevation map(DEM)).An adaptive weighted orthogonal iterative pose estimation method is employed to calculate the position and attitude angle of the aircraft.Synthesized and real experiments show that the proposed method is capable of providing accurate navigation parameters for a long-endurance flight without using a global positioning system or an inertial navigation system(INS).Moreover,it can be combined with an INS to achieve an improved navigation result. | ZHU ZunShang SU Ang LIU HaiBo SHANG Yang YU QiFeng | 2015 | Science China(Technological Sciences)2015，58，7： | 8 |
| 4 | Higher-Ordered Actin Structures Remodeled by Arabidopsis ACTIN-DEPOLYMERIZING FACTOR5 Are Important for Pollen Germination and Pollen Tube Growth显示文摘肌动朊细胞骨架的动力学为花粉萌芽和花粉试管生长是必要的。使解聚肌动朊的因素(ADF ) 典型地由切断 / 使解聚肌动朊细丝贡献肌动朊周转。最近,我们证明 Arabidopsis 亚纲 III ADF (ADF5 和 ADF9 ) 从保存 F-actin-depolymerizing 功能发展了 F-actin-bundling 功能。然而,很少对生理的功能,进化意义,和这些 neofunctionalized ADF 的肌动朊捆绑机制被知道。这里,我们报导 ? 引起的 ADF5 功能的那损失推迟了花粉萌芽,延迟的花粉试管生长,并且增加对由影响肌动朊捆的产生和维护的 latrunculin B (LatB ) 处理敏感。在生活房间的肌动朊细丝动力学的检查表明捆绑频率显著地在 adf5 花粉试管被减少,与它的生物化学的功能一致。进一步生物化学、基因的互补分析 ? 两个都表明了那 N-? 并且 ADF5 的 C 终端肌动朊绑定域为它的生理、生物化学的函数被要求。有趣地,当两个是不正常的肌动朊捆绑 ADF, ADF5,然而并非 ADF9 时,在成熟花粉起一个重要作用生理的活动。一起拿,我们的结果建议 ADF5 发展了捆绑肌动朊细丝的功能并且在花粉萌芽和花粉试管生长期间在肌动朊捆的形成,组织,和维护起一个重要作用。 | Jingen Zhu Qiong Nan Tao Qin Dong Qian Tonglin Mao Shunjie Yuan Xiaorong Wu Yue Niu Qifeng Bai Lizhe An Yun Xiang | 2017 | Molecular Plant2017，10，8： | 6 |
| 5 | Videometric research on deformation measurement of large-scale wind turbine blades显示文摘Utilization of wind energy is a promising way to generate power,and wind turbine blades play a key role in collecting the wind energy effectively.This paper attempts to measure the deformation parameter of wind turbine blades in mechanics experiments using a videometric method. In view that the blades experience small buckling deformation and large integral deformation simultaneously, we proposed a parallel network measurement(PNM) method including the key techniques such as camera network construction,c... | Xiangyi Sun,Yun Yuan,~(a))Zhaokun Zhu,Xiaohu Zhang,and Qifeng Yu College of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073, Hunan,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，1： | 5 |
| 6 | Correction method for non-landing measuring of vehicle-mounted theodolite based on static datum conversion显示文摘During the non-landing measuring of vehicle mounted theodolite, especially under high-speed tracking measurement, the misalignment of theodolite's center of mass and spindle etc. will cause high-frequency vibration of theodolite platform, increase the observation error of targets and even unbelievable results. In this paper, a correction method of non-landing measuring of theodolite based on static datum conversion is presented, which can effectively improve the observation accuracy of theodolite. The CCD camera is fixed to the theodolite platform to calculate the gesture shaking quantity of theodolite platform in geodetic coordinate system through the real time imaging of static datum. The observation results of theodolite are corrected by using such shaking quantity. The experiment shows that the correction accuracy exceeds 10 s of arc. The intrinsic parameter calibration technology of camera based on stellar angular distance and absolute conic put forward in this paper can prevent the estimated error of extrinsic parameters influencing the intrinsic parameter calibration and improve the intrinsic parameter calibration accuracy; the static datum conversion technology can reduce the influence of installation error of camera and theodolite platform on gesture measuring of the platform. The simulation experiment shows that when the shaking range of the platform is less than 30 min of arc, the influence of the three-axis installation error of camera within 3deg on the accuracy of correction results is less than 8 s of arc. The method in this paper can be extended to and used in the field of gesture shaking measuring and micro-structure deformation of various unstable platforms, therefore it is of important theoretical research significance and has wide engineering application prospect. | LIU JinBo ZHANG XiaoHu LIU HaiBo YUAN Yun ZHU ZhaoKun YU QiFeng | 2013 | Science China(Technological Sciences)2013，56，9： | 5 |
