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双中点、双角平分线模型及其应用
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作者 苏国东 《数学教学通讯》 2024年第5期72-74,共3页
文章阐述双中点模型、双角平分线模型的基本型(和型、差型)和拓展型(有间隙型、有重叠型)的来源、构造、论证、推广及应用,对学生推理能力的提升,数学思想方法的渗透,学生核心素养的发展有重要促进作用.
关键词 几何图形初步 双中点 角平分线 模型 应用
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主题聚焦:中考微专题课型的实践与思考——以“双中点”专题复习课为例
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作者 张赞 《数学教学通讯》 2018年第23期38-39,共2页
考虑到各地中考命题中把关题的命题风格有着浓浓的地区风格,在中考专题复习时针对地区风格研发出微专题,对备考师生来说十分关键.针对某地区中考对"双中点"考题的"喜好",有必要围绕"双中点"考题开设一节专题复习课,这种"主题聚... 考虑到各地中考命题中把关题的命题风格有着浓浓的地区风格,在中考专题复习时针对地区风格研发出微专题,对备考师生来说十分关键.针对某地区中考对"双中点"考题的"喜好",有必要围绕"双中点"考题开设一节专题复习课,这种"主题聚焦"式的中考微专题课型实践与研究,值得关注. 展开更多
关键词 主题聚焦 中考微专题 双中点”考题
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双中点法评估前交叉韧带重建股骨隧道I.D.E.A.L点
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作者 李腾云 付昌马 《皖南医学院学报》 CAS 2024年第5期422-425,共4页
目的:建立一种简单有效的以双中点为参考的股骨隧道位置评估方法。方法:选取2021年8月~2022年12月运用自体肌腱类等长重建前交叉韧带(ACL)损伤患者13例,采用双中点法制备股骨隧道I.D.E.A.L点。纳入患者术前物理查体及磁共振检查均提示AC... 目的:建立一种简单有效的以双中点为参考的股骨隧道位置评估方法。方法:选取2021年8月~2022年12月运用自体肌腱类等长重建前交叉韧带(ACL)损伤患者13例,采用双中点法制备股骨隧道I.D.E.A.L点。纳入患者术前物理查体及磁共振检查均提示ACL断裂。比较手术前后国际膝关节文献委员会(IKDC)评分、Lysholm评分、视觉模拟量表(VAS)评分;同时双中点制备股骨隧道的x/t(%)和y/h(%)数值与术后Bernard网格象限的理想位置x/t(%)和y/h(%)数值进行比较。结果:随访3个月,术后第3个月IKDC、Lyshlom评分均较术前上升(P<0.05),而VAS评分较术前下降(P<0.05)。术后膝关节侧位Bernard网格象限x/t(%)和y/h(%)与理想化位置x/t(%)和y/h(%)数值比较差异无统计学意义(P>0.05)。结论:双中点法是ACL重建评估股骨隧道位置的良好方法,术中关节镜测量与术后Bernard网格象限测量具有良好的一致性。 展开更多
关键词 前交叉韧带 单束重建 股骨隧道 I.D.E.A.L点 双中点 评估
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Banach空间中渐近非扩张映射的广义粘性隐式双中点法则 被引量:2
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作者 王元恒 李参参 《数学学报(中文版)》 CSCD 北大核心 2021年第4期601-612,共12页
本文给出了实Banach空间中,渐近非扩张映射不动点的广义隐式双中点法则的粘性方法.在适当的参数条件下,证明了该算法生成的序列的强收敛定理.本文的结果推广和改进了其他作者的主要结果.
关键词 BANACH空间 渐近非扩张映射 广义粘性隐式双中点法则 强收敛
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Characteristics of small bowel tumors detected by double balloon endoscopy:A Chinese single-center study
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作者 Yulan Liu Weiguo Dong +3 位作者 Jixiang Zhang Liang Zhao Konglin Li Ximing Xu 《The Chinese-German Journal of Clinical Oncology》 CAS 2014年第12期584-588,共5页
Objective: Small intestinal tumors (SBTs) were difficult to be discovered before surgery. The emergence of dou- ble-balloon enteroscopy (DBE) and capsule endoscopy (CE) have greatly improved the evaluation of S... Objective: Small intestinal tumors (SBTs) were difficult to be discovered before surgery. The emergence of dou- ble-balloon enteroscopy (DBE) and capsule endoscopy (CE) have greatly improved the evaluation of SBTs and facilitated a more precise preoperative diagnosis. Yet little data exist in China regarding clinical efficacy of DBE and clinical characteristics of SBTs. The aim of our study was to clarify the clinical characteristics of SBTs and analyze the efficacy of DBE examination in the detection and diagnosis of SBTs. Methods: We retrospectively reviewed patients who underwent DBE in our hospital between June 2011 and July 2014. Patients who were diagnosed with SBTs by DBE were included in the study. Results: A total of 316 patients underwent 321 DBE procedures, 80 (25.3%) of whom were suspected to have an SBT. And 59 of the 80 subjects were diagnosed with SBT finally. The majorities (59.3%, 35/59) of the patients diagnosed with SBT were males, whose average age was 61.8 years (SD _+11.0 years). DBE were frequently performed in patients with obscure gastrointes- tinal bleeding (66.1%), abdominal pain (16.9%). The common SBTs identified were: gastrointestinal stromal tumors (GISTs) (24/59, 40.7%), adenocarcinomas (13/59, 22.0%), lymphomas (6/59, 10.2%) and benign polyps (6/59, 10.2%). Jejunum had the highest detection rate (47.5%, 29/61). During the follow-up period (3 months to 3 years), 14 patients were submitted to chemotherapy and two patients died of tumor. Conclusion: The most high frequency type and location of SBTs detected in our hospital were different from western countries. DBE is a valuable and safe examination for SBIs. 展开更多
关键词 small bowel tumors (SBTs) double-balloon enteroscopy (DBE) capsule endoscopy (CE) clinical characteristics
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聚焦中点问题的一个基本图形 被引量:1
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作者 刘家良 《数理化学习》 2019年第4期42-44,共3页
对角线互相平分的四边形为平行四边形,以此为据提炼出一个"双中点"的基本图形,而这个图形承载的有关结论有助于解答与中点相关的问题.
关键词 双中点 中线加倍 中心对称
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THREE NEW SPECIES OF THE GENUS SPILOGONA (DIPTERA: MUSCIDAE) IN CHINA 被引量:1
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作者 XUEWan-qi TONGYan-feng 《Entomologia Sinica》 CSCD 2003年第2期131-138,共8页
Three new species of the genus Spilogona Schnabl, namely S. carbiarenosa sp. nov., S. dasyoomma sp. nov. and S. kunjirapensis sp. nov. are described from China. The type specimens of S. kunjirapensis sp. nov. are kept... Three new species of the genus Spilogona Schnabl, namely S. carbiarenosa sp. nov., S. dasyoomma sp. nov. and S. kunjirapensis sp. nov. are described from China. The type specimens of S. kunjirapensis sp. nov. are kept in the Institute of Zoology, the Chinese Academy of Sciences, and those of S. carbiarenosa sp. nov. and S. dasyoomma sp. nov. are deposited in Shenyang Normal University. 展开更多
关键词 DIPTERA MUSCIDAE Spilogona new species China
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