The management of current assets (CA) such as cash, marketable securities, inventory and debtors, etc. is a vital aspect of corporate finance. These assets must be managed efficiently in order to maintain the liquidity of the firm while also ensuring that they are not kept at high levels either....

Harmonic analysis of sunshine duration and solar irradiation measured at Sebele, Botswana is carried out. The data used consists of the monthly averages and the Julian-days averages of sunshine duration and solar irradiation sequences. This study involves splitting the time series into...

The analytical method developed by Nijegorodov et al. [Renewable Energy, 4, 529–543 (1994)] in order to find the optimum slope of an absorber plate, variously oriented at any latitude, is applied to study the variation of daily optimum slope with latitude from the north to the south poles. For...

A graphical method to estimate the efficiency of a solar concentrator used for heating and boiling liquids is described. The method involves the measuring of temperature of stagnated liquid in the absorber as a function of time at noon. The graphically estimated efficiency is within 5% of the...

This paper presents a theoretical and experimental analysis of a non-tracking, cylindrical solar concentrator with circular cross-section of radius R. The focal length of the concentrator oscillates between 0.5R and 0 with decreasing amplitude as the rim angle increases from 0 to 90°. The...

The Republic of Botswana is one of the sunniest countries in Southern Africa. It has very little cloud cover, insufficient rainfall, very low humidity, and very low wind speed throughout the year for most parts of the country. The daily extremum temperatures appear to be very much related to...

A graphical method to measure average and instantaneous efficiencies of a solar concentrator used for heating and boiling liquids and a flat plate collector is presented. The overall heat loss coefficient for the collectors and the optical loss factors: ϱγ(τa)b—the product for a...

Two new atmospheric transmittance models are proposed to calculate the diurnal profile of solar radiation intensity. These two, together with six other models proposed by earlier researchers, are used to obtain analytical formulae for the optimum tilt angle for a plane absorber plate at any...

Innovation management has been a subject of immense concern to researchers. Both continuity and change aspects in this context have been scrutinised at length, but management of continuity together with change has only recently been gaining some attention. This paper contributes to the...