检索结果-南通市图书馆

Ultrasound Causes of Female Infertility at the Fertilia Medical Clinic in Bamako

Open Journal of Medical Imaging 2023年第3期13卷 107-113页

作者： Mamadou Dembele Alassane Kouma Ilias Guindo Zoumana Cheick Berete Souleymane Sanogo Mamadou N'diaye Brahima Doumbia Oncoumba Diarra Ousmane Traore Issa Cisse Aboubacar Sidiki N’ Diaye Badiougou Doucoure youssouf yalcouye Adama Diaman Keita Siaka Sidibe Radiology Department Faculty of Medicine and Odonto-Stomatology of Bamako (FMOS) Bamako Mali Radiology Unit Fertilia Medical Clinic Bamako Mali Department of Education and Research in Public Health (DERSP) FMOS Bamako Mali

Aims: Infertility is a major problem in our current societies and the Fertilia medical clinic in Bamako is a center for medical assistance in procreation (MAP) where there is an increasingly growing demand for ultrasound. The objective of our study was to investigate the ultrasound causes likely to prevent the occurrence of pregnancy in a group of infertile and subfertile women. Subjects and Methods: This was a 5-year cross-sectional and prospective study, between January 2017 and January 2022, which involved 250 women wishing to become pregnant (infertile or subfertile), who came for pelvic ultrasound or follicular monitoring and who agreed to participate in our study. The parameters used were ultrasound reports including uterine, ovarian and tubal pathologies. It should be noted that in some cases no ultrasound cause of infertility was found. Data were entered and analyzed in SPSS. Results: 250 women were recruited into our. The average age was 32 years with extremes ranging from 17 to 51 years. 179 patients or 71.6% were between 17 and 35 years old. 139 patients or 55.6% had secondary infertility against 44.4% primary infertility. 202 patients or 80.8% had at least one ultrasound lesion and 48 patients or 19.2% had no significant ultrasound abnormality. The most represented ultrasound lesions were of uterine origin with 72.20%, 23.7% ovarian lesions and 04% tubal lesions. Uterine lesions were dominated by myomas, adenomyosis, endometrial polyps, uterine malformations and synechiae. As for ovarian lesions we noted cysts, polycystic ovary syndrome (PCOS), ovarian endometriosis, non-follicular ovaries and tubal ultrasound lesions showed unilateral or bilateral hydrosalpinx. Conclusion: In our study, ultrasound was an invaluable contribution to the diagnosis of the causes likely to explain subfertility and infertility in our respondents. She highlighted uterine, ovarian and tubal lesions, some of which could be corrected and pregnancies ensued.

关键词： Ultrasound Female Infertility Myomas Polycystic Ovaries Hydrosalpinx

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ultrasound Causes of Female Infertility at the Fertilia Medical Clinic in Bamako

引用

Open Journal of Medical Imaging（医学影像期刊） 2023年第3期

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Simulation Study on Asphaltene Precipitation and Deposition During Gas Injection in Reservoir

Simulation Study on Asphaltene Precipitation and Deposition ...

引用

作者： Abakar youssouf Adoum 中国石油大学(北京)

学位级别：硕士

Oil is an essential element of global economic *** technology for enhanced oil recovery being developed to increase the volume of recoverable *** injection is among the most common EOR methods,but the injection of gas can cause asphaltene precipitation,which can cause serious reservoir *** main problem to be solved in this study is the formation of asphaltene during gas for recovering more *** to the seriousness of the situation,we wanted to do the study with the goal of determining and recommending the best of these two new processes of EOR gas injection,gas-alternating gas(GAG),triple-alternating gas alternating gas(TAG),and the conventional water-alternating gas(WAG).The main parameters taken into consideration for carrying out this study are the injection pressure,the injection rate,and the cycle *** is essential to create a asphaltene precipitation and deposition model in porous reservoir *** model is based on specific properties of petroleum fluid and asphaltene precipitation data collected in literature *** is considered a pure *** component of the fluid is based on representing the precipitated asphaltene as a pure dense phase and dividing the heavy components of the fluid sample into non-precipitating and precipitating *** property data is validated and mapped to the equations of state(EO).In the simulation runs,the effect of each GAG,WAG,and TAG parameter was acclaimed by adjusting the input one at a time while retaining the others *** results showed that the information with the most significant influence is just the injection *** greater injection pressure,the fewer asphaltene precipitates and *** other variables have a minor impact on the precipitate *** to the findings,it is possible to conclude that adjusting the pressure of the gas injection and the cycle of the injection will regulate the number of asphaltenes will precipitate and deposit

