期刊文献+
共找到233篇文章
< 1 2 12 >
每页显示 20 50 100
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
1
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
下载PDF
Numerical Models and Methods of Atmospheric Parameters Originating in the Formation of the Earth’s Climatic Cycle
2
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
下载PDF
医学院校思政课“1+3+N”教学实践探析
3
作者 张国军 杨淑敏 《卫生职业教育》 2024年第19期55-59,共5页
“1+3+N”教学模式围绕医学院校特色、医学专业和医学生特点,基于移动互联技术,坚持以学生为中心,有机融合网络教学、课堂教学和实践教学3种集中教学形式,辅以N种分散教学形式,实现思政课与医学生医学梦的同频共振。学生通过网络课堂预... “1+3+N”教学模式围绕医学院校特色、医学专业和医学生特点,基于移动互联技术,坚持以学生为中心,有机融合网络教学、课堂教学和实践教学3种集中教学形式,辅以N种分散教学形式,实现思政课与医学生医学梦的同频共振。学生通过网络课堂预习基本知识点,教师在课堂教学中着重讲解重难点并解答学生预习遇到的问题,学生通过实践教学把所学理论知识内化于心、外化于行。小班讨论等N种分散教学形式旨在培养学生听、读、看、写、讲、行能力。“1+3+N”教学模式弥补了传统灌输式授课方式的短板,调动了医学生学习思政课的积极性和主动性。影响该教学模式实践效果的因素包括学校网络教学基础设施和信息化教学设备情况、师生相关技术掌握情况、网络教学管理情况、网络教学和课堂教学衔接情况、实践教学组织实施情况等,针对这些影响因素,采取相应优化策略,以提升教学效果。 展开更多
关键词 医学院校 思政课 1+3+N”教学模式
下载PDF
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 被引量:1
4
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
下载PDF
Establishment of Xenotransplantation Model of Human CN-AML with FLT3-ITD^(mut)/NPM1 in NOD/SCID Mice 被引量:3
5
作者 商臻 王珏 +5 位作者 王迪 肖敏 李童娟 王娜 黄亮 周剑峰 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2013年第3期329-334,共6页
Summary: Patients with FLT3-ITD^mmutt/NPM1- cytogenetically normal acute myeloid leukemia (CN-AML), as high-risk molecular group in CN-AML, are associated with a worse prognosis than other CN-AML patients. It is be... Summary: Patients with FLT3-ITD^mmutt/NPM1- cytogenetically normal acute myeloid leukemia (CN-AML), as high-risk molecular group in CN-AML, are associated with a worse prognosis than other CN-AML patients. It is beneficial to generate xenotransplantation model of FLT3-ITD^mut/NPM1- CN-AML to better understand the pathogenesis and therapeutic strategies of such AML subtype. The purpose of present study was to establish the xenotransplantation model in NOD/SCID mice with FLT3-ITD^mut/NPM1- CN-AML primary cells. The FLT3-ITD^mut/NPM1- CN-AML primary cells from 3 of 7 cases were successfully transplanted into NOD/SCID mice, and human CD45 positive cells were detected in the peripheral blood, spleen and bone marrow of mice by using flow cytometry. Infiltration of human leukemia cells in various organs of mice was observed by using immunohistochemistry. Gene analysis confirmed sustained FLT3/ITD mutation without NPM1 mutation in mice. By performing serial transplantation, it was found that characteristics of the leukemia cells in secondary and tertiary genera- tion models remained unchanged. Moreover, in vivo cytarabine administration could extend survival of NOD/SCID mice, which was consistent with clinical observation. In conclusion, we successfully estab- lished xenotransplantation model of human FLT3-ITD^mut/NPM1- CN-AML in NOD/SCID mice. The model was able to present primary disease and suitable to evaluate the curative effects of new drugs or therapy strategies. 展开更多
关键词 acute myeloid leukemia FLT3/ITD mutation NPM1 mutation xenotransplantation model NOD/SCID mice
下载PDF
Increased expression and possible role of chitinase 3-like-1 in a colitis-associated carcinoma model 被引量:2
6
作者 Jia-Yi Ma Run-Hua Li +3 位作者 Kun Huang Gao Tan Chen Li Fa-Chao Zhi 《World Journal of Gastroenterology》 SCIE CAS 2014年第42期15736-15744,共9页
AIM: To investigate the possible role of chitinase 3-like-1 (CHI3L1) in the progression of colitis-associated carcinoma (CAC).
