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1

Saw Palmetto  

MedlinePLUS

... Palmetto Common Names: saw palmetto, American dwarf palm tree, cabbage palm Latin Name: Serenoa repens, Sabal serrulata ... more information. Saw palmetto is a small palm tree native to the eastern United States. Its fruit ...

2

29 CFR 570.65 - Occupations involving the operation of circular saws, band saws, guillotine shears, chain saws...  

...saws, guillotine shears, chain saws, reciprocating...abrasive cutting discs (Order 14). ...saws, guillotine shears, chain saws, reciprocating...abrasive cutting discs (Order 14). ...saws, guillotine shears, chain saws, reciprocating...abrasive cutting discs. (b)...

2014-07-01

3

Electric arc saw apparatus  

DOEpatents

A portable, hand held electric arc saw has a small frame for supporting an electrically conducting rotary blade which serves as an electrode for generating an electric arc to erode a workpiece. Electric current is supplied to the blade by biased brushes and a slip ring which are mounted in the frame. A pair of freely movable endless belts in the form of crawler treads stretched between two pulleys are used to facilitate movement of the electric arc saw. The pulleys are formed of dielectric material to electrically insulate the crawler treads from the frame.

Deichelbohrer, Paul R [Richland, WA

1986-01-01

4

Safe Chain Saw Operation.  

E-print Network

AND FELLING WEDGES I EXTI~bRJiSHER ~ ~ CHAIN FILING ~ ~ TOOLS FUEL CAN AND FUNNEL SHARP AX Figure 3. Use proper equipment to help you do the job safely. 2 /. SLEDGE HAMMER SHOVEL Special cautions: Electrically-powered chain saws re quire special...: ? Owner's manual in plastic bag ? Gasoline-oil fuel mixture stored in approved con tainer ? Chain oil ? Round file and guide for dressing (sharpening) chain ? Flat file and depth gauge to file the depth guides ? Wrenches to fit all nuts and lugs...

Nelson, Gary S.

1982-01-01

5

Lunar stone saw  

NASA Technical Reports Server (NTRS)

This project addresses the problem of cutting lunar stones into blocks to be used to construct shelters to protect personnel and equipment from harmful solar radiation. This plant will manufacture 6 in x 1 ft x 2 ft blocks and will be located near the south pole to allow it to be in the shade at all times. This design uses a computer controlled robot, a boulder handler that uses hydraulics for movement, a computer system that used 3-D vision to determine the size of boulders, a polycrystalline diamond tipped saw blade that utilizes radiation for cooling, and a solar tower to collect solar energy. Only two electric motors are used in this plant because of the heavy weight of electric motors and the problem of cooling them. These two motors will be cooled by thermoelectric cooling. All other motors and actuators are to be hydraulic. The architectural design for the building as well as the conceptual design of the machines for cutting the blocks are described.

Clark, Tom; Croker, Todd; Hines, Ken; Knight, Mike; Walton, Todd

1988-01-01

6

The sawing machine is a machine SAWING MACHINES  

E-print Network

main parts, which are discussed below. The head is the large unit at the top of the contour machine), and the adjustable post which supports the upper saw guide. The job selector dial is also located on the head the speed in feet per minute (FPM). The butt welder is also mounted on the column. different positions

Gellman, Andrew J.

7

Two Problems with Table Saws  

ERIC Educational Resources Information Center

We solve two problems that arise when constructing picture frames using only a table saw. First, to cut a cove running the length of a board (given the width of the cove and the angle the cove makes with the face of the board) we calculate the height of the blade and the angle the board should be turned as it is passed over the blade. Second, to…

Vautaw, William R.

2008-01-01

8

Wireless wideband SAW sensor - antenna design  

Microsoft Academic Search

Wireless SAW RFID sensors offer several advantages over similar silicon technology that include passive operation, radiation hardness, and the ability to operate in extreme temperatures. Due to these unique material and device properties, NASA has shown considerable interest in passive, wireless SAW sensors for ground and space flight operations. Several embodiments of SAW sensors have been well established in literature,

M. W. Gallagher; B. C. Santos; D. C. Malocha

2010-01-01

9

Wireless Passive SAW Identification Marks and Sensors  

Microsoft Academic Search

Surface acoustic wave (SAW) devices can be turned into identification and sensor elements, so called SAW transponders. Identification\\u000a elements transmit an individual ID number and sensor elements measure physical quantities such as temperature, pressure, torque,\\u000a acceleration, humidity, etc. The SAW devices do not require any power supply and may be accessed wirelessly.\\u000a \\u000a The complete sensor system consists of such a

Elke Mackensen; Leonhard Reindl

10

Chemically sensitive interfaces on SAW devices  

SciTech Connect

Using surface acoustic wave (SAW) devices, three approaches to the effective use of chemically sensitive interfaces that are not highly chemically selective have been examined: (1) molecular identification from time-resolved permeation transients; (2) using multifrequency SAW devices to determine the frequency dependence of analyte/film interactions; (3) use of an array of SAW devices bearing diverse chemically sensitive interfaces to produce a distinct response pattern for each analyte. In addition to their well-known sensitivity to mass changes (0.0035 monolayer of N{sub 2} can be measured), SAW devices respond to the mechanical and electronic properties of thin films, enhancing response information content but making a thorough understanding of the perturbation critical. Simultaneous measurement of changes in frequency and attenuation, which can provide the information necessary to determine the type of perturbation, are used as part of the above discrimination schemes.

Ricco, A.J.; Martin, S.J. [Sandia National Labs., Albuquerque, NM (United States); Crooks, R.M.; Xu, Chuanjing [Texas A and M Univ., College Station, TX (United States); Allred, R.E. [Adherent Technologies, Inc., Albuquerque, NM (United States)

1993-11-01

11

Research equipment: Surface Acoustic Wave (SAW) devices  

E-print Network

Research equipment: Surface Acoustic Wave (SAW) devices: Operating frequencies @50MHz, 104MHz, 110://www.home.agilent.com/agilent/home.jspx Quartz Crystal Microbalance with Dissipation monitoring (QCM-D): Qsense D-300 for real-time acoustic

Gizeli, Electra

12

Research equipment: Surface Acoustic Wave (SAW) devices  

E-print Network

Research equipment: Surface Acoustic Wave (SAW) devices: Operating frequencies @50MHz, 104MHz, 110 with Dissipation monitoring (QCM-D): Qsense D-300 for real-time acoustic measurements at low frequencies (5-35MHz

Gizeli, Electra

13

SAW Sensor for Fastener Failure Detection  

NASA Technical Reports Server (NTRS)

The proof of concept for using surface acoustic wave (SAW) strain sensors in the detection of aircraft fastener failures is demonstrated. SAW sensors were investigated because they have the potential for the development of passive wireless systems. The SAW devices employed four orthogonal frequency coding (OFC) spread spectrum reflectors in two banks on a high temperature piezoelectric substrate. Three SAW devices were attached to a cantilever panel with removable side stiffeners. Damage in the form of fastener failure was simulated by removal of bolts from the side stiffeners. During testing, three different force conditions were used to simulate static aircraft structural response under loads. The design of the sensor, the panel arrangement and the panel testing results are reported. The results show that the sensors successfully detected single fastener failure at distances up to 54.6 cm from the failure site under loaded conditions.

Wilson, W. C.; Rogge, M. D.; Fisher, B.; Roller, M. J.; Malocha, D. M.

2010-01-01

14

ARE NORTHERN SAW-WHET OWLS NOMADIC?  

Microsoft Academic Search

The first known nesting of a Northern Saw-whet Owl (Aegolius acadicus) in the Snake River Birds of Prey National Conservation Area occurred in a nest box in 1986, 4 yr after nest boxes were constructed in the study area. Occupancy of nest boxes by Northern Saw-whet Owls varied substantially over the next 13 yr (0-8 nests per yr). The number

JEFFREY S. MARKS; JOHN H. DOREMUS

15

Passive Wireless SAW Sensors for IVHM  

NASA Technical Reports Server (NTRS)

NASA aeronautical programs require integrated vehicle health monitoring (IVHM) to ensure the safety of the crew and the vehicles. Future IVHM sensors need to be small, light weight, inexpensive, and wireless. Surface acoustic wave (SAW) technology meets all of these constraints. In addition it operates in harsh environments and over wide temperature ranges, and it is inherently radiation hardened. This paper presents a survey of research opportunities for universities and industry to develop new sensors that address anticipated IVHM needs for aerospace vehicles. Potential applications of passive wireless SAW sensors from ground testing to high altitude aircraft operations are presented, along with some of the challenges and issues of the technology.

Wilson, William C.; Perey, Daniel F.; Atkinson, Gary M.; Barclay, Rebecca O.

2008-01-01

16

High Temperature Langasite SAW Oxygen Sensor  

SciTech Connect

High-temperature langasite SAW oxygen sensors using sputtered ZnO as a resistive gas-sensing layer were fabricated and tested. Sensitivity to oxygen gas was observed between 500°C to 700°C, with a sensitivity peak at about 625°C, consistent with the theoretical predictions of the acoustoelectric effect.

Zheng, Peng; Chin, Tao-Lun; Greve, David; Oppenheim, Irving; Malone, Vanessa; Cao, Limin

2011-08-01

17

See-saw geometry and leptogenesis  

Microsoft Academic Search

The representation of the see-saw orthogonal matrix in the complex plane establishes a graphical correspondence between neutrino mass models and geometrical configurations, particularly useful to study relevant aspects of leptogenesis. We first derive the CP asymmetry bound for hierarchical heavy neutrinos and then an expression for the effective leptogenesis phase, determining the conditions for maximal phase and placing a lower

P. di Bari

2005-01-01

18

Surface Acoustic Wave (SAW) Vibration Sensors  

PubMed Central

In the paper a feasibility study on the use of surface acoustic wave (SAW) vibration sensors for electronic warning systems is presented. The system is assembled from concatenated SAW vibration sensors based on a SAW delay line manufactured on a surface of a piezoelectric plate. Vibrations of the plate are transformed into electric signals that allow identification of the sensor and localization of a threat. The theoretical study of sensor vibrations leads us to the simple isotropic model with one degree of freedom. This model allowed an explicit description of the sensor plate movement and identification of the vibrating sensor. Analysis of frequency response of the ST-cut quartz sensor plate and a damping speed of its impulse response has been conducted. The analysis above was the basis to determine the ranges of parameters for vibrating plates to be useful in electronic warning systems. Generally, operation of electronic warning systems with SAW vibration sensors is based on the analysis of signal phase changes at the working frequency of delay line after being transmitted via two circuits of concatenated four-terminal networks. Frequencies of phase changes are equal to resonance frequencies of vibrating plates of sensors. The amplitude of these phase changes is proportional to the amplitude of vibrations of a sensor plate. Both pieces of information may be sent and recorded jointly by a simple electrical unit. PMID:22247694

Filipiak, Jerzy; Solarz, Lech; Steczko, Grzegorz

2011-01-01

19

Magnetoacoustic SAW interaction in YIG films  

Microsoft Academic Search

The magnetoacoustic SAW interaction has been experimentally investigated for yttrium-iron garnet films placed on gallium gadolinium garnet substrates. In this paper, we propose a new approach to the analysis of hysteresis dependencies which consist of two branches for different directions of magnetic field variation. For each of the branches, even and odd portions were separated. The even portions were shown

Boris D. Zaitsev; Alexey V. Ermolenko; Vladimir A. Fedorenko

1998-01-01

20

Enhanced Magnetostrictively Transduced SAW Devices - Measurements & Applications  

NASA Astrophysics Data System (ADS)

Surface acoustic wave (SAW) transducers can be made with magnetic materials using magnetostriction as a means of electromechanical coupling. Unlike conventional piezoelectrically transduced SAW devices, the magnetically transduced SAWs do not require an exotic single-crystal substrate or high temperature processing, and therefore may be easily integrated into Si-based integrated circuits. These devices have many potential applications, biosensors being one of the most promising. When the substrate between a transmitter and a detector transducer is functionalized with specific bio-receptors, a binding event will affect propagation of the SAW wave that can be detected with simple electronics. In previous MTSAW devices, the magnetomechanical coupling was found to be poor, resulting in insufficient signal amplitude. To obtain better performance, we are studying the use of alternative magnetostrictive materials including an amorphous CoFeTaZr alloy, CoNbZr, and compositions in the Terfernol family (TbFe2, etc.). We are using combinatorial materials science (continuous composition spread approach) to identify optimum alloy compositions. The devices are also being redesigned to yield better performance.

Woo, Noble C.

2005-03-01

21

Notes on SAW Tag Interrogation Techniques.  

National Technical Information Service (NTIS)

We consider the problem of interrogating a single SAW RFID tag with a known ID and known range in the presence of multiple interfering tags under the following assumptions: (1) The RF propagation environment is well approximated as a simple delay channel ...

R. J. Barton

2010-01-01

22

Z-path SAW RFID tag.  

PubMed

Surface acoustic wave (SAW) radio-frequency identification (RFID) tags are soon expected to be produced in very high volumes. The size and cost of a SAW RFID tag will be key parameters for many applications. Therefore, it is of primary importance to reduce the chip size. In this work, we describe the design principles of a 2.4-GHz SAW RFID tag that is significantly smaller than earlier reported tags. We also present simulated and experimental results. The coded signal should arrive at the reader with a certain delay (typically about 1 micros), i.e., after the reception of environmental echoes. If the tag uses a bidirectional interdigital transducer (IDT), space for the initial delay is needed on both sides of the IDT. In this work, we replace the bidirectional IDT by a unidirectional one. This halves the space required by the initial delay because all the code reflectors must now be placed on the same side of the IDT. We reduce tag size even further by using a Z-path geometry in which the same space in x-direction is used for both the initial delay and the code reflectors. Chip length is thus determined only by the space required by the code reflectors. PMID:18334326

Härmä, Sanna; Plessky, Victor P; Hartmann, Clinton S; Steichen, William

2008-01-01

23

Measurements of Vibration and Acceleration Utilizing SAW Sensors  

Microsoft Academic Search

In recent years, SAW devices became important for sensor purposes. SAW sensors are applied as well as wired sensor elements in active circuits and as remote passive devices. For wireless measurements, three types are available today, shown in the paper. An estimation of the measurement's dynamic and bandwidth is given. Utilizing SAW delay lines and resonators, the measurement of vibration

Alfred Pohl; Reinhard Steindl; Leonhard Reindl

24

Theory and application of passive SAW radio transponders as sensors  

Microsoft Academic Search

Surface acoustic wave (SAW) radio transponders make it possible to read identification codes or measurement values from a remote location. The decisive advantage of these SAW transponders lies in their passive operation (i.e., no power-supply), and in the possibility of wireless installation at particularly inaccessible locations. The passive SAW transponders are maintenance free. Identification marks respond to an interrogation signal

Leonhard Reindl; Gerd Scholl; Thomas Ostertag; Holger Scherr; U. Wolff; Frank Schmidt

1998-01-01

25

Wirelessly interrogable SAW-sensors for vehicular applications  

Microsoft Academic Search

Wirelessly interrogated passive SAW sensors for measurements in a rough environment are shown. These can be applied when remote readout is necessary and other sensors cannot withstand heat, dirt, mechanical vibration and\\/or electromagnetic interference. We show applications of passive SAW sensors for sensing tasks, especially in vehicles. The implementation of SAW sensors for measurements of torque and speed of revolution

A. Pohl; F. Seifert

1996-01-01

26

29 CFR 570.65 - Occupations involved in the operations of circular saws, band saws, and guillotine shears (Order...  

Code of Federal Regulations, 2010 CFR

...reciprocating saws, wood chippers, and abrasive cutting discs (Order 14). (a... (iii) Wood chippers. (iv) Abrasive cutting discs. (3) The occupations...reciprocating saws, wood chippers, and abrasive cutting discs. (b)...

2010-07-01

27

Controlling dust from concrete saw cutting.  

PubMed

Cutting concrete with gas-powered saws is ubiquitous in the construction industry and a source of exposure to respirable crystalline silica. Volunteers from the New England Laborers Training Center were recruited to participate in a field experiment examining dust reductions through the use of water, from a hose and from a sprayer, as a dust control. In four series of tests, reinforced concrete pipe was cut under both "dry" and "wet" control conditions. Overall, the geometric mean respirable dust concentration for "dry" cutting (14.396 mg/m³) exceeded both types of water-based controls by more than tenfold. Wet cutting reduced the respirable dust concentration by 85% compared with dry cutting when comparing tests paired by person and saw blade (n = 79 pairs). Using a respirable cyclone, a total of 178 samples were taken. Due to the high variability in dust exposure found in this and other studies of saw cutting, the data were examined for potential exposure determinants that contribute to that variability. Using mixed models, three fixed effects were statistically significant: control condition, worker experience, and location. A random effect for subject was included in the model to account for repeated measures. When each of the significant fixed effects was included with the random effect, it was apparent that inclusion of worker experience or location reduced the between-worker component of exposure variability, while inclusion of control condition (wet vs. dry) explained a large portion of the within-subject variability. Overall, the fixed effect variable for control condition explained the largest fraction of the total exposure variability. PMID:23252479

Shepherd, Susan; Woskie, Susan

2013-01-01

28

Magnetoacoustic SAW interaction in YIG films.  

PubMed

The magnetoacoustic SAW interaction has been experimentally investigated for yttrium-iron garnet films placed on gallium gadolinium garnet substrates. In this paper, we propose a new approach to the analysis of hysteresis dependencies which consist of two branches for different directions of magnetic field variation. For each of the branches, even and odd portions were separated. The even portions were shown to be related to magnetostriction and the odd ones to DeltaE-effect and magnetostriction linearized internal magnetic field of domains. PMID:18244187

Zaitsev, B D; Ermolenko, A V; Fedorenko, V A

1998-01-01

29

Thermal Imaging of Medical Saw Blades and Guides  

SciTech Connect

Better Than New, LLC., has developed a surface treatment to reduce the friction and wear of orthopedic saw blades and guides. The medical saw blades were thermally imaged while sawing through fresh animal bone and an IR camera was used to measure the blade temperature as it exited the bone. The thermal performance of as-manufactured saw blades was compared to surface-treated blades, and a freshly used blade was used for temperature calibration purposes in order to account for any emissivity changes due to organic transfer layers. Thermal imaging indicates that the treated saw blades cut faster and cooler than untreated blades. In orthopedic surgery, saw guides are used to perfectly size the bone to accept a prosthesis. However, binding can occur between the blade and guide because of misalignment. This condition increases the saw blade temperature and may result in tissue damage. Both treated ad untreated saw guides were also studied. The treated saw guide operated at a significantly lower temperature than untreated guide. Saw blades and guides that operate at a cooler temperature are expected to reduce the amount of tissue damage (thermal necrosis) and may reduce the number of post-operative complications.

Dinwiddie, Ralph Barton [ORNL; Steffner, Thomas E [ORNL

2007-01-01

30

A monolithic SAW-charge transfer device  

NASA Technical Reports Server (NTRS)

Surface acoustic waves excited in a Si-SiO2-ZnO layered structure can produce a traveling electric field in the silicon substrate. Charges stored in the traveling potential wells can be transferred at high speed and density and with less complexity. The monolithic structure under investigation for the SAW-charge transfer device consists of a silicon substrate, a thin silicon dioxide insulating layer on top of which a ZnO piezoelectric film is deposited by sputtering. The surface acoustic waves are excited by interdigital transducers. The signal charge is injected into traveling potential wells that travel with the velocity of sound. Conditions for the transfer of the charges by the traveling wells are analyzed. A surface acoustic wave program was used to determine the optimum structure dimensions and transducer configuration which will produce the highest coupling in the excitation of the piezoelectric waves.

Papanicolaou, N. A.; Lin, H. C.

1978-01-01

31

Current developments in SAW oscillator stability  

NASA Technical Reports Server (NTRS)

The results reported were obtained with two port delay lines and resonators used in a simple feedback oscillator. The feedback oscillator employed inherently operates with the amplifier in a saturated condition and, therefore, the AM noise is suppressed. Consequently the dominant noise is FM. Generally, it can be concluded that for very narrow-band, or fixed-frequency applications, the resonator-type oscillator will give the best noise performance. For applications where tunability and linearity are important, the delay-line-type oscillator may give the best performance. There have been no significant improvements in oscillator temperature stability. The only two demonstrated materials for temperature stable SAW oscillators are ST-cut quartz and the SiO2/LiTaO3 overlay structure. Aging tests have been going on for the past two-and-a-half years and it has become obvious that the observed aging rates are largely related to cleaning and packaging.

Parker, T. E.

1977-01-01

32

[The morphological features of skin wounds inflicted by joinery hand saws designed for different types of sawing].  

PubMed

The objective of the present work was to study the morphological features of skin wounds inflicted by joinery hand saws designed for longitudinal, transverse, and mixed sawing. A total of 60 injuries to the thigh skin inflicted by the recurring and reciprocating saw movements were simulated. The hand saws had 5 mm high "sharp" and "blunt"-tipped teeth. The analysis of the morphological features of the wounds revealed differences in their length and depth, shape of edge cuts and defects, and the relief of the walls depending on the sawtooth sharpness and the mode of sawing. It is concluded that morphological features of the wounds may be used to determine the type of the saw, the sharpness of its teeth, the direction and frequency of its movements. PMID:25269171

Sarkisian, B A; Azarov, P A

2014-01-01

33

Monitoring the tire pressure at cars using passive SAW sensors  

Microsoft Academic Search

In our paper we present the application of surface acoustic wave (SAW) sensors to the continuous monitoring of the tire pressure in road vehicles. With these, the tire pressure can be read out in every phase of driving. We show the implemented prototype setup for measurement of the tire pressure, the applied SAW sensors, improved versions and the interrogation setup.

Alfred Pohl; G. Ostermayer; L. Reindl; F. Seifert

1997-01-01

34

A Study of Magnetic Sawing in an Aluminum Bar  

Microsoft Academic Search

Magnetic sawing is a phenomenon that can severely damage electrical conductors. In this process, high local current densities melt the conductor and eject the liquid metal through magnetic forces. This is exacerbated at the interface between dissimilar metals. To further characterize magnetic sawing, we used a new technique with alternating strips of copper conductors and G-10 insulators placed onto an

David Melton; Trevor Watt; Mark Crawford

2007-01-01

35

Extended suicide by use of a chain saw.  

PubMed

Injuries caused by chain saws are mostly seen due to accidents. Suicides by chain saws are rare, but some cases have already been described. We present the case of homicide on a child by a chain saw followed by the suicide of his father. For the homicide and the suicide chain saws of different sizes were used. Fatal injuries in the homicide and suicide were located on the neck. Cause of death in both cases was fatal haemorrhage with blood aspiration respectively decapitation. Normally, in suicide by use of chain saws individuals suffering from schizophrenia, major depression and alcohol or drug dependence are concerned. In the presented case, the background was a litigation of a divorced couple for child custody. PMID:23540836

Schyma, Christian; Albalooshi, Younis; Madea, Burkhard

2013-05-10

36

New developments for SAW channelization for mobile satellite payloads  

NASA Technical Reports Server (NTRS)

The use of SAW technology in mobile communication payloads is becoming widely accepted by the industry since being pioneered by Inmarsat for its third generation of satellites. This paper presents new developments in this area, including broadband processors of the Inmarsat 3 type, and the use of SAW filters at L-band. It is demonstrated that SAW processors have considerable potential for increasing the capacity of future communications payloads, while allowing fully transparent operation without any restriction on traffic type or modulation format. In addition to the evolutionary development of Inmarsat type processors, new SAW applications have also emerged recently. Therefore, despite the rapid changes in the industry, it is predicted that SAW processing has a strong future in satellite communications.

Peach, R. C.; Mabson, P.

1995-01-01

37

ISS Asset Tracking Using SAW RFID Technology  

NASA Technical Reports Server (NTRS)

A team at the NASA Johnson Space Center (JSC) is undergoing final preparations to test Surface Acoustic Wave (SAW) Radio Frequency Identification (RFID) technology to track assets aboard the International Space Station (ISS). Currently, almost 10,000 U.S. items onboard the ISS are tracked within a database maintained by both the JSC ground teams and crew onboard the ISS. This barcode-based inventory management system has successfully tracked the location of 97% of the items onboard, but its accuracy is dependant on the crew to report hardware movements, taking valuable time away from science and other activities. With the addition of future modules, the volume of inventory to be tracked is expected to increase significantly. The first test of RFID technology on ISS, which will be conducted by the Expedition 16 crew later this year, will evaluate the ability of RFID technology to track consumable items. These consumables, which include office supplies and clothing, are regularly supplied to ISS and can be tagged on the ground. Automation will eliminate line-of-sight auditing requirements, directly saving crew time. This first step in automating an inventory tracking system will pave the way for future uses of RFID for inventory tracking in space. Not only are there immediate benefits for ISS applications, it is a crucial step to ensure efficient logistics support for future vehicles and exploration missions where resupplies are not readily available. Following a successful initial test, the team plans to execute additional tests for new technology, expanded operations concepts, and increased automation.

Schellhase, Amy; Powers, Annie

2004-01-01

38

12. Interior view showing main section, mezzanine and saw tooth ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. Interior view showing main section, mezzanine and saw tooth truss roof with skylight, looking west. - College Heights Lemon Packing House, 519-532 West First Street, Claremont, Los Angeles County, CA

39

SAW 2012 Class and Counselors Multicultural Student Affairs  

E-print Network

network for students to create life-long friendships. Since 1966, SAW has welcomed over 1400 students;1. The Application (an Adobe form) 2. Unofficial transcripts 3. Cover letter (letter describing your interest) 4

40

DNA Barcode Authentication of Saw Palmetto Herbal Dietary Supplements  

PubMed Central

Herbal dietary supplements made from saw palmetto (Serenoa repens; Arecaceae) fruit are commonly consumed to ameliorate benign prostate hyperplasia. A novel DNA mini–barcode assay to accurately identify [specificity = 1.00 (95% confidence interval = 0.74–1.00); sensitivity = 1.00 (95% confidence interval = 0.66–1.00); n = 31] saw palmetto dietary supplements was designed from a DNA barcode reference library created for this purpose. The mini–barcodes were used to estimate the frequency of mislabeled saw palmetto herbal dietary supplements on the market in the United States of America. Of the 37 supplements examined, amplifiable DNA could be extracted from 34 (92%). Mini–barcode analysis of these supplements demonstrated that 29 (85%) contain saw palmetto and that 2 (6%) supplements contain related species that cannot be legally sold as herbal dietary supplements in the United States of America. The identity of 3 (9%) supplements could not be conclusively determined. PMID:24343362

Little, Damon P.; Jeanson, Marc L.

2013-01-01

41

Effect of critical dimension variation on SAW correlator energy.  

SciTech Connect

The effect of critical dimension (CD) variation and metallization ratio on the efficiency of energy conversion of a surface acoustic wave (SAW) correlator is examined. We find that a 10% variation in the width of finger electrodes predicts only a 1% decrease in the efficiency of energy conversion. Furthermore, our model predicts that a metallization ratio of 0.74 represents an optimum value for energy extraction from the SAW by the interdigitated transducer (IDT).

Skinner, Jack L.

2005-04-01

42

Effect of critical dimension variation on SAW correlator energy.  

PubMed

The effect of critical dimension (CD) variation and metallization ratio on the efficiency of energy conversion of a surface acoustic wave (SAW) correlator is examined. We find that a 10% variation in the width of finger electrodes predicts only a 1% decrease in the efficiency of energy conversion. Furthermore, our model predicts that a metallization ratio of 0.74 represents an optimum value for energy extraction from the SAW by the interdigitated transducer (IDT). PMID:16529126

Skinner, J L; Cardinale, G F; Talin, A A; Brocato, R W

2006-02-01

43

Tip stabilizer for a chain saw. Final report  

SciTech Connect

Prior to receiving the grant, Utilitip was faced with an idea that truly worked, however only a very limited line of component parts would fit various types of chain saws on the market. It also suffered from a severe problem when engaged in the ground of soil penetrating the saw chain area, thus eliminating one of the major benefits of keeping the chain sharp. Consequently, the grant funding was directed towards extending the tooling capabilities to produce parts for a much wider variety of chain saws that are on the market, and further by developing an effective flexible soil shield to prevent abrasive soil entry into the saw chain. Utilitip was able to complete a full set of design for a wide variety of large and small chain saws. This incorporated a design and fabrication of a small Utilitip, as well as a small anti-kickback device. In addition, tooling was also further developed for the large Utilitip and the large anti-kickback device. Accordingly, multiple tools are available for all combinations, as well as back-up provisions. Utilitip, Inc. invented a special, flexible attachment to be glued and/or molded to the tip guard. The soil shield prevents abrasive soil from coming into the chain area. In addition, it allows a flexible arrangement to allow the chain saw to be released from brush without binding. Otherwise, a larger, rigid soil shield would hold or restrict the saw in heavy brush. The rubber shield will flex out of the say and reduce, if not eliminate, this harmful binding.

Morabit, V.D.

1993-09-10

44

Robust Design of SAW Gas Sensors by Taguchi Dynamic Method.  

PubMed

This paper adopts Taguchi's signal-to-noise ratio analysis to optimize the dynamic characteristics of a SAW gas sensor system whose output response is linearly related to the input signal. The goal of the present dynamic characteristics study is to increase the sensitivity of the measurement system while simultaneously reducing its variability. A time- and cost-efficient finite element analysis method is utilized to investigate the effects of the deposited mass upon the resonant frequency output of the SAW biosensor. The results show that the proposed methodology not only reduces the design cost but also promotes the performance of the sensors. PMID:22573961

Tsai, Hsun-Heng; Wu, Der Ho; Chiang, Ting-Lung; Chen, Hsin Hua

2009-01-01

45

SAW chemical sensor arrays using new thin-film materials  

SciTech Connect

We have used two classes of materials, self-assembled monolayers (SAMs) and plasma-grafted films (PGFs), as new chemically sensitive layers for an array of 97-MHz surface acoustic wave (SAW) delay-line-based devices. Responses of these materials to each of 14 different analytes, representing the classes of saturated alkane, aromatic hydrocarbon, chlorinated hydrocarbon, alcohol, ketone, organophosphonate, and water, have been evaluated using our six-SAW device array. Results reveal a qualitative ``chemical orthogonality`` of the films that is very promising for pattern recognition analysis.

Ricco, A.J. [Sandia National Labs., Albuquerque, NM (United States); Xu, Chuanjing; Crooks, R.M. [Texas A& M Univ., College Station, TX (United States). Dept. of Chemistry; Allred, R.E. [Adherent Technologies, Inc., Albuquerque, NM (United States)

1994-05-01

46

Monitoring blood coagulation with QCM and SH SAW sensors  

Microsoft Academic Search

Investigations concerning a coagulation sensor based on shear horizontal surface acoustic waves (SH-SAW) are described. As a first step, experimental work was focused on a simpler system: a quartz crystal micro balance (QCM) also called thickness shear mode resonator (TSM). In the literature the suitability of such devices for the characterization of coagulation process is already described. Coagulation tests like

Glen Guhr; Reinhard Kunze; Günter Martin; Hagen Schmidt; M. Weihnachr; Siegmund Gehrisch; Gabriele Siegert

2005-01-01

47

28. MODIFIED CHAIN SAW FOR CUTTING ROCK CORES; BRUNTON COMPASS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. MODIFIED CHAIN SAW FOR CUTTING ROCK CORES; BRUNTON COMPASS STAND FOR DETERMINING CORE'S FIELD ORIENTATION; INSECTICIDE DISPENSER MODIFIED TO LUBRICATE CORE DRILLING PROCESS. - U.S. Geological Survey, Rock Magnetics Laboratory, 345 Middlefield Road, Menlo Park, San Mateo County, CA

48

Suppression of the leaky SAW attenuation with heavy mechanical loading.  

PubMed

We discuss effects on the propagation of surface acoustic waves (SAW) due to heavy mass loading on Y-cut lithium niobate and lithium tantalate substrates. An abrupt reduction in the leaky-SAW (LSAW) attenuation is observed in the measured admittance of a long resonator test structure on 64 degrees -YX-cut lithium niobate for aluminum electrodes of thickness h/lambda(0) beyond 9-10%. This experimental fact is explained theoretically as the slowing down of the leaky wave below the velocity of the slow shear surface-skimming bulk wave (SSBW), such that energy dissipation into bulk-wave emission becomes inhibited. An infinite transducer structure is modeled using the periodic Green's function and the boundary-element method (BEM); the computed theoretical properties well explain for the experimental findings. The model is further employed to quantify the leaky surface-wave attenuation characteristics as functions of the crystal-cut angle and the thickness of the electrodes. The resonance and antiresonance frequencies and the corresponding Q values are investigated to facilitate the selection of crystal cuts and electrode thicknesses. The transformation of the leaky SAW into a SAW-type nonleaky wave is also predicted to occur for gold electrodes, with considerably thinner finger structures. PMID:18244195

Koskela, J; Plessky, V P; Salomaa, M M

1998-01-01

49

A conflict based SAW method for Constraint Satisfaction Problems  

Microsoft Academic Search

Evolutionary algorithms have employed the SAW (Stepwise Adaptation of Weights) method in order to solve CSPs (Constraint Satisfaction Problems). This method originated in hill-climbing algorithms used to solve instances of 3-SAT by adapting a weight for each clause. Originally, adaptation of weights for solving CSPs was done by assigning a weight for each variable or each constraint. Here we investigate

Rafi Shalom; Mireille Avigal; Ron Unger

2009-01-01

50

A Novel Wireless and Temperature-Compensated SAW Vibration Sensor.  

PubMed

A novel wireless and passive surface acoustic wave (SAW) based temperature-compensated vibration sensor utilizing a flexible Y-cut quartz cantilever beam with a relatively substantial proof mass and two one-port resonators is developed. One resonator acts as the sensing device adjacent to the clamped end for maximum strain sensitivity, and the other one is used as the reference located on clamped end for temperature compensation for vibration sensor through the differential approach. Vibration directed to the proof mass flex the cantilever, inducing relative changes in the acoustic propagation characteristics of the SAW travelling along the sensing device, and generated output signal varies in frequency as a function of vibration.  A theoretical mode using the Rayleigh method was established to determine the optimal dimensions of the cantilever beam. Coupling of Modes (COM) model was used to extract the optimal design parameters of the SAW devices prior to fabrication. The performance of the developed SAW sensor attached to an antenna towards applied vibration was evaluated wirelessly by using the precise vibration table, programmable incubator chamber, and reader unit.  High vibration sensitivity of ~10.4 kHz/g, good temperature stability, and excellent linearity were observed in the wireless measurements. PMID:25372617

Wang, Wen; Xue, Xufeng; Huang, Yangqing; Liu, Xinlu

2014-01-01

51

THE SUBSPECIES OF THE NORTHERN SAW-WHET  

Microsoft Academic Search

and determine the seasonal distribution of nominate acadicus on the Queen Charlotte Islands. Records of acadicus on the Queen Charlotte Islands have not been compiled, and the inter-island distribution of brooksi has not been ascertained. Godfrey (1986:328) stated that Northern Saw-whet Owls (presumably brooksi) occur in \\

SPENCER G. SEALY

1998-01-01

52

The Arabidopsis BEL1-LIKE HOMEODOMAIN Proteins SAW1 and SAW2 Act Redundantly to Regulate KNOX Expression Spatially in Leaf Margins[W  

PubMed Central

In Arabidopsis thaliana, the BEL1-like TALE homeodomain protein family consists of 13 members that form heterodimeric complexes with the Class 1 KNOX TALE homeodomain proteins, including SHOOTMERISTEMLESS (STM) and BREVIPEDICELLUS (BP). The BEL1-like protein BELLRINGER (BLR) functions together with STM and BP in the shoot apex to regulate meristem identity and function and to promote correct shoot architecture. We have characterized two additional BEL1-LIKE HOMEODOMAIN (BLH) proteins, SAWTOOTH1 (BLH2/SAW1) and SAWTOOTH2 (BLH4/SAW2) that, in contrast with BLR, are expressed in lateral organs and negatively regulate BP expression. saw1 and saw2 single mutants have no obvious phenotype, but the saw1 saw2 double mutant has increased leaf serrations and revolute margins, indicating that SAW1 and SAW2 act redundantly to limit leaf margin growth. Consistent with this hypothesis, overexpression of SAW1 suppresses overall growth of the plant shoot. BP is ectopically expressed in the leaf serrations of saw1 saw2 double mutants. Ectopic expression of Class 1 KNOX genes in leaves has been observed previously in loss-of-function mutants of ASYMMETRIC LEAVES (AS1). Overexpression of SAW1 in an as1 mutant suppresses the as1 leaf phenotype and reduces ectopic BP leaf expression. Taken together, our data suggest that BLH2/SAW1 and BLH4/SAW2 establish leaf shape by repressing growth in specific subdomains of the leaf at least in part by repressing expression of one or more of the KNOX genes. PMID:17873098

Kumar, Ravi; Kushalappa, Kumuda; Godt, Dietmute; Pidkowich, Mark S.; Pastorelli, Sandro; Hepworth, Shelley R.; Haughn, George W.

2007-01-01

53

The Arabidopsis BEL1-LIKE HOMEODOMAIN proteins SAW1 and SAW2 act redundantly to regulate KNOX expression spatially in leaf margins.  

PubMed

In Arabidopsis thaliana, the BEL1-like TALE homeodomain protein family consists of 13 members that form heterodimeric complexes with the Class 1 KNOX TALE homeodomain proteins, including SHOOTMERISTEMLESS (STM) and BREVIPEDICELLUS (BP). The BEL1-like protein BELLRINGER (BLR) functions together with STM and BP in the shoot apex to regulate meristem identity and function and to promote correct shoot architecture. We have characterized two additional BEL1-LIKE HOMEODOMAIN (BLH) proteins, SAWTOOTH1 (BLH2/SAW1) and SAWTOOTH2 (BLH4/SAW2) that, in contrast with BLR, are expressed in lateral organs and negatively regulate BP expression. saw1 and saw2 single mutants have no obvious phenotype, but the saw1 saw2 double mutant has increased leaf serrations and revolute margins, indicating that SAW1 and SAW2 act redundantly to limit leaf margin growth. Consistent with this hypothesis, overexpression of SAW1 suppresses overall growth of the plant shoot. BP is ectopically expressed in the leaf serrations of saw1 saw2 double mutants. Ectopic expression of Class 1 KNOX genes in leaves has been observed previously in loss-of-function mutants of ASYMMETRIC LEAVES (AS1). Overexpression of SAW1 in an as1 mutant suppresses the as1 leaf phenotype and reduces ectopic BP leaf expression. Taken together, our data suggest that BLH2/SAW1 and BLH4/SAW2 establish leaf shape by repressing growth in specific subdomains of the leaf at least in part by repressing expression of one or more of the KNOX genes. PMID:17873098

Kumar, Ravi; Kushalappa, Kumuda; Godt, Dietmute; Pidkowich, Mark S; Pastorelli, Sandro; Hepworth, Shelley R; Haughn, George W

2007-09-01

54

Invariant see-saw models and sequential dominance  

E-print Network

We propose an invariant see-saw (ISS) approach to model building, based on the observation that see-saw models of neutrino mass and mixing fall into basis invariant classes labelled by the Casas-Ibarra $R$-matrix, which we prove to be invariant not only under basis transformations but also non-unitary right-handed neutrino transformations $S$. According to the ISS approach, given any see-saw model in some particular basis one may determine the invariant $R$ matrix and hence the invariant class to which that model belongs. The formulation of see-saw models in terms of invariant classes puts them on a firmer theoretical footing, and allows different see-saw models in the same class to be related more easily, while their relation to the $R$-matrix makes them more easily identifiable in phenomenological studies. We also present an ISS mass formula which may be useful in model building. To illustrate the ISS approach we show that sequential dominance (SD) models form basis invariant classes in which the $R$-matrix is approximately related to a permutation of the unit matrix, and quite accurately so in the case of constrained sequential dominance (CSD) and tri-bimaximal mixing. Using the ISS approach we discuss examples of models in which the mixing naturally arises (at least in part) from the charged lepton or right-handed neutrino sectors and show that they are in the same invariant class as SD models. We also discuss the application of our results to flavour-dependent leptogenesis where we show that the case of a real $R$ matrix is approximately realized in SD, and accurately realized in CSD.

S. F. King

2006-10-18

55

77 FR 8751 - Table Saw Blade Contact Injuries; Reopening of the Comment Period  

Federal Register 2010, 2011, 2012, 2013

...CPSC-2011-0074] Table Saw Blade Contact Injuries; Reopening of the Comment Period...injury associated with table saw blade contact, regulatory alternatives, other possible...including any personal identifiers, contact information, or other personal...

2012-02-15

56

Passive hybrid sensing tag with flexible substrate saw device  

DOEpatents

The integration of surface acoustic wave (SAW) filters, microfabricated transmission lines, and sensors onto polymer substrates in order to enable a passive wireless sensor platform is described herein. Incident microwave pulses on an integrated antenna are converted to an acoustic wave via a SAW filter and transmitted to an impedance based sensor, which for this work is a photodiode. Changes in the sensor state induce a corresponding change in the impedance of the sensor resulting in a reflectance profile. Data collected at a calibrated receiver is used to infer the state of the sensor. Based on this principal, light levels were passively and wirelessly demonstrated to be sensed at distances of up to about 12 feet.

Skinner, Jack L.; Chu, Eric Y.; Ho, Harvey

2012-12-25

57

Pure SH-SAW propagation, transduction and measurements on KNbO3  

Microsoft Academic Search

Potassium niobate (KNbO3) supports the electromechanically active pure shear horizontal surface acoustic wave (SH-SAW) mode along Z-axis cylinder orientations, Euler angles: (?, 90°, 0°), in which two uncoupled wave solutions exist: a purely mechanical sagittal Rayleigh SAW and a piezoelectrically stiffened pure SH-SAW. Within this family of cuts, a maximum electromechanical coupling coefficient for the pure SH-SAW, K2 = 53%,

Thomas B. Pollard; T. D. Kenny; John F. Vetelino; Mauricio Pereira da Cunha

2006-01-01

58

BAW and SAW sensors for in-situ analysis  

NASA Technical Reports Server (NTRS)

In-situ analysis is a major goal in current and future NASA exploration missions. In general in-situ analysis experiments are designed to investigate chmical, biological or geological markers or properties to determine the complex history of the body being studied. In order to expand the number of applicable sensor schemes an investigation into piezoelectric bulk acoustic wave (BAW) and surface acoustic wave (SAW) resonators has been initiated.

Bar-Cohen, Y.; Bao, X. Q.; Chang, Z.; Sherrit, S.

2003-01-01

59

Characterization and Qualification of a Precision Diamond Saw  

SciTech Connect

A precision diamond saw was characterized and qualified for production using the MCCS Encryption Translator (MET) network. This characterization was performed in three steps. First the equipment was evaluated and characterized, and then a process was developed and characterized to saw cofire networks. Finally, the characterized process was qualified for production using the MET network. During the development of the low-temperature cofired ceramic (LTCC) processes needed to build the MCCS Encryption Translator (MET) network, a problem was uncovered. The laser process planned for scribing and separating was found to weaken the LTCC material by about 30%. A replacement process was needed, and precision diamond sawing was chosen. During the equipment evaluation and characterization, several parameters were investigated. These were cut depth, feed rate, spindle speed, and saw blade thickness. Once these were understood the process was then developed. Initially 24 variables were identified for the process, and eventually 12 of these variables were found to be critical. These variables were then adjusted until a process envelope was found that produced acceptable product. Finally parameters were chosen from the middle of the process envelope for production. With the production process set, the next step was to qualify it for production. Two criteria had to be met: visual acceptability and bending strength. The parts were examined under a microscope and found to be visually acceptable. Parts were then put through a four-point bend test, and the strengths recorded were equivalent to those measured in the past. With the completion of this work and the acceptable results, this process was qualified for production use.

Morgenstern, H.A.

1999-03-04

60

Corrosion inhibitors for water-base slurry in multiblade sawing  

Microsoft Academic Search

The use of a water-base slurry instead of the standard PC oil vehicle was proposed for multiblade sawing (MBS) silicon wafering technology. Potential cost savings were considerable; however, significant failures of high-carbon steel blades were observed in limited tests using a water-based slurry during silicon wafering. Failures were attributed to stress corrosion. A specially designed fatigue test of 1095 steel

C. P. Chen; T. P. Odonnell

1982-01-01

61

Nanotoxicity of Occupational Dust Generated in Granite Stone Saw Mill  

Microsoft Academic Search

The risk of occupational exposure to particles of granite exists during quarrying, saw milling and construction work environment. These particles are known to have predominantly micro-size as well as nanosize. Moreover, toxicological profiles of these particles are not known. An attempt was therefore made to study size-dependent cytotoxicity of granite particles using lung epithelial cell line A549. Occupational dust settled

Iqbal Ahmad; Mohd Imran Khan; Govil Patil

2011-01-01

62

Auditory Surveys for Northern Saw-whet Owls (Aegolius acadicus) in Southern Wisconsin 1986-1996  

E-print Network

Auditory Surveys for Northern Saw-whet Owls (Aegolius acadicus) in Southern Wisconsin 1986-1996 Ann-year variability in amount of calling by Northern Saw-whet Owls (Aegolius acadicus), as well as other factors February and 27 April during 1986-1996, our detection of calling by Northern Saw-whet Owls (Aegolius

63

Method for nondestructive testing of the film coating behavior of surface acoustic wave (SAW) sensors  

Microsoft Academic Search

This paper presents a practical non-destructive method for studying the film coating behavior of SAW devices by using a water soluble dielectric film (manitol) deposited on the SAW device surface by resistive evaporation. After measuring the electrical parameters of the film coated SAW device, the film can easily be removed from its surface by water rinsing without causing any damage

M. A. Taslakov; I. D. Avramov

2010-01-01

64

Langasite SAW temperature and oxygen multi-sensor P. Zheng,1,2  

E-print Network

Langasite SAW temperature and oxygen multi-sensor P. Zheng,1,2 D.W. Greve,1,3 I.J. Oppenheim,1 obtained for langasite SAW oxygen sensors. We particularly focus on the temperature dependence a langasite SAW device suitable for sensing temperature and oxygen concentration, with applications

Greve, David.W.

65

Saw IF Filter on LITaO3 for Color TV Receivers  

Microsoft Academic Search

More than eight years have passed since DeVries et al. reported the first attempt at installing SAW (Surface Acoustic Wave) filters in a TV set(1). In Japan, SAW IF filter development has been continued by several companies and TV receivers incorporating SAW filter have been placed on the market since 1977.

Sadao Takahashi; Hitoshi Hirano; Toshikazu Kodama; Fumio Miyashiro; Bunzo Suzuki; Akira Onoe; Tatsuya Adachi; Koichi Fujinuma

1978-01-01

66

On spurious bulk wave excitation in SAW grating reflectors on GaAs(001)(110)  

NASA Technical Reports Server (NTRS)

Reflection of SAW (surface acoustic waves) from groove gratings on a cubic crystal is analyzed numerically on the basis of perturbation theory. It is shown that for certain angles of incidence, the conversion of SAW into bulk waves vanishes. This reduces the SAW reflection loss from grating.

Danicki, E.; Hunt, W. D.

1995-01-01

67

Roughening and smoothing behavior of Al/Zr multilayers grown on flat and saw-tooth substrates  

E-print Network

the observed decay of the PSD of saw-tooth substrates duringthe decay of PSD peaks during deposition on a saw-toothdecay assuming both n=2 and n=4 process presenting during the smoothing of the saw-tooth

Voronov, Dmitriy

2012-01-01

68

1st Order Modeling of a SAW Delay Line using MathCAD(Registered)  

NASA Technical Reports Server (NTRS)

To aid in the development of SAW sensors for Integrated Vehicle Health Monitoring applications, a first order model of a SAW Delay line has been created using MathCadA. The model implements the Impulse Response method to calculate the frequency response, impedance, and insertion loss. This paper presents the model and the results from the model for a SAW delay line design. Integrated Vehicle Health Monitoring (IVHM) of aerospace vehicles requires rugged sensors having reduced volume, mass, and power that can be used to measure a variety of phenomena. Wireless systems are preferred when retro-fitting sensors onto existing vehicles [1]. Surface Acoustic Wave (SAW) devices are capable of sensing: temperature, pressure, strain, chemical species, mass loading, acceleration, and shear stress. SAW technology is low cost, rugged, lightweight, and extremely low power. Passive wireless sensors have been developed using SAW technology. For these reasons new SAW sensors are being investigated for aerospace applications.

