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MF30型袖珍万用电表一些故障的排除与预防
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作者 孙永宽 《电世界》 1998年第7期31-31,共1页
MF30型袖珍万用电表是工矿企业常用的电工仪表之一。其电气原理见附图。现就其在现场使用中出现的故障及排除方法和预防措施介绍如下: 1.'Ω'档 (1)'×1'档位读数值偏大,而其余档位正常。原因:'×1'档... MF30型袖珍万用电表是工矿企业常用的电工仪表之一。其电气原理见附图。现就其在现场使用中出现的故障及排除方法和预防措施介绍如下: 1.'Ω'档 (1)'×1'档位读数值偏大,而其余档位正常。原因:'×1'档位回路中的23.2Ω色环电阻过热变值或烧坏。 展开更多
关键词 万用电表 故障排除 故障预防 mf30
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模拟失重对大鼠比目鱼肌梭内肌纤维肌球蛋白重链表达的影响(英文) 被引量:6
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作者 唐斌 樊小力 吴苏娣 《航天医学与医学工程》 CAS CSCD 北大核心 2003年第4期235-238,共4页
目的检查模拟失重对大鼠比目鱼肌梭内肌纤维肌球蛋白重链表达的影响 ,探讨模拟失重所致肌梭退变的机制。方法采用免疫过氧化酶反应ABC法观察尾悬吊 7d ,1 4d与对照组大鼠比目鱼肌梭内肌纤维对特异性抗小鸡肌球蛋白重链慢紧张型 (ALD5 8... 目的检查模拟失重对大鼠比目鱼肌梭内肌纤维肌球蛋白重链表达的影响 ,探讨模拟失重所致肌梭退变的机制。方法采用免疫过氧化酶反应ABC法观察尾悬吊 7d ,1 4d与对照组大鼠比目鱼肌梭内肌纤维对特异性抗小鸡肌球蛋白重链慢紧张型 (ALD5 8)和快缩型 (MF30 )单克隆抗体表达的差别。结果梭外肌纤维不与ALD5 8和MF30起反应。这两种抗体仅与梭内肌纤维反应。核袋 1和核袋 2纤维对ALD5 8抗体起反应。核袋 2和核链纤维对MF30抗体起反应。尾悬吊 7d后 ,核袋 1和核袋 2纤维对ALD5 8的免疫反应性降低 ,而核袋 2和核链纤维对MF30免疫反应性增强。尾悬吊 1 4d后 ,核袋 1和核袋 2纤维对ALD5 8的免疫反应性明显降低 ,甚至消失。而所有的梭内肌纤维对MF30都起免疫反应 ,并且明显增强。 展开更多
关键词 失重模拟 尾吊 肌球蛋白 重链表达 ALD58 mf30 肌梭
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万用表直流电压的测量误差
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作者 李石玉 《河北民族师范学院学报》 1991年第3期5-6,共2页
当调节RW使Ie=0.87mA时,用一块ME30型万用表的5V电压档测得晶体管发射极电压Ve=4.45V,基极电压Vb=2.40V.由于Vbe=Vb-Ve,根据测得的数据,则Vbe=2.40V-4.50V=-2.05V.我们知道,三极管正常工作时,发射结应正偏.硅管的发射结导通电压Vbe】0.... 当调节RW使Ie=0.87mA时,用一块ME30型万用表的5V电压档测得晶体管发射极电压Ve=4.45V,基极电压Vb=2.40V.由于Vbe=Vb-Ve,根据测得的数据,则Vbe=2.40V-4.50V=-2.05V.我们知道,三极管正常工作时,发射结应正偏.硅管的发射结导通电压Vbe】0.5V.而图中的3DG6(硅管)的Vbe=-2.05V.因此,发射结反偏,管子应处于截止状态.可是,如果管子截止,Re上的电压Ve=4.45V又是从哪里来的呢?这不能说不是一个奇怪的现象. 展开更多
关键词 万用表 测量误差 直流电压档 发射结 档位 mf30 电表内阻 发射极电阻 块表 并联
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Visual function and optical quality after bilateral implantation of zonal refractive multifocal IOL in elderly patients
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作者 Chen Jun Qiu Xinying +1 位作者 Zhu Jie Wei Yuanjian 《国际眼科杂志》 2026年第4期551-557,共7页
AIM:To evaluate the visual function and optical quality in adults aged 80y and older following the bilateral implantation of zonal refractive multifocal intraocular lens(IOL,LS-313 MF30).METHODS:A single-center,non-ra... AIM:To evaluate the visual function and optical quality in adults aged 80y and older following the bilateral implantation of zonal refractive multifocal intraocular lens(IOL,LS-313 MF30).METHODS:A single-center,non-randomized,prospective clinical trial was conducted,involving cataract patients aged 80 y and older.Patients received bilateral implantation of the LS-313 MF30 or CT Asphina 409MP,based on personal preference.Postoperative assessments included uncorrected and corrected visual acuity at distance,intermediate,and near ranges,as well as defocus curve.Subjective evaluations were performed using the visual function(VF-14)questionnaire,spectacle independence rates,and patient satisfaction surveys.Photic phenomena such as glare,halos,and starbursts were also analyzed.RESULTS:The MF30 group(16 eyes from 8 participants,85.38±2.56 y)exhibited superior uncorrected and corrected intermediate and near visual acuity compared to the 409MP group(26 eyes from 13 participants,85.77±2.20 y),while distance visual acuity was comparable between groups.The defocus curve of the MF30 group revealed two peaks at 0.00 D and-3.00 D,indicating a broader depth of focus.Patients in the MF30 group reported higher rates of spectacle independence and greater satisfaction.While photic phenomena such as glare(28.6%vs 18.5%,P=0.584),starburst(9.5%vs 3.7%,P=0.567)and halos(23.8%vs 11.11%,P=0.438)were more prevalent in the MF30 group,they were generally mild and did not significantly impact daily activities.CONCLUSION:Zonal refractive multifocal IOLs provide elderly patients with improved distance and near vision,greater spectacle independence,and greater satisfaction.Although photic phenomena were slightly more frequent with MF30,they are generally reported as non-disruptive and do not affect their daily life compared to monofocal IOLs. 展开更多
关键词 zonal refractive multifocal intraocular lens aged 80 years and older LS-313 mf30 cataract surgery non-randomized prospective clinical trial
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