Proton induced X-ray emission (PIXE) analysis of sources of porcelain body of Ru Guan and Jun Guan porcelains

34 samples of Ru Guan porcelain body and 50 samples of Jun Guan porcelain body (both kinds being in different body colors) were selected with the purpose of finding out the source of raw materials and their classification relationship so as to search for ways of non-destructive discrimination. Proton induced X-ray emission (PIXE) has been applied to these samples to determine their chemical elements. The data of seven major chemical elements collected from these samples were further studied through fuzzy cluster analysis. Results indicate that the origin of raw materials of Jun Guan porcelain body samples is comparatively more concentrated in certain places, while that of Ru Guan porcelain body samples is scattered about. The places of origin of raw materials of the majority of Ru Guan and Jun Guan porcelain body samples have something in common, but some differences still exist. It might be an important way for non-destructive discrimination among Ru Guan and Jun Guan porcelains by combining PIXE with fuzzy cluster analysis.     

Parameter identification of chaos system based on unknown parameter observer

Parameter identification of chaos system based on unknown parameter observer is discussed generally. Based on the work of Guan et al. [X.P. Guan, H.P. Peng, L.X. Li, et al., Acta Phys. Sinica 50 (2001) 26], the design of unknown parameter observer is improved. The application of the improved approach is extended greatly. The works in some literatures [X.P. Guan, H.P. Peng, L.X. Li, et al., Acta Phys. Sinica 50 (2001) 26; J.H. Lü, S.C. Zhang, Phys. Lett. A 286 (2001) 148; X.Q. Wu, J.A. Lu, Chaos Solitons Fractals 18 (2003) 721; J. Liu, S.H. Chen, J. Xie, Chaos Solitons Fractals 19 (2004) 533] are only the special cases of our Corollaries 1 and 2. Some observers for Lü system and a new chaos system are designed to test our improved method, and simulations results demonstrate the effectiveness and feasibility of the improved approach.     

Main chemical ingredients of the celadon glaze from Qingliangsi kiln and Zhanggongxiang kiln

The proton induced X-ray emission (PIXE) is used to determine the chemical ingredients of seven main elements in the samples of Ru Guan porcelain glazes and Ru Civil porcelain from Qingliangsi kiln in Baofeng County and the samples of celadon glaze from Zhanggongxiang kiln in Ruzhou City. The PIXE data are then analyzed by scatter analysis and fuzzy cluster method for determining their classification and provenance. The results show that there are obvious differences between the ingredients of glaze material of Ru Guan porcelain and Ru Civil porcelain from Qingliangsi kiln, of which the former ingredients are stable and its source is localized, and that the sources and ingredients of the glaze of Ru Guan porcelain and those of celadon glaze from Zhanggongxiang kiln are not wholly the same, of which the latter sources are much scattering.     

A unified model for Sierpinski networks with scale-free scaling and small-world effect

In this paper, we propose an evolving Sierpinski gasket, based on which we establish a model of evolutionary Sierpinski networks (ESNs) that unifies deterministic Sierpinski network [Z.Z. Zhang, S.G. Zhou, T. Zou, L.C. Chen, J.H. Guan, Eur. Phys. J. B 60 (2007) 259] and random Sierpinski network [Z.Z. Zhang, S.G. Zhou, Z. Su, T. Zou, J.H. Guan, Eur. Phys. J. B 65 (2008) 141] to the same framework. We suggest an iterative algorithm generating the ESNs. On the basis of the algorithm, some relevant properties of presented networks are calculated or predicted analytically. Analytical solution shows that the networks under consideration follow a power-law degree distribution, with the distribution exponent continuously tuned in a wide range. The obtained accurate expression of clustering coefficient, together with the prediction of average path length reveals that the ESNs possess small-world effect. All our theoretical results are successfully contrasted by numerical simulations. Moreover, the evolutionary prisoner’s dilemma game is also studied on some limitations of the ESNs, i.e., deterministic Sierpinski network and random Sierpinski network.     