Wilson, William C.; Atkinson, Gary M.

2007-01-01

69

Can LHC Test the See-Saw Mechanism?  

E-print Network

We discuss the prospects for detecting right-handed neutrinos which are introduced in the see-saw mechanism at future colliders. This requires a very accurate cancellation between contributions from different right-handed neutrinos to the light neutrino mass matrix. We search for possible symmetries behind this cancellation and find that they have to include lepton number conservation. Light neutrino masses can be generated as a result of small symmetry-breaking perturbations. The impact of these perturbations on LHC physics is negligible, so that the mechanism of neutrino mass generation and LHC physics are decoupled in general. In constrained cases, accelerator observables and neutrino masses and mixings can be correlated.

Joern Kersten

2007-10-12

70

Silicon sawing waste treatment by electrophoresis and gravitational settling.  

PubMed

In silicon wafer manufacturing for solar cells, a great amount of hazardous sawing waste with tiny Si particles is produced, resulting in serious environmental problems. Recycling Si and abrasives from the waste is regarded as an effective solution. Based on the view of recycling, Al(2)O(3) might be good abrasives for cutting Si ingot due to its larger density and higher isoelectric point than SiC. This study reports the separation of Si/SiC and Si/Al(2)O(3) mixtures by electrophoresis and gravitational settling. At pH 9, nearly uncharged Al(2)O(3) settled quickly and the negatively charged Si moved toward the anode, leading to an obvious Si distribution on the cell bottom. The experimental results show the separation performance of Si and Al(2)O(3) at pH 9 was better than at pH 2.5, and the performance was higher than that between Si and SiC. The minimum and maximum Al(2)O(3) contents remaining in Si/Al(2)O(3) mixture were 9 wt% and 90 wt% after applying 1 V/cm for 24h at pH 9. The recovered material with high Si content can be considered as a new Si source for solar cell, and the abrasives can be reused in the sawing process. PMID:21402439

Tsai, Tzu-Hsuan

2011-05-15

71

Circular saw-associated fatality mimicking gunshot injury.  

PubMed

A 61-year-old man was found dead in the yard of his house with penetrating injury of the trunk. Initial examination of the body revealed a single penetrating injury on his chest with a collar abrasion-the injury pattern that is similar to a gunshot entry wound or shored exit wound. According to witnesses, the man had cut wooden frames from old windows with a circular saw. X-rays of the torso revealed a contrast object resembling a projectile in the left scapular region. The internal examination disclosed an isolated trunk trauma involving the left lung. In the soft tissue, between the inner edge of the left scapula and thoracic spine, the fragment of a metal nail was found. The autopsy confirmed that the wound on the chest was a non-firearm-related injury. The death of deceased was attributed to massive internal hemorrhage. Further investigation revealed that the pseudo-gunshot wound injury of the trunk of the victim was caused by a fast-flying metal object thrown against the man's trunk from a circular saw while cutting the wooden beams of old windows. PMID:23181567

Hejna, Petr; Zátopková, Lenka; Safr, Miroslav; Straka, Lubomír

2013-01-01

72

A SAW resonator with two-dimensional reflectors.  

PubMed

It is known that a part of the loss of leaky SAW resonators is due to radiation of acoustic energy in the bus-bars. Many researchers are working on so-called phononic crystals. A 2-D grating of very strong reflectors allows these devices to fully reflect, for a given frequency band, any incoming wave. A new device based on the superposition of a regular SAW resonator and a 2-D periodic grating of reflectors is proposed. Several arrangements and geometries of the reflectors were studied and compared experimentally on 48 degrees rotated Y-cut lithium tantalate. In particular, a very narrow aperture (7.5 lambda) resonator was manufactured in the 900 MHz range. Because of its small size, this resonator has a resonance Q of only 575 when using the standard technology, whereas a resonance Q of 1100 was obtained for the new device without degradation of the other characteristics. Because of the narrow aperture, the admittance of the standard resonator showed a very strong parasitic above the resonance frequency, whereas this effect is drastically reduced for the new device. These results demonstrate the feasibility of the new approach. PMID:20040423

Solal, Marc; Gratier, Julien; Kook, Taeho

2010-01-01

73

Side radiation of Rayleigh waves from synchronous SAW resonators.  

PubMed

Surface acoustic wave (SAW) resonators on lithium tantalate (LiTaO3) and lithium niobate (LiNbO3) are investigated. The amplitude of the acoustic fields in the resonators are measured using a scanning laser interferometer. The amplitude profiles of the surface vibrations reveal the presence of distinct acoustic beams radiated from the transducer region of the SAW resonators and propagating with low attenuation. We suggest that this radiation is generated by the charges accumulating at the tips of the finger electrodes. The periodic system of sources, namely oscillating charges at the fingertips, generates Rayleigh-wave beams in the perpendicular and oblique directions. Green's function theory is used to calculate the coupling strength and slowness of the Rayleigh waves on 42 degrees Y-cut LiTaO3 and Y-cut LiNbO3 substrates as a function of the propagation direction. Furthermore, the propagation angles of the Rayleigh-wave beams as a function of frequency are calculated. The computed angles are compared with the measured ones for both the LiTaO3 and LiNbO3 substrates. PMID:17441596

Holmgren, Olli; Makkonen, Tapani; Knuuttila, Jouni V; Kalo, Mikko; Plessky, Victor P; Steichen, William

2007-04-01

74

Analysis of the SAW propagation in langasite crystal by X-ray topography  

Microsoft Academic Search

X-ray Bragg diffraction on the X, Y, and (011) cuts of a langasite crystal (La3Ga5SiO14, LGS) modulated by a Rayleigh surface acoustic wave (SAW) has been studied using a high-resolution X-ray topography method. This X-ray topography technique was used for direct imaging of the standing SAW in LGS, to measure the SAW amplitudes and power flow angles, to visualize the

D. V. Roshchupkin; H. D. Roshchupkina; D. V. Irzhak; O. A. Buzanov

2004-01-01

75

A wireless pressure-measurement system using a SAW hybrid sensor  

Microsoft Academic Search

A pressure-measurement system based on surface-acoustic-wave (SAW) sensors is presented in this paper. Since SAW sensors are powered by the energy of the RF field, no battery is required, which is a major drawback of conventional microcontroller-based telemetry systems. A successful combination of a SAW reflective delay line with a high-Q capacitive pressure sensor is shown, With a new way

Gernot Schimetta; Franz Dollinger; Robert Weigel

2000-01-01

76

Pure SH SAW on single crystal KNbO3 for liquid sensor applications  

Microsoft Academic Search

This paper reports on the design, fabrication, and testing of a surface acoustic wave (SAW) delay line on single crystal KNbO3 Euler angles (0°,90°, 0°). This particular orientation of KNbO3 is of symmetry Type 4, which is known to support an electromechanically active shear horizontal (SH) SAW mode, and has a very large electromechanical coupling coefficient of 53%. The SH-SAW

T. B. Pollard; J. F. Vetelinop; M. Pereira da Cunha

2003-01-01

77

Corrosion inhibitors for water-base slurry in multiblade sawing  

NASA Astrophysics Data System (ADS)

The use of a water-base slurry instead of the standard PC oil vehicle was proposed for multiblade sawing (MBS) silicon wafering technology. Potential cost savings were considerable; however, significant failures of high-carbon steel blades were observed in limited tests using a water-based slurry during silicon wafering. Failures were attributed to stress corrosion. A specially designed fatigue test of 1095 steel blades in distilled water with various corrosion inhibitor solutions was used to determine the feasibility of using corrosion inhibitors in water-base MBS wafering. Fatigue tests indicate that several corrosion inhibitors have significant potential for use in a water-base MBS operation. Blade samples tested in these specific corrosion-inhibitor solutions exhibited considerably greater lifetime than those blades tested in PC oil.

Chen, C. P.; Odonnell, T. P.

1982-02-01

78

A Novel Toxic Gases Detection System Based on SAW Resonator Array and Probabilistic Neural Network  

Microsoft Academic Search

Surface acoustic wave (SAW) resonator array as the key element for analytical sensor system is a very promising technique for toxic gases detection. In this work, a novel analytical system based on high Q-value surface acoustic wave (SAW) resonator array and probabilistic neural network (PNN) was developed to detect toxic gases such as chemical warfare agents or the simulant. The

Chen Chuanzhi; Ma Jinyi; Zuo Boli; Jiang Hongmin

2007-01-01

79

Is the Norther n Saw-whet Owl ( Aegolius acadicus ) Nomadic? Jeffrey S. Marks1  

E-print Network

Is the Norther n Saw-whet Owl ( Aegolius acadicus ) Nomadic? Jeffrey S. Marks1 Expanded Abstract.--The first r ecorded nesting of a Norther n Saw- whet Owl (Aegolius acadicus) in the Snake River Bir ds owls, nomadism is best documented in Boreal [Tengmalm's] Owls (Aegolius funereus) that feed on voles

80

Miniaturization and Optimization of RF SAW Filter Using Wafer Level Packaging Technology  

Microsoft Academic Search

In this paper, we describes the wafer level surface acoustic wave (SAW) filter package, 1.0times0.8 mm2, which is applicable for radio frequency (RF) stage in mobile phones. The SAW filter is reduced in size and thickness by using a 4\\

Tae Hoon Kim; Won Kyu Jeung; Si Joong Yang; Seog Moon Choi; Seung Wook Park; Hyun Ho Kim; J. Ha; Mi Jin Park; S. Kao; J. P. Hong; Sung Yi; Jun Sik Hwang; Ji Hyuk Lim; Woon Bae Kim

2007-01-01

81

System-in-a-package integration of SAW RF Rx filter stacked on a transceiver chip  

Microsoft Academic Search

Demands for mobile phones with smaller form factor and lower cost have driven enhanced integration of electronics components. However, surface acoustic wave (SAW) filters must be fabricated on piezoelectric substrates, and so they are difficult to monolithically integrate on semiconductor chips. This paper reports on a compact wafer-scale packaged SAW filter stacked over a transceiver chip in a quad flat-pack

Robert E. Jones; Chandra Ramiah; T. Kamgaing; S. K. Banerjee; Chi-Taou Tsai; H. G. Hughes; A. P. De Silva; J. Drye; Li Li; W. Blood; Qiang Li; C. R. Vaughan; R. Miglore; D. Penunuri; R. Lucero; D. R. Frear; M. F. Miller

2005-01-01

82

An Investigation of the Heat Affected Zone in Cortical Bone Sawing  

Microsoft Academic Search

Surgical procedures such as osteotomy and hip replacement involve the cutting of bone with the aid of various manual and powered cutting instruments including manual and powered bone saws. Frictional rubbing between the blade of the saw and the bone results in the generation of localised heating of the cut bone and increased cutting forces (Ark et al, 1997). Overheating

Hamid Khalili Parsa; Ger Reilly; Brendan McCormack; Andrew Macey

2005-01-01

83

SH-SAW PROPAGATION IN A PIEZOELECTRIC STRUCTURE WITH VISCOELASTIC LAYER  

E-print Network

93 SH-SAW PROPAGATION IN A PIEZOELECTRIC STRUCTURE WITH VISCOELASTIC LAYER Jing CUI, Jian-ke DU on the properties of the SH-SAW are figured and presented. Keywords: Shear horizontal waves; Piezoelectric to the electronic industry. In 1911, Love [2] analyzed the shear horizontal surface acoustic waves (SH

Wang, Ji

84

BEHAVIOR OF A RADIO-TAGGED SAW-WHET OWL JAMESE. FORBESAND DWAIN W. WARNER  

E-print Network

BEHAVIOR OF A RADIO-TAGGED SAW-WHET OWL JAMESE. FORBESAND DWAIN W. WARNER BECAUSEof the difficulty History Area approximately30 miles north of Minneapolis,Minnesota. MET·IODS A Saw-whet Owl of undetermined was seen once more before the radio stopped transmitting at 1545 17 November 1965. Owl activity

Minnesota, University of

85

Differential phase shift keying direct sequence spread spectrum single SAW based correlator receiver  

Microsoft Academic Search

This paper presents a SAW based correlator receiver for a Differential Phase Shift Keying Direct Sequence Spread Spectrum (DPSK\\/DSSS) receiver. The DPSK modulation format allows the noncoherent data demodulation while the SAW device correlator acts as the despreading operator. In a conventional DPSK receiver, the received signal is normally split into a lower and upper path. One of the paths

F. Moeller; A. Rabah; M. Richie; M. A. Belkerdid; D. C. Malocha

1994-01-01

86

Langasite SAW Device with Gas-Sensitive Layer Peng Zheng1,2  

E-print Network

temperature langasite SAW oxygen sensors us- ing ZnO as a resistive sensing layer were fabricated and tested-Keyword: surface scoustic wave; langasite; zinc oxide; oxygen sensor; high temperature; sputtering; spin coating I-temperature surface acoustic wave (SAW) oxygen sensor. We consider wired operation only but such sensors can also

Greve, David.W.

87

Pure SH-SAW propagation, transduction and measurements on KNbO3.  

PubMed

Potassium niobate (KNbO3) supports the electromechanically active pure shear horizontal surface acoustic wave (SH-SAW) mode along Z-axis cylinder orientations, Euler angles (phi, 90 degrees, 0 degrees), in which two uncoupled wave solutions exist: a purely mechanical sagittal Rayleigh SAW and a piezoelectrically stiffened pure SH-SAW. Within this family of cuts, a maximum electromechanical coupling coefficient for the pure SH-SAW, K2 = 53%, is observed along (0 degrees, 90 degrees, 0 degrees). This pure SH-SAW orientation also has the maximum value of electromechanical coupling observed along rotated Y-cut X propagation directions, Euler angles (0 degrees, theta, 0 degrees). The use of the pure SH-SAW mode is attractive for liquid-sensing applications because the SH-SAW is modestly attenuated by the adjacent liquid, unlike the generalized SAW (GSAW), which has particle displacement normal to the surface. This work investigates propagation and excitation properties of the SH-SAW and the shear horizontal bulk acoustic wave (SH-BAW) on single crystal KNbO3, Euler angles (0 degrees, 90 degrees, 0 degrees). Interdigital transducer (IDT) arrays are analyzed using boundary element method (BEM) techniques, addressing IDT properties such as: power partitioning between the SH-SAW and SH-BAW, SH-BAW radiation as a function of wave vector direction and radiation angle, and overall IDT impedance. The percentage of SH-SAW power to total input power is above 98% for IDTs containing 1.5 to 5.5 wavelengths of active electrodes with surrounding metalized regions. For nonmetalized regions outside the IDT, the ratio drops to between 1 and 2%, showing the importance of an energy trapping structure for efficient SH-SAW excitation and propagation along this orientation. Simulated and experimental IDT admittance results are compared, verifying the validity of the analysis performed. The reported measurements on the frequency variation with temperature indicate that the orientation considered is temperature compensated at about 8 degrees C. The surface of the SH-SAW devices fabricated have been loaded with deionized water and showed additional 1.6 dB transmission loss with respect to the unloaded surface, verifying the suitability of the pure SH-SAW mode on KNbO3 for liquid sensor applications. PMID:16471447

Pollard, Thomas B; Kenny, Thomas D; Vetelino, John F; da Cunha, Mauricio Pereira

2006-01-01

88

Calibration of the QCM/SAW Cascade Impactor for Measurement of Ozone in the Stratosphere  

NASA Technical Reports Server (NTRS)

The Quartz Crystal Microbalance Surface Acoustic Wave (QCM/SAW) cascade impactor collects size-fractionated distributions of aerosols on a series of 10 MHz quartz crystals and employs SAW devices coated with chemical sensors for gas detection. Presently, we are calibrating the ER-2 certified QCM/SAW cascade impactor in the laboratory for the detection of ozone. Experiments have been performed to characterize the QCM and SAW mass loading, saturation limits, mass frequency relationships, and sensitivity. We are also characterizing sampling efficiency by measuring the loss of ozone on different materials. There are parallel experiments underway to measure the variations in the sensitivity and response of the QCM/SAW crystals as a function of temperature and pressure. Results of the work to date will be shown.

Wright, Cassandra K.; Sims, S. C.; Peterson, C. B.; Morris, V. R.

1997-01-01

89

Idealized analysis of SAW longitudinally coupled resonator filters.  

PubMed

A surface acoustic wave (SAW) longitudinally coupled resonator (LCR) filter consists of either two or three interdigital transducers located between two strongly reflecting gratings. The behavior of this structure is, in general, very complex because the transducers are of the single-electrode type, which gives strong electrode reflections. It is shown here that, for the filter passband, a number of realistic assumptions can be used to derive a very simple set of approximate relations for the device Y-matrix. The simplifications involve reciprocity, symmetry, and power conservation. The theory also uses the necessary fact that each grating, combined with its adjacent transducer, must have high directivity so that application of a voltage results in wave generation primarily toward the center of the device. For a three-transducer device, it is shown using symmetry that the central transducer behaves as if it were transparent, despite having strong electrode reflections. Hence, the device behaves as a single resonant cavity. The simple Y-matrix formulae are shown to agree very well with accurate results obtained by a coupling-of-modes (COM) analysis for both types of device. They also lead to simple formulae for the electrical loading required to obtain a flat, low-loss filter response. Equivalent circuits also are discussed. PMID:15478978

Morgan, David P

2004-09-01

90

Method and apparatus for improved wire saw slurry  

DOEpatents

A slurry recycle process for use in free-abrasive machining operations such as for wire saws used in wafer slicing of ingots, where the used slurry is separated into kerf-rich and abrasive-rich components, and the abrasive-rich component is reconstituted into a makeup slurry. During the process, the average particle size of the makeup slurry is controlled by monitoring the condition of the kerf and abrasive components and making necessary adjustments to the separating force and dwell time of the separator apparatus. Related pre-separator and post separator treatments, and feedback of one or the other separator slurry output components for mixing with incoming used slurry and recirculation through the separator, provide further effectiveness and additional control points in the process. The kerf-rich component is eventually or continually removed; the abrasive-rich component is reconstituted into a makeup slurry with a controlled, average particle size such that the products of the free-abrasive machining method using the recycled slurry process of the invention are of consistent high quality with less TTV deviation from cycle to cycle for a prolonged period or series of machining operations.

Costantini, Michael A. (Hudson, NH); Talbott, Jonathan A. (Amherst, NH); Chandra, Mohan (Merrimack, NH); Prasad, Vishwanath (East Setauket, NY); Caster, Allison (Nashua, NH); Gupta, Kedar P. (Merrimack, NH); Leyvraz, Philippe (Nashua, NH)

2000-09-05

91

76 FR 62678 - Table Saw Blade Contact Injuries; Advance Notice of Proposed Rulemaking; Request for Comments and...  

Federal Register 2010, 2011, 2012, 2013

...CPSC-2011-0074] Table Saw Blade Contact Injuries; Advance Notice of Proposed...injury associated with table saw blade contact, the regulatory alternatives discussed...including any personal identifiers, contact information, or other personal...

2011-10-11

92

Calibration of the QCM/SAW Cascade Impactor for Measurement of Ozone  

NASA Technical Reports Server (NTRS)

The Quartz Crystal Microbalance Surface Acoustic Wave (QCM/SAW) cascade impactor is an instrument designed to collect size-fractionated distributions of aerosols on a series of quartz crystals and employ SAW devices coated with chemical sensors for gas detection. We are calibrating the cascade impactor in our laboratory for future deployment for in-situ experiments to measure ozone. Experiments have been performed to characterize the QCM and SAW mass loading, saturation limits, mass frequency relationships, and sensitivity. The characteristics of mass loading, saturation limits, mass-frequency relationships, sensitivity, and the loss of ozone on different materials have been quantified.

Williams, Cassandra K.; Peterson, C. B.; Morris, V. R.

1997-01-01

93

The electron and neutron EDM from supersymmetric see-saw thresholds  

NASA Astrophysics Data System (ADS)

We consider the corrections that arise at one loop when integrating out heavy fields in supersymmetric models. We show that, in type-I see-saw models, complex AN- and BN-terms of the heavy right-handed neutrino give radiative contributions to the neutron EDM, as well as new dominant contributions to the electron EDM. Type-II and type-III see-saw also predict a pure gauge correction that makes complex the masses of the weak gauginos. All the see-saw models can predict observable EDM for the electron and for the neutron in a peculiar ratio.

Giudice, Gian F.; Paradisi, Paride; Strumia, Alessandro

2010-10-01

94

Incr easing Mist Net Captur es of Migrant Norther n Saw-whet Owls (Aegolius acadicus ) with an Audiolur e  

E-print Network

Incr easing Mist Net Captur es of Migrant Norther n Saw-whet Owls (Aegolius acadicus of br oadcast amplified "solicitation" calls of Norther n Saw-whet Owls (Aegolius acadicus) nor mally netting operations ar e also presented. Each year mor e Norther n Saw-whet Owls (Aegolius acadicus

95

2nd Owl Symposium Population Densities of Northern Saw-whet Owls (Aegolius acadicus) in Degraded Boreal  

E-print Network

2nd Owl Symposium Population Densities of Northern Saw-whet Owls (Aegolius acadicus) in Degraded population of the Northern Saw-whet Owl (Aegolius acadicus) breeds in the montane spruce-fir forests Appalachians. The Northern Saw-whet Owl (Aegolius acadicus acadicus Gmelin) is a widespread and common owl

96

Autumn Populations and Movements of Migrant Northern Saw-whet Owls (Aegolius acadicus) at Little Suamico, Wisconsin  

E-print Network

Autumn Populations and Movements of Migrant Northern Saw-whet Owls (Aegolius acadicus) at Little.--Northern Saw-whet Owls (Aegolius acadicus) were once considered a "rare" bird in Wisconsin. In the 1960's mist. Today more Northern Saw-whet Owls (Aegolius acadicus) are banded each year in North America than any

97

Method for nondestructive testing of the film coating behavior of surface acoustic wave (SAW) sensors  

NASA Astrophysics Data System (ADS)

This paper presents a practical non-destructive method for studying the film coating behavior of SAW devices by using a water soluble dielectric film (manitol) deposited on the SAW device surface by resistive evaporation. After measuring the electrical parameters of the film coated SAW device, the film can easily be removed from its surface by water rinsing without causing any damage to it. The SAW device can then be used over and over again in a large number of film depositions. The method was tested on a 1 GHz surface transverse wave (STW) resonator coated with manitol of varying thickness. After each coating and evaluation, the STW device was successfully recovered without significant performance degradation. Data is presented on the electrical changes of the STW device as a result of depositing manitol coatings of various thicknesses.

Taslakov, M. A.; Avramov, I. D.

2010-04-01

98

Full Dynamic Reactions in the Basic Shaft Bearings of Big Band Saw Machines  

NASA Astrophysics Data System (ADS)

The band saws machines are a certain class woodworking machines for longitudinal or transversal cutting as well as for curvilinear wood cutting. These machines saw the wood through a band-saw blade and two feeding wheels. These wheels usually are very large and they are produced with inaccuracies. The centre of mass of the disc is displaced from the axis of rotation of the distance e (eccentricity) and the axis of the disk makes an angle with the axis of rotation. In this paper, the dy- namic reactions in the bearings of the basic shaft, which drives the band saw machines, are analyzed. These reactions are caused by the external loading and the kinematics and the mass characteristics of the rotating disk. The expressions for the full dynamic reactions are obtained. These expressions allow the parameters of the machines to be chosen in such a way that the loading in the shaft and the bearings to be minimal.

Marinov, Boycho

2013-03-01

99

Resonant Frequency Characteristics of a SAW Device Attached to Resonating Micropillars  

PubMed Central

Recently we reported experimental and simulation results on an increase in resonance frequency of a SAW resonator caused by mass loading of micropillars made of SU-8, attached normal to the surface of the resonator. We concluded that SAW resonator and the SU-8 micropillars in unison form a system of coupled resonators. We have now extended this work and performed a finite element method simulation to study the resonance frequency characteristics of the SAW-based coupled resonator. In this paper we report the effect of the resonance frequency of the micropillars on the resonance frequency of the system of coupled resonators, and observe the coupling of micropillar resonance and the propagating SAW as described in the well known Dybwad system of coupled resonators. PMID:22666001

Ramakrishnan, N.; Nemade, Harshal B.; Palathinkal, Roy Paily

2012-01-01

100

Slicing of single crystal and polycrystalline silicon ingots using multi-blade saws  

NASA Technical Reports Server (NTRS)

Optimization of the Multi-Blade Slurry wafering technique was evaluated. Several wafering runs were made. Sufficient data necessary for a complete cost analysis of each of the three types of saw utilized are provided.

Ross, J. B.

1980-01-01

101

See What the Astronauts Saw Check out photographs of Apollo missions to the  

E-print Network

See What the Astronauts Saw Check out photographs of Apollo missions to the Moon throughout the 1st rock within the wall near the bronze Moon model. It was retrieved by Apollo 15 astronauts. · What does

102

Integration of SAW RF Rx filter stacked on a transceiver chip in a QFN package  

Microsoft Academic Search

Enhanced integration of mobile phone components is driven by demands for reduced form factor and cost. Because SAW filters must be fabricated on piezoelectric substrates, they are difficult to monolithically integrate on semiconductor chips. Here we report on the integration of a compact wafer-scale packaged SAW filter stacked over a transceiver chip in a quad flat-pack no-lead (QFN) package. An

Robert E. Jones; Chandra Ramiah; T. Kamgaing; S. K. Banerjee; Chi-Taou Tsai; H. Hughes; A. De Silva; J. Drye; C. Vaughan; R. Miglore; D. Penunuri; R. Lucero; D. R. Frear; M. Miller

2004-01-01

103

SAW oscillator multi-chip module for 300 MHz low power radio  

Microsoft Academic Search

A new SAW multi-chip module oscillator using a GaAs IC which has low power consumption characteristics is described in this paper. Firstly, the circuit configuration of the module is mentioned, where SAW resonator and GaAs IC chips are used. The GaAs IC has both functions of oscillation and modulation. Secondly, the design of the two chips and the module construction

Hiroaki Tanaka; Tsutomu Ieki; Yasuhiko Hirano; Youhei Ishikawa

1997-01-01

104

Historical storminess and climate ‘see-saws’ in the North Atlantic region  

Microsoft Academic Search

The existence of a well-defined climate ‘see-saw’ across the North Atlantic region and surrounding areas has been known for over 200 years. The occurrence of severe winters in western Greenland frequently coincides with mild winters in northern Europe. Conversely, mild winters in western Greenland are frequently associated with cold winters across northern Europe. Whereas this ‘see-saw’ is normally discussed in

A. Dawson; L. Elliott; S. Noone; K. Hickey; T. Holt; P. Wadhams; I. Foster

2004-01-01

105

SAW velocities in X-cut LiTaO3  

Microsoft Academic Search

SAW (surface acoustic wave) devices based on propagation in 112.2° Y-rotated X-cut LiTaO3 were investigated. The SAW propagation velocity in the entire X-surface was characterized by laser-probe measurements. Results obtained include velocities for free and shorted surfaces. The effect of metal loading on velocity has been measured. The results are given as trigonometric expansions with tabulated coefficients

M. Anhorn; H. E. Engan

1989-01-01

106

Fabrication and optimization of wafer level SAW filter package using laser via drilling  

Microsoft Academic Search

Wafer level surface acoustic wave (SAW) filter package, 0.8times0.6 mm2, is drilled by laser via process. Via formation for interconnection is based on smaller package manufacture. LT (LiTaO3) which is base material of SAW filter is difficult to drill a small via by RIE (Reactive Ion Etching) because the RIE gets a very small etch rate and has wafer broken

Seung Wook Park; Ju Pyo Hong; Tae Hoon Kim; Si Joong Yang; Job Ha; Tae Ho Kim; Sang Wook Park; Young Do Kweon; Sung Yi

2008-01-01

107

SH-SAW transducer analysis on single crystal KNbO3 for liquid sensors  

Microsoft Academic Search

A BEM numerical analysis of IDT structures on Euler angles (0°, 90°, 0°) KNbO3 has been performed. The analysis considered IDT excitation of both the SH-SAW and SH-BAW modes. The results were targeted at addressing specific issues relevant to liquid sensor applications, such as power partitioning between the SH-SAW and SH-BAW, and SH-BAW power radiation direction into the substrate. The

T. B. Pollard; T. D. Kenny; Pereira da Cunha

2004-01-01

108

Mass sensitivity calculation of the protein layer using love wave SAW biosensor.  

PubMed

Love waves, a variety of surface acoustic waves (SAWs), can be used to detect very small biological surface interactions and so have a wide range of potential applications. To demonstrate the practicality of a Love wave SAW biosensor, we fabricated a 155-MHz Love wave SAW biosensor and compared it with a commercial surface Plasmon resonance (SPR) using glycerol-water solution with known densities and viscosities to calibrate the response signals of the biosensors. And the mass per unit area of anti-mouse IgG bound with protein G onto the sensitive layer of the biosensor was calculated on the basis of the calibration result. The sensitivity of the Love wave SAW biosensor was the same as or greater than that of the SPR biosensor. Furthermore, the Love wave SAW biosensor was capable of measuring a much wider range of viscosities than the SPR biosensor. Although the operating principle of the Love wave SAW biosensor is completely different from that of the SPR biosensor, the subtle changes in the viscoelastic properties of the biological layer that accompany biological binding reactions on the sensitive layer can be monitored and measured in the same ways as with the SPR biosensor. PMID:22966717

Lee, Sangdae; Kim, Ki Bok; Il Kim, Yong

2012-07-01

109

A Reduced Three Dimensional Model for SAW Sensors Using Finite Element Analysis  

PubMed Central

A major problem that often arises in modeling Micro Electro Mechanical Systems (MEMS) such as Surface Acoustic Wave (SAW) sensors using Finite Element Analysis (FEA) is the extensive computational capacity required. In this study a new approach is adopted to significantly reduce the computational capacity needed for analyzing the response of a SAW sensor using the finite element (FE) method. The approach is based on the plane wave solution where the properties of the wave vary in two dimensions and are uniform along the thickness of the device. The plane wave solution therefore allows the thickness of the SAW device model to be minimized; the model is referred to as a Reduced 3D Model (R3D). Various configurations of this novel R3D model are developed and compared with theoretical and experimental frequency data and the results show very good agreement. In addition, two-dimensional (2D) models with similar configurations to the R3D are developed for comparison since the 2D approach is widely adopted in the literature as a computationally inexpensive approach to model SAW sensors using the FE method. Results illustrate that the R3D model is capable of capturing the SAW response more accurately than the 2D model; this is demonstrated by comparison of centre frequency and insertion loss values. These results are very encouraging and indicate that the R3D model is capable of capturing the MEMS-based SAW sensor response without being computationally expensive. PMID:22303156

El Gowini, Mohamed M.; Moussa, Walied A.

2009-01-01

110

Optimal selection of piezoelectric substrates and crystal cuts for SAW-based pressure and temperature sensors.  

PubMed

In this paper, the perturbation method is used to study the velocity shift of surface acoustic waves (SAW) caused by surface pressure and temperature variations of piezoelectric substrates. Effects of pressures and temperatures on elastic, piezoelectric, and dielectric constants of piezoelectric substrates are fully considered as well as the initial stresses and boundary conditions. First, frequency pressure/temperature coefficients are introduced to reflect the relationship between the SAW resonant frequency and the pressure/temperature of the piezoelectric substrates. Second, delay pressure/temperature coefficients are introduced to reflect the relationship among the SAW delay time/phase and SAW delay line-based sensors' pressure and temperature. An objective function for performance evaluation of piezoelectric substrates is then defined in terms of their effective SAW coupling coefficients, power flow angles (PFA), acoustic propagation losses, and pressure and temperature coefficients. Finally, optimal selections of piezo-electric substrates and crystal cuts for SAW-based pressure, temperature, and pressure/temperature sensors are derived by calculating the corresponding objective function values among the range of X-cut, Y-cut, Z-cut, and rotated Y-cut quartz, lithium niobate, and lithium tantalate crystals in different propagation directions. PMID:17571819

Zhang, Xiangwen; Wang, Fei-Yue; Li, Li

2007-06-01

111

SSBW to PSAW conversion in SAW devices using heavy mechanical loading.  

PubMed

The development of efficient computation tools based on mixed analytical and numerical calculation approaches allows precise descriptions and characterizations of surface acoustic waves (SAW) propagation, taking into account realistic electrical and mechanical boundary conditions. As an example, suppression of the leaky SAW, also called pseudo SAW (PSAW), attenuation has been predicted using such tools allowing to explain experimental occurrences for SAW devices on YX cut lithium niobate and lithium tantalate with thick aluminum strip gratings (6% < h/lambda < 10%). In this work, such a theoretical model is used to analyze the evolution of surface waves on standard YX lithium tantalate cuts versus aluminum strip height. It is shown that the surface skimming bulk wave (SSBW), which accompanies the pseudo SAW on such crystal orientations, may be trapped by the grating, exhibiting then a second pseudo SAW behavior when close to the Bragg condition. A device has been designed and fabricated to check these theoretical predictions. The experimental evidence of the existence of the phenomenon allows one to discuss its consequences on more classical devices built on (Y+36 degrees,X) LiTaO3 substrates. PMID:12075973

Fusero, Yann; Ballandras, Sylvain; Desbois, Jean; Hodé, Jean-Michel; Ventura, Pascal

2002-06-01

112

An interrogation unit for passive wireless SAW sensors based on fourier transform.  

PubMed

The application of surface acoustic wave (SAW) resonators as sensor elements for different physical parameters such as temperature, pressure, and force has been well-known for several years. The energy storage in the SAW and the direct conversion from physical parameter to a parameter of the wave, such as frequency or phase, enables the construction of a passive sensor that can be interrogated wireless. This paper presents a temperature-measurement system based on passive wireless SAW sensors. The principle of SAW sensors and SAW sensor interrogation is discussed briefly. A new measurement device developed for analyzing the sensor signals is introduced. Compared to former interrogation units that detect resonance frequency of the SAW resonator by comparing amplitudes of sensor response signals related to different stimulating frequencies, the new equipment is able to measure the resonance frequency directly by calculating a Fourier transformation of the resonator response signal. Measurement results of an experimental setup and field tests are presented and discussed. PMID:15600089

Hamsch, Matthias; Hoffmann, Rene; Buff, Werner; Binhack, Michael; Klett, Stefan

2004-11-01

113

Predicting the Performance of Chain Saw Machines Based on Shore Scleroscope Hardness  

NASA Astrophysics Data System (ADS)

Shore hardness has been used to estimate several physical and mechanical properties of rocks over the last few decades. However, the number of researches correlating Shore hardness with rock cutting performance is quite limited. Also, rather limited researches have been carried out on predicting the performance of chain saw machines. This study differs from the previous investigations in the way that Shore hardness values (SH1, SH2, and deformation coefficient) are used to determine the field performance of chain saw machines. The measured Shore hardness values are correlated with the physical and mechanical properties of natural stone samples, cutting parameters (normal force, cutting force, and specific energy) obtained from linear cutting tests in unrelieved cutting mode, and areal net cutting rate of chain saw machines. Two empirical models developed previously are improved for the prediction of the areal net cutting rate of chain saw machines. The first model is based on a revised chain saw penetration index, which uses SH1, machine weight, and useful arm cutting depth as predictors. The second model is based on the power consumed for only cutting the stone, arm thickness, and specific energy as a function of the deformation coefficient. While cutting force has a strong relationship with Shore hardness values, the normal force has a weak or moderate correlation. Uniaxial compressive strength, Cerchar abrasivity index, and density can also be predicted by Shore hardness values.

Tumac, Deniz

2014-03-01

114

Effect of multiblade slurry saw induced damage on silicon solar cells  

NASA Technical Reports Server (NTRS)

A correlation between the optimum etch loss and the depth of damage is established using wafers produced by the Multiblade Slurry (MBS) and the Internal Diameter (ID) saws. The observations are based on the measurement of the performance of solar cells fabricated on these wafers. Sample preparation and test results are described and the following conclusions are made: (1) the amount of silicon removal necessary for optimum solar cell performance coincides with the depth of saw-induced damage; (2) optimization of cell performance is not affected by the method of silicon removal; (3) sawing conditions should be optimized to minimize the extent of saw-induced damage; (4) the MBS saw is found to induce damage to a lesser extent; (5) since the extent of damage in MBS-sawn wafers is in the limit of etch loss required in texture etching, it is possible to achieve optimum improvement in cell performance by merely texture etching the surface of as-sawn wafers.

Daud, T.; Liu, J. K.; Pollock, G. A.; Koliwad, K. M.

1978-01-01

115

Integrated active mixing and biosensing using surface acoustic waves (SAW) and surface plasmon resonance (SPR) on a common substrate.  

PubMed

This article presents a device incorporating surface plasmon resonance (SPR) sensing and surface acoustic wave (SAW) actuation integrated onto a common LiNbO(3) piezoelectric substrate. The device uses Rayleigh-type SAW to provide active microfluidic mixing in the fluid above the SPR sensor. Validation experiments show that SAW-induced microfluidic mixing results in accelerated binding kinetics of an avidin-biotin assay. Results also show that, though SAW action causes a parasitic SPR response due to heat injection into the fluid, a relatively brief relaxation time following the SAW pulses allows the effect to dissipate, without affecting the overall assay response. Since both SPR sensors and SAW transducers can be fabricated simultaneously using low-cost microfabrication methods on a single substrate, the proposed design is well-suited to lab-on-chip applications. PMID:20024058

Renaudin, Alan; Chabot, Vincent; Grondin, Etienne; Aimez, Vincent; Charette, Paul G

2010-01-01

116

Identification and quantification of individual volatile organic compounds in a binary mixture by SAW multisensor array and pattern recognition analysis  

Microsoft Academic Search

We have developed a surface acoustic wave (SAW) multisensor array with five acoustic sensing elements configured as two-port resonator 433.92 MHz oscillators and a reference SAW element to recognize different individual components and determine their concentrations in a binary mixture of volatile organic compounds (VOCs) such as methanol and acetone, in the ranges 15-130 and 50-250 ppm, respectively. The SAW

M. Penza; G. Cassano; F. Tortorella

2002-01-01

117

Maintenance of stellite and tungsten carbide saw tips: respiratory health and exposure-response evaluations.  

PubMed Central

OBJECTIVE--To study exposure to cobalt and chromium in saw maintenance rooms and test respiratory health among saw filers at lumber mills. Hard-metal lung disease is associated with cobalt in the manufacture of tungsten carbide tools; recently it has also been reported among tool maintenance workers. Lumber mills often use saws tipped with tungsten carbide or with a newer alloy, stellite (containing more cobalt, as well as chromium). METHODS--A cross sectional study of 118 saw filers at eight lumber mills was carried out that included a standardised questionnaire, spirometry, personal air sampling, and examination of tasks every 10 minutes (by observation). Comparison data were from a study of bus mechanics tested with similar methods. RESULTS AND CONCLUSION--Cobalt exposure was associated with tungsten carbide grinding but not with stellite grinding. Chromium exposure was associated mainly with stellite welding. Saw filers had a twofold increase in phlegm and wheeze (P < 0.01) and a threefold increase in cough, phlegm, and wheeze related to work (P < 0.001), but no increase in breathlessness. Stellite welding was associated with a significant increase in nasal symptoms and cough related to work and a small decrease in airflow (forced expiratory volume in one second/forced vital capacity (FEV1/FVC%), P < 0.05). Saw filers wet grinding with tungsten carbide had significant reductions in forced expiratory lung volumes (FEV1 and FVC, P < 0.05) and were significantly more likely to have FEV1 and FVC values in the abnormal range. Cobalt exposure (in wet grinding) and duration of work that involved tungsten carbide grinding were both associated with significant reductions in FEV1 and FVC. Average cobalt exposures in this study were about 5 micrograms/m3, well below the currently accepted permissible concentration, which suggests that the current workplace limit for cobalt may be too high. PMID:7735392

Kennedy, S M; Chan-Yeung, M; Marion, S; Lea, J; Teschke, K

1995-01-01

118

Accelerated binding kinetics by surface acoustic waves (SAW) micromixing in surface plasmon resonance (SPR) system for biodetection  

NASA Astrophysics Data System (ADS)

A design incorporating surface plasmon resonance (SPR) biosensing and surface acoustic wave (SAW) active microfluidic mixing, integrated on a single LiNbO3 piezoelectric substrate, is presented. Validation experiments show that SAW-mixing (microstreaming) results in accelerated binding kinetics (time-to-saturation) for a standard assay with appropriate SAW excitation parameters. Since both SPR sensors and SAW transducers can be fabricated simultaneously using low-cost microfabrication methods, the proposed design should contribute to improved lab-on-chip devices for detecting and identifying biomolecules of interest with greater accuracy and speed across multiple applications.

Renaudin, Alan; Chabot, Vincent; Grondin, Etienne; Aimez, Vincent; Charette, Paul G.

2011-02-01

119

SAW filter manufacture and piezoelectric materials evaluation based on printed electronics technology  

NASA Astrophysics Data System (ADS)

In this paper, the silver nanoparticle ink and ink-jet printing technology are used to manufacture the surface acoustic wave (SAW) filters. The characteristics of three common substrate piezoelectric materials of ST-quartz, Y36°-LiTaO3 and Y128°-LiNbO3 are evaluated. The experimental results show that Y128°-LiNbO3 matches the ink much better than others. The printed SAW filter with Y128°-LiNbO3 as piezoelectric substrate is realized, and its center frequency and bandwidth are 18.4 MHz and 500 kHz, respectively.

Liu, Xiao-chen; Li, Kun; Xuan, Xiu-wei; Cao, Yang; Teng, Jian-fu

2014-09-01

120

Large neutrino mixing angles for type-I see-saw mechanism in SO(10) GUT  

E-print Network

We consider the neutrino mixing angles in an SO(10) GUT with the usual Higgs structure in which neutrino masses are explained by the type-I see-saw mechanism. The Dirac-neutrino Yukawa matrix then has a structure similar to that of the $u$-quark. We determine the light neutrino mass matrix through type-I see-saw mechanism using the experimentally consistent $u$-quark Yukawa matrix. We find that large neutrino mixing-angles emerge naturally in this model.

Bipin R. Desai; G. Rajasekaran; U. Sarkar

2005-04-08

121

Senate Forum XXV, No. 2 Spring 2010 They Came, They Saw, They Recommended  

E-print Network

Senate Forum XXV, No. 2 Spring 2010 They Came, They Saw, They Recommended: What the WASC Visiting- fill its purposes. While on campus, the Visiting Team held open forums with various constituency groups;Senate Forum XXV, No. 2 Spring 2010 4 Recommendations In addition to our continuing focus on the three

de Lijser, Peter

122

Development of fuzzy logic system to predict the SAW weldment shape profiles  

NASA Astrophysics Data System (ADS)

A fuzzy model was presented to predict the weldment shape profile of submerged arc welds (SAW) including the shape of heat affected zone (HAZ). The SAW bead-on-plates were welded by following a full factorial design matrix. The design matrix consisted of three levels of input welding process parameters. The welds were cross-sectioned and etched, and the zones were measured. A mapping technique was used to measure the various segments of the weld zones. These mapped zones were used to build a fuzzy logic model. The membership functions of the fuzzy model were chosen for the accurate prediction of the weld zone. The fuzzy model was further tested for a set of test case data. The weld zone predicted by the fuzzy logic model was compared with the experimentally obtained shape profiles and close agreement between the two was noted. The mapping technique developed for the weld zones and the fuzzy logic model can be used for on-line control of the SAW process. From the SAW fuzzy logic model an estimation of the fusion and HAZ can also be developed.

Narang, H. K.; Mahapatra, M. M.; Jha, P. K.; Biswas, P.

2012-09-01

123

Single-atom manipulation mechanisms during a quantum corral construction Saw-Wai Hla*  

E-print Network

Single-atom manipulation mechanisms during a quantum corral construction Saw-Wai Hla* Nanoscale atoms move on the various potential energy landscapes of an Ag 111 surface during a quantum corral and tip-height to move the Ag atom across the surface are experi- mentally measured as 210 19 k and 1.3 0

Hla, Saw-Wai

124

Simultaneous and wireless measurement of CO2 and humidity using a SAW reflective delay line  

NASA Astrophysics Data System (ADS)

A 440MHz wireless and passive surface acoustic wave (SAW) based chemical sensor was developed for simultaneous measurement of CO2 gas and relative humidity (RH) using a reflective delay line pattern as the sensor element. The reflective delay line was structured by an inter-digital transducer (IDT) and several shorted grating reflectors positioned both sites of the IDTs along the SAW propagation direction. A Teflon AF 2400 film with large solubility, permeability, and selectivity towards to CO2 and a hydrophilic SiO2 layer for water vapor sensing are used as the sensitive film and deposited onto the piezoelectric substrate. A simulation on the SAW device was performed using the coupling of modes (COM). The measured reflection coefficient S11 in time domain of the fabricated SAW device shows sharp reflection peaks with high signal-to-noise (S/N) ratio, small signal attenuation, and few spurious peaks. During the CO2 and humidity testing, high sensitivity (~2o ppm-1 for CO2 detection and 7.45o/%RH for humidity sensing), good linearity and repeatability were observed in the CO2 concentration of 50~400ppm and humidity of 20~80%RH. Temperature and humidity compensations were also investigated during the sensitivity evaluation process.

Lim, Chunbae; Wang, Wen; Lee, Keekeun; Oh, Hae-Kwan; Yang, Sangsik

2009-02-01

125

Sensitivities of SAW Oscillators to Temperature, Forces and Pressure: Application to Sensors  

Microsoft Academic Search

The paper describes the sensitivity of SAW oscillators to external thermal and mechanical perturbations. It is known that the sensitivity results from the non linear elastic behavior of the crystal which couples the surface wave to the static bias. The method which is used consists in calculating the static bias in the thin plate approximation by means of Mindlin's polynomial

D. Hauden; S. Rousseau; J. J. Gagnepain

1980-01-01

126

Production Machine Shop Employment Competencies. Part Two: Saws, Drills, and Grinders.  

ERIC Educational Resources Information Center

Competencies for production machine shop are provided for the second of four topic areas: saws, drills, and grinders. Each competency appears in a one-page format. It is presented as a goal statement followed by one or more "indicator" statements, which are performance objectives describing an ability that, upon attainment, will establish…

Bishart, Gus; Werner, Claire

127

Surface Acoustic Wave (SAW) biosensors: coupling of sensing layers and measurement.  

PubMed

Surface acoustic wave (SAW) devices based on horizontally polarized surface shear waves enable direct and label-free detection of proteins in real time. Signal response changes result mainly from mass increase and viscoelasticity changes on the device surface. With an appropriate sensor configuration all types of binding reactions can be detected by determining resonant frequency changes of an oscillator. To create a biosensor, SAW devices have to be coated with a sensing layer binding specifically to the analyte. Intermediate hydrogel layers used within the coating have been proven to be very suitable to easily immobilize capture molecules or ligands corresponding to the analyte. However, aside from mass increase due to analyte binding, the SAW signal response in a subsequent binding experiment strongly depends on the morphology of the sensing layer, as this may lead to different relative changes of viscoelasticity. Bearing these points in mind, we present two basic biosensor coating procedures, one with immobilized capture molecule and a second with immobilized ligand, allowing reliable SAW biosensor signal responses in subsequent binding assays. PMID:23329462

Länge, Kerstin; Gruhl, Friederike J; Rapp, Michael

2013-01-01

128

Machine Shop. Module 4: Power Saw and Drill Press Operation. Instructor's Guide.  

