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Overshoot phenomena:Observation and simulation

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Earth and Planetary Physics 2024年第2期8卷 391-399页

作者： Ting Feng MoRan Liu shimin he Xiang Wang Chen Zhou Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China

High-power O-mode radio waves can excite artificial instabilities in the F region,according to experiments conducted at the European Incoherent Scatter Science Association(EISCAT)heating *** main instabilities include the parametric decay instability(PDI),oscillating two-stream instability(OTSI),and thermal parametric instability(TPI).The PDI and OTSI not only compete with each other,but also compete with the TPI,leading to a two-stage overshoot phenomenon:a miniovershoot occurs on a millisecond time scale after pump-on,followed by the main *** gain insight into the miniovershoot via a generalized Zakharov model,whereas the main overshoot can be observed as an enhanced plasma line overshoot phenomenon in incoherent scatter radar *** can also observe that the zero-frequency ion line exists only in the initial heating period after a cold start and that the upshifted and downshifted ion lines behave irregularly in the *** simulation results show that competition between the PDI and OTSI leads to an initial peak,which we named the *** following processes,namely ion density caviton generation,and collapse and cascade in the development of the PDI,contribute to the miniovershoot phenomenon.

关键词： overshoot parametric decay instability oscillating two-stream instability competition

Chinese herbal dose in ancient and modern times:a comparative study

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Journal of Traditional Chinese Medicine 2013年第2期33卷 268-271页

作者： shimin he School of Pharmacy Shanghai University of Chinese Medicine

OBJECTIVE： Appropriate dose guarantees Chinese herb＇s safety and effectiveness. There are adult dose criteria for Chinese herbs in decoction in the Pharmacopoeia of the People＇s Republic of China （2010 Edition） at present. But Chinese herbs have been frequently used in much higher doses than the dose criteria. This study has been conducted to test the dependability of the dose criteria. METHODS： Twenty Chinese herbs were selected as representatives and their adult doses in decoction in Bei Ji Qian .lin Yao Fang, a famous ancient litera- ture, have been reviewed and compared with those in the Pharmacopoeia of the People＇s Republic of China （2010 Edition）. RESULTS： The adult dose criteria for all these 20 Chinese herbs in the Pharmacopoeia of the People＇s Republic of China （2010 Edition） haven＇t covered those in Bei Ji Qian .fin Yao Fang. Furthermore, maxi- mal adult doses in the dose criteria are much lower than those in Bei Ji Qian Jin Yao Fang. CONCLUSION： The dose criteria in the Pharmaco- poeia of the People＇s Republic of China （2010 Edition） are not comprehensive enough. Studying ancient literatures is an effective method to gain preciousChinese herbs＇ dose data and helps for new dose criteria＇s establishment in the future.

关键词： Bei Ji O.ian Jin Yao Fang Incunabula Pharmacopoeias Traditional Chinese Medicine Dosage

A Clinical and Histopathological Analysis of 45 Cases of Cutaneous Neurilemmoma (Schwannomas)

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Journal of Biosciences and Medicines 2024年第11期12卷 384-396页

作者： shimin he Guangchang Shan Department of Dermatology The Seventh Affiliated Hospital of Sun Yat-Sen University Shenzhen China Department of Pathology The Seventh Affiliated Hospital of Sun Yat-Sen University Shenzhen China

Background: Neurilemmoma (Schwannomas) are the most common peripheral nerve tumors and usually do not undergo malignant transformation, except in some atypical cases. Additionally, the imaging appearance of schwannomas resembles that of neurofibromas, making it difficult to distinguish between the two. Therefore, the clinical diagnosis and treatment of schwannomas may face certain challenges. The management and prognosis of neurilemmomas differ from their malignant counterparts, making correct diagnosis important. Objective: This study evaluates the clinical and histopathological characteristics of 45 cases of neurilemmoma. Methods: This retrospective study involves 45 cases diagnosed with cutaneous neurilemmoma at the Seventh Affiliated Hospital of Sun Yat-sen University between April 2020 and September 2024. All cases were retrieved from medical records. Results: The age range of the 45 patients was 23 to 73 years, with a male to female ratio of 1.6:1. Over half the cases occurred in individuals aged 30 to 59, with most lesions found in the extremities, predominantly in the lower limbs. Disease duration varied from 7 days to 20 years. All tumors were solitary, with diameters ranging from 0.8 cm to 8 cm. Most tumors (33/45, 73.33%) were asymptomatic, though some patients experienced symptoms like pain and numbness. Mass was the most common clinical diagnosis (33/45, 73.33%). Five patients had suspected neurilemmomas prior to surgery. Immunohistochemical staining revealed all positive results for S-100 and SOX-10 markers, while EMA staining showed a negative rate of 93.33%. Most Ki-67 values (19/23, 82.6%) were less than or equal to 5%. Conclusion: The diversity of clinical features, pathological manifestations, and immunohistochemical results of schwannoma poses a challenge to accurate diagnosis. A comprehensive understanding of its clinical and pathological characteristics is essential for accurate diagnosis, and when combined with immunohistochemical analysis, it

