Materials Literature
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This study aims to investigate the availability of face to face warp knitted pile fabric as a durable carpet after reinforcing with needle punched polyester felt and natural latex.In the paper the effects of pile yarn count, silicone resin and tuft density on the performance of warp knitted carpets are tested and repo…
Evaporation of micro-liter drops from solid surfaces at room condition is mainly governed by diffusion. Therefore, there should be no difference between evaporation rate of sessile and pendant drops. However, some studies indicate a difference and explain the difference using buoyancy. The objective here is to reconci…
One of the largest volume applications of permanent magnet materials are loudspeaker systems. High performant loudspeakers can be obtained by using rare earth permanent magnets with a high residual flux density, as for instance NdFeB. Because such devices are produced in a very large quantity and because the rare eart…
Abstract Quinton, Betty Tun-Huan. Ph.D., Engineering Ph.D. Program, Wright State University, 2016. Aligned Carbon Nanotube Carpets On Carbon Substrates for High Power Electronic Applications. One of the driving forces behind nanotechnology research is the miniaturization of electronic devices. Electrical and thermal t…
Cu2O is a semiconductor composed of earth - abundant and non-toxic elements that is as a promising photovoltaic material. One of the main issues limiting the efficiency of Cu2O solar cells is the availability of n-type window layers with an appropriate band offset and low interfacial reactivity. In this work, we show…
As novel absorber materials are developed and screened for their photovoltaic (PV) properties, the challenge remains to rapidly test promising candidates in high-performing PV devices. There is a need to engineer new compatible device architectures, including the development of novel transparent conductive oxides and…
2-nm-thick ZnO nanoislands have been grown using Atomic Layer Deposition (ALD) on the surface of n-i-p a-Si:H solar cells. With the nanoislands, an average improvement of 10.6% in short circuit current density (Jsc) and 12.05% in efficiency compared to the reference cell are achieved. Improved spectral response is obt…
Role of vacancy-type (N vacancy (V N ) and Ga vacancy (V Ga )) defects in magnetism of GaMnN is investigated by first-principle calculation. Theoretical results show that both the V N and V Ga influence the ferromagnetic state of a system. The V N can induce antiferromagnetic state and the V Ga indirectly modify the s…
This paper presents a simple and reliable method for detecting the faults occurring in a permanent magnet synchronous generator (PMSG) connected with a three-phase uncontrolled rectifier bridge (TPURB), which is based on monitoring the output DC current. A PMSG connected with a TPURB at constant speed is discussed und…
The kinetics of the solid-phase reduction of Cr 2 O 3 with carbon under chemical catalytic action on the reacting system is studied. A significant intensification of the process in the presence of small amounts of potassium and sodium salts is established. The concepts of the catalyst action mechanism are considered a…
In this work, a fluorinated resin is presented as host material for luminescent downshifting (LDS) applications carried out on polymer solar cells. The results obtained by depositing coatings with increasing concentrations of an appropriate organic fluorescent molecule on polymer solar cells show a trend with a maximu…
Resumo: O crescente interesse do uso de células-tronco (CTs) na medicina regenerativa, estão baseadas na sua capacidade de autorrenovação, reparação tecidual e imunomodulação. A terapia utilizando células-tronco é uma ciência em formação considerada uma alternativa terapêutica promissora no tratamento de diversas pato…
Ultrasonic testing is a conventional non-destructive test technique widely used in the industry. In this paper, we study ultrasonic testing for detection of internal corrosion of the thin-walled pipes. When the reflective surface is too close to the probe, ultrasonic excitation over a large area leads to interference…
Factory acceptance tests performed on High Voltage Direct Current (HVDC) transmission apparatus usually involve the application of high direct voltage and switching impulse voltage in separate withstand tests used to qualify the insulation system. However, the actual stress subjected to the equipment insulation system…
The objective of this work is to investigate the influence of slotted air gap constructive parameters on magnetic flux density of rotating machines. For this purpose, different approaches were used to solve the air gap field diagram using finite element method and the magnetic field distribution uniformity was evaluat…
The charge accumulation under DC voltage on the insulator interface is one of the critical factors that restrict the development of HVDC-GIL. The Saturated time and the final electrical field strength is determined by the volume conductivity. Therefore, in this paper, the interface charge accumulation model of operati…
High performance deep sub-micron T-gate AlGaN/GaN MOSHEMTs are demonstrated using lattice matched ALE MgCaO as gate dielectric. The 120 nm-Lg MOSHEMT has an IDMAXof 1.2 A/mm, Ronof 1.5 Ω·mm, a ft/fmaxof 101/150 GHz, with negligible hysteresis and IG, showing the promise as a GaN MOS technology. The work at Purdue Univ…
Recently, β-Ga2O3FETs have been introduced [1]-[3] as potential devices for high power, switching, and RF applications with increased performance and more cost effective means of production when compared to GaN or SiC. Documented material properties leading to a Baliga [4] figure of merit nearly four times that of GaN…
Current collapse will cause electrically recession such as reducing the output current density and increasing the dynamic on-resistance. The phenomenon becomes more serious when the device is under high operating voltage and high switching speed. In order to investigate the phenomenon of current collapse, the dynamic…
The heat sink integrated transfer molded power module has been developed in order to improve power density for the industrial inverter power module. In the conventional case type structure, heat from semiconductor chips has dissipated to the heat sink through the grease. However, with the introduction of Thermal Condu…