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1

Saw Palmetto  

MedlinePLUS

... June 3, 2010. Saw palmetto. Natural Medicines Comprehensive Database Web site. Accessed at www.naturaldatabase.com on ... Saw palmetto ( Serenoa repens [Bartran] Small). Natural Standard Database Web site. Accessed at www.naturalstandard.com on ...

2

Power saw  

NASA Technical Reports Server (NTRS)

A power saw is disclosed for space or robotic operations with jaw members for clamping to a work piece by an operation of a lever arm. The saw assembly is slidably mounted on the jaw assembly and fed into the work piece by a hand operated feed screw. The saw assembly includes a motor and gear belt. A current sensing circuit provides a current signal which actuates colored lights to visually depict the load on the saw blade during the cutting operations.

Bradley, Jimmy D. (inventor)

1991-01-01

3

Saw palmetto  

MedlinePLUS

... in combination with other herbs, to treat prostate cancer. Some people use saw palmetto for colds and ... prostate infections or chronic pelvic pain syndrome. Prostate cancer. Research studies to date have found that taking ...

4

Sawing Away  

NSDL National Science Digital Library

In this outdoor activity, learners saw sections from fallen trees, then count tree rings and look closely at patterns of tree growth. Learners are challenged to find out if the top of a tree is older, younger, or the same age as the bottom. Learners also explore how patterns of tree growth give clues to environmental conditions over the years.

Science, Lawrence H.

1982-01-01

5

SAW pressure sensors  

Microsoft Academic Search

The design and performance of two types of SAW pressure sensors have been considered. SAW resonator oscillators with metal strip gratings designed for operation at 200 and 360 MHz have been used in both type devices to study the opportunity of the mechanical pressure measurement became of mechanical loading on Rayleigh surface wave propagation. Such electrical characteristics of SAW resonator

I. B. Yarovkin; Yu. N. Vlassov; A. S. Kozlov; N. S. Pashchin

1994-01-01

6

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

7

Safe Chain Saw Operation.  

E-print Network

and below. Do not cut at chest level or above. ? Keep the chain properly sharpened and tensioned. ? Choose a saw with a chain brake, nose guard, antikickback chain and guide bar and other anti kickback devices. Evaluating or "Sizing-up" Trees... bar or cause the trunk to roll toward you. For lim bing, use a lightweight saw with a short guide bar. This eases holding and maneuvering, decreases fatigue and gives you more control in possible kickback situa tions. Stand at such an angle when...

Nelson, Gary S.

1982-01-01

8

A plasmonic SAW transducer.  

PubMed

In this work, an acoustic-optical transducer that is based on the utilization of plasmons is proposed to optically detect SAW of wavelength (<400nm) smaller than the optical wavelength (800nm). Although grating based coupling of plasmons is well known, it has not been applied in the detection of ultrasound. In this work, designs utilizing this operating principle are proposed which can achieve higher changes in reflectivity than those achievable by traditional methods, thus overcoming the traditional difficulties in the detection of very high frequency (10GHz range) SAWs. The proposed device can be fabricated on surfaces at low cost and be used to detect remotely. PMID:25435494

Arca, Ahmet

2015-03-01

9

Rapid SAW Sensor Development Tools  

NASA Technical Reports Server (NTRS)

The lack of integrated design tools for Surface Acoustic Wave (SAW) devices has led us to develop tools for the design, modeling, analysis, and automatic layout generation of SAW devices. These tools enable rapid development of wireless SAW sensors. The tools developed have been designed to integrate into existing Electronic Design Automation (EDA) tools to take advantage of existing 3D modeling, and Finite Element Analysis (FEA). This paper presents the SAW design, modeling, analysis, and automated layout generation tools.

Wilson, William C.; Atkinson, Gary M.

2007-01-01

10

Electric arc saw apparatus  

DOEpatents

A portable, hand-held electric arc saw apparatus comprising a small frame for supporting an electrically conducting rotary blade which serves as an electrode for generating an electric arc between the blade and a workpiece of opposite polarity. Electrically conducting means are provided on said frame for transmitting current to said blade. A pair of freely movable endless belts in the form of crawler treads are employed to facilitate movement of the apparatus relative to the workpiece.

Deichelbohrer, P.R.

1983-08-08

11

SAW sensors for harsh environments  

Microsoft Academic Search

Surface acoustic wave (SAW) sensors are rugged components made on highly stable substrate materials. In addi- tion, by their operating principle they lend themselves to wireless readout by radio signals. For these reasons, they are a first choice for sensing in harsh environments. A review is given on SAW device design, instrumentation of sensor systems, and on the physical interactions

Ulrich Wolff; Franz Ludwig Dickert; Gerhard K. Fischerauer; Wolfgang Greibl; Clemens C. W. Ruppel

2001-01-01

12

SAW correlator spread spectrum receiver  

DOEpatents

A surface acoustic wave (SAW) correlator spread-spectrum (SS) receiver is disclosed which utilizes a first demodulation stage with a chip length n and a second demodulation stage with a chip length m to decode a transmitted SS signal having a code length l=n.times.m which can be very long (e.g. up to 2000 chips or more). The first demodulation stage utilizes a pair of SAW correlators which demodulate the SS signal to generate an appropriate code sequence at an intermediate frequency which can then be fed into the second demodulation stage which can be formed from another SAW correlator, or by a digital correlator. A compound SAW correlator comprising two input transducers and a single output transducer is also disclosed which can be used to form the SAW correlator SS receiver, or for use in processing long code length signals.

Brocato, Robert W

2014-04-01

13

Vapor phase SAW immunoassay sensors  

Microsoft Academic Search

In this paper, we present the results of a series of experiments demonstrating real-time vapor phase detection of cocaine molecules using immunosensors based on surface acoustic wave (SAW) resonators.

D. D. Stubbs; Sang-Hun Lee; W. D. Hunt

2002-01-01

14

Reciprocating Saw for Silicon Wafers  

NASA Technical Reports Server (NTRS)

Concept increases productivity and wafer quality. Cutting wafers from silicon ingots produces smooth wafers at high rates with reduced blade wear. Involves straight reciprocating saw blade and slight rotation of ingot between cutting strokes. Many parallel blades combined to cut many wafers simultaneously from ingot.

Morrison, A. D.; Collins, E. R., Jr.

1985-01-01

15

SAW-Modulated Image Device  

NASA Technical Reports Server (NTRS)

Imaging device uses surface-acoustic-wave (SAW) charge transfer for image readout. Spatial resolution of image changed electronically by changing frequency of applied signal. Surface acoustic waves create traveling longitudinal electric fields. These fields create potential wells that carry along stored charges. Charges injected into wells by photoelectric conversion when light strikes device.

Benz, H. F.

1985-01-01

16

SAW device provides hyperbolic chirp  

Microsoft Academic Search

The 'echo' location system employed by bats utilizes pulses whose frequency varies with time. This system is hyperbolically, rather than linearly weighted. It is pointed out that this concept of hyperbolic weighting, implemented with relatively inexpensive surface accoustic wave (SAW) devices, can be applied to torpedo guidance and satellite interception. The use of hyperbolic weighting allows the use of chirp

R. H. Johnson

1983-01-01

17

SAW and optical signal processing  

Microsoft Academic Search

Even in this digital age, SAW and Optical devices remain indispensable analogue signal processing technologies whose operation and success derive from common wave propagation phenomena. In this review I hope to explain why this is so, and will remain so for the foreseeable future. Historically, the development and exploitation of these technologies arose during the Cold War primarily from the

Meirion Lewis

2005-01-01

18

Reflective array SAW narrowband filters  

Microsoft Academic Search

Experimental results are presented for a reflective-array SAW (surface acoustic wave) device that is optimized for narrowband filter applications. The filter consists of broadband input and output transducers with two weighted reflector arrays. Previous devices of this type have used reflective dot density and depth profile weighting for the reflective arrays. A unique implementation of this design technique for a

S. Gopani; R. B. Brown; J. H. Hines; B. H. Horine

1990-01-01

19

Improved table-saw guard  

NASA Technical Reports Server (NTRS)

Guard makes lighter contact on materials being sawed. Cuts are better controlled, and damages to fragile foam-type materials are reduced. Overhead support makes it possible to perform slot and step cuts, and thick materials are pushed under guard with less force. Guard is transparent plastic enclosure held by side-attached overhead support arm.

Dunn, B. R.; Zebus, P. P.

1980-01-01

20

SAW and pseudo-SAW properties using matrix methods  

Microsoft Academic Search

Pseudo-surface-waves (PSAW's), or leaky SAW's, were first recognized over 25 years ago and the phase velocity (vp) and attenuation per wavelength (??) of PSAW modes for nonpiezoelectrics were calculated soon after. Since the seventies progress has been made in exploiting the higher velocities and electromechanical coupling constants (K2=2?v\\/v) achievable with PSAW's for piezoelectric device applications; this has stimulated new interest

Eric L. Adler

1994-01-01

21

Precision surface-acoustic-wave (SAW) oscillators  

Microsoft Academic Search

The evolution of SAW oscillator technology over the past 17 years is described and a review of the current state of the art for high-performance SAW oscillators is presented. This review draws heavily upon the authors' own experience and efforts, which have focused upon the development of a wide variety of SAW oscillators in response to numerous high-performance military system

THOMAS E. PARKER; GARY K. MONTRESS

1988-01-01

22

SAW-based radio sensor systems  

Microsoft Academic Search

Abstract—Surface acoustic wave (SAW) devices can be used as identification and sensor elements (SAW transponders) for mea- suring physical quantities such as temperature, pressure, torque, acceleration, humidity, etc., that do not need any power supply and may,be accessed wirelessly. The complete wireless sensor system consists of such a SAW transponder and a local radar transceiver. An RF burst transmitted by

Leonhard M. Reindl; Alfred Pohl; Gerd Scholl; Robert Weigel

2001-01-01

23

SAW devices as wireless passive sensors  

Microsoft Academic Search

Surface acoustic wave (SAW) radio sensors make it possible to read measurement values from a remote location. The decisive advantage of these SAW sensors lies in their passive operation with no need for a separate power supply, and in the possibility of wireless installation at particularly inaccessible locations. The passive SAW sensors are maintenance free. The physical or chemical properties

L. Reindl; G. Scholl; T. Ostertag; C. C. W. Ruppel; W.-E. Bulst; F. Seifert

1996-01-01

24

Remote sensor system using passive SAW sensors  

Microsoft Academic Search

The aim of this paper is to show the possibilities of combining the basic principles of SAW identification (ID) tags with the well known properties of SAW sensors. The concept of SAW ID-sensors created in this way has several advantages over other solutions with the most two important being that the sensors themselves do not require a separate energy source

W. Buff; F. Plath; O. Schmeckebier; M. Rusko; T. Vandahl; H. Luck; F. Moller; D. C. Malocha

1994-01-01

25

CDMA for wireless SAW sensor applications  

Microsoft Academic Search

A well known spread spectrum technique is used to get the sensor information from an individually addressed SAW sensor. Coded ID tag type and BPSK type SAW sensors are picked out of a number of sensors by correlating the received signal with the known code of a particular sensor. The ID-tag type and BPSK-coded SAW sensor's function is observed as

G. Ostermayer; A. Pohl; C. Hausleitner; L. Reindl; F. Seifert

1996-01-01

26

Reconstructing see-saw models  

SciTech Connect

In this talk we discuss the prospects to reconstruct the high-energy see-saw Lagrangian from low energy experiments in supersymmetric scenarios. We show that the model with three right-handed neutrinos could be reconstructed in theory, but not in practice. Then, we discuss the prospects to reconstruct the model with two right-handed neutrinos, which is the minimal see-saw model able to accommodate neutrino observations. We identify the relevant processes to achieve this goal, and comment on the sensitivity of future experiments to them. We find the prospects much more promising and we emphasize in particular the importance of the observation of rare lnic decays for the reconstruction of the right-handed neutrino masses.

Ibarra, Alejandro [Instituto de Fisica Teorica, CSIC/UAM, C-XVI, Cantoblanco, 28049 Madrid (Spain)

2007-01-12

27

SAW device provides hyperbolic chirp  

NASA Astrophysics Data System (ADS)

The 'echo' location system employed by bats utilizes pulses whose frequency varies with time. This system is hyperbolically, rather than linearly weighted. It is pointed out that this concept of hyperbolic weighting, implemented with relatively inexpensive surface accoustic wave (SAW) devices, can be applied to torpedo guidance and satellite interception. The use of hyperbolic weighting allows the use of chirp by reducing the nonlinearity of the Doppler shift. The use of a hyperbolically weighted chirp (HWC) provides an approach for substantially overcoming a problem caused by the Doppler effect. The block diagram of a typical spread spectrum detection, tracking, and homing system is presented. This system uses a nonlinearly weighted SAW device as a spectrum spreader and compressor.

Johnson, R. H.

1983-11-01

28

Frequency Domain Modeling of SAW Devices  

NASA Technical Reports Server (NTRS)

New SAW sensors for integrated vehicle health monitoring of aerospace vehicles are being investigated. SAW technology is low cost, rugged, lightweight, and extremely low power. However, the lack of design tools for MEMS devices in general, and for Surface Acoustic Wave (SAW) devices specifically, has led to the development of tools that will enable integrated design, modeling, simulation, analysis and automatic layout generation of SAW devices. A frequency domain model has been created. The model is mainly first order, but it includes second order effects from triple transit echoes. This paper presents the model and results from the model for a SAW delay line device.

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

2007-01-01

29

Triviality and the (Supersymmetric) See-Saw  

E-print Network

For the D=5 Majorana neutrino mass operator to have a see-saw ultraviolet completion that is viable up to the Planck scale, the see-saw scale is bounded above due to triviality limits on the see-saw couplings. For supersymmetric see-saw models, with realistic neutrino mass textures, we compare constraints on the see-saw scale from triviality bounds, with those arising from experimental limits on induced charged-lepton flavour violation, for both the CMSSM and for models with split supersymmetry.

Bruce A. Campbell; David W. Maybury

2006-03-07

30

UHF SAW Resonators and Applications  

Microsoft Academic Search

Surface acoustic wave (SAW) resonators suitable for systems applications are being produced in our laboratory at frequencies as high as 1.43 GHz. These two-port single-pole devices, which have distortionless response characteristics and high Q values [Q >-lO,400\\/F(GHz)l may be used to stabilize UHF oscil!l!ators or as narrowband filters. These resonators have the advantages of small size, low matched insertion loss

William J. Tanski

1980-01-01

31

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

32

Minimal Dynamical Inverse See Saw  

E-print Network

We present a minimal model in which the Inverse See Saw is realized dynamically. The two unity lepton number breaking term is induced at two-loop level and is naturally around the keV scale, while right-handed neutrinos are at the TeV scale. An interesting extension of the model is obtained by gauging B-L: in this case anomaly cancellation has as direct consequence the presence of a sterile neutrino at the MeV scale that may be a good Dark Matter candidate. Moreover the new gauge boson Z' and the new neutral scalars may have characteristic signatures at LHC.

F. Bazzocchi

2010-11-29

33

Prototype arc saw design and cutting trials  

SciTech Connect

A program was initiated to develop the arc saw as a tool capable of removing the end fittings from spent nuclear fuel bundles. A special arc saw for this purpose was designed, installed at the Pacific Northwest Laboratory and satisfactorily operated to remove end fittings from simulated, nonradioactive fuel bundles. The design of the arc saw included consideration of the cutting environment, power supply size, control equipment, and work piece size. Several simulated fuel bundles were cut to demonstrate that the arc saw met design specifications. Although the arc saw development program was curtailed before significant performance data could be collected, tests indicate that the arc saw is a good means of cropping spent fuel bundles and is well suited to remote operation and maintenance.

Allison, G.S.

1980-09-01

34

Programmable reflectors for SAW-ID-tags  

Microsoft Academic Search

Surface acoustic wave devices for identification systems (SAW-ID-tags or SAW wireless labels) have a large potential for future applications. We concentrate in this paper on reflective SAW-ID-tags with amplitude modulation. We use splitfinger interdigital transducers as reflecting structures. If the transducers are short circuited or capacitively loaded the reflection disappears almost entirely. On the other hand, if an open circuit

L. Reindl; W. Ruile

1993-01-01

35

Skeletal trauma from chain-saw injuries.  

PubMed

Some of the radiologic features of chain-saw injuries are described. These occurred in an industrial logging community, where the use of such machines is common. The increasing availability of chain saws for domestic use makes it likely that accident and emergency departments will be seeing a wide variety of injuries following accidents with chain saws. The radiologic appearances include the chipping of bone, the breaching of joint cavities, and partial severing of tubular bones. PMID:6122742

Verow, P W

1982-04-01

36

Saw palmetto ethanol extract inhibits adipocyte differentiation.  

PubMed

The fruits of saw palmetto have been used for the treatment of a variety of urinary and reproductive system problems. In this study we investigated whether the fruit extracts affect in vitro adipogenesis. Saw palmetto ethanol extract inhibited the lipid droplet accumulation by induction media in a dose-dependent manner, and it also attenuated the protein expressions of C-EBP? and PPAR?. Phosphorylation of Erk1/2 and Akt1 were also decreased by saw palmetto ethanol extract. This report suggests that saw palmetto extracts selectively affect the adipocyte differentiation through the modulation of several key factors that play a critical role during adipogenesis. PMID:23179316

Villaverde, Nicole; Galvis, Adriana; Marcano, Adriana; Priestap, Horacio A; Bennett, Bradley C; Barbieri, M Alejandro

2013-07-01

37

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

Code of Federal Regulations, 2013 CFR

...shall mean a machine equipped with an endless steel band having a continuous series of notches or teeth, running over wheels or pulleys, and used for sawing materials. Chain saw shall mean a machine that has teeth linked together to form an endless...

2013-07-01

38

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

Code of Federal Regulations, 2014 CFR

...shall mean a machine equipped with an endless steel band having a continuous series of notches or teeth, running over wheels or pulleys, and used for sawing materials. Chain saw shall mean a machine that has teeth linked together to form an endless...

2014-07-01

39

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

Code of Federal Regulations, 2011 CFR

...shall mean a machine equipped with an endless steel band having a continuous series of notches or teeth, running over wheels or pulleys, and used for sawing materials. Chain saw shall mean a machine that has teeth linked together to form an endless...

2011-07-01

40

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

Code of Federal Regulations, 2012 CFR

...shall mean a machine equipped with an endless steel band having a continuous series of notches or teeth, running over wheels or pulleys, and used for sawing materials. Chain saw shall mean a machine that has teeth linked together to form an endless...

2012-07-01

41

[Who saw them the first?].  

PubMed

From the theory of Girolamo Fracastoro in 1530, suggesting the participation of invisible seeds in the contagion of some diseases, to the universal genius Athanasius Kircher, who saw little worms in the blood of patients suffering from plague in 1659 and the final discovery of Anthony Van Leeuwenhoek in 1674, the existence of bacteria was surely in the mind of a few investigators. Kirchner, who seems to be the winner of this race, did not give any special meaning to his observations. Leeuwenhoek, instead, was deeply concerned about the importance of his discovery in the field of biology, but was unable to establish a link between these animalcula and human epidemic diseases. PMID:23096478

Ledermann, Walter

2012-06-01

42

Sawing a Local Bedrock Specimen  

NSDL National Science Digital Library

In this activity students bring in samples of local rocks for the teacher to cut in half with a diamond saw. Students then analyze and report on the grain relationships within the rock. As a follow-up activity students can exchange rocks, write an analysis of the sawn sample, and compare notes. In cases where disagreements cannot be resolved, the teacher should offer a third analysis of the sample. Also students can take the rocks home and tell their parents what they learned about the particular sample. Or they can set up before-and-after displays showing cut and uncut samples. Enlarged poster-size diagrams of the more interesting samples can be created. The specific details of texture and composition can be labeled with a string or wire running to the appropriate spot on the specimen.

43

Apparatus for loading a band saw blade  

DOEpatents

A band saw blade is loaded between pairs of guide wheels upon tensioning the blade by guiding the blade between pairs of spaced guide plates which define converging slots that converge toward the guide wheels. The approach is particularly useful in loading blades on underwater band saw machines used to cut radioactive materials. 2 figs.

Reeves, S.R.

1990-03-20

44

SAW Temperature Sensor and Remote Reading System  

Microsoft Academic Search

A system for remotely reading a SAW temperature sensor has been adapted from an existing, commercially available personnelherchandise detector system. The SAW sensor is a Lithium Niobate wafer with an inter-digital transducer (IDT) which is directly connected to a small transducer which is directly connected to a small microwave antenna and two reflectors. The reading system is a special Fhl

X. Q. Bao; W. Burkhard; V. V. Varadan; V. K. Varadan

1987-01-01

45

Numerical methods for SAW propagation characterization  

Microsoft Academic Search

Due to more and more stringent requirements on SAW filter performance, it is mandatory to precisely characterize the SAW propagation characteristics as a function of manufacturing variations (metal thickness, mark-to-space ratio, etc.). Several authors have already proposed experimental characterizations using sets of test devices. One of the main difficulties of this experimental approach is the accuracy of both the geometrical

P. Ventura; J. M. Hode; M. Solal; J. Desbois; J. Ribbe

1998-01-01

46

Comparison between BAW and SAW sensor principles  

Microsoft Academic Search

A comparison is given between piezoelectrically excited bulk acoustic wave (BAW) and surface acoustic wave (SAW) elements with respect to their primary sensitivity functions and principal capabilities for sensor applications. The importance of mode purity for high dynamic range sensors is emphasized. Characteristic sensor examples are reviewed, and the special demands on the electronics for BAW and SAW elements in

Ewald Benes; M. Groschl; F. Seifert; A. Pohl

1998-01-01

47

Narrowband SAW filters for IF applications  

Microsoft Academic Search

The general concerns of narrowband surface acoustic wave (SAW) filtering are reviewed. The specific characteristics of each approach are discussed. The application of these filters in particular IF subsystems such as an anti-jam modem, a satellite transponder, and a direction finder is studied. It is found that SAW filters can be used in a wide variety of narrowband IF applications.

B. Horine

1990-01-01

48

Apparatus for loading a band saw blade  

DOEpatents

A band saw blade is loaded between pairs of guide wheels upon tensioning the blade by guiding the blade between pairs of spaced guide plates which define converging slots that converge toward the guide wheels. The approach is particularly useful in loading blades on underwater band saw machines used to cut radioactive materials.

Reeves, Steven R. (49 Williams Ave., West Valley, NY 14171)

1990-01-01

49

Microscopic Saw Mark Analysis: An Empirical Approach.  

PubMed

Microscopic saw mark analysis is a well published and generally accepted qualitative analytical method. However, little research has focused on identifying and mitigating potential sources of error associated with the method. The presented study proposes the use of classification trees and random forest classifiers as an optimal, statistically sound approach to mitigate the potential for error of variability and outcome error in microscopic saw mark analysis. The statistical model was applied to 58 experimental saw marks created with four types of saws. The saw marks were made in fresh human femurs obtained through anatomical gift and were analyzed using a Keyence digital microscope. The statistical approach weighed the variables based on discriminatory value and produced decision trees with an associated outcome error rate of 8.62-17.82%. PMID:25399533

Love, Jennifer C; Derrick, Sharon M; Wiersema, Jason M; Peters, Charles

2014-11-14

50

SAW based systems for mobile communications satellites  

NASA Technical Reports Server (NTRS)

Modern mobile communications satellites, such as INMARSAT 3, EMS, and ARTEMIS, use advanced onboard processing to make efficient use of the available L-band spectrum. In all of these cases, high performance surface acoustic wave (SAW) devices are used. SAW filters can provide high selectivity (100-200 kHz transition widths), combined with flat amplitude and linear phase characteristics; their simple construction and radiation hardness also makes them especially suitable for space applications. An overview of the architectures used in the above systems, describing the technologies employed, and the use of bandwidth switchable SAW filtering (BSSF) is given. The tradeoffs to be considered when specifying a SAW based system are analyzed, using both theoretical and experimental data. Empirical rules for estimating SAW filter performance are given. Achievable performance is illustrated using data from the INMARSAT 3 engineering model (EM) processors.

Peach, R. C.; Miller, N.; Lee, M.

1993-01-01

51

3. AERIAL VIEW OF SAW MILL RIVER CULVERT. NEPPERHAN AVENUE ...  

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

3. AERIAL VIEW OF SAW MILL RIVER CULVERT. NEPPERHAN AVENUE IS AT LEFT, SLIGHTLY FILLED SAW MILL RIVER CULVERT IS ON RIGHT. - Old Croton Aqueduct, Saw Mill River Culvert, Spanning Nepperhan Avenue, Yonkers, Westchester County, NY

52

28. William E. Barrett, Photographer, August 1975. TRIMMER SAWS FOR ...  

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

28. William E. Barrett, Photographer, August 1975. TRIMMER SAWS FOR CUTTING BOARDS TO LENGTH. SAWS IN FOREGROUND REMOVED. NOTE BELT DRIVE ON REMAINING SAW. - Meadow River Lumber Company, Highway 60, Rainelle, Greenbrier County, WV

53

27. William E. Barrett, Photographer, August 1975. TRIMMER SAWS LOOKING ...  

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

27. William E. Barrett, Photographer, August 1975. TRIMMER SAWS LOOKING BACK FROM SORTING DOCK. SAW BLADES ARE HIDDEN BY HINGED PARTITION. SPIRAL ROLLERS CARRY BOARDS FROM SAWS TO HANDLES. - Meadow River Lumber Company, Highway 60, Rainelle, Greenbrier County, WV

54

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

Code of Federal Regulations, 2010 CFR

...continuous series of notches or teeth, running over wheels or pulleys, and used for sawing materials. (6) The term guillotine...continuous series of notches or teeth, running over wheels or pulleys, and used for sawing materials. Chain saw shall...

2010-07-01

55

Parameterizable Library Components for SAW Devices  

NASA Technical Reports Server (NTRS)

To facilitate quick fabrication of Surface Acoustic Wave (SAW) sensors we have found it necessary to develop a library of parameterizable components. This library is the first module in our strategy towards a design tool that is integrated into existing Electronic Design Automation (EDA) tools. This library is similar to the standard cell libraries found in digital design packages. The library cells allow the user to input the design parameters which automatically generate a detailed layout of the SAW component. This paper presents the results of our development of parameterizable cells for an InterDigitated Transducer (IDT), reflector, SAW delay line, and both one and two port resonators.

Wilson, William C.; Atkinson, Gary M.

2006-01-01

56

Versatile machine mills, saws light materials  

NASA Technical Reports Server (NTRS)

Versatile milling/sawing machine performs angle cuts, flat and profile milling, machining of grooves and slots, and edge trimming of phenolic panels. The machine is mounted on rails above a table equipped with vacuum capability for holding workpieces.

Rauschl, J. A.

1966-01-01

57

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

58

Using SAW Resonators in RF Oscillators  

NASA Technical Reports Server (NTRS)

Surface-acoustic-wave (SAW) resonators used as frequency-determining elements in radio-frequency oscillators circuits. Oscillators are frequencymodulated, phase-modulated, or pulse-modulated. SAW resonators are especially applicable to low-power subminiature applications, such as biotelemetry and wind-tunnel instrumentation, where they advantageously replace crystals. Resonators are smaller than crystals and very thin--advantage where small package size is important.

Westbrook, R. M.; Deboo, G. J.

1983-01-01

59

Tunable Variable Bandwidth\\/Frequency SAW Resonators  

Microsoft Academic Search

A SAW resonator device is demonstrated such that 3 dB fractional bandwidths of .l% to .05% can be achieved in the same device prior to implementation of input\\/output matching networks. Such matching networks have a deleterious effect on shape factor and out-ofband rejection. The technique used is one in which two or more resonant SAW cavities are acoustically coupled in-line

Jeff Stuart Schoenwald; Teledyne HEC

1977-01-01

60

New architectures for feedthrough SAW recursive devices.  

PubMed

This paper presents an analysis of a new type of feedthrough recursive surface acoustic wave (SAW) device. The device combines a conventional SAW structure with positive feedback in a way that allows use of selective properties of the SAW structure, control of the central frequency and bandwidth, achieving significantly higher quality factors for given dimensions of the structure, and reduction of the sidelobe level. Several possible implementations are discussed from a simple one that uses external circuitry to the most advanced that includes digital supervisory control. Equations are presented that relate the central frequency, bandwidth, and sidelobe level to the parameters of the SAW structure and feedback loop. The simulation results were found to be in good agreement with experimental data. These data show the control of the central frequency within 1%, a 10-fold increase in the quality factor compared to the original SAW structure, and a reduction of the side-lobe level by 20 dB irrespective of the influence of second order effects and random manufacturing fluctuations. PMID:15742568

Kalashnikov, Alexander N; Challis, Richard E

2005-01-01

61

STP Random Walk 2D SAW Program  

NSDL National Science Digital Library

The RandomWalkSAW program simulates a self-avoiding random walk in two dimensions. The walker has an equal probability of going in any direction, but cannot return to a site that has already been visited. The default number of initial walkers is 100 and the total number of steps N = 1024. RandomWalkSAW is part of a suite of Open Source Physics programs that model aspects of Statistical and Thermal Physics (STP). The program is distributed as a ready-to-run (compiled) Java archive. Double clicking the stp RandomWalkSAW.jar file will run the program if Java is installed on your computer. Additional programs can be found by searching ComPADRE for Open Source Physics, STP, or Statistical and Thermal Physics.

Gould, Harvey; Tobochnik, Jan; Christian, Wolfgang; Cox, Anne

2008-10-10

62

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

63

Wideband low loss double mode SAW filters  

Microsoft Academic Search

A method is discussed for achieving a wideband low-loss longitudinally coupled double mode surface acoustic wave (SAW) (DMS) filter using a leaky SAW on a 36° Y-X LiTaO3 and 64° Y-X LiNbO3 substrate with a high electromechanical coupling factor. Its characteristics are analyzed by computer simulation. With the use of the first-mode and third-mode resonance on a 64° Y-X LiNbO3

Takao Morita; Y. Watanabe; M. Tanaka; Y. Nakazawa

1992-01-01

64

See-saw and grand unification  

E-print Network

I review the profound connection between the see-saw mechanism for neutrino masses and grand unification. This connection points naturally towards SO(10) grand unified theory. The emphasis here is on the supersymmetric theory, but I also discuss salient features of its split supersymmetry version and ordinary non-supersymmetric SO(10). Particular attention is paid to the crucial issue of the minimal such theory, i.e. the question of the Higgs sector needed to break SO(10) down to the Minimal Supersymmetric Standard Model or the Standard Model. Some essential features of the see-saw mechanism are clarified, in particular its precise origin at the high scale.

Goran Senjanovic

2005-01-26

65

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

66

Direct Phase Noise Measurements of SAW Resonators  

Microsoft Academic Search

The most significant contribution of SAW resonators is in the frequency control of low phase noise oscillators at UHF frequencies. Techniques for measuring the phase noise of oscillators are well known, but the contribution to that phase noise of the frequency determining element is usually estimated or found by indirect methods. We present a method for directly measuring the phase

Scott S. Elliott; Robert C. Bray

1984-01-01

67

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

68

A review of wireless SAW sensors  

Microsoft Academic Search

Wireless measurement systems with passive surface acoustic wave (SAW) sensors offer new and exciting perspectives for remote monitoring and control of moving parts, even in harsh environments. This review paper gives a comprehensive survey of the present state of the measurement systems and should help a designer to find the parameters required to achieve a specified accuracy or uncertainty of

Alfred Pohl

2000-01-01

69

Surface acoustic waves and SAW materials  

Microsoft Academic Search

Material parameters necessary for optimum design of surface-acoustic-wave (SAW) devices are reviewed. Velocity, coupling coefficient, power flow angle, temperature coefficients, propagation loss (including air loading, diffraction, and beam steering), and equivalent circuit parameters are considered. A brief introduction to the nature of surface waves is followed by sufficient theoretical information to allow full understanding and derivation of the properties and

1976-01-01

70

An Alternative to See-Saw  

E-print Network

We give a new mechanism for generating very small, and almost degenerate, neutrino masses, without resorting to the see-saw mechanism or unnatural small Yukawa couplings. It requires the existence of at least 4 families with an almost democratic structure for the Yukawa couplings. It is also proven that this structure can account for large lepton mixings of the three light leptons.

J. I. Silva-Marcos

1998-11-18

71

Improved Multiple-DOF SAW Piezoelectric Motors  

NASA Technical Reports Server (NTRS)

Surface-acoustic-wave (SAW) piezoelectric motors of a proposed type would be capable of operating in multiple degrees of freedom (DOFs) simultaneously and would be amenable to integration into diverse structures and mechanisms. These motors would be compact and structurally simple and would not contain bearings or lead screws. One example of a particularly useful motor of this type would be a two-dimensional- translation stage. Another such example would be a self-actuated spherical joint that could be made to undergo controlled, simultaneous rotations about two orthogonal axes: Such a motor could serve as a mechanism for aiming an "eyeball" camera or as a compact transducer in, and an integral part of, a joint in a robot arm. The multiple-DOF SAW piezoelectric motors as now proposed would be successors to the ones reported in "Multiple-DOF Surface-Acoustic-Wave Piezoelectric Motors" (NPO-20735), NASA Tech Briefs, Vol. 24, No. 12 (December 2000), page 5b. The basic principle of operation of a multiple-DOF SAW piezoelectric motor is a straightforward extension of that of single-DOF SAW piezoelectric motors, which have been reported in several previous NASA Tech Briefs articles: For example, in the case of a linear SAW piezoelectric motor, piezoelectric transducers at opposite ends of a stator excite surface acoustic waves that travel along the surface of the stator. An object (denoted the slider) is pressed against the stator with sufficient pressure (in practice .300 MPa) that it remains in frictional contact with the stator at all times. The slider rides the crests of the waves and is thereby made to move along the surface of the stator. The direction of motion (forward or backward) is controlled by selecting the relative phase of waves generated by the two piezoelectric transducers. The speed increases with the amplitude of the waves and thus with the magnitude of the voltage applied to the transducers.

Bar-Cohen, Yoseph; Bao, Xiaoqi; Hull, Anthony; Wright, John

2003-01-01

72

8. GENERAL VIEW OF SHINGLE CUTTING SAWS THAT HANDLE BOLTS ...  

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

8. GENERAL VIEW OF SHINGLE CUTTING SAWS THAT HANDLE BOLTS AFTER DEBARKING; AFTER DEBARKING THE BOLTS ARE SENT TO THE SHINGLE WEAVER FOR SAWING - Lester Shingle Mill, 1602 North Eighteenth Street, Sweet Home, Linn County, OR

73

3. ELEVATION OF THE OAK VIADUCT, LOOKING NORTH ON SAW ...  

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

3. ELEVATION OF THE OAK VIADUCT, LOOKING NORTH ON SAW MILL RUN BOULEVARD - Pittsburgh & Castle Shannon Railroad, Oak Viaduct, Overbrook Trolley Line, crossing Saw Mill Run Boulevard & Colerain Street, Pittsburgh, Allegheny County, PA

74

15. Basement level of Saw Mill looking northeast into the ...  

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

15. Basement level of Saw Mill looking northeast into the turbine pit. Headrace for the Grist Mill is beyond the wall to the right. - Sugar River Grist Mill & Saw Mill, 159 Main Street, Claremont, Sullivan County, NH

75

32. TRIM SAWS IN BACKGROUND, VIEW FROM SOUTH WEST. NOTE ...  

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

32. TRIM SAWS IN BACKGROUND, VIEW FROM SOUTH WEST. NOTE WASTE CONVEYOR IN FOREGROUND, CANT ROLL CASE TO BEAM SAW, THEN ROLL CASE FROM EDGER IN MIDDLE GROUND. - Hull-Oakes Lumber Company, 23837 Dawson Road, Monroe, Benton County, OR

76

Fiber Quality Properties Produced by Saw-type Lint Cleaners  

Technology Transfer Automated Retrieval System (TEKTRAN)

The saw-type lint cleaner is the work horse of the ginning industry in lint cleaning. A study was conducted over a two-year period to examine the performance of a saw-type lint cleaner in response to feed rate, saw speed, combing ratio, variety and moisture effects. The study found that moisture c...

77

SAW devices for military communications, radar, and EW systems  

Microsoft Academic Search

A review of the principles and applications of surface acoustic wave (SAW) devices is presented. Most SAW devices have been developed for use in the VHF and UHF bands (30 to 1000 MHz), and are limited at low frequencies by the size and cost of the substrates and at high frequencies by photolithographic resolution. A primary feature of the SAW

C. S. Hartmann; R. J. Kansy; W. D. Daniels; B. R. Potter

1982-01-01

78

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

79

See-saw Enhancement of Lepton Mixing  

E-print Network

The see-saw mechanism of neutrino mass generation may enhance lepton mixing up to maximal even if the Dirac mass matrices of leptons have structure similar to that in the quark sector. Two sets of conditions for such an enhancement are found. The first one includes the see-saw generation of heavy Majorana masses for right-handed neutrinos and a universality of Yukawa couplings which can follow from the unification of neutrinos with new superheavy neutral leptons. The second set is related to lepton number symmetry of the Yukawa interactions in the Dirac basis of neutrinos. Models which realize these conditions have strong hierarchy or strong degeneration of Majorana masses of the right-handed neutrinos.

Alexei Yu. Smirnov

1993-04-02

80

SO(10)-Inspired See-Saw Mechanism  

E-print Network

We determine the nu_{R} Majorana mass matrix from the experimental data on neutrino oscillations in the framework of a see-saw SO(10) model, where we impose the condition (M^R)_{33} = 0 to avoid too large fine-tunings in the see-saw formula. We find a class of solutions with the two lowest neutrino masses almost degenerate and the scale of the matrix elements of M^R in the range 10^{11} -10^{12} GeV in agreement with Pati-Salam intermediate symmetry. We find also solutions with smaller neutrino masses, for which the scale of M_R depends on the solution to the "solar neutrino problem" and on the value of the component of \

M. Abud; F. Buccella

2000-06-02

81

Neutrino See-Saw Triviality And Lepton Flavour Violation  

E-print Network

For the D=5 Majorana neutrino mass operator to have a see-saw ultraviolet completion that is viable up to the Planck scale, the see-saw scale is bounded above due to triviality limits on the see-saw couplings. For supersymmetric see-saw models, with realistic neutrino mass textures, we compare constraints on the see-saw scale from triviality bounds, with those arising from experimental limits on induced charged-lepton flavour violation, for both the CMSSM and for models with split supersymmetry.

Bruce A. Campbell; David W. Maybury

2006-05-12

82

Coagulopathy induced by saw palmetto: a case report.  

PubMed

Saw palmetto is the most popular herbal supplement used to treat symptoms of benign prostatic hyperplasia (BPH). The safety and efficacy of saw palmetto has been established in the literature. While the majority of studies document the efficacy and safety of saw palmetto, some studies document the adverse side effects, including increased risk of bleeding. There are no reports in the literature about increased prothombin time (PT), partial thromboplastin time (PTT) or international normalized ratio (INR) while using saw palmetto. We present a case of hematuria and coagulopathy in a patient who was using saw palmetto. PMID:20120986

Villanueva, Salvador; González, Jenniffer

2009-01-01

83

Microsystem packaging of an RF SAW correlator.  

