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Search Results: 1 - 10 of 63718 matches for " YE Xiao-Xin "
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Advances in Alzheimer’s disease (AAD): Standing firm at its first anniversary  [PDF]
Xiao-Xin Yan
Advances in Alzheimer's Disease (AAD) , 2013, DOI: 10.4236/aad.2013.22006
Abstract: Editorial: Advances in Alzheimer’s disease (AAD): Standing firm at its first anniversary
On the reciprocal degree distance of graphs with cut vertices or edges
Xiao-Xin Li
Mathematics , 2015,
Abstract: In this paper, the extremal graph with the maximum RRD-value among all the graphs of order n with given cut vertices or edges is characterized. In addition, an upper bounds on the reciprocal degree distance in terms of the number of cut edges is provided.
The single attosecond pulse generated by atom exposed to two-color combined laser field
原子在两色组合激光场中产生的单个阿秒脉冲

Ye Xiao-Liang,Zhou Xiao-Xin,Zhao Song-Feng,Li Peng-Cheng,
叶小亮
,周效信,赵松峰,李鹏程

物理学报 , 2009,
Abstract: 利用分裂算符法求解含时薛定谔方程,对一维氦原子处于红外场(IR)与紫外场(UV)组合的两色激光场中产生的高次谐波进行研究,分析了由高次谐波产生的阿秒脉冲的特征. 发现在组合场中可以通过增加红外场的强度,来缩短阿秒脉冲的宽度,通过调节组合场中两束激光的时间延迟,提高一个电子轨道对谐波的贡献,而抑制另一个电子轨道的贡献,从而得到低于100 as的单个脉冲.
Allelopathic effect of potato on Orabanche aegyptiaca Pers. seed germination
马铃薯对瓜列当种子萌发的化感作用研究

WANG Zhong,MA Yong-Qing,JIA Jin-Nan,DONG Shu-Qi,YE Xiao-Xin,
王 钟
,马永清,贾锦楠,董淑琦,叶晓馨

中国生态农业学报 , 2013,
Abstract: Orobanche aegyptiaca is a national-class quarantine species in China which is seriously harmful to melons and other economic crops. In this study, four commercial potato varieties ("Xiabodi", "Qingshu 168", "Jizhangshu No.5" and "Kexin No.1") were planted at a pot experiment, and their rhizosphere soils and plant organs (roots, stems and leaves) sampled at different growth stages (seedling, blossoming and tuber forming stages). Allelopathy potential of extracts (methanol and distilled water) of the above samples was measured in terms of germination rates of O. aegyptiaca seeds treated. The potatoes varieties with O. aegyptiaca seed high germination rates were chosen to prevent and kill off O. aegyptiaca seeds on croplands. The results showed that potato stimulated O. aegyptiaca germination, and the allelopathy potential differed with potato variety. The germination rates of O. aegyptiaca seeds treated with extracts of potato rhizosphere soil increased with potato growth. This suggested that potato secreted O. aegyptiaca germination stimulants at certain period of growth which in turn reduced O. aegyptiaca seed bank in the soil. At seedling stage of potato, the germination rate of O. aegyptiaca seeds treated with 10-fold diluted methanol extracts from potato roots was higher than those from the shoot system. Seeds treated with "Xiabodi" showed the highest germination rate (48.5%). At blossoming stage of potato, the germination rate of O. aegyptiaca seeds treated with 10-fold diluted methanol extracts from stems was highest, followed by those treated with root extracts and leaf extracts. Seeds treated with "Jizhangshu No.5" had the highest germination rate (33.0%). At tuber forming stage of potato, the germination rate of O. aegyptiaca seeds treated with 10-fold diluted methanol extracts from shoot system was higher than those from roots. Also seeds treated with "Xiabodi" gave the highest germination rate (51.2%). While the germination rate of O. aegyptiaca seeds treated with root extracts declined with increasing growth of potato, those treated with aerial part extract increased. This suggested that of O. aegyptiaca germination stimulants in potatoes gradually moved from the root to shoot system. The germination rate of O. aegyptiaca seeds induced by methanol extracts was higher than that induced by water extracts. In other words, methanol extracts had better effects as germination stimulants. Although artificially synthesized analogues had facilitated the germination of parasitic plant seeds, government protocols had limited their field application and dissemination. Other methods for controlling O. aegyptiaca seeds (e.g., artificial weeding, herbicide application, hybridization and transgenic method) for broomrape resistant cultivars had some disadvantages. Using potato to control O. aegyptiaca was therefore a promising strategy that not only reduced and eradicated parasitic weed seed deposition in soils, but also significantly reduced host broo
A Flexible Improvement for Ping-Pong Protocol
LIU Yu,HUA Sha&sup,WANG Xiao-Xin&sup,LI Yue&sup,YE Jun&sup,LI Jun,
刘玉
,华沙,王晓鑫,李玥,叶俊,李俊

