The growth of high-quality semiconducting single-wall carbon nanotubes with a narrow band-gap distribution is crucial for the fabrication of high-performance electronic devices. However, the single-wall carbon nanotubes grown from traditional metal catalysts usually have diversified structures and properties. Here we design and prepare an acorn-like, partially carbon-coated cobalt nanoparticle catalyst with a uniform size and structure by the thermal reduction of a [Co(CN)6]3− precursor adsorbed on a self-assembled block copolymer nanodomain. The inner cobalt nanoparticle functions as active catalytic phase for carbon nanotube growth, whereas the outer carbon layer prevents the aggregation of cobalt nanoparticles and ensures a perpendicular growth mode. The grown single-wall carbon nanotubes have a very narrow diameter distribution centred at 1.7 nm and a high semiconducting content of >95%. These semiconducting single-wall carbon nanotubes have a very small band-gap difference of ∼0.08 eV and show excellent thin-film transistor performance.

For achieving high-speed and large-capacity data transmission between two computers, a data exchanging system is designed. With FPGA as the data transmission medium, the exchanging of command and data is implemented through the I2C channel and Slave FIFO channel of USB2.0 chip. The system design includes both hardware and software, which are respectively realized by Verilog HDL and C++. Two computers with USB Host interfaces are connected to the development board by USB2.0 transmission line, and then exchange data directly under the control of upper computer. The simulation results show that the system is practical, reliable and easily extensible.

The metric pump is widely used in the chemical industry and other industries which need fluid translation. It has the ability of accurate flow regulating. However, it is mainly by operating the hand wheel on the pump to regulate the flow of the pump at present. The accuracy of manual regulation is low, and the manual operated metric pump is not suitable to be used in the poisonous and dangerous circumstances. This paper chose AT89S52 as the main controller, which controlled the stepper motor. After reducing the speed by speed reducer, the stepper motor drove leadscrew to control the N-Shape Shaft, which is the flow regulating part on the pump. The system used LCD as the display unit, it can displayed the the setting values, and the values changed as the stepper motor moved. The system used 4×4 keyboard as the input interface, it has more keys which means more control funtions and inputing flow values is convenient. The experimental results indicate that the error between actual flow value and the setting value is within 2%. It reaches the factory demand. This flow regulation instrument has resloved unconvenience in manual regulation way and improved the control accuracy.

In 2002, TC8-01 launched the CIECAM02 color appearance model and determined it as recommendation for industrial applications. In this paper, we review the situation and the latest theoretical research progress about CIECAM02 and discuss the main theoretical issues from three aspects , uniformity, model defects, prediction improvement, finally we analyze its shortcomings and put forward the problem to be solved and some research directions.