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Tidal modeling based on satellite altimetry observations of TOPEX/ Poseidon, Jason1, Jason2, and Jason3 with high prediction capability: A case study of the Baltic Sea
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作者 Alireza A.Ardalan Asiyeh Hashemifaraz 《Geodesy and Geodynamics》 EI CSCD 2024年第4期404-418,共15页
This research aims to optimize the utilization of long-term sea level data from the TOPEX/Poseidon,Jason1,Jason2,and Jason3 altimetry missions for tidal modeling.We generate a time series of along-track observations a... This research aims to optimize the utilization of long-term sea level data from the TOPEX/Poseidon,Jason1,Jason2,and Jason3 altimetry missions for tidal modeling.We generate a time series of along-track observations and apply a developed method to produce tidal models with specific tidal constituents for each location.Our tidal modeling methodology follows an iterative process:partitioning sea surface height(SSH)observations into analysis/training and prediction/validation parts and ultimately identi-fying the set of tidal constituents that provide the best predictions at each time series location.The study focuses on developing 1256 time series along the altimetry tracks over the Baltic Sea,each with its own set of tidal constituents.Verification of the developed tidal models against the sSH observations within the prediction/validation part reveals mean absolute error(MAE)values ranging from 0.0334 m to 0.1349 m,with an average MAE of 0.089 m.The same validation process is conducted on the FES2014 and EOT20 global tidal models,demonstrating that our tidal model,referred to as BT23(short for Baltic Tide 2023),outperforms both models with an average MAE improvement of 0.0417 m and 0.0346 m,respectively.In addition to providing details on the development of the time series and the tidal modeling procedure,we offer the 1256 along-track time series and their associated tidal models as supplementary materials.We encourage the satellite altimetry community to utilize these resources for further research and applications. 展开更多
关键词 Satellitealtimetry Baltic Sea Ocean tide modeling Jason3 Jason2 Jason1 TOPEX/POSEIDON EOT20 FES2014
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机械硕士专业学位研究生“1+2+3”培养模式研究
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作者 赵建国 李久熙 +3 位作者 桑永英 李建平 李建昌 郝建军 《农机使用与维修》 2024年第7期155-158,共4页
针对当前机械硕士专业学位研究生实践能力难以满足国家高水平工程技术人才需要,以及院校与企业之间合作不够深入,共同培养研究生机制不健全等问题。该文对以学生能力培养为中心,校企联动培养为路径,学科互融、课堂贯通、双导师制为保障... 针对当前机械硕士专业学位研究生实践能力难以满足国家高水平工程技术人才需要,以及院校与企业之间合作不够深入,共同培养研究生机制不健全等问题。该文对以学生能力培养为中心,校企联动培养为路径,学科互融、课堂贯通、双导师制为保障的1个中心、2个主体、3重保障的“1+2+3”人才培养模式进行了研究。通过理论与实践、高校与企业的有机融合,增强了机械硕士专业学位研究生的实践与创新能力,提高了机械专业学生的就业率和就业质量,满足了当下企业对复合型人才的需求。 展开更多
关键词 机械 专业学位 研究生培养 “1+2+3”培养模式 复合型人才
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“3+2”联合培养模式下本科层次职业教育数学课程衔接发展研究——以安徽机电职业技术学院为例
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作者 刘苏兵 尤游 +1 位作者 吕会影 周长远 《安徽警官职业学院学报》 2024年第1期115-119,共5页
