|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Development of single row automatic transplanting device for potted vegetable seedlings显示文摘In China,low degree of automation seriously affects the working efficiency and quality in vegetable transplanting.As one of the most important vegetables in China even in the world,tomato was taken as the research object in this study.An automatic single-row transplanting device was designed,based on the statistical analysis of the physical and mechanical properties of tomato seedlings of a typical variety.Based on the technology of mechatronics,the device integrated the functions of transporting seedling tray,automatic seedling extraction and mechanical planting.The kinematics orthogonality solution combined with the dynamic sequence solution method was used to optimize and analyze the kinematic parameters of the automatic seeding mechanism,and the“sickle”trajectory was obtained.According to the position and movement requirement for taking and dropping seedling,the mechanical conditions and the working parameters of key execution parts were obtained by using analytic drawing method to analyze the mechanical condition of seedling collecting mechanism.The transplanting experiment was conducted at room temperature of 25°C,and the age and moisture content of the seedlings were 40 d and 55%,respectively.The results showed that the highest success rate was 92.59%,and the lowest rate of leakage was 23.13%,when the transplanting frequency was 60 plants/min.The lowest success rate was 77.78%,and the highest rate of leakage was 38.75%,when transplanting frequency was 120 plants/min.When the transplanting frequency is between 60-90 plants/min,the device can meet the requirement of high speed transplanting for potted vegetable seedling. | Xin Jin Daoyi Li Hao Ma Jiangtao Ji Kaixuan Zhao Jing Pang | 2018 | International Journal of Agricultural and Biological Engineering2018，11，3： | 27 |
| 2 | Significant relationship between spring AO and the summer rainfall along the Yangtze River显示文摘The influence of spring AO on the summer rainfall along the Yangtze River is investigated. The long-term rainfall observations are filtered to remove the low-frequency variations longer than 10 years. The inter-annual components show a high correlation to AO in the last hundred years. The strongest correlation appears for May AO and summer rainfall with a value of -0.39, significant above the 99% confidence level. Associated with one standard deviation stronger May AO index, the rainfall over the Yangtze River to the southern Japan decreases by about 3%-9%, while, at the same time increases by about 3%-6% in the northern China and far-eastern Russia. The coherent changes in rainfall are significantly related to the East Asian summer jet stream in the upper troposphere. When there is stronger AO in spring, the jet stream tends to move polarward in summer, and leads the rainfall-belt to move northward too. That gives rise to a drier condition in the Yangtze River valley, wetter anomalies in northern China. | GONG Daoyi ZHU Jinhong WANG Shaowu | 2002 | Chinese Science Bulletin2002，47，11： | 22 |
| 3 | Impacts of ENSO on rainfall of global land and China显示文摘Based on the analysis of X^2 test of global land rainfall time series, it is found that the mean global land annual rainfall reduce significantly when El Nio events occur, and increase evidently in La Nia years. The impacts of ENSO on the winter and autumn precipitation over eastern China are also notable. Usually, the rainfall of winter and autumn over southern China increases, and that over northern China decreases in El Nio years. The effects of ENSO on summer rainfall are not so significant as on autumn and winter rainfall in China. The summer precipitation of area to the north of the Yellow River often decreases in El Nio years. No evident relationship is found between ENSO and spring rainfall in China. | Daoyi Gong Shaowu Wang | 1999 | Chinese Science Bulletin1999，44，9： | 21 |