关键词 Inflammatory bowel disease Ulcerative colitis Colitis-associated carcinoma Murine model Chitinase 3-like-1 Oxidative stress Colorectal cancer
下载PDF
Empirical Study on the Benefit Increase of New Contract Farming 1+3+X Model 被引量:1
7
作者 Jiaohu YANG Zhong CHENG +1 位作者 Hao ZHOU Peter ZHANG 《Asian Agricultural Research》 2020年第4期7-13,33,共8页
For a long time,the development model of traditional rice planting industry has been single,linear,and focusing on production first and then market.However,with the low price of rice,such problems as slow technologica... For a long time,the development model of traditional rice planting industry has been single,linear,and focusing on production first and then market.However,with the low price of rice,such problems as slow technological upgrading,meager profits,and unstable rice quality in the primary industry planting units and farmers have become increasingly prominent.The integration and development of the rural primary,secondary,and tertiary industries and industrial integration have the same root.They are integrated industrial development based on technological or model innovation,vertical and horizontal integration.Three agricultural leading companies(Nanjing Tianwei Agricultural Technology Co.,Ltd.,Nanjing CHYKINGYOUNG Biological Technology Co.,Ltd.,and Jiangsu Jingshan Eco-organic Agriculture Co.,Ltd.)established an industrialization complex,and used their respective technical,operational,and market advantages to integrate and form a rice contract farming 1+3+X model.This model effectively integrates scattered rice planting,rice processing,and rice sales in Nanjing City of Jiangsu Province,and Chuzhou City of Anhui Province,and unifies planting regulations and supply of production materials,safeguards the supply of green and high-quality rice and realizes high quality and high price.In addition,it integrates farmers into the entire industrial chain of contract farming,summons up the production enthusiasm of farmers and greatly increases their income from planting production. 展开更多
关键词 Integration of primary secondary and TERTIARY industries Contract FARMING Green and high quality Benefit INCREASE from multiple dimensions 1+3+X model Rice PLANTING Menghu Intelligent
下载PDF
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
8
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型 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
下载PDF
An Improved and Efficient Preparation of the Chiral NAD(P)H Model (S_s)-1-Benzy1-3-(p-tolylsulfinyl)-1,4-dihydropyridine
9
作者 Jing LI, You Cheng LIU, Jin Gen DENG (Department of Chemistry. University of Science and Technology of China, Hefei 230026 Chengdu Institute of Organic Chemistry. Chinese Academy of Sciences. Chengdu 610041 National Laboratory of Applied Organic Chemis 《Chinese Chemical Letters》 SCIE CAS CSCD 2000年第3期209-212,共4页
An improved procedure for the preparation of China, BAD(P)H model. (S_s)- 1 -benzyl-3- (p-tolylsulfinyl)-1.4-dihydropyridine with satisfactary chemical yield and excellent enantiopurity is reported.
关键词 Chiral NAD(P)H models (S_s )-1-benzyl-3-(p-tolylsulfinyl)-1 4-dihydropyridine.