“3+2”联合培养模式是本科层次职业教育的主要模式之一,有利于提升本科教育与职业教育的课程衔接效果。以安徽机电职业技术学院为例,剖析本科层次职业教育数学课程衔接背景与课程开展现状,从目标衔接、内容衔接、教法衔接、考核评价衔... “3+2”联合培养模式是本科层次职业教育的主要模式之一,有利于提升本科教育与职业教育的课程衔接效果。以安徽机电职业技术学院为例,剖析本科层次职业教育数学课程衔接背景与课程开展现状,从目标衔接、内容衔接、教法衔接、考核评价衔接等方面,深入分析本科层次职业教育数学课程衔接发展的措施,有助于为“3+2”联合培养模式下本科与职业教育数学课程的顺利衔接提供参考。 展开更多
关键词 3+2联合培养模式 本科层次职业教育 数学课程 安徽机电职业技术学院
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纳米SiO_(2)-CaCO_(3)混凝土损伤本构模型及能量演化特征
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作者 孟琴 刘强 +1 位作者 吴茂华 张扬 《混凝土》 CAS 北大核心 2024年第1期12-16,共5页
采用纳米SiO_(2)-CaCO_(3)混合掺入混凝土中,对混掺纳米SiO_(2)-CaCO_(3)混凝土进行了受压性能试验,基于损伤力学理论和能量耗散原理分析了纳米SiO_(2)-CaCO_(3)增强混凝土的本构关系,建立了普通混凝土和纳米SiO_(2)-CaCO_(3)混凝土损... 采用纳米SiO_(2)-CaCO_(3)混合掺入混凝土中,对混掺纳米SiO_(2)-CaCO_(3)混凝土进行了受压性能试验,基于损伤力学理论和能量耗散原理分析了纳米SiO_(2)-CaCO_(3)增强混凝土的本构关系,建立了普通混凝土和纳米SiO_(2)-CaCO_(3)混凝土损伤本构模型。结果表明:混掺纳米材料比单掺纳米材料对提升混凝土强度效果更佳,强度最大增幅为31.46%;混掺纳米材料显著降低了混凝土的弹性应变能释放速率,增大了混凝土的总应变能和耗散能,从而提高了混凝土的延性和韧性。基于SEM微观测试结果揭示了纳米材料对混凝土增强效应的作用机理。 展开更多
关键词 纳米Si O2-CaCO3 混凝土 损伤本构模型 能量耗散 SEM
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NaF-Na_(3)PO_(4)-H_(2)O体系相图与热力学模型 被引量:1
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作者 常静宇 周桓 +3 位作者 杨洁 郝晴 赵鋆 李杰 《天津科技大学学报》 CAS 2024年第1期30-41,共12页
NaF–Na_(3)PO_(4)–H_(2)O体系是稀土矿物加工的典型盐水体系,开发氟、磷回收工艺需要该体系的相图和热力学模型支持。利用等温溶解平衡法测定了273.15 K、298.15 K、323.15 K和348.15 K的固液相平衡数据,并基于eNRTL模型框架构建了该... NaF–Na_(3)PO_(4)–H_(2)O体系是稀土矿物加工的典型盐水体系,开发氟、磷回收工艺需要该体系的相图和热力学模型支持。利用等温溶解平衡法测定了273.15 K、298.15 K、323.15 K和348.15 K的固液相平衡数据,并基于eNRTL模型框架构建了该体系从最低共熔点到348.15 K的热力学模型。实验结果表明:NaF–Na_(3)PO_(4)–H_(2)O体系存在NaF、Na_(3)PO_(4)·12H_(2)O、Na_(3)PO_(4)·8H_(2)O和复盐NaF·2Na_(3)PO_(4)·19H_(2)O 4个固相物种;其中复盐在各温度均占据三元体系的主要相区,磷酸钠水合物的相区极窄,很难单独成盐,NaF相区相对较大并随温度升高而增大。热力学模型研究较好地表达了NaF–H_(2)O、Na_(3)PO_(4)–H_(2)O体系的多温离子活度系数、溶液渗透系数、二元体系相图,获得了盐水作用参数和6个固相的热力学数据;通过对三元体系多温相图数据的有效表达,获得了盐-盐作用参数和复盐的热力学数据,在此基础上推测了NaF–Na_(3)PO_(4)–H_(2)O体系相图结构,获得了难以实验测定的9个零变量点和9条单变量共饱和线,从而得到了全部固相的平衡相区,并给出了NaF–Na_(3)PO_(4)–H_(2)O体系完整相图,为更复杂体系的热力学表达以及工业应用提供了参考依据。 展开更多
关键词 相平衡 相图 热力学模型 NaF–Na_(3)PO_(4)–H_(2)O
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Quantification of CO_(2) Emissions from Three Power Plants in China Using OCO-3 Satellite Measurements
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作者 Yang YANG Minqiang ZHOU +3 位作者 Wei WANG Zijun NING Feng ZHANG Pucai WANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第11期2276-2288,共13页
Coal-fired power plants are a major carbon source in China. In order to assess the evaluation of China's carbon reduction progress with the promise made on the Paris Agreement, it is crucial to monitor the carbon ... Coal-fired power plants are a major carbon source in China. In order to assess the evaluation of China's carbon reduction progress with the promise made on the Paris Agreement, it is crucial to monitor the carbon flux intensity from coal-fired power plants. Previous studies have calculated CO_(2) emissions from point sources based on Orbiting Carbon Observatory-2 and-3(OCO-2 and OCO-3) satellite measurements, but the factors affecting