Key Engineering Materials Vols. 562-565

Abstract: Thermoresponsive chitosan copolymers embed with antifouling agent paeonol in chitosan(CS) microparticles were prepared and the release dynamics was studied at different temperature. Chitosan microparticles have been formed based on ionic gelation process of CS and sodium tripolyphosphate (TPP). Paeonol was incorporated into the CS microparticles with the size about 0.1 μm. The physicochemical structure of samples was analyzed by FTIR and scanning electron microscopy (SEM). We investigated the influence of sodium tripolyphosphate (TPP) and paeonol on Encapsulation efficiency. Increasing TPP concentration from 1 to 3 mg/ml increased encapsulation efficiency of paeonol from 63% to 92%. Increasing peaonol concentration from 1.0 to 3.0 mg/ml increased peaonol encapsulation efficiency from 72% to 85%.

Abstract: The paper is presented the design of high-frequency OTA-C band-pass filter with on-chip automatic tuning. In this design, the linear operational transconductance amplifier (OTA) is proposed based on fully complementary differential pairs with source degneration, and achieves both low-distortion figures and high-frequency operation. The matching design between the master filter and the slave filter is also given, and the non-ideality effect of the OTA-C filters with on-chip automatic tuning is discussed. The whole circuit is designed using TSMC 0.18μm 1.8V CMOS process and post-simulation results show the center frequency of filter is 105MHz with relative error of 0.4%, when the process corner varies between SS, TT, FF, and the temperature from-20 to 120°C.

Abstract: Nanotechnology, in the 21st century, is the biggest driving force in the development of technology and industry, which has its wide range of applications. In traditional industries, nanotechnology can be applied to the development of digital printing ink. Digital printing appears as a new printing technology in the 1990s, the 20th century. And in recent years, along with the trends of a global energy saving and carbon reduction, the concept of producing green products with low-carbon, water saving, energy abating, pollution decreasing attributes has arisen. The introduction of digital printing to textiles brings the speed, flexibility, wide areas of color selection, environmental protection and the potential of cost saving etc; the technology becomes a major breakthrough in the textile printing industry. The industry is committed to the technology of environmental friendly digital printing and goes toward to a new pattern of bright future in fashion design. While the globe puts effort to develop digital printing, the core technology should not only focuses on how to come up with high-speed, large amount, low-cost machines, but also the R & D to the making and applications of digital printing, which has a great impact on digital printing quality. At the present, the digital printing ink of the reactive ink / acidic ink is applied to cotton fabrics and the fabrics containing hemp content. The printing process is from the fabric pretreatment → inkjet printing →solid color processing → washing → drying. Moreover, sublimation transfer ink is applied to fabrics containing polyester fiber content; but it cannot be fully colored the fabrics of general 100% cotton and silk, which is the biggest drawback of this sublimation transfer ink. Therefore, this study, primarily through the Nanotechnology with green environmental protection and reduction of carbon from Mimaki Engineering Co., Ltd., captures the moral of the cultural patterns of the local characteristics by the techniques of changing, modeling, designing, and arranging on the patterns of dress design. And it uses computer graphics software, Adobe Photoshop & Illustrator, to draw and trim the separate pattern and the foursquare consecutive pattern for the completion of fashion pattern designs. And it applies the features of the nano pigment ink on the fabrics of cotton, hemp, silk, and polyester fiber to interpret the artistic style of the local through digitized programming language. The importing of nanotechnology refills new sources of industrial competition. This study expects to explore the nanotechnology digital printing and combine with the design of the clothing pattern transforming on the designs, grinding pigment molecules to nano ultra-fine level with reduced light scattering phenomena and good light purity. Fully demonstrating the features of natural bright color, the endurance of pigment water and the light fastness will be able to create a lager space of application and market in the digital printing industry.

Abstract: This paper presents an integrated magnetic PDMS micropump for implantable drug delivery application. The micropump mainly consists of two structural PDMS layers: a PDMS functional layer that incorporates microchannels, a pump chamber and two planar check valves into a single layer, allowing for simple design and easy system integration, and the other PDMS membrane layer covering the pump chamber and holding a thin electroplated permalloy piece on top for magnetic actuation. The micropump can be driven by the interaction between the ferromagnetic permalloy and an external electromagnet, providing a remote and wireless operation method. Test results demonstrate that this micropump is able to produce a maximal flow rate of 0.15 μL/min at the driving frequency of 2 Hz with a volume resolution of approximately 1 nL per stroke, promising its application in various implantable biomedical systems.

