We present a rare case associating inferior vena cava’s (IVC) complex variations. Anatomical, embryological and clinical aspects are discussed. Duplication’s discovery was fortuitous during an abdominal ultrasound a...We present a rare case associating inferior vena cava’s (IVC) complex variations. Anatomical, embryological and clinical aspects are discussed. Duplication’s discovery was fortuitous during an abdominal ultrasound and was confirmed by the CT scan. The latter also highlighted azygos continuation, retro aortic renal vein and an iliac venous anomaly. These variants are important to know in order to be able to differentiate them from lymphadenopathy, para-vertebral masses, and aortic pathologies. It is necessary to report them before any retroperitoneal surgery or interventional vascular procedure.展开更多
Stroke represents the 2<sup>nd</sup> cause of mortality and 1<sup>st</sup> cause of physical disability in the adult population. In Senegal, it represents 30% of hospitalization and 2/3 of the ...Stroke represents the 2<sup>nd</sup> cause of mortality and 1<sup>st</sup> cause of physical disability in the adult population. In Senegal, it represents 30% of hospitalization and 2/3 of the mortality in the department of neurology in the capital city, Dakar. <b>Objective: </b>To specify the types of stroke and to evaluate diagnostic delays in Senegal’s regional hospitals. <b>Materials and Methods: </b>This was a retrospective, cross-sectional, descriptive, multicentric study for 4 years (from 2014 to 2017) including any patient presenting a clinical suspicion with a CT scan confirmation of stroke in one of the 9 regional hospitals in Senegal with a recruitment period of 6 months per hospital. CT scans were performed with a 16 slices machine in 6 hospitals, 4 slices in 2 hospitals and 2 slices in 1 hospital. We studied the types and location of strokes, the associated signs and the time from stroke onset to admission and the time from admission to CT scan.<b> Results: </b>655 patients were retained including 322 men and 333 women for an M/F ratio of 0.96. The average age was 63 years (range: 7 years, 112 years). High blood pressure was noted in 59.2% of patients and diabetes in 10.7% of patients. Strokes were ischemic in 76% of cases involving the middle cerebral artery in 73% of cases and hemorrhagic in 24%, of which 80.7% were deep localized. A mass effect was noted in 7.5% of cases, an engagement in 6.9% of cases and ventricular hemorrhage in 2.7% of cases. The delay between the onset of the deficit and admission was less than 6 hours in 10.6% of patients. The time between the onset of stroke and admission to hospital was specified in 416 patients (63.5%) of the study population, it was less than 6 hours in 10.6% of patients, between 6 hours and 24 hours for 29.3% and more than 24 hours for 60.1%. Between admission and the CT scan, the time was precise in 459 patients (70%), it was less than 6 hours in 37.9%, between 6 hours and 24 hours in 43.6 % and more than 24 hours in 18.5%. <b>Conclusion: </b>CT is central to the diagnosis of stroke in rural areas. However, there is a significant delay in diagnosis and management.展开更多
The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental char...The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental characteristics of the Tertiary carbonates in the key sector of Central Luconia.We study the sedimentology and petrography of core samples from a well in Central Luconia, for which thirteen microfacies have been identified reflecting different depositional settings. This is the first microfacies scheme elaborated for Luconian carbonates. Lithofacies and microfacies distribution are compatible with deposition in a reef complex, originating around a framework reef, within the euphotic zone. Sediments were deposited in environments of backreef, reef crest, and forereef. The fair weather wave base is marked by the presence of coralline red algae, foraminifera, decreasing degree of bioclast fragmentation and other microfacies features. As a result, a depositional-environmental model is constructed, depicting a reef complex built around a framework reef developed on the margin of an isolated platform. In addition, an innovative, preliminary time series analysis of facies, microfacies and depositional environment data reveal the existence of seasonal cycles in the stacking patterns of facies and microfacies.展开更多
In shape optimization,we often seek to optimize the shape of a domain in order to achieve a goal.For example,the sound of a drum depends on the shape of its membrane,via the eigenvalues of the Laplacian.We use the sha...In shape optimization,we often seek to optimize the shape of a domain in order to achieve a goal.For example,the sound of a drum depends on the shape of its membrane,via the eigenvalues of the Laplacian.We use the shape derivative to adjust this shape.The shape derivative for an eigenvalue problem is frequently used in shape optimisation,in particular when we want to min-imise or maximise an eigenvalue,often the first of an elliptic operator,typi-cally the Laplacian,under geometric constraints.This paper gives a simple method for calculating the shape derivative of a Dirichlet eigenvalue,but also the shape derivative of an objective function constrained to an eigenvalue problem.展开更多
文摘We present a rare case associating inferior vena cava’s (IVC) complex variations. Anatomical, embryological and clinical aspects are discussed. Duplication’s discovery was fortuitous during an abdominal ultrasound and was confirmed by the CT scan. The latter also highlighted azygos continuation, retro aortic renal vein and an iliac venous anomaly. These variants are important to know in order to be able to differentiate them from lymphadenopathy, para-vertebral masses, and aortic pathologies. It is necessary to report them before any retroperitoneal surgery or interventional vascular procedure.