CO_(2) flux estimations are uncertain. In this study, we employ a Gaussian Plume Model to estimate CO_(2) emissions from three power plants in China based on OCO-3 XCO_(2) measurements. Moreover, flux uncertainties resulting from wind information, background values,satellite CO_(2) measurements, and atmospheric stability are discussed. This study highlights the CO_(2) flux uncertainty derived from the satellite measurements. Finally, satellite-based CO_(2) emission estimates are compared to bottom-up inventories.The satellite-based CO_(2) emission estimates at the Tuoketuo and Nongliushi power plants are ~30 and ~10 kt d^(-1) smaller than the Open-Data Inventory for Anthropogenic Carbon dioxide(ODIAC) respectively, but ~10 kt d^(-1) larger than the ODIAC at Baotou. 展开更多
关键词 OCO-3 power plant CO_(2)emission Gaussian Plume model
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基于“产出导向法”的高职“3+2”英语教学实践探究
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作者 田冬梅 《扬州职业大学学报》 2024年第1期54-58,共5页
高职与本科“3+2”分段培养是现代职教体系的模式之一,《大学英语教学指南(2020版)》与《高等职业教育专科英语课程标准(2021年版)》为“3+2”模式的英语教学衔接提供了理论与实践指南。基于此,以“综合英语2”的单元教学为例,按照“驱... 高职与本科“3+2”分段培养是现代职教体系的模式之一,《大学英语教学指南(2020版)》与《高等职业教育专科英语课程标准(2021年版)》为“3+2”模式的英语教学衔接提供了理论与实践指南。基于此,以“综合英语2”的单元教学为例,按照“驱动-促成-评价”的教学流程,探讨“产出导向法(POA)”在“3+2”英语教学中的可行性和有效性。 展开更多
关键词 “3+2”分段培养 产出导向法 高职英语课程标准 英语教学
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3D and 2D topographic correction to estimated geothermal gradient from the base of gas hydrate stability zone in the Andaman Forearc Basin
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作者 Uma Shankar 《Energy Geoscience》 EI 2024年第2期314-320,共7页
Methane gas hydrate related bottom-simulating reflectors(BSRs)are imaged based on the in-line and cross-line multi-channel seismic(MCS)data from the Andaman Forearc Basin.The depth of the BSR depends on pressure and t... Methane gas hydrate related bottom-simulating reflectors(BSRs)are imaged based on the in-line and cross-line multi-channel seismic(MCS)data from the Andaman Forearc Basin.The depth of the BSR depends on pressure and temperature and pore water salinity.With these assumptions,the BSR depth can be used to estimate the geothermal gradient(GTG)based on the availability of in-situ temperature measurements.This calculation is done assuming a 1D conductive model based on available in-situ temperature measurement at site NGHP-01-17 in the study area.However,in the presence of seafloor topography,the conductive temperature field in the subsurface is affected by lateral refraction of heat,which focuses heat in topographic lows and away from topographic highs.The 1D estimate of GTG in the Andaman Forearc Basin has been validated by drilling results from the NGHP-01 expedition.2D analytic modeling to estimate the effects of topography is performed earlier along selected seismic profiles in the study area.The study extended to estimate the effect of topography in 3D using a numerical model.The corrected GTG data allow us to determine GTG values free of topographic effect.The difference between the estimated GTG and values corrected for the 3D topographic effect varies up to~5℃/km.These conclude that the topographic correction is relatively small compared to other uncertainties in the 1D model and that apparent GTG determined with the 1D model captures the major features,although the correction is needed prior to interpreting subtle features of the derived GTG maps. 展开更多
