Journal Articles: Recent submissions
Now showing items 741-760 of 1026
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Antimicrobial Compounds from Terminalia brownii against Sweet Potato Pathogens
(Bentham Science Publishers, 2011)Phytochemical evaluation of Terminalia brownii extracts led to the isolation of five compounds namely - sitosterol, stigmasterol, monogynol A, betulinic acid and arjungenin. Their structures were established by spectroscopic ... -
A New Sterol Diglycoside from Conyza floribunda
(The South African Journal of Chemistry, 2009)Chemical investigation of CH2Cl2 and MeOH extracts of Conyza floribunda have led to the isolation of (24S)-ethylcholesta-5, 22E, 25-trien-3-O-glucosyl (1” 4’)-rhamnoside (1), (24S)-ethylcholesta-5,25-dien-3-O- -glucoside ... -
7a-Acetylugandensolide and antimicrobial properties of Warburgia ugandensis extracts and isolates against sweet potato pathogens
(Elsevier, 2011)7a-Acetylugandensolide together with thirteen known drimane-type sesquiterpenes have been isolated from Warbugia ugandensis bark extracts. Their structures were established by spectroscopic and physical methods as well as ... -
Development of a multiplex PCR technique for simultaneous detection of sweet potato feathery mottle virus and sweet potato chlorotic stunt virus
(Edizioni ETS Pisa, 2010)Virus diseases, especially those caused by mixed infections, are among the economically most devastating diseases of sweet potato. Sweet potato virus disease (SPVD), which is caused by mixed infection of Sweet potato ... -
Survey of sweet potato viruses in Western Kenya and detection of cucumber mosaic virus
(Journal of Plant Pathology, 2010)Sweet potato is an important food crop worldwide, but several pests and diseases limit its production. In eastern Africa, virus-induced diseases rank second to weevils in causing yield reduction. Symptomatic sweet potato ... -
Bacteriocins: Limiting Factors to Optimum Activity
(Science and Education Publishing, 2017)Bacteriocins are described as ribosomally synthesized antimicrobial peptides lethal to bacteria other than the producing strain. They are the most abundant of antimicrobial compounds produced by bacteria. These antimicrobial ... -
Critical environmental factors that influence the presence of vibrio cholera in the setting of Nairobi
(International Journal of Food Science and Nutrition, 2017-09)Cholera happens to be among the illnesses that are considered major public health threats owing to the numerous incidences of deaths that have resulted from it across the globe. This study aimed to investigate the critical ... -
Investigation on Optimal Cutting Parameters in Turning AISI 8660 Steel Using Silicon (Sic) Whisker Reinforced Ceramic Tool
(IOSR Journals, 2017-08)This research was to investigate the effects of process parameter that is cutting speed, feed rate, depth of cut and machining time on the response variables in turning AISI 8660 material using whisker reinforced ceramic ... -
Effects of Career Stagnation on Performance in Public Service: A Case of Murang’a County Government
(IJSR, 2015)Devolution is generally defined as a process of transfer of political, administrative and fiscal management powers between central government and lower levels of government, primarily operating at city and region levels ... -
Computer Laptop Project Strategy for Basic Education Schools in Kenya
(IJICT Journals, 2017-05)Kenya’s Vision 2030 recognizes the enabling role of Information and Communication Technology (ICT) and anchors some of its key aspirations upon the availability and adoption of computers for schools. The overall objective ... -
Voltage profile improvement using switched capacitors: case of single wire earth return distribution network
(2017)Most rural areas in Africa are characterized by scattered villages with a very low demand in electricity. Due to improper planning and lack of knowledge on low cost technologies, the cost of extending the grid to supply ... -
Development of a Wavelet-ANFIS based fault location system for underground power cables
(2017)In the past decade, electricity demand has increased rapidly in metropolitan areas. All over the world, large scale underground power cable installations networks are replacing overhead transmission lines due to environmental ... -
Assessment of VSC-HVDC system for transient stability improvement of a power system with large wind power injection.
(2016)This paper analyzes Power System Transient Stability Improvement through a Voltage Source Converter High Voltage Direct Current (VSC-HVDC) system with Large Wind power injection. The modern large wind farms and other ... -
Wider range of tuning the proposed VSC-HVDC system for improved controller performance
(2016)Tuning of the Voltage Source Converters, High Voltage Direct Current (VSC-HVDC) controllers is a critical undertaking continuously carried out in power system operation to ensure system stability is kept under control ... -
Optimal under frequency load shedding using CUCKOO search wirh levy flight algorith for frequency stability improvement.
(2015)Frequency stability in a power system is very important as it determines the synchronous speed of electrical machines. Therefore it should remain within acceptable limits even when the system is disturbed. In order to ... -
Power output maximization of a PMSG based standalone wind energy conversion system using fuzzy logic
(2016)This paper proposes a Fuzzy Logic Controller for Maximum Power Point Tracking of a case study wind energy conversion system (WECS).The system consists of a standalone fixed pitch, variable speed wind turbine directly coupled ... -
Optimal under-voltage load shedding using cuckoo search with levy flight algorithm for voltage stability improvement
(2015)Voltage stability has become a serious threat of modern power system operation nowadays. To tackle this problem properly, load shedding is a countermeasure taken as a last resort. However, its consequences might result in ... -
Optimal siting and sizing of single SPV system in radial distribution network for loss reduction based on maximum power saving technique
(2016)This paper presents the optimal placement of aSPV (Solar Photovoltaic) system in thedistribution system using the backward and forward sweep method based on the analytical maximum power saving technique for the maximum ... -
Modelling and loading limits for kenya coast power network using continuation power flow
(2016)Shore to ship power connection for docked ship has recently been applied as one way of limiting pollution in ports. This paper studies the effect that a shore to ship connection at the port of Mombasa would have on the ... -
Voltage stability improvement on optimal placement of facts devices
(2016)Voltage stability challenge in power systems remains one of the major concerns in system planning and operation. The ability of a power system to maintain acceptable voltage levels at all buses in the system under normal ...
