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Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Nonlinear Cerenkov Radiation in Nonlinear Photonic Crystal Waveguides  

SciTech Connect

We study nonlinear Cerenkov radiation generated from a nonlinear photonic crystal waveguide where the nonlinear susceptibility tensor is modulated by the ferroelectric domain. Nonlinear polarization driven by an incident light field may emit coherently harmonic waves at new frequencies along the direction of Cerenkov angles. Multiple radiation spots with different azimuth angles are simultaneously exhibited from such a hexagonally poled waveguide. A scattering involved nonlinear Cerenkov arc is also observed for the first time. Cerenkov radiation associated with quasi-phase matching leads to these novel nonlinear phenomena.

Zhang, Y.; Gao, Z. D.; Qi, Z.; Zhu, S. N.; Ming, N. B. [National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093 (China)

2008-04-25T23:59:59.000Z

2

Dynamic Time Expansion and Compression Using Nonlinear Waveguides  

DOE Patents (OSTI)

Dynamic time expansion or compression of a small amplitude input signal generated with an initial scale is performed using a nonlinear waveguide. A nonlinear waveguide having a variable refractive index is connected to a bias voltage source having a bias signal amplitude that is large relative to the input signal to vary the reflective index and concomitant speed of propagation of the nonlinear waveguide and an electrical circuit for applying the small amplitude signal and the large amplitude bias signal simultaneously to the nonlinear waveguide. The large amplitude bias signal with the input signal alters the speed of propagation of the small-amplitude signal with time in the nonlinear waveguide to expand or contract the initial time scale of the small-amplitude input signal.

Findikoglu, Alp T.; Hahn, Sangkoo F.; Jia, Quanxi

2004-06-22T23:59:59.000Z

3

Dynamic time expansion and compression using nonlinear waveguides  

DOE Patents (OSTI)

Dynamic time expansion or compression of a small-amplitude input signal generated with an initial scale is performed using a nonlinear waveguide. A nonlinear waveguide having a variable refractive index is connected to a bias voltage source having a bias signal amplitude that is large relative to the input signal to vary the reflective index and concomitant speed of propagation of the nonlinear waveguide and an electrical circuit for applying the small-amplitude signal and the large amplitude bias signal simultaneously to the nonlinear waveguide. The large amplitude bias signal with the input signal alters the speed of propagation of the small-amplitude signal with time in the nonlinear waveguide to expand or contract the initial time scale of the small-amplitude input signal.

Findikoglu, Alp T. (Los Alamos, NM); Hahn, Sangkoo F. (Los Alamos, NM); Jia, Quanxi (Los Alamos, NM)

2004-06-22T23:59:59.000Z

4

Nonlinear Landau-Zener tunneling in coupled waveguide arrays  

SciTech Connect

The possibility of direct observation of the nonlinear Landau-Zener tunneling effect with a device consisting of two waveguide arrays connected to a tilted reduced refractive index barrier is discussed. Numerical simulations on this realistic setup are interpreted via a simplified double-well system and different asymmetric tunneling scenarios are predicted varying just the injected beam intensity.

Khomeriki, Ramaz [Physics Department, Tbilisi State University, 3 Chavchavadze, 0128 Tbilisi (Georgia) and Max-Planck-Institut fuer Physik komplexer Systeme, Noethnitzerstrasse 38, D-01187 Dresden (Germany)

2010-07-15T23:59:59.000Z

5

Fabrication of band-gap structures in planar nonlinear waveguides for second harmonic generation  

Science Conference Proceedings (OSTI)

The work presented here deals with the design and fabrication of the linear grating on a LiNbO3 planar waveguide to obtain an efficient second harmonic generation operating in Cerenkov configuration. The lithium niobate is a nonlinear material ... Keywords: e-beam lithography, nonlinear optics

V. Foglietti; E. Cianci; D. Pezzetta; C. Sibilia; M. Marangoni; R. Osellame; R. Ramponi

2003-06-01T23:59:59.000Z

6

Nonlinear optical coupler using a doped optical waveguide  

DOE Patents (OSTI)

An optical mode coupling apparatus includes an Erbium-doped optical waveguide in which an optical signal at a signal wavelength propagates in a first spatial propagation mode and a second spatial propagation mode of the waveguide. The optical signal propagating in the waveguide has a beat length. The coupling apparatus includes a pump source of perturbational light signal at a perturbational wavelength that propagates in the waveguide in the first spatial propagation mode. The perturbational signal has a sufficient intensity distribution in the waveguide that it causes a perturbation of the effective refractive index of the first spatial propagation mode of the waveguide in accordance with the optical Kerr effect. The perturbation of the effective refractive index of the first spatial propagation mode of the optical waveguide causes a change in the differential phase delay in the optical signal propagating in the first and second spatial propagation modes. The change in the differential phase delay is detected as a change in the intensity distribution between two lobes of the optical intensity distribution pattern of an output signal. The perturbational light signal can be selectively enabled and disabled to selectively change the intensity distribution in the two lobes of the optical intensity distribution pattern.

Pantell, Richard H. (Menlo Park, CA); Sadowski, Robert W. (Stanford, CA); Digonnet, Michel J. F. (Palo Alto, CA); Shaw, Herbert J. (Stanford, CA)

1994-01-01T23:59:59.000Z

7

Symmetric and asymmetric solitons and vortices in linearly coupled two-dimensional waveguides with the cubic-quintic nonlinearity  

E-Print Network (OSTI)

It is well known that the two-dimensional (2D) nonlinear Schr\\"odinger equation (NLSE) with the cubic-quintic (CQ) nonlinearity supports a family of stable fundamental solitons, as well as solitary vortices (alias vortex rings), which are stable for sufficiently large values of the norm. We study stationary localized modes in a symmetric linearly coupled system of two such equations, focusing on asymmetric states. The model may describe "optical bullets" in dual-core nonlinear optical waveguides (including spatiotemporal vortices that were not discussed before), or a Bose-Einstein condensate (BEC) loaded into a "dual-pancake" trap. Each family of solutions in the single-component model has two different counterparts in the coupled system, one symmetric and one asymmetric. Similarly to the earlier studied coupled 1D system with the CQ nonlinearity, the present model features bifurcation loops, for fundamental and vortex solitons alike: with the increase of the total energy (norm), the symmetric solitons become...

Dror, Nir

2010-01-01T23:59:59.000Z

8

Characterization of third order nonlinearities in TiO? waveguides at 1550 nm  

E-Print Network (OSTI)

Polycrystalline anatase titanium dioxide waveguides are investigated as an alternative material for all-optical switching at telecommunications C-band wavelengths. Titanium dioxide does not support two-photon absorption ...

Shtyrkova, Katia

2013-01-01T23:59:59.000Z

9

Guided wave methods and apparatus for nonlinear frequency generation  

DOE Patents (OSTI)

Methods and apparatus are disclosed for the nonlinear generation of sum and difference frequencies of electromagnetic radiation propagating in a nonlinear material. A waveguide having a waveguide cavity contains the nonlinear material. Phase matching of the nonlinear generation is obtained by adjusting a waveguide propagation constant, the refractive index of the nonlinear material, or the waveguide mode in which the radiation propagates. Phase matching can be achieved even in isotropic nonlinear materials. A short-wavelength radiation source uses phase-matched nonlinear generation in a waveguide to produce high harmonics of a pulsed laser.

Durfee, III, Charles G. (Ann Arbor, MI); Rundquist, Andrew (Austin, TX); Kapteyn, Henry C. (Ann Arbor, MI); Murnane, Margaret M. (Ann Arbor, MI)

2000-01-01T23:59:59.000Z

10

LOADED WAVEGUIDES  

DOE Patents (OSTI)

>Loaded waveguides are described for the propagation of electromagnetic waves with reduced phase velocities. A rectangular waveguide is dimensioned so as to cut-off the simple H/sub 01/ mode at the operating frequency. The waveguide is capacitance loaded, so as to reduce the phase velocity of the transmitted wave, by connecting an electrical conductor between directly opposite points in the major median plane on the narrower pair of waveguide walls. This conductor may take a corrugated shape or be an aperature member, the important factor being that the electrical length of the conductor is greater than one-half wavelength at the operating frequency. Prepared for the Second U.N. International ConferThe importance of nuclear standards is duscussed. A brief review of the international callaboration in this field is given. The proposal is made to let the International Organization for Standardization (ISO) coordinate the efforts from other groups. (W.D.M.)

Mullett, L.B.; Loach, B.G.; Adams, G.L.

1958-06-24T23:59:59.000Z

11

Parabolic tapers for overmoded waveguides  

DOE Patents (OSTI)

A waveguide taper with a parabolic profile, in which the distance along the taper axis varies as the square of the tapered dimension, provides less mode conversion than equal length linear tapers and is easier to fabricate than other non-linear tapers.

Doane, J.L.

1983-11-25T23:59:59.000Z

12

A Composite View of Surface Signatures and Interior Properties of Nonlinear Internal Waves: Observations and Applications  

Science Conference Proceedings (OSTI)

Surface signatures and interior properties of large-amplitude nonlinear internal waves (NLIWs) in the South China Sea (SCS) were measured during a period of weak northeast wind (2 m s?1) using shipboard marine radar, an acoustic Doppler current ...

Ming-Huei Chang; Ren-Chieh Lien; Yiing Jang Yang; Tswen Yung Tang; Joe Wang

2008-07-01T23:59:59.000Z

13

Waveguide electrooptic switch arrays  

Science Conference Proceedings (OSTI)

A review is presented of electrooptic waveguide switch arrays with strong emphasis on those based on titanium-diffused lithium niobate waveguides. Crosspoint and array design considerations and performance are discussed as are waveguide technology limits. ...

R. C. Alferness

2006-09-01T23:59:59.000Z

14

Birefringent corrugated waveguide  

DOE Patents (OSTI)

A corrugated waveguide having a circular bore and noncircularly symmetric corrugations, and preferably elliptical corrugations, provides birefringence for rotation of polarization in the HE{sub 11} mode. The corrugated waveguide may be fabricated by cutting circular grooves on a lathe in a cylindrical tube or rod of aluminium of a diameter suitable for the bore of the waveguide, and then cutting an approximation to ellipses for the corrugations using a cutting radius R{sub 0} from the bore axis that is greater than the bore radius, and then making two circular cuts using a radius R{sub 1} less than R{sub 0} at centers +b and {minus}b from the axis of the waveguide bore. Alternatively, stock for the mandrel may be formed with an elliptical transverse cross section, and then only the circular grooves need be cut on a lathe, leaving elliptical corrugations between the grooves. In either case, the mandrel is first electroplated and then dissolved leaving a corrugated waveguide with noncircularly symmetric waveguides. A transition waveguide is used that gradually varies from circular to elliptical corrugations to couple a circularly corrugated waveguide to an elliptically corrugated waveguide.

Moeller, C.P.

1989-02-15T23:59:59.000Z

15

Broad band waveguide spectrometer  

DOE Patents (OSTI)

A spectrometer for analyzing a sample of material utilizing a broad band source of electromagnetic radiation and a detector. The spectrometer employs a waveguide possessing an entry and an exit for the electromagnetic radiation emanating from the source. The waveguide further includes a surface between the entry and exit portions which permits interaction between the electromagnetic radiation passing through the wave guide and a sample material. A tapered portion forms a part of the entry of the wave guide and couples the electromagnetic radiation emanating from the source to the waveguide. The electromagnetic radiation passing from the exit of the waveguide is captured and directed to a detector for analysis.

Goldman, Don S. (Folsom, CA)

1995-01-01T23:59:59.000Z

16

Energy Transport by Nonlinear Internal Waves  

Science Conference Proceedings (OSTI)

Winter stratification on Oregon’s continental shelf often produces a near-bottom layer of dense fluid that acts as an internal waveguide upon which nonlinear internal waves propagate. Shipboard profiling and bottom lander observations capture ...

J. N. Moum; J. M. Klymak; J. D. Nash; A. Perlin; W. D. Smyth

2007-07-01T23:59:59.000Z

17

Birefringent corrugated waveguide  

DOE Patents (OSTI)

A corrugated waveguide having a circular bore and noncircularly symmetric corrugations, and preferably elliptical corrugations, provides birefringence for rotation of polarization in the HE.sub.11 mode. The corrugated waveguide may be fabricated by cutting circular grooves on a lathe in a cylindrical tube or rod of aluminum of a diameter suitable for the bore of the waveguide, and then cutting an approximation to ellipses for the corrugations using a cutting radius R.sub.0 from the bore axis that is greater than the bore radius, and then making two circular cuts using a radius R.sub.1 less than R.sub.0 at centers +b and -b from the axis of the waveguide bore. Alternatively, stock for the mandrel may be formed with an elliptical transverse cross section, and then only the circular grooves need be cut on a lathe, leaving elliptical corrugations between the grooves. In either case, the mandrel is first electroplated and then dissolved leaving a corrugated waveguide with noncircularly symmetric corrugations. A transition waveguide is used that gradually varies from circular to elliptical corrugations to couple a circularly corrugated waveguide to an elliptically corrugated waveguide.

Moeller, Charles P. (Del Mar, CA)

1990-01-01T23:59:59.000Z

18

Surface modification to waveguides  

DOE Patents (OSTI)

A method of treating the interior surfaces of a waveguide to improve power transmission comprising the steps of mechanically polishing to remove surface protrusions; electropolishing to remove embedded particles; ultrasonically cleaning to remove any residue; coating the interior waveguide surfaces with an alkyd resin solution or electrophoretically depositing carbon lamp black suspended in an alkyd resin solution to form a 1.mu. to 5.mu. thick film; vacuum pyrolyzing the film to form a uniform adherent carbon coating.

Timberlake, John R. (Allentown, NJ); Ruzic, David N. (Kendall Park, NJ); Moore, Richard L. (Princeton, NJ); Cohen, Samuel A. (Pennington, NJ); Manos, Dennis M. (Lawrenceville, NJ)

1983-01-01T23:59:59.000Z

19

Surface modification to waveguides  

DOE Patents (OSTI)

A method is described for treating the interior surfaces of a waveguide to improve power transmission comprising the steps of mechanically polishing to remove surface protrusions; electropolishing to remove embedded particles; ultrasonically cleaning to remove any residue; coating the interior waveguide surfaces with an alkyd resin solution or electrophoretically depositing carbon lamp black suspended in an alkyd resin solution to form a 1..mu.. to 5..mu.. thick film; vacuum pyrolyzing the film to form a uniform adherent carbon coating.

Timberlake, J.R.; Ruzic, D.N.; Moore, R.L.; Cohen, S.A.; Manos, D.M.

1982-06-16T23:59:59.000Z

20

Aqueous carrier waveguide in a flow cytometer  

DOE Patents (OSTI)

The liquid of a flow cytometer itself acts as an optical waveguide, thus transmitting the light to an optical filter/detector combination. This alternative apparatus and method for detecting scattered light in a flow cytometer is provided by a device which views and detects the light trapped within the optical waveguide formed by the flow stream. A fiber optic or other light collecting device is positioned within the flow stream. This provides enormous advantages over the standard light collection technique which uses a microscope objective. The signal-to-noise ratio is greatly increased over that for right-angle-scattered light collected by a microscope objective, and the alignment requirements are simplified.

Mariella, Jr., Raymond P. (Danville, CA); van den Engh, Gerrit (Seattle, WA); Northrup, M. Allen (Berkeley, CA)

1995-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Ultrafast nonlinear optical properties of passive and active semiconductor devices  

E-Print Network (OSTI)

Nonlinear optical properties and ultrafast carrier dynamics of slab-coupled optical waveguide amplifiers, silicon nanowaveguides, and III-V semiconductor saturable Bragg reflectors are studied. The limits imposed by two ...

Motamedi, Ali Reza

2011-01-01T23:59:59.000Z

22

Nonlinear silicon photonics from the near to mid infrared.  

E-Print Network (OSTI)

??This dissertation presents experimental work investigating silicon-on-insulator (SOI) photonic waveguides for parametric nonlinear optic devices. An introduction is presented in Chapter 1, including background and… (more)

Park, Jung Soo

2010-01-01T23:59:59.000Z

23

Folded waveguide coupler  

DOE Patents (OSTI)

A resonant cavity waveguide coupler for ICRH of a magnetically confined plasma. The coupler consists of a series of inter-leaved metallic vanes disposed within an enclosure analogous to a very wide, simple rectangular waveguide that has been ''folded'' several times. At the mouth of the coupler, a polarizing plate is provided which has coupling apertures aligned with selected folds of the waveguide through which rf waves are launched with magnetic fields of the waves aligned in parallel with the magnetic fields confining the plasma being heated to provide coupling to the fast magnetosonic wave within the plasma in the frequency usage of from about 50 to 200 mHz. A shorting plate terminates the back of the cavity at a distance approximately equal to one-half the guide wavelength from the mouth of the coupler to ensure that the electric field of the waves launched through the polarizing plate apertures are small while the magnetic field is near a maximum. Power is fed into the coupler folded cavity by means of an input coaxial line feed arrangement at a point which provides an impedance match between the cavity and the coaxial input line.

Owens, T.L.

1986-10-27T23:59:59.000Z

24

Folded waveguide coupler  

DOE Patents (OSTI)

A resonant cavity waveguide coupler for ICRH of a magnetically confined plasma. The coupler consists of a series of inter-leaved metallic vanes disposed withn an enclosure analogous to a very wide, simple rectangular waveguide that has been "folded" several times. At the mouth of the coupler, a polarizing plate is provided which has coupling apertures aligned with selected folds of the waveguide through which rf waves are launched with magnetic fields of the waves aligned in parallel with the magnetic fields confining the plasma being heated to provide coupling to the fast magnetosonic wave within the plasma in the frequency usage of from about 50-200 mHz. A shorting plate terminates the back of the cavity at a distance approximately equal to one-half the guide wavelength from the mouth of the coupler to ensure that the electric field of the waves launched through the polarizing plate apertures are small while the magnetic field is near a maximum. Power is fed into the coupler folded cavity by means of an input coaxial line feed arrangement at a point which provides an impedance match between the cavity and the coaxial input line.

Owens, Thomas L. (Kingston, TN)

1988-03-01T23:59:59.000Z

25

Resonant excitation of coherent Cerenkov radiation in dielectric lined waveguides  

Science Conference Proceedings (OSTI)

We report the observation of coherent Cerenkov radiation in the terahertz regime emitted by a relativistic electron pulse train passing through a dielectric lined cylindrical waveguide. We describe the beam manipulations and measurements involved in repetitive pulse train creation including comb collimation and nonlinear optics corrections. With this technique, modes beyond the fundamental are selectively excited by use of the appropriate frequency train. The spectral characterization of the structure shows preferential excitation of the fundamental and of a higher longitudinal mode.

Andonian, G.; Williams, O.; Wei, X.; Niknejadi, P.; Hemsing, E.; Rosenzweig, J. B. [Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095 (United States); Muggli, P. [University of Southern California, Los Angeles, California 90089 (United States); Babzien, M.; Fedurin, M.; Kusche, K.; Malone, R.; Yakimenko, V. [Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973 (United States)

2011-05-16T23:59:59.000Z

26

Scintillator Waveguide For Sensing Radiation  

DOE Patents (OSTI)

The present invention is an apparatus for detecting ionizing radiation, having: a waveguide having a first end and a second end, the waveguide formed of a scintillator material wherein the therapeutic ionizing radiation isotropically generates scintillation light signals within the waveguide. This apparatus provides a measure of radiation dose. The apparatus may be modified to permit making a measure of location of radiation dose. Specifically, the scintillation material is segmented into a plurality of segments; and a connecting cable for each of the plurality of segments is used for conducting scintillation signals to a scintillation detector.

Bliss, Mary (West Richland, WA); Craig, Richard A. (West Richland, WA); Reeder; Paul L. (Richland, WA)

2003-04-22T23:59:59.000Z

27

Simplified flangeless unisex waveguide coupler assembly  

DOE Patents (OSTI)

A unisex coupler assembly is disclosed capable of providing a leak tight coupling for waveguides with axial alignment of the waveguides and rotational capability. The sealing means of the coupler assembly are not exposed to RF energy, and the coupler assembly does not require the provision of external flanges on the waveguides. In a preferred embodiment, O ring seals are not used and the coupler assembly is, therefore, bakeable at a temperature up to about 150{degrees}C. The coupler assembly comprises a split collar which clamps around the waveguides and a second collar which fastens to the split collar. The split collar contains an inner annular groove. Each of the waveguides is provided with an external annular groove which receives a retaining ring. The split collar is clamped around one of the waveguides with the inner annular groove of the split collar engaging the retaining ring carried in the external annular groove in the waveguide. The second collar is then slipped over the second waveguide behind the annular groove and retaining ring therein and the second collar is coaxially secured by fastening means to the split collar to draw the respective waveguides together by coaxial force exerted by the second collar against the retaining ring on the second waveguide. A sealing ring is placed against an external sealing surface at a reduced external diameter end formed on one waveguide to sealingly engage a corresponding sealing surface on the other waveguide as the waveguides are urged toward each other.

DiMartino, M.; Moeller, C.P.

1992-12-31T23:59:59.000Z

28

Optical waveguide tamper sensor technology  

DOE Green Energy (OSTI)

Dielectric optical waveguides exhibit properties that are well suited to sensor applications. They have low refractive index and are transparent to a wide range of wavelengths. They can react with the surrounding environment in a variety of controllable ways. In certain sensor applications, it is advantageous to integrate the dielectric waveguide on a semiconductor substrate with active devices. In this work, we demonstrate a tamper sensor based on dielectric waveguides that connect epitaxial GaAs-GaAlAs sources and detectors. The tamper sensing function is realized by attaching particles of absorbing material with high refractive index to the surface of the waveguides. These absorbers are then attached to a lid or cover, as in an integrated circuit package or multi-chip module. The absorbers attenuate the light in the waveguides as a function of absorber interaction. In the tamper indicating mode, the absorbers are placed randomly on the waveguides, to form a unique attenuation pattern that is registered by the relative signal levels on the photodetectors. When the lid is moved, the pattern of absorbers changes, altering the photodetector signals. This dielectric waveguide arrangement is applicable to a variety of sensor functions, and specifically can be fabricated as a chemical sensor by the application of cladding layers that change their refractive index and/or optical absorption properties upon exposure to selected chemical species. An example is found in palladium claddings that are sensitive to hydrogen. A description of designs and a basic demonstration of the tamper sensing and chemical sensing functions is described herein.

Carson, R.F.; Butler, M.A.; Sinclair, M.B. [and others

1997-03-01T23:59:59.000Z

29

Slow Waveguide Structures for Particle Accelerators  

ORNL 2010-G00971/jcn UT-B ID 200802074 Slow Waveguide Structures for Particle Accelerators Technology Summary A waveguide design that can save time and money in the ...

30

Graphene nano-ribbon waveguides  

E-Print Network (OSTI)

Graphene as a one-atom-thick platform for infrared metamaterial plays an important role in optical science and engineering. Here we study the unique properties of some plasmonic waveguides based on graphene nano-ribbon. It is found that a graphene ribbon of finite width leads to the occurrence of coupled edge mode. The single-mode region of a single freestanding graphene ribbon is identified at a fixed frequency of 30 THz. A low-loss waveguide structure, consisting of a graphene layer, a silica buffer layer and silicon substrate is proposed to reduce the propagation loss and obtain a high figure of merit for future integration of waveguide devices. Furthermore, two coupled ribbon configurations, namely, side-side coupling and top-bottom coupling, are investigated. As a device example, a nano-ring cavity of ultra-small size is designed.

He, S; He, Y

2013-01-01T23:59:59.000Z

31

Plasmons in Waveguide Structures Formed by Two Graphene Layers  

E-Print Network (OSTI)

Plasmon modes in a waveguide formed by two parallel graphene layers with an insulator spacer layer are considered. The existence of TM and TE guided modes is predicted and their properties are compared with those of plasmons in metal/insulator waveguides. DOI: 10.1134/S0021364013090063 Much attention has been attracted in recent years to graphene, a material made up of a two-dimensional lattice of carbon atoms [1–4]. From the fundamental point of view, graphene is interesting because charge carriers in this material are characterized by a linear dispersion relation, which leads to such phenomena as the room-temperature quantum Hall effect [5] and the existence of a nonzero Berry phase for charge carriers [2]. Graphene is also promising for applications owing to the high charge-carrier mobility, which is required for the new generation of electronic integrated circuits [6].

unknown authors

2013-01-01T23:59:59.000Z

32

Optical fiber having wave-guiding rings  

DOE Patents (OSTI)

A waveguide includes a cladding region that has a refractive index that is substantially uniform and surrounds a wave-guiding region that has an average index that is close to the index of the cladding. The wave-guiding region also contains a thin ring or series of rings that have an index or indices that differ significantly from the index of the cladding. The ring or rings enable the structure to guide light.

Messerly, Michael J. (Danville, CA); Dawson, Jay W. (Livermore, CA); Beach, Raymond J. (Livermore, CA); Barty, Christopher P. J. (Hayward, CA)

2011-03-15T23:59:59.000Z

33

Silicon Nano-Crystal Waveguide (SNOW) Laser  

Silicon Nano-Crystal Waveguide (SNOW) Laser Note: The technology described above is an early stage opportunity. Licensing rights to this intellectual property may

34

Slow Waveguide Structures for Particle Accelerators  

The beam line is used for basic science investigations as well as for applications ... waveguide structure to support transmission of particles at ...

35

Slow Waveguide Structures for Particle Accelerators  

A waveguide design that can save time and money in the construction and tuning ofa particle accelerator was developed by ORNL researchers. Particle ...

36

Propagation in LHM slab loaded rectangular waveguide  

Science Conference Proceedings (OSTI)

The strange properties of Left - Handed Materials (LHM), whose permittivity and permeability are both negative, is briefly introduced. The electric- and magnetic-field components are given in rectangular waveguide loaded with LHM by use of field component ... Keywords: cutoff wavelength, dispersion equation, group velocity, left-handed materials, rectangular waveguide

Rui-Lian Li

2011-09-01T23:59:59.000Z

37

Barrier transmission for the Nonlinear Schrödinger Equation: Surprises of nonlinear transport  

E-Print Network (OSTI)

In this communication we report on a peculiar property of barrier transmission that systems governed by the nonlinear Schroedinger equation share with the linear one: For unit transmission the potential can be divided at an arbitrary point into two sub-potentials, a left and a right one, which have exactly the same transmission. This is a rare case of an exact property of a nonlinear wave function which will be of interest, e.g., for studies of coherent transport of Bose-Einstein condensates through mesoscopic waveguide

K. Rapedius; H. J. Korsch

2008-05-14T23:59:59.000Z

38

Method of making a scintillator waveguide  

DOE Patents (OSTI)

The present invention is an apparatus for detecting ionizing radiation, having: a waveguide having a first end and a second end, the waveguide formed of a scintillator material wherein the therapeutic ionizing radiation isotropically generates scintillation light signals within the waveguide. This apparatus provides a measure of radiation dose. The apparatus may be modified to permit making a measure of location of radiation dose. Specifically, the scintillation material is segmented into a plurality of segments; and a connecting cable for each of the plurality of segments is used for conducting scintillation signals to a scintillation detector.

Bliss, Mary (West Richland, WA); Craig, Richard A. (West Richland, WA); Reeder, Paul L. (Richland, WA)

2000-01-01T23:59:59.000Z

39

Waveguide-based optical chemical sensor  

DOE Patents (OSTI)

The invention provides an apparatus and method for highly selective and sensitive chemical sensing. Two modes of laser light are transmitted through a waveguide, refracted by a thin film host reagent coating on the waveguide, and analyzed in a phase sensitive detector for changes in effective refractive index. Sensor specificity is based on the particular species selective thin films of host reagents which are attached to the surface of the planar optical waveguide. The thin film of host reagents refracts laser light at different refractive indices according to what species are forming inclusion complexes with the host reagents.

Grace, Karen M. (Ranchos de Taos, NM); Swanson, Basil I. (Los Alamos, NM); Honkanen, Seppo (Tucson, AZ)

2007-03-13T23:59:59.000Z

40

Fiber to waveguide couplers for silicon photonics  

E-Print Network (OSTI)

As silicon photonics enters mainstream technology, we find ourselves in need of methods to seamlessly transfer light between the optical fibers of global scale telecommunications networks and the on-chip waveguides used ...

Montalbo, Trisha M., 1980-

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Twisted waveguides for particle accelerator applications  

E-Print Network (OSTI)

A novel microwave device for accelerating charged particles based on twisted waveguide is presented. Twisted guides support slow-wave TM modes whose phase velocity could reach the speed of light c. The axial electric field ...

Wilson, Joshua L.

42

Mid-infrared optical parametric amplifier using silicon nanophotonic waveguides  

E-Print Network (OSTI)

All-optical signal processing is envisioned as an approach to dramatically decrease power consumption and speed up performance of next-generation optical telecommunications networks. Nonlinear optical effects, such as four-wave mixing (FWM) and parametric gain, have long been explored to realize all-optical functions in glass fibers. An alternative approach is to employ nanoscale engineering of silicon waveguides to enhance the optical nonlinearities by up to five orders of magnitude, enabling integrated chip-scale all-optical signal processing. Previously, strong two-photon absorption (TPA) of the telecom-band pump has been a fundamental and unavoidable obstacle, limiting parametric gain to values on the order of a few dB. Here we demonstrate a silicon nanophotonic optical parametric amplifier exhibiting gain as large as 25.4 dB, by operating the pump in the mid-IR near one-half the band-gap energy (E~0.55eV, lambda~2200nm), at which parasitic TPA-related absorption vanishes. This gain is high enough to comp...

Liu, Xiaoping; Vlasov, Yurii A; Green, William M J

2010-01-01T23:59:59.000Z

43

Fabrication of surface plasmon waveguides and integrated components on Cytop  

Science Conference Proceedings (OSTI)

The fabrication and physical characterisation of waveguides and integrated components on Cytop are described. The waveguides consist of a thin narrow Au stripe, on an optically infinite layer of Cytop. The integrated components implemented with this ... Keywords: Cytop, Fabrication, Long-range, Plasmon, Waveguide

Richard Daviau; Asad Khan; Ewa Lisicka-Skrzek; R. Niall Tait; Pierre Berini

2010-10-01T23:59:59.000Z

44

DIELECTRIC-LOADED WAVE-GUIDES  

DOE Patents (OSTI)

This patent presents a particular arrangement for delectric loading of a wave-guide carrying an electromagnetic wave in the E or TM mode of at least the second order, to reduce the power dissipated as the result of conduction loss in the wave-guide walls. To achieve this desirabie result, the effective dielectric constants in the radial direction of adjacent coaxial tubular regions bounded approximateiy by successive nodai surfaces within the electromagnetic field are of two different values alternating in the radial direction, the intermost and outermost regions being of the lower value, and the dielectric constants between nodes are uniform.

Robertson-Shersby-Harvie, R.B.; Mullett, L.B.

1957-04-23T23:59:59.000Z

45

Integrated optical tamper sensor with planar waveguide  

DOE Patents (OSTI)

A monolithic optical tamper sensor, comprising an optical emitter and detector, connected by an optical waveguide and placed into the critical entry plane of an enclosed sensitive region, the tamper sensor having a myriad of scraps of a material optically absorbent at the wavelength of interest, such that when the absorbent material is in place on the waveguide, an unique optical signature can be recorded, but when entry is attempted into the enclosed sensitive region, the scraps of absorbent material will be displaced and the optical/electrical signature of the tamper sensor will change and that change can be recorded.

Carson, R.F.; Casalnuovo, S.A.

1993-01-05T23:59:59.000Z

46

Compact waveguide power divider with multiple isolated outputs  

DOE Patents (OSTI)

The waveguide power divider comprises an input waveguide of rectangular cross-section coupled to multiple reduced height output waveguides of rectangular cross-section. The input is coupled to the output waveguides by axial slots. The length of the slots is selected such that the wave direction of the input waveguide is preserved in the output waveguides. The width of the output guide is equal to the width of the input waveguide so that the input and output guides have the same cutoff wavelength. Waves will then travel with the same phase velocity in the input and output guides. The unused ends of the input and output guides are terminated in matched loads. The load at the end of the input guide absorbs power that is not coupled to the output guides.

Moeller, C.P.

1986-05-27T23:59:59.000Z

47

Waveguide mode converter and method using same  

DOE Patents (OSTI)

A waveguide mode converter converts electromagnetic power being transmitted in a TE.sub.0n or a TM.sub.0n mode, where n is an integer, to an HE.sub.11 mode. The conversion process occurs in a single stage without requiring the power to pass through any intermediate modes. The converter comprises a length of circular corrugated waveguide formed in a multiperiod periodic curve. The period of the curve is selected to couple the desired modes and decouple undesired modes. The corrugation depth is selected to control the phase propagation constant, or wavenumbers, of the input and output modes, thereby preventing coherent coupling to competing modes. In one embodiment, both the period and amplitude of the curve may be selectively adjusted, thereby allowing the converter to be tuned to maximize the conversion efficiency.

Moeller, Charles P. (Del Mar, CA)

1990-01-01T23:59:59.000Z

48

Combination ring cavity and backward Raman waveguide amplifier  

DOE Patents (OSTI)

A combination regenerative ring and backward Raman waveguide amplifier and a combination regenerative ring oscillator and backward Raman waveguide amplifier which produce Raman amplification, pulse compression, and efficient energy extraction from the CO/sub 2/ laser pump signal for conversion into a Stokes radiation signal. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman waveguide amplifier. The backward Raman waveguide amplifier configuration extracts a major portion of the remaining energy from the CO/sub 2/ laser pump signal for conversion to Stokes radiation.

Kurnit, N.A.

1981-03-13T23:59:59.000Z

49

Continuous Nonlinear Programming Techniques to Solve Scheduling Problems  

Science Conference Proceedings (OSTI)

One of the most known applications of Discrete Optimization is on scheduling. In contrast, one of the most known applications of Continuous Nonlinear Optimization is on the control of dynamic systems. In this paper, we combine both views, solving scheduling ... Keywords: nonlinear programming, optimal control, scheduling

Fabio D. Fagundez; Adilson E. Xavier; Joao L. D. Faco

2009-04-01T23:59:59.000Z

50

Combination ring cavity and backward Raman waveguide amplifier  

DOE Patents (OSTI)

A combination regenerative ring and backward Raman waveguide amplifier and a combination regenerative ring oscillator and backward Raman waveguide amplifier which produce Raman amplification, pulse compression, and efficient energy extraction from the CO.sub.2 laser pump signal for conversion into a Stokes radiation signal. The ring cavity configuration allows the CO.sub.2 laser pump signal and Stokes signal to copropagate through the Raman waveguide amplifier. The backward Raman waveguide amplifier configuration extracts a major portion of the remaining energy from the CO.sub.2 laser pump signal for conversion to Stokes radiation. Additionally, the backward Raman amplifier configuration produces a Stokes radiation signal which has a high intensity and a short duration. Adjustment of the position of overlap of the Stokes signal and the CO.sub.2 laser pump signal in the backward Raman waveguide amplifiers alters the amount of pulse compression which can be achieved.

Kurnit, Norman A. (Santa Fe, NM)

1983-01-01T23:59:59.000Z

51

WAVE DELAYING STRUCTURE FOR RECTANGULAR WAVE-GUIDES  

DOE Patents (OSTI)

This patent relates to wave-guides and in particular describes wave delaying structure located within a wave-guide. The disclosed wave-guide has an elongated fiat metal sheet arranged in a central plane of the guide and formed with a series of transverse inductive slots such that each face presents an inductive impedance to the guide. The sheet is thickened in the area between slots to increase the self capacity of the slots. Experimental results indicate that in a wave-guide loaded in accordance with the invention the guided wavelength changes more slowly as the air wavelength is changed than the guided wavelength does in wave-guides loaded by means of corrugations.

Robertson-Shersby-Harvie, R.B.; Dain, J.

1956-11-13T23:59:59.000Z

52

Solving Large Scale Nonlinear Eigenvalue Problem in Next-Generation Accelerator Design  

SciTech Connect

A number of numerical methods, including inverse iteration, method of successive linear problem and nonlinear Arnoldi algorithm, are studied in this paper to solve a large scale nonlinear eigenvalue problem arising from finite element analysis of resonant frequencies and external Q{sub e} values of a waveguide loaded cavity in the next-generation accelerator design. They present a nonlinear Rayleigh-Ritz iterative projection algorithm, NRRIT in short and demonstrate that it is the most promising approach for a model scale cavity design. The NRRIT algorithm is an extension of the nonlinear Arnoldi algorithm due to Voss. Computational challenges of solving such a nonlinear eigenvalue problem for a full scale cavity design are outlined.

Liao, Ben-Shan; Bai, Zhaojun; /UC, Davis; Lee, Lie-Quan; Ko, Kwok; /SLAC

2006-09-28T23:59:59.000Z

53

Nonlinear Lattice Dynamics of Bose-Einstein Condensates  

E-Print Network (OSTI)

The Fermi-Pasta-Ulam (FPU) model, which was proposed 50 years ago to examine thermalization in non-metallic solids and develop ``experimental'' techniques for studying nonlinear problems, continues to yield a wealth of results in the theory and applications of nonlinear Hamiltonian systems with many degrees of freedom. Inspired by the studies of this seminal model, solitary-wave dynamics in lattice dynamical systems have proven vitally important in a diverse range of physical problems--including energy relaxation in solids, denaturation of the DNA double strand, self-trapping of light in arrays of optical waveguides, and Bose-Einstein condensates (BECs) in optical lattices. BECS, in particular, due to their widely ranging and easily manipulated dynamical apparatuses--with one to three spatial dimensions, positive-to-negative tuning of the nonlinearity, one to multiple components, and numerous experimentally accessible external trapping potentials--provide one of the most fertile grounds for the analysis of solitary waves and their interactions. In this paper, we review recent research on BECs in the presence of deep periodic potentials, which can be reduced to nonlinear chains in appropriate circumstances. These reductions, in turn, exhibit many of the remarkable nonlinear structures (including solitons, intrinsic localized modes, and vortices) that lie at the heart of the nonlinear science research seeded by the FPU paradigm.

Mason A. Porter; R. Carretero-González; P. G. Kevrekidis; Boris A. Malomed

2004-09-13T23:59:59.000Z

54

Thermalized polarization dynamics of a discrete optical waveguide system with four-wave mixing  

E-Print Network (OSTI)

Statistical mechanics of two coupled vector fields is studied in the tight-binding model that describes propagation of polarized light in discrete waveguides in the presence of the four-wave mixing. The energy and power conservation laws enable the formulation of the equilibrium properties of the polarization state in terms of the Gibbs measure with positive temperature. The transition line $T=\\infty$ is established beyond which the discrete vector solitons are created. Also in the limit of the large nonlinearity an analytical expression for the distribution of Stokes parameters is obtained which is found to be dependent only on the statistical properties of the initial polarization state and not on the strength of nonlinearity. The evolution of the system to the final equilibrium state is shown to pass through the intermediate stage when the energy exchange between the waveveguides is still negligible. The distribution of the Stokes parameters in this regime has a complex multimodal structure strongly dependent on the nonlinear coupling coefficients and the initial conditions.

