2008 IEEE International Frequency Control Symposium最新文献_第10页

Monitoring cell adhesion and characterizing cell viscoelasticity by using thickness shear mode (TSM) resonate sensor 利用厚度剪切模式(TSM)共振传感器监测细胞黏附和表征细胞粘弹性

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623020

Fang Li, Qing-Ming Wang, J.H.-C. Wang

{"title":"Monitoring cell adhesion and characterizing cell viscoelasticity by using thickness shear mode (TSM) resonate sensor","authors":"Fang Li, Qing-Ming Wang, J.H.-C. Wang","doi":"10.1109/FREQ.2008.4623020","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623020","url":null,"abstract":"Cell adhesion and mechanical properties are critical to physiological and pathological processes. Regulation of cell adhesion states is involved in tissue remodeling during morphogenesis and wound healing, cellular metaplasia, cell proliferation and tumor cell metastasis. Cell mechanical properties play an essential role in cell deformation under mechanical forces and other cell functions such as locomotion and cytokinesis. Because of the dominance of the cytoskeleton in cell structure and properties, measurement of the cell viscoelastic properties provides an effective approach to look into cytoskeleton, which plays an important role in cell growth, gene expression, protein synthesis, differentiation, migration and apoptosis. In this study, a functional biosensor system, which consists of acoustic wave biosensor array, cell culture, a mini-incubator, an impedance analyzer and a computer, was established to monitor cell adhesion and viscoelastic properties under controlled biological conditions. A multilayer acoustic wave sensor model that includes the thickness shear mode quartz resonator substrate, a cell-substrate interfacial layer and a cell layer in cell culture medium was constructed based on the state of cell adhesion to the substrate, which can be applied to predict the relationship between the resonant frequency and resistance change of the biosensor and physical properties of the interfacial layer and the cell layer. Experimentally, the dynamic processes of cell adhesion as function of cell seeding densities have been investigated. Using the theoretical model, the viscoelastic properties of cell layer are extracted by fitting the theoretical values of the resonator admittance near resonance with the measured spectrum. The results agree very well with the data obtained by other techniques.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126282603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Orthogonal frequency coded SAW sensors and RFID design principles 正交频率编码SAW传感器和RFID的设计原理

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623004

D. Malocha, J. Pavlina, D. Gallagher, N. Kozlovski, B. Fisher, N. Saldanha, D. Puccio

{"title":"Orthogonal frequency coded SAW sensors and RFID design principles","authors":"D. Malocha, J. Pavlina, D. Gallagher, N. Kozlovski, B. Fisher, N. Saldanha, D. Puccio","doi":"10.1109/FREQ.2008.4623004","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623004","url":null,"abstract":"Orthogonal frequency coded (OFC) SAW reflectors and transducers have been recently introduced for use in communication, sensor and RFID tag applications.[1,2] The OFC SAW technology approach has been funded by NASA for possible inclusion in ground, space flight and space exploration sensor applications. In general, SAW technology has advantages over possible competing technologies: passive, wireless, radiation hard, operation from cryogenic to furnace temperature ranges, small, rugged, variable frequency and bandwidth operation, encoding and commercially available. SAW sensor embodiments can provide onboard device sensor integration, or can provide integration with an external sensor that uses the SAW device for encoding the sensor information and transmission to the receiver. SAW OFC device technology can provide RFID tags and sensors with low loss, large operating temperatures and a multi-use sensor platform. This paper will discuss the key parameters for OFC device design, which include reflector and transducer design, coding diversity approaches, and insertion loss considerations. Examples of several OFC device sensors and RFID tags will be presented to show the current state-of-the-art performance for several NASA applications, as well as projections for future sensor and RFID tag platform performance.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125927554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

A new anti-collision method for SAW tags using linear block codes 基于线性分组码的SAW标签防碰撞新方法

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623005

M. Brandl, Stefan Dipl.-Ing. Schuster, S. Scheiblhofer, A. Stelzer

引用次数: 16

Lumped element equivalent circuit for shear piezoelectric cylindrical resonators 剪切压电圆柱谐振器的集总元等效电路

