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Note: This page contains sample records for the topic "random vibration environment" 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

Stretched Polymers in Random Environment  

E-Print Network (OSTI)

We survey recent results and open questions on the ballistic phase of stretched polymers in both annealed and quenched random environments.

Dmitry Ioffe; Yvan Velenik

2010-11-01T23:59:59.000Z

2

MEMS reliability in a vibration environment  

Science Conference Proceedings (OSTI)

MicroElectricalMechanical Systems (MEMS) were subjected to a vibration environment that had a peak acceleration of 120g and spanned frequencies from 20 to 2000 Hz. The device chosen for this test was a surface-micromachined microengine because it possesses many elements (springs, gears, rubbing surfaces) that may be susceptible to vibration. The microengines were unpowered during the test. The authors observed 2 vibration-related failures and 3 electrical failures out of 22 microengines tested. Surprisingly, the electrical failures also arose in four microengines in the control group indicating that they were not vibration related. Failure analysis revealed that the electrical failures were due to shorting of stationary comb fingers to the ground plane.

TANNER,DANELLE M.; WALRAVEN,JEREMY A.; HELGESEN,KAREN SUE; IRWIN,LLOYD W.; GREGORY,DANNY LYNN; STAKE,JOHN R.; SMITH,NORMAN F.

2000-02-03T23:59:59.000Z

3

Central Limit Theorem for Branching Random Walks in Random Environment  

E-Print Network (OSTI)

We consider branching random walks in $d$-dimensional integer lattice with time-space i.i.d. offspring distributions. When $d \\ge 3$ and the fluctuation of the environment is well moderated by the random walk, we prove a central limit theorem for the density of the population, together with upper bounds for the density of the most populated site and the replica overlap. We also discuss the phase transition of this model in connection with directed polymers in random environment.

Nobuo Yoshida

2007-12-05T23:59:59.000Z

4

A fluctuation theorem in a random environment  

E-Print Network (OSTI)

A simple class of chaotic systems in a random environment is considered and the fluctuation theorem is extended under the assumption of reversibility.

F. Bonetto; G. Gallavotti; G. Gentile

2006-04-29T23:59:59.000Z

5

Localization for Branching Random Walks in Random Environment  

E-Print Network (OSTI)

We consider branching random walks in $d$-dimensional integer lattice with time-space i.i.d. offspring distributions. This model is known to exhibit a phase transition: If $d \\ge 3$ and the environment is "not too random", then, the total population grows as fast as its expectation with strictly positive probability. If,on the other hand, $d \\le 2$, or the environment is ``random enough", then the total population grows strictly slower than its expectation almost surely. We show the equivalence between the slow population growth and a natural localization property in terms of "replica overlap". We also prove a certain stronger localization property, whenever the total population grows strictly slower than its expectation almost surely.

Yueyun Hu; Nobuo Yoshida

2007-12-05T23:59:59.000Z

6

The Vibration Virtual Environment for Test Optimization (VETO)  

SciTech Connect

A new test simulation tool is being developed to support vibration test design and to evaluate the overall testability of a component or system. This environment, the Vibration Virtual Environment for Test Optimization (VETO), is utilized to optimally place vibration control and response transducers and to investigate the selection of test parameters needed in the design and performance of a vibration experiment. The engineer can investigate the effects of different control parameters prior to performing an actual vibration test. Additionally, new and existing fixture designs can be evaluated through the development of analytical or experimental models that can be integrated into the simulation environment. This test design environment also provides the engineer with the ability to combine analytically or experimentally derived models of the vibration test hardware, instrumentation and equipment into a simulation model that represents the vibration testing capability. Hardware-in-the-loop simulations can be conducted using this model to examine multiple facets of the test design. This paper presents a new tool that will assist test engineers in maximizing the value of vibration tests through the use of hardware-in-the-loop simulations.

Klenke, S.E.; Lauffer, J.P.; Gregory, D.L.; Togami, T.C.

1996-10-01T23:59:59.000Z

7

KNOTS AND RANDOM WALKS IN VIBRATED GRANULAR CHAINS  

Science Conference Proceedings (OSTI)

The authors study experimentally statistical properties of the opening times of knots in vertically vibrated granular chains. Our measurements are in good qualitative and quantitative agreement with a theoretical model involving three random walks interacting via hard core exclusion in one spatial dimension. In particular, the knot survival probability follows a universal scaling function which is independent of the chain length, with a corresponding diffusive characteristic time scale. Both the large-exit-time and the small-exit-time tails of the distribution are suppressed exponentially, and the corresponding decay coefficients are in excellent agreement with the theoretical values.

E. BEN-NAIM; ET AL

2000-08-01T23:59:59.000Z

8

Optimization of Piezoelectric Electrical Generators Powered by Random Vibrations  

E-Print Network (OSTI)

This paper compares the performances of a vibrationpowered electrical generators using PZT piezoelectric ceramic associated to two different power conditioning circuits. A new approach of the piezoelectric power conversion based on a nonlinear voltage processing is presented and implemented with a particular power conditioning circuit topology. Theoretical predictions and experimental results show that the nonlinear processing technique may increase the power harvested by a factor up to 4 compared to the Standard optimization technique. Properties of this new technique are analyzed in particular in the case of broadband, random vibrations, and compared to those of the Standard interface.

Lefeuvre, E; Richard, C; Petit, L; Guyomar, D

2007-01-01T23:59:59.000Z

9

Scaling limits for gradient systems in random environment  

E-Print Network (OSTI)

For interacting particle systems that satisfies the gradient condition, the hydrodynamic limit and the equilibrium fluctuations are well known. We prove that under the presence of a symmetric random environment, these scaling limits also hold for almost every choice of the environment, with homogenized coefficients that does not depend on the particular realization of the random environment.

P. Goncalves; M. D. Jara

2007-02-17T23:59:59.000Z

10

An almost sure invariance principle for random walks in a space-time random environment  

E-Print Network (OSTI)

We consider a discrete time random walk in a space-time i.i.d. random environment. We use a martingale approach to show that the walk is diffusive in almost every fixed environment. We improve on existing results by proving an invariance principle and considering environments with an annealed $L^2$ drift. We also state an a.s. invariance principle for random walks in general random environments whose hypothesis requires a subdiffusive bound on the variance of the quenched mean, under an ergodic invariant measure for the environment chain.

F. Rassoul-Agha; T. Seppalainen

2004-11-26T23:59:59.000Z

11

Randomly charged polymers in porous environment  

E-Print Network (OSTI)

We study the conformational properties of charged polymers in a solvent in the presence of structural obstacles correlated according to a power law \\sim x^{-a}. We work within the continuous representation of a model of linear chain considered as a random sequence of charges $q_i=\\pm q_0$. Such a model captures the properties of polyampholytes -- heteropolymers, comprising both positively and negatively charged monomers. We apply the direct polymer renormalization scheme and analyze the scaling behavior of charged polymers up to the first order of an $\\epsilon=6-d$, $\\delta=4-a$-expansion.

V. Blavatska; C. von Ferber

2013-07-10T23:59:59.000Z

12

A Bell pair in a generic random matrix environment  

E-Print Network (OSTI)

Two non-interacting qubits are coupled to an environment. Both coupling and environment are represented by random matrix ensembles. The initial state of the pair is a Bell state, though we also consider arbitrary pure states. Decoherence of the pair is evaluated analytically in terms of purity; Monte Carlo calculations confirm these results and also yield the concurrence of the pair. Entanglement within the pair accelerates decoherence. Numerics display the relation between concurrence and purity known for Werner states, allowing us to give a formula for concurrence decay.

Carlos Pineda; Thomas H. Seligman

2006-05-18T23:59:59.000Z

13

Sharp critical behavior for pinning model in random correlated environment  

E-Print Network (OSTI)

This article investigates the effect for random pinning models of long range power-law decaying correlations in the environment. For a particular type of environment based on a renewal construction, we are able to sharply describe the phase transition from the delocalized phase to the localized one, giving the critical exponent for the (quenched) free-energy, and proving that at the critical point the trajectories are fully delocalized. These results contrast with what happens both for the pure model (i.e. without disorder) and for the widely studied case of i.i.d. disorder, where the relevance or irrelevance of disorder on the critical properties is decided via the so-called Harris Criterion.

Quentin Berger; Hubert Lacoin

2011-04-26T23:59:59.000Z

14

vibration  

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

Electronics Testing for Electronics Testing for NANOMETER VIBRATION READING on The Next Linear Collider Project SUMMER INTERN PROJECT Rachel Lansom, Advisor: Josef Frisch, Collaborator: Sara Waugh INTRODUCTION SYNTHESIZER TEST AMPLIFIER TEST THE STATIC ACCELEROMETER TESTING THE CAPACITOR CONCLUSION ACKNOWLEDGEMENTS REFERENCES The NLC when it is completed will consist of two separate beam lines about ten kilometers in length. The beams from these beam lines are expected to converge to a diameter of only a few nanometers just prior to annihilation. One of many problems associated with such small beams is the slight movement of the earth (vibration). These vibrations cause the focusing magnets to move the beams off their collision paths. The earth itself is rather vibrationally quiet, but cars, construction, industries, and human

15

Aging and quenched localization for one-dimensional random walks in random environment in the sub-ballistic regime  

E-Print Network (OSTI)

We consider transient one-dimensional random walks in random environment with zero asymptotic speed. An aging phenomenon involving the generalized Arcsine law is proved using the localization of the walk at the foot of "valleys" of height $\\log t$. In the quenched setting, we also sharply estimate the distribution of the walk at time $t$.

Nathanaël Enriquez; Christophe Sabot; Olivier Zindy

2007-11-07T23:59:59.000Z

16

Mott law as lower bound for a random walk in a random environment  

E-Print Network (OSTI)

We consider a random walk on the support of a stationary simple point process on $R^d$, $d\\geq 2$ which satisfies a mixing condition w.r.t.the translations or has a strictly positive density uniformly on large enough cubes. Furthermore the point process is furnished with independent random bounded energy marks. The transition rates of the random walk decay exponentially in the jump distances and depend on the energies through a factor of the Boltzmann-type. This is an effective model for the phonon-induced hopping of electrons in disordered solids within the regime of strong Anderson localization. We show that the rescaled random walk converges to a Brownian motion whose diffusion coefficient is bounded below by Mott's law for the variable range hopping conductivity at zero frequency. The proof of the lower bound involves estimates for the supercritical regime of an associated site percolation problem.

A. Faggionato; H. Schulz-Baldes; D. Spehner

2004-07-26T23:59:59.000Z

17

Tracking random finite objects using 3D-LIDAR in marine environments  

E-Print Network (OSTI)

This paper presents a random finite set theoretic formulation for multi-object tracking as perceived by a 3D-LIDAR in a dynamic environment. It is mainly concerned with the joint detection and estimation of the unknown and ...

Lee, Kwang Wee

18

Energy harvesting of random wide-band vibrations with applications to an electro-magnetic rotational energy harvester  

E-Print Network (OSTI)

In general, vibration energy harvesting is the scavenging of ambient vibration by transduction of mechanical kinetic energy into electrical energy. Many mechanical or electro-mechanical systems produce mechanical vibrations. ...

Trimble, A. Zachary

2011-01-01T23:59:59.000Z

19

2.017J / 1.015J Design of Systems Operating in Random Environments, Spring 2006  

E-Print Network (OSTI)

This class covers the principles for optimal performance and survival of extreme events in a random environment; linear time invariant systems and Fourier transform; random processes, autocorrelation function, and power ...

Hover, Franz

20

Efficient and robust query processing in dynamic environments using random walk techniques  

Science Conference Proceedings (OSTI)

Many existing systems for sensor networks rely on state information stored in the nodes for proper operation (e.g., pointers to parent in a spanning tree, routing information, etc). In dynamic environments, such systems must adopt failure recovery mechanisms, ... Keywords: query processing, random walk, sensor networks

Chen Avin; Carlos Brito

2004-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Tracking random finite objects using 3D-LIDAR in marine environments  

Science Conference Proceedings (OSTI)

This paper presents a random finite set theoretic formulation for multi-object tracking as perceived by a 3D-LIDAR in a dynamic environment. It is mainly concerned with the joint detection and estimation of the unknown and time varying number of objects ... Keywords: PHD filter, RFS, tracking, velodyne

Kwang Wee Lee; Bharath Kalyan; Sardha Wijesoma; Martin Adams; Franz S. Hover; Nicholas M. Patrikalakis

2010-03-01T23:59:59.000Z

22

Vibration Reduction Technology for Directional Blasting Demolition of 210m Chimney in Complex Environment  

Science Conference Proceedings (OSTI)

This paper describes the successful experience of the directional control blasting demolition of 210m reinforced concrete chimney, and elucidates the determination of the project scheme, parameter design, electronic digital detonator detonating network ... Keywords: reinforced concrete chimney, directional blasting, electronic digital detonator, blasting vibration, vibration reduction technology

Shunxiang Xu, Dezhi Chen

2013-01-01T23:59:59.000Z

23

Downhole vibration sensing by vibration energy harvesting  

E-Print Network (OSTI)

This thesis outlines the design of a prototype electromagnetic induction vibration energy harvesting device for use in a downhole environment. First order models of the necessary components for a generic vibration energy ...

Trimble, A. Zachary

2007-01-01T23:59:59.000Z

24

Shock and vibration environments encountered during normal rail transportation of heavy cargo  

Science Conference Proceedings (OSTI)

This study was conducted to obtain vibration and superimposed shock data during normal rail shipment of heavy cargo. The data were obtained during a regularly scheduled rail shipment of a 45-tonne (50-ton) cargo which consisted of an empty spent-fuel container, its supporting structure, and associated hoisting devices. The shipment was made over rail lines which are operated by the Atchison, Topeka, and Santa Fe Railway Company between Denver, Colorado and Albuquerque, New Mexico. The instrumented rail car was equipped with 0.38-m (15-in.) hydraulic end-of-car coupling devices. The 99 percentile levels of vibration acceleration amplitudes and single degree-of-freedom superimposed shock response spectra for the longitudinal, transverse, and vertical axes are presented.

Magnuson, C.F.

1982-08-01T23:59:59.000Z

25

A random finite set based detection and tracking using 3D LIDAR in dynamic environments  

E-Print Network (OSTI)

In this paper we describe a fully integrated system for detecting and tracking pedestrians in a dynamic urban environment. The system can reliably detect and track pedestrians to a range of 100 m in highly cluttered ...

Kalyan, B.

26

Environment  

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

Environment Environment Our good neighbor pledge: to contribute to quality of life in Northern New Mexico through economic development, excellence in education, and active employee...

27

Environment  

Science Conference Proceedings (OSTI)

...O. Jonas, Corrosion of Steam Turbines, Corrosion: Environments and Industries, Vol 13C, ASM Handbook, ASM International, 2006, p 469â??476...

28

Environment  

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

Environment Environment Environment LANL's mission is to develop and apply science and technology to ensure the safety, security, and reliability of the U.S. nuclear deterrent; reduce global threats; and solve other emerging national security and energy challenges. Contact Operator Los Alamos National Laboratory (505) 667-5061 LANL has a strategy to clean up the past, control current operations, and move toward a sustainable future in which waste is minimized and other effects on the environment are reduced or eliminated. We work safely, securely, ethically, and in a manner that protects the environment We understand that the health and viability of the Laboratory depend in part on a record of environmental performance, building confidence of the public and our regulators. To gain the right to do what we do, we must work

29

Collective behavior in random interaction  

E-Print Network (OSTI)

Recent investigations have looked at the many-body spectra of random two-body interactions. In fermion systems, such as the interacting shell model, one finds pairing-like spectra, while in boson systems, such as IBM-1, one finds rotational and vibrational spectra. We discuss the search for random ensembles of fermion interactions that yield rotational and vibrational spectra, and in particular present results from a new ensemble, the ``random quadrupole-quadrupole ensemble''

Johnson, C W; Johnson, Calvin W.; Nam, Hai Ah

2006-01-01T23:59:59.000Z

30

Collective behavior in random interaction  

E-Print Network (OSTI)

Recent investigations have looked at the many-body spectra of random two-body interactions. In fermion systems, such as the interacting shell model, one finds pairing-like spectra, while in boson systems, such as IBM-1, one finds rotational and vibrational spectra. We discuss the search for random ensembles of fermion interactions that yield rotational and vibrational spectra, and in particular present results from a new ensemble, the ``random quadrupole-quadrupole ensemble''

Calvin W. Johnson; Hai Ah Nam

2006-01-30T23:59:59.000Z

31

Environment  

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

Environment Environment Environment Photo Gallery A repository for images showing environmental cleanup and protection efforts around the Lab. Click thumbnails to enlarge. Photos arranged by most recent first, horizontal formats before vertical. See Flickr for more sizes and details. Workers sample contents of LANL's Material Disposal Area B (MDA-B) before excavation Workers sample contents of LANL's Material Disposal Area B (MDA-B) before excavation Shipment #159 of TRU waste from LANL to WIPP, 2011 Shipment #159 of TRU waste from LANL to WIPP, 2011 Kathy Johns-Hughes oversees Los Alamos National Laboratory's TRU Waste Program Kathy Johns-Hughes oversees Los Alamos National Laboratory's TRU Waste Program Worker moves drums of transuranic (TRU) waste at a staging area

32

VIBRATION COMPACTION  

DOE Patents (OSTI)

A method of compacting a powder in a metal container is described including the steps of vibrating the container at above and below the resonant frequency and also sweeping the frequency of vibration across the resonant frequency several times thereby following the change in resonant frequency caused by compaction of the powder. (AEC)

Hauth, J.J.

1962-07-01T23:59:59.000Z

33

Environment  

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

73 Federal Register 73 Federal Register / Vol. 77, No. 48 / Monday, March 12, 2012 / Rules and Regulations adopted by voluntary consensus standards bodies. This rule does not use technical standards. Therefore, we did not consider the use of voluntary consensus standards. Environment We have analyzed this rule under Department of Homeland Security Management Directive 023-01 and Commandant Instruction M16475.lD, which guide the Coast Guard in complying with the National Environmental Policy Act of 1969 (NEPA) (42 U.S.C. 4321-4370f), and have concluded this action is one of a category of actions that do not individually or cumulatively have a significant effect on the human environment. This rule is categorically excluded, under figure 2-1, paragraph (34)(g), of the Instruction. This rule

34

Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density  

Science Conference Proceedings (OSTI)

We investigate a dilute Bose gas confined in a tight one-dimensional (1D) optical lattice plus a superimposed random potential at zero temperature. Accordingly, the ground-state energy, quantum depletion, and superfluid density are calculated. The presence of the lattice introduces a crossover to the quasi-two-dimensional (2D) regime, where we analyze asymptotically the 2D behavior of the system, particularly the effects of disorder. We thereby offer an analytical expression for the ground-state energy of a purely 2D Bose gas in a random potential. The obtained disorder-induced normal fluid density n{sub n} and quantum depletion n{sub d} both exhibit a characteristic 1/ln(1/n{sub 2D}a{sub 2D}{sup 2}) dependence. Their ratio n{sub n}/n{sub d} increases to 2 compared to the familiar 4/3 in lattice-free three-dimensional (3D) geometry, signifying a more pronounced contrast between superfluidity and Bose-Einstein condensation in low dimensions. The conditions for possible experimental realization of our scenario are also proposed.

Zhou Kezhao; Liang Zhaoxin; Zhang Zhidong [Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China); Hu Ying [Department of Physics, Centre for Nonlinear Studies, and Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Hong Kong Baptist University, Kowloon Tong (Hong Kong)

2010-10-15T23:59:59.000Z

35

Vibration test plan for a space station heat pipe subassembly  

SciTech Connect

This test plan describes the Sundstrand portion of task two of Los Alamos National Laboratory (LANL) contract 9-x6H-8102L-1. Sundstrand Energy Systems was awarded a contract to investigate the performance capabilities of a potassium liquid metal heat pipe as applied to the Organic Rankine Cycle (ORC) solar dynamic power system for the Space Station. The test objective is to expose the heat pipe subassembly to the random vibration environment which simulates the space shuttle launch condition. The results of the test will then be used to modify as required future designs of the heat pipe.

Parekh, M.B. [Sundstrand Energy Systems, Rockford, IL (United States)

1987-09-29T23:59:59.000Z

36

Transportation and handling environment  

SciTech Connect

The elements of the environment relating to transportation and handling include temperature, solar radiation, precipitation, humidity, pressure, shock, and vibration. While each of these deserves consideration, the latter two, shock and vibration, are perhaps the least understood. The report discusses all of these elements, but concentrates largely on shock and vibration. Emphasis is upon the necessity of understanding both the product and the environment. To that end, descriptions of the environment which have been derived statistically are discussed. Land, sea, and air transport are considered. Current knowledge of the handling environment is indicated.

Gens, M.B.

1972-09-01T23:59:59.000Z

37

System and method of active vibration control for an electro-mechanically cooled device  

SciTech Connect

A system and method of active vibration control of an electro-mechanically cooled device is disclosed. A cryogenic cooling system is located within an environment. The cooling system is characterized by a vibration transfer function, which requires vibration transfer function coefficients. A vibration controller generates the vibration transfer function coefficients in response to various triggering events. The environments may differ by mounting apparatus, by proximity to vibration generating devices, or by temperature. The triggering event may be powering on the cooling system, reaching an operating temperature, or a reset action. A counterbalance responds to a drive signal generated by the vibration controller, based on the vibration signal and the vibration transfer function, which adjusts vibrations. The method first places a cryogenic cooling system within a first environment and then generates a first set of vibration transfer function coefficients, for a vibration transfer function of the cooling system. Next, the cryogenic cooling system is placed within a second environment and a second set of vibration transfer function coefficients are generated. Then, a counterbalance is driven, based on the vibration transfer function, to reduce vibrations received by a vibration sensitive element.

Lavietes, Anthony D. (Hayward, CA); Mauger, Joseph (Livermore, CA); Anderson, Eric H. (Mountain View, CA)

2000-01-01T23:59:59.000Z

38

Force-limited vibration tests aplied to the FORTE` satellite  

SciTech Connect

A force limited random vibration test was conducted on a small satellite called FORTE{prime}. This type of vibration test reduces the over testing that can occur in a conventional vibration test. Two vibration specifications were used in the test: The conventional base acceleration specification, and an interface force specification. The vibration level of the shaker was controlled such that neither the table acceleration nor the force transmitted to the test item exceeded its specification. The effect of limiting the shake table vibration to the force specification was to reduce (or ``notch``) the shaker acceleration near some of the satellite`s resonance frequencies. This paper describes the force limited test conducted for the FORTE{prime} satellite. The satellite and its dynamic properties are discussed, and the concepts of force limiting theory are summarized. The hardware and setup of the test are then described, and the results of the force limited vibration test are discussed.

Stevens, R.R.; Butler, T.A.

1996-02-01T23:59:59.000Z

39

The Resonant Retina: Exploiting Vibration Noise to Optimally Detect Edges in an Image  

Science Conference Proceedings (OSTI)

Abstract¿We show that, far from being a drawback, the ubiquitous presence of random vibrations in vision systems operating from mobile devices can advantageously be used as a fundamental tool for edge detection. Directly inspired by biology, the concept ... Keywords: Edge detection, random vibration of the optical axis, microsaccades, threshold variance estimator, Fisher information, Cramer-Rao inequality, stochastic resonance.

Max-Olivier Hongler; Yuri L. de Meneses; Antoine Beyeler; Jacques Jacot

2003-09-01T23:59:59.000Z

40

A longitudinal study of vibration-based water flow sensing  

Science Conference Proceedings (OSTI)

We present a long-term and cross-sectional study of a vibration-based water flow rate monitoring system in practical environments and scenarios. In our earlier research, we proved that a water flow monitoring system with vibration sensors is feasible ... Keywords: Application of sensor networks, adaptive sensor calibration, nonintrusive and spatially distributed sensing, parameter estimation via numerical optimization

Younghun Kim; Heemin Park; Mani B. Srivastava

2012-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Vibrational Spectroscopy of Chromatographic Interfaces  

SciTech Connect

Chromatographic separations play a central role in DOE-supported fundamental research related to energy, biological systems, the environment, and nuclear science. The overall portfolio of research activities in the Separations and Analysis Program within the DOE Office of Basic Energy Sciences includes support for activities designed to develop a molecular-level understanding of the chemical processes that underlie separations for both large-scale and analytical-scale purposes. The research effort funded by this grant award was a continuation of DOE-supported research to develop vibrational spectroscopic methods to characterize the interfacial details of separations processes at a molecular level.

Jeanne E. Pemberton

2011-03-10T23:59:59.000Z

42

Vibrational Energy Search  

Science Conference Proceedings (OSTI)

... Search options (step 1) (Back to search). You may search for species based on vibrational energy values in two ways: ... All rights reserved. ...

2013-07-15T23:59:59.000Z

43

vibration_measurements  

Science Conference Proceedings (OSTI)

... information to be furnished by the customer to NIST in order for Vibration ... The magnitude of the latter is set in accordance with the calibration method ...

2013-07-24T23:59:59.000Z

44

Quantum Monte Carlo for vibrating molecules  

SciTech Connect

Quantum Monte Carlo (QMC) has successfully computed the total electronic energies of atoms and molecules. The main goal of this work is to use correlation function quantum Monte Carlo (CFQMC) to compute the vibrational state energies of molecules given a potential energy surface (PES). In CFQMC, an ensemble of random walkers simulate the diffusion and branching processes of the imaginary-time time dependent Schroedinger equation in order to evaluate the matrix elements. The program QMCVIB was written to perform multi-state VMC and CFQMC calculations and employed for several calculations of the H{sub 2}O and C{sub 3} vibrational states, using 7 PES`s, 3 trial wavefunction forms, two methods of non-linear basis function parameter optimization, and on both serial and parallel computers. In order to construct accurate trial wavefunctions different wavefunctions forms were required for H{sub 2}O and C{sub 3}. In order to construct accurate trial wavefunctions for C{sub 3}, the non-linear parameters were optimized with respect to the sum of the energies of several low-lying vibrational states. In order to stabilize the statistical error estimates for C{sub 3} the Monte Carlo data was collected into blocks. Accurate vibrational state energies were computed using both serial and parallel QMCVIB programs. Comparison of vibrational state energies computed from the three C{sub 3} PES`s suggested that a non-linear equilibrium geometry PES is the most accurate and that discrete potential representations may be used to conveniently determine vibrational state energies.

Brown, W.R. [Univ. of California, Berkeley, CA (United States). Chemistry Dept.]|[Lawrence Berkeley National Lab., CA (United States). Chemical Sciences Div.

1996-08-01T23:59:59.000Z

45

2008 Vibrational Spectroscopy  

SciTech Connect

The conference focuses on using vibrational spectroscopy to probe structure and dynamics of molecules in gases, liquids, and interfaces. The goal is to bring together a collection of researchers who share common interests and who will gain from discussing work at the forefront of several connected areas. The intent is to emphasize the insights and understanding that studies of vibrations provide about a variety of systems.

Philip J. Reid

2009-09-21T23:59:59.000Z

46

Fueled viking generator S/N 106 acceptance vibration test report  

SciTech Connect

The Viking Generator S/N 106 was vibrated to the Teledyne Isotope Flight Acceptance Schedule (Random Only) with no deviation from normal generator functional output. Radiographic analysis and power tests before and after the vibration test indicated no change in the condition of the generator. The work was conducted in the Alpha Fuels Environmental Test Facility at Mound Laboratory.

Anderson, C.; Brewer, C.O.; Abrahamson, S.G.

1976-06-08T23:59:59.000Z

47

Damping Ditch Effect Analysis of Blasting Vibration Based on Wavelet Transform  

Science Conference Proceedings (OSTI)

This paper researched the propagation laws of blasting seismic wave under the action of damping ditch, with the help of blasting vibration test and wavelet transform method. Blasting seismic wave is short-time non-stationary random signal. According ...

Zhiyang Chen; Xiang Fang; Weiping Zhang; Mingshou Zhong

2009-12-01T23:59:59.000Z

48

Unsteady momentum fluxes in two-phase flow and the vibration of nuclear reactor components  

E-Print Network (OSTI)

The steady and unsteady components of the momentum flux in a twophase flow have been measured at the exit of a vertical pipe. Measured momentum flux data has been machine processed by standard random vibration techniques ...

Yih, Tien Sieh

1968-01-01T23:59:59.000Z

49

vibrations.dvi  

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

VIBRATIONAL VIBRATIONAL MEASUREMENTS IN 3-ID-B J. Sutter 1 , E. Alp 1 , J. Barraza 2 , D. Shu 2 1 INTRODUCTION We have undertaken a series of vibrational measurements in hutch 3-ID-B. Our motivation was to compare two di erent methods of mounting an interferometer for e ectiveness in vibrational isolation and stability. In addition, we were able to compare the stability of our optical table with and without its eight large bolts inserted. 2 PROCEDURE We used two accelerometers to measure the amplitude of the vibrational acceleration as a function of frequency in steps of 0.0625 Hz from 1 to 25 Hz. The accelerations could then be transformed into displacement amplitudes by the simple harmonic equation of motion x = ,! 2 x, where x is the displacement and ! is the frequency times 2. The accelerometers had been calibrated before our experiment and were found to output a voltage of 7:44G V=g,

50

Vibrational Thermodynamics of Materials  

E-Print Network (OSTI)

Abstract. The literature on vibrational thermodynamics of materials is reviewed. The emphasis is on metals and alloys, especially on the progress over the last decade in understanding differences in the vibrational entropy of different alloy phases and phase transformations. Some results on carbides, nitrides, oxides, hydrides and lithium-storage materials are also covered. Principles of harmonic phonons in alloys are organized into thermodynamic models for unmixing and ordering transformations on an Ising lattice, and extended for non-harmonic potentials. Owing to the high accuracy required for the phonon frequencies, quantitative predictions of vibrational entropy with analytical models prove elusive. Accurate tools for such calculations or measurements were challenging for many years, but are more accessible today. Ab-initio methods for calculating phonons in solids are summarized. The experimental techniques of calorimetry, inelastic neutron scattering, and inelastic x-ray scattering are explained with enough detail to show the issues of using these methods for investigations of vibrational thermodynamics. The explanations extend to methods of data analysis that affect the accuracy of thermodynamic information. It is sometimes possible to identify the structural and chemical origins of the differences in vibrational entropy of materials, and the number of these assessments is growing. There has been

Brent Fultz

2009-01-01T23:59:59.000Z

51

Vibrations from underground blasting  

SciTech Connect

The Bureau of Mines has investigated vibration levels produced by blasting at four underground sites to establish how such factors as type of explosive, delay blasting, charge weight, and geology affect amplitudes of ground motion. A summary of the work is presented and the results of further analysis of the data are discussed. Square root scaling was found applicable to two of the underground sites and could be applied with minor error to all the sites. Comparison of empirical propagation equations in the different rock types indicates that although the site effect is apparent, the combined data may be used as a basis for engineering estimates of vibration amplitudes from subsurface blasting in many different rock types. Recommendations for predicting and minimizing vibration amplitudes from underground blasts are given.

Snodgrass, J.J.; Siskind, D.E.

1964-01-01T23:59:59.000Z

52

Externally tuned vibration absorber  

DOE Patents (OSTI)

A vibration absorber unit or units are mounted on the exterior housing of a hydraulic drive system of the type that is powered from a pressure wave generated, e.g., by a Stirling engine. The hydraulic drive system employs a piston which is hydraulically driven to oscillate in a direction perpendicular to the axis of the hydraulic drive system. The vibration absorbers each include a spring or other resilient member having one side affixed to the housing and another side to which an absorber mass is affixed. In a preferred embodiment, a pair of vibration absorbers is employed, each absorber being formed of a pair of leaf spring assemblies, between which the absorber mass is suspended.

Vincent, Ronald J. (Latham, NY)

1987-09-22T23:59:59.000Z

53

Vibrational and Electronic Energy Level Searches  

Science Conference Proceedings (OSTI)

... options based on vibrational and electronic energies are available: ... the tabulated vibrational and electronic energy level data ... All rights reserved. ...

2013-07-15T23:59:59.000Z

54

Vibration Harvesting using Electromagnetic Transduction  

E-Print Network (OSTI)

wide bandwidth piezoelectric energy harvesting,” Appliedtuning of piezoelectric vibration energy scavengingof electric energy harvesting using piezoelectric windmill,”

Waterbury, Andrew

2011-01-01T23:59:59.000Z

55

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

56

Quantum Random Number Generator  

Science Conference Proceedings (OSTI)

... trusted beacon of random numbers. You could conduct secure auctions, or certify randomized audits of data. One of the most ...

2013-08-30T23:59:59.000Z

57

Vibrational and Electronic Energy Levels  

Science Conference Proceedings (OSTI)

... for the ground-state vibrational fundamentals of larger ... and S. Iwata, Handbook of He I Photoelectron Spectra of Fundamental Organic Molecules ...

2013-07-15T23:59:59.000Z

58

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally...

59

Turbine blade vibration dampening  

DOE Patents (OSTI)

The present turbine wheel assembly increases component life and turbine engine longevity. The combination of the strap and the opening combined with the preestablished area of the outer surface of the opening and the preestablished area of the outer circumferential surface of the strap and the friction between the strap and the opening increases the life and longevity of the turbine wheel assembly. Furthermore, the mass ``M`` or combined mass ``CM`` of the strap or straps and the centrifugal force assist in controlling vibrations and damping characteristics. 5 figs.

Cornelius, C.C.; Pytanowski, G.P.; Vendituoli, J.S.

1997-07-08T23:59:59.000Z

60

Turbine blade vibration dampening  

DOE Patents (OSTI)

The present turbine wheel assembly increases component life and turbine engine longevity. The combination of the strap and the opening combined with the preestablished area of the outer surface of the opening and the preestablished area of the outer circumferential surface of the strap and the friction between the strap and the opening increases the life and longevity of the turbine wheel assembly. Furthermore, the mass "M" or combined mass "CM" of the strap or straps and the centrifugal force assist in controlling vibrations and damping characteristics.

Cornelius, Charles C. (San Diego, CA); Pytanowski, Gregory P. (San Diego, CA); Vendituoli, Jonathan S. (San Diego, CA)

1997-07-08T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Drillstring vibrations create crooked holes  

SciTech Connect

Boreholes in hard formations sometimes deviate when the drillstring runs rough or the kelly bounces severely. This article explains how drillstring vibrations produce crooked holes in hard formations. It shows how to reduce dog-leg severity through vibration control. Dog-legs are known to produce cyclic bending-type fatigue loads in drill pipe and collars. Longitudinal and torsional vibrational stresses are additive to rotational bending and further reduce the life of drillstring tubulars. Vibration-induced dog-legs are therefore more damaging to drillstrings than other dog-leg producing mechanisms because total cyclic fatigue loading is the combined effect of bending stress reversal due to rotation plus vibrational stress variations. The vibration-induced dog-leg concept is based on overall vibration response of drillstrings, resultant dynamic displacements of roller cone drill bits, and corresponding dynamic forces between bit and formation. The concept explains how dynamic forces generated by roller cone rock bits might produce helical bore holes in hard homogeneous formations. Dog-legs in hard formations may be due in part to drillstring vibrations. The wellbore deviation concept relates only to roller cone rock bits and is based on dynamically reorienting three-lobed formation pattern hammered out by bottomhole assembly resonance. Analytical studies are needed to determine the effect of bit force impact point location on chip formation and rock removal. Field studies of various bottom hole assemblies operating at critical rotary speeds coupled with directional surveys are needed to test the validity of this theory.

Dareing, D.W.

1984-01-01T23:59:59.000Z

62

Multiple direction vibration fixture - Energy Innovation Portal  

When the shaker motor vibrates along the centripetal force axis, the vibrations are imparted to a first side of the right angle fixture.

63

Quasi-random testing  

Science Conference Proceedings (OSTI)

Quasi-random sequences, also known as low-discrepancy or low-dispersion sequences, are sequences of points in an n-dimensional unit hypercube. These sequences have the property that points are spread more evenly throughout the cube than random point ... Keywords: adaptive random testing, automated testing, low-discrepancy sequence, quasi-random sequence, random testing

Tsong Yueh Chen; Robert Merkel

2005-11-01T23:59:59.000Z

64

Adaptive vibration control using synchronous demodulation with ...  

Adaptive vibration control using synchronous demodulation with machine tool controller motor commutation United States Patent

65

Vibration dampener for dampening vibration of a tubular member  

DOE Patents (OSTI)

Vibration dampener for dampening vibration of a tubular member, such as an instrumentation tube of the type found in nuclear reactor pressure vessels. The instrumentation tube is received in an outer tubular member, such as a guide thimble tube. The vibration dampener comprises an annular sleeve which is attachable to the inside surface of the guide thimble tube and which is sized to surround the instrumentation tube. Dimples are attached to the interior wall of the sleeve for radially supporting the instrumentation tube. The wall of the sleeve has a flexible spring member, which is formed from the wall, disposed opposite the dimples for biasing the instrumentation tube into abutment with the dimples. Flow-induced vibration of the instrumentation tube will cause it to move out of contact with the dimples and further engage the spring member, which will flex a predetermined amount and exert a reactive force against the instrumentation tube to restrain its movement. The amount by which the spring member will flex is less than the unrestrained amplitude of vibration of the instrumentation tube. The reactive force exerted against the instrumentation tube will be sufficient to return it to its original axial position within the thimble tube. In this manner, vibration of the instrumentation tube is dampened so that in-core physics measurements are accurate and so that the instrumentation tube will not wear against the inside surface of the guide thimble tube.

Obermeyer, Franklin D. (Pensacola, FL); Middlebrooks, Willis B. (Pensacola, FL); DeMario, Edmund E. (Columbia, SC)

1994-01-01T23:59:59.000Z

66

Vibration dampener for dampening vibration of a tubular member  

DOE Patents (OSTI)

Vibration dampener for dampening vibration of a tubular member, such as an instrumentation tube of the type found in nuclear reactor pressure vessels is disclosed. The instrumentation tube is received in an outer tubular member, such as a guide thimble tube. The vibration dampener comprises an annular sleeve which is attachable to the inside surface of the guide thimble tube and which is sized to surround the instrumentation tube. Dimples are attached to the interior wall of the sleeve for radially supporting the instrumentation tube. The wall of the sleeve has a flexible spring member, which is formed from the wall, disposed opposite the dimples for biasing the instrumentation tube into abutment with the dimples. Flow-induced vibration of the instrumentation tube will cause it to move out of contact with the dimples and further engage the spring member, which will flex a predetermined amount and exert a reactive force against the instrumentation tube to restrain its movement. The amount by which the spring member will flex is less than the unrestrained amplitude of vibration of the instrumentation tube. The reactive force exerted against the instrumentation tube will be sufficient to return it to its original axial position within the thimble tube. In this manner, vibration of the instrumentation tube is dampened so that in-core physics measurements are accurate and so that the instrumentation tube will not wear against the inside surface of the guide thimble tube. 14 figs.

Obermeyer, F.D.; Middlebrooks, W.B.; DeMario, E.E.

1994-10-18T23:59:59.000Z

67

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

68

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

69

What is a lattice vibration?  

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

What is a lattice vibration? The atoms in a crystal are not locked into a rigid pattern but can oscillate around their average position. When a whole group of them does this in a...

70

Vibration of Tethered Microstructure Profilers  

Science Conference Proceedings (OSTI)

Although loosely tethered turbulence profilers have many advantages, they are prone to resonant vibrations at frequencies in the dissipation range when they are falling rapidly or when the tether is strummed. Using the Advanced Microstructure ...

Jack B. Miller; M. C. Gregg; Vernon W. Miller; Gordon L. Welsh

1989-12-01T23:59:59.000Z

71

Compaction and mobility in randomly agitated granular assemblies  

E-Print Network (OSTI)

We study the compaction and mobility properties of a dense granular material under weak random vibration. By putting in direct contact millimetric glass beads with piezoelectric transducers we manage to inject energy to the system in a disordered manner with accelerations much smaller than gravity, resulting in a slow compaction dynamics and no convection. We characterize the mobility inside the medium by pulling through it an intruder grain at constant velocity. We present an extensive study of the relation between drag force and velocity for different vibration conditions and sizes of the intruder.

G. Caballero; J. Lanuza; E. Clement

2005-04-25T23:59:59.000Z

72

Community, Environment  

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

Environment community-environmentassetsimagesicon-community.jpg Community, Environment Our good neighbor pledge: to contribute to quality of life in Northern New Mexico...

73

Visualization of vibration experienced in offshore platforms  

E-Print Network (OSTI)

In this thesis, I design and evaluate methods to optimize the visualization of vortex-induced vibration (VIV) in marine risers. VIV is vibration experienced by marine risers in offshore drilling platforms due to ocean ...

Patrikalakis, Alexander Marinos Charles

2010-01-01T23:59:59.000Z

74

Gaussian random number generators  

Science Conference Proceedings (OSTI)

Rapid generation of high quality Gaussian random numbers is a key capability for simulations across a wide range of disciplines. Advances in computing have brought the power to conduct simulations with very large numbers of random numbers and with it, ... Keywords: Gaussian, Random numbers, normal, simulation

David B. Thomas; Wayne Luk; Philip H.W. Leong; John D. Villasenor

2007-11-01T23:59:59.000Z

75

The Nature of Vibrational Softening in ? - Uranium  

Science Conference Proceedings (OSTI)

... The Nature of Vibrational Softening in ? - Uranium. The standard textbook ... B / atom. All experiments used uranium powder. High ...

