Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2431 - 2460 of 6161

Full-Text Articles in Entire DC Network

Mycoplasma Co-Infection Is Associated With Cervical Cancer Risk, Cameron Klein, Kandali Samwel, Crispin Kahesa, Julius Mwaiselage, John T. West, Charles Wood, Peter C. Angeletti Jan 2020

Mycoplasma Co-Infection Is Associated With Cervical Cancer Risk, Cameron Klein, Kandali Samwel, Crispin Kahesa, Julius Mwaiselage, John T. West, Charles Wood, Peter C. Angeletti

Nebraska Center for Virology: Faculty Publications

Tanzania faces one of the highest cervical cancer burdens in the world. Recent work has suggested that the bacterial family Mycoplasmataceae is associated with higher levels of human papillomavirus (HPV), human immunodeficiency virus (HIV), and pre-cancerous cervical lesions. Mycoplasmataceae infection in Tanzania is not well understood, especially when considering the differences between sexually transmitted species of Mycoplasmataceae. To establish the prevalence of common Mycoplasmataceae cervical infections and evaluate their relationship with risk factors for cervical cancer, 1160 Tanzanian women responded to an epidemiological questionnaire and were tested for HIV, HPV, cervical lesions, Mycoplasma genitalium, Mycoplasma hominis, Ureaplasma spp., and Lactobacillus …

Go to article

Methodology For Quantifying Resiliency Of Transportation Systems, Hannah Rose Russell Jan 2020

Methodology For Quantifying Resiliency Of Transportation Systems, Hannah Rose Russell

Doctoral Dissertations and Master's Theses

The National Science Foundation’s definition of resiliency is “the ability to prepare and plan for, absorb, recover from, or more successfully adapt to actual or potential adverse events” (National Science Foundation, 2016). While this definition is informative and useful, it lacks a quantitative reference. There is a need for a method of quantifying resilience to better plan and prepare for system wide disruptions. The research effort described herein provides a quantifiable measures of system resiliency, consistent with NSF’s definition. Fundamentally, a system disruption can be partitioned into five distinctive states: the stable pre-event state, the absorption state, the disrupted state, …

Go to article

Comprehensive Sex Education To Improve Sexually Transmitted Infection And Disease Knowledge Base And Decision Making In Adolescents, Mckenzie Terfehr Jan 2020

Comprehensive Sex Education To Improve Sexually Transmitted Infection And Disease Knowledge Base And Decision Making In Adolescents, Mckenzie Terfehr

Doctor of Nursing Practice (DNP) Practice Innovation Projects

Introduction: Developing intimate relationships are a normal part of transitioning through development. The United States continues to see increasing numbers of sexually transmitted infections (STIs) and sexually transmitted diseases (STDs), mostly in adolescents and young adults. Initiation of comprehensive sexual health education in schools can help protect young adolescents by arming them with information to make informed choices and reduce exposure risk to STIs/STDs.
Methods: The review of literature focused on impacts that positively affected adolescents and their ability to competently protect themselves and others following sex education. Databases searched included PubMed, Medline, PLOS ONE, National Institutes of Health (NIH) …

Go to article

Awareness And Use Of Electronic Information Resources By Students In Nigeria Polytechnics, Bello Sani Manzo, S. Kannan Jan 2020

Awareness And Use Of Electronic Information Resources By Students In Nigeria Polytechnics, Bello Sani Manzo, S. Kannan

Library Philosophy and Practice (e-journal)

The study examines student’s familiarity and extent of using electronic information resources in the polytechnic libraries of Nigeria. The rationale for the study was inform by the paucity of research on e-resources usage among students in polytechnics, particularly in Nigeria. The specific objectives were to identify the types of e-facilities and the availability of e-resources, students level of familiarity, the extent of use, and the purpose of utilizing the e-resources. The study employed a descriptive survey research design. Questionnaires and interviews were used as data collection instruments. the population of the study consists of regular students from 12 polytechnics in …

Go to article

Impact Of Ict On Learning Activities Of User By Academic Library Services: A Literature Review, Neha Lata, Sharad Kumar Sonkar Jan 2020

Impact Of Ict On Learning Activities Of User By Academic Library Services: A Literature Review, Neha Lata, Sharad Kumar Sonkar

Library Philosophy and Practice (e-journal)

This study has been conducted for literature review on Impact of ICT on learning activities of users by Academic library services. The study focuses on the technology utilized in Academic libraries and impact on discovering how ICT keeps on advancing, and as it does it is turning out to be increasingly more incorporated with students and researcher learning. Brilliant machines and voice-controlled aides are only two instances of how technology is developing to make students' careers simpler. This study explains how technology changes the manner in which library services work and it additionally influences the way learning exercises of users.