| 4 | Antarctic oscillation: concept and applications显示文摘Based on the NCEP/NCAR reanalysis data set, empirical orthogonal function analysis and correlation analysis have been carried out. Antarctic oscillation index (AOI) is defined as the difference between the zonal-mean monthly sea level pressure departures of 40°S and 65°S. Regional surface temperature and precipitation over the extratropical Southern Hemisphere have a close relationship with AOI. | Daoyi Gong Shaowu Wang | 1998 | Chinese Science Bulletin1998，43，9： | 15 |
| 5 | Self-organized ordering of earthquakes(M≥8) in China's Mainland显示文摘纸论述了大地震的一个新常规模式(网络结构) 在过去的 700 年期间发生在大陆中国,它可能是有用的改进大地震的理解并且能为未来伟人地震的预言的学习用作一个库。因为有在在中国的宽程度的历史、最近的地震的相当完全、充满信心的记录,它能被做。 | Xu Daoyi Men Kepei Deng Zhihui | 2010 | Engineering Sciences2010，8，4： | 10 |
| 6 | A short review on natural gas hydrate, kinetic hydrate inhibitors and inhibitor synergists显示文摘Gas hydrate-caused pipeline plugging is an industrial nuisance for petroleum flow assurance that calls for technological innovations.Traditional thermodynamic inhibitors such as glycols and inorganic salts suffer from high dosing,environmental unfriendliness,corrosiveness,and economical burden.The development and use of kinetic hydrate inhibitors(KHIs),mostly polymeric compounds,with their inhibiting effects on hydrate nucleation and growth are considered an effective and economically viable chemical treatment for hydrate prevention.However,the actual performance of a KHI candidate is dependent on various factors including its chemical structure,molecular weight,spatial configuration,effective concentration,pressure and temperature,evaluation methods,use of other additives,etc.This review provides a short but systematic overview of the fundamentals of natural gas hydrates,the prevailing categories of polymeric kinetic hydrate inhibitors with proposed inhibition mechanisms,and the various synergists studied for boosting the KHI performance.Further research endeavors are in need to unveil the KHI working modes under different conditions.The conjunctive use of KHIs and synergists may facilitate the commercial application of effective KHIs to tackle the hydrate plugging problem in the oil and gas flow assurance practices. | Wei Ke Daoyi Chen | 2019 | Chinese Journal of Chemical Engineering2019，27，9： | 10 |
| 7 | Possible influence of Arctic Oscillation on dust storm frequency in North China显示文摘这研究在 19612007 期间在春天季节在诺思中国在灰尘暴风雨频率上调查了北极摆动(AO ) 的影响。在灰尘暴风雨频率和 AO 之间有一个重要连接;一否定(积极) AO 阶段与有关一增加(减少) 在诺思中国的灰尘暴风雨频率。这种关系是仔细在蒙古与在寒冷的变化有关让活动通风。冷空气活动在灰尘暴风雨频率上施加大影响;在蒙古上的冷空气活动的频率断然不仅在诺思中国与灰尘暴风雨频率相关,而且显示出是为在诺思中国的灰尘暴风雨频率的长期的减少的一个重要原因的一个长期的减少趋势。AO 在蒙古上在冷空气活动的频率上有大影响;一否定(积极) AO 阶段是高度与有关一增加(减少) 寒冷的频率在蒙古上让活动通风,它导致一增加(减少) 在诺思中国的灰尘暴风雨频率。 | MAO Rui GONG Daoyi BAO Jingdong FAN Yida | 2011 | Journal of Geographical Sciences2011，21，2： | 9 |
| 8 | Hybrid MDP based integrated hierarchical Q-learning显示文摘As a widely used reinforcement learning method,Q-learning is bedeviled by the curse of dimensionality:The computational complexity grows dramatically with the size of state-action space.To combat this difficulty,an integrated hierarchical Q-learning framework is proposed based on the hybrid Markov decision process (MDP) using temporal abstraction instead of the simple MDP.The learning process is naturally organized into multiple levels of learning,e.g.,quantitative (lower) level and qualitative (upper) level,which are modeled as MDP and semi-MDP (SMDP),respectively.This hierarchical control architecture constitutes a hybrid MDP as the model of hierarchical Q-learning,which bridges the two levels of learning.The proposed hierarchical Q-learning can scale up very well and speed up learning with the upper level learning process.Hence this approach is an effective integral learning and control scheme for complex problems.Several experiments are carried out using a puzzle problem in a gridworld environment and a navigation control problem for a mobile robot.The experimental results demonstrate the effectiveness and efficiency of the proposed approach. | CHEN ChunLin DONG DaoYi LI Han-Xiong TARN Tzyh-Jong | 2011 | Science China(Information Sciences)2011，54，11： | 9 |
