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Search Results: 1 - 10 of 17640 matches for " Ren Lang "
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Characteristics of EM scattering on dielectric fractal surface
Minxi Wang,Jing Li,Lang Ren
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882608
Abstract: In this note, the scattering field from the dielectric rough surface is investigated by using the fractal function. Parameters of the fractal function are changed to model the roughness of the surface under consideration. In this way, explicit expression of the scattering field from the rough surface in Kirchhoff approximation can be obtained and other different cases can be easily analysed. We can conclude that the fractal function is a fine tool for solving the problems of scattering from the rough surface. This note can provide the numerical bases for the inverse problems.
Characteristics of EM scattering on dielectric fractal surface

Minxi Wang,Jing Li,Lang Ren,

科学通报(英文版) , 1997,
Abstract: Conclusions In this note, the scattering field from the dielectric rough surface is investigated by using the fractal function. Parameters of the fractal function are changed to model the roughness of the surface under consideration. In this way, explicit expression of the scattering field from the rough surface in Kirchhoff approximation can be obtained and other different cases can be easily analysed. We can conclude that the fractal function is a fine tool for solving the problems of scattering from the rough surface. This note can provide the numerical bases for the inverse problems.
DIRECTIVITY OPTIMIZATION OF CURVED SURFACE DIPOLES
曲面偶极子方向性系数的优化

Wang Junhong,Ren Lang,
王均宏
,任朗

电子与信息学报 , 1994,
Abstract: Based on the calculation of the characteristic parameters of curved surface dipoles by moment method, the directivities are optimized, the maximum directivities of curved surface dipoles are obtained.
TWO-STEP S THOMPSON-FDTD METHOD
Thompson-FDTD方法中的两步法

Liao Cheng,Ren Lang,
廖成
,任朗

电子与信息学报 , 1998,
Abstract: This paper combines the differential-Thompson transformation involved in hydromechanics with the finite difference time domain (FDTD) technique to form Thompson-FDTD method. This method is applied for the first time to calculate the electromagnetic scattering properties of arbitrarily shaped dielectric objects. This method has at least two obvious advantages: it can transform arbitrary shaped bodies into regular structures and thus the boundary conditions are matched accurately; it can wilfully dispose the grid distribution and thus better numerical accuracy is achieved. The numerical simulation further confirms its validity.
Dynamical decoupling based quantum sensing: Floquet spectroscopy
J. E. Lang,Ren-Bao Liu,T. S. Monteiro
Physics , 2015, DOI: 10.1103/PhysRevX.5.041016
Abstract: Sensing the internal dynamics of individual nuclear spins or clusters of nuclear spins has recently become possible by observing the coherence decay of a nearby electronic spin: the weak magnetic noise is amplified by a periodic, multi-pulse decoupling sequence. However, it remains challenging to robustly infer underlying atomic-scale structure from decoherence traces in all but the simplest cases. We introduce Floquet spectroscopy as a versatile paradigm for analysis of these experiments, and argue it offers a number of general advantages. In particular, this technique generalises to more complex situations, offering physical insight in regimes of many-body dynamics, strong coupling and pulses of finite duration. As there is no requirement for resonant driving, the proposed spectroscopic approach permits physical interpretation of striking, but overlooked, coherence decay features in terms of the form of the avoided crossings of the underlying quasienergy eigenspectrum. This is exemplified by a set of "diamond" shaped features arising for transverse-field scans in the case of single-spin sensing by NV-centers in diamond. We investigate also applications for donors in silicon showing that the resulting tunable interaction strengths offer highly promising future sensors.
Induction of seed germination in Orobanche spp. by extracts of traditional Chinese medicinal herbs
YongQing Ma,Wei Zhang,ShuQi Dong,XiangXiang Ren,Yu An,Ming Lang
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4302-2
Abstract: The co-evolution of Orobanche spp. and their hosts within the same environment has resulted in a high degree of adaptation and effective parasitism whereby the host releases parasite germination stimulants, which are likely to be unstable in the soil. Our objective was to investigate whether extracts from non-host plants, specifically, Chinese medicinal plants, could stimulate germination of Orobanche spp. Samples of 606 Chinese medicinal herb species were extracted with deionized water and methanol. The extracts were used to induce germination of three Orobanche species; Orobanche minor, Orobanche cumana, and Orobanche aegyptiaca. O. minor exhibited a wide range of germination responses to the various herbal extracts. O. cumana and O. aegyptiaca exhibited an intermediate germination response to the herbal extracts. O. minor, which has a narrow host spectrum, showed higher germination rates in response to different herbal extracts compared with those of O. cumana and O. aegyptiaca, which have a broader host spectrum. Methanolic extracts of many Chinese herbal species effectively stimulated seed germination among the Orobanche spp., even though they were not the typical hosts. The effective herbs represent interesting examples of potential trap crops. Different countries can also screen extracts from indigenous herbaceous plants for their ability to induce germination of Orobanche spp. seeds. The use of such species as trap plants could diminish the global soil seed bank of Orobanche.
MAGNETOCRYSTALLINE ANISOTROPY OF BaZn2(GeMn)0.2Fe15.6O27 HEXAFERRITES
BaZn2(GeMn)0.2Fe15.6O27六角铁氧体的磁晶各向异性