| 7 | A displacement-relay videometric method for surface subsidence surveillance in unstable areas显示文摘When measuring the surface subsidence of unstable areas such as railroad beds and large construction fields, it is not practical to always find stable positions to install measurement instruments. Yet installing those instruments in unstable positions will cause measurement errors or even the complete failure of long-term subsidence surveillance. In this paper, the innovative concept and its method of 'displacement-relay videometrics' are proposed. With the method, a double-headed camera is designed, and two constraints, the 'fixation constraint' and the 'homologous constraint', are established to construct the displacement-relay measurement equations, which can concurrently give the subsidence of the points to be measured and the positions where the cameras are fixed. The method and its measurement system are thus capable of automatically measuring the surface subsidence under the condition that the cameras are mounted on unstable locations over long durations. Therefore, the method has the broad prospect of undertaking automatic, long-term and continuous measurement for surface subsidence in engineering projects such as railroad beds, bridges and the ground beds of tall buildings. The proposed method opens a new area that cameras can be mounted on unstable platform to make high accuracy measurements, which is of great significance for applications. | YU QiFeng JIANG GuangWen SHANG Yang XU Yong LIU XiaoLin FU SiHua GUAN BangLei ZHU XianWei | 2015 | Science China(Technological Sciences)2015，58，6： | 5 |
| 8 | Full-parameter vision navigation based on scene matching for aircrafts显示文摘Vision navigation based on scene matching between real-time images and a reference image has many advantages over the commonly used inertial navigation system(INS),such as no cumulative measurement errors for long-endurance flight.Recent developments in vision navigation are mainly used for partial navigation parameters measurements,such as the position and the relative velocity,which cannot meet the requirements of completely autonomous navigation.We present the concept,principle and method of full-parameter vision navigation(FPVN)based on scene matching.The proposed method can obtain the three-dimensional(3D)position and attitude angles of an aircraft by the scene matching for multiple feature points instead of a single point in existing vision navigations.Thus,FPVN can achieve the geodetic position coordinates and attitude angles of the aircraft and then the velocity vector,attitude angular velocity and acceleration can be derived by the time differentials,which provide a full set of navigation parameters for aircrafts and unmanned aerial vehicles(UAVs).The method can be combined with the INS and the cumulative errors of the INS can be corrected using the measurements of FPVN rather than satellite navigation systems.The approach provides a completely autonomous and accurate navigation method for long-endurance flight without the help of satellites. | YU QiFeng SHANG Yang LIU XiaoChun LEI ZhiHui LI Xiang ZHU XianWei LIU XiaoLin YANG Xia SU Ang ZHANG XiaoHu ZHANG HongLiang | 2014 | Science China(Information Sciences)2014，57，5： | 3 |
