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uplift of the Arabian Shield and the opening of the Red Sea led to the
development of steep drainage systems in the Western Arabian Peninsula.
Although the Peninsula has been studied from a geological perspective, in
relation to oil production, plate tectonics and eolian systems such as sand
dunes, the steep mountainous drainage basins have received much less attention.
This paper aims to assess the characteristics and development of 36 drainage
basins in the Western Arabian Peninsula, using a digital elevation model (DEM),
principal component analysis (PCA), and hierarchical cluster analysis (CA).
Three major principal components (PC1 to PC3) are found to explain 73% of total
variance. CA divided the basins into two or four groups. The division by CA
strongly reflects PC1, showing that the two analyses give comparable results.
PC1 strongly reflects basin dimensions and drainage texture, and their positive
correlations indicate the significant effect of basin relief and slope on mass
wasting and limited stream incision in small basins under an arid climate. PC2
mainly reflects the effect of bedrock geology, suggesting that volcanic rocks
tend to produce more elongated and less eroded immature basins than crystalline
rocks do. PC3 mainly reflects the basin relief and slope and the length of each
stream segment, which may also reflect the effect of mass wasting on stream
Background: There is a progressive
shift away from the use of forceps in favour of the vacuum extractor as the instrument
of choice for operative vaginal deliveries. The overall objective of this is to
improve safe motherhood by reducing the contribution of second stage of labour
complications to maternal mortality and morbidity. Objective: This study was
carried out to determine the incidence, indications, outcome and complications
of Ventouse delivery in Aminu Kano Teaching Hospital, Kano, Nigeria. Materials
and Methods: This was a retrospective study carried out at the Aminu Kano
Teaching Hospital. The case notes of all parturients who had vacuum deliveries
in the hospital within January 2008 to December 2012 were retrieved from the
statistics unit of the hospital and analysed using SPSS. Results: 22,680
patients delivered in the hospital over this 5-year period. Ventouse was used
on 210 occasions giving an incidence rate of 0.9%. One hundred and eighty
(85.7%) had successful vacuum delivery. The failed extractions (14.3%) were
delivered by caesarean sections. The mean age of the patients was 29.4 years.
The mean parity was 2.2. Ninety (42.9%) were primipara while 120 (57.1%) were
multipara. The commonest indication for the vacuum delivery was prolonged
second stage of labour in 45.2% of cases. The commonest maternal complication
was primary postpartum haemorrhage (9.5%). Foetal complication occurred in
about 31% of vacuum deliveries, the commonest (18.1%), being cephalhaematoma.
Conclusion: The incidence rate of vacuum delivery is low. Thus, active training
in the art of vacuum assisted vaginal delivery is clearly needed during
The purpose of this study is to examine the predictive effect of life
satisfaction and loneliness level of adolescents with divorced parents on resilience.
The study has been carried out on 144 adolescents, 75 of whom are female and 69
are male, and whose parents are officially divorced. The study group consisted
of students who are attending different types of high schools in the city of
Bolu central districts. Loneliness Scale, Life Satisfaction Scale and
Adolescents Resilience Scales were utilized in the data collection process.
Pearson Moment Correlation and Multiple Regression analyses were used in data
analysis. The results revealed that, while there was a positive relationship
between resilience and life satisfaction, a strong negative relationship was
found between their resilience and loneliness level of the adolescents whose
parents are divorced. Regression analysis revealed that, while loneliness was a
significant predictor on resilience, life satisfaction was not a significant
predictor of resilience. The findings of this research were discussed within
the scope of the related literature.
We investigate Gaver’s parallel system
attended by a cold standby unit and a repairman with multiple vacations. By
using C0-semigroup theory of linear operators in the functional analysis, we
prove well-posedness and the existence of the unique positive dynamic solution
of the system.