关键词 Gas hydrate BSR Geothermal gradient 3D and 2D topographic modeling Andaman Forearc Basin
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Al_(2)O_(3)/HfO_(2)双钝化层微波氢终端金刚石MOSFET特性研究
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作者 陈志豪 延波 徐跃杭 《真空电子技术》 2024年第5期71-77,82,共8页
微波氢终端金刚石器件低纵横比会导致较高的关态漏极泄漏电流,从而降低器件可靠性。文章首先提出一种金属-绝缘体-半导体电容模型揭示了漏极泄漏电流的抑制机理,然后利用高介电常数(High-K)顶部钝化层(Upper Passivation Layer,UPL)对... 微波氢终端金刚石器件低纵横比会导致较高的关态漏极泄漏电流,从而降低器件可靠性。文章首先提出一种金属-绝缘体-半导体电容模型揭示了漏极泄漏电流的抑制机理,然后利用高介电常数(High-K)顶部钝化层(Upper Passivation Layer,UPL)对漏极泄漏电流进行抑制,最后制备了40/100 nm Al_(2)O_(3)/HfO_(2)双钝化层氢终端金刚石金属-氧化物-半导体场效应晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor,MOSFET)。实验结果表明,顶部钝化100 nm厚HfO_(2)后的氢终端金刚石MOSFET,在纵横比为7.5的情况下实现了约-3×10^(-7)mA/mm的漏极泄漏电流,射频特性测试表明其截止频率和最高振荡频率分别为6.1 GHz和11.1 GHz。以上结果表明,本文提出的Al_(2)O_(3)/HfO_(2)双钝化层氢终端金刚石MOSFET在高可靠和高频应用方面具有重要意义。 展开更多
关键词 氢终端金刚石 漏极泄漏电流 金属-绝缘体-半导体电容模型 Al_(2)O_(3)/HfO_(2)双钝化层
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Single-and Two-band Transport Properties Crossover in Bi_(2)Te_(3)Based Thermoelectrics
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作者 MENG Yuting WANG Xuemei +2 位作者 ZHANG Shuxian CHEN Zhiwei PEI Yanzhong 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2024年第11期1283-1291,共9页
Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)... Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)Te_(3)focus on band and microstructure engineering.However,a clear understanding of the modulation of band structure and scattering through such engineering remains still challenging,because the minority carriers compensate partially the overall transport properties for the narrow-gap Bi_(2)Te_(3)at room temperature(known as the bipolar effect).The purpose of this work is to model the transport properties near and far away from the bipolar effect region for Bi_(2)Te_(3)-based thermoelectric material by a two-band model taking contributions of both majority and minority carriers into account.This is endowed by shifting the Fermi level from the conduction band to the valence band during the modeling.A large amount of data of Bi_(2)Te_(3)-based materials is collected from various studies for the comparison between experimental and predicted properties.The fundamental parameters,such as the density of states effective masses and deformation potential coefficients,of Bi_(2)Te_(3)-based materials are quantified.The analysis can help find out the impact factors(e.g.the mobility ratio between conduction and valence bands)for the improvement of thermoelectric properties for Bi_(2)Te_(3)-based alloys.This work provides a convenient tool for analyzing and predicting the transport performance even in the presence of bipolar effect,which can facilitate the development of the narrow-gap thermoelectric semiconductors. 展开更多
