Volume 14 Issue 5 - June 18, 2010 PDF
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Articles Digest

Research Express@NCKU Jun. 18 ~ Jun. 24, 2010

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Invisibility cloak with a twin cavity
Tungyang Chen

We study an invisibility cloak with a twin cavity, simulated by a plane algebraic curve- hippopede. The cloaked region, which looks like eight for some sets of geometric parameters, is expanded from one single point.

Scientists found that by enclosing an object by a layer of tailored material, the electromagnetic field can be controlled, bent around an interior region and return to their …

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Scaffolding Student-Generated Questions: Design and Development of a Customizable Online Learning System
Fu-Yun Yu

1. Introduction

Students have traditionally solved teacher-generated questions—questions that teachers think will be of relevance, importance and interest. The call for a shift to allocate some of this responsibility to students, and to diversify the sources of questions that students respond to by allowing students to formulate questions, has been acknowledged by teaching professionals …

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Nitride-Based MSM Photodetectors with a HEMT Structure and a Low-Temperature AlGaN Intermediate Layer
Ricky W. Chuang

AlGaN/GaN high electron mobility transistor (HEMT) is a widely studied structure for applications in high power and high frequency electronic devices. The unique characteristics of AlGaN/GaN heterostructural devices typically involve the current transport via the two-dimensional electron gas (2DEG) and a modulation field applied in a direction parallel with the heterointerface. …

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An electrochemical preparation of a nano-structured cobalt oxide electrode with super redox activity
I-Wen Sun

Pseudocapacitors of which the capacitance is attributed to the continuous reversible faradaic redox reaction of electrode materials are promising energy storage devise.  Cobalt oxide is one of the attractive electrode materials due to its high redox activity and good reversibility.  Among the various approaches for preparation of pseducapacitive Co oxide, electrodeposition offers the advantages of simplicity, …

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