This paper analyzes the performances and emissions of JETCAT P80 microengine, when jet A + 10% biodiesel (BD), 20% biodiesel, 30% are utilized as fuel, to each these combinations is added 5% Aeroshell Oil 500. The will be assessed based on engine speed, for generated thrust force, temperature in front turbine, fuel flow. investigate by four blends burning idle, at cruise max regime. realized maintaining regimes approximately a minute half. During tests, vibrations were monitored both...

Sound absorption coefficient is a commonly used parameter to characterize the acoustic properties of sound absorbing materials that plays an important role in noise attenuation. For this study specific material has been chosen order be evaluated experimentally and compared with simulated results. Both simulation experimental assessments estimate are based on transfer function method accordance standard SR EN JSO 10354-2. Results obtained for 15, 30, 45 mm sample thickness assess relationship...

Over the years, Bucharest’s Henri Coandă International Airport has registered a constant and high increase in air traffic, terms of both passengers aircraft movements. This paper presents traffic diversion solution for Otopeni RO airport, which aims to alleviate congestion by redirecting proportion planes nearby airport at Băneasa. The primary challenge faced Băneasa is proximity residential areas runway distances less than 300 m, resulting significant noise pollution issues. At Airport,...

ABSTRACT Numerical simulations of flames unstable, due to a parametric acoustic forcing, are performed in this paper. Results concerning the threshold instability compared quasi-steady theoretical predictions. Important disagreements found at large frequencies, suggesting that Markstein lengths relative curvature and stretch frequency dependent. discussed connection experiments new ideas. Key Words: Parametric instabilityacoustic forcingMarkstein Additional informationNotes on contributorsB....

Worldwide the additive manufacturing technology is used on large scale, different fields of application, not only when unique parts are needed. Therefore, process must be carried out based a clear procedure and work instructions, traceability entire assured acceptance criteria settled. A big role in quality control chain test methods to characterize metallic fabricated.This article aims provide an updated mini-review non-destructive testing (NDT) approaches identify defects related...

The cyclic oxidation behavior of an additive manufactured CoCrMo alloy with 0.14 wt.% C was investigated at 914 °C for 32 cycles, each lasting 10 h, resulting in a total exposure time 320 h. rate assessed mass gain after finishing 40 h cycle. It experimentally determined that the oxidative process this follows parabolic law, being fast beginning and slowing down first microstructural analysis revealed as-printed state, phases developed were primarily γ matrix minor traces ε phase. ensured...

In EFL learning and teaching processes, mental translation might play an essential role in the mind of foreign language learner. Some scholarly papers investigate types processing learners’ such as perception, acquisition dialogue production. Other studies, based on empirical psycholinguistic research about process translation, strategies well neuro-linguistic aspects this process, including cognitive brain imaging research. There is a consensus among researchers that using neurolinguistics...

The development of metallic materials for aerospace applications requires a controlled process the heat treatment in order to increase certain mechanical properties, such as metal hardness or strength, improve ductility, wear resistance, corrosion toughness and impact resistance. processes require precise control temperature over heating cycle. Laboratory furnace needs be calibrated meet measurement traceability according Aerospace Material Specification (R) Pyrometry Rationale SAE AMS2750...

Commonly, millions of employees are exposed to occupational health issues, including noise exposure during working hours. Noise is most encountered in industry sector but can also be found a wide range other workplaces (airports, concert halls, offices, etc). In this article, we review the levels inside machine shop, for single place, with scope assess safety, discuss research approach identifying control and reduce it. Generally, an expensive issue, many particularities solved exact cost...

The aim of this article is to present a series analytical considerations concerning the use mental translation in communicative teaching and learning English as foreign language. main part focuses on literature review impact method students’ language acquisition level during their practice. existing research topic has shown that learners strategy compare establish similarities differences between first Learners create translational field where they store results native These become some...

This research is part of the RO-BG Cross-Border Cooperation Program, project “CLEANDANUBE”, MIS-ETC 653, which has finalised by providing a common strategy to prevent Danube’s pollution technological risks with oil and products. paper presents new sustainable water purification solution. A short introduction will be offered an overview regarding methods greening waste provided. The theoretical aspects centrifugal separation phenomenon are studied preliminary bases were established. conveys...

In the frame of SANDI project (Support Actions to create New RDI partnerships in trans-border area order bring together Business and Research for accessing European Founds – SANDI, (2011–2013) http://www.comoti.ro/en/participarea_la_proiecte_europene_2_12.htm) between COMOTI Ruse University, measurements air quality characteristics were provided. Mobile automatic station Institute was placed front University 15 different atmospheric pollutants measured on 26th 27th June 2012. The values...

This paper is tackling the elbows bending process using hot mandrels. Through this pipe pushed over a fix or mobile mandrel, which defines expansion and radius of curvature very important that mandrel deformation to be minimum. The presents finite element model developed for described above, optimization tool parameters used obtain validate simulation conditions in order evaluate effect different materials on mandrels performances. numerical analyses were carried out by analysis software...

The scope of this study was to determine Young's modulus using ultrasonic measurements for two probes obtained through additive manufacturing. Young can be determined simple computations based on measured longitudinal and transversal elastic wave velocities material density. determinations were carried out samples manufactured differently, one measurement performed by NUCLEAR NDT Research & Services, which is RENAR (Romanian Accreditation Association) certified organization, another COMOTI...