SciTech Connect

An electrically programmable surface acoustic wave (SAW) correlator was recently completed from design through small scale production in support of low power space-based communications for NASA. Three different versions of this RF microsystem were built to satisfy design requirements and overcome packaging and system reliability related issues. Flip-chip packaging and conventional thick film hybrid assembly techniques are compared in the fabrication of this microsystem.

Palmer, David A.; Brocato, Robert Wesley; Studor, George F.

2005-01-01

84

Saw Palmetto for Benign Prostatic Hyperplasia  

Microsoft Academic Search

In this double-blind trial, we randomly assigned 225 men over the age of 49 years who had moderate-to-severe symptoms of benign prostatic hyperplasia to one year of treatment with saw palmetto extract (160 mg twice a day) or placebo. The pri- mary outcome measures were changes in the scores on the American Urological Association Symptom Index (AUASI) and the maximal

Stephen Bent; Christopher Kane; Katsuto Shinohara; John Neuhaus; Esther S. Hudes; Harley Goldberg; Andrew L. Avins

2006-01-01

85

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

86

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

87

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

88

Investigation of Cutting Forces in Concrete Sawing Process  

Microsoft Academic Search

Diamond saw blades are widely used in cutting concrete materials in civil engineering industry. Concrete is a kind of difficult-to-cut composite material. The cutting forces in concrete cutting processes by single-diamond tools and sawing processes by cir cular diamond blade were investigated in this paper to provide basic information for properly sel ecting sawing conditions and optimizing blade structure. The

Xin Wei; H. W. Du; Chao Yuan Wang; Y. L. Fang

2003-01-01

89

Oberflächenmodifikation von Surface Acoustic Wave (SAW) Biosensoren für biomedizinische Anwendungen.  

E-print Network

??Im Rahmen dieser Arbeit wurden Oberflächenfunktionalisierungen für Surface Acoustic Wave (SAW) Sensoren entwickelt, die deren Anwendung im biomedizinischen Bereich ermöglichen sollten. Im Fokus der Arbeit… (more)

Gruhl, Friederike J.

2010-01-01

90

Programmable SAW development :Sandia/NASA project final report.  

SciTech Connect

This report describes a project to develop both fixed and programmable surface acoustic wave (SAW) correlators for use in a low power space communication network. This work was funded by NASA at Sandia National Laboratories for fiscal years 2004, 2003, and the final part of 2002. The role of Sandia was to develop the SAW correlator component, although additional work pertaining to use of the component in a system and system optimization was also done at Sandia. The potential of SAW correlator-based communication systems, the design and fabrication of SAW correlators, and general system utilization of those correlators are discussed here.

Brocato, Robert Wesley

2004-10-01

91

Table saw injuries: epidemiology and a proposal for preventive measures  

PubMed Central

Background Table saws are ubiquitous equipment in professional, home, and school woodshops that have the potential to cause severe injuries. Many of these injuries results in finger and thumb tendon, nerve, and vascular damage or amputation. Long-term outcomes of these injuries can include functional and sensory deficits. Table saw manufacturers are required to equip saws with blade guards to prevent blade contact, but despite these measures, table saw injuries are a common occurrence in US emergency departments. Methods We performed a literature search using PubMed and the Cumulative Index to Nursing and Allied Health Literature to compile epidemiology data relevant to table saw injuries. We also reviewed the US Consumer Product Safety Commission’s briefing package on table saw blade contact injuries. Results Over 30,000 table saw injuries occur annually. Fingers and hands are the most frequently injured body part and lacerations are the most common injury. Individuals suffering from occupational injuries tend to be younger than those injured during amateur woodworking. A small, but important minority of injuries are to students participating in school shop classes. Medical costs for the treatment of table saw injuries are estimated at more than $2 billion every year. Conclusions SawStop technology stops the saw blade when contact with skin is made, resulting in a small cut, rather than a more complicated laceration or amputation. The application of this novel technology in saw designs can prevent serious injuries that deleteriously affect lives at the personal and societal levels. Level of Evidence III PMID:24165629

Chung, Kevin C.; Shauver, Melissa J.

2014-01-01

92

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

93

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

94

Discriminating Neutrino See-Saw Models  

E-print Network

We consider how well current theories can predict neutrino mass and mixing parameters, and construct a statistical discriminator which allows us to compare different models to each other. As an example we consider see-saw models based on family symmetry, and single right-handed neutrino dominance, and compare them to each other and to the case of neutrino anarchy with random entries in the neutrino Yukawa and Majorana mass matrices. The predictions depend crucially on the range of the undetermined coefficients over which we scan, and we speculate on how future theories might lead to more precise predictions for the coefficients and hence for neutrino observables. Our results indicate how accurately neutrino masses and mixing angles need to be measured by future experiments in order to discriminate between current models.

M. Hirsch; S. F. King

2001-02-08

95

Recycling SAW slag proves reliable and repeatable  

SciTech Connect

Submerged arc welding (SAW) slag is recycled by taking the fused part of the slag after welding and processing it in a manner that allows it to be reused for the same SAW operation. This slag recycling process has been around the welding industry for many years, and trial-and-error experimentation through the years has made it a reliable and accepted process. Two major reasons why a welding manufacturer would consider the use of recycled submerged arc welding slag are cost savings and the environment. The cost of processing recycled slag is less than the purchase of new flux from the manufacturer. Many times this can amount to savings of 50% or greater. Savings can also be realized by eliminating the need to collect the slag and have it removed to an approved landfill. Environmentally, recycling slag minimizes the use of nonrenewable resources such as minerals, and it reduces the mass of material that must be sent to a landfill. It should be noted, though, that in most recycling processes there is some loss in weight, and not all the slag is processed into reusable flux. Also, there is magnetic separation during processing in which magnetic impurities are removed and disposed of as waste. An average for this loss is 25% of the total weight processed. To realize all of the advantages of recycling, it is essential that the process is performed properly and according to the standards established by industry. Below are steps required for recycling slag as established by two standards setting organizations.

Beck, H.P.; Jackson, A.R. [Harbert`s Products, Inc., Greencastle, PA (United States)

1996-06-01

96

INTRODUCTION TO MACHINING 1.4 METAL CUTTING BAND SAWS  

E-print Network

. Cutting speeds are always a function of the type of blade being used (number of teeth per inch [tpi blade types and cutting speeds: Band saw blades are defined by the "number of teeth per inch" (TPI and equipped with an "average" TPI blade of "average" width. TPI: -for soft and/or thin materials use band saw

Sun, Yu

97

PC software for SAW propagation in anisotropic multilayers  

Microsoft Academic Search

A software package that provides an interactive and graphical environment for surface acoustic wave (SAW) and plate-mode propagation studies in arbitrarily oriented anisotropic and piezoelectric multilayers is described. The software, which runs on an IBM PC with math coprocessor, is based on a transfer-matrix formulation for calculating the characteristics of SAW propagation in multilayers that was originally written for a

E. L. Adler; J. K. Slaboszewicz; G. W. Farnell; C. K. Jen

1990-01-01

98

Extremely Low Phase Noise SAW Resonator Oscillator Design and Performance  

Microsoft Academic Search

SAW resonator designs with overnioded cavities. very wide apertures. dual apertures, etc.. as well as modified fabrication techniques. have been used to realize an overall reduction in an oscillator's phase noise spectrum. i.e.. white +M. flicker FM. and random walk FM. The incident RF power handling capability of these SAW resonator designs is in excess of +20 dBm. a key

G. K. Montress; T. E. Parker; M. J. Loboda

1987-01-01

99

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

100

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

101

Spirit at Work (SAW): fostering a healthy RN workplace.  

PubMed

A cross-sectional mixed-method survey explored and measured relationships between spirit at work (SAW) concepts, experience, education, practice context, job satisfaction, and organizational commitment using LISREL 8.80 and 2012 survey data from a random sample of 217 surgical and 158 home care registered nurses (RNs) in western Canada. Qualitative data underwent content analysis using a priori coding categories based on established theory. Final model indices fit the observed data. SAW concepts of engaging work and mystical experience accounted for moderate to large amounts of model variance for both home care and surgical nurses, while significant positive relationships between SAW concepts, job satisfaction, and organizational commitment were also reported. Researchers concluded that SAW contributes to improved job satisfaction and organizational commitment while being sensitive to RN experiences across clinical contexts. As an holistic measure of RN workplace perceptions, SAW contributes essential information directed at creating optimal environments for both health care providers and recipients. PMID:24510970

Wagner, Joan I J; Gregory, David M

2015-02-01

102

Fatty Acid and Phytosterol Content of Commercial Saw Palmetto Supplements  

PubMed Central

Saw palmetto supplements are one of the most commonly consumed supplements by men with prostate cancer and/or benign prostatic hyperplasia (BPH). Some studies have found significant improvements in BPH and lower urinary tract symptoms (LUTS) with saw palmetto supplementation, whereas others found no benefits. The variation in the efficacy in these trials may be a result of differences in the putative active components, fatty acids and phytosterols, of the saw palmetto supplements. To this end, we quantified the major fatty acids (laurate, myristate, palmitate, stearate, oleate, linoleate) and phytosterols (campesterol, stigmasterol, ?-sitosterol) in 20 commercially available saw palmetto supplements using GC-FID and GC-MS, respectively. Samples were classified into liquids, powders, dried berries, and tinctures. Liquid saw palmetto supplements contained significantly higher (p < 0.05) concentrations of total fatty acids (908.5 mg/g), individual fatty acids, total phytosterols (2.04 mg/g), and individual phytosterols, than the other supplement categories. Powders contained significantly higher (p < 0.05) concentrations of total fatty acids than tinctures, which contain negligible amounts of fatty acids (46.3 mg/g) and phytosterols (0.10 mg/g). Our findings suggest that liquid saw palmetto supplements may be the best choice for individuals who want to take a saw palmetto supplement with the highest concentrations of both fatty acids and phytosterols. PMID:24067389

Penugonda, Kavitha; Lindshield, Brian L.

2013-01-01

103

Analyzing the installation angle error of a SAW torque sensor  

NASA Astrophysics Data System (ADS)

When a torque is applied to a shaft, normal strain oriented at ±45° direction to the shaft axis is at its maximum, which requires two one-port SAW resonators to be bonded to the shaft at ±45° to the shaft axis. In order to make the SAW torque sensitivity high enough, the installation angle error of two SAW resonators must be confined within ±5° according to our design requirement. However, there are few studies devoted to the installation angle analysis of a SAW torque sensor presently and the angle error was usually obtained by a manual method. Hence, we propose an approximation method to analyze the angle error. First, according to the sensitive mechanism of the SAW device to torque, the SAW torque sensitivity is deduced based on the linear piezoelectric constitutive equation and the perturbation theory. Then, when a torque is applied to the tested shaft, the stress condition of two SAW resonators mounted with an angle deviating from ±45° to the shaft axis, is analyzed. The angle error is obtained by means of the torque sensitivities of two orthogonal SAW resonators. Finally, the torque measurement system is constructed and the loading and unloading experiments are performed twice. The torque sensitivities of two SAW resonators are obtained by applying average and least square method to the experimental results. Based on the derived angle error estimation function, the angle error is estimated about 3.447°, which is close to the actual angle error 2.915°. The difference between the estimated angle and the actual angle is discussed. The validity of the proposed angle error analysis method is testified to by the experimental results.

Fan, Yanping; Ji, Xiaojun; Cai, Ping

2014-09-01

104

Multi-electrodes in SAW with square wave ac power  

SciTech Connect

Examines the feasibility of using AC square wave power for multi-electrode submerged arc welding (SAW) by arranging 2 power sources for weld test using two-electrode submerged arc welding. Presents figures showing phase relationship between lead arc current and trail arc current for Scott connected multi-electrode SAW, and arc deflection vs. electrical degrees. Suggests that Scott connection is preferred because it balances the primary line draw. Concludes that the multielectrode submerged arc process with constant potential square wave power increases travel speed and deposition rates which can be added to the economies obtained from a narrow groove joint configuration and the SAW process.

Bunker, T.A.

1982-07-01

105

Sensitivity Improvement of Odor Sensing System Using Ball SAW Devices  

NASA Astrophysics Data System (ADS)

In this report, we improve a sensitivity of odor sensing system using ball SAW devices. Although, we reported the three-flavor identification using four ball SAW devices with different sensing films, the concentrations of the fruits flavors had to be high in the previous study. Thus several optimizations were performed here. First, we optimized the coating parameters of AC electrospray method. Second, we optimized sensing film thickness. Thirdly, we used Savitzky-Golay filter for smoothing response waveforms. After the improvement, we could detect butanol of 90ppb below human threshold. Finally we found that the response speed of ball SAW devices are superior to that of QCM with comparable sensitivity.

Sekine, Masaaki; Wyszynski, Bartosz; Nakamoto, Takamichi; Nakaso, Noritaka; Noguchi, Kazuhiro

106

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

107

Approximate Flavour Symmetries and See-Saw Mechanism  

E-print Network

We study the approximate flavour symmetries imposed on the lepton sector assuming see-saw mechanism as the neutrino mass structure. We apply the symmetry to various neutrino phenomenologies and obtain constraints on neutrino masses and mixings.

Kang Young Lee; Jae Kwan Kim

1995-07-07

108

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

109

A Saw-Based Spread Spectrum Wireless Lan System  

Microsoft Academic Search

In Japan, the spread spectrum wireless LAN is prospected to be approved by February 1993. Utilizing a new type SAW device, we succeeded in developing the spread spectrum wireless LAN system. Its data ratio is a 230-kbps.

Kazuyuki TAKEHARA; Toshiyuki TANAKA; K. Okada; T. Tada

1992-01-01

110

Surface acoustic wave (SAW) acoustophoresis: now and beyond.  

PubMed

On-chip manipulation of micro-objects has long been sought to facilitate fundamental biological studies and point-of-care diagnostic systems. In recent years, research on surface acoustic wave (SAW) based micro-object manipulation (i.e., SAW acoustophoresis) has gained significant momentum due to its many advantages, such as non-invasiveness, versatility, simple fabrication, easy operation, and convenient integration with other on-chip units. SAW acoustophoresis is especially useful for lab-on-a-chip applications where a compact and non-invasive biomanipulation technique is highly desired. In this Focus article, we discuss recent advancements in SAW acoustophoresis and provide some perspectives on the future development of this dynamic field. PMID:22781941

Lin, Sz-Chin Steven; Mao, Xiaole; Huang, Tony Jun

2012-08-21

111

DNA barcode authentication of saw palmetto herbal dietary supplements.  

PubMed

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

112

Frequency dependence of laser ultrasonic SAW phase velocities measurements.  

PubMed

Advances in the field of laser ultrasonics have opened up new possibilities in applications in many areas. This paper verifies the relationship between phase velocities of different materials, including hard solid and soft solid, and the frequency range of SAW signal. We propose a novel approach that utilizes a low coherence interferometer to detect the laser-induced surface acoustic waves (SAWs). A Nd:YAG focused laser line-source is applied to steel, iron, plastic plates and a 3.5% agar-agar phantom. The generated SAW signals are detected by a time domain low coherence interferometry system. SAW phase velocity dispersion curves were calculated, from which the elasticity of the specimens was evaluated. The relationship between frequency content and phase velocities was analyzed. We show that the experimental results agreed well with those of the theoretical expectations. PMID:22749523

Li, Chunhui; Song, Shaozhen; Guan, Guangying; Wang, Ruikang K; Huang, Zhihong

2013-01-01

113

5. View of north elevation, including saw dust collector and ...  

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

5. View of north elevation, including saw dust collector and brick addition, looking south east. - General Dynamics Corporation Shipyard, Joiner & Sheet Metal Shops, 97 East Howard Street, Quincy, Norfolk County, MA

114

19. William E. Barrett, Photographer, August 1975. LOWER BAND SAW ...  

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

19. William E. Barrett, Photographer, August 1975. LOWER BAND SAW PULLEYS OF RIGHT-HAND MILL. DRIVE PULLEY IN BELOW TENSION PULLEY. - Meadow River Lumber Company, Highway 60, Rainelle, Greenbrier County, WV

115

Anti-slipping system improves wire saw performance  

NASA Technical Reports Server (NTRS)

System prevents wire saw slippage by providing sufficient friction to turn idler spools even when turns of wire on spools do not provide sufficient friction. Low cost system is easily applied to existing equipment.

Gallo, E. A.

1971-01-01

116

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

117

High-frequency SAW filters based on diamond films.  

PubMed

We have developed a diamond SAW resonator capable of operating at frequencies over 3 GHz using a SiO(2)/ interdigital transducer (IDT)/AlN/diamond structure. This structure is expected to have a high Q value and a zero temperature coefficient of frequency (TCF) over 3 GHz, based on the high acoustic velocity of AlN. The SAW characteristics of various layered structures composed of SiO(2)/IDT/AlN/diamond substrates were studied both theoretically and experimentally. The SiO(2)/IDT/AlN/diamond substrate structure allows for a thicker IDT metal layer compared with other SAW device designs, such as the SiO(2)/IDT/ZnO/diamond structure. The thicker metal IDT in the present design leads to a lower series resistance and, in turn, a low insertion loss for SAW devices over 3 GHz. Using a second-mode (Sezawa-mode) SAW, the phase velocity and electromechanical coupling coefficient of the SiO(2)/IDT/AlN/diamond substrate reached the larger values of 11 150 m/s and 0.5%, respectively, and a zero TCF characteristic at 25°C was achieved. One-port SAW resonators fabricated from diamond substrates showed a high Q of 660 at 5.4 GHz. The frequency drift over a temperature range of -25°C to 80°C was about 90 ppm, even less than that for ST-quartz SAW substrates. A two-port resonator showed a low insertion loss of 8 dB at 5.4 GHz. Finally, we designed a 5-GHz band-stop SAW filter. A 30-MHz-wide stopband at a -6-dB rejection level was achieved while keeping the passband insertion loss to 0.76 dB. These characteristics of these filters show good potential for SHF-band filters. PMID:23221225

Fujii, Satoshi; Jian, Chunyun

2012-12-01

118

See-saw nystagmus and brainstem infarction: MRI findings  

NASA Technical Reports Server (NTRS)

A patient with see-saw nystagmus had a lesion localized by Magnetic Resonance Imaging (MRI) to the paramedian ventral midbrain with involvement of the right interstitial nucleus of Cajal. This the first MRI study of see-saw nystagmus associated with a presumed brainstem vascular event. Our findings support animal and human studies suggesting that dysfunction of the interstitial nucleus of Cajal or its connections is central in this disorder.

Kanter, D. S.; Ruff, R. L.; Leigh, R. J.; Modic, M.

1987-01-01

119

An alternative for righthanded neutrinos: lefthanded see--saw  

E-print Network

A new lefthanded see-saw mechanism is constructed, implying both the smallness of active-neutrino masses and decoupling of heavy passive neutrinos, similarly to the situation in the case of conventional see-saw. But now, in place of the conventional righthanded neutrinos, the lefthanded sterile neutrinos play the role of heavy passive neutrinos, the righthanded neutrinos and righthanded sterile neutrinos being absent. In this case, the neutrino mass term is necessarily of pure Majorana type.

Wojciech Krolikowski

1999-09-10

120

3+2 neutrinos in a see-saw variation  

E-print Network

If the sterile neutrino mass matrix in an otherwise conventional see-saw model has a rank less than the number of flavors, it is possible to produce pseudo-Dirac neutrinos. For the rank 1 case, 3+2 scenarios devolve naturally, as we show by example. Additionally, we find that the lower rank see-saw suppresses some mass differences, so that small mass differences do not require that the individual masses of each neutrino must also be small.

G. J. Stephenson, Jr.; T. Goldman; B. H. J. McKellar; M. Garbutt

2003-07-18

121

A new generalized modeling of SAW transducers and gratings  

Microsoft Academic Search

A general coupling-of-modes analysis of SAW transducers and gratings is presented. The analysis is applicable to the complete continuum of SAW devices, from transducers with or without internal reflections to grating reflectors comprised of grooves or metallic stripes. The analysis incorporates several important phenomena not previously included in analyses of this type. Both the effects of finite-electrode resistivity and spatially

P. V. Wright

1989-01-01

122

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

123

Leptogenesis and LHC Physics with Type III See-Saw  

E-print Network

The See-Saw mechanism provides a nice way to explain why neutrino masses are so much lighter than their charged lepton partners. It also provides a nice way to explain baryon asymmetry in our universe via the leptogenesis mechanism. In this talk we review leptogenesis and LHC physics in a See-Saw model proposed in 1989, now termed the Type III See-Saw model. In this model, $SU(2)_L$ triplet leptons are introduced with the neutral particles of the triplets playing the role of See-Saw. The triplet leptons have charged partners with standard model gauge interactions resulting in many new features. The gauge interactions of these particles make it easier for leptognesis with low masses, as low as a TeV is possible. The gauge interactions also make the production and detection of triplet leptons at LHC possible. The See-Saw mechanism and leptogenesis due to Type III See-Saw may be tested at LHC.

Shao-Long Chen; Xiao-Gang He

2009-01-09

124

The Type-II Singular See-Saw Mechanism  

E-print Network

The singular see-saw mechanism is a variation of the see-saw mechanism whereby the right-chiral neutrino Majorana mass matrix is singular. Previous works employing the singular see-saw mechanism have assumed a vanishing left-chiral Majorana mass matrix. We study the neutrino spectrum obtained under a singular see-saw mechanism when the left-chiral neutrinos possess a non-zero Majorana mass matrix. We refer to this as the type-II singular see-saw mechanism. The resulting neutrino spectrum is found to be sensitive to the hierarchy of the Dirac and Majorana mass scales used and we explore the phenomenological consequences of the candidate hierarchies. The compatibility of the resulting spectra with the body of neutrino oscillation data is discussed. It is found that neutrino mass matrices with this structure result in 3+1 or 2+2 neutrino spectra, making it unlikely that this mass matrix structure is realized in nature. If the left-chiral Majorana mass matrix is also singular we show that a type-II singular see-saw mechanism can realize a spectrum of one active-sterile pseudo-Dirac neutrino in conjunction with two active Majorana neutrinos effectively decoupled from the sterile sector. This realizes a scheme discussed in the literature in relation to astrophysical neutrino fluxes.

Kristian. L. McDonald; B. H. J. McKellar

2004-01-12

125

Theoretical study on SAW characteristics of layered structures including a diamond layer  

Microsoft Academic Search

Diamond has the highest surface acoustic wave (SAW) velocity among all materials and thus can provide much advantage for fabrication of high frequency SAW devices when it is combined with a piezoelectric thin film. Basic SAW properties of layered structures consisting of a piezoelectric material layer, a diamond layer and a substrate were examined by theoretical calculation. Rayleigh mode SAW's

Hideaki Nakahata; Akihiro Hachigo; Kenjiro Higaki; Satoshi Fujii; Shin-ichi Shikata; Naoji Fujimori

1995-01-01

126

Notes on SAW Tag Interrogation Techniques  

NASA Technical Reports Server (NTRS)

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 with geometric power-decay constant alpha >/= 2. (2) The interfering tag IDs are unknown but well approximated as independent, identically distributed random samples from a probability distribution of tag ID waveforms with known second-order properties, and the tag of interest is drawn independently from the same distribution. (3) The ranges of the interfering tags are unknown but well approximated as independent, identically distributed realizations of a random variable rho with a known probability distribution f(sub rho) , and the tag ranges are independent of the tag ID waveforms. In particular, we model the tag waveforms as random impulse responses from a wide-sense-stationary, uncorrelated-scattering (WSSUS) fading channel with known bandwidth and scattering function. A brief discussion of the properties of such channels and the notation used to describe them in this document is given in the Appendix. Under these assumptions, we derive the expression for the output signal-to-noise ratio (SNR) for an arbitrary combination of transmitted interrogation signal and linear receiver filter. Based on this expression, we derive the optimal interrogator configuration (i.e., transmitted signal/receiver filter combination) in the two extreme noise/interference regimes, i.e., noise-limited and interference-limited, under the additional assumption that the coherence bandwidth of the tags is much smaller than the total tag bandwidth. Finally, we evaluate the performance of both optimal interrogators over a broad range of operating scenarios using both numerical simulation based on the assumed model and Monte Carlo simulation based on a small sample of measured tag waveforms. The performance evaluation results not only provide guidelines for proper interrogator design, but also provide some insight on the validity of the assumed signal model. It should be noted that the assumption that the impulse response of the tag of interest is known precisely implies that the temperature and range of the tag are also known precisely, which is generally not the case in practice. However, analyzing interrogator performance under this simplifying assumption is much more straightforward and still provides a great deal of insight into the nature of the problem.

Barton, Richard J.

2010-01-01

127

Diamond Wire Saw for Precision Machining of Laser Target Components  

SciTech Connect

The fabrication of precision laser targets requires a wide variety of specialized mesoscale manufacturing techniques. The diamond wire saw developed in this study provides the capability to precisely section meso-scale workpieces mounted on the assembly stations used by the Target Fabrication Group. This new capability greatly simplifies the fabrication of many types of targets and reduces the time and cost required to build the targets. A variety of materials are used to fabricate targets, including metals, plastics with custom designed chemical formulas, and aerogels of various densities. The materials are usually provided in the form of small pieces or cast rods that must be machined to the required shape. Many of these materials, such as metals and some plastics, can be trimmed using a parting tool on a diamond turning machine. However, other materials, such as aerogels and brittle materials, cannot be adequately cut with a parting tool. In addition, the geometry of the parts often requires that the workpieces be held in a special assembly station, which excludes the use of a parting tool. In the past, these materials were sectioned using a small, handheld coping saw that used a diamond-impregnated wire as a blade. This miniature coping saw was effective, but it required several hours to cut through certain materials. Furthermore, the saw was guided by hand and often caused significant damage to fragile aerogels. To solve these problems, the diamond wire saw shown in Figure 1 was developed. The diamond wire saw is designed to machine through materials that are mounted in the Target Fabrication Group's benchtop assembly stations. These assembly stations are the primary means of aligning and assembling target components, and there is often a need to machine materials while they are mounted in the assembly stations. Unfortunately, commercially available saws are designed for very different applications and are far too large to be used with the assembly stations. Therefore, a custom diamond wire saw was designed and constructed. The diamond wire saw cuts through workpieces using a continuous loop of diamond-impregnated wire of length 840 mm. The wire loop runs around several idler pulleys and is driven by a simple geared DC motor that rotates at 17 rpm. The linear speed of the wire is 107 inches/minute. The saw is oriented at an angle of 20{sup o} from horizontal, so the operator can view the wire through the cutout at the front end of the saw. When looking through a microscope or camera with a horizontal line of sight, the operator can clearly see the wire as it cuts through the workpiece, as shown in the right side of Figure 1. The saw is mounted on a two-axis stage that allows the operator to align the wire with the workpiece. To cut through the workpiece, the operator drives the wire through the workpiece by turning the feed micrometer. An image of the interior of the diamond wire saw appears in Figure 2. This picture was taken after removing the protective cover plate from the saw.

Bono, M J; Bennett, D W

2005-08-08

128

A possible case of saw palmetto-induced pancreatitis.  

PubMed

A 65-year-old male with a history of diabetes, hypertension, hyperlipidemia, gout, Barrett esophagitis, and chronic gastritis developed acute pancreatitis after taking one week of the herbal medicine, saw palmetto, for symptoms related to benign prostatic hyperplasia (BPH). Ultrasound and computed tomography ruled out cholelithiasis and obstruction, triglycerides were normal, and he had no recent infection or trauma. He had a history of occasional alcohol consumption, though there was no recent increased intake. The most likely cause of pancreatitis in this case was saw palmetto. Saw palmetto (Serenoa repens) is an herbal medication used primarily in the treatment of symptoms related to BPH. It has a high content of fatty acids and phytosterols which are thought to exert their effects by inhibiting the enzyme 5-alpha-reductase, thereby preventing the conversion of testosterone into dihydrotestosterone (DHT). It has been postulated that saw palmetto directly stimulates estrogenic receptors and inhibits progesterone receptors in the prostate tissue. A previous report implicated the estrogen/antiandrogen properties of saw palmetto as inducing hepatotoxicity in a patient. Additionally, it has also been postulated that stimulation of the estrogenic receptors may lead to increased triglyceride levels or induction of a hypercoagulable state that leads to pancreatic necrosis. Finally, inhibition of cyclooxygenase, a property of saw palmetto, may be linked to acute pancreatitis. Acute pancreatitis, a serious and sometimes fatal disorder may occur secondary to medications. Although the mechanism is not fully known, this is the second case of acute pancreatitis that has been documented secondary to the herbal medication saw palmetto. It is important for clinicians to obtain detailed medication histories, including over-the-counter and herbal medications, in order to prevent further complications from occurring. PMID:20531057

Wargo, Kurt A; Allman, Elena; Ibrahim, Farrah

2010-07-01

129

A4 See-Saw Models and Form Dominance  

E-print Network

We introduce the idea of Form Dominance in the (type I) see-saw mechanism, according to which a particular right-handed neutrino mass eigenstate is associated with a particular physical neutrino mass eigenstate, leading to a form diagonalizable effective neutrino mass matrix. Form Dominance, which allows an arbitrary neutrino mass spectrum, may be regarded as a generalization of Constrained Sequential Dominance which only allows strongly hierarchical neutrino masses. We consider alternative implementations of the see-saw mechanism in minimal A4 see-saw models and show that such models satisfy Form Dominance, leading to neutrino mass sum rules which predict closely spaced neutrino masses with a normal or inverted neutrino mass ordering. To avoid the partial cancellations inherent in such models we propose Natural Form Dominance, in which a different flavon is associated with each physical neutrino mass eigenstate.

Mu-Chun Chen; Stephen F. King

2009-03-01

130

Effect of lubricant environment on saw damage in silicon wafers  

NASA Technical Reports Server (NTRS)

The chemomechanical effect of lubricant environments on the inner diameter (ID) sawing induced surface damage in Si wafers was tested for four different lubricants: water, dielectric oil, and two commercial cutting solutions. The effects of applying different potential on Si crystals during the sawing were also tested. It is indicated that the number and depth of surface damage are sensitive to the chemical nature of the saw lubricant. It is determined that the lubricants that are good catalysts for breaking Si bonds can dampen the out of plane blade vibration more effectively and produce less surface damage. Correlations between the applied potential and the depth of damage in the dielectric oil and one of the commercial cutting solutions and possible mechanisms involved are discussed.

Kuan, T. S.; Shih, K. K.; Vanvechten, J. A.; Westdorp, W. A.

1982-01-01

131

A high sensitivity nanomaterial based SAW humidity sensor  

NASA Astrophysics Data System (ADS)

In this paper, a highly sensitive humidity sensor is reported. The humidity sensor is configured by a 128°YX-LiNbO3 based surface acoustic wave (SAW) resonator whose operating frequency is at 145 MHz. A dual delay line configuration is realized to eliminate external temperature fluctuations. Moreover, for nanostructured materials possessing high surface-to-volume ratio, large penetration depth and fast charge diffusion rate, camphor sulfonic acid doped polyaniline (PANI) nanofibres are synthesized by the interfacial polymerization method and further deposited on the SAW resonator as selective coating to enhance sensitivity. The humidity sensor is used to measure various relative humidities in the range 5-90% at room temperature. Results show that the PANI nanofibre based SAW humidity sensor exhibits excellent sensitivity and short-term repeatability.

Wu, Tsung-Tsong; Chen, Yung-Yu; Chou, Tai-Hsu

2008-04-01

132

High frequency SAW devices based on third harmonic generation.  

PubMed

We demonstrate the third harmonic generation in a ZnO/Si layered structure to obtain high frequency SAW devices. This configuration eliminates the need of high lithography resolution and allows easy integration of such devices and electronics on the same wafer. A theoretical study was carried out for the determination of the phase velocity and the electromechanical coupling coefficient (K(2)) dispersion curves of the surface acoustic waves. These results are also in agreement with those measured on a SAW filter designed for the third harmonic generation and the operating frequency is up to 2468 MHz. PMID:17055019

Le Brizoual, L; Elmazria, O; Sarry, F; El Hakiki, M; Talbi, A; Alnot, P

2006-12-01

133

A surface acoustic wave /SAW/ charge transfer imager  

NASA Technical Reports Server (NTRS)

An 80 MHz, 2-microsecond surface acoustic wave charge transfer device (SAW-CTD) has been fabricated in which surface acoustic waves are used to create traveling longitudinal electric fields in the silicon substrate and to replace the multiphase clocks of charge coupled devices. The traveling electric fields create potential wells which will carry along charges that may be stored in the wells; the charges may be injected into the wells by light. An optical application is proposed where the SAW-CTD structure is used in place of a conventional interline transfer design.

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

1981-01-01

134

Phenomenology of TeV Scale See-Saw Mechanism  

E-print Network

We review the low energy constraints on type I see-saw extensions of the Standard Model in which the scale of new physics, associated to lepton number violation, can be probed at current collider searches. In such scenarios, the flavour structure of the charged current and neutral current weak interactions of the Standard Model leptons with the heavy right-handed neutrinos, which provide the contribution of new physics, is essentially determined by the neutrino oscillation parameters. Correlations among different low energy observables in the lepton sector emerge, which may provide a striking indirect evidence of low energy (TeV scale) see-saw mechanism.

Emiliano Molinaro

2011-11-13

135

An unorthodox alternative for righthanded neutrinos: lefthanded see-saw  

E-print Network

A new lefthanded see-saw mechanism is constructed, implying both the smallness of active-neutrino masses and decoupling of heavy passive neutrinos, similarly to the situation in the case of conventional see-saw. But now, in place of the conventional righthanded neutrinos, the lefthanded sterile neutrinos play the role of heavy passive neutrinos, the righthanded neutrinos and righthanded sterile neutrinos being absent. Here, the lefthanded sterile neutrinos are different from charge conjugates of conventional righthanded neutrinos because their lepton numbers differ. In this case, the neutrino mass term is necessarily of pure Majorana type.

W. Krolikowski

1999-11-02

136

Running Neutrino Mass Parameters in See-Saw Scenarios  

E-print Network

We systematically analyze quantum corrections in see-saw scenarios, including effects from above the see-saw scales. We derive approximate renormalization group equations for neutrino masses, lepton mixings and CP phases, yielding an analytic understanding and a simple estimate of the size of the effects. Even for hierarchical masses, they often exceed the precision of future experiments. Furthermore, we provide a software package allowing for a convenient numerical renormalization group analysis, with heavy singlets being integrated out successively at their mass thresholds. We also discuss applications to model building and related topics.

Stefan Antusch; Joern Kersten; Manfred Lindner; Michael Ratz; Michael Andreas Schmidt

2005-01-31

137

Indirect Signatures of Type I See-Saw Scenarios  

E-print Network

We consider the low energy constraints that can be applied to type I see-saw extensions of the Standard Model in which the right-handed neutrinos are taken at the electroweak scale. In the reported scenarios, the flavour structure of the charged current and neutral current weak interactions of the Standard Model leptons with the heavy right-handed neutrinos is essentially determined by the neutrino oscillation parameters. In this case, correlations among different measurable phenomena in the lepton sector may provide compelling indirect evidence of low energy see-saw mechanism of neutrino mass generation.

Emiliano Molinaro

2011-12-03

138

C-SAW: Consortium for Scientific Assistance to Watersheds  

NSDL National Science Digital Library

"The goal for C-SAW is to transfer knowledge and skills to watershed groups or local sponsors thereby helping to build their capacity to plan and conduct watershed assessments, and conduct post-implementation monitoring." Users can learn about the technical assistance provided by C-SAW, including watershed specific assistance, mentoring, and water quality education available to eligible groups in the state of Pennsylvania. Visitors can find the necessary materials to apply for this opportunity. The website also offers links to the program's many partners and other watershed resources and assistance.

139

Research on cutting technology of underwater diamond wire saw  

Microsoft Academic Search

During the maintenance and repair of Seabed oil pipelines which need cut off when they are breakage, and it is very difficult to completion the task with common underwater cutting ways. The experiment of cut seabed oil pipelines has been successfully done with the diamond wire saw which we design and produce independent and come to certain working efficiency. Seabed

Liwen Cao

2008-01-01

140

Micromechanical precision pressure sensor incorporating SAW delay lines  

Microsoft Academic Search

Summary We have developed a wireless surface acoustic wave (SAW) pressure sensor operating in the pressure range of 0 Pa to 250 kPa. In order to minimize the temperature sensitivity the pressure sensor is made of on an all-quartz package (AQP), which has been designed with the Finite Element Method. The package of the pressure sensor consists of a diaphragm

M. Jungwirth; H. Scherr; R. Weigel

2002-01-01

141

Quartz pressure sensor based on SAW reflective delay line  

Microsoft Academic Search

We have developed a wireless SAW (Surface Acoustic Wave) pressure sensor operating in the pressure range from 0 Pa to 250 kPa. In order to minimize the temperature sensitivity the pressure sensor is based on an all quartz package, which has been designed with the Finite Element Method. The package of the pressure sensor consists of a diaphragm and a

H. Scherr; Gerd Scholl; Franz Seifert; R. Weigel

1996-01-01

142

A SAW convolver-based spread spectrum communications subsystem  

Microsoft Academic Search

A spread spectrum communications subsystem that is based on the separated medium acoustoelectric convolver is described. The subsystem performs waveform generation with the aid of SAW MSK filters and DPSK demodulation with acoustoelectric convolvers. The convolver provides a BT product of 2200 with a 3 dB bandwidth of 100 MHz. The relevant properties of the convolvers are outlined and the

J. H. Goll

1980-01-01

143

A Prediction from the Type III See-saw Mechanism  

E-print Network

A simple ansatz that is well-motivated by group-theoretical considerations is proposed in the context of the type III neutrino see-saw mechanism. It results in predictions for m_s/m_b and m_b/m_tau that relate these quantities to the masses and mixings of neutrinos.

S. M. Barr; Ilja Dorsner

2005-07-06

144

See-saw mechanism and four light neutrino state  

E-print Network

A formal proof is given that in a see-saw type neutrino mass matrix with only two neutrino mass scales ($m_D \\ll m_R$) and the maximal rank of $m_{R(D)}$, we can not get a fourth light sterile neutrino.

M. Czakon; J. Gluza; M. Zralek

2001-07-30

145

Light Higgs from Scalar See-Saw in Technicolor  

E-print Network

We consider a TeV scale see-saw mechanism leading to light scalar resonances in models with otherwise intrinsically heavy scalars. The mechanism can provide a 125 GeV technicolor Higgs in e.g. two-scale TC models

Roshan Foadi; Mads T. Frandsen

2012-11-30

146

A global SAW ID tag with large data capacity  

Microsoft Academic Search

The Global SAW Tag uses a recently-invented digital modulation based on simultaneous time position and phase shifting. A unique feature of this tag is that it satisfies global RFID requirements using the international 2.44 GHz ISM band. Precision amplitude and phase weighting of reflectors and accurate control of parasitic effects is critical to implementing this device. This tag has significantly

Clinton S. Hartmann

2002-01-01

147

Suppressing buzz-saw noise in jet engines  

NASA Technical Reports Server (NTRS)

Buzz-saw noise, most annoying noise component generated by turbofan engines, can be suppresses by installing porous surface on duct wall directly above engine fan-blade tip. Porous surface and its housing would reduce shock-wave reflection from wall and thus suppress noise.

Maestrello, L.