S. A. Derevyanko

2013-07-11T23:59:59.000Z

55

Quasi-phase matching and quantum control of high harmonic generation in waveguides using counterpropagating beams  

DOE Patents (OSTI)

All-optical quasi-phase matching (QPM) uses a train of counterpropagating pulses to enhance high-order harmonic generation (HHG) in a hollow waveguide. A pump pulse enters one end of the waveguide, and causes HHG in the waveguide. The counterpropagation pulses enter the other end of the waveguide and interact with the pump pulses to cause QPM within the waveguide, enhancing the HHG.

Zhang, Xiaoshi (Superior, CO); Lytle, Amy L. (Boulder, CO); Cohen, Oren (Boulder, CO); Kapteyn, Henry C. (Boulder, CO); Murnane, Margaret M. (Boulder, CO)

2010-11-09T23:59:59.000Z

56

Stokes injected Raman capillary waveguide amplifier  

DOE Patents (OSTI)

A device for producing stimulated Raman scattering of CO.sub.2 laser radiation by rotational states in a diatomic molecular gas utilizing a Stokes injection signal. The system utilizes a cryogenically cooled waveguide for extending focal interaction length. The waveguide, in conjunction with the Stokes injection signal, reduces required power density of the CO.sub.2 radiation below the breakdown threshold for the diatomic molecular gas. A Fresnel rhomb is employed to circularly polarize the Stokes injection signal and CO.sub.2 laser radiation in opposite circular directions. The device can be employed either as a regenerative oscillator utilizing optical cavity mirrors or as a single pass amplifier. Additionally, a plurality of Raman gain cells can be staged to increase output power magnitude. Also, in the regenerative oscillator embodiment, the Raman gain cell cavity length and CO.sub.2 cavity length can be matched to provide synchronism between mode locked CO.sub.2 pulses and pulses produced within the Raman gain cell.

Kurnit, Norman A. (Santa Fe, NM)

1980-01-01T23:59:59.000Z

57

Resonant Wave Interactions in the Equatorial Waveguide  

Science Conference Proceedings (OSTI)

Weakly nonlinear interactions among equatorial waves have been explored in this paper using the adiabatic version of the equatorial ?-plane primitive equations in isobaric coordinates. Assuming rigid lid vertical boundary conditions, the ...

Carlos F. M. Raupp; Pedro L. Silva Dias; Esteban G. Tabak; Paul Milewski

2008-11-01T23:59:59.000Z

58

Quantitative study of rectangular waveguide behavior in the THz.  

SciTech Connect

This report describes our efforts to quantify the behavior of micro-fabricated THz rectangular waveguides on a configurable, robust semiconductor-based platform. These waveguides are an enabling technology for coupling THz radiation directly from or to lasers, mixers, detectors, antennas, and other devices. Traditional waveguides fabricated on semiconductor platforms such as dielectric guides in the infrared or co-planar waveguides in the microwave regions, suffer high absorption and radiative losses in the THz. The former leads to very short propagation lengths, while the latter will lead to unwanted radiation modes and/or crosstalk in integrated devices. This project exploited the initial developments of THz micro-machined rectangular waveguides developed under the THz Grand Challenge Program, but instead of focusing on THz transceiver integration, this project focused on exploring the propagation loss and far-field radiation patterns of the waveguides. During the 9 month duration of this project we were able to reproduce the waveguide loss per unit of length in the waveguides and started to explore how the loss depended on wavelength. We also explored the far-field beam patterns emitted by H-plane horn antennas attached to the waveguides. In the process we learned that the method of measuring the beam patterns has a significant impact on what is actually measured, and this may have an effect on most of the beam patterns of THz that have been reported to date. The beam pattern measurements improved significantly throughout the project, but more refinements of the measurement are required before a definitive determination of the beam-pattern can be made.

Rowen, Adam M.; Nordquist, Christopher Daniel; Wanke, Michael Clement

2009-10-01T23:59:59.000Z

59

Abrupt coupling between strongly dissimilar waveguides with 100% transmission  

E-Print Network (OSTI)

We present numerical experiments showing how coupled-mode theory can be systematically applied to join very dissimilar photonic crystal waveguides with 100% transmission. Our approach relies on appropriately tuning the ...

Kurs, Andre B.

60

Waveguide-integrated electroluminescent carbon nanotubes  

E-Print Network (OSTI)

Carbon based optoelectronic devices promise to revolutionize modern integrated circuits by combining outstanding electrical and optical properties into a unified technology. By coupling nanoelectronic devices to nanophotonic structures functional components such as nanoscale light emitting diodes, narrow-band thermal emitters, cavity controlled detectors and wideband electro optic modulators can be realized for chipscale information processing. These devices not only allow the light-matter interaction of low-dimensional systems to be studied, but also provide fundamental building blocks for high bandwidth on-chip communication. Here we demonstrate how light from an electrically-driven carbon-nanotube can be coupled directly into a photonic waveguide architecture. We realize wafer scale, broadband sources integrated with nanophotonic circuits allowing for propagation of light over centimeter distances. Moreover, we show that the spectral properties of the emitter can be controlled directly on chip with passive...

Khasminskaya, Svetlana; Flavel, Benjamin S; Pernice, Wolfram H P; Krupke, Ralph

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Optical pumping in a whispering-mode optical waveguide  

DOE Patents (OSTI)

A device and method for optical pumping in a whispering mode optical waveguide are described. Both a helical ribbon and cylinder are disclosed which incorporate an additional curvature for confining the beam to increase intensity. An optical pumping medium is disposed in the optical path of the beam as it propagates along the waveguide. Optical pumping is enhanced by the high intensities of the beam and long interaction path lengths which are achieved in a small volume.

Kurnit, N.A.

1981-08-11T23:59:59.000Z

62

View-Augmented Abstractions  

Science Conference Proceedings (OSTI)

This paper introduces view-augmented abstractions, which specialize an underlying numeric domain to focus on a particular expression or set of expressions. A view-augmented abstraction adds a set of materialized views to the original domain. View augmentation ... Keywords: Numeric abstract domains, abstract-interpretation precision, view maintenance

Matt Elder; Denis Gopan; Thomas Reps

2010-10-01T23:59:59.000Z

63

A Non-Pyramidal Rectangular-to-Trough Waveguide Transition and Pattern Reconfigurable Trough Waveguide Antenna  

E-Print Network (OSTI)

Trough waveguides (TWG) have been utilized in a variety of radio frequency (RF) and other related applications including radar, the treatment of hypothermia and in the generation of plasmas. Perturbing the guided wave in these structures with blocks, rods, dielectrics, and other structures can create reconfigurable periodic line sources. These trough waveguide antennas (TWA) are then capable of providing both fixedfrequency and frequency-dependent beam steering. This was originally performed using electro-mechanical “cam-and-gear” mechanisms. Previous work related to the excitation of TWG and the performance of TWA topologies are limited when compared to more common antenna designs, yet they possess many desirable features that can be exploited in a modern system. This thesis will examines an S-band rectangular-to-trough waveguide transition and trough guide antenna that has been designed for broadband reconfigurable antenna applications considering as well the airflow characteristics for sensing applications. The design, fabrication, and electromagnetic performance (mode conversion, impedance matching, and antenna performance) are discussed, including the use of metallic cantilever perturbations placed along the troughguide sidewalls that are designed to provide improved impedance matching when steering the beam from the backward quadrant through broadside, towards the forward quadrant. Impedance matching techniques such as use of circular holes at the edge of each actuated cantilever are used to reduce power reflections and provide a low voltage standing wave ratio (VSWR) along the S-band. Finite element simulations will provide a demonstration of the airflow and turbulence characteristics throughout the entire structure, where the metallic cantilevers are used to manipulate the flow of air, to distribute it across the surfaces of the structure better and improve its potential for sensing operations.

Loizou, Loizos

2010-12-01T23:59:59.000Z

64

Waveguide detection of right-angle-scattered light in flow cytometry  

DOE Patents (OSTI)

A transparent flow cell is used as an index-guided optical waveguide. A detector for the flow cell but not the liquid stream detects the Right-Angle-Scattered (RAS) Light exiting from one end of the flow cell. The detector(s) could view the trapped RAS light from the flow cell either directly or through intermediate optical light guides. If the light exits one end of the flow cell, then the other end of the flow cell can be given a high-reflectivity coating to approximately double the amount of light collected. This system is more robust in its alignment than the traditional flow cytometry systems which use imaging optics, such as microscope objectives.

Mariella, Jr., Raymond P. (Danville, CA)

2000-01-01T23:59:59.000Z

65

From Maxwell Stresses to Nonlinear Field Equations  

E-Print Network (OSTI)

This paper aims to show that making use of Newton's view on equations of motion of a physical system and of the Maxwell stress tensor we come to a natural nonlinearization of Maxwell equations in vacuum making use only of nonrelativistic terms. The new equations include all Maxwell solutions plus new ones, among which one may find time-stable and spatially finite ones with photon-like properties and behavior.

Donev, S; Donev, Stoil; Tashkova, Maria

2006-01-01T23:59:59.000Z

66

From Maxwell Stresses to Nonlinear Field Equations  

E-Print Network (OSTI)

This paper aims to show that making use of Newton's view on equations of motion of a physical system and of the Maxwell stress tensor we come to a natural nonlinearization of Maxwell equations in vacuum making use only of nonrelativistic terms. The new equations include all Maxwell solutions plus new ones, among which one may find time-stable and spatially finite ones with photon-like properties and behavior.

Stoil Donev; Maria Tashkova

2006-04-04T23:59:59.000Z

67

Stationary nonlinear Airy beams  

Science Conference Proceedings (OSTI)

We demonstrate the existence of an additional class of stationary accelerating Airy wave forms that exist in the presence of third-order (Kerr) nonlinearity and nonlinear losses. Numerical simulations and experiments, in agreement with the analytical model, highlight how these stationary solutions sustain the nonlinear evolution of Airy beams. The generic nature of the Airy solution allows extension of these results to other settings, and a variety of applications are suggested.

Lotti, A. [Dipartimento di Fisica e Matematica, Universita del'Insubria, Via Valleggio 11, I-22100 Como (Italy); Centre de Physique Theorique, CNRS, Ecole Polytechnique, F-91128 Palaiseau (France); Faccio, D. [Dipartimento di Fisica e Matematica, Universita del'Insubria, Via Valleggio 11, I-22100 Como (Italy); School of Engineering and Physical Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Couairon, A. [Centre de Physique Theorique, CNRS, Ecole Polytechnique, F-91128 Palaiseau (France); Papazoglou, D. G. [Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology, Hellas (FORTH), P.O. Box 1527, GR-71110 Heraklion (Greece); Materials Science and Technology Department, University of Crete, GR-71003 Heraklion (Greece); Panagiotopoulos, P.; Tzortzakis, S. [Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology, Hellas (FORTH), P.O. Box 1527, GR-71110 Heraklion (Greece); Abdollahpour, D. [Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology, Hellas (FORTH), P.O. Box 1527, GR-71110 Heraklion (Greece); Physics Department, University of Crete, GR-71003 Heraklion (Greece)

2011-08-15T23:59:59.000Z

68

Interaction of Independent Single Photons based on Integrated Nonlinear Optics  

E-Print Network (OSTI)

Photons are ideal carriers of quantum information, as they can be easily created and can travel long distances without being affected by decoherence. For this reason, they are well suited for quantum communication. However, the interaction between single photons is negligible under most circumstances. Realising such an interaction is not only fundamentally fascinating but holds great potential for emerging technologies. It has recently been shown that even weak optical nonlinearities between single photons can be used to perform important quantum communication tasks more efficiently than methods based on linear optics, which have fundamental limitations. Nonlinear optical effects at single photon levels in atomic media have been studied and demonstrated but these are neither flexible nor compatible with quantum communication as they impose restrictions on photons' wavelengths and bandwidths. Here we use a high efficiency nonlinear waveguide to observe the sum-frequency generation between a single photon and a single-photon level coherent state from two independent sources. The use of an integrated, room-temperature device and telecom wavelengths makes this approach to photon-photon interaction well adapted to long distance quantum communication, moving quantum nonlinear optics one step further towards complex quantum networks and future applications such as device independent quantum key distribution.

Thiago Guerreiro; Enrico Pomarico; Bruno Sanguinetti; Nicolas Sangouard; J. S. Pelc; C. Langrock; M. M. Fejer; Hugo Zbinden; Robert T. Thew; Nicolas Gisin

2013-04-12T23:59:59.000Z

69

Nonlinear Optimization Test  

E-Print Network (OSTI)

Jun 8, 2000 ... Nonlinear Optimization Test Goux Jean-Pierre Abstract : this is my abstract. Keywords : this are keywords. Citation: : this is a citation. Download ...

70

Monolithically integrated solid state laser and waveguide using spin-on glass  

DOE Patents (OSTI)

A monolithically integrated photonic circuit combining a semiconductor source of excitation light with an optically active waveguide formed on the substrate. The optically active waveguide is preferably formed of a spin-on glass to which are added optically active materials which can enable lasing action, optical amplification, optical loss, or frequency conversion in the waveguide, depending upon the added material.

Ashby, Carol I. H. (Edgewood, NM); Hohimer, John P. (Albuquerque, NM); Neal, Daniel R. (Tijeras, NM); Vawter, G. Allen (Albuquerque, NM)

1995-01-01T23:59:59.000Z

71

Propagation of nonlinear waves in waveguides and application to nondestructive stress measurement  

E-Print Network (OSTI)

to Gary Carr, Chief of Rail Research Division of FRA, forresearch  and  provides  statistics  and  historical  background  on  continuous  welded  rails  and Research motivation With  the  advent  of  Continuous-Welded  Rail  (

Nucera, Claudio

2012-01-01T23:59:59.000Z

72

Nonlinear Baroclinic Adjustment  

Science Conference Proceedings (OSTI)

The concept of baroclinic adjustment is reexamined in the context of a fully nonlinear two-layer model on a ?-plane. Based on our results we propose a single, conceptually very simple mechanism of the nonlinear equilibration of waves and the mean ...

Priscilla Cehelsky; Ka Kit Tung

1991-09-01T23:59:59.000Z

73

Ring cavity for a Raman capillary waveguide amplifier  

DOE Patents (OSTI)

Disclosed is a regenerative ring amplifier and regenerative ring oscillator which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO[sub 2] laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplifier Stokes signal is synchronous with the mode-locked spikes of the incoming CO[sub 2] laser pump signal. 6 figs.

Kurnit, N.A.

1983-07-19T23:59:59.000Z

74

Ring cavity for a Raman capillary waveguide amplifir  

DOE Patents (OSTI)

A regenerative ring amplifier and regenerative ring oscillator are described which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplified Stokes signal is synchronous with the mode-locked spikes of the incoming CO/sub 2/ laser pump signal.

Kurnit, N.A.

1981-01-27T23:59:59.000Z

75

Ring cavity for a Raman capillary waveguide amplifier  

DOE Patents (OSTI)

A regenerative ring amplifier and regenerative ring oscillator are described which function to feed back a portion of the Stokes signal to complete the ring cavity. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman capillary waveguide amplifier. A Raman capillary waveguide amplifier is also provided in the return leg of the ring cavity to increase gain without increasing the round trip time. Additionally, the ring cavity can be designed such that the amplified Stokes signal is synchronous with the mode-locked spikes of the incoming CO/sub 2/ laser pump signal.

Kurnit, N.A.

1981-01-27T23:59:59.000Z

76

Transmission characteristics of circular metallic waveguides for terahertz radiation  

SciTech Connect

Transmission characteristics of oversized circular metallic waveguides excited by linearly polarised Gaussian laser beams in the terahertz range (4 - 28 THz) are studied theoretically and experimentally. Calculating the transmission characteristics, we have determined the conditions of applicability of the method of the eigenoscillations in the approximations of a real metal by an ideal metal or dielectric, depending on the transmitted radiation frequency. The existence of the transition region is established in the behaviour of the electrodynamic properties of metallic waveguides in the frequency range of 7.5 - 15 THz.

Volodenko, A V; Gurin, O V; Degtyarev, A V; Maslov, Vyacheslav A; Svich, V A; Senyuta, V S; Topkov, A N [V.N. Karazin Kharkov National University, Kharkov (Ukraine)

2011-09-30T23:59:59.000Z

77

Electromagnetic Transition in Waveguide with Application to Lasers  

E-Print Network (OSTI)

The electromagnetic transition of two-level atomic systems in a waveguide is calculated. Compared with the result in free space, the spontaneous emission rate decrease because the phase space is smaller, and meanwhile, some resonance appears in some cases. Moreover, the influence of non-uniform electromagnetic field in a waveguide on absorption and stimulated emission is considered. Applying the results to lasers, a method to enhance the laser power is proposed. PACS codes: 42.50.ct, 42.55.Ah 1

unknown authors

2002-01-01T23:59:59.000Z

78

Cutoff-mesa isolated rib optical waveguide for III-V heterostructure photonic integrated circuits  

DOE Patents (OSTI)

A cutoff mesa rib waveguide provides single-mode performance regardless of any deep etches that might be used for electrical isolation between integrated electrooptic devices. Utilizing a principle of a cutoff slab waveguide with an asymmetrical refractive index profile, single mode operation is achievable with a wide range of rib widths and does not require demanding etch depth tolerances. This new waveguide design eliminates reflection effects, or self-interference, commonly seen when conventional rib waveguides are combined with deep isolation etches and thereby reduces high order mode propagation and crosstalk compared to the conventional rib waveguides.

Vawter, Gregory A. (Albuquerque, NM); Smith, Robert E. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

79

User_ViewRecords  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

User Records User Records © 2011 SuccessFactors, Inc. - 1 - SuccessFactors Learning Confidential. All rights reserved. Job Aid: Viewing User Records Purpose The purpose of this job aid is to guide users through the step-by-step process of viewing their records. Each task demonstrates viewing of different records. Task A. View To-Do List Enter the web address (URL) of the user application into your browser Address field and press the Enter key. Enter your user ID in the User ID textbox. Enter your password in the Password textbox. Click Sign In. View To-Do List (filter, view) 7 Steps Task A View Completed Work 8 Steps Task B View Curriculum Status and Details 11 Steps Task C 3 3 1 2 2 1 SuccessFactors Learning v 6.4 User Job Aid Viewing User Records

80

Coupling to the fast wave via a phased waveguide array  

SciTech Connect

A dielectric-loaded waveguide array has been used to launch fast waves into a plasma in which ..omega../sup pi/ < ..omega.. << ..omega../sub pe/ approx. ..omega../sub ce/. The wave propagates when accessibility and cutoff requirements are satisfied. Reflection coefficients as low as 1% have been measured. Use of the fast wave for steady-state current drive is suggested.

Olson, L.; McWilliams, R.; Glanz, J.; Motley, R.W.

1984-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Transactional process views  

Science Conference Proceedings (OSTI)

To enable effective interorganisational collaborations, process providers have to disclose relevant parts of their local business processes in public process views. A public process view has to be consistent with the underlying private process. Local ...

Rik Eshuis; Jochem Vonk; Paul Grefen

2011-10-01T23:59:59.000Z

82

Nonlinear magnetoinductive transmission lines  

E-Print Network (OSTI)

Power transmission in one-dimensional nonlinear magnetic metamaterials driven at one end is investigated numerically and analytically in a wide frequency range. The nonlinear magnetic metamaterials are composed of varactor-loaded split-ring resonators which are coupled magnetically through their mutual inductances, forming thus a magnetoiductive transmission line. In the linear limit, significant power transmission along the array only appears for frequencies inside the linear magnetoinductive wave band. We present analytical, closed form solutions for the magnetoinductive waves transmitting the power in this regime, and their discrete frequency dispersion. When nonlinearity is important, more frequency bands with significant power transmission along the array may appear. In the equivalent circuit picture, the nonlinear magnetoiductive transmission line driven at one end by a relatively weak electromotive force, can be modeled by coupled resistive-inductive-capacitive (RLC) circuits with voltage-dependent cap...

Lazarides, Nikos; Tsironis, G P

2011-01-01T23:59:59.000Z

83

Nonlinear Quantum Gravity  

E-Print Network (OSTI)

Nonlinear quantum mechanics at the Planck scale can produce nonlocal effects contributing to resolution of singularities, to cosmic acceleration, and modified black-hole dynamics, while avoiding the usual causality issues.

George Svetlichny

2006-02-01T23:59:59.000Z

84

Nonlinear Midlatitude Ocean Adjustment  

Science Conference Proceedings (OSTI)

Ocean adjustment on annual to interdecadal scales to variable forcing is considered for a more nonlinear general circulation than has previously been studied. The nature of the response is a strong function of forcing frequency and importantly ...

William K. Dewar

2003-05-01T23:59:59.000Z

85

View - Optimization Online  

E-Print Network (OSTI)

accuracy and v(xk) is not sufficiently small, or if the new constraint violation satisfies ...... RRR 12-94, Rutgers University, New Brunswick, NJ, USA. ... Nonlinear Optimization, Technical Report, Rutherford Appleton Laboratory, Chilton, Ox-.

86

Vector Network Analyzer Techniques to measure WR340 Waveguide Windows  

NLE Websites -- All DOE Office Websites (Extended Search)

6 6 Vector Network Analyzer Techniques to Measure WR340 Waveguide Windows T. L. Smith ASD / RF Group Advanced Photon Source Argonne National Laboratory June 26, 2002 Table of Contents 1) Introduction 2) Objective 3) Full Two-Port Calibration 4) TRL (Thru-Reflect-Line) 5) TRL / WR340 Waveguide Window Measurement 6) Conclusions 7) References 1. Introduction In its fundamental form, network analysis involves the measurement of incident, reflected, and transmitted waves that travel along transmission lines. Measuring both magnitude and phase of components is important for several reasons. First, both measurements are required to fully characterize a linear network and ensure distortion- free transmission. To design effective matching networks, complex impedances must be

87

High power windows for WR650 waveguide couplers  

Science Conference Proceedings (OSTI)

Based on the robust, pre-stressed planar window concept successfully tested for PEP II and LEDA, a new design for planar ceramic windows to be used with WR650 waveguide fundamental power couplers at 1300 MHz or 1500 MHz has been developed. These windows should operate in pulsed or CW mode and sustain at least 100 kW average power levels. This paper describes an overview of the simulations performed to match the ceramics in WR650 waveguides, design details, as well as the RF measurements and performance assessed by RF power tests on several high power windows manufactured at JLAB. Funding Agency: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177, and by The Office of Naval Research under contract to the Dept. of Energy.

Mircea Stirbet; Robert Rimmer; Thomas Elliott; Edward Daly; Katherine Wilson; Lynn Vogel; Haipeng Wang; Brian Carpenter; Karl Smith; Thomas Powers; Michael Drury; Robert Nichols; G. Davis

2007-06-01T23:59:59.000Z

88

Method of fabricating optical waveguides by ion implantation doping  

DOE Patents (OSTI)

A method for fabricating high-quality optical waveguides in optical quality oxide crystals by ion implantation doping and controlled epitaxial recrystallization is provided. Masked LiNbO/sub 3/ crystals are implanted with high concentrations of Ti dopant at ion energies of about 360 keV while maintaining the crystal near liquid nitrogen temperature. Ion implantation doping produces an amorphous, Ti-rich nonequilibrium phase in the implanted region. Subsequent thermal annealing in a water-saturated oxygen atmosphere at up to 1000/degree/C produces solid-phase epitaxial regrowth onto the crystalline substrate. A high-quality crystalline layer results which incorporates the Ti into the crystal structure at much higher concentrations than is possible by standard diffusion techniques, and this implanted region has excellent optical waveguiding properties.

Appleton, B.R.; Ashley, P.R.; Buchal, C.J.

1987-03-24T23:59:59.000Z

89

Design and modelling of novel waveguide and light-emitting-diode-based photoreactors.  

E-Print Network (OSTI)

??In this dissertation, investigations on a range of photocatalytic reactors based on waveguides (optical fibres and quartz tubes) are presented. A study on a coupled… (more)

Denny, Frans

2010-01-01T23:59:59.000Z

90

The Spectrum of High-Frequency Internal Waves in the Atmospheric Waveguide  

Science Conference Proceedings (OSTI)

The vertical structure and power spectrum of the field of internal waves generated in the atmospheric waveguide by random vertical displacements were considered in this paper.

I. P. Chunchuzov

1996-07-01T23:59:59.000Z

91

Compact Probe for Power Detection from the Narrow Side of the Waveguide  

SciTech Connect

Phased array antennas with high directivity have a variety of applications. One of their applications is in RF heating for magnetically confined plasma fusion research. Among these RF heating schemes, waveguide arrays with careful phase control on each waveguide can act as a phased array antenna to deliver megawatts of power for heating fusion plasmas in the lower-hybrid range of frequencies (1 GHz-10 GHz). In order to achieve compactness, it is common to stack reduced height waveguide together to form the waveguide array. As long as the delivered power does not cause arcing in the waveguide, the waveguide height can be quite small. Due to this confined space in a stack of reduced height waveguides, power detection of the incident and reflected wave in the reduced height waveguide is extremely difficult. A new compact probe, which employs current loops, to monitor the incident and reflected wave from the narrow side of the reduced height waveguide has been developed. Its theory and performance will be reported in this paper.

C.C. Kung; S. Bernabei; J. Gumbas; N. Greenough; E. Fredd; J.R. Wilson; J. Hosea

2004-05-07T23:59:59.000Z

92

Quantum Statistics of Surface Plasmon Polaritons in Metallic Stripe Waveguides  

E-Print Network (OSTI)

Single surface plasmon polaritons are excited using photons generated via spontaneous parametric down-conversion. The mean excitation rates, intensity correlations and Fock state populations are studied. The observed dependence of the second order coherence in our experiment is consistent with a linear uncorrelated Markovian environment in the quantum regime. Our results provide important information about the effect of loss for assessing the potential of plasmonic waveguides for future nanophotonic circuitry in the quantum regime.

Giuliana Di Martino; Yannick Sonnefraud; Stéphane Kéna-Cohen; Mark Tame; ?ahin K. Özdemir; M. S. Kim; Stefan A. Maier

2012-04-06T23:59:59.000Z

93

Waveguide and loop coupling to fast MHD toroidal eigenmodes  

SciTech Connect

Heating of plasmas by wave techniques requires an effective method of coupling rf energy to the plasma. In cavities the presence of weakly damped eigenmodes will enhance the loading of antennas when the wave frequency equals an eigenmode frequency. This report considers two methods of coupling to fast MHD eigenmodes in a toroidal cavity: one is by a waveguide mounted perpendicular to the vacuum vessel wall; and the other by a loop placed within the cavity. (auth)

Paoloni, F.J.

1975-12-01T23:59:59.000Z

94

Ultracompact Vanadium Dioxide Dual-Mode Plasmonic Waveguide Electroabsorption Modulator  

E-Print Network (OSTI)

Subwavelength modulators play an indispensable role in integrated photonic-electronic circuits. Due to weak light-matter interactions, it is always a challenge to develop a modulator with a nanometer scale footprint, low switching energy, low insertion loss and large modulation depth. In this paper, we propose the design of a vanadium dioxide dual-mode plasmonic waveguide electroabsorption modulator using a metal-insulator-VO$_2$-insulator-metal (MIVIM) waveguide platform. By varying the index of vanadium dioxide, the modulator can route plasmonic waves through the low-loss dielectric insulator layer during the "on" state and high-loss VO$_2$ layer during the "off" state, thereby significantly reducing the insertion loss while maintaining a large modulation depth. This ultracompact waveguide modulator, for example, can achieve a large modulation depth of ~10dB with an active size of only 200x50x220nm$^3$ (or ~{\\lambda}$^3$/1700), requiring a drive-voltage of ~4.6V. This high performance plasmonic modulator co...

Ooi, Kelvin J A; Chu, Hong Son; Ang, Lay Kee

2013-01-01T23:59:59.000Z

95

Piecewise polynomial nonlinear model reduction  

Science Conference Proceedings (OSTI)

We present a novel, general approach towards model-order reduction (MOR) of nonlinear systems that combines good global and local approximation properties. The nonlinear system is first approximated as piecewise polynomials over a number of regions, ...

Ning Dong; Jaijeet Roychowdhury

2003-06-01T23:59:59.000Z

96

Universal nonlinear entanglement witnesses  

Science Conference Proceedings (OSTI)

We give a universal recipe for constructing nonlinear entanglement witnesses able to detect nonclassical correlations in arbitrary systems of distinguishable and/or identical particles for an arbitrary number of constituents. The constructed witnesses are expressed in terms of expectation values of observables. As such, they are, at least in principle, measurable in experiments.

Kotowski, Marcin; Kotowski, Michal [College of Inter-Faculty Individual Studies in Mathematics and Natural Sciences, Warsaw University, PL-Warszawa (Poland); Center for Theoretical Physics, Polish Academy of Sciences, Aleja Lotnikow 32/44, PL-02-668 Warszawa (Poland); Kus, Marek [Center for Theoretical Physics, Polish Academy of Sciences, Aleja Lotnikow 32/44, PL-02-668 Warszawa (Poland)

2010-06-15T23:59:59.000Z

97

Chaos at Nonlinear NMR  

E-Print Network (OSTI)

The hodographs of magnetization of nonlinear nuclear magnetic resonance are investigated in the conditions of resonance on the unshifted frequency. It is shown that, depending on the value of amplitude of the variable field and value of frequency shift, topologically different hodographs separated from each other by separatrix are obtained.

A. Ugulava; S. Chkhaidze; L. Chotorlishvili; Z. Rostomashvili

2009-02-17T23:59:59.000Z

98

Computer modeling of ultrafast all-optical wavelength conversion in silicon nanophotonic waveguides  

Science Conference Proceedings (OSTI)

Wavelength conversion through cross phase modulation in silicon-on-insulator waveguides is simulated through a mathematical model. Results reveal the dominance of the optical Kerr effect for the case of ultrashort pulses. The dependence of the wavelength ... Keywords: Cross phase modulation, SOI waveguides

D. P. Korfiatis; A. D. Kosmatos; K. -A. Th. Thoma; J. C. Vardaxoglou

2009-04-01T23:59:59.000Z

99

Ultra-wideband bandpass filter on coplanar waveguide: Proposal and implementation: Research Articles  

Science Conference Proceedings (OSTI)

In this paper, a novel ultra-wideband (UWB: 3.1 ? 10.6 GHz) bandpass filter on coplanar waveguide (CPW) is presented, designed and implemented. At first, an open-ended nonuniform or multiple-mode resonator with three distinctive sections is constructed ... Keywords: UWB bandpass filter, coplanar waveguide, interdigital capacitor, multiple-mode resonator, ultra-wideband

Jing Gao; Lei Zhu; Wolfgang Menzel; Frank Bögelsack

2007-03-01T23:59:59.000Z

100

Physical modelling and particle swarm design of coplanar waveguide square spiral inductor  

Science Conference Proceedings (OSTI)

This paper presents simple lumped element equivalent circuit for the coplanar waveguide (CPW) square spiral inductor. The circuit is based on physical modelling which takes into consideration the parasitic effects inherent in the CPW spiral inductor. ... Keywords: circuit modelling, coplanar waveguide, inductor, particle swarm optimization

N. I. Dib; J. I. Ababneh

2008-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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101

Nonlinear Noise in Cosmology  

E-Print Network (OSTI)

This paper derives and analyzes exact, nonlocal Langevin equations appropriate in a cosmological setting to describe the interaction of some collective degree of freedom with a surrounding ``environment.'' Formally, these equations are much more general, involving as they do a more or less arbitrary ``system,'' characterized by some time-dependent potential, which is coupled via a nonlinear, time-dependent interaction to a ``bath'' of oscillators with time-dependent frequencies. The analysis reveals that, even in a Markov limit, which can often be justified, the time dependences and nonlinearities can induce new and potentially significant effects, such as systematic and stochastic mass renormalizations and state-dependent ``memory'' functions, aside from the standard ``friction'' of a heuristic Langevin description. One specific example is discussed in detail, namely the case of an inflaton field, characterized by a Landau-Ginsburg potential, that is coupled quadratically to a bath of scalar ``radiation.'' T...

Habib, S; Habib, Salman; Kandrup, Henry E.

1992-01-01T23:59:59.000Z

102

Absorption spectroscopy in hollow-glass waveguides using infrared laser diodes  

Science Conference Proceedings (OSTI)

Hollow-glass waveguides may be a viable technology that, in some cases, may supplant heavier multi-pass cells such as White or Herriott cells for performing trace detection using tunable diode laser absorption spectroscopy. We report here a series of experiments for testing the suitability of waveguides for infrared spectroscopy. The loss characteristics of 1 mm bore diameter waveguides have been measured for straight and coiled lengths. Using direct absorption spectroscopy we have found that the absorption pathlength is approximately equal to the physical length of the waveguide. Broadband FM diode laser spectroscopy produces a comparable signal-to-noise ratio with less than a second of signal averaging. Finally, we have also performed near-infrared spectroscopy of nitrous oxide flowing through a waveguide using a telecommunications diode laser.

Blake, Thomas A.; Kelly, James F.; Stewart, Timothy L.; Hartman, John S.; Sharpe, Steven W.; Sams, Robert L.

2002-07-10T23:59:59.000Z

103

Taking the long view  

NLE Websites -- All DOE Office Websites (Extended Search)

Taking the long view Taking the long view Taking the long view on environmental stewardship A newly articulated mission for environmental stewardship at the Laboratory can be summed up in a simple phrase: clean up the past, control current operations, and create a sustainable future. March 20, 2012 Los Alamos Aerial Aerial view of a canyon in Los Alamos, New Mexico. Contact Environmental Communication & Public Outreach P.O. Box 1663 MS M996 Los Alamos, NM 87545 (505) 667-0216 Email "The future viability of the Lab hinges on demonstrating to public that we protect human health and the environment." Environmental stewardship strategy looks 50 years into the future As a way of integrating environmental protection activities into a comprehensive strategy, Kevin Smith, manager of the U.S. Department of

104

A View from Elsewhere  

E-Print Network (OSTI)

Arcadia Project Review - A View From Elsewhere Tony Hirst Department of Communication and Systems, The Open University a.j.hirst@open.ac.uk Summary This report provides an overview of activities carried out during Michaelmas Term...

Hirst, Tony

2009-01-01T23:59:59.000Z

105

LONGITUDINAL OSCILLATIONS IN DENSITY STRATIFIED AND EXPANDING SOLAR WAVEGUIDES  

Science Conference Proceedings (OSTI)

Waves and oscillations can provide vital information about the internal structure of waveguides in which they propagate. Here, we analytically investigate the effects of density and magnetic stratification on linear longitudinal magnetohydrodynamic (MHD) waves. The focus of this paper is to study the eigenmodes of these oscillations. It is our specific aim to understand what happens to these MHD waves generated in flux tubes with non-constant (e.g., expanding or magnetic bottle) cross-sectional area and density variations. The governing equation of the longitudinal mode is derived and solved analytically and numerically. In particular, the limit of the thin flux tube approximation is examined. The general solution describing the slow longitudinal MHD waves in an expanding magnetic flux tube with constant density is found. Longitudinal MHD waves in density stratified loops with constant magnetic field are also analyzed. From analytical solutions, the frequency ratio of the first overtone and fundamental mode is investigated in stratified waveguides. For small expansion, a linear dependence between the frequency ratio and the expansion factor is found. From numerical calculations it was found that the frequency ratio strongly depends on the density profile chosen and, in general, the numerical results are in agreement with the analytical results. The relevance of these results for solar magneto-seismology is discussed.

Luna-Cardozo, M. [Instituto de Astronomia y Fisica del Espacio, CONICET-UBA, CC. 67, Suc. 28, 1428 Buenos Aires (Argentina); Verth, G. [School of Computing, Engineering and Information Sciences, Northumbria University, Newcastle Upon Tyne NE1 8ST (United Kingdom); Erdelyi, R., E-mail: mluna@iafe.uba.ar, E-mail: robertus@sheffield.ac.uk, E-mail: gary.verth@northumbria.ac.uk [Solar Physics and Space Plasma Research Centre (SP2RC), University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH (United Kingdom)

2012-04-01T23:59:59.000Z

106

Iterations of nonlinear entanglement witnesses  

E-Print Network (OSTI)

We describe a generic way to improve a given linear entanglement witness by a quadratic, nonlinear term. This method can be iterated, leading to a whole sequence of nonlinear witnesses, which become stronger in each step of the iteration. We show how to optimize this iteration with respect to a given state, and prove that in the limit of the iteration the nonlinear witness detects all states that can be detected by the positive map corresponding to the original linear witness.

Tobias Moroder; Otfried Gühne; Norbert Lütkenhaus

2008-06-04T23:59:59.000Z

107

Nonlinear graphene plasmonics: amplitude equation  

E-Print Network (OSTI)

Using perturbation expansion of Maxwell equations, the amplitude equation is derived for nonlinear TM and TE surface plasmon waves supported by graphene. The equation describes interplay between in-plane beam diffraction and nonlinerity due to light intensity induced corrections to graphene conductivity and susceptibility of dielectrics. For strongly localized TM plasmons, graphene is found to bring the superior contribution to the overall nonlinearity. In contrast, nonlinear response of the substrate and cladding dielectrics can become dominant for weakly localized TE plasmons.

Gorbach, A V

2013-01-01T23:59:59.000Z

108

Prarie View RDF  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

PRAIRIE VIEW RDF PRAIRIE VIEW RDF 2 Prairie View RDF  Located at JAAP (approx. 40 miles southwest of Chicago), 223 acres on 455 Acre Parcel  Will County Owner; Waste Management, Operator  Maximum 23-Year Life WM/Will County Methane to Energy Plant  Landfill Contract Signed w/WM in 1997 w/Gas-to- Energy Plant Clause  County Retains Gas Rights &WM Installs Gas Collection System  WM owns Methane to Energy Plant &Tax Credits 3 CONTRACT PHASE  DOE Grant Applied 6/09  County Board Approves DOE EECBG Strategy 11/09  1 Million DOE Funds to Methane to Energy Plant  Schiff Harden Hired to Negotiate Gas to Energy Contract  February 2010 County Board Authorizes Contract Execution 4 5 METHANE TO ENERGY PLANT DETAILS  Waste Management Required To

109

Ground-state Properties of Small-Size Nonlinear Dynamical Lattices  

E-Print Network (OSTI)

We investigate the ground state of a system of interacting particles in small nonlinear lattices with M > 2 sites, using as a prototypical example the discrete nonlinear Schroedinger equation that has been recently used extensively in the contexts of nonlinear optics of waveguide arrays, and Bose-Einstein condensates in optical lattices. We find that, in the presence of attractive interactions, the dynamical scenario relevant to the ground state and the lowest-energy modes of such few-site nonlinear lattices reveals a variety of nontrivial features that are absent in the large/infinite lattice limits: the single-pulse solution and the uniform solution are found to coexist in a finite range of the lattice intersite coupling where, depending on the latter, one of them represents the ground state; in addition, the single-pulse mode does not even exist beyond a critical parametric threshold. Finally, the onset of the ground state (modulational) instability appears to be intimately connected with a non-standard (``double transcritical'') type of bifurcation that, to the best of our knowledge, has not been reported previously in other physical systems.