| 9 | Further results on existence-uniqueness for stochastic functional differential equations显示文摘The aim of this paper is to develop some basic theories of stochastic functional differential equations (SFDEs) under the local Lipschitz condition in continuous functions space C. Firstly, we establish a global existence-uniqueness lemma for the SFDEs under the global Lipschitz condition in C without the linear growth condition. Then, under the local Lipschitz condition in C, we show that the non-continuable solution of SFDEs still exists if the drift coefficient and diffusion coefficient are square-integrable with respect to t when the state variable equals zero. And the solution of the considered equation must either explode at the end of the maximum existing interval or exist globally. Furthermore, some more general sufficient conditions for the global existence-uniqueness are obtained. Our conditions obtained in this paper are much weaker than some existing results. For example, we need neither the linear growth condition nor the continuous condition on the time t. Two examples are provided to show the effectiveness of the theoretical results. | XU DaoYi WANG XiaoHu YANG ZhiGuo | 2013 | Science China Mathematics2013，56，6： | 8 |
| 10 | Grey systems for intelligent sensors and information processing显示文摘In a measurement system,new representation methods are necessary to maintain the uncertainty and to supply more powerful ability for reasoning and transformation between numerical system and symbolic system.A grey measurement system is discussed from the point of view of intelligent sensors and incomplete information processing compared with a numerical and symbolized measurement system.The methods of grey representation and information processing are proposed for data collection and reasoning.As a case study,multi-ultrasonic sensor systems are demonstrated to verify the effectiveness of the proposed methods. | Chen Chunlin Dong Daoyi Chen Zonghai Wang Haibo | 2008 | Journal of Systems Engineering and Electronics2008，19，4： | 7 |
| 11 | Atmospheric oscillations over the last millennium显示文摘The variations of global atmospheric oscillations over the last millennium, including the North Atlantic Oscillation (NAO), the North Pacific Oscillation (NPO) highly associated with the Pacific Decadal Oscillation (PDO), the Southern Oscillation (SO) and the Antarctic Oscillation (AAO), are studied and compared in this paper based on observations and reconstructed data. The cross correlation analysis of AAO, NAO and NPO shows that there is no significant relationship on interannual variation among them. However, the consistency on decadal variability is prominent. During A.D.1920–1940 and A.D.1980–2000, the positive (strong) phase was dominant and the negative (weak) one noticeable during A.D.1940–1980. In addition, the reconstructed atmospheric oscillations series demonstrate that the positive phase existed in the early of the last millennium for NAO and in the late of the last millennium for AAO, respectively; while it occurred in the mid-late of the last millennium for PDO and ENSO. | HUANG JianBin WANG ShaoWu GONG DaoYi ZHOU TianJun WEN XinYu ZHANG ZiYin ZHU JinHong | 2010 | Chinese Science Bulletin2010，55，22： | 6 |
| 12 | Reconstruction of the western Pacific warm pool SST since 1644 AD and its relation to precipitation over East China显示文摘Based on coral proxies we reconstructed the western Pacific warm pool sea surface temperature (SST) since 1644 AD. High-frequency reconstructions are based on eight high-pass filtered coral series and raw reconstructions are derived from eight unfiltered coral series, respectively. Validation and comparison with other SST/temperature series show that the reconstructed warm pool SST is highly reliable. The leading periods of warm pool SST are ~2.1, ~2.3, ~2.9, ~3.6, ~3.8, and 80.7-year during the last ~360 years. The warm pool SST exhibits some obvious long-term trends: an upward trend of 0.04℃ per century for the period of 1644―1825, while