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2017-2020年抚顺市农村土壤卫生监测结果分析及评价

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实验室检测

实验室检测 2024年第5期2卷 112-114页

作者：辛维宇抚顺市疾病预防控制中心

目的了解2017-2020年抚顺市农村土壤卫生状况，为制定相关政策和评估土壤风险，提供具体的数据。方法监测分析2017年至2020年抚顺市农村土壤卫生的具体数据。随机选择20个监测点进行土壤监测，测定土壤中寄生虫、重金属等相关指标的... 详细信息

目的了解2017-2020年抚顺市农村土壤卫生状况，为制定相关政策和评估土壤风险，提供具体的数据。方法监测分析2017年至2020年抚顺市农村土壤卫生的具体数据。随机选择20个监测点进行土壤监测，测定土壤中寄生虫、重金属等相关指标的含量。结果大窝棚村2020年铅含量达到645 mg/kg；中心屯村铅含量达到2035 mg/kg，镉含量达到1.22 mg/kg，其余各项指标均未超标。结论 2017-2020年抚顺市农村土壤卫生状况整体良好，但是个别年份个别区域也有超标情况，须持续加强监测，防患于未然。

关键词：农村管理土壤卫生抚顺市监测水平

神经内镜经鼻颅脑肿瘤术后颅内感染危险因素模型构建及评价

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中华医院感染学杂志 2024年第4期34卷 517-521页

作者：韩玮于鑫玮胡爱香曹磊张越巍首都医科大学附属北京天坛医院感染管理处北京100070 首都医科大学附属北京天坛医院神经外科北京100070

目的分析神经内镜经鼻颅脑肿瘤手术后颅内感染的危险因素,建立风险预测模型并进行效果评价.方法选取首都医科大学附属北京天坛医院神经外科某病区2022年1-6月行神经内镜经鼻颅脑肿瘤手术患者439例为研究对象,根据是否发生手术后颅内感... 详细信息

目的分析神经内镜经鼻颅脑肿瘤手术后颅内感染的危险因素,建立风险预测模型并进行效果评价.方法选取首都医科大学附属北京天坛医院神经外科某病区2022年1-6月行神经内镜经鼻颅脑肿瘤手术患者439例为研究对象,根据是否发生手术后颅内感染分为感染组(38例)和非感染组(401例),收集相关临床资料,采用Logistic回归分析归纳手术后颅内感染的危险因素并构建模型,并采用受试者工作特征(ROC)曲线评价模型.结果神经外科颅脑肿瘤手术患者颅内感染率为8.66%(38/439);手术时间、术中打开硬脑膜、放置腰大池引流管、术后发生脑脊液鼻漏是神经内镜经鼻颅脑肿瘤术后颅内感染的危险因素(P<0.05);构建列线图模型并进行验证,ROC曲线显示该模型曲线下面积为0.849(95%CI:0.789~0.909),验证效果较好(X^(2)=4.904,P=0.768).结论构建神经内镜经鼻颅脑肿瘤手术后颅内感染风险预测模型,可识别早期高风险患者,为采取预防措施提供参考.

关键词：神经系统内镜手术颅内感染危险因素预测模型列线图

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经鼻颅底肿瘤切除术后颅内感染危险因素与直接经济损失

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中华医院感染学杂志 2024年第10期34卷 1534-1538页

作者：胡爱香李静于鑫玮程实韩玮李储忠张越巍首都医科大学附属北京天坛医院感染管理处北京100070 首都医科大学附属北京天坛医院神经外科学中心北京100070

目的分析经鼻颅底肿瘤切除术后发生颅内感染的危险因素和直接经济损失。方法选取2022年1月-6月首都医科大学附属北京天坛医院神经外科收治的经鼻颅底肿瘤切除术患者385例作为研究对象,根据患者术后是否发生颅内感染分为感染组和非感染... 详细信息

