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密封时间对锆英砂中天然核素测量值的影响 被引量:2
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作者 严文勋 封亚辉 +6 位作者 周宇航 许新春 郑建明 戴东情 徐松 陈进 毛欣 《中国辐射卫生》 2017年第4期478-479,492,共3页
目的考察密封时间对锆英砂中天然核素比活度测量值的影响。方法分别密封0、1、4、7、11、15、20和30天,采用HPGeγ谱仪测量锆英砂中四种天然核素^(238)U、^(232)Th、^(226)Ra和^(40)K的比活度,评价密封时间对测量值的影响。结果密封时... 目的考察密封时间对锆英砂中天然核素比活度测量值的影响。方法分别密封0、1、4、7、11、15、20和30天,采用HPGeγ谱仪测量锆英砂中四种天然核素^(238)U、^(232)Th、^(226)Ra和^(40)K的比活度,评价密封时间对测量值的影响。结果密封时间对锆英砂中^(238)U、^(232)Th和^(40)K的测量值基本无影响,对^(226)Ra的影响小于2%。结论对锆英砂的天然核素分析可以即刻进行,不必密封等待。 展开更多
关键词 密封时间 天然核素 锆英砂 HPGEΓ谱仪
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Valency Increasing in South Ethio-Semitic
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作者 Tsige Yohannes Zeleke 《宏观语言学》 2022年第1期111-131,共21页
The present paper focuses on a descriptive method of valency-increasing devices in five South Ethio-Semitic languages(Amharic,Harari,Kɨstane,Məsqan,and Endəgaɲ).The five languages were selected for two reasons.The fir... The present paper focuses on a descriptive method of valency-increasing devices in five South Ethio-Semitic languages(Amharic,Harari,Kɨstane,Məsqan,and Endəgaɲ).The five languages were selected for two reasons.The first reason is that conducting a valency study on all South Ethio-Semitic languages would have been impossible.With limited resources and time,it will prove difficult to cover all languages.The second reason is that,except for Amharic,these languages are known for being the least studied.Most of them even lack sufficient recording and description.So this research needs to choose the representative language in each branch.As a result,no explicit theoretical framework is followed;data analysis is guided solely by a descriptive perspective.The study’s data was gathered by consulting native speakers via elicitation.Valency has been considered as both a semantic and syntactic notion.As a semantic notion,it is used to refer to the participants in an event;as a syntactic notion,it is used to indicate the number of arguments in a construction.There are different types of transitivity classes of verbs in the South Ethio-Semitic Language,which is spoken in Ethiopia:intransitive,transitive,and ditransitive.Apart from these,there are verbs that can be used both intransitively and transitively.The facts that provide clear evidence for grammatical relations in South Ethio-Semitic languages are crucial to the study of the concept of valency-increasing devices.As is the case in many languages,South Ethio-Semitic languages possess morphosyntactic means through which the valency of verbs can be adjusted.The application of these morphosyntactic processes decreases or increases the valency of verbs.This article looks at valency-increasing devices in Causative and Applicative South Ethio-Semitic languages. 展开更多
关键词 applicative CAUSATIVE INTRANSITIVE sesl TRANSITIVE VALENCY
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汽缸堵盖密封胶的研制
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作者 彭明华 李定夷 葛钰苓 《粘接》 CAS 1994年第3期1-4,17,共5页
本文介绍了汽缸堵盖密封专用胶原料特征,各添加成分对胶液性能的影响以及应用"勃劳兰茨基"方程和粘附功公式,论证密封胶浸润性、粘度、界面能之间的关系,并求得最佳配方。
关键词 汽缸堵盖 密封胶 水溶性 硅酸盐
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小儿静脉留置针封管技术的临床分析 被引量:2
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作者 许桂从 《临床合理用药杂志》 2012年第11期62-63,共2页
目的探讨不同小儿静脉留置针封管技术对穿刺护理的影响。方法将240例患儿随机分为A、B、C、D组各60例,每组再随机分为A1和A2组、B1和B2组、C1和C2组、D1和D2组各30例。A1和A2组分别采用3、5ml生理盐水封管;B1和B2组分别采用5ml生理盐水... 目的探讨不同小儿静脉留置针封管技术对穿刺护理的影响。方法将240例患儿随机分为A、B、C、D组各60例,每组再随机分为A1和A2组、B1和B2组、C1和C2组、D1和D2组各30例。A1和A2组分别采用3、5ml生理盐水封管;B1和B2组分别采用5ml生理盐水、5ml肝素液封管;C1和C2组均采用5ml生理盐水,分别以10、5ml/min的推注速度进行封管封管;D1和D2组均采用5ml生理盐水按5ml/min的推注速度封管,D1组推注完毕后直接拔针,D2组剩余1ml封管液时边推注边旋转退封管针头。观察并比较对应组72h内堵管、浅静脉炎和肿胀的发生率,以及留置针保留天数。结果 A2、B2、C2、D2组封管情况分别优于对应的A1、B1、C1、D1组,差异均有统计学意义(P<0.05)。结论采用正确的封管方法,可以延长静脉留置针保留时间,减少穿刺次数,提高护理工作质量。 展开更多
关键词 小儿静脉留置针 封管液 封管方法
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