文摘Stroke represents the 2<sup>nd</sup> cause of mortality and 1<sup>st</sup> cause of physical disability in the adult population. In Senegal, it represents 30% of hospitalization and 2/3 of the mortality in the department of neurology in the capital city, Dakar. <b>Objective: </b>To specify the types of stroke and to evaluate diagnostic delays in Senegal’s regional hospitals. <b>Materials and Methods: </b>This was a retrospective, cross-sectional, descriptive, multicentric study for 4 years (from 2014 to 2017) including any patient presenting a clinical suspicion with a CT scan confirmation of stroke in one of the 9 regional hospitals in Senegal with a recruitment period of 6 months per hospital. CT scans were performed with a 16 slices machine in 6 hospitals, 4 slices in 2 hospitals and 2 slices in 1 hospital. We studied the types and location of strokes, the associated signs and the time from stroke onset to admission and the time from admission to CT scan.<b> Results: </b>655 patients were retained including 322 men and 333 women for an M/F ratio of 0.96. The average age was 63 years (range: 7 years, 112 years). High blood pressure was noted in 59.2% of patients and diabetes in 10.7% of patients. Strokes were ischemic in 76% of cases involving the middle cerebral artery in 73% of cases and hemorrhagic in 24%, of which 80.7% were deep localized. A mass effect was noted in 7.5% of cases, an engagement in 6.9% of cases and ventricular hemorrhage in 2.7% of cases. The delay between the onset of the deficit and admission was less than 6 hours in 10.6% of patients. The time between the onset of stroke and admission to hospital was specified in 416 patients (63.5%) of the study population, it was less than 6 hours in 10.6% of patients, between 6 hours and 24 hours for 29.3% and more than 24 hours for 60.1%. Between admission and the CT scan, the time was precise in 459 patients (70%), it was less than 6 hours in 37.9%, between 6 hours and 24 hours in 43.6 % and more than 24 hours in 18.5%. <b>Conclusion: </b>CT is central to the diagnosis of stroke in rural areas. However, there is a significant delay in diagnosis and management.
基金financial assistance throughout the research under the grant YUTP 0153AAA14financial support from UTP through the grant URIF 2014-00735
文摘The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental characteristics of the Tertiary carbonates in the key sector of Central Luconia.We study the sedimentology and petrography of core samples from a well in Central Luconia, for which thirteen microfacies have been identified reflecting different depositional settings. This is the first microfacies scheme elaborated for Luconian carbonates. Lithofacies and microfacies distribution are compatible with deposition in a reef complex, originating around a framework reef, within the euphotic zone. Sediments were deposited in environments of backreef, reef crest, and forereef. The fair weather wave base is marked by the presence of coralline red algae, foraminifera, decreasing degree of bioclast fragmentation and other microfacies features. As a result, a depositional-environmental model is constructed, depicting a reef complex built around a framework reef developed on the margin of an isolated platform. In addition, an innovative, preliminary time series analysis of facies, microfacies and depositional environment data reveal the existence of seasonal cycles in the stacking patterns of facies and microfacies.
文摘In shape optimization,we often seek to optimize the shape of a domain in order to achieve a goal.For example,the sound of a drum depends on the shape of its membrane,via the eigenvalues of the Laplacian.We use the shape derivative to adjust this shape.The shape derivative for an eigenvalue problem is frequently used in shape optimisation,in particular when we want to min-imise or maximise an eigenvalue,often the first of an elliptic operator,typi-cally the Laplacian,under geometric constraints.This paper gives a simple method for calculating the shape derivative of a Dirichlet eigenvalue,but also the shape derivative of an objective function constrained to an eigenvalue problem.
