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Simplified lung ultrasound method to predict the respiratory support needs of neonates whose mothers had pregnancy complications: a diagnostic accuracy study

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Reproductive and Developmental Medicine 2023年第3期7卷 149-155页

作者： xin-Ao Lin Xue-Feng Wang Xiao-Bo fan Guan-Nan Xi Ji-Mei Wang Department of Neonatology Obstetrics and Gynecology Hospital of Fudan UniversityShanghai 200090China

Objective:Some pregnancy complications are associated with respiratory problems in *** identification and implementation of respiratory support are needed for these *** study aimed to(1)use lung ultrasound(LU)for predicting the respiratory support requirements of infants and(2)simplify the examination method to facilitate its clinical ***:Neonates underwent LU examinations within 1 hour of *** infants were divided into a pregnancy complication(PC)group and a control group according to their mothers'clinical *** primary outcome measure was the need for respiratory *** models were established based on the differences in LU patterns between the two *** predictive value of the models was compared with that of the LU score(LUS)system,which has been widely used in other *** models were established by analyzing the predictive effects of LU patterns in different parts of the *** reliability was tested using the receiver operating characteristic curve ***:PC and control groups had 29 and 117 neonates,respectively;a total of 22 neonates required respiratory *** PC and control groups showed differences in respiratory support requirements,A-lines,and coalesced *** percentages of A-lines and coalesced B-lines were associated with respiratory support *** optimal cutoff values for the percentages of the A-lines and coalesced B-lines were 55.7%and 24.5%,*** effects were obtained by calculating the percentage of coalesced B-lines in four areas(R3,R4,L3,and L4).These methods were judged as more visual and convenient than LUS ***:The percentages of A-line and coalesced B-lines on LU images can be used to predict the respiratory support needs of neonates whose mothers had pregnancy *** four areas(R3,R4,L3,and L4)had similar predictive values.

关键词： Lung ultrasound Respiratory support Pregnancy complications

文心兰不同花期及花朵不同部位香气成分的变化

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中国农业科学 2011年第1期44卷 110-117页

作者：张莹李辛雷王雁田敏范妙华中国林业科学研究院亚热带林业研究所中国林业科学研究院林业研究所

【目的】研究香水文心兰不同花期及花朵不同部位香气成分的变化规律,为了解文心兰香气的形成及释放机理提供参考依据。【方法】采用固相微萃取和气相色谱-质谱联用(GC/MS)技术,分别测定香水文心兰不同花期和花朵不同部位的挥发性香气成... 详细信息

【目的】研究香水文心兰不同花期及花朵不同部位香气成分的变化规律,为了解文心兰香气的形成及释放机理提供参考依据。【方法】采用固相微萃取和气相色谱-质谱联用(GC/MS)技术,分别测定香水文心兰不同花期和花朵不同部位的挥发性香气成分及其相对含量,并对其中的变化进行探讨。【结果】香水文心兰花蕾期的香气组成成分有7种,始花期有22种,盛花期有24种,衰落期有41种;随着花朵的开放,烯、醇和酯类化合物的相对含量总体呈上升趋势,醛酮类和烷烃类化合物的相对含量总体呈下降趋势。在香水文心兰盛花期花朵的3个不同部位中,蕊柱的香气组成成分有97种,花瓣有71种,唇瓣有89种。蕊柱和花瓣中相对含量最高的均是醇类化合物,分别为25.36%和58.16%;唇瓣中烯类化合物的相对含量最高,为49.17%。【结论】从感官分析与GC/MS的测试结果综合判断,烯类物质是影响香水文心兰香气的重要化合物,其中3,7-二甲基-1,3,6-辛三烯、(反)-2-丁烯酸-2-亚甲基环丙基-2-基酯、3,7-二甲基-1,6-辛二烯-3-醇和(顺)-3,7-二甲基-2,6-辛二烯-1-醇是香水文心兰的特征香气化合物,唇瓣可能是香水文心兰花香释放的主要部位。

关键词：香水文心兰花期花朵部位香气成分 GC/MS技术

Co-Fe quantum dots coupled with ultrathin g-C_(3)N_(4) nanosheets as efficient and stable photo-Fenton catalysts

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Rare Metals 2023年第6期42卷 1877-1887页

作者： Jia-Yu Li xin-Yu Wang Jian Tian Xiao-Li Zhang Feng Shi School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

