Computation of two-dimensional turbulent flow at subsonic Mach numbers over thick trailing edges

An implicit time marching finite difference method is used to predict two dimensional turbulent flow at a Reynolds number of 440,000 and a Mach number of 0.574 over a shortened NACA 0012 airfoil with a trailing edge of 4.5% thickness and semicircular shape. The flow is found to be unsteady but periodic in the trailing edge region. Thus, lift and drag fluctuate at small amplitudes around mean values and at distinct frequencies

Reviewing Excess Liquidity Measures - A Comparison for Asset Markets

The conduct of US monetary policy is often accompanied by controversial debates on the adequacy of monetary conditions. These can result from different concepts of excess liquidity measures. The paper analyzes the theoretical and empirical information content of these concepts for asset markets. The analysis classifies, reviews and assesses measures of monetary conditions. For those that qualify as excess liquidity measures, the analysis continues with a comparison of the sources of imbalances and a discussion of the adequacy for asset markets. The theoretical results are cross-checked with empirical evidence. All excess liquidity measures are estimated and compared in the light of recent US asset bubbles. The analysis draws the following main conclusions. Firstly, not all measures of monetary conditions qualify as excess liquidity measure. Secondly, the increasing relevance of asset markets leads to growing distortions of excess liquidity measures. Thirdly, the choice of excess liquidity measure has influence on the assessment of monetary conditions in asset markets.monetary overhang, real money gap, nominal money gap, credit ratios, leverage ratios, price gap, natural interest rate gap, Taylor gap

Translation-based Constraint Answer Set Solving

We solve constraint satisfaction problems through translation to answer set programming (ASP). Our reformulations have the property that unit-propagation in the ASP solver achieves well defined local consistency properties like arc, bound and range consistency. Experiments demonstrate the computational value of this approach.Comment: Self-archived version for IJCAI'11 Best Paper Track submissio

Eccentricity fluctuations from the Color Glass Condensate at RHIC and LHC

In this brief note, we determine the fluctuations of the initial eccentricity in heavy-ion collisions caused by fluctuations of the nucleon configurations. This is done via a Monte-Carlo implementation of a Color Glass Condensate $k_t$-factorization approach. The eccentricity fluctuations are found to nearly saturate elliptic flow fluctuations measured recently at RHIC. Extrapolations to LHC energies are shown.Comment: 2 pages, 2 figure

Promoting innovative stormwater solutions for coastal plain communities

In 2008, the Center for Watershed Protection (CWP) surveyed seventy-three coastal plain communities to determine their current practices and need for watershed planning and low impact development (LID). The survey found that communities had varying watershed planning effectiveness and need better stormwater management, land use planning, and watershed management communication. While technical capacity is improving, stormwater programs are under staffed and innovative site designs may be prohibited under current regulations. In addition, the unique site constraints (e.g., sandy soils, low relief, tidal influence, vulnerability to coastal hazards, etc.) and lack of local examples are common LID obstacles along the coast (Vandiver and Hernandez, 2009). LID stormwater practices are an innovative approach to stormwater management that provide an alternative to structural stormwater practices, reduce runoff, and maintain or restores hydrology. The term LID is typically used to refer to the systematic application of small, distributed practices that replicate pre-development hydrologic functions. Examples of LID practices include: downspout disconnection, rain gardens, bioretention areas, dry wells, and vegetated filter strips. In coastal communities, LID practices have not yet become widely accepted or applied. The geographic focus for the project is the Atlantic and Gulf coastal plain province which includes nearly 250,000 square miles in portions of fifteen states from New Jersey to Texas (Figure 1). This project builds on CWP’s “Coastal Plain Watershed Network: Adapting, Testing, and Transferring Effective Tools to Protect Coastal Plain Watersheds” that developed a coastal land cover model, conducted a coastal plain community needs survey (results are online here: http://www.cwp.org/#survey), created a coastal watershed Network, and adapted the 8 Tools for Watershed Protection Framework for coastal areas. (PDF contains 4 pages

Measuring Monetary Conditions in US Asset Markets - A Market Specific Approach

We analyze monetary conditions in US asset markets — corporate equity, real estate, Treasury bond and corporate & foreign bond — from a market specific perspective, proposing the concept of market leverage. Market leverage measures the average leverage of all asset holders in a particular asset market. The concept builds on an accounting based network that links balance sheet leverages of asset holders to their corresponding shares of ownership. Our empirical analysis yields the following results. Firstly, market specific monetary conditions can differ considerably among asset markets. Secondly, market specific monetary conditions are positively related to asset prices. Thirdly, US asset markets have experienced a loosening in market specific monetary conditions in the last decades. Fourthly, the loosening of market specific monetary conditions explains long-term increases in US asset prices. Fifthly, the recent convergence of market specific monetary conditions of real asset markets towards those of financial asset markets implies a rise in upside risk to future US asset price inflation.market leverage; monetary conditions; asset prices