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Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Dynamic thermal modelling of a power integrated circuit with the application of structure functions  

Science Conference Proceedings (OSTI)

This paper presents dynamic thermal analyses of a power integrated circuit with a cooling assembly. The investigations are based on the examination of the cumulative and differential structure functions obtained from the circuit cooling curves recorded ... Keywords: Contact thermal resistance, Heat transfer coefficient, Structure function, Thermal modelling and simulation

Marcin Janicki; Jedrzej Banaszczyk; Gilbert De Mey; Marek Kaminski; Bjorn Vermeersch; Andrzej Napieralski

2009-07-01T23:59:59.000Z

2

A Dynamic Thermal Circuit Rating (DTCR) Thermal Parameter Database for Substation Terminal Equipment  

Science Conference Proceedings (OSTI)

EPRI's DTCR (Dynamic Thermal Circuit Rating) software uses real-time or historical weather and electrical load data to calculate power equipment ratings for overhead lines, underground cables, power transformers, and substation terminal equipment. This technical update concerns the organization of a thermal parameter database for substation terminal equipment intended to simplify the documentation and access to the data required for rating calculations. This update contains an organized and partly popula...

2008-02-25T23:59:59.000Z

3

Optical dynamic circuit services  

Science Conference Proceedings (OSTI)

IP service, leased-line service and POTS service have been the three long-standing communication service offerings of providers. Recently, both commercial and research-andeducation network providers have started offering optical dynamic circuit services. ...

Malathi Veeraraghavan; Mark Karol; George Clapp

2010-11-01T23:59:59.000Z

4

Description and Software Implementation for British Columbia Hydro’s Application of EPRI’s Dynamic Thermal Circuit Ratin g System  

Science Conference Proceedings (OSTI)

This report describes the functional changes needed to use the Electric Power Research Institutes (EPRIs) dynamic thermal circuit rating (DTCR) software to support a thermal model and real-time data input for thermally isolated (that is, single-phase) submarine alternating current power cables as part of a DTCR field test project for British Columbia (BC) Hydro. The report further describes some of the software implementation details and results of calculations based on field data provided by BC Hydro.

2011-04-05T23:59:59.000Z

5

Application of Extruded Dielectric Cable Model in the Dynamic Thermal Circuit Rating (DTCR) System for San Diego Gas & Electric's Ot ay Mesa Power Loop Project  

Science Conference Proceedings (OSTI)

Due to limited incentives for new construction, utilities around the world are undergoing a major transformation that is redefining the use of existing power equipment in the electric transmission network. Under these circumstances, utilities are forced to find new ways to increase power flow through the existing transmission corridors with minimal investments. This report addresses the application of the Electric Power Research Institute's (EPRI's) Dynamic Thermal Circuit Rating (DTCR) program to San Di...

2010-02-02T23:59:59.000Z

6

Quantifying Dynamic Stability of Genetic Memory Circuits  

Science Conference Proceedings (OSTI)

Bistability/Multistability has been found in many biological systems including genetic memory circuits. Proper characterization of system stability helps to understand biological functions and has potential applications in fields such as synthetic biology. ... Keywords: Dynamic stability, genetic memory, gene circuit, dynamic noise margin.

Yong Zhang; Peng Li; Garng Huang

2012-05-01T23:59:59.000Z

7

High performance low power CMOS dynamic logic for arithmetic circuits  

Science Conference Proceedings (OSTI)

This paper presents the design of high performance and low power arithmetic circuits using a new CMOS dynamic logic family, and analyzes its sensitivity against technology parameters for practical applications. The proposed dynamic logic family allows ... Keywords: CMOS digital integrated circuits, CMOS logic circuits, Dynamic logic, High speed arithmetic circuits, Low power arithmetic circuits

Victor Navarro-Botello; Juan A. Montiel-Nelson; Saeid Nooshabadi

2007-04-01T23:59:59.000Z

8

How to efficiently implement dynamic circuit specialization systems  

Science Conference Proceedings (OSTI)

Dynamic circuit specialization (DCS) is a technique used to implement FPGA applications where some of the input data, called parameters, change slowly compared to other inputs. Each time the parameter values change, the FPGA is reconfigured by a configuration ... Keywords: Boolean Network evaluation, FPGA, dynamic circuit specialization, runtime reconfiguration

Fatma Abouelella; Tom Davidson; Wim Meeus; Karel Bruneel; Dirk Stroobandt

2013-07-01T23:59:59.000Z

9

Dynamical Systems in Circuit Designer's Eyes  

SciTech Connect

Examples of nonlinear circuit design are given. Focus of the design process is on theory and engineering methods (as opposed to numerical analysis). Modeling is related to measurements It is seen that the phase plane is still very useful with proper models Harmonic balance/describing function offers powerful insight (via the combination of simulation with circuit and ODE theory). Measurement and simulation capabilities increased, especially harmonics measurements (since sinusoids are easy to generate)

Odyniec, M.

2011-05-09T23:59:59.000Z

10

Superconducting Circuits for Quantum Simulation of Dynamical Gauge Fields  

E-Print Network (OSTI)

We describe a superconducting-circuit lattice design for the implementation and simulation of dynamical lattice gauge theories. We illustrate our proposal by analyzing a one-dimensional U(1) quantum-link model, where superconducting qubits play the role of matter fields on the lattice sites and the gauge fields are represented by two coupled microwave resonators on each link between neighboring sites. A detailed analysis of a minimal experimental protocol for probing the physics related to string breaking effects shows that despite the presence of decoherence in these systems, distinctive phenomena from condensed-matter and high-energy physics can be visualized with state-of-the-art technology in small superconducting-circuit arrays.

D. Marcos; P. Rabl; E. Rico; P. Zoller

2013-06-07T23:59:59.000Z

11

Thermal-Aware CAD for Modern Integrated Circuits  

E-Print Network (OSTI)

Thermal Background 3.1 HeatExperiments 9.1 Thermal-Floorplanning9.1.1 Fast Thermal Floorplanning . . . . . . . . . . .

Logan, Sheldon Logan Paul

2013-01-01T23:59:59.000Z

12

Dynamically Tunable Memory in Two-Component Gene Circuit  

SciTech Connect

Cell has the potential to remember the environmental conditions for many (10{sup 7}) generations but stochastic fluctuations set a fundamental limit on the stability of this memory. Here we explicitly take the binding-unbinding of macromolecules into account to propose a novel rationale for the protein-protein interaction in cell physiology. Based on the first-exit time and the corresponding deterministic characterization of various genetic circuits, we show that the reversible binding dynamics may stabilize non-genetically inherited cell states, providing a practical strategy for designing robust epigenetic memory.

Ghim, C; Almaas, E

2008-09-05T23:59:59.000Z

13

Addressing thermal and power delivery bottlenecks in 3D circuits  

Science Conference Proceedings (OSTI)

The enhanced packing densities facilitated by 3D integrated circuit technology also has an unwanted side-effect, in the form of increasing the amount of current per unit footprint of the chip, as compared to a 2D design. This has ramifications on two ...

Sachin S. Sapatnekar

2009-01-01T23:59:59.000Z

14

Transmission Line Inspires A New Distributed Algorithm to Solve the Nonlinear Dynamical System of Physical Circuit  

E-Print Network (OSTI)

As known, physical circuits, e.g. integrated circuits or power system, work in a distributed manner, but these circuits could not be easily simulated in a distributed way. This is mainly because that the dynamical system of physical circuits is nonlinear and the linearized system of physical circuits is non-symmetrical. This paper proposes a simple and natural strategy to simulate the physical circuit in parallel, by mimicking the internal wires or interconnects inside the circuits by distributed numerical algorithm. Mimic Transmission Method (MTM) is a new distributed numerical algorithm to solve the nonlinear ordinary differential equations extracted from physical circuits. It maps the transmission delay of interconnects between subcircuits to the communication delay of digital data link between processors. MTM is not a global iterative algorithm, and it does only one distributed computation at each time window to obtain accurate result, so unconvergence issues do not need to be worried about.

Wei, Fei

2010-01-01T23:59:59.000Z

15

Timing, energy, and thermal performance of three-dimensional integrated circuits  

E-Print Network (OSTI)

We examine the performance of custom circuits in an emerging technology known as three-dimensional integration. By combining multiple device layers with a high-density inter-layer interconnect, 3-D integration of a given circuit is expected to provide better timing and energy performance relative to a single-wafer implementation of the same circuit. In this paper, we show that by using our performance-driven design tool for 3-D ICs, the interconnect energy dissipation of standard-cell circuits can be reduced by 24% to 42 % using two to five device layers respectively. Similarly, the interconnect energy-delay product can be reduced by 30 % to 50%. At the same time, thermal performance in 3-D ICs is expected to be a critical issue. By incorporating thermal management and analysis into our placement tool, we may investigate the thermal scalability of 3-D integration. We find that the thermal performance actually can be improved with the use of a modest number of additional device layers. Also, we show that the absolute die temperature can be controlled through the use of extra silicon.

Shamik Das; Anantha Ch; Rafael Reif

2004-01-01T23:59:59.000Z

16

Time-stepping numerical simulation of switched circuits within the nonsmooth dynamical systems approach  

Science Conference Proceedings (OSTI)

The numerical integration of switching circuits is known to be a tough issue when the number of switches is large, or when sliding modes exist. Then, classical analog simulators may behave poorly, or even fail. In this paper, it is shown on two examples ... Keywords: analog simulation, backward Euler algorithm, complementarity dynamical systems, complementarity problems, multivalued systems, power converters, switching circuits, unilateral state constraints

Vincent Acary; Olivier Bonnefon; Bernard Brogliato

2010-07-01T23:59:59.000Z

17

Time-domain non-Monte Carlo noise simulation for nonlinear dynamic circuits with arbitrary excitations  

Science Conference Proceedings (OSTI)

A new, time-domain, non-Monte Carlo method for computer simulation of electrical noise in nonlinear dynamic circuits with arbitrary excitations is presented. This time-domain noise simulation ...

Alper Demir; Edward W. Y. Liu; Alberto L. Sangiovanni-Vincentelli

1994-11-01T23:59:59.000Z

18

Integration of thickener underflow into thermal dryer circuit. Final report  

SciTech Connect

A large number of coal preparation plants in the United States are troubled with coal fines and associated plant operation problems. As part of their process, these plants use thermal dryers for producing product coal, cyclones for first-stage recovery of coal fines, and wet scrubbers for the second-stage removal of coal fines carry-over from the dryer exhaust gas. The first challenge for these plants is to recover the clean ultra-fine coal captured in the scrubbers rather than to dispose of it in settling ponds. The second challenge is to mitigate the over-dry fine coal dusting problems in the dryer product. Prior to the completion of this program, the difficulties of the first challenge involving the recovery and use of fine clean coal from the thermal dryer scrubber effluent had not been solved. The second challenge, controlling fine coal dusting, was previously met by applying a solution of surfactants and process water to the over-dry coal fraction. As a result of the demonstration provided by the performance of this program, the implementation of a simple process improvement, involving the use of a thickener in combination with a belt press, simultaneously solved both challenges: the de-dusting and the dryer scrubber effluent recovery issues. The objective of this project was to: (1) Use a clean coal thickener with a squeeze belt press to recover the ultra-fine coal in dryer scrubber effluent; (2) Demonstrate that the coal-water mixture (CWM) produced from scrubber sludge of a thermal dryer can be used as a dust suppressant. The thickener/belt press system has increased the production of JWRI Mine Number 4 by approximately 0.7%. This production increase was accomplished by recovering and re-using 3 metric tons/hr (3.3 tons/hr) of coal fines that were previously sent to holding ponds, returning this as a 50% CWM to de-dust the 430 metric tons/hr (470 tons/hr) of existing dryer production.

McClaine, A.W.; Breault, R.W.

1998-12-31T23:59:59.000Z

19

ThermOS: system support for dynamic thermal management of chip multi-processors  

Science Conference Proceedings (OSTI)

Constraining the temperature of computing systems has become a dominant aspect in the design of integrated circuits. The supply voltage decrease has lost its pace even though the feature size is shrinking constantly. This results in an increased number ... Keywords: CMP, DTM, OS, chip multi-processor, chip-multiprocessor, dynamic thermal management, multi-core, multicore, operating system

Filippo Sironi, Martina Maggio, Riccardo Cattaneo, Giovanni Francesco Del Nero, Donatella Sciuto, Marco Domenico Santambrogio

2013-10-01T23:59:59.000Z

20

Measuring circuit  

DOE Patents (OSTI)

An automatic gain control circuit functions to adjust the magnitude of an input signal supplied to a measuring circuit to a level within the dynamic range of the measuring circuit while a log-ratio circuit adjusts the magnitude of the output signal from the measuring circuit to the level of the input signal and optimizes the signal-to-noise ratio performance of the measuring circuit.

Sun, Shan C. (Pittsburgh, PA); Chaprnka, Anthony G. (Cockeysville, MD)

1977-01-11T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

A CMOS Current-Mode Dynamic Programming Circuit  

E-Print Network (OSTI)

Dynamic programming (DP) is a fundamental algorithm for complex optimization and decision-making in many engineering and biomedical systems. However, conventional DP computation based on digital implementation of the ...

Mak, Terrence

22

Dynamic and short-circuit power of CMOS gates driving lossless transmission lines  

E-Print Network (OSTI)

Abstract—The dynamic and short-circuit power consumption of a complementary metal–oxide–semidconductor (CMOS) gate driving an inductance–capacitance (LC) transmission line as a limiting case of an RLC transmission line is investigated in this paper. Closed-form solutions for the output voltage and shortcircuit power of a CMOS gate driving an LC transmission line are presented. A closed form solution for the short-circuit power is also presented. These solutions agree with circuit simulations within 11 % error for a wide range of transistor widths and line impedances for a 0.25-"m CMOS technology. The ratio of the short circuit to dynamic power is shown to be less than 7 % for CMOS gates driving LC transmission lines where the line is matched or underdriven. The total power consumption is expected to decrease as inductance effects becomes more significant as compared to a resistance–capacitance (RC)-dominated interconnect line. Index Terms—CMOS, dynamic, interconnect, LC, power dissipation, RC, RLC, short-circuit, transmission lines.

Yehea I. Ismail; Eby G. Friedman; Senior Member; Jose Luis Neves

1999-01-01T23:59:59.000Z

23

Dynamic thermal management in chip multiprocessor systems  

E-Print Network (OSTI)

Recently, processor power density has been increasing at an alarming rate result- ing in high on-chip temperature. Higher temperature increases current leakage and causes poor reliability. In our research, we ¯rst propose a Predictive Dynamic Ther- mal Management (PDTM) based on Application-based Thermal Model (ABTM) and Core-based Thermal Model (CBTM) in the multicore systems. Based on predicted temperature from ABTM and CBTM, the proposed PDTM can maintain the system temperature below a desired level by moving the running application from the possi- ble overheated core to the future coolest core (migration) and reducing the processor resources (priority scheduling) within multicore systems. Furthermore, we present the Thermal Correlative Thermal Management (TCDTM), which incorporates three main components: Statistical Workload Estimation (SWE), Future Temperature Estima- tion Model (FTEM) and Temperature-Aware Thread Controller (TATC), to model the thermal correlation e®ect and distinguish the thermal contributions from appli- cations with di®erent workload behaviors at run time in the CMP systems. The pro- posed PDTM and TCDTM enable the exploration of the tradeo® between throughput and fairness in temperature-constrained multicore systems.

Liu, Chih-Chun

2008-08-01T23:59:59.000Z

24

Dynamic environment coupling induce synchronized states in coupled time-delayed electronic circuits  

E-Print Network (OSTI)

We experimentally demonstrate the occurrence of various synchronized states in coupled piece-wise linear time-delayed electronic circuits using dynamic environment coupling where the environment has its own intrinsic dynamics via feedback from the circuits. We carry out these experiments in two different coupling configurations, namely mutual and subsystem coupling configurations. Depending upon the coupling strength and the nature of feedback, we observe a transition from nonsynchronization to complete synchronization via phase synchronization and from nonsynchronization to inverse synchronization via inverse-phase synchronization between the circuits in hyperchaotic regime. Snapshots of the time evolution, phase projection plots and localized sets of the circuits as observed experimentally from the oscilloscope, along with supporting numerical simulations confirm the existence of different synchronized states. Further, the transition to different synchronized states can be verified from the changes in the largest Lyapunov exponents, Correlation of Probability of Recurrence and Correlation Coefficient as a function of the coupling strength. We present a detailed linear stability analysis and obtain conditions for different synchronized states.

R. Suresh; K. Srinivasan; D. V. Senthilkumar; K. Murali; M. Lakshmanan; J. Kurths

2013-04-04T23:59:59.000Z

25

Creating dynamic equivalent PV circuit models with impedance spectroscopy for arc-fault modeling.  

Science Conference Proceedings (OSTI)

Article 690.11 in the 2011 National Electrical Code{reg_sign} (NEC{reg_sign}) requires new photovoltaic (PV) systems on or penetrating a building to include a listed arc fault protection device. Currently there is little experimental or empirical research into the behavior of the arcing frequencies through PV components despite the potential for modules and other PV components to filter or attenuate arcing signatures that could render the arc detector ineffective. To model AC arcing signal propagation along PV strings, the well-studied DC diode models were found to inadequately capture the behavior of high frequency arcing signals. Instead dynamic equivalent circuit models of PV modules were required to describe the impedance for alternating currents in modules. The nonlinearities present in PV cells resulting from irradiance, temperature, frequency, and bias voltage variations make modeling these systems challenging. Linearized dynamic equivalent circuits were created for multiple PV module manufacturers and module technologies. The equivalent resistances and capacitances for the modules were determined using impedance spectroscopy with no bias voltage and no irradiance. The equivalent circuit model was employed to evaluate modules having irradiance conditions that could not be measured directly with the instrumentation. Although there was a wide range of circuit component values, the complex impedance model does not predict filtering of arc fault frequencies in PV strings for any irradiance level. Experimental results with no irradiance agree with the model and show nearly no attenuation for 1 Hz to 100 kHz input frequencies.

Johnson, Jay Dean; Kuszmaul, Scott S.; Strauch, Jason E.; Schoenwald, David Alan

2011-06-01T23:59:59.000Z

26

The Effect of Circuiting Arrangement on the Thermal Performance of Refrigeration Mixtures in Tube-and-Fin Condensing Heat Exchangers  

SciTech Connect

For the pure or azeotropic refrigerants typically used in present air conditioning and refrigeration applications, the refrigerant changes phase at a constant temperature. Thus, the refrigerant circuiting arrangement such as crossfiow, counterfiow, or cross-counterflow, has no effect on the thermal performance. For zeotropic refrigerant mixtures, however, the phase-change occurs over a temperature range, or "glide", and the refrigerant circuiting arrangement, or flow path through the heat exchanger, can affect the thermal performance of both the heat exchangers as well as the overall efficiency of the vapor compression cooling cycle. The effects of tsvo diflerent circuiting arrangements on the thermal performance of a zeotropic retligerant mixture and an almost azeotropic refrigerant mixture in a four-row cross-countertlow heat exchanger arrangement are reported here. The two condensers differ only in the manner of circuiting the refrigerant tubes, where one has refrigerant always flowing downward in the active heat transfer region ("identical order") and the other has refrigerant alternating flow direction in the active heat transfer region ("inverted order"). All other geometric parameters, such as bce are% fin louver geometry, refrigerant tube size and enhancement etc., are the same for both heat exchangers. One refrigerant mixture (R-41OA) un&rgoes a small temperature change ("low glide") during phase change, and the other retligerant mixture (a multi- component proprietary mixture) has a substantial temperature change ("high glide") of approximately 10"C during the phase change process. The overall thermal conductance, two-phase conductance, and pressure drop are presented. For the flow conditions of these tests, which are representative of resi&ntial cooling conditions, inverted order circuiting is more desirable than identical order. The potential thermal advantages of the i&ntical order arrangement for high-glide zeotropic refrigerant mixtures are negated by the increased parasitic refrigerant-side pressure drop utiortunately resulting from tkbrication requirements of the identical order circuiting.

Chen, D.T.; Conklin, J.C.

1999-03-15T23:59:59.000Z

27

Balance of Power: Dynamic Thermal Management for Internet Data Centers  

Science Conference Proceedings (OSTI)

The advent of Internet-based applications and their resulting multitier distributed architecture has changed the focus of design for large-scale Internet computing. Internet server applications execute in a horizontally scalable topology across hundreds ... Keywords: dynamic thermal management, thermal-load balancing, Internet data center, row-wise and regional thermal management, thermal policies

Ratnesh K. Sharma; Cullen E. Bash; Chandrakant D. Patel; Richard J. Friedrich; Jeffrey S. Chase

2005-01-01T23:59:59.000Z

28

Packaging strategies for printed circuit board components. Volume I, materials & thermal stresses.  

SciTech Connect

Decisions on material selections for electronics packaging can be quite complicated by the need to balance the criteria to withstand severe impacts yet survive deep thermal cycles intact. Many times, material choices are based on historical precedence perhaps ignorant of whether those initial choices were carefully investigated or whether the requirements on the new component match those of previous units. The goal of this program focuses on developing both increased intuition for generic packaging guidelines and computational methodologies for optimizing packaging in specific components. Initial efforts centered on characterization of classes of materials common to packaging strategies and computational analyses of stresses generated during thermal cycling to identify strengths and weaknesses of various material choices. Future studies will analyze the same example problems incorporating the effects of curing stresses as needed and analyzing dynamic loadings to compare trends with the quasi-static conclusions.

Neilsen, Michael K. (Kansas City Plant, Kansas City, MO); Austin, Kevin N.; Adolf, Douglas Brian; Spangler, Scott W.; Neidigk, Matthew Aaron; Chambers, Robert S.

2011-09-01T23:59:59.000Z

29

Thermal storage module for solar dynamic receivers  

DOE Patents (OSTI)

A thermal energy storage system comprising a germanium phase change material and a graphite container.

Beatty, Ronald L. (Farragut, TN); Lauf, Robert J. (Oak Ridge, TN)

1991-01-01T23:59:59.000Z

30

Nonaxisymmetric Thermally Driven Circulations and Upper-Tropospheric Monsoon Dynamics  

Science Conference Proceedings (OSTI)

The authors investigate the nonlinear dynamics of almost inviscid, thermally forced, divergent circulations in situations that are not axisymmetric. In shallow-water numerical calculations, asymmetry is imposed on a locally forced anticyclone by ...

C. Juno Hsu; R. Alan Plumb

2000-05-01T23:59:59.000Z

31

Thermal Fly-height Control Slider Dynamics and Slider-Lubricant Interactions in Hard Disk Drives  

E-Print Network (OSTI)

3 Preliminary Experiments with Thermal Fly-height ControlConclusion . . . . . . . . . . . . . . 4 Thermal Fly-height5 Thermal Fly-height Control Slider Instability and Dynamics

Vangipuram Canchi, Sripathi

2011-01-01T23:59:59.000Z

32

Improved thermal storage module for solar dynamic receivers  

DOE Patents (OSTI)

This invention relates to a thermal storage apparatus and more particularly to an apparatus for use in conjunction with solar dynamic energy storage systems. The invention is comprised of a thermal energy storage system comprising a germanium phase change material and a graphite container.

Beatty, R.L.; Lauf, R.J.

1990-12-31T23:59:59.000Z

33

Improved thermal storage module for solar dynamic receivers  

DOE Patents (OSTI)

This invention relates to a thermal storage apparatus and more particularly to an apparatus for use in conjunction with solar dynamic energy storage systems. The invention is comprised of a thermal energy storage system comprising a germanium phase change material and a graphite container.

Beatty, R.L.; Lauf, R.J.

1990-01-01T23:59:59.000Z

34

Dynamic Thermal Management for High-Performance Storage Systems  

Science Conference Proceedings (OSTI)

Thermal-aware design of disk drives is important because high temperatures can cause reliability problems. Dynamic Thermal Management (DTM) techniques have been proposed to operate the disk at the average case temperature, rather than at the worse case by modulating the activities to avoid thermal emergencies. The thermal emergencies can be caused by unexpected events, such as fan-breaks, increased inlet air temperature, etc. One of the DTM techniques is a delay-based approach that adjusts the disk seek activities, cooling down the disk drives. Even if such a DTM approach could overcome thermal emergencies without stopping disk activity, it suffers from long delays when servicing the requests. Thus, in this chapter, we investigate the possibility of using a multispeed disk-drive (called dynamic rotations per minute (DRPM)) that dynamically modulates the rotational speed of the platter for implementing the DTM technique. Using a detailed performance and thermal simulator of a storage system, we evaluate two possible DTM policies (- time-based and watermark-based) with a DRPM disk-drive and observe that dynamic RPM modulation is effective in avoiding thermal emergencies. However, we find that the time taken to transition between different rotational speeds of the disk is critical for the effectiveness of the DRPM based DTM techniques.

Kim, Youngjae [ORNL; Gurumurthi, Dr Sudhanva [University of Virginia; Sivasubramaniam, Anand [Pennsylvania State University

2012-01-01T23:59:59.000Z

35

Quantum Gibbs distribution from dynamical thermalization in classical nonlinear lattices  

E-Print Network (OSTI)

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

Leonardo Ermann; Dima L. Shepelyansky

2013-07-22T23:59:59.000Z

36

Assessing the reliability of linear dynamic transformer thermal modelling  

E-Print Network (OSTI)

Assessing the reliability of linear dynamic transformer thermal modelling X. Mao, D.J. Tylavsky and G.A. McCulla Abstract: Improving the utilisation of transformers requires that the hot-spot and top. An alternative method for assessing transformer model reliability is provided. 1 Introduction The maximally

37

Condition and Power Transfer Assessment of CenterPoint Energy's Polk-Garrott Pipe-Type Cable Circuit  

Science Conference Proceedings (OSTI)

This report summarizes distributed fiber optic temperature sensing (DFOTS) on pipe-type cable circuits and the results of modifying and implementing EPRI's Dynamic Thermal Circuit Rating (DTCR) system on CenterPoint's Polk-Garrott pipe-type cable circuit in Houston, Texas.

2002-12-12T23:59:59.000Z

38

Residential solar-absorption chiller thermal dynamics  

DOE Green Energy (OSTI)

Research is reported on the transient performance of a commercial residential 3 ton lithium bromide-water absorption chiller designed for solar firing. Emphasis was placed on separating the chiller response from that of the entire test facility so that its transient response could solely be observed and quantified. It was found that the entire system time response and thermal capacitance has a major impact on performance degradation due to transient operation. Tests run to ascertain computer algorithms which simulate system isolated chiller performance, revealed processes hitherto undocumented. Transient operation is simulated by three distinct algorithms associated with the three phases of chiller operation. The first phase is start up time. It was revealed during testing that the time required to reach steady state performance values, when the chiller was turned on, was a linear function of steady state water supply temperatures. The second phase is quasi steady state performance. Test facility's performance compared favorably with the manufacturer's published data. The third phase is the extra capacity produced during spin down. Spin down occurs when the hot water supply pump is turned off while the other system pumps remain operating for a few minutes, thus allowing extra chiller capacity to be realized. The computer algorithms were used to generate plots which show the operational surface of an isolated absorption chiller subjected to off design and transient operation.

Guertin, J.M.; Wood, B.D.; McNeill, B.W.

1981-03-01T23:59:59.000Z

39

Hybrid Dynamic Energy and Thermal Management in Heterogeneous Embedded Multiprocessor SoCs  

E-Print Network (OSTI)

Hybrid Dynamic Energy and Thermal Management in Heterogeneous Embedded Multiprocessor SoCs Shervin propose a joint thermal and energy management technique specifically designed for heterogeneous MPSo technique simultaneously reduces the thermal hot spots, temperature gradients, and energy consumption

Simunic, Tajana

40

Sheath expansion and plasma dynamics in the presence of electrode evaporation: Application to a vacuum circuit breaker  

Science Conference Proceedings (OSTI)

During the postarc dielectric recovery phase in a vacuum circuit breaker, a cathode sheath forms and expels the plasma from the electrode gap. The success or failure of current breaking depends on how efficiently the plasma is expelled from the electrode gap. The sheath expansion in the postarc phase can be compared to sheath expansion in plasma immersion ion implantation except that collisions between charged particles and atoms generated by electrode evaporation may become important in a vacuum circuit breaker. In this paper, we show that electrode evaporation plays a significant role in the dynamics of the sheath expansion in this context not only because charged particle transport is no longer collisionless but also because the neutral flow due to evaporation and temperature gradients may push the plasma toward one of the electrodes. Using a hybrid model of the nonequilibrium postarc plasma and cathode sheath coupled with a direct simulation Monte Carlo method to describe collisions between heavy species, we present a parametric study of the sheath and plasma dynamics and of the time needed for the sheath to expel the plasma from the gap for different values of plasma density and electrode temperatures at the beginning of the postarc phase. This work constitutes a preliminary step toward understanding and quantifying the risk of current breaking failure of a vacuum arc.

Sarrailh, P. [UPS, INPT, LAPLACE (Laboratoire Plasma et Conversion d'Energie), Universite de Toulouse, 118 route de Narbonne, F-31062 Toulouse Cedex 9 (France); LAPLACE, CNRS, F-31062 Toulouse (France); Schneider Electric, Centre de Recherche 38 TEC, 38050 Grenoble Cedex 09 (France); Garrigues, L.; Hagelaar, G. J. M.; Boeuf, J. P. [UPS, INPT, LAPLACE (Laboratoire Plasma et Conversion d'Energie), Universite de Toulouse, 118 route de Narbonne, F-31062 Toulouse Cedex 9 (France); LAPLACE, CNRS, F-31062 Toulouse (France); Sandolache, G.; Rowe, S. [Schneider Electric, Centre de Recherche 38 TEC, 38050 Grenoble Cedex 09 (France)

2009-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Thermal interface conductance in Si/Ge superlattices by equilibrium molecular dynamics  

E-Print Network (OSTI)

We provide a derivation allowing the calculation of thermal conductance at interfaces by equilibrium molecular dynamics simulations and illustrate our approach by studying thermal conduction mechanisms in Si/Ge superlattices. ...

Esfarjani, Keivan

42

Dynamic Model Validation of PV Inverters Under Short-Circuit Conditions: Preprint  

SciTech Connect

Photovoltaic (PV) modules have dramatically decreased in price in the past few years, spurring the expansion of photovoltaic deployment. Residential and commercial rooftop installations are connected to the distribution network; large-scale installation PV power plants (PVPs) have benefited from tax incentives and the low cost of PV modules. As the level penetration of PV generation increases, the impact on power system reliability will also be greater. Utility power system planners must consider the role of PV generation in power systems more realistically by representing PV generation in dynamic stability analyses. Dynamic models of PV inverters have been developed in the positive sequence representation. NREL has developed a PV inverter dynamic model in PSCAD/EMTDC. This paper validates the dynamic model with an actual hardware bench test conducted by Southern California Edison's Distributed Energy Resources laboratory. All the fault combinations -- symmetrical and unsymmetrical -- were performed in the laboratory. We compare the simulation results with the bench test results.

Muljadi, E.; Singh, M.; Bravo, R.; Gevorgian, V.

2013-03-01T23:59:59.000Z

43

Dynamic Model Validation of PV Inverters Under Short-Circuit Conditions: Preprint  

SciTech Connect

Photovoltaic (PV) modules have dramatically decreased in price in the past few years, spurring the expansion of photovoltaic deployment. Residential and commercial rooftop installations are connected to the distribution network; large-scale installation PV power plants (PVPs) have benefited from tax incentives and the low cost of PV modules. As the level penetration of PV generation increases, the impact on power system reliability will also be greater. Utility power system planners must consider the role of PV generation in power systems more realistically by representing PV generation in dynamic stability analyses. Dynamic models of PV inverters have been developed in the positive sequence representation. NREL has developed a PV inverter dynamic model in PSCAD/EMTDC. This paper validates the dynamic model with an actual hardware bench test conducted by Southern California Edison's Distributed Energy Resources laboratory. All the fault combinations -- symmetrical and unsymmetrical -- were performed in the laboratory. We compare the simulation results with the bench test results.

Muljadi, E.; Singh, M.; Bravo, R.; Gevorgian, V.

2013-03-01T23:59:59.000Z

44

Dynamic Model Validation of PV Inverters under Short-Circuit Conditions  

Science Conference Proceedings (OSTI)

Photovoltaic (PV) modules have dramatically decreased in price in the past few years, spurring the expansion of PV deployment. Residential and commercial rooftop installations are connected to the distribution network, large-scale installation PV power ... Keywords: photovoltaic, PV, dynamic model, validation, solar PV inverter, renewables

E. Muljadi, M. Singh, R. Bravo, V. Gevorgian

2013-04-01T23:59:59.000Z

45

Molecular dynamics simulation of thermal energy transport in polydimethylsiloxane (PDMS)  

E-Print Network (OSTI)

Heat transfer across thermal interface materials is a critical issue for microelectronics thermal management. Polydimethylsiloxane (PDMS), one of the most important components of thermal interface materials presents a large ...

Luo, Tengfei

46

Molecular Dynamics of Surface-Moving Thermally Driven Alexei V. Akimov,,  

E-Print Network (OSTI)

Molecular Dynamics of Surface-Moving Thermally Driven Nanocars Alexei V. Akimov,,§ Alexander V Abstract: We developed molecular models describing the thermally initiated motion of nanocars, nanosized-grained-type molecular dynamics simulations were carried out for the species "Trimer" and "Nanotruck", the simplified

47

Statistics of voltage drop in radial distribution circuits: a dynamic programming approach  

E-Print Network (OSTI)

We analyze a power distribution line with high penetration of distributed generation and strong variations of power consumption and generation levels. In the presence of uncertainty the statistical description of the system is required to assess the risks of power outages. In order to find the probability of exceeding the constraints for voltage levels we introduce the probability distribution of maximal voltage drop and propose an algorithm for finding this distribution. The algorithm is based on the assumption of random but statistically independent distribution of loads on buses. Linear complexity in the number of buses is achieved through the dynamic programming technique. We illustrate the performance of the algorithm by analyzing a simple 4-bus system with high variations of load levels.

Turitsyn, Konstantin S

2010-01-01T23:59:59.000Z

48

Abstract--Eventually, prediction of transformer thermal performance for dynamic loading will be made using models  

E-Print Network (OSTI)

1 Abstract--Eventually, prediction of transformer thermal performance for dynamic loading will be made using models distilled from measure data, rather than models derived from transformer heat for measuring the acceptability of transformer thermal models. For a model to be acceptable, it must have

49

A Scalable Modeling Technique to Estimate Dynamic Thermal Design Power of Datapath Intensive Designs  

Science Conference Proceedings (OSTI)

In this paper, a power modeling approach for the estimation of dynamic power under Thermal Design Power (TDP1) for datapath intensive designs is proposed. Early estimation of TDP is crucial for the design of thermal and cooling solutions of a chip and ...

Prashant Agrawal; Srinivasa R. STG; Ajit N. Oke; Saurabh Vijay

2007-03-01T23:59:59.000Z

50

ADDER CIRCUIT  

DOE Patents (OSTI)

An improved parallel addition unit is described which is especially adapted for use in electronic digital computers and characterized by propagation of the carry signal through each of a plurality of denominationally ordered stages within a minimum time interval. In its broadest aspects, the invention incorporates a fast multistage parallel digital adder including a plurality of adder circuits, carry-propagation circuit means in all but the most significant digit stage, means for conditioning each carry-propagation circuit during the time period in which information is placed into the adder circuits, and means coupling carry-generation portions of thc adder circuit to the carry propagating means.

Jacobsohn, D.H.; Merrill, L.C.

1959-01-20T23:59:59.000Z

51

TWO-PHASE FLOW STUDIES IN NUCLEAR POWER PLANT PRIMARY CIRCUITS USING THE THREE-DIMENSIONAL THERMAL-HYDRAULIC CODE BAGIRA.  

SciTech Connect

In this paper we present recent results of the application of the thermal-hydraulic code BAGIRA to the analysis of complex two-phase flows in nuclear power plants primary loops. In particular, we performed benchmark numerical simulation of an integral LOCA experiment performed on a test facility modeling the primary circuit of VVER-1000. In addition, we have also analyzed the flow patterns in the VVER-1000 steam generator vessel for stationary and transient operation regimes. For both of these experiments we have compared the numerical results with measured data. Finally, we demonstrate the capabilities of BAGIRA by modeling a hypothetical severe accident for a VVER-1000 type nuclear reactor. The numerical analysis, which modeled all stages of the hypothetical severe accident up to the complete ablation of the reactor cavity bottom, shows the importance of multi-dimensional flow effects.

KOHURT, P. (BNL), KALINICHENKO, S.D.; KROSHILIN, A.E.; KROSHILIN, V.E.; SMIRNOV, A.V.

2006-06-04T23:59:59.000Z

52

Two-Phase Flow Studies in Nuclear Power Plant Primary Circuits Using the Three-Dimensional Thermal-Hydraulic Code BAGIRA  

Science Conference Proceedings (OSTI)

in this paper we present recent results of the application of the thermal-hydraulic code BAGIRA to the analysis of complex two-phase flows in nuclear power plants primary loops. In particular, we performed benchmark numerical simulation of an integral LOCA experiment performed on a test facility modeling the primary circuit of VVER-1000. In addition, we have also analyzed the flow patterns in the VVER-1000 steam generator vessel for stationary and transient operation regimes. For both of these experiments we have compared the numerical results with measured data. Finally, we demonstrate the capabilities of BAGIRA by modeling a hypothetical severe accident for a VVER-1000 type nuclear reactor. The numerical analysis, which modeled all stages of the hypothetical severe accident up to the complete ablation of the reactor cavity bottom, shows the importance of multi-dimensional flow effects. (authors)

Kalinichenko, S.D.; Kroshilin, A.E.; Kroshilin, V.E.; Smirnov, A.V. [All-Russian Research Institute for Nuclear Power Plant Operations (VNIIAES) 25 Ferganskaya St., 109507 Moscow (Russian Federation); Kohut, P. [Brookhaven National Laboratory, Bldg. 475 Upton, NY 11973, (United States)

2006-07-01T23:59:59.000Z

53

TAPO: Thermal-aware power optimization techniques for servers and data centers  

Science Conference Proceedings (OSTI)

A large portion of the power consumption of data centers can be attributed to cooling. In dynamic thermal management mechanisms for data centers and servers, thermal setpoints are typically chosen statically and conservatively, which leaves significant ... Keywords: power leakage power, TAPO, thermal aware power optimization techniques, data centers, server centers, power consumption, dynamic thermal management mechanisms, thermal setpoints, power budget, heating ventilation and air conditioning, HVAC, circuit leakage power

Wei Huang; M. Allen-Ware; J. B. Carter; E. Elnozahy; H. Hamann; T. Keller; C. Lefurgy; Jian Li; K. Rajamani; J. Rubio

2011-07-01T23:59:59.000Z

54

Multiphase Flow Dynamics 4: Nuclear Thermal Hydraulics, 1st edition  

Science Conference Proceedings (OSTI)

Volume 4 of the successful book package "Multiphase Flow" is devoted to nuclear thermal hydraulics which is a substantial part of nuclear reactor safety. It provides knowledge and mathematical tools for adequate description of the process of transferring ...

