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Optimization on magnetic properties of Nd-doped Fe_(3)O_(4) nanoparticles for magnetic shielding fabrics

Journal of Rare Earths 2024年第4期42卷 683-689页

作者： Xiaolei Song Congzhu Xu Yuyan Wang Huizhen Ke Yonggui Li qufu Wei Xinqun Feng Faculty of Clothing and Design Minjiang UniversityFuzhou350108China Fujian Key Laboratory of Novel Functional Textile Fibers and Materials Minjiang UniversityFuzhou350108China College of Textile and Clothing Jiangnan UniversityWuxi214122China College of Fashion and Design Donghua UniversityShanghai201620China

High magnetic protective fabrics with rare earth Nd doped Fe_(3)O_(4) nanoparticles were fabricated via a grafting *** structure,crystal form,and elemental composition of nanoparticles were investigated by transmission electron microscopy,energy dispersive X-ray,X-ray powder diffraction,and X-ray photoelectron *** obtained NdFe_(2.O_(4) nanoparticles show spherical shape with fine dispersion and reasonable element ***,they demonstrate fine superparamagnetic properties with a magnetic saturation value of 2..2. A·m^(2./g and low coercivity of 1.902.mT through the vibrating sample magnetometry technique,which can be well developed in magnetic shielding protective ***,the cotton fabrics with plain weave were finished by a proofing rapier loom as a *** NdFe_(2.O_(4) nanoparticles underwent some appropriate surface modification and then were grafted onto the cotton fabrics by a bridge agent of N,N’-dissuccinimidyl *** morphology,structure,dispersion effect,and electromagnetic protective properties of the fabrics were observed through scanning electron microscopy,Fourier infrared spectroscopy,thermogravimetric analysisdifferential scanning calorimetry(TG-DSC),and a vector network *** reliable fabrics with grafting reaction on the interface are expected to have potential applications in the field of electromagnetic protection and biomedicine fields.

关键词： Magnetic property Nd Fe_(3)O_(4)nanoparticles Magnetic shielding Fabrics Rare earths

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Joint density of hitting time and point to an ellipse for Brownian motion

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Chinese Science Bulletin 1997年第24期42卷 2054-2058页

作者： YIN Chuancun ZHAO Xuelei Department of Mathematics, qufu normal {2., qufu 2.3.65, china 2. Institute of Mathematics, Shantou {2., Shantou 515063, china Department of Mathematics Qufu Normal University Qufu China Institute of Mathematics Shantou University Shantou China

IT is well known that the distribution of hitting time, hitting point, last exiting time, and lastexiting point for Brownian motion to balls has been extensively studied. A similar investi-gation of rectangles or cubes has also been well done. However, analogous questions for Brow-nian motion to ellipsoid are rarely concerned. Bai and Cai obtained the distribution of

关键词： Brownian motion hitting time hitting point ellipse.

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Global convergence property of s-dependent GFR conjugate gradient method

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Chinese Science Bulletin 1998年第23期43卷 1959-1965页

作者： WANG Changyu 1,2.and ZHANG Yuzhong\+1 1. Institute of Operations Research in qufu normal {2., qufu 2.3.65, china 2. Institute of Applied Mathematics, Chinese Academy of Sciences, Beijing 100080, china Institute of Operations Research Qufu Normal University Qufu China Institute of Applied Mathematics Chinese Academy of Sciences Beijing China

An \%S\%_dependent GFR method and a generalized conjugate gradient method are designed. Two estimated values of upper bounds for the ratio of β k to β FR k are given. The two convergence theorems are proved. The global convergent properties of \%s\%_dependent GFR method are obtained adopting several choice strategies of steplength and some results in recent literature are extended.

关键词： steplength linear search global convergence conjugate gradient.

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Optical waveguides in LiNbO_3 and stoichiometric LiNbO_3 crystals by proton exchange

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Science china(Physics,Mechanics & Astronomy) 2008年第10期51卷 1479-1488页

作者： LI ShiLing College of Physics and Engineering, qufu normal {2., qufu 2.3.65, china School of Physics and Microelectronics, Shandong {2., Jinan 2.0100, china College of Physics and Engineering Qufu Normal University Qufu China School of Physics and Microelectronics Shandong University Jinan China

The formation of optical planar waveguides in LiNbO3 and stoichiometric LiNbO3 crystals by proton exchange was reported. The prism-coupling method was used to characterize the dark-line spectroscopy at the wavelength of 633 and 1539 nm, re-spectively. The mode optical near-field outputs from proton-exchanged LiNbO3 and SLN waveguides at 633 nm were presented. The mode field from stoichiometric LiNbO3 (SLN) waveguide is lighter and more uniform than that from LiNbO3 waveguide, which means the quality of the waveguide in SLN crystal is better than that of the LiNbO3 waveguide. For proton-exchanged LiNbO3 waveguides, the evo-lution of the refractive index profile with annealing was presented. The disorder profiles of Nb atoms in proton-exchanged LiNbO3 waveguides were obtained by Rutherford backscattering/channeling technique. It is shown that the longer the exchange time, the larger the displacement of Nb atoms.

