SAW Applications Research Articles

Comparative Analysis of the Application of AHP and SAW in the Selection of the Best Employees at the Main Samsat Office, Samarinda City.

Employees are a supporting factor in a company or agency, because with employeeswho have company qualification standards, the company's productivity will be maintained and will increase. The AHP and SAW methods can be used to determine the best employees. There are 3 criteria and 16 alternatives that are given a value based on the scale of importance and weight for each criterion that has been determined by the Samarinda City Samsat Main Office which will be processed to find a sensitivity value using two methods, namely AHP and SAW. By carrying out the calculation process as much as 6 times the weight addition experiment where each weight is added to the value of 0.5 and 1 which is applied to the two AHP and SAW methods produces the sensitivity values of the two methods and uses two experiments with the first formula (XA – XB) and ( XA + XB ) then the sensitivity value obtained from the first trial of the AHP method is - 2.592705356 and the sensitivity value of the SAW method is -4.522690058. The second experiment added the value (XA + XB) so that the results of the sensitivity values of the two methods were obtained, namely AHP 5.952672848 and SAW method 8.358567251. From the calculations of these two methods, the SAW method was chosen which is more sensitive, so the best employee with the highes score at the Samsat Main Office, Samarinda City, was A1, namely the Selvi Salamah alternative, with a priority value of0.944444444.

Introduction of Passive Wireless SAW Temperature Sensors and Application

Introduction of Passive Wireless SAW Temperature Sensors and Application

Application of SAW and TOPSIS in Prioritizing Watersheds

Prioritization of watersheds for conservation measures is essential for a variety of functions, such as flood control projects in which the determination of top priority areas is an important management decision. The purpose of this study is to examine watershed morphological characteristics and identify critical sub-watersheds, which are prone to be damaged, using Remote Sensing/Geographical Information Systems (GIS) and SAW/TOPSIS (Simple Additive Weighting/ Technique for Order of Preference by Similarity to Ideal Solution). Fourteen morphometric parameters were chosen to organize sub-watersheds using SAW/TOPSIS, which examines sub-watersheds (as susceptible zones) from the perspective of classification in four priority levels (namely, low, moderate, high and very high levels). The SAW/TOPSIS approach is a useful strategy to find out potential zones provided that the ultimate goal is to achieve successful management strategies, particularly in particular zones where information accessibility is limited and soil assorted variety is high. Without facing with high cost and exercises in futility, sub-watersheds could be organized through morphometric parameters in executing conservational measures to save soil and the earth at the same time. In short, our results showed that morphometric parameters are highly efficient in identifying erosion-prone areas.

Resonant acoustic wave assisted spin-transfer-torque switching of nanomagnets

We report the possibility of achieving an order of magnitude reduction in the energy dissipation needed to write bits in perpendicular magnetic tunnel junctions by simulating the magnetization dynamics under a combination of resonant surface acoustic waves (r-SAWs) and spin-transfer-torque (STT). The magnetization dynamics were simulated using the Landau-Lifshitz-Gilbert equation under macrospin assumption with the inclusion of thermal noise. The resonant magnetization dynamics in the magnetostrictive nanomagnet builds over few tens of cycles of SAW application that drives the magnetization to precess in a cone with a deflection of ∼45° from the perpendicular direction. This reduces the STT current density required to switch the magnetization direction without increasing the STT application time or degrading the switching probability in the presence of room temperature thermal noise. This could lead to a pathway to achieve energy efficient switching of spin-transfer-torque random access memory whose lateral dimensions can be scaled aggressively despite using materials with low magnetostriction by employing SAW excitation to drive ferromagnetic resonance.

Czochralski crystal growth and characterization of large langatate (La3Ga5.5Ta0.5O14, LGT) crystals for SAW applications

1.5 and 2 inch LGT, langatate (La3Ga5.5Ta0.5O14) crystals along the X[100], Y[120] and Z[001]-directions were successfully grown by the Czochralski technique.

