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Characteristics of sea ice kinematics from the marginal ice zone to the packed ice zone observed by buoys deployed during the 9th Chinese Arctic Expedition

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Acta Oceanologica Sinica 2022年第7期41卷 113-127页

作者： xiaomin chang Longchun Ye Guangyu Zuo Jingyue Li Keyu Wei Yinke Dou College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan030024China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan030024China

Sea ice growth and consolidation play a significant role in heat and momentum exchange between the atmosphere and the ocean.However,few in situ observations of sea ice kinematics have been reported owing to difficulties of deployment of buoys in the marginal ice zone(MIZ).To investigate the characteristics of sea ice kinematics from MIZ to packed ice zone(PIZ),eight drifting buoys designed by Taiyuan University of Technology were deployed in the open water at the ice edge of the Canadian Basin.Sea ice near the buoy constantly increased as the buoy drifted,and the kinematics of the buoy changed as the buoy was frozen into the ice.This process can be determined using sea ice concentration,sea skin temperature,and drift speed of buoy together.Sea ice concentration data showed that buoys entered the PIZ in mid-October as the ice grew and consolidated around the buoys,with high amplitude,high frequency buoy motions almost ceasing.Our results confirmed that good correlation coefficient in monthly scale between buoy drift and the wind only happened in the ice zone.The correlation coefficient between buoys and wind was below 0.3 while the buoys were in open water.As buoys entered the ice zone,the buoy speed was normally distributed at wind speeds above 6 m/s.The buoy drifted mainly to the right of the wind within 45°at wind speeds above 8 m/s.During further consolidation of the ice in MIZ,the direct forcing on the ice through winds will be lessened.The correlation coefficient value increased to 0.9 in November,and gradually decreased to 0.7 in April.

关键词： sea ice kinematics buoy observations remote sensing marginal ice zone

Intrauterine Treatment of Monochorionic Triamniotic Triplet Pregnancy with Twin Reverse Arterial Perfusion Sequence

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Maternal-Fetal Medicine 2024年第2期6卷 120-123页

作者： xiaomin Zhao Yongmei Shen Lying Yao Lei Zhang Shanshan Li Wen Li Hong Yu Ling Chen Ying chang Tianjin Key Laboratory of Human Development and Reproductive Regulation Tianjin Central Hospital of Obstetrics and Gynecology/Nankai University Affiliated Maternity HospitalTianjin 300100China Prenatal Diagnosis Center Tianjin Central Hospital of Obstetrics and Gynecology/Nankai University Affiliated Maternity HospitalTianjin 300100China Radiology Department Tianjin Central Hospital of Obstetrics and Gynecology/Nankai University Affiliated Maternity HospitalTianjin 300100China Pathology Department Tianjin Central Hospital of Obstetrics and Gynecology/Nankai University Affiliated Maternity HospitalTianjin 300100China.

To editor:This study reports a pregnant woman who was naturally conceived with monochorionic triamniotic(MCTA)combined with twin reversed arterial perfusion(TRAP).An ultrasound revealed that one of the fetuses had a cardiac malformation,and a connection between the umbilical arteries was suspected.To reduce the acardiac fetus,radiofrequency ablation was performed at 17+3 weeks of pregnancy.At 36+4 weeks,two healthy infants were delivered via elective cesarean section.Postoperative examination revealed a direct connection between the umbilical arteries,with the placental perfusion acting as a direct pump.It is essential to identify the intrauterine status of the blood-supplying infant and vascular connections in order to achieve successful outcomes in pregnancies with complications,such as edema and heart failure.The studies involving human participants were reviewed and approved by Human Research Ethics Committee of Tianjin Central Hospital of Obstetrics and Gynecology.The patient provided her written informed consent to participate in this study.

