Materials Literature
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The structure and the mechanical properties of aluminum V95 and AMts alloys with various grain sizes (from micron to submicron) are studied in a wide range of strain rates (from 10 –3 to 10 5 s –1 ). Submicrocrystalline (200–600 nm) materials are formed by dynamic channel-angular pressing at a strain rate of 10 5 s –1…
As the California High-Speed Rail (HSR) project becomes reality, many communities involved in, or affected by, the California HSR project have considered how to connect the new HSR passenger services to local urban transportation systems - such as bus and light rail systems - and how they can take advantage of HSR acc…
A new heterogeneous catalyst, Mn(salicylaldimine) complex covalently bonded to α-titanium phosphate has been synthesized by in situ method and characterized by BET surface area, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Fourier transform infrared spectra, X-ray photoelectron sp…
Semiconductor Nanoparticles (NPs) displays interesting electronic and optical properties that are attributed to the quantum confinement effect and their large surface to volume ratio of atoms, both of which are fundamental and of technological interest. Currently, cadmium sulfide (CdS) nanoparticles have attracted con…
The effective application of a biocatalyst based on recombinant enzyme preparations obtained using Penicillium verruculosum is studied for the modification of marketable bleached sulfate hardwood cellulose. The effect of treatment with cellulase complex on the structure, morphology, and surface state of cellulose fibe…
The structural, transport, and magnetic characteristics of polycrystalline Mn x Si1–x (x ≈ 0.51–0.52) films grown by pulsed laser deposition onto Al2O3(0001) substrates when the low-energy components are deposited owing to collisions with the atoms of the buffer gas have been studied in the “shadow” geometry. The magn…
We present the experimental demonstration of the first terahertz isolator (working frequency > 1 THz), obtained using the non-reciprocal electromagnetic properties of graphene under magnetostatic bias. The presentation will cover in detail the design, fabrication and measurement of the device. The isolator operated in…
The influence of Spark Plasma Sintering / Field Assisted Sintering Technology applying pulsed direct current up to the root-mean-square current densities of 129 A/cm2 on the interfacial reactions in Al - Fe - Al stacks was investigated at temperatures between 500°C and 600°C. Independently of the current density and c…
Warpage has become a very critical reliability problem for the advanced electronic packaging technique. One or more chips are stacked on the substrates for a device. The device thus contains materials that have different physical properties. The most prominent problem would be the differences in the thermal expansion…
W pracy opisano rozwój pęknięć zmęczeniowych dla trzech różnych bimetali uzyskanych metodą zgrzewania wybuchowego. W każdym przypadku był jednakowy materiał podstawowy – stal węglowa P355NH, zaś materiały nakładane to: stale austenityczne 316L, 254SMO oraz super duplex (50% struktury ferrytycznej, 50 % struktury auste…
In this paper, some results about the design and the full-wave analysis of Printed Conformal Reflectarray Antennas, able to work in the Ka band, using non-conventional re-radiating elements are presented. They introduce an improvement of the radiation characteristics, and in particular an enhancement of the bandwidth.
The corrosion behaviour of a high-alloy CrMnNi steel was investigated electrochemically in a 0.5 M sulphuric acid solution. The characteristic regions of the active, passive and transpassive state for the material were monitored by means of acoustic emissions. To this end, the steel was potentiostatically polarised an…
An analytical approach for controlling the zeros of a scattering event (i.e., cloaking) is given, substituting the concept of positive-negative constitutive parameters with a positive-negative contrast formulation. Starting from the zero scattered field condition, a proper manipulation is performed and two different e…
The paper presents a study on the torque performance of a novel switched reluctance motor (SRM) with E-shaped modular stator and segment rotor based on direct instantaneous torque control (DITC). The structure of the machine and the main notion of DITC are first introduced. The corresponding control rules in each indu…
Despite several past proposals to employ the inner cores of multiwalled nanotubes as, among others, ultra-highfrequency oscillators, memory devices, and nano-scale sensors, driving into motion a mass initially at rest within the nanotube outer walls has remained a crippling practical obstacle. In addition to the chall…
Cellulose nanofibrils (CNF) was made from oil palm trunk (OPT) with soda-anthraquinone pulping, chlorine dioxide bleaching, carboxymethylation, followed by mechanical grinding. Size of this CNF was 16-40 nm of width confirmed by TEM. To evaluate CNF from OPT as cosmetics raw materials for moisturizing component, water…
We report on the results of analysis of acoustic emission (AE) under thermal action on a triglycine sulfate (NH2CH2COOH)3 ⋅ H2SO4 crystal. The triglycine sulfate single crystals grown from solution and not subjected to mechanical treatment are heated to a temperature above the Curie point (T C = 49°C). During natural…
Aluminum is extremely active metal on the surface of which the oxide is instantly created when exposed to atmosphere. This naturally generated film has little industrial value as it has thickness as thin as 10 nm. Hence, oxide films are often made thick by electrochemical method. The characteristics of the films can b…
Prospects for using upconversion nanoparticles as markers for tumor optical imaging are discussed. Using a model of epidermoid Lewis lung carcinoma engrafted in mice, luminescent signals from nanoparticles delivered into the tumor tissue are registered in vivo.
Formation of supramolecular polysiloxane polymers was studied by using oligoamide strands 1a , 2a , and 3a bearing multiple hydrogen bonds as association units. According to SEM and TEM studies one polymeric strand associated into supramolecular spherical assemblies via duplex formation. The results demonstrated the e…