african drylands institute for sustainability

UNIVERSITY OF NAIROBI

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African Drylands Institute for Sustainability
College of Agriculture and Veterinary Science
University of Nairobi
P.O. Box 29053 00625
Nairobi , Kenya

Email:adis@uonbi.ac.ke /csdes@uonbi.ac.ke
Tel: 254-020-2133086
Fax: 254-020-632121

ADIS Participates in the 2018 Kenya Pastoral Week hosted by Kajiado County

UoN Open Day

Kibwezi tree Planting- Mr. Katuva

Kibwezi rangeland reseeding

2nd Annual Rangeland Congress 2016

The National level paper presentation seminar on Early warning and food security forum

Pasture Week in Marsabit County

The pasture week aimed to inaugurate pasture production demonstrations- land preparation and broadcasting of the grass seeds

Fodder Production Training

Farmers learning to construct a semi-circular band, a micro-structure for rainwater harvesting and conservation in Wajir County

Climate Change Adaptation Workshop

National Dialogue on Policy Frameworks for Climate Change Adaptation, Disaster Risk Reduction, and Rangeland Management and Governance in Kenya’s Rangelands

CSDES LAUNCHES THE GEOGRAPHIC INFORMATION SYSTEMS (GIS) LAB AT CAVS, UoN.

