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一种实用的可除颤节律识别算法

中国医疗设备 2019年第1期34卷 25-29页

作者：洪俊标蒋浩宇何先梁叶文宇孙泽辉深圳迈瑞生物医疗电子股份有限公司广东深圳518057

根据可除颤节律的特点,一种基于多特征参数联合判断的可除颤节律自动识别算法被提出。首先,对心电信号进行预处理;然后分别计算信号的峰值斜率、幅度概率密度、波峰幅度均方差、波形复杂度和心率参数;再对这些特征参数进行综合决策,从... 详细信息

根据可除颤节律的特点,一种基于多特征参数联合判断的可除颤节律自动识别算法被提出。首先,对心电信号进行预处理;然后分别计算信号的峰值斜率、幅度概率密度、波峰幅度均方差、波形复杂度和心率参数;再对这些特征参数进行综合决策,从而实现可除颤节律的自动识别。采用公共标准数据库(CU、AHA、MIT-BIH、VFDB、NST)和迈瑞公司临床数据库对算法进行评测,评测结果表明该算法灵敏度和特异度都达到了较高水平,充分满足临床应用的安全有效性要求。

关键词：可除颤节律识别多特征参数自动体外除颤仪室颤

Methane emission via sediment and water interface in the Bohai Sea,China

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Journal of Environmental Sciences 2022年第4期34卷 465-474页

作者： Kunpeng Zang Gen Zhang Xuemei Xu Nan Zheng haoyu Xiong Haixiang Hong Kai jiang Miao Liang College of Environment Zhejiang University of TechnologyHangzhou 310014China State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological SciencesBeijing 100081China Key Laboratory for Ecological Environment in Coastal Areas National Marine Environmental Monitoring CenterDalian 116023China Meteorological Observation Center China Meteorological AdministrationBeijing 100081China

Sediment is recognized as the largest reservoir and source of methane(CH_(4))in the ocean,especially in the shallow coastal *** date,few data of CH_(4)concentration in sediment have been reported in the China shelf *** this study,we measured CH_(4)concentration in sediment and overlying seawater columns,and conducted an incubation experiment in the Bohai Sea in May ***_(4)concentration was found to be ranged from 3.075 to 1.795μmol/L in sediment,which was 2 to 3 orders of magnitude higher than that in overlying seawater *** surface sediment was an important source of CH_(4),while bottom seawater acted as its ***,the net emission rate via sediment water interface(SWI)was calculated as 2.45μmol/(m^(2)·day)based on the incubation experiment at station73,and the earthquake may enhance CH_(4)release from sediment to seawater column in the eastern Bohai Sea.

关键词： Methane Porewater Sediment-water interface Rhizon sampler Earthquake

β-细辛醚通过抑制TRPV4的表达缓解谷氨酸诱导的Ca^(2+)超载

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合肥工业大学学报（自然科学版） 2024年第2期47卷 263-269页

作者：蒋兰兰陈向涛储涛蔡静雯刘浩宇尹兰香安徽医科大学药学院安徽合肥230022 中国科学技术大学附属第一医院(安徽省立医院)药剂科安徽合肥230001

谷氨酸处理会导致Ca^(2+)超载,瞬时受体电位香草素受体4(transient receptor potential vanilloid 4,TRPV4)在其中的作用及可能机制尚不清楚。β-细辛醚能快速透过血脑屏障,对兴奋性毒性具有较强的神经保护作用。文章以高分化的PC12细... 详细信息

