No abstract

No abstract

Noise is an unwanted sound which is mostly produced by the machines, transportation systems, engines, aircraft, etc. Noise pollution is the third pollution resource that has greatly placed an adverse effect on the environment, human health economy. As a result, it became imperative to develop a sound absorption medium that could minimize the aforementioned effects. In this study, orange peels and sachet water bags were used to develop a composite material. The materials (i.e. orange peel and sachet water bags) were prepared into six samples (that is 280g of orange peels and 120g of sachet water bags respectively). These samples were transferred into a two-roll mill (compounding machine), where they were melted at about 150°C temperature before transferring them to a compressing machine which was already set at a temperature of 130°C. This procedure was repeated on the rest of the samples respectively. The composite panel was coupled together to form a box. Three speakers were connected to MP3 and inserted into the box. Test was carried out to check for the sound absorption of the composite using a sound level meter. Various readings were obtained which include: maximum and minimum readings at frequency weighing of “A” and “C” and the sound level drastically reduced after coupling the box, this indicates that the composite board is a good sound absorber. The reduction level of the noise should be quantified.

Groundnuts marketed from farms are generally referred to as groundnuts in-shell. When freshly harvested, they may contain some dirt, vines and other foreign materials. Grades of these stocks are established based on intended use. Groundnut producers and commercial buyers use the grade as guidelines for trading. Grading aims at raising the quality and value of the product. Grading is generally limited to measurement of physical properties, such as, size distributions of the pods and percentage by weight of shelled kernels in the undecorticated groundnuts and percentage by weight of foreign materials. A groundnut grader was designed and developed. It was designed to sort three selected groundnut varieties commonly cultivated in Nigeria into three grades based on the geometric dimensions of the selected varieties. These varieties are SAMNUT 10, 14 and 18. Analyses of grading trials indicate that while SAMNUT 10 exhibits the three grades, the other varieties (SAMNUT 14 and 18) can only be graded into two grades. The grader has a rated capacity of grading 224 th −1 of under corticated pods. The maximum ranges within each grade when all the varieties were considered were: grade I-15.81 mm to 18.05 mm, grade II-12.44 mm to 15.78 mm and grade III-10.60 mm to 13.30 mm.

No abstract