1980-01-01

148

See-saw Mechanism and Possible Generation Structure  

E-print Network

On the basis of see-saw mechanism, possible generation structure is investigated. Assuming that right-handed neutrinos are realistic particles below GUTs mass, it is shown that there is a choice of new scheme of generation,where the combination of leptons and quarks is different from the ordinary one. Our scheme predict a new proton decay mode.

Kazuo Koike

1999-09-02

149

Rigorous analysis of finite SAW devices with arbitrary electrode geometries  

Microsoft Academic Search

This paper proposes a rigorous numerical model allowing the analysis of finite SAW filters with only the 2D approximation: all the acoustical and electrical interactions are taken into account as well as mass loading effects. Areas outside the interdigital transducers can be either free surface or fully metallized: in the first case, a charge distribution formulation is used while, in

Pascal Ventura; Jean Michel Hode; Bruno Lopes

1995-01-01

150

Overview of design challenges for single phase unidirectional SAW filters  

Microsoft Academic Search

A comprehensive discussion of the design synthesis challenges for single-phase unidirectional transducers (SPUDTs) is presented. The complexity of SPUDT filter design results from the fact that a SPUDT deliberately includes reflections internal to the transducer to cancel the effects of regeneration reflection. This destroys the validity of the impulse-response model which is the basis for all conventional SAW (surface acoustic

C. S. Hartmann; B. P. Abbott

1989-01-01

151

A general Green function analysis for SAW devices  

Microsoft Academic Search

Methods for calculating Green functions that can fully characterize the properties of a SAW substrate with respect to both mechanical and electrical excitation are described. The Green function is initially represented as a 4×4 matrix of functions in k (wavenumber) space; it describes the three surface displacement components and the electrical potential in terms of the three surface stress components

R. C. Peach

1995-01-01

152

No. 2 outside diameter submerged arc welder of the saw ...  

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

No. 2 outside diameter submerged arc welder of the saw line in bay 8 of the main pipe mill building looking south. - U.S. Steel National Tube Works, Main Pipe Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA

153

PC software for SAW propagation in anisotropic multilayers.  

PubMed

A software package that provides an interactive and graphical environment for surface acoustic wave (SAW) and plate-mode propagation studies in arbitrarily oriented anisotropic and piezoelectric multilayers is described. The software, which runs on an IBM PC with math coprocessor, is based on a transfer-matrix formulation for calculating the characteristics of SAW propagation in multilayers that was originally written for a mainframe computer. The menu-driven software will calculate wave velocities and field variable variations with depth for any desired propagation direction: the graphics capability provides a simultaneous display of slowness or velocity and of SAW Deltav/v coupling constant curves, and their corresponding field profiles in either polar or Cartesian coordinates, for propagation in a selected plane or as a function of one of the Euler angles. The program generates a numerical data file containing the calculated velocities and field profile data. Examples illustrating the usefulness of the software in the study of various SAW and plate structures are presented. PMID:18285034

Adler, E L; Slaboszewicz, J K; Farnell, G W; Jen, C K

1990-01-01

154

A Novel Wireless and Temperature-Compensated SAW Vibration Sensor  

PubMed Central

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

155

Towards an ideal photon correlator with a SAW-device  

NASA Astrophysics Data System (ADS)

The advantages and disadvantages of the clipped correlator for photoelectric correlation measurements are analysed. A scheme is suggested by which the problem of inversion (an inherent disadvantage of clipping) is obviated. With the availability of surface acustic wave (SAW) delay lines, we would like to point out that one can make an almost ideal photon correlator.

Kulkarni, S. R.; Chopra, S.

1980-05-01

156

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

157

Passive wireless strain and temperature sensors based on SAW devices  

Microsoft Academic Search

This work gives an overview of existing approaches to wireless strain and temperature measurements that employ passive sensors based on two types of SAW devices; reflective delay lines and one-port resonators. The performance of these two types of sensors is compared from the point of view of the achieved sensitivity, resolution, read range, interrogation time and power. A quantitative comparison

Victor Kalinin

2004-01-01

158

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

159

ZnO nanomaterials based SAW ethanol gas sensor  

Microsoft Academic Search

In this paper, ZnO nanomaterials with high effective specific surface area have been prepared and subsequently deposited on the SAW transducer as sensitive layer, finally the responses of the sensor to different ethanol gas concentrations were investigated at room temperature.

Y. Wu; X. Li; J. H. Liu; L. M. Yu; X. D. Hu

2010-01-01

160

Brickconstructed saw toothprofile fire wall between the Cannery and original ...  

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

Brick-constructed saw tooth-profile fire wall between the Cannery and original Warehouse (demolished), note the steel trusses remaining on the wall from the Warehouse roof, view facing north northeast - Kahului Cannery, Plant No. 28, Cannery Building and Dryer House/Feed Storage Building, 120 Kane Street, Kahului, Maui County, HI

161

Overview of Cannery Building, note the saw tooth monitors with ...  

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

Overview of Cannery Building, note the saw tooth monitors with glazing and with corrugated fiberglass and screens, view facing north - Kahului Cannery, Plant No. 28, Cannery Building and Dryer House/Feed Storage Building, 120 Kane Street, Kahului, Maui County, HI

162

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

163

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

Federal Register 2010, 2011, 2012, 2013, 2014

...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

164

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

Federal Register 2010, 2011, 2012, 2013, 2014

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

2011-12-02

165

Saw-Cutting Guidelines for Concrete Pavements: Examining the Requirements for Time and Depth of Saw-Cutting  

Microsoft Academic Search

Joints are placed in Portland cement concrete pavements (PCCP) to control random cracking. These joints provide a weakened plane that enables a crack to form in a controlled manner, relieving residual stresses that develop when thermal, hygral, or hydration movements are resisted by sub grade and adjoining pavement. While the concept of creating a weakened plane through saw-cutting is straightforward,

Kambiz Raoufi; Tony Their; W. Jason Weiss; Jan Olek; Tommy E. Nantung

2009-01-01

166

Chapter 6 -Chain Saw Safety Modern lightweight chains saws have become common on farms, as well as in urban  

E-print Network

off a fire. Also, don't let dry combustible material contact a hot muffler. Spilled fuel adds to the danger. Refuel on bare ground with the engine stopped and wipe spilled fuel off the saw at once. Move is removed from it, the sapling could snap up with tremendous force and seriously injure anyone nearby. #12

167

K-cut SAW resonator with both static and dynamic zero temperature coefficients  

Microsoft Academic Search

Using a K-cut quartz SAW resonator, which is significantly less sensitive to thermal shock than an ST-cut quartz SAW resonator, we studied their design and made prototype SAW resonators with cylindrical capsules. They have zero temperature coefficient of frequency at room temperature and have good properties for practical use

Michiaki Takagi; Eishi Momosaki; M. Yamakita; N. Oura

1996-01-01

168

STUDY OF A WIRE BRUSH GRID BAR REPLACEMENT FOR SAW-TYPE LINT CLEANERS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Saw type lint cleaners are commonly used to improve the overall quality of ginned lint through the removal of non-lint material and short fibers. A standard saw type lint cleaner is made up of several components: the feed works, saws, and grid bars. Slover Manufacturing (Lamesa, TX) has designed an...

169

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

170

NONLINEAR SAW PROPAGATION IN THIN-FILM SYSTEMS WITH RESIDUAL STRESS* R. E. Kumon  

E-print Network

NONLINEAR SAW PROPAGATION IN THIN-FILM SYSTEMS WITH RESIDUAL STRESS* R. E. Kumon National Institute-- The propagation of small- and finite- amplitude surface acoustic waves (SAWs) in stressed thin-film systems in a product. Measurements of small-amplitude SAWs can characterize stresses through the acoustoelastic effect

171

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

Federal Register 2010, 2011, 2012, 2013, 2014

...Collection; Comment Request; CPSC Table Saw User Survey AGENCY: Consumer Product Safety...notice solicits comments on a survey of table saw users to determine the effectiveness of...information set forth in this document. A. Table Saw User Survey The CPSC is considering...

2013-05-28

172

Electronic nose based on SAWS array and its odor identification capability  

Microsoft Academic Search

The ability of odor identification by an electronic nose based on eight surface acoustic wave sensors (SAWS) was demonstrated in the present paper. The SAWS-based electronic nose was established first and its frequency stability was checked. Then, by applying appropriate polymers coating on SAW devices (SAWD), the prototype instrument was employed to collect data from its exposure to four kinds

Yan-Ming Yang; Peng-Yuan Yang; Xiao-Ru Wang

2000-01-01

173

Hydrogen-Bond Basic Siloxane Phosphonate Polymers for Surface Acoustic Wave (Saw) Sensors  

Technology Transfer Automated Retrieval System (TEKTRAN)

A surface acoustic wave (SAW) sensor coated with a novel hydrogen-bond basic siloxane phosphonate SAW polymer gave excellent initial response and long-term performance when tested against phenol vapor and compared with polyethyleneimine (PEI), a conventional hydrogent-bond basic SAW polymer....

174

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

Microsoft Academic Search

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

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

1995-01-01

175

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

176

A See-saw model of sterile neutrino  

E-print Network

If the smallness of the mass of the sterile neutrino is to be explained by the see-saw mechanism, the off-diagonal entries of the mass matrix needs to be protected by some symmetry not far above the electroweak scale. We implement see-saw mechanism in a gauge model based on $SU(2)^q_L \\times SU(2)^l_L \\times U(1)^q_Y \\times U(1)^l_Y$ un-unified gauge group which breaks to $SU(2)_L \\times U(1)_Y$ at the TeV region via a two-step symmetry breaking chain. The right handed diagonal block is tied to the highest scale up to which the un-unification symmetry holds. The sterile neutrino emerges from a quark-lepton mixed representation of the un-unified group.

Biswajoy Brahmachari

1998-12-01

177

See-saw Mechanisms for Dirac and Majorana Neutrino Masses  

E-print Network

We investigate the see-saw mechanism for generally non-fine-tuned $n \\times n$ mass matrices involving both Dirac and Majorana neutrinos. We specifically show that the number of naturally light neutrinos cannot exceed half of the dimension of the considered mass matrix. Furthermore, we determine a criterion for mass matrix textures leading to light Dirac neutrinos with the see-saw mechanism. Especially, we study $4 \\times 4$ and $6 \\times 6$ mass matrix textures and give some examples in order to highlight these types of textures. Next, we present a model scheme based on non-Abelian and discrete symmetries fulfilling the above mentioned criterion for light Dirac neutrinos. Finally, we investigate the connection between symmetries and the invariants of a mass matrix on a formal level.

Manfred Lindner; Tommy Ohlsson; Gerhart Seidl

2001-09-27

178

SAW with multiple electrodes achieves high production rates  

SciTech Connect

Increased demands for higher productivity in the production of welded structures dictate the use of new higher-performance welding procedures. Submerged arc welding (SAW) is already one of the highest performing arc welding processes, but with certain improved variants, its performance can be increased. These variants are multiple-head welding, double electrode welding and submerged arc welding with metal powder addition. These three variations of submerged arc welding have been put into practice and are extensively treated in the welding literature. The application of welding with more than three wires in a joint contact tube is rare, however, and rarely mentioned. The purpose of this article is to show the basic characteristics and eventual applications of SAW using multiple electrodes.

Tusek, J. [Inst. Za Varilstvo, Ljubljana (Slovenia)

1996-08-01

179

A Blocker Filtering Technique for SAW-Less Wireless Receivers  

Microsoft Academic Search

An active filtering technique to remove the out-of-band blockers in wireless receivers is presented. The circuit employs a feed-forward filtering path to produce an arbitrarily narrow frequency response in the low-noise amplifier (LNA), eliminating the need for an external surface acoustic wave (SAW) filter at the receiver front-end. The required notch filtering in the feed-forward path is realized through a

Hooman Darabi

2007-01-01

180

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

181

Metal splinter ejected by circular saw into the left ventricle.  

PubMed

We report a case of a metal splinter ejected by a circular saw tooth from a wooden board into the left ventricle of the heart. A 35-year old man was admitted second day after accident attributed to work complaining about general weakness. Only a small non-bleeding wound was found near his sternum. CT scan showed a metal wire entrapped inside his heart. Successful removal was done during surgery. PMID:25129813

Santavy, Petr; Troubil, Martin; Lonsky, Vladimir

2014-11-01

182

Leptogenesis in Unified Theories with Type II See-Saw  

E-print Network

In some classes of flavour models based on unified theories with a type I see-saw mechanism, the prediction for the mass of the lightest right-handed neutrino is in conflict with the lower bound from the requirement of successful thermal leptogenesis. We investigate how lifting the absolute neutrino mass scale by adding a type II see-saw contribution proportional to the unit matrix can solve this problem. Generically, lifting the neutrino mass scale increases the prediction for the mass of the lightest right-handed neutrino while the decay asymmetry is enhanced and washout effects are reduced, relaxing the lower bound on the mass of the lightest right-handed neutrino from thermal leptogenesis. For instance in classes of unified theories where the lightest right-handed neutrino dominates the type I see-saw contribution, we find that thermal leptogenesis becomes possible if the neutrino mass scale is larger than about 0.15 eV, making this scenario testable by neutrinoless double beta decay experiments in the near future.

Stefan Antusch; Steve F. King

2005-07-29

183

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

184

A chirp spread spectrum DPSK modulator and demodulator for a time shift multiple access communication system by using SAW devices  

Microsoft Academic Search

We have developed a modulator and a demodulator for DPSK modulated chirp signals using a SAW dispersive delay line and a SAW matched filter. The SAW chirp modulator spreads the 100 MHz spectrum between every 1 bit data interval of 1.5 ?sec and provides DPSK modulation, depending upon data. The SAW demodulator demodulates data using exclusive output pulses from two

Yoshihiko Takeuchi; K. Yamanouchi

1998-01-01

185

The see-saw mechanism: neutrino mixing, leptogenesis and lepton flavor violation  

E-print Network

The see-saw mechanism to generate small neutrino masses is reviewed. After summarizing our current knowledge about the low energy neutrino mass matrix we consider reconstructing the see-saw mechanism. Low energy neutrino physics is not sufficient to reconstruct see-saw, a feature which we refer to as ``see-saw degeneracy''. Indirect tests of see-saw are leptogenesis and lepton flavor violation in supersymmetric scenarios, which together with neutrino mass and mixing define the framework of see-saw phenomenology. Several examples are given, both phenomenological and GUT-related. Variants of the see-saw mechanism like the type II or triplet see-saw are also discussed. In particular, we compare many general aspects regarding the dependence of LFV on low energy neutrino parameters in the extreme cases of a dominating conventional see-saw term or a dominating triplet term. For instance, the absence of mu -> e gamma or tau -> e gamma in the pure triplet case means that CP is conserved in neutrino oscillations. Scanning models, we also find that among the decays mu -> e gamma, tau -> e gamma and tau -> mu gamma the latter one has the largest branching ratio in (i) SO(10) type I see-saw models and in (ii) scenarios in which the triplet term dominates in the neutrino mass matrix.

Werner Rodejohann

2008-04-24

186

Low-Scale See-Saw Mechanisms for Light Neutrinos  

E-print Network

Alternatives to the see-saw mechanism are explored in supersymmetric models with three right-handed or sterile neutrinos. Tree-level Yukawa couplings can be drastically suppressed in a natural way to give sub-eV Dirac neutrino masses. If, in addition, a B-L gauge symmetry broken at a large scale M_G is introduced, a wider range of possibilities opens up. The value of the right-handed neutrino mass M_R can be easily disentangled from that of M_G. Dirac and Majorana neutrino masses at the eV scale can be generated radiatively through the exchange of sneutrinos and neutralinos. Dirac masses m_D owe their smallness to the pattern of light-heavy scales in the neutralino mass matrix. The smallness of the Majorana masses m_L is linked to a similar see-saw pattern in the sneutrino mass matrix. Two distinct scenarios emerge. In the first, with very small or vanishing M_R, the physical neutrino eigenstates are, for each generation, either two light Majorana states with mixing angle ranging from very small to maximal, depending on the ratio m_D/M_R, or one light Dirac state. In the second scenario, with a large value of M_R, the physical eigenstates are two nearly unmixed Majorana states with masses \\sim m_L and \\sim M_R. In both cases, the (B-L)-breaking scale M_G is, in general, much smaller than that in the traditional see-saw mechanism.

Francesca Borzumati; Yasunori Nomura

2000-07-03

187

A New Measure, Scale Invariance and See Saw Cosmology  

E-print Network

The cosmological constant problem and the possibility of obtaining a see saw cosmological effect, where the effective vacuum energy is highly suppressed by the existence of a large scale is investigated in the context of scale-invariant, generally covariant theory. Scale invariance is considered in the context of a gravitational theory where the action, in the first order formalism, is of the form $S = \\int L_{1} \\Phi d^4x$ + $\\int L_{2}\\sqrt{-g}d^4x$ where $\\Phi$ is a density built out of degrees of freedom independent of the metric.

E. I. Guendelman

2001-06-11

188

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

189

See-saw Enhancement of Neutrino Mixing due to the Right-handed Phases  

E-print Network

We study the see-saw enhancement mechanism in presence of the right-handed phases of the Dirac neutrino mass matrix and the Majorana mass matrix. The enhancement condition given by Smirnov is modified. We point out that the see-saw enhancement could be obtained due to the right-handed phases even if the Majorana matrix is proportional to the unit matrix. We show a realistic Dirac mass matrix which causes the see-saw enhancement.

Morimitsu Tanimoto

1995-03-14

190

Silicon saw-tooth refractive lens for high-energy x-rays made using a diamond saw.  

SciTech Connect

Silicon is a material well suited for refractive lenses operating at high X-ray energies (>50 keV), particularly if implemented in a single-crystal form to minimize small-angle scattering. A single-crystal silicon saw-tooth refractive lens, fabricated by a dicing process using a thin diamond wheel, was tested with 115 keV X-rays, giving an ideal 17 {mu}m line focus width in a long focal length, 2:1 ratio demagnification geometry, with a source-to-focus distance of 58.5 m. The fabrication is simple, using resources typically available at any synchrotron facility's optics shop.

Said, A. H.; Shastri, S. D.; X-Ray Science Division

2010-01-01

191

Electroweak constraints on see-saw messengers and their implications for LHC  

E-print Network

We review the present electroweak precision data constraints on the mediators of the three types of see-saw mechanisms. Except in the see-saw mechanism of type I, with the heavy neutrino singlets being mainly produced through their mixing with the Standard Model leptons, LHC will be able to discover or put limits on new scalar (see-saw of type II) and lepton (see-saw of type III) triplets near the TeV. If discovered, it may be possible in the simplest models to measure the light neutrino mass and mixing properties that neutrino oscillation experiments are insensitive to.

F. del Aguila; J. A. Aguilar-Saavedra; J. de Blas; M. Perez-Victoria

2008-06-05

192

An Improved Performance Frequency Estimation Algorithm for Passive Wireless SAW Resonant Sensors  

PubMed Central

Passive wireless surface acoustic wave (SAW) resonant sensors are suitable for applications in harsh environments. The traditional SAW resonant sensor system requires, however, Fourier transformation (FT) which has a resolution restriction and decreases the accuracy. In order to improve the accuracy and resolution of the measurement, the singular value decomposition (SVD)-based frequency estimation algorithm is applied for wireless SAW resonant sensor responses, which is a combination of a single tone undamped and damped sinusoid signal with the same frequency. Compared with the FT algorithm, the accuracy and the resolution of the method used in the self-developed wireless SAW resonant sensor system are validated. PMID:25429410

Liu, Boquan; Zhang, Chenrui; Ji, Xiaojun; Chen, Jing; Han, Tao

2014-01-01

193

Unusual suicides with band saws: two case reports and a literature review.  

PubMed

Suicides or suicide attempts with power saws (band, circular or chain saws) are rather rare events and only a few case reports exist in the forensic literature. The use of a band saw, in particular, has been extremely rare in cases of suicide. We report two cases of suicide that occurred in the same suburban area, three years apart. In each case, the victim was a carpenter and had a history of psychiatric disorder and/or of prior suicide attempts. We summarize the findings of the death scene investigations, the pertinent autopsy findings, and also summarize the world literature pertaining to suicide committed with power saws. PMID:19019591

Gloulou, Fatma; Allouche, Mohamed; Khelil, Mehdi Ben; Bekir, Olfa; Banasr, Ahmed; Zhioua, Mongi; Hamdoun, Moncef

2009-01-10

194

Corrosion inhibitors for water-base slurry in multiblade sawing  

NASA Technical Reports Server (NTRS)

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.

1982-01-01

195

A See-Saw Mechanism with light sterile neutrinos  

E-print Network

The usual see-saw mechanism for the generation of light neutrino masses is based on the assumption that all of the flavours of right-handed (more properly, sterile) neutrinos are heavy. If the sterile Majorana mass matrix is singular, one or more of the sterile neutrinos will have zero mass before mixing with the active (left-handed) neutrinos and be light after that mixing is introduced. In particular, a rank 1 sterile mass matrix leads naturally to two pseudo-Dirac pairs, one very light active Majorana neutrino and one heavy sterile Majorana neutrino. For any pattern of Dirac masses, there exists a region of parameter space in which the two pseudo-Dirac pairs are nearly degenerate in mass. This, in turn, leads to large amplitude mixing of active states as well as mixing into sterile states.

B. H. J. McKellar; G. J. Stephenson Jr; T. Goldman; M. Garbutt

2001-06-12

196

Type-III see-saw at LHC  

E-print Network

Neutrino masses can be generated by fermion triplets with TeV-scale mass, that would manifest at LHC as production of two leptons together with two heavy SM vectors or higgs, giving rise to final states such as 2 leptons + 4 jets (that can violate lepton number and/or lepton flavor) or 1 lepton +4 jets +missing transverse energy. We devise cuts to suppress the SM backgrounds to these signatures. Furthermore, for most of the mass range suggested by neutrino data, triplet decays are detectably displaced from the production point, allowing to infer the neutrino mass parameters. We compare with LHC signals of type-I and type-II see-saw.

Roberto Franceschini; Thomas Hambye; Alessandro Strumia

2008-05-12

197

Predictions of the most minimal see-saw model  

E-print Network

We derive the most minimal see-saw texture from an extra-dimensional dynamics. It predicts theta_13 = 0.078 \\pm 0.015 and m_ee = 2.6 \\pm 0.4 meV. Assuming thermal leptogenesis, the sign of the CP-phase measurable in neutrino oscillations, together with the sign of baryon asymmetry, determines the order of heavy neutrino masses. Unless heavy neutrinos are almost degenerate, successful leptogenesis fixes the lightest mass. Depending on the sign of the neutrino CP-phase, the supersymmetric version of the model with universal soft terms at high scale predicts BR(mu --> e gamma) or BR(tau --> mu gamma), and gives a lower bound on the other process.

M. Raidal; A. Strumia

2002-10-01

198

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

PubMed

This paper presents the design and measurement of a SAW device to be used in a correlator receiver for a differential phase shift keying direct sequence spread spectrum (DPSK/DSSS) system. The DPSK modulation format allows 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 contains a correlator, and the other path contains a one data bit delay element and another correlator. The outputs of both paths are then fed to a noncoherent data demodulator. The device presented in this paper combines both the delay element and the two correlators in a single SAW device; therefore, a better temperature tracking mechanism, simplicity, as well as the elimination of the broadband SAW delay line are achieved. The SAW structure contains a broadband SAW transducer, and two serially coded pseudo noise (PN) DPSK filters. The SAW based correlator was built on lithium tantalate. The center frequency was set to 150 MHz, with a 63 chip PN spreading code and a data rate of 300 Kbps. Experimental measurements of the SAW device autocorrelation results are presented. PMID:18244204

Moeller, F; Belkerdid, M A; Malocha, D C; Buff, W

1998-01-01

199

Separation of biological cells in a microfluidic device using surface acoustic waves (SAWs)  

NASA Astrophysics Data System (ADS)

In this study, a surface acoustic wave (SAW)-based microfluidic device has been developed to separate heterogeneous particle or cell mixtures in a continuous flow using acoustophoresis. The microfluidic device is comprised of two components, a SAW transducer and a microfluidic channel made of polydimethylsiloxane (PDMS). The SAW transducer was fabricated by patterning two pairs of interdigital electrodes on a lithium niobate (LiNbO3) piezoelectric substrate. When exciting the SAW transducer by AC signals, a standing SAW is generated along the cross-section of the channel. Solid particles immersed in the standing SAW field are accordingly pushed to the pressure node arising from the acoustic radiation force acting on the particles, referring to the acoustic particle-focusing phenomenon. Acoustic radiation force highly depends on the particle properties, resulting in different acoustic responses for different types of cells. A numerical model, coupling the piezoelectric effect in the solid substrate and acoustic pressure in the fluid, was developed to provide a better understanding of SAW-based particle manipulation. Separation of two types of fluorescent particles has been demonstrated using the developed SAW-based microfluidic device. An efficient separation of E. coli bacteria from peripheral blood mononuclear cell (PBMC) samples has also been successfully achieved. The purity of separated E. coli bacteria and separated PBMCs were over 95% and 91%, respectively, obtained by a flow cytometric analysis. The developed microfluidic device can efficiently separate E. coli bacteria from biological samples, which has potential applications in biomedical analysis and clinical diagnosis.

Ai, Ye; Marrone, Babetta L.

2014-03-01

200

Avoiding the gauge heirarchy problem with see-sawed neutrino masses  

E-print Network

We show that the see-saw neutrino mass mechanism can coexist naturally with an extended gauge symmetry (i.e. without any gauge heirarchy problem) provided that the gauge symmetry contains gauged lepton number differences. The simplest such `natural' see-saw models are constructed and their implications for neutrino anomalies discussed.

R. Foot

2005-05-18

201

Wireless sensing using oscillator circuits locked to remote high-Q SAW resonators  

Microsoft Academic Search

This paper introduces a method of wireless read out of high Q surface acoustic wave (SAW) resonator sensors. The resonator is excited by a short RF pulse and decays after switching off the interrogating signal. In the measurement system, a gated phase locked loop (GPLL) locks to the resonance frequency of the SAW resonator within a few bursts. Then the

Alfred Pohl; Gerald Ostermayer; Franz Seifert

1998-01-01

202

Radio signals for SAW ID tags and sensors in strong electromagnetic interference  

Microsoft Academic Search

The applicability of wirelessly interrogated passive ID-tag type SAW sensors for measurements of the temperature of disc brakes of moving railway cars is shown. Here, a short radio channel allows relatively simple radio impulse processing by phase evaluation. Further, using elastic convolver measurement in large steel works, we discuss the feasibility of passive SAW sensors in a severely obstructed radio

A. Pohl; F. Seifert; L. Reindl; G. Scholl; T. Ostertag; W. Pietsch

1994-01-01

203

Finite Element Modelling of the Sawing of DC Cast AA2024 Aluminium Alloy Slabs  

SciTech Connect

In the semi-continuous casting of large cross-section rolling sheet ingots of high-strength aluminum alloys (2xxx and 7xxx series), the control of the residual (internal) stresses generated by the non-uniform cooling becomes a necessity. These stresses must be relieved by a thermal treatment before the head and foot of the ingot can be cut. Otherwise, the saw can be caught owing to compressive stresses or cut parts may be ejected thus injuring people or damaging equipment. These high added-value ingots need to be produced in secure conditions. Moreover, a better control of the sawing procedure could allow the suppression of the thermal treatment and therefore save time and energy. By studying the stress build-up during casting and the stress relief during sawing, key parameters for the control and optimization of the processing steps, can be derived. To do so, the direct chill (DC) casting of the AA2024 alloy is modeled with ABAQUS 6.5 with special attention to the thermo-mechanical properties of the alloy. The sawing operation is then simulated by removing mesh elements so as to reproduce the progression of the saw in the ingot. Preliminary results showing the stress relief during sawing accompanied by the risk of saw blocking due to compression or initiating a crack ahead of the saw, are analyzed with an approach based on the rate of strain energy release.

Drezet, J.-M. [Computational Materials Laboratory, School of Engineering, Ecole Polytechnique Federale de Lausanne, Station 12, CH-1015 Lausanne (Switzerland); Ludwig, O. [Calcom-ESI SA, PSE-A, CH-1015 Lausanne (Switzerland); Heinrich, B. [Alcan Aluminium Valais SA, CH3960 Sierre (Switzerland)

2007-04-07

204

Fabrication of polymer SAW sensor array to classify chemical warfare agents  

Microsoft Academic Search

An array with five SAW sensors using different kinds of polymers was fabricated to detect chemical agents and their gas response characteristics were extensively investigated. The SAW devices with different interdigital transducer (IDT) electrode line widths of 3, 4, 6, 8 and 20?m, which corresponded to the central frequencies of 264, 198, 132, 99 and 39.6MHz, respectively, were designed. The

Byung-Su Joo; Jeung-Soo Huh; Duk-Dong Lee

2007-01-01

205

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

206

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

Federal Register 2010, 2011, 2012, 2013, 2014

...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

207

Assessment of Present State-of-the-art Sawing Technology of Large Diameter Ingots for Solar Sheet Material  

NASA Technical Reports Server (NTRS)

Work is reported on: (1) slicing of the ingots with the multiblade slurry saw, the multiwire slurry saw and the I.D. saw, (2) characterization of the sliced wafers, and (3) analysis of add-on slicing cost based on Solar Array Manufacturing Industry Costing Standard.

Yoo, H. I.

1978-01-01

208

Comparative ecology of the Flammulated Owl and Northern Saw-whet Owl during fall migration  

USGS Publications Warehouse

We compared the migration ecology of two owl species that exhibit different migration strategies: the Flammulated Owl (Otus flammeolus) and the Northern Saw-whet Owl (Aegolius acadicus). During fall 1999-2004, we captured 117 Flammulated Owls and 1433 Northern Saw-whet Owls in the southern Boise Mountains of southwestern Idaho. These owl species exhibited contrasting seasonal timing and body condition. Flammulated Owl captures peaked in mid-September and Northern Saw-whet Owl captures peaked in early to mid-October. Flammulated Owls displayed greater body condition than Northern Saw-whet Owls and increasing condition scores during the season, whereas Northern Saw-whet Owls had no apparent seasonal condition patterns. Based on seasonal timing of captures, both species showed unimodal movement patterns characteristic of fall migrants. However, in 1999 both species' capture rates were at least double those in other years of this study. Flammulated Owls' earlier arrival and departure, coupled with superior body condition, were consistent among years and typical of a long-distance migration strategy. In contrast, the Northern Saw-whet Owls' later arrival, more lengthy passage, and variable body condition were more characteristic of a short-distance migrant strategy. Furthermore, Northern Saw-whet Owls' body condition was significantly lower during the irruptive year than during nonirruptive years, supporting the notion that population density affects their migratory condition. ?? 2006 The Raptor Research Foundation, Inc.

Stock, S.L.; Heglund, P.J.; Kaltenecker, G.S.; Carlisle, J.D.; Leppert, L.

2006-01-01

209

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

210

A radiation detector design mitigating problems related to sawed edges  

NASA Astrophysics Data System (ADS)

In pixelated silicon radiation detectors that are utilized for the detection of UV, visible, and in particular Near Infra-Red (NIR) light it is desirable to utilize a relatively thick fully depleted Back-Side Illuminated (BSI) detector design providing 100% Fill Factor (FF), low Cross-Talk (CT), and high Quantum Efficiency (QE). The optimal thickness of such detectors is typically less than 300?m and above 40?m and thus it is more or less mandatory to thin the detector wafer from the backside after the front side of the detector has been processed and before a conductive layer is formed on the backside. A TAIKO thinning process is optimal for such a thickness range since neither a support substrate on the front side nor lithographic steps on the backside are required. The conductive backside layer should, however, be homogenous throughout the wafer and it should be biased from the front side of the detector. In order to provide good QE for blue and UV light the conductive backside layer should be of opposite doping type than the substrate. The problem with a homogeneous backside layer being of opposite doping type than the substrate is that a lot of leakage current is typically generated at the sawed chip edges, which may increase the dark noise and the power consumption. These problems are substantially mitigated with a proposed detector edge arrangement which 2D simulation results are presented in this paper.

Aurola, A.; Marochkin, V.; Tuuva, T.

2014-12-01

211

The electron and neutron EDM from supersymmetric see-saw thresholds  

E-print Network

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 A and B 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.

Gian F. Giudice; Paride Paradisi; Alessandro Strumia

2010-03-11

212

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

213

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

E-print Network

board removed) 5. Photograph of Ssw Cylinder being Sharpened 6. Photograph of Seed Cleaner 7. Schematic of Test, Set-up 8. Photograph oi Seed Scales 9. Photograph of Wattmeter 10. Photograph of Baling Press 11. Photograph of Fractionating Shaker... 'I L Figure ~ Operating conditions for the Butters Rebuilt- Carver 141 Saw Linter were as follows: (1) Float at 525 r. p. m. (2) Saw Cylinder at 665 r. p. m. ($) Brush Cylinder at 9/8 r. p. m. (0) "M" Shaft s. t gg4 r. p. m. (5) Float to saw...

Luedtke, Charles G

2012-06-07

214

Aluminum nitride deposition / characterization & pMEMS / saw device simulation / fabrication.  

E-print Network

??Aluminum Nitride (AlN) is a promising material for piezoelectric MicroElectroMechanical Systems (pMEMS) and Surface Acoustic Wave (SAW) devices. AlN is a direct bandgap semiconductor possessing… (more)

Paga?n, Vincent Richard.

2009-01-01

215

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

216

Study of a high-precision SAW-MOEMS strain sensor with laser optics  

NASA Astrophysics Data System (ADS)

A novel structure design of a surface acoustic wave (SAW) micro-optic-electro-mechanical-system (MOEMS) strain sensor with a light readout unit is presented in this paper. By measuring the polarization intensity ratio of the TE/TM mode outputted from the waveguide, the strain produced from an object can be measured precisely. The basic working principle of the SAW MOEMS strain sensor is introduced and the mathematical model of the strain sensor system is established. The SAW characteristics effected by the strain sensor are mathematically deduced. The coupling coefficient between the SAW modes and light modes can be calculated based on the theory of coupling modes. The conversion coefficient of polarized light modes is obtained. Due to the restrictions of the specific parameters of the device, the level of technology and the material characteristics, the sensitivity of the strain sensor system is calculated through simulation as 0.1???, with a dynamic range of 0 ~ ±50???.

Liu, Xinwei; Chen, Shufen; Li, Honglang; Zou, Zhengfeng; Fu, Lei; Meng, Yanbin

2015-02-01

217

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

218

The effects of Saw palmetto on flumethrin-induced lipid peroxidation in rats  

Microsoft Academic Search

In the present study, 40 male Wistar albino rats were used and divided into 4 groups. The first group served as the control group; the second group was administered Saw palmetto extract at the dose of 20mg\\/kg\\/bw; the third group was administered flumethrin at the dose of 15mg\\/kg\\/bw; and the fourth group was administered a combination of 20mg\\/kg\\/bw Saw palmetto

Murat Kanbur; Gökhan Eraslan; Zeynep Soyer Sarica; ?ule Altinordulu

2010-01-01

219

Symplectic Symmetry of the Neutrino Mass and the See-Saw Mechanism  

E-print Network

We investigate the algebraic structure of the most general neutrino mass Hamiltonian and place the see-saw mechanism in an algebraic framework. We show that this Hamiltonian can be written in terms of the generators of an Sp(4) algebra. The Pauli-Gursey transformation is an SU(2) rotation which is embedded in this Sp(4) group. This SU(2) also generates the see-saw mechanism.

A. B. Balantekin; N. Ozturk

2000-03-28

220

A generalized impulse response model for SAW transducers including effects of electrode reflections  

Microsoft Academic Search

Closed-form expressions are presented which describe the behavior of arbitrarily weighted SAW (surface acoustic wave) transducers that contain uniform internal reflections. These expressions are based on a coupling-of-modes model of a SAW transducer and are expressed in terms of the Fourier transform of the transducer weighting function with respect to a modified frequency variable. This is the same Fourier transform

C. S. Hartmann; B. P. Abbott

1988-01-01

221

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

222

Evaluation of the Sagittal Saw Blade as an Intraoperative Fomite During Diabetic Foot Surgery.  

PubMed

Surgical site infection is a major potential complication of all operative interventions, and the diabetic foot is particularly at risk for bacterial recontamination and infectious sequelae. The objective of this study was to identify whether the sagittal saw blade used during partial foot amputations and diabetic foot debridements carries the potential to serve as a bacterial fomite. We physically cultured the sagittal saw blade during 20 foot debridements involving the resection of bone in patients diagnosed with a diabetic foot infection. The culture was taken after the initial debridement and during the irrigation phase of the procedure. We observed 16 positive routine intraoperative culture results, with positive saw blade culture results in 15 (93.8%; 15/16) of these cases. In 14 (93.3%; 14/15) of these cases, the saw blade culture grew at least one of the same bacteria as our other routine intraoperative cultures. We observed 4 negative routine intraoperative culture results, with negative saw blade culture results in 3 (75.0%; 3/4) of these cases. This results in agreement between routine intraoperative cultures and saw blade culture of 85.0% (17/20). The results of this investigation demonstrate that the sagittal saw blade used for osseous resection during diabetic foot debridements and partial foot amputations carries the potential for intraoperative bacterial transmission. We recommend changing at least the sagittal saw blade if more bone is resected following irrigation, particularly if it is used to obtain a "clean margin" for microbiological or histological examination. PMID:25428180

Creech, Corine L; Malan, Jared R; Meyr, Andrew J

2014-11-26

223

Ultra-wideband communication system prototype using orthogonal frequency coded SAW correlators.  

PubMed

This paper presents preliminary ultra-wideband (UWB) communication system results utilizing orthogonal frequency coded SAW correlators. Orthogonal frequency coding (OFC) and pseudo-noise (PN) coding provides a means for spread-spectrum UWB. The use of OFC spectrally spreads a PN sequence beyond that of CDMA; allowing for improved correlation gain. The transceiver approach is still very similar to that of the CDMA approach, but provides greater code diversity. Use of SAW correlators eliminates many of the costly components that are typically needed in the intermediate frequency (IF) section in the transmitter and receiver, and greatly reduces the signal processing requirements. Development and results of an experimental prototype system with center frequency of 250 MHz are presented. The prototype system is configured using modular RF components and benchtop pulse generator and frequency source. The SAW correlation filters used in the test setup were designed using 7 chip frequencies within the transducer. The fractional bandwidth of approximately 29% was implemented to exceed the defined UWB specification. Discussion of the filter design and results are presented and are compared with packaged device measurements. A prototype UWB system using OFC SAW correlators is demonstrated in wired and wireless configurations. OFC-coded SAW filters are used for generation of a transmitted spread-spectrum UWB and matched filter correlated reception. Autocorrelation and cross-correlation system outputs are compared. The results demonstrate the feasibility of UWB SAW correlators for use in UWB communication transceivers. PMID:23475929

Gallagher, Daniel R; Kozlovski, Nikolai Y; Malocha, Donald C

2013-03-01

224

UV epoxy bonding for enhanced SAW transmission and microscale acoustofluidic integration.  