谷氨酸处理会导致Ca^(2+)超载,瞬时受体电位香草素受体4(transient receptor potential vanilloid 4,TRPV4)在其中的作用及可能机制尚不清楚。β-细辛醚能快速透过血脑屏障,对兴奋性毒性具有较强的神经保护作用。文章以高分化的PC12细胞为研究对象,探究β-细辛醚(15、30、60μmol/L)预处理4 h,40 mmol/L谷氨酸处理实时记录对PC12细胞Ca^(2+)浓度的影响,采用钙成像技术检测Ca^(2+)浓度的变化;采用实时荧光定量聚合酶链式反应(polymerase chain reaction,PCR)、Western Blot及免疫荧光技术检测TRPV4的mRNA和蛋白的表达;采用Lipofectiamine 2000脂质体实验转染TRPV4-siRNA和pEX-3-TRPV4,观察沉默和过表达TRPV4对谷氨酸引起Ca^(2+)超载的影响。结果表明:与正常对照组相比,谷氨酸处理5 min可诱导Ca^(2+)超载,显著提高TRPV4的mRNA和蛋白的表达;与模型组相比,β-细辛醚能够剂量依赖性地降低谷氨酸诱导的Ca^(2+)超载和TRPV4的表达;沉默TRPV4抑制细胞Ca^(2+)超载;过表达TRPV4则部分逆转β-细辛醚抑制谷氨酸诱导的Ca^(2+)超载。该研究证明,谷氨酸处理PC12细胞5 min通过上调TRPV4的表达诱导Ca^(2+)超载,β-细辛醚作为TRPV4的拮抗剂,是一种潜在的抑制兴奋性毒性的药物。

关键词：谷氨酸兴奋性毒性 β-细辛醚瞬时受体电位香草素受体4(TRPV4) Ca^(2+)超载

Pressure sensing recognition of FBG array based on random forest algorithm

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Optoelectronics Letters 2023年第5期19卷 262-268页

作者： WANG Yan ZHU Wei GE Ziyang WANG Junliang XU haoyu jiang Chao School of Electrical and Information Engineering Anhui University of TechnologyMaanshan 243000China

In order to improve the precision of static load pressure recognition and identify the position of the applied force accurately,a fiber Bragg grating(FBG)flexible sensor array is proposed in this *** analysis for the package thickness(4 mm)and package position(2 mm from the bottom)of the FBG flexible sensor is performed using COMSOL,and optimal package thickness(4 mm)and package position(2 mm from the bottom)are selected in the *** using 12-FBGs layout method and random forest algorithm,the position and load prediction model is *** results show that the average error of the distance between the prediction points of coordinates X-Y and static load F and the real sample points is ***,to verify the proposed models,the pressure sensing experiments of the flexible FBG array are carried out on this *** weights of 100 g to 1000 g are applied to different regions of the flexible sensor array one by one in accordance with a certain *** variation of each FBG wavelength was taken as the input of the stochastic forest prediction model,and the coordinate position and the static load size F were taken as the output to establish the prediction *** minimum distance error between the actual point and the predicted point was calculated by experiment as *** maximum is 0.2481,and the mean error is *** is concluded that the random forest prediction model has a good prediction effect on the pressure sensing of the flexible FBG sensing array.

关键词： prediction random algorithm

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辉钼矿氧压水浸氧化规律及其动力学研究

湿法冶金 2024年第1期43卷 47-52,66页

作者：姜丽帅蔺月萌韩百岁李潇煜徐文涛谢昊宇辽宁科技大学矿业工程学院辽宁鞍山101145

研究了采用氧压水浸法浸出辉钼矿中的钼,考察了矿石粒级、氧分压、温度、搅拌速度对辉钼矿氧化的影响,探讨了氧化产物在固、液两相中的分配规律。结果表明:矿石粒度的减小,以及氧分压、温度、搅拌速度的提高均可促进辉钼矿氧化;氧化产... 详细信息

研究了采用氧压水浸法浸出辉钼矿中的钼,考察了矿石粒级、氧分压、温度、搅拌速度对辉钼矿氧化的影响,探讨了氧化产物在固、液两相中的分配规律。结果表明:矿石粒度的减小,以及氧分压、温度、搅拌速度的提高均可促进辉钼矿氧化;氧化产物首先进入液相,当液相中MoO_(4)^(2-)达到饱和后,氧化产物会以MoO_(3)形式进入渣相;辉钼矿氧压水浸过程中钼的氧化过程可用未反应核收缩模型描述,反应速率受混合控制模型控制,表观活化能为40.55 kJ/mol。

