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产时电子胎心监护分类及处理

中国实用妇科与产科杂志 2024年第2期40卷 138-142页

作者：郭晓辉石苇暨南大学第二临床医学院、深圳市人民医院产科广东深圳518020

电子胎心监护又称之为心分娩力描迹法(cardiotocography,CTG),产时通过三分类评估胎儿宫内状态,对降低新生儿窒息、抽搐等神经系统损伤发生意义重大。Ⅱ类胎心监护图形发生率最高,反映胎儿氧合异常,但产程中产妇使用药物、体位、情绪、... 详细信息

电子胎心监护又称之为心分娩力描迹法(cardiotocography,CTG),产时通过三分类评估胎儿宫内状态,对降低新生儿窒息、抽搐等神经系统损伤发生意义重大。Ⅱ类胎心监护图形发生率最高,反映胎儿氧合异常,但产程中产妇使用药物、体位、情绪、疼痛也会导致Ⅱ类胎心监护图形发生,一些影响因素是可逆的,而另一些则需要尽快分娩。临床决策时应充分考虑临床情况,全面评估,以避免过度干预。

关键词：产时监护心分娩力描迹法酸中毒宫内缺氧

Stepped-up development of accelerator mass spectrometry method for the detection of ^(60)Fe with the HI-13 tandem accelerator

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Nuclear Science and Techniques 2024年第4期35卷 136-143页

作者： yang Zhang Sheng-Quan yan Ming He Qing-Zhang Zhao Wen-hui Zhang Chao-Xin Kan Jian-Ming Zhou Kang-Ning Li xiao-Fei Wang Jian-Cheng Liu Zhao-Hua Peng Zhuo Liang Ai-Ling Li Jian Zheng Qi-Wen Fan Yun-Ju Li You-Bao Wang Zhi-Hong Li yang-Ping Shen Ding Nan Wei Nan Yu-Qiang Zhang Jia-Ying-Hao Li Jun-Wen Tian Jiang-Lin Hou Chang-Xin guo Zhi-Cheng Zhang Ming-Hao Zhu Yu-Wen Chen Yu-Chen Jiang Tao Tian Jin-Long Ma Yi-hui Liu Jing-Yu Dong Run-Long Liu Mei-Yue-Nan Ma Yong-Shou Chen Wei-Ping Liu Bing guo China Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China College of Science Southern University of Science and TechnologyShenzhen 518055China School of Physics Xi’an Jiaotong UniversityXi’an 710049China

The Moon provides a unique environment for investigating nearby astrophysical events such as *** samples retain valuable information from these events,via detectable long-lived“fingerprint”radionuclides such as^(60)*** this work,we stepped up the development of an accelerator mass spectrometry(AMS)method for detecting^(60)Fe using the HI-13tandem accelerator at the China Institute of Atomic Energy(CIAE).Since interferences could not be sufficiently removed solely with the existing magnetic systems of the tandem accelerator and the following Q3D magnetic spectrograph,a Wien filter with a maximum voltage of±60 kV and a maximum magnetic field of 0.3 T was installed after the accelerator magnetic systems to lower the detection background for the low abundance nuclide^(60)Fe.A 1μm thick Si_(3)N_(4) foil was installed in front of the Q3D as an energy *** particle detection,a multi-anode gas ionization chamber was mounted at the center of the focal plane of the ***,an^(60)Fe sample with an abundance of 1.125×10^(-10)was used to test the new AMS *** results indicate that^(60)Fe can be clearly distinguished from the isobar^(60)*** sensitivity was assessed to be better than 4.3×10^(-14)based on blank sample measurements lasting 5.8 h,and the sensitivity could,in principle,be expected to be approximately 2.5×10^(-15)when the data were accumulated for 100 h,which is feasible for future lunar sample measurements because the main contaminants were sufficiently separated.

