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YY0875-2013直线型吻合器(物理部分)检测与临床风险的讨论

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中国医疗器械信息 2024年第1期30卷 35-38,125页

作者：张泽鑫江苏省医疗器械检验所江苏南京210019

参照直线型吻合器行业标准YY0875-2013规定的物理检测要求和试验方法,对常见的一次性使用直线型吻合器物理性能进行检测分析,并对检验结果出现的问题结合临床使用可能出现的风险进行分析,以期对规范一次性使用直线型吻合器市场和提高其... 详细信息

参照直线型吻合器行业标准YY0875-2013规定的物理检测要求和试验方法,对常见的一次性使用直线型吻合器物理性能进行检测分析,并对检验结果出现的问题结合临床使用可能出现的风险进行分析,以期对规范一次性使用直线型吻合器市场和提高其产品质量有所帮助。

关键词：直线型吻合器物理性能临床风险

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关于吻合器行业研究及未来发展趋势的设想

中国医疗器械信息 2024年第3期30卷 64-67页

作者：张泽鑫江苏省医疗器械检验所江苏南京210019

就吻合器行业的现状以及发展趋势进行简要的介绍,包括相关标准、市场规模、产业链结构、行业发展趋势、主要企业分析、行业监管等,对当下吻合器存在的问题以及如何赢得未来发展的主动权等问题进行思考与设想。

关键词：吻合器产业结构发展趋势

废弃香蕉皮粉末对六价铬的吸附特性与机理研究

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生态与农村环境学报 2024年第7期40卷 954-963页

作者：马路路许利滢张泽新袁莹莹陈锋河南工程学院环境与生物工程学院河南郑州451191 东华大学环境科学与工程学院上海201620

研究了废弃香蕉皮粉末对六价铬〔Cr(Ⅵ)〕的吸附特性与机理。重点考察各种影响因素,利用等温线、动力学和热力学方程定量分析了吸附过程,并采用扫描电镜(SEM)、红外光谱(FTIR)和X射线光电子能谱(XPS)等手段探讨了吸附机理。结果表明:香... 详细信息

研究了废弃香蕉皮粉末对六价铬〔Cr(Ⅵ)〕的吸附特性与机理。重点考察各种影响因素,利用等温线、动力学和热力学方程定量分析了吸附过程,并采用扫描电镜(SEM)、红外光谱(FTIR)和X射线光电子能谱(XPS)等手段探讨了吸附机理。结果表明:香蕉皮粉末是一种优良的吸附剂,对Cr(Ⅵ)的吸附性能远高于其他生物质。香蕉皮粉末对Cr(Ⅵ)吸附的最佳pH值为2,吸附24 h时达到平衡,Cr(Ⅵ)初始浓度和温度越高,吸附效果就越好。3次吸附-解吸循环后,香蕉皮粉末对Cr(Ⅵ)的吸附容量仍达到初始吸附容量的93.7%。Langmuir和Freundlich方程均能用于描述香蕉皮粉末对Cr(Ⅵ)的吸附过程,表明存在单分子层和多分子层吸附,且为有利吸附。在298、308和318 K条件下,香蕉皮粉末对Cr(Ⅵ)的最大吸附量分别为149.25、161.29和169.49 mg·g^(-1)。准二级动力学模型更适用于拟合香蕉皮粉末对Cr(Ⅵ)的吸附过程,表明化学吸附占主导,发生电子转移。热力学参数表明,香蕉皮粉末对Cr(Ⅵ)的吸附是自发吸热熵增的反应。SEM结果显示,香蕉皮粉末呈片状结构,直径几十到数百微米,表面有褶皱和孔隙,提供了多个活性位点。SEM、FTIR和XPS分析结果表明,香蕉皮粉末对Cr(Ⅵ)的吸附机理包括静电吸引、氧化还原、表面螯合和离子交换。

关键词：废弃香蕉皮六价铬吸附特性机理

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华北典型针叶混交林林下更新影响因素分析

西北林学院学报 2024年第3期39卷 35-41页

作者：张泽鑫蔡有柱赵丽娟左亚凡程唱贺康宁北京林业大学水土保持学院北京100083 大通回族土族自治县宝库林场青海西宁810016

天然更新在维持森林稳定性与森林群落动态变化方面发挥重要作用,探究其相关影响因素,为促进研究区林下更新提供科学依据。以庞泉沟自然保护区云杉华北落叶松混交林为对象,基于灰色关联度方法从林分结构、立地条件两方面探究影响混交林... 详细信息

