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


1

Multinational Firms and Heterogeneous Labor  

E-Print Network (OSTI)

In the presence of increasing specialization of workers it becomes more and more difficult for firms to find the most suitable ones. In such an environment a multinational enterprise (MNE) has an advantage because it can exchange workers between plants in different countries. Recruiting from the home and foreign plant leads to a larger labor market pool for an MNE, reducing the mismatch of its workforce. This paper analyzes the consequences of this advantage for production, employment, prices and wages. We find that the additional ability to recruit workers from the home and foreign labor market leads to lower mismatch, higher average productivity of workers, lower prices, higher output, and higher employment of a plant of an MNE as compared to a national firm, while the wage-effects depend on firm productivity. These facts are well in line with recent empirical findings.

Mario Larch; Wolfgang Lechthaler; Mario Larch; Wolfgang Lechthaler

2008-01-01T23:59:59.000Z

2

Productivity and the Sourcing Modes of Multinational Firms: Evidence from French Firm-Level Data  

E-Print Network (OSTI)

We investigate the role of a firm’s total factor productivity in its decision to import from its affiliates rather than from independent input suppliers. We propose a slightly modified version of the Antràs and Helpman (2004) model. We assume higher fixed costs under outsourcing and a firm-specific production function. We use detailed French firm-level data that provides a geographical breakdown of French firms ’ import at product level and their sourcing modes in 1999. We find strong empirical support for the theoretical predictions of the model. In particular, high-productivity firms that have a production process intensive in suppliers’ inputs, source their inputs through independent foreign suppliers.

Fabrice Defever; Farid Toubal

2007-01-01T23:59:59.000Z

3

Productivity and the Sourcing Modes of Multinational Firms: Evidence from French Firm-Level Data ?  

E-Print Network (OSTI)

We investigate the role of firm’s total factor productivity in its decision to import from their affiliates rather than from independent input suppliers. We propose a slightly modified version of the Antràs and Helpman (2004) model. We assume higher fixed costs under outsourcing and a firm-specific production function. We use detailed French firm-level data that provides a geographical breakdown of French firms ’ import at product level and their sourcing modes in 1999. We find strong empirical support for the theoretical predictions of the model. In particular, high-productivity firms that have a production process intensive in suppliers ’ inputs source their inputs through independent foreign suppliers.

Fabrice Defever A; Farid Toubal B; Gianmarco Ottaviano; Frédéric Robert-nicoud; Jean-marc Siroen For

2007-01-01T23:59:59.000Z

4

Firm Level Investment in France and the United States: An Exploration of What We Have Learned in Twenty Years  

E-Print Network (OSTI)

and that their capital intensity has increased between thethis aggregate level. The capital intensity for firms in the

Hall, Bronwyn H.; Mairesse, Jacques; Mulkay, Benoit

1998-01-01T23:59:59.000Z

5

Financial Fragility, Heterogeneous Firms and the Cross Section of the Business Cycle  

E-Print Network (OSTI)

, which captures uncertainty regarding relative prices. Uncertainty arises because ?rms are price takers and there is a one-period lag between when ?rms borrow on the credit market, hire workers and production takes place, and when they sell their output... . Firms are unable to raise external ?nance on the stock market because of equity rationing (Greenwald et al. (1984) and Myers and Majluf (1984)). Therefore, they rely on internally generated funds as the primary source of funding and resort to bank credit...

Holly, Sean; Santoro, E

6

Productivity and Performance Effects of Business Process Reengineering: A Firm-Level Analysis  

Science Conference Proceedings (OSTI)

We empirically investigate whether business process reengineering (BPR), which requires substantial investment in information technology to integrate separate tasks into complete cross-functional processes, is associated with enhanced firm productivity ... Keywords: Business Process Reengineering, Business Value Of Information Technology, Panel Regression, Productivity

Kemal Altinkemer; Yasin Ozcelik; Zafer Ozdemir

2011-04-01T23:59:59.000Z

7

Molecular-Level Design of Heterogeneous Chiral Catalysis  

SciTech Connect

The following is a proposal to continue our multi-institutional research on heterogeneous chiral catalysis. Our team combines the use of surface-sensitive analytical techniques for the characterization of model systems with quantum and statistical mechanical calculations to interpret experimental data and guide the design of future research. Our investigation focuses on the interrelation among the three main mechanisms by which enantioselectivity can be bestowed to heterogeneous catalysts, namely: (1) by templating chirality via the adsorption of chiral supramolecular assemblies, (2) by using chiral modifiers capable of forming chiral complexes with the reactant and force enantioselective surface reactions, and (3) by forming naturally chiral surfaces using imprinting chiral agents. Individually, the members of our team are leaders in these various aspects of chiral catalysis, but the present program provides the vehicle to generate and exploit the synergies necessary to address the problem in a comprehensive manner. Our initial work has advanced the methodology needed for these studies, including an enantioselective titration procedure to identify surface chiral sites, infrared spectroscopy in situ at the interface between gases or liquids and solids to mimic realistic catalytic conditions, and DFT and Monte Carlo algorithms to simulate and understand chirality on surfaces. The next step, to be funded by the monies requested in this proposal, is to apply those methods to specific problems in chiral catalysis, including the identification of the requirements for the formation of supramolecular surface structures with enantioselective behavior, the search for better molecules to probe the chiral nature of the modified surfaces, the exploration of the transition from supramolecular to one-to-one chiral modification, the correlation of the adsorption characteristics of one-to-one chiral modifiers with their physical properties, in particular with their configuration, and the development of ways to imprint chiral centers on achiral solid surfaces. Chiral catalysis is not only a problem of great importance in its own right, but also the ultimate test of how to control selectivity in catalysis. The time is ripe for fundamental work in heterogeneous chiral catalysis to provide the U.S. with a leadership role in developing the next generation of catalytic processes for medicinal and agrochemical manufacturing. Our team provides the required expertise for a synergistic and comprehensive integration of physical and chemical experimentation with solid state and molecular reactivity theories to solve this problem.

Francisco Zaera

2012-03-21T23:59:59.000Z

8

Prolonging the lifetime of wireless sensor networks using multi-level clustering and heterogeneity  

Science Conference Proceedings (OSTI)

Clustering in wireless sensor networks (WSNs) is an important technique to prolong lifetime of a WSN. This paper proposes energy efficient multi-level clustering scheme called Power Aware Multi-level Clustering (PAMC) for homogeneous wireless sensor ... Keywords: algorithm, energy efficiency, heterogeneity, multi-level clustering, wireless sensor networks

Surender Soni; Vivek Katiyar

2011-02-01T23:59:59.000Z

9

Measuring Firm Performance at the Network Level: A Nomology of the Business Impact of Digital Supply Networks  

Science Conference Proceedings (OSTI)

For decades, information technology has been posited to have a major impact on firm performance. Investigations into this line of inquiry have almost always used constructs related to individual firm performance as their dependent measures, ... Keywords: Business Networks, E-Business, E-Commerce, Firm Performance, Supply Chains, Supply Networks

Detmar Straub; Arun Rai; Richard Klein

2004-06-01T23:59:59.000Z

10

Lake Level Controlled Sedimentological I Heterogenity of Oil Shale, Upper Green River  

E-Print Network (OSTI)

Chapter 3 Lake Level Controlled Sedimentological 1:'_i 'I I Heterogenity of Oil Shale, Upper Green email: mgani@uno.edu t",. The Green River Formation comprises the world's largest deposit of oil-shale characterization of these lacustrine oil-shale deposits in the subsurface is lacking. This study analyzed ~300 m

Gani, M. Royhan

11

Migrating to internet-based e-commerce: factors affecting e-commerce adoption and migration at the firm level  

Science Conference Proceedings (OSTI)

Web technology has enabled e-commerce. However, in our review of the literature, we found little research on how firms can better position themselves when adopting e-commerce for revenue generation. Drawing upon technology diffusion theory, we developed ... Keywords: EDI, e-commerce, innovation adoption, internet technology, migration, outsourcing, technology diffusion

Weiyin Hong; Kevin Zhu

2006-03-01T23:59:59.000Z

12

Levelized Scheduling of Directed A-Cyclic Precedence Constrained Task Graphs onto Heterogeneous Computing System  

Science Conference Proceedings (OSTI)

Efficient scheduling of processes onto processors of a heterogeneous computing system has always been an important and challenging area of research.The scheduling problem has been shown to be NP-Complete in general cases as well as in several restricted ...

E. Illvarasan; P. Thambidurai

2005-02-01T23:59:59.000Z

13

Essays on taxation and firm behavior  

E-Print Network (OSTI)

This dissertation consists of three essays that examine the impact of tax policy of firm behavior. The first chapter uses new well-level production data on California oil wells and after-tax producer prices to estimate how ...

Rao, Nirupama S

2010-01-01T23:59:59.000Z

14

2010FirmRateAdj  

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

Firm Peaking Revenue Requirement 320.2 million P-SMPB--ED Composite Rate 33.25 millskWh Firm Demand 7.65kWmo Firm Energy 19.05 millskWh Firm Peaking Demand 6.90kWmo Firm...

15

Do Private Firms Invest Dierently than Public Firms? Taking Cues from the Natural Gas Industry  

E-Print Network (OSTI)

Do Private Firms Invest Dierently than Public Firms? Taking Cues from the Natural Gas Industry Erik and public rms using a unique dataset of onshore U.S. natural gas producers. In rm-level regressions we nd that investments by private rms are 68% less responsive to changes in natural gas prices, a measure that captures

Lin, Xiaodong

16

Windy Gap Firming Project  

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

Windy Gap Firming Project Windy Gap Firming Project Skip Navigation Links Transmission Functions Infrastructure projects Interconnection OASIS OATT Windy Gap Firming Project, Final Environmental Impact Statement, DOE/EIS-0370 (cooperating agency) Western's proposed action is to relocate approximately 3.8 miles of the existing Estes to Lyons 115-kilovolt transmission line, if the Chimney Hollow Reservoir alternative is constructed. The line would be moved outside the area proposed for the reservoir, and Western would ensure the new location would allow the agency to continue to operate and maintain it. Section 2.4.1.4 of the Final Environmental Impact Statement, Volume 1 provides more information on the transmission line relocation proposal. The U.S. Department of the Interior, Bureau of Reclamation is the Lead Agency for the National Environmental Policy Act Review. Cooperating agencies are Western, the U.S. Army Corps of Engineers and Grand County, Colo.

17

FIRM PRODUCTIVITY AND SUNK COSTS  

E-Print Network (OSTI)

The main objective of this paper is to explore whether or not sunk costs are systematically related to productivity di¤erences at the …rm level, as suggested by models of industry dynamics (Hopenhayn, 1992).The comparisons of productivity distributions for groups of …rms with di¤erent levels of sunk costs are performed by non-parametric procedures and for a large scale …rm-level panel data set of Spanish manufacturing …rms. We …nd that sunk costs are an important source of heterogeneity across …rm productivity. The evidence we …nd is consistent with models of industry dynamics predicting lower productivity for …rms with a higher level of sunk costs.

Jose C. Fariñas; Sonia Ruano

2004-01-01T23:59:59.000Z

18

Price Dispersion on the Internet: Good Firms and Bad Firms  

E-Print Network (OSTI)

Abstract. Internet firms charge a wide range of prices for homogeneous products, and high-priced firms remain high-priced and low-priced firms remain low-priced over long periods. One explanation is that high-price firms are charging a premium for superior service. An alternative, price-dispersion explanation is that firms vary the prices for informed and uniformed consumers (Salop and Stiglitz, 1977) or serious shoppers and others (Wilde and Schwartz, 1979). The pricing pattern for a digital camera and a flatbed scanner is consistent with the price-dispersion model and inconsistent with the service-premium hypothesis. I.

Kathy Baylis; Jeffrey M. Perloff

2002-01-01T23:59:59.000Z

19

Electricity Cost and Firm Performance: Evidence from India  

E-Print Network (OSTI)

Despite the widely acknowledged importance of infrastructure for economic growth, there has been relatively little research on how infrastructure affects the decisions of firms. Using data on Indian manufacturing firms, this paper provides evidence on how electricity prices affect a firm’s industry choice and productivity growth. I construct an instrument for electricity price as the interaction between the price of coal paid by power utilities, which is arguably exogenous to firm characteristics, and the initial share of thermal generation in a state’s total electricity generation capacity. I find that, in response to an exogenous increase in electricity price, firms reduce their electricity consumption and switch to industries with less electricity-intensive production processes. I also find that firm output, machine intensity and labor productivity decline with an increase in electricity price. In addition to these level effects, I show that firm output and productivity growth rates are negatively affected by high electricity prices. These results suggest that electricity constraints faced by firms may limit a country’s growth by leading firms to operate in industries with fewer productivity-enhancing opportunities.

Ama Baafra Abeberese

2012-01-01T23:59:59.000Z

20

Firm Heterogeneity in Capital labor Ratios and Wage Inequality  

E-Print Network (OSTI)

n d the dispersion of capital intensity across i r m s . TheThe upward trend i n capital intensity dispersion is commonof wages a n d of capital intensity across i r m s is

Leonardi, Marco

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Effective document clustering for large heterogeneous law firm collections  

Science Conference Proceedings (OSTI)

Computational resources for research in legal environments have historically implied remote access to large databases of legal documents such as case law, statutes, law reviews and administrative materials. Today, by contrast, there exists enormous growth ... Keywords: document clustering, knowledgement management, legal data, taxonomy development

Jack G. Conrad; Khalid Al-Kofahi; Ying Zhao; George Karypis

2005-06-01T23:59:59.000Z

22

Goal Orientation as Shaping the Firm's Entrepreneurial Orientation and Performance  

E-Print Network (OSTI)

Firms’ top decision makers cannot possibly know what decisions to make. Rather, decision makers must interpret their situations and make the best possible decision based upon their interpretation of their situations. In this dissertation, I examine decision-makers’ goal orientations as influencing how they interpret their situations and then respond through making decisions in terms of their firms’ entrepreneurial orientations. I also examine whether these decisions influence firm performance. I surveyed top firm decision makers in the Association of Former Students’ database at Texas A and M University. The hypotheses were tested using a structural equation modeling. Using a sample of 273 firms, I find that decision-makers’ goal orientations shape their firm’s entrepreneurial orientations, which in turn influence firm growth, relative performance, and expected future performance. Possessing a learning goal orientation was found to be positively related to innovativeness, proactiveness, and risk taking. A performance prove goal orientation was positively related to innovativeness, whereas a performance avoid goal orientation was negatively related to innovativeness and risk taking. Only a proactive firm posture was found to be positively related to firm performance. The results for this dissertation provide compelling support for upper echelons theory. Decision-makers’ finer-grained personal attributes are found to shape firm-level outcomes. More specifically, decision-makers’ goal orientations are found to shape the firm’s entrepreneurial orientation and, to some extent, performance. Interestingly, coarse-grained personal attributes captured in demographic proxies and used as control variables in the analyses did not provide consistent support for upper echelons theory. The results suggest that scholars need to take a finer-grained perspective of upper echelons theory. A substantial amount of research has established the link between individuals’ goal orientations and how they interpret and respond to their situations. The research here has extended this relationship to the top decision-making context in firms where individuals face strong situational forces caused by uncertainty, complexity, and dynamism. I hope that this research encourages other scholars to (1) examine more complex models of how decision-makers’ personal attributes influence their entrepreneurial decisions in terms of both recognizing and exploiting opportunities, and (2) examine other finer-grained attributes of top decision makers within a finer-grained framework of the decision-making process.

Webb, Justin W.

2009-12-01T23:59:59.000Z

23

Where do firms manage earnings?  

E-Print Network (OSTI)

Despite decades of research on how, why, and when companies manage earnings, there is a paucity of evidence about the geographic location of earnings management within multinational firms. In this study, we examine where ...

Dyreng, Scott D.

24

Manticore: a heterogeneous parallel language  

Science Conference Proceedings (OSTI)

The Manticore project is an effort to design and implement a new functional language for parallel programming. Unlike many earlier parallel languages, Manticore is a heterogeneous language that supports parallelism at multiple levels. Specifically, ...

Matthew Fluet; Mike Rainey; John Reppy; Adam Shaw; Yingqi Xiao

2007-01-01T23:59:59.000Z

25

Level  

E-Print Network (OSTI)

7 at level 3 (FHEQ level 6) and the rest at level M (FHEQ level 7) 4. Other entry N/A Credit Level awards (if applicable): 5. Exit Awards: PGDip Advanced Computer Science 120 credits with not more than 30 credits at level 3 (FHEQ level 6) and the rest at level M (FHEQ level 7) Credit

Programme Csad

2007-01-01T23:59:59.000Z

26

Level  

E-Print Network (OSTI)

7 at level 3 (FHEQ level 6) and the rest at level M (FHEQ level 7) 4. Other entry N/A Credit Level awards (if applicable): 5. Exit Awards: PGDip Computer Science 120 credits with not more than 30 credits at level 3 (FHEQ level 6) and the rest at level M (FHEQ level 7) Credit

unknown authors

2006-01-01T23:59:59.000Z

27

Corporate Investment, Book-to-Market, Firm Size and Stock Returns: Empirical Evidence  

E-Print Network (OSTI)

We examine the empirical relations among firm-level investment growth, market value of equity, bookto-market ratio (B/M), and stock returns. Under the widely used Fama and French (FF) methods, firms classified as big and low-B/M (B/L) significantly accelerate investment prior to the classification year. Their market values of equity rise and their leverage levels diminish. Firms classified as small and high-B/M (S/H) reduce investment and increase leverage. In other words, FF classification methods implicitly assign firms to portfolios conditional on past investment growth. Berk, Green, and Naik (BGN, 1999) offer a model and simulations consistent with such patterns in firm-level fundamentals. BGN’s model also predicts that systematic risk and expected equity returns evolve dynamically with firm-level investment, and that firm fundamentals such as B/M and firm size proxy for investment-related changes in risk. Consistent with BGN, we find that average raw returns vary across portfolios of stocks formed on the basis of past investment growth. We find weakened evidence of a value premium after categorizing stocks by investment growth. Investment growth also has explanatory power in cross-sectional and timeseries regressions of stock returns and appears to provide information similar to that of B/M.

Christopher W. Anderson; Luis Garcia-Feijóo

2002-01-01T23:59:59.000Z

28

Supporting international entry decisions for construction firms using fuzzy preference relations and cumulative prospect theory  

Science Conference Proceedings (OSTI)

This paper emphasizes on supporting international entry decisions for construction firms in a three-phase analysis process. Phase I identified significant factors as two categories, namely country and project factor levels. Phase II stuck on identifying ... Keywords: Alternative selection, Construction firms, Cumulative prospect theory, Fuzzy preference relations, International construction market

Min-Yuan Cheng; Hsing-Chih Tsai; Kai-Hsiang Chuang

2011-11-01T23:59:59.000Z

29

Industry Recommendations: Characteristics, Investment Value, and Relation to Firm Recommendations *  

E-Print Network (OSTI)

We study analysts ’ industry recommendations. We find that the distribution of industry recommendations is quite balanced. Analysts show more optimism towards industries with high levels of R&D, past profitability and past returns, as well as industries in which they are active as underwriters. Industry recommendations possess investment value as portfolios based on these recommendations generate abnormal returns. Finally, industry recommendations contain information which is orthogonal to that included in firm recommendations. Analysts benchmark their firm recommendations to industry peers regardless of their disclosures. Consequently, the investment value of analysts’ recommendations is enhanced when both industry and firm recommendations are used. An earlier version of this paper was circulated under the title “Do Industry Recommendations Have

Ohad Kadan; Leonardo Madureira; Rong Wang; Tzachi Zach; Reuven Lehavy; Roni Michaely; Brian Richter; Ajai Singh; Brett Trueman; Seminar Participants

2009-01-01T23:59:59.000Z

30

Definition: Firm Transmission Service | Open Energy Information  

Open Energy Info (EERE)

Definition No reegle definition available. Also Known As Firm services Related Terms transmission lines, electricity generation, transmission line, smart grid References ...

31

Level  

E-Print Network (OSTI)

7 180 credits with not more than 30 credits at level 3 (FHEQ level 6) and the rest at level M (FHEQ level 7) 4. Other entry N/A Credit Level awards (if applicable): 5. Exit Awards: PGDip in Advanced Computer Science with

Programme Csci

2010-01-01T23:59:59.000Z

32

The Value Relevance of IT Investments on Firm Value in the Financial Services Sector  

Science Conference Proceedings (OSTI)

Understanding and assessing the payoff from investments in IT is an important exercise for managers. A number of researchers have examined the elusive notion of firm-level information system effectiveness and the results are mixed. This study contributes ...

Ram S. Sriram; Gopal V. Krishnan

2003-01-01T23:59:59.000Z

33

Towards developing a framework for measuring organizational impact of IT- enabled BPR: case studies of three firms  

Science Conference Proceedings (OSTI)

This article reports on a case study of three firms which examined the organizational-level measures and process-level measures that were used to identify the effects of IT-enabled BPR (Business Process Redesign) projects. Firms in three distinct industry ... Keywords: IT, business process reengineering, information technology payoff, measurement, organizational impact, process theory

Rajiv Kohli; Ellen Hoadley

2006-01-01T23:59:59.000Z

34

PERSPECTIVE: The Myth of Firm Performance  

Science Conference Proceedings (OSTI)

Firm performance is one of the most prominent concepts in organizational research. Despite its importance, and despite the many developmental critiques that have appeared over the years, performance continues to be a difficult concept to apply in a scientifically ... Keywords: change, concept-measure mismatches, firm performance, legitimacy

C. Chet Miller, Nathan T. Washburn, William H. Glick

2013-05-01T23:59:59.000Z

35

Epigenetic and Conventional Regulation Is Distributed among Activators of FLO11 Allowing Tuning of Population-Level Heterogeneity in Its Expression  

E-Print Network (OSTI)

Epigenetic switches encode their state information either locally, often via covalent modification of DNA or histones, or globally, usually in the level of a trans-regulatory factor. Here we examine how the regulation of ...

Octavio, Leah M.

36

EIS-0370: Windy Gap Firming Project, Colorado | Department of...  

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

0: Windy Gap Firming Project, Colorado EIS-0370: Windy Gap Firming Project, Colorado Summary This EIS, prepared by the Department of the Interior (Bureau of Reclamation, Great...

37

Economic Activity of Firms and Asset Prices  

E-Print Network (OSTI)

In this review we survey the recent research on the fundamental determinants of stock returns. These studies explore how firms' systematic risk and their investment and production decisions are jointly determined in ...

Kogan, Leonid

38

Firm Size And Higher Education Graduate  

E-Print Network (OSTI)

of Tables 1. West Virginia Public Higher Education Graduate Work Participation By Area Of Concentration .................................................................................................1 Employment And Annualized Wages By West Virginia Firm Employment Size.....................................................18 Appendix I: Detailed Description Of Employment Data .........................................19

Mohaghegh, Shahab

39

Empirical essays on firm behavior in India  

E-Print Network (OSTI)

In this thesis, I study the behavior of industrial firms in India in the electricity market and with respect to locational choice and environmental regulation. In the first chapter, I study the competitive effects of ...

Ryan, Nicholas (Nicholas James)

2012-01-01T23:59:59.000Z

40

Do Firms Choose Their Stock Liquidity? A Study of Innovative Firms and Their Stock Liquidity ?  

E-Print Network (OSTI)

We ask whether firms can choose, or at least influence, their stock liquidity. We analyze a sample of firms that, we hypothesize, will value stock liquidity more than other firms – innovative firms that primarily hold intangible assets and expect to raise capital from the stock market. Consistent with their reliance on equity markets, we find that innovative firms have higher liquidity and that they take a variety of actions (e.g., frequent earnings guidance, stock splits etc) that help keep their stock more liquid. Maintaining liquidity appears to be less of a concern when innovative firms have greater access to other sources of capital. Given their low leverage, there is greater reliance on monitoring by large equity-holders and incentive contracts to help resolve agency issues, rather than banks or other creditors: consistent with the greater institutional ownership, higher likelihood of blockholders, and more incentivized CEO compensation contracts in these firms. The marginal impact on firm value (Tobin’s Q) of a plausibly exogenous increase in liquidity (e.g., following decimalization of stock prices) is greater for innovative firms, especially when CEOs have strong incentive contracts. Innovative activity tends to increase in the wake of such liquidity enhancements.

Nishant Dass; Vikram N; Steven Chong Xiao; Nikunj Kapadia; Simi Kedia; Pete Kyle; Er Ljungqvist

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Hierarchical sizing and biasing of analog firm intellectual properties  

Science Conference Proceedings (OSTI)

A hierarchical sizing and biasing methodology for analog firm intellectual properties (IPs) is presented. An analog firm IP designates an unsized transistor netlist of an analog circuit. The methodology sizes and biases an analog firm IP by automatically ... Keywords: Analog design, Analog firm IP, Modeling, Reuse, Simulation, Sizing, Synthesis

Ramy Iskander; Marie-Minerve LouëRat; Andreas Kaiser

2013-03-01T23:59:59.000Z

42

The effect of own-firm and other-firm experience on foreign direct investment survival  

E-Print Network (OSTI)

We argue that foreign firms operating in a host country generate information spillovers that have potential value for later foreign direct investment. We test two predictions. First, we expect foreign direct investments by firms with experience in a host country to be more likely to survive than investments made by first-time entrants. Second, foreign direct investments will be more likely to survive the greater the foreign presence in the target industry at the time of investment, subject to two contingencies. The first contingency is that the relationship will be weak or nonexistent among firms with no experience in the host country, because these firms have difficulty evaluating and taking advantage of the information spillovers. The second contingency is that the presence of other foreign firms will not affect investment survival among firms that already have a presence in the target industry and undertake expansion. These firms already possess general information about the target industries and are unlikely to gain additional benefit from information spillovers. We find supportive evidence based on the survival to 1992 among 354 U.S. investments undertaken by foreign firms in manufacturing industries

J. Myles Shaver; Will Mitchell; Bernard Yeung

1997-01-01T23:59:59.000Z

43

Are New IT-Enabled Investment Opportunities Diminishing for Firms?  

Science Conference Proceedings (OSTI)

Today, few firms could survive for very long without their computer systems. IT has permeated every corner of firms. Firms have reached the current state in their use of IT because IT has provided myriad opportunities for firms to improve performance ... Keywords: IT and firm performance, IT value, business value of IT, event study, financial market evaluation, information technology industry, macroeconomic news, stock price volatility

Brian L. Dos Santos; Zhiqiang (Eric) Zheng; Vijay S. Mookerjee; Hongyu Chen

2012-06-01T23:59:59.000Z

44

Environmental Policy Tools and Firm-Level Management and Practices  

E-Print Network (OSTI)

Manufacture of coke, refined petroleum products and nuclear fuel 23 Manufacture of chemicals and chemical for differentiation of our products It may improve our facility's profile/image It may create cost savings in terms of use of inputs It may create cost savings in terms of waste management It may improve information about

Darnall, Nicole

45

Communication in an "Officeless firm"  

E-Print Network (OSTI)

at locations remote from one another and typically make heavy use of ICTs such as e-mail, telephone and an intranet to facilitate communication and collaboration (Cramton, 2002, Lipnake and Stamps, 2000). 3 Distributed work can take a number of forms... . It seems reasonable that the issue of trust is much easier to handle in a small team like Puma. Michael agreed that they shared a high level of trust when working together: “[trust] is quite possible for a company our size. I don't think if we were much...

Burchell, Brendan J.; Lai, Yi

2008-01-01T23:59:59.000Z

46

Macroeconomic Conditions, Firm Characteristics, and ... - Springer  

Science Conference Proceedings (OSTI)

rate as well as the dynamics of the asset value of the issuing firm. ..... each credit rating over a given horizon, the calibration yields a distinctive value of ..... Conference in Venice, Italy, the 2004 FMA Annual Meeting in New Orleans, and at ...

47

Heterogeneous particle swarm optimizers  

Science Conference Proceedings (OSTI)

Particle swarm optimization (PSO) is a swarm intelligence technique originally inspired by models of flocking and of social influence that assumed homogeneous individuals. During its evolution to become a practical optimization tool, some heterogeneous ...

Marco A. Montes De Oca; Jorge Peña; Thomas Stützle; Carlo Pinciroli; Marco Dorigo

2009-05-01T23:59:59.000Z

48

Towards heterogeneous distributed debugging  

Science Conference Proceedings (OSTI)

Several years of research and development in parallel debugger design have given up several techniques, though implemented in a wide range of tools for an equally wide range of systems. This paper is an evaluation of these myriad techniques as applied to the design of a heterogeneous distributed debugger. The evaluation is based on what features users perceive as useful, as well as the ease of implementation of the features using the available technology. A preliminary architecture for such a heterogeneous tool is proposed. Our effort in this paper is significantly different from the other efforts at creating portable and heterogeneous distributed debuggers in that we concentrate on support for all the important issues in parallel debugging, instead of simply concentrating on portability and heterogeneity.

Damodaran-Kamal, S.K.

1995-04-01T23:59:59.000Z

49

Inquiries into the behavior of emerging market firms  

E-Print Network (OSTI)

This dissertation addresses two aspects of firm behavior in emerging markets. Chapters 1 and 3 consider the decision of firms to borrow in domestic or foreign currency and the implications of this decision on fixed capital ...

Cowan, Kevin

2002-01-01T23:59:59.000Z

50

The Impact of Forest Certification on Firm Financial Performance in ...  

Science Conference Proceedings (OSTI)

empirically the impact of environmental certification on firm financial performance ... QMI: Quality Management Institute; SFI: Sustainable. Forestry Initiative; SCS: ...

51

Definition: Non-Firm Transmission Service | Open Energy Information  

Open Energy Info (EERE)

available. Also Known As Interruptible Load or Interruptible Demand Related Terms transmission lines, electricity generation, transmission line, firm transmission service,...

52

Y-12 cleaning technology licensed by Knoxville engineering firm...  

National Nuclear Security Administration (NNSA)

cleaning technology licensed by Knoxville engineering firm | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the...

53

The Role of Industry, Geography and Firm Heterogeneity in Credit Risk Diversification  

E-Print Network (OSTI)

theoretical framework where the GVAR is derived as an approximation to a global unobserved common factor model. 13 the underlying macroeconomic factors (domestic and foreign), the exogenous global variables (in our application oil prices) and the ?rm... in the GVAR model. A general form of these return regressions is given by (23). Given the diverse nature of the ?rms in our portfolio, one is tempted to include all the domestic, foreign and global factors (i.e. oil price changes) in the multi...

Pesaran, M Hashem; Schuermann, Til; Treutler, Bjorn-Jakob

2006-03-14T23:59:59.000Z

54

Costa Rica-Facilitating Implementation and Readiness for Mitigation (FIRM)  

Open Energy Info (EERE)

Costa Rica-Facilitating Implementation and Readiness for Mitigation (FIRM) Costa Rica-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: Costa Rica-Facilitating Implementation and Readiness for Mitigation (FIRM) Name Costa Rica-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Costa Rica UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1]

55

Ethiopia-Facilitating Implementation and Readiness for Mitigation (FIRM) |  

Open Energy Info (EERE)

Ethiopia-Facilitating Implementation and Readiness for Mitigation (FIRM) Ethiopia-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: Ethiopia-Facilitating Implementation and Readiness for Mitigation (FIRM) Name Ethiopia-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Ethiopia UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1]

56

UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) | Open  

Open Energy Info (EERE)

UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) Name UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 References Facilitating Implementation and Readiness for Mitigation (FIRM)[1] "The Government of Denmark will provide US$6 million to the new programme

57

Facilitating Implementation and Readiness for Mitigation (FIRM) | Open  

Open Energy Info (EERE)

Facilitating Implementation and Readiness for Mitigation (FIRM) Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) Name UNEP-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Costa Rica, Ethiopia, Ghana, Indonesia, Mexico, Morocco, Senegal, South Africa, Vietnam UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1]

58

Heterogeneous waste processing  

DOE Patents (OSTI)

A combination of treatment methods are provided for treatment of heterogeneous waste including: (1) treatment for any organic compounds present; (2) removal of metals from the waste; and, (3) bulk volume reduction, with at least two of the three treatment methods employed and all three treatment methods emplyed where suitable.

Vanderberg, Laura A. (Los Alamos, NM); Sauer, Nancy N. (Los Alamos, NM); Brainard, James R. (Los Alamos, NM); Foreman, Trudi M. (Los Alamos, NM); Hanners, John L. (Los Alamos, NM)

2000-01-01T23:59:59.000Z

59

Exporting licensing regulations affecting US geothermal firms  

DOE Green Energy (OSTI)

This document presents a brief introduction and overview of the Department of Commerce's Export Administration Regulations which might affect potential US geothermal goods exporters. It is intended to make US geothermal firms officials aware of the existence of such regulations and to provide them with references, contacts and phone numbers where they can obtain specific and detailed information and assistance. It must be stressed however, that the ultimate responsibility for complying with the above mentioned regulations lies with the exporter who must consult the complete version of the regulations.

Not Available

1988-08-01T23:59:59.000Z

60

REQUESTS FOR PAYMENTS UNDER FIRM-FIXED PRICE CONSTRUCTION CONTRACTS  

REQUESTS FOR PAYMENTS UNDER FIRM-FIXED PRICE CONSTRUCTION CONTRACTS Author: wshelto Last modified by: wshelto Created Date: 2/28/2008 3:26:00 PM Company:

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Analysis of Firm Transportation Contracts: Results and Methodology  

U.S. Energy Information Administration (EIA)

The pipeline companies must provide firm transportation ... 1996, no rollover amount, and a contract length of 1 year or more. Energy Information ...

62

SF6432-FP (02-01-12) Firm Fixed Price  

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

SF 6432-FP (072013) Section II STANDARD TERMS AND CONDITIONS FOR FIRM-FIXED PRICE CONTRACTS THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS...

63

Y-12 cleaning technology licensed by Knoxville engineering firm...  

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

firm recently became the newest licensee of technology developed at the Y-12 National Security Complex. MK Technologies Corporation is now the exclusive commercial patent...

64

Programming in Manticore, a heterogenous parallel functional language  

Science Conference Proceedings (OSTI)

The Manticore project is an effort to design and implement a new functional language for parallel programming. Unlike many earlier parallel languages, Manticore is a heterogeneous language that supports parallelism at multiple levels. Specifically, the ...

Matthew Fluet; Lars Bergstrom; Nic Ford; Mike Rainey; John Reppy; Adam Shaw; Yingqi Xiao

2009-05-01T23:59:59.000Z

65

IS Planning autonomy in US subsidiaries of multinational firms  

Science Conference Proceedings (OSTI)

Research has suggested that information systems planning is an important challenge to managers of multinational firms. Although studies have examined marketing, finance, and manufacturing, limited research has considered IS planning autonomy in such ... Keywords: IS planning, agency theory, autonomy, corporate governance theory, multinational firms

Dinesh A. Mirchandani; Albert L. Lederer

2004-11-01T23:59:59.000Z

66

Ghana-Facilitating Implementation and Readiness for Mitigation (FIRM) |  

Open Energy Info (EERE)

Ghana-Facilitating Implementation and Readiness for Mitigation (FIRM) Ghana-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: Ghana-Facilitating Implementation and Readiness for Mitigation (FIRM) Name Ghana-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Ghana UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1] "The Government of Denmark will provide US$6 million to the new programme

67

Morocco-Facilitating Implementation and Readiness for Mitigation (FIRM) |  

Open Energy Info (EERE)

Morocco-Facilitating Implementation and Readiness for Mitigation (FIRM) Morocco-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: Morocco-Facilitating Implementation and Readiness for Mitigation (FIRM) Name Morocco-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Morocco UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1] "The Government of Denmark will provide US$6 million to the new programme

68

Leading firms choose ENERGY STAR | ENERGY STAR Buildings & Plants  

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

Leading firms choose ENERGY STAR Leading firms choose ENERGY STAR Secondary menu About us Press room Contact Us Portfolio Manager Login Facility owners and managers Existing buildings Commercial new construction Industrial energy management Small business Service providers Service and product providers Verify applications for ENERGY STAR certification Design commercial buildings Energy efficiency program administrators Commercial and industrial program sponsors Associations State and local governments Federal agencies Tools and resources Training In this section Why you should design to earn the ENERGY STAR Leading firms choose ENERGY STAR Why new doesn't always mean efficient Follow EPA's step-by-step process ENERGY STAR Challenge for Architects Leading firms choose ENERGY STAR Facebook data center Hundreds of leading A/E firms have already partnered

69

Vietnam-Facilitating Implementation and Readiness for Mitigation (FIRM) |  

Open Energy Info (EERE)

Vietnam-Facilitating Implementation and Readiness for Mitigation (FIRM) Vietnam-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: Vietnam-Facilitating Implementation and Readiness for Mitigation (FIRM) Name Vietnam-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Vietnam UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1] "The Government of Denmark will provide US$6 million to the new programme

70

Mexico-Facilitating Implementation and Readiness for Mitigation (FIRM) |  

Open Energy Info (EERE)

Mexico-Facilitating Implementation and Readiness for Mitigation (FIRM) Mexico-Facilitating Implementation and Readiness for Mitigation (FIRM) Jump to: navigation, search Logo: Mexico-Facilitating Implementation and Readiness for Mitigation (FIRM) Name Mexico-Facilitating Implementation and Readiness for Mitigation (FIRM) Agency/Company /Organization United Nations Environment Programme (UNEP) Partner Global Environment Facility (GEF), Government of Denmark Sector Climate, Energy, Land Topics Adaptation, Co-benefits assessment, - Environmental and Biodiversity, Finance, Implementation, Low emission development planning Website http://www.unep.org/climatecha Program Start 2011 Program End 2013 Country Mexico UN Region Central America References Facilitating Implementation and Readiness for Mitigation (FIRM)[1] "The Government of Denmark will provide US$6 million to the new programme

71

Utility Sector Leaders Make Firm Commitment to Energy Efficiency |  

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

Utility Sector Leaders Make Firm Commitment to Energy Efficiency Utility Sector Leaders Make Firm Commitment to Energy Efficiency Utility Sector Leaders Make Firm Commitment to Energy Efficiency Utility Sector Leaders Make Firm Commitment to Energy Efficiency: Press Release, July 31, 2006 announcing an energy efficiency action plan. More than 80 energy, environmental and other organizations announced commitments and public statements in support of the National Action Plan for Energy Efficiency (NAPEE), which provides energy consumers and providers information on policies and techniques to save money as well as protect the environment. Utility Sector Leaders Make Firm Commitment to Energy Efficiency More Documents & Publications Chapter 3: Demand-Side Resources US - Brazil Binational Energy Working Group Joint Action Plan

72

Modeling complex heterogeneous objects with non-manifold heterogeneous cells  

Science Conference Proceedings (OSTI)

This paper presents a new approach to model complex heterogeneous objects with simultaneous geometry intricacies as well as complex material distributions. Different from most of the existing approaches, which utilize manifold B-Rep and the assembly ... Keywords: Attribute based reasoning, Boolean operation, Cellular model, Heterogeneous material, Non-manifold

X. Y. Kou; S. T. Tan; W. S. Sze

2006-05-01T23:59:59.000Z

73

U.S. Department of Energy Selects Venture Capital Firms to Accelerate...  

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

Venture Capital Firms to Accelerate Adoption of Advanced Energy Technologies U.S. Department of Energy Selects Venture Capital Firms to Accelerate Adoption of Advanced Energy...

74

Cross section space shielding in double heterogeneous HTGR systems  

SciTech Connect

Collision probability methods using rational approximations for space shielding of cross sections in nuclear reactor codes allowing for one level of heterogeneity are first reviewed. A Dancoff factor for a cylindrical HTGR fuel pin with grain structure is then derived. A new simple method for cross section space shielding in a doubly heterogeneous HTGR system using collision probabilities and rational approximations is subsequently presented and calculations based on it are compared with calculations based on more elaborate methods. 39 references. (auth)

Stamatelatos, M.G.

1975-11-01T23:59:59.000Z

75

Power management for heterogeneous clusters: An experimental study  

Science Conference Proceedings (OSTI)

Reducing energy consumption has a significant role in mitigating the total cost of ownership of computing clusters. Building heterogeneous clusters by combining high-end and low-end server nodes (e.g., Xeons and Atoms) is a recent trend towards achieving ... Keywords: Web server cluster, power management, heterogeneous cluster, energy consumption, high-end server nodes, low-end server nodes, Xeons, Atoms, energy-efficient computing, cluster-level power manager, optimal cluster configuration

M. Mustafa Rafique; Nishkam Ravi; Srihari Cadambi; Ali R. Butt; Srimat Chakradhar

2011-07-01T23:59:59.000Z

76

FirmGreen Energy Inc FGE | Open Energy Information  

Open Energy Info (EERE)

FirmGreen Energy Inc FGE FirmGreen Energy Inc FGE Jump to: navigation, search Name FirmGreen Energy Inc (FGE) Place Irvine, California Zip 92612 Product FirmGreen Energy Inc is an integrated energy company participating in virtually all aspects of the global green energy business. Coordinates 41.837752°, -79.268594° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.837752,"lon":-79.268594,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

77

Coverage of Independent Audits of For-Profit Firms  

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

Government need an audit? Can the audit be integrated with the regular audit of a firm's financial statements? What are the objectives of the audit? What is the source of the...

78

Fact Sheet: Wind Firming EnergyFarm (October 2012)  

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

Institute (EPRI). The EnergyFarm will displace a planned 73 million natural-gas-fired power plant intended to smooth (or firm) the output of intermittent wind and solar energy....

79

The influence of institutional investors on firm value  

E-Print Network (OSTI)

The impact of corporate governance on firm value has been extensively debated by academics and business practitioners. Some studies show that companies that allow minority shareholders to have more control are likely to ...

Lee, Yong Seung

2013-01-01T23:59:59.000Z

80

Y-12 cleaning technology licensed by local engineering firm ...  

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

cleaning technology ... Y-12 cleaning technology licensed by local engineering firm Posted: October 31, 2012 - 10:00am MK Technologies CEO and founder Mike Carroll and director of...

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Investment and Bidding Strategies in Markets for Firm Transmission Rights  

Science Conference Proceedings (OSTI)

The first part of this paper addresses the applicability of the Markowitz portfolio theory to investing in Contracts for Firm Transmission Right (CFTRs) or Transmission Congestion Contracts (TCCs) typical for electricity markets in Northeastern US (PJM, ...

Aleksandr Rudkevich

2004-01-01T23:59:59.000Z

82

When governments break contracts : foreign firms in emerging economies  

E-Print Network (OSTI)

Emerging economy governments commit to protect the property rights of foreign firms through a variety of contracts, from treaties to direct agreements. In an era of liberalized capital flows, these contracts are thought ...

Wellhausen, Rachel L. (Rachel Louise)

2012-01-01T23:59:59.000Z

83

Session Overview: Heterogeneous Combustion Randall E. Winans...  

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

Heterogeneous Combustion Randall E. Winans, Session Chair X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA Heterogeneous...

