CN – Page 27 – TechConnect Briefs

Preparation of Monodispersed Silica and Composite Spheres

Tang F., Ding J., Chen D., Huang Z., Xia H., Meng X., The Chinese Academy of Sciences, CN

Nanoscale crystallites of metals or semiconductors, exhibiting unusual size-dependent electronic, magnetic, optical, and catalytic properties due to the onset of quantum effects, are being heralded as the next-generation building blocks for modern materials design. However, [...]

Effects of Stone-Wales Defect on Adsorption & Insertion Capacity of Nanotubes

Zhou L.G., Meng F.Y., Shi S.Q., Hong Kong Polytechnic University, CN

As more experimental results become available and theoretical investigations get deeper, carbon nanotube (CNT) is found to be not as perfect as it seems. Due to this reason, the presence and roles of defects in [...]

A Neural-Network-Based-Method on Speed Control of Ultrasonic Motors

Liang Y.C., Shi X.H., Lee H.P., Lee K.H., Lin W.Z., Xu X., Lim S.P., Lee H.P., Lee K.H., Jilin University, CN

An improved Elman network models, output-input feedback (OIF) Elman networks is proposed based on the modified Elman network. A neural-network-based iteration control system (NNICS)) is developed by using the OIF Elman network as a passageway [...]

Monte Carlo Modeling of Micro-Scale Gas Flows

Fan J., Shen C., Chinese Academy of Sciences, CN

In the past few years, an information preservation (IP) method [1-6] has emerged as a numerical technique to analyze subsonic, micro-scale gas flows. In this method, simulated molecules move through physical space and undergo collisions [...]

Theory of Spin Transport in an n-typed GaAs Quantum Well

Wu M.W., Weng M.Q., Univ. of Science & Technology of China, CN

We perform a many-body investigation of the spin diffusion/transport in an n-doped GaAs QW based on a set of many-body kinetic transport equations. These equations are derived for the spatial inhomogeneous system by using nonequilibrium [...]

Transition of the Ground State in a Coupled N-layer Quantum Dot

Xie W., Guangzhou University, CN

There has been growing interest in the physics of quantum dots (QDs) in recent years because of the rapid development of fabrication technology. Most theoretical and experimental studies have been so far focused on the [...]

Fabrication of High Quality PZT Thick Film Using Lift-Off Technique

Zhao H.J., Ren T.L., Liu J.S., Liu L.T., Liu J.S., Liu L.T., Li Z.J., Liu J.S., Liu L.T., Institute of Microelectronics, Tsinghua University, CN

Lead-zirconate-titanate (PZT) is a typical ferroelectrical material with outstanding properties. The demand for the thickness of PZT films used in MEMS is usually over 1_m due to the advantages of the thick thin films, so [...]

A Novel Structure for PZT-Based Piezoelectric Microphone

Zhao H.J., Ren T.L., Liu J.S., Liu L.T., Liu J.S., Liu L.T., Li Z.J., Liu J.S., Liu L.T., Tsinghua University, CN

Microphone is one of the most challenging and developing areas and markets in the field of microsensor technology. Piezoelectric microphones have the advantages of simple fabrication process and easy to be integrated into semiconductor devices [...]

Monte Carlo Modeling of Micro-Scale Gas Flows

Fan J., Shen C., Chinese Academy of Sciences, CN

In the past few years, an information preservation (IP) method [1-6] has emerged as a numerical technique to analyze subsonic, micro-scale gas flows. In this method, simulated molecules move through physical space and undergo collisions [...]

Binding Energy of an Exciton Bound to a Charged Impurity in Quantum Dots

Xie W., Guangzhou University, CN

Binding energies for an exciton (X) trapped in the two-dimensional quantum dot by a charged impurity located on the z axis at a distance from the dot plane are calculated using the method of few-body [...]