检索结果-南通市图书馆

All Good (Bad) Words Consisting of 5 Blocks

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第6期33卷 851-860页

作者： Jian xin wei School of Mathematics and Statistics Science Ludong University Yantai 264025 P. R. China

Generalized Fibonacci cube Qd（f）, introduced by Ilid, Klavzar and Rho, is the graph obtained from the hypercube Qd by removing all vertices that contain f as factor. A word f is good if Qd（f） is an isometric subgraph of Q4 for all d ≥ 1, and bad otherwise. A non-extendable sequence of contiguous equal digits in a word μ is called a block of μ.Ilic, Klavzar and Rho shown that all the words consisting of one block are good, and all the words consisting of three blocks are bad. So a natural problem is to study the words consisting of other odd number of blocks. In the present paper, a necessary condition for a word consisting of odd number of blocks being good is given, and all the good （bad） words consisting of 5 blocks is determined.

关键词： Generalized Fibonacci cube isometric subgraph good word bad word

Rigidity Theorem of Hypersurfaces with Constant Scalar Curvature in a Unit Sphere

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第6期23卷 1075-1082页

作者： Guo xin wei Department of Mathematical Sciences Tsinghua University Beijing 100084 P. R. China

In this paper, we give a characterization of tori S^1 （ √ nr＋2-n/nr）×S^n-1（√ n-2/nr） and S^m （ √n/m ） ×S^n-m （√n-m/n）. Our result extends the result due to Li （1996）on the condition that M is an n-dimensional complete hypersurface in Sn＋1 with two distinct principal curvatures. Keywords principal curvature, Clifford torus, Gauss equations

关键词： principal curvature Clifford torus Gauss equations

Characterization of a novel fluidic friction-reduction tool used in extended-reach well considering periodic particle-laden jet

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第6期20卷 3700-3711页

作者： Lu-Bo Tang Xiao-Bin Chen wei-wei xin Shao-He Zhang xin-xin Zhang School of Civil Engineering Central South UniversityChangsha410083HunanChina Jiangxi Geological Exploration Bureau for Non-ferrous Metals Nanchang330000JiangxiChina Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of EducationChangsha410083HunanChina School of Geosciences and Info-Physics Central South UniversityChangsha410083HunanChina

Fluidic oscillators(FOs)can be used as an efficient fluidic vibration tool to solve high friction problems in extended-reach ***,the complex mechanism of FOs makes the design challenging,and the dynamic erosion behavior inside FOs is still *** this paper,new FOs are proposed and the working characteristics under the influence of periodic particle-laden jets are ***,the results reveal the working mechanism of new FOs,showing that the generation of pressure pulses is closely connected with periodic jet switching and the development of ***,the important performance parameters,i.e.,pressure pulse and oscillation frequency,are extensively studied through numerical simulation and experimental *** is found that the performance can be optimized by adjusting the tool structure according to different engineering ***,the oscillating solid-liquid two-phase flow inside FO is *** is demonstrated that the accumulation of particles leads to a significant reduction in *** results also reveal five locations that are susceptible to erosion and the erosion behavior of these locations are *** has been shown that the periodic jet causes fluctuations in the amount of erosion at the outlet and *** research can provide valuable references for the design and optimization of vibration friction-reduction tools.

关键词： Extended-reach well Fluidic oscillator Vibratory tool Erosion Friction reduction

Two schemes of perfect teleportation one-particle state by a three-particle general W state

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2008年第4期15卷 60-62页

作者： ZHA xin-wei Department of Applied Mathematics and Applied Physics Xi'an Institute of Posts and Telecommunications Xi'an 710061 China

In teleportation, it can be seen that the probability of success is determined by Alice＇s measurement and quantum channel, ff the Alice＇s measurement is appropriate, the teleportation can be successfully realized with the maximal probability. In accordance with transformation operator, two schemes are proposed for teleportation of an unknown one-particle state via a general W state, through which the successful probability and the fidelity of both schemes reach 1. Furthermore, two optimal matches of orthogonal complete measurement bases are given for teleporting an unknown one-particle state.

关键词： orthogonal complete measurement bases quantum information perfect teleportation general W state

Synthesis of Heterocycle Compounds Containing Two Pyridazinone Units

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第6期24卷 739-742页

作者： xin Bing-wei Department of Chemistry Dezhou University Dezhou 253023 P. R. China

Four novel compounds containing two pyridazinone units attached to one benzene or pyridine ring, protected and deprotected 1,5-di[3（2H）-pyridazinon-6-yl]benzene and 2,6-di[3（2H）-pyridazinon-6-yl]pyridine were synthesized in eight steps, which provided a useful method for the preparation of pyridazinone derivatives via the Stetter and cyclization reactions. Their structures were characterized by ^1H NMR, ^13C NMR, and HRMS.