84

Heterogeneous Enterprises in a Macroeconomic Agent-Based Model  

E-Print Network (OSTI)

We present a macroeconomic agent-based model that combines several mechanisms operating at the same timescale, while remaining mathematically tractable. It comprises enterprises and workers who compete in a job market and a commodity goods market. The model is stock-flow consistent; a bank lends money charging interest rates, and keeps track of equities. Important features of the model are heterogeneity of enterprises, existence of bankruptcies and creation of new enterprises, as well as productivity increase. The model's evolution reproduces empirically found regularities for firm size and growth rate distributions. It combines probabilistic elements and deterministic dynamics, with relative weights that may be modified according to the considered problem or the belief of the modeler. We discuss statistical regularities on enterprises, the origin and the amplitude of endogeneous fluctuations of the system's steady state, as well as the role of the interest rate and the credit volume. We also summarize obtain...

Metzig, Cornelia

2012-01-01T23:59:59.000Z

85

Heterogeneity and interconnect  

Science Conference Proceedings (OSTI)

The current usage of client devices - smart phones, tracking devices and wearable electronics - force us to take a deep look at energy consumption, they demand long battery life. Energy needs also get exacerbated by the demands of high level of connectivity, ...

Ganapati Srinivasa

2012-06-01T23:59:59.000Z

86

Textured Metal Catalysts for Heterogeneous Catalysis ...  

Biomass and Biofuels Advanced Materials Textured Metal Catalysts for Heterogeneous Catalysis Pacific Northwest National Laboratory. Contact ...

87

Utility Sector Leaders Make Firm Commitment to Energy Efficiency |  

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

Utility Sector Leaders Make Firm Commitment to Energy Efficiency Utility Sector Leaders Make Firm Commitment to Energy Efficiency Utility Sector Leaders Make Firm Commitment to Energy Efficiency July 31, 2006 - 9:30am Addthis (San Francisco, Calif. - July 31, 2006) More than 80 energy, environmental and other organizations announced commitments and public statements in support of the National Action Plan for Energy Efficiency (NAPEE), released today, which provides energy consumers and providers information on policies and techniques to save money as well as protect the environment. By adopting the plan's recommendations on low-cost, under-used energy efficiency, Americans could save hundreds of billions of dollars on their gas and electric utility bills, cut greenhouse gas emissions, and lower the costs for energy and pollution controls.

88

Renewal-anomalous-heterogeneous files  

E-Print Network (OSTI)

Renewal-anomalous-heterogeneous files are solved. A simple file is made of Brownian hard spheres that diffuse stochastically in an effective 1D channel. Generally, Brownian files are heterogeneous: the spheres' diffusion coefficients are distributed and the initial spheres' density is non-uniform. In renewal-anomalous files, the distribution of waiting times for individual jumps is exponential as in Brownian files, yet obeys: {\\psi}_{\\alpha} (t)~t^(-1-{\\alpha}), 0renewal as all the particles attempt to jump at the same time. It is shown that the mean square displacement (MSD) in a renewal-anomalous-heterogeneous file, , obeys, ~[_{nrml}]^{\\alpha}, where _{nrml} is the MSD in the corresponding Brownian file. This scaling is an outcome of an exact relation (derived here) connecting probability density functions of Brownian files and renewal-anomalous files. It is also shown that non-renewal-anomalous files are slower than the corresponding renewal ones.

Ophir Flomenbom

2010-08-13T23:59:59.000Z

89

Molecular ingredients of heterogeneous catalysis  

Science Conference Proceedings (OSTI)

The purpose of this paper is to present a review and status report to those in theoretical chemistry of the rapidly developing surface science of heterogeneous catalysis. The art of catalysis is developing into science. This profound change provides one with opportunities not only to understand the molecular ingredients of important catalytic systems but also to develop new and improved catalyst. The participation of theorists to find answers to important questions is sorely needed for the sound development of the field. It is the authors hope that some of the outstanding problems of heterogeneous catalysis that are identified in this paper will be investigated. For this purpose the paper is divided into several sections. The brief Introduction to the methodology and recent results of the surface science of heterogeneous catalysis is followed by a review of the concepts of heterogeneous catalysis. Then, the experimental results that identified the three molecular ingredients of catalysis, structure, carbonaceous deposit and the oxidation state of surface atoms are described. Each section is closed with a summary and a list of problems that require theoretical and experimental scrutiny. Finally attempts to build new catalyst systems and the theoretical and experimental problems that appeared in the course of this research are described.

Somorjai, G.A.

1982-06-01T23:59:59.000Z

90

Firms as Incubators of Open-Source Software  

Science Conference Proceedings (OSTI)

Many successful open-source projects have been developed by programmers who were employed by firms but worked on open-source projects on the side because of economic incentives like career improvement benefits. Such side work may be a good thing for ... Keywords: business models, game theory, learning by doing, open-source software, principal/agent, programmer compensation, programmer incentives, signalling

Amit Mehra; Rajiv Dewan; Marshall Freimer

2011-03-01T23:59:59.000Z

91

OM Forum---Operations Management Challenges for Some “Cleantech” Firms  

Science Conference Proceedings (OSTI)

A “cleantech” firm is one with an innovative technology and/or business model for serving an existing market with dramatically reduced environmental impact. This paper describes operations management OM challenges faced by five cleantech ... Keywords: bankruptcy, capacity investment, energy, environment, process innovation, public policy, supply chain management

Erica L. Plambeck

2013-10-01T23:59:59.000Z

92

Pricing and Firm Conduct in California's Deregulated Electricity Market  

E-Print Network (OSTI)

-fueled powerplants to private firms that bid daily to supply power. Southern California Edison divested the vast capacity in California. The remaining in-state capacity is two nuclear plants jointly owned by the utilities, a large number of hydroelectric units owned primarily by PG&E, and a variety of small independent

California at Berkeley. University of

93

Firm performance impacts of digitally enabled supply chain integration capabilities  

Science Conference Proceedings (OSTI)

Best practice exemplars suggest that digital platforms play a critical role in managing supply chain activities and partnerships that generate performance gains for firms. However, there is limited academic investigation on how and why information technology ... Keywords: IT infrastructure, customer relationships, operational excellence, revenue growth, supply chain integration, supply chain management

Arun Rai; Ravi Patnayakuni; Nainika Seth

2006-06-01T23:59:59.000Z

94

Identifying web strategies for large-scale firms  

Science Conference Proceedings (OSTI)

The World Wide Web has become increasingly important in helping businesses stay competitive. Hence, in the current business environment, it is essential for large firms in established industries to take advantage of the Web and all it has to offer in ... Keywords: integration, internet, organizational goals, strategy, web

Tuncay Bayrak

2008-07-01T23:59:59.000Z

95

Itinerary determination of imprecise mobile agents with firm deadline  

Science Conference Proceedings (OSTI)

In some applications, as part of a mobile agent mission, there may be the necessity of meeting a firm end-to-end deadline, although with some itinerary flexibility due to optional resources. This paper proposes an execution model based on the concept ... Keywords: Distributed systems, Mobile agents, Real-time

Luciana Rech; Carlos Montez; Rômulo Silva de Oliveira

2008-12-01T23:59:59.000Z

96

State-of-the-art in heterogeneous computing  

Science Conference Proceedings (OSTI)

Node level heterogeneous architectures have become attractive during the last decade for several reasons: compared to traditional symmetric CPUs, they offer high peak performance and are energy and/or cost efficient. With the increase of fine-grained ... Keywords: Power-efficient architectures, energy and power consumption, microprocessor performance, parallel computer architecture, stream or vector architectures

Andre R. Brodtkorb; Christopher Dyken; Trond R. Hagen; Jon M. Hjelmervik; Olaf O. Storaasli

2010-01-01T23:59:59.000Z

97

Carbon Fund for Spanish Firms FC2E | Open Energy Information  

Open Energy Info (EERE)

Spanish Firms FC2E Jump to: navigation, search Name Carbon Fund for Spanish Firms (FC2E) Place Spain Sector Carbon Product String representation "Instituto de Cr ... from the...

98

Are Foreign Firms Privileged By Their Host Governments? Evidence From The 2000 World Business Environment Survey  

E-Print Network (OSTI)

Using the data from World Business Environment Survey (WBES) on over 10,000 firms across eighty one countries, this paper finds preliminary evidence that foreign firms enjoy significant regulatory advantages - as perceived ...

Huang, Yasheng

2005-06-03T23:59:59.000Z

99

Complementary capabilities in dynamic environments : the evolution of professional services in information technology product firms  

E-Print Network (OSTI)

The innovative firm must continually evaluate its boundaries - decisions often shaped through make-buy-partner evaluations and choices about where to define the firm's competences. Building off of earlier work that suggests ...

Anderson, Phillip C., Ph. D. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

100

Event Model Interfaces for Heterogeneous System Analysis  

E-Print Network (OSTI)

Complex embedded systems consist of hardware and software components from different domains, such as control and signal processing, many of them supplied by different IP vendors. The embedded system designer faces the challenge to integrate, optimize and verify the resulting heterogeneous systems. While formal verification is available for some subproblems, the analysis of the whole system is currently limited to simulation or emulation. In this paper, we tackle the analysis of global resource sharing, scheduling, and buffer sizing in heterogeneous embedded systems. For many practically used preemptive and non-preemptive hardware and software scheduling algorithms of processors and busses, semi-formal analysis techniques are known. However, they cannot be used in system level analysis due to incompatibilities of their underlying event models. This paper presents a technique to couple the analysis of local scheduling strategies via an event interface model. We derive transformation rules between the most important event models and provide proofs where necessary. We use expressive examples to illustrate their application.

Kai Richter; Rolf Ernst

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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 CAD system for heterogeneous solid modelling  

Science Conference Proceedings (OSTI)

Objects that are made up of multiple materials and known as heterogeneous objects are now increasingly being used in engineering applications. The development of new fabrication methods like rapid prototyping (RP), calls for new techniques to ... Keywords: CAD model, STL file, functionally graded material, geometric information, heterogeneous models, heterogeneous solids, layered manufacturing, manufacturing strategy, material information, rapid prototyping, solid modelling

Puneet Tandon; Anuj Kant

2005-11-01T23:59:59.000Z

102

A CAD modeling system for heterogeneous object  

Science Conference Proceedings (OSTI)

A heterogeneous object (HO) modeling system independent of any commercial CAD packages is introduced in this paper. CAD models can be converted into 2D slices with heterogeneous material information for the fabrication of rapid prototyping technique. ... Keywords: CAD system, Heterogeneous object modeling, Volume graphics

Xiaojun Wu; Weijun Liu; Michael Yu Wang

2008-05-01T23:59:59.000Z

103

Do Investors Forecast Fat Firms? Evidence from the Gold Mining Industry  

E-Print Network (OSTI)

Economists’ Gold Price Forecasts,” Australian Journal ofDo Investors Forecast Fat Firms? Evidence from the Gold

Borenstein, Severin; Farrell, Joseph

2006-01-01T23:59:59.000Z

104

Pre-Entry Knowledge, Learning, and the Survival of New Firms  

Science Conference Proceedings (OSTI)

New firms are endowed with knowledge and experience at birth through the human capital of their founder(s). Existing empirical research suggests that this pre-entry knowledge and experience will influence the firm's chances of survival; however, the ... Keywords: adaptation, business planning, entrepreneurship, evolutionary economics, firm survival, human capital, knowledge, learning, prior experience, unemployment

John C. Dencker; Marc Gruber; Sonali K. Shah

2009-05-01T23:59:59.000Z

105

Computer Aided Design Modeling for Heterogeneous Objects  

E-Print Network (OSTI)

Heterogeneous object design is an active research area in recent years. The conventional CAD modeling approaches only provide geometry and topology of the object, but do not contain any information with regard to the materials of the object and so can not be used for the fabrication of heterogeneous objects (HO) through rapid prototyping. Current research focuses on computer-aided design issues in heterogeneous object design. A new CAD modeling approach is proposed to integrate the material information into geometric regions thus model the material distributions in the heterogeneous object. The gradient references are used to represent the complex geometry heterogeneous objects which have simultaneous geometry intricacies and accurate material distributions. The gradient references helps in flexible manipulability and control to heterogeneous objects, which guarantees the local control over gradient regions of developed heterogeneous objects. A systematic approach on data flow, processing, computer visualizat...

Gupta, Vikas; Tandon, Puneet

2010-01-01T23:59:59.000Z

106

Firm Racial Segregation and Affirmative Action in the Highway Construction Industry  

E-Print Network (OSTI)

In this paper I document that highway construction firms in California, particularly those owned by Blacks and Asians, exhibit considerable racial segregation in that they are disproportionately located in zip codes with the greatest concentration of own-race residents. I find that segregated firms serve a larger market than minority-owned firms that are not segregated, and this effect is concentrated in Black-owned firms. I next exploit the segregation of firms to examine the effect of affirmative action on the success of minority-owned firms. Following the significant curtailment of affirmative action in California due to a direct statewide ballot initiative, the number of highway construction establishments located in zip codes with the highest concentrations of Black and Asian residents fell relative to the rest of the state, even conditional on the number of non-construction establishments. This suggests that affirmative action policies may play a role in the net survival rates of minority-owned firms.

Justin Marion

2008-01-01T23:59:59.000Z

107

Koizumi stands firm to Chirac on Japan hosting nuclear project Prime Minister Junichiro Koizumi said Sunday that Japan stood firm in its attempt to host a  

E-Print Network (OSTI)

Koizumi said Sunday that Japan stood firm in its attempt to host a revolutionary nuclear reactor, amid EUKoizumi stands firm to Chirac on Japan hosting nuclear project 27/03/2005 Prime Minister Junichiro Jacques Chirac discussed the deadlock over the International Thermonuclear Experimental Reactor (ITER

108

Price Variation Antagonism and Firm Pricing Policies 1,2  

E-Print Network (OSTI)

Abstract: Pricing schemes that vary prices in response to demand shocks may antagonize consumers and reduce demand. At the same time, consumers may take advantage of the opportunities offered by price changes. Overall, the net impact of varying price on demand is ambiguous. We investigate the issue empirically, exploiting a unique dataset from a firm that has experimented with different pricing schemes. Each scheme is characterized by how much prices respond to demand variations. Holding average price and other variables constant, we find that demand is higher when prices vary more. We discuss the implications of our findings with regard to the consumer antagonism hypothesis.

Pascal Courty; Mario Pagliero; Jel D; Christopher Milde; Frank Vella; All Introduction

2008-01-01T23:59:59.000Z

109

Heterogeneous Catalyst for Improved Selectivity of Biomass ...  

Technology Marketing Summary. In today’s industrial processes, heterogeneous catalysts are widely used because of their stability and ease of ...

110

Financial constraints and firms' investment: results of a natural experiment measuring firm response to power interruption  

E-Print Network (OSTI)

as a natural experiment to reveal the e¤ect of ?nancing constraints on ?rms?ability to substitute speci?cally for de?cient public services and more generally to acquired complementary capital. The analysis of the ?rm-level data from Sub-Saharan Africa... shows that, controlling for other factors, ?rms with a better access to credit are also more likely to invest into private substitutes when public services are de?cient. Consistent with the predictions of the theoretical model these ?ndings indicate...

Steinbuks, J

111

HETEROGENEOUS REBURNING BY MIXED FUELS  

SciTech Connect

Recent studies of heterogeneous reburning, i.e., reburning involving a coal-derived char, have elucidated its variables, kinetics and mechanisms that are valuable to the development of a highly efficient reburning process. Young lignite chars contain catalysts that not only reduce NO, but they also reduce HCN that is an important intermediate that recycles to NO in the burnout zone. Gaseous CO scavenges the surface oxides that are formed during NO reduction, regenerating the active sites on the char surface. Based on this mechanistic information, cost-effective mixed fuels containing these multiple features has been designed and tested in a simulated reburning apparatus. Remarkably high reduction of NO and HCN has been observed and it is anticipated that mixed fuel will remove 85% of NO in a three-stage reburning process.

Wei-Yin Chen; Benson B. Gathitu

2005-01-14T23:59:59.000Z

112

Surface science and heterogeneous catalysis  

DOE Green Energy (OSTI)

The catalytic reactions studied include hydrocarbon conversion over platinum, the transition metal-catalyzed hydrogenation of carbon monoxide, and the photocatalyzed dissociation of water over oxide surfaces. The method of combined surface science and catalytic studies is similar to those used in synthetic organic chemistry. The single-crystal models for the working catalyst are compared with real catalysts by comparing the rates of cyclopropane ring opening on platinum and the hydrogenation of carbon monoxide on rhodium single crystal surface with those on practical commercial catalyst systems. Excellent agreement was obtained for these reactions. This document reviews what was learned about heterogeneous catalysis from these surface science approaches over the past 15 years and present models of the active catalyst surface.

Somorjai, G.A.

1980-05-01T23:59:59.000Z

113

Heterogeneities in the Glassy State  

E-Print Network (OSTI)

We study heterogeneities in a binary Lennard-Jones system below the glass transition using molecular dynamics simulations. We identify mobile and immobile particles and measure their distribution of vibrational amplitudes. For temperatures near the glass transition the distribution of vibrational amplitudes obeys scaling and compares reasonably well with a mean field theory for the amorphous solid state. To investigate correlations among the immobile and mobile particles we identify clusters and analyze their size and shape. For a fixed number of immobile particles we observe that the immobile particles cluster more strongly together as the temperature is increased which allows the particles to block each other more effectively, and to therefore stay immobile. For the mobile particles, on the other hand, the clustering is most pronounced at small temperatures, indicating that mobility at low temperatures can only be sustained in cooperative motion.

Katharina Vollmayr-Lee; Annette Zippelius

2005-07-05T23:59:59.000Z

114

Heterogeneous CPU Services Using Differentiated Admission Control  

Science Conference Proceedings (OSTI)

We present an adaptive rate-controlled scheduler for heterogeneous applications running on general purpose computers. Our scheduler can effectively support diverse application requirements. It employs uniform rate-based sharing. Application heterogeneity ... Keywords: CPU scheduling, admission control, firewall protection, multimedia operating system, priority inversion, rate-based sharing

David K. Y. Yau; Bharat Bhargava

2002-07-01T23:59:59.000Z

115

Financial liberalisation and the capital structure of firms listed on the Johannesburg stock exchange.  

E-Print Network (OSTI)

??This thesis examines the impact of financial liberalisation on the capital structure of non-financial firms listed on the Johannesburg Stock Exchange (JSE). The research hypotheses… (more)

Chipeta, Chimwemwe

2012-01-01T23:59:59.000Z

116

The Impacts of IT on Firm and Industry Stucture: The Personal Computer Industry  

E-Print Network (OSTI)

company reports and industry averages, ,to Rapid Change in the PC Industry,” California ManagementImpacts of IT on Firm and Industry Structure: The Personal

Dedrick, Jason; Kraemer, Kenneth L

2005-01-01T23:59:59.000Z

117

Offshore Wind Power - Opportunity and strategy for a small engineering consultants firm.  

E-Print Network (OSTI)

??GVA is a small engineering consultancy firm, with specialized focus in design of floating structures such as oil production platforms. The key business is at… (more)

Jobson Sellström, Carin

2010-01-01T23:59:59.000Z

118

When Do Firms Hire Lobbyists? The Organization of Lobbying at the Federal Communications Commission  

E-Print Network (OSTI)

This paper examines the explanatory power of transaction cost economics to explain vertical integration decisions for lobbying by firms. We examine 150 lobbying contacts at the Federal Communications ...

de Figueiredo, John

2004-12-10T23:59:59.000Z

119

Exploring the Relationship Between R&D and Productivity at the Firm Level in French Manufacturing  

E-Print Network (OSTI)

in Z . Griliches (ed. ), R&D, Patents, and Productivity.Z v i . 1986. "Productivity, R&D, and Basic Research at thein Z . Griliches (ed. ), R&D, Patents, and Productivity.

Hall, Bronwyn H.; Mairesse, Jacques

1992-01-01T23:59:59.000Z

120

Investment and Research and Development at the Firm Level: Does the Source of Financing Matter?  

E-Print Network (OSTI)

higher "knowledge" capital intensities and higher debt tocorrelation between R & D capital intensity and the debt-Capital ratio R & D Capital intensity Sales-Capital ratio

Hall, Bronwyn H.

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

SF6432-FP (02-01-12) Firm Fixed Price  

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

2/01/12 2/01/12 Page 1 of 21 Printed copies of this document are uncontrolled. Retrieve latest version electronically. SANDIA CORPORATION SF 6432-FP (02/01/12) Section II STANDARD TERMS AND CONDITIONS FOR FIRM-FIXED PRICE CONTRACTS THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE COVER PAGE OR SECTION I. (CTRL+CLICK ON A LINK BELOW TO ADVANCE DIRECTLY TO THAT SECTION) ACCEPTANCE OF TERMS AND CONDITIONS (Ts&Cs) APPLICABLE LAW ASSIGNMENT BANKRUPTCY DEFINITIONS DISPUTES EXCESS FREIGHT CHARGES EXCUSABLE DELAYS EXPORT CONTROL EXTRAS AND VARIATION IN QUANTITY GOVERNMENT PROPERTY MATERIAL AND EQUIPMENT MANUFACTURING AND TESTING STANDARDS

122

Foreign firms to get equal opportunity in Mexican selloff plans  

SciTech Connect

Petroleos Mexicanos (Pemex) has not finalized details of its long-awaited petrochemical privatization program. However, the state oil group has made it clear the selloff schedule, due to begin during the next two months, will give equal investment opportunity to foreign firms, dashing the hopes of Mexican groups that they would be given first right of refusal in the privatization program. Meanwhile, Pemex has agreed with Shell Oil on a previously announced refining joint venture involving Shell's 225,000-bbl/day refinery at Deer Park, TX. Under the plan, Pemex will purchase a 50% stake in the refinery and join Shell in a $1-billion upgrade with would enable it to handle more Mexican crude. Sources believe that Shell and other US oil groups are interested in acquiring assets from Pemex Petroquimica.

Wood, A.; Alvarez, C.

1993-03-17T23:59:59.000Z

123

Gradually Truncated Log-normal distribution- Size distribution of firms  

E-Print Network (OSTI)

Many natural and economical phenomena are described through power law or log-normal distributions. In these cases, probability decreases very slowly with step size compared to normal distribution. Thus it is essential to cut-off these distributions for larger step size. Recently we introduce the gradually truncated power law distribution to successfully describe variation of financial, educational, physical and citation index. In the present work, we introduce gradually truncated log-normal distribution in which we gradually cut-off larger steps due to physical limitation of the system. We applied this distribution successfully to size distribution of USA´s manufactoring firms which is measured through their annual sell. The physical limitation are due to limited market size or shortage of highly competent executives. I.

Hari M. Gupta; José R. Campanha

2008-01-01T23:59:59.000Z

124

Model Catalysts: Simulating the Complexities of Heterogeneous Catalysts  

Science Conference Proceedings (OSTI)

Surface-science investigations have contributed significantly to heterogeneous catalysis in the past several decades. Fundamental studies of reactive systems on metal single crystals have aided researchers in understanding the effect of surface structure on catalyst reactivity and selectivity for a number of important reactions. Recently, model systems, consisting of metal clusters deposited on planar oxide surfaces, have facilitated the study of metal particle-size and support effects. These model systems not only are useful for carrying out kinetic investigations, but are also amenable to surface spectroscopic techniques, thus enabling investigations under realistic pressures and at working temperatures. By combining surface-science characterization methods with kinetic measurements under realistic working conditions, researchers are continuing to advance the molecular-level understanding of heterogeneous catalysis and are narrowing he pressure and material gap between model and real-world catalysts.

Gao, Feng; Goodman, D. W.

2012-05-01T23:59:59.000Z

125

A Comparison of WD-EPMA Heterogeneity Testing ...  

Science Conference Proceedings (OSTI)

A Comparison of WD-EPMA Heterogeneity Testing Procedures. Summary: The heterogeneity of the four elements in a TiAl ...

2012-10-02T23:59:59.000Z

126

Recruiting for Ideas: How Firms Exploit the Prior Inventions of New Hires  

Science Conference Proceedings (OSTI)

When firms recruit inventors, they acquire not only the use of their skills but also enhanced access to their stock of ideas. But do hiring firms actually increase their use of new recruits' prior inventions? Our estimates suggest they do, quite significantly ... Keywords: access to ideas, coarsened exact matching, collaborative networks, difference in differences, inventor mobility, knowledge spillovers, learning by hiring, patent citations

Jasjit Singh; Ajay Agrawal

2011-01-01T23:59:59.000Z

127

Firm-based Measurements of Market Power in Transmission-Constrained Electricity  

E-Print Network (OSTI)

Firm-based Measurements of Market Power in Transmission-Constrained Electricity Markets: Technical: Transmission constraints, electricity markets, market power, market power index, residual supply index. 1 approaches to analyzing firm-based market power con- sidering transmission constraints are proposed. One

Baldick, Ross

128

A New Approach for Firm Value and Default Probability Estimation beyond Merton Models  

Science Conference Proceedings (OSTI)

In this paper we present a new model to assess the firm value and the default probability by using a bivariate contingent claim analysis and copula theory. First we discuss an unfeasible case, given the current derivative market on corporate bonds, which ... Keywords: Bivariate option, Copula, Firm value, G12, G30, G32, No arbitrage, Structural models

Maria Elena Giuli; Dean Fantazzini; Mario Alessandro Maggi

2008-03-01T23:59:59.000Z

129

An elusive antecedent of superior firm performance: The knowledge management factor  

Science Conference Proceedings (OSTI)

Knowledge management (KM) concepts, principles, and technologies provide a foundation for understanding and building systems for acquiring, assimilating, selecting, generating, and emitting knowledge-a crucial resource of the firm. In the knowledge management ... Keywords: COMPUSTAT, Financial performance, Firm performance, KM, Knowledge management, Resource-based theory

Clyde W. Holsapple; Jiming Wu

2011-12-01T23:59:59.000Z

130

Detecting information technology impact on firm performance using DEA and decision tree  

Science Conference Proceedings (OSTI)

In a modern organisation, it is crucial and common for managers to effectively detect the impact of Information Technology (IT) on firm performance. This allows companies to maintain a competitive edge in rapidly changing business environments ... Keywords: DEA, IT impact, classification, data envelopment analysis, decision tree, decison making, firm performance, information technology, organisational performance

Desheng Wu

2006-06-01T23:59:59.000Z

131

Shaping agility through digital options: reconceptualizing the role of information technology in contemporary firms  

Science Conference Proceedings (OSTI)

Agility is vital to the innovation and competitive performance of firms in contemporary business environments. Firms are increasingly relying on information technologies, including process, knowledge, and communication technologies, to enhance their ... Keywords: IT competence, digital options, knowledge capital, process capital, strategic agility

V. Sambamurthy; Anandhi Bharadwaj; Varun Grover

2003-06-01T23:59:59.000Z

132

Wall Street vs. Main Street: Firm Strategies for Defending Legitimacy and Their Impact on Different Stakeholders  

Science Conference Proceedings (OSTI)

We assess the effect of firm strategies to defend legitimacy on two different stakeholder groups—the public (“Main Street”) and the investment community (“Wall Street”). We identify four types of firm strategies in response ... Keywords: crisis response, legitimacy, stakeholder theory, stigma management, thought worlds

Anna Lamin; Srilata Zaheer

2012-01-01T23:59:59.000Z

133

Firm Size Transmission Effect and Price-Volume Relationship Analysis During Financial Tsunami Periods  

Science Conference Proceedings (OSTI)

Investors attend importance to forecast the price of financial assets, thus, the factors affecting the stock price are usually the focus of financial research in the field, in which the most important factors to scholars are firm size transmission effect ... Keywords: Cointegration Test, Firm Size Transmission Effect, Granger-Causality Test, Price-Volume Relationship, Unit Root Test

Wei-Chiang Samuelson Hong; Shih-Yung Wei; Kai Wang

2011-07-01T23:59:59.000Z

134

Firm-Created Word-of-Mouth Communication: Evidence from a Field Test  

Science Conference Proceedings (OSTI)

In this paper, we investigate the effectiveness of a firm's proactive management of customer-to-customer communication. We are particularly interested in understanding how, if at all, the firm should go about effecting meaningful word-of-mouth (WOM) ... Keywords: advertising, promotion, word of mouth

David Godes; Dina Mayzlin

2009-07-01T23:59:59.000Z

135

Firms' information security investment decisions: Stock market evidence of investors' behavior  

Science Conference Proceedings (OSTI)

In the information society, it is important for firms to manage their core information resources securely. However, the difficulty of measuring the return on an IT security investment is one of the critical obstacles for firms in making such investment ... Keywords: Abnormal returns, Event methodology, Information security investment, Investors' behavior, Market value, Sarbanes-Oxley Act (SOX)

Sangmi Chai; Minkyun Kim; H. Raghav Rao

2011-03-01T23:59:59.000Z

136

Reconciling Semantic Heterogeneity in Web Services Composition  

E-Print Network (OSTI)

Service Oriented Computing (SOC) is a popular computing paradigm for the development of distributed Web applications. Service composition, a key element of SOC, is severely hampered by various types of semantic heterogeneity ...

Li, Xitong

137

Percolation and homogenization theories for heterogeneous materials  

E-Print Network (OSTI)

Most materials produced by Nature and by human beings are heterogeneous. They contain domains of different states, structures, compositions, or material phases. How these different domains are distributed in space, or in ...

Chen, Ying, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

138

Static LU Decomposition on Heterogeneous Platforms  

Science Conference Proceedings (OSTI)

In this paper, the authors deal with algorithmic issues on heterogeneous platforms. They concentrate on dense linear algebra kernels, such as matrix multiplication or LU decomposition. Block-cyclic distribution techniques used in ScaLAPACK are no longer ...

Olivier Beaumont; Arnaud Legrand; Fabrice Rastello; Yves Robert

2001-08-01T23:59:59.000Z

139

Trainers by design : a case study of inter-firm learning, institution building and local governance in western Mexico  

E-Print Network (OSTI)

Studies of international economic development often feature the competitive gains from inter-firm cooperation. By cooperating, firms within a region can draw on their collective resources and experience to test out new ...

Lowe, Nichola J

2003-01-01T23:59:59.000Z

140

Consumption Externalities: A Representative Consumer Model when Agents are Heterogeneous *  

E-Print Network (OSTI)

Abstract: We examine a growth model with consumption externalities where agents differ in their initial capital endowment and their reference group. We show under which conditions the aggregate equilibrium with heterogeneous agents replicates that obtained with a representative consumer, despite the fact that different individuals have different consumption levels. Next we consider the implications of the presence of consumption externalities for the long-run distributions of income and wealth. We find that, in a growing economy, “keeping up with the Joneses ” results in less inequality than would prevail in an economy with no consumption externalities.

Cecilia García-peñalosa; Stephen J. Turnovsky

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Firm Size and Industry Structure Under Human Capital Intensity: Insights from the Evolution of the Global Advertising Industry  

Science Conference Proceedings (OSTI)

Although existing literature assumes that the human capital intensity of professional services leads to small and flimsy firms, several professional services feature large, long-lived firms. To develop insights about firm size and industry structure ... Keywords: advertising agencies, financial intermediation, human capital, industry evolution, industry structure, professional services, vertical differentiation

Andrew von Nordenflycht

2011-01-01T23:59:59.000Z

142

Measuring the relative efficiency of IC design firms using the directional distance function and a meta-frontier approach  

Science Conference Proceedings (OSTI)

This paper presents an alternative approach for evaluating the efficiency of integrated circuit (IC) design firms. In doing so, it accounts for differences between technology groups containing one or more design firms, and input and output factors to ... Keywords: Directional distance function, Group-frontier, IC design firm, Meta-frontier, Performance evaluations

Bo Hsiao; Ching-Chin Chern; Ming-Miin Yu

2012-11-01T23:59:59.000Z

143

Please Hold Me UP: Why Firms Grant Exclusive-Dealing Contracts  

E-Print Network (OSTI)

Why do irreplaceable firms with a choice of suppliers or customers deliberately expose themselves to the threat of hold up by contracting ex ante to deal with only one of them? Our explanation revolves around the multiple equilibria intrinsic to situations of unverifiable investment and many traders. Exclusive dealing eliminates inecient equilibria in which too many firms invest too little. The enhanced ex post bargaining power of the chosen Þrm is beneficial for incentives whilst the distributional impact is more than oset in the ex ante negotiations over which this firm obtains the access privelege.

David de Meza; Marianno Selvaggi

2003-01-01T23:59:59.000Z

144

Wetting of a Chemically Heterogeneous Surface  

Science Conference Proceedings (OSTI)

Theories for inhomogeneous fluids have focused in recent years on wetting, capillary conden- sation, and solvation forces for model systems where the surface(s) is(are) smooth homogeneous parallel plates, cylinders, or spherical drops. Unfortunately natural systems are more likely to be hetaogeneous both in surt%ce shape and surface chemistry. In this paper we discuss the conse- quences of chemical heterogeneity on wetting. Specifically, a 2-dimensional implementation of a nonlocal density functional theory is solved for a striped surface model. Both the strength and range of the heterogeneity are varied. Contact angles are calculated, and phase transitions (both the wetting transition and a local layering transition) are located. The wetting properties of the surface ase shown to be strongly dependent on the nature of the surface heterogeneity. In addition highly ordered nanoscopic phases are found, and the operational limits for formation of ordered or crystalline phases of nanoscopic extent are discussed.

Frink, L.J.D.; Salinger, A.G.

1998-11-20T23:59:59.000Z

145

Secretary Chu to Tour Leading Solar Firm in Boston Area | Department of  

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

Tour Leading Solar Firm in Boston Area Tour Leading Solar Firm in Boston Area Secretary Chu to Tour Leading Solar Firm in Boston Area December 1, 2010 - 12:00am Addthis Washington, DC - On Thursday, December 2, 2010, US Energy Secretary Steven Chu will be joined by Dr. Arun Majumdar, ARPA-E Director, to tour 1366 Technologies, a leading solar technology firm that is developing more cost efficient solar panels. 1366 received a $4 million Recovery Act grant through the Department of Energy's Advance Research Project Agency-Energy (ARPA-E) program in October 2009. 1366 is a shining star, real example showcasing Boston as a leader in the clean energy sector. Since receiving the Recovery Act funds 1366 Technologies has made rapid technical progress towards its goal of halving the cost of solar energy. It has also hired 15

146

U.S. Department of Energy Selects Venture Capital Firms to Accelerate  

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

Venture Capital Firms to Venture Capital Firms to Accelerate Adoption of Advanced Energy Technologies U.S. Department of Energy Selects Venture Capital Firms to Accelerate Adoption of Advanced Energy Technologies February 27, 2008 - 11:43am Addthis SAN FRANCISCO, CA - U.S. Department of Energy (DOE) Assistant Secretary for Energy Efficiency and Renewable Energy Alexander Karsner today announced the competitive selection of three venture capital firms to participate in DOE's newly established Entrepreneur in Residence (EIR) pilot program, which aims to accelerate deployment and commercialization of advanced clean energy technologies from three DOE National Laboratories into the global marketplace. The EIR pilot program furthers President Bush's comprehensive strategy to reduce our nation's dependence on foreign oil and

147

Secretary Chu to Tour Leading Solar Firm in Boston Area | Department of  

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

Secretary Chu to Tour Leading Solar Firm in Boston Area Secretary Chu to Tour Leading Solar Firm in Boston Area Secretary Chu to Tour Leading Solar Firm in Boston Area December 1, 2010 - 12:00am Addthis Washington, DC - On Thursday, December 2, 2010, US Energy Secretary Steven Chu will be joined by Dr. Arun Majumdar, ARPA-E Director, to tour 1366 Technologies, a leading solar technology firm that is developing more cost efficient solar panels. 1366 received a $4 million Recovery Act grant through the Department of Energy's Advance Research Project Agency-Energy (ARPA-E) program in October 2009. 1366 is a shining star, real example showcasing Boston as a leader in the clean energy sector. Since receiving the Recovery Act funds 1366 Technologies has made rapid technical progress towards its goal of halving the cost of solar energy. It has also hired 15

148

Organization and Information: Firms' Governance Choices in Rational-expectations Equilibrium  

E-Print Network (OSTI)

We analyze a rational-expectations model of price formation in an intermediate-good market under uncertainty. There is a continuum of firms, each consisting of a party who can reduce production cost and a party who can ...

Gibbons, Robert S.

149

What is the value of logistics for a large pharmaceutical firm?  

E-Print Network (OSTI)

Understanding business needs arising out of both, external and internal environments, is an essential first step in determining the value of logistics in a large pharmaceutical firm. In this research, we have used a variety ...

Tiwari, Prasoon, M. Eng. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

150

Material scarcity from the perspective of manufacturing firms : case studies of platinum and cobalt  

E-Print Network (OSTI)

Many agree that materials availability, especially non-renewable materials, is an issue of global concern. However, the implications and strategy options for manufacturing firms are not obvious. Manufacturers select materials ...

Alonso, Elisa (Elisa Yun Han)

2010-01-01T23:59:59.000Z

151

How Sales Taxes Affect Customer and Firm Behavior: The Role of Search on the Internet  

E-Print Network (OSTI)

When a multichannel retailer opens its first retail store in a state, the firm is obligated to collect sales taxes on all Internet and catalog orders shipped to that state. This article assesses how opening a store affects ...

Anderson, Eric T.

152

Mediating regional development : how metalworking firms forged lasting linkages with steel in Ciudad, Guayana, Venezuela  

E-Print Network (OSTI)

Ever since the late 1950s, planners have lured large firms to lagging regions with the expectation that they will trigger local industrial activity. According to the literatures on unbalanced growth, growth poles, foreign ...

Döhnert, Sylvia, 1970-

2003-01-01T23:59:59.000Z

153

The strategic use of an information system in supporting architectural design decisions for a design firm  

E-Print Network (OSTI)

This thesis is to illustrate how a computer-based information system for supporting decision making, that is a Decision Support System (DSS), can be utilized as a strategic tool in architectural design for a firm. The ...

Liu, Lu, M.S. Massachusetts Institute of Technology

1985-01-01T23:59:59.000Z

154

How to transition Chinese firms into world-class corporations : organizational and cultural innovations are key  

E-Print Network (OSTI)

Entering the 21st Century, after almost 30 years development of the Chinese economy, several famous Chinese firms have grown to a significant scale and achieved the rudiments of world-class corporations. Following Japanese ...

Zhao, Zhongyao (Zhongyao Charls)

2007-01-01T23:59:59.000Z

155

Selection of infectious medical waste disposal firms by using the analytic hierarchy process and sensitivity analysis  

SciTech Connect

While Taiwanese hospitals dispose of large amounts of medical waste to ensure sanitation and personal hygiene, doing so inefficiently creates potential environmental hazards and increases operational expenses. However, hospitals lack objective criteria to select the most appropriate waste disposal firm and evaluate its performance, instead relying on their own subjective judgment and previous experiences. Therefore, this work presents an analytic hierarchy process (AHP) method to objectively select medical waste disposal firms based on the results of interviews with experts in the field, thus reducing overhead costs and enhancing medical waste management. An appropriate weight criterion based on AHP is derived to assess the effectiveness of medical waste disposal firms. The proposed AHP-based method offers a more efficient and precise means of selecting medical waste firms than subjective assessment methods do, thus reducing the potential risks for hospitals. Analysis results indicate that the medical sector selects the most appropriate infectious medical waste disposal firm based on the following rank: matching degree, contractor's qualifications, contractor's service capability, contractor's equipment and economic factors. By providing hospitals with an effective means of evaluating medical waste disposal firms, the proposed AHP method can reduce overhead costs and enable medical waste management to understand the market demand in the health sector. Moreover, performed through use of Expert Choice software, sensitivity analysis can survey the criterion weight of the degree of influence with an alternative hierarchy.

Hsu, P.-F. [Department of Communications Management, Shih Hsin University, No.1, Lane 17, Mu-Cha Road, Sec.1, Taipei 11604, Taiwan (China)], E-mail: celina9@ms26.hinet.net; Wu, C.-R. [Graduate Institute of Business and Management, Yuanpei University, 306 Yuanpei Street, Hsin Chu 300, Taiwan (China)], E-mail: alexru00@ms41.hinet.net; Li, Y.-T. [Graduate Institute of Business and Management, Yuanpei University, 306 Yuanpei Street, Hsin Chu 300, Taiwan (China)], E-mail: ting.ding@msa.hinet.net

2008-07-01T23:59:59.000Z

156

Error resilient video streaming for heterogeneous networks  

Science Conference Proceedings (OSTI)

We consider the problem of video streaming for a critical private web cast, for a medium sized audience with heterogeneous nodes having different bandwidths and reliabilities. The nodes can distribute video in a peer-to-peer manner by forming a multicast ... Keywords: error resilience, multiple description coding (MDC), path diversity, video streaming

Divyashikha Sethia; Huzur Saran

2006-12-01T23:59:59.000Z

157

Architecture for mobile Heterogeneous Multi Domain networks  

Science Conference Proceedings (OSTI)

Multi domain networks can be used in several scenarios including military, enterprize networks, emergency networks and many other cases. In such networks, each domain might be under its own administration. Therefore, the cooperation among domains is ... Keywords: Network architecture, heterogeneous networks, mobility, policy based networking

Arjan Durresi; Ping Zhang; Mimoza Durresi; Leonard Barolli

2010-01-01T23:59:59.000Z

158

Plenary lecture 2: nanotechnology and heterogeneous catalysis  

Science Conference Proceedings (OSTI)

Catalysis is the process in which the rate of a chemical reaction is increased by means of a chemical substance known as a catalyst. Catalysts can be either heterogeneous or homogeneous, depending on whether a catalyst exists in the same phase as the ...

Karim H. Hassan

2009-02-01T23:59:59.000Z

159

Real time video streaming over heterogeneous networks  

Science Conference Proceedings (OSTI)

Technological advances allow handheld devices to be equipped with faster processors and wireless interfaces, making the performance comparable to laptop Computers. In this paper, we describe real-time video streaming over heterogeneous networks namely ... Keywords: GPRS-EDGE, IEEE802.11, IETF, MPEG-4, PSS, RTCP, RTP, RTSP, bluetooth, performance, piconet, quality of service, video streaming, wireless LANs

Mohammed A. Qadeer; Rehan Ahmad; Mohd Siddique Khan; Tauseef Ahmad

2009-02-01T23:59:59.000Z

160

Multiscale not multicore: efficient heterogeneous cloud computing  

Science Conference Proceedings (OSTI)

In this paper, we present a vision of the future of heterogeneous cloud computing. Ours is a cleanslate approach, sweeping away decades of accreted system software. We believe the advent of the latest technology discontinuity---the move to the virtual ...

Anil Madhavapeddy; Richard Mortier; Jon Crowcroft; Steven Hand

2010-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

A Metering Infrastructure for Heterogenous Mobile Networks  

E-Print Network (OSTI)

A Metering Infrastructure for Heterogenous Mobile Networks Andreas Monger, Marc Fouquet, Christian decision engines is costly in terms of bandwidth. With our flexible Generic Metering Infrastructure (GMI-assisted handovers. We present the Generic Metering Infrastructure (GMI) that #12;is able to provide decision making

Carle, Georg

162

Freezing Rate Due to Heterogeneous Nucleation  

Science Conference Proceedings (OSTI)

The heterogeneous nucleation of ice from supercooled water is influenced by the nature of the foreign nuclei that serve as the sites for ice embryo formation, and by the stochastic nature of the process of embryo growth to critical size. The ...