Application of Diamond Wire Saw Cutting in Demolition of Large Reinforced Concrete Members

With the rapid development of construction engineering and densely populated of urban buildings, it is impossible to adopt traditional methods for demolition construction due to the constraints of the surrounding environment. This paper combines the demolition engineering practice of the foundation pit support system of Jinyuan International Plaza, expounds the superiority of the application of diamond wire saw cutting in the demolition of large reinforced concrete members, and puts forward the effective construction operation points, which can provide beneficial for similar projects reference.

MODEL PENGELOLAAN FISKAL RASUL SAW DALAM KONTEKS PENGELOLAAN FISKAL KOTA PALEMBANG

This study aims to find out the model of the fiscal application of Rasul SAW in the context of the fiscal management of Palembang City Province. This research was conducted in two stages. Phase I, namely describing Rasul SAW's fiscal management model and implemented it in the management of the fiscal city of Palembang and its implications for the level of security and welfare of the people of Palembang city. Phase II, namely the development of Rasul SAW's fiscal management model, became the model rule for the fiscal management of Palembang city. Fiscal management includes the use of government spending, taxation, and loans to achieve the desired goals in building a country, fiscal management becomes the main tool for the state for welfare, this management is applied by the Prophet Muhammad in Medina. The Prophet Muhammad's fiscal resources consisted of Zakat, Ghanimah, Kharaj, Jizyah, and other sources burupa Usyir. The position of fiscal management plays an important role in the Islamic economic system compared to monetary management, with the prohibition on usury and obligations regarding the importance of fiscal position compared to monetary. The economic and fiscal system applied to the government of Palembang City refers to the policies contained in the Pancasila, the Act, and government regulations both the central government and regional government regulations. The fiscal becomes regional original income (PAD) sourced from; (1) Results of regional tax collection; (2) Regional retreat; (3) Management of regional wealth 4) and others.

Quality improvement in submerged arc welding process using taguchi method and regression analysis

Welding process for joining similar and different materials is one of the economical and is a much faster process of joining. Because of its reliability, submerge arc welding is one of the chief metal joining process employed in industry. With the proper selection of equipment, submerge arc welding can be applied to a wide range of industrial applications. The high quality of welds, the high depositional rates, the deep penetration and the adaptability to automatic operation makes it the process particularly suitable for fabrication of large weldments. The quality of SAW is mainly influenced by independent variables such as welding current, voltage, and travel speed and electrode stickout. The automation of SAW application is often desirable due to somewhat unpleasant working condition that the process creates. The application of Taguchi techniques and regression analysis to determine the optimal process parameters for the submerge arc welding and the quality improvement. The quality engineering method of Taguchi employing of experiment provides are efficient and systematically way to optimise design for performing, quality and cost. It is one of the most important statical tools for designing high quality system at reduced cost. The use of Taguchi method simplifies the optimization procedure for determining the optimal welding parameter in the submerge arc welding.

Enhanced c-axis orientation of aluminum nitride thin films by plasma-based pre-conditioning of sapphire substrates for SAW applications

Aluminum nitride (AlN) on sapphire has been investigated with two different pretreatments prior to sputter deposition of the AlN layer to improve the orientation and homogeneity of the thin film. An inverse sputter etching of the substrate in argon atmosphere results in an improvement of the uniformity of the alignment of the AlN grains and hence, in enhanced electro-mechanical AlN film properties. This effect is demonstrated in the raw measurements of SAW test devices. Additionally, the impulse response of several devices shows that a poor AlN thin film layer quality leads to a higher signal damping during the transduction of energy in the inter-digital transducers. As a result, the triple-transit signal cannot be detected at the receiver.

Zinc oxide flakes-corolla lobes like nano combined structure for SAW applications

Novel ZnO combined structures were obtained using the radio frequency (RF) sputtering method. The effects of two different substrates, Si and 128° YX LiNbO3, on the structural, morphological, and optical properties of ZnO films were investigated. Field emission scanning electron microscopy clearly revealed the formation of a mixed flake-corolla lobe-like structure. The grain size of the obtained structure depended on the substrate type. Two different X-ray diffraction peaks were obtained for ZnO growth on LiNbO3, at the (200) and (201) diffraction planes, respectively.

