Materials Literature
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This study investigated the influence of individual constituents of calcined shale or hybrid constituents of calcined shale and fly ash or silica fume on the workability and compressive strength. Calcined shale is heat treated in a kiln and then ground to a finer powder and the calcination temperatures of 800 °C were…
Nafion based IPMC (Ion Polymeric Metal Composites) has been prepared by using a tetraaquaplatinum (II) complex, [Pt (H2O)4])ClO4)2. Fabrication of a robotic mini-hand comprising five micro-fingers of 5 mm length, 400 μm width at a pitch of 600 μm has been achieved by adopting mechanicalmicro milling' technique. The mi…
본 논문의 목적은 수직 또는 경사각에 대한 분절형 관통자의 관통특성을 규명하는 것이다. 분절형 관통자의 기하형상비(L/D)는 각 1.0, 0.5, 0.25 이다. 적용된 충격속도와 경사각도는 각 1.5, 2.0, 2.5 km/s 그리고 15°, 30°, 45° 이다. AUTODYN-3D code 가 분절형 관통자의 관통성능을 연구하기 위해 사용되었다. 결과는 강판에 대한 분절형 관통자의 관통성능이 해당 연속적 관통자보다 분명하게 높은 특성을 나타냈다. 2.0 km/s 의 충격 속도와 L/D 가 1 일 때, 분절형 관통자의 뛰어난 관통성능을 관찰 할 수 있다. 이 경…
The surface modification process for coarse wool fiber which was oxidized by KMnO4 first, and then MnO2 covering on the fiber was reduced with Na2SO3 was studied. The method for surface modification of coarse wool fiber was determined from comparative analysis, the optimum oxidation process was as follows: concentrati…
The method of integral equations, which is based on the Green function of periodically arranged sources, is used for analyzing periodic metamaterials (photonic crystals) in the form of the simplest metallic and dielectric inclusions into a rectangular cubic lattice in a dielectric medium (matrix). Dielectric inclusion…
In this paper, we present a smart handheld surgical tool with tactile feedback to help microsurgery. This device consists of force sensors attached to the tool tip and tactile displays on the position of the fingerhold. The sensor is capacitive one and measures not only the magnitude of force, but also the direction o…
Transient-based diagnosis of electromechanical failures in induction motors has gained an increasing attention over recent years. The diagnostic in some specific situations (presence of load toque oscillations, light loading conditions) or of specific failures may be difficult when using the classical MCSA approach. I…
The iterative learning control method is applied to distributed parameter systems governed by parabolic partial differential equations (PDE). In this paper, an iterative learning control topic for a kind of nonlinear distributed parameter system which initial value can vary in a little space has been discussed. And an…
The electrical resistivity of single crystals of the spin-orbit Mott insulator Ba2IrO4 has been measured at pressures up to 30 GPa and at temperatures from 100 mK to 300 K. Ba2IrO4 shows a metal-insulator transition at around P c = 24 GPa, though it does not show superconductivity down to 100 mK. The low-temperature r…
Polycaprolactone (PCL) was surface modified with alkaline hydrolysis by NaOH and/or low pressure oxygen (O2) plasma treatment. The hydrolysis was conducted in two different stages: one was performed prior to PCL scaffold fabrication by a high pressure supercritical CO2 technique; the other was carried out after the fa…
Two xerogels with the ligand groups concentration 1.0 and 1.8 mmol gs−1 were prepared by sol-gel method from 1,2-bis(triethoxysilyl)ethane and trifunctional silane with thiourea groups [≡Si(CH 3 ) 2 NHC(S)·NHC 2 H 5 ]. It is shown that the increase in relative amount of structuring agent does not cause the increase in…
This article presents the design and experimental implementation of an observer-based model predictive control (OMPC) scheme with a notch filter which aims to compensate for the effects of creep, hysteresis, cross-coupling, and vibration in piezoactuators in order to improve the nanopositioning of an atomic force micr…
High purity nanoporous silica was fabricated using Shirasu a volcanic ash as a starting material. The starting materials were melted at 1400°C. A mother glass was formed by quenching the melt in pure water. Leaching was performed by immersing the mother glass into an HCl solution. Nonsilica phases formed by phase sepa…
ncreasing environmental awareness has led to an increase in the usage of wood plastic composites in many countries. The primary objective of this research was the decrease in the density of wood particle-polypropylene composites using chemical blowing agents while retaining their mechanical properties. Different amoun…
A second-order precession of the magnetization vector in a normally magnetized magnetic plate with a uniaxial anisotropy whose axis is tilted at an angle to the plate normal is considered. Under the conditions for the orientational transition, precession pattern of the forced oscillation in the form of a large ring fi…
In the conventional freeform lens design, people usually assume the inner surface as hemispherical and only the outer surface is designed. An important design degree of freedom on the inner surface is abandoned. In this study, by distributing the deviation angle, we proposed a method to design the inner and outer surf…
Within the elastic continuum model, with the use of the finite-element method, the stress-strain state of silicon-germanium heterostructures with semispherical germanium islands grown on an oxidized silicon surface is calculated. It is shown that as the density of islands is increased to limiting values, in the SiGe s…
Monte Carlo numerical simulation of the Stockmayer model is performed for particles with a sufficiently large dipole moment ( m * ≤ 4.2). At concentrations 0.16 < ρ < 0.31, a columnar phase is found which consists of parallel cylindrical layers, the particles forming a crystal structure in each cylinder with their dip…
We present ac conductivity spectra of telluritie glasses at several temperatures. For the first time, we report oscillatory modulations at frequencies around MHz. This effect is more pronounced the lower the temperature, and washes out when approaching the glass transition temperature T g . We show, by using a minimal…
This work reports the artificial compound eye using fractal zone plate (FraZP) arrays. Spherically arranged optical elements (ommatidia) of compound eyes facilitate wide field-of-view (FOV) imaging. However, due to the lack of curved image sensors, it was difficult to integrate hemispherical shape of an artificial com…