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Placenta Previa at Souro Sanou Teaching Hospital, Burk.na Faso (About 142 Cases)

Open Journal of Obstetrics and Gynecology 2022年第11期12卷 1113-1120页

作者： Yaméogo Rélwendé Barnabé Millogo Jean de la Croix Bassinga k.vin Wendpouyri Jonathan k.boré Ahmed Somé Der Adolphe Obstetrics-Gynecology and Reproductive Medecine Department of Sourô Sanou Teaching Hospital Bobo Dioulasso Burkina Faso Public Health Department of Joseph k.-Zerbo University Ouagadougou Burkina Faso

Introduction: Placenta previa is an obstetric emergency that can be life-threatening for both mother and foetus. Despite the progress made in diagnosis and treatment, it continues to be feared by obstetricians because of high maternal and perinatal mortality and increased morbidity. This study aims to investigate the diagnostic, therapeutic and prognostic aspects of placenta previa at the Sourô Sanou University Hospital in Bobo-Dioulasso. Method: This was a descriptive cross-sectional study with retrospective data collection from January 1, 2016 to December 31, 2018. Included were 142 pregnant women admitted to the maternity ward of the Sourô Sanou University Hospital (CHUSS) and diagnosed with placenta previa during pregnancy, labor, or in the postpartum period. Result: The frequency of placenta previa was 0.89%;the average age of patients was 28.51 years with extremes of 16 and 44 years. The multigestations represented 28.17% and the pauciparous 31.69%. Patients with a uterine scar represented 15.49%. Ultrasound diagnosis was made in 38 patients (26.76%). Placenta previa was recovered in 56.34% of cases. Patients with severe anaemia were 28.87%, and 57.04% of the anaemic cases received blood transfusion. Caesarean section was performed in 93.66% of patients. Four maternal deaths (2.81%) and 30 stillbirths (27.02%) were reported. Conclusion: Placenta previa remains a fairly frequent pathology with a non-negligible lethality rate and perinatal mortality in the maternity ward of the Sourô Sanou University Hospital.

关键词： Placenta Previa Prognosis Bobo-Dioulasso

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Renewable Energies in Africa, Context and Socio-Economic Challenge

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Open Journal of Applied Sciences 2022年第11期12卷 1856-1872页

作者： Daouda Oubda Soumaïla Ouédraogo Alain Diasso Marcel Bawindsom k.bré François Zougmoré Zacharie k.alga Frédéric Ouattara la.M.E (laboratoire de Matériaux et Environnement) UFR-SEA (Unité de Formation et de Recherche en Sciences Exactes et Appliquées) Ecole Doctorale Sciences et Technologies Université Joseph KI-ZERBO Ouagadougou Burkina Faso la.R.E.M.E (laboratoire de Recherche en Energétique et Météorologie de l’Espace) Université Norbert Zongo Koudougou Burkina Faso

In this paper, we have shown that Africa has an enormous wealth of renewable energy resources among the most important in the world such as the strong sunshine, Congo and Nile Rivers respectively among the most powerful and the longest in the world. We have underlined the presence of important forests, rich subsoil in mineral elements, and strong winds. In addition to a rapidly growing human capital, Africa, therefore, has at its disposal all the factors enabling it to initiate sustainable and inclusive socio-economic development. We have shown that the transformation of these renewable energies is an opportunity for Africa to reach its socio-economic challenges. The development of renewable energies in Africa will be a source of many financial benefits and advantages both in terms of improving living conditions and carrying out activities. The electrical supply of rural areas of Africa represents a considerable issue, which can be a propellant factor in long-term socio-economic development if the conditions of use of clean fuel and cook.ng technologies, especially sanitary are tak.n into account. The provision of modern energy services can contribute to the creation of jobs for young people upstream. Among other things, we can note the development of local sk.lls, the creation of income-generating activities, and the improvement of hygiene and health measures which are necessary conditions for family and social well-being. This requires a policy focused, on research in general and in particular on semiconductors that participate in the transformation of photovoltaic solar energy. We have stressed that Africa which is currently experiencing a period of economic growth and sustained transformation must be very look.ng at in its energy policy and give pride of place to renewable energies to initiate sustainable socio-economic development, equitable and inclusive different social strata both in rural areas and urban areas.