关键词 thermoelectric material Bi_(2)Te_(3)-based alloy two-band model narrow-gap thermoelectric semiconductor
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基于高质量发展的“3+2”人才培养问题分析
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作者 田从 《辽宁高职学报》 2024年第8期11-15,82,共6页
通过中高职衔接培养方式,拓宽职业教育学生发展通道,是新时代职业教育高质量发展的核心方向之一。本文首先概述了中高职衔接“3+2”人才培养模式的提出及发展历程;其次结合经济社会高质量发展对职业教育提出的新要求、新作为进行了梳理... 通过中高职衔接培养方式,拓宽职业教育学生发展通道,是新时代职业教育高质量发展的核心方向之一。本文首先概述了中高职衔接“3+2”人才培养模式的提出及发展历程;其次结合经济社会高质量发展对职业教育提出的新要求、新作为进行了梳理分析;再次针对中高职衔接试点项目,从宏观设计和北京、沈阳两市具体实施现状进行概述;最后指出中高职衔接培养中存在的问题,进而为促进中高职协调发展、提升衔接培养人才质量提出相关对策,奠定基础。 展开更多
关键词 高质量发展 “3+2”人才培养 问题分析
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Numerical Models and Methods of Atmospheric Parameters Originating in the Formation of the Earth’s Climatic Cycle
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作者 Wend Dolean Arsène Ilboudo Kassoum Yamba +1 位作者 Windé Nongué Daniel Koumbem Issaka Ouédraogo 《Atmospheric and Climate Sciences》 2024年第2期277-286,共10页
Atmospheric models are physical equations based on the ideal gas law. Applied to the atmosphere, this law yields equations for water, vapor (gas), ice, air, humidity, dryness, fire, and heat, thus defining the model o... Atmospheric models are physical equations based on the ideal gas law. Applied to the atmosphere, this law yields equations for water, vapor (gas), ice, air, humidity, dryness, fire, and heat, thus defining the model of key atmospheric parameters. The distribution of these parameters across the entire planet Earth is the origin of the formation of the climatic cycle, which is a normal climatic variation. To do this, the Earth is divided into eight (8) parts according to the number of key parameters to be defined in a physical representation of the model. Following this distribution, numerical models calculate the constants for the formation of water, vapor, ice, dryness, thermal energy (fire), heat, air, and humidity. These models vary in complexity depending on the indirect trigonometric direction and simplicity in the sum of neighboring models. Note that the constants obtained from the equations yield 275.156˚K (2.006˚C) for water, 273.1596˚K (0.00963˚C) for vapor, 273.1633˚K (0.0133˚C) for ice, 0.00365 in/s for atmospheric dryness, 1.996 in<sup>2</sup>/s for humidity, 2.993 in<sup>2</sup>/s for air, 1 J for thermal energy of fire, and 0.9963 J for heat. In summary, this study aims to define the main parameters and natural phenomena contributing to the modification of planetary climate. . 展开更多
关键词 Atmospheric Parameter 1 Climatic Cycle 2 Numerical models 3
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基于OCO-2/3卫星的中国超大型燃煤电厂CO_(2)排放量的遥感反演
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作者 郭文月 石玉胜 《中国科学院大学学报(中英文)》 CAS CSCD 北大核心 2024年第4期490-502,共13页
