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1

Load flow analysis: Base cases, data, diagrams, and results  

SciTech Connect (OSTI)

This report describes how an electric utility system is modeled by using load flow techniques to establish a validated power flow case suitable for simulating and evaluating alternative system scenarios. Details of the load flow model are supported by additional technical and descriptive information intended to correlate modeled electrical system parameters with the corresponding physical equipment that makes up the system. Pictures and technical specifications of system equipment from the utility, public, or vendor are provided to support this association for many system components. The report summarizes the load flow model construction, simulation, and validation and describes the general capabilities of an information query system designed to access load flow parameters and other electrical system information.

Portante, E.C.; Kavicky, J.A.; VanKuiken, J.C.; Peerenboom, J.P.

1997-10-01T23:59:59.000Z

2

Transaction Based Power Flow Analysis For Transmission Utilization Allocation  

E-Print Network [OSTI]

transactions as well as the effect of reactive power on transmission losses and active power flows. Two the electric power industry moves into an era of supply competition and consumer choice, the power system electricity market at the ex ante phase; (ii) MW generations are decided by bilateral contracts and other

3

Near-Infrared Detection of Flow Injection Analysis by Acoustooptic Tunable Filter-Based  

E-Print Network [OSTI]

Near-Infrared Detection of Flow Injection Analysis by Acoustooptic Tunable Filter University, P.O. Box 1881, Milwaukee, Wisconsin 53201-1881 The instrumentation development of a near-infrared organic compounds absorb light in the near-infrared region, this AOTF-based near-IR detector can serve

Reid, Scott A.

4

Study of vaneless diffuser rotating stall based on two-dimensional inviscid flow analysis  

SciTech Connect (OSTI)

Rotating stalls in vaneless diffusers are studied from the viewpoint that they are basically two-dimensional inviscid flow instability under the boundary conditions of vanishing velocity disturbance at the diffuser inlet and of vanishing pressure disturbance at the diffuser outlet. The linear analysis in the present report shows that the critical flow angle and the propagation velocity are functions of only the diffuser radius ratio. It is shown that the present analysis can reproduce most of the general characteristics observed in experiments: critical flow angle, propagation velocity, velocity, and pressure disturbance fields. It is shown that the vanishing velocity disturbance at the diffuser inlet is caused by the nature of impellers as a resistance and an inertial resistance, which is generally strong enough to suppress the velocity disturbance at the diffuser inlet. This explains the general experimental observations that vaneless diffuser rotating stalls are not largely affected by the impeller.

Tsujimoto, Yoshinobu; Yoshida, Yoshiki [Osaka Univ., Toyonaka, Osaka (Japan); Mori, Yasumasa [Mitsubishi Motors Corp., Ohta, Tokyo (Japan)

1996-03-01T23:59:59.000Z

5

Improving Surge Flow Irrigation Efficiency Based on Analysis of Infiltration and Hydrodynamic Effects  

E-Print Network [OSTI]

areas were: a) development of a surge flow infiltration model; b) the effect Or wetted perimeter on infiltration in furrow; c) design, construction, and calibration of a physical model of an irrigation border/furrow; and d) development of a surge flow...

Smerdon, Ernest T.; Blair, Allie W.

6

ANUDlSiTM-40 Load Flow Analysis: Base Cases, Data, Diagrams, and Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered¬ČPNGExperience4AJ01) (See95TI07)Operations2 Print258DepartmentANUDlSiTM-40 Load Flow

7

Automation of radiochemical analysis by applying flow  

E-Print Network [OSTI]

of detection systems, including scintillation counting, a-spectrometers, proportional counters, mass spectrometry and spectrophotometry. ™ 2010 Published by Elsevier Ltd. Keywords: Flow-analysis technique; Flow

SŠnchez, David

8

Analysis of flow patterns and flow mechanisms in soils  

E-Print Network [OSTI]

Analysis of flow patterns and flow mechanisms in soils Dissertation Co-directed by the University of paths, varying flow mechanism or changing soil physical properties (stratification). Thus, in stratified-28Jan2010 #12;This doctoral thesis was prepared at the Department of Soil Physics, University

Paris-Sud XI, Université de

9

Analysis of flow patterns and flow mechanisms in soils  

E-Print Network [OSTI]

Analysis of flow patterns and flow mechanisms in soils Dissertation Co-directed by the University mechanism or changing soil physical properties (stratification). Thus, in stratified soil, we restricted was prepared at the Department of Soil Physics, University of Bayreuth, and at the Hydrogeological Laboratory

Avignon et des Pays de Vaucluse, Université de

10

Fluid Gravity Engineering Rocket motor flow analysis  

E-Print Network [OSTI]

Fluid Gravity Engineering Capability · Rocket motor flow analysis -Internal (performance) -External young scientists/engineers Fluid Gravity Engineering Ltd #12;

Anand, Mahesh

11

A study of grout flow pattern analysis  

SciTech Connect (OSTI)

A new disposal unit, designated as Salt Disposal Unit no. 6 (SDU6), is being designed for support of site accelerated closure goals and salt nuclear waste projections identified in the new Liquid Waste System plan. The unit is cylindrical disposal vault of 380 ft diameter and 43 ft in height, and it has about 30 million gallons of capacity. Primary objective was to develop the computational model and to perform the evaluations for the flow patterns of grout material in SDU6 as function of elevation of grout discharge port, and slurry rheology. A Bingham plastic model was basically used to represent the grout flow behavior. A two-phase modeling approach was taken to achieve the objective. This approach assumes that the air-grout interface determines the shape of the accumulation mound. The results of this study were used to develop the design guidelines for the discharge ports of the Saltstone feed materials in the SDU6 facility. The focusing areas of the modeling study are to estimate the domain size of the grout materials radially spread on the facility floor under the baseline modeling conditions, to perform the sensitivity analysis with respect to the baseline design and operating conditions such as elevation of discharge port, discharge pipe diameter, and grout properties, and to determine the changes in grout density as it is related to grout drop height. An axi-symmetric two-phase modeling method was used for computational efficiency. Based on the nominal design and operating conditions, a transient computational approach was taken to compute flow fields mainly driven by pumping inertia and natural gravity. Detailed solution methodology and analysis results are discussed here.

Lee, S. Y. [Savannah River National Lab., Aiken, SC (United States); Hyun, S. [Mercer Univ., Macon, GA (United States)

2013-01-10T23:59:59.000Z

12

Materials Science and Engineering B 117 (2005) 5361 Finite element analysis-based design of a fluid-flow control nano-valve  

E-Print Network [OSTI]

of a fluid-flow control nano-valve M. Grujicica,, G. Caoa, B. Pandurangana, W.N. Royb a Department A finite element method-based procedure is developed for the design of molecularly functionalized nano-size devices. The procedure is aimed at the single-walled carbon nano-tubes (SWCNTs) used in the construction

Grujicic, Mica

13

AN AGGREGATION-BASED DOMAIN DECOMPOSITION PRECONDITIONER FOR GROUNDWATER FLOW  

E-Print Network [OSTI]

. Our analysis uses the standard finite element framework from [18,24]. The preconditioner also works well in the context of finite differences, however, as some of the examples in £ 3 illustrateAN AGGREGATION-BASED DOMAIN DECOMPOSITION PRECONDITIONER FOR GROUNDWATER FLOW E. W. JENKINS ¡, C

14

Infrastructure Analysis Tools: A Focus on Cash Flow Analysis (Presentation)  

SciTech Connect (OSTI)

NREL has developed and maintains a variety of infrastructure analysis models for the U.S. Department of Energy. Business case analysis has recently been added to this tool set. This presentation focuses on cash flow analysis. Cash flows depend upon infrastructure costs, optimized spatially and temporally, and assumptions about financing and revenue. NREL has incorporated detailed metrics on financing and incentives into the models. Next steps in modeling include continuing to collect feedback on regional/local infrastructure development activities and 'roadmap' dynamics, and incorporating consumer preference assumptions on infrastructure to provide direct feedback between vehicles and station rollout.

Melaina, M.; Penev, M.

2012-09-01T23:59:59.000Z

15

Principles of Secure Information Flow Analysis Geoffrey Smith  

E-Print Network [OSTI]

Principles of Secure Information Flow Analysis Geoffrey Smith School of Computing and Information to explain the #12;2 Geoffrey Smith principles underlying secure information flow analysis and to discuss

Smith, Geoffrey

16

A new variable in flow analysis  

E-Print Network [OSTI]

We have used a simple spectrum distribution which was derived from a hydrodynamical equation\\cite{Csorgo} to fit the data of the STAR group. It is found that it can fit the $v_2$ of STAR group very well. We have found that $v_2$ is sensitive to both the effective temperature of particles and the expanding velocity. We have suggested a new variable ${\\bf z}$ to be used in the flow analysis. This new variable will measure the correlation of particles momentum components. We have also shown that one of the $x$ or $y$ direction in the reaction plane is the direction which has the largest variance.

Q. H. Zhang; L. Huo; W. N. Zhang

2006-06-20T23:59:59.000Z

17

Probabilistic Vulnerability Assessment Based on Power Flow and Voltage Distribution  

SciTech Connect (OSTI)

Risk assessment of large scale power systems has been an important problem in power system reliability study. Probabilistic technique provides a powerful tool to solve the task. In this paper, we present the results of a study on probabilistic vulnerability assessment on WECC system. Cumulant based expansion method is applied to obtain the probabilistic distribution function (PDF) and cumulative distribution function (CDF) of power flows on transmission lines and voltage. Overall risk index based on the system vulnerability analysis is calculated using the WECC system. The simulation results based on WECC system is used to demonstrate the effectiveness of the method. The methodology can be applied to the risk analysis on large scale power systems.

Ma, Jian; Huang, Zhenyu; Wong, Pak C.; Ferryman, Thomas A.

2010-04-30T23:59:59.000Z

18

Structural Reliability Analysis for One Dimensional, Two Phase Miscible Flow  

E-Print Network [OSTI]

Structural Reliability Analysis for One Dimensional, Two Phase Miscible Flow David A. Coker­3600 December 22, 1992 Abstract An analytic structural reliability analysis is performed for first contact mis of the permeability. Key words: miscible flow, reliability methods, sensitivity analysis AMS(MOS): 35R60, 62N05,

New York at Stoney Brook, State University of

19

Particle filter based on thermophoretic deposition from natural convection flow  

SciTech Connect (OSTI)

We present an analysis of particle migration in a natural convection flow between parallel plates and within the annulus of concentric tubes. The flow channel is vertically oriented with one surface maintained at a higher temperature than the other. Particle migration is dominated by advection in the vertical direction and thermophoresis in the horizontal direction. From scale analysis it is demonstrated that particles are completely removed from air flowing through the channel if its length exceeds L[sub c] = (b[sup 4]g/24K[nu][sup 2]), where b is the width of the channel, g is the acceleration of gravity, K is a thermophoretic coefficient of order 0.5, and [nu] is the kinematic viscosity of air. Precise predictions of particle removal efficiency as a function of system parameters are obtained by numerical solution of the governing equations. Based on the model results, it appears feasible to develop a practical filter for removing smoke particles from a smoldering cigarette in an ashtray by using natural convection in combination with thermophoresis. 22 refs., 8 figs., 1 tab.

Sasse, A.G.B.M.; Nazaroff, W.W. (Univ. of California, Berkeley, CA (United States)); Gadgil, A.J. (Lawrence Berkeley Lab., CA (United States))

1994-04-01T23:59:59.000Z

20

Network Anomaly Detection: Flow-based or Packet-based Approach?  

E-Print Network [OSTI]

One of the most critical tasks for network administrator is to ensure system uptime and availability. For the network security, anomaly detection systems, along with firewalls and intrusion prevention systems are the must-have tools. So far in the field of network anomaly detection, people are working on two different approaches. One is flow-based; usually rely on network elements to make so-called flow information available for analysis. The second approach is packet-based; which directly analyzes the data packet information for the detection of anomalies. This paper describes the main differences between the two approaches through an in-depth analysis. We try to answer the question of when and why an approach is better than the other. The answer is critical for network administrators to make their choices in deploying a defending system, securing the network and ensuring business continuity.

Nguyen, Huy

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Analysis of oscillating flow cooled SMA actuator  

E-Print Network [OSTI]

literature, most of the cooling mechanisms involve unidirectional forced convection. This may not be the most effective method. Oscillating flow in a channel can sometimes enhance heat transfer over a unidirectional flow. One possible explanation...

Pachalla Seshadri, Rajagopal

2005-11-01T23:59:59.000Z

22

Flow Imaging Using MRI: Quantification and Analysis  

E-Print Network [OSTI]

&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Jim Ji Committee Members, Andrew K. Chan Deepa Kundur Yoonsuck Choe Mary P. McDougall Head of Department, Costas N... Committee: Dr. Jim Ji A complex and challenging problem in flow study is to obtain quantitative flow information in opaque systems, for example, blood flow in biological systems and flow channels in chemical reactors. In this regard, MRI is superior...

Jiraraksopakun, Yuttapong

2010-07-14T23:59:59.000Z

23

Finite element analysis of flows in secondary settling tanks D. Kleine 1 B. D. Reddy 2  

E-Print Network [OSTI]

Finite element analysis of flows in secondary settling tanks D. Kleine 1 B. D. Reddy 2 December 7, 2003 Abstract The equations governing unsteady flows in secondary settling tanks, a component settling tanks, and against results obtained from a finite difference code based on an idealized one

Reddy, Batmanathan Dayanand "Daya"

24

Ionization based multi-directional flow sensor  

DOE Patents [OSTI]

A method, system, and apparatus for conducting real-time monitoring of flow (airflow for example) in a system (a hybrid power generation system for example) is disclosed. The method, system and apparatus measure at least flow direction and velocity with minimal pressure drop and fast response. The apparatus comprises an ion source and a multi-directional collection device proximate the ion source. The ion source is configured to generate charged species (electrons and ions for example). The multi-directional collection source is configured to determine the direction and velocity of the flow in real-time.

Chorpening, Benjamin T. (Morgantown, WV); Casleton, Kent H. (Morgantown, WV)

2009-04-28T23:59:59.000Z

25

CFD analysis of laminar oscillating flows  

SciTech Connect (OSTI)

This paper describes a numerical simulations of oscillating flow in a constricted duct and compares the results with experimental and theoretical data. The numerical simulations were performed using the computational fluid dynamics (CFD) code CFX4.2. The numerical model simulates an experimental oscillating flow facility that was designed to test the properties and characteristics of oscillating flow in tapered ducts, also known as jet pumps. Jet pumps are useful devices in thermoacoustic machinery because they produce a secondary pressure that can counteract an unwanted effect called streaming, and significantly enhance engine efficiency. The simulations revealed that CFX could accurately model velocity, shear stress and pressure variations in laminar oscillating flow. The numerical results were compared to experimental data and theoretical predictions with varying success. The least accurate numerical results were obtained when laminar flow approached transition to turbulent flow.

Booten, C. W. Charles W.); Konecni, S. (Snezana); Smith, B. L. (Barton L.); Martin, R. A. (Richard A.)

2001-01-01T23:59:59.000Z

26

Development of a flow-condition-based interpolation 9-node element for incompressible flows  

E-Print Network [OSTI]

The Navier-Stokes equations are widely used for the analysis of incompressible laminar flows. If the Reynolds number is increased to certain values, oscillations appear in the finite element solution of the Navier-Stokes ...

Banijamali, Bahareh

2006-01-01T23:59:59.000Z

27

CONTINUOUSTIME FINITE ELEMENT ANALYSIS OF MULTIPHASE FLOW IN GROUNDWATER HYDROLOGY  

E-Print Network [OSTI]

CONTINUOUS­TIME FINITE ELEMENT ANALYSIS OF MULTIPHASE FLOW IN GROUNDWATER HYDROLOGY Zhangxin Chen­water system in groundwater hydrology is given. The system is written in a fractional flow formulation, i for an air­water system in groundwater hydrology, ff = a; w [1], [11], [26]: @(OEae ff s ff ) @t +r \\Delta

28

Geothermal Resource-Reservoir Investigations Based On Heat Flow...  

Open Energy Info (EERE)

Resource-Reservoir Investigations Based On Heat Flow And Thermal Gradient Data For The United States Jump to: navigation, search OpenEI Reference LibraryAdd to library Report:...

29

A design flow based on modular refinement  

E-Print Network [OSTI]

We propose a practical methodology based on modular refinement to design complex systems. The methodology relies on modules with latency-insensitive interfaces so that the refinements can change the timing contract of a ...

Dave, Nirav H.

30

Validation Analysis of the Shoal Groundwater Flow and Transport Model  

SciTech Connect (OSTI)

Environmental restoration at the Shoal underground nuclear test is following a process prescribed by a Federal Facility Agreement and Consent Order (FFACO) between the U.S. Department of Energy, the U.S. Department of Defense, and the State of Nevada. Characterization of the site included two stages of well drilling and testing in 1996 and 1999, and development and revision of numerical models of groundwater flow and radionuclide transport. Agreement on a contaminant boundary for the site and a corrective action plan was reached in 2006. Later that same year, three wells were installed for the purposes of model validation and site monitoring. The FFACO prescribes a five-year proof-of-concept period for demonstrating that the site groundwater model is capable of producing meaningful results with an acceptable level of uncertainty. The corrective action plan specifies a rigorous seven step validation process. The accepted groundwater model is evaluated using that process in light of the newly acquired data. The conceptual model of ground water flow for the Project Shoal Area considers groundwater flow through the fractured granite aquifer comprising the Sand Springs Range. Water enters the system by the infiltration of precipitation directly on the surface of the mountain range. Groundwater leaves the granite aquifer by flowing into alluvial deposits in the adjacent basins of Fourmile Flat and Fairview Valley. A groundwater divide is interpreted as coinciding with the western portion of the Sand Springs Range, west of the underground nuclear test, preventing flow from the test into Fourmile Flat. A very low conductivity shear zone east of the nuclear test roughly parallels the divide. The presence of these lateral boundaries, coupled with a regional discharge area to the northeast, is interpreted in the model as causing groundwater from the site to flow in a northeastward direction into Fairview Valley. Steady-state flow conditions are assumed given the absence of groundwater withdrawal activities in the area. The conceptual and numerical models were developed based upon regional hydrogeologic investigations conducted in the 1960s, site characterization investigations (including ten wells and various geophysical and geologic studies) at Shoal itself prior to and immediately after the test, and two site characterization campaigns in the 1990s for environmental restoration purposes (including eight wells and a year-long tracer test). The new wells are denoted MV-1, MV-2, and MV-3, and are located to the northnortheast of the nuclear test. The groundwater model was generally lacking data in the north-northeastern area; only HC-1 and the abandoned PM-2 wells existed in this area. The wells provide data on fracture orientation and frequency, water levels, hydraulic conductivity, and water chemistry for comparison with the groundwater model. A total of 12 real-number validation targets were available for the validation analysis, including five values of hydraulic head, three hydraulic conductivity measurements, three hydraulic gradient values, and one angle value for the lateral gradient in radians. In addition, the fracture dip and orientation data provide comparisons to the distributions used in the model and radiochemistry is available for comparison to model output. Goodness-of-fit analysis indicates that some of the model realizations correspond well with the newly acquired conductivity, head, and gradient data, while others do not. Other tests indicated that additional model realizations may be needed to test if the model input distributions need refinement to improve model performance. This approach (generating additional realizations) was not followed because it was realized that there was a temporal component to the data disconnect: the new head measurements are on the high side of the model distributions, but the heads at the original calibration locations themselves have also increased over time. This indicates that the steady-state assumption of the groundwater model is in error. To test the robustness of the model d

A. Hassan; J. Chapman

2008-11-01T23:59:59.000Z

31

Nonlinear analysis of transient flow in a piping network  

E-Print Network [OSTI]

Nonlinear analysis of transient flow in a piping network Weihua Cai and Mihir Sen Department Mathematical models of piping networks are in the form of a system of nonlin- ear differential analysis method are needed to give a good approximation. Keywords piping networks, perturbation

Sen, Mihir

32

Control Flow Analysis for Reverse Engineering of Sequence Diagrams  

E-Print Network [OSTI]

Control Flow Analysis for Reverse Engineering of Sequence Diagrams Atanas Rountev Olga Volgin and in software main- tenance. In static analysis for such reverse engineering, an open question is how to map an iteration. As pointed out in one popular book on modern software development [13], in this context

Rountev, Atanas "Nasko"

33

RESEARCH ARTICLE An optical flow MTV based technique for measuring microfluidic  

E-Print Network [OSTI]

RESEARCH ARTICLE An optical flow MTV based technique for measuring microfluidic flow for accurately measuring flow fields in microfluidic flows from molecular tagging velocimetry (MTV). Limited optical access is frequently encountered in microfluidic systems. Therefore, in this contribution we

Garbe, Christoph S.

34

Characterization of Limiting Factors in Laminar Flow-Based Membraneless Microfuel Cells  

E-Print Network [OSTI]

are underway to develop and optimize microscale fuel cells as high-energy-density power source alternatives, where fuel and oxidant are oxidized and re- duced, respectively, is essential for fuel cell optimization reports the analysis of a microflu- idic fuel cell based on laminar flow using an external reference

Kenis, Paul J. A.

35

Geographically Based Hydrogen Demand and Infrastructure Analysis...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Analysis Geographically Based Hydrogen Demand and Infrastructure Analysis Presentation by NREL's Margo Melendez at the 2010 - 2025 Scenario Analysis for Hydrogen Fuel Cell Vehicles...

36

Flow-Based Detection of Bar Coded Particles  

SciTech Connect (OSTI)

We have developed methods for flow control, electric field alignment, and readout of colloidal Nanobarcodes{copyright}. Our flow-based detection scheme leverages microfluidics and alternate current (AC) electric fields to align and image particles in a well-defined image plane. Using analytical models of the particle rotation in electric fields we can optimize the field strength and frequency necessary to align the particles. This detection platform alleviates loss of information in solution-based assays due to particle clumping during detection.

Rose, K A; Dougherty, G M; Santiago, J G

2005-06-24T23:59:59.000Z

37

Interpreting Velocities from Heat-Based Flow Sensors by NumericalSimulation  

SciTech Connect (OSTI)

We have carried out numerical simulations of three-dimensional non-isothermal flow around an in situ heat-based flow sensor to investigate how formation heterogeneities can affect the interpretation of ground water flow velocities from this instrument. The flow sensor operates by constant heating of a 0.75 m long, 5 cm diameter cylindrical probe, which contains 30 thermistors in contact with the formation. The temperature evolution at each thermistor can be inverted to obtain an estimate of the ground water flow velocity vector using the standard interpretive method, which assumes that the formation is homogeneous. Analysis of data from heat-based flow sensors installed in a sand aquifer at the Former Fort Ord Army Base near Monterey, California suggested an unexpected component of downward flow. The magnitudes of the vertical velocities were expected to be much less than the horizontal velocities at this site because the sensors were installed just above a clay aquitard. Numerical simulations were conducted to examine how differences in thermal conductivities may lead to spurious indications of vertical flow velocities. We found that a decrease in the thermal conductivity near the bottom of the sensor can perturb the temperature profiles along the instrument in such a manner that analyses assuming homogeneous thermal conductivity could indicate a vertical flow component even though flow is actually horizontal. This work demonstrates how modeling can be used to simulate instrument response to formation heterogeneity, and shows that caution must be used in interpreting data from such devices using overly simplistic assumptions.

Su, Grace W.; Freifeld, Barry M.; Oldenburg, Curtis M.; Jordan,Preston D.; Daley, Paul F.

2005-06-13T23:59:59.000Z

38

Heuristic Continuous Base Flow Separation Jozsef Szilagyi1  

E-Print Network [OSTI]

Heuristic Continuous Base Flow Separation Jozsef Szilagyi1 Abstract: A digital filtering algorithm 1994 and aquifer characterization Brutsaert and Nie- ber 1977; Troch et al. 1993; Szilagyi et al. 1998; Wittenberg and Sivapalan 1999; Szilagyi et al. 2003 , which is crucial in ascertaining safe yields of water

Szilagyi, Jozsef

39

Dependency Analysis for Control Flow Cycles in Reactive Communicating Processes  

E-Print Network [OSTI]

of the system. The way in which cycle executions are combined is not ar- bitrary since cycles may depend are combined is certainly not arbitrary. For instance, the repetition of one cycle may rely on the repetitionsDependency Analysis for Control Flow Cycles in Reactive Communicating Processes Stefan Leue1 , Alin

Leue, Stefan

40

Dependency Analysis for Control Flow Cycles in Reactive Communicating Processes  

E-Print Network [OSTI]

processes of the system. The way in which cycle executions are combined is not ar- bitrary since cycles may in which cycle executions are combined is certainly not arbitrary. For instance, the repetition of oneDependency Analysis for Control Flow Cycles in Reactive Communicating Processes Stefan Leue1 , Alin

Reiterer, Harald

Note: This page contains sample records for the topic "flow analysis base" 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

Flow Analysis on a Limited Volume Chilled Water System  

SciTech Connect (OSTI)

LANL Currently has a limited volume chilled water system for use in a glove box, but the system needs to be updated. Before we start building our new system, a flow analysis is needed to ensure that there are no high flow rates, extreme pressures, or any other hazards involved in the system. In this project the piping system is extremely important to us because it directly affects the overall design of the entire system. The primary components necessary for the chilled water piping system are shown in the design. They include the pipes themselves (perhaps of more than one diameter), the various fitting used to connect the individual pipes to form the desired system, the flow rate control devices (valves), and the pumps that add energy to the fluid. Even the most simple pipe systems are actually quite complex when they are viewed in terms of rigorous analytical considerations. I used an 'exact' analysis and dimensional analysis considerations combined with experimental results for this project. When 'real-world' effects are important (such as viscous effects in pipe flows), it is often difficult or impossible to use only theoretical methods to obtain the desired results. A judicious combination of experimental data with theoretical considerations and dimensional analysis are needed in order to reduce risks to an acceptable level.

Zheng, Lin [Los Alamos National Laboratory

2012-07-31T23:59:59.000Z

42

MATERIAL FLOW ANALYSIS FOR IDENTIFYING RARE EARTH ELEMENT  

E-Print Network [OSTI]

MATERIAL FLOW ANALYSIS FOR IDENTIFYING RARE EARTH ELEMENT RECYCLING POTENTIALS IN THE EU-27 D Rochelle (F) SUMMARY: Rare earth elements (REEs) are essential for high-techology industrial sectors earths. Rare earth elements (REEs) are a group of 17 elements comprising the 15 lanthanides, scandium

Paris-Sud XI, Université de

43

POWER FLOW ANALYSIS OF ELECTROSTRICTIVE ACTUATORS DRIVEN BYSWITCHMODE AMPLIFIERS  

E-Print Network [OSTI]

the actuator. INTRODUCTION Smart materials or smart structures are materials that contain actuators, sensors@vt.edu Journal on Intelligent Material Systems and Structures Vol. 9, No 3, March, 1998 pp. 210 - 222. Keywords: smart structures, smart skin, switchmode amplifiers, power flow analysis, electrostrictive actuators

Lindner, Douglas K.

44

A turbulence model for buoyant flows based on vorticity generation.  

SciTech Connect (OSTI)

A turbulence model for buoyant flows has been developed in the context of a k-{var_epsilon} turbulence modeling approach. A production term is added to the turbulent kinetic energy equation based on dimensional reasoning using an appropriate time scale for buoyancy-induced turbulence taken from the vorticity conservation equation. The resulting turbulence model is calibrated against far field helium-air spread rate data, and validated with near source, strongly buoyant helium plume data sets. This model is more numerically stable and gives better predictions over a much broader range of mesh densities than the standard k-{var_epsilon} model for these strongly buoyant flows.

Domino, Stefan Paul; Nicolette, Vernon F.; O'Hern, Timothy John; Tieszen, Sheldon R.; Black, Amalia Rebecca

2005-10-01T23:59:59.000Z

45

Microcomputer analysis of regenerative heat exchangers for oscillating flow  

SciTech Connect (OSTI)

Regenerative heat exchangers for use in oscillating flows such as those occurring in Stirling engines present considerable analytical problems to the thermal engineer. A simplified finite element analysis has been implemented in a spreadsheet, providing improved access to analytical assumptions and allowing parametric analysis of current heat transfer data. In addition, an irreversibility analysis has been implemented using the thermal and friction results in the spreadsheet. It is suited for evaluation and insights into loss tradeoffs inside operating regenerators, to suggest new regenerator design concepts, and to focus experimental work. 22 refs., 13 figs.

Hutchinson, R.A.; Lyke, S.E.

1987-03-01T23:59:59.000Z

46

Supersonic Flutter Analysis Based on a Local Piston Theory  

E-Print Network [OSTI]

Supersonic Flutter Analysis Based on a Local Piston Theory Wei-Wei Zhang, Zheng-Yin Ye, and Chen§ University of California, Irvine, Irvine, California 92697-3975 DOI: 10.2514/1.37750 A highly efficient local-piston speeds. A steady mean flow solution is first obtained by an Euler method. The classical piston theory

Liu, Feng

47

Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model  

SciTech Connect (OSTI)

This report is an updated analysis of water-level data performed to provide the ''Saturated Zone Site-Scale Flow Model'' (BSC 2004 [DIRS 170037]) (referred to as the saturated zone (SZ) site-scale flow model or site-scale SZ flow model in this report) with the configuration of the potentiometric surface, target water-level data, and hydraulic gradients for calibration of groundwater flow models. This report also contains an expanded discussion of uncertainty in the potentiometric-surface map. The analysis of the potentiometric data presented in Revision 00 of this report (USGS 2001 [DIRS 154625]) provides the configuration of the potentiometric surface, target heads, and hydraulic gradients for the calibration of the SZ site-scale flow model (BSC 2004 [DIRS 170037]). Revision 01 of this report (USGS 2004 [DIRS 168473]) used updated water-level data for selected wells through the year 2000 as the basis for estimating water-level altitudes and the potentiometric surface in the SZ site-scale flow and transport model domain based on an alternative interpretation of perched water conditions. That revision developed computer files containing: Water-level data within the model area (DTN: GS010908312332.002); A table of known vertical head differences (DTN: GS010908312332.003); and A potentiometric-surface map (DTN: GS010608312332.001) using an alternative concept from that presented by USGS (2001 [DIRS 154625]) for the area north of Yucca Mountain. The updated water-level data presented in USGS (2004 [DIRS 168473]) include data obtained from the Nye County Early Warning Drilling Program (EWDP) Phases I and II and data from Borehole USW WT-24. This document is based on Revision 01 (USGS 2004 [DIRS 168473]) and expands the discussion of uncertainty in the potentiometric-surface map. This uncertainty assessment includes an analysis of the impact of more recent water-level data and the impact of adding data from the EWDP Phases III and IV wells. In addition to being utilized by the SZ site-scale flow model, the water-level data and potentiometric-surface map contained within this report will be available to other government agencies and water users for groundwater management purposes. The potentiometric surface defines an upper boundary of the site-scale flow model and provides information useful to estimation of the magnitude and direction of lateral groundwater flow within the flow system. Therefore, the analysis documented in this revision is important to SZ flow and transport calculations in support of total system performance assessment (TSPA).

K. Rehfeldt

2004-10-08T23:59:59.000Z

48

Control Volume Analysis, Entropy Balance and the Entropy Production in Flow Systems  

E-Print Network [OSTI]

This chapter concerns "control volume analysis", the standard engineering tool for the analysis of flow systems, and its application to entropy balance calculations. Firstly, the principles of control volume analysis are enunciated and applied to flows of conserved quantities (e.g. mass, momentum, energy) through a control volume, giving integral (Reynolds transport theorem) and differential forms of the conservation equations. Several definitions of steady state are discussed. The concept of "entropy" is then established using Jaynes' maximum entropy method, both in general and in equilibrium thermodynamics. The thermodynamic entropy then gives the "entropy production" concept. Equations for the entropy production are then derived for simple, integral and infinitesimal flow systems. Some technical aspects are examined, including discrete and continuum representations of volume elements, the effect of radiation, and the analysis of systems subdivided into compartments. A Reynolds decomposition of the entropy production equation then reveals an "entropy production closure problem" in fluctuating dissipative systems: even at steady state, the entropy production based on mean flow rates and gradients is not necessarily in balance with the outward entropy fluxes based on mean quantities. Finally, a direct analysis of an infinitesimal element by Jaynes' maximum entropy method yields a theoretical framework with which to predict the steady state of a flow system. This is cast in terms of a "minimum flux potential" principle, which reduces, in different circumstances, to maximum or minimum entropy production (MaxEP or MinEP) principles. It is hoped that this chapter inspires others to attain a deeper understanding and higher technical rigour in the calculation and extremisation of the entropy production in flow systems of all types.

Robert K. Niven; Bernd R. Noack

2014-07-21T23:59:59.000Z

49

Energy flow lines as light paths a didactical analysis  

E-Print Network [OSTI]

Analyses of interviews with secondary school students about their conceptions of light at the University of Potsdam indicate that numerous students have a deterministic view of light. With regard to these results the model of energy flow lines, which has been discussed recently in the didactical literature, is of special interest. Following this model, light is presumed to move along energy flow lines as trajectories. In an analysis of the model of energy flow lines four didactical dimensions (didactical content, internal structure, present-day relevance and future significance) are investigated. It can be shown that a discussion of this model in physics at school can increase the meta-conceptional knowledge of the students about the models of light. On the other hand, this can promote deterministic conceptions and the Bohm interpretation of quantum mechanics. But the question remains: Should the nature of light really be described as deterministic?

Horn, M E

2006-01-01T23:59:59.000Z

50

AnalyzeHOLE: An Integrated Wellbore Flow Analysis Tool  

SciTech Connect (OSTI)

Conventional interpretation of flow logs assumes that hydraulic conductivity is directly proportional to flow change with depth. However, well construction can significantly alter the expected relation between changes in fluid velocity and hydraulic conductivity. Strong hydraulic conductivity contrasts between lithologic intervals can be masked in continuously screened wells. Alternating intervals of screen and blank casing also can greatly complicate the relation between flow and hydraulic properties. More permeable units are not necessarily associated with rapid fluid-velocity increases. Thin, highly permeable units can be misinterpreted as thick and less permeable intervals or not identified at all. These conditions compromise standard flow-log interpretation because vertical flow fields are induced near the wellbore. AnalyzeHOLE, an integrated wellbore analysis tool for simulating flow and transport in wells and aquifer systems, provides a better alternative for simulating and evaluating complex well-aquifer system interaction. A pumping well and adjacent aquifer system are simulated with an axisymmetric, radial geometry in a two-dimensional MODFLOW model. Hydraulic conductivities are distributed by depth and estimated with PEST by minimizing squared differences between simulated and measured flows and drawdowns. Hydraulic conductivity can vary within a lithology but variance is limited with regularization. Transmissivity of the simulated system also can be constrained to estimates from single-well, pumping tests. Water-quality changes in the pumping well are simulated with simple mixing models between zones of differing water quality. These zones are differentiated by backtracking thousands of particles from the well screens with MODPATH. An Excel spreadsheet is used to interface the various components of AnalyzeHOLE by (1) creating model input files, (2) executing MODFLOW, MODPATH, PEST, and supporting FORTRAN routines, and (3) importing and graphically displaying pertinent results.

Keith J. Halford

2009-10-01T23:59:59.000Z

51

228 POWER FLOW ANALYSIS parties, it is crucial to recognize the inherently subjective nature of OPF. Power flow  

E-Print Network [OSTI]

228 POWER FLOW ANALYSIS parties, it is crucial to recognize the inherently subjective nature of OPF. Power flow analysis by itself basically answers a question of physics. By contrast, OPF answers criteria. In short, "optim- ality" does not arise from a power system's intrinsic technical properties

Kammen, Daniel M.

52

Redox flow batteries based on supporting solutions containing chloride  

DOE Patents [OSTI]

Redox flow battery systems having a supporting solution that contains Cl.sup.- ions can exhibit improved performance and characteristics. Furthermore, a supporting solution having mixed SO.sub.4.sup.2- and Cl.sup.- ions can provide increased energy density and improved stability and solubility of one or more of the ionic species in the catholyte and/or anolyte. According to one example, a vanadium-based redox flow battery system is characterized by an anolyte having V.sup.2+ and V.sup.3+ in a supporting solution and a catholyte having V.sup.4+ and V.sup.5+ in a supporting solution. The supporting solution can contain Cl.sup.- ions or a mixture of SO.sub.4.sup.2- and Cl.sup.- ions.

Li, Liyu; Kim, Soowhan; Yang, Zhenguo; Wang, Wei; Zhang, Jianlu; Chen, Baowei; Nie, Zimin; Xia, Guanguang

2014-01-14T23:59:59.000Z

53

FRAC-STIM: A Physics-Based Fracture Simulation, /reservoir Flow...  

Broader source: Energy.gov (indexed) [DOE]

FRAC-STIM: A Physics-Based Fracture Simulation, reservoir Flow and Heat Transport Simulator(aka FALCON) FRAC-STIM: A Physics-Based Fracture Simulation, reservoir Flow and Heat...

54

Physics-Based, Reduced-Order Combustor Flow Modeling Sean D. Bradshaw  

E-Print Network [OSTI]

Physics-Based, Reduced-Order Combustor Flow Modeling by Sean D. Bradshaw B.S., Aeronautics-Based, Reduced-Order Combustor Flow Modeling by Sean D. Bradshaw Submitted to the Department of Aeronautics in Aeronautics And Astronautics Abstract A physics-based, reduced-order combustor flow model, CFLOW, is described

Peraire, Jaime

55

Non--Equilibrium Blunt Body Flow 1 Analysis of NonEquilibrium, Hypersonic Blunt  

E-Print Network [OSTI]

Non--Equilibrium Blunt Body Flow 1 Analysis of Non­Equilibrium, Hypersonic Blunt Body Flow streamline quantities and the stagnation point heat transfer in hypersonic flows about spheres or cylinders, as two-- dimensional hypersonic flows about spheres or cylinders exhibit an approximate local similarity

56

TRACKING ELEPHANT FLOWS IN INTERNET BACKBONE TRAFFIC WITH AN FPGA-BASED CACHE  

E-Print Network [OSTI]

TRACKING ELEPHANT FLOWS IN INTERNET BACKBONE TRAFFIC WITH AN FPGA-BASED CACHE Martin Zadnik an FPGA-friendly approach to track- ing elephant flows in network traffic. Our approach, Single Step elephant flows: con- servatively promoting potential elephants and evicting low- rate flows in LRU manner

Haddadi, Hamed

57

Simulation analysis of within-day flow fluctuation effects on trout below flaming Gorge Dam.  

SciTech Connect (OSTI)

In addition to being renewable, hydropower has the advantage of allowing rapid load-following, in that the generation rate can easily be varied within a day to match the demand for power. However, the flow fluctuations that result from load-following can be controversial, in part because they may affect downstream fish populations. At Flaming Gorge Dam, located on the Green River in northeastern Utah, concern has been raised about whether flow fluctuations caused by the dam disrupt feeding at a tailwater trout fishery, as fish move in response to flow changes and as the flow changes alter the amount or timing of the invertebrate drift that trout feed on. Western Area Power Administration (Western), which controls power production on submonthly time scales, has made several operational changes to address concerns about flow fluctuation effects on fisheries. These changes include reducing the number of daily flow peaks from two to one and operating within a restricted range of flows. These changes significantly reduce the value of the power produced at Flaming Gorge Dam and put higher load-following pressure on other power plants. Consequently, Western has great interest in understanding what benefits these restrictions provide to the fishery and whether adjusting the restrictions could provide a better tradeoff between power and non-power concerns. Directly evaluating the effects of flow fluctuations on fish populations is unfortunately difficult. Effects are expected to be relatively small, so tightly controlled experiments with large sample sizes and long study durations would be needed to evaluate them. Such experiments would be extremely expensive and would be subject to the confounding effects of uncontrollable variations in factors such as runoff and weather. Computer simulation using individual-based models (IBMs) is an alternative study approach for ecological problems that are not amenable to analysis using field studies alone. An IBM simulates how a population responds to environmental changes by representing how the population's individuals interact with their environment and each other. IBMs represent key characteristics of both individual organisms (trout, in this case) and the environment, thus allowing controlled simulation experiments to analyze the effects of changes in the key variables. For the flow fluctuation problem at Flaming Gorge Dam, the key environmental variables are flow rates and invertebrate drift concentrations, and the most important processes involve how trout adapt to changes (over space and time) in growth potential and mortality risk. This report documents simulation analyses of flow fluctuation effects on trout populations. The analyses were conducted in a highly controlled fashion: an IBM was used to predict production (survival and growth) of trout populations under a variety of scenarios that differ only in the level or type of flow fluctuation.

Railsback, S. F.; Hayse, J. W.; LaGory, K. E.; Environmental Science Division; EPRI

2006-01-01T23:59:59.000Z

58

The backward phase flow and FBI-transform-based Eulerian Gaussian beams for the Schrdinger equation  

E-Print Network [OSTI]

The backward phase flow and FBI-transform-based Eulerian Gaussian beams for the SchrŲdinger beam FBI transform Reinitialization SchrŲdinger Backward phase flow a b s t r a c t We propose the backward phase flow method to implement the Fourier≠Bros≠Iagolnitzer (FBI)-transform-based Eulerian

Soatto, Stefano

59

Multi-phase flow well test analysis in multi-layer reservoirs  

SciTech Connect (OSTI)

This paper investigates the performance of an oil well under multi-phase flow test conditions when the reservoir pressure falls below the bubble point pressure and is correspond with the performance of dissolved gas reservoirs. The model reservoir comprises two commingled layer, where a well test is conducted on a fully perforated interval. The water phase is assumed immobile. The main objective of this work is to interpret the flowing well pressure response and to predict reservoir characteristics based on its performance. The work presented is based on a constant terminal rate analysis, but it can also applied to constant bottomhole pressure and can be used to predict the Inflow Performance Relationship (IPR).

Jatmiko, W.; Archer, J.S. [Imperial College, London (United Kingdom); Daltaban, T.S.

1996-12-31T23:59:59.000Z

60

A Flow-Channel Analysis for the Mars Hopper  

SciTech Connect (OSTI)

The Mars Hopper is an exploratory vehicle designed to fly on Mars using carbon dioxide from the Martian atmosphere as a rocket propellant. The propellent gasses are thermally heated while traversing a radioisotope ther- mal rocket (RTR) engineís core. This core is comprised of a radioisotope surrounded by a heat capacitive material interspersed with tubes for the propellant to travel through. These tubes, or flow channels, can be manu- factured in various cross-sectional shapes such as a special four-point star or the traditional circle. Analytical heat transfer and computational fluid dynamics (CFD) anal- yses were performed using flow channels with either a circle or a star cross- sectional shape. The nominal total inlet pressure was specified at 2,805,000 Pa; and the outlet pressure was set to 2,785,000 Pa. The CO2 inlet tem- perature was 300 K; and the channel wall was 1200 K. The steady-state CFD simulations computed the smooth-walled star shapeís outlet temper- ature to be 959 K on the finest mesh. The smooth-walled circleís outlet temperature was 902 K. A circle with a surface roughness specification at 0.01 mm gave 946 K and at 0.1 mm yielded 989 K. The The effects of a slightly varied inlet pressure were also examined. The analytical calculations were based on the mass flow rates computed in the CFD simulations and provided significantly higher outlet temperature results while displaying the same comparison trends. Research relating to the flow channel heat transfer studies was also done. Mathematical methods to geometrically match the cross-sectional areas of the circle and star, along with a square and equilateral triangle, were derived. A Wolfram Mathematica 8 module was programmed to analyze CFD results using Richardson Extrapolation and calculate the grid convergence index (GCI). A Mathematica notebook, also composed, computes and graphs the bulk mean temperature along a flow channelís length while the user dynam- ically provides the input variables, allowing their effects on the temperature to be more easily observed.

W. Spencer Cooley

2013-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Characterization of fracture networks for fluid flow analysis  

SciTech Connect (OSTI)

The analysis of fluid flow through fractured rocks is difficult because the only way to assign hydraulic parameters to fractures is to perform hydraulic tests. However, the interpretation of such tests, or ''inversion'' of the data, requires at least that we know the geometric pattern formed by the fractures. Combining a statistical approach with geophysical data may be extremely helpful in defining the fracture geometry. Cross-hole geophysics, either seismic or radar, can provide tomograms which are pixel maps of the velocity or attenuation anomalies in the rock. These anomalies are often due to fracture zones. Therefore, tomograms can be used to identify fracture zones and provide information about the structure within the fracture zones. This structural information can be used as the basis for simulating the degree of fracturing within the zones. Well tests can then be used to further refine the model. Because the fracture network is only partially connected, the resulting geometry of the flow paths may have fractal properties. We are studying the behavior of well tests under such geometry. Through understanding of this behavior, it may be possible to use inverse techniques to refine the a priori assignment of fractures and their conductances such that we obtain the best fit to a series of well test results simultaneously. The methodology described here is under development and currently being applied to several field sites. 4 refs., 14 figs.

Long, J.C.S.; Billaux, D.; Hestir, K.; Majer, E.L.; Peterson, J.; Karasaki, K.; Nihei, K.; Gentier, S.; Cox, L.

1989-06-01T23:59:59.000Z

62

1992 Columbia River Salmon Flow Measures Options Analysis/EIS.  

SciTech Connect (OSTI)

This Options Analysis/Environmental Impact Statement (OA/EIS) identifies, presents effects of, and evaluates the potential options for changing instream flow levels in efforts to increase salmon populations in the lower Columbia and Snake rivers. The potential actions would be implemented during 1992 to benefit juvenile and adult salmon during migration through eight run-of-river reservoirs. The Corps of Engineers (Corps) prepared this document in cooperation with the Bonneville Power Administration and the Bureau of Reclamation. The US Fish and Wildlife Service (FSWS) is a participating agency. The text and appendices of the document describe the characteristics of 10 Federal projects and one private water development project in the Columbia River drainage basin. Present and potential operation of these projects and their effects on the salmon that spawn and rear in the Columbia and Snake River System are presented. The life history, status, and response of Pacific salmon to current environmental conditions are described.

