Adama University

About: Adama University is a education organization based out in Nazrēt, Ethiopia. It is known for research contribution in the topics: Population & Adsorption. The organization has 840 authors who have published 1010 publications receiving 5547 citations. The organization is also known as: Adama Science and Technology University & ቴክኖሎጂ ዩኒቨርሲቲ, አዳማ ሳይንስና ቴክኖሎጂ ዩኒቨርሲቲ.

Enhanced Photocatalytic Activity of Reduced Graphene Oxide/Bismuth Sulfide Nanostructure Composites for the Degradation of Methylene Blue

Abstract: Today, the issue of the environment is the concern of scientists worldwide. Aside from developed countries, developing countries are revolutionizing their economy from agriculture to industries, ag...

PCCI Combustion for Better Emissions in Diesel Engines

Abstract: Premixed charge compression ignition (PCCI) mode of combustion is one of the advanced combustion concepts under low-temperature combustion (LTC) which has been found out in resulting acceptable emission results in internal combustion engines particularly in reducing particle matter and oxides of nitrogen altogether. Various experimental, as well as simulation works, were done on IC engines on PCCI mode of combustion. Performance and emission results from these works were compared with the conventional IC engine mode of combustion, and better results were obtained. Studies also indicated that through fuel modifications for having different properties helps to get optimized load range operations and emissions under PCCI mode of operation. Tuning the EGR at different load ranges were also found very important in PCCI mode of combustion. Researchers found out the existing uncontrolled fluctuation of soot with that of oxides of nitrogen in the common diesel engine operation could be managed by PCCI, which is a low-temperature combustion strategy usually used for diesel-like fuels. PCCI mode showed results of thermal efficiencies close to diesel engines and also provides means of minimizing particle matter and oxides of nitrogen at the same time. Such findings used the conventional direct injection compression ignition engines with minor medications and low costs of operations. Various investigations also showed that further investigations should be done in making PCCI combustion more efficient for less NOx, HC, CO and better load limit ranges through the optimized matching of EGR level, time of injection and also blends of the fuel. The review aims in describing PCCI mode of combustion and basic parameters affecting this advanced combustion concept and also to summarize the results obtained from PCCI mode of combustion as a scheme to reduce emissions.

Generalized fixed point results of rational type contractions in partially ordered metric spaces.

Abstract: OBJECTIVES We investigated the existence and uniqueness of a fixed point for the mapping satisfying generalized rational type contraction conditions in metric space endowed with partial order. Suitable examples are presented to justify the results obtained. RESULT Some new fixed point results have been obtained for a mapping fulfilling generalized contractions. The uniqueness of the fixed point is also the part of the study based on an ordered relation. One example is given for a result which is not valid in the usual metric space.

Analysis of regulatory elements in GA2ox, GA3ox and GA20ox gene families in Arabidopsis thaliana: an important trait

Abstract: The enzymes that are independently encoded by GA2ox, GA3ox and GA20ox genes control gibberellins (GA) biosynthesis and catabolism. This study analysed the promoter regions, transcription start site...

Evaluation of Corrosion Inhibition Efficiency of Aluminum Alloy 2024 by Diaminostilbene and Azobenzene Schiff Bases in 1 M Hydrochloric Acid

Abstract: The Schiff base compounds N,N - bis(salicylidine)-4,4 –diaminostilbene(SDS) and N,N - bis(salicylidine)-4,4 - diamino azobenzene(SDA) were synthesized, and their molecular structure was determined by FT-IR and 1H NMR. The corrosion inhibitions of Schiff base compounds on aluminum alloy 2024 in 1 M hydrochloric acid were evaluated by potentiodynamic polarization, impedance techniques, weight loss method, and scanning electron microscopic technique. The potentiodynamic polarization (PDP) studies revealed that SDS and SDA compounds acted predominantly as cathodic inhibitors. The electrochemical impedance spectroscopic (EIS) parameters confirmed the adsorption of SDS and SDA molecules over the surface of aluminum alloy 2024 alloy by forming an inhibitive layer. The weight loss studies showed that the inhibition efficiency of these compounds increases directly with concentration and decreases with an increase in solution temperature and immersion time. The thermodynamic parameters were calculated to investigate the mechanism of corrosion inhibition. The SDA was found to be more effective than SDS and followed the Langmuir adsorption isotherm model. The scanning electron microscopy (SEM) results revealed that the deterioration of the alloy surface is minimal in the presence of an inhibitor. Both Schiff base molecules exhibited superior corrosion inhibition for aluminum alloy 2024 alloy in HCl medium.