关键词： Asphaltene Precipitation Deposition Gas injection(WAG,GAG,TAG process) CMG/GEM

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

The Relevance of Biological and Hydrodynamic Timescale in the Growth of Plankton

引用

Open Journal of Modelling and Simulation 2023年第4期11卷 117-128页

作者： Yaya youssouf Yaya Département de Mathématiques Ecole Normale Supérieure de N’djaména N’djaména Chad Laboratoire de Mathématiques et Application Université Assane Seck de Ziguinchor Ziguinchor Senegal

The relationship between hydrodynamic mesoscale structures and plankton formation in the wake of an island, as well as its interaction with a coastal upwelling, is investigated. Our focus is on the process by which vortices create localized plankton blooms. A basic three-component model for marine ecology was utilized, as well as a coupled system of kinematic flow that mimicked the mesoscale features underlying the island. We show that the prevalence of localized plankton blooms is produced mostly by the prolonged residence times of nutrients and plankton in the island’s vicinity, as well as the confinement of plankton within vortices.

关键词： Plankton Upwelling Vortices Nutrient Limit Cycle

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structure and Reproductive Performances of Sahelian Goats in the Guera Region, in Central Chad

引用

Open Journal of Animal Sciences 2014年第4期4卷 175-181页

作者： Logténé youssouf Mopaté Vounparet Zeuh Issa youssouf Adoum Djimtoloum Nadjissara Livestock Polytechnic Institute of Moussoro Moussoro Chad Livestock Research Institute for Development (LRID) ex Zootechnical and Veterinary Research Laboratory N’Djamena Chad University Institute of Sciences and Techniques Abeche Chad

The purpose of the study was to establish the structure of monitored animal farms and determine reproductive parameters of Sahelian goats in the Guera Region, in Central Chad. Data were collected through longitudinal survey in 27 observatory farms during three years using goats identified by numbered ear tags. The herds were composed on average of about 71% of females. The age pyramid covering all years showed a significant number of males aged between 0 - 1 year and perceptible fall thereafter. However, some stability was observed in the class of the 2 - 8 years old among females. The frequencies of accumulated kiddings showed that 44% of births occurred in the rainy season against 28% respectively in the cool dry and hot dry seasons. Obtained reproduction parameters were: a sex ratio of 0.51 in favor of males, a kidding interval of 10.6 months with significant differences (P < 0.05) according to the rank of birth, an age at first kidding of 16.5 months for females born in monitoring and an age of 20.3 months for all first-kidding, giving an apparent fertility rate of 145%, a fecundity rate of 116% and an abortion rate of 2%. The composition and structure of herds have highlighted the importance of females to ensure the reproducibility of goat production systems. The determined reproduction parameters are references for actions to improve goat rearing in this area.

关键词： Breeding Goats Structure Reproduction Sahel Zone Guera Chad

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structure and Composition of Macroinvertebrates during Flood Period of the Nokoue Lake, Benin

引用

Open Journal of Ecology 2016年第2期6卷 62-73页

作者： Hamed Odountan youssouf Abou Laboratory of Ecology and Aquatic Ecosystem Management Department of Zoology Faculty of Sciences and Technics University of Abomey-Calavi Abomey-Calavi Republic of Benin

The Nokoue Lake is the largest lake of Benin Republic and it is also considered as one of the most productive lagoon ecosystems in West Africa. This productivity is decreasing and thus raises productivity issue for a better management and conservation. Macroinvertebrate can be useful for this purpose. A study was conducted to assess the spatial variation of macroinvertebrates during high flood period. A total of 3892 macroinvertebrates of fresh and brackish water were sampled during the survey. Structural analysis of the macroinvertebrate community revealed that it was made up of 16 orders, 48 families and 66 genera dominated by Insecta compared to Mollusca, Crustacea and the Annelida. Insects were dominated by Diptera (Chironomus sp. and Tanytarsus sp.), Coleoptera (Dystiscidae) and accounted for 57.1% of the sampled population. Mollusca, Crustacea, Annelida and Arachnida were the following most abundant and represented 23.9%, 10.7%, 8.1% and 0.2% of the total population, respectively. The Evenness index of Pielou was higher on the Station 8 (0.91 - 0.97), close to Oueme River. However, no significant difference (p > 0.05) was observed neither between station nor between month on the Shannon-Wiener index (2.06 - 4.31), Simpson index (0.04 - 0.40) and the taxa number (10 - 27). Macroinvertebrate assemblages and composition were primarily due to changes in water quality dependent on hydroclimatic changes and probably to anthropogenic actions. This suggests the need for real investigation of the macroinvertebrate biological capacity when formulating conservation strategies for the Nokoue Lake.