Not Available

1992-01-01T23:59:59.000Z

63

Robust Extraction Interface for Coupling Droplet-Based and Continuous Flow Microfluidics  

SciTech Connect (OSTI)

Reliable and highly efficient extraction of droplets from oil to aqueous phase is key for downstream coupling with chemical separations and nonoptical detection methods such as amperometry and mass spectrometry. This paper presents an improved interface providing robust extraction for droplet-based poly(dimethylsiloxane) (PDMS) microfluidic devices. The extraction interface consists of an array of cylindrical posts with narrow apertures in between. The aqueous flow channel into which droplets coalesced was simply and selectively modified to be hydrophilic, while the continuous oil phase flow channel that contained encapsulated aqueous droplets retained a hydrophobic surface. The different surfaces on both sides of the extraction region form a highly stable liquid interface between the two immiscible phases, allowing rapid droplet transfer to the aqueous stream. Entire droplets could be completely extracted within broad ranges of aqueous and oil flow rates (0 - 1 and 0.1 - 1 uL/min, respectively). After extraction, the droplet contents could be transported electrophoretically or by pressure-driven flow to a monolithically integrated emitter for nano-electrospray ionization mass spectrometry (nanoESI-MS) analysis. This interface should be amenable to the separation and identification of droplet contents and on-line monitoring of in-droplet reactions.

Sun, Xuefei; Tang, Keqi; Smith, Richard D.; Kelly, Ryan T.

2012-03-07T23:59:59.000Z

64

High throughput analysis of samples in flowing liquid  

DOE Patents [OSTI]

Apparatus and method enable imaging multiple fluorescent sample particles in a single flow channel. A flow channel defines a flow direction for samples in a flow stream and has a viewing plane perpendicular to the flow direction. A laser beam is formed as a ribbon having a width effective to cover the viewing plane. Imaging optics are arranged to view the viewing plane to form an image of the fluorescent sample particles in the flow stream, and a camera records the image formed by the imaging optics.

Ambrose, W. Patrick (Los Alamos, NM); Grace, W. Kevin (Los Alamos, NM); Goodwin, Peter M. (Los Alamos, NM); Jett, James H. (Los Alamos, NM); Orden, Alan Van (Fort Collins, CO); Keller, Richard A. (White Rock, NM)

2001-01-01T23:59:59.000Z

65

Symmetry group analysis of an ideal plastic flow  

E-Print Network [OSTI]

In this paper, we study the Lie point symmetry group of a system describing an ideal plastic plane flow in two dimensions in order to find analytical solutions. The infinitesimal generators that span the Lie algebra for this system are obtained. We completely classify the subalgebras of up to codimension two in conjugacy classes under the action of the symmetry group. Based on invariant forms, we use Ansatzes to compute symmetry reductions in such a way that the obtained solutions cover simultaneously many invariant and partially invariant solutions. We calculate solutions of the algebraic, trigonometric, inverse trigonometric and elliptic type. Some solutions depending on one or two arbitrary functions of one variable have also been found. In some cases, the shape of a potentially feasible extrusion die corresponding to the solution is deduced. These tools could be used to thin, curve, undulate or shape a ring in an ideal plastic material.

Vincent Lamothe

2011-02-11T23:59:59.000Z

66

Analysis of models for induced gas flow in the unsaturated zone Kehua You,1  

E-Print Network [OSTI]

Analysis of models for induced gas flow in the unsaturated zone Kehua You,1 Hongbin Zhan,1 term are frequently employed in modeling the induced gas flow in an unsaturated zone underlying a leaky 2011. [1] Accurate description of induced gas flow in an unsaturated zone is indispensable

Zhan, Hongbin

67

Hybrid Recursive Energy-based Method for Robust Optical Flow on Large Motion Fields  

E-Print Network [OSTI]

Hybrid Recursive Energy-based Method for Robust Optical Flow on Large Motion Fields Jangheon Kim for optical flow estimation. The method efficiently combines the advantage of discrete motion estimation and optical flow estimation in a recursive block-to-pixel estimation scheme. Integrated local and global

Wichmann, Felix

68

Numeric Simulation of Heat Transfer and Electrokinetic Flow in an Electroosmosis-Based  

E-Print Network [OSTI]

Numeric Simulation of Heat Transfer and Electrokinetic Flow in an Electroosmosis-Based Continuous is dedicated to under- standing the fluid flow and heat transfer mechanisms occurring in continuous flow PCR are discussed in detail. The importance of each heat transfer mechanism for different situations is also

Le Roy, Robert J.

69

Time evolution of electron flow in a model diode: Non-perturbative analysis  

SciTech Connect (OSTI)

Using a combination of Eulerian and Lagrangian variables we study the time evolution of the electron flow from a no-current state to a final state with the stationary current in a planar one-dimensional diode. The electrons can be injected externally or generated by the cathode via field emission governed by a current-field law. The initial zero current regime is replaced suddenly by injection or, in the case of field emission, by jumping the anode voltage from zero to a constant positive value. The case of equipotential electrodes and fixed injection is studied along with a positive anode potential. When the current is fixed externally, the approach to the stationary state goes without oscillations if the initial electron velocity is high enough and the anode can absorb the injected flow. Otherwise the accumulated space charge creates a potential barrier which reflects the flow and leads to its oscillations, but our method of analysis is invalid in such conditions. In the field emission case the flow goes to its stationary state through a train of decaying oscillations whose period is of the order of the electron transit time, in agreement with earlier studies based on perturbation techniques. Our approximate method does not permit very high cathode emissivity although the method works when the stationary current density is only about 10% smaller than the Child-Langmuir limit.

Rokhlenko, A.; Lebowitz, J. L. [Department of Mathematics, Rutgers University, Piscataway, New Jersey 08854-8019 (United States)

2013-12-21T23:59:59.000Z

70

Capacitance-based prover for gas flow meters  

E-Print Network [OSTI]

) Sunday . . . Stability Measurement: /tC vs. Time (21 Feb 95). . . . Capacitance vs. Time for Mass Flow Rate of 124. 7 g/s. . . . 41 41 42 23 Capacitance vs. Time for Mass Flow Rate of 124. 7 g/s (06 Apr 95). . . . . . . . . . . 43 24 25 Pressure... vs. Time for Mass Flow Rate of 124. 7 g/s (06 Apr 95). . . . Capacitance vs. Time for Mass Flow Rate of 209. 1 g/s. . . . 43 44 FIGURE 26 Capacitance vs. Time for Loading Phase 27 Pressure vs. Time for Loading Phase. 28 T; vs. Time...

Pipkins, Sean Patrick

1995-01-01T23:59:59.000Z

71

Agent-Based Modeling and Simulation for Hydrogen Transition Analysis...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Agent-Based Modeling and Simulation for Hydrogen Transition Analysis Agent-Based Modeling and Simulation for Hydrogen Transition Analysis Presentation on Agent-Based Modeling and...

72

A review and development of correlations for base pressure and base heating in supersonic flow  

SciTech Connect (OSTI)

A comprehensive review of experimental base pressure and base heating data related to supersonic and hypersonic flight vehicles has been completed. Particular attention was paid to free-flight data as well as wind tunnel data for models without rear sting support. Using theoretically based correlation parameters, a series of internally consistent, empirical prediction equations has been developed for planar and axisymmetric geometries (wedges, cones, and cylinders). These equations encompass the speed range from low supersonic to hypersonic flow and laminar and turbulent forebody boundary layers. A wide range of cone and wedge angles and cone bluntness ratios was included in the data base used to develop the correlations. The present investigation also included preliminary studies of the effect of angle of attack and specific-heat ratio of the gas.

Lamb, J.P. [Texas Univ., Austin, TX (United States). Dept. of Mechanical Engineering; Oberkampf, W.L. [Sandia National Labs., Albuquerque, NM (United States)

1993-11-01T23:59:59.000Z

73

Bubble Size Control to Improve Oxygen-Based Bleaching: Characterization of Flow Regimes in Pulp-Water-Gas Three-Phase Flows  

SciTech Connect (OSTI)

Flow characteristics of fibrous paper pulp-water-air slurries were investigated in a vertical circular column 1.8 m long, with 5.08 cm diameter. Flow structures, gas holdup (void fraction), and the geometric and population characteristics of gas bubbles were experimentally investigated, using visual observation, Gamma-ray densitometry, and flash X-ray photography. Five distinct flow regimes could be visually identified: dispersed bubbly, layered bubbly, plug, churn-turbulent, and slug. Flow regime maps were constructed, and the regime transition lines were found to be sensitive to consistency. The feasibility of using artificial neural networks (ANNs) for the identification of the flow regimes, using the statistical characteristics of pressure fluctuations measured by a single pressure sensor, was demonstrated. Local pressure fluctuations at a station were recorded with a minimally-intrusive transducer. Three-layer, feed-forward ANNs were designed that could identify the four major flow patterns (bubbly, plug, churn, and slug) well. The feasibility of a transportable artificial neural network (ANN) - based technique for the classification of flow regimes was also examined. Local pressures were recorded at three different locations using three independent but similar transducers. An ANN was designed, trained and successfully tested for the classification of the flow regimes using one of the normalized pressure signals (from Sensor 1). The ANN trained and tested for Sensor 1 predicted the flow regimes reasonably well when applied directly to the other two sensors, indicating a good deal of transportability. An ANN-based method was also developed, whereby the power spectrum density characteristics of other sensors were adjusted before they were used as input to the ANN that was based on Sensor 1 alone. The method improved the predictions. The gas-liquid interfacial surface area concentration was also measured in the study. The gas absorption technique was applied, using CO2 as the transferred species and sodium hydroxide as the alkaline agent in water. Statistical analysis was performed to identify the parametric dependencies. The experimental data were empirically correlated.

S.M. Ghiaasiaan and Seppo Karrila

2006-03-20T23:59:59.000Z

74

Analysis of Alcove 8/Niche 3 Flow and Transport Tests  

SciTech Connect (OSTI)

The purpose of this report is to document analyses of the Alcove 8/Niche 3 flow and transport tests, with a focus on the large-infiltration-plot tests and compare pre-test model predictions with the actual test observations. The tests involved infiltration that originated from the floor of Alcove 8 (located in the Enhanced Characterization of Repository Block (ECRB) Cross Drift) and observations of seepage and tracer transport at Niche 3 (located in the Main Drift of the Exploratory Studies Facility (ESF)). The test results are relevant to drift seepage and solute transport in the unsaturated zone (UZ) of Yucca Mountain. The main objective of this analysis was to evaluate the modeling approaches used and the importance of the matrix diffusion process by comparing simulation and actual test observations. The pre-test predictions for the large plot test were found to differ from the observations and the reasons for the differences were documented in this report to partly address CR 6783, which concerns unexpected test results. These unexpected results are discussed and assessed with respect to the current baseline unsaturated zone radionuclide transport model in Sections 6.2.4, 6.3.2, and 6.4.

H.H. Liu

2006-09-01T23:59:59.000Z

75

Analysis of pressure drops under reversing flow conditions  

SciTech Connect (OSTI)

This paper examines pressure-drop data from the Reversing Flow Test Facility (RFTF) at Argonne National Laboratory (ANL). The data comprise part of an initial series of measurements conducted with pressurized helium gas under reversing flow conditions. The characteristics of fluid pressure drops in compressible, reversing flows are discussed in the paper and compared with pressure-drop measurements for steady, incompressible flows. The methodology used to calculate instantaneous mass flows in the test section of the RFTF is summarized. The measured pressure drops are analyzed in terms of their frictional and inertial components. Pressure-drop data are presented for both tubes and wire mesh regenerators over a range of flow reversal frequencies. The results are discussed with reference to other experimental data and analytical models available in the literature. 10 refs., 6 figs., 2 tabs.

Krazinski, J.L.; Holtz, R.E.; Uherka, K.L.; Lottes, P.A.

1986-01-01T23:59:59.000Z

76

Electrochimica Acta 50 (2005) 53905398 Membraneless laminar flow-based micro fuel cells operating in alkaline,  

E-Print Network [OSTI]

Electrochimica Acta 50 (2005) 5390­5398 Membraneless laminar flow-based micro fuel cells operating) in membraneless, laminar flow-based micro fuel cells (LF-FCs) eliminates several PEM-related issues such as fuel the anode is in acidic media while the cathode is in alkali, or vice versa. Operating a fuel cell under

Kenis, Paul J. A.

77

Multiple stirred-flow chamber assembly for simultaneous automatic fractionation of trace elements in fly ash samples using a multisyringe-based flow system  

SciTech Connect (OSTI)

There is a current trend in automation of leaching tests for trace elements in solid matrixes by use of flow injection based column approaches. However, as a result of the downscaled dimensions of the analytical manifold and execution of a single extraction at a time, miniaturized flow-through column approaches have merely found applications for periodic investigations of trace element mobility in highly homogeneous environmental solids. A novel flow-based configuration capitalized on stirred-flow cell extraction is proposed in this work for simultaneous fractionation of trace elements in three solid wastes with no limitation of sample amount up to 1.0 g. A two-step sequential extraction scheme involving water and acetic acid (or acetic acid/acetate buffer) is utilized for accurate assessment of readily mobilizable fractions of trace elements in fly ash samples. The W automated extraction system features high tolerance to flow rates ({<=} 6 mL min{sup -1}) and, as opposed to operationally defined batchwise methods, the solid to liquid ratio is not a critical parameter for, determination of overall readily leachable trace elements provided that exhaustive extraction is ensured. Analytical performance of the dynamic extractor is evaluated for fractionation analysis of a real coal fly ash and BCR-176R fly ash certified reference material. No significant differences were found at the 0.05 significance level between summation of leached concentrations in each fraction plus residue and concentration values of BCR-176R, thus revealing the accuracy of the automated method. Overall extractable pools of trace metals in three samples are separated in less than 115 min, even for highly contaminated ashes, versus 18-24 h per fraction in equilibrium leaching tests. The multiple stirred-flow cell assembly is thus suitable for routine risk assessment studies of industrial solid byproduct.

Boonjob, W.; Miro, M.; Cerda, V. [Mahidol University, Bangkok (Thailand). Faculty of Science

2008-10-01T23:59:59.000Z

78

Dispersed Fluid Flow in Fractured Reservoirs- an Analysis of...  

Open Energy Info (EERE)

correlations. Downhole measurements of the tracer response exiting from discrete fracture zones permit further characterization of reservoir fluid flow behavior. Tracer...

79

Edge-based Meshless Methods for Compressible Flow Simulations  

E-Print Network [OSTI]

are obtained for airfoils in transonic flow. Lift and drag coefficients also compare well to the finite volume, including (1) the application of certain artificial diffusion schemes to meshless methods within an edge

Jameson, Antony

80

Studies of the analyte-carrier interface in flow injection analysis  

SciTech Connect (OSTI)

Chemical analysis in flowing solution is popular for automation of classical methods. However, most of the classical methods are not specific enough for direct multicomponent analysis of simple mixtures. This research project has the goals of study of rapid multicomponent analysis of transient species in flowing media, and investigations of chemical reactions at interfaces and of effects of competition on distribution of products from interfacial reaction. This report summarizes work done over the past 4.5 years; support has been terminated.

Brown, S.D.

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Time series power flow analysis for distribution connected PV generation.  

SciTech Connect (OSTI)

Distributed photovoltaic (PV) projects must go through an interconnection study process before connecting to the distribution grid. These studies are intended to identify the likely impacts and mitigation alternatives. In the majority of the cases, system impacts can be ruled out or mitigation can be identified without an involved study, through a screening process or a simple supplemental review study. For some proposed projects, expensive and time-consuming interconnection studies are required. The challenges to performing the studies are twofold. First, every study scenario is potentially unique, as the studies are often highly specific to the amount of PV generation capacity that varies greatly from feeder to feeder and is often unevenly distributed along the same feeder. This can cause location-specific impacts and mitigations. The second challenge is the inherent variability in PV power output which can interact with feeder operation in complex ways, by affecting the operation of voltage regulation and protection devices. The typical simulation tools and methods in use today for distribution system planning are often not adequate to accurately assess these potential impacts. This report demonstrates how quasi-static time series (QSTS) simulation and high time-resolution data can be used to assess the potential impacts in a more comprehensive manner. The QSTS simulations are applied to a set of sample feeders with high PV deployment to illustrate the usefulness of the approach. The report describes methods that can help determine how PV affects distribution system operations. The simulation results are focused on enhancing the understanding of the underlying technical issues. The examples also highlight the steps needed to perform QSTS simulation and describe the data needed to drive the simulations. The goal of this report is to make the methodology of time series power flow analysis readily accessible to utilities and others responsible for evaluating potential PV impacts.

Broderick, Robert Joseph; Quiroz, Jimmy Edward; Ellis, Abraham; Reno, Matthew J. [Georgia Institute of Technology, Atlanta, GA; Smith, Jeff [Electric Power Research Institute, Knoxville, TN; Dugan, Roger [Electric Power Research Institute, Knoxville, TN

2013-01-01T23:59:59.000Z

82

Modeling of stagnation-line nonequilibrium flows by means of quantum based collisional models  

SciTech Connect (OSTI)

The stagnation-line flow over re-entry bodies is analyzed by means of a quantum based collisional model which accounts for dissociation and energy transfer in N{sub 2}-N interactions. The physical model is based on a kinetic database developed at NASA Ames Research Center. The reduction of the kinetic mechanism is achieved by lumping the rovibrational energy levels of the N{sub 2} molecule in energy bins. The energy bins are treated as separate species, thus allowing for non-Boltzmann distributions of their populations. The governing equations are discretized in space by means of the Finite Volume method. A fully implicit time-integration is used to obtain steady-state solutions. The results show that the population of the energy bins strongly deviate from a Boltzmann distribution close to the shock wave and across the boundary layer. The sensitivity analysis to the number of energy bins reveals that accurate estimation of flow quantities (such as chemical composition and wall heat flux) can be obtained by using only 10 energy bins. A comparison with the predictions obtained by means of conventional multi-temperature models indicates that the former can lead to an overestimation of the wall heat flux, due to an inaccurate modeling of recombination in the boundary layer.

MunafÚ, A., E-mail: munafo@vki.ac.be; Magin, T. E., E-mail: magin@vki.ac.be [Aeronautics and Aerospace Department, von Karman Institute for Fluid Dynamics, 1640 Rhode-Saint-GenŤse (Belgium)

2014-09-15T23:59:59.000Z

83

Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve  

SciTech Connect (OSTI)

A virtual water flow meter is developed that uses the chilled water control valve on an air-handling unit as a measurement device. The flow rate of water through the valve is calculated using the differential pressure across the valve and its associated coil, the valve command, and an empirically determined valve characteristic curve. Thus, the probability of error in the measurements is significantly greater than for conventionally manufactured flow meters. In this paper, mathematical models are developed and used to conduct uncertainty analysis for the virtual flow meter, and the results from the virtual meter are compared to measurements made with an ultrasonic flow meter. Theoretical uncertainty analysis shows that the total uncertainty in flow rates from the virtual flow meter is 1.46% with 95% confidence; comparison of virtual flow meter results with measurements from an ultrasonic flow meter yielded anuncertainty of 1.46% with 99% confidence. The comparable results from the theoretical uncertainty analysis and empirical comparison with the ultrasonic flow meter corroborate each other, and tend to validate the approach to computationally estimating uncertainty for virtual sensors introduced in this study.

Song, Li; Wang, Gang; Brambley, Michael R.

2013-04-28T23:59:59.000Z

84

Evaluation of Stallion Sperm Membrane Integrity Using Varied Flow Cytometer-Based Methodologies  

E-Print Network [OSTI]

. Data were collected daily on sperm motion characteristics, SMI, mitochondrial membrane potential, and DNA quality. To measure daily changes in SMI in stallion sperm, two fluorescent vital-staining protocols used in flow cytometric analysis were...

Stump, Karen Elizabeth

2013-04-24T23:59:59.000Z

85

Throughput-cost analysis of optical flow switching  

E-Print Network [OSTI]

In this paper, we employ a cost model embodying major sources of capital expenditure (CapEx) to compare the throughput-cost tradeoff offered by optical flow switching to that of more traditional optical network architectures.

Chan, Vincent W. S.

86

Feature-Based Statistical Analysis of Combustion Simulation Data  

SciTech Connect (OSTI)

We present a new framework for feature-based statistical analysis of large-scale scientific data and demonstrate its effectiveness by analyzing features from Direct Numerical Simulations (DNS) of turbulent combustion. Turbulent flows are ubiquitous and account for transport and mixing processes in combustion, astrophysics, fusion, and climate modeling among other disciplines. They are also characterized by coherent structure or organized motion, i.e. nonlocal entities whose geometrical features can directly impact molecular mixing and reactive processes. While traditional multi-point statistics provide correlative information, they lack nonlocal structural information, and hence, fail to provide mechanistic causality information between organized fluid motion and mixing and reactive processes. Hence, it is of great interest to capture and track flow features and their statistics together with their correlation with relevant scalar quantities, e.g. temperature or species concentrations. In our approach we encode the set of all possible flow features by pre-computing merge trees augmented with attributes, such as statistical moments of various scalar fields, e.g. temperature, as well as length-scales computed via spectral analysis. The computation is performed in an efficient streaming manner in a pre-processing step and results in a collection of meta-data that is orders of magnitude smaller than the original simulation data. This meta-data is sufficient to support a fully flexible and interactive analysis of the features, allowing for arbitrary thresholds, providing per-feature statistics, and creating various global diagnostics such as Cumulative Density Functions (CDFs), histograms, or time-series. We combine the analysis with a rendering of the features in a linked-view browser that enables scientists to interactively explore, visualize, and analyze the equivalent of one terabyte of simulation data. We highlight the utility of this new framework for combustion science; however, it is applicable to many other science domains.

Bennett, J; Krishnamoorthy, V; Liu, S; Grout, R; Hawkes, E; Chen, J; Pascucci, V; Bremer, P T

2011-11-18T23:59:59.000Z

87

ANALYSIS OF HIGH PRESSURE TESTS ON WET GAS FLOW METERING WITH A VENTURI METER  

E-Print Network [OSTI]

ANALYSIS OF HIGH PRESSURE TESTS ON WET GAS FLOW METERING WITH A VENTURI METER P. Gajan , Q, 64018 Pau cedex, France pierre.gajan@onera.fr Abstract This work deals with the flow metering of wet gas on the CEESI facilities are presented. They are performed at 75 bars with 0.6 beta ratio Venturi meter

88

The Analysis of Underexpanded Jet Flows for Hypersonic Aerodynamic Experiments in  

E-Print Network [OSTI]

The Analysis of Underexpanded Jet Flows for Hypersonic Aerodynamic Experiments in Vacuum Chambers V of rarefied-gas flows [1]- [3] and aerodynamics of hypersonic probes in wind tunnels [4]-[7]. The objective using quantum concepts [9], [10]. Aerodynamic characteristics of wedges, disks, and plates are studied

Riabov, Vladimir V.

89

Static analysis for efficient hybrid information-flow control Scott Moore  

E-Print Network [OSTI]

-time overhead of the monitor, particularly in applications where sensitive (i.e., confidential or untrustedStatic analysis for efficient hybrid information-flow control Scott Moore and Stephen Chong TR-05 information-flow control Scott Moore School of Engineering and Applied Sciences Harvard University Cambridge

Chong, Stephen

90

Effects of non-Darcy flow on pressure buildup analysis of hydraulically fractured gas reservoirs  

E-Print Network [OSTI]

-Darcy flow in the hydraulic fracture and its effects on pressure buildup analysis of hydraulically fractured gas reservoirs. A reservoir simulator was used to generate pressure drawdown and buildup data both with and without the effects of non-Darcy flow...

Alvarez Vera, Cesar

2001-01-01T23:59:59.000Z

91

Online Speed Scaling Based on Active Job Count to Minimize Flow plus Energy  

E-Print Network [OSTI]

Online Speed Scaling Based on Active Job Count to Minimize Flow plus Energy Tak-Wah Lam Lap-Kei Lee research on online job scheduling has gradually taken speed scaling and energy usage into consideration algorithms that aim at minimizing the total flow time plus energy usage. The results are divided into two

Wong, Prudence W.H.

92

IN SITU STRESS, FRACTURE AND FLUID FLOW ANALYSIS-EAST FLANK OF...  

Open Energy Info (EERE)

FRACTURE AND FLUID FLOW ANALYSIS-EAST FLANK OF THE COSO GEOTHERMAL FIELD Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: IN SITU STRESS,...

93

IN SITU STRESS, FRACTURE, AND FLUID FLOW ANALYSIS IN WELL 38C...  

Open Energy Info (EERE)

FRACTURE, AND FLUID FLOW ANALYSIS IN WELL 38C-9:AN ENHANCED GEOTHERMAL SYSTEM IN THE COSO GEOTHERMAL FIELD Jump to: navigation, search OpenEI Reference LibraryAdd to library...

94

In situ stress, fracture, and fluid flow analysis in Well 38C...  

Open Energy Info (EERE)

situ stress, fracture, and fluid flow analysis in Well 38C-9: an enhanced geothermal system in the Coso geothermal field Jump to: navigation, search OpenEI Reference LibraryAdd to...

95

Analysis of operating data related to power and flow distribution in a PWR  

E-Print Network [OSTI]

The analysis of the effects of the uncertainties associated with temperature and power measurements in the Connecticut Yankee Reactor leads to the evaluation of the uncertainty associated with the effective flow factor. ...

Herbin, Henry Christophe

1974-01-01T23:59:59.000Z

96

Framework for the Economic Analysis of Hybrid Systems Based on Exergy Consumption  

SciTech Connect (OSTI)

Starting from an overview of the dynamic behavior of the electricity market the need of the introduction of energy users that will provide a damping capability to the system is derived as also a qualitative analysis of the impact of uncertainty, both in the demand and supply side, is performed. Then it follows an introduction to the investment analysis methodologies based on the discounting of the cash flow, and then work concludes with the illustration and application of the exergonomic principles to provide a sound methodology for the cost accounting of the plant components to be used in the cash flow analysis.

Cristian Rabiti; Robert S. Cherry; Wesley R. Deason; Piyush Sabharwall; Shannon M. Bragg-Sitton; Richard D. Boardman

2014-08-01T23:59:59.000Z

97

Symbolic Test Selection Based on Approximate Analysis  

E-Print Network [OSTI]

Symbolic Test Selection Based on Approximate Analysis Bertrand Jeannet, Thierry J¬īeron, Vlad Rusu}@irisa.fr Abstract. This paper addresses the problem of generating symbolic test cases for testing the conformance. The challenge we consider is the selection of test cases according to a test purpose, which is here a set

Paris-Sud XI, Université de

98

The planar X-junction flow: stability analysis and control  

E-Print Network [OSTI]

and ? is the kinematic viscosity. The velocity ratio is defined as Vr = U2 U1 , (2.2) where U2 is the maximum inflow velocity of the side channels. In this paper, we study the stability of the X-junction flow in the Reynolds number regime 60 waves, and the lift-up effect. To determine the instability mechanism in our flow, we note that the present instability is stationary, the mode shape streamwise elon- gated, and the streamwise velocity component order of magnitude larger than...

Lashgari, Iman; Tammisola, Outi; Citro, Vincenzo; Juniper, Matthew P.; Brandt, Luca

2014-07-29T23:59:59.000Z

99

Development of magnetic separation methods of analysis: magnetic field flow fractionation  

E-Print Network [OSTI]

DEVELOPMENT OF MAGNETIC SEPARATION METHODS OF ANALYSIS: MAGNETIC FIELD FLOW FRACTIONATION A Thesis by JAIME GARCIA-RAMIREZ Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE August 1980 Major Subject: Chemistry DEVELOPMENT OF MAGNETIC SEPARATION METHODS OF ANALYSIS: MAGNETIC FIELD FLOW FRACTIONATION A Thesis by JAIME GARCIA-RAMIREZ Approved as to style and content by: (Chairman of Committee) 1...

Garcia-Ramirez, Jaime

1980-01-01T23:59:59.000Z

100

An Equivalent Network for Load-Flow Analysis of Power Systems  

E-Print Network [OSTI]

AN EQUIVALENT NETWORK FOR LOAD-FLOW ANALYSIS OF POWER SYSTEMS A Thesis by Meri on L. Johnson Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partihl fulfillment of the requirements for the degree... of MASTER OF SCIENCE May, 1960 Major Subject: Electrical Engineering AN EQUIVALENT NETWORK FOR LOAD-FLOW ANALYSIS OF POWER SYSTEMS A Thesis By Merion L. Johnson Approv as to style a d content by (Chairman of Co ittee ) (Head of Department...

Johnson, Merion Luke

1960-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

A finite element viscous flow analysis in a radial turbine scroll  

E-Print Network [OSTI]

A FINITE ELEMENT VISCOUS FLOW ANALYSIS IN A RADIAL TURBINE SCROLL A Thesis DONALD LEE HILL JR. Submitted to the Graduate College. of Texas ASM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE December... 1987 Major Subject: Mechanical Engineering A FINITE ELEMENT VISCOUS FLOW ANALYSIS IN A RADIAL TURBINE SCROLL A Thesis by DONALD LEE HILL JR. Approved as to style snd content by: Dr. Erian A. Baskharone (Chairman of Conunittee) Dr. Alan B azzolo...

Hill, Donald Lee

1987-01-01T23:59:59.000Z

102

TEMPO-based Catholyte for High Energy Density Nonaqueous Redox Flow Batteries  

SciTech Connect (OSTI)

We will present a novel design lithium-organic non-aqueous redox flow battery based on a TEMPO catholyte. This RFB produced desired electrochemical performance exceeding most of the currently reported nonaqueous RFB systems.

Wei, Xiaoliang; Xu, Wu; Vijayakumar, M.; Cosimbescu, Lelia; Liu, Tianbiao L.; Sprenkle, Vincent L.; Wang, Wei

2014-12-03T23:59:59.000Z

103

Simscape Design Flow for Memristor Based Programmable Oscillators  

E-Print Network [OSTI]

oscillator is characterized within the Simscape framework. The oscillation frequency and power consumption of memristor-based oscillators. (2) A Gravitational Search Algorithm (GSA) based optimization algorithm in terms of power consumption and frequency. (4) The first ever Simscape based models for titanium oxide

Mohanty, Saraju P.

104

An analysis of an application of radioactive ionization for gas flow metering  

E-Print Network [OSTI]

fulfillment of the requirements for ths legree of MASTER OF SC1ENCE May 1959 Major Subject: Electrical Engines x ing AN ANALYSIS OF AN APPLICATION OF RADIOACTIVE IONIZATION FOR l 1 '~, '1 1 ', '1 ' 1 1 "1 g 1 n \\ '& \\ GAS FLOW METERING A...'s Apparatus Z. An Ezperimental Flow Meter . 3. Mark I Meter and Test Equipment 4. Electrical Circuit 5. Current vs. Flow Rate Curve for Mark I Meter. . . . . . . . . . . . . 6. Current vs. Flow Rate for DifferentSource Spacings. . . . . . . . . . 7...

Lam, Carroll Frank

2012-06-07T23:59:59.000Z

105

Analysis of Transient Processes in a Radiophysical Flow System  

E-Print Network [OSTI]

Transient processes in a third-order radiophysical flow system are studied and a map of the transient process duration versus initial conditions is constructed and analyzed. The results are compared to the arrangement of submanifolds of the stable and unstable cycles in the Poincare section of the system studied.

E. N. Egorov; A. A. Koronovskii; A. E. Hramov

2006-01-31T23:59:59.000Z

106

Self-learning IP Traffic Classification based on Statistical Flow Characteristics  

E-Print Network [OSTI]

and intrusion detection. The most common identification technique based on the inspection of `known port numbers or encrypted traffic. The authors of [1] propose signature-based methods to classify P2P traffic. AlthoughSelf-learning IP Traffic Classification based on Statistical Flow Characteristics Sebastian Zander1

Zander, Sebastian

107

Graphene-based battery electrodes having continuous flow paths  

SciTech Connect (OSTI)

Some batteries can exhibit greatly improved performance by utilizing electrodes having randomly arranged graphene nanosheets forming a network of channels defining continuous flow paths through the electrode. The network of channels can provide a diffusion pathway for the liquid electrolyte and/or for reactant gases. Metal-air batteries can benefit from such electrodes. In particular Li-air batteries show extremely high capacities, wherein the network of channels allow oxygen to diffuse through the electrode and mesopores in the electrode can store discharge products.

Zhang, Jiguang; Xiao, Jie; Liu, Jun; Xu, Wu; Li, Xiaolin; Wang, Deyu

2014-05-24T23:59:59.000Z

108

Estimation of the base flow recession constant under human interference  

E-Print Network [OSTI]

Geologic controls on ground-water storage and base ?ow, J.law model to relate ground- water storage in an uncon?ned

Thomas, Brian F; Vogel, Richard M; Kroll, Charles N; Famiglietti, James S

2013-01-01T23:59:59.000Z

109

Spatial and temporal analysis and experiments of annular two-phase flow under microgravity conditions  

E-Print Network [OSTI]

, sounding rockets, the Shuttle or the future Space Station. Under zero-g conditions the time average base state geometry of gas-liquid flow in cylindrical channels should be axisymmetric (as in vertical flow on Earth) because buoyancy does not act.../16/86. 62 23 Experimental set-up of 1987. 24 Experimental set-up of 1990. 65 66 25 Different flow conditions for the 1987 flights, from top to bottom: wavy turbulent, two bubbles touching each other or annular, wavy turbulent- laminar, slug flow. . 67...

Carron, Igor

1992-01-01T23:59:59.000Z

110

Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model  

SciTech Connect (OSTI)

This Analysis/Model Report (AMR) documents an updated analysis of water-level data performed to provide the saturated-zone, site-scale flow and transport model (CRWMS M&O 2000) with the configuration of the potentiometric surface, target water-level data, and hydraulic gradients for model calibration. The previous analysis was presented in ANL-NBS-HS-000034, Rev 00 ICN 01, Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model (USGS 2001). This analysis is designed to use updated water-level data as the basis for estimating water-level altitudes and the potentiometric surface in the SZ site-scale flow and transport model domain. The objectives of this revision are to develop computer files containing (1) water-level data within the model area (DTN: GS010908312332.002), (2) a table of known vertical head differences (DTN: GS0109083 12332.003), and (3) a potentiometric-surface map (DTN: GS010608312332.001) using an alternate concept from that presented in ANL-NBS-HS-000034, Rev 00 ICN 01 for the area north of Yucca Mountain. The updated water-level data include data obtained from the Nye County Early Warning Drilling Program (EWDP) and data from borehole USW WT-24. In addition to being utilized by the SZ site-scale flow and transport model, the water-level data and potentiometric-surface map contained within this report will be available to other government agencies and water users for ground-water management purposes. The potentiometric surface defines an upper boundary of the site-scale flow model, as well as provides information useful to estimation of the magnitude and direction of lateral ground-water flow within the flow system. Therefore, the analysis documented in this revision is important to SZ flow and transport calculations in support of total system performance assessment.

P. Tucci

2001-12-20T23:59:59.000Z

111

Development of a flow injection analysis method for the determination of acrylamide copolymers in oilfield brines  

SciTech Connect (OSTI)

An automated method for the determination of acrylamide polymers by flow injection analysis (FIA) has been developed and optimized for routine use. The method has been extensively tested for interferences common in oilfield brines. Potential interferences were examined from Na{sup +}, Ca{sup 2+}, Cr{sup 3+}, Al{sup 3+}, Zr{sup 3+}, NH{sub 4}{sup +}, Cl{sup {minus}}, OH{sup {minus}}, CO{sub 3}{sup 2{minus}}, sample coloration, and commonly used surfactants. The analysis is specific for amides, and the sensitivity to concentration of amide groups in the polymer was shown to be constant as the degree of polymer hydrolysis was varied. The range of the method is 0.1 to 100 mg/L. Sample throughput is 30 samples/h with triplicate analysis. Relative standard deviations of 0.2% are readily obtained from standard solutions and 0.5% from complex samples (at 50 mg/L). The method is applicable to the determination of aqueous, acrylamide-based polymers in process streams, surface waters and oilfield brines.

Taylor, K.C.; Burke, R.A.; Schramm, L.L. [Petroleum Recovery Inst., Calgary, Alberta (Canada); Nasr-El-Din, H.A. [Saudi Aramco, Dhahran (Saudi Arabia)

1995-11-01T23:59:59.000Z

112

1980 Base case and feasibility analysis  

SciTech Connect (OSTI)

This report describes a task of documenting a ``base case`` and performing a feasibility analysis for a national residential energy efficiency program for new homes, The principal objective of the task wasto estimate the energy consumption of typical homes built in 1980 and then to identify and assess the feasibility of methods to reduce that consumption by 50%. The goal of the program by the year 2000 is to reduce heating and cooling energy use in new homes built under the program to one-half of the energy use in typical new homes built in 1980. The task also calls for determining whether the program goal should be revised, based on the analysis.

none,

1993-03-01T23:59:59.000Z

113

1980 Base case and feasibility analysis  

SciTech Connect (OSTI)

This report describes a task of documenting a base case'' and performing a feasibility analysis for a national residential energy efficiency program for new homes, The principal objective of the task wasto estimate the energy consumption of typical homes built in 1980 and then to identify and assess the feasibility of methods to reduce that consumption by 50%. The goal of the program by the year 2000 is to reduce heating and cooling energy use in new homes built under the program to one-half of the energy use in typical new homes built in 1980. The task also calls for determining whether the program goal should be revised, based on the analysis.

Not Available

1993-03-01T23:59:59.000Z

114

A high sensitivity fiber optic macro-bend based gas flow rate transducer for low flow rates: Theory, working principle, and static calibration  

SciTech Connect (OSTI)

A novel fiber optic macro-bend based gas flowmeter for low flow rates is presented. Theoretical analysis of the sensor working principle, design, and static calibration were performed. The measuring system consists of: an optical fiber, a light emitting diode (LED), a Quadrant position sensitive Detector (QD), and an analog electronic circuit for signal processing. The fiber tip undergoes a deflection in the flow, acting like a cantilever. The consequent displacement of light spot center is monitored by the QD generating four unbalanced photocurrents which are function of fiber tip position. The analog electronic circuit processes the photocurrents providing voltage signal proportional to light spot position. A circular target was placed on the fiber in order to increase the sensing surface. Sensor, tested in the measurement range up to 10 l min{sup -1}, shows a discrimination threshold of 2 l min{sup -1}, extremely low fluid dynamic resistance (0.17 Pa min l{sup -1}), and high sensitivity, also at low flow rates (i.e., 33 mV min l{sup -1} up to 4 l min{sup -1} and 98 mV min l{sup -1} from 4 l min{sup -1} up to 10 l min{sup -1}). Experimental results agree with the theoretical predictions. The high sensitivity, along with the reduced dimension and negligible pressure drop, makes the proposed transducer suitable for medical applications in neonatal ventilation.

Schena, Emiliano; Saccomandi, Paola; Silvestri, Sergio [Center for Integrated Research, Unit of Measurements and Biomedical Instrumentation, Universita Campus Bio-Medico di Roma, Via Alvaro del Portillo, 21, 00128 Rome (Italy)

2013-02-15T23:59:59.000Z

115

Techno-Economic Analysis of Biofuels Production Based on Gasification  

SciTech Connect (OSTI)

This study compares capital and production costs of two biomass-to-liquid production plants based on gasification. The first biorefinery scenario is an oxygen-fed, low-temperature (870?C), non-slagging, fluidized bed gasifier. The second scenario is an oxygen-fed, high-temperature (1,300?C), slagging, entrained flow gasifier. Both are followed by catalytic Fischer-Tropsch synthesis and hydroprocessing to naphtha-range (gasoline blend stock) and distillate-range (diesel blend stock) liquid fractions. Process modeling software (Aspen Plus) is utilized to organize the mass and energy streams and cost estimation software is used to generate equipment costs. Economic analysis is performed to estimate the capital investment and operating costs. Results show that the total capital investment required for nth plant scenarios is $610 million and $500 million for high-temperature and low-temperature scenarios, respectively. Product value (PV) for the high-temperature and low-temperature scenarios is estimated to be $4.30 and $4.80 per gallon of gasoline equivalent (GGE), respectively, based on a feedstock cost of $75 per dry short ton. Sensitivity analysis is also performed on process and economic parameters. This analysis shows that total capital investment and feedstock cost are among the most influential parameters affecting the PV.

Swanson, R. M.; Platon, A.; Satrio, J. A.; Brown, R. C.; Hsu, D. D.

2010-11-01T23:59:59.000Z

116

Chapter 11. Community analysis-based methods  

SciTech Connect (OSTI)

Microbial communities are each a composite of populations whose presence and relative abundance in water or other environmental samples are a direct manifestation of environmental conditions, including the introduction of microbe-rich fecal material and factors promoting persistence of the microbes therein. As shown by culture-independent methods, different animal-host fecal microbial communities appear distinctive, suggesting that their community profiles can be used to differentiate fecal samples and to potentially reveal the presence of host fecal material in environmental waters. Cross-comparisons of microbial communities from different hosts also reveal relative abundances of genetic groups that can be used to distinguish sources. In increasing order of their information richness, several community analysis methods hold promise for MST applications: phospholipid fatty acid (PLFA) analysis, denaturing gradient gel electrophoresis (DGGE), terminal restriction fragment length polymorphism (TRFLP), cloning/sequencing, and PhyloChip. Specific case studies involving TRFLP and PhyloChip approaches demonstrate the ability of community-based analyses of contaminated waters to confirm a diagnosis of water quality based on host-specific marker(s). The success of community-based MST for comprehensively confirming fecal sources relies extensively upon using appropriate multivariate statistical approaches. While community-based MST is still under evaluation and development as a primary diagnostic tool, results presented herein demonstrate its promise. Coupled with its inherently comprehensive ability to capture an unprecedented amount of microbiological data that is relevant to water quality, the tools for microbial community analysis are increasingly accessible, and community-based approaches have unparalleled potential for translation into rapid, perhaps real-time, monitoring platforms.

Cao, Y.; Wu, C.H.; Andersen, G.L.; Holden, P.A.

2010-05-01T23:59:59.000Z

117

Bulk-Flow analysis for force and moment coefficients of a shrouded centrifugal compressor impeller  

E-Print Network [OSTI]

An analysis is developed for a compressible bulk-flow model of the leakage path between a centrifugal compressor's impeller shroud and housing along the front and back side of the impeller. This is an extension of analysis performed first by Childs...

Gupta, Manoj Kumar

2005-08-29T23:59:59.000Z

118

Computational Analysis of Material Flow During Friction Stir Welding of AA5059 Aluminum Alloys  

E-Print Network [OSTI]

Computational Analysis of Material Flow During Friction Stir Welding of AA5059 Aluminum Alloys M welding (FSW) process are investigated computationally. Within the numerical model of the FSW process component. The employed coupled Eulerian/Lagrangian computational analysis of the welding process

Grujicic, Mica

119

Wavelet-based Adaptive Techniques Applied to Turbulent Hypersonic Scramjet Intake Flows  

E-Print Network [OSTI]

The simulation of hypersonic flows is computationally demanding due to large gradients of the flow variables caused by strong shock waves and thick boundary or shear layers. The resolution of those gradients imposes the use of extremely small cells in the respective regions. Taking turbulence into account intensives the variation in scales even more. Furthermore, hypersonic flows have been shown to be extremely grid sensitive. For the simulation of three-dimensional configurations of engineering applications, this results in a huge amount of cells and prohibitive computational time. Therefore, modern adaptive techniques can provide a gain with respect to computational costs and accuracy, allowing the generation of locally highly resolved flow regions where they are needed and retaining an otherwise smooth distribution. An h-adaptive technique based on wavelets is employed for the solution of hypersonic flows. The compressible Reynolds averaged Navier-Stokes equations are solved using a differential Reynolds s...

Frauholz, Sarah; Reinartz, Birgit U; MŁller, Siegfried; Behr, Marek

2013-01-01T23:59:59.000Z

120

Harmonic Analysis of a Three-Phase Diode Bridge Rectifier based on Sampled-Data Model  

E-Print Network [OSTI]

Harmonic Analysis of a Three-Phase Diode Bridge Rectifier based on Sampled-Data Model K. L. Lian. As demonstrated in the paper, the proposed method analytically evaluates harmonics, and obtains exact switching is to incorporate it into a harmonic power flow program to yield improved accuracy. Index Terms-- Diode Bridge

Lehn, Peter W.

Note: This page contains sample records for the topic "flow analysis base" 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

Tsallis Entropy Based Velocity Distribution in Open Channel Flows  

E-Print Network [OSTI]

............................................................. 94 32 Dimensionless velocity distribution and parameter M ............................... 96 33 um/ umax versus various M ........................................................................... 99 34 Upper Tiber River basin with location... velocity distribution with different m ... 68 9 Computation of M, ?1 and ?V based on um and umax measured on the Po river (Italy) for different verticals at Pontelagoscuro gauged section during flood event that occurred on February 2, 1985...

Luo, Hao

2010-07-14T23:59:59.000Z

122

An Integral Flow-Based Energy-Efficient Routing Algorithm for Wireless Sensor Networks  

E-Print Network [OSTI]

An Integral Flow-Based Energy-Efficient Routing Algorithm for Wireless Sensor Networks Shashidhar. As sensor nodes are energy-constrained, energy-efficient routing is essential for increasing the lifetime. In this paper, we consider static base stations and propose an algorithmic approach to obtain integral energy-efficient

Prakash, Ravi

123

Flow distribution analysis on the cooling tube network of ITER thermal shield  

SciTech Connect (OSTI)

Thermal shield (TS) is to be installed between the vacuum vessel or the cryostat and the magnets in ITER tokamak to reduce the thermal radiation load to the magnets operating at 4.2K. The TS is cooled by pressurized helium gas at the inlet temperature of 80K. The cooling tube is welded on the TS panel surface and the composed flow network of the TS cooling tubes is complex. The flow rate in each panel should be matched to the thermal design value for effective radiation shielding. This paper presents one dimensional analysis on the flow distribution of cooling tube network for the ITER TS. The hydraulic cooling tube network is modeled by an electrical analogy. Only the cooling tube on the TS surface and its connecting pipe from the manifold are considered in the analysis model. Considering the frictional factor and the local loss in the cooling tube, the hydraulic resistance is expressed as a linear function with respect to mass flow rate. Sub-circuits in the TS are analyzed separately because each circuit is controlled by its own control valve independently. It is found that flow rates in some panels are insufficient compared with the design values. In order to improve the flow distribution, two kinds of design modifications are proposed. The first one is to connect the tubes of the adjacent panels. This will increase the resistance of the tube on the panel where the flow rate is excessive. The other design suggestion is that an orifice is installed at the exit of tube routing where the flow rate is to be reduced. The analysis for the design suggestions shows that the flow mal-distribution is improved significantly.