关键词： Neurilemmoma Schwannomas Cutaneous Neurilemmoma Clinical Feature Histopathological Characteristics

A Clinical and Histopathological Analysis of 147 Cases of Dermatofibroma (Benign Fibrous Histiocytoma)

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Advances in Bioscience and Biotechnology 2024年第10期15卷 590-601页

作者： shimin he Zhang Wen Department of Dermatology The Seventh Affiliated Hospital of Sun Yat-Sen University Shenzhen China Department of Pathology The Seventh Affiliated Hospital of Sun Yat-Sen University Shenzhen China

Background: Dermatofibroma usually occurs on the extremities or trunk as a common and benign skin tumor. The identification of typical dermatofibroma is uncomplicated, although it can be challenge due to its wide range of presentations and histological variations. Objective: This study was undertaken to evaluate the clinical and histopathological characteristics of 147 Cases of Dermatofibroma. Methods: This is a retrospective study of 147 biopsy specimens of 124 patients who were diagnosed with dermatofibroma in the Department of Dermatology and the Department of Pathology at the Seventh Affiliated Hospital of Sun Yat-sen University between January 2009 and April 2024. All case were retrieved from the saved medical records. Results: Ages of the 124 Dermatofibroma-affected individuals ranged from 11 to 61 years with a male-to-female ratio of 1:1.7. Over 80% of the case occurred between the ages of 20 and 49 years, 61.9% of the lesions were found on the extremities. The duration of the cases varied from 17 days to 30 years and half of lesions (58.2%) persisted for less than two years. Over 60% of the lesions were found on the extremities. The diameter of the tumors ranged between 0.3 cm and 5 cm, with most tumors measuring less than or equal to 2 cm (85.00%). Cutaneous masses or dermatofibroma was the most common clinical diagnosis. Most tumors (79.6%) were asymptomatic. Cutaneous masses or dermatofibroma was the most common clinical diagnosis. Prior to the surgical procedure, 57 cases were suspected to be “DF”, 55 cases were suspected to be “cutaneous masses”. Immunohistochemical staining revealed positive expression of SMA, while the negative rate of CD34 was found to be 66.67%. No diffuse CD34 positivity was observed in all tumors. Conclusion: Variations in clinical features, pathological manifestations, and immunohistochemical results of DF pose challenges for accurate diagnosis. A comprehensive understanding of its clinical and pathological characteristics is cru

关键词： Dermatofibroma Benign Fibrous Histiocytoma Clinical Feature Histopathological Characteristics

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中国武侠电影与中国软实力在新加坡

浙江传媒学院学报 2014年第2期21卷 89-97页

作者： Christabelle he shimin 陶冶新加坡南洋理工大学浙江传媒学院文化创意学院

每个新加坡人都热爱功夫格斗吗?根据卡尔·道格拉斯的研究,在1974年美国的迷恋功夫电影的高峰期时,美国每个人倒确实都热爱"功夫格斗"。许多学者对中国武侠电影在美国社会的影响进行了研究,然而另一些学者则认为,美国电影在其作为一个... 详细信息

每个新加坡人都热爱功夫格斗吗?根据卡尔·道格拉斯的研究,在1974年美国的迷恋功夫电影的高峰期时,美国每个人倒确实都热爱"功夫格斗"。许多学者对中国武侠电影在美国社会的影响进行了研究,然而另一些学者则认为,美国电影在其作为一个超级大国的崛起过程中,扮演着美国的软实力战略的一部分;十分遗憾的是,少有人探讨中国武侠电影在亚洲地区的影响。今天,中国在全球秩序中的崛起已然是不争的事实,而中国电影也已经越来越流行,并且其亦作为"软实力"也进入了中国的官方话语中——正如旨在安抚别国情绪的所谓"和平崛起"。本文旨在从新加坡观众的角度探讨中国武侠片在产生中国传统文化的吸引力和中国电影力量在提升中国软实力方面的潜力。有证据表明,中国的武侠片确实是一种宝贵的软实力资源,同时也是一种可以继续在亚洲推广的很有前途的方式。