关键词： Nokoue Lake Macroinvertebrate Community Structure Flood Period Dominant Taxa

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Past, Present and Future of Urban Agriculture in Cameroon: Major Contemporary Challenges (1993-2017)

引用

Journal of Agricultural Chemistry and Environment 2022年第1期11卷 1-14页

作者： Theodore Ngoufo Sogang youssouf Monkouop University of Dschang Dschang Cameroon

In the 21st Century, Food and Agricultural stakes are sinuously rushing in a difficult legible heading. Crossing a transitory phase period between Agriculture, Traditional, Urban and Modern, the affirmation of a conquering alimentary identity and Nationalist openings is confuse with an Extraordinary Demographic Period of human scale history. Millions of people are worried about the innovation of urban agriculture for food and health security. Food education at the confines of the world’s greatest stakes proves necessary, since the order oneself retreat combines with the passion of solidarity and social progress, advance in technology, facilitating our life at same time generating new threats for citizenship. In this Article, we propose another way of reading the heterogeneous world of yesterday, today and tomorrow. Not only for Historians but also by associating Scientific Relations of Social and Human Researchers. Such a step is necessary to endorse the word of reading, for comparism and review of an agriculture in full mutation. It also instigates by referring to History, Social force, Economic stakes and Diplomatic globalization food teste, intention and invention, which change with the everyday society. You will find out that analysis done in this article are sometime completely done events through original texts, assembled around the five fundamental notions: International Relations and Geopolitical Agriculture of yesterday;Yesterday Urban Economic Agriculture;Environmental and Food Climate Stakes, Science and Culture adapted to agriculture and food mutations.

关键词： Yesterday Urban Agriculture Food Stakes Geopolitics of Agriculture Contemporary World

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Can Macroinvertebrate Assemblage Changes Be Used as Biological Indicator of Water Quality of the Nokoue Lake (Benin)?

引用

Journal of Environmental Protection 2015年第12期6卷 1402-1416页

作者： Hamed Odountan youssouf Abou Research Unit on Wetlands Department of Zoology Faculty of Sciences and Technics University of Abomey-Calavi Abomey-Calavi Benin

Investigations on biological capacity of water quality of macroinvertebrate community are very uncommon, and such as the amount of information available on the Nokoue Lake (the largest lake of Benin) is very limited. This information gap needs to be filled for better management of the Nokoue Lake. The goal of this study was to evaluate the possibility of using the macroinvertebrate community structures in Nokoue Lake and the environmental factors responsible for the maintenance of these structures. Nokoue Lake was studied over three months, during high flood period in which time subsurface water and macroinvertebrate samples were collected and analyzed. A study showed that the macroinvertebrate assemblages was done according to ecological gradients as pH, conductivity, TDS, salinity, chlorophyll a and probably to anthropogenic actions (nutriments). Better than the percentage of insects, the percentage of Chironomidae informed very well about macroinvertebrate assemblages. To assess the biological health of the environment, the Family Biotic Index (FBI) turns out to be more appropriate than diversity indices that do not take into account the intermediate pollution. Organic pollution revealed by the FBI probably affects the aquatic life.

