检索结果-南通市图书馆

Journal of Literature and Art Studies 2024年第6期14卷 474-490页

作者： BAI Zhao-yi fang yu-xin WEN Jia-hao School of Fine Arts Shanxi UniversityTaiyuanShanxi030006China School of Architecture and Urban Planning Beijing University of Civil Engineering and ArchitectureBeijingChina

Digital technology provides a method of quantitative investigation and data analysis for contemporary landscape spatial analysis,and related research is moving from image recognition to digital algorithmic analysis,providing a more scientific and macroscopic way of *** key to refinement design is to refine the spatial design process and the spatial improvement strategy *** the ancient city of Zhaoyu in Qixian County,Shanxi Province as an example,(1)based on obtaining the integrated data of the ancient city through the drone tilt photography,the style and landscape of the ancient city are modeled;(2)the point cloud data with spatial information is imported into the point cloud analysis platform and the data analysis is carried out from the overall macroscopic style of the ancient city to the refinement level,which results in the formation of a more intuitive landscape design scheme,thus improving the precision and practicability of the landscape design;(3)Based on spatial big data,it starts from the spatial aggregation level,spatial distribution characteristics and other evaluation index system to achieve the refinement analysis of the *** technology and methods are used throughout the process to explore the refined design path.

关键词： digital technology Zhaoyu Ancient City tilt photography point cloud data

Si的添加对Cu-Ni-Al合金显微组织和性能的影响

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材料热处理学报 2024年第4期45卷 48-60页

作者：丁炜程建奕刘领余方新南昌大学物理与材料学院江西南昌330031

Cu-Ni-Al合金作为一种超高强、导电的弹性铜合金,在电子工业、航空航天、仪器仪表等方面应用广泛。利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)和扫描透射电镜(STEM)对Cu-6Ni-2.76Al和Cu-6Ni-2.76Al-0.4Si合金时效后的显微组... 详细信息

Cu-Ni-Al合金作为一种超高强、导电的弹性铜合金,在电子工业、航空航天、仪器仪表等方面应用广泛。利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)和扫描透射电镜(STEM)对Cu-6Ni-2.76Al和Cu-6Ni-2.76Al-0.4Si合金时效后的显微组织进行了研究。结果表明:Cu-6Ni-2.76Al合金在经过900℃×12 h均匀化退火+80%热轧变形+950℃×2 h固溶+50%冷轧变形+500℃×8 h时效处理后的综合性能较好,硬度为279.5 HV0.3,导电率为16.14%IACS,合金的强化相为纳米级球状颗粒γ′-Ni3Al相;Cu-6Ni-2.76Al-0.4Si合金在经过900℃×12 h均匀化退火+80%热轧变形+950℃×2 h固溶+50%冷轧变形+450℃×2 h时效处理后的综合性能优异,硬度为313.2 HV0.3,导电率为13.24%IACS,合金的强化相为纳米级颗粒γ′-Ni3Al相和δ-Ni2Si相。Si元素的添加对合金的导电率影响不大,但显著地提高了其峰值硬度,且缩短了达到硬度峰值所需要的时效时间,但也使得合金抗过时效能力下降。γ′-Ni3Al和δ-Ni2Si强化相与Cu基体的位向关系分别为:[001]_(Cu)∥[001]_(Ni_(3)Al)∥[001]_(δ);(110)_(Cu)∥(110)_(Ni_(3)Al)∥(100)_(δ);(110)_(Cu)∥(110)_(Ni_(3)Al)∥(010)_(δ)。沉淀强化作用对合金性能的提升最显著。

关键词： Cu-Ni-Al合金时效处理导电率硬度沉淀强化

浅析《中华人民共和国食品安全法》的修订历程与思考

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中国食物与营养 2024年第4期30卷 27-33页

作者：房昕瑜郭晓晖中国农业大学食品科学与营养工程学院北京100083

目的:对我国《中华人民共和国食品安全法》自颁布后的3次修订细节进行概述,对比分析我国与多个发达国家食品安全、食品卫生法律体系的异同。为国家食品安全法律保障工作提供相关参考建议。方法:通过关键词检索并筛选相关文献、书籍及网... 详细信息