Gabor Vali

1994-07-01T23:59:59.000Z

163

Why Put All Your Eggs in One Basket? A Competition-Based View of How Technological Uncertainty Affects a Firm’s Technological Specialization  

Science Conference Proceedings (OSTI)

Conventional wisdom suggests that when a firm faces technological uncertainty, it responds by becoming less technologically specialized so as to remain adaptable to subsequent resolution of this uncertainty. We adopt a competition-based view of technological ... Keywords: competition, innovation, technological specialization, technological uncertainty

Puay Khoon Toh; Taekyu Kim

2013-07-01T23:59:59.000Z

164

Characterization of oil and gas reservoir heterogeneity  

SciTech Connect

Research described In this report addresses the internal architecture of two specific reservoir types: restricted-platform carbonates and fluvial-deltaic sandstones. Together, these two reservoir types contain more than two-thirds of the unrecovered mobile oil remaining ill Texas. The approach followed in this study was to develop a strong understanding of the styles of heterogeneity of these reservoir types based on a detailed outcrop description and a translation of these findings into optimized recovery strategies in select subsurface analogs. Research targeted Grayburg Formation restricted-platform carbonate outcrops along the Algerita Escarpment and In Stone Canyon In southeastern New Mexico and Ferron deltaic sandstones in central Utah as analogs for the North Foster (Grayburg) and Lake Creek (Wilcox) units, respectively. In both settings, sequence-stratigraphic style profoundly influenced between-well architectural fabric and permeability structure. It is concluded that reservoirs of different depositional origins can therefore be categorized Into a heterogeneity matrix'' based on varying intensity of vertical and lateral heterogeneity. The utility of the matrix is that it allows prediction of the nature and location of remaining mobile oil. Highly stratified reservoirs such as the Grayburg, for example, will contain a large proportion of vertically bypassed oil; thus, an appropriate recovery strategy will be waterflood optimization and profile modification. Laterally heterogeneous reservoirs such as deltaic distributary systems would benefit from targeted infill drilling (possibly with horizontal wells) and improved areal sweep efficiency. Potential for advanced recovery of remaining mobile oil through heterogeneity-based advanced secondary recovery strategies In Texas is projected to be an Incremental 16 Bbbl. In the Lower 48 States this target may be as much as 45 Bbbl at low to moderate oil prices over the near- to mid-term.

Tyler, N.; Barton, M.D.; Bebout, D.G.; Fisher, R.S.; Grigsby, J.D.; Guevara, E.; Holtz, M.; Kerans, C.; Nance, H.S.; Levey, R.A.

1992-10-01T23:59:59.000Z

165

The Effects Of Port Security Compliance On The Competitiveness Of European Union Maritime Industry Firms  

E-Print Network (OSTI)

ABSTRACT The Effects Of Port Security Compliance On The Competitiveness Of European Union Maritime Industry Firms. (May 2013) Jonathan Stone Department of Maritime Administration Texas A&M University Research Advisor: Dr. Joan Mileski Department of Maritime Administration Prior research has addressed European Union (EU) water transportation policy and its impact on firm strategy. We extend this research by attempting to measure the effect of port security regulation compliance implementation on the perceived competitiveness of maritime firms located in European Union ports. We ask the question: Can firm specific implementation of required port security compliance enhance or hinder a firm’s competitive advantage? We use Resource-Based Strategic Theory as a framework for evaluating competitiveness. Resource based theory purports that assets and systems can give a firm a competitive advantage if they follow the “VRIN” criteria of Valuable, Rare, Inimitable, and Not easily substitutable. We ask via email and snail mail survey instrument whether certain security assets, resources and systems are “VRIN” and whether these assets, resources and systems give competitive advantage to the firm. The type of resources/assets/systems include physical assets such as fencing; ongoing management assets such as communication systems, planning and structuring management assets such as security planning systems; human assets such as employee knowledge; technological assets such as software protection; intangible assets such as a safety culture and financial assets such as cost savings from security compliance. We administer the instrument to all firms operating in EU ports in 2011-2012. A list of firms is obtained from IHSfairplay Ports and Terminals Guide. The results of the survey shows that most managers do not perceive a competitive advantage was gained in the way security assets/resources/management systems were implemented. However, a strong minority 34.12% of managers did perceive competitive advantage was gained from port security compliance where systems/assets/resources were not easily imitated or the “I.” Furthermore, managers perceive where they were located within the port as an important advantage to security and competitiveness.

Stone, Jonathan Taylor

2013-05-01T23:59:59.000Z

166

Balancing of Heterogeneity and Interoperability in E-Business Networks: The Role of Standards and Protocols  

Science Conference Proceedings (OSTI)

To reach this interoperability visibility and common understanding must be ensured on all levels of the interoperability pyramid. This includes common agreements about the visions, political and legal restrictions, clear descriptions about the collaboration ... Keywords: Advanced Web Technologies, E-Business Interoperability, Heterogeneity, Information Communication Systems, Standards

Frank-Dieter Dorloff; Ejub Kajan

2012-10-01T23:59:59.000Z

167

Scheduling Heterogeneous Delay Tolerant Tasks in Smart Grid with Renewable Energy  

E-Print Network (OSTI)

1 Scheduling Heterogeneous Delay Tolerant Tasks in Smart Grid with Renewable Energy Shengbo Chen sources of energy (e.g., harvested renewable energy), and allow for dynamic electricity price, or a business, which is equipped with renewable energy devices when electrical appliances allow different levels

Sinha, Prasun

168

Microgrids and Heterogeneous Power Quality and Reliability  

Science Conference Proceedings (OSTI)

This paper describes two stylized alternative visions of how the power system might evolve to meet future requirements for the high quality electricity service that modern digital economies demand, a supergrids paradigm and a dispersed paradigm. Some of the economics of the dispersed vision are explored, and perspectives are presented on both the choice of homogeneous universal power quality upstream in the electricity supply chain and on the extremely heterogeneous requirements of end-use loads. It is argued that meeting the demanding requirements of sensitive loads by local provision of high quality power may be more cost effective than increasing the quality of universal homogeneous supply upstream in the legacy grid. Finally, the potential role of microgrids in delivering heterogeneous power quality is demonstrated by reference to two ongoing microgrid tests in the U.S. and Japan.

LaCommare, Kristina; Marnay, Chris

2007-10-01T23:59:59.000Z

169

Dedicated heterogeneous node scheduling including backfill scheduling  

DOE Patents (OSTI)

A method and system for job backfill scheduling dedicated heterogeneous nodes in a multi-node computing environment. Heterogeneous nodes are grouped into homogeneous node sub-pools. For each sub-pool, a free node schedule (FNS) is created so that the number of to chart the free nodes over time. For each prioritized job, using the FNS of sub-pools having nodes useable by a particular job, to determine the earliest time range (ETR) capable of running the job. Once determined for a particular job, scheduling the job to run in that ETR. If the ETR determined for a lower priority job (LPJ) has a start time earlier than a higher priority job (HPJ), then the LPJ is scheduled in that ETR if it would not disturb the anticipated start times of any HPJ previously scheduled for a future time. Thus, efficient utilization and throughput of such computing environments may be increased by utilizing resources otherwise remaining idle.

Wood, Robert R. (Livermore, CA); Eckert, Philip D. (Livermore, CA); Hommes, Gregg (Pleasanton, CA)

2006-07-25T23:59:59.000Z

170

Reliability-aware scheduling strategy for heterogeneous distributed computing systems  

Science Conference Proceedings (OSTI)

Heterogeneous computing systems are promising computing platforms, since single parallel architecture based systems may not be sufficient to exploit the available parallelism with the running applications. In some cases, heterogeneous distributed computing ... Keywords: Duplication, Heterogeneous distributed systems, Precedence constrained tasks, Reliability, Scheduling algorithm

Xiaoyong Tang; Kenli Li; Renfa Li; Bharadwaj Veeravalli

2010-09-01T23:59:59.000Z

171

List scheduling with duplication for heterogeneous computing systems  

Science Conference Proceedings (OSTI)

Effective task scheduling is essential for obtaining high performance in heterogeneous computing systems (HCS). However, finding an effective task schedule in HCS, requires the consideration of the heterogeneity of computation and communication. To solve ... Keywords: DAG, Duplication, Heterogeneous computing systems, List scheduling

Xiaoyong Tang; Kenli Li; Guiping Liao; Renfa Li

2010-04-01T23:59:59.000Z

172

Experimental Analysis of Heterogeneous Wireless Networks  

E-Print Network (OSTI)

Packet loss and delay in Internet degrade the quality of requested services like VoIP (Voice over IP) or Video Streaming. In novel network scenarios where wired and wireless connections are melted together, a real measure of these parameters is fundamental in a planning process of new services over novel network infrastructures. Nowadays networks are heterogeneous in terms of access network technologies (wired LAN Ethernet 10/100/1000, Wireless LAN - 802.11a, 802.11b, 802.11g -, GPRS, UMTS, GSM, Bluetooth, ...), end-users' devices (workstation, PC desktop, Laptop/Notebook, PDA, Advanced Mobile Phone, ...) and finally operating systems (Unix, Linux, Win 98/NT/2000/XP, Win CE, Linux Familiar, OS Embedded, ...). In this work we provide a heterogeneous network performance characterization with respect to delay and throughput in UDP and TCP environments. In order to determine our results we use an innovative traffic generator named D-ITG (Distributed Internet Traffic Generator). Results presented in this paper can be used as performance references for development of wireless communication applications over multiservice and heterogeneous networks.

Giulio Iannello; Antonio Pescape; Giorgio Ventre; Luca Vollero

2004-01-01T23:59:59.000Z

173

Effects of Spatial and Temporal Heterogeneity of Channel Bandwidth on Performance of Individual Messages in Heterogeneous Communication Networks  

Science Conference Proceedings (OSTI)

Channel bandwidth available for a message on a communication network varies with time and link. This variation (heterogeneity) can have a significant effect on performance of an individual message and also that of the network as a whole. Therefore, it ... Keywords: Channel bandwidth, End-to-end delay, Multipath data transfer, Path selection, Spatial heterogeneity, Temporal heterogeneity, Throughput

Soo-Young Lee; Jun Huang

2004-08-01T23:59:59.000Z

174

Surface Characterization of Heterogeneous Catalysts Using Low Energy Ion Scattering Spectroscopy Combined with Electrochemistry  

E-Print Network (OSTI)

Fundamental studies of heterogeneous catalysis were performed and presented in this dissertation to gain a better understanding of heterogeneous catalytic reactions at a molecular level. Surface science techniques were employed in achieving the goal. Low energy ion scattering spectroscopy (LEISS) is the main surface science technique which will be used in all the studies discussed throughout this dissertation. The main objectives of LEISS measurements are to: 1) obtain the information of surface composition of heterogeneous catalysts from the topmost layer; 2) observe the effects of reaction conditions on the surface composition of heterogeneous catalysts. The surface composition and morphology of Au-Pd clusters bimetallic model catalysts supported on SiO2 were characterized using LEISS, infrared reflection absorption spectroscopy (IRAS), and temperature programmed desorption (TPD). It is observed that relative to the bulk, the surface of the clusters is enriched in Au. Ethylene adsorption and dehydrogenation show a clear structure-reactivity correlation with respect to the structure/composition of these Au-Pd model catalysts. Fundamental studies of heterogeneous catalysis were performed and presented in this dissertation to gain a better understanding of heterogeneous catalytic reactions at a molecular level. Surface science techniques were employed in achieving the goal. Low energy ion scattering spectroscopy (LEISS) is the main surface science technique which will be used in all the studies discussed throughout this dissertation. The main objectives of LEISS measurements are to: 1) obtain the information of surface composition of heterogeneous catalysts from the topmost layer; 2) observe the effects of reaction conditions on the surface composition of heterogeneous catalysts. The surface composition and morphology of Au-Pd clusters bimetallic model catalysts supported on SiO2 were characterized using LEISS, infrared reflection absorption spectroscopy (IRAS), and temperature programmed desorption (TPD). It is observed that relative to the bulk, the surface of the clusters is enriched in Au. Ethylene adsorption and dehydrogenation show a clear structure-reactivity correlation with respect to the structure/composition of these Au-Pd model catalysts.

Axnanda, Stephanus R.

2009-12-01T23:59:59.000Z

175

Development of Advanced Massive Heterogeneous Sensor Networks  

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

Advanced Massive Heterogeneous Sensor Networks Research Team * Doug McCorkle * Kris Bryden * Mark Bryden Ames Laboratory U of Maryland * Ashwani Gupta * Miao Yu Power Plant Challenges * Conflicting goals of reliable low cost energy and climate change mitigation * Large investment in current infrastructure * Little implementation of information technologies Sensors ... * will be "free" * will be small (lick 'n stick) * will be smart * will be ubiquitous Low cost improvements in sensing for control and condition monitoring can result in big improvements in cost and carbon emissions * "... develop the understandings, algorithms, and control strategies needed to utilize large-scale, high- density sensor networks in advanced power plants." * Develop techniques for the

176

Markovian Search Games in Heterogeneous Spaces  

SciTech Connect

We consider how to search for a mobile evader in a large heterogeneous region when sensors are used for detection. Sensors are modeled using probability of detection. Due to environmental effects, this probability will not be constant over the entire region. We map this problem to a graph search problem and, even though deterministic graph search is NP-complete, we derive a tractable, optimal, probabilistic search strategy. We do this by defining the problem as a differential game played on a Markov chain. We prove that this strategy is optimal in the sense of Nash. Simulations of an example problem illustrate our approach and verify our claims.

Griffin, Christopher H [ORNL

2009-01-01T23:59:59.000Z

177

TEXAS SALES AND USE TAX EXEMPTION CERTIFICATION Name of purchaser, firm or agency  

E-Print Network (OSTI)

TEXAS SALES AND USE TAX EXEMPTION CERTIFICATION Name of purchaser, firm or agency Address (Street Tax Act; County Health Services Sales and Use Tax; The Texas Health and Safety Code; Special certificate to the Comptroller of Public Accounts. 01-339 (Back) (Rev. 11-95/3) Texas AgriLife Research

178

Do Generation Firms in Restructured Electricity Markets Have Incentives to Support Socially-Efficient Transmission Investments? *  

E-Print Network (OSTI)

that generation firms have in restructured electricity markets for supporting long-term transmission investments electricity markets, have the incentives to fund or support social-welfare-improving transmission investments.S. transmission system is under stress (Abraham, 2002). Growth of electricity demand and new generation capacity

179

Assessing the impact of knowledge management strategies announcements on the market value of firms  

Science Conference Proceedings (OSTI)

Although there is much literature on the relationship between KM strategies and organizational performance, the benefit of KM strategies is not well understood. We addressed this issue by exploring how KM strategies influence a firm's market value using ... Keywords: Event study methodology, Knowledge management strategy, Knowledge-based view, Market value, Stock market reaction

Byounggu Choi; Ana Maria Jong

2010-01-01T23:59:59.000Z

180

Operational Compliance Levers, Environmental Performance, and Firm Performance Under Cap and Trade Regulation  

Science Conference Proceedings (OSTI)

Cap and trade programs impose limits on industry emissions but offer individual firms the flexibility to choose among different operational levers toward compliance, including inputs, process changes, and the use of allowances to account for emissions. ... Keywords: cap and trade, empirical research, environmental compliance, environmental operations, public policy

James Kroes; Ravi Subramanian; Ramanath Subramanyam

2012-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Dynamic Efficiency and the Regulated Firm: Evidence from Interfirm Trade in Electricity Markets  

E-Print Network (OSTI)

This paper presents an empirical analysis of the value of a coordinated market exchange mechanism. I present a model of efficient trading mechanisms under uncertainty, and develop a measure of the value of an interfirm trade agreement in the context of sequential `buy-versus-produce' decisionmaking by firms. The theory is applied to estimate the value of a formal trading institution in the California electricity market, where an interutility power pool has been proposed to restructure the electric power industry. I develop an empirical model of the optimal production and trading decisions for a firm in such a pool, and estimate state-contingent willingness-to-trade functions for each of the four major utilities in this market. With this information, I estimate the distribution of future costs that would obtain if an efficient exchange mechanism arbitraged away observed differences between willingness-to-buy and willingness-to-sell among the sample firms. The principal finding is that with the simple, relatively state-independent bilateral contracts observed in this market, the sample firms achieve within 4% of the theoretical minimum expected costs available with a complete statecontingent exchange mechanism. This difference represents an opportunity cost of approximately $250 million per year. I conclude with regulatory and managerial explanations for the absence of a more efficient state-contingent trading mechanism, and implications for deregulating electric power markets.

Matthew W. White; Matthew W. White; Alvin Klevorick; Daniel Mcfadden; Ariel Pakes

1995-01-01T23:59:59.000Z

182

Acquisition and management of technology-based firms in a trading and investment company  

E-Print Network (OSTI)

Among several key factors affecting new technology innovation, two important ones that are sometimes disturbed by M&A are long-term p-ans and the commitment of the acquired firm's management team. M&A led by technology ...

Tanaka, Jin, M.B.A. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

183

Technology policy for the knowledge economy: Public support to young ICT service firms  

Science Conference Proceedings (OSTI)

Public intervention in high-tech sectors is often advocated to resolve market imperfections that may possibly limit the viability of young high-tech enterprises. Although some European countries have adopted national government support policies that ... Keywords: Horizontal direct public subsidies, Italy, Young ICT service firms

Massimo G. Colombo; Luca Grilli

2007-11-01T23:59:59.000Z

184

Exploring the Relationship Between Scientist Human Capital and Firm Performance: The Case of Biomedical Academic Entrepreneurs in the SBIR Program  

Science Conference Proceedings (OSTI)

There is an emerging debate in the scholarly literature regarding the extent to which academic human capital contributes to firm performance. This debate centers on the nature of an academic scientist's human capital and its institutional specificity. ... Keywords: SBIR, academic entrepreneurship, commercialization, firm performance, human capital

Andrew A. Toole; Dirk Czarnitzki

2009-01-01T23:59:59.000Z

185

Estimating stress heterogeneity from aftershock rate  

E-Print Network (OSTI)

We estimate the rate of aftershocks triggered by a heterogeneous stress change, using the rate-and-state model of Dieterich [1994]. We show than an exponential stress distribution P(\\tau)~ exp(-\\tau/\\tau_0) gives an Omori law decay of aftershocks with time ~1/t^p, with an exponent p=1-A\\sigma_n/\\tau_0, where A is a parameter of the rate-and-state friction law, and \\sigma_n the normal stress. Omori exponent p thus decreases if the stress "heterogeneity" \\tau_0 decreases. We also invert the stress distribution P(\\tau) from the seismicity rate R(t), assuming that the stress does not change with time. We apply this method to a synthetic stress map, using the (modified) scale invariant "k^2" slip model [Herrero and Bernard, 1994]. We generate synthetic aftershock catalogs from this stress change. The seismicity rate on the rupture area shows a huge increase at short times, even if the stress decreases on average. This stochastic slip model gives a Gaussian stress distribution, but nevertheless produces an aftersho...

Helmstetter, A; Helmstetter, Agnes; Shaw, Bruce E.

2005-01-01T23:59:59.000Z

186

Production Economics Modeling and Analysis of Polluting firms: The Production Frontier Approach  

E-Print Network (OSTI)

As concern grows about energy and environment issues, energy and environmental modeling and related policy analysis are critical issues for today's society. Polluting firms such as coal power plants play an important role in providing electricity to drive the U.S. economy as well as producing pollution that damages the environment and human health. This dissertation is intended to model and estimate polluting firms' production using nonparametric methods. First, frontier production function of polluting firms is characterized by weak disposability between outputs and pollutants to reflecting the opportunity cost to reduce pollutants. The StoNED method is extended to estimate a weak disposability frontier production function accounting for random noise in the data. The method is applied to the U.S. coal power plants under the Acid Rain Program to find the average technical inefficiency and shadow price of SO2 and NOx. Second, polluting firms' production processes are modeled characterizing both the output production process and the pollution abatement process. Using the law of conservation of mass applied to the pollution abatement process, this dissertation develops a new frontier pollutant function which then is used to find corresponding marginal abatement cost of pollutants. The StoNEZD method is applied to estimate a frontier pollutant function considering the vintage of capital owned by the polluting firms. The method is applied to estimate the average NOx marginal abatement cost for the U.S. coal power plants under the current Clean Air Interstate Rule NOx program. Last, the effect of a technical change on marginal abatement costs are investigated using an index decomposition technique. The StoNEZD method is extended to estimate sequential frontier pollutant functions reflecting the innovation in pollution reduction. The method is then applied to estimate a technical change effect on a marginal abatement cost of the U.S. coal power plants under the current Clean Air Interstate Rule NOx program.

Mekaroonreung, Maethee

2012-08-01T23:59:59.000Z

187

FLIP: A flexible interconnection protocol for heterogeneous internetworking  

E-Print Network (OSTI)

This paper describes the Flexible Interconnection Protocol, or FLIP, whose main goal is to allow interconnection of heterogeneous devices with varying power, processing, and communication capabilities, ranging from simple sensors to more powerful computing devices such as laptops and desktops. The vision is that FLIP will be used to interconnect such devices forming clouds in the farthest branches/leaves of the Internet, while still providing connectivity with the existing IP-based Internet infrastructure. Through its flexible, customizable headers FLIP integrates just the functions required by a given application and that can be handled by the underlying device. Simple devices like sensors will benefit from incurring close to optimal overhead saving not only bandwidth, but, more importantly, energy. More sophisticated devices in the cloud can be responsible for implementing more complex functions like reliable/ordered data delivery, communication with other device clouds and with the IP infrastructure. FLIP is designed to provide a basic substrate on which to build network- and transport-level functionality. In heterogeneous environments, FLIP allows devices with varying capabilities to coexist and interoperate under the same network infrastructure. We present the basic design of FLIP and describe its implementation under Linux. We also report on FLIP’s performance when providing IPv4 and IPv6 as well as transport-layer functionality a la TCP and UDP. We show FLIP’s energy efficiency in different sensor network scenarios. For example, we use FLIP to implement the directed diffusion communication paradigm and obtain an improvement of 50 % in energy savings over an existing directed diffusion implementation. Finally, we showcase FLIP’s flexibility by demonstrating its ability to incorporate new protocol functions

Ignacio Solis; Katia Obraczka

2004-01-01T23:59:59.000Z

188

The Influence of Reservoir Heterogeneity on Geothermal Fluid...  

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

Alliance for Sustainable Energy, LLC. THE INFLUENCE OF RESERVOIR HETEROGENEITY ON GEOTHERMAL FLUID AND METHANE RECOVERY FROM A GEOPRESSURED GEOTHERMAL RESERVOIR Ariel Esposito...

189

Advances in Synthesis and Densification of Heterogeneous Materials  

Science Conference Proceedings (OSTI)

Advances in Current Activated Tip-Based Sintering (CATS) · Advances in Synthesis and Densification of Heterogeneous Materials · Application of Metal Injection ...

190

Structural and Chemical Heterogeneities of Ultrafine Eutectic Alloys  

Science Conference Proceedings (OSTI)

Based on these investigaions, it is possible to systematically categorize the influence of structural and chemical heterogeneities on deformation behavior of the ...

191

On the Numerical Simulation of Waterflooding of Heterogeneous Petroleum Reservoirs  

E-Print Network (OSTI)

We present a new, naturally parallelizable, accurate numerical method for the solution of transport-dominated diffusion processes in heterogeneous porous media.

Jim Douglas, Jr.; Frederico Furtado; Felipe Pereira

1997-01-01T23:59:59.000Z

192

Automated resolution of semantic heterogeneity in multidatabases  

Science Conference Proceedings (OSTI)

A multidatabase system provides intergrated access to heterogeneous, autonomous local databases in a distributed system. An important problem in current multidatabase systems is identification of semantically similar data in different local databases. The Summary Schemas Model (SSM) is proposed as an extension to multidatabase systems to aid in semantic identification. The SSM uses a global data structure to abstract the information available in a multidatabase system. This abstracted form allows users to use their own terms. The system uses the global data structure to match the user`s terms to the semantically closest available system terms. A simulation of the SSM is presented to compare imprecise-query processing with corresponding query-processing costs in a standard multidatabase system. The costs and benefits of the SSM are discussed, and future research directions are presented. 57 refs., 15 figs.

Bright, M.W. [IBM Federal Systems Company, Gaithersburg, MD (United States); Hurson, A.R.; Pakzad, S. [Pennsylvania State Univ., University Park, PA (United States)

1994-06-01T23:59:59.000Z

193

Microwave-Assisted Heterogeneous Catalytic Transesterification of Soybean Oil  

Science Conference Proceedings (OSTI)

Biodiesel, as a renewable bioenergy, recently has been researched in regard to biodiesel products. In this study, soybean oil was converted to biodiesel with methanol using several heterogeneous catalysts, furthermore, the process by means of microwave ... Keywords: Biodiesel, Transesterification, Microwave, Heterogeneous

Ming-Chien Hsiao; Pei-Hung Liao; Hsiu-Ling Hsu

2012-06-01T23:59:59.000Z

194

Three-phase immiscible displacement in heterogeneous petroleum reservoirs  

Science Conference Proceedings (OSTI)

We describe a fractional-step numerical procedure for the simulation of immiscible three-phase flow in heterogeneous porous media that takes into account capillary pressure and apply it to indicate the existence of a so-called "transitional" wave in ... Keywords: central difference scheme, heterogeneous reservoirs, mixed finite elements, operator splitting, three-phase flow

E. Abreu; J. Douglas, Jr.; F. Furtado; D. Marchesin; F. Pereira

2006-11-01T23:59:59.000Z

195

Power-efficient time-sensitive mapping in heterogeneous systems  

Science Conference Proceedings (OSTI)

Heterogeneous systems that contain multiple types of resources, such as CPUs and GPUs, are becoming increasingly popular thanks to the potential of achieving high performance and energy efficiency. In such systems, the problem of data mapping and communication ... Keywords: heterogeneous cpu/gpu multiprocessors, multi-core architectures, power-efficient scheduling

Cong Liu; Jian Li; Wei Huang; Juan Rubio; Evan Speight; Xiaozhu Lin

2012-09-01T23:59:59.000Z

196

Tarazu: optimizing MapReduce on heterogeneous clusters  

Science Conference Proceedings (OSTI)

Data center-scale clusters are evolving towards heterogeneous hardware for power, cost, differentiated price-performance, and other reasons. MapReduce is a well-known programming model to process large amount of data on data center-scale clusters. Most ... Keywords: MapReduce, cluster scheduling, heterogeneous clusters, load imbalance, shuffle

Faraz Ahmad; Srimat T. Chakradhar; Anand Raghunathan; T. N. Vijaykumar

2012-04-01T23:59:59.000Z

197

Transport over heterogeneous networks using the RINA architecture  

Science Conference Proceedings (OSTI)

The evolution of various wireless technologies has greatly increased the interest in heterogeneous networks, in which the mobile users can enjoy services while roaming between different networks. The current Internet architecture does not seem to cope ... Keywords: data transport, hand-offs, heterogeneous networks, mobility, recursive inter-network architecture (RINA)

Eleni Trouva; Eduard Grasa; John Day; Ibrahim Matta; Lubomir T. Chitkushev; Steve Bunch; Miguel Ponce de Leon; Patrick Phelan; Xavier Hesselbach-Serra

2011-06-01T23:59:59.000Z

198

Analysis of gravitational wave signals on heterogeneous architectures  

Science Conference Proceedings (OSTI)

Heterogeneous architectures and programming techniques will be very important in the development of exascale HPC applications. Adapting heterogeneous programming techniques to scientific programming is not always straightforward. Here we present an in-depth ... Keywords: gravitational waves, hybrid computing, parallel computations

Maciej Cytowski

2010-06-01T23:59:59.000Z

199

Processor virtualization and split compilation for heterogeneous multicore embedded systems  

Science Conference Proceedings (OSTI)

Embedded multiprocessors have always been heterogeneous, driven by the power-efficiency and compute-density of hardware specialization. We aim to achieve portability and sustained performance of complete applications, leveraging diverse programmable ... Keywords: annotations, back-end optimization, bytecode language, heterogeneous multicore, portable performance, specialization, split compilation, vectorization, virtualization

Albert Cohen; Erven Rohou

2010-06-01T23:59:59.000Z

200

Handover strategy of smart mobile terminals among heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Due to the variety of wireless networks, the handover among heterogeneous wireless networks has become a research hotspot in recent years. More attention have been paid to the radio access network and the core network than the terminal side. In the future ... Keywords: heterogeneous wireless network, network handover, network handover design, smart mobile terminal

Wei Lin; Weiqiang Wu; Qinyu Zhang

2008-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

An Ontology-Based Method for Integrating Heterogeneous Itembanks  

Science Conference Proceedings (OSTI)

In this paper, we present a simple but efficient algorithm for integrating a collection of heterogeneous itembanks, called Heterogeneous Itembanks Integrator (HIBI). This algorithm is motivated by the desire to integrate itembanks provided by publishers ... Keywords: Itembanks, e-Learning System, and ontology

Chun-Wei Tsai; Shih-Pang Tseng; Yu-Sheng Yang; Ming-Chao Chiang; Chu-Sing Yang

2009-11-01T23:59:59.000Z

202

Engineering complex adaptations in highly heterogeneous distributed systems  

Science Conference Proceedings (OSTI)

Distributed systems now encounter extreme heterogeneity in the form of diverse devices, network types etc., and also need to dynamically adapt to changing environmental conditions. Self-adaptive middleware is ideally situated to address these challenges. ... Keywords: adaptation, heterogeneity, middleware, reflection

Paul Grace; Gordon S. Blair; Carlos Flores Cortes; Nelly Bencomo

2008-09-01T23:59:59.000Z

203

A dynamic self-scheduling scheme for heterogeneous multiprocessor architectures  

Science Conference Proceedings (OSTI)

Today's heterogeneous architectures bring together multiple general-purpose CPUs and multiple domain-specific GPUs and FPGAs to provide dramatic speedup for many applications. However, the challenge lies in utilizing these heterogeneous processors to ... Keywords: Dynamic self-scheduling, FPGAs, GP-GPUs, workload balancing

Mehmet E. Belviranli; Laxmi N. Bhuyan; Rajiv Gupta

2013-01-01T23:59:59.000Z

204

New Jersey firm creates jobs and vital components for world-leading  

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

Jersey firm creates jobs and vital components for world-leading Jersey firm creates jobs and vital components for world-leading experiment By John Greenwald July 10, 2012 Tweet Widget Facebook Like Google Plus One This superconducting wire will become thin as a needle when Oxford Superconducting Technology finishes manufacturing it. (Photo by Elle Starkman, PPPL Office Of Communications) This superconducting wire will become thin as a needle when Oxford Superconducting Technology finishes manufacturing it. Gallery: Oxford Superconducting begins with a foot-long copper and niobium billet that weighs several hundred pounds. (Photo by Elle Starkman, PPPL Office Of Communications) Oxford Superconducting begins with a foot-long copper and niobium billet that weighs several hundred pounds. The billets are drawn down until more than a dozen can be stacked inside a hollow copper tube like those that General Manager Jeffrey Parrell shows here. He holds a billet-filled tube that has been drawn down some more.

205

NREL: News - NREL Report Firms Up Land-Use Requirements of Solar  

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

NREL Report Firms Up Land-Use Requirements of Solar NREL Report Firms Up Land-Use Requirements of Solar Study shows solar for 1,000 homes would require 32 acres July 30, 2013 The Energy Department's National Renewable Energy Laboratory (NREL) has published a report on the land use requirements of solar power plants based on actual land-use practices from existing solar facilities. "Having real data from a majority of the solar plants in the United States will help people make proper comparisons and informed decisions," lead author Sean Ong said. The report, "Land-use Requirements for Solar Power Plants in the United States," was written with NREL colleagues Clinton Campbell, Robert Margolis, Paul Denholm and Garvin Heath. Ong gathered data from 72% of the solar power plants installed or under

206

Estimating Firm-Level Demand at a Price Comparison Site: Accounting for Shoppers and the Number of Competitors  

E-Print Network (OSTI)

Ellison, “Search, Obfuscation, and Price Elasticities on theMorgan, and Patrick Scholten, “Price Dispersion in the SmallEvidence from an Internet Price Comparison Site,”Journal of

Baye, Michael; GATTI, RUPERT J; Kattuman, Paul; Morgan, John

2004-01-01T23:59:59.000Z

207

The pros and cons of corruption of firm performance : a micro-level study of businesses in Indonesia  

E-Print Network (OSTI)

Over the past 10 years, different international organization and NGO's have given birth to a whole host of different anti corruption programs in response to the recent "endemic" of corruption which is seen to plague ...

Murdaya, Karuna

2005-01-01T23:59:59.000Z

208

Analysing firm performance in Chinese IT industry: DEA Malmquist productivity measure  

Science Conference Proceedings (OSTI)

Chinese IT industry has become more important and maturity after development for tens of years and come up quickly in global IT market. They may have huge influence on Chinese IT market or even the world. This paper is concerned with the study on exploring ... Keywords: China, DEA, IT industry, Malmquist productivity index, data envelopment analysis, efficiency, efficiency convergence, firm performance, information technology, performance measurement, technical diffusion

Xiaohong Chen; Xiaoding Wang; Desheng Dash Wu; Zejing Zhang

2011-12-01T23:59:59.000Z

209

The structural preconditions for maximizing FDI spillovers in Colombia : a sectoral impact analysis of Foreign Direct Investment (FDI) on Industry output, labor payments, firm productivity, and the productive structure (1995-2009)  

E-Print Network (OSTI)

Do multinational corporations (MNCs) crowd out domestic firms in developing countries, or is foreign direct investment (FDI) complementary to domestic firm profitability, productivity, and employment? Empirical literature ...

Hyman, Benjamin G. (Benjamin Gabriel)

2011-01-01T23:59:59.000Z

210

Truth-telling by Third-party Auditors and the Response of Polluting Firms: Experimental Evidence from India  

E-Print Network (OSTI)

In many regulated markets, private, third-party auditors are chosen and paid by the firms that they audit, potentially creating a conflict of interest. This paper reports on a two-year field experiment in the Indian state ...

Duflo, Esther

2013-07-17T23:59:59.000Z

211

Why did they comply while others did not? : environmental compliance of small firms and implications for regulation  

E-Print Network (OSTI)

This doctoral dissertation aims to offer new insights into the environmental compliance behavior of small firms (SFs). Specifically, the dissertation examines the impacts of two categories of factors. The first category ...

Lee, Eungkyoon

2005-01-01T23:59:59.000Z

212

Mr. L. Roger Hutson Roger Hutson is the President/CEO of HRM Resources LLC., a private firm specializing in  

E-Print Network (OSTI)

Mr. L. Roger Hutson Roger Hutson is the President/CEO of HRM Resources LLC., a private firm of the Board and as Chairman of the Finance and Audit Committee. Contact Information: Mr. L. Roger Hutson HRM

213

Qualitative constraint calculi: Heterogeneous verification of composition tables  

E-Print Network (OSTI)

In the domain of qualitative constraint reasoning, a subfield of AI which has evolved in the past 25 years, a large number of calculi for efficient reasoning about spatial and temporal entities has been developed. Reasoning techniques developed for these constraint calculi typically rely on so-called composition tables of the calculus at hand, which allow for replacing semantic reasoning by symbolic operations. Often these composition tables are developed in a quite informal, pictorial manner and hence composition tables are prone to errors. In view of possible safety critical applications of qualitative calculi, however, it is desirable to formally verify these composition tables. In general, the verification of composition tables is a tedious task, in particular in cases where the semantics of the calculus depends on higher-order constructs such as sets. In this paper we address this problem by presenting a heterogeneous proof method that allows for combining a higherorder proof assistance system (such as Isabelle) with an automatic (first order) reasoner (such as SPASS or VAMPIRE). The benefit of this method is that the number of proof obligations that is to be proven interactively with a semi-automatic reasoner can be minimized to an acceptable level.

Stefan Wölfl

2007-01-01T23:59:59.000Z

214

Pin diameter optimization in 1200 MWe heterogeneous vs. homogeneous LMFBRs  

SciTech Connect

LMFBRs with internal blankets (heterogeneous reactors) are known for reducing the sodium void reactivity and increasing the breeding ratio. As for homogeneous reactors, the optimization of the fuel pin diameter for heterogeneous reactors is of great interest. The optimum pin diameter is obtained by changing the fuel pin diameter until the homogenized fuel volume fraction is the same as the optimum fuel volume fraction of the homogeneous core. The optimization of the fuel pin diameter with respect to doubling time for a loosely coupled 1200 MWe oxide heterogeneous reactor is described. The results are compared with those of a homogeneous reactor.

Orechwa, Y.; Turski, R.B.; King, M.J.

1977-01-01T23:59:59.000Z

215

Heterogenization of Homogeneous Catalysts: the Effect of the Support  

DOE Green Energy (OSTI)

We have studied the influence of placing a soluble, homogeneous catalyst onto a solid support. We determined that such a 'heterogenized' homogeneous catalyst can have improved activity and selectivity for the asymmetric hydrogenation of enamides to amino acid derivatives. The route of heterogenization of RhDuPhos(COD){sup +} cations occurs via electrostatic interactions with anions that are capable of strong hydrogen bonding to silica surfaces. This is a novel approach to supported catalysis. Supported RhDuPhos(COD){sup +} is a recyclable, non-leaching catalyst in non-polar media. This is one of the few heterogenized catalysts that exhibits improved catalytic performance as compared to its homogeneous analog.

Earl, W.L.; Ott, K.C.; Hall, K.A.; de Rege, F.M.; Morita, D.K.; Tumas, W.; Brown, G.H.; Broene, R.D.

1999-06-29T23:59:59.000Z

216

Holey Random Walks: Optics of Heterogeneous Turbid Composites  

E-Print Network (OSTI)

We present a probabilistic theory of random walks in turbid media with non-scattering regions. It is shown that important characteristics such as diffusion constants, average step lengths, crossing statistics and void spacings can be analytically predicted. The theory is validated using Monte Carlo simulations of light transport in heterogeneous systems in the form of random sphere packings, and good agreement is found. The role of step correlations is discussed, and differences between unbounded and bounded systems are investigated. Our results are relevant to the optics of heterogeneous systems in general, and represent an important step forward in the understanding of media with strong (fractal) heterogeneity in particular.

Svensson, Tomas; Grisi, Marco; Savo, Romolo; Burresi, Matteo; Wiersma, Diederik S

2012-01-01T23:59:59.000Z

217

Data management in heterogeneous environments and its implications to CEDR  

Science Conference Proceedings (OSTI)

We investigate in this report the issue of data management across multiple pre-existing databases characterized by various degrees of heterogeneity. Different approaches to the problem of data management in heterogeneous environments are reviewed and their advantages and disadvantages are discussed. We examine in some detail the problem of schema integration involved in these approaches. We illustrate different aspects of data management in heterogeneous environments with examples from the Comprehensive Epidemiological Data Resource (CEDR) project, and conclude the report with recommendations for CEDR. These recommendations are summarized in this paper.

Markowitz, V.M.

1990-10-27T23:59:59.000Z

218

Towards a multifrontal QR factorization for heterogeneous architectures over runtime systems  

E-Print Network (OSTI)

, computer architectures for high performance computing have considerably evolved toward heterogeneous. An example of popular heterogeneous architectures widely adopted in the high performance computing domain

Uçar, Bora

219

Heterogeneous Responses to Water Conservation Programs: The Case of Residential Users in Los Angeles  

E-Print Network (OSTI)

on welfare of water conservation programs (compensatingHeterogeneous Responses to Water Conservation Programs: TheHeterogeneous responses to water conservations programs: the

Hanemann, W. Michael; Nauges, Celine

2005-01-01T23:59:59.000Z

220

Addressing the Challenges of Aggregational and Temporal Ontological Heterogeneity  

E-Print Network (OSTI)

In this paper, we first identify semantic heterogeneities that, when not resolved, often cause serious data quality problems. We discuss the especially challenging problems of temporal and aggregational ontological ...

Zhu, Hongwei

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Discrete Feature Approach for Heterogeneous Reservoir Production Enhancement  

Science Conference Proceedings (OSTI)

The report presents summaries of technology development for discrete feature modeling in support of the improved oil recovery (IOR) for heterogeneous reservoirs. In addition, the report describes the demonstration of these technologies at project study sites.

Dershowitz, William S.; Curran, Brendan; Einstein, Herbert; LaPointe, Paul; Shuttle, Dawn; Klise, Kate

2002-07-26T23:59:59.000Z

222

EA-1790: Construction and Operation of a Heterogeneous Feed Biorefinery  

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

EA-1790: Construction and Operation of a Heterogeneous Feed EA-1790: Construction and Operation of a Heterogeneous Feed Biorefinery Enerkem Corporation Pontotoc, MS EA-1790: Construction and Operation of a Heterogeneous Feed Biorefinery Enerkem Corporation Pontotoc, MS SUMMARY The U.S. Department of Energy (DOE or the Department) is proposing to provide cost share funding to Enerkem, Inc (Enerkem) for the final design, construction, and operation of a proposed Heterogeneous Feed Biorefinery Project to be located in Pontotoc, Mississippi (hereafter referred to as the biorefinery or the proposed project). The biorefinery would use the dried and post-sorted biomass fraction of municipal solid waste (MSW) and wood biomass as feedstock. Enerkem's biorefinery would produce approximately 10 million gallons (38 million liters) of ethanol per year

223

Dynamic sensor tasking in heterogeneous, mobile sensor networks  

E-Print Network (OSTI)

Modern sensor environments often attempt to combine several sensors into a single sensor network. The nodes of this network are generally heterogeneous and may vary with respect to sensor complexity, sensor operational ...

Jones, Peter B. (Peter B.), S.M., Massachusetts Institute of Technology

2005-01-01T23:59:59.000Z

224

Heterogeneous breast phantom development for microwave imaging using regression models  

Science Conference Proceedings (OSTI)

As new algorithms for microwave imaging emerge, it is important to have standard accurate benchmarking tests. Currently, most researchers use homogeneous phantoms for testing new algorithms. These simple structures lack the heterogeneity of the dielectric ...

Camerin Hahn; Sima Noghanian

2012-01-01T23:59:59.000Z

225

Observations of Fluxes and Inland Breezes over a Heterogeneous Surface  

Science Conference Proceedings (OSTI)

Repeated aircraft runs at about 33 m over heterogeneous terrain are analyzed to study the spatial variability of the mesoscale flow and turbulent fluxes. An irrigated area, about 12 km across, generates a relatively cool moist inland breeze. As ...

L. Mahrt; Jielun Sun; Dean Vickers; J. I. Macpherson; J. R. Pederson; R. L. Desjardins

1994-09-01T23:59:59.000Z

226

Mobile identity management system in heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Heterogeneous wireless networks increasingly encroach on our lives. Various technologies and mobile applications more often than usual are now used by mobile users. Intensive development of mobile networks not only sets new standards for radio, but increasingly ...