76

Steam Generator Vibration and Wear Protection  

Science Conference Proceedings (OSTI)

This project developed and validated a steam generator flow-induced tube vibration and wear prediction methodology.

1998-03-27T23:59:59.000Z

77

Vibrations, Quanta and Biology  

E-Print Network (OSTI)

Quantum biology is an emerging field of research that concerns itself with the experimental and theoretical exploration of non-trivial quantum phenomena in biological systems. In this tutorial overview we aim to bring out fundamental assumptions and questions in the field, identify basic design principles and develop a key underlying theme -- the dynamics of quantum dynamical networks in the presence of an environment and the fruitful interplay that the two may enter. At the hand of three biological phenomena whose understanding is held to require quantum mechanical processes, namely excitation and charge transfer in photosynthetic complexes, magneto-reception in birds and the olfactory sense, we demonstrate that this underlying theme encompasses them all, thus suggesting its wider relevance as an archetypical framework for quantum biology.

S. F. Huelga; M. B. Plenio

2013-06-27T23:59:59.000Z

78

Blasting Vibration Forecast Base on Neural Network  

Science Conference Proceedings (OSTI)

The influence of blasting vibration to surroundings around the blasting area can not be ignored, in order to guarantee the safety of surroundings around blasting area, blasting vibration forecasting model based on neural network is established by improved ... Keywords: Blasting vibration, Neural network, Forecast

Haiwang Ye; Fang Liu; Jian Chang; Lin Feng; Yang Wang; Peng Yao; Kai Wu

2010-10-01T23:59:59.000Z

79

Ground Vibration Measurements at LHC Point 4  

Science Conference Proceedings (OSTI)

Ground vibration was measured at Large Hadron Collider (LHC) Point 4 during the winter shutdown in February 2012. This report contains the results, including power and coherence spectra. We plan to collect and analyze vibration data from representative collider halls to inform specifications for future linear colliders, such as ILC and CLIC. We are especially interested in vibration correlations between final focus lens locations.

Bertsche, Kirk; /SLAC; Gaddi, Andrea; /CERN

2012-09-17T23:59:59.000Z

80

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Electron Trapping by Molecular Vibration Electron Trapping by Molecular Vibration Print Wednesday, 27 April 2005 00:00 In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

Note: This page contains sample records for the topic "random vibration environment" 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

Vibration and noise from blasting  

SciTech Connect

Adverse environmental effects from blasting continue to be a major problem for the mining industry, the public living near mining operations, and the governmental agencies responsible for setting environmental standards. The Bureau of Mines has established a comprehensive blasting research program dealing with the many technical aspects of generation and propagation of ground vibrations and airblast, structure response and damage, and proper instrumentation.

Siskind, D.E.

1982-01-01T23:59:59.000Z

82

Hydrogen rotation-vibration oscillator  

DOE Patents (OSTI)

A laser system is described wherein molecular species of hydrogen and hydrogen isotopes are induced to oscillate on rotational-vibrational levels by subjecting the hydrogen to a transverse beam of electrons of a narrowly defined energy between about 1 and 5 eV, thereby producing high intensity and high energy output. (Official Gazette)

Rhodes, C.K.

1974-01-29T23:59:59.000Z

83

Context: Environment  

Science Conference Proceedings (OSTI)

... Decision Tree for Global Environmental Impact Screening.. ... United Nations Environment Programme's Role in Eliminating Halon Dependency in ...

2011-11-16T23:59:59.000Z

84

Random multiparty entanglement distillation  

E-Print Network (OSTI)

We describe various results related to the random distillation of multiparty entangled states - that is, conversion of such states into entangled states shared between fewer parties, where those parties are not predetermined. In previous work [Phys. Rev. Lett. 98, 260501 (2007)] we showed that certain output states (namely Einstein-Podolsky-Rosen (EPR) pairs) could be reliably acquired from a prescribed initial multipartite state (namely the W state) via random distillation that could not be reliably created between predetermined parties. Here we provide a more rigorous definition of what constitutes ``advantageous'' random distillation. We show that random distillation is always advantageous for W-class three-qubit states (but only sometimes for Greenberger-Horne-Zeilinger (GHZ)-class states). We show that the general class of multiparty states known as symmetric Dicke states can be readily converted to many other states in the class via random distillation. Finally we show that random distillation is provab...

Fortescue, Ben

2007-01-01T23:59:59.000Z

85

Random coincidence of $2\  

E-Print Network (OSTI)

Two neutrino double $\\beta$ decay can create irremovable background even in high energy resolution detectors searching for neutrinoless double $\\beta$ decay due to random coincidence of $2\

D. M. Chernyak; F. A. Danevich; A. Giuliani; E. Olivieri; M. Tenconi; V. I. Tretyak

2013-01-17T23:59:59.000Z

86

Selling Random Energy  

E-Print Network (OSTI)

variability of wind and solar power production poses seriousof wind and solar power. They are essentially random – ais variability in wind an solar power production dealt with

Bitar, Eilyan Yamen

2011-01-01T23:59:59.000Z

87

Using linear congruential generators for parallel random number generation  

Science Conference Proceedings (OSTI)

Linear congruential random number generators are widely used in simulation and Monte Carlo calculations. Because they are very fast, and because they have minimal state space, they remain attractive for use in parallel computing environments. We discuss ...

M. J. Durst

1989-10-01T23:59:59.000Z

88

VIBRATION DAMPING AND SHOCK MOUNT  

DOE Patents (OSTI)

A shock absorbing mount in which vibrations are damped by an interference fit between relatively movable parts of the mount is described. A pair of generally cup-shaped parts or members have skirt portions disposed in an oppositely facing nesting relationship with the skirt of one member frictionally engaging the skirt of the other. The outermost skirt may be slotted to provide spring-like segments which embrace the inner skirt for effecting the interference fit. Belleville washers between the members provide yieldable support for a load carried by the mount. When a resonant frequency of vibration forces acting upon the moumt attains a certain level the kinetic energy of these forces is absorbed by sliding friction between the parts. (AEC)

Stevens, D.J.; Forman, G.W.

1963-12-10T23:59:59.000Z

89

Impugning Randomness, Convincingly  

Science Conference Proceedings (OSTI)

John organized a state lottery and his wife won the main prize. You may feel that the event of her winning wasn't particularly random, but how would you argue that in a fair court of law? Traditional probability theory does not even have the notion of ... Keywords: Cournot's Principle, definability, information complexity, randomness

Yuri Gurevich; Grant Olney Passmore

2012-04-01T23:59:59.000Z

90

Distance Expanding Random  

E-Print Network (OSTI)

In this manuscript we introduce measurable expanding random systems, develop the thermodynamical formalism and establish, in particular, exponential decay of correlations and analyticity of the expected pressure although the spectral gap property does not hold. This theory is then used to investigate fractal properties of conformal random systems. We prove a Bowen’s formula and develop the multifractal formalism of the Gibbs states. Depending on the behavior of the Birkhoff sums of the pressure function we get a natural classifications of the systems into two classes: quasi-deterministic systems which share many properties of deterministic ones and essential random systems which are rather generic and never bilipschitz equivalent to deterministic systems. We show in the essential case that the Hausdorff measure vanishes which refutes a conjecture of Bogenschütz and Ochs. We finally give applications of our results to various specific conformal random systems and positively answer a question of Brück and Büger concerning the Hausdorff dimension of random Julia sets.

Volker Mayer; Bart?omiej Skorulski; Mariusz Urba?ski

2011-01-01T23:59:59.000Z

91

User Environment  

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

User Environment Environment on Genepool When you log into the Genepool system you will land in your $HOME directory on NERSC's "global homes" file system. The global homes file system is mounted across all NERSC computation systems with the exception of PDSF. The $HOME directory has quota of 40GB and 1,000,000 inodes. To customize your environment, by setting environment variables or aliases, you will need to modify one of the "dot" files that NERSC has created for you. You may NOT modify the .bashrc or .cshrc files. These are set to read-only on NERSC systems and specify system specific customizations. Instead you should modify a file called .bashrc.ext or .cshrc.ext. Learn more about the global homes user environment. Important Environment Variables

92

Study on the Photogrammetric Application to the Fuel Cell Engine Vibration Testing  

Science Conference Proceedings (OSTI)

Owing to its energy-saving and environment-friendly features, the fuel cell car has become the future trend of vehicle development. To prolong the engine’s life span, the suspension of fuel cell engine needs to be appropriately designed, which ... Keywords: fuel cell engine, vibration testing, close-up photogrammetry, image processing

Chuqi Su; Xiang Lin

2009-10-01T23:59:59.000Z

93

Actively controlled vibration welding system and method  

DOE Patents (OSTI)

A vibration welding system includes a controller, welding horn, an active material element, and anvil assembly. The assembly may include an anvil body connected to a back plate and support member. The element, e.g., a piezoelectric stack or shape memory alloy, is positioned with respect to the assembly. The horn vibrates in a desirable first direction to form a weld on a work piece. The element controls any vibrations in a second direction by applying calibrated response to the anvil body in the second direction. A method for controlling undesirable vibrations in the system includes positioning the element with respect to the anvil assembly, connecting the anvil body to the support member through the back plate, vibrating the horn in a desirable first direction, and transmitting an input signal to the element to control vibration in an undesirable second direction.

Cai, Wayne W.; Kang, Bongsu; Tan, Chin-An

2013-04-02T23:59:59.000Z

94

Environment ref  

E-Print Network (OSTI)

Support to the identification of potential risks for the environment and human health arising from hydrocarbons operations involving hydraulic fracturing in Europe Report for

Issue Number C; Andrew Lelland

2012-01-01T23:59:59.000Z

95

High force vibration testing with wide frequency range  

DOE Patents (OSTI)

A shaker assembly for vibration testing includes first and second shakers, where the first shaker includes a piezo-electric material for generating vibration. A support structure permits a test object to be supported for vibration of the test object by both shakers. An input permits an external vibration controller to control vibration of the shakers.

Romero, Edward F.; Jepsen, Richard A.; Gregory, Danny Lynn

2013-04-02T23:59:59.000Z

96

Erratum: Experimental Vibrational Zero-Point Energies ...  

Science Conference Proceedings (OSTI)

Erratum: Experimental Vibrational Zero-Point Energies: Diatomic Molecules †J ... error in the calculated zero point energy ZPE for ... All rights reserved. ...

2013-04-16T23:59:59.000Z

97

Coal storage hopper with vibrating screen agitator  

DOE Patents (OSTI)

The present invention is directed to a vibrating screen agitator in a coal storage hopper for assuring the uniform feed of coal having sufficient moisture content to effect agglomeration and bridging thereof in the coal hopper from the latter onto a conveyor mechanism. The vibrating screen agitator is provided by a plurality of transversely oriented and vertically spaced apart screens in the storage hopper with a plurality of vertically oriented rods attached to the screens. The rods are vibrated to effect the vibration of the screens and the breaking up of agglomerates in the coal which might impede the uniform flow of the coal from the hopper onto a conveyer.

Daw, Charles S. (Knoxville, TN); Lackey, Mack E. (Oak Ridge, TN); Sy, Ronald L. (Clinton, TN)

1984-01-01T23:59:59.000Z

98

Vibration energy harvesting using piezoelectric materials.  

E-Print Network (OSTI)

??Harvesting environmental energy around a system provides a promising solution to implement self-powered electronic devices, which currently rely on batteries as power supply. Vibration energy… (more)

Tang, Lihua.

2012-01-01T23:59:59.000Z

99

Selling Random Energy  

E-Print Network (OSTI)

Selling Random Energy in a Two-Settlement System 3.1Wind Energy Aggregation and Profit Sharing 4.1 IntroductionPower Model . . . . . . . . . . . . . 5.3.2 Energy Storage

Bitar, Eilyan Yamen

2011-01-01T23:59:59.000Z

100

Random array grid collimator  

DOE Patents (OSTI)

A hexagonally shaped quasi-random no-two-holes touching grid collimator. The quasi-random array grid collimator eliminates contamination from small angle off-axis rays by using a no-two-holes-touching pattern which simultaneously provides for a self-supporting array increasng throughput by elimination of a substrate. The presentation invention also provides maximum throughput using hexagonally shaped holes in a hexagonal lattice pattern for diffraction limited applications. Mosaicking is also disclosed for reducing fabrication effort.

Fenimore, E.E.

1980-08-22T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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.


101

Random multiparty entanglement distillation  

E-Print Network (OSTI)

We describe various results related to the random distillation of multiparty entangled states - that is, conversion of such states into entangled states shared between fewer parties, where those parties are not predetermined. In previous work [Phys. Rev. Lett. 98, 260501 (2007)] we showed that certain output states (namely Einstein-Podolsky-Rosen (EPR) pairs) could be reliably acquired from a prescribed initial multipartite state (namely the W state) via random distillation that could not be reliably created between predetermined parties. Here we provide a more rigorous definition of what constitutes ``advantageous'' random distillation. We show that random distillation is always advantageous for W-class three-qubit states (but only sometimes for Greenberger-Horne-Zeilinger (GHZ)-class states). We show that the general class of multiparty states known as symmetric Dicke states can be readily converted to many other states in the class via random distillation. Finally we show that random distillation is provably not advantageous in the limit of multiple copies of pure states.

Ben Fortescue; Hoi-Kwong Lo

2007-09-25T23:59:59.000Z

102

DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM  

SciTech Connect

The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. Phase I of this program entails modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype. The project continues to advance, but is behind the revised (14-month) schedule. Tasks 1-3 (Modeling, Specification and Design) are all essentially complete. The test bench for the Test and Evaluation (Tasks 4 & 5) and the laboratory prototype were constructed by the end of the period. During assembly, however, several of the key subassemblies became galled together, and had to be cut apart. These parts are being remachined with harder surfaces to prevent recurrence of this problem. One key component, the MR damper mandrel, has been redesigned into a three-piece assembly which will facilitate assembly and reduce the cost of replacement of worn components. The remade parts will be delivered by April 19, and the prototype assembled. Testing will begin during the first week of May and is anticipated to be completed before the revised end date for Phase I, May 31, 2004.

Martin E. Cobern

2004-04-17T23:59:59.000Z

103

Blasting vibrations and their effects on structures  

SciTech Connect

Results of the Bureau of Mines 10-year program to study the problem of air blast and ground vibrations generated by blasting are presented. The program included an extensive field study of ground vibrations; a consideration of air blast effects; an evaluation of instrumentation to measure vibrations; establishment of damage criteria for residential structures; determination of blasting parameters which grossly affected vibrations; empirical safe blasting limits; and the problem of human response. While values of 2.0 in/sec particle velocity and 0.5 psi air blast overpressure are recommended as safe blasting limits not to be exceeded to preclude damage to residential structures, lower limits are suggested to minimize complaints. Millisecond-delay blasting is shown to reduce vibration levels as compared to instantaneous blasting, and electric cap delay blasts offer a slight reduction in vibration levels as compared to Primacord delay blasts. Vibration levels of different blasts may be compared at common scaled distances, where scaled distance is the distance divided by the square root of the maximum charge weight per delay. Geology, rock type, and direction affect vibration level within limits. Empirically, a safe blasting limit based on a scaled distance of 50 ft/lb/sup/sup 1///sub 2// may be used without instrumentation. However, a knowledge of the particle velocity propagation characteristics of a blasting site determined from instrumented blasts at that site are recommended to insure that the safe blasting limit of 2.0 in/sec is not exceeded.

Nicholls, H.R.; Johnson, C.F.; Duvall, W.I.

1971-01-01T23:59:59.000Z

104

Electrostatic Conversion for Vibration Energy Harvesting  

E-Print Network (OSTI)

This chapter focuses on vibration energy harvesting using electrostatic converters. It synthesizes the various works carried out on electrostatic devices, from concepts, models and up to prototypes, and covers both standard (electret-free) and electret-based electrostatic vibration energy harvesters (VEH).

Boisseau, S; Seddik, B Ahmed

2012-01-01T23:59:59.000Z

105

Vibrational analysis of graphene based nanostructures  

Science Conference Proceedings (OSTI)

This paper deals with the molecular mechanics simulations of graphene nanostructures and their vibration behavior for potential applications on nano-electronics and nanocomposites. The fundamental frequencies for CNTs range from 10 to 250GHz and 100 ... Keywords: Carbon nanotubes, Graphene nanosheets, Modal analysis, Molecular mechanics, Vibration

Antonio F. Ávila; Alexandre C. Eduardo; Almir S. Neto

2011-06-01T23:59:59.000Z

106

VIBRATIONS INDUCED BY THE FLOW OF MAGNET COOLING WATER  

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

Technology Division LS-82 MCTMV 1122 January 30, 1987 In September, 1986, the Mechanics and Vibrations Section of the MCT Division performed a vibration survey of the Phase...

107

Fermilab | Take Five for Goal Zero | Gloves | Anti-Vibration...  

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

Vibration Gloves Anti-Vibration Gloves Description Color Finish USes FNAL Stock Number Pigskin leather palm and fingers Low-profile closure with woven elastic cuff Neoprene knuckle...

108

The Vibrational Spectrometer at SNS | ORNL Neutron Sciences  

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

Vibrational Spectrometer at SNS VISION VISION is best thought of as the neutron analogue of an infrared-Raman spectrometer. It is optimized to characterize molecular vibrations in...

109

Passively damped vibration welding system and method  

DOE Patents (OSTI)

A vibration welding system includes a controller, welding horn, an anvil, and a passive damping mechanism (PDM). The controller generates an input signal having a calibrated frequency. The horn vibrates in a desirable first direction at the calibrated frequency in response to the input signal to form a weld in a work piece. The PDM is positioned with respect to the system, and substantially damps or attenuates vibration in an undesirable second direction. A method includes connecting the PDM having calibrated properties and a natural frequency to an anvil of an ultrasonic welding system. Then, an input signal is generated using a weld controller. The method includes vibrating a welding horn in a desirable direction in response to the input signal, and passively damping vibration in an undesirable direction using the PDM.

Tan, Chin-An; Kang, Bongsu; Cai, Wayne W.; Wu, Tao

2013-04-02T23:59:59.000Z

110

Reduced vibration motor winding arrangement  

DOE Patents (OSTI)

An individual phase winding arrangement having a sixty electrical degree phase belt width for use with a three phase motor armature includes a delta connected phase winding portion and a wye connected phase winding portion. Both the delta and wye connected phase winding portions have a thirty electrical degree phase belt width. The delta and wye connected phase winding portions are each formed from a preselected number of individual coils each formed, in turn, from an unequal number of electrical conductor turns in the approximate ratio of {radical}3. The individual coils of the delta and wye connected phase winding portions may either be connected in series or parallel. This arrangement provides an armature winding for a three phase motor which retains the benefits of the widely known and utilized thirty degree phase belt concept, including improved mmf waveform and fundamental distribution factor, with consequent reduced vibrations and improved efficiency. 4 figs.

Slavik, C.J.; Rhudy, R.G.; Bushman, R.E.

1997-11-11T23:59:59.000Z

111

Energy scavenging from environmental vibration.  

Science Conference Proceedings (OSTI)

The goal of this project is to develop an efficient energy scavenger for converting ambient low-frequency vibrations into electrical power. In order to achieve this a novel inertial micro power generator architecture has been developed that utilizes the bi-stable motion of a mechanical mass to convert a broad range of low-frequency (250 {micro}m) ambient vibrations into high-frequency electrical output energy. The generator incorporates a bi-stable mechanical structure to initiate high-frequency mechanical oscillations in an electromagnetic scavenger. This frequency up-conversion technique enhances the electromechanical coupling and increases the generated power. This architecture is called the Parametric Frequency Increased Generator (PFIG). Three generations of the device have been fabricated. It was first demonstrated using a larger bench-top prototype that had a functional volume of 3.7cm3. It generated a peak power of 558{micro}W and an average power of 39.5{micro}W at an input acceleration of 1g applied at 10 Hz. The performance of this device has still not been matched by any other reported work. It yielded the best power density and efficiency for any scavenger operating from low-frequency (piezoelectric version of the PFIG is currently being developed. This device clearly demonstrates one of the key features of the PFIG architecture, namely that it is suitable for MEMS integration, more so than resonant generators, by incorporating a brittle bulk piezoelectric ceramic. This is the first micro-scale piezoelectric generator capable of <10Hz operation. The fabricated device currently generates a peak power of 25.9{micro}W and an average power of 1.21{micro}W from an input acceleration of 9.8m/s{sup -} at 10Hz. The device operates over a frequency range of 23Hz. The internal volume of the generator is 1.2cm{sup 3}.

Galchev, Tzeno (University of Michigan); Apblett, Christopher Alan; Najafi, Khalil (University of Michigan)

2009-10-01T23:59:59.000Z

112

A discrete fractional random transform  

E-Print Network (OSTI)

We propose a discrete fractional random transform based on a generalization of the discrete fractional Fourier transform with an intrinsic randomness. Such discrete fractional random transform inheres excellent mathematical properties of the fractional Fourier transform along with some fantastic features of its own. As a primary application, the discrete fractional random transform has been used for image encryption and decryption.

Zhengjun Liu; Haifa Zhao; Shutian Liu

2006-05-20T23:59:59.000Z

113

Microelectromechanical power generator and vibration sensor  

DOE Patents (OSTI)

A microelectromechanical (MEM) apparatus is disclosed which can be used to generate electrical power in response to an external source of vibrations, or to sense the vibrations and generate an electrical output voltage in response thereto. The MEM apparatus utilizes a meandering electrical pickup located near a shuttle which holds a plurality of permanent magnets. Upon movement of the shuttle in response to vibrations coupled thereto, the permanent magnets move in a direction substantially parallel to the meandering electrical pickup, and this generates a voltage across the meandering electrical pickup. The MEM apparatus can be fabricated by LIGA or micromachining.

Roesler, Alexander W. (Tijeras, NM); Christenson, Todd R. (Albuquerque, NM)

2006-11-28T23:59:59.000Z

114

Anomalous heat-kernel decay for random walk among polynomial lower tail random conductances  

E-Print Network (OSTI)

We consider the nearest-neighbor simple random walk on $\\Z^{d}$, $d\\geq 4$, driven by a field of i.i.d. random nearest-neighbor conductances $\\omega_{xy}\\in[0,1]$. Our aim is to derive estimates of the heat-kernel decay in a case where ellipticity assumption is absent. We consider the case of independant conductances with polynomial tail near 0 and obtain for almost every environment an anomalous lower bound on the heat-kernel.

Boukhadra, Omar

2008-01-01T23:59:59.000Z

115

Blast-induced ground vibration prediction using support vector machine  

Science Conference Proceedings (OSTI)

Ground vibrations induced by blasting are one of the fundamental problems in the mining industry and may cause severe damage to structures and plants nearby. Therefore, a vibration control study plays an important role in the minimization of environmental ... Keywords: Blast vibration, Coefficient of determination, Conventional vibration predictor equations, Mean absolute error, Support vector machine

Manoj Khandelwal

2011-07-01T23:59:59.000Z

116

Simulation Research on Coupling Vibration of Tramcar-Track  

Science Conference Proceedings (OSTI)

Tramcar is important railway conveying equipment in acclivitous shaft of mine. During conveying, tramcar and track often vibrate because there are some excitements. Intensive vibration often causes run-away tramcar accident, and causes deformation of ... Keywords: tramcar, track, coupling vibration, vibration control, simulation

Wenhai He

2009-02-01T23:59:59.000Z

117

Vibrational States of the Hydrogen Molecular Ion  

Science Conference Proceedings (OSTI)

The energy levels of H2 + are computed for all vibrational quantum numbers and for rotational quantum numbers up to J=8. The accuracy of the energy of the uppermost levels is estimated to be better than 10?7.

H. Wind

1965-01-01T23:59:59.000Z

118

Control of human induced floor vibrations  

E-Print Network (OSTI)

With the growing demand for open, column-free floor spaces and the advances in material strength, floor vibration serviceability criterion has been of growing importance within the past 20-30 years. All floor systems are ...

Homen, Sean Manuel

2007-01-01T23:59:59.000Z

119

Electrostatic vibration-to-electric energy conversion  

E-Print Network (OSTI)

Ultra-Low-Power electronics can perform useful functions with power levels as low as 170 nW. This makes them amenable to powering from ambient sources such as vibration. In this case, they can become autonomous. Motivated ...

Mur Miranda, José Oscar, 1972-

2004-01-01T23:59:59.000Z

120

Vibrational Branching Ratios and Asymmetry Parameters in ...  

Science Conference Proceedings (OSTI)

... At energies 2 eV above the threshold, it was not ... into the regions of high vibrational energy, in contrast ... 1] A. Dalgarno and JL Fox, Unimolecular and ...

2010-08-19T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Harvesting energy from non-ideal vibrations  

E-Print Network (OSTI)

Energy harvesting has drawn significant interest for its potential to power autonomous low-power applications. Vibration energy harvesting is particularly well suited to industrial condition sensing, environmental monitoring ...

Chang, Samuel C

2013-01-01T23:59:59.000Z

122

Modelling the vibration of tyre sidewalls  

E-Print Network (OSTI)

, the exterior component represents an environmental pollutant, while its interior counterpart poses a problem for vehicle manufacturers. In both cases, accurate and effective models of the tyre’s vibration characteristics are needed to improve design... ), and rotational inertia effects appear to be minor at prac- tical vehicle speeds. Keywords: road noise, tyre vibration, tyre model 1. Introduction Noise generated by rolling vehicle tyres is a topic of significant, and growing, concern. From a societal viewpoint...

Graham, W. R.

2013-01-01T23:59:59.000Z

123

Reduced vibration motor winding arrangement  

DOE Patents (OSTI)

The present invention relates generally to an electric motor winding and, more particularly, to a three phase motor armature winding arrangement designed to reduce motor vibration and improve efficiency. An individual phase winding arrangement having a sixty electrical degree phase belt width for use with a three phase motor armature includes a delta connected phase winding portion and a wye connected phase winding portion. Both the delta and wye connected phase winding portions have a thirty electrical degree phase belt width. The delta and wye connected phase winding portions are each formed from a preselected number of individual coils each formed, in turn, from an unequal number of electrical conductor turns in the approximate ratio of {radical}3. The individual coils of the delta and wye connected phase winding portions may either be connected in series or parallel. This arrangement provides an armature winding for a three phase motor which retains the benefits of the widely known and utilized thirty degree phase belt concept, including improved mmf waveform and fundamental distribution factor.

Slavik, C.J.; Rhudy, R.G.; Bushman, R.E.

1995-12-31T23:59:59.000Z

124

Vibration control of a flexible arm for the ITER maintenance using unknown visual features from inside the vessel  

Science Conference Proceedings (OSTI)

In this paper we present a vibration control scheme for a long-reach inspection arm in an environment as constrained as a fusion reactor. The ultra-high vacuum, the high operating temperature, the significant residual magnetic field and the nuclear activation ...

Gregory Dubus; Olivier David; Yvan Measson

2009-10-01T23:59:59.000Z

125

Symmetrization Of Binary Random Variables  

E-Print Network (OSTI)

A random variable Y is called an independent symmetrizer of a given random variable X if (a) it is independent of X and (b) the distribution of X Y is symmetric about 0. In cases where the distribution of X is symmetric about its mean, it is easy to see that the constant random variable Y is a minimum-variance independent symmetrizer. Taking

Abram Kagan; Colin Mallows; Larry Shepp; Robert J. Vanderbei; Yehuda Vardi

1999-01-01T23:59:59.000Z

126

Polymers in anisotropic environment with extended defects  

E-Print Network (OSTI)

The conformational properties of flexible polymers in d dimensions in environments with extended defects are analyzed both analytically and numerically. We consider the case, when structural defects are correlated in \\varepsilon_d dimensions and randomly distributed in the remaining d-\\varepsilon_d. Within the lattice model of self-avoiding random walks (SAW), we apply the pruned enriched Rosenbluth method (PERM) and find the estimates for scaling exponents and universal shape parameters of polymers in environment with parallel rod-like defects (\\varepsilon_d=1). An analytical description of the model is developed within the des Cloizeaux direct polymer renormalization scheme.

V. Blavatska; K. Haydukivska

2012-12-17T23:59:59.000Z

127

Apparatus and methods for determining at least one characteristic of a proximate environment  

DOE Patents (OSTI)

Methods and an apparatus for determining at least one characteristic of an environment are disclosed. A vibrational energy may be imparted into an environment and a magnitude of damping of the vibrational energy may be measured and at least one characteristic of the environment may be determined. Particularly, a vibratory source may be operated and coupled to an environment. At least one characteristic of the environment may be determined based on a shift in at least one steady-state frequency of oscillation of the vibratory source. An apparatus may include at least one vibratory source and a structure for positioning the at least one vibratory source proximate to an environment. Further, the apparatus may include an analysis device for determining at least one characteristic of the environment based at least partially upon shift in a steady-state oscillation frequency of the vibratory source for the given impetus.

Novascone, Stephen R. (Idaho Falls, ID); West, Phillip B. (Idaho Falls, ID); Anderson, Michael J. (Troy, ID)

2008-04-15T23:59:59.000Z

128

Free randomness can be amplified  

E-Print Network (OSTI)

Are there fundamentally random processes in nature? Theoretical predictions, confirmed experimentally, such as the violation of Bell inequalities, point to an affirmative answer. However, these results are based on the assumption that measurement settings can be chosen freely at random, so assume the existence of perfectly free random processes from the outset. Here we consider a scenario in which this assumption is weakened and show that partially free random bits can be amplified to make arbitrarily free ones. More precisely, given a source of random bits whose correlation with other variables is below a certain threshold, we propose a procedure for generating fresh random bits that are virtually uncorrelated with all other variables. We also conjecture that such procedures exist for any non-trivial threshold. Our result is based solely on the no-signalling principle, which is necessary for the existence of free randomness.

Roger Colbeck; Renato Renner

2011-05-16T23:59:59.000Z

129

Vibrational energy transfer in a diesel engine  

Science Conference Proceedings (OSTI)

The paths of vibrational energy transfer in a diesel engine were investigated in order to obtain insight into ways of reducing this transfer to the exterior surfaces and thereby reduce the radiated noise. The engine was tested in a nonrunning condition with simulated internal forces in order to study the different transfer paths separately. Vibration response measurements were made of individual engine components and lumped?parameter models were developed to simulate this response. These models were then used to determine component design changes that would reduce the energy transfer. Two design changes were implemented in the engine and a reduction of the energy transfer was achieved as predicted.

R. G. DeJong; R. H. Lyon

1977-01-01T23:59:59.000Z

130

Characterisation of an Electrostatic Vibration Harvester  

E-Print Network (OSTI)

Harvesting energy from ambient vibration is proposed as an alternative to storage based power supplies for autonomous systems. The system presented converts the mechanical energy of a vibration into electrical energy by means of a variable capacitor, which is polarized by an electret. A lumped element model is used to study the generator and design a prototype. The device has been micromachined in silicon, based on a two-wafer process. The prototype was successfully tested, both using an external polarization source and an electret.

Sterken, T; Fiorini, P; Puers, R

2008-01-01T23:59:59.000Z

131

TEST SYSTEM FOR EVALUATING SPENT NUCLEAR FUEL BENDING STIFFNESS AND VIBRATION INTEGRITY  

SciTech Connect

Transportation packages for spent nuclear fuel (SNF) must meet safety requirements specified by federal regulations. For normal conditions of transport, vibration loads incident to transport must be considered. This is particularly relevant for high-burnup fuel (>45 GWd/MTU). As the burnup of the fuel increases, a number of changes occur that may affect the performance of the fuel and cladding in storage and during transportation. The mechanical properties of high-burnup de-fueled cladding have been previously studied by subjecting defueled cladding tubes to longitudinal (axial) tensile tests, ring-stretch tests, ring-compression tests, and biaxial tube burst tests. The objective of this study is to investigate the mechanical properties and behavior of both the cladding and the fuel in it under vibration/cyclic loads similar to the sustained vibration loads experienced during normal transport. The vibration loads to SNF rods during transportation can be characterized by dynamic, cyclic, bending loads. The transient vibration signals in a specified transport environment can be analyzed, and frequency, amplitude and phase components can be identified. The methodology being implemented is a novel approach to study the vibration integrity of actual SNF rod segments through testing and evaluating the fatigue performance of SNF rods at defined frequencies. Oak Ridge National Laboratory (ORNL) has developed a bending fatigue system to evaluate the response of the SNF rods to vibration loads. A three-point deflection measurement technique using linear variable differential transformers is used to characterize the bending rod curvature, and electromagnetic force linear motors are used as the driving system for mechanical loading. ORNL plans to use the test system in a hot cell for SNF vibration testing on high burnup, irradiated fuel to evaluate the pellet-clad interaction and bonding on the effective lifetime of fuel-clad structure bending fatigue performance. Technical challenges include pure bending implementation, remote installation and detachment of the SNF test specimen, test specimen deformation measurement, and identification of a driving system suitable for use in a hot cell. Surrogate test specimens have been used to calibrate the test setup and conduct systematic cyclic tests. The calibration and systematic cyclic tests have been used to identify test protocol issues prior to implementation in the hot cell. In addition, cyclic hardening in unidirectional bending and softening in reverse bending were observed in the surrogate test specimens. The interface bonding between the surrogate clad and pellets was found to impact the bending response of the surrogate rods; confirming this behavior in the actual spent fuel segments will be an important aspect of the hot cell test implementation,

Wang, Jy-An John [ORNL; Wang, Hong [ORNL; Bevard, Bruce Balkcom [ORNL; Howard, Rob L [ORNL; Flanagan, Michelle [U.S. Nuclear Regulatory Commission

2013-01-01T23:59:59.000Z

132

Measurement of sinusoidal vibration from motion blurred images  

Science Conference Proceedings (OSTI)

Previous vision-based methods usually measure vibration from large sequence of unblurred images recorded by high-speed video or stroboscopic photography. In this paper, we propose a novel method for sinusoidal vibration measurement based on motion blurred ... Keywords: Geometric moment, Motion blur, Motion blurred image, Vibration measurement

Shigang Wang; Baiqing Guan; Guobao Wang; Qian Li

2007-07-01T23:59:59.000Z

133

Testing Technology of Torsional Vibration Spring Static Stiffness  

Science Conference Proceedings (OSTI)

The principle and method of testing static stiffness of torsional vibration spring are put forward based on the structure of dual-mass flywheel with torsional vibration spring, and the test bench is designed for these. The testing data is collected by ... Keywords: LabVIEW, dual-mass flywheel, static stiffness, torsional vibration spring

Zhengfeng Jiang; Shaobo Xu; Lei Chen

2008-10-01T23:59:59.000Z

134

The Scalable Parallel Random Number Generators (SPRNG) ...  

Science Conference Proceedings (OSTI)

... Random Number Generators (SPRNG) Library is a widely used tool for random number generation on high-performance computing platforms. ...

2011-05-04T23:59:59.000Z

135

Downhole Vibration Monitoring and Control System  

SciTech Connect

The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. The key feature of this system is its use of a magnetorheological fluid (MRF) to allow the damping coefficient to be changed extensively, rapidly and reversibly without the use of mechanical valves, but only by the application of a current. Phase I of this program, which entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype, was completed on May 31, 2004. Much of the effort was devoted to the design and testing of the MRF damper, itself. The principal objectives of Phase II were: more extensive laboratory testing, including the evaluation of different feedback algorithms for control of the damper; design and manufacture of a field prototype system; and, testing of the field prototype in a drilling laboratory. Phase II concluded on January 31, 2006, and a final report was issued. Work on Phase III of the project began during the first quarter, 2006, with the objectives of building precommercial prototypes, testing them in a drilling laboratory and the field; developing and implementing a commercialization plan. All of these have been accomplished. The Downhole Vibration Monitoring & Control System (DVMCS) prototypes have been successfully proven in testing at the TerraTek drilling facility and at the Rocky Mountain Oilfield Test Center (RMOTC.) Based on the results of these tests, we have signed a definitive development and distribution agreement with Smith, and commercial deployment is underway. This current version of the DVMCS monitors and controls axial vibrations. Due to time and budget constraints of this program, it was not possible to complete a system that would also deal with lateral and torsional (stick-slip) vibrations as originally planned; however, this effort is continuing without DOE funding.

Martin E. Cobern

2007-09-30T23:59:59.000Z

136

PRIDE (Prediction In Dynamic Environments)  

Science Conference Proceedings (OSTI)

... coordination. USARSim is an open source simulation environment which provides realistic environments. The environments ...

2011-12-08T23:59:59.000Z

137

Water structure and vibrational properties in fibrous clays.  

DOE Green Energy (OSTI)

The behavior of water confined in porous materials influences macroscopic phenomena such as solute and water mobility, ion exchange, and adsorption. While the properties of bulk water are generally understood, that of nanoconfined water remains an active area of research. We used molecular simulation and inelastic neutron scattering (INS) to investigate the effect of local structure on the vibrational behavior of nanoconfined water. We focus specifically on the nanosized pores found in the 2:1 phyllosilicate clay minerals palygorskite and sepiolite. These are charge neutral, Mg-rich trioctahedral clays with idealized formulas Mg{sub 5}Si{sub 8}O{sub 20} (OH){sub 2} {center_dot} 8H{sub 2}O and Mg{sub 8}Si{sub 12}O{sub 30} (OH){sub 2} {center_dot} 12H{sub 2}O for palygorskite and sepiolite, respectively. The regular pattern of inverted phyllosilicate layers results in narrow channels with effective van der Waals dimensions of 3.61 {angstrom} x 8.59 {angstrom} (palygorskite) and 4.67 {angstrom} x 12.29 {angstrom} (sepiolite). These clay minerals represent a unique opportunity to study water adsorbed at 'inner edge' sites of uncoordinated Mg{sup 2+}. INS spectra taken at 90 K reveal a large shift in the water librational edge between palygorskite (358 cm{sup -1}) and sepiolite (536 cm{sup -1}), indicating less restricted water motion in the smaller-pore palygorskite. The librational edge of the reference sample (ice I{sub h}) is similar to sepiolite, which confirms the unique water behavior in palygorskite. We used both classical molecular dynamics (CMD) simulations and more rigorous density functional theory (DFT) calculations to investigate the hydrogen bonding environment and vibrational behavior of structural water, defined as those water molecules coordinated to Mg{sup 2+} along the pore walls. These waters remain coordinated throughout the 1-ns timescale of the CMD simulations, and the resulting vibrational spectra indicate a similar shift in the water librational edges seen in the INS spectra. The DFT-optimized structures indicate differences in hydrogen bonding between palygorskite and sepiolite, which could explain the librational shift. Corner-sharing silicate tetrahedra in palygorskite are tilted with respect to the crystallographic a-axis due to the induced strain of layer inversion. As a result, only two short (1.9 {angstrom}) hydrogen bonds form between each water and the framework. In contrast, the relatively unstrained sepiolite structure, each water forms three hydrogen bonds with the framework, and at greater distances (2.0 {angstrom} - 2.5 {angstrom}).

Ockwig, Nathan W.; Cygan, Randall Timothy; Greathouse, Jeffery A.

2010-06-01T23:59:59.000Z

138

Vibrational Infrared Lifetime of the Anesthetic nitrous oxide gas in solution  

E-Print Network (OSTI)

The lifetime of the asymmetric fundamental stretching 2218 cm$^{-1}$ vibration of the anesthetic gas nitrous oxide (N$_2$O) dissolved in octanol and olive oil is reported. These solvents are model systems commonly used to assess anesthetic potency. Picosecond time-scale molecular dynamics simulations have suggested that protein dynamics or membrane dynamics play a role in the molecular mechanism of anesthetic action. Ultrafast infrared spectroscopy with 100 fs time resolution is an ideal tool to probe dynamics of anesthetic molecules on such timescales. Pump-probe studies at the peak of the vibrational band yield a lifetime of $55 \\pm 1$ ps in olive oil and $52 \\pm 1 ps$ in octanol. The similarity of lifetimes suggests that energy relaxation of the anesthetic is determined primarily by the hydrophobic nature of the environment, consistent with models of anesthetic action. The results show that nitrous oxide is a good model system for probing anesthetic-solvent interactions using nonlinear infrared spectroscop...

Chieffo, Logan; Shattuck, Jeffrey; Hong, Mi K; Ziegler, Lawrence; Erramilli, Shyamsunder

2006-01-01T23:59:59.000Z

139

Study On The Self-Powered Active Vibration Control  

E-Print Network (OSTI)

A method of active vibration control using regenerated vibration energy, i.e., the self-powered active vibration control is proposed. In this system, vibration energy is regenerated with an electric generator ,which is called energy regenerative damper, and is stored in a condenser. An actuator attains active vibration control using the energy stored in the condenser. A variable resistance is used to control output force of the actuator. Since the damping coefficient of the energy regenerative damper is uncertain when it regenerates vibration energy, it is required for the controller to be robust to parameter uncertainty; H control method is applied to the system. Through experiments, the self-powered active control system is proved to have better isolation performance in comparison with that of a semi-active or a passive control system. INTRODUCTION Active vibration control has been applied to several systems. It has better isolation performance than a passive control system. Howe...