目的分析经鼻颅底肿瘤切除术后发生颅内感染的危险因素和直接经济损失。方法选取2022年1月-6月首都医科大学附属北京天坛医院神经外科收治的经鼻颅底肿瘤切除术患者385例作为研究对象,根据患者术后是否发生颅内感染分为感染组和非感染组。多因素Logistic回归分析术后颅内感染的危险因素,以年龄和性别作为匹配因素,做1∶1匹配病例对照研究,比较感染导致的直接经济损失和住院时长。结果385例经鼻颅底肿瘤切除术患者术后共发生颅内感染33例,颅内感染率8.57%;多因素Logistic回归分析显示,脑室腹腔分流管、猪源纤维蛋白黏合剂、脑室外引流管的使用和手术时长是术后颅内感染的危险因素(P<0.05);感染组住院总费用较非感染组多19951.95元(P<0.05),各项分类费用中,中位数差值最高的是抗菌药物费,感染组抗菌药物费较非感染组多9828元(P<0.05),感染组较非感染组术后住院时间延长,住院天数(中位数)增加了5 d(P<0.05)。结论经鼻颅底肿瘤切除术患者有脑室腹腔分流管、脑室外引流管、猪源纤维蛋白黏合剂是颅内感染的危险因素,应尽量严格植入物的使用指征并尽早拔除。患者感染后直接经济损失显著,住院时间明显延长。

关键词：颅底肿瘤经鼻颅底肿瘤切除术术后感染神经内镜颅内感染危险因素经济损失

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Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose-Einstein Condensate in a Double Cavity

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Chinese Physics Letters 2024年第6期41卷 44-48页

作者： Bo-Hao Wu xin-xin Yang yu Chen wei Zhang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Graduate School of China Academy of Engineering Physics Beijing 100193China Beijing Academy of Quantum Information Sciences Beijing 100193China

We study superradiant phase transitions in a hybrid system of a two-dimensional Bose–Einstein condensate of atoms and two cavities arranged with a tilt *** adjusting the loss rate of cavities,we map out the phase diagram of steady states within a mean field *** is found that when the loss rates of the two cavities are different,superradiant transitions may not occur at the same time in the two cavities.A first-order phase transition is observed between the states with only one cavity in superradiance and both in *** the case that both cavities are superradiant,a net photon current is observed flowing from the cavity with small decay rate to the one with large decay *** photon current shows a non-monotonic dependence on the loss rate difference,owing to the competition of photon number difference and cavity field phase *** findings can be realized and detected in experiments.

关键词： Einstein transitions decay

Automated Identification of Ordered Phases for Simulation Studies of Block Copolymers

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Chinese Journal of Polymer Science 2024年第5期42卷 683-692,I0011页

作者： yu-Chen Zhang wei-Ling Huang Yi-xin Liu State Key Laboratory of Molecule Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

In unit cell simulations,identification of ordered phases in block copolymers(BCPs)is a tedious and time-consuming task,impeding the advancement of more streamlined and potentially automated research *** this study,we propose a scattering-based automated identification strategy(SAIS)for characterization and identification of ordered phases of BCPs based on their computed scattering *** approach leverages the scattering theory of perfect crystals to efficiently compute the scattering patterns of periodic morphologies in a unit *** the first stage of the SAIS,phases are identified by comparing reflection conditions at a sequence of Miller *** confirm or refine the identification results of the first stage,the second stage of the SAIS introduces a tailored residual between the test phase and each of the known candidate ***,our strategy incorporates a variance-like criterion to distinguish background species,enabling its extension to multi-species BCP *** has been demonstrated that our strategy achieves exceptional accuracy and robustness while requiring minimal computational ***,the approach allows for real-time expansion and improvement to the candidate phase library,facilitating the development of automated research workflows for designing specific ordered structures and discovering new ordered phases in BCPs.

关键词： Block copolymer Phase identification Scattering function

Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

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Rare Metals 2024年第4期43卷 1758-1768页

作者： Cun-Cheng Li Ming-wei Zhang Ji-Wu xin Lei wei Wen-yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

Drinking water quality & health risk assessment of secondary water supply systems in residential neighborhoods

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 47-62页

作者： Yating wei Dong Hu Chengsong Ye Heng Zhang Haoran Li xin yu College of the Environment&Ecology Xiamen UniversityXiamen 361102China School of Public Health Shandong First Medical University&Shandong Academy of Medical SciencesJinan 250117China