关键词： Nokoue Lake Macroinvertebrates Family Biotic Index Flood Period Diversity Indices

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

桥梁混凝土温度裂缝的原因与分析

桥梁混凝土温度裂缝的原因与分析

引用

作者： Amine youssouf Tahir 重庆大学

学位级别：硕士

桥梁工程施工及竣工后使用中,裂缝会严重影响桥梁质量,以及桥梁的使用寿命,因此全面分析桥梁混凝土裂缝产生的原因,采取积极有效的解决方案,意义重大。文章阐述了混凝土裂缝产生的原因,分析了裂缝控制措施和方法,以延长混凝土桥梁的使... 详细信息

桥梁工程施工及竣工后使用中,裂缝会严重影响桥梁质量,以及桥梁的使用寿命,因此全面分析桥梁混凝土裂缝产生的原因,采取积极有效的解决方案,意义重大。文章阐述了混凝土裂缝产生的原因,分析了裂缝控制措施和方法,以延长混凝土桥梁的使用寿命。大体积混凝土裂缝是道路与桥梁工程中的一大难题。这些大体积混凝土结构不受到外部载荷影响,水合热引起的温度变化和由混凝土收缩引起的温度应力是裂缝的主要原因。因此,在大体积混凝土结构施工中热应力和温度的控制具有重要意义。温度裂缝会破坏结构整体性,并在施工时降低结构耐久性。另外,在结构服役期,温度变化对结构的应力变化会有很大的影响。针对桥梁温度裂缝的原因与分析,讨论了大体积混凝土的温度监测和裂缝控制方案。混凝土硬化过程中热量的产生会引起早期温度上升,如果混凝土体积受到限制,则会引起热应力,从而导致早期的热裂缝。此问题应该在具体的桥梁施工中得到适当考虑,因为桥墩以及其他结构构件通常是大体积混凝土构件。在本文中,温度进行研究,测量其现场的早期温度升高。进行了有限元分析以评估桥墩引起的温度分布和热应力的变化。测量和分析结果表明了热裂缝风险评估和温度控制措施的规划。为解决施工中混凝土易开裂的问题,究介绍了混凝土结构的裂缝产生机理。温度差异和体积限制是裂缝的主要成因。防裂措施应着重于优化混凝土配比,提高施工技术水平。本研究采用数值模拟计算来模拟实际施工过程和温度控制措施,分析了裂缝的产生原因,并选择了合理的温度控制措施。对大体积混凝土结构进行了三维有限元分析。讨论裂缝的原因,提出可行的抗裂措施,为项目建设提供技术支撑。近年来钢管混凝土组合桥墩被广泛用于多条高速公路施工现,其已改进能适用于高桥墩的快速施工和抗震。由于结构特点,伴随浇筑混凝土的热应力影响容易产生裂缝。对一些桥梁混凝土施工现场进行了调查,通过三维热分析模拟了实际温度变化,并进行了热应力分析,阐明了开裂机理,部分案例主要涉及施工。根据采用模拟获得的材料热值结果,提出了一些有效的测量来控制裂纹。

关键词：桥梁裂缝原因温度混凝土

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

吉布提与中国关系研究：机遇、挑战与展望

吉布提与中国关系研究：机遇、挑战与展望

引用

作者： Ahmed Djama youssouf 吉林大学

学位级别：硕士

近年来,中国与吉布提之间的关系稳步发展,两国关系日益友好。机遇、挑战和前景是分析中吉关系的重要因素。两国之间存在的机遇,如2013年以来中国在港口、铁路、公路和管道等基础设施方面大力支持投资;二者也存在众多挑战,比如债务,这是... 详细信息

