Temperature dependent phonon modes and ionicity of LiGaO2 single crystal

This paper reports that polarized far-infrared reflectivity measurements have been done on LiGaO2 single crystal along two crystalline taxes at different temperatures. The temperature dependent frequencies of the longitudinal and transverse optical phonon have been obtained from the real part of optical conductivity and the loss function respectively. A small Drude component is observed at frequency below 300 cm^-1 which could arise from Li ions or oxygen deficiencies. The ionicity of LiGaO2 has been studied from the analysis of the Born effective charge of different ions.     

VARIATIONAL PROPERTIES OF THE INTEGRATED MEAN CURVATURES OF TUBES IN SYMMETRIC SPACES

61. IntroductionLet P be a submanifold of an n-dimensional riemannian manifold AI. Expressions fOrthe kth integrated mean curvatures, M^P(t), (i. e. the integral of tho kth mcan curvature,k = 0, 1,' l n -- l), of a tubular hypersurface P of radius t about P, in terms of theRiemann curvature tensor of P. are calculated when AI is Euclidean or a rank one symmetricspace[5'13"1. Moreover, when P is a closed convex hypersurface of thc n-dimensional spaceof constant curvature A', Santal6 has…     

ON THE GENERALIZED GLAISHER－HONG‘S CONGRUENCES

51. Notations and IntroductionListed below are some general notations which wi1l be used thIoughout this note:pea prime number greater than 3,cl l, mt r, s E N,(:) = n!/(kl(n -- k)!)--the binomial coefficient,Bk--the kth Bernoulli number in the "even suthe" notation, e.g., Bo = 1, B1 =--1/2, B2 = 1/6, B3 = 0,',B.(x) = Z (:)Bkx"--*--the Bernoulli polynomial.k=0As is known, the Bernoulli numbers are defined by the symbolic recurrence relationB.+l = (B + 1)"+', n = 1, 2,', Bo = l, whic…     

ON NONLINEAR DIFFERENTIAL GALOIS THEORY

This Is an accom ofa work In course ofprogress．The aim Is the following:     

为在巴西引入数字电视提交的"公开咨询报告"文稿第291号

1 引言 由"国家电信局"(National Telecommunications Agency,Anatel)主持的数字电视在巴西的首次"公开咨询报告"(Public Consultation)的一年后,我们注意到:在这种技术的领域内,已经出现很多不同的显著事实.除了"CPqD基金会"报告以外,新的对比性测试曾经在美国(ATSC对DVB-T)和中国香港(ATSC,DVB-T和ISDB-T)都进行过.还有一些报道表明:中国台湾也进行了对比性测试,目的是确立自己的数字电视标准.     

用SEAS驱动器的传输线音箱(一)

１THOR优良的传输线音箱欣赏传输线音箱（Transmission－Line简称TL）的人很少。本质上,它没有共振箱,而能产生深沉的、能很好控制的低音响应。对于一个给定的驱动器,TL的低频响应能下潜到低于用相同驱动器的开口箱或密闭箱所产生的低频下限。在数百Hz以上频率时,填充传输线内的材料能完全吸收驱动器背后的声波,使TL给出一种开放而无箱式音箱的那种放音。遗憾的是,由于缺乏好的设计理论,相对于传统的开口式和密闭式箱体来说,箱体制造比较复杂,所以TL并没有得到广泛的商业普及。但是,最近由G．L．Augspurger发表在参考文献…     

The New Fault Tolerant Onboard Computer for Microsatellite Missions

1IntroductionWith the space technology developing,much moreCommercial-Off-The-Shelf(COTS)devices are used inmicrosatellites that are mostlylocatedin Low Earth Or-bit(LEO)[1~3].The COTS devices have relatively lowpower consumption,high processing performan…     

A Novel Self-Synchronization Scheme Based on Cross Gain Modulation and Self-Frequency Shift in an SOA

1Introduction and BackgroundSelf-synchronization acts as a vital role in ultrafastOptical Ti me Division Multiplexing(OTDM)[1~3]packet networks.Self-synchronization is promising toperformpacket-level clock recovery,which i mplementsstreamcapture by detect…     

A New Signature Scheme with Shared Verification

1Introduction Withthedevelopmentofcomputerandnetworkcom municationtechnology,andwiththedifferenceofuser s demands,digitalsignaturetechniquesarebeingexpand edgreatly,fromthesinglesignature,singleverification modetothemulti user sone.Forexample,adocument sy…