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Articles 931 - 951 of 951
Full-Text Articles in Entire DC Network
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 Use Of Rainfall Patterns In Predicting Population Densities Of Multimammate Rats, Mastomys Natalensis, H. Leirs, R. Verhagen, W. Verheyen
The Use Of Rainfall Patterns In Predicting Population Densities Of Multimammate Rats, Mastomys Natalensis, H. Leirs, R. Verhagen, W. Verheyen
Vertebrate Pest Conference Proceedings: 14th (1990)
During 3 years we studied a population of multimammate rats, Mastomys natalensis (Smith 1834), in Morogoro, Tanzania. Data were collected in both removal and capture-recapture schemes. We present evidence that patterns of growth and reproduction were related to onset and abundance of rains. This partially explains differences in densities. Additionally, we investigated available literature data and related them with climatological data. A scenario is presented which enables us to predict how densities of multimammate rats may evolve in the following year and whether there will be a risk of outbreaks. The use and implications of this scenario in planning control …
Rodent Control In East Africa, William R. Smythe
Rodent Control In East Africa, William R. Smythe
Vertebrate Pest Conference Proceedings: 12th (1986)
The nations of East Africa consist of Ethiopia, Somalia, Kenya, Uganda, Tanzania, Malawi, Mozambique and Zimbabwe. They encompass a widely varied topography, from coral strands to snow-capped mountains, rain forests to deserts, and tropical to temperate. In all these areas where soil and rainfall patterns permit, agricultural crops are grown. For the most part farming is of a subsistence nature being small single family plots. These farms make up to 90% of the farming in most of the East African nations. There are large farms in Kenya and Zimbabwe generally confined to the temperate uplands. Elsewhere there are large government …
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.
Reduced Set Of Phages For Typing Salmonellae, Melvin Gershman, George Markowsky
Reduced Set Of Phages For Typing Salmonellae, Melvin Gershman, George Markowsky
Computer Science Faculty Research & Creative Works
A set composed of 27 phages is described for differentiating Salmonella spp. representative of groups A, B, C1, C2, D1, D2, E1, E2, E3, E4, G1, K, and N. All of the 1,245 cultures used in this effort were typable and were differentiated on the basis of the 420 phage patterns observed. All results were reproducible. Characteristic phage patterns were produced by a variety of Salmonella serovars isolated from campus incidents and a number of hospital, family, restaurant, and processing plant outbreaks …
The Influence Of Salinity On Larval Development And Population Dynamics Of Anopheles Merus Dönitz (Diptera: Culicidae), F. W. Mosha, C. M. Mutero
The Influence Of Salinity On Larval Development And Population Dynamics Of Anopheles Merus Dönitz (Diptera: Culicidae), F. W. Mosha, C. M. Mutero
All Peer-Reviewed Publications
Variations in density of adults of Anopheles merus Dön. in Jimbo Village on the Kenya Coast were found to be correlated both with rainfall and with salinity at their breeding sites. Densities started to increase at the beginning of the rains when several breeding sites were formed. This was followed by a decline in numbers resulting mainly from the decrease in salinity in the semi-permanent breeding sites. A second rise occurred after the end of the rains, corresponding with an increase in salinity in the semi-permanent breeding sites due to evaporation. Peak density coincided with salinities of 30–50% sea water …
On The Field-Induced Infra-Red Absorption Of Gaas, Frederick Ngawo Onyango
On The Field-Induced Infra-Red Absorption Of Gaas, Frederick Ngawo Onyango
Tanzania Journal of Science
A theoretical survey of electric field–induced effects on one-and two-phonon absorption of GaAs is presented. The eigen-values and hence eigen-vectors are calculated for an external field applied along [001] and dependence of electro–absorption on the direction of radiation polarization established.
Trials With Trickle Irrigation Equipment At Morogoro Preliminary Report, M.E. Parkes, M. E. Madata
Trials With Trickle Irrigation Equipment At Morogoro Preliminary Report, M.E. Parkes, M. E. Madata
Tanzania Journal of Science
The use of trickle irrigation is discussed with reference to Tanzania. A split-split plot design experiment is described in which yields of tomato, onion, and cabbage are compared for trickle and hand-irrigated plots, with different levels of fertiliser treatment. Yields for trickle-irrigated plots were significantly greater only for tomatoes. These results were achieved during July to October and a second attempt to grow the same vegetables during December to March was unsuccessful. Further trials are required to obtain a suitable rotation of vegetable crops from both a nutritional and agronomic point of view. Experience with the trickle irrigation equipment is …
Theoretical Evaluation Of Selective Radiation–Absorbing Surface, K.R. O’Shea
Theoretical Evaluation Of Selective Radiation–Absorbing Surface, K.R. O’Shea
Tanzania Journal of Science
An algol computer program is described, by means of which the spectral reflectivity for any angle of incidence may be calculated for a surface consisting of up to two thin absorbing films on a bulk substrate. The values of optical constant, n and k, for the materials used and also the thickness of the films, are the only data required. Calculated reflectivities have been shown to be consistent with experimental results.
The Geometry Of Commutative Symmetric Loops, Hussein M. Karanda
The Geometry Of Commutative Symmetric Loops, Hussein M. Karanda
Tanzania Journal of Science
The aim of this paper is to show the connection existing between a commutative symmetric loop and an euclidean space.