关键词： Accelerator mass spectrometry Wien filter Isobar separation Supernovae Chang'e-5 lunar samples

Qualitative exploration of home life experiences and care needs among elderly patients with temporary intestinal stomas

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World Journal of Gastroenterology 2024年第22期30卷 2893-2901页

作者： Si-Meng Wang Jian-Ling Jiang Rui Li Juan-Juan Wang Chun-Hong Gu Jia Zeng xiao-hui Wei Mei Chen Wuxi Medical College of Jiangnan University Jiangnan UniversityWuxi 214122Jiangsu ProvinceChina Department of Gastrointestinal Surgery Tongren Hospital Shanghai Jiao Tong University School of MedicineShanghai 200335China Department of Nursing Tong Ren Hospital Shanghai Jiao Tong University School of MedicineShanghai 200335China

BACKGROUND This study employed a phenomenological research approach within qualitative research to explore the challenges encountered by elderly individuals with temporary colostomies in managing their daily lives and care *** the anus surgery combined with temporary colostomy has emerged as a prevalent treatment modality for low rectal ***,the ileostomy is susceptible to peri-stoma skin complications,as well as fluid,electrolyte,and nutritional imbalances,posing challenges to effective *** successful selfmanagement of patients is intricately linked to their adjustment to temporary colostomy;nonetheless,there remains a dearth of research examining the factors influencing self-care among temporary colostomy patients and the obstacles they *** To investigate the lived experiences,perceptions,and care requirements of temporary colostomy patients within their home environment,with the ultimate goal of formulating a standardized management *** Over the period of June to August 2023,a purposive sampling technique was utilized to select 12 patients with temporary intestinal stomas from a tertiary hospital in Shanghai,*** a phenomenological research approach,a semi-structured interview guide was developed,and qualitative interviews were conducted using in-depth interview *** acquired data underwent coding,analysis,organization,and summarization following Colaizzi’s seven-step *** The findings of this study revealed that the experiences and needs of patients with temporary intestinal stomas can be delineated into four principal themes:Firstly,Temporary colostomy patients bear various burdens and concerns about the uncertainty of disease progression;secondly,patients exhibit limited self-care capabilities and face information deficits,resulting in heightened reliance on healthcare professionals;thirdly,patients demonstrate the potential for internal motivation through proactive self-adj

关键词： Elderly Temporary intestinal stomas Life experiences Intestinal ostomy complications Qualitative study

Flashover Probability of Wind Turbine Blade and Impact of Strong Electromagnetic Pulse from Lightning Strikes on Wind Turbine Safety

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Meteorological and Environmental Research 2024年第1期15卷 62-66页

作者： Lixin YAO Bin xiao Jianwen ZHANG Weixiang FENG renhong guo Zengru yanG Chunliang ZHANG hui yanG Hunan Branch of Guangdong Wind Power Generation Co. Ltd.Changsha 410000China CGN New Energy South China Branch Shenzhen 518000China Maoming Meteorological Bureau Maoming 525000China Guangdong Yuedian yangjiang Offshore Wind Power Co. Ltd.Yangjiang 510630China Guangdong Foshan Shunde Lunjiao Jindun Lightning Protection Technology Development Co. Ltd.Foshan 528308China Guangzhou Meteorological Bureau Guangzhou 510530China

This paper systematically studies the flashover probability of wind turbine blade lightning arrester and the impact of strong electromagnetic pulses on the local and surrounding wind turbines during lightning *** research results indicate that the flashover probability of direct lightning strikes by the wind turbine blade lightning arrester is almost negligible,and the strong electromagnetic pulse of wind turbine blade during lightning strikes has a serious impact on the electronic equipment of the machine,while the impact on the surrounding wind turbine is relatively *** the same time,the calculation formula for the reflection of lightning current on the carbon brush between the wind turbine hub and the engine compartment during the flashing of the wind turbine blades is provided,and the calculation method for calculating the spatial gradient distribution of electromagnetic field intensity using Biot-Savart Law theorem is *** limitations of using wind turbine blades for lightning protection are pointed out,and a technical route for achieving wind turbine lightning safety is proposed,which can be used as a reference for wind turbine lightning protection technicians.