Yoshihiro Suda Institute; Yoshihiro Suda; Shigeyuki Nakadai; Kimihiko Nakano

1998-01-01T23:59:59.000Z

140

New developments in IR surface vibrational spectroscopy  

DOE Green Energy (OSTI)

Low frequency dynamics at surfaces, particularly in the region of the adsorbate-substrate vibrational modes is of fundamental importance in areas as varied as sliding friction, catalysis, corrosion and epitaxial growth. This paper reviews the new developments in low frequency Infrared Reflection Absorption Spectroscopy using synchrotron radiation as the source. Absolute changes induced in the far infrared for several adsorbate systems on Cu, including CO and H, are dominated by broadband reflectance changes and dipole forbidden vibrational modes which in some cases are an order of magnitude stronger than the dipole allowed modes. The experimental data can be explained by a theory developed by Persson, in which the dielectric response of the substrate is seen as playing a crucial role in the dynamics. In particular the relationships between the wavelength of the light, the penetration depth and the electron mean-free path, are critical.

Hirschmugl, C.J.; Lamont, C.L.A.; Williams, G.P. [Brookhaven National Lab., Upton, NY (United States). National Synchrotron Light Source

1995-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Transportation Shock and Vibration Literature Review  

SciTech Connect

This report fulfills the M4 milestone M4FT-13OR08220112, "Report Documenting Experimental Activities." The purpose of this report is to document the results of a literature review conducted of studies related to the vibration and shock associated with the normal conditions of transport for rail shipments of used nuclear fuel from commercial light-water reactors. As discussed in Adkins (2013), the objective of this report is to determine if adequate data exist that would enable the impacts of the shock and vibration associated with the normal conditions of transport on commercial light-water reactor used nuclear fuel shipped in current generation rail transportation casks to be realistically modeled.

Maheras, Steven J.; Lahti, Erik A.; Ross, Steven B.

2013-06-06T23:59:59.000Z

142

Vibrations in jammed solids: Beyond linear response  

E-Print Network (OSTI)

We propose a `phase diagram' for particulate systems that interact via purely repulsive contact forces, such as granular media and colloidal suspensions. We identify and characterize two distinct classes of behavior as a function of the input kinetic energy per degree of freedom $T_0$ and packing fraction deviation above and below jamming onset $\\Delta \\phi=\\phi - \\phi_J$ using numerical simulations of purely repulsive frictionless disks. Iso-coordinated solids (ICS) only occur above jamming for $\\Delta \\phi > \\Delta \\phi_c(T_0)$; they possess average coordination number equal to the isostatic value ($ = z_{\\rm iso}$) required for mechanically stable packings. ICS display harmonic vibrational response, where the density of vibrational modes from the Fourier transform of the velocity autocorrelation function is a set of sharp peaks at eigenfrequencies $\\omega_k^d$ of the dynamical matrix evaluated at $T_0=0$. Hypo-coordinated solids (HCS) occur both above and below jamming onset within the region defined by $\\Delta \\phi > \\Delta \\phi^*_-(T_0)$, $\\Delta \\phi \\Delta \\phi_{cb}(T_0)$. In this region, the network of interparticle contacts fluctuates with $ \\approx z_{\\rm iso}/2$, but cage-breaking particle rearrangements do not occur. The HCS vibrational response is nonharmonic, {\\it i.e} the density of vibrational modes $D(\\omega)$ is not a collection of sharp peaks at $\\omega_k^d$, and its precise form depends on the measurement method. For $\\Delta \\phi > \\Delta \\phi_{cb}(T_0)$ and $\\Delta \\phi < \\Delta \\phi^*_{-}(T_0)$, the system behaves as a hard-particle liquid.

Thibault Bertrand; Carl F. Schreck; Corey S. O'Hern; Mark D. Shattuck

2013-07-01T23:59:59.000Z

143

The High Level Vibration Test Program  

SciTech Connect

As part of cooperative agreements between the United States and Japan, tests have been performed on the seismic vibration table at the Tadotsu Engineering Laboratory of Nuclear Power Engineering Test Center (NUPEC) in Japan. The objective of the test program was to use the NUPEC vibration table to drive large diameter nuclear power piping to substantial plastic strain with an earthquake excitation and to compare the results with state-of-the-art analysis of the problem. The test model was designed by modifying the 1/2.5 scale model of the PWR primary coolant loop. Elastic and inelastic seismic response behavior of the test model was measured in a number of test runs with an increasing excitation input level up to the limit of the vibration table. In the maximum input condition, large dynamic plastic strains were obtained in the piping. Crack initiation was detected following the second maximum excitation run. The test model was subjected to a maximum acceleration well beyond what nuclear power plants are designed to withstand. This paper describes the overall plan, input motion development, test procedure, test results and comparisons with pre-test analysis. 4 refs., 16 figs., 2 tabs.

Hofmayer, C.H.; Curreri, J.R.; Park, Y.J.; Kato, W.Y. (Brookhaven National Lab., Upton, NY (USA)); Kawakami, S. (Nuclear Power Engineering Test Center, Tokyo (Japan))

1989-01-01T23:59:59.000Z

144

Bubble oscillations and motion under vibration  

E-Print Network (OSTI)

Bubbles under vibration can behave in unusual ways, e.g., moving downward against the force of buoyancy. While the bubble downward motion due to the Bjerknes force is well known at acoustic frequencies close to the bubble resonant frequency, these experiments demonstrate that these effects can be observed at relatively low frequencies as well. Experiments were performed in a thin, quasi-two-dimensional rectangular acrylic box partially filled with 20-cSt PDMS silicone oil with overlying ambient air. The apparatus was subjected to sinusoidal axial vibration that produced breakup of the gas-liquid free surface, producing liquid jets into the air, droplets pinching off from these jets, gas cavities in the liquid from impacts of these droplets, and bubble transport below the interface. Vibration conditions for the attached videos are 280 Hz frequency, 15 g acceleration, and 94 micron peak-to-peak displacement. Behaviors shown in the videos include the following. 1. Free surface breakup into jets and droplets, and...

O'Hern, Tim; Torczynski, John

2011-01-01T23:59:59.000Z

145

Coherent instabilities in random lasers  

SciTech Connect

A numerical study is presented of random lasers as a function of the pumping rate above the threshold for lasing. Depending on the leakiness of the system resonances, which is typically larger in random lasers compared to conventional lasers, we observe that the stationary lasing regime becomes unstable above a second threshold. Coherent instabilities are observed as self pulsation at a single frequency of the output intensity, population inversion, as well as the atomic polarization. We find these Rabi oscillations have the same frequency everywhere in the random laser despite the fact that the field intensity strongly depends on the spatial location.

Andreasen, Jonathan; Sebbah, Patrick; Vanneste, Christian [Laboratoire de Physique de la Matiere Condensee, CNRS UMR 6622, Universite de Nice-Sophia Antipolis, Parc Valrose, F-06108, Nice Cedex 02 (France)

2011-08-15T23:59:59.000Z

146

Characterization of the Virgo Seismic Environment  

E-Print Network (OSTI)

The Virgo gravitational wave detector is an interferometer (ITF) with 3km arms located in Pisa, Italy. From July to October 2010, Virgo performed its third science run (VSR3) in coincidence with the LIGO detectors. Despite several techniques adopted to isolate the interferometer from the environment, seismic noise remains an important issue for Virgo. Vibrations produced by the detector infrastructure (such as air conditioning units, water chillers/heaters, pumps) are found to affect Virgo's sensitivity, with the main coupling mechanisms being through beam jitter and scattered light processes. The Advanced Virgo (AdV) design seeks to reduce ITF couplings to environmental noise by having most vibration-sensitive components suspended and in-vacuum, as well as muffle and relocate loud machines. During the months of June and July 2010, a Guralp-3TD seismometer was stationed at various locations around the Virgo site hosting major infrastructure machines. Seismic data were examined using spectral and coherence analysis with seismic probes close to the detector. The primary aim of this study was to identify noisy machines which seismically affect the ITF environment and thus require mitigation attention. Analyzed machines are located at various distances from the experimental halls, ranging from 10m to 100m. An attempt is made to measure the attenuation of emitted noise at the ITF and correlate it to the distance from the source and to seismic attenuation models in soil.

The Virgo Collaboration; T. Accadia; F. Acernese; P. Astone; G. Ballardin; F. Barone; M. Barsuglia; A. Basti; Th. S. Bauer; M. Bebronne; M. G. Beker; A. Belletoile; M. Bitossi; M. A. Bizouard; M. Blom; F. Bondu; L. Bonelli; R. Bonnand; V. Boschi; L. Bosi; B. Bouhou; S. Braccini; C. Bradaschia; M. Branchesi; T. Briant; A. Brillet; V. Brisson; T. Bulik; H. J. Bulten; D. Buskulic; C. Buy; G. Cagnoli; E. Calloni; B. Canuel; F. Carbognani; F. Cavalier; R. Cavalieri; G. Cella; E. Cesarini; O. Chaibi; E. Chassande-Mottin; A. Chincarini; A. Chiummo; F. Cleva; E. Coccia; P. -F. Cohadon; C. N. Colacino; J. Colas; A. Colla; M. Colombini; A. Conte; M. Coughlin; J. -P. Coulon; E. Cuoco; S. DAntonio; V. Dattilo; M. Davier; R. Day; R. De Rosa; G. Debreczeni; W. Del Pozzo; M. del Prete; L. Di Fiore; A. Di Lieto; M. Di Paolo Emilio; A. Di Virgilio; A. Dietz; M. Drago; G. Endroczi; V. Fafone; I. Ferrante; F. Fidecaro; I. Fiori; R. Flaminio; L. A. Forte; J. -D. Fournier; J. Franc; S. Frasca; F. Frasconi; M. Galimberti; L. Gammaitoni; F. Garufi; M. E. Gaspar; G. Gemme; E. Genin; A. Gennai; A. Giazotto; R. Gouaty; M. Granata; C. Greverie; G. M. Guidi; J. -F. Hayau; A. Heidmann; H. Heitmann; P. Hello; P. Jaranowski; I. Kowalska; A. Krolak; N. Leroy; N. Letendre; T. G. F. Li; N. Liguori; M. Lorenzini; V. Loriette; G. Losurdo; E. Majorana; I. Maksimovic; N. Man; M. Mantovani; F. Marchesoni; F. Marion; J. Marque; F. Martelli; A. Masserot; C. Michel; L. Milano; Y. Minenkov; M. Mohan; N. Morgado; A. Morgia; S. Mosca; B. Mours; L. Naticchioni; F. Nocera; G. Pagliaroli; L. Palladino; C. Palomba; F. Paoletti; M. Parisi; A. Pasqualetti; R. Passaquieti; D. Passuello; G. Persichetti; F. Piergiovanni; M. Pietka; L. Pinard; R. Poggiani; M. Prato; G. A. Prodi; M. Punturo; P. Puppo; D. S. Rabeling; I. Racz; P. Rapagnani; V. Re; T. Regimbau; F. Ricci; F. Robinet; A. Rocchi; L. Rolland; R. Romano; D. Rosinska; P. Ruggi; B. Sassolas; D. Sentenac; L. Sperandio; R. Sturani; B. Swinkels; M. Tacca; L. Taffarello; A. Toncelli; M. Tonelli; O. Torre; E. Tournefier; F. Travasso; G. Vajente; J. F. J. van den Brand; C. Van Den Broeck; S. van der Putten; M. Vasuth; M. Vavoulidis; G. Vedovato; D. Verkindt; F. Vetrano; A. Vicere; J. -Y. Vinet; S. Vitale; H. Vocca; R. L. Ward; M. Was; M. Yvert; A. Zadrozny; J. -P. Zendri

2011-08-08T23:59:59.000Z

147

BENEFITS OF VIBRATION ANALYSIS FOR DEVELOPMENT OF EQUIPMENT IN HLW TANKS - 12341  

Science Conference Proceedings (OSTI)

Vibration analyses of equipment intended for use in the Savannah River Site (SRS) radioactive liquid waste storage tanks are performed during pre-deployment testing and has been demonstrated to be effective in reducing the life-cycle costs of the equipment. Benefits of using vibration analysis to identify rotating machinery problems prior to deployment in radioactive service will be presented in this paper. Problems encountered at SRS and actions to correct or lessen the severity of the problem are discussed. In short, multi-million dollar cost saving have been realized at SRS as a direct result of vibration analysis on existing equipment. Vibration analysis of equipment prior to installation can potentially reduce inservice failures, and increases reliability. High-level radioactive waste is currently stored in underground carbon steel waste tanks at the United States Department of Energy (DOE) Savannah River Site and at the Hanford Site, WA. Various types of rotating machinery (pumps and separations equipment) are used to manage and retrieve the tank contents. Installation, maintenance, and repair of these pumps and other equipment are expensive. In fact, costs to remove and replace a single pump can be as high as a half million dollars due to requirements for radioactive containment. Problems that lead to in-service maintenance and/or equipment replacement can quickly exceed the initial investment, increase radiological exposure, generate additional waste, and risk contamination of personnel and the work environment. Several different types of equipment are considered in this paper, but pumps provide an initial example for the use of vibration analysis. Long-shaft (45 foot long) and short-shaft (5-10 feet long) equipment arrangements are used for 25-350 horsepower slurry mixing and transfer pumps in the SRS HLW tanks. Each pump has a unique design, operating characteristics and associated costs, sometimes exceeding a million dollars. Vibration data are routinely collected during pre-installation tests and screened for: Critical speeds or resonance, Imbalance of rotating parts, Shaft misalignment, Fluid whirl or lubrication break down, Bearing damages, and Other component abnormalities. Examples of previous changes in operating parameters and fabrication tolerances and extension of equipment life resulting from the SRS vibration analysis program include: (1) Limiting operational speeds for some pumps to extend service life without design or part changes; (2) Modifying manufacturing methods (tightening tolerances) for impellers on slurry mixing pumps based on vibration data that indicated hydraulic imbalance; (3) Identifying rolling element mounting defects and replacing those components in pump seals before installation; and (4) Identifying the need for bearing design modification for SRS long-shaft mixing pump designs to eliminate fluid whirl and critical speeds which significantly increased the equipment service life. In addition, vibration analyses and related analyses have been used during new equipment scale-up tests to identify the need for design improvements for full-scale operation / deployment of the equipment in the full size tanks. For example, vibration analyses were recently included in the rotary micro-filtration scale-up test program at SRNL.

Stefanko, D.; Herbert, J.

2012-01-10T23:59:59.000Z

148

On Randomness in Quantum Mechanics  

E-Print Network (OSTI)

The quantum mechanical probability densities are compared with the probability densities treated by the theory of random variables. The relevance of their difference for the interpretation of quantum mechanics is commented.

Alberto C. de la Torre

2007-07-19T23:59:59.000Z

149

Random Distances Associated with Rhombuses  

E-Print Network (OSTI)

Parallelograms are one of the basic building blocks in two-dimensional tiling. They have important applications in a wide variety of science and engineering fields, such as wireless communication networks, urban transportation, operations research, etc. Different from rectangles and squares, the coordinates of a random point in parallelograms are no longer independent. As a case study of parallelograms, the explicit probability density functions of the random Euclidean distances associated with rhombuses are given in this report, when both endpoints are randomly distributed in 1) the same rhombus, 2) two parallel rhombuses sharing a side, and 3) two rhombuses having a common diagonal, respectively. The accuracy of the distance distribution functions is verified by simulation, and the correctness is validated by a recursion and a probabilistic sum. The first two statistical moments of the random distances, and the polynomial fit of the density functions are also given in this report for practical uses.

Yanyan Zhuang; Jianping Pan

2011-06-07T23:59:59.000Z

150

Argonne CNM Highlight: Damping of acoustic vibrations in gold nanoparticles  

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

Damping of acoustic vibrations in gold nanoparticles Damping of acoustic vibrations in gold nanoparticles Nanopatterning of STO Vibrations in nanostructures offer applications in molecular-scale biological sensing and ultrasensitive mass detection. To approach single-atom sensing, it is necessary to reduce the dimensions of the structures to the nanometer scale while preserving long-lived vibrations. This requires an understanding of how vibrations in nanoscale objects are damped - or lose their energy to the fluid surroundings and within themselves. Researchers have used fast laser pulses to produce and probe high-frequency vibrations in metal nanoparticles. However, significant variations in particle dimensions complicate measurements. By studying bipyramid-shaped gold nanoparticles with highly uniform sizes

151

Algorithmic randomness, quantum physics, and incompleteness  

Science Conference Proceedings (OSTI)

Is randomness in quantum mechanics “algorithmically random”? Is there any relation between Heisenberg's uncertainty relation and Gödel's incompleteness? Can quantum randomness be used to trespass the Turing's barrier? Can ...

Cristian S. Calude

2004-09-01T23:59:59.000Z

152

Vibration Monitoring and Analysis Program Development: Interim Guideline  

Science Conference Proceedings (OSTI)

This report has been prepared by an EPRI team and will serve as an interim guideline to assist the member utilities in the further improvement of maintenance processes by presenting, in detail, the key elements that should be included in a well-organized vibration monitoring and analysis program, as well as conducting comprehensive vibration program evaluations. This report uses the EPRI Monitoring and Diagnostics Center's "Spider Chart" approach to depict graphic representation of the vibration monitori...

2004-12-22T23:59:59.000Z

153

Vibrated Bulk Density (VBD) of Calcined Petroleum Coke and ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Vibrated bulk density (VBD) is a quantitative measurement used in the aluminum industry to evaluate the density of calcined petroleum coke.

154

Vibrated Bulk Density (VBD) of Calcined Petroleum Coke and ...  

Science Conference Proceedings (OSTI)

Presentation Title, Vibrated Bulk Density (VBD) of Calcined Petroleum Coke and Implications of Changes in the ASTM Method D4292. Author(s), Bill Spencer, ...

155

The Nature of Vibrational Softening in ? - Uranium Figure 1  

Science Conference Proceedings (OSTI)

... Back to The Nature of Vibrational Softening in ? - Uranium. Last modified 31-May-2002 by website owner: NCNR (attn: Bill Kamitakahara).

156

The Nature of Vibrational Softening in ? - Uranium -- Figure 2  

Science Conference Proceedings (OSTI)

... Back to The Nature of Vibrational Softening in ? - Uranium. Last modified 31-May-2002 by website owner: NCNR (attn: Bill Kamitakahara).

157

NIST Vibrational and electronic energy levels of polyatomic ...  

Science Conference Proceedings (OSTI)

... The types of measurement surveyed include spectrometer and laser-based ... ground-state vibrational fundamentals, the electronic energy levels, and ...

2010-10-08T23:59:59.000Z

158

Effect of mechanical vibrations on light emitting diode luminaires.  

E-Print Network (OSTI)

??In this work, a LED and two types of Compact fluorescent lamps were investigated for the intensity variation due to mechanical vibrations in the range… (more)

Paladugu, Jayalakshmi

2009-01-01T23:59:59.000Z

159

Coal storage hopper with vibrating-screen agitator  

DOE Patents (OSTI)

The present invention is directed to a vibrating screen agitator in a coal storage hopper for assuring the uniform feed of coal having sufficient moisture content to effect agglomeration and bridging thereof in the coal hopper from the latter onto a conveyer mechanism. The vibrating scrren agitator is provided by a plurality of transversely oriented and vertically spaced apart screens in the storage hopper with a plurality of vertically oriented rods attached to the screens. The rods are vibrated to effect the vibration of the screens and the breaking up of agglomerates in the coal which might impede the uniform flow of the coal from the hopper onto a conveyer.

Daw, C.S.; Lackey, M.E.; Sy, R.L.

1982-04-27T23:59:59.000Z

160

Performance Analysis of Tube-Fin Heat Exchanger under Vibration.  

E-Print Network (OSTI)

??The effects of vibration on the airside heat transfer and pressure drop characteristics are experimented and analyzed. The experiment is conducted on a flat tube… (more)

Kannan, Jayaprakash

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Discrete Element Method Applied to the Vibration Process of Coke ...  

Science Conference Proceedings (OSTI)

In the present work, effects of particle shape and size distribution on vibrated bulk density (VBD) of dry coke samples have been investigated. Discrete Element ...

162

Eddy-current system for the vibration-testing of blades  

SciTech Connect

This invention is an improved system for the vibration-testing of cantilevered non-ferrous articles by inducing eddy currents therein. The principal advantage of the system is that relatively little heat is generated in the article being vibrated. Thus, a more accurate measurement of the fatigue characteristics of the article is obtained. Furthermore, the generation of relatively little heat in the blade permits tests to be conducted in low-pressure atmospheres simulating certain actual processes environments. Heat-generation in the vibrated article is minimized by utilizing eddy currents which are generated by an electromagnet whose magnetic field varies but does not change polarity. The typical winding for the electromagnet is excited with pulsating d.c. That is, the winding is alternately charged by connecting it across a d.c. power supply and then discharged by connecting it across a circuit for receiving current generated in the winding by self-induction. Preferably, the discharge circuit is designed so that the waveform of the discharging current approximates that of the charging current.

Jacobs, Martin E. (Chillicothe, OH)

1977-01-01T23:59:59.000Z

163

Energy and Environment Division  

Science Conference Proceedings (OSTI)

Energy and Environment Division. ... Selected Publications. Measurement Science Roadmap for Net-Zero Energy Buildings. ...

2013-03-13T23:59:59.000Z

164

Harsh environments electronics : downhole applications.  

Science Conference Proceedings (OSTI)

The development and operational sustainment of renewable (geothermal) and non-renewable (fossil fuel) energy resources will be accompanied by increasingly higher costs factors: exploration and site preparation, operational maintenance and repair. Increased government oversight in the wake of the Gulf oil spill will only add to the cost burden. It is important to understand that downhole conditions are not just about elevated temperatures. It is often construed that military electronics are exposed to the upper limit in terms of extreme service environments. Probably the harshest of all service conditions for electronics and electrical equipment are those in oil, gas, and geothermal wells. From the technology perspective, advanced materials, sensors, and microelectronics devices are benefificial to the exploration and sustainment of energy resources, especially in terms of lower costs. Besides the need for the science that creates these breakthroughs - there is also a need for sustained engineering development and testing. Downhole oil, gas, and geothermal well applications can have a wide range of environments and reliability requirements: Temperature, Pressure, Vibration, Corrosion, and Service duration. All too frequently, these conditions are not well-defifined because the application is labeled as 'high temperature'. This ambiguity is problematic when the investigation turns to new approaches for electronic packaging solutions. The objective is to develop harsh environment, electronic packaging that meets customer requirements of cost, performance, and reliability. There are a number of challenges: (1) Materials sets - solder alloys, substrate materials; (2) Manufacturing process - low to middle volumes, low defect counts, new equipment technologies; and (3) Reliability testing - requirements documents, test methods and modeling, relevant standards documents. The cost to develop and sustain renewable and non-renewable energy resources will continue to escalate within the industry. Downhole electronics can provide a very cost-effective approach for well exploration and sustainment (data logging). However, the harsh environments are a 'game-changer' in terms defining materials, assembly processes and the long-term reliability of downhole electronic systems. The system-level approach will enable the integration of each of these contributors - materials, processes, and reliability - in order to deliver cost-effective electronics that meet customer requirements.

Vianco, Paul Thomas

2011-03-01T23:59:59.000Z

165

Positional Games on Random Graphs  

E-Print Network (OSTI)

We introduce and study Maker/Breaker-type positional games on random graphs. Our main concern is to determine the threshold probability pF for the existence of Maker's strategy to claim a member of in the unbiased game played on the edges of random graph G(n, p), for various target families of winning sets. More generally, for each probability above this threshold we study the smallest bias b such that Maker wins the (1: b) biased game. We investigate these functions for a number of basic games, like the connectivity game, the perfect matching game, the clique game and the Hamiltonian cycle game.

Milos Stojakovic; Tibor Szabo

2005-01-01T23:59:59.000Z

166

Truncations of Random Orthogonal Matrices  

E-Print Network (OSTI)

Statistical properties of non--symmetric real random matrices of size $M$, obtained as truncations of random orthogonal $N\\times N$ matrices are investigated. We derive an exact formula for the density of eigenvalues which consists of two components: finite fraction of eigenvalues are real, while the remaining part of the spectrum is located inside the unit disk symmetrically with respect to the real axis. In the case of strong non--orthogonality, $M/N=$const, the behavior typical to real Ginibre ensemble is found. In the case $M=N-L$ with fixed $L$, a universal distribution of resonance widths is recovered.

Boris A. Khoruzhenko; Hans-Juergen Sommers; Karol Zyczkowski

2010-08-12T23:59:59.000Z

167

Vibration Budget for SuperB  

Science Conference Proceedings (OSTI)

We present a vibration budget for the SuperB accelerator. We include ground motion data, motion sensitivity of machine components, and beam feedback system requirements. The SuperB accelerator design attains at least 50 times higher than current B-factories due to smaller beam sizes and a crabbed waist crossing angle scheme at the IP (interaction point). The beam size (1{sigma}) at the IP will be about 10 {micro}m (horizontal) by 40 nm (vertical). These small beam sizes will make the luminosity very sensitive to mechanical vibration and electrical noise. Relative vertical misalignment of the two beams at the IP by only 8 nm will result in a 1% reduction in luminosity. The corresponding horizontal alignment tolerance of is 250x looser (2 {micro}m). The vertical beam angle at the IP for a 1% luminosity loss is fairly loose at 200 {micro}rad, and the horizontal beam angle tolerance is looser still. We will focus on vertical beam position at the IP, since this presents the greatest alignment challenge. The values presented here are for a closed orbit with tunes near a half-integer in the SuperB v.12 lattice.

Bertsche, K; Wittmer, W.; /SLAC; Bolzon, B.; Brunetti, L.; Jeremie, A.; /Annecy, LAPP; Esposito, M.; Tomassini, S.; /Frascati

2011-04-05T23:59:59.000Z

168

Compensated vibrating optical fiber pressure measuring device  

SciTech Connect

A microbending optical fiber is attached under tension to a diaphragm to se a differential pressure applied across the diaphragm which it causes it to deflect. The fiber is attached to the diaphragm so that one portion of the fiber, attached to a central portion of the diaphragm, undergoes a change in tension; proportional to the differential pressure applied to the diaphragm while a second portion attached at the periphery of the diaphragm remains at a reference tension. Both portions of the fiber are caused to vibrate at their natural frequencies. Light transmitted through the fiber is attenuated by both portions of the tensioned sections of the fiber by an amount which increases with the curvature of fiber bending so that the light signal is modulated by both portions of the fiber at separate frequencies. The modulated light signal is transduced into a electrical signal. The separate modulation signals are detected to generate separate signals having frequencies corresponding to the reference and measuring vibrating sections of the continuous fiber, respectively. A signal proportional to the difference between these signals is generated which is indicative of the measured pressure differential across the diaphragm. The reference portion of the fiber is used to compensate the pressure signal for zero and span changes resulting from ambient temperature and humidity effects upon the fiber and the transducer fixture.

Fasching, George E. (Morgantown, WV); Goff, David R. (Christiansburg, VA)

1987-01-01T23:59:59.000Z

169

SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD  

E-Print Network (OSTI)

SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD DISK DRIVES Tsung-Lin Chen density and spindle rotation speed in hard disk drives, airflow excited suspension vibration (windage with the MA (Li and Horowitz, 2001a). Several MA designs have been proposed for dual- stage actuation in hard

Horowitz, Roberto

170

Expert system development for vibration analysis in machine condition monitoring  

Science Conference Proceedings (OSTI)

Expert systems can be adapted for machine condition monitoring data interpretation due to the ability to identify systematic reasoning processes. As vibration analysis in condition monitoring is still generally performed by highly trained professionals, ... Keywords: Condition monitoring, Expert system, Vibration analysis

Stephan Ebersbach; Zhongxiao Peng

2008-01-01T23:59:59.000Z

171

Electromagnetic Buckled Beam Oscillator for Enhanced Vibration Energy Harvesting  

Science Conference Proceedings (OSTI)

In this work, a nonlinear vibration energy harvester consisting of a buckled beam and an electromagnetic transducer is proposed. An advantage of this device is that there is no need of permanent magnets to create the bistable potential. Theoretical modeling ... Keywords: Vibration energy harvester (VEH), non linear system, bistability, Duffing oscillator, electromagnetic generators (EMG)

F. Cottone, P. Basset, H. Vocca, L. Gammaitoni

2012-11-01T23:59:59.000Z

172

Exploring the impulsion and vibration effects of tactile patterns  

Science Conference Proceedings (OSTI)

This paper explores the impulsion and vibration properties of different tactile patterns. These properties describe the unique states of the pins for example raised or lowered. The tactile feedback is provided by Braille pins on a finger and is in the ... Keywords: braille cell, impulsion, selection, tactile feedback, tactile patterns, vibration

Muhammad Tahir; Gilles Bailly; Eric Lecolinet

2008-09-01T23:59:59.000Z

173

A Mathematical Model for a Vibrating Human Head  

Science Conference Proceedings (OSTI)

In this paper, a mathematical model has been formulated to study the vibration of the human head. In the mathematical analysis of the model, the skull is considered as an anisotropic spherical shell and brain matter is represented as an inviscid compressible ... Keywords: Anisotropic, Human Head, Laplace Transformation, Skull Vibration, Stress Distribution

J. C. Misra; S. Dandapat; S. Adhikary

2010-04-01T23:59:59.000Z

174

Exact Semiclassical Calculations of Translational-Vibrational Energy Transfer  

SciTech Connect

We present "exact" calculations, by the semiclassical method, of vibrational excitation of a harmonic diatomic molecule A-B, in its ground vibrational state, upon collinear collision with an atom C. Results are compared with those of first-order quantum mechanical time dependent perturbation methods and those of purely classical methods.

Kelley, J. Daniel; Wolfsberg, Max

1966-07-22T23:59:59.000Z

175

Smart Vibration Monitoring System for an Ocean Turbine  

Science Conference Proceedings (OSTI)

This paper describes a Smart Vibration Monitoring System (SVMS) developed as an effective way to reduce equipment losses and enhance safety, efficiency, reliability, availability and long life time duration of an ocean turbine. The system utilizes advanced ... Keywords: Diagnostics, Vibration, Monitoring, Dynamometer, Ocean Turbine

Mustapha Mjit; Pierre-Philippe J. Beaujean; David J. Vendittis

2011-11-01T23:59:59.000Z

176

Analysis of Shear-horizontal Vibrations of Crystal Plates for Acoustic Wave Resonators and Sensors  

E-Print Network (OSTI)

Effects of piezoelectric coupling on energy trapping ofEnergy Trapping in High-Frequency Vibrations of PiezoelectricEnergy Trapping in High-Frequency Vibrations of Piezoelectric

Liu, Bo

2010-01-01T23:59:59.000Z

177

Ground vibration model studies for APS storage ring  

SciTech Connect

An analytical ground vibration model is developed for study of the vibration effects on the beam motion in the Advanced Photon Source (APS) storage ring. The different physical parameters associated with the wave characteristics and the vibration modes needed for the study are taken from the vibration studies carried out at the APS site. The implementation has been carried out using Mathematica{trademark}. The study is carried out for the frequency range 1--35 Hz, with a number of sources changing from one through ten. The program written in Mathematica{trademark}, calculates orbit distortion, beta wave change, tune change, dispersion change, and chromaticity change. However, the main parameter studied for the APS storage ring has been the orbit distortion. The merit factor associated with different modes excited by the vibrations has been calculated.

Koul, R.K.

1994-07-01T23:59:59.000Z

178

2010 GRC VIBRATIONAL SPECTROSCOPY AUGUST 1 - AUGUST 6, 2010  

SciTech Connect

The Vibrational Spectroscopy conference focuses on using vibrational spectroscopy to probe structure and dynamics of molecules in gases, liquids, and at interfaces. The conference explores the wide range of state-of-the-art techniques based on vibrational motion. These techniques span the fields of time-domain, high-resolution frequency-domain, spatially-resolved, nonlinear and multidimensional spectroscopies. The conference highlights the application of these techniques in chemistry, materials, biology, and medicine. The theory of molecular vibrational motion and its connection to spectroscopic signatures and chemical reaction dynamics is the third major theme of the meeting. The goal is to bring together a collection of researchers who share common interests and who will gain from discussing work at the forefront of several connected areas. The intent is to emphasize the insights and understanding that studies of vibrations provide about a variety of molecular systems ranging from small polyatomic molecules to large biomolecules and nanomaterials.

Brooks Pate

2010-08-06T23:59:59.000Z

179

Randomized Benchmarking of Quantum Gates  

E-Print Network (OSTI)

A key requirement for scalable quantum computing is that elementary quantum gates can be implemented with sufficiently low error. One method for determining the error behavior of a gate implementation is to perform process tomography. However, standard process tomography is limited by errors in state preparation, measurement and one-qubit gates. It suffers from inefficient scaling with number of qubits and does not detect adverse error-compounding when gates are composed in long sequences. An additional problem is due to the fact that desirable error probabilities for scalable quantum computing are of the order of 0.0001 or lower. Experimentally proving such low errors is challenging. We describe a randomized benchmarking method that yields estimates of the computationally relevant errors without relying on accurate state preparation and measurement. Since it involves long sequences of randomly chosen gates, it also verifies that error behavior is stable when used in long computations. We implemented randomized benchmarking on trapped atomic ion qubits, establishing a one-qubit error probability per randomized pi/2 pulse of 0.00482(17) in a particular experiment. We expect this error probability to be readily improved with straightforward technical modifications.

E. Knill; D. Leibfried; R. Reichle; J. Britton; R. B. Blakestad; J. D. Jost; C. Langer; R. Ozeri; S. Seidelin; D. J. Wineland

2007-07-06T23:59:59.000Z

180

Expanders via random spanning trees  

Science Conference Proceedings (OSTI)

Motivated by the problem of routing reliably and scalably in a graph, we introduce the notion of a splicer, the union of spanning trees of a graph. We prove that for any bounded-degree n-vertex graph, the union of two random spanning ...

Navin Goyal; Luis Rademacher; Santosh Vempala

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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.


181

Accelerometers and randomness: perfect together  

Science Conference Proceedings (OSTI)

Accelerometers are versatile sensors that are nearly ubiquitous. They are available on a wide variety of devices and are particularly common on those that are mobile or have wireless capabilities. Accelerometers are applicable in a number of settings ... Keywords: computational RFID, random number generation, sensors, ubiquitous computing

Jonathan Voris; Nitesh Saxena; Tzipora Halevi

2011-06-01T23:59:59.000Z

182

A Multi-Objective Production Inventory Model with Backorder for Fuzzy Random Demand Under Flexibility and Reliability  

Science Conference Proceedings (OSTI)

In this paper, an Economic Production Quantity (EPQ) model is developed with flexibility and reliability consideration of production process in an imprecise and uncertain mixed environment. The model has incorporated fuzzy random demand, an imprecise ... Keywords: Flexibility, Fuzzy random variable, Imprecise preparation time, Interval arithmetic, Reliability

Nita H. Shah; Hardik Soni

2011-12-01T23:59:59.000Z

183

Optimization and AMS Modeling for Design of an Electrostatic Vibration Energy Harvester's Conditioning Circuit with an Auto-Adaptive Process to the External Vibration Changes  

E-Print Network (OSTI)

Electrostatic transducers for vibration energy scavenging have been an object to numerous studies, but are still facing major issues relating to their conditioning circuit. One of the most popular ones uses a charge pump and a flyback circuit based on a Buck DC-DC converter (Fig. 1). A commutation between the energy accumulation in the charge pump and the recharge of the buffer capacitor Cres is assured by a switch which is the major bottleneck in the energy harvester circuit. The commutation timing of the switch determines the efficiency of the energy harvesting. In previous papers [1] the switch commutates periodically with some fixed duty ratio. However, this solution is not appropriate when the environment parameters, e.g. the vibration frequency, change. We found that the switching should be ordered by the internal state of the circuit, an not by some fixed timing scenario. We presents how to find the optimal operation mode of the harvester. To validate the study, the system was modeled using a mixed VHD...

Galayko, Dimitri; Paracha, Ayyaz Mahmood

2008-01-01T23:59:59.000Z

184

Population and Environment  

E-Print Network (OSTI)

. . . . . . . . . . . . . . . . . . . . . 356 Coastal and Marine Environments . . . . . . . . . . . . . . . . . 358 Energy, Air Pollution or growth. Indeed, an overlay of graphs depicting global trends in population, energy consumption, carbon; coastal and marine environments; and energy, air pollu- tion, and climate change. In the concluding

185

Reusable vibration resistant integrated circuit mounting socket  

DOE Patents (OSTI)

This invention discloses a novel form of socket for integrated circuits to be mounted on printed circuit boards. The socket uses a novel contact which is fabricated out of a bimetallic strip with a shape which makes the end of the strip move laterally as temperature changes. The end of the strip forms a barb which digs into an integrated circuit lead at normal temperatures and holds it firmly in the contact, preventing loosening and open circuits from vibration. By cooling the contact containing the bimetallic strip the barb end can be made to release so that the integrated circuit lead can be removed from the socket without damage either to the lead or to the socket components.

Evans, Craig N. (Irwin, PA)

1995-01-01T23:59:59.000Z

186

HDR (Heissdampfreaktor) Phase 2 vibrational experiments  

Science Conference Proceedings (OSTI)

As part of the second phase of vibrational/earthquake investigations at the HDR (Heissdampfreaktor) Test Facility in Kahl/Main, FRG, high-level shaker tests (SHAG) were performed during June and July 1986. The purpose of these experiments is to investigate full-scale structural response, soil-structure interaction, and piping and equipment response under strong excitation conditions. While global safety considerations imposed load limitations, the HDR soil/structure system was nevertheless tested to its capacity limits. The performance of up to seven different multiple support pipe hanger configurations (ranging from flexible to stiff systems) was evaluated in the tests. Data obtained in the tests serve to validate analysis methods.

Malcher, L.; Kot, C.A.

1986-10-01T23:59:59.000Z

187

A vibration model for centrifugal contactors  

Science Conference Proceedings (OSTI)

Using the transfer matrix method, we created the Excel worksheet ``Beam`` for analyzing vibrations in centrifugal contactors. With this worksheet, a user can calculate the first natural frequency of the motor/rotor system for a centrifugal contactor. We determined a typical value for the bearing stiffness (k{sub B}) of a motor after measuring the k{sub B} value for three different motors. The k{sub B} value is an important parameter in this model, but it is not normally available for motors. The assumptions that we made in creating the Beam worksheet were verified by comparing the calculated results with those from a VAX computer program, BEAM IV. The Beam worksheet was applied to several contactor designs for which we have experimental data and found to work well.

Leonard, R.A.; Wasserman, M.O.; Wygmans, D.G.

1992-11-01T23:59:59.000Z

188

Size separation in vibrated granular matter  

E-Print Network (OSTI)

We review recent developments in size separation in vibrated granular materials. Motivated by a need in industry to efficiently handle granular materials and a desire to make fundamental advances in non-equilibrium physics, experimental and theoretical investigations have shown size separation to be a complex phenomena. Large particles in a vibrated granular system invariably rise to the top. However, they may also sink to the bottom, or show other patterns depending on subtle variations in physical conditions. While size ratio is a dominant factor, particle specific properties such as density, inelasticity and friction can play an important role. The nature of the energy input, boundary conditions and interstitial air have been also shown to be significant factors in determining spatial distributions. The presence of convection can enhance mixing or lead to size separation. Experimental techniques including direct visualization and magnetic resonance imaging are being used to investigate these properties. Molecular dynamics and Monte Carlo simulation techniques have been developed to probe size separation. Analytical methods such as kinetic theory are being used to study the interplay between particle size and density in the vibro-fluidized regime, and geometric models have been proposed to describe size separation for deep beds. Besides discussing these studies, we will also review the impact of inelastic collision and friction on the density and velocity distributions to gain a deeper appreciation of the non-equilibrium nature of the system. While a substantial number of studies have been accomplished, considerable work is still required to achieve a firm description of the phenomena.

A. Kudrolli

2004-02-06T23:59:59.000Z

189

Strong-field optical control of vibrational dynamics: Vibrational Stark effect in planar acetylene  

SciTech Connect

We perform quantum mechanical simulations of vibrational excitation of planar (5D) acetylene (HCCH) with linearly polarized, intense but nonionizing, infrared laser pulses, exploring one particular pathway for exciting the HCCH molecule into a CC-stretching state via the fundamental excitation in a two-pulse scheme. We optimize the pulse widths, time centers, and carrier frequencies of the two pulses to achieve the maximal projection onto the target CC-stretching state, (0,3,0,0,0) A{sub 1}, subject to penalties related to peak electric field and pulse duration. The influences of Fermi resonance, the vibrational Stark effect, and avoided crossings on the selective excitation are discussed. Different sizes of {open_quotes}essential-states{close_quotes} representation are used and checked against the underlying 299 475-point discrete variable representation (DVR) basis. We find that an essential-states basis consisting of 362 A{sub 1} and B{sub 2} eigenstates represents the results of a full-grid calculation for the excitation process under study. Moreover, we demonstrate that despite the complications associated with the higher dimensionality of the 5D model, we can nevertheless exert infrared laser control over the vibrational dynamics of selective excitation. {copyright} {ital 1999 American Institute of Physics.}

Liu, L.; Muckerman, J.T. [Chemistry Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York,11973-5000 (United States)

1999-02-01T23:59:59.000Z

190

Computing environment logbook  

DOE Patents (OSTI)

A computing environment logbook logs events occurring within a computing environment. The events are displayed as a history of past events within the logbook of the computing environment. The logbook provides search functionality to search through the history of past events to find one or more selected past events, and further, enables an undo of the one or more selected past events.