P. Buonsante; P. Kevrekidis; V. Penna; A. Vezzani

2006-04-14T23:59:59.000Z

110

Ray-based analysis of the interference striation pattern in an underwater acoustic waveguide  

E-Print Network (OSTI)

In some underwater acoustic waveguides with specially selected sound speed profiles striations or fringes of the interference pattern are determined by a single parameter \\beta\\ called the waveguide (or Chuprov) invariant. In the present paper it is shown that an analytical description of fringes may be possible in a waveguide with an arbitrary sound speed profile. A simple analytical expression is obtained for smooth lines formed by local maxima of the interference pattern. This result is valid at long enough ranges. It is derived proceeding from a known relation connecting the differences of ray travel times and the action variables of ray paths.

Virovlyansky, A L

2013-01-01T23:59:59.000Z

111

Integration of a terahertz quantum cascade laser with a hollow waveguide  

DOE Patents (OSTI)

The present invention is directed to the integration of a quantum cascade laser with a hollow waveguide on a chip to improve both the beam pattern and manufacturability. By coupling the QCL output into a single-mode rectangular waveguide the radiation mode structure can be known and the propagation, manipulation, and broadcast of the QCL radiation can then be entirely controlled by well-established rectangular waveguide techniques. By controlling the impedance of the interface, enhanced functions, such as creating amplifiers, efficient coupling to external cavities, and increasing power output from metal-metal THz QCLs, are also enabled.

Wanke, Michael C. (Albuquerque, NM); Nordquist, Christopher D. (Albuquerque, NM)

2012-07-03T23:59:59.000Z

112

ParaView at NERSC  

NLE Websites -- All DOE Office Websites (Extended Search)

ParaView ParaView ParaView Introduction ParaView is an open-source, multi-platform data analysis and visualization application. ParaView users can quickly build visualizations to analyze their data using qualitative and quantitative techniques. The data exploration can be done interactively in 3D or programmatically using ParaView's batch processing capabilities. ParaView was developed to analyze extremely large datasets using distributed memory computing resources. It can be run on supercomputers to analyze datasets of terascale as well as on laptops for smaller data. Remote Visualization with ParaView ParaView is a client-server application. The ParaView client (or simply paraview) will run on your desktop while the server will run at the remote supercomputing site. The following describes the steps you will take to

113

Nonlinear effects in kinetic resolutions  

E-Print Network (OSTI)

The impact of nonlinear effects in the asymmetric catalysis of kinetic resolutions is analyzed. It is found with minimal assumptions that the kinetics of homocompetitive reactions should apply generally to kinetic resolutions involving partially resolved catalysts, and this is supported by experimental observations with the Jacobsen hydrolytic kinetic resolution (HKR) of epoxides. The criterion for a nonlinear effect in asymmetric catalysis--a nonlinear correlation between the enantiomeric excess in a choral ligand and the product enantiomeric excess obtained from a reaction--is examined. The nonlinear effect idea is found to be generalizable to kinetic resolutions and other reactions by replacing consideration of the product enantiomeric excess with the quantity (k[]/k[]-1)/(k[]/k[]+1), a differential kinetic enantiomeric enhancement (DKEE). A nonlinear effect may then be defined by a nonlinear correlation between the DKEE and the chiral ligand enantiomeric excess. The application of these ideas to previously reported kinetic resolutions of sulfoxides and to nonlinear effects in the Jacobsen HKR is described. Relatively small nonlinear effects in kinetic resolutions are sufficient to obtain large asymmetric amplifications. A catalyst modification in the Jacobsen HKR also allows for the development of a novel recyclable system for the iterative enhancement of optical activity.

Johnson, Derrell W.

1999-01-01T23:59:59.000Z

114

Nonlinear Electrodynamics and black holes  

E-Print Network (OSTI)

It is addressed the issue of black holes with nonlinear electromagnetic field, focussing mainly in the Born-Infeld case. The main features of these systems are described, for instance, geodesics, energy conditions, thermodynamics and isolated horizon aspects. Also are revised some black hole solutions of alternative nonlinear electrodynamics and its inconveniences.

Nora Breton; Ricardo Garcia-Salcedo

2007-02-01T23:59:59.000Z

115

Nonlinear integrable ion traps  

Science Conference Proceedings (OSTI)

Quadrupole ion traps can be transformed into nonlinear traps with integrable motion by adding special electrostatic potentials. This can be done with both stationary potentials (electrostatic plus a uniform magnetic field) and with time-dependent electric potentials. These potentials are chosen such that the single particle Hamilton-Jacobi equations of motion are separable in some coordinate systems. The electrostatic potentials have several free adjustable parameters allowing for a quadrupole trap to be transformed into, for example, a double-well or a toroidal-well system. The particle motion remains regular, non-chaotic, integrable in quadratures, and stable for a wide range of parameters. We present two examples of how to realize such a system in case of a time-independent (the Penning trap) as well as a time-dependent (the Paul trap) configuration.

Nagaitsev, S.; /Fermilab; Danilov, V.; /SNS Project, Oak Ridge

2011-10-01T23:59:59.000Z

116

Nonlinear continuous feedback controllers  

E-Print Network (OSTI)

Packet-switched communication networks such as today's Internet are built with several interconnected core and distribution packet forwarding routers and several sender and sink transport agents. In order to maintain stability and avoid congestion collapse in the network, the sources control their rate behavior and voluntarily adjust their sending rates to accommodate other sources in the network. In this thesis, we study one class of sender rate control that is modeled using continuous first-order differential equation of the sending rates. In order to adjust the rates appropriately, the network sends continuous packet-loss feedback to the sources. We study a form of closed-loop feedback congestion controllers whose rate adjustments exhibit a nonlinear form. There are three dimensions to our work in this thesis. First, we study the network optimization problem in which sources choose utilities to maximize their underlying throughput. Each sender maximizes its utility proportional to the throughput achieved. In our model, sources choose a utility function to define their level of satisfaction of the underlying resource usages. The objective of this direction is to establish the properties of source utility functions using inequality constrained bounded sets and study the functional forms of utilities against a chosen rate differential equation. Second, stability of the network and tolerance to perturbation are two essential factors that keep communication networks operational around the equilibrium point. Our objective in this part of the thesis is to analytically understand the existence of local asymptotic stability of delayed-feedback systems under homogeneous network delays. Third, we propose a novel tangential controller for a generic maximization function and study its properties using nonlinear optimization techniques. We develop the necessary theoretical background and the properties of our controller to prove that it is a better rate adaptation algorithm for logarithmic utilities compared to the well-studied proportional controllers. We establish the asymptotic local stability of our controller with upper bounds on the increase / decrease gain parameters.

Sitharaman, Sai Ganesh

2005-05-01T23:59:59.000Z

117

Efficient localization in a dispersive waveguide : applications in terrestrial continental shelves and on Europa  

E-Print Network (OSTI)

Methods are developed for passive source localization and environmental parameter estimation in seismo-acoustic waveguides by exploiting the dispersive behavior of guided wave propagation. The methods developed are applied ...

Lee, Sunwoong

2006-01-01T23:59:59.000Z

118

New waveguide-type HOM damper for ALS storage ring cavities.  

E-Print Network (OSTI)

WAVEGUIDE-TYPE HOM DAMPER FOR ALS STORAGE RING CAVITIES*.CA, 94720, USA Abstract The ALS storage ring 500 MHz RFoperations issue at the ALS. During three consecutive

Kwiatkowski, Slawomir; Baptiste, Kenneth; Julian, James

2004-01-01T23:59:59.000Z

119

Emergence of multipartite optomechanical entanglement in microdisk cavities coupled to nanostring waveguide  

Science Conference Proceedings (OSTI)

In this paper, we propose a scheme to show signatures of multipartite optomechanical entanglement, which is based on two high quality factor (high- $$Q$$ ) silicon ... Keywords: Microdisk cavities, Nanostring waveguide, Optomechanical entanglement

Zhi-Cheng Shi, Yan Xia, Jie Song

2013-10-01T23:59:59.000Z

120

Electron current extraction from a permanent magnet waveguide plasma cathode  

SciTech Connect

An electron cyclotron resonance plasma produced in a cylindrical waveguide with external permanent magnets was investigated as a possible plasma cathode electron source. The configuration is desirable in that it eliminates the need for a physical antenna inserted into the plasma, the erosion of which limits operating lifetime. Plasma bulk density was found to be overdense in the source. Extraction currents over 4 A were achieved with the device. Measurements of extracted electron currents were similar to calculated currents, which were estimated using Langmuir probe measurements at the plasma cathode orifice and along the length of the external plume. The influence of facility effects and trace ionization in the anode-cathode gap are also discussed.

Weatherford, B. R.; Foster, J. E. [University of Michigan, Ann Arbor, Michigan 48109 (United States); Kamhawi, H. [NASA Glenn Research Center, Cleveland, Ohio 44135 (United States)

2011-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Bio-functional subwavelength optical waveguides for biodetection  

SciTech Connect

We report a versatile biofunctional subwavelength photonic device platform for real-time detection of biological molecules. Our devices contain lipid bilayer membranes fused onto metal oxide nanowire waveguides stretched across polymeric flow channels. The lipid bilayers incorporating target receptors are submersed in the propagating evanescent field of the optical cavity. We show that the lipid bilayers in our devices are continuous, have very high mobile fraction, and are resistant to fouling. We also demonstrate that our platform allows rapid membrane exchange. Finally we use this device for detection of specific DNA sequences in solution by anchoring complementary DNA target strands in the lipid bilayer. This evanescent wave sensing architecture holds great potential for portable, all-optical detection systems.

Sirbuly, D J; Fischer, N; Huang, S; Artyukhin, A

2007-07-10T23:59:59.000Z

122

Stereoscopic optical viewing system  

DOE Patents (OSTI)

An improved optical system which provides the operator with a stereoscopic viewing field and depth of vision, particularly suitable for use in various machines such as electron or laser beam welding and drilling machines. The system features two separate but independently controlled optical viewing assemblies from the eyepiece to a spot directly above the working surface. Each optical assembly comprises a combination of eye pieces, turning prisms, telephoto lenses for providing magnification, achromatic imaging relay lenses and final stage pentagonal turning prisms. Adjustment for variations in distance from the turning prisms to the workpiece, necessitated by varying part sizes and configurations and by the operator's visual accuity, is provided separately for each optical assembly by means of separate manual controls at the operator console or within easy reach of the operator.

Tallman, C.S.

1986-05-02T23:59:59.000Z

123

Photon correlations in two-dimensional waveguide arrays and their classical estimate  

SciTech Connect

Interference effects of photon pairs propagating through two-dimensional lattices of evanescently coupled waveguides are theoretically analyzed for input states of independent and path-entangled photons. Their correlation unveils characteristic Hong-Ou-Mandel interferences as well as more complex phenomena unique to these structures. Furthermore, purely classical states of light are used to simulate these quantum interferences in intensity correlation experiments. The results suggest that waveguide arrays can be employed as convenient devices for manipulating quantum states of light.

Keil, Robert; Dreisow, Felix; Heinrich, Matthias [Institute of Applied Physics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, D-07743 Jena (Germany); Szameit, Alexander [Department of Physics and Solid State Institute, Technion, Haifa Il-32000 (Israel); Nolte, Stefan; Tuennermann, Andreas [Institute of Applied Physics, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, D-07743 Jena (Germany); Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Strasse 7, D-07745 Jena (Germany)

2010-02-15T23:59:59.000Z

124

Disk-loaded RF waveguide matching techniques applied to silicon woodpile accelerator  

SciTech Connect

Silicon woodpile photonic crystal provides a three-dimensional dielectric waveguide system for high-gradient laser driven acceleration. The woodpile waveguide is periodically loaded in the longitudinal direction; therefore simple cross-sectional mode profile matching is not sufficient to launch the accelerating mode appropriately and will result in significant scattering loss. Hinted by the common nature of longitudinal periodicity between disk-loaded waveguide and woodpile waveguide, several coupler design schemes developed for multi-cell RF cavity are implemented in the woodpile accelerator design. Among them there are the travelling-wave match method based on S-matrix, the periodic VSWR method, and the TE-to-TM coupling iris design. This paper presents design procedures and simulation results using these methods. According to simulations, nearly 100% power transmission between SOI and woodpile waveguides with a travelling-wave match is achieved with a specially designed mode-launching coupler. Constructed by silicon rods extruding into the defect waveguide, the coupling iris provides necessary transition from TE mode to TM accelerating mode, also with negligible coupling loss.

Wu Ziran; England, Joel; Ng, Cho; Tantawi, Sami [Stanford Linear Accelerator National Laboratory 2575 Sand Hill Road, Menlo Park, CA 95051 (United States)

2012-12-21T23:59:59.000Z

125

Dynamic View Management System for Query Prediction to View Materialization  

Science Conference Proceedings (OSTI)

On-Line Analytical Processing OLAP systems based on data warehouses are the main systems for managerial decision making and must have a quick response time. Several algorithms have been presented to select the proper set of data and elicit suitable structured ... Keywords: Data Warehousing, Dynamic View Materialization, OLAP, Probabilistic Reasoning Approaches, View Prediction, View Selection

Negin Daneshpour; Ahmad Abdollahzadeh Barfourosh

2011-04-01T23:59:59.000Z

126

Nonlinear vibrational microscopy  

SciTech Connect

The present invention is a method and apparatus for microscopic vibrational imaging using coherent Anti-Stokes Raman Scattering or Sum Frequency Generation. Microscopic imaging with a vibrational spectroscopic contrast is achieved by generating signals in a nonlinear optical process and spatially resolved detection of the signals. The spatial resolution is attained by minimizing the spot size of the optical interrogation beams on the sample. Minimizing the spot size relies upon a. directing at least two substantially co-axial laser beams (interrogation beams) through a microscope objective providing a focal spot on the sample; b. collecting a signal beam together with a residual beam from the at least two co-axial laser beams after passing through the sample; c. removing the residual beam; and d. detecting the signal beam thereby creating said pixel. The method has significantly higher spatial resolution then IR microscopy and higher sensitivity than spontaneous Raman microscopy with much lower average excitation powers. CARS and SFG microscopy does not rely on the presence of fluorophores, but retains the resolution and three-dimensional sectioning capability of confocal and two-photon fluorescence microscopy. Complementary to these techniques, CARS and SFG microscopy provides a contrast mechanism based on vibrational spectroscopy. This vibrational contrast mechanism, combined with an unprecedented high sensitivity at a tolerable laser power level, provides a new approach for microscopic investigations of chemical and biological samples.

Holtom, Gary R. (Richland, WA); Xie, Xiaoliang Sunney (Richland, WA); Zumbusch, Andreas (Munchen, DE)

2000-01-01T23:59:59.000Z

127

The View from HQ  

National Nuclear Security Administration (NNSA)

A publication of the Office of Advanced Simulation & Computing, NNSA Defense Programs A publication of the Office of Advanced Simulation & Computing, NNSA Defense Programs NA-ASC-500-07-Issue 3 May 2007 The View from HQ by Dimitri Kusnezov I have been spending much of my time these days thinking about science, technology and engineering and the role of the laboratories and how that will be reflected in the Complex of the future. This is on my mind for two reasons: one is my responsibility to

128

Informative Views and Active Recognition  

E-Print Network (OSTI)

Informative Views and Active Recognition Tal Arbel, Frank P. Ferrie, and Peter Whaite TR-CIM-94-7897 Email: cim@cim.mcgill.ca #12;Informative Views and Active Recognition Tal Arbel, Frank P. Ferrie

Dudek, Gregory

129

Absorption Spectroscopy in Hollow-Glass Waveguides Using Infrared Diode Lasers[4817-25  

Science Conference Proceedings (OSTI)

Near- and mid-infrared diode lasers combined with flexible, hollow waveguides hold the promise of light weight, field portable, fast response gas sensors. The advantages of using the waveguides compared to White or Herriott multireflection cells include a small gas volume, a high photon fill factor in the waveguide, which increases molecule-light interactions, and reduction or elimination of optical fringing, which usually sets the practical limit of detectivity in absorption spectroscopy. Though hollow waveguides have been commercially available for several years, relatively few results have been reported in the literature. We present here results from our laboratory where we have injected infrared laser light into straight and coiled lengths of hollow waveguides and performed direct and wavelength modulated absorption spectroscopy on nitrous oxide, ethylene, and nitric oxide. Using a 1 mm bore, 3 meter long coiled waveguide coated for the near infrared, nitrous oxide transitions near 6595 cm-1 were observed under flowing conditions. Signal-to-noise ratios on the order of 1500:1 with RMS noise equal to 2 X 10-5 were measured. In the mid-infrared light from either a 10.1 or 5.3 micron lead salt diode laser was injected into a three meter length of 1 mm bore hollow waveguide coated for the mid-infrared. The waveguide was coiled with one loop at a diameter of 52 cm. Ethylene transitions were observed in the vicinity of 985 cm-1 with a static fill of 0.2 Torr of pure ethylene in the waveguide and nitric oxide transitions were observed in the vicinity of 1906 cm-1 using either a flow or a static fill of 1 ppm NO in nitrogen. In direct absorption the NO transitions are observed to have a signal-to-noise of approximately 5:1 for transitions with absorbances on the order of 10-3. Using wavelength modulated techniques the signal-to-noise ratio improves at least an order of magnitude. These encouraging results indicate that waveguides can be used for in situ gas monitoring.

Blake, Thomas A. (BATTELLE (PACIFIC NW LAB)); Kelly, James F. (BATTELLE (PACIFIC NW LAB)); Stewart, Timothy L. (BATTELLE (PACIFIC NW LAB)); Hartman, John S. (BATTELLE (PACIFIC NW LAB)); Sharpe, Steven W. (BATTELLE (PACIFIC NW LAB)); Sams, Robert L. (BATTELLE (PACIFIC NW LAB)); Alan Fried

2002-11-01T23:59:59.000Z

130

Reconstruction of nonlinear wave propagation  

DOE Patents (OSTI)

Disclosed are systems and methods for characterizing a nonlinear propagation environment by numerically propagating a measured output waveform resulting from a known input waveform. The numerical propagation reconstructs the input waveform, and in the process, the nonlinear environment is characterized. In certain embodiments, knowledge of the characterized nonlinear environment facilitates determination of an unknown input based on a measured output. Similarly, knowledge of the characterized nonlinear environment also facilitates formation of a desired output based on a configurable input. In both situations, the input thus characterized and the output thus obtained include features that would normally be lost in linear propagations. Such features can include evanescent waves and peripheral waves, such that an image thus obtained are inherently wide-angle, farfield form of microscopy.

Fleischer, Jason W; Barsi, Christopher; Wan, Wenjie

2013-04-23T23:59:59.000Z

131

Statistical Modeling in Nonlinear Systems  

Science Conference Proceedings (OSTI)

The use of linear statistical methods in building climate prediction models is examined, particularly the use of anomalies. The author’s perspective is that the climate system is a nonlinear interacting system, so the impact of modeling using ...

Edward P. Campbell

2005-08-01T23:59:59.000Z

132

Protective laser beam viewing device  

SciTech Connect

A protective laser beam viewing system or device including a camera selectively sensitive to laser light wavelengths and a viewing screen receiving images from the laser sensitive camera. According to a preferred embodiment of the invention, the camera is worn on the head of the user or incorporated into a goggle-type viewing display so that it is always aimed at the area of viewing interest to the user and the viewing screen is incorporated into a video display worn as goggles over the eyes of the user.

Neil, George R.; Jordan, Kevin Carl

2012-12-18T23:59:59.000Z

133

The View from HQ  

National Nuclear Security Administration (NNSA)

  NA-ASC-500-07 Issue 2 January 2007 The View from HQ Sitting in airports and planes is risky beyond the obvious dangers now in the news. Uninter- rupted time to think may lead to new ideas. Instinct instructs us that when we hear Wash- ington has some new ideas, the result must be bad. After all, ideas suggest change, which is inherently disruptive. Today the notion of predictivity is on my mind as I am leaving the V&V 2007 meeting in Los Alamos. Predictivity is on my short list of overused, ill-defined words. Washington main- tains a full lexicon of such words-a fair number of which find their way into common usage.

134

False color viewing device  

DOE Patents (OSTI)

This invention consists of a viewing device for observing objects in near-infrared false-color comprising a pair of goggles with one or more filters in the apertures, and pads that engage the face for blocking stray light from the sides so that all light reaching, the user`s eyes come through the filters. The filters attenuate most visible light and pass near-infrared (having wavelengths longer than approximately 700 nm) and a small amount of blue-green and blue-violet (having wavelengths in the 500 to 520 nm and shorter than 435 nm, respectively). The goggles are useful for looking at vegetation to identify different species and for determining the health of the vegetation, and to detect some forms of camouflage.

Kronberg, J.W.

1991-05-08T23:59:59.000Z

135

False color viewing device  

DOE Patents (OSTI)

A viewing device for observing objects in near-infrared false-color comprising a pair of goggles with one or more filters in the apertures, and pads that engage the face for blocking stray light from the sides so that all light reaching the user's eyes come through the filters. The filters attenuate most visible light and pass near-infrared (having wavelengths longer than approximately 700 nm) and a small amount of blue-green and blue-violet (having wavelengths in the 500 to 520 nm and shorter than 435 nm, respectively). The goggles are useful for looking at vegetation to identify different species and for determining the health of the vegetation, and to detect some forms of camouflage.

Kronberg, James W. (108 Independent Blvd., Aiken, SC 29801)

1992-01-01T23:59:59.000Z

136

False color viewing device  

DOE Patents (OSTI)

A viewing device for observing objects in near-infrared false-color comprising a pair of goggles with one or more filters in the apertures, and pads that engage the face for blocking stray light from the sides so that all light reaching the user's eyes come through the filters. The filters attenuate most visible light and pass near-infrared (having wavelengths longer than approximately 700 nm) and a small amount of blue-green and blue-violet (having wavelengths in the 500 to 520 nm and shorter than 435 nm, respectively). The goggles are useful for looking at vegetation to identify different species and for determining the health of the vegetation, and to detect some forms of camouflage. 7 figs.

Kronberg, J.W.

1992-10-20T23:59:59.000Z

137

Field theoretic renormalization group for a nonlinear diffusion equation  

E-Print Network (OSTI)

The paper is an attempt to relate two vast areas of the applicability of the renormalization group (RG): field theoretic models and partial differential equations. It is shown that the Green function of a nonlinear diffusion equation can be viewed as a correlation function in a field-theoretic model with an ultralocal term, concentrated at a spacetime point. This field theory is shown to be multiplicatively renormalizable, so that the RG equations can be derived in a standard fashion, and the RG functions (the $\\beta$ function and anomalous dimensions) can be calculated within a controlled approximation. A direct calculation carried out in the two-loop approximation for the nonlinearity of the form $\\phi^{\\alpha}$, where $\\alpha>1$ is not necessarily integer, confirms the validity and self-consistency of the approach. The explicit self-similar solution is obtained for the infrared asymptotic region, with exactly known exponents; its range of validity and relationship to previous treatments are briefly discussed.

N. V. Antonov; Juha Honkonen

2002-07-02T23:59:59.000Z

138

Stability of spinor Fermi gases in tight waveguides  

Science Conference Proceedings (OSTI)

The two- and three-body correlation functions of the ground state of an optically trapped ultracold spin-(1/2) Fermi gas (SFG) in a tight waveguide [one-dimensional (1D) regime] are calculated in the plane of even- and odd-wave coupling constants, assuming a 1D attractive zero-range odd-wave interaction induced by a 3D p-wave Feshbach resonance, as well as the usual repulsive zero-range even-wave interaction stemming from 3D s-wave scattering. The calculations are based on the exact mapping from the SFG to a 'Lieb-Liniger-Heisenberg' model with delta-function repulsions depending on isotropic Heisenberg spin-spin interactions, and indicate that the SFG should be stable against three-body recombination in a large region of the coupling constant plane encompassing parts of both the ferromagnetic and antiferromagnetic phases. However, the limiting case of the fermionic Tonks-Girardeau gas, a spin-aligned 1D Fermi gas with infinitely attractive p-wave interactions, is unstable in this sense. Effects due to the dipolar interaction and a Zeeman term due to a resonance-generating magnetic field do not lead to shrinkage of the region of stability of the SFG.

Campo, A. del; Muga, J. G. [Departamento de Quimica-Fisica, Universidad del Pais Vasco, Apartado 644, 48080 Bilbao (Spain); Girardeau, M. D. [College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)

2007-07-15T23:59:59.000Z

139

Acceleration and dynamics of an electron in the degenerate and magnetized plasma elliptical waveguide  

SciTech Connect

The dynamics and energy gain of an electron in the field of a transverse magnetic wave propagating inside an elliptical degenerate plasma waveguide is analytically investigated by finding the field components of the TM{sub mr} mode in this waveguide. Besides, by solving the relativistic momentum and energy equations the deflection angle and the acceleration gradient of the electron in the waveguide are obtained. Furthermore, the field components of the hybrid mode and the transferred power in the presence of the magnetic field in this waveguide are found. Also by applying the boundary conditions at the plasma-conductor interface, we calculate the dispersion relation. It is shown that the cutoff frequency of this mode is dependent on the plasma density but independent of the magnetic field. Then, a single-electron model for numerical calculations of the electron deflection angle and acceleration gradient inside the magnetized plasma-filled elliptical waveguide is generally presented to be used as a cascading process for the acceleration purposes.

Abdoli-Arani, A.; Jazi, B. [Department of Photonics, Faculty of Physics, University of Kashan, Kashan (Iran, Islamic Republic of); Shokri, B. [Physics Department and Laser-Plasma Research Institute, G. C. Shahid Beheshti University, Tehran (Iran, Islamic Republic of)

2013-02-15T23:59:59.000Z

140

Computational strategy for modeling radio wave propagation in lossy circular waveguides  

SciTech Connect

The propagation of radio waves in lossy waveguides and tunnels has been researched extensively for many years as can be seen in the detailed book by Wait. The mathematics used to model waveguides for communications is essentially the same as that needed to model radio frequency (RF) propagation in simple tunnels. The presence or lack of conductors inside a waveguide or tunnel is a key driver in the nature of the solutions one will find for a particular application, Delogne. When there are conductors passing through a waveguide or tunnel, the simplest modes of propagation are surface-guided waves following the conductor and typically enabling long-range transmission. A tunnel containing a core conductor can act rather like a coaxial cable, propagating waves at a nearly constant speed, regardless of frequency. Conversely, a tunnel or waveguide without internal conductors is subject to very different wave patterns, resulting in a much more complex propagation analysis. Holloway et al. presented an exhaustive study of RF propagation in circular structures embedded in lossy surroundings. The work of Holloway et al. is the basis for this paper, where we discuss application of their computational techniques and present refinements gleaned from our work on similar problems.

Moses, Ronald [Los Alamos National Laboratory; Cai, D Michael [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Studies of Nonlinear Problems, I  

NLE Websites -- All DOE Office Websites (Extended Search)

. . . ~0s ALAMOS SCIENTIFIC LABORATORY of the UNIVERSITY OF CALIFORNIA ' . c' . .: . Report written: May 1955 Report distributed: LA-1940 h .1 STUDIES OF NONLINEAR PROBLEMS. I . - 4 . . . ._~ Work done by: E. Fermi J. Pasta S. Ulam M. Tsingou PHYSICS Report written by: E. Fermi J. Pasta S. Ulam DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available document. original . - . * * , . ' ABSTRACT " .*. . A one-dimensional dynamical system of 64 particles with forces be- . . . tween neighbors containing nonlinear terms has been studied on the Los Alamos computer MANIAC I. The nonlinear terms considered are quadratic, cubic, and broken linear types. The results are analyzed into Fourier

142

Waveguide photon-number-resolving detectors for quantum photonic integrated circuits  

E-Print Network (OSTI)

Quantum photonic integration circuits are a promising approach to scalable quantum processing with photons. Waveguide single-photon-detectors (WSPDs) based on superconducting nanowires have been recently shown to be compatible with single-photon sources for a monolithic integration. While standard WSPDs offer single-photon sensitivity, more complex superconducting nanowire structures can be configured to have photon-number-resolving capability. In this work, we present waveguide photon-number-resolving detectors (WPNRDs) on GaAs/Al0.75Ga0.25As ridge waveguides based on a series connection of nanowires. The detection of 0-4 photons has been demonstrated with a four-wire WPNRD, having a single electrical read-out. A device quantum efficiency ~24 % is reported at 1310 nm for the TE polarization.

Sahin, D; Zhou, Z; Jahanmirinejad, S; Mattioli, F; Leoni, R; Beetz, J; Lermer, M; Kamp, M; Höfling, S; Fiore, A

2013-01-01T23:59:59.000Z

143

Cerenkov and cyclotron Cerenkov instabilities in a dielectric loaded parallel plate waveguide sheet electron beam system  

SciTech Connect

A dielectric loaded parallel plate waveguide sheet electron beam system can be taken as a reliable model for the practical dielectric loaded rectangular waveguide sheet beam system that has a transverse cross section with a large width to height ratio. By using kinetic theory, the dispersion equations for Cerenkov and cyclotron Cerenkov instabilities in the parallel plate waveguide sheet beam system have been obtained rigorously. The dependences of the growth rate of both instabilities on the electric and structural parameters have also been investigated in detail through numerical calculations. It is worthwhile to point out that adopting an electron beam with transverse velocity can evidently improve the growth rate of Cerenkov instability, which seems like the case of cyclotron Cerenkov instability.

Zhao Ding; Ding Yaogen [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)

2011-09-15T23:59:59.000Z

144

Demonstration of long-lived high power optical waveguides in air  

E-Print Network (OSTI)

We demonstrate that femtosecond filaments can set up an extended and robust thermal waveguide structure in air with a lifetime of several milliseconds, making possible the very long range guiding and distant projection of high energy laser pulses and high average power beams. As a proof of principle, we demonstrate guiding of 110 mJ, 7 ns, 532 nm pulses with 90% throughput over ~15 Rayleigh lengths in a 70 cm long air waveguide generated by the long timescale thermal relaxation of an array of femtosecond filaments. The guided pulse was limited only by our available laser energy. In general, these waveguides should be robust against the effects of thermal blooming of extremely high average power laser beams.

Jhajj, N; Birnbaum, R; Wahlstrand, J K; Milchberg, H M

2013-01-01T23:59:59.000Z

145

Driving Rydberg-Rydberg transitions from a co-planar microwave waveguide  

E-Print Network (OSTI)

The coherent interaction between ensembles of helium Rydberg atoms and microwave fields in the vicinity of a solid-state co-planar waveguide is reported. Rydberg-Rydberg transitions, at frequencies between 25 GHz and 38 GHz, have been studied for states with principal quantum numbers in the range 30 - 35 by selective electric-field ionization. An experimental apparatus cooled to 100 K was used to reduce effects of blackbody radiation. Inhomogeneous, stray electric fields emanating from the surface of the waveguide have been characterized in frequency- and time-resolved measurements and coherence times of the Rydberg atoms on the order of 250 ns have been determined.

Hogan, S D; Merkt, F; Thiele, T; Filipp, S; Wallraff, A

2011-01-01T23:59:59.000Z

146

Slow light enhanced correlated photon pair generation in photonic-crystal coupled-resonator optical waveguides  

E-Print Network (OSTI)

We demonstrate the generation of quantum-correlated photon pairs from a Si photonic-crystal coupled-resonator optical waveguide. A slow-light supermode realized by the collective resonance of high-Q and small-mode-volume photonic-crystal cavities successfully enhanced the efficiency of the spontaneous four-wave mixing process. The generation rate of photon pairs was improved by two orders of magnitude compared with that of a photonic-crystal line defect waveguide without a slow-light effect.

Matsuda, Nobuyuki; Shimizu, Kaoru; Tokura, Yasuhiro; Kuramochi, Eiichi; Notomi, Masaya; 10.1364/OE.21.008596

2013-01-01T23:59:59.000Z

147

Mathematics 658 Nonlinear Dynamics and Mechanics  

E-Print Network (OSTI)

Mathematics 658 Nonlinear Dynamics and Mechanics Instructor: Anthony M. Bloch. Office: 4842 East differential equations and dynamical systems, with applications to various mechanical and physical systems, nonlinear stability theory, Lagrangian and Hamiltonian mechanics, integrable systems, reduction

Bloch, Anthony

148

A Nonlinear Dynamical Perspective on Climate Prediction  

Science Conference Proceedings (OSTI)

A nonlinear dynamical perspective on climate prediction is outlined, based on a treatment of climate as the attractor of a nonlinear dynamical system D with distinct quasi-stationary regimes. The main application is toward anthropogenic climate ...

T. N. Palmer

1999-02-01T23:59:59.000Z

149

Interpreting Stationary Wave Nonlinearity in Barotropic Dynamics  

Science Conference Proceedings (OSTI)

Stationary wave nonlinearity describes the self-interaction of stationary waves and is important in maintaining the zonally asymmetric atmospheric general circulation. However, the dynamics of stationary wave nonlinearity, which is often ...

Lei Wang; Paul J. Kushner

2010-07-01T23:59:59.000Z

150

Nonlinear Hertzian indentation fracture mechanics  

SciTech Connect

Indentation cracking under blunt indenters is analyzed using nonlinear fracture mechanics. The usual assumptions of linear elastic fracture mechanics have been replaced with a nonlinear load vs load-point displacement curve while assuming the material is linear elastic. The load, the load-point displacement, and a function of the crack area have been related to the crack driving force, J, while assuming a cone fracture under the Hertzian sphere. Experimentally, it was found that the load-displacement curve during loading, cracking, and unloading is nonlinear. The crack length is empirically shown to be proportional to the load-point displacement for several indenters. The experimentally measured relations between indenter load, load-point displacement, and crack geometries are then analyzed with mechanical energy balances based on the similitude of crack lengths with load-point displacements. The Hertz hardness that describes the nonlinear load vs load-point displacement relation during cracking is derived on the constant J line in load-displacement space. Finally, well-known experimental expressions that relate load to crack length are shown to be indistinguishable from the load-point displacement analysis reported.

Burns, S.J.; Chia, K.Y. [Univ. of Rochester, NY (United States). Dept. of Mechanical Engineering

1995-09-01T23:59:59.000Z

151

Informative Views and Sequential Recognition  

E-Print Network (OSTI)

Informative Views and Sequential Recognition Tal Arbel and Frank P. Ferrie TR-CIM-95-10 Nov. 1995 3 Telephone: 514 398-6319 Telex: 05 268510 FAX: 514 398-7348 Email: cim@cim.mcgill.ca #12;Informative Views

Dudek, Gregory

152

Optimization Online - Solving mixed integer nonlinear programming ...  

E-Print Network (OSTI)

Nov 8, 2012 ... Solving mixed integer nonlinear programming problems for mine production planning with stockpiling. Andreas Bley(bley ***at*** ...

153

REGULARITY FOR A DOUBLY NONLINEAR PARABOLIC EQUATION  

E-Print Network (OSTI)

REGULARITY FOR A DOUBLY NONLINEAR PARABOLIC EQUATION JUHA KINNUNEN Abstract. This survey focuses on regularity results for certain degenerate doubly nonlinear parabolic equations in the case when the Lebesgue This note focuses on the regularity of nonnegative weak solutions to the doubly nonlinear parabolic equation

Kinnunen, Juha

154

On linear models for nonlinear systems  

Science Conference Proceedings (OSTI)

Best linear time-invariant (LTI) approximations are analysed for several interesting classes of discrete nonlinear time-invariant systems. These include nonlinear finite impulse response systems and a class of nonsmooth systems called bi-gain systems. ... Keywords: Approximation, Discrete-time systems, Fréchet derivative, Linear models, Nonlinear systems, System identification, Wiener systems

P. M. MäKilä; J. R. Partington

2003-01-01T23:59:59.000Z

155

Photoinduced Charge-Transfer Materials For Nonlinear Optical...  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Technology & Communications Photoinduced Charge-Transfer Materials For Nonlinear Optical Applications Photoinduced Charge-Transfer Materials For Nonlinear Optical...

156

Waveguide Electroabsorption Modulator on Si Employing Ge/SiGe Quantum Wells  

E-Print Network (OSTI)

Waveguide Electroabsorption Modulator on Si Employing Ge/SiGe Quantum Wells Onur Fidaner, Ali K. 2007 Optical Society of America OCIS codes: (230.4110) Modulators ; (230.5590) Quantum-well devices Low wells opened up the possibility of realizing small and power-efficient electroabsorption modulators

Miller, David A. B.

157

V-band Transmission and Reflection Grid Amplifier Packaged in Waveguide  

E-Print Network (OSTI)

for thermal management by allowing the heat sink to be mounted on one side of the grid array. It also reduces and cooling fan were used to remove heat from the chip. The temperature distribution across the grid aperture1 V-band Transmission and Reflection Grid Amplifier Packaged in Waveguide Chun-Tung Cheung1 , Roger

Rutledge, David B.

158

Efficient light coupling into a photonic crystal waveguide with flatband slow mode  

E-Print Network (OSTI)

We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi constant group velocity vg = c/37. An analysis based on the small Fabry-P\\'erot resonances in the simulated transmission spectra is introduced and used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6% within this wavelength range.

Säynätjoki, A; Mulot, M; Cassagne, D; Ahopelto, J; Lipsanen, H

2008-01-01T23:59:59.000Z

159

Hollow waveguides for the transmission of quantum cascade laser (QCL) energy for spectroscopic applications  

E-Print Network (OSTI)

. Keywords: Infrared fiber optics, hollow waveguides, infrared spectroscopy, long-wave infrared (LWIR-445-0754, irfibers.rutgers.edu Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI some of the tests described in this paper. REFERENCES [1] Harrington, J., Infrared Fiber Optics

160

Nanowires and nanoribbons as subwavelength optical waveguides and their use as components in photonic circuits and devices  

DOE Patents (OSTI)

Nanoribbons and nanowires having diameters less than the wavelength of light are used in the formation and operation of optical circuits and devices. Such nanostructures function as subwavelength optical waveguides which form a fundamental building block for optical integration. The extraordinary length, flexibility and strength of these structures enable their manipulation on surfaces, including the precise positioning and optical linking of nanoribbon/wire waveguides and other nanoribbon/wire elements to form optical networks and devices. In addition, such structures provide for waveguiding in liquids, enabling them to further be used in other applications such as optical probes and sensors.

