检索结果-南通市图书馆

OPTIMAL BINARY CODES FROM ONE-LEE WEIGHT CODES AND TWO-LEE WEIGHT PROJECTIVE CODES OVER z_4

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

Journal of Systems Science & Complexity 2014年第4期27卷 795-810页

作者： SHI Minjia Wang yu School of Mathematical Sciences Anhui University Department of Mathematics and Physics Hefei University

This paper investigates the structures and properties of one-Lee weight codes and two-Lee weight projective codes over *** authors first give the Pless identities on the Lee weight of linear codes over z_*** the authors study the necessary conditions for linear codes to have one-Lee weight and two-Lee projective weight respectively,the construction methods of one-Lee weight and two-Lee weight projective codes over z4 are also ***,the authors recall the weight-preserving Gray map from(z_4~n,Lee weight)to(F_2^(2n),Hamming weight),and produce a family of binary optimal oneweight linear codes and a family of optimal binary two-weight projective linear codes,which reach the Plotkin bound and the Griesmer bound.

关键词： Gray map Lee weight one-weight codes projective codes two-weight codes.

Novel schemes to generate multi-level modulation formats for ultra-capacity coherent detection transmission systems

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第9期8卷 823-830页

作者： Jianjun yu Xiang zhou zTE USA Inc. Iselin NJ 08830 USA and also with ZTE Inc. Beijing 100876 China AT&T Labs-Research Middletown NJ 07748 USA

We summarize several novel schemes to generate multi-level modulation formats for high capacity transmission system with high spectral efficiency. We show that multi-level 8QAM, 16QAM, 32QAM, and 64QAM （QAM： quatlrature amplitude modulation） optical signals can be generated by commercial optical and electrical devices. Employing these multilevel modulation formats, we have realized PDM-8QAM （PDM： polarization division multiplexing） 32 Tb/s and PDM-36QAM 64-Tb/s signals transmission over 580-and 320-km fibers, respectively.

关键词： Spectrum analyzers

BACKWARD STOCHASTIC VIABILITY AND RELATED PROPERTIES ON z FOR BSDES WITH APPLICATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2012年第4期25卷 675-690页

作者： zhen WU zhiyong yu School of Mathematics Shandong University School of Economics Shandong University

This paper investigates some important properties of z, the martingale integrant of the backward stochastic differential equations, which is the second process of the solution. These include the backward stochastic viability property, bounded property and the comparison theorem. To explain the theoretical results, the authors apply them to study a financial contingent claim pricing problem. The replication portfolio process can be characterized clearly.

关键词： Backward stochastic differential equations backward stochastic viability property Malliavin calculus portfolio choice.

A Hybrid Procedure for Finding Real Points on a Real Algebraic Set

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2019年第1期32卷 185-204页

作者： Wang yu XIA Bican LMAM & School of Mathematical Sciences Peking University

Motivated by the idea of Shen, et al.'s work, which proposed a hybrid procedure for real root isolation of polynomial equations based on homotopy continuation methods and interval analysis,this paper presents a hybrid procedure to compute sample points on each connected component of a real algebraic set by combining a special homotopy method and interval analysis with a better estimate on initial intervals. For a real algebraic set given by a polynomial system, the new method ?rst constructs a square polynomial system which represents the sample points, and then solve this system by a special homotopy continuation method introduced recently by Wang, et al.(2017). For each root returned by the homotopy continuation method, which is a complex approximation of some(complex/real) root of the polynomial system, interval analysis is used to verify whether it is an approximation of a real root and ?nally get real points on the given real algebraic set. A new estimate on initial intervals is presented which helps compute smaller initial intervals before performing interval iteration and thus saves computation. Experiments show that the new method works pretty well on tested examples.

关键词： Homotopy continuation interval arithmetic polynomial system real variety

A flow control mechanism in wing flapping with stroke asymmetry during insect forward flight

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2005年第3期21卷 218-227页

作者： Yongliang yu Binggang Tong Department of Physics Graduate School of the Chinese Academy of Sciences Beijing 100039 China Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

A theoretical modeling approach as well as an unsteady analytical method is used to study aerodynamic characteristics of wing flapping with asymmetric stroke-cycles in connection with an oblique stroke plane during insect forward flight. It is revealed that the aerodynamic asymmetry between the downstroke and the upstroke due to stroke-asymmetrical flapping is a key to understand the flow physics of generation and modulation of the lift and the thrust. Predicted results for examples of given kinematics validate more specifically some viewpoints that the wing lift is more easily produced when the forward speed is higher and the thrust is harder, and the lift and the thrust are generated mainly during downstroke and upstroke, respectively. The effects of three controlling parameters, i.e. the angles of tilted stroke plane, the different downstroke duration ratios, and the different angles of attack in both down- and up-stroke, are further discussed. It is found that larger oblique angles of stroke planes generate larger thrust but smaller lift; larger downstroke duration ratios lead to larger thrust, while making little change in lift and input aerodynamic power; and again, a small increase of the angle of attack in downstroke or upstroke may cause remarkable changes in aerodynamic performance in the relevant stroke.

关键词： Insect forward flight Wing flapping Stroke asymmetry Oblique stroke plane Theoretical modeling.