Abstract: Abstract. The pipeline transport system of ice-water mixed fluid applies widely (e.g., ice cold storage system). Ice-water two phase flow is a non-settlement flow with viscous particles. Due to its complexity and variability, the correct parameter measurement of ice-water two phase flow, in terms of ice packing factor (IPF) and phase distribution, is an extremely challenging task. Electrical resistance tomography (ERT) is a novel imaging technology that can display cross-sectional electrical conductivity distribution within a pipe by using a tomography reconstruction algorithm. Compared to computerized tomography (CT), which is a standard tool in medical diagnostics and non-destructive testing of materials, ERT has many advantages in cost, speed and safety. The work described here is to study and learn about ERT implementation in measurement parameters of ice-water two-phase flow. In experiment the reconstructed image clearly display the phase distribution of ice and water in two-phase system. The research results prove that it is possible to monitor on-line the transportation process of ice-water two-phase flow using ERT system.

Abstract: The effect of pH on the material removal rate (MRR) and surface roughness (Ra) of hard disk substrate in glycine–hydrogen peroxide system abrasive-free slurry was investigated. The results show that, the MRR of hard disk substrate increases when both glycine and H2O2 are used in acidic slurries (pH=3.0) and decreases drastically in alkaline slurries (pH=10.0). The Ra of hard disk substrates is small in acidic slurries and increases drastically in alkaline slurries. Further, the effects of glycine, H2O2, and solution pH on hard disk removal were investigated by auger electron spectroscopy (AES), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. We also develop a reaction scheme describing the surface chemistry of the hard disk in this system.

Abstract: The small spatial displacement of the piezo tube scanner limits the AFM(Atomic Force Microscopy) scanning range, especially when facing up to cell topography scanning. And the low dynamic property of normal AFM tube scanner tube restricts the imaging speed. In order to achieve large scanning range and rapid scanning motion simultaneously, a special atomic force microscopy is designed. The 100um scanning range is obtained by the new scanner which is composed of the flexure guide structure instead of peizo tube. Furthermore, a new acquiring image method is used to eliminating AFM nonlinearity error. Using this scanning system, some large biological cells are imaged in liquid environments with 30 lines per second.

Abstract: Electrohydrodynamics (EHD) micro-jet printing technology has become a new method of micro/nano patterning and fabrication because of high resolution, good compatibility and simple structure. Firstly, stresses that Taylor cone meniscus subjected to under pulse voltage are discussed in EHD micro-jet printing system and tangential electric stress grows faster than normal electric stress, and tangential electric stress helps to “push” jet generation. Secondly, apply a pulse voltage superimposed over DC voltage, and investigate correlations between pulse frequency and drop spacing and then pulse frequency and drop diameter, and then compare and analyze the theoretic results with the experimental ones. Finally, as a result that it’s possible to obtain droplets with almost the same interval and desired size in the certain situation through controlling pulse frequency.

Abstract: Available task scheduling systems can not support MPI parallel computing applications to be suspended for quickly inserting the emergency parallel computing tasks. By modifying TCP/IP protocol, this paper proposes a new method to solve the processes’ communication synchronization for suspending parallel application; moreover, by modifying the signal mechanism of the Linux operating system, this paper also proposes a method to solve the problems of consistently suspending and recovering parallel application. A Parallel computing dynamic task scheduling prototype system is implemented, and the experiment results show that the prototype system can suspend running parallel computing application, and also support dynamic insertion of emergency MPI parallel computing application.

Abstract: This paper prepared some antimony nanoparticles with different particle size by electrochemical method. A method of preparing size-controlled antimony nanoparticles was established in the hydrochloric acid solution, which alkyphenol ethoxylates emulsifier was used as surface dispersants by electrochemical technology based on the optimization of the preparation technology. Those obtained antimony nanoparticles was characterized and analyzed by means of transmission electron microscopy (TEM), Fourier transform infrared absorption spectrum (FT-IR), X-ray diffraction (XRD). The experiment results show that alkyphenol ethoxylates emulsifier can effectively coat on the surface of antimony nanoparticles, current density and electrolysis time have an important influence on the particle size of those obtained antimony nanoparticles. When the current density is 25mA/cm² and electrolysis time is 30minutes, spherical antimony nanoparticles with an average diameter of 12nm and good dispersion can be prepared.