PubMed

Surface acoustic waves (SAWs) are appealing as a means to manipulate fluids within lab-on-a-chip systems. However, current acoustofluidic devices almost universally rely on elastomeric materials, especially PDMS, that are inherently ill-suited for conveyance of elastic energy due to their strong attenuation properties. Here, we explore the use of a low-viscosity UV epoxy resin for room temperature bonding of lithium niobate (LiNbO(3)), the most widely used anisotropic piezoelectric substrate used in the generation of SAWs, to standard micromachined superstrates such as Pyrex® and silicon. The bonding methodology is straightforward and allows for reliable production of sub-micron bonds that are capable of enduring the high surface strains and accelerations needed for conveyance of SAWs. Devices prepared with this approach display as much as two orders of magnitude, or 20 dB, improvement in SAW transmission compared to those fabricated using the standard PDMS elastomer. This enhancement enables a broad range of applications in acoustofluidics that are consistent with the low power requirements of portable battery-driven circuits and the development of genuinely portable lab-on-a-chip devices. The method is exemplified in the fabrication of a closed-loop bidirectional SAW pumping concept with applications in micro-scale flow control, and represents the first demonstration of closed channel SAW pumping in a bonded glass/LiNbO(3) device. PMID:22695680

Langelier, Sean M; Yeo, Leslie Y; Friend, James

2012-08-21

225

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

226

Sensors and Actuators B 111112 (2005) 207212 Highly sensitive layered ZnO/LiNbO3 SAW device with InOx  

E-print Network

Sensors and Actuators B 111­112 (2005) 207­212 Highly sensitive layered ZnO/LiNbO3 SAW device August 2005 Abstract Layered surface acoustic wave (SAW) devices for the monitoring of NO2 and H2 of the layered SAW structure with the DC sputtered InOx thin film. The surface of the layered SAW structure

227

Hardin, Craig William. Fixed Abrasive Diamond Wire Saw Slicing of Single Crystal SiC Wafers and Wood. (Under the direction of Dr. Albert Shih)  

E-print Network

ABSTRACT Hardin, Craig William. Fixed Abrasive Diamond Wire Saw Slicing of Single Crystal SiC diamond wire saw to machine single crystal SiC wafers. The next experiments use a Murg looped wire saw Abrasive Diamond Wire Saw Slicing of Single Crystal SiC Wafers and Wood by Craig William Hardin A thesis

Shih, Albert J.

228

Phenomenological consequences of sub-leading terms in see-saw formulas  

NASA Astrophysics Data System (ADS)

Several aspects of next-to-leading (NLO) order corrections to see-saw formulas are discussed and phenomenologically relevant situations are identified. We generalize the formalism to calculate the NLO terms developed for the type I see-saw to variants like the inverse, double or linear see-saw, i.e., to cases in which more than two mass scales are present. In the standard type I case with very heavy fermion singlets the sub-leading terms are negligible. However, effects in the percent regime are possible when sub-matrices of the complete neutral fermion mass matrix obey a moderate hierarchy, e.g. weak scale and TeV scale. Examples are cancellations of large terms leading to small neutrino masses, or inverse see-saw scenarios. We furthermore identify situations in which no NLO corrections to certain observables arise, namely for ?- ? symmetry and cases with a vanishing neutrino mass. Finally, we emphasize that the unavoidable unitarity violation in see-saw scenarios with extra fermions can be calculated with the formalism in a straightforward manner.

Hettmansperger, Hans; Lindner, Manfred; Rodejohann, Werner

2011-04-01

229

Type II See-Saw Mechanism, Deviations from Bimaximal Neutrino Mixing and Leptogenesis  

E-print Network

A possible interplay of both terms in the type II see-saw formula is illustrated by presenting a novel way to generate deviations from exact bimaximal neutrino mixing. In type II see-saw mechanism with dominance of the non-canonical SU(2)_L triplet term, the conventional see-saw term can give a small contribution to the neutrino mass matrix. If the triplet term corresponds to the bimaximal mixing scheme in the normal hierarchy, the small contribution of the conventional see-saw term naturally generates non-maximal solar neutrino mixing. Atmospheric neutrino mixing is also reduced from maximal, corresponding to 1 - \\sin^2 2 \\theta_{23} of order 0.01. Also, small but non-vanishing U_{e3} of order 0.001 is obtained. It is also possible that the \\Delta m^2 responsible for solar neutrino oscillations is induced by the small conventional see-saw term. Larger deviations from zero U_{e3} and from maximal atmospheric neutrino mixing are then expected. This scenario links the small ratio of the solar and atmospheric \\Delta m^2 with the deviation from maximal solar neutrino mixing. We comment on leptogenesis in this scenario and compare the contributions to the decay asymmetry of the heavy Majorana neutrinos as induced by themselves and by the triplet.

W. Rodejohann

2004-03-22

230

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

231

Phenomenological Consequences of sub-leading Terms in See-Saw Formulas  

E-print Network

Several aspects of next-to-leading (NLO) order corrections to see-saw formulas are discussed and phenomenologically relevant situations are identified. We generalize the formalism to calculate the NLO terms developed for the type I see-saw to variants like the inverse, double or linear see-saw, i.e., to cases in which more than two mass scales are present. In the standard type I case with very heavy fermion singlets the sub-leading terms are negligible. However, effects in the percent regime are possible when sub-matrices of the complete neutral fermion mass matrix obey a moderate hierarchy, e.g. weak scale and TeV scale. Examples are cancellations of large terms leading to small neutrino masses, or inverse see-saw scenarios. We furthermore identify situations in which no NLO corrections to certain observables arise, namely for mu-tau symmetry and cases with a vanishing neutrino mass. Finally, we emphasize that the unavoidable unitarity violation in see-saw scenarios with extra fermions can be calculated with the formalism in a straightforward manner.

Hans Hettmansperger; Manfred Lindner; Werner Rodejohann

2011-02-16

232

Comparison of saw ginning and high-speed roller ginning with different lint cleaners of mid-south grown cotton  

Technology Transfer Automated Retrieval System (TEKTRAN)

Four cotton cultivars were ginned with a saw-gin equipment line and also with a high-speed roller-gin line. The saw-gin line using an air-jet and controlled-batt saw-type lint cleaner was compared to the high-speed roller-gin line using two versions of an experimental lint cleaner, of a basic design...

233

Assessment of present state-of-the-art sawing technology of large diameter ingots for solar sheet material  

NASA Technical Reports Server (NTRS)

The objective of this program is to assess the present state-of-the-art sawing technology of large diameter silicon ingots (3 inch and 4 inch diameter) for solar sheet materials. During this period, work has progressed in three areas: (1) slicing of the ingots with the multiblade slurry saw and the I.D. saw, (2) characterization of the sliced wafers, and (3) analysis of direct labor, expendable material costs, and wafer productivity.

Yoo, H. I.

1977-01-01

234

Comparative study of SAW temperature sensor based on different piezoelectric materials and crystal cuts for passive wireless measurement  

Microsoft Academic Search

As widely reported substrates for surface acoustic wave (SAW) temperature sensors, YX-cut quartz, YZ-cut LiNbO3 and 128°YX-cut LiNbO3 are selected to fabricate different one-port SAW resonator temperature sensors and comprehensive comparative studies of their performance and specifications are conducted carefully in this paper. Firstly, SAW sensors of each cut with 50 different layouts were designed and fabricated according to the

Xuesong Ye; Qiong Wang; Lu Fang; Xuejun Wang; Bo Liang

2010-01-01

235

Electroweak Symmetry Breaking from SUSY Breaking with Bosonic See-Saw Mechanism  

E-print Network

We introduce the idea of bosonic see-saw mechanism in analogy with the see-saw mechanism. Bosonic see-saw is a new symmetry breaking mechanism and we apply it to explain electroweak symmetry breaking as an inevitable consequence of supersymmetry breaking. The breaking of electroweak symmetry occurs at tree level once supersymmetry is broken. Absence of color/charge breaking in this model is related to doublet-triplet splitting in grand unified theory. An extension of MSSM with a weak triplet shows very interesting results especially when mu =0. It provides the most natural understanding of why we have only electroweak symmetry breaking rather than having color/charge breaking. In the limit mu=0, the model predicts very light chargino mass, 104 GeV while Higgs is heavy, 130 GeV.

Hyung Do Kim

2005-01-10

236

Bosonic See-Saw Mechanism and Its Application to Supersymmetry and Technicolor  

SciTech Connect

We introduce the idea of bosonic see-saw mechanism in analogy with the see-saw mechanism. Bosonic see-saw is a new symmetry breaking mechanism and we apply it to explain electroweak symmetry breaking as an inevitable consequence of supersymmetry breaking. The breaking of electroweak symmetry occurs at tree level once supersymmetry is broken. Absence of color/charge breaking in this model is related to doublet-triplet splitting in grand unified theory. An extension of MSSM with a weak triplet shows very interesting results especially when {mu} = 0. It provides the most natural understanding of why we have only electroweak symmetry breaking rather than having color/charge breaking. In the limit {mu} = 0, the model predicts very light chargino mass, 104 GeV while Higgs is heavy, 130 GeV. Finally we mention the possibility of applying the same idea to technicolor idea.

Kim, Hyung Do [School of Physics, Seoul National University, Seoul 151-747 (Korea, Republic of)

2005-12-02

237

Enhanced spectral efficiency using bandwidth switchable SAW filtering for mobile satellite communications systems  

NASA Technical Reports Server (NTRS)

Currently proposed mobile satellite communications systems require a high degree of flexibility in assignment of spectral capacity to different geographic locations. Conventionally this results in poor spectral efficiency which may be overcome by the use of bandwidth switchable filtering. Surface acoustic wave (SAW) technology makes it possible to provide banks of filters whose responses may be contiguously combined to form variable bandwidth filters with constant amplitude and phase responses across the entire band. The high selectivity possible with SAW filters, combined with the variable bandwidth capability, makes it possible to achieve spectral efficiencies over the allocated bandwidths of greater than 90 percent, while retaining full system flexibility. Bandwidth switchable SAW filtering (BSSF) achieves these gains with a negligible increase in hardware complexity.

Peach, Robert; Malarky, Alastair

1990-01-01

238

Development of a high-sensitivity strain measurement system based on a SH SAW sensor  

NASA Astrophysics Data System (ADS)

A strain measurement system based on a shear horizontal surface acoustic wave (SH SAW) was developed. The developed system is composed of a SAW microsensor, a printed circuit board (PCB), an adhesive and a strain gauge. When a compression force is applied to the PCB by the strain gauge, the PCB is bent so that external strain energy can be evenly delivered to the microsensor without any detachment of the sensor from the board. When a stretching force is applied to the PCB under the condition that one side of the PCB is fixed and the other side is modulated, the actual length of the SAW delay line between the two interdigital transducers (IDTs) is increased. The increase in the delay line length causes a change in the time for the propagating SAW to reach the output IDT. If strain energy is applied to the piezoelectric substrate, the substrate density is changed, which then changes the propagation velocity of the SAW. Coupling-of-modes modeling was conducted prior to fabrication to determine the optimal device parameters. Depending on the strain, the frequency difference was linearly modulated. The obtained sensitivity for stretching was 17.3 kHz/% for the SH wave mode and split electrode. And the obtained sensitivity for bending was 46.1 kHz/% for the SH wave mode and split electrode. The SH wave showed about 15% higher sensitivity than the Rayleigh wave, and the dog-bone PCB showed about 8% higher sensitivity than the rectangular PCB. The obtained sensitivity was about five times higher than that of existing SAW-based strain sensors.

Oh, Haekwan; Lee, Keekeun; Eun, Kyoungtae; Choa, Sung-Hoon; Yang, Sang Sik

2012-02-01

239

FEM/BEM impedance and power analysis for measured LGS SH-SAW devices.  

PubMed

Pure shear horizontal piezoelectrically active surface and bulk acoustic waves (SH-SAW and SH-BAW) exist along rotated Y-cuts, Euler angles (0 degrees, theta, 90 degrees), of trigonal class 32 group crystals, which include the LGX family of crystals (langasite, langatate, and langanite). In this paper both SH-SAW and SH-BAW generated by finite-length, interdigital transducers (IDTs) on langasite, Euler angles (0 degrees, 22 degrees, 90 degrees), are simulated using combined finite- and boundary-element methods (FEM/BEM). Aluminum and gold IDT electrodes ranging in thickness from 600 A to 2000 A have been simulated, fabricated, and tested, with both free and metalized surfaces outside the IDT regions considered. Around the device's operating frequency, the percent difference between the calculated IDT impedance magnitude using the FEM/BEM model and the measurements is better than 5% for the different metal layers and thicknesses considered. The proportioning of SH-SAW and SH-BAW power is analyzed as a function of the number of IDT electrodes; type of electrode metal; and relative thickness of the electrode film, h/wavelength, where wavelength is the SH-SAW wavelength. Simulation results show that moderate mechanical loading by gold electrodes increases the proportion of input power converted to SH-SAW. For example, with a split-electrode IDT, comprising 238 electrodes with a relative thickness h/wavelength = 0.63% and surrounded by an infinitesimally thin conducting film, nearly 9% more input power is radiated as SH-SAW when gold instead of aluminum electrodes are used. PMID:16529115

Kenny, Thomas D; Pollard, Thomas B; Berkenpas, Eric; da Cunha, Mauricio Pereira

2006-02-01

240

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

241

Slanted and saw-toothed stator poles for improved performance of doubly salient permanent magnet motor  

NASA Astrophysics Data System (ADS)

This paper presents the results of extensive finite element analyses conducted on doubly salient permanent magnet motor (DSPM) for improving the torque characteristics by novel methods; namely (i) slanted stator pole and (ii) saw-toothed stator pole. In the first method, stator poles are given a slant at the pole face; the slant in a direction opposite to the rotation of the motor has resulted in 7.33% and 71.45% increase in the average and maximum torques, respectively, when compared with the motor with original stator poles. With appropriate saw-tooth shaped stator poles, various permanent magnet torque and static torque profiles can be achieved.

Babu, A. R. C. Sekhar; Rajagopal, K. R.

2005-05-01

242

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

243

See-Saw Masses for Quarks and Leptons in SU(5)  

E-print Network

We build on a recent paper by Grinstein, Redi and Villadoro, where a see-saw like mechanism for quark masses was derived in the context of spontaneously broken gauged flavour symmetries. The see-saw mechanism is induced by heavy Dirac fermions which are added to the Standard Model spectrum in order to render the flavour symmetries anomaly-free. In this letter we report on the embedding of these fermions into multiplets of an SU(5) grand unified theory and discuss a number of interesting consequences.

Thorsten Feldmann

2010-10-11

244

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

245

Effects of Friction Reduction on Fiber Damage in a Saw-Type Lint Cleaner  

Technology Transfer Automated Retrieval System (TEKTRAN)

U.S. cotton is at a competitive disadvantage from a fiber-quality standpoint, because lint cleaning is required for mechanically harvested cotton, and lint cleaning causes fiber damage. Lint-cleaning research has focused mainly on modifying saw-type lint cleaners, but the work reported here focuses...

246

Interpreting the Effects of Burning on Pre-incineration Saw Marks in Bone.  

PubMed

This study examined the effects of fire on the features associated with saw marks in bone. Both class and individual characteristics were examined using stereomicroscopy and scanning electron microscopy (SEM). Twenty-four semifleshed Sus scrofa L. tibiae were sawed into three sections with the middle section having deep and shallow false starts. Twelve saw blades of varying age and type were each used to cut two tibiae. In each case, the first tibia was burned in an outdoor open fire to the point of partial calcination. The second tibia, our control, was macerated using a heated enzyme solution. Controls and burned specimens were examined for the following characteristics: breakaway spur, tooth hop, false start, exit chipping, tooth imprint, breakaway notch, pull out striae, kerf flare, and blade drift. In general, there was parity in the observed characteristics in the burned samples using the SEM and the stereomicroscope. SEM observation, however, provided enhanced images, with the addition of observing individual tooth imprints, previously not visible. Therefore, this study recommends using an SEM for the examination of saw cuts in burnt bone. PMID:25088190

Robbins, Samantha C; Fairgrieve, Scott I; Oost, Tracy S

2015-01-01

247

SAW-correlator module for spread-spectrum DPSK asynchronous demodulation  

Microsoft Academic Search

Details of the design and performance of a SAW (surface acoustic wave) correlator module for the demodulation of a direct sequence DPSK (differential phase shift keying) modulated spread-spectrum signal are presented. In contrast to convolver solutions, neither reference code nor synchronization is needed. This leads to a low system complexity and a high electromagnetic interference immunity. The module consists of

Peter G. Schelbert

1990-01-01

248

Advances in SAW Gas Sensors Based on the Condensate-Adsorption Effect  

PubMed Central

A surface-acoustic-wave (SAW) gas sensor with a low detection limit and fast response for volatile organic compounds (VOCs) based on the condensate-adsorption effect detection is developed. In this sensor a gas chromatography (GC) column acts as the separator element and a dual-resonator oscillator acts as the detector element. Regarding the surface effective permittivity method, the response mechanism analysis, which relates the condensate-adsorption effect, is performed, leading to the sensor performance prediction prior to fabrication. New designs of SAW resonators, which act as feedback of the oscillator, are devised in order to decrease the insertion loss and to achieve single-mode control, resulting in superior frequency stability of the oscillator. Based on the new phase modulation approach, excellent short-term frequency stability (±3 Hz/s) is achieved with the SAW oscillator by using the 500 MHz dual-port resonator as feedback element. In a sensor experiment investigating formaldehyde detection, the implemented SAW gas sensor exhibits an excellent threshold detection limit as low as 0.38 pg. PMID:22247697

Liu, Jiuling; Wang, Wen; Li, Shunzhou; Liu, Minghua; He, Shitang

2011-01-01

249

A DMTL Phase Shifter Using Insulation Layer and Saw-Shaped CPW  

Microsoft Academic Search

The phase shift features of the RF MEMS phase shifter are described. The approach of adding an insulation layer below the RF MEMS bridge to increase phase shift and improve reliability is proposed, in addition, the saw-shaped CPW is used to decrease the return loss introduced by the insulation layer. By using network theory and CST microwave studio simulation tool,

Qun Wu; Kai Tang; Zi-Rui Feng; Feng-Lin Sun; Le-Wei Li

2007-01-01

250

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

251

Development of low-loss band-pass filters using SAW resonators for portable telephones  

Microsoft Academic Search

A bandpass filter using surface acoustic wave (SAW) resonators in a ladder circuit structure for portable telephone systems is reported. For filter design, a simulation tool is used to consider the effects of electrodes (their apertures, the number of paired elements, thickness, and bulk wave radiation). Filter input and output impedance conditions are designed by the resonator capacitance to match

O. Ikata; T. Miyashita; T. Matsuda; T. Nishihara; Y. Satoh

1992-01-01

252

A See-Saw Mechanism for Large Neutrino Mixing from Small Quark and Lepton Mixings  

E-print Network

I introduce and sketch the main features of those see-saw models where a large atmospheric mixing can be achieved starting from nearly diagonal matrices for charged leptons, Dirac neutrinos and Majorana right-handed neutrinos. It turns out that these models can be realized in Grand Unified Theories and they are well compatible with the related phenomenology of fermion masses and mixings.

Isabella Masina

2000-05-24

253

The see-saw mechanism and heavy Majorana neutrino masses in an SO(10) model  

E-print Network

We apply the see-saw mechanism and an SO(10) model to neutrino masses and mixing in order to estimate the heavy Majorana masses. We discuss shortly the decay modes of heavy Majorana neutrinos and calculate their contribution to the lepton number violating processes \\mu\\to e\\gamma, \\tau\\to\\mu\\gamma and \\tau\\to e\\gamma.

W. Alles; L. Frassinetti

2000-08-09

254

Stability of Texture Zeros under Radiative Corrections in See-Saw Models  

E-print Network

It has been shown that only certain neutrino mass matrices with texture zeros are compatible with existing data. We discuss the stability of phenomenological consequences of texture zeros under radiative corrections in the type-I see-saw scenario. We show that under certain conditions additional patterns are allowed due to these effects.

Claudia Hagedorn; Joern Kersten; Manfred Lindner

2004-06-09

255

Minimal See-Saw Model for Atmospheric and Solar Neutrino Oscillations  

E-print Network

We present a minimal see-saw model based on an extension of the standard model (SM) which includes an additional U(1), with gauge charge $B - \\frac{3}{2} (L_\\mu + L_\\tau)$. Requirement of anomaly cancellation implies the existence of two right-handed singlet neutrinos, carrying this gauge charge, which have normal Dirac couplings to $\

Ernest Ma; D. P. Roy

1998-11-06

256

Anxiety reaction in children during removal of their plaster cast with a saw  

Microsoft Academic Search

e have had experience of an 18-month-old boy with a cardiomyopathy who died a few minutes after removal of his cast with a saw, apparently from a malignant cardiac arrhythmia triggered by anxiety. We therefore examined the anxiety reaction to this method of removal of a plaster cast in 20 healthy children; ten were provided with hearing protectors and ten

K. Katz; R. Fogelman; J. Attias; E. Baron; M. Soudry

2001-01-01

257

Neutrino Oscillation Parameters in a Six-channel Reduced Rank See-Saw  

SciTech Connect

We demonstrate that it is possible to find parameters in a rank one see-saw model which give a reasonable representation of atmospheric neutrino data and of the LSND result. Solar neutrino data will require a complete description of the matter effect in the six channel space.

Stephenson, G. J. Jr. [Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States); Goldman, T. [Theoretical Division, MS-B283, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); McKellar, B. H. J. [University of Melbourne Parkville, Victoria 3052 (Australia)

2006-07-11

258

Rapid Acquisition for Direct Sequence Spread-Spectrum Communications Using Parallel SAW Convolvers  

Microsoft Academic Search

In this paper, a technique is described which uses multiple surface acoustic wave (SAW) devices in parallel to reduce the acquisition time of a direct sequence spread-spectrum communication system. Analysis of system performance in both the search and lock modes is presented, and key quantities such as probability of false alarm, probability of correct detection, mean dwell time, and mean

L. B. Milstein; J. Gevargiz; P. K. Das

1985-01-01

259

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

260

Improving BPH symptoms and sexual dysfunctions with a saw palmetto preparation? Results from a pilot trial.  

PubMed

In elderly men, benign prostatic hyperplasia (BPH) is a major risk factor for sexual dysfunctions (SDys). Additionally, the standard treatments for BPH symptoms, alpha blockers and 5-alpha-reductase inhibitors, cause SDys themselves. Preparations from saw palmetto berries are an efficacious and well-tolerated symptomatic treatment for mild to moderate BPH and have traditionally been used to treat SDys. We conducted an open multicentric clinical pilot trial to investigate whether the saw palmetto berry preparation Prostasan® influenced BPH symptoms and SDys. Eighty-two patients participated in the 8-week trial, taking one capsule of 320?mg saw palmetto extract daily. At the end of the treatment, the International Prostate Symptom Score was reduced from 14.4?±?4.7 to 6.9?±?5.2 (p?saw palmetto to show improvement in BPH symptoms and SDys as well. [Corrections made here after initial online publication.] PMID:22522969

Suter, Andreas; Saller, Reinhard; Riedi, Eugen; Heinrich, Michael

2013-02-01

261

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

262

Monochromatic neutrinos generated by dark matter and the see-saw mechanism  

E-print Network

We study a minimal extension of the Standard Model where a scalar field is coupled to the right handed neutrino responsible for the see-saw mechanism for neutrino masses. In the absence of other couplings, the scalar $A$ has a unique decay mode $A \\rightarrow \

Dudas, Emilian; Olive, Keith

2014-01-01

263

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

264

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

265

Observing the motion of seed coat fragments on a saw-type lint cleaner  

Technology Transfer Automated Retrieval System (TEKTRAN)

A study was conducted to observe how seed coat fragments (in ginned lint) reacted after colliding with grid bars mounted on a full-size saw-type lint cleaner. A high-speed video camera recorded the collision. A 45° and 105° grid bar were used in the study. The grid bars were labeled to describe t...

266

Seed Germination Methods and Establishment of Saw-Palmetto, Serenoa Repens, in South Texas  

Technology Transfer Automated Retrieval System (TEKTRAN)

Saw-pametto, Serenoa repens, a native of Florida rangelands, and used medicinally in prostate formulations, was evaluated as an alternative crop for South Texas (USA). Fresh seeds, obtained from the USDA Plant Introduction Station, Miami, Florida on Oct.28, 1999, were sown directly into artificial ...

267

Celebrating the centennial (1894-1994): Leonardo Gigli and his wire saw.  

PubMed

In spite of the recent introduction of craniotomes in neurosurgical practice, the simple but brilliant wire saw invented by Leonardo Gigli still holds an important place in neurosurgical instrumentation. Born in Florence in 1863, Gigli was forced by circumstances to leave Italy soon after getting his medical degree. He first spent 2 years attending the most celebrated obstetrical clinics in Paris and London and then, in 1892, moved to Breslau where he worked with Fritsch and Mikulicz. During this successful and rewarding period, Gigli proposed the lateralized pubiotomy (Gigli's operation) for safe delivery in cases of maternal pelvic deformities and, inspired by the sight of a jagged knife during a country banquet, conceived his wire saw to simplify the procedure. In 1894, at Professor Obalinski's suggestion, he successfully tested a modified saw type with a whalebone guide for the preparation of osteoplastic cranial flaps. In spite of his great popularity and the high esteem in which he was held abroad, Gigli's aims were systematically belittled in Italy, where he never qualified for a university teaching position. He died in 1908, at age 44. Although the once celebrated Gigli's operation has merely historical interest today, the favorable features of his wire saw make it a safe and efficient tool in the hands of twentieth-century neurosurgeons worldwide. PMID:7760186

Brunori, A; Bruni, P; Greco, R; Giuffré, R; Chiappetta, F

1995-06-01

268

VALIDATION OF THE PROPAGATION SAW TEST NEAR WHUMPFS AND AVALANCHES Dave Gauthier*1  

E-print Network

VALIDATION OF THE PROPAGATION SAW TEST NEAR WHUMPFS AND AVALANCHES Dave Gauthier*1 , Cameron Ross2 to an extent that would lead to avalanche release. We review a recent PST validation study in which fracture present new PST results from 17 whumpf and avalanche sites in the Columbia Mountains of British Columbia

Jamieson, Bruce

269

DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BASED ON SAW RESONATORS  

E-print Network

, discrete Hartley Transform (DHT) and the method of fast searching center frequency of sensors by comparison387 DESIGN OF TEMPERATURE SENSOR ARRAY IN SMART ELECTRIC GRID BASED ON SAW RESONATORS Yu-lin HAN1 * Corresponding author, E-mail: than@sjtu.edu.cn; Tel.: 86-021-34204761. The sensor array with six sensors working

Wang, Ji

270

P1K-3 Contactless Torque and Temperature Sensor Based on SAW Resonators  

Microsoft Academic Search

A wireless passive SAW sensor based on three one-port resonators and capable of simultaneous torque and temperature measurement is presented. The sensing element is made on Y+34deg cut quartz substrate and the resonant frequencies are in the range from 433 to 437 MHz. Interrogation of the sensor is performed through an RF rotary coupler by short RF pulses. A microprocessor

Victor Kalinin; George Bown; Arthur Leigh

2006-01-01

271

SAW ethanol gas sensors based on cryptophane-A sensitive film  

Microsoft Academic Search

Surface acoustic wave (SAW) devices have been widely used for various chemical sensing applications because the sensor signal can be detected by simple and inexpensive electronics. The interactions between target analyte and the sensor surface cause changes in the mechanical, electrical, dielectric properties of the sensing coating deposited onto acoustic transducer. The changes in these properties will lead to changes

Ping Sun; Yadong Jiang; Guangzhong Xie; Xiaosong Du

2010-01-01

272

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

273

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

E-print Network

Nobel prize winners saluted Last month saw UEA celebrating the award of the Nobel Peace Prize to Al institution globally. The news came a day after the announcement of the award of the Nobel Prize with this year's Nobel laureates spanning two of its main areas of expertise ­ literature and climate science

Feigon, Brooke

274

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.2 Ã?. The experimental atom manipulation signals reveal remark- ably detailed atom movement behaviors on an atom-by-atom basis. Manipulation with a scanning tunneling microscope STM tip allows engineer- ing

Hla, Saw-Wai

275

“Buzz-saw” noise: Prediction of the rotor-alone pressure field  

NASA Astrophysics Data System (ADS)

Public expectations of lower environmental noise levels, and increasingly stringent legislative limits on aircraft noise, result in noise being a critical technical issue in the development of jet engines. Noise at take-off, when the engines are at high-power operating conditions, is a key reference level for engine noise certification. "Buzz-saw" noise is the dominant fan tone noise from modern high-bypass-ratio turbofan aircraft engines during take-off. Rotor-alone tones are the key component of buzz-saw noise. The rotor-alone pressure field is cut-off at subsonic fan tip speeds; buzz-saw noise is associated with supersonic fan tip speeds, or equivalently, high power engine operating conditions. A recent series of papers has described new work concerning the prediction of buzz-saw noise. The prediction method is based on modelling the nonlinear propagation of one-dimensional sawtooth waveforms. A sawtooth waveform is a simplified representation of the rotor-alone pressure field. Previous validation of the prediction method focussed entirely on reproducing the spectral characteristics of buzz-saw noise; this was dictated at that time by the availability of spectral data only for comparison between measurement and prediction. In this paper, full validation of the method by comparing measurement and prediction of the rotor-alone pressure field is published for the first time. It is shown that results from the modelling based on a one-dimensional sawtooth waveform capture the essential features of the rotor-alone pressure field as it propagates upstream inside a hard-walled inlet duct. This verifies that predictions of the buzz-saw noise spectrum, which are in good agreement with the measured data, are based on a model which reproduces the key physics of the noise generation process. Validation results for the rotor-alone pressure field in an acoustically lined inlet duct are also shown. Comparisons of the measured and predicted rotor-alone pressure field are more difficult to interpret because the acoustic lining significantly modifies the sawtooth waveform, but there remains good agreement with the measured spectral data. The buzz-saw noise prediction code used to generate the simulations in this paper has been used by the Rolls-Royce Noise Department since 2004.

McAlpine, A.; Schwaller, P. J. G.; Fisher, M. J.; Tester, B. J.

2012-10-01

276

Simulation and evaluation of a bone sawing procedure for orthognathic surgery based on an experimental force model.  

PubMed

Bone sawing is widely used in orthognathic surgery to correct maxillary deformities. Successful execution of bone sawing requires a high level of dexterity and experience. A virtual reality (VR) surgical simulator can provide a safe, cost-effective, and repeatable training method. In this study, we developed a VR training simulator with haptic functions to simulate bone-sawing force, which was generated by the experimental force model. Ten human skulls were obtained in this study for the determination of surgical bone-sawing force. Using a 5-DOF machining center and a micro-reciprocating saw, bone specimens with different bone density were sawed at different feed rates (20, 40, and 60?mm/min) and spindle speeds (9800, 11,200 and 12,600 cycles per minute). The sawing forces were recorded with a piezoelectric dynamometer and a signal acquisition system. Linear correlation analysis of all experimental data indicates that there were significant positive linear correlations between bone-sawing force and bone density and tool feed rate and a moderate negative linear correlation with tool spindle rate. By performing multiple regression analysis, the prediction models for the bone-sawing procedure were determined. By employing Omega.6 as a haptic device, a medical simulator for the Lefort I osteotomy was developed based on an experimental force model. Comparison of the force-time curve acquired through experiments and the curve computed from the simulator indicate that the obtained forces based on the experimental force model and the acquired data had the same trend for the bone-sawing procedure of orthognathic surgery. PMID:24292329

Yanping, Lin; Dedong, Yu; Xiaojun, Chen; Xudong, Wang; Guofang, Shen; Chengtao, Wang

2014-03-01

277

Large and Almost Maximal Neutrino Mixing within the Type II See-Saw Mechanism  

E-print Network

Within the type II see-saw mechanism the light neutrino mass matrix is given by a sum of a direct (or triplet) mass term and the conventional (type I) see-saw term. Both versions of the see-saw mechanism explain naturally small neutrino masses, but the type II scenario offers interesting additional possibilities to explain large or almost maximal or vanishing mixings which are discussed in this paper. We first introduce ``type II enhancement'' of neutrino mixing, where moderate cancellations between the two terms can lead to large neutrino mixing even if all individual mass matrices and terms generate small mixing. However, nearly maximal or vanishing mixings are not naturally explained in this way, unless there is a certain initial structure (symmetry) which enforces certain elements of the matrices to be identical or related in a special way. We therefore assume that the leading structure of the neutrino mass matrix is the triplet term and corresponds to zero U_{e3} and maximal theta_{23}. Small but necessary corrections are generated by the conventional see-saw term. Then we assume that one of the two terms corresponds to an extreme mixing scenario, such as bimaximal or tri-bimaximal mixing. Deviations from this scheme are introduced by the second term. One can mimic Quark-Lepton Complementarity in this way. Finally, we note that the neutrino mass matrix for tri-bimaximal mixing can be -- depending on the mass hierarchy -- written as a sum of two terms with simple structure. Their origin could be the two terms of type II see-saw.

Manfred Lindner; Werner Rodejohann

2007-03-16

278

Determination and experimental verification of high-temperature SAW orientations on langatate.  

PubMed

Langatate (LGT) is a member of the langasite family of crystals appropriate for high-temperature frequency control and sensing applications. This paper identifies multiple LGT SAW orientations for use at high temperature, specifically in the 400°C to 900°C range. Orientations with low sensitivity to temperature are desired for frequency control devices and many sensors, conversely large temperature sensitivity is a benefit for temperature sensors. The LGT SAW temperature behavior has been calculated for orientations sweeping the Euler angles (0°, ?, ?), (90°, ?, ?), and (?, 90°, ?), based on newly identified high-temperature elastic constants and temperature coefficients for this material. The temperature coefficient of delay (TCD) and total frequency change over the temperature range were analyzed from 400°C to 900°C. Multiple SAW orientations were identified with zero-TCD between 400°C and 500°C. Although no orientations that have turn-over temperatures above 500°C were identified, several have low frequency variation with temperature, of the order of -0.8% over the range 400°C to 800°C. Temperature-sensitive orientations with TCD up to 75 ppm/°C at 900°C were identified, with potential for high-temperature sensor applications. The reported predictions are shown to agree with measured behavior of LGT SAW delay lines fabricated along 6 orientations in the (90°, 23°, ?) plane. In addition, this work demonstrates that concurrently operated LGT SAW devices fabricated on the same wafer provide means of temperature sensing. In particular, the measured frequency difference between delay lines oriented along (90°, 23°, 0°) and (90°, 23°, 48°) has fractional temperature sensitivity that ranges from -172 ppm/°C at 25°C to -205 ppm/°C at 900°C. PMID:24626037

Davulis, Peter M; da Cunha, Mauricio Pereira

2012-02-01

279

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

was significantly different. Saw-whet owl prey biomass fell mainly between 11 and 55 grams; screech-owl prey biomass was more evenly distributed across the weight classes (0.5 grams - 400 grams). Northern Saw-whet Owls

280

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

281

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

282

Precision SAW filters for a large phased-array radar system  

NASA Astrophysics Data System (ADS)

The electronically steerable radar (ELRA) at the Forschungsinstitut fuer Funk und Mathematik is an experimental S-band phased-array radar system consisting of separate transmitting and receiving arrays employing several coherent and incoherent signal-processing and data-handling techniques, incorporating multiple beam and multifunction operation for target search and tracking, adaptive interference suppression, and target resolution. This paper deals with the development and application of two types of SAW filters for the IF amplifier channel of the receiving array. Compared to conventional filters with lumped elements, these filters have some important merits. By making use of a special tuning technique, the center frequencies of all filters were adjusted, resulting in an rms deviation of less than 1 kHz. One type of the SAW filters represents an almost ideal approach of realizing a matched filter for rectangular shaped pulses. The conformity of the frequency responses of several hundred filters improved the noise suppression capability of the system.

Haydl, W. H.; Sander, W.; Wirth, W.-D.

1981-05-01

283

Predictions from type II see-saw mechanism in SU(5)  

E-print Network

We propose a simple, testable, SU(5) model within the context of the type II neutrino see-saw mechanism. It is based on requiring renormalizability, the absence of any other matter fields besides those already present in the Standard Model and consistency with all experimental data. These "minimal" requirements, together with group-theoretical considerations, uniquely determine the model and lead to interesting implications. The model predicts correlation between a light SU(2) triplet boson responsible for the type II see-saw mechanism and observable proton decay signatures. It also allows for an enhanced production of doubly charged Higgs particles through the WW fusion process due to a built-in custodial symmetry. This could also have profound impact on the explicit realization of electroweak symmetry breaking. The model also predicts the existence of a light scalar that transforms as a colour octet and electroweak doublet, with interesting phenomenological consequences.

Ilja Dorsner; Irina Mocioiu

2007-08-24

284

Lightest Higgs Boson Mass in Split Supersymmetry with See-saw Mechanism  

E-print Network

In the minimal supersymmetric standard model extended by including right-handed neutrinos with see-saw mechanism, the neutrino Yukaka couplings can be as large as the top-quark Yukawa couplings and thus the neutrino/sneutrino may cause sizable effects in Higgs boson self-energy loops. Our explicit one-loop calculations show that the neutrino/sneutrino effects may have an opposite sign to top/stop effects and thus lighten the lightest Higgs boson. If the soft-breaking mass of the right-handed neutrino is very large (at the order of Majorana mass scale), such as in the split-SUSY scenario, the effects can lower the lightest Higgs boson mass by a few tens of GeV. So the Higgs mass bound of about 150 GeV in split-SUSY may be lowered significantly if right-handed neutrinos come into play with see-saw mechanism.

Junjie Cao; Jin Min Yang

2004-12-21

285

Higgs Decays in the Low Scale Type I See-Saw Model  

E-print Network

The couplings of the low scale type I see-saw model are severely constrained by the requirement of reproducing the correct neutrino mass and mixing parameters, by the non-observation of lepton number and charged lepton flavour violating processes and by electroweak precision data. We show that all these constraints still allow for the possibility of an exotic Higgs decay channel into a light neutrino and a heavy neutrino with a sizable branching ratio. We also estimate the prospects to observe this decay at the LHC and discuss its complementarity to the indirect probes of the low scale type I see-saw model from experiments searching for the $\\mu\\to e\\gamma$ decay.

C. Garcia Cely; A. Ibarra; E. Molinaro; S. T. Petcov

2012-08-17

286

See-Saw Realization of the Texture Zeros in the Neutrino Mass Matrix  

E-print Network

We study the see-saw realization of seven textures of the neutrino mass matrix, which were presented by Frampton, Glashow and Marfatia. Two of them B_1 and B_2 are not realized in the see-saw mechanism without fine-tuning of parameters. We present some specific textures of the Dirac neutrino mass matrix and the right-handed Majorana neutrino one. In order to test these textures, we discuss the effect on the branching ratio of mu --> e gamma. We also study the U(1)_X times U(1)_{X'} flavor symmetry, in which U(1)_X is anomalous and U(1)_{X'} is non-anomolous, to reproduce texture zeros. We present examples of U(1) charges for two textures A_1 and A_2$.

A. Kageyama; S. Kaneko; N. Shimoyama; M. Tanimoto

2002-04-25

287

Scaling in the Neutrino Mass Matrix, mu-tau Symmetry and the See-Saw Mechanism  

E-print Network

The scaling hypothesis postulates proportionality of two columns of the Majorana neutrino mass matrix in the flavor basis. This Ansatz was shown to lead to an inverted hierarchy and U_{e3} = 0. We discuss theoretical and phenomenological properties of this hypothesis. We show that (i) the neutrino mass matrix with scaling follows as a consequence of a generalized mu-tau symmetry imposed on the type-I see-saw model; (ii) there exists a unique texture for the Dirac mass matrix m_D which leads to scaling for arbitrary Majorana matrix M_R in the context of the type-I see-saw mechanism; (iii) unlike in the mu-tau symmetric case, a simple model with two right-handed neutrinos and scaling can lead to successful leptogenesis both with and without the inclusion of flavor effects.

