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Fabrication and Characterizations of Metallic Mg Containing PMMA-Based Partially Degradable Composite Bone Cements

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Acta Metallurgica Sinica(English Letters) 2019年第7期32卷 808-816页

作者： xiao lin Adrian Chan xiao-xiao Tan Hui-lin Yang Lei Yang Orthopaedic Institute Soochow University Suzhou 215006 China Department of Orthopaedics The First Affiliated Hospital of Soochow University Suzhou 215006 China Waterloo Institute for Nanotechnology (WIN) University of Waterloo 200 University Ave West Waterloo ON Canada School of Materials Engineering Shanghai University of Science and Engineering Shanghai 201620 China

Inadequate strength at the bone/cement interface is one of the main drawbacks of poly(methylmethacrylate)(PMMA) bone cement in the current orthopedic surgeries. In the present work, a partially degradable PMMA/Mg composite bone cement (PMC) was developed for enhancing the bone/cement interfacial strength, which is proposed to be accomplished by increasing the osteo-conductivity of PMMA and enhancing the mechanical interlocking between bone tissue and the porous PMMA surface formed by the degradation of Mg on the surface of the cement. PMCs were prepared with various concentrations of Mg particles with different sizes and alloy compositions. The effects of Mg particle size, composition and content on the injectability, mechanical and degradation properties, and biocompatibility of PMCs were evaluated. The results show that these parameters affected the properties of the PMCs simultaneously. The good injectability and compressive strengths of PMMA were preserved, while the compatibility to osteoblasts was enhanced when adding Mg particles in a proper manner. The PMCs degraded at the surface with time and formed porous surface structures in the physiological environment, while maintaining the original compressive strengths. This preliminary study shows that the PMC is promising for minimally invasive orthopedic surgery;however, it still requires to be optimized and evaluated in the future.

关键词： Biomaterials Composite Magnesium Poly(methylmethacrylate) Bone cement Kyphoplasty

Regression Analysis for the Additive Hazards Model with General Biased Survival Data

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Acta Mathematicae Applicatae Sinica 2020年第3期36卷 545-556页

作者： xiao-lin CHEN School of Statistics Qufu Normal UniversityQufu 273165China

In survival analysis,data are frequently collected by some complex sampling schemes,e.g.,length biased sampling,case-cohort sampling and so *** this paper,we consider the additive hazards model for the general biased survival data.A simple and unified estimating equation method is developed to estimate the regression parameters and baseline hazard *** asymptotic properties of the resulting estimators are also ***,to check the adequacy of the fitted model with general biased survival data,we present a test statistic based on the cumulative sum of the martingale-type *** studies are conducted to evaluate the performance of proposed methods,and applications to the shrub and Welsh Nickel Refiners datasets are given to illustrate the methodology.

关键词： additive hazards model estimating equation general biased sampling model checking survival data

Shaping free-electron radiation via van der Waals heterostructures

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Light(Science & Applications) 2023年第8期12卷 1457-1458页

作者： xiao lin Hongsheng Chen Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterCollege of Information Science&Electronic EngineeringZhejiang UniversityHangzhou 310027China international Joint Innovation Center the Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua 321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing 312000China

The van der Waals heterostructures with aperiodic stackings have been exploited to shape the spatiotemporal wavefront of free-electron X-ray radiation.

关键词： free stacking exploit

The codes of matter and their applications

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Science Bulletin 2015年第19期60卷 1661-1673页

作者： xiao-lin Wang Spintronic and Electronic Materials Group Institute for Superconducting and Electronic Materials Australia Institute for Innovative Materials University of Wollongong

The elements in the periodic table are the building blocks used to form substances with different compositions. Nevertheless, it is the properties of substances that are decisive for their existence and practical applications. Searching for new class of materials with exotic properties has always been challenging because of the complexity of both the theoretical and the experimental approaches developed so far. Here, we propose that the three ubiquitous and paramount attributes of all existing matter charge(Q), spin(S) or rotational motion, and linear motion(K) can be used to account for the formation of different types of matter/materials and their properties that have been or will be known to us. The three attributes or original codes can produce six primary codes which can further produce another sixty codes. The physical meanings represented by each code are unlocked. The table consisting of the 60 codes is introduced as the table of properties of codes of matter. We demonstrate that these codes can be used as building blocks to form new properties and new materials. Many new types of quasiparticles and new classes of materials with exotic properties of Q, S and K are predicted. Their possible experimental realizations are proposed. The possible applications of the codes of matter in other fields such as elementary particles, photonics and chemistry are briefly discussed. We know that there should be more new materials and new electronic, spin and photonic states to be discovered, but we do not know what they are. The codes of matter clearly reveal to us how many and what they are and how easily we can recognize what they are. Experimental and theoretical exploration for new forms of matter, new quasiparticles, or new electronic and spin states, or new states of photon or properties of light, as well as macroscopic entities with exotic properties represented by the codes of matter, is imminent.