Nikolay I. Kolev

2009-06-01T23:59:59.000Z

55

FAST STATIC AND DYNAMIC GRID LEVEL THERMAL SIMULATION CONSIDERING TEMPERATURE DEPENDENT THERMAL CONDUCTIVITY OF SILICON  

E-Print Network (OSTI)

heat diffusion equation has been conventionally handled by grid-grids and an approximate delta function simulating a point heatgrid size of 64×64. To obtain transient thermal mask an impulse heat

Ziabari, Amirkoushyar

2012-01-01T23:59:59.000Z

56

Seismology of the Sun : Inference of Thermal, Dynamic and Magnetic Field Structures of the Interior  

E-Print Network (OSTI)

Recent overwhelming evidences show that the sun strongly influences the Earth's climate and environment. Moreover existence of life on this Earth mainly depends upon the sun's energy. Hence, understanding of physics of the sun, especially the thermal, dynamic and magnetic field structures of its interior, is very important. Recently, from the ground and space based observations, it is discovered that sun oscillates near 5 min periodicity in millions of modes. This discovery heralded a new era in solar physics and a separate branch called helioseismology or seismology of the sun has started. Before the advent of helioseismology, sun's thermal structure of the interior was understood from the evolutionary solution of stellar structure equations that mimicked the present age, mass and radius of the sun. Whereas solution of MHD equations yielded internal dynamics and magnetic field structure of the sun's interior. In this presentation, I review the thermal, dynamic and magnetic field structures of the sun's inter...

Hiremath, K M

2012-01-01T23:59:59.000Z

57

Evaluation of Instrumentation and Dynamic Thermal Ratings for Overhead Lines  

Science Conference Proceedings (OSTI)

In 2010, a project was initiated through a partnership between the Department of Energy (DOE) and the New York Power Authority (NYPA) to evaluate EPRI?s rating technology and instrumentation that can be used to monitor the thermal states of transmission lines and provide the required real-time data for real-time rating calculations. The project included the installation and maintenance of various instruments at three 230 kV line sites in northern New York. The instruments were monitored, and data collection and rating calculations were performed for about a three year period.

Phillips, A.

2013-01-31T23:59:59.000Z

58

Dynamical and thermal descriptions in parton distribution functions  

Science Conference Proceedings (OSTI)

We suggest a duality between the standard (dynamical) and statistical distributions of partons in the nucleons. The temperature parameter entering into the statistical form for the quark distributions is estimated. It is found that this effective temperature is practically the same for the dependence on longitudinal and transverse momenta and, in turn, it is close to the freeze-out temperature in high-energy heavy-ion collisions.

Cleymans, J., E-mail: Jean.Cleymans@uct.ac.za [University of Cape Town, UCT-CERN Research Centre and Department of Physics (South Africa); Lykasov, G. I., E-mail: lykasov@jinr.ru; Sorin, A. S., E-mail: sorin@theor.jinr.ru; Teryaev, O. V., E-mail: teryaev@theor.jinr.ru [JINR (Russian Federation)

2012-06-15T23:59:59.000Z

59

Linear Circuits Designation: Required course  

E-Print Network (OSTI)

circuits. Node and mesh analysis. Operational amplifiers. Signal acquisition and conditioning. Electric, 11k). Objective 4: To acquaint students with the rudiments of electrical-to-mechanical energy) Steady-state and dynamic behavior of linear, lumped-parameter electrical circuits. Kirchoff's laws. RLC

Krstic, Miroslav

60

A Computational Study on the Thermal-Hydraulic Behavior of Supercritical Carbon Dioxide in Various Printed Circuit Heat Exchanger Designs  

E-Print Network (OSTI)

There has been an ever-increasing demand for power generation, which is predicted to grow as society becomes more advanced. However, tradition fossil fuels are beginning to deplete, and there is a great necessity for alternative fuel sources that will bridge the gap between energy production and consumption. To decrease the high demand alternative fuel sources are gaining in popularity. The supercritical carbon dioxide Brayton power cycle has been proposed as a possible cycle for nuclear and concentrated solar power generation. Two main advantages of having supercritical carbon dioxide are the large property variations and component size associated with power cycle. Forced convection heat transfer of supercritical carbon dioxide in printed circuit heat exchanger geometries were investigated in the following study using a finite volume framework and the FLUENT 12.1 code. The geometries of interest were: non- chamfered zig-zag, chamfered zig-zag, and air foil. Flow through the three geometries was in the horizontal orientation and subject to a heating mode operation. A range of testing conditions were explored, including operating pressures between 7.5 to 10.2 MPa with the mass flux ranging from 326 to 762 kg/m2-s. Due to the turbulent nature of this problem, the k?E with enhanced wall treatment and shear stress transport k?? turbulence models were considered. With this addition a total of 54 simulations were performed. Results indicated that there was an increase in the heat transfer coefficient as the supercritical carbon dioxide reached the pseudocritical temperature, conversely as there was an increase in operating pressure, the heat transfer coefficient decreased. Nevertheless, this increase near the pseudocritical temperature was due to a sharp increase in the specific heat. Mass flux effects indicated that there was an increase in heat transfer as the mass flux was increased. This was due to the increase in Reynolds number near the pseudocritical temperature. Next, pressure losses were investigated for the three geometries. The non-chamfered zig-zag channel had the greatest pressure loss associated with it, while the air foil channel had the least. Based on the results, the ratio of the friction factor to heat transfer for the non-chamfered and chamfered zig-zag geometries were approximately 2.65 and 1.57 times higher than for the air foil, thus leading to the idea that the air foil channel may be best suited for practical applications. Finally, the simulation results were compared to experimental data and existing correlations. Many existing correlations failed to accurately predict the magnitude of heat transfer, although they exhibited a similar trend. A new correlation was developed for the zig-zag geometries based on the numerical data obtained during this investigation and published experimental data. The new correlation is able to predict the maximum heat transfer coefficient within 12.4%.

Matsuo, Bryce

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

MULTIPLIER CIRCUIT  

DOE Patents (OSTI)

An electronic circuit is presented for automatically computing the product of two selected variables by multiplying the voltage pulses proportional to the variables. The multiplier circuit has a plurality of parallel resistors of predetermined values connected through separate gate circults between a first input and the output terminal. One voltage pulse is applied to thc flrst input while the second voltage pulse is applied to control circuitry for the respective gate circuits. Thc magnitude of the second voltage pulse selects the resistors upon which the first voltage pulse is imprcssed, whereby the resultant output voltage is proportional to the product of the input voltage pulses

Thomas, R.E.

1959-01-20T23:59:59.000Z

62

GATING CIRCUITS  

DOE Patents (OSTI)

Control circuits for vacuum tubes are described, and a binary counter having an improved trigger circuit is reported. The salient feature of the binary counter is the application of the input signal to the cathode of each of two vacuum tubes through separate capacitors and the connection of each cathode to ground through separate diodes. The control of the binary counter is achieved in this manner without special pulse shaping of the input signal. A further advantage of the circuit is the simplicity and minimum nuruber of components required, making its use particularly desirable in computer machines.

Merrill, L.C.

1958-10-14T23:59:59.000Z

63

Steam Generator Management Program: Thermal-Hydraulic Analysis of a Recirculating Steam Generator Using Commercial Computational Fluid Dynamics Software  

Science Conference Proceedings (OSTI)

The objective of this research was to demonstrate that a commercial computational fluid dynamics code can be set up to model the thermal-hydraulic physics that occur during the operation of a steam generator. Specific complexities in steam-generator thermal-hydraulic modeling include: phase change and two-phase fluid mechanics, hydrodynamic representation of the tube bundle, and thermal coupling between the primary and secondary sides. A commercial computational fluid dynamics code was used without any s...

2012-02-21T23:59:59.000Z

64

MULTIPLIER CIRCUIT  

DOE Patents (OSTI)

An electronic fast multiplier circuit utilizing a transistor controlled voltage divider network is presented. The multiplier includes a stepped potentiometer in which solid state or transistor switches are substituted for mechanical wipers in order to obtain electronic switching that is extremely fast as compared to the usual servo-driven mechanical wipers. While this multiplier circuit operates as an approximation and in steps to obtain a voltage that is the product of two input voltages, any desired degree of accuracy can be obtained with the proper number of increments and adjustment of parameters. (AEC)

Chase, R.L.

1963-05-01T23:59:59.000Z

65

TIMING CIRCUIT  

DOE Patents (OSTI)

An electronic circuit is described for precisely controlling the power delivered to a load from an a-c source, and is particularly useful as a welder timer. The power is delivered in uniform pulses, produced by a thyratron, the number of pulses being controlled by a one-shot multivibrator. The starting pulse is synchronized with the a-c line frequency so that each multivlbrator cycle begins at about the same point in the a-c cycle.

Heyd, J.W.

1959-07-14T23:59:59.000Z

66

Analysis of Permafrost Thermal Dynamics and Response to Climate Change in the CMIP5 Earth System Models  

Science Conference Proceedings (OSTI)

The authors analyze global climate model predictions of soil temperature [from the Coupled Model Intercomparison Project phase 5 (CMIP5) database] to assess the models’ representation of current-climate soil thermal dynamics and their predictions ...

Charles D. Koven; William J. Riley; Alex Stern

2013-03-01T23:59:59.000Z

67

Computational Fluid Dynamics in Support of the SNS Liquid Mercury Thermal-Hydraulic Analysis  

SciTech Connect

Experimental and computational thermal-hydraulic research is underway to support the liquid mercury target design for the Spallation Neutron Source (SNS) facility. The SNS target will be subjected to internal nuclear heat generation that results from pulsed proton beam collisions with the mercury nuclei. Recirculation and stagnation zones within the target are of particular concern because of the likelihood that they will result in local hot spots and diminished heat removal from the target structure. Computational fluid dynamics (CFD) models are being used as a part of this research. Recent improvements to the 3D target model include the addition of the flow adapter which joins the inlet/outlet coolant pipes to the target body and an updated heat load distribution at the new baseline proton beam power level of 2 MW. Two thermal-hydraulic experiments are planned to validate the CFD model.

Siman-Tov, M.; Wendel, M.W.; Yoder, G.L.

1999-11-14T23:59:59.000Z

68

The Analysis of Dynamic Thermal Performance of Insulated Wall and Building Cooling Energy Consumption in Guangzhou  

E-Print Network (OSTI)

The summer in Guangzhou, China, is hot and long. Heat proofing is very important for the energy efficiency of buildings and improvement of the indoor thermal environment. The residential buildings in the southern region are cooled by air conditioning mainly with the increase of the live level. This study investigates the influence of the thermal dynamic performance on the yearly cooling load and yearly maximum cooling demand in typical residential flats by employing KVALUE and DeST. The simulation predictions indicate that reductions in the cooling load and maximum cooling demand are obtained when the insulation is added in the wall, but the potential of energy saving is quite limited when the wall only is insulated.

Zhao, L.; Li, X.; Li, L.; Gao, Y.

2006-01-01T23:59:59.000Z

69

LOGIC CIRCUIT  

DOE Patents (OSTI)

A device for safety rod counting in a nuclear reactor is described. A Wheatstone bridge circuit is adapted to prevent de-energizing the hopper coils of a ball backup system if safety rods, sufficient in total control effect, properly enter the reactor core to effect shut down. A plurality of resistances form one arm of the bridge, each resistance being associated with a particular safety rod and weighted in value according to the control effect of the particular safety rod. Switching means are used to switch each of the resistances in and out of the bridge circuit responsive to the presence of a particular safety rod in its effective position in the reactor core and responsive to the attainment of a predetermined velocity by a particular safety rod enroute to its effective position. The bridge is unbalanced in one direction during normal reactor operation prior to the generation of a scram signal and the switching means and resistances are adapted to unbalance the bridge in the opposite direction if the safety rods produce a predetermined amount of control effect in response to the scram signal. The bridge unbalance reversal is then utilized to prevent the actuation of the ball backup system, or, conversely, a failure of the safety rods to produce the predetermined effect produces no unbalance reversal and the ball backup system is actuated. (AEC)

Strong, G.H.; Faught, M.L.

1963-12-24T23:59:59.000Z

70

Application of Functional Link Neural Network to HVAC Thermal Dynamic System Identification  

E-Print Network (OSTI)

Abstract — Recent efforts to incorporate aspects of artificial intelligence into the design and operation of automatic control systems have focused attention on techniques such as fuzzy logic, artificial neural networks, and expert systems. The use of computers for direct digital control highlights the recent trend toward more effective and efficient heating, ventilating, and airconditioning (HVAC) control methodologies. Researchers in the HVAC field have stressed the importance of self learning in building control systems and have encouraged further studies in the integration of optimal control and other advanced techniques into the formulation of such systems. Artificial neural networks can also be used to emulate the plant dynamics, in order to estimate future plant outputs and obtain plant input/output sensitivity information for on-line neural control adaptation. This paper describes a functional link neural network approach to performing the HVAC thermal dynamic system identification. Methodologies to reduce inputs of the functional link network to reduce the complexity and speed up the training speed will be presented. Analysis and comparison between the functional link network approach and the conventional network approach for the HVAC thermal modeling will also be presented. Index Terms—Functional link, HVAC, intelligent control, neural network, system identification.

Jason Teeter; Mo-yuen Chow; Senior Member

1998-01-01T23:59:59.000Z

71

Law for Thermal Conductivity of Crystalline Nanoporous Silicon Using Molecular Dynamic Simulations  

E-Print Network (OSTI)

G. A. , 2007. “Lattice thermal conductivity of nanoporousPore-size dependence of the thermal conductivity of porousand Chen, G. , 2004. “Thermal conductivity of nanoporous

Fang, Jin; Pilon, Laurent

2011-01-01T23:59:59.000Z

72

Commutation circuit for an HVDC circuit breaker  

DOE Patents (OSTI)

A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the current in an arc after breaker opening to zero to facilitate arc interruption. In a particular embodiment, a normally open commutating circuit is connected across the contacts of a main DC circuit breaker to absorb the inductive system energy trapped by breaker opening and to limit recovery voltages to a level tolerable by the commutating circuit components. 13 figs.

Premerlani, W.J.

1981-11-10T23:59:59.000Z

73

Commutation circuit for an HVDC circuit breaker  

DOE Patents (OSTI)

A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is discharged in opposition to the load current to force the current in an arc after breaker opening to zero to facilitate arc interruption. In a particular embodiment, a normally open commutating circuit is connected across the contacts of a main DC circuit breaker to absorb the inductive system energy trapped by breaker opening and to limit recovery voltages to a level tolerable by the commutating circuit components.

Premerlani, William J. (Scotia, NY)

1981-01-01T23:59:59.000Z

74

Steady-State and Transient Thermal Modeling of Oil-Immersed Bushing-type Current Transformers in Power Transformers and Circuit Brea kers  

Science Conference Proceedings (OSTI)

This report documents methods of calculating the thermal rating of bushing-type Current Transformers (CTs). Researchers compared mathematical models to experimental results and evaluated the limits on CT winding temperature experimentally.

2009-02-09T23:59:59.000Z

75

Quasi-Dynamic Rating Pilot Projects: Tool Development  

Science Conference Proceedings (OSTI)

Operators must rate power equipment conservatively to avoid damage during occasional periods of poor weather. When load and equipment temperatures are not calculated or monitored, power equipment must be assumed to be at high temperature at the onset of limited-time ratings. Such assumptions often result in underestimating thermal capacity (thermal rating) of power equipment under most actual operating conditions. EPRI's Dynamic Thermal Circuit Rating (DTCR) technology, which encompasses a number of soft...

2003-12-12T23:59:59.000Z

76

MOLECULAR DYNAMICS STUDY OF THE THERMAL CONDUCTIVITY OF AMORPHOUS NANOPOROUS SILICA  

E-Print Network (OSTI)

Domain size effects in molecular dynamics simulation ofC. H. , 2010. “Size effects in molecular dynamics thermaland nanowires using molecular dynamics simulations”.

Coquil, Thomas; Fang, Jin; Pilon, Laurent

2011-01-01T23:59:59.000Z

77

Triple effect absorption chiller utilizing two refrigeration circuits  

Science Conference Proceedings (OSTI)

This patent describes a heat absorption method for an absorption chiller. It comprises: providing a firs absorption system circuit for operation within a first temperature range, providing a second absorption system circuit for operation within a second temperature range; heat exchanging refrigerant and absorber solution; thermal communication with an external heat load. This patent describes a heat absorption apparatus for use as an absorption chiller. It includes: a first absorption system circuit for operation within a first temperature range; a second absorption system circuit for operation within a second temperature range which has a lower maximum temperature relative to the first temperature range; the first circuit having generator means, condenser means, evaporator means, and absorber means operatively connected together; the second circuit having generator means condenser means, evaporator means, and absorber means operative connected together; and the first circuit condenser means and the first circuit absorber means being in heat exchange communication with the second circuit generator means.

DeVault, R.C.

1988-03-22T23:59:59.000Z

78

DownloadedBy:[GeorgiaTechnologyLibrary]At:16:1730January2007 THERMAL PROPERTIES AND LATTICE DYNAMICS OF  

E-Print Network (OSTI)

of the zeolite MFI by a combination of experimental measurements and lattice dynamical modeling is presented is successfully reproduced by a phonon relaxation time­based model. The results indicate the possibility of developing a predictive model of the thermal properties of complex zeolite materials. KEY WORDS: nanoporous

Nair, Sankar

79

Technique for extending the range of a signal measuring circuit  

DOE Patents (OSTI)

An input signal supplied to a signal measuring circuit is either amplified or attenuated as necessary to establish the magnitude of the input signal within the defined dynamic range of the measuring circuit and the output signal developed by the measuring circuit is subsequently readjusted through amplification or attenuation to develop an output signal which corresponds to the magnitude of the initial input signal.

Chaprnka, Anthony G. (Cockeysville, MD); Sun, Shan C. (Pittsburgh, PA); Vercellotti, Leonard C. (Verona, PA)

1978-01-01T23:59:59.000Z

80

Thermally-aware modeling and performance evaluation for single-walled carbon nanotube-based interconnects for future high performance integrated circuits  

Science Conference Proceedings (OSTI)

Given the performance and reliability limits of conventional copper interconnects in the tens of nanometer regime, carbon-nanotube (CNT) based interconnects emerge as a potential reliable alternative for future high performance VLSI industry. In this ... Keywords: Carbon nanotube bundles, High performance interconnect, Thermal modeling

Amir Hosseini; Vahid Shabro

2010-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

860 IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, VOL. 28, NO. 6, JUNE 2009 Multiscale Thermal Analysis for Nanometer-Scale  

E-Print Network (OSTI)

of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, CO 80309 USA (e-mail: li power densities are making this problem more important. Characterizing the thermal profile of an IC in software and used for the full-chip ther- mal analysis and temperature-dependent leakage analysis of an IC

Dick, Robert

82

A model reduction approach for constructing compact dynamic thermal models of IGBT-modules of inverters  

Science Conference Proceedings (OSTI)

This paper presents a model reduction approach for constructing lumped RC thermal networks of IGBT-modules of inverters for which heat and subsequent temperature increases vary with time on different scales ranging from nanosecond to second. It was observed ... Keywords: Compact thermal modelling, Electro-thermal simulation, IGBT-modules, Inverters, Thermal analysis

J. Antonios; N. Ginot; C. Batard; Y. Scudeller; M. Machmoum

2012-06-01T23:59:59.000Z

83

Thermal Comfort under Transient Metabolic and Dynamic Localized Airflow Conditions Combined with Neutral and Warm Ambient Temperatures  

E-Print Network (OSTI)

Human thermal environments constitute complex combinations of various interacting thermal factors. The transient and non-uniform nature of those thermal factors further increases the complexity of the thermal comfort problem. The conventional approach to the thermal comfort problem has been simplifying the problem and providing steady thermal environments which would satisfy the majority of the people in a given space. However, several problems emerged with this approach. People became finely tuned to the narrow range of conditions and developed expectations for the same conditions which made them uncomfortable when there were slight deviations from those conditions. Also, the steady approach didn't solve the comfort problem because, in practice, people move between spaces, and thermal conditions such as metabolic rate, surface temperatures, airflow speed and direction vary in a typical day. A human subject test was designed to determine the transient relationship between the people and their environments. In the first part, thermal perceptions of people were taken during various metabolic rate conditions. In the second and the third parts, transient conditions of different thermal factors were created. Various combinations of airflow frequencies, airflow location around the body, metabolic rate, and room temperatures were tested for their individual and interaction effects of providing thermal comfort. The concept of Localized Dynamic Airflow was proposed in which room airflow was simply redirected to different parts of the body with a varying airflow speed. Results showed that males and females respond differently to the thermal conditions. The room temperatures they found neutral were significantly different. People?s thermal comfort during transient metabolic conditions was similar to high metabolic conditions. This heightened response extended into the next ten minutes after the high metabolic conditions ended. Test results suggested that people tolerate higher temperatures during transient environmental conditions. The average response was for comfortable even during the high temperature (83°F) and high metabolic rate (4 met) conditions. Low energy use of the localized dynamic airflow and the increased room temperatures has significant potential for monetary savings.

Ugursal, Ahmet

2010-12-01T23:59:59.000Z

84

Light beam dynamics in materials with radially-inhomogeneous thermal conductivity  

E-Print Network (OSTI)

We study the properties of bright and vortex solitons in thermal media with nonuniform thermal conductivity and homogeneous refractive index, whereby the local modulation of the thermal conductivity strongly affects the entire refractive index distribution. While regions where the thermal conductivity is increased effectively expel light, self-trapping may occur in the regions with reduced thermal conductivity, even if such regions are located close to the material boundary. As a result, strongly asymmetric self-trapped beams may form inside a ring with reduced thermal conductivity and perform persistent rotary motion. Also, such rings are shown to support stable vortex solitons, which may feature strongly non-canonical shapes.

Kartashov, Yaroslav V; Torner, Lluis

2013-01-01T23:59:59.000Z

85

LABORATORY V ELECTRIC CIRCUITS  

E-Print Network (OSTI)

are inside materials such as wires or light bulbs. Even though the interactions of electrons inside materials your track lighting uses. So, you decide to build a model of circuits using two bulbs and compare bulbs are as bright as your reference circuit is equivalent to the circuit that your track lighting uses

Minnesota, University of

86

Piezoelectric drive circuit  

DOE Patents (OSTI)

A piezoelectric motor drive circuit is provided which utilizes the piezoelectric elements as oscillators and a Meacham half-bridge approach to develop feedback from the motor ground circuit to produce a signal to drive amplifiers to power the motor. The circuit automatically compensates for shifts in harmonic frequency of the piezoelectric elements due to pressure and temperature changes.

Treu, Jr., Charles A. (Raymore, MO)

1999-08-31T23:59:59.000Z

87

Piezoelectric drive circuit  

DOE Patents (OSTI)

A piezoelectric motor drive circuit is provided which utilizes the piezoelectric elements as oscillators and a Meacham half-bridge approach to develop feedback from the motor ground circuit to produce a signal to drive amplifiers to power the motor. The circuit automatically compensates for shifts in harmonic frequency of the piezoelectric elements due to pressure and temperature changes. 7 figs.

Treu, C.A. Jr.

1999-08-31T23:59:59.000Z

88

DYNAMIC THERMALLY-DISCONNECTED BUILDING ENVELOPES A NEW PARADIGM FOR WALLS AND ROOFS IN LOW ENERGY BUILDINGS  

Science Conference Proceedings (OSTI)

This paper describes numerical and experimental analysis of a novel design concept. Traditionally the thermal design of building envelope assemblies is based on a static energy flow. However, building envelopes are subject to varying environmental conditions. This mismatch between the steady-state principles used in the design of roofs and walls and their dynamic operation results in relatively low thermal efficiency. Design work in support of the development of zero energy houses showed that conventional insulations may not be the most cost effective energy solution. Testing conducted on several strategies to thermally-disconnect wall and roof components showed 70% to 90% reductions in peak hour loads as compared to conventional building practice.

Miller, William A [ORNL; Kosny, Jan [ORNL; Zaltash, Abdolreza [ORNL

2010-01-01T23:59:59.000Z

89

CIRCUITS FOR CURRENT MEASUREMENTS  

DOE Patents (OSTI)

Circuits are presented for measurement of a logarithmic scale of current flowing in a high impedance. In one form of the invention the disclosed circuit is in combination with an ionization chamber to measure lonization current. The particular circuit arrangement lncludes a vacuum tube having at least one grid, an ionization chamber connected in series with a high voltage source and the grid of the vacuum tube, and a d-c amplifier feedback circuit. As the ionization chamber current passes between the grid and cathode of the tube, the feedback circuit acts to stabilize the anode current, and the feedback voltage is a measure of the logaritbm of the ionization current.

Cox, R.J.

1958-11-01T23:59:59.000Z

90

A LUMPED-PARAMETER DYNAMIC MODEL OF A THERMAL REGENERATOR FOR FREE-PISTON STIRLING ENGINES  

E-Print Network (OSTI)

Design of a 2.5kW Low Temperature Stirling Engine for Distributed Solar Thermal Generation Mike He on the design of a Stirling engine for distributed solar thermal ap- plications. In particular, we design for experimentation. Stirling engines can have broad significance and technological advantages for distributed

Barth, Eric J.

91

Virtual Circuits (OSCARS)  

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

Virtual Circuits (OSCARS) Virtual Circuits (OSCARS) Services Overview ECS Audio/Video Conferencing Fasterdata IPv6 Network Network Performance Tools (perfSONAR) ESnet OID Registry PGP Key Service Virtual Circuits (OSCARS) OSCARS Case Study Documentation Links Hardware Requirements DOE Grids Service Transition Contact Us Technical Assistance: 1 800-33-ESnet (Inside the US) 1 800-333-7638 (Inside the US) 1 510-486-7600 (Globally) 1 510-486-7607 (Globally) Report Network Problems: trouble@es.net Provide Web Site Feedback: info@es.net Virtual Circuits (OSCARS) ESnet's On-Demand Secure Circuits and Advance Reservation System (OSCARS) provides multi-domain, high-bandwidth virtual circuits that guarantee end-to-end network data transfer performance. Originally a research concept, OSCARS has grown into a robust production service. Currently

92

Remote reset circuit  

SciTech Connect

A remote reset circuit acts as a stand-alone monitor and controller by clocking in each character sent by a terminal to a computer and comparing it to a given reference character. When a match occurs, the remote reset circuit activates the system's hardware reset line. The remote reset circuit is hardware based centered around monostable multivibrators and is unaffected by system crashes, partial serial transmissions, or power supply transients.

Gritzo, Russell E. (West Melbourne, FL)

1987-01-01T23:59:59.000Z

93

Remote reset circuit  

DOE Patents (OSTI)

A remote reset circuit acts as a stand-along monitor and controller by clocking in each character sent by a terminal to a computer and comparing it to a given reference character. When a match occurs, the remote reset circuit activates the system's hardware reset line. The remote reset circuit is hardware based centered around monostable multivibrators and is unaffected by system crashes, partial serial transmissions, or power supply transients. 4 figs.

Gritzo, R.E.

1985-09-12T23:59:59.000Z

94

Gas pressure reduction circuits  

Science Conference Proceedings (OSTI)

This note describes passive pressure reduction devices for use with sensitive instruments. Two gas circuits are developed which not only provide a pressure reduction under flow demand

D. W. Guillaume; D. DeVries

1989-01-01T23:59:59.000Z

95

The evolution of solid density within a thermal explosion II. Dynamic proton radiography of cracking and solid consumption by burning  

Science Conference Proceedings (OSTI)

We report proton transmission images obtained subsequent to the laser assisted thermal ignition of a sample of PBX 9501 (a plastic bonded formulation of the explosive nitramine octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX)). We describe the laser assisted thermal ignition technique as a means to synchronize a non-linear thermal ignition event while preserving the subsequent post-ignition behavior. We have obtained dynamic proton transmission images at two spatial magnifications and viewed both the radial and transverse axis of a solid cylindrical sample encased in aluminum. Images have been obtained with 3 to 15 {mu}s temporal resolution and approximately 100 {mu}m spatial resolution at the higher magnification. We observe case expansion from very early in the experiment, until case fragmentation. We observe spatially anisotropic features in the transmission which we attribute to cracking in the solid explosive, in agreement with previous measurements conducted on two dimensional samples with optical viewing. Digital analysis of the images also reveals spatially isotropic features which we attribute to the evolution of the loss of density by burning subsequent to thermal ignition.

Smilowitz, L.; Henson, B. F.; Romero, J. J.; Asay, B. W.; Saunders, A.; Merrill, F. E.; Morris, C. L.; Kwiatkowski, K.; Grim, G.; Mariam, F.; Schwartz, C. L.; Hogan, G.; Nedrow, P.; Murray, M. M.; Thompson, T. N.; Espinoza, C.; Lewis, D.; Bainbridge, J.; McNeil, W.; Rightley, P. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); and others

2012-05-15T23:59:59.000Z

96

Dynamical behavior of the entanglement, purity and energy between atomic qubits in motion under the influence of thermal environment  

E-Print Network (OSTI)

The entanglement, purity and energy of two isolated two-level atoms which are initially prepared in Bell state and each interacts with a thermal cavity field are investigated by considering the atomic motion and the field-mode structure. We achieve the analytical solutions of the atomic qubits by using the algebraic dynamical approach and the influences of the field-mode structure parameter, the strength of the thermal field and the detuning on the entanglement, purity and energy are discussed. We also investigate the state evolution of the atomic qubits based on the entanglement-purity-energy diagrams. Our results show that the disentanglement process of the atomic qubits accompanies by excitations transferring from atomic subsystem to cavity field modes and atomic state from a pure state convert to the mixed states.

L. Tan; Y. Q. Zhang; Z. H. Zhu; L. W. Liu

2010-05-20T23:59:59.000Z

97

Dynamical Interpretation of Satellite-Sensed Thermal Features off Vancouver Island  

Science Conference Proceedings (OSTI)

Two series of very high resolution thermal infrared satellite images, off Vancouver Island, are examined for evidence of baroclinic waves. A 1979 winter sequence of three images exhibits cold tongues, extending seaward from Vancouver Island, ...

William J. Emery; Lawrence A. Mysak

1980-06-01T23:59:59.000Z

98

LABORATORY IV ELECTRIC CIRCUITS  

E-Print Network (OSTI)

familiar electric curren ts are inside materials such as wires or light bulbs. Even though the interactions your track lighting uses. You decide to build models of circuits with two bulbs connected across, bulbs, and batteries. Use the accompanying legend to build the circuits. Legend: light bulb ba

Minnesota, University of

99

Compensated gain control circuit for buck regulator command charge circuit  

DOE Patents (OSTI)

A buck regulator command charge circuit includes a compensated-gain control signal for compensating for changes in the component values in order to achieve optimal voltage regulation. The compensated-gain control circuit includes an automatic-gain control circuit for generating a variable-gain control signal. The automatic-gain control circuit is formed of a precision rectifier circuit, a filter network, an error amplifier, and an integrator circuit.

Barrett, David M. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

100

IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, VOL. , NO. , 2012 1 Dynamic Driver Supply Voltage Scaling for Organic  

E-Print Network (OSTI)

Dynamic Driver Supply Voltage Scaling for Organic Light Emitting Diode Displays Donghwa Shin, Student, Fellow, IEEE Abstract--Organic light emitting diode (OLED) display is a self-illuminating device]. On the other hand, an organic light emitting diode (OLED) is self-illuminating using organic light emission

Pedram, Massoud

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Apparatus for mounting a diode in a microwave circuit  

DOE Patents (OSTI)

Apparatus for mounting a diode in a microwave circuit for making electrical contact between the circuit and ground and for dissipation of heat between the diode and a heat sink. The diode, supported on a thermally and electrically conductive member, is resiliently pressed in electrical contact with the microwave circuit. A tapered collar on the member is elastically deformably wedged into a tapered aperture formed in a heat sink. The wedged collar tightens firmly around the member establishing good thermal and electrical conduction from the diode to the heat sink and ground. Disassembly is facilitated because of the elastically deformed collar.

Liu, Shing-gong (Princeton, NJ)

1976-07-27T23:59:59.000Z

102

Influence Of Three Dynamic Predictive Clothing Insulation Models On Building Energy Use, HVAC Sizing And Thermal Comfort  

E-Print Network (OSTI)

Weather, Clothing and Thermal Adaptation to Indoor Climate,of Determining Acceptable Thermal Conditions, Building andan Adaptive Model of Thermal Comfort and Preference, Final

Schiavon, Stefano; Lee, Kwang Ho

2013-01-01T23:59:59.000Z

103

Sensor readout detector circuit  

DOE Patents (OSTI)

A sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level. The circuit operates at a very low standby power level and is triggerable by a sensor event signal that is above a predetermined threshold level. A plurality of sensor readout detector circuits can be formed on a substrate as an integrated circuit (IC). These circuits can operate to process data from an array of sensors in parallel, with only data from active sensors being processed for digitization and analysis. This allows the IC to operate at a low power level with a high data throughput for the active sensors. The circuit may be used with many different types of sensors, including photodetectors, capacitance sensors, chemically-sensitive sensors or combinations thereof to provide a capability for recording transient events or for recording data for a predetermined period of time following an event trigger. The sensor readout detector circuit has applications for portable or satellite-based sensor systems. 6 figs.

Chu, D.D.; Thelen, D.C. Jr.

1998-08-11T23:59:59.000Z

104

Sensor readout detector circuit  

DOE Patents (OSTI)

A sensor readout detector circuit is disclosed that is capable of detecting sensor signals down to a few nanoamperes or less in a high (microampere) background noise level. The circuit operates at a very low standby power level and is triggerable by a sensor event signal that is above a predetermined threshold level. A plurality of sensor readout detector circuits can be formed on a substrate as an integrated circuit (IC). These circuits can operate to process data from an array of sensors in parallel, with only data from active sensors being processed for digitization and analysis. This allows the IC to operate at a low power level with a high data throughput for the active sensors. The circuit may be used with many different types of sensors, including photodetectors, capacitance sensors, chemically-sensitive sensors or combinations thereof to provide a capability for recording transient events or for recording data for a predetermined period of time following an event trigger. The sensor readout detector circuit has applications for portable or satellite-based sensor systems.

Chu, Dahlon D. (Albuquerque, NM); Thelen, Jr., Donald C. (Bozeman, MT)

1998-01-01T23:59:59.000Z

105

Combustion Characteristics of Coal and Biomass Blends and Thermal Dynamic Analysis  

Science Conference Proceedings (OSTI)

By using TGA technology, the combustion characteristics under different conditions of hard coal and biomass blends has been discussed. The combustion curves of blends exhibited the characteristics with two peaks. Results also exhibited that there was ... Keywords: coal, biomass, thermal analysis, combustion characteristics

Haizhen Huang; Haibo Chen; Guohua Wang; Jun Liu

2009-10-01T23:59:59.000Z

106

DIFFERENTIAL FAULT SENSING CIRCUIT  

DOE Patents (OSTI)

A differential fault sensing circuit is designed for detecting arcing in high-voltage vacuum tubes arranged in parallel. A circuit is provided which senses differences in voltages appearing between corresponding elements likely to fault. Sensitivity of the circuit is adjusted to some level above which arcing will cause detectable differences in voltage. For particular corresponding elements, a group of pulse transformers are connected in parallel with diodes connected across the secondaries thereof so that only voltage excursions are transmitted to a thyratron which is biased to the sensitivity level mentioned.

Roberts, J.H.

1961-09-01T23:59:59.000Z

107

On using virtual circuits for GridFTP transfers  

Science Conference Proceedings (OSTI)

The goal of this work is to characterize scientific data transfers and to determine the suitability of dynamic virtual circuit service for these transfers instead of the currently used IP-routed service. Specifically, logs collected by servers executing ...

Z. Liu, M. Veeraraghavan, Z. Yan, C. Tracy, J. Tie, I. Foster, J. Dennis, J. Hick, Y. Li, W. Yang

2012-11-01T23:59:59.000Z

108

Bioluminescent Bioreporter Integrated Circuits  

To address the need for fieldable real-time biological recognition systems, ORNL researchers developed a "laboratory on a chip" using genetically engineered whole cell biosensors attached to integrated circuits (ICs). These bioluminescent ...

109

Dynamics of the ion-ion acoustic instability in the thermalization of ion beams  

SciTech Connect

Particle simulation using a nonlinear adiabatic electron response with two streaming ion species and nonlinear theory are used to study the collisionless thermalization of ion beams in a hot electron plasma. The slow beam or subsonic regime is investigated and the criterion for the transition from predominantly light ion to predominantly heavy ion heating is developed. Long-lived ion hole structures a-re observed in the final state.

Han, J.H.; Horton, W. (Texas Univ., Austin, TX (United States). Inst. for Fusion Studies); Leboeuf, J.N. (Oak Ridge National Lab., TN (United States))

1992-07-01T23:59:59.000Z

110

Thermal analysis of heat storage canisters for a solar dynamic, space power system  

DOE Green Energy (OSTI)

A thermal analysis was performed of a thermal energy storage canister of a type suggested for use in a solar receiver for an orbiting Brayton cycle power system. Energy storage for the eclipse portion of the cycle is provided by the latent heat of a eutectic mixture of LiF and CaF/sub 2/ contained in the canister. The chief motivation for the study is the prediction of vapor void effects on temperature profiles and the identification of possible differences between ground test data and projected behavior in microgravity. The first phase of this study is based on a two-dimensional, cylindrical coordinates model using an interim procedure for describing void behavior in 1/minus/g and microgravity. The thermal anaylsis includes the effects of solidification front behavior, conduction in liquid/solid salt and canister materials, void growth and shrinkage, radiant heat transfer across the void, and convection in the melt due to Marangoni-induced flow and, in 1/minus/g, flow due to density gradients. A number of significant differences between 1/minus/g and 0/minus/g behavior were found. These resulted from differences in void location relative to the maximum heat flux and a significantly smaller effective conductance in 0/minus/g due to the absence of gravity-induced convection.

Wichner, R.P.; Solomon, A.D.; Drake, J.B.; Williams, P.T.

1988-04-01T23:59:59.000Z

111

Post-silicon power mapping techniques for integrated circuits  

Science Conference Proceedings (OSTI)

We propose a new methodology for post-silicon power validation using the captured thermal infrared emissions from the back-side of operational integrated circuits. We first identify the challenges associated with thermal to power inversion, and then ... Keywords: Infrared imaging, Post-silicon validation, Power analysis, Power mapping

Sherief Reda; Abdullah N. Nowroz; Ryan Cochran; Stefan Angelevski

2013-01-01T23:59:59.000Z

112

Circuit simulation: some humbling thoughts  

Science Conference Proceedings (OSTI)

A short, very personal note on circuit simulation is presented. It does neither include theoretical background on circuit simulation, nor offers an overview of available software, but just gives some general remarks for a discussion on circuit simulator needs in context to the design and development of accelerator beam instrumentation circuits and systems.

Wendt, Manfred; /Fermilab

2006-01-01T23:59:59.000Z

113

Quantum Circuit Model Topological Model  

E-Print Network (OSTI)

Quantum Circuit Model Topological Model Comparison of Models Topological Quantum Computation Eric Rowell Texas A&M University October 2010 Eric Rowell Topological Quantum Computation #12;Quantum Circuit Model Topological Model Comparison of Models Outline 1 Quantum Circuit Model Gates, Circuits

Rowell, Eric C.

114

Superconducting flux flow digital circuits  

DOE Patents (OSTI)

A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs) are disclosed. Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics. 8 figs.

Hietala, V.M.; Martens, J.S.; Zipperian, T.E.

1995-02-14T23:59:59.000Z

115

Superconducting flux flow digital circuits  

DOE Patents (OSTI)

A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs). Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics.