关键词： Twinning Embryonic Monochorionic triamniotic Twin reversed arterial perfusion sequence Fetus reduction Placental perfusion

Research on ultrasonic-based investigation of mechanical properties of ice

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Acta Oceanologica Sinica 2021年第10期40卷 97-105页

作者： xiaomin chang Wenhao Liu Guangyu Zuo Yinke Dou Yan Li College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China

Arctic sea ice area and thickness have declined dramatically during the recent decades.Sea ice physical and mechanical properties become increasingly important.Traditional methods of studying ice mechanical parameters such as ice-coring cannot realize field test and long-term observation.A new principle of measuring mechanical properties of ice using ultrasonic was studied and an ultrasonic system was proposed to achieve automatic observation of ice mechanical parameters(Young’s modulus,shear modulus and bulk modulus).The ultrasonic system can measure the ultrasonic velocity through ice at different temperature,salinity and density of ice.When ambient temperature decreased from 0°C to-30°C,ultrasonic velocity and mechanical properties of ice increased,and vice versa.The shear modulus of the freshwater ice and sea ice varied from 2.098 GPa to 2.48 GPa and 2.927 GPa to 4.374 GPa,respectively.The bulk modulus of freshwater ice remained between 3.074 GPa and4.566 GPa and the sea ice bulk modulus varied from 1.211 GPa to 3.089 GPa.The freshwater ice Young’s modulus kept between 5.156 GPa and 6.264 GPa and sea ice Young’s modulus varied from 3.793 GPa to 7.492 GPa.The results of ultrasonic measurement are consistent with previous studies and there is a consistent trend of mechanical modulus of ice between the process of ice temperature rising and falling.Finally,this ultrasonic method and the ultrasonic system will help to achieve the long-term observation of ice mechanical properties of ice and improve accuracy of sea ice models.

关键词： ice mechanical properties ultrasonic testing spectrum analysis

压滤过程中煤泥滤饼结构演化规律及组合药剂优化机理

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煤炭学报 2024年第3期49卷 1611-1624页

作者：马晓敏孙筱淞董宪姝樊玉萍常明太原理工大学矿业工程学院山西太原030024 矿冶过程智能优化制造全国重点实验室北京100160 矿冶过程自动控制技术北京市重点实验室北京100160

煤泥滤饼结构对脱水效果有重要影响,采用自制加压脱水装置及CT扫描等方法研究了压滤脱水过程中滤饼结构特性及其演化规律。将压滤过程修正为4个阶段,其中滤饼脱水阶段主要脱去滤饼内部水分,此阶段滤饼孔隙结构越发达则压滤脱水效果越好... 详细信息

煤泥滤饼结构对脱水效果有重要影响,采用自制加压脱水装置及CT扫描等方法研究了压滤脱水过程中滤饼结构特性及其演化规律。将压滤过程修正为4个阶段,其中滤饼脱水阶段主要脱去滤饼内部水分,此阶段滤饼孔隙结构越发达则压滤脱水效果越好;滤饼压缩阶段主要对滤饼进行最后压缩,此阶段滤饼可压缩性越高,滤饼最终的孔隙率和含水量就越低。并采用聚合硫酸铁(PFS)和α-半水石膏(α-HH)对煤泥进行助滤实验。从煤泥颗粒絮团结构、滤饼物相组成、滤饼三维结构等多方面分析了助滤机理。结果表明:PFS和α-HH联合使用显著提升了煤泥的过滤效果,通过中心组合设计(CCD),确定了2者最佳药剂量为1711.44 g/t和48.33 mg/g。在最佳条件下,滤饼含水量降低至16.97%,过滤速度提高至145.89 mL/(s·m^(2))。α-HH的加入使滤液Zeta电位的绝对值降低到1.45 mV,从而降低了煤泥颗粒之间的静电排斥力,增强了PFS的絮凝效果,使絮状物的弦长增加到71~171μm。同时在PFS体系中,α-HH的水化反应被加速,形成大量二水石膏晶体,在煤泥絮体中形成交织的骨架,发挥了骨架构建体的作用,使煤泥压滤脱水指数(I_(CD))提升至176.30,增强了滤饼强度,使压滤过程中煤泥滤饼孔隙率从12.14%提高到14.39%,提高了煤泥滤饼的孔隙配位数及连通性从而提高了过滤效果。

关键词：煤泥脱水滤饼结构压滤过程 CT 骨架构建体

基于结构变动度及灰色关联的DRG付费对妇科肿瘤住院患者住院费用的影响

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中国药师 2024年第4期27卷 622-630页

作者：顾晓敏刘畅湖州市中心医院病案管理中心浙江湖州313000

目的探究妇科肿瘤住院费用变动的主要类别和变化方向,为有效控制住院费用、完善医保基金支付方案提供对策和建议。方法收集2020年1月至2022年12月在湖州市中心医院出院的患者费用信息,采用结构变动度及灰色关联的疾病诊断相关分组(DRG... 详细信息