Nam, Kwanwoo; Chung, Wooho; Noh, Chang Hyun; Kang, Dong Kwon; Kang, Kyoung-O; Ahn, Hee Jae; Lee, Hyeon Gon [ITER Korea, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)

2014-01-29T23:59:59.000Z

124

Study of an ammonia-based wet scrubbing process in a continuous flow system  

SciTech Connect (OSTI)

A continuous gas and liquid flow, regenerative scrubbing process for CO{sub 2} capture was demonstrated at the bench-scale level. An aqueous ammonia-based solution captures CO{sub 2} from simulated flue gas in an absorber and releases a nearly pure stream of CO{sub 2} in the regenerator. After the regeneration, the solution of ammonium compounds is recycled to the absorber. The design of a continuous flow unit was based on earlier exploratory results from a semi-batch reactor, where a CO{sub 2} and N{sub 2} simulated flue gas mixture flowed through a well-mixed batch of ammonia-based solution. During the semi-batch tests, the solution was cycled between absorption and regeneration steps to measure the carrying capacity of the solution at various initial ammonia concentrations and temperatures. Consequentially, a series of tests were conducted on the continuous unit to observe the effect of various parameters on CO{sub 2} removal efficiency and regenerator effectiveness within the flow system. The parameters that were studied included absorber temperature, regenerator temperature, initial NH{sub 3} concentration, simulated flue gas flow rate, liquid solvent inventory in the flow system, and height of the packed-bed absorber. From this testing and subsequent testing, ammonia losses from both the absorption and regeneration steps were quantified, and attempts were made to maintain steady state during operations. Implications of experimental results with respect to process design are discussed.

Mao, James X.; Lee, Anita S.; Kitchin, John R.; Nulwala, Hunaid B.; Luebke, David R.; Damodaran, Krishnan

2013-01-01T23:59:59.000Z

125

A Database and Meta-Analysis of Ecological Responses to Flow in the South Atlantic Region  

SciTech Connect (OSTI)

Generalized and quantitative relationships between flow and ecology are pivotal to developing environmental flow standards based on socially acceptable ecological conditions. Informing management at regional scales requires compiling sufficient hydrologic and ecological sources of information, identifying information gaps, and creating a framework for hypothesis development and testing. We compiled studies of empirical and theoretical relationships between flow and ecology in the South Atlantic region (SAR) of the United States to evaluate their utility for the development of environmental flow standards. Using database searches, internet searches, and agency contacts, we gathered 186 sources of information that provided a qualitative or quantitative relationship between flow and ecology within states encompassing the SAR. A total of 109 of the 186 sources had sufficient information to support quantitative analyses. Ecological responses to natural changes in flow magnitude, frequency, and duration were highly variable regardless of the direction and magnitude of changes in flow. In contrast, the majority of ecological responses to anthropogenic-induced flow alterations were negative. Fish consistently showed negative responses to anthropogenic flow alterations whereas other ecological groups showed somewhat variable responses (e.g. macroinvertebrates and riparian vegetation) and even positive responses (e.g. algae). Fish and organic matter had sufficient sample sizes to stratify natural flow-ecology relationships by specific flow categories (e.g. high flow, baseflows) or by region (e.g. coastal plain, uplands). After stratifying relationships, we found that significant correlations existed between changes in natural flow and ecological responses. In addition, a regression tree explained 57% of the variation in fish responses to anthropogenic and natural changes in flow. Because of some ambiguity in interpreting the directionality in ecological responses, we utilized ecological gains or losses, where each represents a benefit or reduction to ecosystem services, respectively. Variables explained 49% of the variation in ecological gains and losses for all ecological groups combined. Altogether, our results suggested that the source of flow change and the ecological group of interest played primary roles in determining the direction and magnitude of ecological responses. Furthermore, our results suggest that developing broadly generalized relationships between ecology and changes in flow at a regional scale is unlikely unless relationships are placed within meaningful contexts, such as environmental flow components or by geomorphic setting.

McManamay, Ryan A [ORNL; Orth, Dr. Donald J [Virginia Polytechnic Institute and State University (Virginia Tech); Davis, Dr, Mary [Southeastern Aquatic Resources Partnership; Kauffman, John [John Kauffman LLC.

2013-01-01T23:59:59.000Z

126

Second law analysis of water flow through smooth microtubes under adiabatic conditions  

SciTech Connect (OSTI)

In the study, a second law analysis for a steady-laminar flow of water in adiabatic microtubes has been conducted. Smooth microtubes with the diameters between 50 and 150 {mu}m made of fused silica were used in the experiments. Considerable temperature rises due to viscous dissipation and relatively high pressure losses of flow were observed in experiments. To identify irreversibility of flow, rate of entropy generation from the experiments have been determined in the laminar flow range of Re = 20-2200. The second law of thermodynamics was applied to predict the entropy generation. The results of model taken from the literature, proposed to predict the temperature rise caused by viscous heating, correspond well with the experimental data. The second law analysis results showed that the flow characteristics in the smooth microtubes distinguish substantially from the conventional theory for flow in the larger tubes with respect to viscous heating/dissipation (temperature rise of flow) total entropy generation rate and lost work. (author)

Parlak, Nezaket; Guer, Mesut; Ari, Vedat; Kuecuek, Hasan; Engin, Tahsin [The University of Sakarya, Faculty of Engineering, Department of Mechanical Engineering, Esentepe Campus, 54187 Sakarya (Turkey)

2011-01-15T23:59:59.000Z

127

Comparative Analysis of Natural Convection Flows Simulated by both the Conservation and Incompressible Forms of the Navier-Stokes Equations in a Differentially-Heated Square Cavity  

SciTech Connect (OSTI)

This report illustrates a comparative study to analyze the physical differences between numerical simulations obtained with both the conservation and incompressible forms of the Navier-Stokes equations for natural convection flows in simple geometries. The purpose of this study is to quantify how the incompressible flow assumption (which is based upon constant density advection, divergence-free flow, and the Boussinesq gravitational body force approximation) differs from the conservation form (which only assumes that the fluid is a continuum) when solving flows driven by gravity acting upon density variations resulting from local temperature gradients. Driving this study is the common use of the incompressible flow assumption in fluid flow simulations for nuclear power applications in natural convection flows subjected to a high heat flux (large temperature differences). A series of simulations were conducted on two-dimensional, differentially-heated rectangular geometries and modeled with both hydrodynamic formulations. From these simulations, the selected characterization parameters of maximum Nusselt number, average Nusselt number, and normalized pressure reduction were calculated. Comparisons of these parameters were made with available benchmark solutions for air with the ideal gas assumption at both low and high heat fluxes. Additionally, we generated body force, velocity, and divergence of velocity distributions to provide a basis for further analysis. The simulations and analysis were then extended to include helium at the Very High Temperature gas-cooled Reactor (VHTR) normal operating conditions. Our results show that the consequences of incorporating the incompressible flow assumption in high heat flux situations may lead to unrepresentative results. The results question the use of the incompressible flow assumption for simulating fluid flow in an operating nuclear reactor, where large temperature variations are present. The results show that the use of the incompressible flow assumption with the Boussinesq gravitational body force approximation should be restricted to flows where the density change of a fluid particle along a pathline is negligible.

Richard C. Martineau; Ray A. Berry; Aurťlia Esteve; Kurt D. Hamman; Dana A. Knoll; Ryosuke Park; William Taitano

2009-01-01T23:59:59.000Z

128

Market-based Investment in Electricity Transmission Networks: Controllable Flow  

E-Print Network [OSTI]

in new lines, rather than small-scale network upgrades. Whereas market-based transmission investment may mitigate the problem of under- investment, it is unlikely to suffice alone and thus regulated projects by the designated transmission system... aims at transmission of bulk power to be less than small-scale AC network deepening projects; even if these AC projetcs are small scale, they may be large compared to the size of their market. The DC-interconnector projects in the USA are typically...

Brunekreeft, Gert

2004-06-16T23:59:59.000Z

129

Power flow analysis for DC voltage droop controlled DC microgrids  

E-Print Network [OSTI]

loss, such as photovoltaic panels, batteries, fuel cells, LEDs, and electronic loads, DC microgrids sharing and secondary voltage regulation can now be analytically studied, and specialized optimization of the DC microgrid, in term of systematic analysis, protection coordination design, network optimization

Chaudhary, Sanjay

130

NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis...  

Open Energy Info (EERE)

- Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005 Baseline Model Jump to: navigation, search Tool Summary LAUNCH TOOL Name: NETL - Petroleum-Based Fuels Life Cycle...

131

An analysis of the induced flow downstream between oscillating wings in a wind tunnel  

E-Print Network [OSTI]

AN ANALYSIS OF THE INDUCED FLOW DOWNSTREAM BETWEEN OSCILLATING WINGS IN A WIND TIMBAL A Thesis by BARRY ERWIN MORGAN Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE May 1970 Major Subject; Aerospace Engineering AN ANALYSIS OF THE INDUCED FLOW DOWNSTREAM BETWEEN OSCILLATING WINGS IN A WIND TUNNEL A Thesis by BARRY ERWIN MORGAN Approved as to style and content by: rman of Committee) (Hea of Depart ent...

Morgan, Barry Erwin

2012-06-07T23:59:59.000Z

132

RETROSPECTIVE: Higher-order control-flow analysis in retrospect  

E-Print Network [OSTI]

that the SSA revolution in the traditional com- piler community was essentially CPS in another guise [10 there are interesting program analyses and optimisations that require this kind of extra power. CPS as an intermediate representation based on continuation-passing style (CPS). This continued a line of work originating with Steele

Shivers, Olin

133

Optimization Online - Convergence analysis of sampling-based ...  

E-Print Network [OSTI]

Aug 19, 2014 ... Convergence analysis of sampling-based decomposition methods for risk-averse multistage stochastic convex programs.

Vincent Guigues

2014-08-19T23:59:59.000Z

134

Optimization Online - Convergence Analysis of Primal-Dual Based ...  

E-Print Network [OSTI]

Sep 24, 2014 ... Convergence Analysis of Primal-Dual Based Methods for Total Variation Minimization with Finite Element Approximation.

Wenyi Tian

2014-09-24T23:59:59.000Z

135

Non-perturbative analysis of space charge limited electron flow in critical regimes  

SciTech Connect (OSTI)

The combined Eulerian-Lagrangian formalism, developed in our previous work for studying the turn on regime of a one-dimensional diode, is extended for wider versatility and better precision in the study of the time dependent space charge limited electron flow with fixed injected current. An analytical analysis is supplemented with an approximate numerical scheme which appears to be sufficiently accurate to calculate the flow evolution until the process approaches stabilization or becomes unstable. This can be compared with properties of stationary flows and showed to be in a good agreement with them. When the stabilization is impossible, the ratio of anode to cathode currents is decreasing and thus the space charge is accumulated in the diode. We discuss the limitations of our approach and give some qualitative estimates for the flow parameters when stabilization is impossible.

Rokhlenko, A.; Lebowitz, J. L. [Department of Mathematics, Rutgers University, Piscataway, New Jersey 08854-8019 (United States)

2014-08-07T23:59:59.000Z

136

Estimates of Tracer-Based Piston-Flow Ages of Groundwater From Selected Sites: National Water-Quality Assessment  

E-Print Network [OSTI]

Estimates of Tracer-Based Piston-Flow Ages of Groundwater From Selected Sites: National Water;Estimates of Tracer-Based Piston-Flow Ages of Groundwater from Selected Sites: National Water.N., Busenberg, Eurybiades, Widman, P.K., Casile, G.C., and Wayland, J.E., 2010, Estimates of tracer-based piston

137

Fusion Engineering and Design 81 (2006) 549553 Numerical analysis of MHD flow and heat transfer in a  

E-Print Network [OSTI]

Fusion Engineering and Design 81 (2006) 549­553 Numerical analysis of MHD flow and heat transfer January 2006 Abstract MHD flow and heat transfer have been analyzed for a front poloidal channel blanket; Magnetohydrodynamics; Heat transfer 1. Introduction Using flow channel inserts (FCIs) made

Abdou, Mohamed

138

UNDERSTANDING FLOW OF ENERGY IN BUILDINGS USING MODAL ANALYSIS METHODOLOGY  

SciTech Connect (OSTI)

It is widely understood that energy storage is the key to integrating variable generators into the grid. It has been proposed that the thermal mass of buildings could be used as a distributed energy storage solution and several researchers are making headway in this problem. However, the inability to easily determine the magnitude of the buildingís effective thermal mass, and how the heating ventilation and air conditioning (HVAC) system exchanges thermal energy with it, is a significant challenge to designing systems which utilize this storage mechanism. In this paper we adapt modal analysis methods used in mechanical structures to identify the primary modes of energy transfer among thermal masses in a building. The paper describes the technique using data from an idealized building model. The approach is successfully applied to actual temperature data from a commercial building in downtown Boise, Idaho.

John Gardner; Kevin Heglund; Kevin Van Den Wymelenberg; Craig Rieger

2013-07-01T23:59:59.000Z

139

Toward compressed DMD: spectral analysis of fluid flows using sub-Nyquist-rate PIV data  

E-Print Network [OSTI]

Dynamic mode decomposition (DMD) is a powerful and increasingly popular tool for performing spectral analysis of fluid flows. However, it requires data that satisfy the Nyquist-Shannon sampling criterion. In many fluid flow experiments, such data are impossible to capture. We propose a new approach that combines ideas from DMD and compressed sensing. Given a vector-valued signal, we take measurements randomly in time (at a sub-Nyquist rate) and project the data onto a low-dimensional subspace. We then use compressed sensing to identify the dominant frequencies in the signal and their corresponding modes. We demonstrate this method using two examples, analyzing both an artificially constructed test dataset and particle image velocimetry data collected from the flow past a cylinder. In each case, our method correctly identifies the characteristic frequencies and oscillatory modes dominating the signal, proving the proposed method to be a capable tool for spectral analysis using sub-Nyquist-rate sampling.

Tu, Jonathan H; Kutz, J Nathan; Shang, Jessica K

2014-01-01T23:59:59.000Z

140

Analysis of granular flow in a pebble-bed nuclear reactor Chris H. Rycroft,1  

E-Print Network [OSTI]

Analysis of granular flow in a pebble-bed nuclear reactor Chris H. Rycroft,1 Gary S. Grest,2 James February 2006; published 24 August 2006 Pebble-bed nuclear reactor technology, which is currently being States, the Modular Pebble Bed Reactor MPBR 4,8 is a candidate for the next generation nuclear plant

Bazant, Martin Z.

Note: This page contains sample records for the topic "flow analysis base" 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

Electro-osmotic flow control for living cell analysis in microfluidic Tomasz Glawdel, Carolyn L. Ren *  

E-Print Network [OSTI]

the problems associated with the use of high electric fields required for operating electro-osmotic pumps in living cell analysis. In particular, electroporation of cell mem- branes, Joule heating, electrolysis pressure-driven flow control systems. Futai et al. (2006) developed a recircu- lating perfusion platform

Le Roy, Robert J.

142

Analysis of Fish Response to Flows in the 1991 Pasco Flume Experiments  

E-Print Network [OSTI]

1 Analysis of Fish Response to Flows in the 1991 Pasco Flume Experiments by James J. Anderson. The hypothesis of the study is that low fish guidance efficiency (FGE) at Columbia River dams may, in part, be due to fish diving when they encounter changes in water velocities. This behavior would cause fish

Washington at Seattle, University of

143

Analysis of Pt/C electrode performance in a flowing-electrolyte alkaline fuel cell  

E-Print Network [OSTI]

Analysis of Pt/C electrode performance in a flowing- electrolyte alkaline fuel cell Fikile R 17 October 2011 Accepted 18 October 2011 Available online 12 November 2011 Keywords: Alkaline fuel cell Electrode characterization X-ray micro-computed tomography Microfluidic fuel cell Carbonates a b

Kenis, Paul J. A.

144

A perturbation analysis of the unstable plastic flow pattern evolution in an aluminum alloy  

E-Print Network [OSTI]

A perturbation analysis of the unstable plastic flow pattern evolution in an aluminum alloy Seung Abstract In the tensile loading of sheet metals made from some polycrystalline aluminum alloys, a single in the uniaxial tension of polycrystalline aluminum alloys with periodic stress relaxations depends

Tong, Wei

145

Large Eddy Simulation Analysis of Flow Field Inside a High-g Combustor  

E-Print Network [OSTI]

Large Eddy Simulation Analysis of Flow Field Inside a High-g Combustor C. Heye , C. Lietz , J-compact combustors (UCC) are a technology for reducing the size of combustors. In these combustors the fuel and air results exhibit significant entrainment of fuel into recirculation zones inside the combustor, however

Raman, Venkat

146

Flow analysis and nozzle-shape optimization for the cold-gas dynamic-spray process  

E-Print Network [OSTI]

Flow analysis and nozzle-shape optimization for the cold-gas dynamic-spray process M Grujicic1*, W, maximizes the acceleration of the particles. Furthermore, it is found that if the cold-spray nozzle, a significant increase in the average velocity of the particles at the nozzle exit can be obtained

Grujicic, Mica

147

A Genetic Algorithm based Approach for Multi-Objective Data-Flow Graph Optimization  

E-Print Network [OSTI]

that the correct- ness of algebraic transformations realized by the underlying genetic operators selection shown for power optimization. In order to avoid inferior results caused by the counteracting demandsA Genetic Algorithm based Approach for Multi-Objective Data-Flow Graph Optimization Birger Landwehr

Coello, Carlos A. Coello

148

Robust Optical-Flow Based Self-Motion Estimation for a Quadrotor UAV  

E-Print Network [OSTI]

Robust Optical-Flow Based Self-Motion Estimation for a Quadrotor UAV Volker Grabe, Heinrich H. B the UAV ego-motion using a monoc- ular camera and on-board hardware. Our method exploits the continuous belonging to the dominant plane in the scene. Extensive experiments on a real quadrotor UAV demonstrate

149

Level Set Based Simulations of Two-Phase Oil-Water Flows in Pipes  

E-Print Network [OSTI]

application is the lubricated pipelining of crude oil by the addition of water. We want to e√?ciently transportLevel Set Based Simulations of Two-Phase Oil-Water Flows in Pipes Hyeseon Shim July 31, 2000 Abstract We simulate the axisymmetric pipeline transportation of oil and water numerically under

Soatto, Stefano

150

A New Model of Centrality Measure based on Bidirectional Power Flow for  

E-Print Network [OSTI]

power flow based model to evaluate the criticality in smart grid environment. Change in direction of smart grid includes various generation options, primarily in the distribution side ­ near consumers. Engagement of customers with the energy management systems is the most lucrative part of smart grid from

Pota, Himanshu Roy

151

A data flow-based structural testing technique for FBD programs Eunkyoung Jee a  

E-Print Network [OSTI]

(Nuclear Regulatory Commission) [3] mandates that software unit testing for safety-critical systemsA data flow-based structural testing technique for FBD programs Eunkyoung Jee a , Junbeom Yoo b Available online 10 March 2009 Keywords: Software testing Structural testing Test coverage criteria

152

3D MHD Free Surface Fluid Flow Simulation Based on Magnetic-Field Induction Equations  

E-Print Network [OSTI]

1 3D MHD Free Surface Fluid Flow Simulation Based on Magnetic-Field Induction Equations H.L. HUANG Huang@fusion.ucla.edu Abstract: The purpose of this paper is to present our recent efforts on 3D MHD-plane magnetic field configurations have shown that 3D MHD effects from a surface normal field gradient cause

California at Los Angeles, University of

153

A Coupled Approach for Plasma-Based Flow Control Simulations of Wing Sections  

E-Print Network [OSTI]

a role in momentum coupling, though as noted in Ref. 10 there is no significant heating of the airA Coupled Approach for Plasma-Based Flow Control Simulations of Wing Sections Datta V. Gaitonde Vehicles Directorate Kettering University Air Force Research Laboratory Flint, MI 48504 Wright

Roy, Subrata

154

Bismuth-based electrochemical stripping analysis  

DOE Patents [OSTI]

Method and apparatus for trace metal detection and analysis using bismuth-coated electrodes and electrochemical stripping analysis. Both anodic stripping voltammetry and adsorptive stripping analysis may be employed.

Wang, Joseph

2004-01-27T23:59:59.000Z

155

Naturalized plants have smaller genomes than their non-invading relatives: a flow cytometric analysis of the Czech alien flora  

E-Print Network [OSTI]

analysis of the Czech alien flora Naturalizované rostliny mají mensí genom nez neinvadující druhy than their non-invading relatives: a flow cytometric analysis of the Czech alien flora. ­ Preslia 82 in 93 alien species naturalized in the Czech Republic, belonging to 32 families, by using flow cytometry

Kratochvíl, Lukas

156

Two-phase stratified flow regime transition analysis for low gravity conditions  

E-Print Network [OSTI]

liquid, and dispersed bubble. This study lends well to stratified flow analysis because Taitel and Dukler [23] assumed an equilibrium stratified condition and developed transition models to the slug and annular regimes from this initial state. Also... This thesis follows the style of the A~lh~EllItlg. concentrated on low gravity conditions other than zero-g, such as moon gravity (1/6 g) or Mars gravity (1/3 g). This work concerns the development of a stratified flow regime transition model which...

Miller, Kathryn M.

1990-01-01T23:59:59.000Z

157

Parallel computation of Gauss-Seidel type algorithms for power flow analysis  

E-Print Network [OSTI]

, ' , are available. Stimulated by such availability, application oriented research has been initiated and has become fruitful in many areas. We will attempt to investigate some of the application issues in the area of power flow analysis. A power flow program... Line No. Bus No. Trans. No. Cap. No. Avg. Connection IEEE 14 IEEE 30 IEEE 57 IEEE 118 SCA SCB SCC SCD SCE SCF Texas 17 65 177 176 151 166 137 218 2834 14 30 57 118 133 150 128 131 105 168 2429 50 22 70 405 14 323 3...

Ongsakul, Weerakorn

1991-01-01T23:59:59.000Z

158

The backward phase flow and FBI-transform-based Eulerian Gaussian beams for the Schroedinger equation  

SciTech Connect (OSTI)

We propose the backward phase flow method to implement the Fourier-Bros-Iagolnitzer (FBI)-transform-based Eulerian Gaussian beam method for solving the Schroedinger equation in the semi-classical regime. The idea of Eulerian Gaussian beams has been first proposed in . In this paper we aim at two crucial computational issues of the Eulerian Gaussian beam method: how to carry out long-time beam propagation and how to compute beam ingredients rapidly in phase space. By virtue of the FBI transform, we address the first issue by introducing the reinitialization strategy into the Eulerian Gaussian beam framework. Essentially we reinitialize beam propagation by applying the FBI transform to wavefields at intermediate time steps when the beams become too wide. To address the second issue, inspired by the original phase flow method, we propose the backward phase flow method which allows us to compute beam ingredients rapidly. Numerical examples demonstrate the efficiency and accuracy of the proposed algorithms.

Leung Shingyu, E-mail: masyleung@ust.h [Department of Mathematics, Hong Kong University of Science and Technology, Clear Water Bay (Hong Kong); Qian Jianliang, E-mail: qian@math.msu.ed [Department of Mathematics, Michigan State University, East Lansing, MI 48824 (United States)

2010-11-20T23:59:59.000Z

159

Statistical Analysis of Microgravity Two-Phase Slug Flow via the Drift Flux Model  

E-Print Network [OSTI]

. The result was a statistically consistent microgravity slug flow data base consisting of 220 data points from 8 different experiments and the associated values for the concentration parameter, Co, and drift velocity, u_(gj). A key component for this model...

Larsen, Benjamin A

2014-05-01T23:59:59.000Z

160

Analysis of Compressible and Incompressible Flows Through See-through Labyrinth Seals  

E-Print Network [OSTI]

of the working fluid through the labyrinth seal is desirable because it improves the efficiency of the turbomachine. The carry-over coefficient, based on the divergence angle of the jet, changed with flow parameters with fixed seal geometry while earlier models...

Woo, Jeng Won

2011-08-08T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Analysis of Geothermal Reservoir Stimulation using Geomechanics-Based Stochastic Analysis of Injection-Induced Seismicity  

Broader source: Energy.gov [DOE]

This project will develop a model for seismicity-based reservoir characterization (SBRC) by combining rock mechanics; finite element modeling; geo-statistical concepts to establish relationships between micro-seismicity; reservoir flow and geomechanical characteristics.

162

Stability of hypersonic reacting stagnation flow of a detonatable gas mixture by dynamical systems analysis  

SciTech Connect (OSTI)

The stability characteristics of the reacting hypersonic flow of the fuel/oxidizer mixture in the stagnation region of a blunt body are studied. The conditions for oscillations of the combustion front are assumed to be determined mainly by the flow conditions at the stagnation region. The density at the stagnation region is assumed to be constant at hypersonic flow conditions. By assuming a simplified flow model, the time dependent flow equations, including the heat addition due to the chemical reactions, are reduced to a second-order nonlinear differential equation for the instantaneous temperature. The solutions are analyzed assuming a one-step chemical reaction with zero-order and first-order processes using dynamical systems methods. These methods are used to determine the stability boundaries in terms of the flow and chemical reaction parameters. It is shown that the zero-order reaction has nonperiodic solutions that may lead to explosion whereas the first-order and higher-order reactions may have periodic solutions indicating oscillations. The zero-order analysis also reaffirms the requirements for a minimum size blunt body for the establishment of a detonation (in agreement with classical detonation theory) and the first-order analysis indicates a minimum body size for establishment of oscillations. The oscillation frequencies are calculated using the small perturbation approximation for the temperature oscillations. These frequencies are compared with results from published data on spheres and hemisphere cylindrical bodies fired into hydrogen-oxygen and acetylene oxygen mixtures. Very good agreement is found between the measured and calculated results.

Tivanov, G.; Rom, J. [Technion-Israel Inst. of Tech., Haifa (Israel)] [Technion-Israel Inst. of Tech., Haifa (Israel)

1995-12-01T23:59:59.000Z

163

Asset-based poverty analysis in rural Bangladesh: A comparison of principal component analysis and  

E-Print Network [OSTI]

1 Asset-based poverty analysis in rural Bangladesh: A comparison of principal component analysis not be regarded as the views of SRI or The University of Leeds. #12;3 Asset-based poverty analysis in rural The trend towards multi-dimensional poverty assessment ..................... 5 Principal component analysis

Mound, Jon

164

In Depth Analysis of AVCOAT TPS Response to a Reentry Flow  

SciTech Connect (OSTI)

Modeling of the high altitude portion of reentry vehicle trajectories with DSMC or statistical BGK solvers requires accurate evaluation of the boundary conditions at the ablating TPS surface. Presented in this article is a model which takes into account the complex ablation physics including the production of pyrolysis gases, and chemistry at the TPS surface. Since the ablation process is time dependent the modeling of the material response to the high energy reentry flow starts with the solution of the rarefied flow over the vehicle and then loosely couples with the material response. The objective of the present work is to carry out conjugate thermal analysis by weakly coupling a flow solver to a material thermal response model. The latter model solves the one dimensional heat conduction equation accounting for the pyrolysis process that takes place in the reaction zone of an ablative thermal protection system (TPS) material. An estimate of the temperature range within which the pyrolysis reaction (decomposition and volatilization) takes place is obtained from Ref. [1]. The pyrolysis reaction results in the formation of char and the release of gases through the porous charred material. These gases remove additional amount of heat as they pass through the material, thus cooling the material (the process known as transpiration cooling). In the present work, we incorporate the transpiration cooling model in the material thermal response code in addition to the pyrolysis model. The flow in the boundary layer and in the vicinity of the TPS material is in the transitional flow regime. Therefore, we use a previously validated statistical BGK method to model the flow physics in the vicinity of the micro-cracks, since the BGK method allows simulations of flow at pressures higher than can be computed using DSMC.

Titov, E. V.; Kumar, Rakesh; Levin, D. A. [Pennsylvania State University, University Park, PA 16802 (United States)

2011-05-20T23:59:59.000Z

165

Ring diagram analysis of near-surface flows in the Sun  

E-Print Network [OSTI]

Ring diagram analysis of solar oscillation power spectra obtained from MDI data is carried out to study the velocity fields in the outer part of the solar convection zone. The three dimensional power spectra are fitted to a model which has a Lorentzian profile in frequency and which includes the advection of the wave front by horizontal flows, to obtain the two components of the sub-surface flows as a function of the horizontal wave number and radial order of the oscillation modes. This information is then inverted using OLA and RLS methods to infer the variation in horizontal flow velocity with depth. The average rotation velocity at different latitudes obtained by this technique agrees reasonably with helioseismic estimates made using frequency splitting data. The shear layer just below the solar surface appears to consist of two parts with the outer part up to a depth of 4 Mm, where the velocity gradient does not show any reversal up to a latitude of 60 degrees. In the deeper part the velocity gradient shows reversal in sign around a latitude of 55 degrees. The zonal flow velocities inferred in the outermost layers appears to be similar to those obtained by other measurements. A meridional flow from equator polewards is found. It has a maximum amplitude of about 30 m/s near the surface and the amplitude is nearly constant in the outer shear layer.

Sarbani Basu; H. M. Antia; S. C. Tripathy

1998-09-24T23:59:59.000Z

166

Studies of the analyte-carrier interface in flow injection analysis. Final report, June 1, 1987--January 31, 1992  

SciTech Connect (OSTI)

Chemical analysis in flowing solution is popular for automation of classical methods. However, most of the classical methods are not specific enough for direct multicomponent analysis of simple mixtures. This research project has the goals of study of rapid multicomponent analysis of transient species in flowing media, and investigations of chemical reactions at interfaces and of effects of competition on distribution of products from interfacial reaction. This report summarizes work done over the past 4.5 years; support has been terminated.

Brown, S.D.

1992-12-31T23:59:59.000Z

167

analysis tool based: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Visualization Requirements, Implementation Future Work 12 Weidendorfer, Josef 2 Web-based pre-Analysis Tools CERN Preprints Summary: The project consists in the initial...

168

Local analysis of three-dimensional air cooled condenser using a two-phase flow diagram  

SciTech Connect (OSTI)

This paper is concerned with the development and application of an analytical method for the performance prediction of air cooled condensers. A local analysis is employed in which the condenser is considered as a matrix of small basic heat transfer modules. For each element, local film coefficients for both the air and the condensing fluid are determined according to the existing local conditions, including the two-phase flow regime. The paper considers an application of the method to heat pump condensing.

Parise, J.A.R.; Cartwright

1983-07-01T23:59:59.000Z

169

A parallel and matrix free framework for global stability analysis of compressible flows  

E-Print Network [OSTI]

An numerical iterative framework for global modal stability analysis of compressible flows using a parallel environment is presented. The framework uses a matrix-free implementation to allow computations of large scale problems. Various methods are tested with regard to convergence acceleration of the framework. The methods consist of a spectral Cayley transformation used to select desired Eigenvalues from a large spectrum, an improved linear solver and a parallel block-Jacobi preconditioning scheme.

Henze, O; Sesterhenn, J

2015-01-01T23:59:59.000Z

170

ANALYSIS OF TWO-PHASE FLOW MODELS WITH TWO MOMENTUM EQUATIONS.  

SciTech Connect (OSTI)

An analysis of the standard system of differential equations describing multi-speed flows of multi-phase media is performed. It is proved that the Cauchy problem, as posed in most best-estimate thermal-hydraulic codes, results in unstable solutions and potentially unreliable description of many physical phenomena. A system of equations, free from instability effects, is developed allowing more rigorous numerical modeling.

KROSHILIN,A.E.KROSHILIN,V.E.KOHUT,P.

2004-03-15T23:59:59.000Z

171

An individual-based instream flow model for coexisting populations of brown and rainbow trout  

SciTech Connect (OSTI)

This report describes an individual-based model for sympatric populations of brown and rainbow trout in a stream habitat. Hatchery rainbow trout are included as a third species. The model provides a tool for predicting flow effects on trout populations by linking the hydraulic component of the Physical Habitat Simulation (PHABSIM) methodology and an individual-based population modeling approach. PHABSIM simulates the spatial distribution of depth and velocity at different flows. The individual-based model simulates the reproduction, foraging, consumption, energetic costs, growth, habitat utilization, movement, and mortality of individual fish, and enables population attributes to be determined from relevant attributes of individual fish. The spatially explicit nature of the model permits evaluation of behavioral responses used by fish to mitigate temporary setbacks in habitat quality. This linked mechanistic modeling approach readily lends itself to the iterative process of making predictions, testing against field data, improving the model, and making more predictions. The model has been applied to a stream segment in the Tule River, California. Physical and biological data from this site are used as input to the model. Calibrating the model to abundance data was relatively easy because values for mortality parameters were not strongly constrained by empirical data. Calibrating the model to observed growth rates and habitat use was more challenging. The primary reason for developing this model has been to provide a new and complementary tool to PHABSIM that can be used in instream-flow assessments.

Van Winkle, W.; Jager, H.I.; Holcomb, B.D.

1996-03-01T23:59:59.000Z

172

Time-resolved fuel injector flow characterisation based on 3D laser Doppler vibrometry  

E-Print Network [OSTI]

In order to enable investigations of the fuel flow inside unmodified injectors, we have developed a new experimental approach to measure time-resolved vibration spectra of diesel nozzles using a three dimensional laser vibrometer. The technique we propose is based on the triangulation of the vibrometer and fuel pressure transducer signals, and enables the quantitative characterisation of quasi-cyclic internal flows without requiring modifications to the injector, the working fluid, or limiting the fuel injection pressure. The vibrometer, which uses the Doppler effect to measure the velocity of a vibrating object, was used to scan injector nozzle tips during the injection event. The data were processed using a discrete Fourier transform to provide time-resolved spectra for valve-closed-orifice, minisac and microsac nozzle geometries, and injection pressures ranging from 60 to 160MPa, hence offering unprecedented insight into cyclic cavitation and internal mechanical dynamic processes. A peak was consistently f...

Crua, Cyril

2015-01-01T23:59:59.000Z

173

Security enhancements for FPGA-based MPSoCs: a boot-to-runtime protection flow for an embedded  

E-Print Network [OSTI]

Security enhancements for FPGA-based MPSoCs: a boot-to-runtime protection flow for an embedded solutions to securely boot a bitstream and the associated OS while runtime transactions are not protected. This work proposes a full boot-to-runtime protection flow of an embedded Linux kernel during boot

Paris-Sud XI, Université de

174

Value based analysis of acquisition portfolios  

E-Print Network [OSTI]

Currently, program-funding allocation is based on program performance. Funding cuts commonly lead to a poor reflection on the program management assigned to the given program. If additional factors such as program risk and ...

Burgess, Cheri Nicole Markt

2010-01-01T23:59:59.000Z

175

Thickness-based adaptive mesh refinement methods for multi-phase flow simulations with thin regions  

SciTech Connect (OSTI)

In numerical simulations of multi-scale, multi-phase flows, grid refinement is required to resolve regions with small scales. A notable example is liquid-jet atomization and subsequent droplet dynamics. It is essential to characterize the detailed flow physics with variable length scales with high fidelity, in order to elucidate the underlying mechanisms. In this paper, two thickness-based mesh refinement schemes are developed based on distance- and topology-oriented criteria for thin regions with confining wall/plane of symmetry and in any situation, respectively. Both techniques are implemented in a general framework with a volume-of-fluid formulation and an adaptive-mesh-refinement capability. The distance-oriented technique compares against a critical value, the ratio of an interfacial cell size to the distance between the mass center of the cell and a reference plane. The topology-oriented technique is developed from digital topology theories to handle more general conditions. The requirement for interfacial mesh refinement can be detected swiftly, without the need of thickness information, equation solving, variable averaging or mesh repairing. The mesh refinement level increases smoothly on demand in thin regions. The schemes have been verified and validated against several benchmark cases to demonstrate their effectiveness and robustness. These include the dynamics of colliding droplets, droplet motions in a microchannel, and atomization of liquid impinging jets. Overall, the thickness-based refinement technique provides highly adaptive meshes for problems with thin regions in an efficient and fully automatic manner.

Chen, Xiaodong [The State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 (China); Yang, Vigor, E-mail: vigor.yang@aerospace.gatech.edu [School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150 (United States)

2014-07-15T23:59:59.000Z

176

Monitoring- Based Commissioning with Advanced EMIS Analysis  

E-Print Network [OSTI]

?EMIS ? The?cornerstone?of?MBCx?is?a?comprehensive? Energy?Management?Information?System?(EMIS) An?EMIS?is?an?analytical?engine?with?capabilities?above?and? beyond?that?of?a?BAS.??Capabilities?include?up?to: ? Utility?cost?and?billing?analysis ? Enhanced...

Ratkovich, B.

2013-01-01T23:59:59.000Z

177

Stress-induced patterns in ion-irradiated Silicon: a model based on anisotropic plastic flow  

E-Print Network [OSTI]

We present a model for the effect of stress on thin amorphous films that develop atop ion-irradiated silicon, based on the mechanism of ion-induced anisotropic plastic flow. Using only parameters directly measured or known to high accuracy, the model exhibits remarkably good agreement with the wavelengths of experimentally-observed patterns, and agrees qualitatively with limited data on ripple propagation speed. The predictions of the model are discussed in the context of other mechanisms recently theorized to explain the wavelengths, including extensive comparison with an alternate model of stress.

Scott A. Norris

2012-07-24T23:59:59.000Z

178

Molecule-based approach for computing chemical-reaction rates in upper atmosphere hypersonic flows.  

SciTech Connect (OSTI)

This report summarizes the work completed during FY2009 for the LDRD project 09-1332 'Molecule-Based Approach for Computing Chemical-Reaction Rates in Upper-Atmosphere Hypersonic Flows'. The goal of this project was to apply a recently proposed approach for the Direct Simulation Monte Carlo (DSMC) method to calculate chemical-reaction rates for high-temperature atmospheric species. The new DSMC model reproduces measured equilibrium reaction rates without using any macroscopic reaction-rate information. Since it uses only molecular properties, the new model is inherently able to predict reaction rates for arbitrary nonequilibrium conditions. DSMC non-equilibrium reaction rates are compared to Park's phenomenological non-equilibrium reaction-rate model, the predominant model for hypersonic-flow-field calculations. For near-equilibrium conditions, Park's model is in good agreement with the DSMC-calculated reaction rates. For far-from-equilibrium conditions, corresponding to a typical shock layer, the difference between the two models can exceed 10 orders of magnitude. The DSMC predictions are also found to be in very good agreement with measured and calculated non-equilibrium reaction rates. Extensions of the model to reactions typically found in combustion flows and ionizing reactions are also found to be in very good agreement with available measurements, offering strong evidence that this is a viable and reliable technique to predict chemical reaction rates.

Gallis, Michail A.; Bond, Ryan Bomar; Torczynski, John Robert

2009-08-01T23:59:59.000Z

179

Analysis of Mass Flow and Enhanced Mass Flow Methods of Flashing Refrigerant-22 from a Small Vessel  

E-Print Network [OSTI]

The mass flow characteristics of flashing Refrigerant-22 from a small vessel were investigated. A flash boiling apparatus was designed and built. It was modeled after the flashing process encountered by the accumulator of air-source heat pump...

Nutter, Darin Wayne

180

An elastic-perfectly plastic flow model for finite element analysis of perforated materials  

SciTech Connect (OSTI)

This paper describes the formulation of an elastic-perfectly plastic flow theory applicable to equivalent solid [EQS] modeling of perforated materials. An equilateral triangular array of circular penetrations is considered. The usual assumptions regarding geometry and loading conditions applicable to the development of elastic constants for EQS modeling of perforated plates are considered to apply here. An elastic-perfectly plastic [EPP] EQS model is developed for a collapse surface that includes fourth-order stress terms. The fourth order yield function has been shown to be appropriate for plates with a triangular array of circular holes. A complete flow model is formulated using the consistent tangent modulus approach based on the fourth order yield function.

Jones, D.P.; Gordon, J.L.; Hutula, D.N.; Banas, D.; Newman, J.B.

1999-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Uncertainty Analysis Framework - Hanford Site-Wide Groundwater Flow and Transport Model  

SciTech Connect (OSTI)

Pacific Northwest National Laboratory (PNNL) embarked on a new initiative to strengthen the technical defensibility of the predictions being made with a site-wide groundwater flow and transport model at the U.S. Department of Energy Hanford Site in southeastern Washington State. In FY 2000, the focus of the initiative was on the characterization of major uncertainties in the current conceptual model that would affect model predictions. The long-term goals of the initiative are the development and implementation of an uncertainty estimation methodology in future assessments and analyses using the site-wide model. This report focuses on the development and implementation of an uncertainty analysis framework.

Cole, Charles R.; Bergeron, Marcel P.; Murray, Christopher J.; Thorne, Paul D.; Wurstner, Signe K.; Rogers, Phillip M.

2001-11-09T23:59:59.000Z

182

Linear analysis of time dependent properties of Child-Langmuir flow  

SciTech Connect (OSTI)

We continue our analysis of the time dependent behavior of the electron flow in the Child-Langmuir system, removing an approximation used earlier. We find a modified set of oscillatory decaying modes with frequencies of the same order as the inverse of the electron transient time. This range (typically MHz) allows simple experimental detection and maybe exploitation. We then study the time evolution of the current in response to a slow change of the anode voltage where the same modes of oscillations appear too. The cathode current in this case is systematically advanced or retarded depending on the direction of the voltage change.

Rokhlenko, A. [Department of Mathematics, Rutgers University, Piscataway, New Jersey 08854-8019 (United States)

2013-01-15T23:59:59.000Z

183

A knowledge based constructability analysis prototype  

E-Print Network [OSTI]

costs, and project schedule prior to producing drawings; and when required, a cost analysis of alternatives to define the lowest total installed cost. " (O' Connor and Tucker 1983) A professional group, in lieu of a definition, has developed a...: ". . . an organized, creative approach which has for its purpose the effective identification of unnecessary costs, i. e. costs which provide neither quality nor use nor life nor appearance nor customer features. " (Barrie and Paulson 1984) Value engineering...

Winter, Laura Jo

1988-01-01T23:59:59.000Z

184

Bead-Based Assays for Biodetection: From Flow-Cytometry to Microfluidics  

SciTech Connect (OSTI)

ABSTRACT The potential for the use of biological agents by terrorists is a real threat. Two approaches for detection of biological species will be described: 1) The use of microbead arrays for multiplexed flow cytometry detection of cytokines and botulinum neurotoxin simulant, and 2) a microfluidic platform for capture and separation of different size superparamagnetic nanoparticles followed by on-chip fluorescence detection of the sandwich complex. The methods and automated fluidic systems used for trapping functionalized microbeads will be described. This approach allows sample, assay reagents, and wash solutions to be perfused over a micro-column of beads, resulting in faster and more sensitive assays. The automated fluidic approach resulted in up to five-fold improvements in assay sensitivity/speed as compared to identical assays performed in a typical manual batch mode. A second approach for implementing multiplexed bead-based assays without using flow cytometry detection is currently under development. The goal of the microfluidic-based approach is to achieve rapid (<20 minutes), multiplexed (> 3 bioagents) detection using a simple and low-cost, integrated microfluidic/optical detection platform. Using fiber-optic guided laser-induced fluorescence, assay detection limits were shown to be in the 100ís of picomolar range (10ís of micrograms per liter) for botulinum neurotoxin simulant without any optimization of the microfluidic device or optical detection approach. Video taping magnetic nanoparticle capture and release was used to improve understanding of the process and revealed interesting behavior.

Ozanich, Richard M.; Antolick, Kathryn C.; Bruckner-Lea, Cindy J.; Bunch, Kyle J.; Dockendorff, Brian P.; Grate, Jay W.; Nash, Michael A.; Tyler, Abby J.

2009-05-04T23:59:59.000Z

185

Diagnostics based on thermodynamic analysis of performance of steam turbines: Case histories  

SciTech Connect (OSTI)

The purpose of this paper is to describe some types of failures which have occurred with the ENEL stock of fossil-fuel steam turbines over the last 5--7 years. This paper also presents the corresponding thermodynamic analysis of turbine parameters which permitted failure diagnosis and pre-scheduled opening of the turbine. The examined failures concern: (1) in-service rupture of the bell seal retainer nut between a SH steam inlet sleeve and the inner HP/IP cylinder, on turbines with a main steam inlet system with bell seals; (2) incorrect assembly of pressure seal rings between steam inlet sleeves and the inner cylinder on turbines with a main steam inlet system with pressure seal rings during a scheduled outage; (3) steam flow path restriction in IP turbine inlet; (4) steam flow path restriction in 1st HP turbine stage nozzles; and (5) steam flow path restriction in 2nd HP turbine stage vanes. Thermodynamic failure analysis and the subsequent analysis of turbine damage (mechanical and financial) enabled condition-based maintenance operations to be carried out.

Tirone, G.; Arrighi, L.; Bonifacino, L.

1998-07-01T23:59:59.000Z

186

Defect site prediction based upon statistical analysis of fault signatures  

E-Print Network [OSTI]

Good failure analysis is the ability to determine the site of a circuit defect quickly and accurately. We propose a method for defect site prediction that is based on a site's probability of excitation, making no assumptions about the type...

Trinka, Michael Robert

2004-09-30T23:59:59.000Z

187

Development of a Water Based, Critical Flow, Non-Vapor Compression cooling Cycle  

SciTech Connect (OSTI)

Expansion of a high-pressure liquid refrigerant through the use of a thermostatic expansion valve or other device is commonplace in vapor-compression cycles to regulate the quality and flow rate of the refrigerant entering the evaporator. In vapor-compression systems, as the condensed refrigerant undergoes this expansion, its pressure and temperature drop, and part of the liquid evaporates. We (researchers at Kansas State University) are developing a cooling cycle that instead pumps a high-pressure refrigerant through a supersonic converging-diverging nozzle. As the liquid refrigerant passes through the nozzle, its velocity reaches supersonic (or critical-flow) conditions, substantially decreasing the refrigerantís pressure. This sharp pressure change vaporizes some of the refrigerant and absorbs heat from the surrounding conditions during this phase change. Due to the design of the nozzle, a shockwave trips the supersonic two-phase refrigerant back to the starting conditions, condensing the remaining vapor. The critical-flow refrigeration cycle would provide space cooling, similar to a chiller, by running a secondary fluid such as water or glycol over one or more nozzles. Rather than utilizing a compressor to raise the pressure of the refrigerant, as in a vapor-cycle system, the critical-flow cycle utilizes a high-pressure pump to drive refrigerant liquid through the cooling cycle. Additionally, the design of the nozzle can be tailored for a given refrigerant, such that environmentally benign substances can act as the working fluid. This refrigeration cycle is still in early-stage development with prototype development several years away. The complex multi-phase flow at supersonic conditions presents numerous challenges to fully understanding and modeling the cycle. With the support of DOE and venture-capital investors, initial research was conducted at PAX Streamline, and later, at Caitin. We (researchers at Kansas State University) have continued development of the cycle and have gained an in-depth understanding of the governing fundamental knowledge, based on the laws of physics and thermodynamics and verified with our testing results. Through this research, we are identifying optimal working fluid and operating conditions to eventually demonstrate the core technology for space cooling or other applications.