Hietala, Vincent M. (Placitas, NM); Martens, Jon S. (Sunnyvale, CA); Zipperian, Thomas E. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

116

Dynamic thermal testing of lead-acid batteries for the PREPA battery energy storage system  

DOE Green Energy (OSTI)

A test is being carried out to determine the thermal load that will be present in a 20 MW battery energy storage system (BESS) facility being built by the Puerto Rico Electric Power Authority (PREPA). Efforts were made to duplicate, on a smaller scale, the arrangement of the flooded lead-acid cells in the BESS and to generate ambient temperatures typical of Puerto Rico through use of an environmental chamber. A utility energy storage (UES) test cycle for the 12-cell series string was set up based on projected operating parameters scaled from the BESS for frequency regulation and spinning reserve operating modes. Battery temperatures were measured during UES cycling and fit to a thermal model for the system. Cell temperatures increased slowly over a week-long utility cycle and eventually were elevated by 13{degrees}C (23{degrees}F) in the most extreme case observed to date. Temperature increases are expected to be lower in the BESS facility due to a much higher air flow rate than in the test chamber.

Jungst, R.G.; Freese, J.M.; Rodriguez, G.P.; Dykhuizen, R.C.; Braithwaite, J.W.; Woods, C.

1993-08-01T23:59:59.000Z

117

Single particle machine for generalized thermalization  

E-Print Network (OSTI)

The long time accumulation of the actions of single particle "reservoir" can transfer some information of its initial state to its coupled system. This dynamic process can be referred as a generalized thermalization since the coupled system can reach the same temperature as that of the reservoir in a thermal equilibrium. The system can be cooled and "coherently heated" as a maser process, respectively, when the reservoir is initially prepared in ground and excited states. Especially, when the "reservoir" in equilibrium is driven to possesses some coherence, the thermalized system may reach higher temperature in comparison with the reservoir. We also point out a possible experimental test for our theoretical prediction based on superconducting circuit QED.

Liao, Jie-Qiao; Sun, C P

2009-01-01T23:59:59.000Z

118

The Dynamics of Rayleigh-Taylor Stable and Unstable Contact Discontinuities with Anisotropic Thermal Conduction  

E-Print Network (OSTI)

We study the effects of anisotropic thermal conduction along magnetic field lines on an accelerated contact discontinuity in a weakly collisional plasma. We first perform a linear stability analysis similar to that used to derive the Rayleigh-Taylor instability (RTI) dispersion relation. We find that anisotropic conduction is only important for compressible modes, as incompressible modes are isothermal. Modes grow faster in the presence of anisotropic conduction, but growth rates do not change by more than a factor of order unity. We next run fully non-linear numerical simulations of a contact discontinuity with anisotropic conduction. The non-linear evolution can be thought of as a superposition of three physical effects: temperature diffusion due to vertical conduction, the RTI, and the heat flux driven buoyancy instability (HBI). In simulations with RTI-stable contact discontinuities, the temperature discontinuity spreads due to vertical heat conduction. This occurs even for initially horizontal magnetic f...

Lecoanet, Daniel; Quataert, Eliot

2012-01-01T23:59:59.000Z

119

Cost-Energy Dynamics of Thermal Insulation: Potential Energy Savings and Policy Recommendations  

E-Print Network (OSTI)

This paper looks at extra insulation for saving energy from the viewpoint of a decision maker. Public and private decisions are distinguished. Profitability and process analyses are combined to obtain a simple trade-off relationship between the extra cost and extra energy saving. Due to higher costs of energy at present and in the foreseeable future, good opportunities exist to retrofit existing thermal envelopes with extra insulation. Potential costs and savings in the residential, commercial and manufacturing sectors are assessed. A hypothetical $10 billion insulation budget is determined to save 0.5 quad/yr of energy for the next 10 to 15 years, resulting in conservation energy costing less than $2/MMBtu. It is argued that public subsidies to energy conservation and energy supply technologies should be weighed so that the worth of each unit of resultant energy at the point of use is the same.

Phung, D. L.; Plaza, H.

1980-01-01T23:59:59.000Z

120

ELECTRONIC TRIGGER CIRCUIT  

DOE Patents (OSTI)

An electronic trigger circuit is described of the type where an output pulse is obtained only after an input voltage has cqualed or exceeded a selected reference voltage. In general, the invention comprises a source of direct current reference voltage in series with an impedance and a diode rectifying element. An input pulse of preselected amplitude causes the diode to conduct and develop a signal across the impedance. The signal is delivered to an amplifier where an output pulse is produced and part of the output is fed back in a positive manner to the diode so that the amplifier produces a steep wave front trigger pulsc at the output. The trigger point of the described circuit is not subject to variation due to the aging, etc., of multi-electrode tabes, since the diode circuit essentially determines the trigger point.

Russell, J.A.G.

1958-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

ELECTRONIC MULTIPLIER CIRCUIT  

DOE Patents (OSTI)

An electronic multiplier circuit is described in which an output voltage having an amplitude proportional to the product or quotient of the input signals is accomplished in a novel manner which facilitates simplicity of circuit construction and a high degree of accuracy in accomplishing the multiplying and dividing function. The circuit broadly comprises a multiplier tube in which the plate current is proportional to the voltage applied to a first control grid multiplied by the difference between voltage applied to a second control grid and the voltage applied to the first control grid. Means are provided to apply a first signal to be multiplied to the first control grid together with means for applying the sum of the first signal to be multiplied and a second signal to be multiplied to the second control grid whereby the plate current of the multiplier tube is proportional to the product of the first and second signals to be multiplied.

Thomas, R.E.

1959-08-25T23:59:59.000Z

122

Electrical Circuit Tester  

DOE Patents (OSTI)

An electrical circuit testing device is provided, comprising a case, a digital voltage level testing circuit with a display means, a switch to initiate measurement using the device, a non-shorting switching means for selecting pre-determined electrical wiring configurations to be tested in an outlet, a terminal block, a five-pole electrical plug mounted on the case surface and a set of adapters that can be used for various multiple-pronged electrical outlet configurations for voltages from 100 600 VAC from 50 100 Hz.

Love, Frank (Amarillo, TX)

2006-04-18T23:59:59.000Z

123

Small circuits for cryptography.  

SciTech Connect

This report examines a number of hardware circuit design issues associated with implementing certain functions in FPGA and ASIC technologies. Here we show circuit designs for AES and SHA-1 that have an extremely small hardware footprint, yet show reasonably good performance characteristics as compared to the state of the art designs found in the literature. Our AES performance numbers are fueled by an optimized composite field S-box design for the Stratix chipset. Our SHA-1 designs use register packing and feedback functionalities of the Stratix LE, which reduce the logic element usage by as much as 72% as compared to other SHA-1 designs.

Torgerson, Mark Dolan; Draelos, Timothy John; Schroeppel, Richard Crabtree; Miller, Russell D.; Anderson, William Erik

2005-10-01T23:59:59.000Z

124

Bioluminescent bioreporter integrated circuit  

DOE Patents (OSTI)

Disclosed are monolithic bioelectronic devices comprising a bioreporter and an OASIC. These bioluminescent bioreporter integrated circuit are useful in detecting substances such as pollutants, explosives, and heavy-metals residing in inhospitable areas such as groundwater, industrial process vessels, and battlefields. Also disclosed are methods and apparatus for environmental pollutant detection, oil exploration, drug discovery, industrial process control, and hazardous chemical monitoring.

Simpson, Michael L. (Knoxville, TN); Sayler, Gary S. (Blaine, TN); Paulus, Michael J. (Knoxville, TN)

2000-01-01T23:59:59.000Z

125

Circuit breaker lockout device  

DOE Patents (OSTI)

An improved lockout assembly for locking a circuit breaker in a selected off or on position is provided. The lockout assembly includes a lock block and a lock pin. The lock block has a hollow interior which fits over the free end of a switch handle of the circuit breaker. The lock block includes at least one hole that is placed in registration with a hole in the free end of the switch handle. A lock tab on the lock block serves to align and register the respective holes on the lock block and switch handle. A lock pin is inserted through the registered holes and serves to connect the lock block to the switch handle. Once the lock block and the switch handle are connected, the position of the switch handle is prevented from being changed by the lock tab bumping up against a stationary housing portion of the circuit breaker. When the lock pin installed, an apertured-end portion of the lock pin is in registration with another hole on the lock block. Then a special scissors conforming to O.S.H.A. regulations can be installed, with one or more padlocks, on the lockout assembly to prevent removal of the lock pin from the lockout assembly, thereby preventing removal of the lockout assembly from the circuit breaker. 2 figs.

Kozlowski, L.J.; Shirey, L.A.

1992-11-24T23:59:59.000Z

126

Circuit breaker lockout device  

DOE Patents (OSTI)

An improved lockout assembly for locking a circuit breaker in a selected off or on position is provided. The lockout assembly includes a lock block and a lock pin. The lock block has a hollow interior which fits over the free end of a switch handle of the circuit breaker. The lock block includes at least one hole that is placed in registration with a hole in the free end of the switch handle. A lock tab on the lock block serves to align and register the respective holes on the lock block and switch handle. A lock pin is inserted through the registered holes and serves to connect the lock block to the switch handle. Once the lock block and the switch handle are connected, the position of the switch handle is prevented from being changed by the lock tab bumping up against a stationary housing portion of the circuit breaker. When the lock pin is installed, an apertured-end portion of the lock pin is in registration with another hole on the lock block. Then a special scissors conforming to O.S.H.A. regulations can be installed, with one or more padlocks, on the lockout assembly to prevent removal of the lock pin from the lockout assembly, thereby preventing removal of the lockout assembly from the circuit breaker.

Kozlowski, L.J.; Shirey, L.A.

1991-12-31T23:59:59.000Z

127

Circuit breaker lockout device  

DOE Patents (OSTI)

An improved lockout assembly for locking a circuit breaker in a selected off or on position is provided. The lockout assembly includes a lock block and a lock pin. The lock block has a hollow interior which fits over the free end of a switch handle of the circuit breaker. The lock block includes at least one hole that is placed in registration with a hole in the free end of the switch handle. A lock tab on the lock block serves to align and register the respective holes on the lock block and switch handle. A lock pin is inserted through the registered holes and serves to connect the lock block to the switch handle. Once the lock block and the switch handle are connected, the position of the switch handle is prevented from being changed by the lock tab bumping up against a stationary housing portion of the circuit breaker. When the lock pin installed, an apertured-end portion of the lock pin is in registration with another hole on the lock block. Then a special scissors conforming to O.S.H.A. regulations can be installed, with one or more padlocks, on the lockout assembly to prevent removal of the lock pin from the lockout assembly, thereby preventing removal of the lockout assembly from the circuit breaker.

Kozlowski, Lawrence J. (New Kensington, PA); Shirey, Lawrence A. (North Huntingdon, PA)

1992-01-01T23:59:59.000Z

128

Experiment 2 Meter Circuits  

E-Print Network (OSTI)

1 Experiment 2 Meter Circuits Even in these days of digital circuitry, the d'Arsonval meter to stress a spring. The strain of the spring is read as a deflection of a scale. Most d'Arsonval meter the meter. In this experiment, the basic d'Arsonval meter movement and simple passive circuitry will be used

King, Roger

129

Automatic sweep circuit  

DOE Patents (OSTI)

An automatically sweeping circuit for searching for an evoked response in an output signal in time with respect to a trigger input. Digital counters are used to activate a detector at precise intervals, and monitoring is repeated for statistical accuracy. If the response is not found then a different time window is examined until the signal is found.

Keefe, Donald J. (Lemont, IL)

1980-01-01T23:59:59.000Z

130

High density electronic circuit and process for making  

DOE Patents (OSTI)

High density circuits with posts that protrude beyond one surface of a substrate to provide easy mounting of devices such as integrated circuits are disclosed. The posts also provide stress relief to accommodate differential thermal expansion. The process allows high interconnect density with fewer alignment restrictions and less wasted circuit area than previous processes. The resulting substrates can be test platforms for die testing and for multi-chip module substrate testing. The test platform can contain active components and emulate realistic operational conditions, replacing shorts/opens net testing. 8 figs.

Morgan, W.P.

1999-06-29T23:59:59.000Z

131

Short circuit power estimation of static CMOS circuits  

Science Conference Proceedings (OSTI)

This paper presents a simple method to estimate short-circuit power dissipation for static CMOS logic circuits. Short-circuit current expression is derived by accurately interpolating peak points of actual current curves which is influenced by the gate-to-drain ...

Seung-Ho Jung; Jong-Humn Baek; Seok-Yoon Kim

2001-01-01T23:59:59.000Z

132

Methods of fabricating applique circuits  

DOE Patents (OSTI)

Applique circuits suitable for advanced packaging applications are introduced. These structures are particularly suited for the simple integration of large amounts (many nanoFarads) of capacitance into conventional integrated circuit and multichip packaging technology. In operation, applique circuits are bonded to the integrated circuit or other appropriate structure at the point where the capacitance is required, thereby minimizing the effects of parasitic coupling. An immediate application is to problems of noise reduction and control in modern high-frequency circuitry.

Dimos, Duane B. (Albuquerque, NM); Garino, Terry J. (Albuquerque, NM)

1999-09-14T23:59:59.000Z

133

Development of a Novel Test Method for On-Demand Internal Short Circuit in a Li-Ion Cell (Presentation)  

DOE Green Energy (OSTI)

This presentation describes a cell-level test method that simulates an emergent internal short circuit, produces consistent and reproducible test results, can establish the locations and temperatures/power/SOC conditions where an internal short circuit will result in thermal runaway, and provides relevant data to validate internal short circuit models.

Keyser, M.; Long, D.; Jung, Y. S.; Pesaran, A.; Darcy, E.; McCarthy, B.; Patrick, L.; Kruger, C.

2011-01-01T23:59:59.000Z

134

GAS PHOTOTUBE CIRCUIT  

DOE Patents (OSTI)

This patent pertains to electronic circuits for measuring the intensity of light and is especially concerned with measurement between preset light thresholds. Such a circuit has application in connection with devices for reading-out information stored on punch cards or tapes where the cards and tapes are translucent. By the novel arrangement of this invention thc sensitivity of a gas phototube is maintained at a low value when the light intensity is below a first threshold level. If the light level rises above the first threshold level, the tube is rendered highly sensitive and an output signal will vary in proportion to the light intensity change. When the light level decreases below a second threshold level, the gas phototube is automatically rendered highly insensitive. Each of these threshold points is adjustable.

Richardson, J.H.

1958-03-01T23:59:59.000Z

135

A dynamic decisional approach for the reliability analysis of the steam cycle system in a combined thermal power plant.  

E-Print Network (OSTI)

??A dynamic probabilistic risk assessment approach is proposed in this dissertation. IDDA is a tool based on a decision-dynamic event tree, it allows us to… (more)

FRAGOMENI, UMBERTO

2008-01-01T23:59:59.000Z

136

A User Driven Dynamic Circuit Network Implementation  

Science Conference Proceedings (OSTI)

The requirements for network predictability are becoming increasingly critical to the DoE science community where resources are widely distributed and collaborations are world-wide. To accommodate these emerging requirements, the Energy Sciences Network has established a Science Data Network to provide user driven guaranteed bandwidth allocations. In this paper we outline the design, implementation, and secure coordinated use of such a network, as well as some lessons learned.

Guok, Chin; Robertson, David; Chaniotakis, Evangelos; Thompson, Mary; Johnston, William; Tierney, Brian

2008-10-01T23:59:59.000Z

137

A User Driven Dynamic Circuit Network Implementation  

E-Print Network (OSTI)

LCG-EGEE- 20080426.pdf ESnet (2008) [Online]. Available:the DOE Energy Science Network (ESnet) [5] has designed andIP core network. The ESnet IP core network is architected

Guok, Chin

2009-01-01T23:59:59.000Z

138

Sequential circuit design for radiation hardened multiple voltage integrated circuits  

DOE Patents (OSTI)

The present invention includes a radiation hardened sequential circuit, such as a bistable circuit, flip-flop or other suitable design that presents substantial immunity to ionizing radiation while simultaneously maintaining a low operating voltage. In one embodiment, the circuit includes a plurality of logic elements that operate on relatively low voltage, and a master and slave latches each having storage elements that operate on a relatively high voltage.

Clark, Lawrence T. (Phoenix, AZ); McIver, III, John K. (Albuquerque, NM)

2009-11-24T23:59:59.000Z

139

Jitter compensation circuit  

DOE Patents (OSTI)

The instantaneous V.sub.co signal on a charging capacitor is sampled and the charge voltage on capacitor C.sub.o is captured just prior to its discharge into the first stage of magnetic modulator. The captured signal is applied to an averaging circuit with a long time constant and to the positive input terminal of a differential amplifier. The averaged V.sub. co signal is split between a gain stage (G=0.975) and a feedback stage that determines the slope of the voltage ramp applied to the high speed comparator. The 97.5% portion of the averaged V.sub.co signal is applied to the negative input of a differential amplifier gain stage (G=10). The differential amplifier produces an error signal by subtracting 97.5% of the averaged V.sub.co signal from the instantaneous value of sampled V.sub.co signal and multiplying the difference by ten. The resulting error signal is applied to the positive input of a high speed comparator. The error signal is then compared to a voltage ramp that is proportional to the averaged V.sub.co values squared divided by the total volt-second product of the magnetic compression circuit.

Sullivan, James S. (Livermore, CA); Ball, Don G. (Livermore, CA)

1997-01-01T23:59:59.000Z

140

Jitter compensation circuit  

DOE Patents (OSTI)

The instantaneous V{sub co} signal on a charging capacitor is sampled and the charge voltage on capacitor C{sub o} is captured just prior to its discharge into the first stage of magnetic modulator. The captured signal is applied to an averaging circuit with a long time constant and to the positive input terminal of a differential amplifier. The averaged V{sub co} signal is split between a gain stage (G = 0.975) and a feedback stage that determines the slope of the voltage ramp applied to the high speed comparator. The 97.5% portion of the averaged V{sub co} signal is applied to the negative input of a differential amplifier gain stage (G = 10). The differential amplifier produces an error signal by subtracting 97.5% of the averaged V{sub co} signal from the instantaneous value of sampled V{sub co} signal and multiplying the difference by ten. The resulting error signal is applied to the positive input of a high speed comparator. The error signal is then compared to a voltage ramp that is proportional to the averaged V{sub co} values squared divided by the total volt-second product of the magnetic compression circuit. 11 figs.

Sullivan, J.S.; Ball, D.G.

1997-09-09T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Adaptive cooling of integrated circuits using digital microfluidics  

Science Conference Proceedings (OSTI)

Thermal management is critical for integrated circuit (IC) design. With each new IC technology generation, feature sizes decrease, while operating speeds and package densities increase. These factors contribute to elevated die temperatures detrimental ... Keywords: adaptive cooling, chip cooling, digital microfluidics, electrowetting, hot-spot cooling, microfluidics

Philip Y. Paik; Vamsee K. Pamula; Krishnendu Chakrabarty

2008-04-01T23:59:59.000Z

142

PRECISION TIME-DELAY CIRCUIT  

DOE Patents (OSTI)

A tine-delay circuit which produces a delay time in d. The circuit a capacitor, an te back resistance, connected serially with the anode of the diode going to ground. At the start of the time delay a negative stepfunction is applied to the series circuit and initiates a half-cycle transient oscillatory voltage terminated by a transient oscillatory voltage of substantially higher frequency. The output of the delay circuit is taken at the junction of the inductor and diode where a sudden voltage rise appears after the initiation of the higher frequency transient oscillations.

Creveling, R.

1959-03-17T23:59:59.000Z

143

Spike Neuromorphic Carbon Nanotube Circuits  

E-Print Network (OSTI)

plasticity Power consumption per device/circuit Scalabiiltydevice with low power consumption (nW/device), 2) to build athe learning. Fourth, power consumption per device should be

Kim, Kyunghyun

2013-01-01T23:59:59.000Z

144

Efficient circuit partitioning to extend cycle simulation beyond synchronous circuits  

Science Conference Proceedings (OSTI)

Cycle simulation techniques, such as levelized compiled code, can ordinarily be applied only to synchronous designs. They usually cannot be applied to designs containing circuit features like combinational paths, multiple clock domains, generated clocks, ... Keywords: logic simulation, cycle simulation, circuit partitioning, levelized compiled code

Charles J. DeVane

1997-11-01T23:59:59.000Z

145

ELECTRONIC INTEGRATING CIRCUIT  

DOE Patents (OSTI)

An electronic integrating circuit using a transistor with a capacitor connected between the emitter and collector through which the capacitor discharges at a rate proportional to the input current at the base is described. Means are provided for biasing the base with an operating bias and for applying a voltage pulse to the capacitor for charging to an initial voltage. A current dividing diode is connected between the base and emitter of the transistor, and signal input terminal means are coupled to the juncture of the capacitor and emitter and to the base of the transistor. At the end of the integration period, the residual voltage on said capacitor is less by an amount proportional to the integral of the input signal. Either continuous or intermittent periods of integration are provided. (AEC)

Englemann, R.H.

1963-08-20T23:59:59.000Z

146

Photoconductive circuit element reflectometer  

DOE Patents (OSTI)

A photoconductive reflectometer for characterizing semiconductor devices at millimeter wavelength frequencies where a first photoconductive circuit element (PCE) is biased by a direct current voltage source and produces short electrical pulses when excited into conductance by short first laser light pulses. The electrical pulses are electronically conditioned to improve the frequency related amplitude characteristics of the pulses which thereafter propagate along a transmission line to a device under test. Second PCEs are connected along the transmission line to sample the signals on the transmission line when excited into conductance by short second laser light pulses, spaced apart in time a variable period from the first laser light pulses. Electronic filters connected to each of the second PCEs act as low-pass filters and remove parasitic interference from the sampled signals and output the sampled signals in the form of slowed-motion images of the signals on the transmission line.

Rauscher, Christen (Alexandria, VA)

1990-01-01T23:59:59.000Z

147

Dynamic  

Office of Legacy Management (LM)

Dynamic Dynamic , and Static , Res.ponse of the Government Oil Shale Mine at ' , . , Rifle, Colorado, to the Rulison Event. , . ; . . DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. p ( y c - - a 2-1 0 -4- REPORT AT (29-2) 914 USBM 1 0 0 1 UNITED STATES DEPARTMENT O F THE I NTERIOR BUREAU OF MINES e s.09 P. L. R U S S E L L RESEARCH D l RECTOR Februory 2, lB7O DYNAMIC AND STATIC RESPONSE 'OF THE GOVERNMENT OIL SHALE MINE A T RIFLE, COLORADO, T O THE, RULISON EVENT ORDER FROM CFSTl A S ~ B ~ &J C / This page intentionally left blank CONTENTS Page . . . . . . . . . . . . . . . . . . . . . . . . . H i s t o r i c . a l Des c r i p t i o n 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Summary 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction 3

148

Online circuit breaker monitoring system  

E-Print Network (OSTI)

Circuit breakers are used in a power system to break or make current flow through power system apparatus. Reliable operation of circuit breakers is very important to the well-being of the power system. Historically this is achieved by regular inspection and maintenance of the circuit breakers. An automated online circuit breaker monitoring system is proposed to monitor condition, operation and status of high and medium voltage circuit breakers. By tracking equipment condition, this system could be used to perform maintenance only when it is needed. This could decrease overall maintenance cost and increase equipment reliability. Using high accurate time synchronization, this system should enable development of system-wide applications that utilize the data recorded by the system. This makes possible tracking sequence of events and making conclusions about their effect on-line. This solution also enables reliable topology analysis, which can be used to improve power flow analysis, state estimation and alarm processing.

Djekic, Zarko

2007-12-01T23:59:59.000Z

149

Resonant Tunneling Device Logic Circuits  

E-Print Network (OSTI)

This report is a summary of the activities in the field of resonant tunneling device circuit design. The presented work has been performed by the Department of Microelectronics of the University of Dortmund (UNIDO) and the Solid-State Electronics Department of the Gerhard-Mercator University of Duisburg (GMUD) during the first year of the Microelectronics Advanced Research Initiative projects ANSWERS (Autonomous Nanoelectronic Systems with Extended Replication and Signalling) and LOCOM (Logic Circuits with Reduced Complexity based on Devices with Higher Functionality). As part of the ANSWERS work-package the principal task of UNIDO is to investigate novel logic circuit architectures for resonant tunneling devices, to perform circuit simulations, and to specify the electrical device parameters. The basic device configuration is a monolithically integrated resonant tunneling diode heterostructure field-effect transistor (RTD-HFET). This device and the demonstrator circuits are fabricated by the LOCOM partner GMUD.

Christian Pacha; Peter Glösekötter; Karl Goser; Werner Prost; Uwe Auer; Franz-J. Tegude

1999-01-01T23:59:59.000Z

150

THERMAL PERFORMANCE OF BUILDINGS AND BUILDING ENVELOPE SYSTEMS: AN ANNOTATED BIBLIOGRAPHY  

E-Print Network (OSTI)

in predicting dynamic thermal performance by the admittancea lumped parameter thermal analog model for dynamic ther-5 Presented at the DOE/ASTM Thermal Insulation Conference,

Carroll, William L.

2011-01-01T23:59:59.000Z

151

BLOWER SYSTEM DYNAMICS  

SciTech Connect

An analysis is presented of the dynamics of a turboblower acting together with its connecting circuit. This is to be distinguished from the aero- thermodynamics involved in the design of the blower itself. The effect on system stability of blower and circuit characteristics is discussed. (auth)

Furgerson, W.T.

1958-04-16T23:59:59.000Z

152

Influence Of Three Dynamic Predictive Clothing Insulation Models On Building Energy Use, HVAC Sizing And Thermal Comfort  

E-Print Network (OSTI)

ON BUILDING ENERGY USE, HVAC SIZING AND THERMAL COMFORT aThe results showed that when the HVAC is controlled based onequipment sizing. When the HVAC is controlled based on the

Schiavon, Stefano; Lee, Kwang Ho

2013-01-01T23:59:59.000Z

153

Bottke et al.: Yarkovsky Effect and Asteroid Evolution 395 The Effect of Yarkovsky Thermal Forces on the Dynamical  

E-Print Network (OSTI)

Miroslav Broz Charles University, Prague The Yarkovsky effect is a thermal radiation force that causes states, shapes, and internal structures of the sur- viving bodies. The largest impact events are believed with short cosmic-ray- exposure (CR

Bottke, William F.

154

Dynamics  

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

Hydration Hydration Water on Rutile Studied by Backscattering Neutron Spectroscopy and Molecular Dynamics Simulation E. Mamontov,* ,† D. J. Wesolowski, ‡ L. Vlcek, § P. T. Cummings, §,| J. Rosenqvist, ‡ W. Wang, ⊥ and D. R. Cole ‡ Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473, Chemical Sciences DiVision, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6110, Department of Chemical Engineering, Vanderbilt UniVersity, NashVille, Tennessee 37235-1604, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6496, and EnVironmental Sciences DiVision, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6036 ReceiVed: December 20, 2007; ReVised Manuscript ReceiVed: June 4, 2008 The high energy resolution, coupled with the wide dynamic range, of the new backscattering

155

Overpulse railgun energy recovery circuit  

DOE Patents (OSTI)

The invention presented relates to a high-power pulsing circuit and more particularly to a repetitive pulse inductive energy storage and transfer circuit for an electromagnetic launcher. In an electromagnetic launcher such as a railgun for propelling a projectile at high velocity, an overpulse energy recovery circuit is employed to transfer stored inductive energy from a source inductor to the railgun inductance to propel the projectile down the railgun. Switching circuitry and an energy transfer capacitor are used to switch the energy back to the source inductor in readiness for a repetitive projectile propelling cycle.

Honig, E.M.

1984-09-28T23:59:59.000Z

156

Counterpulse railgun energy recovery circuit  

DOE Patents (OSTI)

The invention presented relates to a high-power pulsing circuit and more particularly to a repetitive pulse inductive energy storage and transfer circuit for an electromagnetic launcher. In an electromagnetic launcher such as a railgun for propelling a projectile at high velocity, a counterpulse energy recovery circuit is employed to transfer stored inductive energy from a source inductor to the railgun inductance to propel the projectile down the railgun. Switching circuitry and an energy transfer capacitor are used to switch the energy back to the source inductor in readiness for a repetitive projectile propelling cycle.

Honig, E.M.

1984-09-28T23:59:59.000Z

157

Electronic circuit for measuring series connected ...  

An electronic circuit for measuring voltage signals in an energy storage device is disclosed. The electronic circuit includes a plurality of energy storage cells ...

158

Comparator design and analysis for comparator-based switched-capacitor circuits  

E-Print Network (OSTI)

The design of high gain, wide dynamic range op-amps for switched-capacitor circuits has become increasingly challenging with the migration of designs to scaled CMOS technologies. The reduced power supply voltages and the ...

Sepke, Todd C. (Todd Christopher), 1975-

2007-01-01T23:59:59.000Z

159

Global Circuit Model with Clouds  

Science Conference Proceedings (OSTI)

Cloud data from the International Satellite Cloud Climatology Project (ISCCP) database have been introduced into the global circuit model developed by Tinsley and Zhou. Using the cloud-top pressure data and cloud type information, the authors ...

Limin Zhou; Brian A. Tinsley

2010-04-01T23:59:59.000Z

160

Battery charging and testing circuit  

SciTech Connect

A constant current battery charging circuit is provided by which the battery receives a full charge until the battery voltage reaches a threshold. When the battery voltage is above the threshold, the battery receives a trickle charge. The actual battery voltage is compared with a reference voltage to determine whether the full charge circuit should be in operation. Hysteresis is provided for preventing a rapid on/off operation around the threshold. The reference voltage is compensated for temperature variations. The hysteresis system and temperature compensation system are independent of each other. A separate test circuit is provided for testing the battery voltage. During testing of the battery, the full charge circuit is inoperative.

Wicnienski, M. F.; Charles, D. E.

1984-01-17T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Reverse engineering of integrated circuits  

DOE Patents (OSTI)

Software and a method therein to analyze circuits. The software comprises several tools, each of which perform particular functions in the Reverse Engineering process. The analyst, through a standard interface, directs each tool to the portion of the task to which it is most well suited, rendering previously intractable problems solvable. The tools are generally used iteratively to produce a successively more abstract picture of a circuit, about which incomplete a priori knowledge exists.

Chisholm, Gregory H. (Shorewood, IL); Eckmann, Steven T. (Colorado Springs, CO); Lain, Christopher M. (Pittsburgh, PA); Veroff, Robert L. (Albuquerque, NM)

2003-01-01T23:59:59.000Z

162

Highly Reproducible Nanolithography by Dynamic Plough of an Atomic-Force Microscope Tip and Thermal-Annealing Treatment  

Science Conference Proceedings (OSTI)

An approach has been developed to use atomic-force microscope (AFM) to pattern materials at the nanoscale in a controlled manner. By introducing a thermal-annealing process above the glass-transition temperature of poly (methylmethacrylate) (PMMA), the ... Keywords: 2-D electron gas, Atomic-force microscope (AFM), nanolithography, self-switching diodes (SSDs)

Xiaofeng Lu; C. Balocco; Fuhua Yang; A. M. Song

2011-01-01T23:59:59.000Z

163

Design of thermal imprinting system with uniform residual thickness  

Science Conference Proceedings (OSTI)

A new thermal imprinting system for the printed circuit boards (PCBs) with both large areas and fine conducting lines was developed adopting hot airs with a high pressure. Several small nickel stamps were used to cover the large area, and the stamps ... Keywords: Patterned circuit boards, Thermal imprinting system, Uniformity of residual thickness

Won-Ho Shin

2009-11-01T23:59:59.000Z

164

Faster Quantum Number Factoring via Circuit Synthesis  

E-Print Network (OSTI)

A major obstacle to implementing Shor's quantum number-factoring algorithm is the large size of modular-exponentiation circuits. We reduce this bottleneck by customizing reversible circuits for modular multiplication to individual runs of Shor's algorithm. Our circuit-synthesis procedure exploits spectral properties of multiplication operators and constructs optimized circuits from the traces of the execution of an appropriate GCD algorithm. Empirically, gate counts are reduced by 4-5 times, and circuit latency is reduced by larger factors.

Igor L. Markov; Mehdi Saeedi

2013-01-15T23:59:59.000Z

165

Cooling a quantum circuit via coupling to a multiqubit system  

E-Print Network (OSTI)

The cooling effects of a quantum LC circuit coupled inductively with an ensemble of artificial qubits are investigated. The particles may decay independently or collectively through their interaction with the environmental vacuum electromagnetic field reservoir. For appropriate bath temperatures and the resonator's quality factors, we demonstrate an effective cooling well below the thermal background. In particular, we found that for larger samples the cooling efficiency is better for independent qubits. However, the cooling process can be faster for collectively interacting particles.

Macovei, Mihai A

2010-01-01T23:59:59.000Z

166

Cooling a quantum circuit via coupling to a multiqubit system  

E-Print Network (OSTI)

The cooling effects of a quantum LC circuit coupled inductively with an ensemble of artificial qubits are investigated. The particles may decay independently or collectively through their interaction with the environmental vacuum electromagnetic field reservoir. For appropriate bath temperatures and the resonator's quality factors, we demonstrate an effective cooling well below the thermal background. In particular, we found that for larger samples the cooling efficiency is better for independent qubits. However, the cooling process can be faster for collectively interacting particles.

Mihai A. Macovei

2010-04-19T23:59:59.000Z

167

Circuit breaker lock out assembly  

DOE Patents (OSTI)

A lock out assembly for a circuit breaker which consists of a generally step-shaped unitary base with an aperture in the small portion of the step-shaped base and a roughly S shaped retaining pin which loops through the large portion of the step-shaped base. The lock out assembly is adapted to fit over a circuit breaker with the handle switch projecting through the aperture, and the retaining pin projecting into an opening of the handle switch, preventing removal.

Gordy, W.T.

1983-05-18T23:59:59.000Z

168

Circuit breaker lock out assembly  

Science Conference Proceedings (OSTI)

A lock out assembly for a circuit breaker which consists of a generally step-shaped unitary base with an aperture in the small portion of the step-shaped base and a roughly "S" shaped retaining pin which loops through the large portion of the step-shaped base. The lock out assembly is adapted to fit over a circuit breaker with the handle switch projecting through the aperture, and the retaining pin projecting into an opening of the handle switch, preventing removal.

Gordy, Wade T. (Jackson, SC)

1984-01-01T23:59:59.000Z

169

Sensor/source electrometer circuit  

DOE Patents (OSTI)

A multiple decade electrometer circuit is claimed which can measure low input currents or act as a current source and is comprised of a microprocessor controlled digital to analog converters to derive individual decades. A plurality of decades are created by multiple D-A voltage sources which generate electrometer currents through scaled resistors. After a first series of decades of current are successively produced, the converters are 10 cycled to generate current through new resistors scaled to produce another series decades of current. In this manner, the electrometer circuit generates or senses a plurality of decades of current without significant scale change.

Hughes, W.J.

1991-12-31T23:59:59.000Z

170

Wavelet based analysis of circuit breaker operation  

E-Print Network (OSTI)

Circuit breaker is an important interrupting device in power system network. It usually has a lifetime about 20 to 40 years. During breaker's service time, maintenance and inspection are imperative duties to achieve its reliable operation. To automate the diagnostic practice for circuit breaker operation and reduce the utility company's workload, Wavelet based analysis software of circuit breaker operation is developed here. Combined with circuit breaker monitoring system, the analysis software processes the original circuit breaker information, speeds up the analysis time and provides stable and consistent evaluation for the circuit breaker operation.

Ren, Zhifang Jennifer

2006-05-01T23:59:59.000Z

171

Battery charger polarity circuit control  

SciTech Connect

A normally open polarity sensing circuit is interposed between the charging current output of a battery charger and battery terminal clamps connected with a rechargeable storage battery. Normally open reed switches, closed by battery positive terminal potential, gates silicon controlled recitifiers for battery charging current flow according to the polarity of the battery.

Santilli, R.R.

1982-11-30T23:59:59.000Z

172

Low-voltage, low-power circuits for data communication systems  

E-Print Network (OSTI)

There are growing industrial demands for low-voltage supply and low-power consumption circuits and systems. This is especially true for very high integration level and very large scale integrated (VLSI) mixed-signal chips and system-on-a-chip. It is mainly due to the limited power dissipation within a small area and the costs related to the packaging and thermal management. In this research work, two low-voltage, low-power integrated circuits used for data communication systems are introduced. The first one is a high performance continuous-time linear phase filter with automatic frequency tuning. The filter can be used in hard disk driver systems and wired communication systems such as 1000Base-T transceivers. A pseudo-differential operational transconductance amplifier (OTA) based on transistors operating in triode region is used to achieve a large linear signal swing with low-voltage supplies. A common-mode (CM) control circuit that combines common-mode feedback (CMFB), common-mode feedforward (CMFF), and adaptive-bias has been proposed. With a 2.3V single supply, the filter?s total harmonic distortion is less than ?44dB for a 2VPP differential input, which is due to the well controlled CM behavior. The ratio of the root mean square value of the ac signal to the power supply voltage is around 31%, which is much better than previous realizations. The second integrated circuit includes two LVDS drivers used for high-speed point-to-point links. By removing the stacked switches used in the conventional structures, both LVDS drivers can operate with ultra low-voltage supplies. Although the Double Current Sources (DCS) LVDS driver draws twice minimum static current as required by the signal swing, it is quite simple and achieves very high speed operation. The Switchable Current Sources (SCS) LVDS driver, by dynamically switching the current sources, draws minimum static current and reduces the power consumption by 60% compared to the previously reported LVDS drivers. Both LVDS drivers are compliant to the standards and operate at data rates up to gigabits-per-second.

Chen, Mingdeng

2003-12-01T23:59:59.000Z

173

In-situ short-circuit protection system and method for high-energy electrochemical cells  

DOE Patents (OSTI)

An in-situ thermal management system for an energy storage device. The energy storage device includes a plurality of energy storage cells each being coupled in parallel to common positive and negative connections. Each of the energy storage cells, in accordance with the cell's technology, dimensions, and thermal/electrical properties, is configured to have a ratio of energy content-to-contact surface area such that thermal energy produced by a short-circuit in a particular cell is conducted to a cell adjacent the particular cell so as to prevent the temperature of the particular cell from exceeding a breakdown temperature. In one embodiment, a fuse is coupled in series with each of a number of energy storage cells. The fuses are activated by a current spike capacitively produced by a cell upon occurrence of a short-circuit in the cell, thereby electrically isolating the short-circuited cell from the common positive and negative connections.

Gauthier, Michel (La Prairie, CA); Domroese, Michael K. (South St. Paul, MN); Hoffman, Joseph A. (Minneapolis, MN); Lindeman, David D. (Hudson, WI); Noel, Joseph-Robert-Gaetan (St-Hubert, CA); Radewald, Vern E. (Austin, TX); Rouillard, Jean (Saint-Luc, CA); Rouillard, Roger (Beloeil, CA); Shiota, Toshimi (St. Bruno, CA); Trice, Jennifer L. (Eagan, MN)

2003-04-15T23:59:59.000Z

174

In-situ short circuit protection system and method for high-energy electrochemical cells  

DOE Patents (OSTI)

An in-situ thermal management system for an energy storage device. The energy storage device includes a plurality of energy storage cells each being coupled in parallel to common positive and negative connections. Each of the energy storage cells, in accordance with the cell's technology, dimensions, and thermal/electrical properties, is configured to have a ratio of energy content-to-contact surface area such that thermal energy produced by a short-circuit in a particular cell is conducted to a cell adjacent the particular cell so as to prevent the temperature of the particular cell from exceeding a breakdown temperature. In one embodiment, a fuse is coupled in series with each of a number of energy storage cells. The fuses are activated by a current spike capacitively produced by a cell upon occurrence of a short-circuit in the cell, thereby electrically isolating the short-circuited cell from the common positive and negative connections.