关键词： 1,5-Di[3(2H)-pyridazinon-6-yl]benzene 2,6-Di[3(2H)-pyridazinon-6-yl]pyridine Pyridazinone Stetter reaction Antitumor compound

Probabilistic Controlled Teleportation of an Arbitrary Three-Qubit State

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第9期50卷 637-639页

作者： ZHA xin-wei Department of Applied Mathematics and Applied Physics Xi＇an Institute of Posts and Telecommunications Xi＇an 710121 China

Recently Jiang et al.[***.24 (2007) 1144] gave a scheme for probabilistic controlled tele-portation of a triplet W state from the sender Alice to the distant receiver *** m controlled qubits are sharedby m(s_1,s_2,...,s_m) spatially-separated *** on transformation operator,we can extend to teleporting anarbitrary three-qubit *** relation between the transformation operators and the Bob's unitary transformation isalso obtained.

关键词： controlled teleportation three-qubit state transformation operator

Tensile Behavior Analysis of Loess Using Digital Image Correlation Method

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2023年第6期34卷 1916-1919页

作者： xin wei Ling Xu Department of Civil Engineering School of Human Settlements and Civil EngineeringXi'an Jiaotong UniversityXi'an 710049China

0 *** are generally weak in *** with compression or shear strength,the tensile strength of soils is usually neglected,for example in the analysis or design of earthen ***,knowledge of the tensile strength is of great importance for interpreting cracking behaviors in soils(wei et al.,2016;Kodikara and Costa,2013).Tensile strength and tensile stress both are important parameters that are considered in desiccation cracking process.

关键词： strength cracking process.

Distortion minimization for multimedia transmission in NOMA HAP-UAV integrated aerial access networks

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第9期35卷 81-94页

作者： Guobin ZHANG Zhu HAN Hang xin xin wei Boya DI School of Electrical Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China Department of Electrical and Computer Engineering and Department of Computer Science University of HoustonTX77004USA School of Computer Science and Technology Dongguan University of TechnologyDongguan 523808China Department of Computing Imperial CollegeLondon SW72AzUK

Aerial access networks have been envisioned as a promising 6G solution to enhance the ground communication systems in both coverage and capacity. To better utilize the spectrum and fully explore different channel characteristics, this paper constructs an integrated network comprising the High Altitude Platform(HAP) and Unmanned Air Vehicles(UAVs) with the NonOrthogonal Multiple Access(NOMA) technology. In order to improve the transmission quality of images and videos, a power management scheme is proposed to minimize the distortion of the transmissions from the HAP and UAVs to the terminals. The power control is formulated as a non-convex problem constrained by the maximal transmit power and the minimal terminal rate requirements. The variable substitution and the first-order Tailor’s expansion is used to transform it into a sequence of convex problems, which are subsequently solved through the gradient projection method. Simulation demonstrates the signal distortion and error rate improvement achieved by the proposed algorithm.

关键词： Aerial Access Networks High Altitude Platform Non-Orthogonal Multiple Access Sixth-Generation Unmanned Air Vehicles

Corrosion Evolution of Steel Reinforced Concrete Under Simulated Tidal and Immersion Zones of Marine Environment

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第7期32卷 900-912页

作者： Jie wei Chang-Gang Wang xin wei xin Mu Xiao-Yan He Jun-Hua Dong wei Ke Environmental Corrosion Center Institute of Metal Research Chinese Academy of Sciences

The corrosion evolution processes of steel reinforced concrete under simulated tidal and immersion zones of marine environment were investigated by using electrochemical measurements and corrosion morphology observations. The results indicate that the corrosion of rebar in concrete under both environments experiences the deterioration from passivation to pitting corrosion and then to general corrosion. Specially, the pitting plays the major role only in the early stage of corrosion, and the general corrosion replaces the dominate role of pitting during the long-term corrosion. In addition, both the pitting depth on local surface and the rust thickness on the overall surface of rebar in the tidal condition are larger than those in immersion condition, which is attributed to the faster corrosion rate in tidal zone caused by the concentrated chloride ions and sufficient oxygen supply.

关键词： Marine environment Reinforced concrete Corrosion evolution Pitting - General corrosion