Browsing by Author "Msambichaka, Joseph J."

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    Estimation of Extreme Flows in Nkana River to Verify the Adequacy of Naming’ongo Bridge Waterway.
    (ScientificResearch, 2012-12-26) Katambara, Zacharia; Msambichaka, Joseph J.; Mkisi, Joseph
    The response by the government of Tanzania to food security and poverty alleviation in the Naming’ongo area in Mbozi District has been to develop Naming’ongo irrigation scheme as well as construct a bridge across River Nkana to con- nect the farms and other parts of the district to facilitate a reliable transportation of the produce to the market. The Aus- tralian Water Balance Model was calibrated by using 10 years data from a nearby sub-catchment of Mbarali. The Nam- ing’ongo Sub-catchment was delineated form a 30 m digital elevation model. The observed rainfall was obtained from Mbozi Meteorological station. The study approximated the peak flows in River Nkana for a return period of 50 years to be slight above 560 m3/s. This was considered to be adequate for the proposed structure. The study recommends that when undertaking human activities such as deforestation and cultivation an account for soil and environmental conser- vation should be considered. While it is necessary to establish a monitoring system within the catchment, the designs of future hydraulic structures should incorporate stream flow measuring facilities.
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    Estimation of Extreme Flows in Nkana River to Verify the Adequacy of Naming’ongo Bridge Waterway.
    (Scientific Research, 2013-02-05) Katambara, Zacharia; Msambichaka, Joseph J.; Mkisi, Joseph
    The response by the government of Tanzania to food security and poverty alleviation in the Naming’ongo area in Mbozi District has been to develop Naming’ongo irrigation scheme as well as construct a bridge across River Nkana to connect the farms and other parts of the district to facilitate a reliable transportation of the produce to the market. The Australian Water Balance Model was calibrated by using 10 years data from a nearby sub-catchment of Mbarali. The Naming’ongo Sub-catchment was delineated form a 30 m digital elevation model. The observed rainfall was obtained from Mbozi Meteorological station. The study approximated the peak flows in River Nkana for a return period of 50 years to be slight above 560 m3 /s. This was considered to be adequate for the proposed structure. The study recommends that when undertaking human activities such as deforestation and cultivation an account for soil and environmental conservation should be considered. While it is necessary to establish a monitoring system within the catchment, the designs of future hydraulic structures should incorporate stream flow measuring facilities.
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    Investigation Of Properties Of Mbeya Pumice Lightweight Aggregate
    (JOURNAL OF THE INSTITUTION OF ENGINEERS TANZANIA, 2021-12) Shiganza, Oscar J.; Mboya, Hieronimi A.; Msambichaka, Joseph J.
    The properties of concrete depend partly on the type and mechanical properties of aggregates used in the concrete mix. The paper presents an investigation designed to study the properties of pumice lightweight aggregates and assess their suitability to structural lightweight concrete. The properties of pumice lightweight aggregates mainly aggregates shape, water absorption, specific gravity and organic impurities were examined. The results indicated that pumice lightweight aggregates have the flakiness and elongation close to upper limits as set by BS 812-105.1:1989 low density, high water absorption in comparison to normal weight aggregates, and are weather resistant. It was concluded that pumice lightweight aggregates are suitable for manufacture of structural lightweight concrete.
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    Validation of the Developed Structural Equation Model onFactors Influencing Artisans' Performance in Tanzanian Building Construction Projects
    (MUST Journal of Research and Development, 2023) Shengeza, Japhary J.; Msambichaka, Joseph J.; Mwishwa, Yazid H.
    Artisans are key players in the construction industry. Artisans, in conjunction with other players, are responsible for turning drawings into tangible structures using materials and equipment. However, several reports suggest that their performance is inadequate, attributing it to poor workmanship and productivity. This study explores the influencing factors (IFs) for artisan performance and how disregarding these IFs leads to poor performance through the development of structural equation modelling (SEM). The study focuses on validating the developed SEM on IFs categorised as informal training factors (IF), motivational factors (MF), qualification factors (QF), and formal training factors (FF) and their impacts regarding achievements of workmanship and productivity by artisans when disregarded. The study validates the SEM model using a questionnaire distributed among construction industry experts. The study results demonstrate that disregarding IFs has a high, negative impact on artisan performance. Specifically, IF was found to have the most significant effect on artisan performance when ignored, with a mean score of 4.09, followed by MF = 4.00, Q = 3.82, and FF = 3.55. In the case of the model's applicability, effectiveness, and adaptability, the mean scores were 4.00, 3.55, and 3.45, respectively, indicating that the construct depicted in the model is highly applicable. The study concludes that considering IFs for artisan performance is crucial for addressing the root causes of poor performance and improving project success in the construction industry