Gauthier, Michel (La Prairie, CA); Domroese, Michael K. (South St. Paul, MN); Hoffman, Joseph A. (Minneapolis, MN); Lindeman, David D. (Hudson, WI); Noel, Joseph-Robert-Gaetan (St-Hubert, CA); Radewald, Vern E. (Austin, TX); Rouillard, Jean (Saint-Luc, CA); Rouillard, Roger (Beloeil, CA); Shiota, Toshimi (St. Bruno, CA); Trice, Jennifer L. (Eagan, MN)

2000-01-01T23:59:59.000Z

175

Vertical Circuits Inc | Open Energy Information  

Open Energy Info (EERE)

Circuits Inc Circuits Inc Jump to: navigation, search Name Vertical Circuits, Inc. Place Scotts Valley, California Zip 95066 Sector Services Product Vertical Circuits Inc. is a global supplier of advanced die level vertical interconnect packaging technology, products, services and intellectual property for the manufacture of low cost ultra high-speed/high-density semiconductor components. References Vertical Circuits, Inc.[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Vertical Circuits, Inc. is a company located in Scotts Valley, California . References ↑ "Vertical Circuits, Inc." Retrieved from "http://en.openei.org/w/index.php?title=Vertical_Circuits_Inc&oldid=352802"

176

Post regulation circuit with energy storage  

DOE Patents (OSTI)

A charge regulation circuit provides regulation of an unregulated voltage supply and provides energy storage. The charge regulation circuit according to the present invention provides energy storage without unnecessary dissipation of energy through a resistor as in prior art approaches.

Ball, Don G. (Livermore, CA); Birx, Daniel L. (Oakley, CA); Cook, Edward G. (Livermore, CA)

1992-01-01T23:59:59.000Z

177

Quantum Circuit Simulation, 1st edition  

Science Conference Proceedings (OSTI)

Quantum Circuit Simulation covers the fundamentals of linear algebra and introduces basic concepts of quantum physics needed to understand quantum circuits and algorithms. It requires only basic familiarity with algebra, graph algorithms and computer ...

George F. Viamontes; Igor L. Markov; John P. Hayes

2009-12-01T23:59:59.000Z

178

Dual-circuit segmented rail phased induction motor - Energy ...  

An improved linear motor utilizes two circuits, rather that one circuit and an opposed plate, to gain efficiency. The powered circuit is a flat conductive coil. The ...

179

ENHANCEMENT OF ORGANIC PHOTOVOLTAIC CELL OPEN CIRCUIT ...  

enhancement of organic photovoltaic cell open circuit voltage using electron/hole blocking exciton blocking layers united states patent application

180

NPTEL Syllabus Basic Electrical Circuits -Video course  

E-Print Network (OSTI)

with an introduction to basic linear elements used in electrical circuits. Mesh and node analysis for systematic and energy in circuits will be discussed. Rudiments of three-phase circuits and their analysis; Energy in a mutual inductor and constraint on mutual inductance 5 Nodal analysis of a network

Krishnapura, Nagendra

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Ionization tube simmer current circuit  

DOE Patents (OSTI)

A highly efficient flash lamp simmer current circuit utilizes a fifty percent duty cycle square wave pulse generator to pass a current over a current limiting inductor to a full wave rectifier. The DC output of the rectifier is then passed over a voltage smoothing capacitor through a reverse current blocking diode to a flash lamp tube to sustain ionization in the tube between discharges via a small simmer current. An alternate embodiment of the circuit combines the pulse generator and inductor in the form of an FET off line square wave generator with an impedance limited step up output transformer which is then applied to the full wave rectifier as before to yield a similar simmer current.

Steinkraus, Jr., Robert F. (Livermore, CA)

1994-01-01T23:59:59.000Z

182

Ionization tube simmer current circuit  

DOE Patents (OSTI)

A highly efficient flash lamp simmer current circuit utilizes a fifty percent duty cycle square wave pulse generator to pass a current over a current limiting inductor to a full wave rectifier. The DC output of the rectifier is then passed over a voltage smoothing capacitor through a reverse current blocking diode to a flash lamp tube to sustain ionization in the tube between discharges via a small simmer current. An alternate embodiment of the circuit combines the pulse generator and inductor in the form of an FET off line square wave generator with an impedance limited step up output transformer which is then applied to the full wave rectifier as before to yield a similar simmer current. 6 figures.

Steinkraus, R.F. Jr.

1994-12-13T23:59:59.000Z

183

Condition responsive battery charging circuit  

SciTech Connect

A battery charging circuit includes a ferroresonant transformer having a rectified output for providing a constant output voltage to be supplied to a battery to be charged. Battery temperature is sensed providing an input to a control circuit which operates a shunt regulator associated with the ferroresonant transformer to provide battery charge voltage as a function of battery temperature. In response to a high battery temperature the controller functions to lower the output voltage to the battery, and in response to a low battery temperature, operates to provide a higher output voltage, with suitable control for any battery temperature between minus 10* and plus 150* fahrenheit. As the battery approaches full charge and battery acceptance current falls below a predetermined level, a charge cycle termination control allows charging to continue for a period preset by the operator, at the end of which period, line voltage is removed from the charger thereby terminating the charge cycle.

Reidenbach, S.G.

1980-06-24T23:59:59.000Z

184

Delta connected resonant snubber circuit  

SciTech Connect

A delta connected, resonant snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the dc supply voltage through the main inverter switches and the auxiliary switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter.

Lai, Jih-Sheng (Knoxville, TN); Peng, Fang Zheng (Oak Ridge, TN); Young, Sr., Robert W. (Oak Ridge, TN); Ott, Jr., George W. (Knoxville, TN)

1998-01-01T23:59:59.000Z

185

Delta connected resonant snubber circuit  

DOE Patents (OSTI)

A delta connected, resonant snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the dc supply voltage through the main inverter switches and the auxiliary switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter. 36 figs.

Lai, J.S.; Peng, F.Z.; Young, R.W. Sr.; Ott, G.W. Jr.

1998-01-20T23:59:59.000Z

186

Control circuit for combustion systems  

SciTech Connect

A control circuit is described for gas fired burners and the like such as are employed in commercial laundry fabric ironers requiring the energization of a blower motor and the resulting opening of a gas valve and ignition of a gas burner only after an air pressure sensitive switch is actuated through the operation of the blower motor for purging the system of combustible gases.

Kamberg, E.

1981-11-10T23:59:59.000Z

187

Counterpulse railgun energy recovery circuit  

SciTech Connect

In an electromagnetic launcher such as a railgun for propelling a projectile at high velocity, a counterpulse energy recovery circuit is employed to transfer stored inductive energy from a source inductor to the railgun inductance to propel the projectile down the railgun. Switching circuitry and an energy transfer capacitor are used to switch the energy back to the source inductor in readiness for a repetitive projectile propelling cycle.

Honig, Emanuel M. (Los Alamos, NM)

1986-01-01T23:59:59.000Z

188

CONTROL AND FAULT DETECTOR CIRCUIT  

DOE Patents (OSTI)

A power control and fault detectcr circuit for a radiofrequency system is described. The operation of the circuit controls the power output of a radio- frequency power supply to automatically start the flow of energizing power to the radio-frequency power supply and to gradually increase the power to a predetermined level which is below the point where destruction occurs upon the happening of a fault. If the radio-frequency power supply output fails to increase during such period, the control does not further increase the power. On the other hand, if the output of the radio-frequency power supply properly increases, then the control continues to increase the power to a maximum value. After the maximumn value of radio-frequency output has been achieved. the control is responsive to a ''fault,'' such as a short circuit in the radio-frequency system being driven, so that the flow of power is interrupted for an interval before the cycle is repeated.

Winningstad, C.N.

1958-04-01T23:59:59.000Z

189

Electrical circuit for data reduction  

DOE Patents (OSTI)

This invention is comprised of an electrical circuit for determining characteristic voltages, such as maximum, minimum, average and root mean squared voltages, of a time-varying electrical signal. The circuit comprises a positive and a negative peak detector that feed the positive and negative voltage peaks detected in each of a series of time intervals into a solid-state multiplexer controlled by a process controller. The time intervals are generated by the process controller in combination with a clocking, circuit. The multiplexer applies the positive and negative peak voltages to a set of four capacitors, apply the positive peak to one capacitor during one interval and then the negative peak to that capacitor in a subsequent interval so that each capacitor is alternatingly accumulating a positive peak then a negative peak to obviate the need for resetting each capacitor. After the positive peak voltage is applied to one capacitor, the connection is switched during the next interval for reading the negative peak voltage, then switched again for applying, a negative peak voltage, then switched once more for reading the negative peak voltage, the multiplexer serving, as a solid state commutator for switching the electrical connection. Alternatively, peak maximum and minimum voltage detectors may be replaced with circuitry designed to obtain the additional characteristic voltages desired in each interval.

Kronberg, J.W.

1991-12-31T23:59:59.000Z

190

Thermal-Aware CAD for Modern Integrated Circuits  

E-Print Network (OSTI)

meeting the voltage droop requirement. Some decap can be re-still ensuring that the voltage droop requirements are met.satisfying voltage droop requirements. Output: Decap

Logan, Sheldon Logan Paul

2013-01-01T23:59:59.000Z

191

Viability of dynamic cooling control in a data center environment  

E-Print Network (OSTI)

A. Beitelmal, “Thermal Considerations in Cooling Large Scalesmart cooling, dynamic thermal control, energy optimization,thermal management conditions. EP-04-1163, BASH Keywords: Data center cooling,

Boucher, T.; Auslander, D.; Bash, C.; Federspiel, C.; Patel, C.

2006-01-01T23:59:59.000Z

192

Method of determining the open circuit voltage of a battery in a closed circuit  

SciTech Connect

The open circuit voltage of a battery which is connected in a closed circuit is determined without breaking the circuit or causing voltage upsets therein. The closed circuit voltage across the battery and the current flowing through it are determined under normal load and then a fractional change is made in the load and the new current and voltage values determined. The open circuit voltage is then calculated, according to known principles, from the two sets of values.

Brown, William E. (Walnut Creek, CA)

1980-01-01T23:59:59.000Z

193

Definition: Automated Distribution Circuit Switches | Open Energy  

Open Energy Info (EERE)

Circuit Switches Circuit Switches Jump to: navigation, search Dictionary.png Automated Distribution Circuit Switches Distribution circuit switches that can be operated automatically in response to control signals from local sensors, distribution automation systems, or grid control systems. Such switches can be installed as automated devices or existing equipment can be retrofitted with controls and communications. The degree of automation depends on the controls and communications system implemented. These switches can be opened or closed to isolate portions of a distribution circuit that has experienced a short circuit (fault), or must be taken out of service for maintenance or other operations. When used in combination, these switches can reroute power from other substations or nearby distribution circuits.[1]

194

HANFORD DOUBLE SHELL TANK THERMAL AND SEISMIC PROJECT SENSITIVITY OF DOUBLE SHELL DYNAMIC RESPONSE TO THE WASTE ELASTIC PROPERTIES  

SciTech Connect

The purpose of this study was to determine the sensitivity of the dynamic response of the Hanford double-shell tanks (DSTs) to the assumptions regarding the constitutive properties of the contained waste. In all cases, the waste was modeled as a uniform linearly elastic material. The focus of the study was on the changes in the modal response of the tank and waste system as the extensional modulus (elastic modulus in tension and compression) and shear modulus of the waste were varied through six orders of magnitude. Time-history analyses were also performed for selected cases and peak horizontal reaction forces and axial stresses at the bottom of the primary tank were evaluated. Because the analysis focused on the differences in the responses between solid-filled and liquid-filled tanks, it is a comparative analysis rather than an analysis of record for a specific tank or set of tanks. The shear modulus was varied between 4 x 10{sup 3} Pa and 4.135 x 10{sup 9} Pa. The lowest value of shear modulus was sufficient to simulate the modal response of a liquid-containing tank, while the higher values are several orders of magnitude greater than the upper limit of expected properties for tank contents. The range of elastic properties used was sufficient to show liquid-like response at the lower values, followed by a transition range of semi-solid-like response to a clearly identifiable solid-like response. It was assumed that the mechanical properties of the tank contents were spatially uniform. Because sludge-like materials are expected only to exist in the lower part of the tanks, this assumption leads to an exaggeration of the effects of sludge-like materials in the tanks. The results of the study show that up to a waste shear modulus of at least 40,000 Pa, the modal properties of the tank and waste system are very nearly the same as for the equivalent liquid-containing tank. This suggests that the differences in critical tank responses between liquid-containing tanks and tanks containing sludge-like materials having a shear modulus not exceeding 40,000 Pa are unlikely to be greater than those due to the uncertainties involved in the definition of the design ground motion or in the properties of the tank-waste system. This is the fundamental conclusion of the study. The study also shows that increasing the waste extensional modulus and shear modulus does not lead to increased mass participation at the impulsive frequency of the liquid-containing system. Instead, increasing the waste stiffness eventually leads to fundamental changes in the modal properties including an increase in the fundamental system frequency.

MACKEY TC; ABATT FG; JOHNSON KI

2009-01-16T23:59:59.000Z

195

BSA 11-10: High Dynamic Range Measurements with Delayed ...  

... then the dynamic range of the system is set by the voltage ... The new circuit design will advance technology used in industrial automation, ... B ...

196

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other. 5 figures.

Ikezi, H.; Lin-Liu, Y.R.; DeGrassie, J.S.

1991-08-27T23:59:59.000Z

197

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other.

Ikezi, Hiroyuki (Rancho Santa Fe, CA); Lin-Liu, Yuh-Ren (San Diego, CA); DeGrassie, John S. (Encinitas, CA)

1991-01-01T23:59:59.000Z

198

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission lines between two adjacent periodic intersections to be longer than the other. 5 figs.

Ikezi, Hiroyuki; Lin-Liu, Yuh-Ren; deGrassie, J.S.

1990-03-02T23:59:59.000Z

199

Thermal via placement in 3D ICs  

E-Print Network (OSTI)

As thermal problems become more evident, new physical design paradigms and tools are needed to alleviate them. Incorporating thermal vias into integrated circuits (ICs) is a promising way of mitigating thermal issues by lowering the thermal resistance of the chip itself. However, thermal vias take up valuable routing space, and therefore, algorithms are needed to minimize their usage while placing them in areas where they would make the greatest impact. With the developing technology of three-dimensional integrated circuits (3D ICs), thermal problems are expected to be more prominent, and thermal vias can have a larger impact on them than in traditional 2D ICs. In this paper, thermal vias are assigned to specific areas of a 3D IC and used to adjust their effective thermal conductivities. The thermal via placement method makes iterative adjustments to these thermal conductivities in order to achieve a desired maximum temperature objective. Finite element analysis (FEA) is used in formulating the method and in calculating temperatures quickly during each iteration. As a result, the method efficiently achieves its thermal objective while minimizing the thermal via utilization.

Brent Goplen

2005-01-01T23:59:59.000Z

200

Multiplexer and time duration measuring circuit  

DOE Patents (OSTI)

A multiplexer device is provided for multiplexing data in the form of randomly developed, variable width pulses from a plurality of pulse sources to a master storage. The device includes a first multiplexer unit which includes a plurality of input circuits each coupled to one of the pulse sources, with all input circuits being disabled when one input circuit receives an input pulse so that only one input pulse is multiplexed by the multiplexer unit at any one time.

Gray, Jr., James (Downers Grove, IL)

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Monitoring transients in low inductance circuits  

DOE Patents (OSTI)

The instant invention relates to methods of and apparatus for monitoring transients in low inductance circuits and to a probe utilized to practice said method and apparatus. More particularly, the instant invention relates to methods of and apparatus for monitoring low inductance circuits, wherein the low inductance circuits include a pair of flat cable transmission lines. The instant invention is further directed to a probe for use in monitoring pairs of flat cable transmission lines.

Guilford, R.P.; Rosborough, J.R.

1985-10-21T23:59:59.000Z

202

Green Circuits: Distribution Efficiency Case Studies  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) Green Circuits project was a collaborative effort of 22 utilities. The main goal of the project was to evaluate ways to improve distribution efficiency. Modeling, economic evaluations, and field trials formed the core of the research effort. To evaluate efficiency improvements, 66 circuit case studies were modeled and fine-tuned, based on field data. Field trials of voltage optimization were implemented on nine circuits. Detailed advanced metering infrastructu...

2011-10-14T23:59:59.000Z

203

Asynchronous logic circuits and sheaf obstructions  

E-Print Network (OSTI)

This article exhibits a particular encoding of logic circuits into a sheaf formalism. The central result of this article is that there exists strictly more information available to a circuit designer in this setting than exists in static truth tables, but less than exists in event-level simulation. This information is related to the timing behavior of the logic circuits, and thereby provides a ``bridge'' between static logic analysis and detailed simulation.

Robinson, Michael

2010-01-01T23:59:59.000Z

204

Sequential Circuit Testing: From DFT to SFT  

Science Conference Proceedings (OSTI)

Sequential circuit testing is an active research area due to its applicability, its practicality, and its complexity. This paper gives an overview of the sequential automatic test pattern generation approaches and the classical and more recent design-for-testability ... Keywords: logic testing, sequential circuit testing, DFT techniques, automatic test pattern generation, design-for-testability methods, synthesis-for-testability, SFT techniques, large sequential circuits, ATPG

R. M. Chou; K. K. Saluja

1997-01-01T23:59:59.000Z

205

NIST Electromechanical Circuit Sets Record Beating ...  

Science Conference Proceedings (OSTI)

... NIST scientists plan to combine the new circuit ... its "ground state," or lowest-energy state ... could be manipulated for the applications mentioned above. ...

2011-10-14T23:59:59.000Z

206

Enhancing Open Circuit Voltage by Combining Thermoelectric ...  

Science Conference Proceedings (OSTI)

Enhancing Open Circuit Voltage by Combining Thermoelectric Materials and Dye -Sensitized Solar Cell in Series · Estimation of Compressive Strength of High ...

207

Optimising Circuit Design for Gravity Gold Recovery  

Science Conference Proceedings (OSTI)

Abstract Scope, To determine the optimal circuit configuration for gravity gold recovery ... Energy Management Planning, Following the ISO 50001 Draft Standard.

208

Circuit breaker monitoring application using wireless communication  

E-Print Network (OSTI)

Circuit breakers are used in the power system to break or make current flow through power apparatus. Reliable operation of circuit breakers is critical to the well- being of the power system and can be achieved by regular inspection and maintenance. A low-cost automated circuit breaker monitoring system is developed to monitor circuit breaker control signals. An interface is designed on top of which different local and system-wide applications can be developed which utilize the data recorded by the system. Some of the possible applications are proposed. Lab and field evaluation of the designed system is performed and results are presented.

Ved, Nitin

2005-12-01T23:59:59.000Z

209

Sequential power-up circuit  

DOE Patents (OSTI)

A sequential power-up circuit for starting several electrical load elements in series to avoid excessive current surge, comprising a voltage ramp generator and a set of voltage comparators, each comparator having a different reference voltage and interfacing with a switch that is capable of turning on one of the load elements. As the voltage rises, it passes the reference voltages one at a time and causes the switch corresponding to that voltage to turn on its load element. The ramp is turned on and off by a single switch or by a logic-level electrical signal. The ramp rate for turning on the load element is relatively slow and the rate for turning the elements off is relatively fast. Optionally, the duration of each interval of time between the turning on of the load elements is programmable. 2 figs.

Kronberg, J.W.

1992-06-02T23:59:59.000Z

210

Sequential power-up circuit  

DOE Patents (OSTI)

A sequential power-up circuit for starting several electrical load elements in series to avoid excessive current surge, comprising a voltage ramp generator and a set of voltage comparators, each comparator having a different reference voltage and interfacing with a switch that is capable of turning on one of the load elements. As the voltage rises, it passes the reference voltages one at a time and causes the switch corresponding to that voltage to turn on its load element. The ramp is turned on and off by a single switch or by a logic-level electrical signal. The ramp rate for turning on the load element is relatively slow and the rate for turning the elements off is relatively fast. Optionally, the duration of each interval of time between the turning on of the load elements is programmable.

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

1992-01-01T23:59:59.000Z

211

Quantum Interference in Plasmonic Circuits  

E-Print Network (OSTI)

Surface plasmon polaritons (plasmons) are a combination of light and a collective oscillation of the free electron plasma at metal-dielectric interfaces. This interaction allows sub-wavelength confinement of light, beyond the diffraction limit inherent to dielectric structures. The resulting electromagnetic fields are more intense and the strength of optical interactions between metallic structures and light-sources or detectors can be increased. Plasmons maintain non-classical photon statistics and preserve entanglement on plasmon-assisted transmission through thin, patterned metallic films or weakly confining waveguides. For quantum applications it is essential that plasmons behave as indistinguishable quantum particles. Here we report on a quantum interference experiment in a nanoscale plasmonic circuit consisting of an on-chip plasmon beam splitter with integrated superconducting single-photon detectors to allow efficient single plasmon detection. We demonstrate quantum mechanical interaction between pair...

Heeres, Reinier W; Zwiller, Valery

2013-01-01T23:59:59.000Z

212

Quantum transducer in circuit optomechanics  

E-Print Network (OSTI)

Mechanical resonators are macroscopic quantum objects with great potential. They couple to many different quantum systems such as spins, optical photons, cold atoms, and Bose Einstein condensates. It is however difficult to measure and manipulate the phonon state due to the tiny motion in the quantum regime. On the other hand, microwave resonators are powerful quantum devices since arbitrary photon state can be synthesized and measured with a quantum tomography. We show that a linear coupling, strong and controlled with a gate voltage, between the mechanical and the microwave resonators enables to create quantum phonon states, manipulate hybrid entanglement between phonons and photons and generate entanglement between two mechanical oscillators. In circuit quantum optomechanics, the mechanical resonator acts as a quantum transducer between an auxiliary quantum system and the microwave resonator, which is used as a quantum bus.

Didier, Nicolas; Blanter, Yaroslav M; Fazio, Rosario

2012-01-01T23:59:59.000Z

213

Near-field thermal transistor  

E-Print Network (OSTI)

Using a block of three separated solid elements, a thermal source and drain together with a gate made of an insulator-metal transition material exchanging near-field thermal radiation, we introduce a nanoscale analog of a field-effect transistor which is able to control the flow of heat exchanged by evanescent thermal photons between two bodies. By changing the gate temperature around its critical value, the heat flux exchanged between the hot body (source) and the cold body (drain) can be reversibly switched, amplified, and modulated by a tiny action on the gate. Such a device could find important applications in the domain of nanoscale thermal management and it opens up new perspectives concerning the development of contactless thermal circuits intended for information processing using the photon current rather than the electric current.

Ben-Abdallah, Philippe

2013-01-01T23:59:59.000Z

214

Adaptive Cooling of Integrated Circuits using Digital Microfluidics. Artech House  

E-Print Network (OSTI)

Abstract—Thermal management is critical for integrated circuit (IC) design. With each new IC technology generation, feature sizes decrease, while operating speeds and package densities increase. These factors contribute to elevated die temperatures detrimental to circuit performance and reliability. Furthermore, hot spots due to spatially nonuniform heat flux in ICs can cause physical stress that further reduces reliability. While a number of chip cooling techniques have been proposed in the literature, most are still unable to address the varying thermal profiles of an IC and their capability to remove a large amount of heat is undermined by their lack of reconfigurability of flows. We present an alternative cooling technique based on a recently invented "digital microfluidic " platform. This novel digital fluid handling platform uses a phenomenon known as electrowetting, and allows for a vast array of discrete droplets of liquid, ranging from microliters to nanoliters, and potentially picoliters, to be independently moved along a substrate. While this technology was originally developed for a biological and chemical lab-on-a-chip, we show how it can be adapted to be used as a fully reconfigurable, adaptive cooling platform. Index Terms—Adaptive cooling, chip cooling, digital microfluidics, electrowetting, hot-spot cooling, microfluidics. I.

Philip Y. Paik; Vamsee K. Pamula; Krishnendu Chakrabarty

2007-01-01T23:59:59.000Z

215

A Mixed Heuristic for Circuit Partitioning  

Science Conference Proceedings (OSTI)

As general-purpose parallel computers are increasingly being used to speed up different VLSI applications, the development of parallel algorithms for circuit testing, logic minimization and simulation, HDL-based synthesis, etc. is currently a field of ... Keywords: Tabu Search, circuit partitioning, optimisation, parallel test pattern generation, simulated annealing

C. Gil; J. Ortega; M. G. Montoya; R. Baños

2002-12-01T23:59:59.000Z

216

Multistable Circuits for Analog Memories Implementation  

Science Conference Proceedings (OSTI)

In this work two multistable circuits suitable for analog memories implementation will be presented. These circuits have been used to implement completely asynchronous analog memories, one type based on a flash converter and thus having a linear complexity ... Keywords: analog memories, asynchronous converters, successive approximations

Giorgio Biagetti; Massimo Conti; Simone Orcioni

2004-04-01T23:59:59.000Z

217

Experimentally driven verification of synthetic biological circuits  

Science Conference Proceedings (OSTI)

We present a framework that allows us to construct and formally analyze the behavior of synthetic gene circuits from specifications in a high level language used in describing electronic circuits. Our back-end synthesis tool automatically generates genetic-regulatory ...

Boyan Yordanov; Evan Appleton; Rishi Ganguly; Ebru Aydin Gol; Swati Banerjee Carr; Swapnil Bhatia; Traci Haddock; Calin Belta; Douglas Densmore

2012-03-01T23:59:59.000Z

218

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

219

Simultaneous power and thermal integrity driven via stapling in 3D ICs  

Science Conference Proceedings (OSTI)

The existing work on via-stapling in 3D integrated circuits optimizes power and thermal integrity separately and uses steadystate thermal analysis. This paper presents the first in-depth study on simultaneous power and thermal integrity driven viastapling ... Keywords: structured and parameterized model order reduction, thermal modeling and management

Hao Yu; Joanna Ho; Lei He

2006-11-01T23:59:59.000Z

220

Overload protection circuit for output driver  

DOE Patents (OSTI)

A protection circuit for preventing excessive power dissipation in an output transistor whose conduction path is connected between a power terminal and an output terminal. The protection circuit includes means for sensing the application of a turn on signal to the output transistor and the voltage at the output terminal. When the turn on signal is maintained for a period of time greater than a given period without the voltage at the output terminal reaching a predetermined value, the protection circuit decreases the turn on signal to, and the current conduction through, the output transistor.

Stewart, Roger G. (Neshanic Station, NJ)

1982-05-11T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Phase-change radiative thermal diode  

E-Print Network (OSTI)

A thermal diode transports heat mainly in one preferential direction rather than in the opposite direction. This behavior is generally due to the non-linear dependence of certain physical properties with respect to the temperature. Here we introduce a radiative thermal diode which rectifies heat transport thanks to the phase transitions of materials. Rectification coefficients greater than 70% and up to 90% are shown, even for small temperature differences. This result could have important applications in the development of futur contactless thermal circuits or in the conception of radiative coatings for thermal management.

Ben-Abdallah, Philippe

2013-01-01T23:59:59.000Z

222

Definition: Circuit Peak Load Management | Open Energy Information  

Open Energy Info (EERE)

Circuit Peak Load Management Jump to: navigation, search Dictionary.png Circuit Peak Load Management An application utilizing sensors, information processors, communications, and...

223

A Dynamic Model of Thundercloud Electric Fields  

Science Conference Proceedings (OSTI)

A dynamic interactive computer model of the electrical behavior of a thundercloud surrounded by the distributed atmosphere, earth, ionosphere circuit is described. The electrification mechanisms in the model are represented by current or voltage ...

John S. Nisbet

1983-12-01T23:59:59.000Z

224

THERMAL RECOVERY  

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

THERMAL RECOVERY Thermal recovery comprises the techniques of steamflooding, cyclic steam stimulation, and in situ combustion. In steamflooding, high-temperature steam is injected...

225

A routing architecture for scheduled dynamic circuit services  

Science Conference Proceedings (OSTI)

A wide range of applications in the nascent field of cloud computing and in other fields require stable, low-delay wide-area connectivity together with capabilities of co-scheduling network and server resources. As a result, both research and commercial ...

Malathi Veeraraghavan; David Starobinski

2010-11-01T23:59:59.000Z

226

Generating Circuit Tests by Exploiting Designed Behavior  

E-Print Network (OSTI)

This thesis describes two programs for generating tests for digital circuits that exploit several kinds of expert knowledge not used by previous approaches. First, many test generation problems can be solved efficiently ...

Shirley, Mark Harper

1988-12-01T23:59:59.000Z

227

Low Power Oriented CMOS Circuit Optimization Protocol  

Science Conference Proceedings (OSTI)

Low power oriented circuit optimization consists in selecting the best alternative between gate sizing, buffer insertion and logic structure transformation, for satisfying a delay constraint at minimum area cost. In this paper we used a closed form model ...

A. Verle; X. Michel; N. Azemard; P. Maurine; D. Auvergne

2005-03-01T23:59:59.000Z

228

Energy Extraction for the LHC Superconducting Circuits  

E-Print Network (OSTI)

The superconducting magnets of the LHC will be powered in about 1700 electrical circuits. The energy stored in circuits, up to 1.3 GJ, can potentially cause severe damage of magnets, bus bars and current leads. In order to protect the superconducting elements after a resistive transition, the energy is dissipated into a dump resistor installed in series with the magnet chain that is switched into the circuit by opening current breakers. Experiments and simulation studies have been performed to identify the LHC circuits that need energy extraction. The required values of the extraction resistors have been computed. The outcome of the experimental results and the simulation studies are presented and the design of the different energy extraction systems that operate at 600 A and at 13 kA is described.

Dahlerup-Petersen, K; Schmidt, R; Sonnemann, F

2001-01-01T23:59:59.000Z

229

Carbon nanotube synthesis for integrated circuit interconnects  

E-Print Network (OSTI)

Based on their properties, carbon nanotubes (CNTs) have been identified as ideal replacements for copper interconnects in integrated circuits given their higher current density, inertness, and higher resistance to ...

Nessim, Gilbert Daniel

2009-01-01T23:59:59.000Z

230

The Challenge of Testing RFID Integrated Circuits  

Science Conference Proceedings (OSTI)

RFID integrated circuits often involve many of themost leading edge production technologies availabletoday. The complexities involved with integrating thesecomplexities into the backend and test environment areexceptionally challenging. To date, this ...

David Murfett

2004-01-01T23:59:59.000Z

231

Conformance and mirroring for timed asychronous circuits  

Science Conference Proceedings (OSTI)

Conformance has been used as a correctness criterion for asynchronous circuits. In the case of untimed systems, conformance of an implementation to a specification is equivalent to the failure-freeness between the implementation and the mirror of the ...

Bin Zhou; Tomohiro Yoneda; Bernd-Holger Schlingloff

2001-01-01T23:59:59.000Z

232

Quantum computation beyond the circuit model  

E-Print Network (OSTI)

The quantum circuit model is the most widely used model of quantum computation. It provides both a framework for formulating quantum algorithms and an architecture for the physical construction of quantum computers. However, ...

Jordan, Stephen Paul

2008-01-01T23:59:59.000Z

233

Symbolic Analysis of Nonlinear Analog Circuits  

Science Conference Proceedings (OSTI)

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

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

2003-03-01T23:59:59.000Z

234

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

E-Print Network (OSTI)

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

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

2013-02-05T23:59:59.000Z

235

Electrochemically controlled charging circuit for storage batteries  

DOE Patents (OSTI)

An electrochemically controlled charging circuit for charging storage batteries is disclosed. The embodiments disclosed utilize dc amplification of battery control current to minimize total energy expended for charging storage batteries to a preset voltage level. The circuits allow for selection of Zener diodes having a wide range of reference voltage levels. Also, the preset voltage level to which the storage batteries are charged can be varied over a wide range.

Onstott, E.I.

1980-06-24T23:59:59.000Z

236

Industry-Wide Database: Circuit Breakers  

Science Conference Proceedings (OSTI)

Best practice maintenance and asset management decisions are based on risks associated with actual equipment condition and performance. However, little effort has been made to systematically collect and analyze such industry information for high-voltage circuit breakers. This document presents the results of the initial effort of the Electric Power Research Institute (EPRI) to explore the development of an industry-wide database (IDB) for high-voltage circuit breakers (HVCBs). The project identified ...

2012-12-12T23:59:59.000Z

237

Method and apparatus for thermal power generation  

DOE Patents (OSTI)

A method and apparatus for power generation from a recirculating superheat-reheat circuit with multiple expansion stages which alleviates complex control systems and minimizes thermal cycling of system components, particularly the reheater. The invention includes preheating cold reheat fluid from the first expansion stage prior to its entering the reheater with fluid from the evaporator or drum component.

Mangus, James D. (Hempfield Township, Westmoreland County, PA)

1979-01-01T23:59:59.000Z

238

Thermal Sensor Arrays for The Combinatorial Analysis of Thin Films  

E-Print Network (OSTI)

Thermal Sensor Arrays for The Combinatorial Analysis of Thin Films A dissertation presented Advisor Author Joost J. Vlassak Patrick J. McCluskey Thermal Sensor Arrays for The Combinatorial Analysis analysis of the thermophysical properties of thin films. The continuous growth of integrated circuits

239

Triple effect absorption chiller utilizing two refrigeration circuits  

DOE Patents (OSTI)

A triple effect absorption method and apparatus having a high coefficient of performance. Two single effect absorption circuits are combined with heat exchange occurring between a condenser and absorber of a high temperature circuit, and a generator of a low temperature circuit. The evaporators of both the high and low temperature circuits provide cooling to an external heat load.

DeVault, Robert C. (Knoxville, TN)

1988-01-01T23:59:59.000Z

240

Control circuit for automatic battery chargers  

SciTech Connect

An improved battery charger apparatus having a control circuit providing different charging periods which are automatically correlated with the type of battery connected to the charge for charging the connected battery to a preselected full charge state. The apparatus has a charging circuit for charging the battery, a sensing circuit for sensing the state of the battery during charging thereof by the charging circuit and a circuit for determining first and second predetermined reference voltage/current states. The apparatus causes the charging of the battery at a preselected initial charging level for an initial time period and establishes a first finish time period. The apparatus further determines a first time at which the state of the battery reaches the first predetermined referenced voltage/current state during the initial time period, and causes the charging circuit to continue to charge the battery at a preselected first charging level after the determination of the first time for a first finish time period. The apparatus further establishes a second finish time period and determines a second time at which the state of the battery reaches the second predetermined referenced voltage/current state during the first finish time period. The apparatus terminates charging of the battery if the state of the battery does not reach the second predetermined referenced voltage/current state during the first finish time period, and causes the charging circuit to continue to charge the battery at a preselected second charging level after the determination of the second time for a second finish time period.

Lambert, F.J.; Bosack, D.J.; Johansen, D.K.

1984-05-22T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Topology, Design, Analysis, and Thermal Management of Power Electronics for Hybrid Electric Vehicle Applications  

DOE Green Energy (OSTI)

Power electronics circuits play an important role in the success of electric, hybrid and fuel cell vehicles. Typical power electronics circuits in hybrid vehicles include electric motor drive circuits and DC/DC converter circuits. Conventional circuit topologies, such as buck converters, voltage source inverters and bidirectional boost converters are challenged by system cost, efficiency, controllability, thermal management, voltage and current capability, and packaging issues. Novel topologies, such as isolated bidirectional DC/DC converters, multilevel converters, and Z-source inverters, offer potential improvement to hybrid vehicle system performance, extended controllability and power capabilities. This paper gives an overview of the topologies, design, and thermal management, and control of power electronics circuits in hybrid vehicle applications.

Mi, C.; Peng, F. Z.; Kelly, K. J.; O'Keefe, M.; Hassani, V.

2008-01-01T23:59:59.000Z

242

Lookout device for high voltage circuit breaker  

DOE Patents (OSTI)

An improved lockout assembly is provided for a circuit breaker to lock the switch handle into a selected switch position. The lockout assembly includes two main elements, each having a respective foot for engaging a portion of the upper housing wall of the circuit breaker. The first foot is inserted into a groove in the upper housing wall, and the second foot is inserted into an adjacent aperture (e.g., a slot) in the upper housing wall. The first foot is slid under and into engagement with a first portion, and the second foot is slid under and into engagement with a second portion of the upper housing wall. At the same time the respective two feet are placed in engagement with the respective portions of the upper housing wall, two holes, one on each of the respective two main elements of the assembly, are placed in registration; and a locking device, such as a special scissors equipped with a padlock, is installed through the registered holes to secure the lockout assembly on the circuit breaker. When the lockout assembly of the invention is secured on the circuit breaker, the switch handle of the circuit breaker is locked into the selected switch position and prevented from being switched to another switch position.

Kozlowski, L.J.; Shirey, L.A.

1991-12-31T23:59:59.000Z

243

Lockout device for high voltage circuit breaker  

DOE Patents (OSTI)

An improved lockout assembly is provided for a circuit breaker to lock the switch handle into a selected switch position. The lockout assembly includes two main elements, each having a respective foot for engaging a portion of the upper housing wall of the circuit breaker. The first foot is inserted into a groove in the upper housing wall, and the second foot is inserted into an adjacent aperture (e.g., a slot) in the upper housing wall. The first foot is slid under and into engagement with a first portion, and the second foot is slid under and into engagement with a second portion of the upper housing wall. At the same time the respective two feet are placed in engagement with the respective portions of the upper housing wall, two holes, one on each of the respective two main elements of the assembly, are placed in registration; and a locking device, such as a special scissors equipped with a padlock, is installed through the registered holes to secure the lockout assembly on the circuit breaker. When the lockout assembly of the invention is secured on the circuit breaker, the switch handle of the circuit breaker is locked into the selected switch position and prevented from being switched to another switch position.

Kozlowski, L.J.; Shirey, L.A.

1993-01-26T23:59:59.000Z

244

Lockout device for high voltage circuit breaker  

Science Conference Proceedings (OSTI)

An improved lockout assembly is provided for a circuit breaker to lock the switch handle into a selected switch position. The lockout assembly includes two main elements, each having a respective foot for engaging a portion of the upper housing wall of the circuit breaker. The first foot is inserted into a groove in the upper housing wall, and the second foot is inserted into an adjacent aperture (e.g., a slot) in the upper housing wall. The first foot is slid under and into engagement with a first portion, and the second foot is slid under and into engagement with a second portion of the upper housing wall. At the same time the repsective two feet are placed in engagement with the respective portions of the upper housing wall, two holes, one on each of the respective two main elements of the assembly, are placed in registration; and a locking device, such as a special scissors equipped with a padlock, is installed through the registered holes to secure the lockout assembly on the circuit breaker. When the lockout assembly of the invention is secured on the circuit breaker, the switch handle of the circuit breaker is locked into the selected switch position and prevented from being switched to another switch position.

Kozlowski, Lawrence J. (New Kensington, PA); Shirey, Lawrence A. (North Huntingdon, PA)

1993-01-01T23:59:59.000Z

245

Dual circuit embossed sheet heat transfer panel  

DOE Patents (OSTI)

A heat transfer panel provides redundant cooling for fusion reactors or the like environment requiring low-mass construction. Redundant cooling is provided by two independent cooling circuits, each circuit consisting of a series of channels joined to inlet and outlet headers. The panel comprises a welded joinder of two full-size and two much smaller partial-size sheets. The first full-size sheet is embossed to form first portions of channels for the first and second circuits, as well as a header for the first circuit. The second full-sized sheet is then laid over and welded to the first full-size sheet. The first and second partial-size sheets are then overlaid on separate portions of the second full-sized sheet, and are welded thereto. The first and second partial-sized sheets are embossed to form inlet and outlet headers, which communicate with channels of the second circuit through apertures formed in the second full-sized sheet. 6 figs.

