47 research outputs found
Changing depocentre environments of Palaeolake Olduvai and carbonates as marker horizons for hiatuses and lake-level extremes
Influence of Alternative Financing on the Relationship between Managerial Competency and Efficiency of Small and Medium Enterprises in Kenya
Worldwide, Small and medium-size enterprises (SMEs) exhibit inimitable financial needs. While SMEs remain fundamental to economic growth, their mortality rate in Kenya approaches 90% by the second year, mainly owing to lack of credit. However, scholarly endeavors exploring the impact of alternative finance (AF) on managerial competency - efficiency nexus for manufacturing SMEs have received little attention in Kenya. To resolve this conundrum, a thorough study to investigate how AF impacts managerial competency - efficiency nexus is necessary. The study used a cross-sectional research design, employing both qualitative and quantitative research approaches. The target population was 171 SMEs registered with Kenya Association of Manufacturers. The accessible population was 136 SMEs owners/managers. A semi-structured questionnaire was used to collect primary and secondary data. Data envelopment analysis was used to measure efficiency, multiple regression modeling used to analyze the direct relationships while hierarchical moderated multiple regression analysis employed to test moderation. Partial Least Squares Structural Equation Modeling was used to test robustness of our results. The findings of this study demonstrate that managerial competency positively influences efficiency (? = 0.150, t-value =10.246, P<0.05), and that alternative finance does moderate managerial competency relationships with efficiency (R-Square change of 21.7%). We suggest trainings for manufacturing SME owners/managers in Kenya on the pivotal role of alternative finance to facilitate SMEs achieve higher efficiencies and accelerate economic growth
Influence of Alternative Financing on the Relationship between Firm Size and Efficiency of Small and Medium Enterprises in Kenya
Globally, small and medium-size enterprises(SMEs) hold great economic growth potential, however their mortality rate is high, due to lack of credit. The SMEs mortality rate in Kenya is 90% by the second year. Scholarly endeavors to explore the influence of alternative finance (AF) on operational characteristics - efficiency nexus have received little attention, more so for SMEs who have unique financial needs. Although AF appears to be the preferred mode of financing and maintaining start-ups, its impact on the survival, growth and success of manufacturing SMEs is not well documented in Kenya. This study focused on establishing the influence of alternative financing on the relationship between firm-size and efficiency of SMEs in Kenya. The study used a cross-sectional research design. The target population was SMEs registered with Kenya Association of Manufacturers (KAM). The accessible population was 136 SMEs owner/managers. The study used a self-administered semi structured questionnaire to collect primary and secondary data. Data envelopment analysis was used to measure efficiency of SMEs, multiple regression modeling to analyze relationships and hierarchical moderated multiple regression analysis was used to assess the influence of the moderator. The findings revealed that firm-size positively (? = 0.214, t-value =4.983, P<0.05.) influences efficiency and that alternative finance does moderate (R-Square change 11.1 %) firm size relationships with efficiency. The study recommends that owner/managers of manufacturing SMEs in Kenya should give attention to opportunities for sustainable increase in firm size to improve their efficiency
Paleoecology of the Serengeti during the Oldowan-Acheulean transition at Olduvai Gorge, Tanzania : The mammal and fish evidence
Eight years of excavation work by the Olduvai Geochronology and Archaeology Project (OGAP) has produced a rich vertebrate fauna from several sites within Bed II, Olduvai Gorge, Tanzania. Study of these as well as recently re-organized collections from Mary Leakey's 1972 HWK EE excavations here provides a synthetic view of the faunal community of Olduvai during Middle Bed II at similar to 1.7-1.4 Ma, an interval that captures the local transition from Oldowan to Acheulean technology. We expand the faunal list for this interval, name a new bovid species, clarify the evolution of several mammalian lineages, and record new local first and last appearances. Compositions of the fish and large mammal assemblages support previous indications for the dominance of open and seasonal grassland habitats at the margins of an alkaline lake. Fish diversity is low and dominated by cichlids, which indicates strongly saline conditions. The taphonomy of the fish assemblages supports reconstructions of fluctuating lake levels with mass die-offs in