Osbourn, Gordon C; Bouchard, Ann M

2012-09-18T23:59:59.000Z

191

Damping of Quantum Vibrations Revealed in Deep Sub-barrier Fusion  

E-Print Network (OSTI)

We demonstrate that when two colliding nuclei approach each other, their quantum vibrations are damped near the touching point. We show that this damping is responsible for the fusion hindrance phenomena measured in the deep sub-barrier fusion reactions. To show those, we for the first time apply the random-phase-approximation (RPA) method to the two-body $^{16}$O + $^{16}$O and $^{40}$Ca + $^{40}$Ca systems. We calculate the octupole transition strengths for the two nuclei adiabatically approaching each other. The calculated transition strength drastically decreases near the touching point, strongly suggesting the vanishing of the quantum couplings between the relative motion and the vibrational intrinsic degrees of freedom of each nucleus. Based on this picture, we also calculate the fusion cross section for the $^{40}$Ca + $^{40}$Ca system using the coupled-channel method with the damping factor simulating the vanishing of the couplings. The calculated results reproduce well the experimental data, indicating that the smooth transition from the sudden to adiabatic processes indeed occurs in the deep sub-barrier fusion reactions.

Takatoshi Ichikawa; Kenichi Matsuyanagi

2013-02-28T23:59:59.000Z

192

Random Deployment of Data Collectors for Serving Randomly-Located Sensors  

E-Print Network (OSTI)

Recently, wireless communication industries have begun to extend their services to machine-type communication devices as well as to the user equipment. Such machine-type communication devices as meters and sensors need intermittent uplink resources to report measured or sensed data to their serving data collector. It is however hard to dedicate limited uplink resources to each of them. Thus, efficient service of a tremendous number of devices with low activities may consider simple random access as a solution. The data collectors receiving the measured data from many sensors simultaneously can successfully decode only signals with signal-to-interference-plus-noise-ratio (SINR) above a certain value. The main design issues for this environment become how many data collectors are needed, how much power sensor nodes transmit with, and how wireless channels affect the performance. This paper provides answers to those questions through a stochastic analysis based on a spatial point process and on simulations.

Kwon, Taesoo

2011-01-01T23:59:59.000Z

193

Neuro-fuzzy control of vertical vibrations in railcars using magnetorheological dampers  

E-Print Network (OSTI)

Control of vertical vibrations in a railcar is a critical issue that has been addressed by many researchers in the past. This thesis presents a new approach to solving the problem by using a semi-active viscous damper in tandem with a neuro-fuzzy controller. A pair of magnetorheological (MR) dampers is designed and installed in a rail truck. Two neuro-fuzzy systems, Adaptive Neuro-Fuzzy Inference System (ANFIS) and Neuro Fuzzy Controller (NEFCON), are used to emulate behavior of the MR dampers and to train a controller fuzzy inference system (FIS), respectively. In order to design the dampers, a series of numerical simulations is conducted for a fully loaded railcar traveling over a wide range of velocities to estimate the magnitude of critical accelerations. A variety of damping coefficients are assumed for a linear viscous damper to determine the force requirements of the MR dampers. Based on design parameters provided by Lord Corporation, two MR dampers are fabricated and assembled. These dampers are tested extensively in a laboratory and data obtained from these tests are used to train, test, and validate a fuzzy model of each damper. Two controller FIS are trained using NEFCON in a numerical environment to send a time varying voltage signal to the two MR dampers during motion in the railcar. Determination of the voltage signal to the dampers is based solely on feedback from accelerometers attached to the railcar. A detailed parametric study is carried out to evaluate the effectiveness of the fuzzy controllers in reducing vibrations of a railcar for different haul conditions. The performance of MR dampers in their passive-off, passive-on, and semi-active operating condition is compared with that of four linear viscous dampers. Finally, an idealized model of each MR damper is developed and the ability of each corresponding controller to reduce vibrations is also evaluated. Results indicate that the semi-active vibration control strategy can reduce vibrations of the railcar to within a specified limit, provided that a sufficient level of resisting force is applied by both dampers. Further research into full-scale field-testing of railcars with MR dampers installed in them is advocated.

Atray, Vipul Sunil

2002-01-01T23:59:59.000Z

194

Generating Cosmological Gaussian Random Fields  

E-Print Network (OSTI)

We present a generic algorithm for generating Gaussian random initial conditions for cosmological simulations on periodic rectangular lattices. We show that imposing periodic boundary conditions on the real-space correlator and choosing initial conditions by convolving a white noise random field results in a significantly smaller error than the traditional procedure of using the power spectrum. This convolution picture produces exact correlation functions out to separations of L/2, where L is the box size, which is the maximum theoretically allowed. This method also produces tophat sphere fluctuations which are exact at radii $ R \\le L/4 $. It is equivalent to windowing the power spectrum with the simulation volume before discretizing, thus bypassing sparse sampling problems. The mean density perturbation in the volume is no longer constrained to be zero, allowing one to assemble a large simulation using a series of smaller ones. This is especially important for simulations of Lyman-$\\alpha$ systems where sma...

Pen, U L

1997-01-01T23:59:59.000Z

195

Lecture 2227 Continuous Random Variables  

E-Print Network (OSTI)

-x/100 dx = -e-x/100 100 0 = 1 - e-1 = .632 text typo Example 3 (Light Bulb): The lifetime X, in hours, of a certain kind of light bulb is a continuous random variable with density f(x) = 1500 x2 I(1500,) Check = 1 4 = p Let B denote the number of failures before 2000 hours among 5 light bulbs. Then P(B 1) = P

Scholz, Fritz

196

Lecture 2227 Continuous Random Variables  

E-Print Network (OSTI)

) = 100 0 1 100 e-x/100 dx = -e-x/100 100 0 = 1 - e-1 = .632 text typo Example 3 (Light Bulb): The lifetime X, in hours, of a certain kind of light bulb is a continuous random variable with density f 2000 1500 = 1 - 3 4 = 1 4 = p Let B denote the number of failures before 2000 hours among 5 light bulbs

Scholz, Fritz

197

Vibration-Induced Conductance Fluctuation (VICOF) Testing of Soils  

E-Print Network (OSTI)

In this Letter, we propose and experimentally demonstrate a simple method to provide additional information by conductance measurements of soils. While the AC electrical conductance of the soil is measured, it is exposed to a periodic vibration. The vibration-induced density fluctuation implies a corresponding conductivity fluctuation that can be seen as combination frequency components, the sum and the difference of the mean AC frequency and the vibration frequency, in the current response. The method is demonstrated by measurements on two different soil types.

Kish, L B; Kishne, A S; Kish, Laszlo B.; Morgan, Cristine L.S.; Kishne, Andrea Sz.

2005-01-01T23:59:59.000Z

198

Vibration-Induced Conductivity Fluctuation (VICOF) Testing of Soils  

E-Print Network (OSTI)

In this Letter, we propose and experimentally demonstrate a simple method to provide additional in-formation by conductivity measurements of soils. The AC electrical conductance of the soil is measured while it is exposed to a periodic vibration. The vibration-induced density fluctuation implies a corresponding conductivity fluctuation that can be seen as combination frequency components, the sum and the difference of the mean AC frequency and the double of vibration frequency, in the current response. The method is demonstrated by measurements on clayey and sandy soils.

Laszlo B. Kish; Cristine L. S. Morgan; Andrea Sz. Kishne

2005-10-31T23:59:59.000Z

199

Micro manipulator motion control to counteract macro manipulator structural vibrations  

Science Conference Proceedings (OSTI)

Inertial force damping control by micro manipulator modulation is proposed to suppress the vibrations of a micro/macro manipulator system. The proposed controller, developed using classical control theory, is added to the existing control system. The proposed controller uses real-time measurements of macro manipulator flexibility to adjust the motion of the micro manipulator to counteract structural vibrations. Experimental studies using an existing micro/macro flexible link manipulator testbed demonstrate the effectiveness of the proposed approach to suppression of vibrations in the macro/micro manipulator system using micro-manipulator-based inertial active damping control.

Lew, J.Y.; Trudnowski, D.J.; Evans, M.S.; Bennett, D.W.

1995-02-01T23:59:59.000Z

200

NERSC Modules Software Environment  

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

Environment » Modules Environment Environment » Modules Environment Modules Software Environment NERSC uses the module utility to manage nearly all software. There are two huge advantages of the module approach: NERSC can provide many different versions and/or installations of a single software package on a given machine, including a default version as well as several older and newer versions; and Users can easily switch to different versions or installations without having to explicitly specify different paths. With modules, the MANPATH and related environment variables are automatically managed. Users simply ``load'' and ``unload'' modules to control their environment. The module utility consists of two parts: the module command itself and the modulefiles on which it operates. Module Command

Note: This page contains sample records for the topic "random vibration environment" 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.


201

Efficient Construction of (Distributed) Verifiable Random Functions  

Science Conference Proceedings (OSTI)

We give the first simple and efficient construction of verifiable random functions (VRFs). VRFs, introduced by Micali et al. [13], combine the properties of regular pseudorandom functions (PRFs) (i.e., indistinguishability from a random function) and ...

Yevgeniy Dodis

2003-01-01T23:59:59.000Z

202

Source codes as random number generators  

E-Print Network (OSTI)

Abstract—A random number generator generates fair coin flips by processing deterministically an arbitrary source of nonideal randomness. An optimal random number generator generates asymptotically fair coin flips from a stationary ergodic source at a rate of bits per source symbol equal to the entropy rate of the source. Since optimal noiseless data compression codes produce incompressible outputs, it is natural to investigate their capabilities as optimal random number generators. In this paper we show under general conditions that optimal variable-length source codes asymptotically achieve optimal variable-length random bit generation in a rather strong sense. In particular, we show in what sense the Lempel–Ziv algorithm can be considered an optimal universal random bit generator from arbitrary stationary ergodic random sources with unknown distributions. Index Terms — Data compression, entropy, Lempel–Ziv algorithm, random number generation, universal source coding.

Karthik Visweswariah; Student Member; Sanjeev R. Kulkarni; Senior Member; Sergio Verdú

1998-01-01T23:59:59.000Z

203

Magnetic induction systems to harvest energy from mechanical vibrations  

E-Print Network (OSTI)

This thesis documents the design process for magnetic induction systems to harvest energy from mechanical vibrations. Two styles of magnetic induction systems - magnet-through-coil and magnet-across-coils - were analyzed. ...

Jonnalagadda, Aparna S

2007-01-01T23:59:59.000Z

204

Local discriminant bases in machine fault diagnosis using vibration signals  

Science Conference Proceedings (OSTI)

Wavelets and local discriminant bases (LDB) selection algorithm is applied to vibration signals in a single-cylinder spark ignition engine for feature extraction and fault classification. LDB selects a complete orthogonal basis from a wavelet packet ...

R. Tafreshi; F. Sassani; H. Ahmadi; G. Dumont

2005-04-01T23:59:59.000Z

205

Element and system design for active and passive vibration isolation  

E-Print Network (OSTI)

This thesis focusses on broadband vibration isolation, with an emphasis on control of absolute payload motion for ultra-precision instruments such as the MIT/Caltech Laser-Interferometric Gravitational Wave Observatory ...

Zuo, Lei, 1974-

2005-01-01T23:59:59.000Z

206

Modeling and design of a MEMS piezoelectric vibration energy harvester  

E-Print Network (OSTI)

The modeling and design of MEMS-scale piezoelectric-based vibration energy harvesters (MPVEH) are presented. The work is motivated by the need for pervasive and limitless power for wireless sensor nodes that have application ...

Du Toit, Noël Eduard

2005-01-01T23:59:59.000Z

207

A Quantum of Vibration in an Unexpected Place | Advanced Photon...  

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

2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed A Quantum of Vibration in an Unexpected Place OCTOBER 21, 2008 Bookmark and Share Upper panel:...

208

Energy harvesting from wind-induced vibration of suspension bridges  

E-Print Network (OSTI)

Recently, an extensive amount of research has been focused on energy harvesting from structural vibration sources for wireless self-powered microsystem applications. One method of energy harvesting is using electromagnetic ...

Shi, Miao, M. Eng. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

209

Parking Infrastructure and the Environment  

E-Print Network (OSTI)

affects energy demand, the environment, and the social costEngineering and the Built Environment, and A ffiliatespread throughout the built environment. However, LCA is a

Chester, Mikhail; Horvath, Aprad; Madanat, Samer

2011-01-01T23:59:59.000Z

210

On random sampling auctions for digital goods  

Science Conference Proceedings (OSTI)

In the context of auctions for digital goods, an interesting Random Sampling Optimal Price auction (RSOP) has been proposed by Goldberg, Hartline and Wright; this leads to a truthful mechanism. Since random sampling is a popular approach for auctions ... Keywords: auction, mechanism design, random sampling

Saeed Alaei; Azarakhsh Malekian; Aravind Srinivasan

2009-07-01T23:59:59.000Z

211

Infrared Probe for Application to Steam Turbine Blade Vibration Detection  

Science Conference Proceedings (OSTI)

Technology for non-contacting steam turbine blade tip vibration measurement has advanced to the point of being a viable tool for risk management in situations where turbine blade high-cycle vibration occurs as a result of operating parameters or blade condition. This report describes the development and prototype testing of a new type of blade tip time-of-arrival sensing system for use with commercial signal processing systems.

2004-12-16T23:59:59.000Z

212

Vibration Model Validation for Linear Collider Detector Platforms  

SciTech Connect

The ILC and CLIC reference designs incorporate reinforced-concrete platforms underneath the detectors so that the two detectors can each be moved onto and off of the beamline in a Push-Pull configuration. These platforms could potentially amplify ground vibrations, which would reduce luminosity. In this paper we compare vibration models to experimental data on reinforced concrete structures, estimate the impact on luminosity, and summarize implications for the design of a reinforced concrete platform for the ILC or CLIC detectors.

Bertsche, Kirk; Amann, J.W.; Markiewicz, T.W.; Oriunno, M.; Weidemann, A.; White, G.; /SLAC

2012-05-16T23:59:59.000Z

213

Optical manipulation of intrinsic localized vibrational energy in cantilever arrays  

E-Print Network (OSTI)

Optically-induced real-time impurity modes are used to shepherd intrinsic localized vibrational modes (discrete breathers) along micromechanical arrays via either attractive or replulsive interactions. Adding an electrode to the cantilever array provides control of the sign of lattice anharmonicity, hence allowing both hard and soft nonlinearities to be studied. A number of dynamical effects are demonstrated and explained, including the optical tweezing of localized vibrational energy in a nonlinear lattice.

M. Sato; B. E. Hubbard; A. J. Sievers; B. Ilic; H. G. Craighead

2004-03-16T23:59:59.000Z

214

STAR Test Environment  

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

STAR Test Environment STAR Test Environment STAR Test Environment These instructions describe how to set up the STAR environment independent of the production environment in order to test different installations in $OPTSTAR and $GROUP_DIR. If you want to modify those installations you will need access to the starofl account. Bypass STAR envionment login Edit your ~/.pdsf_setup file changing the STAR_LINUX_SETUP to "use_none" and start a new session. You should not see all the STAR environmental variables defined when you do this (and it will probably be much quicker than usual, too). Do a manual STAR login If you want to modify what test environment you use copy the test login scripts to your own working area: cp -r /common/star/startest /path/to/myworkdir/. If you don't want to modify these files you can source them directly from

215

Randomized selection on the GPU  

SciTech Connect

We implement here a fast and memory-sparing probabilistic top N selection algorithm on the GPU. To our knowledge, this is the first direct selection in the literature for the GPU. The algorithm proceeds via a probabilistic-guess-and-chcck process searching for the Nth element. It always gives a correct result and always terminates. The use of randomization reduces the amount of data that needs heavy processing, and so reduces the average time required for the algorithm. Probabilistic Las Vegas algorithms of this kind are a form of stochastic optimization and can be well suited to more general parallel processors with limited amounts of fast memory.

Monroe, Laura Marie [Los Alamos National Laboratory; Wendelberger, Joanne R [Los Alamos National Laboratory; Michalak, Sarah E [Los Alamos National Laboratory

2011-01-13T23:59:59.000Z

216

Superdiffusion in a Model for Diffusion in a Molecularly Crowded Environment  

E-Print Network (OSTI)

We present a model for diffusion in a molecularly crowded environment. The model consists of random barriers in percolation network. Random walks in the presence of slowly moving barriers show normal diffusion for long times, but anomalous diffusion at intermediate times. The effective exponents for square distance versus time usually are below one at these intermediate times, but can be also larger than one for high barrier concentrations. Thus we observe sub- as well as super-diffusion in a crowded environment.

Dietrich Stauffer; Christian Schulze; Dieter W. Heermann

2007-06-05T23:59:59.000Z

217

Fermi UNIX trademark environment  

SciTech Connect

The introduction of UNIX at Fermilab involves multiple platforms and multiple vendors. Additionally, a single user may have to use more than one platform. This heterogeneity and multiplicity makes it necessary to define a Fermilab environment for UNIX so that as much as possible the systems look and feel'' the same. We describe our environment, including both the commercial products and the local tools used to support it. Other products designed for the UNIX environment are also described. 19 refs.

Nicholls, J.

1991-03-01T23:59:59.000Z

218

MHK Technologies/Vortex Induced Vibrations Aquatic Clean Energy VIVACE |  

Open Energy Info (EERE)

Vortex Induced Vibrations Aquatic Clean Energy VIVACE Vortex Induced Vibrations Aquatic Clean Energy VIVACE < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Vortex Induced Vibrations Aquatic Clean Energy VIVACE.jpg Technology Profile Primary Organization Vortex Hydro Energy LLC Project(s) where this technology is utilized *MHK Projects/Marine Hydrodynamics Laboratory at the University of Michigan Technology Resource Click here Current/Tidal Technology Type Click here Reciprocating Device Technology Readiness Level Click here TRL 4: Proof of Concept Technology Description The VIVACE (Vortex Induced Vibrations Aquatic Clean Energy) device is based on the extensively studied phenomenon of Vortex Induced Vibrations (VIV), which was first observed five-hundred years ago by Leonardo DaVinci in the form of 'Aeolian Tones.' VIV results from vortices forming and shedding on the downstream side of a bluff body in a current. Vortex shedding alternates from one side to the other, thereby creating a vibration or oscillation. The VIV phenomenon is non-linear, which means it can produce useful energy at high efficiency over a wide range of current speeds and directions.This converter is unlike any existing technology, as it does not use turbines, propellers, or dams. VIVACE converts the horizontal hydrokinetic energy of currents into cylinder mechanical energy. The latter is then converted to electricity through electric power generators.

219

Indoor Environment Group  

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

Indoor Environment Group Indoor Environment Group The Indoor Environment Group performs research that aims to maintain healthy and productive indoor environments while buildings are made more energy efficient. We study the links between indoor environmental quality, building ventilation, building energy efficiency and occupants' health, performance and comfort. We undertake experiments in laboratory and field settings and employ modeling to characterize indoor environmental conditions and evaluate the fate, transport and chemical transformations of indoor pollutants. We elucidate pathways of pollutant exposure, evaluate and develop energy efficient means of controlling indoor environmental quality, and provide input for related guidelines and standards. Contacts William Fisk WJFisk@lbl.gov (510) 486-5910

220

Environment/Climate Portal  

Science Conference Proceedings (OSTI)

... exercises for environmental contaminants in marine specimens were administered in 2007/2008 by the … more. >> see all Environment/Climate ...

2013-10-23T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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.


221

The Ideal Environment - CECM  

E-Print Network (OSTI)

... would surely thrive within the conditions outlined above. That said, there are formidable difficulties to providing and maintaining such an ideal environment.

222

Environment | Argonne National Laboratory  

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

Environment Atmospheric and Climate Science Ecological Resources and Systems Environmental Security and Restoration Land and Renewable Resources Radiation and Chemical Risk...

223

Generating Cosmological Gaussian Random Fields  

E-Print Network (OSTI)

We present a generic algorithm for generating Gaussian random initial conditions for cosmological simulations on periodic rectangular lattices. We show that imposing periodic boundary conditions on the real-space correlator and choosing initial conditions by convolving a white noise random field results in a significantly smaller error than the traditional procedure of using the power spectrum. This convolution picture produces exact correlation functions out to separations of L/2, where L is the box size, which is the maximum theoretically allowed. This method also produces tophat sphere fluctuations which are exact at radii $ R \\le L/4 $. It is equivalent to windowing the power spectrum with the simulation volume before discretizing, thus bypassing sparse sampling problems. The mean density perturbation in the volume is no longer constrained to be zero, allowing one to assemble a large simulation using a series of smaller ones. This is especially important for simulations of Lyman-$\\alpha$ systems where small boxes with steep power spectra are routinely used. We also present an extension of this procedure which generates exact initial conditions for hierarchical grids at negligible cost.

Ue-Li Pen

1997-09-25T23:59:59.000Z

224

Environment and Climate in MML  

Science Conference Proceedings (OSTI)

... Laboratory's work in the areas of environment and climate ... soil, atmosphere, marine and aquatic environments, and environmental threats, and ...

2012-06-12T23:59:59.000Z

225

E3: Economy, Energy Environment  

Science Conference Proceedings (OSTI)

E3: Economy, Energy, and Environment. "Our goal is to ... in 2012. Download E3: Economy, Energy, Environment. For more ...

2012-10-17T23:59:59.000Z

226

Vibration of a tube bundle in two-phase Freon cross-flow  

SciTech Connect

Two-phase cross-flow exists in many shell-and-tube heat exchangers. The U-bend region of nuclear steam generators is a prime example. Testing in two-phase flow simulated by air-water provides useful results inexpensively. However, two-phase flow parameters, in particular surface tension and density ratio, are considerably different in air-water than in steam-water. A reasonable compromise is testing in liquid-vapor Freon, which is much closer to steam-water while much simpler experimentally. This paper presents the first results of a series of tests on the vibration behavior of tube bundles subjected to two-phase Freon cross-flow. A rotated triangular tube bundle of tube-to-diameter ratio of 1.5 was tested over a broad range of void fractions and mass fluxes. Fluidelastic instability, random turbulence excitation, and damping were investigated. Well-defined fluidelastic instabilities were observed in continuous two-phase flow regimes. However, intermittent two-phase flow regimes had a dramatic effect on fluidelastic instability. Generally, random turbulence excitation forces are much lower in Freon than in air-water. Damping is very dependent on void fraction, as expected.

Pettigrew, M.J.; Taylor, C.E. [AECL Research, Chalk River, Ontario (Canada). Chalk River Labs.; Jong, J.H.; Currie, I.G. [Univ. of Toronto, Ontario (Canada). Dept. of Mechanical Engineering

1995-11-01T23:59:59.000Z

227

Stockholm Environment Institute (SEI) | Open Energy Information  

Open Energy Info (EERE)

Stockholm Environment Institute (SEI) (Redirected from Stockholm Environment Institute) Jump to: navigation, search Logo: Stockholm Environment Institute Name Stockholm Environment...

228

Hydrogen local vibrational modes in semiconductors  

DOE Green Energy (OSTI)

Following, a review of experimental techniques, theory, and previous work, the results of local vibrational mode (LVM) spectroscopy on hydrogen-related complexes in several different semiconductors are discussed. Hydrogen is introduced either by annealing in a hydrogen ambient. exposure to a hydrogen plasma, or during growth. The hydrogen passivates donors and acceptors in semiconductors, forming neutral complexes. When deuterium is substituted for hydrogen. the frequency of the LVM decreases by approximately the square root of two. By varying the temperature and pressure of the samples, the microscopic structures of hydrogen-related complexes are determined. For group II acceptor-hydrogen complexes in GaAs, InP, and GaP, hydrogen binds to the host anion in a bond-centered orientation, along the [111] direction, adjacent to the acceptor. The temperature dependent shift of the LVMs are proportional to the lattice thermal energy U(T), a consequence of anharmonic coupling between the LVM and acoustical phonons. In the wide band gap semiconductor ZnSe, epilayers grown by metalorganic chemical vapor phase epitaxy (MOCVD) and doped with As form As-H complexes. The hydrogen assumes a bond-centered orientation, adjacent to a host Zn. In AlSb, the DX centers Se and Te are passivated by hydrogen. The second, third, and fourth harmonics of the wag modes are observed. Although the Se-D complex has only one stretch mode, the Se-H stretch mode splits into three peaks. The anomalous splitting is explained by a new interaction between the stretch LVM and multi-phonon modes of the lattice. As the temperature or pressure is varied, and anti-crossing is observed between LVM and phonon modes.

McCluskey, M.D. [Univ. of California, Berkeley, CA (United States). Dept. of Physics]|[Lawrence Berkeley National Lab., CA (United States)

1997-06-01T23:59:59.000Z

229

Generation of laser-induced plasma in supercritical water and vibrational spectroscopic study of accompanying stimulated Raman scattering  

Science Conference Proceedings (OSTI)

We have formed a laser-induced plasma (LIP) in supercritical water (SCW) and studied associated molecular vibrations using spectroscopic methods. The accompanying forward and backward stimulated Raman scattering (SRS) of water molecules showed anisotropic behavior at supercritical conditions (>647 K and >22.1 MPa). The Raman shift of the backward SRS indicated that attractive interactions between water molecules and excess electrons generated by the LIP were dominant in the SCW. The backward SRS spectrum provided a microscopic view of the hydration environment around an excess electron, which is useful for controlling electron-driven chemical reactions and materials processing in SCW.

Yui, Hiroharu [Department of Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka 1-3, Shinjyuku-ku, Tokyo 162-8601 (Japan); PRESTO-JST, Sanbancho 5, Chiyoda-ku, Tokyo 102-0075 (Japan); Tomai, Takaaki; Sawada, Masayoshi; Terashima, Kazuo [Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8561 (Japan)

2011-08-29T23:59:59.000Z

230

Computation of convex bounds for present value functions with random payments  

Science Conference Proceedings (OSTI)

In this contribution we study the distribution of the present value function of a series of random payments in a stochastic financial environment. Such distributions occur naturally in a wide range of applications within fields of insurance and finance. ... Keywords: Black and Scholes model, comonotonicity, convex order, present value functions

Ales Ahcan; Grzegorz Darkiewicz; Marc Goovaerts; Tom Hoedemakers

2006-02-01T23:59:59.000Z

231

Computation of convex bounds for present value functions with random payments  

Science Conference Proceedings (OSTI)

In this contribution we study the distribution of the present value function of a series of random payments in a stochastic financial environment. Such distributions occur naturally in a wide range of applications within fields of insurance and finance. ... Keywords: Black and Scholes model, Comonotonicity, Convex order, Present value functions

Ales Ahcan; Grzegorz Darkiewicz; Marc Goovaerts; Tom Hoedemakers

2006-02-01T23:59:59.000Z

232

Self-Powered Signal Processing Using Vibration-Based Power Generation  

E-Print Network (OSTI)

Low power design trends raise the possibility of using ambient energy to power future digital systems. A chip has been designed and tested to demonstrate the feasibility of operating a digital system from power generated by vibrations in its environment. A moving coil electromagnetic transducer was used as a power generator. Calculations show that power on the order of 400 W can be generated. The test chip integrates an ultra-low power controller to regulate the generator voltage using delay feedback techniques, and a low power subband filter DSP load circuit. Tests verify 500 kHz self-powered operation of the subband filter, a level of performance suitable for sensor applications. The entire system, including the DSP load, consumes 18 W of power. The chip is implemented in a standard 0.8 m CMOS process. A single generator excitation produced 23 ms of valid DSP operation at a 500 kHz clock frequency, corresponding to 11 700 cycles.

Rajeevan Amirtharajah; Anantha P. Chandrakasan

1998-01-01T23:59:59.000Z

233

Settling of loose-fill insulations due to vibration  

SciTech Connect

Vibration and impact testing of loose-fill cellulosic, fiberglass, and rock wool insulations has been carried out to provide a data base for settled density tests. The ratio of final density to initial density for the three materials has been determined for repeated 19-mm (0.75-in.) drops, repeated 152-mm (6.0-in.) drops, and vibrations at frequencies from 10 to 60 Hz with displacements from 0.1 mm (0.004 in.) to 6.35 mm (0.25 in.). Repeated 19-mm or 152-mm drops increased the density ratio for rock wool insulation specimens the most, while the cellulosic insulation specimens were affected the least. Density ratios after 200 19-mm drops averaged 1.75 for loose-fill rock wool, 1.45 for loose-fill fiberglass, and 1.27 for loose-fill cellulosic insulations. Vibration tests for 7200 s at 0.1-mm displacement and 15 Hertz produced negligible changes in the densities of all three loose-fill insulations. An 1800-s vibration test at 2.5 mm (0.1 in.) and 10 Hz resulted in average density ratios of 1.05, 1.11, and 1.18 for specimens of loose-fill cellulosic, rock wool, and fiberglass insulations, respectively. Changes in either frequency of vibration, displacement, or test duration can be used to achieve a wide range of laboratory results. Efforts to correlate laboratory results with in situ density measurements are presented.

Yarbrough, D.W.; McElroy, D.L.; Wright, J.W.

1981-12-01T23:59:59.000Z

234

Settling of loose-fill insulations due to vibration  

SciTech Connect

Vibration and impact testing of loose-fill cellulosic, fiberglass, and rock wool insulations has been carried out to provide a data base for settled density tests. The ratio of final density to initial density for the three materials has been determined for repeated 19-mm (0.75-in.) drops, repeated 152-mm (6.0-in.) drops, and vibrations at frequencies from 10 to 60 Hz with displacements from 0.1 mm (0.004 in.) to 6.35 mm (0.25 in.). Repeated 19-mm or 152-mm drops increased the density ratio for rock wool insulation specimens the most, while the cellulosic insulation specimens were affected the least. Density ratios after 200 19-mm drops averaged 1.75 for loose-fill rock wool, 1.45 for loose-fill fiberglass, and 1.27 for loose-fill cellulosic insulations. Vibration tests for 7200 s at 0.1-mm displacement and 15 Hertz produced negligible changes in the densities of all three loose-fill insulations. An 1800-s vibration test at 2.5 mm (0.1 in.) and 10 Hz resulted in average density ratios of 1.05, 1.11, and 1.18 for specimens of loose-fill cellulosic, rock wool, and fiberglass insulations, respectively. Changes in either frequency of vibration, displacement, or test duration can be used to achieve a wide range of laboratory results. Efforts to correlate laboratory results with in situ density measurements are presented.

Yarbrough, D.W.; Wright, J.H.; McElroy, D.L.; Scanlan, T.F.

1983-01-01T23:59:59.000Z

235

Vibrations of Jammed Disk Packings with Hertzian Interactions  

E-Print Network (OSTI)

Contact breaking and Hertzian interactions between grains can both give rise to nonlinear vibrational response of static granular packings. We perform molecular dynamics simulations at constant energy in 2D of frictionless bidisperse disks that interact via Hertzian spring potentials as a function of energy and measure directly the vibrational response from the Fourier transform of the velocity autocorrelation function. We compare the measured vibrational response of static packings near jamming onset to that obtained from the eigenvalues of the dynamical matrix to determine the temperature above which the linear response breaks down. We compare packings that interact via single-sided (purely repulsive) and double-sided Hertzian spring interactions to disentangle the effects of the shape of the potential from contact breaking. Our studies show that while Hertzian interactions lead to weak nonlinearities in the vibrational behavior (e.g. the generation of harmonics of the eigenfrequencies of the dynamical matrix), the vibrational response of static packings with Hertzian contact interactions is dominated by contact breaking as found for systems with repulsive linear spring interactions.

Carl F. Schreck; Corey S. O'Hern; Mark D. Shattuck

2013-09-03T23:59:59.000Z

236

Quantum random walks with history dependence  

E-Print Network (OSTI)

We introduce a multi-coin discrete quantum random walk where the amplitude for a coin flip depends upon previous tosses. Although the corresponding classical random walk is unbiased, a bias can be introduced into the quantum walk by varying the history dependence. By mixing the biased random walk with an unbiased one, the direction of the bias can be reversed leading to a new quantum version of Parrondo's paradox.

Adrian P. Flitney; Derek Abbott; Neil F. Johnson

2003-11-04T23:59:59.000Z

237

Edison Programming Environment  

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

unless your code in some way relies on the PGI compilers. The default programming environment on Edison uses the Intel compiler suite. Cray and GNU compilers are also available....

238

Severe Convective Wind Environments  

Science Conference Proceedings (OSTI)

Nontornadic thunderstorm winds from long-lived, widespread convective windstorms can have a tremendous impact on human lives and property. To examine environments that support damaging wind producing convection, sounding parameters from Rapid ...

Evan L. Kuchera; Matthew D. Parker

2006-08-01T23:59:59.000Z

239

Development Languages and Environment  

E-Print Network (OSTI)

It combines many of the best features of the standard UNiX working environment like C, sed, awk, csh and sh. Similar to sh and csh, it is used as a scripting ...

240

Environment Feature Stories  

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

Environment Feature Stories Environment Feature Stories /community-environment/_assets/images/icon_earthday.jpg Environment Feature Stories Our environmental stewardship commitment: we will clean up the past, minimize impacts for current environmental operations, and create a sustainable future. Piñon trees show increased susceptibility to drought when also subjected to rising temperatures. Rising global temperatures accelerate drought-induced forest mortality Many southwestern forests in the United States will disappear or be heavily altered by 2050, according to a series of joint LANL-UNM studies. - 7/10/13 Haze of smoke emanating from the 2011 Las Conchas, NM fire. Wildfires may contribute more to global warming than previously predicted They suggest that fire emissions could contribute a lot more to the

Note: This page contains sample records for the topic "random vibration environment" 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.


241

Visualization Design Environment  

SciTech Connect

Improvements in the performance and capabilities of computer software and hardware system, combined with advances in Internet technologies, have spurred innovative developments in the area of modeling, simulation and visualization. These developments combine to make it possible to create an environment where engineers can design, prototype, analyze, and visualize components in virtual space, saving the time and expenses incurred during numerous design and prototyping iterations. The Visualization Design Centers located at Sandia National Laboratories are facilities built specifically to promote the ''design by team'' concept. This report focuses on designing, developing and deploying this environment by detailing the design of the facility, software infrastructure and hardware systems that comprise this new visualization design environment and describes case studies that document successful application of this environment.

Pomplun, A.R.; Templet, G.J.; Jortner, J.N.; Friesen, J.A.; Schwegel, J.; Hughes, K.R.

1999-02-01T23:59:59.000Z

242

Interactive collaborative media environments  

Science Conference Proceedings (OSTI)

Virtual reality (VR) provides a revolutionary interface between man and machine. However, present display and interface peripherals limit the potential of virtual environments within many activities or scenarios. Mainstream immersive VR is centred on ...

D. M. Traill; J. D. Bowshill; P. J. Lawrence

1997-10-01T23:59:59.000Z

243

Environment induced incoherent controllability  

E-Print Network (OSTI)

We prove that the environment induced entanglement between two non interacting, two-dimensional quantum systems S and P can be used to control the dynamics of S by means of the initial state of P. Using a simple, exactly solvable model, we show that both accessibility and controllability of S can be achieved under suitable conditions on the interaction of S and P with the environment.

Raffaele Romano; Domenico D'Alessandro

2005-11-08T23:59:59.000Z

244

Machine Learning Benchmarks and Random Forest Regression  

E-Print Network (OSTI)

Machine Learning Benchmarks and Random Forest Regressionerror on a suite of benchmark datasets. As the basethe Machine Learning Benchmark Problems package; see http://

Segal, Mark R

2004-01-01T23:59:59.000Z

245

Discriminant Random Forest (DRF) Classification Methodology  

Jupiter Laser Facility. ... State-of-the-art methodologies that perform this type of classification include Support Vector Machines, Neural Networks, and Random Forest.

246

On Generating Random Network Structures: Connected Graphs  

Science Conference Proceedings (OSTI)

are presented for random generation of connected graphs, sugraphs (sub- graphs on the ... a distribution and take it into account at estimation. Attainability is ...

247

BIASED RANDOM-KEY GENETIC ALGORITHMS WITH ...  

E-Print Network (OSTI)

Handbook of Metaheuristics. Kluwer. Academic Publishers, 2003. J.F. Gonçalves and M.G.C. Resende. Biased random-key genetic algorithms for combinatorial ...

248

Dynamic Random Networks in Dynamic Populations  

Science Conference Proceedings (OSTI)

Mar 24, 2010 ... Springer Science+Business Media, LLC 2010. Abstract We ...... Turova, T.S.: Continuity of the percolation threshold in randomly grown graphs.

249

High order Parzen windows and randomized sampling.  

E-Print Network (OSTI)

???In the thesis, high order Parzen windows are studied for understanding some algorithms in learning theory and randomized sampling in multivariate approximation. Our ideas are… (more)

Zhou, Xiangjun (???)

2009-01-01T23:59:59.000Z

250

From quantum graphs to quantum random walks  

E-Print Network (OSTI)

We give a short overview over recent developments on quantum graphs and outline the connection between general quantum graphs and so-called quantum random walks.

Gregor Tanner

2005-04-29T23:59:59.000Z

251

?1 Minimization via Randomized First Order Algorithms  

E-Print Network (OSTI)

In this paper we propose randomized first-order algorithms for solving bilinear ...... does not require knowledge of ?) is not worse that the “theoretically optimal” ...

252

Sums of Random Symmetric Matrices and Applications  

E-Print Network (OSTI)

Let Bi be deterministic symmetric m × m matrices, and ?i be independent random ...... The latter means that every component ?xk of ?x satisfies the orthogonality ...

253

Lattice vibrations of pure and doped GaSe  

Science Conference Proceedings (OSTI)

The Bridgman method is used to grow especially undoped and doped single crystals of GaSe. Composition and impurity content of the grown crystals were determined using X-ray fluorescence (XRF) method. X-ray diffraction, Raman scattering, photoluminescence (PL), and IR transmission measurements were performed at room temperature. The long wavelength lattice vibrations of four modifications of GaSe were described in the framework of modified one-layer linear-chain model which also takes into consideration the interaction of the selenium (Se) atom with the second nearest neighbor gallium (Ga) atom in the same layer. The existence of an eight-layer modification of GaSe is suggested and the vibrational frequencies of this modification are explained in the framework of a lattice dynamical model considered in the present work. Frequencies and the type of vibrations (gap, local, or resonance) for the impurity atoms were calculated and compared with the experimental results.

Allakhverdiev, K. [Materials Institute, Marmara Research Center, TUBITAK, Gebze/Kocaeli 41470 (Turkey) and Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143 (Azerbaijan)]. E-mail: kerim.allahverdi@mam.gov.tr; Baykara, T. [Materials Institute, Marmara Research Center, TUBITAK, Gebze/Kocaeli 41470 (Turkey); Ellialtioglu, S. [Department of Physics, Middle East Technical University, Ankara 06531 (Turkey); Hashimzade, F. [Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143 (Azerbaijan); Huseinova, D. [Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143 (Azerbaijan); Kawamura, K. [Institute of Materials Science, University of Tsukuba 305-8573 (Japan); Kaya, A.A. [Materials Institute, Marmara Research Center, TUBITAK, Gebze/Kocaeli 41470 (Turkey); Kulibekov, A.M. [Department of Physics, Mugla University, Mugla 48000 (Turkey); Onari, S. [Institute of Materials Science, University of Tsukuba 305-8573 (Japan)

2006-04-13T23:59:59.000Z

254

Non-linear optical crystal vibration sensing device  

SciTech Connect

A non-linear optical crystal vibration sensing device (10) including a photorefractive crystal (26) and a laser (12). The laser (12 ) produces a coherent light beam (14) which is split by a beam splitter (18) into a first laser beam (20) and a second laser beam (22). After passing through the crystal (26) the first laser beam (20) is counter-propagated back upon itself by a retro-mirror (32), creating a third laser beam (30). The laser beams (20, 22, 30) are modulated, due to the mixing effect within the crystal (26) by vibration of the crystal (30). In the third laser beam (30), modulation is stable and such modulation is converted by a photodetector (34) into a usable electrical output, intensity modulated in accordance with vibration applied to the crystal (26).

Kalibjian, Ralph (Livermore, CA)

1994-01-11T23:59:59.000Z

255

Non-linear optical crystal vibration sensing device  

DOE Patents (OSTI)

The report describes a non-linear optical crystal vibration sensing device including a photorefractive crystal and a laser. The laser produces a coherent light beam which is split by a beam splitter into a first laser beam and a second laser beam. After passing through the crystal the first laser beam is counter-propagated back upon itself by a retro-mirror, creating a third laser beam . The laser beams are modulated, due to the mixing effect within the crystal by vibration of the crystal. In the third laser beam modulation is stable and such modulation is converted by a photodetector into a usable electrical output, intensity modulated in accordance with vibration applied to the crystal.

Kalibjian, R.

