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从“数的概念”看贵州水族数学文化的挖掘及其教育价值

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凯里学院学报 2014年第6期32卷 5-9页

作者：严虹吕传汉项昭贵州师范大学数学与计算机科学学院贵州贵阳550001 北京师范大学数学科学学院北京100875

贵州水族有着丰富的非物质文化遗产,在其语言文字、天文历法、民间文学中都蕴含了丰富的数学文化.以"数的概念"为视角,在水族非物质文化遗产中进行挖掘与整理,进而应用于水族地区的数学教学,对于水族地区数学课程资源开发有着一定的实... 详细信息

贵州水族有着丰富的非物质文化遗产,在其语言文字、天文历法、民间文学中都蕴含了丰富的数学文化.以"数的概念"为视角,在水族非物质文化遗产中进行挖掘与整理,进而应用于水族地区的数学教学,对于水族地区数学课程资源开发有着一定的实践价值.

关键词：贵州水族数学文化教育价值数的概念

Investigation of the Effects of Cavitation Number on Motion Characteristics of Supercavitating Vehicle

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Investigation of the Effects of Cavitation Number on Motion ...

Leakage current characteristics and ageing assessment technology of roof arrester under ultra harmonics overvoltage

第36届中国控制会议

作者： XIONG Tian-hong lv Yi-ping YI Wen-Jun National Key Laboratory of Transient Physics Nanjing University of Science and Technology

ISBN: (纸本)9781538629185

Supercavitating vehicle in high speed is covered by supercavity substantially or wholly. The collision between fin of vehicle and supercavity always results in the generation of nonlinear planning force, which brings vibration and shock. To ensure stable movement of underwater supercavitating vehicle, the effects of cavitation number on the motion characteristics of a supercavitating vehicle are analyzed based on dynamic simulation tools such as numerical simulation, phase track diagram and Lyapunov exponent spectra and so on. Results demonstrated that the motion of supercavitating vehicle has nonlinear dynamic *** cavitation number varies, some physical phenomena such as Hopf bifurcation, periodic bifurcation, and chaos occured. Moreover, vibration and shock can be effectively suppressed by adjusting fin’s control law, then a stable movement of the supercavitating vehicle can be achieved.

关键词： Supercavitating Vehicle Cavitation Number Nonlinear Dynamics Bifurcation Theory

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High Voltage 2022年第2期7卷 346-356页

作者： Jixing Sun Fan Ding Yunlong lv Jiayi Ren Sibo Song Tiance Li Qingyun Zhi Changwang Guo School of Electrical Engineering Beijing Jiaotong UniversityBeijingChina TianJin EMU&Railway Vehicles Depot China Railway Beijing Group Co.Ltd.TianjinChina

The large leakage current of the roof arrester caused by the high‐frequency resonant overvoltage on the high‐speed train occurs intermittently,which will cause the arrester to overheat *** this work,the overheating issue of the arrester under Ultra Harmonics Overvoltage is ***,the relationship between the active power and the voltage(including amplitude and frequency)of the arrester is investigated,and the impact mechanism of the harmonic voltage on the overheating fault of the arrester is analysed based on experiments in this *** is found that the total leakage current of the arrester is proportional to the amplitude and frequency of the applied *** internal resistance of the arrester is independent of the amplitude of the voltage,but it will decrease with the increase of the *** main reason that leads to thermal breakdown of the arrester valve under high‐frequency harmonic voltage is the heating power elevation of the arrester *** research study can provide theoretical basis and data support for the design,type selection and monitoring of the high‐speed train roof arrester.

关键词： harmonics harmonic characteristics

Conversion therapy in liver transplantation for hepatocellular carcinoma:What's new in the era of molecular and immune therapy?

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Hepatobiliary & Pancreatic Diseases International 2023年第1期22卷 7-13页

作者： Chao Jiang Xiao-Dong Sun Wei Qiu Yu-Guo Chen Da-Wei Sun Guo-Yue lv General Surgery Center Department of Hepatobiliary and Pancreatic Surgerythe First Hospital of Jilin UniversityChangchun 130021China