evaporating pools. The mammals are dominated by grazing bovids and equids. Habitats remained consistently dry and open throughout the entire Bed II sequence, with no major turnover or paleoecological changes taking place. Rather, wooded and wet habitats had already given way to drier and more open habitats by the top of Bed I, at 1.85-1.80 Ma. This ecological change is close to the age of the Oldowan-Acheulean transition in Kenya and Ethiopia, but precedes the local transition in Middle Bed II. The Middle Bed II large mammal community is much richer in species and includes a much larger number of large-bodied species (>300 kg) than the modern Serengeti. This reflects the severity of Pleistocene extinctions on African large mammals, with the loss of large species fitting a pattern typical of defaunation or 'downsizing' by human disturbance. However, trophic network (food web) analyses show that the Middle Bed II community was robust, and comparisons with the Serengeti community indicate that the fundamental structure of food webs remained intact despite Pleistocene extinctions. The presence of a generalized meateating hominin in the Middle Bed II community would have increased competition among carnivores and vulnerability among herbivores, but the high generality and interconnectedness of the Middle Bed II food web suggests this community was buffered against extinctions caused by trophic interactions. (C) 2017 Published by Elsevier Ltd.Peer reviewe
New excavations at the HWK EE site: Archaeology, paleoenvironment and site formation processes during late Oldowan times at Olduvai Gorge, Tanzania
This paper reports the results of renewed fieldwork at the HWK EEsite(Olduvai Gorge, Tanzania). HWK EEis positioned across the boundary between Lower andMiddle Bed II, a crucialinterval for studyingthe emergence of the Acheulean at Olduvai Gorge. Our excavations at HWK EEhave produced one of the largest collections of fossils and artefacts from any Oldowan site, distributed across several archaeological units and a large excavation surface in four separate trenches thatcan be stratigraphically correlated. Here we present the main stratigraphic and archaeological units and discuss site formation processes.Results show a great density of fossils and stone tools vertically through two stratigraphic intervals (Lemuta and Lower Augitic Sandstone)and laterally across an area of around 300 m2, and highlight the confluence of biotic and abiotic agents in the formation of the assemblage. The large size and diversityof the assemblage, as well as its good preservation, qualify HWK EEas a reference sitefor the study of the late Oldowan at Olduvai Gorge and elsewhere in Africa. In addition, thedescriptionof the stratigraphic and archaeological sequenceof HWK EE presented in this paper constitutesthe foundation for further studies on hominin behaviour and palaeoecologyin Lower and Middle Bed II
A Case-Control Study to Assess the Relationship between Poverty and Visual Impairment from Cataract in Kenya, the Philippines, and Bangladesh
Hannah Kuper and colleagues report a population-based case-control study conducted in three countries that found an association between poverty and visual impairment from cataract
Paleoecology of the Serengeti during the oldowan-Acheulean transition at Olduvai Gorge, Tanzania: The mammal and fish evidence
Eight years of excavation work by the Olduvai Geochronology and Archaeology Project (OGAP) has
produced a rich vertebrate fauna from several sites within Bed II, Olduvai Gorge, Tanzania. Study of these
as well as recently re-organized collections from Mary Leakey's 1972 HWK EE excavations here provides
a synthetic view of the faunal community of Olduvai during Middle Bed II at ~1.7e1.4 Ma, an interval that
captures the local transition from Oldowan to Acheulean technology. We expand the faunal list for this
interval, name a new bovid species, clarify the evolution of several mammalian lineages, and record new
local first and last appearances. Compositions of the fish and large mammal assemblages support previous indications for the dominance of open and seasonal grassland habitats at the margins of an alkaline
lake. Fish diversity is low and dominated by cichlids, which indicates strongly saline conditions. The
taphonomy of the fish assemblages supports reconstructions of fluctuating lake levels with mass die-offs
in evaporating pools. The mammals are dominated by grazing bovids and equids. Habitats remained
consistently dry and open throughout the entire Bed II sequence, with no major turnover or paleoecological changes taking place. Rather, wooded and wet habitats had already given way to drier and more
open habitats by the top of Bed I, at 1.85e1.80 Ma. This ecological change is close to the age of the
Oldowan-Acheulean transition in Kenya and Ethiopia, but precedes the local transition in Middle Bed II.
