Archives-March 2018

In a recent years, security for the thermal images are more necessary due to fast growing information technology. Here proposed an thermal image encryption based on histogram diffusion and permutation using chaotic map. As we know that histogram of thermal image distributed towards right (towards white pixel) and towards left (towards black). First step of proposed algorithm shift the histogram by mixing a random number. After that resultant image undergo permutation process with the help of chaotic map followed block wise histogram diffusing. In next level, apply the bit plane permutation. At last XOR operation with random image to get thermal encrypted image. The simulation results shows that proposed algorithm achieves high security.

A substantial part of Nigeria is part of semi-arid areas of the world, underlain by basement complex (hard) rocks which are very poor in both transmission and storage of appreciable quantity of water. Recently, a growing attention is being paid on the need to develop water resources in these areas largely due to concerns about increasing droughts and the need to maintain water security challenges. While there is ample body of knowledge that captures the hydrological behaviours of the sedimentary part, reported research which unambiguously illustrates water distribution in the basement complex of the Sokoto basin remains sparse. Considering the growing need to meet the water requirements of those living in this region necessitated the call for accurate water balance estimations that can inform a sustainable planning and development to address water security challenges for the area. To meet this task, a one-dimensional soil water balance model was developed and utilised to assess the state of water distribution within the Sokoto basin basement complex using measured meteorological variables and information about different landscapes within the complex. The model simulated the soil water storage and rates of input and output of water in response to climate and irrigation where applicable using data from 2001 to 2010 inclusive. The results revealed areas within the Sokoto basin basement complex that are rich and deficient in groundwater resource. The high potential areas identified includes the fadama, the fractured rocks and the cultivated lands, while the low potential areas are the sealed surfaces and non-fractured rocks. This study concludes that the modelling approach is a useful tool for assessing the hydrological behaviour and for better understanding the water resource availability within a basement complex.

Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide. The most common kinds of corrosion result from electrochemical reactions. It can be prevented if the metal is coated with something which does not allow moisture and oxygen to react with it. It can be controlled by either alloying or by anti rust solutions. The naturally occurring plant products are eco-friendly, compatible, nonpolluting, less toxic, easily available, biodegradable and economic to be used as corrosion inhibitor.Euphorbia caducifolia has been selected to study its corrosion inhibition efficiency. It is easily available in any season. It is native to Thar Desert of India and located on rocky terrain, hills. It is used for treatment of bleeding wound, cutaneous eruption, urinary problems, kidney stones, rheumatic pain, bronchitis, jaundice, diabities, stomach pain, hernia etc. It is also called “Thor” and “Danda-thor”. It contains caudicifolin) norcycloartane type triterpene, cyclocaducinol, triterpenes euphol, tirucallol and cycloartenol. Corrosion inhibition efficiency of arial parts of Euphorbia caducifolia was studied for aluminium in HNO3. Maximum inhibition efficiency was found 92.17% in 1N HNO3 acid with 0.8% leaf corrosion inhibitor whereas it was 90.53% for stem and 89.94% for flower with same concentration of inhibitor i.e. 0.8%. Inhibition efficiency was studied in different concentration of acid (1N, 1.5N, 2N and 2.5N) with different concentration of inhibitor (0.2%, 0.4%, 0.6% and 0.8%). Weight loss and thermometric methods were used. Inhibition efficiency was found to be increase with increase in concentration of inhibitor and decrease with increase in acid strength.

The pollinating of oil palm is cross pollination. The important insect that play an important role is Elaeidobius kamerunicus (EK). The superior DP hybrid with high sex ratio in young plants resulted in a lack of pollen.The Hatch and Carry technique is used to increase EK populations. This research aimed to determine the effectiveness of EK with Hatch and Carry technique on the fruit set level. The EK population increased the fruit set from 69% to 80%; Hatch and Carry techniques are effective on plantations dominated with young plant, and this technique can increase productivity by 5 - 16%

The spread of English as an international language and the emergence of the Internet as a fast communication channel are dual issues that define ELT in a globalized and digital age. Since its conception, the Internet has revolutionized the ways of human communication as well as English language learning in a global context. But the implications of this powerful force are yet to be fully recognized and realized in education and teacher education in Nigeria. Teachers of English language as well as learners of the language today need a new set of critical and interpretive skills. This paper attempts to discuss the impact of the Internet on English language learning as well as the need for new frameworks for teaching English language in a digital age in Nigeria.

Al-substituted ZnMg mixed ferrite prepared by conventional sol-gel method. Al substituted ZnMg ferrite of molecular formula Zn0.7Mg0.3AlxFe2-xO4 & Zn0.5Mg0.5AlxFe2-xO4 where (x=0.0, 0.1, 0.2, 0.3, 0.4) were prepared. The obtained samples were sintered at 8500C for 4 hours. The XRD used to study the structural properties such as particle size, lattices constant and the effect of doping concentration of Al atoms is discussed. The Structural images from XRD, SEM were presented. The Electrical characteristics of these mixed ferrites were studied using Cyclic Voltometric Analysis to measure logarithm of conductivity (log ?), dielectric constant ( ?) and loss factor at various frequencies and are reported. Hopping of electrons between localized stated of cations in the interstitial sites were discussed. The variation of activation energy with various ranges of frequencies was reported.

Some construction methods of quasi - symmetric 2- designs with no repeated blocks and three intersection numbers x = 0 , y and z between the blocks are proposed with illustrations.

The purpose of this paper is to utilize several classes of bivariate distributions whose conditionals belong to the two and three parameter lognormal distribution, and to some of their extensions. In this paper, the most general bivariate distribution with lognormal conditionals is fully characterized. The new distribution is very general, and contains as a particular case the classical bivariate lognormal distribution. We present quantum chemical computational method based on the conditional specification. In the application part, we have found the values for salivary cortisol of shy and non-shy adults by using the lognormal distribution and the corresponding mathematical figures are obtained in section 3. From these curves, computational results have been analysed and compared with medical conclusion.

This paper investigates the performance of an 11 kV silicone rubber (SiR) outdoor insulator when subjected to an alternative voltage at 50 Hz. The electrical field and potential distributions over the insulator surface were computed and analysed using the Finite Element Method (FEM) COMSOL Multiphysics software. Comparative studies of field and equipotential contours for the insulator under dry clean and uniformly contaminated surface conditions are presented. The surface power dissipation along insulator surface is calculated. The critical of high field regions on SiR surfaces were identified and the power dissipated in the pollution layer along insulator profile was revealed. This study showed useful information about the surface heating which, might be help to predict any dry band formations along the leakage path of the insulator and to evaluate the insulator characteristics and its behavior.

Cystic parotid lymphangiomas are benign vascular tumors that rarely appear in adults; they are usually detected in the first two years of life. Their appearance is due to an abnormal development of the lymphatic system during embryogenesis. Herein we report on two cases of intra-parotid cystic lymphangioma that occurred in teen age. A six year girl and a young girl of 13 years age were admitted in our unit because of an indolent and renitent isolated mass occupying the right parotid region. The diagnostic of an intra-parotid cystic lymphangioma was clinically advocated on echographic and CT imaging findings and then definitely proven after histopathologic studies of the ablation fragments. A total parotidectomy was made, removing the entire tumor. The parotid localization of cystic lymphangioma makes their surgical management difficult because of the development of lymphangioma between the branches of the facial nerve. The question of the benefit / risk ratio makes the therapeutic decision more complex because the aggressiveness of the radical tumor resection encounters a benign tumoral origin. It opposes two fundamental principles, first that of being radical on the tumor which is very recurrent and on the principle of remaining functional while preserving the function of the facial nerve.