Conductance through a single impurity in the metallic zigzag carbon nanotube

We investigate transport through a single impurity in metallic zigzag carbon nanotube and find the conductance sensitively depends on the impurity strength and the bias voltage. It is rather interesting that interplay between the current-carrying scattering state and evanescent modes leads to rich phenomena including resonant backward scattering, perfect tunneling and charge accumulations. In addition, we also find a dual relation between the backscattered conductance and the charge accumulation. At the end, relevance to the experiments is discussed.Comment: 3 pages, 3 figure

Evaluating Logistics Capabilities on Firm Performance of the Photonics Industry in Taiwan

This study empirically examined the impact of logistics capabilities on firm performance in the photonics industry. Structural equating modelling (SEM) was employed to test the research hypotheses with the use of data collected from a survey of 221 photonics manufacturing firms in Taiwan. Three dimensions were identified based on a factor analysis, including warehousing capability, information technology capability, and transportation capability. The research findings indicated that logistics capabilities positively influence firm performance. Information technology capability was found to be the most important logistics capability in the photonics industry, followed by warehousing capability, and transportation capability. There is also a discussion of the theoretical and managerial implications for the photonics industry

Globalization and Knowledge Spillover: International Direct Investment, Exports and Patents

This paper examines the impact of the three main channels of international trade on domestic innovation, namely outward direct investment, inward direct investment (IDI) and exports. The number of Triadic patents serves as a proxy for innovation. The data set contains 37 countries that are considered to be highly competitive in the world market, covering the period 1994 to 2005. The empirical results show that increased exports and outward direct investment are able to stimulate an increase in patent output. In contrast, IDI exhibits a negative relationship with domestic patents. The paper shows that the impact of IDI on domestic innovation is characterized by two forces, and the positive effect of cross-border mergers and acquisitions by foreigners is less than the negative effect of the remaining IDI.International direct investment; Export; Triadic Patent; Outward Direct Investment; Inward Direct Investment; R&D; negative binomial model