Yang, Peidong; Law, Matt; Sirbuly, Donald J.; Johnson, Justin C.; Saykally, Richard; Fan, Rong; Tao, Andrea

2012-10-02T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Condition assessment of nonlinear processes  

DOE Patents (OSTI)

There is presented a reliable technique for measuring condition change in nonlinear data such as brain waves. The nonlinear data is filtered and discretized into windowed data sets. The system dynamics within each data set is represented by a sequence of connected phase-space points, and for each data set a distribution function is derived. New metrics are introduced that evaluate the distance between distribution functions. The metrics are properly renormalized to provide robust and sensitive relative measures of condition change. As an example, these measures can be used on EEG data, to provide timely discrimination between normal, preseizure, seizure, and post-seizure states in epileptic patients. Apparatus utilizing hardware or software to perform the method and provide an indicative output is also disclosed.

Hively, Lee M. (Philadelphia, TN); Gailey, Paul C. (Athens, OH); Protopopescu, Vladimir A. (Knoxville, TN)

2002-01-01T23:59:59.000Z

162

Chisolm View | Open Energy Information  

Open Energy Info (EERE)

Chisolm View Chisolm View Jump to: navigation, search Name Chisolm View Facility Chisolm View Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner GE Energy Financial Service / Enel Green Power North America Developer TradeWind Energy Energy Purchaser Alabama Power Company Location Hunter OK Coordinates 36.59527057°, -97.54501104° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":36.59527057,"lon":-97.54501104,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

163

Evolving Views of Pectin Biosynthesis  

NLE Websites -- All DOE Office Websites (Extended Search)

BIOSYNTHESIS DURING PRIMARY AND SECONDARY WALL FORMATION Multiple lines of evidence have led to a new view of primary wall architecture and the role of pectin therein. Dick-P...

164

Risk View Software Functional Specification  

Science Conference Proceedings (OSTI)

This report defines the functional requirements for a new Risk View software product to be developed as part of the Electric Power Research Institute's (EPRI's) Operations and Maintenance Excellence (OMX) initiative. plant information sources.

2010-09-30T23:59:59.000Z

165

Non-linear image processing  

SciTech Connect

Processing of nuclear medicine images is generally performed by essentially linear methods with the non-negativity condition being applied as the only non-linear process. The various methods used: matrix methods in signal space and Fourier or Hadamard transforms in frequency or sequency space are essentially equivalent. Further improvement in images can be obtained by the use of inherently non-linear methods. The recent development of an approximation to a least-difference method (as opposed to a least-square method) has led to an appreciation of the effects of data bounding and to the development of a more powerful process. Data bounding (modification of statistically improbable data values) is an inherently non-linear method with considerable promise. Strong bounding depending on two-dimensional least-squares fitting yields a reduction of mottling (buttermilk effect) not attainable with linear processes. A pre- bounding process removing very bad points is used to protect the strong bounding process from incorrectly modifying data points due to the weight of an extreme but yet unbounded point as the fitting area approaches it. (auth)

Bell, P.R.; Dillon, R.S.; Bell, M.R.

1976-01-01T23:59:59.000Z

166

Analytic model for matched-filtered scattered intensity of volume inhomogeneities in an ocean waveguide calibrated to measured seabed reverberation  

E-Print Network (OSTI)

In this thesis, we derive full theoretical expressions for the moments of the matched filtered scattered field due to volume inhomogeneities in an ocean waveguide and provide a computationally efficient time harmonic ...

Ignisca, Anamaria

2011-01-01T23:59:59.000Z

167

High-power, Ultralow-noise Semiconductor External Cavity Lasers Based on Low-confinement Optical Waveguide Gain Media  

E-Print Network (OSTI)

For the past several years, we have been developing a new class of high-power, low-noise semiconductor optical gain medium based on the slab-coupled optical waveguide (SCOW) concept. The key characteristics of the SCOW ...

Juodawlkis, Paul W.

168

Efficient light coupling from integrated single-mode waveguides to supercollimating photonic crystals on silicon-on-insulator platforms  

E-Print Network (OSTI)

We propose rib waveguides as an efficient and practical solution to the coupling of light from integrated single-mode waveguides to supercollimating planar photonic crystals. By three-dimensional simulations, we demonstrate transmission efficiencies higher than 90 % at wavelengths close to 1.55 microns in a device that can be fabricated on conventional silicon-on-insulator platforms. This approach constitutes a significant step toward the integration of supercollimating structures on photonic chips.

Vynck, K; d'Yerville, M Le Vassor; Cassagne, D

2007-01-01T23:59:59.000Z

169

A nonlinear relativistic approach to mathematical representation of vacuum electromagnetism based on extended Lie derivative  

E-Print Network (OSTI)

This paper presents an alternative {\\it relativistic nonlinear} approach to the vacuum case of classical electrodynamics. Our view is based on the understanding that the corresponding differential equations should be dynamical in nature. So, they must represent local energy-momentum balance relations. Formally, the new equations are in terms of appropriately extended Lie derivative of $\\mathbb{R}^2$-valued differential 2-form along a $\\mathbb{R}^2$-valued 2-vector on Minkowski space-time.

Stoil Donev; Maria Tashkova

2013-05-15T23:59:59.000Z

170

A nonlinear relativistic approach to mathematical representation of vacuum electromagnetism based on extended Lie derivative  

E-Print Network (OSTI)

This paper presents an alternative {\\it relativistic nonlinear} approach to the vacuum case of classical electrodynamics. Our view is based on the understanding that the corresponding differential equations should be dynamical in nature. So, they must represent local energy-momentum balance relations. Formally, the new equations are in terms of appropriately extended Lie derivative of $\\mathbb{R}^2$-valued differential 2-form along a $\\mathbb{R}^2$-valued 2-vector on Minkowski space-time.

Donev, Stoil

2013-01-01T23:59:59.000Z

171

List View | Data.gov  

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List View List View Safety Data/Tools Apps Challenges Resources Blogs Let's Talk Safety You are here Data.gov » Communities » Safety List View Interactive applications that visually display large datasets provide a portal to explore data and make discoveries. Federal agencies collect information on energy production, use, natural resources, and energy infrastructure logistics and this data can be used to create calculators, interactive maps, and other applications that leverage this data. These applications provide user communities the ability to highlight the energy issues that are occurring within their communities, aid businesses plan and analyze their proposed projects, and provide a baseline for analyzing how energy resources can be most optimally and efficiently used. This page

172

Nonlinear Fano resonance and bistable wave transmission  

E-Print Network (OSTI)

We consider a discrete model that describes a linear chain of particles coupled to a single-site defect with instantaneous Kerr nonlinearity. We show that this model can be regarded as a nonlinear generalization of the familiar Fano-Anderson model, and it can generate the amplitude depended bistable resonant transmission or reflection. We identify these effects as the nonlinear Fano resonance, and study its properties for continuous waves and pulses.

Andrey E. Miroshnichenko; Sergei F. Mingaleev; Sergej Flach; Yuri S. Kivshar

2004-12-14T23:59:59.000Z

173

Shannon capacity of nonlinear regenerative channels  

E-Print Network (OSTI)

We compute Shannon capacity of nonlinear channels with regenerative elements. Conditions are found under which capacity of such nonlinear channels is higher than the Shannon capacity of the classical linear additive white Gaussian noise channel. We develop a general scheme for designing the proposed channels and apply it to the particular nonlinear sine-mapping. The upper bound for regeneration efficiency is found and the asymptotic behavior of the capacity in the saturation regime is derived.

Sorokina, M A

2013-01-01T23:59:59.000Z

174

Nonlinear structural crack growth monitoring  

DOE Patents (OSTI)

A method and apparatus are provided for the detection, through nonlinear manipulation of data, of an indicator of imminent failure due to crack growth in structural elements. The method is a process of determining energy consumption due to crack growth and correlating the energy consumption with physical phenomena indicative of a failure event. The apparatus includes sensors for sensing physical data factors, processors or the like for computing a relationship between the physical data factors and phenomena indicative of the failure event, and apparatus for providing notification of the characteristics and extent of such phenomena.

Welch, Donald E. (Oak Ridge, TN); Hively, Lee M. (Philadelphia, TN); Holdaway, Ray F. (Clinton, TN)

2002-01-01T23:59:59.000Z

175

Lighting for remote viewing systems  

SciTech Connect

Scenes viewed by television do not provide the same channels of information for judgment of distances as scenes viewed directly, since television eliminates or degrades several depth perception cues. However, it may be possible to improve depth perception of televised scenes by enhancing the information available through depth cues that are available from lighting. A literature survey and expert opinions were integrated to design a remote lighting arrangement which could enhance depth perception of operators performing remote handling operations. This paper describes the lighting arrangement and discusses some of its advantages and disadvantages. 10 references, 2 figures.

Draper, J.V.

1984-01-01T23:59:59.000Z

176

Lighting for remote viewing systems  

SciTech Connect

Scenes viewed by television do not provide the same channels of information for judgement of distances as scenes viewed directly, since television eliminates or degrades several depth perception cues. However, it may be possible to improve depth perception of televised scenes by enhancing the information available through depth cues that are available from lighting. A literature survey and expert opinions were integrated to design a remote lighting arrangement which could enhance depth perception of operators performing remote handling operations. This paper describes the lighting arrangement and discusses some of its advantages and disadvantages. 10 references, 2 figures.

Draper, J.V.

1984-01-01T23:59:59.000Z

177

Continued fraction as a discrete nonlinear transform  

SciTech Connect

The connection between a Taylor series and a continued fraction involves a nonlinear relation between the Taylor coefficients [l brace][ital a][sub [ital n

Bender, C.M. (Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)); Milton, K.A. (Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019 (United States))

1994-01-01T23:59:59.000Z

178

Nonlinear Pricing in Energy and Environmental Markets  

E-Print Network (OSTI)

2009. “To What Electricity Price Do Consumers Respond?faced with nonlinear electricity price schedules. Nonlinearrates and multi-tier electricity prices, complicate economic

Ito, Koichiro

2011-01-01T23:59:59.000Z

179

GLOBAL OPTIMIZATION OF NONLINEAR NETWORK DESIGN 1 ...  

E-Print Network (OSTI)

of nonlinear network design refers to the minimum cost design of resistances on a .... common fluid networks of water, crude oil, natural gas satisfy the above ...

180

On Test Sets for Nonlinear Integer Maximization  

E-Print Network (OSTI)

On Test Sets for Nonlinear. Integer Maximization. July 2007; revised February 2008. Jon Leea, Shmuel Onnb, Robert Weismantelc a IBM T.J. Watson Research  ...

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181

A Unified View on Relaxations for a Nonlinear Network Flow Problem  

E-Print Network (OSTI)

Jul 7, 2013 ... Given is such network with active and passive components, that is, valves, compressors, pressure regulators (active) and pipelines (passive), ...

182

A high voltage pulsed power supply for capillary discharge waveguide applications  

Science Conference Proceedings (OSTI)

We present an all solid-state, high voltage pulsed power supply for inducing stable plasma formation (density {approx}10{sup 18} cm{sup -3}) in gas-filled capillary discharge waveguides. The pulser (pulse duration of 1 {mu}s) is based on transistor switching and wound transmission line transformer technology. For a capillary of length 40 mm and diameter 265 {mu}m and gas backing pressure of 100 mbar, a fast voltage pulse risetime of 95 ns initiates breakdown at 13 kV along the capillary. A peak current of {approx}280 A indicates near complete ionization, and the r.m.s. temporal jitter in the current pulse is only 4 ns. Temporally stable plasma formation is crucial for deploying capillary waveguides as plasma channels in laser-plasma interaction experiments, such as the laser wakefield accelerator.

Abuazoum, S.; Wiggins, S. M.; Issac, R. C.; Welsh, G. H.; Vieux, G.; Jaroszynski, D. A. [Department of Physics, Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG (United Kingdom); Ganciu, M. [Low Temperature Plasma Department, National Institute of Lasers, Plasma and Radiation Physics, 077125, Magurele, Bucharest (Romania)

2011-06-15T23:59:59.000Z

183

Spontaneous Emission from a Two-Level Atom in a Rectangular Waveguide  

E-Print Network (OSTI)

Quantum mechanical treatment of light inside dielectric media is important to understand the behavior of an optical system. In this paper, a two-level atom embedded in a rectangular waveguide surrounded by a perfect electric conductor is considered. Spontaneous emission, propagation, and detection of a photon are described by the second quantization formalism. The quantized modes for light are divided into two types: photonic propagating modes and localized modes with exponential decay along the direction of waveguide. Though spontaneous emission depends on all possible modes including the localized modes, detection far from the source only depends on the propagating modes. This discrepancy of dynamical behaviors gives two di?erent decay rates along space and time in the correlation function of the photon detection.

Moochan B. Kim; Georgios Veronis; Tae-Woo Lee; Hwang Lee; Jonathan P. Dowling

2013-09-20T23:59:59.000Z

184

Waveguiding-assisted random lasing in epitaxial ZnO thin film  

E-Print Network (OSTI)

Zinc Oxide thin films were grown on c-sapphire substrates using pulsed laser deposition. Pump power dependence of surface emission spectra, acquired using a quadrupled 266 nm laser, revealed room temperature stimulated emission (threshold of 900 kW/cm2). Time dependent spectral analysis plus gain measurements of single-shot, side-emission, spectra pumped with a nitrogen laser revealed random lasing indicative of the presence of self-forming laser cavities. It is suggested that random lasing in an epitaxial system rather than a 3-dimensional configuration of disordered scattering elements, was due to waveguiding in the film. Waveguiding causes light to be amplified within randomly-formed closed-loops acting as lasing cavities.

Dupont, P -H; Rogers, D J; Téhérani, F Hosseini; Lérondel, G

2013-01-01T23:59:59.000Z

185

Nonlinear silicon photonics from the near to mid infrared  

E-Print Network (OSTI)

waveguides,” Nature Photonics, 2 (2), 90- P. R. Bandaru, S.Vol. 7612, 76120Q, Photonics West (SPIE, San Francisco, CA,spectroscopy,” Nature Photonics, 2 (1), 48 (2008) [8] M. A.

Park, Jung Soo

2010-01-01T23:59:59.000Z

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NSAs have to guarantee that no private information from ...... tive to complementary cell suppression, manuscript, Energy Information Admin- istration

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and algorithms in this area, as well as several application areas where ...... solver reached assignment for proof timeout) found of SAT. Gap. 269. 51. 2. 20. 664.

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1.2 Notation and organization of the paper ... This paper is organized as follows. ..... i is the i-th eigenvalue of C. Then, letting ˜R := QT RQ and ˜H := QT HQ, we.

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May 22, 2003 ... although the corresponding proximity function does not have a ..... Suppose that the statement of the lemma does not hold, i.e., ...... 397–413.

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Naive exploration of this neighborhood is computationally ..... Table 2: Problem Sizes for Production Planning Test Instances. In both Table 1 and Table 2, the ...

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Note to Practitioners—In practice, production scheduling is a crucial task at ..... the search when the exploration is close to the root, and thus makes cutoff less ...

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Mar 1, 2007 ... Some of the most successful methods are: Tabu search in [Gho03], a combination of Tabu ... equality constraints are dualized as before, but they also enter the ... term it is possible to avoid fast increase of the Lagrangian dual ...

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of image reconstruction from projections in [26], significant and valuable ac- ... ods, which makes them successful in real-world applications, is computa-. 4 ...

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[23]T. S. Motzkin. The arithmetic-geometric inequality. In Inequalities ( Proceedings of Symposium Wright. Patterson Air Force Base, Ohio, 1965), pages 205–224.

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an astutely selected small working set does not significantly increase the total number of iterations required to solve the problem, and sometimes even reduces it ...

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Introduction. Consider the linear programming problem in the standard form [5, 14] minimize ... row index, say i, has to be determined such that ?j = min {¯bl/¯al,j  ...

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As is known to us, Cognition process is the instinct learning ability of human being, ..... What's more, to alleviate the undesirable effects of estimation error in the ...

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M? denotes the solar mass. which mimic the corresponding natural processes, ..... Gravitational radiation. In S. W. Hawking and W. Israel, editors,. 300 Years of ...

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Science Conference Proceedings (OSTI)

Energy Conversion – Photovoltaic, Concentrating Solar Power, and Thermoelectric ... Green Technologies for Materials Manufacturing and Processing IV.

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Science Conference Proceedings (OSTI)

Feb 15, 2011 ... cost for low power plant ... Fitness for small electricity grids, reduced .... Need a factory to make the price attractive, need an attractive price to.

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tioning, clearly identify the utility function that characterizes their attitude toward risk. The use of expected ...... with largest fixed interest rate. Alternatively, our ...

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to the performance of the exact method of [1]. They are very comparable to those of [8], although have a higher rate of increase with dimension d and/or number ...

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breakpoint at ?, and given by the two lines L1 and L2. Clearly, if ?L(v) ..... overhead which would be, for example, incurred at every node of a branch- and-

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availability-manufacturing, processing, fabrication joining, uniformity, balance of properties (what properties are important limiting), qualification, codes, safety ...

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Oct 30, 2002 ... Turing machine model, our analysis yields an O(n. 3.5 .... analysis of Vavasis and Ye's algorithm is based on the notion of crossover event,.

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May 12, 2005 ... Our algorithm is a result of the combination of stochastic ap- proximation ideas ... 2EDF R&D ... 3EDF R&D ..... Let us state the main result of this section: ..... IEEE Transactions on Systems, Science and Cybernetics, 5:307. 14.

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1France Télécom R&D, 38-40 rue du gl Leclerc, 92130 Issy-les-Moulineaux, France ... The results obtained outperform many methods based on earlier literature. ...... Linear programming under uncertainty, Management Science, 1 (

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Sep 22, 2006 ... minimizing the cost of the thermal power production if the hydro-power plant cannot supply the demand completely. Dynamic programming is a ...

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Jul 13, 2012 ... Current emphasis: visualization, data mining and applications in oil and ..... Internships. Agreement Enhancements. • Discount on indirect costs.

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Jan 27, 2011 ... Cost Horizons and Certainty Equivalents: An Approach to Stochastic Programming of Heating Oil. Management Science, 4(3):253–. 263, 1958.

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Optimization Technical Report. ISyE Department, University of Wisconsin- Madison. Oktay Günlük1 · Jeff Linderoth2. Perspective Reformulations of Mixed Integer.

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Red Herring Dec 2001. “ Nanotechnology is the understanding and control of matter at dimensions of roughly 1 to. 100 nanometers, where unique phenomena .

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We tested these formu- ... and finding radiation treatment plans in the presence of organ motion. ...... We report the number instances for which the heuristic.

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Jul 18, 2008 ... Let us define the energy product and corresponding energy norm with respect to an ...... 3.2 Shape optimization in 3D for EIT and DC resistivity.

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2003. The Solver Manuals. GAMS Development Corporation, Washington, DC, USA. Gilbert, J. 2007a. Organization of the Modulopt collection of optimization ...

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erwin@gams.com. GAMS Development Corp. Washington DC. 19th June 2001. Abstract. The `Progressive Party Problem' [9] has long been considered a prob-.

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Oct 6, 2004... and Systems Engineering, Georgia Institute of Technology, Atlanta, .... The methods described in this paper reduce the energy function (1) at ...

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digital communication networks. .... bound. IEEE Transactions on Communications, 52:632–642, 2004. ... uscript, Georgia Institute of Technology, 2007.

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It models optimal placement of communications relay nodes in the pres- ence of obstacles. This problem ...... tion Technology (CENIIT). The authors would like to

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Abstract—We consider the classical problem of estimating ... (a) to provide an estimate fn of f such that the first 2n+1 .... course at a higher computational cost.

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221

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G as a road system, T as petrol stations and a driver who wants to go from u to v. Then B(u, v) is ..... [9] (gas distribution) provide instances where almost all ...

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Aug 30, 2004 ... (where s?1 denotes the vector of reciprocals of the components of s), so that necessarily x = µs?1 > 0, ... be written in the more symmetrical form.

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The colon cancer dataset contains 22 normal and 40 colon cancer tissues ..... P. Wolfe, An algorithm for quadratic programming, Naval Research Logistics.

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Oct 14, 2009 ... where A?(y) = ?i yiA(i) maps Rm to Sn, C is the cone of copositive ...... [14] Lovász, L. (1979), “On the Shannon capacity of a graph,” IEEE ...

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each component is non-zero precisely once in every cycle of n iterations. Thus, ... and these may not inherit the overall rate of the combined pair. Similarly, in.

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[8] J. Eckstein and M. Fukushima, Some reformulation and applications of the alternating ... [10] M. Fukushima, Application of the alternating direction method of

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Feb 5, 2002 ... environment (“profile”) of an amino acid in terms of its contact shells. ..... that in order to use the MaxF heuristic we need to be able to load all.

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However, numerical simulations allow us to conjecture ... property of the optimal weights a?0,...,a?n and also an illustrative example of ... Let us define the weighted sum of exponential functions for a ? RN+1 and h ...... be two azimuth angles. ... [2] A. Labeyrie, Resolved imaging of extra-solar planets with future 10-

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trajectories, dissipative dynamical systems, Lyapunov analysis, weak .... the link with some classical results concerning semi-groups of contractions generated.

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borhood and a curve is built by linking all the points. The coordinates of ..... Learning algorithms could also be used to automatically guide the search through ...

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by learning mathematical principles, and subsequent implementation of mathematical ... area under a curve as a sum of areas of rectangles as the width of each ...

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Sep 18, 2009 ... telecommunication industry [49] which can be reformulated as a two-stage ...... problem under equilibrium constraints in electricity spot market ...

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Jun 6, 2012 ... fossil fuels and chart a new course on energy in this country, we are condemning future generations to global catastrophe.” Senator Obama ...

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Oct 19, 2010 ... In aircraft routing, maintenance events replenish aircrafts' ability to fly. In .... with several different label data structure and treatment strategies.

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of an extension of the Fundamental Theorem of Linear Programming, and proved , in ..... with ?v for v = [0,..., 0, 1] ? Rn (it does not matter that Nowak drops the last row and ...... Handbook of Combinatorial Optimization (supp. Vol. A), 1–74.

236

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and Boyd (1996), Todd (2001), the SDP handbook edited by Wolkowicz et al. ..... cut polytope CHULL(G) does not admit a polynomial time separation oracle, but ...... problem. In cutting plane algorithms it is of fundamental importance that re-.

237

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s k C bakc D s k C bas a.s k/c s k C bas .s k/c D s k C as .s k/ D as; the claim follows. Lemma A.2 (Chernoff bounds, see Mitzenmacher and Upfal [17]). Let X1;:

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In order to increase the search capability of MBH, a population framework has been proposed ... The key idea is to avoid new individuals to enter the population if someone similar (in a ..... We measure the efficiency in terms of number of (two-.

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These plugins have two essential callbacks that are called .... assigned to opened facilities so that the total sum of connection distances is minimized and the ...

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Feb 28, 2012 ... assumed to be essential and the only decision criterion is the travel distance. The portion ... On the other side, customers choose the facilities to.

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Rep., Argonne National Laboratory, Argonne,. Illinois, USA, 1992. [2] A. Borzi and K. Kunisch, A globalization strategy for the multigrid solution of elliptic optimal ...

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one additional order of magnitude) by finding the best axis-parallel ellipsoid, which is however too expensive to be done (outside the root node) within our ...

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does not apply here because the objective function of LFMP may be unbounded ...... Handbook of Global Optimization, Kluwer Academic Publishers, 495-608.

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Department of Applied Mathematics, Beijing Jiaotong University, Beijing ... (SDP), plays a fundamental role in mathematical programming, see, e.g., [21, 2, 7]. ...... [ 21] H. Wolkowicz, R. Saigal, L. Vandenberghe: Handbook of Semidefinite ...

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Feb 22, 2002 ... This problem is of fundamental importance in mathematics and physical sciences ... ?Department of Mathematics and Statistics, University of Guelph, Ontario N1G 2W1, Canada. Email: ...... Handbook of Semidefinite Program-.

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Aug 6, 2010 ... (doi:10.1007/s00134-010-1979-1) contains supplementary material, which is .... The visual inspection of the distribution of the EQ-5D scores ...

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Feb 16, 1998 ... temperatures and quenched by injecting helium gas. All processes ..... retrofitted with “mushroom” shaped TiB2-G cathode elements and op- erated for ..... same time improving the formability of alloys and reducing the natural aging rate. .... of many magnesium die castings in production vehicles. In order for ...

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Jul 3, 2007 ... some cases, give conjectures in a fully automated way). Considering that ..... The input of the program is the definition of a given problem written in a text file. .... For instance, one can get statistics ... To determine S, GraPHedron does not need to access the graphs. ..... on Graph Theory (Novi Sad, 1983), pp.

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Selectively Erbium Doped Titanium Diffused Optical Waveguide Amplifiers in Lithium Niobate  

E-Print Network (OSTI)

Selectively erbium (Er) doped titanium (Ti) in-diffused optical waveguide amplifiers on lithium niobate (LiNbO3) substrate have been fabricated and characterized in the wavelength regime around ? = 1.53?m using counter-directional pumping at ?P = 1.48?m. LiNbO3 waveguide amplifiers are desirable for providing gain in optical circuit chips through integration with other optical elements on a single substrate. A prerequisite for achieving useful gain rests on the optimization of overlap between the incident guided optical signal mode distribution and the evolving emission from excited Er ions. The extent of overlap can be controlled by adjusting fabrication parameters. Fabrication parameters for Er-doped Ti in-diffused waveguide amplifiers of useful optical gain have been optimized by diffusing selective patterns of vacuum-deposited 17nm-thick erbium film at 1100?C for 100 hours into LiNbO3, and integrating with 7?m-wide single mode straight channel waveguides formed by diffusing 1070Å thick titanium film into the LiNbO3. Small-signal gain characterization was carried out with a -30 dBm of transmitted input signal power at ?S=1531nm with counter-directionally launched pump power ranging between 0 to 119mW at ?P=1488nm, using TM polarization for both the signal and pump beams. At a maximum launched pump power of 119mW, a signal enhancement of 8.8dBm for 25mm-long erbium doped region, and 11.6dBm for 35mm-long erbium doped region were obtained. The corresponding calculated net gain values are 1.8dB and 2.8dB, for the 25mm-long and 35mm-long Er-doped regions, respectively.

Suh, Jae Woo

2010-12-01T23:59:59.000Z

250

Proposal for Optical Super-Focusing with a Metal-Dielectric Waveguide Array  

E-Print Network (OSTI)

In this paper, super-focusing using radiationless electromagnetic interference is extended to the visible regime. It is shown that the highest-order mode of a specifically designed metal-dielectric waveguide array can provide the rapidly oscillating source field for radiationless interference. Using finite-difference time-domain simulations, an example structure is demonstrated. This structure provides focusing to 0.21 of the optical wavelength at a distance of half the optical wavelength from the source.

Gordon, Reuven

2008-01-01T23:59:59.000Z

251

Mode-coupling Cerenkov sum-frequency-generation in a multimode planar waveguide  

SciTech Connect

We present experimental and theoretical studies of the mode-coupling Cerenkov sum-frequency radiations in a multimode LiNbO{sub 3} planar waveguide. The radiations result from the coupling of different guided modes of the fundamental wave, which have the same optical frequencies but different propagation constants. At the same time, scattering-involved Cerenkov sum-frequency-generation was also observed and discussed. Our theoretical predictions are in well accordance with the experimental results.

Chen Changdong; Su Jie; Xu Ping; Hu Xiaopeng; Zhao Gang; Liu Yanhua; Lv Xinjie; Zhu Shining [Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China); Zhang Yong [Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China); School of Modern Engineering and Applied Science, Nanjing University, Nanjing, 210093 (China)

2010-10-18T23:59:59.000Z

252

Programmably structured plasma waveguide for development of table-top photon and particle sources  

Science Conference Proceedings (OSTI)

Programmable fabrication of longitudinal spatial structures in an optically preformed plasma waveguide in a gas jet was achieved, by using laser machining with a liquid-crystal spatial light modulator as the pattern mask. Fabrication of periodic structures with a minimal period of 200 {mu}m and density-ramp structures with a minimal slope length of 100 {mu}m was attained. The technique is useful for the optimization of various laser-plasma-based photon and particle sources.

Hung, T.-S.; Ho, Y.-C.; Wong, S.-J.; Chen, S.-Y. [Department of Physics, National Central University, Jhong-Li 320, Taiwan (China); Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan (China); Chang, Y.-L. [Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan (China); Department of Physics, National Chung Cheng University, Chia-Yi 621, Taiwan (China); Chu, H.-H. [Department of Physics, National Central University, Jhong-Li 320, Taiwan (China); Lin, J.-Y. [Department of Physics, National Chung Cheng University, Chia-Yi 621, Taiwan (China); Wang, J. [Department of Physics, National Central University, Jhong-Li 320, Taiwan (China); Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan (China); Department of Physics, National Taiwan University, Taipei 106, Taiwan (China)

2012-06-15T23:59:59.000Z

253

Distant perturbation asymptotics in window-coupled waveguides. I. The non-threshold case  

E-Print Network (OSTI)

We consider a pair of adjacent quantum waveguides, in general of different widths, coupled laterally by a pair of windows in the common boundary, not necessarily of the same length, at a fixed distance. The Hamiltonian is the respective Dirichlet Laplacian. We analyze the asymptotic behavior of the discrete spectrum as the window distance tends to infinity for the generic case, i.e. for eigenvalues of the corresponding one-window problems separated from the threshold.

D. Borisov; P. Exner

2006-06-07T23:59:59.000Z

254

Backward wave radiation from negative permittivity waveguides and its use for THz subwavelength imaging  

SciTech Connect

In this paper we demonstrate the possibility of backward radiation from a negative permittivity planar (slab) waveguide. Furthermore, we show that backward radiation can be used to achieve sub-wavelength imaging of a point source placed close to such a slab or to a periodic layered system of slabs. Finally, we demonstrate backward-radiation-based imaging in the case of realistic materials operating in the THz regime, such as polaritonic alkali-halide systems.

Basharin, Alexey A.; Kafesaki, Maria; Economou, Eleftherios N.; Soukoulis, Costas M.

2012-05-23T23:59:59.000Z

255

Census and viewing of organisms  

NLE Websites -- All DOE Office Websites (Extended Search)

Census and viewing of organisms Census and viewing of organisms Name: m hariaczyi Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: How many organisms exist in the world today? What is the most powerful microscope that could be used for viewing organism? Replies: The most powerful microscope is called an electron microscope, which can be used for viewing entire organisms, although few organisms are small enough to see all of them at high magnifications allowed by this microscope. So most often its used to look at fixed sections of organisms. Since the electron microscope only works in a vacuum, with no air, you cannot look at live organisms. To do that, probably the most powerful microscope is called a Nomarski, or in technical terms, a "differential interference contrast" microscope. This is a modification of a normal light microscope that allows better contrast in living tissue. It is not any more powerful than a light microscope, and is much less powerful than an electron microscope, but it allows you to see living things much better.

256

Bayesian networks: A teacher's view  

Science Conference Proceedings (OSTI)

Teachers viewing Bayesian network-based proficiency estimates from a classroom full of students face a different problem from a tutor looking at one student at a time. Fortunately, individual proficiency estimates can be aggregated into classroom and ... Keywords: Aggregation, Bayesian networks, Computer graphics, Probabilities

Russell G. Almond; Valerie J. Shute; Jody S. Underwood; Juan-Diego Zapata-Rivera

2009-03-01T23:59:59.000Z

257

On the computation of relational view complements  

Science Conference Proceedings (OSTI)

Views as a means to describe parts of a given data collection play an important role in many database applications. In dynamic environments where data is updated, not only information provided by views, but also information provided by data sources yet ... Keywords: Relational algebra, data warehouses, minimal complements, self-maintainability, view complements, views

Jens Lechtenbörger; Gottfried Vossen

2003-06-01T23:59:59.000Z

258

Nonlinear sensitivity analysis of reinforced concrete frames  

Science Conference Proceedings (OSTI)

Design sensitivity analysis is a necessary task for design optimization of structures. Methods of sensitivity analysis for linear systems have been developed and well documented in the literature; however there are a few such research works for nonlinear ... Keywords: Geometric effects, Material nonlinearity, Pushover, RCMRF, Sensitivity analysis

AliReza Habibi; Hamid Moharrami

2010-07-01T23:59:59.000Z

259

Nonlinear optical response from periodic molecular structures  

Science Conference Proceedings (OSTI)

The explicit expressions of all independent components of the molecular crystal nonlinear susceptibility (NS) tensor (of any order) are given through the independent components of hyperpolarizability (HP) tensors of the constituting molecules. This expression ... Keywords: Hartree-Fock time-dependent approach, Hyperpolarizability, Lorentz tensor, Madelung potential, nonlinear susceptibility, reaction field theory

M. Mestechkin

2008-04-01T23:59:59.000Z

260

Generating nonlinear FM chirp waveforms for radar.  

SciTech Connect

Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms.

Doerry, Armin Walter

2006-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Nonlinear Shear-free Radiative Collapse  

E-Print Network (OSTI)

We study realistic models of relativistic radiating stars undergoing gravitational collapse which have vanishing Weyl tensor components. Previous investigations are generalised by retaining the inherent nonlinearity at the boundary. We transform the boundary condition to an Abel equation of the first kind. A variety of nonlinear solutions are generated all of which can be written explicitly. Several classes of infinite solutions exist.

S. S. Misthry; S. D. Maharaj; P. G. L. Leach

2008-08-15T23:59:59.000Z

262

Quasichemical Models of Multicomponent Nonlinear Diffusion  

E-Print Network (OSTI)

Diffusion preserves the positivity of concentrations, therefore, multicomponent diffusion should be nonlinear if there exist non-diagonal terms. The vast variety of nonlinear multicomponent diffusion equations should be ordered and special tools are needed to provide the systematic construction of the nonlinear diffusion equations for multicomponent mixtures with significant interaction between components. We develop an approach to nonlinear multicomponent diffusion based on the idea of the reaction mechanism borrowed from chemical kinetics. Chemical kinetics gave rise to very seminal tools for the modeling of processes. This is the stoichiometric algebra supplemented by the simple kinetic law. The results of this invention are now applied in many areas of science, from particle physics to sociology. In our work we extend the area of applications onto nonlinear multicomponent diffusion. We demonstrate, how the mechanism based approach to multicomponent diffusion can be included into the general thermodynamic ...

Gorban, A N; Wahab, H A

2011-01-01T23:59:59.000Z

263

Non-linear Seismic Soil Structure Interaction Method for Developing Nonlinear Seismic SSI  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Linear Seismic Soil Structure Interaction (SSI) Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011 E102003020BDS Presentation Outline  Purpose of Presentation  Linear versus Non-Linear Seismic SSI  Non-Linear seismic Soil Structure Interaction (NLSSI) Studies  The NLSSI Introduction  Non-Linearity in Seismic SSI Analysis  Commercial Software Elements  Commercial Software Non-Linear Constitutive Models  Non-Linear Seismic SSI Damping  Demonstration of Time Domain 2D Model  NLSSI Validation Approach  NLSSI Implementation  Need For NLSSI  Conclusions E102003020BDS Purpose of Presentation  The purpose of the presentation is to establish the need for using non-linear analysis

264

NONLINEAR ASTEROSEISMOLOGY OF RR LYRAE  

SciTech Connect

The observations of the Kepler Space Telescope revealed that fundamental-mode RR Lyrae stars may show various radial overtones. The presence of multiple radial modes may allow us to conduct nonlinear asteroseismology: comparison of mode amplitudes and frequency shifts between observations and models. Here we report the detection of three radial modes in the star RR Lyr, the eponym of the class, using the Kepler short cadence data: besides the fundamental mode, both the first and the ninth overtones can be derived from the data set. RR Lyrae shows period doubling, but switches occasionally to a state where a pattern of six pulsation cycles repeats instead of two. We found hydrodynamic models that show the same three modes and the period-six state, allowing for comparison with the observations.

Molnar, L.; Kollath, Z.; Szabo, R. [Konkoly Observatory, MTA CSFK, H-1121 Budapest, Konkoly Thege Miklos ut 15-17 (Hungary); Bryson, S.; Mullally, F.; Thompson, S. E. [NASA Ames Research Center, MS 244-30, Moffet Field, CA 94035 (United States); Kolenberg, K., E-mail: molnar.laszlo@csfk.mta.hu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138 (United States)

2012-09-20T23:59:59.000Z

265

Nonlinear Fluid Dynamics from Gravity  

E-Print Network (OSTI)

Black branes in AdS5 appear in a four parameter family labeled by their velocity and temperature. Promoting these parameters to Goldstone modes or collective coordinate fields -- arbitrary functions of the coordinates on the boundary of AdS5 -- we use Einstein's equations together with regularity requirements and boundary conditions to determine their dynamics. The resultant equations turn out to be those of boundary fluid dynamics, with specific values for fluid parameters. Our analysis is perturbative in the boundary derivative expansion but is valid for arbitrary amplitudes. Our work may be regarded as a derivation of the nonlinear equations of boundary fluid dynamics from gravity. As a concrete application we find an explicit expression for the expansion of this fluid stress tensor including terms up to second order in the derivative expansion.

Sayantani Bhattacharyya; Veronika E Hubeny; Shiraz Minwalla; Mukund Rangamani

2007-12-14T23:59:59.000Z

266

Nonlinear image filtering within IDP++  

Science Conference Proceedings (OSTI)

IDP++, image and data processing in C++, is a set of a signal processing libraries written in C++. It is a multi-dimension (up to four dimensions), multi-data type (implemented through templates) signal processing extension to C++. IDP++ takes advantage of the object-oriented compiler technology to provide ``information hiding.`` Users need only know C, not C++. Signals or data sets are treated like any other variable with a defined set of operators and functions. We here some examples of the nonlinear filter library within IDP++. Specifically, the results of MIN, MAX median, {alpha}-trimmed mean, and edge-trimmed mean filters as applied to a real aperture radar (RR) and synthetic aperture radar (SAR) data set.

Lehman, S.K.; Wieting, M.G.; Brase, J.M.

1995-02-09T23:59:59.000Z

267

Views of the solar system  

SciTech Connect

Views of the Solar System has been created as an educational tour of the solar system. It contains images and information about the Sun, planets, moons, asteroids and comets found within the solar system. The image processing for many of the images was done by the author. This tour uses hypertext to allow space travel by simply clicking on a desired planet. This causes information and images about the planet to appear on screen. While on a planet page, hyperlinks travel to pages about the moons and other relevant available resources. Unusual terms are linked to and defined in the Glossary page. Statistical information of the planets and satellites can be browsed through lists sorted by name, radius and distance. History of Space Exploration contains information about rocket history, early astronauts, space missions, spacecraft and detailed chronology tables of space exploration. The Table of Contents page has links to all of the various pages within Views Of the Solar System.

Hamilton, C.

1995-02-01T23:59:59.000Z

268

Nonlinear behavior of reinforced concrete structures under seismic excitation  

E-Print Network (OSTI)

Exploring nonlinear behavior of structures through structural analysis software can be time and computer processing intensive especially with complicated structural models. This paper will explore the nonlinear behavior ...