The Middle Bed II large mammal community is much richer in species and includes a much larger number
of large-bodied species (>300 kg) than the modern Serengeti. This reflects the severity of Pleistocene extinctions on African large mammals, with the loss of large species fitting a pattern typical of defaunation or
‘downsizing’ by human disturbance. However, trophic network (food web) analyses show that the Middle
Bed II community was robust, and comparisons with the Serengeti community indicate that the fundamental
structure of food webs remained intact despite Pleistocene extinctions. The presence of a generalized meateating hominin in the Middle Bed II community would have increased competition among carnivores and
vulnerability among herbivores, but the high generality and interconnectedness of the Middle Bed II food
web suggests this community was buffered against extinctions caused by trophic interactions.Fieldwork by OGAP is authorized by the National Museum of Tanzania, Tanzanian Antiquities, and COSTECH, and the Ngorongoro Conservation Authority, and was funded by the NSF (BCS-0852292)
and a European Research Council Starting Grant (283366). FB was supported by the German Research Foundation (DFG, grant number BI 1879/1-1). AS was funded by the LaScArBx (Universite de
Bordeaux), a research program supported by the Agence Nationale de la Recherche, France (ANR-10-LABX-52), and a SYNTHESYS grant (DE-TAF-5741). SV was supported by a post-doctoral fellowship
from the Alexander von Humboldt Foundation. LW was funded by the Swedish Research Council.Peer reviewe
A New Horned Crocodile from the Plio-Pleistocene Hominid Sites at Olduvai Gorge, Tanzania
BACKGROUND: The fossil record reveals surprising crocodile diversity in the Neogene of Africa, but relationships with their living relatives and the biogeographic origins of the modern African crocodylian fauna are poorly understood. A Plio-Pleistocene crocodile from Olduvai Gorge, Tanzania, represents a new extinct species and shows that high crocodylian diversity in Africa persisted after the Miocene. It had prominent triangular "horns" over the ears and a relatively deep snout, these resemble those of the recently extinct Malagasy crocodile Voay robustus, but the new species lacks features found among osteolaemines and shares derived similarities with living species of Crocodylus. METHODOLOGY/PRINCIPAL FINDINGS: The holotype consists of a partial skull and skeleton and was collected on the surface between two tuffs dated to approximately 1.84 million years (Ma), in the same interval near the type localities for the hominids Homo habilis and Australopithecus boisei. It was compared with previously-collected material from Olduvai Gorge referable to the same species. Phylogenetic analysis places the new form within or adjacent to crown Crocodylus. CONCLUSIONS/SIGNIFICANCE: The new crocodile species was the largest predator encountered by our ancestors at Olduvai Gorge, as indicated by hominid specimens preserving crocodile bite marks from these sites. The new species also reinforces the emerging view of high crocodylian diversity throughout the Neogene, and it represents one of the few extinct species referable to crown genus Crocodylus
Burnout among surgeons before and during the SARS-CoV-2 pandemic: an international survey
Background: SARS-CoV-2 pandemic has had many significant impacts within the surgical realm, and surgeons have been obligated to reconsider almost every aspect of daily clinical practice. Methods: This is a cross-sectional study reported in compliance with the CHERRIES guidelines and conducted through an online platform from June 14th to July 15th, 2020. The primary outcome was the burden of burnout during the pandemic indicated by the validated Shirom-Melamed Burnout Measure. Results: Nine hundred fifty-four surgeons completed the survey. The median length of practice was 10 years; 78.2% included were male with a median age of 37 years old, 39.5% were consultants, 68.9% were general surgeons, and 55.7% were affiliated with an academic institution. Overall, there was a significant increase in the mean burnout score during the pandemic; longer years of practice and older age were significantly associated with less burnout. There were significant reductions in the median number of outpatient visits, operated cases, on-call hours, emergency visits, and research work, so, 48.2% of respondents felt that the training resources were insufficient. The majority (81.3%) of respondents reported that their hospitals were included in the management of COVID-19, 66.5% felt their roles had been minimized; 41% were asked to assist in non-surgical medical practices, and 37.6% of respondents were included in COVID-19 management. Conclusions: There was a significant burnout among trainees. Almost all aspects of clinical and research activities were affected with a significant reduction in the volume of research, outpatient clinic visits, surgical procedures, on-call hours, and emergency cases hindering the training. Trial registration: The study was registered on clicaltrials.gov "NCT04433286" on 16/06/2020