关键词： Wind turbine Flashover probability of blade lightning arrester Spatial gradient of electromagnetic field intensity Technical route

In-beam gamma rays of CSNS Back-n characterized by black resonance filter

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NUCLEAR SCIENCE AND TECHNIQUES 2024年第10期35卷 1-12页

作者： Wang, Jin-Cheng ren, Jie Jiang, Wei Ruan, Xi-Chao Liu, Ying-Yi yang, Hao-Lan Xu, Kuo-Zhi Pan, Xin-Yi Sun, Qi Bao, Jie Huang, Han-Xiong Bai, Hao-Fan Bai, Jiang-Bo Cao, Ping Chen, Qi-Ping Chen, Yong-Hao Duan, Wen-Hao Fan, An-Chuan Fan, Rui-Rui Feng, Chang-Qing Gu, Min-Hao Han, Chang-Cai Han, Zi-Jie He, guo-Zhu He, Yong-Cheng Hong, yang Hu, Yi-Wei Jiang, Zhi-Jie Kang, Ling Lan, Chang-Lin Li, Bo Li, Feng Li, Qiang Li, xiao Li, yang Liu, Jie Liu, Rong Liu, Shu-Bin Liu, Yi-Na Luan, Guang-Yuan Ning, Chang-Jun Qiu, Yi-Jia ren, Wen-Kai ren, Zhi-Zhou Song, Zhao-hui Sun, Kang Tan, Zhi-Xin Tang, Jing-Yu Tang, Sheng-Da Wang, Li-Jiao Wang, Peng-Cheng Wang, Zhao-hui Wen, Zhong-Wei Wu, xiao-Guang Wu, Xuan Wu, Ze-Peng Xia, Cong Xie, Li-Kun Yi, Han Yu, Tao Yu, Yong-Ji Zhang, guo-hui Zhang, Hang-Chang Zhang, Qi-Wei Zhang, Xian-Peng Zhang, Yu-Liang Zhang, Zhi-Yong Zhao, Mao-Yuan Zhou, Zhi-Hao Zhu, Ke-Jun Zou, Chong China Inst Atom Energy Key Lab Nucl Data Beijing 102413 Peoples R China Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China Spallat Neutron Source Sci Ctr Dongguan 523803 Peoples R China Chinese Acad Sci Inst High Energy Phys State Key Lab Particle Detect & Elect Beijing 100049 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Peking Univ Sch Phys State Key Lab Nucl Phys & Technol Beijing 100871 Peoples R China Fudan Univ Inst Modern Phys Shanghai 200433 Peoples R China Univ Sci & Technol China State Key Lab Particle Detect & Elect Hefei 230026 Peoples R China Univ Sci & Technol China Sch Nucl Sci & Technol Hefei 230026 Peoples R China Univ Sci & Technol China Dept Modern Phys Hefei 230026 Peoples R China China Acad Engn Phys Inst Nucl Phys & Chem Mianyang 621900 Peoples R China Univ Sci & Technol China USTC Archaeometry Lab Hefei 230026 Peoples R China Northwest Inst Nucl Technol Xian 710024 Peoples R China Lanzhou Univ Sch Nucl Sci & Technol Lanzhou 730000 Peoples R China Univ Sci & Technol China Inst Adv Technol Hefei 230027 Peoples R China

