Original Research Article

THE USE OF THE Ti-13Zr-13Nb ALLOY POWDER FOR MANUFACTURING OF PROSTHETIC PARTS BY SELECTIVE LASER MELTING

TOMASZ SERAMAK, KATARZYNA ZASIŃSKA, ANDRZEJ ZIELIŃSKI

Journal of Basic and Applied Research International, Page 110-116

The 3D printing is a manufacturing technique belonging to the additive methods able to prepare the designed parts for various purposes. The present reasearch was aimed to fabricate the prosthetic foundations and bridges made of the new Ti-13Zr-13Nb alloy by the selective laser melting (SLM) of a metal powder. The scanning electron examinations and micro scanning tomography were used to investigate the surface quality and intrinsic structure of obtained elements.  The best results, observed imperfections and the determinants of the quality process are discussed.

Original Research Article

DESIGN, CONSTRUCTION AND PERFORMANCE EVALUATION OF AN IMPROVED COCOA DEHULLER AND SEPARATOR

B. GIMEI, J. KIGOZI, N. KIGGUNDU, H. K. BALIMUNSI

Journal of Basic and Applied Research International, Page 117-129

Within the value addition chain of cocoa in Uganda, the majority of farmers export dried beans yet they could earn more if they were dehulled and winnowed. Not only would this increase their income but industries could emerge and create even more jobs. Simple value addition machines for cocoa i.e. dehullers and winnowers; suited for the Ugandan farmer are not readily available. Available machines with very superior winnowing capacities for example 99% are very bulky and expensive which makes them unsuitable for farmers. As such, a prototype was designed and fabricated at Makerere University and it achieved a dehulling efficiency of 99%, 19 kg/hr throughput capacity, spillage of between 11% - 30%, and a winnowing efficiency of 44%. This research focused on the design and fabrication of an improved prototype. The new design was fabricated using mild steel materials and tested using 4 batches of 1.5 kg each of well roasted cocoa beans. The prototype achieved a maximum winnowing efficiency of 83.3%, a dehulling efficiency of 99%, a high blower pressure, a throughput capacity of 91 kg/hr and negligible spillage. In conclusion, the new prototype is an improvement of old prototype and therefore can be adapted by farmers and entrepreneurs.

Original Research Article

DESIGN, CONSTRUCTION AND PERFORMANCE EVALUATION OF A SOYA BEAN ROASTER

H. AGABA, J. KIGOZI, A. AHUMUZA, H. K. BALIMUNSI

Journal of Basic and Applied Research International, Page 130-137

The current traditional methods of roasting used by soya bean processors in Uganda have crippled their scale of production due to the fact that these methods are time consuming, energy wasting and yield uneven roasted beans hence encouraging low quantity and quality of the roasted beans. The available imported soya bean roasters are expensive to purchase and costly to repair hence can’t be affordable by small and medium scale entrepreneurs. To overcome these challenges, a soya bean roaster was conceptualized, designed, fabricated and tested under various loads ranging from 20 kg-60 kg with increments of 10 kg. The roasting time and temperature, rate were monitored, data collected and analyzed. The roasting time ranged from 24 – 52 minutes while roasting temperature ranged from 31- 238 C. The average roasting rate was 69.24 kg/hr. The sensory evaluation carried out on the roasted beans gave a score of 7.4 as the overall acceptability of the grains.  It is expected that this machine would meet the needs of small and medium scale enterprises in a developing country like Uganda.

Original Research Article

DIY BIOPLASTIC MATERIAL DEVELOPED FROM BANANA SKIN WASTE AND AROMATISED FOR THE PRODUCTION OF BIJOUTRY OBJECTS

CHIARA GALENTSIOS, CARLO SANTULLI, MIRCO PALPACELLI

Journal of Basic and Applied Research International, Page 138-150

The present work proposes a possible use of a very diffuse waste in the agricultural and food sector, such as banana peels, for the fabrication of a biocomposite material adapted to the production of small design objects, in particular to a collection of bijoutry items. This procedure of self-producing the material, often defined as do-it-yourself (DIY) bioplastics, has initially an educational interest for designers to practice the experimental method in a kind of “advanced craftsmanship”, which has considerable connections with industrial design, especially in view of a customised approach, typical of Industry 4.0. With experimental attempts, the designer is able to confer to the material also an expressive interest, since it allows reasoning on producing a material with some interest for design purposes. In this specific case, the material, described as “Banpur”, has been developed through experimental trials, coupling the waste in the most possibly “light” and natural way to its matrix. In addition, it was aromatized with essences coming from Greece in an attempt to characterise it and in particular enabling the material to be as much as possible customised for use. This experimentation is inserted in the recent trend towards self-production of materials, which allows upcycling waste in a new concept of sustainability, based on a longer time duration for objects, therefore in the creation of an intrinsic value over time, which was demonstrated also by the fact that the objects obtained did last with negligible alteration over a considerable time span. This approach enables the establishment of a bond between the user and the objects themselves, and obtaining a usability of the material going beyond functionality and tactile interaction. For this purpose, the “personality” of the material was established through a specific study according to the typical characteristics established in literature for DIY materials.

Original Research Article

PERCEPTIONS OF SMALL SCALE FISH FARMERS ON AQUACULTURE DEVELOPMENT IN DOWA AND MCHINJI DISTRICTS IN CENTRAL MALAWI

DALO NJERA, CHARITY CHONDE, DAIMON KAMBEWA, JOSEPH DZANJA, DENNIS KAYAMBAZINTHU, EDWARD MISSANJO

Journal of Basic and Applied Research International, Page 151-160

Aquaculture holds the potential to improve productivity of small scale famers in Malawi. Establishment of fish farmers organisations with well-articulated institutional arrangement is essential in fish farming. This cross-sectional study examines perceptions of small scale fish farmers on aquaculture development in Dowa and Mchinji districts in central Malawi. A total of sixty-eight small scale fish farmers were used for the study. Data was collected using a standard structured questionnaire administered through face-to-face interviews and focus group discussion with leaders of fish farming groups. Data collected were analysed using descriptive and inferential statistics. The results revealed that majority (67.6%) of the farmers were mobilized by funding organisations to establish the fish farmer organisations. Most (40.0%) of the males joined the fish farming groups to increase their household incomes while the main reason for most (42.0%) of the female members was to enhance food security at household level. Inadequate knowledge on appropriate recommendations for organisational development and fish farming practices; lack of trust among members; and inadequate farming inputs were identified as the main challenges affecting the fish farming in the study area. However, there is potential for further development of the fish farming in the study area due to willingness of households to participate in fish farming activities. The study revealed that the identified challenges can be overcome by provision of training on organisation development and fish farming practices (81.2%); and provision of adequate support materials (69.2%). Therefore, the study recommends that local fishing institutions in the study area should be fully empowered (beginning with a participatory planning exercise) for sustainable aquaculture development.