This paper treats the propagation characteristics of magnetoelastic surface waves in a delay line consisting ferromagnetic film deposited on piezoelectric substrate. Magnetoelastic coupling within and mechanical between substrate enables acoustic velocity to be varied by changing magnetic bias field. A theory predict dependence wave upon applied dc field, material constants, frequency is presented. The change occurs predominantly field range where static magnetization vectors are undergoing...

A variable surface acoustic wave (SAW) delay line was fabricated using a thin (<1 μm) magnetostrictive film, metallic-glass overlay. It is well known that metallic-glasses can be prepared in ribbon form by rapid quenching from the melt. However, it difficult to prepare film overlays of these materials for SAW and other devices with this technique. We have succeeded preparing Fe-B co-evaporation. Our measured magnetostrictions magnetizations films are virtually same as materials. Delay...

A novel technique for achieving variable phase shift in surface-acoustic-wave devices is demonstrated. By depositing a thin film of magnetostrictive material onto the surface conventional delay line, wave velocity can be varied by adjusting an externally applied magnetic field. Experimental results are presented nickel on lithium-niobate substrate, and several possible applications mentioned.

The degenerate surface acoustic wave elastic convolver is analyzed by solving the nonlinear piezoelectric equations of motion subject to appropriate boundary conditions. are treated a perturbation theory assuming that stress and electric displacement small compared respective linear quantities. We obtain expressions for open-circuit voltage (V0) short-circuit current (I0) in terms power (P(i)) incident waves constants material. also calculate figure merit M=Vrms0(P(1)P(2)/W2)−1/2 (W width...

An optical image is converted into an electrical signal by utilizing acoustic surface wave convolution in a monolithic structure composed of piezoelectric zinc oxide film on silicon substrate. Measurements are presented describing the variation efficiency with light intensity, input power, and convolver gate electrode dc bias. initialization procedure described that allows device to operate either memory mode or nonstorage which permits scanning nonstationary images.

It is known that when two acoustic surface-wave beams intersect in a suitably anisotropic medium, sum and difference frequency are generated parametrically if both phase velocity matched. Using coupled-mode theory we show this effect can occur even the presence of imperfect matching. In consequence it should be possible to produce and/or over continuous range angles, with direction controlled by ratio input beam frequencies. Computed output angles presented for number materials device...

A monolithic zinc−oxide−on−silicon surface wave convolver has been used to image optical patterns and store them for long periods of time. light pattern is stored by projecting it onto a semitransparent top electrode which an applied negative dc bias. Slow states associated with the zinc oxide are charged in regions exposed light. This charge pattern, as observed using convolution, persists even when removed. Retention several days demonstrated this device.

The U.S. Department of Energy sponsors the Advanced Test Reactor (ATR) National Scientific User Facility (NSUF) program to promote research in nuclear science and technology. By attracting new users - universities, laboratories, industry ATR NSUF facilitates basic applied development, advancing energy security needs. A key component effort is design, develop, deploy in-pile instrumentation techniques that are capable providing real-time measurements parameters during irradiation. This paper...

By utilizing an in-pile measurement, thermal conductivity can be determined under prototypic conditions over a range of burnup. In this work we develop multilayer quadrupoles analytical model to describe the transient interactions between line heat source (i.e. needle probe) and cylindrical nuclear fuel geometry for measurements. A finite element analysis detailed probe was compared results from verify assumptions made in model. Experimentally, used measure properties polytetrafluoroethylene...

Offspring size is a trait of fundamental importance that affects the ecology and evolution range organisms. Despite pervasive impact offspring for those offspring, influence on other species in broader community remains unexplored. Such community-wide effects are likely, but they have not been anticipated by theory or explored empirically. For marine invertebrate community, we manipulated density resident (Watersipora subtorquata) field examined subsequent assembly around species....