The Fenton reaction has been widely used in the environmental ***,the sharp decline of photo-Fenton catalysts activity under neutral conditions is still an urgent problem to be *** study reports a Co/Fe bimetallic oxide quantum dots-coupled g-C_(3)N_(4)nanosheets(CoFeO QDs/g-C_(3)N_(4) NSs) composites with efficient degradation of organic pollutants under neutral *** the photo-Fenton condition,rhodamine B(RhB) degradation efficiency reached 98.32% within 90min for CoFeO QDs/g-C_(3)N_(4) NSs *** formed heterojunction between CoFeO QDs and g-C_(3)N_(4) NSs achieves enhanced charge transfer and efficient charge ***-Fe bimetals make g-C_(3)N_(4) NSs easier to excite the production of·OH by H_(2)O_(2),achieving excellent degradation efficiency and cycle stability for organic pollutants in a wide pH ***,CoFeO QDs/g-C_(3)N_(4)NSs composites can be used as efficient and stable photoFenton catalysts to degrade organic contaminants in practical applications.

关键词： Bimetallic oxide Quantum dots(QDs) gC_(3)N_(4) Wastewater treatment Photo-Fenton

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基于非参数估计的权证定价方法及应用

系统工程理论与实践 2013年第8期33卷 1916-1925页

作者：樊鹏英陈暮紫蒋勇陈敏中国科学院数学与系统科学研究院北京100190 北京工商大学经济学院北京100048 中央财经大学管理科学与工程学院北京100081 中国科学技术大学统计与金融系合肥230026

针对权证市场,文中首次提出基于非参数估计的权证定价方法,其中包括完全非参数定价方法和基于模型的非参数修正定价方法,并将其应用于中国权证市场和香港权证市场的时间外权证价格预测.实证结果表明:在价值状况非单调情形下,基于模型的... 详细信息

针对权证市场,文中首次提出基于非参数估计的权证定价方法,其中包括完全非参数定价方法和基于模型的非参数修正定价方法,并将其应用于中国权证市场和香港权证市场的时间外权证价格预测.实证结果表明:在价值状况非单调情形下,基于模型的非参数修正定价方法效果最好,完全非参数定价方法次之,半参数定价模型以及参数定价模型效果较差;此外,在时间外的权证价格预报方面,基于模型的非参数修正定价准确性明显优于其他模型.

关键词：权证定价非参数估计价值状况时间内时间外

Tenofovir disoproxil fumarate in Chinese chronic hepatitis B patients:Results of a multicenter,double-blind,double-dummy,clinical trial at 96 weeks

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World Journal of Clinical Cases 2021年第18期9卷 4690-4699页

作者： Xiao-fan Chen Ya-Nan fan Chong-Wen Si Yan-Yan Yu Jia Shang Zu-Jiang Yu Qing Mao Qing Xie Wei Zhao Jun Li Zhi-Liang Gao Shan-ming Wu Hong Tang Jun Cheng xin-Yue Chen Wen-Hong Zhang Hao Wang Zhong-Nan Xu Ling Wang Jun Dai Jing-Hang Xu Department of Infectious Diseases Center for Liver DiseasesPeking University First HospitalBeijing 100034China Department of Infectious Diseases Henan Provincial People's HospitalZhengzhou 450003Henan ProvinceChina Department of Infectious Diseases The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina Department of Infectious Diseases Southwest HospitalThird Military Medical University(Army Medical University)Chongqing 400038China Department of Infectious Diseases Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai 200025China Department of Infectious Diseases The Second Affiliated Hospital of Southeast UniversityNanjing 210011Jiangsu ProvinceChina Department of Infectious Diseases The First Affiliated Hospital with Nanjing Medical UniversityNanjing 210029Jiangsu ProvinceChina Department of Infectious Diseases The Third Affiliated HospitalSun Yat-sen UniversityGuangzhou 510630Guangdong ProvinceChina Department of Infectious Diseases Shanghai Public Health Clinical CenterFudan UniversityShanghai 201052China Department of Infectious Diseases West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina Center of Hepatology Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Department of International Medical Beijing Youan HospitalCapital Medical UniversityBeijing 10069China Department of Infectious Diseases Huashan HospitalFudan UniversityShanghai 200040China Department of Infectious Diseases Peking University People's HospitalBeijing 100044China Clinical Center Jiangsu Chia-tai Tianqing Pharmaceutical Co.LtdNanjing 210000Jiangsu ProvinceChina