| 9 | Protective effects of proanthocyanidins on beta-amyloid peptide (25-35)-induced PC12 cell apoptosis by blocking S-phase and increasing p53 gene expression显示文摘BACKGROUND: Current studies related to the effects of proanthocyanidins on Alzheimer’s disease have focused primarily on the signal transduction pathway of cellular apoptosis.However,the influence of p53 gene expression on cell cycle regulation,with regard to the protective mechanisms of proanthocyanidins,has not been reported.OBJECTIVE: To observe the effect of proanthocyanidins on cell cycle distribution,cellular apoptosis,and p53 gene expression in β-amyloid peptide (25-35) (Aβ25-35)-induced PC12 cells cultured in serum-free media,and to investigate the molecular neuroprotective mechanisms of proanthocyanidins with regard to cell cycle regulation.DESIGN,TIME AND SETTING: A parallel,controlled,cellular,and molecular study was performed at the Institute of Biochemistry and Molecular Biology,Guangdong Medical College from July 2006 to July 2008.MATERIALS: Proanthocyanidins were provided by Nanjing Xuezi Medical and Chemical Research Center,China;Aβ25-35 was provided by Sigma,USA;PC12 cells were provided by the Institute of Basic Medical Science,Academy of Military Medical Sciences;and rabbit anti-p53 polyclonal antibody was provided by Santa Cruz Biotechnology,USA.METHODS: PC12 cells were cultured in serum-free media for 24 hours.Cells from the model group were treated with 25 μmol/L Aβ25-35 for 24 hours.Cells in the drug protection group were pre-treated with 30 mg/L proanthocyanidins for 1 hour and then treated with 25 μmol/L Aβ25-35 for 24 hours.The control group was not treated.MAIN OUTCOME MEASURES: Flow cytometry was used to detect cell cycle distribution and rate of apoptosis;reverse-transcriptase polymerase chain reaction was used to detect p53 mRNA expression;and Western blot was used to detect p53 protein expression.RESULTS: After treating with 25 μmol/L Aβ25-35 for 24 hours,the rate of apoptosis and the percentage of cells in S phase were significantly increased (P < 0.01),and p53 mRNA and protein expressions were decreased.Pretreatment with proanthocyanidins for 1 hour blocked the increase in apoptosis and the percentage of cells in S phase in Aβ25-35-induced PC12 cells (P < 0.01) and increased p53 mRNA and protein expressions.CONCLUSION: Proanthocyanidins blocked apoptosis and S-phase arrest in Aβ25-35-induced PC12 cells cultured in serum-free media.The protective mechanism could be related to increased p53 mRNA and protein expressions. | Hanfang Mei Zhaoyang Xie Qifeng Zhu | 2010 | Neural Regeneration Research2010，5，2： | 2 |
| 10 | Ru/NC heterointerfaces boost energy-efficient production of green H_(2)over a wide pH range显示文摘Green hydrogen(H_(2))is an import energy carrier due to the zero-carbon emission in the energy cycle.Nevertheless,green H_(2)production based on electrolyzer and photovoltaics(EZ/PV)remains limited due to the highly pH-dependant and energy exhausting overall water splitting.Herein,we report a series of Ru-nanocluster-modified mesoporous nanospheres(Rux@mONC)as pH-universal electrocatalysts towards both hydrogen evolution reaction(HER)and hydrazine oxidation reaction(HzOR).The optimal catalyst Ru_(2)0@mONC realizes remarkable catalytic activity and stability towards both HER and HzOR regardless of electrolytes.As a result,the electrode pair of Ru_(2)0@mONC//Ru_(2)0@mONC requires low cell-potentials of 39/429,405/926,and 164/1,141 mV to achieve the current density of 10/100 mA·cm^(−2),as well as the long-term stability for HzOR assisted electrochemical water splitting in alkaline,acidic,and neutral media,respectively.Those performances are more promising compared to the state-of-the-art electrocatalysts so far reported.A proof-of-concept test demonstrates an efficient production of green H_(2)powered by a single-junction silicon solar cell,which may inspire the use of a cost-effective EZ/PV system.Furthermore,a combined spectroscopic and theoretical study verifies the formation of abundant Ru/NC heterointerfaces in Ru_(2)0@mONC,which not only contributes to the balancing of H*adsorption/desorption in HER but also facilitates the*N_(2)H_(2)dehydrogenation in HzOR. | Qifeng Yang Botao Zhu Feng Wang Cunjin Zhang Jiahao Cai Peng Jin Lai Feng | 2022 | Nano Research2022，15，6： | 1 |