Morgan, G.D.

1984-02-21T23:59:59.000Z

246

Dual circuit embossed sheet heat transfer panel  

DOE Patents (OSTI)

A heat transfer panel provides redundant cooling for fusion reactors or the like environment requiring low-mass construction. Redundant cooling is provided by two independent cooling circuits, each circuit consisting of a series of channels joined to inlet and outlet headers. The panel comprises a welded joinder of two full-size and two much smaller partial-size sheets. The first full-size sheet is embossed to form first portions of channels for the first and second circuits, as well as a header for the first circuit. The second full-sized sheet is then laid over and welded to the first full-size sheet. The first and second partial-size sheets are then overlaid on separate portions of the second full-sized sheet, and are welded thereto. The first and second partial-sized sheets are embossed to form inlet and outlet headers, which communicate with channels of the second circuit through apertures formed in the second full-sized sheet.

Morgan, Grover D. (St. Louis County, MO)

1984-01-01T23:59:59.000Z

247

Equivalent circuit modeling of hybrid electric vehicle drive train  

E-Print Network (OSTI)

The main goals of the advanced vehicles designer are to improve efficiency, to decrease emissions and to meet customer's requirements. The design of such vehicles is challenging and cannot efficiently be achieved without an appropriate tool. The objective of this work is to develop and validate a modeling and design method adapted to advanced vehicles conception. The designer, as a system engineer, needs performances predictions and physical understanding of the system dynamics. In order to achieve this objective, a methodology based on electrical analogies and transducers theory is presented in this work. Using the powerful circuit theory to solve multi-disciplinary problems is not revolutionary, but applied to the design of advanced vehicles, it brings a strong insight and a visual, intuitive interpretation of the set of differential equations. The equivalent circuit obtained from this method offers an elegant alternative to traditional methods and is especially adapted to the study of the interactions between the mechanical and the electrical side of any electromechanical system.

Routex, Jean-Yves

2001-01-01T23:59:59.000Z

248

Package for integrated optic circuit and method  

DOE Patents (OSTI)

A structure and method for packaging an integrated optic circuit. The package comprises a first wall having a plurality of microlenses formed therein to establish channels of optical communication with an integrated optic circuit within the package. A first registration pattern is provided on an inside surface of one of the walls of the package for alignment and attachment of the integrated optic circuit. The package in one embodiment may further comprise a fiber holder for aligning and attaching a plurality of optical fibers to the package and extending the channels of optical communication to the fibers outside the package. In another embodiment, a fiber holder may be used to hold the fibers and align the fibers to the package. The fiber holder may be detachably connected to the package.

Kravitz, Stanley H. (26 Aspen Rd., Placitas, NM 87043); Hadley, G. Ronald (6012 Annapolis NE., Albuquerque, NM 87111); Warren, Mial E. (3825 Mary Ellen NE., Albuquerque, NM 87111); Carson, Richard F. (1036 Jewel Pl. NE., Albuquerque, NM 87123); Armendariz, Marcelino G. (1023 Oro Real NE., Albuquerque, NM 87123)

1998-01-01T23:59:59.000Z

249

Package for integrated optic circuit and method  

DOE Patents (OSTI)

A structure and method are disclosed for packaging an integrated optic circuit. The package comprises a first wall having a plurality of microlenses formed therein to establish channels of optical communication with an integrated optic circuit within the package. A first registration pattern is provided on an inside surface of one of the walls of the package for alignment and attachment of the integrated optic circuit. The package in one embodiment may further comprise a fiber holder for aligning and attaching a plurality of optical fibers to the package and extending the channels of optical communication to the fibers outside the package. In another embodiment, a fiber holder may be used to hold the fibers and align the fibers to the package. The fiber holder may be detachably connected to the package. 6 figs.

Kravitz, S.H.; Hadley, G.R.; Warren, M.E.; Carson, R.F.; Armendariz, M.G.

1998-08-04T23:59:59.000Z

250

Radiation-hardened transistor and integrated circuit  

DOE Patents (OSTI)

A composite transistor is disclosed for use in radiation hardening a CMOS IC formed on an SOI or bulk semiconductor substrate. The composite transistor has a circuit transistor and a blocking transistor connected in series with a common gate connection. A body terminal of the blocking transistor is connected only to a source terminal thereof, and to no other connection point. The blocking transistor acts to prevent a single-event transient (SET) occurring in the circuit transistor from being coupled outside the composite transistor. Similarly, when a SET occurs in the blocking transistor, the circuit transistor prevents the SET from being coupled outside the composite transistor. N-type and P-type composite transistors can be used for each and every transistor in the CMOS IC to radiation harden the IC, and can be used to form inverters and transmission gates which are the building blocks of CMOS ICs.

Ma, Kwok K. (Albuquerque, NM)

2007-11-20T23:59:59.000Z

251

Quantum Electric Circuits Analogous to Ballistic Conductors  

E-Print Network (OSTI)

The conductance steps in a constricted two-dimensional electron gas and the minimum conductivity in graphene are related to a new uncertainty relation between electric charge and conductance in a quantized electric circuit that mimics the electric transport in mesoscopic systems. This uncertainty relation makes specific use of the discreteness of electric charge. Quantum electric circuits analogous to both constricted two-dimensional electron gas and graphene are introduced. In the latter case a new insight into the origin of minimum conductivity is obtained.

Daniela Dragoman

2007-08-09T23:59:59.000Z

252

Hybrid high direct current circuit interrupter  

DOE Patents (OSTI)

A device and a method are disclosed for interrupting very high direct currents (greater than 100,000 amperes) and simultaneously blocking high voltages (greater than 600 volts). The device utilizes a mechanical switch to carry very high currents continuously with low loss and a silicon controlled rectifier (SCR) to bypass the current around the mechanical switch while its contacts are separating. A commutation circuit, connected in parallel with the SCR, turns off the SCR by utilizing a resonant circuit to divert the SCR current after the switch opens. 7 figs.

Rockot, J.H.; Mikesell, H.E.; Jha, K.N.

1998-08-11T23:59:59.000Z

253

Hybrid high direct current circuit interrupter  

DOE Patents (OSTI)

A device and a method for interrupting very high direct currents (greater than 100,000 amperes) and simultaneously blocking high voltages (greater than 600 volts). The device utilizes a mechanical switch to carry very high currents continuously with low loss and a silicon controlled rectifier (SCR) to bypass the current around the mechanical switch while its contacts are separating. A commutation circuit, connected in parallel with the SCR, turns off the SCR by utilizing a resonant circuit to divert the SCR current after the switch opens.

Rockot, J.H.; Mikesell, H.E.; Jha, K.N.

1996-12-31T23:59:59.000Z

254

Thermal Analysis of a SHIELD Electromigration Test Structure  

Science Conference Proceedings (OSTI)

The steady state and transient thermal behavior of an electromigration test structure was analyzed. The test structure was a Sandia SHIELD (Self-stressing HIgh fregquency rELiability Device) electromigration test device manufactured by an outside vendor. This device has a high frequency oscillator circuit, a buffer circuit to isolate and drive the metal line to the tested (DUT), the DUT to be electromigrated itself, a metal resistance thermometry monitor, and a heater elment to temperature accelerate the electromigration effect.

Benson, David A.; Bowman, Duane J.; Mitchell, Robert T.

1999-05-01T23:59:59.000Z

255

Electronic circuit for measuring series connected electrochemical cell voltages  

DOE Patents (OSTI)

An electronic circuit for measuring voltage signals in an energy storage device is disclosed. The electronic circuit includes a plurality of energy storage cells forming the energy storage device. A voltage divider circuit is connected to at least one of the energy storage cells. A current regulating circuit is provided for regulating the current through the voltage divider circuit. A voltage measurement node is associated with the voltage divider circuit for producing a voltage signal which is proportional to the voltage across the energy storage cell.

Ashtiani, Cyrus N. (West Bloomfield, MI); Stuart, Thomas A. (Toledo, OH)

2000-01-01T23:59:59.000Z

256

Time-Mode Analog Circuit Design for Nanometric Technologies  

E-Print Network (OSTI)

Rapid scaling in technology has introduced new challenges in the realm of traditional analog design. Scaling of supply voltage directly impacts the available voltage-dynamic-range. On the other hand, nanometric technologies with fT in the hundreds of GHz range open opportunities for time-resolution-based signal processing. With reduced available voltage-dynamic-range and improved timing resolution, it is more convenient to devise analog circuits whose performance depends on edge-timing precision rather than voltage levels. Thus, instead of representing the data/information in the voltage-mode, as a difference between two node voltages, it should be represented in time-mode as a time-difference between two rising and/or falling edges. This dissertation addresses the feasibility of employing time-mode analog circuit design in different applications. Specifically: 1) Time-mode-based quanitzer and feedback DAC of SigmaDelta ADC. 2) Time-mode-based low-THD 10MHz oscillator, 3) A Spur-Frequency Boosting PLL with -74dBc Reference-Spur Rejection in 90nm Digital CMOS. In the first project, a new architectural solution is proposed to replace the DAC and the quantizer by a Time-to-Digital converter. The architecture has been fabricated in 65nm and shows that this technology node is capable of achieving a time-matching of 800fs which has never been reported. In addition, a competitive figure-of-merit is achieved. In the low-THD oscillator, I proposed a new architectural solution for synthesizing a highly-linear sinusoidal signal using a novel harmonic rejection approach. The chip is fabricated in 130nm technology and shows an outstanding performance compared to the state of the art. The designed consumes 80% less power; consumes less area; provides much higher amplitude while being composed of purely digital circuits and passive elements. Last but not least, the spur-frequency boosting PLL employs a novel technique that eliminates the reference spurs. Instead of adding additional filtering at the reference frequency, the spur frequency is boosted to higher frequency which is, naturally, has higher filtering effects. The prototype is fabricated in 90nm digital CMOS and proved to provide the lowest normalized reference spurs ever reported.

Elsayed, Mohamed

2011-12-01T23:59:59.000Z

257

Grinding circuit control using programmable logic controllers  

Science Conference Proceedings (OSTI)

This paper presents an application for cement milling system. In this application the process is controlled by software running on Programmable Logic Controllers. The appliance used to observe industrial process show the following mill parameters: feed ... Keywords: PLC programming, ball mill, clinker grinding, grinding circuit, programmable logic controllers

Costea R. Claudiu; Silaghi Helga Maria; Rohde L. Ulrich; Silaghi A. Marius

2011-08-01T23:59:59.000Z

258

Three-dimensional Integrated Circuit Design  

Science Conference Proceedings (OSTI)

With vastly increased complexity and functionality in the "nanometer era" (i.e. hundreds of millions of transistors on one chip), increasing the performance of integrated circuits has become a challenging task. This is due primarily to the inevitable ... Keywords: Computer Architecture, Computer Engineering, Computer Science

Vasilis F. Pavlidis; Eby G. Friedman

2008-09-01T23:59:59.000Z

259

High Voltage Thermal Battery Reliability Required to Equal Inverter-Converter Systems  

SciTech Connect

MC-583 and XMC-650 circuits, including associated pulse transformers, are compare with the inverter-converter system typical of present fuses. The required probabilities of thermal battery shorts and opens are determined.

1955-06-14T23:59:59.000Z

260

Circuit design for embedded memory in low-power integrated circuits  

E-Print Network (OSTI)

This thesis explores the challenges for integrating embedded static random access memory (SRAM) and non-volatile memory-based on ferroelectric capacitor technology-into lowpower integrated circuits. First considered is the ...

Qazi, Masood

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Power minimization for dynamically reconfigurable FPGA partitioning  

Science Conference Proceedings (OSTI)

Dynamically reconfigurable FPGA (DRFPGA) implements a given circuit system by partitioning it into stages and then executing each stage sequentially. Traditionally, the number of communication buffers is minimized. In this article, we study the partitioning ... Keywords: Dynamically reconfigurable FPGA, power optimization, reconfigurable computing, temporal partitioning

Tzu-Chiang Tai; Yen-Tai Lai

2013-03-01T23:59:59.000Z

262

Parallel algorithms for inductance extraction of VLSI circuits  

Science Conference Proceedings (OSTI)

Inductance extraction involves estimating the mutual inductance in a VLSI circuit. Due to increasing clock speed and diminishing feature sizes of modern VLSI circuits, the effects of inductance are increasingly felt during the testing and verification ...

Hemant Mahawar; Vivek Sarin

2006-04-01T23:59:59.000Z

263

The sizing rules method for analog integrated circuit design  

Science Conference Proceedings (OSTI)

This paper presents the sizing rules method for analog CMOS circuit design that consists of: first, the development of a hierarchical library of transistor pair groups as basic building blocks for analog CMOS circuits; second, the derivation of ...

H. Graeb; S. Zizala; J. Eckmueller; K. Antreich

2001-11-01T23:59:59.000Z

264

Low thermal resistance power module assembly  

DOE Patents (OSTI)

A power module assembly with low thermal resistance and enhanced heat dissipation to a cooling medium. The assembly includes a heat sink or spreader plate with passageways or openings for coolant that extend through the plate from a lower surface to an upper surface. A circuit substrate is provided and positioned on the spreader plate to cover the coolant passageways. The circuit substrate includes a bonding layer configured to extend about the periphery of each of the coolant passageways and is made up of a substantially nonporous material. The bonding layer may be solder material which bonds to the upper surface of the plate to provide a continuous seal around the upper edge of each opening in the plate. The assembly includes power modules mounted on the circuit substrate on a surface opposite the bonding layer. The power modules are positioned over or proximal to the coolant passageways.

Hassani, Vahab (Denver, CO); Vlahinos, Andreas (Castle Rock, CO); Bharathan, Desikan (Arvada, CO)

2007-03-13T23:59:59.000Z

265

Dual-circuit segmented rail phased induction motor  

DOE Patents (OSTI)

An improved linear motor utilizes two circuits, rather that one circuit and an opposed plate, to gain efficiency. The powered circuit is a flat conductive coil. The opposed segmented rail circuit is either a plurality of similar conductive coils that are shorted, or a plurality of ladders formed of opposed conductive bars connected by a plurality of spaced conductors. In each embodiment, the conductors are preferably cables formed from a plurality of intertwined insulated wires to carry current evenly.

Marder, Barry M. (Albuquerque, NM); Cowan, Jr., Maynard (Albuquerque, NM)

2002-01-01T23:59:59.000Z

266

Field Guide: High-Voltage Circuit Breaker Compressors – 2013 Update  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breaker mechanisms have multiple components that must operate in concert in order for the breaker to perform properly. If one component, such as the air or hydraulic system, does not operate correctly, the circuit breaker may mis-operate or fail. A circuit breaker mis-operation may cause equipment damage and outages—both ...

2013-12-19T23:59:59.000Z

267

Designing Crushing and Grinding Circuits for Improved Energy ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Crushing and grinding, or comminution, circuits are the most ... Materialization of Manganese by Selective Precipitation from Used Battery.

268

Development of a numerical computer code and circuit element models for simulation of firing systems  

SciTech Connect

Numerical simulation of firing systems requires both the appropriate circuit analysis framework and the special element models required by the application. We have modified the SPICE circuit analysis code (version 2G.6), developed originally at the Electronic Research Laboratory of the University of California, Berkeley, to allow it to be used on MSDOS-based, personal computers and to give it two additional circuit elements needed by firing systems--fuses and saturating inductances. An interactive editor and a batch driver have been written to ease the use of the SPICE program by system designers, and the interactive graphical post processor, NUTMEG, supplied by U. C. Berkeley with SPICE version 3B1, has been interfaced to the output from the modified SPICE. Documentation and installation aids have been provided to make the total software system accessible to PC users. Sample problems show that the resulting code is in agreement with the FIRESET code on which the fuse model was based (with some modifications to the dynamics of scaling fuse parameters). In order to allow for more complex simulations of firing systems, studies have been made of additional special circuit elements--switches and ferrite cored inductances. A simple switch model has been investigated which promises to give at least a first approximation to the physical effects of a non ideal switch, and which can be added to the existing SPICE circuits without changing the SPICE code itself. The effect of fast rise time pulses on ferrites has been studied experimentally in order to provide a base for future modeling and incorporation of the dynamic effects of changes in core magnetization into the SPICE code. This report contains detailed accounts of the work on these topics performed during the period it covers, and has appendices listing all source code written documentation produced.

Carpenter, K.H. (Kansas State Univ., Manhattan, KS (USA). Dept. of Electrical and Computer Engineering)

1990-07-02T23:59:59.000Z

269

THERMAL CONDUCTIVITY ANALYSIS OF GASES  

DOE Patents (OSTI)

This patent describes apparatus for the quantitative analysis of a gaseous mixture at subatmospheric pressure by measurement of its thermal conductivity. A heated wire forms one leg of a bridge circuit, while the gas under test is passed about the wire at a constant rate. The bridge unbalance will be a measure of the change in composition of the gas, if compensation is made for the effect due to gas pressure change. The apparatus provides a voltage varying with fluctuations of pressure in series with the indicating device placed across the bridge, to counterbalance the voltage change caused by fluctuations in the pressure of the gaseous mixture.

Clark, W.J.

1949-06-01T23:59:59.000Z

270

Transistor sizing for large combinational digital CMOS circuits  

Science Conference Proceedings (OSTI)

This article describes a new method to determine the device sizes of combinational digital CMOS circuits for an upper limit on the signal propagation delays. By modeling gate delay and area or power consumption of a circuit as a simple analytical function ... Keywords: Transistor sizing, digital combinational CMOS circuits, timing optimization

Lucas S. Heusler; Wolfgang Fichtner

1991-01-01T23:59:59.000Z

271

Analytical Model for the CMOS Short-Circuit Power Dissipation  

Science Conference Proceedings (OSTI)

A significant part of the power dissipation in CMOS digital circuits is due to the short-circuit currents. In this paper an accurate analytical model for the evaluation of the CMOS short-circuit power dissipation, on the basis of a CMOS inverter, is ...

L. Bisdounis; S. Nikolaidis; O. Koufopavlou

1998-04-01T23:59:59.000Z

272

Intelligent Circuit Breaker Forecasting and Prewarning System Research  

Science Conference Proceedings (OSTI)

This paper describes an intelligent circuit breaker software and hardware design, real-time multi-task alarm system will be introduced into circuit breaker monitoring and control, to the timely opening and timely alarm. According to the different impact ... Keywords: Intelligent circuit breaker, forecasting, prewarning

Jiaomin Liu; Li Li; Yaxuan Li; Peng Liu

2008-10-01T23:59:59.000Z

273

A hardware Memetic accelerator for VLSI circuit partitioning  

Science Conference Proceedings (OSTI)

During the last decade, the complexity and size of circuits have been rapidly increasing, placing a stressing demand on industry for faster and more efficient CAD tools for VLSI circuit layout. One major problem is the computational requirements for ... Keywords: Circuit partitioning, FPGA, Genetic algorithms, Handel-C, Hardware accelerator, Memetic algorithms

Stephen Coe; Shawki Areibi; Medhat Moussa

2007-07-01T23:59:59.000Z

274

Evaluation and Testing of ABB Circuit Breakers with Mobilgrease 28  

Science Conference Proceedings (OSTI)

The information in this document is intended to assist plants in evaluating the use of Mobilgrease 28 in ABB K-Line and HK circuit breakers and determining the maintenance intervals of these circuit breakers. The information in this document is applicable to both ABB K-Line and HK (air-blast) circuit breakers.

2001-10-30T23:59:59.000Z

275

Characterization of AMOLED pixel circuit without power line  

Science Conference Proceedings (OSTI)

We fabricated and evaluated the simple active matrix organic light emitting diode (AMOLED) pixel circuits without power line and proved that it is useful for the AMOLED display. Without power line in the pixel circuit we got higher-aperture ratio of ... Keywords: AMOLED, OLED, Pixel circuit, Thin film transistor

Seon Pyo Hong; Dong Sung Moon; Byung Seong Bae

2012-01-01T23:59:59.000Z

276

A Mixed Signal Fuzzy Controller Using Current Mode Circuits  

Science Conference Proceedings (OSTI)

A mixed analog-digital fuzzy logic inference processor chip, designed in a 0.35-?m CMOS technology, is presented. The analog fuzzy engine is based on a novel current-mode CMOS circuit used for the implementation of fuzzy partition membership functions. ... Keywords: current-mode circuits, fuzzy partitioning, inference engine, membership function circuits

Simone Orcioni; Giorgio Biagetti; Massimo Conti

2004-02-01T23:59:59.000Z

277

Automatic stability checking for large linear analog integrated circuits  

Science Conference Proceedings (OSTI)

Stability analysis is one of the key challenges in the design of large linear analog circuits with complex multi-loop structures. In this paper, we present an efficient loop finder algorithm to identify potentially unstable loops in such circuits. At ... Keywords: analog circuit design, eigenvalue problem, model order reduction, small-signal analysis, stability analysis

Parijat Mukherjee; G. Peter Fang; Rod Burt; Peng Li

2011-06-01T23:59:59.000Z

278

Symbolic analysis of analog circuits with hard nonlinearity  

Science Conference Proceedings (OSTI)

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

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

2003-06-01T23:59:59.000Z

279

TRIAC/SCR proportional control circuit  

DOE Patents (OSTI)

A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage-to frequency converter controls the "reset" input of a R-S flip flop, while an "0" crossing detector controls the "set" input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the "reset" and "set" inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations.

Hughes, Wallace J. (Boston Lake, NY)

1999-01-01T23:59:59.000Z

280

TRIAC/SCR proportional control circuit  

DOE Patents (OSTI)

A power controller device is disclosed which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage-to frequency converter controls the ``reset`` input of a R-S flip flop, while an ``0`` crossing detector controls the ``set`` input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the ``reset`` and ``set`` inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations. 9 figs.

Hughes, W.J.

1999-04-06T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

TRIAC/SCR proportional control circuit  

DOE Patents (OSTI)

A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage to frequency converter controls the reset input of a R-S flip flop, while an 0 crossing detector controls the set input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the reset and set inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations.

Hughes, Wallace J.

1997-12-01T23:59:59.000Z

282

Vacuum die attach for integrated circuits  

DOE Patents (OSTI)

A thin film eutectic bond for attaching an integrated circuit die to a circuit substrate is formed by coating at least one bonding surface on the die and substrate with an alloying metal, assembling the die and substrate under compression loading, and heating the assembly to an alloying temperature in a vacuum. A very thin bond, 10 microns or less, which is substantially void free, is produced. These bonds have high reliability, good heat and electrical conduction, and high temperature tolerance. The bonds are formed in a vacuum chamber, using a positioning and loading fixture to compression load the die, and an IR lamp or other heat source. For bonding a silicon die to a silicon substrate, a gold silicon alloy bond is used. Multiple dies can be bonded simultaneously. No scrubbing is required.

Schmitt, Edward H. (Livermore, CA); Tuckerman, David B. (Livermore, CA)

1991-01-01T23:59:59.000Z

283

Vacuum die attach for integrated circuits  

DOE Patents (OSTI)

A thin film eutectic bond for attaching an integrated circuit die to a circuit substrate is formed by coating at least one bonding surface on the die and substrate with an alloying metal, assembling the die and substrate under compression loading, and heating the assembly to an alloying temperature in a vacuum. A very thin bond, 10 microns or less, which is substantially void free, is produced. These bonds have high reliability, good heat and electrical conduction, and high temperature tolerance. The bonds are formed in a vacuum chamber, using a positioning and loading fixture to compression load the die, and an IR lamp or other heat source. For bonding a silicon die to a silicon substrate, a gold silicon alloy bond is used. Multiple dies can be bonded simultaneously. No scrubbing is required. 1 figure.

Schmitt, E.H.; Tuckerman, D.B.

1991-09-10T23:59:59.000Z

284

Circuit Breaker Reference Book: Proposed Development Approach  

Science Conference Proceedings (OSTI)

Utilities have been maintaining circuit breakers reliably for many years. However, the aging breaker population and the more recent adaptation of analytical asset management techniques, coupled with a challenging business environment and a decline in available subject matter expertise, have made the task more difficult.Through more than two decades of research and development, the Electric Power Research Institute (EPRI) has amassed a large knowledge base of information on high-voltage ...

2013-12-20T23:59:59.000Z

285

Using Relays for Circuit Breaker Diagnostics  

Science Conference Proceedings (OSTI)

This report updates the ongoing investigation by the Electric Power Research Institute (EPRI) of how microprocessor based protective relays programmed with logic and measurements can monitor trip time performance of power circuit breakers and alarm for malfunctions or wear problems. The report describes the programming developed by the EPRI and American Transmission Company (ATC) project team to use existing relays to time first trips of selected breakers. ATC carried out laboratory ...

2012-12-13T23:59:59.000Z

286

Circuit Breaker Diagnostic Tests: Effectiveness Assessment  

Science Conference Proceedings (OSTI)

This report presents preliminary findings from a multiyear research initiative to improve the maintenance of high-voltage circuit breakers and maintain reliable performance with reduced costs through better selection and application of nonintrusive diagnostic tests and techniques. The initiative’s focus is to catalog available tests and techniques and to develop and apply assessment metrics to determine which provide the most useful information.The project team developed a set of ...

2013-12-22T23:59:59.000Z

287

Base drive and overlap protection circuit  

DOE Patents (OSTI)

An inverter (34) which provides power to an A. C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A. C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A. C. machine is optimized. The control circuit includes a microcomputer and memory element which receive various parametric inputs and calculate optimized machine control data signals therefrom. The control data is asynchronously loaded into the inverter through an intermediate buffer (38). A base drive and overlap protection circuit is included to insure that both transistors of a complimentary pair are not conducting at the same time. In its preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack (32) and a three-phase induction motor (18).

Gritter, David J. (Southfield, MI)

1983-01-01T23:59:59.000Z

288

Thermally Driven and Eddy-Driven Jet Variability in Reanalysis  

Science Conference Proceedings (OSTI)

Two important dynamical processes influence the extratropical zonal wind field: angular momentum transport by the thermally direct Hadley circulation (thermal-driving T) and momentum flux convergence by atmospheric waves (eddies) that develop in ...

Camille Li; Justin J. Wettstein

2012-03-01T23:59:59.000Z

289

Photonic circuits for iterative decoding of a class of low-density parity-check codes  

E-Print Network (OSTI)

Photonic circuits in which stateful components are coupled via guided electromagnetic fields are natural candidates for native implementation of iterative stochastic algorithms based on propagation of information around a graph. Conversely, such message passing algorithms suggest novel circuit architectures for signal processing and computation that are well matched to nanophotonic device physics. Here we construct and analyze a quantum optical model of a photonic circuit for iterative decoding of a class of low-density parity-check (LDPC) codes called expander codes. Our circuit can be understood as an open quantum system whose autonomous dynamics map straightforwardly onto the subroutines of an LDPC decoding scheme, with several attractive features: it can operate in the ultra-low power regime of photonics in which quantum fluctuations become significant, is robust to noise and component imperfections, achieves comparable performance to known iterative algorithms for this class of codes, and provides an instructive example of how nanophotonic cavity quantum electrodynamic components can enable useful new information technology even if the solid-state qubits on which they are based are heavily dephased and cannot support large-scale entanglement.

Dmitri S. Pavlichin; Hideo Mabuchi

2013-06-03T23:59:59.000Z

290

Universal programmable quantum circuit schemes to emulate an operator  

Science Conference Proceedings (OSTI)

Unlike fixed designs, programmable circuit designs support an infinite number of operators. The functionality of a programmable circuit can be altered by simply changing the angle values of the rotation gates in the circuit. Here, we present a new quantum circuit design technique resulting in two general programmable circuit schemes. The circuit schemes can be used to simulate any given operator by setting the angle values in the circuit. This provides a fixed circuit design whose angles are determined from the elements of the given matrix-which can be non-unitary-in an efficient way. We also give both the classical and quantum complexity analysis for these circuits and show that the circuits require a few classical computations. For the electronic structure simulation on a quantum computer, one has to perform the following steps: prepare the initial wave function of the system; present the evolution operator U=e{sup -iHt} for a given atomic and molecular Hamiltonian H in terms of quantum gates array and apply the phase estimation algorithm to find the energy eigenvalues. Thus, in the circuit model of quantum computing for quantum chemistry, a crucial step is presenting the evolution operator for the atomic and molecular Hamiltonians in terms of quantum gate arrays. Since the presented circuit designs are independent from the matrix decomposition techniques and the global optimization processes used to find quantum circuits for a given operator, high accuracy simulations can be done for the unitary propagators of molecular Hamiltonians on quantum computers. As an example, we show how to build the circuit design for the hydrogen molecule.

Daskin, Anmer; Grama, Ananth; Kollias, Giorgos [Department of Computer Science, Purdue University, West Lafayette, Indiana 47907 (United States); Kais, Sabre [Department of Chemistry, Department of Physics and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Qatar Environment and Energy Research Institute, Doha (Qatar)

2012-12-21T23:59:59.000Z

291

Mathematical modeling of irreversible dynamic deformation, micro...  

National Nuclear Security Administration (NNSA)

proceed in deformable solids under intensive dynamic loading, consist of mechanical, thermal and structural ones, which correlate themselves. The structural processes involve the...

292

Thermal Convection: Patterns, Evolution and Stability by M. Lappa  

E-Print Network (OSTI)

Review of the book "Thermal Convection: Patterns, Evolution and Stability" by M. Lappa. Invited by the journal Geophysical and Astrophysical Fluid Dynamics.

Simitev, R D

2010-01-01T23:59:59.000Z

293

Thermal conductivity of mass-graded graphene flakes  

E-Print Network (OSTI)

In this letter we investigate thermal conductions in mass-graded graphene flakes by nonequilibrium molecular dynamics simulations. It shows mass-graded graphene flakes reveal no thermal rectification effect in thermal conduction process. Dependences of thermal conductivity upon the heat fluxes and the mass gradients are studied. It is found that thermal conductivity would be dramatically decreased by increasing the mass gradients. We also discuss the influence of thermal curvatures and thermal expansions upon the thermal conduction process in mass-graded graphene flakes.

Cheh, Jigger

2011-01-01T23:59:59.000Z

294

Thermal Sciences The thermal sciences area involves the study of energy conversion and transmission, power  

E-Print Network (OSTI)

, power generation, the flow of liquids and gases, and the transfer of thermal energy (heat) by means, Thermodynamics, a sophomore spring course. This is followed by ME 608, Fluid Dynamics in the fall of the junior - Analytical Fluid Dynamics ME 709 - Computational Fluids Dynamics ME 712 - Waves in Fluids #12;

Chini, Gregory P.

295

On Thermally Forced Circulations over Heated Terrain  

Science Conference Proceedings (OSTI)

A combination of analytical and numerical models is used to gain insight into the dynamics of thermally forced circulations over diurnally heated terrain. Solutions are obtained for two-layer flows (representing the boundary layer and the ...

Daniel J. Kirshbaum

2013-06-01T23:59:59.000Z

296

Circuit breaker operation and potential failure modes during an earthquake  

Science Conference Proceedings (OSTI)

This study addresses the effect of a strong-motion earthquake on circuit breaker operation. It focuses on the loss of offsite power (LOSP) transient caused by a strong-motion earthquake at the Zion Nuclear Power Plant. This paper also describes the operator action necessary to prevent core melt if the above circuit breaker failure modes occur simultaneously on three 4.16 KV buses. Numerous circuit breakers important to plant safety, such as circuit breakers to diesel generators and engineered safety systems (ESS), must open and/or close during this transient while strong motion is occurring. Potential seismically-induced circuit-breaker failures modes were uncovered while the study was conducted. These failure modes include: circuit breaker fails to close; circuit breaker trips inadvertently; circuit breaker fails to reclose after trip. The causes of these failure modes include: Relay chatter causes the circuit breaker to trip; Relay chatter causes anti-pumping relays to seal-in which prevents automatic closure of circuit breakers; Load sequencer failures. The incorporation of these failure modes as well as other instrumentation and control failures into a limited scope seismic probabilistic risk assessment is also discussed in this paper.

Lambert, H.E.; Budnitz, R.J.

1987-01-01T23:59:59.000Z

297

Circuit for monitoring temperature of high-voltage equipment  

DOE Patents (OSTI)

This invention relates to an improved circuit for measuring temperature in a region at high electric potential and generating a read-out of the same in a region at lower potential. The circuit is specially designed to combine high sensitivity, stability, and accuracy. A major portion of the circuit situated in the high-potential region can take the form of an integrated circuit. The preferred form of the circuit includes an input section which is situated in the high-potential region and comprises a temperature-compensated thermocouple circuit for sensing temperature, an oscillator circuit for generating a train of ramp voltages whose rise time varies inversely with the thermocouple output, a comparator and switching circuit for converting the oscillator output to pulses whose frequency is proportional to the thermocouple output, and a light-emitting diode which is energized by these pulses. An optical coupling transmits the light pulses generated by the diode to an output section of the circuit, situated in a region at ground. The output section comprises means for converting the transmitted pulses to electrical pulses of corresponding frequency, means for amplifying the electrical pulses, and means for displaying the frequency of the same. The preferred embodiment of the overall circuit is designed so that the frequency of the output signal in hertz and tenths of hertz is equal to the sensed temperature in degrees and tenths of degrees.

Jacobs, Martin E. (Chillicothe, OH)

1976-01-01T23:59:59.000Z

298

High efficiency inverter and ballast circuits  

SciTech Connect

A high efficiency push-pull inverter circuit employing a pair of relatively high power switching transistors is described. The switching on and off of the transistors is precisely controlled to minimize power losses due to common-mode conduction or due to transient conditions that occur in the process of turning a transistor on or off. Two current feed-back transformers are employed in the transistor base drives; one being saturable for providing a positive feedback, and the other being non-saturable for providing a subtractive feedback.

Nilssen, O.K.

1984-02-07T23:59:59.000Z

299

Circuit Breaker Maintenance; Volume 1: Low-Voltage Circuit Breakers; Part 2: GE AK Models: Volume 1: Low-Voltage Circuit Breakers Pa rt 2: GE AK Models  

Science Conference Proceedings (OSTI)

This comprehensive guide will help utilities improve their maintenance of GE model AK circuit breakers. It consolidates industry guidelines, applicable standards, original equipment manufacturer recommendations, and hands-on experience relative to these circuit breakers. Ultimately, improved maintenance will increase reliability and reduce costs associated with corrective maintenance and equipment downtime.

1992-05-02T23:59:59.000Z

300

Thermal and flow design of helium-cooled reactors  

Science Conference Proceedings (OSTI)

This book continues the American Nuclear Society's series of monographs on nuclear science and technology. Chapters of the book include information on the first-generation gas-cooled reactors; HTGR reactor developments; reactor core heat transfer; mechanical problems related to the primary coolant circuit; HTGR design bases; core thermal design; gas turbines; process heat HTGR reactors; GCFR reactor thermal hydraulics; and gas cooling of fusion reactors.

Melese, G.; Katz, R.

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Circuit Breaker Maintenance: Volume 2: Medium Voltage Circuit Breakers; Part 3: Westinghouse Types DH and DHP  

Science Conference Proceedings (OSTI)

This comprehensive guide will help utilities enhance and optimize maintenance of Westinghouse DH and DHP circuit breakers. It consolidates industry guidelines, applicable standards, original equipment manufacturer recommendations, and hands-on experience relative to these breakers. Optimized maintenance will increase reliability and reduce costs associated with corrective maintenance and equipment downtime.

1994-02-02T23:59:59.000Z

302

High acetylcholine sets circuit dynamics for attention and encoding; Low acetylcholine sets dynamics for consolidation  

E-Print Network (OSTI)

. Depolarization of the cell to -58 mV with the intracellular injection of current (depol. current injection

Hasselmo, Michael

303

Interrogator system for identifying electrical circuits  

DOE Patents (OSTI)

A system for interrogating electrical leads to correctly ascertain the identity of equipment attached to remote ends of the leads. The system includes a source of a carrier signal generated in a controller/receiver to be sent over the leads and an identifier unit at the equipment. The identifier is activated by command of the carrier and uses a portion of the carrier to produce a supply voltage. Each identifier is uniquely programmed for a specific piece of equipment, and causes the impedance of the circuit to be modified whereby the carrier signal is modulated according to that program. The modulation can be amplitude, frequency or phase modulation. A demodulator in the controller/receiver analyzes the modulated carrier signal, and if a verified signal is recognized displays and/or records the information. This information can be utilized in a computer system to prepare a wiring diagram of the electrical equipment attached to specific leads. Specific circuit values are given for amplitude modulation, and the system is particularly described for use with thermocouples.

Jatko, William B. (10601 Rivermist La., Knoxville, TN 37922); McNeilly, David R. (Rte. 12, Box 538, Maryville, TN 37801)

1988-01-01T23:59:59.000Z

304

Interrogator system for identifying electrical circuits  

DOE Patents (OSTI)

A system for interrogating electrical leads to correctly ascertain the identity of equipment attached to remote ends of the leads is disclosed. The system includes a source of a carrier signal generated in a controller/receiver to be sent over the leads and an identifier unit at the equipment. The identifier is activated by command of the carrier and uses a portion of the carrier to produce a supply voltage. Each identifier is uniquely programmed for a specific piece of equipment, and causes the impedance of the circuit to be modified whereby the carrier signal is modulated according to that program. The modulation can be amplitude, frequency or phase modulation. A demodulator in the controller/receiver analyzes the modulated carrier signal, and if a verified signal is recognized displays and/or records the information. This information can be utilized in a computer system to prepare a wiring diagram of the electrical equipment attached to specific leads. Specific circuit values are given for amplitude modulation, and the system is particularly described for use with thermocouples. 6 figs.

Jatko, W.B.; McNeilly, D.R.

1988-04-12T23:59:59.000Z

305

Generating Single Microwave Photons in a Circuit  

E-Print Network (OSTI)

Electromagnetic signals in circuits consist of discrete photons, though conventional voltage sources can only generate classical fields with a coherent superposition of many different photon numbers. While these classical signals can control and measure bits in a quantum computer (qubits), single photons can carry quantum information, enabling non-local quantum interactions, an important resource for scalable quantum computing. Here, we demonstrate an on-chip single photon source in a circuit quantum electrodynamics (QED) architecture, with a microwave transmission line cavity that collects the spontaneous emission of a single superconducting qubit with high efficiency. The photon source is triggered by a qubit rotation, as a photon is generated only when the qubit is excited. Tomography of both qubit and fluorescence photon shows that arbitrary qubit states can be mapped onto the photon state, demonstrating an ability to convert a stationary qubit into a flying qubit. Both the average power and voltage of the photon source are characterized to verify performance of the system. This single photon source is an important addition to a rapidly growing toolbox for quantum optics on a chip.

