简介:摘要:暴露在自然雷电环境中的飞机有源频率选择表面结构面临电子器件的烧蚀毁伤和电磁性能可调节能力受损的风险,严重威胁飞机的正常飞行。基于磁流体动力学理论,本文建立了有源频率选择表面的雷电直接效应放电数值模型,分析了雷击电压波形下有源频率选择表面的雷电间隙击穿过程,结果表明雷电弧从激发到附着所用的时间为纳秒量级,有源电磁功能层在雷电大电流直接效应下会发生失效和损毁,无法耐受雷电直接效应的影响。
简介:目的:探讨LEEP术(宫颈环形电切术)治疗宫颈疾病的手术指症,并发症及预防措施。方法:对我院的宫颈疾病患者200例使用LEEP刀治疗情况做一回顾性分析探讨其手术效果及其并发症。结果:手术成功率99%,并发症发生率15%,手术平均时间10分钟平均出血量20ml。结论:LEEP刀手术是一种安全,有效,快速,微创的治疗宫颈病变的方法。
简介:AbstractBackground:The elimination of Plasmodium vivax malaria requires 8-aminoquinolines, which are contraindicated in patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency due to the risk of acute haemolytic anaemia. Several point-of-care devices have been developed to detect G6PD deficiency. The objective of the present study was to evaluate the performance of two of these devices against G6PD genotypes in Mauritania.Methods:Outpatients were screened for G6PD deficiency using CareStart™ rapid diagnostic test (RDT) and CareStart™ G6PD biosensor in Nouakchott, Mauritania, in 2019-2020. African-type and Mediterranean-type G6PD genotypes commonly observed in Africa were determined by polymerase chain reaction-restriction fragment length polymorphism and sequencing. Qualitative variables were compared using Fisher’s exact test.Results:Of 323 patients (74 males and 249 females), 5 males and 2 homozygous females had the African-type A-genotype: A-(202) in 3 males and 2 females and G6PD A-(968) in 2 males. Among heterozygous females, 13 carried G6PD A-(202), 12 G6PD A-(968), and 3 G6PD A-(542) variants. None had the Mediterranean-type G6PD genotype. Eight had a positive G6PD RDT result, including all 7 hemizygous males and homozygous females with A- or A-A- (0.12 to 2.34 IU/g haemoglobin, according to G6PD biosensor), but RDT performed poorly (sensitivity, 11.1% at the cutoff level of < 30%) and yielded many false negative tests. Thirty-seven (50.0%) males and 141 (56.6%) females were anaemic. The adjusted median values of G6PD activity were 5.72 and 5.34 IU/g haemoglobin in non-anaemic males (n = 35) and non-anaemic males and females (n = 130) with normal G6PD genotypes using G6PD biosensor, respectively. Based on the adjusted median of 5.34 IU/g haemoglobin, the performance of G6PD biosensor against genotyping was as follows: at 30% cut-off, the sensitivity and specificity were 85.7% and 91.7%, respectively, and at 80% cut-off, the sensitivity was 100% while the specificity was 64.9%.Conclusions:Although this pilot study supports the utility of biosensor to screen for G6PD deficiency in patients, further investigation in parallel with spectrophotometry is required to promote and validate a more extensive use of this point-of-care device in areas where P. vivax is highly prevalent in Mauritania.
简介:摘要本文对LW6系列SF6断路器液压操作结构常见的问题进行简要分析,并对处理方法和故障检修的注意事项进行简要论述,以期为LW6系列SF6断路器液压操作机构的稳定运行提供理论参考依据。
简介:整理说明:这篇访谈录,是家属在整理田仲济先生遗稿时发现的。50年代,遵照教育部关于提高师资,培训研究生(进修教师)的要求,1958年5月18日至6月6日,田先生带山东师范学院中国现代文学研究生和高师教师进修班的学生进京,访问了当时“作协”的茅盾、厦衍、叶圣陶、郭小川,“剧协”的田汉、阳翰笙、孟超,文学研究所的郑振铎、何其芳、何家槐、蔡仪、毛星,《文艺报》主编张光年、陈笑雨,《人民文学》的主编张天翼、陈白尘等,人民文学出版社的负责人王任叔、楼适夷,《诗刊L*-编臧克家,曲艺研究会的负责人赵树理、陶钝,人民教育出版社的负责人吴伯箫、张毕来,中央戏剧学院李伯钊等作家,还有北京大学俄语系主任曹靖华,西语系朱光潜,中语系杨晦、吴组缃等教授,三十余人。访谈内容涉猎面相当广,包括文坛现状,作家作品的评价,文学界关注的热点问题,现代文学史有关史实等方面,如文学研究会、太阳社、“左联”等重要社团活动的史料虹实,当年苏区文艺活动的情况,以及叶圣陶谈自己受外国文学的影响,赵树理谈自己与农民的关系,田汉、阳翰笙、陈白尘谈现代戏剧的发展和对话剧的认识,还有臧克家讲析闻一多诗的技巧和继承关系,吴组缃分析茅盾的小说,杨晦谈曹禺的戏剧,王任叔、楼适夷谈巴金、蒋光慈、郁达夫等的创作,学者朱光潜、蔡仪谈美学问题,张毕来谈了文学上的厚古薄今问题,等等。这些作家的谈话和回忆,提供了书面文学史之外的丰富细节,自然,也有亲历者自己参与历史的书写,他们有“1958年”历史的鲜明痕迹。为此,我们不仅仅获得了现代文学史的许多史实史料,更在他们的谈吐言语中感受到了文学史的构成。半个世纪了,1958年浓浓的时代色彩,本身也