2015 fascicula9 nr1

Water-in-Diesel Emulsions as Alternative Fuel for Diesel engines part I: Water-inDiesel Emulsions. A Literature Review

2020-09-03T13:27:49Z

Water-in-Diesel Emulsions as Alternative Fuel for Diesel engines part I: Water-inDiesel Emulsions. A Literature Review Vrabie, Vlad; Scarpete, Dan; Chioșa, Bianca Elena Although emulsions have found numerous and various applications in chemical, pharmaceutical and food industries, emulsions of water in diesel fuel are applicable alternative fuels for the existing diesel engines. Water-in-diesel emulsion fuel can improve the combustion efficiency of a diesel engine and reduce harmful exhaust emission, especially nitrogen oxides and particulate matter. In general, due to the lower heating values of water-in-diesel emulsion fuels, torque and power produced by diesel engines fueled with emulsified fuels are lower as compared to the neat diesel fuel. The heterogeneous results regarding the use of water-in-diesel emulsions as fuel for diesel engines suggest that more experimental work for optimizing the emulsion formulation is recommended. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 1 - 2015, ISSN 1453 – 083X

Detailed Microcontroller Architecture Based on a Hardware Scheduler Engine and independent Pipeline Registers

2020-09-03T13:27:49Z

Detailed Microcontroller Architecture Based on a Hardware Scheduler Engine and independent Pipeline Registers Andrieș, Lucian; Găitan, Gheorghița In the world of real time operating systems, task switching, communication between threads and synchronization are implemented in software. Some of the mechanisms used may introduce big latencies in task recurrence, task jitter. This kind of problem, which is sporadic, may lead to system failure for safety-critical areas. This issue may occur in the real time systems that have really fast response time as requirements. For this particular example, the tasks are succeeding very fast, resulting in a lot of overhead because of the time spent in task switch. Our research has led us to the conclusion that a microcontroller architecture, based on a static hardware Scheduler and independent Pipeline Registers, will be capable of executing multiple tasks with approximately no delay between every task switch (5 machine cycles). The nMPRA (n Multi-Purpose Register Architecture) architecture, which consists of 2 sets of registers: local such as coprocessor 2 and global such as a peripheral on the slow bus, offers support for preemptive real time operating systems. Both architectures, nMPRA and nHSE (n Hardware Scheduler Engine), complement each other and take the real time operating system programming to a whole new level. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 1 - 2015, ISSN 1453 – 083X

Electrical Properties of Ultra-Sonicated Epoxy Resin

2020-09-03T13:27:49Z

Electrical Properties of Ultra-Sonicated Epoxy Resin Graur, Iulia; Bria, Vasile; Cîrciumaru, Adrian; Bîrsan, Iulian As ultra-sonication is a mostly used method to disperse the particles into the polymer matrix, the aim of this study is to point out the effect of epoxy’s exposure to ultra-sounds over the electrical properties, especially the electrical conductivity. As the epoxy resins are insulators, the method is based on the determination of electrical conductivity via the measurement of electrical insulation resistance. The polymer solution was exposed for 45 minutes to ultra-sounds produced by one, two, three and four generators at different values of ultra-sounds frequency. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 1 - 2015, ISSN 1453 – 083X

Dimensional Changes in Some Iron-Based Powder Metallurgy Alloys

2020-09-03T13:27:49Z

Dimensional Changes in Some Iron-Based Powder Metallurgy Alloys Marin, Mihaela; Potecașu, Florentina; Potecașu, Octavian The purpose of this paper is to present the dimensional changes in some ironbased (P/M) alloys. The specimens produced from atomized iron powder and alloyed powder with different sizes (< 45, 45-63, 63-100, 100-150, >150 μm) were subjected to compaction at 400 and 600 MPa. After compaction, the specimens were sintered at 1150 ºC for 1 h. The density of green and sintered iron and ironbased alloys, the mechanical properties (hardness) and dimensional changes were evaluated. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 1 - 2015, ISSN 1453 – 083X