Go to article

Prevalence Of Overweight/Obesity, Anaemia And Their Associations Among Female University Students In Dubai, United Arab Emirates: A Cross-Sectional Study, Haleama Al Sabbah Jan 2020

Prevalence Of Overweight/Obesity, Anaemia And Their Associations Among Female University Students In Dubai, United Arab Emirates: A Cross-Sectional Study, Haleama Al Sabbah

All Works

© The Author(s), 2020. Published by Cambridge University Press on behalf of The Nutrition Society. The present study assessed the associations of overweight, obesity and anaemia with selected lifestyle factors, total body fat and abdominal obesity among female university students in Dubai. A total of 251 female students from a national university in Dubai participated in the present study. Weight, height, waist circumference, Hb level and total body fat percentage were measured. Participants also completed a self-reported questionnaire that included items related to the factors of obesity, anaemia and lifestyle. The study was approved by the University Ethical Committee. Almost …

Go to article

Use Of Web Resources And Services By The Research Scholars In The Field Of Social Sciences Of Selected Central Universities (Du, Bhu, Amu, Jnu), Utkarsh Dwiwedi, Rajani Mishra (Associate Professor) Jan 2020

Use Of Web Resources And Services By The Research Scholars In The Field Of Social Sciences Of Selected Central Universities (Du, Bhu, Amu, Jnu), Utkarsh Dwiwedi, Rajani Mishra (Associate Professor)

Library Philosophy and Practice (e-journal)

The current study was conducted with the objective to study the usage of Web Resources and services by the Researchers in the field of social sciences of selected Central Universities (DU, BHU, AMU, JNU). A well-structured questionnaire was directed through irregular testing strategy to the Research Scholars of the Institutes to gather the information with respect to the utilization of Web Resources. This paper confines the investigation only to utilization of Web Resources by Researcher of Language and Literature in selected Central Universities (DU, BHU, AMU, JNU). The extent of the examination can be stretched out to former Indian Universities …

Go to article

Integrated Mobile And Web-Based Application For Enhancing Delivery Of Hiv/Aids Healthcare Information In Tanzania, Ibrahim Mwammenywa Dec 2019

Integrated Mobile And Web-Based Application For Enhancing Delivery Of Hiv/Aids Healthcare Information In Tanzania, Ibrahim Mwammenywa

Tanzania Journal of Engineering and Technology (TJET)

This study aims to develop an integrated e-health platform for enhancing delivery of HIV/AIDS healthcare information in Tanzania, which consists of a mobile application and a web-based system. The study is based on the system's functional and non-functional requirements for an e-health system for delivery of HIV/AIDS healthcare information. The Rapid Application Development (RAD) model was adopted during the system development. The system requirements were modelled into Data Flow Diagram (DFD) in order to obtain the clear flow of the HIV/AIDS healthcare information between the clients and HIV/AIDS healthcare practitioners. With the use of different software development tools and environment …

Go to article

Land Use/Cover Change And Their Impacts On Streamflow In Kikuletwa Catchment Of Pangani River Basin, Tanzania, Upendo Msovu Dec 2019

Land Use/Cover Change And Their Impacts On Streamflow In Kikuletwa Catchment Of Pangani River Basin, Tanzania, Upendo Msovu

Tanzania Journal of Engineering and Technology (TJET)

Streamflow perturbation is highly prevalent in Kikuletwa catchment. However, little is known concerning land use/cover change (LULCC) with regard to streamflow perturbation in the catchment. This study aims to detect the historical and predict future LULCC and assess their impacts on streamflow amounts using the Soil and Water Assessment Tool (SWAT) model. Supervised classification of Landsat imagery data for 1985, 2000 and 2015 years was done in ERDAS 14 Imagine software. Future prediction of LULCC was done using Module for Land Use Change Evaluation (MOLUSCE) tool, a QGIS plug-in. An accuracy ranging from 79% to 82% was obtained for all …