关键词： Africa Renewable Energy Photovoltaic Solar Energy Semiconductor Socio-Economic Urban Area Rural Area

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Correlation of DNA methylation patterns to the phenotypic features of Tibetan elite alpinists in extreme hypoxia

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Journal of Genetics and Genomics 2021年第10期48卷 928-935页

作者： Zhuoma Basang Shixuan Zhang la Yang Deji Quzong Yi Li Yanyun Ma Meng Hao WeiLin Pu Xiaoyu Liu Hongjun Xie Meng Liang Jiucun Wang Qiangba Danzeng High Altitude Medical Research Center of Tibet University/Center of Tibetan Studies(Everest Research Institute) Tibet University10 East Zangda RoadLhasaTibet 850000China State k.y laboratory of Genetic Engineering School of Life Sciences&Human Phenome InstituteFudan UniversityShanghai 200438China Institute for Six-sector Economy Fudan UniversityShanghai 200433China Ministry of Education k.y laboratory of Contemporary Anthropology Department of Anthropology and Human GeneticsSchool of Life SciencesFudan UniversityShanghai 200438China Tibet University-Fudan University Joint laboratory for Biodiversity and Global Change Tibet University10 East Zangda RoadLhasaTibet 850000China

High altitude is an extreme environment that imposes hypoxic pressure on physiological processes,and natives living at high altitudes are more adaptive in certain physiological *** far,epigenetic modifications under extreme changes in hypoxic pressures are relatively less ***,we recruit 32 Tibetan elite alpinists(TEAs),who have successfully mounted Everest(8848 m)at least five *** samples and physiological phenotypes of TEAs and 32 matched non-alpinist Tibetan volunteers(non-TEAs)are collected for ***-wide DNA methylation analysis identifies 23,202 differentially methylated CpGs(P_(adj)0.1)between the two *** differentially methylated CpGs are in hypoxia-related genes such as PPP1R13L,MAP3k.CL,SEPTI-9,and *** addition,Gene ontology enrichment analysis reveals several inflammation-related *** analysis indicates that 12 phenotypes are significantly different between the two *** particular,TEAs exhibit higher blood oxygen saturation levels and lower neutrophil count,platelet count,and heart *** DNA methylation association analysis,we find that two CpGs(cg16687447,cg06947206)upstream of PTEN were associated with platelet *** conclusion,extreme hypoxia exposure leads to epigenetic modifications and phenotypic alterations of TEA,providing us clues for exploring the molecular mechanism underlying changes under extreme hypoxia conditions.

关键词： Adaptive potentials Extreme hypoxia environment DNA methylation Phenotype association Elite alpinists Mountaineering

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High Performance for Cu(In,Ga)Se₂ Quaternary System-Based Solar Cells with Alternative Buffer layers

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Advances in Materials Physics and Chemistry 2022年第9期12卷 207-219页

作者： Daouda Oubda Marcel Bawindsom k.bré Soumaïla Ouédraogo Alain Diasso François Zougmoré Zacharie k.alga Frédéric Ouattara laboratoire de Matériaux et Environnement (la.M.E)-UFR/SEA Université Joseph KI-ZERBO Ouagadougou Burkina Faso laboratoire de Recherche en Energétique et Météorologie de l’Espace (la.R.E.M.E) Université Norbert Zongo Koudougou Burkina Faso

In this study, the authors investigated the performance of different buffer layers through the electrical parameters such as Jsc, Voc, QE and η of the quaternary system Cu(In,Ga)Se2 solar cells. The performance of Cu(In,Ga)Se2solar cells has been modeled and numerically simulated by using the SCAPS- 1D device simulation tool. The cells with a ZnSe, Zn(O,S) and (Zn,Mg)O buffer layers were compared with the reference CdS buffer layer. The investigation of ZnSe, Zn(O, S) and (Zn,Mg)O-based cells to substitute the traditional CdS in the future shows that the ZnSe-buffer layer is a potential material to replace CdS, which revealed the best efficiency of 20.76%, the other electrical parameters are: JSC = 34.6 mA/cm2, VOC = 0.76 V and FF = 79.6%. The losses as a function of the temperature are estimated at 0.1%/k. among all k.nds of buffer layers studied. We have also shown that the use of a high band-gap buffer layer is necessary to obtain a better short-circuit current density JSC. From our results, we note that the chalcogenide solar cells with Zn-based alternative buffer layer have almost the same stability thatthe traditional CdS buffer layer solar cells have.

关键词： Thin Film Solar Cells CIGS Absorber Alternative Buffer layers SCAPS-1D Electrical Parameters

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Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(Bila_xFe_(1-x)O_3)–0.5(PbTiO_3)

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 847-857页

作者： Ajay k.mar Behera N.k.Mohanty S.k.Satpathy Banarji Behera P.Nayak Materials Research laboratory School of PhysicsSambalpur University

The lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5（Bi laxFe1-xO3）–0.5（Pb Ti O3）（x = 0.05,0.10,0.15,0.20）（BLxF1-x-PT） were prepared by mixed oxide *** characterization was performed by X-ray diffraction and shows a tetragonal structure at room *** lattice parameter c/a ratio decreases with increasing of la（x = 0.05–0.20） concentration of the *** effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range（102–106Hz） at different *** nature of Nyquist plot confirms the presence of bulk.effects only,and non-Debye type of relaxation processes occurs in the *** electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the *** ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures（200–300 ℃）.