FENG QUAN-YUAN,REN LANG,
冯全源
,任朗

物理学报 , 2000,
Abstract: 用标准陶瓷工艺制备了BaZn2(GeMn)0-2Fe15-6O27六角铁氧体.假设Ge4+取代了4e和4fⅣ中的Fe3+,能够很好地解释实验结果.利用分子场理论和H.B.Callen单离子各向异性模型计算了BaZn2(GeMn)0-2Fe15-6O27次点阵之间的交换参数和各次点阵对磁晶各向异性的贡献,并对实验结果进行了拟合.结果表明,12k和2d次点阵对磁晶各向异性有较大的贡献
Phase Shifter Materials with Zn Ti Sn-subtituted Lithium Ferrites
移相器材料Zn、Ti、Sn替代锂铁氧体

FENG Quan-Yuan,CHEN Wei,REN Lang,
冯全源
,陈伟,任朗

无机材料学报 , 2000,
Abstract: For Studying higy-property phase shifter materials in a phase axray antenna of autotrack synchronous communication satellites, lithium ferrite Li0.625Zn0.1Ti0.25Sn0.1Fe1.925O4 was prepared by using a standard ceramic flowing oxygen sifitering technique and adding some benificial materials such as MnCO3, Bi2O3 etc. The microwave properties of ferrite phase shifter materlals Li0.5(1-y)ZnyFe2.5(1-0.2,)O4 were discussed. The measured results show that lithium ferrite Li0.625Zn0.1Ti0.25Sn0.1Fe1.925O4 possesses high Curie temperature and low dielectric loss.
A PRELIMINARY STUDY OF THE PLANT RESIDUES IN PEAT AND THE CLASSIFICATION OF MINERAL BODIES OF PEAT
植物残体与泥炭和泥炭矿体分类的初步探讨

Lang Hui-qing Jin Shu-ren,
郎惠卿
,金树仁

植物生态学报 , 1986,
Abstract: Plant residues are the main component of peat and its mineral bodies. The composition of plants in the peat has close relations with the decomposition degree and the nutrition status of peat. The composition of plant residues is an important basis for making the classification of peat. The mineral bodies of peat in China are now tentatively divided into 11 groups of 4 types, which are classified according to the principle of taxonomy by the features of these mineral bodies and their qualitative differences, and on the basis of the components of the plant residues in the mineral layers.
EXTRACTION OF THE NATURAL FREQUENCIES OF A RADAR TARGET BY DUAL SPACE THEORY
提取自然频率问题的对偶解法和连续化Prony法

Li Jing,Wang Wenbing,Ren Lang,
李敬
,任朗,汪文秉

电子与信息学报 , 1992,
Abstract: The dual space theory is introduced for extracting the natural frequencies of a radar target from a measured response. The theory not only contains Prony method,SVD method and E pulse method, but also gives a new scheme-the Combination Operation(CO) method, which is shown to be more insensitive to random noise and to estimation of modal contents. Verification of the CO mehtod is accomplished by comparing the numerical results with those of the other three methods. The applicability of CO method to a conducting sphere is also demonstrated.
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