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951.
掺Eu3+硅基材料的发光性质 总被引:9,自引:5,他引:4
通过溶胶-凝胶技术制备了掺Eu^3 的硅基材料并测试了其三维荧光光谱、激光谱和发射光谱,结果显示,最佳激发波波长为350nm,最强荧光波长为620nm;在350nm光激发下的发射光谱显示Eu^3 的特征发射光谱,产生4条谱带,分别是577nm(^5D0-^7F0),588nm(^5D0-^7F1),596nm(^5D0-^7F1)和610nm(^5D0-^7F2)。 相似文献
952.
953.
We propose a thermodynamic framework for describing the microwave drying process of aqueous dielectrics based on Maxwell-Lorentz Field equations and mixture theory. Several issues are discussed such as the form of entropy equation; the constitutive relations for the macroscopic electric polarization vectors, Cauchy stresses, heat fluxes, internal momentum supplies, etc., for each component of the mixture: porous solid, water and gas in different regions; and the interfacial jump conditions between different regions in the mixture. A brief examination of the status of material frame indifference within the context of our framework is presented. 相似文献
954.
This paper presents the simulation of surface acoustic wave (SAW)-induced absorption coefficient and refractive index change in InGaAs-GaAs multiple quantum well (MQW) structures operating near 980 nm. The exciton problem is solved in two dimensional momentum space to include the non-axial effect due to strain induced valance band mixing and nonparabolicity. The optical absorption coefficient and refractive index changes near the band gap in the MQWs are calculated as a function of SAW power. 相似文献
955.
目的 :探讨高频彩色多普勒超声检查对甲状腺肿块的诊断价值。方法 :对 48例甲状腺包块患者进行二维及彩色多普勒血流显像超声检查。结果 :48例甲状腺包块患者共检出肿块 67个 ,超声检查与病理对照除 3例误诊外 ,其余 45例与病理结果包括肿块部位、数目均符合 ,符合率 90 % ( 42 / 45 )。结论 :高频彩色多普勒超声检查对甲状腺肿块具有较高的诊断价值 ,可为临床提供有价值的诊断依据 相似文献
956.
F. D. Saccone C. E. Rodrí guez Torres F. H. S nchez O. Gutfleisch 《Physica B: Condensed Matter》2002,320(1-4):312-315
In the present work, a quantitative analysis of the phase compositions by Mössbauer effect spectroscopy of solid and conventional hydrogen disproportionated Pr13.7Fe80.3B6.0 and Pr13.7Fe63.5Co16.7Zr0.1B6.0 alloys was carried out. Significant amounts of intermediate borides t-Fe3B and Pr(Fe, Co)12B6 were detected after solid hydrogen disproportionation treatment in Pr13.7Fe80.3B6.0 and Pr13.7Fe63.5Co16.7Zr0.1B6.0 alloys, respectively. After conventional hydrogenation–disproportionation–desorption–recombination treatment these phases were not detected and in no case residual Pr2Fe14B-phase was found. It was observed that the amount of intermediate borides after disproportionation can be correlated with the degree of texture after recombination at various temperatures. 相似文献
957.
Sonya V. Roberson Albert J. Fahey Amit Sehgal Alamgir Karim 《Applied Surface Science》2002,200(1-4):150-164
We present a simple method for chemical modification of chlorosilane self-assembled monolayers (SAMs) on Si surfaces by exposure to a gradient of UV-ozone radiation to create stable substrates with a range of contact angles (θH2O≈5–95°) and surface energies on a single substrate. These gradient energy substrates are developed to potentially generate libraries for combinatorial studies of thin film phenomenology, where a systematic variation of interfacial surface energy represents one of the significant parameters along one axis. The graded oxidation process presents a systematic variation of surface chemical composition. We have utilized contact angle measurements and time-of-flight secondary ion mass spectrometry (ToF-SIMS) to investigate this variation for a series of ions, among which are SiCH3+, SiOH+ and COOH−. We show that the macroscopic measurements of surface free energy/contact angle correlate with the detailed analysis of surface chemistry (as assessed by ToF-SIMS) on these test substrates. 相似文献
958.
959.
Summary Measurements have been made of the sea-level size spectrum of cosmic-ray showers at a number of zenith angles and the relationship
between shower size and atmospheric depth has been derived for a number of integral cosmic-ray fluxes. These measurements
extend the available data to ∼ 1400 g·cm−2 and emphasize the discrepancy between measurements made on Mt. Chacaltaya and those made at other observatories.
Riassunto Sono state fatte misurazioni dello spettro delle dimensioni a livello del mare di sciami di raggi cosmici ad un certo numero di angoli zenitali ed è stata dedotta la relazione tra la grandezza dello sciame e la profondità atmosferica per un certo numero di flussi integrali di raggi cosmici. Queste misurazioni estendono i dati disponibili a∼1400 g·cm−2 ed evidenziano la discrepanza tra le misurazioni fatte sul Monte Chalcaltaya e quelle di altri osservatori.
Резюме Проводятся измерения спектра размеров ливней космических лучей на уровне моря при различных зенитных углах и соотношения между размером ливня и толщиной атмосферы для ряда интегральных потоков космических лучей. Эти измерения уточняют имеющиеся данные до толщии∼1400 г·см−2. Отмечается расхождение между измерениями, проведенными на горе Чакалтайа, и измерениями в других обсерваториях.相似文献
960.
采用从头算CCSD(T)/6-311 G(2d,2p)//B3LYP/6-311G(d,p)方法,研究了自由基-分子反应F CH2CHCH3的各种不同的反应通道.该反应主要是通过复合物形成机制进行,即F分别加到碳碳双键的两端形成自由基复合物1和2.这两种亚稳态自由基会解离成三种产物:H C3H5F、CH3 C2H3F和HF C3H5.理论计算结果表明,生成CH3 C2H3F是反应的主要通道,而生成H C3H5F和HF C3H5对产物也有一定的贡献.这一结果和实验符合得很好. 相似文献