Objectives: The aim of this study was to analyse key factors and main indications of primary caesarean sections and find out ways to reduce the rising rates. Patients and method: This was a longitudinal and retrospect...Objectives: The aim of this study was to analyse key factors and main indications of primary caesarean sections and find out ways to reduce the rising rates. Patients and method: This was a longitudinal and retrospective study carried out from 1 January 2012 to 31 December 2016. The study included all patients in whom a primary CS was performed. A previous uterine scar was a non-inclusion criterion. We analysed the main indications and their trends during these five years, Apgar score at the 5th minute according to the course of caesarean section rate and the impact of daily audit. Data were collected retrospectively from 2012 to 2015, then prospectively in 2016 using a Filemaker database. Data were analysed with SPSS 21 software, Mac version. Averages were calculated for quantitative data and percentage for qualitative ones. The statistical tests used were the Pearson Chi2 test. The differences observed were considered significant when the p value was less than 0.05. Results: During the study period, we registered 21.308 deliveries and 6.292 caesarean sections (29.5%). Primary CS concerned 72.5% of overall CS. The main indications were suspicious of fetal distress (29.1%), obstructed or prolonged labour (21.7%), breech and twin delivery with respectively 8.2% and 5.2%. We registered more vaginal deliveries with induction of labour: 81.4% versus 75.2%. An obstetrical audit allowed better management of labour and decrease of CS rate. Conclusion: We need to focus on diagnosis of fetal distress, management of breech presentation in twin delivery and singleton. The induction of labour can be an effective alternative in some indications. An obstetrical audit is necessary to reverse caesarean section rate.展开更多
In this paper, the modeling ofa bifacial polycrystalline silicon solar cells vertical junction is presented. The study in dynamic frequency is limited to wavelengths from 400 nm to 1100 nm. The dependence of solar cel...In this paper, the modeling ofa bifacial polycrystalline silicon solar cells vertical junction is presented. The study in dynamic frequency is limited to wavelengths from 400 nm to 1100 nm. The dependence of solar cell spectral response on wavelengths for several modulation frequencies was evaluated by using solar cell internal quantum efficiency.The objective is to characterize the polycrystalline silicon in 3D. The effect of frequency modulation pulsation on the phase of internal quantum efficiency was presented as well as values of shunt and series resistance for various grains size values. The results show that the value of maximum internal quantum efficiency is about 50% with a wavelength of 0,82 nm and a frequency of 103 rad/s under monochromatic illumination.展开更多
文摘Objectives: The aim of this study was to analyse key factors and main indications of primary caesarean sections and find out ways to reduce the rising rates. Patients and method: This was a longitudinal and retrospective study carried out from 1 January 2012 to 31 December 2016. The study included all patients in whom a primary CS was performed. A previous uterine scar was a non-inclusion criterion. We analysed the main indications and their trends during these five years, Apgar score at the 5th minute according to the course of caesarean section rate and the impact of daily audit. Data were collected retrospectively from 2012 to 2015, then prospectively in 2016 using a Filemaker database. Data were analysed with SPSS 21 software, Mac version. Averages were calculated for quantitative data and percentage for qualitative ones. The statistical tests used were the Pearson Chi2 test. The differences observed were considered significant when the p value was less than 0.05. Results: During the study period, we registered 21.308 deliveries and 6.292 caesarean sections (29.5%). Primary CS concerned 72.5% of overall CS. The main indications were suspicious of fetal distress (29.1%), obstructed or prolonged labour (21.7%), breech and twin delivery with respectively 8.2% and 5.2%. We registered more vaginal deliveries with induction of labour: 81.4% versus 75.2%. An obstetrical audit allowed better management of labour and decrease of CS rate. Conclusion: We need to focus on diagnosis of fetal distress, management of breech presentation in twin delivery and singleton. The induction of labour can be an effective alternative in some indications. An obstetrical audit is necessary to reverse caesarean section rate.
文摘In this paper, the modeling ofa bifacial polycrystalline silicon solar cells vertical junction is presented. The study in dynamic frequency is limited to wavelengths from 400 nm to 1100 nm. The dependence of solar cell spectral response on wavelengths for several modulation frequencies was evaluated by using solar cell internal quantum efficiency.The objective is to characterize the polycrystalline silicon in 3D. The effect of frequency modulation pulsation on the phase of internal quantum efficiency was presented as well as values of shunt and series resistance for various grains size values. The results show that the value of maximum internal quantum efficiency is about 50% with a wavelength of 0,82 nm and a frequency of 103 rad/s under monochromatic illumination.