目的:对我国《中华人民共和国食品安全法》自颁布后的3次修订细节进行概述,对比分析我国与多个发达国家食品安全、食品卫生法律体系的异同。为国家食品安全法律保障工作提供相关参考建议。方法:通过关键词检索并筛选相关文献、书籍及网络资料进行综述。结果:《中华人民共和国食品安全法》的修订给食品产业各利益相关方带来重要启示,与中国现阶段食品安全现状、未来食品发展趋势和国民营养与健康关系密切。结论:我国需加强食品安全法律法规的宣传工作,提高执法能力,加强社会舆论的监督管理,切实保障食品安全。

关键词：食品安全食品安全法法律修订食品监管社会共治

S1脑区CXCL1/CXCR2参与针刺改善佐剂性关节炎大鼠炎性痛的作用机制

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针刺研究 2024年第4期49卷 331-340页

作者：李艳伟窦报敏王慎军吕中茜李威徐枝芳刘阳阳徐媛房钰鑫郭永明郭义天津中医药大学实验针灸学研究中心天津301617

目的:探究大脑初级体感皮层(S1)脑区趋化因子CXC配体1(CXCL1)及趋化因子CXC受体2(CXCR2)参与针刺镇痛的作用机制,进一步揭示针刺镇痛的神经-免疫学机制。方法:将热痛阈值相对稳定的BALB/c小鼠足底注射0.05 mL完全弗氏佐剂(CFA)建立佐剂... 详细信息

目的:探究大脑初级体感皮层(S1)脑区趋化因子CXC配体1(CXCL1)及趋化因子CXC受体2(CXCR2)参与针刺镇痛的作用机制,进一步揭示针刺镇痛的神经-免疫学机制。方法:将热痛阈值相对稳定的BALB/c小鼠足底注射0.05 mL完全弗氏佐剂(CFA)建立佐剂性关节炎(AIA)模型后,随机分为单纯荧光组和荧光标记CXCL1组,每组2只。荧光标记CXCL1组小鼠尾静脉注射AF750荧光标记CXCL1重组蛋白,并通过小动物活体成像技术,观察荧光及荧光标记CXCL1在AIA小鼠体内的主要富集脏器及脑的荧光富集情况。另取热痛阈值相对稳定的Wistar大鼠,右足底注射0.1 mL CFA建立AIA模型,随机分为模型组、针刺组,每组12只,取12只Wistar大鼠右足底注射等体积的0.9%氯化钠溶液作为盐水组。针刺组大鼠针刺“足三里”1次/d,针刺持续7 d,治疗结束后采用热痛仪测量大鼠右侧足底热缩足潜伏期即热痛阈值;利用ELISA、免疫荧光及实时荧光定量PCR技术,检测文献报道的可能表达CXCR2及阿片肽受体的多个疼痛相关脑区CXCL1蛋白含量及S1脑区CXCL1阳性细胞数与mRNA表达水平,以期探明前期研究结果中针刺后升高的血清CXCL1的作用脑区;采用ELISA法检测各组大鼠S1脑区中CXCR2蛋白含量,采用实时荧光定量PCR法检测S1脑区中CXCR2、μ-阿片肽受体(MOR)的mRNA表达,采用免疫荧光双标法将CXCR2分别与星形胶质细胞标记物胶质纤维酸性蛋白(GFAP)、神经元标记物NeuN及MOR共染,检测CXCR2在S1脑区中的表达细胞及是否与MOR共表达。结果:与单纯荧光组相比,荧光标记CXCL1组小鼠脑组织中有较强的荧光信号。与盐水组相比,模型组大鼠右侧足底热痛阈值均明显降低(P<0.01),S1脑区中CXCR2 mRNA表达升高(P<0.05);与模型组相比,针刺组第2~7天热痛阈值、S1脑区中CXCL1蛋白含量、CXCR2蛋白含量及mRNA表达、MOR mRNA表达均升高(P<0.05,P<0.01);针刺组大鼠S1脑区中CXCR2分别与NeuN及MOR有共染,表明CXCR2存在于神经元和MOR阳性神经元中,而不存在于GFAP阳性星形胶质细胞中。结论:针刺改善AIA大鼠炎性痛的作用机制可能与其上调S1脑区中CXCL1蛋白含量及S1脑区神经元上的CXCR2、促进神经元表达MOR有关。

