检索结果-南通市图书馆

AlScN films prepared by alloy targets and saw device characteristics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第3期41卷 434-439,I0004页

作者： Kuo Men Hao Liu Xingquan Wang Qian Jia Zhaochong Ding Huating Wu Daogao Wu Yuhua Xiong State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101402China State Key Laboratory of Non-ferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIKIN Advanced Material Co.Ltd. Beijing 100220China GRIREM Advanced Materials Co.Ltd. Beijing 100088China

In this paper,we reported a surface acoustic wave(saw)device prepared and optimized by piezoelectric films containing AIN,AIScN(Sc-20 at%)and AIScN(Sc-30 at%)by reactive magnetron sputtering using Al and AISc alloy *** calculated the material intrinsic electromechanical coupling coefficient k_(t)^(2) of AlScN(Sc-20 at%)and AlScN(Sc-30 at%)which are much better than *** can be explained by the lattice ***,the results were confirmed by transmission electron microscopy(TEM)observation of the *** the saw devices based on three thin films were tested by vector network analysis obtaining the device equivalent electro mechanical coupling coefficient k_(eff)^(2).The value of AIScN(Sc-20 at%)k_(eff)^(2),which equals to 1.94%,is higher than that of AIN and AIScN(Sc-30 at%)while the value of AIScN(Sc-30 at%)k_(t)^(2) is higher than that of *** is shown in our study that the crystallinity and orientation of the material still have a greater impact on k_(eff)^(2) but it does not have influence on k_(t)^(2) in the actual device preparation process.

关键词： AlScN film Alloy targets saw Electromechanical coupling coefficient k_(t)^(2) Crystallinity Orientation

Embedding epitaxial VO_(2)film with quality metal-insulator transition to saw devices

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2022年第5期12卷 53-59页

作者： M.E.Kutepov §,G.Ya.Karapetyan T.A.Minasyan V.E.Kaydashev I.V.Lisnevskaya K.G.Abdulvakhidov A.A.Kozmin E.M.Kaidashev Laboratory of Nanomaterials Southern Federal University200/1 Stachki Ave.344090 Rostov-on-DonRussia Department of Chemistry Southern Federal University7 Zorge St.344090 Rostov-on-DonRussia Smart Materials Research Institute Southern Federal University178/24 Sladkova St.344090 Rostov-on-DonRussia

Epitaxial VO_(2)films grown by pulsed laser deposition(PLD)method with superior phase transition related switching characteristics are successfully embedded to saw devices using concept of the“impedance loaded saw sensor”.A resistance of VO2 sensor abruptly drops from 0.7 MΩto 90Ωwhen it is heated above~65℃and shows a narrow hysteresis loops when *** designs of saw devices are examined in which RF signal is reflected back from interdigital transducer(IDT)or a surface acoustic waves(saw)is transferred through a coupler and the RF response is altered 2 and 3 times correspondingly upon the phase transition in *** the proposed devices with external load,a saw does not propagate via VO2 film and therefore is not attenuated which is beneficiary for wireless ***,a saw phase shift as great as 50°is induced to the saw transferred through the coupler due to the phase transition in *** proposed approach may boost the development of remotely controlled autonomous sensors,including those based on VO2 metamaterials and hybrid plasmonic structures for near IR/middle IR and sub-THz/THz applications.

关键词： Surface acoustic wave saw pulsed laser deposition PLD VO_(2) epitaxial film.

saw reflection and scattering by electrodes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第9期6卷 997-1003页

作者：王为标韩韬张晓东吴浩东水永安 State Key Laboratory of Modern Acoustics Nanjing University Department of Instrumentation Engineering Shanghai Jiao Tong University Shanghai 200030 China

A rigorous analysis of surface acoustic wave (saw) reflection and scattering by electrodes is of paramount impor- tance in the design of saw identification tags and sensors. In this paper, a new method based on Green’s function concept is used to study reflection and scattering coefficients. By this method the reflection coefficient with its phase angle, transmission coeffi- cient, and bulk wave scattering coefficient, can be obtained rapidly and accurately. To get precise result, the influence of static charge must be taken into account. In the work, we successfully cancelled out the effect of static charge and the validity of the results was checked. As an example, the reflection, transmission and scattering coefficients of a single grounded electrode on 128° YX LiNbO3 is shown.

关键词：表面声波 saw 电极反射现象散射现象 Green函数

Study of a ZnO/36° LiTaO_3 saw Biosensor with Gold Sensitive Layer

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 327-329页

作者： K.Kalantar-zadeh W.Wlodarski V.Vojisavljevic E.Pirogova I.Cosic S.Kandasamy School of Electrical & Computer Engineering RMIT UniversityMelbourne VIC 3001Australia

The mass sensitivity of a layered surface acoustic wave (saw) device,ZnO/36°LiTaO_3,has been *** layers of different thicknesses were deposited to form the protein-sensitive layer,in order to compare the responses to biological materials and to find the optimum thickness of the gold thin *** of the device was investigated by immobilization of lactate dehydrogenase (LDH) onto the device active area.