Hosni, Mohammad H.

2014-03-30T23:59:59.000Z

188

A Markov Decision Process based Flow Assignment Framework for Heterogeneous Network Access  

E-Print Network [OSTI]

Engineering, Stanford University, Stanford, CA 94305, USA Varun Sharma Lehman Brothers Inc., India Abstract an optimal policy for allocation of flows to different networks. The optimal policy maximizes, under of the flow utilities. The flow assignment policy is periodically updated and is consulted by the flows

Alpcan, Tansu

189

Fuel Cell System Improvement for Model-Based Diagnosis Analysis  

E-Print Network [OSTI]

Fuel Cell System Improvement for Model-Based Diagnosis Analysis Philippe Fiani & Michel Batteux of a model of a fuel cell system, in order to make it usable for model- based diagnosis methods. A fuel cell for the fuel cell stack but also for the system environment. In this paper, we present an adapted library which

Paris-Sud XI, Universitť de

190

AN ANALYSIS OF FORECAST BASED REORDER POINT POLICIES : THE BENEFIT  

E-Print Network [OSTI]

AN ANALYSIS OF FORECAST BASED REORDER POINT POLICIES : THE BENEFIT OF USING FORECASTS Mohamed Zied Ch^atenay-Malabry Cedex, France Abstract: In this paper, we analyze forecast based inventory control policies for a non-stationary demand. We assume that forecasts and the associated uncertainties are given

Paris-Sud XI, Université de

191

Analysis and Model-Based Control of Servomechanisms With Friction  

E-Print Network [OSTI]

Analysis and Model-Based Control of Servomechanisms With Friction Evangelos G. Papadopoulos e Engineering, National Technical University of Athens, 15780 Athens, Greece Friction is responsible for several, model-based feedback compensation is studied for servomechanism tracking tasks. Several kinetic friction

Papadopoulos, Evangelos

192

Patent Citation Analysis: Calculating Science linkage based on Citing Motivation  

E-Print Network [OSTI]

1 Patent Citation Analysis: Calculating Science linkage based on Citing Motivation Rui Li used patent bibliometric indicator to measure patent linkage to scientific research based on the frequency of citations to scientific papers within the patent. Science linkage is also regarded as noisy

Menczer, Filippo

193

MULTI-POLLUTANT CONTROL USING MEMBRANE--BASED UP-FLOW WET ELECTROSTATIC PRECIPITATION  

SciTech Connect (OSTI)

This is the Final Report of the ''Multi-Pollutant Control Using Membrane-Based Up-flow Wet Electrostatic Precipitation'' project funded by the US Department of Energy's National Energy Technology Laboratory under DOE Award No. DE-FC26-02NT41592 to Croll-Reynolds Clean Air Technologies (CRCAT). In this 18 month project, CRCAT and its team members conducted detailed emission tests of metallic and new membrane collection material within a wet electrostatic precipitator (WESP) at First Energy's Penn Power's Bruce Mansfield (BMP) plant in Shippingport, Pa. The Membrane WESP was designed to be as similar as the metallic WESP in terms of collection area, air-flow, and electrical characteristics. Both units are two-field units. The membrane unit was installed during the 2nd and 3rd quarters of 2003. Testing of the metallic unit was performed to create a baseline since the Mansfield plant had installed selective catalytic reduction equipment for NOx control and a sodium bisulfate injection system for SO3 control during the spring of 2003. Tests results on the metallic WESP were consistent with previous testing for PM2.5, SO3 mist and mercury. Testing on the membrane WESP demonstrated no adverse impact and equivalent removal efficiencies as that of the metallic WESP. Testing on both units was performed at 8,000 acfm and 15,000 acfm. Summary results are shown.

James Reynolds

2004-10-29T23:59:59.000Z

194

Environmental Analysis of the Coal-based Power Production with Amine-based Carbon Capture  

E-Print Network [OSTI]

Environmental Analysis of the Coal-based Power Production with Amine-based Carbon Capture J. To capture carbon dioxide from fossil fuel power plants and to store it in geological formations (CCS at the beginning. From an electricity generator's perspective the amine based carbon capture offers some advantages

195

Diagnostics based on thermodynamic analysis of performance of steam turbines: case histories  

SciTech Connect (OSTI)

The purpose of this paper is to describe some types of failures which have occurred with the ENEL stock of fossil-fuel steam turbines over the last 5--7 years. This paper also presents the corresponding thermodynamic analysis of turbine parameters which permitted failure diagnosis and pre-scheduled opening of the turbine. The examined failures concern: in-service rupture of the bell seal retainer nut between the SH steam inlet sleeves and the inner HP/IP cylinder, on turbines with a main steam inlet system with bell seals; incorrect assembly of pressure seal rings between steam inlet sleeves and the inner cylinder on turbines with a main steam inlet system with pressure seal rings during a scheduled outage; and steam flow path restriction in IP turbine inlet. Thermodynamic failure analysis and the subsequent analysis of turbine damage (mechanical and financial) enabled condition-based maintenance operations to be carried out.

Tirone, G.; Arrighi, L.; Bonifacino, L.

1996-12-31T23:59:59.000Z

196

Complex-Wide Waste Flow Analysis V1.0 verification and validation report  

SciTech Connect (OSTI)

The complex-wide waste flow analysis model (CWWFA) was developed to assist the Department of Energy (DOE) Environmental Management (EM) Office of Science and Technology (EM-50) to evaluate waste management scenarios with emphasis on identifying and prioritizing technology development opportunities to reduce waste flows and public risk. In addition, the model was intended to support the needs of the Complex-Wide Environmental Integration (EMI) team supporting the DOE`s Accelerating Cleanup: 2006 Plan. CWWFA represents an integrated environmental modeling system that covers the life cycle of waste management activities including waste generation, interim process storage, retrieval, characterization and sorting, waste preparation and processing, packaging, final interim storage, transport, and disposal at a final repository. The CWWFA shows waste flows through actual site-specific and facility-specific conditions. The system requirements for CWWFA are documented in the Technical Requirements Document (TRD). The TRD is intended to be a living document that will be modified over the course of the execution of CWWFA development. Thus, it is anticipated that CWWFA will continue to evolve as new requirements are identified (i.e., transportation, small sites, new streams, etc.). This report provides a documented basis for system verification of CWWFA requirements. System verification is accomplished through formal testing and evaluation to ensure that all performance requirements as specified in the TRD have been satisfied. A Requirement Verification Matrix (RVM) was used to map the technical requirements to the test procedures. The RVM is attached as Appendix A. Since February of 1997, substantial progress has been made toward development of the CWWFA to meet the system requirements. This system verification activity provides a baseline on system compliance to requirements and also an opportunity to reevaluate what requirements need to be satisfied in FY-98.

Hsu, K.M.; Lundeen, A.S.; Oswald, K.B.; Shropshire, D.E.; Robinson, J.M.; West, W.H.

1997-11-21T23:59:59.000Z

197

Kinetic analysis of 18F-fluorodihydrorotenone as a deposited myocardial flow tracer: Comparison to thallium-201.  

SciTech Connect (OSTI)

The goal of this investigation was to assess the accuracy of 18F-fluorodihydrorotenone (18F-FDHR) as a new deposited myocardial flow tracer and compare the results to those for 201Tl. Methods. The kinetics of these flow tracers were evaluated in 22 isolated, erythrocyte- and albumin-perfused rabbit hearts over a flow range encountered in patients. The two flow tracers plus a vascular reference tracer (131I-albumin) were introduced as a bolus through a port just above the aortic cannula. Myocardial extraction, retention, washout, and uptake parameters were computed from the venous outflow curves using the multiple indicator dilution technique and spectral analysis. Results. The mean initial extraction fractions of 18F-FDHR (0.85 +- 0.07) and 201Tl (0.87 +- 0.05) were not significantly different, although the initial extraction fraction for 18F-FDHR declined with flow (P < 0.0001), whereas the initial extraction fraction of 201Tl did not. Washout of 201Tl was faster (P < 0.001) and more affected by flow (P < 0.05) than 18F-FDHR washout. Except for initial extraction fraction, 18F-FDHR retention was greater (P < 0.001) and less affected by flow (P < 0.05) than 201Tl retention. Reflecting its superior retention, net uptake of 18F-FDHR was better correlated with flow than 201Tl uptake at both one and fifteen minutes after tracer introduction (P < 0.0001 for both comparisons). Conclusion. The superior correlation of 18F-FDHR uptake with flow indicates that it is a better flow tracer than 201Tl in the isolated rabbit heart. Compared to the other currently available positron-emitting flow tracers (82Rb, 13N-ammonia, and 15O-water), 18F-FDHR has the potential of providing excellent image resolution without the need for an on-site cyclotron.

Marshall, Robert C.; Powers-Risius, Patricia; Reutter, Bryan W.; O'Neil, James P.; La Belle, Michael; Huesman, Ronald H.; VanBrocklin, Henry F.

2004-03-01T23:59:59.000Z

198

Viscous potential flow analysis of electrified miscible finitely conducting fluid through porous media  

SciTech Connect (OSTI)

In this work, a viscous potential flow analysis is used to investigate capillary surface waves between two horizontal finite fluid layers. The two layers have finite conductivities and admit mass and heat transfer. A general dispersion relation is derived. The presence of finite conductivities together with the dielectric permeabilities makes the horizontal electric field play a dual role in the stability criterion. The phenomenon of negative viscosity is observed. A new growth rate parameter, depending on the kinematical viscosity of the lower fluid layer, is found and has a stabilizing effect on the unstable modes. The growth rates and neutral stability curve are given and applied to air-water interface. The effects of various parameters are discussed for the Kelvin-Helmholtz and the Rayleigh-Taylor instabilities.

Obied Allah, M. H. [Department of Mathematics, Faculty of Science, Assiut University, Assiut (Egypt)

2013-04-15T23:59:59.000Z

199

Flutter analysis of a cascade of staggered blades in subsonic flow  

E-Print Network [OSTI]

), the real part becomes, [tKK]P- [zK(i+~C )+ K(Mt- ? 'zC )]P+ [(Mti - S z) - z(IC - Mz C + StC ? SzC ) (C C - C C + C C - C C )] = 0 (51) zzR raxR zz I mui sai mzI znR mzR ' and the imagi nary part becomes, [K C I - z K C I] P + [StC I IC I + Ms C I Sz...FLUTTER ANALYSIS OF A CASCADE OF STAGGERED BLADES IN SUBSONIC FLOW A Thesis by LOUIS KRONENBERGER, JR. Submitted to the Graduate College of Texas A&M Uni vers i ty in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE...

Kronenberger, Louis

1977-01-01T23:59:59.000Z

200

Multifractal detrended fluctuation analysis of combustion flames in four-burner impinging entrained-flow gasifier  

E-Print Network [OSTI]

On a laboratory-scale testing platform of impinging entrained-flow gasifier with four opposed burners, the flame images for diesel combustion and gasification process were measured with a single charge coupled device (CCD) camera. The two-dimensional multifractal detrended fluctuation analysis was employed to investigate the multifractal nature of the flame images. Sound power-law scaling in the annealed average of detrended fluctuations was unveiled when the order $q>0$ and the multifractal feature of flame images were confirmed. Further analyses identified two multifractal parameters, the minimum and maximum singularity $\\alpha_{\\min}$ and $\\alpha_{\\max}$, serving as characteristic parameters of the multifractal flames. These two characteristic multifractal parameters vary with respect to different experimental conditions.

Niu, Miao-Ren; Yan, Zhuo-Yong; Guo, Qing-Hua; Liang, Qin-Feng; Wang, Fu-Chen; Yu, Zun-Hong

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Mixed Aleatory/Epistemic Uncertainty Quantification for Hypersonic Flows via Gradient-Based Optimization  

E-Print Network [OSTI]

Mixed Aleatory/Epistemic Uncertainty Quantification for Hypersonic Flows via Gradient/aleatory uncertainties is demonstrated within the context of hypersonic flows. Specifically, this work focuses in which experimental data is difficult or impossible to obtain, as is the case with hypersonic flows

Anitescu, Mihai

202

Nonlinear model-based control of two-phase flow in risers by feedback linearization  

E-Print Network [OSTI]

conditions at offshore oilfields. The slugging flow constitutes an unstable and highly nonlinear system and flow rates (Storkaas (2005), Storkaas and Skogestad (2007)). The oscillatory flow condition in offshore disturbances or plant changes. We aim to find a robust control solution for anti-slug control systems

Skogestad, Sigurd

203

An air flow sensor for neonatal mechanical ventilation applications based on a novel fiber-optic sensing technique  

SciTech Connect (OSTI)

In this work, a simple and low-cost air flow sensor, based on a novel fiber-optic sensing technique has been developed for monitoring air flows rates supplied by a neonatal ventilator to support infants in intensive care units. The device is based on a fiber optic sensing technique allowing (a) the immunity to light intensity variations independent by measurand and (b) the reduction of typical shortcomings affecting all biomedical fields (electromagnetic interference and patient electrical safety). The sensing principle is based on the measurement of transversal displacement of an emitting fiber-optic cantilever due to action of air flow acting on it; the fiber tip displacement is measured by means of a photodiode linear array, placed in front of the entrance face of the emitting optical fiber in order to detect its light intensity profile. As the measurement system is based on a detection of the illumination pattern, and not on an intensity modulation technique, it results less sensitive to light intensity fluctuation independent by measurand than intensity-based sensors. The considered technique is here adopted in order to develop two different configurations for an air flow sensor suitable for the measurement of air flow rates typically occurring during mechanical ventilation of newborns: a mono-directional and a bi-directional transducer have been proposed. A mathematical model for the air flow sensor is here proposed and a static calibration of two different arrangements has been performed: a measurement range up to 3.00 Multiplication-Sign 10{sup -4} m{sup 3}/s (18.0 l/min) for the mono-directional sensor and a measurement range of {+-}3.00 Multiplication-Sign 10{sup -4} m{sup 3}/s ({+-}18.0 l/min) for the bi-directional sensor are experimentally evaluated, according to the air flow rates normally encountered during tidal breathing of infants with a mass lower than 10 kg. Experimental data of static calibration result in accordance with the proposed theoretical model: for the mono-directional configuration, the coefficient of determination r{sup 2} is equal to 0.997; for the bi-directional configuration, the coefficient of determination r{sup 2} is equal to 0.990 for positive flows (inspiration) and 0.988 for negative flows (expiration). Measurement uncertainty {delta}Q of air flow rate has been evaluated by means of the propagation of distributions and the percentage error in the arrangement of bi-directional sensor ranges from a minimum of about 0.5% at -18.0 l/min to a maximum of about 9% at -12.0 l/min.

Battista, L.; Sciuto, S. A.; Scorza, A. [Department of Engineering, ROMA TRE University, via della Vasca Navale 79/81, Rome (Italy)

2013-03-15T23:59:59.000Z

204

Preliminary Analysis of Grande Ronde Basalt Formation Flow Top Transmissivity as it Relates to Assessment and Site Selection Applications for Fluid/Energy Storage and Sequestration Projects  

SciTech Connect (OSTI)

Preliminary Analysis of Grande Ronde Basalt Formation Flow Top Transmissivity as it Relates to Assessment and Site Selection Applications for Fluid/Energy Storage and Sequestration Projects

Spane, Frank A.

2013-04-29T23:59:59.000Z

205

Improvement of SRAM-based failure analysis calibrated IDDQ testing  

E-Print Network [OSTI]

the methodology and detail procedure of simulation based failure analysis t, echnique is explained. Chapter IV discusses the implementation of Iddq current calibration. Chapter V provides some examples supporting the failure analysis methodology . Conclusion... method that is often used to localize surface defects is by examining the hot emission spots. This process functions by detecting the excessive heat generated by the defective neighborhood during device operation. Heat sensitive liquid crystal...

Balachandran, Hariharan

1996-01-01T23:59:59.000Z

206

Zero-Preserving Iso-spectral Flows Based on Parallel Sums  

E-Print Network [OSTI]

Driessel ["Computing canonical forms using flows", Linear Algebra and Its Applications 2004] introduced the notion of quasi-projection onto the range of a linear transformation from one inner product space into another inner product space. Here we introduce the notion of quasi-projection onto the intersection of the ranges of two linear transformations from two inner product spaces into a third inner product space. As an application, we design a new family of iso-spectral flows on the space of symmetric matrices that preserves zero patterns. We discuss the equilibrium points of these flows. We conjecture that these flows generically converge to diagonal matrices. We perform some numerical experiments with these flows which support this conjecture. We also compare our zero preserving flows with the Toda flow.

Kenneth R. Driessel; Alf Gerisch

2006-05-09T23:59:59.000Z

207

Using the DOE Knowledge Base for Special Event Analysis  

SciTech Connect (OSTI)

The DOE Knowledge Base is a library of detailed information whose purpose is to support the United States National Data Center (USNDC) in its mission to monitor compliance with the Comprehensive Test Ban Treaty (CTBT). One of the important tasks which the USNDC must accomplish is to periodically perform detailed analysis of events of high interest, so-called "Special Events", to provide the national authority with information needed to make policy decisions. In this paper we investigate some possible uses of the Knowledge Base for Special Event Analysis (SEA), and make recommendations for improving Knowledge Base support for SEA. To analyze an event in detail, there are two basic types of data which must be used sensor-derived data (wave- forms, arrivals, events, etc.) and regiohalized contextual data (known sources, geological characteristics, etc.). Cur- rently there is no single package which can provide full access to both types of data, so for our study we use a separate package for each MatSeis, the Sandia Labs-developed MATLAB-based seismic analysis package, for wave- form data analysis, and ArcView, an ESRI product, for contextual data analysis. Both packages are well-suited to pro- totyping because they provide a rich set of currently available functionality and yet are also flexible and easily extensible, . Using these tools and Phase I Knowledge Base data sets, we show how the Knowledge Base can improve both the speed and the quality of SEA. Empirically-derived interpolated correction information can be accessed to improve both location estimates and associated error estimates. This information can in turn be used to identi~ any known nearby sources (e.g. mines, volcanos), which may then trigger specialized processing of the sensor data. Based on the location estimate, preferred magnitude formulas and discriminants can be retrieved, and any known blockages can be identified to prevent miscalculations. Relevant historic events can be identilled either by spatial proximity searches or through waveform correlation processing. The locations and waveforms of these events can then be made available for side-by-side comparison and processing. If synthetic modeling is thought to be warranted, a wide variety of rele- vant contextu~l information (e.g. crustal thickness and layering, seismic velocities, attenuation factors) can be retrieved and sent to the appropriate applications. Once formedj the synthetics can then be brought in for side-by-side comparison and fhrther processing. Based on our study, we make two general recommendations. First, proper inter-process communication between sensor data analysis software and contextual data analysis sofisvare should be developed. Second, some of the Knowl- edge Base data sets should be prioritized or winnowed to streamline comparison with observed quantities.

Armstrong, H.M.; Harris, J.M.; Young, C.J.

1998-10-20T23:59:59.000Z

208

Uncertainty and sensitivity analysis for two-phase flow in the vicinity of the repository in the 1996 performance assessment for the Waste Isolation Pilot Plant: Undisturbed conditions  

SciTech Connect (OSTI)

Uncertainty and sensitivity analysis results obtained in the 1996 performance assessment for the Waste Isolation Pilot Plant are presented for two-phase flow the vicinity of the repository under undisturbed conditions. Techniques based on Latin hypercube sampling, examination of scatterplots, stepwise regression analysis, partial correlation analysis and rank transformation are used to investigate brine inflow, gas generation repository pressure, brine saturation and brine and gas outflow. Of the variables under study, repository pressure is potentially the most important due to its influence on spallings and direct brine releases, with the uncertainty in its value being dominated by the extent to which the microbial degradation of cellulose takes place, the rate at which the corrosion of steel takes place, and the amount of brine that drains from the surrounding disturbed rock zone into the repository.

HELTON,JON CRAIG; BEAN,J.E.; ECONOMY,K.; GARNER,J.W.; MACKINNON,ROBERT J.; MILLER,JOEL D.; SCHREIBER,JAMES D.; VAUGHN,PALMER

2000-05-19T23:59:59.000Z

209

An Integrated Modeling Analysis of Unsaturated Flow Patterns in Fractured Rock  

E-Print Network [OSTI]

study, heat flow simulations use a 3-D thermal model grid (model grid, which is used for gas flow and ambient heat-flowgrid showing a smaller model domain, used for modeling gas and heat

Wu, Yu-Shu; Lu, Guoping; Zhang, Keni; Pan, Lehua; Bodvarsson, Gudmundur S.

2008-01-01T23:59:59.000Z

210

An analysis of pressure driven cross-flow through a long slot connecting two parallel channels  

SciTech Connect (OSTI)

Cross-flow between two parallel channels that were connected by a long narrow slot has been measured. The data was presented primarily in terms of transverse resistance coefficients. This data has been analyzed with momentum balances applied to both the axial and transverse components of the slot flow. The importance of wall friction to the slot flow and the necessity of calculating the axial component of the slot flow is demonstrated.

Shadday, M.A. Jr.

1992-12-31T23:59:59.000Z

211

Drift-flux analysis of two-phase flow in microgravity  

E-Print Network [OSTI]

that of the transition and annular flow regimes respectively for the microgravity data and correlated well with other R-12 microgravity data for the slug flow regime. The V[gj] for slug flow was found to be negative, which was unexpected, but the drift velocities...

Braisted, Jonathan David

2004-01-01T23:59:59.000Z

212

Improving parameter estimation and water table depth simulation in a land surface model using GRACE water storage and estimated base flow data  

E-Print Network [OSTI]

40, doi:10.1175/2008JHM993.1. Szilagyi, J. (2004), Heuristicsimulations of base flow [Szilagyi, 2004]. Although the

Lo, Min-Hui; Famiglietti, James S; Yeh, P. J.-F.; Syed, T. H

2010-01-01T23:59:59.000Z

213

CFD Analysis of Core Bypass Flow and Crossflow in the Prismatic Very High Temperature Gas-cooled Nuclear Reactor  

E-Print Network [OSTI]

if the large portion of the coolant flows into bypass gaps instead of coolant channels in which the cooling efficiency is much higher. A preliminary three dimensional steady-state CFD analysis was performed with commercial code STARCCM+ 6.04 to investigate...

Wang, Huhu 1985-

2012-12-13T23:59:59.000Z

214

Flow Injection Analysis in a Microfluidic Format Andrew M. Leach, Aaron R. Wheeler, and Richard N. Zare*  

E-Print Network [OSTI]

fabrication techniques and the use of news materials has helped the field move toward its ultimate goal of producing low-cost, disposable instrumentation. Flow injection analysis (FIA) is a widely used sampling, Polydimethylsiloxane, Microvalves #12;3 The recent trend toward miniaturized chemical assays has led to the development

Zare, Richard N.

215

Analysis of Time Series Using Compact Model-Based Descriptions  

E-Print Network [OSTI]

Analysis of Time Series Using Compact Model-Based Descriptions Hans-Peter Kriegel, Peer Kr this is a combination of the coefficients 1, . . . , 3 representing the three input time series using a function f-of-the-art compression methods. The results are visually presented in a very concise way so that the user can easily

Kriegel, Hans-Peter

216

Analysis of Preventive Maintenance in Transactions Based Software Systems  

E-Print Network [OSTI]

Analysis of Preventive Maintenance in Transactions Based Software Systems Sachin Garg 1 , Antonio''. However, it incurs some overhead. The necessity to do preventive maintenance not only in general purpose to illustrate the usefulness and applicability of the models. Keywords: Preventive Maintenance, Transactions

Telek, Miklós

217

Model-based experimental analysis for inter-polymer process  

E-Print Network [OSTI]

) + Polyethylene (PE) ARCEL TOUGH FLEXIBLE Advanced packaging material Interpenetrating polymer network productModel-based experimental analysis for inter-polymer process CMU: Weijie Lin, Lorenz T. Biegler processed in a sequential way Polymer A Polymer B Project overview Inter-polymer process #12;Project

Grossmann, Ignacio E.

218

Analysis of Semantic Building Blocks via Grobner Bases  

E-Print Network [OSTI]

for the space of multivariate polynomials in n variables, capable of expressing arbitrary sums and productsAnalysis of Semantic Building Blocks via Gr¨obner Bases Jerry Swan1 , Geoffrey K. Neumann1 for greatest common divisor from univariate to multivariate polyno- mials. Since its invention in 1965, it has

Fernandez, Thomas

219

Analysis of An Adaptive Sampler Based on Weber's Law  

E-Print Network [OSTI]

1 Analysis of An Adaptive Sampler Based on Weber's Law Onkar Dabeer Subhasis Chaudhuri Onkar Dabeer;2 Abstract Weber's law suggests a logarithmic relationship between perceptual stimuli and human perception. The Weber sampler is an adaptive, non-uniform sampling mechanism that exploits Weber's law to sample

Dabeer, Onkar

220

Model-Based Dependability Analysis of Programmable Drug Infusion Pumps  

E-Print Network [OSTI]

Model-Based Dependability Analysis of Programmable Drug Infusion Pumps Sriram Sankaranarayanan.lastname@colorado.edu Abstract. Infusion pumps are commonly used in home/hospital care to inject drugs into a patient a case-study involving an infusion pump used to manage pain through the infusion of analgesic drugs

Sankaranarayanan, Sriram

Note: This page contains sample records for the topic "flow analysis base" 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

On-board Velocity Estimation and Closed-loop Control of a Quadrotor UAV based on Optical Flow  

E-Print Network [OSTI]

On-board Velocity Estimation and Closed-loop Control of a Quadrotor UAV based on Optical Flow an efficient fall back routine for any kind of UAV (Unmanned Aerial Vehicles) since we rely solely. The results show that our approach is able to recover the ego-motion of a flying UAV in realistic conditions

222

A Comparison of Scale Estimation Schemes for a Quadrotor UAV based on Optical Flow and IMU Measurements  

E-Print Network [OSTI]

A Comparison of Scale Estimation Schemes for a Quadrotor UAV based on Optical Flow and IMU of autonomous UAV flight control, cameras are ubiquitously exploited as a cheap and effective onboard sensor linear velocity in the UAV body frame from direct measurement of the instantaneous (and non

Paris-Sud XI, Université de

223

A Multiscale Approach to Mesh-based Surface Tension Flows Nils Thurey Chris Wojtan Markus Gross Greg Turk  

E-Print Network [OSTI]

A Multiscale Approach to Mesh-based Surface Tension Flows Nils Th¨urey Chris Wojtan Markus Gross 1: Our method allows us to efficiently simulate complex surface tension phenomena such as this crown surface tension forces that is free from typical strict time step constraints. The second simulation layer

Frey, Pascal

224

Convex-Based Thermal Management for 3D MPSoCs Using DVFS and Variable-Flow Liquid Cooling  

E-Print Network [OSTI]

energy by up to 50% compared with tradi- tional state-of-the-art liquid cooling techniques. The proposedConvex-Based Thermal Management for 3D MPSoCs Using DVFS and Variable-Flow Liquid Cooling Francesco multi-processors system on chip (MPSoCs) using microfluidic cooling. The controller uses dynamic volt

De Micheli, Giovanni

225

High Performance Computing Based Methods for Simulation and Optimisation of Flow Problems.  

E-Print Network [OSTI]

??The thesis is concerned with the study of methods in high-performance computing for simulation and optimisation of flow problems that occur in the framework ofÖ (more)

Bockelmann, Hendryk

2010-01-01T23:59:59.000Z

226

VFLOW2D - A Vorte-Based Code for Computing Flow Over Elastically Supported Tubes and Tube Arrays  

SciTech Connect (OSTI)

A numerical flow model is developed to simulate two-dimensional fluid flow past immersed, elastically supported tube arrays. This work is motivated by the objective of predicting forces and motion associated with both deep-water drilling and production risers in the oil industry. This work has other engineering applications including simulation of flow past tubular heat exchangers or submarine-towed sensor arrays and the flow about parachute ribbons. In the present work, a vortex method is used for solving the unsteady flow field. This method demonstrates inherent advantages over more conventional grid-based computational fluid dynamics. The vortex method is non-iterative, does not require artificial viscosity for stability, displays minimal numerical diffusion, can easily treat moving boundaries, and allows a greatly reduced computational domain since vorticity occupies only a small fraction of the fluid volume. A gridless approach is used in the flow sufficiently distant from surfaces. A Lagrangian remap scheme is used near surfaces to calculate diffusion and convection of vorticity. A fast multipole technique is utilized for efficient calculation of velocity from the vorticity field. The ability of the method to correctly predict lift and drag forces on simple stationary geometries over a broad range of Reynolds numbers is presented.

WOLFE,WALTER P.; STRICKLAND,JAMES H.; HOMICZ,GREGORY F.; GOSSLER,ALBERT A.

2000-10-11T23:59:59.000Z

227

Higher-order compositional modeling of three-phase flow in 3D fractured porous media based on cross-flow equilibrium  

SciTech Connect (OSTI)

Numerical simulation of multiphase compositional flow in fractured porous media, when all the species can transfer between the phases, is a real challenge. Despite the broad applications in hydrocarbon reservoir engineering and hydrology, a compositional numerical simulator for three-phase flow in fractured media has not appeared in the literature, to the best of our knowledge. In this work, we present a three-phase fully compositional simulator for fractured media, based on higher-order finite element methods. To achieve computational efficiency, we invoke the cross-flow equilibrium (CFE) concept between discrete fractures and a small neighborhood in the matrix blocks. We adopt the mixed hybrid finite element (MHFE) method to approximate convective Darcy fluxes and the pressure equation. This approach is the most natural choice for flow in fractured media. The mass balance equations are discretized by the discontinuous Galerkin (DG) method, which is perhaps the most efficient approach to capture physical discontinuities in phase properties at the matrix-fracture interfaces and at phase boundaries. In this work, we account for gravity and Fickian diffusion. The modeling of capillary effects is discussed in a separate paper. We present the mathematical framework, using the implicit-pressure-explicit-composition (IMPEC) scheme, which facilitates rigorous thermodynamic stability analyses and the computation of phase behavior effects to account for transfer of species between the phases. A deceptively simple CFL condition is implemented to improve numerical stability and accuracy. We provide six numerical examples at both small and larger scales and in two and three dimensions, to demonstrate powerful features of the formulation.

Moortgat, Joachim, E-mail: jmoortgat@rerinst.org; Firoozabadi, Abbas, E-mail: abbas.firoozabadi@yale.edu

2013-10-01T23:59:59.000Z

228

Nonlinear model-based control of two-phase flow in risers by feedback linearization  

E-Print Network [OSTI]

conditions at offshore oilfields. The slugging flow constitutes an unstable and highly nonlinear system systems, stabilizing control. 1. INTRODUCTION The oscillatory flow condition in offshore multi systems tend to become unstable after some time, because of large inflow disturbances or plant changes

Skogestad, Sigurd

229

Towards Performance Measurement And Metrics Based Analysis of PLA Applications  

E-Print Network [OSTI]

This article is about a measurement analysis based approach to help software practitioners in managing the additional level complexities and variabilities in software product line applications. The architecture of the proposed approach i.e. ZAC is designed and implemented to perform preprocessesed source code analysis, calculate traditional and product line metrics and visualize results in two and three dimensional diagrams. Experiments using real time data sets are performed which concluded with the results that the ZAC can be very helpful for the software practitioners in understanding the overall structure and complexity of product line applications. Moreover the obtained results prove strong positive correlation between calculated traditional and product line measures.

Ahmed, Zeeshan

2010-01-01T23:59:59.000Z

230

Flow Characteristics Analysis of Widows' Creek Type Control Valve for Steam Turbine Control  

SciTech Connect (OSTI)

The steam turbine converts the kinetic energy of steam to mechanical energy of rotor blades in the power conversion system of fossil and nuclear power plants. The electric output from the generator of which the rotor is coupled with that of the steam turbine depends on the rotation velocity of the steam turbine bucket. The rotation velocity is proportional to the mass flow rate of steam entering the steam turbine through valves and nozzles. Thus, it is very important to control the steam mass flow rate for the load following operation of power plants. Among various valves that control the steam turbine, the control valve is most significant. The steam flow rate is determined by the area formed by the stem disk and the seat of the control valve. While the ideal control valve linearly controls the steam mass flow rate with its stem lift, the real control valve has various flow characteristic curves pursuant to the stem lift type. Thus, flow characteristic curves are needed to precisely design the control valves manufactured for the operating conditions of nuclear power plants. OMEGA (Optimized Multidimensional Experiment Geometric Apparatus) was built to experimentally study the flow characteristics of steam flowing inside the control valve. The Widows' Creek type control valve was selected for reference. Air was selected as the working fluid in the OMEGA loop to exclude the condensation effect in this simplified approach. Flow characteristic curves were plotted by calculating the ratio of the measured mass flow rate versus the theoretical mass flow rate of the air. The flow characteristic curves are expected to be utilized to accurately design and operate the control valve for fossil as well as nuclear plants. (authors)

Yoo, Yong H.; Sohn, Myoung S.; Suh, Kune Y. [PHILOSOPHIA, Inc., Seoul National University, San 56-1 Sillim-dong, Gwanak-gu, Seoul, 151-742 (Korea, Republic of)

2006-07-01T23:59:59.000Z

231

Purged window apparatus. [On-line spectroscopic analysis of gas flow systems  

DOE Patents [OSTI]

A purged window apparatus is described which utilizes tangentially injected heated purge gases in the vicinity of electromagnetic radiation transmitting windows and a tapered external mounting tube to accelerate these gases to provide a vortex flow on the window surface and a turbulent flow throughout the mounting tube thereby preventing backstreaming of flowing gases under investigation in a chamber to which a plurality of similar purged apparatus is attached with the consequent result that spectroscopic analyses can be undertaken for lengthy periods without the necessity of interrupting the flow for cleaning or replacing the windows due to contamination.

Ballard, E.O.

1982-04-05T23:59:59.000Z

232

Mechanical analysis of a cross flow filter. Final report, January 31, 1995  

SciTech Connect (OSTI)

A cross flow filter for particulate control is described. Objectives were to improve the reliability and mechanical integrity of the filter.

NONE

1998-12-31T23:59:59.000Z

233

Estimation of fracture flow parameters through numerical analysis of hydromechanical pressure pulses  

E-Print Network [OSTI]

from previous evaluations of fracture hydromechanicalof flow through fractures in rock, In: Proceedings ofsaturated, variable-aperture fracture, Geophys. Res. Lett. ,

Cappa, F.

2009-01-01T23:59:59.000Z

234

Analysis of wind turbine vibrations based on SCADA data  

E-Print Network [OSTI]

Vibrations of a wind turbine have a negative impact on its performance. Mitigating this undesirable impact requires knowledge of the relationship between the vibrations and other wind turbine parameters that could be potentially modified. Three approaches for ranking the impact importance of measurable turbine parameters on the vibrations of the drive train and the tower are discussed. They include the predictor importance analysis, the global sensitivity analysis, and the correlation coefficient analysis versed in data mining and statistics. To decouple the impact of wind speed on the vibrations of the drive train and the tower, the analysis is performed on data sets with narrow speed ranges. Wavelet analysis is applied to filter noisy accelerometer data. To exclude the impact malfunctions on the vibration analysis, the data are analyzed in a frequency domain. Data-mining algorithms are used to build models with turbine parameters of interest as inputs, and the vibrations of drive train and tower as outputs. The performance of each model is thoroughly evaluated based on metrics widely used in the wind industry. The neural network algorithm outperforms other classifiers and is considered to be the most promising approach to study wind turbine vibrations. ?DOI: 10.1115/1.4001461?

Andrew Kusiak; Zijun Zhang

2010-01-01T23:59:59.000Z

235

Automatic generation of skeletal mechanisms for ignition combustion based on level of importance analysis  

SciTech Connect (OSTI)

A level of importance (LOI) selection parameter is employed in order to identify species with general low importance to the overall accuracy of a chemical model. This enables elimination of the minor reaction paths in which these species are involved. The generation of such skeletal mechanisms is performed automatically in a pre-processing step ranking species according to their level of importance. This selection criterion is a combined parameter based on a time scale and sensitivity analysis, identifying both short lived species and species with respect to which the observable of interest has low sensitivity. In this work a careful element flux analysis demonstrates that such species do not interact in major reaction paths. Employing the LOI procedure replaces the previous method of identifying redundant species through a two step procedure involving a reaction flow analysis followed by a sensitivity analysis. The flux analysis is performed using DARS {sup copyright}, a digital analysis tool modelling reactive systems. Simplified chemical models are generated based on a detailed ethylene mechanism involving 111 species and 784 reactions (1566 forward and backward reactions) proposed by Wang et al. Eliminating species from detailed mechanisms introduces errors in the predicted combustion parameters. In the present work these errors are systematically studied for a wide range of conditions, including temperature, pressure and mixtures. Results show that the accuracy of simplified models is particularly lowered when the initial temperatures are close to the transition between low- and high-temperature chemistry. A speed-up factor of 5 is observed when using a simplified model containing only 27% of the original species and 19% of the original reactions. (author)

Loevaas, Terese [School of Engineering and Materials Sciences, Queen Mary University of London, London E1 4NS (United Kingdom); Department of Engineering and Economy, University of Tromsoe, 9012 Tromsoe (Norway)

2009-07-15T23:59:59.000Z

236

Tariff-based analysis of commercial building electricityprices  

SciTech Connect (OSTI)

This paper presents the results of a survey and analysis ofelectricity tariffs and marginal electricity prices for commercialbuildings. The tariff data come from a survey of 90 utilities and 250tariffs for non-residential customers collected in 2004 as part of theTariff Analysis Project at LBNL. The goals of this analysis are toprovide useful summary data on the marginal electricity prices commercialcustomers actually see, and insight into the factors that are mostimportant in determining prices under different circumstances. We providea new, empirically-based definition of several marginal prices: theeffective marginal price and energy-only anddemand-only prices, andderive a simple formula that expresses the dependence of the effectivemarginal price on the marginal load factor. The latter is a variable thatcan be used to characterize the load impacts of a particular end-use orefficiency measure. We calculate all these prices for eleven regionswithin the continental U.S.

Coughlin, Katie M.; Bolduc, Chris A.; Rosenquist, Greg J.; VanBuskirk, Robert D.; McMahon, James E.

2008-03-28T23:59:59.000Z

237

Anisotropic output-based adaptation with tetrahedral cut cells for compressible flows  

E-Print Network [OSTI]

Anisotropic, adaptive meshing for flows around complex, three-dimensional bodies remains a barrier to increased automation in computational fluid dynamics. Two specific advances are introduced in this thesis. First, a ...

Park, Michael Andrew

2008-01-01T23:59:59.000Z

238

Anisotropy and mantle flow in the Chile-Argentina subduction zone from shear wave splitting analysis  

E-Print Network [OSTI]

Anisotropy and mantle flow in the Chile-Argentina subduction zone from shear wave splitting subduction zone. Data is from the CHARGE network, which traversed Chile and western Argentina across two, M. L., G. Zandt, E. Triep, M. Fouch, and S. Beck (2004), Anisotropy and mantle flow in the Chile-Argentina

Fouch, Matthew J.

239

Weather data analysis based on typical weather sequence analysis. Application: energy building simulation  

E-Print Network [OSTI]

In building studies dealing about energy efficiency and comfort, simulation software need relevant weather files with optimal time steps. Few tools generate extreme and mean values of simultaneous hourly data including correlation between the climatic parameters. This paper presents the C++ Runeole software based on typical weather sequences analysis. It runs an analysis process of a stochastic continuous multivariable phenomenon with frequencies properties applied to a climatic database. The database analysis associates basic statistics, PCA (Principal Component Analysis) and automatic classifications. Different ways of applying these methods will be presented. All the results are stored in the Runeole internal database that allows an easy selection of weather sequences. The extreme sequences are used for system and building sizing and the mean sequences are used for the determination of the annual cooling loads as proposed by Audrier-Cros (Audrier-Cros, 1984). This weather analysis was tested with the datab...

David, Mathieu; Garde, Francois; Boyer, Harry

2014-01-01T23:59:59.000Z

240

Forming Teams for Teaching Programming based on Static Code Analysis  

E-Print Network [OSTI]

The use of team for teaching programming can be effective in the classroom because it helps students to generate and acquire new knowledge in less time, but these groups to be formed without taking into account some respects, may cause an adverse effect on the teaching-learning process. This paper proposes a tool for the formation of team based on the semantics of source code (SOFORG). This semantics is based on metrics extracted from the preferences, styles and good programming practices. All this is achieved through a static analysis of code that each student develops. In this way, you will have a record of students with the information extracted; it evaluates the best formation of teams in a given course. The team's formations are based on programming styles, skills, pair programming or with leader.

Arosemena-Trejos, Davis; Clunie, Clifton

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Development of one-dimensional computational fluid dynamics code 'GFLOW' for groundwater flow and contaminant transport analysis  

SciTech Connect (OSTI)

Prediction of groundwater movement and contaminant transport in soil is an important problem in many branches of science and engineering. This includes groundwater hydrology, environmental engineering, soil science, agricultural engineering and also nuclear engineering. Specifically, in nuclear engineering it is applicable in the design of spent fuel storage pools and waste management sites in the nuclear power plants. Ground water modeling involves the simulation of flow and contaminant transport by groundwater flow. In the context of contaminated soil and groundwater system, numerical simulations are typically used to demonstrate compliance with regulatory standard. A one-dimensional Computational Fluid Dynamics code GFLOW had been developed based on the Finite Difference Method for simulating groundwater flow and contaminant transport through saturated and unsaturated soil. The code is validated with the analytical model and the benchmarking cases available in the literature. (authors)

Rahatgaonkar, P. S.; Datta, D.; Malhotra, P. K.; Ghadge, S. G. [Nuclear Power Corporation of India Ltd., R-2, Ent. Block, Nabhikiya Urja Bhavan, Anushakti Nagar, Mumbai - 400 094 (India)

2012-07-01T23:59:59.000Z

242

Kelvin-Helmholtz instability for flow in porous media under the influence of oblique magnetic fields: A viscous potential flow analysis  

SciTech Connect (OSTI)

In this paper, the Kelvin-Helmholtz instability of viscous incompressible magnetic fluid fully saturated porous media is achieved through the viscous potential theory. The flow is considered to be through semi-permeable boundaries above and below the fluids through which the fluid may either be blown in or sucked out, in a direction normal to the main streaming direction of the fluid flow. An oblique magnetic field, mass, heat transfer, and surface tension are present across the interface. Through the linear stability analysis, a general dispersion relation is derived and the natural curves are plotted. Therefore, the linear stability condition is discussed in some depth. In view of the multiple time scale technique, the GinzburgĖLandau equation, which describes the behavior of the system in the nonlinear approach, is obtained. The effects of the orientation of the magnetic fields on the stability configuration in linear, as well as nonlinear approaches, are discussed. It is found that the Darcy's coefficient for the porous layers plays a stabilizing role. The injection of the fluids at both boundaries has a stabilizing effect, in contrast with the suction at both boundaries.

Moatimid, Galal M. [Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk, P.O. Box 741 (Saudi Arabia)] [Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk, P.O. Box 741 (Saudi Arabia); Obied Allah, M. H. [Department of Mathematics, Faculty of Science, Assiut University, Assiut (Egypt)] [Department of Mathematics, Faculty of Science, Assiut University, Assiut (Egypt); Hassan, Mohamed A. [Department of Mathematics, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)] [Department of Mathematics, Faculty of Education, Ain Shams University, Roxy, Cairo (Egypt)

2013-10-15T23:59:59.000Z

243

ATLAS I: A GeneralPurpose, SingleChip ATM Switch with CreditBased Flow Control  

E-Print Network [OSTI]

ATLAS I: A General­Purpose, Single­Chip ATM Switch with Credit­Based Flow Control Manolis Katevenis@ics.forth.gr Tel.: +30 (81) 391664 Fax: +30 (81) 391661 URL: file://ftp.ics.forth.gr/tech­reports/1996/1996.HOTI.ATLAS_I_ATMswitchChip.ps.gz ABSTRACT: ATLAS I is a 16x16 single­chip ATM switch, featuring 20 Gbit/s aggregate I/O throughput, sub

Katevenis, Manolis G.H.

244

New aspects in the analysis of loss-of-flow transients for homogeneous and heterogeneous LMFBR cores  

SciTech Connect (OSTI)

This paper presents the results of analyses of unprotected loss-of-flow (LOF) transients which have been performed to date using the new SAS4A code system. Accident histories for homogeneous and heterogeneous demo-sized cores (300 MWe) are compared and emphasis is placed on phenomena occurring after the initiation of fuel motion as described by LEVITATE. LEVITATE is the SAS4A model for the analysis of fuel and cladding dynamics under loss-of-flow (LOF) conditions and is believed to be the most-sophisticated computational tool currently available for fuel-motion analysis. The results of this analysis indicate that the initiation phase of an unprotected loss-of-flow accident has a considerably lower energetics potential in a heterogeneous core than in a homogeneous core. The difference is larger than previously indicated by SAS3D. Better phenomenological models implemented in SAS4A provide increased confidence in this aspect of safety evaluation of LMFBR cores.

Tentner, A.M.; Wider, H.U.

1982-01-01T23:59:59.000Z

245

A graph-based system for network-vulnerability analysis  

SciTech Connect (OSTI)

This paper presents a graph-based approach to network vulnerability analysis. The method is flexible, allowing analysis of attacks from both outside and inside the network. It can analyze risks to a specific network asset, or examine the universe of possible consequences following a successful attack. The graph-based tool can identify the set of attack paths that have a high probability of success (or a low effort cost) for the attacker. The system could be used to test the effectiveness of making configuration changes, implementing an intrusion detection system, etc. The analysis system requires as input a database of common attacks, broken into atomic steps, specific network configuration and topology information, and an attacker profile. The attack information is matched with the network configuration information and an attacker profile to create a superset attack graph. Nodes identify a stage of attack, for example the class of machines the attacker has accessed and the user privilege level he or she has compromised. The arcs in the attack graph represent attacks or stages of attacks. By assigning probabilities of success on the arcs or costs representing level-of-effort for the attacker, various graph algorithms such as shortest-path algorithms can identify the attack paths with the highest probability of success.