关键词： X-ray diffraction Composite materials Impedance spectroscopy Modulus studies Activation energy Relaxation phenomena

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Effects of large-Scale Climatic Oscillations on the Variability of the Indian Summer Monsoon Rainfall

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Journal of Meteorological Research 2023年第3期37卷 341-352页

作者： Deepak.MEENA Athira k.Sarmistha SINGH Department of Civil Engineering Indian Institute of TechnologyPalakkadKerala 678557India

In India,large-scale climatic oscillations have strong influences on the Indian summer monsoon rainfall(ISMR),which plays a crucial role in India’s agricultural production and economic ***,there are limited studies in India that explore the influences of decadal and multidecadal oscillations on the ISMR and associated El Niño–Southern Oscillation(ENSO).Therefore,in this study we carried out a comprehensive and detailed investigation to understand the influences of ENSO,Pacific decadal oscillation(PDO),and Atlantic multidecadal oscillation(AMO)on ISMR across different regions in *** statistical significance of ISMR associated with different phases(positive/warm and negative/cold)of ENSO,PDO,and AMO(individual analysis),and combined ENSO–AMO,and ENSO–PDO(coupled analysis)were analysed by using the nonparametric Wilcoxon rank.Sum(WRS)*** individual analysis results indicate that in addition to the ENSO teleconnection,AMO and PDO significantly affect the spatial patterns of *** analysis was performed to understand how the phase shift of PDO and AMO has modulated the rainfall during El Niño and la Niña *** results indicate that the la Niña associated with a positive PDO phase caused excessive precipitation of about 21%–150%in the peninsular,west–central,and hilly regions compared to the individual effect of ENSO/PDO/AMO on ISMR;similarly,the west–central,coastal,and northwest regions received 15%–56%of excessive ***,during the El Niño combined with PDO positive(AMO positive),above-normal precipitation was observed in hilly,northeast,and coastal(hilly,northeast,west–central,and coastal)regions,opposite to the results obtained from the individual ENSO *** study emphasizes the importance of accounting the decadal and multidecadal forcing when examining variations in the ISMR during different phases of ENSO events.

关键词： climatic oscillation Indian summer monsoon rainfall(ISMR) El Niño-Southern Oscillation(ENSO) Atlantic multidecadal oscillation(AMO) Pacific decadal oscillation(PDO) Wilcoxon rank.Sum(WRS)test

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锥角堆积模型应用——f电子组元素新类型金属有机化合物的推测与合成

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化学学报 1984年第11期42卷 1214-1217页

作者：李醒夫 Fischer,R.D Bagnall,k. W. 中国科学院高能物理所应用部 Institute Department of Chemistry University of Manchester England 北京 für Anorganische und Angewandte Chemie Universit(?)t Hamburg

过渡金属有机化合物一般遵守18或16电子规律.但对于d电子组的前几个元素(Ti,Zr,Hf)和f电子组元素却并不如此.Mark.提出过:铀(IV)、钍(IV)的某些有机化合物分别遵循20或22电子规律.但这种观点无法解释许多实际存在的化合物.我们在最近提... 详细信息

过渡金属有机化合物一般遵守18或16电子规律.但对于d电子组的前几个元素(Ti,Zr,Hf)和f电子组元素却并不如此.Mark.提出过:铀(IV)、钍(IV)的某些有机化合物分别遵循20或22电子规律.但这种观点无法解释许多实际存在的化合物.我们在最近提出:当配位场作用很弱时,空间堆积作用是不容忽视的.在中心离子周围配位体的堆积达到一定程度时,尽管从表观上看,中心离子的外层电子与配位电子数之和还没有达到“下一级惰性气体结构”,但配位体之间的相互推斥作用阻止了更多的配体进入配位层.从几何角度来进行研究时,这种由空间堆积效应与成键效应达成的平衡应当表现为:化合物结构中配位体的立体角系数(Solid Angle Factor,Q/4π)之总和(SAS)分布在一个“稳定区间”之内.而后者的位置与金属的氧化态有关.我们先后对近300个已知的f电子组元素的配合物与金属有机化合物的结构进行了计算.结果表明中心离子周围的空间占据呈现“饱和”现象.饱和堆积程

关键词：金属有机化合物有机金属化合物中心离子堆积模型配阴离子配位层配位数配离子锥角电子轻子

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Absorption density control in waveguide photodiode- analysis, design, and demonstration

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Frontiers of Optoelectronics 2014年第3期7卷 385-392页