A promising method to derive the temperature coefficients of material constants of SAW and BAW materials. first application to LGS.

Langasite (LGS) is a promising material for SAW applications at high temperature. However, the temperature coefficients of LGS material constants are not accurate enough to perform reliable simulations, and therefore to make good use of available design tools, above 300°C. In the first part of the paper, we describe a new possible way to derive these coefficients in a wider temperature range. The method is based on Simulated Annealing, a well-known optimization algorithm. The algorithm converges toward a set of optimized temperature coefficients of the stiffness constants which are used to perform accurate simulations up to at least 800°C. In the second part, a deeper analysis of the algorithm outputs demonstrates some of its strengths but also some of its main limitations. Possible solutions are described to predict and then improve the accuracy of the optimized coefficient values. In particular, one solution making use of additional BAW target curves is tested. A promising solution to extend the optimization to the temperature coefficients of piezoelectric constants is also discussed.

A numerical method to derive accurate temperature coefficients of material constants from high-temperature SAW measurements: application to langasite

The design of wireless SAW sensors for high-temperature applications requires accurate knowledge of the constitutive materials' physical properties in the desired temperature range. In particular, it is crucial to use reliable temperature coefficients of the stiffness, piezoelectric, dielectric, and expansion constants of the propagation medium to achieve correct simulations of the considered devices. Currently, the best-suited piezoelectric material for high-temperature SAW applications is langasite (LGS). Unfortunately, the available coefficients do not allow for precise prediction of the temperature dependence of LGS-based SAW devices above 300°C. A novel method, based on a simulated annealing algorithm coupled with a Rayleigh wave simulation program, was developed to find optimal LGS temperature coefficients. This approach has proven to yield accurate results up to at least 800°C.

Effects of Mn‐doping on surface acoustic wave properties of ZnO films

AbstractSurface acoustic wave (SAW) filters based on Mn‐doped ZnO films have been fabricated and effects of Mn‐doping on SAW properties are investigated. It is found that the electromechanical coupling coefficient (K2) of Zn0.913Mn0.087O films is 0.73 ± 0.02%, which is 73.8% larger than that of undoped ZnO films (0.42 ± 0.02%). Zn0.913Mn0.087O film filters also exhibit a lower absolute value of insertion loss (|IL|) of 16.1 dB and larger bandwidth (BW) of 5.9 MHz compared with that of undoped ZnO film filter. However, Zn0.952Mn0.048O film filters exhibit a smaller K2 of 0.34 ± 0.02%, larger |IL| of 26.9 dB and smaller BW of 3.5 MHz. It is suggested that the SAW properties can be improved by appropriate Mn‐doping and Mn–ZnO/Si multilayer structure with large d33 is promising for wide‐band and low‐loss SAW applications. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Investigations on AlN/sapphire piezoelectric bilayer structure for high-temperature SAW applications

This paper explores the possibility of using AlN/sapphire piezoelectric bilayer structures for high-temperature SAW applications. To determine the temperature stability of AlN, homemade AlN/sapphire samples are annealed in air atmosphere for 2 to 20 h at temperatures from 700 to 1000°C. Ex situ X-ray diffraction measurements reveal that the microstructure of the thin film is not affected by temperatures below 1000°C. Ellipsometry and secondary ion mass spectroscopy investigations attest that AlN/sapphire is reliable up to 700°C. Beyond this temperature, both methods indicate ongoing surface oxidation of AlN. Additionally, Pt/Ta and Al interdigital transducers are patterned on the surface of the AlN film. The resulting SAW devices are characterized up to 500°C and 300°C, respectively, showing reliable frequency response and a large, quasi-constant temperature sensitivity, with a first-order temperature coefficient of frequency around -75 ppm/°C. Between room temperature and 300°C, both electromechanical coupling coefficient K(2) and propagation losses increase, so the evolution of delay lines' insertion losses with temperature strongly depends on the length of the propagation path.