ERIC Educational Resources Information Center

This document consists of materials for a six-unit course on the following topics: (1) power saw safety and maintenance; (2) cutting stock to length; (3) band machining and contouring; (4) drill press types and safety; (5) drill press work-holding devices; and (6) tools and tool holders. The instructor's guide begins with a list of competencies…

Walden, Charles H.; Daniel, Bill

129

A robust formulation of SAW Green's functions for arbitrarily thick multilayers at high frequencies  

Microsoft Academic Search

This paper presents a robust formulation of SAW Green's functions for arbitrarily thick multilayers at high frequencies. The formulation is an alternative to that based on the transfer matrix method, which suffers from numerical instabilities when the frequency and\\/or thickness parameters become large. This numerical difficulty can be attributed to the mixture of exponentially growing and decaying terms during the

Eng Leong Tan

2002-01-01

130

Mind your hand during the energy crunch: Functional Outcome of Circular Saw Hand Injuries  

Microsoft Academic Search

BACKGROUND: Although injuries due to circular saws are very common all over the world, there is surprisingly little information available about their functional outcomes. As the socioeconomic impact of these injuries is immense and determined by the casualties' disability and impairment, it is the objective of this study to present data on the functional outcome, disability, and impairment of hand

Matthias Frank; Juliane Hecht; Matthias Napp; Joern Lange; Rico Grossjohann; Dirk Stengel; Uli Schmucker; Axel Ekkernkamp; Peter Hinz

2010-01-01

131

Suppression of bulk-scattering loss in SAW resonator with quasi-constant acoustic reflection periodicity  

Microsoft Academic Search

The author proposes a SAW (surface acoustic wave) resonator structure which suppresses the bulk-scattering loss for a high reflectivity resonator. The approach uses an effective configuration to cancel the scattered radiation bulk waves from the GRs (grating reflectors) and the IDT (interdigital transducer) simultaneously. It consists of an IDT and metal-strip GRs, which are of the same material and which

Yasuo Ebata; Toshiba Electron

1988-01-01

132

A powerful novel method for the simulation of waveguiding in SAW devices  

Microsoft Academic Search

A new method to simulate waveguiding in SAW filters is presented and applied to mobile communication and consumer electronics filters. It is based on the P-matrix method and discretizes the filter into longitudinal and transversal sections. Diffraction effects are introduced by considering free waveguide propagation within the longitudinal sections. This method is an extension of the pseudoinverse diffraction matrix method

Markus Mayer; G. Kovacs; A. Bergmann; K. Wagner

2003-01-01

133

Effect of saw palmetto extract on PI3K cell signaling transduction in human glioma  

PubMed Central

Saw palmetto extract can induce the apoptosis of prostate cancer cells. The aim of the present study was to investigate the effect of saw palmetto extract on the phosphatidylinositol 3-kinase (PI3K)/Akt signaling transduction pathway in human glioma U87 and U251 cell lines. Suspensions of U87 and U251 cells in a logarithmic growth phase were seeded into six-well plates at a density of 104 cells/well. In the experimental group, 1 ?l/ml saw palmetto extract was added, while the control group was cultured without a drug for 24 h. The expression levels of PI3K, B-cell lymphoma-extra large (Bcl-xL) and p53 were evaluated through western blot analysis. In the experimental group, the U87 and U251 cells exhibited a lower expression level of PI3K protein as compared with the control group (t=6.849; P<0.001). In addition, the two cell lines had a higher expression level of p53 protein in the experimental group as compared with the control group (t=40.810; P<0.001). Protein expression levels of Bcl-xL decreased significantly in the experimental group as compared with the control group (t=19.640; P=0.000). Therefore, saw palmetto extract induces glioma cell growth arrest and apoptosis via decreasing PI3K/Akt signal transduction. PMID:25009620

YANG, YANG; HUI, LV; YUQIN, CHE; JIE, LI; SHUAI, HOU; TIEZHU, ZHOU; WEI, WANG

2014-01-01

134

The Income Volatility See-Saw: Implications for School Lunch. ERS Report Summary  

ERIC Educational Resources Information Center

Income volatility challenges the functioning of the safety net provided by U.S. Department of Agriculture (USDA) food assistance programs for low-income families in time of need. Low-income families may be on a see-saw of income changes that make it difficult for program administrators to accurately target benefits and to define sensible…

Newman, Constance

2006-01-01

135

A Monolithically Packaged Cordless Sensor System Embedding MEMS A\\/D Converter and Saw Transponder  

Microsoft Academic Search

A monolithically packaged SAW (Surface Acoustic Wave) radio transponder and pressure sensor is developed for the application to a TPMS (Tire Pressure Monitoring System). The device contains the wireless transponder, which converts analog signal into digital one without any auxillary electronic circuits and then transmits the converted data wirelessly. No power sources are needed for wireless transponder and pressure sensor.

Oh Jae-geun; Bumkyoo Choi; Seung-yop Lee

2004-01-01

136

Habitat Selection of Northern Saw-whet Owls (Aegolius acadicus brooksi) on the Queen Charlotte Islands, British Columbia  

Microsoft Academic Search

The Northern Saw-whet Owl of the Queen Charlotte Islands, British Columbia is recognized as a distinct subspecies, Aegolius acadicus brooksi. Little is known of the biology of this subspecies, and no nests have ever been found. We surveyed for Northern Saw-whet Owls on the Queen Charlotte Islands between 4 May and 28 May, 1996 establishing 10 survey routes comprising a

Michael Gill; Richard J. Cannings

137

Wavenumber domain analysis of two-dimensional SAW images captured by phase-sensitive laser probe system.  

PubMed

This paper is aimed at demonstrating how the wavenumber domain analysis of two-dimensional (2-D) images captured by phase-sensitive laser probe systems is applied in the characterization of RF SAW devices. Effectiveness is demonstrated through the selective characterization of spurious resonance modes and scattered, nonguided modes appearing in SAW resonators. PMID:17523572

Hashimoto, Ken-ya; Kamizuma, Hiroshi; Watanabe, Masashi; Omori, Tatsuya; Yamaguchi, Masatsune

2007-05-01

138

3/18/13 Oracle BI Interactive Dashboards https://ira.dartmouth.edu/analytics/saw.dll?Dashboard&_scid=LHKAECHkLEg 1/5  

E-print Network

3/18/13 Oracle BI Interactive Dashboards https://ira.dartmouth.edu/analytics/saw.dll?Dashboard&_scid;3/18/13 Oracle BI Interactive Dashboards https://ira.dartmouth.edu/analytics/saw.dll?Dashboard&_scid

Campbell, Andrew T.

139

Novel Design for Centrifugal Counter-Current Chromatography: III. Saw Tooth Column  

PubMed Central

The toroidal coil using an equilateral triangular core and zigzag pattern column have improved both retention of the stationary phase and peak resolution of the conventional toroidal coil in centrifugal counter-current chromatography. To further improve the retention of stationary phase and peak resolution, a novel saw tooth column was designed and the performance of the system was evaluated at various flow rates. The results indicated that both retention of the stationary phase and peak resolution were improved as the flow rate was decreased and at a flow rate of 0.005 ml/min the resolution is remarkably increased. Modification of the tubing called flat-twisted tubing further improved the peak resolution without increasing the column pressure. With a decreased column length at a capacity of about 0.2 ml, resolution of the saw tooth column was 1.02. PMID:20543965

Yang, Yi; Aisa, Haji Akber; Ito, Yoichiro

2009-01-01

140

Simulation research on cutting brittle optical material with diamond wire saw based on LS-DYNA  

NASA Astrophysics Data System (ADS)

The quality of optical material cutting affects the efficiency and quality of follow-up polishing processing directly. Among various ways of cutting, the diamond wire saw cutting of fixed abrasive has advantages of narrow cutting seam, efficient cutting, high chip quality, little pollution to environment, ability to process bigger diameter workpiece, etc. So it has been used widely in optical material processing. In this paper, the coupled algorithm of FEM/SPH has been used to simulate deformation, fracture of brittle optical material in diamond grain cutting. The influence of workpiece feeding rate, cutting speed and cutting depth on the surface roughness are then analyzed in detail. Numerical simulation results show that the coupled algorithm efficiently explains the mechanism of material removal. From these results, we can not only determine optimum technology parameters for the manufacture of diamond wire saw, but also provide basis for improving the wire cutting efficiency and finished-product rate of optical material.

Wang, Jian; Liu, Jianbo; Xiao, Yonghao; Zhao, Shicao

2014-08-01

141

Design and use of multiple blade slurry sawing in a production atmosphere  

NASA Technical Reports Server (NTRS)

The technique and uses of the multiple blade slurry (MBS) saw are considered. Multiple bands of steel are arranged in a frame and the frame is reciprocated with the steel bands to a workpiece, while simultaneously applying abrasive at the point of contact. The blades wear slots in the workpiece and progress through the piece resulting in several parts of wafers. The transition to MBA from diamond slicing is justified by savings resulting from minimized kerf losses, minimized subsurface damage, and improved surface quality off the saw. This allows wafering much closer to finished thickness specifications. The current state of the art MBS technology must be significantly improved if the low cost solar array (LSA) goals are to be attained. It is concluded that although MBS will never be the answer to every wafering requirement, the economical production of wafers to LSA project specifications will be achieved.

Lynah, F. P., Jr.; Ross, J. B.

1982-01-01

142

SH-SAW Sensor Platform for Chemical Detection in Aqueous Solutions  

SciTech Connect

Chemically sensitive polymers coated on delay lines utilizing shear horizontal surface acoustic wave (SH-SAW) sensors are investigated for the detection of organic analytes in liquid environments. The SH-SAW sensor platform was designed and fabricated on 36{degree} rotated Y-cut LiTaO{sub 3}. By depositing a SiO{sub 2} dielectric layer over the entire device prior to applying the polymer film, partial electrical passivation of the interdigital transducers (IDT) is obtained while increasing the mass sensitivity of the device. Changes in the mechanical properties of the chemically sensitive polymer materials were clearly detectable through a frequency shift at least one order of magnitude larger than that of a coated-quartz crystal resonator (QCR) in a similar experiment.

Casalnuovo, Steve; Cernosek, Richard; Josse, Fabien; Ricco, Antonio; Zhou, Rongnong

1999-07-20

143

New materials and multidimensional cluster analysis for SAW chemical sensor arrays  

SciTech Connect

We use six-element arrays of 97-MHz ST-quartz surface acoustic wave (SAW) devices to detect changes in thin-film mass and mechanical properties resulting from sorption of analytes by films representing two new classes of chemical sensor interface: self-assembled monolayers (SAMs) and plasma-grafted films (PGFs). While these materials do not display exceptional chemical selectivity, various combinations of the 7 different SAMs and 8 PGFs examined to produce distinct response patterns for each of 13 analytes. The analytes include aliphatic, aromatic, and chlorinated hydrocarbons; alcohols; ketones; organophosphonates; and water. Evaluation of the SAW array data using multidimensional cluster analysis techniques show that each chemical species can be correctly identified 100% of the time over the 9%- to 49%-of-saturation range using data from many combinations of four or more films.

Ricco, A.J.; Osbourn, G.C.; Bartholomew, J.W. [Sandia National Labs., Albuquerque, NM (United States); Crooks, R.M.; Chuanjing, Xu [Texas A and M Univ., College Station, TX (United States). Dept. of Chemistry; Allred, R.E. [Adherent Technologies, Inc., Albuquerque, NM (United States)

1994-05-01

144

Assessment of present state-of-the-art sawing technology of large diameter ingots for solar sheet material. Final report, September 1, 1977February 28, 1978  

Microsoft Academic Search

The objective of this program is to assess the present state-of-the-art sawing technology of large diameter silicon ingots (3'' and 4'' diameter) for solar sheet materials. During this program, work has progressed in: (1) slicing of the ingots with the multiblade slurry (MBS) saw, the multiwire slurry (MWS) saw and the I.D. saw, (2) characterization of the sliced wafers, and

Yoo

1978-01-01

145

Isolation of p-hydroxycinnamaldehyde as an antibacterial substance from the saw fly, Acantholyda parki S  

Microsoft Academic Search

We purified an antibacterial substance from larvae of the saw fly, Acantholyda parki S., and identified its molecular structure as p-hydroxycinnamaldehyde. We then synthesized it by reduction of p-hydroxycinnamic acid. The antibacterial activity of the synthetic p-hydroxycinnamaldehyde was equal to that of the authentic substance. This molecule was found to have a broad antibacterial spectrum against not only Gram-negative, but

Jae Yoon Leem; Im Ju Jeong; Kyu Tek Park; Ho Yong Park

1999-01-01

146

USING VOCAL INDIVIDUALITY TO MONITOR QUEEN CHARLOTTE SAW-WHET OWLS (AEGOLIUS A CADICUS BROOKS1)  

Microsoft Academic Search

Our goal was to assess whether male Northern Saw-whet Owls (Aegolius acadicus brooksi) in the Queen Charlotte Islands have sufficient variation in the notes of their territorial\\/advertisement call to identify individuals within and between breeding seasons. Recordings of calling bouts were collected from 24 sites over the 2-yr study period and analyzed using discriminant function analysis. Using re- cordings of

CARMEN I. HOLSCHUH; KEN A. OTTER

147

Auditory Surveys for Northern Saw-whet Owls (Aegolius acadicus) in Southern Wisconsin 1986-1996  

Microsoft Academic Search

During auditory surveys with tape playback between 13 February and 27 April during 1986-1996, our detection of calling by Northern Saw-whet Owls (Aegolius acadicus) varied dramatically and regularly in an apparent 4-year cycle: 1986, 1990, and 1994 were significantly high calling years; 1987-1989, 1992-1993, and 1995- 1996 were significantly low; and 1991 was intermediate. Calling was also significantly affected positively

Ann B. Swengel; Scott R. Swengel

148

ROAD MORTALITY OF SAW-WHET AND SCREECH-OWLS ON THE CAPE MAY PENINSULA  

Microsoft Academic Search

ABSTt^CT.--During a 10-yr study in southern New Jersey, 250 road-killed raptors of six owl and six hawk species were found during 145 km of road travel between mid-October and early April. Northern Saw-whet Owls (Aegolius acadicus) and Eastern Screech-Owls (Otus asio) accounted for 45% (N = 114) and 36% (N --- 91) of all road kills, respectively. A large percentage

GEORGE LOOS; PAUL KERLINGER

1993-01-01

149

The numerical response of breeding Northern Saw-whet Owls Aegolius acadicus suggests nomadism  

Microsoft Academic Search

We used a 13-year time series of abundance estimates of breeding Northern Saw-whet Owls (Aegolius acadicus), and of small mammals from central Ontario, Canada, to assess the numerical response of the owls to small-mammal prey species.\\u000a We found that the finite rate of increase of breeding owls was directly related to estimates of red-backed vole (Myodes gapperi) abundance. Thus, it

Jeff BowmanDebbie; Debbie S. Badzinski; Ronald J. Brooks

2010-01-01

150

Accurate prediction of dispersion and attenuation of long metal strip SAW waveguides on anisotropic substrate  

Microsoft Academic Search

As a design tool for high-precision long broadband SAW (surface acoustic wave) delay lines, a computationally simple model for strip waveguides has been improved by inclusion of parametric fits to measured anisotropy, dispersion, and attenuation of Rayleigh wave propagation both on free and metallized surfaces of LiNbO3. A heuristic approach was used to account for the effect of anisotropy in

I. Schropp; L. Reindl; H. P. Grassl; R. Weigel

1988-01-01

151

Deep-UV LED controlled AlGaN-based SAW oscillator  

Microsoft Academic Search

We have demonstrated the possibility of controlling the frequency of an AlGaN-based SAW delay-line oscillator by LEDs emitting in deep UV range. The energy bandgap of AlGaN corresponded to the cutoff wavelength of 270 nm. The deep UV LEDs used in these experiments were supplied by Sensor Electronic Technology, Inc. and had the photon energies 265 nm and 305 nm.

D. Ciplys; M. S. Shur; A. Sereika; R. Rimeika; R. Gaska; Q. Fareed; J. Zhang; X. Hu; A. Lunev; Yu. Bilenko

2006-01-01

152

SAW-based radioisotope-powered wireless RFID\\/RF transponder  

Microsoft Academic Search

We demonstrate a microfabricated 63 Ni radioisotope-powered RFID transponder realized with a SAW (surface acoustic wave) device as the transmission frequency selector. The transponder is powered by a 1.5 milli-Ci 63 Ni source which has a half-life of 100 years. We have achieved a 5mW, 10-?s long, 100MHz carrier envelope, RF pulses which occur every 3 minutes, across a 50?

Steven Tin; Amit Lal

2010-01-01

153

Temperature compensated LiTaO3\\/sapphire saw substrate for high power applications  

Microsoft Academic Search

A new temperature-compensated SAW substrate for high power applications was developed based on bonded LiTaO3\\/sapphire. Because of its small thermal expansion coefficient, large Young's modulus, and large electric resistivity, sapphire is an ideal material for a support substrate. In addition, the large thermal conductivity of sapphire brings efficient heat dissipation. Surface activated bonding was used and optimized to strongly bond

M. Miura; T. Matsuda; M. Ueda; Y. Satoh; O. Ikata; Y. Ebata; H. Takagi

2005-01-01

154

Advances in SXFA-coated SAW chemical sensors for organophosphorous compound detection.  

PubMed

A polymer-coated surface acoustic wave (SAW)-based chemical sensor for organophosphorous compound sensing at extremely low concentrations was developed, in which a dual-delay-line oscillator coated with fluoroalcoholpolysiloxane (SXFA) acted as the sensor element. Response mechanism analysis was performed on the SXFA-coated chemical sensor, resulting in the optimal design parameters. The shear modulus of the SXFA, which is the key parameter for theoretical simulation, was extracted experimentally. New designs were done on the SAW devices to decrease the insertion loss. Referring to the new phase modulation approach, superior short-term frequency stability (±2 Hz in seconds) was achieved from the SAW oscillator using the fabricated 300 MHz delay line as the feedback element. In the sensor experiment on dimethylmethylphosphonate (DMMP) detection, the fabricated SXFA-coated chemical sensor exhibited an excellent threshold detection limit up to 0.004 mg/m(3) (0.7 ppb) and good sensitivity (?485 Hz/mg/m(3) for a DMMP concentration of 2?14 mg/m(3)). PMID:22319366

Wang, Wen; He, Shitang; Li, Shunzhou; Liu, Minghua; Pan, Yong

2011-01-01

155

Minimizing the bulk-wave scattering loss in dual-mode SAW devices.  

PubMed

The losses arising from the scattering of SAW into bulk waves in the nonsynchronous areas of SAW devices are studied numerically using the boundary element method combined with the finite element method. As a reference structure, we use a typical one-port hiccup resonator on 42 degrees Y-LiTaO3. Strong scattering into bulk wave occurs in the central gap due to an abrupt change in periodicity. To reduce the scattering, we replace the gap with electrodes having reduced pitches. We show that it is possible to significantly increase the Q-factor of the resonator while keeping the resonant frequency unchanged. Two types of structures are studied: the "distributed" gap and the "accordion" gap. To minimize the bulk-wave scattering in dual-mode SAW filters, we replace the metallized gaps in the traditional filter with distributed gaps. We find an optimal combination of pitch and metallization ratio in the gaps, reducing the insertion loss by 0.3 dB. PMID:16471446

Wang, Weibiao; Zhang, Xiaodong; Shui, Yongan; Wu, Haodong; Zhang, De; Plessky, Victor P

2006-01-01

156

Cell detachment and label-free cell sorting using modulated surface acoustic waves (SAW) in droplet-based microfluidics  

E-print Network

We present a droplet-based surface acoustic wave (SAW) system designed to viably detach biological cells from a surface and sort cell types based on differences in adhesion strength (adhesion contrast), without the need to label cells with molecular markers. The system uses modulated SAW to generate pulsatile flows in the droplets and efficiently detach the cells, thereby minimizing SAW excitation power and exposure time. As a proof-of-principle, the system is shown to efficiently sort HEK 293 from A7r5 cells based on adhesion contrast. Results are obtained in minutes with sorting purity and efficiency reaching 97 % and 95 %, respectively.

Bussonnière, Adrien; Baudoin, Michael; Bou-Matar, Olivier; Grandbois, Michel; Charette, Paul; Renaudin, Alan

2014-01-01

157

Northern Saw-whet Owls (Aegolius acadicus) Captured at Cape May Point, NJ, 1980-1994: Comparison of Two Capture Techniques  

E-print Network

Northern Saw-whet Owls (Aegolius acadicus) Captured at Cape May Point, NJ, 1980-1994: Comparison 1980-1994, 1,270 Northern Saw-whet Owls (Aegolius acadicus) (NSWO) were captured and banded at Cape May peninsula funnels thousands of raptors each fall including numerous Northern Saw-whet Owls (Aegolius

158

INTERNATIONAL UNION OF OPERATING ENGINEERS NATIONAL HAZMAT PROGRAM - ADAMANT CIRCULAR SAW OENHP{number_sign}: 2001-05, VERSION A  

SciTech Connect

Florida International University's (FIU) Hemispheric Center for Environmental Technology (HCET) evaluated five saws for their effectiveness in cutting up specially prepared fiberglass-reinforced plywood crates. These crates were built as surrogates for crates that presently hold radioactive contaminated glove boxes at the Department of Energy's (DOE) Los Alamos facility. The Adamant circular saw was assessed on August 14, 2001. During the FIU test of efficacy, a team from the Operating Engineers National Hazmat Program (OENHP) evaluated the occupational safety and health issues associated with this technology. The Adamant was only used during a limited ''test'' on a regular plywood crate due to safety considerations of the tool for this application. The Adamant circular saw, a counter-rotating twin-cutter, constructed with blades that work differently than conventional cutting wheels with twin blades, each rotating in opposite directions. It is used to cut wood and metals. Each blade is approximately 8 3/4 inches in diameter with a maximum cutting depth of 2 1/2 inches. The machine has two rotation speeds: 1,900 and 2,900 rotations per minute (rpm). The saw is operated with an interlocked, guarded trigger switch located at the end of the saw opposite the cutting blades. To operate the saw, the safety interlock must be depressed prior to powering the saw with the trigger control. The saw is supported by a handle at the front of the saw near the cutting blades. The top part of the blades is guarded near the handle, with approximately three-fourths of the face of the blades exposed. The Adamant circular saw is an innovative technology used to cut metals and wood. Its safety features include: interlocking switch for powering the saw, overload indicator and shutoff, and an electronic brake that stops the engine immediately when the start button is released. The top part of the blades is guarded near the motor. With approximately three-fourths of the face of the blades open, the operator is exposed to the potential risk of serious and minor cuts and abrasions when using and handling the saw. There is also potential for damage to the blades if the saw is not stored properly. Without guarding on the lower part of the blades, these can be damaged if the saw is dropped or rested on the cutting blades. Based upon the industrial hygiene sampling conducted for the other four saws demonstrated at FIU, noise levels, nuisance dust, and airborne fiberglass may be a problem when using this technology for the cutting of fiberglass-reinforced plywood crates. No industrial hygiene sampling was conducted while the Adamant saw was in use. Engineering controls should be used to eliminate these problems whenever possible. Where this is not possible, administrative controls, training, and proper personal protective equipment (PPE) should be used. Respirators should be used if engineering controls do not sufficiently control the dust or fiberglass generated. Respirators should be equipped with an organic vapor and acid gas cartridge with High Efficiency Particulate Air (HEPA) filter, since during the demonstration, the workers complained of an odd smell, which may have been the breakdown of the fiberglass.

Unknown

2002-01-01

159

Chemically sensitive polymer-mediated nanoporous alumina SAW sensors for the detection of vapor-phase analytes  

E-print Network

sensitivity of conventional planar SAW devices. Attempts to directly impart selective gas-phase analyte permeation with monolayers of amine-terminated, poly(amidoamine) (PAMAM) dendrimer films were investigated with and without secondary functionalization...

Perez, Gregory Paul

2005-08-29

160

International Union of Operating Engineers National Hazmat Program. Porter-Cable Circular Saw OENHP Number: 2001-04, Version A.  

National Technical Information Service (NTIS)

Florida International University's (FIU) Hemispheric Center for Environmental Technology (HCET) evaluated five saws for their effectiveness in cutting specially prepared fiberglass-reinforced plywood crates. These crates were built as surrogates for crate...

2002-01-01

161

Population Densities of Northern Saw-whet Owls (Aegolius acadicus) in Degraded Boreal Forests of the Southern Appalachians  

Microsoft Academic Search

A disjunct population of the Northern Saw-whet Owl (Aegolius acadicus) breeds in the montane spruce-fir forests of the southern Appalachian Mountains. These forests are listed as the second most endangered ecosystem in the United States, having suffered from logging and massive fir die-off from the exotic balsam woolly adelgid. We used audio playbacks to compare densities of saw-whets prior to

Timothy C. Milling; Matthew P. Rowe; Bennie L. Cockerel; Timothy A. Dellinger; Johnny B. Gailes; Christopher E. Hill

162

Non-leaky, piezoelectric, quasi-shear-horizontal type SAW on X-cut LiTaO3  

Microsoft Academic Search

It is shown both theoretically and experimentally that, besides a conventional piezoelectric Rayleigh -type surface acoustic wave (R-SAW), there exists a nonleaky , piezoelectric, quasi-shear-horizontal-type surface acoustic wave (SH-SAW) on X-cut LiTaO3. Both of these waves are accompanied by all of the field components. This is very different from the situation on the substrate supporting a Bleustein-Gulyaev-Shimizu wave and a

Ken-ya Hashimoto; Masatsune Yamaguchi

1988-01-01

163

A layered SAW device based on ZnO\\/LiTaO3 for liquid media sensing applications  

Microsoft Academic Search

Surface Acoustic Wave (SAW) sensors comprising a zinc oxide guiding layer deposited on a 36°-YX lithium tantalate substrate were developed. They were found to have greater mass sensitivity than other LiTaO3 based SAW sensors, such as the -SiO2\\/LiTaO3 configuration. In this paper, the fabrication of the ZnO\\/LiTaO3 sensor is described and micro-characterisation of the deposited films is presented. Sensitivity of

David A. Powell; Kourosh Kalantar-zadeh; Samuel Ippolito; Wojtek Wlodarski

2002-01-01

164

Abrupt climate change, greenhouse gases, and the bipolar see-saw  

NSDL National Science Digital Library

In this activity, students work with paleoclimate proxy data (d18O, CH4, CO2)from the Byrd and GISP2 ice cores to investigate millennial-scale climate changes during the Last Glacial/Deglacial time periods. Students must prepare a publication quality plot of the data and answer several questions about the similarities and differences between the time-series (north-south phasing, amplitude, symmetry) and use this information to assess the bipolar see-saw mechanism for abrupt climate changes. Students are encouraged to read two journal articles for more information and to synthesize their results with other information from lectures and earlier readings.

Johnson, Kathleen

165

Effects of saw projection and seed roll density on the performance of a cottonseed linter  

E-print Network

EFFECTS OF SAW PROJECTION AND SEED ROLL DENSITY ON THE PERFORMANCE OF A COTTONSEED LINTER A Thesis By Charles G. Luedtke Submi 4t eel to the Braiiuat e School G f t il e Agricultural and Vechanical College of Texas in partial fulfillment... of the requirements for the degree of EASTER OF SCIENCE AUGUST lg56 IlaJ or; Mechanical Engineering L(BRARY A M C(ALLEGE OF TEXAS EFFECTS OF SAN PROJECTION AND SEED ROLL DENSITY ON THE PERFORMANCE OF A COTTONSEED LINTER A Thesis Hy Charles G. Luedtke...

Luedtke, Charles G

2012-06-07

166

Research on the h-BN films for high frequency SAW devices  

NASA Astrophysics Data System (ADS)

Hexagonal Boron Nitride (h-BN) films For high-frequency SAW devices were deposited on Ti/Al/Si(111) wafers by RF magnetron sputtering. The structure of h-BN films was investigated by fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) spectra. And the surface morphology and piezoelectric properties of h-BN film was characterized by atomic force microscopy (AFM). And the characterization results show that when the RF power is 300w and other experimental parameters were fixed, h-BN films was in high purity and the c-axis oriented, h-BN films was in high purity and the c-axis oriented, and the particles of which are uniform and compact, roughness is 2.63nm with piezoelectric and piezoelectric response even, meet the requirements of high sound propagation speed and excellent piezoelectric for high frequency SAW devices. The studies of piezoelectric test of thin films have shown that PFM test method of atomic force microscopy was suitable for characterization of piezoelectric and properties of the piezoelectric response distribution of nano-structure semiconductor thin film.

Sun, Lian-jie; Chen, Xi-ming

2011-11-01

167

Achievable Performance and Effective Interrogator Design for SAW RFID Sensor Tags  

NASA Technical Reports Server (NTRS)

For many NASA missions, remote sensing is a critical application that supports activities such as environmental monitoring, planetary science, structural shape and health monitoring, non-destructive evaluation, etc. The utility of the remote sensing devices themselves is greatly increased if they are passive V that is, they do not require any on-board power supply such as batteries V and if they can be identified uniquely during the sensor interrogation process. Additional passive sensor characteristics that enable greater utilization in space applications are small size and weight, long read ranges with low interrogator power, ruggedness, and operability in extreme environments (vacuum, extreme high/low temperature, high radiation, etc.) In this paper, we consider one very promising passive sensor technology, called surface acoustic wave (SAW) radio-frequency identification (RFID), that satisfies all of these criteria. In general, RFID is a method of identifying items using radio waves to interrogate tags encoded with a unique identifier that are affixed to the items of interest. In the case of passive tags, only the interrogator, which transmits power to the tags in the form of radio-frequency electromagnetic radiation, requires access to a power supply. Passive RFID technologies are used today in many applications, including asset tracking and management, security and access control, and remote sensing. To date, most of the development and application in RFID technology has focused on either asset/inventory tracking and control or security and access control because these are the largest commercial application areas. Recently however, there has been growing interest in using passive RFID technology for remote sensing applications, and SAW devices are at the forefront of RFID sensing technology development. Although SAW RFID tags have great potential for use in numerous space-based remote sensing applications, the limited collision resolution capability of current generation tags limits the performance in a cluttered sensing environment. That is, as more SAW-based sensors are added to the environment, numerous tag responses are superimposed at the receiver and decoding all or even a subset of the telemetry becomes increasingly difficult. Background clutter generated by reflectors other than the sensors themselves is also a problem, as is multipath interference and signal distortion, but the limiting factor in many remote sensing applications can be expected to be tag mutual interference. This problem may be greatly mitigated by proper design of the SAW tag waveform, but that remains an open research problem, and in the meantime, several other related questions remain to be answered including: (1) What are the fundamental relationships between tag parameters such as bit-rate, time-bandwidth-product, SNR, and achievable collision resolution? (2) What are the differences in optimal or near-optimal interrogator designs between noise-limited environments and interference-limited environments? (3) What are the performance characteristics of different interrogator designs in term of parameters such as transmitter power level, range, and number of interfering tags? In this paper, we will present the results of a research effort aimed at providing at least partial answers to all of these questions.

Barton Richard J.

2012-01-01

168

Effect of applied force and blade speed on histopathology of bone during resection by sagittal saw.  

PubMed

A sagittal saw is commonly used for resection of bone during joint replacement surgery. During sawing, heat is generated that can lead to an increase in temperature at the resected surface. The aim of this study was to determine the effect of applied thrust force and blade speed on generating heat. The effect of these factors and their interactions on cutting temperature and bone health were investigated with a full factorial Design of Experiments approach for two levels of thrust force, 15 N and 30 N, and for two levels of blade oscillation rate, 12,000 and 18,000 cycles per minute (cpm). In addition, a preliminary study was conducted to eliminate blade wear as a confounding factor. A custom sawing fixture was used to crosscut samples of fresh bovine cortical bone while temperature in the bone was measured by thermocouple (n=40), followed by measurements of the depth of thermal necrosis by histopathological analysis (n=200). An analysis of variance was used to determine the significance of the factor effects on necrotic depth as evidenced by empty lacunae. Both thrust force and blade speed demonstrated a statistically significant effect on the depth of osteonecrosis (p<0.05), while the interaction of thrust force with blade speed was not significant (p=0.22). The minimum necrotic depth observed was 0.50mm, corresponding to a higher level of force and blade speed (30 N, 18,000 cpm). Under these conditions, a maximum temperature of 93°C was measured at 0.3mm from the kerf. With a decrease in both thrust force and blade speed (15N, 12,000 cpm), the temperature in the bone increased to 109°C, corresponding to a nearly 50% increase in depth of the necrotic zone to 0.74 mm. A predictive equation for necrotic depth in terms of thrust force and blade speed was determined through regression analysis and validated by experiment. The histology results imply that an increase in applied thrust force is more effective in reducing the depth of thermal damage to surrounding bone than an increase in blade speed. PMID:24405736

James, Thomas P; Chang, Gerard; Micucci, Steven; Sagar, Amrit; Smith, Eric L; Cassidy, Charles

2014-03-01

169

Life threatening intracerebral haemorrhage following saw- scaled viper (Echis carinatus) envenoming-authenticated case report from Sri Lanka  

PubMed Central

Background Echis carinatus (Saw scaled viper {SSV}) is a venomous snake found in the parts of Middle East and Central Asia. SSV envenoming is characterized by local swelling and coagulopathy. Various bleeding manifestations are commonly seen with SSV envenoming. In contrast to other part of Asia, saw scale viper envenoming has not been reported to cause life threatening haemorrhagic manifestations in Sri Lanka. Case presentation We report a 19 years old healthy boy who developed massive left temporo-parietal intra cerebral haemorrhage following Echis carinatus (Saw scaled viper) bite in Sri Lanka. Conclusion Although subspecies of SSV in Sri Lanka is regarded as a ‘non lethal venomous snake’, the occurrence of rare potentially fatal complications such as intracerebral haemorrhage should be considered in their management. This case report is intended to bring the awareness of this fatal complication of SSV envenoming in Sri Lanka. PMID:23565979

2013-01-01

170

Comparison of the sensitive property between soman and its simulant DMMP by hydrogen-bond acidic polymer coated SAW sensor  

NASA Astrophysics Data System (ADS)

Hydrogen-bond acidic (HBA) polymers are widely used for the detection of dimethyl methyl phosphonate (DMMP, a simulant of real nerve agents) based on surface acoustic wave (SAW) sensors. This paper presented an HBA polymer PLF, and subsequently the polymer was dissolved into chloroform and spray-coated on a SAW device to fabricate a gas sensor. Then the sensor was equipped into a SAW test platform to investigate its sensitive property to soman vapor and its simulant DMMP at the concentrations below 20 mg/m3. Results revealed that the sensor showed high sensitivity to the analyte vapors, furthermore, the response of the sensor to soman vapor was relatively smaller and slower than that to DMMP. Tests to some common interference vapors were studied at the concentration of 10 mg/m3, and the results indicated that the sensor showed a good selective property.

Wang, Yang; Du, Xiaosong; Long, Yin; Jiang, Yadong

2014-08-01

171

Combining Brillouin spectroscopy and laser-SAW technique for elastic property characterization of thick DLC films.  

PubMed

Surface Brillouin spectroscopy (SBS) has been widely used for elastic property characterization of thin films. For films thicker than 500 nm, however, the wavelength of surface acoustic wave in the frequency range available for SBS is smaller than film thickness, and the SBS measures only the Rayleigh wave of the film. The laser-SAW technique, on the other hand, measures only the low-frequency portion of the surface acoustic wave dispersion and can estimate only one elastic modulus of the film (typically Young's modulus). In this work, we have combined the two methods to determine both Young's modulus and Poisson's ratio of a diamond-like carbon (DLC) film. It was found that reasonable estimates can be obtained for the longitudinal wave velocity, shear wave velocity, and Young's modulus of the film. The Poisson's ratio, however, still has a relatively large measurement error. PMID:15530982

Berezina, Sofia; Zinin, Pavel V; Schneider, Dieter; Fei, Dong; Rebinsky, Douglas A

2004-12-01

172

Shape-Selectivity with Liquid Crystal and Side-Chain Liquid Crystalline Polymer SAW Sensor Interfaces  

SciTech Connect

A liquid crystal (LC) and a side-chain liquid crystalline polymer (SCLCP) were tested as surface acoustic wave (SAW) vapor sensor coatings for discriminating between pairs of isomeric organic vapors. Both exhibit room temperature smectic mesophases. Temperature, electric-field, and pretreatment with self-assembled monolayers comprising either a methyl-terminated or carboxylic acid-terminated alkane thiol anchored to a gold layer in the delay path of the sensor were explored as means of affecting the alignment and selectivity of the LC and SCLCP films. Results for the LC were mixed, while those for the SCLCP showed a consistent preference for the more rod-like isomer of each isomer pair examined.

FRYE-MASON,GREGORY CHARLES; OBORNY,MICHAEL C.; PUGH,COLEEN; RICCO,ANTONIO; THOMAS,ROSS C.; ZELLERS,EDWARD T.; ZHANG,GUO-ZHENG

1999-09-23

173

Distraction osteogenesis for complex foot deformities: Gigli saw midfoot osteotomy with external fixation.  

PubMed

Open midfoot wedge osteotomy correction can cause neurovascular compromise, requires extensive exposure, sacrifices normal joints, and shortens the foot. We used a minimally invasive technique to treat complex foot deformities by combining percutaneous Gigli saw midfoot osteotomy, circular external fixation, and acute, gradual, or gradual with acute manipulation correction. The medical records of 23 patients (26 feet) with complex foot deformities (congenital, 18 feet; neuromuscular, 4 feet; post-traumatic, 3 feet; malunion, 1 foot) who had undergone treatment within an 18-year period (1990 through 2007) were retrospectively reviewed. We also performed the procedure on 10 cadaveric limbs to determine whether anatomic structures were at risk. Correction was achieved in all feet. The mean duration of external fixation treatment was 4.2 (range 3 to 7) months. The mean follow-up duration was 4.7 (range 2 to 18) years. A significant difference was observed in the pre- and postoperative, lateral view, talar-first metatarsal angle (p = .001). Minor complications (4 feet) consisted of bony exostoses. Major complications included recurrent deformity in 3 feet and sural nerve entrapment in 1 foot. Two patients had mild and one moderate foot pain. Three patients had impaired gait function; the remaining patients had functional gait. The mean interval until wearing regular shoes after external fixation removal was 2.3 (range 1 to 4) months. All but 1 of the patients were satisfied with the final results. We observed no cadaveric neurovascular injury. Our results have shown that percutaneous Gigli saw midfoot osteotomy can be performed without neurovascular injury and is capable of successfully correcting complex foot deformities. PMID:24891089

Lamm, Bradley M; Gourdine-Shaw, Monique C; Thabet, Ahmed M; Jindal, Gaurav; Herzenberg, John E; Burghardt, Rolf D

2014-01-01

174

Transverse waveguide mode suppression for Pt-electrode SAW resonators on quartz and LGS.  

PubMed

SAW resonators on ST-X quartz and langasite (LGS) [0°, 144°, 24°] are currently being used for hydrogen fluoride (HF) vapor sensing and high-temperature sensing, respectively. For these applications, the use of Pt-based electrodes allows the resonators to withstand the targeted harsh environments. This work reveals that for Pt-electrode resonators with conventional short-circuit gratings on the aforementioned quartz and LGS orientations, acoustic energy leaks from the grating region to the bus bars, thus degrading the resonator response. To resolve this problem, this paper proposes and implements open-circuit gratings for resonators fabricated with these substrate/metal combinations. The open-circuit gratings guide the acoustic energy within the grating region, resulting in greater quality factors and reduced losses in the resonator response. In addition, scalar potential theory is utilized in this work to identify transverse waveguide modes in the responses of open-circuit grating resonators on quartz and LGS. A transverse waveguide mode dispersion relation was derived to extend the scalar potential theory to account for asymmetry in the slowness curve around the propagation direction. This is the case for several commonly used LGS orientations, in particular LGS [0°, 144°, 24°]. Finally, this work addresses spurious transverse mode mitigation by scaling both the transducer's grating aperture and electrode overlap width. Open circuit grating resonators with appropriately scaled transducer designs were fabricated and tested, resulting in a 71% increase in quality factor and a spurious mode rejection of over 26 dBc for Pt-electrode devices on ST-X quartz. This progress directly translates into better frequency resolution and increased dynamic range for HF vapor sensors and high-temperature SAW devices. PMID:23443708

Meulendyk, Bennett J; Pereira da Cunha, Mauricio

2011-12-01

175

Combination of a SAW-biosensor with MALDI mass spectrometric analysis.  

PubMed

A S-sens K5 surface acoustic wave biosensor was coupled with mass spectrometry (SAW-MS) for the analysis of a protein complex consisting of human blood clotting cascade factor alpha-thrombin and human antithrombin III, a specific blood plasma inhibitor of thrombin. Specific binding of antithrombin III to thrombin was recorded as a function of time with a S-sens K5 biosensor. Two out of five elements of the sensor chip were used as references. To the remaining three elements coated with RNA anti-thrombin aptamers, thrombin and antithrombin III were bound consecutively. The biosensor measures mass changes on the chip surface showing that 20% of about 400fmol/cm2 thrombin formed a complex with the 1.7-times larger antithrombin III. Mass spectrometry (MS) was applied to identify the bound proteins. Sensor chips with aptamer-captured (1) thrombin and (2) thrombin-antithrombin III complex (TAT-complex) were digested with proteases on the sensor element and subsequently identified by peptide mass fingerprint (PMF) with matrix assisted laser desorption/ionization time-of-flight (MALDI-ToF) mass spectrometry. A significant identification of thrombin was achieved by measuring the entire digest with MALDI-ToF MS directly from the sensor chip surface. For the significant identification of both proteins in the TAT-complex, the proteolytic peptides had to be separated by nano-capillary-HPLC prior to MALDI-ToF MS. SAW-MS is applicable to protein interaction analysis as in functional proteomics and to miniaturized diagnostics. PMID:18316185

Treitz, G; Gronewold, T M A; Quandt, E; Zabe-Kühn, M

2008-05-15

176

Habitat Selection of Northern Saw-whet Owls (Aegolius acadicus brooksi) on the Queen Charlotte Islands, British Columbia  

E-print Network

Habitat Selection of Northern Saw-whet Owls (Aegolius acadicus brooksi) on the Queen Charlotte of the Queen Charlotte Islands, British Columbia is recognized as a distinct subspecies, Aegolius acadicus Columbia is recog- nized as a distinct subspecies, Aegolius acadicus brooksi (Fleming). Little is known

177

Survey of Blood Parasites in Two Forest Owls, Northern Saw-whet Owls and Flammulated Owls, of Western North America  

Microsoft Academic Search

Except for a few studies in the eastern United States, little has been published on hemoparasites in owls. We surveyed the blood parasites of 108 Northern Saw-whet Owls (Aegolius acadicus) and 24 Flammulated Owls (Otus flammeolus) in Idaho during autumn migration in 1999 and 2000. We also surveyed 15 Flammulated Owls (FLOW) during breeding season in Utah from 2000. Leucocytozoon

Lynda L. Leppert; Alfred M. Dufty; Sarah Stock; M. David Oleyar; Greg S. Kaltenecker

178

MONITORING HABITAT QUALITY AND CONDITION OF QUEEN CHARLOTTE SAW-WHET OWLS (AEGOLIUS ACADICUS BROOKSI) USING VOCAL INDIVIDUALITY  

Microsoft Academic Search

ABSTRACT Many of the traditional methods of monitoring individual study subjects becomeincreasingly challenging when dealing with cryptic, nocturnal or secretive species. By exploiting the highly vocal nature of northern saw-whet owls, I sought to test two vocally based monitoring methods on the subspecies endemic to the Queen Charlotte Islands, Aegolius acadicus brooksi. First, by using discriminant function analysis, I explored

Carmen I. Holschuh

2004-01-01

179

The 2.2 Ghz Surface Acoustic Wave (SAW) Oscillator Development Ku-Band Frequency Source Development.  

National Technical Information Service (NTIS)

Two 2.2 GHz SAW oscillators using aluminum nitride on sapphire (AlN/Al2O3) delay lines were fabricated. The oscillators were electronically temperature compensated and characterized. One of the oscillators was used as the frequency reference for the Ku ba...

1979-01-01

180

Role of Saw1 in Rad1/Rad10 complex assembly at recombination intermediates in budding yeast  

PubMed Central

The Saccharomyces cerevisiae Rad1/Rad10 complex is a multifunctional, structure-specific endonuclease that processes UV-induced DNA lesions, recombination intermediates, and inter-strand DNA crosslinks. However, we do not know how Rad1/Rad10 recognizes these structurally distinct target molecules or how it is incorporated into the protein complexes capable of incising divergent substrates. Here, we have determined the order and hierarchy of assembly of the Rad1/Rad10 complex, Saw1, Slx4, and Msh2/Msh3 complex at a 3? tailed recombination intermediate. We found that Saw1 is a structure-specific DNA binding protein with high affinity for splayed arm and 3?-flap DNAs. By physical interaction, Saw1 facilitates targeting of Rad1 at 3? tailed substrates in vivo and in vitro, and enhances 3? tail cleavage by Rad1/Rad10 in a purified system in vitro. Our results allow us to formulate a model of Rad1/Rad10/Saw1 nuclease complex assembly and 3? tail removal in recombination. PMID:23299942

Li, Fuyang; Dong, Junachao; Eichmiller, Robin; Holland, Cory; Minca, Eugen; Prakash, Rohit; Sung, Patrick; Yong Shim, Eun; Surtees, Jennifer A; Eun Lee, Sang

2013-01-01

181

Aaron Martin: I saw the movie in the 48 frames per second format. This apparently makes the  

E-print Network

Aaron Martin: I saw the movie in the 48 frames per second format. This apparently makes the film, taking away some of the magic and lore of a sci- fi film. As for the movie itself, I thought it came across as in the movie. Peter Jackson was almost too true to the story. As an adult watching

Chapman, Michael S.

182

Acoustoelectric Effect on the Responses of SAW Sensors Coated with Electrospun ZnO Nanostructured Thin Film  

PubMed Central

In this study, zinc oxide (ZnO) was a very good candidate for improving the sensitivity of gas sensor technology. The preparation of an electrospun ZnO nanostructured thin film on a 433 MHz Rayleigh wave based Surface Acoustic Wave (SAW) sensor and the investigation of the acoustoelectric effect on the responses of the SAW sensor are reported. We prepared an electrospun ZnO nanostructured thin film on the SAW devices by using an electrospray technique. To investigate the dependency of the sensor response on the structure and the number of the ZnO nanoparticles, SAW sensors were prepared with different coating loads. The coating frequency shifts were adjusted to fall between 100 kHz and 2.4 MHz. The sensor measurements were performed against VOCs such as acetone, trichloroethylene, chloroform, ethanol, n-propanol and methanol vapor. The sensor responses of n-propanol have opposite characteristics to the other VOCs, and we attributed these characteristics to the elastic effect/acoustoelectric effect.