Secondary water supply systems(SWSSs)are important components of the water supply infrastructure that ensure residents’drinking water *** are characterized by long detention time,warm temperature,and unreasonable management,which may trigger the deterioration of water quality and increase *** this study,drinking water quality index(DWQI)and health risk assessment(HRA)were selected and modified to quantitatively assess the water quality and health risks of SWSSs in residential *** total,121 seasonal water samples were *** was observed that the water quality was excellent with the DWQI of 0.14±0.04,excluding one sample,which was extremely poor owing to its excessive total bacterial *** HRA results revealed that the health risks were low:negligible non-carcinogenic risk for any population;negligible and acceptable carcinogenic risk for children aged 6–17 and ***,samples revealed higher carcinogenic risk(7.63×10−5±3.29×10−6)for children aged 0–5,and arsenic was the major *** samples had poor water quality and higher health risks,which called for *** further investigate the water quality and health risks of SWSSs,monthly sampling was conducted during *** 24 water samples were qualified in Chinese standard(GB 5749-2022)and characterized as excellent *** HRA results were consistent with the seasonal samples’and the health risks were mainly concentrated in ***,our study provides a suitable framework for water quality security,advice for managers,and references for administrators in other cities.

关键词： Drinking water quality Water quality index Health risk assessment Secondary water supply systems Heavy metals

Rotating Massive Strangeon Stars and X-Ray Plateau of Short GRBs

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Research in Astronomy and Astrophysics 2024年第3期24卷 47-57页

作者： Xi-Yan Yang Xiao-yu Lai wei-wei Tan Ren-xin Xu School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China Research Center for Astronomy Hubei University of EducationWuhan 4300205China Key Laboratory of Quark and Lepton Physics Central China Normal UniversityMinistry of EducationWuhan 430079China School of Physics Peking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

Strangeon stars,which are proposed to describe the nature of pulsar-like compact stars,have passed various observational *** maximum mass of a non-rotating strangeon star could be high,which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon *** study rigidly rotating strangeon stars in the slowly rotating approximation,using the Lennard-Jones model for the equation of *** can significantly increase the maximum mass of strangeon stars with unchanged baryon numbers,enlarging the mass-range of long-lived strangeon *** spin-down after merger,the decrease of radius of the remnant will lead to the release of gravitational *** into account the efficiency of converting the gravitational energy luminosity to the observed X-ray luminosity,we find that the gravitational energy could provide an alternative energy source for the plateau emission of X-ray *** fitting results of X-ray plateau emission of some short gamma-ray bursts suggest that the magnetic dipole field strength of the remnants can be much smaller than that of expected when the plateau emission is powered only by spin-down luminosity of magnetars.

关键词： dense matter-(stars) pulsars general-(stars) gamma-ray burst general

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多机场终端区多场景运行仿真建模与性能评估

航空计算技术 2024年第2期54卷 57-61页

作者：许辰澄江斌许蕾许文佳郁欣蔚中国民用航空华东地区空中交通管理局上海200000 南京航空航天大学江苏南京211000 上海虹桥国际机场有限责任公司上海201000 中国东方航空股份有限公司上海201000

复杂终端区内多机场、进离场之间耦合交互,导致空域容量难以准确评估与整体提升,为此研究了多机场终端区多场景运行仿真建模与综合评估问题。考虑航向引导调配、等待空域配置等不同策略因素,设计多元化的多机场终端区运行场景集合,构建... 详细信息

复杂终端区内多机场、进离场之间耦合交互,导致空域容量难以准确评估与整体提升,为此研究了多机场终端区多场景运行仿真建模与综合评估问题。考虑航向引导调配、等待空域配置等不同策略因素,设计多元化的多机场终端区运行场景集合,构建基于AirTOp的多机场终端区运行仿真模型,从安全、效率和容量三个视角提出了多机场终端区运行综合评估方法,并选取某终端区进行实例验证分析。仿真结果表明,所建模型及方法可对不同场景下的复杂终端区进离场活动进行精细化仿真,并准确评估复杂终端区多场景运行能力,为复杂终端区运行管理提供关键数据支撑和建模参考依据。

关键词：民用航空多机场终端区多场景计算机仿真性能评估