?Ukasz Kucharzewski; Zbigniew Kotulski

2011-01-01T23:59:59.000Z

227

Designing a unified programming model for heterogeneous machines  

Science Conference Proceedings (OSTI)

While high-efficiency machines are increasingly embracing heterogeneous architectures and massive multithreading, contemporary mainstream programming languages reflect a mental model in which processing elements are homogeneous, concurrency is limited, ...

Michael Garland; Manjunath Kudlur; Yili Zheng

2012-11-01T23:59:59.000Z

228

Heterogeneity and dynamicity of clouds at scale: Google trace analysis  

Science Conference Proceedings (OSTI)

To better understand the challenges in developing effective cloud-based resource schedulers, we analyze the first publicly available trace data from a sizable multi-purpose cluster. The most notable workload characteristic is heterogeneity: in resource ...

Charles Reiss; Alexey Tumanov; Gregory R. Ganger; Randy H. Katz; Michael A. Kozuch

2012-10-01T23:59:59.000Z

229

Approaches for Averaging Surface Parameters and Fluxes over Heterogeneous Terrain  

Science Conference Proceedings (OSTI)

Successful prediction of possible climate change depends on realistic parameterization of land surface processes in climate models. Such parameterizations must take appropriate account of the heterogeneities that are found in most earth surfaces. ...

A. Chehbouni; E. G. Njoku; J-P. Lhomme; Y. H. Kerr

1995-05-01T23:59:59.000Z

230

Statistical abstraction and model-checking of large heterogeneous systems  

Science Conference Proceedings (OSTI)

We propose a new simulation-based technique for verifying applications running within a large heterogeneous system. Our technique starts by performing simulations of the system in order to learn the context in which the application is used. Then, it ...

Ananda Basu; Saddek Bensalem; Marius Bozga; Benoît Caillaud; Benoît Delahaye; Axel Legay

2010-06-01T23:59:59.000Z

231

Progress in Developing and Extending RM³ Heterogeneous Integration Technologies  

E-Print Network (OSTI)

This paper describes recent progress in a continuing program to develop and apply RM³ (recess mounting with monolithic metallization) technologies for heterogeneous integration. Particular emphasis is placed on the APB ...

Fonstad, Clifton G. Jr.

232

Laboratory Measurements of Heterogeneous Reactions on Sulfuric Acid Surfaces  

Science Conference Proceedings (OSTI)

Increasing evidence from field, modeling, and laboratory studies suggests that heterogeneous reactions on stratospheric sulfate aerosol particles may contribute to global ozone depiction. Using a Knudsen cell reactor technique, the authors have ...

Leah R. Williams; Jeffrey A. Manion; David M. Golden; Margaret A. Tolbert

1994-07-01T23:59:59.000Z

233

Grounding Analysis in Heterogeneous Soil Models: Application to Underground Substations  

E-Print Network (OSTI)

Grounding Analysis in Heterogeneous Soil Models: Application to Underground Substations Ignasi in forthcoming publications. Keywords-grounding analysis; earthing analysis, underground substations; I to a river (at substations next to hydroelectric dams), or the grounding system of a buried electrical

Colominas, Ignasi

234

Dynamic Mapping in Energy Constrained Heterogeneous Computing Systems  

Science Conference Proceedings (OSTI)

An ad hoc grid is a wireless heterogeneous computing environment without a fixed infrastructure. The wireless devices have different capabilities, have limited battery capacity, support dynamic voltage scaling, and are expected to be used for eight hours ...

Jong-Kook Kim; H. J. Siegel; Anthony A. Maciejewski; Rudolf Eigenmann

2005-04-01T23:59:59.000Z

235

Probabilistic search optimization and mission assignment for heterogeneous autonomous agents  

Science Conference Proceedings (OSTI)

This paper presents an algorithmic framework for conducting search and identification missions using multiple heterogeneous agents. Dynamic objects of type "neutral" or "target" move through a discretized environment. Probabilistic representation of ...

Timothy H. Chung; Moshe Kress; Johannes O. Royset

2009-05-01T23:59:59.000Z

236

Energy coservation status and needs: medium-sized commercial/industrial firms  

SciTech Connect

The potential for conserving energy by Seattle City Light's commercial/industrial customers is investigated. The results of the study will help SCL and others to provide energy- and money-saving help to their medium-sized business customers. Fifty in-person interviews of firms within the SCL area and 102 mailed questionnaires from customers outside the area in Washington and Oregon were analyzed. Researchers found that many steps requiring little cost have been implemented, but instituting further hard conservation measures such as new machinery, retrofitting, or changes in machine operations are lacking. (MCW)

1979-10-01T23:59:59.000Z

237

Heterogeneous wireless sensor network deployment and topology control based on irregular sensor model  

Science Conference Proceedings (OSTI)

Heterogeneous wireless sensor network (heterogeneous WSN) consists of sensor nodes with different ability, such as different computing power and sensing range. Compared with homogeneous WSN, deployment and topology control are more complex in heterogeneous ... Keywords: heterogeneous sensor deployment, irregular sensor model, sensor coverage, topology control, wireless sensor network

Chun-Hsien Wu; Yeh-Ching Chung

2007-05-01T23:59:59.000Z

238

High-level Programming of Dynamically Reconfigurable NoC-based Heterogeneous Multicore SoCs  

E-Print Network (OSTI)

Vanderbauwhede,W. Dynamic Reconfigurable Network-on-Chip Design: Innovations for Computational Processing and Communication Idea Group Publishing

Vanderbauwhede, W.

239

Heterogeneity in Price Rigidity: Evidence from a Case Study Using Micro-Level Data  

E-Print Network (OSTI)

The authors thank two anonymous referees, and John Leahy and Alan Stockman, the discussants at the April 1997 NBER

Daniel Levy; Shantanu Dutta; Mark Bergen; Jel Codes E

2002-01-01T23:59:59.000Z

240

Distributions of Surface-Layer Buoyancy Versus Lifting Condensation Level over a Heterogeneous Land Surface  

Science Conference Proceedings (OSTI)

Onset and coverage of small cumulus clouds depend on the relative abundance of surface-layer air parcels possessing favourable buoyancy and moisture—two variables that are coupled through the surface energy budget. This abundance is described ...

Kelly Schrieber; Roland Stull; Qing Zhang

1996-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Review Article Activities of Heterogeneous Acid-Base Catalysts for Fragrances Synthesis: A Review  

E-Print Network (OSTI)

This paper reviews various types of heterogeneous acid-base catalysts for fragrances preparation. Catalytic activities of the various types of heterogeneous acid and base catalysts in fragrances preparation, i.e. nonzeolitic, zeolitic, and mesoporous molecular sieves, have been reported. Generally, heterogeneous acid catalysts are more commonly used in fragrance synthesis as compared to heterogeneous base catalysts. Heteropoly acids and hydrotalcites type catalysts are widely used as heterogeneous acid and base catalysts, respectively. © 2013 BCREC UNDIP. All rights reserved.

H. Hartati; Mardi Santoso; Sugeng Triwahyono; Didik Prasetyoko

2013-01-01T23:59:59.000Z

242

PARLO: PArallel Run-Time Layout Optimization for Scientific Data Explorations with Heterogeneous Access Pattern  

SciTech Connect

Download Citation Email Print Request Permissions Save to Project The size and scope of cutting-edge scientific simulations are growing much faster than the I/O and storage capabilities of their run-time environments. The growing gap is exacerbated by exploratory, data-intensive analytics, such as querying simulation data with multivariate, spatio-temporal constraints, which induces heterogeneous access patterns that stress the performance of the underlying storage system. Previous work addresses data layout and indexing techniques to improve query performance for a single access pattern, which is not sufficient for complex analytics jobs. We present PARLO a parallel run-time layout optimization framework, to achieve multi-level data layout optimization for scientific applications at run-time before data is written to storage. The layout schemes optimize for heterogeneous access patterns with user-specified priorities. PARLO is integrated with ADIOS, a high-performance parallel I/O middleware for large-scale HPC applications, to achieve user-transparent, light-weight layout optimization for scientific datasets. It offers simple XML-based configuration for users to achieve flexible layout optimization without the need to modify or recompile application codes. Experiments show that PARLO improves performance by 2 to 26 times for queries with heterogeneous access patterns compared to state-of-the-art scientific database management systems. Compared to traditional post-processing approaches, its underlying run-time layout optimization achieves a 56% savings in processing time and a reduction in storage overhead of up to 50%. PARLO also exhibits a low run-time resource requirement, while also limiting the performance impact on running applications to a reasonable level.

Gong, Zhenhuan [North Carolina State University, Raleigh; Boyuka, David [North Carolina State University, Raleigh; Zou, X [North Carolina State University, Raleigh; Liu, Gary [ORNL; Podhorszki, Norbert [ORNL; Klasky, Scott A [ORNL; Ma, Xiaosong [North Carolina State University, Raleigh; Samatova, Nagiza F [ORNL

2013-01-01T23:59:59.000Z

243

SF 6432-FP Standard Terms and Conditions for Firm Fixed-price Contracts  

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

FP (04-95) FP (04-95) Sections II & III SECTION II STANDARD TERMS AND CONDITIONS FOR FIRM FIXED PRICE CONTRACTS INDEX OF CLAUSES THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE SIGNATURE PAGE OR SECTION I. No. Title Page "A" Clauses apply to Requests for Quotation and Contracts at any value A10 Definitions 2 A11 Unclassified Contract 2 A12 Assignment 2 *A13 Releases Void 2 *A14 Notice of Labor Disputes 2 A17 Delegated Representatives 2 *A18 Defense Priority and Allocation System 2 A19 Terms and Conditions 3 *A20 Permits 3 *A23 Applicable Law 3 A25 Commerce in Explosives, Firearms and 3 Ammunition - Exemption *A27 Order of Precedence

244

ESS 2012 Peer Review - Wind Firming EnergyFarm - Tom Stepien, Primus Power  

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

Wind Firming EnergyFarm DOE Peer Review September 26, 2012 2 Primus Power is on track to deliver EnergyPods TM to California's Modesto Irrigation District starting 2014 EnergyPod TM 250 kW ï‚· 1 MWh PowerBox Supports 8 EnergyPods TM 3 How will storage integrate into Modesto's system? Modesto's daily load ? Storage Hydro Coal & Gas Wind Solar 4 Modesto's 25 MW McHenry solar farm 5 Modesto will use EnergyPods to integrate renewable wind and solar energy 25 MW McHenry Solar Farm 6 Modesto will use EnergyPods to integrate renewable wind and solar energy 25 MW McHenry Solar Farm 8.7 MW up in 15 min 15 MW down in 15 min 4-Aug-12 7 Modesto will use EnergyPods to integrate renewable wind and

245

On construction of a library of formally verified low-level arithmetic functions  

Science Conference Proceedings (OSTI)

Most information security infrastructures rely on cryptography, which is usually implemented with low-level arithmetic functions. The formal verification of these functions therefore becomes a prerequisite to firmly assess any security property. We propose ... Keywords: hoare logic, multi-precision, proof-assistant, simulation

Reynald Affeldt

2012-03-01T23:59:59.000Z

246

Information technology and business-level strategy: toward an integrated theoretical perspective  

Science Conference Proceedings (OSTI)

Information technology matters to business success because it directly affects the mechanisms through which they create and capture value to earn a profit: IT is thus integral to a firm's business-level strategy. Much of the extant research on the IT/strategy ... Keywords: IT capability, IT strategy, competitive advantage, information systems, information technology, management theory, performance, technology management

Paul L. Drnevich, David C. Croson

2013-06-01T23:59:59.000Z

247

Do Generation Firms in Restructured Electricity Markets Have Incentives to Support Social-Welfare-Improving Transmission Investments? *  

E-Print Network (OSTI)

Transmission Grid Study of the U.S. Department of Energy (Abraham, 2002) declares: "Growth in electricity of incentives for investment in the U.S. electricity transmission system are sparse. Moreover, noneDo Generation Firms in Restructured Electricity Markets Have Incentives to Support Social

Oren, Shmuel S.

248

Do Generation Firms in Restructured Electricity Markets Have Incentives to Support Social-Welfare-Improving Transmission Investments? *  

E-Print Network (OSTI)

that generation firms have in restructured electricity markets for supporting long-term transmission investments electricity markets, have the incentives to fund or support incremental social-welfare-improving transmission.S. transmission system is under stress (Abraham, 2002). Growth of electricity demand and new generation capacity

249

Energy Intense Equipment Purchasing Behaviour: A Review of the Literature i How do consumers and firms purchase equipment  

E-Print Network (OSTI)

by Natural Resources Canada with maintaining an ongoing database of information in the field of equipment, this report is an attempt to synthesize the information in the database; it outlines the most important issues. ........................................................16 7. DOCUMENT AND DATABASE REFERENCESERROR! BOOKMARK NOT DEFINED. #12;How do consumers and firms

250

Joint selection of customs broker agencies and international road transportation firms by a fuzzy analytic network process approach  

Science Conference Proceedings (OSTI)

This paper considers a special case for logistics activities in Turkey: a joint selection of customs broker agency and international road transportation firm. For this purpose a decision-making team has been constituted, including members of logistics ... Keywords: Analytic network process, Customs broker, Fuzzy sets, International road transportation, Logistic activities

Arzum Özgen; Mehmet Tanyas

2011-07-01T23:59:59.000Z

251

The use of a hybrid fuzzy-Delphi-AHP approach to develop global business intelligence for information service firms  

Science Conference Proceedings (OSTI)

Due to globalization and saturated domestic markets, information service firms, upon growing to a certain size, gradually focus their business efforts on reaching global markets. In order to reduce business risk in developing international markets, using ... Keywords: Alliance, Business intelligence (BI), Fuzzy analytic hierarchy process (FAHP), Fuzzy modified Delphi method, Information services industry, Modified Delphi approach

Ming-Kuen Chen; Shih-Ching Wang

2010-11-01T23:59:59.000Z

252

Developing an organizational attributes-based continuous-learning KM model for knowledge-intensive small firms  

Science Conference Proceedings (OSTI)

In this paper we draw on the knowledge market analogy and integrate the considerations of organizational culture and attributes, knowledge management (KM) guiding principles and continuous learning-based systems development into the design of a model ... Keywords: KM guiding principles, continuous learning, knowledge intensive firms, knowledge management, knowledge market, organizational culture

Pi-Sheng Deng

2006-12-01T23:59:59.000Z

253

Accounting of heterogeneity in the estimation of radiation risks  

Science Conference Proceedings (OSTI)

The problem is considered of taking account of heterogeneity in the individual radiosensitivity in evaluating the radiation risk of the origin of a disease in a group of persons subjected to the radiation action. Mathematical models are described for ... Keywords: 87.15.Aa

A. I. Mikhalskii; V. K. Ivanov; S. Yu. Chekin; M. A. Maksyutov; V. V. Kashcheev

2008-06-01T23:59:59.000Z

254

Approaches to Relating and Integrating Semantic Data from Heterogeneous Sources  

Science Conference Proceedings (OSTI)

Integrating and relating heterogeneous data using inference is one of the cornerstones of semantic technologies and there are a variety of ways in which this may be achieved. Cross source relationships can be automatically translated or inferred using ... Keywords: inference, semantic integration, OWL/RDF, rules, query

John Keeney; Aidan Boran; Ivan Bedini; Christopher J. Matheus; Peter F. Patel-Schneider

2011-08-01T23:59:59.000Z

255

Object Exchange Across Heterogeneous Information Sources Yannis Papakonstantinou  

E-Print Network (OSTI)

heterogeneous bibliographic information sources. We also describe two general-purpose libraries we have consist of free-form text; even if the text does have some structure, the elds" e.g., author, title, etc information format CLIENT Query translated into Query Language of Info Source Info Source Result from Query

Papakonstantinou, Yannis

256

Object Exchange Across Heterogeneous Information Sources \\Lambda Yannis Papakonstantinou  

E-Print Network (OSTI)

and language have been used to integrate heterogeneous bibliographic information sources. We also describe two schema to describe the data. For example, a source may consist of free­form text; even if the text does information format CLIENT Query translated into Query Language of Info Source Info Source Result from Query

Papakonstantinou, Yannis

257

Unified Access to Heterogeneous Data in Cultural Heritage  

E-Print Network (OSTI)

. This approach raises the following two main questions: 1. Is a full-text IR solution suitable for unified access the combined data of a large museum. As a first step, we modified a typical full-text IR system and loaded up heterogeneous collections of the Gemeentemuseum. But how can we compare the retrieval effectiveness of a full-text

Kamps, Jaap

258

Electrostatic Interaction of Heterogeneously Charged Surfaces with Semipermeable Membranes  

E-Print Network (OSTI)

In this paper we study the electrostatic interaction of a heterogeneously charged wall with a neutral semipermeable membrane. The wall consists of periodic stripes, where the charge density varies in one direction. The membrane is in a contact with a bulk reservoir of an electrolyte solution and separated from the wall by a thin film of salt-free liquid. One type of ions (small counterions) permeates into the gap and gives rise to a distance-dependent membrane potential, which translates into a repulsive electrostatic disjoining pressure due to an overlap of counterion clouds in the gap. To quantify it we use two complementary approaches. First, we propose a mean-field theory based on a linearized Poisson-Boltzmann equation and Fourier analysis. These calculations allow us to estimate the effect of a heterogeneous charge pattern at the wall on the induced heterogeneous membrane potential, and the value of the disjoining pressure as a function of the gap. Second, we perform Langevin dynamics simulations of the same system with explicit ions. The results of the two approaches are in good agreement with each other at low surface charge and small gap, but differ due to nonlinearity at the higher charge. These results demonstrate that a heterogeneity of the wall charge can lead to a huge reduction in the electrostatic repulsion, which could dramatically facilitate a self-assembly in complex synthetic and biological systems.

Salim R. Maduar; Vladimir Lobaskin; Olga I. Vinogradova

2013-07-17T23:59:59.000Z

259

A Heuristic Algorithm for Mapping Communicating Tasks on Heterogeneous Resources  

E-Print Network (OSTI)

data-processing tasks onto heterogeneous resources (i.e., processors and links of various capacities) is presented. The algorithm tries to achieve a good throughput of the whole data-processing pipeline, taking of geographically distributed compute- and data-resources connected with diverse communication ca- pacities, forming

Taura, Kenjiro

260

A Heuristic Algorithm for Mapping Communicating Tasks on Heterogeneous Resources  

E-Print Network (OSTI)

data­processing tasks onto heterogeneous resources (i.e., processors and links of various capacities) is presented. The algorithm tries to achieve a good throughput of the whole data­processing pipeline, taking of geographically distributed compute­ and data­resources connected with diverse communication ca­ pacities, forming

Chien, Andrew A.

Note: This page contains sample records for the topic "firm level heterogeneity" 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

A middleware-based approach for heterogeneous wireless sensor networks  

Science Conference Proceedings (OSTI)

Wireless sensor networks (WSN) are networked embedded systems that use small size devices with some processing and short-range radio communication capabilities for monitoring and controlling systems and environments. However, languages and IDE (Integrated ... Keywords: heterogeneous networks, middleware, wireless sensor networks

F. Graziosi; L. Pomante; D. Pacifico

2008-07-01T23:59:59.000Z

262

Homogeneous and heterogeneous breast phantoms for UWB imaging  

Science Conference Proceedings (OSTI)

This paper presents the fabrication of homogeneous and heterogeneous breast phantoms for experimental breast cancer detection use. The phantoms were developed for UWB imaging technique. The fabrication materials were affordable and the process was minimal. ... Keywords: breast phantom for UWB imaging, breast tissues dielectric property, early breast cancer detection

Saleh Alshehri; Sabira Khatun; Zaiki Awang

2011-10-01T23:59:59.000Z

263

WSN-inspired sleep protocols for heterogeneous LTE networks  

Science Conference Proceedings (OSTI)

The tremendous increase of the traffic demand in cellular networks imposes a massive densification of the traditional cellular infrastructure. The network architecture becomes heterogenous, in particular 4G networks where LTE micro eNodeBs are deployed ... Keywords: cellular network, energy optimization, switch off mechanisms, topology control

Iulia Tunaru, Hervé Rivano, Fabrice Valois

2013-11-01T23:59:59.000Z

264

Synapse: a scalable protocol for interconnecting heterogeneous overlay networks  

Science Conference Proceedings (OSTI)

This paper presents Synapse, a scalable protocol for information retrieval over the inter-connection of heterogeneous overlay networks. Applications on top of Synapse see those intra-overlay networks as a unique inter-overlay network. Scalability in ... Keywords: information retrieval, overlay networks, peer-to-peer

Luigi Liquori; Cédric Tedeschi; Laurent Vanni; Francesco Bongiovanni; Vincenzo Ciancaglini; Bojan Marinkovi?

2010-05-01T23:59:59.000Z

265

Modelling Heterogeneous Dispersion in Marginal Models for Longitudinal Proportional Data  

E-Print Network (OSTI)

the fitted curves for the pattern of dispersion profile over time across three different gas concentrationModelling Heterogeneous Dispersion in Marginal Models for Longitudinal Proportional Data Peter X proportional data assumes a constant dispersion para- meter. This assumption of dispersion homogeneity

Song, Peter X.

266

High pressure heterogeneous catalysis in a low pressure UHV environment  

SciTech Connect

The major thrust of our research is to carry out for the first time a heterogeneous catalytic reaction that normally is observed only at high pressures (>1 atm) of reactant gas at low pressures (<10{sup {minus}4} Torr) in an ultrahigh vacuum environment. The reaction we have chosen is the steam reforming of methane on a Ni(111) crystal.

Ceyer, S.T.

1990-01-01T23:59:59.000Z

267

Inference of tumor phylogenies from genomic assays on heterogeneous samples  

Science Conference Proceedings (OSTI)

Motivation: Tumorigenesis can in principle result from many combinations of mutations, but only a few roughly equivalent sequences of mutations, or "progression pathways", seem to account for most human tumors. There is hope that by cataloguing ... Keywords: array comparative genomic hybridization (aCGH), cancer, phylogenetics, tumor heterogeneity, tumor progression pathway, unmixing

Ayshwarya Subramanian; Stanley Shackney; Russell Schwartz

2011-08-01T23:59:59.000Z

268

The Effect of Heterogeneity on Matrix Acidizing of Carbonate Rocks  

E-Print Network (OSTI)

In matrix acidizing, the goal is to dissolve minerals in the rock to increase well productivity. This is accomplished by injecting an application-specific solution of acid into the formation at a pressure between the pore pressure and fracture pressure. A hydrochloric acid solution is used in carbonate reservoirs, which actually dissolves the calcite rock matrix in the form of conductive channels called wormholes. These wormholes propagate from the wellbore out into the reservoir, bypassing the damaged zone. In matrix acidizing of carbonates, there are four parameters that affect performance: the concentration of calcite present, injection rate of the acid, reaction type, and heterogeneity. Of these parameters, this paper will focus on how rock heterogeneity affects performance. To do this, a coreflood and acidizing apparatus was used to acidize heterogeneous limestone core samples. Rock characterizations and volumetric measurements were considered with the results from these experiments, which made it possible to correlate and quantify the results with rock and volume parameters. It was found that the core samples with more and larger heterogeneities generally required less acid (measured in pore volumes) to achieve breakthrough, that is, a wormhole created axially from one end of the core to the other. This value for pore volumes to breakthrough was one to two orders of magnitude less than more homogeneous samples. The general procedure and best practices for acidizing the core samples is also detailed in this thesis. This procedure was followed for preparation, coreflooding, and acidizing for all core samples.

Keys, Ryan S.

2009-12-01T23:59:59.000Z

269

Physics-based seismic hazard analysis on petascale heterogeneous supercomputers  

Science Conference Proceedings (OSTI)

We have developed a highly scalable and efficient GPU-based finite-difference code (AWP) for earthquake simulation that implements high throughput, memory locality, communication reduction and communication/computation overlap and achieves linear scalability ... Keywords: CyberShake, GPU, SCEC, earthquake ground motions, hybrid heterogeneous, seismic hazard analysis, weak scaling

Y. Cui, E. Poyraz, K. B. Olsen, J. Zhou, K. Withers, S. Callaghan, J. Larkin, C. Guest, D. Choi, A. Chourasia, Z. Shi, S. M. Day, P. J. Maechling, T. H. Jordan

2013-11-01T23:59:59.000Z

270

Upscaled flow and transport properties for heterogeneous unsaturated media  

E-Print Network (OSTI)

Federal Services, Richland, Washington, USA T.-C. Jim Yeh Department of Hydrology and Water Resources behavior at the field scale [Yeh, 1998]. However, to represent a heterogeneous medium by its homogeneous the effective properties for partially saturated media. Theoretical work [e.g., Mualem, 1984; Yeh et al., 1985a

Lu, Zhiming

271

Polymorphic Actor-Oriented Design for Heterogeneous Embedded Software  

E-Print Network (OSTI)

Polymorphic Actor-Oriented Design for Heterogeneous Embedded Software Center for Hybrid HPEC, Sept. 23, 2003 Boston, MA, USA #12;Chess, UC Berkeley, E. A. Lee 2 Actor-Oriented Design · Object orientation: class name data methods call return What flows through an object is sequential control · Actor

Kepner, Jeremy

272

Distributed gang scheduling in networks of heterogenous workstations  

Science Conference Proceedings (OSTI)

The wide availability of workstation networks and the rapid evolution of workstation technology is a motivation for investigating methods of harnessing the full power of such systems. Individual workstations are not usually effectively utilized by their ... Keywords: Concurrent processing, Dynamic scheduling, Heterogenous distributed systems, Migrations, Workstation networks

Khaled Al-Saqabi; Syed Sarwar; Kassem Saleh

1997-07-01T23:59:59.000Z

273

Leveraging Heterogeneity for Energy Minimization in Data Centers  

Science Conference Proceedings (OSTI)

Energy consumption in data centers is nowadays a critical objective because of its dramatic environmental and economic impact. Over the last years, several approaches have been proposed to tackle the energy/cost optimization problem, but most of them ... Keywords: heterogeneous data centers, energy-aware optimization, green computing

Marina Zapater; Jose L. Ayala; Jose M. Moya

2012-05-01T23:59:59.000Z

274

Microgrids and Heterogeneous Power Quality and Reliability: Matching the  

E-Print Network (OSTI)

LBNL-63524 Microgrids and Heterogeneous Power Quality and Reliability: Matching the Quality under review by the Transactions of the Industry Applications Society of IEE Japan 1 Microgrids of universal homogeneous supply upstream in the grid. Finally, the potential role of microgrids in delivering

275

Static Worksharing Strategies for Heterogeneous Computers with Unrecoverable Failures  

E-Print Network (OSTI)

Static Worksharing Strategies for Heterogeneous Computers with Unrecoverable Failures Anne Benoit1 computers that can assist in computing the workload. How can one best utilize the computers? Two features complicate this question. First, the remote computers may differ from one another in speed. Second, each

Paris-Sud XI, Université de

276

Application Deployment over Heterogeneous Grids using Distributed Ant  

E-Print Network (OSTI)

Application Deployment over Heterogeneous Grids using Distributed Ant Wojtek Goscinski and David in a secure, distributed, environment [2]. How- ever, a significant, unaddressed, challenge for Grid computing an automated applica- tion deployment system with a user-oriented approach, Distributed Ant (DistAnt) [3

Abramson, David

277

Characterization of oil and gas reservoir heterogeneity. Final report  

SciTech Connect

Research described In this report addresses the internal architecture of two specific reservoir types: restricted-platform carbonates and fluvial-deltaic sandstones. Together, these two reservoir types contain more than two-thirds of the unrecovered mobile oil remaining ill Texas. The approach followed in this study was to develop a strong understanding of the styles of heterogeneity of these reservoir types based on a detailed outcrop description and a translation of these findings into optimized recovery strategies in select subsurface analogs. Research targeted Grayburg Formation restricted-platform carbonate outcrops along the Algerita Escarpment and In Stone Canyon In southeastern New Mexico and Ferron deltaic sandstones in central Utah as analogs for the North Foster (Grayburg) and Lake Creek (Wilcox) units, respectively. In both settings, sequence-stratigraphic style profoundly influenced between-well architectural fabric and permeability structure. It is concluded that reservoirs of different depositional origins can therefore be categorized Into a ``heterogeneity matrix`` based on varying intensity of vertical and lateral heterogeneity. The utility of the matrix is that it allows prediction of the nature and location of remaining mobile oil. Highly stratified reservoirs such as the Grayburg, for example, will contain a large proportion of vertically bypassed oil; thus, an appropriate recovery strategy will be waterflood optimization and profile modification. Laterally heterogeneous reservoirs such as deltaic distributary systems would benefit from targeted infill drilling (possibly with horizontal wells) and improved areal sweep efficiency. Potential for advanced recovery of remaining mobile oil through heterogeneity-based advanced secondary recovery strategies In Texas is projected to be an Incremental 16 Bbbl. In the Lower 48 States this target may be as much as 45 Bbbl at low to moderate oil prices over the near- to mid-term.

Tyler, N.; Barton, M.D.; Bebout, D.G.; Fisher, R.S.; Grigsby, J.D.; Guevara, E.; Holtz, M.; Kerans, C.; Nance, H.S.; Levey, R.A.

1992-10-01T23:59:59.000Z

278

Dosimetric verification of the anisotropic analytical algorithm in lung equivalent heterogeneities with and without bone equivalent heterogeneities  

SciTech Connect

Purpose: In this study, the authors evaluated the accuracy of dose calculations performed by the convolution/superposition based anisotropic analytical algorithm (AAA) in lung equivalent heterogeneities with and without bone equivalent heterogeneities. Methods: Calculations of PDDs using the AAA and Monte Carlo simulations (MCNP4C) were compared to ionization chamber measurements with a heterogeneous phantom consisting of lung equivalent and bone equivalent materials. Both 6 and 10 MV photon beams of 4x4 and 10x10 cm{sup 2} field sizes were used for the simulations. Furthermore, changes of energy spectrum with depth for the heterogeneous phantom using MCNP were calculated. Results: The ionization chamber measurements and MCNP calculations in a lung equivalent phantom were in good agreement, having an average deviation of only 0.64{+-}0.45%. For both 6 and 10 MV beams, the average deviation was less than 2% for the 4x4 and 10x10 cm{sup 2} fields in the water-lung equivalent phantom and the 4x4 cm{sup 2} field in the water-lung-bone equivalent phantom. Maximum deviations for the 10x10 cm{sup 2} field in the lung equivalent phantom before and after the bone slab were 5.0% and 4.1%, respectively. The Monte Carlo simulation demonstrated an increase of the low-energy photon component in these regions, more for the 10x10 cm{sup 2} field compared to the 4x4 cm{sup 2} field. Conclusions: The low-energy photon by Monte Carlo simulation component increases sharply in larger fields when there is a significant presence of bone equivalent heterogeneities. This leads to great changes in the build-up and build-down at the interfaces of different density materials. The AAA calculation modeling of the effect is not deemed to be sufficiently accurate.

Ono, Kaoru; Endo, Satoru; Tanaka, Kenichi; Hoshi, Masaharu; Hirokawa, Yutaka [Department of Radiation Physics, Hiroshima Heiwa Clinic, 1-31 Kawaramachi, Naka-ku, Hiroshima 730-0856 (Japan); Quantum Energy Applications, Graduate School of Engineering, Hiroshima University, 4-1 Kagamiyama, Higashi-Hiroshima 730-8527 (Japan); Center of Medical Education, Sapporo Medical University, 17 Minami 1 Jo, Chuo-ku, Sapporo 060-8556 (Japan); Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553 (Japan); Department of Radiation Oncology, Hiroshima Heiwa Clinic, 1-31 Kawaramachi, Naka-ku, Hiroshima 730-0856 (Japan)

2010-08-15T23:59:59.000Z

279

Contention awareness and fault-tolerant scheduling for precedence constrained tasks in heterogeneous systems  

Science Conference Proceedings (OSTI)

Heterogeneous distributed systems are widely deployed for executing computationally intensive parallel applications with diverse computing needs. Such environments require effective scheduling strategies that take into account both algorithmic and architectural ... Keywords: Communication contention, Fault-tolerant scheduling, Heterogeneous systems

Anne Benoit; Mourad Hakem; Yves Robert

2009-02-01T23:59:59.000Z

280

Medical Knowledge Morphing: Towards Case-Specific Integration of Heterogeneous Medical Knowledge Resources  

E-Print Network (OSTI)

Medical Knowledge Morphing: Towards Case-Specific Integration of Heterogeneous Medical Knowledge interplay between various medical knowledge modalities--the spectrum of medical knowledge modalities morphing--a knowledge modeling task that allows the integration of heterogeneous medical knowledge

Abidi, Syed Sibte Raza

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Hybrid Dynamic Energy and Thermal Management in Heterogeneous Embedded Multiprocessor SoCs  

E-Print Network (OSTI)

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

Simunic, Tajana

282

ISHHC XIII International Symposium on the Relations betweenHomogeneous and Heterogeneous Catalysis  

SciTech Connect

The International Symposium on Relations between Homogeneous and Heterogeneous Catalysis (ISHHC) has a long and distinguished history. Since 1974, in Brussels, this event has been held in Lyon, France (1977), Groeningen, The Netherlands (1981); Asilomar, California (1983); Novosibirsk, Russia (1986); Pisa, Italy (1989); Tokyo, Japan (1992); Balatonfuered, Hungary (1995); Southampton, United Kingdom (1999); Lyon, France (2001); Evanston, Illinois (2001) and Florence, Italy (2005). The aim of this international conference in Berkeley is to bring together practitioners in the three fields of catalysis, heterogeneous, homogeneous and enzyme, which utilize mostly nanosize particles. Recent advances in instrumentation, synthesis and reaction studies permit the nanoscale characterization of the catalyst systems, often for the same reaction, under similar experimental conditions. It is hoped that this circumstance will permit the development of correlations of these three different fields of catalysis on the molecular level. To further this goal we aim to uncover and focus on common concepts that emerge from nanoscale studies of structures and dynamics of the three types of catalysts. Another area of focus that will be addressed is the impact on and correlation of nanosciences with catalysis. There is information on the electronic and atomic structures of nanoparticles and their dynamics that should have importance in catalyst design and catalytic activity and selectivity.

Somorjai (Ed.), G.A.

2007-06-11T23:59:59.000Z

283

A heterogeneous graphics procedure for visualization of massively parallel solutions  

SciTech Connect

Scientific visualization is playing an increasingly important role in the analysis and interpretation of massively parallel CFD simulations due to the enormous volume of data that can be generated on these machines. In this paper we will describe the development of a visualization technique based on a parallel analogue to the Marching Cubes algorithm. The algorithm has been developed for Multiple-Instruction, Multiple-Data (MIMD) massively parallel computers and is designed to take advantage of the heterogeneous programming capabilities of the MIMD architecture. We examine several different configurations and conclude that for producing animations the best one, in terms of both frame generation time and disk usage, is to run the two applications heterogeneously and send the resulting geometry description directly to a workstation for rendering, thereby totally eliminating the use of files from the animation process.

1993-01-01T23:59:59.000Z

284

A heterogeneous graphics procedure for visualization of massively parallel solutions  

SciTech Connect

Scientific visualization is playing an increasingly important role in the analysis and interpretation of massively parallel CFD simulations due to the enormous volume of data that can be generated on these machines. In this paper we will describe the development of a visualization technique based on a parallel analogue to the Marching Cubes algorithm. The algorithm has been developed for Multiple-Instruction, Multiple-Data (MIMD) massively parallel computers and is designed to take advantage of the heterogeneous programming capabilities of the MIMD architecture. We examine several different configurations and conclude that for producing animations the best one, in terms of both frame generation time and disk usage, is to run the two applications heterogeneously and send the resulting geometry description directly to a workstation for rendering, thereby totally eliminating the use of files from the animation process.

1993-03-01T23:59:59.000Z

285

Microgrids and Heterogeneous Security, Quality, Reliability, and Availability  

E-Print Network (OSTI)

Abstract--This paper describes two stylized alternative visions in popular currency of how the power system might evolve to meet future requirements for the high quality electricity service that modern digital economies demand, a supergrids paradigm and a dispersed paradigm. Some of the economics of the dispersed vision are explored. Economic perspectives are presented on both the choice of homogeneous universal power quality upstream in the electricity supply, and also on the extremely heterogeneous requirements of end-use loads. Finally, the potential role of microgrids in delivering heterogeneous power quality is demonstrated by reference to two ongoing microgrid tests in the U.S. and Japan. • Index Terms--cogeneration, dispersed storage and generation, power quality, power system economics I.

C. Marnay

2007-01-01T23:59:59.000Z

286

Mining Large Heterogeneous Graphs using Cray s Urika  

SciTech Connect

Pattern discovery and predictive modeling from seemingly related Big Data represented as massive, ad-hoc, heterogeneous networks (e.g., extremely large graphs with complex, possibly unknown structure) is an outstanding problem in many application domains. To address this problem, we are designing graph-mining algorithms capable of discovering relationship-patterns from such data and using those discovered patterns as features for classification and predictive modeling. Specifically, we are: (i) exploring statistical properties, mechanics and generative models of behavior patterns in heterogeneous information networks, (ii) developing novel, automated and scalable graph-pattern discovery algorithms and (iii) applying our relationship-analytics (data science + network science) expertise to domains spanning healthcare to homeland security.

Sukumar, Sreenivas R [ORNL] ORNL; Bond, Nathaniel A [ORNL] ORNL

2013-01-01T23:59:59.000Z

287

Correlating Spatial Heterogeneities in Porosity and Permeability with Metal  

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

Correlating Spatial Heterogeneities in Porosity and Permeability with Metal Correlating Spatial Heterogeneities in Porosity and Permeability with Metal Poisoning within an Individual Catalyst Particle using X-ray Microscopy Wednesday, August 21, 2013 - 1:30pm SLAC, Conference Room 137-226 Presented by Darius Morris, Stanford Synchrotron Radiation Lightsource Fluid catalytic cracking (FCC) is a refining process for converting large and/or heavy molecules of oil feedstock into smaller and lighter hydrocarbons such as gasoline. During the cracking process, metal contaminants from the oil feedstock deactivate and restrict access into the catalyst particle, thus reducing the yield of gasoline byproducts. Full-field transmission X-ray microscopy (TXM) has been used to determine the 3D composition and structure of an equilibrated (spent) FCC particle in

288

Defining and controlling the heterogeneity of a cluster: The Wrekavoc tool  

Science Conference Proceedings (OSTI)

The experimental validation and the testing of solutions that are designed for heterogeneous environments are challenging. We introduce Wrekavoc as an accurate tool for this purpose: it runs unmodified applications on emulated multi-site heterogeneous ... Keywords: Emulation, Heterogeneous systems, Performance modeling, Tool for experimentation

Louis-Claude Canon; Olivier Dubuisson; Jens Gustedt; Emmanuel Jeannot

2010-05-01T23:59:59.000Z

289

A behaviour-based control architecture for heterogeneous modular, multi-configurable, chained micro-robots  

Science Conference Proceedings (OSTI)

This article presents a new control architecture designed for heterogeneous modular, multi-configurable, chained micro-robots. This architecture attempts to fill the gap that exists in heterogeneous modular robotics research, in which little work has ... Keywords: Architecture, Behaviour-based, Control, Heterogeneous, Modular, Multi-configurable

A. Brunete; M. Hernando; E. Gambao; J. E. Torres

2012-12-01T23:59:59.000Z

290

Research Note: A high performance algorithm for static task scheduling in heterogeneous distributed computing systems  

Science Conference Proceedings (OSTI)

Effective task scheduling is essential for obtaining high performance in heterogeneous distributed computing systems (HeDCSs). However, finding an effective task schedule in HeDCSs requires the consideration of both the heterogeneity of processors and ... Keywords: Directed acyclic graph, Heterogeneous systems, Heuristics, Parallel processing, Task scheduling

Mohammad I. Daoud; Nawwaf Kharma

2008-04-01T23:59:59.000Z

291

A hybrid heuristic-genetic algorithm for task scheduling in heterogeneous processor networks  

Science Conference Proceedings (OSTI)

Efficient task scheduling on heterogeneous distributed computing systems (HeDCSs) requires the consideration of the heterogeneity of processors and the inter-processor communication. This paper presents a two-phase algorithm, called H2GS, for task scheduling ... Keywords: Directed acyclic graph, Genetic algorithms, Heterogeneous systems, List-based scheduling heuristics, Parallel and distributed processing, Task scheduling

Mohammad I. Daoud; Nawwaf Kharma

2011-11-01T23:59:59.000Z

292

A novel terminal-controlled handover scheme in heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

In the next generation heterogeneous wireless networks, a mobile terminal (MT) with a multi-interface may have network access from different service providers using various technologies. In spite of this heterogeneity, seamless intersystem mobility is ... Keywords: Fuzzy logic, Handover, Heterogeneous networks

Xu Haibo; Tian Hui; Zhang Ping

2010-03-01T23:59:59.000Z

293

Learning with Heterogeneous Expectations in an Evolutionary World  

E-Print Network (OSTI)

65, 1059-1095. [6] De Grauwe, P.,Dewachter, H.,Embrechts, M. (1993) Exchange Rate Theory: Chaotic Models of Foreign Exchange Markets. Blackwell Publishers, Oxford, UK. [7] Evans, G., Honkapohja, S. (1997) ?Least Squares Learning with Heterogenous... Expectations?, Economic Letters 52, 197-201. [8] Evans, G., Honkapohja, S. (2001) Learning and Expectations in Macroeconomics, Princeton University Press, Princeton, NJ. [9] Evans, G., Honkapohja, S.,Marimon, R. (2001) ?Convergence in Monetary In?ation Models...

Guse, Eran A

2006-03-14T23:59:59.000Z

294

Modification of heterogeneous chemistry by complex substrate morphology  

Science Conference Proceedings (OSTI)

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Chemistry in many environmental systems is determined at some stage by heterogeneous reaction with a surface. Typically the surface exists as a dispersion or matrix of particulate matter or pores, and a determination of the heterogeneous chemistry of the system must address the extent to which the complexity of the environmental surface affects the reaction rates. Reactions that are of current interest are the series of chlorine nitrate reactions important in polar ozone depletion. The authors have applied surface spectroscopic techniques developed at LANL to address the chemistry of chlorine nitrate reactions on porous nitric and sulfuric acid ice surfaces as a model study of the measurement of complex, heterogeneous reaction rates. The result of the study is an experimental determination of the surface coverage of one adsorbed reagent and a mechanism of reactivity based on the dependence of this coverage on temperature and vapor pressure. The resulting mechanism allows the first comprehensive modeling of chlorine nitrate reaction probability data from several laboratories.

Henson, B.F.; Buelow, S.J.; Robinson, J.M.