Swiler, L.P.; Phillips, C.

1998-06-01T23:59:59.000Z

246

Sensitivity analysis of aquifer parameter estimations based on the Laplace equation with linearized boundary conditions  

E-Print Network [OSTI]

boundary conditions Jozsef Szilagyi Conservation and Survey Division, University of Nebraska analysis Citation: Szilagyi, J., Sensitivity analysis of aquifer parameter estimations based on the Laplace

Szilagyi, Jozsef

247

Analysis of multiphase fluid flows via high speed and synthetic aperture three dimensional imaging  

E-Print Network [OSTI]

Spray flows are a difficult problem within the realm of fluid mechanics because of the complicated interfacial physics involved. Complete models of sprays having even the simplest geometries continue to elude researchers ...

Scharfman, Barry Ethan

2012-01-01T23:59:59.000Z

248

Wavelet analysis study of microbubble drag reduction in a boundary channel flow  

E-Print Network [OSTI]

Particle Image Velocimetry (PIV) and pressure measurement techniques were performed to investigate the drag reduction due to microbubble injection in the boundary layer of a fully developed turbulent channel flow. Two-dimensional full-field velocity...

Zhen, Ling

2006-04-12T23:59:59.000Z

249

Rheo-PIV Analysis of the Yielding and Flow of Model Waxy Crude Oils  

E-Print Network [OSTI]

Waxes are a commonly encountered precipitate that can result in the gelation of crude oils and cessation of flow in pipelines. In this work, we develop a model waxĖoil system that exhibits rheological behavior similar to ...

Dimitriou, Christopher J.

250

NMR imaging and hydrodynamic analysis of neutrally buoyant non-Newtonian slurry flows  

SciTech Connect (OSTI)

The flow of solids loaded suspension in cylindrical pipes has been the object of intense experimental and theoretical investigations in recent years. These types of flows are of great interest in chemical engineering because of their important use in many industrial manufacturing processes. Such flows are for example encountered in the manufacture of solid-rocket propellants, advanced ceramics, reinforced polymer composites, in heterogenous catalytic reactors, and in the pipeline transport of liquid-solids suspensions. In most cases, the suspension microstructure and the degree of solids dispersion greatly affect the final performance of the manufactured product. For example, solid propellant pellets need to be extremely-well dispersed in gel matrices for use as rocket engine solid fuels. The homogeneity of pellet dispersion is critical to allow good uniformity of the burn rate, which in turn affects the final mechanical performance of the engine. Today`s manufacturing of such fuels uses continuous flow processes rather than batch processes. Unfortunately, the hydrodynamics of such flow processes is poorly understood and is difficult to assess because it requires the simultaneous measurements of liquid/solids phase velocities and volume fractions. Due to the recent development in pulsed Fourier Transform NMR imaging, NMR imaging is now becoming a powerful technique for the non intrusive investigation of multi-phase flows. This paper reports and exposes a state-of-the-art experimental and theoretical methodology that can be used to study such flows. The hydrodynamic model developed for this study is a two-phase flow shear thinning model with standard constitutive fluid/solids interphase drag and solids compaction stresses. this model shows good agreement with experimental data and the limitations of this model are discussed.

Bouillard, J.X. [Argonne National Lab., IL (United States); Sinton, S.W. [Lockheed Missiles and Space Co., Palo Alto, CA (United States). Research Lab.

1995-02-01T23:59:59.000Z

251

Modeling, Analysis and Simulation of Multiscale Preferential Flow - 8/05-8/10 - Final Report  

SciTech Connect (OSTI)

The research agenda of this project are: (1) Modeling of preferential transport from mesoscale to macroscale; (2) Modeling of fast flow in narrow fractures in porous media; (3) Pseudo-parabolic Models of Dynamic Capillary Pressure; (4) Adaptive computational upscaling of flow with inertia from porescale to mesoscale; (5) Adaptive modeling of nonlinear coupled systems; and (6) Adaptive modeling and a-posteriori estimators for coupled systems with heterogeneous data.

Ralph Showalter; Malgorzata Peszynska

2012-07-03T23:59:59.000Z

252

Loading and Regeneration Analysis of a Diesel Particulate Filter with a Radio Frequency-Based Sensor  

SciTech Connect (OSTI)

Accurate knowledge of diesel particulate filter (DPF) loading is critical for robust and efficient operation of the combined engine-exhaust aftertreatment system. Furthermore, upcoming on-board diagnostics regulations require on-board technologies to evaluate the status of the DPF. This work describes the application of radio frequency (RF) based sensing techniques to accurately measure DPF soot levels and the spatial distribution of the accumulated material. A 1.9L GM turbo diesel engine and a DPF with an RF-sensor were studied. Direct comparisons between the RF measurement and conventional pressure-based methods were made. Further analysis of the particulate matter loading rates was obtained with a mass-based soot emission measurement instrument (TEOM). Comparison with pressure drop measurements show the RF technique is unaffected by exhaust flow variations and exhibits a high degree of sensitivity to DPF soot loading and good dynamic response. Additional computational and experimental work further illustrates the spatial resolution of the RF measurements. Based on the experimental results, the RF technique shows significant promise for improving DPF control enabling optimization of the combined engine-aftertreatment system for improved fuel economy and extended DPF service life.

Sappok, Alex [Filter Sensing Technologies] [Filter Sensing Technologies; Prikhodko, Vitaly Y [ORNL] [ORNL; Parks, II, James E [ORNL

2010-01-01T23:59:59.000Z

253

Lossless droplet transfer of droplet-based microfluidic analysis  

DOE Patents [OSTI]

A transfer structure for droplet-based microfluidic analysis is characterized by a first conduit containing a first stream having at least one immiscible droplet of aqueous material and a second conduit containing a second stream comprising an aqueous fluid. The interface between the first conduit and the second conduit can define a plurality of apertures, wherein the apertures are sized to prevent exchange of the first and second streams between conduits while allowing lossless transfer of droplets from the first conduit to the second conduit through contact between the first and second streams.

Kelly, Ryan T (West Richland, WA); Tang, Keqi (Richland, WA); Page, Jason S (Kennewick, WA); Smith, Richard D (Richland, WA)

2011-11-22T23:59:59.000Z

254

Shear-slip analysis in multiphase fluid-flow reservoir engineering ap plications using TOUGH-FLAC  

E-Print Network [OSTI]

IN MULTIPHASE FLUID-FLOW RESERVOIR ENGINEERING APPLICATIONSin multiphase fluid-flow reservoir-engineering applications.in multiphase fluid-flow reservoir engineering applications.

Rutqvist, Jonny; Birkholzer, Jens; Cappa, Frederic; Oldenburg, Curt; Tsang, Chin-Fu

2008-01-01T23:59:59.000Z

255

Design and performance evaluation of an OpenFlow-based control plane for software-  

E-Print Network [OSTI]

. Mu√Īoz, "Control plane techniques for elastic optical networks: GMPLS/PCE vs OpenFlow," in IEEE Global. Moreolo, R. Martinez, L. Liu, T. Tsuritani, and I. Morita, "Experimental assessment of a combined PCE, R. Mart√≠nez, L. Liu, T. Tsuritani, and I. Morita, "GMPLS/PCE control of flexi-grid DWDM optical

Yoo, S. J. Ben

256

Biogeography-Based Optimization and the Solution of the Power Flow Problem  

E-Print Network [OSTI]

for power utilities is the optimal power flow (OPF) problem which was introduced in 1962 by the French engineer Jules Carpentier [7]. A power utility may own power generating plants fueled by coal, natural gas absorbed by the loads plus the power losses that occur in the transmission system. Second, both the active

Simon, Dan

257

Modified Centrality Measure Based on Bidirectional Power Flow for Smart and Bulk Power  

E-Print Network [OSTI]

the directionality of power flow of future smart grid. Appli- cability of the proposed method has been evaluated smart and new technologies by utilities [1]. The scope of smart grid includes various generation options systems is the most lucrative part of smart grid from the point of view of regulating energy usage. Excess

Pota, Himanshu Roy

258

Numerical analysis of hypersonic continuum and rarefied gas flows near blunt probes is presented under conditions of intensive gas blowing from the surface.  

E-Print Network [OSTI]

1 Abstract Numerical analysis of hypersonic continuum and rarefied gas flows near blunt probes injection, hydrogen combustion, hypersonic flow, exponential box-scheme, direct-simulation Monte-Carlo method. 1 Introduction Numerical and experimental studies [1, 2] of aerothermodynamics of hypersonic

Riabov, Vladimir V.

259

A graph-based network-vulnerability analysis system  

SciTech Connect (OSTI)

This paper presents a graph based approach to network vulnerability analysis. The method is flexible, allowing analysis of attacks from both outside and inside the network. It can analyze risks to a specific network asset, or examine the universe of possible consequences following a successful attack. The analysis system requires as input a database of common attacks, broken into atomic steps, specific network configuration and topology information, and an attacker profile. The attack information is matched with the network configuration information and an attacker profile to create a superset attack graph. Nodes identify a stage of attack, for example the class of machines the attacker has accessed and the user privilege level he or she has compromised. The arcs in the attack graph represent attacks or stages of attacks. By assigning probabilities of success on the arcs or costs representing level of effort for the attacker, various graph algorithms such as shortest path algorithms can identify the attack paths with the highest probability of success.

Swiler, L.P.; Phillips, C.; Gaylor, T.

1998-05-03T23:59:59.000Z

260

A graph-based network-vulnerability analysis system  

SciTech Connect (OSTI)

This report presents a graph-based approach to network vulnerability analysis. The method is flexible, allowing analysis of attacks from both outside and inside the network. It can analyze risks to a specific network asset, or examine the universe of possible consequences following a successful attack. The analysis system requires as input a database of common attacks, broken into atomic steps, specific network configuration and topology information, and an attacker profile. The attack information is matched with the network configuration information and an attacker profile to create a superset attack graph. Nodes identify a stage of attack, for example the class of machines the attacker has accessed and the user privilege level he or she has compromised. The arcs in the attack graph represent attacks or stages of attacks. By assigning probabilities of success on the arcs or costs representing level-of-effort for the attacker, various graph algorithms such as shortest-path algorithms can identify the attack paths with the highest probability of success.

Swiler, L.P.; Phillips, C. [Sandia National Labs., Albuquerque, NM (United States); Gaylor, T. [3M, Austin, TX (United States). Visual Systems Div.

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

MEMBRANELESS FUEL CELL BASED ON LAMINAR FLOW Eric R. Choban, Piotr Waszczuk, Larry J. Markoski, Andrzej Wieckowski, and Paul J.A. Kenis*  

E-Print Network [OSTI]

MEMBRANELESS FUEL CELL BASED ON LAMINAR FLOW Eric R. Choban, Piotr Waszczuk, Larry J. Markoski in this area focus on downscaling of existing fuel cell technology such as the well-known proton exchange membrane (PEM) fuel cells. Here we study a novel concept for fuel cells: the use of laminar flow instead

Kenis, Paul J. A.

262

Numerical analysis of the coherent radiation emission by two stacked Josephson flux-flow oscillators  

SciTech Connect (OSTI)

The numerical investigation of the radiation emission by a system of two magnetically coupled, long Josephson junctions is reported. Time-dependent synchronized voltage response in the flux-flow regime is analyzed for the case of in-phase and out-of-phase oscillations in the junctions. Simulations show that Josephson junctions operating in the in-phase flux-flow mode may generate rf radiation power by a factor of more than 4 larger than that of a single Josephson junction. The radiation in the out-of-phase flux-flow mode is characterized by nearly completely suppressed amplitudes of odd harmonics and considerably damped even harmonics as compared to that of a single barrier junction. The dependence of the radiation power on the parameter spread between the junctions is investigated. The advantages of using stacked Josephson junctions as oscillators for the sub-mm wave band are discussed. {copyright} {ital 1996 American Institute of Physics.}

Wallraff, A.; Goldobin, E.; Ustinov, A.V. [Institute of Thin Film and Ion Technology, Research Center Juelich (KFA), D-52425 (Germany)] [Institute of Thin Film and Ion Technology, Research Center Juelich (KFA), D-52425 (Germany)

1996-12-01T23:59:59.000Z

263

Draft of Preliminary Syllabus Applying Geospatial Analysis-Project Based Learning  

E-Print Network [OSTI]

Draft of Preliminary Syllabus Applying Geospatial Analysis- Project Based Learning Listed as, and analysis (2) formulate and evaluate research questions relating to geospatial approaches (3) learn geospatial techniques (4) learn data management, data conversion, and data analysis (5) apply geospatial

Fabrikant, Sara Irina

264

A Comprehensive Statistically-Based Method to Interpret Real-Time Flowing Measurements  

SciTech Connect (OSTI)

With the recent development of temperature measurement systems, continuous temperature profiles can be obtained with high precision. Small temperature changes can be detected by modern temperature measuring instruments such as fiber optic distributed temperature sensor (DTS) in intelligent completions and will potentially aid the diagnosis of downhole flow conditions. In vertical wells, since elevational geothermal changes make the wellbore temperature sensitive to the amount and the type of fluids produced, temperature logs can be used successfully to diagnose the downhole flow conditions. However, geothermal temperature changes along the wellbore being small for horizontal wells, interpretations of a temperature log become difficult. The primary temperature differences for each phase (oil, water, and gas) are caused by frictional effects. Therefore, in developing a thermal model for horizontal wellbore, subtle temperature changes must be accounted for. In this project, we have rigorously derived governing equations for a producing horizontal wellbore and developed a prediction model of the temperature and pressure by coupling the wellbore and reservoir equations. Also, we applied Ramey's model (1962) to the build section and used an energy balance to infer the temperature profile at the junction. The multilateral wellbore temperature model was applied to a wide range of cases at varying fluid thermal properties, absolute values of temperature and pressure, geothermal gradients, flow rates from each lateral, and the trajectories of each build section. With the prediction models developed, we present inversion studies of synthetic and field examples. These results are essential to identify water or gas entry, to guide flow control devices in intelligent completions, and to decide if reservoir stimulation is needed in particular horizontal sections. This study will complete and validate these inversion studies.

Keita Yoshioka; Pinan Dawkrajai; Analis A. Romero; Ding Zhu; A. D. Hill; Larry W. Lake

2007-01-15T23:59:59.000Z

265

Performance Analysis of an Annular Diffuser Under the Influence of a Gas Turbine Stage Exit Flow  

E-Print Network [OSTI]

stream entering the gap from the pressure side of the blade separates at the tip, due to the sharp corner, and contracts into a jet. Wear and tear of the sharp corners of the blade is inevitable with time, and as the tip corners get eroded the flow... displacements. Plus, over the engine life span the gap increases due to the metal wear and tear. One practiced method of mitigating the over the tip leakage flow is achieved by introducing a shroud to the rotor blade. In Figure 2.13, two high pressure...

Blanco, Rafael Rodriguez

2013-12-31T23:59:59.000Z

266

Perturbative analysis of sheared flow Kelvin-Helmholtz instability in a weakly relativistic magnetized electron fluid  

SciTech Connect (OSTI)

In the interaction of intense lasers with matter/plasma, energetic electrons having relativistic energies get created. These energetic electrons can often have sheared flow profiles as they propagate through the plasma medium. In an earlier study [Phys. Plasmas 17, 022101 (2010)], it was shown that a relativistic sheared electron flow modifies the growth rate and threshold condition of the conventional Kelvin-Helmholtz instability. A perturbative analytic treatment for the case of weakly relativistic regime has been provided here. It provides good agreement with the numerical results obtained earlier.

Sundar, Sita; Das, Amita; Kaw, Predhiman [Institute for Plasma Research, Bhat, Gandhinagar-382428 (India)

2012-05-15T23:59:59.000Z

267

Numerical analysis of laminar fluid flow and heat transfer in a parallel plate channel with normally in-line positioned plates  

E-Print Network [OSTI]

NUMERICAL ANALYSIS OF LAMINAR FLUID FLOW AND HEAT TRANSFER IN A PARALLEL PLATE CHANNEL WITH NORMALLY IN-LINE POSITIONED PLATES A Thesis by JOHN GRADY iVICMATH Submitted to the Office of Graduate Studies of Texas AkM University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1991 Major Subject: Mechanical Engineering NUMERICAL ANALYSIS OF LAMINAR FLUID FLOW AND HEAT TRANSFER IN A PARALLEL PLATE CHANNEI WITH NORMALLY IN-LINE POSITIONED PLATES A...

McMath, John Grady

2012-06-07T23:59:59.000Z

268

The Fourier-Like and Hartley-Like Wavelet Analysis Based on Hilbert Transforms  

E-Print Network [OSTI]

In continuous-time wavelet analysis, most wavelet present some kind of symmetry. Based on the Fourier and Hartley transform kernels, a new wavelet multiresolution analysis is proposed. This approach is based on a pair of orthogonal wavelet functions and is named as the Fourier-Like and Hartley-Like wavelet analysis. A Hilbert transform analysis on the wavelet theory is also included.

Soares, L R; Cintra, R J

2015-01-01T23:59:59.000Z

269

Results from One- and Two- Phase Fluid Flow Calculations within the Preliminary Safety Analysis of the Gorleben Site - 13310  

SciTech Connect (OSTI)

Rock salt is one of the possible host rock formations for the disposal of high-level radioactive wastes in Germany. The Preliminary Safety Analysis of the Gorleben Site (Vorlaeufige Sicherheitsanalyse Gorleben, VSG) evaluates the long-term safety of a hypothetical repository in the salt dome of Gorleben, Germany. A mature repository concept and detailed knowledge of the site allowed a detailed process analysis within the project by numerical modeling of single-phase and two-phase flow. The possibility of liquid transport from the shafts to the emplacement drifts is one objective of the present study. Also, the implications of brine inflow on radionuclide transport and gas generation are investigated. Pressure build-up due to rock convergence and gas generation, release of volatile radionuclides from the waste and pressure-driven contaminant transport were considered, too. The study confirms that the compaction behavior of salt grit backfill is one of the most relevant factors for the hydrodynamic evolution of the repository and the transport of contaminants. Due to the interaction between compaction, saturation and pore pressure, complex flow patterns evolve. Emplacement drifts serve as gas sinks or sources at different times. In most calculation cases, the backfill reaches its final porosity after a few hundred years. The repository is then sealed and radionuclides can only be transported by diffusion in the liquid phase. Estimates for the final porosity of compacted backfill range between 0 % and 2 %. The exact properties of the backfill regarding single- and two-phase flow are not well known for this porosity range. The study highlights that this uncertainty has a profound impact on flow and transport processes over long time-scales. Therefore, more research is needed to characterize the properties of crushed salt grit at low porosities or to reduce the adverse effects of possible higher porosities by repository optimization. (authors)

Kock, Ingo; Larue, Juergen; Fischer, Heidi; Frieling, Gerd; Navarro, Martin; Seher, Holger [Department of Final Disposal, GRS mbH, Schwertnergasse 1, 50667 Cologne (Germany)] [Department of Final Disposal, GRS mbH, Schwertnergasse 1, 50667 Cologne (Germany)

2013-07-01T23:59:59.000Z

270

Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units with  

E-Print Network [OSTI]

of virtual impedance parameters and (ii) higher accuracy in reactive power flow calculation. The improved With larger portion of growing electricity demand which is being fed through distributed generation (DG, in order to decouple real and reactive power, to increase the stability margin and also to improve

Chaudhary, Sanjay

271

Turbulent Flow Analysis and Coherent Structure Identification in Experimental Models with Complex Geometries  

E-Print Network [OSTI]

through the core of an annular pebble bed VHTR. The complex geometry of the core and the highly turbulent nature of the coolant flow passing through the gaps of fuel pebbles make this case quite challenging. In this experiment, a high frequency Hot Wire...

Amini, Noushin

2012-02-14T23:59:59.000Z

272

A comparison of an analytical and two electric analogy methods of hydraulic flow analysis  

E-Print Network [OSTI]

~ +0. 00085 ~ *0. 0006 ~ ~0. 0005 OS0. 0004 ~ +0 ~ 00015 PIPE DIAMETER, D& IN INCHES FIGVRE 2 ~ RATIO ~ / D FOR VARIOOS TRIPES OF PIPES Employing the continuity equation for steady incompressible flow, the following relationship is found, Q=AV...

Hoffman, Joe Douglas

1959-01-01T23:59:59.000Z

273

A Novel Power Flow Method for Long Term Frequency Stability Analysis  

E-Print Network [OSTI]

This thesis presents a novel approach for a power system to find a practical power flow solution when all the generators in the system have hit their real power output limits, such as some generator units shutting down or load outages. The approach...

Yan, Wenjin

2013-05-06T23:59:59.000Z

274

Stochastic analysis of transient flow to a well in a heterogeneous aquifer  

E-Print Network [OSTI]

of Arizona) Mentors: Shlomo P. Neuman (U of Arizona) Daniel Tartakovsky (LANL-T7) Introduction of potable water on Earth. The term groundwater is usually used to describe water that is beneath the water groundwater flow are generally uncertain in their exact nature, magnitude, and spatio- temporal distribution

Kurien, Susan

275

Fluid flow near reservoir lakes inferred from the spatial and temporal analysis of the electric potential  

E-Print Network [OSTI]

, 2002. 1. Introduction [2] Detecting subsurface groundwater circulation using geophysical methods to result from the electrokinetic coupling associated with a vertical groundwater flow connecting a constant pore pressure source to the bottom of the lakes. Numerical modeling indicates that the spatial

Adolphs, Ralph

276

A stochastic analysis of transient two-phase flow in heterogeneous porous media  

E-Print Network [OSTI]

the finite element heat and mass (FEHM) transfer code, whose results are considered ``true'' solutions equation (KLME) approach is implemented to model stochastic transient water-NAPL two-phase flow model and Parker and Lenhard models are adopted. The log-transformed intrinsic permeability, soil pore

Lu, Zhiming

277

Survey of sampling-based methods for uncertainty and sensitivity analysis.  

SciTech Connect (OSTI)

Sampling-based methods for uncertainty and sensitivity analysis are reviewed. The following topics are considered: (1) Definition of probability distributions to characterize epistemic uncertainty in analysis inputs, (2) Generation of samples from uncertain analysis inputs, (3) Propagation of sampled inputs through an analysis, (4) Presentation of uncertainty analysis results, and (5) Determination of sensitivity analysis results. Special attention is given to the determination of sensitivity analysis results, with brief descriptions and illustrations given for the following procedures/techniques: examination of scatterplots, correlation analysis, regression analysis, partial correlation analysis, rank transformations, statistical tests for patterns based on gridding, entropy tests for patterns based on gridding, nonparametric regression analysis, squared rank differences/rank correlation coefficient test, two dimensional Kolmogorov-Smirnov test, tests for patterns based on distance measures, top down coefficient of concordance, and variance decomposition.

Johnson, Jay Dean; Helton, Jon Craig; Sallaberry, Cedric J. PhD. (.; .); Storlie, Curt B. (Colorado State University, Fort Collins, CO)

2006-06-01T23:59:59.000Z

278

MSET modeling of Crystal River-3 venturi flow meters.  

SciTech Connect (OSTI)

The analysis of archived Crystal River-3 feedwater flow data reveals a slow and steady degradation of the flow meter measurements during the 1992/1993 operating cycle. MSET can reliably estimate the true flow rate and quantify the degree of departure between the indicated signal and the true flow rate with high accuracy. The MSET computed flow rate could, in principle, be used to provide an improved estimate of the reactor power and hence avoid the revenue loss associated with derating the reactor based on a faulty feedwater flow rate indication.

Bockhorst, F. K.; Gross, K. C.; Herzog, J. P.; Wegerich, S. W.

1998-01-05T23:59:59.000Z

279

A COMPREHENSIVE STATISTICALLY-BASED METHOD TO INTERPRET REAL-TIME FLOWING MEASUREMENTS  

SciTech Connect (OSTI)

In this project, we are developing new methods for interpreting measurements in complex wells (horizontal, multilateral and multi-branching wells) to determine the profiles of oil, gas, and water entry. These methods are needed to take full advantage of ''smart'' well instrumentation, a technology that is rapidly evolving to provide the ability to continuously and permanently monitor downhole temperature, pressure, volumetric flow rate, and perhaps other fluid flow properties at many locations along a wellbore; and hence, to control and optimize well performance. In this first year, we have made considerable progress in the development of the forward model of temperature and pressure behavior in complex wells. In this period, we have progressed on three major parts of the forward problem of predicting the temperature and pressure behavior in complex wells. These three parts are the temperature and pressure behaviors in the reservoir near the wellbore, in the wellbore or laterals in the producing intervals, and in the build sections connecting the laterals, respectively. Many models exist to predict pressure behavior in reservoirs and wells, but these are almost always isothermal models. To predict temperature behavior we derived general mass, momentum, and energy balance equations for these parts of the complex well system. Analytical solutions for the reservoir and wellbore parts for certain special conditions show the magnitude of thermal effects that could occur. Our preliminary sensitivity analyses show that thermal effects caused by near-wellbore reservoir flow can cause temperature changes that are measurable with smart well technology. This is encouraging for the further development of the inverse model.

Pinan Dawkrajai; Analis A. Romero; Keita Yoshioka; Ding Zhu; A.D. Hill; Larry W. Lake

2004-10-01T23:59:59.000Z

280

Thermal-fluid and electrochemical modeling and performance study of a planar solid oxide electrolysis cell : analysis on SOEC resistances, size, and inlet flow conditions.  

SciTech Connect (OSTI)

Argonne National Laboratory and Idaho National Laboratory researchers are analyzing the electrochemical and thermal-fluid behavior of solid oxide electrolysis cells (SOECs) for high temperature steam electrolysis using computational fluid dynamics (CFD) techniques. The major challenges facing commercialization of steam electrolysis technology are related to efficiency, cost, and durability of the SOECs. The goal of this effort is to guide the design and optimization of performance for high temperature electrolysis (HTE) systems. An SOEC module developed by FLUENT Inc. as part of their general CFD code was used for the SOEC analysis by INL. ANL has developed an independent SOEC model that combines the governing electrochemical mechanisms based on first principals to the heat transfer and fluid dynamics in the operation of SOECs. The ANL model was embedded into the commercial STAR-CD CFD software, and is being used for the analysis of SOECs by ANL. The FY06 analysis performed by ANL and reported here covered the influence of electrochemical properties, SOEC component resistances and their contributing factors, SOEC size and inlet flow conditions, and SOEC flow configurations on the efficiency and expected durability of these systems. Some of the important findings from the ANL analysis are: (1) Increasing the inlet mass flux while going to larger cells can be a compromise to overcome increasing thermal and current density gradients while increasing the cell size. This approach could be beneficial for the economics of the SOECs; (2) The presence of excess hydrogen at the SOEC inlet to avoid Ni degradation can result in a sizeable decrease in the process efficiency; (3) A parallel-flow geometry for SOEC operation (if such a thing be achieved without sealing problems) yields smaller temperature gradients and current density gradients across the cell, which is favorable for the durability of the cells; (4) Contact resistances can significantly influence the total cell resistance and cell temperatures over a large range of operating potentials. Thus it is important to identify and avoid SOEC stack conditions leading to such high resistances due to poor contacts.

Yildiz, B.; Smith, J.; Sofu, T.; Nuclear Engineering Division

2008-06-25T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

E-Print Network 3.0 - analysis web-based interface Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

web-based interface Search Powered by Explorit Topic List Advanced Search Sample search results for: analysis web-based interface Page: << < 1 2 3 4 5 > >> 1 Web-based Support...

282

Oscillatory motion based measurement method and sensor for measuring wall shear stress due to fluid flow  

DOE Patents [OSTI]

A shear stress sensor for measuring fluid wall shear stress on a test surface is provided. The wall shear stress sensor is comprised of an active sensing surface and a sensor body. An elastic mechanism mounted between the active sensing surface and the sensor body allows movement between the active sensing surface and the sensor body. A driving mechanism forces the shear stress sensor to oscillate. A measuring mechanism measures displacement of the active sensing surface relative to the sensor body. The sensor may be operated under periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor measurably changes the amplitude or phase of the motion of the active sensing surface, or changes the force and power required from a control system in order to maintain constant motion. The device may be operated under non-periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor change the transient motion of the active sensor surface or change the force and power required from a control system to maintain a specified transient motion of the active sensor surface.

Armstrong, William D. (Laramie, WY); Naughton, Jonathan (Laramie, WY); Lindberg, William R. (Laramie, WY)

2008-09-02T23:59:59.000Z

283

Analysis of laser remote fusion cutting based on a mathematical model  

SciTech Connect (OSTI)

Laser remote fusion cutting is analyzed by the aid of a semi-analytical mathematical model of the processing front. By local calculation of the energy balance between the absorbed laser beam and the heat losses, the three-dimensional vaporization front can be calculated. Based on an empirical model for the melt flow field, from a mass balance, the melt film and the melting front can be derived, however only in a simplified manner and for quasi-steady state conditions. Front waviness and multiple reflections are not modelled. The model enables to compare the similarities, differences, and limits between laser remote fusion cutting, laser remote ablation cutting, and even laser keyhole welding. In contrast to the upper part of the vaporization front, the major part only slightly varies with respect to heat flux, laser power density, absorptivity, and angle of front inclination. Statistical analysis shows that for high cutting speed, the domains of high laser power density contribute much more to the formation of the front than for low speed. The semi-analytical modelling approach offers flexibility to simplify part of the process physics while, for example, sophisticated modelling of the complex focused fibre-guided laser beam is taken into account to enable deeper analysis of the beam interaction. Mechanisms like recast layer generation, absorptivity at a wavy processing front, and melt film formation are studied too.

Matti, R. S. [Department of Engineering Sciences and Mathematics, LuleŚ University of Technology, S-971 87 LuleŚ (Sweden); Department of Mechanical Engineering, College of Engineering, University of Mosul, Mosul (Iraq); Ilar, T.; Kaplan, A. F. H. [Department of Engineering Sciences and Mathematics, LuleŚ University of Technology, S-971 87 LuleŚ (Sweden)

2013-12-21T23:59:59.000Z

284

Analysis of Granular Flow in a Pebble-Bed Nuclear Reactor  

E-Print Network [OSTI]

Pebble-bed nuclear reactor technology, which is currently being revived around the world, raises fundamental questions about dense granular flow in silos. A typical reactor core is composed of graphite fuel pebbles, which drain very slowly in a continuous refueling process. Pebble flow is poorly understood and not easily accessible to experiments, and yet it has a major impact on reactor physics. To address this problem, we perform full-scale, discrete-element simulations in realistic geometries, with up to 440,000 frictional, viscoelastic 6cm-diameter spheres draining in a cylindrical vessel of diameter 3.5m and height 10m with bottom funnels angled at 30 degrees or 60 degrees. We also simulate a bidisperse core with a dynamic central column of smaller graphite moderator pebbles and show that little mixing occurs down to a 1:2 diameter ratio. We analyze the mean velocity, diffusion and mixing, local ordering and porosity (from Voronoi volumes), the residence-time distribution, and the effects of wall friction and discuss implications for reactor design and the basic physics of granular flow.

Chris H. Rycroft; Gary S. Grest; James W. Landry; Martin Z. Bazant

2006-02-16T23:59:59.000Z

285

Estimation of fracture flow parameters through numerical analysis of hydromechanical pressure pulses  

SciTech Connect (OSTI)

The flow parameters of a natural fracture were estimated by modeling in situ pressure pulses. The pulses were generated in two horizontal boreholes spaced 1 m apart vertically and intersecting a near-vertical highly permeable fracture located within a shallow fractured carbonate reservoir. Fracture hydromechanical response was monitored using specialized fiber-optic borehole equipment that could simultaneously measure fluid pressure and fracture displacements. Measurements indicated a significant time lag between the pressure peak at the injection point and the one at the second measuring point, located 1 m away. The pressure pulse dilated and contracted the fracture. Field data were analyzed through hydraulic and coupled hydromechanical simulations using different governing flow laws. In matching the time lag between the pressure peaks at the two measuring points, our hydraulic models indicated that (1) flow was channeled in the fracture, (2) the hydraulic conductivity tensor was highly anisotropic, and (3) the radius of pulse influence was asymmetric, in that the pulse travelled faster vertically than horizontally. Moreover, our parametric study demonstrated that the fluid pressure diffusion through the fracture was quite sensitive to the spacing and orientation of channels, hydraulic aperture, storativity and hydraulic conductivity. Comparison between hydraulic and hydromechanical models showed that the deformation significantly affected fracture permeability and storativity, and consequently, the fluid pressure propagation, suggesting that the simultaneous measurements of pressure and mechanical displacement signals could substantially improve the interpretation of pulse tests during reservoir characterization.

Cappa, F.; Guglielmi, Y.; Rutqvist, J.; Tsang, C.-F.; Thoraval, A.

2008-03-16T23:59:59.000Z

286

Analysis of the flow imbalance on the profile shape during the extrusion of thin magnesium sheets  

SciTech Connect (OSTI)

The extrusion process facilitates the production of magnesium sheets featuring a very thin thickness as well as excellent surface properties by using a single process step only. However, the extrusion of the magnesium sheets applying not optimized process parameters, e.g. low billet temperature or/ and poorly deformable magnesium alloy, produce pronounced buckling and waving of the extruded sheets as well as a variation of accuracy in profile shape along the cross section. The present investigation focuses on the FEM-simulation of the extrusion of magnesium sheets in order to clarify the origin of the mentioned effects. The simulations identify the flow imbalance during extrusion as the main critical factor. Due to the flow imbalance after passing the die a large compression stress zone is formed causing the buckling and waving of the thin sheets. Furthermore, the simulations of the magnesium sheet extrusion reveal that the interaction of the material flow gradients along the width and along the thickness direction near the die orifice lead to the variation of the accuracy in profile shape.

Gall, Sven [Forschungszentrum Strangpressen, Technische Universitšt Berlin, Gustav-Meyer-Allee 25, Berlin, 13355, Germany, and Metallische Werkstoffe, Technische Universitšt Berlin, Ernst-Reuter-Platz 1, Berlin, 10587 (Germany); MŁller, SŲren [Forschungszentrum Strangpressen, Technische Universitšt Berlin, Gustav-Meyer-Allee 25, Berlin, 13355 (Germany); Reimers, Walter [Metallische Werkstoffe, Technische Universitšt Berlin, Ernst-Reuter-Platz 1, Berlin, 10587 (Germany)

2013-12-16T23:59:59.000Z

287

Full field automated flow analysis of a spray using digital pulsed laser velocimetry  

E-Print Network [OSTI]

. . The MV image double B. The MV image double C. . Target grid for the EP doubles. . . Target grid for the EP singles. The EP image double 11. The EP image single 11. The EP image double 12. Page 35 36 36 39 40 41 42 43 44 45 47 47 48 51.... The EP image single 13. . The EP image double 14, The EP image single 14. Target grid for the analysis of EP doubles. Target grid for the analysis of EP singles. Region of EP double 11 used for analysis. Region of EP single 11 used for analysis...

Delahunte, Katey Eileen

1991-01-01T23:59:59.000Z

288

Wind flow modeling for wind energy analysis of the Nellis Dunes area in Nevada.  

E-Print Network [OSTI]

??A wind energy analysis of the Nellis Dunes area in Nevada was conducted. A DEM file which contains the elevation data was used to generateÖ (more)

Rangegowda, Upendra

2010-01-01T23:59:59.000Z

289

Feature-based Analysis of Plasma-based Particle Acceleration Data  

SciTech Connect (OSTI)

Plasma-based particle accelerators can produce and sustain thousands of times stronger acceleration fields than conventional particle accelerators, providing a potential solution to the problem of the growing size and cost of conventional particle accelerators. To facilitate scientific knowledge discovery from the ever growing collections of accelerator simulation data generated by accelerator physicists to investigate next-generation plasma-based particle accelerator designs, we describe a novel approach for automatic detection and classification of particle beams and beam substructures due to temporal differences in the acceleration process, here called acceleration features. The automatic feature detection in combination with a novel visualization tool for fast, intuitive, query-based exploration of acceleration features enables an effective top-down data exploration process, starting from a high-level, feature-based view down to the level of individual particles. We describe the application of our analysis in practice to analyze simulations of single pulse and dual and triple colliding pulse accelerator designs, and to study the formation and evolution of particle beams, to compare substructures of a beam and to investigate transverse particle loss.

Ruebel, Oliver; Geddes, Cameron G.R.; Chen, Min; Cormier-Michel, Estelle; Bethel, E. Wes

2013-07-05T23:59:59.000Z

290

Update and assessment of geothermal economic models, geothermal fluid flow and heat distribution models, and geothermal data bases  

SciTech Connect (OSTI)

Numerical simulation models and data bases that were developed for DOE as part of a number of geothermal programs have been assessed with respect to their overall stage of development and usefulness. This report combines three separate studies that focus attention upon: (1) economic models related to geothermal energy; (2) physical geothermal system models pertaining to thermal energy and the fluid medium; and (3) geothermal energy data bases. Computerized numerical models pertaining to the economics of extracting and utilizing geothermal energy have been summarized and catalogued with respect to their availability, utility and function. The 19 models that are discussed in detail were developed for use by geothermal operators, public utilities, and lending institutions who require a means to estimate the value of a given resource, total project costs, and the sensitivity of these values to specific variables. A number of the models are capable of economically assessing engineering aspects of geothermal projects. Computerized simulations of heat distribution and fluid flow have been assessed and are presented for ten models. Five of the models are identified as wellbore simulators and five are described as reservoir simulators. Each model is described in terms of its operational characteristics, input, output, and other pertinent attributes. Geothermal energy data bases are reviewed with respect to their current usefulness and availability. Summaries of eight data bases are provided in catalogue format, and an overall comparison of the elements of each data base is included.

Kenkeremath, D. (ed.)

1985-05-01T23:59:59.000Z

291

Improved mesh based photon sampling techniques for neutron activation analysis  

SciTech Connect (OSTI)

The design of fusion power systems requires analysis of neutron activation of large, complex volumes, and the resulting particles emitted from these volumes. Structured mesh-based discretization of these problems allows for improved modeling in these activation analysis problems. Finer discretization of these problems results in large computational costs, which drives the investigation of more efficient methods. Within an ad hoc subroutine of the Monte Carlo transport code MCNP, we implement sampling of voxels and photon energies for volumetric sources using the alias method. The alias method enables efficient sampling of a discrete probability distribution, and operates in 0(1) time, whereas the simpler direct discrete method requires 0(log(n)) time. By using the alias method, voxel sampling becomes a viable alternative to sampling space with the 0(1) approach of uniformly sampling the problem volume. Additionally, with voxel sampling it is straightforward to introduce biasing of volumetric sources, and we implement this biasing of voxels as an additional variance reduction technique that can be applied. We verify our implementation and compare the alias method, with and without biasing, to direct discrete sampling of voxels, and to uniform sampling. We study the behavior of source biasing in a second set of tests and find trends between improvements and source shape, material, and material density. Overall, however, the magnitude of improvements from source biasing appears to be limited. Future work will benefit from the implementation of efficient voxel sampling - particularly with conformal unstructured meshes where the uniform sampling approach cannot be applied. (authors)

Relson, E.; Wilson, P. P. H.; Biondo, E. D. [University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706 (United States)

2013-07-01T23:59:59.000Z

292

EIS-0163: 1992 Columbia River Salmon Flow Measures Options Analysis/EIS  

Broader source: Energy.gov [DOE]

The U.S. Army Corps of Engineers Ė Walla Walla District prepared this statement to analyze four general alternatives to modify the flow of water in the lower Columbia-Snake River in order to help anadromous fish migrate past eight multipurpose Federal dams. The U.S. Department of Energyís Bonneville Power Administration served as a cooperating agency due to its key role in direct operation of the integrated and coordinated Columbia-Snake River System, and adopted this statement on February 10, 1992.

293

DAMOCO: MATLAB toolbox for multivariate data analysis, based on coupled oscillators approach  

E-Print Network [OSTI]

DAMOCO: MATLAB toolbox for multivariate data analysis, based on coupled oscillators approach This manual describes the collection of MATLAB programs for multivariate data analysis, based on modeling.agnld.uni-potsdam.de/~mros/damoco.html. 1 Introduction DAMOCO means Data Analysis with Models Of Coupled Oscillators. This MATLAB toolbox

Potsdam, Universität

294

RISK MANAGEMENT AND RISK ANALYSIS-BASED DECISION TOOLS FOR ATTACKS ON  

E-Print Network [OSTI]

RISK MANAGEMENT AND RISK ANALYSIS- BASED DECISION TOOLS FOR ATTACKS ON ELECTRIC POWER Simonoff, J.usc.edu/create Report #04-004DRAFT #12;Risk Management and Risk Analysis-Based Decision Tools for Attacks on Electric for Risk and Economic Analysis of Terrorism Events University of Southern California Los Angeles

Wang, Hai

295

A Conceptual Framework for Semantic Case-based Safety Analysis Olawande Daramola, Tor Stlhane  

E-Print Network [OSTI]

.biffl}@tuwien.ac.at Abstract Hazard and Operability (HAZOP) Analysis and Fail- ure Mode and Effect Analysis (FMEA) are among-based framework for safety analy- sis, which facilitates the reuse of previous HAZOP and FMEA experiences in order application. Key words: Safety analysis, HAZOP, FMEA, ontology, requirements, case-based reasoning, natural

296

Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System  

SciTech Connect (OSTI)

When the POSRV equipped in a nuclear power plant opens in instant by a failure in coolant system of PWR, a moving shock wave generates, and propagates downstream of the valve, inducing a complicated unsteadiness. The moving shock wave may exert severe load to the structure. In this connection, a method of gradual opening of the valve is used to reduce the load acting on the wall at the downstream of the POSRV. In the present study, experiments and calculations are performed to investigate the detail unsteady flow at the various pipe units and the effect of valve opening time on the flow downstream of the valve. In calculation by using of air as working fluid, 2-dimensional, unsteady compressible Navier-Stokes equations are solved by finite volume method. It was found that when the incident shock wave passes through the pipe unit, it may experience diffraction, reflection and interaction with a vortex. Furthermore, the geometry of the pipe unit affects the reflection type of shock wave and changes the load acting on the wall of pipe unit. It was also turned out that the maximum force acting on the wall of the pipe unit becomes in order of T-junction, 108 deg. elbow and branch in magnitude, respectively. And, the results obtained that show that the rapid pressure rise due to the moving shock wave by instant POSRV valve opening is attenuated by employing the gradual opening. (authors)

Kwon, Soon-Bum; Lee, Dong-Won [Department of Mechanical Engineering, Kyungpook National University, 1370, Sankyuk-dong, Daegu 702-701 (Korea, Republic of); Kim, In-Goo; Ahn, Hyung-Joon; Kim, Hho-Jung [Korea Institute of Nuclear Safety, 19, Kusungdong, Yousungku, Daejon 305-338 (Korea, Republic of)

2004-07-01T23:59:59.000Z

297

Analysis of Fault Permeability Using Mapping and Flow Modeling, Hickory Sandstone Aquifer, Central Texas  

SciTech Connect (OSTI)

Reservoir compartments, typical targets for infill well locations, are commonly created by faults that may reduce permeability. A narrow fault may consist of a complex assemblage of deformation elements that result in spatially variable and anisotropic permeabilities. We report on the permeability structure of a km-scale fault sampled through drilling a faulted siliciclastic aquifer in central Texas. Probe and whole-core permeabilities, serial CAT scans, and textural and structural data from the selected core samples are used to understand permeability structure of fault zones and develop predictive models of fault zone permeability. Using numerical flow simulation, it is possible to predict permeability anisotropy associated with faults and evaluate the effect of individual deformation elements in the overall permeability tensor. We found relationships between the permeability of the host rock and those of the highly deformed (HD) fault-elements according to the fault throw. The lateral continuity and predictable permeability of the HD fault elements enhance capability for estimating the effects of subseismic faulting on fluid flow in low-shale reservoirs.

Nieto Camargo, Jorge E., E-mail: jorge.nietocamargo@aramco.com; Jensen, Jerry L., E-mail: jjensen@ucalgary.ca [University of Calgary, Department of Chemical and Petroleum Engineering (Canada)

2012-09-15T23:59:59.000Z

298

Design, build and test of an axial flow hydrokinetic turbine with fatigue analysis  

E-Print Network [OSTI]

OpenProp is an open source propeller and turbine design and analysis code that has been in development since 2007 by MIT graduate students under the supervision of Professor Richard Kimball. In order to test the performance ...

Ketcham, Jerod W

2010-01-01T23:59:59.000Z

299

High temperature flow-through device for rapid solubilization and analysis  

DOE Patents [OSTI]

Devices and methods for thermally lysing of biological material, for example vegetative bacterial cells and bacterial spores, are provided. Hot solution methods for solubilizing bacterial spores are described. Systems for direct analysis are disclosed including thermal lysers coupled to sample preparation stations. Integrated systems capable of performing sample lysis, labeling and protein fingerprint analysis of biological material, for example, vegetative bacterial cells, bacterial spores and viruses are provided.

West, Jason A. A.; Hukari, Kyle W.; Patel, Kamlesh D.; Peterson, Kenneth A.; Renzi, Ronald F.

2013-04-23T23:59:59.000Z

300

High temperature flow-through device for rapid solubilization and analysis  

DOE Patents [OSTI]

Devices and methods for thermally lysing of biological material, for example vegetative bacterial cells and bacterial spores, are provided. Hot solution methods for solubilizing bacterial spores are described. Systems for direct analysis are disclosed including thermal lysers coupled to sample preparation stations. Integrated systems capable of performing sample lysis, labeling and protein fingerprint analysis of biological material, for example, vegetative bacterial cells, bacterial spores and viruses are provided.