Go to article

The Potentials Of Faecal Sludge Treatment Using Local Conditioners In Tanzania: A Review, Doglas Benjamin1 Dec 2019

The Potentials Of Faecal Sludge Treatment Using Local Conditioners In Tanzania: A Review, Doglas Benjamin1

Tanzania Journal of Engineering and Technology (TJET)

Worldwide, every day human beings generate millions of tons of Faecal Sludge (FS), which is rich in water, nutrients, energy, and organic compounds. Yet FS is not being managed in a way that permits us to derive value from its reuse, while at the same time, millions of farmers struggle with depleted soils and lack of water. In most of the developing countries, energy for cooking is mainly derived from cutting of trees, either as wood or charcoal. Resource recovery and reuse from FS can create livelihoods, enhance food security, support green economies, reduce waste and contribute to cost recovery …

Go to article

Prediction Of Haul Units’ Requirements For The Open Pit Mines Operating Towards Closure, Bartłomiej Skawina Dec 2019

Prediction Of Haul Units’ Requirements For The Open Pit Mines Operating Towards Closure, Bartłomiej Skawina

Tanzania Journal of Engineering and Technology (TJET)

The determination of haul units is one of the important steps in the equipment selection process. The process should aim at minimizing the operational costs and create an optimal match for the haulage system. When open pit mines operating towards closure, reducing the operational costs results in significant gaining, and the savings can be used to implement some of the closure plans. In this paper, the prediction of haul units for an open pit mine which operates towards the final pit limit was analysed using discrete event simulation and multiple linear regressions. The result shows that the changes in production …

Go to article

Practical Approach For Removal Of Natural Organic Matter And Defluoridation Of Maji Ya Chai River Water: Use Of Acid Pre-Treated Bone Char And Coagulants, Godfrey Mbabaye Dec 2019

Practical Approach For Removal Of Natural Organic Matter And Defluoridation Of Maji Ya Chai River Water: Use Of Acid Pre-Treated Bone Char And Coagulants, Godfrey Mbabaye

Tanzania Journal of Engineering and Technology (TJET)

The removal of natural organic matter (NOM) and fluoride from Maji ya Chai River water (MCRW) using bone char (BC) and coagulants was investigated. Fine BC particles ranging from 0.045 to 0.2 mm were used in a 1 litre half-filled container, stirred at 300 rpm for 60 min followed by addition of a commercial coagulant and allowed to settle for 24 hours to remove NOM. MCRW practicable and affordable defluoridation method for removal of NOM through defluoridation with BC pre-treated with 0.3 N HCl followed by coagulation with Poly-aluminium chloride (PACl) is proposed. Reduction of fluoride from 21 mg/L to …

Go to article

Reviewing The Potential And Constraints Of Modified Technology Options For Faecal Sludge Management In Dar Es Salaam, Tanzania, Amour Seleman Dec 2019

Reviewing The Potential And Constraints Of Modified Technology Options For Faecal Sludge Management In Dar Es Salaam, Tanzania, Amour Seleman

Tanzania Journal of Engineering and Technology (TJET)

Cities in the developing world face the challenge of safe management of faecal sludge because of rapid population growth that overwhelms the sanitation infrastructure and services. In developing countries, only 50% of faecal sludge (FS) generated is safely managed the remaining portion is haphazardly disposed of in the environment risking public health and environment. In response to the urgent need for safely managed sanitation services, technological options for containment, desludging and transportation of FS are being modified. This paper reviewed current desludging practices and the potential of modified technological options for addressing FSM at containment, desludging, and transportation in Dar …

Go to article

Altitudinal Distribution And Monthly Occurrence Of Butterflies In The Kihansi Gorge Forest, Tanzania, With A Checklist Of Species, Devolent Mtui, Colin Congdon, Ivan Bampton, Parson Kalenga, Haule Leonard Dec 2019

