Materials Literature
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Abstract In order to obtain nanopatterned surfaces, natural allophane particles originating from Japanese soils were immobilized as single particles on Si wafer substrates.When derived from aqueous suspensions, only a few nanoparticles were deposited and detected on the surface due to the weak adsorption of allophanes…
Multi-walled carbon nanotubes were obtained by catalytic chemical vapor deposition. Ethylene was applied as the carbon source and nanocrystalline iron without support was used as the catalyst. In order to remove amorphous carbon, the samples were reduced under hydrogen atmosphere. As a result of this process cementite…
Abstract. This paper presents an analysis allowing for the determination of the differential equation describing the circuit of the active filter inverter output current control with an additional measurement of input voltage. The resulting equation allows to determine the conditions that ensure stable operation of th…
Ingeniería Investigación y Tecnología es una publicación trimestral, arbitrada, de investigación científica y tecnológica editada e impresa por la Facultad de Ingeniería de la UNAM. Su propósito es difundir información y conocimientos originales e inéditos relacionados con la ingeniería. Es un espacio para profesores,…
The effect of cerium and/or gold addition to a manganese oxide which was greatly active in CO oxidation was studied. The catalysts obtained by this way were characterized by N2 adsorption, XRF, XRD and TPR, and their catalytic activity was measured in the CO oxidation reaction. The pure MnOx catalyst was active in the…
A description of a novel rolling contact fatigue test for evaluation of bearing steel characteristics is presented. Unlike traditional approaches where bearings are tested until failure, the proposed testing method is based on monitoring the material response during testing. The measurement principles are based on cha…
Current understanding of rolling contact fatigue is reviewed. The stress developed in the subsurface as a function of loading conditions, along with the resulting microstructural changes are described. Focusing on the dissolution of hardening phases and the occurrence of recovery and recrystallization, the relationshi…
The study of the transmission of electromagnetic waves through periodically perforated opaque screens, even though being a very classical topic, has received a renewed attention along the last fifteen years because of the discovery of the exciting phenomenon so-called extraordinary optical transmission [1]. The transm…
Frequency scanning antenna array based on composite right/left handed (CRLH) phased-array feed network is presented. The proposed array design method enables continuous beam scanning obtained through the feeding network design, which is different from the widely researched CRLH based leaky-wave antennas. It allows an…
In this paper thermal behavior of a 600kW 4200r/min interior permanent magnet synchronous motor (PMSM) with forced ventilation in the stator was analyzed using Fluent. Due to its high power density and compact structure, accurate thermal analysis of PMSM traction machine is of great importance in designing and optimiz…
Heterogeneous photocatalysis using nanostructured semiconductors constitutes one of the emerging advanced oxidation processes (AOP) for destructive oxidation of organic contaminants in water or air. Herein we report the kinetics of potocatalytic degradation of nitrophenols (NPs), namely, o-nitrophenol (ONP), m-nitroph…
Sebagian besar para pengrajin kapal kayu tradisional dalam pembangunan konstruksi kapal tanpa melalui proses rancang bangun atau perencanaan kapal yang sesuai dengan prosedur yang benar, karena pengerjaan bangunan fisik kapal hanya berdasarkan dari keterampilan atau kepandaian dan pengalaman pengrajin kapal yang diper…
In the paper we present adiabatic calorimetry and dielectric spectroscopy results for 2,3-dimethylbutan-2-ol (2,3-DM-2-B), one of the isomers of neohexanol. For 2,3-DM-2-B we have detected the following phase transitions: C2 (249.8 K) C1 (262 K) Is. No glass phase was found. In both crystalline phases C2 and C1 three…
A great disadvantage of switched reluctance machines is the heavy noise emitation, caused by the radial forces in the airgap, which excite the structure to vibrate. Especially the stator vibrations produce heavy noise, when the frequencies of the excited forces correspond to the eigenfrequencies of the stator. Every s…
The use of highly-enriched fuels is an effective method for reducing the number of spent fuel assemblies and improving fuel cycle economics, e.g., with >5 wt% 235U. However, from a criticality safety point of view, such high enrichment levels require a significant investment for the considerable modification of most f…
The corrosion inhibition properties of Ketorol on mild steel corrosion in 1.0 M HCl solution was studied using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and weight loss methods. EIS data were interpreted using CPE in equivalent circuit. Adsorption of the inhibitor on the mild steel sur…
Cover: The images show the aged microstructure of the heat resistant centrifugal cast alloy 35/45LC (Low Carbon ‐ LC) after creep rupture test (871°C/55.2 MPa/124hrs) using different imaging techniques: LM‐DIC, Light Microscopy ‐ Differential Interference Contrast; SEM‐BSE, Scanning Electron Microscopy ‐ Back Scattere…
Magnetic Properties of Amorphous Fe–Si–B Powder Cores Mixed with Pure Iron Powder, Kim, Hyeon-Jun, Nam, Seul Ki, Kim, Kyu-Sung, Yoon, Sung Chun, Sohn, Keun-Yong, Kim, Mi-Rae, Song, Yong Sul, Park, Won-Wook
The shifts in quasi-Fermi level (QFL) of TiO 2 films affected by additives are directly measured using three-electrode dye-sensitized solar cells (DSCs). The difference in QFL of TiO 2 under short circuit and open circuit are also analyzed. It is found that the QFL difference between the electrolyte side of the TiO 2…
Two series of Schiff base dioxomolybdenum (VI) complexes of the general formula [MoO 2 (L)(MeOH)] (L = D-glucosamine-derived Schiff base) have been synthesised, characterised and their asymmetric catalytic activities evaluated through the epoxidation of styrene. The molybdenum complexes with acetyl-protected D-glucosa…