Design and determination of the efficiency of a slanting-type solar water distillation kit

The solar water distillation system is a non-toxic and promising device for water purification. A slanting-type solar water distillation kit was fabricated and tested outdoor under the meteorological conditions of Imo State University, Owerri, Nigeria. The system consists of four major components; a wooden basin of surface area 0.16 m2, an absorber surface, a slanting glass roof and a condensate channel. Locally available materials were used to fabricate the solar still. The solar still produced an average of 0.09 m3 of distilled water per day, and this study was performed in the month of November, 2015. Daily efficiencies of the distillation kit were estimated and the average efficiency of the kit was found to be 7.7%. Though the efficiency is small as is peculiar to many solar systems, the output can be increased by increasing some parameters like the surface area, slanting angle of the roof, and the evaporation rate. Also, since the materials are readily available, one can fabricate as many solar distillation kits as possible to tackle the daily demand of potable water. Solar distillation kits can also serve as sources of distilled water for our hospitals and industries.Keywords: Imo State, potable water, solar still efficiency, water distillation, water purificatio

Tooth brushing, tongue cleaning and snacking behaviour of dental technology and therapist students

Objective: To determine the tooth brushing, tongue cleaning and snacking behaviour of dental technology and therapist students. Methods: A descriptive cross-sectional study of students of Federal School of Dental Therapy and Technology Enugu, Nigeria. Self-administered questionnaire was used to obtain information on demography, frequency, duration and technique of tooth brushing and tongue cleaning as well as information on consumption of snacks. Results: A total of 242 students responded. Dental technology students made up 52.5% of the respondents and dental therapist in training made up 47.5%. Majority (63.2%) of the respondents considered the strength of tooth brush when purchasing a tooth brush and 78.9% use tooth brushes with medium strength. Seven-tenth (71.9%) of the respondents brush their teeth twice daily and 52.1% brush for 3–5 minutes. About one-third (30.2%) brush their teeth in front of a mirror. Chewing stick was used by 51.7% of respondents in addition to the use of tooth brush. Tongue cleaning was done by 94.2% with only 9.5% using a tongue cleaner. Only 20.2% reported regular snacks consumption. Nine-tenth (90.4%) of respondents were previously involved in educating others, apart from their colleagues, on tooth brushing. Conclusion: This survey revealed that most of the dental therapy and technology students had satisfactory tooth-brushing behaviour. The zeal to educate others about proper tooth brushing revealed in this study suggests that the students may be helpful in oral health promotion

Extension of Short Rate Model Under a Lévy Process

A lot of abnormalities occur in real-life scenarios, thus leading to some difficulties in modelling such scenarios without a deeper understanding of certain aspects of Lévy processes. In this paper, the short rate model of Hull-White (1990) is extended to a model for capturing possibilities of jumps in real-life situations using a class of Lévy processes called a variance gamma process. Mathematics Subject Classification (2020). 91G30, 62P05   Keywords: Lévy processes, Brownian motion, Hull-White model, Variance gamma proces

Extension of Short Rate Model Under a Lévy Process

A lot of abnormalities occur in real-life scenarios, thus leading to some difficulties in modelling such scenarios without a deeper understanding of certain aspects of Lévy processes. In this paper, the short rate model of Hull-White (1990) is extended to a model for capturing possibilities of jumps in real-life situations using a class of Lévy processes called a variance gamma process. Mathematics Subject Classification (2020). 91G30, 62P05   Keywords: Lévy processes, Brownian motion, Hull-White model, Variance gamma proces

Fuzzy Bigroup from another Viewpoint

In group theory, given two groups G and H, it is possible to construct a new group from the Cartesian product of G and H, G × H. With this as a motivation, we replicate this concept in fuzzy group algebra. In this paper, we take a slight deviation from the familiar definition of fuzzy bigroup by looking at fuzzy bigroup from the idea of Cartesian product of groups. We define Cartesian fuzzy function on groups and give examples. We also define Cartesian fuzzy bigroup and study some of its basic properties. Keywords: Bigroups, Cartesian fuzzy function, Fuzzy bigroups