Altitudinal Distribution And Monthly Occurrence Of Butterflies In The Kihansi Gorge Forest, Tanzania, With A Checklist Of Species, Devolent Mtui, Colin Congdon, Ivan Bampton, Parson Kalenga, Haule Leonard

Tanzania Journal of Science

The goal of this project was to establish a checklist of butterflies occurring in Kihansi gorge to serve as baseline for monitoring of gorge ecosystem health. The key questions were what and how many species of butterflies occur in the gorge with respect to time and space. The study was conducted between October 2005 and February 2007. Butterflies were recorded twice a week, along a walking trail, using malaise traps and sweep net. The traps were located at upper (> 750 – 1100 m), mid (> 580 – 750 m) and lower (300 – 580 m) gorge. A total of …

Go to article

Reintroduction Of The Kihansi Spray Toad Nectophrynoides Asperginis Back To Its Natural Habitat By Using Acclimatizing Cages, Charles A. Msuya, Nassoro Mohamed Dec 2019

Reintroduction Of The Kihansi Spray Toad Nectophrynoides Asperginis Back To Its Natural Habitat By Using Acclimatizing Cages, Charles A. Msuya, Nassoro Mohamed

Tanzania Journal of Science

The Kihansi Spray Toad (Nectophrynoides asperginis) is considered to be extinct in the wild. Captive breeding populations exist in Bronx and Toledo zoos in USA and in two captive breeding facilities in Tanzania. Efforts to reintroduce the species back to its natural habitat at Kihansi Gorge wetlands have become a long process. Both ex-situ and in-situ experiments have revealed promising outcomes but when the toads are freely (hard) released in the wetlands they disperse widely and detection becomes difficult.  Cages for acclimatising the toads before hard release have been constructed in two of the Kihansi Gorge spray wetlands. Factors such …

Go to article

Mammals Inventory Of The Kihansi River Gorge In Udzungwa Mountains, Tanzania, Dennis K. Ikanda, Samuel N. Mtoka, Mustafa Hassanali, Anna Mshanga Dec 2019

Mammals Inventory Of The Kihansi River Gorge In Udzungwa Mountains, Tanzania, Dennis K. Ikanda, Samuel N. Mtoka, Mustafa Hassanali, Anna Mshanga

Tanzania Journal of Science

The Kihansi gorge montane forest in Udzungwa Mountains forms part of the Eastern Arc Mountains (EAM) which contain some of the most biologically diverse and endemic montane ecosystems in all of Africa. The Kihansi river gorge was opened up for hydroelectric development in the late 1990s, attracting hundreds of farming communities whose activities lead to environmental degradation and hence presumed biodiversity loss in the montane forest which is not understood. Using camera traps, an inventory of mammals of the area was conducted for 24 consecutive days. About 14 mammal species were photo captured, indicating diverse assemblage of large and medium …

Go to article

Morphological Diversity Of Wild Coffee (Coffea Kihansiensis) A Potential Coffee Species For Genetic Improvement, Paul M Kusolwa, Faraja Makwinja, Jackson Nashon, Mayomba Marianna, Amina Kibola Dec 2019

Morphological Diversity Of Wild Coffee (Coffea Kihansiensis) A Potential Coffee Species For Genetic Improvement, Paul M Kusolwa, Faraja Makwinja, Jackson Nashon, Mayomba Marianna, Amina Kibola

Tanzania Journal of Science

Coffee belongs to the genus Coffea in the Rubiaceae family, and is mostly grown in the tropical and subtropical regions. The Coffea genus comprises 103 species, of which Coffea arabica L. (Arabica coffee) and Coffea canephora P. (Robusta coffee) are the two most important commercial species. C. Arabica is a commercially important high quality coffee with low genetic diversity, while C. canephora is cultivated mostly in the northwestern region of Tanzania. Of recent, a discovered wild coffee (Coffea kihansiensis) in Tanzania may be a genetic resource for improvement of cultivated coffee.  Morphological descriptors from accessions evaluated in different sites at …

Go to article

Crop Pests, Control Measures And Potential Impacts In Kihansi Catchment Area, Beatrice Pallangyo, K. Mdily, C. Mkondo, A. Kibola Dec 2019

Crop Pests, Control Measures And Potential Impacts In Kihansi Catchment Area, Beatrice Pallangyo, K. Mdily, C. Mkondo, A. Kibola