关键词：辉钼矿氧压钼氧化水浸动力学规律

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改性沥青混合料动态模量的多影响因素分析

西安工业大学学报 2024年第4期44卷 471-480页

作者：王昊宇姜欣野刘涛牛帅张骞棋四川久马高速公路有限责任公司成都610000 长安大学特殊地区公路工程教育部重点实验室西安710064

为探明多因素作用下沥青混合料力学性能,采用UTM-25万能试验机测定添加3种外加剂(橡维联、抗车辙剂和PR-Module(PR.M))的混合料动态模量,研究其与外加剂、温度和频率的作用规律。结果表明:3种外加剂均可有效提升混合料力学性能,橡维联... 详细信息

为探明多因素作用下沥青混合料力学性能,采用UTM-25万能试验机测定添加3种外加剂(橡维联、抗车辙剂和PR-Module(PR.M))的混合料动态模量,研究其与外加剂、温度和频率的作用规律。结果表明:3种外加剂均可有效提升混合料力学性能,橡维联体现在改善其粘弹特性,抗车辙剂和PR.M表现于调节其内部嵌挤作用。5种沥青混合料的抗变形能力均随温度升高或频率降低而下降,但同时掺加橡维联和抗车辙剂可有效缓解其衰减趋势。较基质沥青混合料,频率变化对改性沥青混合料的影响程度更大,说明其弹性更强,抵抗高温变形的能力更优。温度升高导致不同沥青混合料相位角相异,且混合料承受荷载的主要因素改变,由低温时粘结力为主,过渡到高温时内部嵌挤作用为主。

关键词：改性沥青混合料动态模量相位角外加剂影响因素

Fabrication of 3D ordered needle-like polyaniline@hollow carbon nanofibers composites for flexible supercapacitors

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Chinese Chemical Letters 2021年第8期32卷 2448-2452页

作者： Xuepeng Ni Yang jiang haoyu Chen Kunming Li Huifang Chen Qilin Wu Anqi Ju College of Materials Science and Engineering&State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Zhejiang Provincial Key Laboratory of Yarn Material Forming and Composite Processing Technology Jiaxing UniversityShanghai 201620China Key Laboratory of High-Performance Fibers&Products Ministry of EducationDonghua UniversityJiaxing 314001China

Carbon nanofiber-based supercapacitors have broad prospects in powering wearable electronics owing to their high specific capacity,fast charge/discharge process,along with long-cycling ***,a poly(ac rylo n it rile-co-β-methyl hydrogen itaconate) copolymer was prepared and used to synthesize flexible hollow carbon nanofibers(HCNFs) via an electrospinning method without breaking after multiple ***,the inner and outer surfaces of HCNFs were evenly covered with ordered needlelike polyaniline(PANI) through in-situ polymerization methods to obtain three-dimensional flexible HCNFs/PANI composites,which exhibited a high capacity 1196.7 F/g at 1 A/g and good cycling stability(90.1% retention at 5 A/g after 3000 cycles).The symmetrical supercapacitor based on the HCNFs/PANI composites also delive red an outsta nding electrochemical performance with high energy/power density(60.28 Wh/kg at 1000 W/kg) and superior cycling durability(90% capacitance retention after at 5 A/g3000 cycles),which confirmed that the HCNFs/PANI composites had a wide application potential in flexible energy storage devices.

关键词： Flexible Polyaniline Electrospinning Hollow carbon nanofibers Supercapacitors

原位TiB_(2)颗粒对AlSi10Mg合金组织和力学性能的影响

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特种铸造及有色合金 2024年第5期44卷 663-668页

作者：赵浩宇江鸿翔李世欣赵九洲张丽丽何杰中国科学技术大学稀土学院赣州341119 中国科学院赣江创新研究院赣州341000 中国科学院金属研究所沈阳110016 中国科学技术大学材料科学与工程学院沈阳110016

Al-Si合金由于具有优异的可铸造性、耐腐蚀性和良好的力学性能,在航空航天和交通运输等领域得到了广泛的应用。近年来,科技的不断发展对Al-Si合金的耐热性能也提出了更高的要求。研究了原位TiB_(2)颗粒对Al-Si系合金组织以及室温和高温... 详细信息