a decreasing trend of 0.24℃ per century for the period of 1826―1885, and then a remarkable warming trend of 0.28℃ per century taking place between 1886 and 2006. Especially, the SST shows the strongest trend of 0.67℃ increase per century during the last 50 years, a warming unprecedented since 1644 AD. On interannual timescale, the connections between ENSO and the warm pool SST are robust during the reconstruction period. There are significant corre- lations between the warm pool SST and summer precipitation of the Yellow River basin and Huaihe River basin; the correlation coefficients are -0.44 in reconstruction period (1880―1949 AD) and -0.46 in instrumental period (1950―2005 AD) respectively. This relationship is also found between flooddrought index and the warm pool SST during the past 360 years, and their correlation coefficients are -0.20 in reconstruction period and-0.46 in instrumental period respectively, significant at the 0.01 level. On interdecadal timescale, this connection is more robust, and the correlation coefficient of the low-pass filtered components is -0.42 during the whole period (1644―2000 AD). When the warm pool is warmer than normal, the precipitation is usually below the normal in the Yellow River and Huaihe River basin. On the contrary, when the warm pool is colder than the normal, there may be more precipitation. The reconstructed warm pool SSTs provide useful information and reference for further research on climate change mechanism in East China. | ZHANG ZiYin GONG DaoYi HE XueZhao GUO Dong FENG ShengHui | 2009 | Science China Earth Sciences2009，52，9： | 3 |
| 13 | Some Evidence for a Possible Extraterrestrial Event at/near Permian-Triassic Boundary显示文摘A selection of evidence, including a carbon isotopic excursion, iridium anomaly, fullerenes (C 60 and C 70 ) with trapped noble gases, microspherules and shocked quartz, is discussed in this paper. All the evidence in hand favors the hypothesis that the PTB event was probably related to an extraterrestrial cause, and the impact would lead to great physical change, including large volcanic eruptions on the earth’s surface. The ET markers for the CTB event could be considered only as an example, and cannot be taken as a unique standard of an ET event. | Xu Daoyi Institute of Geology, China Seismological Bureau, Beijing 100029 | 2002 | Journal of China University of Geosciences2002，13，2： | 2 |
| 14 | Domain of attraction of nonlinear functional difference systems显示文摘The domain of attraction of nonlinear functional difference systems is studied. A sufficient condition for determining the domain of attraction is given based on a non-negative parameter matrix whose spectral radius ρis less than one and on the characteristic space associated with ρ. | Daoyi Xu Anshi Xu | 1999 | Chinese Science Bulletin1999，44，2： | 2 |
| 15 | Weekend effect in diurnal temperature range in China: Opposite signals between winter and summer显示文摘 | Gong Daoyi Dong Guo and Chang-Hoi Ho | 2006 | Journal of Geophysical Research2006，，： | 1 |
| 16 | Global exponential stability of impulsive dynamical systems with dis-tributed delays显示文摘 | Shujun Long Daoyi Xu and Wei Zhu | 2007 | Electronic Journal of Quanlitative Theory of Differential Equations2007，10，： | 1 |
| 17 | Global asymptotic stability of bidirectional associative memory neural networks with S-type dis-tributed delays显示文摘 | WANG Linshan XU Daoyi | 2002 | International Journal of Systems Science2002，33，11： | 1 |
| 18 | Functional superficial parotidetomy显示文摘 | Zhao Kun Qi Daoyi Wang Linming | 1994 | J Oral Maxillofac Surg1994，52，： | 1 |
| 19 | Vegetation water content estimation for corn and soybeans using spectral indices derived from MODIS near- and short-wave infrared bands显示文摘 | Daoyi Chen Jingfeng Huang Thomas J. Jackson | 2005 | Remote Sensing of Environment2005，，2： | 1 |
| 20 | Global exponential stability of Hopfield neural networks with reaction-diffusion and variable delay 显示文摘 | WANG Linshan XU Daoyi | 2003 | Science in China ( E )2003，3，6： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员