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2002

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Articles 3451 - 3455 of 3455

Full-Text Articles in Physical Sciences and Mathematics

An Experimental Study Of Grain Scale Melt Segregation Mechanisms In Two Common Crustal Rock Types, Caleb W. Holyoke Iii, Tracy Rushmer Dec 2001

An Experimental Study Of Grain Scale Melt Segregation Mechanisms In Two Common Crustal Rock Types, Caleb W. Holyoke Iii, Tracy Rushmer

Caleb Holyoke

No abstract provided.

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Forecasting Volatility In European Stock Markets With Non-Linear Garch Models, Giancarlo Forte, Matteo Manera Dec 2001

Forecasting Volatility In European Stock Markets With Non-Linear Garch Models, Giancarlo Forte, Matteo Manera

Matteo Manera

This paper investigates the forecasting performance of three popular variants of the nonlinear GARCH models, namely VS-GARCH, GJR-GARCH and Q-GARCH, with the symmetric GARCH(1,1) model as a benchmark. The application involves ten European stock price indexes. Forecasts produced by each non-linear GARCH model and each index are evaluated using a common set of classical criteria, as well as forecast combination techniques with constant and non-constant weights. With respect to the standard GARCH specification, the non-linear models generally lead to better forecasts in terms of both smaller forecast errors and lower biases. In-sample forecast combination regressions are better than those from …

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Sustainable Development: Now More Than Ever, John C. Dernbach Dec 2001

Sustainable Development: Now More Than Ever, John C. Dernbach

John C. Dernbach

This Article explains how and why sustainable development emerged as a conceptual framework, the basic concepts or principles on which this framework is based, why sustainability is primarily a matter for domestic national governance, and why the United States needs to play a leading role in fostering sustainable development. Because "sustainable" modifies "development," it is first important to understand what development means. Since the end of World War II, development has included at least four related elements: peace and security, economic development, social development, and supportive national governance. Each element is reflected in major multilateral treaties that provide a common …

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Synthesis And Physico-Chemical Investigations On 16 And 18 Membered [N4] Macrocycles Modified With Appropriate Carbonyl Functions - A Closer Mimic To A Synthetic Cyclic Tetrapeptide; Isolation Of Stable Encapsulated Derivatives With Zn(Ii),Cd(Ii) And Hg(Ii) Ions, Z. A. Siddiqi, V. J. Mathew, Mohammad Mansoob Khan Dr Dec 2001

Synthesis And Physico-Chemical Investigations On 16 And 18 Membered [N4] Macrocycles Modified With Appropriate Carbonyl Functions - A Closer Mimic To A Synthetic Cyclic Tetrapeptide; Isolation Of Stable Encapsulated Derivatives With Zn(Ii),Cd(Ii) And Hg(Ii) Ions, Z. A. Siddiqi, V. J. Mathew, Mohammad Mansoob Khan Dr

Dr. Mohammad Mansoob Khan

Reaction of 1, 2-diamine or 1,3-diamine with succinic/ phthalic anhydride in 1:1 molar ratio at RT in dioxane results in 16-membered or 18 membered macrocycle which posseses tetraamide/ tetrapeptide functions in the molecular unit which however, exhibit ample reactivity towards metallic substrates affording stable compounds with [MLX2 ] (M=Zn,Cd or Hg; X = CI, SCN or CI04 ) stoichiometry as evidenced from the physico-chemical investigations which confirm that the macrocyclic moieties (L| - L6 ) have the appropriate cavity sizes to encapsulate Zn(II), Cd (II) or Hg(II) ions via coordination through nitrogens of the amide/ peptide functions in tetradentate fashion …

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Candidate Set Strategies For Ant Colony Optimisation, Marcus Randall, James Montgomery Dec 2001

Candidate Set Strategies For Ant Colony Optimisation, Marcus Randall, James Montgomery

Marcus Randall

Ant Colony Optimisation based solvers systematically scan the set of possible solution elements before choosing a particular one. Hence, the computational time required for each step of the algorithm can be large. One way to overcome this is to limit the number of element choices to a sensible subset, or candidate set. This paper describes some novel generic candidate set strategies and tests these on the travelling salesman and car sequencing problems. The results show that the use of candidate sets helps to find competitive solutions to the test problems in a relatively short amount of time.

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