1992-12-31T23:59:59.000Z

256

High-vibration detection using motor current signature analysis  

Science Conference Proceedings (OSTI)

Motor current signature analysis (CSA) has been used for several years as a diagnostic tool for electrical problems in ac, induction motors. Personnel at Oak Ridge National Laboratory have found that CSA can also provide information about system vibrations and imbalances similar to the information provided by an accelerometer. As a result, CSA techniques for monitoring the status of the equipment, such as pumps and compressors, driven by induction motors have been developed and used in dedicated monitoring systems. In this work, researchers have found that CSA responds proportionately to imbalances in rotating equipment and can be used to detect the In high-vibration conditions that can result. This report describes how vibration monitoring with CSA can be implemented and presents test data to support that use.

Castleberry, K.N.

1996-08-01T23:59:59.000Z

257

Low Head, Vortex Induced Vibrations River Energy Converter  

DOE Green Energy (OSTI)

Vortex Induced Vibrations Aquatic Clean Energy (VIVACE) is a novel, demonstrated approach to extracting energy from water currents. This invention is based on a phenomenon called Vortex Induced Vibrations (VIV), which was first observed by Leonardo da Vinci in 1504AD. He called it ‘Aeolian Tones.’ For decades, engineers have attempted to prevent this type of vibration from damaging structures, such as offshore platforms, nuclear fuel rods, cables, buildings, and bridges. The underlying concept of the VIVACE Converter is the following: Strengthen rather than spoil vortex shedding; enhance rather than suppress VIV; harness rather than mitigate VIV energy. By maximizing and utilizing this unique phenomenon, VIVACE takes this “problem” and successfully transforms it into a valuable resource for mankind.

Bernitsas, Michael B.; Dritz, Tad

2006-06-30T23:59:59.000Z

258

Memory in the system: trajectory-environment  

E-Print Network (OSTI)

In the paper the memory effect in the system consisting from a trajectory of process and an environment is considered. The environment is presented by scalar potential and noise. The evolution of system is interpreted as process of the continuous "measurement" of a trajectory by an environment and\\or on the contrary. In this sense the measured value is entropy-the information about embedding of the trajectory into configurations space. The concepts "measurement" and "interaction" are identified alike in quantum theory. Thus, the entropy evolution is not only the effect of dynamics, but also its cause, if it is possible to speak about causality in this case. It is shown, that such non-elastic interaction leads to occurrence of memory in the system. The reflex memory mechanism is realized as a real conformal dynamic metrics. The metastable event (attractor) is defined and time of its life is estimated. It is shown, that in the system there is a change of dynamic modes from spatial localization to random walk (fluctuation, relaxation). On scale of the attractors dynamics the memory is appearing as a semi-regular (in some information sense) drift of the image of fluctuations in a power spectrum of environment to absolute minimum. The latter properties (topological convergence) attract the attention to algorithmic aspect of a considered system.

Maxim Budaev

2007-08-10T23:59:59.000Z

259

Vibration Combined High Temperature Cycle Tests for Capacitive MEMS Accelerometers  

E-Print Network (OSTI)

In this paper vibration combined high temperature cycle tests for packaged capacitive SOI-MEMS accelerometers are presented. The aim of these tests is to provide useful Design for Reliability information for MEMS designers. A high temperature test chamber and a chopper-stabilized read-out circuitry were designed and realized at BME - DED. Twenty thermal cycles of combined Temperature Cycle Test and Fatigue Vibration Test has been carried out on 5 samples. Statistical evaluation of the test results showed that degradation has started in 3 out of the 5 samples.

Szucs, Z; Hodossy, S; Rencz, M; Poppe, A

2008-01-01T23:59:59.000Z

260

Vibration Combined High Temperature Cycle Tests for Capacitive MEMS Accelerometers  

E-Print Network (OSTI)

In this paper vibration combined high temperature cycle tests for packaged capacitive SOI-MEMS accelerometers are presented. The aim of these tests is to provide useful Design for Reliability information for MEMS designers. A high temperature test chamber and a chopper-stabilized read-out circuitry were designed and realized at BME - DED. Twenty thermal cycles of combined Temperature Cycle Test and Fatigue Vibration Test has been carried out on 5 samples. Statistical evaluation of the test results showed that degradation has started in 3 out of the 5 samples.

Z. Szucs; G. Nagy; S. Hodossy; M. Rencz; A. Poppe

2008-01-07T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

The Modeling of Vibration Damping in SMA Wires  

SciTech Connect

Through a mathematical and computational model of the physical behavior of shape memory alloy wires, this study shows that localized heating and cooling of such materials provides an effective means of damping vibrational energy. The thermally induced pseudo-elastic behavior of a shape memory wire is modeled using a continuum thermodynamic model and solved computationally as described by the authors in [23]. Computational experiments confirm that up to 80% of an initial shock of vibrational energy can be eliminated at the onset of a thermally-induced phase transformation through the use of spatially-distributed transformation regions along the length of a shape memory alloy wire.

Reynolds, D R; Kloucek, P; Seidman, T I

2003-09-16T23:59:59.000Z

262

System and method for damping vibration in a drill string  

DOE Patents (OSTI)

A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

Wassell, Mark Ellsworth (Kingwood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

2011-08-16T23:59:59.000Z

263

System and method for damping vibration in a drill string  

DOE Patents (OSTI)

A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

Wassell, Mark Ellsworth (Kingwood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

2008-05-27T23:59:59.000Z

264

System and method for damping vibration in a drill string  

DOE Patents (OSTI)

A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

Wassell, Mark Ellsworth (Kingwood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

2007-05-22T23:59:59.000Z

265

System and method for damping vibration in a drill string  

Science Conference Proceedings (OSTI)

A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

Wassell, Mark Ellsworth (Kingswood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

2012-08-14T23:59:59.000Z

266

On Gaussian Random Measures Generated by Empirical Distributions of Independent Random Variables  

E-Print Network (OSTI)

Normalized fluctuations of empirical measures converge to a law of a random measure if and only if the underlying random variable is purely discrete with square-root-summable probabilities. 1

unknown authors

1994-01-01T23:59:59.000Z

267

Non-intrusive vibration monitoring in US Naval and US Coast Guard ships  

E-Print Network (OSTI)

In 2011, the Laboratory for Electromagnetic and Electronic Systems proposed a new type of vibration monitoring system, entitled vibration assessment monitoring point with integrated recovery of energy or VAMPRIE, in their ...

Gerhard, Katherine Leigh

2013-01-01T23:59:59.000Z

268

Parameter Identification of Vibration Loads of Hydro Generator Using Neural Networks  

Science Conference Proceedings (OSTI)

Abstract Abstract Abstract Vibrating dynamic characteristics have been a major unknown in the modeling and mechanical analysis of large hydro generators. An identification algorithm for vibrating dynamic characterization by using artificial neural network ...

Lijuan Cao; Shouju Li; Zichang Shangguan

2008-06-01T23:59:59.000Z

269

Theory and Techniques for Vibration-Induced Conductivity Fluctuation testing of Soils  

E-Print Network (OSTI)

First we present and theoretically analyze the phenomenological physical picture behind Vibration-Induced Conductivity Fluctuations. We identify the relevant tensors characterizing the electromechanical response against the vibrations for both longitudinal and transversal responses. We analyze the conductivity response with acceleration type vibrations and a new scheme, measurements with more advantageous compression type vibrations that are first introduced here. Compression vibrations provide sideband spectral lines shifted by the frequency of the vibration instead of its second harmonics; moreover the application of this method is less problematic with loose electrodes. Concerning geometry and electrodes, the large measurement errors in earlier experiment indicated electrode effects which justify using four-electrode type measurements. We propose and analyze new arrangements for the longitudinal and transversal measurements with both compression vibration and acceleration vibration for laboratory and field conditions.

Hung-Chih Chang; Laszlo B. Kish; Andrea Kishne; Cristine Morgan; Chiman Kwan

2009-01-22T23:59:59.000Z

270

Analysis of Supercooled Liquid Water Measurements Using Microwave Radiometer and Vibrating Wire Devices  

Science Conference Proceedings (OSTI)

A review is made of the theoretical basis for using a vibrating wire to measure supercooled liquid water in clouds. The device consists of a vibrating wire and associated electronics added to radiosondes. The sensing wire that collects ...

Geoffrey E. Hill

1994-10-01T23:59:59.000Z

271

Capture Effect of Randomly Addressed Polling Protocol  

Science Conference Proceedings (OSTI)

The capture effect, discussed in this paper, is generally considered to enhance the system‘s performance in a wireless network. This paper also considers the Randomly Addressed Polling (RAP) protocol in the presence of a fading mobile radio ... Keywords: capture effect, noiseless, randomly addressed polling protocol

Jiang-Whai Dai

1999-06-01T23:59:59.000Z

272

Gas Turbine Fault Diagnosis using Random Forests  

Science Conference Proceedings (OSTI)

In the present paper, Random Forests are used in a critical and at the same time non trivial problem concerning the diagnosis of Gas Turbine blading faults, portraying promising results. Random forests-based fault diagnosis is treated as a Pattern Recognition ...

Manolis Maragoudakis; Euripides Loukis; Panayotis-Prodromos Pantelides

2008-06-01T23:59:59.000Z

273

All that jazz in the random forest  

Science Conference Proceedings (OSTI)

In this paper, we address the problem of automatic identification of instruments in audio records, in a frame-by-frame manner. Random forests have been chosen as a classifier. Training data represent sounds of selected instruments which originate from ... Keywords: music information retrieval, random forests, sound recognition

El?bieta Kubera; Miron B. Kursa; Witold R. Rudnicki; Rados?aw Rudnicki; Alicja A. Wieczorkowska

2011-06-01T23:59:59.000Z

274

Discriminative sentence compression with conditional random fields  

Science Conference Proceedings (OSTI)

The paper focuses on a particular approach to automatic sentence compression which makes use of a discriminative sequence classifier known as Conditional Random Fields (CRF). We devise several features for CRF that allow it to incorporate information ... Keywords: Conditional random fields, Machine learning, Natural language syntax, RSS, Sentence compression, Sequence alignment

Tadashi Nomoto

2007-11-01T23:59:59.000Z

275

Random oracles in a quantum world  

Science Conference Proceedings (OSTI)

The interest in post-quantum cryptography -- classical systems that remain secure in the presence of a quantum adversary -- has generated elegant proposals for new cryptosystems. Some of these systems are set in the random oracle model and are proven ... Keywords: encryption, quantum, random oracle, signatures

Dan Boneh; Özgür Dagdelen; Marc Fischlin; Anja Lehmann; Christian Schaffner; Mark Zhandry

2011-12-01T23:59:59.000Z

276

GEMS in the environment  

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

GEMS in the environment GEMS in the environment Name: de tar Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: How many years will it be before Genetically Engineered Microorganisms are released into the environment? Replies: Some already have been in controlled and government-approved tests. So have some non-micro organisms, mainly some food crop plants and cattle strains. moodywj In addition to the previous response, I might add that although there are several examples of GEMS which have been released for beneficial purposes, caution must be exercised in order that a potentially harmful organism does not escape into the environment without extremely careful supervision and complete control over its spread. An example of this is the engineered bacteria which make use of crude oil as a carbon source, patented for use on oil spills. Although spraying a solution with these organisms in it can help clean up spills and decrease the OIL'S impact on the environment, you have to be careful about knowing in advance what the organisms will turn to for food once the oil is gone -- will it attack the hydrocarbons of other living organisms?

277

Biased Games On Random Boards  

E-Print Network (OSTI)

In this paper we analyze biased Maker-Breaker games and Avoider-Enforcer games, both played on the edge set of a random board G ? G(n, p). In Maker-Breaker games there are two players, denoted by Maker and Breaker. In each round, Maker claims one previously unclaimed edge of G and Breaker responds by claiming b previously unclaimed edges. We consider the Hamiltonicity game, the perfect matching game and the k-vertexconnectivity game, where Maker’s goal is to build a graph which possesses the relevant property. Avoider-Enforcer games are the reverse analogue of Maker-Breaker games with a slight modification, where the two players claim at least 1 and at least b previously unclaimed edges per move, respectively, and Avoider aims to avoid building a graph which possesses the relevant property. Maker-Breaker games are known to be “bias-monotone”, that is, if Maker wins the (1, b) game, he also wins the (1, b ? 1) game. Therefore, it makes sense to define the critical bias of a game, b ? , to be the “breaking point ” of the game. That is, Maker wins the (1, b) game whenever b ? b ? and loses otherwise. An analogous definition of the critical bias exists for Avoider-Enforcer games: here, the critical bias of a game b ? is such that Avoider wins the (1, b) game for every b> b ? , and loses otherwise. ln n We prove that, for every p = ?( n), G ? G(n, p) is typically such that the critical bias for all the aforementioned Maker-Breaker games is asymptotically b ? = np ln n. We also ln n prove that in the case p = ?( n), the critical bias is b ? = ? ( np ln n). These results settle a conjecture of Stojakovi? and Szabó. For Avoider-Enforcer games, we prove that for p = ?( ln n n), the critical bias for all the aforementioned games is b ? = ? ( np ln n). 1

Asaf Ferber; Roman Glebov; Michael Krivelevich; Alon Naor

2012-01-01T23:59:59.000Z

278

Vibration and crack detection in gas turbine engine compressor blades using Eddy current sensors  

E-Print Network (OSTI)

(cont.) in the ECS signal, no definitive method for sensing blade vibration using an ECS has yet been developed.

Lackner, Matthew, 1980-

2004-01-01T23:59:59.000Z

279

United Nations Environment Programme: Global Environment Outlook | Open  

Open Energy Info (EERE)

Nations Environment Programme: Global Environment Outlook Nations Environment Programme: Global Environment Outlook Jump to: navigation, search Tool Summary Name: United Nations Environment Programme: Global Environment Outlook Agency/Company /Organization: United Nations Environment Programme Topics: Co-benefits assessment, Policies/deployment programs, Resource assessment, Pathways analysis Resource Type: Dataset, Maps Website: geodata.grid.unep.ch/ United Nations Environment Programme: Global Environment Outlook Screenshot References: UNEP Data[1] Overview "The GEO Data Portal is the authoritative source for data sets used by UNEP and its partners in the Global Environment Outlook (GEO) report and other integrated environment assessments. Its online database holds more than 500 different variables, as national, subregional, regional and global

280

NERSC User Environment  

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

Environment Environment NERSC User Environment Home Directories, Shells and Startup Files All NERSC systems (except PDSF) use global home directories, which are are pre-populated with startup files (also known as dot files) for all available shells. NERSC fully supports bash, csh, and tcsh as login shells. Other shells (ksh, sh, and zsh) are also available. The default shell at NERSC is csh. Changing Your Default Login Shell Use the NERSC Information management (NIM) portal if you want to to change your default login shell. To do this, select Change Shell from the NIM Actions pull-down menu. Managing Your Startup Files The "standard" dot-files are symbolic links to read-only files that NERSC controls. For each standard dot-file, there is a user-writable ".ext" file.

Note: This page contains sample records for the topic "random vibration environment" 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

Environment/Health/Safety (EHS)  

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

Environment, Safety and Health Standards Set for LBNL Environment, Safety and Health Standards Set for LBNL Due to a recent Contract 31 action, the Necessary and Sufficient process...

282

Free Vibration Analysis of Kirchoff Plates with Damaged Boundaries by the Chebyshev Collocation Method  

E-Print Network (OSTI)

Free Vibration Analysis of Kirchoff Plates with Damaged Boundaries by the Chebyshev Collocation for the free vibration analysis of slender Kirchoff plates with both mixed and damaged boundaries an important role in applications of mechanical, aerospace and civil engineering. Studying the free vibration

Butcher, Eric A.

283

Steam Turbine-Generator Torsional Vibration Interaction With the Electrical Network  

Science Conference Proceedings (OSTI)

This Tutorial Report deals with steam turbine-generator torsional vibration arising from interaction with the electrical systems that connect to the generator. Besides providing background material on torsional vibration and fatigue, it reviews operating experience and machine torsional duty mitigation strategies and provides information on torsional vibration measurement, monitoring, diagnostic procedures, and non-destructive evaluation (NDE).

2005-11-14T23:59:59.000Z

284

Laboratory Calibration of a Vibrating Wire Device for Measuring Concentrations of Supercooled Liquid Water  

Science Conference Proceedings (OSTI)

Laboratory measurements of supercooled liquid water are made by a vibrating-wire sensor whose frequency of vibration varies according to the mass of ice collected on it. The vibrating-wire system is designed to be placed in the humidity duct of ...

Geoffrey E. Hill

1989-12-01T23:59:59.000Z

285

Vibrationally resolved transitions in ion-molecule and atom-molecular ion slow collisions  

DOE Data Explorer (OSTI)

The data tables and interactive graphs made available here contain theoretical integral cross sections for vibrational excitation and vibrationally resolved charge transfer from vibrationally excited states of H2 and H2+ with protons and hydrogen atoms, respectively. [From http://www-cfadc.phy.ornl.gov/h2mol/home.html] (Specialized Interface)

286

Environment scattering in GADRAS.  

SciTech Connect

Radiation transport calculations were performed to compute the angular tallies for scattered gamma-rays as a function of distance, height, and environment. Green's Functions were then used to encapsulate the results a reusable transformation function. The calculations represent the transport of photons throughout scattering surfaces that surround sources and detectors, such as the ground and walls. Utilization of these calculations in GADRAS (Gamma Detector Response and Analysis Software) enables accurate computation of environmental scattering for a variety of environments and source configurations. This capability, which agrees well with numerous experimental benchmark measurements, is now deployed with GADRAS Version 18.2 as the basis for the computation of scattered radiation.

Thoreson, Gregory G.; Mitchell, Dean James; Theisen, Lisa Anne; Harding, Lee T.

2013-09-01T23:59:59.000Z

287

Blasting Vibration Signals Based on Hilbert Transformation of the Application  

Science Conference Proceedings (OSTI)

This paper is based on empirical mode decomposition (EMD )of Hilbert-Huang transform (Hilbert-Huang Transformation, HHT) method shall be applied to the blasting vibration signal, first introduced the Hilbert-Huang transform theory and algorithms, then ... Keywords: Blast, Hilbert-Huang transform, seismic wave, frequency spectrogram

Xueping Ren; Dongsheng Hao

2012-04-01T23:59:59.000Z

288

Vibration-Assisted Electron Tunneling in C140 Transistors  

E-Print Network (OSTI)

We measure electron tunneling in transistors made from C140, a molecule with a mass?spring?mass geometry chosen as a model system to study electron-vibration coupling. We observe vibration-assisted tunneling at an energy corresponding to the stretching mode of C140. Molecular modeling provides explanations for why this mode couples more strongly to electron tunneling than to the other internal modes of the molecule. We make comparisons between the observed tunneling rates and those expected from the Franck?Condon model. When electrons travel through molecules, vibrational modes of the molecules can affect current flow. Molecular-vibrationassisted tunneling was first measured in the 1960s using devices whose tunnel barriers contained many molecules. 1 Recently, effects of vibrations in single molecules have been measured using scanning tunneling microscopes, 2 singlemolecule transistors, 3,4 and mechanical break junctions. 5 Theoretical considerations suggest that different regimes may exist depending on whether tunneling electrons occupy resonant energy levels on the molecule, and also on the * Corresponding author.

A. N. Pasupathy; J. Park; C. Chang; A. V. Soldatov; S. Lebedkin; R. C. Bialczak; J. E. Grose; L. A. K. Donev; J. P. Sethna; D. C. Ralph; P. L. Mceuen

2004-01-01T23:59:59.000Z

289

Vibration damping and heat transfer using material phase changes  

SciTech Connect

A method and apparatus wherein phase changes in a material can dampen vibrational energy, dampen noise and facilitate heat transfer. One embodiment includes a method for damping vibrational energy in a body. The method comprises attaching a material to the body, wherein the material comprises a substrate, a shape memory alloy layer, and a plurality of temperature change elements. The method further comprises sensing vibrations in the body. In addition, the method comprises indicating to at least a portion of the temperature change elements to provide a temperature change in the shape memory alloy layer, wherein the temperature change is sufficient to provide a phase change in at least a portion of the shape memory alloy layer, and further wherein the phase change consumes a sufficient amount of kinetic energy to dampen at least a portion of the vibrational energy in the body. In other embodiments, the shape memory alloy layer is a thin film. Additional embodiments include a sensor connected to the material.

Kloucek, Petr (Houston, TX); Reynolds, Daniel R. (Oakland, CA)

2009-03-24T23:59:59.000Z

290

Vibration-based terrain classification for electric powered wheelchairs  

Science Conference Proceedings (OSTI)

Automated terrain classification for electric powered wheelchairs (EPWs) has two primary motivations. First, certain terrains (e.g., sand and gravel) make wheelchair mobility more difficult. To alleviate this problem the wheelchair control system can ... Keywords: advanced wheelchair systems, electric powered wheelchairs, terrain classification, vibrations

Eric Coyle; Emmanuel G. Collins, Jr.; Edmond DuPont; Dan Ding; Hongwu Wang; Rory A. Cooper; Garrett Grindle

2008-04-01T23:59:59.000Z

291

Different Network Topologies for Distributed Electric Damping of Beam Vibrations  

E-Print Network (OSTI)

In this work passive electric damping of structural vibrations by distributed piezoelectric transducers and electric networks is analyzed. Different distributed electric controllers are examined as finite degrees of freedom systems and their performances are compared. Modal reduction is used to optimize the electric parameters

Porfiri, M; dell'Isola, F; Pouget, J

2010-01-01T23:59:59.000Z

292

Different Network Topologies for Distributed Electric Damping of Beam Vibrations  

E-Print Network (OSTI)

In this work passive electric damping of structural vibrations by distributed piezoelectric transducers and electric networks is analyzed. Different distributed electric controllers are examined as finite degrees of freedom systems and their performances are compared. Modal reduction is used to optimize the electric parameters

M. Porfiri; C. Maurini; F. dell'Isola; J. Pouget

2010-09-25T23:59:59.000Z

293

Grinding media oscillation: effect on torsional vibrations in tumble mills  

E-Print Network (OSTI)

Tumble mills are hollow cylindrical shells of large diameter carrying grinding media (a combination of rock/iron ore/chemical flakes and metal balls/rods), which, upon rotation of the mill, will be ground into fine powder. These mills rotate at low speeds using a gear reduction unit and often have vibration problems. These vibration problems result in increased gear wear and occasional catastrophic failures resulting in production loss. The objective of this research is to investigate the effect of oscillation of grinding media on torsional vibrations of the mill. A theoretical model was developed to determine the oscillating frequency of the grinding media. A 12" (0.3 m) diameter tumble mill test rig was built with a 0.5 hp DC motor. The rig is tested with sand and iron bb balls to simulate the industry process application. At low volume levels the grinding media oscillates like a rigid body as compared to higher volumes. It is shown that tumbling action of grinding media causes torsional excitation and hence its effect has to be considered in torsional vibration analysis. At starting, the load on the gears is much higher due to this oscillation.

Toram, Kiran Kumar

2005-08-01T23:59:59.000Z

294

Vibration-based MEMS Piezoelectric Energy Harvester for Power Optimization  

Science Conference Proceedings (OSTI)

The simplicity associated with piezoelectric micro-generators makes them very attractive for MEMS applications in which ambient vibrations are harvested and converted into electric energy. These micro-generators can become an alternative to the battery-based ... Keywords: Piezoelectric materials, Energy conversion, shaped cantilever, MEMS

Othman Sidek, Salem Saadon

2013-04-01T23:59:59.000Z

295

Flow-induced vibration of circular cylindrical structures  

SciTech Connect

This report summarizes the flow-induced vibration of circular cylinders in quiescent fluid, axial flow, and crossflow, and applications of the analytical methods and experimental data in design evaluation of various system components consisting of circular cylinders. 219 figs., 30 tabs. (JDB)

Chen, S.S.

1985-06-01T23:59:59.000Z

296

Geoscience/Environment  

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

Geoscience/Environment Geoscience/Environment Geoscience/Environment Print From the high pressures at the Earth's core to the vacuum of outer space, the ALS has tools for investigating samples from either environmental extreme. "Geoscience" at the ALS covers a wide range of topics, from carbon sequestration and air quality to cometary composition and the formation of the solar system. To narrow the focus a bit, the ALS has an important role to play in addressing a number of environmental issues, including environmental remediation, hazardous-waste management, global climate change, agricultural sustainability, and trace-element cycling in ecosystems. These problems present major scientific challenges, in part because natural systems are extremely complex at a range of scales. Moreover, the behavior of these systems is determined by a complex interplay of chemical, physical, and biological processes in spatially heterogeneous environments. The ALS can contribute to the knowledge base needed to address a variety of environmental issues by enabling a variety of investigations, including analytical chemistry, microscopy of heterogeneous media, and reaction kinetics in natural systems.

297

Environment analysis via ?CFA  

Science Conference Proceedings (OSTI)

We describe a new program-analysis framework, based on CPS and procedure-string abstractions, that can handle critical analyses which the k-CFA framework cannot. We present the main theorems concerning correctness, show an application analysis, ... Keywords: CPS, continuations, delta-CFA, environment analysis, flow analysis, functional languages, inlining, lambda calculus, program analysis, super-beta

Matthew Might; Olin Shivers

2006-01-01T23:59:59.000Z

298

Thermolysis of (1R,2R)-1,2-dideuteriocyclobutane. An application of vibrational circular dichroism to kinetic analysis  

SciTech Connect

The relative rates of geometric isomerization to racemization have been studied for the title compound by using a combination of infrared (IR) and vibrational circular dichroism (VCD) spectroscopies, respectively. The results are interpreted with a kinetic and mechanistic scheme which parallels that used by Berson, Pedersen, and Carpenter on a similar study of chiral cyclopropane-d/sub 2/ thermolysis. Relative rates of isomerization to stereomutation of 1.5 +/- 0.4 were obtained which can be interpreted to be consistent with a mechanism best described by random methylene rotation in tetramethylene-d/sub 2/. This is the first application of VCD to kinetic analysis, and the advantages of IR techniques over the more usually employed UV spectroscopies to this type of basic mechanistic problem are illustrated.

Chickos, J.S.; Annamalai, A.; Keiderling, T.A.

1986-07-23T23:59:59.000Z

299

DAVE, Data Analysis and Visualization Environment  

Science Conference Proceedings (OSTI)

... It also allows the animation of the vibrational modes of the molecule to be seen (or saved). MARS Data Reduction. Menu ...

300

Flow-induced vibration in LMFBR steam generators: a state-of-the-art review  

SciTech Connect

This state-of-the-art review identifies and discusses existing methods of flow-induced vibration analysis applicable to steam generators, their limitations, and base-technology needs. Also included are discussions of five different LMFBR steam-generator configurations and important design considerations, failure experiences, possible flow-induced excitation mechanisms, vibration testing, and available methods of vibration analysis. The objectives are to aid LMFBR steam-generator designers in making the best possible evaluation of potential vibration in steam-generator internals, and to provide the basis for development of design guidelines to avoid detrimental flow-induced vibration. (auth)

Shin, Y.S.; Wambsganss, M.W.

1975-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Enhanced Elasticity and Soft Glassy Rheology of a Smectic in a Random Porous Environment  

E-Print Network (OSTI)

We report studies of the frequency dependent shear modulus, $G^*(\\omega)=G'(\\omega)+iG''(\\omega)$, of the liquid crystal octylcyanobiphenyl (8CB) confined in a colloidal aerosil gel. With the onset of smectic order, $G'$ grows approximately linearly with decreasing temperature, reaching values that exceed by more than three orders of magnitude the values for pure 8CB. The modulus at low temperatures possesses a power-law component, $G^*(\\omega) \\sim \\omega^\\alpha$, with exponent $\\alpha$ that approaches zero with increasing gel density. The amplitude of $G'$ and its variation with temperature and gel density indicate that the low temperature response is dominated by a dense population of defects in the smectic. In contrast, when the 8CB is isotropic or nematic, the modulus is controlled by the elastic behavior of the colloidal gel.

Ranjini Bandyopadhyay; Dennis Liang; Ralph H. Colby; James L. Harden; Robert L. Leheny

2005-02-18T23:59:59.000Z

302

Randomized data allocation in scalable streaming architectures  

Science Conference Proceedings (OSTI)

IP-networked streaming media storage has been increasingly used as a part of many applications. Random placement of data blocks has been proven to be an effective approach to balance heterogeneous workload in multi-disk steaming architectures. However, ...

Kun Fu; Roger Zimmermann

2005-04-01T23:59:59.000Z

303

Unsupervised image segmentation using markov random fields  

Science Conference Proceedings (OSTI)

In this study, we carried out an unsupervised gray level image segmentation based on Markov Random Fields (MRF) model. First, we use the Expectation Maximization (EM) algorithm to estimate the distribution of the input image and the number of ...

Abdulkadir ?engür; ?brahim Türko?lu; M. Cevdet ?nce

2005-06-01T23:59:59.000Z

304

Generating "dependent" quasi-random numbers  

Science Conference Proceedings (OSTI)

Under certain conditions on the integrand, quasi-Monte Carlo methods for estimating integrals (expectations) converge faster asymptotically than Monte Carlo methods. Motivated by this result we consider the generation of quasi-random vectors with given ...

Shane G. Henderson; Belinda A. Chiera; Roger M. Cooke

2000-12-01T23:59:59.000Z

305

Quasi-random array imaging collimator  

DOE Patents (OSTI)

A hexagonally shaped quasi-random no-two-holes-touching imaging collimator. The quasi-random array imaging collimator eliminates contamination from small angle off-axis rays by using a no-two-holes-touching pattern which simultaneously provides for a self-supporting array increasing throughput by elimination of a substrate. The present invention also provides maximum throughput using hexagonally shaped holes in a hexagonal lattice pattern for diffraction limited applications. Mosaicking is also disclosed for reducing fabrication effort.

Fenimore, E.E.

1980-08-20T23:59:59.000Z

306

QCD, Symmetry Breaking and the Random Lattice  

E-Print Network (OSTI)

According to the Nielsen-Ninomiya No-Go theorem, the doubling of fermions on the lattice cannot be suppressed in a chiral theory. Whereas Wilson and staggered fermions suppress doublers with explicit breaking of chiral symmetry, the random lattice does so by spontaneous chiral symmetry breaking even in the free theory. I present results for meson masses, the chiral condensate and fermionic eigenvalues from simulations of quenched QCD on random lattices in four dimensions, focusing on chiral symmetry breaking. 1.

Saul D. Cohen A

2006-01-01T23:59:59.000Z

307

Forecasting Random Walks Under Drift Instability  

E-Print Network (OSTI)

Forecasting Random Walks Under Drift Instability? M. Hashem Pesaran University of Cambridge, CIMF, and USC Andreas Pick University of Cambridge, CIMF March 11, 2008 Abstract This paper considers forecast averaging when the same model is used... but estimation is carried out over different estimation windows. It develops theoretical results for random walks when their drift and/or volatility are subject to one or more structural breaks. It is shown that compared to using forecasts based on a single...

Pesaran, M Hashem; Pick, Andreas

308

Nanomanufacturing of random branching material architectures  

Science Conference Proceedings (OSTI)

Research in vital fields such as micro/opto-electronics, fuel cells and tissue engineering calls for fabrication of functional structures with optimal harvesting or perfusion of matter, energy and information, via permeation and transport through random ... Keywords: Anodized aluminum oxide, Block copolymer self-assembly, Carbon nanofoams, Carbon nanotubes, Fiber electrospining, Fractals, Nanocomposite foils, Nanoheaters, Nanomanufacturing, Plasma processing, Random branching materials, Tissue scaffolds, Ultrasonic corrosion texturing, Ultrasonic powder consolidation

Charalabos C. Doumanidis

2009-04-01T23:59:59.000Z

309

The seamless computing environment  

SciTech Connect

Oak Ridge National Laboratory (ORNL), Sandia National Laboratories (SNL), and Pittsburgh Supercomputing Center (PSC) are in the midst of a project through which their supercomputers are linked via high speed networks. The goal of this project is to solve national security and scientific problems too large to run on a single machine. This project, as well as the desire to maximize the use of high performance computing systems, has provided the impetus to develop and implement software tools and infrastructure to automate the tasks associated with running codes on one or more heterogeneous machines from a geographically distributed pool. The ultimate goal of this effort is the Seamless Computing Environment (SCE). SCE is a production environment to which a user submits a job and receives results without having to worry about scheduling resources or even which resources the system uses. The compilation, data migration, scheduling, and execution will take place with minimal user intervention.

Sheehan, T.J.; Papadopoulos, P.M.; Alexander, R. [and others

1997-06-01T23:59:59.000Z

310

Apparatus for measuring surface movement of an object that is subjected to external vibrations  

DOE Patents (OSTI)

A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing interferometer is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the interferometer by only one photon multiplier. In addition the interferometer includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The interferometer also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the interferometer per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading.

Kotidis, Petros A. (Waban, MA); Woodroffe, Jaime A. (North Reading, MA); Rostler, Peter S. (Newton, MA)

1997-01-01T23:59:59.000Z

311

Apparatus for measuring surface movement of an object that is subjected to external vibrations  

DOE Patents (OSTI)

A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing interferometer is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the interferometer by only one photon multiplier. In addition the interferometer includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The interferometer also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the interferometer per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading. 38 figs.

Kotidis, P.A.; Woodroffe, J.A.; Rostler, P.S.

1997-04-22T23:59:59.000Z

312

Environment control system  

SciTech Connect

A system for controlling the environment of an enclosed area in nuclear reactor installations. The system permits the changing of the environment from nitrogen to air, or from air to nitrogen, without the release of any radioactivity or process gas to the outside atmosphere. In changing from a nitrogen to an air environment, oxygen is inserted into the enclosed area at the same rate which the nitrogen-oxygen gas mixture is removed from the enclosed area. The nitrogen-oxygen gas mixture removed from the enclosed area is mixed with hydrogen, the hydrogen recombining with the oxygen present in the gas to form water. The water is then removed from the system and, if it contains any radioactive products, can be utilized to form concrete, which can then be transferred to a licensed burial site. The process gas is purified further by stripping it of carbon dioxide and then distilling it to remove any xenon, krypton, and other fission or non-condensable gases. The pure nitrogen is stored as either a cryogenic liquid or a gas. In changing from an air to nitrogen environment, the gas is removed from the enclosed area, mixed with hydrogen to remove the oxygen present, dried, passed through adsorption beds to remove any fission gases, and reinserted into the enclosed area. Additionally, the nitrogen stored during the nitrogen to air change, is inserted into the enclosed area, the nitrogen from both sources being inserted into the enclosed area at the same rate as the removal of the gas from the containment area. As designed, the amount of nitrogen stored during the nitrogen to air change substantially equals that required to replace oxygen removed during an air to nitrogen change.

Sammarone, Dino G. (Edgewood Borough, PA)

1978-01-01T23:59:59.000Z

313

Large scale test simulations using the Virtual Environment for Test Optimization (VETO)  

SciTech Connect

The Virtual Environment for Test Optimization (VETO) is a set of simulation tools under development at Sandia to enable test engineers to do computer simulations of tests. The tool set utilizes analysis codes and test information to optimize design parameters and to provide an accurate model of the test environment which aides in the maximization of test performance, training, and safety. Previous VETO effort has included the development of two structural dynamics simulation modules that provide design and optimization tools for modal and vibration testing. These modules have allowed test engineers to model and simulate complex laboratory testing, to evaluate dynamic response behavior, and to investigate system testability. Further development of the VETO tool set will address the accurate modeling of large scale field test environments at Sandia. These field test environments provide weapon system certification capabilities and have different simulation requirements than those of laboratory testing.

Klenke, S.E.; Heffelfinger, S.R.; Bell, H.J.; Shierling, C.L.

1997-10-01T23:59:59.000Z

314

Geoscience/Environment  

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

Geoscience/Environment Print Geoscience/Environment Print From the high pressures at the Earth's core to the vacuum of outer space, the ALS has tools for investigating samples from either environmental extreme. "Geoscience" at the ALS covers a wide range of topics, from carbon sequestration and air quality to cometary composition and the formation of the solar system. To narrow the focus a bit, the ALS has an important role to play in addressing a number of environmental issues, including environmental remediation, hazardous-waste management, global climate change, agricultural sustainability, and trace-element cycling in ecosystems. These problems present major scientific challenges, in part because natural systems are extremely complex at a range of scales. Moreover, the behavior of these systems is determined by a complex interplay of chemical, physical, and biological processes in spatially heterogeneous environments. The ALS can contribute to the knowledge base needed to address a variety of environmental issues by enabling a variety of investigations, including analytical chemistry, microscopy of heterogeneous media, and reaction kinetics in natural systems.

315

Galaxy Evolution and Environment  

E-Print Network (OSTI)

The properties of galaxies are strongly correlated with their environment, with red galaxies dominating galaxy clusters and blue galaxies dominating the general field. However, not all field galaxies are young: studies of the colors, line strengths, and M/L ratios of massive early-type galaxies at 0environment. There is good evidence that the growth of these galaxies does continue longer in the field than in clusters, via (nearly) dissipationless mergers of already old galaxies. These results are consistent with predictions of recent galaxy formation models, which incorporate AGN feedback to suppress star formation in the most massive halos. Systematic studies of the relation of galaxies with their environment beyond z=1 are difficult, and still somewhat contradictory. Intriguingly both the DEEP2 and VVDS surveys find that the color-density relation disappears at z~1.3, unfortunately just at the point where both surveys become highly incomplete. On the other hand, clustering studies at z~2.5 have shown that red galaxies cluster more strongly than blue galaxies, implying that the color-density relation was already in place at that redshift.

Pieter van Dokkum; Ryan Quadri

2007-04-13T23:59:59.000Z

316

Medium-solidity Vertical Axis Wind Turbines for use in Urban Environments S. Tullis, A. Fiedler, K. McLaren, S. Ziada  

E-Print Network (OSTI)

Vertical axis wind turbines are currently experiencing a renewed interest in small- scale applications in urban environments. However, vibration is a large issue with VAWTs due to their highly variable blade. A prototype of a commercially available 2.5 kW VAWT was wind tunnel tested to investigate its power

Tullis, Stephen

317

Vibrational Stability of SRF Accelerator Test Facility at Fermilab  

Science Conference Proceedings (OSTI)

Recently developed, the Superconducting Radio Frequency (SRF) Accelerator Test Facilities at Fermilab support the International Linear Collider (ILC), High Intensity Neutrino Source (HINS), a new high intensity injector (Project X) and other future machines. These facilities; Meson Detector Building (MDB) and New Muon Lab (NML) have very different foundations, structures, relative elevations with respect to grade level and surrounding soil composition. Also, there are differences in the operating equipment and their proximity to the primary machine. All the future machines have stringent operational stability requirements. The present study examines both near-field and ambient vibration in order to develop an understanding of the potential contribution of near-field sources (e.g. compressors, ultra-high and standard vacuum equipment, klystrons, modulators, utility fans and pumps) and distant noise sources to the overall system displacements. Facility vibration measurement results and methods of possible isolation from noise sources are presented and discussed.

McGee, M.W.; Volk, J.T.; /Fermilab

2009-05-01T23:59:59.000Z

318

Energy harvesting using vortex-induced vibrations of tensioned cables  

E-Print Network (OSTI)

The development of energy harvesting systems based on fluid/structure interactions is part of the global search for innovative tools to produce renewable energy. In this paper, the possibility to harvest energy from a flow using vortex-induced vibrations (VIV) of a tensioned flexible cable is analyzed. The fluid loading on the vibrating solid and resulting dynamics are computed using an appropriate wake-oscillator model, allowing one to perform a systematic parametric study of the efficiency. The generic case of an elastically-mounted rigid cylinder is first investigated, before considering an infinite cable with two different types of energy harvesting : a uniformly spanwise distributed harvesting and then a periodic distribution of discrete harvesting devices. The maximum harvesting efficiency is of the same order for each configuration and is always reached when the solid body and its wake are in a frequency lock-in state.

Grouthier, Clement; de Langre, Emmanuel

2012-01-01T23:59:59.000Z

319

Status of vibrational structure in {sup 62}Ni  

Science Conference Proceedings (OSTI)

Measurements consisting of {gamma}-ray excitation functions and angular distributions were performed using the (n,n{sup '{gamma}}) reaction on {sup 62}Ni. The excitation function data allowed us to check the consistency of the placement of transitions in the level scheme. From {gamma}-ray angular distributions, the lifetimes of levels up to {approx}3.8 MeV in excitation energy were extracted with the Doppler-shift attenuation method. The experimentally deduced values of reduced transition probabilities were compared with the predictions of the quadrupole vibrator model and with large-scale shell model calculations in the fp shell configuration space. Two-phonon states were found to exist with some notable deviation from the predictions of the quadrupole vibrator model, but no evidence for the existence of three-phonon states could be established. Z=28 proton core excitations played a major role in understanding the observed structure.