Pires, Matthew Anthony

2013-01-01T23:59:59.000Z

269

MODELING OF STATIC MINING SUBSIDENCE IN A NONLINEAR MEDIUM  

E-Print Network (OSTI)

Static Evaluation of Mining Subsidence," Rep. No. LBL-11356,MODELING OF STATIC MINING SUBSIDENCE IN A NONLINEAR MEDIUMMODELING OF STATIC MINING SUBSIDENCE IN A NONLINEAR ~lliDIUM

Ratigan, J.L.

2013-01-01T23:59:59.000Z

270

18.385 Nonlinear Dynamics and Chaos, Fall 2002  

E-Print Network (OSTI)

Nonlinear dynamics with applications. Intuitive approach with emphasis on geometric thinking, computational and analytical methods. Extensive use of demonstration software. Topics: Bifurcations. Phase plane. Nonlinear ...

Rosales, Rodolfo

271

Chromium diffusion in lithium niobate for active optical waveguides Jo& M. Almeida,a) Gerard Boyle,b) and Ant6nio P. Leite  

E-Print Network (OSTI)

Chromium diffusion in lithium niobate for active optical waveguides Jo& M. Almeida,a) Gerard Boyle-doped lithium niobate substrates in which the active ions are introduced by thermal diffusion from a film of chromium diffused proton-exchanged and chromium/titanium-diffused lithium niobate waveguides have been

272

High-power Waveguide Dampers for the Short-Pulse X-Ray Project at the Advanced Photon Source  

Science Conference Proceedings (OSTI)

High-power waveguide dampers have been designed and prototyped for the Short-Pulse X-ray (SPX) cavities at the Advanced Photon Source. The cavities will operate at 2.815 GHz and utilize the TM110 dipole mode. As a result, higher-order (HOM) and lower-order mode (LOM) in-vacuum dampers have been designed to satisfy the demanding broadband damping requirements in the APS storage ring. The SPX single-cell cavity consists of two WR284 waveguides for damping the HOMs and one WR284 waveguide for primarily damping the LOM where up to 2kW will be dissipated in the damping material. The damper designs and high-power experimental results will be discussed in this paper.

Waldschmidt, G J; Liu, J; Middendorf, M E; Nassiri, A; Smith, T L; Wu, G; Henry, J; Mammosser, J D; Rimmer, R A

2012-07-01T23:59:59.000Z

273

Logical queries over views: Decidability and expressiveness  

Science Conference Proceedings (OSTI)

We study the problem of deciding the satisfiability of first-order logic queries over views, with our aim to delimit the boundary between the decidable and the undecidable fragments of this language. Views currently occupy a central place in database ... Keywords: Löwenheim class, Satisfiability, conjunctive query, containment, database query, database view, decidability, first-order logic, monadic logic, ontology reasoning, unary logic, unary view

James Bailey; Guozhu Dong; Anthony WIDJAJA To

2010-01-01T23:59:59.000Z

274

Seafloor Pressure Measurements of Nonlinear Internal Waves  

Science Conference Proceedings (OSTI)

Highly resolved pressure measurements on the seafloor over New Jersey’s continental shelf reveal the pressure signature of nonlinear internal waves of depression as negative pressure perturbations. The sign of the perturbation is determined by ...

J. N. Moum; J. D. Nash

2008-02-01T23:59:59.000Z

275

Nonlinearities in Low-Frequency Equatorial Waves  

Science Conference Proceedings (OSTI)

The nonlinear response to low-latitude, temporally periodic forcing centered on the equator is studied. Comparisons are made with a linear solution containing no advections; for both solutions the model consists of a spectral, equatorial ?-plane ...

Andrew H. Van Tuyl

1987-09-01T23:59:59.000Z

276

Nonlinear transform coding with lossless polar coordinates  

E-Print Network (OSTI)

In conventional transform coding, the importance of preserving desirable quantization partition cell shapes prevents one from considering the use of a nonlinear change of variables. If no linear transformation of a given ...

Ba, Demba Elimane

2006-01-01T23:59:59.000Z

277

Iterafive Nonlinear Inversion Methods for Tomographic Problems  

Science Conference Proceedings (OSTI)

The application of nonlinear iterafive algorithms to two-dimensional tomographic reconstructions is discttszed and a number of numerical examples are given, using as an illustrative basis reconstruction of the spatial distribution of liquid water ...

S. Twomey

1987-12-01T23:59:59.000Z

278

Fluctuation-induced interactions and nonlinear nanophotonics  

E-Print Network (OSTI)

We present theoretical and numerical methods for studying Casimir forces and nonlinear frequency conversion in nanophotonic media consisting of arbitrary geometries and materials. The first section of the thesis focuses ...

Rodriguez-Wong, Alejandro

2010-01-01T23:59:59.000Z

279

Nonlinear Atmospheric Adjustment to Thermal Forcing  

Science Conference Proceedings (OSTI)

A nonlinear, numerical model of a compressible atmosphere is used to simulate the hydrostatic and geostrophic adjustment to a localized prescribed heating applied over five minutes with a size characteristic of an isolated, deep, cumulus cloud. ...

Paul F. Fanelli; Peter R. Bannon

2005-12-01T23:59:59.000Z

280

Linear and Nonlinear Propagation of Supercell Storms  

Science Conference Proceedings (OSTI)

A nonlinear formula for updraft motion in supercell storms is derived from Petterssen's formula for the motion of systems and the vertical equation of motion, and tested on form-preserving disturbances. At each level, continuous propagation of an ...

Robert Davies-Jones

2002-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

MECHANICS AND NONLINEAR CONTROL: MAKING UNDERWATER VEHICLES  

E-Print Network (OSTI)

MECHANICS AND NONLINEAR CONTROL: MAKING UNDERWATER VEHICLES RIDE AND GLIDE Naomi Ehrich Leonard \\Lambda \\Lambda Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 naomi@princeton.edu Abstract: Methods from geometric mechanics and dynamical systems theory make

Leonard, Naomi

282

Effect of Nonlinearity on Atmospheric Gravity Waves  

Science Conference Proceedings (OSTI)

The weakly nonlinear limit of two-dimensional gravity waves in an incompressible, inviscid and stably stratified atmosphere is studied. The three-wave resonant interaction theory indicates an energy cascade from a vertically propagating wave (...

Mostafa M. Ibrahim

1987-02-01T23:59:59.000Z

283

Nonlinear Wave Statistics in a Focal Zone  

Science Conference Proceedings (OSTI)

In this paper, the combined effects of refraction and nonlinearity on the evolution of ocean surface wave statistics are considered and possible implications for the likelihood of extreme waves, also known as freak or rogue waves, are examined. A ...

T. T. Janssen; T. H. C. Herbers

2009-08-01T23:59:59.000Z

284

Nonlinear Advection Schemes on the Octagonal Grid  

Science Conference Proceedings (OSTI)

Successful treatment of nonlinear momentum advection is one of the outstanding challenges for the application of rectangular quasi-uniform spherical grids in global circulation models. Quasi-uniform grids (e.g., cubic and octagonal), which are ...

Miodrag Ran?i?; Hai Zhang; Verica Savic-Jovcic

2008-12-01T23:59:59.000Z

285

A Parameterization Technique for Nonlinear Spectral Models  

Science Conference Proceedings (OSTI)

The feasibility of developing an objective parameterization technique is examined for general nonlinear hydrodynamical systems. The typical structure of these hydrodynamical systems, regardless of their complexity, is one in which the rates of ...

Ronald Gelaro; Hampton N. Shirer

1986-04-01T23:59:59.000Z

286

On Nonlinear Flow with Multiple Obstructions  

Science Conference Proceedings (OSTI)

Whereas long-wave theories have proved successful in describing, the nonlinear effects of single obstructions on narrow flows, the theories can fail when several obstructions are present. This failure is demonstrated using a simple laboratory ...

Lawrence J. Pratt

1984-04-01T23:59:59.000Z

287

Time-Dependent Fully Nonlinear Geostrophic Adjustment  

Science Conference Proceedings (OSTI)

Shock-capturing numerical methods are employed to integrate the fully nonlinear, rotating 1D shallow-water equations starting from steplike nongeostrophic initial conditions (a Rossby adjustment problem). Such numerical methods allow one to ...

Allen C. Kuo; Lorenzo M. Polvani

1997-08-01T23:59:59.000Z

288

Nonlinear Normal Mode Initialization with Physics  

Science Conference Proceedings (OSTI)

The nonlinear normal mode initialization with physics was applied for analyses in FGGE IIIb data of the European Center for Medium Range Weather Forecasting (ECMWF). A convergence of the iteration in the initialization was attained by modifying ...

Takeo Kitade

1983-11-01T23:59:59.000Z

289

Symbolic Analysis of Nonlinear Analog Circuits  

Science Conference Proceedings (OSTI)

A new method is presented to model symbolically strongly nonlinear circuits, characterized by Piece-Wise Linear (PWL) functions. The method follows the idea of Bokhoven and Leenaerts, and formulates the problem as a linear complementarity problem (LCP). ...

Alicia Manthe; Zhao Li; C.-J. Richard Shi; Kartikeya Mayaram

2003-03-01T23:59:59.000Z

290

Three-Dimensional Nonlinear Acoustical Holography  

E-Print Network (OSTI)

Nearfield Acoustical Holography (NAH) is an acoustic field visualization technique that can be used to reconstruct three-dimensional (3-D) acoustic fields by projecting two-dimensional (2-D) data measured on a hologram surface. However, linear NAH algorithms developed and improved by many researchers can result in significant reconstruction errors when they are applied to reconstruct 3-D acoustic fields that are radiated from a high-level noise source and include significant nonlinear components. Here, planar, nonlinear acoustical holography procedures are developed that can be used to reconstruct 3-D, nonlinear acoustic fields radiated from a high-level noise source based on 2-D acoustic pressure data measured on a hologram surface. The first nonlinear acoustic holography procedure is derived for reconstructing steady-state acoustic pressure fields by applying perturbation and renormalization methods to nonlinear, dissipative, pressure-based Westervelt Wave Equation (WWE). The nonlinear acoustic pressure fields radiated from a high-level pulsating sphere and an infinite-size, vibrating panel are used to validate this procedure. Although the WWE-based algorithm is successfully validated by those two numerical simulations, it still has several limitations: (1) Only the fundamental frequency and its second harmonic nonlinear components can be reconstructed; (2) the application of this algorithm is limited to mono-frequency source cases; (3) the effects of bent wave rays caused by transverse particle velocities are not included; (4) only acoustic pressure fields can be reconstructed. In order to address the limitations of the steady-state, WWE-based procedure, a transient, planar, nonlinear acoustic holography algorithm is developed that can be used to reconstruct 3-D nonlinear acoustic pressure and particle velocity fields. This procedure is based on Kuznetsov Wave Equation (KWE) that is directly solved by using temporal and spatial Fourier Transforms. When compared to the WWE-based procedure, the KWE-based procedure can be applied to multi-frequency source cases where each frequency component can contain both linear and nonlinear components. The effects of nonlinear bent wave rays can be also considered by using this algorithm. The KWE-based procedure is validated by conducting an experiment with a compression driver and four numerical simulations. The numerical and experimental results show that holographically-projected acoustic fields match well with directly-calculated and directly-measured fields.

Niu, Yaying

2013-05-01T23:59:59.000Z

291

Investigation of Propagation Characteristics of Twisted Hollow Waveguides for Particle Accelerator Applications  

Science Conference Proceedings (OSTI)

A new class of accelerating structures employing a uniformly twisted waveguide is investigated. Twisted waveguides of various cross-sectional geometries are considered and analyzed. It is shown that such a twisted waveguide can support waves that travel at a speed slower than the speed of light c. The slow-wave properties of twisted structures are of interest because these slow-wave electromagnetic fields can be used in applications such as electron traveling wave tubes and linear particle accelerators. Since there is no exact closed form solution for the electromagnetic fields within a twisted waveguide or cavity, several previously proposed approximate methods are examined, and more effcient approaches are developed. It is found that the existing perturbation theory methods yield adequate results for slowly twisted structures; however, our efforts here are geared toward analyzing rapidly twisted structures using modifed finite difference methods specially suited for twisted structures. Although the method can handle general twisted structures, three particular cross sections are selected as representative cases for careful analysis. First, a slowly twisted rectangular cavity is analyzed as a reference case. This is because its shape is simple and perturbation theory already gives a good approximate solution for such slow twists rates. Secondly, a symmetrically notched circular cross section is investigated, since its longitudinal cross section is comparable to the well known disk-loaded cavity (used in many practical accelerator designs, including SLAC). Finally, a "dumbbell" shaped cross section is analyzed because of its similarity to the well-known TESLA-type accelerating cavity, which is of great importance because of its wide acceptance as a superconducting cavity. To validate the results of the developed theory and our extensive simulations, the newly developed numerical models are compared to commercial codes. Also, several prototypes are developed employing the three basic shapes discussed previously. Bench measurements are performed on the prototype cavities to evaluate dispersion by measuring the field distribution along these cavities. The measurement results are compared to the simulations and theoretical results, and good agreement is shown. Once validated, the developed models are used to design twisted accelerating structures with specific phase velocities and good accelerating performance.

Wilson, Joshua L [ORNL

2008-09-01T23:59:59.000Z

292

An ultra-thin waveguide twist constructed using fish-scale metallic wires  

E-Print Network (OSTI)

This study theoretically and experimentally investigates the transmission properties of a metamaterial slab comprised of two layers of metallic fish-scale structure arrays and a sandwiched dielectric layer. Calculations show that the asymmetric transmission can be tuned by varying the slab thickness, due to evanescent interlayer coupling. The spatial evolution of the local field inside the structure indicates that the slab functions as a perfect polarization transformer at certain frequencies in the manner of a waveguide twist. Measured transmission spectra are in good agreement with calculated results when material dissipation is considered.

Han, Jin; Fan, Yuancheng; Wei, Zeyong; Wu, Chao; Cao, Yang; Yu, Xing; Li, Fang; Wang, Zhanshan

2011-01-01T23:59:59.000Z

293

Theoretical and experimental investigation of an active three-branch Ti:LiNbO/sub 3/ optical waveguide switch  

SciTech Connect

A theoretical and experimental investigation of an active three-branch multimoded Ti:LiNbO/sub 3/ waveguide switch is presented. The theoretical study covers the efficiency of the electrooptic index change in a multimoded waveguide, the mode conversion occurring in a tapered transition and, finally, the power division among the branches of the switch. For the experimental characterization, the optical measurements of a device fabricated in a Z-cut LiNbO/sub 3/ crystal are presented and discussed. Several improvements as well as applications are pointed out.

Belanger, M.; Yip, G.L.

1989-01-01T23:59:59.000Z

294

Non-linear dynamic of rotor-stator system with non-linear bearing clearance  

E-Print Network (OSTI)

The study deals with a rotor-stator contact inducing vibration in rotating machinery. A numerical rotor-stator system, including a non-linear bearing with Hertz contact and clearance is considered. To determine the non-linear responses of this system, non-linear dynamic equations can be integrated numerically. However, this procedure is both time consuming and costly to perform. The aim of this Note is to apply the Alternate Frequency/Time Method and the 'path following continuation' in order to obtain the non-linear responses to this problem. Then the orbits of rotor and stator responses at various speeds are investigated.

Jean-Jacques Sinou; Fabrice Thouverez

2008-01-19T23:59:59.000Z

295

Non-linear dynamic of rotor-stator system with non-linear bearing clearance  

E-Print Network (OSTI)

The study deals with a rotor-stator contact inducing vibration in rotating machinery. A numerical rotor-stator system, including a non-linear bearing with Hertz contact and clearance is considered. To determine the non-linear responses of this system, non-linear dynamic equations can be integrated numerically. However, this procedure is both time consuming and costly to perform. The aim of this Note is to apply the Alternate Frequency/Time Method and the 'path following continuation' in order to obtain the non-linear responses to this problem. Then the orbits of rotor and stator responses at various speeds are investigated.

Sinou, Jean-Jacques

2008-01-01T23:59:59.000Z

296

On chiral symmetry in extended nonlinear supersymmetry  

E-Print Network (OSTI)

We study the equations of the motion for Nambu-Goldstone (NG) fermions in the nonlinear representation of supersymmetry (NLSUSY) and show in N-extended NLSUSY that those equations under massless conditions are satisfied, provided the NG fermions are chiral eigenstates. The physical significance of the result is discussed in the context of NLSUSY general relativity through the relations between nonlinear and linear SUSY theories, which gives a new insight into the chiral symmetry for the low energy particle physics.

Kazunari Shima; Motomu Tsuda

2013-11-18T23:59:59.000Z

297

Interactions and Focusing of Nonlinear Water Waves  

E-Print Network (OSTI)

The coupled cubic nonlinear Schr\\"odinger (CNLS) equations are used to study modulational instabilities of a pair of nonlinearly interacting two-dimensional waves in deep water. It has been shown that the full dynamics of these interacting waves gives rise to localized large-amplitude wavepackets (wave focusing). In this short letter we attempt to verify this result numerically using a Fourier spectral method for the CNLS equations.

Harihar Khanal; Stefan C. Mancas; Shahrdad Sajjadi

2013-01-17T23:59:59.000Z

298

Seismic analysis of piping with nonlinear supports  

Science Conference Proceedings (OSTI)

The modeling and results of nonlinear time-history seismic analyses for three sizes of pipelines restrained by mechanical snubbes are presented. Numerous parametric analyses were conducted to obtain sensitivity information which identifies relative importance of the model and analysis ingredients. Special considerations for modeling the pipe clamps and the mechanical snubbers based on experimental characterization data are discussed. Comparisions are also given of seismic responses, loads and pipe stresses predicted by standard response spectra methods and the nonlinear time-history methods.

Barta, D.A.; Huang, S.N.; Severud, L.K.

1980-01-01T23:59:59.000Z

299

Domain decomposition strategies for nonlinear flow problems in porous media  

Science Conference Proceedings (OSTI)

Domain decomposition (DD) methods, such as the additive Schwarz method, are almost exclusively applied to linearized equations. In the context of nonlinear problems, these linear systems appear as part of a Newton iteration. However, applying DD methods ... Keywords: ASPIN, Domain decomposition, Nonlinear multiphase flow, Nonlinear preconditioning, Nonlinear solvers, Porous media

Jan Ole Skogestad; Eirik Keilegavlen; Jan M. Nordbotten

2013-02-01T23:59:59.000Z

300

Parameter estimation and compensation in systems with nonlinearly parameterized perturbations  

Science Conference Proceedings (OSTI)

We consider a class of systems influenced by perturbations that are nonlinearly parameterized by unknown constant parameters, and develop a method for estimating the unknown parameters. The method applies to systems where the states are available for ... Keywords: Adaptive control, Nonlinear observer design, Nonlinear system control, Uncertain nonlinear systems

Håvard Fjær Grip; Tor A. Johansen; Lars Imsland; Glenn-Ole Kaasa

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

TotalView Parallel Debugger at NERSC  

NLE Websites -- All DOE Office Websites (Extended Search)

Totalview Totalview Totalview Description TotalView from Rogue Wave Software is a parallel debugging tool that can be run with up to 512 processors. It provides both X Windows-based Graphical User Interface (GUI) and command line interface (CLI) environments for debugging. The performance of the GUI can be greatly improved if used in conjunction with free NX software. The TotalView documentation web page is a good resource for learning more about some of the advanced TotalView features. Accessing Totalview at NERSC To use TotalView at NERSC, first load the TotalView modulefile to set the correct environment settings with the following command: % module load totalview Compiling Code to Run with TotalView In order to use TotalView, code must be compiled with the -g option. We

302

A H-infinity Fault Detection and Diagnosis Scheme for Discrete Nonlinear System Using Output Probability Density Estimation  

Science Conference Proceedings (OSTI)

In this paper, a H-infinity fault detection and diagnosis (FDD) scheme for a class of discrete nonlinear system fault using output probability density estimation is presented. Unlike classical FDD problems, the measured output of the system is viewed as a stochastic process and its square root probability density function (PDF) is modeled with B-spline functions, which leads to a deterministic space-time dynamic model including nonlinearities, uncertainties. A weighting mean value is given as an integral function of the square root PDF along space direction, which leads a function only about time and can be used to construct residual signal. Thus, the classical nonlinear filter approach can be used to detect and diagnose the fault in system. A feasible detection criterion is obtained at first, and a new H-infinity adaptive fault diagnosis algorithm is further investigated to estimate the fault. Simulation example is given to demonstrate the effectiveness of the proposed approaches.

Zhang Yumin; Lum, Kai-Yew [Temasek Laboratories, National University of Singapore, Singapore 117508 (Singapore); Wang Qingguo [Depa. Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore)

2009-03-05T23:59:59.000Z

303

Adaptation of user views to business requirements: towards adaptive views models  

Science Conference Proceedings (OSTI)

This article describes an approach to model user views in service-oriented groupware systems in order to support the adaptation of views in collaborative projects environments. The issue is to adapt the visualization to the users' business requirements ... Keywords: AEC (architecture engineering construction), CSCW, information visualization, model driven engineering, user view, user view model

Conrad Boton; Sylvain Kubicki; Gilles Halin

2010-09-01T23:59:59.000Z

304

A Regulator's View of Cogeneration  

E-Print Network (OSTI)

The Pennsylvania Public Utility Commission regulates essentially all types of public utilities and has the authority to investigate issues of public interest. To establish a point of reference, Pennsylvania's utilities contribute about 5 percent of the total national electric generation. In view of the energy requirements of Pennsylvania's industry and the impact of increasing energy costs on employment the Commission directed its technical staff to investigate the potential for industrial cogeneration and a pricing formula consistent with the electric utilities' costs. The Commission's technical staff has completed proposed regulations to implement the provisions of the Public Utility Regulatory Policies Act (PURPA) Section 210 concerning small power producers. The regulations incorporate suggestions from both potential producers and utilities. Staff has devised a strategy for utility purchases of energy and capacity which should be of interest to regulators in other jurisdictions, encourage potential cogenerators and satisfy utilities.

Shanaman, S. M.

1982-01-01T23:59:59.000Z

305

Input-output theory for waveguide QED with an ensemble of inhomogeneous atoms  

E-Print Network (OSTI)

We study the collective effects that emerge in waveguide quantum electrodynamics where several (artificial) atoms are coupled to a one-dimensional (1D) superconducting transmission line. Since single microwave photons can travel without loss for a long distance along the line, real and virtual photons emitted by one atom can be reabsorbed or scattered by a second atom. Depending on the distance between the atoms, this collective effect can lead to super- and subradiance or to a coherent exchange-type interaction between the atoms. Changing the artificial atoms transition frequencies, something which can be easily done with superconducting qubits (two levels artificial atoms), is equivalent to changing the atom-atom separation and thereby opens the possibility to study the characteristics of these collective effects. To study this waveguide quantum electrodynamics system, we extend previous work and present an effective master equation valid for an ensemble of inhomogeneous atoms. Using input-output theory, we compute analytically and numerically the elastic and inelastic scattering and show how these quantities reveal information about collective effects. These theoretical results are compatible with recent experimental results using transmon qubits coupled to a superconducting one-dimensional transmission line [A.F. van Loo {\\it et al.} (2013)].

Kevin Lalumière; Barry C. Sanders; Arjan F. van Loo; Arkady Fedorov; Andreas Wallraff; Alexandre Blais

2013-05-30T23:59:59.000Z

306

Nonlinear Dynamics of Single Bunch Instability  

SciTech Connect

A nonlinear equation is derived that governs the evolution of the amplitude of unstable oscillations with account of quantum diffusion effects due to the synchrotron radiation. Numerical solutions to this equation predict a variety of possible scenarios of nonlinear evolution of the instability some of which are in good qualitative agreement with experimental observations. Microwave single bunch instability in circular accelerators has been observed in many machines. The instability usually arises when the number of particles in the bunch exceeds some critical value, Nc, which varies depending on the parameters of the accelerating regime. Recent observations on the SLC damping rings at SLAC with a new low-impedance vacuum chamber revealed new interesting features of the instability. In some cases, after initial exponential growth, the instability eventually saturated at a level that remained constant through the accumulation cycle. In other regimes, relaxation-type oscillations were measured in nonlinear phase of the instability. In many cases, the instability was characterized by a frequency close to the second harmonic of the synchrotron oscillations. Several attempts have been made to address the nonlinear stage of the instability based on either computer simulations or some specific assumptions regarding the structure of the unstable mode. An attempt of a more general consideration of the problem is carried out in this paper. We adopt an approach recently developed in plasma physics for analysis of nonlinear behavior of weakly unstable modes in dynamic systems. Assuming that the growth rate of the instability is much smaller than its frequency, we find a time dependent solution to Vlasov equation and derive an equation for the complex amplitude of the oscillations valid in the nonlinear regime. Numerical solutions to this equation predict a variety of possible scenarios of nonlinear evolution of the instability some of which are in good qualitative agreement with experimental observations.

Stupakov, G.V.; /SLAC; Breizman, B.N.; Pekker, M.S.; /Texas U.

2011-09-09T23:59:59.000Z

307

On some nonlinear partial differential equations for classical and quantum many body systems  

E-Print Network (OSTI)

atomic gases, but also for nonlinear optics and shallow water waves. From the mathematical point of view, it is a dispersive semilinear equa- tion exhibiting many interesting phenomena such as the existence of solitons, scattering, blow-up, and global... of particles remains roughly constant with respect to N , we expect that the average density N?1 ? x?TdN ?(x) does not scale with N . The zero range process has only one conserved quantity, the total number of particles, and hence the particle density...

Marahrens, Daniel

2012-11-13T23:59:59.000Z

308

Reaction-diffusion systems and nonlinear waves  

E-Print Network (OSTI)

The authors investigate the solution of a nonlinear reaction-diffusion equation connected with nonlinear waves. The equation discussed is more general than the one discussed recently by Manne, Hurd, and Kenkre (2000). The results are presented in a compact and elegant form in terms of Mittag-Leffler functions and generalized Mittag-Leffler functions, which are suitable for numerical computation. The importance of the derived results lies in the fact that numerous results on fractional reaction, fractional diffusion, anomalous diffusion problems, and fractional telegraph equations scattered in the literature can be derived, as special cases, of the results investigated in this article.

R. K. Saxena; A. M. Mathai; H. J. Haubold

2006-04-21T23:59:59.000Z

309

Nonlinear nanomechanical oscillators for ultrasensitive inertial detection  

DOE Patents (OSTI)

A system for ultrasensitive mass and/or force detection of this invention includes a mechanical oscillator driven to oscillate in a nonlinear regime. The mechanical oscillator includes a piezoelectric base with at least one cantilever resonator etched into the piezoelectric base. The cantilever resonator is preferably a nonlinear resonator which is driven to oscillate with a frequency and an amplitude. The system of this invention detects an amplitude collapse of the cantilever resonator at a bifurcation frequency as the cantilever resonator stimulated over a frequency range. As mass and/or force is introduced to the cantilever resonator, the bifurcation frequency shifts along a frequency axis in proportion to the added mass.

Datskos, Panagiotis George; Lavrik, Nickolay V

2013-08-13T23:59:59.000Z

310

Nonlinear conformal-degree preserving Dirac equations  

E-Print Network (OSTI)

Nonlinear Dirac equations in D+1 space-time are obtained by variation of the spinor action whose Lagrangian components have the same conformal degree and the coupling parameter of the self-interaction term is dimensionless. In 1+1 dimension, we show that these requirements result in the "conventional" quartic form of the nonlinear interaction and present the general equation for various coupling modes. These include, but not limited to, the Thirring and Gross-Neveu models. We obtain a numerical solution for the special case of the spin and pseudo-spin symmetric modes..

A. D. Alhaidari

2012-12-25T23:59:59.000Z

311

Nonlinearities in modified gravity cosmology: Signatures of modified gravity in the nonlinear matter power spectrum  

SciTech Connect

A large fraction of cosmological information on dark energy and gravity is encoded in the nonlinear regime. Precision cosmology thus requires precision modeling of nonlinearities in general dark energy and modified gravity models. We modify the Gadget-2 code and run a series of N-body simulations on modified gravity cosmology to study the nonlinearities. The modified gravity model that we investigate in the present paper is characterized by a single parameter {zeta}, which determines the enhancement of particle acceleration with respect to general relativity (GR), given the identical mass distribution ({zeta}=1 in GR). The first nonlinear statistics we investigate is the nonlinear matter power spectrum at k < or approx. 3h/Mpc, which is the relevant range for robust weak lensing power spectrum modeling at l < or approx. 2000. In this study, we focus on the relative difference in the nonlinear power spectra at corresponding redshifts where different gravity models have the same linear power spectra. This particular statistics highlights the imprint of modified gravity in the nonlinear regime and the importance of including the nonlinear regime in testing GR. By design, it is less susceptible to the sample variance and numerical artifacts. We adopt a mass assignment method based on wavelet to improve the power spectrum measurement. We run a series of tests to determine the suitable simulation specifications (particle number, box size, and initial redshift). We find that, the nonlinear power spectra can differ by {approx}30% for 10% deviation from GR (|{zeta}-1|=0.1) where the rms density fluctuations reach 10. This large difference, on one hand, shows the richness of information on gravity in the corresponding scales, and on the other hand, invalidates simple extrapolations of some existing fitting formulae to modified gravity cosmology.

Cui Weiguang; Zhang Pengjie; Yang Xiaohu [Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Partner Group of MPA, Nandan Road 80, Shanghai, 200030 (China)

2010-05-15T23:59:59.000Z

312

Optical modulation at around 1550 nm in a InGaAlAs optical waveguide containing a InGaAs/AlAs resonant tunnelling diode  

E-Print Network (OSTI)

We report electro-absorption modulation of light at around 1550 nm in a unipolar InGaAlAs optical waveguide containing a InGaAs/AlAs double-barrier resonant tunneling diode (DB-RTD). The RTD peak-to-valley transition increases the electric field across the waveguide, which shifts the core material absorption band-edge to longer wavelengths via the Franz-Keldysh effect, thus changing the light-guiding characteristics of the waveguide. Low-frequency characterisation of a device shows modulation up to 28 dB at 1565 nm. When dc biased close to the negative differential conductance (NDC) region, the RTD optical waveguide behaves as an electro-absorption modulator integrated with a wide bandwidth electrical amplifier, offering a potential advantage over conventional pn modulators.

Figueiredo, J M L; Stanley, C R; Ironside, C N; McMeekin, S G; Leite, A M P

1999-01-01T23:59:59.000Z

313

Anyon-Fermion Mapping and Applications to Ultracold Gases in Tight Waveguides  

SciTech Connect

The Fermi-Bose mapping method for one-dimensional Bose and Fermi gases with zero-range interactions is generalized to an anyon-fermion mapping and applied to exact solution of several models of ultracold gases with anyonic exchange symmetry in tight waveguides: anyonic Calogero-Sutherland model, anyons with point hard-core interaction (anyonic Tonks-Girardeau gas), and spin-aligned anyon gas with infinite zero-range odd-wave attractions (attractive anyonic Tonks-Girardeau, or AATG, gas). It is proved that for even N{>=}4 there are states of the AATG gas on A, with anyonic phase slips which are odd integral multiples of {pi}/(N-1), of energy lower than that of the corresponding fermionic ground state. A generalization to a spinor Fermi gas state with anyonic symmetry under purely spatial exchange enables energy lowering by the same mechanism.

Girardeau, M. D. [College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)

2006-09-08T23:59:59.000Z

314

Soluble Models of Strongly Interacting Ultracold Gas Mixtures in Tight Waveguides  

Science Conference Proceedings (OSTI)

A Fermi-Bose mapping method is used to determine the exact ground states of several models of mixtures of strongly interacting ultracold gases in tight waveguides, which are generalizations of the Tonks-Girardeau (TG) gas (1D Bose gas with point hard cores) and fermionic Tonks-Girardeau (FTG) gas (1D spin-aligned Fermi gas with infinitely strong zero-range attractions). We detail the case of a Bose-Fermi mixture with TG boson-boson (BB) and boson-fermion (BF) interactions. Exact results are given for density profiles in a harmonic trap, single-particle density matrices, momentum distibutions, and density-density correlations. Since the ground state is highly degenerate, we analyze the splitting of the ground manifold for large but finite BB and BF repulsions.

Girardeau, M. D. [College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States); Minguzzi, A. [Laboratoire de Physique et Modelisation des Mileux Condenses, C.N.R.S., B.P. 166, 38042 Grenoble (France)

2007-12-07T23:59:59.000Z

315

Guiding of 35 TW laser pulses in ablative capillary discharge waveguides  

Science Conference Proceedings (OSTI)

An ablatively driven capillary discharge plasma waveguide has been used to demonstrate guiding of 30 fs, 35 TW laser pulses over distances up to 3 cm with incident intensity in excess of 4x10{sup 18} W/cm{sup 2}. The plasma density range over which good guiding was observed was 1-3x10{sup 18} cm{sup -3}. The quality of the laser spot at the exit mode was observed to be similar to that at the entrance and the transmitted energy was {approx}25% at input powers of 35 TW. The transmitted laser spectrum typically showed blueshifting due to ionization of carbon and hydrogen atoms in the capillary plasma by the high intensity laser pulse. The low plasma density regime in which these capillaries operate makes these devices attractive for use in single stage electron accelerators to multi-GeV energies driven by petawatt class laser systems.

McGuffey, C.; Matsuoka, T.; Chvykov, V.; Kalintchenko, G.; Rousseau, P.; Yanovsky, V.; Maksimchuk, A.; Krushelnick, K. [Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109 (United States); Levin, M.; Zigler, A. [Hebrew University, Jerusalem 91904 (Israel)

2009-11-15T23:59:59.000Z

316

Electromagnetic field of a charge intersecting a cold plasma boundary in a waveguide  

SciTech Connect

We analyze the electromagnetic field of a charge crossing a boundary between a vacuum and cold plasma in a waveguide. We obtain exact expressions for the field components and the spectral density of the transition radiation. With the steepest descent technique, we investigate the field components. We show that the electromagnetic field has a different structure in a vacuum than in cold plasma. We also develop an algorithm for the computation of the field based on a certain transformation of the integration path. The behavior of the field depending on distance and time and the spectral density depending on frequency are explored for different charge velocities. Some important physical effects are noted. A considerable increase and concentration of the field near the wave front in the plasma is observed for the case of ultrarelativistic particles. In the plasma, the mode envelopes and spectral density show zero points when the charge velocity is within certain limits.

Alekhina, Tatiana Yu.; Tyukhtin, Andrey V. [Radiophysics Department of St. Petersburg University, 1 Ulyanovskaya, St. Petersburg 198504 (Russian Federation)

2011-06-15T23:59:59.000Z

317

Discrete spectrum of a pair of nonsymmetric waveguides coupled by a window  

E-Print Network (OSTI)

In the paper we study the discrete spectrum of a pair of quantum two-dimensional waveguides having common boundary in which a window of finite length is cut out. We study the phenomenon of new eigenvalues emerging from the threshold of the essential spectrum when the length of window passes through critical values. We construct the asymptotics expansions for the emerging eigenvalues with respect to small parameter which is the difference between current length of the window and the nearest critical value. We also study the behaviour of the spectrum when the length of the window increases unboundedly and construct asymptotics expansions with respect to great parameter which is a length of the window.

Denis I. Borisov

2005-12-20T23:59:59.000Z

318

Answering XML queries using materialized views revisited  

Science Conference Proceedings (OSTI)

Answering queries using views is a well-established technique in databases. In this context, two outstanding problems can be formulated. The first one consists in deciding whether a query can be answered exclusively using one or multiple materialized ... Keywords: XML, materialized views, xpath query evaluation

Xiaoying Wu; Dimitri Theodoratos; Wendy Hui Wang

2009-11-01T23:59:59.000Z

319

Query and update through XML views  

Science Conference Proceedings (OSTI)

XML has become a standard medium for data exchange, and XML views are frequently used as an interface to relational database and XML data. There have been a considerable number of studies on building and querying XML views, while updating related topics ...

Gao Cong

2007-10-01T23:59:59.000Z

320

Designing presentations for on-demand viewing  

Science Conference Proceedings (OSTI)

Increasingly often, presentations are given before a live audience, while simultaneously being viewed remotely and recorded for subsequent viewing on-demand over the Web. How should video presentations be designed for web access? How is video accessed ... Keywords: digital library, streaming media, video on-demand

Liwei He; Jonathan Grudin; Anoop Gupta

2000-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Nonlinear Motion of a Shallow Water Barotropic Vortex  

Science Conference Proceedings (OSTI)

Nonlinear motions of a shallow water barotropic vortex on a ? plane differ substantially from the analogous linear motions. The nonlinear model described here, in which wavenumber 1–3 asymmetries interact with each other and the mean vortex, ...

H. E. Willoughby

1994-12-01T23:59:59.000Z

322

Nonlinear predictive models: overview and possibilities in speaker recognition  

Science Conference Proceedings (OSTI)

In this paper we give a brief overview of speaker recognition with special emphasis on nonlinear predictive models, based on neural nets. Main challenges and possibilities for nonlinear feature extraction are described, and experimental results of several ...

Marcos Faundez-Zanuy; Mohamed Chetouani

2007-01-01T23:59:59.000Z

323

Nonlinear stochastic system identification techniques for biological tissues/  

E-Print Network (OSTI)

This research develops a device capable of measuring the nonlinear dynamic mechanical properties of human tissue in vivo. The enabling technology is the use of nonlinear stochastic system identification techniques in ...

Chen, Yi, S.M. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

324

Nonlinear Evolution of Linearly Unstable Barotropic Boundary Currents  

Science Conference Proceedings (OSTI)

The nonlinear evolution of linearly unstable barotropic boundary currents, consisting of three piecewise uniform vorticity regions, was investigated using the contour dynamics method. A physical interpretation of the nonlinear behavior of the ...

Koji Shimada; Atsushi Kubokawa

1997-07-01T23:59:59.000Z

325

Nonlinear Effects on Convectively Forced Two-Dimensional Mesoscale Flows  

Science Conference Proceedings (OSTI)

One of the important problems in mesoscale atmospheric dynamics is how the atmosphere responds to convective heating or cooling. Here, the authors examine nonlinear effects on convectively forced mesoscale flows in the context of the nonlinear ...

Ji-Young Han; Jong-Jin Baik

2012-11-01T23:59:59.000Z

326

Nonlinear springs with applications to flow regulation valves and mechanisms  

E-Print Network (OSTI)

This thesis focuses on the application of nonlinear springs for fluid flow control valves where geometric constraints, or fabrication technologies, limit the use of available solutions. Types of existing nonlinear springs ...

Freeman, David Calvin

2008-01-01T23:59:59.000Z

327

The Buoyancy Budget with a Nonlinear Equation of State  

Science Conference Proceedings (OSTI)

The nonlinear equation of state of seawater introduces a sink or source of buoyancy when water parcels of unequal salinities and temperatures are mixed. This article contains quantitative estimates of these nonlinear effects on the buoyancy budget ...

Magnus Hieronymus; Jonas Nycander

2013-01-01T23:59:59.000Z

328

MEASURING NONLINEAR MOMENTUM COMPACTION IN RHIC.  