Tanzania Journal of Science

A baseline survey which covered 349 households in Bomang’ombe and Masisiwe (Kilolo district), Kibengu and Mapanda (Mufindi district) and Chita and Chisano (Kilombero district) was conducted to identify major pests, control measures and potential impacts in Kihansi catchment area. Maize was the most predominant crop being cultivated by 55% of the total respondents in all the study districts. Pests and diseases were the major constraints to crop production, whereby cereal stem borers were the most serious pests being reported by 88.2% of respondents. Application of synthetic pesticides was the major pest control measure, being applied by 66% of the respondents. …

Go to article

Understorey Bird Communities 8 And 18 Years After River Diversion In Kihansi Gorge, Udzungwa Mountains In The Eastern Arc Mountains, Tanzania, Chacha Werema, Charles A. Msuya Dec 2019

Understorey Bird Communities 8 And 18 Years After River Diversion In Kihansi Gorge, Udzungwa Mountains In The Eastern Arc Mountains, Tanzania, Chacha Werema, Charles A. Msuya

Tanzania Journal of Science

On the most south-western slopes of the Udzungwa Mountains in Tanzania lies Kihansi River. The river was diverted underground in 2000 to run electric turbines for electricity generation. Using mist netting, pre-diversion (in 1998 and 1999) and short term post-diversion (in 2001) effects of the river diversion on understorey birds were undertaken before and year after river diversion, respectively. Intermediate and long-term effects of river diversion on understorey birds at the same transects are non-existent. In September 2008 and August and September 2018, using mist nets, birds were surveyed at the same transects  to assess whether or not there have …

Go to article

Land Use–Land Cover Change And Implication To Biodiversity In Kihansi Catchment, Phillip K. Mwanukuzi Dec 2019

Land Use–Land Cover Change And Implication To Biodiversity In Kihansi Catchment, Phillip K. Mwanukuzi

Tanzania Journal of Science

Land cover-land use (LC-LU) change has significant impact on wetland ecosystem. This study examined the impacts of LC-LU change on spray wetland ecology at Kihansi Gorge and implications to conservation of fragile biodiversity. Remote sensing methods were used to asses land cover changes from 1990 to 2015 and to forecast change in 2035. It was revealed that forests decreased from 28,454 to 10,897 ha and woodland from 26,903 to 19,914 ha. In 1990, woody cover dominated with a total cover of 38% of the entire catchment. The cropland that included grassland and bushland with scattered crops has been on the …

Go to article

Management And Population Status Of Kihansi Spray Toad Nectophrynoides Asperginis In Captive Breeding Facilities In Tanzania, Cuthbert L. Nahonyo, Ezekiel M. Goboro, Richard S. Ugomba, Emmanuel S. Nkombe, Severinus Mutagwaba, Hussein Adam, Juma I. Kimera, Person Kalenga, Wilirk Ngalason Dec 2019

Management And Population Status Of Kihansi Spray Toad Nectophrynoides Asperginis In Captive Breeding Facilities In Tanzania, Cuthbert L. Nahonyo, Ezekiel M. Goboro, Richard S. Ugomba, Emmanuel S. Nkombe, Severinus Mutagwaba, Hussein Adam, Juma I. Kimera, Person Kalenga, Wilirk Ngalason

Tanzania Journal of Science

Kihansi spray toad Nectophrynoides asperginis was discovered in 1996 in Kihansi gorge. The toad was declared extinct in the wild in 2009 due to habitat alteration. Before its extinction, 499 individuals were flown to the United States of America zoos in 2000 for captive breeding. In 2010, the University of Dar es Salaam, and in 2011 the Kihansi captive breeding facilities were established in Tanzania. The intention was to breed, and reintroduce the toad back to the natural environment in the gorge. The founder populations for the two facilities were sourced from the USA zoos. This study addresses captive management …

Go to article

The Dynamics Of Re-Introduced Kihansi Spray Toad Nectophrynoides Asperginis And Other Amphibians In Kihansi Gorge, Udzungwa Mountains, Tanzania, Wilirk Ngalason, Cuthbert L. Nahonyo, Charles A. Msuya Dec 2019

