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Test and contrast frequency stability on integrated resonator Frequency stability on integrated resonator of different electrode material At room temperature, the wafer is in free mode, we test frequency stability of the quartz crystal resonator of different electrode material, Cu, Al and Au, with the frequency stability tester XHTF3597.
Combined the energy trap theory of crystal vibration with ANSYS simulation, designed integrated quartz resonators have different the frequency stability when their structures and electrode materials are different; with the increase of the thickness of the electrode, oscillation stability of the resonator is improved; the stability of Au-electrode resonator is better than that of Cu, Al-electrode resonator; resonator of asymmetric structure has better frequency stability than that of symmetric structure.
This shows that the electrode material, thickness and structure of the resonator have a certain influence on frequency stability of integrated resonator.
Acknowledgment This work was supported by National Natural Science Foundation of China (61072004, 60968001), Beijing Natural Science Foundation (4082011, 4122030), Foundation of PHR(IHLB)(PHR200906132) , Scientific Research Key Program (KZ201110772040), Education and Teaching & Undergraduate Scientific Research Program of Beijing Municipal Commission of Education(PXM2012-014224-000055).
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Hydroxyapatite powders (HA) were synthesized by the precipitation technique using starting materials of Ca(NO3). 4H20 and (NH4)2 HPO4 .
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Pap1,a, Zsolt Nényei2, Gábor Battistig 1 and István Bársony 1 1 Research Institute for Technical Physics and Materials Science MFA, Hungarian Academy of Sciences, Budapest, P.O.Box 49, H-1525 Hungary 2 Mattson Thermal Products, Daimlerstr. 10, D-89160 Dornstadt, Germany a pap@mfa.kfki.hu Keywords: Deuterium passivation, heavy water, wet chemical cleaning, gas phase, Si native oxid Introduction The well known wet chemical treatments of the silicon surface and its native oxidation in air cause a high density of interface states, which predominantly originate from dangling bonds strained bonds or from bonds, between adsorbates and silicon surface atoms.
Note the applied optical model is an N2 carrier gas and vapor mixture - in Mixture bottle of HF and H2O / D2O Tap Tap Gas out N2 carrier gas - in Sample holder Si wafer approximation in which literature data of the bulk materials were applied.
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Introduction Emission and accumulation of phenolic materials in soil and water cause the deterioration of environment, so these compounds are listed as priority pollutants of environ-mental control in many countries.
Materials and Methods Strain Source and Culture Medium.
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Introduction With the development of science and technology and the fast development of modern industry, the demand to deep hole parts is increasing.
SFD is consisted of damping journal and workpiece.
Clearance between damping journal and workpiece is full of damping fluid.
The workpieces is HT250, diameter is 100 mm and depth is 800 mm. damper materials is powder alloy.
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Teachers can apply teaching software or multimedia materials, compile their PowerPoint or multimedia courseware to illustrate the structure of teaching clearly and demonstrate the contents of mathematics teaching vividly.
The interaction between education technology and information technology create vivid learning environment, in which mathematic problems are shown by means of video, compact discs and computer software, so mathematic materials are made vivid and visual.
It is the unification of education science, psychology and education technology, and the integration of teachers and students, education contents and technologies in the teaching system.
Journal of Changchu Teachers College(Science Edition).(2008) [3] Fu Hongxia.
Journal of Jiangxi Institute of Education(General Edition).(2008)