关键词： ZnO LiTaO3 saw biosensor gold lactate dehydrogenase

saw chirp Fourier transform for MB-OFDM UWB receiver

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 1-4页

作者： HE Peng-fei LUE Ying-hua ZHANG Hong-xin WANG Ye-qiu XU Yong Institute of Telecommunication and Network Technology Beijing University of Posts and Telecommunications Beijing 100876 China

In the conventional multiband orthogonal frequency division multiplexing ultra wideband （MB-OFDM UWB ） receiver, the fast Fourier transform （FFT） algorithm is realized by the expensive and power-consuming digital signal processor （DSP） chips. In this article, the lower power, lower cost, and lower complexity real-time analog surface acoustic wave （saw） chirp Fourier transform devices were used to replace the DSP part. A MB-OFDM UWB receiver based on the M-C-M saw chirp Fourier transform was presented, and the step of signal transformation from input signals was also depicted. The simulation results show that the proposed receiver provides similar bit error performance compared to the fully digital receiver when used in the channel environments proposed by the IEEE 802.15SG3a.

关键词： MB-OFDM UWB saw chirp Fourier transform

Research progress in saw filter banks

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第9期6卷 990-996页

作者：何世堂 Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China

saw (Surface Acoustic Wave) filter bank is a single input, single or multi-output device consisting of multi-saw-filters with input interconnection network or switch circuits, and can be divided into two categories: channelizer (multi-output) and switchable (programmable, single output). The former is mainly used in military channelized receiver for spectrum analysis; the latter has wide application in frequency synthesizer and frequency-hopping radar and communication system receiver as anti-jamming filter, and has been widely used in various military electronic equipments ever since the 1970s. Research abroad was done mainly by Americans, few documents on related work done by Japan and Russia are available. Do-mestic research started in the 1980s, mainly by No. 26 Research Institute, China Electronics Technology Group Co., Institute of Acoustics, Chinese Academy of Sciences, No. 23 and No. 25 Research Institute, China Spaceflight Tech. Group Co. This paper first briefly introduces Chinese and foreign research on saw filter banks; then discusses research progress in device design, the input interconnection network or switch circuit and miniaturization; and ends in a brief perspective of developing trends in future.

关键词：表面声波 saw 过滤层信号输入开关电路

Influences of magnetic treatment on microstructure densification of diamond saw segments

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2008年第S2期15卷 267-272页

作者：翟富刚张燕玲李娟张庆 College of Mechanical Engineering Yanshan University

The heated test pieces were treated with alternating magnetic field by self-made experimental facility firstly. And influences of magnetic treatment on microstructure densification of Diamond saw Segments were studied through hardness testing, ultrasonic testing, metallurgical structure and fracture pattern analysis by comparative method. The mechanism of magnetic treatment is analyzed and discussed in the end. The results show that the hardness of test pieces after magnetized are harder than before, that HRB hardness is improved by 3.58 on average. The sound path and amplitude of echo wave both decrease in test pieces after magnetized. The relative pad value of echo wave is regularly related with the microstructure densification, what is profound to further establish the regularity studying the degree of matrices densification using ultrasonic testing. The pores become few and pore shape gradually spheroidizing with the magnetic treatment, and matrices are more homogeneous and compact than the without by metallographic microscope. The degree of matrices densification is further improved after magnetized. The average crystal grain size is finer than the without, and the reason of grain refining is that densification of diamond saw blade improved. Magnetic treatment can act as one kind of effective technique to improve the microstructure densification of diamond saw segments.

关键词： magnetic treatment diamond saw segment microstructure densification

Statically Analysis of the Stress State of saw Gins Consisting of 90, 100, 110, 120, 130 saws

在线全文

学校读者我要写书评

暂无评论

Engineering（科研） 2022年第8期14卷 329-338页

作者： Azizov Shuhrat Mamatovich Uzoqov Farxodjon Shermuhammad Alijonov Hasanov Ahmadjon Mirzakarimov Mirsharofiddin Department Technological Machines and Equipment’s of Namangan Institute of Engineering and Technology 1 Namangan Uzbekistan

In the primary processing of cotton, it is important to increase the productivity of ginning and reduce the wear of working bodies. The working body of the genie is the working chamber, the saw cylinder and the rib grate. The main wear is on the saw cylinder shaft and saw teeth. The wear of these parts leads to additional material costs, as well as to a decrease in the quality of the fiber. The wear of the shaft is affected by the number of saws and the mass of raw cotton in the working chamber of the gin. To prevent wear of the saw cylinder, the article determines the optimal static load on the shaft by calculating saw gins consisting of 90, 100, 110, 120, 130 saws. An analysis of tables shows that maximum value to bending shows 120 and 130 saws cylinder, because shaft bending angles along the length appear. This leads to a 2% - 3% reduction in the distance between the saws, serves for the premature wear of the saw, the exit of short fibers.

关键词： Raw Cotton Shaft Statically Analysis saw Gin

Development of Raman acousto-optic frequency shifter based on saw

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2014年第8期35卷 104-109页

作者：王春梅温志渝张祖伟张颖异 Key Laboratory of Fundamental Science on Micro/Nano-Device and System Technology Chongqing University National Center for International Research of Micro/Nano-System and New Material Technology Chongqing University Microsystem Research Center of Chongqing University

A Raman acousto-optic frequency shifter （AOFS） based on surface acoustic wave （saw） is presented. It consists of a double-ended saw resonator and optical waveguide system. The structure parameters of the saw resonator are optimized using COM software and the optical waveguide system is designed using an effective index method. The AOFS prototype fabricated using MEMS technology is detected. The optical beat signals su- perimposed by ± 1st-order and ±2nd-order diffracted beams are detected. The frequency shift of 78.2201 MHz related to the 1 st-order diffracted beams and 156.2306 MHz related to the 2nd-order diffracted beams are obtained respectively.

关键词： saw Raman AOFS frequency shift