下载PDF
Lie symmetry analysis and invariant solutions for the(3+1)-dimensional Virasoro integrable model
10
作者 胡恒春 李雅琦 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期249-254,共6页
Lie symmetry analysis is applied to a(3+1)-dimensional Virasoro integrable model and the corresponding similarity reduction equations are obtained with the different infinitesimal generators.Invariant solutions with a... Lie symmetry analysis is applied to a(3+1)-dimensional Virasoro integrable model and the corresponding similarity reduction equations are obtained with the different infinitesimal generators.Invariant solutions with arbitrary functions for the(3+1)-dimensional Virasoro integrable model,including the interaction solution between a kink and a soliton,the lump-type solution and periodic solutions,have been studied analytically and graphically. 展开更多
关键词 (3+1)-dimensional Virasoro integrable model Lie symmetry invariant solutions
下载PDF
Molecular Characterization, 3D Modeling of Grass Carp Interleukin-10 Receptor 1 (IL10R1)
11
作者 He Wei Shangnian Wang +2 位作者 Lei Qin Xinyan Wang Hong Zhou 《Engineering(科研)》 2013年第10期214-219,共6页
Interleukin-10 (IL-10) is an important cytokine that plays a pivotal role in natural and adaptive immune systems. However, in lower vertebrates, especially in teleost the receptor of this cytokine is still largely unk... Interleukin-10 (IL-10) is an important cytokine that plays a pivotal role in natural and adaptive immune systems. However, in lower vertebrates, especially in teleost the receptor of this cytokine is still largely unknown. This paper described the cloning and characterization of grass carp interleukin-10 receptor 1 (gcIL10R1) and the 3D structure of its extracellular domain was predicted. The gcIL10R1 cDNA included 180 bp5’ untranslated region (UTR), 870 bp3’ UTR and an open reading frame (ORF) of 1632 bp. The ORF was found to encode a 543 amino acid protein with a putative JAK1 binding site, one STAT3 binding site. The phylogenetic analysis clusters gcIL10R1 with other teleost IL10R1s but independently of the amphibian, avian and mammalian IL10R1s. The 3D structure of its extracellular domain was the first homology model of a fish IL10R1 that revealed a high similarity with its mammalian and avian counterparts. 展开更多
关键词 GRASS CARP INTERLEUKIN-10 RECEPTOR 1 Structure Characterization 3D modeling
下载PDF
Application of 3D Reservoir Geological Model on Es1 Formation, Block Nv32, Shenvsi Oilfield, China
12
作者 Ayman Al Rassas Shaoran Ren +5 位作者 Renyuan Sun Atif Zafar Safea Moharam Zhenliang Guan Alalimi Ahmed Mohammed Alomaisi 《Open Journal of Yangtze Oil and Gas》 2020年第2期54-72,共19页
Three-dimensional geological modeling of reservoirs is an essential tool to predict reservoir performance and improve the understanding of reservoir uniqueness in Es1 formation. The paper focuses on the use of petrel ... Three-dimensional geological modeling of reservoirs is an essential tool to predict reservoir performance and improve the understanding of reservoir uniqueness in Es1 formation. The paper focuses on the use of petrel software to build three-dimensional reservoir geological model which characterizes and assesses block Nv32 that located in the west of the Shenvsi oilfield in the south of Cangzhou city, Hebei province of China, and has an oil-bearing area of 1.4 km<sup>2</sup>. This study is depending on integration data from well logs of 22 wells which provided from geology, geophysics, and petrophysics to identify and provide precise depict of the subsurface internal structure and the reservoir heterogeneity. Input data was used to build the structural model, sedimentary facies model, petrophysical properties (porosity, permeability, saturation, and N/G model, and finally to determine the reservoir volume. The lithological facies were simulated using the assigned value method. Moreover, Petrophysical properties (Porosity, permeability, oil saturation and net to gross) were constructed for each zone using the Sequential Gaussian Simulation method to guide the distribution of petrophysical properties of Es1 formation, block Nv32. Statistical analysis of the porosity, permeability, oil saturation and N/G model present that the porosity occurrence distribution is mainly concern between 0.2% - 36.39% of block Nv32 with an average porosity value of 17.5%, permeability between 0.017 mD to 974.8 mD, having an average permeability of 59.44 mD, oil saturation between 0.00 to 0.95 having an average value of 0.22, and N/G is mainly concentrated between 0.01 to 1.00 within an average value of 0.61. This research has indicated the reliability of the three-dimensional model technique as a suitable tool to provide a sufficient understanding of petrophysical distribution. The south-western and north-western indicate that oilfield is very promising an exploratory well should be drilled to find out the thickness and size of the reservoir. 展开更多
关键词 3D Reservoir Geological model Es1 Formation Block Nv32 Structural model Petrophysical model
下载PDF
Temperature Distributions in Single Cell of Polymer Electrolyte Fuel Cell Simulated by an 1D Multi-plate Heat-Transfer Model and a 3D Numerical Simulation Model
13
作者 Akira Nishimura Masashi Baba +3 位作者 Kotaro Osada Takenori Fukuoka MasafumiHirota Eric Hu 《Journal of Energy and Power Engineering》 2015年第8期687-704,共18页
The purpose of this study is to verify an 1D multi-plate heat-transfer model estimating the temperature distribution on the interface between polymer electrolyte membrane and catalyst layer at cathode in single cell o... The purpose of this study is to verify an 1D multi-plate heat-transfer model estimating the temperature distribution on the interface between polymer electrolyte membrane and catalyst layer at cathode in single cell of polymer electrolyte fuel cell, which is named as reaction surface in this study, with a 3D numerical simulation model solving many governing equations on the coupling phenomena in the cell. The results from both models/simulations agreed well. The effects of initial operation temperature, flow rate, and relative humidity of supply gas on temperature distribution on the reaction surface were also investigated. It was found in both 1D and 3D simulations that, the temperature rise (i.e., Treact-Tini) of the reaction surface from initial operation temperature at 70℃ was higher than that at 80℃ irrespective of flow rate of supply gas. The effect of relative humidity of supply gas on Treact- Tini near the inlet of the cell was small. Compared to the previous studies conducted under the similar operation conditions, the Treact - Tini calculated by 1D multi-plate heat-transfer model in this study as well as numerical simulation using 3D model was reasonable. 展开更多
关键词 Polymer electrolyte fuel cell 1D multi-plate heat-transfer model 3D numerical simulation model temperaturedistribution.
