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Assessment of first-order-moment-based sample reconstruction method for design flood estimation in changing environment

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Water Science and Engineering 2023年第3期16卷 226-233页

作者： Yi-ming Hu Zhong-min liang Yi-xin Huang Jun Wang Bin-quan Li College of Hydrology and Water Resources Hohai UniversityNanjing 210098China

Estimating the design flood under nonstationary conditions is challenging. In this study, a sample reconstruction approach was developed to transform a nonstationary series into a stationary one in a future time window (FTW). In this approach, the first-order moment (EFTW) of an extreme flood series in the FTW was used, and two possible methods of estimating EFTW values in terms of point values and confidence intervals were developed. Three schemes were proposed to analyze the uncertainty of design flood estimation in terms of sample representativeness, uncertainty from EFTW estimation, and both factors, respectively. To investigate the performance of the sample reconstruction approach, synthesis experiments were designed based on the annual peak series of the Little Sugar Creek in the United States. The results showed that the sample reconstruction approach performed well when the high-order moment of the series did not change significantly in the specified FTW. Otherwise, its performance deteriorated. In addition, the uncertainty of design flood estimation caused by sample representativeness was greater than that caused by EFTW estimation.

关键词： Hydrological frequency analysis Nonstationarity Series reconstruction Uncertainty assessment Changing environment

BOWL-SHAPED POLY(3,4-ETHYLENEDIOXYTHIOPHENE)/γ-Fe_2O_3 COMPOSITES WITH ELECROMAGNETIC FUNCTION

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Chinese Journal of Polymer Science 2013年第3期31卷 503-513页

作者：张志明 Yue Wang Qiong Li liang-min Yu Jadranka Travas-Sejdic Li-juan Zhang Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of China Polymer Electronics Research Centre School of Chemical SciencesThe University of Auckland

In this paper, electromagnetic poly（3,4-ethylenedioxythiophene）/γ-Fe2O3 （PEDOT/γ-Fe2O3 ） micro-bowls, 1-2 gm in diameter, were prepared by a simple environment-friendly process. In this method, the aqueous solution of cetyltrimethylammonium bromide （CTAB） instead of any organic solvent was used. FeC13 acted as a source of FeIII for the formation of γ-Fe2O3 and as an oxidant for the polymerization of 3,4-ethylenedioxythiophene （EDOT）. The bowl-shaped morphology of PEDOT/γ-Fe2O3 composites was strongly influenced by the concentration of CTAB, FeCl2, ammonia solution and the reaction temperature. The saturation magnetization of PEDOT/γ-Fe2O3 micro-bowls increased with the increase of FeC12 concentration and reached 6.20 AmE/kg at the FeCl2 concentration of 0.30 mol/L. The conductivity of the PEDOT/γ-Fe2O3 composites was in the range of 101 S/cm. The electrical and magnetic sources of PEDOT/γ-Fe2O3 micro-bowls were confirmed by SEM-EDX, TEM, XRD and XPS spectra. And the possible formation mechanism of PEDOT//7：Fe203 was proposed.

关键词： Bowl-shape Poly(3,4-ethylenedioxythiophene)/γ-Fe2O3 Electromagnetic.

膈肌浅快呼吸指数联合肺部超声评分对ICU机械通气患者脱机不良结局的预测价值

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国际呼吸杂志 2024年第1期44卷 53-58页

作者：汪飞何瑾黄小勇梁敏朱晓玲自贡市第四人民医院重症医学科自贡643000 自贡市第四人民医院急诊科自贡643000 自贡市第四人民医院超声医学科自贡643000

目的探讨膈肌浅快呼吸指数(D-RSBI)联合肺部超声评分(LUS)用于重症监护病房(ICU)患者机械通气后脱机不良结局的预测价值。方法本研究为病例对照研究。采用非随机抽样的方法选取2020年10月至2022年10月自贡市第四人民医院ICU收治的100例... 详细信息