关键词：针刺镇痛佐剂性关节炎炎性痛 CXC配体1/CXC受体2 大脑初级体感皮层区(S1) 阿片肽受体

不同封装结构SiC MOSFET的开关振荡分析

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电力电子技术 2024年第5期58卷 138-140页

作者：欧宏李伟邦方玉鑫花清源南瑞集团有限公司(国网电力科学研究院有限公司) 江苏南京211106 南京南瑞半导体有限公司江苏南京211100

此处分析了不同封装结构碳化硅金属-氧化物半导体场效应晶体管(SiC MOSFET)在开关过程中振荡的产生原因和影响因素。首先建立简化电路模型,准确计算出开关稳态后电压振荡的时域表达式,该电路模型考虑了器件的相关性能参数、器件和电路... 详细信息

此处分析了不同封装结构碳化硅金属-氧化物半导体场效应晶体管(SiC MOSFET)在开关过程中振荡的产生原因和影响因素。首先建立简化电路模型,准确计算出开关稳态后电压振荡的时域表达式,该电路模型考虑了器件的相关性能参数、器件和电路中的寄生参数。其次通过Matlab软件对模型中的时域表达式进行波形拟合。最后搭建了双脉冲测试平台,实验验证了模型的精确性,也具体量化了不同参数对开关振荡的影响。

关键词：晶体管开关振荡寄生参数电路模型

Current Tracking on Effectiveness and Mechanisms of Acupuncture Therapy: A Literature Review of High-Quality Studies

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Chinese Journal of Integrative Medicine 2020年第4期26卷 310-320页

作者： YANG Fu-ming YAO Lin WANG Shen-jun GUO Yi XU Zhi-fang ZHANG Chien-Hung ZHANG Kuo fang yu-xin LIU Yang-yang Acupuncture Research Center Tianjin University of Traditional Chinese MedicineTianjin(301617)China Department of Acu-moxibustion and Tuina Changchun University of Traditional Chinese MedicineJilin(130000)China Department of Acu-moxibustion and Tuina Tianjin University of Traditional Chinese MedicineTianjin(301617)China Department of Traditional Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin(301617)China

The scientific evidenee of acupuncture studies has been improved in recent years,and one of the important manifestations is that more and more acupuncture clinical trials and mechanism researches have been published in the source periodicals of Science Citation Index(SCI).This study summarized the dominant diseases of acupuncture focusing on of acupuncture efficacy and mechanisms,and discussed the existing problems,highlight!ng the directi on of future developme *** clinical studies were published in journals with journal impact factor(JIF)score of 10 or above,and majority of the basic researches had JIF scores of 5 to *** above literature were further divided according to the International Classification of Diseases(ICD).The most concerned diseases in these articles were neurological diseases,musculoskeletal system and connective tissue diseases,tumor and digestive system *** therapeutic effect and mechanism of acupuncture on each kind of disease were *** results showed that the therapeutic effect of acupuncture on nerve injury focused on the anti-oxidation pathway,neuroprotective and anti-inflammatory *** antiinflammatory effect also played an important role in the treatme nt of musculoskeletal *** an algesic effect was underlined in most of these *** trials were well carried out on acupuncture curative effect of tumor complications and side effects of chemo-radiotherapy,but the potential mechanisms have not been ***-visceral reflex was suggested to be strongly associated with the effects of acupuncture changing the motor activity of the gastrointestinal *** magnetic resonance imaging studies indicated that non-specific effects play important roles in acupuncture *** of evidenee have pointed out that the regulation of neuro-endocrine-immune networks may be a common switch of acupuncture on different nerve system diseases.

关键词： acupuncture clinical trials mechanism anti-inflammation neuro-endocrine-immune network

Salvage radical prostatectomy for radiorecurrent prostate cancer： the Chinese experience

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Chinese Medical Journal 2013年第23期126卷 4592-4593页

作者： GAO Xu WANG Hai-feng fang Zi-yu LU xin LI Yao-ming WANG Yan SUN Ying-hao Department of Urology Changhai Hospital Second Military University Shanghai 200433 China

For localized prostate cancer, radiation therapy （RT） is commonly used. However, in the first five years of RT, 10%-20% of localized prostate cancer patients, ano 30%-50% of the locally advanced prostate cancer patients will progress to biochemical recurrence. In the past, only few these patients considered salvage radical prostatectomy （SRP） as their primary selection due to the significant morbidity.