The Dynamics Of Re-Introduced Kihansi Spray Toad Nectophrynoides Asperginis And Other Amphibians In Kihansi Gorge, Udzungwa Mountains, Tanzania, Wilirk Ngalason, Cuthbert L. Nahonyo, Charles A. Msuya

Tanzania Journal of Science

The dynamics of the reintroduced Kihansi spray toad Nectophrynoides asperginis and other amphibian species that occur in the Kihansi gorge, Udzungwa Mountains were studied. The area is a home for the endemic toad that became extinct before individuals bred in captivity were reintroduced. Previous studies on the biology of amphibians conducted in the gorge focused on a few aspects but none has dealt with the dynamics of both the reintroduced Kihansi spray toad (KST) and other amphibians. Information on species richness and the abundance of amphibian species occurring in the gorge have not been dealt with in depth. Time-constrained audio-visual …

Go to article

Some Histopathological Findings In Dead Kihansi Spray Toads In Captivity, Joshua J Malago Dec 2019

Some Histopathological Findings In Dead Kihansi Spray Toads In Captivity, Joshua J Malago

Tanzania Journal of Science

Raising of Kihansi spray toad (KST), Nectophrynoides asperginis, in captivity is associated with disorders that can be fatal. Since diagnosis of these disorders cannot be confirmed grossly, the current study was aimed at exploring histopathological findings in dead KSTs kept under captivity in Tanzania. Dead KSTs were immediately recovered, observed for gross changes, fixed in 10% neutral buffered formalin, processed routinely, and stained sections reviewed for histological changes. Observed infectious agents were strongyloides (25.3%), ciliates (1.7%), lungworms (0.6%), fungi (3.4%) and bacteria (5.1%) or mixed infections (9%) of these agents. Noted histopathological lesions in affected organs included infiltration of inflammatory …

Go to article

Abundance And Distribution Of Afrosteles Distans An Indicator Of Food Availability For The Kihansi Spray Toad (Nectophrynoides Asperginis) In The Kihansi Gorge, Lulu T Kaaya, Rashid A Tamatamah, Timoth B Suya Dec 2019

Abundance And Distribution Of Afrosteles Distans An Indicator Of Food Availability For The Kihansi Spray Toad (Nectophrynoides Asperginis) In The Kihansi Gorge, Lulu T Kaaya, Rashid A Tamatamah, Timoth B Suya

Tanzania Journal of Science

Survivorship of the Kihansi Spray Toad in the wild depends on various factors such as environment, habitat, food availability, diseases and predation. This study assessed the abundance of Afrosteles distans Linnavuori 1959 as an indicator of food availability for the Kihansi Spray Toad. Samples were collected from sprinkled (A, B, C, D, E and F) and non-sprinkled (G and H) plots in the upper spray wetland in the Kihansi gorge during the dry period in 2007, 2008, 2015, 2016 and 2018. There was a significantly higher abundance of A. distans in sprinkled than non-sprinkled plots. ANOVA showed significant differences in …

Go to article

Research Work And Conservation Initiatives In The Kihansi Catchment Ecosystem, Tanzania, Cl Nahonyo Dec 2019

Research Work And Conservation Initiatives In The Kihansi Catchment Ecosystem, Tanzania, Cl Nahonyo

Tanzania Journal of Science

Keynote Address  for the Scientific Conference on Research and Conservation Initiatives in the Kihansi Catchment Ecosystem: Successes, Challenges and Way forward held at the National Carbon Monitoring Centre (NCMC), Sokoine University of Agriculture (SUA) on 24 – 27 July 2017.