关键词： optical waveguide proton exchange LiNbO3 crystal stoichiometric LiNbO3 crystal

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On Eigenvalue Intervals and Eigenfunctions of Nonresonance Singular Dirichlet Boundary Value Problems

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Acta Mathematicae Applicatae Sinica 2002年第4期18卷 569-578页

作者： Zhao-cai HaoDepartment of Mathematics, qufu normal {2., qufu 2.3.65, china Department of Mathematics Qufu Normal University Qufu China

In this paper we shall consider the nonresonance Dirichlet boundary value problemwhere λ>0 is a parameter, p>0 is a constant. Intervals of A are determined to ensure the existence of a nonnegative solution of the boundary value problem. For λ=1, we shall also offer criteria for the existence of eigenfunctions. The main results include and improve on those of [2.4,6,8].

关键词： Eigenvalue intervals eigenfunctions fixed points cone

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Moment bounds for IID sequences under sublinear expectations

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Science china Mathematics 2011年第10期54卷 2155-2160页

作者： HU Feng1,2.1Department of Mathematics,qufu normal {2.,qufu 2.3.65,china 2.chool of Mathematics,Shandong {2.,Jinan 2.0100,china Department of Mathematics Qufu Normal University Qufu China School of Mathematics Shandong University Jinan China

With the notion of independent identically distributed(IID) random variables under sublinear expectations introduced by Peng,we investigate moment bounds for IID sequences under sublinear expectations. We obtain a moment inequality for a sequence of IID random variables under sublinear expectations. As an application of this inequality,we get the following result:For any continuous functionsatisfying the growth condition |(x) | C(1 + |x|p) for some C > 0,p 1 depending on ,the central limit theorem under sublinear expectations obtained by Peng still holds.

关键词： moment bound sublinear expectation IID random variables G-normal distribution central limit theorem

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A differentiable sphere theorem with positive Ricci curvature and reverse volume pinching

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Science china Mathematics 2011年第3期54卷 603-610页

作者： WANG PeiHe1 & WEN YuLiang2.1School of Mathematical Sciences, qufu normal {2., qufu 2.3.65, china 2.epartment of Mathematics, East china normal {2., Shanghai 2.02.1, china School of Mathematical Sciences Qufu Normal University Qufu China Department of Mathematics East China Normal University Shanghai China

Let Mn be a compact, simply connected n (≥3)-dimensional Riemannian manifold without bound-ary and Sn be the unit sphere Euclidean space Rn+1. We derive a differentiable sphere theorem whenever themanifold concerned satisfies that the sectional curvature KM is not larger than 1, while Ric(M)≥n+2.4 and the volume V (M) is not larger than (1 + η)V (Sn) for some positive number η depending only on n.

关键词： k-th Ricci curvature Hausdorff convergence differentiable sphere theorem harmonic coordinate harmonic radius

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CONTINUITY AND LINEARITY OF ADDITIVE DERIVATIONS OF NEST ALGEBRAS ON BANACH SPACES

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Chinese Annals of Mathematics,Series B 1996年第2期17卷 227-236页

作者： HAN DEGUANG Department of Mathematics, Qufa normal university,{2., Shandong, china. Department of Mathematics Qufa Normal University Qufu 273165 Shandong China

This paper discusses the problem concerning the continuity and linearity of additive derivation of nest algebras on normed spaces. It is proved that every linear derivation of a nest algebraalgN is continuous provided that one of the following conditions is satisfied: (1) 0+ (?) 0. (2.X_ (?) X. (3) there exists a non-trivial idempotent p in algN such that the range of p belongsto N. It is also proved that every additive derivation of a nest algebra is automatically linearif the underlying normed space is infinite dimemnsional.

关键词： Nest algebra Derivation Continuity Linearity Banach space

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Uniquely ergodic property of minimal probability measure in positive definite Lagrangian systems

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Science china Mathematics 2006年第12期49卷 1864-1866页

作者： CHEN Jing & BAI Yuzhen Department of Mathematics, Nanjing university, Nanjing 2.0093, china Department of Mathematics, {2. normal university, qufu 2.3.65, china Department of Mathematics Nanjing University Nanjing China Department of Mathematics Qufu Normal University Qufu China

Mane conjectured that every minimal measure in the generic Lagrangian systems is uniquely ergodic. In this paper, we will show that the answer to the Mane's conjecture is negative by analyzing the structure of the sup... 详细信息

关键词： minimal probability measure,uniquely ergodic,Mather theory,Lagrangian systems.

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Controlled Quantum N-Party Simultaneous Direct Communication

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Communications in Theoretical Physics 2007年第7期48卷 79-82页

作者： XIA Yun-Jie MAN Zhong-Xiao College of Physics and Engineering,qufu normal {2.,qufu 2.3.65,china College of Physics and Engineering Qufu Normal University Qufu 273165 China

In this paper,we propose a controlled quantum N-party simultaneous direct communication protocolwith single-qubit *** users can simultaneously exchange their secret messages in a set of devices withthe control of a **... 详细信息

关键词： direct communication N-party simultaneous

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