检索结果-南通市图书馆

Molecular Plant 2012年第1期5卷 85-97页

作者： nan-nan gu Yan-Chun Zhang Hong-Quan Yang National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and EcologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200032China Plant Science Institute School of Agriculture and BiologyShanghai Jiaotong UniversityShanghai 200240China

CRYPTOCHROMES （CRYs） are photolyase-like ultraviolet-A/blue light photoreceptors that mediate various light responses in plants. The signaling mechanism of Arabidopsis CRYs （CRY1 and CRY2） involves direct CRY-COP1 interaction. Here, we report that CRY1G380R, which carries a Gly-to-Arg substitution of the highly conserved G380 in the photo-lyase-related （PHR） domain of Arabidopsis CRY1, shows constitutive CRY1 photoreceptor activity in Arabidopsis. Transgenic plants overexpressing CRY1G380R display a constitutively photomorphogenic （COP） phenotype in darkness, as well as a dramatic early flowering phenotype under short-day light conditions （SD）. We further demonstrate that CRY1G380R expression driven by the native CRY1 promoter also results in a COP phenotype in darkness. Moreover, over- expression of either the Arabidopsis homolog CRY2G377R or the rice ortholog OsCRYlbG388R of CRY1G380R in Arabidopsis results in a COP phenotype in darkness. Cellular localization studies indicate that CRY1G380R co-localizes with COP1 in the same nuclear bodies （NBs） in vivo and inhibits the nuclear accumulation of COP1 in darkness. These results suggest that the conserved G380 may play a critical role in regulating the photoreceptor activity of plant CRYs and that CRY1G380R might constitutively phenocopy the photo-activated CRY1 in darkness and thus constitutively mediate CRY1 signaling.

关键词： Arabidopsis CRY1 CRy1G380R COP phenotype COP1.

Safety-Critical Game-Based Formation Control of Underactuated Autonomous Surface Vehicles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2023年第4期10卷 1102-1104页

作者： nan gu Haoliang Wang Anqing Wang Lu Liu School of Marine Electrical Engineering Dalian Maritime UniversityDalian 116026 School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourne VIC 3122Australia School of Marine Engineering Dalian Maritime UniversityDalian 116026China School of Marine Electrical Engineering Dalian Maritime UniversityDalian 116026China

Dear Editor,This letter addresses the noncooperative formation control of multiple underactuated autonomous surface vehicles (ASVs) in an obstacle-laden *** ASV is subject to external disturbances and fully unknown model parameters.A safety-critical game-based formation control method is proposed such that the multiple AS Vs are able to track a reference trajectory,and accomplish each individual interest in safety behaviors *** stability and safety analyses show that the closed-loop system is input-to-state stable (ISS),and the multi-ASV system is guaranteed for input-to-state safety (ISSf).Simulation results substantiate the proposed safety-critical game-based formation control method.

关键词： method system letter

Study of the relationship between the content of the rare earth element Eu in rice plants and in Nilaparvata lugens （Hemiptera： Delphacidae）

在线全文

学校读者我要写书评

暂无评论

Insect Science 2012年第1期19卷 13-20页

作者： Min Yang Jin-Cai Wu Hai-nan gu School of Plant Protection Yangzhou UniversityYangzhouChina Indooroopilly Science Centre Department of Primary Industries and FisheriesQueensland 4068Australia

The current study investigated changes in the content of the rare earth element Europium （Eu） in roots, shoots and leaves of rice plants and in Nilaparvata lugens Stal （Hemiptera： Delphacidae） using an Eu marker and hydroponic culture. The results showed that N. lugens infestation significantly reduced Eu content in roots, shoots and leaves of two rice varieties, Shenyou 1 and Xieyou 963. The Eu content in roots, shoots and leaves of the susceptible variety, Shenyou 1, was significantly higher than that in the resistant variety, Xieyou 963. The Eu content ofN. lugens fed on Shenyou 1 was significantly higher than of those fed on Xieyou 963. In addition, the Eu level was elevated at a higher density ofN. lugens infestation. Eu content in the bodies ofN. lugens was related to their weight and honeydew excretion, with a significant positive correlation. Thus, Eu content in the bodies ofN. lugens can be considered an index of the amount of phloem sap taken in by N. lugens because the amount of honeydew excretion is proportional to the amount of phloem sap consumed. The ratios of Eu content in N. lugens to that in roots, shoots and leaves of rice plants were elevated at a higher N. lugens infestation density. That ratio was maximal in leaves, was intermediate in shoots and was minimal in roots. There was no significant difference in ratios between the two plant varieties. An Eu marker may be useful in the screening of resistant varieties and in the study of the mechanisms of resistance.

关键词： markers Nilaparvata lugens rare earth element Eu rice

Multi-ASV Collision Avoidance for Point-to-Point Transitions Based on Heading-Constrained Control Barrier Functions With Experiment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2023年第6期10卷 1494-1497页

作者： Yanping Xu Lu Liu nan gu Dan Wang Zhouhua Peng the School of Marine Electrical Engineering Dalian Maritime UniversityDalian 116026China

Dear Editor, Collision avoidance is critical for safe operations of multiple autonomous surface vehicles(ASVs). It is a challenging task to design collision-free control laws to ensure safety, especially in a crowded sea environment. This letter presents a collision-free pointto-point transition strategy for multiple ASVs subject to static obstacles, dynamic obstacles and neighboring ASVs based on control barrier functions(CBFs).