关键词： radiorecurrent prostate cancer salvage radical prostatectomy biochemical recurrence

A low-frequency and broadband wave-insulating vibration isolator based on plate-shaped metastructures

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Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1171-1188页

作者： Wei WEI Feng GUAN xin fang College of Intelligent Science National University of Defense TechnologyChangsha410073China Naval Research Academy Beijing100161China

A metamaterial vibration isolator,termed as wave-insulating isolator,is proposed,which preserves enough load-bearing capability and offers ultra-low and broad bandgaps for greatly enhanced wave *** consists of plate-shaped metacells,whose symmetric and antisymmetric local resonant modes offer several low and broad mode bandgaps although the complete bandgap remains high and *** bandgap mechanisms,vibration isolation properties,effects of key parameters,and robustness to complex conditions are *** experimentally demonstrated,the wave-insulating isolator can improve the vibration insulation in the ranges of[50 Hz,180 Hz]and[260 Hz,400 Hz]by 15 dB and 25 dB,respectively,in contrast to the conventional isolator with the same first resonant frequency.

关键词： metamaterial and metastructure vibration isolation bandgap wave insulation plate

Helmholtz decomposition with a scalar Poisson equation in elastic anisotropic media

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Petroleum Science 2024年第3期21卷 1597-1610页

作者： xin-yu fang Gang Yao Qing-Qing Zheng Ping-Min Zhang Di Wu Feng-Lin Niu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Beijing102249China Department of Mathematics College of ScienceChina University of Petroleum(Beijing)Beijing102249China College of Geophysics China University of Petroleum(Beijing)Beijing102249China Department of Earth Environmental and Planetary SciencesRice UniversityHoustonTX77005UA

P-and S-wave separation plays an important role in elastic reverse-time *** can reduce the artifacts caused by crosstalk between different modes and improve image *** addition,P-and Swave separation can also be used to better understand and distinguish wave types in complex *** present,the methods for separating wave modes in anisotropic media mainly include spatial nonstationary filtering,low-rank approximation,and vector Poisson *** of these methods require multiple Fourier transforms or the calculation of large matrices,which require high computational costs for problems with large *** this paper,an efficient method is proposed to separate the wave mode for anisotropic media by using a scalar anisotropic Poisson operator in the spatial *** 2D problems,the computational complexity required by this method is 1/2 of the methods based on solving a vector Poisson ***,compared with existing methods based on pseudoHelmholtz decomposition operators,this method can significantly reduce the computational *** examples also show that the P and S waves decomposed by this method not only have the correct amplitude and phase relative to the input wavefield but also can reduce the computational complexity significantly.

关键词： Anisotropic media Scalar anisotropic Poisson equation Improved elastic wavefield decomposition

Control of Virtual Synchronous Generator for Frequency Regulation Using a Coordinated Self-adaptive Method

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 175-184页

作者： Hongwei fang Zhiwei yu School of Electrical and Information Engineering and Key Laboratory of Tianjin Electric Power System Simulation and Control Tianjin UniversityTianjin 300072China

Power inverter adopting virtual synchronous generator(VSG)control can provide inertia support for distributed generation ***,it cannot take into account the dynamic regulation characteristics of ***,when the system encounters a sudden change in load or disturbance,the dynamic process of frequency regulation will be greatly *** view of this issue,an improved VSG control strategy based on a coordinated self-adaptive(CSA)method is *** time domain analysis method is used to study the influences of virtual inertia and damping parameter perturbation on the system steady and dynamic ***,in order to make the control strategy suitable for large load changes and suppress frequency variations beyond the limit,the secondary frequency modulation is introduced into the control *** the coordinated adaptive control of virtual inertia,virtual damping and frequency modulation,the dynamic performance of vSG frequency regulation can be obviously *** and experiment results have verified the effectiveness of the proposed CSA control strategy.

关键词： Coordinated self-adaptive method frequency regulation time domain analysis virtual synchronous generator