中国物理快报 , 2006,
Abstract: A deterministic quantum communication protocol, called the ping-pong protocol, has been represented by Bostr m and Felbinger Phys. Rev. Lett. 89 (2002) 187902]. Based on an entangled pair of photons, it allows asymptotically secure key distribution and quasi-secure direct communication. However, it was concluded from our previous research that the experiment realization of this protocol requires two optic paths strictly equivalent for interferometry. Here we propose an improved protocol, which is more flexible and secure for conceivable applications. Its feasibility and security are also discussed.
THE STUDY OF STRUCTURE AND PROPERTIES OF SECOND ORDER NONLINEAR SYSTEMS POSSESSING ROTATION SYMMETRY
二阶旋转对称非线性系统的结构和性质的研究

XIE XIAO-XIN,
谢小信

系统科学与数学 , 1993,
Abstract: In this paper,the general stucture expression of second order normal systems with rotationsymmetry is given.And the stability,controllability and structural simplification of these sys-tems are investigated.
Theoretical calculation of photoionization cross sections of B-like ions: N2+, O3+ and F4+

Wang Guo-Li,Zhou Xiao-Xin,

中国物理 B , 2009,
Abstract: There can be found some notable discrepancies with regard to the resonance structures when R-matrix calculations from the Opacity Project and other sources are compared with recent absolute experimental measurements of Bizau et al Astron. Astrophts. 439 387 (2005)] for B-like ions N2+, O3+ and F4+. We performed close-coupling calculations based on the R-matrix formalism for the photoionizations of ions mentioned above both for the ground states and first excited states in the near threshold regions. The present results are compared with experimental ones given by Bizau et al and earlier theoretical ones. Excellent agreement is obtained between our theoretical results and the experimental photoionization cross sections. The present calculations show a significant improvement over the previous theoretical results.
SELF-MAGNETIC-FIELD-LIMITING CURRENT OF INTENSE RELATIVISTIC ELECTRON BEAM UNDER EXTERNALLY APPLIED MAGNETIC FIELD

LIU GUO-ZHI,SONG XIAO-XIN,

中国物理 B , 1998,
Abstract: The self-magnetic-field-limiting current of intense relat ivistic electron beam (IREB) without an externally applied magnetic field is reported and briefly commented in this paper. By using dynamic balance method the self-magnetic-field-limiting current of IREB under externally applied magnetic field is derived, showing that in this case it will increase. This result is obtained for the first time, so far as we know, and will be further tested by experiment.
High harmonic generation from periodic potentials driven by few-cycle laser pulses
Zhong Guan,Xiao-Xin Zhou,Xue-Bin Bian
Physics , 2015,
Abstract: We investigate the high harmonic generation (HHG) from solids by simulating the dynamics of a single active electron in periodic potentials. The corresponding time-dependent Schr\"odinger equations (TDSE) are solved numerically by using B-spline basis sets in coordinate space. The energy band structure and wave vectors can be directly retrived from the eigenfunctions. The harmonic spectra obtained agree well with the results simulated by TDSE in $k$ space using Bloch states and show a two-plateau structure. Both of the cutoff energies of the two plateaus in the harmonic spectrum scale linearly with the field strength. We also study HHG driven by intense few-cycle laser pulses and find that the cutoff energy of the harmonic spectrum is as sensitive to the changes of the carrier envelope phase, as to HHG from gas samples, which suggests recollision pictures in HHG as found by recent experiments (Nature {\bf 522}, 462 (2015)).
The Connectivity and the Harary Index of a Graph
Xiao-Xin Li,Yi-Zheng Fan
Mathematics , 2012, DOI: 10.1016/j.dam.2014.08.022
Abstract: The Harary index of a graph is defined as the sum of reciprocals of distances between all pairs of vertices of the graph. In this paper we provide an upper bound of the Harary index in terms of the vertex or edge connectivity of a graph. We characterize the unique graph with maximum Harary index among all graphs with given number of cut vertices or vertex connectivity or edge connectivity. In addition we also characterize the extremal graphs with the second maximum Harary index among the graphs with given vertex connectivity.
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