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Substrate removed Mach-Zehnder electro-optic modulators with InGaAlAs/InAlAs MQW cores are reported. Devices have 0.36 V-cm drive voltage length product and 2 pF/cm capacitance making them suitable for very low voltage and wide bandwidth operation.
In this study, a microdevice driven by capillary action has been developed for the high-throughput on-chip separation of plasma from a drop of blood. The microdevice is composed of an array of 2 μm deep and 2 μm wide PMMA (polymethylmethacrylate) channels. This PMMA microfluidic device is fabricated by hot embossing and thermal bonding from a Si master mold. The PMMA device was modified using oxygen...
Highly semi-polar (101̅3) oriented and fine structural AlN films were successfully prepared on silicon substrate by rf magnetron sputtering in this research. The dependence of the nitrogen concentrations and the material characteristics of the films (crystalline structure and micro morphology) were investigated. The crystalline structure of the films was determined by X-ray diffraction (XRD) and the...
This paper reports on new device for 3D cluster formation of stem cells under combinatorial seeding conditions - cell population and density. The device has an array of tapered holes of various sizes, and the surface is modified with hydrophilic polymer to prevent cell adhesion. Thus, the cells seeded onto the device aggregate in the areas defined by the holes. By varying the shape of the holes, cluster...
In this study, junctionless technology employed for fabricating pseudo tri-gate vertical (PTGV) MOSFETs is proposed and the RF/analog performance is also investigated and demonstrated. According to simulation results, the excellent performances such as high transconductance (gm), high cut-off frequency (fτ), and high transconductance generation factor (gm/Id) arc achieved. The numerical results also...
In this paper, we propose a simple trench-oxide thin-film transistor (TO TFT) process for 1T-DRAM applications. Our proposed TO TFT structure has several novel features as follows: 1. The buried oxide and the isolation oxide are carried out simultaneously in order to achieve a goal of simple process. 2. The trench design is used to improve both the sensing current windows (~72%) and the retention...
Electrostatic discharge (ESD) is an inevitable event in CMOS integrated circuits. Layout structure is one of the important factors that affect ESD robustness of MOS transistors. In this work, the impact of inserting additional layout pickups to ESD robustness of both multi-finger NMOS and PMOS transistors has been studied in a 90-nm CMOS process. Measurement results have shown that multi-finger MOS...
The system focused on the detection of integrated multi-parameter in the fermentation industry. We can achieve parameters of glucose, lactic acid and glutamic acid just by one sample and one sensor. The ancillary instrumentation based on m16(AVR) revealed the values of multi-parameter detection, simple and accurate, with some useful functions such as storage, query, upload etc.
Various chemistry indicators (such as BOD5, TN and NH4+-N) have been used to identify changes in the performance of constructed wetlands (CW) treating wastewater. However, measurements of biochemical characteristics in CW are laborious. This study aims to investigate whether simple characteristics of diurnal dissolved oxygen are a useful indicator of biodegradable pollution in CW. The variation of...
Sediment, sampled from Meiliang Bay in Lake Taihu, Eastern China, was employed to investigate the activities of nitrate reductase (Nar) and nitrite reductase (Nir) and their response to toluene. The optimum incubation times for assaying the activity of Nar and Nir in the sediment were 24-27 h and 21-24 h, respectively. Nir activity is easily inhibited by toluene while the Nar activity shows tolerance...
In this paper, we presented a new analytical model for the transconductance and output conductance of submicron gate-length GaAs MESFET transistors. After an analytical study of the current voltage characteristics, the transconductance and drain conductance mathematical expressions are determined as a function of the drain and gate voltages in different operations regimes (linear, non-linear and saturated)...
The objective of this paper is to demonstrate in which case asymmetric coupled structures can be analyzed as symmetric line models in order to use the quasi-symmetric approach. For this aim, a rigorous formulation was used; trial functions of even and odd modes were obtained from the symmetric case, and thus proposed for the asymmetric case. A comparative study of dispersion parameters shows the limits...
This paper describes about Implementation of MultiVoltage low power methodology for power optimization. Here Multi-Voltage methodology is applied to MSP430 16-bit microcontroller core using TSMC 65nm & 45nm NLDM libraries. The optimized power values are shown and compared among the libraries. Synopsys Power Compiler tool is used for synthesis and implementing the Methodology. Final Summary and...
In this paper, a hybrid-mode method is presented for an efficient propagation parameter computation of a large variety of shielded coupled planar circuits. Conductor strips are assumed to be embedded in a multilayered isotropic and/or anisotropic medium. The proposed technique is based on extension of the spectral domain approach and provides accurate expressions for computing the dyadic Green's functions...
Low-profile antennas are desirable in personal communications due to attractive features such as low cost, light weight, conformability, and ease of integration. A major challenge in low-profile antenna design is the trade off between the (reduced) antenna profile and performance. This trade-off can be ameliorated by loading the antennas with properly designed metamaterials. In this paper, we explore...
Previous works on MEMS actuated Fabry-Perot interferometer (FPI) highlighted promising results for flexible display applications. Three primary color pixels have indeed been obtained using both photolithography and Roll-to-Roll printing process with satisfying color purity and transmittance. However both of these processes are expensive and time-consuming for preparing master micropatterns. For these...
This paper presents electromagnetic analysis of Si-based small period blazed reflection gratings for a period of 0.6-1.5 μm in terms of the rigorous coupled wave analysis (RCWA) and its fabrication using fast atom beam (FAB) etching method. The optimized blazed gratings were successfully fabricated on a slanted silicon substrate by FAB etching method, and diffraction efficiencies (DE) for four kinds...
Freestanding circular GaN gratings are fabricated on a GaN-on-silicon substrate, and epitaxial growth of GaN is subsequently conducted on the prepared GaN template by molecular beam epitaxy growth. With the assistance of circular GaN gratings, the surface diffusion is improved and thus, the selective growth of GaN takes place. Epitaxial circular gratings with InGaN/GaN multiple quantum wells are generated...
A low voltage electrostatically actuated 90° turning flap is modeled and fabricated. The application is a new kind reflective, low-power, MEMS-based display with high contrast and reflectance. The system consists of a poly-silicon flap fabricated onto a silicon substrate with a transparent counter electrode on glass and a device layer of a silicon-on-insulator (SOI) wafer as spacer in between them...
Anodic aluminum oxide (AAO) nano-templates were prepared using the Al/Si substrates with the thickness of the aluminum films of about 500 nm. The pores of various sizes and depths were fabricated electrochemically through anodic oxidation. The optimum morphological structure for large area InGaN LED applications was formed by adjusting the applied potential, temperature, types of acid solution and...
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