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We report on terahertz radiation from topological insulator (TI) Sb2Te3 thin film under ultrafast optical excitation with different helicity. Polarity-reversals of the emitted THz radiation were observed as the helicity of optical pulses reversed. The observed phenomena are coincident with the characteristics of the helicity-dependent photocurrent on TIs. Our work demonstrates the potential applications...
In a traditional cellular network, the base station (BS) plays a critical role in linking devices for communications, but the huge user demand, especially in cities, has become a cost burden to the BS. The technique of device-to-device (D2D) communications underlaying cellular networks solves this problem and adds benefits to resource utilization. Nevertheless, the issue of how to efficiently utilize...
Messages encoded from DNA sequence provide extensional structural and functional information in constructing DNA nanostructures. Therefore, DNA is used more than just as a genetic blueprint of life, it is also as innovative building blocks for building up various innovative nanomaterials with nano-meter resolution and micro-meter scale length. Long, and single-stranded DNA with repetitive sequence...
In this paper, the switching flow-graph (SFG) modeling technique is used to build the large-signal model of a cascaded multilevel inverter. With the concept of virtual switch and virtual switching function proposed in SFG modeling technique, the large-signal SFG model of a cascaded multilevel inverter can be derived easily and without complex mathematic works. The SFG model can also be implemented...
In this paper, two methods of microscopic image analysis were presented to classify the abnormal cells in Papanicolaou(Pap) smear for cervical cancer screening. Our goal is to extract those cell nuclei which are abnormally large size, bizarre shape as well as hyper density and we hope to apply this method to the different kinds of abnormal cells. The global information of the image and the local image...
Three skin whitening assays combining the semiconductor technology was demonstrated for screening the drug candidate and discussing the mechanisms of melanogenesis in medical cosmetics. We proposed a miniaturized photometric system using complementary metal oxide semiconductor (CMOS) phototransistor as a detector with high sensitivity. The CMOS phototransistor was a small, portable optoelectronic...
The programmable self-assembly of molecular nanostructures plays a crucial role in the development of nanodevices for molecule recognition. A self-assembly, periodic ssDNA nanotemplate based on aptameric recognition of tumor marker, PDGF was in situ constructed on the silicon-based substrate. The long, periodic ssDNA nanotemplate was further elongated up to 454 nm through rolling circle amplification...
DNA is a wonderful material for the construction of nanostructures for a variety of applications. This paper describes a novel platform integrating single-stranded DNA (ssDNA) nanotemplates with CMOS-compatible, field-effect sensors. The field-effect sensor was based on oxide-semiconductor field-effect transistors (OSFETs), which were monolithically-integrated with signal-processing circuits to enhance...
A miniature CMOS optoelectronic biosensor is proposed for screening whitening agents. Based on the principle of absorption photometry, this biosensor is mainly composed of a green LED, a CMOS phototransistor, and a slide for performing the biochemical reactions. The requirement of the sample volume is only 10 mul, much less than those in commercial instruments. Melanin assay and MTT assay were performed...
In this report, a CMOS-compatible colorimetric biosensor based on HRP/TMB/streptavidin system is proposed. HRP activity is used for labelled target quantification by photometric detector. The modulation of light intensity due to enzyme reaction can easily be detected in 96 - well microarray plate by providing 650 nm light source (LED). There is good correlation between absorbance in 650 nm and the...
Colorimetric, in situ, isothermal rolling circle amplification (RCA)-based biosensor was developed as a novel, versatile nucleic acid-based amplification machine for platelet-derived growth factor (PDGF) detection. This antibody-free biosensor utilized nucleic acids immobilized on the plate and DNA aptamers to capture the target protein. As compared to the conventional fluorescence measurement [1],...
A low hardware cost low-density parity-check (LDPC) decoder is presented in this paper. Using logical OR operation in the check nodes for the log sum-product algorithm (Log-SPA), we propose a new architecture for updating the check nodes messages. Synthesized and numerical results show that the proposed architecture achieves up to 21% total hardware reduction with fair BER performance when compared...
We present a effective method to enhance the mixing inside the droplets . Mixing efficiency of samples and reagents is a critical step in realizing a lab-on-a-chip. However, mixing of liquids is very difficult in continuous flow microfluidics due to laminar flow conditions. In droplet-based liquid, many papers present some methods to enhance the mixing efficiency. Different input signal will generate...
A droplet-based microfluidic system was developed for biochemical assays of triglycerides and methanol as potential applications in medical rapid diagnostics and food safety. We present a novel platform to manipulate biology reaction droplets with features of self-moving, self-mixing, and self-positioning toward the detection spot. The driving force comes from the gradient of surface tension force...
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