Emission and vibration analysis of diesel engine fuelled diesel fuel containing metallic based nanoparticles

This experimental study reports the results of emission and vibration characteristics of compression ignition (CI) engine with variable compression ratios (VCR) using nanoparticles added to diesel fuels. Three different nanoparticles namely, titanium (IV) dioxide (TiO2), copper (II) nitrate (Cu(NO3)2) and cerium (III) acetate hydrate (Ce(CH3CO2)3·H2O) were used with conventional diesel fuel at the dosage of 25 ppm and 50 ppm in order to prepare the four different test fuels. The engine tests were implemented in a single cylinder diesel engine under 4 Nm and 8 Nm engine load at a constant engine speed of 1500 rpm and at compression ratios (CR) of 17:1 and 18:1. The results showed that nanoparticles addition in the diesel fuels in ppm level did not caused any complications in the physicochemical properties but a slightly increase in heating value and cetane number. In addition, the combined effect of titanium dioxides and cerium acetate hydrate nanoparticles significantly reduced pollutants emissions regardless of NOx emissions. Especially, addition of cerium acetate hydrate into the blend fuels has become a dominant factor in the reduction of the harmful exhaust emissions. Furthermore, it was revealed that sound pressure level of engine block decreased with the addition of nanoparticles into diesel fuel which is parallel to vibration results. © 2018 Elsevier Lt

Clinical application of press on metal ceramic restorations: Clinical report | Metal üzerine preslenebilir seramik restorasyonlar ve klinik uygulamasi: Olgu sunumu

<p>Although all-ceramic restorations have been commonly used nowadays, because of their similar esthetics to natural teeth and biocompatibility, metal-ceramic restorations restorations (MCR) have been the traditional restorative option for the treatment of missing teeth due to their durability and predictability, The use of MCRs enables long-term restorative success with functional and aesthetic benefits and can be incorporated  in the rehabilitation of complex cases. Recent advances in dental materials have led to the development of MCRs, newer generation porcelains have been developed that have improved  physical properties, decreased abrasion potential than conventional feldspathic ceramics and  are pressed over metal alloy substructures (PoM). With the use of PoM technique the esthetic and function of the MCRs can be improved. This article represents the clinical steps of a patient treated with PoM and 2 year follow-up of the restorations.</p><p> </p><p><strong><a href="http://www.google.com.tr/url?sa=t&source=web&cd=1&ved=0CBcQFjAA&url=http%3A%2F%2Fwww.ozetkitap.com%2F&ei=8jOuTIzhB9fQ4wb_0OiHBg&usg=AFQjCNGuJMT9pBO6jP7uiv_4dsYurtJfDg">Ö</a>ZET</strong></p> <p>Tam seramik restorasyonların doğal dişe yakın estetiği ve biyouyumlu olmaları nedeniyle günümüzde yaygın bir şekilde uygulanmasına rağmen, metal seramik restorasyonlar (MSR)  yapısal sağlamlık ve bilinirliği sayesinde diş kayıplarının tedavisinde geleneksel bir tedavi seçeneği olmuştur. MSR’ ın kullanımı fonksiyonel ve estetik getirileri sayesinde uzun yıllar başarı sağlamış ve karmaşık vakaların çözümünde en uygun seçenek olmuştur. Dental materyallerdeki güncel gelişmelerle birlikte MSR’ da gelişmeler olmuş, fiziksel özellikleri geliştirilmiş ve feldspatik porselenlerden daha az aşınan ve metal alt yapı üzerine preslenen (PoM) yeni nesil seramikler geliştirilmiştir. PoM uygulaması ile birlikte MSR’ da estetik ve fonksiyon uyumunun arttırılması planlanmaktadır. Bu makalede PoM uygulanmış bir olgunun klinik uygulama aşamaları ve 2 yıllık takibi anlatılmıştır.<strong> </strong></p> <p><strong>Anahtar kelimeler:<em> </em></strong>Seramikler, estetik, dayanıklılık.</p&gt

In vivo efficacy of alkaline peroxide tablets and mouthwashes on candida albicans in patients with denture stomatitis

OBJECTIVE: Effective cleaning of dentures is important for the maintenance of good oral hygiene for denture stomatitis patients. The in vivo efficacy of three different brands of alkaline peroxide tablets (Polident, Efferdent, and Fittydent) and two mouthwashes (CloSYS II and Corsodyl) to eliminate Candida albicans on dentures was evaluated in this in vivo study. MATERIAL AND METHODS: Ninety denture wearers with clinical evidence of denture stomatitis were randomly divided into 5 test groups and 1 control group. Each group was further divided into three subgroups in which the dentures were subjected to 15-, 30-, and 60-min disinfection procedures. The dentures of each test group were treated with one of the cleaners, while those of the control group were treated with distilled water. Swab samples from the palatal surfaces (2 cm x 2 cm template delimited area) of the upper dentures were obtained before and after 15, 30, and 60 min periods of cleaner use and examined mycologically. RESULTS: The reduction in the number of colony-forming units (CFU) of C. albicans before, and after 15, 30, and 60 min of use of CloSYS II and Corsodyl was significantly greater than that of the control group (p0.05) among Polident, Efferdent and the control group in any of the treatment periods. Dentures treated with Fittydent appeared to have a significantly greater reduction in the number of Candida spp. only after 60 min of treatment. CONCLUSIONS: The results of this study showed that the use of mouthwashes significantly reduced the number of microorganisms on dentures

Effects of titanium-based additive with blends of butanol and diesel fuel on engine characteristics

In this study, the effects of metal titanium dioxide and butanol additives on engine performance, combustion, emissions, vibration and noise characteristics were investigated experimentally. The experiments were conducted at various partial load conditions with diesel engine having variable compression ratio. Engine was fuelled with diesel fuel and butanol-diesel blends with titanium dioxide (TiO2)-based additive. The results revealed that the properties of the blend fuels with the additive did not change significantly compared to diesel fuel. Specific fuel consumption (SFC) values of the engine were improved with increment of alcohol ratio, especially at higher engine loads. Carbon monoxide (CO) and particulate matter emission values with blend fuels decreased up to 36.17% and 36.53%, respectively. Nitrogen oxide emission increased at low engine loads. Of all test fuels, engine noise and vibration values of B5T25 and B5T50 usually decreased, whereas those values of the other test fuels increased. Copyright © 2018 Inderscience Enterprises Ltd

Evaluation of diesel fuel-biodiesel blends with palladium and acetylferrocene based additives in a diesel engine

Influence of biodiesel-diesel fuel blends with acetylferrocene and palladium based additives on diesel engine performance and emissions were studied experimentally. The additives were dosed into the blend fuels as 25 ppm. Bis-[N,N-dimethyl-N'-2-chlorobenzoylthioureato] palladium (II), PdL2 was prepared as palladium based additive. The engine tests were carried out in a single cylinder direct injection diesel engine at 4, 8, 12 and 16 Nm loads. The result of engine test revealed that the blend fuels with additives did not show the considerable effect on variation of cylinder pressure values. Also, specific fuel consumption (SFC) values with Ferrocene based additive showed comparatively better results than those of palladium based additives. Furthermore, CO and PM emissions decreased significantly up to 60.07% and 51.33%, respectively. Besides, at higher loads, NOx emissions values of the blend fuels increased, but decreased at lower loads. Moreover, Sound Pressure Level (SPL) and vibration acceleration values with the blend fuels decreased by 2.76% and 18.26%, respectively. As results, using of the metal based additives with dosage of 25 ppm contributed to improvement of SFC, emissions and vibration values for the diesel engines. © 2017 Elsevier Lt