Science Conference Proceedings (OSTI)

The chromatic nonlinearity parameter, {alpha}{sub 1}, has a strong impact on longitudinal dynamics in the vicinity of transition [1,2,3]. Measurements of the synchrotron frequency as a function of radius are used to constrain the value of {alpha}{sub 1}.

BLASKIEWICZ,M.; BRENNAN,J.M.; CAMERON,P.; DREES,A.; KEWISH,J.; ROSER,T.; SMITH,K.; TANG,C.

2001-06-18T23:59:59.000Z

329

Anomalous optical nonlinearity of dielectric nanodispersions  

SciTech Connect

We present the results of studying the nonlinear optical response of nanodispersions of semiconductor (TiO{sub 2}, ZnO) and dielectric (SiO{sub 2}, Al{sub 2}O{sub 3}) nanoparticles of spherical, spheroidal and flake shape, suspended in polar and nonpolar dielectric matrices (water, isopropanol, polymethylsiloxane and transformer oil) by means of z-scanning in the field of low-intensity visible laser radiation. It is found that, unlike semiconductor nanoparticles and particles of spherical shape, flake-shaped SiO{sub 2} and Al{sub 2}O{sub 3} nanoparticles suspended in nonpolar matrices exhibit nonlinear optical response within the intensity interval from 0 to 500 W cm{sup -2} that vanishes at higher intensities. The diagrams of energy states of the optical electrons in nanoparticles that allow explanation of differences in the nonlinear-optical properties of nanodispersions are proposed. Good agreement between the experimental and theoretical dependences of nonlinear refractive indices and absorption coefficients on the intensity of radiation is observed. (optical nanostructures)

Milichko, V A; Dzyuba, V P; Kul'chin, Yurii N

2013-06-30T23:59:59.000Z

330

The Fusion of Isolated Nonlinear Eddies  

Science Conference Proceedings (OSTI)

The interaction of two isolated lens-like eddies is examined with the aid of an inviscid nonlinear model. The barotropic layer in which the lenses are embedded is infinitely deep so that there is no interaction between the eddies unless their ...

Doron Nof

1988-06-01T23:59:59.000Z

331

NON-LINEAR DYNAMICS IDENTIFICATION USING  

E-Print Network (OSTI)

to be identified and extracted from the data. The above work is applied to a real physical wind turbine data 143 5 Case Study: Identification of Wind Turbine Dynamics Using Gaussian Processes 145 5 Turbine Dynamics 147 5.3.1 About the Data 148 5.3.2 Cleaning Up Raw Data (Phase 1) 152 5.3.3 Nonlinear

Duffy, Ken

332

Nonlinear spectral density estimation: thresholding the correlogram  

E-Print Network (OSTI)

in a nonlinear way. The rate of convergence of the new estimators is quantified, and practical issues estimation of the spectral density function; examples include astronomy, economics, electrical engineering Einstein (1914); see Brillinger (1993) for a historical perspective. The prevalent spectral estimation

Politis, Dimitris N.

333

DARK ENERGY AND NON–LINEAR PERTURBATIONS  

E-Print Network (OSTI)

Dark energy might have an influence on the formation of non–linear structures during the cosmic history. For example, in models in which dark energy couples to dark matter, it will be non–homogeneous and will influence on the collapse of a dark matter overdensity. We use the spherical collapse model to estimate how much influence dark energy might have. 1.

C. Van; De Bruck; D. F. Mota

2005-01-01T23:59:59.000Z

334

Dark Energy and Non-linear Perturbations  

E-Print Network (OSTI)

Dark energy might have an influence on the formation of non--linear structures during the cosmic history. For example, in models in which dark energy couples to dark matter, it will be non--homogeneous and will influence the collapse of a dark matter overdensity. We use the spherical collapse model to estimate how much influence dark energy might have.

C. van de Bruck; D. F. Mota

2005-01-14T23:59:59.000Z

335

Nonlinear Response to Anomalous Tropical Forcing  

Science Conference Proceedings (OSTI)

We have investigated the nonlinear steady-state response of a barotropic model to an estimate of the observed anomalous tropical divergence forcing for the El Niño winter of 1982/83. The 400 mb climatological flow was made a forced solution of ...

R. J. Haarsma; J. D. Opsteegh

1989-11-01T23:59:59.000Z

336

Nonlinear texture modeling of mesophase carbon fibers  

Science Conference Proceedings (OSTI)

This paper presents a theoretical and computational nonlinear study of structure selection in carbon fibers obtained by spinning binary blends of carbonaceous mesophases precursors. Although models for single component mesophase precursors seem to capture ... Keywords: carbonaceous mesophase, multiple solution, nematic liquid crystals, texture

M. Golmohammadi; A. D. Rey

2007-05-01T23:59:59.000Z

337

Ryan: rendering your animation nonlinearly projected  

Science Conference Proceedings (OSTI)

Artistic rendering is an important research area in Computer Graphics, yet relatively little attention has been paid to the projective properties of computer generated scenes. Motivated by the surreal storyboard of an animation in production---Ryan---this ... Keywords: Non-Photorealistic Rendering, local illumination, multiprojection, nonlinear perspective

Patrick Coleman; Karan Singh

2004-06-01T23:59:59.000Z

338

Base line estimation using sparse nonlinear operators  

Science Conference Proceedings (OSTI)

Efficient nonlinear operators for base line estimation of high energy physics detector signals are introduced. Due to the high processing rate requirements the operators are simplified using sparse input sequences. The operators are a sparse order statistic ... Keywords: base line estimation, filter training, order statistic filter

Sami J. Inkinen; Yrjö Neuvo

2002-05-01T23:59:59.000Z

339

Global Optimization with Nonlinear Ordinary Differential Equations  

Science Conference Proceedings (OSTI)

This paper examines global optimization of an integral objective function subject to nonlinear ordinary differential equations. Theory is developed for deriving a convex relaxation for an integral by utilizing the composition result defined by McCormick ... Keywords: Convex relaxations, dynamic optimization, nonquasimonotone differential equations

Adam B. Singer; Paul I. Barton

2006-02-01T23:59:59.000Z

340

Nonlinear MHD instabilities in elongated cylinders  

SciTech Connect

The nonlinear evolution of fixed-boundary instabilities was studied using a 3-D ideal-MHD computer simulation. The effect of elongation and peaked profile is studied. It is found that the dominant process is convection around essentially fixed velocity vortex cells. (auth)

Bateman, G.; Hicks, H.R.; Wooten, J.W.

1975-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

A nonlinear approach to harmonic signal modeling  

Science Conference Proceedings (OSTI)

Periodic signals can be estimated recursively by exploiting the fact that a sine wave passing through a static nonlinear function generates a spectrum of overtones. A real wave with unknown period in cascade with a piecewise linear function is thefefore ... Keywords: Wiener model structure, frequency estimation, harmonic modeling, local convergence, recursive identification

Emad Abd-Elrady

2004-01-01T23:59:59.000Z

342

QUANTUM STOCHASTIC CALCULUS AND QUANTUM NONLINEAR FILTERING  

E-Print Network (OSTI)

QUANTUM STOCHASTIC CALCULUS AND QUANTUM NONLINEAR FILTERING V. P. BELAVKIN Abstract. A ?­algebraic inde...nite structure of quantum stochastic (QS) cal- culus is introduced and a continuity property...nitely dimensional nuclear space. The class of nondemolition output QS processes in quantum open systems

Belavkin, Viacheslav P.

343

User_Sup_ViewEmpMatrix  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

an Employee Matrix (Supervisor) an Employee Matrix (Supervisor) © 2011 SuccessFactors, Inc. - 1 - SuccessFactors Learning Confidential. All rights reserved. Job Aid: Viewing an Employee Matrix (Supervisor) Purpose The purpose of this job aid is to guide supervisor users through the step-by-step process of viewing an employee matrix within SuccessFactors Learning. Task A. View an Employee Matrix From the Home page, click the My Employees tab. Click the Employee Matrix supervisor link. Click the Change Measures expand arrow ( ) to select criteria for comparison. View an Employee Matrix 8 Steps Task A 3 3 1 1 2 2 SuccessFactors Learning v 6.4 User Job Aid Viewing an Employee Matrix (Supervisor) © 2011 SuccessFactors, Inc. - 2 - SuccessFactors Learning Select a measure for the

344

Mountain View Grand | Open Energy Information  

Open Energy Info (EERE)

Grand Grand Jump to: navigation, search Name Mountain View Grand Facility Mountain View Grand Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Mountain View Grand Developer Sustainable Energy Developments Energy Purchaser Mountain View Grand Location Mountain View Grand Resort & Spa NH Coordinates 44.397987°, -71.590306° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.397987,"lon":-71.590306,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

345

Applicability of Nonlinear Multiple-Degree-of-Freedom ...  

Science Conference Proceedings (OSTI)

... GCR 10-917-9 List of Figures – Supporting Documentation xxiii Figure F-9 Typical nonlinear HSS brace axial hinge ..... ...

2011-02-22T23:59:59.000Z

346

Single-photon nonlinear optics with graphene plasmons  

E-Print Network (OSTI)

We show theoretically that it is possible to realize significant nonlinear optical interactions at the few photon level in graphene nanostructures. Our approach takes advantage of the electric field enhancement associated with the strong confinement of graphene plasmons and the large intrinsic nonlinearity of graphene. Such a system could provide a powerful platform for quantum nonlinear optical control of light. As an example, we consider an integrated optical device that exploits this large nonlinearity to realize a single photon switch.

M. Gullans; D. E. Chang; F. H. L. Koppens; F. J. García de Abajo; M. D. Lukin

2013-09-10T23:59:59.000Z

347

Search and View a Service Request Search and View a Service Request,vlr  

E-Print Network (OSTI)

FAMIS Search and View a Service Request Search and View a Service Request,vlr 10/6/2012 © 2012 Northwestern University 1 Search and View a Service Request This training guide will show you how to search completion of this guide you will be able to: · Sign in to FAMIS Self Service · Search for service requests

Shull, Kenneth R.

348

Nonlinear Krylov and moving nodes in the method of lines  

Science Conference Proceedings (OSTI)

We report on some successes and problem areas in the Method of Lines from our work with moving node finite element methods. First, we report on our ''nonlinear Krylov accelerator'' for the modified Newton's method on the nonlinear equations of our stiff ... Keywords: Iterative linear solver, Method of lines, Moving finite elements, Moving node finite elements, Nonlinear Krylov method

Keith Miller

2005-11-01T23:59:59.000Z

349

Modeling and prediction of nonlinear environmental system using Bayesian methods  

Science Conference Proceedings (OSTI)

An environmental dynamic system is usually modeled as a nonlinear system described by a set of nonlinear ODEs. A central challenge in computational modeling of environmental systems is the determination of the model parameters. In these cases, estimating ... Keywords: Extended Kalman filter, Leaf area index and soil moisture model, Nonlinear environmental system, Particle filter, State and parameter estimation, Variational filter

Majdi Mansouri; Benjamin Dumont; Marie-France Destain

2013-03-01T23:59:59.000Z

350

2007 Special Issue: Nonlinear principal component analysis of noisy data  

Science Conference Proceedings (OSTI)

With very noisy data, having plentiful samples eliminates overfitting in nonlinear regression, but not in nonlinear principal component analysis (NLPCA). To overcome this problem in NLPCA, a new information criterion (IC) is proposed for selecting the ... Keywords: Autoassociative neural network, El Niño, ENSO, Information criterion, Model selection, Nonlinear principal component analysis, Quasi-biennial oscillation, Regularization

William W. Hsieh

2007-05-01T23:59:59.000Z

351

Advanced (AI-Based) Nonlinear Controllers for Industrial Processes -  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced (AI-Based) Nonlinear Controllers for Industrial Processes Advanced (AI-Based) Nonlinear Controllers for Industrial Processes Capabilities Nuclear Systems Technologies Nuclear Criticality Safety Research Reactor Analysis Decontamination and Decommissioning Systems/Process Monitoring, Diagnostics and Control Overview Process Monitoring & Signal Validation Diagnostic & Advisory Systems Advanced (AI-based) Nonlinear Controllers for Industrial Processes Artificial intelligence Other Capabilities Work with Argonne Contact us For Employees Site Map Help Systems/Process Monitoring, Diagnostics and Control Advanced (AI-Based) Nonlinear Controllers for Industrial Processes Bookmark and Share Advanced (AI-Based) Nonlinear Controllers for Industrial Processes The overall objective of this research is to explore and demonstrate the

352

Overview of magnetic nonlinear beam dynamics in the RHIC  

SciTech Connect

In this article we review our studies of nonlinear beam dynamics due to the nonlinear magnetic field errors in the Relativistic Heavy Ion Collider (RHIC). Nonlinear magnetic field errors, including magnetic field errors in interaction regions (IRs), chromatic sextupoles, and sextupole components from arc main dipoles are discussed. Their effects on beam dynamics and beam dynamic aperture are evaluated. The online methods to measure and correct the IR nonlinear field errors, second order chromaticities, and horizontal third order resonance are presented. The overall strategy for nonlinear corrections in RHIC is discussed.

Luo,Y.; Bai, M.; Beebe-Wang, J.; Bengtsson, J.; Calaga, R.; Fischer, W.; Jain, A.; Pilat, f.; Ptitsyn, V.; Malitsky, N.; Robert-Demolaize, g.; Satogata, T.; Tepikian, S.; Tomas, R.; Trbojevic, D.

2009-05-04T23:59:59.000Z

353

Nonlinear Time-Reversal of Classical Waves: Experiment and Model  

E-Print Network (OSTI)

We consider time-reversal of electromagnetic waves in a closed, wave-chaotic system containing a discrete, passive, harmonic-generating nonlinearity. An experimental system is constructed as a time-reversal mirror, in which excitations generated by the nonlinearity are gathered, time-reversed, transmitted, and directed exclusively to the location of the nonlinearity. Here we show that such nonlinear objects can be purely passive (as opposed to the active nonlinearities used in previous work), and develop a high-rate secure communication system based on nonlinear time-reversal. A model of the experimental system is developed, using a star-graph network of transmission lines, with one of the lines terminated by a model diode. The model simulates time-reversal of linear and nonlinear signals, demonstrates features seen in the experimental system, and supports our interpretation of the experimental results.

Matthew Frazier; Biniyam Taddese; Bo Xiao; Thomas Antonsen; Edward Ott; Steven M. Anlage

2013-08-15T23:59:59.000Z

354

Simplified Model of Nonlinear Landau Damping  

SciTech Connect

The nonlinear interaction of a plasma wave with resonant electrons results in a plateau in the electron distribution function close to the phase velocity of the plasma wave. As a result, Landau damping of the plasma wave vanishes and the resonant frequency of the plasma wave downshifts. However, this simple picture is invalid when the external driving force changes the plasma wave fast enough so that the plateau cannot be fully developed. A new model to describe amplification of the plasma wave including the saturation of Landau damping and the nonlinear frequency shift is proposed. The proposed model takes into account the change of the plasma wave amplitude and describes saturation of the Landau damping rate in terms of a single fluid equation, which simplifies the description of the inherently kinetic nature of Landau damping. A proposed fluid model, incorporating these simplifications, is verified numerically using a kinetic Vlasov code.

N. A. Yampolsky and N. J. Fisch

2009-07-16T23:59:59.000Z

355

Stable nonlinear Mach-Zehnder fiber switch  

DOE Patents (OSTI)

An all-optical fiber switch is implemented within a short Mach-Zehnder interferometer configuration. The Mach-Zehnder switch is constructed to have a high temperature stability so as to minimize temperature gradients and other thermal effects which result in undesirable instability at the output of the switch. The Mach-Zehnder switch of the preferred embodiment is advantageously less than 2 cm in length between couplers to be sufficiently short to be thermally stable, and full switching is accomplished by heavily doping one or both of the arms between the couplers so as to provide a highly nonlinear region within one or both of the arms. A pump input source is used to affect the propagation characteristics of one of the arms to control the output coupling ratio of the switch. Because of the high nonlinearity of the pump input arm, low pump powers can be used, thereby alleviating difficulties and high cost associated with high pump input powers.

Digonnet, Michel J. F. (Palo Alto, CA); Shaw, H. John (Palo Alto, CA); Pantell, Richard H. (Menlo Park, CA); Sadowski, Robert W. (Camp Doha, KW)

1999-01-01T23:59:59.000Z

356

Nonlinear Energy Collimation System for Linear Colliders  

E-Print Network (OSTI)

The post-linac energy collimation system of multi-TeV linear colliders is designed to fulfil an important function of protection of the Beam Delivery System (BDS) against miss-steered beams likely generated by failure modes in the main linac. For the case of the Compact Linear Collider (CLIC), the energy collimators are required to withstand the impact of a full bunch train in case of failure. This is a very challenging task, assuming the nominal CLIC beam parameters at 1.5 TeV beam energy. The increase of the transverse spot size at the collimators using nonlinear magnets is a potential solution to guarantee the survival of the collimators. In this paper we present an alternative nonlinear optics based on a skew sextupole pair for energy collimation. Performance simulation results are also presented.

Resta-Lopez, Javier

2011-01-01T23:59:59.000Z

357

Nonlinear stability of viscous roll waves  

E-Print Network (OSTI)

Extending results of Oh--Zumbrun and Johnson--Zumbrun for parabolic conservation laws, we show that spectral stability implies nonlinear stability for spatially periodic viscous roll wave solutions of the one-dimensional St. Venant equations for shallow water flow down an inclined ramp. The main new issues to be overcome are incomplete parabolicity and the nonconservative form of the equations, which leads to undifferentiated quadratic source terms that cannot be handled using the estimates of the conservative case. The first is handled by treating the equations in the more favorable Lagrangian coordinates, for which one can obtain large-amplitude nonlinear damping estimates similar to those carried out by Mascia--Zumbrun in the related shock wave case, assuming only symmetrizability of the hyperbolic part. The second is handled by the observation that, similarly as in the relaxation and detonation cases, sources occurring in nonconservative components experience greater decay comparable to that experienced b...

Johnson, Matthew; Noble, Pascal

2010-01-01T23:59:59.000Z

358

Berkeley Lab View -- March 28, 2008  

NLE Websites -- All DOE Office Websites (Extended Search)

March 28th, 2008 Search the View Archive March 28th, 2008 Search the View Archive State of the Lab: New Initiatives, Construction Daniel Chemla (1940-2008): A Remembrance of His Career The View is Going Green DOE Excellence Award to Foundry Project Team Berkeley Lab View Here Comes BELLA: The BErkeley Lab Laser Acceleration Project Berkeley Lab Science Roundup State of the Lab: New Initiatives, Construction By Lynn Yarris image Photo by Roy Kaltschmidt, CSO Free electron lasers with attosecond capabilities, a high-energy electron accelerator less than a meter in length, the arrival of NERSC-6 and the departure of GELCO-4 were some of the highlights of Berkeley Lab Director Steve Chu's State-of-the-Lab address, which he delivered at the Building 50 Auditorium during the noon hour on March 10, with simulcast to the

359

Lake View Geothermal Facility | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Lake View Geothermal Facility Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Lake View Geothermal Facility General Information Name Lake View Geothermal Facility Facility Lake View Sector Geothermal energy Location Information Location The Geysers, California Coordinates 38.823527148671°, -122.78173327446° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":38.823527148671,"lon":-122.78173327446,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

360

Incorporating video into Google Mobile Street View  

E-Print Network (OSTI)

Mobile Street View is a compelling application but suffers from significant latency problems, especially in limited bandwidth circumstances. Currently, the application uses static images to display street level information. ...

Wright, Christina (Christina E.)

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

A common-view disciplined oscillator  

SciTech Connect

This paper describes a common-view disciplined oscillator (CVDO) that locks to a reference time scale through the use of common-view global positioning system (GPS) satellite measurements. The CVDO employs a proportional-integral-derivative controller that obtains near real-time common-view GPS measurements from the internet and provides steering corrections to a local oscillator. A CVDO can be locked to any time scale that makes real-time common-view data available and can serve as a high-accuracy, self-calibrating frequency and time standard. Measurement results are presented where a CVDO is locked to UTC(NIST), the coordinated universal time scale maintained at the National Institute of Standards and Technology in Boulder, Colorado.

Lombardi, Michael A. [Time and Frequency Division, National Institute of Standards and Technology (NIST), Boulder, Colorado 80305 (United States); Dahlen, Aaron P. [Loran Support Unit, United States Coast Guard (USCG), Wildwood, New Jersey 08260 (United States)

2010-05-15T23:59:59.000Z

362

A view-sequential 3D display  

E-Print Network (OSTI)

This thesis outlines the various techniques for creating electronic 3D displays and analyzes their commercial potential. The thesis argues for the use of view-sequential techniques in the design of 3D displays based on ...

Cossairt, Oliver S. (Oliver Strider), 1978-

2003-01-01T23:59:59.000Z

363

The new option view of investment  

E-Print Network (OSTI)

This paper provides a simple introduction to the new option view of investment. We explain the shortcomings of the orthodox theory, and then outline the basic ideas behind the option framework. Several industry examples ...

Dixit, Avinash K.

1995-01-01T23:59:59.000Z

364

Wave propagation in photonic crystals and metamaterials: Surface waves, nonlinearity and chirality  

SciTech Connect

Photonic crystals and metamaterials, both composed of artificial structures, are two interesting areas in electromagnetism and optics. New phenomena in photonic crystals and metamaterials are being discovered, including some not found in natural materials. This thesis presents my research work in the two areas. Photonic crystals are periodically arranged artificial structures, mostly made from dielectric materials, with period on the same order of the wavelength of the working electromagnetic wave. The wave propagation in photonic crystals is determined by the Bragg scattering of the periodic structure. Photonic band-gaps can be present for a properly designed photonic crystal. Electromagnetic waves with frequency within the range of the band-gap are suppressed from propagating in the photonic crystal. With surface defects, a photonic crystal could support surface modes that are localized on the surface of the crystal, with mode frequencies within the band-gap. With line defects, a photonic crystal could allow the propagation of electromagnetic waves along the channels. The study of surface modes and waveguiding properties of a 2D photonic crystal will be presented in Chapter 1. Metamaterials are generally composed of artificial structures with sizes one order smaller than the wavelength and can be approximated as effective media. Effective macroscopic parameters such as electric permittivity {epsilon}, magnetic permeability {mu} are used to characterize the wave propagation in metamaterials. The fundamental structures of the metamaterials affect strongly their macroscopic properties. By designing the fundamental structures of the metamaterials, the effective parameters can be tuned and different electromagnetic properties can be achieved. One important aspect of metamaterial research is to get artificial magnetism. Metallic split-ring resonators (SRRs) and variants are widely used to build magnetic metamaterials with effective {mu} < 1 or even {mu} < 0. Varactor based nonlinear SRRs are built and modeled to study the nonlinearity in magnetic metamaterials and the results will be presented in Chapter 3. Negative refractive index n is one of the major target in the research of metamaterials. Negative n can be obtained with a metamaterial with both {epsilon} and {mu} negative. As an alternative, negative index for one of the circularly polarized waves could be achieved with metamaterials having a strong chirality ?. In this case neither {epsilon} nor {mu} negative is required. My work on chiral metamaterials will be presented in Chapter 4.

Wang, Bingnan

2009-12-03T23:59:59.000Z

365

A q-deformed nonlinear map  

E-Print Network (OSTI)

A scheme of q-deformation of nonlinear maps is introduced. As a specific example, a q-deformation procedure related to the Tsallis q-exponential function is applied to the logistic map. Compared to the canonical logistic map, the resulting family of q-logistic maps is shown to have a wider spectrum of interesting behaviours, including the co-existence of attractors -- a phenomenon rare in one dimensional maps.

Ramaswamy Jaganathan; Sudeshna Sinha

2004-08-19T23:59:59.000Z

366

Nonlinear optical and conductive polymeric material  

DOE Patents (OSTI)

A polymeric material is described which exhibits nonlinear optical properties if undoped and conductive properties if doped. The polymer is prepared by polymerizing diethynylsilane compositions, the resulting polymeric material having a weight average molecular weight between about 20,000 and about 200,000 grams per mole. The polymer is prepared and catalytically polymerized by exposure to a catalyst, such as MoCl[sub 5] or W(CO)[sub 6].

Barton, T.J.; Ijadi-Maghsooodi, S; Yi Pang.

1993-10-19T23:59:59.000Z

367

Nonlinear fan instability of electromagnetic waves  

Science Conference Proceedings (OSTI)

This paper studies the linear and nonlinear stages of the fan instability, considering electromagnetic waves of the whistler frequency range interacting resonantly with energetic electron fluxes in magnetized plasmas. The main attention is paid to determine the wave-particle interaction processes that can lead to the excitation of intense electromagnetic waves by nonequilibrium particle distributions involving suprathermal tails, and to explain under what conditions and through what mechanisms they can occur, develop, and saturate. This paper presents and discusses two main processes: (i) the linear fan instability and (ii) the nonlinear process of dynamical resonance merging, which can significantly amplify the energy carried by linearly destabilized waves after they saturate due to particle trapping. This study consists of (i) determining analytically and numerically, for parameters typical of space and laboratory plasmas, the linear growth rates of whistlers excited by suprathermal particle fluxes through the fan instability, as well as the corresponding thresholds and the physical conditions at which the instability can appear, (ii) building a theoretical self-consistent 3D model and a related numerical code for describing the nonlinear evolution of the wave-particle system, and (iii) performing numerical simulations to reveal and characterize the nonlinear amplification process at work, its conditions of development, and its consequences, notably in terms of electromagnetic wave radiation. The simulations show that when the waves have reached sufficient energy levels owing to the linear fan instability, they saturate by trapping particles and due to the complex dynamics of these particles in the electromagnetic fields, the resonant velocities' domains of the waves overlap and merge, meanwhile a strong increase of the wave energy occurs.

Krafft, C. [Laboratoire de Physique des Plasmas, Ecole Polytechnique, 91128 Palaiseau Cedex (France) and University Paris Sud, 91405 Orsay Cedex (France); Volokitin, A. [Space Research Institute (IKI), 117997, 84/32 Profsoyuznaya Str., Moscow (Russian Federation)

2010-10-15T23:59:59.000Z

368

Chaos and Control in Nonlinear Bloch System  

E-Print Network (OSTI)

The dynamics of two nonlinear Bloch systems is studied from the viewpoint of bifur- cation and a particular parameter space has been explored for the stability analysis based on stability criterion. This enables the choice of the desired unstable periodic orbit from the numerous unstable ones present within the attractor through the pro- cess of closed return pairs. A generalized active control method have been discussed for two Bloch systems arising from di erent initial conditions.

B. Rakshit; P. Saha; A. Roy. Chowdhury

2005-01-03T23:59:59.000Z

369

Nonlinear optical and conductive polymeric material  

DOE Patents (OSTI)

A polymeric material which exhibits nonlinear optical properties if undoped and conductive properties if doped. The polymer is prepared by polymerizing diethynylsilane compositions, the resulting polymeric material having a weight average molecular weight between about 20,000 and about 200,000 grams per mole. The polymer is prepared and catalytically polymerized by exposure to a catalyst, such as MoCl.sub.5 or W(CO).sub.6 /hv.

Barton, Thomas J. (Ames, IA); Ijadi-Maghsoodi, Sina (Ames, IA); Pang, Yi (Ames, IA)

1993-10-19T23:59:59.000Z

370

Nonlinear optical and conductive polymeric material  

DOE Patents (OSTI)

A polymeric material which exhibits nonlinear optical properties if undoped and conductive properties if doped. The polymer is prepared by polymerizing diethynylsilane compositions, the resulting polymeric material having a weight average molecular weight between about 20,000 and about 200,000 grams per mole. The polymer is prepared and catalytically polymerized by exposure to a catalyst, such as MoCl.sub.5 or W(CO).sub.6 /hv.

Barton, Thomas J. (Ames, IA); Ijadi-Maghsoodi, Sina (Ames, IA); Pang, Yi (Ames, IA)

1992-05-19T23:59:59.000Z

371

Prediction of Magnetic Storms by Nonlinear Models  

E-Print Network (OSTI)

The strong correlation between magnetic storms and southward interplanetary magnetic field (IMF) is well known from linear prediction filter studies using the Dst and IMF data. However, the linear filters change significantly from one storm to another and thus are limited in their predicting ability. Previous studies have indicated nonlinearity in the magnetospheric response as the ring current decay rate varies with the Dst value during storms. We present in this letter nonlinear models for the evolution of the Dst based on the OMNI database for 1964-1990. When solar wind data are available in advance, the evolution of storms can be predicted from the Dst and IMF data. Solar wind data, however, are not available most of the time or are available typically an hour or less in advance. Therefore, we have developed nonlinear predictive models based on the Dst data alone. In the absence of solar wind data, these models cannot predict the storm onset, but can predict the storm evolution, an...

J. A. Valdivia; A. S. Sharma; K. Papadopoulos

1996-01-01T23:59:59.000Z

372

Using the scalable nonlinear equations solvers package  

SciTech Connect

SNES (Scalable Nonlinear Equations Solvers) is a software package for the numerical solution of large-scale systems of nonlinear equations on both uniprocessors and parallel architectures. SNES also contains a component for the solution of unconstrained minimization problems, called SUMS (Scalable Unconstrained Minimization Solvers). Newton-like methods, which are known for their efficiency and robustness, constitute the core of the package. As part of the multilevel PETSc library, SNES incorporates many features and options from other parts of PETSc. In keeping with the spirit of the PETSc library, the nonlinear solution routines are data-structure-neutral, making them flexible and easily extensible. This users guide contains a detailed description of uniprocessor usage of SNES, with some added comments regarding multiprocessor usage. At this time the parallel version is undergoing refinement and extension, as we work toward a common interface for the uniprocessor and parallel cases. Thus, forthcoming versions of the software will contain additional features, and changes to parallel interface may result at any time. The new parallel version will employ the MPI (Message Passing Interface) standard for interprocessor communication. Since most of these details will be hidden, users will need to perform only minimal message-passing programming.

Gropp, W.D.; McInnes, L.C.; Smith, B.F.

1995-02-01T23:59:59.000Z

373

Fixed and Random Effects in Nonlinear Models  

E-Print Network (OSTI)

This paper surveys recently developed approaches to analyzing panel data with nonlinear models. We summarize a number of results on estimation of fixed and random effects models in nonlinear modeling frameworks such as discrete choice, count data, duration, censored data, sample selection, stochastic frontier and, generally, models that are nonlinear both in parameters and variables. We show that notwithstanding their methodological shortcomings, fixed effects are much more practical than heretofore reflected in the literature. For random effects models, we develop an extension of a random parameters model that has been used extensively, but only in the discrete choice literature. This model subsumes the random effects model, but is far more flexible and general, and overcomes some of the familiar shortcomings of the simple additive random effects model as usually formulated. Once again, the range of applications is extended beyond the familiar discrete choice setting. Finally, we draw together several strands of applications of a model that has taken a semiparametric approach to individual heterogeneity in panel data, the latent class model. A fairly straightforward extension is suggested that should make this more widely useable by practitioners. Many of the underlying results already appear in the literature, but, once again, the range of applications is smaller than it could be.

William Greene

2001-01-01T23:59:59.000Z

374

Energy Use in Chinese Buildings: Views of an Outsider Looking...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy Use in Chinese Buildings: Views of an Outsider Looking In Energy Use in Chinese Buildings: Views of an Outsider Looking In Energy Use in Chinese Buildings: Views of an...

375

Hollow core and other infrared waveguides for instrumentation in intense radiation environments.  

SciTech Connect

The purpose of this LDRD was to study the effect of steady-state neutron and gamma irradiation on the transmission of waveguides designed to operate well in the near- or mid-IR region of the electromagnetic spectrum. In this context, near-IR refers to the region between 1.3 {mu}m and about 2.4 {mu}m, and mid-IR between 3.0 {mu}m and 4.5 {mu}m. Such radiation environments could exist in nuclear power plants or nuclear weapons. Pulsed and steady-state radiation effects had been extensively studied on silica-based optical fibers because they have been the most readily available, most widely used in communications and sensing, and the least expensive. However, silica-based fibers do not transmit well beyond about 1.8 {mu}m and they are virtually opaque in the mid-IR. The mid-IR, as defined above, and beyond, is where vibrational spectroscopy is carried out. This type of sensing is one important application of infrared optical fibers.

Weiss, Jonathan David

2007-11-01T23:59:59.000Z

376

Fully nonlinear excitations of non-Abelian plasma  

E-Print Network (OSTI)

We investigate fully nonlinear, non-Abelian excitations of quark-antiquark plasma, using relativistic fluid theory in cold plasma approximation. There are mainly three important nonlinearities, coming from various sources such as non-Abelian interactions of Yang-Mills (YM) fields, Wong's color dynamics and plasma nonlinearity, in our model. By neglecting nonlinearities due to plasma and color dynamics we get back the earlier results of Blaizot {\\it et. al.}, Phys. Rev. Lett. 72, 3317 (1994). Similarly, by neglecting YM fields nonlinearity and plasma nonlinearity, it reduces to the model of Gupta {\\it et. al.}, Phys. Lett. B498, 223 (2005). Thus we have the most general non-Abelian mode of quark-gluon plasma (QGP). Further, our model resembles the problem of propagation of laser beam through relativistic plasma, Physica 9D, 96 (1983). in the absence of all non-Abelian interactions.

Vishnu M. Bannur

2007-06-06T23:59:59.000Z

377

Valley View Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Wind Farm Wind Farm Jump to: navigation, search Name Valley View Wind Farm Facility Valley View Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner Juhl Wind Developer Valley View Transmission Energy Purchaser Xcel Energy Location Outside Chandler MN Coordinates 43.905808°, -96.020508° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.905808,"lon":-96.020508,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

378

Business Apps List View | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Apps List View Apps List View BusinessUSA Data/Tools Apps Challenges Let's Talk BusinessUSA You are here Data.gov » Communities » BusinessUSA List View Showing 1 - 12 of 12 results. Resources sort ascending Type Last Updated On Traveling Entrepreneur Find green government opportunities for small businesses. The app based on your current location retrieves all the government programs and then allows you to share your favorite program on Facebook. Mobile 02/01/2012 Small Business Toolkit Small Business Toolbox provides a way to easily keep up-to-date on government programs, grants, awards, solicitations, and small business programs. Find the closest SBA district office, easily gathering license and permit information. Mobile 01/31/2012 SBIR.gov Awards Search This app allows users to search the SBIR awards database by agency, keyword, and year.

379

states apps list view | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

states apps list view states apps list view States Data Apps Challenges Policies States You are here Data.gov » Communities » States List View Showing 1 - 5 of 5 results. Resources sort ascending Type Last Updated On TrashBackwards Trash Backwards will connect you with current recycling information, Do It Yourself reuse and upcycle tutorials that are easy to follow, reliable articles and infographics, upcycled products and durable alternatives to common single-use items, and links to non-profits and other groups who will benefit greatly from the stuff you're done with. Currently includes Massachusetts and Washington. Apps 02/27/2013 MoDOT's Traveler Information Map App With the launch of MoDOT's new Traveler Information Map mobile app, Missouri travelers can get the latest information on road conditions, work zones, flooding and incidents on their iPhones and Androids. Mobile 05/22/2013

380

Nonlinear lower-hybrid oscillations in cold plasma  

SciTech Connect

In a fluid description nonlinear lower-hybrid oscillation have been studied in a cold quasineutral magnetized plasma using Lagrangian variables. An exact analytical solution with nontrivial space and time dependence is obtained. The solution demonstrates that under well defined initial and boundary conditions the amplitude of the oscillations increases due to nonlinearity and then comes back to its initial condition again. These solutions indicate a class of nonlinear transient structures in magnetized plasma.

Maity, Chandan; Chakrabarti, Nikhil [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700 064 (India); Sengupta, Sudip [Institute of Plasma Research, Bhat, Gandhinagar 382428 (India)

2010-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Nonlinear self-sustainment of magnetic islands  

SciTech Connect

A mechanism is proposed for a nonlinear self-sustainment of magnetic islands which relies on the presence of a chaotic region. Particles diffusing in the stochastic magnetic field produce a local increase of current which in turn sustains the original perturbation if the equilibrium profile is concave. It is shown that the new equilibrium is stable. In a tokamak the mechanism is operative in the region outside the q=2 surface, in agreement with the observation of strong electron confinement degradation in this region. 14 refs., 3 figs.

White, R.B.; Romanelli, F.

1988-01-01T23:59:59.000Z

382

Nonlinear Dynamics of Active Brownian Particles  

E-Print Network (OSTI)

Abstract. We consider finite systems of interacting Brownian particles including active friction in the framework of nonlinear dynamics and statistical/stochastic theory. First we study the statistical properties for 1?d systems of masses connected by Toda springs which are imbedded into a heat bath. Including negative friction we find N + 1 attractors of motion including an attractor describing dissipative solitons. Noise leads to transition between the deterministic attractors. In the case of two-dynamical motion of interacting particles angular momenta are generated and left/right rotations of pairs and swarms are found. 1

Werner Ebeling

2002-01-01T23:59:59.000Z

383

Fundamentals of preparative and nonlinear chromatography  

Science Conference Proceedings (OSTI)

The second edition of Fundamentals of Preparative and Nonlinear Chromatography is devoted to the fundamentals of a new process of purification or extraction of chemicals or proteins widely used in the pharmaceutical industry and in preparative chromatography. This process permits the preparation of extremely pure compounds satisfying the requests of the US Food and Drug Administration. The book describes the fundamentals of thermodynamics, mass transfer kinetics, and flow through porous media that are relevant to chromatography. It presents the models used in chromatography and their solutions, discusses the applications made, describes the different processes used, their numerous applications, and the methods of optimization of the experimental conditions of this process.

Guiochon, Georges A [ORNL; Felinger, Attila [ORNL; Katti, Anita [University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL); Shirazi, Dean G [unknown

2006-02-01T23:59:59.000Z

384

Nonlinear Synchronization Analysis of Spatiotemporal Heart Data  

Science Conference Proceedings (OSTI)

A high?speed video camera and voltage?sensitive dyes were used to acquire high resolution (80×80 pixels) and high?speed (500 ?s/frame) optical signals of ventricular fibrillation in a Langendorff?perfused porcine heart. The resulting spatiotemporal dynamics were recorded before and after the application of a defibrillation shock in order to study the mechanism of defibrillation failure. We calculate nonlinear synchronization index measures to qualify the evolution of different types of activity on the heart surface (focal

Jennifer D. Simonotto; Michael D. Furman; Mark L. Spano; William L. Ditto; Gang Liu; Katherine M. Kavanagh

2003-01-01T23:59:59.000Z

385

SEANO: Structure-Exploiting Algorithms for Nonlinear Optimization...  

NLE Websites -- All DOE Office Websites (Extended Search)

Algorithms for Nonlinear Optimization Advances in high-performance computing have led to a new generation of complex optimization problems that span the breadth of...

386

A Method of Solving Certain Nonlinear Diophantine Equations  

E-Print Network (OSTI)

In this paper we propose a method of solving a Nonlinear Diophantine Equation by converting it into a System of Diophantine Linear Equations.