天然更新在维持森林稳定性与森林群落动态变化方面发挥重要作用,探究其相关影响因素,为促进研究区林下更新提供科学依据。以庞泉沟自然保护区云杉华北落叶松混交林为对象,基于灰色关联度方法从林分结构、立地条件两方面探究影响混交林林下更新的关键因素。结果表明:1)华北落叶松与云杉的混交林中,云杉幼苗351株、幼树172株,华北落叶松仅有幼苗39株、幼树36株,云杉的更新能力较强;2)华北落叶松、云杉混交林天然更新的影响因子关联度排序为树种组成>海拔>大小比>角尺度>林分密度>林龄>坡向>郁闭度>混交度>坡度;整体上看,天然更新对林分结构和立地因子均有显著响应,其中树种组成是影响天然更新的最主要林分非空间结构因子,海拔是影响天然更新的最主要立地因子,大小比、角尺度是影响天然更新的主要林分空间结构因子。因此,在调整未来林分时,可通过优化林分结构来促使云杉、华北落叶松混交林天然更新,从而提高林分稳定性。

关键词：天然更新林分稳定性立地条件林分结构灰色关联度

Cuk变换器指数趋近律滑模PI混合控制策略

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电力电子技术 2024年第07期58卷 60-63页

作者：房绪鹏王腾翡郭红震张泽心山东科技大学电气与自动化工程学院

Cuk变换器在发生参数突变和外部扰动时,传统比例积分(PI)控制不能得到满意的动态响应和抗扰性,且传统滑模控制多为电压单闭环设计,电压动态特性较双闭环控制差得多。为此,提出Cuk变换器的一种电压外环滑模控制、电流内环PI控制的控制策... 详细信息

Cuk变换器在发生参数突变和外部扰动时,传统比例积分(PI)控制不能得到满意的动态响应和抗扰性,且传统滑模控制多为电压单闭环设计,电压动态特性较双闭环控制差得多。为此,提出Cuk变换器的一种电压外环滑模控制、电流内环PI控制的控制策略。首先,在PI控制电流内环的基础上,外加滑模控制电压外环,设计基于指数趋近律的控制器,提高系统输出响应的动态性能。其次,给出所提控制器的稳定性分析和参数设计准则。最后,通过与传统双闭环PI控制进行仿真和实验对比,验证了所提控制器具有更好的动态性能和鲁棒性。

关键词：变换器滑模控制指数趋近律

Synergy between CSST galaxy survey and gravitational-wave observation: Inferring the Hubble constant from dark standard sirens

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 7-19页

作者： Ji-Yu Song Ling-Feng Wang Yichao Li ze-Wei Zhao Jing-Fei zhang Wen Zhao xin zhang Key Laboratory of Cosmology and Astrophysics(Liaoning)&College of Sciences Northeastern UniversityShenyang 110819China CAS Key Laboratory for Researches in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern UniversityShenyang 110819China Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education) Northeastern Universty Shenyang 110819China

Gravitational waves(GWs) from compact binary coalescences encode the absolute luminosity distances of GW sources. Once the redshifts of GW sources are known, one can use the distance-redshift relation to constrain cosmological parameters. One way to obtain the redshifts is to localize GW sources by GW observations and then use galaxy catalogs to determine redshifts from a statistical analysis of redshift information of the potential host galaxies, commonly referred to as the dark siren method. The third-generation(3G) GW detectors are planned to work in the 2030s and will observe numerous compact binary *** these GW events as dark sirens requires high-quality galaxy catalogs from future sky survey projects. The China Space Station Telescope(CSST) will be launched in 2024 and will observe billions of galaxies within a 17500 deg^(2) survey area with redshift up to z ~ 4, providing photometric and spectroscopic galaxy catalogs. In this work, we simulate the CSST galaxy catalogs and the 5-year GW data from the 3G GW detectors and combine them to infer the Hubble constant(H_(0)). Our results show that the measurement precision of H0could reach the sub-percent level, meeting the standard of precision cosmology. We conclude that the synergy between CSST and the 3G GW detectors is of great significance in measuring the Hubble constant.

关键词： CSST galaxy survey galaxy catalogs gravitational waves dark sirens the Hubble constant

Solar evaporation for simultaneous oil-water separation and electricity generation with Janus wood-based absorbers

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 13-23页

作者： Yue Yang ze Fu Qi zhang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science&TechnologyNanjing 210094China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesKey Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education)Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

Oily wastewater from ocean oil spills endangers marine ecosystems and human health. Therefore, developing an effective and sustainable solution for separating oil-water mixtures is urgent. Interfacial solar photothermal evaporation is a promising approach for the complete separation of two-phase mixtures using only solar energy. Herein, we report a carbonized wood-based absorber with Janus structure of comprising a hydrophobic top-layer and an oleophobic bottom-layer for simultaneous solar-driven oil-water separation and electricity generation. Under sunlight irradiation, the rapid evaporation of seawater will induce a separation of oil-water mixtures, and cause a high salt concentration region underlying the interface, while the bottom “bulk water” maintains in a low salt concentration, thus forming a salinity gradient. Electricity can be generated by salinity gradient power. Therefore, oil-water separation efficiency of > 99% and derived extra electricity power of ~0.1 W/m2 is achieved under solar radiation, demonstrating the feasibility of oil-water separation and electricity production synchronously directly using solar energy. This work provides a green and cost-effective path for the separation of oil-water mixtures.