Anjan S. Joshipura; Werner Rodejohann

2009-05-13

288

The Frobenius group T13 and the canonical see-saw mechanism applied to neutrino mixing  

E-print Network

The compatibility of the Frobenius group T13 with the canonical see-saw mechanism of neutrino mixing is examined. The Standard Model is extended in a minimalist way, by introducing a family symmetry and three right-handed neutrinos. To fit experiments and place constraints on the possibilities, tribimaximal mixing is used as a guideline. The application of both a family symmetry group and the canonical see-saw mechanism naturally generates small neutrino masses. The various possibilities from combining these two models are listed. Enough constraints are produced to narrow down the parameters of the neutrino mass matrix to two. This is therefore a predictive model where neutrino mass eigenvalues and allowed regions for neutrinoless double beta decay are suggested.

Christine Hartmann

2011-09-23

289

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

290

A differential-delay SAW correlator for combined DSSS despreading and DPSK demodulation  

Microsoft Academic Search

The design of a novel SAW (surface-acoustic-wave) component for the noncoherent detection of DS\\/SS (direct-sequence spread-spectrum) signals with a DPSK (differential phase-shift keying) modulation format is presented. In the considered differential-delay correlator, both the correlation function for despreading and the delay function for DPSK demodulation are merged into a single device. Due to the absence of a separate delay line,

J. C. Haartsen

1993-01-01

291

An application of SAW convolvers to high bandwidth spread spectrum communications  

Microsoft Academic Search

A spread spectrum communications subsystem that is based on the separated medium acoustoelectric convolver is described. The subsystem generates minimum-shift-keyed (MSK) waveforms with the aid of SAW filters and performs differential-phase-shift-keyed (DPSK) data demodulation with acoustoelectric convolvers. The convolver provides a BT product of 2200 with a 3-dB bandwidth of 100 MHz. The signals processed by the subsystem have a

J. H. Goll; D. C. Malocha

1981-01-01

292

Some Fundamental Limits on SAW RFID Tag Information Capacity and Collision Resolution  

NASA Technical Reports Server (NTRS)

In this paper, we apply results from multi-user information theory to study the limits of information capacity and collision resolution for SAW RFID tags. In particular, we derive bounds on the achievable data rate per tag as a function of fundamental parameters such as tag time-bandwidth product, tag signal-to-noise ratio (SNR), and number of tags in the environment. We also discuss the implications of these bounds for tag waveform design and tag interrogation efficiency

Barton, Richard J.

2013-01-01

293

A General Analysis of Corrections to the Standard See-saw Formula in Grand Unified Models  

E-print Network

In realistic grand unified models there are typically extra vectorlike matter multiplets at the GUT scale that are needed to explain the family hierarchy. These contain neutrinos that, when integrated out, can modify the usual neutrino see-saw formula. A general analysis is given. It is noted that such modifications can explain why the neutrinos do not exhibit a strong family hierarchy like the other types of fermions.

S. M. Barr; Bumseok Kyae

2004-07-13

294

Neutrino masses through see-saw mechanism in 3-3-1 models  

E-print Network

Some years ago it was shown by Ma that in the context of the electroweak standard model there are, at the tree level, only three ways to generate small neutrino masses by the see-saw mechanism via one effective dimension-five operator. Here we extend this approach to 3-3-1 chiral models showing that in this case there are several dimension-five operators and we also consider their tree level realization.

J. C. Montero; C. A. de S. Pires; V. Pleitez

2001-12-18

295

The Natural Single-Phase Unidirectional Transducer: A New Low-Loss SAW Transducer  

Microsoft Academic Search

This paper describes a completely new design approach for low-loss SAW transducers and components. This new approach utilizes special unconventional asymmetric crystal orientations. On these new orientations, which exist on conventional piezoelectric cryslals, simple single-level uniform twoelectrodes-per-wavelength transducers can exhibit a unidirectional response. In contrast to low-loss three-phase transducers, air-gap crossovers are not required and all electrode and gap widths

P. V. Wright

1985-01-01

296

Neutrino Oscillations, SUSY See-Saw Mechanism and Charged Lepton Flavor Violation  

E-print Network

Neutrino oscillations give clear evidence for non-vanishing neutrino masses and lepton-flavor violation (LFV) in the neutrino sector. This provides strong motivation to search for signals of LFV also in the charged lepton sector, and to probe the SUSY see-saw mechanism. We compare the sensitivity of rare radiative decays on the right-handed Majorana mass scale M_R with the reach in slepton-pair production at a future linear collider.

F. Deppisch; H. Päs; A. Redelbach; R. Rückl; Y. Shimizu

2002-11-11

297

Understanding the linear see-saw neutrino mass relations and large mixing angle MSW solution  

E-print Network

We study the effective ways for generating the linear see-saw neutrino mass relations and large neutrino mixing angles in two classes of grand unified SO(10) models where the texture of Dirac neutrino mass matrix is related to either the charged lepton mass matrix (case A) or the up-quark mass matrix (case B). We also briefly analyse their stability criteria and they are found to be stable under under radiative corrections at low energies.

N. Nimai Singh

2000-09-07

298

SAW propagation characteristics and fabrication technology of piezoelectric thin film\\/diamond structure  

Microsoft Academic Search

The authors report a theoretical analysis of the surface-acoustic wave (SAW) propagation characteristics of ZnO\\/diamond and AlN\\/diamond structures. The analysis shows about 12000 m\\/s and a large electromechanical coupling coefficient K2 of 0.03 for AlN thin film. The numerical analysis for the ZnO\\/diamond structure shows that there exists a coupling between the Rayleigh wave and the Sezawa wave at H\\/?=0.2

K. Yamanouchi; N. Sakurai; T. Satoh

1989-01-01

299

Film-loaded SAW waveguides for integrated acousto-optical polarization converters  

Microsoft Academic Search

We report on a detailed theoretical and experimental investigation of film-loaded surface acoustic wave (SAW) waveguides in lithium niobate (LiNbO3) for integrated acousto-optical (AO) polarization converters. The numerical analysis is based on both a scalar and a full-vectorial model. Dispersion plots and figures of merit for several structures are given, which lead to design parameters for optimized polarization converters. It

Oscar A. Peverini; Harald Herrmann; Renato Orta

2004-01-01

300

A 5.84 GHz tunable SAW oscillator with frequency doubler for a DSRC system  

Microsoft Academic Search

A varactor tuned oscillator with an external SAW resonator and integrated frequency doubler is developed on a low cost 0.8 ?m SiGe BiCMOS technology for a DSRC application. The measured phase noise is -95.5 dBc\\/Hz at 10 kHz offset on a single-ended 50 ? load. A PMOS accumulation-mode varactor is used for the fine tuning of the oscillation frequency within

Jan Steinkamp; Frank Henkel; Uwe Stehr; Cornelia Eube; Peter Waldow; Hisanori Uda; Hiroaki Hayashi; Ryu Kimura; Kazuo Mizuno

2003-01-01

301

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

PubMed Central

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 injuries due to electric circular saws. Methods Patients treated from 1999 through 2007 for circular saw-related hand injuries were contacted and asked for clinical follow-up assessment. The clinical follow-up protocol consisted of a physical examination and an assessment of static muscle power (grip and pinch strength). For assessment of the subjective experience of the patients regarding their injury-related disability and impairment, the DASH follow-up questionnaire was used. The occupational impact of these injuries was measured by number of lost working days. Finally, safety-related behaviour of the patients was investigated. Results 114 Patients were followed-up on average 52 months after the injury. Average in-house treatment was 8.8 days. Average time lost from work was 14.8 weeks. A significant reduction of static muscle testing parameters compared with the uninjured hand was revealed for grip strength, tip pinch, key pinch, and palmar pinch. Average DASH score was 17.4 (DASH work 15.8, DASH sports/music 17.7). Most patients had more than ten years experience in using these power tools. Conclusion The everyday occurrence of circular saw-related hand injuries followed by relatively short periods of in-house treatment might distort the real dimension of the patients' remaining disability and impairment. While the trauma surgeon's view is generally confined to the patients' clinical course, the outcome parameters in this follow-up investigation, with loss of working time as the key factor, confirm that the whole socioeconomic burden is much greater than the direct cost of treatment. PMID:20819215

2010-01-01

302

A SAW-based group demodulator for onboard processing in communications satellites  

Microsoft Academic Search

An experimental 24-channel multicarrier (64-kb\\/s bit rate for each carrier) group demodulator using surface acoustic wave (SAW) chirp Fourier transform (CFT) processing is described. The demodulated data are combined into a single time division multiplexing (TDM) bit stream at the standard T1 rate of 1.544 Mb\\/s. Measured data on this M unit demonstrate superior performance (40-dB sidelobe suppression, 0.34-dB combined

Michael D. Shaw; Chun Loo; E. C. W. Wong

1991-01-01

303

Phase stability comparison of SAW sensor evaluation with various CW type radars  

Microsoft Academic Search

The paper describes the comparison of three different types of continuous wave (CW) radars to interrogate surface acoustic wave (SAW) sensors. The CW types are as follows: a frequency modulated (FMCW), a frequency stepped (FSCW) and a switched frequency stepped (S-FSCW) radar. All types operate in the 2.4 GHz ISM band with a bandwidth of approximately 80 MHz. Whereas the sweep time

Alfred Binder; René Fachberger; Martin Lenzhofer

2010-01-01

304

Ladder-type SAW filters using thinned density of randomly distributed "hot" electrodes.  

PubMed

A new method for the design of relatively narrowband ladder-type SAW filters is proposed. It consists of the thinning procedure and consecutive randomization of positions of the remaining transductive periods inside the IDT to suppress undesirable additional passbands. A 0.9% fractional bandwidth filter on LiTaO(3) 42°-cut was designed and manufactured using the proposed approach. PMID:21041145

Kim, Che-Uk; Balashov, Sergey M; Plessky, Victor P; Nam, Chang-Woo; Lee, Kyu-Chul

2010-11-01

305

Rounded cutting edge model for the prediction of bone sawing forces.  

PubMed

A new analytical model to predict bone sawing forces is presented. Development of the model was based on the concept of a single tooth sawing at a depth of cut less than the cutting edge radius. A variable friction model was incorporated as well as elastic Hertzian contact stress to determine a lower bound for the integration limits. A new high speed linear apparatus was developed to simulate cutting edge speeds encountered with sagittal and reciprocating bone saws. Orthogonal cutting experiments in bovine cortical bone were conducted for comparison to the model. A design of the experiment's approach was utilized with linear cutting speeds between 2600 and 6200 mm/s for depths of cut between 2.5 and 10 ?m. Resultant forces from the design of experiments were in the range of 8 to 11 N, with higher forces at greater depths of cut. Model predictions for resultant force magnitude were generally within one standard deviation of the measured force. However, the model consistently predicted a thrust to cutting force ratio that was greater than measured. Consequently, resultant force angles predicted by the model were generally 20 deg higher than calculated from experimental thrust and cutting force measurements. PMID:24763623

James, Thomas P; Pearlman, John J; Saigal, Anil

2012-07-01

306

Study of low insertion loss and miniaturization wavelet transform and inverse transform processor using SAW devices.  

PubMed

In this paper, we propose a low insertion loss and miniaturization wavelet transform and inverse transform processor using surface acoustic wave (SAW) devices. The new SAW wavelet transform devices (WTDs) use the structure with two electrode-widths-controlled (EWC) single phase unidirectional transducers (SPUDT-SPUDT). This structure consists of the input withdrawal weighting interdigital transducer (IDT) and the output overlap weighting IDT. Three experimental devices for different scales 2(-1), 2(-2), and 2(-3) are designed and measured. The minimum insertion loss of the three devices reaches 5.49dB, 4.81dB, and 5.38dB respectively which are lower than the early results. Both the electrode width and the number of electrode pairs are reduced, thus making the three devices much smaller than the early devices. Therefore, the method described in this paper is suitable for implementing an arbitrary multi-scale low insertion loss and miniaturization wavelet transform and inverse transform processor using SAW devices. PMID:23399004

Jiang, Hua; Lu, Wenke; Zhang, Guoan

2013-07-01

307

See-Saw Induced CMSSM Lepton-Flavour Violation Post-WMAP  

E-print Network

The see-saw mechanism of neutrino mass generation, when incorporated in supersymmetric theories with supergravity mediated supersymmetry breaking, results in low-energy lepton-flavour violation arising from the soft supersymmetry breaking slepton masses. The parameter space of supergravity theories with conserved R-parity is severely constrained by the requirement that the LSP provide cold dark matter with a relic density in the range indicated by the recent WMAP measurements, as well as by laboratory constraints. We calculate the $\\meg$ branching ratio for the constrained minimal supersymmetric standard model, over the range of parameters consistent with WMAP and laboratory constraints, in families of see-saw model parameterizations which fit the low energy neutrino measurements. We find that over much of the range of see-saw models, for supersymmetry parameters consistent with WMAP and laboratory bounds, the resulting predicted rates for $\\meg$ (and other charged lepton flavour violating processes) are within current experimental limits, but that these rates should be detectable with the next generation of lepton-flavour violation experiments.

Bruce A. Campbell; David W. Maybury; Brandon Murakami

2003-11-19

308

Evaluation of Relative Sensitivity of SAW and Flexural Plate Wave Devices for Atmospheric Sensing  

NASA Technical Reports Server (NTRS)

The objective of this project is to evaluate the suitability of the ultrasonic flexural plate wave (FPW) device as the detector in a gas chromatograph (GC). Of particular interest is the detection of nitrous oxide (N2O). From experimental results we conclude analyte detection is achieved through two mechanisms: changes in gas density, and mass loading of the device membrane due to the sorption of gas molecules. Reducing the dead volume of the FPW chamber increased the FPW response. A comparison of the FPW response to that of the surface acoustic wave (SAW) detector provided with the GC (made by MSI, Microsensor Technologies, Inc.), shows that for unseparated N2O in N2, the FPW exhibits a sensitivity that is at least 550 times greater than that of the SAW device. A Porapak Q column was found to separate N2O from its carrier gas, N2 or He. With the Porapak Q column, a coated FPW detected 1 ppm N2O in N2 or He, with a response magnitude of 7 Hz. A coated SAW exhibited a response of 25 Hz to pure N2O. The minimal detectable N2O concentrations of the sensors were not evaluated.

White, Richard M.; Black, Justin; Chen, Bryan

1998-01-01

309

Homologous recombination induced by doxazosin mesylate and saw palmetto in the Drosophila wing-spot test.  

PubMed

Benign prostatic hyperplasia (BPH) is the most common tumor in men over 40 years of age. Acute urinary retention (AUR) is regarded as the most serious hazard of untreated BPH. ?-Blockers, such as doxazosin mesylate, and 5-? reductase inhibitors, such as finasteride, are frequently used because they decrease both AUR and the need for BPH-related surgery. An extract of the fruit from American saw palmetto plant has also been used as an alternative treatment for BPH. The paucity of information available concerning the genotoxic action of these compounds led us to assess their activity as inducers of different types of DNA lesions using the somatic mutation and recombination test in Drosophila melanogaster. Finasteride did not induce gene mutation, chromosomal mutation or mitotic recombination, which means it was nongenotoxic in our experimental conditions. On the other hand, doxazosin mesylate and saw palmetto induced significant increases in spot frequencies in trans-heterozygous flies. In order to establish the actual role played by mitotic recombination and by mutation in the genotoxicity observed, the balancer-heterozygous flies were also analyzed, showing no increment in the total spot frequencies in relation to the negative control, for both drugs. Doxazosin mesylate and saw palmetto were classified as specific inducers of homologous recombination in Drosophila proliferative cells, an event linked to the loss of heterozygosity. PMID:22015851

Gabriel, Katiane Cella; Dihl, Rafael Rodrigues; Lehmann, Mauricio; Reguly, Maria Luiza; Richter, Marc François; Andrade, Heloisa Helena Rodrigues de

2013-03-01

310

Measurement and FEM/BEM simulation of transverse effects in SAW resonators on lithium tantalate.  

PubMed

It is well known that transverse effects contribute significantly to the loss of SAW resonators on lithium tantalate. In particular, for frequencies above resonance, the surface wave is not guided inside the transducer and radiates into the busbars. In addition, because bulk modes can also be excited, scalar models are not sufficient to accurately predict transverse effects. It is also known that the layout of a SAW resonator (electrode gaps and dummy electrodes) has a strong impact on the transverse effects. In this paper, a periodic FEM/BEM model is presented and is used to simulate the transverse effects for various SAW resonator layouts. Test devices matching those simulated are fabricated and measured; the measured results are compared with the simulated results and show good agreement. By analyzing the dispersion curves produced from the FEM/BEM model in the different regions of the device, several frequency bands corresponding to different transverse behaviors are identified. These results are consistent with the elastic displacements, also computed by the FEM/BEM model. It is further shown that guided conditions in the gap between the transducer and the busbar occur for a frequency range above resonance. This result is in agreement with measurements showing that resonators with smaller gaps exhibit smaller spurious responses in their admittance. PMID:24158295

Solal, Marc; Chen, Li; Gratier, Julien

2013-11-01

311

.~ Saw-Tooth Lag Smoother with an Application to FM Demodulation. Laurence Irlicht,Vi Krishnanmrthy, J.B. Moore *  

E-print Network

.~ Saw-Tooth Lag Smoother with an Application to FM Demodulation. Laurence Irlicht,Vi Krishnanmrthy filter context, namely FM demodulation. The algorithm provides perfor- mance comparable to a fixed lag

Moore, John Barratt

312

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

313

Deep-UV sensors based on SAW oscillators using low-temperature-grown AlN films on sapphires.  

PubMed

High-quality epitaxial AlN films were deposited on sapphire substrates at low growth temperature using a helicon sputtering system. SAW filters fabricated on the AlN films exhibited excellent characteristics, with center frequency of 354.2 MHz, which corresponds to a phase velocity of 5667 m/s. An oscillator fabricated using AlN-based SAW devices is presented and applied to deep-UV light detection. A frequency downshift of about 43 KHz was observed when the surface of SAW device was illuminated by a UV source with dominant wavelength of around 200 nm. The results indicate the feasibility of developing remote sensors for deep-UV measurement using AlN-based SAW oscillators. PMID:21859589

Laksana, Chipta; Chen, Meei-Ru; Liang, Yen; Tzou, An-Jyeg; Kao, Hui-Ling; Jeng, Erik; Chen, Jyh; Chen, Hou-Guang; Jian, Sheng-Rui

2011-08-01

314

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

NASA Technical Reports Server (NTRS)

The Electromagnetic Systems Branch (EV4) of the Avionic Systems Division at NASA Johnson Space Center in Houston, TX is studying the utility of surface acoustic wave (SAW) radiofrequency identification (RFID) tags for multiple wireless applications including detection, identification, tracking, and remote sensing of objects on the lunar surface, monitoring of environmental test facilities, structural shape and health monitoring, and nondestructive test and evaluation of assets. For all of these applications, it is anticipated that the system utilized to interrogate the SAW RFID tags may need to operate at fairly long range and in the presence of considerable multipath and multiple-access interference. Towards that end, EV4 is developing a prototype SAW RFID wireless interrogation system for use in such environments called the Passive Adaptive RFID Sensor Equipment (PARSED) system. 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 this paper, we will consider the application of the PARSEQ system to the problem of simultaneous detection, identification, localization, and temperature estimation for multiple objects. We will summarize the overall design of the PARSEQ system and present a detailed description of the design and performance of the signal detection and estimation algorithms incorporated in the system. The system is currently configured only to measure temperature (jointly with range and tag ID), but future versions will be revised to measure parameters other than temperature as SAW tags capable of interfacing with external sensors become available. It is anticipated that the estimation of arbitrary parameters measured using SAW-based sensors will be based on techniques very similar to the joint range and temperature estimation techniques described in this paper.

Barton, Richard J.; Kennedy, Timothy F.; Williams, Robert M.; Fink, Patrick W.; Ngo, Phong H.

2009-01-01

315

High-energy x-ray optics with silicon saw-tooth refractive lenses.  

SciTech Connect

Silicon saw-tooth refractive lenses have been in successful use for vertical focusing and collimation of high-energy X-rays (50-100 keV) at the 1-ID undulator beamline of the Advanced Photon Source. In addition to presenting an effectively parabolic thickness profile, as required for aberration-free refractive optics, these devices allow high transmission and continuous tunability in photon energy and focal length. Furthermore, the use of a single-crystal material (i.e. Si) minimizes small-angle scattering background. The focusing performance of such saw-tooth lenses, used in conjunction with the 1-ID beamline's bent double-Laue monochromator, is presented for both short ({approx}1:0.02) and long ({approx}1:0.6) focal-length geometries, giving line-foci in the 2 {micro}m-25 {micro}m width range with 81 keV X-rays. In addition, a compound focusing scheme was tested whereby the radiation intercepted by a distant short-focal-length lens is increased by having it receive a collimated beam from a nearer (upstream) lens. The collimation capabilities of Si saw-tooth lenses are also exploited to deliver enhanced throughput of a subsequently placed small-angular-acceptance high-energy-resolution post-monochromator in the 50-80 keV range. The successful use of such lenses in all these configurations establishes an important detail, that the pre-monochromator, despite being comprised of vertically reflecting bent Laue geometry crystals, can be brilliance-preserving to a very high degree.

Shastri, S. D.; Almer, J. A.; Ribbing, C. R.; Cederstrom, B. C.; X-Ray Science Division; Uppsala Univ.; Royal Inst. of Tech.

2007-01-01

316

The Effect of Increasing Doses of Saw Palmetto Fruit Extract on Serum PSA Levels: Analysis of the CAMUS Randomized Trial  

PubMed Central

Purpose Saw palmetto extracts are used for treating lower urinary tract symptoms in men despite level I evidence concluding that saw palmetto was ineffective in reducing lower urinary symptoms. We sought to determine whether higher doses of saw palmetto as studied in CAMUS affect serum PSA levels. Materials and Methods The CAMUS trial was a randomized, placebo-controlled double blind multi-centered North American trial conducted between June 5, 2008 and October 10, 2012 in which 369 men >45 years of age with AUA symptom score ? 8 and ? 24 were randomly assigned to placebo or dose escalation saw palmetto, which consisted of 320mg for first 24 weeks to 640mg for next 24 weeks to 960mg for last 24 weeks of this 72 week trial. Serum PSA levels (Beckman-Coulter) were obtained at baseline and at weeks 24, 48 and 72 and were compared between treatment groups using the pooled t and Fisher's exact tests. Results Serum PSA levels were similar at baseline for the placebo (1.93 ± 1.59 ng/ml) and saw palmetto groups (2.20 ± 1.95, p = 0.16). Changes in PSA levels over the course of the study were similar: placebo group mean change 0.16 ± 1.08 ng/ml and saw palmetto group mean change 0.23 ± 0.83 ng/ml (p value 0.50). Additionally, no differential effect on serum PSA levels was observed between treatment arms when groups were stratified by baseline PSA values. Conclusions Saw palmetto extract does not affect serum PSA levels more than placebo even at relatively high doses. PMID:23253958

Andriole, Gerald L.; McCullum-Hill, Christie; Sandhu, Gurdarshan S.; Crawford, E. David; Barry, Michael J.; Cantor, Alan

2014-01-01

317

Linear Polymers in Disordered Media - the shortest, the longest and the mean(est) SAW on percolation clusters  

E-print Network

Long linear polymers in strongly disordered media are well described by self-avoiding walks (SAWs) on percolation clusters. The length-distribution of these SAWs encompasses to distinct averages, viz. the averages over cluster- and SAW-conformations. For the latter average, there are two basic options, one being static and one being kinetic. It is well known for static averaging that if the disorder of the underlying medium is weak, differences to the ordered case appear merely in non-universal quantities. Using dynamical field theory, we show that the same holds true for kinetic averaging. For strong disorder, i.e., the medium being close to the percolation point, we employ a field theory for the nonlinear random resistor network in conjunction with a real-world interpretation of Feynman diagrams, and we calculate the scaling exponents for the shortest, the longest and the mean or average SAW to 2-loop order. In addition, we calculate to 2-loop order the entire family of multifractal exponents that governs the moments of the the statistical weights of the elementary constituents (bonds or sites of the underlying fractal cluster) contributing to the SAWs. Our RG analysis reveals that kinetic averaging leads to renormalizability whereas static averaging does not, and hence, we argue that the latter does not lead to a well-defined scaling limit. We discuss the possible implications of this finding for experiments and numerical simulations which have produced wide-spread results for the exponent of the average SAW. To corroborate our results, we also study the well-known Meir-Harris model for SAWs on percolation clusters. We demonstrate that this model leads back to 2-loop order to the renormalizable real world formulation with kinetic averaging if the replica limit is consistently performed at the first possible instant of the calculation.

Hans-Karl Janssen; Olaf Stenull

2011-11-22

318

Double Higgs production at LHC, see-saw type II and Georgi-Machacek model  

E-print Network

The double Higgs production in the models with isospin-triplet scalars is studied. It is shown that in the see-saw type II model the mode with an intermediate heavy scalar, $pp\\to H+X\\to 2h+X$, may have the cross section which is compatible with that in the Standard Model. In the Georgi-Machacek model this cross section could be much larger than in SM since the vacuum expectation value of the triplet can be large.

S. I. Godunov; M. I. Vysotsky; E. V. Zhemchugov

2014-08-01

319

Double Higgs production at LHC, see-saw type II and Georgi-Machacek model  

E-print Network

The double Higgs production in the models with isospin-triplet scalars is studied. It is shown that in the see-saw type II model the mode with an intermediate heavy scalar, $pp\\to H+X\\to 2h+X$, may have the cross section which is compatible with that in the Standard Model. In the Georgi-Machacek model this cross section could be much larger than in SM since the vacuum expectation value of the triplet can be large.

Godunov, S I; Zhemchugov, E V

2014-01-01

320

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

321

An SO(10) GUT With See-Saw Masses For All Fermions  

E-print Network

We propose an SO(10) grand unified theory which has the simplest Higgs structure discussed so far in the literature. We include only two Higgs scalars, a 210-plet and a 16-plet. In addition to the regular fermions we include one singlet, whose mass term breaks chiral symmetry, so that fermions can get masses. All fermions acquire see-saw masses, since there are no Higgs bi-doublets. Required neutrino masses with large mixing as well as leptogenesis are possible in this model.

Bipin R. Desai; G. Rajasekaran; Utpal Sarkar

2004-11-07

322

Electrophobic Lorentz invariance violation for neutrinos and the see-saw mechanism  

E-print Network

In this talk we show how Lorentz invariance violation (LIV) can occur for Majorana neutrinos, without inducing LIV in the charged leptons via radiative corrections. Such ``electrophobic'' LIV is due to the Majorana nature of the LIV operator together with electric charge conservation. Being free from the strong constraints coming from the charged lepton sector, electrophobic LIV can in principle be as large as current neutrino experiments permit. On the other hand electrophobic LIV could be naturally small if it originates from LIV in some singlet ``right-handed neutrino'' sector, and is felt in the physical left-handed neutrinos via a see-saw mechanism.

S. F. King

2004-09-28

323

A Higgs--Saw Mechanism as a Source for Dark Energy  

E-print Network

Motivated by the see-saw mechanism for neutrinos which naturally generates small neutrino masses, we explore how a small GUT-scale mixing between the Standard Model Higgs and an otherwise massless hidden sector scalar can naturally generate a small mass and VEV for the new scalar which produces a false vacuum energy density contribution comparable to that of the observed dark energy dominating the current expansion of the Universe. The new scalar produces no discernible signatures in existing terrestrial experiments so that one may have to rely on other cosmological tests of this idea.

Lawrence M. Krauss; James B. Dent

2013-06-13

324

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 that is, they do not require any on-board power supply such as batteries 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. 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: What are the fundamental relationships between tag parameters such as bit-rate, time-bandwidth-product, SNR, and achievable collision resolution? What are the differences in optimal or near-optimal interrogator designs between noise-limited environments and interference-limited environments? 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 present the results of a research effort aimed at providing at least partial answers to all of these questions.

Barton, Richard J.

2011-01-01

325

A single closed-loop kinematic chain approach for a hybrid control of two cooperating arms with a passive joint: an application to sawing task  

Microsoft Academic Search

Deals with a sawing task performed by two cooperating arms. The two-arm system under our hand consists of a four degree-of-freedom (DOF) SCARA robot and a five DOF PT200V robot. When the two arms are rigidly grasping a saw, the mobility of the system is three, which is not enough for sawing tasks. Therefore, we deliberately insert a passive joint

Hee-Joo Yeo; II Hong Suh; Byung-Ju Yi; Sang-Rok Oh

1999-01-01

326

SAW arrays using dendrimers and pattern recognition to detect volatile organics  

SciTech Connect

chemical sensor arrays eliminate the need to develop a high-selectivity material for every analyte. The application of pattern recognition to the simultaneous responses of different microsensors enables the identification and quantification of multiple analytes with a small array. Maximum materials diversity is the surest means to create an effective array for many analytes, but using a single material family simplifies coating development. Here the authors report the successful combination of an array of six dendrimer films with mass-sensitive SAW (surface acoustic wave) sensors to correctly identify 18 organic analytes over wide concentration ranges, with 99.5% accuracy. The set of materials for the array is selected and the results evaluated using Sandia`s Visual-Empirical Region of Influence (VERI) pattern recognition (PR) technique. The authors evaluated eight dendrimer films and one self-assembled monolayer (SAM) as potential SAW array coatings. The 18 organic analytes they examined were: cyclohexane, n-hexane, i-octane, kerosene, benzene, toluene, chlorobenzene, carbon tetrachloride, trichloroethylene, methanol, n-propanol, pinacolyl alcohol, acetone, methyl isobutyl ketone, dimethylmethylphosphate, diisopropylmethylphosphonate, tributylphosphate, and water.

Ricco, A.J.; Osbourn, G.C.; Bartholomew, J.W.; Martinez, R.F. [Sandia National Labs., Albuquerque, NM (United States); Crooks, R.M.; Garcia, M.E.; Peez, R. [Texas A and M Univ., College Station, TX (United States). Dept. of Chemistry; Spindler, R. [Michigan Molecular Inst., Midland, MI (United States); Kaiser, M.E. [Dendritech, Inc., Midland, MI (United States)

1998-08-01

327

Hierarchical Matrices in the See-Saw Mechanism, large Neutrino Mixing and Leptogenesis  

E-print Network

We consider the see-saw mechanism for hierarchical Dirac and Majorana neutrino mass matrices m_D and M_R, including the CP violating phases. Simple arguments about the structure of the neutrino mass matrix and the requirement of successful leptogenesis lead to the situation that one of the right-handed Majorana neutrinos is much heavier than the other two, which in turn display a rather mild hierarchy. It is investigated how for the neutrino mixing one small and two large angles are generated. The mixing matrix element |U_{e3}|^2 is larger than 10^{-3} and a characteristic ratio between the branching ratios of lepton flavor violating charged lepton decays \\ell_j -> \\ell_i \\gamma is found. Successful leptogenesis implies sizable CP violation in oscillation experiments. As in the original minimal see-saw model, the signs of the baryon asymmetry of the universe and of the CP asymmetry in neutrino oscillations are equal and there is no connection between the leptogenesis phase and the effective mass as measurable in neutrinoless double beta decay.

Werner Rodejohann

2003-11-11

328

Flipped SU(5), see-saw scale physics and degenerate vacua  

E-print Network

We investigate the requirement of the existence of two degenerate vacua of the effective potential as a function of the Weinberg-Salam Higgs scalar field norm, as suggested by the multiple point principle, in an extension of the Standard Model including see-saw scale physics. Results are presented from an investigation of an extension of the Standard Model to the gauge symmetry group SU(3)_C\\times SU(2)_L\\times U(1)'\\times \\tilde U(1), where two groups U(1)' and \\tilde U(1) originate at the see-saw scale M_{SS}, when heavy (right-handed) neutrinos appear. The consequent unification of the group SU(3)_C\\times SU(2)_L\\times U(1)' into the flipped SU(5) at the GUT scale leads to the group SU(5)\\times \\tilde U(1). We assume the position of the second minimum of the effective potential coincides with the fundamental scale, here taken to be the GUT scale. We solve the renormalization group equations in the one-loop approximation and obtain a top-quark mass of 171\\pm 3 GeV and a Higgs mass of 129\\pm 4 GeV, in the case when the Yukawa couplings of the neutrinos are less than half that of the top quark at the GUT scale.

C. R. Das; C. D. Froggatt; L. V. Laperashvili; H. B. Nielsen

2005-07-15

329

Lepton Number Violation in TeV Scale See-Saw Extensions of the Standard Model  

E-print Network

The low-energy neutrino physics constraints on the TeV scale type I see-saw scenarios of neutrino mass generation are revisited. It is shown that lepton charge (L) violation, associated to the production and decays of heavy Majorana neutrinos N_{j} having masses in the range of M_j \\sim (100 \\div 1000) GeV and present in such scenarios, is hardly to be observed at ongoing and future particle accelerator experiments, LHC included, because of very strong constraints on the parameters and couplings responsible for the corresponding |\\Delta L| = 2 processes. If the heavy Majorana neutrinos N_j are observed and they are associated only with the type I mechanism, they will behave effectively like pseudo-Dirac fermions. Conversely, the observation of effects proving the Majorana nature of N_j would imply that these heavy neutrinos have additional relatively strong couplings to the Standard Model particles or that light neutrino masses compatible with the observations are generated by a mechanism other than see-saw (e.g., radiatively at one or two loop level) in which the heavy Majorana neutrinos N_j are nevertheless involved.

A. Ibarra; E. Molinaro; S. T. Petcov

2011-01-30

330

Minimal predictive see-saw model with normal neutrino mass hierarchy  

E-print Network

We consider the type I see-saw model with two right-handed neutrinos and a normal neutrino mass hierarchy and impose a zero coupling between the right-handed neutrino mainly responsible for the atmospheric neutrino mass and the electron neutrino. We derive a master formula which relates see-saw input parameters in a one to one correspondence with physical neutrino observables. Using the master formula we search for simple ratios of couplings consistent with current data on neutrino mass and lepton mixing. We discover a minimal predictive example in which the right-handed neutrino mainly responsible for the atmospheric neutrino mass has couplings to (nu_e, nu_mu, nu_tau) proportional to (0,1,1) and the right-handed neutrino mainly responsible for the solar neutrino mass has couplings to (nu_e, nu_mu, nu_tau) proportional to (1,1,3) or (1,3,1), with a relative phase eta = -/+ pi/3, providing the link between leptogenesis and CP violation in neutrino oscillation experiments. We show how these patterns of couplings could arise from an A_4 family symmetry model of leptons which predicts all the PMNS parameters in terms of the neutrino mass ratio m_2/m_3, corresponding to approximate Tri-bimaximal-Cabibbo mixing, accurate to one degree, with the prediction delta = +/- pi/2.

Stephen F. King

2013-04-23

331

See-saw neutrino masses and large mixing angles in the vortex background on a sphere  

E-print Network

In the vortex background on a sphere, a single 6-dimensional fermion family gives rise to 3 zero-modes in the 4-dimensional point of view, which may explain the replication of families in the Standard Model. Previously, it had been shown that realistic hierarchical mass and mixing patterns can be reproduced for the quarks and the charged leptons. Here, we show that the addition of a single heavy 6-dimensional field that is gauge singlet, unbound to the vortex, and embedded with a bulk Majorana mass enables to generate 4D Majorana masses for the light neutrinos through the see-saw mechanism. The scheme is very predictive. The hierarchical structure of the fermion zero-modes leads automatically to an inverted pseudo-Dirac mass pattern, and always predicts one maximal angle in the neutrino see-saw matrix. It is possible to obtain a second large mixing angle from either the charged lepton or the neutrino sector, and we demonstrate that this model can fit all observed data in neutrino oscillations experiments. Also, U_{e3} is found to be of the order ~0.1.

Jean-Marie Frère; Maxim Libanov; Fu-Sin Ling

2010-06-27

332

Bi-Large Neutrino Mixing See-Saw Mass Matrix with Texture Zeros and Leptogenesis  

E-print Network

We study constraints on neutrino properties from texture zeros in bi-large mixing See-Saw mass matrix and also from leptogenesis. Texture zeros may occur in the light (class a)) or in the heavy (class b)) neutrino mass matrices. Each of these two classes has 5 different forms which can produce non-trivial three generation mixing with at least one texture zero. We find that two types of texture zero mass matrices in both class a) and class b) can be consistent with present data on neutrino masses, mixing and produce the observed baryon asymmetry of the universe. None of the neutrinos can have zero masses with the lightest of the light neutrinos having a mass larger than about 0.039 eV for class a) and 0.002 eV for class b). In these models although CKM CP violating phase vanishes, non-zero Majorana phases, however, can exist and play an important role in producing the observed baryon asymmetry in our universe through leptogenesis mechanism. The requirement of producing the observed baryon asymmetry can further distinguish different models and also restrict the See-Saw scale to be in the range $10^{12}\\sim 10^{15}$ GeV.

Wei Chao; Xiao-Gang He; Xue-Qian Li

2005-03-30

333

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

334

SoilSaw{trademark} demonstration. Final report, September 1992--January 1995  

SciTech Connect

The US Department of Energy (DOE) has identified leaking underground storage tanks and buried mixed waste at numerous sites within the DOE complex. Preventing these wastes from entering the environment is a challenging task. One method of preventing waste migration is to isolate the contaminants using subsurface containment barriers. Isolation and containment can be accomplished by both in situ and ex situ methods. This report describes a novel in situ construction method of forming vertical containment barriers (slurry walls) using the SoilSaw{trademark} Barrier System. The SoilSaw{trademark} Barrier System is shown to be a feasible process for constructing subsurface vertical containment barriers to depths of fifty feet. The process is most efficient in sandy soil (including free flowing sand) with barrier construction rates of over 130 square feet per minute. Productivity diminishes to approximately 30 square feet per minute as soils become harder and more cohesive. The present hardware is designed to form a barrier of approximately 12 inch in width. Additional barrier widths can be constructed with this technology by application of wider jet heads. The requirement for a varied arrangement of barrier widths is an increase in hydraulic horse power and additional jet heads.

Saugier, K.; Isaac, R.E.

1996-02-01

335

Determination of Physical Response in (Mo/AlN) SAW Devices  

NASA Astrophysics Data System (ADS)

This paper describes the experimental conditions in surface acoustic wave (SAW) designed on aluminum nitride (AlN) films grown on Si3N4 substrates by using pulsed laser deposition. Moreover it was studied the dependency of optical properties with temperature of deposition. The thickness, measured by profilometry technology, was 150 nm for all films. Moreover, SAW devices with a Mo/AlN/Si3N4 configuration were fabricated employing AlN buffer and Mo Channel. The morphology and composition of the films were studied using atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy analysis (XPS), respectively. The optical reflectance spectra and color coordinates of the films were obtained by optical spectral reflectometry technique in the range of 400-900 cm-1. In this work, a clear dependence in morphological properties, optical properties, frequency response and acoustic wave velocity as function of applied deposition temperature was found. It was also observed a reduction in reflectance of about 10% and an increase of acoustic wave velocity of about 1.2% when the temperature was increased from 200°C to 630°C.

