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Selected Abstracts

Preferential Interface Nucleation: An Expansion of the VLS Growth Mechanism for Nanowires

ADVANCED MATERIALS, Issue 2 2009
Brent A. Wacaser
Abstract A review and expansion of the fundamental processes of the vapor,liquid,solid (VLS) growth mechanism for nanowires is presented. Although the focus is on nanowires, most of the concepts may be applicable to whiskers, nanotubes, and other unidirectional growth. Important concepts in the VLS mechanism such as preferred deposition, supersaturation, and nucleation are examined. Nanowire growth is feasible using a wide range of apparatuses, material systems, and growth conditions. For nanowire growth the unidirectional growth rate must be much higher than growth rates of other surfaces and interfaces. It is concluded that a general, system independent mechanism should describe why nanowires grow faster than the surrounding surfaces. This mechanism is based on preferential nucleation at the interface between a mediating material called the collector and a crystalline solid. The growth conditions used mean the probability of nucleation is low on most of the surfaces and interfaces. Nucleation at the collector-crystal interface is however different and of special significance is the edge of the collector-crystal interface where all three phases meet. Differences in nucleation due to different crystallographic interfaces can occur even in two phase systems. We briefly describe how these differences in nucleation may account for nanowire growth without a collector. Identifying the mechanism of nanowire growth by naming the three phases involved began with the naming of the VLS mechanism. Unfortunately this trend does not emphasize the important concepts of the mechanism and is only relevant to one three phase system. We therefore suggest the generally applicable term preferential interface nucleation as a replacement for these different names focusing on a unifying mechanism in nanowire growth. [source]

What's wrong with business ethics

INTERNATIONAL SOCIAL SCIENCE JOURNAL, Issue 185 2005
David Rodin
The field of business ethics is trapped between two competing and flawed conceptions of corporate responsibility. On the one hand is the shareholder value model, championed by Nobel Prize winning economist Milton Friedman, which claims that corporations owe positive moral obligations only to their shareholders. On the other hand is the normative stakeholder theory, which claims that corporations are morally obliged to secure the interests of a broad range of groups, of which shareholders are only one. In this paper I will argue that if it is to generate a viable account of corporate moral responsibility, business ethics will need to abandon both canonical approaches and adopt a new approach based on a more concrete conception of the business corporation. At the end of the paper I sketch what such a theoretical approach would look like. The argument is not only relevant to business ethics; it also has important consequences for Michael Porter's influential approach to competitive strategy. [source]

The impact of the 1999 CAP reforms on the efficiency of the COP sector in Spain

AGRICULTURAL ECONOMICS, Issue 3 2009
Fatima Lambarraa
Agenda 2000; Distance function; Efficiency; Spanish COP sector Abstract The cereal, oilseeds, and protein crop sector (COP) occupies a prominent position within the European Union's agricultural sector. Within Spain, the COP sector accounts for almost a third of total Agricultural Guidance and Guarantee Fund expenses, and half of the utilized agricultural area (UAA). The COP sector is not only relevant because of its physical and economic magnitude, but also because of the political attention it receives. The Common Agricultural Policy (CAP) reforms that occurred during the 1990s paid special attention to this sector. This article aims to determine the impacts of Agenda 2000 on a sample of Spanish COP farmers' production decisions by using an output-oriented stochastic distance function. The distance function allows for an assessment of the reform-motivated changes on total output, input used, input composition, and crop mix. It also permits an assessment of the impacts of the reform on farms' technical efficiency. Results show that the reform has shifted the production frontier inward and changed output composition in favor of voluntary set-aside land. With respect to input composition, Agenda 2000 induced a decrease in land, fertilizers, pesticides, and other inputs in favor of labor. In addition, Agenda 2000 has had a negative impact on technical efficiency. [source]

Klimapolitik: Kyoto-Protokoll und Emissionshandel für CO2 -Zertifikate in der EU1

PERSPEKTIVEN DER WIRTSCHAFTSPOLITIK, Issue 3 2005
Wolfgang Ströbele
Also every economist knows that the institutional conditions and the rules of the game are important. This basic idea stood behind the introduction of a CO2 -emissions trading system within the European Community starting in 2005. Since the starting point is the Kyoto-protocol with its subset of relevant states involved and the rules agreed upon there, one must ask whether the EU CO2-trading system is really an instrument that helps to reach the Kyoto goals more efficiently. A positive answer to this question is very doubtful. The new European subsystem is only valid for CO2 while Kyoto knows six greenhouse gases, the EU trading periods are 2005,2007 and 2008,2012 while Kyoto is only relevant for the second period, the integration with all flexible instruments of Kyoto is not guaranteed from the beginning. The plants involved are power plants and plants with high energy intensity. Since the technological levels of these plants are rather similar in Europe, the difference in marginal abatement cost will not be large enough to offset the rather high transaction cost of the special EU system. Furthermore, the heating systems and small scale plants of industry are not included in the trading system. The same holds true for traffic, households and the service sector. Drawing a borderline between CO2 -policy there and the trading activities will cause inefficiencies. If CO2 -prices are high, the main incentive of the trading system will be a large shift from domestic production to production abroad without any CO2 -restrictions. Leakage-effects will then be dominant. With low CO2 -prices the special European bureaucratic system will not create enough efficiency gains to cover the trading system's cost. [source]

Molecular systematics and population genetics of biological invasions: towards a better understanding of invasive species management

ANNALS OF APPLIED BIOLOGY, Issue 1 2009
J. Le Roux
Abstract The study of population genetics of invasive species offers opportunities to investigate rapid evolutionary processes at work, and while the ecology of biological invasions has enjoyed extensive attention in the past, the recentness of molecular techniques makes their application in invasion ecology a fairly new approach. Despite this, molecular biology has already proved powerful in inferring aspects not only relevant to the evolutionary biologist but also to those concerned with invasive species management. Here, we review the different molecular markers routinely used in such studies and their application(s) in addressing different questions in invasion ecology. We then review the current literature on molecular genetic studies aimed at improving management and the understanding of invasive species by resolving of taxonomic issues, elucidating geographical sources of invaders, detecting hybridisation and introgression, tracking dispersal and spread and assessing the importance of genetic diversity in invasion success. Finally, we make some suggestions for future research efforts in molecular ecology of biological invasions. [source]