Tasaltin, Cihat; Ebeoglu, Mehmet Ali; Ozturk, Zafer Ziya

2012-01-01

183

Low Noise Synthesized Microwave Local Oscillator for High Capacity Digital Radio Systems using a Dielectric Resonator and a SAW Reference  

Microsoft Academic Search

A novel solution for a synthesized microwave local oscillator suitable for high capacity digital radio systems using multilevel QAM is described. The synthesizer approach covering all radio channels of a given RF band is based on a mechanically and electronically tunable dielectric resonator oscillator phase locked with a wideband PLL to a low noise UHF SAW reference oscillator. Based on

K. Borst; N. Loechel; K. Wacker

1989-01-01

184

Comparison of Food Habits of the Northern Saw-whet Owl (Aegolius acadicus) and the Western Screech-owl (Otus kennicottii) in Southwestern Idaho  

E-print Network

Comparison of Food Habits of the Northern Saw-whet Owl (Aegolius acadicus) and the Western Screech-season diets of Northern Saw- whet Owls (Aegolius acadicus) and Western Screech-owls (Otus kennicottii). Prey (Aegolius acadicus) and Western Screech-owls (Otus kennicottii) inhabit many different habitat types

185

Neutrino Masses at LHC: Minimal Lepton Flavour Violation in Type-III See-saw  

E-print Network

We study the signatures of minimal lepton flavour violation in a simple Type-III see--saw model in which the flavour scale is given by the new fermion triplet mass and it can be naturally light enough to be produced at the LHC. In this model the flavour structure of the couplings of the triplet fermions to the Standard Model leptons can be reconstructed from the neutrino mass matrix and the smallness of the neutrino mass is associated with a tiny violation of total lepton number. Characteristic signatures of this model include suppressed lepton number violation decays of the triplet fermions, absence of displaced vertices in their decays and predictable lepton flavour composition of the states produced in their decays. We study the observability of these signals in the processes $pp\\rightarrow 3\\ell + 2j +\\Sla{E_T}$ and $pp\\rightarrow 2\\ell + 4j$ with $\\ell =e$ or $\\mu$ taking into account the present low energy data on neutrino physics and the corresponding Standard Model backgrounds. Our results indicate th...

Eboli, O J P; Gonzalez-Garcia, M C

2011-01-01

186

Neutrino Masses at LHC: Minimal Lepton Flavour Violation in Type-III See-saw  

E-print Network

We study the signatures of minimal lepton flavour violation in a simple Type-III see - saw model in which the flavour scale is given by the new fermion triplet mass and it can be naturally light enough to be produced at the LHC. In this model the flavour structure of the lepton number conserving couplings of the triplet fermions to the Standard Model leptons can be reconstructed from the neutrino mass matrix and the smallness of the neutrino mass is associated with a tiny violation of total lepton number. Characteristic signatures of this model include suppressed lepton number violation decays of the triplet fermions, absence of displaced vertices in their decays and predictable lepton flavour composition of the states produced in their decays. We study the observability of these signals in the processes $pp\\rightarrow 3\\ell + 2j +\\Sla{E_T}$ and $pp\\rightarrow 2\\ell + 4j$ with $\\ell =e$ or $\\mu$ taking into account the present low energy data on neutrino physics and the corresponding Standard Model backgrounds. Our results indicate that the new fermionic states can be observed for masses up to 500 GeV depending on the CP violating Majorana phase for an integrated luminosity of 30 fb$^{-1}$. Moreover, the flavour of the final state leptons in the above processes can shed light on the neutrino mass ordering.

O. J. P. Eboli; J. Gonzalez-Fraile; M. C. Gonzalez-Garcia

2011-08-02

187

Effect of diamond nucleation process on propagation losses of AlN/diamond SAW filter.  

PubMed

In this work, the effect of a diamond nucleation process on freestanding aluminium nitride (AlN)/diamond surface acoustic wave (SAW) device performances was studied. Before diamond deposition, silicon (Si) substrates have been mechanically nucleated, using an ultrasonic vibration table with submicron diamond slurry, and bias-enhanced nucleated (BEN). Freestanding diamond layers obtained on mechanically scratched Si substrates exhibit a surface roughness of R(MS) = 13 nm, whereas very low surface roughness (as low as R(MS) < or = 1 nm) can be achieved on a freestanding BEN diamond layer. Propagation losses have been measured as a function of the operating frequency for the two nucleation techniques. Dispersion curves of phase velocities and electromechanical coupling coefficient (K2) were determined experimentally and by calculation as a function of normalized thickness AlN film (kh(AlN) = 2pi h(AlN)/lambda). Experimental results show that the propagation losses strongly depend on the nucleation technique, and that these losses are weakly increased with frequency when the BEN technique is used. PMID:15690731

Elmazria, Omar; El Hakiki, Mohamed; Mortet, Vincent; Assouar, Badreddine M; Nesládek, Milos; Vanecek, Milan; Bergonzo, Philippe; Alnot, Patrick

2004-12-01

188

Comparison of Dust Release from Epoxy and Paint Nanocomposites and Conventional Products during Sanding and Sawing.  

PubMed

The release of dust generated during sanding or sawing of nanocomposites was compared with conventional products without nanomaterials. Epoxy-based polymers with and without carbon nanotubes, and paints with different amounts of nano-sized titanium dioxide, were machined in a closed aerosol chamber. The temporal evolution of the aerosol concentration and size distribution were measured simultaneously. The morphology of collected dust by scanning electron microscopy was different depending on the type of nanocomposites: particles from carbon nanotubes (CNTs) nanocomposites had protrusions on their surfaces and aggregates and agglomerates are attached to the paint matrix in particles emitted from alkyd paints. We observed no significant differences in the particle size distributions when comparing sanding dust from nanofiller containing products with dust from conventional products. Neither did we observe release of free nanomaterials. Instead, the nanomaterials were enclosed or partly enclosed in the matrix. A source strength term Si (cm(-3) s(-1)) that describes particle emission rates from continuous sources was introduced. Comparison between the Si parameters derived from sanding different materials allows identification of potential effects of addition of engineered nanoparticles to a composite. PMID:25030708

Gomez, Virginia; Levin, Marcus; Saber, Anne T; Irusta, Silvia; Dal Maso, Miikka; Hanoi, Roberto; Santamaria, Jesus; Jensen, Keld A; Wallin, Håkan; Koponen, Ismo K

2014-10-01

189

Characterizing components of the Saw Palmetto Berry Extract (SPBE) on prostate cancer cell growth and traction  

SciTech Connect

Saw Palmetto Berry Extract (SPBE) is applied for prostate health and treatment of urinary tract infections, nonbacterial prostitis and Benign Prostatic Hyperplasia (BPH) in man. An assumption is that SPBE affects tumor cell progression and migration in breast and prostate tissue. In this work, DU-145 cells were used to demonstrate that SPBE and its sterol components, {beta}-sitosterol and stigmasterol, inhibit prostate cancer growth by increasing p53 protein expression and also inhibit carcinoma development by decreasing p21 and p27 protein expression. In the presence of cholesterol, these features are not only reversed but increased significantly. The results show for the first time the potential of SPBE, {beta}-sitosterol and stigmasterol as potential anti-tumor agents. Since the protein p53 is also regarded as nuclear matrix protein facilitating actin cytoskeletal binding, 2D tractions were measured. The cell adhesion strength in the presence of SPBE, {beta}-sitosterol and cholesterol and the observation was that the increase in p53 expression triggered an increase in the intracellular force generation. The results suggest a dual function of p53 in cells.

Scholtysek, Carina; Krukiewicz, Aleksandra A. [Center for Medical Physics and Technology, Biophysics Group, Friedrich-Alexander-University of Erlangen-Nuremberg, Henke Str. 91, Erlangen 91052 (Germany); Alonso, Jose-Luis [Massachusetts General Hospital/Harvard Medical School, Charlestown, MA 02129 (United States); Sharma, Karan P.; Sharma, Pal C. [Boston BioProducts, Inc., Worcester, MA 01604 (United States); Goldmann, Wolfgang H. [Center for Medical Physics and Technology, Biophysics Group, Friedrich-Alexander-University of Erlangen-Nuremberg, Henke Str. 91, Erlangen 91052 (Germany)], E-mail: wgoldmann@biomed.uni-erlangen.de

2009-02-13

190

Application of convolve-multiply-convolve SAW processor for satellite communications  

NASA Technical Reports Server (NTRS)

There is a need for a satellite communications receiver than can perform simultaneous multi-channel processing of single channel per carrier (SCPC) signals originating from various small (mobile or fixed) earth stations. The number of ground users can be as many as 1000. Conventional techniques of simultaneously processing these signals is by employing as many RF-bandpass filters as the number of channels. Consequently, such an approach would result in a bulky receiver, which becomes impractical for satellite applications. A unique approach utilizing a realtime surface acoustic wave (SAW) chirp transform processor is presented. The application of a Convolve-Multiply-Convolve (CMC) chirp transform processor is described. The CMC processor transforms each input channel into a unique timeslot, while preserving its modulation content (in this case QPSK). Subsequently, each channel is individually demodulated without the need of input channel filters. Circuit complexity is significantly reduced, because the output frequency of the CMC processor is common for all input channel frequencies. The results of theoretical analysis and experimental results are in good agreement.

Lie, Y. S.; Ching, M.

1991-01-01

191

Saw-tooth refractive lens for high energy x-ray focusing  

NASA Astrophysics Data System (ADS)

Saw-tooth refractive lens (SRL) provides a comparatively attractive option for X-ray focusing. An SRL assembly consists of two parts, each with an array of triangular structures (prisms), set tilted symmetrically with respect to the incoming beam. Its main advantage is a simple, continuous tunability in energy and focal length. SRLs can be used for both long and short focal length focusing. Long focal distance focusing of an SRL can accurately be predicted using simple analytical relations. However, the focus size at short focal distances focusing may deviate appreciably from the expected demagnified source size when: (1) the length of the SRL is comparable with the focusing distance, (2) the incident beam is not monochromatic, and (3) and the distance between adjacent prism tips, the tip step, is large . The first factor was considered in a previous work while the other two are addressed is this paper. This preliminary work is aimed at a better understanding of the SRL lenses for focusing an undulator beamline at the Advanced Photon Source (APS).

Antimonov, Mikhail A.; Khounsary, Ali M.

2014-09-01

192

Precise design technique for a SAW-resonator-coupled filter on 36° YX-LiTaO3 for use in a GSM SAW duplexer module for satisfying all GSM system specifications  

Microsoft Academic Search

A miniature low-loss high-performance surface acoustic wave (SAW) duplexer module consisting of a receiver top filter (R1), transmitter final stage filter (T1), lumped matching-circuit elements and lumped phase-shift circuits has been developed, and its use in the Global System for Mobile Communication (GSM) is described as a design example. The complete duplexer module has an insertion loss of less than

N. Shibagaki; K. Sakiyama; M. Hikita

1996-01-01

193

Survey of blood parasites in two forest owls, Northern Saw-whet Owls and Flammulated Owls, of western North America.  

PubMed

Except for a few studies in the eastern United States, little has been published on hemoparasites in owls. We surveyed the blood parasites of 108 Northern Saw-whet Owls (Aegolius acadicus) and 24 Flammulated Owls (Otus flammeolus) in Idaho during autumn migration in 1999 and 2000. We also surveyed 15 Flammulated Owls (FLOW) during breeding season in Utah from 2000. Leucocytozoon ziemanni, Haemoproteus syrnii, Haemoproteus noctuae, and Trypanosoma avium were identified. The overall prevalence of infection was 53% (78/147) and for the combined species, prevalences of Haemoproteus, Leucocytozoon, and Trypanosoma species were 20%, 39%, and 4%, respectively. Northern Saw-whet Owls (NSWO) had an overall prevalence of 51% (55/108), with prevalences of 6%, 47%, and 4% by hemoparasite genus, respectively. Flammulated Owls had an overall prevalence of 59% (23/39), with prevalences of 56%, 18%, and 5% by genus, respectively. This study provides baseline hematozoa information for two boreal owl species. PMID:18436683

Leppert, Lynda L; Dufty, Alfred M; Stock, Sarah; Oleyar, M David; Kaltenecker, Greg S

2008-04-01

194

A forest without trees: Development of high-surface-area materials for enhanced-sensitivity SAW arrays  

SciTech Connect

Chemical sensor arrays are an alternative to the tedious development of highly specific single-analyte detectors. Recent efforts have focused on the chemical and physical diversity of interface materials for SAW sensor arrays. However, the issues of wide dynamic range and high sensitivity must also be addressed for sensor arrays to compete in applications requiring low detection limits. Because SAW devices respond in proportion to change in mass per nominal unit area of the device surface, sensitivity is enhanced by surface modification with high-area, thin-film coating materials: a greater mass of analyte is adsorbed at a given ambient concentration. The authors are exploring several classes of electrochemically prepared high-area films, materials whose formulations and processing are well documented for applications other than chemical sensors. They present results from films formed by anodization, chemical conversion, and electroplating, yielding surface area enhancements as high as 170x.

Yelton, W.G.; Ricco, A.J.; Staton, A.W.

1998-08-01

195

Dual SAW sensor technique for determining mass and modulus changes in thin silicate films during gas adsorption  

SciTech Connect

Surface acoustic wave (SAW) sensors, which are sensitive to a variety of surface changes, have been widely used for chemical and physical sensing. The ability to control or compensate for the many surface forces has been instrumental in collecting valid data. In cases where it is not possible to neglect certain effects, such as frequency drift with temperature, methods such as the dual sensor technique have been utilized. This paper describes a novel use of a dual sensor technique, using two sensor materials, Quartz and GaAs, to separate out the contributions of mass and modulus of the frequency change during gas adsorption experiments. The large modulus change in the film calculated using this technique, and predicted by the Gassmann equation, provide a greater understanding of the challenges of SAW sensing.

Hietala, S.L.; Hietala, V.M.; Brinker, C.J.

2000-01-10

196

Material property evaluations of bimetallic welds, stainless steel saw fusion lines, and materials affected by dynamic strain aging  

SciTech Connect

Pipe fracture analyses can often reasonably predict the behavior of flawed piping. However, there are material applications with uncertainties in fracture behavior. This paper summarizes work on three such cases. First, the fracture behavior of bimetallic welds are discussed. The purpose of the study was to determine if current fracture analyses can predict the response of pipe with flaws in bimetallic welds. The weld joined sections of A516 Grade 70 carbon steel to F316 stainless steel. The crack was along the carbon steel base metal to Inconel 182 weld metal fusion line. Material properties from tensile and C(T) specimens were used to predict large pipe response. The major conclusion from the work is that fracture behavior of the weld could be evaluated with reasonable accuracy using properties of the carbon steel pipe and conventional J-estimation analyses. However, results may not be generally true for all bimetallic welds. Second, the toughness of austenitic steel submerged-arc weld (SAW) fusion lines is discussed. During large-scale pipe tests with flaws in the center of the SAW, the crack tended to grow into the fusion line. The fracture toughness of the base metal, the SAW, and the fusion line were determined and compared. The major conclusion reached is that although the fusion line had a higher initiation toughness than the weld metal, the fusion-line J-R curve reached a steady-state value while the SAW J-R curve increased. Last, carbon steel fracture experiments containing circumferential flaws with periods of unstable crack jumps during steady ductile tearing are discussed. These instabilities are believed to be due to dynamic strain aging (DSA). The paper discusses DSA, a screening criteria developed to predict DSA, and the ability of the current J-based methodologies to assess the effect of these crack instabilities. The effect of loading rate on the strength and toughness of several different carbon steel pipes at LWR temperatures is also discussed.

Rudland, D.; Scott, P.; Marschall, C.; Wilkowski, G. [Battelle Memorial Institute, Columbus, OH (United States)

1997-04-01

197

Detection, Identification, Location, and Remote Sensing using SAW RFID Sensor Tags  

NASA Technical Reports Server (NTRS)

In this presentation, we will consider the problem of simultaneous detection, identification, location estimation, and remote sensing for multiple objects. In particular, we will describe the design and testing of a wireless system capable of simultaneously detecting the presence of multiple objects, identifying each object, and acquiring both a low-resolution estimate of location and a high-resolution estimate of temperature for each object based on wireless interrogation of passive surface acoustic wave (SAW) radiofrequency identification (RFID) sensor tags affixed to each object. The system is being studied for application on the lunar surface as well as for terrestrial remote sensing applications such as pre-launch monitoring and testing of spacecraft on the launch pad and monitoring of test facilities. The system utilizes a digitally beam-formed planar receiving antenna array to extend range and provide direction-of-arrival information coupled with an approximate maximum-likelihood signal processing algorithm to provide near-optimal estimation of both range and temperature. The system is capable of forming a large number of beams within the field of view and resolving the information from several tags within each beam. The combination of both spatial and waveform discrimination provides the capability to track and monitor telemetry from a large number of objects appearing simultaneously within the field of view of the receiving array. In the presentation, we will summarize the system design and illustrate several aspects of the operational characteristics and signal structure. We will examine the theoretical performance characteristics of the system and compare the theoretical results with results obtained from experiments in both controlled laboratory environments and in the field.

Barton, Richard J.

2009-01-01

198

Structural Loading on the QCM/SAW Instrument Aboard the ER-2 Used for Atmospheric Testing  

NASA Technical Reports Server (NTRS)

Several experiments have been proposed to capture and evaluate samples of the atmosphere where SST's travel. One means to achieve this is to utilize the quartz crystal microbalance (QCM) / surface acoustical wave (SAW) instrument installed aboard the ER-2, formerly the U-2 reconnaissance aircraft. The QCM is a cascade impactor designed to perform in-situ, real-time measurements of aerosols and chemical vapors at an altitude of 60,000-70,000 feet. The primary use of the ER-2 is by NASA for Earth resources to test new sensor systems before being placed aboard satellites. One of the main reasons the ER-2 is used for this flight experiment is its capability to fly approximately twelve miles above the sea level (can reach an altitude of 78,000 feet). Because the ER-2 operates at such a high altitude, it is of special interest to scientists interested in space exploration or supersonic aircraft. The purpose of some of the experiments is to extinct data from the atmosphere around the ER-2. For the current CSTEA flight experiment, the housing of the QCM is in a frame that connects to an outer pod that attaches to the fuselage of the ER-2. Due to the location of the QCM within the housing frame and the location of the pod on the ER-2, the pod and its contents are subject to structural loads. In addition to structural loads, structural vibrations are also of importance because the QCM output data is based on the determination of beat frequencies between a pair of oscillators (one coated, the second uncoated, according to the chemical reaction being monitored). A structural analysis of this system can indicate whether potential resonances may exist between the (higher) structural modal frequencies and the beat frequencies. In addition undesirable deformations may result due to maximum expected static or dynamic loads during typical flight conditions. If the deformations are excessive they may adversely affect the accuracy the instrumentation output.

Bainum, Peter M.; Jones, Phyllis D.; Irish, Sandra M.; Xing, Guang-Qian

1998-01-01

199

Effects of film morphology on the frequency and attenuation of a polymer-coated SAW device exposed to organic vapor  

SciTech Connect

Surface acoustic wave devices are under increasing development for a variety of analytical applications, including chemical sensing and the characterization of thin films. The frequency and attenuation of PIB polymer-coated SAW devices were monitored during exposure to isooctane vapor as the coating thickness on the SAW was varied incrementally up to film thicknesses of about 300 kHz. Airbrush-coated devices exhibited significantly different response behavior compared to drop evaporation coated devices, most notably in attenuation of the acoustic wave. The drop evaporated films exhibited periodic, large attenuation with concurrent decreases in observed frequency shifts. These results are consistent with the film resonance model of Martin and Frye. In this work, the author demonstrates how this model can also be used to estimate the shear modulus of polymer films exposed to vapors. For the PIB films used in this work exposed to isooctane vapor the resonance thickness is calculated to be 0.0082 [mu]m (before swelling), with a calculated modulus of 2.7 [times] 10[sup 5] dynes/cm[sup 2]. This represents a significant decrease in modulus compared to a neat PIB film (not exposed to vapor) and supports recent reports on the importance of polymer swelling in SAW responses. 6 refs., 5, figs., 2 tabs.

Ballantine, D.S. Jr. (Northern Illinois Univ., DeKalb (United States))

1992-12-15

200

Cultivation of different strains of king oyster mushroom (Pleurotus eryngii) on saw dust and rice straw in Bangladesh.  

PubMed

Pleurotus eryngii is a popular mushroom due to its excellent consistency of cap and stem, culinary qualities and longer shelf life. In Bangladesh, where Pleurotus mushrooms are very popular, P. eryngii may take position among the consumers, but currently this mushroom is not cultivated in large scale there. In this study, 3 strains of P. eryngii such as Pe-1 (native to Bangladesh), Pe-2 (germplasm collected from China) and Pe-3 (germplasm collected from Japan) were cultivated on saw dust and rice straw and their growth and yield parameters were investigated. Pe-1 on saw dust showed the highest biological yield and efficiency (73.5%) than other strains. Also, the mycelium run rate and number of fruiting bodies were higher in Pe-1 than other two strains. The quality of mushroom strains was near about similar. On saw dust, the yield and efficiency were better than those cultivated on rice straw, however, on straw; the mushroom fruiting bodies were larger in size. This study shows the prospects of P. eryngii cultivation in Bangladesh and suggests further study in controlled environment for higher yield and production. PMID:23961095

Moonmoon, Mahbuba; Uddin, Md Nazim; Ahmed, Saleh; Shelly, Nasrat Jahan; Khan, Md Asaduzzaman

2010-10-01

201

Cultivation of different strains of king oyster mushroom (Pleurotus eryngii) on saw dust and rice straw in Bangladesh  

PubMed Central

Pleurotus eryngii is a popular mushroom due to its excellent consistency of cap and stem, culinary qualities and longer shelf life. In Bangladesh, where Pleurotus mushrooms are very popular, P. eryngii may take position among the consumers, but currently this mushroom is not cultivated in large scale there. In this study, 3 strains of P. eryngii such as Pe-1 (native to Bangladesh), Pe-2 (germplasm collected from China) and Pe-3 (germplasm collected from Japan) were cultivated on saw dust and rice straw and their growth and yield parameters were investigated. Pe-1 on saw dust showed the highest biological yield and efficiency (73.5%) than other strains. Also, the mycelium run rate and number of fruiting bodies were higher in Pe-1 than other two strains. The quality of mushroom strains was near about similar. On saw dust, the yield and efficiency were better than those cultivated on rice straw, however, on straw; the mushroom fruiting bodies were larger in size. This study shows the prospects of P. eryngii cultivation in Bangladesh and suggests further study in controlled environment for higher yield and production. PMID:23961095

Moonmoon, Mahbuba; Uddin, Md. Nazim; Ahmed, Saleh; Shelly, Nasrat Jahan; Khan, Md. Asaduzzaman

2010-01-01

202

INTERNATIONAL UNION OF OPERATING ENGINEERS NATIONAL HAZMAT PROGRAM - DEWALT RECIPROCATING SAW OENHP{number_sign}: 2001-01, VERSION A  

SciTech Connect

Florida International University's (FIU) Hemispheric Center for Environmental Technology (HCET) evaluated five saws for their effectiveness in cutting specially prepared fiberglass-reinforced plywood crates. These crates were built as surrogates for crates that presently hold radioactively contaminated glove boxes at the Department of Energy's (DOE) Los Alamos facility. The DeWalt reciprocating saw was assessed on August 13, 2001. During the FIU test of efficacy, a team from the Operating Engineers National Hazmat Program (OENHP) evaluated the occupational safety and health issues associated with this technology. The DeWalt reciprocating saw is a hand-held industrial tool used for cutting numerous materials, including wood and various types of metals depending upon the chosen blade. Its design allows for cutting close to floors, corners, and other difficult areas. An adjustable shoe sets the cut at three separate depths. During the demonstration for the dismantling of the fiberglass-reinforced plywood crate, the saw was used for extended continuous cutting, over a period of approximately two hours. The dismantling operation involved vertical and horizontal cuts, saw blade changes, and material handling. During this process, operators experienced vibration to the hand and arm in addition to a temperature rise on the handgrip. The blade of the saw is partially exposed during handling and fully exposed during blade changes. Administrative controls, such as duty time of the operators and the machine, operator training, and personal protective equipment (PPE), such as gloves, should be considered when using the saw in this application. Personal noise sampling indicated that both workers were exposed to noise levels exceeding the Occupational Safety and Health Administration's (OSHA) Action Level of 85 decibels (dBA) with time-weighted averages (TWA's) of 88.3 and 90.6 dBA. Normally, a worker would be placed in a hearing conservation program if his TWA was greater than the Action Level. In this case, however, monitoring was conducted during a simulation, not during the actual work conducted at the worksite. Additional sampling should be conducted at the worksite to determine the actual noise levels for the workers. Until it is determined that the actual TWA's are less than the Action Level, the workers should use PPE. A training program on the proper use and wearing of the selected PPE should be provided to each worker. Nuisance dust monitoring yielded a concentration of 10.69 milligrams per cubic meter (mg/m{sup 3}). Although this is less than the OSHA Permissible Exposure Limit (PEL) of 15 mg/m{sup 3}, it is above the American Conference of Governmental Industrial Hygienists' (ACGIH) Threshold Limit Value (TLV) of 10 mg/m{sup 3}. Fiberglass dust monitoring yielded a fiber count of 1.7 fibers per cubic centimeter (f/cc). This is above the PEL and the TLV of 1.0 f/cc. Therefore, controls should be implemented (engineering or PPE) to reduce the workers' exposure to the dust. Respirators should be used if engineering controls do not sufficiently control the dust or fiberglass generated. Respirators should be equipped with an organic vapor and acid gas cartridge with a High Efficiency Particulate Air (HEPA) filter, since during the demonstration, the workers complained of an odd smell, which may have been from the breakdown of the fiberglass.

Unknown

2002-01-31

203

Investigating Raptor Migration Behavior Using Orientation Cages and Wing Measurements: A Comparison of the Flammulated Owl and Northern Saw-whet Owl in Southwestern Idaho.  

E-print Network

??Flammulated Owls (Otus flammeolus) are long-distance migrants, while Northern Saw-whet Owls (Aegolius acadicus) exhibit more variable migration tendencies. I investigated the migratory behavior of these… (more)

Smith, Rhonda F.

2009-01-01

204

that could be `cured' by lifelong oestrogen replacement. The first period saw older women through societies' `maternalist ideology'. Women were mothers, and when their reproductive  

E-print Network

that could be `cured' by lifelong oestrogen replacement. The first period saw older women through for exacerbating it. Physicians assumed that women brought on their own surges of emotionality, depression

Merchant, Carolyn

205

A laser probing system for characterization of SAW propagation on LiNbO3, LiTaO3, and quartz  

Microsoft Academic Search

A nondestructive high-resolution technique for the optical detection of the phase and amplitude of high-frequency surface acoustic wave (SAW) devices is presented. The setup incorporates a mode-locked ps-laser, harmonic mixing, and coherent detection. Dynamic range and minimum detectable surface displacement were 50 dB and 1 pm\\/?(Hz), respectively. The probing technique allows not only the measurement of the SAW field but

A. Holm; R. Weigel; P. Russer; W. Ruile

1996-01-01

206

Temperature compensated LiTaO3\\/sapphire bonded SAW substrate with low loss and high coupling factor suitable for US-PCS application  

Microsoft Academic Search

A novel temperature-compensated SAW substrate was developed based on bonded LiTaO3\\/sapphire. Because of its small TEC (thermal expansion coefficient) and large Young's modulus, sapphire is an ideal material for a support substrate. The frequency and temperature characteristics of the bonded LiTaO3\\/sapphire SAW substrate and its application to a US-PCS duplexer are described.

M. Miura; T. Matsuda; Y. Satoh; M. Ueda; O. Ikata; Y. Ebata; H. Takagi

2004-01-01

207

A SAW-based chemical sensor for detecting sulfur-containing organophosphorus compounds using a two-step self-assembly and molecular imprinting technology.  

PubMed

This paper presents a new effective approach for the sensitive film deposition of surface acoustic wave (SAW) chemical sensors for detecting organophosphorus compounds such as O-ethyl-S-2-diisopropylaminoethyl methylphosphonothiolate (VX) containing sulfur at extremely low concentrations. To improve the adsorptive efficiency, a two-step technology is proposed for the sensitive film preparation on the SAW delay line utilizing gold electrodes. First, mono[6-deoxy-6-[(mercaptodecamethylene)thio

Pan, Yong; Yang, Liu; Mu, Ning; Shao, Shengyu; Wang, Wen; Xie, Xiao; He, Shitang

2014-01-01

208

Laboratory evaluation to reduce respirable crystalline silica dust when cutting concrete roofing tiles using a masonry saw.  

PubMed

Respirable crystalline silica dust exposure in residential roofers is a recognized hazard resulting from cutting concrete roofing tiles. Roofers cutting tiles using masonry saws can be exposed to high concentrations of respirable dust. Silica exposures remain a serious threat for nearly two million U.S. construction workers. Although it is well established that respiratory diseases associated with exposure to silica dust are preventable, they continue to occur and cause disability or death. The effectiveness of both a commercially available local exhaust ventilation (LEV) system and a water suppression system in reducing silica dust was evaluated separately. The LEV system exhausted 0.24, 0.13, or 0.12 m(3)/sec of dust laden air, while the water suppression system supplied 0.13, 0.06, 0.03, or 0.02 L/sec of water to the saw blade. Using a randomized block design, implemented under laboratory conditions, the aforementioned conditions were evaluated independently on two types of concrete roofing tiles (s-shape and flat) using the same saw and blade. Each engineering control (LEV or water suppression) was replicated eight times, or four times for each type of tile. Analysis of variance was performed by comparing the mean airborne respirable dust concentrations generated during each run and engineering control treatment. The use of water controls and ventilation controls compared with the "no control" treatment resulted in a statistically significant (p < 0.05) reduction of mean respirable dust concentrations generated per tile cut. The percent reduction for respirable dust concentrations was 99% for the water control and 91% for the LEV. Results suggest that water is an effective method for reducing crystalline silica exposures. However, water damage potential, surface discolorations, cleanup, slip hazards, and other requirements may make the use of water problematic in many situations. Concerns with implementing an LEV system to control silica dust exposures include sufficient capture velocity, additional weight of the saw with the LEV system, electricity connections, and cost of air handling unit. PMID:20169490

Carlo, Rebecca V; Sheehy, John; Feng, H Amy; Sieber, William K

2010-04-01

209

Optimization of discharge types and electrode structure in a cylinder discharge reactor with saw-wheel array electrodes  

NASA Astrophysics Data System (ADS)

The application of corona discharge technology in gas purification and wastewater treatment has been received great attention in recent years. The configuration of discharge electrode and the discharge types directly affect the discharge power and the power density, and then affect the generation of active species as well as the removal efficiency of pollutants. A novel cylinder-type discharge reactor with saw-wheel-array electrodes was developed for removal of SO2/NOx from flue gas, and influence factors such as electrode structure (ratio of spacing of saw-wheel slices and discharge distance, herein defined as R) and power supply types (positive DC, negative DC, and pulse power) on discharge characteristics and the output power was discussed. The experimental results show that the current and output power of three types of discharges firstly increased with R increasing from 0.3-1.7, and then tended to a stability from 1.7-2.5 while the power density reached a maximum at the ratio of 1.7.

Zhang, Chunyang; Shang, Kefeng; Lu, Na; Li, Jie; Wu, Yan

2013-03-01

210

Highly sensitive room-temperature surface acoustic wave (SAW) ammonia sensors based on Co?O?/SiO? composite films.  

PubMed

Surface acoustic wave (SAW) sensors based on Co3O4/SiO2 composite sensing films for ammonia detection were investigated at room temperature. The Co3O4/SiO2 composite films were deposited onto ST-cut quartz SAW resonators by a sol-gel method. SEM and AFM characterizations showed that the films had porous structures. The existence of SiO2 was found to enhance the ammonia sensing property of the sensor significantly. The sensor based on a Co3O4/SiO2 composite film, with 50% Co3O4 loading, which had the highest RMS value (3.72), showed the best sensing property. It exhibited a positive frequency shift of 3500 Hz to 1 ppm ammonia as well as excellent selectivity, stability and reproducibility at room temperature. Moreover, a 37% decrease in the conductance of the composite film as well as a positive frequency shift of 12,500 Hz were observed when the sensor was exposed to 20 ppm ammonia, indicating the positive frequency shift was derived from the decrease in film conductance. PMID:25151235

Tang, Yong-Liang; Li, Zhi-Jie; Ma, Jin-Yi; Su, Hai-Qiao; Guo, Yuan-Jun; Wang, Lu; Du, Bo; Chen, Jia-Jun; Zhou, Weilie; Yu, Qing-Kai; Zu, Xiao-Tao

2014-09-15

211

Saw-Scaled Viper Bites in Sri Lanka: Is It a Different Subspecies? Clinical Evidence from an Authenticated Case Series  

PubMed Central

The saw-scaled viper (SSV) (Echis carinatus) is considered to be a highly venomous snake in Sri Lanka despite any published clinical justification. Being a rarity, the clinical profile of SSV bites is not well established in Sri Lanka. We report a series of 48 (n-48) SSV bites from the Northern Province of Sri Lanka. The majority (65%) of victims had evidence of local envenoming at the site of the bite; however, 29% showed spontaneous bleeding and 71% had coagulopathy. There were no deaths in the series. The envenoming was mild in contrast to the mortality and significant morbidity associated with SSV bites in West Africa and some parts of India. These observations need to be further explored with laboratory studies to identify the venom components, study of morphological characteristics, and genetic profiling of the Sri Lankan SSV to see if it is different from the subspecies found elsewhere. PMID:22302858

Gnanathasan, Ariaranee; Rodrigo, Chaturaka; Peranantharajah, Thambipillai; Coonghe, Anthonia

2012-01-01

212

Nonzero $\\theta_{13}$ and Leptogenesis in a Type-I See-saw Model with $A_4$ Symmetry  

E-print Network

In the light of recent discovery of nonzero $\\theta_{13}$, we have analyzed the Altarelli-Feruglio $A_4$ flavor symmetry model extended with additional flavon. The inclusion of the new field leads to the deviation from exact tri-bimaximal neutrino mixing pattern in the context of type-I see-saw by producing a nonzero $\\theta_{13}$ consistent with the recent experimental results at the leading order. A sum rule for light neutrino masses is also obtained in this context. The set-up constraints the two Majorana phases involved in the lepton mixing matrix in terms of $A_4$ parameter space. We have shown that a nonzero lepton asymmetry can be generated while next-to-leading order contributions to the neutrino Yukawa couplings are considered. The two Majorana phases play crucial role in CP-asymmetry parameter and the involvement of $\\theta_{13}$ in it, is exercised.

Karmakar, Biswajit

2014-01-01

213

4E-2 Theoretical and Experimental Study of the Differential Thermal Expansion Effect on the TCD of Layered SAW Temperature Sensors Application to Aluminum Nitride Based Layered Structures  

Microsoft Academic Search

In this paper, we show that the stress and strain fields induced in a layered SAW structure by the thermal expansion of the different layers must be taken into account to compute the global structure temperature coefficient of delay (TCD). Experimental and numerical results are provided. The numerical model is described. It is based at the same time on the

P. Nicolay; O. Elmazria; B. Assouar; F. Sarry; L. Lebrizoual

2007-01-01

214

THE BLACK BOX As many of you saw in the "Talent Champions" video, the Talent Management Panel meetings are a critical and  

E-print Network

THE BLACK BOX MS. ADAMS As many of you saw in the "Talent Champions" video, the Talent Management Panel meetings are a critical and strategic talent management activity. The work done to the human resources community on this point. So, how did I end up on the Talent Management Review Panel

215

High levels of habitat loss and fragmentation limit reproductive success by reducing home range size and provisioning rates of Northern saw-whet owls  

Microsoft Academic Search

Studies of the effects of habitat fragmentation have been heavily biased toward population and community questions, with less attention on the effects of habitat loss and fragmentation on individual behaviour and reproduction. We studied the effects of habitat amount and configuration on the foraging behaviour, provisioning rates and physiological condition of breeding male northern saw-whet owls (Aegolius acadicus) nesting in

Heather Lynn Hinam; Colleen Cassady St. Clair

2008-01-01

216

The Influence of Broadcast Tape-recorded Calls on Captures of Fall Migrant Northern Saw-whet Owls (Aegolius acadicus) and Long-eared Owls (Asio otus)  

E-print Network

(Aegolius acadicus) and Long-eared Owls (Asio otus) David L. Evans1 Abstract.--Nocturnal netting operations whistles simulating the calls of fall migrant Northern Saw-whet Owls (Aegolius acadicus) was broadcast (Aegolius acadicus) was initiated in 1986 at the Little Suamico Ornithological Station near Green Bay

217

Non-radiative complete SAW bandgap of 2D phononic crystals on semi-infinite LiNbO3 substrate  

E-print Network

, for instance drilled with holes [9] or eventually supporting pillars 10. Whereas the non-radiative complete predicted that a piezoelectric PC with square lattice of semi-infinite air holes on Y-cut LiNbO3 substrate acoustic wave (SAW) bandgap on 2D piezoelectric phononic crystals (PC) consisting of finite air hole arrays

Boyer, Edmond

218

Identification and affinity-quantification of ß-amyloid and ?-synuclein polypeptides using on-line SAW-biosensor-mass spectrometry.  

PubMed

Bioaffinity analysis using a variety of biosensors has become an established tool for detection and quantification of biomolecular interactions. Biosensors, however, are generally limited by the lack of chemical structure information of affinity-bound ligands. On-line bioaffinity-mass spectrometry using a surface-acoustic wave biosensor (SAW-MS) is a new combination providing the simultaneous affinity detection, quantification, and mass spectrometric structural characterization of ligands. We describe here an on-line SAW-MS combination for direct identification and affinity determination, using a new interface for MS of the affinity-isolated ligand eluate. Key element of the SAW-MS combination is a microfluidic interface that integrates affinity-isolation on a gold chip, in-situ sample concentration, and desalting with a microcolumn for MS of the ligand eluate from the biosensor. Suitable MS-acquisition software has been developed that provides coupling of the SAW-MS interface to a Bruker Daltonics ion trap-MS, FTICR-MS, and Waters Synapt-QTOF- MS systems. Applications are presented for mass spectrometric identifications and affinity (KD) determinations of the neurodegenerative polypeptides, ß-amyloid (Aß), and pathophysiological and physiological synucleins (?- and ß-synucleins), two key polypeptide systems for Alzheimer's disease and Parkinson's disease, respectively. Moreover, first in vivo applications of ?Syn polypeptides from brain homogenate show the feasibility of on-line affinity-MS to the direct analysis of biological material. These results demonstrate on-line SAW-bioaffinity-MS as a powerful tool for structural and quantitative analysis of biopolymer interactions. PMID:24845351

Slamnoiu, Stefan; Vlad, Camelia; Stumbaum, Mihaela; Moise, Adrian; Lindner, Kathrin; Engel, Nicole; Vilanova, Mar; Diaz, Mireia; Karreman, Christiaan; Leist, Marcel; Ciossek, Thomas; Hengerer, Bastian; Vilaseca, Marta; Przybylski, Michael

2014-08-01

219

Standardized evaluation of chemical compositions of LiTaO3 single crystals for SAW devices using the LFB ultrasonic material characterization system.  

PubMed

The line-focus-beam ultrasonic material characterization (LFB-UMC) system is applied to compare and evaluate tolerances provided independently for the Curie temperature T(C) and lattice constant a to evaluate commercial LiTaO3 single crystals by measuring the Rayleigh-type leaky surface acoustic wave (LSAW) velocities V(LSAW). The relationships between V(LSAW), and T(C) and a measured by individual manufacturers were obtained experimentally using 42 degrees Y X-LiTaO3 wafers as specimens from three crystal manufacturers. In addition, the relationship between V(LSAW) and SH-type SAW velocities V(SAW) that are actually used for the SAW device wafers was obtained through calculations, using the chemical composition dependences of the acoustical physical constants for LiTaO3 crystals reported previously. The result of a comparison between the T(C) tolerance of +/-3 degrees C and the a tolerance of +/-0.00002 nm through the common scale of V(LSAW) or V(SAW) demonstrated that the a tolerance is 1.6 times larger than the T(C) tolerance. Furthermore, we performed a standardized comparison of statistical data of T(C) and a for LiTaO3 crystals grown by two manufacturers during 1999 and 2000, using V(LSAW). The results clarified the differences of the average chemical compositions and of the chemical composition distributions among the crystal ingots between the two manufacturers. A guideline for the standardized evaluation procedure has been established for the SAW-device wafer specifications by the LFB-UMC system. PMID:11989701

Kushibiki, Jun-ichi; Ohashi, Yuji; Ujiie, Takaaki

2002-04-01

220

Field portable detection of VOCs using a SAW/GC system. Final report, June 21, 1994--September 21, 1996  

SciTech Connect

This report describes research on a fast GC vapor analysis system which uses a new type of Surface Acoustic Wave detector technology to characterize organic contamination in soil and groundwater. The project was sponsored by the Department of Energy, Morgantown Energy Technology Center, whose mission, in addition to other goals, is the development of tools and methods for characterization, remediation, and monitoring of underground environmental conditions. The research tasks were to demonstrate detectability and specificity of a Surface Acoustic Wave Gas Chromatograph (SAW/GC) to a representative number of VOC materials followed by field demonstrations of the new technology at a DOE site. All tasks of the project were successfully carried out and a fast vapor analysis system based upon a new type of Surface Acoustic Wave detector technology was developed. The prototype analyzer has the ability to characterize organic contamination in soil and groundwater at the part per billion level in less than 10 seconds. The detector is unique because it utilized an uncoated quartz crystal, contrary to current developments of using coated crystals.

Chang, F.; Staples, E.J.

1998-06-01

221

Production of Xylanase from Arthrobacter sp. MTCC 6915 Using Saw Dust As Substrate under Solid State Fermentation  

PubMed Central

Saw dust was used as substrate for xylanase production from Arthrobacter sp. MTCC 6915. The study of period of incubation, temperature, pH, carbon, and nitrogen sources for xylanase production was optimized. Xylanase production was found to be optimum at an incubation period of 96?hrs (117.0?U/mL), temperature 30°C (105.0?U/mL), and pH 9.0 (102.9?U/mL). The results showed that the xylanase production was found to be higher in the presence of carboxymethylcellulose (176.4?U/mL) and dextrose (126.0?U/mL). It was also observed that peptone (170.1?U/mL) and beef extract (161.7?U/mL) supported maximum xylanase production.The enzyme was characterized and found to be fairly active at pH 9 (764.4?U/mL) and temperature 60°C (819?U/mL). Even in the present study, a major difference in the production temperature (30°C) and optimal temperature (60°C) of the enzyme activity was observed. However, the pH of the production media and the enzyme activity were found to be the same (pH 9). PMID:22013512

Murugan, Sevanan; Arnold, Donna; Pongiya, Uma Devi; Narayanan, P. M.

2011-01-01

222

Phases of the SAW reflection and transmission coefficients for short reflectors on 128 degree LiNbO3.  

PubMed

We study numerically the phase of surface acoustic waves reflected by or transmitted through short reflectors comprising only 1-3 aluminium electrodes on 128 degree YX-cut lithium niobate (LiNbO3). The electrodes have a finite thickness, and they are either open-circuited or grounded. The center-to-center distance between adjacent electrodes d corresponds roughly either to half of the characteristic wavelength d proportional to lambda0/2 or to d proportional to lambda0, for the reflectors operating at the fundamental and second harmonic modes, respectively. We use software based on the finite-element and boundary-element methods (FEM/BEM) for numerical experiments with a tailored test structure having 3 interdigital transducers (IDTs), simulating experimental conditions with an incident wave and reflected and transmitted surface acoustic wave (SAW). Using artificial enhancement of time resolution in conjunction with the fast Fourier transform (FFT) and time-gating, calculation of the Y-parameters in a relatively wide frequency range allows us to determine the phase of the reflection and transmission coefficients. PMID:15690727

Lehtonen, Saku; Plessky, Victor P; Béreux, Natacha; Salomaa, Martti M

2004-12-01

223

Air cavity-based Fabry-Perot interferometer sensor fabricated using a sawing technique for refractive index measurement  

NASA Astrophysics Data System (ADS)

We have demonstrated a refractive index sensor based on a fiber optic Fabry-Perot (FP) interferometer with an open air cavity fabricated using a one-step mechanical sawing technique. The sensor head consists of a short FP cavity near the fiber patch cord tip, which was assembled by joining a ceramic ferrule and a single-mode fiber together. Owing to the open air cavity in the sensor head, various liquid samples with different refractive index can fill in-line air cavity, which makes the device usable as a refractometer. Moreover, due to the sensor head encircled with the robust ceramic ferrule, the device is attractive for sensing measurement in harsh environments. The sensor was tested in different refractive index solutions. The experimental result shows that the attenuation peak wavelength of the sensor is shifted toward a shorter wavelength with increasing refractive index, and the refractive index sensitivity is ˜92.5 nm/refractive index unit (RIU) and 73.75 dB/RIU. The proposed sensor can be used as an in-line refractometer for many potential applications in the sensing field.

Jung, Eun Joo; Lee, Woo-Jin; Kim, Myoung Jin; Hwang, Sung Hwan; Rho, Byung Sup

2014-01-01

224

Antigen-antibody selective recognition using LiTaO3 SH-SAW sensors: investigations on macromolecules effects on binding kinetic constants  

NASA Astrophysics Data System (ADS)

A gravimetric surface acoustic wave (SAW) biosensor, based on the biotin-streptavidin and antistreptavidin-streptavidin recognitions, has been carried out. A network analyser and a pulse excitation technique were used to monitor both amplitude and phase changes. The SAW biosensor presented a total selective recognition of streptavidin-antistreptavidin and HRPstreptavidin-antistreptavidin. The presence of HRP (Horseradish peroxidase) affects neither the selectivity nor the sensitivity (of order of 0.25°/nM) of the biosensor, nevertheless, it causes a reduction of binding kinetics by a factor ranging between 2 to 5, as well as a diminution of antistreptavidin saturation concentration (of 40%). Results showed that equilibrium constants can be different, depending on evaluation method (from saturation values or from linear part of the output signal variation according to solution concentration).

Bergaoui, Y.; Zerrouki, C.; Fourati, N.; Fougnion, J. M.; Abdelghani, A.

2011-10-01

225

The Visual Response Properties of Neurons in the Nucleus of the Basal Optic Root of the Northern Saw-Whet Owl (Aegolius acadicus)  

Microsoft Academic Search

The nucleus of the basal optic root (nBOR) in birds is a component of the accessory optic system (AOS) which is involved in the analysis of visual flowfields normally resulting from self-motion. Using standard extracellular techniques, we recorded from 81 single-unit and multi-unit clusters in the nBOR of the northern saw-whet owl, Aegolius acadicus, an avian species that has a

Douglas R. Wylie; Steven W. Shaver; Barrie J. Frost

1994-01-01

226

Northern Saw-whet Owls (Aegolius acadicus) Captured at Cape May Point, NJ, 1980-1994: Comparison of Two Capture Techniques  

Microsoft Academic Search

During autumn migration 1980-1994, 1,270 Northern Saw-whet Owls (Aegolius acadicus) (NSWO) were captured and banded at Cape May Point, NJ. From 1980-1988, captures were effected by passive mist-netting. From 1989-1994, an audiolure (NSWO territorial song broadcast loudly from dusk to dawn in the trapping area) was used to enhance capture rate. 638 NSWOs were captured with an audiolure during five

Katharine E. Duffy; Patrick E. Matheny

227

A miniaturized 3 × 3-mm SAW antenna duplexer for the US-PCS band with temperature-compensated LiTaO3\\/sapphire substrate  

Microsoft Academic Search

This paper describes a temperature-stable and miniaturized SAW antenna duplexer for the 1.9 GHz US-PCS band that uses a temperature-compensated 42° Y-X:LiTaO3\\/sapphire bonded substrate. In this duplexer, the temperature coefficient of frequency is reduced to half or two-thirds of that of a conventional LiTaO3 substrate. Also, it is shown that our new duplexer has a smaller insertion loss and offers

Jun Tsutsumi; Shogo Inoue; Yasuhide Iwamoto; Michio Miura; Takashi Matsuda; Yoshio Satoh; Toshio Nishizawa; Masanori Ueda; Osamu Ikata

2004-01-01

228

Interaction of High-Coupling Leaky SAW with Bulk Waves Under Metallic-Grating Structure on 36° YX-LiTaO3  

Microsoft Academic Search

The paper deals with leaky SAW (LSAW) propagating under metallic-grating structure on 36OYX-LiTa03, and its interaction with bulk waves. Theoretical analysis has shown that the attenuation of LSAW unusually changes with frequency about the stopband of the grating: the attenuation is negli- gibly small at frequencies lower than the stopband, whereas it rapidly increases when the frequencies are raised above

K. Y. Hashimoto; M. Yamaguchi; H. Kogo

1985-01-01

229

In vivo assessment of botanical supplementation on human cytochrome P450 phenotypes: Citrus aurantium, Echinacea purpurea, milk thistle, and saw palmetto  

Microsoft Academic Search

Objectives: Phytochemical-mediated modulation of cytochrome P450 (CYP) activity may underlie many herb-drug interactions. Single–time point phenotypic metabolic ratios were used to determine whether long-term supplementation of Citrus aurantium, Echinacea purpurea, milk thistle (Silybum marianum), or saw palmetto (Serenoa repens) extracts affected CYP1A2, CYP2D6, CYP2E1, or CYP3A4 activity.Methods: Twelve healthy volunteers (6 women, 6 men) were randomly assigned to receive C

Bill J. Gurley; Stephanie F. Gardner; Martha A. Hubbard; D. Keith Williams; W. Brooks Gentry; Julie Carrier; Ikhlas A. Khan; David J. Edwards; Amit Shah

2004-01-01

230

Reduction in airborne contamination levels at the 9201-5 Arc Melt sawing operation. A Y-12 Plant 1982 ALARA goal  

SciTech Connect

Lowering the uranium airborne contamination level at the two saws in the 9201-5 Arc Melt Area was chosen as a Y-12 Plant As-Low-As-Reasonably-Achievable (ALARA) goal for 1982. This priority was convincingly communicated to those involving by giving specific instructions to suspend saw operations any time there was evidence of a problem until that problem could be corrected. Using control charts on air flow rates into the saw enclosures and pressure drops across filters in the saw ventilation (Delta Phase I) exhaust system, it was possible to decide when filter changes or other adjustments were necessary to maintain the exhaust flow rates needed for improved airborne contamination control. The keeping of these charts, along with the actions taken on the basis of the data gathered, made it possible to meet the goal of reducing airborne contamination levels in 1982, as compared with 1981, although production in the Arc Melt Area increased significantly. These data also showed that use of one brand of filter in the prefilter system resulted in the need to change filters more frequently than when another brand was used. This fact triggered an investigation which revealed the cause for the shorter useful life of that filter and a request that only specifically approved filters be purchased for use in this system. Use of these control data also made it possible to establish that the exhaust system operated more effectively without the Roto-clone hydrostatic pecipitators because exhaust air flow was increased without reduction in filter life.

