Weighted Indices for Evaluating the Quality of Research with Multiple Authorship

Devising an index to measure the quality of research is a challenging task. In this paper, we propose a set of indices to evaluate the quality of research produced by an author. Our indices utilize a policy that assigns the weights to multiple authors of a paper. We have considered two weight assignment policies: positionally weighted and equally weighted. We propose two classes of weighted indices: weighted h-indices and weighted citation h-cuts. Further, we compare our weighted h-indices with the original h-index for a selected set of authors. As opposed to h-index, our weighted h-indices take into account the weighted contributions of individual authors in multi-authored papers, and may serve as an improvement over h-index. The other class of weighted indices that we call weighted citation h-cuts take into account the number of citations that are in excess of those required to compute the index, and may serve as a supplement to h-index or its variants.Comment: 12 pages, 9 figures, 4 table

Demand for M2 in Developing Countries: An Empirical Panel Investigation

A significant body of literature on developed countries support the view that disequilibrium in the money market can affect the future output gap and/or inflation. This paper examines the major determinants of the demand for real money balances in eight developing countries for which consistent annual time series data are available. Pooling cross-country and time series data for the 1979-1999 periods and employing the seemingly unrelated regression (SUR) estimation technique, this paper models a standard money demand function. Various country-specific coefficients are allowed to capture inter-country heterogeneities. Consistent with theoretical postulates, this paper finds that the demand for money positively responds to an increase in real income and negatively to a rise in the interest rate spread, the rate of inflation and the US long-term interest rate. This study supports the hypothesis that disequilibrium in the money market can exacerbate inflation and widen the output gap.Demand for Money, Money and Interest Rate Spread, Panel Data,

Demand for M2 in Developing Countries: An Empirical Panel Investigation

A significant body of literature on developed countries support the view that disequilibrium in the money market can affect the future output gap and/or inflation. This paper examines the major determinants of the demand for real money balances in eight developing countries for which consistent annual time series data are available. Pooling cross-country and time series data for the 1979-1999 period and employing the seemingly unrelated regression (SUR) estimation technique, this paper models a standard money demand function. Various country-specific coefficients are allowed to capture inter-country heterogeneities. Consistent with theoretical postulates, this paper finds that the demand for money positively responds to an increase in real income and negatively to a rise in the interest rate spread, the rate of inflation and the US long-term interest rate. This study supports the hypothesis that disequilibrium in the money market can exacerbate inflation and widen the output gap.Demand for Money, Money and Interest Rate Spread, Panel Data,

Entropy-based performance analysis of jet engines; Methodology and application to a generic single-spool turbojet

Recently developed methodology that provides the direct assessment of traditional thrust-based performance of aerospace vehicles in terms of entropy generation (i.e., exergy destruction) is modified for stand-alone jet engines. This methodology is applied to a specific single-spool turbojet engine configuration. A generic compressor performance map along with modeled engine component performance characterizations are utilized in order to provide comprehensive traditional engine performance results (engine thrust, mass capture, and RPM), for on and off-design engine operation. Details of exergy losses in engine components, across the entire engine, and in the engine wake are provided and the engine performance losses associated with their losses are discussed. Results are provided across the engine operating envelope as defined by operational ranges of flight Mach number, altitude, and fuel throttle setting. The exergy destruction that occurs in the engine wake is shown to be dominant with respect to other losses, including all exergy losses that occur inside the engine. Specifically, the ratio of the exergy destruction rate in the wake to the exergy destruction rate inside the engine itself ranges from 1 to 2.5 across the operational envelope of the modeled engine --Abstract, page iii

The utilization and loss of available energy in aerospace systems

“Theoretical principles and analytical methodology for the control volume-based energy availability methodology for aerospace vehicles are developed; applications are made to jet-propelled and rocket-propelled vehicles as well as to stand-alone engine systems. Energy availability utilization characteristics of a modeled turbojet engine are studied across a wide range of operating conditions of throttle setting, flight altitude, and flight Mach number. The method is also extended to consider jet-powered vehicles. Fundamental principles regarding entropy generation and energy availability are developed, including directly linking entropy generation and maximum range and endurance of a powered aircraft. Theory and application of the energy utilization methodology with allocation of losses and productive usage are also developed and shown for atmospheric accelerating and climbing (access-to-space) rockets both at specific flight points as well as across missions. Flight conditions required for optimal performance in terms of energy utilization and entropy generation are theoretically derived and verified with applications. Performance impact of entropy generation both in the engine and in the wake on vehicle performance are studied; studies are made for representative rocket systems. In addition, mission-integrated form of the theoretical availability balance formulation has been derived and generalized for an N-stage rocket and cast in both dimensional and non-dimensional forms; theory for special cases and optimization criteria are defined and tested. The primary objective of this work has been to formulate, characterize, and investigate performance of airbreathing and rocket-powered aerospace systems, specifically from the standpoint of energy availability utilization”--Abstract, page iv