West, Jason A. A. (Castro Valley, CA); Hukari, Kyle W. (San Ramon, CA); Patel, Kamlesh D. (Dublin, CA); Peterson, Kenneth A. (Albuquerque, NM); Renzi, Ronald F. (Tracy, CA)

2009-09-22T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

PWR FLECHT SEASET 21-rod bundle flow blockage task data and analysis report. NRC/EPRI/Westinghouse Report No. 11. Appendices K-P  

SciTech Connect (OSTI)

This report presents data and limited analysis from the 21-Rod Bundle Flow Blockage Task of the Full-Length Emergency Cooling Heat Transfer Separate Effects and Systems Effects Test Program (FLECHT SEASET). The tests consisted of forced and gravity reflooding tests utilizing electrical heater rods with a cosine axial power profile to simulate PWR nuclear core fuel rod arrays. Steam cooling and hydraulic characteristics tests were also conducted. These tests were utilized to determine effects of various flow blockage configurations (shapes and distributions) on reflooding behavior, to aid in development/assessment of computational models in predicting reflooding behavior of flow blockage configurations, and to screen flow blockage configurations for future 163-rod flow blockage bundle tests.

Loftus, M.J.; Hochreiter, L.E.; Lee, N.; McGuire, M.F.; Wenzel, A.H.; Valkovic, M.M.

1982-09-01T23:59:59.000Z

302

A Multi-Commodity Flow Approach to Maximising Utility in Linked Market-Based Grids  

E-Print Network [OSTI]

. We then obtain a utility-aware distributed algorithm that generates increased utility utility in linked market-driven distributed and Grid systems. In such sys- tems, users submit jobs through-based, utility driven distributed systems, where all participants selfishly attempt to max- imise their own gain

Melbourne, University of

303

A Flow Level Perspective on Base Station Power Allocation in Green Networks  

E-Print Network [OSTI]

the energy-efficiency of base stations operating in the downlink. The energy-efficiency refers to the amount nature of users (referred to as the global energy-efficiency). We emphasize our numerical results that study the influence of the radio conditions, transmit power and the user traffic on the energy-efficiency

Boyer, Edmond

304

Suppressing Riser-Based Slugging in Multiphase Flow by State Feedback  

E-Print Network [OSTI]

of the system, x1 is the total mass of gas in the volume upstream of the riser base (volume one), x2 is the total mass of gas in the riser (volum or vertical pipe sections, and is potentially damaging to downstream processing equipment such as separators

Foss, Bjarne A.

305

Recession-based hydrological models for estimating low flows in ungauged catchments in the Himalayas Hydrology and Earth System Sciences, 8(5), 891902 (2004) EGU  

E-Print Network [OSTI]

Recession-based hydrological models for estimating low flows in ungauged catchments in the Himalayas 891 Hydrology and Earth System Sciences, 8(5), 891902 (2004) © EGU Recession-based hydrological.R. Young1 and S.R. Kansakar2 1 Centre for Ecology and Hydrology,Wallingford, Oxfordshire, OX10 8BB, UK 2

Paris-Sud XI, Université de

306

Analysis and optimization of incompressible separated flow around an airfoil with two finite-gap flaps  

E-Print Network [OSTI]

and a 25% Slotted Flap ((2 = 8. 0' 6s = 0. 0 6f = 20 ) 90 91 36 Pressure Distribution, NACA 23012 with a 17% Fixed Slot and a 25% Slotted Flap (o - 8. 0 , 6s = 0. 0 , 6'f - 40 ) 92 37 Drag Coefficient versus Lift Coefficient for a GA(W)-2 with a... distributed vorticity V(s) on B, and 4s is produced by uniformly distributed sources of strength o(s) on B. For two dimensional flow lv and 4s can be written as: ln r(x, z;s')ds' s J02s e = -I'~s' e(x, z;s )as JO 2 s With these definitions, equation (1...

Anderson, Murray Belser

1988-01-01T23:59:59.000Z

307

Analysis of reactor material experiments investigating corium crust stability and heat transfer in jet impingement flow  

SciTech Connect (OSTI)

Presented is an analysis of the results of the CSTI-1, CSTI-3, and CWTI-11 reactor material experiments in which a jet of molten corium initially at 3080/sup 0/K was directed downward upon a stainless steel plate. The experiments are a continuation of a program of reactor material tests investigating LWR severe accident phenomena. Objective of the present analysis is to determine the existence or nonexistence of a corium crust during impingement from comparison of the measured heatup of the plate (as measured by thermocouples imbedded immediately beneath the steel surface) with model calculations assuming alternately the presence and absence of a stable crust during impingement.

Sienicki, J.J.; Spencer, B.W.

1985-01-01T23:59:59.000Z

308

Concurrent design of facility layout and flow-based department formation  

E-Print Network [OSTI]

of their similarities in manufacturing and design [30]. The department may be formed based on the product family, the process, or a combination of both, and the part-machine incidence matrix is traditionally used to form the department. The fractal layout [31, 32... be placed randomly throughout the manufacturing facility with no speci?c department boundary, while the product family and fractal layout assume that the number of departments and the maximum number of machines assigned to each department are known...

Chae, Junjae

2005-02-17T23:59:59.000Z

309

Panorama: Capturing System-wide Information Flow for Malware Detection and Analysis  

E-Print Network [OSTI]

breaching users' privacy (including keyloggers, pass- word thieves, network sniffers, stealth backdoors to remote servers in certain settings. We believe that a system such This material is based upon work

Kruegel, Christopher

310

Global helioseismic evidence for a deeply penetrating Solar meridional flow consisting of multiple flow cells  

E-Print Network [OSTI]

We use a novel global helioseismic analysis method to infer the meridional flow in the deep Solar interior. The method is based on the perturbation of eigenfunctions of Solar p modes due to meridional flow. We apply this method to time series obtained from Dopplergrams measured by the Michelson Doppler Imager aboard the Solar and Heliospheric Observatory (SOHO) covering the observation period 2004-2010. Our results show evidence that the meridional flow reaches down to the base of the convection zone. The flow profile has a complex spatial structure consisting of multiple flow cells distributed in depth and latitude. Toward the Solar surface, our results are in good agreement with flow measurements from local helioseismology.

Schad, A; Roth, M

2013-01-01T23:59:59.000Z

311

E-Print Network 3.0 - activity based analysis Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sciences 4 Reasoning about Repairability of Workflows at Design Time Summary: activities can be provided by the workflow designer based on the analysis of different aspects...

312

Fluid Flow and Thermodynamic Analysis of a Wing Anti-Icing System  

E-Print Network [OSTI]

is installed on most passenger airplanes. It introduces hot bleeding air from the power plant into the wing-mail: liu@utias.utoronto.ca Received 26 August 2003. 1. INTRODUCTION The thermal anti-icing system of this paper is to apply the existing CFD tools to assist the system modeling and simulation analysis

Liu, Hugh H.T.

313

Fusion Engineering and Design 82 (2007) 22172225 Integrated thermo-fluid analysis towards helium flow  

E-Print Network [OSTI]

Fusion Engineering and Design 82 (2007) 2217­2225 Integrated thermo-fluid analysis towards helium. Andob, I. Komadab a Fusion Engineering Sciences, Mechanical and Aerospace Eng. Department, University the ITER test blanket module (TBM) warrants the need of extensive computer aided engineering (CAE

Abdou, Mohamed

314

Validation Analysis for the Calculation of a Turbulent Free Jet in Water Using CFDS-FLOW 3-D and FLUENT  

SciTech Connect (OSTI)

The application of computational fluid dynamics methods to the analysis of mixing in the high level waste tanks at the Savannah River Site requires a demonstration that the computer codes can properly represent the behavior of fluids in the tanks. The motive force for mixing the tanks is a set of jet pumps taking suction from the tank fluid and discharging turbulent jets near the bottom of the tank. The work described here focuses on the free turbulent jet in water as the simplest case of jet behavior for which data could be found in the open literature. Calculations performed with both CFDS-FLOW3D and FLUENT were compared with data as well as classical jet theory. Results showed both codes agreed reasonably well with each other and with the data, but that results were sensitive to the computational mesh and, to a lesser degree, the selection of turbulence models.

Dimenna, R.A.; Lee, S.Y.

1995-05-01T23:59:59.000Z

315

A flood-based information flow analysis and network minimization method for gene regulatory networks  

E-Print Network [OSTI]

tend to have high interconnectivity, complex topologies andSince feedback and high interconnectivity is common in gene

Pavlogiannis, Andreas; Mozhayskiy, Vadim; Tagkopoulos, Ilias

2013-01-01T23:59:59.000Z

316

Flow-based pipeline for systematic modulation and analysis of 3D tumor microenvironments  

E-Print Network [OSTI]

The cancer microenvironment, which incorporates interactions with stromal cells, extracellular matrix (ECM), and other tumor cells in a 3-dimensional (3D) context, has been implicated in every stage of cancer development, ...

Li, Cheri Y.

317

Thermally-driven flows between a Leidenfrost solid and a ratchet surface  

E-Print Network [OSTI]

The significance of thermally-driven flows for the propulsion of Leidenfrost solids on a ratchet surface is studied based on a numerical solution of the Boltzmann equation. In contrast to a previous analysis, it is found that no significant thermal creep flow is established. Instead, the flow pattern is dominated by thermal edge and thermal-stress slip flow, the latter being directed opposite to thermal creep flow. However, in total thermally-induced flows only make a minor contribution to the propulsion of Leidenfrost solids on ratchet surfaces which is dominated by the pressure-driven flow due to the sublimating solid.

Hardt, Steffen; Baier, Tobias

2012-01-01T23:59:59.000Z

318

Automatic stock market trading based on Technical Analysis.  

E-Print Network [OSTI]

?? The theory of technical analysis suggests that future stock price developement can be foretold by analyzing historical price fluctuations and identifying repetitive patterns. AÖ (more)

Larsen, Fredrik

2007-01-01T23:59:59.000Z

319

Geographically-Based Hydrogen Demand & Infrastructure Rollout Scenario Analysis (Presentation)  

SciTech Connect (OSTI)

This presentation by Margo Melendez at the 2007 DOE Hydrogen Program Annual Merit Review Meeting provides information about NREL's Hydrogen Demand & Infrastructure Rollout Scenario Analysis.

Melendez, M.

2007-05-17T23:59:59.000Z

320

Analysis of Heat Transfer in Metal Hydride Based Hydrogen Separation  

SciTech Connect (OSTI)

This thesis presents a transient heat transfer analysis to model the heat transfer in the Pd/k packed column, and the impact of adding metallic foam.

Fleming, W.H. Jr.

1999-10-20T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

MULTI-POLLUTANT CONTROL USING MEMBRANE--BASED UP-FLOW WET ELECTROSTATIC PRECIPITATION  

SciTech Connect (OSTI)

This is the second quarterly report of the ''Multi-Pollutant Control Using Membrane-Based Upflow Wet Electrostatic Precipitation'' project funded by the US Department of Energy's National Energy Technology Laboratory under DOE Award No. DE-FC26-02NT41592 to Croll-Reynolds Clean Air Technologies (CRCAT). In this 18 month project, CRCAT and its team members will conduct detailed emission tests of metallic and new membrane collection material within a wet electrostatic precipitator (WESP) at First Energy's Penn Power's Bruce Mansfield (BMP) plant in Shippingport, Pa. Test results performed on the existing metallic WESP during November of 2002 showed consistent results with previous test results. Average collection efficiency of 89% on SO{sub 3} mist was achieved. Additionally, removal efficiencies of 62% were achieved at very high velocity, greater than 15 ft./sec. During the first quarter of 2003 final design and start of fabrication of the membrane wet ESP was undertaken.

James Reynolds

2003-04-30T23:59:59.000Z

322

MULTI-POLLUTANT CONTROL USING MEMBRANE-BASED UP-FLOW WET ELECTROSTATIC PRECIPITATION  

SciTech Connect (OSTI)

This is the first quarterly report of the ''Multi-Pollutant Control Using Membrane--Based Upflow Wet Electrostatic Precipitation'' project funded by the US Department of Energy's National Energy Technology Laboratory under DOE Award No. DE-FC26-02NT41592 to Croll-Reynolds Clean Air Technologies (CRCAT). In this 18 month project, CRCAT and its team members will conduct detailed emission tests of metallic and new membrane collection material within a wet electrostatic precipitator (WESP) at First Energy's Penn Power's Bruce Mansfield (BMP) plant in Shippingport, Pa. Test results performed on the existing metallic WESP during November of 2002 showed consistent results with previous test results. Average collection efficiency of 89% on SO{sub 3} mist was achieved. Additionally, removal efficiencies of 62% were achieved at very high velocity, greater than 15 ft./sec.

James Reynolds

2003-01-01T23:59:59.000Z

323

Analysis of Flow of Control for Reverse Engineering of Sequence Diagrams  

E-Print Network [OSTI]

of The Ohio State University By Olga Nicole Volgin, B.S. * * * * * The Ohio State University 2005 Master and Information Science #12;ABSTRACT During software lifecycle, the design documentation and implementation often enhancement based on inaccurate documentation may result in costly software design and implementation flaws

Rountev, Atanas "Nasko"

324

Transportation Analysis, Modeling, and Simulation (TAMS) Application  

E-Print Network [OSTI]

Transportation Analysis, Modeling, and Simulation (TAMS) Application Center for Transportation Passenger Flows Supply Chain Efficiency Transportation: Energy Environment Safety Security Vehicle Technologies T he Center for Transportation Analysis (CTA) TAMS application is a web-based tool that supports

325

Flow injection analysis of phenolic compounds with carbon paste electrodes modified with tyrosinase purchased from different companies  

SciTech Connect (OSTI)

Tyrosinase-modified carbon paste electrodes were prepared using lyophilised powder of the enzyme purchased from different companies. The selectivity of these electrodes for nine phenolic compounds, including six substituted catechols, has been studied. The signals obtained for catechol were always higher than those found for other phenolic compounds. Cyclic voltammetry and flow injection measurements indicated that the response of the tyrosinase-modified carbon paste electrodes was limited by the rate of the enzymatic oxidation of catechols. Different approaches of past electrode preparation have been studied and compared. Direct mixing of enzyme into the graphite powder doped with the osmium based mediator, resulted in the highest sensitivity for the studied substrates. However, substrate selectivity was found to be dependent on the source of enzyme used for electrode preparation.

Lindgren, A.; Emneus, J.; Csoeregi, E.; Gorton, L.; Marko-Varga, G. [Univ. of Lund (Sweden); Ruzgas, T. [Inst. of Biochemistry, Vilnius (Lithuania)

1996-05-01T23:59:59.000Z

326

European Wind Energy Conference 2007 Milan Measurement based analysis of active and reactive power  

E-Print Network [OSTI]

of the electricity is produced by wind turbines and combined heat and power plants (CHPs). Most of them are connected heat and power plants. The investigation is based on 15 min average power measurements and load flow power losses in a distribution network with wind farms and CHPs 1 Introduction In Denmark, a large part

327

An analog analysis of transient heat flow in solids with temperature-dependent thermal properties  

E-Print Network [OSTI]

they both are based on the same approximation of the thermal properties. Since these two methods of solution of the same problem produce almost the same results, the usefulness of the constant property analog method of solution must be found elsewhere... calculations. Therefore, it is concluded that the better the approximation of the variation of the thermal properties allowed by a method of solution, the more closely that method of solution will agree with the actual physical problem. In particular...

Lee, Dwain Edward

1964-01-01T23:59:59.000Z

328

Analysis of pressure buildup curves based on field experience  

SciTech Connect (OSTI)

This paper deals with the application of pressure build-up data in computing vital reservoir parameters in oil fields. Generally the technique of Miller Dyes and Hutchinson is utilized to determine flow capacity, permeability skin effect and completion efficiency. Pressure build-up data is utilized in detecting the existence of faults. The method of Brons and Marting has been found to be more reliable to determine the partial penetration effect. The computer software package which was developed recently is discussed and, due to near ideal behaviour of pressure build-up curves, is safely utilized. The computational work using the software package is rapid.

Arora, P.D.

1983-03-01T23:59:59.000Z

329

Computeer-based decision support tools for evaluation of actions affecting flow and water quality in the San Joaquin Basin  

SciTech Connect (OSTI)

This document is a preliminary effort to draw together some of the important simulation models that are available to Reclamation or that have been developed by Reclamation since 1987. This document has also attempted to lay out a framework by which these models might be used both for the purposes for which they were originally intended and to support the analysis of other issues that relate to the hydrology and to salt and water quality management within the San Joaquin Valley. To be successful as components of a larger Decision Support System the models should to be linked together using custom designed interfaces that permit data sharing between models and that are easy to use. Several initiatives are currently underway within Reclamation to develop GIS - based and graphics - based decision support systems to improve the general level of understanding of the models currently in use, to standardize the methodology used in making planning and operations studies and to permit improved data analysis, interpretation and display. The decision support systems should allow greater participation in the planning process, allow the analysis of innovative actions that are currently difficult to study with present models and should lead to better integrated and more comprehensive plans and policy decisions in future years.

Quinn, N.W.T.

1993-01-01T23:59:59.000Z

330

Inverting geodetic time series with a principal component analysis-based inversion method  

E-Print Network [OSTI]

Inverting geodetic time series with a principal component analysis-based inversion method A. P (2010), Inverting geodetic time series with a principal component analysis-based inversion method, J; Cohen, 1999]. This formulation is linear and easily inverted using standard algorithms. The distribution

Avouac, Jean-Philippe

331

Expected Productivity-Based Risk Analysis in Conceptual Design: With Application to the  

E-Print Network [OSTI]

of Philosophy Abstract During the design process, risk is mentioned often, but, due to the lackExpected Productivity-Based Risk Analysis in Conceptual Design: With Application to the Terrestrial;Expected Productivity-Based Risk Analysis in Conceptual Design: With Application to the Terrestrial Planet

332

Event-based Approach to Money Laundering Data Analysis and Visualization  

E-Print Network [OSTI]

Event-based Approach to Money Laundering Data Analysis and Visualization Tat-Man Cheong Faculty, an event-based approach to money laundering data analysis and visualization is proposed in this paper. The effectiveness of the proposed method is demonstrated on a money laundering case from Taiwan. Categories

Si, Yain Whar "Lawrence"

333

Interactive Transient and Steady-state Analysis of Regional Ice Flow C30-W65A Jed Brown jedbrown@mcs.anl.gov, Iulian Grindeanu, Dmitry Karpeev, Barry Smith, Tim Tautges  

E-Print Network [OSTI]

Interactive Transient and Steady-state Analysis of Regional Ice Flow C30-W65A Jed Brown jedbrown/files/WCRP2011-RegionalIceFlow.pdf Preprocessing Model data for a regional ice flow models often comes from many. From these inputs, univer- sal kriging is used to produce an initial fine triangular mesh, this mesh

Brown, Jed

334

Parallel-Flow-Shear Driven Low-Frequency Plasma Instability  

SciTech Connect (OSTI)

Full three dimensional Particle-in-Cell (PIC) simulations are performed in order to investigate effects of field-aligned (parallel) ion flow shears on low-frequency plasma instabilities. It is shown that the parallel ion flow velocity shear can induce the ion-acoustic instability, even when the ion flow velocity is so small that the instability can not take place. Simulation results are consistent with the analysis based on the local theory.

Ishiguro, Seiji [Theory and Computer Simulation Center, National Institute for Fusion Science, Toki-shi, Gifu 509-5292 (Japan); Matsumoto, Noriaki; Kaneko, Toshiro; Hatakeyama, Rikizo [Department of Electronic Engineering, Tohoku University, Sendai 980-8579 (Japan)

2004-12-01T23:59:59.000Z

335

Improving the Accuracy of Software-Based Energy Analysis for Residential Buildings (Presentation)  

SciTech Connect (OSTI)

This presentation describes the basic components of software-based energy analysis for residential buildings, explores the concepts of 'error' and 'accuracy' when analysis predictions are compared to measured data, and explains how NREL is working to continuously improve the accuracy of energy analysis methods.

Polly, B.

2011-09-01T23:59:59.000Z

336

A network-based modeling framework for stakeholder analysis of China's energy conservation campaign  

E-Print Network [OSTI]

A network-based modeling framework for stakeholder analysis of China's energy conservation campaign Available online 13 July 2011 Keywords: Energy conservation Policy-making Stakeholder analysis Network, the stakeholder analysis of China's energy conservation campaign still has been under-developed. This paper

de Weck, Olivier L.

337

Shape-based Cost Analysis of Skeletal Parallel Programs†  

E-Print Network [OSTI]

This work presents an automatic cost-analysis system for an implicitly parallel skeletal programming language. Although deducing interesting dynamic characteristics of parallel programs (and in particular, run time) is ...

Hayashi, Yasushi

338

Network Based Evaluation Method for Financial Analysis of Toll Roads  

E-Print Network [OSTI]

was $25,003 millions (Yescombe, 2002). There are three main quantitative methods for pricing of bonds used in the credit risk analysis: structural, reduced, and incomplete information approach (Giesecke, 2004). At the center of the credit risk...

Vajdic, Nevena

2011-02-22T23:59:59.000Z

339

analysis system based: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

energy consumption and component stresses and instabilities. 1. FOREWORDS The micro-gas turbine based energy conversion systems represent one of the most recently developed...

340

Analysis of turbulent transport and mixing in transitional Rayleigh/Taylor unstable flow using direct numerical simulation data  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

Data from a 1152X760X1280 direct numerical simulation (DNS) [N. J. Mueschke and O. Schilling, Phys. Fluids 21, 014106 (2009)] of a transitional Rayleigh-Taylor mixing layer modeled after a small Atwood number water channel experiment is used to comprehensively investigate the structure of mean and turbulent transport and mixing. The simulation had physical parameters and initial conditions approximating those in the experiment. The budgets of the mean vertical momentum, heavy-fluid mass fraction, turbulent kinetic energy, turbulent kinetic energy dissipation rate, heavy-fluid mass fraction variance, and heavy-fluid mass fraction variance dissipation rate equations are constructed using Reynolds averaging applied to the DNS data. The relative importance of mean and turbulent production, turbulent dissipation and destruction, and turbulent transport are investigated as a function of Reynolds number and across the mixing layer to provide insight into the flow dynamics not presently available from experiments. The analysis of the budgets supports the assumption for small Atwood number, Rayleigh/Taylor driven flows that the principal transport mechanisms are buoyancy production, turbulent production, turbulent dissipation, and turbulent diffusion (shear and mean field production are negligible). As the Reynolds number increases, the turbulent production in the turbulent kinetic energy dissipation rate equation becomes the dominant production term, while the buoyancy production plateaus. Distinctions between momentum and scalar transport are also noted, where the turbulent kinetic energy and its dissipation rate both grow in time and are peaked near the center plane of the mixing layer, while the heavy-fluid mass fraction variance and its dissipation rate initially grow and then begin to decrease as mixing progresses and reduces density fluctuations. All terms in the transport equations generally grow or decay, with no qualitative change in their profile, except for the pressure flux contribution to the total turbulent kinetic energy flux, which changes sign early in time (a countergradient effect). The production-to-dissipation ratios corresponding to the turbulent kinetic energy and heavy-fluid mass fraction variance are large and vary strongly at small evolution times, decrease with time, and nearly asymptote as the flow enters a self-similar regime. The late-time turbulent kinetic energy production-to-dissipation ratio is larger than observed in shear-driven turbulent flows. The order of magnitude estimates of the terms in the transport equations are shown to be consistent with the DNS at late-time, and also confirms both the dominant terms and their evolutionary behavior. These results are useful for identifying the dynamically important terms requiring closure, and assessing the accuracy of the predictions of Reynolds-averaged Navier-Stokes and large-eddy simulation models of turbulent transport and mixing in transitional Rayleigh-Taylor instability-generated flow.

Schilling, Oleg [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Mueschke, Nicholas J. [Texas A and M Univ., College Station, TX (United States)

2010-10-18T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Computational Methods for Analyzing Fluid Flow Dynamics from Digital Imagery  

SciTech Connect (OSTI)

The main goal (long term) of this work is to perform computational dynamics analysis and quantify uncertainty from vector fields computed directly from measured data. Global analysis based on observed spatiotemporal evolution is performed by objective function based on expected physics and informed scientific priors, variational optimization to compute vector fields from measured data, and transport analysis proceeding with observations and priors. A mathematical formulation for computing flow fields is set up for computing the minimizer for the problem. An application to oceanic flow based on sea surface temperature is presented.

Luttman, A.

2012-03-30T23:59:59.000Z

342

Analysis of Refrigerant Flow and Deformation for a Flexible Short-Tube using a Finite Element Model  

E-Print Network [OSTI]

reliability. Short-tubes have either a constant inner dia- meter flow channel or a tapered channel with a smallAbstract A finite element model was used to simulate single-phase flow of R-22 through flexible short-tubes. The numerical model included the fluid... in the flow area. The more flexible (5513 kPa) short-tube restricted the mass flow rate more than the most rigid (9889 kPa) short-tube used in this study. The mass flow rates estimated with the finite element model were as much as 14% higher than those from...

O'Neal, D.L.; Bassiouny, R.

343

Michael Wachendorf, slaug Helgadttir, Giuseppe Parente [editors]: Sward dynamics, N-flows and forage utilization in legume-based systems. Proceedings of the 2nd  

E-Print Network [OSTI]

-flows and forage utilization in legume-based systems. Proceedings of the 2nd COST 852 workshop held in Grado, Italy. A common problem is the use of various indices of "biodiversity effect" in statistical analyses experiments and real agriculture by the experimenter and farmer respectively. In real ecological communities

Leps, Jan "Suspa"

344

CHAPTER 7. BERYLLIUM ANALYSIS BY NON-PLASMA BASED METHODS  

SciTech Connect (OSTI)

The most common method of analysis for beryllium is inductively coupled plasma atomic emission spectrometry (ICP-AES). This method, along with inductively coupled plasma mass spectrometry (ICP-MS), is discussed in Chapter 6. However, other methods exist and have been used for different applications. These methods include spectroscopic, chromatographic, colorimetric, and electrochemical. This chapter provides an overview of beryllium analysis methods other than plasma spectrometry (inductively coupled plasma atomic emission spectrometry or mass spectrometry). The basic methods, detection limits and interferences are described. Specific applications from the literature are also presented.

Ekechukwu, A

2009-04-20T23:59:59.000Z

345

Security Analysis and Improvement Model for Web-based Applications  

E-Print Network [OSTI]

, confidentiality, and data integrity. According to the reports from http://www.securityfocus.com in May 2006, operating systems account for 9% vulnerability, web-based software systems account for 61% vulnerability, and other applications account for 30...

Wang, Yong

2010-01-14T23:59:59.000Z

346

Dealing with big circulation flow, small temperature difference based on verified dynamic model simulations of a hot water district heating system  

E-Print Network [OSTI]

DEALING WITH ďBIG CIRCULATION FLOW RATE, SMALL TEMPERATURE DIFFERENCEĒ BASED ON VERIFIED DYNAMIC MODEL SIMULATIONS OF A HOT WATER DISTRICT HEATING SYSTEM Li Lian Zhong, Senior Sales Consultant, Danfoss Automatic Controls Management (Shanghai...) Co.,Ltd, Anshan, China ABSTRACT Dynamic models of an indirect hot water district heating system were developed based on the first principle of thermodynamics. The ideal model was verified by using measured operational data. The ideal...

Zhong, L.

2014-01-01T23:59:59.000Z

347

Laser Ablation Sampling of Materials Directly into the Formed Liquid Microjunction of a Continuous Flow Surface Sampling Probe/Electrospray Ionization Emitter for Mass Spectral Analysis and Imaging  

SciTech Connect (OSTI)

Transmission geometry laser ablation directly into a formed liquid microjunction of a continuous flow liquid microjunction surface sampling probe/electrospray ionization emitter was utilized for molecular and elemental detection and mass spectrometry imaging. The ability to efficiently capture and ionize ablated material was demonstrated by the detection of various small soluble n-mers of polyaniline and silver ion solvent clusters formed from laser ablation of electropolymerized polyaniline and silver thin films, respectively. In addition, analysis of surfaces that contain soluble components was accomplished by coating or laminating the sample with an insoluble film to enable liquid junction formation without directly extracting material from the surface. The ability to perform mass spectrometry imaging at a spatial resolution of about 50 m was illustrated by using laminated inked patterns on a microscope slide. In general, these data demonstrate at least an order of magnitude signal enhancement compared to the non-contact, laser ablation droplet capture-based surface sampling/ionization approaches that have been previously presented.

Ovchinnikova, Olga S [ORNL] [ORNL; Lorenz, Matthias [ORNL] [ORNL; Kertesz, Vilmos [ORNL] [ORNL; Van Berkel, Gary J [ORNL] [ORNL

2013-01-01T23:59:59.000Z

348

Comparison of MRI-based and CT/MRI fusion-based postimplant dosimetric analysis of prostate brachytherapy  

SciTech Connect (OSTI)

Purpose: The aim of this study was to compare the outcomes between magnetic resonance imaging (MRI)-based and computed tomography (CT)/MRI fusion-based postimplant dosimetry methods in permanent prostate brachytherapy. Methods and Materials: Between October 2004 and March 2006, a total of 52 consecutive patients with prostate cancer were treated by brachytherapy, and postimplant dosimetry was performed using CT/MRI fusion. The accuracy and reproducibility were prospectively compared between MRI-based dosimetry and CT/MRI fusion-based dosimetry based on the dose-volume histogram (DVH) related parameters as recommended by the American Brachytherapy Society. Results: The prostate volume was 15.97 {+-} 6.17 cc (mean {+-} SD) in MRI-based dosimetry, and 15.97 {+-} 6.02 cc in CT/MRI fusion-based dosimetry without statistical difference. The prostate V100 was 94.5% and 93.0% in MRI-based and CT/MRI fusion-based dosimetry, respectively, and the difference was statistically significant (p = 0.002). The prostate D90 was 119.4% and 114.4% in MRI-based and CT/MRI fusion-based dosimetry, respectively, and the difference was statistically significant (p = 0.004). Conclusion: Our current results suggested that, as with fusion images, MR images allowed accurate contouring of the organs, but they tended to overestimate the analysis of postimplant dosimetry in comparison to CT/MRI fusion images. Although this MRI-based dosimetric discrepancy was negligible, MRI-based dosimetry was acceptable and reproducible in comparison to CT-based dosimetry, because the difference between MRI-based and CT/MRI fusion-based results was smaller than that between CT-based and CT/MRI fusion-based results as previously reported.

Tanaka, Osamu [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan)]. E-mail: osa-mu@umin.ac.jp; Hayashi, Shinya [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan); Matsuo, Masayuki [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan); Sakurai, Kota [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan); Department of Urology, Gifu University School of Medicine, Gifu City (Japan); Nakano, Masahiro [Department of Urology, Gifu University School of Medicine, Gifu City (Japan); Maeda, Sunaho [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan); Kajita, Kimihiro R.T. [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan); Deguchi, Takashi [Department of Urology, Gifu University School of Medicine, Gifu City (Japan); Hoshi, Hiroaki [Department of Radiology, Gifu University School of Medicine, Gifu City (Japan)

2006-10-01T23:59:59.000Z

349

Internet-based Self-Services from Analysis and  

E-Print Network [OSTI]

costs (PaaS) #12;ITIL IMS Use Case ­Incident Management Service (IMS) ­ From ITIL ­Blueprint >> ­Resolve incidents ­ Disks errors ­ Printers not working ITIL = Information Technology Infrastructure Library #12 into a commercial PaaS platform. #12;Service analysis · Use weak semantics to identify ISS main concepts · ITIL

Miller, John A.

350

Functional Gene Array-Based Analysis of Microbial Community  

E-Print Network [OSTI]

correspondence analysis indicate that nitrate, sulfate, pH, uranium, and technetium have a significant (p diversity with geochemistry, we can better understand which variables are most important in deter- mining studied for bioremediation of heavy metals due to legacy contamination from Cold War-era uranium

Hazen, Terry

351

HMM-based neural spike analysis Michael C. Nechyba  

E-Print Network [OSTI]

· Generating training data · Results · Current/future work #12;Classifier block diagram s O Ot N­ 1+ Ot N­ 2+ Ot 1­ Ot, , ,{ }= P O s( ) ... vt P O m( ) m signal-to-symbol conversion HMM (stationary) HMM (moving procedures) 7. Human control strategy analysis (e.g. driving) 8. Robot control (e.g. autonomous driving) 9

Slatton, Clint

352

Accessibility analysis for telecommuting: a GIS-based approach  

E-Print Network [OSTI]

and policy-makers. Research on telecommuting as one solution to reducing travel demand has been active in the past few years. However, most research focuses on analysis of the impact of telecommuting on vehicle-mobility rather than on individual accessibility...

Chen, Chun

2001-01-01T23:59:59.000Z

353

LOSS OF COOLANT ACCIDENT AND LOSS OF FLOW ACCIDENT ANALYSIS OF THE ARIES-AT DESIGN E. A. Mogahed, L. El-Guebaly, A. Abdou, P. Wilson, D. Henderson and the ARIES Team  

E-Print Network [OSTI]

LOSS OF COOLANT ACCIDENT AND LOSS OF FLOW ACCIDENT ANALYSIS OF THE ARIES-AT DESIGN E. A. Mogahed, L accident (LOCA) and loss of flow accident (LOFA) analysis is performed for ARIES-AT, an advanced fusion of steel in the reactor is about (600 ¬įC - 700¬įC) after about 4 days from the onset of the accident

California at San Diego, University of

354

Expeditious Data Center Sustainability, Flow, and Temperature Modeling: Life-Cycle Exergy Consumption Combined with a Potential Flow Based, Rankine Vortex Superposed, Predictive Method  

E-Print Network [OSTI]

Methodology iii Life-Cycle Assessment (LCA) . . . . . . .Results 6.1 Life-Cycle Assessment (LCA) . . . . . 6.1.1Analysis (LCEA) 4. Life-Cycle Assessment (LCA) 5. Exergetic

Lettieri, David

2012-01-01T23:59:59.000Z

355

Analysis of reactor material experiments investigating oxide fuel crust stability and heat transfer in jet impingement flow  

SciTech Connect (OSTI)

An analysis is presented of the crust stability and heat transfer behavior in the CSTI-1, CSTI-3, and CWTI-11 reactor material experiments in which a jet of molten oxide fuel at approx. 160/sup 0/K above its freezing temperature was impinged normally upon stainless steel plates initially at 300 and 385 K. The major issue is the existence of nonexistence of a stable solidified layer of fuel, or crust, interstitial to the flowing hot fuel and the steel substrate, tending to insulate the steel from the hot molten fuel. A computer model was developed to predict the heatup of thermocouples imbedded immediately beneath the surface of the plate for both of the cases in which a stable crust is assumed to be either present or absent during the impingement phase. Comparison of the model calculations with the measured thermocouple temperatures indicates that a protective crust was present over nearly all of the plate surface area throughout the impingement process precluding major melting of the plate steel. However, the experiments also show evidence for very localized and isolated steel melting as revealed by localized and isolated pitting of the steel surface and the response of thermocouples located within the pitted region.

Sienicki, J.J.; Spencer, B.W.

1985-01-01T23:59:59.000Z

356

Geochip-Based Functional Gene Analysis of Anodophilic  

E-Print Network [OSTI]

organic matter is con- verted to acetate and other fermentation products (primarily butyrate and alcohols the use of only a single substrate (acetate). MECs with the largest hydrogen yields had the highest- cesses such as photosynthesis, photofermentation, and dark fermentation (1, 2). Dark fermentation-based H

357

Geographically-Based Infrastructure Analysis for California | Department of  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensional Subject: Guidance for naturalGeneral ServiceEnergy Analysis

358

Analysis of Geothermal Reservoir Stimulation Using Geomechanics-based  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartment ofEnergy Natural Gas:Austin,AnAnTuba City, Arizona, SiteAnalysis

359

Stochastic Turing patterns: analysis of compartment-based approaches  

E-Print Network [OSTI]

Turing patterns can be observed in reaction-diffusion systems where chemical species have different diffusion constants. In recent years, several studies investigated the effects of noise on Turing patterns and showed that the parameter regimes, for which stochastic Turing patterns are observed, can be larger than the parameter regimes predicted by deterministic models, which are written in terms of partial differential equations for species concentrations. A common stochastic reaction-diffusion approach is written in terms of compartment-based (lattice-based) models, where the domain of interest is divided into artificial compartments and the number of molecules in each compartment is simulated. In this paper, the dependence of stochastic Turing patterns on the compartment size is investigated. It has previously been shown (for relatively simpler systems) that a modeller should not choose compartment sizes which are too small or too large, and that the optimal compartment size depends on the diffusion consta...

Cao, Yang

2013-01-01T23:59:59.000Z

360

Visual detectability analysis associate: a knowledge-based system  

E-Print Network [OSTI]

, Fischer (1982) points out, knowledge-based systems may be used as tools capable of expanding human potential, and Barr and Feigenbaum (1982, p. 81) go on to state that ". . . many systems can be viewed as consultants that formulate opinions and give.... ) describes AI as ". . . the science of making machines do things that would require intelligence if done by man. " Barr and Feigenbaum (1982) describe AI as a branch of computer science which involves the 20 study of the relationship between computation...

Haverda, Tony Houston

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Control of power characteristics of ion flow in plasma-etching reactor based on beam-plasma discharge  

SciTech Connect (OSTI)

It is shown that on the basis of the earlier revealed effect of generating the ion flow in the beam-plasma discharge from the discharge axis, a plasma processing reactor can be created for low-energy etching of semiconductor structures. The possibility of easily controlling the density and energy of ion flow by means of varying the potential of the discharge collector is demonstrated. The charge compensation of the ion flow incident on the nonconducting surface is implemented using the modulation of the potential of the substrate holder as well as the plasma-potential modulation.

Isaev, N. V.; Klykov, I. L.; Shustin, E. G., E-mail: shustin@ms.ire.rssi.ru [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Fryazino Branch) (Russian Federation)

2011-12-15T23:59:59.000Z

362

Terrestrial Remotely Sensed Imagery in Support of Public Health: New Avenues of Research Using Object-Based Image Analysis  

E-Print Network [OSTI]

segmentation-based analysis of geospatial data cananalysis of disease ecology and risk: An example using object-based classification techniques. Geospatial

Kelly, Maggi

2011-01-01T23:59:59.000Z

363

The Phase Inversion-based Coal-CO? Slurry (PHICCOS) feeding system : design, coupled multiscale analysis, and technoeconomic assessment  

E-Print Network [OSTI]

The continuous conveying of a solid feedstock like pulverized coal into a pressurized environment is a challenging task required in multiple industrial processes. Plants based on pressurized, entrained-flow gasifiers (EFG) ...

Botero, Cristina, Ph. D. Massachusetts Institute of Technology

2014-01-01T23:59:59.000Z

364

STAMP-Based Analysis of a Refinery Overflow Accident Nancy Leveson, Margaret Stringfellow, and John Thomas  

E-Print Network [OSTI]

1 STAMP-Based Analysis of a Refinery Overflow Accident Nancy Leveson, Margaret Stringfellow, and John Thomas As an example of STAMP, we have taken an accident report produced for a real refinery

Leveson, Nancy

365

Proof Details for "Performance Analysis of Godard-Based Blind Channel Identification"  

E-Print Network [OSTI]

1 Proof Details for "Performance Analysis of Godard-Based Blind Channel Identification" Philip) The bulk of the proof is spent analyzing the righthand term above. E ^^h(0) i - ^h(0) i 2 2 = E ^^h(0) i 2

Schniter, Philip

366

Analysis of Path Planning Algorithms : a Formal Verification-based Approach Arash Khabbaz Saberi1  

E-Print Network [OSTI]

Analysis of Path Planning Algorithms : a Formal Verification-based Approach Arash Khabbaz Saberi1, The Netherlands a.khabbaz.saberi@student.tue.nl, j.f.groote@tue.nl, s.keshishzadeh@tue.nl Abstract

Groote, Jan Friso

367

Cell Ashing for Trace Element Analysis: A New Approach Based on Ultraviolet/Ozone  

E-Print Network [OSTI]

: synchrotron spectromicroscopy; micro- chemical analysis; MEPHISTO; ashing; incineration; trace element. Ashing ashing is based on high-temperature incineration or on the exposure to oxygen plasma (1­ 4). We adopted

Gilbert, Pupa Gelsomina De Stasio

368

Building Energy Performance Analysis of an Academic Building Using IFC BIM-Based Methodology  

E-Print Network [OSTI]

detailed discussion on various interventions undertaken to calibrate the model. The paper concludes that BIM/IFC based approaches provide a feasible alternative to conduct energy analysis of existing buildings provided various correlations are built...

Aziz, Z.; Arayici, Y.; Shivachev, D.

2012-01-01T23:59:59.000Z

369

Techniques for Hydrograph Synthesis Based on Analysis of Data from Small Drainage Basins in Texas  

E-Print Network [OSTI]

TR-3 1966 Techniques for Hydrograph Synthesis Based on Analysis of Data from Small Drainage Basins in Texas M.D. Hudlow Texas Water Resources Institute Texas A&M University ...

Hudlow, M.D.

370

Monitoring Based Commissioning: Benchmarking Analysis of 24 UC/CSU/IOU Projects  

SciTech Connect (OSTI)

Buildings rarely perform as intended, resulting in energy use that is higher than anticipated. Building commissioning has emerged as a strategy for remedying this problem in non-residential buildings. Complementing traditional hardware-based energy savings strategies, commissioning is a 'soft' process of verifying performance and design intent and correcting deficiencies. Through an evaluation of a series of field projects, this report explores the efficacy of an emerging refinement of this practice, known as monitoring-based commissioning (MBCx). MBCx can also be thought of as monitoring-enhanced building operation that incorporates three components: (1) Permanent energy information systems (EIS) and diagnostic tools at the whole-building and sub-system level; (2) Retro-commissioning based on the information from these tools and savings accounting emphasizing measurement as opposed to estimation or assumptions; and (3) On-going commissioning to ensure efficient building operations and measurement-based savings accounting. MBCx is thus a measurement-based paradigm which affords improved risk-management by identifying problems and opportunities that are missed with periodic commissioning. The analysis presented in this report is based on in-depth benchmarking of a portfolio of MBCx energy savings for 24 buildings located throughout the University of California and California State University systems. In the course of the analysis, we developed a quality-control/quality-assurance process for gathering and evaluating raw data from project sites and then selected a number of metrics to use for project benchmarking and evaluation, including appropriate normalizations for weather and climate, accounting for variations in central plant performance, and consideration of differences in building types. We performed a cost-benefit analysis of the resulting dataset, and provided comparisons to projects from a larger commissioning 'Meta-analysis' database. A total of 1120 deficiency-intervention combinations were identified in the course of commissioning the projects described in this report. The most common location of deficiencies was in HVAC equipment (65% of sites), followed by air-handling and distributions systems (59%), cooling plant (29%), heating plants (24%), and terminal units (24%). The most common interventions were adjusting setpoints, modifying sequences of operations, calibration, and various mechanical fixes (each done in about two-thirds of the sites). The normalized rate of occurrence of deficiencies and corresponding interventions ranged from about 0.1/100ksf to 10/100ksf, depending on the issue. From these interventions flowed significant and highly cost-effective energy savings For the MBCx cohort, source energy savings of 22 kBTU/sf-year (10%) were achieved, with a range of 2% to 25%. Median electricity savings were 1.9 kWh/sf-year (9%), with a range of 1% to 17%. Peak electrical demand savings were 0.2 W/sf-year (4%), with a range of 3% to 11%. The aggregate commissioning cost for the 24 projects was $2.9 million. We observed a range of normalized costs from $0.37 to 1.62/sf, with a median value of $1.00/sf for buildings that implemented MBCx projects. Per the program design, monitoring costs as a percentage of total costs are significantly higher in MBCx projects (median value 40%) than typical commissioning projects included in the Meta-analysis (median value of 2% in the commissioning database). Half of the projects were in buildings containing complex and energy-intensive laboratory space, with higher associated costs. Median energy cost savings were $0.25/sf-year, for a median simple payback time of 2.5 years. Significant and cost-effective energy savings were thus obtained. The greatest absolute energy savings and shortest payback times were achieved in laboratory-type facilities. While impacts varied from project to project, on a portfolio basis we find MBCx to be a highly cost-effective means of obtaining significant program-level energy savings across a variety of building types. Energy savings are ex

Mills, Evan; Mathew, Paul

2009-04-01T23:59:59.000Z

371

Experimental Analysis of Water Based Drilling Fluid Aging Processes at High Temperature and High Pressure Conditions  

E-Print Network [OSTI]

! ! EXPERIMENTAL ANALYSIS OF WATER BASED DRILLING FLUID AGING PROCESSES AT HIGH TEMPERATURE AND HIGH PRESSURE CONDITIONS A Thesis by BRANDON SCOTT ZIGMOND Submitted to the Office of Graduate Studies of Texas A&M University... Temperature and High Pressure Conditions Copyright 2012 Brandon Scott Zigmond ! ! EXPERIMENTAL ANALYSIS OF WATER BASED DRILLING FLUID AGING PROCESSES AT HIGH TEMPERATURE AND HIGH PRESSURE CONDITIONS A Thesis by BRANDON SCOTT ZIGMOND Submitted...

Zigmond, Brandon

2012-10-19T23:59:59.000Z

372

A column based variance analysis approach to static reservoir model upgridding  

E-Print Network [OSTI]

A COLUMN BASED VARIANCE ANALYSIS APPROACH TO STATIC RESERVOIR MODEL UPGRIDDING A Thesis by MATTHEW BRANDON TALBERT Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 2008 Major Subject: Petroleum Engineering A COLUMN BASED VARIANCE ANALYSIS APPROACH TO STATIC RESERVOIR MODEL UPGRIDDING A Thesis by MATTHEW BRANDON TALBERT Submitted to the Office...

Talbert, Matthew Brandon

2008-10-10T23:59:59.000Z

373

Design and analysis of an Extended Kalman Filter based navigator for an autonomous underwater vehicle  

E-Print Network [OSTI]

DESIGN AND ANALYSIS OF AN EXTENDED KALMAN FILTER BASED NAVIGATOR FOR AN AUTONOMOUS UNDERWATER VEHICLE A Thesis by BRADLEY EUGENE JUST Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1994 Major Subject: Mechanical Engineering DESIGN AND ANALYSIS OF AN EXTENDED KALMAN FILTER BASED NAVIGATOR FOR AN AUTONOMOUS UNDERWATER VEHICLE A Thesis by BRADLEY EUGENE JUST Submitted to Texas A...

