Applied Mechanics and Materials Vols. 236-237

Abstract: A simple synthesis method namely solvent displacement crystallization was used to prepare zinc phosphate, and obtained product was characterized by X-ray diffraction, scanning electron microscope and chemical analysis. The corrosive effectiveness of title zinc phosphate was evaluated by electrochemical impedance of two coatings immersion test. The results show that the obtained product is a highly crystalline, micronized and layered zinc phosphate. Comparing with commercial zinc phosphate, the synthesized layered microcrystalline product has excellent anticorrosive property in alkyd or epoxy coatings.

Abstract: The 1.5%Y2O3/1.5%La2O3/Cu composite was prepared by oxygen and nitrogen atomization spray deposition technique and internal oxidation. The microstructures, hardness, strength, electrical conductivity and arc erosion surface of the composite were investigated by optical light microscope, scanning electron microscope, micro-hardness tester, tensile test and arc erosion experiment. The results show that, with the increasing of internal oxidation temperature, the grains of the composite grow up obviously. When the internal oxidation reaches to 1000°C, the matrix grains begin to appear annealing twins. The micro-hardness was 436HV, the ultimate tensile strength was 580MPa, yield tensile strength was 503MPa, elongation of alloy was 8.7% and the electrical conductivity was 87% IACS of the composite by internal oxidation at 1000°C for 2h.The arc erosion surface shows a large number of paste-like coagulum and bubbles. Introduction

Abstract: W-26Re alloy was fabricated by spark plasma sintering (SPS) technology. The phases, microstructures and mechanical properties of the alloy were investigated by X-ray diffraction, optical light microscope, scanning electron microscope, energy dispersion spectroscope, digital display micro-hardness tester and tensile test. Results show that, using SPS technique can prepare W-26Re alloy with high density, fine grain and excellent mechanical properties. The relative density of W-26Re alloy was 96.2%. The main phases in the alloy were determined by the amount of (W) solid solution and the intermetallic  phases. The micro-hardness was 729HV, the ultimate tensile strength was 1680MPa, yield tensile strength was 1143MPa and elongation of alloy was 8.7%.

Abstract: In this study, a novel nanogap fabrication technique is proposed. The technique is based on electron-beam lithography combined with rapid thermal annealing (RTA) to reduce the self-aligned nanogap on metal layer. The procedure running through systematic experimental design via Taguchi method and considering the critical factors such as metal type, Si thickness, RTA temperature, RTA time and initial nanogap dimension affecting the final nanogap dimensions was optimized. The experiments were conducted using Taguchi method and modified particle swarm optimization for setting the optimal parameters. The experimental results show that the most important factors in nanogap reduction were the metal type and the initial nanogap. The optimal parameter settings were metal type Pt on 50 nm Si/SiO₂, 400°C, 60s and 43nm for initial gap. Experiment results found that the metal type Pt provided larger shrink ratio than that of Ni and nanogap down to 30 nm. It is also noted that the proposed approach was reproducible due to the confirmation experiments SNRs within the 95% confidence interval.

Abstract: A novel ester derivative, dodecyl xanthate acetic dodecyl xanthate ester(DXAD) was synthesized and it’s tribological behaviors as additives in hydrogenated oil, were evaluated using a four-ball tester. Results show that the compound possesses good antiwear performance, extreme pressure capacity, and good friction-reducing property. The action mechanism was estimated through analysis of the worn surface with X-ray photoelectron spectroscopy (XPS) and Scanning Electron Microscope (SEM). The results of XPS and SEM analyses illustrate that the prepared compound as an additive in hydrogenated oil forms a protective film containing ferric sulfide and ferric sulfate compounds on the rubbed surface.

Abstract: The paper presents the results of the investigations made on cast pieces consisting of aluminium with Si and Mg mixed metals, in order to establish the nature of the embeddings and the causes that led to their appearance.

Abstract: A new compact and scalable psp model for the layout proximity effect of poly gate in 40nm CMOSFET is proposed. This model takes into account the impact of gate space and neighboring gates number on mobility and flatband voltage. With the silicon verification, saturation current change up to 5%–7% and flatband voltage change up to 6-8mv is modeled in the constructed model. Vthlin, Idlin and Gmmax are also monitored. These good results show the importance of the new model for circuit design in advanced CMOS node.

Abstract: This study presents a new application of supercritical CO₂ (scCO₂) fluid technology for the pretreatment of ramie fiber materials. It was proved that the scCO₂ fluid could prominently eliminate the impurities of the ramie fibers. In particular, the lignin of ramie fibers, which usually needs to be removed in strong alkaline solutions, could be greatly eliminated by the scCO₂ fluid, especially in the presence of some swelling agent. The pretreatment with scCO₂ fluid resulted in the swelling and expansion of ramie fibers, which favors the further dyeing or finishing of ramie fabric.

Abstract: This paper presents a statistical model based on PSP MOSFET model in 40nm CMOS technology. Nine parameters are modified in PSP model to establish the statistical model. The simulation result verifies the accuracy of the model, the error of σ value is controlled within 5% and the error of mean value within 2%. The proposed model could optimize the circuit design in nanometer CMOS technology node.

Abstract: This research aims at examining how to decrease the absolute amount of cement so as to reduce CO2 generated in theprocess of cement production. Accordingly, this research examines the production of mortar by using a non-cement-type ofinorganic powders through industrial by-products such as blast-furnace slag and fly ash, investigates the pH-reducing effect ofcement products by using green tea, and checks the possibility to reduce pH.Inorganic powders were used for mixture of mortar, and experiments were conducted to measure the mortar’s compressivestrength, reduced amount of CO2, and pH concentration. From the test, first, it was found that the compressive strength was similar to the level of OPC when asmall amount of cement was added to inorganic powders, so in terms of compressive strength, the mortar with inorganicpowders was considered to be a good substitute for cement. Second, with regard to the reduction of CO2, CO2 emission was 20to 35 percent of that of cement when inorganic powders were used, which showed they would help greatly alleviate theenvironmental burden on the cement industry. Third, the older the material age was, the lower the pH concentration became,and the pH concentration got lower when GT was added to each type. In addition, mortar with inorganic powders is expected to be an environmentally friendlysubstitute for cement in that its compressive strength was similar to OPC’s and it can reduce emission of CO2.