A. A. Houck; D. I. Schuster; J. M. Gambetta; J. A. Schreier; B. R. Johnson; J. M. Chow; J. Majer; L. Frunzio; M. H. Devoret; S. M. Girvin; R. J. Schoelkopf

2007-02-27T23:59:59.000Z

306

Hydraulic actuator for an electric circuit breaker  

DOE Patents (OSTI)

This actuator comprises a fluid motor having a piston, a breaker-opening space at one side of the piston, and a breaker-closing space at its opposite side. An accumulator freely communicates with the breaker-opening space for supplying pressurized fluid thereto during a circuit breaker opening operation. The breaker-opening space and the breaker-closing space are connected by an impeded flow passage. A pilot valve opens to allow the pressurized liquid in the breaker-closing space to flow to a back chamber of a normally closed main valve to cause the main valve to be opened during a circuit breaker opening operation to release the pressurized liquid from the breaker-closing space. An impeded passage affords communication between the back chamber and a sump located on the opposite side of the main valve from the back chamber. The pilot valve and impeded passage allow rapid opening of the main valve with pressurized liquid from the breaker closing side of the piston. 3 figs.

Imam, I.

1983-05-17T23:59:59.000Z

307

Hydraulic actuator for an electric circuit breaker  

DOE Patents (OSTI)

This actuator comprises a fluid motor having a piston, a breaker-opening space at one side of the piston, and a breaker-closing space at its opposite side. An accumulator freely communicates with the breaker-opening space for supplying pressurized fluid thereto during a circuit breaker opening operation. The breaker-opening space and the breaker-closing space are connected by an impeded flow passage. A pilot valve opens to allow the pressurized liquid in the breaker-closing space to flow to a back chamber of a normally closed main valve to cause the main valve to be opened during a circuit breaker opening operation to release the pressurized liquid from the breaker-closing space. An impeded passage affords communication between the back chamber and a sump located on the opposite side of the main valve from the back chamber. The pilot valve and impeded passage allow rapid opening of the main valve with pressurized liquid from the breaker closing side of the piston.

Imam, Imdad (Colonie, NY)

1983-01-01T23:59:59.000Z

308

Memristor-based Circuits for Performing Basic Arithmetic Operations  

E-Print Network (OSTI)

In almost all of the currently working circuits, especially in analog circuits implementing signal processing applications, basic arithmetic operations such as multiplication, addition, subtraction and division are performed on values which are represented by voltages or currents. However, in this paper, we propose a new and simple method for performing analog arithmetic operations which in this scheme, signals are represented and stored through a memristance of the newly found circuit element, i.e. memristor, instead of voltage or current. Some of these operators such as divider and multiplier are much simpler and faster than their equivalent voltage-based circuits and they require less chip area. In addition, a new circuit is designed for programming the memristance of the memristor with predetermined analog value. Presented simulation results demonstrate the effectiveness and the accuracy of the proposed circuits.

Merrikh-Bayat, Farnood

2010-01-01T23:59:59.000Z

309

Explicit transient thermal simulation of liquid-cooled 3D ICs  

Science Conference Proceedings (OSTI)

The high heat flux and compact structure of three-dimensional circuits (3D ICs) make conventional air-cooled devices more subsceptible to overheating. Liquid cooling is an alternative that can improve heat dissipation, and reduce thermal issues. Fast ... Keywords: 3D ICs, compact thermal model, finite difference method, liquid-cooling

Alain Fourmigue, Giovanni Beltrame, Gabriela Nicolescu

2013-03-01T23:59:59.000Z

310

Field Guide: Compressors for High-Voltage Circuit Breakers  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breakers have multiple components that must operate in concert in order for the breaker to perform properly. If one component, such as the air or hydraulic system, does not operate correctly, the circuit breaker may misoperate or fail, possibly resulting in equipment damage or an outageboth expensive consequences. To help utilities prevent such undesirable events, this field gu...

2010-12-22T23:59:59.000Z

311

Field Guide: Compressors for High-Voltage Circuit Breakers  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breakers have multiple components that must operate in concert in order for the breaker to perform properly. If one component, such as the air or hydraulic system, does not operate correctly, the circuit breaker may misoperate or fail, possibly resulting in equipment damage or an outage—both expensive consequences. To help ...

2012-12-14T23:59:59.000Z

312

A Power-efficient Radio Frequency Energy-harvesting Circuit .  

E-Print Network (OSTI)

??This work aims to demonstrate the design and simulation of a Radio Frequency (RF) energy-harvesting circuit, from receiving antenna to the point of charge collection.… (more)

Khoury, Philip

2013-01-01T23:59:59.000Z

313

DSOPilot project Automatic receipt of short circuiting indicators...  

Open Energy Info (EERE)

Project Name DSOPilot project Automatic receipt of short circuiting indicators Country Denmark Coordinates 56.26392, 9.501785 Loading map... "minzoom":false,"mappingservice":"...

314

Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical ...  

Science Conference Proceedings (OSTI)

Presentation Title, Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical .... Selective Separations of Gold and Contaminants from Various Gold and ...

315

Hydrocyclone Classification Modeling for Gold Ore Grinding Circuit ...  

Science Conference Proceedings (OSTI)

Grinding is achieved in closed circuits where hydrocyclones are used to .... Selective Separations of Gold and Contaminants from Various Gold and Silver ...

316

Driver Circuit for White LED Lamps with TRIAC Dimming Control.  

E-Print Network (OSTI)

??An efficient Light Emitting Diode (LED) lamp driver circuit is proposed for retrofitting the conventionally used incandescent lamps with existing TRIAC dimmer. The dimming feature… (more)

Weng, Szu-Jung

2012-01-01T23:59:59.000Z

317

High speed, long distance, data transmission multiplexing circuit  

DOE Patents (OSTI)

A high speed serial data transmission multiplexing circuit, which is operable to accurately transmit data over long distances (up to 3 Km), and to multiplex, select and continuously display real time analog signals in a bandwidth from DC to 100 Khz. The circuit is made fault tolerant by use of a programmable flywheel algorithm, which enables the circuit to tolerate one transmission error before losing synchronization of the transmitted frames of data. A method of encoding and framing captured and transmitted data is used which has a low overhead and prevents some particular transmitted data patterns from locking an included detector/decoder circuit.

Mariotti, Razvan (Boulder, CO)

1991-01-01T23:59:59.000Z

318

A high speed, long distance, data transmission multiplexing circuit  

DOE Patents (OSTI)

A high speed serial data transmission multiplexing circuit, which is operable to accurately transmit data over long distances (up to 3 Km), and to multiplex, select and continuously display real time analog signals in a bandwidth from DC to 100Khz. The circuit is made fault tolerant by use of a programmable flywheel algorithm, which enables the circuit to tolerate one transmission error before losing synchronization of the transmitted frames of data. A method of encoding and framing captured and transmitted data is used which has a low overhead and prevents some particular transmitted data patterns from locking an included detector/decoder circuit. 9 figs.

Mariotti, R.

1990-01-30T23:59:59.000Z

319

Automatic ranging circuit for a digital panel meter  

DOE Patents (OSTI)

This invention relates to a range changing circuit that operates in conjunction with a digital panel meter of fixed sensitivity. The circuit decodes the output of the panel meter and uses that information to change the gain of an input amplifier to the panel meter in order to insure that the maximum number of significant figures is always displayed in the meter. The circuit monitors five conditions in the meter and responds to any of four combinations of these conditions by means of logic elements to carry out the function of the circuit.

Mueller, Theodore R. (Oak Ridge, TN); Ross, Harley H. (Oak Ridge, TN)

1976-01-01T23:59:59.000Z

320

Phase controlled rectifier circuit for rapidly charging batteries  

SciTech Connect

An improved battery charger circuit for rapidly charging a battery by increasing the rate of battery charge acceptance through periodic battery discharge during the charging process includes a pair of first and second controlled rectifier circuits coupled to an ac source and adapted for coupling to a battery. The first controlled rectifier circuit is rendered conductive during the charging intervals to supply the battery with charge current from the ac source. The second controlled rectifier circuit is rendered conductive during battery discharge intervals to discharge the battery in a substantially lossless manner by conducting battery discharge current through the ac source, thus realizing a highly efficient battery charger.

Steigerwald, R. L.

1981-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Laser Micromachining of Active and Passive Photonic Integrated Circuits  

E-Print Network (OSTI)

This thesis describes the development of advanced laser resonators and applications of laserinduced micromachining for photonic circuit fabrication. Two major advantages of laserinduced micromachining are direct patterning ...

Cho, Seong-Ho

2006-06-28T23:59:59.000Z

322

Safety and performance enhancement circuit for primary explosive detonators  

DOE Patents (OSTI)

A safety and performance enhancement arrangement for primary explosive detonators. This arrangement involves a circuit containing an energy storage capacitor and preset self-trigger to protect the primary explosive detonator from electrostatic discharge (ESD). The circuit does not discharge into the detonator until a sufficient level of charge is acquired on the capacitor. The circuit parameters are designed so that normal ESD environments cannot charge the protection circuit to a level to achieve discharge. When functioned, the performance of the detonator is also improved because of the close coupling of the stored energy.

Davis, Ronald W. (Tracy, CA)

2006-04-04T23:59:59.000Z

323

6.012 Microelectronic Devices and Circuits, Fall 2003  

E-Print Network (OSTI)

Modeling of microelectronic devices, and basic microelectronic circuit analysis and design. Physical electronics of semiconductor junction and MOS devices. Relation of electrical behavior to internal physical processes; ...

Fonstad, Clifton G.

324

Surge Protection in Low-Voltage AC Power Circuits  

Science Conference Proceedings (OSTI)

Surge Protection in Low-Voltage AC Power Circuits: An 8-part Anthology ... converting old and yellowing papers into 21st Century electronic files, and ...

2013-05-20T23:59:59.000Z

325

Thermal indicator for wells  

DOE Patents (OSTI)

Minute durable plate-like thermal indicators are employed for precision measuring static and dynamic temperatures of well drilling fluids. The indicators are small enough and sufficiently durable to be circulated in the well with drilling fluids during the drilling operation. The indicators include a heat resistant indicating layer, a coacting meltable solid component and a retainer body which serves to unitize each indicator and which may carry permanent indicator identifying indicia. The indicators are recovered from the drilling fluid at ground level by known techniques.

Gaven, Jr., Joseph V. (Oakton, VA); Bak, Chan S. (Newbury Park, CA)

1983-01-01T23:59:59.000Z

326

Manipulation of Thermal Phonons  

E-Print Network (OSTI)

Developing materials that can conduct electricity easily, but block the motion of phonons is necessary in the applications of thermoelectric devices, which can generate electricity from temperature differences. In converse, a key requirement as chips get faster is to obtain better ways to dissipate heat. Controlling heat transfer in these crystalline materials devices — such as silicon — is important. The heat is actually the motion or vibration of atoms known as phonons. Finding ways to manipulate the behavior of phonons is crucial for both energy applications and the cooling of integrated circuits. A novel class of artificially periodic structured materials — phononic crystals — might make manipulation of thermal phonons possible. In many fields of physical sciences and engineering, acoustic wave propagation in solids attracts many researchers. Wave propagation phenomena can be analyzed by mathematically solving the acoustic wave equation. However, wave propagation in inhomogeneous media with various geometric structures is too complex to find an exact solution. Hence, the Finite Difference Time Domain method is developed to investigate these complicated problems. In this work, the Finite-Difference Time-Domain formula is derived from acoustic wave equations based on the Taylor’s expansion. The numerical dispersion and stability problems are analyzed. In addition, the convergence conditions of numerical acoustic wave are stated. Based on the periodicity of phononic crystal, the Bloch’s theorem is applied to fulfill the periodic boundary condition of the FDTD method. Then a wide-band input signal is used to excite various acoustic waves with different frequencies. In the beginning of the calculation process, the wave vector is chosen and fixed. By means of recording the displacement field and taking the Fourier transformation, we can obtain the eigenmodes from the resonance peaks of the spectrum and draw the dispersion relation curve of acoustic waves. With the large investment in silicon nanofabrication techniques, this makes tungsten/silicon phononic crystal a particularly attractive platform for manipulating thermal phonons. Phononic crystal makes use of the fundamental properties of waves to create band gap over which there can be no propagation of acoustic waves in the crystal. This crystal can be applied to deterministically manipulate the phonon dispersion curve affected by different crystal structures and to modify the phonon thermal conductivity accordingly. We can expect this unique metamaterial is a promising route to creating unprecedented thermal properties for highly-efficient energy harvesting and thermoelectric cooling.

Hsu, Chung-Hao

2013-05-01T23:59:59.000Z

327

Thermal Properties  

Science Conference Proceedings (OSTI)

Table 12   Thermal conductivities of polymers and other materials...40,000 2.8 Aluminum 24,000 1.7 Steel 5000 0.35 Granite 350 0.02 Crown glass (75 wt% silica) 90 0.006 Source: Ref 4...

328

Interconnect Coupling Noise in CMOS VLSI Circuits  

E-Print Network (OSTI)

Interconnect between a CMOS driver and re- ceiver can be modeled as a 1ossy transmission line in high speed CMOS VLSI circuits as transition times become comparable to or less than the time of flight delay of the signal through the low resistivity interconnect. In this paper, closed form expressions for the coupling noise between adjacent interconnect are presented to estimate the coupling noise voltage on a quiet line. These expressions are based on an assumption that the interconnections are loosely coupled, where the effect of the coupling noise on the waveform of the active line is small and can be ne- glected. It is demonstrated that the output impedance of the CMOS driver should preferably be comparable to the interconnect impedance in order to reduce the propagation delay of the CMOS driver stage.

Kevin T. Tang; Eby G. Friedman

1999-01-01T23:59:59.000Z

329

Theory of degenerate three-wave mixing using circuit QED in solid-state circuits  

Science Conference Proceedings (OSTI)

We study the theory of degenerate three-wave mixing and the generation of squeezed microwaves using circuit quantum electrodynamics in solid state circuits. The Hamiltonian for degenerate three-wave mixing, which seemed to be given phenomenologically in quantum optics, is derived by quantum mechanical calculations. The nonlinear medium needed in three-wave mixing is composed of a series of superconducting charge qubits which are located inside two superconducting transmission-line resonators. Here, the multiqubit ensemble is present to enhance the effective coupling constant between the two modes in the transmission-line resonators. In the squeezing process, the qubits are kept in their ground states so that their decoherence does not corrupt the squeezing. The main obstacle preventing a large squeezing efficiency is the decay rate of the transmission-line resonator.

Cao, Ye [Key Laboratory of Atomic and Molecular Nanosciences and Department of Physics, Tsinghua University, Beijing 100084 (China); Huo, Wen Yi [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Ai, Qing [Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China); Long, Gui Lu [Key Laboratory of Atomic and Molecular Nanosciences and Department of Physics, Tsinghua University, Beijing 100084 (China); Tsinghua National Laboratory For Information Science and Technology, Beijing 100084 (China)

2011-11-15T23:59:59.000Z

330

Rapid Synthesis and Simulation of Computational Circuits in an MPPA  

Science Conference Proceedings (OSTI)

A computational circuit is custom-designed hardware which promises to offer maximum speedup of computationally intensive software algorithms. However, the practical needs to manage development cost and many low-level physical design details ... Keywords: Circuit CAD, FPGA-based design, Field programmable gate arrays, Logic CAD, Software architecture, Software tools, Spatial computing

David Grant; Graeme Smecher; Guy G. Lemieux; Rosemary Francis

2012-04-01T23:59:59.000Z

331

Design investigation of nanoelectronic circuits using crossbar-based nanoarchitectures  

Science Conference Proceedings (OSTI)

Nanowire crossbar is an efficient nanoscale architecture which can be used for logic circuit design. In this work, we study and compare different crossbar nanoarchitectures and their application in logic circuit implementation. To evaluate the performance ... Keywords: Crossbar arrays, Molecular electronics, Nanoelectronics, Nanotubes, Nanowire crossbar architectures

Morteza Gholipour; Nasser Masoumi

2013-03-01T23:59:59.000Z

332

A DC CIRCUIT BREAKER FOR AN ELECTRIC VEHICLE BATTERY PACK  

E-Print Network (OSTI)

A DC CIRCUIT BREAKER FOR AN ELECTRIC VEHICLE BATTERY PACK Geoff Walker Dept of Computer Science vehicle battery packs require DC circuit breakers for safety. These must break thousands of Amps DC at hundreds of Volts. The Sunshark solar racing car has a 140V 17Ahr battery box which needs such a breaker

Walker, Geoff

333

Pulse drive and capacitance measurement circuit for MEMS electrostatic actuators  

Science Conference Proceedings (OSTI)

In this paper we present an electronic circuit for position or capacitance estimation of MEMS electrostatic actuators based on a switched capacitor technique. The circuit uses a capacitive divider configuration composed by a fixed capacitor and the variable ... Keywords: Capacitance, Capacitive divider, Distance estimation, MEMS, Pulsed digital oscillators

Daniel Fernández; Jordi Madrenas; Manuel Domínguez; Joan Pons; Jordi Ricart

2008-12-01T23:59:59.000Z

334

Variability aware SVM macromodel based design centering of analog circuits  

Science Conference Proceedings (OSTI)

Design centering is the term used for a procedure of obtaining enhanced parametric yield of a circuit despite the variations in device and design parameters. The process variability in nanometer regimes manifest into variations in these devices and design ... Keywords: Analog circuit sizing, Design centering, Genetic algorithm, Macromodels, Support vector machine, Yield

D. Boolchandani; Lokesh Garg; Sapna Khandelwal; Vineet Sahula

2012-10-01T23:59:59.000Z

335

Power Circuit Breaker Component and Sub-System Degradation Modes  

Science Conference Proceedings (OSTI)

The work described in this technical update is part of an ongoing EPRI effort to improve high voltage circuit breaker (HVCB) life management. It presents initial results of investigations of issues concerning transmission-class circuit breaker pump and compressor maintenance, and possible improvements in materials and practices that could improve maintenance effectiveness.

2010-12-23T23:59:59.000Z

336

Stochastic computational models for accurate reliability evaluation of logic circuits  

Science Conference Proceedings (OSTI)

As reliability becomes a major concern with the continuous scaling of CMOS technology, several computational methodologies have been developed for the reliability evaluation of logic circuits. Previous accurate analytical approaches, however, have a ... Keywords: fault tolerance, logic circuits, reliability evaluation, stochastic computation, stochastic computational model

Hao Chen; Jie Han

2010-05-01T23:59:59.000Z

337

Molded Case Circuit Breaker Application and Maintenance Guide: Revision 2  

Science Conference Proceedings (OSTI)

Molded case circuit breakers (MCCBs) provide power and circuit protection in nuclear plant electrical distribution systems. Their proper operation is essential to the safe and reliable operation of such systems. This guide applies to both nuclear and non-nuclear power generating facilities and can help improve the maintenance and reliability of MCCBs.

2004-12-22T23:59:59.000Z

338

Printed Circuit Board Maintenance, Repair, and Testing Guide  

Science Conference Proceedings (OSTI)

Printed circuit boards (PCBs) are an assembly of electronic and electro-mechanical components, such as relays and switches. The printed circuit (PC) board assembly provides multiple functions based on its application and intended service. It is an integral part of many instruments and/or instrumentation systems.

2003-10-30T23:59:59.000Z

339

A compiled-code hardware accelerator for circuit simulation  

Science Conference Proceedings (OSTI)

Describes the application of compiled-code techniques to the design of a hardware accelerator for circuit simulation, offering a speedup by a factor of up to 4400 compared with a software circuit simulator running on a Sun-3/60 workstation. The preprocessing ...

D. M. Lewis

2006-11-01T23:59:59.000Z

340

Short-Circuit Modeling of a Wind Power Plant: Preprint  

DOE Green Energy (OSTI)

This paper investigates the short-circuit behavior of a WPP for different types of wind turbines. The short-circuit behavior will be presented. Both the simplified models and detailed models are used in the simulations and both symmetrical faults and unsymmetrical faults are discussed.

Muljadi, E.; Gevorgian, V.

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

High Resolution PV Power Modeling for Distribution Circuit Analysis  

DOE Green Energy (OSTI)

NREL has contracted with Clean Power Research to provide 1-minute simulation datasets of PV systems located at three high penetration distribution feeders in the service territory of Southern California Edison (SCE): Porterville, Palmdale, and Fontana, California. The resulting PV simulations will be used to separately model the electrical circuits to determine the impacts of PV on circuit operations.

Norris, B. L.; Dise, J. H.

2013-09-01T23:59:59.000Z

342

Determination of equivalent circuit for PVDF shock-pressure gauges  

SciTech Connect

Broadband impedance measurements of a PVDF shock-pressure gauge are used to build an equivalent circuit for the gauge. The essential components are a gauge capacitance and a low-loss transmission line. Component features are consistent with the physical characteristics. With knowledge of this circuit, troublesome oscillations can be anticipated and prevented.

Kotulski, J.D.; Anderson, M.U.; Brock, B.C.; Gomez, J.; Graham, R.A.; Vittitoe, C.N.

1993-07-01T23:59:59.000Z

343

Determination of equivalent circuit for PVDF shock-pressure gauges  

SciTech Connect

Broadband impedance measurements of a PVDF shock-pressure gauge are used to build an equivalent circuit for the gauge. The essential components are a gauge capacitance and a low-loss transmission line. Component features are consistent with the physical characteristics. With knowledge of this circuit, troublesome oscillations can be anticipated and prevented. [copyright]American Institute of Physics

Kotulski, J.D.; Anderson, M.U.; Brock, B.C.; Gomez, J.; Graham, R.A.; Vittitoe, C.N. (Sandia National Laboratories, Albuquerque, New Mexico 87185-5800 (United States))

1994-07-10T23:59:59.000Z

344

ANACONDA: Robust Synthesis of Analog Circuits Via Stochastic Pattern Search  

E-Print Network (OSTI)

Analog synthesis tools have traditionally traded quality for speed, substituting simplified circuit evaluation methods for full simulation in order to accelerate the numerical search for solution candidates. In this paper we develop a new numerical search algorithm efficient enough to allow full circuit simulation of each circuit candidate, and robust enough to find good solutions for difficult circuits. Comparison of synthesized circuits against manual industrial designs demonstrates the utility of the approach. I. INTRODUCTION A significant number of system-on-chip (SoC) designs are mixed-signal designs because of the need to interface a digital computational core to the real world. The rapidly increasing scale of SoC designs is stressing existing tools and methodologies; nevertheless the digital portions of these designs rely heavily on synthesis tools. This is not true for the analog portions, which are still routinely designed by hand. This lack of automation has always been a p...

Rodney Phelps; Michael Krasnicki; Rob A. Rutenbar; L. Richard Carley; James R. Hellums

1999-01-01T23:59:59.000Z

345

AQUIFER THERMAL ENERGY STORAGE  

E-Print Network (OSTI)

aquifers for thermal energy storage. Problems outlined aboveModeling of Thermal Energy Storage in Aquifers," Proceed-ings of Aquifer Thermal Energy Storage Workshop, Lawrence

Tsang, C.-F.

2011-01-01T23:59:59.000Z

346

AQUIFER THERMAL ENERGY STORAGE  

E-Print Network (OSTI)

using aquifers for thermal energy storage. Problems outlinedmatical Modeling of Thermal Energy Storage in Aquifers,"Proceed- ings of Aquifer Thermal Energy Storage Workshop,

Tsang, C.-F.

2011-01-01T23:59:59.000Z

347

Journal of Asian Electric Vehicles, Volume 8, Number 1, June 2010 Simplified Thermal Model of PM Motors in Hybrid Vehicle Applications Taking  

E-Print Network (OSTI)

, thermal circuit, heat processes, pulse-width-modulated 1. INTRODUCTION Permanent magnet (PM) motors components in the system. Thermal studies on electric motors often approach the subject using FEA. Although to a cylinder. Reference [Hsu et al., 2005] shows that the thermal conductivity of Toyota Prius traction motor

Mi, Chunting "Chris"

348

Printable, flexible and stretchable diamond for thermal management  

DOE Patents (OSTI)

Various heat-sinked components and methods of making heat-sinked components are disclosed where diamond in thermal contact with one or more heat-generating components are capable of dissipating heat, thereby providing thermally-regulated components. Thermally conductive diamond is provided in patterns capable of providing efficient and maximum heat transfer away from components that may be susceptible to damage by elevated temperatures. The devices and methods are used to cool flexible electronics, integrated circuits and other complex electronics that tend to generate significant heat. Also provided are methods of making printable diamond patterns that can be used in a range of devices and device components.

Rogers, John A; Kim, Tae Ho; Choi, Won Mook; Kim, Dae Hyeong; Meitl, Matthew; Menard, Etienne; Carlisle, John

2013-06-25T23:59:59.000Z

349

DRMA: dynamically reconfigurable MPSoC architecture  

Science Conference Proceedings (OSTI)

Embedded systems are ubiquitous and are deployed in a large range of applications. Designing and fabricating Integrated Circuits (ICs) targeting such different range of applications is expensive. Designers seek flexible processors which efficiently execute ... Keywords: dynamical reconfiguration, embedded system, mpsoc, multiprocessor, parallelism, word size variation

Lawrance Zhang; Jude Angelo Ambrose; Jorgen Peddersen; Sri Parameswaran; Roshan Ragel; Swarnalatha Radhakrishnan; Kewal K. Saluja

2013-05-01T23:59:59.000Z

350

THE THREE DIMENSIONAL THERMAL HYDRAULIC CODE BAGIRA.  

SciTech Connect

BAGIRA - a thermal-hydraulic program complex was primarily developed for using it in nuclear power plant simulator models, but is also used as a best-estimate analytical tool for modeling two-phase mixture flows. The code models allow consideration of phase transients and the treatment of the hydrodynamic behavior of boiling and pressurized water reactor circuits. It provides the capability to explicitly model three-dimensional flow regimes in various regions of the primary and secondary circuits such as, the mixing regions, circular downcomer, pressurizer, reactor core, main primary loops, the steam generators, the separator-reheaters. In addition, it is coupled to a severe-accident module allowing the analysis of core degradation and fuel damage behavior. Section II will present the theoretical basis for development and selected results are presented in Section III. The primary use for the code complex is to realistically model reactor core behavior in power plant simulators providing enhanced training tools for plant operators.

KALINICHENKO,S.D.; KOHUT,P.; KROSHILIN,A.E.; KROSHILIN,V.E.; SMIRNOV,A.V.

2003-05-04T23:59:59.000Z

351

EI7154_Projektpraktikum_Design_of_Molecular_Circuits.xls Allgemeine Daten  

E-Print Network (OSTI)

EI7154_Projektpraktikum_Design_of_Molecular_Circuits.xls Allgemeine Daten: Modulnummer: EI7154 Modulbezeichnung (dt.): Projektpraktikum Design of Molecular Circuits Modulbezeichnung (en.): Projektpraktikum Design of Molecular Circuits Modulniveau: MSc Kürzel: Untertitel: Semesterdauer: 1 Semester Häufigkeit

Kuehnlenz, Kolja

352

Power saving regulated light emitting diode circuit  

SciTech Connect

A power saving regulated light source circuit, comprising a light emitting diode (LED), a direct current source and a switching transistor connected in series with the LED, a control voltage producing resistor connected in series with the LED to produce a control voltage corresponding to the current through the LED, a storage capacitor connected in parallel with the series combination of the LED and the resistor, a comparator having its output connected to the input of the transistor, the comparator having a reference input and a control input, a stabilized biasing source for supplying a stabilized reference voltage to the reference input, the control input of the comparator being connected to the control voltage producing resistor, the comparator having a high output state when the reference voltage exceeds the control voltage while having a low output state when the control voltage exceeds the reference voltage, the transistor being conductive in response to the high state while being nonconductive in response to the low state, the transistor when conductive being effective to charge the capacitor and to increase the control voltage, whereby the comparator is cycled between the high and low output states while the transistor is cycled between conductive and nonconductive states.

Haville, G. D.

1985-03-12T23:59:59.000Z

353

Photonic circuits for generating modal, spectral, and polarization entanglement  

E-Print Network (OSTI)

We consider the design of photonic circuits that make use of Ti:LiNbO$_{3}$ diffused channel waveguides for generating photons with various combinations of modal, spectral, and polarization entanglement. Down-converted photon pairs are generated via spontaneous optical parametric down-conversion (SPDC) in a two-mode waveguide. We study a class of photonic circuits comprising: 1) a nonlinear periodically poled two-mode waveguide structure, 2) a set of single-mode and two-mode waveguide-based couplers arranged in such a way that they suitably separate the three photons comprising the SPDC process, and, for some applications, 3) a holographic Bragg grating that acts as a dichroic reflector. The first circuit produces frequency-degenerate down-converted photons, each with even spatial parity, in two separate single-mode waveguides. Changing the parameters of the elements allows this same circuit to produce two nondegenerate down-converted photons that are entangled in frequency or simultaneously entangled in frequency and polarization. The second photonic circuit is designed to produce modal entanglement by distinguishing the photons on the basis of their frequencies. A modified version of this circuit can be used to generate photons that are doubly entangled in mode number and polarization. The third photonic circuit is designed to manage dispersion by converting modal, spectral, and polarization entanglement into path entanglement.

Mohammed F. Saleh; Giovanni Di Giuseppe; Bahaa E. A. Saleh; Malvin Carl Teich

2010-07-19T23:59:59.000Z

354

Prediction of Power Requirements for High-Speed Circuits  

E-Print Network (OSTI)

. Modern VLSI design methodologies and manufacturing technologies are making circuits increasingly fast. The quest for higher circuit performance and integration density stems from fields such as the telecommunication one where high speed and capability of dealing with large data sets is mandatory. The design of high-speed circuits is a challenging task, and can be carried out only if designers can exploit suitable CAD tools. Among the several aspects of high-speed circuit design, controlling power consumption is today a major issue for ensuring that circuits can operate at full speed without damages. In particular, tools for fast and accurate estimation of power consumption of highspeed circuits are required. In this paper we focus on the problem of predicting the maximum power consumption of sequential circuits. We formulate the problem as a constrained optimization problem, and solve it resorting to an evolutionary algorithm. Moreover, we empirically assess the effectiveness of our problem formulation with respect to the classical unconstrained formulation. Finally, we report experimental results assessing the effectiveness of the prototypical tool we implemented. 1.

Corno Rebaudengo Sonza; F. Corno; M. Rebaudengo; M. Sonza Reorda; G. Squillero; M. Violante

2000-01-01T23:59:59.000Z

355

Battery disconnect sensing circuit for battery charging systems  

SciTech Connect

This patent describes a battery disconnect sensing circuit for battery charging systems which have a pair of cables adapted to be connected to a battery to charge it. The sensing circuit contains a first R-C circuit adapted to connect across the cables and a second R-C circuit adapted to connect across the cables. The time constant of the first R-C circuit is substantially greater than that of the second R-C circuit. Also means connected to the RC circuits produced a momentary control signal in response to disconnection of the cables from a battery being charged. Included in a battery charging system is a source of charging current whose voltage output is controlled at a predetermined value when connected to a battery. It increases to a higher value when disconnected from the battery. Controller means connected with the source activate the battery charging system automatically in response to electrical connection of the battery. The improvement consists of: means for momentarily effecting reversal of the higher voltage value, and battery disconnect sensing means connected the charging source and to the controller means for sensing the reversed higher voltage upon disconnection of the battery charger system from the battery and for responding by automatically deactivating the battery charging system.

Dattilo, D.P.

1986-01-28T23:59:59.000Z

356

JETC: Joint Energy, Thermal and Cooling Management for CPU and Memory  

E-Print Network (OSTI)

JETC: Joint Energy, Thermal and Cooling Management for CPU and Memory Subsystems in Servers Raid Ayoub, Rajib Nath, Tajana Rosing, UCSD 2052.002 Observation Model of Thermal Coupling Between CPU: No Memory Management NCM: No CPU Migration DLB: Dynamic Load Balancing DTM-CM+PI: Dynamic Thermal Management

Simunic, Tajana

357

Measurements of the effects of smoke on active circuits  

SciTech Connect

Smoke has long been recognized as the most common source of fire damage to electrical equipment; however, most failures have been analyzed after the fire was out and the smoke vented. The effects caused while the smoke is still in the air have not been explored. Such effects have implications for new digital equipment being installed in nuclear reactors. The US Nuclear Regulatory Commission is sponsoring work to determine the impact of smoke on digital instrumentation and control. As part of this program, Sandia National Laboratories has tested simple active circuits to determine how smoke affects them. These tests included the study of three possible failure modes on a functional board: (1) circuit bridging, (2) corrosion (metal loss), and (3) induction of stray capacitance. The performance of nine different circuits was measured continuously on bare and conformally coated boards during smoke exposures lasting 1 hour each and continued for 24 hours after the exposure started. The circuit that was most affected by smoke (100% change in measured values) was the one most sensitive to circuit bridging. Its high impedance (50 Mohm) was shorted during the exposure, but in some cases recovered after the smoke was vented. The other two failure modes, corrosion and induced stray capacitance, caused little change in the function of the circuits. The smoke permanently increased resistance of the circuit tested for corrosion, implying that the contacts were corroded. However, the change was very small (< 2%). The stray capacitance test circuit showed very little change after a smoke exposure in either the short or long term. The results of the tests suggest that conformal coatings and type of circuit are major considerations when designing digital circuitry to be used in critical control systems.

Tanaka, T.J.

1998-01-01T23:59:59.000Z

358

Measurements of the Effects of Smoke on Active Circuits  

Science Conference Proceedings (OSTI)

Smoke has long been recognized as the most common source of fire damage to electrical equipment; however, most failures have been analyzed after the fire was out and the smoke vented. The effects caused while the smoke is still in the air have not been explored. Such effects have implications for new digital equipment being installed in nuclear reactors. The U.S. Nuclear Regulatory Commission is sponsoring work to determine the impact of smoke on digital instrumentation and control. As part of this program, Sandia National Laboratories has tested simple active circuits to determine how smoke affects them. These tests included the study of three possible failure modes on a functional board: (1) circuit bridging, (2) corrosion (metal loss), and (3) induction of stray capacitance. The performance of nine different circuits was measured continuously on bare and conformably coated boards during smoke exposures lasting 1 hour each and continued for 24 hours after the exposure started. The circuit that was most affected by smoke (100% change in measured values) was the one most sensitive to circuit bridging. Its high impedance (50 M{Omega}) was shorted during the exposure, but in some cases recovered after the smoke was vented. The other two failure modes, corrosion and induced stray capacitance, caused little change in the function of the circuits. The smoke permanently increased resistance of the circuit tested for corrosion, implying that the cent acts were corroded. However, the change was very small (< 2%). The stray-capacitance test circuit showed very little change after a smoke exposure in either the short or long term. The results of the tests suggest that conformal coatings and type of circuit are major considerations when designing digital circuitry to be used in critical control systems.

Tanaka, T.J.

1999-02-09T23:59:59.000Z

359

Thermal energy from a biogas engine/generator system  

SciTech Connect

A biogas fueled engine/generator equipped with heat recovery apparatus and thermal storage is described. The thermal energy is used to fuel a liquid fuel plant. Heat recovery is quantified and the static and dynamic performance of the thermal storage is described. At 1260 rpm the engine/generator produces 21 kW of electric power and 2500 kJ/min of thermal energy.

Stahl, T.; Fischer, J.R.; Harris, F.D.

1982-12-01T23:59:59.000Z

360

Just-In-Time Power Gating of GasP Circuits.  

E-Print Network (OSTI)

?? In modern integrated circuits, one way to reduce power consumption is to turn off power to parts of the circuit when those are idle.… (more)

Padwal, Prachi Gulab

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Automatic fault extraction and simulation of layout realistic faults for integrated analogue circuits  

Science Conference Proceedings (OSTI)

A comprehensive tool has been implemented for the comparison of different test preparation techniques and target faults. It comprises of the realistic fault characterisation program LIFT that can extract sets of various faults from a given analogue or ... Keywords: AnaFAUL, LIFT, VCO, analogue integrated circuits, automatic analogue fault simulation program, catastrophic faults, circuit analysis computing, circuit layout, fault diagnosis, integrated analogue circuits, integrated circuit layout, integrated circuit testing, mixed analogue-digital integrated circuits, mixed-signal circuit, parametric faults, realistic fault characterisation program, simulation, test preparation, voltage-controlled oscillators

C. Sebeke; J. P. Teixeira; M. J. Ohletz

1995-03-01T23:59:59.000Z

362

Workload and user experience-aware dynamic reliability management in multicore processors  

Science Conference Proceedings (OSTI)

Reliability is a major concern for nanoscale CMOS circuits. Degradation phenomena such as Electromigration, Negative Bias Temperature Instability, Time Dependent Dielectric Breakdown worsen with transistor scaling. Dynamic Reliability Management (DRM) ...

Pietro Mercati, Andrea Bartolini, Francesco Paterna, Tajana Simunic Rosing, Luca Benini

2013-05-01T23:59:59.000Z

363

Cornell University Thermal Comfort Report  

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

Thermal Comfort Thermal Comfort Thermal comfort in the CUSD home is a top priority for our team. Accordingly, we designed a redundant HVAC system that would carefully manage the comfort of our decathletes and guests throughout the competition and the life of the house. The CUSD home's HVAC system was optimized for Washington, DC, with the cold Ithaca climate in mind. Our design tools included a schematic energy-modeling interface called TREAT, which was built off of the SuNREL platform. TREAT was used to passively condition the space. Our schematic energy modeling helped us properly size window areas, overhangs, and building mass distribution. We used a computation fluid dynamics (CFD) package called AirPak, to refine our design. The home was modeled in both

364

Synchronous Full-Scan for Asynchronous Handshake Circuits  

Science Conference Proceedings (OSTI)

Philips Research Laboratories, Electronic Design & Tools, Prof. ... Philips Research Laboratories, Information and Software Technology, Prof. ..... cannot be removed, the circuit has to be analyzed prior .... essential for the reliable hazard-

365

An energy optimal power supply for digital circuits  

E-Print Network (OSTI)

The energy efficiency of digital circuits continues to be a major factor in determining the size and weight of battery-operated electronics. Integration of more functionality in a single system has made battery longevity ...

Ramadass, Yogesh Kumar

2006-01-01T23:59:59.000Z

366

DOE - Office of Legacy Management -- Electro Circuits Inc - CA 08  

Office of Legacy Management (LM)

Electro Circuits Inc - CA 08 Electro Circuits Inc - CA 08 FUSRAP Considered Sites Site: Electro Circuits, Inc. (CA.08 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: 401 East Green Street , Pasadena , California CA.08-1 Evaluation Year: 1994 CA.08-2 Site Operations: Conducted ultrasonic tests on uranium ingots in the early 1950s. CA.08-3 CA.08-4 Site Disposition: Eliminated - Potential for contamination remote based on limited operations at the site CA.08-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium Metal CA.08-3 Radiological Survey(s): No Site Status: Eliminated from consideration under FUSRAP Also see Documents Related to Electro Circuits, Inc. CA.08-1 - AEC Memorandum; Parsegian to Musser; Subject: Transfer of

367

Circuits and algorithms for pipelined ADCs in scaled CMOS technologies  

E-Print Network (OSTI)

CMOS technology scaling is creating significant issues for analog circuit design. For example, reduced signal swing and device gain make it increasingly difficult to realize high-speed, high-gain feedback loops traditionally ...

Brooks, Lane Gearle, 1975-

2008-01-01T23:59:59.000Z

368

Design automation and analysis of three-dimensional integrated circuits  

E-Print Network (OSTI)

This dissertation concerns the design of circuits and systems for an emerging technology known as three-dimensional integration. By stacking individual components, dice, or whole wafers using a high-density electromechanical ...

Das, Shamik, 1977-

2004-01-01T23:59:59.000Z

369

Prospects for the development of digital CMOL circuits  

Science Conference Proceedings (OSTI)

This is a preliminary analysis of prospects and options for the development of hybrid CMOS/ nanoelectronic intergrated circuits, in particular those of the “CMOL” variety. We believe that CMOL technology is the most natural (and possibly ...