1.06μm激光等离子体X光转换实验研究

Ｘ光转换是激光—等离子体相互作用中的一个重要研究课题。文中介绍了在“神光”装置上利用亚千Ｘ光能谱仪测量Ｘ光能谱、辐射温度与Ｘ光转换效率；并给出了转换Ｘ光总量、辐射温度与激光能量、脉冲宽度及腔面积的定标关系。     

急冷Al-Si合金负磁阻效应的一个可能解释

管惟炎等人观察到的Al-Si急冷合金的负磁阻效应,实际上就是以R-H_e曲线的形式表示出来的第二类超导膜的纵场峰值效应。在磁通线切割模型基础上,对这个效应提出了一个可能的解释。 关键词：     

EDXRF微量元素分析在文物断源断代中的研究

能量色散X荧光分析（EDXRF）是重要的元素成分析方法之一,现已成为一种强有力的定性和精确定量的无损分析测试技术。能量色散X荧光分析（EDXRF）技术具有不破坏分析样品,并能快速进行钠（Z11）至铀（Z92）的多元素的同时分析,以及分析的浓度范围宽广,精度高等特点,因此,特别适合于进行文物材料的成分分析研究,尤其适合测试极其珍贵的古陶瓷完整文物样品分析与鉴定。文章运用该方法对选自杭州南宋官窑窑址、龙泉古窑址出土的14个样品的南宋官窑青瓷、南宋龙泉窑青瓷和现代仿古青瓷等进行了元素分析的对比研究,分析测定古陶瓷样品中胎、釉的主、次量及微量元素组成,寻找组成中的“指纹”特征元素,试图为古陶瓷文物的断源、断代研究和真伪鉴定提供科学依据。研究结果表明能量色散X荧光分析（EDXRF）是一种较理想的文物研究和鉴定的科学分析手段。     

PIXE analysis of Chinese Ru celadon made in the 11–12th centuries

The Ru kiln is one of the five most famous kilns (Ru, Guan, Ge, Ding and Jun kilns) in the Chinese Song Dynasty (AD 960–1279). The Ru Kuan kiln at Qingliang Temple, Henan Province, originated from the Ru folk kiln. PIXE and factor analysis were employed to study the difference between the folk celadon and the Kuan celadon. The relationship between the Ru Kuan and Ru folk celadons from the Qingliang Temple kiln site and the Ru celadon from the Zhanggongxiang kiln site, found in the last few years, was also studied. The experimental results showed that the same body raw material was used for the production of the Ru Kuan and Ru folk celadons whereas the Ru celadon from Zhanggongxiang was produced from a different body raw material. Factor analysis based on chemical components of the glaze is able to differentiate between the celadons, i.e. Ru Kuan celadon, Ru folk celadon and the Ru celadon from Zhanggongxiang. Copyright © 2005 John Wiley & Sons, Ltd.     

基于独立组分分析和BP神经网络的可见/近红外光谱蜂蜜品牌的鉴别

提出了一种基于独立组分分析的可见/近红外光谱透射技术快速鉴别蜂蜜品牌的新方法。用独立组分分析方法获取蜂蜜的可见/近红外光谱载荷图,将载荷图中相关性最大的波段,作为人工神经网络的输入建立蜂蜜品牌的鉴别模型。建立了一个三层的BP神经网络模型,各层传递函数采用S型(Sigmoid)函数,并设置网络输入层节点数为9,隐含层节点数为10,输出层节点数为3。每个品牌25个样本,3个品牌共75个样本,用来建立BP神经网络模型,剩余的3个品牌各５个样本用于预测,鉴别准确率达100%,模型的拟合残差为8.245 365×10-5。说明基于独立组分分析的方法具有很好的鉴别效果,为蜂蜜的品牌鉴别提供了一种新方法。     

Improved direct measurement of leptonic coupling asymmetries with polarized Z bosons

We present final measurements of the Z boson-lepton coupling asymmetry parameters A(e), A(mu), and A(tau) with the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure A(e) = 0.1544+/-0.0060, A(mu) = 0.142+/-0.015, and A(tau) = 0.136+/-0.015. Combined with our left-right asymmetry measured from hadronic decays, we find A(e) = 0.1516+/-0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin (2)theta(eff)(W) = 0.230 98+/-0.000 26.     

基于Tavis-Cummings模型实现非定域三原子系统量子特性的远程控制

运用全量子理论并结合数值计算方法,研究了三个二能级原子系统的量子特性。初始三原子处于W纠缠态,让其中的两原子A、B与相干态光腔场发生共振作用,经腔QED演化以后,对原子进行Bell基测量,通过调节相干态光场的强度和原子间的偶极相互作用,来控制腔外原子C的布居差演化;对相干态光场进行光子探测,通过改变探测到的光子数、相干光场参量和原子间偶极相互作用,来控制腔外原子C的偶极压缩,最终实现了远程操纵腔外原子非经典特性的目的。     

First integrals and Darboux polynomials of natural polynomial Hamiltonian systems

In this Letter we study some aspects of the relationship between the existence of Darboux polynomials and additional polynomial first integrals in natural polynomial Hamiltonian systems with a finite number of degrees of freedom. More precisely, first we improve results of the paper of Maciejewski and Przybylska [A.J. Maciejewski, M. Przybylska, Phys. Lett. A 326 (2004) 219]; and after we answer two open questions presented in that paper.     