BACKGROUND Tenofovir disoproxil fumarate(TDF)is a prodrug of a nucleotide *** an antiviral drug,TDF has been proposed in the first-line treatment of chronic hepatitis B(CHB).Qingzhong,a brand name of TDF,commercialized by Jiangsu Chia-tai Tianqing Pharmaceutical Co Ltd.,and Viread,another brand name of TDF,commercialized by GlaxoSmithKline,have both been approved by the State Food and Drug Administration,*** To investigate the efficacy and safety of the two TDF agents in the treatment of Chinese CHB *** This trial was registered at *** with the identifier number of NCT02287857.A total of 330 Chinese CHB patients,among which 232 were hepatitis B e antigen(HBeAg)-positive,were included in this 5-year-long,multicenter,double-blinded,double-dummy,randomized-controlled,noninferiority phase III *** participants were initially randomized into two groups:Group A(n=161),in which the participants received 300 mg Qingzhong once a day for 48 wk;and Group B,in which the participants received 300 mg Viread once a day for 48 *** from week 49,all the participants in Groups A and B received 300 mg Qingzhong once a day until the 96th *** this study,the primary endpoint was the decrease in plasma level of hepatitis B virus(HBV)DNA at the 96th week,while the secondary endpoints were suppression of HBV replication,alanine aminotransferase(ALT)normalization,HBeAg loss,and HBeAg seroconversion *** For the participants with HBeAg-positive CHB,the decrease in mean HBV DNA level relative to the baseline value was comparable between Groups A and B(5.77 vs 5.73 log10 IU/mL,P>0.05)at the 96th *** addition,similar percentages of HBeAg-positive participants in the two groups exhibited undetectable levels of HBV DNA,HBeAg loss,and HBeAg seroconversion(71.05%vs 77.97%,31.00%vs 27.27%,and 20.22%vs 15.79%,respectively,in Group A vs Group B;P>0.05).For the participants with HBeAg-negative CHB,the decrease in mean HBV DNA level r

关键词： Chronic hepatitis B Hepatitis B virus infection Chronic Tenofovir disoproxil

丝绸之路经济带沿线发展中国家可再生能源政策制定的影响因素

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资源科学 2017年第4期39卷 641-650页

作者：李凡许昕刘姿含北京第二外国语学院国际商学院北京100024 上海财经大学国际工商管理学院上海200433

探索发展中国家可再生能源政策制定影响因素对中国与丝绸之路经济带沿线国家开展更为务实的可再生能源领域国际合作具有重要战略意义。选取丝绸之路经济带沿线32个发展中国家2000-2015年间176条可再生能源政策,基于国内和国外两个视角,... 详细信息

探索发展中国家可再生能源政策制定影响因素对中国与丝绸之路经济带沿线国家开展更为务实的可再生能源领域国际合作具有重要战略意义。选取丝绸之路经济带沿线32个发展中国家2000-2015年间176条可再生能源政策,基于国内和国外两个视角,从6个系统总计选取23个指标,运用面板Logit模型剖析并重点比较四类可再生能源政策制定的影响因素。实证结果显示,一国的经济状况和能源储备状况是丝绸之路经济带沿线发展中国家制定可再生能源政策时的重要影响因素;丝绸之路经济带沿线发展中国家可再生能源政策受到来自垂直系统的国际扩散效应更为显著;不同类型的可再生能源政策受到的国内和国际影响因素不同,其中能源目标政策的制定主要受到国内系统的影响;框架政策和金融税收政策的制定主要受到国内因素和国际垂直扩散系统因素的影响;公共投资政策则受到了国内因素和国际水平、垂直扩散系统因素的综合影响。

关键词：影响因素发展中国家政策制定可再生能源政策丝绸之路经济带

黄芪甲苷对人成纤维细胞光老化的抑制作用(英文)

