检索结果-南通市图书馆

Brillouin expanded time-domain analysis based on dual optical frequency combs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第8期13卷 1534-1544页

作者： Jae Hyeong Youn Kwang Yong Song Sonia Martin-Lopez Miguel Gonzalez-Herraez María R.Fernández-Ruiz dept.of physics Chung-Ang UniversitySeoulKorea dept.of Electronics Universidad de AlcaláMadridSpain

Brillouin Optical Time-Domain Analysis(BOTDA)is a widely-used distributed optical fiber sensing technology employing pulse-modulated pump waves for local information retrieval of the Brillouin gain or loss *** spatial resolution of BOTDA systems is intrinsically linked to pulse duration,so high-resolution measurements demand high electronic bandwidths inversely proportional to the *** paper introduces Brillouin Expanded Time-Domain Analysis(BETDA)as a modified BOTDA system,simultaneously achieving high spatial resolution and low detection *** two optical frequency combs(OFCs)with different frequency intervals as pump and probe,local Brillouin gain spectra are recorded by their spectral beating traces in an expanded time domain.A 2-cm-long hotspot located in a 230m single-mode fiber is successfully measured in the time domain with a detection bandwidth of less than 100 kHz using dual OFCs with tailored spectral phase,line spacing,and bandwidth.

关键词： pump optical fiber

Generalized fuzzy ideals of near-rings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied math.matics(A Journal of Chinese Universities) 2009年第3期24卷 343-349页

作者： ZHAN Jian-ming Davvaz B. dept. of math. Hubei Institute for Nationalities Enshi 445000 China dept. of math. Yazd University Yazd Iran

The concept of（∈,∈∨q）-fuzzy subnear-rings（ideals） of a near-ring is introduced and some of its related properties are *** particular,the relationships among ordinary fuzzy subnear-rings（ideals）,（∈,∈∨ q）-fuzzy subnear-rings（ideals） and（∈,∈∨q）-fuzzy subnear-rings（ideals） of near-rings are ***,some characterization of [μ]t is given by means of（∈,∈∨ q）-fuzzy ideals.

关键词： near-ring subnear-ring (ideal) (∈,∈ ∨ q)-fuzzy subnear-ring (ideal) (∈ ∈∨ q)-fuzzy subnear-ring(ideal)

Φ-INEQUALITIES AND LAWS OF LARGE NUMBERS OF HARDY MARTINGALETRANSFORMS

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1997年第3期17卷 269-275页

作者：刘培德吐尔德别克 dept. of math. Wuhan University Wuhan 430071 China dept. of math. Xinjiang University Ulumuqi 830046 China

Using stopping time method we proved the Φ-inequalities, pointwise convergence, strong and weak laws of large numbers of Hardy martingale transforms with values in complex Banach spaces, and applying them to give sev... 详细信息

关键词： AUMD space Hardy martingale martinale transform geometry of complex Banach space

MEAN VALUE OF ANALYTIC OPERATOR FUNCTIONS

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1995年第4期15卷 468-473页

作者：喻小培蹇明 dept. of math. Central China Normal University Wuhan 430070 China dept. of math. & physics Wuhan Univ. of Technology Wuhan 430070 China

In this paper, it is proved that if A is a normal proper contraction on Hilbert space H and F(z) = U(z) + iV(z) is operator-valued analytic on the unit disc Delta and 0 < p < 1, then parallel to F(A)parallel to(p) les... 详细信息

关键词： Hilbert space operator operator-valued function proper contraction

Optimizing multi-parameter distributed fiber sensors:a hybrid Rayleigh-Brillouin-Raman System approach

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第3期13卷 393-395页

作者： Kwang Yong Song dept.of physics Chung-Ang University84 Heukseok-roDongjak-guSeoul 06974Korea

An optimized single-end hybrid Rayleigh,Brillouin,and Raman distributed fiber sensing system has been developed for simultaneous measurement of multiple *** system integrates 3-bit pulse coding for the Raman signal and the Brillouin amplification of the Rayleigh-backscattered signal,discriminating strain,temperature,and vibration using a single sensing fiber.

关键词： fiber Rayleigh signal

A Procedure for Trisecting an Acute Angle (Method 2)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Pure math.matics 2024年第4期14卷 204-213页

作者： Lyndon O. Barton Department of math.and physics Delaware State University Dover USA

This paper presents an alternate graphical procedure (Method 2), to that presented in earlier publications entitled, “A Procedure for Trisecting an Acute Angle” and “A Key to Solving the Angle Trisection Problem”. The procedure, when applied to the 30˚ and 60˚ angles that have been “proven” to be nottrisectable and the 45˚ benchmark angle that is known to be trisectable, in each case produced a construction having an identical angular relationship with Archimedes’ Construction, as in Section 2 on THEORY of this paper, where the required trisection angle was found to be one-third of its respective angle (i.e. DE’MA = 1/3 DE’CG). For example, the trisection angle for the 30˚, 45˚ and 60˚ angles were 10.00000˚, 15.00000˚, and 20.00000˚, respectively, and Section 5 on PROOF in this paper. Therefore, based on this identical angular relationship and the numerical results (i.e. to five decimal places), which represent the highest degree of accuracy and precision attainable by The Geometer’s Sketch Pad software, one can only conclude that not only the geometric requirements for arriving at an exact trisection of the 30˚ and 60˚ angle (which have been “proven” to be not-trisectable) have been met, but also, the construction is valid for any arbitrary acute angle, despite theoretical proofs to the contrary by Wantzel, Dudley, and others.

关键词： Archimedes’ Construction College Geometry College math.matics Angle Trisection Famous Problems in math.matics Mechanism Analysis Geometer’s Sketch Pad

Multilinear singular and fractional integrals on weighted Hardy spaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied math.matics(A Journal of Chinese Universities) 2009年第2期24卷 214-220页

作者： ZHANG Pu LAN Jia-cheng dept. of math. Mudanjiang Teachers College Mudanjiang 157012 China dept. of math. Lishui College Lishui 323000 China

In this paper the boundedness properties of multilinear singular and fractional integrals on the weighted Hardy spaces are studied.

关键词： multilinear singular integral multilinear fractional integral Lipschitz function L^r-Dini condition weighted Hardy space

INITIAL BOUNDARY VALUE PROBLEMS FOR A CLASS OF NONLINEAR INTEGRO－PARTIAL DIFFERENTIAL EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Applied math.matics and Mechanics(English Edition) 1994年第4期15卷 389-404页

作者：崔尚斌屈长征 dept. of math. Lanzhou Univ. Lanzhou dept. of math. Northwest Univ. Xi'an

This paper studies the global existence of the classical solutions to the following problem:This problem describes the nonlinear vibrations of finite rods with nonlinear vis-coelasticity. Under certain conditions on ... 详细信息

关键词： integro-partial differential equation initial value problem global classical solution

Periodic boundary value problem for the first order functional differential equations with impulses

在线全文

学校读者我要写书评

暂无评论

Applied math.matics(A Journal of Chinese Universities) 2009年第1期24卷 27-35页

作者： LIANG Rui-xi SHEN Jian-hua dept. of math. Hunan Normal Univ. Hunan 410081 China dept. of math. Huaihua College Hunan 418008 China

This paper is concerned with the existence and approximation of solutions for a class of first order impulsive functional differential equations with periodic boundary value conditions. A new comparison result is pres... 详细信息

关键词： functional differential equation periodic boundary value problem lower and upper solution monotone iterative method