Beck, D.E.; West, C.M.

1983-02-01

231

Beneficial effect of diffraction on the frequency response of a 250MHz SAW mobile IF resonator-filter with long IDTs and triple longitudinal modes on quartz  

Microsoft Academic Search

Diffraction theory is applied to model the frequency response of a low-loss (~2 dB) 250-MHz SAW mobile IF resonator-filter (BW ~0.2%) with long-pair IDTs and triple longitudinal modes on ST-quartz, as applicable to circuitry such as for the Japanese Personal Handy Phone (PHP). In a simplified approach, a parabolic diffraction approximation is applied, with the IDT acoustic aperture conceptually sub-divided

C. K. Campbell

1998-01-01

232

Influence of spinel substrate and over-layer for enhanced SAW and AO properties with KNbO3 thin film  

Microsoft Academic Search

Surface acoustic wave (SAW) propagation characteristics have been studied using modeling calculations for a potassium niobate (KNbO3) thin film-layered structure with [001] and [110] orientation on a single crystal spinel (MgAl2O4) substrate, and a spinel buffer layer on silicon. Variation in the electromechanical coupling and acoustic attenuation has been compared. A significantly high value of coupling factor (kmax2=23%) is obtained

Ranu Nayak; Vinay Gupta; K. Sreenivas

2003-01-01

233

Electric field enhancement due to a saw-tooth asperity in a channel and implications on microscale gas breakdown  

NASA Astrophysics Data System (ADS)

The electric field enhancement due to an isolated saw-tooth asperity in an infinite channel is considered with the goal of providing some inputs to the choice of field enhancement factors used to describe microscale gas breakdown. The Schwarz–Christoffel transformation is used to map the interior of the channel to the upper half of the transformed plane. The expression for the electric field in the transformed plane is then used to determine the electric field distribution in the channel as well as field enhancement near the asperity. The effective field enhancement factor is determined and its dependence on operating and geometrical parameters is studied. While the effective field enhancement factor depends only weakly on the height of the asperity in comparison to the channel, it is influenced significantly by the base angles of the asperity. Due to the strong dependence of field emission current density on electric field, the effective field enhancement factor (?eff) is shown to vary rapidly with the applied electric field irrespective of the geometrical parameters. This variation is included in the analysis of microscale gas breakdown and compared with results obtained using a constant ?eff as is done traditionally. Even though results for a varying ?eff may be approximately reproduced using an equivalent constant ?eff independent of E-field, it might be important for a range of operating conditions. This is confirmed by extracting ?eff from experimental data for breakdown in argon microgaps with plane-parallel cathodes and comparing its dependence on the E-field. While the use of two-dimensional asperities is shown to be a minor disadvantage of the proposed approach in its current form, it can potentially help in developing predictive capabilities as opposed to treating ?eff as a curve-fitting parameter.

Venkattraman, Ayyaswamy

2014-10-01

234

Influence of spinel substrate and over-layer for enhanced SAW and AO properties with KNbO3 thin film.  

PubMed

Surface acoustic wave (SAW) propagation characteristics have been studied using modeling calculations for a potassium niobate (KNbO3) thin film-layered structure with (001) and (110) orientation on a single crystal spinel (MgAl2O4) substrate, and a spinel buffer layer on silicon. Variation in the electromechanical coupling and acoustic attenuation has been compared. A significantly high value of coupling factor (k2max = 23%) is obtained for the (001)KNbO3/spinel structure by introducing an optimum thickness of spinel over-layer for potential wide bandwidth SAW device applications. The dispersion characteristics with the (110) KNbO3 orientation indicate an initial peak in the coupling coefficient value (k2max = 8.8%) at a relatively low KNbO3 film thickness that appears attractive for fabricating devices with thinner films. The KNbO3 film with (001) orientation is found attractive for efficient acousto-optic (AO) device application with the formation of a symmetric waveguide structure (spinel(0.5 microm)/KNbO3(1.0 microm)/spinel). A high value of k2 = 23.5% with 50% diffraction efficiency has been obtained for the spinel(0.5 microm)/KNbO3(1.0 microm)/spinel structure at 1 GHz SAW frequency and 633 nm optical wavelength at a very low input drive power of 15.4 mW. PMID:12839169

Nayak, Ranu; Gupta, Vinay; Sreenivas, Kondepudy

2003-06-01

235

Acoustic microscopy measurement of elastic constants by using an optimization method on measured and calculated SAW velocities: effect of initial c ij values on the calculation convergence and influence of the LFI transducer parameters on the determination of the SAW velocity  

Microsoft Academic Search

The determination of elastic constants in anisotropic solids by line-focus acoustic microscopy (LFAM) is discussed. The velocity of leaky surface acoustic waves (SAWs) has been obtained for different directions of propagation (?) from the V(z) curves. The elastic constants are determined from the comparison of measured and calculated velocities. The principle is based on the minimization of the summation of

M Lematre; Y Benmehrez; G Bourse; J. W Xu; M Ourak

2002-01-01

236

Palaeolimnological evidence for an east-west climate see-saw in the Mediterranean since AD 900  

NASA Astrophysics Data System (ADS)

During the period of instrumental records, the North Atlantic Oscillation (NAO) has strongly influenced inter-annual precipitation variations in the western Mediterranean, while some eastern parts of the basin have shown an anti-phase relationship in precipitation and atmospheric pressure. Here we explore how the NAO and other atmospheric circulation modes operated over the longer timescales of the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA). High-resolution palaeolimnological evidence from opposite ends of the Mediterranean basin, supplemented by other palaeoclimate data, is used to track shifts in regional hydro-climatic conditions. Multiple geochemical, sedimentological, isotopic and palaeoecological proxies from Estanya and Montcortés lakes in northeast Spain and Nar lake in central Turkey have been cross-correlated at decadal time intervals since AD 900. These dryland lakes capture sensitively changes in precipitation/evaporation (P/E) balance by adjustments in water level and salinity, and are especially valuable for reconstructing variability over decadal-centennial timescales. Iberian lakes show lower water levels and higher salinities during the 11th to 13th centuries synchronous with the MCA and generally more humid conditions during the ‘LIA' (15th-19th centuries). This pattern is also clearly evident in tree-ring records from Morocco and from marine cores in the western Mediterranean Sea. In the eastern Mediterranean, palaeoclimatic records from Turkey, Greece and the Levant show generally drier hydro-climatic conditions during the LIA and a wetter phase during the MCA. This implies that a bipolar climate see-saw has operated in the Mediterranean for the last 1100 years. However, while western Mediterranean aridity appears consistent with persistent positive NAO state during the MCA, the pattern is less clear in the eastern Mediterranean. Here the strongest evidence for higher winter season precipitation during the MCA comes from central Turkey in the northeastern sector of the Mediterranean basin. This in turn implies that the LIA/MCA hydro-climatic pattern in the Mediterranean was determined by a combination of different climate modes along with major physical geographical controls, and not by NAO forcing alone, or that the character of the NAO and its teleconnections have been non-stationary.

Roberts, Neil; Moreno, Ana; Valero-Garcés, Blas L.; Corella, Juan Pablo; Jones, Matthew; Allcock, Samantha; Woodbridge, Jessie; Morellón, Mario; Luterbacher, Juerg; Xoplaki, Elena; Türke?, Murat

2012-03-01

237

Temporal Dynamics of Vegetation Phenological in Mongolia Using NOAA-AVHRR Data -- the Saw-tooth Pattern  

NASA Astrophysics Data System (ADS)

The objective of this study was to examine the temporal trend of the Mongolian natural vegetation phenology during 18 years between 1981 and 1999, in various ecosystems, by using two Pathfinder NOAA-AVHRR Land (PAL) products -- the Normalized Different Vegetation Index (NDVI) and Land Surface Temperature (LST). Mongolia was selected as a study area for implementing the above objectives since it enables a regional research (rather than continental or global scale). The north-south cross section is relatively short (ca. 500 km) between latitude 42o to 52o N, and covers 6 different ecosystems -- Tundra, Mountain, Forest Steppe, Steppe, Desert Steppe, and Desert. Along this cross section, precipitation ranges from more than 350 (in the north) to less than 75 mm. The entire territory consists only on natural vegetation without anthropogenic influences such as urban heat island, industry, agricultural crops etc. For estimating the growing season dynamics, an accurate determination of the beginning (greenup onset) and ending (senescence, or decline) dates of the vegetation phenology were computed. For achieving these dates four combined criteria were calculated based on the NDVI and LST datasets. Main finding of the project shows that no significant results are achieved when analyzing the entire study period over 18 years. However, when breaking the period into two sub-periods, from 1982 to 1991 and from 1992 to 1999, phenology parameters can be easily detected and results are more significant. It is shown that on the average of the entire territory, the onset starts 10 and 16 days earlier, and the decline occurs 6 and 3 days later, during the first and second sub-periods, respectively. Consequently, on the average the phenology cycle of the growing season lasts 17--19 days longer. The above-mentioned sub-periods can be visualized as a saw-tooth pattern. It is due to the eruption of Mount Pinatubo in the Philippines in June 1991, led to a global cooling of 0.5oC due to aerosols injected into the stratosphere. The three phenological parameters were interrupted by the event for 1--2 years, but both continued afterwards.

Karnieli, A.; Bayasgalan, M.; Khudulmur, S.; Bayarjargal, Y.; Tucker, C. J.

2004-12-01

238

Dissolution-induced surface modifications and permeability changes associated with fluid flow through an abraded saw-cut in single crystal quartz  

E-print Network

DISSOLUTION-INDUCED SURFACE MODIFICATIONS AND PERMEABILITY CHANGES ASSOCIATED WITH FLUID FLOW THROUGH AN ABRADED SAW-CUT IN SINGLE CRYSTAL QUARTZ A Thesis by JAlvlES ALBERT BOWMAN, JR, Submined to the Oflice of Graduate Studies of Texas A8r...-CUT IN SINGLE CRYSTAL QUARTZ A Thesis by JAMES ALBERT BOWMAN, JR. Approved as to style and content by: Brann Jo on (Co-Chairman ommittee) Thomas T. Tieh (Co-Chairman of Committee) Andrew )ash (Member) Frank Dale Morgan (Member) John H. pang (Head...

Bowman, James Albert

2012-06-07

239

Experimental and theoretical investigation for temperature characteristics and propagation losses of SAWs on SiO2\\/Al\\/LiTaO3  

Microsoft Academic Search

Improvement of temperature coefficients of frequency (TCFs) for LiTaO3 substrate was investigated. SAW resonators formed on SiO2\\/Al\\/36°Y-X LiTaO3 substrate with various kinds of SiO2 relative thickness were examined experimentally and theoretically. A zero TCF at fr was obtained for h\\/??0.31, while that at fa was obtained for h\\/??0.36 from experiments. Moreover, the experimental propagation losses revealed also different characteristics between

K. Asai; M. Hikita; A. Isobe; K. Sakiyama; T. Tada

2002-01-01

240

An evaluation of an aftermarket local exhaust ventilation device for suppressing respirable dust and respirable crystalline silica dust from powered saws.  

PubMed

The objective of this study was to quantify the respirable dust and respirable silica exposures of roofing workers using an electric-powered circular saw with an aftermarket local exhaust ventilation attachment to cut concrete roofing tiles. The study was conducted to determine whether the local exhaust ventilation attachment was able to control respirable dust and respirable silica exposure below occupational exposure limits (OELs). Time-integrated filter samples and direct reading respirable dust concentrations were evaluated. The local exhaust ventilation consisted of a shroud attached to the cutting plane of the saw; the shroud was then connected to a small electric axial fan, which is intended to collect dust at the point of generation. All sampling was conducted with the control in use. Roofers are defined as those individuals who only lay tiles. Cutters/roofers are defined as those workers who operate the powered saw to cut tiles and also lay tiles. Respirable dust from this evaluation ranged from 0.13 to 6.59 milligrams per cubic meter (mg/m(3)) with a geometric mean of 0.38 mg/m(3) for roofers and from 0.45 to 3.82 mg/m(3) with a geometric mean of 1.84 mg/m(3) for cutters/roofers. Cutters/roofers usually handle areas close to crevices, edges, or tips of the roof whereas roofers handle areas where complete tiles can be placed. The respirable dust exposures for all cutters/roofers indicated concentrations exceeding the Occupational Safety and Health Administration's (OSHA) permissible exposure limit (PEL) for respirable dust containing silica; it was also exceeded for some of the roofers. The respirable silica concentrations ranged from 0.04 to 0.15 mg/m(3) with a geometric mean of 0.09 mg/m(3) for roofers, and from 0.13 to 1.21 mg/m(3) with a geometric mean of 0.48 mg/m(3) for cutters/roofers. As with respirable dust, the respirable silica exposures for cutters/roofers were higher than the exposures for roofers. PMID:25148513

Garcia, Alberto; Jones, Erica; Echt, Alan S; Hall, Ronald M

2014-11-01

241

The visual response properties of neurons in the nucleus of the basal optic root of the northern saw-whet owl (Aegolius acadicus).  

PubMed

The nucleus of the basal optic root (nBOR) in birds is a component of the accessory optic system (AOS) which is involved in the analysis of visual flowfields normally resulting from self-motion. Using standard extracellular techniques, we recorded from 81 single-unit and multi-unit clusters in the nBOR of the northern saw-whet owl, Aegolius acadicus, an avian species that has a visual system with frontal emphasis. These cells responded best to large patterns of random dots moving either upward (52%), downward (31%) or nasal to temporal (N-T; contralateral visual field; 15%). Only 2 units (2%) preferred temporal to nasal motion. 'Up' units were found in the dorsal portion of the nucleus whereas 'Down' units were located more ventrally. The N-T units were found in both the lateral margin of the nucleus and ventral to the Down units in the lateral half of the nucleus. About half of the units tested (10/19) responded to stimulation of the ipsilateral as well as the contralateral eye. For all but one cell, the direction preference of both eyes was the same in visual space. When compared with previous studies of pigeons (Columba livia) and chickens (Gallus domesticus), these findings reveal that the nBOR in all three avian species have important similarities with respect to direction preference and functional compartmentalization. Furthermore, the high proportion of binocular neurons found in the nBOR of the saw-whet owl is similar to the condition generally reported in frontal eyed mammals and hence may reflect adaptation. PMID:8306188

Wylie, D R; Shaver, S W; Frost, B J

1994-01-01

242

Effects of different levels of wheat bran, rice bran and maize powder supplementation with saw dust on the production of shiitake mushroom (Lentinus edodes (Berk.) Singer)  

PubMed Central

The cultivation of shiitake mushroom (Lentinus edodes) is increasing rapidly in Bangladesh due to its nutritional and medicinal importance with excellent flavor and longer shelf life. With the aim of increased production, we have cultivated L. edodes on saw dust (SD) supplemented with different levels (10%, 15%, 20%, 25%, 30%, 35% and 40%) of wheat bran (WB), rice bran (RB), maize powder (MP) and their combination (WB+RB+MP = 1:1:1) to investigate the growth, yield and quality of this mushroom. Most of the growth, yield and quality parameters varied significantly when mushrooms were cultivated with different levels of supplementation. The yield of mushroom was increased with the level of each supplementation upto a certain level, and then decreased. SD supplemented with 25% WB produced the highest number of fruiting bodies (34.8/500 g packet), highest biological yield (153.3/500 g packet), and biological efficiency (76.6%) of L. edodes. But the yield of the best quality mushroom was observed on SD with 40% WB supplementation; however, the qualities were not always supplementation dose dependent. In this study, we report that 25% WB supplementation with SD may be very effective for higher yield and 40% WB supplementation for better quality of L. edodes. PMID:23961143

Moonmoon, Mahbuba; Shelly, Nasrat Jahan; Khan, Md. Asaduzzaman; Uddin, Md. Nazim; Hossain, Kamal; Tania, Mousumi; Ahmed, Saleh

2010-01-01

243

Mechanical comparison of fixation techniques for the offset V osteotomy: a saw bone study 1 1 No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject article  

Microsoft Academic Search

Four different techniques for the fixation of an offset V bunionectomy were tested on solid-foam saw-bone models for the purpose of determining the strongest form of fixation for the osteotomy. Twenty identical models were placed into 4 different groups. Groups varied as to the placement and caliber of fixation. Models were loaded with a servo-hydraulic testing machine until failure of

Keith Jacobson; Adam Gough; Samuel S Mendicino; Matthew S Rockett

2003-01-01

244

A strong control of the South American SeeSaw on the intra-seasonal variability of the isotopic composition of precipitation in the Bolivian Andes  

NASA Astrophysics Data System (ADS)

Water stable isotopes (?) in tropical regions are a valuable tool to study both convective processes and climate variability provided that local and remote controls on ? are well known. Here, we examine the intra-seasonal variability of the event-based isotopic composition of precipitation (?D Zongo) in the Bolivian Andes (Zongo valley, 16°20'S-67°47'W) from September 1st, 1999 to August 31st, 2000. We show that the local amount effect is a very poor parameter to explain ?D Zongo. We thus explore the property of water isotopes to integrate both temporal and spatial convective activities. We first show that the local convective activity averaged over the 7-8 days preceding the rainy event is an important control on ?D Zongo during the rainy season (~ 40% of the ?D Zongo variability is captured). This could be explained by the progressive depletion of local water vapor by unsaturated downdrafts of convective systems. The exploration of remote convective controls on ?D Zongo shows a strong influence of the South American SeeSaw (SASS) which is the first climate mode controlling the precipitation variability in tropical South America during austral summer. Our study clearly evidences that temporal and spatial controls are not fully independent as the 7-day averaged convection in the Zongo valley responds to the SASS. Our results are finally used to evaluate a water isotope enabled atmospheric general circulation model (LMDZ-iso), using the stretched grid functionality to run zoomed simulations over the entire South American continent (15°N-55°S; 30°-85°W). We find that zoomed simulations capture the intra-seasonal isotopic variation and its controls, though with an overestimated local sensitivity, and confirm the role of a remote control on ? according to a SASS-like dipolar structure.

Vimeux, Françoise; Tremoy, Guillaume; Risi, Camille; Gallaire, Robert

2011-07-01

245

The effect of a SiO2 layer on the performance of a ZnO-based SAW device for high sensitivity biosensor applications  

NASA Astrophysics Data System (ADS)

The properties of ZnO/SiO2/Si surface acoustic wave (SAW) love mode biosensors are studied in this paper. This specific structure is very suitable for biosensors since the reactive ZnO surface offers the opportunity for effective bio-ZnO interfaces, and the development of sensors directly on Si substrates provides the chance for full integration with read-out and signal processing circuitry in the mature Si technology. However, investigations of the dependence of buffer layer SiO2 on the performance of biosensors are very few. Therefore, the main interest of this paper is to find the relation between the properties of biosensors and the SiO2 layer. Some important results are obtained by solving the coupled electromechanical field equations. It is found that the mass loading sensitivity can be further improved by adding the SiO2 layer; furthermore, the maximal sensitivity of the biosensors can be obtained by adjusting the thicknesses of the two layers. Accordingly, consideration of the buffer layer is very important in the optimization of devices. On the other hand, it is found that the thickness of the piezoelectric guiding layer has an evident effect on the electromechanical coupling coefficient, while that of the SiO2 layer has a tiny effect on it. Moreover, we find that the effect of initial stresses on the properties of biosensors depends on the distribution of acoustic flow power in the two layers. This analysis is meaningful for the manufacture and applications of the ZnO/SiO2/Si structure love wave biosensor.

Chen, Xi; Liu, Dali; Chen, Jiansheng; Wang, Guolei

2009-11-01

246

Venom lethality and diet: differential responses of natural prey and model organisms to the venom of the saw-scaled vipers (Echis).  

PubMed

The composition of snake venoms shows a high degree of variation at all taxonomic levels, and natural selection for diet has been implicated as a potential cause. Saw-scaled vipers (Echis) provide a good model for studying this phenomenon. The venoms of arthropod feeding species of Echis are significantly more toxic to natural scorpion prey than those of species which feed predominantly upon vertebrate prey. Although testing venom activity on natural prey is important for our understanding of the evolution of venom, natural prey species are often difficult to obtain in sufficient numbers for toxinological work. In order to test the viability of using cheaper and more easily available model organisms for toxicity assessments in evolutionary research, and the extent to which toxicity of arthropod-eating Echis venoms is increased to arthropods in general or targeted to certain groups, we conducted median lethal dosage (LD(50)) and time to death trials using the desert locust (Schistocerca gregaria) as a model arthropod, rarely consumed by wild Echis. The venoms of arthropod specialist Echis were found to be significantly more toxic to locusts than the venom of a vertebrate feeding outgroup (Bitis arietans), and one arthropod specialist venom was found to be more toxic than those species which feed upon arthropods infrequently or not at all. The venoms of arthropod specialists were also found to cause death and incapacitation faster than the vertebrate feeding outgroup. Despite some similarity of trends, there are considerable differences between the response of natural prey (scorpions) and a model arthropod (locust) to the venoms of Echis species. This suggests that when possible, natural prey rather than convenient model organisms should be used to gain an understanding of the functional significance of variation in venom composition in snakes. PMID:22079297

Richards, D P; Barlow, A; Wüster, W

2012-01-01

247

Gilgamesh: He Who Saw All.  

ERIC Educational Resources Information Center

The historical Gilgamesh was a Sumarian king of Uruk around 2700 B.C. Sumarian fragments of the legend that grew up around him have been found dating back to about 2000 B.C. These lesson plans on Gilgamesh were developed during the Office of Resources for International and Area Studies (ORIAS) summer institute on history through literature, in…

California Univ., Berkeley. Office of Resources for International and Area Studies.

248

We saw the integrated project.  

PubMed

China's Integrated Project initially used parasite control activities to stimulate community interest in general health improvements within the family and, ultimately, in the practice of family planning. An International Monitoring Mission visited 2 project pilot areas (Tumotezuo County of Hohhot Municipality in Inner Mongolia and Jiupu District in Liaoning Province) during the second cycle (1987-89) of program activities. Major findings included significant decreases in parasite infection rates, declines in infant mortality that far exceeded those recorded in non-project areas, and increases in contraceptive prevalence. For example, the infant mortality rate dropped from 35.1/1000 in 1986 to 21.5/1000 in 1989 in Tumotezuo County and from 31.4/1000 to 14.6/1000 in Jiupu District. In the same 3-year period, the contraceptive prevalence rate went from 83.2% to 92.3% in Jiupu District and, in Tumotezuo County, from 91.8% to 93.7% among the Han and from 65.9% to 77.2% among Mongols. Another offshoot of the Integrated Project was the use of local funds for community development activities such as the construction of roads, latrines, bridges, clinics, water supply systems, and housing for the elderly. Progressive expansion of the project to other areas is planned. Among the recommendations of the Monitoring Mission were: more seminars to facilitate an exchange of experiences, testing of project strategies in poorer remote areas, continuous infusion of innovative strategies to sustain popular participation, encouragement of local fund raising, routine collection of baseline data, and a more thorough review of training programs for village doctors, family planning volunteers, and village leaders. PMID:12284060

1991-06-01

249

Clay Swelling and Particle Redistribution in a Saw-Cut Fracture in the Paintbrush Nonwelded Unit of the Topopah Spring Tuff  

NASA Astrophysics Data System (ADS)

Flow through the altered nonwelded tuffs of the Paintbrush unit (PTn) at Yucca Mountain, Nevada, is thought to be primarily through the highly porous rock matrix. Due to matrix flow and the sloping structure of the unit, the PTn is thought to divert downward-flowing water laterally. However, large fractures and faults in the PTn may also provide pathways for flow through the unit and these may prevent or interrupt lateral flow through the unit. In field tests where water was released directly into a fault in the altered PTn, flow rates declined over time. To evaluate processes such as matrix swelling and particle redistribution that might explain this decline, we performed a laboratory experiment using a 12 cm diameter x 21.6 cm long core with an axial saw-cut fracture. The core was extracted from the argillic Tpbt2C layer. We monitored permeability, inlet and outlet flow rate, and the volume change of the rock core (contained in a pressure vessel) while flow occurred through the fracture and matrix. Water containing various sodium chloride concentrations (1 M, 0.5 M, 0 M, and 1M) was flowed through the fracture to observe the effect of salt concentration on fracture permeability in the smectite-rich rock core. The sample swelled initially, despite the high salt concentration (1 M) of the inlet water. The permeability of the fracture decreased with declining salt concentration and increased with increasing salt concentration indicating that clay swelling decreased fracture aperture and reduced the flow rate. Particle redistribution (dispersion and flocculation) was indicated by particles in the effluent. Particles from lower salinity flows remained suspended in the effluent container, while those from higher salinity flows settled more easily, were larger, and more compact. If particle redistribution were controlling the flow, the permeability should have increased during low salinity water flow because of particle erosion. This work was supported by the Director, Office of Civilian Radioactive Waste Management, U.S. Department of Energy, through Memorandum Purchase Order EA9013MC5X between Bechtel SAIC Company, LLC and the Ernest Orlando Lawrence Berkeley National Laboratory (Berkeley Lab). The support is provided to Berkeley Lab through the U.S. Department of Energy Contract No. DE-AC03-76SF00098.

Kneafsey, T. J.; Oldenburg, C. M.; Salve, R.

2001-12-01

250

An east-west climate see-saw in the Mediterranean during the last 2.6 ka: evidence and mechanisms  

NASA Astrophysics Data System (ADS)

Global precipitation anomalies during the Common Era show a spatial coherency that appears to be about an order of magnitude lower (i.e. smaller) than for temperature changes, as some areas became wetter while others experienced drought (Seager et al., 2007, Quat. Sci. Rev. 26, 2322-36). The Mediterranean basin (10°W-40°E; 30°-45°N) is influenced by some of the main mechanisms acting upon the global climate system and its regional water resources are sensitive to hydro-climatic variations. Reconstructing the timing, intensity, and patterns of hydrological variability in the Mediterranean is important for testing spatial-temporal coherency in palaeo-precipitation, and for understanding underlying climate forcing mechanisms. The region offers a broad spectrum of documentary information and natural archives which allow high-resolution climate reconstructions (Luterbacher et al., 2012, In: Lionello et al. (eds) The Mediterranean Climate: from past to future. Elsevier, pp. 87-185). During the period of instrumental records, the NAO has strongly influenced inter-annual precipitation variations in the western Mediterranean, while parts of the eastern basin have shown an anti-phase relationship in precipitation and atmospheric pressure. A wide array of proxy-climate data from Iberia and Morocco indicate overall drier conditions during the Medieval Climate Anomaly (MCA) and a generally wetter climate in the Little Ice Age (LIA)(Moreno et al., 2012, Quat. Sci. Rev. 43, 16-32). This pattern is consistent with strong NAO forcing of western Mediterranean climate over the last 1.1 ka (Trouet et al., 2009; Science 324, 78-80). High-resolution palaeolimnological evidence from central Anatolia exhibit an opposite pattern, implying that an east-west climate see-saw operated in the Mediterranean basin during the LIA and MCA (Roberts et al., 2012; Glob. Planet. Change 84-85, 23-34). However, the strongest evidence for higher (lower) winter season precipitation during the MCA (LIA) does not come from the southeast sector of the Mediterranean basin, as would be expected from the pattern of NAO forcing seen during the instrumental period. Prior to the MCA, many proxy-climate records show changes of significantly larger amplitude than during the last millennium, notably during and after the Roman period. However, absolute chronologies become less precise with dating errors of ±>50 yr (Dermody et al., 2012; Clim. Past 8, 637-651), making correlations less robust. Before 2.6 ka BP, i.e. coincident with the northern European grenzhorizont, proxy-climate records from the Mediterranean show changes which imply a significant shift in atmospheric boundary conditions (e.g. radiative forcing). It is clear that hydro-climatic trends have been non-uniform across the Mediterranean in recent millennia. The contrasting spatio-temporal patterns across the basin appear to have been determined by a combination of different climate modes along with major physical geographical controls, not by NAO forcing alone, and/or the character of the NAO and its teleconnections have been non-stationary.

Roberts, C.; Moreno-Caballud, A.; Valero-Garces, B. L.; Luterbacher, J.; Xoplaki, E.; Allcock, S. L.

2012-12-01

251

Development of methods of producing large areas of silicon sheet by the slicing of silicon ingots using inside-diameter (I. D. ) saws. Final report, May 1979-April 1980  

SciTech Connect

I.D. wafering equipment, blades and processes were used to develop methods for producing large areas of silicon sheet. Modifications to a 16 inch STC automated saw included programmable feed system; crystal rotating system; and STC dyna-track blade monitoring and control system. By controlling the plating operation and by grinding of the cutting edge, we were able to produce 16 inch I.D. blades with a cutting edge thickness of .22 mm. Crystal rotation mechanism was used to slice 100 mm diameter crystals with a 16 inch blade down to a thickness of .20 mm. Cutting rates with crystal rotation were generally slower than with standard plunge I.D. slicing techniques. Using programmed feeds and programmed rotation, maximum cutting rates were from 0.3 to 1.0 inches per minute.

Aharonyan, P.

1980-01-01

252

Evaluation of Various Herbicides for Saw Greenbrier [Smilax bona-nox L.] and Southern Dewberry [Rubus trivialis Michx.] Control and Bermudagrass [Cynodon dactylon (L.) Pers.] Tolerance and Sharppod Morningglory [Ipomoea trichocarpa var. trichocarpa Ell.] Control in Roundup Ready Flex® and LibertyLink® Cotton Systems  

E-print Network

of dry matter yield, and forage quality were quantified for each of the bermudagrass tolerance trials. Saw greenbriar was best controlled at approximately one year after treatment by triclopyr at 10.9% ae v/v with diesel as the carrier (88-98%), although...

Janak, Travis Wayne

2012-02-14

253

Adaptive deconvolution using a SAW storage correlator  

NASA Astrophysics Data System (ADS)

A new analog adaptive filter for deconvolving distorted signals is described. The filter uses a storage correlator which implements a clipped version of the least mean squared algorithm and uses a special iterative technique to achieve fast convergence. The new filter has a potential bandwidth of 100 MHz and would eventually handle pulsed signals of 10-microsecond width. For signals with time-bandwidth products of less than 100, the adaptation time is less than 1 ms, which allows operation in real time for most applications, including resolution of radar signals in a cluttered environment, removal of echoes from television signals, deconvolution of distorted signals in nondestructive evaluation, and also in telephony. The filter is particularly suited for radar and communications, as it processes signals directly in the VHF range. Two experiments related to ghost suppression of a pulse and to the field of NDE are described in this paper. The results are in good agreement with computer simulations and show a ghost suppression of 15 dB for the first example and a sidelobe suppression of 8 dB for a transducer signal. The adaptation time is less than 450 microseconds.

Bowers, J. E.; Kino, G. S.; Behar, D.; Olaisen, H.

1981-05-01

254

Gravitation as Newton first saw it  

Microsoft Academic Search

A case study is presented to provide teachers of secondary school pupils with some historical background to the problem of gravitation. It outlines the state of knowledge at the end of the 17th century and describes Sir Isaac Newton's contribution. The study is made by trying to reconstruct how Sir Isaac would have reasoned. In particular the problem of the

Brian Gee

1977-01-01

255

Men, Women, and Chain Saws: Gender  

E-print Network

as it became evident that the shrewdest of critics can find fertile ground in any aspect of our culture. Clover, a medievalist, had written extensively on the literature and culture of early northern Europe, especially female heroes and play to male audiences: slasher, occult, and rape-revenge films. Such genres seem

Landweber, Laura

256

Microwave SAW (Surface Acoustic Wave) monochromator  

NASA Astrophysics Data System (ADS)

An acoustic surface wave device is configured as a bandpass filter. The device has similar groups of sinusoidal corrugations cut into portions of both the top and bottom surfaces of an otherwise flat piezoelectric substrate. A pair of input interdigital transducers is located upon one end of the top flat surface of the substrate. A similar pair of output interdigital transducers is located on the bottom flat surface of the substrate at the end opposite the input interdigital transducers. When an input RF spectral signal is applied to the input interdigital transducers, the transducers convert the electrical signal spectrum to a surface acoustic wave spectrum. When the surface acoustic wave spectrum strikes the corrugations cut into the top surface of the substrate, the corrugations selectively scatter certain spectral components into bulk vibration. The bulk vibration strikes the similar corrugations located upon the bottom of the substrate and the bulk vibratory energy is efficiently reconverted to surface acoustic vibration which propagates along the bottom surface of the substrate.

Ballato, A.

1985-05-01

257

Sharpening the Teeth of Some Old "Saws"  

ERIC Educational Resources Information Center

The author cautions teachers to avoid erroneous information and myths when teaching geography courses. He gives examples of easily made factual mistakes, legends, and common misconceptions about geographical concepts and data. (AV)

Gritzner, Charles F.

1977-01-01

258

The SawMill multiserver approach  

Microsoft Academic Search

Multiserver systems, operating systems composed from a set of hardware-protected servers, initially generated significant interest in the early 1990's. If a monolithic operating system could be decomposed into a set of servers with well-defined interfaces and well-understood protection mechanisms, then the robustness and configurability of operating systems could be improved significantly. However, initial multiserver systems [4, 14] were hampered by

Alain Gefflaut; Trent Jaeger; Jochen Liedtke; Kevin J. Elphinstone; Volkmar Uhlig; Jonathon E. Tidswell; Luke Deller; Lars Reuther

2000-01-01

259

What Brown saw and you can too  

NASA Astrophysics Data System (ADS)

A discussion of Robert Brown's original observations of particles ejected by pollen of the plant Clarkia pulchella undergoing what is now called Brownian motion is given. We consider the nature of those particles and how he misinterpreted the Airy disk of the smallest particles to be universal organic building blocks. Relevant qualitative and quantitative investigations with a modern microscope and with a "homemade" single lens microscope similar to Brown's are presented.

Pearle, Philip; Collett, Brian; Bart, Kenneth; Bilderback, David; Newman, Dara; Samuels, Scott

2010-12-01

260

Cereal Killers What we saw in 2007  

E-print Network

Hosts Poor Hosts Root lesion nematode bi l Wide host range for P. Wheat Canola Mustard Barley Oat Durum Field Pea Faba Bean Lentil biology neglectus Anhydrobiosis Chickpea Triticale Safflower Flax Wild Oat Barley Oat Field Pea Faba Bean Variety selection Canola Mustard Chickpea Oat Durum Lentil Triticale

Dyer, Bill

261

Effects of D-004, a lipid extract of the fruit of the Cuban royal palm (Roystonea regia) or the lipidosterolic extract of saw palmetto (Serenoa repens) on the sexual activity in male rats: A controlled, experimental study  

PubMed Central

Background: The etiology of benign prostatic hyperplasia (BPH) is not completely understood, but hormonal changes in aging men seem to be pivotal. Dihydrotestosterone, a potent, active metabolite of testosterone, is formed by the enzymatic action of prostate 5?-reductase and causes cell growth and hyperplasia. Consistent with this action, male sexual dysfunction has been clinically documented to be among the drug-related adverse events associated with 5?-reductase inhibitors. The lipidosterolic extract of saw palmetto (LESP) fruit (Serenoa repens) has been used to treat BPH. D-004, a lipid extract of Roystonea regia Royal palm fruit, has been found to prevent prostatic hyperplasia induced by testoste-rone in rodents and to competitively inhibit prostate 5?-reductase activity in vitro. Objective: The purpose of this study was to assess the effects of D-004 and LESP, administered as single or repeated doses, on the sexual activity in male rats. Methods: This controlled, experimental study was conducted at the Pharmacology Department, Centre of Natural Products, National Centre for Scientific Research, Havana City, Cuba. Adult male Wistar rats weighing 250 to 300 g were randomized into 5 groups: 2 groups treated orally with D-004 (400 and 800 mg/kg); 2 groups treated orally with LESP (400 and 800 mg/kg); and 1 control group orally administered a water vehicle. Sexual activity behavior (the number of mounts and intromissions, mount latency, and intromission latency) was assessed during 2 observation periods: 90 minutes after the initial dose and at the end of the 30-day treatment. Latency was defined as time elapsed between the first mount and intromission. Results: A total of 50 rats (mean [SD] age, 10 [3] weeks; mean [SD] weight, 295 [10] g) were included in the experiment. There were no significant difterences in the mean number of mounts, intromissions, mount latency, or intromission latency in the groups treated with single or repeated doses of D-004 or LESP (400 and 800 mg/kg) compared with the controls. There was also no between-group difterence in mating behavior among the active treatment groups. All rats survived up to study completion, with normal behavior (weight gain, food intake, daily observations, without any sign of toxicity). There were no observable adverse events during the study. Conclusions: D-004 and LESP administered as a single dose or repeated doses for 30 days did not significantly affect male rat sexual activity behavior compared with a vehicle control group. PMID:24692784

Fernandez, Lilia C.; Mas, Rosa; Fernandez, Julio; Mendoza, Sarahi; Gamez, Rafael; Pardo, Balia

2008-01-01

262

Congenital Achiasma and See-Saw Nystagmus in VACTERL Syndrome  

E-print Network

achiasma. These findings have not previously been reported in VACTERL. Journal of Neuro-Ophthalmology 2010;30:45­48 doi: 10.1097/WNO.0b013e3181c28fc0 � 2010 by North American Neuro-Ophthalmology Society The formation of Ophthalmology (SP, YJL), Psychology (SD, BAW), and Radiology (NF), Stanford University School of Medicine

Dumoulin, Serge O.

263

Would We Recognize Progress if We Saw It? A Commentary  

ERIC Educational Resources Information Center

Comments on the nature of special education as an enterprise and judgment of its progress are offered. Five independent but necessary and sufficient criteria for judgment of progress in special education for students with emotional or behavioral disorders are suggested. Comments are made on each of the articles in the series, and concluding…

Kauffman, James M.

2008-01-01

264

Temperature and Strain Coefficient of Velocity for Langasite SAW Devices.  

National Technical Information Service (NTIS)

Surface Acoustic Wave sensors on Langasite substrates are being investigated for aerospace applications. Characterization of the Langasite material properties must be performed before sensors can be installed in research vehicles. The coefficients of velo...

G. M. Atkinson, W. C. Wilson

2013-01-01

265

The Sun as you never saw it before  

NASA Astrophysics Data System (ADS)

The remarkable images come from SOHO's visible-light coronagraph LASCO. It masks the intense rays from the Sun's surface in order to reveal the much fainter glow of the solar atmosphere, or corona. Operated with its widest field of view, in its C3 instrument, LASCO's unprecedented sensitivity enables it to see the thin ionized gas of the solar wind out to the edges of the picture, 22 million kilometres from the Sun's surface. Many stars are brighter than the gas, and they create the background scene. The results alter human perceptions of the Sun. Nearly 30 years ago, Apollo photographs of the Earth persuaded everyone of what until then they knew only in theory, that we live on a small planet. Similarly the new imagery shows our motion in orbit around the Sun, and depicts it as one star among - yet close enough to fill the sky emanations that engulf us. For many centuries even astrologers knew that the Sun was in Sagittarius in December and drifting towards the next zodiacal constellation, Capricornus. This was a matter of calculation only, because the Sun's own brightness prevented a direct view of the starfield. The SOHO-LASCO movie makes this elementary point of astronomy a matter of direct observation for the first time. The images are achievable only from a vantage point in space, because the blue glow of the Earth's atmosphere hides the stars during the day. A spacial allocation of observing time, and of data tranmission from the SOHO spacecraft, enabled the LASCO team to obtain large numbers of images over the period 22-28 December 1996. Since then, a sustained effort in image processing, frame by frame, has achieved a result of high technical and aesthetic quality. Only now is the leader of the LASCO team, Guenter Brueckner of the US Naval Research Laboratory, satisfied with the product and ready to authorize its release. "I spend my life examining the Sun," Brueckner says, "but this movie is a special thrill. For a moment I forget the years of effort that went into creating LASCO and SOHO, and leave aside the many points of scientific importance in the images, I am happy to marvel at a new impression of the busy star that gives us life, and which affects our environment in many ways that we are only now beginning to understand." Transatlantic cooperation The Solar and Heliospheric Observatory SOHO is a project of international cooperation between ESA and NASA. ESA and the European aerospace industry built the spacecraft, and NASA launched it on 2 December 1995. Operating 1,500,000 kilometres out on the sunward side of the Earth, near the position called Lagrangian point L1, SOHO has an uninterrupted view of the Sun from an undisturbed vantage point, and a precision of pointing which makes delicate observations possible. SOHO carries 12 sets of instruments provided by scientific teams, each led by a European or an American principal investigator. They study the solar interior by helioseismology, the solar atmosphere seen by ultraviolet and visible light, and the solar wind and energetic particles. There is much transatlantic collaboration within the various teams. Besides the Naval Research Laboratory in Washington, LASCO involves the Max-Planck-Institüt für Aeronomie at Lindau (Germany), the Unversity of Birmingham (England) and Laboratoire d'Astronomie Spatiale at Marseille (France). Sharing LASCO's electronic systems, and many operations and analyses, is SOHO's extreme ultraviolet imager EIT. This is the responsibility of a team led from Orsay (France) and it observes activity in the Sun's hot atmosphere related to the wider events seen by LASCO. Roger Bonnet, who presides over the multinational effort as ESA's Director of Science, shares the enthusiasm for the Christmas movie. "For the first time we see the Sun clearly among the stars, thanks to SOHO and LASCO," Bonnet comments. "Now when we say that the Sun is a typical star, and a key to understanding the whole Universe, that is no longer a theoretical statement but something everyone can see. The quality of the images c

1997-02-01

266

Higher Order Temperature Coefficients of Quartz SAW Oscillators  

Microsoft Academic Search

Summary The paper describes the theoretical study of Temperature Coefficients (T.C.) of the Irst, 2nd and 3rd order of a Rayleigh's surface acoustic wave. For such a calculation, two methods have been used : The first one consists in calculating the wave velocity (and the corresponding frequency of an oscillator) for each temperature. From the frequency temperature characteristics the T.Cs

D. Hauden; M. Michel; J. J. Gagnepain

1978-01-01

267

Weir and Those 'Disproofs' I Saw before Me Neil Tennant  

E-print Network

advantage of advances in technology. For more information regarding JSTOR, please contact support avenues of investigation are that would very quickly put us in a position confidently to be able to assert they are in the case of a psycho- logical report. One is better placed to see in advance what the general shape

Tennant, Neil

268

Acoustic loss mechanisms in leaky SAW resonators on lithium tantalate.  

PubMed

We discuss acoustic losses in synchronous leaky surface acoustic wave (LSAW) resonators on rotated Y-cut lithium tantalate (LiTaO3) substrates. Laser probe measurements and theoretical models are employed to identify and characterize the radiation of leaky waves into the busbars of the resonator and the excitation of bulk acoustic waves. Escaping LSAWs lead to a significant increase in the conductance, typically occurring in the vicinity of the resonance and in the stopband, but they do not explain the experimentally observed deterioration of the electrical response at the antiresonance. At frequencies above the stop-band, the generation of fast shear bulk acoustic waves is the dominant loss mechanism. PMID:11800113

Koskela, J; Knuuttila, J V; Makkonen, T; Plessky, V P; Salomaa, M M

2001-11-01

269

Temperature and Strain Coefficient of Velocity for Langasite SAW Devices  

NASA Technical Reports Server (NTRS)

Surface Acoustic Wave sensors on Langasite substrates are being investigated for aerospace applications. Characterization of the Langasite material properties must be performed before sensors can be installed in research vehicles. The coefficients of velocity for both strain and temperature have been determined. These values have also been used to perform temperature compensation of the strain measurements.

Wilson, W. C.; Atkinson, G. M.

2013-01-01

270

The Income Volatility See-Saw: Implications for School Lunch  

Microsoft Academic Search

Income volatility challenges the effectiveness of the safety net that USDA food assistance programs provide low-income families. This study examines income volatility among households with children and the implications of volatility for eligibility in the National School Lunch Program (NSLP). The results show that income volatility was higher for successively lower income groups and that the major determinants of changes

Constance Newman

2006-01-01

271

An eye for vulgarity : how MoMA saw color through Wild Bill's lens  

E-print Network

This thesis is an examination of the 1976 Museum of Modern Art exhibition of color photographs by William Eggleston-the second one-man show of color photography in the museum's history- with particular attention to the ...

Kivlan, Anna Karrer

2007-01-01

272

The woman sawed in half: Death, duality, and the female figure of postmodern psychodrama  

Microsoft Academic Search

This study explores female duality in postmodern cinema. Research focuses on suspense plots: seven movies and one television series are analyzed while more productions (1980 to 2000) are surveyed. Productions covered include A Kiss Before Dying (Dearden), In Dreams (Jordan), The Cell (Tarsem), Eye of the Beholder (Elliott), Map of the Human Heart (Ward), The Piano (Campion), Heavenly Creatures (Jackson),

Bonnie Kaitlin Hanger

2001-01-01

273

Utility Theory for Evaluation of Optimal Process Condition of SAW: A Multi-Response Optimization Approach  

SciTech Connect

Multi-objective optimization problem has been solved in order to estimate an optimal process environment consisting of optimal parametric combination to achieve desired quality indicators (related to bead geometry) of submerged arc weld of mild steel. The quality indicators selected in the study were bead height, penetration depth, bead width and percentage dilution. Taguchi method followed by utility concept has been adopted to evaluate the optimal process condition achieving multiple objective requirements of the desired quality weld.

Datta, Saurav [Department of Mechanical Engineering, National Institute of Technology, Rourkela, Orissa-769008 (India); Biswas, Ajay; Bhaumik, Swapan [Department of Mechanical Engineering, National Institute of Technology, Agartala, Barjala, Tripura (W), Pin-799055 (India); Majumdar, Gautam [Department of Mechanical Engineering, Jadavpur University, Raja S. C. Mallik Road, Kolkata-700032 (India)

2011-01-17

274

TO HAVE A SAY AND A SAW: IS DECENTRALIZATION GOOD FOR THE FOREST?  