Background:Hepatocellular carcinoma(HCC)is the sixth most common cancer globally,with limited therapies and unsatisfactory prognosis once in the advanced *** promising advances in locoregional and systematic treatments,fast development of targeted drugs,the success of immunotherapy,as well as the emergence of the therapeutic alliance,conversion therapy has recently become more well developed and an effective therapeutic *** article aimed to review recent developments in conversion therapy in liver transplantation(LT)for *** sources:We searched for relevant publications on Pub Med before September 2022,using the terms“HCC”,“liver transplantation”,“downstaging”,“bridging treatment”and“conversion therapy.”Results:Conversion therapy was frequently represented as a combination of multiple treatment modalities to downstage HCC and make patients eligible for *** combining various local and systematic treatments in conversion therapy is still controversial,growing evidence has suggested that multimodal combined treatment strategies downstage HCC in a shorter time,which ultimately increases the opportunities for ***,the recent breakthrough of immunotherapy and targeted therapy for HCC also benefit patients with advanced-stage ***:In the era of targeted therapy and immunotherapy,applying the thinking of transplant oncology to benefit HCC patients receiving LT is a new topic that has shed light on advanced-stage *** the expansion of conversion therapy concepts,further investigation and research is required to realize the full potential of conversion treatment strategies,including accurately selecting candidates,determining the timing of surgery,improving the conversion rate,and guaranteeing the safety and long-term efficacy of treatment.

关键词： Liver transplantation Hepatocellular carcinoma Conversion therapy Targeted therapy Immunotherapy Combination therapy

Establishment and Preliminary Application of a Rapid Fluorescent Focus Inhibition Test (RFFIT) for Rabies Virus

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Virologica Sinica 2013年第4期28卷 223-227页

作者： Pengcheng Yu Xinjun lv Xinxin Shen Qing Tang Guodong Liang Key Laboratory of Medical Virology and Viral Diseases Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention

The World Health Organization (WHO) standard assay for determining levels of the rabies virus neutralization antibody (RVNA) is the rapid fluorescent focus inhibition test (RFFIT), which is used to evaluate the immunity effect after vaccination against rabies. For RFFIT, CVS-11 was used as the challenge virus, BSR cells as the adapted cells, and WHO rabies immunoglobulin (WHO STD) as the reference serum in this study. With reference to WHO and Pasteur RFFIT procedures, a micro-RFFIT procedure adapted to our laboratory was produced, and its specificity and reproducibility were tested. We tested levels of RVNA in human serum samples after immunization with different human rabies vaccines (domestic purified Vero cell rabies vaccine (PVRV) and imported purified chick embryo cell vaccine (PCECV)) using different regimens (Zagreb regimen and Essen regimen). We analyzed the levels of RVNA, and compared the immune efficacy of domestic PVRV and imported PCECV using different immunization regimens. The results showed that the immune efficacy of domestic PVRV using the Zagreb regimen was as good as that of the imported PCECV, but virus antibodies were generated more rapidly with the Zagreb regimen than with the Essen regimen. The RFFIT procedure established in our laboratory will enhance the comprehensive detection ability of institutions involved in rabies surveillance in China.

关键词： Rapid fluorescent focus inhibition test (RFFIT) RVNA Rabies Vaccination regimen

A novel static shape-adjustment technique for planar phased-array satellite antennas

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Acta Mechanica Sinica 2018年第6期34卷 1145-1155页

作者： Ji-Yang Zhou Guang-Yu Lu Guo-Ping Cai Guang-Qiang Fang Liang-Liang lv Jun-Wei Shi Department of Engineering Mechanics State Key Laboratory of Ocean EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Aerospace System Engineering Shanghai 201109China

Planar phased-array satellite antennas deform when subjected to external disturbances such as thermal gradients or slewing *** distortion can degrade the coherence of the antenna and must therefore be eliminated to maintain *** support planar phased-array satellite antennas,a truss with diagonal cables is often applied,generally pretensioned to improve the stiffness of the antenna and maintain the integrity of the structure.A new technique is proposed herein,using the diagonal cables as the actuators for static shape adjustment of the planar phased-array satellite *** this technique,the diagonal cables are not pretensioned;instead,they are slack when the deformation of the antenna is *** using this technique,there is no need to add redundant control devices,improving the reliability and reducing the mass of the *** finite element method is used to establish a structural model for the satellite antenna,then a method is introduced to select proper diagonal cables and determine the corresponding *** simulations of a simplified two-bay satellite antenna are first carried out to validate the proposed ***,a simplified 18-bay antenna is also studied,because spaceborne satellite antennas have inevitably tended to be large in recent *** numerical simulation results show that the proposed technique can be effectively used to adjust the static shape of planar phased-array satellite antennas,achieving high precision.

