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Predictive models of hypertensive disorders in pregnancy based on support vector machine algorithm

TECHNOLOGY AND HEALTH CARE 2020年第S1期28卷 S181-S186页

作者： Yang, lin Sun, Ge Wang, Anran Jiang, Hongqing Zhang, Song Yang, Yimin li, xuwen Hao, Dongmei Xu, Mingzhou Shao, Jing Beijing Univ Technol Coll Life Sci & Bioengn Intelligent Physiol Measurement & Clin Translat Beijing Int Base Sci & Technol Cooperat Beijing 100024 Beijing Peoples R China Chinese Acad Med Sci Inst Med Informat Beijing 100020 Peoples R China Haidian Maternal & Children Hlth Hosp Beijing 100080 Peoples R China Beijing Aerosp ChangFeng Co Ltd Beijing 100071 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

BACKGROUND: The risk factors of hypertensive disorders in pregnancy (HDP) could be summarized into three categories: clinical epidemiological factors, hemodynamic factors and biochemical factors. OBJECTIVE: To establish models for early prediction and intervention of HDP. METHODS: This study used the three types of risk factors and support vector machine (SVM) to establish prediction models of HDP at different gestational weeks. RESULTS: The average accuracy of the model was gradually increased when the pregnancy progressed, especially in the late pregnancy 28-34 weeks and >= 35 weeks, it reached more than 92%. CONCLUSION: Multi-risk factors combined with dynamic gestational weeks' prediction of HDP based on machine learning was superior to static and single-class conventional prediction methods. Multiple continuous tests could be performed from early pregnancy to late pregnancy.

关键词： Support vector machine algorithm machine learning model research

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“哨兵-2”卫星影像及C2RCC算法在太湖冬春季水色分析中的应用

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中国环境监测 2024年第3期40卷 271-282页

作者：李旭文张悦姜晟王甜甜崔嘉宇纪轩禹陈冰魏玉强陈栋江苏省环境监测中心江苏省太湖水质监测中心站江苏南京210019 南京信息工程大学遥感与测绘工程学院江苏南京210044

利用太湖2019—2022年冬春季“哨兵-2”卫星10 m分辨率的MSI影像和SNAP软件C2RCC(Case 2 Regional CoastColour)模块,以适合浑浊、富营养程度较高、光学复杂的“二类水体”的C2X-nets为模式,开展太湖叶绿素a、总悬浮物浓度、透明度等水... 详细信息

利用太湖2019—2022年冬春季“哨兵-2”卫星10 m分辨率的MSI影像和SNAP软件C2RCC(Case 2 Regional CoastColour)模块,以适合浑浊、富营养程度较高、光学复杂的“二类水体”的C2X-nets为模式,开展太湖叶绿素a、总悬浮物浓度、透明度等水色参数反演。结果表明:冬春季太湖各湖区叶绿素a浓度处于较低水平,但4月中旬起有明显抬升;太湖西部沿岸区、南部沿岸区和湖心区总悬浮物浓度较高,表明这些湖区易受风浪影响,造成沉积物再悬浮;太湖东部沿岸区、北部湖湾及东太湖遥感反演的水体清澈度较高,可能与这些湖区冬春季沉水植物菹草的分布有关,菹草生长对水质有较好的净化效果。总体来看,基于C2X-nets模式的C2RCC反演算法从较高分辨率卫星遥感影像中提取的水色信息,能有效反映太湖冬春季水色指标的空间分布特征,可为湖体生态状况及动态变化的长期监测评估提供有价值的参考。

关键词：哨兵-2 遥感 C2RCC算法水色反演太湖

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Magnetic dispersive solid-phase extraction for the determination of three different glycosides in the Kang'ai injection

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MICROCHEMICAL JOURNAL 2019年 146卷 575-581页

作者： li, Peng Ye, Junfeng Zhang, Yue Wang, Ziqi Ren, Sujuan Jin, Yongri li, xuwen Jilin Univ Coll Chem Changchun 130012 Jilin Peoples R China Jilin Univ Hosp 1 Changchun 130012 Jilin Peoples R China