目的探究妇科肿瘤住院费用变动的主要类别和变化方向,为有效控制住院费用、完善医保基金支付方案提供对策和建议。方法收集2020年1月至2022年12月在湖州市中心医院出院的患者费用信息,采用结构变动度及灰色关联的疾病诊断相关分组(DRG)付费方式进行分析,并观察其相互关联程度。结果 2020至2022年2138例妇科肿瘤患者次均住院费用呈下降趋势。患者住院费用结构显示,手术费、检验费占比较高,护理费、治疗费占比较低。患者住院结构变化显示,材料费逐渐降低,操作费、床位费、病理费、护理费逐渐升高,诊疗费、药品费、放射费、检验费、治疗费、手术费、其他费用先降后升。在2020至2022年妇科肿瘤住院费用中,与住院费用关联最大的为手术费、药品费、检验费,关联最小的为床位费、护理费、治疗费,其患者住院费用占比排序基本与关联度保持一致。2020至2022年妇科肿瘤住院费用结构变动度为13.67%,其中2020年至2021年结构变动度为14.61%,2021至2022年结构变动度为10.77%。结构变动方向显示,2020至2022操作费、床位费、病理费、护理费为正向变动,其中手术费变动较大。2020至2022年妇科肿瘤住院费用结构变动贡献率最大的为手术费,占比37.29%,其次为检验费,占比13.08%。不同时间段,各类费用对次均住院费用的结构变动贡献率不同,2020至2021年住院费用结构变动贡献率最大的为手术费,占比33.05%,其次为药品费,占比12.05%,2021至2022年住院费用结构变动贡献率最大的为手术费,占比48.00%,其次为药品费,占比16.85%。相关性分析显示,患者的住院费用与医保类型、住院天数有关(P <0.05)。结论妇科肿瘤患者的次均住院费用得到有效控制,其临床住院费用逐渐合理化,但材料费、手术费仍对患者的住院费用影响较大,表明临床医务人员的劳动价值费用增加较少,DRG付费可使临床医疗费用得到一定的控制,后续仍需进一步优化,完善配套政策,提升医务人员的技术价值,并加强对医用耗材的管理。

关键词：妇科肿瘤结构变动度按疾病诊断相关分组灰色关联住院费用

钚同位素示踪技术在树木年轮中的应用研究进展

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地理科学 2024年第5期44卷 911-916页

作者：曹立国周正朝常晓娇曾小敏王宁陕西师范大学地理科学与旅游学院陕西西安710119 大连市现代农业生产发展服务中心辽宁大连116000

钚(Pu)核素具有极强的辐射毒性和生物毒性,对动植物和人类健康危害巨大,分析Pu同位素在树轮中的水平、迁移规律及其污染历史对于潜在的生态安全和植物毒性评价至关重要。在中国核电事业快速发展的背景下,建立不同区域树轮的Pu同位素背... 详细信息

钚(Pu)核素具有极强的辐射毒性和生物毒性,对动植物和人类健康危害巨大,分析Pu同位素在树轮中的水平、迁移规律及其污染历史对于潜在的生态安全和植物毒性评价至关重要。在中国核电事业快速发展的背景下,建立不同区域树轮的Pu同位素背景数据尤为迫切。为此,本文对目前现存的少量文献资料进行了总结和归纳,首先简要阐述了环境中Pu同位素来源与沉降模式;重点分析了Pu同位素进入树轮的潜在途径,以及Pu同位素在树轮中的径向分布特征及其指示意义;最后,本文强调了建立树轮Pu同位素化学分析测试方法的重要性,及其示踪应用的发展方向,对于促进和拓展树轮Pu同位素示踪研究具有重要现实意义。

关键词： ^(239+240)Pu ^(137)Cs 树木年轮核素示踪

Exploring Sulfur Chemistry in TMC-1 with NSRT

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Chinese Physics Letters 2024年第2期41卷 129-132页