The back-streaming white-neutron beamline (Back-n) of the China Spallation Neutron Source is an essential neutron- research platform built for the study of nuclear data, neutron physics, and neutron applications. Many types of cross-sectional neutron-reaction measurements have been performed at Back-n since early 2018. These measurements have shown that a significant number of gamma rays can be transmitted to the experimental stations of Back-n along with the neutron beam. These gamma rays, commonly referred to as in-beam gamma rays, can induce a non-negligible experimental background in neutron-reaction measurements. Studying the characteristics of in-beam gamma rays is important for understanding the experimental background. However, measuring in-beam gamma rays is challenging because most gamma-ray detectors are sensitive to neutrons; thus, discriminating between neutron-induced signals and those from in-beam gamma rays is difficult. In this study, we propose the use of the black resonance filter method and a CeBr3 scintillation detector to measure the characteristics of the in-beam gamma rays of Back-n. Four types of black resonance filters, Ta-181, Co-59, Ag-nat, and Cd-nat, were used in this measurement. The time-of-flight (TOF) technique was used to select the detector signals remaining in the absorption region of the TOF spectra, which were mainly induced by in-beam gamma rays. The energy distribution and flux of the in-beam gamma rays of Back-n were determined by analyzing the deposited energy spectra of the CeBr3 scintillation detector and using Monte Carlo simulations. Based on the results of this study, the background contributions from in-beam gamma rays in neutron-reaction measurements at Back-n can be reasonably evaluated, which is beneficial for enhancing both the experimental methodology and data analysis.

关键词： In-beam gamma rays Back-n Black filter resonance technique In-beam gamma rays Back-n CeBr3 scintillator Black filter resonance technique C6D6 DETECTOR SYSTEM LINE

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振动能量回收减速带建模与动力学特性研究

机械设计与制造 2024年第1期395卷 100-106页

作者：郭炎何仁廖旭晖徐年尧常州工学院汽车工程学院江苏常州213032 江苏大学汽车与交通工程学院江苏镇江212013

为了开发应用振动能量回收减速带,分析振动能量回收减速带参数与汽车悬架参数的耦合特性机理。首先分析了液压式振动能量回收减速带的工作原理;其次,研究了减速带的动态模型激励函数,并建立二自由度车辆—换能器模型,并从换能器的作用... 详细信息

为了开发应用振动能量回收减速带,分析振动能量回收减速带参数与汽车悬架参数的耦合特性机理。首先分析了液压式振动能量回收减速带的工作原理;其次,研究了减速带的动态模型激励函数,并建立二自由度车辆—换能器模型,并从换能器的作用机理入手,通过复模态理论分析车辆—换能器的振动模型动力学特性;最后,依据振动能量回收减速带与汽车悬架系统的耦合动力学模型,对采用不同参数的振动能量回收减速带对汽车运动特性的影响进行了分析;并从回收能量潜能大小的角度分析了汽车悬架参数对振动能量回收减速带运动特性的影响。为振动能量回收减速带的设计提供了理论参考。

关键词：减速带振动能量回收复模态理论耦合动力学模型动力学特性

Effect analysis of applying high-quality service model to surgical nursing

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World Journal of Clinical Cases 2024年第19期12卷 3744-3751页

作者： Li Chen Qiu-Mei Tu Zhao-Di guo xiao-Wei Zhu Wei Wang hui-Fang Xie Yuan Ye Hand Surgery The First People’s Hospital of Jiangxia DistrictWuhan 430200Hubei ProvinceChina