目的探讨膈肌浅快呼吸指数(D-RSBI)联合肺部超声评分(LUS)用于重症监护病房(ICU)患者机械通气后脱机不良结局的预测价值。方法本研究为病例对照研究。采用非随机抽样的方法选取2020年10月至2022年10月自贡市第四人民医院ICU收治的100例接受机械通气治疗的患者,根据脱机结果分为脱机成功组(63例)和脱机失败组(37例)。收集所有患者入院时性别、年龄、基础病(糖尿病、高血压、高脂血症、慢性阻塞性肺疾病)、心率、平均动脉压,以及机械通气时间、白细胞计数、乳酸和肌酐水平等临床资料,计算浅快呼吸指数(RSBI)和D-RSBI,并进行LUS。通过受试者操作特征曲线分析D-RSBI、RSBI、LUS预测脱机不良结局的价值,采用平行试验进行联合诊断,采用多因素logistic回归分析明确患者脱机不良结局的危险因素,并采用Spearman秩相关分析D-RSBI、LUS与RSBI的相关性。结果2组患者性别、年龄、心率、糖尿病、高血压、高脂血症、慢性阻塞性肺疾病、平均动脉压、机械通气时间、白细胞计数、肌酐和乳酸水平比较差异均无统计学意义(均P>0.05),脱机失败组RSBI、D-RSBI、LUS高于脱机成功组[(56.63±11.18)次·min^(-1)·L^(-1)比(43.58±9.24)次·min^(-1)·L^(-1),(1.86±0.62)次·min^(-1)·mm^(-1)比(1.13±0.36)次·min^(-1)·mm^(-1),(38.63±7.51)分比(26.85±6.29)分;t值分别为6.30、7.46、8.41,均P53.489次·min^(-1)·L^(-1)、D-RSBI>1.429次·min^(-1)·mm^(-1)、LUS>32.683分是脱机失败的独立危险因素。D-RSBI与RSBI呈正相关(r=0.335,P=0.002),LUS与RSBI无相关性(r=0.184,P=0.671)。结论D-RSBI联合LUS可用于预测ICU患者机械通气后脱机不良结局。D-RSBI>1.429次·min^(-1)·mm^(-1)、LUS>32.683分是脱机失败的独立危险因素。

关键词：呼吸,人工重症监护病房膈肌浅快呼吸指数肺部超声评分脱机

SAA、IL-6、C3、C4联合检测对SLE患者的诊断价值

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医学信息 2024年第14期37卷 96-99页

作者：梁敏敏邹光美杨小兰吴声楹吴博文玉林市第一人民医院检验科玉林市第一人民医院风湿免疫科

目的探讨SAA、IL-6、C3、C4与SLE患者的疾病相关性，分析危险因素。方法选取2020年10月-2023年5月在玉林市第一人民医院就诊SLE患者110例，以及同期健康体检者80例作为研究对象，比较两组的SAA、IL-6、C3、C4水平，以及指标检测的诊... 详细信息

目的探讨SAA、IL-6、C3、C4与SLE患者的疾病相关性，分析危险因素。方法选取2020年10月-2023年5月在玉林市第一人民医院就诊SLE患者110例，以及同期健康体检者80例作为研究对象，比较两组的SAA、IL-6、C3、C4水平，以及指标检测的诊断价值。结果与对照组比较，SLE组SAA、IL-6水平均升高，而SLE组C3、C4水平均降低，差异有统计学意义（P<0.05）。ROC曲线分析结果显示，单指标检测时C3的AUC最大（AUC=0.916）；而联合检测时SAA+IL-6的AUC最大（AUC=0.920）。二元Logistic回归分析显示，SAA、IL-6是SLE患者的危险因素，而C3则是SLE患者保护因素。Spearman相关分析显示，SAA与IL-6呈正相关；SAA和IL-6分别与C3、C4呈负相关。结论联合SAA、IL-6、C3、C4检测及综合评估相关性，对SLE的诊疗及预后有重要的参考价值。

关键词：血清淀粉样蛋白A 白介素6 补体系统性红斑狼疮

A Novel Efficient Red Emitting Iridium Complex for Polymer Light Emitting Diodes

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Chinese Physics Letters 2012年第12期29卷 211-214页

作者： HU Zheng-Yong YANG Jian-Kui LUO Jing liang min WANG Jing Science College Hunan Agricultural UniversityChangsha 410128

Photo-physical properties of iridium complexes bis(1-(2',4'-difluorobiphenyl-4-yl)isoquinoline)iridium(Ⅲ)(5-(4-(bis(4-methoxyphenyl)amino)phenyl)picolinic acid)used as phosphorescent dopant in polymer light-emitting devices with a blend of poly(9,9-dioctylfluorene)and 2-tert-butyl-phenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix are *** iridium complex exhibits distinct UV-vis absorption bands around 300-450 nm and intense red photoluminescent emissions peaked at around 618 nm in *** devices display a maximum external quantum efficiency of 4.8%and luminous efficiency of 3.1 cd·A^(-1) at current density of 3.2 mA·cm^(-2) with a dominant red emission peak around 620 nm and a shoulder around 660 *** 100 mA·cm^(-2),the devices still display a maximum external quantum efficiency as high as 3.9%.