Dmitri B. Strukov; Konstantin K. Likharev

2007-10-01T23:59:59.000Z

370

Inductive compensation of operational amplifiers in feedback circuits  

E-Print Network (OSTI)

In this thesis I designed, implemented, and tested an integrated-circuit feedback compensator that uses inductors as compensation elements. Introducing inductors as feedback elements makes it possible to implement lead ...

Adams, Douglas Jay Kozak

2010-01-01T23:59:59.000Z

371

Characterization of process variability and robust optimization of analog circuits  

E-Print Network (OSTI)

Continuous scaling of CMOS technology has enabled dramatic performance enhancement of CMOS devices and has provided speed, power, and density improvement in both digital and analog circuits. CMOS millimeter-wave applications ...

Lim, Daihyun, 1976-

2008-01-01T23:59:59.000Z

372

Low energy digital circuit design using sub-threshold operation  

E-Print Network (OSTI)

Scaling of process technologies to deep sub-micron dimensions has made power management a significant concern for circuit designers. For emerging low power applications such as distributed micro-sensor networks or medical ...

Calhoun, Benton Highsmith, 1978-

2006-01-01T23:59:59.000Z

373

Energy-efficient threshold circuits computing mod functions  

Science Conference Proceedings (OSTI)

We prove that the modulus function MODm of n variables can be computed by a threshold circuit C of energy e and size s = O(e(n/m)1/(e?1)) for any integer e ? ...

Akira Suzuki, Kei Uchizawa, Xiao Zhou

2011-01-01T23:59:59.000Z

374

Real Time Models of the Asynchronous Circuits: The Delay Theory  

E-Print Network (OSTI)

The chapter from the book introduces the delay theory, whose purpose is the modeling of the asynchronous circuits from digital electrical engineering with ordinary and differential pseudo-boolean equations.

Serban E. Vlad

2004-12-17T23:59:59.000Z

375

Analog circuit optimization using evolutionary algorithms and convex optimization  

E-Print Network (OSTI)

In this thesis, we analyze state-of-art techniques for analog circuit sizing and compare them on various metrics. We ascertain that a methodology which improves the accuracy of sizing without increasing the run time or the ...

Aggarwal, Varun

2007-01-01T23:59:59.000Z

376

Material selection and nanofabrication techniques for electronic photonic integrated circuits  

E-Print Network (OSTI)

Electronic-photonic integrated circuits have the potential to circumvent many of the performance bottlenecks of electronics. To achieve the full benefits of integrating photonics with electronics it is generally believed ...

Holzwarth, Charles W., III (Charles Willett)

2009-01-01T23:59:59.000Z

377

Ordering circuit establishment in multiplane NoCs  

Science Conference Proceedings (OSTI)

Segregating networks-on-chips (NoCs) into data and control planes yields several opportunities for improving power and performance in chip-multiprocessor systems (CMPs). This article describes a hybrid packet/circuit switched multiplane network optimized ...

Ahmed Abousamra, Alex K. Jones, Rami Melhem

2013-10-01T23:59:59.000Z

378

Short Circuit Analysis of Induction Machines Wind Power Application  

Science Conference Proceedings (OSTI)

he short circuit behavior of Type I (fixed speed) wind turbine-generators is analyzed in this paper to aid in the protection coordination of wind plants of this type. A simple network consisting of one wind turbine-generator is analyzed for two network faults: a three phase short circuit and a phase A to ground fault. Electromagnetic transient simulations and sequence network calculations are compared for the two fault scenarios. It is found that traditional sequence network calculations give accurate results for the short circuit currents in the balanced fault case, but are inaccurate for the un-faulted phases in the unbalanced fault case. The time-current behavior of the fundamental frequency component of the short circuit currents for both fault cases are described, and found to differ significantly in the unbalanced and balanced fault cases

Starke, Michael R [ORNL; Smith, Travis M [ORNL; Howard, Dustin [Georgia Institute of Technology; Harley, Ronald [Georgia Institute of Technology

2012-01-01T23:59:59.000Z

379

Retroactivity, modularity, and insulation in synthetic biology circuits  

E-Print Network (OSTI)

A central concept in synthetic biology is the reuse of well-characterized modules. Modularity simplifies circuit design by allowing for the decomposition of systems into separate modules for individual construction. Complex ...

Lin, Allen

2011-01-01T23:59:59.000Z

380

Obstacle aware routing in 3d integrated circuits  

Science Conference Proceedings (OSTI)

Progressive scaling of technology node has serious impacts on the performance of VLSI circuits. A major influencing factor is the dominance of interconnect delay, and its associated effects such as excessive power consumption, signal integrity issues, ...

Prasun Ghosal; Hafizur Rahaman; Satrajit Das; Arindam Das; Parthasarathi Dasgupta

2011-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Triple inverter pierce oscillator circuit suitable for CMOS  

SciTech Connect

An oscillator circuit is disclosed which can be formed using discrete field-effect transistors (FETs), or as a complementary metal-oxide-semiconductor (CMOS) integrated circuit. The oscillator circuit utilizes a Pierce oscillator design with three inverter stages connected in series. A feedback resistor provided in a feedback loop about a second inverter stage provides an almost ideal inverting transconductance thereby allowing high-Q operation at the resonator-controlled frequency while suppressing a parasitic oscillation frequency that is inherent in a Pierce configuration using a "standard" triple inverter for the sustaining amplifier. The oscillator circuit, which operates in a range of 10 50 MHz, has applications for use as a clock in a microprocessor and can also be used for sensor applications.

Wessendorf; Kurt O. (Albuquerque, NM)

2007-02-27T23:59:59.000Z

382

Multisite optical neuromodulation : invention and application to emotion circuits  

E-Print Network (OSTI)

A single neural circuit, such as the network of neural populations involved in learning, expressing, and regulating fear, may spread across many brain regions and show functional heterogeneity among spatially overlapping ...

Bernstein, Jacob (Jacob Gold)

2009-01-01T23:59:59.000Z

383

SOFC seal and cell thermal management  

SciTech Connect

The solid oxide fuel cell module includes a manifold, a plate, a cathode electrode, a fuel cell and an anode electrode. The manifold includes an air or oxygen inlet in communication with divergent passages above the periphery of the cell which combine to flow the air or oxygen radially or inwardly for reception in the center of the cathode flow field. The latter has interconnects providing circuitous cooling passages in a generally radial outward direction cooling the fuel cell and which interconnects are formed of different thermal conductivity materials for a preferential cooling.

Potnis, Shailesh Vijay (Neenah, WI); Rehg, Timothy Joseph (Huntington Beach, CA)

2011-05-17T23:59:59.000Z

384

Po-210 distribution in uranium-mill circuits  

SciTech Connect

Greater than 99% of all incoming Po-210 reports to the tailing piles for both the acid and the alkaline leach uranium circuits. Leached Po-210 may be carried along on small particles rather than dissolved in solution. There does not appear to be any radiologically significant buildup or accumulation in the acid leach circuit, but there are noteworthy amounts in the molybdenum recovery solution.

McKlveen, J.W.; Hubele, N.D.; McDowell, W.J.; Case, G.N.

1983-01-01T23:59:59.000Z

385

Circuit Breaker Lubrication: Compatibility and Selection—Laboratory Assessment  

Science Conference Proceedings (OSTI)

The performance of a circuit breaker over its lifetime is largely determined by the performance of the materials and components that make up the complete breaker. The rates of deterioration of lubricants and other components drive the requirements for circuit breaker maintenance and refurbishment. The Electric Power Research Institute (EPRI) has undertaken a comprehensive research effort to develop the knowledge base required by utilities for the correct selection and application of lubricants for ...

2013-12-19T23:59:59.000Z

386

Circuit Breaker Lubrication - Assessment of Field-Aged Bearings  

Science Conference Proceedings (OSTI)

 The life cycle performance of a high-voltage circuit breaker is, to a large degree, determined by the performance of the materials and components that make up the complete breaker. The rates of deterioration of components such as compressors, pumps, seals, linkages and their lubrication, and interrupter elements drive the requirements for circuit breaker maintenance and refurbishment. EPRI conducted a series of investigations to enhance knowledge of aging processes and to identify those ...

2012-12-14T23:59:59.000Z

387

Power Circuit Breaker Lubrication: Laboratory Assessments and Lubrication Selection  

Science Conference Proceedings (OSTI)

The life cycle performance of a high voltage circuit breaker is, to a large degree, determined by the performance of the materials and components that make up the complete breaker. The rates of deterioration of components such as compressors, pumps, seals, linkages and their lubrication and interrupter elements drive the requirements for circuit breaker maintenance and refurbishment. EPRI has conducted a series of investigation to enhance knowledge of aging processes and to identify those materials ...

2012-12-13T23:59:59.000Z

388

Cooling circuit for a gas turbine bucket and tip shroud  

SciTech Connect

An open cooling circuit for a gas turbine bucket wherein the bucket has an airfoil portion, and a tip shroud, the cooling circuit including a plurality of radial cooling holes extending through the airfoil portion and communicating with an enlarged internal area within the tip shroud before exiting the tip shroud such that a cooling medium used to cool the airfoil portion is subsequently used to cool the tip shroud.

Willett, Fred Thomas (25 Long Creek Dr., Burnt Hills, NY 12027); Itzel, Gary Michael (12 Cider Mill Dr., Clifton Park, NY 12065); Stathopoulos, Dimitrios (11 Wyngate Rd., Glenmont, NY 12077); Plemmons, Larry Wayne (late of Hamilton, OH); Plemmons, Helen M. (2900 Long Ridge Trails, Hamilton, OH 45014); Lewis, Doyle C. (444 River Way, Greer, SC 29651)

2002-01-01T23:59:59.000Z

389

Low Power Photomultiplier Tube Circuit And Method Thereor  

DOE Patents (OSTI)

An electrical circuit for a photomultiplier tube (PMT) is disclosed that reduces power consumption to a point where the PMT may be powered for extended periods with a battery. More specifically, the invention concerns a PMT circuit comprising a low leakage switch and a high voltage capacitor positioned between a resistive divider and each of the PMT dynodes, and a low power control scheme for recharging the capacitors.

Bochenski, Edwin B. (Tracy, CA); Skinner, Jack L. (Brentwood, CA); Dentinger, Paul M. (Sunol, CA); Lindblom, Scott C. (Tracy, CA)

2006-04-18T23:59:59.000Z

390

Planning Methodology to Determine Practical Circuit Limits for Distributed Generation  

Science Conference Proceedings (OSTI)

Utility distribution planners are increasingly faced with accommodating large sizes of distributed generation (DG) on their power distribution circuits. In many states, the renewable portfolio standards and incentives from various sources have resulted in larger solar PV installations than experienced previously. These are often located in parts of the distribution circuits where voltage is more difficult to regulate. This project investigated planning methodologies for determining practical limits for D...

2010-12-31T23:59:59.000Z

391

Circuit arrangement for starting and operating a gas discharge laser  

SciTech Connect

A circuit arrangement is described for starting and operating a gas discharge laser having a starting phase and an operating phase. It consists of two supply lines for supplying a direct current to the gas discharge laser, a ballast resistor connected in at least one of the supply lines, and circuit means in shunt with the ballast resistor through which a starting current flows during the starting phase of the gas discharge laser.

Bolhuis, P.J.

1989-04-25T23:59:59.000Z

392

Demonstration of a Computational Fluid Dynamics (CFD) Tool Used...  

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

Demonstration of a Computational Fluid Dynamics (CFD) Tool Used for Data Center Modeling, Thermal Analysis and Operational Management Speaker(s): Saket Karajgikar Date: November...

393

Thermal conductivity of thermal-battery insulations  

DOE Green Energy (OSTI)

The thermal conductivities of a variety of insulating materials used in thermal batteries were measured in atmospheres of argon and helium using several techniques. (Helium was used to simulate the hydrogen atmosphere that results when a Li(Si)/FeS{sub 2} thermal battery ages.) The guarded-hot-plate method was used with the Min-K insulation because of its extremely low thermal conductivity. For comparison purposes, the thermal conductivity of the Min-K insulating board was also measured using the hot-probe method. The thermal-comparator method was used for the rigid Fiberfrax board and Fiberfrax paper. The thermal conductivity of the paper was measured under several levels of compression to simulate the conditions of the insulating wrap used on the stack in a thermal battery. The results of preliminary thermal-characterization tests with several silica aerogel materials are also presented.

Guidotti, R.A.; Moss, M.

1995-08-01T23:59:59.000Z

394

Safety control circuit for a neutronic reactor  

DOE Patents (OSTI)

A neutronic reactor comprising an active portion containing material fissionable by neutrons of thermal energy, means to control a neutronic chain reaction within the reactor comprising a safety device and a regulating device, a safety device including means defining a vertical channel extending into the reactor from an aperture in the upper surface of the reactor, a rod containing neutron-absorbing materials slidably disposed within the channel, means for maintaining the safety rod in a withdrawn position relative to the active portion of the reactor including means for releasing said rod on actuation thereof, a hopper mounted above the active portion of the reactor having a door disposed at the bottom of the hopper opening into the vertical channel, a plurality of bodies of neutron-absorbing materials disposed within the hopper, and means responsive to the failure of the safety rod on actuation thereof to enter the active portion of the reactor for opening the door in the hopper.

Ellsworth, Howard C. (Richland, WA)

2004-04-27T23:59:59.000Z

395

Thermal Mediation by Littoral Wetlands and Impact on Lake Intrusion Depth  

E-Print Network (OSTI)

Lake inflow dynamics can be affected by the thermal mediation provided by shallow littoral regions such as wetlands. In this study, wetland thermal mediation is evaluated using a linearized dead-zone model. Its impact on ...

Andradottir, Hrund O.

396

Low thermal resistance power module assembly  

DOE Patents (OSTI)

A power module assembly (400) with low thermal resistance and enhanced heat dissipation to a cooling medium. The assembly includes a heat sink or spreader plate (410) with passageways or openings (414) for coolant that extend through the plate from a lower surface (411) to an upper surface (412). A circuit substrate (420) is provided and positioned on the spreader plate (410) to cover the coolant passageways. The circuit substrate (420) includes a bonding layer (422) configured to extend about the periphery of each of the coolant passageways and is made up of a substantially nonporous material. The bonding layer (422) may be solder material which bonds to the upper surface (412) of the plate to provide a continuous seal around the upper edge of each opening (414) in the plate. The assembly includes power modules (430) mounted on the circuit substrate (420) on a surface opposite the bonding layer (422). The power modules (430) are positioned over or proximal to the coolant passageways.

Hassani, Vahab (Denver, CO); Vlahinos, Andreas (Castle Rock, CO); Bharathan, Desikan (Arvada, CO)

2010-12-28T23:59:59.000Z

397

Pyrometer mount for a closed-circuit thermal medium cooled gas turbine  

SciTech Connect

A steam-cooled second-stage nozzle segment has an outer band and an outer cover defining a plenum therebetween for receiving cooling steam for flow through the nozzles to the inner band and cover therefor and return flow through the nozzles. To measure the temperature of the buckets of the stage forwardly of the nozzle stage, a pyrometer boss is electron beam-welded in an opening through the outer band and TIG-welded to the outer cover plate. By machining a hole through the boss and seating a linearly extending tube in the boss, a line of sight between a pyrometer mounted on the turbine frame and the buckets is provided whereby the temperature of the buckets can be ascertained. The welding of the boss to the outer band and outer cover enables steam flow through the plenum without leakage, while providing a line of sight through the outer cover and outer band to measure bucket temperature.

Jones, Raymond Joseph (Duanesburg, NY); Kirkpatrick, Francis Lawrence (late of Galway, NY); Burns, James Lee (Schenectady, NY); Fulton, John Robert (Clifton Park, NY)

2002-01-01T23:59:59.000Z

398

Modeling and simulation of substrate noise in mixed-signal circuits applied to a special VCO  

Science Conference Proceedings (OSTI)

The mixed-signal circuits with both analog and digital blocks on a single chip have wide applications in communication and RF circuits. Integrating these two blocks can cause serious problems especially in applications with fast digital circuits and ... Keywords: Green's function, VCO, mixes-signal circuits, phase noise, substrate noise

Golnar Khodabandehloo; Sattar Mirzakuchaki

2006-09-01T23:59:59.000Z

399

Circuit optimization techniques to mitigate the effects of soft errors in combinational logic  

Science Conference Proceedings (OSTI)

Soft errors in combinational logic circuits are emerging as a significant reliability problem for VLSI designs. Technology scaling trends indicate that the soft error rates (SER) of logic circuits will be dominant factor for future technology generations. ... Keywords: Soft errors, circuit optimization, combinational logic, sequential circuits

Rajeev R. Rao; Vivek Joshi; David Blaauw; Dennis Sylvester

2009-12-01T23:59:59.000Z

400

A circuit for monitoring electric currents produced by a twin bridge calorimeter  

DOE Patents (OSTI)

A circuit for measuring temperature differentials in a calorimeter is disclosed. The temperature differential between the reference element and sample element containing a radioactive material is measured via a wheatstone bridge arrangement of thermistors. The bridge is driven with an alternating current on a pulsed basis to maintain the thermal floor of the calorimeter at a low reference value. A lock-in amplifier connected to the bridge phase locks a signal from the bridge to the input pulsed AC signal to provide a DC voltage. The DC voltage is sampled over time and provided to a digital computer. The digital computer, using curve fitting algorithms, will derive a function for the sample data. From the function, an equilibrium value for the temperature may be calculated. 4 figs.

Donohoue, T.P.; Oertal, C.P.; Tyree, W.H.; Valdez, J.L.

1990-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

A circuit for monitoring electric currents produced by a twin bridge calorimeter  

DOE Patents (OSTI)

A circuit for measuring temperature differentials in a calorimeter is disclosed. The temperature differential between the reference element and sample element containing a radioactive material is measured via a wheatstone bridge arrangement of thermistors. The bridge is driven with an alternating current on a pulsed basis to maintain the thermal floor of the calorimeter at a low reference value. A lock-in amplifier connected to the bridge phase locks a signal from the bridge to the input pulsed AC signal to provide a DC voltage. The DC voltage is sampled over time and provided to a digital computer. The digital computer, using curve fitting algorithms, will derive a function for the sample data. From the function, an equilibrium value for the temperature may be calculated. 4 figs.

Donohoue, T.P.; Oertal, C.P.; Tyree, W.H.; Valdez, J.L.

1990-01-01T23:59:59.000Z

402

Calorimeter Preamplifier Hybrid Circuit Test Jig  

SciTech Connect

There are two ways in which the testing may be initiated, remotely or locally. If the remote operation is desired, an external TTL level signal must be provided to the test jig with the remotellocal switch on the side of the test jig switched to remote. A logic high will initiate the test. A logic low will terminate the test. In the event that an external signal is connected to the test jig while local operation occurs, the local control takes precedence over remote control. Once a DVT has been locked in the ZIF socket and the DIP switches are selected, the Push-to-Test button may be depressed. Momentarily depressing the button will initiate a test with a minimum 400 ms duration. At the same time a PBCLOCK and PBLATCH pulses will be initiated and the power rails +12V, +8V, and -6V will be ramped to full voltage. The time at which the power rails reach the full voltage is about 13 ms and it is synchronized with bypass capacitors placed on COMP input of U20 and U22 and on the output of U23 voltage regulators. The voltage rails are supplied to a {+-}10% window comparator. A red LED indicates the rail is below or above 10% of the design value. A green LED indicates the rail is within acceptable limits. For DDT with a 5 pF and 10 pF feed back capacitor, the +12V and +8V rails are current-regulated to 19rnA and 22 rnA respectively and the -6V rail is short-circuit protected within the regulator. For DUT with a 22 pF feed back capacitor the current regulation is the same as above except that the +8V rail is current regulated to 43 rnA. The power rails are supplied to the DUT via a 10 {Omega} resistor. The voltage drop across this resistor is sensed by a differential amplifier AD620 and amplified by a gain of 10. An external BNC connection is provided from this point to allow for current measurements by the vendor. The current value for each rail is calculated by measuring the voltage value at this point and divided by (10*10{Omega}). The next stage inverts and amplifies the voltage signal by a factor of 5 for + 12V and -6V rails and by a factor of 1 for +8V rail. For DUT with 22 pF feed back capacitor the amplification factors are same as above except that the amplification factor for +8V rail is a gain of 2. An offset null potentiometer is provided between the AD620 and the inverting stage which eliminates device offset current errors. The inverted and amplified voltage is presented to two window comparators. One of them compares the inverted and amplified voltage to the low threshold point and the other one compares the inverted and amplified voltage to the high threshold point. If the inverted and amplified voltage is within the low and high threshold points, both the low and the high current LEDs illuminate green indicating the current is within acceptable limits. If the inverted and amplified voltage is below the low threshold point or above the high threshold point, the low current LED or the high current LED illuminates red, respectively, indicating the current is outside acceptable limits.

Abraham, B.M.; /Fermilab

1999-04-19T23:59:59.000Z

403

Three approaches to classical thermal field theory  

SciTech Connect

Research Highlights: > Classical thermal field theory admits three equivalent path integral formulations. > Classical Feynman rules can be derived for all three formulations. > Quantum Feynman rules reduce to classical ones at high temperatures. > Classical Feynman rules become much simpler when superfields are introduced. - Abstract: In this paper we study three different functional approaches to classical thermal field theory, which turn out to be the classical counterparts of three well-known different formulations of quantum thermal field theory: the closed-time path (CTP) formalism, the thermofield dynamics (TFD) and the Matsubara approach.

Gozzi, E., E-mail: gozzi@ts.infn.it [Department of Physics, University of Trieste, Strada Costiera 11, Miramare - Grignano, 34151 Trieste (Italy); INFN, Sezione di Trieste (Italy); Penco, R., E-mail: rpenco@syr.edu [Department of Physics, Syracuse University, Syracuse, NY 13244-1130 (United States)

2011-04-15T23:59:59.000Z

404

Seasonal thermal energy storage  

DOE Green Energy (OSTI)

This report describes the following: (1) the US Department of Energy Seasonal Thermal Energy Storage Program, (2) aquifer thermal energy storage technology, (3) alternative STES technology, (4) foreign studies in seasonal thermal energy storage, and (5) economic assessment.

Allen, R.D.; Kannberg, L.D.; Raymond, J.R.

1984-05-01T23:59:59.000Z

405

Thermal Performance Predictions of a Heat Pipe and Heat Dissipation Systems Using FEM.  

E-Print Network (OSTI)

??The aim of this work is to carry out analyses, thermal and fluid dynamics of element used to heat transimission that can be utilized to… (more)

VIGNA, GIUSEPPE

2008-01-01T23:59:59.000Z

406

Identifying the unknown circuit breaker statuses in power networks  

Science Conference Proceedings (OSTI)

This paper describes an approach by which the circuit breaker status errors can be detected and identified in the presence of analog measurement errors. This is accomplished by using the least absolute value (LAV) state estimation method and applying the previously suggested two stage estimation approach. The ability of the LAV estimators to reject inconsistent measurements, is exploited in order to differentiate between circuit breaker status and analog measurement errors. The first stage of estimation uses a bus level network model as in conventional LAV estimators. Results of Stage 1 are used to draw a set of suspect buses whose substation configurations may be erroneous. In the second stage, the identified buses are modeled in detail using the bus sections and the circuit breaker models while keeping the bus level network models for the rest of the system. The LAV estimation is repeated for the expanded system model and any remaining significant normalized residuals are flagged as bad analog measurements, while the correct topology is determined based on the estimated flows through the modeled circuit breakers in the substations. The proposed approach is implemented and tested. Simulation results for cases involving circuit breaker status and/or analog measurement errors are provided.

Abur, A.; Kim, H. [Texas A and M Univ., College Station, TX (United States). Dept. of Electrical Engineering; Celik, M.K. [Celik (Mehmet K.), San Francisco, CA (United States)

1995-11-01T23:59:59.000Z

407

Dual-circuit embossed-sheet heat-transfer panel  

DOE Patents (OSTI)

A heat transfer panel provides redundant cooling for fusion reactors or the like environment requiring low-mass construction. Redundant cooling is provided by two independent cooling circuits, each circuit consisting of a series of channels joined to inlet and outlet headers. The panel comprises a welded joinder of two full-size and two much smaller partial-size sheets. The first full-size sheet is embossed for form first portions of channels for the first and second circuits, as well as a header for the first circuit. The second full-sized sheet is then laid over and welded to the first full-size sheet. The first and second partial-size sheets are then overlaid on separate portions of the second full-sized sheet, and are welded thereto. The first and second partial-sized sheets are embossed to form inlet and outlet headers, which communicate with channels of the second circuit through apertures formed in the second full-sized sheet.

Morgan, G.D.

1982-08-23T23:59:59.000Z

408

Students' Understanding of Direct Current Resistive Electrical Circuits  

E-Print Network (OSTI)

Research has shown that both high school and university students' reasoning patterns regarding direct current resistive electric circuits often differ from the currently accepted explanations. At present, there are no standard diagnostic examinations in electric circuits. Two versions of a diagnostic instrument called Determining and Interpreting Resistive Electric circuits Concepts Tests (DIRECT) were developed, each consisting of 29 questions. The information provided by the exam provides classroom instructors a means with which to evaluate the progress and conceptual difficulties of their students and their instructional methods. It can be used to evaluate curricular packages and/or other supplemental materials for their effectiveness in overcoming students' conceptual difficulties. The analyses indicate that students, especially females, tend to hold multiple misconceptions, even after instruction. During interviews, the idea that the battery is a constant source of current was used most often in answering the questions. Students tended to focus on current in solving the problems and to confuse terms, often assigning the properties of current to voltage and/or resistance. Results indicated that students do not have a clear understanding of the underlying mechanisms of electric circuit phenomena. On the other hand, students were able to translate easily from a "realistic" representation of a circuit to the corresponding schematic diagram.

Paula V. Engelhardt; Robert J. Beichner

2003-04-10T23:59:59.000Z

409

The Tropopause and the Thermal Stratification in the Extratropics of a Dry Atmosphere  

Science Conference Proceedings (OSTI)

A dynamical constraint on the extratropical tropopause height and thermal stratification is derived by considerations of entropy fluxes, or isentropic mass fluxes, and their different magnitudes in the troposphere and stratosphere. The dynamical ...

Tapio Schneider

2004-06-01T23:59:59.000Z

410

Thermal Stability of Li-Ion Cells  

DOE Green Energy (OSTI)

The thermal stability of Li-ion cells with intercalating carbon anodes and metal oxide cathodes was measured as a function of state of charge and temperature for two advanced cell chemistries. Cells of the 18650 design with Li{sub x}CoO{sub 2} cathodes (commercial SONY cells) and Li{sub x}Ni{sub 0.8}Co{sub 0.2}O{sub 2} cathodes were measured for thermal reactivity in the open circuit cell condition. Accelerating rate calorimetry (ARC) was used to measure cell thermal runaway as a function of state of charge (SOC). Microcalorimetry was used to measure the time dependence of heat generating side reactions also as a function of SOC. Components of cells were measured using differential scanning calorimetry (DSC) to study the thermal reactivity of the individual electrodes to determine the temperature regimes and conditions of the major thermal reactions. Thermal decomposition of the SEI layer at the anodes was identified as the initiating source for thermal runaway. The cells with Li{sub x}CoO{sub 2} cathodes showed greater sensitivity to SOC and higher accelerating heating rates than seen for the cells with Li{sub x}Ni{sub 0.8}Co{sub 0.2}O{sub 2}cathodes. Lower temperature reactions starting as low as 40 C were also observed that were SOC dependent but not accelerating. These reactions were also measured in the microcalorimeter and observed to decay over time with a power-law dependence and are believed to result in irreversible capacity loss in the cells.

ROTH,EMANUEL P.

1999-09-17T23:59:59.000Z

411

Optimal control for maximum power in thermal and chemical systems  

Science Conference Proceedings (OSTI)

This research treats power optimization for energy converters, such like thermal, solar and chemical engines. Thermodynamic analyses lead to converter's efficiency and limiting power. Steady and dynamic systems are investigated. Static optimization of ...

Stanislaw Sieniutycz

2009-09-01T23:59:59.000Z

412

DSOPilot project Automatic receipt of short circuiting indicators (Smart  

Open Energy Info (EERE)

DSOPilot project Automatic receipt of short circuiting indicators (Smart DSOPilot project Automatic receipt of short circuiting indicators (Smart Grid Project) Jump to: navigation, search Project Name DSOPilot project Automatic receipt of short circuiting indicators Country Denmark Coordinates 56.26392°, 9.501785° 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":56.26392,"lon":9.501785,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

413

Field tests of a circuit breaker synchronous control  

Science Conference Proceedings (OSTI)

A circuit breaker synchronous control interface which controls the point-on-wave at which shunt reactor circuit breakers open or close has been developed and tested on Hydro-Quebec`s 735-kV power system. It takes into account the influence of outdoor temperature on the breaker closing and opening times. It is also equipped with a reignition and a high-inrush-current detection system. Opening tests at different preset arcing times were conducted and the arcing time range where there are no re-ignitions in air-blast breakers was established. The tests showed that the interface is a valuable device for the elimination of re-ignitions associated with the interruption of small inductive currents. Closing tests have shown that the interface is also useful for the limitation of high inrush currents by selecting an appropriate point-on-wave for circuit breaker closing.

Rajotte, R.J.; Charpentier, C.; Breault, S.; Le, H.H.; Huynh, H. [Hydro-Quebec, Montreal, Quebec (Canada); Desmarais, J. [Snemo Ltd., Brossard, Quebec (Canada)

1995-07-01T23:59:59.000Z

414

Detecting non-Abelian geometric phase in circuit QED  

E-Print Network (OSTI)

We propose a scheme for detecting noncommutative feature of the non-Abelian geometric phase in circuit QED, which involves three transmon qubits capacitively coupled to an one-dimensional transmission line resonator. By controlling the external magnetic flux of the transmon qubits, we can obtain an effective tripod interaction of our circuit QED setup. The noncommutative feature of the non-Abelian geometric phase is manifested that for an initial state undergo two specific loops in different order will result in different final states. Our numerical calculations show that this difference can be unambiguously detected in the proposed system.

Man-Lv Peng; Jian Zhou; Zheng-Yuan Xue

2013-03-03T23:59:59.000Z

415

Base drive circuit for a four-terminal power Darlington  

DOE Patents (OSTI)

A high power switching circuit which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In one application, the switching circuit is used in each power switching element in a chopper-inverter drive of an electric vehicle propulsion system.

Lee, Fred C. (Blacksburg, VA); Carter, Roy A. (Salem, VA)

1983-01-01T23:59:59.000Z

416

Residue arithmetic circuit design based on integrated optics  

SciTech Connect

Hybrid circuits containing integrated optical detectors, waveguides, and electro-optic switches can be used to perform a variety of digital logic operations. In combining the hybrid circuits with the carry-free residue arithmetic algorithm, different modules are designed to perform basic arithmetic operations, encoding, decoding, and scaling. Based on pipelining and parallel concepts, a vector-vector multiplier is designed to yield very high throughput rate for application involving traditionally slow computation such as matrix-vector multiplication and polynomial evaluation. 18 references.

Huang, S.Y.; Lee, S.H.

1982-01-01T23:59:59.000Z

417

Tunable single-photon heat conduction in electrical circuits  

E-Print Network (OSTI)

We build on the study of single-photon heat conduction in electronic circuits taking into account the back-action of the superconductor--insulator--normal-metal thermometers. In addition, we show that placing capacitors, resistors, and superconducting quantum interference devices (SQUIDs) into a microwave cavity can severely distort the spatial current profile which, in general, should be accounted for in circuit design. The introduction of SQUIDs also allows for in situ tuning of the photonic power transfer which could be utilized in experiments on superconducting quantum bits.

P. J. Jones; J. A. M. Huhtamäki; M. Partanen; K. Y. Tan; M. Möttönen

2012-05-21T23:59:59.000Z

418

Automated Load Balancing of Medium-Voltage Distribution Circuits  

Science Conference Proceedings (OSTI)

The objective of this project is to investigate the possibility of using an automated system to maintain optimal load balance in distribution circuits. The practice used by many utilities is to use a line crew and engineering personnel to measure load balance at key points in each circuit and manually move single-phase lateral taps to different phases to obtain the desired load balance among the phases. This practice has many shortcomings: The load balance is achieved only for a single point in ...

2013-03-21T23:59:59.000Z

419

Generating efficient quantum circuits for preparing maximally multipartite entangled states  

E-Print Network (OSTI)

In this work we provide a method for generating quantum circuits preparing maximally multipartite entangled states using genetic programming. The presented method is faster that known realisations thanks to the applied fitness function and several modifications to the genetic programming schema. Moreover, we enrich the described method by the unique possibility to define an arbitrary structure of a system. We use the developed method to find new quantum circuits, which are simpler from known results. We also analyse the efficiency of generating entanglement in the spin chain system and in the system of complete connections.

Przemys?aw Sadowski

2013-03-15T23:59:59.000Z

420

Transistorized power switch and base drive circuit therefore  

DOE Green Energy (OSTI)

A high power switching circuit is disclosed which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn-off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In one application, the switching circuit is used in each power switching element in a chopper-inverter drive of an electric vehicle propulsion system.

Lee, F.C.; Carter, R.A.

1981-03-24T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Asymptotic Expressions for Charge Matrix Elements of the Fluxonium Circuit  

E-Print Network (OSTI)

In charge-coupled circuit QED systems, transition amplitudes and dispersive shifts are governed by the matrix elements of the charge operator. For the fluxonium circuit, these matrix elements are not limited to nearest-neighbor energy levels and are conveniently tunable by magnetic flux. Previously, their values were largely obtained numerically. Here, we present analytical expressions for the fluxonium charge matrix elements. We show that new selection rules emerge in the asymptotic limit of large Josephson energy and small inductive energy. We illustrate the usefulness of our expressions for the qualitative understanding of charge matrix elements in the parameter regime probed by previous experiments.

Zhu, Guanyu

2013-01-01T23:59:59.000Z

422

Short communication Electronic circuit model for proton exchange membrane fuel cells ?  

E-Print Network (OSTI)

The proton exchange membrane (PEM) fuel cell is being investigated as an alternate power source for various applications like transportation and emergency power supplies. The paper presents a novel circuit model for a PEM fuel cell that can be used to design and analyze fuel cell power systems. The PSPICE-based model uses bipolar junction transistors (BJTs) and LC elements available in the PSPICE library with some modification. The model includes the phenomena like activation polarization, ohmic polarization, and mass transport effect present in a PEM fuel cell. The static and dynamic characteristics obtained through simulation are compared with experimental results obtained on a commercial fuel cell module. © 2004 Elsevier B.V. All rights reserved.

Dachuan Yu; S. Yuvarajan

2004-01-01T23:59:59.000Z

423

Topology, design, analysis and thermal management of power electronics for hybrid electric vehicle  

E-Print Network (OSTI)

for fuel cells and advanced heavy-duty hybrid electric vehicles. He also has experience with alternativeTopology, design, analysis and thermal management of power electronics for hybrid electric vehicle an important role in the success of electric, hybrid and fuel cell vehicles. Typical power electronics circuits

Mi, Chunting "Chris"

424

Practical Solar Thermal Chilled Water  

E-Print Network (OSTI)

With the pressing need for the United States to reduce our dependence upon fossil fuels, it has become a national priority to develop technologies that allow practical use of renewable energy sources. One such energy source is sunlight. It has the potential to impact America's use of non-renewable energy beyond its own design capacity by applying it to the optimization of an existing building's system. Solar-thermal chilling systems are not new. However, few of them can be described as a practical success. The primary reason for these disappointments is a misunderstanding of solar energy dynamics by air conditioning designers; combined with a similar misunderstanding by solar engineers of how thermally driven chillers react to the loads and energy sources applied to them. With this in mind, a modeling tool has been developed which provides the flexibility to apply a strategy which can be termed, Optimization by Design.

Leavell, B.

2010-01-01T23:59:59.000Z

425

Performance-aware thermal management via task scheduling  

Science Conference Proceedings (OSTI)

High on-chip temperature impairs the processor's reliability and reduces its lifetime. Hardware-level dynamic thermal management (DTM) techniques can effectively constrain the chip temperature, but degrades the performance. We propose an OS-level technique ... Keywords: Thermal management, task scheduling

Xiuyi Zhou; Jun Yang; Marek Chrobak; Youtao Zhang

2010-04-01T23:59:59.000Z

426

Nuclear Thermal Rockets: The Physics of the Fission Reactor  

E-Print Network (OSTI)

Nuclear Thermal Rockets: The Physics of the Fission Reactor Shane D. Ross Control and Dynamical combustion are those powered by nuclear fission. Comparison of Chemical and Nuclear Rockets. Most existent.g., hydrogen and oxygen). In a nuclear rocket, or more precisely, a nuclear thermal rocket, the propellant

Ross, Shane

427

Heavy ion SEU immunity of a GaAs complementary HIGFET circuit fabricated on a low temperature grown buffer layer  

SciTech Connect

The authors compare dynamic SEU characteristics of GaAs complementary HIGFET devices fabricated on conventional semi-insulating substrates versus low temperature grown GaAs (LT GaAs) buffer layers. Heavy ion test results on shift register and flip-flop devices from the same process lot demonstrate that the LT GaAs layer provides immunity from upsets, even at an LET value of 90 MeV {center_dot} cm{sup 2}/mg. This result is also consistent with pulsed laser measurements performed on the same flip-flop circuits used in the ion test.

Marshall, P.W.; Weatherford, T.; Carts, M. [Naval Research Lab., Washington, DC (United States)]|[SFA, Inc., Landover, MD (United States); Dale, C.J.; McMorrow, D. [Naval Research Lab., Washington, DC (United States); Peczalski, A.; Baier, S.; Nohava, J.; Skogen, J. [Honeywell Systems and Research Center, Bloomington, MN (United States)

1995-12-01T23:59:59.000Z

428

Analog Baseband Circuits for WCDMA Direct-Conversion Receivers  

E-Print Network (OSTI)

This thesis describes the design and implementation of analog baseband circuits for low-power single-chip WCDMA direct-conversion receivers. The reference radio system throughout the thesis is UTRA/FDD. The analog baseband circuit consists of two similar channels, which contain analog channel-select filters, programmable-gain amplifiers, and circuits that remove DC offsets. The direct-conversion architecture is described and the UTRA/FDD system characteristics are summarized. The UTRA/FDD specifications define the performance requirement for the whole receiver. Therefore, the specifications for the analog baseband circuit are obtained from the receiver requirements through calculations performed by hand. When the power dissipation of an UTRA/FDD direct-conversion receiver is minimized, the design parameters of an all-pole analog channel-select filter and the following Nyquist rate analog-to-digital converter must be considered simultaneously. In this thesis, it is shown that minimum power consumption is achieved with a fifth-order lowpass filter and a 15.36-MS/s Nyquist rate converter that has a 7- or 8-bit resolution. A fifth-order Chebyshev prototype with a passband ripple of 0.01dB and a –3-dB frequency of 1.92-MHz is adopted in this thesis. The

Jarkko Jussila; Teknillinen Korkeakoulu; Otamedia Oy

2003-01-01T23:59:59.000Z

429

Notes on Magnetic Circuits ME 104, Prof. B. Paden  

E-Print Network (OSTI)

, on the terminals of the inductor. The current induces a field H (that has various names) and a magnetic field B-clockwise, the direction of flux when there is a positive current. To understand this magnetic circuit, we derive of current is out of the page and the positive sense for the magnetic field is given by the right-hand rule

Paden, Brad

430

Demodulation circuit for AC motor current spectral analysis  

DOE Patents (OSTI)

A motor current analysis method for the remote, noninvasive inspection of electric motor-operated systems. Synchronous amplitude demodulation and phase demodulation circuits are used singly and in combination along with a frequency analyzer to produce improved spectral analysis of load-induced frequencies present in the electric current flowing in a motor-driven system.