Observation and Simulation of n=1 Reversed Shear Alfvén Eigenmode on the HL-2A Tokamak

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第10期39卷 26-33页

作者： P.W.Shi Y.R.Yang W.Chen z.B.Shi z.C.Yang L.M.yu T.B.Wang X.X.He X.Q.Ji W.L.zhong M.Xu X.R.Duan Southwestern Institute of Physics Chengdu 610041China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China

A branch of high-frequency Alfvenic modes is observed on the HL-2A *** electromagnetic mode can be driven unstably in the plasma with an off-axis neutral beam *** mode frequency keeps almost unchanged or presents a slow-sweeping behavior,depending on the detail current *** poloidal and toroidal mode numbers are𝑚m/n=1/*** mode has a quite short duration(≤20 ms)and usually appears 5-10 ms after the neutral beam being injected into the *** simulations based on M3D-K have also been carried *** result suggests that co-passing energetic particles are responsible for the mode *** simulated mode structures are localized nearby location of minimum safety factor(q_(min))and agree with the structures obtained through tomography of soft x-ray ***,the modes are localized in the continuum gap and their frequencies increase with variation of𝑞min in a wide *** but not least,the characteristic of unchanged frequency on experiment is also reproduced by the nonlinear simulation with a fixed safety *** those evidences indicate that the𝑛n=1 high-frequency mode may belong to a reversed shear Alfven eigenmode.

关键词： Alfven mode unchanged

Effect of ion-beam assisted deposition on the film stresses of TiO_2 and SiO_2 and stress control

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第5期28卷 1382-1388页

作者： yu-Qiong Li Hua-Qing Wang Wu-yu Wang zhi-Nong yu He-Shan Liu Gang Jin National Microgravity Laboratory(NML) Institute of MechanicsChinese Academy of Sciences School of Optoelectronics Beijing Institute of Technology Optical Thin Film Center Daheng New Epoch Technology Inc. Beijing General Research Institute for Nonferrous Metals Division of Mineral Research and Material Energy

Based on Hartmann-Shack sensor technique, an online thin film stress measuring system was introduced to measure the film stresses of TiO2 and SiO2, and comparison was made between the film stresses prepared respectively by the conventional process and the ion-beam assisted deposition. The effect of ion-beam assisted deposition on the film stresses of TiO2 and SiO2 was investigated in details, and the stress control methodologies using on-line adjustment and film doping were put forward. The results show that the film stress value of TiO2 prepared by ion-beam assisted deposition is 40 MPa lower than that prepared by conventional process, and the stress of TiO2 film changes gradually from tensile stress into compressive stress with increasing ion energy; while the film stress of SiO2 is a tensile stress under ion-beam assisted deposition because of the ion-beam sputtering effect, and the film refractive index decreases with increasing ion energy. A dynamic film stress control can be achieved through in-situ adjustment of the processing parameters based on the online film stress measuring technique, and the intrinsic stress of film can be effectively changed through film doping.

关键词： Film stress Stress controlling Ion-beam as-sisted deposition Hartmann-Shack sensor

L^(p)-Estimate for Linear Forward-Backward Stochastic Differential Equations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第5期39卷 827-845页

作者： Bing XIE zhi Yong yu School of Mathematics Shandong UniversityJinan 250100P.R.China

This paper is concerned with coupled linear forward-backward stochastic differential equations(FBSDEs,for short).When the homogeneous coefficients are deterministic(the non-homogeneous coefficients can be random),we obtain an L^(P)-result(p>2),including the existence and uniqueness of the p-th power integrable solution,a p-th power estimate,and a related continuous dependence property of the solution on the coefficients,for coupled linear FBSDEs in the monotonicity framework over large time *** order to get rid of the stubborn constraint commonly existing in the literature,i.e.,the Lipschitz constant of σ with respect to z is very small,we introduce a linear transformation to overcome the difficulty on small intervals,and then"splice"the L^(P)-results obtained on many small intervals to yield the desired one on a large interval.

关键词： Forward-backward stochastic differential equation L^(P)-estimate monotonicity condition large interval

同方期刊数据库

Whole-Brain Map of Long-Range Monosynaptic Inputs to Different Cell Types in the Amygdala of the Mouse

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2020年第11期36卷 1381-1394页

作者： Jia-yu Fu Xiao-Dan yu Yi zhu Shi-ze Xie Meng-yu Tang Bin yu Xiao-Ming Li Center for Neuroscience and Department of Neurology of Second Affiliated Hospital Zhejiang University School of MedicineHangzhou 310058China NHC and CAMS Key Laboratory of Medical Neurobiology Center for Brain Science and Brain-Inspired IntelligenceGuangdong-Hong Kong-Macao Greater Bay AreaJoint Institute for Genetics and Genome Medicine between Zhejiang University and University of TorontoHangzhou 310058China

The amygdala,which is involved in various behaviors and emotions,is reported to connect with the whole ***,the long-range inputs of distinct cell types have not yet been ***,we used a retrograde trans-synaptic rabies virus to generate a whole-brain map of inputs to the main cell types in the mouse *** identified 37 individual regions that projected to neurons expressing vesicular glutamate transporter 2,78 regions to parvalbumin-expressing neurons,104 regions to neurons expressing protein kinase C-δ,and 89 regions to somatostatin-expressing *** amygdala received massive projections from the isocortex and *** nuclei,such as the caudate-putamen and the CA1 field of the hippocampus,exhibited input preferences to different cell types in the ***,we identified several novel input areas,including the substantia innominata and zona *** findings provide anatomical evidence to help understand the precise connections and diverse functions of the amygdala.

关键词： Basolateral amygdala Central amygdala Rabies virus retrograde tracing Glutamatergic GABAergic Mouse