This study aims to achieve an improved airfoil performance at low Reynolds number, and to determine the optimum position and size of rectangular cross-section burst control plate (BCP) to suppress stall in airfoil. The type of airfoil used in the present study is NACA0015 (National Advisory Committee for Aeronautics) airfoil with 200 mm of chord (c) length. Here, rectangular cross-section burst control plates with different sizes and at different locations are investigated numerically at the low Reynolds number of 1.6×105 . Total of three positions (0.05c, 0.1c and 0.2c from the leading edge of airfoil), and four sizes (with heights 0.3 mm, 0.7mm, 1mm and 1.5 mm, and constant width 4 mm) of rectangular BCPs are simulated in ANSYS Fluent software using Transition SST model. The results indicate that the rectangular cross-section burst control plate is an effective device in the suppression of airfoil stall. For 0.7 mm and 1 mm height BCPs, the stall angle is postponed by 2° for all positions, while for 0.3 mm and 1.5 mm height BCPs, the reduction in sudden fall of lift can be observed but at the cost of reduction in maximum lift coefficient. Among various configurations, the 1mm height BCP located at 0.2c position is found to be most effective in the suppression of stall.

Unconventional computing is computing using unusual methods or unusual devices. It generates novel concepts and implementations of computing devices based on non-silicon information processing in physical, chemical, and living systems. It is a relatively new field which covers a wide range of applications. It seeks to develop new algorithmic paradigms and physical computing substrates. This paper provides a brief introduction to unconventional computing.

: The mode I fatigue crack growth behavior of a fiber reinforced metal matrix composite with weak interfaces is examined. In the longitudinal orientation, matrix cracks initially grow with minimal fiber failure. The tractions exerted by the intact fibers shield the crack tip from the applied stress and reduce the rate of crack growth relative to that in the unreinforced matrix alloy. In some instances, further growth is accompanied by fiber failure and a concomitant loss in crack tip shielding. The measurements are compared with model predictions, incorporating the intrinsic fatigue properties of the matrix and the shielding contributions derived from the intact fibers. The magnitude of the interface sliding stress inferred from the comparisons between experiment and theory is found to be in broad agreement with values measured using alternate techniques. The results also indicate that the interface sliding stress degrades with cyclic sliding, an effect yet to be incorporated in the model. In contrast, the transverse fatigue properties are found to be inferior to those of the monolithic matrix alloy, a consequence of the poor fatigue resistance of the fiber/matrix interface

This article empirically examines the typical factors of businesses that affect capital structure and macroeconomic environment. Using the balance sheet of 200 companies in Vietnam over 10 years (from 2007 to 2016), the author found empirical evidence to support the hypotheses related to asymmetric information theory, agency cost theory, trade off theory in determining the capital structure of enterprises in an emerging market economy. Special macroeconomic cycle significantly affects the financial decisions and capital structure of the company.

Radio propagation prediction is one of the fundamentals of radio network planning. It is thereforevital that the propagation prediction models are as accurate as possible; taking into account the practical limitations that characterized the propagation environment. A drive test was conducted to obtain the field measured data with which the models were appraised. This was done to determine the most suitable model for GSM network deployment in Makurdi, Nigeria. The analysis of the results showed that Okumura – Hata Model, COST 231 – Hata Model, Standard Propagation Model and Stanford University Interim Model gave Root Mean Square Error values of 11.39 dB, 11.59 dB, 8.11 dB and 18.48 dB respectively for GSM900; and 10.75 dB, 9.78 dB, 12.39 dB and 16.99 dB respectively for GSM 1800. Therefore, it was concluded that Standard Propagation Model and COST 231 – Hata Model would be more suitable for GSM 900 and GSM 1800 network planning and deployment respectively in Umuahia City, Nigeria.

Government and well meaningful Sierra Leoneans have tried and are still trying to keep the cities and towns clean. In striving to keep the cities and the towns clean, they designed some of the garbage bins (dustbins) by opening empty drums which easily attract particles rust because rain water settles on them. As a result, also they provide convenient breeding grounds for mosquitoes They also use bamboo sticks to design the garbage bins, which allow easy drainage of any water that tries to settle in them. The disadvantage is that they are not durable as they are easily affected by the sun and by the rain. The reseacher has therefore thought of designing a garbage bin (Conteh Bin) which will salvage this entire problem. This bin is durable, cost effective and can not only keep the cities and town clean but it will also beautifies towns and cities