下载PDF
“3+1”应用型人才培养模式的研究与探索 被引量:36
14
作者 王晓煜 吴迪 +1 位作者 宋萍 蒋晶晶 《计算机教育》 2010年第4期15-19,共5页
"3+1"人才培养模式是目前高校培养应用型人才的成功模式。建立基于校企合作的"3+1"人才培养,是高校发展的必然趋势,本文将以信息管理与信息系统专业为例从"3+1"的教学体系、双师型师资队伍、先进的教学... "3+1"人才培养模式是目前高校培养应用型人才的成功模式。建立基于校企合作的"3+1"人才培养,是高校发展的必然趋势,本文将以信息管理与信息系统专业为例从"3+1"的教学体系、双师型师资队伍、先进的教学方法及手段、多元化的校企合作模式等方面研究"3+1"应用型人才培养模式。 展开更多
关键词 3+1”人才培养模式 校企合作 教学体系
下载PDF
甘油与氯化钠模型热反应中生成3-氯-1,2-丙二醇的研究 被引量:5
15
作者 张岱 孙培培 +2 位作者 黄明泉 孙宝国 邹青青 《食品工业科技》 CAS CSCD 北大核心 2013年第9期74-78,共5页
以甘油、氯化钠、水为原料建立热反应模型,结合气相色谱-质谱法(gas chromatography-mass spectrometry,GC-MS)分析,对其生成的3-氯-1,2-丙二醇(3-MCPD)进行了研究。通过正交实验,考察了反应时间、温度和各原料用量对3-MCPD生成量的影响... 以甘油、氯化钠、水为原料建立热反应模型,结合气相色谱-质谱法(gas chromatography-mass spectrometry,GC-MS)分析,对其生成的3-氯-1,2-丙二醇(3-MCPD)进行了研究。通过正交实验,考察了反应时间、温度和各原料用量对3-MCPD生成量的影响,同时研究了在热反应模型中分别加入不同种类单糖和氨基酸后3-MCPD生成量的变化规律,并对其反应机理进行了探讨。结果表明,反应时间2h、反应温度140℃、甘油用量0.05g(占原料总量0.31%)、NaCl用量1.0g(6.23%)、水用量15g(93.46%),3-MCPD生成量最少;葡萄糖、果糖、木糖、甘露糖、半乳糖、缬氨酸、精氨酸、赖氨酸、丝氨酸、亮氨酸、苯丙氨酸、苏氨酸、组氨酸使3-MCPD的生成量减少;谷氨酸、蛋氨酸、丙氨酸、天冬氨酸、甘氨酸使3-MCPD的生成量增加;半胱氨酸、酪氨酸、脯氨酸、色氨酸对3-MCPD的生成无明显作用。 展开更多
关键词 模型热反应 甘油 3-氯-1 2-丙二醇(3-MCPD) 单糖 氨基酸
下载PDF
乙酸乙酯-乙腈-1-乙基-3-甲基咪唑三氟甲磺酸盐物系等压汽液平衡数据的测定 被引量:6
16
作者 丁邦琴 张双 +3 位作者 李卓 曹玲 许文 李群生 《石油化工》 CAS CSCD 北大核心 2014年第12期1405-1409,共5页
在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二... 在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二组分物系汽液平衡线发生偏离,[emim]OTf含量越高,偏离程度越大;[emim]OTf具有明显的盐析效应,当[emim]·OTf的含量达到5%(x)时,就可消除乙酸乙酯-乙腈物系的共沸点;[emim]OTf可作为乙酸乙酯-乙腈萃取精馏的萃取剂。 展开更多
