Materials Literature
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Enzyme kinetics studies have shown that Scaptodrosophila lebanonensis alcohol dehydrogenase (SlADH) and other drosophilid alcohol dehydrogenases function by a compulsory-ordered mechanism where the coenzyme binds to the free enzyme, and that a proton is released upon formation of the binary enzyme-NAD(+) complex. A pr…
The corrosion inhibition effect of carbon steel in sea water by 2-carboxyethylphosphonic acid (2-CEPA) and Ni2+ has been investigated using weight loss method and cyclic voltammetry. The results show that 73% inhibition efficiency is achieved with binary system consisting of 250 ppm of 2-CEPA and 50 ppm of Ni2+. Surfa…
The continuous purchase of higher quality standards in the production with parallel reduction of the costs leads to the need of a robust process design avoiding as much as possible the occurrence of defects in the production. Complex processes like microforming are highly dependent on local raw material changes, norma…
Abstract A series of CeO2-based Cu catalysts was synthesized by the co-precipitation method. BET, N2O decomposition, XRD, TEM, EDS, Raman spectroscopy, H2-TPR, and XPS were used to characterize the catalysts. The catalytic activity was tested in terms of CO conversion and H2 selectivity in a H2-rich coal-derived synth…
In this work, different natural fibres were studied and characterized, using optical and SEM microscopy. Those fibres were used to reinforce polyester and epoxy matrices and produce composite plates by hand lay-up. A vacuum bag was then used to allow improving the fibre impregnation, establishing a controlled pressure…
Microwave dielectric properties of BaTi 5 O 11 ceramics prepared by solid-state method with various calcining temperatures and sintering temperatures have been discussed. The ε r value of 42.8, the Q×f value of 44,000 GHz, and the τ f value of 42.4 ppm/oC were obtained for BaTi 5 O 11 ceramics sintering at 1100oC for…
Hummers and Offeman 방법을 이용하여 흑연으로부터 산화 그래핀(graphene oxide; GO)을 합성하였고, 이를 이용하여 두 가지 다른 작용기화 그래핀(FGS)을 합성하였다. 그래핀 판상(graphene sheet; GS)에 수직방향으로 hexadecylamine(HDA)이 치환된 Ver-HDA-GS을 HDA와 에폭시기를 반응하여 얻었고, 한편으로, 환원된 GO(Reduced-GO; RGO)를 통하여 hexadecanol(HDO)와 알코올을 반응시켜 HDO가 수평 방향으로 치환된 Hor-HDO-GS를 합성하였다. 합성된 GO, RGO, Ver-H…
In this study, the bulk compression measurement of electrospun nanofibers was performed by using a modified KES-G5s compression tester. The fibers were directly electrospun on several sample stages, and then transferred to a compression tester in order to avoid damage during the specimen preparation. Since the thickne…
In this work, we present the catalytic dehydrogenation of hydrazine borane $N_2H_4BH_3$ (HB) using supported nickel catalysts at $50^{\circ}C$ . In the presence of monometallic nickel catalysts, the dehydrogenation of HB is a one-step reaction consisting of the hydrolysis of the $BH_3$ group only. The challenge is to…
Polymer dispersed liquid crystal (PDLC) films are fabricated with various compositions of E7 liquid crystal (LC), 2-Hydroxy ethyl methacrylate (HEMA), Methyl methacrylate (MMA), n-butyl methacrylate (nBMA), Ethyl methacrylate (EMA), Tetraethylene glycol diacrylate (TEGDA), and Benzoin. The results show that the refrac…
Natural gas produced from coal or biomass is known as synthetic natural gas (SNG), which is expected to replace compressed natural gas (CNG). In this study, we used an 11-l heavy-duty CNG engine in a feasibility study of SNG. SNG, which is composed of 90.95% methane, 6.05% propane, and 3% hydrogen, was produced for th…
In the development of the OBD system of a vehicle, an aged catalyst is required to test the function of the system. This catalyst is partially deteriorated and the emission after this catalyst will exceed the regulation value with limited bound according to the testing protocol. This aged catalyst is very valuable, an…
The laser-induced doping of amorphous copper diselenide (α- CuSe 2) thin film with gallium (Ga) and indium (In) was performed to control/improve their electrical and optical properties. The CuSe 2 thin films sputtering-deposited using a CuSe 2 alloy target were amorphous and remained amorphous after doping with Ga/In…
The study of optical properties of Al2O3, SiO2, TiO2, and ZnO nanoparticles in weak optical fields is presented. We found that some nanoparticles have unique optical nonlinearity: The values of portions to nanoparticle refractive index and absorption coefficient increase to maxima, and then decrease to zero when the r…
This paper reports the fabrication process of ZnO and GaN nanobridges by electrospinning, to be used for gas sensing applications. The main purpose is to produce single suspended fibers with their surfaces completely exposed to the gas for an enhanced sensitivity when compared with sensors fabricated with structures d…
Aceclofenac (AC)/hydroxypropyl-β-cyclodextrin (HP-β-CD) complex intercalated layered double hydroxides (LDHs) have been synthesized by reconstruction method. X-ray diffraction, Fourier transform infrared and thermal gravimetric analyses indicated a successful intercalation of AC/HP-β-CD complex into the LDHs gallery.…
Electrochemistry has been introduced as a powerful tool in order to prepare new organometallic reagents for functionalizing of mesoporous silica. Preparation of the reagents was based on electrochemical oxidation of dihydroxybenzene derivatives in the presence of 3-(trimethoxysilyl)-1-propanethiol as a nucleophile. Th…
GaN microdomes are studied as a broadband omnidirectional anti-reflection structure for high efficiency multi-junction concentrated photovoltaics. Comprehensive studies of the effect of GaN microdome sizes and shapes on the light collection efficiency were studied. The three dimensional finite difference time domain (…
For diesel vehicles, NOx aftertreatment systems have become increasingly important, since the emission legislations continuously tightened. However, particulate matters (PM) and NOx aftertreatment systems have an impact on the engine operation and fuel penalties. Therefore, it is necessary either to find some auxiliar…
In this study, we demonstrated the evaluation of the device parameters, such as the cell thickness d, pretilt angles at the top and bottom substrates θ0 and θd, and twist angle φt for the guest-host (GH)-type electrically controlled birefringence (ECB) and twisted nematic (TN) modes, using the renormalized transmissio…