Advanced Materials Research Vol. 646

Abstract: Effects of pulsed electric fields (PEF) treatment on interface properties of phospholipids dispersion were studied. Results showed that the conductivity of solutions with different concentration after PEF treatment increased while surface tension value decreased with increasing electric field strength. The absolute value of zeta potential firstly increased when the field intensity was within 0~20 kV/cm, and then decreased if the field intensity increased further. It can be inferred that the torque of phospholipids molecule may have changed and phospholipids molecule have rearranged after PEF treatment. Moreover, as a resemblance to biological membrane structure, the phospholipid molecules of cell membrane may generate micropores after rearrangement, which result in the cell electroporation.

Abstract: DAC architecture that is designed in this research can be applied in high-speed communication systems. DAC architecture that is presented in this research is based on the R2R ladder method. The design requires three main components, namely switches, resistors, and op-amp. This method has been applied to the 8-bit DAC for high-speed communication system using AMS technology 0.35 μm CMOS process. Resistors that are used in R2R DAC is replaced by transistors, so that the size is smaller and easier layout in the manufacturing process. Mentor graphics software is used as a simulator of the design. DAC design with 8-bit resolution in this research can be applied to the speed up to 1000 Msps. In the way the design can be categorized as high-speed DAC that can be used in a communication system.

Abstract: In memory device that is contained in the digital application, there is a sequence of input buffer.The input buffer’s function is to improve a digital signal and remove noise. The buffer circuit take these input signal with imperfections and convert them in to full digital logic levels by slicing the signals at correct levels which depends upon the switching point voltage. In this paper,using three topologies, that are NMOS, PMOS and Parallel input buffer. It would be present into design, simulation and analysis of all topologies input buffer. The result in this paper to determine the best of the three topologies to used. The delay time used to determine the best of topologies. Mentor graphic is tools which used in this paper to design and simulation. The technology used in this paper is 0.35 µm CMOS Technology. Analysis of comparison all of topologies used in this paper based on six parameters. The result of comparison analysis can be seen in more details in this explanation.

Abstract: This paper discusses on selecting the most appropriate material for developing human-like brain phantom. It aims to investigate the effect of concentration and temperature to relative permittivity of a sample. This phantom was developed as a human-like brain for tumour detection using microwave signal. Result shows that plant gelatine is a stable and appropriate material for building phantom than agar-agar. A few models were developed based on the proposed ratio of mixture.

Abstract: A two-way symmetrical modified Wilkinson power divider with shifted output ports and wide range frequency-ratio is proposed for dual-band application. The symmetrical Wilkinson power divider consists of one section coupled line, one section microstrip line, the shifting of two output ports to the middle, two open stubs at the input port and an isolation resistor. The corresponding nonlinear design equations are derived by using the even- and odd-mode analysis. Moreover, solving the nonlinear design equations by optimization algorithms, accurate numerical design parameters along with different frequency ratios are obtained. Finally, the proposed structure and design method are validated by simulation and experimental results of microstrip planar Wilkinson power divider.

Abstract: This work represents active DNA concentration on piezoresistive microcantilever using biased AC electroosmosis. Two different sizes of DNA molecules, -phage DNA (48.5 kbp) and single-strand DNA of 20 nucleotides are concentrated on separate piezoresistive microcantilever sen- sor for detection. Before concentration, mixing of DNA molecules is performed using the same device for efficient concentration. During concentration of DNA molecules, biased and unbiased AC elec- troosmosis are needed to concentrate single-strand DNA and -phage DNA, respectively. Moreover, dielectrophoresis is induced by biased AC electroosmosis that can generate attractive force to trans- port negatively charged single-strand DNA. This paper represents a device configuration to integrate biased and unbiased AC electroosmosis and dielectrophoresis with piezoresistive microcantilever sen- sors for the detection of -phage DNA and single-strand DNA.

Abstract: This paper presents the application of trajectory tracking using the adaptive neural network to the double chaotic pendulum. The proposed controller structute is composed of a neural identifier and a PD Control. Experimental results with the chaotic pendulun shown the usefulness of the proposed approach. To verify the analytical results, an example of dynamical network is simulated and a theorem is proposed to ensure the tracking of the nonlinear system.

Abstract: In this paper, we have presented the design and characteristic performance evaluation of a 6-order Leapfrog Filter. First we designed the filter by using Silicon-based CMOS Operational Amplifiers (Si-OPAMPs). Then we designed the filter with Carbon Nanotube-based Operational Amplifiers (CNT-OPAMPs) using a benchmark nine-transistor Operational Amplifier (OPAMP) model with single-walled Carbon Nanotube Field-Effect Transistors (SW-CNTFETs) as primary building-blocks for 32nm technology. We compared the performance between the two and achieved higher phase margin, improved power dissipation, and significantly higher input resistance for the CNT-OPAMP based filter. Then we further evaluated the performance of the CNT-OPAMP based filter by changing the number of SWNTs used in the intrinsic channel region of the CNTFET, keeping all other design parameters the same. Our simulation-based assessment has shown a satisfactory superiority for CNT-OPAMP filter design in comparison with Si-based CMOS filter design. The results obtained suggest that the CNT-OPAMP has a promising potential for low-power, high-speed applications in both analog and mixed-signal nanoelectronic circuits.

Abstract: We report the recent results obtained on the magnetoimpedance (MI) response in several near-zero magnetostriction Co-based amorphous ribbons with different width, and different transverse magnetic anisotropy (developed during the fabrication process or processing after production by the current annealing technique) in the frequency range of 10 MHz – 3.5 GHz. The evolution of the maximum of MI with the axial magnetic field, ascribed to the anisotropy field, as a function of the frequency provides useful information on the soft magnetic character of the ribbons.

Abstract: In this paper, we have presented the design and performance evaluation of a 10GHz 32nm-CNTFET IR-UWB transmitter for inter-chip wireless transmission. We have designed the transmitter using a VCO-based high speed clock generator and a positive and a negative monocycle Gaussian pulse generator. RF compatible Carbon Nano-Tube Field Effect Transistors (CNTFETs) have been used as the building blocks of the oscillator and the logic gates. The final design has resulted to a 7-channel-SWNT CNTFET-based transmitter for optimum 10GHz data rate with a promising 650mV pulse amplitude and only 1.069mW power consumption with a -32.27dB output. This transmitter can also operate satisfactorily upto 15GHz. The results show promising superiority over existing transmitters regarding high data rate, low power loss and high pulse amplitude.