关键词：中国武侠电影软实力中国文化新加坡观众

水压对盾构管片衬砌力学特征与破坏形态的影响模型试验研究

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土木工程学报 2018年第4期51卷 111-120页

作者：王士民姚佳兵何祥凡申兴柱西南交通大学交通隧道工程教育部重点实验室四川成都610031

水压力作为一个重要因素,对盾构隧道管片衬砌结构的受力状态及长期安全性具有显著的影响。文中依托广深港客运专线狮子洋盾构隧道工程,采用模型试验的方法,比较分析了0m、30m、60m三种不同水压条件下管片衬砌结构的内力、变形、声发射... 详细信息

水压力作为一个重要因素,对盾构隧道管片衬砌结构的受力状态及长期安全性具有显著的影响。文中依托广深港客运专线狮子洋盾构隧道工程,采用模型试验的方法,比较分析了0m、30m、60m三种不同水压条件下管片衬砌结构的内力、变形、声发射数据及裂纹产生发展等试验数据信息,探讨水压对盾构隧道管片衬砌结构受力状态及破坏特征的影响规律。研究结果表明:在一定范围内,水压的增加,延长了管片衬砌结构的弹性受力阶段及塑性发展平台,延缓了结构内部出现损伤破坏的时间,提高了衬砌结构的极限载能力。随着水压的增加,管片临界失稳点的最大位移与隧道外半径之比由2.33%增大到2.77%,但是由局部损伤破坏出现到管片衬砌结构整体失稳的过程变得更短,发展速度变得更快,管片的主要破坏形式由以受拉破坏为主变为以压剪破坏为主。

关键词：盾构隧道水压力模型试验声发射失稳

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探寻算理,提升运算能力

江苏教育研究 2020年第35期 35-38页

作者：何世民南京市汉口路小学江苏南京210008

真实展现算理形成过程,让学生充分理解算理,会不断提高儿童的运算能力。在实际的运算教学中,教者可以借助一定的物化载体,引导学生领会算理,关注运算过程的探究,重视学生内化感悟。在计算教学课堂上运用四色学习单这一载体,让学生由易... 详细信息

真实展现算理形成过程,让学生充分理解算理,会不断提高儿童的运算能力。在实际的运算教学中,教者可以借助一定的物化载体,引导学生领会算理,关注运算过程的探究,重视学生内化感悟。在计算教学课堂上运用四色学习单这一载体,让学生由易到难、探索算理,进而探究争鸣、发现算理,接着尊重差异、深悟算理,并能运用所掌握的数学原理,解决生活中的实际问题,体会运算所散发的魅力。

关键词：算理运算能力小学数学教学

重庆市北碚区农村饮水安全巩固提升工程建设相关问题探讨

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水资源开发与管理 2017年第12期3卷 56-59页

作者：何世民重庆市北碚区水利局重庆北碚400700

本文针对存在小型供水工程水量水质保障程度不高,管网及附属设施建设不规范,小型供水工程运行管护困难,良性运行机制尚不完善等问题,提出了农村饮水安全巩固提升思路,通过加强供水工程改造与建设、强化水源保护和供水水质保障、健全完... 详细信息

本文针对存在小型供水工程水量水质保障程度不高,管网及附属设施建设不规范,小型供水工程运行管护困难,良性运行机制尚不完善等问题,提出了农村饮水安全巩固提升思路,通过加强供水工程改造与建设、强化水源保护和供水水质保障、健全完善工程良性运行机制和服务保障体制等三大措施,进一步提升农村饮水安全保障程度,巩固农村饮水安全成果。

关键词：农村饮水巩固提升工程建设建议

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大数据视野下民族医药标准现状及对策研究

中华中医药杂志 2023年第11期38卷 5144-5147页

作者：何仕敏曹燕赵敏湖北中医药大学医学人文学院武汉430065 湖北中医药大学卫生健康与中医药法治研究中心武汉430065

中医药标准化是中医药事业发展的基础,是中医药法治建设的重要保障。而民族医药标准是我国中医药标准体系的重要组成部分。文章通过大数据收集分析法对我国民族医药标准现状以及问题进行分析研究,针对问题提出加大标准制定投入、加强民... 详细信息

中医药标准化是中医药事业发展的基础,是中医药法治建设的重要保障。而民族医药标准是我国中医药标准体系的重要组成部分。文章通过大数据收集分析法对我国民族医药标准现状以及问题进行分析研究,针对问题提出加大标准制定投入、加强民族地域间合作、完善人才建设机制等政策性建议。期望推动民族医药标准科学的制定,促进民族医药标准的推广,进一步完善中医药标准体系,加强标准体系建设。

关键词：中医药标准民族医药大数据