In this work, the content of flavonoid glycosides and astragalosides in a Chinese medicine injection was determined by using the magnetic dispersive solid phase extraction method coupled with high performance liquid chromatography with an evaporative light-scattering detector (HPLC/ELSD). Multi-walled carbon nanotubes (MWCNTs) modified by Fe3O4 nanoparticles obtained in a one-step synthetic procedure, were used as a sorbent to conveniently remove the analytes from water. Single factor experiments were performed to investigate the factors that affected the extraction efficiency, such as the hydroxyl content of the modified MWCNTs, the amount of sorbent, the type of elution solvent, the volume of elution solvent, sample pH and salting-out effect. Under the appropriate optimal conditions, the limits of detection (LODs) and limits of quantification (LOQs) for the three glycosides ranged from 0.16 mu g/mL to 0.60 mu g/mL and 0.58 mu g/mL to 1.24 mu g/mL, respectively. Moreover, the intra- and interday precision ranged from 1.9% to 2.9% and 2.4% to 4.5%, respectively. Meanwhile, the recoveries of spiked samples were measured, which ranged from 91.1% to 96.2% with relative standard deviations (RSDs) ranging from 2.8% to 3.8%. Accordingly, the application of the proposed method for the analysis of Chinese medicine injection samples offered several advantages: an acceptable precision, low LODs and good recoveries. This work might provide a research basis for the quality control of Chinese medicine injections and the further study of the Kang'ai injection.

关键词： Dispersive solid phase extraction Evaporative light-scattering detector Kang'ai injection

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Application of Cu²⁺-based electron spin resonance spectroscopy in measurement of antioxidant capacity of fruits

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ANALYTICAL AND BIOANALYTICAL CHEMISTRY 2019年第25期411卷 6677-6686页

作者： Tian, Sizhu li, xuwen Jiang, Jia Wang, Kun Zhang, Hanqi Yu, Aimin Zhang, Ziwei Jilin Univ Coll Chem Qianjin St 2699 Changchun 130012 Jilin Peoples R China

The antioxidant capacity of 22 kinds of fruits was measured by the developed electron spin resonance (ESR) method based on Cu2+ sensor. Cu2+ is reduced to Cu+ by the antioxidants in the fruits, and the remaining Cu2+ was determined by ESR and UV-Vis spectroscopy. Cu2+ can give an ESR signal whereas Cu+ cannot, and the loss of the ESR signal was used to quantify the antioxidant capacity of various fruits. The results were shown as vitamin C equivalent antioxidant capacity (VCEAC). The VCEAC values obtained by ESR and UV-Vis methods ranged from 24.23 to 688.61 mg/100 g and from 24.12 to 677.79 mg/100 g, respectively. Cupric ion reducing antioxidant capacity (CUPRAC) and 1,1-diphenyl-2-picryl-hydrazyl (DPPH) methods were employed for comparison. Based on Pearson's correlation test, the results obtained by CUPRAC and DPPH methods were both significantly correlated with these obtained by the present method, which indicated that the novel method was reliable. Total phenolic content for all kinds of fruits was measured with the Folin-Ciocalteu reagent, and VCEAC values obtained by the ESR method were significantly correlated with total phenolic contents.

关键词： Electron spin resonance Cu2+ reduction Fruits Antioxidant capacity VCEAC Total phenolic content

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11种园林地被植物在广州地区应用的综合评价

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绿色科技 2022年第17期24卷 37-40页

作者：沈荔荔马文卿李许文广州市名卉景观科技发展有限公司广东广州510420 广州建筑股份有限公司广东广州510030 广东省观赏园艺与立体绿化工程技术研究中心广东广州510420 广州市建筑集团有限公司广东广州510030

为构建适合广州地区的园林地被植物综合评价体系,对新引进的11种园林地被植物进行了观察,采用层次分析法,从生长特性、观赏特性、应用特性3个方面,提出了11个园林地被植物综合评价指标,构建了园林地被植物综合评价体系,并对新引进的11... 详细信息