Hendrix, Donald E. (Oak Ridge, TN); Smith, Stephen F. (Knoxville, TN)

1990-12-18T23:59:59.000Z

431

Controllability of Static CMOS Circuits for Timing Characterization  

Science Conference Proceedings (OSTI)

Timing violations, also known as delay faults, are a major source of defective silicon in modern Integrated Circuits (ICs), designed in Deep Sub-micron (DSM) technologies, making it imperative to perform delay fault testing in these ICs. However, DSM ... Keywords: Delay fault testing, Design for test, Scan design

Ramyanshu Datta; Ravi Gupta; Antony Sebastine; Jacob A. Abraham; Manuel D'Abreu

2008-10-01T23:59:59.000Z

432

Integrated circuit with dissipative layer for photogenerated carriers  

DOE Patents (OSTI)

The sensitivity of an integrated circuit to single-event upsets is decreased by providing a dissipative layer of silicon nitride between a silicon substrate and the active device. Free carriers generated in the substrate are dissipated by the layer before they can build up charge on the active device. 1 fig.

Myers, D.R.

1988-04-20T23:59:59.000Z

433

Integrated circuit with dissipative layer for photogenerated carriers  

DOE Patents (OSTI)

The sensitivity of an integrated circuit to single-event upsets is decreased by providing a dissi The U.S. Government has rights in this invention pursuant to Contract No. DE-ACO4-76DP00789 between the Department of Energy and AT&T Technologies, Inc.

Myers, David R. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

434

Integrated circuit with dissipative layer for photogenerated carriers  

DOE Patents (OSTI)

The sensitivity of an integrated circuit to single-event upsets is decreased by providing a dissi The U.S. Government has rights in this invention pursuant to Contract No. DE-ACO4-76DP00789 between the Department of Energy and AT&T Technologies, Inc.

Myers, D.R.

1989-09-12T23:59:59.000Z

435

Performance of digital integrated circuit technologies at very high temperatures  

Science Conference Proceedings (OSTI)

Results of investigations of the performance and reliability of digital bipolar and CMOS integrated circuits over the 25 to 340/sup 0/C range are reported. Included in these results are both parametric variation information and analysis of the functional failure mechanisms. Although most of the work was done using commercially available circuits (TTL and CMOS) and test chips from commercially compatible processes, some results of experimental simulations of dielectrically isolated CMOS are also discussed. It was found that commercial Schottky clamped TTL, and dielectrically isolated, low power Schottky-clamped TTL, functioned to junction temperatures in excess of 325/sup 0/C. Standard gold doped TTL functioned only to 250/sup 0/C, while commercial, isolated I/sup 2/L functioned to the range 250/sup 0/C to 275/sup 0/C. Commercial junction isolated CMOS, buffered and unbuffered, functioned to the range 280/sup 0/C to 310/sup 0/C/sup +/, depending on the manufacturer. Experimental simulations of simple dielectrically isolated CMOS integrated circuits, fabricated with heavier doping levels than normal, functioned to temperatures in excess of 340/sup 0/C. High temperature life testing of experimental, silicone-encapsulated simple TTL and CMOS integrated circuits have shown no obvious life limiting problems to date. No barrier to reliable functionality of TTL bipolar or CMOS integrated ciruits at temperatures in excess of 300/sup 0/C has been found.

Prince, J.L.; Draper, B.L.; Rapp, E.A.; Kromberg, J.N.; Fitch, L.T.

1980-01-01T23:59:59.000Z

436

An Experimental Study of Circuit Breakers: The Effect  

E-Print Network (OSTI)

Abstract: This paper analyzes the effect of circuit breakers on price behavior, trading volume, and profit-making ability in a market setting. We conduct nine experimental asset markets to compare behavior across three regulatory regimes: market closure, temporary halt, and no interruption. The presence of a circuit breaker rule does not affect the magnitude of the absolute deviation in price from fundamental value or trading profit. The primary driver of behavior is information asymmetry in the market. By comparison, trading activity is significantly affected by the presence of a circuit breaker. Mandated market closures cause market participants to advance trades. JEL classification: D40, G10, G14 Key words: circuit breakers, trading halts, market structure The authors thank the Federal Reserve Bank of Atlanta for financial support, Kendra Hiscox for valuable research assistance, and Jin-Wan Cho, Jerry Dwyer, Kalpana Narayanan, Joe Sinkey, and seminar participants at Georgia Tech and the Atlanta Finance Workshop for helpful comments. The views expressed here are the authors ’ and not necessarily those of the Federal Reserve Bank of Atlanta or the Federal Reserve System. Any remaining errors are

Lucy F. Ackert; Bryan K. Church; Narayanan Jayaraman

1999-01-01T23:59:59.000Z

437

Application of computers to circuit design for Univac Larc  

Science Conference Proceedings (OSTI)

The design of circuits for computers has become in recent years a complex undertaking. The problem is two-fold. On one hand optimization of cost and speed is the prime objective. On the other hand, complexity is increased through factors such as component ...

Gilbert Kaskey; Noah S. Prywes; Herman Lukoff

1961-05-01T23:59:59.000Z

438

Conveyorized Photoresist Stripping Replacement for Flex Circuit Fabrication  

SciTech Connect

A replacement conveyorized photoresist stripping system was characterized to replace the ASI photoresist stripping system. This system uses the qualified ADF-25c chemistry for the fabrication of flex circuits, while the ASI uses the qualified potassium hydroxide chemistry. The stripping process removes photoresist, which is used to protect the copper traces being formed during the etch process.

Megan Donahue

2009-02-24T23:59:59.000Z

439

Evolutionary algorithms for the physical design of VLSI circuits  

Science Conference Proceedings (OSTI)

Electronic design automation (EDA) is concerned with the design and production of VLSI systems. One of the important steps in creating a VLSI circuit is physical design. The input to the physical design step is a logical representation of the system ...

James Cohoon; John Karro; Jens Lienig

2003-01-01T23:59:59.000Z

440

Analog circuit test based on a digital signature  

Science Conference Proceedings (OSTI)

Production verification of analog circuit specifications is a challenging task requiring expensive test equipment and time consuming procedures. This paper presents a method for low cost on-chip parameter verification based on the analysis of a digital ... Keywords: mixed-signal test, monitoring, nonlinear zone boundary, specification verification

A. Gómez; R. Sanahuja; L. Balado; J. Figueras

2010-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

Automation Schemes for FPGA Implementation of Wave-Pipelined Circuits  

Science Conference Proceedings (OSTI)

Operating frequencies of combinational logic circuits can be increased using Wave-Pipelining (WP), by adjusting the clock periods and clock skews. In this article, Built-In Self-Test (BIST) and System-on-Chip (SOC) approaches are proposed for automating ... Keywords: CORDIC, DAA, FPGA, SOC, pipelining, wave-pipelining

G. Seetharaman; B. Venkataramani

2009-06-01T23:59:59.000Z

442

Compensated count-rate circuit for radiation survey meter  

DOE Patents (OSTI)

A count-rate compensating circuit is provided which may be used in a portable Geiger-Mueller (G-M) survey meter to ideally compensate for couting loss errors in the G-M tube detector. In a G-M survey meter, wherein the pulse rate from the G-M tube is converted into a pulse rate current applied to a current meter calibrated to indicate dose rate, the compensation circuit generates and controls a reference voltage in response to the rate of pulses from the detector. This reference voltage is gated to the current-generating circuit at a rate identical to the rate of pulses coming from the detector so that the current flowing through the meter is varied in accordance with both the frequency and amplitude of the reference voltage pulses applied thereto so that the count rate is compensated ideally to indicate a true count rate within 1% up to a 50% duty cycle for the detector. A positive feedback circuit is used to control the reference voltage so that the meter output tracks true count rate indicative of the radiation dose rate.

Todd, R.A.

1980-05-12T23:59:59.000Z

443

HEATS: Thermal Energy Storage  

SciTech Connect

HEATS Project: The 15 projects that make up ARPA-E’s HEATS program, short for “High Energy Advanced Thermal Storage,” seek to develop revolutionary, cost-effective ways to store thermal energy. HEATS focuses on 3 specific areas: 1) developing high-temperature solar thermal energy storage capable of cost-effectively delivering electricity around the clock and thermal energy storage for nuclear power plants capable of cost-effectively meeting peak demand, 2) creating synthetic fuel efficiently from sunlight by converting sunlight into heat, and 3) using thermal energy storage to improve the driving range of electric vehicles (EVs) and also enable thermal management of internal combustion engine vehicles.

None

2012-01-01T23:59:59.000Z

444

Dynamic behaviour of a DFIG wind turbine subjected to power system faults  

E-Print Network (OSTI)

Dynamic behaviour of a DFIG wind turbine subjected to power system faults Gabriele Michalke+, Anca of the dynamic interaction between variable speed DFIG wind turbines and the power system subjected to disturbances, such as short circuit faults. Focus of the paper is the fault ride-through capability of DFIG

445

Thermal conductance and rectification of asymmetric tilt grain boundary in graphene  

E-Print Network (OSTI)

We have investigated the lattice thermal transport across the asymmetry tilt grain boundary between armchair and zigzag grains by using nonequilibrium molecular dynamics (NEMD). We have observed significant temperature drop and ultralow temperature-dependent thermal boundary resistance. Importantly, we find an unexpected thermal rectification phenomenon, i.e, the thermal conductivity and Kapitza conductance is asymmetric with respect to the thermal transport direction. And the effect of thermal rectification could be amplified by increasing the difference of temperature imposed on two sides. Our results propose a new promising kind of thermal rectifier and phonon diodes from polycrystalline graphene without delicate manupulation of the atomic structures.

Cao, Hai-Yuan; Gong, Xin-Gao

2011-01-01T23:59:59.000Z

446

Turbulence Structure of the Convective Boundary Layer. Part III: The Vertical Velocity Budgets of Thermals and Their Environment  

Science Conference Proceedings (OSTI)

The dynamics of thermal updrafts and compensating environmental downdrafts in the convective boundary layer are examined using observations from the Phoenix 78 field experiment. Separate vertical velocity budgets are presented for thermal ...

George S. Young

1988-07-01T23:59:59.000Z

447

Design as you see FIT: system-level soft error analysis of sequential circuits  

Science Conference Proceedings (OSTI)

Soft errors in combinational and sequential elements of digital circuits are an increasing concern as a result of technology scaling. Several techniques for gate and latch hardening have been proposed to synthesize circuits that are tolerant to soft ...

Daniel Holcomb; Wenchao Li; Sanjit A. Seshia

2009-04-01T23:59:59.000Z

448

Global Circuit Response to Seasonal Variations in Global Surface Air Temperature  

Science Conference Proceedings (OSTI)

Comparisons are made between the seasonal behavior of the global electrical circuit and the surface air temperature for the Tropics and for the globe. Positive correlations between global circuit parameters and temperature are identified on both ...

Earle R. Williams

1994-08-01T23:59:59.000Z

449

A pragmatic approach to integrated process/device/circuit simulation for IC technology development  

Science Conference Proceedings (OSTI)

A novel approach to integrated process/device/circuit simulation is proposed which allows pragmatic, computationally efficient IC technology CAD at the mixed-mode device/circuit level. The approach is demonstrated with a simulation system for advanced ...

K. R. Green; J. G. Fossum

2006-11-01T23:59:59.000Z

450

A retrofit 60 Hz current sensor for non-intrusive power monitoring at the circuit breaker  

E-Print Network (OSTI)

We present a new sensor for power monitoring that measures current flow in a circuit breaker without permanent modification of the breaker panel or the circuit breaker itself. The sensor consists of three parts: an inductive ...

Clifford, Zachary

451

A retrot current sensor for non-intrusive power monitoring at the circuit breaker  

E-Print Network (OSTI)

This thesis presents a new sensor for power monitoring that measures current flow in a circuit breaker without permanent modification of the breaker panel or the circuit breaker itself. At the breaker panel, an inductive ...

Vickery, Daniel Robert

2011-01-01T23:59:59.000Z

452

Experimental evidence for vibrational resonance and enhanced signal transmission in Chua's circuit  

E-Print Network (OSTI)

We consider a single Chua's circuit and a system of a unidirectionally coupled n-Chua's circuits driven by a biharmonic signal with two widely different frequencies \\omega and \\Omega, where \\Omega >> \\omega. We show experimental evidence for vibrational resonance in the single Chua's circuit and undamped signal propagation of a low-frequency signal in the system of n-coupled Chua's circuits where only the first circuit is driven by the biharmonic signal. In the single circuit, we illustrate the mechanism of vibrational resonance and the influence of the biharmonic signal parameters on the resonance. In the n(= 75)-coupled Chua's circuits enhanced propagation of low-frequency signal is found to occur for a wide range of values of the amplitude of the high-frequency input signal and coupling parameter. The response amplitude of the ith circuit increases with i and attains a saturation. Moreover, the unidirectional coupling is found to act as a low-pass filter.

R. Jothimurugan; K. Thamilmaran; S. Rajasekar; M. A. F. Sanjuan

2013-08-12T23:59:59.000Z

453

A batteryless thermoelectric energy-harvesting interface circuit with 35mV startup voltage  

E-Print Network (OSTI)

A batteryless thermoelectric energy-harvesting interface circuit to extract electrical energy from human body heat is implemented in a 0.35 ?m [mu m] CMOS process. A mechanically assisted startup circuit enables operation ...

Ramadass, Yogesh Kumar

454

Equivalent electric circuit modeling of differential structures in PCB with genetic algorithm  

Science Conference Proceedings (OSTI)

This paper introduces an equivalent circuit extraction technique for differential structures using a hybrid genetic algorithm. The procedure searches for the proper parameters of lumped circuit elements to fit the scattering parameters which can be obtained ...

Jong Kang Park; Yong Ki Byun; Jong Tae Kim

2006-10-01T23:59:59.000Z

455

Injection compression modeling of non-linear positive temperature coefficient circuit protection devices  

E-Print Network (OSTI)

Polymeric self-resettable circuit protection devices have been manufactured for many years with an extrusion based process. These devices add negligible resistance to a circuit at normal power operating conditions but ...

Hardy, Joseph T., 1978-

2005-01-01T23:59:59.000Z

456

Design and test rules for CMOS circuits to facilitate IDDQ testing of bridging faults  

Science Conference Proceedings (OSTI)

All possible bridging faults (BFs) between any two circuit nodes are considered, where a circuit node may be the drain, source, or gate terminal of a transistor. Several examples are given to show that under certain circumstances current supply monitoring ...

K. -J. Lee; M. A. Breuer

2006-11-01T23:59:59.000Z

457

A graph grammar based approach to automated multi-objective analog circuit design  

Science Conference Proceedings (OSTI)

This paper introduces a graph grammar based approach to automated topology synthesis of analog circuits. A grammar is developed to generate circuits through production rules, that are encoded in the form of a derivation tree. The synthesis has been sped ...

Angan Das; Ranga Vemuri

2009-04-01T23:59:59.000Z

458

Extraction of Piecewise-Linear Analog Circuit Models from Trained Neural Networks Using Hidden Neuron Clustering  

Science Conference Proceedings (OSTI)

This paper presents a new technique for automatically creating analog circuit models. The method extracts - from trained neural networks - piecewise linear models expressing the linear dependencies between circuit performances and design parameters. ...

Simona Doboli; Gaurav Gothoskar; Alex Doboli

2003-03-01T23:59:59.000Z

459

Oscillatory thermal instability - the Bhopal disaster and liquid bombs  

E-Print Network (OSTI)

Thermal runaway reactions were involved in the Bhopal disaster of 1984, in which methyl isocyanate was vented from a storage tank of the liquid, and occur in liquid peroxide explosions, yet to date there have been few investigations into the mechanism of thermal runaway in such liquid thermoreactive systems. Consequently protocols for storing thermally unstable liquids and deactivating liquid bombs may be suboptimal. In this work the hydrolysis of methyl isocyanate and the thermal decomposition of triacetone triperoxide were simulated using a gradientless, continuous-flow reactor paradigm. This approximation enabled stability analyses on the steady state solutions of the dynamical mass and enthalpy equations. The results indicate that thermal runaway in both systems is due to the onset of a large amplitude, hard thermal oscillation initiated at a subcritical Hopf bifurcation. This type of thermal misbehaviour cannot be predicted using classical ignition theory, and may be typical of liquid thermoreactive syst...

Ball, Rowena

2011-01-01T23:59:59.000Z

460

Field Guide: Lubrication of High-Voltage Circuit Breakers - 2013 Update  

Science Conference Proceedings (OSTI)

High-voltage circuit breakers (HVCBs) perform essential protection and control functions on power transmission networks. Circuit breaker mechanisms have multiple components that must operate in concert in order for the breaker to perform properly. If one component does not operate correctly, the circuit breaker may mis-operate or fail. A circuit breaker mis-operation may cause equipment damage and outages—both expensive consequences. Proper lubrication ...

2013-12-19T23:59:59.000Z

Note: This page contains sample records for the topic "dynamic thermal circuit" 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

User`s guide and physics manual for the SCATPlus circuit code  

SciTech Connect

ScatPlus is a user friendly circuit code and an expandable library of circuit models for electrical components and devices; it can be used to predict the transient behavior in electric circuits. The heart of ScatPlus is the transient circuit solver SCAT written in 1986 by R.F. Gribble. This manual includes system requirements, physics manual, ScatPlus component library, tutorial, ScatPlus screen, menus and toolbar, ScatPlus tool bar, procedures.

Yapuncich, M.L.; Deninger, W.J.; Gribble, R.F.

1994-05-09T23:59:59.000Z

462

Particle sorter comprising a fluid displacer in a closed-loop fluid circuit  

SciTech Connect

Disclosed herein are methods and devices utilizing a fluid displacer in a closed-loop fluid circuit.

Perroud, Thomas D. (San Jose, CA); Patel, Kamlesh D. (Dublin, CA); Renzi, Ronald F. (Tracy, CA)

2012-04-24T23:59:59.000Z

463

Thermal contact resistance  

E-Print Network (OSTI)

This work deals with phenomena of thermal resistance for metallic surfaces in contact. The main concern of the work is to develop reliable and practical methods for prediction of the thermal contact resistance for various ...

Mikic, B. B.

1966-01-01T23:59:59.000Z

464

Integrated circuit implementation of multi-dimensional piecewise-linear functions  

Science Conference Proceedings (OSTI)

In this paper we present an integrated circuit implementing piecewise-linear (PWL) functions with three inputs, where each input can be either analog or digital. The PWL function to be implemented can be chosen by properly storing a set of coefficients ... Keywords: Embedded, Integrated circuit, Nonlinear circuit, Piecewise-linear

Martin Di Federico; Tomaso Poggi; Pedro Julián; Marco Storace

2010-12-01T23:59:59.000Z

465

A SVDD approach of fuzzy classification for analog circuit fault diagnosis with FWT as preprocessor  

Science Conference Proceedings (OSTI)

In this paper, a new approach of fault diagnosis in analog circuits, which employs the Fractional Wavelet Transform (FWT) to extract fault features and adopts a fuzzy multi-classifier based on the Support Vector Data Description (SVDD) to diagnose circuit ... Keywords: Analog circuit, Fault diagnosis, Feature extraction, Fractional wavelet transform, KFCM, SVDD

Hui Luo; Youren Wang, Jiang Cui

2011-08-01T23:59:59.000Z

466

A New Operational Tests Circuit for Testing ±660kV UHVDC Thyristor Valves  

Science Conference Proceedings (OSTI)

Operational test is an important measure which can guarantee safe and stable operation of UHVDC thyristor valves. HVDC thyristor modules can be performed either in a six-pulse back-to-back test circuit or in a synthetic test circuit. UHVDC thyristor ... Keywords: HVDC thyristor valve, operational tests, synthetic test circuit

Ting Xie; Tang Guang-fu; Zha Kun-peng; Gao Chong

2010-06-01T23:59:59.000Z

467

A novel piezoelectric energy harvester designed for single-supply pre-biasing circuit  

E-Print Network (OSTI)

A novel piezoelectric energy harvester designed for single- supply pre-biasing circuit N Mohammad printed piezoelectric energy harvester for the single-supply pre-biasing (SSPB) circuit is presented that the single-supply pre-biasing (SSPB) circuit is the most suitable for low amplitude energy harvesting

468

The analysis of circuit breakers kinematics characteristics using the artificial neural networks  

Science Conference Proceedings (OSTI)

The paper presents the required parameters in the evaluation of the technical state for the High Voltage (HV) circuit breakers. It details some aspects regarding the influence of the kinematics characteristics to the circuit breakers performances. Also, ... Keywords: artificial neural network, circuit breaker, diagnostic, kinematics characteristics, modelling and simulation, monitoring

Maricel Adam; Adrian Baraboi; Catalin Pancu; Sorin Pispiris

2009-02-01T23:59:59.000Z

469

Simulation-based automatic generation of signomial and posynomial performance models for analog integrated circuit sizing  

Science Conference Proceedings (OSTI)

This paper presents a method to automatically generate posynomial response surface models for the performance parameters of analog integrated circuits. The posynomial models enable the use of efficient geometric programming techniques for circuit sizing ... Keywords: analog circuit modeling, design of experiments, geometric programming, posynomial and signomial response surface modeling

Walter Daems; Georges Gielen; Willy Sansen

2001-11-01T23:59:59.000Z

470

Thermal and Electrical Transport in Oxide Heterostructures  

E-Print Network (OSTI)

of thermal conductivity . . . . . . . . . . . . . . . .4.4 Thermal transport in2.3.2 Thermal transport . . . . . . . . . . . . . . . .

Ravichandran, Jayakanth

2011-01-01T23:59:59.000Z

471

Thermal Spray Coatings  

Science Conference Proceedings (OSTI)

Table 35   Thermal spray coatings used for hardfacing applications...piston ring (internal combustion);

472

Plasma-Thermal Synthesis  

INL’s Plasma-Thermal Synthesis process improves the conversion process for natural gas into liquid hydrocarbon fuels.

473

Ocean Thermal Energy Conversion  

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

A process called ocean thermal energy conversion (OTEC) uses the heat energy stored in the Earth's oceans to generate electricity.

474

Nanocomposite Thermal Spray Coatings.  

Science Conference Proceedings (OSTI)

Long-Term Surface Restoration Effect Introduced by Advanced Lubricant Additive · Nanocomposite Thermal Spray Coatings. New Hardfacing Overlay Claddings ...

475

Thermal Management of Solar Cells  

E-Print Network (OSTI)

phonon transmission and interface thermal conductance acrossF. Miao, et al. , "Superior Thermal Conductivity of Single-Advanced Materials for Thermal Management of Electronic

Saadah, Mohammed Ahmed

2013-01-01T23:59:59.000Z

476

Prospects for Strong Cavity Quantum Electrodynamics with Superconducting Circuits  

E-Print Network (OSTI)

We propose a realizable architecture using one-dimensional transmission line resonators to reach the strong coupling limit of cavity quantum electrodynamics in superconducting electrical circuits. The vacuum Rabi frequency for the coupling of cavity photons to quantized excitations of an adjacent electrical circuit (qubit) can easily exceed the damping rates of both the cavity and the qubit. This architecture is attractive for quantum computing and control, since it provides strong inhibition of spontaneous emission, potentially leading to greatly enhanced qubit lifetimes, allows high-fidelity quantum non-demolition measurements of the state of multiple qubits, and has a natural mechanism for entanglement of qubits separated by centimeter distances. In addition it would allow production of microwave photon states of fundamental importance for quantum communication.

S. M. Girvin; Ren-Shou Huang; Alexandre Blais; Andreas Wallraff; R. J. Schoelkopf

2003-10-28T23:59:59.000Z

477

Methods for improving solar cell open circuit voltage  

DOE Patents (OSTI)

A method for producing a solar cell having an increased open circuit voltage. A layer of cadmium sulfide (CdS) produced by a chemical spray technique and having residual chlorides is exposed to a flow of hydrogen sulfide (H.sub.2 S) heated to a temperature of 400.degree.-600.degree. C. The residual chlorides are reduced and any remaining CdCl.sub.2 is converted to CdS. A heterojunction is formed over the CdS and electrodes are formed. Application of chromium as the positive electrode results in a further increase in the open circuit voltage available from the H.sub.2 S-treated solar cell.

Jordan, John F. (El Paso, TX); Singh, Vijay P. (El Paso, TX)

1979-01-01T23:59:59.000Z

478

Declarative Combinatorics: Boolean Functions, Circuit Synthesis and BDDs in Haskell  

E-Print Network (OSTI)

We describe Haskell implementations of interesting combinatorial generation algorithms with focus on boolean functions and logic circuit representations. First, a complete exact combinational logic circuit synthesizer is described as a combination of catamorphisms and anamorphisms. Using pairing and unpairing functions on natural number representations of truth tables, we derive an encoding for Binary Decision Diagrams (BDDs) with the unique property that its boolean evaluation faithfully mimics its structural conversion to a a natural number through recursive application of a matching pairing function. We then use this result to derive ranking and unranking functions for BDDs and reduced BDDs. Finally, a generalization of the encoding techniques to Multi-Terminal BDDs is provided. The paper is organized as a self-contained literate Haskell program, available at http://logic.csci.unt.edu/tarau/research/2008/fBDD.zip . Keywords: exact combinational logic synthesis, binary decision diagrams, encodings of boolea...

Tarau, Paul

2008-01-01T23:59:59.000Z

479

Thermal neutron detection system  

DOE Patents (OSTI)

According to the present invention, a system for measuring a thermal neutron emission from a neutron source, has a reflector/moderator proximate the neutron source that reflects and moderates neutrons from the neutron source. The reflector/moderator further directs thermal neutrons toward an unmoderated thermal neutron detector.

Peurrung, Anthony J. (Richland, WA); Stromswold, David C. (West Richland, WA)

2000-01-01T23:59:59.000Z

480

Internal Short Circuit Device Helps Improve Lithium-Ion ...  

result in the cells getting very hot, in extreme cases cells go into thermal runaway, igniting the device in which they are installed.

Note: This page contains sample records for the topic "dynamic thermal circuit" 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.


481

Personnel Protection Systems for Electric Vehicle Charging Circuits  

Science Conference Proceedings (OSTI)

Electric vehicle charging systems will be required to provide protection against electric shock due to ground faults. This report reviews the subject of electric shock, including the effects of current magnitude, frequency, duration, alternating and direct current, and supply voltage to ground. The report suggests a basis for specific safety requirements--such as a ground fault circuit interrupt--that can be included in a product safety standard covering electric vehicle charging systems to meet the 1996...

2000-01-05T23:59:59.000Z

482

Basic DC Meter Design ECE 2100 Circuit Analysis Laboratory  

E-Print Network (OSTI)

Basic DC Meter Design ECE 2100 Circuit Analysis Laboratory updated 8 January 2008 Pre-Laboratory Assignment 1. Design an ammeter with full scale current IFS equal to 5 mA using a meter movement rated at 0.5 mA and 100 mV. 2. Design a voltmeter with a full scale voltage VFS equal to 10 V using the meter

Miller, Damon A.

483

A scalable virtual circuit routing scheme for ATM networks  

Science Conference Proceedings (OSTI)

Abstract: We present a scalable VC routing protocol based on the viewserver hierarchy. Each viewserver maintains a partial view of the network. By querying these viewservers, a source obtains a merged view that contains a path to the destination. The ... Keywords: ATM networks, asynchronous transfer mode, blocking probability, destination, packet switching networks, real-time workload, scalable VC routing protocol, scalable virtual circuit routing, setup request packet, simulation, source, storage, viewserver hierarchy

1995-09-01T23:59:59.000Z

484

Reversing-counterpulse repetitive-pulse inductive storage circuit  

DOE Patents (OSTI)

A high-power reversing-counterpulse repetitive-pulse inductive storage and transfer circuit includes an opening switch, a main energy storage coil, a counterpulse capacitor and a small inductor. After counterpulsing the opening switch off, the counterpulse capacitor is recharged by the main energy storage coil before the load pulse is initiated. This gives the counterpulse capacitor sufficient energy for the next counterpulse operation, although the polarity of the capacitor's voltage must be reversed before that can occur. By using a current-zero switch as the counterpulse start switch, the capacitor is disconnected from the circuit (with a full charge) when the load pulse is initiated, preventing the capacitor from depleting its energy store by discharging through the load. After the load pulse is terminated by reclosing the main opening switch, the polarity of the counterpulse capacitor voltage is reversed by discharging the capacitor through a small inductor and interrupting the discharge current oscillation at zero current and peak reversed voltage. The circuit enables high-power, high-repetition-rate operation with reusable switches and features total control (pulse-to-pulse) over output pulse initiation, duration, repetition rate, and, to some extent, risetime. 10 figs.

Honig, E.M.

1987-02-10T23:59:59.000Z

485

Reversing-counterpulse repetitive-pulse inductive storage circuit  

DOE Patents (OSTI)

A high-power reversing-counterpulse repetitive-pulse inductive storage and transfer circuit includes an opening switch, a main energy storage coil, a counterpulse capacitor and a small inductor. After counterpulsing the opening switch off, the counterpulse capacitor is recharged by the main energy storage coil before the load pulse is initiated. This gives the counterpulse capacitor sufficient energy for the next counterpulse operation, although the polarity of the capacitor's voltage must be reversed before that can occur. By using a current-zero switch as the counterpulse start switch, the capacitor is disconnected from the circuit (with a full charge) when the load pulse is initiated, preventing the capacitor from depleting its energy store by discharging through the load. After the load pulse is terminated by reclosing the main opening switch, the polarity of the counterpulse capacitor voltage is reversed by discharging the capacitor through a small inductor and interrupting the discharge current oscillation at zero current and peak reversed voltage. The circuit enables high-power, high-repetition-rate operation with reusable switches and features total control (pulse-to-pulse) over output pulse initiation, duration, repetition rate, and, to some extent, risetime.

Honig, Emanuel M. (Los Alamos, NM)

1987-01-01T23:59:59.000Z

486

Short Circuit Current Contribution for Different Wind Turbine Generator Types  

DOE Green Energy (OSTI)

An important aspect of wind power plant (WPP) impact studies is to evaluate the short circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper represents simulation results for short circuit current contribution for different types of WTGs obtained through transient analysis using generic WTG models. The obtained waveforms are analyzed to explain the behavior, such as peak values and rate of decay, of the WTG. The effect of fault types and location, and the effect of the control algorithms of power converters on SC current contribution are investigated. It is shown that the response of the WPP to faults will vary based on the type of the installed WTGs. While in Type 1 and Type 2 WTGs, short circuit current will be determined by the physical characteristics of the induction generator, the contribu-tion of Type 3 and Type 4 WTG will be mostly characterized by the power converters control algorithms which are usually considered proprietary information by the wind turbine manufacturers.

Muljadi, E.; Samaan, Nader A.; Gevorgian, Vahan; Li, Jun; Pasupulati, Subbaiah

2010-09-28T23:59:59.000Z

487

Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit  

DOE Patents (OSTI)

A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radio nuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components.

McQuaid, James H. (Livermore, CA); Lavietes, Anthony D. (Hayward, CA)

1998-05-29T23:59:59.000Z

488

Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit  

DOE Patents (OSTI)

A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector is disclosed. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radionuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components. 9 figs.

McQuaid, J.H.; Lavietes, A.D.

1998-05-26T23:59:59.000Z

489

Automatic detection of changes in the dynamics of delayed stochastic gene networks and in vivo production of RNA molecules in Escherichia coli  

Science Conference Proceedings (OSTI)

Motivation: Production and degradation of RNA and proteins are stochastic processes, difficulting the distinction between spurious fluctuations in their numbers and changes in the dynamics of a genetic circuit. An accurate method of change detection ...

Jarno Mäkelä; Heikki Huttunen; Meenakshisundaram Kandhavelu; Olli Yli-Harja; Andre S. Ribeiro

2011-10-01T23:59:59.000Z

490

Modeling and control of a cascaded doubly-fed induction generator based on dynamical equivalent circuits  

Science Conference Proceedings (OSTI)

This paper deals with the control of an autonomous cascaded doubly-fed induction generator operating in a variable speed constant frequency mode. The proposed structure is a full stand-alone generating system dedicated to isolated grids in embedded systems ... Keywords: Aircraft applications, Cascaded doubly-fed induction generator, Isolated grid, Modeling, Control, Topology analysis, Variable speed constant frequency

N. Patin; E. Monmasson; J. -P. Louis

2010-10-01T23:59:59.000Z

491

Plenary lecture 7: circuit analysis to natural resources and environmental economic dynamics and control  

Science Conference Proceedings (OSTI)

This study extends to the natural resource and environmental economics the use of the conventionalcircuit analysis and control in engineering. Resources and environmental management problemsare investigated with help of continuous-time and discrete-time ...

Andre A. Keller

2010-11-01T23:59:59.000Z

492

Thermal Storage Systems at IBM Facilities  

E-Print Network (OSTI)

In 1979, IBM commissioned its first large scale thermal storage system with a capacity of 2.7 million gallons of chilled water and 1.2 million gallons of reclaimed, low temperature hot water. The stored cooling energy represents approximately 27,000 ton hours. Through reduced chiller plant capacity and annual operating cost savings in primarily electric demand charges the payback will be approximately 3 1/2 years. The water is stored in multiple, insulated tanks, located above the ground. A similar but smaller system at IBM's Charlotte, North Carolina plant has no provisions for heat reclaim. Instead, it uses cooling tower water directly in the chilled water circuit when outside conditions permit. This paper presents system designs, control modes and economic considerations and describes IBM's experience to date with large volume storage systems.

Koch, G.

1981-01-01T23:59:59.000Z

493

Heat transfer dynamics  

Science Conference Proceedings (OSTI)

As heat transfer technology increases in complexity, it becomes more difficult for those without thermal dynamics engineering training to choose between competitive heat transfer systems offered to meet their drying requirements. A step back to the basics of heat transfer can help professional managers and papermakers make informed decisions on alternative equipment and methods. The primary forms of heat and mass transfer are reviewed with emphasis on the basics, so a practical understanding of each is gained. Finally, the principles and benefits of generating infrared energy by combusting a gaseous hydrocarbon fuel are explained.

Smith, T.M. (Marsden, Inc., Pennsauken, NJ (United States))

1994-08-01T23:59:59.000Z

494

Building Energy Software Tools Directory: Thermal Comfort  

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

Thermal Comfort Thermal Comfort logo. Provides a user-friendly interface for calculating thermal comfort parameters and making thermal comfort predictions using several thermal...

495

Docket No. EO-05-01: Further Notice of 230kV Circuit Planned Outages |  

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

Further Notice of 230kV Circuit Planned Further Notice of 230kV Circuit Planned Outages Docket No. EO-05-01: Further Notice of 230kV Circuit Planned Outages Docket No. EO-05-01. Pursuant to the United States Department of Energy Order No. 202-05-03, issued December 20, 2005 directing Mirant Potomac River to generate electricity at Potomac River Generating Station, PEPCO hereby files this Further Notice of 230kV Circuit Planned Outages. Docket No. EO-05-01: Further Notice of 230kV Circuit Planned Outages More Documents & Publications Further Notice of 230kV Circuit Planned Outages Re: Potomac River Generating Station Department of Energy, Case No. EO-05-01: Potomac Electric Power Company (PEPCO) Concerning Planned Outages of the 230 kV circuits Re: Potomac River Generating Station Department of Energy Case No.

496

Further Notice of 230kV Circuit Planned Outages | Department of Energy  

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

Further Notice of 230kV Circuit Planned Outages Further Notice of 230kV Circuit Planned Outages Further Notice of 230kV Circuit Planned Outages Docket No. EO-05-01. Order No. 202-05-03: Pursuant 10 the United States Department of Energy "DOE") Order No. 102-05-3, issued December 20, 2005 ("DOE Potomac River Order''), Pepco hereby files this Further Notice Of 230kV Circuit Planned Outages serving the Potomac River Substation, and through thaI station, the District of Columbia. Further Notice of 230kV Circuit Planned Outages More Documents & Publications Re: Potomac River Generating Station Department of Energy, Case No. EO-05-01: Potomac Electric Power Company (PEPCO) Concerning Planned Outages of the 230 kV circuits Docket No. EO-05-01: Further Notice of 230kV Circuit Planned Outages

497

Object-Oriented Modeling Of Power-Electronic Circuits Using Dymola  

E-Print Network (OSTI)

In this paper, a new approach to the object--oriented modeling of power--electronic circuits is demonstrated. It enables the user to specify power--electronic circuits conveniently in an easy--to--use modular fashion, yet generate simulation code that is efficient in its use, not requiring the introduction of artificial fast time--constants as was the case with many of the earlier proposed methodologies. Dymola enables the user to specify models for individual circuit elements in a highly modular, compact, and object--oriented fashion. Circuit models invoke these component models, and connect them in a topological manner, just as a Spice program would. The Dymola compiler automatically translates these circuit models into monolithic descriptions at the level of the simulation language resolving discontinuous circuit elements, such as switches, into appropriate event descriptions. For a typical AC--DC converter circuit controlled by GTO thyristors, it is shown that a speedup factor of a...

Hilding Elmqvist; François E. Cellier; Martin Otter

1994-01-01T23:59:59.000Z

498

Further Notice of 230kV Circuit Planned Outages | Department of Energy  

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

Further Notice of 230kV Circuit Planned Outages Further Notice of 230kV Circuit Planned Outages Further Notice of 230kV Circuit Planned Outages Docket No. EO-05-01. Order No. 202-05-03: Pursuant 10 the United States Department of Energy "DOE") Order No. 102-05-3, issued December 20, 2005 ("DOE Potomac River Order''), Pepco hereby files this Further Notice Of 230kV Circuit Planned Outages serving the Potomac River Substation, and through thaI station, the District of Columbia. Further Notice of 230kV Circuit Planned Outages More Documents & Publications Docket No. EO-05-01: Further Notice of 230kV Circuit Planned Outages Re: Potomac River Generating Station Department of Energy, Case No. EO-05-01: Potomac Electric Power Company (PEPCO) Concerning Planned Outages of the 230 kV circuits

499

Dislocation Dynamics  

Science Conference Proceedings (OSTI)

Mar 7, 2013 ... Recent Progress in Dislocation Dynamics: Sylvie Aubry1; Athanasios Arsenlis1; Wei Cai2; Steve Fitzgerald3; 1LLNL; 2Stanford University; ...

500

Integrated Thermal Analysis of the FRIB Cryomodule Design  

SciTech Connect

Thermal analysis of the FRIB cryomodule design is performed to determine the heat load to the cryogenic plant, to minimize the cryogenic plant load, to simulate thermal shield cool down as well as to determine the pressure relief sizes for failure conditions. Static and dynamic heat loads of the cryomodules are calculated and the optimal shield temperature is determined to minimize the cryogenic plant load. Integrated structural and thermal simulations of the 1100-O aluminium thermal shield are performed to determine the desired cool down rate to control the temperature profile on the thermal shield and to minimize thermal expansion displacements during the cool down. Pressure relief sizing calculations for the SRF helium containers, solenoids, helium distribution piping, and vacuum vessels are also described.

Y. Xu, M. Barrios, F. Casagrande, M.J. Johnson, M. Leitner, D. Arenius, V. Ganni, W.J. Schneider, M. Wiseman

2012-07-01T23:59:59.000Z