1998-12-31T23:59:59.000Z

295

Heterogeneous composite bodies with isolated lenticular shaped cermet regions  

SciTech Connect

A heterogeneous body having ceramic rich cermet regions in a more ductile metal matrix. The heterogeneous bodies are formed by thermal spray operations on metal substrates. The thermal spray operations apply heat to a cermet powder and project it onto a solid substrate. The cermet powder is composed of complex composite particles in which a complex ceramic-metallic core particle is coated with a matrix precursor. The cermet regions are generally comprised of complex ceramic-metallic composites that correspond approximately to the core particles. The cermet regions are approximately lenticular shaped with an average width that is at least approximately twice the average thickness. The cermet regions are imbedded within the matrix phase and generally isolated from one another. They have obverse and reverse surfaces. The matrix phase is formed from the matrix precursor coating on the core particles. The amount of heat applied during the formation of the heterogeneous body is controlled so that the core particles soften but do not become so fluid that they disperse throughout the matrix phase. The force of the impact on the surface of the substrate tends to flatten them. The flattened cermet regions tend to be approximately aligned with one another in the body.

Sherman, Andrew J. (Cirtland Hills, OH)

2009-12-22T23:59:59.000Z

296

On the Valuation of Warrants and Executive Stock Options: Pricing Formulae for Firms with Multiple Warrants/Executive Options  

E-Print Network (OSTI)

of the options or canceling an executive's existing options and granting him or her new options with a lower strike price, although not as frequent, are also in the agenda. Among others, Brenner, Sundaram, and Yermack (2000), Carter and Lynch (2001) examine... the “repricing” of ESOs and allocate it to poor firm-specific performance. The empirical evidence in Chance, Kumar, and Todd (2000) suggest that ESOs are usually repriced when the stock declines by about 25%. Acharya, John, and Sundaram (2000) investigate...

Darsinos, Theofanis; Satchell, Stephen E

2004-06-16T23:59:59.000Z

297

Agent-Based Modeling for Competing Firms: From Balanced Scorecards to Multi-Objective Strategies  

E-Print Network (OSTI)

This paper proposes a novel method for agentbased modeling in business management domain. We will model competing companies with the Balanced Scorecards principle and examine their Value Proposition strategies for customers. The proposed method is characterized by (1) Designing decision making agents or competing companies with strategic parameters to be optimized; (2) Employing a multiobjective optimization framework with Genetic Algorithms to evolve the artificial simulated society; (3) Grounding the simulation conditions and results with marketing survey data in the real world, and (4) Validating the strategic parameters of the agents after simulation via statistical analysis of the individual genes. The objective of our agent-based modeling is to explore 'optimal ' marketing strategies on given specific markets. Competing companies will thrive by choosing their customers, narrowing their focus, and dominating their markets. We will uncover which type of companies provide good value propositions for customers from their activities. Conventional research in business strategy literature states the importance of translating the strategy of a company into action to get the profit. In our study, on the contrary, we will observe agents ' actions or companies ' activities in the artificial society with given conditions and investigate the agents ' or companies ' strategy. From intensive experiments using our agent-based simulator in a television set market, we have observed that 1) the price and service are important for benefit and cash flow maximization; 2) there are few dominant strategies for share maximizaiton; 3) price and time will affect borrowing strategy, and 4) time is an important factor in a radio cassettes market. These results have suggested that our framework works well to analyze behaviors and strategies of competing firms. 1.

Takao Terano; Kenichi Naitoh

2004-01-01T23:59:59.000Z

298

Development of a farm-firm modelling system for evaluation of herbaceous energy crops  

DOE Green Energy (OSTI)

A complete analysis is performed to simulate biomass production incorporated into a realistic whole farm situation, including or replacing a typical crop mix. Representative farms are constructed to accommodate such simulation. Four management systems are simulated for each firm, with each simulation depicting a different crop mix and/or use of different farming technologies and production methods. The first simulation was a base farm plan in which the operator would maintain the historical crop mix for the area, participate in all price support programs, and not participate in either a conservative reserve or a biomass production program. In the second simulation, the operator would again maintain the historical crop mix, would not participate in a conservation reserve or biomass production program, and would be ineligible to participate in any price support system. The third simulation introduced the Conservation Reserve Program (CRP) and included participation in all price support programs. The fourth simulation introduced a biomass crop production enterprise (switchgrass) as an alternative to enrolling highly erodible cropland in the CRP and allowed participation in price support programs. Simulations were made for three farms, two in West Tennessee and on in South Georgia. Results indicate that erosion is likely to be reduced more by the diversion of cropland to permanent vegetative cover on farms similar to the more highly erodible West Tennessee farms than on the less erodible Tift County, Georgia farm. Equivalent reductions in erosion rates result from entering highly erodible cropland in the CRP and from production of switchgrass as a biomass energy crop. Both switchgrass and CRP farm plans result in decreased net returns from the base plan, although the biomass farm plans are, in general, more profitable than the CRP plans.

English, B.C.; Alexander, R.R.; Loewen, K.H.; Coady, S.A.; Cole, G.V.; Goodman, W.R. (Tennessee Univ., Knoxville, TN (United States). Dept. of Agricultural Economics and Rural Sociology)

1992-01-01T23:59:59.000Z

299

Architecture-Aware Algorithms for Scalable Performance and Resilience on Heterogeneous Architectures  

SciTech Connect

The goal of the Extreme-scale Algorithms & Software Institute (EASI) is to close the ?application-architecture performance gap? by exploring algorithms and runtime improvements that will enable key science applications to better exploit the architectural features of DOE extreme-scale systems. For the past year of the project, our efforts at the University of Tennessee have concentrated on, and made significant progress related to, the following high-level EASI goals: ? Develop multi-precision and architecture-aware implementations of Krylov, Poisson, Helmholtz solvers, and dense factorizations for heterogeneous multi-core systems; ? Explore new methods of algorithm resilience, and develop new algorithms with these capabilities; ? Develop runtime support for adaptable algorithms that are dealing with resilience, scalability; ? Distribute the new algorithms and runtime support through widely used software packages; ? Establish a strong outreach program to disseminate results, interact with colleagues and train students and junior members of our community.

Dongarra, Jack [University of Tennessee, Knoxville] [University of Tennessee, Knoxville

2013-10-15T23:59:59.000Z

300

www.mdpi.com/journal/ijms Integrated-Omics: A Powerful Approach to Understanding the Heterogeneous Lignification of Fibre Crops  

E-Print Network (OSTI)

Abstract: Lignin and cellulose represent the two main components of plant secondary walls and the most abundant polymers on Earth. Quantitatively one of the principal products of the phenylpropanoid pathway, lignin confers high mechanical strength and hydrophobicity to plant walls, thus enabling erect growth and high-pressure water transport in the vessels. Lignin is characterized by a high natural heterogeneity in its composition and abundance in plant secondary cell walls, even in the different tissues of the same plant. A typical example is the stem of fibre crops, which shows a lignified core enveloped by a cellulosic, lignin-poor cortex. Despite the great value of fibre crops for humanity, however, still little is known on the mechanisms controlling their cell wall biogenesis, and particularly, what regulates their spatially-defined lignification pattern. Given the chemical complexity and the heterogeneous composition of fibre crops ’ secondary walls, only the use of multidisciplinary approaches can convey an integrated picture and provide exhaustive information covering different levels of biological complexity. The present review highlights the importance of combining high throughput-omics approaches to get a complete understanding of the factors regulating the lignification heterogeneity typical of fibre crops.

Guerriero Gea; Sergeant Kjell; Hausman Jean-françois

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

A Multi-Level Theory Approach to Understanding Price Rigidity in Internet Retailing  

E-Print Network (OSTI)

Price rigidity involves prices that do not change with the regularity predicted by standard economic theory, and is of long-standing interest to firms and industries, and our understanding of the economy as a whole. The previous IS literature has failed to identify the central role of IT and Internet retailing-related technologies to explain the rigidity of prices on the Internet. Instead, it has offered only limited explanations, such as menu costs and tacit collusion. These ideas, and quite a few other key theoretical perspectives were formulated in disciplines other than ours. Thus, the issue of price rigidity and price adjustment in Internet retailing should be given more scrutiny than the literature has provided to date. We review and synthesize what we know about price rigidity in non-electronic retailing contexts using a multi-level theory approach that identifies three unique levels of analysis: the firm-specific level, the firm-to-consumer level, and the firm-to-market level. We evaluate to what extent this knowledge is applicable to explain price-setting and price adjustment on the Internet. We conclude that there should not be less price rigidity in Internet retailing than in traditional retailing – even though the Internet is involved. To this end, we recommend a multi-level variance theory of Internet-based price rigidity. This study provides a foundation for the development of new theoretical perspectives at the crossroads of the academic disciplines of marketing, economics and IS. It encourages research that is able to probe for a deeper understanding of new economic phenomena associated with the digital economy’s growth.

Robert J. Kauffman; Dongwon Lee

2010-01-01T23:59:59.000Z

302

MRI of Heterogeneous Hydrogenation Reactions Using Parahydrogen Polarization  

SciTech Connect

The power of magnetic resonance imaging (MRI) is its ability to image the internal structure of optically opaque samples and provide detailed maps of a variety of important parameters, such as density, diffusion, velocity and temperature. However, one of the fundamental limitations of this technique is its inherent low sensitivity. For example, the low signal to noise ratio (SNR) is particularly problematic for imaging gases in porous materials due to the low density of the gas and the large volume occluded by the porous material. This is unfortunate, as many industrially relevant chemical reactions take place at gas-surface interfaces in porous media, such as packed catalyst beds. Because of this severe SNR problem, many techniques have been developed to directly increase the signal strength. These techniques work by manipulating the nuclear spin populations to produce polarized} (i.e., non-equilibrium) states with resulting signal strengths that are orders of magnitude larger than those available at thermal equilibrium. This dissertation is concerned with an extension of a polarization technique based on the properties of parahydrogen. Specifically, I report on the novel use of heterogeneous catalysis to produce parahydrogen induced polarization and applications of this new technique to gas phase MRI and the characterization of micro-reactors. First, I provide an overview of nuclear magnetic resonance (NMR) and how parahydrogen is used to improve the SNR of the NMR signal. I then present experimental results demonstrating that it is possible to use heterogeneous catalysis to produce parahydrogen-induced polarization. These results are extended to imaging void spaces using a parahydrogen polarized gas. In the second half of this dissertation, I demonstrate the use of parahydrogen-polarized gas-phase MRI for characterizing catalytic microreactors. Specifically, I show how the improved SNR allows one to map parameters important for characterizing the heat and mass transport in a heterogeneous catalyst bed. This is followed by appendices containing detailed information regarding the design and use of my experimental setup.

Burt, Scott R; Burt, Scott R.

2008-06-25T23:59:59.000Z

303

Microgrids and Heterogeneous Security, Quality, Reliability, andAvailability  

Science Conference Proceedings (OSTI)

This paper describes two stylized alternative visions inpopular currencyof how the power system might evolve to meet futurerequirements for the high quality electricity service that modern digitaleconomies demand, a supergrids paradigm and a dispersed paradigm. Some ofthe economics of the dispersed vision are explored. Economic perspectivesare presented on both the choice of homogeneous universal power qualityupstream in the electricity supply, and also on the extremelyheterogeneous require-ments of end-use loads. Finally, the potential roleof microgrids in delivering heterogeneous power quality is demonstratedby reference to two ongoing microgrid tests in the U.S. andJapan.

Marnay, Chris

2007-01-31T23:59:59.000Z

304

Covariance Matrix Estimation for the Cryo-EM Heterogeneity Problem  

E-Print Network (OSTI)

In cryo-electron microscopy (cryo-EM), a microscope generates a top view of a sample of randomly-oriented copies of a molecule. The cryo-EM problem is to use the resulting set of noisy 2D projection images taken at unknown directions to reconstruct the 3D structure of the molecule. In some situations, the molecule under examination exhibits structural variability, which poses a fundamental challenge in cryo-EM. The heterogeneity problem is the task of mapping the space of conformational states of a molecule. It has been previously shown that the leading eigenvectors of the covariance matrix of the 3D molecules can be used to solve the heterogeneity problem. Estimating the covariance matrix is however challenging, since only projections of the molecules are observed, but not the molecules themselves. In this paper, we derive an estimator for the covariance matrix as a solution to a certain linear system. The linear operator to be inverted, which we term the tomographic covariance transform, is an important obj...

Katsevich, Gene; Singer, Amit

2013-01-01T23:59:59.000Z

305

OH-initiated heterogeneous aging of highly oxidized organic aerosol  

Science Conference Proceedings (OSTI)

The oxidative evolution (“aging”) of organic species in the atmosphere is thought to have a major influence on the composition and properties of organic particulate matter, but remains poorly understood, particularly for the most oxidized fraction of the aerosol. Here we measure the kinetics and products of the heterogeneous oxidation of highly oxidized organic aerosol, with an aim of better constraining such atmospheric aging processes. Submicron particles composed of model oxidized organics—1,2,3,4-butanetetracarboxylic acid (C{sub 8}H{sub 10}O{sub 8}), citric acid (C{sub 6}H{sub 8}O{sub 7}), tartaric acid (C{sub 4}H{sub 6}O{sub 6}), and Suwannee River fulvic acid—were oxidized by gas-phase OH in a flow reactor, and the masses and elemental composition of the particles were monitored as a function of OH exposure. In contrast to our previous studies of less-oxidized model systems (squalane, erythritol, and levoglucosan), particle mass did not decrease significantly with heterogeneous oxidation. Carbon content of the aerosol always decreased somewhat, but this mass loss was approximately balanced by an increase in oxygen content. The estimated reactive uptake coefficients of the reactions range from 0.37 to 0.51 and indicate that such transformations occur at rates corresponding to 1-2 weeks in the atmosphere, suggesting their importance in the atmospheric lifecycle of organic particulate matter.

Kessler, Sean H.; Nah, Theodora; Daumit, Kelly E.; Smith, Jared D.; Leone, Stephen R.; Kolb, Charles E.; Worsnop, Douglas R.; Wilson, Kevin R.; Kroll, Jesse H.

2011-12-05T23:59:59.000Z

306

Transport in quenched disorder: light diffusion in strongly heterogeneous turbid media  

E-Print Network (OSTI)

We present a theoretical and experimental study of light transport in disordered media with strongly heterogeneous distribution of scatterers formed via non-scattering regions. Step correlations induced by quenched disorder are found to prevent diffusivity from diverging with increasing heterogeneity scale, contrary to expectations from annealed models. Spectral diffusivity is measured for a porous ceramic where nanopores act as scatterers and macropores render their distribution heterogeneous. Results agree well with Monte Carlo simulations and a proposed analytical model.

Svensson, Tomas; Adolfsson, Erik; Farina, Andrea; Pifferi, Antonio; Wiersma, Diederik S

2013-01-01T23:59:59.000Z

307

A Three Dimensional Heterogeneous Coarse Mesh Transport Method for Reactor Calculations.  

E-Print Network (OSTI)

??Current advancements in nuclear reactor core design are pushing reactor cores towards greater heterogeneity in an attempt to make nuclear power more sustainable in terms… (more)

Forget, Benoit

2006-01-01T23:59:59.000Z

308

Energy-Aware Task Partitioning on Heterogeneous Multiprocessor Platforms  

E-Print Network (OSTI)

Efficient task partitioning plays a crucial role in achieving high performance at multiprocessor plat forms. This paper addresses the problem of energy-aware static partitioning of periodic real-time tasks on heterogeneous multiprocessor platforms. A Particle Swarm Optimization variant based on Min-min technique for task partitioning is proposed. The proposed approach aims to minimize the overall energy consumption, meanwhile avoid deadline violations. An energy-aware cost function is proposed to be considered in the proposed approach. Extensive simulations and comparisons are conducted in order to validate the effectiveness of the proposed technique. The achieved results demonstrate that the proposed partitioning scheme significantly surpasses previous approaches in terms of both number of iterations and energy savings.

Saad, Elsayed; Shalan, Mohamed; Elewi, Abdullah

2012-01-01T23:59:59.000Z

309

Cryogenic Homogenization and Sampling of Heterogeneous Multi-Phase Feedstock  

DOE Patents (OSTI)

An apparatus and process for producing a homogeneous analytical sample from a heterogeneous feedstock by: providing the mixed feedstock, reducing the temperature of the feedstock to a temperature below a critical temperature, reducing the size of the feedstock components, blending the reduced size feedstock to form a homogeneous mixture; and obtaining a representative sample of the homogeneous mixture. The size reduction and blending steps are performed at temperatures below the critical temperature in order to retain organic compounds in the form of solvents, oils, or liquids that may be adsorbed onto or absorbed into the solid components of the mixture, while also improving the efficiency of the size reduction. Preferably, the critical temperature is less than 77K (-196 C). Further, with the process of this invention the representative sample maybe maintained below the critical temperature until being analyzed.

Doyle, Glenn M.; Ideker, Virgene D.; Siegwarth, James D.

1999-09-21T23:59:59.000Z

310

Molecular surface science of heterogeneous catalysis. History and perspective  

DOE Green Energy (OSTI)

A personal account is given of how the author became involved with modern surface science and how it was employed for studies of the chemistry of surfaces and heterogeneous catalysis. New techniques were developed for studying the properties of the surface monolayers: Auger electron spectroscopy, LEED, XPS, molecular beam surface scattering, etc. An apparatus was developed and used to study hydrocarbon conversion reactions on Pt, CO hydrogenation on Rh and Fe, and NH/sub 3/ synthesis on Fe. A model has been developed for the working Pt reforming catalyst. The three molecular ingredients that control catalytic properties are atomic surface structure, an active carbonaceous deposit, and the proper oxidation state of surface atoms. 40 references, 21 figures. (DLC)

Somorjai, G.A.

1983-08-01T23:59:59.000Z

311

A Massively Parallel Adaptive Fast Multipole Method on Heterogeneous Architectures  

Science Conference Proceedings (OSTI)

We describe a parallel fast multipole method (FMM) for highly nonuniform distributions of particles. We employ both distributed memory parallelism (via MPI) and shared memory parallelism (via OpenMP and GPU acceleration) to rapidly evaluate two-body nonoscillatory potentials in three dimensions on heterogeneous high performance computing architectures. We have performed scalability tests with up to 30 billion particles on 196,608 cores on the AMD/CRAY-based Jaguar system at ORNL. On a GPU-enabled system (NSF's Keeneland at Georgia Tech/ORNL), we observed 30x speedup over a single core CPU and 7x speedup over a multicore CPU implementation. By combining GPUs with MPI, we achieve less than 10 ns/particle and six digits of accuracy for a run with 48 million nonuniformly distributed particles on 192 GPUs.

Lashuk, Ilya [Lawrence Livermore National Laboratory (LLNL); Chandramowlishwaran, Aparna [Georgia Institute of Technology; Langston, Harper [Georgia Institute of Technology; Nguyen, Tuan-Anh [Georgia Institute of Technology; Sampath, Rahul S [ORNL; Shringarpure, Aashay [Georgia Institute of Technology; Vuduc, Richard [Georgia Institute of Technology; Ying, Lexing [University of Texas, Austin; Zorin, Denis [New York University; Biros, George [University of Texas, Austin

2012-01-01T23:59:59.000Z

312

Interface limited growth of heterogeneously nucleated ice in supercooled water  

E-Print Network (OSTI)

Heterogeneous ice growth exhibits a maximum in freezing rate arising from the competition between kinetics and the thermodynamic driving force between the solid and liquid states. Here, we use molecular dynamics simulations to elucidate the atomistic details of this competition, focusing on water properties in the interfacial region along the secondary prismatic direction. The crystal growth velocity is maximized when the efficiency of converting interfacial water molecules to ice, collectively known as the attachment kinetics, is greatest. We find water molecules that contact the intermediate ice layer in concave regions along the atomistically roughened surface are more likely to freeze directly. The increased roughening of the solid surface at large undercoolings consequently plays an important limiting role on the rate of ice growth, as water molecules are unable to integrate into increasingly deeper surface pockets. These results provide insights into the molecular mechanisms for self-assembly of solid phases that are important in many biological and atmospheric processes.

Razvan A. Nistor; Thomas E. Markland; B. J. Berne

2013-08-29T23:59:59.000Z

313

Precipitation of heterogeneous nanostructures: Metal nanoparticles and dielectric nanocrystallites  

Science Conference Proceedings (OSTI)

Heterogeneous precipitation of nanocrystallites of metallic Bi and anatase was observed in CaO-Bi{sub 2}O{sub 3}-B{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-TiO{sub 2} glass-ceramics. Addition of AlN reduced the Bi{sub 2}O{sub 3} to Bi metal nanoparticles, which were uniformly dispersed in the glass. After heat-treatment of the Bi-precipitated glass around the glass transition temperature, nanocrystalline anatase precipitated out without aggregation of the Bi metal particles. It was found that the anatase nanocrystal size was affected by the distance between a nanocrystal and a precipitated Bi nanoparticle. The glass-ceramic produced is a functional material containing a random dispersion of different types of nanoparticles with different dielectric constants.

Masai, Hirokazu; Takahashi, Yoshihiro; Fujiwara, Takumi [Department of Applied Physics, Tohoku University, 6-6-05, Aoba, Aoba-ku, Sendai 980-8579 (Japan); Tokuda, Yomei; Yoko, Toshinobu [Institute for Chemical Research, Kyoto University, Gokasyo, Uji, Kyoto 611-0011 (Japan)

2010-07-15T23:59:59.000Z

314

On fluid flow in a heterogeneous medium under nonisothermal conditions  

SciTech Connect

An asymptotic technique, valid in the presence of smoothly-varying heterogeneity, provides explicit expressions for the velocity of a propagating pressure and temperature disturbance. The governing equations contain nonlinear terms due to the presence of temperature-dependent coefficients and due to the advection of fluids with differing temperatures. Two cases give well-defined expressions in terms of the parameters of the porous medium: the uncoupled propagation of a pressure disturbance and the propagation of a fully coupled temperature and pressure disturbance. The velocity of the coupled disturbance or front, depends upon the medium parameters and upon the change in temperature and pressure across the front. For uncoupled flow, the semi-analytic expression for the front velocity reduces to that associated with a linear diffusion equation. A comparison of the asymptotic travel time estimates with calculations from a numerical simulator indicates reasonably good agreement for both uncoupled and coupled disturbances.

D.W., Vasco

2010-11-01T23:59:59.000Z

315

Heterogeneous seepage at the Nopal I natural analogue site, Chihuahua, Mexico  

SciTech Connect

An integrated field, laboratory, and modeling study of the Pena Blanca (Chihuahua, Mexico) natural analogue site is being conducted to evaluate processes that control the mobilization and transport of radionuclides from a uranium ore deposit. One component of this study is an evaluation of the potential for radionuclide transport through the unsaturated zone (UZ) via a seepage study in an adit at the Nopal I uranium mine, excavated 10 m below a mined level surface. Seasonal rainfall on the exposed level surface infiltrates into the fractured rhyolitic ash-flow tuff and seeps into the adit. An instrumented seepage collection system and local automated weather station permit direct correlation between local precipitation events and seepage within the Nopal I +00 adit. Monitoring of seepage within the adit between April 2005 and December 2006 indicates that seepage is highly heterogeneous with respect to time, location, and quantity. Within the back adit area, a few zones where large volumes of water have been collected are linked to fast flow path fractures (0-4 h transit times) presumably associated with focused flow. In most locations, however, there is a 1-6 month time lag between major precipitation events and seepage within the adit, with longer residence times observed for the front adit area. Seepage data obtained from this study will be used to provide input to flow and transport models being developed for the Nopal I hydrogeologic system.

Dobson, Patrick F.; Cook, Paul J.; Ghezzehei, Teamrat A.; Rodriguez, J. Alfredo; Villalba, Lourdes; de la Garza, Rodrigo

2008-10-25T23:59:59.000Z

316

Adaptive subcarrier and bit allocation in OFDMA systems supporting heterogeneous services  

Science Conference Proceedings (OSTI)

Orthogonal Frequency Division Multiple Access (OFDMA) is an efficient multiple access method for the future wireless systems. This paper studies the adaptive subcarrier and bit allocation problem in OFDMA systems to support heterogeneous services. The ... Keywords: Adaptive subcarrier and bit allocation, Fairness, Heterogeneous services, OFDMA, QoS

Guanding Yu; Zhaoyang Zhang; Peiliang Qiu

2007-12-01T23:59:59.000Z

317

Reliability evaluation and optimal design in heterogeneous multi-state series-parallel systems  

Science Conference Proceedings (OSTI)

This paper addresses the heterogeneous redundancy allocation problem in multi-state series-parallel reliability structures with the objective to minimize the total cost of system design satisfying the given reliability constraint and the consumer load ... Keywords: Ant colony optimization, Heterogeneous redundancy optimization, Multi-state, Series-parallel system

Vikas K. Sharma; Manju Agarwal; Kanwar Sen

2011-01-01T23:59:59.000Z

318

Heterogeneous reactions in aircraft gas turbine engines R. C. Brown and R. C. Miake-Lye  

E-Print Network (OSTI)

Heterogeneous reactions in aircraft gas turbine engines R. C. Brown and R. C. Miake-Lye Aerodyne to estimate the maximum effect of heterogeneous reactions on trace species evolution in aircraft gas turbines species emissions from gas turbine engines are of interest because of environmental and human health

Waitz, Ian A.

319

Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland  

E-Print Network (OSTI)

Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south. Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland. e ICES Journal of Marine Science, 63: 1111e1117. Atlantic bluefin tuna (Thunnus thynnus

Hilton, Eric J.

320

Improving grid performance through processor allocation considering both speed heterogeneity and resource fragmentation  

Science Conference Proceedings (OSTI)

Grid performance are usually measured by the average turnaround time of all jobs in the system. A job's turnaround time consists of two parts: queue waiting time and actual execution time, which in a heterogeneous grid environment, are severely affected ... Keywords: Grid, Processor allocation, Resource fragmentation, Speed heterogeneity

Po-Chi Shih; Kuo-Chan Huang; Yeh-Ching Chung

2012-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Modeling and optimization for the joint replenishment and delivery problem with heterogeneous items  

Science Conference Proceedings (OSTI)

In the real world, some heterogeneous items are prohibited from being transported together or penalty cost occurs when transporting them together. This paper firstly proposes the joint replenishment and delivery (JRD) model where a warehouse procures ... Keywords: Adaptive hybrid differential evolution, Delivery, Genetic algorithm, Heterogeneous items, Joint replenishment

Hui Qu, Lin Wang, Yu-Rong Zeng

2013-12-01T23:59:59.000Z

322

Heterogeneous demand responses to discrete price changes: an application to the purchase of lottery tickets  

Science Conference Proceedings (OSTI)

During the survey period of any household expenditure survey price variations may occur. Such variation can be used to identify heterogeneous demand responses to price changes. This is feasible because expenditure surveys usually contain a large number ... Keywords: Expectation/maximisation algorithm, Lottery, Poisson distribution, Unobserved heterogeneity

Roger Hartley; Gauthier Lanot

2006-02-01T23:59:59.000Z

323

Toward power-aware computing with dynamic voltage scaling for heterogeneous platforms  

Science Conference Proceedings (OSTI)

Energy conservation is a dynamic topic of research in High Performance Computing and Cluster Computing. Power-aware computing for heterogeneous world-wide Grid is a new track of research. In this work, we study and evaluate the impact of the heterogeneity ...

Laurent Choy; Serge G. Petiton; Mitsuhisa Sato

2007-09-01T23:59:59.000Z

324

A survey on hardware-aware and heterogeneous computing on multicore processors and accelerators  

Science Conference Proceedings (OSTI)

In the last few years, the landscape of parallel computing has been subject to profound and highly dynamic changes. The paradigm shift towards multicore and manycore technologies coupled with accelerators in a heterogeneous environment is offering a ... Keywords: accelerators, hardware-aware computing, heterogeneity, multicore and manycore processors, numerical simulation, parallel programming

Rainer Buchty; Vincent Heuveline; Wolfgang Karl; Jan-Philipp Weiss

2012-05-01T23:59:59.000Z

325

Supporting Dynamic Spectrum Access in Heterogeneous LTE+ Networks  

SciTech Connect

As early as 2014, mobile network operators’ spectral capac- ity is expected to be overwhelmed by the demand brought on by new devices and applications. With Long Term Evo- lution Advanced (LTE+) networks likely as the future one world 4G standard, network operators may need to deploy a Dynamic Spectrum Access (DSA) overlay in Heterogeneous Networks (HetNets) to extend coverage, increase spectrum efficiency, and increase the capacity of these networks. In this paper, we propose three new management frameworks for DSA in an LTE+ HetNet: Spectrum Accountability Client, Cell Spectrum Management, and Domain Spectrum Man- agement. For these spectrum management frameworks, we define protocol interfaces and operational signaling scenar- ios to support cooperative sensing, spectrum lease manage- ment, and alarm scenarios for rule adjustment. We also quan- tify, through integer programs, the benefits of using DSA in an LTE+ HetNet, that can opportunistically reuse vacant TV and GSM spectrum. Using integer programs, we consider a topology using Geographic Information System data from the Blacksburg, VA metro area to assess the realistic benefits of DSA in an LTE+ HetNet.

Luiz A. DaSilva; Ryan E. Irwin; Mike Benonis

2012-08-01T23:59:59.000Z

326

Resource provisioning of Web applications in heterogeneous clouds  

E-Print Network (OSTI)

Cloud computing platforms provide very little guarantees regarding the performance of seemingly identical virtual machine instances. Such instances have been shown to exhibit significantly different performance from each other. This heterogeneity creates two challenges when hosting multi-tier Web applications in the Cloud. First, different machine instances have different processing capacity so balancing equal amounts of load to different instances leads to poor performance. Second, when an application must be reprovisioned, depending on the performance characteristics of the new machine instance it may be more beneficial to add the instance to one tier or another. This paper shows how we can efficiently benchmark the individual performance profile of each individual virtual machine instance when we obtain it from the Cloud. These performance profiles allow us to balance the request load more efficiently than standard load balancers, leading to better performance at lower costs. The performance profiles also allow us to predict the performance that the overall application would have if the new machine instance would be added to any of the application tiers, and therefore to decide how to make best use of newly acquired machine instances. We demonstrate the effectiveness of our techniques by provisioning the TPC-W e-commerce benchmark in the Amazon EC2 platform. 1

Jiang Dejun; Chi-hung Chi

2011-01-01T23:59:59.000Z

327

Chemical Speciation of Heterogeneously Reduced Pu in Synthetic Brines  

Science Conference Proceedings (OSTI)

X-ray absorption fine structure (XAFS) spectroscopy has been used to determine the speciation of Pu precipitates prepared by the heterogeneous reduction of Pu(VI) with Al and Fe in 5M NaCl and an ERDA-6 brine, a simulant from the Waste Isolation Pilot Plant in Carlsbad, New Mexico. NaOCl was added to some of these solutions to determine its effect on Pu speciation. Analysis of the Pu LIII spectra showed that all solids consisted of PuO2+x?y(OH)2y •zH2O, compounds with characteristics identical to those prepared by hydrolysis and with Pu?O and Pu?Pu distances identical to those treated at elevated temperature. Additionally, reduction with Al gave compounds with different site distributions than reduction with Fe, and reduction with Al or the addition of NaOCl appeared to suppress the formation of oxo groups and their associated Pu(V) sites.

Ding, Mei; Conca, James L.; Den Auwer, Christophe J.; Gabitov, Rinat I.; Hess, Nancy J.; Paviet-Hartmann, Patricia; Palmer, Phillip D.; LoPresti, Vin; Conradson, Steven D.

2006-07-01T23:59:59.000Z

328

Measurement of fragmentation and functionalization pathways in the multistep heterogeneous oxidation of organic aerosol  

DOE Green Energy (OSTI)

The competition between the addition of polar, oxygen-containing functional groups (functionalization) and the cleavage of C-C bonds (fragmentation) has a governing influence on the change in volatility of organic species upon atmospheric oxidation, and hence on the loading of tropospheric organic aerosol. However the branching between these two channels is generally poorly constrained for oxidized organics. Here we determine functionalization/fragmentation branching ratios for organics spanning a range of oxidation levels, using the heterogeneous oxidation of squalane (C30H62) as a model system. Squalane particles are exposed to high concentrations of OH in a flow reactor, and measurements of particle mass and elemental ratios enable the determination of absolute elemental composition (number of oxygen, carbon, and hydrogen atoms) of the oxidized particles. At low OH exposures, the oxygen content of the organics increases, indicating that functionalization dominates, whereas at higher exposures the amount of carbon in the particles decreases, indicating the increasing importance of fragmentation processes. Once the organics are moderately oxidized (O/C~;;0.4), fragmentation completely dominates, and the increase in O/C ratio upon further oxidation is due to the loss of carbon rather than the addition of oxygen. These results suggest that fragmentation reactions may be key steps in the atmospheric formation and evolution of oxygenated organic aerosol (OOA).

Kroll, Jesse H.; Smith, Jared D.; Che, Dung L.; Kessler, Sean H.; Worsnop, Douglas R.; Wilson, Kevin R.

2009-03-10T23:59:59.000Z

329

IRON-60 HETEROGENEITY AND INCOMPLETE ISOTOPE MIXING IN THE EARLY SOLAR SYSTEM  

SciTech Connect

Short-lived radionuclides (e.g., {sup 26}Al, {sup 53}Mn, {sup 60}Fe, {sup 182}Hf) are widely used to refine the chronology of the early solar system. They provide chronological information, however, only if they were homogeneously distributed in the source region of the objects under scrutiny at the time of their formation. With the high level of precision now achieved on isotopic measurements, very short time intervals can in principle be resolved and a precise evaluation of the initial homogeneity degree becomes increasingly crucial. High-precision nickel isotope data for differentiated meteorites (angrites, ureilites) and chondritic (CB) components allow us to test the initial distribution of radioactive {sup 60}Fe and stable Ni isotopes. Although these meteorites appear to have formed nearly contemporaneously, they yield variable initial {sup 60}Fe/{sup 56}Fe ratios. Besides, the CB metal nodules and ureilite silicates show nucleosynthetic anomalies. The new data presented here do not confirm the recently inferred late injection of {sup 60}Fe into the protoplanetary disk. Instead, live {sup 60}Fe was present, but heterogeneously distributed, from the start of the solar system, revealing an incomplete mixing of material from various nucleosynthetic sources and restricting the use of the {sup 60}Fe-{sup 60}Ni system as a chronometer.

Quitte, Ghylaine [Universite de Lyon (France); Markowski, Agnes [ETH Zurich, Institute for Isotope Geology and Mineral Resources, Clausiusstrasse 25, CH-8092 Zurich (Switzerland); Latkoczy, Christopher [ETH Zurich, D-CHAB, Laboratory of Inorganic Chemistry, Wolfgang-Pauli Strasse 10, CH-8093 Zurich (Switzerland); Gabriel, Aron; Pack, Andreas, E-mail: Ghylaine.Quitte@ens-lyon.f [Geowissenschaftliches Zentrum, Universitaet Goettingen, Goldschmidtstrasse 1, D-37077 Goettingen (Germany)

2010-09-10T23:59:59.000Z

330

Homogenization for Periodic Heterogeneous Materials with Arbitrary Position-Dependent Material Properties  

SciTech Connect

We present a rigorous homogenization approach for efficient computation of a class of physical problems in a one-dimensional periodic heterogeneous material. This material is represented by a spatially periodic array of unit cells with a length of e. More specifically, the method is applied to the diffusion, heat conduction, and wave propagation problems. Heterogeneous materials can have arbitrary position-dependent continuous or discontinuous materials properties (for example heat conductivity) within the unit cell. The final effective model includes both effective properties at the leading order and high-order contributions due to the microscopic heterogeneity. A dimensionless heterogeneity parameter ß is defined to represent high-order contributions, shown to be in the range of [-1/12, 0], and has a universal expression for all three problems. Both effective properties and heterogeneity parameter ß are independent of e, the microscopic scale of heterogeneity. The homogenized solution describing macroscopic variations can be obtained from the effective model. Solution with sub-unit-cell accuracy can be constructed based on the homogenized solution and its spatial derivatives. The paper represents a general approach to obtain the effective model for arbitrary periodic heterogeneous materials with position-dependent properties.

Xu Zhi-Jie

2012-08-01T23:59:59.000Z

331

Epigenetic and conventional regulation is distributed among activat= allowing tuning of population-level heterogeneity in its expression  

E-Print Network (OSTI)

Epigenetic switches encode their state information either locally, often via covalent modification of DNA or histones, or

Octavio, Leah M.

332

1 2Localisation Strategies of Firms in Wind Energy Technology Development  

E-Print Network (OSTI)

The paper looks at the localisation strategies of multinational companies in wind energy sector in the emerging countries of China and India. It seeks to explain why western multinationals are localising new manufacturing and R&D facilities in emerging economies such as China and India, and how local knowledge and capabilities are being increasingly integrated into global technology and manufacturing networks of multinationals. It explores the reasons behind the localisation of multinational companies that helps them gain strategic access to wind energy technological capabilities in emerging economies. It examines the case of the company Vestas in expanding wind energy cluster of Tianjin in China and Chennai in India. At the strategic level, it explains the importance of the role of local capabilities and skills in the global production networks of multinationals. At the policy level, the discussions leading from the case focuses on the concrete steps necessary to integrate technology and innovation more closely into development of sustainable energy markets in developing countries.

Radikha Perrot; Radhika Perrot

2010-01-01T23:59:59.000Z

333

Drewry: Mideast in firm control of world oil supplies for 1990s  

SciTech Connect

Surging economic growth in the Far East will push up world crude oil demand steadily in the 1990s despite the current economic downturn. It will fall to members of the Organization of Petroleum Exporting Countries to meet that increased demand, given the expected decline in non-OPEC production. And because OPEC members in the Persian Gulf region are best positioned to meet the increase, the balance of power in oil markets will shift even more in favor of the Middle East. Seaborne oil exports from the Middle East will jump almost 30% by 1997 from 1991 levels. There will be a worldwide rise of 16% in the volume of seaborne crude oil trade, with a 29% hike in movements of refined products by tanker. Those are among the findings of a report by Drewry Shipping Consultants Ltd., London. Drewry said, It is expected that 1992 will be a low point in non-OPEC output and that production levels will recover steadily from 1993 onward, although not rapidly enough to match the anticipated rise in demand. Drewry estimates non-OPEC production in 1997 at 37.1 million b/d vs. 38.1 million b/d in 1991. With non-OPEC production falling by 2.6% between 1991 and 1997, OPEC producers will have the scope to increase their output by almost 32% over the same period.

Not Available

1993-02-08T23:59:59.000Z

334

SEISMIC DETERMINATION OF RESERVOIR HETEROGENEITY; APPLICATION TO THE CHARACTERIZATION OF HEAVY OIL RESERVOIRS  

SciTech Connect

The objective of the project is to examine how seismic and geologic data can be used to improve characterization of small-scale heterogeneity and their parameterization in reservoir models. The study is performed at West Coalinga Field in California. We continued our investigation on the nature of seismic reactions from heterogeneous reservoirs. We began testing our algorithm to infer parameters of object-based reservoir models from seismic data. We began integration of seismic and geologic data to determine the deterministic limits of conventional seismic data interpretation. Lastly, we began integration of seismic and geologic heterogeneity using stochastic models conditioned both on wireline and seismic data.

Matthias G. Imhof; James W. Castle

2003-11-01T23:59:59.000Z

335

Abstract--We formulate a three-period model for studying how the exercise of local market power by generation firms  

E-Print Network (OSTI)

generally leads to social losses. Since the existing US electricity transmission network was designed to 1 by generation firms affects the equilibrium investment between the generation and the transmission sectors. Using a 30-bus network example, we compare the transmission investment decisions made by a "proactive

336

The more you spend, the more you get? The effects of R&D and capital expenditures on the patenting activities of biotechnology firms  

Science Conference Proceedings (OSTI)

This paper provides evidence on the mechanisms influencing the patent output of a sample of small and large, entrepreneurial and established biotechnology firms from the input of indirect knowledge acquired from capital expenditures and direct ... Keywords: Biotechnology, Capital expenditure, L25, L65, O34, Patents, Poisson models, R&D

Roberta Piergiovanni; Enrico Santarelli

2013-02-01T23:59:59.000Z

337

Abstract--The implementation of auctions of long-term firm energy call options and forward contracts as part of the  

E-Print Network (OSTI)

for investors, as they enable merchant power plants to sell their electricity for up to 5 years ahead at known) energy production capacity in dry years. For thermal plants, the FEC is given by the available capacity, a thermal plant whose variable operating cost was equal to the rationing cost would have a firm energy

Catholic University of Chile (Universidad Católica de Chile)

338

Avoiding Bad Press: Interpersonal Influence in Relations Between CEOs and Journalists and the Consequences for Press Reporting About Firms and Their Leadership  

Science Conference Proceedings (OSTI)

In this study we consider how and when interpersonal relations between chief executive officers (CEOs) and journalists can influence the content of journalists' reporting about corporate leaders and their firms. Specifically, we draw from the social ... Keywords: corporate governance, journalism, social influence, top management, upper echelons

James D. Westphal; David L. Deephouse

2011-07-01T23:59:59.000Z

339

Traditional communities, multinationals and biodiversity: the example of an innovative partnership between the cosmetic firm Natura and the Brazil nut extractivists of So  

E-Print Network (OSTI)

between the cosmetic firm Natura and the Brazil nut extractivists of São Francisco in the Sustainable Studies Association, Rio de Janeiro, Brazil, June 11-14th , 2009. 1 halshs-00493592,version1-20Jun2010 Author manuscript, published in "LASA 2009 conference, Rion de janeiro : Brazil (2009)" #12;Abstract

Paris-Sud XI, Université de

340

Hybrid Heterogeneous Energy Supply Networks Farinaz Koushanfar and Azalia Mirhoseini  

E-Print Network (OSTI)

-level system realization for a hybrid network of energy supply options [2]. Recently a hybrid battery-supercapacitor supercapacitor and solar energy generation system in optimizing system's efficiency and dynamic response time

Note: This page contains sample records for the topic "firm level heterogeneity" 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

CRUSTAL STRESS HETEROGENEITY IN THE VICINITY OF COSO GEOTHERMAL FIELD, CA |  

Open Energy Info (EERE)

CRUSTAL STRESS HETEROGENEITY IN THE VICINITY OF COSO GEOTHERMAL FIELD, CA CRUSTAL STRESS HETEROGENEITY IN THE VICINITY OF COSO GEOTHERMAL FIELD, CA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: CRUSTAL STRESS HETEROGENEITY IN THE VICINITY OF COSO GEOTHERMAL FIELD, CA Details Activities (1) Areas (1) Regions (0) Abstract: Borehole induced structures in image logs of wells from the Coso Geothermal Field (CGF), CA record variation in the azimuth of principal stress. Image logs of these structures from five wells were analyzed to quantify the stress heterogeneity for three geologically distinct locations: two wells within the CGF (one in an actively produced volume), two on the margin of the CGF and outside the production area, and a control well several tens of kilometers south of the CGF. Average directions of

342

Numerical Investigations on the Influence of Subgrid-Scale Surface Heterogeneity on Evapotranspiration and Cloud Processes  

Science Conference Proceedings (OSTI)

Numerical experiments were performed with a meso-?-scale meteorological model to investigate the influence of subgrid-scale surface heterogeneity on the prediction of evapotranspiration, cloud, and precipitation formation. The results of ...