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中西医结合学报 2011年第3期9卷 328-332页

作者：刘昕闵玮江苏省省级机关医院皮肤科江苏南京210024 苏州大学附属第一医院皮肤科江苏苏州215006

目的:观察黄芪甲苷对长波紫外线(ultraviolet A,UVA)辐射导致的人成纤维细胞衰老的抑制作用,以及对基质金属蛋白酶-1(matrix metalloproteinase-1,MMP-1)和金属蛋白酶组织抑制因子-1(tissue inhibitor of metalloproteinase-1,TIMP-1)等老化相关基因表达的影响。方法:分离培养人原代成纤维细胞,将亚融合状态的培养细胞分为空白对照组、黄芪甲苷组、UVA组和UVA+黄芪甲苷组,以10J/cm2UVA进行照射,并加入20μg/mL黄芪甲苷干预处理。采用组织化学染色法检测衰老相关β半乳糖苷酶表达,以酶联免疫吸附法检测上清液中转化生长因子-β1(transforming growth factor-β1,TGF-β1)的含量,实时聚合酶链反应法检测MMP-1和TIMP-1的mRNA表达水平变化。结果:空白对照组及黄芪甲苷组β半乳糖苷酶阳性细胞均较低,UVA组β半乳糖苷酶阳性细胞数则显著升高,加入黄芪甲苷处理可使β半乳糖苷酶阳性细胞比率明显降低(P<0.05)。黄芪甲苷处理可以促进成纤维细胞分泌TGF-β1;UVA照射成纤维细胞后TGF-β1分泌量明显降低,UVA照射前加入黄芪甲苷可增加TGF-β1分泌量(P<0.05)。此外,UVA能够诱导MMP-1和TIMP-1的mRNA表达水平升高,而黄芪甲苷可在一定程度上抑制MMP-1mRNA表达,并诱导TIMP-1mRNA表达(P<0.05)。结论:黄芪甲苷可有效延缓人成纤维细胞光老化进程,其机制可能与促进TGF分泌和抑制胶原降解相关。

关键词：紫外线成纤维细胞黄芪甲苷转化生长因子-β1 基质金属蛋白酶-1 金属蛋白酶-1组织抑制剂

Preparation of two-dimensional molybdenum disulfide for NO2 detection at room temperature

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Chinese Chemical Letters 2020年第8期31卷 2099-2102页

作者： xin Yu Ding Wang Yuqiu Wang Ji Yan Xianying Wang College of Materials Science and Engineering University of Shanghai for Science&TechnologyShanghai 200093China School of Material and Chemical Engineering Zhengzhou University of Light IndustryZhengzhou 450002China

In this work,the two-dimensional MoS2 film was prepared by sulfuring the molybdenum atomic layer on SiO2/Si *** reaction temperature,heating rate,holding time and carrier gas flow rate were inve stigated compre *** quality of MoS2 film was characterized by optical microscopy,atomic fo rce microscopy,Raman and photoluminescence spectro *** characte rization results showed that the optimum synthesis parameters were heating rate of 25℃/min,reaction temperature of 750℃,holding time of 30 min and carrier gas velocity of 100 *** MoS2 gas sensor was fabricated and its gas sensing performance was *** test results indicated that the sensor had a good response to both reducing gas(NH3)and oxidizing gas(NO2)at room *** sensitivity to 100 ppm of NO2 was 31.3%,and the response/recovery times were 4 s and 5 s,*** addition,the limit of detection could be as low as 1 *** work helps us to develop low power and integrable room temperature NO2 sensors.

关键词： MoS2 film NO2 detection Two-dimensional materials Gas sensors Nanodevices Room temperature detection

基于可见近红外光谱分析技术的马铃薯品种鉴别方法

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光谱学与光谱分析 2016年第8期36卷 2474-2478页

作者：陈争光李鑫范学佳黑龙江八一农垦大学信息技术学院黑龙江大庆163319

基于可见-近红外光谱分析技术,提出了一种快速鉴别马铃薯品种的方法。以三种不同品种共计352个样本的马铃薯作为主要研究对象,随机将其分为建模集(307个样本)和预测集(45个样本)。对其中的建模集样品进行可见-近红外光谱分析,将获取的... 详细信息

基于可见-近红外光谱分析技术,提出了一种快速鉴别马铃薯品种的方法。以三种不同品种共计352个样本的马铃薯作为主要研究对象,随机将其分为建模集(307个样本)和预测集(45个样本)。对其中的建模集样品进行可见-近红外光谱分析,将获取的光谱图像通过多元散射校正(MSC)和窗口大小为9的Savitzky-Golay(S-G)一阶卷积求导方法预处理,消除颗粒大小、表面散射及光程变化对漫反射光谱影响,降低原始光谱曲线的随机噪声影响。然后用偏最小二乘法(PLS)对数据进行降维、压缩,使用主成分分析方法(PCA)获得的前4个主成分累计贡献率达到96%以上,并从前4个主成分图谱中提取20个吸收峰作为输入变量,经过试验,得到一个20(输入)-12(隐含)-3(输出)结构的3层BP神经网络。最后利用该模型对预测集样本进行品种鉴别,识别正确率达到100%。此方法能较为快速、准确地鉴别马铃薯的品种,为马铃薯品质检测与鉴别提供了新思路。

关键词：可见-近红外光谱马铃薯 BP神经网络偏最小二乘品种鉴别