关键词： New materials New electronic state New method Materials design

Partially Time-varying Coefficient linear Rate Model for the Recurrent Event Data

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Acta Mathematicae Applicatae Sinica 2014年第3期30卷 681-698页

作者： xiao-lin CHEN College of Science China University of Petroleum

In [13], Schaubel et al. proposed a semiparametric partially linear rate model for the statistical analysis of recurrent event data. But they only considered the model with time-independent covariate effects. In this paper, rate function of the recurrent event is modeled by a semipaxametric partially linear function which can include the time-varying effects. We propose the method of generalized estimating equations to make inferences about both the time-varying effects and time-independent effects. The large sample properties are established, while extensive simulation studies are carried out to examine the proposed procedures. At last, we apply the procedures to the well-known bladder cancer study.

关键词： partially linear rate model empirical process recurrent event time-varying effects.

Various Expressions for Modulus of Random Convexity

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Acta Mathematica Sinica,English Series 2013年第2期29卷 263-280页

作者： xiao lin ZENG College of Mathematics and Statistics Chongqing Technology and Business University

We first prove various kinds of expressions for modulus of random convexity by using an L^0（F, R）-valued function＇s intermediate value theorem and the well known Hahn-Banach theorem for almost surely bounded random linear functionals, then establish some basic properties including continuity for modulus of random convexity. In particular, we express the modulus of random convexity of a special random normed module L^0（F, X） derived from a normed space X by the classical modulus of convexity of X.

关键词： Random normed module modulus of random convexity Hahn-Banach theorem for almostsurely bounded random linear functionals

Dirac spin-gapless semiconductors:promising platforms for massless and dissipationless spintronics and new(quantum) anomalous spin Hall effects

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National Science Review 2017年第2期4卷 252-257页

作者： xiao-lin Wang Spintronic and Electronic Materials Group Institute for Superconducting and Electronic MaterialsAustralian Institute for Innovative MaterialsUniversity of Wollongong

It is proposed that the new generation of spintronics should be ideally massless and dissipationless for the realization of ultra-fast and ultra-low-power spintronic devices. We demonstrate that the spin-gapless materials with linear energy dispersion are unique materials that can realize these massless and dissipationless states. Furthermore, we propose four new types of spin Hall efects that consist of spin accumulation of equal numbers of electrons and holes having the same or opposite spin polarization at the sample edge in Hall efect measurements, but with vanishing Hall voltage. hese new Hall efects can be classiied as(quantum) anomalous spin Hall efects. he physics for massless and dissipationless spintronics and the new spin Hall efects are presented for spin-gapless semiconductors with either linear or parabolic dispersion. New possible candidates for Dirac-type or parabolic-type spin-gapless semiconductors are proposed in ferromagnetic monolayers of simple oxides with either honeycomb or square latices.

关键词： spintronics spin-gapless materials spin Hall efects

A Fully Complex-Valued Gradient Neural Network for Rapidly Computing Complex-Valued linear Matrix Equations

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Chinese Journal of Electronics 2017年第6期26卷 1194-1197页

作者： xiao lin LU Rongbo College of Information Science and Engineering Jishou University

This paper concerns online solution of complex-valued linear matrix equations in the complex domain. Differing from the real-valued neural network,which is only designed for solving real-valued linear matrix equations in the real domain, a fully complex-valued Gradient neural network(GNN) is developed for computing complex-valued linear matrix equations. The fully complex-valued GNN model has the merit of reducing the unnecessary complexities in theoretical analysis and realtime computation, as compared to the real-valued neural network. Besides, the convergence analysis of the proposed complex-valued GNN model is presented, and simulation experiments are performed to substantiate the effectiveness and superiority of the proposed complex-valued GNN model for online computing the complex-valued linear matrix equations in the complex domain.

关键词： Gradient neural network(GNN) Complex domain Complex-valued linear matrix equation Simulation verification

Temperature and hydrogen-like impurity effects on the excited state of the strong coupling bound polaron in a CsI quantum pseudodot

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Chinese Physics B 2017年第2期26卷 399-402页

作者： Jing-lin xiao Institute of Condensed Matter Physics Inner Mongolia University for the Nationalities Tongliao 028043 China

With hydrogen-like impurity（HLI） located in the center of Cs I quantum pseudodot（QPD） and by using the variational method of Pekar type（VMPT）, we investigate the first-excited state energy（FESE）, excitation energy and transition frequency of the strongly-coupled bound polaron in the present paper. Temperature effects on bound polaron properties are calculated by employing the quantum statistical theory（QST）. According to the present work＇s numerical results, the FESE, excitation energy and transition frequency decay（amplify） with raising temperature in the regime of lower（higher）temperature. They are decreasing functions of Coulomb impurity potential strength.

关键词： temperature effect bound polaron CsI quantum pseudodot quantum statistical theory excited state