Nicole Mölders; Armin Raabe

1996-06-01T23:59:59.000Z

343

Improvements to an Empirical Parameterization of Heterogeneous Ice Nucleation and Its Comparison with Observations  

Science Conference Proceedings (OSTI)

A framework for an empirical parameterization (EP) of heterogeneous nucleation of ice crystals by multiple species of aerosol material in clouds was proposed in a 2008 paper by the authors. The present paper reports improvements to specification ...

Vaughan T. J. Phillips; Paul J. Demott; Constantin Andronache; Kerri A. Pratt; Kimberly A. Prather; R. Subramanian; Cynthia Twohy

2013-02-01T23:59:59.000Z

344

Theoretical and experimental studies of heterogeneous chemical processes leading to stratospheric ozone depletion  

E-Print Network (OSTI)

The microscopic chemical mechanisms of heterogeneous reactions involving HC on crystalline ice and nitric acid trihydrate (NAT) are of fundamental interest to physical chemists, because such reactions yield "active" chlorine ...

Mantz, Yves André, 1974-

2002-01-01T23:59:59.000Z

345

Source-Channel Coding of Video Signals for Transmissions in Heterogeneous Network with Collisions  

Science Conference Proceedings (OSTI)

The problem of data transmission in a heterogeneous network environment involves many considerations, among these: the design and selection of coding schemes and transmissions techniques are the most relevant. Recently, the interest in mobile multimedia ...

A. Santana T. Gustavo; S. Adriana Viveros

2000-03-01T23:59:59.000Z

346

Explicit Representation of Subgrid Heterogeneity in a GCM Land Surface Scheme  

Science Conference Proceedings (OSTI)

A land surface scheme that may be run with or without a tiled representation of subgrid heterogeneity and includes an implicit atmospheric coupling scheme is described. Simulated average surface air temperatures and diurnal temperature ranges in ...

R. L. H. Essery; M. J. Best; R. A. Betts; P. M. Cox; C. M. Taylor

2003-06-01T23:59:59.000Z

347

A migration tool to support resource and load sharing in heterogeneous computing environments  

Science Conference Proceedings (OSTI)

Distributed computing systems potentially provide significant advantages and benefits such as enhanced performance, extensibility, reliability, and better resource and load sharing. However, the evolution of hardware and software has unavoidably led ... Keywords: Client-server, Heterogeneous systems, Load balancing, Migrations

P.D Le; B Srinivasan

1997-07-01T23:59:59.000Z

348

Relative Humidity as an Indicator for Cloud Formation over Heterogeneous Land Surfaces  

Science Conference Proceedings (OSTI)

The influence of land surface heterogeneity on potential cloud formation is investigated using relative humidity as an indicator. This is done by performing numerical experiments using a large-eddy simulation model (LES). The land surface in the ...

Chiel C. van Heerwaarden; Jordi Vilà Guerau de Arellano

2008-10-01T23:59:59.000Z

349

An Approach for the Representation of Surface Heterogeneity in Land Surface Models. Part I: Theoretical Framework  

Science Conference Proceedings (OSTI)

In this paper, a theoretical framework is described for the representation of surface heterogeneity within complex biophysical surface schemes for use in climate models. The methodology adopts aspects of the mosaic approach and the statistical–...

Filippo Giorgi

1997-08-01T23:59:59.000Z

350

Study of Mercury Transformation with Chlorinated Species under Homogeneous and Heterogeneous Conditions.  

E-Print Network (OSTI)

??Mercury (Hg) transformation under homogeneous (gas-phase oxidation reactions primarily involving chlorine species in flue gases) and heterogeneous (gas-surface oxidation reactions involving surface enhanced Hg oxidation… (more)

Busireddy, Bhargavi

2009-01-01T23:59:59.000Z

351

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial  

E-Print Network (OSTI)

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial ainsi que des exemples d'applications industrielles. Abstract -- Transformation of Sorbitol to Biofuels and biodiesel production led to first generation biofuels. Nowadays, research is focused on lignocellulosic

Recanati, Catherine

352

A Parameterization of Heterogeneous Land Surfaces for Atmospheric Numerical Models and Its Impact on Regional Meteorology  

Science Conference Proceedings (OSTI)

Natural land surfaces are usually heterogeneous over the resolvable scales considered in atmospheric numerical models. Therefore, model surface parameterizations that assume surface homogeneity may fail to represent the surface forcing ...

R. Avissar; R. A. Pielke

1989-10-01T23:59:59.000Z

353

SLA-based resource provisioning for heterogeneous workloads in a virtualized cloud datacenter  

Science Conference Proceedings (OSTI)

Efficient provisioning of resources is a challenging problem in cloud computing environments due to its dynamic nature and the need for supporting heterogeneous applications with different performance requirements. Currently, cloud datacenter providers ...

Saurabh Kumar Garg; Srinivasa K. Gopalaiyengar; Rajkumar Buyya

2011-10-01T23:59:59.000Z

354

k-Depth Look-Ahead Task Scheduling in Network of Heterogeneous Processors  

Science Conference Proceedings (OSTI)

The objective of the task scheduling is to achieve the minimum execution time of all the tasks with their precedence requirements satisfied. Although several task scheduling heuristics for the heterogeneous environment have been presented in the literature, ...

Namyoon Woo; Heon Young Yeom

2002-01-01T23:59:59.000Z

355

A Large-Eddy Simulation Study of Moist Convection Initiation over Heterogeneous Surface Fluxes  

Science Conference Proceedings (OSTI)

This study uses large-eddy simulations to investigate processes of moist convection initiation (CI) over heterogeneous surface fluxes. Surface energy balance is imposed via a 180° phase lag of the surface moisture flux (relative to the sensible ...

Song-Lak Kang; George H. Bryan

2011-09-01T23:59:59.000Z

356

Software-cooperative power-efficient heterogeneous multi-core for media processing  

Science Conference Proceedings (OSTI)

A heterogeneous multi-core processor (HMCP) architecture, which integrates general purpose processors (CPU) and accelerators (ACC) to achieve high-performance as well as low-power consumption with the support of a parallelizing compiler, was developed. ...

Hiroaki Shikano; Masaki Ito; Kunio Uchiyama; Toshihiko Odaka; Akihiro Hayashi; Takeshi Masuura; Masayoshi Mase; Jun Shirako; Yasutaka Wada; Keiji Kimura; Hironori Kasahara

2008-01-01T23:59:59.000Z

357

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

E-Print Network (OSTI)

from underground tanks and their associated piping occur fre- quently enough to represent a significant and be transported as solutes, or volatilize into the gas phase. It is recognized that soil heterogeneity play, and calculating the mo

Lu, Zhiming

358

Surface Heterogeneity Effects on Regional-Scale Fluxes in Stable Boundary Layers: Surface Temperature Transitions  

Science Conference Proceedings (OSTI)

Large-eddy simulation, with recently developed dynamic subgrid-scale models, is used to study the effect of heterogeneous surface temperature distributions on regional-scale turbulent fluxes in the stable boundary layer (SBL). Simulations are ...

Rob Stoll; Fernando Porté-Agel

2009-02-01T23:59:59.000Z

359

Resolving Cancer Heterogeneity by Single Cell Sequencing (7th Annual SFAF Meeting, 2012)  

Science Conference Proceedings (OSTI)

Xun Xu on "Resolving Cancer Heterogeneity by Single Cell Sequencing" at the 2012 Sequencing, Finishing, Analysis in the Future Meeting held June 5-7, 2012 in Santa Fe, New Mexico.

Xu, Xun [BGI

2012-06-01T23:59:59.000Z

360

Seismic Determination of Reservoir Heterogeneity: Application to the Characterization of Heavy Oil Reservoirs  

Science Conference Proceedings (OSTI)

The objective of the project was to examine how seismic and geologic data could be used to improve characterization of small-scale heterogeneity and their parameterization in reservoir models. The study was performed at West Coalinga Field in California.

Imhof, Matthias G.; Castle, James W.

2003-03-12T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

An Empirical Parameterization of Heterogeneous Ice Nucleation for Multiple Chemical Species of Aerosol  

Science Conference Proceedings (OSTI)

A novel, flexible framework is proposed for parameterizing the heterogeneous nucleation of ice within clouds. It has empirically derived dependencies on the chemistry and surface area of multiple species of ice nucleus (IN) aerosols. Effects from ...

Vaughan T. J. Phillips; Paul J. DeMott; Constantin Andronache

2008-09-01T23:59:59.000Z

362

Variations in organic aerosol optical and hygroscopic properties upon heterogeneous OH oxidation  

E-Print Network (OSTI)

Measurements of the evolution of organic aerosol extinction cross sections (?[subscript ext]) and subsaturated hygroscopicity upon heterogeneous OH oxidation are reported for two model compounds, squalane (a C30 saturated ...

Cappa, Christopher D.

363

Substrate inhibition in the heterogeneous catalyzed aldol condensation: A mechanistic study of supported organocatalysts  

SciTech Connect

In this study, we demonstrate how materials science can be combined with the established methods of organic chemistry to find mechanistic bottlenecks and redesign heterogeneous catalysts for improved performance. By using solid-state NMR, infrared spectroscopy, surface and kinetic analysis, we prove the existence of a substrate inhibition in the aldol condensation catalyzed by heterogeneous amines. We show that modifying the structure of the supported amines according to the proposed mechanism dramatically enhances the activity of the heterogeneous catalyst. We also provide evidence that the reaction benefits significantly from the surface chemistry of the silica support, which plays the role of a co-catalyst, giving activities up to two orders of magnitude larger than those of homogeneous amines. This study confirms that the optimization of a heterogeneous catalyst depends as much on obtaining organic mechanistic information as it does on controlling the structure of the support.

Kandel, Kapil; Althaus, Stacey M.; Peeraphatdit, Chorthip; Kobayashi, Takeshi; Trewyn, Brian G.; Pruski, Marek; Slowing, Igor I.

2012-05-23T23:59:59.000Z

364

Impact of supersonic and subsonic aircraft on ozone: Including heterogeneous chemical reaction mechanisms  

Science Conference Proceedings (OSTI)

Preliminary calculations suggest that heterogeneous reactions are important in calculating the impact on ozone from emissions of trace gases from aircraft fleets. In this study, three heterogeneous chemical processes that occur on background sulfuric acid aerosols are included and their effects on O{sub 3}, NO{sub x}, Cl{sub x}, HCl, N{sub 2}O{sub 5}, ClONO{sub 2} are calculated.

Kinnison, D.E.; Wuebbles, D.J.

1992-07-05T23:59:59.000Z

365

Heterogeneous reaction mechanisms and kinetics relevant to the CVD of semiconductor materials  

DOE Green Energy (OSTI)

This report documents the state of the art in experimental and theoretical techniques for determining reaction mechanisms and chemical kinetics of heterogeneous reactions relevant to the chemical vapor deposition of semiconductor materials. It summarizes the most common ultra-high vacuum experimental techniques that are used and the types of rate information available from each. Several case studies of specific chemical systems relevant to the microelectronics industry are described. Theoretical methods for calculating heterogeneous reaction rate constants are also summarized.

Creighton, J.R.; Coltrin, M.E.

1994-03-01T23:59:59.000Z

366

Complexity analysis of pipeline mapping problems in distributed heterogeneous networks  

Science Conference Proceedings (OSTI)

Largescale scientific applications require using various system resources to execute complex computing pipelines in distributed networks to support collaborative research. System resources are typically shared in the Internet or over dedicated connections based on their location, availability, capability, and capacity. Optimizing the network performance of computing pipelines in such distributed environments is critical to the success of these applications. We consider two types of largescale distributed applications: (1) interactive applications where a single dataset is sequentially processed along a pipeline; and (2) streaming applications where a series of datasets continuously flow through a pipeline. The computing pipelines of these applications consist of a number of modules executed in a linear order in network environments with heterogeneous resources under different constraints. Our goal is to find an efficient mapping scheme that allocates the modules of a pipeline to network nodes for minimum endtoend delay or maximum frame rate. We formulate the pipeline mappings in distributed environments as optimization problems and categorize them into six classes with different optimization goals and mapping constraints: (1) Minimum Endtoend Delay with No Node Reuse (MEDNNR), (2) Minimum Endtoend Delay with Contiguous Node Reuse (MEDCNR), (3) Minimum Endtoend Delay with Arbitrary Node Reuse (MEDANR), (4) Maximum Frame Rate with No Node Reuse or Share (MFRNNRS), (5) Maximum Frame Rate with Contiguous Node Reuse and Share (MFRCNRS), and (6) Maximum Frame Rate with Arbitrary Node Reuse and Share (MFRANRS). Here, 'contiguous node reuse' means that multiple contiguous modules along the pipeline may run on the same node and 'arbitrary node reuse' imposes no restriction on node reuse. Note that in interactive applications, a node can be reused but its resource is not shared. We prove that MEDANR is polynomially solvable and the rest are NP-complete. MEDANR, where either contiguous or noncontiguous modules in the pipeline can be mapped onto the same node, is essentially the Maximum n-hop Shortest Path problem, and can be solved using a dynamic programming method. In MEDNNR and MFRNNRS, any network node can be used only once, which requires selecting the same number of nodes for onetoone onto mapping. We show its NP-completeness by reducing from the Hamiltonian Path problem. Node reuse is allowed in MEDCNR, MFRCNRS and MFRANRS, which are similar to the Maximum n-hop Shortest Path problem that considers resource sharing. We prove their NP-completeness by reducing from the Disjoint-Connecting-Path Problem and Widest path with the Linear Capacity Constraints problem, respectively.

Lin, Ying [University of Tennessee, Knoxville (UTK); Wu, Qishi [ORNL; Zhu, Mengxia [ORNL; Rao, Nageswara S [ORNL

2009-04-01T23:59:59.000Z

367

IMPROVING CO2 EFFICIENCY FOR RECOVERING OIL IN HETEROGENEOUS RESERVOIRS  

Science Conference Proceedings (OSTI)

The second annual report of ''Improving CO{sub 2} Efficiency for Recovery Oil in Heterogeneous Reservoirs'' presents results of laboratory studies with related analytical models for improved oil recovery. All studies have been undertaken with the intention to optimize utilization and extend the practice of CO{sub 2} flooding to a wider range of reservoirs. Many items presented in this report are applicable to other interest areas: e.g. gas injection and production, greenhouse gas sequestration, chemical flooding, reservoir damage, etc. Major areas of studies include reduction of CO{sub 2} mobility to improve conformance, determining and understanding injectivity changes in particular injectivity loses, and modeling process mechanisms determined in the first two areas. Interfacial tension (IFT) between a high-pressure, high-temperature CO{sub 2} and brine/surfactant and foam stability are used to assess and screen surfactant systems. In this work the effects of salinity, pressure, temperature, surfactant concentration, and the presence of oil on IFT and CO{sub 2} foam stability were determined on the surfactant (CD1045{trademark}). Temperature, pressure, and surfactant concentration effected both IFT and foam stability while oil destabilized the foam, but did not destroy it. Calcium lignosulfonate (CLS) can be used as a sacrificial and an enhancing agent. This work indicates that on Berea sandstone CLS concentration, brine salinity, and temperature are dominant affects on both adsorption and desorption and that adsorption is not totally reversible. Additionally, CLS adsorption was tested on five minerals common to oil reservoirs; it was found that CLS concentration, salinity, temperature, and mineral type had significant effects on adsorption. The adsorption density from most to least was: bentonite > kaolinite > dolomite > calcite > silica. This work demonstrates the extent of dissolution and precipitation from co-injection of CO{sub 2} and brine in limestone core. Metal tracers in the brine were used as markers to identify precipitation location and extent. This indicated possible causes of permanent permeability changes in the core and thus in a reservoir. Core segment porosity, permeability, chemical and back-scattered electron imaging, and chemical titrations were all used for qualitative and quantitative determination of compositional and injectivity changes. Also, injectivity effects of high flow rate near a wellbore and stress changes were shown on five different cores (two Berea sandstones, two Indiana limestones, and one Dakota sandstone).

Reid B. Grigg

2003-10-31T23:59:59.000Z

368

Theoretical Studies in Heterogenous Catalysis: Towards a Rational Design of Novel Catalysts for Hydrodesulfurization and Hydrogen Production  

DOE Green Energy (OSTI)

Traditionally, knowledge in heterogeneous catalysis has come through empirical research. Nowadays, there is a clear interest to change this since millions of dollars in products are generated every year in the chemical and petrochemical industries through catalytic processes. To obtain a fundamental knowledge of the factors that determine the activity of heterogeneous catalysts is a challenge for modern science since many of these systems are very complex in nature. In principle, when a molecule adsorbs on the surface of a heterogeneous catalyst, it can interact with a large number of bonding sites. It is known that the chemical properties of these bonding sites depend strongly on the chemical environment around them. Thus, there can be big variations in chemical reactivity when going from one region to another in the surface of a heterogeneous catalyst. A main objective is to understand how the structural and electronic properties of a surface affect the energetics for adsorption processes and the paths for dissociation and chemical reactions. In recent years, advances in instrumentation and experimental procedures have allowed a large series of detailed works on the surface chemistry of heterogeneous catalysts. In many cases, these experimental studies have shown interesting and unique phenomena. Theory is needed to unravel the basic interactions behind these phenomena and to provide a general framework for the interpretation of experimental results. Ideally, theoretical calculations based on density-functional theory have evolved to the point that one should be able to predict patterns in the activity of catalytic surfaces. As in the case of experimental techniques, no single theoretical approach is able to address the large diversity of phenomena occurring on a catalyst. Catalytic surfaces are usually modeled using either a finite cluster or a two-dimensionally periodic slab. Many articles have been published comparing the results of these two approaches. An important advantage of the cluster approach is that one can use the whole spectrum of quantum-chemical methods developed for small molecules with relatively minor modifications. On the other hand, the numerical effort involved in cluster calculations increases rather quickly with the size of the cluster. This problem does not exist when using slab models. Due to the explicit incorporation of the periodicity of the crystal lattice through the Bloch theorem, the actual dimension of a slab calculation depends only on the size of the unit cell. In practical terms, the slab approach is mainly useful for investigating the behavior of adsorbates at medium and high coverages. Very large unit cells are required at the limit of low to zero coverage, or when examining the properties and chemical behavior of isolated defect sites in a surface. In these cases, from a computational viewpoint, the cluster approach can be much more cost effective than the slab approach. Slab and cluster calculations can be performed at different levels of sophistication: semi-empirical methods, simple ab initio Hartree-Fock, ab initio post-Hartree-Fock (CI, MP2, etc), and density functional theory. Density-functional (DF) based calculations frequently give adsorption geometries with a high degree of accuracy and predict reliable trends for the energetics of adsorption reactions. This article provides a review of recent theoretical studies that deal with the behavior of novel catalysts used for hydrodesulfurization (HDS) reactions and the production of hydrogen (i.e. catalytic processes employed in the generation of clean fuels). These studies involve a strong coupling of theory and experiment. A significant fraction of the review is focused on the importance of size-effects and correlations between the electronic and chemical properties of catalytic materials. The article begins with a discussion of results for the desulfurization of thiophene on metal carbides and phosphides, systems which have the potential to become the next generation of industrial HDS catalysts. Then, systematic studies con

Rodriguez,J.A.; Liu, P.

2008-10-01T23:59:59.000Z

369

HYBRID HETEROGENEOUS CATALYSTS FOR HYDROGENATION OF CARBON DIOXIDE  

DOE Green Energy (OSTI)

HYBRID HETEROGENEOUS CATALYSTS FOR HYDROGENATION OF CARBON DIOXIDE Lucia M. Petkovic, Harry W. Rollins, Daniel M. Ginosar, and Kyle C. Burch Idaho National Laboratory P.O. Box 1625 Idaho Falls, ID 83415-2208 Introduction Anthropogenic emissions of carbon dioxide, a gas often associated with global warming, have increased considerably since the beginning of the industrial age.1 In the U.S., stationary CO2 sources, such as electricity generation plants, produce about one-third of the anthropogenic CO2 generation. Reports2 indicate that the power required to recover 90% of the CO2 from an integrated coal-fired power-plant is about 10% of the power-plant capacity. This energy requirement can be reduced to less than 1% if the recovered CO2 is applied to the production of synthetic fuels. However, the lack of efficient catalysts along with the costs of energy and hydrogen has prevented the development of technologies for direct hydrogenation of CO2.3 Although the cost of hydrogen for hydrogenating CO2 is not economically attractive at present, the future production of hydrogen by nuclear power sources could completely change this scenario.2 Still, an efficient catalyst will be essential for commercial application of those processes. The objective of the work presented here was the development of hybrid catalysts for one-step carbon dioxide hydrogenation to liquid fuels. The hybrid catalysts, which were prepared by two novel techniques, included a copper/zinc oxide catalytic function distributed within an acidic zeolitic matrix. Results of catalyst activity and selectivity studies at atmospheric pressure are presented in this contribution. Experimental Catalysts were prepared by two novel techniques and under several different conditions to produce copper/zinc oxide/zeolite materials. Once synthesized, samples were pelletized and the fraction between 40-60 mesh was utilized for the experiments. Two hundred milligrams of catalyst were loaded in a U-tube stainless steel reactor and a flow of 100 cm3/min of a 10:90 H2:Ar mixture was passed through the catalyst bed while the temperature was increased from room temperature to 513 K at 1.8 K/min and held at 513 K for 15 h. A reactant gas mixture composed by 10 cm3/min of CO2 and 30 cm3/min of H2 was then passed through the catalyst bed and the reaction products monitored by on-line gas chromatographic analyses using an SRI Multiple Gas Analyzer #2 equipped with 3 columns (MoleSieve 13X, Hayesep-D, and MXT-1) and 3 detectors (TCD, FID, and FID-methanizer). This GC system allowed for quantification of inert gases, CO, CO2, methanol, dimethylether, higher alcohols, water, and hydrocarbons up to C20. One hundred milligrams of a commercial syngas-to-methanol catalyst along with the same amount of a commercial zeolite catalyst was utilized under the same reaction conditions for comparison purposes. These catalysts were utilized either in two-layers (Com1) or mixed together (Com2). Results and Discussion Under the conditions applied in this study, the main reaction products were CO, CH3OH, CH3OCH3, and H2O. Methanol and dimethylether production rates and selectivities with respect to CO formation are presented in Figures 1 and 2, respectively. Although the activity of the synthesized catalysts did not surpass the commercial catalysts, the selectivity to oxygenates with respect to CO on most of the synthesized catalysts were better than on the commercial catalysts. For example, cat

Licia M. Petkovic; Harry W. Rollins; Daniel M. Ginosar; Kyle C. Burch

2006-09-01T23:59:59.000Z

370

IMPROVING CO2 EFFICIENCY FOR RECOVERING OIL IN HETEROGENEOUS RESERVOIRS  

SciTech Connect

This document is the First Annual Report for the U.S. Department of Energy under contract No., a three-year contract entitled: ''Improving CO{sub 2} Efficiency for Recovering Oil in Heterogeneous Reservoirs.'' The research improved our knowledge and understanding of CO{sub 2} flooding and includes work in the areas of injectivity and mobility control. The bulk of this work has been performed by the New Mexico Petroleum Recovery Research Center, a research division of New Mexico Institute of Mining and Technology. This report covers the reporting period of September 28, 2001 and September 27, 2002. Injectivity continues to be a concern to the industry. During this period we have contacted most of the CO{sub 2} operators in the Permian Basin and talked again about their problems in this area. This report has a summary of what we found. It is a given that carbonate mineral dissolution and deposition occur in a formation in geologic time and are expected to some degree in carbon dioxide (CO{sub 2}) floods. Water-alternating-gas (WAG) core flood experiments conducted on limestone and dolomite core plugs confirm that these processes can occur over relatively short time periods (hours to days) and in close proximity to each other. Results from laboratory CO{sub 2}-brine flow experiments performed in rock core were used to calibrate a reactive transport simulator. The calibrated model is being used to estimate in situ effects of a range of possible sequestration options in depleted oil/gas reservoirs. The code applied in this study is a combination of the well known TOUGH2 simulator, for coupled groundwater/brine and heat flow, with the chemistry code TRANS for chemically reactive transport. Variability in response among rock types suggests that CO{sub 2} injection will induce ranges of transient and spatially dependent changes in intrinsic rock permeability and porosity. Determining the effect of matrix changes on CO{sub 2} mobility is crucial in evaluating the efficacy and potential environmental implications of storing CO{sub 2} in the subsurface. Chemical cost reductions are identified that are derived from the synergistic effects of cosurfactant systems using a good foaming agent and a less expensive poor foaming agent. The required good foaming agent is reduced by at least 75%. Also the effect on injectivity is reduced by as much as 50% using the cosurfactant system, compared to a previously used surfactant system. Mobility control of injected CO{sub 2} for improved oil recovery can be achieved with significant reduction in the chemical cost of SAG, improved injectivity of SAG, and improved economics of CO{sub 2} injection project when compared to reported systems. Our past work has identified a number of mobility control agents to use for CO{sub 2}-foam flooding. In particular the combination of the good foaming agent CD 1045 and a sacrificial agent and cosurfactant lignosulfonate. This work scrutinizes the methods that we are using to determine the efficiency of the sacrificial agents and cosurfactant systems. These have required concentration determinations and reusing core samples. Here, we report some of the problems that have been found and some interesting effects that must be considered.

Reid B. Grigg; Robert K. Svec

2002-12-20T23:59:59.000Z

371

IMPROVING CO2 EFFICIENCY FOR RECOVERING OIL IN HETEROGENEOUS RESERVOIRS  

SciTech Connect

The third annual report of ''Improving CO{sub 2} Efficiency for Recovery Oil in Heterogeneous Reservoirs'' presents results of laboratory studies with related analytical models for improved oil recovery. All studies were designed to optimize utilization and extend the practice of CO{sub 2} flooding to a wider range of reservoirs. Chapter 1 describes the behavior at low concentrations of the surfactant Chaser International CD1045{trademark} (CD) versus different salinity, pressure and temperature. Results of studies on the effects of pH and polymer (hydrolyzed polyacrylamide?HPAM) and CO{sub 2} foam stability after adsorption in the core are also reported. Calcium lignosulfonate (CLS) transport mechanisms through sandstone, description of the adsorption of CD and CD/CLS onto three porous media (sandstone, limestone and dolomite) and five minerals, and the effect of adsorption on foam stability are also reported. In Chapter 2, the adsorption kinetics of CLS in porous Berea sandstone and non-porous minerals are compared by monitoring adsorption density change with time. Results show that adsorption requires a much longer time for the porous versus non-porous medium. CLS adsorption onto sandstone can be divided into three regions: adsorption controlled by dispersion, adsorption controlled by diffusion and adsorption equilibrium. NaI tracer used to characterize the sandstone had similar trends to earlier results for the CLS desorption process, suggesting a dual porosity model to simulate flow through Berea sandstone. The kinetics and equilibrium test for CD adsorption onto five non-porous minerals and three porous media are reported in Chapter 3. CD adsorption and desorption onto non-porous minerals can be established in less than one hour with adsorption densities ranging from 0.4 to 1.2 mg of CD per g of mineral in decreasing order of montmorillonite, dolomite, kaolinite, silica and calcite. The surfactant adsorption onto three porous media takes much longer than one hour, with Berea sandstone requiring the longest time. In Chapter 4, comparisons of static adsorption of CLS, CD, and CLS/CD mixtures onto five pure minerals showed that the presence of CLS decreased the adsorption of CD onto the five minerals by 20 to 70%. Dynamic CLS/CD mixture adsorption tests onto Berea sandstone and Indian limestone cores showed that competitive adsorption between CD and CLS generally takes several days to reach equilibrium. Foam stability and interfacial tension tests on both injected and effluent samples were performed which showed that both foam stability and IFT decreased due to adsorption. Also it appears that there is a chromatographic effect on the surfactants in flow through porous media. Progress was realized in developing general equations for stress sensitivity on non-Darcy parameters (permeability and non-Darcy coefficient), and the multiphase flow induced by a high flow rate was confirmed as a mechanism for injectivity loss in CO{sub 2} flooding. In Chapter 5, a general equation is defined based on 60 general equations of permeability stress sensitivity and non-Darcy coefficient stress sensitivity and definitions of nominal permeability, nominal non-Darcy coefficient, permeability stress sensitivity, and non-Darcy coefficient stress sensitivity. The equations of stress sensitivity are independent of pressure, temperature, and rock properties and existing empirical correlations of the nominal permeability and nominal non-Darcy coefficient can be used when laboratory data are not available. This provides a tool to quantify the change of permeability and non-Darcy coefficient due to change of effective stress resulted from reservoir injection and/or production.

Reid B. Grigg; Robert K. Svec; Zhengwen Zeng; Baojun Bai; Yi Liu

2004-09-27T23:59:59.000Z

372

The effect of reservoir heterogeneity on gas production from hydrate accumulations in the permafrost  

SciTech Connect

The quantity of hydrocarbon gases trapped in natural hydrate accumulations is enormous, leading to significant interest in the evaluation of their potential as an energy source. Large volumes of gas can be readily produced at high rates for long times from methane hydrate accumulations in the permafrost by means of depressurization-induced dissociation combined with conventional technologies and horizontal or vertical well configurations. Initial studies on the possibility of natural gas production from permafrost hydrates assumed homogeneity in intrinsic reservoir properties and in the initial condition of the hydrate-bearing layers (either due to the coarseness of the model or due to simplifications in the definition of the system). These results showed great promise for gas recovery from Class 1, 2, and 3 systems in the permafrost. This work examines the consequences of inevitable heterogeneity in intrinsic properties, such as in the porosity of the hydrate-bearing formation, or heterogeneity in the initial state of hydrate saturation. Heterogeneous configurations are generated through multiple methods: (1) through defining heterogeneous layers via existing well-log data, (2) through randomized initialization of reservoir properties and initial conditions, and (3) through the use of geostatistical methods to create heterogeneous fields that extrapolate from the limited data available from cores and well-log data. These extrapolations use available information and established geophysical methods to capture a range of deposit properties and hydrate configurations. The results show that some forms of heterogeneity, such as horizontal stratification, can assist in production of hydrate-derived gas. However, more heterogeneous structures can lead to complex physical behavior within the deposit and near the wellbore that may obstruct the flow of fluids to the well, necessitating revised production strategies. The need for fine discretization is crucial in all cases to capture dynamic behavior during production.

Reagan, M. T.; Kowalsky, M B.; Moridis, G. J.; Silpngarmlert, S.

2010-05-01T23:59:59.000Z

373

Company Level Imports Archives  

U.S. Energy Information Administration (EIA) Indexed Site

Company Level Imports Company Level Imports Archives 2013 Imports by Month January XLS February XLS March XLS April XLS May XLS June XLS July XLS August XLS September XLS...

374

Liquid level detector  

DOE Patents (OSTI)

A liquid level detector for low pressure boilers. A boiler tank, from which apor, such as steam, normally exits via a main vent, is provided with a vertical side tube connected to the tank at the desired low liquid level. When the liquid level falls to the level of the side tube vapor escapes therethrough causing heating of a temperature sensitive device located in the side tube, which, for example, may activate a liquid supply means for adding liquid to the boiler tank. High liquid level in the boiler tank blocks entry of vapor into the side tube, allowing the temperature sensitive device to cool, for example, to ambient temperature.

Grasso, Albert P. (Vernon, CT)

1986-01-01T23:59:59.000Z

375

Liquid level detector  

DOE Patents (OSTI)

A liquid level detector for low pressure boilers. A boiler tank, from which vapor, such as steam, normally exits via a main vent, is provided with a vertical side tube connected to the tank at the desired low liquid level. When the liquid level falls to the level of the side tube vapor escapes therethrough causing heating of a temperature sensitive device located in the side tube, which, for example, may activate a liquid supply means for adding liquid to the boiler tank. High liquid level in the boiler tank blocks entry of vapor into the side tube, allowing the temperature sensitive device to cool, for example, to ambient temperature.

Grasso, A.P.

1984-02-21T23:59:59.000Z

376

Homogenization and Upscaling for Diffusion, Heat Conduction, and Wave Propagation in Heterogeneous Materials  

SciTech Connect

We present a general homogenization method for diffusion, heat conduction, and wave propagation in a periodic heterogeneous material with piecewise constants. The method is relevant to the frequently encountered upscaling issues for heterogeneous materials. The dispersion relation for each problem is first expressed in the general form where the frequency w (or wavenumber k) is expanded in terms of the wavenumber k (or frequency w). A general homogenization model can be directly obtained with any given dispersion relation. Next step we study the unit cell of the heterogeneous material and derive the exact dispersion relation. The final homogenized equations include both leading order terms (effective properties) and high order contributions that represent the effect of the microscopic heterogeneity on the macroscopic behavior. That effect can be lumped into a single dimensionless heterogeneity parameter, which is bounded between -1/12 less than or equal to less than or equal to 0 and has a universal expression for all three problems. Numerical examples validate the proposed method and demonstrate a significant computational saving.

Zhi-Jie Xu

2012-03-01T23:59:59.000Z

377

Development of a farm-firm modelling system for evaluation of herbaceous energy crops. Final project report  

DOE Green Energy (OSTI)

A complete analysis is performed to simulate biomass production incorporated into a realistic whole farm situation, including or replacing a typical crop mix. Representative farms are constructed to accommodate such simulation. Four management systems are simulated for each firm, with each simulation depicting a different crop mix and/or use of different farming technologies and production methods. The first simulation was a base farm plan in which the operator would maintain the historical crop mix for the area, participate in all price support programs, and not participate in either a conservative reserve or a biomass production program. In the second simulation, the operator would again maintain the historical crop mix, would not participate in a conservation reserve or biomass production program, and would be ineligible to participate in any price support system. The third simulation introduced the Conservation Reserve Program (CRP) and included participation in all price support programs. The fourth simulation introduced a biomass crop production enterprise (switchgrass) as an alternative to enrolling highly erodible cropland in the CRP and allowed participation in price support programs. Simulations were made for three farms, two in West Tennessee and on in South Georgia. Results indicate that erosion is likely to be reduced more by the diversion of cropland to permanent vegetative cover on farms similar to the more highly erodible West Tennessee farms than on the less erodible Tift County, Georgia farm. Equivalent reductions in erosion rates result from entering highly erodible cropland in the CRP and from production of switchgrass as a biomass energy crop. Both switchgrass and CRP farm plans result in decreased net returns from the base plan, although the biomass farm plans are, in general, more profitable than the CRP plans.

English, B.C.; Alexander, R.R.; Loewen, K.H.; Coady, S.A.; Cole, G.V.; Goodman, W.R. [Tennessee Univ., Knoxville, TN (United States). Dept. of Agricultural Economics and Rural Sociology

1992-01-01T23:59:59.000Z

378

Effects of capillary heterogeneity on vapor-liquid counterflow in porous media  

DOE Green Energy (OSTI)

Based on a continuum description, the effect of capillary heterogeneity, induced by variation in permeability, on the steady state, countercurrent, vapor-liquid flow in porous media is analyzed. It is shown that the heterogeneity acts as a body force, that may enhance or diminish gravity effects on heat pipes. Selection rules that determine the steady states reached in homogeneous, gravity-driven heat pipes are also formulated. It is shown that the ``infinite`` two-phase zone may terminate by a substantial change in the permeability somewhere in the medium. The two possible sequences, liquid - liquid dominated - dry, or liquid - vapor dominated - dry find applications in geothermal systems. Finally, it is shown that although weak heterogeneity affects only gravity controlled flows, stronger variations in permeability can give rise to significant capillary effects.

Stubos, A.K.; Satik, C.; Yortsos, Y.C.

1992-06-01T23:59:59.000Z

379

Effects of capillary heterogeneity on vapor-liquid counterflow in porous media  

DOE Green Energy (OSTI)

Based on a continuum description, the effect of capillary heterogeneity, induced by variation in permeability, on the steady state, countercurrent, vapor-liquid flow in porous media is analyzed. It is shown that the heterogeneity acts as a body force, that may enhance or diminish gravity effects on heat pipes. Selection rules that determine the steady states reached in homogeneous, gravity-driven heat pipes are also formulated. It is shown that the infinite'' two-phase zone may terminate by a substantial change in the permeability somewhere in the medium. The two possible sequences, liquid - liquid dominated - dry, or liquid - vapor dominated - dry find applications in geothermal systems. Finally, it is shown that although weak heterogeneity affects only gravity controlled flows, stronger variations in permeability can give rise to significant capillary effects.

Stubos, A.K.; Satik, C.; Yortsos, Y.C.

1992-06-01T23:59:59.000Z

380

Energy efficient prediction clustering algorithm for multilevel heterogeneous wireless sensor networks  

E-Print Network (OSTI)

In designing wireless sensor networks, it is important to reduce energy dissipation and prolong network lifetime. In this paper, a new model with energy and monitored objects heterogeneity is proposed for heterogeneous wireless sensor networks. We put forward an energy-efficient prediction clustering algorithm, which is adaptive to the heterogeneous model. This algorithm enables the nodes to select the cluster head according to factors such as energy and communication cost, thus the nodes with higher residual energy have higher probability to become a cluster head than those with lower residual energy, so that the network energy can be dissipated uniformly. In order to reduce energy consumption when broadcasting in clustering phase and prolong network lifetime, an energy consumption prediction model is established for regular data acquisition nodes. Simulation results show that compared with current clustering algorithms, this algorithm can achieve longer sensor network lifetime, higher energy efficiency and ...

Liu, Tang; Yang, Jin; Wang, Chunli

2011-01-01T23:59:59.000Z

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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

A dynamic fuel cycle analysis for a heterogeneous thorium-DUPIC recycle in CANDU reactors  

SciTech Connect

A heterogeneous thorium fuel recycle scenario in a Canada deuterium uranium (CANDU) reactor has been analyzed by the dynamic analysis method. The thorium recycling is performed through a dry process which has a strong proliferation resistance. In the fuel cycle model, the existing nuclear power plant construction plan was considered up to 2016, while the nuclear demand growth rate from the year 2016 was assumed to be 0%. In this analysis, the spent fuel inventory as well as the amount of plutonium, minor actinides, and fission products of a multiple thorium recycling fuel cycle were estimated and compared to those of the once-through fuel cycle. The analysis results have shown that the heterogeneous thorium fuel cycle can be constructed through the dry process technology. It is also shown that the heterogeneous thorium fuel cycle can reduce the spent fuel inventory and save on the natural uranium resources when compared with the once-through cycle. (authors)

Jeong, C. J.; Park, C. J.; Choi, H. [Korea Atomic Energy Research Inst., P.O. Box 150, Yuseong, Daejeon, 305-600 (Korea, Republic of)

2006-07-01T23:59:59.000Z

382

Windy Gap Firming Project  

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

action is to relocate approximately 3.8 miles of the existing Estes to Lyons 115-kilovolt transmission line, if the Chimney Hollow Reservoir alternative is constructed. The line...

383

FIRM Program Booklet[5  

Science Conference Proceedings (OSTI)

... the time, expense and consumption of animals seen ... as the low-? friction, load bearing tissue ... such as backscattered energy, frequency dependence ...

2012-10-03T23:59:59.000Z

384

The Direct Observation of Secondary Radical Chain Chemistry in the Heterogeneous Reaction of Chlorine Atoms with Submicron Squalane Droplets  

E-Print Network (OSTI)

the Heterogeneous Reaction of Chlorine Atoms with Submicronflow tube reactor in which chlorine atoms are produced byindustrialized areas. 3 Chlorine atoms can be formed by the

Liu, Chen-Lin

2012-01-01T23:59:59.000Z

385

Level: National Data;  

U.S. Energy Information Administration (EIA) Indexed Site

.5 First Use of Energy for All Purposes (Fuel and Nonfuel), 2006; Level: National Data; Row: Energy Sources and Shipments, including Further Classification of 'Other' Energy...

386

Liquid level detection  

Science Conference Proceedings (OSTI)

This paper discusses a method. It is for detecting presence of a liquid level at a first predetermined point along the depth of a borehole.

Fryer, C.D.; Stie, K.E.; Wedel, M.W.; Stamper, K.R.

1990-11-27T23:59:59.000Z

387

" Level: National Data;" " ...  

U.S. Energy Information Administration (EIA) Indexed Site

3 Number of Establishments with Capability to Switch Natural Gas to Alternative Energy Sources, 2002;" " Level: National Data;" " Row: NAICS Codes;" " Column: Energy Sources;" "...

388

" Level: National Data;" " ...  

U.S. Energy Information Administration (EIA) Indexed Site

7 Number of Establishments with Capability to Switch Electricity to Alternative Energy Sources, 2002; " " Level: National Data;" " Row: NAICS Codes;" " Column: Energy Sources;" "...

389

SystemC-AMS high-level modeling of linear analog blocks with power consumption information  

Science Conference Proceedings (OSTI)

SystemC-AMS allows the modeling of complex heterogeneous systems at different levels of abstraction using different modeling styles, called Models of Computation (MoC). This work presents an approach for including energy consumption information in high-level ... Keywords: passive fourth-order low pass filter, systemC-AMS high-level modeling, linear analog blocks, power consumption information, energy consumption information, linear electrical circuits, systemC-AMS linear signal flow MoC, SPICE netlist, state space representation extraction, LSF description level

L. Bousquet; F. Cenni; E. Simeu

2011-03-01T23:59:59.000Z

390

ADVANCED HETEROGENEOUS REBURN FUEL FROM COAL AND HOG MANURE  

DOE Green Energy (OSTI)

This study was performed to investigate whether the nitrogen content inherent in hog manure and alkali used as a catalyst during processing could be combined with coal to produce a reburn fuel that would result in advanced reburning NO{sub x} control without the addition of either alkali or ammonia/urea. Fresh hog manure was processed in a cold-charge, 1-gal, batch autoclave system at 275 C under a reducing atmosphere in the presence of an alkali catalyst. Instead of the expected organic liquid, the resulting product was a waxy solid material. The waxy nature of the material made size reduction and feeding difficult as the material agglomerated and tended to melt, plugging the feeder. The material was eventually broken up and sized manually and a water-cooled feeder was designed and fabricated. Two reburn tests were performed in a pilot-scale combustor. The first test evaluated a reburn fuel mixture comprising lignite and air-dried, raw hog manure. The second test evaluated a reburn fuel mixture made of lignite and the processed hog manure. Neither reburn fuel reduced NO{sub x} levels in the combustor flue gas. Increased slagging and ash deposition were observed during both reburn tests. The material-handling and ash-fouling issues encountered during this study indicate that the use of waste-based reburn fuels could pose practical difficulties in implementation on a larger scale.

