ABSTRACT Graffiti takes the form of written language whose authorship always remains anonymous. It precisely refers to any wall writing, pictures and symbols or markings of any kind on any surface anywhere no matter what motivates the writer. Most graffiti are viewed as illegal or vandalism of property by those in authority. Secondary school students use graffiti as a form of communication when they feel other channels to express themselves, have been blocked by those in authority. This study...
ABSTRACT Micro hydropower generated electricity can function as an effective tool for rural development. One of the barriers to smooth implementation of community/village micro hydropower schemes in the country is lack of appropriate hydraulic turbines, thus making the site specific costs of micro hydropower rather high, hence not easily affordable by the rural communities. The purpose of the study was to investigate the use of a vehicle live axle-propeller shaft system to replace conventiona...
ABSTRACT Greenhouse technology should be embraced as a way of minimizing food insecurity in Kenya. The insecurity is brought about by climate uncertainties. Greenhouses have attempted to solve this problem by enclosing crops in a climatically controlled environment. Each greenhouse has distinct parameters. Data on these parameters need to be collected at regular intervals. Depending on the type of crop, these parameters need to be controlled within the specified limits to achieve the maximum...
ABSTRACT Environmental pollution caused by the Municipal Solid Waste (MSW) incinerators has raised concerns about the quality of incinerators and the incineration process in Tanzania. Engineers and Scientists in general have appreciated that the installation of functional incinerators will increase the incineration process efficiency. Among the methods to achieve this is the application of mathematical modeling for the incineration process. Literatures have showed that related study in i...
ABSTRACT Audio noise monitoring and control has been a subject of research for several decades. Researchers have developed audio noise monitoring systems which rely on computers, internet and mobile telephone services which are costly and bulky and whose output is not easy to associate with any medical or psychological effects of noise. Active noise control has been explored using digital signal processors and field programmable gate arrays which are more costly than microcontrollers. Complex...
ABSTRACT The demand for silicon in microelectronics has put a lot of strain on the availability and eventually high prices for silicon type of solar cells. In this work, nickel doped cadmium sulphide (CdxNi1−x S) was investigated. This material was used as a window layer, combined with antimony sulphide (Sb2S3) as an absorber layer in fabricating glass/ SnO2: F/CdxNi1−x S /Sb2S3 /C-Ag p-n junction solar cell. Thin films of CdX Ni1−XS (CdS: Ni) and Sb2S3 were prepared by CBD method on or...
ABSTRACT The purpose of the study was to investigate the relationship between field work and performance in the teaching and learning of geography in Kiminini Division, Trans-Nzoia County. The performance of geography in the National Examination within the Division has persistently been declining over the years yet a national school in the division that has judiciously used field work as noted from the survey did post positive deviation in the last three KCSE results. It is worth noting that ...
ABSTRACT English as a language of instruction is recommended in the Nigerian mathematics classroom, it is also a second language where both teachers and students necessarily use at home to communicate. The study aimed at establishing the effect of English as a second language in teaching and learning of mathematical modellling at junior secondary school level in Nigeria. The junior secondary two learners in Nigeria are second language students who learn mathematics and particularly word probl...
ABSTRACT The access to a restricted area within a premise is normally done through a manual system of keys and locks. This has been automated through the use of personal identification number (PIN) or passwords and smartcard technology. However, such systems are faced with a number of limitations such as losing a smartcard, forgetting a PIN, duplication of keys and impersonation. Thus, the use of an authentication system such as biometric verification techniques has become an effective altern...
ABSTRACT Digital processors are built from very large scale integration circuits and the software to design them is only available to the manufacturers themselves. There is a need to design a central processing unit using large, medium and small scale integration circuits which can be used as a teaching aid in computer architecture and design. In this thesis a simulation model of a digital processor is designed using arithmetic logic unit, control unit and registers as building blocks with th...
Abstract The overall goal of this study was to establish the factors influencing the selection and utilization of learning resources by the tutors in three selected Primary Teachers‟ Training Colleges (PTTCs) in Kenya. This was for the purpose of investigating the selection and utilization of learning resources 4 in order to improve the quality of academic results. The researcher endeavored to answer the question; what was the background information for the tutors, available learning resour...
ABSTRACT The worlds’ developed countries began intense integration of ICT in teaching and learning that slowly filtered into some African countries. In Kenya, use of computers was also embraced which resulted into the introduction of integration of ICT in instruction in secondary schools. However, schools have had computers but the ways to use them effectively have evolved slowly. The study was done in secondary schools in Matungulu district, Machakos County, Kenya. Although there is provi...
ABSTRACT There is a rapid increase in demand for energy worldwide and one of the most promising approaches to resolve this crisis is through use of photovoltaic technologies. Dye sensitized solar cells (DSSC) are attractive candidates in this regard. This is because the materials they use are of low cost and non-toxic. Niobium pentoxide (Nb2O5) thin films have been stable as photo anode for DSSC. Methods that are used to deposit niobium pentoxide thin films include hydrothermal method, solgel...
ABSTRACT Thin film semiconductors of SnxSey and aluminum doped ZnO are potential candidates for the development of future generation improved efficiency and low cost solar cell devices. This is due to their high absorption co-efficient and good optical properties in the visible region of the solar spectrum. Optical characterization of the two thin films under varied composition and deposition conditions was done by optimizing them for an improved solar cell. Deposition of both SnxSey and ZnO:...
ABSTRACT The use of solar energy for cooking offers an alternative source of energy to the high cost of petroleum products and the diminishing wood fuel products for cooking and heating applications. An effective solar cooker is the one that can be used throughout the day and in the evening when there is no sunshine. Most areas in Kenya can be considered as a high potential solar energy area because Kenya is located on the equator. Most of the solar cooker designs do not have thermal storage...