Materials Literature
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The main challenge in designing diagnostic devices able to move along the colon is their locomotion method. Manipulating friction with the colonic surface is a key requirement for their safe and atraumatic propagation. One possible solution is to generate friction by means of adhesive forces. For this reason, a diagno…
This work aimed to study the corrosion inhibition of carbon steel in 2 M HCl solutions using some aminopyrimidine derivatives. In this investigation the techniques of measurements were: weight loss, linear polarization, impedance and corrosion penetration. The inhibitory effect of the investigated compounds resulted f…
Effective control of cathode airflow in a direct fired solid oxide fuel cell gas turbine (SOFC/GT) hybrid power system is critical to thermal management of a fuel cell stack. Hybrid fuel cell turbine designs often incorporate the use of a valved hot air bypass in parallel with the cathode flow to divert a portion of t…
Nanostructured films find increasing industrial application for instance in membranes, gas sensors, fuel cells, catalytic layers, biocompatible surfaces, batteries, and electronic components. The performance of these functional layers can be improved by using nanoparticles as building blocks and thereby incorporating…
In order to evaluate the deterioration characteristics during the lifecycle of bridge rubber bearing, a series of long-term accelerated exposure tests are performed on four kinds of rubber materials widely utilized for bridge bearings. Different degradation factors are applied in these tests, such as thermal oxidation…
Experiments performed on split Hopkinson pressure bar(SHPB) with a large diameter of 75 mm show that the dynamic stress-strain curve of anthracite of Yunjialing coal mine is of distinct plastic yield characteristics; and the initial elastic modulus,yield strength,as well as the ultimate strength go up with strain rate…
To analyze the market demand of bromine retardant. Although phosphorous retardant has begun to be produced in large producers under strict environmental evaluation worldwide,it is estimated that bromine retardant,esp. DBDPO,still has great future in the next ten years.
Phonon transfer in yttrium-oxide (Y 2 O 3 ) stabilized ZrO 2 ceramics is studied experimentally in the range of helium temperatures (1.7–3.8 K). A model of the structure of the intergranular layer in the ceramic is considered, which explains the temperature dependence of the phonon diffusion coefficient, makes it poss…
Scanning pyroelectric microscopy (SPEM) was applied to investigate grown-in polarity in trans-4-chloro-4'-nitrostilbene (CNS) single crystals. Sectors {011} and {011} were scanned for cross sections perpendicular to the a-direction. A rotational analysis for {011}, {011} faces was performed for a needle like crystal t…
The structural evolution of a material is calculated using a phenomenological grain-refinement and failure model based on the relation between these two processes. Direct extrusion and various schemes of twist extrusion are compared, and the effect of pressure is considered. The results obtained are used to draw concl…
Microscopic mechanism of martensitic transformation in nickel (Ni)–titanium (Ti) alloy is investigated by molecular dynamics (MD) simulation using embedded atom method (EAM) potentials. The computational parallelepiped specimen with nano-size dimension is surrounded by Ti-terminated free surfaces and constrained regio…
We demonstrated diamond processing using a variable pressure scanning electron microscope. Dents were formed in diamond by electron beam irradiation in air, nitrogen gas, oxygen gas, and water vapor. The processing in oxygen atmosphere showed the highest efficiency. The processing mechanism can be explained in terms o…
The stresses and the textures of electroplated copper films were studied using the X-ray diffraction analysis. The results show that the stresses in the films are always tensile. The films have (110) fiber texture at different thickness from 8 to 60 μm. From strain energy minimization point of view, the grains with (1…
Abstract The electronic band structure of NiO in the ferromagnetic state is calculated using the B3LYP hybrid density functional, the Hartree–Fock (HF) method, and the GW approximation (GWA) with dielectric functions constructed using either B3LYP or HF wave functions and energy eigenvalues. The band structure from th…
A porous material having near zero thermal expansion (NZTE) around room temperature was developed. This material was prepared by sintering a mixture of SiC, vitrified bonding material (VBM) and LiAlSiO4 at 850°C. LiAlSiO4 was added in different weight proportions, and it was found that a change in the amount of LiAlSi…
Carbon-carbon composites (CCCs) have extremely high thermal stability and shock resistance and find use in aerospace applications and aircraft disk brakes. The processing of CCCs can be divided into three stages: curing of precursor resin/fiber-reinforced-laminate; carbonization; and densification. During carbonizatio…
A new approach for the fabrication of n-type porous silicon layer is proposed. A hole-rich p-layer is arranged underneath the n-layer, and the np-junction is under forward biased condition in the etching process. Therefore sufficient holes can drift straight-upward and pass across the np-junction from p-region to n-re…
The effects of ultrasonic oscillations on properties and structure of extruded high‐density polyethylene (HDPE) were studied. The experimental results show that ultrasonic oscillations can improve the surface appearance of the HDPE extrudates; increase the productivity of the HDPE extrudates; and decrease the die pres…
Magnetism of intermetallic compounds SmFe2, SmFe3, Sm6Fe23, and SmFe7 were studied in detail using single crystals and the use of these materials has been discussed. SmFe2 and Sm6Fe23 have cubic magnetocrystalline anisotropy and the easy axis of magnetization in the [111] direction. SmFe2 has giant negative magnetostr…
According to the design rules for Functionally Gradient Materials (FGM) with high thermal shock resistance proposed in the previous work of the author, an Al2O3-(W, Ti)C FGM ceramic tool material with symmetrically laminated structure was fabricated by using hot-pressing technique. The cutting performance, failure mod…