Microsoft Academic Search

Decentralization outcomes vary with the limitations of the local government mandate, its compatibility with the central government's macroeconomic policies, and the performance of local institutions. We suggest that the way decentralization affects conservation efforts depends on how local institutions mediate the influence of structural drivers of environmental change. We test the mediation hypothesis by comparing the decentralized forestry-sector performance in

Krister P. Andersson; Clark C. Gibson

275

Iwent to the library and I saw an astronomy book. I looked at it...I  

E-print Network

. Many scholars, like Fuentes, first notice their enthusiasm for a specific field during childhood.asu.edu/node/1146 Kip Hodges: The Scientist as Storyteller Watch the video: humanities.asu.edu/node/962 SESE Source

Rhoads, James

276

78 FR 31897 - Agency Information Collection Activities; Proposed Collection; Comment Request; CPSC Table Saw...  

Federal Register 2010, 2011, 2012, 2013

...new modular blade guard. Because the usage patterns are directly linked to the safety...participate in the follow-up, full-scale Computer Assisted Telephone Interviewing (CATI) survey about their usage of, and opinions about, the...

2013-05-28

277

I saw it for longer than you: The relationship between perceived encoding duration and memory conformity  

Microsoft Academic Search

The memory conformity effect is when people’s memories become similar to one another’s following a discussion. The present study examined whether an individual’s beliefs in the quality of their memory, relative to another person’s, mediates susceptibility to memory conformity. Perceived encoding duration was manipulated by telling dyad members that one person had encoded a set of pictures for either half

Fiona Gabbert; Amina Memon; Daniel B. Wright

2007-01-01

278

Lead delamination correlation with Sn layer melting during sawing in power QFN package  

Microsoft Academic Search

Many of the semiconductor components used extensively in today's industrial and multimedia market are beginning to migrate from traditional leaded frame designs to non-leaded QFN designs. This packaging method of map molded could reduce thermal resistance, less size for packaging & weight, suitable for medium or small pads IC with high speed & high frequency applications for products. This map

L. Vigneswaran; Chong Chooi Mei

2010-01-01

279

NASA Lewis Helps Develop Advanced Saw Blades for the Lumber Industry  

NASA Technical Reports Server (NTRS)

NASA Lewis Research Center's Structures and Material Divisions are centers of excellence in high-temperature alloys for aerospace applications such as advanced aircraft and rocket engines. Lewis' expertise in these fields was enlisted in the development of a new generation of circular sawblades for the lumber industry to use in cutting logs into boards. The U.S. Department of Agriculture's (USDA) Forest Products Laboratory and their supplier had succeeded in developing a thinner sawblade by using a nickel-based alloy, but they needed to reduce excessive warping due to residual stresses. They requested assistance from Lewis' experts, who successfully eliminated the residual stress problem and increased blade strength by over 12 percent. They achieved this by developing an innovative heat treatment based on their knowledge of nickel-based superalloys used in aeropropulsion applications.

1998-01-01

280

'"We Saw Inhumanity Close up." What Is Gained by School Students from Scotland Visiting Auschwitz?  

ERIC Educational Resources Information Center

As the education for citizenship agenda continues to impact on schools in the UK and with the Holocaust Educational Trust (HET) in conjunction with the Scottish Government introducing its Lessons From Auschwitz (LFA) project for students and teachers in Scotland, this article focuses on the Scottish context and investigates the school processes by…

Cowan, Paula; Maitles, Henry

2011-01-01

281

Surface acoustic wave (SAW) directed droplet flow in microfluidics for PDMS devices  

E-print Network

for droplet sorting. Soft lithography using the elastomer polydimethysiloxane (PDMS) enables fabrication magnetic particles while dielectrophoretic techniques exploit a contrast in dielectric constant between of the properties of the objects to be sorted such as dielectric constant or charge because it actuates a bulk fluid

282

A Double notch RF filter architecture for SAW-less GPS receivers  

Microsoft Academic Search

A RF filter architecture is presented in a 130nm BiCMOS process, serving as replacement of the off-chip Surface Acoustic Wave filter in a GPS receiver front-end. The on-chip RF filter achieves a 3dB bandwidth of less than 12MHz at the GPS L1 center frequency of 1575.42 MHz. It exhibits a steep roll-off characteristic resulting in more than 30dB attenuation at

Carsten Barth; Ivan R. Linscott; Umran S. Inan

2011-01-01

283

Introduction `...as the dredge cleared the surface, we saw it full and  

E-print Network

the marine environment because the terrestrial Antarctic fauna is comparatively sparse, whereas the polar the Antarctic, such as Laserson from the Australasian expedition, wrote in their populist travel journals about to the mystery and excitement surrounding the Antarctic continent and helped to fuel the Heroic Age of Antarctic

284

Treatment of envenomation by Echis coloratus (mid-east saw scaled viper): a decision tree.  

PubMed

Envenomation by Echis coloratus causes a transient hemostatic failure. Systemic symptoms, hypotension and evident bleeding are rare, with only one reported fatality. In this paper, we examine the decision to treat victims of Echis coloratus by a specific horse antiserum. The decision model considers the mortality of treated and untreated envenomation, and the side effects of antiserum treatment: fatal anaphylaxis, serum sickness and increased risk of death after a possible repeated exposure to horse antiserum in the future. The results of the analysis are not sensitive to variations in the probability of side effects of antiserum treatment. They are sensitive to variations in the risk of bleeding after envenomation, in the degree of reduction of this risk by antiserum treatment and in the risk of dying after an event of bleeding. Prompt administration of antiserum appears to be the treatment of choice if it reduces the risk of bleeding from 23.6% to 20.3% and if 1.6% or more of the bleeding events are fatal. We conclude that presently available data support antiserum treatment of victims of Echis coloratus who present with hemostatic failure, even though the advantage imparted by this treatment appears to be small. PMID:2683230

Gilon, D; Shalev, O; Benbassat, J

1989-01-01

285

The Year in Review A Summer 2012 saw the opening of Renaissance Remix  

E-print Network

, explored diverse cultures with music, dance, storytelling and art activities. Four were annual celebrations by Brandon Vick. D In October 2012, RPO Principal Pops Conductor Jeff Tyzik treated members of the Director's Centennial, "Images: Musical Impressions of an Art Museum" would have its world premiere at Eastman Theatre

Portman, Douglas

286

1966 -2008 This weekend saw the passing of our former student and  

E-print Network

. With sympathy, John John J. Flynn Chairman and Frick Curator, Division of Paleontology American Museum of Natural History years course in Geology. He was granted the degree of Master of Paleontology in the Institute

287

From the Editor At the beginning of 2010 we saw the tail  

E-print Network

-making process, but it is unclear whether students had any real say. Students activists gave the issue only to fruition. Fewer dorms were open to students this summer, and the Northwest Shuttle was merged with EZRide. Changes to printing are soon to come, as the Institute tests a system that requires students

Ishii, Hiroshi

288

Inertial Clustering of Particles in High-Reynolds-Number Turbulence Ewe Wei Saw,1  

E-print Network

May 2008) We report experimental evidence of spatial clustering of dense particles in homogenous or milk in tea) will soon be stirred and mixed by the random vortices in the turbulence until it attains

Gylfason, Ármann

289

They Saw a Movie: Long-Term Memory for an Extended Audiovisual Narrative  

ERIC Educational Resources Information Center

We measured long-term memory for a narrative film. During the study session, participants watched a 27-min movie episode, without instructions to remember it. During the test session, administered at a delay ranging from 3 h to 9 mo after the study session, long-term memory for the movie was probed using a computerized questionnaire that assessed…

Furman, Orit; Dorfman, Nimrod; Hasson, Uri; Davachi, Lila; Dudai, Yadin

2007-01-01

290

Veni,Vidi, Suffragi I came,I saw,I voted.  

E-print Network

meanings of "respect for women" that Bill Clinton had with "sex." If they do, well, at least our governor to 4. Socially (and fortunately limited by the Bill of Rights), we in the US believe in the tyranny

Filman, Robert E.

291

fresher, more nutritious, and it simply tastes better. Like a bumper sticker I saw  

E-print Network

will become unsustainable. Energy and Food--The energy cost of our American food delivery system is mind-boggling. Consider this: the average piece of food on your table traveled 1,500 miles to get there, and products from% of Americans now farm for a living and ever fewer large- scale producers produce huge yields of one or two

Baltisberger, Jay H.

292

PSAW/MicroSWIS [Microminiature Surface Acoustic Wave (SAW) based Wirelesss Instrumentation System  

NASA Technical Reports Server (NTRS)

This Final Report for the PSAW/MicroSWIS Program is provided in compliance with contract number NAS3-01118. This report documents the overall progress of the program and presents project objectives, work carried out, and results obtained. Program Conceptual Design Package stated the following objectives: To develop a sensor/transceiver network that can support networking operations within spacecraft with sufficient bandwidth so that (1) flight control data, (2) avionics data, (3) payload/experiment data, and (4) prognostic health monitoring sensory information can flow to appropriate locations at frequencies that contain the maximum amount of information content but require minimum interconnect and power: a very high speed, low power, programmable modulation, spread-spectrum radio sensor/transceiver.

Heermann, Doug; Krug, Eric

2004-01-01

293

I Saw the "Real" Father Christmas! Children's Everyday Uses of the Words "Real", "Really", and "Pretend"  

ERIC Educational Resources Information Center

The words "real", "really" and "pretend" are used in developmental research paradigms to reflect both the notions of 'authenticity' (in pretense-reality and appearance-reality research) and 'existence' (in fantasy-reality research). The current study explored whether children also expressed these notions in their everyday uses of "real", "really",…

Bunce, Louise; Harris, Margaret

2008-01-01

294

I never saw that before: A deeper view of video analysis in teacher education  

Microsoft Academic Search

This article presents a method for observation and analysis of video tapes called “deep viewing.” Deep viewing is a method for observation and analysis of visual information through the use of communal talk, pictures, and writing. It offers a framework for analyzing visual information and for building meaning from it. It may be used by educators, preservice teachers, students, artists,

Ann Watts Pailliotet

1995-01-01

295

Animal Intelligence66 Scientific American Presents Iused to tell students that no one ever heard, saw,  

E-print Network

other animals, including a variety of primates, elephants, birds and even dolphins, have been tested Intelligence 67Can Animals Empathize? Let me begin with a point on which Gordon Gallup, Jr., and I agreeAnimal Intelligence66 Scientific American Presents Iused to tell students that no one ever heard

Pylyshyn, Zenon

296

Nobel prize winners saluted Last month saw UEA celebrating the award of  

E-print Network

in Australia (photo: CSIRO) New research reveals information about C02 growth and its uptake by oceans. See. The project will develop outreach work and include a new office at the Forum in Norwich to provide a `one-stop-shop their engagement `profile'. The one-stop-shop at the Forum will provide a city contact point for the public via

Feigon, Brooke

297

Dispatch R303 Visual memory: What do you know about what you saw?  

E-print Network

://biomednet.com/elecref/09609822008R0303 © Current Biology Ltd ISSN 0960-9822 How good is your memory? One line of research starting in clothing, props or even the identity of actors [11]. How can we reconcile excellent performance on picture between two women, even if the clothing or the props change. In support of this idea, there is strong evi

298

SMALLTOOTH SAWFISHScienti c Name: Pristis pectinata Why Are They Called Saw sh?  

E-print Network

. Bycatch: Bycatch is a word that is used for a marine animal that is caught accidentally while fishing for something else. Marine Trash (also called marine debris): Is human-created waste (i.e., trash and garbage: Are fish of the class Chondrichthyes, characterized by a cartilaginous skeleton and placoid scales

Watson, Craig A.

299

Properties of biological and biochemical effects of the Iranian saw-scaled viper (Echis carinatus) venom.  

PubMed

The venom of Echis carinatus is rich in proteins and peptides effective on the hemostatic system. This venom is contains metalloproteinase which convert prothrombin to meizothrombin. The prothrombin activator which leads to the formation of small blood clots inside the blood vessels throughout the body. To understand the mechanism of the effects of Iranian Echis carinatus venom, the effects of E. carinatus on human and Wistar rat plasma, plasma proteins (prothrombin and fibrinogen) and blood coagulation were studied. Proteolytic activity of the crude venom on blood coagulation factors such as prothrombin, partial thromboplastin and fibrinogen times were studied. In the present study the PT test for human plasma was reduced from 13.4 s (±0.59) to 8.6 s (±0.64) when human plasma was treated with crude venom (concentration of venom was 1 mg/ml) and for rat plasma PT was reduced from 14.5 s (±0.47) to 8 s (±0.49). Some possible biological and biochemical effects of IEc crude venom were investigated. The blood coagulation in human and in rat were investigated in vivo and in-vitro. In this paper, we show that the procoagulant action of Echis carinatus venom is due in part to a protein component that activates prothrombin and the procoagulant activity on human and rat plasma was evaluated (Tab. 2, Fig. 2, Ref. 31). PMID:25077367

Babaie, M; Salmanizadeh, H; Zolfagharian, H; Alizadeh, H

2014-01-01

300

The microstructural properties of sputtered zinc oxide SAW transducers F. S. Hickernell  

E-print Network

that of the single crystal material. Various aspects of thin-film ZnO process technology have been summarized film de ZnO est analysée par diffraction X, profilométrie de surface et microscopie électronique à different levels of transducer efficiency. The ZnO film micro- structure was analysed using X

Paris-Sud XI, Université de

301

Optimum leaky-SAW cut of LiTaO3 for minimised insertion loss devices  

Microsoft Academic Search

The paper describes how the propagation loss ? of leaky surface acoustic wave (LSAW) is dependent upon the Al thickness h of grating electrodes and rotation angle ? for rotated Y-X LiTaO3. Since the energy leak of LSAW originates from the coupling of the slow-shear field component with other components through the surface boundary conditions, zero ? can be realised

Ken-ya Hashimoto; Masatsune Yamaguchi; S. Mineyoshi; O. Kawachi; M. Ueda; G. Endoh

1997-01-01

302

SAW filters based on parallel-connected coupled resonator filters with offset frequencies.  

PubMed

The concept of coupled resonators is applied to synthesize surface acoustic wave filters. Employing two parallel-connected filter tracks, with a frequency shift imposed between them, a wide passband with low insertion loss together with well-controlled rejections is achieved. The operation of the two-track device is based on the mutual interaction of the individual transfer functions for the pair of tracks. Each track serves to contribute a part of the passband, enabling a wide band. Outside of the passband, the signals passing through the two channels may cancel each other, thus facilitating efficient control over the rejections. However, obtaining rejection stopbands at just the predetermined frequencies requires precise values for the materials parameters and a reliable fabrication process. Prototype devices fabricated with this approach are demonstrated both on quartz and, for the first time, on 42 degrees-LiTaO3. Results for two-track devices having either two or three transducers per track and operating either single-ended or with a balanced output are presented. The devices are designed employing the coupling-of-modes model and transmission-matrix approach, and the separate tracks are optimized simultaneously and independently. The center frequencies are 868 MHz and 1960 MHz. On quartz, a minimum insertion loss of 4 dB and a passband width of 0.23% are achieved at 868 MHz. On 42 degrees-LiTaO3, the corresponding figures of merit are 1.3 dB for minimum insertion loss and 4.1% bandwidth at 1960 MHz. The filters on 42 degrees-LiTaO3 also have remarkably flat passbands. PMID:17225811

Meltaus, Johanna; Plessky, Victor P; Härmä, Sanna; Salomaa, Martti M

2007-01-01

303

The “intelligent tire” utilizing passive SAW sensors measurement of tire friction  

Microsoft Academic Search

The term “intelligent tire” describes tires equipped with sensor systems to monitor thermal and mechanical parameters while driving. Information about temperature, tire pressure, tread wear, etc., is collected and used for car operation and maintenance support. The contact between tire and road surface is a key parameter when characterizing the ability to accelerate, decelerate and steer a vehicle, therefore making

Alfred Pohl; Reinhard Steindl; Leonhard Reindl

1999-01-01

304

As the Europeans Saw Them: The Aleuts of the Eighteenth Century, Social Studies Unit, Book II.  

ERIC Educational Resources Information Center

This booklet is intended for use as reading material for the social studies unit, The Aleuts of the Eighteenth Century. Excerpts from journals of seven 18th-century explorers or travelers describe the inhabitants of the Aleutian Islands. The accounts have been translated from original notes kept by members of the Russian navy, ship commanders, a…

Partnow, Patricia H., Comp.

305

The Income Volatility See-Saw: Implications for School Lunch. Economic Research Report Number 23  

ERIC Educational Resources Information Center

Income volatility challenges the effectiveness of the safety net that USDA food assistance programs provide low-income families. This study examines income volatility among households with children and the implications of volatility for eligibility in the National School Lunch Program (NSLP). The results show that income volatility was higher for…

Newman, Constance

2006-01-01

306

Versatile materials for use as chemically sensitive interfaces in SAW-based sensor arrays  

SciTech Connect

The primary research objective of the work described here is to design, synthesize, and characterize new materials for use as chemical sensor interfaces, integrate these materials, using appropriate transducers, into sensor arrays, and then develop appropriate mathematical algorithms for interpreting the array response. In this paper, we will discuss two new types of materials we have developed that are ideally suited for use as chemically sensitive interfaces for array-based chemical sensing applications, since they: (1) provide general specificity towards classes of functional groups rather than individual compounds; (2) are intermediate in structure between monolayers and polymers; (3) exhibit both endo- and exo-recognition. The first class of materials is surface-confined dendrimers and the second is hyperbranched polymers.

Crooks, R.M.; Bergbrieter, D.E.; Bruening, M.L.; Wells, M.; Zhou, Yuefen [Texas A and M Univ., College Station, TX (United States). Dept. of Chemistry; Ricco, A.J.; Osbourn, G.C. [Sandia National Labs., Albuquerque, NM (United States)

1996-07-01

307

Measuring coupling forces woodcutters exert on saws in real working conditions.  

PubMed

Prolonged exposure to hand-arm vibration (HAV) generated by chainsaws can cause HAV syndrome, i.e., disorders in the upper extremities of forestry workers. Progress of HAV syndrome depends on the intensity of mechanical vibration transmitted throughout the body, which is directly proportional to coupling forces applied by the woodcutter to a vibrating tool. This study aimed to establish a method of measuring coupling forces exerted by chainsaw workers in real working conditions. Coupling forces exerted by workers with their right and left hands were measured with a hydro-electronic force meter. Wood hardness, the type of chainsaw and the kind of forest operation, i.e., felling, cross-cutting or limbing, were considered. PMID:22429531

Malinowska-Borowska, Jolanta; Harazin, Barbara; Zieli?ski, Grzegorz

2012-01-01

308

SH-mode SAW and its acousto-optic interaction in KNbO3  

Microsoft Academic Search

The pure SH (shear horizontal) mode surface acoustic wave on rotated Y-cuts about the Z-axis of potassium niobate (KNbO3) is theoretically analyzed. The results show that there exists a pure SH-mode surface wave, which has a velocity lower than the piezoelectrically inactive Rayleigh wave for most of the rotated cuts. The particle displacement of the SH-mode surface wave on Y-cut

K. Nakamura; M. Oshiki; H. Kitazume

1998-01-01

309

76 FR 75504 - Table Saw Blade Contact Injuries; Notice of Extension of Time for Comments  

Federal Register 2010, 2011, 2012, 2013

...with approximately 90 percent of the injuries occurring to the fingers and hands, and 10 percent of the injuries resulting in amputation...injury; 19. Studies, research, or data that validates human finger proxies for skin-to-blade tests; 20. Studies,...

2011-12-02

310

Equations for Total, Wood, and Saw-Log Volume for Thirteen California Hardwoods.  

National Technical Information Service (NTIS)

Volume equations for thirteen species of California hardwoods were developed from measurements of 766 sample trees from all parts of the state. The species included: bigleaf maple(Acer macrophyllum), Pacific madrone(Arbutus menziesii), giant chinkapin(Cas...

N. H. Pillsbury, M. L. Kirkley

1984-01-01

311

What the Butler Saw: Lee Daniels's Studies in Biography and History  

ERIC Educational Resources Information Center

The movie "Lee Daniels' The Butler" is an example of a work that is meant not only to entertain but to convey an important attitude and offer important viewpoints. The movie deals with a deep issue in the history of movies and the history of the country: racial inequality. Three issues are discussed in this article: (a) African…

Beck, Bernard

2014-01-01

312

For Catholics in Goa the 1960s were a critical period as it saw not just the changes wrought  

E-print Network

and Luso-Indian was acceptable, even if contested, subsequent to the 60s these identities were definitely, but as a result of a variety of interventions in the socio-political. Not least among these is that of religion

313

Liability for malfunction of medical expert systems—why an expert system is like a power saw (abstract only)  

Microsoft Academic Search

With the pervasive presence of computers has come a variety of legal questions arising from the use of this technology. Although a number of these have been addressed both by commentators and the courts, one area has so far received little attention: liability for misdiagnosis by a computerized expert system. We adopt the view that because of the nature of

Elizabeth S. Adams; Mary W. Gray

1987-01-01

314

Onset and decay of the 1+1 Hawking-Unruh effect: what the derivative-coupling detector saw  

E-print Network

We study an Unruh-DeWitt particle detector that is coupled to the proper time derivative of a real scalar field in 1+1 spacetime dimensions. Working within first-order perturbation theory, we cast the transition probability into a regulator-free form, and we show that the transition rate remains well defined in the limit of sharp switching. The detector is insensitive to the infrared ambiguity when the field becomes massless, and we verify explicitly the regularity of the massless limit for a static detector in Minkowski half-space. We then consider a massless field for two scenarios of interest for the Hawking-Unruh effect: an inertial detector in Minkowski spacetime with an exponentially receding mirror, and an inertial detector in $(1+1)$-dimensional Schwarzschild spacetime, in the Hartle-Hawking-Israel and Unruh vacua. In the mirror spacetime the transition rate traces the onset of an energy flux from the mirror, with the expected Planckian late time asymptotics. In the Schwarzschild spacetime the transition rate of a detector that falls in from infinity gradually loses thermality, diverging near the singularity proportionally to $r^{-3/2}$.

Benito A. Juárez-Aubry; Jorma Louko

2014-06-10

315

Population increases have not slowed down; Colorado saw even greater growth in 2001 and 2002. What is new  

E-print Network

. What is new is where many Coloradans are opting to live. Many are choosing to live outside urban areas, wildlife habitat, and traditional farming and ranching communities. They also can affect long-term property

316

The Legal See-Saw: The Rights of the Sex Offender v. The Perception of a Safe Community  

Microsoft Academic Search

The question of how to safely deal with convicted sex offenders upon release from incarceration has been an ongoing hotly-debated topic within American society for decades, with one of the earliest approaches to dealing with these criminals dating back to the 1930s (Petrunik 486). Although it is universally acknowledged that sex crimes are deemed wrong from both the criminal and

Brittany E Kane

2009-01-01

317

Onset and decay of the 1 + 1 Hawking–Unruh effect: what the derivative-coupling detector saw  

NASA Astrophysics Data System (ADS)

We study an Unruh–DeWitt particle detector that is coupled to the proper time derivative of a real scalar field in 1 + 1 spacetime dimensions. Working within first-order perturbation theory, we cast the transition probability into a regulator-free form, and we show that the transition rate remains well defined in the limit of sharp switching. The detector is insensitive to the infrared ambiguity when the field becomes massless, and we verify explicitly the regularity of the massless limit for a static detector in Minkowski half-space. We then consider a massless field for two scenarios of interest for the Hawking–Unruh effect: an inertial detector in Minkowski spacetime with an exponentially receding mirror, and an inertial detector in (1+1)-dimensional Schwarzschild spacetime, in the Hartle–Hawking–Israel and Unruh vacua. In the mirror spacetime the transition rate traces the onset of an energy flux from the mirror, with the expected Planckian late time asymptotics. In the Schwarzschild spacetime the transition rate of a detector that falls in from infinity gradually loses thermality, diverging near the singularity proportionally to {{r}-3/2}.

Juárez-Aubry, Benito A.; Louko, Jorma

2014-12-01

318

The dna 󪩧saw puzzle??ructure model: the case studies of the rice and yeast genomes  

E-print Network

dataset analysis of both fundamental function elements and genes with different functions using statistical tools, we tested the window sizes of 500 kb and 1000 kb [7]. To determine the appropriate window size for 11 the yeast dataset analysis... genome and individual chromosomes by Chi-square Goodness-of-Fit Test. The null hypothesis was that each of the elements was distributed randomly. Since consistent results were obtained from the datasets of both windows (500- and 1000-kb) analyzed...

Liu, Yun-Hua

2009-05-15

319

They Know I Saw It: Evaluation Apprehension and Diffusion of Responsibility in Bystander Reactions to a Violent Crime.  

ERIC Educational Resources Information Center

Male and female bystanders witnessed a violent theft in the course of a bogus "ESP Experiment." In addition to the subjects' sex, two experimental manipulations were orthogonally crossed. The subject was either the only one to witness the emergency, or witnessed it with an additional participant (diffusion of responsibility), and the subject's…

Gottlieb, Avi; Schwartz, Shalom H.

320

Hybrid method for the precise calculation of the general dyadic Greens functions for SAW and leaky wave substrates.  

SciTech Connect

Recently, the generalized method for calculation of the 16-element Green's function for analysis of surface acoustic waves has proven crucial to develop more sophisticated transducers. The generalized Green's function provides a precise relationship between the acoustic stresses and electric displacement on the three mechanical displacements and electric potential. This generalized method is able to account for mass loading effects which is absent in the effective permittivity approach. However, the calculation is numerically intensive and may lead to numerical instabilities when solving for both the eigenvalues and eigenvectors simultaneously. In this work, the general eigenvalue problem was modified to eliminate the numerical instabilities in the solving procedure. An algorithm is also presented to select the proper eigenvalues rapidly to facilitate analysis for all types of acoustic propagation. The 4 x 4 Green's functions and effective permittivities were calculated for materials supporting Rayleigh, leaky, and leaky longitudinal waves as demonstration of the method.

Branch, Darren W.

2008-05-01

321

APPLICATION 2: NOUN PHRASE COREFERENCE In Chapter 4, we saw how cop-kmeans performed much better than the reg-  

E-print Network

[the world]'s [first artificial Earth satellite], [Sputnik I], on [October 4], [1957]. Mars the Red Planet its that nation the Soviet Union Sputnik I first artificial Earth satellite Figure 5.1: An excerpt

Wagstaff, Kiri L.

322

Report of the Northeast Regional Stock Assessment Workshop (39th SAW). Assessment Summary Report and Assessment Report.  

National Technical Information Service (NTIS)

The 39th Stock Assessment Review Committee (SARC) was convened in Woods Hole, at the Northeast Fishery Science Center, June 7-10, 2004, to review assessments of black sea bass, sea scallops and bluefish. The basis for review were detailed assessment repor...

2004-01-01

323

Real-time monitoring of calcium carbonate and cationic peptide deposition on carboxylate-SAM using a microfluidic SAW biosensor  

PubMed Central

Summary A microfluidic biosensor with surface acoustic wave technology was used in this study to monitor the interaction of calcium carbonate with standard carboxylate self-assembled monolayer sensor chips. Different fluids, with and without biomolecular components, were investigated. The pH-dependent surface interactions of two bio-inspired cationic peptides, AS8 and ES9, which are similar to an extracellular domain of the chitin synthase involved in mollusc shell formation, were also investigated in a biological buffer system. A range of experimental conditions are described that are suitable to study non-covalent molecular interactions in the presence of ionic substances, such as, mineral precursors below the solubility equilibrium. The peptide ES9, equal to the mollusc chitin synthase epitope, is less sensitive to changes in pH than its counterpart AS8 with a penta-lysine core, which lacks the flanking acidic residues. This study demonstrates the extraordinary potential of microfluidic surface acoustic wave biosensors to significantly expand our experimental capabilities for studying the principles underlying biomineralization in vitro. PMID:25383294

Pohl, Anna

2014-01-01

324

A novel method of fabricating ZnO\\/diamond\\/Si multilayers for surface acoustic wave (SAW) device applications  

Microsoft Academic Search

A novel process for fabricating ZnO\\/diamond\\/Si for a surface acoustic wave device is as follows: to form a trench of 10 ?m in depth, the Si wafer is chemically etched by employing the SiO2 layer as a mask. Selective growth of polycrystalline diamond film is carried out by a microwave plasma CVD using nominal conditions of 700 W microwave power,

Soo-Hyung Seo; Wan-Chul Shin; Jin-Seok Park

2002-01-01

325

Guided shear-horizontal surface acoustic wave (SH-SAW) chemical sensors for detection of organic contaminants in aqueous environments  

Microsoft Academic Search

With the growing concern of the threat of the use of (bio) chemical weapons, and the ever-present environmental pollution, acoustic wave sensors attract considerable attention for the detection of various (bio) chemical compounds due to the need for real-time, stable and direct detection in aqueous environments. In this work, direct chemical sensing in liquid environments using polymer-guided shear horizontal surface

Zhonghui Li

2005-01-01

326

The twentieth century saw art move from the canvas to the computer. Digital technology earned the status of  

E-print Network

and computer gaming are the two most common forms of digital art that have captured the atten- tion of people in and outside of the artistic community. The influence of computer-generated art on society awaits in means much more than computer animation and virtual reality games. Penny championed the computational

Danforth, Bryan Nicholas

327

SASOL SciFest saw the start of a very productive science communication rally, where 8 FABI  

E-print Network

. On a more light-hearted note, there was great audience participation and interaction with the "Mushroom on the dangers that are associated with the great varieties of mushrooms. Dialogue centered on the tasty treats made from mushrooms and the amazing, if not weird, dishes that can be prepared using mushrooms. "Do you

328

PUBLISHED ONLINE: 5 DECEMBER 2010 | DOI: 10.1038/NGEO1026 Expression of the bipolar see-saw in Antarctic  

E-print Network

2 , C. Ritz2 , C. Scarchilli3 , A. Schilt7 , S. Schüpbach7 , J. Schwander7 , E. Selmo10 , M. Severi9 (Antarctic Isotopic Maximum AIM1; ref. 1) followed by an interruption towards cooler conditions during

Chappellaz, Jérôme

329

“I’d Know a False Confession if I Saw One”: A Comparative Study of College Students and Police Investigators  

Microsoft Academic Search

College students and police investigators watched or listened to 10 prison inmates confessing to crimes. Half the confessions were true accounts; half were false—concocted for the study. Consistent with much recent research, students were generally more accurate than police, and accuracy rates were higher among those presented with audiotaped than videotaped confessions. In addition, investigators were significantly more confident in

Saul M. Kassin; Christian A. Meissner; Rebecca J. Norwick

2005-01-01

330

When was the last time you saw an isosurface with error bars or streamlines with standard devia-  

E-print Network

ago when neuro- surgeons and radiologists used one of our volume ren- derings of the brain the difference? Clearly, if it's important to represent error and uncertainty in 2D graphs, then it's equally important to represent error and uncertainty in 2D and 3D visualization. The possible detriment caused

Utah, University of

331

Real-time monitoring of calcium carbonate and cationic peptide deposition on carboxylate-SAM using a microfluidic SAW biosensor.  

PubMed

A microfluidic biosensor with surface acoustic wave technology was used in this study to monitor the interaction of calcium carbonate with standard carboxylate self-assembled monolayer sensor chips. Different fluids, with and without biomolecular components, were investigated. The pH-dependent surface interactions of two bio-inspired cationic peptides, AS8 and ES9, which are similar to an extracellular domain of the chitin synthase involved in mollusc shell formation, were also investigated in a biological buffer system. A range of experimental conditions are described that are suitable to study non-covalent molecular interactions in the presence of ionic substances, such as, mineral precursors below the solubility equilibrium. The peptide ES9, equal to the mollusc chitin synthase epitope, is less sensitive to changes in pH than its counterpart AS8 with a penta-lysine core, which lacks the flanking acidic residues. This study demonstrates the extraordinary potential of microfluidic surface acoustic wave biosensors to significantly expand our experimental capabilities for studying the principles underlying biomineralization in vitro. PMID:25383294

Pohl, Anna; Weiss, Ingrid M

2014-01-01

332

FEM simulation of Rayleigh waves for CMOS compatible SAW devices based on AlN/SiO?/Si(100).  

PubMed

A simulation study of Rayleigh wave devices based on a stacked AlN/SiO?/Si(100) device was carried out. Dispersion curves with respect to acoustic phase velocity, reflectivity and electromechanical coupling efficiency for tungsten W and aluminium Al electrodes and different layer thicknesses were quantified by 2D FEM COMSOL simulations. Simulated acoustic mode shapes are presented. The impact of these parameters on the observed Rayleigh wave modes was discussed. High coupling factors of 2% and high velocities up to 5000 m/s were obtained by optimizing the AlN/SiO? thickness ratio. PMID:23684473

Kaletta, Udo Christian; Wenger, Christian

2014-01-01

333

SAW\\/LSAW COM parameter extraction from computer experiments with harmonic admittance of a periodic array of electrodes  

Microsoft Academic Search

A novel numerical method for determining the surface acoustic wave and the leaky surface acoustic wave characteristics is proposed. The Green's function method is used to simulate an infinite periodic transducer driven by a periodic voltage. We show that the coupling of modes parameters and the dispersion relation can be extracted from the change in the admittance as the periodicity

Julius Koskela; Victor P. Plessky; Martti M. Salomaa

1999-01-01

334

2010 Growing Conditions This year saw excellent corn growing conditions in much of the state. Where 2009 had featured below  

E-print Network

as an estimate of hybrid efficiency. Hybrids that show high yields and earlier maturity (lower grain moistures are all based on rating scales. Early Vigor was evaluated at knee-high stage or a bit earlier, with 6 disease apparent). CV, LSD, SD We use three statistics to evaluate the quality of the data from

Pawlowski, Wojtek

335

6 Nonlinear Algebraic Systems We saw earlier that the implementation of implicit IVP solvers often requires the so-  

E-print Network

a Newton-Raphson or modified Newton- Raphson method (see below). 2. Even for non-stiff problems it may a Newton-Raphson method. 75 #12;6.2 Newton-Raphson Iteration In order to see how Newton-Raphson iteration[i] - I - g z (z[i] ) -1 z[i] - g(z[i] ) , i = 0, 1, . . . , (54) which is known as the Newton-Raphson

Fasshauer, Greg

336

Inhibition of Inflammatory Gene Expression in Keratinocytes Using a Composition Containing Carnitine, Thioctic Acid and Saw Palmetto Extract  

PubMed Central

Chronic inflammation of the hair follicle (HF) is considered a contributing factor in the pathogenesis of androgenetic alopecia (AGA). Previously, we clinically tested liposterolic extract of Serenoa repens (LSESr) and its glycoside, ?-sitosterol, in subjects with AGA and showed a highly positive response to treatment. In this study, we sought to determine whether blockade of inflammation using a composition containing LSESr as well as two anti-inflammatory agents (carnitine and thioctic acid) could alter the expression of molecular markers of inflammation in a well-established in vitro system. Using a well-validated assay representative of HF keratinocytes, specifically, stimulation of cultured human keratinocyte cells in vitro, we measured changes in gene expression of a spectrum of well-known inflammatory markers. Lipopolysaccharide (LPS) provided an inflammatory stimulus. In particular, we found that the composition effectively suppressed LPS-activated gene expression of chemokines, including CCL17, CXCL6 and LTB(4) associated with pathways involved in inflammation and apoptosis. Our data support the hypothesis that the test compound exhibits anti-inflammatory characteristics in a well-established in vitro assay representing HF keratinocyte gene expression. These findings suggest that 5-alpha reductase inhibitors combined with blockade of inflammatory processes could represent a novel two-pronged approach in the treatment of AGA with improved efficacy over current modalities. PMID:19692448

Chittur, Sridar; Parr, Brian; Marcovici, Geno

2011-01-01

337

Optimal cut for leaky SAW on LiTaO3 for high performance resonators and filters  

Microsoft Academic Search

The paper describes how the characteristics of leaky surface acoustic wave (LSAW) propagation depend on the thickness of Al grating electrodes on rotated Y-X LiTaO3. It is shown that the propagation loss arising from leaky nature changes parabolically with both the grating electrode thickness and rotation angle and becomes zero when electrode thickness and rotation angle are properly determined. This

Osamu Kawachi; Seiji Mineyoshi; Gou Endoh; Masanori Ueda; Osamu Ikata; E. Hashimoto; Masatsune Yamaguchi

2001-01-01

338

Characteristics of leaky SAWs on 36-LiTaO3 in periodic structures of heavy electrodes  

Microsoft Academic Search

Experimental data is presented on leaky surface wave propagation on 36-LiTaO3 with gold and platinum electrodes having a thickness up to 0.04?. Such heavy electrodes induce a very strong mechanical perturbation of the surface such that very large reflection coefficients are obtained. Reflection coefficients greater than 50% per wavelength (that is per 2 electrodes) and corresponding stopbands (up to 17%

Victor P. Plessky; Clinton S. Hartmann

1993-01-01

339

Optimal cut for leaky SAW on LiTaO3 for high performance resonators and filters.  

PubMed

The paper describes how the characteristics of leaky surface acoustic wave (LSAW) propagation depend on the thickness of Al grating electrodes on rotated Y-X LiTaO3. It is shown that the propagation loss arising from leaky nature changes parabolically with both the grating electrode thickness and rotation angle and becomes zero when electrode thickness and rotation angle are properly determined. This means that even when thick grating electrodes are needed in device design, zero propagation loss is always realized by properly determining the rotation angle. When the grating electrode thickness is 0.07 to 0.1 in wavelength for example, LSAWs on 40-42 degrees Y-X LiTaO3 give zero propagation loss without deteriorating other characteristics. Ladder-type filters for the 800-MHz range were fabricated, which essentially need thick Al grating electrodes of about 0.1 wavelength thickness. As predicted by theoretical calculation, experimental results showed that if the rotation angle is increased to circa 420 from a conventional value of 36 degrees, the insertion loss and shape factor are markedly improved compared with devices based on 36 degrees Y-X LiTaO3. This is essentially a result of the minimized propagation loss. PMID:11570771

Kawachi, O; Mineyoshi, S; Endoh, G; Uedo, M; Ikata, O; Hashimoto, K Y; Yamaguchi, M

2001-09-01

340

A Retrospective and Prospective on Technology in Education: The "Saw-Tooth Curve" and the Process of Change.  

ERIC Educational Resources Information Center

Discusses educational theory development noting that, as theories become too complex, they are replaced by simpler ones. Future educational theories may relate intellectual performance to physical performance, develop student attention, or relate relaxation techniques to self-image. (RAO)

Tuckman, Bruce W.

1980-01-01

341

"Such a smoking nation as this I never saw...": smoking, nationalism, and manliness in nineteenth-century Hungary.  

PubMed

Tobacco smoking became an important marker of Hungarian national identity during the nineteenth century. this national symbol ultimately had an economic origin: Hungarian tobacco producers resisted the tobacco monopoly of the Habsburg central government, and led an ultimately successful consumer boycott of Austrian products. Tobacco nationalism, however, became a common theme in Hungarian popular culture in its own right, as tobacco use came to symbolize community and fraternity. The use of tobacco was also highly gendered; smoking as a metaphor for membership shows that the Hungarian nation was a gender-exclusive "national brotherhood." PMID:20058399

Maxwell, Alexander

2006-01-01

342

A see-saw of pre-Columbian boom regions in southern Peru, determined by large-scale circulation changes  

NASA Astrophysics Data System (ADS)

Environmental changes and cultural transitions during several periods of Peruvian history show a strong coincidence between humid and dry climatic oscillations and the rise and decline of cultures. It is noteworthy, that alternating periods of geo-ecological fragility and stability occurred in time and space between the coastal Nasca region (14.5° S) and the high Andean northern Titicaca basin, just a few hundred kilometers to the east. Based on a multi-proxy palynological and sedimentological approach to reconstruct palaeoenvironmental changes, we found that the Nasca region received a maximum of precipitation during the archaeological boom times of the Early Horizon and the Early Intermediate Period (800 BC - 650 AD, Paracas and Nasca cultures) as well as during the late intermediate period (1150-1450 AD), whereas, in contrast, the Titicaca region further to the south-east experienced drought and cultural depression during that times. During the Middle Horizon (650 - 1150 AD), the Tiwanaku agronomy and culture boomed in the Titicaca region and expanded to the west, contemporaneous with a raised lake level and more humid conditions. In the Nasca region, runoff for irrigation purposes was reduced and less reliable due to drought. Considering a coincidence between environmental and cultural changes, we state that success and decline of civilizations were controlled by hydrological oscillations, triggering fertility as well as a critical loss of natural resources. In response to spatial changing resources, cultural foci were shifted. Therefore, the success of pre-Columbian civilizations was closely coupled to areas of geo-ecological favorability, which were directly controlled by distinct regional impacts of large-scale circulation mechanisms, including El Niño - Southern Oscillation (ENSO). Changes in the position of the intertropical convergence zone (ITCZ) and the Bolivian anticyclone determined meridional shifts in moisture transport across the Andes, which directly triggered human migration to the respective granaries.

Mächtle, B.; Schittek, K.; Forbriger, M.; Schäbitz, F.; Eitel, B.

2012-04-01

343

"I Just Saw It as Something that Would Pull You Down, Rather than Lift You Up": Resilience in Never-Smokers with Mental Illness  

ERIC Educational Resources Information Center

Self ConceptWhy people smoke despite the health risks is an important public health question. Equally important is why and how some people resist smoking in spite of circumstances that clearly place them at high risk of becoming smokers. This study used in-depth interviews to explore the narratives of 12 people diagnosed with mental illness, who…

Lawn, Sharon; Hersh, Deborah; Ward, Paul R.; Tsourtos, George; Muller, Robert; Winefield, Anthony; Coveney, John

2011-01-01

344

BROWNIAN MOTION OF AEROSOL PARTICLES 415 We saw in Section 9.3 that for t , the particle velocity relaxes to a pseudo-  

E-print Network

that for particles that are larger than the mean free path of air, Cc 1 and their diffusivity varies as D-1 p p. Diffusion coefficients for particles ranging from 0.001 to 10.0 µm diameter in air at 20°C by Brownian #12;BROWNIAN MOTION OF AEROSOL PARTICLES 417 FIGURE 9.8 Aerosol diffusion coefficients in air

Russell, Lynn

345

Jitter-Tolerance and Blocker-Tolerance of Delta-Sigma Analog-to-Digital Converters for Saw-Less Multi-Standard Receivers  

E-print Network

to investigate the sensitivities of CT ?? ADCs to out-of-band (OOB) blockers and find the design considerations and solutions needed to maintain the performance of CT ?? modulators in presence of OOB blockers. Also, CT ?? modulators suffer from a critical...

Ahmed, Ramy 1981-

2012-12-05

346

Seismic event distributions and off-fault damage during frictional sliding of saw-cut surfaces with pre-defined roughness  

NASA Astrophysics Data System (ADS)

The motion along upper crustal faults in response to tectonic loading is controlled by both loading stresses and surface properties, for example, roughness. Fault roughness influences earthquake slip distributions, stress-drops and possible transitions from stable to unstable sliding which is connected to the radiation of seismic energy. The relationship between fault roughness and seismic event distributions is insufficiently understood, in particular, the underlying mechanisms of off-fault seismicity creation in the proximity of rough faults are debated. Here, we investigate the connection between roughness and acoustic emission (AE) density with increasing fault-normal distance during loading of surfaces with pre-defined roughness. We test the influence of fault roughness and normal stress variations on the characteristics of AE off-fault distributions. To this end, two sets of experiments were conducted: one to investigate the influence of initial surface roughness at constant confining pressure, and the other to investigate the influence of fault-normal stresses at constant roughness. Our experiments reveal a power-law decay of AE density with distance from the slip surface. The power-law exponents are sensitive to both fault roughness and normal stress variations so that larger normal stresses and increased roughness lead to slower AE density decay with fault-normal distance. This emphasizes that both roughness and stress have to be considered when trying to understand microseismic event distributions in the proximity of fault zones. Our results are largely in agreement with theoretical studies and observations of across-fault seismicity distributions in California suggesting a connection between off-fault seismicity and fault roughness over a wide range of scales. Seismicity analysis including a possible mapping between off-fault activity exponents, fault stresses and roughness, can be an important tool in understanding the mechanics of faults and their seismic hazard potential.

Goebel, T. H. W.; Candela, T.; Sammis, C. G.; Becker, T. W.; Dresen, G.; Schorlemmer, D.

2014-01-01

347

Neutralisation of Local Haemorrhage Induced by the Saw-Scaled Viper Echis carinatus sochureki Venom Using Ethanolic Extract of Hibiscus aethiopicus L.  

PubMed Central

The objective of the study is to investigate the anti-snake venom activities of a local plant, Hibiscus aethiopicus L. The H. aethiopicus was dried and extracted with ethanol. Different assays were performed according to standard techniques, to evaluate the plant's acute toxicity and its antivenom activities. The results of evaluating the systemic acute toxicity of the H. aethiopicus extract using “oral and intra-peritoneal” route were normal even at the highest dose (24?g/kg) tested. All guinea pigs (n = 3) when treated with venoms E. c. sochureki (75??g) alone induced acute skin haemorrhage. In contrast, all guinea pigs (n = 18) treated with both venom and the plant extract at a concentration between 500 and 1000?mg/kg showed no signs of haemorrhage. Moreover, all guinea pigs (n = 18) treated with venom and the plant extract below 400?mg/kg showed acute skin haemorrhage. All guinea pigs treated with venom E. c. sochureki (75??g) alone induced acute skin haemorrhage after both 24 and 32 hours. In contrast, all guinea pigs treated with both venom and the plant extract (administered independently) at concentrations between 500 and 1000?mg/kg showed no signs of haemorrhage after 32 hours. However, after 24 hours all tested guinea pigs showed less inhibition (<60%) compared to that obtained after 32 hours. The outcome of this study reflects that the extract of H. aethiopicus plant may contain an endogenous inhibitor of venom induced local haemorrhage. PMID:22666294

Hasson, S. S.; Al-Balushi, M. S.; Said, E. A.; Habbal, O.; Idris, M. A.; Mothana, R. A. A.; Sallam, T. A.; Al-Jabri, A. A.

2012-01-01

348

Effect of micro-plasma arc melting on the corrosion resistance of a 0Cr19Ni9 stainless steel SAW joint  

Microsoft Academic Search

The surface microstructure and the anodic polarization curves in a 1 N H2SO4 solution of a 0Cr19Ni9 submerged arc welded joint were studied before and after surface melting using a 4-A micro-plasma arc. The results showed that both the heat-affected zone and the weld metal of the as-welded joint had a lower corrosion resistance than the as-received parent material, while

W Luo

2002-01-01

349

Forced response of cylindrical shells coupled with nonlinear shape-memory-alloy (SMA) actuators regulated by sinusoidal and saw-tooth temperature profiles  

Microsoft Academic Search

Dynamic responses of cylindrical shells coupled with shape-memory alloy (SMA) ring segments placed at critical locations are\\u000a investigated. Since the SMA actuators are highly nonlinear and governed by the temperate-dependent stiffness and martensite\\/austenite\\u000a fraction, input shaping and phase shift of temperature profiles are incorporated to control the shell vibrations. Open-loop\\u000a equations of an elastic cylindrical shell panel are defined first

J. G. DeHaven; H. S. Tzou

2008-01-01

350

How to get in and out of the skull: from tumi to "hammer and chisel" to the Gigli saw and the osteoplastic flap.  