Chakraborty, A.; Orce, J. N.; Ashley, S. F.; Crider, B. P.; Elhami, E.; McEllistrem, M. T.; Mukhopadhyay, S. [Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States); Brown, B. A. [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States); Peters, E. E. [Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055 (United States); Singh, B. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada); Yates, S. W. [Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States); Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

2011-03-15T23:59:59.000Z

320

Vibration Fatigue of Small Bore Socket-Welded Pipe Joints  

Science Conference Proceedings (OSTI)

In the course of developing the screening process for the EPRI Fatigue Management Handbook, TR-104534, several areas were identified in which the industry's understanding of socket welds was somewhat lacking and current ASME Code procedures were inadequate to accurately characterize their high-cycle fatigue resistance. The research described in this report is directed at improving the understanding of socket welds and the factors and parameters that affect a socket weld's ability to resist vibration-indu...

1997-06-27T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Emergence of Molecular Chirality by Vibrational Raman Scattering  

E-Print Network (OSTI)

In this study, we apply the monitoring master equation describing decoherence of internal states to an optically active molecule prepared in a coherent superposition of nondegenerate internal states interacting with thermal photons at low temperatures. We use vibrational Raman scattering theory up to the first chiral-sensitive contribution, i.e., the mixed electric-magnetic interaction, to obtain scattering amplitudes in terms of molecular polarizability tensors. The resulting density matrix is used to obtain elastic decoherence rates.

Farhad Taher Ghahramani; Afshin Shafiee

2013-11-15T23:59:59.000Z

322

Spectroscopic probes of vibrationally excited molecules at chemically significant energies  

SciTech Connect

Infrared-optical double resonance is being used to study the unimolecular dissociation dynamics of hydrazoic acid (HN[sub 3]). 6[nu][sub NH] vibrational overtone excitation spectra are given for HN[sub 3]. Work was begun to determine the feasibility of extending the infrared-optical double resonance photofragment spectroscopy to small free radicals, and to be able to monitor atomic dissociation fragments via laser induced fluorescence in the VUV spectrum. 1 fig.

Rizzo, T.R.

1993-04-01T23:59:59.000Z

323

An Automated Home Made Low Cost Vibrating Sample Magnetometer  

E-Print Network (OSTI)

The design and operation of a homemade low cost vibrating sample magnetometer is described here. The sensitivity of this instrument is better than 10-2 emu and found to be very efficient for the measurement of magnetization of most of the ferromagnetic and other magnetic materials as a function of temperature down to 77 K and magnetic field upto 800 Oe. Both M(H) and M(T) data acquisition are fully automated employing computer and Labview software

Kundu, S

2011-01-01T23:59:59.000Z

324

Identification of dynamic properties from ambient vibration measurements  

SciTech Connect

To better understand the dynamic behavior of structures under normal dynamic loads as well as extreme loads such as those caused by seismic events or high winds, it is desirable to measure the dynamic properties (resonant frequencies, mode shapes and modal damping) of these structures. The cross-correlation function between two response measurements made on an ambiently excited structure is shown to have the same form as the system`s impulse response function. Therefore, standard time-domain curve-fitting procedures such as the complex exponential method, which are typically applied to impulse response functions, can now be applied to the cross-correlation functions to estimate the resonant frequencies and modal damping of the structure. A direct comparison of resonant frequencies identified by curve-fitting the cross-correlation functions, using traffic excitation as the ambient vibration source, and modal properties identified by standard forced vibration testing of a highway bridge, after traffic was removed, showed a maximum discrepancy of 3.63%. Similar comparisons for the average modal damping values identified by the two methods showed a 9.82% difference. This experimental verification implies that the proposed method of analyzing ambient vibration data has the potential to accurately assess the dynamic properties of large structures subjected to seismic excitations and small structures that are tested on a shake table.

Farrar, C.R. [Los Alamos National Lab., NM (United States); James, G.H. III [Sandia National Labs., Albuquerque, NM (United States)

1995-09-01T23:59:59.000Z

325

Environment Induced Time Arrow  

E-Print Network (OSTI)

The spread of the time arrows from the environment to an observed subsystem is followed within a harmonic model. A similarity is pointed out between irreversibility and a phase with spontaneously broken symmetry. The causal structure of interaction might be lost in the irreversible case, as well. The Closed Time Path formalism is developed for classical systems and shown to handle the time arrow problem in a clear and flexible manner. The quantum case is considered, as well, and the common origin of irreversibility and decoherence is pointed out.

Janos Polonyi

2012-06-25T23:59:59.000Z

326

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

327

Nanotech/Environment, Health & Safety Portal  

Science Conference Proceedings (OSTI)

NIST Home > Nanotech/Environment, Health & Safety Portal. Nanotech/Environment, Health & Safety Portal. Programs and ...

2013-05-16T23:59:59.000Z

328

Guest Editors' Introduction: Hostile Environments  

E-Print Network (OSTI)

Pervasive computing technology can save lives by both eliminating the need for humans to work in hostile environments and supporting them when they do. In general, environments that are hazardous to humans are hard on ...

Lukowicz, Paul

329

ENVIRONMENT AL REVI  

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

ENVIRONMENT ENVIRONMENT AL REVI EW for CATEG ORI CAL EXCLUS ION DETE RMINATION Rocky Mo unta in Region, Weste rn A rea Power Administra tion Stru cture Replace ment Fla min g Go rge-Vern a l No.3 138-kV tra nsmiss ion lin e (Struct ure No. 25/6) Spr ing 201 2 A. Ilricf J)cscription of Proposal: Western Area Power Adm inistration (Western) proposes to replace Structure No. 25/6 on the Flaming Gorge-Vernal No.3 138-kV transmission line. The structure is located on Bureau of Land Management lands in Uintah County. Utah (Township 3S, Range 22E, Section 7; Donkey Flat 7.5' USGS quadrangle). Work consists of removal and in-kind replacement of the wood H-frame structure and anchors utilizing rubber tired vehicles. crane, bucket truck, pole trucks/trailers, auger rig. and pick-up trucks. All work will be conducted on Western's existing

330

Communication in hazardous environments  

SciTech Connect

Radios were investigated for use in hazardous environments where protective breathing equipment such as plastic suits and respirators interfere with communication. A radio system, manufactured by Communications-Applied technology (C-AT), was identified that was designed specifically for hazardous environment communications. This equipment had been used successfully by the US Army and NASA for several years. C-AT equipment was evaluated in plantwide applications at the Savannah River Plant (SRP) using temporary frequencies obtained by the Department of Energy-Savannah River (DOE-SR). Radios performed well in all applications, which included a tritium facility, high-level caves, a nuclear reactor building, tank farm, and a canyon building interior. Permanent frequencies were obtained by DOE-SR for two complete six-man C-AT systems at SRP. Because of the relatively short range of these systems, replicates will cover all applications of this type of equipment plantwide. Twelve radio systems are currently being used successfully in plantwide applications.

Rankin, W N; Herold, T R

1986-01-01T23:59:59.000Z

331

Building Environment Division Staff Directory  

Science Conference Proceedings (OSTI)

... Energy and Environment Division. Fire Research Division. Systems Integration Division. Intelligent Systems Division. Smart Grid Program Office. ...

2013-04-03T23:59:59.000Z

332

SPRNG Parallel Random Number Generators at NERSC  

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

SPRNG SPRNG SPRNG Description The SPRNG libraries of generators produce good quality random numbers, and are also fast. They have been subjected to some of the largest random number tests, with around 10^13 RNs per test. SPRNG provides both FORTRAN and C (also C++) interfaces for the use of the parallel random number generators. Access SPRNG v2.0 is available on Carver (gcc, intel and pgi) and Cray systems (pgi and cce). Use the module utility to load the software. module load sprng Using SPRNG On Cray systems: ftn sprng_test.F $SPRNG -lsprng On Carver: mpif90 sprng_test.F $SPRNG -lsprng Documentation On Carver there are various documents in $SPRNG/DOCS and various examples in $SPRNG/EXAMPLES. See the SPRNG web site at Florida State University for complete details. For help using SPRNG at NERSC contact the

333

Regularity of nuclear structure under random interactions  

SciTech Connect

In this contribution I present a brief introduction to simplicity out of complexity in nuclear structure, specifically, the regularity of nuclear structure under random interactions. I exemplify such simplicity by two examples: spin-zero ground state dominance and positive parity ground state dominance in even-even nuclei. Then I discuss two recent results of nuclear structure in the presence of random interactions, in collaboration with Prof. Arima. Firstly I discuss sd bosons under random interactions, with the focus on excited states in the yrast band. We find a few regular patterns in these excited levels. Secondly I discuss our recent efforts towards obtaining eigenvalues without diagonalizing the full matrices of the nuclear shell model Hamiltonian.

Zhao, Y. M. [Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China)

2011-05-06T23:59:59.000Z

334

Efficient broadcast on random geometric graphs  

Science Conference Proceedings (OSTI)

A Randon Geometric Graph (RGG) is constructed by distributing n nodes uniformly at random in the unit square and connecting two nodes if their Euclidean distance is at most r, for some prescribed r. They analyze the following randomized broadcast algorithm on RGGs. At the beginning, there is only one informed node. Then in each round, each informed node chooses a neighbor uniformly at random and informs it. They prove that this algorithm informs every node in the largest component of a RGG in {Omicron}({radical}n/r) rounds with high probability. This holds for any value of r larger than the critical value for the emergence of a giant component. In particular, the result implies that the diameter of the giant component is {Theta}({radical}n/r).

Bradonjic, Milan [Los Alamos National Laboratory; Elsasser, Robert [UNIV OF PADERBORN; Friedrich, Tobias [INTERNATIONAL COMPUTER SCI.; Sauerwald, Thomas [INTERNATIONAL COMPUTER SCI.

2009-01-01T23:59:59.000Z

335

Random matrix theory for underwater sound propagation  

E-Print Network (OSTI)

Ocean acoustic propagation can be formulated as a wave guide with a weakly random medium generating multiple scattering. Twenty years ago, this was recognized as a quantum chaos problem, and yet random matrix theory, one pillar of quantum or wave chaos studies, has never been introduced into the subject. The modes of the wave guide provide a representation for the propagation, which in the parabolic approximation is unitary. Scattering induced by the ocean's internal waves leads to a power-law random banded unitary matrix ensemble for long-range deep ocean acoustic propagation. The ensemble has similarities, but differs, from those introduced for studying the Anderson metal-insulator transition. The resulting long-range propagation ensemble statistics agree well with those of full wave propagation using the parabolic equation.

Katherine C. Hegewisch; Steven Tomsovic

2011-04-20T23:59:59.000Z

336

Statistics of Extreme Waves in Random Media  

E-Print Network (OSTI)

Waves traveling through random media exhibit random focusing that leads to extremely high wave intensities even in the absence of nonlinearities. Although such extreme events are present in a wide variety of physical systems and the statistics of the highest waves is important for their analysis and forecast, it remains poorly understood in particular in the regime where the waves are highest. We suggest a new approach that greatly simplifies the mathematical analysis and calculate the scaling and the distribution of the highest waves valid for a wide range of parameters.

Jakob J. Metzger; Ragnar Fleischmann; Theo Geisel

2013-11-18T23:59:59.000Z

337

SC e-journals, Environment  

Office of Scientific and Technical Information (OSTI)

Environment Environment Acta hydrochimica et hydrobiologica Agricultural & Forest Meteorology Air, Soil and Water Research - OAJ American Journal of Environmental Sciences - OAJ Annual Review of Ecology, Evolution, and Systematics Annual Review of Environment and Resources Annual Review of Plant Biology Applied and Environmental Microbiology Applied and Environmental Soil Science - OAJ Applied Microbiology and Biotechnology Aquatic Ecology Archives of Environmental Contamination and Toxicology Atmospheric Chemistry and Physics - OAJ Atmospheric Environment BioControl Biogeochemistry Biogeosciences - OAJ Biomass & Bioenergy Bioprocess and Biosystems Engineering Bioresource Technology Biotechnology Advances BMC Ecology - OAJ Bulletin of Engineering Geology and the Environment

338

Environment, Safety & Health  

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

Links Links ESSH Policy Site Environmental Reports Environmental Regulators Upton Ecological and Research Reserve Pollution Prevention Organizations ES&H Directorate Environmental Protection Division Environmental Restoration Division Safety & Health Services Other BNL Site Index Can't View PDFs? Environment, Safety & Health Brookhaven National Lab is committed to continual improvement in environmental, safety, security, and health (ESSH) performance. Full policy description. Restoration Projects Brookhaven Graphite Research Reactor decommissioning, High Flux Beam Reactor decommissioning Groundwater Projects Peconic River Cleanup Peconic River Working Group Environmental Restoration Projects green tech ISB-inspired Greening Strategies for Your Home or Office Being green isn't rocket science. Several strategies that earned the ISB its LEED Gold certification can help reduce energy usage and make any building more environmentally friendly.

339

Virtual Environment and  

E-Print Network (OSTI)

The levels of immersion and presence felt by users in a Virtual Environment (VE) are very important factors that dictate the quality of the Virtual Reality (VR) experience. Sensori-motor systems, both hardware and software, are the components of a VR system that contribute to generate the VEs and to create the feeling of being there. This paper reviews the different visualization hardware/software components that are at the heart of a VR system and provides means for assessing their performance in the context of various applications. Because of its historical and functional importance in the field of VR, visualization hardware is reviewed first (HMDs, VRDs, stereo glasses, CRT, LCD monitors and Plasma displays...). Then, a list of the most important insights, which should be addressed when designing and assembling a VR system, are discussed. Finally, visualization software is covered in the context of the available hardware components.

Sensori-Motor Activities Visualization; M. Mokhtari; F. Lemieux; F. Bernier; D. Ouellet; R. Drouin; D. Laurendeau; A. Branzan-albu

2004-01-01T23:59:59.000Z

340

Fitting Statistical Models of Random Search in Simulation Studies  

Science Conference Proceedings (OSTI)

We consider optimization of expected system performance by random search. There are two sources of random variation in this process: (i) a search-induced variability because the expected performance of the system will vary randomly according to the alternatives ... Keywords: Optimization by random search, bootstrapping, convolution models, embedded models

Russell C. H. Cheng

2013-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Sample Environment | ORNL Neutron Sciences  

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

Home › Instruments › SNS › Sample Environment Home › Instruments › SNS › Sample Environment Sample Environment The Sample Environment Group provides equipment and support for studying materials under controlled conditions (temperature, pressure, magnetic field, chemical environment, etc.). When you come to SNS to conduct an experiment, our front-line teams are there to support you. Although we currently offer a wide range of capabilities, we realize that these capabilities must continually grow. Therefore, we also have a busy research and development team, and we encourage you to partner with them to develop new equipment and techniques. The Sample Environment Equipment Database allows you to search for information about the sample environment equipment available for HFIR and SNS instruments. It will be available in the near future for SNS sample

342

Study on the Vibrations in the Discharge Pipe of Oil Flooded Screw Compressor.  

E-Print Network (OSTI)

??Flow induced pulsation in piping are serious concern in refrigeration installations where noise and vibrations are critical factors. This report takes an insight look into… (more)

Ravinath, Vijay

2006-01-01T23:59:59.000Z

343

Vibration effects of two-phase cross flow on heat exchangers  

SciTech Connect

Excessive flow-induced vibration in tube bundles causes costly tube failures by fatigue or fretting wear. This is a common condition in many shell-and-tube heat exchangers, such as condensers and reboilers. However, designers can't plan for phenomena that they don't understand. To avoid cross-flow vibration damage, the designer must determine flow-behavior effects on tube bundles under these conditions. And this is very true when discussing two-phase cross-flow vibration. Two-phase cross-flow vibration does cause tube/tube bundle failure. Early research used single-phase flow models, which failed to accurately predict vibration behavior in a two-phase system. Consequently, single-phase models and assumptions don't apply to two-phase systems and don't accurately describe vibration-behavior for exchanger tubes. Improved heat exchanger design requires more emphasis and development on cross-flow vibration parameters. The paper describes tube vibrations; flow conditions; void-fraction effects; vortex-induced vibration; fluid excitation forces; and tube response.

Lian, H.Y.; Kawaji, M. (Univ. of Toronto, Ontario (Canada)); Chan, A.M.C. (Ontario Hydro Research Div., Toronto (Canada))

1993-03-01T23:59:59.000Z

344

Numerical and experimental investigations on vibration of simulated CANDU fuel bundles subjected to turbulent fluid flow.  

E-Print Network (OSTI)

??Vibration of simulated CANDU fuel bundles induced by coolant flow is investigated in this thesis through experiments and numerical simulations. Two simulated bundles and a… (more)

Zhang, Xuan

2011-01-01T23:59:59.000Z

345

Vibration Induced Droplet Generation from a Liquid Layer for Evaporative Cooling in a Heat Transfer Cell .  

E-Print Network (OSTI)

??During this investigation, vibration induced droplet generation from a liquid layer was examined as a means for achieving high heat flux evaporative cooling. Experiments were… (more)

Pyrtle, Frank, III

2005-01-01T23:59:59.000Z

346

Methodology for fault detection and diagnostics in an ocean turbine using vibration analysis and modeling.  

E-Print Network (OSTI)

??This thesis describes a methodology for mechanical fault detection and diagnostics in an ocean turbine using vibration analysis and modeling. This methodology relies on the… (more)

Mjit, Mustapha.

2009-01-01T23:59:59.000Z

347

Computable randomness and betting for computable probability spaces  

E-Print Network (OSTI)

Unlike Martin-L\\"of randomness and Schnorr randomness, computable randomness has not been defined, except for a few ad hoc cases, outside of Cantor space. This paper offers such a definition (actually, many equivalent definitions), and further, provides a general method for abstracting "bit-wise" definitions of randomness from Cantor space to arbitrary computable probability spaces. This same method is also applied to give machine characterizations of computable and Schnorr randomness for computable probability spaces, extending the previous known results. This paper also addresses "Schnorr's Critique" that gambling characterizations of Martin-L\\"of randomness are not computable enough. The paper contains a new type of randomness---endomorphism randomness---which the author hopes will shed light on the open question of whether Kolmogorov-Loveland randomness is equivalent to Martin-L\\"of randomness. It ends with other possible applications of the methods presented, including a possible definition of computable...

Rute, Jason

2012-01-01T23:59:59.000Z

348

Generating random graphs with large girth  

Science Conference Proceedings (OSTI)

We present a simple and efficient algorithm for randomly generating simple graphs without small cycles. These graphs can be used to design high performance Low-Density Parity-Check (LDPC) codes. For any constant k, ? ? 1/2k(k ...

Mohsen Bayati; Andrea Montanari; Amin Saberi

2009-01-01T23:59:59.000Z

349

Option pricing, maturity randomization and distributed computing  

Science Conference Proceedings (OSTI)

We price discretely monitored options when the underlying evolves according to different exponential Levy processes. By geometric randomization of the option maturity, we transform the n-steps backward recursion that arises in option pricing into an ... Keywords: Discrete monitoring, Grid computing, Integral equations, Lévy processes, Option pricing

Gianluca Fusai; Daniele Marazzina; Marina Marena

2010-07-01T23:59:59.000Z

350

Fast mesh segmentation using random walks  

Science Conference Proceedings (OSTI)

3D mesh models are now widely available for use in various applications. The demand for automatic model analysis and understanding is ever increasing. Mesh segmentation is an important step towards model understanding, and acts as a useful tool for different ... Keywords: interactive, mesh segmentation, random walks

Yu-Kun Lai; Shi-Min Hu; Ralph R. Martin; Paul L. Rosin

2008-06-01T23:59:59.000Z

351

Random testing of C calling conventions  

Science Conference Proceedings (OSTI)

In a C compiler, function calls are difficult to implement correctly because they must respect a platform-specific calling convention. But they are governed by a simple invariant: parameters passed to a function must be received unaltered. A violation ... Keywords: C, calling convention, compiler, composition, consistency, random testing

Christian Lindig

2005-09-01T23:59:59.000Z

352

A RANDOMIZED CUTTING PLANE METHOD WITH ...  

E-Print Network (OSTI)

uniform generation of random points in the convex body is available. Under this ... A center of gravity version of cutting plane, for a slightly different problem ... which is updated at each step and is guaranteed to always contain the feasible set. First of ...... The method was tested over a range of problems whose data were.

353

Randomized Model Predictive Control for HVAC Systems  

Science Conference Proceedings (OSTI)

Heating, Ventilation and Air Conditioning (HVAC) systems play a fundamental role in maintaining acceptable thermal comfort and Indoor Air Quality (IAQ) levels, essentials for occupants well-being. Since performing this task implies high energy requirements, ... Keywords: Copulas, Learning, Randomized Model Predictive Control, Smart Buildings, Sustainable Control Systems

Alessandra Parisio, Damiano Varagnolo, Daniel Risberg, Giorgio Pattarello, Marco Molinari, Karl H. Johansson

2013-11-01T23:59:59.000Z

354

Speech recognition using augmented conditional random fields  

Science Conference Proceedings (OSTI)

Acoustic modeling based on hidden Markov models (HMMs) is employed by state-of-the-art stochastic speech recognition systems. Although HMMs are a natural choice to warp the time axis and model the temporal phenomena in the speech signal, their conditional ... Keywords: augmented conditional random fields (ACRFs), augmented spaces, discriminative compression, hidden Markov models (HMMs)

Yasser Hifny; Steve Renals

2009-02-01T23:59:59.000Z

355

Purity distribution for bipartite random pure states  

E-Print Network (OSTI)

Analytic expressions for the probability density distribution of the linear entropy and the purity are derived for bipartite pure random quantum states. The explicit distributions for a state belonging to a product of Hilbert spaces of dimensions p and q are given for p=3 and any q>=3, as well as for p=q=4.

O. Giraud

2007-10-10T23:59:59.000Z

356

Ultra-High Temperature Sensors Based on Optical Property Modulation and Vibration-Tolerant Interferometry  

SciTech Connect

The goals of the this part of the Continuation Phase 2 period (Oct. 1, 06 to March 31, 07) of this project were to (a) fabricate laser-doped SiC wafers and start testing the SiC chips for individual gas species sensing under high temperature and pressure conditions and (b) demonstrate the designs and workings of a temperature probe suited for industrial power generation turbine environment. A focus of the reported work done via Kar UCF LAMP lab. is to fabricate the embedded optical phase or doped microstructures based SiC chips, namely, Chromium (C), Boron (B) and Aluminum (Al) doped 4H-SiC, and to eventually deploy such laser-doped chips to enable gas species sensing under high temperature and pressure. Experimental data is provided from SiC chip optical response for various gas species such as pure N2 and mixtures of N2 and H{sub 2}, N{sub 2} and CO, N{sub 2} and CO{sub 2}, and N{sub 2} and CH{sub 4}. Another main focus of the reported work was a temperature sensor probe assembly design and initial testing. The probe transmit-receive fiber optics were designed and tested for electrically controlled alignment. This probe design was provided to overcome mechanical vibrations in typical industrial scenarios. All these goals have been achieved and are described in detail in the report.

Nabeel A. Riza

2007-03-31T23:59:59.000Z

357

Local structure and vibrational properties of alpha'-Pu martensitein Ga-stabilized delta-Pu  

Science Conference Proceedings (OSTI)

Extended x-ray absorption fine structure spectroscopy (EXAFS) is used to investigate the local atomic environment and vibrational properties of plutonium and gallium atoms in the {alpha}{prime} and {delta} phases of a mixed phase Pu-Ga alloy. EXAFS results measured at low temperature compare the structure of the mixed phase sample with a single-phase {delta}-Pu sample. EXAFS spectral components attributed to both {alpha}{prime}-Pu and {delta}-Pu were observed in the mixed phase sample. Ga K-edge EXAFS spectra indicate local atomic environments similar to the Pu LIII-edge EXAFS results, which suggests that Ga is substitutional for Pu atoms in both the monoclinic {alpha}{prime}-Pu and the fcc {delta}-Pu structures. In {delta}-Pu, we measure a Ga-Pu bond length contraction of 0.11 Angstroms with respect to the Pu-Pu bond length. The corresponding bond-length contraction around Ga in {alpha}{prime}-Pu is only 0.03 Angstroms. Results from temperature-dependent Pu LIII-edge EXAFS measurements are fit to a correlated Debye model, and a large difference in the Pu-Pu bond Debye temperature is observed for the {alpha}{prime} and {delta} phases: {theta}{sub cD}({alpha}{prime})=159{+-}13 K versus {theta}{sub cD}({delta})=120{+-}3 K. The corresponding analysis for the Ga K EXAFS determines a Ga-Pu bond Debye temperature of {theta}{sub cD}({delta})=188{+-}12 K in the {delta}-Pu phase. These results are related to the observed solubility of Ga in {delta}-Pu, the ''stabilization'' of {delta}-Pu by Ga at room temperature, and the insolubility of Ga in {alpha}{prime}-Pu.

Nelson, E.J.; Blobaum, K.J.M.; Wall, M.A.; Allen, P.G.; Schwartz,A.J.; Booth, C.H.

2003-02-26T23:59:59.000Z

358

Direct Measurements of Pore Fluid Density by Vibrating Tube Densimetry  

Science Conference Proceedings (OSTI)

The densities of pore-confined fluids were measured for the first time by means of a vibrating tube method. Isotherms of total adsorption capacity were measured directly making the method complementary to the conventional gravimetric or volumetric/piezometric adsorption techniques, which yield the excess adsorption (the Gibbsian surface excess). A custom-made high-pressure, high-temperature vibrating tube densimeter (VTD) was used to measure the densities of subcritical and supercritical propane (between 35 C and 97 C) and supercritical carbon dioxide (between 32 C and 50 C) saturating hydrophobic silica aerogel (0.2 g/cm3, 90% porosity) synthesized inside Hastelloy U-tubes. Additionally, excess adsorption isotherms for supercritical CO2 and the same porous solid were measured gravimetrically using a precise magnetically-coupled microbalance. Pore fluid densities and total adsorption isotherms increased monotonically with increasing density of the bulk fluid, in contrast to excess adsorption isotherms, which reached a maximum at a subcritical density of the bulk fluid, and then decreased towards zero or negative values at supercritical densities. Compression of the confined fluid significantly beyond the density of the bulk liquid at the same temperature was observed at subcritical temperatures. The features of the isotherms of confined fluid density are interpreted to elucidate the observed behavior of excess adsorption. The maxima of excess adsorption were found to occur below the critical density of the bulk fluid at the conditions corresponding to the beginning of the plateau of total adsorption, marking the end of the transition of pore fluid to a denser, liquid-like pore phase. The results for propane and carbon dioxide showed similarity in the sense of the principle of corresponding states. No measurable effect of pore confinement on the liquid-vapor critical point was found. Quantitative agreement was obtained between excess adsorption isotherms determined from VTD total adsorption results and those measured gravimetrically at the same temperature, confirming the validity of the vibrating tube measurements. Vibrating tube densimetry was demonstrated as a novel experimental approach capable of providing the average density of pore-confined fluids.

Gruszkiewicz, Miroslaw {Mirek} S [ORNL; Rother, Gernot [ORNL; Wesolowski, David J [ORNL; Cole, David R [ORNL; Wallacher, Dirk [Helmholtz-Zentrum Berlin

2012-01-01T23:59:59.000Z

359

X-ray and vibrational spectroscopy of manganese complexes relevant to the oxygen-evolving complex of photosynthesis  

SciTech Connect

Manganese model complexes, relevant to the oxygen-evolving complex (OEC) in photosynthesis, were studied with Mn K-edge X-ray absorption near-edge spectroscopy (XANES), Mn Kb X-ray emission spectroscopy (XES), and vibrational spectroscopy. A more detailed understanding was obtained of the influence of nuclearity, overall structure, oxidation state, and ligand environment of the Mn atoms on the spectra from these methods. This refined understanding is necessary for improving the interpretation of spectra of the OEC. Mn XANES and Kb XES were used to study a di-(mu)-oxo and a mono-(mu)-oxo di-nuclear Mn compound in the (III,III), (III,IV), and (IV,IV) oxidation states. XANES spectra show energy shifts of 0.8 - 2.2 eV for 1-electron oxidation-state changes and 0.4 - 1.8 eV for ligand-environment changes. The shifts observed for Mn XES spectra were approximately 0.21 eV for oxidation state-changes and only approximately 0.04 eV for ligand-environment changes. This indicates that Mn Kb XES i s more sensitive to the oxidation state and less sensitive to the ligand environment of the Mn atoms than XANES. These complimentary methods provide information about the oxidation state and the ligand environment of Mn atoms in model compounds and biological systems. A versatile spectroelectrochemical apparatus was designed to aid the interpretation of IR spectra of Mn compounds in different oxidation states. The design, based on an attenuated total reflection device, permits the study of a wide spectral range: 16,700 (600 nm) - 225

Visser, Hendrik

2001-05-16T23:59:59.000Z

360

Characterization of the molecular structure and mechanical properties of polymer surfaces and protein/polymer interfaces by sum frequency generation vibrational spectroscopy and atomic force microscopy  

SciTech Connect

Sum frequency generation (SFG) vibrational spectroscopy, atomic force microscopy (AFM), and other complementary surface-sensitive techniques have been used to study the surface molecular structure and surface mechanical behavior of biologically-relevant polymer systems. SFG and AFM have emerged as powerful analytical tools to deduce structure/property relationships, in situ, for polymers at air, liquid and solid interfaces. The experiments described in this dissertation have been performed to understand how polymer surface properties are linked to polymer bulk composition, substrate hydrophobicity, changes in the ambient environment (e.g., humidity and temperature), or the adsorption of macromolecules. The correlation of spectroscopic and mechanical data by SFG and AFM can become a powerful methodology to study and engineer materials with tailored surface properties. The overarching theme of this research is the interrogation of systems of increasing structural complexity, which allows us to extend conclusions made on simpler model systems. We begin by systematically describing the surface molecular composition and mechanical properties of polymers, copolymers, and blends having simple linear architectures. Subsequent chapters focus on networked hydrogel materials used as soft contact lenses and the adsorption of protein and surfactant at the polymer/liquid interface. The power of SFG is immediately demonstrated in experiments which identify the chemical parameters that influence the molecular composition and ordering of a polymer chain's side groups at the polymer/air and polymer/liquid interfaces. In general, side groups with increasingly greater hydrophobic character will be more surface active in air. Larger side groups impose steric restrictions, thus they will tend to be more randomly ordered than smaller hydrophobic groups. If exposed to a hydrophilic environment, such as water, the polymer chain will attempt to orient more of its hydrophilic groups to the surface in order to minimize the total surface energy. With an understanding of the structural and environmental parameters which govern polymer surface structure, SFG is then used to explore the effects of surface hydrophobicity and solvent polarity on the orientation and ordering of amphiphilic neutral polymers adsorbed at the solid/liquid interface. SFG spectra show that poly(propylene glycol) (PPG) and poly(ethylene glycol) (PEG) adsorb with their hydrophobic moieties preferentially oriented toward hydrophobic polystyrene surfaces. These same moieties, however, disorder when adsorbed onto a hydrophilic silica/water interface. Water is identified as a critical factor for mediating the orientation and ordering of hydrophobic moieties in polymers adsorbed at hydrophobic interfaces. The role of bulk water content and water vapor, as they influence hydrogel surface structure and mechanics, continues to be explored in the next series of experiments. A method was developed to probe the surface viscoelastic properties of hydroxylethyl methacrylate (HEMA) based contact lens materials by analyzing AFM force-distance curves. AFM analysis indicates that the interfacial region is dehydrated, relative to the bulk. Experiments performed on poly(HEMA+MA) (MA = methacrylic acid), a more hydrophilic copolymer with greater bulk water content, show even greater water depletion at the surface. SFG spectra, as well as surface energy arguments, suggest that the more hydrophilic polymer component (such as MA) is not favored at the air interface; this may explain anomalies in water retention at the hydrogel surface. Adsorption of lysozyme onto poly(HEMA+MA) was found to further reduce near-surface viscous behavior, suggesting lower surface water content. Lastly, protein adsorption is studied using a model polymer system of polystyrene covalently bound with a monolayer of bovine serum albumin. SFG results indicate that some amino acid residues in proteins adopt preferred orientations. SFG spectra also show that the phenyl rings of the bare polystyrene substrate in contact with air or

Koffas, Telly Stelianos

2004-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

ENERGY & ENVIRONMENT DIVISION. ANNUAL REPORT FY 1980  

E-Print Network (OSTI)

OF CALIFORNIA ENERGY & ENVIRONMENT DIVISION DIVISION HEAD E.Pollutants in Combustion Environments D. Lucas, N. Brown,Inc. , Energy/Environment Data Study, Cambridge, Mass. , May

Authors, Various

2010-01-01T23:59:59.000Z

362

Constructing Commons in the Cultural Environment  

E-Print Network (OSTI)

Commons in the Cultural Environment Michael J. MadisonCOMMONS IN THE CULTURAL ENVIRONMENT Draft of August 27, 2008Commons in the Cultural Environment ? Michael J. Madison, 1

Madison, Michael J.; Frischmann, Brett M.; Strandburg, Katherine J.

2008-01-01T23:59:59.000Z

363

Stockholm Environment Institute (SEI) | Open Energy Information  

Open Energy Info (EERE)

Stockholm Environment Institute (SEI) Jump to: navigation, search Logo: Stockholm Environment Institute Name Stockholm Environment Institute Address Kraftriket 2B, SE-106 91 Place...

364

Healing effects of the built environment  

E-Print Network (OSTI)

s Hospital garden environment: Utilization and consumerand testing of models. Environment and Behavior, 36, Bond,of language acquisition. Environment and Behavior, 29, 638-

Sherman, Sandra Anne

2008-01-01T23:59:59.000Z

365

Playing the Environment: Games as Virtual Ecologies  

E-Print Network (OSTI)

Playing the Environment: Games as Virtual Ecologies Alendasocial realism, games, environment, ecology 1. INTRODUCTIONversions of the environment? The answer is multifaceted.

Chang, Alenda Y.

2009-01-01T23:59:59.000Z

366

Market Design Test Environments  

SciTech Connect

Power industry restructuring continues to evolve at multiple levels of system operations. At the bulk electricity level, several organizations charged with regional system operation are implementing versions of a Wholesale Power Market Platform (WPMP) in response to U.S. Federal Energy Regulatory Commission initiatives. Recently the Energy Policy Act of 2005 and several regional initiatives have been pressing the integration of demand response as a resource for system operations. These policy and regulatory pressures are driving the exploration of new market designs at the wholesale and retail levels. The complex interplay among structural conditions, market protocols, and learning behaviors in relation to short-term and longer-term market performance demand a flexible computational environment where designs can be tested and sensitivities to power system and market rule changes can be explored. This paper presents the use of agent-based computational methods in the study of electricity markets at the wholesale and retail levels, and distinctions in problem formulation between these levels.

Widergren, Steven E.; Sun, Junjie; Tesfatsion, Leigh

2006-06-18T23:59:59.000Z

367

Fast neutron environments.  

SciTech Connect

The goal of this LDRD project is to develop a rapid first-order experimental procedure for the testing of advanced cladding materials that may be considered for generation IV nuclear reactors. In order to investigate this, a technique was developed to expose the coupons of potential materials to high displacement damage at elevated temperatures to simulate the neutron environment expected in Generation IV reactors. This was completed through a high temperature high-energy heavy-ion implantation. The mechanical properties of the ion irradiated region were tested by either micropillar compression or nanoindentation to determine the local properties, as a function of the implantation dose and exposure temperature. In order to directly compare the microstructural evolution and property degradation from the accelerated testing and classical neutron testing, 316L, 409, and 420 stainless steels were tested. In addition, two sets of diffusion couples from 316L and HT9 stainless steels with various refractory metals. This study has shown that if the ion irradiation size scale is taken into consideration when developing and analyzing the mechanical property data, significant insight into the structural properties of the potential cladding materials can be gained in about a week.

Buchheit, Thomas Edward; Kotula, Paul Gabriel; Lu, Ping; Brewer, Luke N. (Naval Postgraduate School, Monterey, CA); Goods, Steven Howard (Sandia National Laboratories, Livermore, CA); Foiles, Stephen Martin; Puskar, Joseph David; Hattar, Khalid Mikhiel; Doyle, Barney Lee; Boyce, Brad Lee; Clark, Blythe G.

2011-10-01T23:59:59.000Z

368

Environment/Health/Safety (EHS)  

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

to assist Berkeley Lab supervisors and managers in conducting discussions on environment, safety and health topics with their staff. Each slide delivers focused talking...

369

ORISE: Contact Environment, Safety & Health  

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

Safety Integrated Safety Management Voluntary Protection Program VPP Star Status Environment Work Smart Standards Oak Ridge Institute for Science Education Contact Us Use the form...

370

Environment/Health/Safety (EHS)  

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

recommendations to the Laboratory Director on the development and implementation of Environment, Safety & Health (ES&H) policy, guidelines, codes and regulatory interpretation. It...

371

Environment/Health/Safety (EHS)  

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

Concerns Training SubcontractorsVendors (SJHA) Waste Management What We Do The EnvironmentHealthSafety division helps Berkeley Lab staff perform their work safely and in an...

372

The Parallel Applications Development Environment  

Science Conference Proceedings (OSTI)

... configured his or her environment as described in Chapter 2 of this manual. ... output of these commands, scripts, or programs can be piped back to ...

373

OpenEI Community - Environment  

Open Energy Info (EERE)

s-partner-expand-natural-gas-highwaycomments clean energy Clean Energy Fuels energy Environment Fuel GE Innovation Partnerships Technology Innovation & Solutions Transportation...

374

Recirculation of Materials and Environments  

Science Conference Proceedings (OSTI)

Mar 6, 2013... Chemical Manufacturing and Its Impact on Environment – A Review: Sergio Sanchez-Segado1; Animesh Jha1; 1University of Leeds

375

A compensated vibrating optical fiber pressure measuring device  

DOE Patents (OSTI)

A microbending optical fiber is attached under tension to a diaphragm to sense a differential pressure applied across the diaphragm which causes it to deflect. The fiber is attached to the diaphragm so that one portion of the fiber, attached to a central portion of the diaphragm, undergoes a change in tension; proportional to the differential pressure applied to the diaphragm while a second portion attached at the periphery of the diaphragm remains at a reference tension. Both portions of the fiber are caused to vibrate at their natural frequencies. Light transmitted through the fiber is attenuated by both portions of the tensioned sections of the fiber by an amount which increases with the curvature of fiber bending so that the light signal is modulated by both portions of the fiber at separate frequencies. The modulated light signal is transduced into an electrical signal. The separate modulation signals are detected to generate separate signals having frequencies corresponding to the reference and measuring vibrating sections of the continuous fiber, respectively. A signal proportional to the difference between these signals is generated which is indicative of the measured pressure differential across the diaphragm. The reference portion of the fiber is used to compensate the pressure signal for zero and span changes resulting from ambient temperature and humidity effects upon the fiber and the transducer fixture.

Fasching, G.E.; Goff, D.R.

1985-12-30T23:59:59.000Z

376

Vibration Testing - Reviewing the State of the Art  

Science Conference Proceedings (OSTI)

Vibration testing has advanced significantly over the past several decades. Comparatively speaking, enormous volumes of acceleration data are now available for virtually every vibration test. This data is readily compressed into frequency response functions and modal models. The modal models are compared with corresponding analytical models. Model updating techniques are used to adjust analytical model parameters to minimize the differences between model and test frequencies and mode shapes. These are very positive developments. Model and testing limitations lie in areas other than the direct recording and translation of acceleration data to modal models. Two major limitations of models are the inability to model damping and the limited degree to which nonlinear behavior is incorporated into model construction and model validation. Much more thorough understanding of damping mechanisms in real structures is required. Currently we know enough to bound the range of damping values for some typical structures. A much more thorough understanding of mechanical joints is required to accurately model structural joints. Some studies now underway offer a beginning to such understanding.

Hunter, N.F.

1999-06-23T23:59:59.000Z

377

Combined passive magnetic bearing element and vibration damper  

DOE Patents (OSTI)

A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium and dampen transversely directed vibrations. Mechanical stabilizers are provided to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. In a improvement over U.S. Pat. No. 5,495,221, a magnetic bearing element is combined with a vibration damping element to provide a single upper stationary dual-function element. The magnetic forces exerted by such an element, enhances levitation of the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations, and suppresses the effects of unbalance or inhibits the onset of whirl-type rotor-dynamic instabilities. Concurrently, this equilibrium is made stable against displacement-dependent drag forces of the rotating object from its equilibrium position.

Post, Richard F. (Walnut Creek, CA)

2001-01-01T23:59:59.000Z

378

Wind Turbine Gearbox Condition Monitoring Round Robin Study - Vibration Analysis  

DOE Green Energy (OSTI)

The Gearbox Reliability Collaborative (GRC) at the National Wind Technology Center (NWTC) tested two identical gearboxes. One was tested on the NWTCs 2.5 MW dynamometer and the other was field tested in a turbine in a nearby wind plant. In the field, the test gearbox experienced two oil loss events that resulted in damage to its internal bearings and gears. Since the damage was not severe, the test gearbox was removed from the field and retested in the NWTCs dynamometer before it was disassembled. During the dynamometer retest, some vibration data along with testing condition information were collected. These data enabled NREL to launch a Wind Turbine Gearbox Condition Monitoring Round Robin project, as described in this report. The main objective of this project was to evaluate different vibration analysis algorithms used in wind turbine condition monitoring (CM) and find out whether the typical practices are effective. With involvement of both academic researchers and industrial partners, the project sets an example on providing cutting edge research results back to industry.

Sheng, S.

