Materials Literature
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Results obtained in a study of the physicochemical properties (porosity and acid-base properties of the surface) of aluminum hydroxides produced by solid-phase hydrolysis of aluminum salts are presented. A conclusion is made on the basis of the data obtained that these hydroxides have a higher adsorption capacity and…
Thermal design enhancements in a thermally-limited, fixed-size compact notebook system are investigated in this paper. System temperature, power, and fan speed are characterized under a range of activity levels. A finite element model is developed, and validated against measurements. Design enhancements improve coolin…
Fe/제올라이트 촉매의 저온에서의 NO의 암모니아 선택적 촉매환원반응 활성에 미치는 반응가스 중의 수분과 SO₂의 영향을 조사하였다. Fe/제올라이트 촉매에 조촉매로 Mn, Zr과 Ce를 첨가한 Fe/제올라이트 촉매로 수분과 SO₂가 포함된 저온에서의 NO의 암모니아 선택적 촉매환원반응에서 조촉매 첨가효과를 조사하였다. 조촉매는 이온교환법으로 철을 담지시킨 Fe/제올라이트 촉매에 건식 함침법으로 첨가하였다. 제올라이트는 디젤엔진에서의 SCR기술의 적용을 위하여 NH₄-BEA와 NH₄-ZSM-5을 사용하였다. 촉매의 특성은 BET, XRD, SEM/EDS와 TEM/E…
Recently, Cu 2 ZnSn(S x Se 1-x ) 4 (CZTSSe) has been received a tremendous attraction as light absorber material in thin film solar cells (TFSCs), because of its earth abundance, inexpensive and non-toxic constituents and versatile material characteristics. Kesterite CZTSSe thin films were synthesized by sulfo-seleniz…
Some of magnesium alloys have poor corrosion resistance in ambient air or aqueous environment due to their electrochemically active state. Different surface coating techniques, alloying and heat treatment are the ways to enhance the corrosion performance of magnesium alloys. The goal of this research is to study the c…
Abstract : This research investigates the effects of weave styles and crimp gradients (CGs) on the damage-tolerance levels and energy-absorption capacities of woven fabric-reinforced polymer (WFRP) composites. A comparative study was conducted to determine the specific failure mechanisms including fiber/matrix cohesiv…
The principal objective of orthodontic treatment is to deal with all kind of esthetic problems. In some cases the orthodontic treatment may cause periodontal defect and therefore would create another new esthetic problem. There are various surgical techniques that have been developed to repair the damage of the period…
This research focuses on using an atomizing apparatus to develop latent fingerprints. The atomizing apparatus for the development of latent fingerprints is an innovative device. This device improves conventional apparatus by providing safer and more efficient practices than those most adopted conventional ones includi…
Removal of heat is critical for the efficient and safe operation of many types of semiconductor device. Substrates like aluminium nitride are used in high-end devices and semiconductor packaging due to its excellent thermal and dielectric properties. The problem is the cost can be prohibitive for many devices. A new d…
Compression ignition engines have high thermodynamic efficiency therefore they have always been the first choice for heavy duty vehicles. However, future emission regulation poses a challenge for upcoming diesel engine combustion systems. Future emission regulations are becoming more restrictive, forcing engine design…
H νευροπάθεια του αυτονόμου νευρικού συστήματος (ΑΝΣ) της καρδιάς στον σακχαρώδη διαβήτη είναι αποτέλεσμα της διαταραχής της ισορροπίας μεταξύ του συμπαθητικού και παρασυμπαθητικού συστήματος, συσχετίζεται με την εμφάνιση διαταραχών στον έλεγχο της καρδιακής συχνότητας και της αρτηριακής πίεσης και τελικά καταλήγει σε…
The corrosion-protective properties of nanocrystalline TiN coatings ( d ∼15–25 nm) with respect to a 12Kh18N10T stainless steel substrate have been studied by the electrochemical method in a 3% NaCl solution. It has been shown that, in the studied thickness range of 1–9 μm, the protective properties of coatings formed…
Lynch's Bridge (inbound) over the Maribyrnong River was constructed in 1991/92, supported on six piers each of which consists of five columns and a crosshead. Two of the piers function as abutments and stand on dry land, whereas the other four piers are in the saline tidal river with a tidal range of about 0.4 to 0.7…
Statement of Problem: Thermal injury during dental implant placement and restoration is a clinical concern as it may cause bone damage and compromise osseointegration. The threshold level for heat-induced cortical bone necrosis is 47°C for 60 seconds. Objectives: To measure the amount of heat transferred to the implan…
Two-step processes for preparing Cu(In,Ga)Se 2 absorber layers consist of precursor layer formation and subsequent annealing in a Se-containing atmosphere. Among the various deposition methods for precursor layer, the nonvacuum (wet) processes have been spotlighted as alternatives to vacuum-based methods due to their…
In this study, Al2014 alloy refined with Al-5%Ti-1%B master alloy was prepared by strain-induced melt activated (SIMA) process. The main variables of the SIMA process were cold working, holding time and temperature in semi-solid state. Cold working was applied on specimens by upsetting technique to achieve 10%, 20% an…
This paper describes analysis and experimental characterization of low speed direct drive fractional slot concentrated winding (FSCW) surface permanent magnet synchronous motor (SPMSM) with consequent pole (CP) rotor, for which studies have been recently performed. The proposed motor, which consists of 30 poles and 36…
Research on the market construction steel was heat treatment with oil quenching has been done.The purpose of this experiment to increase the strength of the steel construction.The method was started from the construction steel, heated at a temperature of 700, 800, 900 °C with a holding time of 60 minutes and then cool…
The problems of the consequence of heat treatment of alloys performed using the concept of an ordering–separation phase transition are considered. Fe 50 Cr 50 and Ni 88 Al 12 alloys and U13 steel are used as examples to show that this transition occurs at a temperature specific for each system, and a change in the sig…
Interactions between two excitons can result in the formation of bound quasiparticles, known as biexcitons. Their properties are determined by the constituent excitons, with orbital and spin states resembling those of atoms. Monolayer transition metal dichalcogenides (TMDs) present a unique system where excitons acqui…