基于轨道碳观测者2/3(OCO-2/3)卫星数据和高斯羽流模型对发电厂CO_(2)排放量进行遥感反演。首先基于OCO-2(2014-09-06—2021-10-01)和OCO-3(2019-08-06—2021-10-01)数据检索中国超大型燃煤电厂(≥5000 MW)附近图像,共在托克托、嘉兴、... 基于轨道碳观测者2/3(OCO-2/3)卫星数据和高斯羽流模型对发电厂CO_(2)排放量进行遥感反演。首先基于OCO-2(2014-09-06—2021-10-01)和OCO-3(2019-08-06—2021-10-01)数据检索中国超大型燃煤电厂(≥5000 MW)附近图像,共在托克托、嘉兴、外高桥电厂附近识别到7个CO_(2)羽流。综合利用3种大气背景值确定方法,经过高斯羽流模型估算的CO_(2)排放量范围为43~77 kt/d,模型拟合的相关系数0.50~0.87。单个羽流的不确定性变化为8%~32%(1σ),风速是最大的不确定性(6%~31%),其次是背景值(5%~18%)、增强值(1%~21%)和羽流上升(1%~8%)。经验证,估算结果与碳监测行动、碳简报、全球电厂排放数据库等排放清单一致性较高(托克托:(76.48±15.75)kt/d、外高桥:(55.98±6.90)kt/d、嘉兴:(64.55±15.89)kt/d)。这项研究有助于监测点源碳排放,这不仅是电力行业开展碳减排的前提,也有助于针对性制定区域碳减排政策,从而减少人为碳排放。 展开更多
关键词 二氧化碳 高斯羽流模型 轨道碳观测者2 轨道碳观测者3 超大型燃煤电厂
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ISB参数估计在BDS-2/BDS-3单点定位应用中的分析
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作者 于海霞 《经纬天地》 2024年第3期11-15,共5页
BDS-2和BDS-3之间存在的系统间偏差是影响其组合定位性能的重要因素,基于多个MGEX跟踪站数据,分析了随机游走ISB模型在BDS-2/BDS-3伪距单点定位与精密单点定位中的应用。实验结果表明:是否估计ISB对BDS-2/BDS-3 B1I和B3I单频伪距单点定... BDS-2和BDS-3之间存在的系统间偏差是影响其组合定位性能的重要因素,基于多个MGEX跟踪站数据,分析了随机游走ISB模型在BDS-2/BDS-3伪距单点定位与精密单点定位中的应用。实验结果表明:是否估计ISB对BDS-2/BDS-3 B1I和B3I单频伪距单点定位精度影响较小,最大影响量不到5%;是否估计ISB对BDS-2/BDS-3 B1I/B3I双频静态与动态精密单点定位精度影响较大;估计ISB相比未估计ISB在E、N、U 3个方向精度的提升量均在14%以上,其中E方向定位精度提升效果最为明显,静态精密单点定位最大提升量达到了44.9%。 展开更多
关键词 系统间偏差 BDS-2/BDS-3 ISB模型 定位精度
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基于维生素K2、IGFBP-3、Omentin-1构建特发性矮小症儿童疗效预测模型的研究
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作者 吴红波 吕魏峰 《国际检验医学杂志》 CAS 2024年第1期34-38,43,共6页
目的探讨维生素K_(2)、胰岛素样生长因子结合蛋白3(IGFBP-3)、网膜素(Omentin-1)与特发性矮小症(ISS)儿童疗效的关系,并以此构建预测模型。方法选取2019-2021年济南市第二妇幼保健院收治的242例ISS儿童,均接受重组人生长激素(rhGH)治疗... 目的探讨维生素K_(2)、胰岛素样生长因子结合蛋白3(IGFBP-3)、网膜素(Omentin-1)与特发性矮小症(ISS)儿童疗效的关系,并以此构建预测模型。方法选取2019-2021年济南市第二妇幼保健院收治的242例ISS儿童,均接受重组人生长激素(rhGH)治疗,根据治疗12个月后的疗效分为有效组和无效组。统计两组一般资料及维生素K2、IGFBP-3、Omentin-1水平,采用Logistic回归模型、决策树模型分析ISS儿童治疗疗效的影响因素,采用受试者工作特征(ROC)曲线分析两种模型预测效能。结果两组25-羟维生素D[25(OH)D]、甲状旁腺激素(PTH)、促甲状腺激素(TSH)、维生素K2、IGFBP-3、Omentin-1、rhGH剂量、每周户外运动时间比较,差异有统计学意义(P<0.05);PTH(OR=7.011,95%CI:2.456~20.014)、维生素K2(OR=0.605,95%CI:0.465~0.788)、IGFBP-3(OR=0.458,95%CI:0.321~0.654)、Omentin-1(OR=0.514,95%CI:0.389~0.679)、rhGH剂量(OR=0.563,95%CI:0.445~0.712)是ISS儿童治疗无效的影响因素(P<0.05);决策树模型显示,维生素K2、IGFBP-3、Omentin-1是ISS治疗疗效的影响因素,其中IGFBP-3的影响最为显著;ROC曲线结果显示,决策树模型、Logistic回归模型对预测ISS治疗无效的曲线下面积分别为0.922、0.908,模型分类效果均良好。结论ISS儿童的治疗疗效受维生素K2、IGFBP-3、Omentin-1等因素影响,且IGFBP-3影响最为显著,Logistic回归模型、决策树模型可互为补充,从不同方面为改善ISS儿童治疗疗效提供参考。 展开更多
关键词 特发性矮小症 维生素K2 胰岛素样生长因子结合蛋白3 网膜素 决策树 Logistic回归模型
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血清CHI3L1水平与2型糖尿病合并代谢相关脂肪性肝病患者的相关性分析
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作者 杨静 王艳娇 《转化医学杂志》 2024年第3期388-391,共4页
目的 探讨血清壳多糖酶3样蛋白1(CHI3L1)水平与2型糖尿病(T2DM)患者合并代谢相关脂肪性肝病(MAFLD)的关系。方法 按照1∶1比例选取2020年1月至2023年12月河北省唐山南湖医院收治的T2DM合合并MAFLD患者(MAFLD组)和未合并MAFLD的T2DM患者(... 目的 探讨血清壳多糖酶3样蛋白1(CHI3L1)水平与2型糖尿病(T2DM)患者合并代谢相关脂肪性肝病(MAFLD)的关系。方法 按照1∶1比例选取2020年1月至2023年12月河北省唐山南湖医院收治的T2DM合合并MAFLD患者(MAFLD组)和未合并MAFLD的T2DM患者(非MAFLD组)各120例,采用酶联免疫吸附法检测2组患者血清CHI3L1水平,并收集2组患者基线资料。采用多因素条件Logistic回归模型分析CHI3L1与T2DM患者合并MAFLD的关系,绘制受试者工作特征(ROC)曲线,分析CHI3L1对T2DM合并MAFLD的预测价值。结果 与非MAFLD组比较,MAFLD组血清CHI3L1水平升高(P <0.05)。调整混杂因素后,CHI3L1升高为T2DM患者合并MAFLD的独立危险因素(P <0.05)。血清CHI3L1水平预测T2DM患者合并MAFLD的曲线下面积(AUC)为0.803,敏感度为70.83%,特异度为88.33%。结论 T2DM患者血清CHI3L1水平升高是合并MAFLD的独立危险因素,并对T2DM患者合并MAFLD具有一定的预测价值。 展开更多