Caicedo, J. C.; Pérez, J. A.; Caicedo, H. H.; Riascos, H.

2013-04-01

336

See-saw neutrino masses and large mixing angles in the vortex background on a sphere  

NASA Astrophysics Data System (ADS)

In the vortex background on a sphere, a single 6-dimensional fermion family gives rise to 3 zero-modes in the 4-dimensional point of view, which may explain the replication of families in the Standard Model. Previously, it had been shown that realistic hierarchical mass and mixing patterns can be reproduced for the quarks and the charged leptons. Here, we show that the addition of a single heavy 6-dimensional field that is gauge singlet, unbound to the vortex, and embedded with a bulk Majorana mass enables to generate 4D Majorana masses for the light neutrinos through the see-saw mechanism. The scheme is very predictive. The hierarchical structure of the fermion zero-modes leads automatically to an inverted pseudo-Dirac mass pattern, and always predicts one maximal angle in the neutrino see-saw matrix. It is possible to obtain a second large mixing angle from either the charged lepton or the neutrino sector, and we demonstrate that this model can fit all observed data in neutrino oscillations experiments. Also, U e3 is found to be of the order ? ˜ 0 .1.

Frère, J.-M.; Libanov, M.; Ling, F.-S.

2010-09-01

337

Safety and security monitoring of dams using nano-micromachined-based surface acoustic wave (SAW) sensors  

NASA Astrophysics Data System (ADS)

Concerns about the safety of concrete dams have increased during recent years, partly because the population at risk in locations downstream of major dams continues to expand and also because these old dams are experiencing long-term damage and the seismic design concepts used to build them were inadequate. Reliable techniques for continuous monitoring of certain key parameters affecting the dams' integrity are currently nonexistent and this is because of the lack of sensing technology capable to function in a hostile environment such as low temperatures and high moisture level. This paper presents new low cost, passive and wireless micro-machined SAW-based sensors to monitor the safety and security of dams. These SAW sensors are composed of MEMS transducers, Nano-polymer actuators and an antenna, and are deposited on a thin film substrate. The sensors are passive, do not require power on-board and can be interrogated wireless using a radar. When embedded into concrete dams, the devices will be able to detect and locate internal cracks and measure certain key parameters affecting the durability of dams such as temperature, moisture, pH, chloride and carbon dioxide.

Ross, Wayne, Jr.; Saafi, Mohamed; Romine, Peter; Xiao, Zhigang; Pett, Dave

2006-03-01

338

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

339

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

340

Constraint on the heavy sterile neutrino mixing angles in the SO(10) model with double see-saw mechanism  

E-print Network

Constraints on the heavy sterile neutrino mixing angles are studied in the framework of a minimal supersymmetric ${\\rm SO}(10)$ model with {\\it double see-saw mechanism}. A new singlet matter in addition to the right-handed neutrinos is introduced to realize the double see-saw mechanism. The minimal ${\\rm SO}(10)$ model gives an unambiguous Dirac neutrino mass matrix, which enables us to predict the masses and the mixing angles in the enlarged $9 \\times 9$ neutrino mass matrix. Mixing angles between the light Majorana neutrinos and the heavy sterile neutrinos are shown to be within the LEP experimental bound on all ranges of the Majorana phases.

Takeshi Fukuyama; Tatsuru Kikuchi; Koichi Matsuda

2005-10-05

341

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

342

Minimal see-saw model predicting best fit lepton mixing angles  

NASA Astrophysics Data System (ADS)

We discuss a minimal predictive see-saw model in which the right-handed neutrino mainly responsible for the atmospheric neutrino mass has couplings to (?e ,?? ,??) proportional to (0 , 1 , 1) and the right-handed neutrino mainly responsible for the solar neutrino mass has couplings to (?e ,?? ,??) proportional to (1 , 4 , 2), with a relative phase ? = - 2 ? / 5. We show how these patterns of couplings could arise from an A4 family symmetry model of leptons, together with Z3 and Z5 symmetries which fix ? = - 2 ? / 5 up to a discrete phase choice. The PMNS matrix is then completely determined by one remaining parameter which is used to fix the neutrino mass ratio m2 /m3. The model predicts the lepton mixing angles ?12 ?34? ,?23 ?41? ,?13 ?9.5?, which exactly coincide with the current best fit values for a normal neutrino mass hierarchy, together with the distinctive prediction for the CP violating oscillation phase ? ?106?.

King, Stephen F.

2013-07-01

343

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

344

Surface acoustic wave (SAW) device using piezoelectric cellulose EAPap: fabrication and characterization  

NASA Astrophysics Data System (ADS)

Novel smart materials have been suggested for various sensor applications such as chemical sensor, bio sensor, wireless communication, and radio frequency identification (RF-ID) devices. It was reported that bio-compatible and as well as bio-degradable, naturally abundant, and flexible piezoelectric cellulose electro-active paper (EAPap) had a great industrial potential due to its piezoelectricity. Here we studied the feasibility of surface acoustic wave (SAW) devices using thin piezoelectric cellulose EAPap. The single inter-digit transducer (IDT) pattern with 10 ?m finger width was designed and fabricated on thin piezoelectric EAPap using lift-off technique. The frequency response to different vapor dose of isopropyl alcohol under will be presented.

Kim, Joo-Hyung; Yun, Gyu-Young; Jang, Sang-Dong; Lee, Min-Hee; Kim, Jaehwan

2009-03-01

345

Evaluation of Residual Stresses Using Laser-Generated SAWs on Surface of Laser-Welding Plates  

NASA Astrophysics Data System (ADS)

In this paper, residual stresses in laser-welding plates are studied by both numerical simulation and experiment based on laser ultrasonics. First, a three-dimensional finite-element model is developed to predict temperature distributions and thermo-structure response during the laser-welding process of an aluminum alloy plate, and the residual stresses around the joint are described from structure analysis. After that, experiments based on surface acoustic waves generated by a pulsed laser are carried out to determine the velocity distribution of SAWs around the joint, from which the distribution of main residual stresses are calculated according to acoustoelastic theory. By comparing the thermal-structure model results with the measurements, it is found that the numerical simulation results are in good agreement with the experimental data.

Dong, Li-ming; Li, Jia; Ni, Chen-yin; Shen, Zhong-hua; Ni, Xiao-wu

2013-06-01

346

Economics of ingot slicing with an internal diameter saw for low-cost solar cells  

NASA Technical Reports Server (NTRS)

Slicing of silicon ingots using diamond impregnated internal diameter blade saws has been a standard technology of the semiconductor industry. This paper describes work on improvements to this technology for 10 cm diameter ingot slicing. Ingot rotation, dynamic blade edge control with feedback, mechanized blade dressing and development of thinner blades are the approaches tried. A comparison of the results for wafering with and without ingot rotation is also made. A sensitivity analysis of the major cost elements in wafering is performed for 10 cm diameter ingot and extended to the 15 cm diameter ingot case. Various parameter values such as machine cost, feed rate and consumable materials cost are identified both for single and multiple ingot slicing.

Daud, T.; Liu, J. K.; Fiegl, G.

1981-01-01

347

Instanton counting with a surface operator and the chain-saw quiver  

E-print Network

We describe the moduli space of SU(N) instantons in the presence of a general surface operator of type N=n_1+ ... +n_M in terms of the representations of the so-called chain-saw quiver, which allows us to write down the instanton partition function as a summation over the fixed point contributions labeled by Young diagrams. We find that the instanton partition function depends on the ordering of n_I which fixes a choice of the parabolic structure. This is in accord with the fact that the Verma module of the W-algebra also depends on the ordering of n_I. By explicit calculations, we check that the partition function agrees with the norm of a coherent state in the corresponding Verma module.

Hiroaki Kanno; Yuji Tachikawa

2011-05-02

348

A numerical adaptation of SAW identities from the honeycomb to other 2D lattices  

E-print Network

Recently, Duminil-Copin and Smirnov proved a long-standing conjecture by Nienhuis that the connective constant of self-avoiding walks on the honeycomb lattice is $\\sqrt{2+\\sqrt{2}}.$ A key identity used in that proof depends on the existence of a parafermionic observable for self-avoiding walks on the honeycomb lattice. Despite the absence of a corresponding observable for SAW on the square and triangular lattices, we show that in the limit of large lattices, some of the consequences observed on the honeycomb lattice persist on other lattices. This permits the accurate estimation, though not an exact evaluation, of certain critical amplitudes, as well as critical points, for these lattices. For the honeycomb lattice an exact amplitude for loops is proved.

Nicholas R Beaton; Anthony J Guttmann; Iwan Jensen

2011-10-06

349

New chalcanonol glycoside from the seeds of saw palmetto: antiproliferative and antioxidant effects.  

PubMed

A new chalcanonol glycoside dimer, bis-O-[(I-4') ? (II-6')]-?-hydroxyphloretin-2'-O-?-glucoside (1), in addition to six known compounds, namely ( - )-epicatechin (2) and ( - )-epiafzelechin (3), 4-hydroxybenzoic acid (4), protocatechuic acid (5), methylgallate (6), ?-sitosterol (7) and ?-sitosterol-3-O-glucoside (8), was isolated from the seeds of saw palmetto. The structures of the isolated compounds were established from the analysis of their MS and 1D and 2D NMR spectroscopic data. The antiproliferative activities of the isolated compounds towards PC3, the human prostate cancer cells were investigated. Amongst the isolated compounds, the new compound and the sterolic derivatives showed antiproliferative effects. Screening of the antioxidant effects of the isolated compounds by 2,2'-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid radical assay revealed that the isolated phenolics were active free radical scavengers. PMID:25230777

Abdel Bar, Fatma M

2014-09-18

350

Strict Authentication Watermarking with JPEG Compression (SAW-JPEG) for Medical Images  

E-print Network

This paper proposes a strict authentication watermarking for medical images. In this scheme, we define region of interest (ROI) by taking the smallest rectangle around an image. The watermark is generated from hashing the area of interest. The embedding region is considered to be outside the region of interest as to preserve the area from distortion as a result from watermarking. The strict authentication watermarking is robust to some degree of JPEG compression (SAW-JPEG). JPEG compression will be reviewed. To embed a watermark in the spatial domain, we have to make sure that the embedded watermark will survive JPEG quantization process. The watermarking scheme, including data embedding, extracting and verifying procedure were presented. Experimental results showed that such a scheme could embed and extract the watermark at a high compression rate. The watermark is robust to a high compression rate up to 90.6%. The JPEG image quality threshold is 60 for the least significant bit embedding. The image quality ...

Zain, Jasni Mohamad

2011-01-01

351

SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors  

PubMed Central

One-port surface acoustic wave (SAW) devices with defined reflector patterns give characteristic signal patterns in the time domain making them identifiable and leading to so-called RFID-Tags. Each sensor responds with a burst of signals, their timed positions giving the identification code, while the amplitudes can be related to the analyte concentration. This paper presents the first combination of such a transducer with chemically sensitive layer materials. These include crosslinked polyvinyl alcohol for determining relative humidity and tert-butylcalix[4]arene for detecting solvent vapors coated on the free space between the reflectors. In going from the time domain to the frequency domain by Fourier transformation, changes in frequency and phase lead to sensor responses. Hence, it is possible to measure the concentration of tetrachloroethene in air down to 50 ppm, as well as 1% changes in relative humidity. PMID:22303149

Lieberzeit, Peter A.; Palfinger, Christian; Dickert, Franz L.; Fischerauer, Gerhard

2009-01-01

352

The study of space communications spread spectrum systems. Part 1: Saw-based joint group demodulation of frequency shift keyed and differential phase shift keyed signals  

Microsoft Academic Search

A surface acoustic wave (SAW) device based processor, capable of the joint group demodulation of frequency shift keying (FSK) and differential phase shift keying (DPSK) signals, and intended for use in the Canadian extremely high frequency (EHF) Satcom system is proposed. The processor is based on the ability of SAW filters to implement wideband, real time, Fourier transforms with an

Peter T. Traynor; Peter J. McLane

1990-01-01

353

Laboratory Evaluation to Reduce Respirable Crystalline Silica Dust When Cutting Concrete Roofing Tiles Using a Masonry Saw  

Microsoft Academic Search

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

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

2010-01-01

354

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.

355

The last century saw an explosion in activity in every avenue of materials science. As the understanding  

E-print Network

The last century saw an explosion in activity in every avenue of materials science materials chips' by Xiang and Schultz6, and the field of combinatorial materials science still appearsDepartment of Materials Science and Engineering and Center for Superconductivity Research, University

Rubloff, Gary W.

356

A saw-tooth genetic algorithm combining the effects of variable population size and reinitialization to enhance performance  

Microsoft Academic Search

A genetic algorithm (GA) is proposed that uses a variable population size and periodic partial reinitialization of the population in the form of a saw-tooth function. The aim is to enhance the overall performance of the algorithm relying on the dynamics of evolution of the GA and the synergy of the combined effects of population size variation and reinitialization. Preliminary

Vlasis K. Koumousis; Christos P. Katsaras

2006-01-01

357

b-tau unification and large atmospheric mixing: a case for non-canonical see-saw  

E-print Network

We study the second and third generation masses in the context of the minimal renormalizable SO(10) theory. We show that if the see-saw takes the non-canonical (type II) form, large atmospheric neutrino mixing angle requires b-tau unification.

Borut Bajc; Goran Senjanovic; Francesco Vissani

2002-10-15

358

Analysis and design of low-loss SAW devices with internal reflections using coupling-of-modes theory  

Microsoft Academic Search

The analysis and design of a new family of SAW (surface acoustic wave) devices which take advantage of distributed internal reflections are discussed. It is noted that the deliberate inclusion of reflections makes many new devices possible. Among these are new low-loss filter structures, resonators and notch elements. However, the inclusion of internal reflections significantly complicates the analysis of these

P. V. Wright

1989-01-01

359

A new efficient combined FEM and periodic Green's function formalism for the analysis of periodic SAW structures  

Microsoft Academic Search

Analyzing periodic structures on a semi-infinite piezoelectric substrate is one of the most important problems being investigated by SAW researchers. Recently, numerical mixed FEM\\/BEM models have been presented to analyze periodic transducers including mass loading effects and the effectiveness of these methods have been demonstrated. However, the numerical interpolation used (“pulse function” or FEM basis function) is not well suited

P. Ventura; J. M. Hode; M. Solal

1995-01-01

360

Safety and Toxicity of Saw palmetto in the Complementary and Alternative Medicine for Urological Symptoms (CAMUS) Trial  

PubMed Central

Purpose Extracts of the saw palmetto berry are used by many men in the U.S. as self-treatment for lower urinary tract symptoms due to benign prostatic hyperplasia. While the most recent data from double-blind clinical trials do not support efficacy superior to that of placebo, there are few data on the toxicity of saw palmetto. Materials and Methods 369 patients were randomized in the Complementary and Alternative Medicine for Urological Symptoms (CAMUS) trial; 357 participants are included in this modified intention-to-treat analysis. Participants were randomized to 320mg, 640mg, and 960mg daily of an ethanolic saw palmetto extract or an identical-appearing placebo, in an escalating manner at 6-month intervals, for a total of 18 months follow-up. Adverse-event assessments, vital signs, and blood and urine laboratory tests were obtained at regular intervals. Results There were no statistically significant differences between groups in rates of serious or non-serious adverse events, changes in vital signs, digital prostate exam findings, or study withdrawal rates. Overall, there were no significant inter-group differences in the occurrence of laboratory-test abnormalities; differences in individual laboratory tests were uncommon and small in magnitude. No evidence of significant dose-response phenomena were identified. Conclusions The saw palmetto extract used in the CAMUS trial showed no evidence of toxicity at doses up to three times the usual clinical dose over a period of 18 months. PMID:23063633

Avins, Andrew L.; Lee, Jeannette Y.; Meyers, Catherine M.; Barry, Michael J.

2013-01-01

361

On the Old Saw That Dialogue Is a Socratic but Not an Aristotelian Method of Moral Education  

ERIC Educational Resources Information Center

Kristján Kristjánsson's aim in this article is to bury the old saw that dialogue is exclusively a Socratic but not an Aristotelian method of education for moral character. Although the truncated discussion in Aristotle's "Nicomachean Ethics" of the character development of the young may indicate that it is merely the result of…

Kristjánsson, Kristján

2014-01-01

362

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

363

[The woman, who saw her husband approach upside down: disorder of spatial orientation after removal of an acoustic neuroma].  

PubMed

A 60-year-old woman experienced a severe spatial disorientation after sudden interruption of the right vestibulocochlear nerve (on removal of an acustic neurinoma). She saw her husband approaching to her bed upside-down. This "reversal of vision metamorphopsia" resolved after a few hours. PMID:10483564

Kommerell, G

1999-08-01

364

Media Summary 15-28 November 2014 Daily Mail Would you intervene if you saw domestic abuse happening in public  

E-print Network

Media Summary 15-28 November 2014 Coverage Daily Mail ­ Would you intervene if you saw domestic abuse happening in public LeFigaro ­ Un robot face a un dilemme The Globe and Mail ­ On world toilet day

West of England, University of the

365

A phytochemical comparison of saw palmetto products using gas chromatography and 1H nuclear magnetic resonance spectroscopy metabolomic profiling  

PubMed Central

Objectives Preparations containing saw palmetto berries are used in the treatment of benign prostatic hyperplasia (BPH). There are many products on the market, and relatively little is known about their chemical variability and specifically the composition and quality of different saw palmetto products notwithstanding that in 2000, an international consultation paper from the major urological associations from the five continents on treatments for BPH demanded further research on this topic. Here, we compare two analytical approaches and characterise 57 different saw palmetto products. Methods An established method – gas chromatography – was used for the quantification of nine fatty acids, while a novel approach of metabolomic profiling using 1H nuclear magnetic resonance (NMR) spectroscopy was used as a fingerprinting tool to assess the overall composition of the extracts. Key findings The phytochemical analysis determining the fatty acids showed a high level of heterogeneity of the different products in the total amount and of nine single fatty acids. A robust and reproducible 1H NMR spectroscopy method was established, and the results showed that it was possible to statistically differentiate between saw palmetto products that had been extracted under different conditions but not between products that used a similar extraction method. Principal component analysis was able to determine those products that had significantly different metabolites. Conclusions The metabolomic approach developed offers novel opportunities for quality control along the value chain of saw palmetto and needs to be followed further, as with this method, the complexity of a herbal extract can be better assessed than with the analysis of a single group of constituents. PMID:24417505

Booker, Anthony; Suter, Andy; Krnjic, Ana; Strassel, Brigitte; Zloh, Mire; Said, Mazlina; Heinrich, Michael

2014-01-01

366

Pseudochaos and anomalous transport: A study on saw-tooth map  

NASA Astrophysics Data System (ADS)

The observation of chaotic dynamics in digital filter in late 1980s propelled the interest in piecewise linear map beyond the border of theoretical electrical engineering. Also, during last two decades, various physical models and phenomena, such as stochastic web and sticky orbits, not only broadened our knowledge of chaos but also urged us to further our understanding of meaning of chaos and randomness. In this dissertation, a piecewise linear kicked oscillator model: saw-tooth map, is studied as an example of pseudochaos. Physically, kicked oscillator model describes one-dimensional harmonic oscillator effected by delta-like kicks from external force source at certain fixed frequency. Starting from a special case of global periodicity, numerical investigations were carefully carried out in two cases that deviate from global periodicity. We observe the appearance of stochastic web structure and accompanying erratic dynamical behavior in the system that can't be fully explained by the classical Kolmogorov-Arnold-Moser theorem. Also anomalous transport occurs in both cases. We perform accurate analysis of Poincare recurrences and reconstruct the probability density function of Poincare recurrence times, which suggests a relation between the transport and the Poincare recurrence exponents. Saw-tooth map has non-uniform phase space, in which domains of regular dynamics and domains of chaotic dynamics are intertwined. The large-scale dynamics of the system is hugely impacted by the heterogeneity of the phase space, especially by the existence of hierarchy of periodic islands. We carefully study the characteristics of phase space and numerically compute fractal dimensions of the so-called exceptional set Delta in both cases. Our results suggest that the fractal dimension is strictly less than 2 and that the fractal structures are unifractal rather than multifractal. We present a phenomenological theoretical framework of Fractional Kinetic Equation (FKE) and Renormalization Group of Kinetics (RGK). FKE, which is fractional generalization of the Fokker-Planck-Kolmogorov equation, adopts the fractality of time and space and serves probabilistic description of chaos in Hamiltonian systems. RGK bridges the self-similar structure in phase space and large-scale behavior of the dynamics, and establishes relationships among fractality, transport and Poincare recurrences.

Fan, Rong

367

Predicting the Relationship Between System Vibration with Rock Brittleness Indexes in Rock Sawing Process  

NASA Astrophysics Data System (ADS)

The system vibration is a very significant measure of the sawing performance, because it indicates the amount of energy required to saw the rock. The maintenance cost of system is also dependant on system vibration. A few increases in system vibration cause a huge increase in the maintenance cost of the system. In this paper, the vibration of system in terms of RMSa was investigated and models for estimation of vibration by means of rock brittleness indexes and operational specifications were designed via statistical models and multiple curvilinear regression analysis. In this study, the relationships between rock brittleness indexes and operational specifications were investigated by regression analysis in statistical package for social science (SPSS) and the results of determination coefficients have been presented. In the second part, the diagrams show that a point lying on the line indicates an exact estimation. In the plot for model, the points are scattered uniformly about the diagonal line, suggesting that the models are good. It is very useful to evaluate the vibration of system and select the suitable operational characteristics by only some mechanical properties of rock. Drgania uk?adu uwa?ane s? za miernik wydajno?ci procesu urabiania, poniewa? pokazuj? ilo?? energii niezb?dnej do urabiania ska?y. Od poziomu drga? zale?? tak?e koszty eksploatacji systemu. Nieznaczny nawet wzrost poziomu drga? prowadzi do znacznego zwi?kszenia kosztów eksploatacyjnych urz?dzenia. W pracy tej przeprowadzono analiz? drga? (ich warto?ci skutecznych) i opracowano model estymacji poziomu drga? w oparciu o wspó?czynnik krucho?ci ska? i parametry eksploatacyjne urz?dzenia. W pracy wykorzystano modele statystyczne i wielokrotn? analiz? metod? regresji krzywoliniowej. W pracy obecnej zwi?zek pomi?dzy wspó?czynnikiem krucho?ci ska? a parametrami eksploatacyjnymi urz?dzenia badano z wykorzystaniem analizy metod? regresji dost?pnej w statystycznym pakiecie oprogramowania dla nauk spo?ecznych (SPSS) a wyniki podano w postaci wyznaczonych wspó?czynników. W drugiej cz??ci pracy przedstawiono wykres pokazuj?cy, ze punkt le??cy na linii oznacza dok?adne oszacowanie. W wykresie wykonanym dla modelu punkty rozrzucone s? równomiernie wokó? linii przek?tnej, co sugeruje ?e modele s? w?a?ciwe. Okre?lenie poziomu drga? urz?dzenia jest niezwykle korzystnym zabiegiem pozwalaj?cym na dobór parametrów pracy urz?dzenia jedynie w oparciu o mechaniczne w?a?ciwo?ci ska?.

Mikaeil, Reza; Ataei, Mohammad; Ghadernejad, Saleh; Sadegheslam, Golsa

2014-03-01

368

TALSPEAK CURVE: AN ILLUSTRATION OF A SEE-SAW EFFECT IN SEPARATIONS  

SciTech Connect

A superbly balanced thermodynamic struggle for metal ion coordination by aqueous aminopolycarboxylate reagent, DTPA, and non-aqueous organophosphorous phase transfer reagent, HDEHP, affords the separation of trivalent actinides from trivalent lanthanides under the umbrella of the Talspeak liquid-liquid distribution process. This thermodynamic relationship has been linked to an analogous “see-saw” behavior, where the balance is distorted when either of the key complexing players is subject to adverse conditions that interfere with their optimal operation. The thermodynamic balance is tipped in favour of HDEHP whenever increased acidity of the aqueous solution out-competes the metal ion complexation by aqueous complexing agent. Also enhanced steric crowding may switch-off efficient coordination of the metal ion. When HDEHP is depolymerised due to the presence of aliphatic alcohol in the organic phase its phase transferring power is diminished. Such complication paves way for DTPA to establish its dominance on the distribution of trivalent metal ions in the 2-phase system. The illustrated sensitivity of the thermodynamic balance between DTPA and HDEHP in Talspeak-type systems may serve as informative tool when studying less-predictable realms of Talspeak chemistry.

Peter Zalupski; Leigh Martin

2010-11-01

369

Study of flow induced by sine wave and saw tooth plasma actuators  

NASA Astrophysics Data System (ADS)

The effect of plasma actuator that uses saw-tooth or sine-wave shape electrodes on boundary layer flows is experimentally investigated. The measurement results are compared with a corresponding standard configuration (conventional design using two rectangular strip electrodes)—the actuator that produces a nearly two-dimensional horizontal wall jet upon actuation. PIV measurements are used to characterize the actuators in a quiescent chamber. Operating in a steady manner, the new actuators result in the formation of streamwise and spanwise vortices. That is to say, the new actuators render the plasma actuators inducing three-dimensional variations in the shear layer, offering significant flexibility in flow control. The affected flowfield with the new actuators is significantly larger than that with the conventional linear actuators. While the conventional linear actuators affect primarily the boundary layer flow on a scale of about 1 cm above the wall, the new actuators affect the near wall region at a significantly larger scale. This new design broadens the applicability and enhances the flow control effects and it is potentially a more efficient flow control device.

Liu, Zhifeng; Wang, Lianze; Fu, Song

2011-11-01

370

Low Energy Signatures of the TeV Scale See-Saw Mechanism  

E-print Network

We study a type I see-saw scenario where the right-handed (RH) neutrinos, responsible for the light neutrino mass generation, lie at the electroweak scale. Under certain conditions, the strength of the charged and neutral current weak interactions of the Standard Model particles with the heavy RH neutrinos can be large enough to allow their production at the LHC, opening also the possibility of observing other low energy signatures of the new physics in the electroweak precision observables as well as in searches for rare leptonic decays or neutrinoless double beta decay. We argue that in this scenario the flavour structure of the neutrino Yukawa couplings is essentially determined by the low energy neutrino parameters, leading to fairly strong correlations among the new phenomena. In particular, we show that the present bound on the $\\mu \\to e +\\gamma$ decay rate makes very difficult the observation of the heavy RH neutrinos at the LHC or the observation of deviations from the Standard Model predictions in the electroweak precision data. We also argue that all present experimental constraints on this scenario still allow i) for an enhancement of the rate of neutrinoless double beta decay, which thus can be in the range of sensitivity of the GERDA experiment even when the light Majorana neutrinos possess a normal hierarchical mass spectrum, and ii) for the predicted $\\mu \\to e+ \\gamma$ decay rate to be within the sensitivity range of the MEG experiment.

A. Ibarra; E. Molinaro; S. T. Petcov

2011-03-31

371

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

372

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

373

Chemical quality of the Saw Mill River, Westchester County, New York, 1981-83  

USGS Publications Warehouse

Surface waters, bottom sediments and coatings formed on artificial substrates (ceramic tiles) were analyzed to evaluate the chemical quality of the Saw Mill River, New York. Heavy metals, nutrients, and organic contaminants were studied. Dissolved orthophosphate concentrations were highest in the lower third of the river. Dissolved manganese was the only metal to exceed U.S. Environmental Protection Agency water-quality criteria. Arsenic, cadmium, copper, lead, and zinc concentrations were highest in waters from the lowest 4 river miles. Concentrations of copper, lead, and zinc in bottom sediments from the lowest 3 river miles were greater than in upstream sediments. Concentrations of nine heavy metals were higher on tiles emplaced below river mile 3 than on tiles upstream. Few organic compounds were detected in the water column; none persisted at all sites. Chlordane, DDD, DDE, DDT, dieldrin, and polychlorinated biphenyls (PCB's) were found in bottom sediments throughout the basin. PCB concentrations were highest in the lowest 6 river miles; the other organic compounds exhibited no spatial patterns. Polynuclear aromatic hydrocarbons were most abundant in bottom sediments from the lowest 2 river miles. Collectively the distribution of contaminants indicates that river quality deteriorates in the lower, more heavily urbanized reach. (USGS)

Rogers, R.J.

1984-01-01

374

Continuous in vivo blood pressure measurements using a fully implantable wireless SAW sensor.  

PubMed

In this paper, the development of a fully implantable wireless sensor able to provide continuous real-time accurate pressure measurements is presented. Surface Acoustic Wave (SAW) technology was used to deposit resonators on crystalline quartz wafers; the wafers were then assembled to produce a pressure sensitive device. Excitation and reading via a miniature antenna attached to the pressure sensor enables continuous external interrogation. The main advantages of such a configuration are the long term stability of quartz and the low power necessary for the interrogation, which allows 24/7 interrogation by means of a hand-held, battery powered device. Such data are of vital importance to clinicians monitoring and treating the effects of hypertension and heart failure. A prototype was designed and tested using both a bio-phantom test rig and an animal model. The pressure traces for both compare very well with a commercially available catheter tip pressure transducer. The work presented in this paper is the first known wireless pressure data from the left ventricle of the heart of a living swine. PMID:23559403

Murphy, Olive H; Bahmanyar, Mohammad Reza; Borghi, Alessandro; McLeod, Christopher N; Navaratnarajah, Manoraj; Yacoub, Magdi H; Toumazou, Christofer

2013-10-01

375

Flux composition, microstructure and mechanical properties of HY-100 SAW weldments  

SciTech Connect

The mechanical properties of submerged arc welds (SAW) on high strength steels are sensitive to weld-metal chemistry and thus the chemical composition of the welding consumables. Consumable chemistry determines the size, distribution, and composition of the nonmetallic inclusions present in the weld metal which together with cooling rate determines weld-metal microstructure and thus mechanical properties. Multirun submerged arc welds were made on HY-100 steel and all-weld variables were kept constant except the flux composition for which five different commercial fluxes were investigated. The basicity of each flux was calculated and correlated with weld-metal chemistry and it was found that lower basicity fluxes appeared to generate a higher oxygen activity in the weld-metal leading to more pronounced oxidation of carbon, manganese, and silicon and thus loss of weld-metal yield strength. Inclusion analyses showed the inclusion in the weld-metals to contain MnO, Al{sub 2}O{sub 3}, SiO{sub 2}, and TiO{sub 2}. These results suggest that the optimum flux for welding high-strength steels should have a high enough basicity and MnO content to avoid the loss of alloying elements from the weld metal due to high oxygen activity and to generate sufficient numbers of non-metallic inclusions to keep the DBTT low by forming significant amounts of acicular ferrite.

Brothers, D.G.; Kettell, K.W.; Fox, A.G. [and others

1994-12-31

376

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

377

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

378

The 2.2 GHz Surface Acoustic Wave (SAW) oscillator development Ku-band frequency source development  

NASA Technical Reports Server (NTRS)

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 band source; the second oscillator is available for continued evaluation. A 15 GHz frequency source was designed and fabricated. The 15 GHz source consists of a Ku band FET oscillator which is phase locked to the frequency multiplied (X7) output of the 2.2 GHz SAW reference source. The Ku band source was built using microstrip circuit designs, which are hybrid compatible. Two wafer runs of 2.2 GHz TED devices were fabricated and evaluated. The devices were mounted on microstrip test substrates and evaluated as 15 GHz divide by 7 circuits. The device evaluation indicated that in their present form the TED is not a practical circuit element.

1979-01-01

379

Lepton Flavor Violating $?$ Decays in TeV Scale Type I See-Saw and Higgs Triplet Models  

E-print Network

The lepton flavour violating (LFV) $\\tau$ decays $\\tau\\to (e,\\mu)\\gamma$ and $\\tau\\to 3\\mu$ are investigated in the frameworks of the TeV scale type I see-saw and Higgs Triplet (or type II see-saw) models. Predictions for the rates of these processes are obtained. The implications of the existing stringent experimental upper bounds on the $\\mu\\to e + \\gamma$ and $\\mu\\to 3e$ decay branching ratios for the predictions of the $\\tau\\to (e,\\mu)\\gamma$ and $\\tau\\to 3\\mu$ decay rates are studied in detail. The possibilities to observe the indicated LFV $\\tau$ decays in present and future experiments are analysed.

D. N. Dinh; S. T. Petcov

2013-08-19

380

Detection of coffee flavour ageing by solid-phase microextraction/surface acoustic wave sensor array technique (SPME/SAW).  

PubMed

The use of polymer coated surface acoustic wave (SAW) sensor arrays is a very promising technique for highly sensitive and selective detection of volatile organic compounds (VOCs). We present new developments to achieve a low cost sensor setup with a sampling method enabling the highly reproducible detection of volatiles even in the ppb range. Since the VOCs of coffee are well known by gas chromatography (GC) research studies, the new sensor array was tested for an easy assessable objective: coffee ageing during storage. As reference method these changes were traced with a standard GC/FID set-up, accompanied by sensory panellists. The evaluation of GC data showed a non-linear characteristic for single compound concentrations as well as for total peak area values, disabling prediction of the coffee age. In contrast, the new SAW sensor array demonstrates a linear dependency, i.e. being capable to show a dependency between volatile concentration and storage time. PMID:25624226

Barié, Nicole; Bücking, Mark; Stahl, Ullrich; Rapp, Michael

2015-06-01

381

INTERNATIONAL UNION OF OPERATING ENGINEERS NATIONAL HAZMAT PROGRAM - EVOLUTION 180 CIRCULAR SAW OENHP: 2001-03, 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 gloveboxes at the Department of Energy's (DOE) Los Alamos facility. The Evolution 180 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 Evolution 180 is a portable, metal cutting circular saw with a 7-inch diameter blade. The blade is contained within the main housing and has a retractable lower blade guard to prevent operator access to the blade during operation and shutdown. The saw is equipped with a chip collector. The maximum cutting thickness for metal is one-quarter inch and can cut steel tubing and pipe 2 inches in diameter. The unit is operated with an on/off guarded trigger switch and is supported with the hand guide mounted to the side of the saw. An adjustable lever sets the depth of the cut. The machine's circuitry will automatically shut the saw motor off if excessive overload is detected during operation. The one-half hour demonstration involved vertical and horizontal cuts and blade changes. During this process, operators experienced binding of the saw. This caused the blade to become hot, causing the sawdust collected in the chip collector to smoke. Care should be exercised to use the appropriate blade for the application, operator training, and personal protective equipment (PPE). Personal noise sampling indicated that neither worker was over the Occupational Safety and Health Administration's (OSHA) Action Level of 85 decibels (dBA) with time-weighted averages (TWA's) of 69.1 and 68.8 dBA. The personal noise sample taken during the special demonstration with the stainless steel plate had a TWA of 69.8 dBA. These data are not entirely representative as they were gathered during a simulation and not at the actual worksite. Additional sampling should be conducted on-site, but the workers should wear hearing protection until it is determined that it is no longer necessary. The total nuisance dust sample for the Evolution 180 circular saw was 3.5 milligrams per cubic meter (mg/m{sup 3}), which is lower than the OSHA Permissible Exposure Limit (PEL) of 15 mg/m{sup 3} and the American Conference of Governmental Industrial Hygienists' (ACGIH) Threshold Limit Value (TLV) of 10 mg/m{sup 3}. The fiber analysis yielded 1.74 fibers per cubic centimeter (f/cc), which is above the PEL of 1 f/cc. Although the nuisance dust levels were low, fiberglass dust levels were higher than the PEL. Since fiberglass dust is known to be a strong skin irritant and a possible human carcinogen, the workers should continue to wear appropriate suits and gloves, as well as a full-face air-purifying respirator. The respirator should be equipped with a combination organic vapor and acid gas cartridge in combination with a High Particulate Air (HEPA) filter, since particulate filter, since during the demonstration, the workers complained of an odd smell, which may have been from the breakdown of the fiberglass.

Unknown

2002-01-25

382

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

383

Evaluation of Cut-Off Saw Exposure Control Methods for Respirable Dust and Crystalline Silica in Roadway Construction  

Microsoft Academic Search

Dust reduction equipment adapted for single-person operation was evaluated for gas-powered, commercially available cut-off saws during concrete curb cutting. Cutting was performed without dust control and with two individual exposure control methods: wet suppression and local exhaust ventilation (LEV). The wet suppression system comprised a two-nozzle spray system and a 13.3-L hand-pressurized water supply system with an optimum mean flow

Beauregard Middaugh; Bryan Hubbard; Neil Zimmerman; James McGlothlin

2012-01-01

384

A New Hyphenated ? Trap—GC—Surface Acoustic Wave (SAW) Based Electronic Nose For Monitoring Of Coffee Quality  

NASA Astrophysics Data System (ADS)

An easy-to-use and versatile analytical method for complex matrix analisis like coffee was developed. The system consists of a microtrap sample preparation, a home made simplified gaschomatographic separation unit and an 8-fold surface acoustic wave based sensors (SAW) array detector. For the coffee quality analysis a successful discrimination of three coffee samples could be achieved. The system would be further developed into a fully automated, low cost version that can be broadly used by the coffee producers.

Carvalho, Mauro; Voigt, Achim; Rapp, Michael

2009-05-01

385

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

386

Extensive clonal spread and extreme longevity in saw palmetto, a foundation clonal plant.  

PubMed

The lack of effective tools has hampered out ability to assess the size, growth and ages of clonal plants. With Serenoa repens (saw palmetto) as a model, we introduce a novel analytical framework that integrates DNA fingerprinting and mathematical modelling to simulate growth and estimate ages of clonal plants. We also demonstrate the application of such life-history information of clonal plants to provide insight into management plans. Serenoa is an ecologically important foundation species in many Southeastern United States ecosystems; yet, many land managers consider Serenoa a troublesome invasive plant. Accordingly, management plans have been developed to reduce or eliminate Serenoa with little understanding of its life history. Using Amplified Fragment Length Polymorphisms, we genotyped 263 Serenoa and 134 Sabal etonia (a sympatric non-clonal palmetto) samples collected from a 20 × 20 m study plot in Florida scrub. Sabal samples were used to assign small field-unidentifiable palmettos to Serenoa or Sabal and also as a negative control for clone detection. We then mathematically modelled clonal networks to estimate genet ages. Our results suggest that Serenoa predominantly propagate via vegetative sprouts and 10,000-year-old genets may be common, while showing no evidence of clone formation by Sabal. The results of this and our previous studies suggest that: (i) Serenoa has been part of scrub associations for thousands of years, (ii) Serenoa invasion are unlikely and (ii) once Serenoa is eliminated from local communities, its restoration will be difficult. Reevaluation of the current management tools and plans is an urgent task. PMID:21848843

Takahashi, Mizuki K; Horner, Liana M; Kubota, Toshiro; Keller, Nathan A; Abrahamson, Warren G

2011-09-01

387

See-saw rocking: an in vitro model for mechanotransduction research.  