PubMed

Making "holes in the skull" is an ancient art and by some is considered the second oldest profession in the world-the first being prostitution. Early surgeons, and later on neurosurgeons, devised a number of ingenious ways to make a hole in the skull or elevate a depressed skull fracture. Trephined skulls from antiquity have now been found in most parts of world, showing that the art of trephining is not only ancient but clearly widespread. Beginning with antiquity the author traces the development of this surgical skill by reviewing the various tools used and surgical designs to perform what is now called a craniotomy. PMID:24708162

Goodrich, James Tait

2014-04-01

351

MSK SAW tapped delay lines on LiTaO3 with moderate processing gain for CDMA indoor and mobile radio applications  

Microsoft Academic Search

We report on the design and performance of two SAM MSK Tapped Delay Lines (TDLs) using PN code sequences of length 128 chips, As a substrate, LiTaO3 has been used due to the system requirements of a given CDMA\\/TDMA system. Center frequency, bandwidth of the major lobe, and integration time were 266.66 MHz, 65.7 MHz, and 3 ?s, respectively. TDL

R. Weigell; C. Knorr; K. C. Wagner; L. Reindl; F. Seifert

1995-01-01

352

ESRP 285 Climate Chart Questions: Your Name _______________________________ You saw Figure 1 in class. It shows estimates of atmospheric CO2 in black, average earth  

E-print Network

in class. It shows estimates of atmospheric CO2 in black, average earth temperature in red and sea level be much higher than normal every 100,000 yrs #12;5. Figure 1 shows the average earth temperature interval, his ideas cannot explain the 5ºC increase in temperature at the end of each ice age. Taken alone

Ford, Andrew

353

"I Saw the Madre": Evaluating Predictions about Codeswitched Determiner-Noun Sequences Using Spanish-English and Welsh-English Data  

ERIC Educational Resources Information Center

Previous work on intrasentential codeswitching has noted that switches between determiners and their noun complements are frequent in both Spanish-English and Welsh-English data. Two major recent theories of codeswitching, the Matrix Language Frame model and a Minimalist Program approach, make potentially competing predictions regarding the source…

Herring, Jon Russell; Deuchar, Margaret; Couto, M. Carmen Parafita; Quintanilla, Monica Moro

2010-01-01

354

Geochemical assessment of the contaminant potential of granite fines produced during sawing and related processes associated to the dimension stone industry  

Microsoft Academic Search

Granite fines are inorganic wastes produced in the elaboration of dimension stone. Because of the increasing development of that industry in NW Spain, some concerns related to their classification as type of waste and their environmental impact have been raised. We have performed a detailed physicochemical, mineralogical and geomechanical characterization of the fines and the results make up the basis

J. Delgado; A. Vázquez; R. Juncosa; V. Barrientos

2006-01-01

355

In 2006 hIstory buffs celebrated the 200th anniversary of the moment when explorer Zebulon Pike first saw the mountain that would later bear his name.  

E-print Network

encounters o n e Bonnie J. Clark and Laura L. Scheiber A Sloping Land: An Introduction to Archaeological that will be discussed in the pages to come. Landscape perspectives in archaeology focus on the relationships and inter it their home. It is cattle country, cowboy country, Indian country. It is also an area rich in ethnographic

Scheiber, Laura L.

356

Hindu nationalism and History of Science: some reflexions Agathe Keller, Laboratoire Sphere, ERC-SAW project, CNRS-Universit Paris 7, Paris, France  

E-print Network

through Hinduism (which may be thought as a culture or a religion) against all the part of the indian the mark of their time in their will to modernise a revived and reinvented Hinduism with a mix of socialist analyzing quite in detail Breivik's manifesto's relation to Hinduism with a tinge of irony1. These articles

Boyer, Edmond

357

CHILD LABOR LAWS Texas Workforce Commission  

E-print Network

saws, band saws and guillotine shears, abrasive cutting discs, reciprocating saws, chain saws and wood, punching, and shearing machines. (9) in connection with mining, other than coal. (10) *operating

Rock, Chris

358

77 FR 38173 - Child Labor Regulations, Orders and Statements of Interpretation  

Federal Register 2010, 2011, 2012, 2013

...the operation of circular saws, band saws, guillotine shears, chain saws, reciprocating saws, wood chippers, and abrasive cutting discs (Order 14). [FR Doc. 2012-15868 Filed 6-26-12; 8:45 am] BILLING CODE...

2012-06-27

359

From Th e F ield Mediating Medical Malpractice Lawsuits Against Hospitals: New York City's Pilot Project All participants saw the value of mediation in reaching acceptable outcomes for patients and health care providers  

Microsoft Academic Search

The New York City Health and Hospitals Corporation participated in a feasibil- ity study to measure the participants' satisfaction with mediation of medical malpractice lawsuits. Twenty-nine cases were referred to the study, twenty-four agreed to mediation, and nineteen were mediated. Satisfaction data indicate that the plaintiffs and their attor- neys and the defendant's attorney were satisfied with the process whether

Chris Stern Hyman; Clyde B. Schechter

360

On December 26, 2004 the world saw yet again how strains built up over hundreds of years by slow and almost imperceptible motions of tectonic plates are released with devastating effect. A  

E-print Network

and almost imperceptible motions of tectonic plates are released with devastating effect. A giant earthquake the Tibetan plateau. The plate collision continues today as the In- dian plate moves northward, forcing pieces The Earth Scientist Fig. 1a. Approximate plate tectonic bounda- ries in the region of the Sumatra earthquake

Stein, Seth

361

About the Issue: Elective Delivery Prior to 39 Weeks of Gestation Between 1990 and 2006, the United States saw a 50% increase in deliveries at 37 to 38 weeks of  

E-print Network

://www.marchofdimes.com/pregnancy/getready_atleast39weeks.html National Child and Maternal Health Education Program (NCMHEP). (no date). National Child and Maternal Health Education Program (NCMHEP) continuing medical education (CME) course: Raising awareness

Rau, Don C.

362

UCPD Crime Alert Update: Arrests Made in Recent Robbery On 5/18/13 at 4:50pm a UCPD officer on patrol in the area of Rustin Ave. and the Sports Complex, saw a  

E-print Network

UCPD Crime Alert Update: Arrests Made in Recent Robbery On 5/18/13 at 4:50pm a UCPD officer description in the robbery noted in the Crime Alert below sent on 5/17/13. UCPD officers stopped the vehicle in the area. Original Alert: UCPD Crime Alert- Cell Phone Taken from Victim at the Summer Meadows Apartments

363

Variable depth core sampler  

DOEpatents

A variable depth core sampler apparatus is described comprising a first circular hole saw member, having longitudinal sections that collapses to form a point and capture a sample, and a second circular hole saw member residing inside said first hole saw member to support the longitudinal sections of said first hole saw member and prevent them from collapsing to form a point. The second hole saw member may be raised and lowered inside said first hole saw member. 7 figs.

Bourgeois, P.M.; Reger, R.J.

1996-02-20

364

Variable depth core sampler  

DOEpatents

A variable depth core sampler apparatus comprising a first circular hole saw member, having longitudinal sections that collapses to form a point and capture a sample, and a second circular hole saw member residing inside said first hole saw member to support the longitudinal sections of said first hole saw member and prevent them from collapsing to form a point. The second hole saw member may be raised and lowered inside said first hole saw member.

Bourgeois, Peter M. (Hamburg, NY); Reger, Robert J. (Grand Island, NY)

1996-01-01

365

PM 9-1 Page 1 of 16 July 18, 2013 CALIFORNIA INSTITUTE OF TECHNOLOGY  

E-print Network

materials; 4. operation of power driven wood working machines, circular saws, band saws, guillotine shears, chain saws, reciprocating saws, wood chippers, and abrasive cutting discs; 5. operation of power driven, punching, and shearing machines; #12;PM 9-1 Page 2 of 16 July 18, 2013 7. work performed in or about boiler

Faraon, Andrei

366

Forest-based Algorithms in Natural Language Processing  

E-print Network

) and Kevin Knight (USC/ISI) Dissertation Defense September 18th, 2008 #12;NLP is all about ambiguities 2 I saw her duck. #12;NLP is all about ambiguities 2 I saw her duck. #12;NLP is all about ambiguities · how about... · I saw her duck with a telescope. 2 I saw her duck. #12;NLP is all about ambiguities

Plotkin, Joshua B.

367

Novel method for photovoltaic energy conversion using surface acoustic waves in piezoelectric semiconductors  

Microsoft Academic Search

This paper presents a novel principle for photovoltaic (PV) energy conversion using surface acoustic waves (SAWs) in piezoelectric semiconductors. A SAW produces a periodically modulated electric potential, which spatially segregates photoexcited electrons and holes to the maxima and minima of the SAW potential. The moving SAW collectively transports the carriers with the speed of sound to the electrodes made of

Victor M. Yakovenko

2009-01-01

368

High-Efficiency Photovoltaic Energy Conversion using Surface Acoustic Waves in Piezoelectric Semiconductors  

Microsoft Academic Search

We propose a radically new design for photovoltaic energy conversion using surface acoustic waves (SAWs) in piezoelectric semiconductors. The periodically modulated electric field from SAW spatially separates photogenerated electrons and holes to the maxima and minima of SAW, thus preventing their recombination. The segregated electrons and holes are transported by the moving SAW to the collecting electrodes of two types,

Victor Yakovenko

2010-01-01

369

Highly efficient photovoltaic energy conversion using surface acoustic waves in piezoelectric semiconductors  

Microsoft Academic Search

We present a theoretical proposal for a novel principle for photovoltaic\\u000aenergy conversion using surface acoustic waves (SAWs). A SAW produces periodic\\u000amodulation of the electric potential in a piezoelectric semiconductor. The\\u000aphotoexcited electron and holes are separated to the maxima and minima of the\\u000aSAW potential in a large volume occupied by the SAW. The moving SAW transports\\u000athe

Victor M. Yakovenko; Matthew Grayson; H. Dennis Drew

2009-01-01

370

Microfluidic pumping through miniaturized channels driven by ultra-high frequency surface acoustic waves  

NASA Astrophysics Data System (ADS)

Surface acoustic waves (SAWs) are an effective means to pump fluids through microchannel arrays within fully portable systems. The SAW-driven acoustic counterflow pumping process relies on a cascade phenomenon consisting of SAW transmission through the microchannel, SAW-driven fluid atomization, and subsequent coalescence. Here, we investigate miniaturization of device design, and study both SAW transmission through microchannels and the onset of SAW-driven atomization up to the ultra-high-frequency regime. Within the frequency range from 47.8 MHz to 754 MHz, we show that the acoustic power required to initiate SAW atomization remains constant, while transmission through microchannels is most effective when the channel widths w ? 10 ?, where ? is the SAW wavelength. By exploiting the enhanced SAW transmission through narrower channels at ultra-high frequencies, we discuss the relevant frequency-dependent length scales and demonstrate the scaling down of internal flow patterns and discuss their impact on device miniaturization strategies.

Shilton, Richie J.; Travagliati, Marco; Beltram, Fabio; Cecchini, Marco

2014-08-01

371

Liquid-Phase Sensor Using Shear Horizontal Surface Acoustic Wave Devices  

NASA Astrophysics Data System (ADS)

A surface acoustic wave (SAW) is perturbed from physical and/or chemical changes of an adjacent medium. If a liquid-phase sensor is realized, a shear horizontal SAW (SH-SAW) must be used. The SH-SAW sensors been investigated since 1987. Measuring objects of the SH-SAW sensor are not only immunoreactions but also liquid properties. Feature of the SH-SAW sensor is simultaneous detection of mechanical and electrical properties of liquid. In this paper, first, theory of the SH-SAW sensor is described. Then experimental results using the SH-SAW sensor on 36YX-LiTaO3 are introduced. Also, the sensor sensitivities of the SH-SAW sensors which are fabricated on piezoelectric substrates are theoretically compared.

Kondoh, Jun

372

Homemade Games… how to make and play.  

E-print Network

the sawed end. Remove the sawed material with a chisel or rip saw. Drill a hole in the center of the axle. Screw the axle to the end -- of the broomstick so that the top of axle is flush with the square surface of the end of the broomstick. Screw... the sawed end. Remove the sawed material with a chisel or rip saw. Drill a hole in the center of the axle. Screw the axle to the end -- of the broomstick so that the top of axle is flush with the square surface of the end of the broomstick. Screw...

Moore, Lucille H.; Johnson, Eloise T.

1957-01-01

373

Anisotropic effects in surface acoustic wave propagation from a point source in a crystal  

NASA Astrophysics Data System (ADS)

Strong anisotropic effects in the propagation of surface acoustic waves (SAWs) from a point-like source are studied experimentally and theoretically. Nanosecond SAW pulses are generated by focused laser pulses and detected with a cw probe laser beam at a large distance from the source compared to the SAW wavelength, which allows us to resolve fine intricate features in SAW wavefronts. In our theoretical model, we represent the laser excitation by a localized impulsive force acting on the sample surface and calculate the far-field surface response of an elastically anisotropic solid to such a force. The model simulates the measured SAW waveforms very well and accounts for all experimentally observed features. Using the data obtained for the (111) and (001) surfaces of GaAs, we describe a variety of effects encountered in the SAW propagation from a point source in crystals. The most interesting phenomenon is the existence of cuspidal structures in SAW wavefronts resulting in multiple SAW arrivals for certain ranges of the observation angle. Cuspidal edges correspond to the “phonon focusing” directions yielding sharp peaks in the SAW amplitude. A finite SAW wavelength results in “internal diffraction” whereby the SAW wavefront spreads beyond the group velocity cusps. Degeneration of a SAW into a transverse bulk wave is another strong effect influencing the anisotropy of the SAW amplitude and making whole sections of the SAW wavefront including some phonon focusing directions unobservable in the experiment. The propagation of a leaky SAW mode (pseudo-SAW) is affected by a specific additional effect i.e. anisotropic attenuation. We also demonstrate that many of the discussed features are reproduced in “powder patterns”, a simple technique developed by us earlier for visualization of SAW amplitude anisotropy.

Maznev, A. A.; Lomonosov, A. M.; Hess, P.; Kolomenskii, Al. A.

2003-10-01

374

"+" before English name indicates a non-species taxon * Four-letter and six-letter codes that, because of conflicts, are not "1st-order" codes are marked with asterisks. See Pyle and  

E-print Network

Western Grebe WEGR Aechmophorus occidentalis AECOCC Northern Saw-whet Owl NSWO Aegolius acadicus AEGACA Boreal Owl BOOW Aegolius funereus AEGFUN Unspotted Saw-whet Owl USWO Aegolius ridgwayi AEGRID Mariana

DeSante, David F.

375

Kinetic Monte Carlo simulation of titin unfolding Dmitrii E. Makarova)  

E-print Network

of a domain in the protein. There are many saw-teeth because the protein has many domains. We will call. The saw-tooth graphs obtained by repeating the experi- ment are not identical: the unfolding times

Fygenson, Deborah Kuchnir

376

Mission Science Common Supplies Request Advisor______________________________ School________________________  

E-print Network

Tape, masking Wire, insulated Wire, magnet #12;Mission Science Tools Request Advisor Hack saw Hand saw Hot glue gun Pliers Scissors Soldering Iron Wire strippers Xacto knife #12;Mission Science Supplies or tools Request Advisor______________________________ School

Wang, Hai

377

Development of a Shear Horizontal Surface Acoustic Wave Sensor System for Liquids with a Floating Electrode Unidirectional Transducer  

NASA Astrophysics Data System (ADS)

The development of sensors using surface acoustic wave (SAW) devices has been attracting attention. A shear horizontal SAW (SH-SAW) sensor can detect the properties and chemical reactions in liquids. To realize practical applications of the SAW sensor, it is necessary to discuss its properties. In this paper, SH-SAW sensors with a floating electrode unidirectional transducer (FEUDT) or an interdigital transducer (IDT) are compared and the insertion loss and phase characteristics are measured. Also, the phase shift between sample and reference liquids is evaluated. The results indicate that the SH-SAW sensor with the FEUDT is suitable for liquid measurements. The SH-SAW sensor with the FEUDT is then mounted in a newly developed SH-SAW sensing system. The system configuration is the same as that of a vector voltmeter measurement system. However, circuits have been developed that reduce its size. Using this system, several liquids are measured. The obtained results agree well with the theoretical values.

Kondoh, Jun; Okiyama, Yusuke; Mikuni, Satoru; Matsui, Yoshikazu; Nara, Makoto; Mori, Toshimasa; Yatsuda, Hiromi

2008-05-01

378

Parade Float Construction 101  

E-print Network

to locate a variety of tools. Here are a few you might want to plan for: a table saw or circular saw, saber. This superstructure will generally be used to #12;support chicken wire, cardboard or other light decorating items

Moore, Paul A.

379

Single crystal growth of KNbO 3 and application to surface acoustic wave devices  

Microsoft Academic Search

Potassium niobate (KNbO3) has large piezoelectric constants. The surface acoustic wave (SAW) substrates with high couplings are very important for wide-band SAW filters and SAW devices. Therefore, the large size KNbO3 single crystals are required for SAW device applications. In this paper, the techniques of a large size of KNbO3 using the top seeded solution growth techniques (TSSG) with large

Kazuhiko Yamanouchi; Yasuo Wagatsuma; Hiroyuki Odagawa; Yasuo Cho

2001-01-01

380

Novel sensor combining impedance spectroscopy and surface acoustic waves to detect blood coagulation time and hematocrit value  

Microsoft Academic Search

In this paper a new tool simultaneously to detect viscoelastic and dielectric properties of human fluids is presented. Therefore, one-port SAW resonators (SAW … surface acoustic wave) with fundamental modes of 85, 170 und 340 MHz were developed. Shear horizontal polarized surface acoustic waves (SH-SAW) are used to detect the viscoelastic properties of coagulating blood and blood plasma samples. The

G. Guhr; R. Brunig; H. Schmidt; M. Weihnacht; S. Gehrisch; G. Siegert

2011-01-01

381

Year of last Year of last  

E-print Network

Dogfish Spiny Dogfish 2003 2003 Stock Assessment Workshop (SAW) Summer Flounder/Scup/Black Sea Bass Summer Flounder 2003 2002 Stock Assessment Workshop (SAW) Working Group Summer Flounder/Scup/Black Sea Bass Scup 2002 2001 Stock Assessment Workshop (SAW) Summer Flounder/Scup/Black Sea Bass Black Sea Bass 1998 1997

382

Stainless steel submerged arc weld fusion line toughness  

Microsoft Academic Search

This effort evaluated the fracture toughness of austenitic steel submerged-arc weld (SAW) fusion lines. The incentive was to explain why cracks grow into the fusion line in many pipe tests conducted with cracks initially centered in SAWS. The concern was that the fusion line may have a lower toughness than the SAW. It was found that the fusion line, Ji.

A. R. Rosenfield; P. R. Held; G. M. Wilkowski

1995-01-01

383

Wirelessly interrogable surface acoustic wave sensors for vehicular applications  

Microsoft Academic Search

Wirelessly interrogated passive surface acoustic wave (SAW) sensors for measurements in a rough environment are shown. These can be applied when remote readout is necessary and other sensors cannot withstand heat, dirt, mechanical vibration, and\\/or electromagnetic interference. Applications of passive SAW sensors for sensing tasks, especially in vehicles are discussed. The implementation of SAW sensors for measurements of torque and

Alfred Pohl; Franz Seifert

1997-01-01

384

Theoretical and experimental study of surface acoustic wave substrates with super high couplings  

Microsoft Academic Search

The properties of SAW device mainly depend on the choice of piezoelectric substrate materials. The important properties required for SAW substrates are large electromechanical coupling coefficient (k2 ), small temperature coefficient of delay (TCD), low propagation loss, etc. Especially, super high coupling substrates are very important for fabricating the wideband SAW filters, wideband VCO and delay lines with small insertion

K. Yamanouchi; H. Odagawa

2000-01-01

385

30 CFR 57.14116 - Hand-held power tools.  

Code of Federal Regulations, 2011 CFR

...and circular and chain saws, when used in the hand-held mode shall be operated with controls which require constant hand or finger pressure. (b) Circular saws and chain saws shall not be equipped with devices which lock-on the operating...

2011-07-01

386

29 CFR 1928.57 - Guarding of farm field equipment, farmstead equipment, and cotton gins.  

Code of Federal Regulations, 2010 CFR

...which have doors giving access to the saws shall be guarded by fixed barrier guards or their equivalent which prevent direct finger or hand contact with the saws while the saws are in motion. (iii) An interlock shall be installed on all balers so...

2010-07-01

387

High-efficiency photovoltaic energy conversion using surface acoustic waves in piezoelectric semiconductors  

Microsoft Academic Search

We present a theoretical proposal for a radically new design for photovoltaic energy conversion using surface acoustic waves (SAWs) in piezoelectric semiconductors. It involves generation of SAWs, which create a periodically modulated electric field in a pure (undoped) piezoelectric semiconductor. This electric field spatially separates photogenerated electrons and holes to the maxima and minima of SAW, thus preventing their recombinatio.

Victor M. Yakovenko

2009-01-01

388

A hierarchical approach for one-dimensional cutting stock problems in the steel industry that maximizes yield and minimizes overgrading  

Microsoft Academic Search

In the steel industry, as hot steel products exit the producing facility, they are cut at primary saws (hotsaws) into shorter pieces. After these pieces cool, they are inspected for defects and either applied directly to customer orders or are further cut to ordered lengths at secondary saws (cold saws). In this case study, we will describe a hierarchical algorithm,

Francis J. Vasko; Dennis D. Newhart

1999-01-01

389

Modeling of a Surface Acoustic Wave Strain Sensor  

NASA Technical Reports Server (NTRS)

NASA Langley Research Center is investigating Surface Acoustic Wave (SAW) sensor technology for harsh environments aimed at aerospace applications. To aid in development of sensors a model of a SAW strain sensor has been developed. The new model extends the modified matrix method to include the response of Orthogonal Frequency Coded (OFC) reflectors and the response of SAW devices to strain. These results show that the model accurately captures the strain response of a SAW sensor on a Langasite substrate. The results of the model of a SAW Strain Sensor on Langasite are presented

Wilson, W. C.; Atkinson, Gary M.

2010-01-01

390

Enhancement of acoustic streaming induced flow on a focused surface acoustic wave device: Implications for biosensing and microfluidics  

NASA Astrophysics Data System (ADS)

Fluid motion induced on the surface of 100 MHz focused surface acoustic wave (F-SAW) devices with concentric interdigital transducers (IDTs) based on Y-cut Z-propagating LiNbO3 substrate was investigated using three-dimensional bidirectionally coupled finite element fluid-structure interaction models. Acoustic streaming velocity fields and induced forces for the F-SAW device are compared with those for a SAW device with uniform IDTs (conventional SAW). Both, qualitative and quantitative differences in the simulation derived functional parameters, such as device displacements amplitudes, fluid velocity, and streaming forces, are observed between the F-SAW and conventional SAW device. While the conventional SAW shows maximum fluid recirculation near input IDTs, the region of maximum recirculation is concentrated near the focal point of the F-SAW device. Our simulation results also indicate acoustic energy focusing by the F-SAW device leading to maximized device surface displacements, fluid velocity, and streaming forces near the focal point located in the center of the delay path, in contrast to the conventional SAW exhibiting maximized values of these parameters near the input IDTs. Significant enhancement in acoustic streaming is observed in the F-SAW device when compared to the conventional ones; the increase in streaming velocities was computed to be 352% and 216% for tangential velocities in propagation and transverse directions, respectively, and 353% for the normal velocity. Consequently, the induced streaming force for F-SAW is 480% larger than that for conventional SAW. In biosensing applications, this allows for the removal of smaller submicron sized particles by F-SAW which are otherwise difficult to remove using the conventional SAW. The F-SAW presents an order of magnitude reduction in the smallest removable particle size compared to the conventional device. Our results indicate that the acoustic energy focusing and streaming enhancement brought about by the F-SAW device manifests itself as enhanced biofouling removal efficiency of F-SAW throughout the device delay path compared to the conventional device, thereby providing enhanced device sensitivity, selectivity, and reusability. Furthermore, contrary to the conventional SAW in which the smallest particle is removable near the input IDTs, the F-SAW device removes the smallest particle near the device focal point. The results of this work are shown to have significant implications in typical biosensing and microfluidic applications. In a broader context, the results of the present study demonstrate a technique of enhancing streaming induced flows, which is of great importance to contemporary problems involving microfluidic and sensing applications of piezoelectric devices.

Singh, Reetu; Sankaranarayanan, Subramanian K. R. S.; Bhethanabotla, Venkat R.

2010-01-01

391

Surface Acoustic Wave Ammonia Sensors Based on ST-cut Quartz under Periodic Al Structure  

PubMed Central

Surface acoustic wave (SAW) devices are key components for sensing applications. SAW propagation under a periodic grating was investigated in this work. The theoretical method used here is the space harmonic method. We also applied the results of SAW propagation studied in this work to design a two-port resonator with an Al grating on ST-cut quartz. The measured frequency responses of the resonator were similar to the simulation ones. Then, the chemical interface of polyaniline/WO3 composites was coated on the SAW sensor for ammonia detection. The SAW sensor responded to ammonia gas and could be regenerated using dry nitrogen. PMID:22399951

Hsu, Cheng-Liang; Shen, Chi-Yen; Tsai, Rume-Tze; Su, Ming-Yau

2009-01-01

392

Reduction of Transverse Surface Acoustic Wave Leakage in Resonator on Al/42° YX-LiTaO3 Substrate for High-Frequency Applications  

NASA Astrophysics Data System (ADS)

In this paper, we propose a new structure for reducing the extent of transverse surface acoustic wave (SAW) leakage for the SAW resonator on a 42° YX-LiTaO3 substrate. Such leakage occurs from the interdigital region toward the busbar region in the SAW resonators. The new structure has a Ta2O5 film outside the interdigital region. This structure can make the SAW velocity in the busbar region lower than the velocity in the interdigital region. Therefore, the new structure could reduce the extent of leakage, and contribute to confine the SAW energy in the interdigital region. This structure was applied in SAW resonators and ladder-type SAW filters fabricated on a 42° YX-LiTaO3 substrate. The insertion loss could be improved by suppressing transverse SAW leakage. This technique could be applied to the fabrication of the filters and duplexers using leaky SAW on a 42° YX-LiTaO3 substrate, and the SAW devices could exhibit excellent performance.

Komatsu, Tomoya; Nakamura, Hiroyuki; Nakanishi, Hidekazu; Turunari, Tetsuya; Fujiwara, Joji

2013-07-01

393

Ray splitting in the reflection and refraction of surface acoustic waves in anisotropic solids.  

PubMed

This paper examines the conditions for, and provides examples of, ray splitting in the reflection and refraction of surface acoustic waves (SAW) in elastically anisotropic solids at straight obstacles such as edges, surface breaking cracks, and interfaces between different solids. The concern here is not with the partial scattering of an incident SAW's energy into bulk waves, but with the occurrence of more than one SAW ray in the reflected and/or transmitted wave fields, by analogy with birefringence in optics and mode conversion of bulk elastic waves at interfaces. SAW ray splitting is dependent on the SAW slowness curve possessing concave regions, which within the constraint of wave vector conservation parallel to the obstacle allows multiple outgoing SAW modes for certain directions of incidence and orientation of obstacle. The existence of pseudo-SAW for a given surface provides a further channel for ray splitting. This paper discusses some typical material configurations for which SAW ray splitting occurs. An example is provided of mode conversion entailing backward reflection or negative refraction. Experimental demonstration of ray splitting in the reflection of a laser generated SAW in GaAs(111) is provided. The calculation of SAW mode conversion amplitudes lies outside the scope of this paper. PMID:21117731

Every, A G; Maznev, A A

2010-05-01

394

Comparison of Transmission Line Methods for Surface Acoustic Wave Modeling  

NASA Technical Reports Server (NTRS)

Surface Acoustic Wave (SAW) technology is low cost, rugged, lightweight, extremely low power and can be used to develop passive wireless sensors. For these reasons, NASA is investigating the use of SAW technology for Integrated Vehicle Health Monitoring (IVHM) of aerospace structures. To facilitate rapid prototyping of passive SAW sensors for aerospace applications, SAW models have been developed. This paper reports on the comparison of three methods of modeling SAWs. The three models are the Impulse Response Method (a first order model), and two second order matrix methods; the conventional matrix approach, and a modified matrix approach that is extended to include internal finger reflections. The second order models are based upon matrices that were originally developed for analyzing microwave circuits using transmission line theory. Results from the models are presented with measured data from devices. Keywords: Surface Acoustic Wave, SAW, transmission line models, Impulse Response Method.

Wilson, William; Atkinson, Gary

2009-01-01

395

Tests of a 200 MHz surface acoustic wave mass monitor in a space environment  

NASA Astrophysics Data System (ADS)

A surface acoustic wave (SAW) crystal has been tested to demonstrate its usefulness in a space environment. The testing was done in a vacuum space chamber. The temperature of the heat sink on which the SAW was supported was varied over the anticipated temperature range that the SAW would be subjected to in space (from 100 C to LN2 temperature). The repeatability of frequency, the stability of the device and the long term drift were important features of the test. An empirical determination of mass sensitivity (mass/frequency change) of the SAW was accomplished by measuring the water-vapor outgassing rate of the chamber walls with not only the SAW but also a 10-MHz QCM with a known mass sensitivity. This test not only measured the mass sensitivity by comparison but it also allowed the measurement of the linearity of the SAW's total dynamic range.

Wallace, Donald A.; Wallace, Scott A.; Bowers, William D.; Chuan, Raymond L.

1990-11-01

396

Confinement of surface acoustic waves in AlN /GaN/?-LiAlO2 acoustic wells  

NASA Astrophysics Data System (ADS)

We numerically investigate the characteristics of surface acoustic waves (SAWs) in AlN /GaN/?-LiAlO2 heterostructures. The markedly large sound velocity in AlN in comparison to that in GaN leads to an expulsion of SAWs from the top AlN layer and their resultant relocation to the middle GaN layer in the short-wavelength regime. The SAW velocity in the limit of zero wavelength is given by a bulk sound velocity of GaN, owing to the capping by the AlN barrier layer. The extra confinement of the SAW power in the acoustic well is advantageous in manipulating the operation of GaN-based devices by SAWs. The threshold velocity for the appearance of guided Rayleigh-like modes is found to be smaller than the bulk transverse sound velocity in the substrate. The present system exhibits furthermore unusual bowing behavior in the SAW dispersion.

Takagaki, Y.; Chilla, E.; Ploog, K. H.

2005-02-01

397

Conformal invariance predictions for the three-dimensional self-avoiding walk  

E-print Network

If the three dimensional self-avoiding walk (SAW) is conformally invariant, then one can compute the hitting densities for the SAW in a half-space and in a sphere. The ensembles of SAW's used to define these hitting densities involve walks of arbitrary lengths, and so these ensembles cannot be directly studied by the pivot Monte Carlo algorithm for the SAW. We show that these mixed length ensembles should have the same scaling limit as certain weighted ensembles that only involve walks with a single length, thus providing a fast method for simulating these ensembles. Preliminary simulations which found good agreement between the predictions and Monte Carlo simulations for the SAW were reported in [14]. In this paper we present more accurate simulations testing the predictions and find even stronger support for the prediction that the SAW is conformally invariant in three dimensions.

Tom Kennedy

2014-08-20

398

Design of heterogeneous catalysts with artificially controllable functions using effects of acoustic wave excitation  

Microsoft Academic Search

The effects of surface acoustic waves (SAWs) and resonance oscillation (RO) of bulk acoustic waves on catalytic activity and selectivity were studied in an attempt to design a heterogeneous catalyst which has artificially controllable functions for chemical reactions. The propagation of Rayleigh SAW and shear horizontal leaky SAW through thin Pd catalyst films deposited on poled ferroelectric LiNbO3 and LiTaO3

Yasunobu Inoue

1999-01-01

399

Optimizing surface acoustic wave sensors for trace chemical detection  

SciTech Connect

This paper describes several recent advances for fabricating coated surface acoustic wave (SAW) sensors for applications requiring trace chemical detection. Specifically, we have demonstrated that high surface area microporous oxides can provide 100-fold improvements in SAW sensor responses compared with more typical polymeric coatings. In addition, we fabricated GaAs SAW devices with frequencies up to 500 MHz to provide greater sensitivity and an ideal substrate for integration with high-frequency electronics.

Frye, G.C.; Kottenstette, R.J.; Heller, E.J. [and others

1997-06-01

400

Research Rate Liaison Rate for outside academic &  

E-print Network

Fischione Low Angle Milling and Polishing Machine 5/sample N/A Diamond Saw (1 hr min) 2 4 High Speed Saw (Struers) 2/cut 10/cut Wire Saw 4/cut 8/cut NanoMill 1040 50/sample 75/sample Rheovibron 2 6 Abrasive for under 150 C 20 DSC404 - Netzsch 10 20 DMA/TMA/DEA 10 20 Flow Calorimetry 5/run 20/run Environmental

Gilchrist, James F.

401

Guided propagation of surface acoustic waves in AlN and GaN films grown on 4H-SiC(0001) substrates  

Microsoft Academic Search

The propagation modes of surface acoustic waves (SAW) in AlN and GaN layers are identified for the case of the acoustic wave being confined in the epitaxial layers by the fast-velocity SiC substrate. Higher-order Rayleigh modes emerge when the SAW wavelength is reduced to be below the layer thickness. We also report on the observation of an extremely-high-velocity SAW mode,

Y. Takagaki; P. V. Santos; E. Wiebicke; O. Brandt; H.-P. Schönherr; K. H. Ploog

2002-01-01

402

Dose-response relation for vascular disorders induced by vibration in the fingers of forestry workers  

Microsoft Academic Search

OBJECTIVES--To study the relation between the prevalence of vascular disorders (white finger) and vibration exposure in a group of 222 forestry workers, of whom 164 (73.9%) had work experience limited to antivibration (AV) chain saws only and 58 (26.1%) had operated both non-AV and AV chain saws. METHODS--The chain saw operators and 195 control workers never exposed to hand transmitted

M Bovenzi; A Franzinelli; R Mancini; M G Cannavà; M Maiorano; F Ceccarelli

1995-01-01

403

Theoretical analysis of horizontal shear mode piezoelectric surface acoustic waves in potassium niobate  

Microsoft Academic Search

The propagation characteristics of the pure SH (horizontal shear) mode piezoelectric surface acoustic wave (SAW) on rotated Y-cuts about the Z-axis of potassium niobate (KNbO3) are theoretically analyzed. The results show that there exists a SH mode SAW which has a velocity lower than the piezoelectrically inactive Rayleigh mode SAW for most of the rotated cuts. Differing from the so-called

Kiyoshi Nakamura; Mitsuhiro Oshiki

1997-01-01

404

Research of SuperHigh Electromechanical Coupling Surface Acoustic Wave Substrates  

Microsoft Academic Search

The properties of surface acoustic wave (SAW) devices mainly depend on the choice of piezoelectric substrate materials. The important properties required for SAW substrates are a large electromechanical coupling coefficient (k2), small temperature coefficient of delay (TCD), and low propagation loss, etc. Especially, super-high coupling substrates are very important for obtaining wide-band SAW filters, wide-band voltage controll oscilater (VCO) and

Kazuhiko Yamanouchi; Hiroyuki Odagawa

2001-01-01

405

Genetic Patterns of Differentiation amonG five LanDbirD sPecies from the Queen charLotte isLanDs, british coLumbia  

E-print Network

--Northern Saw-whet Owl (Aegolius acadicus), Hairy Woodpecker (Picoides villosus), Steller's Jay (Cyanocitta valu quatre espces--Aegolius acadicus, Picoides villosus, Cyanocitta stelleri et Pinicola enucleator

Winker, Kevin

406

Comparison of layered surface acoustic wave transducers with different guiding metal oxide films for immunosensing applications  

NASA Astrophysics Data System (ADS)

Layered Surface Acoustic Wave (SAW)immunosensors based on a substrate crystal cut that allows the propagation of Surface Skimming Bulk Wave (SSBW)have been fabricated. SiO2 and ZnO films with different thicknesses deposited onto the substrate to form the SAW device. The layered SAW device developed is a gravimetric sensor.Upon exposures to solutions containing IgG, the operational frequency of the system incorporating the sensor changes. In this paper, the sensitivity of the SAW devices with different film thicknesses will be compared. Their response to the biochemical components will be investigated.

Kalantar-Zadeh, Kourosh; Chen, Yuen Yuen; Fry, Benjamin N.; Wlodarski, Wojtek; Trinchi, Adrian

2001-11-01

407

Enhanced Sensitivity of Surface Acoustic Wave-Based Rate Sensors Incorporating Metallic Dot Arrays  

PubMed Central

A new surface acoustic wave (SAW)-based rate sensor pattern incorporating metallic dot arrays was developed in this paper. Two parallel SAW delay lines with a reverse direction and an operation frequency of 80 MHz on a same X-112°Y LiTaO3 wafer are fabricated as the feedback of two SAW oscillators, and mixed oscillation frequency was used to characterize the external rotation. To enhance the Coriolis force effect acting on the SAW propagation, a copper (Cu) dot array was deposited along the SAW propagation path of the SAW devices. The approach of partial-wave analysis in layered media was referred to analyze the response mechanisms of the SAW based rate sensor, resulting in determination of the optimal design parameters. To improve the frequency stability of the oscillator, the single phase unidirectional transducers (SPUDTs) and combed transducer were used to form the SAW device to minimize the insertion loss and accomplish the single mode selection, respectively. Excellent long-term (measured in hours) frequency stability of 0.1 ppm/h was obtained. Using the rate table with high precision, the performance of the developed SAW rate sensor was evaluated experimentally; satisfactory detection sensitivity (16.7 Hz·deg·s?1) and good linearity were observed. PMID:24577520

Wang, Wen; Shao, Xiuting; Liu, Xinlu; Liu, Jiuling; He, Shitang

2014-01-01

408

Microfluidic resonant cavities enable acoustophoresis on a disposable superstrate.  

PubMed

We demonstrate surface acoustic wave (SAW) induced microparticle manipulation in a microstructured disposable glass-polymer composite superstrate, positioned on a piezoelectric substrate with a single, slanted SAW transducer. An excited SAW was coupled from the piezoelectric substrate into the superstrate, which acted as a transversal resonator structure. We show that the energy transmitted into the superstrate allowed acoustophoretic particle manipulation, while the wide frequency response of the SAW transducer enabled tuneable pressure distributions confined by the microchannel layout. The configuration provides a significant tolerance in positioning - making assembly easy. PMID:25224539

Witte, C; Reboud, J; Wilson, R; Cooper, J M; Neale, S L

2014-11-01

409

Polymer Coated Surface Acoustic Wave Biosensor for Living Cells  

NASA Astrophysics Data System (ADS)

A shear horizontal surface acoustic wave (SH-SAW) biosensor is fabricated on quartz wafer for measurement of mechanical properties of living cells. The SAW device was fabricated with a top film of polymer (PMMA, SU-8) to avoid immense attenuation in aqueous media. Several models were designed to operate under different frequencies such as 20MHz, 40MHz and 80MHz and higher in order to identify how frequency affect the sensitivity. A network analyzer was used to capture the resonant frequency of inter-digitated transducers (IDT) of SAW, and it is found that resonant frequency shift is closely correlated to the cell deposition on the sensing area of SAW.

Dai, Lian; Zhang, Jianping; Dewilde, Abiche; Wang, Gang; Marx, Kenneth; Braunhut, Susan; Therrien, Joel

2012-02-01

410

SUPERVISOR'S INVESTIGATION OF EMPLOYEE'S ACCIDENT/INCIDENT TWCC (1/02) Appendix A-1 (b), Page 1 of 2  

E-print Network

/disease Driving Sawing Aircraft Eating Searching Air pressure Escorting Securing Animal (snake, dog, horse, etc.) Exercising Sitting Athletic equipment (baseball, bat, dart, etc.) Feeding Standing Attachments (belt, pulley

Gelfond, Michael

411

Surface acoustic wave opto-mechanical oscillator and frequency comb generator.  

PubMed

We report on realization of an efficient triply resonant coupling between two long lived optical modes and a high frequency surface acoustic wave (SAW) mode of the same monolithic crystalline whispering gallery mode resonator. The coupling results in an opto-mechanical oscillation and generation of a monochromatic SAW. A strong nonlinear interaction of this mechanical mode with other equidistant SAW modes leads to mechanical hyperparametric oscillation and generation of a SAW pulse train and associated frequency comb in the resonator. We visualized the comb by observing the modulation of the light escaping the resonator. PMID:21886203

Savchenkov, A A; Matsko, A B; Ilchenko, V S; Seidel, D; Maleki, L

2011-09-01

412

Enhanced sensitivity of surface acoustic wave-based rate sensors incorporating metallic dot arrays.  

PubMed

A new surface acoustic wave (SAW)-based rate sensor pattern incorporating metallic dot arrays was developed in this paper. Two parallel SAW delay lines with a reverse direction and an operation frequency of 80 MHz on a same X-112°Y LiTaO3 wafer are fabricated as the feedback of two SAW oscillators, and mixed oscillation frequency was used to characterize the external rotation. To enhance the Coriolis force effect acting on the SAW propagation, a copper (Cu) dot array was deposited along the SAW propagation path of the SAW devices. The approach of partial-wave analysis in layered media was referred to analyze the response mechanisms of the SAW based rate sensor, resulting in determination of the optimal design parameters. To improve the frequency stability of the oscillator, the single phase unidirectional transducers (SPUDTs) and combed transducer were used to form the SAW device to minimize the insertion loss and accomplish the single mode selection, respectively. Excellent long-term (measured in hours) frequency stability of 0.1 ppm/h was obtained. Using the rate table with high precision, the performance of the developed SAW rate sensor was evaluated experimentally; satisfactory detection sensitivity (16.7 Hz?deg?s(-1)) and good linearity were observed. PMID:24577520

Wang, Wen; Shao, Xiuting; Liu, Xinlu; Liu, Jiuling; He, Shitang

2014-01-01

413

Integrated microfluidics system using surface acoustic wave and electrowetting on dielectrics technology  

PubMed Central

This paper presents integrated microfluidic lab-on-a-chip technology combining surface acoustic wave (SAW) and electro-wetting on dielectric (EWOD). This combination has been designed to provide enhanced microfluidic functionality and the integrated devices have been fabricated using a single mask lithographic process. The integrated technology uses EWOD to guide and precisely position microdroplets which can then be actuated by SAW devices for particle concentration, acoustic streaming, mixing and ejection, as well as for sensing using a shear-horizontal wave SAW device. A SAW induced force has also been employed to enhance the EWOD droplet splitting function. PMID:22662079

Li, Y.; Fu, Y. Q.; Brodie, S. D.; Alghane, M.; Walton, A. J.

2012-01-01

414

X-ray diffraction pattern of a Gulyaev-Bleustein surface acoustic wave in grazing geometry  

SciTech Connect

The X ray diffraction pattern of a Gulyaev-Bleustein surface acoustic wave (SAW) under grazing angles of incidence in noncoplanar symmetric Laue geometry has been considered. It is supposed that the propagation direction of an SAW makes a small angle with the diffraction vector. It is shown that small deviations from the Bragg angle ({approx}0.01'' induced by the SAW and do not affect the reflection coefficient lead to the formation of diffraction satellites both in the cases of standing and traveling SAWs. It has been established that the recorded diffraction pattern, which is a time-averaged intensity distribution, has characteristic profiles for odd and even satellites.

Levonyan, L. V., E-mail: gurgen@iapp.sci.am; Khachaturyan, G. K. [Academy of Sciences of Armenia, Institute of Applied Physics Problems (Armenia)

2006-12-15

415

Object Permanence After a 24-Hr Delay and Leaving the Locale of Disappearance: The Role of Memory, Space, and Identity  

ERIC Educational Resources Information Center

Fourteen-month-old infants saw an object hidden inside a container and were removed from the disappearance locale for 24 hr. Upon their return, they searched correctly for the hidden object, demonstrating object permanence and long-term memory. Control infants who saw no disappearance did not search. In Experiment 2, infants returned to see the…

Moore, M. Keith; Meltzoff, Andrew N.

2004-01-01

416

A novel optimal sensitivity design scheme for yarn tension sensor using surface acoustic wave device.  

PubMed

In this paper, we propose a novel optimal sensitivity design scheme for the yarn tension sensor using surface acoustic wave (SAW) device. In order to obtain the best sensitivity, the regression model between the size of the SAW yarn tension sensor substrate and the sensitivity of the SAW yarn tension sensor was established using the least square method. The model was validated too. Through analyzing the correspondence between the regression function monotonicity and its partial derivative sign, the effect of the SAW yarn tension sensor substrate size on the sensitivity of the SAW yarn tension sensor was investigated. Based on the regression model, a linear programming model was established to gain the optimal sensitivity of the SAW yarn tension sensor. The linear programming result shows that the maximum sensitivity will be achieved when the SAW yarn tension sensor substrate length is equal to 15 mm and its width is equal to 3mm within a fixed interval of the substrate size. An experiment of SAW yarn tension sensor about 15 mm long and 3mm wide was presented. Experimental results show that the maximum sensitivity 1982.39 Hz/g was accomplished, which confirms that the optimal sensitivity design scheme is useful and effective. PMID:24792682

Lei, Bingbing; Lu, Wenke; Zhu, Changchun; Liu, Qinghong; Zhang, Haoxin

2014-08-01

417

Proceedings of the 2007 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning, pp. 819826, Prague, June 2007. c 2007 Association for Computational Linguistics  

E-print Network

search engine to confirm that modern indexing does recognize the effect of token order on query meaning. [two] [man power] [saw], etc. One simple way to make use of these interpretations in search would is correct. Indeed, a phrasal search for "two man power saw" on Google does find the device of interest. So

California at Berkeley, University of

418

Monitoring Boreal Forest Owls in Ontario Using Tape Playback Surveys with Volunteers  

E-print Network

), Northern Saw-whet (Aegolius acadicus) and possibly Great Gray (Strix nebulosa) Owls, and reduced variance, such as the Northern Saw-whet Owl (Aegolius acadicus), can potentially be monitored at migration monitoring stations detected. Playback improved the response rate for Barred (Strix varia), Boreal (Aegolius funereus

419

Incr ease in Distribution Recor ds of Owl Species in Manitoba Based on a V olunteer Noctur nal Survey Using Bor eal Owl ( Aegolius funer eus) and Gr eat Gray Owl ( Strix nebulosa) Playback  

E-print Network

Saw-whet Owl (Aegolius acadicus). The Bor eal Owl (Aegolius funereus) and Great Gray Owl (Strix aspen parkland and grassland regions, and here, playback of Norther n Saw-whet Owl (Aegolius acadicus Survey Using Bor eal Owl ( Aegolius funer eus) and Gr eat Gray Owl ( Strix nebulosa) Playback James R

420

From student to superhero: Situational primes shape future helping  

Microsoft Academic Search

The present research uses priming techniques to modify commitment to and engagement in future helping behavior. Relative to a control condition, people primed with the exemplar Superman saw themselves as less likely (Studies 1a and 1b), and participants primed with the category superhero saw themselves as more likely (Study 1a), to help in hypothetical situations. Study 2 extended these effects

Leif D. Nelson; Michael I. Norton

2005-01-01

421

The use of grey-based Taguchi methods to determine submerged arc welding process parameters in hardfacing  

Microsoft Academic Search

In this paper, the use of grey-based Taguchi methods for the optimization of the submerged arc welding (SAW) process parameters in hardfacing with considerations of multiple weld qualities is reported. In this new approach, the grey relational analysis is adopted to solve the SAW process with multiple weld qualities. A grey relational grade obtained from the grey relational analysis is

Y. S. Tarng; S. C. Juang; C. H. Chang

2002-01-01

422

Reactions of First-Year Men to a Rape Prevention Program: Attitude and Predicted Behavior Changes  

ERIC Educational Resources Information Center

First-year men (261) saw a rape prevention program and were asked to give their reactions to what they saw by answering four open-ended questions, requesting information about whether participants experience either attitude or behavior change resulting from the program, particularly in relation to situations involving alcohol and sexually intimate…

Foubert, John D.; Tatum, Jerry L.; Donahue, Greg A.