Just, Bradley Eugene

1994-01-01T23:59:59.000Z

374

PVP-Vol.246/AMD-Vol. 143,New Methods in Transient Analysis COMPUTATION OF UNSTEADY INCOMPRESSIBLE FLOWS  

E-Print Network [OSTI]

element computation of unsteady in- compressible flows, with emphasis on the space-time formulations, itSST approach the frequency of remeshing is minimized to minimize the projection errors involved in remeshing fluid-structure interaction prob- lems such as vortex-induced oscillations of a cylinder and flow past

Mittal, Sanjay

375

The Coordinated Control of a Central Air Conditioning System Based on Variable Chilled Water Temperature and Variable Chilled Water Flow  

E-Print Network [OSTI]

At present, regulation of water flow by means of pump frequency conversion is one of the major methods for power-saving in central air conditioning systems. In this article, optimization regulation for central air conditioning system on the basis...

Liu, J.; Mai, Y.; Liu, X.

2006-01-01T23:59:59.000Z

376

Compressive Sensing Based Machine Learning Strategy For Characterizing The Flow Around A Cylinder With Limited Pressure Measurements  

SciTech Connect (OSTI)

Compressive sensing is used to determine the flow characteristics around a cylinder (Reynolds number and pressure/flow field) from a sparse number of pressure measurements on the cylinder. Using a supervised machine learning strategy, library elements encoding the dimensionally reduced dynamics are computed for various Reynolds numbers. Convex L1 optimization is then used with a limited number of pressure measurements on the cylinder to reconstruct, or decode, the full pressure field and the resulting flow field around the cylinder. Aside from the highly turbulent regime (large Reynolds number) where only the Reynolds number can be identified, accurate reconstruction of the pressure field and Reynolds number is achieved. The proposed data-driven strategy thus achieves encoding of the fluid dynamics using the L2 norm, and robust decoding (flow field reconstruction) using the sparsity promoting L1 norm.

Bright, Ido; Lin, Guang; Kutz, Nathan

2013-12-05T23:59:59.000Z

377

Implementation of electric vehicle system based on solar energy in Singapore assessment of flow batteries for energy storage  

E-Print Network [OSTI]

For large-scale energy storage application, flow battery has the advantages of decoupled power and energy management, extended life cycles and relatively low cost of unit energy output ($/kWh). In this thesis, an overview ...

Chen, Yaliang

2009-01-01T23:59:59.000Z

378

SAT-based Termination Analysis for Java Bytecode with AProVE  

E-Print Network [OSTI]

SAT-based Termination Analysis for Java Bytecode with AProVE Carsten Fuhs LuFG Informatik 2, RWTH solving engines for the search problems in automated termination analysis. Consequently, the performance of current termination tools heavily relies on the speed of modern SAT solvers on the corresponding SAT

√Ābrah√°m, Erika

379

Safety analysis of software product lines using state-based modeling q , Josh Dehlinger a  

E-Print Network [OSTI]

Safety analysis of software product lines using state-based modeling q Jing Liu a , Josh Dehlinger of managing variations and their potential interactions across an entire product line currently hinders safety analysis in safety-critical, software product lines. The work described here contributes to a solution

Lutz, Robyn R.

380

ATLAS-BASED FIBER CLUSTERING FOR MULTI-SUBJECT ANALYSIS OF HIGH ANGULAR RESOLUTION DIFFUSION  

E-Print Network [OSTI]

ATLAS-BASED FIBER CLUSTERING FOR MULTI-SUBJECT ANALYSIS OF HIGH ANGULAR RESOLUTION DIFFUSION and a co-registered probabilistic DTI atlas to select key pathways, applied a threshold and median anatomy 3. Make tract analysis robust to differences in the atlas and subject 1. Image Data · 105-gradient

Thompson, Paul

Note: This page contains sample records for the topic "flow analysis base" 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

An analysis and validation pipeline for large-scale RNAi-based screens  

E-Print Network [OSTI]

An analysis and validation pipeline for large-scale RNAi-based screens Michael Plank1 , Guang Hu2 pipeline to prioritize these candidates incorporating effect sizes, functional enrichment analysis associated with oxidative stress resistance, as a proof-of-concept of our pipeline we demonstrate

de Magalh√£es, Jo√£o Pedro

382

Experimental Analysis of Task-based Energy Consumption in Cloud Computing Systems  

E-Print Network [OSTI]

computing, green cloud, energy consumption, performance analysis, energy efficiency. 1. INTRODUCTION Cloud in green cloud computing systems [4]. Many efforts have been made to improve the energy efficiency of cloudExperimental Analysis of Task-based Energy Consumption in Cloud Computing Systems Feifei Chen, John

Schneider, Jean-Guy

383

Energy analysis of substorms based on remote sensing techniques, solar wind measurements, and geomagnetic indices  

E-Print Network [OSTI]

Energy analysis of substorms based on remote sensing techniques, solar wind measurements wind Citation: √?stgaard, N., G. Germany, J. Stadsnes, and R. R. Vondrak, Energy analysis of substorms satellite have been used to examine the energy deposition in the Northern Hemisphere by precipitating

√?stgaard, Nikolai

384

Transport Analysis of Trace Tritium Experiments on JET using TRANSP Code and Comparison with Theory-Based Transport Models  

E-Print Network [OSTI]

Transport Analysis of Trace Tritium Experiments on JET using TRANSP Code and Comparison with Theory-Based Transport Models

385

SPEECH ENHANCEMENT IN CAR NOISE ENVIRONMENT BASED ON AN ANALYSIS-SYNTHESIS APPROACH USING HARMONIC NOISE MODEL  

E-Print Network [OSTI]

SPEECH ENHANCEMENT IN CAR NOISE ENVIRONMENT BASED ON AN ANALYSIS- SYNTHESIS APPROACH USING HARMONIC Kong ABSTRACT This paper presents a speech enhancement method based on an analysis-synthesis framework analysis-synthesis based speech enhancement system, and give details in HNM modeling, parameter estimation

So, Hing-Cheung

386

Development of a three-dimensional particle image velocimetry algorithm and analysis of synthetic and experimental flows in three-dimensions  

E-Print Network [OSTI]

DEVELOPMENT OF A THREE-DIMENSIONAL PARTICLE IMAGE VELOCIMETRY ALGORITHM AND ANALYSIS OF SYNTHETIC AND EXPERIMENTAL FLOWS IN THREE-DIMENSIONS A Thesis by S YLVAIN VINCENT COSTES Submitted to the Office of Graduate Studies of Texas A8t... . . . . 7 . . . . 8 . . . . 8 9 . . . . . 9 . . . 10 . 10 . . 12 13 . . . . 19 19 . . . . 19 19 . . 22 vu CHAPTER IV. B. 3. Determination of ph pih pj and prj IV. B. 4. Determination of horizontal refraction angles . . . . . IV. C...

Costes, Sylvain Vincent

2012-06-07T23:59:59.000Z

387

The Importance of Cognitive Architectures: An Analysis Based on Cognitive Science Department  

E-Print Network [OSTI]

The Importance of Cognitive Architectures: An Analysis Based on CLARION Ron Sun Cognitive Science: http://www.cogsci.rpi.edu/rsun September 15, 2006 Abstract Research in computational cognitive modeling investigates the nature of cognition through developing process-based understanding by specifying computational

Varela, Carlos

388

FP-Rank: An Effective Ranking Approach Based on Frequent Pattern Analysis  

E-Print Network [OSTI]

FP-Rank: An Effective Ranking Approach Based on Frequent Pattern Analysis Yuanfeng Song, Kenneth. Ranking documents in terms of their relevance to a given query is fundamental to many real on developing efficient ranking models. While ranking mod- els are usually trained based on given training

Ng, Wilfred Siu Hung

389

A computational analysis of the carbon-nanotube-based resonant-circuit sensors  

E-Print Network [OSTI]

A computational analysis of the carbon-nanotube-based resonant-circuit sensors M. Grujicica,* , G reduction in the resonant frequency of the resonant circuit-based chemical gas sensors. It is found of applications ranging from house gas and fire alarms to medical diagnostic applications and the control

Grujicic, Mica

390

Asymptotic analysis of utility-based prices and hedging strategies for utilities defined on the  

E-Print Network [OSTI]

Asymptotic analysis of utility-based prices and hedging strategies for utilities defined 6th 2009 #12;Outline Optimal investment and utility-based pricing hedging Asymptotic expansions horizon T 3. preferences over terminal wealth described by a utility function U #12;Trading strategies

S√ģrbu, Mihai

391

Beamforming in MISO Systems: Empirical Results and EVM-based Analysis  

E-Print Network [OSTI]

1 Beamforming in MISO Systems: Empirical Results and EVM-based Analysis Melissa Duarte, Ashutosh-based study of beamforming Multiple Input Single Output (MISO) systems. We analyze the performance of beamforming MISO systems taking into account implementation complexity and effects of imperfect channel

392

DOE'S ENERGY DATA BASE (EDB) VERSUS OTHER ENERGY-RELATED DATA BASES: A COMPARATIVE ANALYSIS  

E-Print Network [OSTI]

PLANTATIONS FIGURE 2 BIOGAS PROCESS TL'BIOGAS _ANAERQBICf o r Other Data Bases >BIOGAS/TI,DE,ID BIO(W)GAS/TI,DE,IDSEARCHES Methane (or Biogas) Production from Agricultural

Robinson, J.

2010-01-01T23:59:59.000Z

393

A Monte Carlo based spent fuel analysis safeguards strategy assessment  

SciTech Connect (OSTI)

Safeguarding nuclear material involves the detection of diversions of significant quantities of nuclear materials, and the deterrence of such diversions by the risk of early detection. There are a variety of motivations for quantifying plutonium in spent fuel assemblies by means of nondestructive assay (NDA) including the following: strengthening the capabilities of the International Atomic Energy Agencies ability to safeguards nuclear facilities, shipper/receiver difference, input accountability at reprocessing facilities and burnup credit at repositories. Many NDA techniques exist for measuring signatures from spent fuel; however, no single NDA technique can, in isolation, quantify elemental plutonium and other actinides of interest in spent fuel. A study has been undertaken to determine the best integrated combination of cost effective techniques for quantifying plutonium mass in spent fuel for nuclear safeguards. A standardized assessment process was developed to compare the effective merits and faults of 12 different detection techniques in order to integrate a few techniques and to down-select among the techniques in preparation for experiments. The process involves generating a basis burnup/enrichment/cooling time dependent spent fuel assembly library, creating diversion scenarios, developing detector models and quantifying the capability of each NDA technique. Because hundreds of input and output files must be managed in the couplings of data transitions for the different facets of the assessment process, a graphical user interface (GUI) was development that automates the process. This GUI allows users to visually create diversion scenarios with varied replacement materials, and generate a MCNPX fixed source detector assessment input file. The end result of the assembly library assessment is to select a set of common source terms and diversion scenarios for quantifying the capability of each of the 12 NDA techniques. We present here the generalized assessment process, the techniques employed to automate the coupled facets of the assessment process, and the standard burnup/enrichment/cooling time dependent spent fuel assembly library. We also clearly define the diversion scenarios that will be analyzed during the standardized assessments. Though this study is currently limited to generic PWR assemblies, it is expected that the results of the assessment will yield an adequate spent fuel analysis strategy knowledge that will help the down-select process for other reactor types.

Fensin, Michael L [Los Alamos National Laboratory; Tobin, Stephen J [Los Alamos National Laboratory; Swinhoe, Martyn T [Los Alamos National Laboratory; Menlove, Howard O [Los Alamos National Laboratory; Sandoval, Nathan P [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

394

Experimental analysis of the vorticity and turbulent flow dynamics of a pitching airfoil at realistic flight (helicopter) conditions  

E-Print Network [OSTI]

was improved understanding of the fundamental vorticity and turbulent flow physics for a dynamically stalling airfoil at realistic helicopter flight conditions. An experimental program was performed on a large-scale (C = 0.45 m) dynamically pitching NACA 0012...

Sahoo, Dipankar

2008-10-10T23:59:59.000Z

395

A Robust Four-Fluid Transient Flow Simulator as an Analysis and Decision Making Tool for Dynamic Kill Operation  

E-Print Network [OSTI]

The worst scenario of drilling operation is blowout which is uncontrolled flow of formation fluid into the wellbore. Blowouts result in environmental damage with potential risk of injuries and fatalities. Although not all blowouts result in disaster...

Haghshenas, Arash

2013-04-24T23:59:59.000Z

396

Macroalgae Analysis A National GIS-based Analysis of Macroalgae Production Potential Summary Report and Project Plan  

SciTech Connect (OSTI)

The overall project objective is to conduct a strategic analysis to assess the state of macroalgae as a feedstock for biofuels production. The objective in FY11 is to develop a multi-year systematic national assessment to evaluate the U.S. potential for macroalgae production using a GIS-based assessment tool and biophysical growth model developed as part of these activities. The initial model development for both resource assessment and constraints was completed and applied to the demonstration areas. The model for macroalgal growth was extended to the EEZ off the East and West Coasts of the United States, and a plan to merge the findings for an initial composite assessment was developed. In parallel, an assessment of land-based, port, and offshore infrastructure needs based on published and grey literature was conducted. Major information gaps and challenges encountered during this analysis were identified. Also conducted was an analysis of the type of local, state, and federal requirements that pertain to permitting land-based facilities and nearshore/offshore culture operations

Roesijadi, Guritno; Coleman, Andre M.; Judd, Chaeli; Van Cleve, Frances B.; Thom, Ronald M.; Buenau, Kate E.; Tagestad, Jerry D.; Wigmosta, Mark S.; Ward, Jeffrey A.

2011-12-01T23:59:59.000Z

397

Fault tree synthesis for software design analysis of PLC based safety-critical systems  

SciTech Connect (OSTI)

As a software verification and validation should be performed for the development of PLC based safety-critical systems, a software safety analysis is also considered in line with entire software life cycle. In this paper, we propose a technique of software safety analysis in the design phase. Among various software hazard analysis techniques, fault tree analysis is most widely used for the safety analysis of nuclear power plant systems. Fault tree analysis also has the most intuitive notation and makes both qualitative and quantitative analyses possible. To analyze the design phase more effectively, we propose a technique of fault tree synthesis, along with a universal fault tree template for the architecture modules of nuclear software. Consequently, we can analyze the safety of software on the basis of fault tree synthesis. (authors)

Koo, S. R.; Cho, C. H. [Corporate R and D Inst., Doosan Heavy Industries and Construction Co., Ltd., 39-3, Seongbok-Dong, Yongin-Si, Gyeonggi-Do 449-795 (Korea, Republic of); Seong, P. H. [Dept. of Nuclear and Quantum Engineering, Korea Advanced Inst. of Science and Technology, 373-3 Guseong-dong, Yuseong-gu, Daejeon, 305-701 (Korea, Republic of)

2006-07-01T23:59:59.000Z

398

A framework for graph-based synthesis, analysis, and visualization of HPC cluster job data.  

SciTech Connect (OSTI)

The monitoring and system analysis of high performance computing (HPC) clusters is of increasing importance to the HPC community. Analysis of HPC job data can be used to characterize system usage and diagnose and examine failure modes and their effects. This analysis is not straightforward, however, due to the complex relationships that exist between jobs. These relationships are based on a number of factors, including shared compute nodes between jobs, proximity of jobs in time, etc. Graph-based techniques represent an approach that is particularly well suited to this problem, and provide an effective technique for discovering important relationships in job queuing and execution data. The efficacy of these techniques is rooted in the use of a semantic graph as a knowledge representation tool. In a semantic graph job data, represented in a combination of numerical and textual forms, can be flexibly processed into edges, with corresponding weights, expressing relationships between jobs, nodes, users, and other relevant entities. This graph-based representation permits formal manipulation by a number of analysis algorithms. This report presents a methodology and software implementation that leverages semantic graph-based techniques for the system-level monitoring and analysis of HPC clusters based on job queuing and execution data. Ontology development and graph synthesis is discussed with respect to the domain of HPC job data. The framework developed automates the synthesis of graphs from a database of job information. It also provides a front end, enabling visualization of the synthesized graphs. Additionally, an analysis engine is incorporated that provides performance analysis, graph-based clustering, and failure prediction capabilities for HPC systems.

Mayo, Jackson R.; Kegelmeyer, W. Philip, Jr.; Wong, Matthew H.; Pebay, Philippe Pierre; Gentile, Ann C.; Thompson, David C.; Roe, Diana C.; De Sapio, Vincent; Brandt, James M.

2010-08-01T23:59:59.000Z

399

DEVELOPMENT STATUS OF A SiC-FOAM BASED FLOW CHANNEL INSERT FOR A U.S.-ITER DCLL TBM  

E-Print Network [OSTI]

, CA, 91331, U.S.A. The U.S.-ITER DCLL (Dual Coolant Liquid Lead) TBM (Test Blanket Module) uses a Flow structure. I. INTRODUCTION The U.S. ITER Double Coolant Lead Lithium (DCLL) Test Blanket Module (TBM liquid breeder (PbLi) at elevated temperatures of more than 700 o C and at low velocities of ~10 cm

Ghoniem, Nasr M.

400

Abstract--This work develops a three-phase unbalanced load flow tool tailored for radial distribution networks based  

E-Print Network [OSTI]

) generators where most of the systems are single phase. New ancillary service such as static reactive power, thermal limits of grid components and power losses in radial MV-LV networks with photovoltaic (PV support by PV inverters can be also merged together with the load flow solution tool and thus, the impact

Teodorescu, Remus

Note: This page contains sample records for the topic "flow analysis base" 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

Cotton flow  

E-Print Network [OSTI]

Using the conformally invariant Cotton tensor, we define a geometric flow, the "Cotton flow", which is exclusive to three dimensions. This flow tends to evolve the initial metrics into conformally flat ones, and is somewhat orthogonal to the Yamabe flow, the latter being a flow within a conformal class. We define an entropy functional, and study the flow of nine homogeneous spaces both numerically and analytically. In particular, we show that the arbitrarily deformed homogeneous 3-sphere flows into the round 3-sphere. Two of the nine homogeneous geometries, which are degenerated by the Ricci flow, are left intact by the Cotton flow.

Ali Ulas Ozgur Kisisel; Ozgur Sarioglu; Bayram Tekin

2008-06-17T23:59:59.000Z

402

A preliminary analysis of the reactor-based plutonium disposition alternative deployment schedules  

SciTech Connect (OSTI)

This paper discusses the preliminary analysis of the implementation schedules of the reactor-based plutonium disposition alternatives. These schedule analyses are a part of a larger process to examine the nine decision criteria used to determine the most appropriate method of disposing of U.S. surplus weapons plutonium. The preliminary analysis indicates that the mission durations for the reactor-based alternatives range from eleven years to eighteen years and the initial mission fuel assemblies containing surplus weapons-usable plutonium could be loaded into the reactors between nine and fourteen years after the Record of Decision.

Zurn, R.M.

1997-09-01T23:59:59.000Z

403

Genetic algorithm evolved agent-based equity trading using Technical Analysis and the Capital Asset Pricing Model  

E-Print Network [OSTI]

Genetic algorithm evolved agent-based equity trading using Technical Analysis and the Capital Asset data using technical analysis, the capital asset pricing model and a hybrid model of the two approaches. Results indicated that the technical analysis based approach performed better than the capital asset

Aickelin, Uwe

404

Multi-vehicle Convoy Analysis Based on ANPR data A. Homayounfar*, A. T. S. Ho*, N. Zhu*, G. Head  

E-Print Network [OSTI]

Multi-vehicle Convoy Analysis Based on ANPR data A. Homayounfar*, A. T. S. Ho*, N. Zhu*, G. Head mining techniques for convoy analysis of vehicles based on the automatic number plate recognition (ANPR of multi-vehicle convoy activities. 1 Introduction Convoy Analysis of vehicles is a relatively new research

Doran, Simon J.

405

Geothermal Resource/Reservoir Investigations Based on Heat Flow and Thermal Gradient Data for the United States  

SciTech Connect (OSTI)

Several activities related to geothermal resources in the western United States are described in this report. A database of geothermal site-specific thermal gradient and heat flow results from individual exploration wells in the western US has been assembled. Extensive temperature gradient and heat flow exploration data from the active exploration of the 1970's and 1980's were collected, compiled, and synthesized, emphasizing previously unavailable company data. Examples of the use and applications of the database are described. The database and results are available on the world wide web. In this report numerical models are used to establish basic qualitative relationships between structure, heat input, and permeability distribution, and the resulting geothermal system. A series of steady state, two-dimensional numerical models evaluate the effect of permeability and structural variations on an idealized, generic Basin and Range geothermal system and the results are described.

D. D. Blackwell; K. W. Wisian; M. C. Richards; J. L. Steele

2000-04-01T23:59:59.000Z

406

Surface Functions during Mitosis. III. Quantitative Analysis of Ligand-receptor Movement into the Cleavage Furrow: Diffusion vs. Flow  

E-Print Network [OSTI]

ABSTRACT The surface distribution of concanavalin A (Con A) bound to cell membrane receptors varies dramatically as a function of mitotic phase. The lectin is distributed diffusely on cells labeled and observed between mid-prophase and early anaphase, whereas cells observed in late anaphase or telophase demonstrate a marked accumulation of Con A-receptor complexes over the developing cleavage furrow (Berlin, Oliver, and Walter. 1978. Cell. 15:327-341). In this report, we first use a system based on video intensification fluorescence microscopy to describe the simultaneous changes in cell shape and in lectin-receptor complex topography during progression of single cells through the mitotic cycle. The video analysis establishes that fluorescein succinyl Con A (F-S Con A)-receptor complex redistribution begins coincident with the first appearance of the cleavage furrow and is essentially complete within 2-3 min. This remarkable redistribution of surface fluorescence occurs during only a modest change in cell shape from a sphere to a belted cylinder. It reflects the translocation of complexes and not the accumulation of excess labeled membrane in the cleavage furrow: first, bound fluorescent cholera toxin which faithfully outlines the plasma membrane is not accumulated in the cleavage furrow, and, second, electron microscopy of peroxidase-Con A labeled cells undergoing

unknown authors

407

Statistical Process Variation Analysis of a Graphene FET based LC-VCO for WLAN Applications  

E-Print Network [OSTI]

Statistical Process Variation Analysis of a Graphene FET based LC-VCO for WLAN Applications Md Abir.AbirKhan@my.unt.edu, saraju.mohanty@unt.edu, and elias.kougianos@unt.edu Abstract--Graphene which is a single atom layer-frequency electronics due to low Ion/Ioff ratio. In this paper, design exploration of a graphene FET (GFET) based LC

Mohanty, Saraju P.

408

A Net Energy-based Analysis for a Climate-constrained Sustainable Energy Transition  

E-Print Network [OSTI]

The transition from a fossil-based energy economy to one based on renewable energy is driven by the double challenge of climate change and resource depletion. Building a renewable energy infrastructure requires an upfront energy investment that subtracts from the net energy available to society. This investment is determined by the need to transition to renewable energy fast enough to stave off the worst consequences of climate change and, at the same time, maintain a sufficient net energy flow to sustain the world's economy and population. We show that a feasible transition pathway requires that the rate of investment in renewable energy should accelerate approximately by an order of magnitude if we are to stay within the range of IPCC recommendations.

Sgouridis, Sgouris; Csala, Denes

2015-01-01T23:59:59.000Z

409

GIS-based Multi-Criteria Analysis of Wind Farm Development Henning Sten Hansen  

E-Print Network [OSTI]

. Wind power is a popular and safe form of renewable energy, and in Europe, the demand for wind energy on the environment of traditional power- generating methods, especially coal and oil-fired power stations wind powerGIS-based Multi-Criteria Analysis of Wind Farm Development Henning Sten Hansen National

Hansen, René Rydhof

410

Enabling access-privacy for random walk based data analysis applications q  

E-Print Network [OSTI]

of the future states depend only on the present. A Markov chain is a discrete-time stochastic process which. In this paper, we focus on access-privacy enabled outsourced Markov chain based data analysis applications This submission is an extended version of Ping Lin, K. Selc¬łuk Candan: Access-private outsourcing of Markov chain

Candan, Selçuk

411

IEEE TRANSACTIONS ON POWER SYSTEMS 1 Web-based Security Cost Analysis in Electricity  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON POWER SYSTEMS 1 Web-based Security Cost Analysis in Electricity Markets Hong of transmission security constraints, transactions de- termined by market forces are feasible only when they are within the system's security limits. Thus, transactions in electricity markets need to be evaluated

Ca√Īizares, Claudio A.

412

Query-driven Analysis of Plasma-based Particle Acceleration Data Oliver Rubel  

E-Print Network [OSTI]

Query-driven Analysis of Plasma-based Particle Acceleration Data Oliver R¨ubel LBNL Cameron G. R. Geddes LBNL Min Chen LBNL Estelle Cormier-Michel Tech-X Corp. E. W. Bethel LBNL x(x106 ) 2000 4000

413

On a tensor-based finite element model for the analysis of shell structures  

E-Print Network [OSTI]

In the present study, we propose a computational model for the linear and nonlinear analysis of shell structures. We consider a tensor-based finite element formulation which describes the mathematical shell model in a natural and simple way by using...

Arciniega Aleman, Roman Augusto

2006-04-12T23:59:59.000Z

414

A Simple Fuzzy Classifier based on Inconsistency Analysis of Labeled Data  

E-Print Network [OSTI]

for designing fuzzy systems for prediction, control, and pattern recognition. Most of these data 2000, fuzzy classifier, model initialisation, direct mail INRODUCTION Data mining and knowledgeA Simple Fuzzy Classifier based on Inconsistency Analysis of Labeled Data J√°nos Abonyi, Hans Roubos

Putten, Peter van der

415

Surface Analysis by Highly Charged Ion Based Secondary Ion Mass Spectrometry  

E-Print Network [OSTI]

Surface Analysis by Highly Charged Ion Based Secondary Ion Mass Spectrometry T. Schenkel,1 A high vacuum (10^8 torr). In posi- tive polarity, HCI can be decelerated to an impact energy of $1 ke in the interaction of slow (u highly charged ions (e.g., Au69+ ) with solid surfaces increases secondary

416

AN APPROACH FOR INTERSUBJECT ANALYSIS OF 3D BRAIN IMAGES BASED ON CONFORMAL GEOMETRY  

E-Print Network [OSTI]

AN APPROACH FOR INTERSUBJECT ANALYSIS OF 3D BRAIN IMAGES BASED ON CONFORMAL GEOMETRY Guangyu Zou Emission Tomography (PET) and Diffusion Tensor Imaging (DTI) have accelerated brain research in many aspects. In order to better understand the synergy of the many processes involved in normal brain function

Hua, Jing

417

A Simple Biomass-Based Length-Cohort Analysis for Estimating Biomass and Fishing Mortality  

E-Print Network [OSTI]

F was also examined. Results of the analysis showed that the allometric power coefficient b for northern rock sole Lepidopsetta polyxystra in the eastern Bering Sea. A comparison of biomass-based LCA population biomass estimates with northern rock sole research survey biomass estimates showed good agreement

418

A Quality Based Approach for the Analysis and Design of Business Process Models  

E-Print Network [OSTI]

A Quality Based Approach for the Analysis and Design of Business Process Models Sarah Ayad1 CEDRIC in modeling and improving Business Process (BP) models quality. This problem is of growing interest exploiting domain knowledge. Keywords-component: Business Process Models, Quality metrics, Quality

Paris-Sud XI, Université de

419

Current-based 4D shape analysis for the mechanical personalization of heart models  

E-Print Network [OSTI]

Current-based 4D shape analysis for the mechanical personalization of heart models Lo¨ic Le Folgoc1. Abstract. Patient-specific models of the heart may lead to better understanding of cardiovascular diseases-mechanical model of the heart, from the kinematics of the endo- and epicardium, is presented in this paper. We use

Paris-Sud XI, Université de

420

Integrated Analysis for the Design of Reusable TPS based on Variable Transpiration Cooling for Hypersonic Cruise  

E-Print Network [OSTI]

with the high dynamic pressure flight trajectories, generates surface temperatures for which the strength1 Integrated Analysis for the Design of Reusable TPS based on Variable Transpiration Cooling of hypersonic air-breathing vehicles presents formidable challenges. Reusable thermal protection systems (TPS

Texas at Arlington, University of

Note: This page contains sample records for the topic "flow analysis base" 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

3D-mesh models: view-based indexing and structural analysis  

E-Print Network [OSTI]

3D-mesh models: view-based indexing and structural analysis Mohamed Daoudi, Tarik Filali Ansary.daoudi@lifl.fr, tarik.filali@lifl.fr, julien.tierny@lifl.fr, jean-philippe.vandeborre@lifl.fr Abstract. 3D-mesh models applications, medical or military simulations, video games and so on. Indexing and analyzing these 3D data

Paris-Sud XI, Université de

422

Mauve: a Component-based Modeling Framework for Real-time Analysis of Robotic Applications  

E-Print Network [OSTI]

Mauve: a Component-based Modeling Framework for Real-time Analysis of Robotic Applications Charles paradigm for robotic software devel- opment [2], applied in many applications [3], [4], [5], [6]. Resulting validation of the robotic application, by directly analysing the architecture specification, and limiting

423

Thermodynamic Cycle Analysis for Wave Rotor Combustor Based Combined Cycle Jessica Collins1  

E-Print Network [OSTI]

Thermodynamic Cycle Analysis for Wave Rotor Combustor Based Combined Cycle Jessica Collins1 , Brian of Engineering and Technology The conventional combustor that exists in today's market is a constant pressure device; whereas, the wave rotor combustor investigated in the present research is a constant volume

Zhou, Yaoqi

424

Simulator Generation Using an Automaton Based Pipeline Model for Timing Analysis  

E-Print Network [OSTI]

Simulator Generation Using an Automaton Based Pipeline Model for Timing Analysis Rola Kassem, Mika the description of the pipeline. The description is transformed into an automaton and a set of resources which. The blocks communicate and synchronise with each other in order to handle the pipeline hazards. A pipeline

Paris-Sud XI, Université de

425

Geosynthetics International, 2004, 11, No. 3 Reliability-based stability analysis considering  

E-Print Network [OSTI]

of uncertainty in geosynthetic clay liner (GCL) shear strength on landfill stability is evaluated in this studyGeosynthetics International, 2004, 11, No. 3 Reliability-based stability analysis considering GCL to safety factors typically used in geotechnical practice. KEYWORDS: Geosynthetics, Design, GCL internal

Zornberg, Jorge G.

426

NONLINEAR ANALYSIS OF RUBBER-BASED POLYMERIC MATERIALS WITH THERMAL RELAXATION MODELS  

E-Print Network [OSTI]

NONLINEAR ANALYSIS OF RUBBER-BASED POLYMERIC MATERIALS WITH THERMAL RELAXATION MODELS R. V. N of the material and their close connection with the effect of thermal relaxation time can be best appreciated (phonons). A relaxation time appears naturally as the characteristic of thermal resistance in the solid

Melnik, Roderick

427

Towards QoS Prediction Based on Composition Structure Analysis and Probabilistic Environment Models  

E-Print Network [OSTI]

Towards QoS Prediction Based on Composition Structure Analysis and Probabilistic Environment Models Dragan Ivanovi¬īc Universidad Polit¬īecnica de Madrid idragan@clip.dia.fi.upm.es Peerachai Kaowichakorn Universidad Polit¬īecnica de Madrid p.kaowichakorn@gmail.com Manuel Carro Universidad Polit¬īecnica de Madrid

Politécnica de Madrid, Universidad

428

A phylogenetic analysis of the emberizid sparrows based on three mitochondrial genes  

E-Print Network [OSTI]

A phylogenetic analysis of the emberizid sparrows based on three mitochondrial genes Rebecca J phylogenetic studies have examined the taxonomic relationships among a number of typical emberizid sparrow The phylogenetic relationships within the family Emberizidae have presented avian systematists with a taxonomic

Spicer, Greg S.

429

Bayes Linear Uncertainty Analysis for Oil Reservoirs Based on Multiscale Computer Experiments  

E-Print Network [OSTI]

Bayes Linear Uncertainty Analysis for Oil Reservoirs Based on Multiscale Computer Experiments, 2008 1 Introduction Reservoir simulators are important and widely-used tools for oil reservoir for reservoirs, where the model inputs are physical parameters, such as the permeability and porosity of various

Oakley, Jeremy

430

Model-based Failure Modes and Effects Analysis of Neal Snooke 1  

E-Print Network [OSTI]

embedded software developers who are already familiar with the benefits of FMEA analysis. Several au- thors discuss experiences of performing manual FMEA of software however there has been no attempt at automating of software and the success of model based automated FMEA for hardware. 1 Introduction The notion of Software

Snooke, Neal

431

An Automated Failure Modes and Effect Analysis Based Visual Matrix Approach to Sensor Selection and  

E-Print Network [OSTI]

- prehensive automated Failure Modes and Effects Analysis (FMEA) using qualitative model based reasoning techniques. The automated FMEA pro- vides a comprehensive set of fault≠effect rela- tions by qualitative FMEA results in a fault-effect mapping that can be used to investi- gate the diagnosability

Snooke, Neal

432

A Wavelet Theory -Based Adaptive Trend Analysis System for Process Monitoring and Diagnosis  

E-Print Network [OSTI]

A Wavelet Theory - Based Adaptive Trend Analysis System for Process Monitoring and Diagnosis Hiranmayee Vedam Venkat Venkatasubramanian* Laboratory for Intelligent Process Systems School of Chemical-ASTRA performs process monitoring and diagnosis. The main contributions of this paper are two fold. A wavelet

Venkatasubramanian, Venkat

433

TANK MIXING STUDY WITH FLOW RECIRCULATION  

SciTech Connect (OSTI)

The primary objective of this work is to quantify the mixing time when two miscible fluids are mixed by one recirculation pump and to evaluate adequacy of 2.5 hours of pump recirculation to be considered well mixed in SRS tanks, JT-71/72. The work scope described here consists of two modeling analyses. They are the steady state flow pattern analysis during pump recirculation operation of the tank liquid and transient species transport calculations based on the initial steady state flow patterns. The modeling calculations for the mixing time are performed by using the 99% homogeneity criterion for the entire domain of the tank contents.

Lee, S.

2014-06-25T23:59:59.000Z

434

Reactive Power Compensation Based on FACTs Devices Xunchi Wu (xw2256) Power Systems Analysis Final Project  

E-Print Network [OSTI]

..........................................................................................5 2.1 The Thyristor Controlled Reactor (TCR)......................................................................8 III. Power Flow Calculation

Lavaei, Javad

435

Security Analysis of Selected AMI Failure Scenarios Using Agent Based Game Theoretic Simulation  

SciTech Connect (OSTI)

Information security analysis can be performed using game theory implemented in dynamic Agent Based Game Theoretic (ABGT) simulations. Such simulations can be verified with the results from game theory analysis and further used to explore larger scale, real world scenarios involving multiple attackers, defenders, and information assets. We concentrated our analysis on the Advanced Metering Infrastructure (AMI) functional domain which the National Electric Sector Cyber security Organization Resource (NESCOR) working group has currently documented 29 failure scenarios. The strategy for the game was developed by analyzing five electric sector representative failure scenarios contained in the AMI functional domain. From these five selected scenarios, we characterize them into three specific threat categories affecting confidentiality, integrity and availability (CIA). The analysis using our ABGT simulation demonstrates how to model the AMI functional domain using a set of rationalized game theoretic rules decomposed from the failure scenarios in terms of how those scenarios might impact the AMI network with respect to CIA.

Abercrombie, Robert K [ORNL] [ORNL; Schlicher, Bob G [ORNL] [ORNL; Sheldon, Frederick T [ORNL] [ORNL

2014-01-01T23:59:59.000Z

436

Reservoir characterization based on tracer response and rank analysis of production and injection rates  

SciTech Connect (OSTI)

Quantification of the spatial distribution of properties is important for many reservoir-engineering applications. But, before applying any reservoir-characterization technique, the type of problem to be tackled and the information available should be analyzed. This is important because difficulties arise in reservoirs where production records are the only information for analysis. This paper presents the results of a practical technique to determine preferential flow trends in a reservoir. The technique is a combination of reservoir geology, tracer data, and Spearman rank correlation coefficient analysis. The Spearman analysis, in particular, will prove to be important because it appears to be insightful and uses injection/production data that are prevalent in circumstances where other data are nonexistent. The technique is applied to the North Buck Draw field, Campbell County, Wyoming. This work provides guidelines to assess information about reservoir continuity in interwell regions from widely available measurements of production and injection rates at existing wells. The information gained from the application of this technique can contribute to both the daily reservoir management and the future design, control, and interpretation of subsequent projects in the reservoir, without the need for additional data.

Refunjol, B.T. [Lagoven, S.A., Pdvsa (Venezuela); Lake, L.W. [Univ. of Texas, Austin, TX (United States)

1997-08-01T23:59:59.000Z

437

Handbook of methods for risk-based analysis of Technical Specification requirements  

SciTech Connect (OSTI)

Technical Specifications (TS) requirements for nuclear power plants define the Limiting Conditions for Operation (LCOs) and Surveillance Requirements (SRs) to assure safety during operation. In general, these requirements were based on deterministic analysis and engineering judgments. Experiences with plant operation indicate that some elements of the requirements are unnecessarily restrictive, while others may not be conducive to safety. Improvements in these requirements are facilitated by the availability of plant specific Probabilistic Safety Assessments (PSAs). The use of risk and reliability-based methods to improve TS requirements has gained wide interest because these methods can: quantitatively evaluate the risk impact and justify changes based on objective risk arguments. Provide a defensible basis for these requirements for regulatory applications. The United States Nuclear Regulatory Commission (USNRC) Office of Research is sponsoring research to develop systematic risk-based methods to improve various aspects of TS requirements. The handbook of methods, which is being prepared, summarizes such risk-based methods. The scope of the handbook includes reliability and risk-based methods for evaluating allowed outage times (AOTs), action statements requiring shutdown where shutdown risk may be substantial, surveillance test intervals (STIs), defenses against common-cause failures, managing plant configurations, and scheduling maintenances. For each topic, the handbook summarizes methods of analysis and data needs, outlines the insights to be gained, lists additional references, and presents examples of evaluations.

Samanta, P.K.; Vesely, W.E.

1993-12-31T23:59:59.000Z

438

Model-Based Analysis of the Role of Biological, Hydrological and Geochemical Factors Affecting Uranium Bioremediation  

SciTech Connect (OSTI)

Uranium contamination is a serious concern at several sites motivating the development of novel treatment strategies such as the Geobacter-mediated reductive immobilization of uranium. However, this bioremediation strategy has not yet been optimized for the sustained uranium removal. While several reactive-transport models have been developed to represent Geobacter-mediated bioremediation of uranium, these models often lack the detailed quantitative description of the microbial process (e.g., biomass build-up in both groundwater and sediments, electron transport system, etc.) and the interaction between biogeochemical and hydrological process. In this study, a novel multi-scale model was developed by integrating our recent model on electron capacitance of Geobacter (Zhao et al., 2010) with a comprehensive simulator of coupled fluid flow, hydrologic transport, heat transfer, and biogeochemical reactions. This mechanistic reactive-transport model accurately reproduces the experimental data for the bioremediation of uranium with acetate amendment. We subsequently performed global sensitivity analysis with the reactive-transport model in order to identify the main sources of prediction uncertainty caused by synergistic effects of biological, geochemical, and hydrological processes. The proposed approach successfully captured significant contributing factors across time and space, thereby improving the structure and parameterization of the comprehensive reactive-transport model. The global sensitivity analysis also provides a potentially useful tool to evaluate uranium bioremediation strategy. The simulations suggest that under difficult environments (e.g., highly contaminated with U(VI) at a high migration rate of solutes), the efficiency of uranium removal can be improved by adding Geobacter species to the contaminated site (bioaugmentation) in conjunction with the addition of electron donor (biostimulation). The simulations also highlight the interactive effect of initial cell concentration and flow rate on U(VI) reduction.

Zhao, Jiao; Scheibe, Timothy D.; Mahadevan, Radhakrishnan

2011-01-24T23:59:59.000Z

439

Comparative analysis of energy data bases for the industrial and commercial sectors  

SciTech Connect (OSTI)

Energy data bases for the industrial and commercial sectors were analyzed to determine how valuable this data might be for policy analysis. The approach is the same for both end-use sectors: first a descrption or overview of relevant data bases identifies the available data; the coverage and methods used to generate the data are then explained; the data are then characterized and examples are provided for the major data sets under consideration. A final step assesses the data bases under consideration and draws conclusions. There are a variety of data bases considered for each of the end-use sectors included in this report. Data bases for the industrial sector include the National Energy Accounts, process-derived data bases such as the Drexel data base and data obtained from industry trade associations. For the commercial sector, three types of data bases are analyzed: the Nonresidential Building Energy Consumption Surveys, Dodge Construction Data and the Building Owners and Manager's Association Experience Exchange Report.

Roop, J.M.; Belzer, D.B.; Bohn, A.A.

1986-12-01T23:59:59.000Z

440

A Simulator with Numerical Upscaling for the Analysis of Coupled Multiphase Flow and Geomechanics in Heterogeneous and Deformable Porous and Fractured Media  

E-Print Network [OSTI]

multi-dimensional rock deformation. A coupled flow and geomechanics model considers flow physics and rock physics simultaneously by cou-pling different types of partial differential equations through primary variables. A number of coupled flow...

Yang, Daegil

2013-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

TYBO/BENHAM: Model Analysis of Groundwater Flow and Radionuclide Migration from Underground Nuclear Tests in Southwestern Pahute Mesa, Nevada  

SciTech Connect (OSTI)

Recent field studies have led to the discovery of trace quantities of plutonium originating from the BENHAM underground nuclear test in two groundwater observation wells on Pahute Mesa at the Nevada Test Site. These observation wells are located 1.3 km from the BENHAM underground nuclear test and approximately 300 m from the TYBO underground nuclear test. In addition to plutonium, several other conservative (e.g. tritium) and reactive (e.g. cesium) radionuclides were found in both observation wells. The highest radionuclide concentrations were found in a well sampling a welded tuff aquifer more than 500m above the BENHAM emplacement depth. These measurements have prompted additional investigations to ascertain the mechanisms, processes, and conditions affecting subsurface radionuclide transport in Pahute Mesa groundwater. This report describes an integrated modeling approach used to simulate groundwater flow, radionuclide source release, and radionuclide transport near the BENHAM and TYBO underground nuclear tests on Pahute Mesa. The components of the model include a flow model at a scale large enough to encompass many wells for calibration, a source-term model capable of predicting radionuclide releases to aquifers following complex processes associated with nonisothermal flow and glass dissolution, and site-scale transport models that consider migration of solutes and colloids in fractured volcanic rock. Although multiple modeling components contribute to the methodology presented in this report, they are coupled and yield results consistent with laboratory and field observations. Additionally, sensitivity analyses are conducted to provide insight into the relative importance of uncertainty ranges in the transport parameters.

Andrew Wolfsberg; Lee Glascoe; Guoping Lu; Alyssa; Olson; Peter Lichtner; Maureen McGraw; Terry Cherry; ,; Guy Roemer

2002-09-01T23:59:59.000Z

442

Analysis of long-term flows resulting from large-scale sodium-water reactions in an LMFBR secondary system  

SciTech Connect (OSTI)

Leaks in LMFBR steam generators cannot entirely be prevented; thus the steam generators and the intermediate heat transport system (IHTS) of an LMFBR must be designed to withstand the effects of the leaks. A large-scale leak which might result from a sudden break of a steam generator tube, and the resulting sodium-water reaction (SWR) can generate large pressure pulses that propagate through the IHTS and exert large forces on the piping supports. This paper discusses computer programs for analyzing long-term flow and thermal effects in an LMFBR secondary system resulting from large-scale steam generator leaks, and the status of the development of the codes.

Shin, Y.W.; Chung, H.; Choi, U.S.; Wiedermann, A.H.; Ockert, C.E.

1984-07-01T23:59:59.000Z

443

Preliminary analysis of the possibility of making use of part of the energy flow of zero-point radiation  

E-Print Network [OSTI]

The energy flow of zero-point radiation is very great, but difficult to put to use. However, the observations made by Sparnaay in 1958 and by Lamoureux in 1997 reveal the possibility of making use of a very small fraction of that immense amount. This possibility is big enough for such a minute fraction to have significant importance, but such a possibility requires miniaturisation to a degree which may be unattainable. It is worth trying to achieve it, since it would open the way to interstellar travel.

R. Alvargonzalez; L. S. Soto

2008-03-07T23:59:59.000Z

444

Subcooled flow boiling heat transfer and critical heat flux in water-based nanofluids at low pressure  

E-Print Network [OSTI]

A nanofluid is a colloidal suspension of nano-scale particles in water, or other base fluids. Previous pool boiling studies have shown that nanofluids can improve the critical heat flux (CHF) by as much as 200%. In this ...

Kim, Sung Joong, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

445

A Knowledge-Based Approach for Power-Plant Availability Analysis  

E-Print Network [OSTI]

, this is a very powerful approach. When common- mode failures are to be included, this approach is not valid and the transition rate matrix approach needs to be used. C. GO Block Logic System The GO Availability Analysis Methodology was developed by EPRI... in Fig. 14. is based upon one of the designs developed by EPRI to aid in the evaluation of the economic benefits of potential improvements in advanced gas turbine reliaibility. The failure snd repair rates are based on previous historic data. Both...

Reddy, A. Chandra Shekar

1988-01-01T23:59:59.000Z

446

Approach to proliferation risk assessment based on multiple objective analysis framework  

SciTech Connect (OSTI)

The approach to the assessment of proliferation risk using the methods of multi-criteria decision making and multi-objective optimization is presented. The approach allows the taking into account of the specifics features of the national nuclear infrastructure, and possible proliferation strategies (motivations, intentions, and capabilities). 3 examples of applying the approach are shown. First, the approach has been used to evaluate the attractiveness of HEU (high enriched uranium)production scenarios at a clandestine enrichment facility using centrifuge enrichment technology. Secondly, the approach has been applied to assess the attractiveness of scenarios for undeclared production of plutonium or HEU by theft of materials circulating in nuclear fuel cycle facilities and thermal reactors. Thirdly, the approach has been used to perform a comparative analysis of the structures of developing nuclear power systems based on different types of nuclear fuel cycles, the analysis being based on indicators of proliferation risk.

