School of Science, Technology and Engineering
http://repository.rongovarsity.ac.ke/handle/123456789/389
Wed, 30 Nov 2022 14:00:49 GMT2022-11-30T14:00:49ZComparative Analysis of Compressive Strength of Bamboo Leaf and Baggash Ash Concretes
http://repository.rongovarsity.ac.ke/handle/123456789/2406
Comparative Analysis of Compressive Strength of Bamboo Leaf and Baggash Ash Concretes
Shitote, Stanley
Billions tons of conventional concrete are produced yearly as well as cement which emit
large tons of carbon dioxide due to huge millions of metric tons produced annually. Sequel to
this, there is need to produce a sustainable product due to pollution from cement production,
using agricultural waste materials which have recently been found to be of great interest to
construction industries at large due to their ability to substituting cement will solve
environmental and pollution related issues. Bamboo leaf ash and baggash ash are produced as
a result of combustion which serves as supplementary cementitious materials and can be used
for construction purposes. This study determines the compressive strength of concrete
without ashes, bamboo leaf ash, and baggash ash concrete at varying percentage replacement
of 5%, 10%, 15%, 20% respectively. Physical test, workability test, compressive strength
test, and durability test was performed on concretes. A total of 138 cubes were produced
using 100*100*100 size cube cured at 7, 28, 56 and 90 days, of which 108 cubes were to
ascertain compressive strength for all the concretes, while 30 cubes were used for durability
test. Based on experimental results obtained, BLA surpassed BA concrete, and concrete
without ash in term of compressive strength at early and later age of curing using 10% as
optimum level of replacement, thus, one way ANOVA indicated, that BLA concrete is
statistically better than BA concrete and statistically the same at 56 and 90 days of curing for
conventional, BLA, and BA concrete. Furthermore, BLA and BA concretes reduced
durability. BA concrete increased the water absorption, permeable voids, and sorptivity. As a
result, BLA and BA can be considered as a good pozzolanic material which can save cost of
construction, improved concrete properties.
Fri, 01 Jan 2021 00:00:00 GMThttp://repository.rongovarsity.ac.ke/handle/123456789/24062021-01-01T00:00:00ZPredicament and Development Direction of Network Effectiveness Learning: Analysis and Research of Ergonomic Effectiveness
http://repository.rongovarsity.ac.ke/handle/123456789/2404
Predicament and Development Direction of Network Effectiveness Learning: Analysis and Research of Ergonomic Effectiveness
Annes, Philip
Human Factors and Ergonomics play a key role in the design and development of computer applications and tools. This is a
multidisciplinary approach used to ensure that systems and learning environments are designed to aid in user’s performance. This study
aimed at analyzing the human factors and ergonomics, their effects on the effectiveness of e-learning platform at Rongo University. A
descriptive research methodology was used to collect and analyze the data from a sample size of 150consisting of faculty and the
students. Using stratified sampling technique from five schools, a questionnaire was the main data collection tool and data was analyzed
using SPSS. It was observed that the level of e-learning platform at Rongo University is very low at less than 2%. The study found that,
psychological effects such as, motivation, individual perception, self-regulation, course content, computer literacy and lack of discipline
from the e-learning students, were the major contributing factors. Student and faculty correlated significantly with each other across
schools with course content being the main factor at a mean score of 8.60 for faculty and 21.40 for students. The Activity Theory has
been used as a theoretical background that guided the study.
Wed, 31 Aug 2022 00:00:00 GMThttp://repository.rongovarsity.ac.ke/handle/123456789/24042022-08-31T00:00:00ZModelling the Deflection of Reinforced Concrete Plates Using the Symplectic Method
http://repository.rongovarsity.ac.ke/handle/123456789/2358
Modelling the Deflection of Reinforced Concrete Plates Using the Symplectic Method
Shitote, Stanley; Saiyalel, Nakeel Matthew; Abuodha, Sylvester
This work aims to predict the flexural behavior of reinforced concrete slabs by combining a smeared finite element model
derived from fracture mechanics for the simulation of the decline in the flexural rigidity of the concrete, and the symplectic theory
of elasticity, which governs the bending of the structural element in question. Appropriate modifications have been carried out on
the smeared finite element model to better reflect the compressive behavior of concrete. The loading is incremental such that in
each load step, concrete behavior is treated as an elastic problem, and the response of the concrete slabs determined using the
symplectic method, which provides exact bending solutions to thin rectangular plates. For the validation of the model thus
proposed, congruent cases of concrete slabs in literature are studied. Evaluation of the results achieved from the proposed model
demonstrated relatively good predictability of reinforced concrete slabs in flexure.
Wed, 01 Jan 2020 00:00:00 GMThttp://repository.rongovarsity.ac.ke/handle/123456789/23582020-01-01T00:00:00ZOn class (n, mBQ) Operators
http://repository.rongovarsity.ac.ke/handle/123456789/2355
On class (n, mBQ) Operators
Obiero, Beatrice Adhiambo; Wanjala, Victor
In this paper, we introduce the class of (n, mBQ) operators acting on a complex Hilbert space H. An operator if T ∈ B (H) is said to belong to class (n, mBQ) if T ∗2mT 2n commutes with (T ∗mTn ) 2 equivalently [T ∗2mT 2n, (T ∗mTn)2] = 0, for a positive integers n and m. We investigate algebraic properties that this class enjoys. Have. We analyze the relation of this class to (n,m)-power class (Q) operators.
Sat, 26 Jun 2021 00:00:00 GMThttp://repository.rongovarsity.ac.ke/handle/123456789/23552021-06-26T00:00:00Z