Go to article

Histopathological Diagnosis Of Diseases Affecting Amphibians Inhabiting Kihansi Gorge, Tanzania, Joshua J Malago Dec 2019

Histopathological Diagnosis Of Diseases Affecting Amphibians Inhabiting Kihansi Gorge, Tanzania, Joshua J Malago

Tanzania Journal of Science

Kihansi gorge is a natural habitat to Kihansi spray toad (KST), Nectophrynoides asperginis. The toad is extinct in its natural habitat partly due to diseases. Efforts to successfully re-introduce it are primed by awareness and mitigation of prevalent diseases at the gorge. This study aimed at exploring the prevalent amphibian diseases at and around Kihansi gorge. A total of 182 individuals from Petropedetes yakusini (n = 60), Nectophrynoides tornieri (n = 60) and Leptopelis uluguruensis (n = 62) species were collected, humanely sacrificed, fixed in formalin, routinely processed, sectioned, stained with haematoxylin and eosin and analysed for diseases by histopathology. …

Go to article

Blind Algorithm Development For Peak To Average Power Ratio Reduction In Ofdm Systems Under Frequency Selective Channels, Kwame S. Ibwe Dec 2019

Blind Algorithm Development For Peak To Average Power Ratio Reduction In Ofdm Systems Under Frequency Selective Channels, Kwame S. Ibwe

Tanzania Journal of Engineering and Technology (TJET)

One major drawback of orthogonal frequency division multiplexing (OFDM) system is peak to average power ratio (PAPR). This effect causes high power amplifier (HPA) to introduce intermodulation and out of band radiation as the signal goes through, thus degrades the performance of OFDM systems. This paper proposes blind algorithms which takes advantage of signal transformation technique and signal distortion technique. Simulation results show that at complementary cumulative distribution function (CCDF) level of 10-3, the proposed algorithm achieved 3.2 dB PAPR improvement compared to discrete Fourier transform with interleaved frequency division multiple access (DFT-IFDMA) based algorithm. The bit error rate (BER) …

Go to article

Does The Seedling Emergence Technique Limit The Detection Of Seeds Of Miombo Species In Miombo Woodlands?, Halima M. Amir, Mkabwa L. K Manoko Dec 2019

Does The Seedling Emergence Technique Limit The Detection Of Seeds Of Miombo Species In Miombo Woodlands?, Halima M. Amir, Mkabwa L. K Manoko

Journal of Humanities and Social Sciences

Seedling emergence technique frequently used in soil seed bank studies indicates that seeds of Miombo species are not present in the soil seed bank. Does this method limit the detection of seeds of Miombo species in the soil seed bank? This question has not been investigated systematically. The present study aims to find out whether the seedling emergency method limits the detection of seeds of Miombo species in the soil seed bank of Miombo woodlands. In the investigation, seedling emergence and extraction methods were used to estimate soil seed bank in Miombo woodlands. Data were obtained from 50 circular plots …

Go to article

Women’S Autonomy In Decision-Making On Own Healthcare In Tanzania, Cresencia A. Masawe,, Eveline , G. Mcharo, Gasper B. Masawe Dec 2019

Women’S Autonomy In Decision-Making On Own Healthcare In Tanzania, Cresencia A. Masawe,, Eveline , G. Mcharo, Gasper B. Masawe

Journal of Humanities and Social Sciences

The status of women’s health has a direct influence on their decision-making regarding their healthcare. This study analyses the determinants of women’s autonomy in decision making regarding their own healthcare in Tanzania. The study uses data from the Tanzania Demographic and Health Survey, and the Malaria Indicator Survey (TDHS-MIS) conducted in 2015/2016. The focus of the analysis is on married women within an age range of 15 49 years. Cross-tabulation and logistic regression model were used to examine the association between women’s demographic characteristics—such as age, education level, place of residence, marital status, wealth index, and literacy level—and their autonomy …

Go to article

Chemical Composition And Behavioural Responses Of Male And Female Bactrocera Dorsalis To Their Volatile Emissions, Fikira Kimbokota Dec 2019

Chemical Composition And Behavioural Responses Of Male And Female Bactrocera Dorsalis To Their Volatile Emissions, Fikira Kimbokota

Journal of Humanities and Social Sciences

Bactrocera dorsalis, (Tephritidae) presented a grave threat to a broad range of fruit and vegetables in the tropics, including Tanzania. Bactrocera dorsalis is among the most destructive tephritid fruit fly, causing devastating loss of fruits especially mango. Insects use olfactory cues to locate hosts, oviposition sites and mating, in which pheromones are believed to be a strong cue used by insect to locate their mates. However, due to their high ability to adapt and occupy different ecological niches into various agroecological zones, there is a need to evaluate pheromonal composition from time to time to improve their control strategies. Therefore, …

Go to article

First Prev Next Last