作者： Dingbo CHEN Jeffery BLOCH Rui WANG Paul k. L. YU Department of Electrical and Computer Engineering University of California San Diego 9500 Gilman Dr La Jolla CA 92093 USA

A modal analysis is conducted for analyzing the absorption profile of high power waveguide photodiodes designed for analog optical link. The excitation of guided modes with large filling factor in the absorber is identified as a limiting factor for the performance of waveguide photodiodes at high optical power, including power handling capability, and bandwidth-efficiency product. A waveguide photodiode design, which spatially separates the input waveguide from the absorber in the lateral direction, is analyzed and experimentally demon- strated to suppress the excitation of mode with large filling factor. Photocurrent 〉 60 mA under - 4 V bias is measured, with 0.80 A/W responsivity. This design illustrates that high power handling capability can be achieved without compromising the bandwidth-efficiency product.

关键词： photodiode waveguide thermal failure high power mode excitation

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热障涂层用新型复合氧化物的制备及其热物理性能

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机械工程材料 2022年第7期46卷 27-31,37页

作者：冉书明重庆水利电力职业技术学院智能制造学院重庆402160

以高纯度la_(2)O_(3)、MgO、SrCO_(3)、CeO_(2)和Ta_(2)O_(5)为原材料,采用多步高温固相烧结法制备了Sr_(3)la_(3)Ce_(7)Ta_(2)O_(26.5)和Mg_(3)la_(3)Ce_(7)Ta_(2)O_(26.5)氧化物,研究了其晶体结构、微观形貌和热物理性能。结果表明:所合成的氧化物具有单一焦绿石结构,其显微组织致密,晶界清晰,元素种类和原子比与化学式基本一致;Sr_(3)la_(3)Ce_(7)Ta_(2)O_(26.5)的热膨胀系数大于Mg_(3)la_(3)Ce_(7)Ta_(2)O_(26.5),二者在1000℃时的热膨胀系数分别是11.6×10^(-6),11.37×10^(-6) k.(-1),明显大于7YSZ的9×10^(-6) k.并且二者在高温下均具有良好的晶体结构稳定性;Sr_(3)la_(3)Ce_(7)Ta_(2)O_(26.5)和Mg_(3)la_(3)Ce_(7)Ta_(2)O_(26.5)在1200℃时的热导率分别为1.68,1.87 W·m^(-1)·k.(-1),均低于7YSZ的2 W·m^(-1)·k.(-1);Sr^(2+)较大的离子半径和原子质量导致Sr_(3)la_(3)Ce7Ta_(2)O_(26.5)的热导率低于Mg_(3)la_(3)Ce_(7)Ta_(2)O_(26.5);合成氧化物的热导率和热膨胀系数均满足热障涂层的要求。

关键词：复合氧化物热障涂层热导率热膨胀系数

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Passive seismic velocity tomography on longwall mining panel based on simultaneous iterative reconstructive technique (SIRT)

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Journal of Central South University 2012年第8期19卷 2297-2306页

作者： N.Hosseini k.Oraee k.Shahriar k.Goshtasbi Department of Mining Engineering South Tehran BranchIslamic Azad UniversityTehran 17776-13651Iran Department of Management University of StirlingStirling FK94LAUK Department of Mining and Metallurgical Engineering Amirkabir University of TechnologyTehran 15916-34311Iran Department of Mining Engineering Tarbiat Modares UniversityTehran 14115-111Iran

Mining operation, especially underground coal mining, always has the remark.ble risk. of ground control. Passive seismic velocity tomography based on simultaneous iterative reconstructive technique （SIRT） inversion is used to deduce the stress redistribution around the longwall mining panel. The mining-induced microseismic events were recorded by mounting an array of receivers on the surface, above the active panel. After processing and filtering the seismic data, the three-dimensional tomography images of the p-wave velocity variations by SIRT passive seismic velocity tomography were provided. To display the velocity changes on coal seam level and subsequently to infer the stress redistribution, these three-dimensional tomograms into the coal seam level were sliced. In addition, the boundary element method （BEM） was used to simulate the stress redistribution. The results show that the inferred stresses from the passive seismic tomograms are conformed to numerical models and theoretical concept of the stress redistribution around the longwall panel. In velocity tomograms, the main zones of the stress redistribution arotmd the panel, including front and side abutment pressures, and gob stress are obvious and also the movement of stress zones along the face advancement is evident. Moreover, the effect of the advance rate of the face on the stress redistribution is demonstrated in tomography images. The research result proves that the SIRT passive seismic velocity tomography has an ultimate potential for monitoring the changes of stress redistribution around the longwall mining panel continuously and subsequently to improve safety of mining operations.

关键词： longwall mining passive seismic velocity tomography simultaneous iterative reconstructive technique (SIRT) boundary element method stress redistribution ground control

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