为构建适合广州地区的园林地被植物综合评价体系,对新引进的11种园林地被植物进行了观察,采用层次分析法,从生长特性、观赏特性、应用特性3个方面,提出了11个园林地被植物综合评价指标,构建了园林地被植物综合评价体系,并对新引进的11个园林地被植物进行了评价。结果表明:紫蕨草、假紫苏生长速度快,适应性好,观赏性好,值得园林绿化种推广应用;禾叶大戟耐强光照至耐半荫,适合推广。

关键词：地被植物观赏特性应用特性生长特性层次分析法

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企业战略变革过程中的冲突影响研究——基于认知的视角

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系统工程理论与实践 2019年第5期39卷 1246-1255页

作者：李旭文齐中英哈尔滨工业大学管理学院哈尔滨150001 中国航天科技集团有限公司北京100048

本研究基于认知的视角,从理论上分析了企业战略变革过程中冲突的形成与影响,提出了战略变革知觉、战略变革响应与冲突关系假设模型,并开展了实证分析.研究表明,战略变革知觉与战略变革响应正相关,冲突在两者之间起到中介作用.

关键词：战略变革冲突认知

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Marine sponges of the genus Stelletta as promising drug sources: chemical and biological aspects

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Acta Pharmaceutica Sinica B 2019年第2期9卷 237-257页

作者： Qihao Wu Bastien Nay Min Yang Yeke Ni Hong Wang ligong Yao xuwen li State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences College of Pharmaceutical Science Zhejiang University of Technology Laboratoire de Synthèse Organique UMR 7652 CNRS Ecole Polytechnique Université Paris-Saclay

Marine sponges of the genus Stelletta are well known as rich sources of diverse and complex biologically relevant natural products, including alkaloids, terpenoids, peptides, lipids, and steroids. Some of these metabolites, with novel structures and promising biological activities, have attracted a lot of attention from chemists seeking to perform their total synthesis in parallel to intensive biological studies towards new drug leads. In this review, we summarized the distribution of the chemically investigated Stelletta sponges, the isolation, synthesis and biological activities of their secondary metabolites, covering the literature from 1982 to early 2018.

关键词： Marine natural products Stelletta sponge Isolation Total synthesis Biological activity Marine drug leads

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In-Situ Transformed Ni, S-Codoped CoO from Amorphous Co-Ni Sulfide as an Efficient Electrocatalyst for Hydrogen Evolution in Alkaline Media

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ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2019年第14期7卷 12501-12509页

作者： Lu, Wangting li, xuwen Wei, Feng Cheng, Kun li, Wenhui Zhou, Youhua Zheng, Wanquan Pan, Lei Zhang, Geng Jianghan Univ Inst Interdisciplinary Res 8 Sanjiaohu Rd Wuhan 430056 Hubei Peoples R China Jianghan Univ Sch Chem & Environm Engn 8 Sanjiaohu Rd Wuhan 430056 Hubei Peoples R China Univ Paris Saclay Univ Paris Sud CNRS Inst Sci Mol Orsay F-91405 Orsay France Jianghan Univ Sch Life Sci 8 Sanjiaohu Rd Wuhan 430056 Hubei Peoples R China Huazhong Agr Univ Coll Sci Dept Chem 1 Shizishan St Wuhan 430070 Peoples R China

Amorphous materials have recently received much attention as catalysts for electrochemical reactions. However, there are relatively few reports focused on the structure change of amorphous catalysts during the catalysis process, although this is quite important to the identification of active species and in revealing the reaction mechanism. Herein, amorphous Co-Ni sulfide in the form of a nanoplate and nanowire hybrid on the surface of nickel foam is prepared as the electrode for the hydrogen evolution reaction (HER). During the hydrogen evolution process, the amorphous Co-Ni sulfide is in-situ transformed into crystalline Ni, S-co-doped CoO which is actually responsible for the catalysis of HER The transformation process is studied in detail by high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and theoretical calculations. The in-situ formed electrode presents a high activity and durability toward HER in alkaline media. The Ni and S dopants, sulfurization temperature, and electrode substrate are revealed to be important factors that affect the activity. The present work will not only give more insights in the structure evolution of the electrocatalyst during HER but also provides a new strategy to the fabrication of new electrocatalysts.