The Separation And Analysis Of Titanium And Iron In The Mineral Ilmenite, Adolf M Mulokozi
The Separation And Analysis Of Titanium And Iron In The Mineral Ilmenite, Adolf M Mulokozi
Tanzania Journal of Science
Since the location of extensive *ilmenite-bearing beach sands in Australia, and now in Tanzania, the separation and analysis of the mineral has become more important than ever. This is particularly because ilmenite has now become the principal source of rutile, an important product in the manufacture of pigments and ceramic materials. Ion exchange separation using a mixture of HCI and HF is described in the literature. The method has serious limitations especially when the use of glassware cannot be avoided. The author has successfully applied exclusively HCI solution for the anion exchange separation. The mineral was first brought in solution …
Electrochemical Machining (Ecm) With Alternating Current, S. J. Shine
Electrochemical Machining (Ecm) With Alternating Current, S. J. Shine
Tanzania Journal of Science
Electrochemistry has had several practical uses in industry for a long time; but one of the more recent applications is the machining of metals. Direct current ECM has been applied in industry for the last two decades. However, ECM with alternating current is still in the early stage of research and development. This paper shows that ECM with normal a.c supply is feasible and practicable if special tools are used. ECM with d.c. is first introduced to provide a better insight for the machining with a.c.
The Geometry Of Symmetric Loops, Hussein M. Karanda
The Geometry Of Symmetric Loops, Hussein M. Karanda
Tanzania Journal of Science
This paper is intended to deal with the geometry of locally analytic loops. In it we will show which loops generate symmetric spaces, the connection between the constructions of Sabinin and Loos, and examples of symmetric loops. The main results of these articles were published in 1972 (Karanda 1972).
An Iteration Formula For Finding Roots Of Equations, R. W. P. Masenge
An Iteration Formula For Finding Roots Of Equations, R. W. P. Masenge
Tanzania Journal of Science
We seek the roots of the equation f(x) = 0.
Studies In Artificial Rain: Their Progress And Prospects, P. B. Vitta
Studies In Artificial Rain: Their Progress And Prospects, P. B. Vitta
Tanzania Journal of Science
The progress made by studies of the phenomenon of rain is reviewed. Several techniques for modifying clouds so as to accelerate rain-drop precipitation are described.
The Kunduchi Mangrove Basin, Alison Mccusker
The Kunduchi Mangrove Basin, Alison Mccusker
Tanzania Journal of Science
The pattern of tidal submergence and exposure in the Kunduchi mangrove basin is determined by contour mapping and by relating the contours to published tide predictions. Salinity of the creek effluent is measured at spring and neap tides in both wet and dry seasons. The vegetation of the basin, up to the highest high water level, is described briefly.
An Attempt To Control Boundary Layer Turbulence With Nonisotropic Compliant Walls, R. Grosskreutz
An Attempt To Control Boundary Layer Turbulence With Nonisotropic Compliant Walls, R. Grosskreutz
Tanzania Journal of Science
A review of turbulence production in boundary layers leads to a new approach to boundary layer control by means of nonisotropic compliant walls. Suitably constructed coatings were tested and demonstrate that the concept is basically valid.
The Role Of F.A.O. In Vertebrate Pest Problems, H.R. Shuyler
The Role Of F.A.O. In Vertebrate Pest Problems, H.R. Shuyler
Vertebrate Pest Conference Proceedings: 6th (1974)
Since 1947, when FAO began its involvement in vertebrate pest problems, its role has gradually expanded. Through short-term Consultants, Experts, Regional and Headquarters Officers, it advises Member Countries about vertebrate pest control needs and opportunities, fulfills requests for assistance suggesting needed modifications, and guides and reports on assistance rendered. Assistance may involve one or more international specialists for a few weeks up to national and regional projects of several years' duration. In cooperation with WHO it sponsors meetings of specialists, develops rodenticide specifications for international commerce, and has published rodent bibliographies covering 1950 to 1969.
Elements Of Tanzanian Coastal Planning, James J. Griffin
Elements Of Tanzanian Coastal Planning, James J. Griffin
Marine Affairs Theses and Major Papers
The purpose of this paper is to examine aspects of a Coastal Zone Plan as it applies to the Republic of Tanzania with its differences from and similarities to, the United States coastal zone planning experience. Possibly, as a result, some feeling for the problem of organizational concepts and approaches, as well as the current need for Tanzanian coastal zone management will emerge.
External States And The Indian Ocean: The Potential For Confrontation, James P. Cartwright
External States And The Indian Ocean: The Potential For Confrontation, James P. Cartwright
Marine Affairs Theses and Major Papers
A study of the common interests of internal and external states in the Indian Ocean and identification of the methods, and their potential for confrontation, employed by external powers in pursuit of their interests. The historical interests of external powers in the Indian Ocean are depicted. Common interests, which have commanded the attention of internal states and external powers during recent years, are identified. The Indian Ocean is divided into five regions, each region characterized by the aforementioned common interests. The assets, mutual relations and interests of the littoral states comprising each region are described. The interests and methods of …
The Monadnock Volume 44, June 1970, Clark University Geographical Society
The Monadnock Volume 44, June 1970, Clark University Geographical Society
The Monadnock (Clark Geographical Society)
Volume 44 of The Monadnock. The Monadnock was the alumni magazine of the Clark University Geographical Society (1927-1985) (2014-present).