2012-07-01T23:59:59.000Z

379

Comments on the Influence of Disorder for Pinning Model in Correlated Gaussian Environment  

E-Print Network (OSTI)

We study the random pinning model, in the case of a Gaussian environment presenting power-law decaying correlations, of exponent decay a>0. We comment on the annealed (i.e. averaged over disorder) model, which is far from being trivial, and we discuss the influence of disorder on the critical properties of the system. We show that the annealed critical exponent \

Quentin Berger

2013-01-22T23:59:59.000Z

380

Investigating the limits of randomized benchmarking protocols  

E-Print Network (OSTI)

In this paper, we analyze the performance of randomized benchmarking protocols on gate sets under a variety of realistic error models that include systematic rotations, amplitude damping, leakage to higher levels, and 1/f noise. We find that, in almost all cases, benchmarking provides better than a factor-of-two estimate of average error rate, suggesting that randomized benchmarking protocols are a valuable tool for verification and validation of quantum operations. In addition, we derive new models for fidelity decay curves under certain types of non-Markovian noise models such as 1/f and leakage errors. We also show that, provided the standard error of the fidelity measurements is small, only a small number of trials are required for high confidence estimation of gate errors.

Jeffrey M. Epstein; Andrew W. Cross; Easwar Magesan; Jay M. Gambetta

2013-08-13T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Estimation of binary Markov random fields  

E-Print Network (OSTI)

The theoryand practiceof estimationof binary Markov random fields on lattices is reviewedand advanced. The natural objects of inference are the local conditionaldistributions, which define an exponential family owing to the equivalence between Markov and Gibbs random fields. Maximumlikelihoodestimation generally is impracticable. Methods of asymptotic, or otherwise approximate, maximum likelihood estimation do not easily apply in all cases likely to be of practical interest. The only generallypracticableprocedures available thus far are the Coding Method and MaximumPseudo-Likelihood. A new estimation procedure is suggestedthat is strongly consistentfor processesdefined by translation-invariant families of local conditionaldistributions. The procedure is analogous to minimum logit chi-squareestimation in logistic regression, does not involve non-linearoptimization, and decisively beats Maximum Pseudo-Likelihood in mean squarederror. Subsarnpling techniques can be employed to assess precision,and to increase efficiency, in estimation.

Antonio Possolo; Anond Possolo

1986-01-01T23:59:59.000Z

382

Random walk computations of diffusive fields  

E-Print Network (OSTI)

A numerical study of three problems is carried out using the gradient random walk method. These problems include the heat equation, Fitzhugh-Nagumo equation, and Burgers' equation. Each problem illustrates various aspects of the operation of the numerical method. The heat equation with no reaction term illustrates the numerical algorithm, the Fitzhugh-Nagumo equation is a system with an explicit reaction term, Burgers' equation has an advection term. The gradient random walk numerical method is well suited for the diffusion problem due to the connection between Gaussian distributions and the kernel of the heat equation. The numerical results compare well with known analytical solutions. Burgers' equation is studied to examine any effects the advection term has on the results of the numerical method.

Lindstrom, Gregory Scot

1993-01-01T23:59:59.000Z

383

Effective resistance on random electrical networks  

E-Print Network (OSTI)

Take a big graph and make a random electrical network of it by assigning independent resistances on its edges. Now, ask for the behaviour of the effective resistance between two vertices (two ``poles'') far apart. We assume in general that resistances are bounded away from 0 and infinity. In this paper, we study three cases of effective resistance in such random electrical networks: from one side to another in a box of $Z^d$, between two points in $Z^2$, and between two points on a cylinder graph $GxZ$. For all these cases, we obtain the right order of the fluctuations when the poles move apart from each other, and give corresponding subgaussian concentration inequalities. For the cylinder graphs, we prove two additional results: a central limit theorem and a result of uniform stability with respect to noise.

Benaim, Michel; Rossignol, Raphael

2007-01-01T23:59:59.000Z

384

Ant Colony Clustering Procedure Used in Vibration Fault Diagnosis of Beam Pumping Unit  

Science Conference Proceedings (OSTI)

The study of vibration fault diagnosis of beam pumping unit is an important task to reasonable production, scientific management and improvement of the oil recovery. The vibration fault diagnosis is a good method with direct result. In view of measurement ... Keywords: ant colony algorithm, clustering procedure, beam pumping unit, fault, diagnosis

Wuguang Li; Shenglai Yang; Ranran Xu; Xiaoxu Sun; Xing Zhang

2011-10-01T23:59:59.000Z

385

Efficient buckling and free vibration analysis of cyclically repeated space truss structures  

Science Conference Proceedings (OSTI)

Eigenproblems play a key role in the stability and free vibration analysis of structures. In large structural models, the solutions of these problems need a considerable computational effort. There are special types of structures whose special properties ... Keywords: Buckling load, Cyclic symmetry, Decomposition, Eigenproblems, Free vibration, Space structures

K. Koohestani; A. Kaveh

2010-10-01T23:59:59.000Z

386

Practical dynamic analysis of structures laterally vibrating in contact with water  

Science Conference Proceedings (OSTI)

This paper proposes a practical formulation to investigate the dynamic response of structures laterally vibrating in contact with water on one or both sides. The proposed technique accounts for structure's flexibility, soil flexibility, varying water ... Keywords: Dynamic analysis, Finite elements, Fluid-structure interaction, Hydrodynamic loads, Simplified formulations, Vibration periods

Benjamin Miquel; Najib Bouaanani

2011-12-01T23:59:59.000Z

387

The Vibration Frequencies of Wind Turbine Steel Tower by Transfer Matrix Method  

Science Conference Proceedings (OSTI)

Large-scale wind turbine structure is simplified as a slender cantilever beam with variable sections subject to complex loads configuration. An analytical procedure to estimate not only natural frequencies but also vibration mode shapes of thin-walled ... Keywords: horizontal axis wind turbine tower, natural frequency, transfer matrix method, free vibration

Wang Meng; Wang Zhangqi

2011-01-01T23:59:59.000Z

388

Nonlinear vibration analysis of actively loaded sandwich piezoelectric beams with geometric imperfections  

Science Conference Proceedings (OSTI)

Modal analysis is developed for linear and nonlinear vibrations of deformed sandwich piezoelectric beams with initial imperfections. The beam is subjected to axial displacement and active voltage generated by the top and the bottom piezoelectric layers. ... Keywords: Control, Nonlinear, Piezoelectric, Sandwich, Stability, Vibration

L. Azrar; S. Belouettar; J. Wauer

2008-12-01T23:59:59.000Z

389

A digital vibrating magnetic gyrometer using a control motor DSP TMS320F243  

E-Print Network (OSTI)

A digital vibrating magnetic gyrometer using a control motor DSP TMS320F243 G. Baudoin(1) , O processing system to control a vibrating magnetic gyrometer (VMG). This low cost angular speed sensor has is implemented on a Digital Signal Processor TMS320F243 dedicated to motor control. This DSP is perfectly suited

Baudoin, Geneviève

390

Effects of Vibrator Types and Their Placement on Bone?Conduction Threshold Measurements  

Science Conference Proceedings (OSTI)

Monaural bone?conduction threshold measurements in the quiet were obtained for 10 normally hearing young adults at both forehead and mastoid positions using two hearing?aid?type vibrators of different manufacture. Physical calibration data for the vibrators were obtained by other laboratories

Peter B. Weston; Roy W. Gengel; Ira J. Hirsh

1966-01-01T23:59:59.000Z

391

Selective ensemble modeling parameters of mill load based on shell vibration signal  

Science Conference Proceedings (OSTI)

Load parameters inside the ball mill have direct relationships with the optimal operation of grinding process. This paper aims to develop a selective ensemble modeling approach to estimate these parameters. At first, the original vibration signal is ... Keywords: empirical mode decomposition, selective ensemble modeling, soft sensor, vibration frequency spectrum

Jian Tang; Li-Jie Zhao; Jia Long; Tian-you Chai; Wen Yu

2012-07-01T23:59:59.000Z

392

Time domain 3D finite element modelling of train-induced vibration at high speed  

Science Conference Proceedings (OSTI)

The purpose of this paper is to investigate a 3D finite element (FE) coupled train-track model for the numerical modelling of the ground induced vibration due to the passage of a single high speed train locomotive. The track components such as the sleepers, ... Keywords: Finite elements, Ground vibration, High-speed, Mach cone, Railways

A. El Kacimi; P. K. Woodward; O. Laghrouche; G. Medero

2013-03-01T23:59:59.000Z

393

How random is your heart beat?  

E-Print Network (OSTI)

We measure the content of random uncorrelated noise in heart rate variability using a general method of noise level estimation using a coarse grained entropy. We show that usually - except for atrial fibrillation - the level of such noise is within 5 - 15% of the variance of the data and that the variability due to the linearly correlated processes is dominant in all cases analysed but atrial fibrillation. The nonlinear deterministic content of heart rate variability remains significant and may not be ignored.

Urbanowicz, K; Holyst, J A; Zebrowski, J J

2006-01-01T23:59:59.000Z

394

Average transmission probability of a random stack  

E-Print Network (OSTI)

The transmission through a stack of identical slabs that are separated by gaps with random widths is usually treated by calculating the average of the logarithm of the transmission probability. We show how to calculate the average of the transmission probability itself with the aid of a recurrence relation and derive analytical upper and lower bounds. The upper bound, when used as an approximation for the transmission probability, is unreasonably good and we conjecture that it is asymptotically exact.

Yin Lu; Christian Miniatura; Berthold-Georg Englert

2009-07-31T23:59:59.000Z

395

Randomized control of open quantum systems  

E-Print Network (OSTI)

The problem of open-loop dynamical control of generic open quantum systems is addressed. In particular, I focus on the task of effectively switching off environmental couplings responsible for unwanted decoherence and dissipation effects. After revisiting the standard framework for dynamical decoupling via deterministic controls, I describe a different approach whereby the controller intentionally acquires a random component. An explicit error bound on worst-case performance of stochastic decoupling is presented.

Lorenza Viola

2006-01-16T23:59:59.000Z

396

Spectral measures of powers of random matrices  

E-Print Network (OSTI)

This paper considers the empirical spectral measure of a power of a random matrix drawn uniformly from one of the compact classical matrix groups. We give sharp bounds on the $L_p$-Wasserstein distances between this empirical measure and the uniform measure on the circle, which show a smooth transition in behavior when the power increases and yield rates on almost sure convergence when the dimension grows. Along the way, we prove the sharp logarithmic Sobolev inequality on the unitary group.

Elizabeth Meckes; Mark Meckes

2012-10-09T23:59:59.000Z

397

Analysis of vibration and pressure pulsation in positive displacement drilling motors  

Science Conference Proceedings (OSTI)

Three, Moineau principle, positive displacement (drilling) motors were tested on a dynamometer using water, air/mist, and foam. In conjunction with a traditional motor performance test, data were collected at 5000 samples per second using an adapted seismic data acquisition system. Shaft speed, torque, pressure, and three-axis vibration data were processed using Seismic Analysis Code (SAC) to obtain energy density spectrums (EDSs). Cascade plots were generated by plotting the EDSs against shaft speed. The cascade plots revealed that pressure pulses and motor vibrations are closely related to the eccentric rotation of the rotor in the power section. Excessive no-load vibrations were not observed in the small motors and test apparatus used; increasing torque usually decreases the amplitude of vibrations observed. Motor vibration amplitudes were as a rule not increased when compressible fluids were substituted for water.

Hamlin, D.B.; Dreesen, D.S.

1998-12-31T23:59:59.000Z

398

Absolute angle-differential vibrational excitation cross sections for electron collisions with diacetylene  

SciTech Connect

Absolute vibrational excitation cross sections were measured for diacetylene (1,3-butadiyne). The selectivity of vibrational excitation reveals detailed information about the shape resonances. Excitation of the C{identical_to}C stretch and of double quanta of the C-H bend vibrations reveals a {sup 2}{Pi}{sub u} resonance at 1 eV (autodetachment width {approx}30 meV) and a {sup 2}{Pi}{sub g} resonance at 6.2 eV (autodetachment width 1-2 eV). There is a strong preference for excitation of even quanta of the bending vibration. Excitation of the C-H stretch vibration reveals {sigma}* resonances at 4.3, 6.8, and 9.8 eV, with autodetachment widths of {approx}2 eV. Detailed information about resonances permits conclusions about the mechanism of the dissociative electron attachment.

Allan, M.; May, O.; Fedor, J.; Ibanescu, B. C.; Andric, L. [Department of Chemistry, University of Fribourg, Chemin du Musee 9, CH-1700 Fribourg (Switzerland); UPMC, Universite Paris 06, LCPMR, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France) and CNRS, LCPMR (UMR 7614), 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)

2011-05-15T23:59:59.000Z

399

Multiscale Modeling of Interfacial Environments around ...  

Science Conference Proceedings (OSTI)

Multiscale Modeling of Interfacial Environments around Carbon Nanotubes. ... can be significantly affected by the interfacial environment at the ...

2013-02-13T23:59:59.000Z

400

Comparative Study of Vibration Stability at Operating Light Source Facilities and Lessons Learned in Achieving NSLS II Stability Goals  

E-Print Network (OSTI)

Comparative Study of Vibration Stability at Operating Light Source Facilities and Lessons Learned in Achieving NSLS II Stability Goals

Simos, N; Fallier, M

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

The human agent virtual environment  

Science Conference Proceedings (OSTI)

In this paper we describe a multi-agent simulation called the Human Agent Virtual Environment (or HAVE). HAVE is a test bed to explore agent-environment interaction in multi-agent simulation for defence applications. The primary research driver in the ... Keywords: agents and cognitive models, defence, multi-agent simulation and modeling

Michael Papasimeon; Adrian R. Pearce; Simon Goss

2007-05-01T23:59:59.000Z

402

Qualitative physics in virtual environments  

Science Conference Proceedings (OSTI)

In this paper, we describe a new approach to the creation of virtual environments, which uses qualitative physics to implement object behaviour. We adopted Qualitative Process Theory as a qualitative reasoning formalism, due to its representational properties ... Keywords: intelligent virtual environments, modelling and simulation, qualitative physics

Marc Cavazza; Simon Hartley; Jean-Luc Lugrin; Mikael Le Bras

2004-01-01T23:59:59.000Z

403

Citation Environment of Angewandte Chemie  

E-Print Network (OSTI)

Recently, aggregated journal-journal citation networks were made accessible from the perspective of each journal included in the Science Citation Index see (http://www.leydesdorff.net/). The local matrices can be used to inspect the relevant citation environment of a journal using statistical analysis and visualization techniques from social network analysis. The inspection gives an answer to the question what the local impact of this and other journals in the environment is. In this study the citation environment of Angewandte Chemie was analysed. Angewandte Chemie is one of the prime chemistry journals in the world. Its environment was compared with that of the Journal of the American Chemical Society. The results of the environment analyses give a detailed insight into the field-embeddedness of Angewandte Chemie. The impacts of the German and international editions of this journal are compared.

Bornmann, Lutz; Marx, Werner

2009-01-01T23:59:59.000Z

404

On the use of financial data as a random beacon  

Science Conference Proceedings (OSTI)

In standard voting procedures, random audits are one method for increasing election integrity. In the case of cryptographic (or end-to-end) election verification, random challenges are often used to establish that the tally was computed correctly. In ...

Jeremy Clark; Urs Hengartner

2010-08-01T23:59:59.000Z

405

Random fan-out state induced by site-random interlayer couplings  

Science Conference Proceedings (OSTI)

We study the low-temperature properties of a classical Heisenberg model with site-random interlayer couplings on the cubic lattice. This model is introduced as a simplified effective model of Sr(Fe{sub 1-x}Mn{sub x})O{sub 2}, which was recently synthesized. In this material, when x=0.3, ({pi}{pi}{pi}) and ({pi}{pi}0) mixed ordering is observed by neutron diffraction measurements. Using Monte Carlo simulations, we find an exotic bulk spin structure that explains the experimentally obtained results. We name this spin structure the ''random fan-out state.'' The mean-field calculations provide an intuitive understanding of this phase being induced by the site-random interlayer couplings. Since Rietveld analysis assuming the random fan-out state agrees well with the neutron diffraction pattern of Sr(Fe{sub 0.7}Mn{sub 0.3})O{sub 2}, we conclude that the random fan-out state is reasonable for the spin-ordering pattern of Sr(Fe{sub 0.7}Mn{sub 0.3})O{sub 2} at the low-temperature phase.

Tamura, Ryo; Kawashima, Naoki; Yamamoto, Takafumi; Tassel, Cedric; Kageyama, Hiroshi [Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581 (Japan); Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyouku, Kyoto 615-8510 (Japan)

2011-12-01T23:59:59.000Z

406

Capacity dynamics of feed-forward, flow-matching networks exposed to random disruptions  

E-Print Network (OSTI)

While lean manufacturing has greatly improved the efficiency of production operations, it has left US enterprises in an increasingly risky environment. Causes of manufacturing disruptions continue to multiply, and today, seemingly minor disruptions can cause cascading sequences of capacity losses. Historically, enterprises have lacked viable tools for addressing operational volatility. As a result, each year US companies forfeit billions of dollars to unpredictable capacity disruptions and insurance premiums. In this dissertation we develop a number of stochastic models that capture the dynamics of capacity disruptions in complex multi-tier flow-matching feed-forward networks (FFN). In particular, we relax basic structural assumptions of FFN, introduce random propagation times, study the impact of inventory buffers on propagation times, and make initial efforts to model random network topology. These stochastic models are central to future methodologies supporting strategic risk management and enterprise network design.

Savachkin, Aliaksei

2005-08-01T23:59:59.000Z

407

Fundamental Vibrational Transitions of HCl Detected in CRL 2136  

E-Print Network (OSTI)

We would like to understand the chemistry of dense clouds and their hot cores more quantitatively by obtaining more complete knowledge of the chemical species present in them. We have obtained high-resolution infrared absorption spectroscopy at 3-4 um toward the bright infrared source CRL 2136. The fundamental vibration-rotation band of HCl has been detected within a dense cloud for the first time. The HCl is probably located in the warm compact circumstellar envelope or disk of CRL 2136. The fractional abundance of HCl is (4.9-8.7)e-8, indicating that approximately 20 % of the elemental chlorine is in gaseous HCl. The kinetic temperature of the absorbing gas is 250 K, half the value determined from infrared spectroscopy of 13CO and water. The percentage of chlorine in HCl is approximately that expected for gas at this temperature. The reason for the difference in temperatures between the various molecular species is unknown.

Goto, Miwa; Geballe, T R; Menten, K M; Indriolo, N; Neufeld, D A

2013-01-01T23:59:59.000Z

408

GAS-PHASE MOLECULAR DYNAMICS: VIBRATIONAL DYNAMICS OF POLYATOMIC MOLECULES  

SciTech Connect

The goal of this research is the understanding of elementary chemical and physical processes important in the combustion of fossil fuels. Interest centers on reactions and properties of short-lived chemical intermediates. High-resolution, high-sensitivity, laser absorption methods are augmented by high-temperature, flow-tube reaction kinetics studies with mass-spectrometric sampling. These experiments provide information on the energy levels, structures and reactivity of molecular free radical species and, in turn, provide new tools for the study of energy flow and chemical bond cleavage in radicals involved in chemical systems. The experimental work is supported by theoretical studies using time-dependent quantum wavepacket calculations, which provide insight into energy flow among the vibrational modes of polyatomic molecules and interference effects in multiple-surface dynamics.

MUCKERMAN,J.T.

1999-06-09T23:59:59.000Z

409

Gas-Phase Molecular Dynamics: Vibrational Dynamics of Polyatomic Molecules  

SciTech Connect

The goal of this research is the understanding of elementary chemical and physical processes important in the combustion of fossil fuels. Interest centers on reactions and properties of short-lived chemical intermediates. High-resolution, high-sensitivity, laser absorption methods are augmented by high- temperature, flow-tube reaction kinetics studies with mass-spectrometic sampling. These experiments provide information on the energy levels, structures and reactivity of molecular free radical species and in turn, provide new tools for the study of energy flow and chemical bond cleavage in the radicals involved in chemical systems. The experimental work is supported by theoretical studies using time-dependent quantum wavepacket calculations, which provide insight into energy flow among the vibrational modes of polyatomic molecules and interference effects in multiple-surface dynamics.

Muckerman, J.T.

1999-05-21T23:59:59.000Z

410

An Innovative Transponder-Based Interferometric Radar for Vibration Measurements  

SciTech Connect

Ground-based radar interferometry has recently emerged as an innovative technology of remote sensing, able to accurately measure the static or dynamic displacement of several points of a structure. This technique in the last couple of years has been applied to different types of structures, such as bridges, towers and chimneys. This paper presents a prototype system developed by IDS, originally aimed at measuring the structural vibrations of helicopter rotor blades, based on an interferometric technique and constituted by combination of a radar sensor and a series of transponders installed on the target structure. The main advantages of this solution with respect to conventional interferometric radars, are related to the increased spatial resolution of the system, provided by the possibility to discriminate different transponders installed within the same resolution cell of the radar sensor, and to the reduction of the ambient noise (e.g. multi-path) on the radar measurement. The first feature allows the use of the microwave technology even on target areas with limited dimensions, such as industrial facilities, while the second aspect may extend the use of radar interferometric systems to complex scenarios, where multi-reflections are expected due to the presence of natural targets with high reflectivity to the radar signal. In the paper, the system and its major characteristics are first described; subsequently, application to the measurement of ambient vibration response of a lab set-up is summarized. Then the data acquired on a rotating mock-up are reported and analyzed to identify natural frequencies and mode shapes of the investigated structure.

Coppi, F.; Cerutti, A.; Farina, P.; De Pasquale, G.; Novembrini, G. [IDS Ingegneria dei Sistemi S.p.A., Via Livornese 1019, Pisa (Italy)

2010-05-28T23:59:59.000Z

411

Image denoising based on hierarchical Markov random field  

Science Conference Proceedings (OSTI)

We propose a hierarchical Markov random field model-based method for image denoising in this paper. The method employs a Markov random field (MRF) model with three layers. The first layer represents the underlying texture regions. The second layer represents ... Keywords: Bayesian estimation, Image denoising, Markov random field

Yang Cao; Yupin Luo; Shiyuan Yang

2011-01-01T23:59:59.000Z

412

Mirage: Mitigating Illicit Inventorying in a RFID Enabled Retail Environment  

E-Print Network (OSTI)

Given its low dollar and maintenance cost, RFID is poised to become the enabling technology for inventory control and supply chain management. However, as an outcome of its low cost, RFID based inventory control is susceptible to pernicious security and privacy threats. A deleterious attack on such a system is corporate espionage, where attackers through illicit inventorying infer sales and restocking trends for products. In this paper, we first present plausible aftermaths of corporate espionage using real data from online sources. Second, to mitigate corporate espionage in a retail store environment, we present a simple lowcost system called Mirage. Mirage uses additional programmable low cost passive RFID tags called honeytokens to inject noise in retail store inven-torying. Using a simple history based algorithm that controls activation and de-activation of honeytokens, Mirage randomizes sales and restocking trends. We evaluate Mirage in a real warehouse environment using a commercial off-the-shelf Motoro...

White, Jonathan

2010-01-01T23:59:59.000Z

413

Robust randomized benchmarking of quantum processes  

E-Print Network (OSTI)

We describe a simple randomized benchmarking protocol for quantum information processors and obtain a sequence of models for the observable fidelity decay as a function of a perturbative expansion of the errors. We are able to prove that the protocol provides an efficient and reliable estimate of an average error-rate for a set operations (gates) under a general noise model that allows for both time and gate-dependent errors. We determine the conditions under which this estimate remains valid and illustrate the protocol through numerical examples.

Easwar Magesan; J. M. Gambetta; Joseph Emerson

2010-09-19T23:59:59.000Z

414

Rolling motion of a rigid sphere on a structured rubber substrate aided by a random noise and an external bias  

E-Print Network (OSTI)

We study the rolling motion of a small solid sphere on a surface patterned rubber substrate in an external field with and without a noise. In the absence of the noise, the ball does not move below a threshold force above which it accelerates sub-linearly with the applied field. In the presence of a random noise, the ball exhibits a stochastic rolling with a net drift, the velocity of which increases non-linearly with the strength of the noise (K). From the evolution of the displacement distribution, it is evident that the rolling is controlled by a Coulomb like friction at a very low velocity, a super-linear friction at an intermediate velocity and a linear kinematic friction at a large velocity. This transition from a non-linear to a linear friction control of motion can be discerned from another experiment in which the ball is subjected to a small amplitude periodic asymmetric vibration in conjunction with a random noise. Here, as opposed to that of a fixed external force, the rolling velocity decreases with the increase of the strength of the noise suggesting a progressive fluidization of the interface. Furthermore, the ball exhibits a flow reversal with the increase of the amplitude of the asymmetric vibration, which is indicative of a profile of friction that first descends and then ascends with velocity. An approximate non-linear friction model with the non-linearity decreasing with K is somewhat consistent with the evolution of the displacement fluctuation that also explains the sigmoidal variation of the drift velocity with the strength of the noise. This research sets the stage for studying friction in a new way, in which it is submitted to a noise and then its dynamic response is studied using the tools of statistical mechanics.

Partho S. Goohpattader; Srinivas Mettu; Manoj K. Chaudhury

2011-08-03T23:59:59.000Z

415

Single event phenomena in atmospheric neutron environments  

SciTech Connect

As integrated circuit technology achieves higher density through smaller feature sizes and as the airplane manufacturing industry integrates more sophisticated electronic components into the design of new aircraft, it has become increasingly important to evaluate the contribution of single event effects, primarily Single Event Upset (SEU), to the safety and reliability of commercial aircraft. In contrast to the effects of radiation on electronic systems in space applications for which protons and heavy ions are of major concern, in commercial aircraft applications the interactions of high energy neutrons are the dominant cause of single event effects. These high energy neutrons are produced by the interaction of solar and galactic cosmic rays, principally protons and heavy ions, in the upper atmosphere. This paper will describe direct experimental measurements of neutron-induced Single Event Effect (SEE) rates in commercial high density static random access memories in a neutron environment characteristic of that at commercial airplane altitudes. The first experimental measurements testing current models for neutron-silicon burst generation rates will be presented, as well as measurements of charge collection in silicon test structures as a function of neutron energy. These are the first laboratory SEE and charge collection measurements using a particle beam having a continuum energy spectrum and with a shape nearly identical to that observed during flight.

Gossett, C.A.; Hughlock, B.W.; Katoozi, M.; LaRue, G.S. (Boeing Defense and Space Group, Seattle, WA (United States)); Wender, S.A. (Los Alamos National Lab., NM (United States))

1993-12-01T23:59:59.000Z

416

Cyclogenesis in a Saturated Environment  

Science Conference Proceedings (OSTI)

The dynamics of baroclinic wave growth in a saturated environment is examined using linear and nonlinear models employing a parameterization of latent heat release that assumes all rising air is saturated, and saturation equivalent potential ...

Jeffrey S. Whitaker; Christopher A. Davis

1994-03-01T23:59:59.000Z

417

The Environment, Health and Safety  

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

Environment, Health and Safety Program at the MIT Plasma Science and Fusion Center Catherine Fiore PSFC Office of ES&H May 14, 2003 C Mod Alcator Design of the EHS system for...

418

Views of software development environments  

Science Conference Proceedings (OSTI)

This paper develops an abstract model of software development and then explores its implications for software development environments (SDEs). It explores the automation of engineering, i.e., what to automate, and the engineering of automation, ...

W. Stinson

1989-07-01T23:59:59.000Z

419

Environment | OpenEI Community  

Open Energy Info (EERE)

Environment Home Jessi3bl's picture Submitted by Jessi3bl(15) Member 16 December, 2012 - 19:18 GE, Clean Energy Fuels Partner to Expand Natural Gas Highway clean energy Clean...

420

Correlated disorder in random block-copolymers  

E-Print Network (OSTI)

We study the effect of a random Flory-Huggins parameter in a symmetric diblock copolymer melt which is expected to occur in a copolymer where one block is near its structural glass transition. In the clean limit the microphase segregation between the two blocks causes a weak, fluctuation induced first order transition to a lamellar state. Using a renormalization group approach combined with the replica trick to treat the quenched disorder, we show that beyond a critical disorder strength, that depends on the length of the polymer chain, the character of the transition is changed. The system becomes dominated by strong randomness and a glassy rather than an ordered lamellar state occurs. A renormalization of the effective disorder distribution leads to nonlocal disorder correlations that reflect strong compositional fluctuation on the scale of the radius of gyration of the polymer chains. The reason for this behavior is shown to be the chain length dependent role of critical fluctuations, which are less important for shorter chains and become increasingly more relevant as the polymer length increases and the clean first order transition becomes weaker.

Harry Westfahl Jr.; Joerg Schmalian

2005-01-27T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Development of Design Criteria for Fluid Induced Structural Vibrations in Steam Generators and Heat Exchangers  

SciTech Connect

Flow-induced vibration in heat exchangers has been a major cause of concern in the nuclear industry for several decades. Many incidents of failure of heat exchangers due to apparent flow-induced vibration have been reported through the USNRC incident reporting system. Almost all heat exchangers have to deal with this problem during their operation. The phenomenon has been studied since the 1970s and the database of experimental studies on flow-induced vibration is constantly updated with new findings and improved design criteria for heat exchangers.

Uvan Catton; Vijay K. Dhir; Deepanjan Mitra; Omar Alquaddoomi; Pierangelo Adinolfi

2004-04-06T23:59:59.000Z

422

The Airborne Metagenome in an Indoor Urban Environment  

SciTech Connect

The indoor atmosphere is an ecological unit that impacts on public health. To investigate the composition of organisms in this space, we applied culture-independent approaches to microbes harvested from the air of two densely populated urban buildings, from which we analyzed 80 megabases genomic DNA sequence and 6000 16S rDNA clones. The air microbiota is primarily bacteria, including potential opportunistic pathogens commonly isolated from human-inhabited environments such as hospitals, but none of the data contain matches to virulent pathogens or bioterror agents. Comparison of air samples with each other and nearby environments suggested that the indoor air microbes are not random transients from surrounding outdoor environments, but rather originate from indoor niches. Sequence annotation by gene function revealed specific adaptive capabilities enriched in the air environment, including genes potentially involved in resistance to desiccation and oxidative damage. This baseline index of air microbiota will be valuable for improving designs of surveillance for natural or man-made release of virulent pathogens.

Tringe, Susannah; Zhang, Tao; Liu, Xuguo; Yu, Yiting; Lee, Wah Heng; Yap, Jennifer; Yao, Fei; Suan, Sim Tiow; Ing, Seah Keng; Haynes, Matthew; Rohwer, Forest; Wei, Chia Lin; Tan, Patrick; Bristow, James; Rubin, Edward M.; Ruan, Yijun

2008-02-12T23:59:59.000Z

423

An implementation and analysis of a randomized distributed stack  

E-Print Network (OSTI)

This thesis presents an algorithm for a randomized distributed stack, a coded simulator for examining its behavior, and an analysis of data collected from simulations configured to investigate its performance in particular situations. This randomized distributed stack represents an experimental extension of the probabilistic quorum algorithm of Malki et al. [5,4] and the random regular register of Welch and Lee [3]. Employing the probabilistic quorum algorithm in the same manner as the random regular register, the randomized distributed stack stands to positively affect the load and availability of a system. Popping this randomized distributed stack, however, sometimes returns incorrect values. Analysis of the data assembled reveals two interesting conclusions: 1) as the number of uninterrupted pops increases, the variance of the pop success percentage increases, and 2) for a fixed quorum size percentage, a larger system of data servers yields a higher pop success percentage. Further research remains to fully characterize and generalize the behavior of the randomized distributed stack.

Kirkland, Dustin Charles

2001-01-01T23:59:59.000Z

424

Method and apparatus for measuring surface movement of a solid object that is subjected to external vibrations  

DOE Patents (OSTI)

A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing interferometer is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the interferometer by only one photon multiplier. In addition the interferometer includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The interferometer also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the interferometer per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading. 38 figs.

Schultz, T.J.; Kotidis, P.A.; Woodroffe, J.A.; Rostler, P.S.

1995-04-25T23:59:59.000Z

425

Method and apparatus for measuring surface movement of a solid object that is subjected to external vibrations  

DOE Patents (OSTI)

A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing interferometer is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the interferometer by only one photon multiplier. In addition the interferometer includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The interferometer also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the interferometer per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading.

Schultz, Thomas J. (Maumee, OH); Kotidis, Petros A. (Waban, MA); Woodroffe, Jaime A. (North Reading, MA); Rostler, Peter S. (Newton, MA)

1995-01-01T23:59:59.000Z

426

A MATLAB® function for Network Environ Analysis  

Science Conference Proceedings (OSTI)

Network Environ Analysis is a formal, quantitative methodology to describe an object's within system ''environ''ment [Patten, B.C., 1978a. Systems approach to the concept of environment. Ohio Journal of Science 78, 206-222]. It provides a perspective ... Keywords: Ecological Modelling, Ecological Network Analysis, Network Environ Analysis

Brian D. Fath; Stuart R. Borrett

2006-03-01T23:59:59.000Z

427

The rule for a subdiffusive particle in an extremely diverse environment  

E-Print Network (OSTI)

The dynamics of a subdiffusive continuous time random walker in an inhomogeneous environment is analyzed. In each microscopic jump, a random time is drawn from a waiting time probability density function (WT-PDF) that decays as a power law: phi(t;k)~k/(1+kt)^(1+beta), 0 beta;, mu=beta, but when 1-gammaenvironment made of many slow local regions. These two different mechanisms for subdiffusion are not additive, and compete each other. The reported transition is dimension independent, and disappears when the power beta is also distributed, in the range, 0

Ophir Flomenbom

2008-05-27T23:59:59.000Z

428

Characterizing Quantum Gates via Randomized Benchmarking  

E-Print Network (OSTI)

We describe and expand upon the scalable randomized benchmarking protocol proposed in Phys. Rev. Lett. 106, 180504 (2011) which provides a method for benchmarking quantum gates and estimating the gate-dependence of the noise. The protocol allows the noise to have weak time and gate-dependence, and we provide a sufficient condition for the applicability of the protocol in terms of the average variation of the noise. We discuss how state preparation and measurement errors are taken into account and provide a complete proof of the scalability of the protocol. We establish a connection in special cases between the error rate provided by this protocol and the error strength measured using the diamond norm distance.

Easwar Magesan; Jay M. Gambetta; Joseph Emerson

2011-09-30T23:59:59.000Z

429

Independence Test for High Dimensional Random Vectors  

E-Print Network (OSTI)

This paper proposes a new mutual independence test for a large number of high dimensional random vectors. The test statistic is based on the characteristic function of the empirical spectral distribution of the sample covariance matrix. The asymptotic distributions of the test statistic under the null and local alternative hypotheses are established as dimensionality and the sample size of the data are comparable. We apply this test to examine multiple MA(1) and AR(1) models, panel data models with some spatial cross-sectional structures. In addition, in a flexible applied fashion, the proposed test can capture some dependent but uncorrelated structures, for example, nonlinear MA(1) models, multiple ARCH(1) models and vandermonde matrices. Simulation results are provided for detecting these dependent structures. An empirical study of dependence between closed stock prices of several companies from New York Stock Exchange (NYSE) demonstrates that the feature of cross--sectional dependence is popular in stock m...

Pan, G M; Yang, Y; Guo, M

2012-01-01T23:59:59.000Z

430

Long wave runup on random beaches  

E-Print Network (OSTI)

The estimation of the maximum wave sunup height is a problem of practical importance. Most of the analytical and numerical studies are limited to a constant slope plain shore and to the classical Nonlinear Shallow Water (NSW) equations. However, in nature the shore is characterized by some roughness. In order to take into account the effects of the bottom rugosity various ad-hoc friction terms are usually used. In this paper we study the effect of the roughness of the bottom on the maximum runup height. A stochastic model is proposed to describe the bottom irregularity and its effect is quantified using Monte-Carlo simulations. For the discretization of the NSW equations we employ modern finite volume schemes. Moreover, the results of the random bottom model are compared with the more conventional approaches.

Dutykh, Denys; Mitsotakis, Dimitrios

2011-01-01T23:59:59.000Z

431

Subgraphs of quasi-random oriented graphs  

E-Print Network (OSTI)

One cannot guarantee the presence of an oriented four-cycle in an oriented graph $D$ simply by demanding it has many edges, as an acyclic orientation of the complete graph on $n$ vertices has $\\binom{n}{2}$ edges -- the most possible -- but contains no oriented cycle. We show that a simple quasi-randomness condition on the orientation of $D$ does allow one to guarantee the presence of an oriented four-cycle. Significantly our results work even for sparse oriented graphs. Furthermore, we give examples which show that, in a sense, our result is best possible. We also prove a result concerning oriented six-cycles and a more general result in the case $D$ is dense. Finally, we raise a number of questions and conjectures related to these results.

Amini, Omid; Huc, Florian

2009-01-01T23:59:59.000Z

432

Vibration and Structural Response of Hybrid Wind Turbine Blades  

E-Print Network (OSTI)

Renewable energy is a serious alternative to deliver the energy needs of an increasing world population and improve economic activity. Wind energy provides better environmental and economic benefits in comparison with the other renewable energy sources. Wind energy is capable of providing 72 TW (TW = 10^12 W) of electric power, which is approximately four and half times the world energy consumption of 15.8 TW as reported in 2006. Since power output extracted from wind turbines is proportional to the square of the blade length and the cube of the wind speed, wind turbine size has grown rapidly in the last two decades to match the increase in power output. As the blade length increases, so does its weight opening up design possibilities to introduce hybrid glass and carbon fiber composite materials as lightweight structural load bearing alternatives. Herein, we investigate the feasibility of introducing modular composite tubulars as well as hybrid sandwich composite skins in the next generation blades. After selecting a target energy output, 8 MW with 80 m blade, airfoil geometry and the layup for the skin as well as internal reinforcements are proposed. They are incorporated into the computational blade via linear shell elements for the skin, and linear beam elements for the composite tubulars to assess the relationship between weight reduction and structural performance. Computational simulations are undertaken to understand the static and dynamic regimes; specifically, displacements, stresses, and vibration modes. The results showed that the composite layers did not exhibit any damage. However, in the balsa core of the sandwich skin, the von Mises stress exceeded its allowable at wind speeds ranging from 11.0 m/sec to 12.6 m/sec. In the blades with composite tubular reinforcement, two different types of damage are observed: a. Stress concentrations at the tubular-skin attachments, and b. Highest von Mises stress caused by the flapping bending moment. The vibration studies revealed a strong coupling mode, bending and twist, at the higher natural frequencies of the blade with tubular truss configuration. The weight saving measures in developing lighter blades in this study did not detract from the blades structural response for the selected load cases.

Nanami, Norimichi

2010-12-01T23:59:59.000Z

433

LS-4~ GROUND VIBRATION MEASUREMENTS NEAR THE SITE OF THE PROPOSED  

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

~ ~ GROUND VIBRATION MEASUREMENTS NEAR THE SITE OF THE PROPOSED ANL LIGHT SYNCHROTRON RADIATION FACILITY by D.L. McCown and R. Bowen Geoscience and Engineering Energy and Environmental Systems Division January 23, 1986 SUMMARY LS-4'l D. L. McCown/R. Bowen January 23, 1986 GROmm VIBRATION MEASUREMENTS REAR. 'l'IIE SITE OF 'l'IIE PROPOSED ANL LIGHT SYNCHROTRON RADIATION FACILITY Ground surface vibration measurements were conducted near the site of the proposed Light Source Radiation Facility in December, 1985 and early January, 1986 during "busy" and "quiet" periods of site activity. The preliminary analysis of the measurements indicates that ground vibrations (in the vertical) observed at the site are usually at frequencies below 800 Hz.

434

Particle Image Velocimetry Study on the Stripe Formation in Vertically Vibrated Granules  

E-Print Network (OSTI)

Recently, granules under vertical vibrations receive many attentions due to their importance in theoretical research and engineering application. In this paper, a two-dimensional Particle Image Velocimetry (PIV) system was ...

Deng, Rensheng

435

Quantum and classical vibrational relaxation dynamics of N-methylacetamide on ab initio potential energy surfaces  

E-Print Network (OSTI)

Employing extensive quantum-chemical calculations at the DFT/B3LYP and MP2 level, a quartic force field of isolated N-methylacetamide is constructed. Taking into account 24 vibrational degrees of freedom, the model is employed to perform numerically exact vibrational configuration interaction calculations of the vibrational energy relaxation of the amide I mode. It is found that the energy transfer pathways may sensitively depend on details of the theoretical description. Moreover, the exact reference calculations were used to study the applicability and accuracy of (i) the quasiclassical trajectory method, (ii) time-dependent second-order perturbation theory, and (iii) the instantaneous normal mode description of frequency fluctuations. Based on the results, several strategies to describe vibrational energy relaxation in biomolecular systems are discussed.