Melanie D. Jensen; Ronald C. Timpe; Jason D. Laumb

2003-09-01T23:59:59.000Z

391

Numerical modeling of two-phase flow in heterogeneous permeable media with different capillarity pressures  

E-Print Network (OSTI)

, CA, USA b Yale University, New Haven, CT, USA Received 8 February 2007; received in revised form 15 in application to flow in per- meable media with capillary heterogeneity. In this work, we propose a new gradient is in terms of the total mobility which is smoother than the wetting mobility. We combine the MFE

Firoozabadi, Abbas

392

Grids and Clouds: Making Workflow Applications Work in Heterogeneous Distributed Environments  

Science Conference Proceedings (OSTI)

Scientific workflows are frequently being used to model complex phenomena, to analyze instrumental data, to tie together information from distributed sources, and to pursue other scientific endeavors. Out of necessity, these complex applications need ... Keywords: applications, cloud computing, grid computing, heterogeneous distributed environments, scientific workflows

Ewa Deelman

2010-08-01T23:59:59.000Z

393

On the Derivation of Material Thermal Properties Representative of Heterogeneous Urban Neighborhoods  

Science Conference Proceedings (OSTI)

An important question arises when modeling a heterogeneous landscape (e.g., an urbanized area) with a mesoscale atmospheric model. The surface within a grid cell of the model (which has a typical dimension of one or more kilometers) can be ...

F. Salamanca; E. S. Krayenhoff; A. Martilli

2009-08-01T23:59:59.000Z

394

A smart campus prototype for demonstrating the semantic integration of heterogeneous data  

Science Conference Proceedings (OSTI)

This paper describes the implementation of a Smart Campus application prototype that integrates heterogeneous data using semantic technologies. The prototype is based on a layered semantic architecture that facilitates semantic data access and integration ... Keywords: axioms, prototype, queries, rules, semantic integration

Aidan Boran; Ivan Bedini; Christopher J. Matheus; Peter F. Patel-Schneider; John Keeney

2011-08-01T23:59:59.000Z

395

Performance and numerical accuracy evaluation of heterogeneous multicore systems for Krylov orthogonal basis computation  

Science Conference Proceedings (OSTI)

We study the numerical behavior of heterogeneous systems such as CPU with GPU or IBM Cell processors for some orthogonalization processes. We focus on the influence of the different floating arithmetic handling of these accelerators with Gram-Schmidt ... Keywords: numerical algorithms for CS&E, parallel and distributed computing, performance analysis

Jérôme Dubois; Christophe Calvin; Serge Petiton

2010-06-01T23:59:59.000Z

396

Using semivariogram indices to analyse heterogeneity in spatial patterns in remotely sensed images  

Science Conference Proceedings (OSTI)

The benchmark problem proposed in this paper is to identify regions in aerial or satellite images with geometric patterns and describe the geometric properties of the constituent elements of the pattern and their spatial distribution. This is a relevant ... Keywords: Image processing, Object-based analysis, Pattern heterogeneity, Semivariogram

A. Balaguer-Beser; L. A. Ruiz; T. Hermosilla; J. A. Recio

2013-01-01T23:59:59.000Z

397

Average crack front velocity during subcritical fracture propagation in a heterogeneous medium  

E-Print Network (OSTI)

the free energy, and thus the energy barrier, via numerous competing mech- anisms like stress corrosion speed of crack growth with increasing G; a weak stress- sensitive regime II follows where transportAverage crack front velocity during subcritical fracture propagation in a heterogeneous medium

Ampuero, Jean Paul

398

TEM and EDS investigation of heterogeneous interfaces in cofired multilayer ceramic capacitors  

E-Print Network (OSTI)

With the rapid development of electrical industry, monolithic ceramic devices with smaller size and lami- natedTEM and EDS investigation of heterogeneous interfaces in cofired multilayer ceramic capacitors Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China b Department

Chen, Haydn H.

399

CriStore: dynamic storage system for heterogeneous devices in off-site ubiquitous communities  

Science Conference Proceedings (OSTI)

Most researches for ubiquitous services have been interested in constructing intelligent environments in physical spaces such as conference hall, meeting room, home, and campus. In these spaces people are able to share data easily. However, as cooperative ... Keywords: dynamic storage system, flexible overlay topology, heterogeneity, off-site ubiquitous community, self-organizing

Hyunbin Lee; YongJoo Song; Kyungbaek Kim; Donggook Kim; Daeyeon Park

2007-03-01T23:59:59.000Z

400

The City of Albuquerque: from heterogeneous data sources to public service visionary  

E-Print Network (OSTI)

, such as public safety and campaign reporting data, to its 750,000 residents through a BI extranet. SinceCase Study The City of Albuquerque: from heterogeneous data sources to public service visionaryBIsolutionthat provideseffective,efficient reporting,analysisand scorecardingfromacollectionof

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Trnqvist et al. HFN: Technical Heterogeneity and Virtual PoLOs Proceedings of the 6th  

E-Print Network (OSTI)

. Hastily Formed Networks for Disaster Response: Technical Heterogeneity and Virtual Pockets of Local Order@ida.liu.se ABSTRACT As natural and man-made disasters become increasingly common, ensuring effective disaster response for post-disaster response, which are increasingly relying on emerging ICT infrastructures

402

Designing nanostructured heterogeneous catalysts to exploit pulsing in gas-liquid packed bed reactors  

E-Print Network (OSTI)

41 Designing nanostructured heterogeneous catalysts to exploit pulsing in gas-liquid packed bed nanostructured catalysts for gas-liquid reactions, which have a system of macro pores designed to take advantage in volume of gas-liquid packed bed reactors (a.k.a. "trickle" beds) by an order of magnitude or more because

McCready, Mark J.

403

Flexible and transparent supercapacitor based on In2O3 nanowire/carbon nanotube heterogeneous films  

E-Print Network (OSTI)

Flexible and transparent supercapacitor based on In2O3 nanowire/carbon nanotube heterogeneous films; accepted 17 December 2008; published online 28 January 2009 In this paper, a supercapacitor galvanostatic measurements. In addition, to study the stability of flexible and transparent supercapacitor

Zhou, Chongwu

404

Support vector regression for porosity prediction in a heterogeneous reservoir: A comparative study  

Science Conference Proceedings (OSTI)

In wells with limited log and core data, porosity, a fundamental and essential property to characterize reservoirs, is challenging to estimate by conventional statistical methods from offset well log and core data in heterogeneous formations. Beyond ... Keywords: Core data, Log data, Neural networks, Porosity estimation, Support vector machines

A. F. Al-Anazi; I. D. Gates

2010-12-01T23:59:59.000Z

405

A utility-based fuzzy TOPSIS method for energy efficient network selection in heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Mobile terminals in 4G heterogeneous wireless networks continuously undergo horizontal and vertical handovers. In order for a mobile terminal to be connected to a network in the best possible way in terms of QoS performance and energy consumption, access ... Keywords: Energy efficiency, Fuzzy multiple criteria decision-making, Network selection, TOPSIS, Utility functions, Vertical handover

Ioannis Chamodrakas; Drakoulis Martakos

2012-07-01T23:59:59.000Z

406

A utility-based fuzzy TOPSIS method for energy efficient network selection in heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Mobile terminals in 4G heterogeneous wireless networks continuously undergo horizontal and vertical handovers. In order for a mobile terminal to be connected to a network in the best possible way in terms of QoS performance and energy consumption, access ... Keywords: Energy efficiency, Fuzzy multiple criteria decision-making, Network selection, TOPSIS, Utility functions, Vertical handover

Ioannis Chamodrakas; Drakoulis Martakos

2011-06-01T23:59:59.000Z

407

EECHE: energy-efficient cluster head election protocol for heterogeneous wireless sensor networks  

Science Conference Proceedings (OSTI)

A wireless sensor network with a large number of tiny sensor nodes can be used as an effective tool for gathering data in various situations. One of the major issues in wireless sensor network is developing an energy-efficient routing protocol which ... Keywords: clustering, energy efficient, heterogeneous, lifetime, sensor networks

Dilip Kumar; T. C. Aseri; R. B Patel

2009-01-01T23:59:59.000Z

408

A trigram hidden Markov model for metadata extraction from heterogeneous references  

Science Conference Proceedings (OSTI)

Our objective was to explore an efficient and accurate extraction of metadata such as author, title and institution from heterogeneous references, using hidden Markov models (HMMs). The major contributions of the research were the (i) development of ... Keywords: Bibliography, Hidden Markov models, Metadata extraction, Second order, Shrinkage

Bolanle Ojokoh; Ming Zhang; Jian Tang

2011-05-01T23:59:59.000Z

409

Estimating Nonparametric Random Utility Models with an Application to the Value of Time in Heterogeneous Populations  

Science Conference Proceedings (OSTI)

The estimation of random parameters by means of mixed logit models is now current practice for the analysis of transportation behaviour. One of the most straightforward applications is the derivation of willingness-to-pay distribution over a heterogeneous ... Keywords: B-spline, constrained optimization, mixed logit, nonparametric estimation

Fabian Bastin; Cinzia Cirillo; Philippe L. Toint

2010-11-01T23:59:59.000Z

410

Vector nonlinear time-series analysis of gamma-ray burst datasets on heterogeneous clusters  

Science Conference Proceedings (OSTI)

The simultaneous analysis of a number of related datasets using a single statistical model is an important problem in statistical computing. A parameterized statistical model is to be fitted on multiple datasets and tested for goodness of fit within ... Keywords: Data Analysis, Dynamic Load Balancing, Heterogeneous Computing

Ioana Banicescu; Ricolindo L. Cariòo; Jane L. Harvill; John Patrick Lestrade

2005-04-01T23:59:59.000Z

411

On the critical salt concentrations for particle detachment in homogeneous sand and heterogeneous Hanford sediments  

E-Print Network (OSTI)

Hanford sediments Abstract One of the mechanisms for sudden particle release is a decrease in groundwater and (b) mineralogically heterogeneous sediment, taken from the Hanford formation in southeast Washington the amount of particles released and the CSC were an order of magnitude higher for the Hanford sediment than

Weisbrod, Noam

412

On the critical salt concentrations for particle detachment in homogeneous sand and heterogeneous Hanford sediments  

E-Print Network (OSTI)

Hanford sediments Theresa Blumea,b , Noam Weisbrodc,*, John S. Selkera a Department of Bioengineering) mineralogically heterogeneous sediment, taken from the Hanford formation in southeast Washington. Stepwise the amount of particles released and the CSC were an order of magnitude higher for the Hanford sediment than

Selker, John

413

A platform for transcoding heterogeneous markup documents using ontology-based metadata  

Science Conference Proceedings (OSTI)

As new standards, markup languages, protocols, and client devices continue to emerge, the main problem of existing transcoding systems is the lack of intelligence to cope with the heterogeneous effects, including various transcoding policies, markup ... Keywords: Markup document, Ontology, Semantic web, Transcoding, Web services, XML

I-Ching Hsu; Li-Pin Chi; Sheau-Shong Bor

2009-05-01T23:59:59.000Z

414

Efficient heterogeneous execution on large multicore and accelerator platforms: Case study using a block tridiagonal solver  

Science Conference Proceedings (OSTI)

The algorithmic and implementation principles are explored in gainfully exploiting GPU accelerators in conjunction with multicore processors on high-end systems with large numbers of compute nodes, and evaluated in an implementation of a scalable block ... Keywords: Accelerator, GPU, Heterogeneous execution, Linear algebra, Memory management, Tridiagonal solver

Alfred J. Park, Kalyan S. Perumalla

2013-12-01T23:59:59.000Z

415

Radiation modeling using the Uintah heterogeneous CPU/GPU runtime system  

Science Conference Proceedings (OSTI)

The Uintah Computational Framework was developed to provide an environment for solving fluid-structure interaction problems on structured adaptive grids on large-scale, long-running, data-intensive problems. Uintah uses a combination of fluid-flow solvers ... Keywords: GPU, Keeneland, TitanDev, Uintah, adaptive, heterogeneous systems, hybrid parallelism, parallel, scalability

Alan Humphrey; Qingyu Meng; Martin Berzins; Todd Harman

2012-07-01T23:59:59.000Z

416

Modeling and rendering of heterogeneous translucent materials using the diffusion equation  

Science Conference Proceedings (OSTI)

In this article, we propose techniques for modeling and rendering of heterogeneous translucent materials that enable acquisition from measured samples, interactive editing of material attributes, and real-time rendering. The materials are assumed to ... Keywords: Appearance modeling and rendering, diffusion approximation, subsurface scattering

Jiaping Wang; Shuang Zhao; Xin Tong; Stephen Lin; Zhouchen Lin; Yue Dong; Baining Guo; Heung-Yeung Shum

2008-03-01T23:59:59.000Z

417

Solute spreading in nonstationary flows in bounded, heterogeneous unsaturated-saturated media  

E-Print Network (OSTI)

three cases: transport in a mean gravity-dominated flow, in an unsaturated flow with a water table in nonstationary flows in bounded, heterogeneous unsaturated-saturated media, Water Resour. Res., 39(3), 1049, doi et al., 1991; Jury and Scotter, 1994; Harter and Yeh, 1996a, 1996b]. [3] In most of these models

Lu, Zhiming

418

Stochastic analysis of flow in a heterogeneous unsaturated-saturated system  

E-Print Network (OSTI)

of multiscale, nonstationary medium features. The unsaturated and saturated zones are coupled through the water table, whose position is random in randomly heterogeneous porous media. The presence of the water table zones [e.g., Dagan and Bresler, 1979; Bresler and Dagan, 1981; Andersson and Shapiro, 1983; Yeh et al

Zhang, Dongxiao

419

Effective hydraulic parameters for steady state vertical flow in heterogeneous soils  

E-Print Network (OSTI)

to be consistent with the previous findings of mean- gradient unsaturated hydraulic conductivity [Yeh et al., 1985a correlation, boundary condition (surface pressure head), and elevation above the water table on the effective vertical flow in heterogeneous soils, Water Resour. Res., 39(8), 1227, doi:10.1029/2002WR001831, 2003. 1

Mohanty, Binayak P.

420

Numerical Methods for Transport{Dominated Flows in Heterogeneous Porous Media  

E-Print Network (OSTI)

; Frederico Furtado y Felipe Pereira z Li-Ming Yeh x Abstract In this paper we consider the problem problems in heterogeneous porous formations. In this paper we consider two-phase (water and oil) incompressible immiscible displacement. Physically this model represents the water ooding of a petroleum

Douglas Jr., Jim

Note: This page contains sample records for the topic "firm level heterogeneity" 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

Parallel morphological/neural processing of hyperspectral images using heterogeneous and homogeneous platforms  

Science Conference Proceedings (OSTI)

The wealth spatial and spectral information available from last-generation Earth observation instruments has introduced extremely high computational requirements in many applications. Most currently available parallel techniques treat remotely sensed ... Keywords: Heterogeneous computing, Hyperspectral imaging, Mathematical morphology, Neural networks, Parallel performance

Javier Plaza; Rosa Pérez; Antonio Plaza; Pablo Martínez; David Valencia

2008-03-01T23:59:59.000Z

422

Heterogeneous modeling of the uranium in situ recovery: Kinetic versus solubility Jrmy. Nosa,1, 2  

E-Print Network (OSTI)

Heterogeneous modeling of the uranium in situ recovery: Kinetic versus solubility control Jérémy Mines, Tour AREVA, 1 place Jean Millier, 92084 Paris La Défense Cedex, France The uranium in situ, into the deposit to selectively dissolve uranium. The solution enriched in uranium is pumped out and processed

Paris-Sud XI, Université de

423

Profiling Heterogeneous Multi-GPU Systems to Accelerate Cortically Inspired Learning Algorithms  

E-Print Network (OSTI)

Profiling Heterogeneous Multi-GPU Systems to Accelerate Cortically Inspired Learning Algorithms Andrew Nere, Atif Hashmi, and Mikko Lipasti Department of Electrical and Computer Engineering University a plausible, attractive, fault-tolerant, and energy- efficient possibility. Such attributes have once again

Lipasti, Mikko H.

424

Flexible on-chip power delivery for energy efficient heterogeneous systems  

Science Conference Proceedings (OSTI)

Heterogeneous systems-on-chip pose a challenge for power delivery given the variety of needs for different components. In this paper, we describe recent work that leverages power switches and conventional EDA toolflows to implement a set of power delivery ... Keywords: PDVS, dynamic voltage scaling, leakage, low power design, variable weighted headers

Benton H. Calhoun, Kyle Craig

2013-05-01T23:59:59.000Z

425

Application framework for management and monitoring of heterogeneous 6LoWPAN deployment  

Science Conference Proceedings (OSTI)

Large Scale Heterogeneous Wireless Sensor Networks require effective tools for monitoring and managing the network. In this paper, we discuss about the design and implementation of an application framework in order to monitor and manage a wireless sensor ... Keywords: 6LoWPAN, GNU radio, MICAz, TinyOS, blip, testbed application framework, universal software radio peripheral, wireless sensor networks

C. Rajgopal; Rakesh Peter

2011-12-01T23:59:59.000Z

426

Homogenization of a degenerate parabolic problem in a highly heterogeneous medium with highly anisotropic fibers  

Science Conference Proceedings (OSTI)

We consider the homogenization of a heat transfer problem in a periodic medium, consisting of a set of highly anisotropic fibers surrounded by insulating layers, the whole being embedded in a third material having a conductivity of order 1. The conductivity ... Keywords: Degenerate parabolic problem, Highly anisotropic fibers, Highly heterogeneous medium, Homogenization

Ahmed Boughammoura

2009-01-01T23:59:59.000Z

427

STUDY OF THE MTC ESTIMATION BY NOISE ANALYSIS IN 2-D HETEROGENEOUS SYSTEMS  

E-Print Network (OSTI)

theory in heterogeneous cores. For that purpose, among other quantities, the reactor transfer function detectors. SMORN VIII, A Symposium on Nuclear Reactor Surveillance and Diagnostics. Gothenburg, Sweden, 27 Department of Reactor Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden ABSTRACT

Demazière, Christophe

428

Power-aware linear programming based scheduling for heterogeneous computer clusters  

Science Conference Proceedings (OSTI)

In the past few years, scheduling for computer clusters has become a hot topic. The main focus has been towards achieving better performance. It is true that this goal has been attained to a certain extent, but on the other hand, it has been at the expense ... Keywords: Grid computing, Heterogeneous computing systems, Linear programming, Power-aware scheduling

Hadil Al-Daoud; Issam Al-Azzoni; Douglas G. Down

2012-05-01T23:59:59.000Z

429

A survey of vertical handover decision algorithms in Fourth Generation heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Vertical handover decision (VHD) algorithms are essential components of the architecture of the forthcoming Fourth Generation (4G) heterogeneous wireless networks. These algorithms need to be designed to provide the required Quality of Service (QoS) ... Keywords: 4G, Fourth Generation, Vertical handover, Wireless networks

Xiaohuan Yan; Y. Ahmet ?ekercio?lu; Sathya Narayanan

2010-08-01T23:59:59.000Z

430

Message-driven based energy-efficient routing in heterogeneous delay-tolerant networks  

Science Conference Proceedings (OSTI)

Delay-Tolerant Network (DTN) nodes are mostly energy-limited devices that run on battery power. DTN routing strategies on such resource-constrained nodes therefore need to be energy efficient. Contemporary routing protocols such as Two-Hop Routing (2HR) ... Keywords: dtn, energy efficiency, heterogeneity, performance modeling, routing

V. K. Chaithanya Manam; V. Mahendran; C. Siva Ram Murthy

2012-10-01T23:59:59.000Z

431

Interdependencies of coupled heterogeneous infrastructures: the case of ICT and Energy  

E-Print Network (OSTI)

for better load forecasting of potential load cascading - when large unbalances of load are found between be simulated include load variations associated with contingencies in the electric network and also failures behaviour, heterogeneity 1. INTRODUCTION During more than a century of electricity, the society became more

Paris-Sud XI, Université de

432

A stochastic variational multiscale method for diffusion in heterogeneous random media  

Science Conference Proceedings (OSTI)

A stochastic variational multiscale method with explicit subgrid modelling is provided for numerical solution of stochastic elliptic equations that arise while modelling diffusion in heterogeneous random media. The exact solution of the governing equations ... Keywords: generalized polynomial chaos, multiscale finite element, operator upscaling, stochastic diffusion, subgrid modelling, variational multiscale

Badrinarayanan Velamur Asokan; Nicholas Zabaras

2006-11-01T23:59:59.000Z

433

Numerical simulation of three-phase flow in heterogeneous porous media  

Science Conference Proceedings (OSTI)

We describe an efficient numerical simulator, based on an operator splitting technique, for three-phase flow in heterogeneous porous media that takes into account capillary forces, general relations for the relative permeability functions and variable ... Keywords: central difference scheme, mixed finite elements, non-classical waves, operator splitting, porous media, three-phase flow

Eduardo Abreu; Frederico Furtado; Felipe Pereira

2006-06-01T23:59:59.000Z

434

A Holonic Control Architecture for a Heterogeneous Multi-Objective Smart Micro-Grid  

E-Print Network (OSTI)

A Holonic Control Architecture for a Heterogeneous Multi-Objective Smart Micro-Grid Sylvain Frey--Designing the control infrastructure of future "smart" power grids is a challenging task. Such grids will integrate scales. Smart grids will need to control these in order to attain global objectives at the macro

Diaconescu, Ada

435

Seismic Determination of Reservoir Heterogeneity: Application to the Characterization of Heavy Oil Reservoirs  

SciTech Connect

The objective of the project was to examine how seismic and geologic data could be used to improve characterization of small-scale heterogeneity and their parameterization in reservoir models. Performed a theoretical and numerical study to examine which subsurface features the surface seismic method actually resolves.

Imhof, Matthias G.; Castle, James W.

2003-03-12T23:59:59.000Z

436

Long-term Differences in Tillage and Land Use Affect Intra-aggregate Pore Heterogeneity  

SciTech Connect

Recent advances in computed tomography provide measurement tools to study internal structures of soil aggregates at micrometer resolutions and to improve our understanding of specific mechanisms of various soil processes. Fractal analysis is one of the data analysis tools that can be helpful in evaluating heterogeneity of the intra-aggregate internal structures. The goal of this study was to examine how long-term tillage and land use differences affect intra-aggregate pore heterogeneity. The specific objectives were: (i) to develop an approach to enhance utility of box-counting fractal dimension in characterizing intra-aggregate pore heterogeneity; (ii) to examine intra-aggregate pores in macro-aggregates (4-6 mm in size) using the computed tomography scanning and fractal analysis, and (iii) to compare heterogeneity of intra-aggregate pore space in aggregates from loamy Alfisol soil subjected to 20 yr of contrasting management practices, namely, conventional tillage (chisel plow) (CT), no-till (NT), and native succession vegetation (NS). Three-dimensional images of the intact aggregates were obtained with a resolution of 14.6 {micro}m at the Advanced Photon Source, Argonne National Laboratory, Argonne, IL. Proposed box-counting fractal dimension normalization was successfully implemented to estimate heterogeneity of pore voxel distributions without bias associated with different porosities in soil aggregates. The aggregates from all three studied treatments had higher porosity associated with large (>100 {micro}m) pores present in their centers than in their exteriors. Pores 15 to 60 {micro}m were equally abundant throughout entire aggregates but their distributions were more heterogeneous in aggregate interiors. The CT aggregates had greater numbers of pores 15 to 60 {micro}m than NT and NS. Distribution of pore voxels belonging to large pores was most heterogeneous in the aggregates from NS, followed by NT and by CT. This result was consistent with presence of very large pores associated with former root channels in NT and NS aggregates. Our findings indicate that mechanisms of macro-aggregate formation might differ in their importance in different land use and management practices.

Kravchenko, A.N.; Wang, A.N.W.; Smucker, A.J.M.; Rivers, M.L. (MSU); (UC)

2012-10-25T23:59:59.000Z

437

Heterogeneous catalytic process for alcohol fuels from syngas. Fifth quarterly technical progress report, January--March, 1993  

DOE Green Energy (OSTI)

Objective is to evaluate heterogeneous catalysts for converting syngas to oxygenates for use as fuel enhancers, and to develop the best total process for converting syngas to liquid fuels. Two tasks are being pursued: Catalyst R and D, and engineering studies. Initial work will be on the isobutanol catalyst system. A microreactor has been prepared for screening heterogeneous catalysts.

Not Available

1993-11-01T23:59:59.000Z

438

Combustion, Explosion, and Shock Waves, Vol. 46, No. 3, pp. , 2010 Combustion of Heterogeneous Nanostructural Systems (Review)  

E-Print Network (OSTI)

Combustion, Explosion, and Shock Waves, Vol. 46, No. 3, pp. ­, 2010 Combustion of Heterogeneous submitted November 26, 2009. The current status of research in the field of combustion of heterogeneous mechanisms of combustion in such systems and prospects of their further applications are discussed. Key words

Mukasyan, Alexander

439

Genetic Algorithm Based Scheduling of Meta-Tasks with Stochastic Execution Times in Heterogeneous Computing Systemst1  

Science Conference Proceedings (OSTI)

In this study, we address the meta-task scheduling problem in heterogeneous computing (HC) systems, which is to find a task assignment that minimizes the schedule length of a meta-task composed of several independent tasks with no data dependencies. ... Keywords: genetic algorithm, heterogeneous computing, meta-task, stochastic scheduling, task allocation

Atakan Do?an; Füsun özgüner

2004-04-01T23:59:59.000Z

440

A reactive transport modeling approach to simulate biogeochemical processes in pore structures with pore-scale heterogeneities  

Science Conference Proceedings (OSTI)

Redox processes, including degradation of organic contaminants, are often controlled by microorganisms residing in natural porous media like soils or aquifers. These environments are characterized by heterogeneities at various scales which influence ... Keywords: Bioavailability, Biodegradation, Pore networks, Pore-scale heterogeneity, Reactive transport models, Spatial distributions

Mehdi Gharasoo; Florian Centler; Pierre Regnier; Hauke Harms; Martin Thullner

2012-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

GATS 1.0: a novel GA-based scheduling algorithm for task scheduling on heterogeneous processor nets  

Science Conference Proceedings (OSTI)

We present a novel GA-based scheduling algorithm for heterogeneous processor networks that succeeds in generating task schedules with completion times that are 7% and 10.1% shorter than those produced by two of the best existing scheduling algorithms ... Keywords: genetic algorithm, heterogeneous systems, parallel processing, scheduling

Mohammad Daoud; Nawwaf Kharma

2005-06-01T23:59:59.000Z

442

Liquid level controller  

DOE Patents (OSTI)

A system for maintaining two distinct sodium levels within the shell of a heat exchanger having a plurality of J-shaped modular tube bundles each enclosed in a separate shell which extends from a common base portion. A lower liquid level is maintained in the base portion and an upper liquid level is maintained in the shell enwrapping the long stem of the J-shaped tube bundles by utilizing standpipes with a notch at the lower end which decreases in open area the distance from the end of the stand pipe increases and a supply of inert gas fed at a constant rate to produce liquid levels, which will remain generally constant as the flow of liquid through the vessel varies. (auth)

Mangus, J.D.; Redding, A.H.

1975-07-15T23:59:59.000Z

443

Learning at the boundary of the firm : learning-by-interaction between a manufacturer and its users  

E-Print Network (OSTI)

My dissertation centers on the very nature of the interaction and the learning that happens between users and manufacturers, and explores various micro-level mechanisms, which I call, "learning-by-interaction." The core ...

Bae, Sung Joo

2009-01-01T23:59:59.000Z

444

A Combined Electrochemical and Ultra-High Vacuum Approach to Heterogeneous  

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

A Combined Electrochemical and Ultra-High Vacuum Approach to Heterogeneous A Combined Electrochemical and Ultra-High Vacuum Approach to Heterogeneous Electrocatalysis Friday, February 24, 2012 - 11:00am SSRL Bldg. 137-322, 3rd floor Conference Room Matthew A. Rigsby, Oak Ridge National Laboratory Improved energy conversion and storage technologies are crucial for meeting the growing energy demands of the world. Understanding the factors that are currently limiting the advancement of these technologies is vital. One must examine the fundamental properties of electrocatalyst/photoelectrocatalyst materials and the fluid-solid interfaces of which they are a part, and one of the simplest ways to do this is to study model electrocatalyst systems. In the work presented here, studies began with real nanoparticle fuel cell electrocatalysts that demonstrated the key relationship between reactivity

445

Stochastic Finite Element Analysis for Multiphase Flow in Heterogeneous Porous Media  

E-Print Network (OSTI)

. This study is concerned with developing a two-dimensional multiphase model that simulates the movement of NAPL in heterogeneous aquifers. Heterogeneity is dealt with in a probabilistic sense by modeling the intrinsic permeability of the porous medium as a stochastic process. The deterministic finite element method is used to spatially discretize the multiphase flow equations. The intrinsic permeability is represented in the model via its Karhunen-Loeve expansion (Ghanem and Spanos, 1991). This is a computationally expedient representation of stochastic processes by means of a discrete set of random variables. Further, the nodal unknowns, water phase saturations and water phase pressures, are represented by their stochastic spectral expansions. This representation involves an orthogonal basis in the space of random variables. The basis consists of orthogonal polynomial chaoses of consecutive orders. The relative permeabilities of water and oil phases, and the capillary pressure are ex...

R. Ghanem; S. Dham

1998-01-01T23:59:59.000Z

446

Genetic Programming for Evolving a Heterogenous Multi-agent System in a Dynamic Environment  

E-Print Network (OSTI)

The Robocup Rescue Simulation System (RCRSS) is dynamic system of of multi-agent interaction, simulating a large-scale urban disaster scenario. Teams of rescue agents are charged with the tasks of minimizing civilian casualties and infrastructure damage while competing against limitations on time, communication, and awareness. There have been numerous approaches to solving the problems of the RCRSS, but as of yet, no attempts to use Genetic Programming (GP) have been reported. GP is a popular form of automatic programming which utilizes the evolutionary mechanism of Genetic Algorithms (GA) to evolve a potentially complex program from simplistic primitives. This is the approach that will be used in this thesis to evolve the behaviours of a heterogenous set of cooperating agents for the RCRSS. Specifically, this thesis will study GP’s ability to evolve individual behaviours such as appropriate action selection, cooperation amongst homogenous and heterogenous teams of agents, and task assignment. 1 1

Andrew Runka; Dr. Vladimir Wojcik

2009-01-01T23:59:59.000Z

447

Theory of ultrafast heterogeneous electron transfer: Contributions of direct charge transfer excitations to the absorbance  

Science Conference Proceedings (OSTI)

Absorption spectra related to heterogeneous electron transfer are analyzed with the focus on direct charge transfer transition from the surface attached molecule into the semiconductor band states. The computations are based on a model of reduced dimensionality with a single intramolecular vibrational coordinate but a complete account for the continuum of conduction band states. The applicability of this model to perylene on TiO{sub 2} has been demonstrated in a series of earlier papers. Here, based on a time-dependent formulation, the absorbance is calculated with the inclusion of charge transfer excitations. A broad parameter set inspired by the perylene TiO{sub 2} systems is considered. In particular, the description generalizes the Fano effect to heterogeneous electron transfer reactions. Preliminary simulations of measured spectra are presented for perylene-catechol attached to TiO{sub 2}.

Wang, Luxia; Willig, Frank; May, Volkhard [Department of Physics, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, 100083 Beijing (China); Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin (Germany); Institut fuer Physik, Humboldt-Universitaet zu Berlin, Newtonstrasse 15, D-12489 Berlin (Germany)

2007-04-07T23:59:59.000Z

448

Unified nuclear core activity map reconstruction using heterogeneous instruments with data assimilation  

E-Print Network (OSTI)

Evaluating the neutronic state of the whole nuclear core is a very important topic that have strong implication for nuclear core management and for security monitoring. The core state is evaluated using measurements. Usually, part of the measurements are used, and only one kind of instruments are taken into account. However, the core state evaluation should be more accurate when more measurements are collected in the core. But using information from heterogeneous sources is at glance a difficult task. This difficulty can be overcome by Data Assimilation techniques. Such a method allows to combine in a coherent framework the information coming from model and the one coming from various type of observations. Beyond the inner advantage to use heterogeneous instruments, this leads to obtain a significant increasing of the quality of neutronic global state reconstruction with respect to individual use of measures. In order to present this approach, we will introduce here the basic principles of data assimilation f...

Bouriquet, Bertrand; Erhard, Patrick; Ponçot, Angélique

2011-01-01T23:59:59.000Z

449

Heterogeneous nucleation of ice on anthropogenic organic particles collected in Mexico City  

SciTech Connect

This study reports on heterogeneous ice nucleation activity of predominantly organic (or coated with organic material) anthropogenic particles sampled within and around the polluted environment of Mexico City. The onset of heterogeneous ice nucleation was observed as a function of particle temperature (Tp), relative humidity (RH), nucleation mode, and particle chemical composition which is influenced by photochemical atmospheric aging. Particle analyses included computer controlled scanning electron microscopy with energy dispersive analysis of X-rays (CCSEM/EDX) and scanning transmission X-ray microscopy with near edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS). In contrast to most laboratory studies employing proxies of organic aerosol, we show that anthropogenic organic particles collected in Mexico City can potentially induce ice nucleation at experimental conditions relevant to cirrus formation. The results suggest a new precedent for the potential impact of organic particles on ice cloud formation and climate.

Knopf, D.A.; Wang, B.; Laskin, A.; Moffet, R.C.; Gilles, M.K.

2010-06-20T23:59:59.000Z

450

Binary Heterogeneous Superlattices Assembled from Quantum Dots and Gold Nanoparticles with DNA  

SciTech Connect

Controllable assembly of three-dimensional (3D) superlattices composed of different types of nanoscale objects opens new opportunities for material fabrication. Herein we show the successful assembly of heterogeneous 3D structures from gold nanoparticles (AuNPs) and quantum dots (QDs) using DNA encoding. By applying synchrotron-based small-angle X-ray scattering, we found that AuNPs and QDs are positioned in a body-centered cubic lattice, while each particle type, AuNP and QD, is arranged in a simple-cubic manner. Our studies demonstrate a route for assembly of integrated heterogeneous 3D structures from different nano-objects by DNA-encoded interactions.

D Sun; O Gang

2011-12-31T23:59:59.000Z

451

Heterogeneous mixtures of elliptical particles: Directly resolving local and global properties and responses  

Science Conference Proceedings (OSTI)

In our earlier papers, Prosperetti's seminal Physalis method for fluid flows was extended to directly resolve electric fields in finite-sized particles and to investigate accurately the mutual fluid-particle, particle-particle, and particle-boundary ... Keywords: Directly resolving particles, Discontinuous interface condition, Elliptical particles, Elongated rod-like particle, Force and torque on particles, Heterogeneous functional materials, Interactions, Local charge distribution, Orientation and anisotropy, Singularity in elliptic coordinates

Qianlong Liu; Kenneth L. Reifsnider

2013-02-01T23:59:59.000Z

452

Improved Efficiency of Miscible CO2 Floods and Enhanced Prospects for CO2 Flooding Heterogeneous Reservoirs  

SciTech Connect

The goal of this project is to improve the efficiency of miscible CO2 floods and enhance the prospects for flooding heterogeneous reservoirs. This report provides results of the second year of the three-year project that will be exploring three principles: (1) Fluid and matrix interactions (understanding the problems). (2) Conformance control/sweep efficiency (solving the problems. 3) Reservoir simulation for improved oil recovery (predicting results).

Grigg, Reid B.; Schechter, David S.

1999-10-15T23:59:59.000Z

453

Growth, Development and Natural Resources: New Evidence Using a Heterogeneous Panel Analysis  

E-Print Network (OSTI)

, resource rich countries perform poorly when compared to countries which are not endowed with oil, natural gas, minerals and other non-renewable resources. Therefore, resource abun- dance is believed to be an important determinant of economic failure, which... Growth, Development and Natural Resources: New Evidence Using a Heterogeneous Panel Analysis#3; Tiago V. de V. Cavalcanti, Kamiar Mohaddes, and Mehdi Raissi Faculty of Economics, University of Cambridge November 4, 2009 Abstract This paper explores...

Cavalcanti, T V V; Mohaddes, K; Raissi, M

454

Predictability of Fixed-Job Priority Schedulers on Heterogeneous Multiprocessor Real-Time Systems  

E-Print Network (OSTI)

The multiprocessor Fixed-Job Priority (FJP) scheduling of real-time systems is studied. An important property for the schedulability analysis, the predictability (regardless to the execution times), is studied for heterogeneous multiprocessor platforms. Our main contribution is to show that any FJP schedulers are predictable on unrelated platforms. A convenient consequence is the fact that any FJP schedulers are predictable on uniform multiprocessors.

Cucu-Grosjean, Liliana

2009-01-01T23:59:59.000Z

455

Independent assessment of the natural-circulation capability of the heterogeneous-core CRBR  

SciTech Connect

This summary describes results of an independent assessment of the natural circulation capability of the heterogeneous core Clinch River Breeder Reactor Plant (CRBRP) following station blackout. The primary tool for this analysis is the Super System Code (SSC) which was developed at Brookhaven National Laboratory. Comparisons are made between SSC and the project's analysis, with emphasis on the effect of inter-assembly flow redistribution.

Guppy, J.G.; Horak, W.C.; Van Tuyle, G.J.

1983-01-01T23:59:59.000Z

456

Characterization of Small Scale Heterogeneity for Prediction of Acid Fracture Performance  

E-Print Network (OSTI)

Recently developed models of the acid fracturing process have shown that the differential etching necessary to create lasting fracture conductivity is caused by the heterogeneous distributions of permeability and mineralogy along the fracture faces. To predict the conductivity that can be created by acid in a particular formation, the models require information about these formation properties. This research aims to quantify correlation lengths using a geostatistical description of small scale heterogeneity to ascertain the distribution of permeability and mineralogy in a carbonate formation. The correlation length parameters are a first step in being able to couple acid transport and rock dissolution models at reservoir scale with a model of fracture conductivity based on channels and roughness features caused by small scale heterogeneity. Geostatistical parameters of small scale heterogeneity affecting wells in the Hugoton Field are developed. Data leading to their derivation are obtained from a combination of well logs and cores. The permeability of slabbed core is measured to yield vertical correlation length. Well logs are used to estimate permeability via an empirical relationship between core plug permeability and well log data for calculation of horizontal correlation length. A fracture simulator computes the acid etched fracture width for known treatment conditions. The resulting geostatistical parameters and acid etched width are used to predict acid fracture performance for a well in the Hugoton Field. Application of new model conductivity correlations results in a unique prediction for the acid fracture case study that differs from the industry standard. Improvements in low cost stimulation treatments such as acid fracturing are the key to revitalizing production in mature carbonate reservoirs like the Hugoton Field. Planning and development of new wells in any carbonate formation necessarily must consider acid fracturing as a production stimulation technique. Reliable models that accurately predict acid fracture conductivity can be used to make an informed investment decision.

Beatty, Cassandra Vonne

2010-08-01T23:59:59.000Z

457

The Computational Modeling of Alloys:From ab initio and thermodynamics to heterogeneous precipitation.  

SciTech Connect

In this lecture we presented a methodology to obtain free energies from empirical potentials and applied it to the study of the phase diagram of FeCr. Subsequently, we used Metropolis Monte Carlo to analyze homogeneous and heterogeneous precipitation of the Cr rich solid solution {alpha}{prime}. These examples are part of our work in the area of steels for nuclear applications and can be found in several publications of our group cited as References.

Caro, A

2007-10-09T23:59:59.000Z

458

Scale-up of miscible flood processes for heterogeneous reservoirs. Second annual report  

SciTech Connect

Progress is reported for a comprehensive investigation of the scaling behavior of gas injection processes in heterogeneous reservoirs. The interplay of phase behavior, viscous fingering, gravity segregation, capillary imbibition and drainage, and reservoir heterogeneity is examined in a series of simulations and experiments. Use of streamtube to model multiphase flow is demonstrated to be a fast and accurate approach for displacements that are dominated by reservoir heterogeneity. The streamtube technique is particularly powerful for multiphase compositional displacements because it represents the effects of phase behavior with a one-dimensional flow and represents the effects of heterogeneity through the locations of streamtubes. A new approach for fast calculations of critical tie-lines directly from criticality conditions is reported. A global triangular structure solution for four-component flow systems, whose tie-lies meet at the edge of a quaternary phase diagram or lie in planes is presented. Also demonstrated is the extension of this solution to multicomponent systems under the same assumptions. The interplay of gravity, capillary and viscous forces on final residual oil saturation is examined experimentally and theoretically. The analysis of vertical equilibrium conditions for three-phase gravity drainage shows that almost all oil can be recovered from the top part of a reservoir. The prediction of spreading and stability of thin film is performed to investigate three-phase gravity drainage mechanisms. Finally, experimental results from gravity drainage of crude oil in the presence of CO{sub 2} suggest that gravity drainage could be an efficient oil recovery process for vertically fractured reservoirs.

Orr, F.M. Jr.

1995-03-01T23:59:59.000Z

459

Contact angle hysteresis of cylindrical drops on chemically heterogeneous striped surfaces  

E-Print Network (OSTI)

Contact angle hysteresis of a macroscopic droplet on a heterogeneous but flat substrate is studied using the interface displacement model. First, the apparent contact angle of a droplet on a heterogeneous surface under the condition of constant volume is considered. By assuming a cylindrical liquid-vapor surface (meniscus) and minimizing the total free energy, we derive an equation for the apparent contact angle, which is similar but different from the well-known Cassie's law. Next, using this modified Cassie's law as a guide to predict the behavior of a droplet on a heterogeneous striped surface, we examine several scenarios of contact angle hysteresis using a periodically striped surface model. By changing the volume of the droplet, we predict a sudden jump of the droplet edge, and a continuous change of the apparent contact angle at the edge of two stripes. Our results suggest that as drop volume is increased (advancing contact lines), the predominant drop configuration observed is the one whose contact angle is large; whereas, decreasing drop volume from a large value (receding contact lines) yields drop configuration that predominantly exhibit the smaller contact angle.

Masao Iwamatsu

2005-11-26T23:59:59.000Z

460

Pore-scale simulations of drainage of heterogeneous and anisotropic porous media  

Science Conference Proceedings (OSTI)

A numerical model based on smoothed particle hydrodynamics (SPH) was used to simulate pore-scale liquid and gas flow in synthetic two-dimensional porous media consisting of non-overlapping grains. The model was used to study effects of pore scale heterogeneity and anisotropy on unsaturated flow and the saturation-pressure relationship. Pore scale anisotropy was created by using co-oriented non overlapping elliptical grains, and heterogeneity was created by inserting a micro-fracture in the middle of the porous domain consisting of non-overlapping circular grains. The effect of wetting fluid properties on drainage was also investigated. Capillary-pressure saturation curves resulting from fluid drainage through boundaries parallel and perpendicular the fracture alignment were qualitatively similar to those observed in gap-graded sediments with bimodal grain-size and pore-size distributions. Those derived from drainage on a boundary oriented perpendicular to particle and fracture alignment were qualitatively similar to those for mono-modal pore-size distributions. It is shown that pore-scale heterogeneity and anisotropy can gave rise to capillary pressure-saturation relationships and entry (bubbling) pressures that depend on flow direction suggesting that these properties should be described by tensor rather than scalar quantities.