作者： Wasim Iqbal Xiaohu Li Juan Tuo Ryszard Szczerba Yanan Feng Zhenzhen Miao Jiangchao Yang Jixing Ge Gleb Fedoseev Donghui Quan Qiang chang Chuan-Lu Yang Tao Yang Gao-Lei Hou Yong Zhang Xuan Fang Xia Zhang Fangfang Li Rong Ma xiaomin Song Zhiping Kou Yuxuan Sun Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Radio Astrophysics Urumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Nicolaus Copernicus Astronomical Center Rabia´nska 887-100 Toru´nPoland Research Laboratory for Astrochemistry Ural Federal UniversityKuibysheva St.48620026 EkaterinburgRussia Astronomical Computing Research Center Zhejiang LaboratoryHangzhou 311100China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China School of Physics and Optoelectronic Engineering Ludong UniversityYantai 264025China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China School of Physics and Astronomy Sun Yat-sen UniversityGuangzhou 510275China Laboratory for Space Research Faculty of ScienceThe University of Hong KongHong KongChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China

There have been several studies on sulfur depletion in dense cores like TMC-1(Taurus Molecular Cloud 1),employing updated reaction networks for sulfur species to explain the missing sulfur in the gas within dense clouds.Most of these studies used a C/O ratio of 0.7 or lower.We present NSRT(NanShan 26m Radio Telescope)observations of TMC-1 alongside results from time-dependent chemical simulations using an updated chemical network.Our findings highlight the impact of the C/O ratio on the gas-phase evolution of C2S and C3S.The simulation results show that the C/O ratio is an important parameter,playing a fundamental role in determining the gas-phase abundances of sulfur species in dense cores.

关键词： sulfur Sulfur depletion

园长视角下普惠性民办幼儿园教育质量保障机制构建研究

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新乡学院学报 2024年第2期41卷 65-68,76页

作者：陆畅李晓敏湖南师范大学教育科学学院湖南长沙410081 河南大学教育学部河南开封475000

普惠性民办幼儿园建设是我国推动学前教育普惠优质发展的重大战略部署,也是促进教育公平、实现“幼有所育、幼有优育”的重要抓手。已有研究多从政策视角自上而下建构一套保障机制,但该机制缺乏对园长视角的关照,导致部分政策在落地过... 详细信息

普惠性民办幼儿园建设是我国推动学前教育普惠优质发展的重大战略部署,也是促进教育公平、实现“幼有所育、幼有优育”的重要抓手。已有研究多从政策视角自上而下建构一套保障机制,但该机制缺乏对园长视角的关照,导致部分政策在落地过程中遭受冷遇。为了探讨园长视角下保障园所发展的体制机制,本研究通过对29位普惠性民办园园长或副园长进行半结构式访谈,运用扎根理论对近20万字的访谈资料进行三级编码,最终提炼出园长视角下四个维度的保障机制,通过归类分析构建出目标长效机制、主体保障机制、监督评估机制、奖惩激励机制四维度的普惠性民办园教育质量保障机制。

关键词：普惠性民办幼儿园教育质量保障机制

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共同富裕视角下的三次分配与税制改革

山东财经大学学报 2024年第3期36卷 5-15,41页

作者：蔡昌曹晓敏吴奕萱中央财经大学财政税务学院北京100101

共同富裕是社会主义的本质特征和要求,也是我国发挥大国优势的重要体现。但是,目前我国居民之间、城乡之间、地区之间的收入差距依然较大,相对贫困依然存在,这既不利于经济社会的稳定和发展,也不利于共同富裕目标的实现。发挥三次分配... 详细信息

共同富裕是社会主义的本质特征和要求,也是我国发挥大国优势的重要体现。但是,目前我国居民之间、城乡之间、地区之间的收入差距依然较大,相对贫困依然存在,这既不利于经济社会的稳定和发展,也不利于共同富裕目标的实现。发挥三次分配活动的协同机制,实现三次分配与税制改革的有效配合,是我国缩小收入差距、实现共同富裕的重要途径。初次分配是基础,重在“做大蛋糕”;再分配是调节,重在“切好蛋糕”;第三次分配是补充,重在“分好蛋糕”。而税收与三次分配存在底层逻辑关联,促进共同富裕要求做好收入分配与税收领域的制度安排,正确处理政府与市场、收入流量与财富存量、公平与效率的辩证关系,坚持以人民为中心、在高质量发展中实现共同富裕。

关键词：共同富裕三次分配税制改革