BACKGROUND Surgical care of the hand plays a crucial role in the medical field,as problems with the hand can profoundly affect a patient's quality of life and *** order to meet the needs of patients,improve patient satisfaction and improve treatment outcomes,high-quality service models have been introduced in the field of *** To explore the effect analysis of applying high-quality service model to surgical *** We conducted a retrospective study of patients who underwent hand surgery at our hospital between 2019 and 2022,using a quality service model that included improved patient education,pain management,care team collaboration,and effective *** group of patients received traditional care as a control *** compared postoperative recovery,satisfaction,complication rate,and length of hospital stay between the two *** statistics were used to compare the difference between the two groups by independent sample t test,Chi-square test and other methods to evaluate the effect of intervention *** Postoperative recovery time decreased from 17.8±2.3 d to 14.5±2.1 d,pain score decreased from 4.7±1.9 to 3.2±1.4,and hand function score increased from 78.4±7.1 to 88.5±*** terms of patient satisfaction,the quality service model group scored 87.3±5.6 points,which was significantly higher than that of the traditional care group(74.6±6.3 points).At the same time,patients'understanding of medical information also improved from 6.9±1.4 to 8.6±*** terms of postoperative complications,the application of the quality service model reduced the incidence of postoperative complications from 26%to 10%,the incidence of infection from 12%to 5%,and the incidence of bleeding from 10%to 3%.The reduction in these data indicates that the quality service model plays a positive role in reducing the risk of *** addition,the average hospital stay of patients in the quality service model group was shortened fr

关键词： Hand surgery nursing Quality service model Clinical outcomes Patient satisfaction Collaboration Pain management

Effects of applied potential on the stress corrosion cracking behavior of 7003 aluminum alloy in acid and alkaline chloride solutions

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International Journal of Minerals,Metallurgy and Materials 2016年第7期23卷 819-826页

作者： xiao-yan Zhang ren-guo Song Bin Sun hai Lu Chao Wang School of Materials Science and Engineering Changzhou University Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University

Potentiodynamic polarization tests and slow strain rate test（SSRT） in combination with fracture morphology observations were conducted to investigate the stress corrosion cracking（SCC） behavior of 7003 aluminum alloy（AA7003） in acid and alkaline chloride solutions under various applied potentials（Ea）. The results show that AA7003 is to a certain extent susceptible to SCC via anodic dissolution（AD） at open-circuit potential（OCP） and is highly susceptible to hydrogen embrittlement（HE） at high negative Ea in the solutions with p H levels of 4 and 11. The susceptibility increases with negative shift in the potential when Ea is less than-1000 m V vs. SCE. However, the susceptibility distinctly decreases because of the inhibition of AD when Ea is equal to-1000 m V vs. SCE. In addition, the SCC susceptibility of AA7003 in the acid chloride solution is higher than that in the alkaline solution at each potential. Moreover, the effect of hydrogen on SCC increases with increasing hydrogen ion concentration.

关键词： aluminum alloys stress corrosion cracking susceptibility hydrogen embrittlement potential acid solutions alkaline solutions

废弃铅锌冶炼场地土壤和地下水重金属迁移及预测

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Journal of Central South University 2024年第4期31卷 1136-1148页

作者：张云霞郭朝晖谢慧民肖细元徐锐 School of Metallurgy and Environment Central South UniversityChangsha 410083China

长期的金属冶炼活动会导致重金属在场地土壤和地下水中的富集和扩散。基于机器学习模型研究了某废弃铅锌冶炼场地土壤中重金属向地下水的迁移规律并进行了含量预测。结果表明,场地土壤重金属主要累积在杂填土和素填土层,并存在垂向迁移... 详细信息

长期的金属冶炼活动会导致重金属在场地土壤和地下水中的富集和扩散。基于机器学习模型研究了某废弃铅锌冶炼场地土壤中重金属向地下水的迁移规律并进行了含量预测。结果表明,场地土壤重金属主要累积在杂填土和素填土层,并存在垂向迁移到地下水的现象。场地土壤中As、Cd和Pb含量平均值均明显超过场地土壤风险筛选值。地下水中Zn、Cd、Pb和As的平均浓度均超过了相应的地下水Ⅵ类限值。土壤重金属污染主要集中在火法冶炼区、湿法冶炼区和原料堆存区。土壤中Cd以活性态为主,Pb以还原态为主。当冶炼场地地下水位低于5 m且土壤Cd含量超过344 mg/kg时,或土壤中活性Pb含量超过5425 mg/kg时,需要对场地土壤和地下水进行协同修复。

关键词：铅锌冶炼场地迁移转化机器学习重金属预测