近年来,中国与吉布提之间的关系稳步发展,两国关系日益友好。机遇、挑战和前景是分析中吉关系的重要因素。两国之间存在的机遇,如2013年以来中国在港口、铁路、公路和管道等基础设施方面大力支持投资;二者也存在众多挑战,比如债务,这是最主要的挑战,由于吉布提与中国的利率相当高,政府意识到其规模之后正在努力偿还债务。鉴于中吉两国的友好合作关系,预计未来两国关系将进一步发展。本文研究问题涉及:中国与吉布提的特殊关系的原因是什么?这个亚洲巨人和这个非洲小国的战略伙伴关系有什么变化吗?第一个问题我的回答是,中国与吉布提有着特殊的关系,这是因为它的地理位置至关重要,大国在这片领土上竞相争夺这个战略地区。吉布提占有4%的全球航运过境,也有利于中国的“一带一路”倡议项目,同时吉布提也是连接非洲大陆的关键中心,这使得吉布提成为该地区的物流和贸易枢纽。第二个问题的答案是,鉴于两国政府承诺密切合作,两国在过去十五个月所经历的事态发展正在顺利地进展;吉布提政府为获得中国对其发展的财政支持开始加强与中国的伙伴关系,尽管法国和西方国家在难民方面投资吉布提,但吉布提政府没有给予回应,而是转向了中国。中国大规模资助了吉布提很多非常重要的项目,使两国的合作和经济发展更加紧密。我在本文中使用了三种研究方法:档案审查——在我的研究过程中,我收集了文章,期刊,政府报告,国际组织报告,非洲银行报告,世界银行报告,杂志,书籍,阅读和理解了这些内容,从中过滤和分析获得了有用的信息,进而进入写作和进行研究的阶段。描述性叙述——我的论文大部分是定量的,用以丰富文章内容,定性的部分是我的分析和反思。在数据方面,我的文章字数足够但缺乏数据。采访——我就我的问题与我所研究的领域的人进行讨论、交流,是为了向大家收集新的想法。在谈到吉布提-中国时,我的研究论述了决定因素,机遇,挑战和前景。本研究由五章组成:第一章是引言,介绍了中国与吉布提具有特殊关系的原因,以及两国目前的战略伙伴关系,这在这个问题上,我的研究给予了更多的解释性细节,这也解释了进行这项研究的重要性。这一部分运用了三种方法来收集信息,首先是收集信息,其次是定量研究和定性研究,特别是我的报告是描述性和叙述性的,最后采访的目的是为了收集更多的想法,这一部分还总结了一些作家,知识分子,正在做这个问题的研究的文学评论的观点,介绍了中吉关系的发展、伙伴关系的发展、中吉关系的影响,以及中吉合作的前景。第二章介绍了吉布提的地理位置和国际形势;吉布提位于东非地区的重要战略位置上,该国对于在吉布提域内打击海盗和恐怖主义的外国军队具有至关重要的作用,这些行动能够确保海上航行能够正常进行。在这个洲际和地区间交易频繁的十字路口,世界上三分之一的货物都要经过这里。吉布提也是通往非洲的门户,这赋予了其独特的优势,吉布提是一个稳定的国家,是交流和相遇的地方,全球10%的移民共存于此。该国提供了重要的全球和区域出口,也是埃塞俄比亚,北苏丹,肯尼亚和其他非洲共同市场的国家进口中国商品和资本流动的联络处。本部分还将提到吉布提的优势,它是红海的灯塔,将吉布提打造成非洲的商业和物流中心,使其具有区域和国际层面上的雄心壮志,是符合该国促进发展和经济增长的议程。这是国家的优先事项,也是政府致力于使吉布提成为中国商品进出口到东非的资本中心。对吉布提进行改造,使其成为像新加坡那样的港口国家,这也是中国BIS项目的潜在动力。吉布提同时具有不足之处,例如其面积狭小、季节性干旱的气候、缺乏自然资源;该国缺乏农业能力,还需要从外部进口粮食,粮食通货膨胀与政治危机关系密切,导致该国易受外部冲击的影响。第三章介绍了吉布提与中国双边关系的发展;吉布提独立两年后,中国在外交上承认了这个年轻的国家,并于1979年与吉布提互派外交使团,保持了良好合作外交关系。目前,两国已经建立了深厚的关系,不仅局限于公共建筑的建设,而且通过新的积极主动的大规模融资下的必要发展项目来实现,但现在缺乏资金支持来将发展具体化。中国欢迎和理解支持吉布提的发展,两党的合作进展迅速,政治访问以及派遣学生都有了长足的发展。2001年吉布提向北京派遣了第一个外交使团是两国关系中的重要事件。本部分还详细介绍了中国在吉布提的投资情况,两国签署了144亿美元的协议,完成了吉布提国际港的现代化改造。包括第一级石油过境码头的改造,亚的斯亚贝巴-吉布提铁路线的翻新和电气化,以及通往埃塞俄比亚的公路,还建立了便利中资银行运营的法律框架,建立了旨在改善物流和成本的统一海关系统,建立了一个专门从事规章业务和人民币结算的中心。这一部分还涉及从传统伙伴到战略伙伴的合作发展;两国有着悠久的关系;在吉布提独立后的几年里,中国通过社会福利项目向吉布提政府和人民提供了援助,如果说中国这样做是因为它与吉布提有着共同的外交理念,两国计划合作投资重大发展项目,其

关键词：关系伙伴关系与合作战略协作

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：