PubMed

In vitro mechanotransduction studies, uncovering the basic science of the response of cells to mechanical forces, are essential for progress in tissue engineering and its clinical application. Many varying investigations have described a multitude of cell responses; however, as the precise nature and magnitude of the stresses applied are infrequently reported and rarely validated, the experiments are often not comparable, limiting research progress. This paper provides physical and biological validation of a widely available fluid stimulation device, a see-saw rocker, as an in vitro model for cyclic fluid shear stress mechanotransduction. This allows linkage between precisely characterized stimuli and cell monolayer response in a convenient six-well plate format. Models of one well were discretized and analysed extensively using computational fluid dynamics to generate convergent, stable and consistent predictions of the cyclic fluid velocity vectors at a rocking frequency of 0.5 Hz, accounting for the free surface. Validation was provided by comparison with flow velocities measured experimentally using particle image velocimetry. Qualitative flow behaviour was matched and quantitative analysis showed agreement at representative locations and time points. Maximum shear stress of 0.22 Pa was estimated near the well edge, and time-average shear stress ranged between 0.029 and 0.068 Pa. Human tenocytes stimulated using the system showed significant increases in collagen and GAG secretion at 2 and 7 day time points. This in vitro model for mechanotransduction provides a versatile, flexible and inexpensive method for the fluid shear stress impact on biological cells to be studied. PMID:24898022

Tucker, R P; Henningsson, P; Franklin, S L; Chen, D; Ventikos, Y; Bomphrey, R J; Thompson, M S

2014-08-01

388

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

389

Full lineup serves wide variety of processing needs DAD3220, 3230 or 3430 is a one-axis dicing saw for 6-inch (6-inch square)  

E-print Network

. DAD3220 DAD3230/DAD3430 DAD Automatic Dicing Saw 3220 3230 3430 Compact dicing saw lineup for 6 ·Withafootprintapproximately14%smallerthanthatof predecessor DAD321, DAD3220 is extremely compact. ·DAD3230 features.5 at 0.3 MPa Exhaust duct capacity m3 /min 1.5 2.5 Machine dimensions (WxDxH) mm 500 x 900 x 1,670 730 x

390

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

391

Local heat transfer distribution in a square channel with 90 continuous, 90 saw tooth profiled and 60 broken ribs  

SciTech Connect

Internal channel cooling is employed in advanced gas turbines blade to allow high inlet temperatures so as to achieve high thrust/weight ratios and low specific fuel consumption. The objective of the present study is to measure the local heat transfer distributions in a double wall ribbed square channel with 90 continuous, 90 saw tooth profiled and 60 V-broken ribs. Comparison is made between the 90 continuous ribs (P/e = 7 and 10 for a e/D = 0.15) and 90 saw tooth profiled rib configurations (P/e = 7 for an e/D = 0.15) for the same rib height to the hydraulic diameter ratio (e/D). The effect of pitch to rib height ratio (P/e = 7.5,10 and 12) of 60 V-broken ribbed channel with a constant rib height to hydraulic diameter ratio (e/D) of 0.0625 on the local heat transfer distribution is studied. The Reynolds number based on duct hydraulic diameter is ranging from 10,000 to 30,000. A thin stainless steel foil of 0.05 mm thickness is used as heater and infrared thermography technique is used to obtain the local temperature distribution on the surface. The images are captured in the periodically fully developed region of the channel. It is observed that the heat transfer augmentations in the channel with 90 saw tooth profiled ribs are comparable with those of 90 continuous ribs. The enhancements caused by 60 V-broken ribs are higher than those of 90 continuous ribs. The effect of pitch to the rib height ratio (P/e) is not significant for channel with 60 V-broken ribs for a given rib height to hydraulic diameter ratio (e/D = 0.0625). (author)

Gupta, Abhishek; SriHarsha, V.; Prabhu, S.V.; Vedula, R.P. [Department of Mechanical Engineering, IIT Bombay, Powai, Mumbai 400 076 (India)

2008-02-15

392

A solution to reducing insertion loss and achieving high sidelobe rejection for wavelet transform and reconstruction processor using SAW devices  

NASA Astrophysics Data System (ADS)

An arbitrary wavelet transform and reconstruction processor is composed of multiple single-scale wavelet transform devices (SSWTDs) with different scales. For improving the performance of the processor using surface acoustic wave (SAW) devices, this research investigates how to reduce the insertion loss (IL) and achieve a high sidelobe rejection. To reduce the triple transit echo (TTE) and to achieve a high signal-noise ratio (SNR), the structure of the SSWTD consists of two electrode-widths-controlled (EWC) single phase unidirectional transducers (SPUDTs). In the propagation process of the SAW, the unidirectional characteristic of the new structure reduces the bidirectional loss of the entire device. In addition, to enlarge the fractional bandwidth and the sidelobe rejection, the internal structure of the SSWTD uses an input apodized transducer according to the envelope of the Morlet wavelet function as well as an output withdrawal weighting transducer. In this paper, we present a SSWTD for scale 2-2 as an example to illustrate the design method and experimental results. The new device is fabricated on 128° rotated YX-cut lithium niobate (Y128°X-LiNbO3) with the electromechanical coupling coefficient k2 = 5.5% and the SAW velocity 3992 m/s. We get the experimental frequency response with the center frequency 68.14 MHz, the minimum IL -9.96 dB, the fractional bandwidth 3.3%, the maximum passband ripples 0.4 dB and the sidelobe rejection greater than 40 dB. The proposed method and structure can be extended to an arbitrary SSWTD. The experimental results confirm that the performance of the wavelet transform and reconstruction processor can be improved by the proposed solution.

Jiang, Hua; Lu, Wenke; Zhang, Guoan; Xie, Zhengguang

2013-02-01

393

Dynamics of vegetation and soils of oak/saw palmetto scrub after fire: Observations from permanent transects  

NASA Technical Reports Server (NTRS)

Ten permanent 15 m transects previously established in two oak/saw palmetto scrub stands burned in December 1986, while two transects remained unburned. Vegetation in the greater than 0.5 m and the less than 0.5 m layers on these transects was sampled at 6, 12, 18, 24, and 36 months postburn and determined structural features of the vegetation (height, percent bare ground, total cover). The vegetation data were analyzed from each sampling by height layer using detrended correspondence analysis ordination. Vegetation data for the greater than 0.5 m layer for the entire time sequence were combined and analyzed using detrended correspondence analysis ordination. Soils were sampled at 6, 12, 18, and 24 months postburn and analyzed for pH, conductivity, organic matter, exchangeable cations (Ca, Mg, K, Na), NO3-N, NH4-N, Al, available metals (Cu, Fe, Mn, Zn), and PO4-P. Shrub species recovered at different rates postfire with saw palmetto reestablishing cover greater than 0.5 m within one year, but the scrub oaks had not returned to preburn cover greater than 0.5 m in 3 years after the fire. These differences in growth rates resulted in dominance shifts after the fire with saw palmetto increasing relative to the scrub oaks. Overall changes in species richness were minor, although changes occurred in species richness by height layers due to different growth rates. Soils of well drained and poorly drained sites differed markedly. Soil responses to the fire appeared minor. Soil pH increased at 6 and 12 months postfire; calcium increased at 6 months postburn. Nitrate-nitrogen increased at 12 months postburn. Low values of conductivity, PO4-P, Mg, K, Na, and Fe at 12 months postburn may be related to heavy rainfall the preceding month. Seasonal variability in some soil parameters appeared to occur.

Schmalzer, Paul A.; Hinkle, G. Ross

1991-01-01

394

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

395

INTERNATIONAL UNION OF OPERATING ENGINEERS NATIONAL HAZMAT PROGRAM - MILWAUKEE WORM DRIVE CIRCULAR SAW OENHP{number_sign}: 2001-02, 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 Milwaukee worm drive 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 Milwaukee worm drive circular saw is a hand-held tool with a 7 1/4-inch diameter circular blade for cutting wood. The saw contains a fixed upper and a retractable lower blade guard to prevent access to the blade during use. The unit is operated with an on/off guarded trigger switch; and is supported with a handgrip mounted on top of the saw. An adjustable lever sets the depth of cut. The retractable blade guard permits blind or plunge cuts and protects from blade access during shutdown and blade coast. Kickback, the sudden reaction to a pinched blade, is possible when using this saw and could cause the saw to lift up and out of the work piece toward the operator. Proper work position and firm control of the saw minimizes the potential for a sprain or strain. Care needs to be exercised to support the work piece properly and to not force the tool. Personal noise sampling indicated that one worker was near the Occupational Safety and Health Administration's (OSHA) Action Level of 85 decibels (dBA) while the other was at the Action Level with time-weighted averages (TWA's) of 82.7 and 84.6 dBA, respectively. These data are not entirely representative as they were gathered during a simulation and not at the actual worksite. Additional sampling should be conducted on-site, but the workers should wear hearing protection until it is determined that it is no longer necessary. Air sampling was performed while the workers dismantled the fiberglass-reinforced crates. The total nuisance dust sample for the Milwaukee circular saw was 36.07 milligrams per cubic meter (mg/m{sup 3}), which is much higher than the OSHA Permissible Exposure Limit (PEL) of 15 mg/m{sup 3} and the American Conference of Governmental Industrial Hygienists' (ACGIH) Threshold Limit Value (TLV) of 10 mg/m{sup 3}. Galson Laboratories considered the fiber analysis void due to the overloading of the filter. The PEL for fiberglass is 1 fiber per cubic centimeter (f/cc).

Unknown

2002-01-05

396

Constructing the large mixing angle MNS matrix in see-saw models with right-handed neutrino dominance  

NASA Astrophysics Data System (ADS)

Recent SNO results strongly favour the large mixing angle (LMA) MSW solar solution. We argue that there are only two technically natural low energy neutrino mass matrix structures consistent with the LMA MSW solution, corresponding to either a hierarchy or an inverted hierarchy with pseudo-Dirac neutrinos. We construct the MNS matrix to leading order in the small angle ?13 including the neutrino and charged lepton mixing angles and phases, the latter playing a crucial rôle for allowing the inverted hierarchy case to be consistent with the LMA MSW solution. We then consider the see-saw mechanism with right-handed neutrino dominance and show how the successful neutrino mass matrix structures may be constructed with no tuning and with small radiative corrections, leading to a full, partial or inverted neutrino mass hierarchy. In each case we derive approximate analytic relations between the input see-saw parameters and the resulting neutrino masses, mixing angles and phases, which will provide a useful guide for unified model building. For the hierarchical cases the LMA MSW solution gives a soft lower bound |Ue3| gtrsim 0.1, just below the current CHOOZ limit. Both hierarchical and inverted hierarchical cases predict small ??0? with |mee| ~ 0.007 eV within the sensitivity of future proposals such as GENIUS. Successful leptogenesis is possible if the dominant right-handed neutrino is the heaviest one, but the leptogenesis phase is unrelated to the MNS phases.

King, Stephen F.

2002-09-01

397

Constructing the large mixing angle MNS matrix in see-saw models with right-handed neutrino dominance  

E-print Network

Recent SNO results strongly favour the large mixing angle (LMA) MSW solar solution. We argue that there are only two technically natural low energy neutrino mass matrix structures consistent with the LMA MSW solution, corresponding to either a hierarchy or an inverted hierarchy with pseudo-Dirac neutrinos. We first present a model-independent analysis in which we diagonalise each of these two mass matrix structures to leading order in $\\theta_{13}$ and extract the neutrino masses, mixing angles and phases. In this analysis we express the MNS matrix to leading order in the small angle $\\theta_{13}$ including the neutrino {\\em and} charged lepton mixing angles and phases, the latter playing a crucial r\\^{o}le for allowing the inverted hierarchy case to be consistent with the LMA MSW solution. We then consider the see-saw mechanism with right-handed neutrino dominance and show how the successful neutrino mass matrix structures may be constructed with no tuning and with small radiative corrections, leading to a full, partial or inverted neutrino mass hierarchy. In each case we derive approximate analytic relations between the input see-saw parameters and the resulting neutrino masses, mixing angles and phases, which will provide a useful guide for unified model building. For the hierarchical cases the LMA MSW solution gives a soft lower bound $|U_{e3}|\\simgt 0.1$, just below the current CHOOZ limit. Both hierarchical and inverted hierarchical cases predict small $\\beta \\beta_{0\

S. F. King

2002-04-30

398

From Hierarchical to Partially Degenerate Neutrinos via Type II Upgrade of Type I See-Saw Models  

E-print Network

We propose a type II upgrade of type I see-saw models leading to new classes of models where partially degenerate neutrinos are as natural as hierarchical ones. The additional type II contribution to the neutrino mass matrix, which determines the neutrino mass scale, is forced to be proportional to the unit matrix by a SO(3) flavour symmetry. The type I see-saw part of the neutrino mass matrix, which controls the mass squared differences and mixing angles, may be governed by sequential right-handed neutrino dominance and a natural alignment for the SO(3)-breaking vacuum. We focus on classes of models with bi-large mixing originating from the neutrino mass matrix although we also briefly discuss other classes of models where large mixing stems from the charged lepton mass matrix. We study renormalization group corrections to the neutrino mass squared differences and mixings and find that the low energy values do not depend sensitively on the high energy values for partially degenerate neutrinos with a mass scale up to about 0.15 eV. Our scenario predicts the effective mass for neutrinoless double beta decay to be approximately equal to the neutrino mass scale and therefore neutrinoless double beta decay will be observable if the neutrino mass spectrum is partially degenerate. We also find that all observable CP phases as well as $\\theta_{13}$ become small as the neutrino mass scale increases.

Stefan Antusch; Steve F. King

2004-02-11

399

Constraints on the rare tau decays from mu --> e gamma in the supersymmetric see-saw model  

E-print Network

It is now a firmly established fact that all family lepton numbers are violated in Nature. In this paper we discuss the implications of this observation for future searches for rare tau decays in the supersymmetric see-saw model. Using the two loop renormalization group evolution of the soft terms and the Yukawa couplings we show that there exists a lower bound on the rate of the rare process mu --> e gamma of the form BR(mu --> e gamma) > C BR(tau --> mu gamma) BR(tau --> e gamma), where C is a constant that depends on supersymmetric parameters. Our only assumption is the absence of cancellations among the high-energy see-saw parameters. We also discuss the implications of this bound for future searches for rare tau decays. In particular, for large regions of the mSUGRA parameter space, we show that present B-factories could discover either tau --> mu gamma or tau --> e gamma, but not both.

Alejandro Ibarra; Cristoforo Simonetto

2008-02-26

400

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

401

Rectified Cell Migration on Saw-Like Micro-Elastically Patterned Hydrogels with Asymmetric Gradient Ratchet Teeth  

PubMed Central

To control cell motility is one of the essential technologies for biomedical engineering. To establish a methodology of the surface design of elastic substrate to control the long-range cell movements, here we report a sophisticated cell culture hydrogel with a micro-elastically patterned surface that allows long-range durotaxis. This hydrogel has a saw-like pattern with asymmetric gradient ratchet teeth, and rectifies random cell movements. Durotaxis only occurs at boundaries in which the gradient strength of elasticity is above a threshold level. Consequently, in gels with unit teeth patterns, durotaxis should only occur at the sides of the teeth in which the gradient strength of elasticity is above this threshold level. Therefore, such gels are expected to support the long-range biased movement of cells via a mechanism similar to the Feynman-Smoluchowski ratchet, i.e., rectified cell migration. The present study verifies this working hypothesis by using photolithographic microelasticity patterning of photocurable gelatin gels. Gels in which each teeth unit was 100–120 µm wide with a ratio of ascending:descending elasticity gradient of 1:2 and a peak elasticity of ca. 100 kPa supported the efficient rectified migration of 3T3 fibroblast cells. In addition, long-range cell migration was most efficient when soft lanes were introduced perpendicular to the saw-like patterns. This study demonstrates that asymmetric elasticity gradient patterning of cell culture gels is a versatile means of manipulating cell motility. PMID:24147112

Kidoaki, Satoru; Sakashita, Hiroyuki

2013-01-01

402

Development of Methods of Producing Large Areas of Silicon Sheet by the Slicing of Silicon Ingots Using Inside Diameter (I.D.) Saws  

NASA Technical Reports Server (NTRS)

Methods of producing large areas of silicon sheets were developed by using inside diameter (I.D.) saws to slice silicon ingots. A 16 inch automated I.D. slicing machine was modified to accept programmable electric feed system, a crystal rotating system and a dyna-track blade monitoring and control system. The saw and accessories were used to slice 75 mm diameter single crystal silicon ingots while rotating them. The automated saw automatically recovered the wafers and loaded them into a cassette. The amount of material lost during slicing was reduced by using smaller blades than ones normally used to slice the wafers. Slicing runs on 100 mm diameter silicon is the next goal.

Aharonyan, P.

1979-01-01

403

Implementation of wireless battery-free microgyrosensor by utilizing one-port SAW delay line and an antenna with double resonant frequencies  

NASA Astrophysics Data System (ADS)

A wireless, battery-free gyroscope was developed by employing a one-port surface acoustic wave (SAW) reflective delay line, a SAW resonator, and an antenna. Two SAW devices with different center frequencies were simultaneously activated by one antenna with double resonant frequencies. During wireless testing, the developed gyroscope showed clear reflection peaks with high S/N ratios in both the time and frequency domains. Upon rotation of the device, large shifts of the reflection peaks were observed owing to a secondary wave interference effect caused by the Coriolis force that depends on the spinning rate. The measured sensitivity and linearity of the developed gyroscope were, respectively, 1.35 deg/(deg/s) and 0.91, which are promising values for our targeted applications. The temperature and vibration/shock effects were also characterized

Fu, C.; Elmarzia, O.; Lee, K.

2014-03-01

404

Enhancing chemical identification efficiency by SAW sensor transients through a data enrichment and information fusion strategy—a simulation study  

NASA Astrophysics Data System (ADS)

The paper proposes a new approach for improving the odor recognition efficiency of a surface acoustic wave (SAW) transient sensor system based on a single polymer coating. The vapor identity information is hidden in transient response shapes through dependences on specific vapor solvation and diffusion parameters in the polymer coating. The variations in the vapor exposure and purge durations and the sensor operating frequency have been used to create diversity in transient shapes via termination of the vapor-polymer equilibration process up to different stages. The transient signals were analyzed by the discrete wavelet transform using Daubechies-4 mother wavelet basis. The wavelet approximation coefficients were then processed by principal component analysis for creating feature space. The set of principal components define the vapor identity information. In an attempt to enhance vapor class separability we analyze two types of information fusion methods. In one, the sensor operation frequency is fixed and the sensing and purge durations are varied, and in the second, the sensing and purge durations are fixed and the sensor operating frequency is varied. The fusion is achieved by concatenation of discrete wavelet coefficients corresponding to various transients prior to the principal component analysis. The simulation experiments with polyisobutylene SAW sensor coating for operation frequencies over [55-160] MHz and sensing durations over [5-60] s were analyzed. The target vapors are seven volatile organics: chloroform, chlorobenzene, o-dichlorobenzene, n-heptane, toluene, n-hexane and n-octane whose concentrations were varied over [10-100] ppm. The simulation data were generated using a SAW sensor transient response model that incorporates the viscoelastic effects due to polymer coating and an additive noise source in the output. The analysis reveals that: (i) in single transient analysis the class separability increases with sensing duration for a given frequency of operation, and also with frequency for a given sensing duration, and (ii) the information fusion based on both the multiple sensing cycles and the multiple sensing frequencies enhances the class separability by nearly an order of magnitude.

Singh, Prashant; Yadava, R. D. S.

2013-05-01

405

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

406

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

407

Staircase and saw-tooth field emission steps from nanopatterned n-type GaSb surfaces  

SciTech Connect

High resolution field emission experiments from nanopatterned GaSb surfaces consisting of densely packed nanocones prepared by low ion-beam-energy sputtering are presented. Both uncovered and metal-covered nanopatterned surfaces were studied. Surprisingly, the field emission takes place by regular steps in the field emitted current. Depending on the field, the steps are either regular, flat, plateaus, or saw-tooth shaped. To the author's knowledge, this is the first time that such results have been reported. Each discrete jump in the field emission may be understood in terms of resonant tunneling through an extended surface space charge region in an n-type, high aspect ratio, single GaSb nanocone. The staircase shape may be understood from the spatial distribution of the aspect ratio of the cones.

Kildemo, M.; Levinsen, Y. Inntjore; Le Roy, S.; Soenderga ring rd, E. [Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondlieim (Norway); Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondlieim, Norway and AB CERN, CH- 1211 Geneva 23 (Switzerland); Laboratoire Surface du Verre et Interfaces, UMR 125 Unite Mixte de Recherche CNRS/Saint-Gobain Laboratoire, 39 Quai Lucien Lefranc, F-93303 Aubervilliers Cedex (France)

2009-09-15

408

Evaluation of cut-off saw exposure control methods for respirable dust and crystalline silica in roadway construction.  

PubMed

Dust reduction equipment adapted for single-person operation was evaluated for gas-powered, commercially available cut-off saws during concrete curb cutting. Cutting was performed without dust control and with two individual exposure control methods: wet suppression and local exhaust ventilation (LEV). The wet suppression system comprised a two-nozzle spray system and a 13.3-L hand-pressurized water supply system with an optimum mean flow rate of 0.83 L/min for 16 min of cutting. The LEV system consisted of a spring-loaded guard, an 18.9-L collection bag, and a centrifugal fan with an estimated exhaust rate of 91 ft(3)/min. Task-based, personal filter samples were obtained for four saw operators during cutting durations of 4 to 16 min on five job sites. Seventeen filter samples were collected without dust control, 14 with wet suppression, and 12 with LEV, yielding a geometric mean respirable dust concentration of 16.4 mg/m(3), 3.60 mg/m(3), and 4.40 mg/m(3), respectively. A dust reduction of 78.0% for wet suppression and 73.2% for LEV was observed vs. no dust control. A statistically significant difference (p < 0.001) was also revealed for wet suppression and LEV when compared with no dust control; however, a significant difference (p = 0.09) was not observed between wet suppression and LEV. Despite these significant dust reductions, workers are still projected to exceed the ACGIH 8-hr time-weighted average threshold limit value for quartz (0.025 mg/m(3)) in less than 1 hr of cutting for both dust control methods. Further research is still needed to improve dust reduction and portability of both control methods, but the current LEV system offers important advantages, including a drier, less slippery work area and year-round functionality in cold weather. PMID:22394370

Middaugh, Beauregard; Hubbard, Bryan; Zimmerman, Neil; McGlothlin, James

2012-01-01

409

Evaluation of surgically assisted rapid maxillary expansion with piezosurgery versus oscillating saw and chisel osteotomy - a randomized prospective trial  

PubMed Central

Background Ultrasonic bone-cutting surgery has been introduced as a feasible alternative to the conventional sharp instruments used in craniomaxillofacial surgery because of its precision and safety. The piezosurgery medical device allows the efficient cutting of mineralized tissues with minimal trauma to soft tissues. Piezoelectric osteotome has found its role in surgically assisted rapid maxillary expansion (SARME), a procedure well established to correct transverse maxillary discrepancies. The advantages include minimal risk to critical anatomic structures. The purpose of this clinical comparative study (CIS 2007-237-M) was to present the advantages of the piezoelectric cut as a minimally invasive device in surgically assisted, rapid maxillary expansion by protecting the maxillary sinus mucosal lining. Methods Thirty patients (18 females and 12 males) at the age of 18 to 54 underwent a surgically assisted palatal expansion of the maxilla with a combined orthodontic and surgical approach. The patients were randomly divided into two separate treatment groups. While Group 1 received conventional surgery using an oscillating saw, Group 2 was treated with piezosurgery. The following parameters were examined: blood pressure, blood values, required medication, bleeding level in the maxillary sinus, duration of inpatient stay, duration of surgery and height of body temperature. Results The results displayed no statistically significant differences between the two groups regarding laboratory blood values and inpatient stay. The duration of surgery revealed a significant discrepancy. Deploying piezosurgery took the surgeon an average of 10 minutes longer than working with a conventional-saw technique. However, the observation of the bleeding level in the paranasal sinus presented a major and statistically significant advantage of piezosurgery: on average the bleeding level was one category above the one of the remaining patients. Conclusion This method of piezoelectric surgery with all its advantages is going to replace many conventional operating procedures in oral and maxillofacial surgery. Trial registration CIS 2007-237-M PMID:23414112

2013-01-01

410

TeV Scale See-Saw Mechanisms of Neutrino Mass Generation, the Majorana Nature of the Heavy Singlet Neutrinos and $\\betabeta$-Decay  

E-print Network

It is shown that the Majorana nature of the heavy neutrinos $N_j$ having masses in the range of $M_j \\sim (100 - 1000)$ GeV and present in the TeV scale type I and inverse see-saw scenarios of neutrino mass generation, is unlikely to be observable in the currently operating and future planned accelerator experiments (including LHC) due to the existence of very strong constraints on the parameters and couplings responsible for the corresponding $|\\Delta L| = 2$ processes, $L$ being the total lepton charge. If the heavy Majorana neutrinos $N_j$ are observed and they are associated only with the type I or inverse see-saw mechanisms and no additional TeV scale "new physics", they will behave like Dirac fermions to a relatively high level of precision, being actually pseudo-Dirac particles. The observation of effects proving the Majorana nature of $N_j$ would imply that these heavy neutrinos have additional relatively strong couplings to the Standard Model particles (as, e.g. in the type III see-saw scenario), or that light neutrino masses compatible with the observations are generated by a mechanism other than see-saw (e.g., radiatively at one or two loop level) in which the heavy Majorana neutrinos $N_j$ are nevertheless involved.

A. Ibarra; E. Molinaro; S. T. Petcov

2010-07-14

411

How the Inverse See-Saw Mechanism Can Reveal Itself Natural, Canonical and Independent of the Right-Handed Neutrino Mass  

E-print Network

The common lore in the literature of neutrino mass generation is that the canonical see-saw mechanism beautifully offers an explanation for the tiny neutrino mass but at the cost of introducing right-handed neutrinos at a scale that is out of range for the current experiments. The inverse see-saw mechanism is an interesting alternative to the canonical one once it leads to tiny neutrino masses with the advantage of being testable at TeV scale. However, this last mechanism suffers from an issue of naturalness concerning the scale responsible for such small masses, namely, the parameter $\\mu$ that is related to lepton number violation and is supposed to be at the keV scale, much lower than the electroweak one. However, no theoretical framework was built that offers an explanation for obtaining this specific scale. In this work we propose a variation of the inverse see-saw mechanism by assuming a minimal scalar and fermionic set of singlet fields, along with a $Z_5\\otimes Z_2$ symmetry, that allows a dynamical explanation for the smallness of $\\mu$, recovering the neat canonical see-saw formula and with right-handed (RH) neutrinos free to be at the electroweak scale, thus testable at LHC and current neutrino experiments.

A. G. Dias; C. A. de S. Pires; P. S. Rodrigues da Silva

2011-07-04

412

Muscle activity and spine load during anterior chain whole body linkage exercises: the body saw, hanging leg raise and walkout from a push-up.  

PubMed

Abstract This study examined anterior chain whole body linkage exercises, namely the body saw, hanging leg raise and walkout from a push-up. Investigation of these exercises focused on which particular muscles were challenged and the magnitude of the resulting spine load. Fourteen males performed the exercises while muscle activity, external force and 3D body segment motion were recorded. A sophisticated and anatomically detailed 3D model used muscle activity and body segment kinematics to estimate muscle force, and thus sensitivity to each individual's choice of motor control for each task. Gradations of muscle activity and spine load characteristics were observed across tasks. On average, the hanging straight leg raise created approximately 3000 N of spine compression while the body saw created less than 2500 N. The hanging straight leg raise created the highest challenge to the abdominal wall (>130% MVC in rectus abdominis, 88% MVC in external oblique). The body saw resulted in almost 140% MVC activation of the serratus anterior. All other exercises produced substantial abdominal challenge, although the body saw did so in the most spine conserving way. These findings, along with consideration of an individual's injury history, training goals and current fitness level, should assist in exercise choice and programme design. PMID:25111163

McGill, Stuart; Andersen, Jordan; Cannon, Jordan

2015-02-01

413

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

414

21Volume 1:1 Spring 2008 Fungi We saw an upsurge in the number of articles on big broad fungal  

E-print Network

21Volume 1:1 Spring 2008 Fungi We saw an upsurge in the number of articles on big broad fungal universities who collaborated to give an overall picture of the origins and evolution of the fungi, based a complete overview of the kingdom Fungi and show a reno- vated landscape.The new layout is especially

California at Berkeley, University of

415

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

416

Detection of cellular damage by hydrogen peroxide using SV40-T2 cells on shear horizontal surface acoustic wave (SH-SAW) sensor.  

PubMed

The rat lung epithelial cell line SV40-T2 was used to develop a cellular biosensing system to assay for environmental toxicants. The novel approach on which this system is based involves direct attachment of cultured rat or human cells onto a cell-adhesive matrix on the device through which shear horizontal surface acoustic waves (SH-SAW) are transmitted using 50 MHz SAW resonator. This novel design enables sensitive monitoring of changes of the electrophysical characteristics of cells, such as their conductivity and relative permittivity. A time-dependent change of phase of SAW and change of insertion loss (change of amplitude) were observed when the cells were treated with 0.5 or 1.0 mM H2O2. The change of insertion loss was biphasic, with an early phase (1-3 h) and a late phase (3-6 h). The late phase coincided with the destruction of cell-cell tight junctions detected by measurement of the transepithelial electrical resistance and paracellular permeability; in contrast, the early phase coincided with the destruction of intracellular actin filaments by H2O2. The early-phase effect of H2O2 on phase shift may be attributable to the change of intracellular permittivity by a change of cellular polarity. Immunofluorescence microscopy showed the disappearance of zonula occludens protein 1 from the region of cell-cell contact. These results suggest the correlation between the change of insertion loss as an SAW parameter and the destruction of tight junctions of the cells on the SH-SAW device in the late phase. PMID:24835005

Higashiyama, Takumi; Katsuyama, Akihiro; Otori, Hideki; Kamimura, Toru; Uehara, Atsushi; Kainuma, Miho; Takumi, Ryo; Kudo, Yukako; Ebina, Masayuki; Mochitate, Katsumi; Kon, Tasuku; Furuya, Yasubumi; Kikuchi, Hideaki

2014-08-01

417

Identification and Affinity-Quantification of ß-Amyloid and ?-Synuclein Polypeptides Using On-Line SAW-Biosensor-Mass Spectrometry  

NASA Astrophysics Data System (ADS)

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.

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

418

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

419

Neutrino masses, muon g-2, and lepton-flavour violation in the supersymmetric see-saw model  

E-print Network

In the light of the recent muon (g_mu-2) result by the E821 experiment at the Brookhaven National Laboratory, we study the event rates of the charged lepton-flavour-violating (LFV) processes in the supersymmetric standard model (SUSY SM) with the heavy right-handed neutrinos (SUSY see-saw model). Since the left-handed sleptons get the LFV masses via the neutrino Yukawa interaction in this model, the event rate of mu->e gamma and the SUSY-SM correction to (g_mu-2)/2 (\\delta a_mu^{SUSY}) are strongly correlated. When the left-handed sleptons have a LFV mass between the first and second generations ((m^2_L)_{12}) in the mass matrix, it should be suppressed by \\sim 10^{-3} ({10^-9}/\\delta a_mu^{SUSY}) compared with the diagonal components (m_{SUSY}^2), from the current experimental bound on mu-> e gamma. The recent (g_mu-2) result indicates {\\delta a_mu^{SUSY}}\\sim 10^{-9}. The future charged LFV experiments could cover (m^2_L)_{12}/m_{SUSY}^2\\gsim 10^{-(5-6)}. These experiments will give a significant impact on the flavour models and the SUSY-breaking models. In the SUSY see-saw model (m^2_L)_{12} is proportional to square of the tau-neutrino Yukawa-coupling constant. In the typical models where the neutrino-oscillation results are explained and the top-quark and tau-neutrino Yukawa couplings are unified at the GUT scale, a large LFV mass of (m^2_L)_{12}/m_{SUSY}^2\\gsim 10^{-4} is generated, and the large LFV event rates are predicted. We impose a so-called no-scale condition for the SUSY-breaking parameters at the GUT scale, which suppresses the FCNC processes, and derive the conservative lower bound on mu-> egamma. The predicted Br(mu-> e gamma) could be covered at the future LFV experiments.

Junji Hisano; Kazuhiro Tobe

2001-02-26

420

Fabrication of 0.25-um electrode width SAW filters using x-ray lithography with a laser plasma source  

NASA Astrophysics Data System (ADS)

A process for the fabrication of surface acoustic wave (SAW) devices with line widths of 250 nm and less, based on x-ray lithography using a laser-plasma source has been developed. The x-ray lithography process is based on keV x-ray emission from Cu plasma produced by 15 Hz, 50 ps, 248 nm KrF excimer laser pulses. The full structure of a 2 GHz surface acoustic wave filter with interdigital transducers in a split-electrode geometry has been manufactured. The devices require patterning a 150 nm thick aluminum layer on a LiNbO3 substrate with electrodes 250 nm wide. The manufacturing process has two main steps: x-ray mask fabrication employing e-beam lithography and x-ray lithography to obtain the final device. The x-ray masks are fabricated on 1 micrometers thick membranes of Si2N4. The line patterns on the masks are written into PMMA resist using a scanning electron microscope which has been interfaced to a personal computer equipped to control the x and y scan voltages. The opaque regions of the x-ray mask are then formed by electroplating fine grain gold into the open spaces in the etched PMMA. The mask and sample are mounted in an exposure cassette with a fixed spacer of 10 micrometers separating them. The sample consists of a LiNbO3 substrate coated with Shipley XP90104C x-ray resist which has been previously characterized. The x-ray patterning is carried out in an exposure chamber with flowing helium background gas in order to minimize debris deposition on the filters. After etching the x-ray resist, the final patterns are produced using metallization and a standard lift-off technique. The SAW filters are then bonded and packaged onto impedance matching striplines. The resultant devices are tested using Scalar Network Analyzers. The final devices produced had a center frequency of 1.93 GHz with a bandwidth of 98 MHz, close to the expected performance of our simple design.

Bobkowski, Romuald; Li, Yunlei; Fedosejevs, Robert; Broughton, James N.

1996-05-01

421

Numerical simulation of operation modes in atmospheric pressure uniform barrier discharge excited by a saw-tooth voltage  

SciTech Connect

The characteristics of dielectric barrier discharge excited by a saw-tooth voltage are simulated in atmospheric pressure helium based on a one-dimensional fluid model. A stepped discharge is obtained per half voltage cycle with gas gap width less than 2 mm by the simulation, which is different to the pulsed discharge excited by a sinusoidal voltage. For the stepped discharge, the plateau duration increases with increasing the voltage amplitude and decreasing the gas gap. Therefore, uniform discharge with high temporal duty ratio can be realized with small gap through increasing the voltage amplitude. The maximal densities of both electron and ion appear near the anode and the electric field is almost uniformly distributed along the gap, which indicates that the stepped discharge belongs to a Townsend mode. In contrast to the stepped discharge with small gas gap, a pulsed discharge can be obtained with large gas gap. Through analyzing the spatial density distributions of electron and ion and the electric field, the pulsed discharge is in a glow mode. The voltage-current (V-I) characteristics are analyzed for the above mentioned discharges under different gas gaps, from which the different discharge modes are verified.

Li Xuechen; Niu Dongying; Yin Zengqian [College of Physics Science and Technology, Hebei University, Baoding 071002 (China); Fang Tongzhen; Wang Long [Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

2012-08-15

422

Wear Performance of Saw Blades in Processing of Granitic Rocks and Development of Models for Wear Estimation  

NASA Astrophysics Data System (ADS)

This study investigates the wear performance of diamond circular saw blades in cutting of granitic rocks. An alternative wear measuring method is developed to measure the reduced blade radius without taking the blade off the machine. The effect on and contribution to the specific wear rate (SWR) of each operating variable are determined, and the SWR is correlated with rock properties. Morphologies of wearing surfaces of segments and rocks are also evaluated using scanning electron microscopy (SEM). Depending on both operating variables and rock properties, prediction models are developed for estimation of the SWR. Results show that the SWR increases with an increase in the peripheral speed and the traverse speed, while it decreases with an increase in the cutting depth and the flow rate of the cooling fluid. The peripheral speed, and the microhardness and proportions of minerals such as quartz, plagioclase, and feldspar are statistically determined as the significant variables affecting the SWR. Finally, it is disclosed that models developed for estimation of SWR have great potential for practical applications.

Aydin, Gokhan; Karakurt, Izzet; Aydiner, Kerim

2013-11-01

423

Development of Predictive Models for the Specific Energy of Circular Diamond Sawblades in the Sawing of Granitic Rocks  

NASA Astrophysics Data System (ADS)

This paper presents an experimental study on the sawing of granitic rocks by circular diamond sawblades. The influence of the operating variables and rock properties on the specific energy were initially investigated and analyzed. To determine the most significant operating variables and rock properties influencing the specific energy, statistical analyses were then employed and the models were built for the estimation of specific energy depending on the operating variables and the rock properties. Moreover, the derived models were validated through statistical tests such as the determination coefficient, t-test, F-test, and residuals. The results indicated that the specific energy decreased with the decreasing of peripheral speed and the increasing of traverse speed, cutting depth, and flow rate of cooling fluid, respectively. It was concluded that, rather than the physico-mechanical properties, the mineralogical properties were the dominant rock properties affecting the specific energy. Additionally, the peripheral speed was statistically determined as the most significant operating variable affecting the specific energy. The peripheral speed was followed by the cutting depth, traverse speed, and flow rate of cooling fluid with respect to their level of significance on the specific energy. Furthermore, the model results revealed that the developed models have high potentials as a guidance for practical applications.

Aydin, Gokhan; Karakurt, Izzet; Aydiner, Kerim

2013-07-01

424

A comparative study of the SSC resistance of a novel welding process IEA with SAW and MIG  

SciTech Connect

The Stress Sulphide Cracking resistance of X65 weldments produced by Indirect Electric Arc, Submerged Arc Welding (SAW) and Metal Inert Gas (MIG) processes were evaluated in a NACE solution saturated with H{sub 2}S at 25 deg. C, 37 deg. C and 50 deg. C using Slow Strain Rate Tests (SSRT) and electrochemical measurements. Weldments produced by the Indirect Electric Arc presented the best Stress Sulphide Cracking resistance at 25 deg. C. This behavior is attributed to the microstructural modification of the weld bead from ferrite in a needlelike form to a fine grain microstructure, which was not observed at 37 deg. C and 50 deg. C. In addition, the hydrogen permeation flux increased with the temperature, this result is associated with the ferrite phase. The electrochemical results show a decrease of the trapping sites for the atomic hydrogen on this weldment. This behavior has not been observed for the other welding processes due to their microstructure (a typical columnar growth of coarse grain)

Natividad, C. [Facultad de Quimica, UNAM Circuito interior, C.U., Edificio BC.P. 04510, Mexico, D.F (Mexico)]. E-mail: consnatividad@yahoo.com.mx; Salazar, M. [Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas 152, San Bartolo Atepehuacan, 07730, Mexico, D.F (Mexico)]. E-mail: salazarm@imp.mx; Espinosa-Medina, M.A. [Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas 152, San Bartolo Atepehuacan, 07730, Mexico, D.F (Mexico); Perez, R. [Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas 152, San Bartolo Atepehuacan, 07730, Mexico, D.F (Mexico)

2007-08-15

425

Numerical simulation of evaluation of surface breaking cracks by array-lasers generated narrow-band SAW  

NASA Astrophysics Data System (ADS)

Most of the factors limiting the extensive application of laser-based ultrasonic for nondestructive evaluation of surface breaking crack are its poor sensitivity, low efficiency relative to conventional contact ultrasonic methods and limit on the dimension of the cracks. For this reason, a new technique that multiplepulse narrow-band ultrasound generated by laser arrays has been proposed. It is found that crack detection dependent on spectrum of narrow-band ultrasound generated by laser arrays can be operated with low amplitude requirements. In this paper, the narrow-band ultrasound generated by pulse laser arrays interacting with surface breaking cracks has been simulated in detail by the finite element method (FEM) according to the thermoelastic theory. The pulsed array lasers were assumed to be transient heat source, and the surface acoustic wave (SAW) which propagating on the top of the plate was computed based on thermoelastic theory. Then the frequency spectrums of both reflected waves by crack and transmission ones through crack were compared with the direct waves. Results demonstrate that multiple-frequency components of the narrow-band ultrasound were varied with change of the depth of surface breaking cracks significantly, which provides the possibility for precise evaluation of surface breaking cracks.