| 11 | Non-linear feature extraction for robust speech recognition in stationary and non-stationary noise显示文摘 | ZHU Qifeng Alwan A | 2003 | Computer Speech & Language2003，17，4： | 1 |
| 12 | Effect of clausenamide on hippocampal neuron apoptosis induced by sodium nitroprusside显示文摘BACKGROUND: Aggregation of β-amyloid peptide (Aβ), excitatory intoxication, oxidation injury and inflammation reaction are generally regarded as the main pathogenesis for Alzheimer disease (AD). (–) clausenamide is characterized by promoting intelligent development, resisting oxidation, cleaning free radicals, resisting Aβ neurotoxicity and nerve cell apoptosis, inhibiting over phosphorylation of tau protein, and improving central cholinergic system. However, whether (– ) clausenamide has an effect on hippocampal neuron apoptosis or not need further study. OBJECTIVE: To observe the effect of (–) clausenamide on survival rate of hippocampal neurons due to sodium nitroprusside (SNP) and analyze the possible pathways. DESIGN: Contrast observation. SETTING: Institute of Biochemistry and Molecular Biology, Guangdong Medical College. MATERIALS: A total of 12 male SD rats of 24 hours old were provided by the Experimental Animal Center of Guangdong Medical College. The primer was synthesized by Beijing Huada Genetic Engineering Company and (–) clausenamide (99.6%) was provided by Pharmacological Department of Chinese Academy of Medical Sciences. SNP was provided by Sigma Company. METHODS: Bilateral hippocampus was collected from newborn rats to establish single cell suspension. On the 12th day, hippocampal neurons were pretreated with 0.2, 0.4, 0.8 and 1.6 μmol/L (–) clausenamide for 6 hours; the culture medium was gotten rid of and neurons were washed with non-serum DMEM solution for three times. In addition, non-serum DMEM solution was added with the above mentioned volume of (–) clausenamide and 50 μmol/L SNP to culture neurons for 24 hours and the collected cells were prepared for the experiment. Neurons were equally divided into control group (culture medium control), model group (SNP treatment) and experimental group [(–) clausenamide + SNP]. Experiment of each group was done for three times at least. Survival rate of cells was measured with MTT chromatometry; levels of mRNA of hippocampal neuron bcl-2 and bax gene were detected with reverse transcription polymerase chain reaction (RT-PCR); expression of hippocampal neuron Bcl-2 and Bax protein was measured with Western blot technique. MAIN OUTCOME MEASURES: ① Effect of (–) clausenamide on survival rate of SNP-induced hippocampal neuron apoptosis; ② bcl-2 and bax mRNA and protein expression of hippocampal neurons. RESULTS: ① Survival rate of hippocampal neurons: Survival rate of hippocampal neurons affected by 0.4–1.6 μmol/L (–) clausenamide was higher in the experimental group than the model group (P < 0.01), and the survival rate was increased with the larger volume of (–) clausenamide. Survival rate was the highest when hippocampal neurons were induced by 1.6 μmol/L, and it had obvious dosage dependence (P < 0.01). ② Expression of bcl-2 and bax mRNA: Hippocampal neurons were pretreated with 0.2–1.6 μmol/L (–) clausenamide for 6 hours in the experimental group and strap of PCR product of bcl-2 gene was brightened gradually. This suggested that, with the increase of concentration, expression of bcl-2 mRNA was increased