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Publications

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Prof. Mutuli Stephen M. Publications
1	2013	Variability Of Fatigue Strength And The Effect Of Heat On Properties Of Reinforcing Steel Bars Made From Local Scrap Click to View Abstract No Abstract!
2	2013	Analysis Of The Single Toggle Jaw Crusher Kinematics Click to View Abstract No Abstract!
3	2013	Characterization Of The Mechanical Properties Of Reinforcing Steel Bars Produced From Scrap Metals : Case Study Of Kenya Steel INDUS Click to View Abstract No Abstract!
4	2013	Development Of An Experimental Rig For A Two-dimensional Stress And Strain Analysis Laboratory Experiment Click to View Abstract No Abstract!
5	2013	A Dislocation Density Evolution Model Of Metal Plasticity Click to View Abstract No Abstract!
6	2013	The Interfacial Bond Strength Of Sisal Fibre Reinforced Rice Husk Ash Cement Composite Click to View Abstract No Abstract!
7	2012	Advanced Topics In Solid & Structural Mechanics Click to View Abstract No Abstract!
8	2012	Fundamentals Of Solid And Structural Mechanics An Introduction To The Mechanics Of Elastic Deformation Of Structural Components Click to View Abstract No Abstract!
9	2012	An Intrinsic Dislocation Density – Finite Element Formulation Of Metal Plasticity Click to View Abstract A computational model was developed to simulate elastic and plastic behavior in Body Centered Cubic (BCC) metals and alloys. The model provided for simultaneous simulation of the micro and macro length scales and used periodicity to link the two length scales. The model was implemented in a 3dimensional framework giving rise to a finite element technique incorporating intrinsic dislocation information in the simulation of the material’s behavior. The technique was validated by simulating loading over the elastic range and the immediate region beyond yield, of thin steel strips, and comparing the results to those obtained by conventional analysis. Stress-strain curves and slip plane percentage contribution factors were generated. Specifically the stress-strain curves generated upheld Hooke’s law and demonstrated a definite yield plateau followed by material recovery after yielding.
10	2011	Boiler, Piping And Pressure Vessel Cross-Bore Design Stresses A Quick Design Approach Click to View Abstract No Abstract!
11	2011	A Survey Of Ultrasonic Waves In Powder Transportation Click to View Abstract No Abstract!
12	2011	Determination Of Resonant Frequency Of A Piezoelectric Ring For Generation Of Ultrasonic Waves Click to View Abstract Ultrasound technology has become an important aspect in material handling and machining. Standing and traveling ultrasonic waves have been applied in powder transportation, feeding, dosing and supply of small amounts of powder with high quantitative accuracy and precision. Piezoelectric actuators are the most commonly used to generate the ultrasonic waves in various devices. Hence, these devices have presented a unique, economic and simple means of accurate handling of powder. This paper describes the determination of the resonant frequency of a piezoelectric ring that can be applied for generation of the ultrasonic waves. The resonant frequency is important in determining the highest amplitude of the vibration of the ring.
13	2011	Optimal Placement Of A Piezoelectric Ring In An Ultrasonic Powder Transport System Click to View Abstract No Abstract!
14	2006	KIHIU J, RADING G.O, MUTULI S.M "Universal SCFs And Optimal Chamfering In Cross - Bored Cylinder" Accepted For Publication In The "International Journal Of Pressure Vessels And Piping". 2006 Click to View Abstract No Abstract!
15	2006	"Universal SCFs And Optimal Chamfering In Cross - Bored Cylinder Click to View Abstract No Abstract!
16	2006	Overstrain In Flush Optimal-chamfered Cross-bored Cylinders Click to View Abstract No Abstract!
17	2004	Effect Of Heat On Microstructure And Mechanical Properties Of Reinforcing Steel Bars Click to View Abstract No Abstract!
18	2004	Transition, Coverage And Constancy In Radiused Entry Cross-Bored Cylinders Click to View Abstract No Abstract!
19	2003	Stress Characterization Of Autofrettaged Thick-walled Cylinders Click to View Abstract No Abstract!
20	2003	Geometric Constants In Plain Cross-bored Cylinders Click to View Abstract A three-dimensional FEM computer program was developed to establish the stress distributions and SCFs in thick walled cylinders with flush and nonprotruding plain cross bores under internal pressure. The displacement formulation and eight-noded brick isoparametric elements were used. The Frontal solution technique was used due to the limited computing facilities. In the far field, the FEM stresses and displacements were in good agreement with the through thickness analytical values. The variation of SCF with d was established for various thickness ratios. For k> 1.25, the maximum hoop stress occurred away from the crotch corner when d≤0.2. For k=1.25, the maximum hoop stress occurred away from the crotch corner when d≤0.15. For k≥1.75, d was found to be a geometrical constant equal to 0.2 where the k values have a SCF of 2.734. For k
21	2000	Interfacial Bond Strength For Sisal 4 Fibre Composite Click to View Abstract No Abstract!
22	1998	Time And Space Management In Structural Analysis Problems Click to View Abstract No Abstract!
23	1997	An Investigation Of The Mechanical Properties Of Sisal Fibre, Loofah Matt And Their Composites With Epoxy Resin Click to View Abstract The mechanical properties of sisal fibre, loofah matt, epoxy resin and their resulting composites were determined experimentally. The influence of volume fraction of the reinforcing fibres and matt on the mechanical properties of the composites was investigated. It was found that loofah matt reduces the mechanical properties of epoxy resin and as such loofah is not a suitable reinforcing material. Sisal fibre on the other hand does improve the mechanical properties of epoxy resin; the improvement being dependent on fibre volume fraction. This makes fibre reinforced composites useful practical materials. Based on the “effective reinforcement” and the advent of multiple matrix fracture, design limitations for the composites were set.
24	1995	Determination Of Interfacial Bond Strength Of Sisal Fibre Reinforced Epoxy Composites Click to View Abstract No Abstract!
25	1988	Velocity Fields In Grease Lubricated Contact Click to View Abstract No Abstract!
26	1986	Determination Of Velocity Fields In Newtonian And Non- Newtonian Lubricating Films Click to View Abstract No Abstract!
27	1984	Velocity Measurements In The Inlet Zone Of A Hydrodynamic Contact Click to View Abstract No Abstract!
28	1983	Mesure Et Analyse Des Champs De Vitesse A’ L’entrée D’un Contact Lubrifie Entre Deux Cylindres Click to View Abstract No Abstract!
29	1982	MUTULI S.M; BESSELL T.J And TALITWALA E.S.J "The Potential Of Sisal As A Reinforcing Fibre In Cement Base Materials" African Journal Of Science And Technology (ANSTI) Vol, No. 1 Pp. 5 - 16, April 1982. Click to View Abstract No Abstract!
30	1982	MUTULI S.M; BESSELL T.J And TALITWALA E.S.J "The Potential Of Sisal As A Reinforcing Fibre In Cement Base Materials" African Journal Of Science And Technology (ANSTI) Vol, No. 1 Pp. 5 - 16, April 1982. Click to View Abstract No Abstract!
31	1982	The Interfacial Bond Strength Of Sisal- Cement Composites Using A Tensile Test Click to View Abstract No Abstract!
32	1979	MUTULI S.M; "The Properties Of Sisal Fibre And Sisal Fibre Reinforced Composite Materials" M.Sc. Thesis, University Of Nairobi - Kenya, 1979. Click to View Abstract No Abstract!
33	1979	MUTULI S.M; "The Properties Of Sisal Fibre And Sisal Fibre Reinforced Composite Materials" M.Sc. Thesis, University Of Nairobi - Kenya, 1979. Click to View Abstract No Abstract!