关键词 糖尿病 2 代谢相关脂肪性肝病 壳多糖酶3样蛋白1 Logistic模型 ROC曲线 曲线下面积
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A thermochemical model description of CaO_(2)-SiO2-Al_(2)O_(3) silicate system
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作者 Qiu-lin Wen Feng-man Shen +3 位作者 Hai-yan Zheng Yun-bao Gao Yu Wang Yan-chun Lou 《China Foundry》 SCIE EI CAS CSCD 2023年第6期480-490,共11页
A thermochemical model based on the ion and molecule coexistence theory(IMCT)was developed to calculate thermodynamic data in the CaO-SiO_(2)-Al_(2)O_(3) slag system,considering the influential role of oxide activitie... A thermochemical model based on the ion and molecule coexistence theory(IMCT)was developed to calculate thermodynamic data in the CaO-SiO_(2)-Al_(2)O_(3) slag system,considering the influential role of oxide activities on the thermodynamic properties of slags.Using this model,iso-activity contours were obtained for oxide components CaO,SiO_(2) and Al2O3 in this system at temperatures of 1,873 K and 1,773 K.When compared with the IMCT model,it is found that the predicted activities of oxide components in the CaO-SiO_(2)-Al_(2)O_(3) system using the model developed in this study better matches experimental data from literature in terms of both trend and numerical value.Therefore,the model developed in this study can serve as a robust modeling tool for metallurgical processes,and the thermodynamic data predicted by this new model can be used to improve the metallurgical technology. 展开更多
关键词 thermochemical model CaO-SiO_(2)-Al_(2)O_(3)slag system thermodynamic properties molecule coexistence theory
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Underwater Recording and 3D Modeling during a Dive Training Course: A Case Study at Panormos, Skopelos, Greece
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作者 Kimon Papadimitriou Anastasios Ktistis Ioanna Sarakinou 《Journal of Environmental Science and Engineering(A)》 2015年第9期445-454,共10页
In the field of underwater survey, there is a variety of methods which differ from each other in terms of the operating environment and the purpose that each method is used. Hence, some of the state-of-the-art methods... In the field of underwater survey, there is a variety of methods which differ from each other in terms of the operating environment and the purpose that each method is used. Hence, some of the state-of-the-art methods, that have many applications in the various scientific fields nowadays, are introduced in this paper. Additionally, the application of the procedures for an underwater survey in shallow depths is analyzed in accordance with the training standards of the PADI Underwater Survey Diver distinctive specialty. The main goal is to demonstrate not only the