关键词： Planar phased-array satellite antenna Static shape adjustment Diagonal cables Active control

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杜惠兰教授治疗异位妊娠验案举隅

河北中医药学报 2024年第2期39卷 50-53页

作者：周真真蒋敏吕竞芳杜惠兰河北中医药大学研究生学院石家庄050091 河北省中西医结合生殖疾病协同创新中心/河北省中西医结合肝肾病证研究重点实验室石家庄050091

文章总结杜惠兰教授治疗未破损型异位妊娠的经验。杜教授根据多年临床经验提出中医药治疗未破损型异位妊娠的优势,认为异位妊娠的病位在胞络,基本病机是冲任不畅,少腹血瘀,病机关键在“血瘀”,强调“血瘀”贯穿于异位妊娠始终;临床上予... 详细信息

文章总结杜惠兰教授治疗未破损型异位妊娠的经验。杜教授根据多年临床经验提出中医药治疗未破损型异位妊娠的优势,认为异位妊娠的病位在胞络,基本病机是冲任不畅,少腹血瘀,病机关键在“血瘀”,强调“血瘀”贯穿于异位妊娠始终;临床上予辨证施治,以活血祛瘀、消癥杀胚、祛瘀扶正分期治疗,取得了显著疗效。本文从病因病机、治则治法方面探讨杜教授治疗异位妊娠的学术观点和临床经验。

关键词：异位妊娠血瘀癥瘕杜惠兰胎阻胞络证

浅谈变电站综合自动化系统运维工作需要注意的几个问题

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仪器仪表用户 2024年第4期31卷 20-22页

作者：吕占彪曲全方李晶邓显俊许继电气股份有限公司河南许昌461000

变电站是我国重要的电能转换结构,主要负责将原始电能的电压进行升高或降低处理,以满足社会各方的用电需求伴随着科技的飞速发展,综合自动化系统被越来越广泛的应用到变电站中,并且发挥了非常重要的作用。同时,变电站是电力输送的重要环... 详细信息

变电站是我国重要的电能转换结构,主要负责将原始电能的电压进行升高或降低处理,以满足社会各方的用电需求伴随着科技的飞速发展,综合自动化系统被越来越广泛的应用到变电站中,并且发挥了非常重要的作用。同时,变电站是电力输送的重要环节,其运行稳定和安全至关重要。为了提高供电效率和可靠性,近年来越来越多地采用变电站综合自动化系统技术进行改造。因此,本文重点研究变电站综合自动化系统运维工作需要注意的几个问题,以保证变电站正常运转并及时发现故障。

关键词：变电站综合自动化系统运维工作注意事项

3D-DSA与Dyna-CT在颅内支架置入术中的临床应用研究

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中国CT和MRI杂志 2024年第1期22卷 28-30页

作者：周新华陈良义翁磊华吕绍茂厦门大学附属中山医院影像科、厦门市放射质量控制中心福建厦门361004 厦门大学附属中山医院神经内科福建厦门361004

目的探讨三维DSA血管成像(3D-DSA)及数字平板造影机的C臂旋转并断层重建技术(DynaCT)在颅内支架置入术患者中的临床应用。方法选择2019年1月-2020年6月厦门大学附属中山医院收治92例颅内动脉狭窄患者,所有患者均行颅内支架置入术治疗,... 详细信息

目的探讨三维DSA血管成像(3D-DSA)及数字平板造影机的C臂旋转并断层重建技术(DynaCT)在颅内支架置入术患者中的临床应用。方法选择2019年1月-2020年6月厦门大学附属中山医院收治92例颅内动脉狭窄患者,所有患者均行颅内支架置入术治疗,分为对照组(n=38例)和观察组(n=54例)。对照组采用3D-DSA引导,观察组采用DynaCT引导,术后进行12个月门诊随访,比较两组改良Rankin量表(mRS)评分、手术成功率、并发症、支架再狭窄及斑块检出率。结果观察组术后4个月、8个月及12个月mRS评分、支架成形术耗时低于对照组(P0.05);观察组手术后进行12个月门诊随访,患者支架再狭窄、血管狭窄部位斑块检出率低于对照组(P<0.05)。结论DynaCT用于颅内支架置入术中能改善患者症状,缩短支架成形术耗时,有助于提高手术成功率,未增加并发症发生率,能降低血管狭窄部位斑块检出率,值得推广应用。

关键词：三维DSA血管成像数字平板造影 C臂旋转并断层重建技术颅内支架置入术