Fujisaki, Hiroshi; Hirao, Kimihiko; Straub, John E; Stock, Gerhard

2008-01-01T23:59:59.000Z

436

Active vibration reduction applied to the compressor of an air?conditioning unit for trams  

Science Conference Proceedings (OSTI)

Within the framework of the European Integrated Project InMAR (intelligent materials for active noise reduction)active vibration control and active structural acoustic control approaches are applied to an HVAC (heating

Joachim Bös; Enrico Janssen; Michael Kauba; Dirk Mayer

2008-01-01T23:59:59.000Z

437

Vertically-Vibrated Gas-Liquid Interfaces: Surface Deformation and Breakup  

E-Print Network (OSTI)

In his pioneering work of 1831, Faraday demonstrated that a vertically vibrated gas-liquid interface exhibits a period-doubling bifurcation from a flat state to a wavy configuration at certain frequencies or amplitudes. Typical experiments performed using thin layers of water produce "Faraday ripples", modest-amplitude nonlinear standing waves. Later experiments by Hashimoto and Sudo (1980) and Jameson (1966) as well as those performed in the present study show that much more dramatic disturbances can be generated at the gas-liquid free surface under certain ranges of vibration conditions. This breakup mechanism was examined experimentally using deep layers of polydimethylsiloxane (PDMS) silicone oils over a range of viscosity and sinusoidal, primarily axial vibration conditions that can produce dramatic disturbances at the gas-liquid free surface. Large-amplitude vibrations produce liquid jets into the gas, droplets pinching off from the jets, gas cavities in the liquid from droplet impact, and bubble transp...

O'Hern, T J; Brooks, C F; Shelden, B; Torczynski, J R; Kraynik, A M; Romero, L A; Benavides, G L

2010-01-01T23:59:59.000Z

438

Solvent and conformation dependence of amide I vibrations in peptides and proteins containing proline  

E-Print Network (OSTI)

We present a mixed quantum-classical model for studying the amide I vibrational dynamics (predominantly CO stretching) in peptides and proteins containing proline. There are existing models developed for determining ...

Roy, Santanu

439

Proceedings of the Fourteenth International Conference on Time-Resolved Vibrational Spectroscopy (TRVS XIV)  

E-Print Network (OSTI)

Abstracts of presentations made at the Fourteenth International Conference on Time-Resolved Vibrational Spectroscopy (TRVS XIV) held May 9-14, 2009 in Meredith, New Hampshire. TRVS is a series of biennial conferences ...

Tokmakoff, Andrei

2011-08-31T23:59:59.000Z

440

Vibration-Induced Conductivity Fluctuation Measurement for Soil Bulk Density Analysis  

E-Print Network (OSTI)

Soil bulk density affects water storage, water and nutrient movement, and plant root activity in the soil profile. Its measurement is difficult in field conditions. Vibration-induced conductivity fluctuation was investigated to quantify soil bulk density with possible field applications in the future. The AC electrical conductivity of soil was measured using a pair of blade-like electrodes while exposing the soil to periodic vibration. The blades were positioned longitudinally and transversally to the direction of the induced vibration to enable the calculation of a normalized index. The normalized index was expected to provide data independent from the vibration strength and to reduce the effect of soil salinity and water content. The experiment was conducted on natural and salinized fine sand at two moisture conditions and four bulk densities. The blade-shaped electrodes improved electrode-soil contact compared to cylindrical electrodes, and thereby, reduced measurement noise. Simulations on a simplified re...

Kishne, Andrea Sz; Chang, Hung-Chih; Kish, Laszlo B

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" 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

Vibration-to-electric energy conversion using a mechanically-varied capacitor  

E-Print Network (OSTI)

Past research in vibration energy harvesting has focused on the use of variable capacitors, magnets, or piezoelectric materials as the basis of energy transduction. How- ever, few of these studies have explored the detailed ...

Yen, Bernard Chih-Hsun, 1981-

2005-01-01T23:59:59.000Z

442

The low frequency 2D vibration sensor based on flat coil element  

SciTech Connect

Vibration like an earthquake is a phenomenon of physics. The characteristics of these vibrations can be used as an early warning system so as to reduce the loss or damage caused by earthquakes. In this paper, we introduced a new type of low frequency 2D vibration sensor based on flat coil element that we have developed. Its working principle is based on position change of a seismic mass that put in front of a flat coil element. The flat coil is a part of a LC oscillator; therefore, the change of seismic mass position will change its resonance frequency. The results of measurements of low frequency vibration sensor in the direction of the x axis and y axis gives the frequency range between 0.2 to 1.0 Hz.

Djamal, Mitra; Sanjaya, Edi; Islahudin; Ramli [Department of Physics, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40116 (Indonesia); Department of Physics, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40116 (Indonesia) and Department of Physics, UIN Syarif Hidayatullah, Jl. Ir.H. Djuanda 95 Ciputat 15412 (Indonesia); MTs NW Nurul Iman Kembang Kerang, Jl. Raya Mataram - Lb.Lombok, NTB (Indonesia); Department of Physics, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40116 (Indonesia) and Department of Physics,Universitas Negeri Padang, Jl. Prof. Hamka, Padang 25132 (Indonesia)

2012-06-20T23:59:59.000Z

443

Mooring Vibration as a Source of Current Meter Error and Its Correction  

Science Conference Proceedings (OSTI)

Data from instrumented moorings are used to show that rate underreading of Aanderaa paddle-wheel rotor current meters is a result of mooring vibration induced by vortex shedding from spherical in-line buoyancy. Direct evidence of this mooring ...

James M. Hamilton; George A. Fowler; Donald J. Belliveau

1997-06-01T23:59:59.000Z

444

Vibration mitigation in J-TEXT far-infrared diagnostic systems  

SciTech Connect

Optical structure stability is an important issue for far-infrared (FIR) phase measurements. To ensure good signal quality, influence of vibration should be minimized. Mechanical amelioration and optical optimization can be taken in turn to decrease vibration's influence and ensure acceptable measurement. J-TEXT (Joint Texal Experiment Tokamak, formerly TEXT-U) has two FIR diagnostic systems: a HCN interferometer system for electron density measurement and a three-wave polarimeter-interferometer system (POLARIS) for electron density and Faraday effect measurements. All use phase detection techniques. HCN interferometer system has almost eliminated the influence of vibration after mechanical amelioration and optical optimization. POLARIS also obtained first experimental results after mechanical stability improvements and is expected to further reduce vibration's influence on Faraday angle to 0.1 Degree-Sign after optical optimization.

Li, Q.; Chen, J.; Zhuang, G.; Wang, Z. J.; Gao, L.; Chen, W. [State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)

2012-10-15T23:59:59.000Z

445

Vibrations of a Hollow Nanosphere with a Porous Thin Shell in Liquid  

E-Print Network (OSTI)

*,, The Open Laboratory of Bond-Selective Chemistry, Departmental of Chemical Physics, University of Science time, Rayleigh3 discussed the flexural vibrations of an open shell or bowl, which is different from

Wu, Chi

446

Disentangling electronic and vibrational coherence in the Phycocyanin-645 light-harvesting complex  

E-Print Network (OSTI)

Energy transfer between chromophores in photosynthesis proceeds with near unity quantum efficiency. Understanding the precise mechanisms of these processes is made difficult by the complexity of the electronic structure and interactions with different vibrational modes. Two-dimensional spectroscopy has helped resolve some of the ambiguities and identified quantum effects that may be important for highly efficient energy transfer. Many questions remain, however, including whether the coherences observed are electronic and/or vibrational in nature and what role they play. We utilise a two-colour four-wave mixing experiment with control of the wavelength and polarization to selectively excite specific coherence pathways. For the light-harvesting complex PC645, from cryptophyte algae, we reveal and identify specific contributions from both electronic and vibrational coherences and determine an excited state structure based on two strongly-coupled electronic states and two vibrational modes. Separation of the cohe...

Richards, Gethin H; Curmi, Paul M G; Davis, Jeffrey A

2013-01-01T23:59:59.000Z

447

Finite-Temperature Hydrogen Adsorption/Desorption Thermodynamics Driven by Soft Vibration Modes  

Science Conference Proceedings (OSTI)

It is widely accepted that room-temperature hydrogen storage on nanostructured or porous materials requires enhanced dihydrogen adsorption. In this work we reveal that room-temperature hydrogen storage is possible not only by the enhanced adsorption, but also by making use of the vibrational free energy from soft vibration modes. These modes exist for example in the case of metallo-porphyrin-incorporated graphenes (M-PIGs) with out-of-plane ( buckled ) metal centers. There, the in-plane potential surfaces are flat because of multiple-orbital-coupling between hydrogen molecules and the buckled-metal centers. This study investigates the finite-temperature adsorption/desorption thermodynamics of hydrogen molecules adsorbed on M-PIGs by employing first-principles total energy and vibrational spectrum calculations. Our results suggest that the current design strategy for room-temperature hydrogen storage materials should be modified by explicitly taking finite-temperature vibration thermodynamics into account.

Woo, Sung-Jae [KAIST, Daejeon, Republic of Korea; Lee, Eui-Sup [KAIST, Daejeon, Republic of Korea; Yoon, Mina [ORNL; Yong-Hyun, Kim [KAIST, Daejeon, Republic of Korea

2013-01-01T23:59:59.000Z

448

A low-power circuit for piezoelectric vibration control by synchronized switching on voltage sources  

E-Print Network (OSTI)

In the paper, a vibration damping system powered by harvested energy with implementation of the so-called SSDV (synchronized switch damping on voltage source) technique is designed and investigated. In the semi-passive approach, the piezoelectric element is intermittently switched from open-circuit to specific impedance synchronously with the structural vibration. Due to this switching procedure, a phase difference appears between the strain induced by vibration and the resulting voltage, thus creating energy dissipation. By supplying the energy collected from the piezoelectric materials to the switching circuit, a new low-power device using the SSDV technique is proposed. Compared with the original self-powered SSDI (synchronized switch damping on inductor), such a device can significantly improve its performance of vibration control. Its effectiveness in the single-mode resonant damping of a composite beam is validated by the experimental results.

Shen, Hui; Ji, Hongli; Zhu, Kongjun; Balsi, Marco; Giorgio, Ivan; dell'Isola, Francesco

2010-01-01T23:59:59.000Z

449

Human Footprints on the Global Environment  

E-Print Network (OSTI)

Footprints on the Global Environment. By Rosa A. Eugene,Footprints on the Global Environment. MIT Press, 2010. xi +of its own impact on the environment that surrounds its

Ferrara, Enzo

2011-01-01T23:59:59.000Z

450

Program on Technology Innovation: Wireless Vibration Measurement of Low-Pressure Steam Turbine Blades  

Science Conference Proceedings (OSTI)

This report describes Phase 2 of a research and development effort to define a turbine blade vibration sensor (TBVS) system for measuring the mechanical vibrational spectrum of large steam turbine blades as they rotate. In Phase 1, the design concept and a number of alternative system components were considered for a wireless electronic device called a mote. In the Phase 2 research covered in this report, the final design of a custom accelerometer capable of operating under very high sustained centrifuga...

2010-12-22T23:59:59.000Z

451

On the axial dispersion induced by vibrations of a exible D. Brodaya,  

E-Print Network (OSTI)

dispersion of drugs in conduits of the cow's milk system is similar to gas dispersion in airways. Antibiotics that dispersion due to streaming eects in gas-®lled ¯exible tubes which vibrate in a long wave-length radial mode of enhancing dispersion in gas-®lled elastic tubes due to ¯ow induced by vibrations of the tube-walls. We

452

Strain-Based Turbine Generator Torsional Vibration Monitoring System - Phase 1: Concept Development  

Science Conference Proceedings (OSTI)

Shaft torsional vibration in large steam turbine-generator units is induced by transient grid disturbances and negative sequence currents. If undetected, these vibrations can accumulate fatigue damage in rotor elements such as turbine blades, couplings, and retaining rings. Shaft natural frequencies can be closely aligned with the predominant torsional excitation that occurs at twice the grid frequency, amplifying the resulting vibratory response. Calculation methods have evolved that predict shaft ...

2013-12-20T23:59:59.000Z

453

Program on Technology Innovation: Wireless Vibration Measurement of Turbine and Compressor Blades: Phase 3 -- Electronic System  

Science Conference Proceedings (OSTI)

This report describes Phase 3 of a multiphase research and development effort to define a turbine blade vibration sensor (TBVS) system for measuring the vibration spectrum of a complete row of operating large steam turbine or compressor blades. In Phase 1, the design concept and several alternative system components were considered for a wireless electronic device called a mote (see the Electric Power Research Institute [EPRI] report 1020697). In Phase 2, the design of a custom accelerometer capable of o...

2011-12-16T23:59:59.000Z

454

Program on Technology Innovation: Wireless Vibration Measurement of Turbine and Compressor Blades  

Science Conference Proceedings (OSTI)

This report describes Phase 4 of a multiyear research effort to develop a turbine blade vibration sensor (TBVS) system design. The sensor system application is the monitoring of the mechanical vibration spectrum of large steam turbine and compressor blades during operation. In Phase 1, the design concept as well as several alternative system components were considered for a wireless electronic device, called a mote. In Phase 2, the design parameters of a custom microelectromechanical (MEMS) ...

2012-12-12T23:59:59.000Z

455

3.0 EXISTING ENVIRONMENT  

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

0 EXISTING ENVIRONMENT 0 EXISTING ENVIRONMENT This chapter describes various components of the existing environment that may be affected by the operation of the Mound glass melter. The proposed action pctentially impacts air quality. surface water quality. biological resources. and human health and safety. In order to evaluate impacts to these resources. information on existing conditions is required. Section 3.1 presents information on atmospheric resources (e.g., meteorology and existing air quality) . Section 3.2 presents data on water resources, and Section 3.3 provides a broad characterization of biological resources. 3.1 ATMOSPHERIC RESOURCES Emissions from the glass melter potentially affect local and regional air quality. To evaluate impacts to these receptors, data on meteorologic conditions (particularly wind

456

Ariane Environment | Open Energy Information  

Open Energy Info (EERE)

Ariane Environment Ariane Environment Jump to: navigation, search Name Ariane Environment Place London, United Kingdom Zip W8 6JL Product String representation "Ariane Environm ... onmental value." is too long. Coordinates 51.506325°, -0.127144° 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":51.506325,"lon":-0.127144,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

457

Radiation Environment Assimilation Model (DREAM).  

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

DREAM tool increases space weather DREAM tool increases space weather predictions April 13, 2012 Predicting space weather improved by new DREAM modeling tool Earth's radiation belts can now be studied with a new modeling tool called Dynamic Radiation Environment Assimilation Model (DREAM). Researchers in LANL's Space Science and Applications (ISR-1) group are developing DREAM and described its current capabilities and applications in an article published in Space Weather, a journal of the American Geophysical Union. - 2 - Space environment and its hazards The space environment poses a number of radiation hazards to space systems and their occupants. Relativistic electrons, the dominant source of the radiation dose to spacecraft traveling in the outer radiation belts (3-7 Earth radii), have an electron flux

458

Low frequency long duration blast vibrations and their effect on residential structures  

Science Conference Proceedings (OSTI)

A study was conducted at a coal mine in India which produces 10 million tonne of coal and 27 million cubic meter of overburden per annum. Detonation of 100 tonnes of explosives in a blasting round is a common practice of the mine. These large sized blasts often led to complaints from the nearby inhabitants regarding ground vibrations and their affects on their houses. Eighteen dragline blasts were conducted and their impacts on nearby structures were investigated. Extended seismic arrays were used to identify the vibration characteristics within a few tens of meters of the blasts and also as modified by the media at distances over 5 km. 10 to 12 seismographs were deployed in an array to gather the time histories of vibrations. A signature blast was conducted to know the fundamental frequency of the particular transmitting media between the blast face and the structures. The faster decay of high frequency components was observed. It was also observed that at distances of 5 km, the persistence of vibrations in the structures was substantially increased by more than 10 seconds. The proximity of the frequency of the ground vibration to the structure's fundamental frequencies produced the resonance in the structures. On the basis of the fundamental frequency of the structures, the delay interval was optimized, which resulted in lower amplitude and reduced persistence of vibration in the structures. 9 refs., 10 figs., 2 tabs.

Roy, M.P.; Sirveiya, A.K.; Singh, P.K. [Central Mining Research Institute, Dhanbad (India). Blasting Dept.

2005-07-01T23:59:59.000Z

459

Interaction of highly vibrationally excited molecules with clean metal surfaces. Final technical report  

DOE Green Energy (OSTI)

The authors present results from a grant funded under the Department of Energy Office of Basic Energy Sciences. A collaboration between Prof. Alec Wodtke of the Department of Chemistry at UCSB and Daniel J. Auerbach of IBM Almaden Research Labs has allowed new experiments on the dynamics of surface chemical reactivity to be successfully executed. High quality data has been generated which provides an excellent test of theoretical models of surface reactivity, a topic of importance to catalysis. The authors have obtained the first experimental measurements on the influence of reactant velocity on the steric effect in a chemical reaction: the dissociative adsorption of hydrogen on copper. They have also designed and built a molecular beam scattering apparatus for the study of highly vibrationally excited molecules and their interactions with clean and oxidized metal surfaces. With this apparatus they have observed the vibrational energy exchange of highly vibrationally excited NO with an oxidized copper surface. Multi-quantum vibrational relaxation was found ({Delta}v = 1-5). Such remarkably strong and efficient vibrational energy transfer represents a qualitatively new phenomenon and is representative of the exciting new behavior that they had hoped might be observable in this project. Evidence of chemical reactivity of vibrationally excited NO on a clean copper surface was also found.

Wodtke, A.M. [Univ. of California, Santa Barbara, CA (United States). Dept. of Chemistry; Auerbach, D.J. [IBM Almaden Research Center, San Jose, CA (United States)

1998-11-01T23:59:59.000Z

460

Westminster Energy Environment Transport Forum | Open Energy...  

Open Energy Info (EERE)

Westminster Energy Environment Transport Forum Jump to: navigation, search Name Westminster Energy, Environment & Transport Forum Place United Kingdom Product String representation...

Note: This page contains sample records for the topic "random vibration environment" 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

Global Environment Facility (GEF) | Open Energy Information  

Open Energy Info (EERE)

Edit with form History Share this page on Facebook icon Twitter icon Global Environment Facility (GEF) Jump to: navigation, search Name Global Environment Facility Address...

462

Modeling thermal comfort in stratified environments  

E-Print Network (OSTI)

Arens E. , and Wang D. 2004. "Thermal sensation and comfortin transient non-uniform thermal environments", European7730, 1994, Moderate Thermal Environments – Determination of

Zhang, H.; Huizenga, C.; Arens, Edward A; Yu, T.

2005-01-01T23:59:59.000Z

463

Vibrational experiments at the HDR (Heissdampfreaktor) German/US cooperation  

Science Conference Proceedings (OSTI)

As part of an overall effort on the validation of seismic calculational methods, the US NRC/RES is collaborating with the Kernforschungszentrum Karlsruhe, FRG, in the vibrational/earthquake experiments conducted at the HDR (Heissdampfreaktor) Test Facility in Kahl/Main, FRG. In the most recent experiments (SHAG), high level excitations were produced in the HDR by means of an eccentric-mass coastdown shaker capable of developing 1000 tons of force. The purpose of the experiments was to investigate full-scale structural response, soil-structure interaction, and piping and equipment response. Data obtained in the tests serve to evaluate analysis methods. In the SHAG experiments, loadings of the HDR soil-structure system approached incipient failure levels as evidenced by high peak accelerations and displacements, local damage, nonlinear behavior, soil subsidence, and wall strains which exceeded estimated limit values. Also, the performance of different pipe hanger configurations for the VKL piping system was compared in these tests under high excitation levels. The support configurations ranged from very rigid systems (strut/snubbers) to very flexible configurations (spring and constant force supports). Pretest and post-test analyses for the building/soil and piping response were performed and are being validated with the test data.

Kot, C.A.; Malcher, L.; Costello, J.F.

1987-04-01T23:59:59.000Z

464

Yucca Mountain and The Environment  

Science Conference Proceedings (OSTI)

The Yucca Mountain Project places a high priority on protecting the environment. To ensure compliance with all state and federal environmental laws and regulations, the Project established an Environmental Management System. Important elements of the Environmental Management System include the following: (1) monitoring air, water, and other natural resources; (2) protecting plant and animal species by minimizing land disturbance; (3) restoring vegetation and wildlife habitat in disturbed areas; (4) protecting cultural resources; (5) minimizing waste, preventing pollution, and promoting environmental awareness; and (6) managing of hazardous and non-hazardous waste. Reducing the impacts of Project activities on the environment will continue for the duration of the Project.

NA

2005-04-12T23:59:59.000Z

465

Modular, automated software testing environment  

SciTech Connect

A software development methodology has been developed with Softool's Change and Configuration Control (CCC) environment. Fundamental to this approach is the exclusion of all development activities from the CCC data base. The contents of the CCC data base are restricted to software which has passed appropriate reviews. Development activities are performed in the host operating system account of various programmers. A set of CCC macros and VUS command files support this methodology, thereby allowing the configuration manager to transfer files between the development and configuration management environments. 3 refs.

Cort, G.; Nelson, R.O.

1986-01-01T23:59:59.000Z

466

Trade and the environment: Discussion  

Science Conference Proceedings (OSTI)

The author presents a synopsis of several papers on the issue of international trade and the environment. The papers address the following topics: the complex interrelationships of international trade, environment, and poverty in developing countries; environmental aspects of economic relations between nations; and the debate between environmentalists and free trade advocates. The author also adds comments about the US embargo on Mexican yellow-fin tuna imports, concluding that this unilateral embargo action, while initially creating tentions, may have provided a useful impetus to working out a multinational environmental standard.

Lutz, E.

1992-12-01T23:59:59.000Z

467

BNL | Climate, Environment and Bisoscience  

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

Climate, Environment, and Biosciences Climate, Environment, and Biosciences bioscience research Revealing Nature-from Microscopic to Atmospheric Scales With recognized expertise in plant sciences, imaging, and climate studies, Brookhaven Lab advances some of the most promising scientific methods of achieving a sustainable future. This cross-disciplinary research seeks to understand the relationships between climate change, sustainable energy initiatives, and the planet's natural ecosystems. As environmental and economic issues mount, this research will provide increasingly important guidance and opportunities for climate change management strategies, approaches to adaptation, and policy decisions. Building a Sustainable Future Major goals include: Significantly improving climate models based on high-quality data

468

Environment  

Science Conference Proceedings (OSTI)

Table 7   Pressure vessel steels for high-temperature service...composition Normal temperature range of usage Allowable stress at low end of usage temperature Allowable stress at high end of usage temperature °C °F MPa ksi MPa ksi SA 204, grade C 0.28% C max; 0.45â??0.60% Mo 430â??510 800â??950 130 18.8 57 8.2 SA 302, grade B 0.25% C max; 1.15â??1.50% Mn;...

469

Central limit theorem for a many-server queue with random service rates  

E-Print Network (OSTI)

Given a random variable $N$ with values in ${\\mathbb{N}}$, and $N$ i.i.d. positive random variables $\\{\\mu_k\\}$, we consider a queue with renewal arrivals and $N$ exponential servers, where server $k$ serves at rate $\\mu_k$, under two work conserving routing schemes. In the first, the service rates $\\{\\mu_k\\}$ need not be known to the router, and each customer to arrive at a time when some servers are idle is routed to the server that has been idle for the longest time (or otherwise it is queued). In the second, the service rates are known to the router, and a customer that arrives to find idle servers is routed to the one whose service rate is greatest. In the many-server heavy traffic regime of Halfin and Whitt, the process that represents the number of customers in the system is shown to converge to a one-dimensional diffusion with a random drift coefficient, where the law of the drift depends on the routing scheme. A related result is also provided for nonrandom environments.

Atar, Rami

2008-01-01T23:59:59.000Z

470

Generating Multivariate Nonnormal Distribution Random Numbers Based on Copula Function  

E-Print Network (OSTI)

Abstract. Random numbers of multivariate nonnormal distribution are strongly requested by the area of theoretic research and application in practice. A new algorithm of generating multivariate nonnormal distribution random numbers is given based on the Copula function, and theoretic analysis suggests that the algorithm is suitable to be feasible. Furthermore, simulation shows that the empirical distribution which is formed by random numbers generating from the proposed algorithm can well approach the original distribution.

Xiaoping Hu; Jianmin He; Hongsheng Ly

2006-01-01T23:59:59.000Z

471

Single Min-Entropy Random Source can be Amplified  

E-Print Network (OSTI)

Expansion and amplification of weak randomness with the help of untrusted quantum devices is a hot topic of current research. Here we contribute with a procedure for amplifying a single weak random source with the help of tri-partite GHZ-type entangled states. If the quality of the source measured in min-entropy rate reaches a fixed threshold $log_2(\\sqrt{3})$, perfect random bits can be produced. Presented procedure works well also on locally bit-fixing random sources, which cannot be characterized as Santha--Vazirani sources and thus using existing amplification procedures cannot be applied.

Martin Plesch; Matej Pivoluska

2013-05-05T23:59:59.000Z

472

Dislocation Glide through Non-randomly Distributed Point Obstacles  

Science Conference Proceedings (OSTI)

Presentation Title, Dislocation Glide through Non-randomly Distributed Point ... Changing the Paradigm for Engineering Design by Merging High Energy X-ray ...

473

Jordan-algebraic aspects of optimization:randomization  

E-Print Network (OSTI)

Jul 7, 2007 ... Abstract: We describe a version of randomization technique within a general framework of Euclidean Jordan algebras. It is shown how to use ...

474

Organising software in active environments  

Science Conference Proceedings (OSTI)

In this paper, we investigate the use of logic-based multi-agent systems for modelling active environments. Our case study is an intelligent support system for a so-called “active museum”. We show the approach of structuring the “agent ...

Benjamin Hirsch; Michael Fisher; Chiara Ghidini; Paolo Busetta

2004-09-01T23:59:59.000Z

475

Transportation environment data bank index  

SciTech Connect

In an effort to determine the environment intensities to which shipping containers will be exposed, a ''Data Bank'' of environmental information has been established by Sandia Laboratories, Division 1285 for the ERDA Division of Environmental Control Technology. This document is an index which can be used to request data of interest. (auth)

Davidson, C.A.; Foley, J.T.

1976-02-01T23:59:59.000Z

476

Empathy in virtual learning environments  

Science Conference Proceedings (OSTI)

How do we engage teachers and learners in the learning process and what are the benefits of this? How do we get students to learn? Many academic institutions of all levels are asking these questions. Throughout the years new teaching methodologies ... Keywords: Second Life, VLEs, e-learning, empathy, engagement, online learning, teaching methodologies, virtual learning environments

Judith Molka-Danielsen; Bryan W. Carter; Alastair Creelman

2009-02-01T23:59:59.000Z

477

Virtual Human Problem Solving Environments  

SciTech Connect

Abstract. Interest in complex integrated digital or virtual human modeling has seen a significant increase over the last decade. Coincident with that increased interest, Oak Ridge National Laboratory (ORNL) initiated the development of a human simulation tool, the Virtual Human. The Virtual Human includes a problem-solving environment (PSE) for implementing the integration of physiological models in different programming languages and connecting physiological function to anatomy. The Virtual Human PSE (VHPSE) provides the computational framework with which to develop the concept of a "Virtual Human." Supporting the framework is a data definition for modeling parameters, PhysioML, a Virtual Human Database (VHDB), and a Web-based graphical user interface (GUI) developed using Java. Following description of the VHPSE, we discuss four example implementations of models within the framework. Further expansion of a human modeling environment was carried out in the Defense Advanced Research Projects Agency Virtual Soldier Project. SCIRun served as the Virtual Soldier problem solving environment (VSPSE). We review and compare specific developments in these projects that have significant potential for the future of Virtual Human modeling and simulation. We conclude with an evaluation of areas of future work that will provide important extensions to the VHPSE and VSPSE and make possible a fully-integrated environment for human anatomical and physiological modeling: the Virtual Human.

Ward, Richard C [ORNL; Pouchard, Line Catherine [ORNL; Munro, Nancy B [ORNL; Fischer, Sarah Kathleen [ORNL

2008-01-01T23:59:59.000Z

478

Fender system behavior in random seas  

E-Print Network (OSTI)

Fendering systems are widely used in offshore installations for attenuating the effects of the impact energy of ships and barges in berthing or moored conditions. This study focuses on investigating current design practices and, developing a rational and functional approach to address random loading effects exerted on fendering systems. These loadings are often a consequence of combined wind, wave and current excitation as well as more controlled vessel motions. Dimensional analysis is used to investigate the degree to which empirical design data can be collapsed and to provide an indication of the nonlinearity associated with the empirical data for fender sizing. In addition, model test data specifically measuring the normal fender force for a coupled mini-TLP/Tender Barge performed at the Offshore Technology Research Center (OTRC) model basin is used in this research investigation.. This data was characterized in terms of the typical statistical moments, which include the mean, standard deviation, skewness and kurtosis. The maxima and extreme values are extracted from the fender response data based upon a zero-crossing analysis and the results were studied in order to determine the underlying probability distribution function. Using selected parameter estimation techniques, coefficients of a best-fit two parameter model were determined. An illustrative example is presented and discussed that contrasts the deterministic and probabilistic models.

Ofoegbu, James Nwachukwu

2008-08-01T23:59:59.000Z

479

Collisions of particles advected in random flows  

E-Print Network (OSTI)

We consider collisions of particles advected in a fluid. As already pointed out by Smoluchowski [Z. f. physik. Chemie XCII, 129-168, (1917)], macroscopic motion of the fluid can significantly enhance the frequency of collisions between the suspended particles. This effect was invoked by Saffman and Turner [J. Fluid Mech. 1, 16-30, (1956)] to estimate collision rates of small water droplets in turbulent rain clouds, the macroscopic motion being caused by turbulence. Here we show that the Saffman-Turner theory is unsatisfactory because it describes an initial transient only. The reason for this failure is that the local flow in the vicinity of a particle is treated as if it were a steady hyperbolic flow, whereas in reality it must fluctuate. We derive exact expressions for the steady-state collision rate for particles suspended in rapidly fluctuating random flows and compute how this steady state is approached. For incompressible flows, the Saffman-Turner expression is an upper bound.

K. Gustavsson; B. Mehlig; M. Wilkinson

2008-01-18T23:59:59.000Z

480

Unmixing hyperspectral images using Markov random fields  

SciTech Connect

This paper proposes a new spectral unmixing strategy based on the normal compositional model that exploits the spatial correlations between the image pixels. The pure materials (referred to as endmembers) contained in the image are assumed to be available (they can be obtained by using an appropriate endmember extraction algorithm), while the corresponding fractions (referred to as abundances) are estimated by the proposed algorithm. Due to physical constraints, the abundances have to satisfy positivity and sum-to-one constraints. The image is divided into homogeneous distinct regions having the same statistical properties for the abundance coefficients. The spatial dependencies within each class are modeled thanks to Potts-Markov random fields. Within a Bayesian framework, prior distributions for the abundances and the associated hyperparameters are introduced. A reparametrization of the abundance coefficients is proposed to handle the physical constraints (positivity and sum-to-one) inherent to hyperspectral imagery. The parameters (abundances), hyperparameters (abundance mean and variance for each class) and the classification map indicating the classes of all pixels in the image are inferred from the resulting joint posterior distribution. To overcome the complexity of the joint posterior distribution, Markov chain Monte Carlo methods are used to generate samples asymptotically distributed according to the joint posterior of interest. Simulations conducted on synthetic and real data are presented to illustrate the performance of the proposed algorithm.

Eches, Olivier; Dobigeon, Nicolas; Tourneret, Jean-Yves [University of Toulouse, IRIT/INP-ENSEEIHT, 2 rue Camichel, 31071 Toulouse cedex 7 (France)

2011-03-14T23:59:59.000Z

Note: This page contains sample records for the topic "random vibration environment" from the National Library of EnergyBeta (NLEBeta).
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481

Environment/Climate Programs and Projects  

Science Conference Proceedings (OSTI)

... separate interlaboratory comparison exercises for environmental contaminants in ... Organic Contaminants in the Marine Environment Last Updated ...

2010-09-22T23:59:59.000Z

482

Scaffold Gradients: Finding the Right Environment for ...  

Science Conference Proceedings (OSTI)

Scaffold Gradients: Finding the Right Environment for Developing Cells. For Immediate Release: May 25, 2010. ...

2013-05-14T23:59:59.000Z

483

Conservative chaotic map as a model of quantum many-body environment  

E-Print Network (OSTI)

We study the dynamics of the entanglement between two qubits coupled to a common chaotic environment, described by the quantum kicked rotator model. We show that the kicked rotator, which is a single-particle deterministic dynamical system, can reproduce the effects of a pure dephasing many-body bath. Indeed, in the semiclassical limit the interaction with the kicked rotator can be described as a random phase-kick, so that decoherence is induced in the two-qubit system. We also show that our model can efficiently simulate non-Markovian environments.

Davide Rossini; Giuliano Benenti; Giulio Casati

2006-06-08T23:59:59.000Z

484

Environment-Assisted Error Correction of Single-Qubit Phase Damping  

E-Print Network (OSTI)

Open quantum system dynamics of random unitary type may in principle be fully undone. Closely following the scheme of environment-assisted error correction proposed by Gregoratti and Werner [M. Gregoratti and R. F. Werner, J. Mod. Opt. 50(6), 915-933 (2003)], we explicitly carry out all steps needed to invert a phase-damping error on a single qubit. Furthermore, we extend the scheme to a mixed-state environment. Surprisingly, we find cases for which the uncorrected state is closer to the desired state than any of the corrected ones.

Benjamin Trendelkamp-Schroer; Julius Helm; Walter T. Strunz

2011-10-21T23:59:59.000Z

485

An application of regression model for evaluation of blast vibration in an opencast coal mine: a case analysis  

Science Conference Proceedings (OSTI)

Different models of vibration studies are examined. A case analysis to determine the parameters governing the prediction of blast vibration in an opencast coal mine is described. A regression model was developed to evaluate peak particle velocity (PPV) of the blast. The results are applicable to forecasting ground vibration before blasting and to the design of various parameters in controlled blasting. 16 refs., 1 fig., 1 tab.

Brahma, K.C.; Pal, B.K.; Das, C. [CMPDI, Bhubaneswar (India)

2005-07-01T23:59:59.000Z

486

Environment and Nuclear Programs | Department of Energy  

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

Environment and Nuclear Programs Environment and Nuclear Programs Environment and Nuclear Programs Cooling Tower Reflection | Credit: DOE Archives Cooling Tower Reflection | Credit: DOE Archives Offices of the Deputy General Counsel for Environment and Nuclear Programs Office of the Assistant General Counsel for Environment (GC-51) Office of the Assistant General Counsel for Civilian Nuclear Programs (GC-52 ) Office of the Assistant General Counsel for International and National Security Programs (GC-53) Office of NEPA Policy and Compliance (GC-54) Office of Standard Contract Management (GC-55) Litigation and Enforcement Environment and Nuclear Programs Environment Civilian Nuclear Programs International and National Security Programs NEPA Policy and Compliance Standard Contract Management Technology Transfer and Procurement

487

The Built Environment and Migration: A Case Study of Mexico  

E-Print Network (OSTI)

iv Introduction The built environment expresses the changingThe Built Environment & Migration: A Case Study in MexicoEnvironment.

Ramirez, Rosa

2009-01-01T23:59:59.000Z

488

Vibration energy harvesting from random force and motion excitations This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network (OSTI)

Design Considerations for a Universal Smart Energy Module for Energy Harvesting in Wireless Sensor. It supports a wide range of energy harvesters and energy storage systems. The focus is on the efficient to a few years at most. Energy harvesting is a suitable solution for a potentially unlimited lifetime

Zuo, Lei

489

Office of the Assistant General Counsel for Environment | Department...  

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

Environment Office of the Assistant General Counsel for Environment Litigation and Enforcement Environment and Nuclear Programs Environment Civilian Nuclear Programs International...

490

Bounds for scaling exponents for a 1+1 dimensional directed polymer in a Brownian environment  

E-Print Network (OSTI)

We study the scaling exponents of a 1+1-dimensional directed polymer in a Brownian random environment introduced by O'Connell and Yor. For a version of the model with boundary conditions that are stationary in a space-time sense we identify the exact values of the exponents. For the version without the boundary conditions we get the conjectured upper bounds on the exponents.

Timo Seppäläinen; Benedek Valkó

2010-06-24T23:59:59.000Z

491

The discrete fractional random cosine and sine transforms  

E-Print Network (OSTI)

Based on the discrete fractional random transform (DFRNT), we present the discrete fractional random cosine and sine transforms (DFRNCT and DFRNST). We demonstrate that the DFRNCT and DFRNST can be regarded as special kinds of DFRNT and thus their mathematical properties are inherited from the DFRNT. Numeral results of DFRNCT and DFRNST for one and two dimensional functions have been given.

Zhengjun Liu; Qing Guo; Shutian Liu

2006-05-22T23:59:59.000Z

492

Long correlation Gaussian random fields: Parameter estimation and noise reduction  

Science Conference Proceedings (OSTI)

In this paper, a parametric model for Gaussian random fields (GRFs) with long-correlation feature, namely the long correlation GRF (LC-GRF), is studied. Important properties of the model are derived and used for developing new parameter estimation algorithms ... Keywords: Expectation--maximization (EM) algorithm, Gaussian random fields (GRF), Maximum likelihood estimation (MLE), Noise reduction, Wiener filter

C. F. Caiafa; A. N. Proto; E. E. Kuruo?lu

2007-07-01T23:59:59.000Z

493

Stochastic velocity motions and processes with random time  

E-Print Network (OSTI)

The aim of this paper is to analyze a class of random motions which models the motion of a particle on the real line with random velocity and subject to the action of the friction. The speed randomly changes when a Poissonian event occurs. We study the characteristic and the moment generating function of the position reached by the particle at time $t>0$. We are able to derive the explicit probability distributions in few cases for which discuss the connections with the random flights. The moments are also widely analyzed. For the random motions having an explicit density law, further interesting probabilistic interpretations emerge if we deal with them varying up a random time. Essentially, we consider two different type of random times, namely Bessel and Gamma times, which contain, as particular cases, some important probability distributions (e.g. Gaussian, Exponential). In particular, for the random processes built by means of these compositions, we derive the probability distributions fixed the number of...

De Gregorio, Alessandro

2009-01-01T23:59:59.000Z

494

Reconstructing phylogenetic trees of prokaryote genomes by randomly sampling oligopeptides  

Science Conference Proceedings (OSTI)

In this paper, we propose a method for reconstructing phylogenetic trees of a given set of prokaryote organisms by randomly sampling relatively small oligopeptides of a fixed length from their complete proteomes. For each of the organisms, a vector of ... Keywords: bioinformatics, evolution, microbial organisms, oligopeptide frequency, phylogenetic tree reconstruction, phylogenetic trees, prokaryote genomes, random sampling

Osamu Maruyama; Akiko Matsuda; Satoru Kuhara

2005-12-01T23:59:59.000Z

495

Verifiable Random Functions from Identity-based Key Encapsulation  

E-Print Network (OSTI)

encapsulation mechanisms (IB-KEM) that we call VRF suitable. Informally, an IB-KEM is VRF suitable by Micali, Rabin and Vadhan [21]. Informally a VRF is something that behaves like a random function but also into a VRF using the Goldreich-Levin [15] theorem to "extract" random bits. Unfortunately, however, the VRF

Catalano, Dario

496

Pricing Discretely Monitored Asian Options by Maturity Randomization  

Science Conference Proceedings (OSTI)

We present a new methodology based on maturity randomization to price discretely monitored arithmetic Asian options when the underlying asset evolves according to a generic Lévy process. Our randomization technique considers the option expiry ... Keywords: Asian option, Lévy process, discrete monitoring, fast Fourier transform, integral equation, option pricing, quadrature formula

Gianluca Fusai; Daniele Marazzina; Marina Marena

2011-01-01T23:59:59.000Z

497

Quasi-random initial population for genetic algorithms  

Science Conference Proceedings (OSTI)

The selection of the initial population in a population-based heuristic optimizationmethod is important, since it affects the search for several iterations and often has an influence on the final solution. If no a priori information about the optima ... Keywords: Genetic algorithms, Global continuous optimization, Quasi-random sequences, Random numbers

H. Maaranen; K. Miettinen; M. M. Mäkelä

2004-06-01T23:59:59.000Z

498

Randomization tests for distinguishing social influence and homophily effects  

Science Conference Proceedings (OSTI)

Relational autocorrelation is ubiquitous in relational domains. This observed correlation between class labels of linked instances in a network (e.g., two friends are more likely to share political beliefs than two randomly selected people) can be due ... Keywords: homophily, randomization, social influence, social networks

Timothy La Fond; Jennifer Neville

2010-04-01T23:59:59.000Z

499

Probability Distribution of Curvatures of Isosurfaces in Gaussian Random Fields  

E-Print Network (OSTI)

An expression for the joint probability distribution of the principal curvatures at an arbitrary point in the ensemble of isosurfaces defined on isotropic Gaussian random fields on Rn is derived. The result is obtained by deriving symmetry properties of the ensemble of second derivative matrices of isotropic Gaussian random fields akin to those of the Gaussian orthogonal ensemble.

Paulo R. S. Mendonca; Rahul Bhotika; James V. Miller

2007-02-09T23:59:59.000Z

500

RNEDE: Resilient Network Design Environment  

SciTech Connect

Modern living is more and more dependent on the intricate web of