simultaneously. However, when strap of PCR product of bax gene was darkened, expression of bax was decreased with the increase of concentration. ③ Expression of Bcl-2 and Bax protein: Hippocampal neurons were pretreated with 0.2–1.6 μmol/L (–) clausenamide for 6 hours in the experimental group and strap of PCR product of Bcl-2 protein was thickened gradually. This suggested that, with the increase of concentration, expression of Bcl-2 protein was increased simultaneously. However, when strap of PCR product of Bax protein was thinned, expression of Bax protein was decreased with the increase of concentration. CONCLUSION: (–) clausenamide can resist neurotoxic effect of SNP through dosage dependence, and the mechanism may be related to promoting expression of anti-apoptotic bcl-2 gene and inhibiting expression ofpro-apoptotic bax gene. | Yongjun Liu Qifeng Zhu | 2007 | Neural Regeneration Research2007，2，1： | 1 |
| 13 | Integrated production planning and scheduling on automobile assembly lines 显示文摘 | Yan Hongsen Xia Qifeng Zhu Mirau | 2003 | IIE Transactions2003，，35： | 1 |
| 14 | Noise Robust Feature Extraction for ASR using the Aurora 2 Database 显示文摘 | ZHU QIFENG MARKUS ISELI XIAODONG CUI ABEER ALWAN | | Abeer Alwan Department of Electrical Engineering University of California0，，： | 1 |
| 15 | Testin is a tumor suppressor and prognostic marker in breast cancer显示文摘 | Jiang Zhu Xiaoyan Li Xiangnan Kong Meena S. Moran Peng Su Bruce G. Haffty Qifeng Yang | 2012 | Cancer Sci2012，，： | 1 |
| 16 | Comparing the Efficacy of a Multimodular Flexible Ureteroscope With Its Conventional Counterpart in the Management of Renal Stones显示文摘 | Jie Ding Ding Xu Qifeng Cao Tao Huang Yunkai Zhu Kai Huang Yifan Chen Chengcai Liang Jun Qi Yunteng Huang | 2015 | Urology2015，，： | 1 |
| 17 | Spatial and temporal patterns of the sensitivity of radial growth response by Picea schrenkiana to regional climate change in the Tianshan Mountains显示文摘Climate change significantly impacts forest ecosystems in arid and semi-arid regions.However,spatiotemporal patterns of climate-sensitive changes in individual tree growth under increased climate warming and precipitation in north-west China is unclear.The dendrochronological method was used to study climate response sensitivity of radial growth of Picea schrenkiana from 158 trees at six sites during 1990-2020.The results show that climate warming and increased precipitation significantly promoted the growth of trees.The response to temperature first increased,then decreased.However,the response to increased precipitation and the self-calibrating Palmer Drought Severity Index(scPDSI)increased significantly.In most areas of the Tianshan Mountains,the proportion of trees under increased precipitation and scPDSI positive response was relatively high.Over time,small-diameter trees were strongly affected by drought stress.It is predicted that under continuous warming and increased precipitation,trees in most areas of the Tianshan Mountains,especially those with small diameters,will be more affected by precipitation. | Zhongtong Peng Yuandong Zhang Liangjun Zhu Mingming Guo Qingao Lu Kun Xu Hui Shao Qifeng Mo Shirong Liu | 2023 | Journal of Forestry Research2023，34，6： | 1 |
| 18 | Integrated produc- tion planning and scheduling on automobile assembly lines 显示文摘 | Yan Hongsen Xia Qifeng Zhu Minru | 2003 | IIE Transactions2003，35，8： | 1 |
| 19 | Isolation and degradationability of the DDT-degrading bacterial strain KK 显示文摘 | XIE Hui ZHU Lusheng XU Qifeng | 2011 | EnvironmentalEarth Sciences2011，62，1： | 1 |
| 20 | Synthesis and potential anticonvulsant activity of new N-3-substituted 5,5- eyclopropanespirohydantoins 显示文摘 | Zhu Qifeng Pan Yunhua Xu Zaixue | 2009 | European Journal of Me- dicinal Chemistry2009，44，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员