关键词 汽液平衡 乙酸乙酯 乙腈 1-乙基-3-甲基咪唑三氟甲磺酸盐 NRTL方程
下载PDF
伤科消炎膏对木瓜蛋白酶诱导兔膝骨关节炎模型滑膜中白介素-1、白三烯、金属蛋白酶-3的影响 被引量:4
17
作者 孙鲁宁 黄桂成 +2 位作者 赵燕华 夏建龙 诸方受 《辽宁中医药大学学报》 CAS 2012年第9期143-145,共3页
背景:伤科消炎膏能够缓解膝关节骨性关节炎患者膝关节滑膜炎症,显著改善膝关节肿胀和疼痛,但对于其作用机制目前尚缺乏研究。作者通过动物实验观察其对膝关节滑膜中白介素-1(IL-1)、白三烯(LT)、金属蛋白酶-3(MMP-3)浓度的影响以期初步... 背景:伤科消炎膏能够缓解膝关节骨性关节炎患者膝关节滑膜炎症,显著改善膝关节肿胀和疼痛,但对于其作用机制目前尚缺乏研究。作者通过动物实验观察其对膝关节滑膜中白介素-1(IL-1)、白三烯(LT)、金属蛋白酶-3(MMP-3)浓度的影响以期初步探讨其作用机制。目的:观察伤科消炎膏对木瓜蛋白酶诱导兔膝骨关节炎性模型的膝关节滑膜中IL-1、LT、MMP-3浓度的影响。方法:通过木瓜蛋白酶关节腔内注射建立18个兔右膝骨关节炎性模型,然后将其随机分为空白组、伤科消炎膏组和双氯芬酸二乙胺组,每组6只。空白组不进行治疗,伤科消炎膏组外用伤科消炎膏治疗、双氯芬酸二乙胺组外用双氯芬酸二乙胺治疗。于治疗后第11天用ELISA法检测试验动物右膝关节滑膜组织中IL-1、LT、MMP-3的浓度。结果与结论:空白组滑膜IL-1浓度高于伤科消炎膏组(P<0.05),空白组滑膜LT浓度高于双氯芬酸二乙胺组(P<0.05),各组间滑膜MMP-3浓度差异无显著性。本研究结果提示伤科消炎膏系通过降低滑膜组织中部分与炎性反应相关的细胞因子水平来缓解膝关节骨性关节炎的滑膜组织炎性反应,其作用机制与双氯芬酸二乙胺类似,但作用途径与双氯芬酸二乙胺相比有所不同。伤科消炎膏对炎性滑膜组织细胞因子中的IL-1具有影响,而双氯芬酸二乙胺对炎性滑膜组织细胞因子中的LT具有影响。但实验结果未显示伤科消炎膏对于滑膜MMP-3浓度有降低作用,说明该药物在抑制滑膜组织胶原降解方面作用不显著。 展开更多
关键词 滑膜炎 骨关节炎 动物模型 中药疗法 白介素-1 白三烯 金属蛋白酶-3
下载PDF
1-苄基-4-羟甲基-1H-1,2,3-三氮唑溶解度的测定及关联 被引量:6
18
作者 沈乐 李惠萍 +1 位作者 高江涛 李焕新 《高校化学工程学报》 EI CAS CSCD 北大核心 2016年第1期1-6,共6页
设计并组装了用动态法测定固体在液体中溶解度的试验装置,采用激光监视技术常压下测定281.15-315.75 K下1-苄基-4-羟甲基-1H-1,2,3-三氮唑在甲苯、四氢呋喃、丙酮、乙酸乙酯、三氯甲烷、二氯甲烷中的溶解度数据。实验数据表明,1-苄基-4... 设计并组装了用动态法测定固体在液体中溶解度的试验装置,采用激光监视技术常压下测定281.15-315.75 K下1-苄基-4-羟甲基-1H-1,2,3-三氮唑在甲苯、四氢呋喃、丙酮、乙酸乙酯、三氯甲烷、二氯甲烷中的溶解度数据。实验数据表明,1-苄基-4-羟甲基-1H-1,2,3-三氮唑在六种溶剂中的溶解度均随温度的升高而增大,且在不同溶剂中存在较大差异。采用van’t Hoff方程、Apelblat方程以及λh方程关联了溶解度数据,所得平均相对偏差分别为1.23%、1.11%、1.00%,结果表明,van’t Hoff方程、Apelblat方程和λh方程在所研究的温度范围内都是适用的,且λh方程要优于van’t Hoff方程和Apelblat方程。上述结果可为1-苄基-4-羟甲基-1H-1,2,3-三氮唑的萃取及结晶过程中溶剂的选择提供基础数据。 展开更多