Many of the sensors deployed at materials and test reactors cannot withstand high flux/high temperature conditions often requested by users U.S. reactors, such as Advanced Test Reactor (ATR) Idaho National Laboratory. To address this issue, an instrumentation development effort was initiated part ATR Scientific User Facility in 2007 to support deployment enhanced in-pile sensors. This paper reports results from effort. Specifically, identifies types currently available irradiations those...

The transmission, reflection, and absorption characteristics for fluxons propagating in long Josephson junction transmission lines which are connected by resistive networks have been studied means of computer simulation. Although fluxon scattering behavior is qualitatively similar to that expected electromagnetic waves, the existence threshold resistances depend upon applied bias current loss observed. For case two junctions coupled a serious resistor, it found variations current, loss,...

As part of the Advanced Test Reactor National Scientific User Facility (ATR-NSUF) program, Idaho Laboratory (INL) has developed in-house capabilities to fabricate, test, and qualify new enhanced temperature sensors for irradiation testing. Clearly, sensor selection tests will be determined based on environment budget. However, now offered by INL include a wide array melt wires in small capsules, silicon carbide monitors, commercially available thermocouples, specialized high resistant...

Many of the sensors deployed at materials and test reactors cannot withstand high flux/high temperature conditions often requested by users U.S. reactors, such as Advanced Test Reactor (ATR) Idaho National Laboratory. To address this issue, an instrumentation development effort was initiated part ATR Scientific User Facility in 2007 to support deployment enhanced in-pile sensors. This paper provides update on effort. Specifically, identifies types currently available irradiations those...

New materials are being considered for fuel, cladding, and structures in next-generation existing nuclear reactors. Such can undergo significant dimensional physical changes during high-temperature irradiation. To accurately predict these changes, real-time data must be obtained under prototypic irradiation conditions model development validation. provide data, programs such as the Advanced Test Reactor (ATR) National Scientific Users Facility (NSUF) have funded researchers at Idaho...

The MZOS (metal-zinc oxide-silicon dioxide-silicon) structure is investigated in order to provide a phenomenological understanding of the charge transfer and trapping properties zinc oxide layer. Results fast-ramp measurements capacitance versus voltage are presented, on basis these results, some biasing operating procedures suggested make effective use memory capabilities this configuration or avoid unwanted effects. A technique for optical imaging described which offers several advantages...

It was found that at low currents and fields the steady-state forward postswitching curve of a silicon diode temperatures (below 15K) could be represented approximately by logI approximately=A+CV-B2( alpha sin2 theta + beta sin4 ) where I is current, V voltage, angle between direction current flow magnetic field B, A, C, are constants. A simple filament model with enhanced surface recombination used to explain results.

Diamond is an excellent material for a high-temperature thermistor given its superior properties. Despite long history of the development, diamond not widely used commercial sensors because it difficult to maintain optimum conditions operate at high temperature ranges in compact size. In this paper, we demonstrate methods improve practicality and feasibility thermistor, focusing on supporting components. The design, where sandwiched between contact pads, tested up 700 °C being characterized...

Dispersion characterisitcs of magnetoelastic surface waves in highly magnetostrictive cubic crystals are calculated for different bias fields applied along the direction propagation. Effects anisotropy taken into account. The found to be leaky or nonleaky depending on Velocity is both before and after saturation magnetic moment. Although most velocity change with field occurs while magnetization vector rotates from easy direction, changes by a few percent even moment saturates. Theoretical...

The purpose of this paper is to discuss applications charge-coupled devices in signal processing systems. Both analog and digital CCD concepts are considered. Recent developments high-speed (~100 MHz) CCD's discussed, the uses surface-acoustic wave (SAW) together Examples electro-optical systems, secure voice communication sonar systems radar given. Finally, projections for future presented.

We report the generation of difference-frequency acoustic surface waves by nonlinear interaction intersecting noncollinear surface-wave beams on [111]-cut bismuth germanium oxide, a material suitable anisotropy. The wave vector mixed-frequency beam can be steered over range angles varying frequency ratio input beams. Agreement with coupled-mode theory is found. It pointed out that effect makes number new devices possible.