关键词： Oily wastewater Carbonized wood Salinity gradient Electricity generation Solar irradiation

Sensing properties and mechanisms of LaF_(3)-Co_(3)O_(4) nanorods for low-concentration methanol detection

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Rare Metals 2024年第5期43卷 2193-2204页

作者： Xiao-Xi He Hong-Feng Chai Yi-Wen Zhou Ke-Wei Liu ze-xin Yu Chao zhang College of Mechanical Engineering Yangzhou UniversityYangzhou225127China Institutefor Manufacturing Technologies of Ceramic Components and Composites(IMTCCC) University of Stuttgart70569 StuttgartGermany

Methanol is one of the characteristic gases that distinguish between healthy individuals and lung cancer(LC)lesions in exhaled human *** concentration in exhaled breath is generally below one part per million(1×10^(-6)).The second-phase composite is widely regarded as one of the methods to improve the gas-sensing perfor-mance of metal oxide semiconductor(MOS)*** this study,LaF_(3)-Co_(3)O_(4) was synthesized by a simple hydrothermal method to enhance its low-concentration methanol gas-sensing performance.5 at%LaF_(3)-Co_(3)O_(4) nanorods exhibited excellent methanol detection performance,including a wider linear detection concentration range(0.2×10^(-6)~5×10^(-6)),a response value exceeding 4.0 for 1×10^(-6)methanol at 275°C and 75%relative humidity(RH),long-term stability(maximum deviation within 15%over 2 weeks),and excellent *** mechanism of performance enhancement was studied using various techniques,and density functional *** special spinel structure of Co_(3)O_(4),the high ionic migration of F-in LaF_(3),the larger specific surface area of 5 at%LaF_(3)-Co_(3)O_(4) nanorods,and the generated crystal defects all explain the excellentmethanol gas-sensing *** work provides a novel route to prepare MOS composite materials for low-concentration methanol gas detection.

关键词： Gas sensor LaF_(3) Co_(3)O_(4) Methanol Lung cancer

Evaluating the thermal environment of urban land surfaces in Yakutsk,a city located in a region of continuous permafrost

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Advances in Climate Change Research 2024年第1期15卷 113-123页

作者： Xiang-Long LI ze zhang Jin-xin LU Anatoli BROUCHKOV Qing-Kai YAN Qi-Hao YU Sheng-Rong zhang Andrey MELNIKOV School of Civil Engineering and Transportation Institute of Cold Regions Science and EngineeringPermafrost InstituteNortheast Forestry UniversityHarbin150040China China Railway Qinghai-Tibet Group Company Xining 810000China Department of Geocryology Faculty of GeologyLomonosov Moscow State UniversityMoscow 119234Russian Federation State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco Envi ronment and Re sourcesChinese Academy of SciencesLanzhou 730000China Melnikov Permafrost Institute Siberian BranchRussian Academy of ScienceYakutsk 677010Russian Federation

Rapid urbanization has led to changes in the urban land surface thermal ***,there are still much unknown about the urban land surface thermal conditions in permafrost *** is a unique geological environment,changes in the urban land surface thermal environment may trigger geological disasters caused by permafrost *** study utilized remote sensing data and geographic de-tectors to identify the dynamic changes in land surface temperature(LST)and land use/land cover(LU/LC)in Yakutsk,as well as the potential factors contributing to LST *** 1992 and 2020,the built-up area in Yakutsk increased by 36%,and the annual average LST in Yakutsk has risen by 6.67℃,accompanied by an expansion of high-temperature *** ongoing greening efforts,rapid urbanization poses a threat to these green *** in the normalized difference built-up index(NDBI)and land use transfer(LDT)were identified as the primary drivers of urban LST *** integrating geographic detector technology and artificial neural network models,we optimized the selection of input factors in the prediction model and used it to explore the future changes in LST in *** average LST in Yakutsk is expected to reach 23.4℃ and 25.1℃ in 2030 and 2040,respectively,with a further increase in high-temperature *** study provides a reference for ecological,hydrological,and geological assessments of cities in permafrost regions.

关键词： Remote sensing Land surface temperature Land use/Land cover Permafrost Yakutsk