theoretical background of underwater surveys but also their operational issues, in order to facilitate the development of knowledge and skills during a training course. Finally, a case study for the recording and 3D modeling of the seabeds' morphology in shallow water is presented as it has been organized and accomplished by the participants of such a training course. By this way, it is expected that the reader will understand explicitly the application of the procedures prior, during and after the dive for an underwater survey in shallow depths. 展开更多
关键词 Underwater survey training course PHOTOGRAMMETRY 3D modeling.
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A Modified Lattice Model of the Reversible Effect of Axial Strain on the Critical Current of Polycrystalline REBa2Cu3O7-δ Films
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作者 苟晓凡 朱光 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第3期128-132,共5页
The strain effect on the critical current is one of the most important properties for polycrystalline YBa2 Cu3O7-δ (REBCO, RE: rare earth) films, in which the reversible effect is intrinsic in the range of strain ... The strain effect on the critical current is one of the most important properties for polycrystalline YBa2 Cu3O7-δ (REBCO, RE: rare earth) films, in which the reversible effect is intrinsic in the range of strain 0 and the irreversible strain εirr. By introducing the applied strain, a modified grain boundaries (GBs) in the REBCO film is developed. lattice model combining the strain and misorientation of A good agreement of the calculation on the lattice model with the experimental data shows that the lattice model is able to well describe the reversible effect of axial strain on the critical current of the REBCO film, and provides a good understanding of the mechanism of the reversible effect of the strain. Moreover, the effects of the crystallographic texture of the REBCO film and the residual strain εr on the variation of the critical current with the applied strain are extensively investigated. Furthermore by using the developed lattice model, the irreversible strain εirr of the REBCO film can be theoretically determined by comparing the calculation of the critical current-strain curve with the experimental data. 展开更多
关键词 REBCO A Modified Lattice model of the Reversible Effect of Axial Strain on the Critical Current of Polycrystalline REBa2Cu3O FILMS Cu
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环境艺术设计专业职业教育人才培养模式探索--以“3+2”分段培养本科层次为例 被引量:1
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作者 宋晓梅 刘敏 《教育教学论坛》 2023年第45期121-124,共4页
通过研究从环境艺术设计专业“3+2”分段培养的人才培养现状,明确人才培养目标,探索“343”人才培养模式,提出了在建设过程中提升环境艺术设计专业人才培养质量的路径:重塑人才培养定位,体现职业本科特色;注重课程体系设计的衔接,做好... 通过研究从环境艺术设计专业“3+2”分段培养的人才培养现状,明确人才培养目标,探索“343”人才培养模式,提出了在建设过程中提升环境艺术设计专业人才培养质量的路径:重塑人才培养定位,体现职业本科特色;注重课程体系设计的衔接,做好专本协同发展;进一步发挥“岗课赛证”办学特色,体现环境艺术设计专业的职业能力;重视能力培养,建立多元化的考核与评估机制,以期对现阶段本科层次职业教育的发展提供借鉴。 展开更多
关键词 “3+2”分段培养 职业本科 环境艺术设计 人才培养模式
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