Al-Si合金由于具有优异的可铸造性、耐腐蚀性和良好的力学性能,在航空航天和交通运输等领域得到了广泛的应用。近年来,科技的不断发展对Al-Si合金的耐热性能也提出了更高的要求。研究了原位TiB_(2)颗粒对Al-Si系合金组织以及室温和高温性能的影响。结果表明,原位TiB_(2)颗粒的引入不仅能作为α-Al的异质形核质点、细化基体晶粒,而且能抑制共晶Si的生长、变质共晶Si。此外,合金的抗拉强度、屈服强度和弹性模量均随TiB_(2)颗粒含量的增加而不断增大。添加10%的TiB_(2)颗粒后,室温条件下(24℃)合金的抗拉强度、屈服强度和弹性模量分别由155 MPa、103 MPa和75.2 GPa增加到206 MPa、133 MPa和89.3 GPa;200℃条件下合金的抗拉强度、屈服强度和弹性模量分别由112 MPa、70 MPa和68.5 GPa增加到137 MPa、89 MPa和81.2 GPa。

关键词：铝合金原位TiB_(2)颗粒力学性能弹性模量

Measurements of differential and angle-integrated cross sections for the 10B（n, α）7Li reaction in the neutron energy range from 1.0 eV to 2.5 MeV

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Chinese Physics C 2019年第12期43卷 47-74页

作者： haoyu jiang Wei jiang Huaiyong Bai Zengqi Cui Guohui Zhang Ruirui Fan HanYi Changjun Ning Liang Zhou Jingyu Tang Qi An Jie Bao Yu Bao Ping Cao Haolei Chen Qiping Chen Yonghao Chen Yukai Chen Zhen Chen Changqing Feng Keqing Gao Minhao Gu Changcai Han Zijie Han Guozhu He Yongcheng He Yang Hong Hanxiong Huang Weiling Huang Xiru Huang Xiaolu Ji Xuyang Ji Zhijie jiang Hantao Jing Ling Kang Mingtao Kang Bo Li Chao Li Jiawen Li Lun Li Qiang Li Xiao Li Yang Li Rong Liu Shubin Liu Xingyan Liu Guangyuan Luan Qili Mu Binbin Qi Jie Ren Zhizhou Ren Xichao Ruan Zhaohui Song Yingpeng Song Hong Sun Kang Sun Xiaoyang Sun Zhijia Sun Zhixin Tan Hongqing Tang Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Qi Wang Taofeng Wang Zhaohui Wang Jie Wen Zhongwei Wen Qingbiao Wu Xiaoguang Wu Xuan Wu Likun Xie Yiwei Yang Li Yu Tao Yu Yongji Yu Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Yubin Zhao Luping Zhou Zuying Zhou Danyang Zhu Kejun Zhu Peng Zhu State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Department of Modem Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Northwest Institute of Nuclear Technology Xi'an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China School of Physics Beihang UniversityBeijing 100083China

Differential and angle-integrated cross sections for the 10B(n,α)^7 Li,10B(n,α0)^7 Li and 10B(n,α1)^7 Li^*reactions have been measured at CSNS Back-n white neutron *** enriched(90%)10B samples 5.0 cm in diameter and^85.0μg/cm^2 in thickness each with an aluminum backing were prepared,and back-to-back mounted at the sample *** charged particles were detected using the silicon-detector array of the Light-charged Particle Detector Array(LPDA)*** neutron energy En was determined by TOF(time-of-flight)method,and the valid a events were extracted from the En-Amplitude two-dimensional *** 15 silicon detectors,the differential cross sections of a-particles were measured from 19.2°to 160.8°.Fitted with the Legendre polynomial series,the(n,a)cross sections were obtained through *** absolute cross sections were normalized using the standard cross sections of the 10B(n,α)^7 Li reaction in the 0.3-0.5 MeV neutron energy *** measurement neutron energy range for the 10B(n,α)^7 Li reaction is 1.0 eV≤En<2.5 Me V(67 energy points),and that for the 10B(n,α0)^7 Li and10B(n,α1)^7 Li^*reactions is 1.0 eV≤En<1.0 MeV(59 energy points).The present results have been analyzed by the resonance reaction mechanism and the level structure of the 11B compound system,and compared with existing measurements and evaluations.

关键词： 10B(n,α)^7Li reaction cross sections LPDA CSNS Back-n white neutron source