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.

The oldest nautiloid recorded from the Triassic Germanic Basin and the first ammonoid from the Aegean (Middle Triassic) of Poland

Abstract: During the Triassic in Europe, the Germanic Basin extended from England in the west to the eastern border of Poland in the east. Although cephalopods are common in some Middle Triassic (Muschelkalk) horizons, there still persists a gap in the palaeontological record of the eastern part of the Germanic Basin, notably in the lowermost parts of the Lower Muschelkalk, spanning the latest Olenekian-Aegean interval. The present contribution attempts to fill this gap by presenting the first ammonoid (ceratitid Beneckeia sp.) and nautiloids (Germanonautilus cf. dolomiticus and G. cf. salinarius) from the Lower Gogolin Beds (Upper Silesia, Poland). These Germanonautilus are the oldest nautiloids found in the entire Germanic Basin.

Mediating Effects of Cash Management in Relationship Between Capital Structure and Liquidity in Small and Medium Enterprises

Abstract: This study attempts to establish the relationship that exists between capital structure, cash management and liquidity in some selected small and medium enterprises in Jimeta, Adamawa state. It also determines the mediating effect of cash management in the association of capital structure and liquidity. A total of 365 copies of questionnaires were administered to 366 small and medium scale enterprise but a total 310 copies of questionnaires were returned fully and appropriately filled. The study made use of but primary and secondary method in collecting data. A cluster sampling method was used in this study and purposive sampling was also used to choose units of analysis in all clusters. Descriptive and inferential statistic such as frequencies mean, and standard deviation including Pearson’s correlation coefficient, multiple regression and sobel test were employed to obtain results. The results indicate that there is a positive significant relationship between capital structure and cash management, capital structure and liquidity, liquidity and cash management at a correlation of 0.657, 0.657 and 0.640 respectively, significant at 0.01 level (2-tailed) and df= 309. To support the correlation analysis, the regression analysis was also used to see the variability in the relationship and it indicates that 43.1% and 43% of the variability in both cash management and liquidity can be explained by the capital structure of the firm and also 41% of the variability in liquidity can be explained by cash management. The sobel test and the Kenny and Baron approach were used to test the mediating effect of cash management in the relationship between capital structure and liquidity and it indicate a partial mediation between the variables. A single research methodology approach was used and the findings from this research are cross sectional, future research through other methods could be undertaken to triangulate and also should be taken across time. The study recommends that chief financial officers exercise caution while choosing the amount of debt to use in their capital structure since a positive relationship exist between capital structure, liquidity and cash management. Keywords: Capital Structure; Cash Management; Liquidity; Mediation JEL Classifications: G3; J52

Big Data Virtualization and Visualization on Cloud

Abstract: Data virtualization is the procedure of combining data from different sources of information to develop a solo, logical and virtual view of facts so that it can be accessed by front-end resolutions such as applications, dashboards and portals without having to know the data’s exact storingsite. Several organizations ride multiple types of database management systems, such as Oracle and SQL servers, which do not work fine with one another. Therefore, enterprises face new challenges in data integration and storage of huge amounts of data. With data virtualization, commercial handlers are able to get real time and consistent information speedily, which supports them to take foremost corporate decisions. The process of data virtualization involves abstracting, transforming, federating and delivering data from unequal sources. The key objective of data virtualization technology is to deliver a single point of access to the data by aggregating it from a wide range of data sources.

Development and Characterization of Nano Clay Reinforced Three-Phase Sandwich Composite Laminates

Abstract: Polymer based sandwich composites are widely used in the development of components for aircraft, railway coaches and marine application. Among the varieties, Glass-Jute fiber hybrid and Glass fiber-PS foam core sandwich laminates find wider application in the railway coaches and building of boat hulls, because of its unique properties such as high strength and stiffness-to-weight ratio and good damping property. In the present investigation, PS foam-GFR sandwich laminates are fabricated with a total of four layers of glass fiber in the skin and PS foam as core, by varying wt% of nano clay in polyester resin so as to obtain four different combinations of PS foam-GFR sandwich laminates. Various tests are undertaken to study the properties. In general, the results of the various experiments have shown that, the nanoclay modified polyester resin sandwich laminates exhibit the highest mechanical properties when compared to the unmodified polyester resin composite laminates. In addition to the mechanical tests, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) have been carried out to examine the microstructure and elemental composition of the fabricated composites. From the analysis, it is observed that, the samples containing nanoclay contain more of Silicon and Aluminium due to nanoclay loading in the matrix. The relative comparison has also been made between Jute-GFR hybrid and GFR-PS foam sandwich laminates for suitable application of composites.

Antimicrobial properties of leptadenia hastata (pers) decne leaves extract

Abstract: Objective : This study was carried out with an objective to investigate the antibacterial potential of five leaf extract of Leptadenia hastata plant on some bacteria. Methods : Leptadenia hastata extracts were evaluated for potential antimicrobial properties. The leaves of the plant were extracted with n-hexane, dichloromethane, ethyl acetate, chloroform and methanol and then vaporized to give respective extracts. Antimicrobial activity against Escherichia coli , salmonella typhi, staphylococcus aureus and Klebsielia pneumonia , was determined by an agar well diffusion method. The optical density of the broth using UV mini spectrophotometer and zone of inhibition by the crude extract were determined. Results : The results showed that of n-hexane, ethyl acetate, dichloromethane and methanol extracts of Leptadenia hastata , methanolic and chloroform extracts displayed more activity with 1.10±0.10 mm ab and 0.97±0.06 mm ab where a Significantly (p<0.05) higher compared to different extract at the same concentration b Significantly (p<0.05) lower compared to the control, than others at 25-1000 ppm per well of the extracts tested. Conclusion : The present results showed the potential of the medicinal plant used by traditional herbal medical practitioners as natural antimicrobial agents, thus can be further used to determine the bioactive products that may provide as leads in the development of new drugs.