关键词： quantum luminous bands

Optimization on crystallization process of the magnetic core lysozyme

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Particuology 2024年第4期87卷 106-113页

作者： Lixia Hou Chunxiao Qu min Su Zhihan liang Qi Hao School of Chemical Engineering Hebei University of TechnologyTianjin300130China

The continuous growth of the biomedical market highlights the significance of improvement in the ef-ficiency of batch production for protein drug ***,we investigated the effect of polymer-modified Fe_(3)O_(4) nanoparticles on lysozyme(Lys)crystallization at different conditions,using function-alized Fe_(3)O_(4) magnetic nanoparticles(Polymer C@Fe_(3)O_(4))as nucleation *** study revealed that the surface charge density of Polymer C@Fe_(3)O_(4) was highest at a modification mass ratio of Fe_(3)O_(4) to Polymer C is 8∶*** ratio facilitates the augmentation of electrostatic interaction and the promotion of *** adding 15%of the PolymerC@Fe_(3)O_(4) prepared from Fe_(3)O_(4) with an average particle size of 150 nm,the magnetic core lysozyme(M-Lys)crystals with an average particle size of 11.08μm,narrow size distribution,and regular morphology were obtained in a yield of 82.42%within 60 min.

关键词： Protein Crystallization Magnetic particle Lysozyme

Multi-user diversity analysis in MISO amplify-and-forward relaying network

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The Journal of China Universities of Posts and Telecommunications 2010年第2期17卷 19-24页

作者： LIU Fang CHENG Jin-xing ZHANG Xin liang min CHEN Shao-hua YANG Da-cheng School of Nuclear Science and Engineering North China Electric Power University Beijing 102206 China School of Information and Communication Engineering Bcijing University of Posts and Telecommunications Beijing 100876 China No.8 Qinghe Building Beijing 100085 China

This article analyzed multi-user diversity performance for multiple input single output （MISO） amplify-and-forward （AF） relaying network with selection combiner, and the closed-form outage probabilities for variable gain relaying and fixed gain relaying network are derived. Based on these results, diversity order is presented for variable gain relaying network. Simulation results validate the derived theoretical results, and the diversity order of variable gain relaying network with Nr available relays is K （Nt ＋ Nr） in K users＇ scenario, where Nt is the number of source transmitter antennas.

关键词： multi-user diversity amplify-and-forward MISO

Surfactant-assisted crystallization of lysozyme and its mechanism

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Particuology 2024年第7期90卷 199-208页

作者： Yujie Song Rongfei Ren min Su Zhihan liang Qi Hao School of Chemical Engineering Hebei University of TechnologyTianjin 300130China

Surfactants were used to assist in the crystallization of *** types of surfactants with different structures(sodium dodecyl sulfate,cetyltrimethylammonium bromide,or betaine hydrochloride[BH])were *** study indicated that three surfactants were all capable of shortening the crystallization induction time of lysozyme,with BH inducing the shortest crystallization induction time(t=1 min)and the largest crystal size(37μm).The molecular interactions among each of the three surfactants aforementioned and lysozyme were also investigated by *** was found that hydrogen bonding dominantly acted between the carboxyl structure of the surfactant BH and the lysozyme,which produced the most favorable conformation for the self-assembly of lysozyme(promote lysozyme orderly aggregation and shorten the crystallization induction time).On this basis,the mechanism of surfactant-promoted lysozyme crystallization was proposed.

关键词： Protein Crystallization Surfactant Lysozyme Molecular interaction Mechanism

Solid-phase Decarburization Kinetics of High-carbon Ferromanganese Powders by Microwave Heating

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Journal of Iron and Steel Research International 2015年第4期22卷 311-316页

作者： Li-na GUO Jin CHEN Jing ZHAO Wan-ming LIN Wen-li SHI min liang College of Materials Science and Engineering Taiyuan University of Technology

Solid-phase decarburization of high-carbon ferromanganese powders （HCFPs） was conducted using calcium carbonate powders （CCPs） as a decarburizer by microwave heating. Solid-phase decarburization kinelSics was investi- gated by isothermal method. The results show that the HCFPs show excellent microwave absorption at a higher av- erage heating rate of 80 ℃/min, while CCPs exhibit poor microwave absorption at a lower heating rate of 5--20 ℃/min; the heating characteristics are in-between when HCFPs and CCPs are mixed. The average heating rates of the mix- ture are 32.14, 31.25, 31.43, and 30.77 ℃/rain when the mixture is heated up to 900, 1000, 1100, and 1200 ℃, respectively. The good microwave absorption property of the mixed material lays the foundation for the solid-phase decarburization of HCFPs containing CCPs. Solid-phase decarburization of HCFPs containing CCPs is a first-order reaction by microwave heating. Apparent activation energy of solid-phase decarburization is 55.07 kJ/mol, which is far less than that of ordinary carbon gasification reaction and that of solid-phase decarburization under the same de- carburization condition by conventional heating. It indicates that microwave heating not only produces thermal effect, but also has non-thermal effect.

关键词： high-carbon ferromanganese powder solid-phase decarburization kinetics microwave heating calcium carbonate powder