关键词： Water splitting HER Amorphous material Oxide Doping

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Fast sulfurization of nickel foam-supported nickel-cobalt carbonate hydroxide nanowire array at room temperature for hydrogen evolution electrocatalysis

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ELECTROCHIMICA ACTA 2019年 318卷 252-261页

作者： Lu, Wangting li, xuwen Wei, Feng Cheng, Kun li, Wenhui Zhou, Youhua Zheng, Wanquan Pan, Lei Zhang, Geng Jianghan Univ Inst Interdisciplinary Res Wuhan 430056 Hubei Peoples R China Jianghan Univ Sch Chem & Environm Engn Wuhan 430056 Hubei Peoples R China Univ Paris Saclay Univ Paris Sud Inst Sci Mol Orsay CNRS F-91405 Orsay France Jianghan Univ Sch Life Sci Wuhan 430056 Hubei Peoples R China Huazhong Agr Univ Coll Sci Dept Chem Wuhan 430070 Hubei Peoples R China

Transition metal sulfide is considered as a kind of promising noble metal-free material for hydrogen evolution reaction (HER). However, most of conventional sulfurization methods require high temperature and/or long reaction time. Herein, a sulfurization strategy at room temperature (25 degrees C) by using Na2S in aqueous solution is applied to sulfurize nickel foam-supported nickel-cobalt carbonate hydroxide nanowire array, during which amorphous sulfide gradually forms on the surface of nanowire and finally replaces the nanowire completely. It is found that the electrode sulfurized for 5 min in which only a thin sulfide layer is formed presents nearly identical catalytic performance for HER with the electrode that is sufficiently sulfurized for 120 min. The electrode sulfurized at 25 degrees C for 5 min only needs an overpotential of 100 mV to achieve hydrogen evolution current at 10 mA cm(-2) in 1 M KOH, and negligible loss of activity is observed after working at a current density of 20 mA cm(-2) for 25 h. The interface between carbonate hydroxide and sulfide is considered to play an important role in the catalysis of HER. The observation in this work can provide new insights into the sulfurization process and the role of sulfide in the process of HER. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： HER Sulfide Amorphous Interface DFT

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一针法小切口重睑术的临床应用效果评价

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中国医疗美容 2024年第9期14卷 14-17页

作者：韩志强杜梦雨徐树岑田丽葛玉瑶李旭文徐静蚌埠医科大学第一附属医院整形烧伤科安徽蚌埠233000

目的探讨一针法小切口重睑术的临床应用。方法选取2023年1月至2024年1月于蚌埠医科大学第一附属医院接受重睑术的60例(120眼)患者行回顾性分析。其中30例接受一针法小切口重睑术,30例接受全切重睑术。比较两组患者的手术时间、患者满... 详细信息

目的探讨一针法小切口重睑术的临床应用。方法选取2023年1月至2024年1月于蚌埠医科大学第一附属医院接受重睑术的60例(120眼)患者行回顾性分析。其中30例接受一针法小切口重睑术,30例接受全切重睑术。比较两组患者的手术时间、患者满意度和并发症。结果观察组患者手术时间(22.07±2.92)min,低于对照组(63.40±5.90)min,差异有统计学学意义(P<0.001)。观察组患者非常满意90.0%(27/30),满意6.7%(2/30),不满意3.3%(1/30);对照组患者非常满意93.3%(28/30),满意6.7%(2/30)。两组患者满意度比较差异无统计学意义(P>0.05)。观察组患者术后并发症发生率为10.0%(3/30),低于对照组20.0%(6/30),但差异无统计学意义(P>0.05)。结论一针法小切口重睑术手术时间短、创伤小、瘢痕不明显,满意度高,适合手术初学者,值得在临床推广。

关键词：一针法小切口微创:重睑术

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