关键词 溶解度 1-苄基-4-羟甲基-1H-1 2 3-三氮唑 溶解度模型 激光监测技术
下载PDF
有限元法分析1-3型压电复合材料换能器 被引量:5
19
作者 李莉 王丽坤 秦雷 《压电与声光》 CSCD 北大核心 2015年第3期441-445,共5页
1-3型压电复合材料圆柱型换能器由薄片状1-3型压电复合材料沿金属薄壁圆管周期排列粘贴而成。根据换能器实际结构和1-3型压电复合材料等效参数模型,利用有限元法在ANSYS中分别建立了两种仿真模型。为验证等效参数模型的可靠性,实验通过... 1-3型压电复合材料圆柱型换能器由薄片状1-3型压电复合材料沿金属薄壁圆管周期排列粘贴而成。根据换能器实际结构和1-3型压电复合材料等效参数模型,利用有限元法在ANSYS中分别建立了两种仿真模型。为验证等效参数模型的可靠性,实验通过改变模型结构尺寸,使换能器内半径从20mm变化到50mm,每5mm作为一个数据点进行建模。仿真计算相同结构尺寸下两种模型的径向振动频率,比较显示两种模型仿真结果接近,平均相对误差仅2.3%。因此,可利用模型II代替模型I对1-3型压电复合材料圆柱型换能器进行仿真分析,从而简化建模和计算。在此基础上,利用模型II分别模拟了该种换能器在空气和水中径向振动频率附近的导纳、发射电压响应和接收电压灵敏度等性能。 展开更多
关键词 水声换能器 1-3型压电复合材料 圆柱形换能器 建模 有限元仿真
下载PDF
基于procaspase-3激活的抗肿瘤活性分子SM-1吸收机制研究 被引量:4
20
作者 唐靖 罗丽娜 +5 位作者 张海龙 郑志难 张杰 李溯 何花 丁劲松 《中国药理学通报》 CAS CSCD 北大核心 2014年第4期542-546,共5页
摘要:目的初步探讨新型抗肿瘤活性分子SM-1的吸收特征,为其成药性评价以及剂型设计提供研究基础。方法分别采用Caco-2细胞模型及大鼠在体肠灌流模型研究SM.1吸收特征,并通过大鼠体内药动学研究综合评价SM-1在体内的吸收程度。结果... 摘要:目的初步探讨新型抗肿瘤活性分子SM-1的吸收特征,为其成药性评价以及剂型设计提供研究基础。方法分别采用Caco-2细胞模型及大鼠在体肠灌流模型研究SM.1吸收特征,并通过大鼠体内药动学研究综合评价SM-1在体内的吸收程度。结果在10—40mg·L。时SM-1的吸收以被动扩散为主,其双向转运过程可能与浓度无关。在25—100mg·L。内,SM-1的K与Peff差异无显著性(P〉0.05),说明药物吸收无自身浓度抑制作用,SM-1的小肠吸收表现为被动扩散机制,属于高渗透性化合物。SM-1在十二指肠吸收优于其他肠段(P〈0.05),在空肠、回肠、结肠的吸收差异无显著性(P〉0.05)。初步药动学研究显示,SM-1在大鼠体内绝对生物利用度为29.3%。结论SM-1渗透性高,在肠道内吸收良好,且吸收机制主要以被动扩散为主,不受转运蛋白外排作用影响,大鼠体内绝对生物利用度较低。 展开更多
关键词 SM-1 procaspase-3 CACO-2细胞模型 在体肠灌流模型 肠吸收 绝对生物利用度
下载PDF
上一页 1 2 12 下一页 到第
使用帮助 返回顶部