Quantum RLC circuits: Charge discreteness and resonance

In a recent article [C.A. Utreras-Díaz, Phys. Lett. A 372 (2008) 5059], we have advanced a semiclassical theory of quantum circuits with discrete charge and electrical resistance. In this work, we present a few elementary applications of this theory. For the zero resistance inductive circuit, we obtain the Stark ladder energies in yet another way; for the circuit driven by a combination d.c. plus a.c. electromotive force (emf) we generalize earlier results by Chandía et al. [K. Chandía, J.C. Flores, E. Lazo, Phys. Lett. A 359 (2006) 693]. As a second application, we investigate the effect of electrical resistance and charge discreteness, in the resonance conditions of a series RLC quantum circuit.     

原子吸收光度计兼FIA光度法测定沉积物中铝

摘 要 自行研制了一套流动注射比色装置,应用到原子吸收分光光度计上,采用锐线光源的原子吸收分光光度计兼作流动注射分析法中可见光度计使用,研究了沉积物样品中微量铝测定的适宜条件,建立了一种全新的分析测试技术。一次进样同时可连续得到三峰两谷5个吸光度值（A₁, A₂, A₃, A₄, A₅）,均可用于定量分析,并对其理论和实验技术进行了讨论。采用加和技术（A=A₁+A₂+A₃+A₄+A₅）是提高FIA法分析灵敏度的一种有效途径,该方法的灵敏度较普通方法有显著提高,其精密度和线性关系也良好。实验表明,原子吸收分光光度计兼作可见光度计使用,扩大了原子吸收分光光度计的应用范围,操作简单,方法可靠,直接用于沉积物样品中微量铝含量的测定,结果令人满意。     

Determination of the axial-vector weak coupling constant with ultracold neutrons

A precise measurement of the neutron decay β asymmetry A? has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A? = -0.119?66±0.000?89{-0.001?40}{+0.001?23}, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon g{A}/g{V}=-1.275?90{-0.004?45}{+0.004?09}.     

Comment on: “Quantum exam” [Phys. Lett. A 350 (2006) 174]

In the Letter [B.A. Nguyen, Phys. Lett. A 350 (2006) 174], a quantum exam protocol was presented. Here we show a cheating protocol, by which any student can get the other students' solution without being detected. Then we propose a possible modified protocol against this attacking strategy.     

Prediction of mutations in H1 neuraminidases from North America influenza A virus engineered by internal randomness

Recently, we defined the randomness within a protein as an important force engineering mutations. Thereafter we build a cause-mutation relationship, where one side is the quantified randomness and the other side is the occurrence or non-occurrence of mutation. This way, we switch the prediction of mutation into the problem of classification, which can be solved using either logistic regression or neural network. Very recently, we attempted to apply the logistic regression to predicting the mutation positions in proteins from influenza A virus. In this study, we attempt to explore the possibility of applying the neural network to predicting the mutation positions in H1 neuraminidase from influenza A virus. Then we applied the amino-acid mutating probability to predicting the would-be-mutated amino acids at predicted positions. The results confirm the possibility of prediction of mutation using this approach and pave the way for future development.     

Reaction kinetics of diffusing particles injected into a reactive substrate

We analyze the kinetics of trapping (A+B-->B) and annihilation (A+B-->0) processes on a one-dimensional substrate with homogeneous distribution of immobile B particles while the A particles are supplied by a localized source. For the imperfect reaction case, we analyze both problems by means of a stochastic model and compare the results with numerical simulations. In addition, we present the exact analytical results of the stochastic model for the case of perfect trapping.     

Performance comparison between classical and quantum control for a simple quantum system

Brańczyk et al. pointed out that the quantum control scheme is superior to the classical control scheme for a simple quantum system using simulation [A.M. Brańczyk, P.E.M.F. Mendonca, A. Gilchrist, A.C. Doherty, S.D. Barlett, Quantum control theory of a single qubit, Physical Review A 75 (2007) 012329 or arXiv e-print quant-ph/0608037]. Here we rigorously prove the result. Furthermore we will show that any quantum operation does not universally “correct” the dephasing noise.