Florentin Smarandache

2009-10-12T23:59:59.000Z

387

Nonlinear laser energy depletion in laser-plasma accelerators  

E-Print Network (OSTI)

Nonlinear laser energydepletion in laser-plasma accelerators ? B. A. Shadwick,of intense, short-pulse lasers via excitation of plasma

Shadwick, B.A.

2009-01-01T23:59:59.000Z

388

Energetical factors in power systems with nonlinear loads  

Science Conference Proceedings (OSTI)

Based on the volt-ampere charac- teristic of the nonlinear load, an equivalent circuit, containing linear elements, can be determined. In this way, load-flow and.

389

Nonlinear Landau damping of transverse electromagnetic waves in dusty plasmas  

SciTech Connect

High-frequency transverse electromagnetic waves in a collisionless isotropic dusty plasma damp via nonlinear Landau damping. Taking into account the latter we have obtained a generalized set of Zakharov equations with local and nonlocal terms. Then from this coupled set of Zakharov equations a kinetic nonlinear Schroedinger equation with local and nonlocal nonlinearities is derived for special cases. It is shown that the modulation of the amplitude of the electromagnetic waves leads to the modulation instability through the nonlinear Landau damping term. The maximum growth rate is obtained for the special case when the group velocity of electromagnetic waves is close to the dust acoustic velocity.

Tsintsadze, N. L. [E. Andronikashvili Institute of Physics, Tbilisi 0171 (Georgia); Department of Physics, Government College University, Lahore 54000 (Pakistan); Salam Chair in Physics, Government College University, Lahore 54000 (Pakistan); Chaudhary, Rozina [Department of Physics, Government College University, Lahore 54000 (Pakistan); Salam Chair in Physics, Government College University, Lahore 54000 (Pakistan); Shah, H. A. [Department of Physics, Government College University, Lahore 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, Government College University, Lahore 54000 (Pakistan)

2009-04-15T23:59:59.000Z

390

Nonlinearity Measurements of High-Power Laser Detectors at ...  

Science Conference Proceedings (OSTI)

... We have developed a system [3] for measuring the nonlinearity of the detectors over the 1 W to multi- kilowatt power range. ...

2011-10-03T23:59:59.000Z

391

Solution of Nonlinear Equations via Optimization [rev. 4  

E-Print Network (OSTI)

bound technique that can find all the solutions of nonlinear equation systems; Van Hentenryck, McAllester &. Kapur [28] who present a branch-and-prune ...

392

Di erentiable Exact Penalty Functions for Nonlinear Second-Order ...  

E-Print Network (OSTI)

Masao Fukushima‡. September 6, 2012. Abstract. We propose a method to solve nonlinear second-order cone programs (SOCPs), based on a continuously ...

393

Asymptotic solutions of the nonlinear three-wave system  

SciTech Connect

An analytical method is developed for the investigation of the nonlinear state resulting from instability saturation by resonant mode coupling. .ID

Bussac, M.N.

1982-12-27T23:59:59.000Z

394

A Mixed Integer Nonlinear Programming Framework for Fixed Path ...  

E-Print Network (OSTI)

paths of the robots are represented by piecewise cubic spline curves. ...... programming, linear and nonlinear systems theory, statistics, and machine learning.

395

a comparative study of large-scale nonlinear optimization  

E-Print Network (OSTI)

Dec 5, 2001 ... Technical report, Argonne National Laboratory, January 2001. [6] R. Fletcher and S. Leyffer. Nonlinear programming without a penalty func-.

396

A Nonlinear Model Based (NMPC) Control Strategy for the ...  

Science Conference Proceedings (OSTI)

New advanced process control systems imply utilizing state of the art process control systems as e.g. Nonlinear Model Predictive Control (NMPC). Although the

397

The dispersion relation and excitation of transverse magnetic mode electromagnetic waves in rippled-wall waveguide with a plasma rod and an annular dielectric  

Science Conference Proceedings (OSTI)

By using the linear field theory, the dispersion relation of electromagnetic waves in a rippled-wall waveguide with a plasma rod and an annular dielectric is obtained. In addition, by injecting a finite thick annular intense relativistic electron beam in this waveguide, the excitation of these waves is investigated. Furthermore, the effects of the radius of the plasma rod, the radius of the dielectric, the corrugation amplitude, and period on the frequency spectrum are investigated. Besides, the time growth rate of excitation of these waves by an annular relativistic electron beam is studied. Finally, to demonstrate the advantages of this rippled-wall waveguide, the dispersion relation and the growth rate of three simplified cases are investigated.

Nejati, M. [Physics Department, Shahid Beheshti University, G. C. Evin, Tehran (Iran, Islamic Republic of); Shokri, B. [Physics Department and Laser-Plasma Research Institute, Shahid Beheshti University, G. C. Evin, Tehran (Iran, Islamic Republic of)

2012-01-15T23:59:59.000Z

398

Nonlinear spin relaxation in strongly nonequilibrium magnets  

E-Print Network (OSTI)

A general theory is developed for describing the nonlinear relaxation of spin systems from a strongly nonequilibrium initial state, when, in addition, the sample is coupled to a resonator. Such processes are characterized by nonlinear stochastic differential equations. This makes these strongly nonequilibrium processes principally different from the spin relaxation close to an equilibrium state, which is represented by linear differential equations. The consideration is based on a realistic microscopic Hamiltonian including the Zeeman terms, dipole interactions, exchange interactions, and a single-site anisotropy. The influence of cross correlations between several spin species is investigated. The critically important function of coupling between the spin system and a resonant electric circuit is emphasized. The role of all main relaxation rates is analyzed. The phenomenon of self-organization of transition coherence in spin motion, from the quantum chaotic stage of incoherent fluctuations, is thoroughly described. Local spin fluctuations are found to be the triggering cause for starting the spin relaxation from an incoherent nonequilibrium state. The basic regimes of collective coherent spin relaxation are studied.

V. I. Yukalov

2005-06-20T23:59:59.000Z

399

Nonlinear complexity of binary sequences and connections with lempel-ziv compression  

Science Conference Proceedings (OSTI)

The nonlinear complexity of binary sequences is studied in this paper. A new recursive algorithm is presented, which produces the minimal nonlinear feedback shift register of a given sequence. Further, a connection between the nonlinear complexity and ... Keywords: Lempel-Ziv compression, cryptography, nonlinear complexity, nonlinear feedback shift registers, sequences

Konstantinos Limniotis; Nicholas Kolokotronis; Nicholas Kalouptsidis

2006-09-01T23:59:59.000Z

400

Sharing the viewing experience through second screens  

Science Conference Proceedings (OSTI)

Despite the ever expanding forms of digital entertainment and the emergence of consumer recording facilities, allowing viewers to time shift their TV viewing habits, there are still certain TV shows and events that create an audience desire to be part ... Keywords: interactive, mobile, narrative, performance, second screen, shared experience, television, twitter

Mark Lochrie; Paul Coulton

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Book review A Clear View of  

E-Print Network (OSTI)

Magazine R1 Book review A Clear View of the Cell Cycle James E. Ferrell, Jr. The Cell Cycle." It was a timely book, coming right on the heels of the discovery that cyclin-dependent kinases (Cdks) drive cell book. Enter "The Cell Cycle: Principles of Control", by David Morgan, just published by New Science

402

Terahertz quantum cascade lasers with thin resonant-phonon depopulation active regions and surface-plasmon waveguides  

E-Print Network (OSTI)

We report three-well, resonant-phonon depopulation terahertz quantum cascade lasers with semi-insulating surface-plasmon waveguides and reduced active region (AR) thicknesses. Devices with thicknesses of 10, 7.5, 6, and 5 {\\mu}m are compared in terms of threshold current density, maximum operating temperature, output power and AR temperature. Thinner ARs are technologically less demanding for epitaxial growth and result in reduced electrical heating of devices. However, it is found that 7.5-{\\mu}m-thick devices give the lowest electrical power densities at threshold, as they represent the optimal trade-off between low electrical resistance and low threshold gain.

Salih, M; Valavanis, A; Khanna, S P; Li, L H; Cunningham, J E; Davies, A G; Linfield, E H

2013-01-01T23:59:59.000Z

403

Few-photon transport in a waveguide coupled to a pair of colocated two-level atoms  

SciTech Connect

We calculate the one- and two-photon scattering matrices of a pair of collocated nonidentical two-level atoms coupled to a waveguide. We show that by proper choice of a two-photon input, the background fluorescence by the atoms may be completely quenched, as a result of quantum interference, and that when the atoms' detuning is smaller than their linewidths, extremely narrow fluorescence features emerge. Furthermore, the system emits a two-photon bound state which can display spatial oscillations or quantum beats, and can be tuned from bunched to antibunched statistics as the total photon energy is varied.

Rephaeli, Eden [Department of Applied Physics, Stanford University, Stanford, California 94305 (United States); Kocabas, Suekrue Ekin; Fan, Shanhui [Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States)

2011-12-15T23:59:59.000Z

404

Terahertz quantum cascade lasers with thin resonant-phonon depopulation active regions and surface-plasmon waveguides  

E-Print Network (OSTI)

We report three-well, resonant-phonon depopulation terahertz quantum cascade lasers with semi-insulating surface-plasmon waveguides and reduced active region (AR) thicknesses. Devices with thicknesses of 10, 7.5, 6, and 5 {\\mu}m are compared in terms of threshold current density, maximum operating temperature, output power and AR temperature. Thinner ARs are technologically less demanding for epitaxial growth and result in reduced electrical heating of devices. However, it is found that 7.5-{\\mu}m-thick devices give the lowest electrical power densities at threshold, as they represent the optimal trade-off between low electrical resistance and low threshold gain.

M. Salih; P. Dean; A. Valavanis; S. P. Khanna; L. H. Li; J. E. Cunningham; A. G. Davies; E. H. Linfield

2013-03-13T23:59:59.000Z

405

Excitation of terahertz radiation by an electron beam in a dielectric lined waveguide with rippled dielectric surface  

SciTech Connect

A relativistic electron beam propagating through a dielectric lined waveguide, with ripple on the dielectric surface, excites a free electron laser type instability where ripple acts as a wiggler. The spatial modulation of permittivity in the ripple region couples a terahertz radiation mode to a driven mode of lower phase velocity, where the beam is in Cerenkov resonance with the slow mode. Both the modes grow at the expanse of beam energy. The terahertz frequency increases as the beam velocity increases. The growth rate of the instability goes as one third power of beam density.

Tripathi, Deepak; Uma, R. [Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016 (India); Tripathi, V. K. [Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)

2012-09-15T23:59:59.000Z

406

ANALYSIS OF HIGH FIELD NON-LINEAR LOSSES ON SRF SURFACES DUE TO SPECIFIC TOPOGRAPHIC ROUGHNESS  

Science Conference Proceedings (OSTI)

The high-field performance of SRF cavities will eventually be limited by the realization of fundamental material limits, whether it is Hc1 or Hsh, or some derivative thereof, at which the superconductivity is lost. Before reaching this fundamental field limit at the macro level, it must be encountered at localized, perhaps microscopic, sites of field enhancement due to local topography. If such sites are small enough, they may produce thermally stabilized normal-conducting regions which contribute non-linear losses when viewed from the macro resonant field perspective, and thus produce degradation in Q0. We have undertaken a calculation of local surface magnetic field enhancement from specific fine topographic structure by conformal mapping method and numerically. A solution of the resulting normal conducting volume has been derived and the corresponding RF Ohmic loss simulated.

Chen Xu,Charles Reece,Michael Kelley

2012-07-01T23:59:59.000Z

407

Transient evolution of a photon gas in the nonlinear QED vacuum  

SciTech Connect

Thermally induced vacuum polarization stemming from QED radiative corrections to the electromagnetic field equations is studied. The physical behavior of thermal radiation, in the nonlinear QED vacuum first described by Heisenberg and Euler, is a problem of some theoretical importance in view of its relation to the cosmic microwave background (CMB), early universe evolution, and Hawking-Unruh radiation. The questions of evolution toward equilibrium, stability, and invariance of thermal radiation under such conditions are of great interest. Our analysis presents novel aspects associated with photon-photon scattering in a photon gas in the framework of quantum kinetic theory. Within the context of the Euler-Heisenberg theory, we show that a homogeneous, isotropic photon gas with arbitrary spectral distribution function evolves toward an equilibrium state with a Bose-Einstein distribution. The transient evolution toward equilibrium of a gas of photons undergoing photon-photon scattering is studied in detail via the Boltzmann transport equation.

Wu, S Q; Hartemann, F V

2011-10-04T23:59:59.000Z

408

Nonlinear dynamical triggering of slow slip  

SciTech Connect

Among the most fascinating, recent discoveries in seismology have been the phenomena of triggered slip, including triggered earthquakes and triggered-tremor, as well as triggered slow, silent-slip during which no seismic energy is radiated. Because fault nucleation depths cannot be probed directly, the physical regimes in which these phenomena occur are poorly understood. Thus determining physical properties that control diverse types of triggered fault sliding and what frictional constitutive laws govern triggered faulting variability is challenging. We are characterizing the physical controls of triggered faulting with the goal of developing constitutive relations by conducting laboratory and numerical modeling experiments in sheared granular media at varying load conditions. In order to simulate granular fault zone gouge in the laboratory, glass beads are sheared in a double-direct configuration under constant normal stress, while subject to transient perturbation by acoustic waves. We find that triggered, slow, silent-slip occurs at very small confining loads ({approx}1-3 MPa) that are smaller than those where dynamic earthquake triggering takes place (4-7 MPa), and that triggered slow-slip is associated with bursts of LFE-like acoustic emission. Experimental evidence suggests that the nonlinear dynamical response of the gouge material induced by dynamic waves may be responsible for the triggered slip behavior: the slip-duration, stress-drop and along-strike slip displacement are proportional to the triggering wave amplitude. Further, we observe a shear-modulus decrease corresponding to dynamic-wave triggering relative to the shear modulus of stick-slips. Modulus decrease in response to dynamical wave amplitudes of roughly a microstrain and above is a hallmark of elastic nonlinear behavior. We believe that the dynamical waves increase the material non-affine elastic deformation during shearing, simultaneously leading to instability and slow-slip. The inferred triggered slow-slip on the San Andreas Fault at Parkfield, CA., due to December, 2003 Mw6.5 San Simeon Earthquake (Breguier et al., Science 321, p.1478, 2008) shows very similar characteristics to what we observe in the laboratory, suggesting an extremely low in situ effective stress or a weak fault and a nonlinear-dynamical triggering mechanism.

Johnson, Paul A [Los Alamos National Laboratory; Knuth, Matthew W [WISCONSIN; Kaproth, Bryan M [PENN STATE; Carpenter, Brett [PENN STATE; Guyer, Robert A [Los Alamos National Laboratory; Le Bas, Pierre - Yves [Los Alamos National Laboratory; Daub, Eric G [Los Alamos National Laboratory; Marone, Chris [PENN STATE

2010-12-10T23:59:59.000Z

409

ROSSLER NONLINEAR DYNAMICAL MACHINE FOR CRYPTOGRAPHY APPLICATIONS Sunil Pandey  

E-Print Network (OSTI)

of chemical kinetics. The Rossler system is described by a system of 3 coupled nonlinear ordinary differentialROSSLER NONLINEAR DYNAMICAL MACHINE FOR CRYPTOGRAPHY APPLICATIONS Sunil Pandey * M.Tech. (Info Sec Author e-mail: algosunil@yahoo.co.in ABSTRACT In many of the cryptography applications like password

International Association for Cryptologic Research (IACR)

410

P and PI controllers for a nonlinear hydraulic network  

E-Print Network (OSTI)

constraints) arising in industrial applications. Current case study: Grundfos district heating system #12;P" district heating system #12;P and PI controllers for a nonlinear hydraulic network Sept. 20, 2007 Page 4 Results #12;P and PI controllers for a nonlinear hydraulic network Sept. 20, 2007 Page 5 District Heating

De Persis, Claudio

411

A unified approach to nonlinear buckling optimization of composite structures  

Science Conference Proceedings (OSTI)

A unified approach to nonlinear buckling fiber angle optimization of laminated composite shell structures is presented. The method includes loss of stability due to bifurcation and limiting behaviour. The optimization formulation is formulated as a mathematical ... Keywords: Bifurcation buckling, Composite laminate optimization, Composite structures, Design sensitivity analysis, Limit point buckling, Nonlinear buckling

Esben Lindgaard; Erik Lund

2011-02-01T23:59:59.000Z

412

Nonlinear Control of a Wind Turbine Sven Creutz Thomsen  

E-Print Network (OSTI)

. This quantity is denoted the point wind. However, the turbine is not subject to a single wind speed, but ratherNonlinear Control of a Wind Turbine Sven Creutz Thomsen Kongens Lyngby 2006 #12;Technical describes analysis of various nonlinear control methods for controlling a wind turbine. High speed wind

413

Nonlinear Control of a Wind Turbine Sven Creutz Thomsen  

E-Print Network (OSTI)

Nonlinear Control of a Wind Turbine Sven Creutz Thomsen Kongens Lyngby 2006 #12; Technical describes analysis of various nonlinear control methods for controlling a wind turbine. High speed wind Modeling and analysis 5 2 Model descriptions 7 2.1 Variable speed wind turbine

414

Non-linear image representation based on IDP with NN  

Science Conference Proceedings (OSTI)

In this paper is offered a method for non-linear still image representation based on pyramidal decomposition with a neural network. This approach is developed by analogy with the hypothesis for the way humans do image recognition using consecutive approximations ... Keywords: neural networks, non-linear image representation, pyramidal decomposition

Roumen Kountchev; Stuart Rubin; Mariofanna Milanova; Vladimir Todorov; Roumiana Kountcheva

2009-09-01T23:59:59.000Z

415

Nonlinear adaptive control for bioreactors with unknown kinetics  

Science Conference Proceedings (OSTI)

We consider a control problem for a single bioreaction occurring in a continuous and well-mixed bioreactor, assuming that the bioreaction's kinetics is not represented by a validated model. We develop a nonlinear controller and prove the global asymptotic ... Keywords: Continuous bioprocesses, Nonlinear adaptive control, Unknown kinetics, Wastewater treatment

Ludovic Mailleret; Olivier Bernard; Jean-Philippe Steyer

2004-08-01T23:59:59.000Z

416

Nonlinear analysis of a reaction-diffusion system: Amplitude equations  

Science Conference Proceedings (OSTI)

A reaction-diffusion system with a nonlinear diffusion term is considered. Based on nonlinear analysis, the amplitude equations are obtained in the cases of the Hopf and Turing instabilities in the system. Turing pattern-forming regions in the parameter space are determined for supercritical and subcritical instabilities in a two-component reaction-diffusion system.

Zemskov, E. P., E-mail: zemskov@ccas.ru [Russian Academy of Sciences, Dorodnicyn Computing Center (Russian Federation)

2012-10-15T23:59:59.000Z

417

Multistability in nonlinear left-handed transmission lines  

E-Print Network (OSTI)

Employing a nonlinear left-handed transmission line as a model system, we demonstrate experimentally the multi-stability phenomena predicted theoretically for microstructured left-handed metamaterials with a nonlinear response. We show that the bistability is associated with the period doubling which at higher power may result in chaotic dynamics of the transmission line.

Powell, David A; Kivshar, Yuri S

2008-01-01T23:59:59.000Z

418

Finite Element formulation for nonlinear analysis of masonry walls  

Science Conference Proceedings (OSTI)

The work builds upon previous developments made by the authors in the context of the nonlinear, in-plane analysis of masonry walls. The structural behavior is characterized by phenomena, such as strain localization, damage, and friction, which need to ... Keywords: In-plane nonlinear masonry mechanics, Mohr-Coulomb frictional behavior, Non-associated plasticity

S. Brasile; R. Casciaro; G. Formica

2010-02-01T23:59:59.000Z

419

Computationally efficient nonlinear predictive control based on neural Wiener models  

Science Conference Proceedings (OSTI)

This paper describes a computationally efficient nonlinear model predictive control (MPC) algorithm based on neural Wiener models and its application. The model contains a linear dynamic part in series with a steady-state nonlinear part which is realised ... Keywords: Linearisation, Model predictive control, Neural networks, Optimisation, Process control, Wiener systems

Maciej ?awry?czuk

2010-12-01T23:59:59.000Z

420

Modulational instability and solitons in nonlocal media with competing nonlinearities  

Science Conference Proceedings (OSTI)

We investigate analytically and numerically propagation and spatial localization of light in nonlocal media with competing nonlinearities. In particular, we discuss conditions for the modulational instability of plane waves and formation of spatial solitons. We show that the competing focusing and defocusing nonlinearities enable coexistence of dark or bright spatial solitons in the same medium by varying the intensity of the beam.

Esbensen, B. K.; Bache, M.; Bang, O. [DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby (Denmark); Wlotzka, A. [Department of Physics, Institut fuer Theoretische Festkoerperphysik, University of Karlsruhe, D-76128 Karlsruhe (Germany); Krolikowski, W. [Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia)

2011-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Cerenkov third-harmonic generation in ,,2... nonlinear photonic crystal  

E-Print Network (OSTI)

Cerenkov third-harmonic generation in ,,2... nonlinear photonic crystal Yan Sheng,1,a Wenjie Wang,1 of Cerenkov emission of a third-harmonic frequency in a two-dimensional nonlinear photonic crystal, where coherent light called Cerenkov radiation.1 In this process, the mol- ecules of the medium are polarized

Arie, Ady

422

Some Thoughts on Stability in Nonlinear Periodic Focusing Systems  

DOE R&D Accomplishments (OSTI)

A brief discussion is given of the long-term stability of particle motions through periodic focusing structures containing lumped nonlinear elements. A method is presented whereby one can specify the nonlinear elements in such a way as to generate a variety of structures in which the motion has long-term stability.

McMillan, E. M.

1967-09-05T23:59:59.000Z

423

Symbolic analysis of analog circuits with hard nonlinearity  

Science Conference Proceedings (OSTI)

A new methodology is presented to solve a strongly nonlinear circuit, characterized by Piece-Wise Linear (PWL) functions, symbolically and explicitly in terms of its circuit parameters and is amenable to computer implementation. The method is based on ... Keywords: PWL, circuit nonlinearity, symbolic analysis

Alicia Manthe; Zhao Li; C.-J. Richard Shi

2003-06-01T23:59:59.000Z

424

The view-selection problem has an exponential-time lower bound for conjunctive queries and views  

Science Conference Proceedings (OSTI)

The view-selection problem is to design and materialize a set of views over a database schema, such that the choice of views minimizes the cost of evaluating the selected workload of queries, and the combined size of the materialized views does not exceed ...

Rada Chirkova

2002-06-01T23:59:59.000Z

425

Linear And Nonlinear Arabesques: A Study Of Closed Chains Of Negative 2-Element Circuits  

E-Print Network (OSTI)

In this paper we consider a family of dynamical systems that we call "arabesques", defined as closed chains of 2-element negative circuits. An $n$-dimensional arabesque system has $n$ 2-element circuits, but in addition, it displays by construction, two $n$-element circuits which are both positive vs one positive and one negative, depending on the parity (even or odd) of the dimension $n$. In view of the absence of diagonal terms in their Jacobian matrices, all these dynamical systems are conservative and consequently, they can not possess any attractor. First, we analyze a linear variant of them which we call "arabesque 0" or for short "A0". For increasing dimensions, the trajectories are increasingly complex open tori. Next, we inserted a single cubic nonlinearity that does not affect the signs of its circuits (that we call "arabesque 1" or for short "A1"). These systems have three steady states, whatever the dimension is, in agreement with the order of the nonlinearity. All three are unstable, as there can not be any attractor in their state-space. The 3D variant (that we call for short "A1\\_3D") has been analyzed in some detail and found to display a complex mixed set of quasi-periodic and chaotic trajectories. Inserting $n$ cubic nonlinearities (one per equation) in the same way as above, we generate systems "A2\\_$n$D". A2\\_3D behaves essentially as A1\\_3D, in agreement with the fact that the signs of the circuits remain identical. A2\\_4D, as well as other arabesque systems with even dimension, has two positive $n$-circuits and nine steady states. Finally, we investigate and compare the complex dynamics of this family of systems in terms of their symmetries.

Chris Antonopoulos; Vasileios Basios; Jacques Demongeot; Pasquale Nardone; Rene Thomas

2013-02-05T23:59:59.000Z

426

Factor graphs and MCMC approaches to iterative equalization of nonlinear dispersive channels  

E-Print Network (OSTI)

In this work, equalization for nonlinear dispersive channels is considered. Nonlinear communication channels can lead to significant degradations when nonlinearities are not taken into account at either the receiver or the ...

Kashif, Faisal M. (Faisal Mahmood)

2006-01-01T23:59:59.000Z

427

Soliton stripes in two-dimensional nonlinear photonic lattices  

E-Print Network (OSTI)

We study experimentally the interaction of a soliton with a nonlinear lattice. We observe the formation of a novel type of composite soliton created by strong coupling of mutually incoherent periodic and localized beam components. By imposing an initial transverse momentum on the soliton stripe, we observe the effect of lattice compression and deformation. © 2004 Optical Society of America OCIS codes: 190.0190, 190.4420. The study of nonlinear light propagation in periodic photonic structures recently attracted strong interest because it presents the unique possibility of observing an interplay between the effects of nonlinearity and periodicity. In particular, a periodic modulation of the refractive index modifies the linear spectrum and wave diffraction and consequently strongly affects the nonlinear propagation and localization of light. 1 Recently, many nonlinear effects, including the formation of lattice solitons, were demonstrated experimentally

Dragomir Neshev; Yuri S. Kivshar; Hector Martin; Zhigang Chen

2003-01-01T23:59:59.000Z

428

Nonlinear thermodynamic quantum master equation: Properties and examples  

Science Conference Proceedings (OSTI)

The quantum master equation obtained from two different thermodynamic arguments is seriously nonlinear. We argue that, for quantum systems, nonlinearity occurs naturally in the step from reversible to irreversible equations and we analyze the nature and consequences of the nonlinear contribution. The thermodynamic nonlinearity naturally leads to canonical equilibrium solutions and extends the range of validity to lower temperatures. We discuss the Markovian character of the thermodynamic quantum master equation and introduce a solution strategy based on coupled evolution equations for the eigenstates and eigenvalues of the density matrix. The general ideas are illustrated for the two-level system and for the damped harmonic oscillator. Several conceptual implications of the nonlinearity of the thermodynamic quantum master equation are pointed out, including the absence of a Heisenberg picture and the resulting difficulties with defining multitime correlations.

Oettinger, Hans Christian [ETH Zuerich, Department of Materials, Polymer Physics, HCI H 543, CH-8093 Zuerich (Switzerland)

2010-11-15T23:59:59.000Z

429

Application of nonlinear wave modulation spectroscopy to discern material damage  

SciTech Connect

Materials containing structural damage have a far greater nonlinear elastic response than materials with no structural damage. This is the basis for nonlinear wave diagnostics of damage, methods which are remarkably sensitive to the detection and progression of damage in materials. Here the authors describe one nonlinear method, the application of harmonics and sum and difference frequency to discern damage in materials. The method is termed Nonlinear Wave Modulation Spectroscopy (NWMS). It consists of exciting a sample with continuous waves of two separate frequencies simultaneously, and inspecting the harmonics of the two waves, and their sum and difference frequencies (sidebands). Undamaged materials are essentially linear in their response to the two waves, while the same material, when damaged, becomes highly nonlinear, manifested by harmonics and sideband generation. The authors illustrate the method by experiments on uncracked and cracked plexiglass and sandstone samples, and by applying it to intact and damaged engine components.

Johnson, P.A. [Los Alamos National Lab., NM (United States); Sutin, A. [Stevens Inst. of Tech., Hoboken, NJ (United States); Abeele, K.E.A. van den [Catholic Univ. Leuven (Belgium). Dept. of Building Physics

1999-04-01T23:59:59.000Z

430

744 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 40, NO. 3, MARCH 2005 Nonlinear Transmission Lines  

E-Print Network (OSTI)

of the electric field transmission characteristic corresponding to the single-row waveguiding defect is linear-calculated and measured results for the insertion loss of the 10-cm-long FR4 double-row defect shown in Fig. 3. A standard) computational studies scaled to a 10 GHz center frequency of single-row and double-row waveguiding defects

Hajimiri, Ali

431

Inflationary cosmology with nonlinear dispersion relations  

E-Print Network (OSTI)

We present a technique, {\\em the uniform asymptotic approximation}, to construct accurate analytical solutions of the linear perturbations of inflation after quantum effects of the early universe are taken into account, for which the dispersion relations generically become nonlinear. We construct explicitly the error bounds associated with the approximations and then study them in detail. With the understanding of the errors and the proper choice of the Liouville transformations of the differential equations of the perturbations, we show that the analytical solutions describe the exact evolution of the linear perturbations extremely well even only in the first-order approximations. As an application of the approximate analytical solutions, we calculate the power spectra and indices of scalar and tensor perturbations in the slow-roll inflation, and find that the amplitudes of the power spectra get modified due to the quantum effects, while the power spectrum indices remain the same as in the linear case.

Tao Zhu; Anzhong Wang; Gerald Cleaver; Klaus Kirsten; Qin Sheng

2013-08-26T23:59:59.000Z

432

Nonlinear transmission line based electron beam driver  

Science Conference Proceedings (OSTI)

Gated field emission cathodes can provide short electron pulses without the requirement of laser systems or cathode heating required by photoemission or thermionic cathodes. The large electric field requirement for field emission to take place can be achieved by using a high aspect ratio cathode with a large field enhancement factor which reduces the voltage requirement for emission. In this paper, a cathode gate driver based on the output pulse train from a nonlinear transmission line is experimentally demonstrated. The application of the pulse train to a tufted carbon fiber field emission cathode generates short electron pulses. The pulses are approximately 2 ns in duration with emission currents of several mA, and the train contains up to 6 pulses at a frequency of 100 MHz. Particle-in-cell simulation is used to predict the characteristic of the current pulse train generated from a single carbon fiber field emission cathode using the same technique.

French, David M.; Hoff, Brad W.; Tang Wilkin; Heidger, Susan; Shiffler, Don [Directed Energy Directorate, Air Force Research Laboratory, Kirtland AFB, New Mexico 87117 (United States); Allen-Flowers, Jordan [Program in Applied Mathematics, University of Arizona, Tucson, Arizona 85721 (United States)

2012-12-15T23:59:59.000Z

433

Dissipative structures in a nonlinear dynamo  

E-Print Network (OSTI)

This paper considers magnetic field generation by a fluid flow in a system referred to as the Archontis dynamo: a steady nonlinear magnetohydrodynamic (MHD) state is driven by a prescribed body force. The field and flow become almost equal and dissipation is concentrated in cigar-like structures centred on straight-line separatrices. Numerical scaling laws for energy and dissipation are given that extend previous calculations to smaller diffusivities. The symmetries of the dynamo are set out, together with their implications for the structure of field and flow along the separatrices. The scaling of the cigar-like dissipative regions, as the square root of the diffusivities, is explained by approximations near the separatrices. Rigorous results on the existence and smoothness of solutions to the steady, forced MHD equations are given.

Andrew D. Gilbert; Yannick Ponty; Vladislav Zheligovsky

2010-05-28T23:59:59.000Z

434

Nonlinear whistler wave scattering in space plasmas  

Science Conference Proceedings (OSTI)

In this paper the evolution of nonlinear scattering of whistler mode waves by kinetic Alfven waves (KAW) in time and two spatial dimensions is studied analytically. The authors suggest this nonlinear process as a mechanism of kinetic Alfven wave generation in space plasmas. This mechanism can explain the dependence of Alfven wave generation on whistler waves observed in magnetospheric and ionospheric plasmas. The observational data show a dependence for the generation of long periodic pulsations Pc5 on whistler wave excitation in the auroral and subauroral zone of the magnetosphere. This dependence was first observed by Ondoh T.I. For 79 cases of VLF wave excitation registered by Ondoh at College Observatory (L=64.6 N), 52 of them were followed by Pc5 geomagnetic pulsation generation. Similar results were obtained at the Loparskaia Observatory (L=64 N) for auroral and subauroral zone of the magnetosphere. Thus, in 95% of the cases when VLF wave excitation occurred the generation of long periodic geomagnetic pulsations Pc5 were observed. The observations also show that geomagnetic pulsations Pc5 are excited simultaneously or insignificantly later than VLF waves. In fact these two phenomena are associated genetically: the excitation of VLF waves leads to the generation of geomagnetic pulsations Pc5. The observations show intensive generation of geomagnetic pulsations during thunderstorms. Using an electromagnetic noise monitoring system covering the ULF range (0.01-10 Hz) A.S. Fraser-Smith observed intensive ULF electromagnetic wave during a large thunderstorm near the San-Francisco Bay area on September 23, 1990. According to this data the most significant amplification in ULF wave activity was observed for waves with a frequency of 0.01 Hz and it is entirely possible that stronger enhancements would have been measured at lower frequencies.

Yukhimuk, V.; Roussel-Dupre, R.

1997-04-01T23:59:59.000Z

435

consumer apps list view | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

consumer apps list view consumer apps list view Consumer Data Apps Challenges Resources About Blogs Let's Talk Feedback Consumer You are here Data.gov » Communities » Consumer Smart Disclosure Apps This page highlights apps and websites that use Smart Disclosure-style data to empower consumers to make better informed choices. The purpose is to illustrate the kinds of innovative apps-web- and mobile-based-that Smart Disclosure can fuel. The galleries below include both government-produced apps and apps created by innovators outside government that have won Federal challenges. Showing 1 - 19 of 19 results. Resources sort ascending Type Last Updated On Smart Traveler Smart Traveler, the official State Department app for U.S. travelers, invites you to see the world with easy access to frequently updated official country information, travel alerts, travel warnings, maps, U.S. embassy locations, and more. Mobile 09/14/2012

436

SOAJ Search : Main View : Deep Federated Search  

Office of Scientific and Technical Information (OSTI)

SOAJ Search SOAJ Search Search Powered By Deep Web Technologies New Search Preferences Powered by Deep Web Technologies HOME ABOUT ADVANCED SEARCH CONTACT US HELP Science Open Access Journals (SOAJ) Science Open Access Journals Main View This view is used for searching all possible sources. Additional Information Keyword: Title: Additional Information Author: Fields to Match: All Any Field(s) Additional Information Date Range: Beginning Date Range Pick Year 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 toEnding Date Range Pick Year 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 DWT Logo Search Clear All Help Simple Search Select All

437

Reasearch apps list view | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Reasearch apps list view Reasearch apps list view Research Menu Data/Tools Apps Resources Let's Talk Research Alpha You are here Data.gov » Communities » Research Applications Showcase Showing 1 - 6 of 6 results. Resources sort ascending Type Last Updated On Wireless Spectrum Research & Development Senior Steering Group's Testbed Information Portal The Wireless Spectrum Research & Development Senior Steering Group's Testbed Information Portal provides information about spectrum testing facilities to government, academic, and industry researchers in need of such facilities. Apps 11/20/2012 The R&D Dashboard The R&D Dashboard beta website provides an initial look at U.S. Federal investments in science and research from two agencies: the National Institutes of Health (NIH) and the National Science Foundation (NSF) from years 2000-2009. The R&D Dashboard will expand in a future iteration to include ALL Federal research and development spending and expanded information on outputs. Apps 11/20/2012

438

An nual En ergy Re view 2001  

Gasoline and Diesel Fuel Update (EIA)

An nual En ergy Re view 2001 An nual En ergy Re view 2001 The An nual En ergy Re view (AER) pres ents the En ergy In for ma tion Ad min - is tra tion's his tor i cal en ergy sta tis tics. For many se ries, sta tis tics are given for ev ery year from 1949 through 2001. The sta tis tics, ex pressed in ei ther phys i cal units or Brit ish ther mal units, cover all ma jor en ergy ac tiv i ties, in - clud ing con sump tion, pro duc tion, trade, stocks, and prices, for all ma jor en - ergy com mod i ties, in clud ing fos sil fu els, elec tric ity, and re new able en ergy sources. Pub li ca tion of this re port is re quired un der Pub lic Law 95-91 (De part ment of En ergy Or ga ni za tion Act), Sec tion 205(c), and is in keep ing with re spon - si bil i ties given to the En ergy In for ma tion Ad min is tra tion un der Sec tion

439

Planar optical waveguide based sandwich assay sensors and processes for the detection of biological targets including protein markers, pathogens and cellular debris  

DOE Patents (OSTI)

An assay element is described including recognition ligands bound to a film on a single mode planar optical waveguide, the film from the group of a membrane, a polymerized bilayer membrane, and a self-assembled monolayer containing polyethylene glycol or polypropylene glycol groups therein and an assay process for detecting the presence of a biological target is described including injecting a biological target-containing sample into a sensor cell including the assay element, with the recognition ligands adapted for binding to selected biological targets, maintaining the sample within the sensor cell for time sufficient for binding to occur between selected biological targets within the sample and the recognition ligands, injecting a solution including a reporter ligand into the sensor cell; and, interrogating the sample within the sensor cell with excitation light from the waveguide, the excitation light provided by an evanescent field of the single mode penetrating into the biological target-containing sample to a distance of less than about 200 nanometers from the waveguide thereby exciting the fluorescent-label in any bound reporter ligand within a distance of less than about 200 nanometers from the waveguide and resulting in a detectable signal.

Martinez, Jennifer S. (Santa Fe, NM); Swanson, Basil I. (Los Alamos, NM); Grace, Karen M. (Los Alamos, NM); Grace, Wynne K. (Los Alamos, NM); Shreve, Andrew P. (Santa Fe, NM)

2009-06-02T23:59:59.000Z

440

Coaxial recess integration of InGaAs edge emitting laser diodes with waveguides on silicon substrates : a complete solution to laser integration on ICs  

E-Print Network (OSTI)

In this thesis, the first demonstration of the full integration of 1.55[mu]m InGaAs/InP edge emitting platelet laser diodes with SiON/SiO2 dielectric waveguides on a silicon substrate is presented. Small footprint laser ...

Famenini, Shaya

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

About nonlinear contractive conditions on cone metric spaces  

E-Print Network (OSTI)

In the present work we shall show that nonlinear contractive conditions on TVS-cone metric spaces can be reduced to nonlinear contractive conditions on usual metric spaces. Our results extend the results of Du (2010) [W.S. Du, A note on cone metric fixed point theory and its equivalence, Nonlinear Anal. 72 (2010), 2259-2261] and results of Abdeljawad and Rezapour [T. Abdeljawad, Sh. Rezapour, Some fixed point results in TVS-cone metric spaces, Fixed Point Theory (to appear 2012)].

