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Search Results: 1 - 10 of 107301 matches for " HE Chen-Xia "
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Recent Advances in Gene Transformation of Monocotyledons Mediated by Agrobacterium Tumefaciens
农杆菌介导单子叶植物基因转化研究进展

HE Chen-Xia,XIA Guang-Min,
贺晨霞
,夏光敏

植物学报 , 1999,
Abstract: The transformation system mediated by Agrobacterium tumefaciens is a kind of common and efficient means for gene transformation of dicotyledons. The advantages of this system have aroused much attention. This method is used recently to transform monocotyledons which have been considered out of the range of Agrobacteria hosts. Many important crops such as rice, corn, barley and wheat have been transformed successfully by Agrobacterium. This article summarizes the advantages of Agrobacteria transformation, the mechanism of transformation and research advances on monocotyledons.
Adaptable mobile transaction model based on weight in mobile computing
移动计算中基于权值的自适应事务处理模型

LI Zhi-chao,QIE Chen-xia,HE Tao,
李智超
,吕晓峰,郄晨霞,何涛

计算机应用 , 2007,
Abstract: Mobile transaction model is one of the key technologies.Based on the analysis of the present transaction models,this paper proposed an adaptable mobile transaction model based on weight,which can itself choose sub-transaction model according to the transaction's network and whether the transaction visits the hot data.The results of experiment show that new model has better performance at mobile transaction redo ratio and executing time than other models.
Edge detection method based on mathematical morphology and canny algorithm
基于数学形态学和Canny算子的边缘提取方法

HE Xin-ying,WANG Jia-zhong,SUN Chen-xia,CHANG Shu-hui,ZHOU Gui-hong,
何新英
,王家忠,孙晨霞,常淑惠,周桂红

计算机应用 , 2008,
Abstract: A new edge detection method was put forward based on mathematical morphology and Canny algorithm. The background of the image was estimated by morphological opening and then calculated together with the original image by geometric operations. Finally, the Canny edge detection algorithm was applied to the processed image. The experimental results show that the proposed approach is obviously superior to the traditional Canny edge detection method with median filter, and provides good foundation for feature extraction and object recognition.
Ethyl 7-(2-chlorophenyl)-5-trifluoromethyl-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidine-6-carboxylate
Jie Mou,Chen-Xia Yu,Chang-Sheng Yao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810037712
Abstract: In the title compound, C15H12ClF3N4O2, the dihydropyrimidine ring exhibits an envelope conformation. The dihedral angle between the mean planes of the dihydropyrimidine and phenyl rings is 83.94 (6)°. The OCH2CH3 group is disordered over two sites with occupancies of 0.155 (3) and 0.845 (3). The crystal packing is stabilized by intermolecular N—H...N hydrogen bonds.
Gain-Programmed Amplifier Based on AD8402 Digital Potentiometer
基于数字电位器AD8402的程控增益系统

LIU Chen-xia,FU Yu-tian,
刘晨霞
,傅雨田

红外 , 2007,
Abstract: After Comparing some other architectures of different digital potentiometers, a gainprogrammed amplifier based on an AD8402 digital potentiometer which can set offset voltage is presented. The hardware principle and software design of this method are described and some notices for using AD8402 are given. The gain-programmed amplifier has a simple hardware architecture , high quality, low price and widespread availability.
Generalized hierarchical hybrid fuzzy system and its universal approximation
广义分层混合模糊系统及其泛逼近性

WANG Gui-jun,DUAN Chen-xia,
王贵君
,段晨霞

控制理论与应用 , 2012,
Abstract: To avoid the rule-explosion in the fuzzy system, we introduce a real-number and unify the Mamdani fuzzy system and the T--S fuzzy system to build a generalized hierarchical hybrid fuzzy system, and derive its mathematical representation. Because of the good properties of square-piecewise linear functions, this type of fuzzy system still possesses the universal approximation ability in the sense of integral norm. Simulation in an example shows that the generalized hierarchical hybrid fuzzy system can avoid the rule-explosion problem.
Compact Dual-Mode Filter Using Meander Shorted Stub Loaded Resonators
Chen-Xia Sun;Li-Ying Feng;Xin-Yue Liu;Hong-Xing Zheng
PIER Letters , 2012, DOI: 10.2528/PIERL12012506
Abstract: To reduce the size and improve the performance, a 4th-order miniaturized dual-mode microstrip bandpass filter (BPF) is developed. A meander shorted stub loaded resonator is used, and much compact size is obtained. Theoretical model is set up, and the odd and even modes of the BPF are analyzed based on a symmetrical structure. Full wave simulation validates the design method. To verify the design, a fabricated BPF sample has been tested. Experiment result demonstrates that the designed BPF has wider stopband and better selectivity. Its fractional bandwidth and a center frequency are available.
5-Amino-7-(4-bromophenyl)-3,7-dihydro-2H-thieno[3,2-b]pyran-6-carbonitrile 1,1-dioxide
Chen-Xia Yu,Xiao-Dong Feng,Bei Jiang,Cui-Hua Wang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536809055214
Abstract: In the title compound, C14H11BrN2O3S, the 2,3-dihydrothiophene ring is almost planar [maximum deviation = 0.006 (1) ]. The pyran ring is in an envelope conformation [puckering parameters Q = 0.115 (2) , θ = 77.5 (10), = 172.9 (10)°]. The pyran and phenyl rings are approximately perpendicular, making a dihedral angle of 76.4 (2)°. The crystal packing is stabilized by intermolecular N—H...O hydrogen bonds, with the sulfone O atoms acting as acceptors.
3-Ethyl 5-methyl 2-hydroxy-6-methyl-4-(4-nitrophenyl)-2-trifluoromethyl-1,2,3,4-tetrahydropyridine-3,5-dicarboxylate
Chen-Xia Yu,Pei-Li Qian,Jia-Jing Ping,Chang-Sheng Yao
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808024835
Abstract: In the title compound, C18H19F3N2O7, the tetrahydropyridine ring adopts a half-chair conformation. The nitro group is disordered over two sites with occupancies of 0.780 (15) and 0.220 (15). An intramolecular N—H...F hydrogen bond is observed in the molecular structure. The molecules are linked into a two-dimensional network parallel to (100) by O—H...O, N—H...O and C—H...O hydrogen bonds.
Entropy of a general spherically symmetric and charged evaporating black hole
一般球对称带电蒸发黑洞的熵

Song Tai-Peng,Hou Chen-Xia,Huang Jin-Shu,
宋太平
,侯晨霞,黄金书

物理学报 , 2002,
Abstract: Starting from the null surface equation, we obtain the event horizon of a general spherically symmetric and charged evaporating black hole. Using Klein Gordon equation, thin film brick wall model and WKB approximation, we obtain the entropy of a general spherically symmetric and charged evaporating black hole. This entropy is proportional to the area of event horizon.
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