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.

Interaction of Two-Level Atom with Squeezed Vacuum Reservoir

Abstract: In this paper, the quantum properties of a two-level atom interaction with squeezed vacuum reservoir is throughly analyzed. With the aid of the interaction Hamiltonian and the master equation, we obtain the time evolution of the expectation values of the atomic operators. Employing the steady-state solution of these equations, we calculate the power spectrum and the second-order correlation function for the interaction of two-level atom with squeezed vacuum reservoir. It is found that the half width of the power spectrum of the light increases with the squeeze parameter, . Furthermore, in the absence of decay constant and interaction time, it enhances the probability for the atom to be in the upper level.

On the derivation, convergence, consistence and stability of a new numerical integrator

Abstract: For any numerical integrator to be efficient, ingenious and computationally reliable, it is expected that it be convergent, consistent and stable. In this paper, we develop a new numerical integrator which is particularly well suited for solving initial value problems in ordinary differential equations. The algorithm developed is based on a local representation of the theoretical solution to the initial value problem by a nonlinear interpolating function (comprising of the combination of polynomial, exponential and cyclometric functions). We further test whether or not the integrator satisfies the conditions for convergence, consistence and stability. From the analysis presented, it is obvious that the new numerical integrator can provide accurate solution to the original differential equation.

An empirical investigation into the effect of openness of the economy on the growth of output (RGDP) in Nigeria from 1986-2010

Abstract: The purpose of this paper is to investigate the effect of openness of the Nigerian economy on its growth, especially, as its affect growth of real GDP. The paper employed two models, viz: Ordinary Least Square (OLS); linear regression model and double-log regression model and also Phillips-Perron (PP) technique was used in testing the presence of unit root and Vector Autoregressive (VAR) was used the detect the flow of causation among the variables of the models. The results of unit root suggested that all the variables in the model were stationary, though at different levels, the results of VAR result revealed the existence of causation between RGDP and openness (OPEN), no causation existed between RGDP and FDI, TEDEBT, FEXR and BOP. One way causation also existed between openness (OPEN) and total external debt (TEDEBT). No causation existed between OPEN and FDI, FEXR and BOP. The result revealed no flow of causation existed from all the other included variables of the model to FDI, FEXR. The result further revealed the existence of causation between TEDEBT and FDI while one way causation between TEDEBT and BOP at only lag one (-1). Lastly, the VAR result revealed no flow of causation from all the included variables to BOP. This implied that RGDP, OPEN, FDI, TEDEBT, and FEXR do not caused BOP in Nigeria for the period under review. The results also discovered that openness, foreign exchange rates, and balance of payment were impacting positively on growth of output (RGDP) in Nigeria; while foreign direct investment and total external debt were impacting negatively on growth of output (RGDP) in Nigeria as shown by the regression results. The elasticity results indicated that, the growth of real GDP in Nigerian was less susceptible to changes in openness, foreign direct investment, total external debt, foreign exchange rates and balance of payment, their elasticities were inelastic. The significance of this paper is that, it stands to be a guide to policy makers. It has also push forward empirical discourse and provided literature to future research. Finally, this paper recommends the pursuance of stable and sustainable foreign policies such as export promotion and import substitution, effective control and utilization of external debt. Also to put in place, measures that will promote greater exchange rate stability and improve conditions of terms of trade, promote greater openness of the economy in order to enhance growth of the economy (RGDP). There is the need for the government to devalue its currency, reduce total external debt as well as reduction in the inflow of foreign direct investment for their negative impact on real GDP in Nigeria. It is hoped that coming up with the above measures could greatly promote the growth of real GDP in the country.

Biotic response to the latest Cenomanian drowning and OAE2: A case study from the Eastern Desert of Egypt

Abstract: The changes in macrofauna and microfauna, before, during and after the latest Cenomanian global Oceanic Anoxic Event (OAE2), from the Eastern Desert of Egypt are documented, along with an inferred paleoenvironment. The age of the studied OAE2 interval is constrained by the last occurrence of the marker calcareous nannofossils species Axopodorhabdus albianus along with the previously identified positive δ13C excursion from the coeval ammonite Vascoceras cauvini Zone (= Neocardioceras juddii Zone), enabling correlation with the peak ‘b’ of the OAE2. Based on the studied microfaunal assemblages, a warm shallow restricted lagoonal environment with mesotrophic conditions and strong seasonality is inferred. The presence of a rare ammonite (and ostracods) attest to the intermittent introduction of marine waters within this inner ramp setting. In terms of sequence stratigraphy, two 3rd order depositional sequences are recorded. The top surface of the first depositional sequence, at the sequence boundary, SB Ce 5 (the start of the OAE2), is marked by an abrupt faunal change with reduced abundances of the macrofaunal elements. This is in tune with other Egyptian records of relatively smaller loss (10 %) at the Cenomanian-Turonian boundary, as compared to much higher numbers (53–79% of species), globally. This faunal (biotic bottleneck) and lithological change (from siliciclastic-dominated deposits to a largely carbonate-dominated one) at the SB Ce 5 is attributed as a response to the latest Cenomanian drowning (the highest sea-level during the Phanerozoic), that also resulted in the formation of carbonate platform.

FPGA Based Architecture of Elliptic Curve Scalar Multiplication for IOT

Abstract: The current era has an explosive growth in communications. Many applications like internet banking, personal digital assistants, mobile communication, smart carts need for security in resource-constrained environments. Elliptic curve cryptography (ECC) used as an excellent tool for cryptographic, because of the security and smaller key sizes when compared with other public key algorithms. The efficiency is largely affected by the underlying arithmetic primitives. This paper explores FPGA designs for two of the most important field primitives namely multiplication and inverse. The smallest programmable entity in an FPGA is the lookup table. A novel finite field multiplier based on the recursive Karatsuba algorithm is proposed. This proposed multiplier combines two variants of Karatsuba. The general Karatsuba multiplier has a large gate count but for small sized multiplications is compact because it utilizes LUT resources efficiently. For largely sized multiplications, the simple Karatsuba is efficient as it requires lesser gates. This proposed hybrid multiplier uses a simple algorithm for initial recursion and small-sized final multiplication has been performed using the general algorithm. While comparing with reported literature this multiplier obtains the best area time product.