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Articles 121 - 131 of 131
Full-Text Articles in Applied Mathematics
Optimum Design For Spring With Orthogonal Design Method, Han Fu - Jie
Optimum Design For Spring With Orthogonal Design Method, Han Fu - Jie
Tanzania Journal of Engineering and Technology (TJET)
Orthogonal design method is a sort of direct optimum method, by which the op- timal result may be obtained through simple computation and analysis. This method has gained increasingly extensive interest in scientific research, engineering design, end production management as well. The orthogonal table is the basic instrument for carrying out optimum design with orthogonal design method. It is a mathernatical table established On the basis Of the idea of isostatic distribution. As various levels may appear in any column, it makes a partial experiment contain levels of all factors furthermore. RII combina- tions of any two columns may appear …
Optimization Of Dispersed Flor Pond For Bacterial Removal, Mayo A. W
Optimization Of Dispersed Flor Pond For Bacterial Removal, Mayo A. W
Tanzania Journal of Engineering and Technology (TJET)
The design of waste stabilization ponds is seldom done with consideration of optimum pond dimensions. The analysis of pond dimensions within practical limits in dispersed flow ponds on the basis of minimum cost for the predetermined bacterial remova) ef ficiency, with the aid of computer is presented. The data collected in the pilot and full scale waste stabilization ponds at the University of Dar es Salaam Was used as input to the computer program. The results shows that pond configuration and climatic conditions which have influence on bacterial mortality rate have a re:narkable influence on pond cost
Hydrodynamic Stability Of The Breakwater Extension At Rrviksand, Norway, Alfonse Dubi
Hydrodynamic Stability Of The Breakwater Extension At Rrviksand, Norway, Alfonse Dubi
Tanzania Journal of Engineering and Technology (TJET)
The fishing port of Årviksand in Norway, which is situated on an open coast, is artificially harboured by breakwaters. The northern and southern breakwaters which were built in 1930—ies and 1950—ies respecti vely have been on several occasions damaged by heavy storms. This resul ted in the need for further protection by extending the northern breakwater. This paper describes one of the hydrodynamic tests on the breakwater extension. The breakwater, with a berm breakwater concept design, is subjected to the joint probability of sea level elevation and wave heights (in other 'fatigue" test). words , It is found that cover …
Control System Design Program Based On Cascade Compensation, Fredrick Ishengoma
Control System Design Program Based On Cascade Compensation, Fredrick Ishengoma
Tanzania Journal of Engineering and Technology (TJET)
CAD is becoming more widely accepted in the design and analysis of control systems. A program has been developed for analyzing single-input single-output linear time-invariant control system. The application of the progranl for frequency domain design of cascaded phase lead and phase lag coinpensators is briefly discussed. Two examples to illustrate the program are presented.
Evaluation Of Wind Data Records To Predict Extreme Extreme Wind Speeds In Tanzania, L Lwambuka
Evaluation Of Wind Data Records To Predict Extreme Extreme Wind Speeds In Tanzania, L Lwambuka
Tanzania Journal of Engineering and Technology (TJET)
The progress made towards evaluation of local wind data records to pred ict extreme values of wind speeds in Tanzania is being presented . Records of wind data, stored continuously since 18 years, have been compiled and statistically processed. Extreme value theory of Fisher —Tippet Type I has been fitted into the data to abstract extreme values of wind speeds for locations at which the wind data records were obtained. A reliable wind map of Tanzania containing basic wind speeds at 18 locations across the country has been produced. The basic wind speeds are being recommended for des ign against …
Flood Forecasting In Tanzanian Catchments, Omari Rumambo
Flood Forecasting In Tanzanian Catchments, Omari Rumambo
Tanzania Journal of Engineering and Technology (TJET)
Floods are still a problem to many countries in the world todate. Floods do cause damages to property and sometimes loss to human life. Flood control measures by structural and non—structural methods are avail able in the literature . However , structural flood control measures are financially infeasible in most developing countries today. Flood forecasting is a non—structural measure for reducing flood damages. It is a means of providing early The Li near f 1 ood warnings to flood prone areas . Perturbation Model has been appl ied for real time flood The Linear forecasting in Tan zanian catchments . …
The Hydraulic Performance Of A Vortex Tube Foector, F Mtaro
The Hydraulic Performance Of A Vortex Tube Foector, F Mtaro
Tanzania Journal of Engineering and Technology (TJET)
The vorle.r tube silt exrrac/or consists of a pipe, rhe crest of which has a slit and lies flush across lhe canal bed.With minimal warer loss, I.oe bedload is extracted through lhe slil settling canal back ro the river, thus reducing or eliminating the bedload transported in main canal. Ihe resulting swirling flow phenomena is of complex nature and depends on sc conirol paramerers, as a result of which previous empirical design approaches have yielded conflicting guidelines. By means Of a simplified hydraulic system, the flow mechanism and energy in rhe can be determined.
A Finite Element Analysis Of Wood In Transverse Compression, A Mrema
A Finite Element Analysis Of Wood In Transverse Compression, A Mrema
Tanzania Journal of Engineering and Technology (TJET)
A two dimensional finite element analysis is utilized to predict the stress and strain distributions for wood in transverse compression. Important key var iables are incorporated into the ana lysis to define their influence on the stress and strain distributions. These variables are geometry of loading, geometry of specimen and the orthotropic ratio of the material. Based on the finite element analysis results, relationships are arising stress from developed relat ing maximum stress concentrations to the above three variables. possible appl ications of the results from this study relate to the development of more efficient design of connections such as …
Experimental Investigations On The Behaviour Of Wood In Transverse Compression, A Mrema
Experimental Investigations On The Behaviour Of Wood In Transverse Compression, A Mrema
Tanzania Journal of Engineering and Technology (TJET)
Experimental investigations were done to study the behaviour of wood in transverse compress ion. Three key variables were incorporated in the experiments to study their influence on the •nriables were the orthotropic ratio of the behav iour. These material, the geometry of loading and that of the specimen . Deformation measurements were made at selected locations on test specimens by means of strain—gage based clip gages. Results from the experimental measurements were compared to previous deformation predictions made by a finite element analysis (9) . There is a very good agreement between measured values and those obtained trom the finite …
Numerical Investigation Of A Non-Newtonian Material Through A Sudden Pipe Expansion, V. G. Masanja
Numerical Investigation Of A Non-Newtonian Material Through A Sudden Pipe Expansion, V. G. Masanja
Tanzania Journal of Engineering and Technology (TJET)
A numerical method for solving two dimensional elliptic boundary-value problems of fourth order is used for finding stationary solutions of the equations of motion for a laminar flow through a sudden pipe expansion of an incompressible non-Newtonian fluid with a constitutive equation of the Reiner-Rivlin (R-R) type. Results for the Newtonian fluid, which is a special case, are in excellent agreement with those by previous investigators and they demonstrate the reliability, superiority and accuracy of the method. Results for the non-Newtonian cases could be of value for fixing ideas about visco-elastic behaviour although the R-R fluid allows only inelasticity: this …
The Mean Return Time To A State For A Markov Chain Representing In Telephone Conversations, M Luhanga
The Mean Return Time To A State For A Markov Chain Representing In Telephone Conversations, M Luhanga
Tanzania Journal of Engineering and Technology (TJET)
The mean return time to a state for a Markov chain representing N off-hook telephone conversations can be obtained by using ergodic flow rates [1] or renewal theory [2]. In this paper it is shown that the same result may be obtained by using no more knowledge of stochastic processes than the solution of time-homogeneous Chapman-Kolmogorov equations.