Dong, Li-Ming; Ni, Chen-Yin; Shen, Zhong-Hua; Ni, Xiao-Wu

2011-09-01

426

TeV-scale bileptons, see-saw type II and lepton flavor violation in core-collapse supernova  

E-print Network

Electrons and electron neutrinos in the inner core of the core-collapse supernova are highly degenerate and therefore numerous during a few seconds of explosion. In contrast, leptons of other flavors are non-degenerate and therefore relatively scarce. This is due to lepton flavor conservation. If this conservation law is broken by some non-standard interactions, electron neutrinos are converted to muon and tau-neutrinos, and electrons - to muons. This affects the supernova dynamics and the supernova neutrino signal. We consider lepton flavor violating interactions mediated by scalar bileptons, i.e. heavy scalars with lepton number 2. It is shown that in case of TeV-mass bileptons the electron fermi gas is equilibrated with non-electron species inside the inner supernova core at a time-scale of order of (1-100) ms. In particular, a scalar triplet which generates neutrino masses through the see-saw type II mechanism is considered. It is found that supernova core is sensitive to yet unprobed values of masses and couplings of the triplet.

Oleg Lychkovskiy; Sergei Blinnikov; Mikhail Vysotsky

2010-03-15

427

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

428

Assessing the quality of x-ray optic surfaces of Si crystals cut by diamond-wire and rotating-blade sawing techniques.  

SciTech Connect

The next generation of X-ray diffraction optics will benefit from crystal surfaces with very high quality (extremely flat and strain-free), but knowledge on how to achieve such surfaces and how surface imperfections affect the diffraction properties is sparse in the literature. As a first step to initialize a systematic study on this topic, we evaluate in this paper the surface quality of two Si (111) wafers cut by a diamond-wire saw and a rotating blade saw, respectively. We concentrate on revealing lattice strains induced by the two cutting methods and on strain evolution during three rounds of chemical etching (without polishing). The measurements also provide some important clues as to how surface roughness affects rocking curve widths and other diffraction properties.

Wieczorek, M.; Huang, X.; Maj, J.; Conley, R.; Qian, J.; Macrander, A.; Christensen, C.; Hodsden, J.; Khachatryan, R. (X-Ray Science Division); (Diamondwire Technology)

2008-01-01

429

Draft (1/5/01) The 32nd Northeast Regional Stock Assessment Workshop (32nd SAW): Advisory Report on Stock Status  

NSDL National Science Digital Library

The Northeast Fisheries Science Center (NEFSC-NOAA) has posted the 32nd Northeast Regional Stock Assessment Workshop (SAW) advisory report. The draft report targets fishery managers and provides scientific advice on the status of the resource (e.g., various fish stocks) via technical summaries. The report (.pdf format) includes stock assessments for Gulf of Maine-Georges Bank American Plaice, Sea Scallop, Silver Hake, and Gulf of Maine Haddock.

2001-01-01

430

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

431

An Analysis of SAW Interdigital Transducers with Internal Reflections and the Application to the Design of Single-Phase Unidirectional Transducers  

Microsoft Academic Search

A new coupling-of-modes (COM) analysis of SAW interdigital transducers (IDTs) is presented. The analysis includes the effects of multiple reflections within a transducer. The fundamental equations are derived and some simple closed-form results a re given. In addition, some general properties having regard to the relative phase of transduction and reflection c oefficients within a transducer are derived. A new

C. S. Hartmann; P. V. Wricjht; R. J. Kansy; E. M. Garber

1982-01-01

432

Studies on pharmacological effects of Russell's viper and Saw-scaled viper venom and its neutralization by chicken egg yolk antibodies  

Microsoft Academic Search

Antivenom antibodies were raised in 24-week-old white leghorn chickens against hemotoxic venoms of Russell's viper and Saw-scaled viper snakes. Booster injections of increasing concentrations of venom were given at 14days of time interval to raise the antivenom level in egg yolk. Antibodies were extracted from immunized chicken egg yolk by Polson et al. (Polson A., Von Wechmar M.B., Van Regenmortel

S. Meenatchisundaram; G. Parameswari; A. Michael; S. Ramalingam

2008-01-01

433

The mu - e Conversion in Nuclei, mu --> e gamma, mu --> 3e Decays and TeV Scale See-Saw Scenarios of Neutrino Mass Generation  

E-print Network

We perform a detailed analysis of lepton flavour violation (LFV) within minimal see-saw type extensions of the Standard Model (SM), which give a viable mechanism of neutrino mass generation and provide new particle content at the electroweak scale. We focus, mainly, on predictions and constraints set on each scenario from mu --> e gamma, mu --> 3e and mu - e conversion in the nuclei. In this class of models, the flavour structure of the Yukawa couplings between the additional scalar and fermion representations and the SM leptons is highly constrained by neutrino oscillation measurements. In particular, we show that in some regions of the parameters space of type I and type II see-saw models, the Dirac and Majorana phases of the neutrino mixing matrix, the ordering and hierarchy of the active neutrino mass spectrum as well as the value of the reactor mixing angle theta_{13} may considerably affect the size of the LFV observables. The interplay of the latter clearly allows to discriminate among the different low energy see-saw possibilities.

D. N. Dinh; A. Ibarra; E. Molinaro; S. T. Petcov

2012-05-21

434

An Acoustic Charge Transport Imager for High Definition Television Applications: Low-Voltage SAW Amplifiers on Multilayer GaAs/ZnO Substrates  

NASA Technical Reports Server (NTRS)

This thesis addresses the acoustoelectric issues concerning the amplification of surface acoustic waves (SAWs) and the reflection of SAWs from slanted reflector gratings on GaAs, with application to a novel acoustic charge transport (ACT) device architecture. First a simple model of the SAWAMP was developed, which was subsequently used to define the epitaxially grown material structure necessary to provide simultaneously high resistance and high electron mobility. In addition, a segmented SAWAMP structure was explored with line widths on the order of an acoustic wavelength. This resulted in the demonstration of SAWAMPS with an order of magnitude less voltage and power requirements than previously reported devices. A two-dimensional model was developed to explain the performance of devices with charge confinement layers less then 0.5 mm, which was experimentally verified. This model was extended to predict a greatly increased gain from the addition of a ZnO overlay. These overlays were experimentally attempted, but no working devices were reported due to process incompatibilities. In addition to the SAWAMP research, the reflection of SAWs from slanted gratings on GaAs was also studied and experimentally determined reflection coefficients for both 45 deg grooves and Al stripes on GaAs have been reported for the first time. The SAWAMp and reflector gratings were combined to investigate the integrated ring oscillator for application to the proposed ACT device and design parameters for this device have been provided.

Hunt, W. D.; Brennan, K. F.; Summers, C. J.; Cameron, Thomas P.

1996-01-01

435

Eating with a saw for a jaw: Functional morphology of the jaws and tooth-whorl in Helicoprion davisii.  

PubMed

The recent reexamination of a tooth-whorl fossil of Helicoprion containing intact jaws shows that the symphyseal tooth-whorl occupies the entire length of Meckel's cartilage. Here, we use the morphology of the jaws and tooth-whorl to reconstruct the jaw musculature and develop a biomechanical model of the feeding mechanism in these early Permian predators. The jaw muscles may have generated large bite-forces; however, the mechanics of the jaws and whorl suggest that Helicoprion was better equipped for feeding on soft-bodied prey. Hard shelled prey would tend to slip anteriorly from the closing jaws due to the curvature of the tooth-whorl, lack of cuspate teeth on the palatoquadrate (PQ), and resistance of the prey. When feeding on soft-bodied prey, deformation of the prey traps prey tissue between the two halves of the PQ and the whorl. The curvature of the tooth-whorl and position of the exposed teeth relative to the jaw joint results in multiple tooth functions from anterior to posterior tooth that aid in feeding on soft-bodied prey. Posterior teeth cut and push prey deeper into the oral cavity, while middle teeth pierce and cut, and anterior teeth hook and drag more of the prey into the mouth. Furthermore, the anterior-posterior edges of the teeth facilitate prey cutting with jaw closure and jaw depression. The paths traveled by each tooth during jaw depression are reminiscent of curved pathways used with slashing weaponry such as swords and knifes. Thus, the jaws and tooth-whorl may have formed a multifunctional tool for capturing, processing, and transporting prey by cyclic opening and closing of the lower jaw in a sawing fashion. J. Morphol. 276:47-64, 2015. © 2014 Wiley Periodicals, Inc. PMID:25181366

Ramsay, Jason B; Wilga, Cheryl D; Tapanila, Leif; Pruitt, Jesse; Pradel, Alan; Schlader, Robert; Didier, Dominique A

2015-01-01

436

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

437

A Single–Chip 10Band WCDMA\\/HSDPA 4Band GSM\\/EDGE SAW-less CMOS Receiver With DigRF 3G Interface and 90 dBm IIP2  

Microsoft Academic Search

This paper describes the design and performance of a 90 nm CMOS SAW-less receiver with DigRF interface that supports 10 WCDMA bands (I, II, III, IV, V, VI, VIII, IX, X, XI) and 4 GSM bands (GSM850, EGSM900, DCS1800, PCS1900). The receiver is part of a single-chip SAW-less transceiver reference platform IC for mass-market smartphones, which has been designed to

Daniel Kaczman; Manish Shah; Mohammed Alam; Mohammed Rachedine; David Cashen; Lu Han; Anand Raghavan

2009-01-01

438

VITA.SAW  

E-print Network

... 275-2378 EDUCATION 1965 Hermann Hospital School of Nursing Houston, ... 6 and 12 Months Following the Birth of Normal Infants and Infants at Risk for Apnea ... Replication Research: "Patient Well-Being as a Function of Medication and ... in Management of Premature Ventricular Contractions in the Immediate Period ...

439

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

440

Inverse see-saw, leptogenesis, observable proton decay and $?^{\\pm\\pm}_{\\rm R}$ in SUSY SO(10) with heavy W_R  

E-print Network

We explore low-scale leptogenesis in a class of supersymmetric SO(10) models using extra singlet neutrinos and the Higgs representations {126}_H\\oplus {\\ovl{126}}_H as well as {16}_H \\oplus {\\bar {16}}_H. A singlet neutrino, which can be as light as 10^5-10^6 GeV, decays through its small mixings with right-handed neutrinos creating a lepton asymmetry which is shown to be flavor dependent. While the doublet vacuum expectation value in {\\ovl{16}}_H triggers the generation of desired mixings, it also induces a large RH triplet vev that breaks the LR intermediate gauge symmetry and gives large RH neutrino masses. Manifest unification of gauge couplings and generation of heavy RH neutrino masses are achieved by renormalizable interactions. The canonical (Type-I) see-saw contributions to the light neutrino mass matrix cancel out while the Type-II see-saw contribution is negligible. Determining the parameters of the dominant inverse see-saw formula using the underlying quark-lepton symmetry and neutrino oscillation data, we show how leptogenesis under the gravitino constraint is successfully implemented. New formulas for the decay rate and the asymmetry parameter are derived leading to baryon asymmetry within the observed range. The model is found to work for hierarchical as well as inverted hierarchical light neutrino masses. Testable predictions of the model are RH doubly charged Higgs bosons which may be leptophilic and accessible to the Tevatron, LHC or a linear collider. In a model-independent manner, the Drell-Yan pair production cross section is shown to be bounded between 59%-79% of their left-handed counterparts with same mass. In contrast to single-step breaking SUSY GUTs, which predict a long proton lifetime for p\\to e^+\\pi^0, here this lifetime is substantially reduced, bringing it within one order of the current experimental limit.

Mina K. Parida; Amitava Raychaudhuri

2010-07-28

441

String-Inspired Triplet See-Saw from Diagonal Embedding of SU(2)_L in SU(2)_A x SU(2)_B  

E-print Network

Motivated by string constructions, we consider a variant on the Type II see-saw mechanism involving the exchange of triplet representations of SU(2)_L in which this group arises from a diagonal embedding into SU(2)_A x SU(2)_B. A natural assignment of Standard Model lepton doublets to the two underlying gauge groups results in a bimaximal pattern of neutrino mixings and an inverted hierarchy in masses. Simple perturbations around this leading-order structure can accommodate the observed pattern of neutrino masses and mixings.

Paul Langacker; Brent D. Nelson

2005-07-05

442

H\\/sub 2\\/ and NO\\/sub 2\\/ gas sensors with ZnO nanobelt layer on 36\\/spl deg\\/ LiTaO\\/sub 3\\/ and 64\\/spl deg\\/ LiNbO\\/sub 3\\/ SAW transducers  

Microsoft Academic Search

Single crystal nanobelts of ZnO were synthesized and deposited onto 36deg YX LiTaO3 and 64deg YX LiNbO3 surface acoustic wave (SAW) devices for gas sensing applications. Sensor response, defined as the change in resonant frequency, was measured for H2 and NO2 between 20 and 200degC. Measured sensor responses were 3.5 kHz towards 10 ppm NO2 for a 64deg LiNbO3 SAW

A. Z. Sadek; W. Wlodarski; K. Kalantar-zadeh; D. A. Powell; W. L. Hughes; B. A. Buchine; Z. L. Wang

2005-01-01

443

Development of methods of producing large areas of silicon sheet by the slicing of silicon ingots using Inside-Diameter (I.D.) saws  

NASA Technical Reports Server (NTRS)

Inside diametar wafering equipment, blades and processes were used to develop methods to produce large areas of silicon sheet. Modifications to a 16 inch STC automated saw included: programmable feed system, crystal rotating system, and STC dynatrack blade monitoring and control system. By controlling the plating operation and by grinding of the cutting edge, 16 inch ID blades with a cutting edge thickness of .22 mm can be produced. 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 ID 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

444

Development of methods of producing large areas of silicon sheet by the slicing of silicon ingots using Inside Diameter (I.D.) saws  

NASA Technical Reports Server (NTRS)

Modifications to a 16 inch STC automated saw included: a programmable feed system; a crystal rotating system; and a STC dynatrack blade boring and control system. By controlling the plating operation and by grinding the cutting edge, 16 inch I.D. blades were produced 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

445

Suppression of transverse-mode spurious responses for SAW resonators on SiO2/Al/LiNbO3 structure by selective removal of SiO2.  

PubMed

A SiO(2)/Al/LiNbO(3) structure has a large electromechanical coupling factor (K(2)) and good temperature coefficient of frequency (TCF) for applications as a SAW duplexer of the Universal Mobile Telecommunications System (UMTS) Band I. However, the SiO(2)/Al/LiNbO(3) structure also supports two unwanted spurious responses; one is caused by the Rayleigh mode and the other by the transverse mode. As the authors have previously discussed, the Rayleigh-mode spurious response can be suppressed by controlling the cross-sectional shape of a SiO(2) overlay deposited on resonator electrodes. In this paper, a new technique to suppress the transverse-mode spurious responses is proposed. In the technique, the SiO(2) overlay is selectively removed from the dummy electrode region. The spurious responses are analyzed by the laser probe system. The results indicate that the spurious responses in question were hybrid modes caused by the coupling between the main (SH) SAW and another (Rayleigh) SAW with different velocities. The hybrid-mode spurious behavior was dependent on the velocities in the IDT and the dummy regions (v(i) and v(d)). The hybrid-mode spurious responses could be suppressed by selectively removing SiO(2). Furthermore, the SAW energy confinement could be enhanced in the IDT electrode region when v(i) < v(d). The transverse-mode spurious responses were successfully suppressed without degrading the SAW resonator performances. PMID:21989882

Nakamura, Hiroyuki; Nakanishi, Hidekazu; Goto, Rei; Hashimoto, Ken-ya

2011-10-01

446

Cytotoxic activities of [Ser??]phospholipase A? from the venom of the saw-scaled vipers Echis ocellatus, Echis pyramidum leakeyi, Echis carinatus sochureki, and Echis coloratus.  

PubMed

Fractionation by reversed-phase HPLC of venom from four species of saw-scaled viper: Echis ocellatus, Echis pyramidum leakeyi, Echis carinatus sochureki, and Echis coloratus led to identification in each sample of an abundant protein with cytotoxic activity against human non-small cell lung adenocarcinoma A549 cells. The active component in each case was identified by MALDI-TOF mass fingerprinting of tryptic digests as [Ser??]phospholipase A? ([Ser??]PLA?). An isoform of [Ser??]PLA? containing the single Ala¹?? Val substitution and a partially characterized [Asp??]PLA? were also present in the E. coloratus venom. LC?? values against A549 cells for the purified [Ser??]PLA? proteins from the four species are in the range 2.9-8.5 ?M. This range is not significantly different from the range of LC?? values against human umbilical vein endothelial HUVEC cells (2.5-12.2 ?M) indicating that the [Ser??]PLA? proteins show no differential anti-tumor activity. The LC?? value for [Ser??]PLA? from E. ocellatus against human erythrocytes is >100 ?M and the MIC values against Escherichia coli and Staphylococcus aureus are >100 ?M. It is suggested that the [Ser??]PLA? proteins play a major role in producing local tissue necrosis and hemorrhage at the site of envenomation. PMID:23747272

Conlon, J Michael; Attoub, Samir; Arafat, Hama; Mechkarska, Milena; Casewell, Nicholas R; Harrison, Robert A; Calvete, Juan J

2013-09-01

447

Understanding processing-microstructure-properties relationships in Bi2Sr2CaCu2Ox/Ag round wires and enhanced transport through saw-tooth processing  

NASA Astrophysics Data System (ADS)

Superconducting magnets generating magnetic fields above 25 T are needed for many scientific applications. Due to fundamental limitations in NbTi and Nb3Sn, such high-field superconducting magnets require alternative high-field conductors. One candidate conductor is round wire composites of Bi2Sr2CaCu2Ox sheathed in a Ag-alloy matrix (Bi2212/Ag). The performance of such wires is sensitive to the heat treatment, so improvements in the critical current density (Jc) require a thorough understanding of the processing-structure-properties relationships. Here we present a two-part study. In part I, a new heat treatment approach, saw-tooth processing (STP), is introduced based upon previous results showing that Bi2212 nucleation is site-saturation limited. The microstructural evolution of Bi2212 filaments during processing is discussed and results from STP are compared with those from other processes. STP is shown to increase Jc by 120% and 70% relative to partial-melt processing at 5 T and self-field respectively, and by 65% and 34% relative to split-melt processing. Yet STP also complicates the heat treatment by introducing a number of new heat treatment variables that affect the grain morphology, phase assemblage and oxygen content of the Bi2212 filaments and thus the transport properties. In part II, the effects of STP heat treatment parameters on the microstructure and transport properties are discussed. It is shown that wires with the highest transport critical current densities primarily have filaments with two types of microstructures, one comprised primarily of highly textured Bi2212 grains, and another with a noticeable amount of Bi2Sr2CuOx with the Bi2212.

Naderi, Golsa; Liu, Xiaotao; Nachtrab, William; Schwartz, Justin

2013-10-01

448

See Saw Inflation / Dark Energy  

E-print Network

Motivated by BICEP2 results that imply gravitational waves are produced when the universe has an expansion energy of about $Mc^2 \\approx 10^{14}$ GeV and that a natural extension to the Standard Model of Particle physics is a right-handed neutrino that would or could be at $m_{\

Smoot, George F

2014-01-01

449

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.

450

UHF SAW resonators and applications  

Microsoft Academic Search

Surface acoustic wave resonators suitable for systems applications have been produced at frequencies as high as 1.43 GHz. These resonators are two-port single-pole devices with distortionless response characteristics and an unloaded Q value of 10,400\\/F(GHz) or more; they can be used to stabilize UHF oscillators or as narrowband filters. The resonators are characterized by low matched insertion loss (approximately 3

W. J. Tanski

1980-01-01

451

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

452

Randomised Controlled Double-Blind Non-Inferiority Trial of Two Antivenoms for Saw-Scaled or Carpet Viper (Echis ocellatus) Envenoming in Nigeria  

PubMed Central

Background In West Africa, envenoming by saw-scaled or carpet vipers (Echis ocellatus) causes great morbidity and mortality, but there is a crisis in supply of effective and affordable antivenom (ISRCTN01257358). Methods In a randomised, double-blind, controlled, non-inferiority trial, “EchiTAb Plus-ICP” (ET-Plus) equine antivenom made by Instituto Clodomiro Picado was compared to “EchiTAb G” (ET-G) ovine antivenom made by MicroPharm, which is the standard of care in Nigeria and was developed from the original EchiTAb-Fab introduced in 1998. Both are caprylic acid purified whole IgG antivenoms. ET-G is monospecific for Echis ocellatus antivenom (initial dose 1 vial) and ET-Plus is polyspecific for E. ocellatus, Naja nigricollis and Bitis arietans (initial dose 3 vials). Both had been screened by pre-clinical and preliminary clinical dose-finding and safety studies. Patients who presented with incoagulable blood, indicative of systemic envenoming by E. ocellatus, were recruited in Kaltungo, north-eastern Nigeria. Those eligible and consenting were randomly allocated with equal probability to receive ET-Plus or ET-G. The primary outcome was permanent restoration of blood coagulability 6 hours after the start of treatment, assessed by a simple whole blood clotting test repeated 6, 12, 18, 24 and 48 hr after treatment. Secondary (safety) outcomes were the incidences of anaphylactic, pyrogenic and late serum sickness-type antivenom reactions. Findings Initial doses permanently restored blood coagulability at 6 hours in 161/194 (83.0%) of ET-Plus and 156/206 (75.7%) of ET-G treated patients (Relative Risk [RR] 1.10 one-sided 95% CI lower limit 1.01; P?=?0.05). ET-Plus caused early reactions on more occasions than did ET-G [50/194 (25.8%) and 39/206 (18.9%) respectively RR (1.36 one-sided 95% CI 1.86 upper limit; P?=?0.06). These reactions were classified as severe in 21 (10.8%) and 11 (5.3%) of patients, respectively. Conclusion At these doses, ET-Plus was slightly more effective but ET-G was slightly safer. Both are recommended for treating E. ocellatus envenoming in Nigeria. Trial Registration Current Controlled Trials ISRCTN01257358 PMID:20668549

Abubakar, Isa S.; Abubakar, Saidu B.; Habib, Abdulrazaq G.; Nasidi, Abdulsalam; Durfa, Nandul; Yusuf, Peter O.; Garnvwa, John; Sokomba, Elijah; Salako, Lateef; Theakston, R. David G; Juszczak, Ed; Alder, Nicola; Warrell, David A.

2010-01-01

453

Safe harvesting of outer table parietal bone grafts using an oscillating saw and a bone scraper: a refinement of technique for harvesting cortical and "cancellous"-like calvarial bone.  

PubMed

Calvarial bone is a readily available source of bone for preimplantation augmentation procedures of the alveolar process. However, the calvaria consist mostly of cortical bone, and cancellous bone of the diploic space is scarce. A bone scraper (Safescraper Twist; META, Reggio Emilia, Italy) was used to create a beveled trough around the calvarial outer table graft to facilitate its removal with an oscillating saw. Using the scraper, copious amounts (>10 mL) of "cancellous"-like bone could be collected. This new application of the Safescraper Twist obviated milling down additional cortical pieces. PMID:21741740

Schortinghuis, Jurjen; Putters, Thomas F; Raghoebar, Gerry M

2012-04-01

454

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

455

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

456

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

457

What Brown saw and you can too  

E-print Network

A discussion is given of Robert Brown's original observations of particles ejected by pollen of the plant \\textit{Clarkia pulchella} undergoing what is now called Brownian motion. We consider the nature of those particles, and how he misinterpreted the Airy disc 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; Bilderback, David; Collett, Brian; Newman, Dara; Samuels, Scott

2010-01-01

458

What Brown saw and you can too  

Microsoft Academic Search

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

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

2010-01-01

459

They saw a game; a case study  

Microsoft Academic Search

When the Dartmouth football team played Princeton in 1951, much controversy was generated over what actually took place during the game. Basically, there was disagreement between the two schools as to what had happened during the game. A questionnaire designed to get reactions to the game and to learn something of the climate of opinion was administered at each school

Albert H. Hastorf; Hadley Cantril

1954-01-01

460

Analysis of aging data on SAW oscillators  

NASA Technical Reports Server (NTRS)

Test oscillators including delay lines and resonators in the 300-400 MHz range have been investigated with reference to the long-term stability (aging) characteristics. All devices were fabricated on rotated Y-cut quartz plates (40 deg), and either gold or platinum metallization was used; all packages were high-quality hermetic enclosures, and the mounting was strictly mechanical, with no organics or silicone rubbers used. It is shown that drift of less than 2 ppm in the first year can be obtained on a significant fraction of the devices when reasonably clean packages are used. The data also suggest that the transducer metallization (at least for aluminum) is very likely the source of the relaxation mechanism that causes the frequency drift.

Parker, T. E.

1980-01-01

461

See-Saw Modification of Gravity  

E-print Network

We discuss a model in which the fundamental scale of gravity is restricted to 10^{-3} eV. An observable modification of gravity occurs simultaneously at the Hubble distance and at around 0.1 mm. These predictions can be tested both by the table-top experiments and by cosmological measurements. The model is formulated as a brane-world theory embedded in a space with two or more infinite-volume extra dimensions. Gravity on the brane reproduces the four-dimensional laws at observable distances but turns to the high-dimensional behavior at larger scales. To determine the crossover distance we smooth out the singularities in the Green's functions by taking into account softening of the graviton propagator due to the high-dimensional operators that are suppressed by the fundamental scale. We find that irrespective of the precise nature of microscopic gravity the ultraviolet and infrared scales of gravity-modification are rigidly correlated. This fixes the fundamental scale of gravity at 10^{-3} eV. The result persists for nonzero thickness branes.

Gia Dvali; Gregory Gabadadze; Xin-rui Hou; Emiliano Sefusatti

2001-11-29

462

Stringy Unification Helps See-Saw Mechanism  

E-print Network

In this paper we explore the possibility of intermediate scale physics in the context of superstring models with {\\it higher Kac-Moody levels}, by focusing on left-right and Pati-Salam symmetries. We find that the left-right scale may lie in the range $10^{10} - 10^{12}$ GeV which is favored by neutrino physics, while the Pati-Salam scale is at most two or three orders of magnitude below the unification scale $M_X$. We also show that the scale of $B-L$ breaking can be as low as 1 TeV or so, providing protection against too rapid proton decay in supersymmetry. Our results allow a natural value for the scale $M_X \\sim 10^{18}$ GeV and the agreement with the experiment requires the value of $\\sin^2 {\\theta_w}$ at $M_X$ to be in general very different from the usually assumed $3/8$.

Karim Benakli; Goran Senjanovi{?}

1995-07-04

463

Sensors based on SAW and FBAR technologies  

NASA Astrophysics Data System (ADS)

Over the last few years a number of sensing platforms are being investigated for their use in drug development, microanalysis or medical diagnosis. Lab-on-a-chip (LOC) are devices integrating more than one laboratory functions on a single device chip of a very small size, and typically consist of two main components: microfluidic handling systems and sensors. The physical mechanisms that are generally used for microfluidics and sensors are different, hence making the integration of these components difficult and costly. In this work we present a lab-on-a-chip system based on surface acoustic waves (for fluid manipulation) and film bulk acoustic resonators (for sensing). Coupling surface acoustic waves into liquids induces acoustic streaming and motion of micro-droplets, whilst it is well-known that bulk acoustic waves can be used to fabricate microgravimetric sensors. Both technologies offer exceptional sensitivity and can be fabricated from piezoelectric thin films deposited on Si substrates, reducing the fabrication time/cost of the LOC devices.

García-Gancedo, L.; Milne, W. I.; Luo, J. K.; Flewitt, A. J.

2013-08-01

464

Cereal Killers What we saw in 2007  

E-print Network

Field Pea Faba Bean Lentil biology neglectus Anhydrobiosis Chickpea Triticale Safflower Flax Wild Oat SafflowerWild Oat Flax(Vanstone 2002) no chemical control #12;Early season leaf diseases Septoria Tan spot

Dyer, Bill

465

See-saw fermion masses in an SO(10) GUT  

Microsoft Academic Search

In this work we study an SO(10) GUT model with minimum Higgs representations\\u000abelonging only to the 210 and 16 dimensional representations of SO(10). We add\\u000aa singlet fermion S in addition to the usual 16 dimensional representation\\u000acontaining quarks and leptons. There are no Higgs bi-doublets and so charged\\u000afermion masses come from one-loop corrections. Consequently all the fermion

Kaushik Bhattacharya; Bipin R. Desai; G. Rajasekaran; Utpal Sarkar

2006-01-01

466

Pulse-mode temperature sensing with langasite SAW devices  

E-print Network

and Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA, USA Email: pengzhen@andrew, USA 2 Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA 3 Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, USA 4 Department of Civil

Greve, David.W.

467

Congenital Achiasma and See-Saw Nystagmus in VACTERL Syndrome  

E-print Network

been diagnosed when he was a child and bipolar affective disorder in adulthood. Even so, he completed, shortened radius, and finger abnormalities, had been surgically repaired. Attention deficit disorder had of Ophthalmology (SP, YJL), Psychology (SD, BAW), and Radiology (NF), Stanford University School of Medicine

Dumoulin, Serge O.

468

Attorney Docket No. 70011-020P01 SAGITTAL SAW  

E-print Network

of the surgical procedure. One alternative to high cutting rates includes application of an10 impulsive thrust opposed to the first end, and a longitudinal axis extending between the first end and second end. The first end extends transverse to the longitudinal axis, and movement of the first end defines a blade

Ruina, Andy L.

469

Would You Recognize Fahr's Disease if You Saw It?  

PubMed

Idiopathic basal ganglia calcification or Fahr's disease is a neurological condition with a prominent movement disorder. Diagnostically, brain imaging with computerized tomographic scanning reveals bilateral brain calcifications, usually of the basal ganglia. A positive family history is very common, along with a generational anticipatory effect, thus familial basal ganglia calcification is an alternative name. Cognitive deficits and psychiatric symptoms are often present. This progressive disease has no cure, but symptomatic treatment may be beneficial. PMID:24653939

Goyal, Dharmendra; Khan, Mashal; Qureshi, Bushra; Mier, Catherine; Lippmann, Steven

2014-01-01

470

Analysis of the natural single phase unidirectional SAW transducer  

Microsoft Academic Search

The calculation of fundamental parameters needed for the analysis of a natural single-phase unidirectional transducer (NSPUDT) is reported. Analytical forms for the NSPUDT parameters on arbitrary crystal cuts are given in terms of material constants and electrode geometry. The acoustic-wave velocity, electromechanical-coupling parameter, power-flow angle, static capacitance, transduction coefficient, and reflection from a single strip due to both electrical and

Thor Thorvaldsson

1989-01-01

471

Hole saw drill attachment has zero force reaction  

NASA Technical Reports Server (NTRS)

Zero reaction tools require no force application by workers in space. The tool accomplishes hole cutting by holding the workpiece and feeding the cutting blade into and through it by forces entirely absorbed within the tool.

Holmes, A. E.; Riley, R. H., Jr.

1966-01-01

472

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

473

The Effect of SAW Parameters on Weld Metal Chemistry  

E-print Network

recovery during submerged arc w eld- ing has been made using two commer- cial fluxes. Both iluxes were It has long·been known that the h igh temperature att ain ed during ilux shi elded arc we lding prom o' in a stud y of shielded metal arc welding using acidic fluxf'S no ted that th e weld travel sp eed had

Eagar, Thomas W.

474

I Can't Believe I Saw the Whole Thing!  

ERIC Educational Resources Information Center

The author explains some of the principles underlying holography, a process by which literally hundreds of images can be stored on a single piece of film and then reproduced, one by one, in three dimension.'' (Editor/AK)

Asimov, Isaac

1972-01-01

475

Were Those Disproofs I Saw before Me? Neil Tennant  

E-print Network

: Syme bit off another fragment of the dark-coloured bread, chewed it briefly, and went on: 'Don't you in the appendix to the book. Does the project sketched by Syme have any philosophical snag which could

Tennant, Neil

476

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

477

Chop Saw SUCCESS!: "Crash Proofing" a Metalworking Lab  

ERIC Educational Resources Information Center

The Technology Department at Appalachian State University runs a metals lab to introduce students to basic metalworking processes. Many of the students have never worked with metal before. The class objectives call for teaching students metal properties, processing, and design problem solving. The average student is a 20-year-old junior whom…

Domermuth, David

2004-01-01

478

Surface photovoltage measurements and finite element modeling of SAW devices.  

SciTech Connect

Over the course of a Summer 2011 internship with the MEMS department of Sandia National Laboratories, work was completed on two major projects. The first and main project of the summer involved taking surface photovoltage measurements for silicon samples, and using these measurements to determine surface recombination velocities and minority carrier diffusion lengths of the materials. The SPV method was used to fill gaps in the knowledge of material parameters that had not been determined successfully by other characterization methods. The second project involved creating a 2D finite element model of a surface acoustic wave device. A basic form of the model with the expected impedance response curve was completed, and the model is ready to be further developed for analysis of MEMS photonic resonator devices.

Donnelly, Christine

2012-03-01

479

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

480

"I Saw the Universe and I Saw the World": Exploring Spiritual Literacy with Young Children in a Primary Classroom  

ERIC Educational Resources Information Center

This paper explores the concept of promoting spiritual literacy as viewed through the eyes of a holistic educator of young children in an inner-city primary classroom. Similar to discussions of spirituality in education, the idea of spiritual literacy is often elusive and can create discomfort and tensions. Drawing on stories of experience, the…

Binder, Marni J.

2011-01-01

481

5/3/12 D. Haskell 1 of 46 Wfr_Saw_Op_r2 Micro Automation Wafer Dicing Saw  

E-print Network

............................................................................. 43 Appendix 5: Machine Modes be trained and certified by a Super user. 2) Never leave system unattended while cutting. 3) Use the Standby. 12) Substrate should always have adhesive film on backside. a) See Appendix if necessary. 13

Yoo, S. J. Ben

482

Practitioner experience with sonic osteotomy compared to bur and ultrasonic saw: a pilot in vitro study.  

PubMed

The aim of the present study was to compare subjective experiences using bur, ultrasonic, and sonic osteotomy systems. Ten novice (N) and 10 expert (E) practitioners performed osteotomies on bovine ribs with each system. They scored ease of handling and sense of accuracy on visual analogue scales. The duration of the osteotomy procedure and the amount of noise were recorded objectively. Learning experience was evaluated in a second run. The Mann-Whitney U-test, Wilcoxon signed rank tests, and Spearman's rank correlation coefficient were used for the statistical analyses. The sonic system was significantly slower, with the worst noise impact (92.9dB; standard deviation (SD) 7.1). However, both user groups improved significantly in the second run (N 7.9, E 7.6). There were no significant differences in handling. The sense of accuracy was evaluated to be significantly best for the sonic system (N 8.4, E 8.4), compared to the ultrasonic system (N 7.1, E 7.1; both P=0.043) and bur system (N 5.5, P=0.002; E 6.0, P=0.006). The practitioners had a promising experience with the application of the ultrasonic system and particularly with the sonic system. PMID:25277806

Rashad, A; Sadr-Eshkevari, P; Heiland, M; Smeets, R; Prochnow, N; Hoffmann, E; Maurer, P

2015-02-01

483

Modeling Saw-Tooth Injections During April 17-18, 2002  

NASA Astrophysics Data System (ADS)

During April 2002, a number of magnetic storm occurred in the magnetosphere, which included a number of interesting features. One of these is sawtooth-type injections, observed by geosynchronous satellites on April 18. During the same period, oscillations were also observed in the cross polar cap potential. At the present time, the relation between these two phenomena as well as the source of the quasi-periodic injections is not understood. Using a combination of the BATSRUS global MHD simulation developed by the University of Michigan and Mei-Ching Fok's ring current model, we will examine the relationship between injections in the inner magnetosphere and the underlying magnetospheric dynamics. In particular, we will examine the timing of the oscillations in the cross polar cap potential and injections in the ring current, as well as their causal connection. Our results will be compared to the observations during the period of interest.

Keller, K. A.; Hesse, M.; Rastaetter, L.; Falasca, A.; Kuznetsova, M. M.; Fok, M.; Gombosi, T. I.; Dezeeuw, D. L.

2002-12-01

484

Durability of Saw-Cut Joints in Plain Cement Concrete Pavements  

Microsoft Academic Search

The objective of this project was to evaluate factors influencing the durability of the joints in portland cement concrete pavement in the state of Indiana. Specifically this work evaluated the absorption of water, the absorption of deicing solutions, the relationship between the degree of saturation and concrete deterioration, and the role of Soy Mehyl Esters as a potential concrete sealant.

Javier Castro; Wenting Li; Mohammad Pour-Ghaz; Mike Golias; Bernie Tao; Hongfang Sun; William Jason Weiss

2011-01-01

485

Influence of macrostructure on tensile properties of multipass SAW C-Mn steel deposits  

NASA Astrophysics Data System (ADS)

Blocks of 'all weld' metal were prepared by a multipass submerged arc process, using a C-Mn filler wire, at different welding currents and speeds by keeping the arc voltage constant. The variation in welding parameters was found to alter the macrostructure primarily by influencing its co-axial dendrite content. The chemical composition and hardness of the dendritic and the heat affected regions were affected little by the welding parameters. A dendrite content up to 37%, had no significant effect on the tensile properties. However an increase in it beyond 37% was found to enhance the UTS and YS and reduce percent elongation. The tensile strength was found to be a maximum in the L orientation and a minimum in the S direction. The use of post-weld heat treatment (PWHT) at 873 K caused spheroidization of cementite there by somewhat reducing the hardness and strength. The treatment while not affecting the basic dendritic morphology reduced the observed difference in tensile properties along the L, T and S directions. Implications of the data vis-a-vis industrial applications have been discussed.

Yongyuth, P.; Ghosh, P. K.; Gupta, P. C.; Patwardhan, A. K.; Prakash, Satya

1993-06-01

486

The things a man once saw (and was): an appreciation of Richard Quinney  

Microsoft Academic Search

Richard Quinney ranks among the noted criminologists of the twentieth century, especially among progressives. He is also a photographer of note, drawing on scenes from his native Wisconsin to reflect his deep inner life. Things once seen, published in 2009 by Borderland Books, is a 40?year retrospective of his photographic work. It is a deeply religious work that celebrates the

Dennis Sullivan

2010-01-01