Andrianov, A.; Kuptsov, I. [Obninsk Institute for Nuclear Power Engineering of NNRU MEPhI (Russian Federation); Studgorodok 1, Obninsk, Kaluga region, 249030 (Russian Federation)

2013-07-01T23:59:59.000Z

447

PWR FLECHT SEASET 21-rod-bundle flow-blockage task: data and analysis report. NRC/EPRI/Westinghouse report No. 11, main report and appendices A-J  

SciTech Connect (OSTI)

This report presents data and limited analysis from the 21-Rod Bundle Flow Blockage Task of the Full-Length Emergency Cooling Heat Transfer Separate Effects and Systems Effects Test Program (FLECHT SEASET). The tests consisted of forced and gravity reflooding tests utilizing electrical heater rods with a cosine axial power profile to simulate PWR nuclear core fuel rod arrays. Steam cooling and hydraulic characteristics tests were also conducted. These tests were utilized to determine effects of various flow blockage configurations (shapes and distributions) on reflooding behavior, to aid in development/assessment of computational models in predicting reflooding behavior of flow blockage configurations, and to screen flow blockage configurations for future 163-rod flow blockage bundle tests.

Loftus, M.J.; Hochreiter, L.E.; Lee, N.; McGuire, M.F.; Wenzel, A.H.; Valkovic, M.M.

1982-09-01T23:59:59.000Z

448

The buffer management scheme for the new Triumf VAX-based data acquisition and analysis system  

SciTech Connect (OSTI)

The new TRIUMF VAX-based DAAS requires data to be exchanged between acquisition, monitoring and analysis processes executing on a VAX. Data records are passed via a set of buffers contained in a region of memory shared by all processes. The responsibility for buffer management is distributed among the processes and synchronized access to the region is achieved by using the VAX self-relative queue instructions and common event flags.

Ludgate, G.A.; Haley, B.; Lee, L.

1987-08-01T23:59:59.000Z

449

Analysis of a quantum memory for photons based on controlled reversible inhomogeneous broadening  

E-Print Network [OSTI]

We present a detailed analysis of a quantum memory for photons based on controlled and reversible inhomogeneous broadening (CRIB). The explicit solution of the equations of motion is obtained in the weak excitation regime, making it possible to gain insight into the dependence of the memory efficiency on the optical depth, and on the width and shape of the atomic spectral distributions. We also study a simplified memory protocol which does not require any optical control fields.

Nicolas Sangouard; Christoph Simon; Mikael Afzelius; Nicolas Gisin

2007-01-30T23:59:59.000Z

450

FPGA Based Real-time Network Traffic Analysis using Traffic Dispersion Patterns  

SciTech Connect (OSTI)

The problem of Network Traffic Classification (NTC) has attracted significant amount of interest in the research community, offering a wide range of solutions at various levels. The core challenge is in addressing high amounts of traffic diversity found in today's networks. The problem becomes more challenging if a quick detection is required as in the case of identifying malicious network behavior or new applications like peer-to-peer traffic that have potential to quickly throttle the network bandwidth or cause significant damage. Recently, Traffic Dispersion Graphs (TDGs) have been introduced as a viable candidate for NTC. The TDGs work by forming a network wide communication graphs that embed characteristic patterns of underlying network applications. However, these patterns need to be quickly evaluated for mounting real-time response against them. This paper addresses these concerns and presents a novel solution for real-time analysis of Traffic Dispersion Metrics (TDMs) in the TDGs. We evaluate the dispersion metrics of interest and present a dedicated solution on an FPGA for their analysis. We also present analytical measures and empirically evaluate operating effectiveness of our design. The mapped design on Virtex-5 device can process 7.4 million packets/second for a TDG comprising of 10k flows at very high accuracies of over 96%.

Khan, F; Gokhale, M; Chuah, C N

2010-03-26T23:59:59.000Z

451

Simultaneous solution algorithms for Eulerian-Eulerian gas-solid flow models: Stability analysis and convergence behaviour of a point and a plane solver  

SciTech Connect (OSTI)

Simultaneous solution algorithms for Eulerian-Eulerian gas-solid flow models are presented and their stability analyzed. The integration algorithms are based on dual-time stepping with fourth-order Runge-Kutta in pseudo-time. The domain is solved point or plane wise. The discretization of the inviscid terms is based on a low-Mach limit of the multi-phase preconditioned advection upstream splitting method (MP-AUSMP). The numerical stability of the simultaneous solution algorithms is analyzed in 2D with the Fourier method. Stability results are compared with the convergence behaviour of 3D riser simulations. The impact of the grid aspect ratio, preconditioning, artificial dissipation, and the treatment of the source terms is investigated. A particular advantage of the simultaneous solution algorithms is that they allow a fully implicit treatment of the source terms which are of crucial importance for the Eulerian-Eulerian gas-solid flow models and their solution. The numerical stability of the optimal simultaneous solution algorithm is analyzed for different solids volume fractions and gas-solid slip velocities. Furthermore, the effect of the grid resolution on the convergence behaviour and the simulation results is investigated. Finally, simulations of the bottom zone of a pilot-scale riser with a side solids inlet are experimentally validated.

Wilde, Juray de [Laboratorium voor Petrochemische Techniek, Ghent University, Krijgslaan 281, Blok S5, B-9000 Ghent (Belgium) and Fluid Mechanics Laboratory, Department of Fluid, Heat and Combustion Mechanics, Ghent University, St.-Pietersnieuwstraat 41, B-9000 Ghent (Belgium)]. E-mail: Guray.Marin@UGent.be; Vierendeels, Jan [Fluid Mechanics Laboratory, Department of Fluid, Heat and Combustion Mechanics, Ghent University, St.-Pietersnieuwstraat 41, B-9000 Ghent (Belgium); Heynderickx, Geraldine J. [Laboratorium voor Petrochemische Techniek, Ghent University, Krijgslaan 281, Blok S5, B-9000 Ghent (Belgium); Marin, Guy B. [Laboratorium voor Petrochemische Techniek, Ghent University, Krijgslaan 281, Blok S5, B-9000 Ghent (Belgium)

2005-07-20T23:59:59.000Z

452

Simscape Design Flow for Memristor Based Programmable Oscillators Ebubechukwu Agu, Saraju P. Mohanty, Elias Kougianos, Mahesh Gautam  

E-Print Network [OSTI]

Results The GSA algorithm is applied to the Simscape Model. The algorithm is ran for 1000 iteration to achieve the optimal power consumption. As presented in the Table below, the power consumption is reduced-based oscillator optimization with GSA Experimental setup in simscape (b) I-V characteristics for various input

Mohanty, Saraju P.

453

Analysis of loss-of-flow transients in a pool-type LMFBR using SSC-P  

SciTech Connect (OSTI)

In order to have a general analytical capability for the safety evaluation of any proposed LMFBR system, the USNRC is sponsoring the development and validation of computer codes for both pool- and loop-type plants. The computer code for pool-type LMFBRs is designated SSC-P. This paper is concerned with the application of SSC-P to simulate loss-of-flow accident transients in a pool-type LMFBR. The models required for dynamic plant simulation are briefly highlighted. The system response is calculated for (1) a complete loss of electric power event, with scram, leading the plant into buoyancy-induced natural circulation, (2) a protected pipe rupture accident in the primary pump discharge line, and (3) an unprotected loss of off-site power event. For the last case, the predicted results from SSC-P are compared with the published results of Phenix behavior by NOVATOME.

Madni, I.K.; Cazzoli, E.G.

1982-01-01T23:59:59.000Z

454

Nonpremixed Combustion in an Accelerating Turning Transonic Flow Undergoing Transition  

E-Print Network [OSTI]

the turbine-blade material limit. Sirignano and Liu [1,2] show by thermodynamic analysis that the thrust and to widen the range of engine operation. Because the flow in a turbine passage is accelerating and power consumption by intentionally burning fuel in the turbine stages. For the ground-based gas turbine, improvement

Liu, Feng

455

AN AGGREGATIONBASED DOMAIN DECOMPOSITION PRECONDITIONER FOR GROUNDWATER FLOW \\Lambda  

E-Print Network [OSTI]

the standard finite element framework from [18,24]. The preconditioner also works well in the context of finiteAN AGGREGATION­BASED DOMAIN DECOMPOSITION PRECONDITIONER FOR GROUNDWATER FLOW \\Lambda E. W. JENKINS analysis of a two­level additive Schwarz method in which the coarse mesh basis is constructed

456

Beamforming in MISO Systems: Empirical Results and EVM-based Analysis  

E-Print Network [OSTI]

We present an analytical, simulation, and experimental-based study of beamforming Multiple Input Single Output (MISO) systems. We analyze the performance of beamforming MISO systems taking into account implementation complexity and effects of imperfect channel estimate, delayed feedback, real Radio Frequency (RF) hardware, and imperfect timing synchronization. Our results show that efficient implementation of codebook-based beamforming MISO systems with good performance is feasible in the presence of channel and implementation-induced imperfections. As part of our study we develop a framework for Average Error Vector Magnitude Squared (AEVMS)-based analysis of beamforming MISO systems which facilitates comparison of analytical, simulation, and experimental results on the same scale. In addition, AEVMS allows fair comparison of experimental results obtained from different wireless testbeds. We derive novel expressions for the AEVMS of beamforming MISO systems and show how the AEVMS relates to important system ...

Duarte, Melissa; Dick, Chris; Rao, Raghu

2009-01-01T23:59:59.000Z

457

Numerical simulation of electrokinetically driven micro flows  

E-Print Network [OSTI]

Spectral element based numerical solvers are developed to simulate electrokinetically driven flows for micro-fluidic applications. Based on these numerical solvers, basic phenomena and devices for electrokinetic applications in micro and nano flows...

Hahm, Jungyoon

2005-11-01T23:59:59.000Z

458

Modeling and analysis framework for core damage propagation during flow-blockage-initiated accidents in the Advanced Neutron Source reactor at Oak Ridge National Laboratory  

SciTech Connect (OSTI)

This paper describes modeling and analysis to evaluate the extent of core damage during flow blockage events in the Advanced Neutron Source (ANS) reactor planned to be built at ORNL. Damage propagation is postulated to occur from thermal conduction between dmaged and undamaged plates due to direct thermal contact. Such direct thermal contact may occur beause of fuel plate swelling during fission product vapor release or plate buckling. Complex phenomena of damage propagation were modeled using a one-dimensional heat transfer model. A parametric study was done for several uncertain variables. The study included investigating effects of plate contact area, convective heat transfer coefficient, thermal conductivity on fuel swelling, and initial temperature of the plate being contacted by the damaged plate. Also, the side support plates were modeled to account for their effects of damage propagation. Results provide useful insights into how variouss uncertain parameters affect damage propagation.

Kim, S.H.; Taleyarkhan, R.P.; Navarro-Valenti, S.; Georgevich, V.

1995-12-31T23:59:59.000Z

459

Automatic screening of obstructive sleep apnea from the ECG based on empirical mode decomposition and wavelet analysis  

E-Print Network [OSTI]

Automatic screening of obstructive sleep apnea from the ECG based on empirical mode decomposition apnea from the ECG based on empirical mode decomposition and wavelet analysis M O Mendez1,2 , J Corthout different methods to detect obstructive sleep apnea (OSA) during sleep time based only on the ECG signal

460

Adapting a GIS-Based Multicriteria Decision Analysis Approach for Evaluating New Power Generating Sites  

SciTech Connect (OSTI)

There is a growing need to site new power generating plants that use cleaner energy sources due to increased regulations on air and water pollution and a sociopolitical desire to develop more clean energy sources. To assist utility and energy companies as well as policy-makers in evaluating potential areas for siting new plants in the contiguous United States, a geographic information system (GIS)-based multicriteria decision analysis approach is presented in this paper. The presented approach has led to the development of the Oak Ridge Siting Analysis for power Generation Expansion (OR-SAGE) tool. The tool takes inputs such as population growth, water availability, environmental indicators, and tectonic and geological hazards to provide an in-depth analysis for siting options. To the utility and energy companies, the tool can quickly and effectively provide feedback on land suitability based on technology specific inputs. However, the tool does not replace the required detailed evaluation of candidate sites. To the policy-makers, the tool provides the ability to analyze the impacts of future energy technology while balancing competing resource use.

Omitaomu, Olufemi A [ORNL; Blevins, Brandon R [ORNL; Jochem, Warren C [ORNL; Mays, Gary T [ORNL; Belles, Randy [ORNL; Hadley, Stanton W [ORNL; Harrison, Thomas J [ORNL; Bhaduri, Budhendra L [ORNL; Neish, Bradley S [ORNL; Rose, Amy N [ORNL

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

Transient growth mechanisms of low Reynolds number flow over a low-pressure turbine blade  

E-Print Network [OSTI]

A direct transient growth analysis for three-dimensional perturbations to flow past a periodic array of T-106/300 low-pressure turbine fan blades is presented. The methodology is based on a singular value decomposition of the flow evolution operator, linearised about a steady or periodic base flow. This analysis yields the optimal growth modes. Previous work on global mode stability analysis of this flow geometry showed the flow is asymptotically stable, indicating a non-modal explanation of transition may be more appropriate. The present work extends previous investigations into the transient growth around a steady base flow, to higher Reynolds numbers and periodic base flows. It is found that the notable transient growth of the optimal modes suggests a plausible route to transition in comparison to modal growth for this configuration. The spatial extent and localisation of the optimal modes is examined and possible physical triggering mechanisms are discussed. It is found that for longer times and longer sp...

Sharma, AS; Sherwin, SJ; Theofilis, V; 10.1007/s00162-010-0183-9

2013-01-01T23:59:59.000Z

462

Ninja data analysis with a detection pipeline based on the Hilbert-Huang Transform  

E-Print Network [OSTI]

The Ninja data analysis challenge allowed the study of the sensitivity of data analysis pipelines to binary black hole numerical relativity waveforms in simulated Gaussian noise at the design level of the LIGO observatory and the VIRGO observatory. We analyzed NINJA data with a pipeline based on the Hilbert Huang Transform, utilizing a detection stage and a characterization stage: detection is performed by triggering on excess instantaneous power, characterization is performed by displaying the kernel density enhanced (KD) time-frequency trace of the signal. Using the simulated data based on the two LIGO detectors, we were able to detect 77 signals out of 126 above SNR 5 in coincidence, with 43 missed events characterized by signal to noise ratio SNR less than 10. Characterization of the detected signals revealed the merger part of the waveform in high time and frequency resolution, free from time-frequency uncertainty. We estimated the timelag of the signals between the detectors based on the optimal overlap of the individual KD time-frequency maps, yielding estimates accurate within a fraction of a millisecond for half of the events. A coherent addition of the data sets according to the estimated timelag eventually was used in a characterization of the event.

Alexander Stroeer; Jordan Camp

2009-03-11T23:59:59.000Z

463

Parametric analysis of radiative-convective heat transfer around a circular cylinder in a cross flow using the finite volume radiation solution method  

SciTech Connect (OSTI)

In the outside vapor deposition (OVD) process, silica particles are deposited by thermophoretic force on the surface of a cylinder. This process is associated with complex physical phenomena such as heat transfer between a torch and a cylinder, chemical reaction for silica particle formation, and particle deposition. Since the OVD process is carried out in a very high temperature environment, radiative heat transfer should be taken into consideration. Here, the radiative-convective heat transfer around a circular cylinder in a cross flow of a radiating gas has been numerically analyzed using the finite volume radiation solution method in a nonorthogonal coordinate system. The cross-flow Reynolds number based on the cylinder diameter is 40, and the fluid Prandtl number is assumed to be 0.7. The radiative heat transfer coupled with convection is reasonably predicted by the finite volume radiation solution method. Distributions of the local Nusselt number are investigated according to the variation of radiation parameters such as conduction-to-radiation parameter, optical thickness, scattering albedo, and cylinder wall emissivity.

Lee, K.H.; Lee, J.S.; Choi, M. [Seoul National Univ. (Korea, Republic of). Dept. of Mechanical Engineering

1996-02-09T23:59:59.000Z

464

Traffic Analysis of UDP-based Flows in Ourmon Portland State University -Computer Science Technical Report -0807  

E-Print Network [OSTI]

with them denial-of-service attacks, scans, spam and keylogging are rife [6, 8]. In addition, the relatively

Binkley, Jim

465

Simulation and physical model based gamma-ray burst afterglow analysis  

E-Print Network [OSTI]

Advances in our numerical and theoretical understanding of gamma-ray burst afterglow processes allow us to construct models capable of dealing with complex relativistic jet dynamics and non-thermal emission, that can be compared directly to data from instruments such as Swift. Because afterglow blast waves and power law spectra are intrinsically scale-invariant under changes of explosion energy and medium density, templates can be generated from large-scale hydrodynamics simulations. This allows for iterative template-based model fitting using the physical model parameters (quantifying the properties of the burster, emission and observer) directly as fit variables. Here I review how such an approach to afterglow analysis works in practice, paying special attention to the underlying model assumptions, possibilities, caveats and limitations of this type of analysis. Because some model parameters can be degenerate in certain regions of parameter space, or unconstrained if data in a limited number of a bands is a...

van Eerten, Hendrik

2015-01-01T23:59:59.000Z

466

Fuel Cycle Analysis Framework Base Cases for the IAEA/INPRO GAINS Collaborative Project  

SciTech Connect (OSTI)

Thirteen countries participated in the Collaborative Project GAINS ďGlobal Architecture of Innovative Nuclear Energy Systems Based on Thermal and Fast Reactors Including a Closed Fuel CycleĒ, which was the primary activity within the IAEA/INPRO Program Area B: ďGlobal Vision on Sustainable Nuclear EnergyĒ for the last three years. The overall objective of GAINS was to develop a standard framework for assessing future nuclear energy systems taking into account sustainable development, and to validate results through sample analyses. This paper details the eight scenarios that constitute the GAINS framework base cases for analysis of the transition to future innovative nuclear energy systems. The framework base cases provide a reference for users of the framework to start from in developing and assessing their own alternate systems. Each base case is described along with performance results against the GAINS sustainability evaluation metrics. The eight cases include four using a moderate growth projection and four using a high growth projection for global nuclear electricity generation through 2100. The cases are divided into two sets, addressing homogeneous and heterogeneous scenarios developed by GAINS to model global fuel cycle strategies. The heterogeneous world scenario considers three separate nuclear groups based on their fuel cycle strategies, with non-synergistic and synergistic cases. The framework base case analyses results show the impact of these different fuel cycle strategies while providing references for future users of the GAINS framework. A large number of scenario alterations are possible and can be used to assess different strategies, different technologies, and different assumptions about possible futures of nuclear power. Results can be compared to the framework base cases to assess where these alternate cases perform differently versus the sustainability indicators.

Brent Dixon

2012-09-01T23:59:59.000Z

467

PC's as graphics stations for the new Triumf VAX-based data acquisition and analysis system  

SciTech Connect (OSTI)

The requirements of fast graphics display and low impact on the data acquisition and analysis system (DAAS) VAX host prompted TRIUMF to adopt PC's on an ethernet as graphics workstations for the new VAX-based DAAS. This multiprocessor solution provides for high speed host to workstation data transfer for image display, and independence of the host's CPU loading for the provision of advanced graphics services such as image storage, replotting, image-data transformations, peak fitting, statistics calculations, comparison of stored images etc.

Ludgate, G.A.; Haley, B.; Lee, L.

1987-08-01T23:59:59.000Z

468

Genetic Algorithms for Agent-Based Infrastructure Interdependency Modeling and Analysis  

SciTech Connect (OSTI)

Todayís society relies greatly upon an array of complex national and international infrastructure networks such as transportation, electric power, telecommunication, and financial networks. This paper describes initial research combining agent-based infrastructure modeling software and genetic algorithms (GAs) to help optimize infrastructure protection and restoration decisions. This research proposes to apply GAs to the problem of infrastructure modeling and analysis in order to determine the optimum assets to restore or protect from attack or other disaster. This research is just commencing and therefore the focus of this paper is the integration of a GA optimization method with a simulation through the simulationís agents.

May Permann

2007-03-01T23:59:59.000Z

469

Economic Analysis for Conceptual Design of Oxygen-Based PC Boiler  

SciTech Connect (OSTI)

The objective of the economic analysis is to prepare a budgetary estimate of capital and operating costs of the O{sub 2}-fired PC power plant as well as for the equivalent conventional PC-fired power plant. Capital and operating costs of conventional steam generation, steam heating, and power generation equipment are estimated based on Foster Wheeler's extensive experience and database. Capital and operating costs of equipment, such as oxygen separation and CO{sub 2} liquefaction, are based on vendor supplied data and FW process plant experience. The levelized cost of electricity is determined for both the air-fired and O{sub 2}-fired power plants as well as the CO{sub 2} mitigation cost. An economic comparison between the O{sub 2}-fired PC and other alternate technologies is presented.

Andrew Seltzer

2005-02-01T23:59:59.000Z

470

Environmental analysis of an Eastern U. S. oil shale hydroretorting data base  

SciTech Connect (OSTI)

This paper summarizes the results of a preliminary environmental analysis of the HYTORT data base on eastern oil shale which identifies the potential types and quantities of pollutants emanating directly from hydroretorting. Trace constituents in the product gas and retort sour water are identified and the distribution of raw shale sulfur and nitrogen in the retorting products is determined. Bench scale unit runs performed in a recent HYTORT feasibility study form the data base primarily used for this study. The bench scale unit runs are a comprehensive series of tests which were designed to optimize the operating conditions on Indiana New Albany shale. The results of this study provide an indication of the pollutants which may potentially be produced during commercial operation of a HYTORT plant utilizing eastern oil shale, and subsequently, the types of control technologies which would be necessary.

Rex, R.C.; Lynch, P.A.; Hartstein, A.M.

1985-01-01T23:59:59.000Z

471

Flow chamber  

DOE Patents [OSTI]

A flow chamber having a vacuum chamber and a specimen chamber. The specimen chamber may have an opening through which a fluid may be introduced and an opening through which the fluid may exit. The vacuum chamber may have an opening through which contents of the vacuum chamber may be evacuated. A portion of the flow chamber may be flexible, and a vacuum may be used to hold the components of the flow chamber together.

Morozov, Victor (Manassas, VA)

2011-01-18T23:59:59.000Z

472

TRAC-PF1/MOD-1 analysis of Loss-Of-Flow Test L9-4  

SciTech Connect (OSTI)

Los Alamos National Laboratory is developing the Transient Reactor Analysis Code (TRAC) to provide advanced best-estimate predictions of postulated accidents in pressurized water reactors (PWRs) and for many thermal-hydraulic experimental facilities. As part of our independent assessment of code version TRAC-PF1/MOD1, we analyzed Loss-of-Fluid Test (LOFT) L9-4 and compared the test data to the calculated results. This was an anticipated-transient-without-scram test in which the pumps were tripped, the steam generator main feedwater discontinued, and the main steam-outlet valve closed. This data comparison is the first extensive test of TRAC's reactor-kinetics models. The comparisons show that TRAC can calculate the power generation within a nuclear reactor if the program is supplied with adequate reactor-kinetics input specifications. The data comparisons also indicate that TRAC calculated the thermal-hydraulic parameters within LOFT well with only minor discrepancies. A number of models within TRAC-PF1/MOD1 were verified for the first time. They include the reactor-kinetics models, the trip-activated time-step controls, and the LOFT pump-coastdown calculations. In general, the final input description is adequate to analyze the experiment. The calculations indicate the importance and difficulty of obtaining accurate and applicable reactor-kinetics input data. They also indicate the need to include the effects of xenon-poisoning buildup in the analysis.

Meier, J.

1985-01-01T23:59:59.000Z

473

Strategic backdrop analysis for fossil fuel planning. Task 2 report (New Task Series), The Base Case. Report 473-117-08/01  

SciTech Connect (OSTI)

This report describes a base case analysis performed using the strategic backdrop analytical framework developed by The Futures Group to facilitate fossil fuel planning within the Department of Energy. It builds upon the data base compiled in the default case previously submitted but uses a different set of energy technology assumptions. Objectives of the strategic backdrop analysis project are: (1) to delineate alternative socioeconomic futures or target worlds for the United States and to derive, for each world, the amount of energy needed to sustain its level of economic activity and lifestyle, assuming no technological changes; (2) to construct an analytical framework that accounts for the flow of energy from the disaggregated end-use target demand sectors back through the distribution and conversion processes to primary resource requirements; (3) to use this framework 1) to analyze how alternative government policies and associated new technologies can change the primary resource needs and fuel mix while still providing the same level of end-use energy service for the target world, and 2) to highlight resource constraints, program inconsistencies, and economic, environmental, and social implications; (4) to transfer to DOE personnel the methodology for generating energy targets and accounting for important characteristics of alternative energy policies and technologies.

Not Available

1980-08-01T23:59:59.000Z

474

Geological flows  

E-Print Network [OSTI]

In this paper geology and planetology are considered using new conceptual basis of high-speed flow dynamics. Recent photo technics allow to see all details of a flow, 'cause the flow is static during very short time interval. On the other hand, maps and images of many planets are accessible. Identity of geological flows and high-speed gas dynamics is demonstrated. There is another time scale, and no more. All results, as far as the concept, are new and belong to the author. No formulae, pictures only.

Yu. N. Bratkov

2008-11-19T23:59:59.000Z

475

Radionuclide Sensors for Environmental Monitoring: From Flow...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

to Equilibration-Based Radionuclide Sensors for Environmental Monitoring: From Flow Injection Solid-Phase Absorptiometry to Equilibration-Based Abstract: The development...

476

Over-allocation or abatement? : a preliminary analysis of the EU ETS based on the 2005 emission data  

E-Print Network [OSTI]

This paper provides an initial analysis of the EU ETS based on the installation-level data for verified emissions and allowance allocations in the first trading year. Those data, released on May 15, 2006, and subsequent ...

Ellerman, A. Denny

2006-01-01T23:59:59.000Z

477

Over-Allocation or Abatement? A Preliminary Analysis of the EU Emissions Trading Scheme Based on the 2005 Emissions Data  

E-Print Network [OSTI]

This paper provides an initial analysis of the European Union Emissions Trading Scheme (EU ETS) based on the installation-level data for verified emissions and allowance allocations in the first trading year. Those data, ...

Ellerman, A. Denny.

478

The effects of cold water injection and two-phase flow on skin factor and permeability estimates from pressure falloff analysis  

E-Print Network [OSTI]

33 54 78 LIST OF TABLES Tabl e Data for Bottomhole Temperature Calculation Reservoir and Thermal Properties for Model Verification Page 34 35 Water and Oil Viscosities for Model Verification . . 36 10 12 13 14 15 Water and Oil... Relative Permeabilities for Model Verification Data for Single-Phase Flow Runs Low Oil Viscosity for Single-Phase Flow Runs High Oil Viscosity for Single-Phase Flow Runs Data for Two-Phase Flow Runs Sumaary of Numerical Simulation Runs Results...

Linge, Frode

1984-01-01T23:59:59.000Z

479

Mobility analysis tool based on the fundamental principle of conservation of energy.  

SciTech Connect (OSTI)

In the past decade, a great deal of effort has been focused in research and development of versatile robotic ground vehicles without understanding their performance in a particular operating environment. As the usage of robotic ground vehicles for intelligence applications increases, understanding mobility of the vehicles becomes critical to increase the probability of their successful operations. This paper describes a framework based on conservation of energy to predict the maximum mobility of robotic ground vehicles over general terrain. The basis of the prediction is the difference between traction capability and energy loss at the vehicle-terrain interface. The mission success of a robotic ground vehicle is primarily a function of mobility. Mobility of a vehicle is defined as the overall capability of a vehicle to move from place to place while retaining its ability to perform its primary mission. A mobility analysis tool based on the fundamental principle of conservation of energy is described in this document. The tool is a graphical user interface application. The mobility analysis tool has been developed at Sandia National Laboratories, Albuquerque, NM. The tool is at an initial stage of development. In the future, the tool will be expanded to include all vehicles and terrain types.

Spletzer, Barry Louis; Nho, Hyuchul C.; Salton, Jonathan Robert

2007-08-01T23:59:59.000Z

480

Application of direct-fitting, mass-integral, and multi-ratemethods to analysis of flowing fluid electric conductivity logs fromHoronobe, Japan  

SciTech Connect (OSTI)

The flowing fluid electric conductivity (FFEC) loggingmethod is an efficient way to provide information on the depths,salinities, and transmissivities of individual conductive featuresintercepted by a borehole, without the use of specialized probes. Usingit in a multiple-flow-rate mode allows, in addition, an estimate of theinherent "far-field" pressure heads in each of the conductive features.The multi-rate method was successfully applied to a 500-m borehole in agranitic formation and reported recently. The present paper presents theapplication of the method to two zones within a 1000-m borehole insedimentary rock, which produced, for each zone, three sets of logs atdifferent pumping rates, each set measured over a period of about oneday. The data sets involve a number of complications, such as variablewell diameter, free water table decline in the well, and effects ofdrilling mud. To analyze data from this borehole, we apply varioustechniques that have been developed for analyzing FFEC logs:direct-fitting, mass-integral, and the multi-rate method mentioned above.In spite of complications associated with the tests, analysis of the datais able to identify 44 hydraulically conducting fractures distributedover the depth interval 150-775 meters below ground surface. Thesalinities (in FEC), and transmissivities and pressure heads (indimensionless form) of these 44 features are obtained and found to varysignificantly among one another. These results are compared with datafrom eight packer tests with packer intervals of 10-80 m, which wereconducted in this borehole over the same depth interval. They are foundto be consistent with these independent packer-test data, thusdemonstrating the robustness of the FFEC logging method under non-idealconditions.

Doughty, C.; Tsang, C.-F.; Hatanaka, K.; Yabuuchi, S.; Kurikami, H.

2007-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "flow analysis base" 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

AN IN-DEPTH STUDY OF GRID-BASED ASTEROSEISMIC ANALYSIS  

SciTech Connect (OSTI)

NASA's Kepler mission is providing basic asteroseismic data for hundreds of stars. One of the more common ways of determining stellar characteristics from these data is by the so-called grid-based modeling. We have made a detailed study of grid-based analysis techniques to study the errors (and error correlations) involved. As had been reported earlier, we find that it is relatively easy to get very precise values of stellar radii using grid-based techniques. However, we find that there are small, but significant, biases that can result because of the grid of models used. The biases can be minimized if metallicity is known. Masses cannot be determined as precisely as the radii and suffer from larger systematic effects. We also find that the errors in mass and radius are correlated. A positive consequence of this correlation is that log g can be determined both precisely and accurately with almost no systematic biases. Radii and log g can be determined with almost no model dependence to within 5% for realistic estimates of errors in asteroseismic and conventional observations. Errors in mass can be somewhat higher unless accurate metallicity estimates are available. Age estimates of individual stars are the most model dependent. The errors are larger, too. However, we find that for star clusters, it is possible to get a relatively precise age if one assumes that all stars in a given cluster have the same age.

Gai Ning [Department of Astronomy, Beijing Normal University, Beijing 100875 (China); Basu, Sarbani [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Chaplin, William J.; Elsworth, Yvonne, E-mail: gaining@mail.bnu.edu.cn, E-mail: sarbani.basu@yale.edu, E-mail: w.j.chaplin@bham.ac.uk, E-mail: y.p.elsworth@bham.ac.uk [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom)

2011-04-01T23:59:59.000Z

482

Distributed Energy Resources at Naval Base Ventura County Building1512: A Sensitivity Analysis  

SciTech Connect (OSTI)

This report is the second of a two-part study by BerkeleyLab of a DER (distributed energy resources) system at Navy Base VenturaCounty (NBVC). First, a preliminary assessment ofthe cost effectivenessof distributed energy resources at Naval Base Ventura County (NBVC)Building 1512 was conducted in response to the base s request for designassistance to the Federal Energy Management Program (Bailey and Marnay,2004). That report contains a detailed description of the site and theDER-CAM (Consumer Adoption Model) parameters used. This second reportcontains sensitivity analyses of key parameters in the DER system modelof Building 1512 at NBVC and additionally considers the potential forabsorption-powered refrigeration.The prior analysis found that under thecurrent tariffs, and given assumptions about the performance andstructure of building energy loads and available generating technologycharacteristics, installing a 600 kW DER system with absorption coolingand recovery heat capabilities could deliver cost savings of about 14percent, worth $55,000 per year. However, under current conditions, thisstudy also suggested that significant savings could be obtained ifBuilding 1512 changed from its current direct access contract to a SCETOU-8 (Southern California Edison time of use tariff number 8) ratewithout installing a DER system. Evaluated on this tariff, the potentialsavings from installation of a DER system would be about 4 percent of thetotal bill, or $16,000 per year.

Bailey, Owen C.; Marnay, Chris

2005-06-05T23:59:59.000Z

483

UZ Flow Models and Submodels  

SciTech Connect (OSTI)

The purpose of this report is to document the unsaturated zone (UZ) flow models and submodels, as well as the flow fields that have been generated using the UZ flow model(s) of Yucca Mountain, Nevada. In this report, the term ''UZ model'' refers to the UZ flow model and the several submodels, which include tracer transport, temperature or ambient geothermal, pneumatic or gas flow, and geochemistry (chloride, calcite, and strontium) submodels. The term UZ flow model refers to the three-dimensional models used for calibration and simulation of UZ flow fields. This work was planned in the ''Technical Work Plan (TWP) for: Unsaturated Zone Flow Analysis and Model Report Integration'' (BSC 2004 [DIRS 169654], Section 1.2.7). The table of included Features, Events, and Processes (FEPs), Table 6.2-11, is different from the list of included FEPs assigned to this report in the ''Technical Work Plan for: Unsaturated Zone Flow Analysis and Model Report Integration'' (BSC 2004 [DIRS 169654], Table 2.1.5-1), as discussed in Section 6.2.6. The UZ model has revised, updated, and enhanced the previous UZ model (BSC 2001 [DIRS 158726]) by incorporating the repository design with new grids, recalibration of property sets, and more comprehensive validation effort. The flow fields describe fracture-fracture, matrix-matrix, and fracture-matrix liquid flow rates, and their spatial distributions as well as moisture conditions in the UZ system. These three-dimensional UZ flow fields are used directly by Total System Performance Assessment (TSPA). The model and submodels evaluate important hydrogeologic processes in the UZ as well as geochemistry and geothermal conditions. These provide the necessary framework to test hypotheses of flow and transport at different scales, and predict flow and transport behavior under a variety of climatic conditions. In addition, the limitations of the UZ model are discussed in Section 8.11.

Y. Wu

2004-11-01T23:59:59.000Z

484

Parameter Estimation and Capacity Fade Analysis of Lithium-Ion Batteries Using First-Principles-Based Efficient Reformulated Models  

E-Print Network [OSTI]

Parameter Estimation and Capacity Fade Analysis of Lithium-Ion Batteries Using First parameters of lithium-ion batteries are estimated using a first-principles electrochemical engineering model and understanding of lithium-ion batteries using physics-based first-principles models. These models are based

Subramanian, Venkat

485

Induction Motor Fault Diagnosis Using a Hilbert-Park Lissajou's Curve Analysis and Neural Network-Based Decision  

E-Print Network [OSTI]

and condition-based maintenance to be arranged for the electrical machines during scheduled downtimes of inherent failures are due to the mechanical or electrical forces acting in the machine enclosure propose an original fault signature based on the Hilbert-Park Lissajou's curve analysis. The performances

Paris-Sud XI, Université de

486

Analysis of the Christensen et al. Clauser-Horne (CH)-Inequality-Based Test of Local Realism  

E-Print Network [OSTI]

The Clauser-Horne (CH) inequality can validly test aspects of locality when properly applied. This paper analyzes a recent CH-based EPRB experiment, the Christensen et al. experiment. Full details of the data analysis applied to the experiment are given. It is shown that the experiment confirms locality and disconfirms the quantum joint prediction. Additionally, the paper contributes to promulgation of robust and correct data analysis by describing the important degrees of freedom that affect the analysis, and that must be addressed in the analysis of any experiment.

Donald A. Graft

2015-01-03T23:59:59.000Z

487

Williston Basin: An analysis of salt drilling techniques for brine-based drilling-fluid systems  

SciTech Connect (OSTI)

Williston Basin salt intervals, ranging in depth from 5,000 to 12,500 ft (1525 to 3810 m), have been responsible for widespread casing collapse because of the plastic movement of evaporites and the subsequent point loading of casing. This phenomenon is attributable to poor cement jobs across excessively eroded salt sections. A 2-year study led to the realization that this erosion is a function of not only salt dissolution but also the mechanical action of turbulent flow in the wellbore. A laminar flow regime can be realized and salt enlargement limited by careful control of annular flow rate, jet velocity, and drilling-fluid rheology.

Stash, S.M.; Jones, M.E.

1988-03-01T23:59:59.000Z

488

Mechanical design of flow batteries  

E-Print Network [OSTI]

The purpose of this research is to investigate the design of low-cost, high-efficiency flow batteries. Researchers are searching for next-generation battery materials, and this thesis presents a systems analysis encompassing ...

Hopkins, Brandon J. (Brandon James)

2013-01-01T23:59:59.000Z

489

Convergence analysis of a CMFD method based on generalized equivalence theory  

SciTech Connect (OSTI)

CMFD acceleration methods have been successful in reducing the computational burden for steady-state and transient reactor calculations. However, recent work on a complex coupled code BWR ATWS event has exposed possible issues with the stability of the CMFD method when standard CMFD methods are used. During the simulation of the ATWS boron injection event in the BWR, the PARCS code failed to converge with the existing CMFD method. A new CMFD method based on generalized equivalence theory was developed and the PARCS solution converged for the same ATWS event. This paper presents the new method and a detailed analytic and numerical convergence analysis. The results show that the new CMFD converges for all possible cross sections combinations anticipated in Light Water Reactor simulation and unlike existing CMFD methods, it is very robust even when the initial guess is far from final true solution. (authors)

Xu, Y. [Argonne National Laboratory, Bldg. 208, 9700 South Case Ave., Argonne, IL 60439 (United States); Downar, T. [Dept. of Nuclear Engineering and Radiological Sciences, Univ. of Michigan, 2355 Bonisteel Blvd, Ann Arbor, MI 48109-2104 (United States)

2012-07-01T23:59:59.000Z

490

Cut set-based risk and reliability analysis for arbitrarily interconnected networks  

DOE Patents [OSTI]

Method for computing all-terminal reliability for arbitrarily interconnected networks such as the United States public switched telephone network. The method includes an efficient search algorithm to generate minimal cut sets for nonhierarchical networks directly from the network connectivity diagram. Efficiency of the search algorithm stems in part from its basis on only link failures. The method also includes a novel quantification scheme that likewise reduces computational effort associated with assessing network reliability based on traditional risk importance measures. Vast reductions in computational effort are realized since combinatorial expansion and subsequent Boolean reduction steps are eliminated through analysis of network segmentations using a technique of assuming node failures to occur on only one side of a break in the network, and repeating the technique for all minimal cut sets generated with the search algorithm. The method functions equally well for planar and non-planar networks.

Wyss, Gregory D. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

491

Analysis of a Quantum Nondemolition Measurement Scheme Based on Kerr Nonlinearity in Photonic Crystal Waveguides  

E-Print Network [OSTI]

We discuss the feasibility of a quantum nondemolition measurement (QND) of photon number based on cross phase modulation due to the Kerr effect in Photonic Crystal Waveguides (PCWs). In particular, we derive the equations for two modes propagating in PCWs and their coupling by a third order nonlinearity. The reduced group velocity and small cross-sectional area of the PCW lead to an enhancement of the interaction relative to bulk materials. We show that in principle, such experiments may be feasible with current photonic technologies, although they are limited by material properties. Our analysis of the propagation equations is sufficiently general to be applicable to the study of soliton formation, all-optical switching and can be extended to processes involving other orders of the nonlinearity.

Ilya Fushman; Jelena Vuckovic

2006-03-16T23:59:59.000Z

492

Modeling and analysis framework for core damage propagation during flow-blockage-initiated accidents in the Advanced Neutron Source Reactor at Oak Ridge National Laboratory  

SciTech Connect (OSTI)

This paper describes modeling and analysis to evaluate the extent of core damage during flow blockage events in the Advanced Neutron Source (ANS) reactor planned to be built at the Oak Ridge National Laboratory (ORNL). Damage propagation is postulated to occur from thermal conduction between damaged and undamaged plates due to direct thermal contact. Such direct thermal contact may occur because of fuel plate swelling during fission product vapor release or plate buckling. Complex phenomena of damage propagation were modeled using a one-dimensional heat transfer model. A scoping study was conducted to learn what parameters are important for core damage propagation, and to obtain initial estimates of core melt mass for addressing recriticality and steam explosion events. The study included investigating the effects of the plate contact area, the convective heat transfer coefficient, thermal conductivity upon fuel swelling, and the initial temperature of the plate being contacted by the damaged plate. Also, the side support plates were modeled to account for their effects on damage propagation. The results provide useful insights into how various uncertain parameters affect damage propagation.

Kim, S.H.; Taleyarkhan, R.P.; Navarro-Valenti, S.; Georgevich, V.

1995-09-01T23:59:59.000Z

493

Model-Based Analysis of Electric Drive Options for Medium-Duty Parcel Delivery Vehicles: Preprint  

SciTech Connect (OSTI)

Medium-duty vehicles are used in a broad array of fleet applications, including parcel delivery. These vehicles are excellent candidates for electric drive applications due to their transient-intensive duty cycles, operation in densely populated areas, and relatively high fuel consumption and emissions. The National Renewable Energy Laboratory (NREL) conducted a robust assessment of parcel delivery routes and completed a model-based techno-economic analysis of hybrid electric vehicle (HEV) and plug-in hybrid electric vehicle configurations. First, NREL characterized parcel delivery vehicle usage patterns, most notably daily distance driven and drive cycle intensity. Second, drive-cycle analysis results framed the selection of drive cycles used to test a parcel delivery HEV on a chassis dynamometer. Next, measured fuel consumption results were used to validate simulated fuel consumption values derived from a dynamic model of the parcel delivery vehicle. Finally, NREL swept a matrix of 120 component size, usage, and cost combinations to assess impacts on fuel consumption and vehicle cost. The results illustrated the dependency of component sizing on drive-cycle intensity and daily distance driven and may allow parcel delivery fleets to match the most appropriate electric drive vehicle to their fleet usage profile.

Barnitt, R. A.; Brooker, A. D.; Ramroth, L.

2010-12-01T23:59:59.000Z

494

Cooling Flows or Heating Flows?  

E-Print Network [OSTI]

It is now clear that AGN heat cooling flows, largely by driving winds. The winds may contain a relativistic component that generates powerful synchrotron radiation, but it is not clear that all winds do so. The spatial and temporal stability of the AGN/cooling flow interaction are discussed. Collimation of the winds probably provides spatial stability. Temporal stability may be possible only for black holes with masses above a critical value. Both the failure of cooling flows to have adiabatic cores and the existence of X-ray cavities confirm the importance of collimated outflows. I quantify the scale of the convective flow that the AGN Hydra would need to drive if it balanced radiative inward flow by outward flow parallel to the jets. At least in Virgo any such flow must be confined to r<~20 kpc. Hydrodynamical simulations suggest that AGN outbursts cannot last longer than ~25 Myr. Data for four clusters with well studied X-ray cavities suggests that heating associated with cavity formation approximately balances radiative cooling. The role of cosmic infall and the mechanism of filament formation are briefly touched on.

James Binney

2003-10-08T23:59:59.000Z

495

Functional-analysis based tool for testing quark-hadron duality  

E-Print Network [OSTI]

Quark-hadron duality is a key concept in QCD, allowing for the description of physical hadronic observables in terms of quark-gluon degrees of freedom. The modern theoretical framework for its implementation is Wilson's operator product expansion (OPE), supplemented by analytic extrapolation from large Euclidean momenta, where the OPE is defined, to the Minkowski axis, where observable quantities are defined. Recently, the importance of additional terms in the expansion of QCD correlators near the Minkowski axis, responsible for quark-hadron duality violations (DVs), was emphasized. In this paper we introduce a mathematical tool that might be useful for the study of DVs in QCD. It is based on finding the minimal distance, measured in the $L^\\infty$ norm along a contour in the complex momentum plane, between a class of admissible functions containing the physical amplitude and the asymptotic expansion predicted by the OPE. This minimal distance is given by the norm of a Hankel matrix that can be calculated exactly, using as input the experimental spectral function on a finite interval of the timelike axis. We also comment on the relation between the new functional tool and the more commonly used $\\chi^2$-based analysis. The approach is illustrated on a toy model for the QCD polarization function recently proposed in the literature.

Irinel Caprini; Maarten Golterman; Santiago Peris

2014-07-09T23:59:59.000Z

496

Knowledge-based analysis of microarray gene expression data by using support vector machines  

SciTech Connect (OSTI)

The authors introduce a method of functionally classifying genes by using gene expression data from DNA microarray hybridization experiments. The method is based on the theory of support vector machines (SVMs). SVMs are considered a supervised computer learning method because they exploit prior knowledge of gene function to identify unknown genes of similar function from expression data. SVMs avoid several problems associated with unsupervised clustering methods, such as hierarchical clustering and self-organizing maps. SVMs have many mathematical features that make them attractive for gene expression analysis, including their flexibility in choosing a similarity function, sparseness of solution when dealing with large data sets, the ability to handle large feature spaces, and the ability to identify outliers. They test several SVMs that use different similarity metrics, as well as some other supervised learning methods, and find that the SVMs best identify sets of genes with a common function using expression data. Finally, they use SVMs to predict functional roles for uncharacterized yeast ORFs based on their expression data.

William Grundy; Manuel Ares, Jr.; David Haussler

2001-06-18T23:59:59.000Z

497

Economic analysis of coal-fired cogeneration plants for Air Force bases  

SciTech Connect (OSTI)

The Defense Appropriations Act of 1986 requires the Department of Defense to use an additional 1,600,000 tons/year of coal at their US facilities by 1995 and also states that the most economical fuel should be used at each facility. In a previous study of Air Force heating plants burning gas or oil, Oak Ridge National Laboratory found that only a small fraction of this target 1,600,000 tons/year could be achieved by converting the plants where coal is economically viable. To identify projects that would use greater amounts of coal, the economic benefits of installing coal-fired cogeneration plants at 7 candidate Air Force bases were examined in this study. A life-cycle cost analysis was performed that included two types of financing (Air Force and private) and three levels of energy escalation for a total of six economic scenarios. Hill, McGuire, and Plattsburgh Air Force Bases were identified as the facilities with the best potential for coal-fired cogeneration, but the actual cost savings will depend strongly on how the projects are financed and to a lesser extent on future energy escalation rates. 10 refs., 11 figs., 27 tabs.

Holcomb, R.S.; Griffin, F.P.

1990-10-01T23:59:59.000Z