关键词： collision Transition obstacles

Study of image reconstruction using dynamic grids in tomographic gamma scanning

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2012年第5期23卷 277-283页

作者： LIU Cheng gu Weiguo QIAN nan WANG Dezhong School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China

In this paper, a new image reconstruction algorithm employing dynamic grids technique is proposed for tomographic gamma scanning. The key feature of the algorithm is the use of adaptive grid refinement in areas that indicate large values. Simulation results show that the application of dynamic grids has a good performance in emission reconstruction with a distinct advantage in the accurate positioning of the 'hot spots' and reducing the number of grids, but doesn't achieve a tangible improvement in transmission reconstruction.

关键词：层析γ扫描动态网格图像重建网格技术网格细化仿真结果准确定位自适应

Single molecule electro-catalysis of non-fluorescent molecule

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第12期26卷 1514-1517页

作者： Fei-Fei Li Jun-nan gu Xiao-Chun Zhou Division of Advanced nanomaterials Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences

Single molecule catalysis is very powerful in revealing catalytic mechanism at the single molecule *** fluorescent molecule is always necessary to take part into the catalysis directly in previous *** order to study the single molecule electro-catalysis of non-fluorescent molecule（SMECNFM） on nanocatalyst, we couple the SMECNFM with a single molecule fluorescence reaction. A certain number of fluorescent molecules will be generated and detected when the SMECNFM happens. Through this method, we can detect the electro-oxidation reaction of one HCOONa molecule. The stability of Pt nanocatalyst supported on active carbon is studied at the single molecule level by this method. This paper also provides a general way to make ultra-sensitive sensor, and to study the SMECNFM for the molecules,such as formic acid, hydrogen, oxygen, etc., on single nanoparticle.

关键词： catalysis powerful reactant silica stoichiometric detecting camera slide redox revealing

Magnesium based degradable biomaterials： A review

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2014年第3期8卷 200-218页

作者： Xue-nan gu Shuang-Shuang LI Xiao-Ming LI Yu-Bo FAN Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100191 China

Magnesium has been suggested as a revolutionary biodegradable metal for biomedical applications. The corrosion of magnesium, however, is too rapid to match the rates of tissue healing and, additionally, exhibits the localized corrosion mechanism. Thus it is necessary to control the corrosion behaviors of magnesium for their practical use. This paper comprehensively reviews the research progress on the development of representative magnesium based alloys, including Mg-Ca, Mg-Sr, Mg-Zn and Mg-REE alloy systems as well as the bulk metallic glass. The influence of alloying element on their microstructures, mechanical properties and corrosion behaviors is summarized. The mechanical and corrosion properties of wrought magnesium alloys are also discussed in comparison with those of cast alloys. Furthermore, this review also covers research carried out in the field of the degradable coatings on magnesium alloys for biomedical applications. Calcium phosphate and biodegradable polymer coatings are discussed based on different preparation techniques used. We also compare the effect of different coatings on the corrosion behaviors of magnesium alloys substrate.

关键词： magnesium alloy degradable biomaterial coating degradation corrosion

A New Method to Remove Neutral Template in the Synthesis of HMS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第3期12卷 275-278页

作者： Qing Min ZHANG Yan LI Fu Zhi HUANG Zhen nan gu Department of Materials Chemistry Peking UniversityBeijing 100871

In the synthesis of HMS, Soxhlet extraction as a new method to remove neutral template was studied. HREM image, X-ray diffraction patterns and nitrogen adsorption-desorption results verified that this method can not only efficiently remove and recover the template, but also benefit the maintenance of the mesoporous framework structure.

关键词： Soxhlet extraction HMS After-treatment

Adaptive line-of-sight guidance law for synchronized path-following of under-actuated unmanned surface vehicles based on low-frequency learning 36

在线全文

学校读者我要写书评

暂无评论

Adaptive line-of-sight guidance law for synchronized path-fo...

The Luminescence Properties of M' type of YTaO_4∶Eu

第36届中国控制会议

作者： nan gu Dan Wang Lu Liu Bin Zhang Zhouhua Peng School of Marine Engineering Dalian Maritime University Department of Computer Science City University of Hong Kong

ISBN: (纸本)9781538629185

This paper presents a guidance law design for synchronized path-following of multiple under-actuated unmanned surface vehicles（USVs） in the presence of unknown *** sideslip can be caused by wind,waves,and ocean currents,or arise when following a curved *** adaptive guidance law is proposed based on a line-of-sight（LOS） guidance principle and a low-frequency learning *** using this guidance law,the undesired high-frequency transients existing in classical adaptive LOS guidance law can be eliminated,and aggressive maneuvers for USVs can be *** global uniform asymptotic stable（guAS） of closed-loop guidance system is *** results are given to demonstrate the effectiveness of the proposed adaptive guidance law for synchronized path-following.

关键词： guidance law synchronized path-following under-actuated unmanned surface vehicles low-frequency learning

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1999年第3期15卷 226-231页

作者： LI Bo gu Zhen-nan DONG Yi LIN Jian-hua SU Mian-zeng Chemistry Department State key Laboratory of Rare Earth Materials Chemistry and ApplicationsPeking UniversityBejing 100871P.R.China

A series of Eu 3+ doped of Mtype of yttrium orthotantalate Y 1-x Eu x TaO 4( x =0-0.30) was sythesized. The influence of activator concentration on luminescence properties was studied in detail. The strong evidence from excitation spectra, emission spectra and diffusive reflection spectra of this system shows that there is energy transfer from TaO 3- 4 to Eu 3+ via the charge transfer and spectral overlap.

关键词： Tantalate Rare earth Luminescence