Olaru, Ion

2011-01-01T23:59:59.000Z

442

Oblique propagation of nonlinear electrostatic waves in dense astrophysical magnetoplasmas  

SciTech Connect

Nonlinear quantum ion-acoustic waves in dense dissipative as well as non-dissipative magnetized plasmas are investigated employing the quantum hydrodynamic model. In this regard, Zakharov Kuznetsov Burgers equation is derived in quantum plasmas, for the first time, using the small amplitude perturbation expansion method. The unique features of nonlinear electrostatic structures in pure electron-ion quantum magnetoplasma are highlighted and the parametric domain of the applicability of the model is unequivocally expressed. The present study may be useful to understand the nonlinear propagation characteristics of electrostatic shock and solitary structures in dense astrophysical systems where the quantum effects are expected to dominate.

Masood, W.; Siddiq, M. [Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad 54000 (Pakistan); National Centre for Physics (NCP), Shahdara Valley Road, 44000, Islamabad (Pakistan); Rizvi, H. [Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad 54000 (Pakistan)

2011-10-15T23:59:59.000Z

443

Organic nonlinear crystals and high power frequency conversion  

SciTech Connect

We are searching for a new second- and third-harmonic generators among the salts of chiral organic acids and bases. We discuss the relevant properties of crystals from this group of compounds, including their nonlinear and phasematching characteristics, linear absorption, damage threshold and crystal growth. In addition, we summarize what is known concerning other nonlinear optical properties of these crystals, such as two-photon absorption, nonlinear refractive index, and stimulated Raman thresholds. A preliminary assessment is made of the potential of these materials for use in future high power, large aperture lasers such as those used for inertial confinement fusion experiments. 14 refs., 1 fig., 3 tabs.

Velsko, S.P.; Davis, L.; Wang, F.; Monaco, S.; Eimerl, D.

1987-12-01T23:59:59.000Z

444

Analysis and design of robust decentralized controllers for nonlinear systems  

SciTech Connect

Decentralized control strategies for nonlinear systems are achieved via feedback linearization techniques. New results on optimization and parameter robustness of non-linear systems are also developed. In addition, parametric uncertainty in large-scale systems is handled by sensitivity analysis and optimal control methods in a completely decentralized framework. This idea is applied to alleviate uncertainty in friction parameters for the gimbal joints on Space Station Freedom. As an example of decentralized nonlinear control, singular perturbation methods and distributed vibration damping are merged into a control strategy for a two-link flexible manipulator.

Schoenwald, D.A.

1993-07-01T23:59:59.000Z

445

OpenEI:Neutral point of view | Open Energy Information  

Open Energy Info (EERE)

given to minor points of view. Neutral point of view is a principal core policy of the OpenEI platform. For further information, please refer to our model for this policy,...

446

JOBAID-VIEWING AN EMPLOYEE MATRIX (SUPERVISOR) | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

VIEWING AN EMPLOYEE MATRIX (SUPERVISOR) JOBAID-VIEWING AN EMPLOYEE MATRIX (SUPERVISOR) The purpose of this job aid is to guide supervisor users through the step-by-step process of...

447

Nonlinear gyrofluid simulations of collisionless reconnection  

SciTech Connect

The Hamiltonian gyrofluid model recently derived by Waelbroeck et al. [Phys. Plasmas 16, 032109 (2009)] is used to investigate nonlinear collisionless reconnection with a strong guide field by means of numerical simulations. Finite ion Larmor radius gives rise to a cascade of the electrostatic potential to scales below both the ion gyroradius and the electron skin depth. This cascade is similar to that observed previously for the density and current in models with cold ions. In addition to density cavities, the cascades create electron beams at scales below the ion gyroradius. The presence of finite ion temperature is seen to modify, inside the magnetic island, the distribution of the velocity fields that advect two Lagrangian invariants of the system. As a consequence, the fine structure in the electron density is confined to a layer surrounding the separatrix. Finite ion Larmor radius effects produce also a different partition between the electron thermal, potential, and kinetic energy, with respect to the cold-ion case. Other aspects of the dynamics such as the reconnection rate and the stability against Kelvin-Helmholtz modes are similar to simulations with finite electron compressibility but cold ions.

Grasso, D. [Istituto Sistemi Complessi, CNR, Via dei Taurini 19, 00185 Rome (Italy) and Dipartimento di Energetica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino (Italy); Tassi, E. [Centre de Physique Theorique, CNRS-Aix-Marseille Universites, Campus de Luminy, case 907, F-13288 Marseille Cedex 09 (France); Waelbroeck, F. L. [Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712-1060 (United States)

2010-08-15T23:59:59.000Z

448

Linear and nonlinear transient heat conduction in nuclear waste repositories  

Science Conference Proceedings (OSTI)

Analytical solutions of thermal problems connected with the disposal of nuclear wastes are presented. Linear and nonlinear diffusion problems are analyzed considering time-dependent heat sources. Comparisons between the temperature distributions at a ...

C. A. Estrada-Gasca; M. H. Cobble

1988-10-01T23:59:59.000Z

449

Precipitation Nowcasting by a Spectral-Based Nonlinear Stochastic Model  

Science Conference Proceedings (OSTI)

A novel rainfall nowcasting method based on the combination of an empirical nonlinear transformation of measured precipitation fields and the stochastic evolution in spectral space of the transformed fields is introduced. The power spectrum and ...

Sabino Metta; Jost von Hardenberg; Luca Ferraris; Nicola Rebora; Antonello Provenzale

2009-10-01T23:59:59.000Z

450

An Iterative EnKF for Strongly Nonlinear Systems  

Science Conference Proceedings (OSTI)

The study considers an iterative formulation of the ensemble Kalman filter (EnKF) for strongly nonlinear systems in the perfect-model framework. In the first part, a scheme is introduced that is similar to the ensemble randomized maximal ...

Pavel Sakov; Dean S. Oliver; Laurent Bertino

2012-06-01T23:59:59.000Z

451

Decentralized nonlinear adaptive control of an HVAC system  

Science Conference Proceedings (OSTI)

This paper presents a new decentralized nonlinear adaptive controller (DNAC) for a heating, ventilating, and air conditioning (HVAC) system capable of maintaining comfortable conditions under varying thermal loads. In this scheme, an HVAC system is considered ...

Zhang Huaguang; Lilong Cai

2002-11-01T23:59:59.000Z

452

Nonlinear Internal Wave Evolution in the Sulu Sea  

Science Conference Proceedings (OSTI)

This paper presents an analytical investigation of nonlinear internal wave evolution in the Sulu Sea. A solitary wave theory that describes tie evolution of internal solitons has been developed and expanded to include effects of vertical shear, ...

Antony K. Liu; James R. Holbrook; John R. Apel

1985-12-01T23:59:59.000Z

453

MODELING OF STATIC MINING SUBSIDENCE IN A NONLINEAR MEDIUM  

E-Print Network (OSTI)

Assistant Secretary for Fossil Energy, Office of Oil Shale,Division of Oil, Gas, and Shale Tech- nology, and theA NONLINEAR ~lliDIUM Prepared for Oil Shale Group Energy and

Ratigan, J.L.

2013-01-01T23:59:59.000Z

454

Stabilization of a nonlinear anaerobic wastewater treatment model  

Science Conference Proceedings (OSTI)

A nonlinear anaerobic digester model of wastewater treatment plants is considered. The stabilizability of the dynamic system is studied and a continuous stabilizing feedback, depending only on an on-line measurable variable, is proposed. Computer simulations ...

Neli S. Dimitrova; Mikhail I. Krastanov

2005-06-01T23:59:59.000Z

455

Observations of Polarity Reversal in Shoaling Nonlinear Internal Waves  

Science Conference Proceedings (OSTI)

Observations off the New Jersey coast document the shoaling of three groups of nonlinear internal waves of depression over 35 km across the shelf. Each wave group experienced changing background conditions along its shoreward transit. Despite ...

E. L. Shroyer; J. N. Moum; J. D. Nash

2009-03-01T23:59:59.000Z

456

Stable Schemes for Nonlinear Vertical Diffusion in Atmospheric Circulation Models  

Science Conference Proceedings (OSTI)

The intensity of vertical mixing in atmospheric models generally depends on wind shear and static stability, making the diffusion process nonlinear. Traditional implicit numerical schemes, which treat the variables to be diffused implicitly but ...

Claude Girard; Yves Delage

1990-03-01T23:59:59.000Z

457

Sparse non-linear least squares optimization for geometric vision  

Science Conference Proceedings (OSTI)

Several estimation problems in vision involve the minimization of cumulative geometric error using non-linear least-squares fitting. Typically, this error is characterized by the lack of interdependence among certain subgroups of the parameters to be ...

Manolis I. A. Lourakis

2010-09-01T23:59:59.000Z

458

Experimental mathematics: the role of computation in nonlinear science  

Science Conference Proceedings (OSTI)

Computers have expanded the range of nonlinear phenomena that can be explored mathematically. An “experimental mathematics facility,” containing both special-purpose dedicated machines and general-purpose mainframes, may someday provide the ...

David Campbell; Doyne Farmer; Jim Crutchfield; Erica Jen

1985-04-01T23:59:59.000Z

459

Geometric manipulation of light : from nonlinear optics to invisibility cloaks  

E-Print Network (OSTI)

In this work, we study two different manipulations of electromagnetic waves governed by macroscopic Maxwell's equations. One is frequency conversion of such waves using small intrinsic material nonlinearities. We study ...

Hashemi, Hila

2012-01-01T23:59:59.000Z

460

Enhanced Computational Methods for Nonlinear Hamiltonian Wave Dynamics  

Science Conference Proceedings (OSTI)

It is noted that the nonlinear Hamiltonian dynamical equations describing surface waves are of convolution form in a version derived by Krasitskii. By virtue of the convolution theorem for Fourier transforms, the dynamical equations are thus ...

Jorge F. Willemsen

1998-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Advanced Data Assimilation in Strongly Nonlinear Dynamical Systems  

Science Conference Proceedings (OSTI)

Advanced data assimilation methods are applied to simple but highly nonlinear problems. The dynamical systems studied here are the stochastically forced double well and the Lorenz model. In both systems, linear approximation of the dynamics about ...

Robert N. Miller; Michael Ghil; François Gauthiez

1994-04-01T23:59:59.000Z

462

On Massively Parallel Algorithm for Nonlinear Stochastic Network Problems  

E-Print Network (OSTI)

We develop an algorithm for solving nonlinear two-stage stochastic problems with network recourse. The algorithm is based on the framework of row-action methods. The problem is formulated by replicating the first-stage ...

Nielson, Soren S.

463

A Nonlinear Artificial Intelligence Ensemble Prediction Model for Typhoon Intensity  

Science Conference Proceedings (OSTI)

A new nonlinear artificial intelligence ensemble prediction (NAIEP) model has been developed for predicting typhoon intensity based on multiple neural networks with the same expected output and using an evolutionary genetic algorithm (GA). The ...

Long Jin; Cai Yao; Xiao-Yan Huang

2008-12-01T23:59:59.000Z

464

Nonlinear Planetary Wave Reflection in an Atmospheric GCM  

Science Conference Proceedings (OSTI)

The nonlinear behavior of planetary waves excited by midlatitude topography is considered in an atmospheric GCM. The GCM is run at standard resolution (T42) and includes all of the complexity normally associated with a GCM. Only two ...

Christopher C. Walker; Gudrun Magnusdottir

2003-01-01T23:59:59.000Z

465

Neural Network Control of Robot Manipulators and Nonlinear Systems  

Science Conference Proceedings (OSTI)

From the Publisher:This graduate text provides an authoritative account of neural network (NN) controllers for robotics and nonlinear systems and gives the first textbook treatment of a general and streamlined design procedure for NN controllers. Stability ...

F. L. Lewis; A. Yesildirak; Suresh Jagannathan

1998-09-01T23:59:59.000Z

466

Views and Patterns in E-Commerce Application Design  

Science Conference Proceedings (OSTI)

Separation of concerns is a well-established principle in software engineering that supports reuse by hiding complexity through abstraction mechanisms. The Abstract Design Views model was created with reuse in mind and allows the designer to apply separation ... Keywords: abstract design views, design, design patterns, object-oriented relationships, reuse, separation of concerns, software engineering, views

Marcus E. Markiewicz; Carlos J. P. Lucena; Paulo S. C. Alencar; Donald D. Cowan

2002-06-01T23:59:59.000Z

467

Stabilization of vortex solitons in nonlocal nonlinear media  

SciTech Connect

We study the evolution of vortex solitons in optical media with a nonlocal nonlinear response. We employ a modulation theory for the vortex parameters based on an averaged Lagrangian, and analyze the azimuthal evolution of both the vortex width and diffractive radiation. We describe analytically the physical mechanism for vortex stabilization due to the long-range nonlocal nonlinear response, the effect observed earlier in numerical simulations only.

Minzoni, Antonmaria A. [Fenomenos Nonlineales y Mecanica (FENOMEC), Department of Mathematics and Mechanics, Instituto de Investigacion en Matematicas Aplicadas y Sistemas, Universidad Nacional Autonoma de Mexico, 01000 Mexico D.F. (Mexico); Smyth, Noel F. [School of Mathematics and Maxwell Institute for Mathematical Sciences, University of Edinburgh, Edinburgh EH9 3JZ, Scotland (United Kingdom); Worthy, Annette L. [School of Mathematics and Applied Statistics, University of Wollongong, Wollongong NSW 2522 (Australia); Kivshar, Yuri S. [Nonlinear Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200 (Australia)

2007-12-15T23:59:59.000Z

468

Asymmetric parametric amplification in nonlinear left-handed transmission lines  

E-Print Network (OSTI)

We study parametric amplification in nonlinear left-handed transmission lines, which serve as model systems for nonlinear negative index metamaterials. We experimentally demonstrate amplification of a weak pump signal in three regimes: with the signal in the left-handed band, with the signal in the stop band, and with the signal at a defect frequency. In particular, we demonstrate the amplification of the incident wave by up to 15dB in the left-handed regime.

Powell, David A; Kivshar, Yuri S

2008-01-01T23:59:59.000Z

469

Epileptic seizure prediction by non-linear methods  

DOE Patents (OSTI)

Methods and apparatus for automatically predicting epileptic seizures monitor and analyze brain wave (EEG or MEG) signals. Steps include: acquiring the brain wave data from the patient; digitizing the data; obtaining nonlinear measures of the data via chaotic time series analysis tools; obtaining time serial trends in the nonlinear measures; comparison of the trend to known seizure predictors; and providing notification that a seizure is forthcoming.

Hively, Lee M. (Knoxville, TN); Clapp, Ned E. (Knoxville, TN); Daw, C. Stuart (Knoxville, TN); Lawkins, William F. (Knoxville, TN)

1999-01-01T23:59:59.000Z

470

Some Thoughts on Stability in Nonlinear Periodic Focusing Systems [Addendum  

DOE R&D Accomplishments (OSTI)

Addendum to September 5, 1967 report with the same title and with the abstract: A brief discussion is given of the long-term stability of particle motions through periodic focusing structures containing lumped nonlinear elements. A method is presented whereby one can specify the nonlinear elements in such a way as to generate a variety of structures in which the motion has long-term stability.

McMillan, Edwin M.

1968-03-29T23:59:59.000Z

471

Group classification for the nonlinear heat conductivity equation  

E-Print Network (OSTI)

Symmetry properties of the nonlinear heat conductivity equations of the general form $u_t=[E(x,u)u_x]_x + H(x,u)$ is studied. The point symmetry analysis of these equations is considered as well as an equivalence classification which admits an extension by one dimension of the principal Lie algebra of the equation. The invariant solutions of equivalence transformations and classification of the nonlinear heat conductivity equations among with additional operators are also given.

Mahdipour-Shirayeh, Ali

2009-01-01T23:59:59.000Z

472

Nonlinear dependence of the renormalization scale on test functions  

E-Print Network (OSTI)

Quantum electrodynamics exhibits an informal nonlinear dependence on Lorentz invariant test function properties that determine the renormalization scale, such as Mandelstam variables, contrary to the linear dependence on test functions that is required by the Wightman axioms. A first example of an alternative interacting quantum field formalism that has a comparable weakly nonlinear dependence on Dirac spinor test functions is constructed, using U(1)-gauge connections and U(1)-gauge invariant Dirac spinor test functions.

Morgan, Peter

2013-01-01T23:59:59.000Z

473

Epileptic seizure prediction by non-linear methods  

DOE Patents (OSTI)

This research discloses methods and apparatus for automatically predicting epileptic seizures monitor and analyze brain wave (EEG or MEG) signals. Steps include: acquiring the brain wave data from the patient; digitizing the data; obtaining nonlinear measures of the data via chaotic time series analysis tools; obtaining time serial trends in the nonlinear measures; comparison of the trend to known seizure predictors; and providing notification that a seizure is forthcoming. 76 figs.

Hively, L.M.; Clapp, N.E.; Day, C.S.; Lawkins, W.F.

1999-01-12T23:59:59.000Z

474

Relativistic effects on nonlinear lower hybrid oscillations in cold plasma  

Science Conference Proceedings (OSTI)

Nonlinear lower hybrid mode in a quasineutral magnetized plasma is analyzed in one space dimension using Lagrangian coordinates. In a cold fluid, we treat electron fluid relativistically, whereas ion fluid nonrelativistically. The homotopy perturbation method is employed to obtain the nonlinear solution which also finds the frequency-amplitude relationship for the lower hybrid mode. The solution indicates that the amplitude of oscillation increases due to the weak relativistic effects. The appearance of density spikes is not ruled out in a magnetized plasma.

Maity, Chandan; Chakrabarti, Nikhil [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India); Sengupta, Sudip [Institute of Plasma Research, Bhat, Gandhinagar 382 428 (India)

2011-04-15T23:59:59.000Z

475

OPTCON: an algorithm for the optimal control of nonlinear stochastic models  

Science Conference Proceedings (OSTI)

Keywords: control algorithm, dynamic systems, nonlinear systems, optimal control, optimal economic policies, stochastic control

Josef Matulka; Reinhard Neck

1992-01-01T23:59:59.000Z

476

ASNOM mapping of SiC epi-layer doping profile and of surface phonon polariton waveguiding  

E-Print Network (OSTI)

The apertureless SNOM mapping of the slightly-doped 4H-SiC epitaxial layer grown on a heavily-doped 4H-SiC substrate was performed with a cleaved edge geometry. ASNOM images taken at the light frequencies of a $C^{13}O_{2}^{16}$ laser show a clear contrast between the substrate and the epitaxial layer. The contrast vanishes at the laser frequency of $884cm^{-1}$, and gets clearer at higher frequencies $(923cm^{-1})$. This can be explained by changes in the local polarizability of SiC caused by the carrier concentration, which are more pronounced at higher frequencies. Since the light frequency is tuned up further ($935cm^{-1}$), a transversal mode structure appears in the ASNOM map, indicating a waveguide-like confinement of a surface phonon polariton wave inside the strip of an epi-layer outcrop.

Kazantsev, Dmitry

2013-01-01T23:59:59.000Z

477

Studies in nonlinear problems of energy  

Science Conference Proceedings (OSTI)

Emphasis has been on combustion and flame propagation. The research program was on modeling, analysis and computation of combustion phenomena, with emphasis on transition from laminar to turbulent combustion. Nonlinear dynamics and pattern formation were investigated in the transition. Stability of combustion waves, and transitions to complex waves are described. Combustion waves possess large activation energies, so that chemical reactions are significant only in thin layers, or reaction zones. In limit of infinite activation energy, the zones shrink to moving surfaces, (fronts) which must be found during the analysis, so that (moving free boundary problems). The studies are carried out for limiting case with fronts, while the numerical studies are carried out for finite, though large, activation energy. Accurate resolution of the solution in the reaction zones is essential, otherwise false predictions of dynamics are possible. Since the the reaction zones move, adaptive pseudo-spectral methods were developed. The approach is based on a synergism of analytical and computational methods. The numerical computations build on and extend the analytical information. Furthermore, analytical solutions serve as benchmarks for testing the accuracy of the computation. Finally, ideas from analysis (singular perturbation theory) have induced new approaches to computations. The computational results suggest new analysis to be considered. Among the recent interesting results, was spatio-temporal chaos in combustion. One goal is extension of the adaptive pseudo-spectral methods to adaptive domain decomposition methods. Efforts have begun to develop such methods for problems with multiple reaction zones, corresponding to problems with more complex, and more realistic chemistry. Other topics included stochastics, oscillators, Rysteretic Josephson junctions, DC SQUID, Markov jumps, laser with saturable absorber, chemical physics, Brownian movement, combustion synthesis, etc.

Matkowsky, B.J.

1992-07-01T23:59:59.000Z

478

Mountain View IV | Open Energy Information  

Open Energy Info (EERE)

IV IV Facility Mountain View IV Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner AES Wind Generation Developer AES Wind Generation Energy Purchaser Southern California Edison Co Location White Water CA Coordinates 33.95475187°, -116.7015839° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":33.95475187,"lon":-116.7015839,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

479

Consumer Views on Transportation and Energy  

DOE Green Energy (OSTI)

This report has been assembled to provide the Office of Energy Efficiency and Renewable Energy (EERE) with an idea of how the American public views various transportation, energy, and environmental issues. An issue that still needs attention from EERE is the finding that the public tends to lack information about hybrid vehicles, hydrogen, and alternative fuels for passenger vehicles. Also, the public seems to want fuel-efficiency improvements and cleaner fuels, but is not very willing to pay for these benefits. The public also says that it supports initiatives to promote energy conservation over increased production and that it is willing to make changes such as driving less in an effort to reduce oil consumption.

Steiner, E.

2003-08-01T23:59:59.000Z

480

Metalorganic molecular beam epitaxial growth of semi-insulating GaInAsP (? g =1.05?? m ): Fe optical waveguides for integrated photonic devices  

Science Conference Proceedings (OSTI)

Irondoping of InP and GaInAsP (? g =1.05?? m ) layers grown by metalorganic molecular beam epitaxy was studied using elemental sourcematerial in combination with a conventional effusion cell. This study was aimed at the creation of semi-insulating optical waveguides under growth conditions compatible with selective area growth. Secondary ion mass spectroscopy measurements revealed a reproducible and homogeneous incorporation behavior of the irondopant in the materials investigated. Resistivities in excess of 10 9 ??? cm were obtained for both compositions at medium doping levels. GaInAsP/InP waveguide structures grown at 485?° C —the minimum temperature necessary for selective deposition—exhibited averaged resistivities of 5×10 7 ??? cm in combination with optical losses of 2.5±0.5? dB/cm .

H. Künzel; P. Albrecht; S. Ebert; R. Gibis; P. Harde; R. Kaiser; H. Kizuki; S. Malchow

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Evaluation of ITER MSE Viewing Optics  

Science Conference Proceedings (OSTI)

The Motional Stark Effect (MSE) diagnostic on ITER determines the local plasma current density by measuring the polarization angle of light resulting from the interaction of a high energy neutral heating beam and the tokamak plasma. This light signal has to be transmitted from the edge and core of the plasma to a polarization analyzer located in the port plug. The optical system should either preserve the polarization information, or it should be possible to reliably calibrate any changes induced by the optics. This LLNL Work for Others project for the US ITER Project Office (USIPO) is focused on the design of the viewing optics for both the edge and core MSE systems. Several design constraints were considered, including: image quality, lack of polarization aberrations, ease of construction and cost of mirrors, neutron shielding, and geometric layout in the equatorial port plugs. The edge MSE optics are located in ITER equatorial port 3 and view Heating Beam 5, and the core system is located in equatorial port 1 viewing heating beam 4. The current work is an extension of previous preliminary design work completed by the ITER central team (ITER resources were not available to complete a detailed optimization of this system, and then the MSE was assigned to the US). The optimization of the optical systems at this level was done with the ZEMAX optical ray tracing code. The final LLNL designs decreased the ''blur'' in the optical system by nearly an order of magnitude, and the polarization blur was reduced by a factor of 3. The mirror sizes were reduced with an estimated cost savings of a factor of 3. The throughput of the system was greater than or equal to the previous ITER design. It was found that optical ray tracing was necessary to accurately measure the throughput. Metal mirrors, while they can introduce polarization aberrations, were used close to the plasma because of the anticipated high heat, particle, and neutron loads. These mirrors formed an intermediate image that then was relayed out of the port plug with more ideal (dielectric) mirrors. Engineering models of the optics, port plug, and neutral beam geometry were also created, using the CATIA ITER models. Two video conference calls with the USIPO provided valuable design guidelines, such as the minimum distance of the first optic from the plasma. A second focus of the project was the calibration of the system. Several different techniques are proposed, both before and during plasma operation. Fixed and rotatable polarizers would be used to characterize the system in the no-plasma case. Obtaining the full modulation spectrum from the polarization analyzer allows measurement of polarization effects and also MHD plasma phenomena. Light from neutral beam interaction with deuterium gas (no plasma) has been found useful to determine the wavelength of each spatial channel. The status of the optical design for the edge (upper) and core (lower) systems is included in the following figure. Several issues should be addressed by a follow-on study, including whether the optical labyrinth has sufficient neutron shielding and a detailed polarization characterization of actual mirrors.

Allen, S; Lerner, S; Morris, K; Jayakumar, J; Holcomb, C; Makowski, M; Latkowski, J; Chipman, R

2007-03-26T23:59:59.000Z

482

Nonlinear softening as a predictive precursor to climate tipping  

E-Print Network (OSTI)

Approaching a dangerous bifurcation, from which a dynamical system such as the Earth's climate will jump (tip) to a different state, the current stable state lies within a shrinking basin of attraction. Persistence of the state becomes increasingly precarious in the presence of noisy disturbances. We consider an underlying potential, as defined theoretically for a saddle-node fold and (via averaging) for a Hopf bifurcation. Close to a stable state, this potential has a parabolic form; but approaching a jump it becomes increasingly dominated by softening nonlinearities. If we have already detected a decrease in the linear decay rate, nonlinear information allows us to estimate the propensity for early tipping due to noise. We argue that one needs to extract information about the nonlinear features (a "softening") of the underlying potential from the time series to judge the probability and timing of tipping. This analysis is the logical next step if one has detected a decrease of the linear decay rate. If there is no discernable trend in the linear analysis, nonlinear softening is even more important in showing the proximity to tipping. After extensive normal form calibration studies, we check two geological time series from paleo-climate tipping events for softening of the underlying well. For the ending of the last ice age, where we find no convincing linear precursor, we identify a statistically significant nonlinear softening towards increasing temperature. The analysis has thus successfully detected a warning of the imminent tipping event.

Jan Sieber; J. Michael T. Thompson

2011-03-15T23:59:59.000Z

483

An analog model for quantum lightcone fluctuations in nonlinear optics  

SciTech Connect

We propose an analog model for quantum gravity effects using nonlinear dielectrics. Fluctuations of the spacetime lightcone are expected in quantum gravity, leading to variations in the flight times of pulses. This effect can also arise in a nonlinear material. We propose a model in which fluctuations of a background electric field, such as that produced by a squeezed photon state, can cause fluctuations in the effective lightcone for probe pulses. This leads to a variation in flight times analogous to that in quantum gravity. We make some numerical estimates which suggest that the effect might be large enough to be observable. - Highlights: Black-Right-Pointing-Pointer Lightcone fluctuations, quantum fluctuations of the effective speed of light, are a feature of quantum gravity. Black-Right-Pointing-Pointer Nonlinear dielectrics have a variable speed of light, analogous to the effects of gravity. Black-Right-Pointing-Pointer Fluctuating electric fields create the effect of lightcone fluctuations in a nonlinear material. Black-Right-Pointing-Pointer We propose to use squeezed light in a nonlinear material as an analog model of lightcone fluctuations. Black-Right-Pointing-Pointer Variation in the speed of propagation of pulses is the observational signature of lightcone fluctuations.

Ford, L.H., E-mail: ford@cosmos.phy.tufts.edu [Institute of Cosmology, Department of Physics and Astronomy, Tufts University, Medford, MA 02155 (United States); De Lorenci, V.A., E-mail: delorenci@unifei.edu.br [Instituto de Ciencias Exatas, Universidade Federal de Itajuba, Itajuba, MG 37500-903 (Brazil); Menezes, G., E-mail: gsm@ift.unesp.br [Instituto de Fisica Teorica, Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz 271 - Bloco II, 01140-070 Sao Paulo, SP (Brazil); Svaiter, N.F., E-mail: nfuxsvai@cbpf.br [Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ (Brazil)

2013-02-15T23:59:59.000Z

484

Time growth rate and field profiles of hybrid modes excited by a relativistic elliptical electron beam in an elliptical metallic waveguide with dielectric rod  

Science Conference Proceedings (OSTI)

The dispersion relation of guided electromagnetic waves propagating in an elliptical metallic waveguide with a dielectric rod driven by relativistic elliptical electron beam (REEB) is investigated. The electric field profiles and the growth rates of the waves are numerically calculated by using Mathieu functions. The effects of relative permittivity constant of dielectric rod, accelerating voltage, and current density of REEB on the growth rate are presented.

Jazi, B.; Rahmani, Z.; Abdoli-Arani, A. [Faculty of Physics, Department of Laser and Photonics, University of Kashan, Kashan (Iran, Islamic Republic of); Heidari-Semiromi, E. [Faculty of Physics, Department of Condense Matter, University of Kashan, Kashan (Iran, Islamic Republic of)

2012-10-15T23:59:59.000Z

485

Argonne CNM News: Frequency stabilization in nonlinear micromechanical  

NLE Websites -- All DOE Office Websites (Extended Search)

Frequency Stabilization in Nonlinear Micromechanical Oscillators Frequency Stabilization in Nonlinear Micromechanical Oscillators SEM image of one resonator and finite-element simulations of the dynamic deformation characteristics of the coupled vibrational modes SEM image (center) of one resonator and finite-element simulations of the dynamic deformation characteristics of the coupled vibrational modes. The lengths of the three interconnected beams, between the comb-drive electrodes, range from 10 to 500 µm. Using Center for Nanoscale Materials (CNM) expertise in the design and fabrication of micro- and nanoscale devices, a new strategy for engineering low-frequency noise oscillators capitalizes on the intrinsic nonlinear phenomena of micro- and nanomechanical resonators. A fundamental limitation of such resonators was addressed by a team of researchers from the

486

Scientists use world's fastest computer to understand nonlinear physics of  

NLE Websites -- All DOE Office Websites (Extended Search)

Nonlinear physics of high-power lasers Nonlinear physics of high-power lasers Scientists use world's fastest computer to understand nonlinear physics of high-power lasers To achieve fusion scientists must put as much laser energy on target as possible. October 28, 2009 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Contact

487

Quantum Gibbs distribution from dynamical thermalization in classical nonlinear lattices  

E-Print Network (OSTI)

We study numerically time evolution in classical lattices with weak or moderate nonlinearity which leads to interactions between linear modes. Our results show that in a certain strength range a moderate nonlinearity generates a dynamical thermalization process which drives the system to the quantum Gibbs distribution of probabilities, or average oscillation amplitudes. The effective dynamical temperature of the lattice varies from large positive to large negative values depending on energy of initially excited modes. This quantum Gibbs distribution is drastically different from usually expected energy equipartition over linear modes corresponding to a regime of classical thermalization. Possible experimental observations of this dynamical thermalization are discussed for cold atoms in optical lattices, nonlinear photonic lattices and optical fiber arrays.

Leonardo Ermann; Dima L. Shepelyansky

2013-07-22T23:59:59.000Z

488

NUMERICAL TEST OF IMPROVED NONLINEAR GUIDING CENTER THEORIES  

Science Conference Proceedings (OSTI)

Previous diffusion theories make diverse predictions concerning the ability of slab modes to scatter charged particles across the mean magnetic field. Whereas the original nonlinear guiding center theory provides a strong contribution of slab modes if a two-component model is employed, improved nonlinear guiding center theories describe cross-field transport due to slab modes as a subdiffusive process. Therefore, the slab fluctuations do not explicitly contribute to the perpendicular spatial diffusion coefficient in the late time limit. In the present article, numerical simulations are used to explore the validity of the different predictions. Only a very weak contribution is found due to slab modes. The numerical results confirm improved nonlinear guiding center theories. This conclusion has also implications for cross-field diffusion in three-dimensional turbulence.

Tautz, R. C. [Zentrum fuer Astronomie und Astrophysik, Technische Universitaet Berlin, Hardenbergstrasse 36, D-10623 Berlin (Germany); Shalchi, A., E-mail: rct@gmx.eu, E-mail: andreasm4@yahoo.com [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)

2011-07-10T23:59:59.000Z

489

Nonlinear magneto-optic effects in optically dense Rb vapor  

E-Print Network (OSTI)

Nonlinear magneto-optical effects, originated from atomic coherence, are studied both theoretically and experimentally in thermal Rb vapor. The analytical description of the fundamental properties of coherent media are based on the simplified three- and four-level systems, and then verified using numerical simulations and experimental measurements. In particular, we analyze the modification of the long-lived atomic coherence due to various physical effects, such as reabsorption of spontaneous radiation, collisions with a buffer gas atoms, etc. We also discuss the importance of the high-order nonlinearities in the description of the polarization rotation for the elliptically polarized light. The effect of self-rotation of the elliptical polarization is also analyzed. Practical applications of nonlinear magneto-optical effects are considered in precision metrology and magnetometery, and for the generation of non-classical states of electromagnetic field.

Novikova, Irina Borisovna

2006-05-01T23:59:59.000Z

490

Nonlinear beam deflection in photonic lattices with negative defects  

Science Conference Proceedings (OSTI)

We demonstrate both theoretically and experimentally that a nonlinear beam can be reflected by a negative defect in a photonic lattice if the incident angle is below a threshold value. Above this threshold angle, the beam simply passes through the defect. This phenomenon occurs in both one- and two-dimensional photonic lattices, and it provides a way to use the incident angle to control beam propagation in a lattice network. If the defect is absent or positive, no evident transition from reflection to transmission occurs. These nonlinear phenomena are also compared with linear nondiffracting-beam propagation in a photonic lattice with a defect, and both similarities and differences are observed. In addition, some important features in linear and nonlinear beam propagations are explained analytically by using a linear model with a delta-function defect.

Wang Jiandong [College of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054 (China); Ye Zhuoyi; Lou Cibo [TEDA Applied Physical School, Nankai University, Tianjin 300457 (China); Miller, Alexandra; Zhang Peng [Department of Physics and Astronomy, San Francisco State University, San Francisco, California 94132 (United States); Hu Yi; Chen Zhigang [TEDA Applied Physical School, Nankai University, Tianjin 300457 (China); Department of Physics and Astronomy, San Francisco State University, San Francisco, California 94132 (United States); Yang Jianke [Department of Mathematics and Statistics, University of Vermont, Burlington, Vermont 05401 (United States)

2011-03-15T23:59:59.000Z

491

Engineered optical nonlinearity for a quantum light source  

E-Print Network (OSTI)

Single-photon pairs created in the nonlinear process of spontaneous parametric downconversion form the backbone of fundamental and applied experimental quantum information science. Many applications benefit from careful spectral shaping of the single-photon wave-packets. In this paper we tailor the joint spectral wave-function of downconverted photons by modulating the nonlinearity of a poled crystal without affecting the phase-matching conditions. We designed a crystal with a Gaussian nonlinearity profile and confirmed successful wave-packet shaping by two-photon interference experiments. We numerically show how our method can be applied for attaining one of the currently most important goals of single-photon quantum optics, the creation of pure single photons without spectral correlations.

Agata M. Bra?czyk; Alessandro Fedrizzi; Timothy C. Ralph; Andrew G. White

2010-05-18T23:59:59.000Z

492

Nonlinear acoustic/seismic waves in earthquake processes  

Science Conference Proceedings (OSTI)

Nonlinear dynamics induced by seismic sources and seismic waves are common in Earth. Observations range from seismic strong ground motion (the most damaging aspect of earthquakes), intense near-source effects, and distant nonlinear effects from the source that have important consequences. The distant effects include dynamic earthquake triggering-one of the most fascinating topics in seismology today-which may be elastically nonlinearly driven. Dynamic earthquake triggering is the phenomenon whereby seismic waves generated from one earthquake trigger slip events on a nearby or distant fault. Dynamic triggering may take place at distances thousands of kilometers from the triggering earthquake, and includes triggering of the entire spectrum of slip behaviors currently identified. These include triggered earthquakes and triggered slow, silent-slip during which little seismic energy is radiated. It appears that the elasticity of the fault gouge-the granular material located between the fault blocks-is key to the triggering phenomenon.

Johnson, Paul A. [Geophysics Group, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos New Mexico 87544 (United States)

2012-09-04T23:59:59.000Z

493

Energy Use in Distillation Operation: Nonlinear Economic Effects  

E-Print Network (OSTI)

Distillation operations are major consumers of energy, by some estimates comprising forty percent of the energy usage in the refining and chemicals industry. Obtaining the maximum energy efficiency from this unit operation is obviously very important. For many distillation columns there is a tradeoff in operation between energy usage and product recovery and setting the proper usage target involves a calculation of the economic tradeoff between these two factors. However, distillation is a non-linear process and normal economic evaluations add more non-linearities to the economic objective functions. In addition, the normal product quality variability observed leads to requirements for statistical evaluation. Hence, calculation of the correct target can be complicated. In this paper, these non-linear economic effects are reviewed and techniques to calculate the correct usage targets presented.

White, D. C.

2010-01-01T23:59:59.000Z

494

Supply Chain - Additional Market Sectors View Page | Data.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Additional Market Sectors View Page Sustainable Supply Chains Submissions Let's Talk About Sustainable Supply Chain You are here Data.gov Communities Sustainable Supply Chain...

495

`Trapped' Ions Provide First View of Light Property  

Science Conference Proceedings (OSTI)

... PHYSICS `Trapped' Ions Provide First View of Light Property. ... Quantum theory states that light can act either as a wave or as a particle. ...

496

September 2013 Most Viewed Documents for Energy Storage, Conversion...  

Office of Scientific and Technical Information (OSTI)

September 2013 Most Viewed Documents for Energy Storage, Conversion, And Utilization Process Equipment Cost Estimation, Final Report H.P. Loh; Jennifer Lyons; Charles W. White, III...

497

The Better Buildings Neighborhood View - December 10, 2013  

NLE Websites -- All DOE Office Websites (Extended Search)

traditional incandescent bulbs? Consider installing energy efficient compact fluorescent light bulbs (CFLs) in your basement lighting fixtures. Light Neighborhood View to Become...

498

Most Viewed Documents by Subject Category | OSTI, US Dept of...  

Office of Scientific and Technical Information (OSTI)

Viewed Documents by Subject Category Biology and Medicine Chemistry Energy Storage, Conversion, and Utilization Engineering Environmental Sciences Fission and Nuclear Technologies...

499

January 2013 Most Viewed Documents for Energy Storage, Conversion...  

Office of Scientific and Technical Information (OSTI)

January 2013 Most Viewed Documents for Energy Storage, Conversion, And Utilization Energy Technology Perspectives 2012: Executive Summary Portuguese version NONE Energy...

500

Most Viewed Documents - Energy Storage, Conversion, and Utilization...  

Office of Scientific and Technical Information (OSTI)

Most Viewed Documents - Energy Storage, Conversion, and Utilization Process Equipment Cost Estimation, Final Report H.P. Loh; Jennifer Lyons; Charles W. White, III (2002)...