2006-01-01

423

This copy is for your personal, noncommercial use only. You can order presentation-ready copies for distribution to your colleagues, clients or customers here or use the "Reprints" tool that appears next to any article. Visit  

E-print Network

saw a prototype for a new toy for girls: an alternative to the baby dolls then popular. In recounting create the perfect bookmark, one that would stay put. ¶ The Barbie doll was reportedly born when Ruth Handler, a founder of Mattel, was on vacation in Switzerland and saw an unusual doll in the window

Kuzmanovic, Aleksandar

424

Effects of Television Violence on Memory for Commercial Messages  

Microsoft Academic Search

Three experiments tested whether television violence impairs memory for commercials. Participants saw commercials embedded in violent or nonviolent film clips. The film clips were similar on other dimensions that might influence commercial memory (e.g., arousal and involvement). After viewing a film clip, participants completed several recall and recognition memory tests. In all experiments, participants who saw a violent film clip

Brad J. Bushman

1998-01-01

425

Standard Operating Procedure (SOP) -Vertical Bandsaw  

E-print Network

of stock, turn the saw off and wait until it comes to a complete stop before attempting to remove the blade and the blade is properly adjusted prior to turning on the machine. · Adjust the upper guard assembly to within for the type of stock being machined. · Check to ensure the band saw blade is sharpened · Check to ensure

Veiga, Pedro Manuel Barbosa

426

THE IMPACT OF WEATHER ON AIRCRAFTS ACCIDENTS  

Microsoft Academic Search

For any aircraft accident, the first suspected cause is weather until thorough investigations reveal the true cause. Indeed different weather events pose various hazards on aircrafts significantly. Since the commercialization of some of the services rendered by the South African Weather Services (SAWS) such as the aviation weather products, there is a greater need for SAWS aviation weather forecasters to

Rudzani Malala; South African Weather Service

427

Z .Earth and Planetary Science Letters 144 1996 E9E14 Express Letter  

E-print Network

Z .Earth and Planetary Science Letters 144 1996 E9­E14 Express Letter Saw-toothed pattern by progressive decay w xtowards polarity reversals, followed by sharp recovery of pre-reversal values 1 . We this `saw-toothed' pattern disappears. Further, the w xrecently published Cumulative Viscous Remanence model

Utrecht, Universiteit

428

Optimal and near-optimal advection-diffusion finite-difference  

E-print Network

in three numerical schemes for the solution of the diffusion equation with flow and decay. A five-point filter is used to isolate the long and the saw-tooth grid- scale errors. Contour plots are presented which illustrate the markedly different propagation of the long and saw-tooth errors. The energy of long

429

Design of functional devices with resonant filter with a simple sonic crystal structures  

Microsoft Academic Search

In this paper, we study propagation characteristics of surface acoustic wave (SAW) in structural array. We use focus ion beam (FIB) lithography as a fabrication process of structural array. We fabricated test devices with the structural array formed by metal deposition and etching by using the FIB process, respectively, in order to investigate SAW propagation. The experimental results show the

C. Kaneshiro; M. Ozaki; K. Koh; K. Hohkawa

2004-01-01

430

INFLUÊNCIA DO DESCAROÇAMENTO NAS CARACTERÍSTICAS TECNOLÓGICAS DA FIBRA DO ALGODÃO ANALISADAS PELO HVI (HIGH VOLUME INSTRUMENTS) E PELO AFIS (ADVANCED FIBER INFORMATION SYSTEM)1  

Microsoft Academic Search

This work had the objective to evaluate the effect of three cotton ginning methods on intrinsic and extrinsic cotton fiber characteristics analized by the HVI (High Volume Instrumentes) and AFIS (Advanced Fiber Information System) equipaments. The following treatments were studied: 1) roller gin machine; 2) 50 saw-brush gin smal works prototype; 3) stand 90 saw-brush gin machine. Seed cotton samples

ODILON RENY; RIBEIRO FERREIRA DA SILVA; MARIA JOSÉ DA SILVA

431

Evaluation of Information Professionals Competency Face Validity Test Using Rasch Model  

Microsoft Academic Search

The development of Rasch Measurement Model in social science educational measurement has rapidly expanded to other areas of education including technical and engineering fields. Originally, there was substantial controversy between those who saw Rasch Model as a relevant method of measurement in technical fields and those who saw them as essentially different. This paper is an attempt of a paradigm

AZRILAH ABD AZIZ; AZLINAH MOHAMED; AZAMI ZAHARIM

2008-01-01

432

Surface acoustic wave resonators as novel tools for multiparametric blood analysis  

Microsoft Academic Search

In this paper a new tool to assess viscoelastic and dielectric properties of human fluids is presented. Shear horizontal polarized surface acoustic waves (SH-SAW) are used to detect the viscoelastic properties of coagulating blood and blood plasma samples. One-port SAW resonators, with fundamental modes of 85, 170 und 340 MHz were developed. Additionally, their electrode structures can be used simultaneously

G. Guhr; R. Brunig; H. Schmidt; M. Weihnacht; S. Gehrisch; G. Siegert

2010-01-01

433

77 MassachuseUs Avenue Cambridge, Massachusetts  

E-print Network

-1103Jpeg;ATT00001_c We saw these people poke their head into 16-004t for a moment at 11:03 this morning-004t We saw these people poke their head into 16-004t for a moment at 11:03 this morning, at one point

434

Links to the Past: Creating Hypertext Dialogues Drawn from Narrative History Collections. Learning Page Lesson Plan.  

ERIC Educational Resources Information Center

This lesson plan asks students to use documents from "California As I Saw It: First Person Narratives, 1849-1900," in the American Memory Project to create a script depicting the motivations, expectations, fears, and realizations of immigrants who settled California between 1849 and 1900. According to the lesson plan, "California As I Saw It"…

Richardson, Colette; Davidson, Steve

435

Silicon chip separation: Meeting demands of chip embedding packaging technology - eWLB  

Microsoft Academic Search

The objective of this paper is to present the key challenges in Silicon chip separation by mechanical dicing and changes needed in the saw street design to meet the additional demands in quality requirement put-forth by chip embedding packaging technology like the embedded Wafer Level Ball Grid array [eWLB]. When standard mechanical dicing process and saw street design meant for

V. P. Ganesh; Andreas Bahr

2010-01-01

436

i i 'i i WWW--i i http://www.icmp.lviv.ua/  

E-print Network

of semiflexible poly- mers within the lattice model of self-avoiding random walks (SAW) with bending energy i i- ii i i (self-avoiding walks ­ SAW) i i , i ii i i. i i (PERM). i- , ii ( ­01E 1 1. Introduction Many polymers in chemical and biological physics are characterized by linear

437

Array automated assembly, phase 2  

NASA Technical Reports Server (NTRS)

An analysis was made of cost tradeoffs for shaping modified square wafers from cylindrical crystals. Tests were conducted of the effectiveness of texture etching for removal of surface damage on sawed wafers. A single step texturing etch appeared adequate for removal of surface damage on wafers cut with multiple blade reciprocating slurry saws.

Taylor, W. E.

1978-01-01

438

DIY TIMBER CHECKLIST This list is general in nature and covers just a small amount of the information you will need to complete your specific project.  

E-print Network

squares, etc. Power tools; drills, sanders, table saw, drop saw, router, jigsaw, belt sander, orbital permanent joints. Pre-drill screw holes and drill countersunk holes where required. The accuracy of your fillers, brushes, rollers, nails, screws, nuts and bolts, drill bits, rags, sanding blocks etc. Safety

Peters, Richard

439

www.eukidsonline.net June 2012 1 ISSN 2045256X  

E-print Network

saw images of people having sex and/or genitals, and 2% who saw violent sexual images. 32% of all 9 ­ and vice versa. Summary This report presents new findings and further analysis of the EU Kids Online 25 for kids "This new Coalition should provide both children and parents with transparent and consistent

440

The Impact of Education and Exposure on Art Therapist Identity and Perception  

Microsoft Academic Search

Students who enter a creative arts therapy program without prior exposure to a patient population experience a complex developmental journey towards creating their own identities as art therapists. In this study, 21 graduate students were asked to draw how they saw their patients and how their patients saw them. The directive was repeated 3 times throughout the course of their

Deborah L. Elkis-Abuhoff; Morgan Gaydos; Sage Rose; Robert Goldblatt

2010-01-01

441

The L4Ka Vision Uwe Dannowski Kevin Elphinstone Jochen Liedtke Gerd Lieflander Espen Skoglund  

E-print Network

Volkmar Uhlig Christian Ceelen Andreas Haeberlen Marcus V¨olp University of Karlsruhe System Architecture that have strongly influenced preparatory L4Ka work are SawMill, Drops, and Mungi. SawMill is a joint research has been done on networking support for continuous-media applications, very few projects tackle

Pennsylvania, University of

442

Visual Self-Recognition in Mirrors and Live Videos: Evidence for a Developmental Asynchrony  

ERIC Educational Resources Information Center

Three experiments (N = 123) investigated the development of live-video self-recognition using the traditional mark test. In Experiment 1, 24-, 30- and 36-month-old children saw a live video image of equal size and orientation as a control group saw in a mirror. The video version of the test was more difficult than the mirror version with only the…

Suddendorf, Thomas; Simcock, Gabrielle; Nielsen, Mark

2007-01-01

443

Technology for All: Turning a Keyword into a School Subject in Post-War Sweden  

ERIC Educational Resources Information Center

The decades following the Second World War saw strong technological development and economic growth. They also saw "the advent of technology education", a period of extensive curriculum development in this field. But what was done and why? In order to obtain a better understanding of the historical roots of technology education, in this…

Hultén, Magnus

2013-01-01

444

4 CaCtusandsuCCulentJournal Bergerocactus emoryi  

E-print Network

Just south of San Quintin, we spent an hour and a half at a site by the Pacific Ocean, where I saw five ganderi ssp catavensis. Not far south of Catavina, at Rancho San Luis, we saw a Cylindropuntia chollaCtusandsuCCulentJournal In Sierra San Francisco we stopped to see a famous and oft-photographed, massive crest of Ferocactus

Gorelick, Root

445

PRECIPITATION The images above use daily precipitation statistics from NWS COOP, CoCoRaHS, and CoAgMet stations. From top to bottom, and left to right: most recent 7-days of accumulated  

E-print Network

an inch of moisture including Phillips, Sedgwick, and Morgan counties. Isolated areas along the Front and Kiowa Counties saw over an inch of rain. Parts of Otero and Crowley Counties saw a much-needed half inch and below average. Southern Sublette, Lincoln, Uinta Counties and portions of Sweetwater County were between

Collett Jr., Jeffrey L.

446

Computational Models Lecture 5 A Few More PDAs Examples  

E-print Network

and Edna sinned" "Red rum, sir, is murder" Slides modified by Benny Chor, based on original slides = wR . "Madam I'm Adam" "Dennis and Edna sinned" "Red rum, sir, is murder" "Able was I ere I saw Elba sinned" "Red rum, sir, is murder" "Able was I ere I saw Elba" "In girum imus nocte et consumimur igni

Beimel, Amos

447

ABCD springer.com Universit de Franche-Comt  

E-print Network

; Simulation of advanced BAW and SAW devices; Analysis of band gaps in phononic structures; Experimental communication market has triggered extensive research on the bulk as well as surface acoustic wave devices Resonator (FBAR) and Layered SAW devices were reported recently. The other recent advance of acoustic waves

Jeanjean, Louis

448

Imagining the Cardioid  

ERIC Educational Resources Information Center

The author first saw Trevor Fletcher's film on the cardioid as an undergraduate in 1959. When he saw Fletcher's cardioid film once again, the author was vividly reminded of his first experiences of animated mathematics nearly 50 years before. He discovered that the idea of using mental pictures to develop dynamic images came from work by the Swiss…

Rogers, Leo

2008-01-01

449

R. Krishnamoorthy Precision Engineering Research Laboratory,  

E-print Network

was determined for different workpiece materials, and the wear rate of the saw blade using ELID was found to be of the same order as the wear rate of the saw blade using intermittent dressing with a porous ceramic stick of film wear and rate of diamond wear) and their combined effects are discussed. Successful use of ELID

450

Proceedings of the 17th Central Hardwood Forest Conference GTR-NRS-P-78 (2011) 535 INTRODUCTION  

E-print Network

for comparison: manual (chainsaws and brush saws), mechanical (tree mower), basal bark herbicide (15-percent were: manual (chainsaws and brush saws), mechanical (tree mower), herbicide (15-percent triclopyr and 3-percent imazapyr), mechanical plus herbicide, and manual plus herbicide. Financial inputs, consisting

451

University of the West of Scotland's (UWS) School of Science collaborated with Gas Sensing Solutions  

E-print Network

sensitive thin film SAW gas sensors based on ZnO nanowires. The project was managed by Dr Richard Fu, who proved that ZnO thin film based nanowire SAW devices can be fabricated to detect various gases. The new the above issues. University Identified Solution This project looked at combining advanced thin film Surface

Greenaway, Alan

452

An all fiber-optic sensor for surface acoustic wave measurements  

NASA Technical Reports Server (NTRS)

A surface acoustic wave (SAW) sensor constructed from single-mode fiber-optic components is described. An analysis of reciprocal and nonreciprocal modes of operation of the sensor is presented. Results from measurements on a variety of SAW devices illustrate the use of the sensor. The amplitude sensitivity is 0.0003 A for an integration time of 0.1 s.

Bowers, J. E.; Jungerman, R. L.; Khuri-Yakub, B. T.; Kino, G. S.

1983-01-01

453

Cross-Modal Interactions in the Perception of Musical Performance  

ERIC Educational Resources Information Center

We investigate the dynamics of sensory integration for perceiving musical performance, a complex natural behavior. Thirty musically trained participants saw, heard, or both saw and heard, performances by two clarinetists. All participants used a sliding potentiometer to make continuous judgments of tension (a measure correlated with emotional…

Vines, Bradley W.; Krumhansl, Carol L.; Wanderley, Marcelo M.; Levitin, Daniel J.

2006-01-01

454

Development of a New Surface Acoustic Wave Based Gyroscope on a X-112?Y LiTaO3 Substrate  

PubMed Central

A new micro gyroscope based on the surface acoustic wave (SAW) gyroscopic effect was developed. The SAW gyroscopic effect is investigated by applying the surface effective permittivity method in the regime of small ratios of the rotation velocity and the frequency of the SAW. The theoretical analysis indicates that the larger velocity shift was observed from the rotated X-112°Y LiTaO3 substrate. Then, two SAW delay lines with reverse direction and an operation frequency of 160 MHz are fabricated on a same X-112°Y LiTaO3 chip as the feedback of two SAW oscillators, which act as the sensor element. The single-phase unidirectional transducer (SPUDT) and combed transducers were used to structure the delay lines to improve the frequency stability of the oscillator. The rotation of a piezoelectric medium gives rise to a shift of the propagation velocity of SAW due to the Coriolis force, resulting in the frequency shift of the SAW device, and hence, the evaluation of the sensor performance. Meanwhile, the differential structure was performed to double the sensitivity and compensate for the temperature effects. Using a precise rate table, the performance of the fabricated SAW gyroscope was evaluated experimentally. A sensitivity of 1.332 Hz deg?1 s at angular rates of up to 1,000 deg s?1 and good linearity are observed. PMID:22346678

Wang, Wen; Liu, Jiuling; Xie, Xiao; Liu, Minghua; He, Shitang

2011-01-01

455

Development of a new surface acoustic wave based gyroscope on a X-112°Y LiTaO3 substrate.  

PubMed

A new micro gyroscope based on the surface acoustic wave (SAW) gyroscopic effect was developed. The SAW gyroscopic effect is investigated by applying the surface effective permittivity method in the regime of small ratios of the rotation velocity and the frequency of the SAW. The theoretical analysis indicates that the larger velocity shift was observed from the rotated X-112°Y LiTaO3 substrate. Then, two SAW delay lines with reverse direction and an operation frequency of 160 MHz are fabricated on a same X-112°Y LiTaO3 chip as the feedback of two SAW oscillators, which act as the sensor element. The single-phase unidirectional transducer (SPUDT) and combed transducers were used to structure the delay lines to improve the frequency stability of the oscillator. The rotation of a piezoelectric medium gives rise to a shift of the propagation velocity of SAW due to the Coriolis force, resulting in the frequency shift of the SAW device, and hence, the evaluation of the sensor performance. Meanwhile, the differential structure was performed to double the sensitivity and compensate for the temperature effects. Using a precise rate table, the performance of the fabricated SAW gyroscope was evaluated experimentally. A sensitivity of 1.332 Hz deg(-1) s at angular rates of up to 1,000 deg s(-1) and good linearity are observed. PMID:22346678

Wang, Wen; Liu, Jiuling; Xie, Xiao; Liu, Minghua; He, Shitang

2011-01-01

456

P3O-4 SiO2\\/Grooved Al-Electrodes\\/LiTaO3 Structures Having Large Reflection Coefficient, Large Coupling Factor, and Excellent Temperature Characteristics Even with Thick Al Electrode  

Microsoft Academic Search

A surface acoustic wave (SAW) substrate for a duplexer such as Personal Communication Service handy phone system in US is required to have a good temperature coefficient of frequency (TCF), an optimum electromechanical coupling factor, and a large reflection coefficient. However, there have been no SAW substrates satisfying all of them. Because the duplexer is composed of resonator-type devices such

Michio Kadota; T. K. Murata

2006-01-01

457

Evaluation of bone carbonization by CO2 laser osteotomy  

Microsoft Academic Search

Osteotomy is needed in surgical operations. Bone saw is used in that case. But the bone cutting using saw is very hard operation to the doctors and also to the patients. New innovations for osteotomy are needed. Laser systems can be applied for this purpose. CO2 laser has the long history of medical application. For medical application of lasers, carbonization

R. Shimokita; S.-I. Okihara; S. Eura; H. Eda

2008-01-01

458

Occupational Health & Safety Office | Shop Safety | 4/19/11 Shop Safety  

E-print Network

Lacerations Amputations Death Always work safely around machines Drill presses, table saws, band saws or shear. Rules must always be followed to help prevent work-related injuries in shops. For owners All staff and students who work in a shop must be authorized to be there by a responsible person

Wilcock, William

459

Written in the Stars  

E-print Network

I first really saw the stars when I was 10 years old and on my first camping trip, in Ontario. I remember awakening late one night, stepping outside the tent, and looking up. I was completely stunned by what I saw. ...

Seager, Sara

460

PHYSICAL REVIEW E 87, 053004 (2013) Modulated exponential films generated by surface acoustic waves and their role in liquid wicking  

E-print Network

acoustic pressure of scattered surface acoustic waves (SAWs) at the contact line of a liquid film pinnedPHYSICAL REVIEW E 87, 053004 (2013) Modulated exponential films generated by surface acoustic waves.053004 PACS number(s): 47.55.dr, 43.35.Pt, 68.35.Iv, 78.67.Tf I. INTRODUCTION Surface acoustic waves (SAWs

Chang, Hsueh-Chia

461

Through the Looking Glass: Reflection or Refraction? Do You See What I See?  

ERIC Educational Resources Information Center

The intent of this study was to interpret the processes of journal keeping through written and electronic means to determine if the interns "saw" what their master teachers' saw in the myriad complexities of the social studies classroom. Three teachers identified as master teachers and interns placed under their tutelage examined interns their…

Christensen, Lois M.; Wilson, Elizabeth K.; Sunal, Cynthia S.; Blalock, Deborah; St. Clair-Shingleton, Lori; Warren, Emily

2004-01-01

462

Teaching about Haiti  

ERIC Educational Resources Information Center

For a few harrowing weeks in January, the eyes of the world were on Haiti, struggling with the impact of a 7.0 magnitude earthquake. In the spotlight's glare, people saw the devastation wrought by the natural disaster. Viewers with a critical eye or access to alternative media also saw a U.S. military presence more focused on security than food…

Sokolower, Jody

2010-01-01

463

Implementation of Submerged Arc Welding Training. Final Report.  

ERIC Educational Resources Information Center

A unit on submerged arc welding (SAW) was developed and integrated into the welding program at Seattle Central Community College (Washington) during the period December 1983 through May 1984. During this time, 10 major users of SAW in the area were contacted and mailed questionnaires. Follow up consisted of telephone calls and personal contact as…

Bowick, Earl; Todd, John

464

Forecast Skill of Synoptic Conditions Associated with Santa Ana Winds in Southern California  

E-print Network

days. SAW events exhibit large interannual variations and possible mechanisms responsible for trends associated with SAW were derived from NCEP CFS reforecasts. The CFS model exhibits small systematic biases; Raphael 2003; Hughes and Hall 2009). A surface high pressure system over the Great Basin and a low

California at Santa Barbara, University of

465

NIDIS Weekly Climate, Water Drought Assessment Summary  

E-print Network

Phee. McPhee storage has decreased this past month, but usually its levels are increasing during this time). Both gages saw decreases from last week, but remain in the normal conditions range. #12;Reservoirs: All reservoirs in the UCRB saw decreases over the past week, except for Lake Dillon. Dillon volume slightly

466

A Study of Community Junior College Professional Staff Perception of Their Institutions.  

ERIC Educational Resources Information Center

This study of staff perceptions (15 institutions in 13 states) found that teachers generally (1) felt the college a stepping-stone to a senior institution, (2) saw excellent teaching as a contribution to college aims, (3) by supporting an open door policy, acknowledged the students' lower ability, (4) saw the junior college as different from…

Gentry, Larry Dean

467

Sekulovski, G. (2008). The Border City in a Border Country: the Case of Skopje. Regions Magazine 270, 1, 18-20 [http://rsa.informaworld.com/srsa/content~content=a901757357~db=all~order=page  

E-print Network

270, 1, 18- 20 [http://rsa.informaworld.com/srsa/content~content=a901757357~db=all~order=page] 1 are exemplary. Without neglecting the importance of historical contexts which saw their birth and local conditions which saw their growth, they depend in effect, more than other entities, on a clear determination

Boyer, Edmond

468

High efficiency elastic convolver using KNbO3 substrate  

Microsoft Academic Search

Elastic convolvers are very important for signal processing devices of the spread spectrum communication (SSC) systems. The better efficient convolvers are required for the application for the spread spectrum and next stage communication systems. A high value of coupling coefficient is very important for wideband and high efficiency SAW devices such as SAW convolvers. Potassium niobate (KNbO3) has large piezoelectric

K. Yamanouchi; H. Odagawa; K. Morozumi; Y. Cho

1997-01-01

469

A Surface Acoustic Wave Elastic Convolver using a KNbO3 Single Crystal Substrate  

Microsoft Academic Search

Elastic convolvers are very important in signal processing devices of spread spectrum communication (SSC) systems. Highly efficient convolvers are required in the application of the spread spectrum and next stage communication systems. A high value of the coupling coefficient is very important for wideband and high efficiency surface acoustic wave (SAW) devices, such as SAW convolvers. Potassium niobate (KNbO3) has

Kazuhiko Yamanouchi; Hiroyuki Odagawa; Kenyuu Morozumi; Yasuo Cho

1998-01-01

470

Elijah Parish Lovejoy the Man and the Myth  

Microsoft Academic Search

The nation saw Lovejoy as representative of republican ideals; virtue. temperance. liberty, and self-sacrifice. Lovejoy had sacrificed his life for the Republic in defense of democratic values. Lovejoy was also a man who feared absolute power. It led him to despise Catholicism (under its Papal authority), fear immigration, and eventually despise the slaveholder. American's saw Lovejoy's stance against the mob

Scott Shirey

1998-01-01

471

Information instantaneously  

E-print Network

CSC310 -- Information Theory Sam Roweis Lecture 4: Entropy & Huffman Codes September 20, 2006 Reminder: Searching for Optimal Codes 1 . Last class we saw how to construct an instantaneously decodable code for any set of codeword lengths l i satisfying # i 2 -l i # 1. .We also saw that if # i 2 -l i > 1

Roweis, Sam

472

instantaneously independently  

E-print Network

Lecture 4: Entropy & Huffman Codes Sam Roweis September 21, 2005 Reminder: Searching for Optimal Codes . Last class we saw how to construct an instantaneously decodable code for any set of codeword lengths l i satisfying # i 2 -l i # 1. .We also saw that if # i 2 -l i > 1, no uniquely decodable code

Roweis, Sam

473

CSC310 Information Theory Sam Roweis Entropy & Huffman Codes  

E-print Network

CSC310 ­ Information Theory Sam Roweis Lecture 4: Entropy & Huffman Codes September 20, 2006 Reminder: Searching for Optimal Codes 1 · Last class we saw how to construct an instantaneously decodable code for any set of codeword lengths li satisfying i 2-li 1. · We also saw that if i 2-li > 1

Roweis, Sam

474

Facts about Broken Bones  

MedlinePLUS

... good as new. What to Do When the Cast Comes Off Can you believe they use a saw to remove your cast? The funny thing is this saw doesn't ... at all. It might even tickle! Once the cast is off, the injured area will probably look ...

475

51. AERIAL VIEW OF HULLOAKES LUMBER CO. LOOKING FROM NORTHWEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

51. AERIAL VIEW OF HULL-OAKES LUMBER CO. LOOKING FROM NORTHWEST TO SOUTHEAST SHOWING COMPLETED BUILDING MODIFICATIONS TO ACCOMMODATE NEW STEAM-ENGINE, BAND SAW AND SAW-FILING ROOM AND RECONSTRUCTION OF BACK END OF MAIN SAWMILL. PHOTOGRAPHER: WESTERN WAYS, INC. CORVALLIS, OREGON. DATE: 1957. COURTESY OF RALPH HULL. - Hull-Oakes Lumber Company, 23837 Dawson Road, Monroe, Benton County, OR

476

Surface acoustic wave microfluidics  

PubMed Central

The recent introduction of surface acoustic wave (SAW) technology onto lab-on-a-chip platforms has opened a new frontier in microfluidics. The advantages provided by such SAW microfluidics are numerous: simple fabrication, high biocompatibility, fast fluid actuation, versatility, compact and inexpensive devices and accessories, contact-free particle manipulation, and compatibility with other microfluidic components. We believe that these advantages enable SAW microfluidics to play a significant role in a variety of applications in biology, chemistry, engineering, and medicine. In this review article, we discuss the theory underpinning SAWs and their interactions with particles and the contacting fluids in which they are suspended. We then review the SAW-enabled microfluidic devices demonstrated to date, starting with devices that accomplish fluid mixing and transport through the use of travelling SAW; we follow that by reviewing the more recent innovations achieved with standing SAW that enable such actions as particle/cell focusing, sorting, and patterning. Finally, we look forward and appraise where the discipline of SAW microfluidics could go next. PMID:23900527

Ding, Xiaoyun; Li, Peng; Lin, Sz-Chin Steven; Stratton, Zackary S.; Nama, Nitesh; Guo, Feng; Slotcavage, Daniel; Mao, Xiaole; Shi, Jinjie; Costanzo, Francesco; Huang, Tony Jun

2014-01-01

477

Using Social Visualization to Motivate Social Production  

Microsoft Academic Search

In this paper we argue that social visualization can motivate contributors to social production projects, such as Wikipedia and open source development. As evidence, we present CodeSaw, a social visualization of open source software development that we studied with real open source communities. CodeSaw mines open source archives to visualize group dynamics that currently lie buried in textual databases. Furthermore,

Eric Gilbert; Karrie Karahalios

2009-01-01

478

Toward soft-tissue elastography using digital holography to monitor surface acoustic waves  

NASA Astrophysics Data System (ADS)

Measuring the elasticity distribution inside the human body is of great interest because elastic abnormalities can serve as indicators of several diseases. We present a method for mapping elasticity inside soft tissues by imaging surface acoustic waves (SAWs) with digital holographic interferometry. With this method, we show that SAWs are consistent with Rayleigh waves, with velocities proportional to the square root of the elastic modulus greater than 2-40 kPa in homogeneous tissue phantoms. In two-layer phantoms, the SAW velocity transitions approximately from that of the lower layer to that of the upper layer as frequency is increased in agreement with the theoretical relationship between SAW dispersion and the depth-dependent stiffness profile. We also observed deformation in the propagation direction of SAWs above a stiff inclusion placed 8 mm below the surface. These findings demonstrate the potential for quantitative digital holography-based elastography of soft tissues as a noninvasive method for disease detection.

Li, Shiguang; Mohan, Karan D.; Sanders, William W.; Oldenburg, Amy L.

2011-11-01

479

Resonant leadership, workplace empowerment, and "spirit at work": impact on RN job satisfaction and organizational commitment.  

PubMed

Canadian researchers have developed the Spirit At Work (SAW) tool for identifying the experiences of individuals who are passionate about and energized by their work. This article describes (a) what registered nurses perceive as contributing to their personal SAW; and (b) the relationships among resonant leadership, structural empowerment concepts, psychological empowerment concepts, SAW concepts, job satisfaction, organizational commitment, and the demographic variables of experience, education, and rank in the RN workplace. The theoretical model was tested using LISREL 8.80 and survey data from 147 randomly selected RNs. Engaging work was found to account for 63% of the explained variance in the model's endogenous variables. Spiritual connection had a causal effect on organizational commitment, while resonant leadership and individual empowerment had significant causal influence on SAW, job satisfaction, and organizational commitment. These results strengthen those of previous studies reporting workplace structures/processes/contributions leading to superior care environments. Future studies will clarify the role of SAW in the workplace. PMID:24617283

Wagner, Joan I J; Warren, Sharon; Cummings, Greta; Smith, Donna L; Olson, Joanne K

2013-12-01

480

On-Orbit Performance Degradation of the International Space Station P6 Photovoltaic Arrays  

NASA Technical Reports Server (NTRS)

This paper discusses the on-orbit performance and performance degradation of the International Space Station P6 solar array wings (SAWs) from the period of December 2000 through February 2003. Data selection considerations and data reduction methods are reviewed along with the approach for calculating array performance degradation based on measured string shunt current levels. Measured degradation rates are compared with those predicted by the computational tool SPACE and prior degradation rates measured with the same SAW technology on the Mir space station. Initial results show that the measured SAW short-circuit current is degrading 0.2 to 0.5 percent per year. This degradation rate is below the predicted rate of 0.8 percent per year and is well within the 3 percent estimated uncertainty in measured SAW current levels. General contributors to SAW degradation are briefly discussed.

Kerslake, Thomas W.; Gustafson, Eric D.

2003-01-01

481

A 200 MHz surface acoustic wave mass microbalance  

NASA Technical Reports Server (NTRS)

The principle of operation of the surface acoustic wave (SAW) piezoelectric crystals used as microgravimetric sensors in mass microbalances is discussed. Special attention is given to a SAW 200-MHz crystal developed for measuring molecular deposition on spacecrafts, whose operating frequency does not depend on the thickness of the crystal. The frequency stability of the 200 MHz SAW device is better than 5 x 10 exp -9, which corresponds to a lower limit-of-detection of 3 x 10 exp -12 g for a signal-to-noise ratio of 3. A block diagram of the 200 MHz SAW mass microbalance and a schematic diagram of SAW resonator are presented together with performance data of this device.

Bowers, William D.; Chuan, Raymond L.

1990-01-01

482

Analysis of Mass Loading Effect on Guided Shear Horizontal Surface Acoustic Wave on Liquid/Au/Quartz Structure for Biosensor Application  

NASA Astrophysics Data System (ADS)

A numerical analysis of a shear horizontal surface acoustic wave (SH-SAW) immunoassay biosensor has been investigated. The numerical calculation method proposed by Campbell and Jones has generally been used to calculate SAW propagation characteristics. In this paper, a numerical calculation method for SH-SAW propagation characteristics, which is a modified method of Campbell and Jones involving the effect of liquid viscosity is applied to quartz. A mass loading sensitivity of a 250 MHz SH-SAW delay-line biosensor was calculated and compared with the experimental results. It can be concluded from the results that viscosity sensitivity is dominant over mass loading sensitivity for 250 MHz SH-SAW biosensors.

Goto, Mikihiro; Yatsuda, Hiromi; Kondoh, Jun

2013-07-01

483

Degradation of Liquid-Phase Shear Horizontal Surface Acoustic Wave Sensor Owing to Lack of Energy Concentration of Surface and a Compensation Method  

NASA Astrophysics Data System (ADS)

In this paper we describe liquid-phase two-channel shear horizontal surface acoustic wave (SH-SAW) delay-line sensor devices on 36° Y-X LiTaO3 substrates. One delay line has a metallized propagation area and the other has an unmetallized propagation area. The permittivity and conductivity of the liquids can be calculated from the velocity changes and attenuation changes of the SH-SAWs in the two delay-lines. However, in the case of the low-permittivity liquids, the SH-SAWs in the delay line with an unmetallized propagation area can be degraded owing to the lack of SH-SAW energy concentration of the surface. Thus the obtained permittivity and conductivity of the liquids were slightly different from the exact values. In this paper, the drawback of the liquid-phase SH-SAW sensors is described, and in order to overcome this drawback, a compensation method is presented.

Kogai, Takashi; Yatsuda, Hiromi; Shiokawa, Showko

2008-05-01

484

Swimming using surface acoustic waves.  

PubMed

Microactuation of free standing objects in fluids is currently dominated by the rotary propeller, giving rise to a range of potential applications in the military, aeronautic and biomedical fields. Previously, surface acoustic waves (SAWs) have been shown to be of increasing interest in the field of microfluidics, where the refraction of a SAW into a drop of fluid creates a convective flow, a phenomenon generally known as SAW streaming. We now show how SAWs, generated at microelectronic devices, can be used as an efficient method of propulsion actuated by localised fluid streaming. The direction of the force arising from such streaming is optimal when the devices are maintained at the Rayleigh angle. The technique provides propulsion without any moving parts, and, due to the inherent design of the SAW transducer, enables simple control of the direction of travel. PMID:23431358

Bourquin, Yannyk; Cooper, Jonathan M

2013-01-01

485

A Comparison of Surface Acoustic Wave Modeling Methods  

NASA Technical Reports Server (NTRS)

Surface Acoustic Wave (SAW) technology is low cost, rugged, lightweight, extremely low power and can be used to develop passive wireless sensors. For these reasons, NASA is investigating the use of SAW technology for Integrated Vehicle Health Monitoring (IVHM) of aerospace structures. To facilitate rapid prototyping of passive SAW sensors for aerospace applications, SAW models have been developed. This paper reports on the comparison of three methods of modeling SAWs. The three models are the Impulse Response Method a first order model, and two second order matrix methods; the conventional matrix approach, and a modified matrix approach that is extended to include internal finger reflections. The second order models are based upon matrices that were originally developed for analyzing microwave circuits using transmission line theory. Results from the models are presented with measured data from devices.

Wilson, W. c.; Atkinson, G. M.

2009-01-01

486

Hydrodynamic blade guide  

DOEpatents

A saw having a self-pumped hydrodynamic blade guide or bearing for retaining the saw blade in a centered position in the saw kerf (width of cut made by the saw). The hydrodynamic blade guide or bearing utilizes pockets or grooves incorporated into the sides of the blade. The saw kerf in the workpiece provides the guide or bearing stator surface. Both sides of the blade entrain cutting fluid as the blade enters the kerf in the workpiece, and the trapped fluid provides pressure between the blade and the workpiece as an inverse function of the gap between the blade surface and the workpiece surface. If the blade wanders from the center of the kerf, then one gap will increase and one gap will decrease and the consequent pressure difference between the two sides of the blade will cause the blade to re-center itself in the kerf. Saws using the hydrodynamic blade guide or bearing have particular application in slicing slabs from boules of single crystal materials, for example, as well as for cutting other difficult to saw materials such as ceramics, glass, and brittle composite materials.

Blaedel, Kenneth L. (Dublin, CA); Davis, Pete J. (Pleasanton, CA); Landram, Charles S. (Livermore, CA)

2000-01-01

487

Method for maintaining a cutting blade centered in a kerf  

SciTech Connect

A saw having a self-pumped hydrodynamic blade guide or bearing for retaining the saw blade in a centered position in the saw kerf (width of cut made by the saw). The hydrodynamic blade guide or bearing utilizes pockets or grooves incorporated into the sides of the blade. The saw kerf in the workpiece provides the guide or bearing stator surface. Both sides of the blade entrain cutting fluid as the blade enters the kerf in the workpiece, and the trapped fluid provides pressure between the blade and the workpiece as an inverse function of the gap between the blade surface and the workpiece surface. If the blade wanders from the center of the kerf, then one gap will increase and one gap will decrease and the consequent pressure difference between the two sides of the blade will cause the blade to re-center itself in the kerf. Saws using the hydrodynamic blade guide or bearing have particular application in slicing slabs from boules of single crystal materials, for example, as well as for cutting other difficult to saw materials such as ceramics, glass, and brittle composite materials.

Blaedel, Kenneth L. (Dublin, CA); Davis, Pete J. (Pleasanton, CA); Landram, Charles S. (Livermore, CA)

2002-01-01

488

Hydrodynamic blade guide  

SciTech Connect

A saw having a self-pumped hydrodynamic blade guide or bearing for retaining the saw blade in a centered position in the saw kerf (width of cut made by the saw). The hydrodynamic blade guide or bearing utilizes pockets or grooves incorporated into the sides of the blade. The saw kerf in the workpiece provides the guide or bearing stator surface. Both sides of the blade entrain cutting fluid as the blade enters the kerf in the workpiece, and the trapped fluid provides pressure between the blade and the workpiece as an inverse function of the gap between the blade surface and the workpiece surface. If the blade wanders from the center of the kerf, then one gap will increase and one gap will decrease and the consequent pressure difference between the two sides of the blade will cause the blade to re-center itself in the kerf. Saws using the hydrodynamic blade guide or bearing have particular application in slicing slabs from boules of single crystal materials, for example, as well as for cutting other difficult to saw materials such as ceramics, glass, and brittle composite materials.

Blaedel, K.L.; Davis, P.J.; Landram, C.S.

2000-07-04

489

The Effects Of Sawdust Addition On The Insulating Characteristics Of Clays From The Federal Capital Territory Of Abuja  

NASA Astrophysics Data System (ADS)

Insulating properties of clays from The Federal Capital of Abuja like linear shrinkage, solid density, apparent porosity and thermal conductivity were characterized with a view of studying the effect of sawdust on them. The results showed that the linear shrinkage improved from an average of 8.57% for the three samples for 0% sawdust to an average of 8.32% with 40% addition of saw dust, bringing them closer to the lower range of the international standard of 7-10%. Solid density averaged 3.18g/cm3 with 0% saw dust and 2.91g/cm 3 with 40% saw dust, still bringing them closer to the international range of 2.3-3.5g/cm3 . Apparent porosity averaged 13% with 0% saw dust and 17% with 40% addition of saw dust bringing them closer to the acceptable range of 20-80%. while thermal conductivity averaged 0.493W/mo k with 0% saw dust and 0.134W/mo k with 40% saw dust thereby improving their insulating properties. This 40% sawdust addition was discovered to be the maximum under which mechanical strength and other refractory properties of clay will remain stable

Manukaji, John U.

2012-03-01

490

Improving thin-film zinc-oxide surface acoustic wave device insertion loss using a grooved reflective grating structure  

NASA Astrophysics Data System (ADS)

A novel silicon groove reflective grating structure (RGS) to reduce effectively the insertion loss of a high C-axis (002) thin-film zinc oxide (ZnO) surface acoustic wave (SAW) device is proposed. The insertion loss (S21 parameter) of three types of SAW devices was investigated and compared; one type had no RGS design, and the other two types had either a conventional metal electrode RGS or a novel etched silicon groove RGS. The wave propagation modes, the harmonic response, and the displacement amplitude profile of the proposed SAW devices were simulated by finite element analysis software (ANSYS). The implemented basic SAW device consists of a sputter-deposited high-quality ZnO thin film on the surface of a Si/SiO2/Si3N4/Cr/Au substrate. The insertion loss of the proposed SAW device with silicon groove RGS can be reduced to -19.49 dB, which is much smaller than the insertion losses of the SAW devices with a metal electrode-type RGS (-33.15 dB) and without an RGS (-47.9 dB). The resonant frequencies of the SAW devices studied (47.37 to 48.05 MHz) are in close agreement with the simulated results (46.8 to 47.55 MHz).

Huang, I.-Yu; Lin, Chang-Yu; Lan, Je-Wei

2013-01-01

491

LETTER TO THE EDITOR: High-frequency single-electron transport in a quasi-one-dimensional GaAs channel induced by surface acoustic waves  

NASA Astrophysics Data System (ADS)

We report on an experimental investigation of the direct current induced by transmitting a surface acoustic wave (SAW) with frequency 2.7 GHz through a quasi-one-dimensional (1D) channel defined in a GaAs - AlGaAs heterostructure by a split gate, when the SAW wavelength was approximately equal to the channel length. At low SAW power levels the current reveals oscillatory behaviour as a function of the gate voltage with maxima between the plateaux of quantized 1D conductance. At high SAW power levels, an acoustoelectric current was observed at gate voltages beyond pinch-off. In this region the current displays a step-like behaviour as a function of the gate voltage (or of the SAW power) with the magnitude corresponding to the transfer of one electron per SAW cycle. We interpret this as due to trapping of electrons in the moving SAW-induced potential minima with the number of electrons in each minimum being controlled by the electron - electron interactions. As the number of electrons is reduced, the classical Coulomb charging energy becomes the Mott - Hubbard gap between two electrons and finally the system becomes a sliding Mott insulator with one electron in each well.

Shilton, J. M.; Talyanskii, V. I.; Pepper, M.; Ritchie, D. A.; Frost, J. E. F.; Ford, C. J. B.; Smith, C. G.; Jones, G. A. C.

1996-09-01

492

Effective use of molecular recognition in gas sensing: results from acoustic wave and in situ FT-IR measurements.  

PubMed

To probe directly the analyte/film interactions that characterize molecular recognition in gas sensors, we recorded changes to the in situ surface vibrational spectra of specifically functionalized surface acoustic wave (SAW) devices concurrently with analyte exposure and SAW measurement of the extent of sorption. Fourier transform infrared external-reflectance spectra (FT-IR-ERS) were collected from operating 97-MHz SAW delay lines during exposure to a range of analytes as they interacted with thin-film coatings previously shown to be selective: cyclodextrins for chiral recognition, nickel camphorates for Lewis bases such as pyridine or organophosphonates, and phthalocyanines for aromatic compounds. In most cases where specific chemical interactions--metal coordination, "cage" compound inclusion, or pi-stacking--were expected, analyte dosing caused distinctive changes in the IR spectra, together with anomalously large SAW sensor responses. In contrast, control experiments involving the physisorption of the same analytes by conventional organic polymers did not cause similar changes in the IR spectra, and the SAW responses were smaller. For a given conventional polymer, the partition coefficients (or SAW sensor signals) roughly followed the analyte fraction of saturation vapor pressure. These SAW/FT-IR results support earlier conclusions derived from thickness-shear mode resonator data. PMID:10450152

Hierlemann, A; Ricco, A J; Bodenhöfer, K; Göpel, W

1999-08-01

493

Sulfide-rich metallic impact melts from chondritic parent bodies  

NASA Astrophysics Data System (ADS)

Sacramento Wash 005 (SaW) 005, Meteorite Hills 00428 (MET) 00428, and Mount Howe 88403 (HOW) 88403 are S-rich Fe,Ni-rich metal meteorites with fine metal structures and homogeneous troilite. We compare them with the H-metal meteorite, Lewis Cliff 88432. Phase diagram analyses suggest that SaW 005, MET 00428, and HOW 88403 were liquids at temperatures above 1350°C. Tridymite in HOW 88403 constrains formation to a high-temperature and low-pressure environment. The morphology of their metal-troilite structures may suggest that MET 00428 cooled the slowest, SaW 005 cooled faster, and HOW 88403 cooled the quickest. SaW 005 and MET 00428 contain H-chondrite like silicates, and SaW 005 contains a chondrule-bearing inclusion that is texturally and compositionally similar to H4 chondrites. The compositional and morphological similarities of SaW 005 and MET 00428 suggest that they are likely the result of impact processing on the H-chondrite parent body. SaW 005 and MET 00428 are the first recognized iron- and sulfide-rich meteorites, which formed by impact on the H-chondrite parent body, which are distinct from the IIE-iron meteorite group. The morphological and chemical differences of HOW 88403 suggest that it is not from the H-chondrite body, although it likely formed during an impact on a chondritic parent body.

Schrader, Devin L.; Lauretta, Dante S.; Connolly, Harold C. _jr., Jr.; Goreva, Yulia S.; Hill, Dolores H.; Domanik, Ken J.; Berger, Eve L.; Yang, Hexiong; Downs, Robert T.

2010-05-01

494

Detection of odorant molecules via surface acoustic wave biosensor array based on odorant-binding proteins.  

PubMed

In this paper, we present an array of biosensors for vapour phase detection of odorant molecules based on surface acoustic wave (SAW) resonators coated with odorant-binding proteins (OBPs). For the first time, the sensing capabilities of three different OBPs, as sensitive layers for SAW devices, are studied and compared. The SAW biosensor array is composed of three SAW devices coated by the droplet method with the wild-type OBP from cow (wtbOBP), a double mutant of the OBP from cow (dmbOBP) and the wild-type OBP from pig (wtpOBP). An uncoated device is used to compensate the variations of the environmental parameters. The SAW devices consist of two-port resonators fabricated on quartz (ST-cut, x propagation) with electrodes made of aluminium covered with a thin gold film (2 nm thick). The obtained surface densities of OBP layers are between 1.18×10(-6) kg/m(2) and 2.31×10(-6) kg/m(2) and were calculated measuring the resonant frequency shift of the SAW devices after the coating. The SAW biosensor array was tested in nitrogen upon exposure to vapours of R-(-)-1-octen-3-ol (octenol), in the range of concentration between 13 and 61 ppm, and R-(-)-carvone (carvone), in the range between 9 and 80 ppm. The highest sensitivity for detection of octenol (25.9 Hz/ppm) was obtained using the wtpOBP-based SAW biosensor, while the highest sensitivity for detection of carvone (9.2 Hz/ppm) was obtained using the dmbOBP-based SAW biosensor. PMID:22981410

Di Pietrantonio, F; Cannatà, D; Benetti, M; Verona, E; Varriale, A; Staiano, M; D'Auria, S

2013-03-15

495

The ratio between anterior abdominal wall surface/wall defect surface: a new parameter to classify abdominal incisional hernias.  

PubMed

Current classifications of incisional hernias are often not suitable. The aim of our study was to demonstrate that it is important to consider not only the wall defect surface (WDS) but also the total surface of the anterior abdominal wall (SAW) and the ratio between SAW/WDS). Twenty-three patients affected by > 10 cm size incisional hernias were examined for anthropometric analyses. The SAW, the WDS and the ratio SAW/WDS were calculated. All of the 23 patients were operated on 13 patients were treated with the Rives technique using a polypropylene mesh while the remaning ten patients had an intraperitoneal Parietex Composite mesh (PC). The two groups were compared for post-operative pain (with VAS) and intra-abdominal pressure (IAP) 48 h after the operation: bladder pressure, length of the procedure, average hospital stay and return to work were calculated. In the Rives group, WDS being equal, the higher IAP values were, the lower was the ratio SAW/WDS; furthermore, SAW/WDS ratio being equal, IAP values were low in cases where intraperitoneal mesh was used. Post-operative pain, measured with VAS, was critical when there was a low SAW/WDS ratio and a high IAP. In our experience, it is possible to predict a strong abdominal wall tension if the SAW/WDA ratio is below 15 mmHg. In these cases it is advisable to use a technique requiring the use of an intraperitoneal mesh. Our experience with PC was so positive that it is used in our department for all cases where an intraperitoneal mesh is required. At present, our proposal is that the SAW/WDS ratio is to be considered as a new parameter in current classifications of incisional hernias. PMID:16172802

Ammaturo, C; Bassi, G

2005-12-01

496

Quantitative surface acoustic wave detection based on colloidal gold nanoparticles and their bioconjugates.  

PubMed

The immobilization scheme of monodispersed gold nanoparticles (10-nm diameter) on piezoelectric substrate surfaces using organosilane molecules as cross