Tartakovsky, Alexandre M.; Ward, Anderson L.; Meakin, Paul

2007-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

A Monte Carlo method of evaluating heterogeneous effects in plate-fueled reactors  

SciTech Connect

Few-group nuclear cross sections for small plate-fueled, light and heavy water test reactors are frequently generated with unit cell models that contain a homogeneous mixture of fuel, cladding, and water. The heterogeneous unit cells do not need to be represented explicitly for neutronics calculations when the plate and coolant channel thicknesses are small compared with the mean-free-path of neutrons. However, neutron and photon heating calculations were performed with heterogeneous fuel models to predict accurately the heat deposited in the fuel meat, cladding, and coolant. Heat deposited in the coolant channels and outside the fuel elements does not have a direct impact on the peak fuel meat temperature but must be included in the total coolant system heat balance. The results of a heterogeneous Monte Carlo calculation that estimates the heat loads in different fuel regions are presented and the fact that similar homogeneous fuel models can be used for many calculations. The calculations presented here were performed on models of the Advanced Neutron Source (ANS) and the Massachusetts Institute of Technology Reactor 2 (MITR-2). The ANS is a small, 362-MW (fission), plate-fueled, heavy water reactor designed to produce an intense steady-state source of neutrons.

Thayer, R.C.; Redmond, E.L. II; Ryskamp, J.M. (Idaho National Engineering Lab., Idaho Falls (United States))

1991-01-01T23:59:59.000Z

462

Dispersion measurement as a method of quantifying geologic characterization and defining reservoir heterogeneity. Final report  

Science Conference Proceedings (OSTI)

The main objective of this research project is to investigate dispersion as a method of quantifying geological characterization and defining reservoir heterogeneity in order to enhance crude oil recovery. The dispersion of flow of a reservoir rock (dispersion coefficient and dispersivity) was identified as one of the physical properties of a reservoir rock by measuring the mixing of two miscible fluids, one displacing the other in a porous medium. A rock was 100% saturated with a resident fluid and displaced by a miscible fluid of equal viscosity and equal density. Some specific experiments were performed with unequal densities. Produced fluid was analyzed by refractometer, nuclear reaction, electrical conductivity and X-ray scan. Several physical and flow characteristics were measured on the sand rock sample in order to establish correlations with the measured dispersion property. Absolute permeability, effective porosity, relative permeability, capillary pressure, the heterogeneity factor and electrical conductivity were used to better understand the flow system. Linear, transverse, 2-D and 3-D dispersions were measured and used to characterize the rock heterogeneity of the flow system. A new system of measuring dispersion was developed using a gas displacing gas system in a porous medium. An attempt was also made to determine the dispersion property of an actual reservoir from present day well log data on a producing well. 275 refs., 102 figs., 17 tabs.

Menzie, D.E.

1995-05-01T23:59:59.000Z

463

"Medium-tech" industries may be of greater importance to a local economy than "High-tech" firms: New methods for measuring the knowledge base of an economic system  

E-Print Network (OSTI)

In this paper we offer a way to measure the knowledge base of an economy in terms of probabilistic entropy. This measure, we hypothesize, is an indication of the extent to which a system, including the economic system, self-organizes. In a self-organizing system, interactions between dimensions or subsystems will unintentionally give rise to anticipations that are properly aligned. The potential reduction of uncertainty can be measured as negative entropy in the mutual information among three (or more) dimensions. For a knowledge-based economy, three dimensions can be considered as key: the distribution of firm sizes, the geographical locations, and the technological classifications of firms. Based on statistics of these three dimensions and drawing on a unique dataset of all Dutch firms registered with the Chambers of Commerce, we are able to refine well-known empirical findings for the geographical dimension. Counter-intuitive, however, are our empirical findings for the dimension of technology. Knowledge d...

Dolfsma, Wilfred

2009-01-01T23:59:59.000Z

464

The Effects of Heterogeneities on Seismic Wave Propagation in the Climax Stock  

Science Conference Proceedings (OSTI)

The Comprehensive Nuclear Test-Ban Treaty requires the ability to detect low-yield (less than 150kton) nuclear events. This kind of monitoring can only be done seismically on a regional scale (within 2000km). At this level, it is difficult to distinguish between low-yield nuclear events and non-nuclear events of similar magnitude. In order to confidently identify a nuclear event, a more detailed understanding of nuclear seismic sources is needed. In particular, it is important to know the effects of local geology on the seismic signal. This study focuses on P-wave velocity in heterogeneous granitoid. The Source Physics Experiment (SPE) is currently performing low-yield tests with chemical explosives at the Nevada National Security Site (NNSS). The exact test site was chosen to be in the Climax Stock, a cretaceous granodiorite and quartz-monzonite pluton located in Area 15 of the NNSS. It has been used in the past for the Hard Hat and Pile Driver nuclear tests, which provided legacy data that can be used to simulate wave propagation. The Climax Stock was originally chosen as the site of the SPE partly because of its assumed homogeneity. It has since been discovered that the area of the stock where the SPE tests are being performed contains a perched water table. In addition, the stock is known to contain an extensive network of faults, joints, and fractures, but the exact effect of these structural features on seismic wave velocity is not fully understood. The SPE tests are designed to seismically capture the explosion phenomena from the near- to the far-field transition of the seismic waveform. In the first SPE experiment, 100kg of chemical explosives were set off at a depth of 55m. The blast was recorded with an array of sensors and diagnostics, including accelerometers, geophones, rotational sensors, short-period and broadband seismic sensors, Continuous Reflectometry for Radius vs. Time Experiment, Time of Arrival, Velocity of Detonation, and infrasound sensors. The focus of this study is two-fold: (1) the geophone array that was focused over the SPE shot and (2) a high-resolution seismic profile that was recently acquired at the field site. The geophone array was placed radially around the SPE shot in five directions with 100m spacing and out to a distance of 2 km. The high-resolution profile was about 475m in length with station and shot spacing of 5m using a 7000lb mini-vibe as a source. In both data sets, the first arrivals will be used to develop velocity models. For the geophone array, 1-D P-wave velocity models will be developed to determine an average apparent velocity of the Climax Stock. The high-resolution data will be used to develop a 2-D P-wave velocity model along the seismic profile. This is in an effort to elucidate the water table in more detail and provide additional information on the near-surface structure. These results will be used in the overall modeling effort to fully characterize the test bed and develop a physics-based model to simulate seismic energy from the SPE events.

Hagan Webb, C., Snelson, C. M., White, R., Emmitt, R., Barker, D., Abbott, R., Bonal, N.

2011-12-01T23:59:59.000Z

465

A flexible computer software package for industrial steam reformers and methanators based on rigorous heterogeneous mathematical models  

Science Conference Proceedings (OSTI)

An advanced software package for industrial steam reformers based upon heterogeneous models for the catalyst tube is developed and successfully checked against a number of top-fired and side-fired industrial reformers. The package is further developed ...

F. M. Alhabdan; M. A. Abashar; S. S. E. Elnashaie

1992-11-01T23:59:59.000Z

466

Effective Hydraulic Parameters in Horizontally and Vertically Heterogeneous Soils for Steady-State Land–Atmosphere Interaction  

Science Conference Proceedings (OSTI)

In this study, the authors investigate effective soil hydraulic parameter averaging schemes for steady-state flow in heterogeneous shallow subsurfaces useful to land–atmosphere interaction modeling. “Effective” soil hydraulic parameters of the ...

Binayak P. Mohanty; Jianting Zhu

2007-08-01T23:59:59.000Z

467

Origin of geochemical heterogeneity in the mantle : constraints from volcanism associated with Hawaiian and Kerguelen mantle plumes  

E-Print Network (OSTI)

Lavas derived from long-lived mantle plumes provide important information of mantle compositions and the processes that created the geochemical heterogeneity within the mantle. Kerguelen and Hawaii are two long-lived mantle ...

Xu, Guangping

2007-01-01T23:59:59.000Z

468

The Theory of Ice Nucleation by Heterogeneous Freezing of Deliquescent Mixed CCN. Part I: Critical Radius, Energy, and Nucleation Rate  

Science Conference Proceedings (OSTI)

This paper extends previous work on the theory of heterogenous ice nucleation. The goals of this analysis are to explain empirical observations of ice nucleation and to provide a suitable framework for modeling and parameterizing the ice ...

Vitaly I. Khvorostyanov; Judith A. Curry

2004-11-01T23:59:59.000Z

469

An Approach for the Representation of Surface Heterogeneity in Land Surface Models. Part II: Validation and Sensitivity Experiments  

Science Conference Proceedings (OSTI)

This paper discusses a series of sensitivity experiments aimed at testing the surface heterogeneity representation proposed in the companion paper by Giorgi. When driven by observed climatic forcings at three locations and run in point mode, the ...

Filippo Giorgi

1997-08-01T23:59:59.000Z

470

Determination of Coke Calcination Level and Anode Baking Level  

Science Conference Proceedings (OSTI)

Presentation Title, Determination of Coke Calcination Level and Anode Baking Level – Application and Reproducibility of Lc Based Methods. Author(s), Stein ...

471

Company Level Imports  

U.S. Energy Information Administration (EIA) Indexed Site

All Petroleum & Other Liquids Reports All Petroleum & Other Liquids Reports Company Level Imports With Data for September 2013 | Release Date: November 27, 2013 | Next Release Date: December 30, 2013 | XLS Previous Issues Month: September 2013 August 2013 July 2013 June 2013 May 2013 April 2013 March 2013 February 2013 January 2013 prior issues Go September 2013 Import Highlights Monthly data on the origins of crude oil imports in September 2013 has been released and it shows that two countries exported more than 1 million barrels per day to the United States (see table below). The top five exporting countries accounted for 75 percent of United States crude oil imports in September while the top ten sources accounted for approximately 92 percent of all U.S. crude oil imports. The top five sources of US crude

472

Liquid level detector  

DOE Patents (OSTI)

A liquid level detector for conductive liquids for vertical installation in a tank, the detector having a probe positioned within a sheath and insulated therefrom by a seal so that the tip of the probe extends proximate to but not below the lower end of the sheath, the lower end terminating in a rim that is provided with notches, said lower end being tapered, the taper and notches preventing debris collection and bubble formation, said lower end when contacting liquid as it rises will form an airtight cavity defined by the liquid, the interior sheath wall, and the seal, the compression of air in the cavity preventing liquid from further entry into the sheath and contact with the seal. As a result, the liquid cannot deposit a film to form an electrical bridge across the seal.

Tshishiku, Eugene M. (Augusta, GA)

2011-08-09T23:59:59.000Z

473

Heterogeneous ice nucleation and water uptake by field-collected atmospheric particles below 273 K  

Science Conference Proceedings (OSTI)

Atmospheric ice formation induced by particles with complex chemical and physical properties through heterogeneous nucleation is not well understood. Heterogeneous ice nucleation and water uptake by ambient particles collected from urban environments in Los Angeles and Mexico City are presented. Using a vapour controlled cooling system equipped with an optical microscopy, the range of onset conditions for ice nucleation and water uptake by the collected particles was determined as a function of temperature (200{273 K) and relative humidity with respect to ice (RHice) up to water saturation. Three distinctly different types of authentic atmospheric particles were investigated including soot particles associated with organics/inorganics, inorganic particles of marine origin coated with organic material, and Pb/Zn containing inorganic particles apportioned to anthropogenic emissions relevant to waste incineration. Single particle characterization was provided by micro-spectroscopic analyses using computer controlled scanning electron microscopy with energy dispersive analysis of X-rays (CCSEM/EDX) and scanning transmission X-ray microscopy with near edge X-ray absorption ne structure spectroscopy (STXM/NEXAFS). Above 230 K, signicant differences in water uptake and immersion freezing effciencies of the different particle types were observed. Below 230 K, the particles exhibited high deposition ice nucleation effciencies and formed ice at RHice values well below homogeneous ice nucleation limits. The data show that the chemical composition of these eld{collected particles plays an important role in determining water uptake and immersion freezing. Heterogeneous ice nucleation rate coeffcients, cumulative ice nuclei (IN) spectrum, and IN activated fraction for deposition ice nucleation are derived. The presented ice nucleation data demonstrate that anthropogenic and marine particles comprising of various chemical and physical properties exhibit distinctly different ice nucleation effciencies and can serve as effcient IN at atmospheric conditions typical for cirrus and mixed phase clouds. This indicates a potential link between human activities and cloud formation, and thus climate.

Wang, Bingbing; Laskin, Alexander; Roedel, Tobias R.; Gilles, Marry K.; Moffet, Ryan C.; Tivanski, Alexei V.; Knopf, Daniel A.

2012-09-25T23:59:59.000Z

474

Stick-Slip Sliding of Water Drops on Chemically Heterogeneous Surfaces  

E-Print Network (OSTI)

We present a comprehensive study of water drops sliding down chemically heterogeneous surfaces formed by a periodic pattern of alternating hydrophobic and hydrophilic stripes. Drops are found to undergo a stick-slip motion whose average speed is an order of magnitude smaller than that measured on a homogeneous surface having the same static contact angle. This motion is the result of the periodic deformations of the drop interface when crossing the stripes. Numerical simulations confirm this view and are used to elucidate the principles underlying the experimental observations.

Silvia Varagnolo; Davide Ferraro; Paolo Fantinel; Matteo Pierno; Giampaolo Mistura; Giorgio Amati; Luca Biferale; Mauro Sbragaglia

2013-05-06T23:59:59.000Z

475

Quartile and Outlier Detection on Heterogeneous Clusters Using Distributed Radix Sort.  

Science Conference Proceedings (OSTI)

In the past few years, performance improvements in CPUs and memory technologies have outpaced those of storage systems. When extrapolated to the exascale, this trend places strict limits on the amount of data that can be written to disk for full analysis, resulting in an increased reliance on characterizing in-memory data. Many of these characterizations are simple, but require sorted data. This paper explores an example of this type of characterization - the identification of quartiles and statistical outliers - and presents a performance analysis of a distributed heterogeneous radix sort as well as an assessment of current architectural bottlenecks.

Spafford, Kyle L [ORNL; Meredith, Jeremy S [ORNL; Vetter, Jeffrey S [ORNL

2011-01-01T23:59:59.000Z

476

High pressure heterogeneous catalysis in a low pressure ultrahigh vacuum environment  

DOE Green Energy (OSTI)

An apparatus was been developed which couples high resolution electron energy loss spectroscopy with molecular beam and scattering techniques. Exposure of Ni(111) to atomic H results in H embedded within the Ni lattice and a monolayer of H adsorbed on the surface. This surface-bound H was removed by an Xe atom beam. Subsequent exposure to CH[sub 4] results in dissociative adsorption, producing adsorbed CH[sub 3] and adsorbed H. Results documents a new mechanism for a surface reaction, a reaction between an adsorbed and a bulk species, and demonstrates the importance of bulk H as a reactant in a heterogeneous catalytic reaction.

Ceyer, S.T.

1992-01-01T23:59:59.000Z

477

Heterogeneous catalyst for the production of ethylidene diacetate from acetic anhydride  

DOE Patents (OSTI)

This invention relates to a process for producing ethylidene diacetate by the reaction of acetic anhydride, acetic acid, hydrogen and carbon monoxide at elevated temperatures and pressures in the presence of an alkyl halide and a heterogeneous, bifunctional catalyst that is stable to hydrogenation and comprises an insoluble polymer having pendant quaternized heteroatoms, some of which heteroatoms are ionically bonded to anionic Group VIII metal complexes, the remainder of the heteroatoms being bonded to iodide. In contrast to prior art processes, no accelerator (promoter) is necessary to achieve the catalytic reaction and the products are easily separated from the catalyst by filtration. The catalyst can be recycled without loss in activity.

Ramprasad, D.; Waller, F.J.

1998-06-16T23:59:59.000Z

478

Heterogeneous catalyst for the production of ethylidene diacetate from acetic anhydride  

DOE Patents (OSTI)

This invention relates to a process for producing ethylidene diacetate by the reaction of acetic anhydride, acetic acid, hydrogen and carbon monoxide at elevated temperatures and pressures in the presence of an alkyl halide and a heterogeneous, bifunctional catalyst that is stable to hydrogenation and comprises an insoluble polymer having pendant quaternized heteroatoms, some of which heteroatoms are ionically bonded to anionic Group VIII metal complexes, the remainder of the heteroatoms being bonded to iodide. In contrast to prior art processes, no accelerator (promoter) is necessary to achieve the catalytic reaction and the products are easily separated from the catalyst by filtration. The catalyst can be recycled without loss in activity.

Ramprasad, Dorai (Allentown, PA); Waller, Francis Joseph (Allentown, PA)

1998-01-01T23:59:59.000Z

479

Heterogeneous catalytic process for alcohol fuels from syngas. Fifteenth quarterly technical progress report, July--September 1995  

DOE Green Energy (OSTI)

The principal objectives of this project are to discover and evaluate novel heterogeneous catalysts for conversion of syngas to oxygenates having use as fuel enhancers, to explore novel reactor and process concepts applicable in this process, and to develop the best total process for converting syngas to liquid fuels. The previous best catalysts consisted of potassium-promoted Pd on a Zn/Cr spinel oxide prepared via controlled pH precipitation. The authors have now examined the effect of cesium addition to the Zn/Cr spinel oxide support. Surprisingly, cesium levels required for optimum performance are similar to those for potassium on a wt% basis. The addition of 3 wt% cesium gives isobutanol rates > 170 g/kg-hr at 440 C and 1,500 psi with selectivity to total alcohols of 77% and with a methanol/isobutanol mole ratio of 1.4: this performance is as good as their best Pd/K catalyst. The addition of both cesium and palladium to a Zn/Cr spinel oxide support gives further performance improvements. The 5 wt% cesium, 5.9 wt% Pd formulation gives isobutanol rates > 150 g/kg-hr at 440 C and only 1,000 psi with a selectivity to total alcohols of 88% and with a methanol/isobutanol mole ratio of 0.58: this is their best overall performance to date. The addition of both cesium and palladium to a Zn/Cr/Mn spinel oxide support that contains excess Zn has also been examined. This spinel was the support used in the synthesis of 10-DAN-54, the benchmark catalyst. Formulations made on this support show a lower overall total alcohol rate than those using the spinel without Mn present, and require less cesium for optimal performance.

NONE

1995-12-31T23:59:59.000Z

480

Heterogeneous catalytic process for alcohol fuels from syngas. Sixteenth quarterly technical progress report, October--December, 1995  

DOE Green Energy (OSTI)

The principal objectives of this project are to discover and evaluate novel heterogeneous catalysts for conversion of syngas to oxygenates having use as fuel enhancers, to explore novel reactor and process concepts applicable in this process, and to develop the best total process for converting syngas to liquid fuels. Among our previous best catalysts was the family consisting of potassium-promoted Pd on a Zn/Cr spinel oxide prepared via controlled pH precipitation. We have now examined the effect of potassium promotion on (1) a Zn/Cr/O spinel and (2) on ZnO; these two individual components are used together to make our best support. The presence of excess zinc oxide has a beneficial effect on the performance of Zn/Cr spinel oxide catalysts (1) promoted with cesium and (2) promoted with both cesium and palladium. The presence of the excess zinc oxide results in a more active and selective catalyst to total alcohols and increased isobutanol rates, demonstrating the effectiveness of zinc oxide addition to the spinel support. Potassium addition promotes higher alcohol synthesis on a commercial Zn/Cr spinel oxide methanol synthesis catalyst. Incremental potassium levels (1, 3 and 5 wt%) result in an increase in total alcohol selectivity, while isobutanol. rates are maximized at 1 wt% potassium. The commercial catalyst promoted with potassium is slightly less active for isobutanol synthesis and less selective to total alcohols when compared with our spinel formulation promoted with potassium and containing excess ZnO. Surface science studies have shown that the surface of these catalysts is predominately ZnO and alkali. With use, the ZnO is reduced to Zn metal, and Cr migrates to the surface giving increased surface acidity. In addition tends to lower the overall acidity. Hydrogen can be observed on the catalyst surface by surface science studies. Hydrogen on the active catalyst is associated with the palladium.

NONE

1996-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "firm level heterogeneity" 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

TRANSIENT CONTROL LEVEL PHILOSOPHY AND ...  

Science Conference Proceedings (OSTI)

Page 1. TRANSIENT CONTROL LEVEL PHILOSOPHY AND IMPLEMENTATION II. Techniques and Equipment for Making TCL Tests ...

2013-05-17T23:59:59.000Z

482

A minimal model of plasma membrane heterogeneity requires coupling cortical actin to criticality  

E-Print Network (OSTI)

We present a minimal model of plasma membrane heterogeneity that combines criticality with connectivity to cortical cytoskeleton. Our model is motivated by recent observations of micron-sized critical fluctuations in plasma membrane vesicles that are detached from their cortical cytoskeleton. We incorporate criticality using a conserved order parameter Ising model coupled to a simple actin cytoskeleton interacting through point-like pinning sites. Using this minimal model, we recapitulate several experimental observations of plasma membrane raft heterogeneity. Small (r~20nm) and dynamic fluctuations at physiological temperatures arise from criticality. Including connectivity to cortical cytoskeleton disrupts large fluctuations, prevents macroscopic phase separation at low temperatures (T<=22{\\deg}C), and provides a template for long lived fluctuations at physiological temperature (T=37{\\deg}C). Cytoskeleton-stabilized fluctuations produce significant barriers to the diffusion of some membrane components in a manner that is weakly dependent on the number of pinning sites and strongly dependent on criticality. More generally, we demonstrate that critical fluctuations provide a physical mechanism to organize and spatially segregate membrane components by providing channels for interaction over large distances.

Benjamin B. Machta; Stefanos Papanikolaou; James P. Sethna; Sarah L. Veatch

2010-09-10T23:59:59.000Z

483

Effects of Porous Medium Heterogeneity on Vadose Zone Desiccation: Intermediate-scale Laboratory Experiments and Simulations  

Science Conference Proceedings (OSTI)

Soil desiccation (drying), involving water evaporation induced by dry gas injection, is a potentially robust vadose zone remediation process to limit contaminant transport through the vadose zone. A series of four intermediate-scale flow cell experiments was conducted in homogeneous and simple layered heterogeneous porous medium systems to investigate the effects of heterogeneity on desiccation of unsaturated porous media. The permeability ratios of porous medium layers ranged from about five to almost two orders of magnitude. The insulated flow cell was equipped with twenty humidity and temperature sensors and a dual-energy gamma system was used to determine water saturations at various times. The multiphase code STOMP was used to simulate the desiccation process. Results show that injected dry gas flowed predominantly in the higher permeability layer and delayed water removal from the lower permeability material. For the configurations tested, water vapor diffusion from the lower to the higher permeability zone was considerable over the duration of the experiments, resulting in much larger relative humidity values of the outgoing air than based on permeability ratios alone. Acceptable numerical matches with the experimental data were obtained when an extension of the saturation-capillary pressure relation below the residual water saturation was used. The agreements between numerical and experimental results suggest that the correct physics are implemented in the simulator and that the thermal and hydraulic properties of the porous media, flow cell wall and insulation materials were properly represented.

Oostrom, Martinus; Freedman, Vicky L.; Wietsma, Thomas W.; Dane, Jacob H.; Truex, Michael J.

2012-11-01T23:59:59.000Z

484

Improved Efficiency of Miscible C02 Floods and Enhanced Prospects for C02 Flooding Heterogeneous Reservoirs  

SciTech Connect

The PRRC-modified DOE pseudomiscible reservoir simulator MASTER was used to conduct a systematic investigation of CO2 flooding using horizontal wells in conjunction with foam. We evaluated the effects of horizontal well radius, length, and location on oil recovery through our testing. This work is necessary to provide field predictions for the use of foam and/or horizontal wells. A number of coreflood tests were performed to examine the effect of foam on oil recovery in heterogeneous porous media. Two coaxial composite cores were used to simulate layered formation systems. The first, an isolated coaxial composite core, was used to simulate a layered formation system of which the layers were not in communication. The second, in capillary contact, simulated layers in communication. Preliminary results suggest that oil displacement is more efficient when surfactant solution is used with CO2 to form CO2-foam. Results from both systems indicate the potential of using foam for improving oil recovery in heterogeneous porous media. Since injectivity loss is a problem in a number of gas injection projects, a preliminary investigation of injectivity loss in WAG was performed. A number of tests were carried out to investigate injectivity loss, indicating that for a given rock the injectivity loss depends on oil saturation in the core during WAG flooding. Higher loss was found in cores with high in-situ oil saturations. No injectivity loss was observed with the naturally fractured carbonate core.

Boyun (Gordon) Guo; David S. Schechter; Jyun-Syung Tsau; Reid B. Grigg; Shih-Hsien (Eric) Chang

1997-04-06T23:59:59.000Z

485

Unified nuclear core activity map reconstruction using heterogeneous instruments with data assimilation  

E-Print Network (OSTI)

Evaluating the neutronic state of the whole nuclear core is a very important topic that have strong implication for nuclear core management and for security monitoring. The core state is evaluated using measurements. Usually, part of the measurements are used, and only one kind of instruments are taken into account. However, the core state evaluation should be more accurate when more measurements are collected in the core. But using information from heterogeneous sources is at glance a difficult task. This difficulty can be overcome by Data Assimilation techniques. Such a method allows to combine in a coherent framework the information coming from model and the one coming from various type of observations. Beyond the inner advantage to use heterogeneous instruments, this leads to obtain a significant increasing of the quality of neutronic global state reconstruction with respect to individual use of measures. In order to present this approach, we will introduce here the basic principles of data assimilation focusing on BLUE (Best Unbiased Linear Estimation). Then we will present the configuration of the method within the nuclear core problematic. Finally, we will present the results obtained on nuclear measurement coming from various instruments.

Bertrand Bouriquet; Jean-Philippe Argaud; Patrick Erhard; Angélique Ponçot

2011-08-30T23:59:59.000Z

486

Flexible CoScheduling : mitigating load imbalance and improving utilization of heterogeneous resources  

Science Conference Proceedings (OSTI)

Fine-grained parallel applications require all their processes to run simultaneously on distinct processors to achieve good efficiency. This is typically accomplished by space slicing, wherein nodes are dedicated for the duration of the run, or by gang scheduling, wherein time slicing is coordinated across processors. Both schemes suffer from fragmentation, where processors are left idle because jobs cannot be packed with perfect efficiency. Obviously, this leads to reduced utilization and sub-optimal performance. Flexible coscheduling (FCS) solves this problem by monitoring each job's granularity and communication activity, and using gang scheduling only for those jobs that require it. Processes from other jobs, which can be scheduled without any constraints, are used as filler to reduce fragmentation. In addition, inefficiencies due to load imbalance and hardware heterogeneity are also reduced because the classification is done on a per-process basis. FCS has been fully implemented as part of the STORM resource manager, and shown to be competitive with gang scheduling and implicit coscheduling. Keywords: Cluster computing, load balancing, job scheduling, gang scheduling, parallel architectures, heterogeneous clusters, STORM

Frachtenberg, E. (Eitan); Feitelson, Dror G.; Petrini, F. (Fabrizio); Fernández, J. C. (Juan C.)

2002-01-01T23:59:59.000Z

487

Quasi-heterogeneous efficient 3-D discrete ordinates CANDU calculations using Attila  

SciTech Connect

In this paper, 3-D quasi-heterogeneous large scale parallel Attila calculations of a generic CANDU test problem consisting of 42 complete fuel channels and a perpendicular to fuel reactivity device are presented. The solution method is that of discrete ordinates SN and the computational model is quasi-heterogeneous, i.e. fuel bundle is partially homogenized into five homogeneous rings consistently with the DRAGON code model used by the industry for the incremental cross-section generation. In calculations, the HELIOS-generated 45 macroscopic cross-sections library was used. This approach to CANDU calculations has the following advantages: 1) it allows detailed bundle (and eventually channel) power calculations for each fuel ring in a bundle, 2) it allows the exact reactivity device representation for its precise reactivity worth calculation, and 3) it eliminates the need for incremental cross-sections. Our results are compared to the reference Monte Carlo MCNP solution. In addition, the Attila SN method performance in CANDU calculations characterized by significant up scattering is discussed. (authors)

Preeti, T. [Univ. of Ontario, Inst. of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4 (Canada); Rulko, R. [Canadian Nuclear Safety Commission, 280 Slater Street, Ottawa, ON K1P 5S9 (Canada)

2012-07-01T23:59:59.000Z

488

Optimized approach to decision fusion of heterogeneous data for breast cancer diagnosis  

Science Conference Proceedings (OSTI)

As more diagnostic testing options become available to physicians, it becomes more difficult to combine various types of medical information together in order to optimize the overall diagnosis. To improve diagnostic performance, here we introduce an approach to optimize a decision-fusion technique to combine heterogeneous information, such as from different modalities, feature categories, or institutions. For classifier comparison we used two performance metrics: The receiving operator characteristic (ROC) area under the curve [area under the ROC curve (AUC)] and the normalized partial area under the curve (pAUC). This study used four classifiers: Linear discriminant analysis (LDA), artificial neural network (ANN), and two variants of our decision-fusion technique, AUC-optimized (DF-A) and pAUC-optimized (DF-P) decision fusion. We applied each of these classifiers with 100-fold cross-validation to two heterogeneous breast cancer data sets: One of mass lesion features and a much more challenging one of microcalcification lesion features. For the calcification data set, DF-A outperformed the other classifiers in terms of AUC (p0.10), the DF-P did significantly improve specificity versus the LDA at both 98% and 100% sensitivity (plearning techniques when applied to two different breast cancer data sets.

Jesneck, Jonathan L.; Nolte, Loren W.; Baker, Jay A.; Floyd, Carey E.; Lo, Joseph Y. [Department of Biomedical Engineering, Duke University, Durham, North Carolina 27705 and Duke Advanced Imaging Labs, Duke University, Durham, NC 27705 (United States); Department of Biomedical Engineering, Duke University, Durham, North Carolina 27705 and Department of Electrical and Computer Engineering, Duke University, Durham, NC 27705 (United States); Duke Advanced Imaging Labs, Department of Radiology, Duke University, Durham, North Carolina 27705 (United States); Department of Biomedical Engineering, Duke University, Durham, North Carolina 27705 and Duke Advanced Imaging Labs, Duke University, Durham, NC 27705 and Medical Physics Graduate Program, Duke University, Durham, NC 27705 (United States)

2006-08-15T23:59:59.000Z

489

Homogeneous and Heterogeneous Reaction and Transformation of Hg and Trace Metals in Combustion Systems  

SciTech Connect

The overall goal of this project was to produce a working dynamic model to predict the transformation and partitioning of trace metals resulting from combustion of a broad range of fuels. The information provided from this model will be instrumental in efforts to identify fuels and conditions that can be varied to reduce metal emissions. Through the course of this project, it was determined that mercury (Hg) and arsenic (As) would be the focus of the experimental investigation. Experiments were therefore conducted to examine homogeneous and heterogeneous mercury oxidation pathways, and to assess potential interactions between arsenic and calcium. As described in this report, results indicated that the role of SO{sub 2} on Hg oxidation was complex and depended upon overall gas phase chemistry, that iron oxide (hematite) particles contributed directly to heterogeneous Hg oxidation, and that As-Ca interactions occurred through both gas-solid and within-char reaction pathways. Modeling based on this study indicated that, depending upon coal type and fly ash particle size, vaporization-condensation, vaporization-surface reaction, and As-CaO in-char reaction all play a role in arsenic transformations under combustion conditions.

J. Helble; Clara Smith; David Miller

2009-08-31T23:59:59.000Z

490

Heterogeneous Reduction of U6+ by Structural Fe2+ From Theory and Experiment  

SciTech Connect

Computational and experimental studies were performed to explore heterogeneous reduction of U6+ by structural Fe2+ at magnetite (Fe3O4) surfaces. Molecular Fe-Fe-U models representing a uranyl species adsorbed in a biatomic bidentate fashion to an iron surface group were constructed. Various possible charge distributions in this model surface complex were evaluated in terms of their relative stabilities and electron exchange rates using ab initio molecular orbital methods. Freshly-cleaved, single crystals of magnetite with different initial Fe2+/Fe3+ ratios were exposed to uranyl-nitrate solution (pH ~ 4) for 90 hours. X ray photoelectron spectroscopy and electron microscopy indicated the presence of a mixed U6+/U5+ precipitate heterogeneously nucleated and grown on stoichiometric magnetite surfaces, but only the presence of sorbed U6+ and no precipitate on sub-stoichiometric magnetite surfaces. Calculated electron transfer rates indicate that sequential multi-electron uranium reduction is not kinetically limited by conductive electron resupply to the adsorption site. Both theory and experiment point to local structural Fe2+ density and sterically accessible uranium coordination environments as key controls on uranium reduction extent and rate. Uranium incorporation in solid phases where its coordination is constrained to the 6-fold uranate type should widen the stability field of U5+ relative to U6+. If uranium cannot acquire 8 fold coordination then reduction may proceed to U5+ but not necessarily U4+.

Skomurski, Frances N.; Ilton, Eugene S.; Engelhard, Mark H.; Arey, Bruce W.; Rosso, Kevin M.

2011-11-15T23:59:59.000Z

491

Comparison of NDA and DA measurement techniques for excess plutonium powders at the Hanford Site: Statistical design and heterogeneity testing  

SciTech Connect

Quantitative physical measurements are a n component of the International Atomic Energy Agency (IAEA) nuclear material m&guards verification regime. In December 1994, LA.FA safeguards were initiated on an inventory of excess plutonium powder items at the Plutonium Finishing Plant, Vault 3, on the US Department of Energy`s Hanford Site. The material originl from the US nuclear weapons complex. The diversity of the chemical form and the heterogenous physical form of this inventory were anticipated to challenge the precision and accuracy of quantitative destructive analytical techniques. A sampling design was used to estimate the degree of heterogeneity of the plutonium content of a variety of inventory items. Plutonium concentration, the item net weight, and the {sup 240}Pu content were among the variables considered in the design. Samples were obtained from randomly selected location within each item. Each sample was divided into aliquots and analyzed chemically. Operator measurements by calorimetry and IAEA measurements by coincident neutron nondestructive analysis also were performed for the initial physical inventory verification materials and similar items not yet under IAEA safeguards. The heterogeneity testing has confirmed that part of the material is indeed significantly heterogeneous; this means that precautionary measures must be taken to obtain representative samples for destructive analysis. In addition, the sampling variability due to material heterogeneity was found to be comparable with, or greater than, the variability of the operator`s calorimetric measurements.

Welsh, T.L.; McRae, L.P.; Delegard, C.H. [Westinghouse Hanford Co., Richland, WA (United States); Liebetrau, A.M. [Pacific Northwest Lab., Richland, WA (United States); Johnson, W.C. [USDOE Richland Operations Office, WA (United States); Theis, W.; Lemaire, R.J. [International Atomic Energy Agency, Vienna (Austria); Xiao, J. [International Atomic Energy Agency, Toronto, Ontario (Canada)

1995-06-01T23:59:59.000Z

492

Model Calibration, Drainage Volume Calculation and Optimization in Heterogeneous Fractured Reservoirs  

E-Print Network (OSTI)

We propose a rigorous approach for well drainage volume calculations in gas reservoirs based on the flux field derived from dual porosity finite-difference simulation and demonstrate its application to optimize well placement. Our approach relies on a high frequency asymptotic solution of the diffusivity equation and emulates the propagation of a 'pressure front' in the reservoir along gas streamlines. The proposed approach is a generalization of the radius of drainage concept in well test analysis (Lee 1982), which allows us not only to compute rigorously the well drainage volumes as a function of time but also to examine the potential impact of infill wells on the drainage volumes of existing producers. Using these results, we present a systematic approach to optimize well placement to maximize the Estimated Ultimate Recovery. A history matching algorithm is proposed that sequentially calibrates reservoir parameters from the global-to-local scale considering parameter uncertainty and the resolution of the data. Parameter updates are constrained to the prior geologic heterogeneity and performed parsimoniously to the smallest spatial scales at which they can be resolved by the available data. In the first step of the workflow, Genetic Algorithm is used to assess the uncertainty in global parameters that influence field-scale flow behavior, specifically reservoir energy. To identify the reservoir volume over which each regional multiplier is applied, we have developed a novel approach to heterogeneity segmentation from spectral clustering theory. The proposed clustering can capture main feature of prior model by using second eigenvector of graph affinity matrix. In the second stage of the workflow, we parameterize the high-resolution heterogeneity in the spectral domain using the Grid Connectivity based Transform to severely compress the dimension of the calibration parameter set. The GCT implicitly imposes geological continuity and promotes minimal changes to each prior model in the ensemble during the calibration process. The field scale utility of the workflow is then demonstrated with the calibration of a model characterizing a structurally complex and highly fractured reservoir.

Kang, Suk Sang 1975-

2012-12-01T23:59:59.000Z

493

DOE SBIR Phase II Final Report: Distributed Relevance Ranking in Heterogeneous Document Collections  

SciTech Connect

This report contains the comprehensive summary of the work performed on the SBIR Phase II project (“Distributed Relevance Ranking in Heterogeneous Document Collections”) at Deep Web Technologies (http://www.deepwebtech.com). We have successfully completed all of the tasks defined in our SBIR Proposal work plan (See Table 1 - Phase II Tasks Status). The project was completed on schedule and we have successfully deployed an initial production release of the software architecture at DOE-OSTI for the Science.gov Alliance's search portal (http://www.science.gov). We have implemented a set of grid services that supports the extraction, filtering, aggregation, and presentation of search results from numerous heterogeneous document collections. Illustration 3 depicts the services required to perform QuickRank™ filtering of content as defined in our architecture documentation. Functionality that has been implemented is indicated by the services highlighted in green. We have successfully tested our implementation in a multi-node grid deployment both within the Deep Web Technologies offices, and in a heterogeneous geographically distributed grid environment. We have performed a series of load tests in which we successfully simulated 100 concurrent users submitting search requests to the system. This testing was performed on deployments of one, two, and three node grids with services distributed in a number of different configurations. The preliminary results from these tests indicate that our architecture will scale well across multi-node grid deployments, but more work will be needed, beyond the scope of this project, to perform testing and experimentation to determine scalability and resiliency requirements. We are pleased to report that a production quality version (1.4) of the science.gov Alliance's search portal based on our grid architecture was released in June of 2006. This demonstration portal is currently available at http://science.gov/search30 . The portal allows the user to select from a number of collections grouped by category and enter a query expression (See Illustration 1 - Science.gov 3.0 Search Page). After the user clicks “search” a results page is displayed that provides a list of results from the selected collections ordered by relevance based on the query expression the user provided. Our grid based solution to deep web search and document ranking has already gained attention within DOE, other Government Agencies and a fortune 50 company. We are committed to the continued development of grid based solutions to large scale data access, filtering, and presentation problems within the domain of Information Retrieval and the more general categories of content management, data mining and data analysis.

Abe Lederman

2007-01-08T23:59:59.000Z

494

Influence of heterogeneous ammonium availability on bacterial community structure and the expression of nitrogen fixation and ammonium transporter genes during in situ bioremediation of uranium-contaminated groundwater  

E-Print Network (OSTI)

heterogeneous ammonium availability on bacterial communityThe impact of ammonium availability on microbial communityin response to ammonium availability to ensure an adequate

Mouser, P.J.

2010-01-01T23:59:59.000Z

495

Posters Triggering of Boundary Layer Cumulus Clouds Over a Heterogeneous Surface  

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

5 5 Posters Triggering of Boundary Layer Cumulus Clouds Over a Heterogeneous Surface K. Schrieber, R. Stull, and Q. Zhang Boundary Layer Research Team Department of Atmospheric and Oceanic Science University of Wisconsin Madison, Wisconsin Complex multimodal joint frequency distributions of LCL height versus θ v in surface-layer air over a large heteroge- neous surface area are modeled as the superposition of simpler mono-modal distributions. These simpler distri- butions, which apply to quasi-homogeneous subdomains, are approximated with bivariate distribution models. The shape of each of these modeled distributions depends on variations of the Bowen ratio and heat input forcings. These forcings are a function of the landscape, insolation, surface albedo, cloud-shading, soil moisture, and other

496

Heterogeneous catalyst for the production of acetic anhydride from methyl acetate  

DOE Patents (OSTI)

This invention relates to a process for producing acetic anhydride by the reaction of methyl acetate, carbon monoxide, and hydrogen at elevated temperatures and pressures in the presence of an alkyl halide and a heterogeneous, bifunctional catalyst that contains an insoluble polymer having pendant quaternized phosphine groups, some of which phosphine groups are ionically bonded to anionic Group VIII metal complexes, the remainder of the phosphine groups being bonded to iodide. In contrast to prior art processes, no accelerator (promoter) is necessary to achieve the catalytic reaction and the products are easily separated from the catalyst by filtration. The catalyst can be recycled for consecutive runs without loss in activity. Bifunctional catalysts for use in carbonylating dimethyl ether are also provided.

Ramprasad, Dorai (Allentown, PA); Waller, Francis Joseph (Allentown, PA)

1999-01-01T23:59:59.000Z

497

Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste  

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

502101 502101 (6pp) doi:10.1088/0953-8984/20/50/502101 FAST TRACK COMMUNICATION Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste Y Zhang 1 , M Lagi 1,2 , F Ridi 2 , E Fratini 2 , P Baglioni 2 , E Mamontov 3 and S H Chen 1,4 1 Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 2 Department of Chemistry and CSGI, University of Florence, Sesto Fiorentino, Florence, I-50019, Italy 3 Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA E-mail: sowhsin@mit.edu Received 24 September 2008, in final form 23 October 2008 Published 12 November 2008 Online at stacks.iop.org/JPhysCM/20/502101 Abstract High resolution quasi-elastic neutron scattering is used to investigate the slow dynamics of hydration water confined in calcium silicate hydrate

498

Using Dynamic Quantum Clustering to Analyze Hierarchically Heterogeneous Samples on the Nanoscale  

SciTech Connect

Dynamic Quantum Clustering (DQC) is an unsupervised, high visual data mining technique. DQC was tested as an analysis method for X-ray Absorption Near Edge Structure (XANES) data from the Transmission X-ray Microscopy (TXM) group. The TXM group images hierarchically heterogeneous materials with nanoscale resolution and large field of view. XANES data consists of energy spectra for each pixel of an image. It was determined that DQC successfully identifies structure in data of this type without prior knowledge of the components in the sample. Clusters and sub-clusters clearly reflected features of the spectra that identified chemical component, chemical environment, and density in the image. DQC can also be used in conjunction with the established data analysis technique, which does require knowledge of components present.

Hume, Allison; /Princeton U. /SLAC

2012-09-07T23:59:59.000Z

499

Metal-surface reaction energetics. Theory and application to heterogeneous catalysis, chemisorption, and surface diffusion  

SciTech Connect

The title is esoteric. The subtitle is specialized. This is an edited book containing five chapters written by eight authors. It is not a book to read from beginning to end, but kept perusing this handsomely printed and well-edited volume, learned so much that he wishes to convey his message to a small but very successful group of chemists and chemical engineers in heterogeneous catalysis: there is a lot to learn in this book, not so much in theory but in the facts that the theorists who wrote the book are trying to explain today with the faint hope that tomorrow they will actually predict new chemistry in as yet unknown catalyti