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623069

P. Kielczynski, M. Szalewski

引用次数: 0

A compact optical bench for laser cooling 一种用于激光冷却的紧凑型光学工作台

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622970

S. Perrin, F. Esnault, D. Holleville, S. Guérandel, N. Dimarcq, V. Ligeret, J. Delporte

引用次数: 0

Stress control in AlN and Mo films for electro-acoustic devices 电声器件用AlN和Mo薄膜的应力控制

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623076

V. Felmetsger, P. Laptev

{"title":"Stress control in AlN and Mo films for electro-acoustic devices","authors":"V. Felmetsger, P. Laptev","doi":"10.1109/FREQ.2008.4623076","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623076","url":null,"abstract":"Piezoelectric AlN films with strong (002) crystal orientation are widely used in various resonator-based applications such as BAW and FBAR filters, oscillators and resonating sensors. Low intrinsic stress is one of the important requirements for the thin film stacks employed in electro-acoustic devices. In this paper, we describe technical and technological solutions enabling effective stress control in piezoelectric AlN films deposited with an ac (40 kHz) reactive sputtering process by a dual cathode S-Gun magnetron, and in Mo electrodes deposited by a DC powered S-Gun. In the AC powered S-Gun, a special stress adjustment unit reduces compressive stress in the AlN films by controllably suppressing the flux of charged particles to the substrate by means of discharge current redistribution between the targets and the internal shields of the magnetron. Tensile stress in the AlN and Mo films is effectively reduced by performing the thin film depositions with added rf substrate bias. To avoid texture deterioration in the Mo films deposited with RF biasing, a two-step deposition process has been developed ensuring formation of superior crystal orientation as well as near-zero or, if required, compressive stress in the Mo films. Formation of a well-textured Mo bottom electrode enables growth of highly c-axis oriented AlN films.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130567821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Optical lattice clocks with non-interacting bosons and fermions 具有非相互作用玻色子和费米子的光学晶格钟

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.2184/LSJ.36.1004

H. Katori, M. Takamoto, T. Akatsuka, H. Hachisu

引用次数: 102

A new method to increase loaded Q of extremely low phase noise SAW oscillator 一种提高极低相位噪声SAW振荡器负载Q值的新方法

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622983

T. Imaike, Y. Sakuta, Y. Sekine

引用次数: 0

Multi-mode excitation of electromagnetic-acoustic resonant sensor arrays 电磁声谐振传感器阵列的多模激励

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622955

F. Lucklum, B. Jakoby

引用次数: 5

An analysis of propagation of surface acoustic waves in rotating piezoelectric plates 表面声波在旋转压电板中的传播分析

2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622977

Ji Wang, R. Wu, Jianke Du, Dejin Huang

{"title":"An analysis of propagation of surface acoustic waves in rotating piezoelectric plates","authors":"Ji Wang, R. Wu, Jianke Du, Dejin Huang","doi":"10.1109/FREQ.2008.4622977","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4622977","url":null,"abstract":"As an important application of acoustic wave sensors, gyroscopes for rotation sensing purpose can also utilize surface acoustic waves in piezoelectric substrates. This requires an analysis of surface acoustic waves propagating in finite piezoelectric solids to aid the design process in parameter selection and optimization. Earlier studies have investigated the effect of rotation in semi-infinite piezoelectric solids, but result like this can only be considered as an approximation to actual gyroscopes with finite substrates. In this study, we consider the substrate as an infinite piezoelectric plate with finite thickness, thus enabling us to calculate the surface acoustic wave velocity in a rotating plate. It is known that there is only one velocity in a semi-infinite solid, but there will be two velocities if we study surface waves in an infinite plate. It is also found that both velocities are changed by the rotation. The numerical results on AT- and ST-cut quartz crystal show that both velocity branches have been changed and the two velocities can be clearly observed if the thickness of plate is less than three wavelengths. If the substrate is to be considered as a semi-infinite, the plate thickness has to be larger than three wavelengths. In this case, the effect of rotation on the velocity still exists, but the two modes essentially merged into the Rayleigh wave velocity. The velocity shifts due to rotation is different from the semi-infinite substrate, offering improved references and guidance in the substrate and material selection for rotation piezoelectric sensors. The extension of this study can be done with the application of two-dimensional theory for surface acoustic waves in finite plates.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132797267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2