집중 소자를 이용한 표면 탄성파 장치 기반의 용량 성 센서 보정 및 이를 이용한 초정밀 간극 측정

SAW device is widely used as filters, sensors, actuators in various technologies. And capacitive sensor is tremendously used to measure pressure, gap, etc. The application of SAW device as signal conditioner of capacitive sensor reduces noise level and enables high precision measurement. The response increase of SAW based capacitive sensor is produced just before the two capacitive electrode contacts by the existence of parasitic resistance of capacitive electrode. In this paper, we analyze the effects of parasitic resistance and propose the calibrating method using lumped component and execute the high precision gap measurement using calibrated system. And xx nm resolution and yy <TEX>${\mu}m$</TEX> stroke was attained.

ZnO nanostructures as sensing element of acoustic wave sensor

In spite of the wide application of SAW devices the investigation of novel sensitive materials, their synthesis methods is continuously carried out. For further quality and accuracy enhancement, simplification of manufacturing and improvement of applying the simulation of novel acoustic wave sensors operation should be performed. In ZnO nanorods-based sensors propagating surface wave imparts following motion to the ends of hydrothermally grown between two interdigitated transducers rod nanostructures: vertical displacement, horizontal displacement and rotations in plane. Thus, response of nanostructured elements to that displacements and kinematic characteristics of Relay waves are evaluated. During the simulation the frequency equation from which we can determine the velocity of propagation of a surface wave for a given geometrical parameters of the rod nanostructures, the values of the density of their distribution on the surface of the half-space and added masses is obtained. This model simplifies the development and analysis of the results from ZnO nanorods-based SAW sensors for biological and chemical agents, including molecules, cells and tissues. Performed simulation extends the range of tools for further development of nanorods-based SAW sensors due to comprehensive math-based explanation of their operating principles

3차원 위빙 대용착 지능 용접캐리지 개발 및 적용

In shipbuilding industry, welding position are usually flat and vertical position at the erection stage. Application of SAW and EGW for these positions makes it possible to achieve enhanced productivity and high quality. But owing to their large size and weight it is difficult to apply these techniques in short and narrow regions. To overcome this problem, our company developed light weight and compact size 4-axis welding carriage which perform 3D weaving. The purpose of this study is to explain the development and application of intelligent welding carriage using 3D weaving pattern that can fill a large amount of welds and thereby making it possible to achieve high quality of welding. This study shows 3D weaving pattern, development of weaving database, and skill of adaptive control response for the variable gap. Also, it shows the results of procedure qualification test for the AH-grade steel when applied to the intelligent welding carriage.

Application of SAW to Determine Priority of Software Requirements

Application of SAW to Determine Priority of Software Requirements

P2-C-11 Unidirectional Interdigital Transducers and Resonators Using Grating SAW Substrates and Application to Low Loss Wide Band Filters

P2-C-11 Unidirectional Interdigital Transducers and Resonators Using Grating SAW Substrates and Application to Low Loss Wide Band Filters

Densificação e evolução microestrutural de cerâmicas Pb0,59Ba0,41Nb2O 6

O niobato de bário e chumbo (PBN) possui uma estrutura cristalina do tipo tungstênio-bronze e apresenta propriedades ferroelétricas muito interessantes tanto do ponto de vista científico quanto do ponto de vista tecnológico, revelando-se como um material bastante promissor para aplicação no desenvolvimento de dispositivos eletro-ópticos, piezoelétricos e piroelétricos. Cerâmicas à base de Pb0(0,59)Ba0,41Nb2O 6 (PBN59) foram preparadas pelo método convencional de mistura de matérias-primas. Duas rotas distintas de densificação de amostras foram utilizadas nesse trabalho: sinterização convencional e sinterização por prensagem uniaxial a quente. As caracterizações microestruturais efetuadas indicaram que as amostras obtidas via prensagem uniaxial a quente apresentam uma distribuição bimodal de tamanhos de grão e elevadas densidades, indicando que essa técnica propicia uma maior eficiência no processo de densificação das amostras. O tratamento térmico pós-prensagem uniaxial a quente induz o macro-crescimento preferencial de grãos orientados.