检索结果-南通市图书馆

Stability,Thermal Conductivity and Photothermal Conversion Performance of Water-Based ZnO Nanofluids

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2021年第5期30卷 1581-1595页

作者： han xiaofei LU Liwei YAN Suying YANG Xiaohong TIAN Rui ZHAO Xiaoyan College of Energy and Power Engineering Inner Mongolia University of TechnologyHohhot010051China Inner Mongolia Key Laboratory of Renewable Energy Hohhot010051China

Water-based ZnO nanofluids were prepared via the two-step method,and the influences of dispersant type and mass fraction on the stability and particle size distribution of the nanofluids were *** spectral transmittances of the nanofluids were obtained by a UV-Vis-NIR *** conductivities of the nanofluids with various mass fractions were measured at different temperatures and a fitted nonlinear correlated equation was established for low-concentration application and compared with existing *** photothermal conversion performance of the nanofluids was evaluated by theoretical and experimental methods at three optical *** results showed that,CTAB as the dispersant provides better physical stability of water-based ZnO nanofluids than SDBS or GA *** of the temperature on the nanofluid thermal conductivity is remarkable with the increase of nanoparticle mass fraction,especially in the range 55°C to 75°*** maximum thermal conductivity of the studied nanofluids is 0.9488 W/(m·℃)at 75°C,43.61%higher than that of *** minimum thermal conductivity of the studied nanofluids is 0.6376 W/(m·℃)at 25°C,5.16%higher than that of *** photothermal conversion performance of the nanofluids is quite good with a maximum average absorption efficiency of 0.47,135%higher than that of water(η=0.2),and the maximum SAR is 527.5 W/g.

关键词： solar energy nanofluids stability thermal conductivity photothermal conversion

SDS-modified Nanoporous Silver as an Efficient Electrocatalyst for Selectively Converting CO2 to CO in Aqueous Solution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2019年第4期37卷 337-341页

作者： Lei Shi Yuning Zhang xiaofei han Dongfang Niu Jinlong Sun Jenny Y.Yang Shuozhen Hu Xinsheng Zhang State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Department of Chemistry University of CaliforniaIrvineCalifornia 92697United States

Selectively electrochemical conversion of CO2 into organic fuel using renewable electricity is one of the most sought-after *** this paper,we report the electrochemical reduction of CO2(CO2RR)on the nanoporous Ag electrodes made of compacted Ag nanoparticles(AgNPs),which were prepared by one-step reduction in the water phase with or without the surfactant sodium dodecyl sulfate(SDS).The scanning electron microscope(SEM)characterizations show that the compacted Ag electrodes have the nanoporous morphology formed by stacking *** with the nanoporous Ag electrode without SDS modification(C-AgNPs),the SDS-modified AgNPs electrode(C-AgNPs-SDS)is highly effective in improving selective CO production in a wide range of potentials(-0.69 V--1.19 V,***),with a Faradaic efficiency of 92.2% and a current density of -8.23 mA·cm^-2 for CO production at -0.79 V(***).C-AgNPs-SDS is also catalytically stable with only less than 7% deactivation after 8 h of continuous electrolysis.

关键词： CO2 CO Aqueous Solution

The histone acetyltransferase MOF is required for the cellular stress response

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2017年第23期62卷 1559-1561页

作者： Yang Yang xiaofei han Jing Hea Xinghong Guo Abdul Sami Shaikh Lichao Sun Shuang Gao Yiran Liang Meng Wang Xiangzhi Li The Key Laboratory of Experimental Teratology Ministry of Education and Department of Cell and Neurobiology Shandong University School of Basic Medicine Jinan 250012 China Institute of Clinical Pharmacology Qilu Hospital of Shandong University Jinan 250012 China State Key Laboratory of Molecular Oncology Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 China

When exposing to environmental stress or internal damage, such as genotoxic stress, oxidative stress, and heat stress, cells produce a series of adaptive responses called cellular stress responses. The major proteins ... 详细信息

关键词： The histone acetyltransferase MOF required for the cellular stress response

圣草素促进成骨细胞自噬减轻糖皮质激素诱导的细胞凋亡

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2024年第28期28卷 4498-4504页

作者：马运锋韩小飞河南中医药大学第二附属医院(河南省中医院)骨病一科河南省郑州市450002 河南中医药大学第二附属医院(河南省中医院)风湿病科河南省郑州市450002

背景:糖皮质激素诱导的骨质疏松症是系统性糖皮质激素治疗的常见并发症,主要表现为对成骨细胞的抑制作用。圣草素可抑制破骨细胞分化和卵巢切除术引起的骨质疏松,然而,圣草素是否调节糖皮质激素诱导的成骨细胞凋亡尚不清楚。目的:探究... 详细信息

背景:糖皮质激素诱导的骨质疏松症是系统性糖皮质激素治疗的常见并发症,主要表现为对成骨细胞的抑制作用。圣草素可抑制破骨细胞分化和卵巢切除术引起的骨质疏松,然而,圣草素是否调节糖皮质激素诱导的成骨细胞凋亡尚不清楚。目的:探究圣草素是否在地塞米松诱导的成骨细胞凋亡中发挥作用,及其潜在的作用机制。方法:采用不同浓度(0,0.5,1,2.5,5,10μmol/L)的圣草素或自噬抑制剂3-甲基腺嘌呤(5μmol/L)处理地塞米松预处理的成骨细胞MC3T3‐E1,然后用血红素加氧酶1的过表达载体(pcDNA-HMOX1)和空载体(pcDNA vector)转染MC3T3‐E1细胞。分别采用CCK-8和流式细胞术检测细胞活力和凋亡;采用ELISA检测半胱氨酸天冬氨酸蛋白酶3活性;采用Western blotting检测自噬相关蛋白LC3-Ⅱ/LC3-Ⅰ、p62、Atg5和Atg12表达,凋亡相关蛋白Bax和Bcl-2的表达,以及AMP蛋白激活激酶(AMPK)和p-AMPK蛋白表达。结果与结论:①低浓度的圣草素对MC3T3-E1细胞无毒性,且促进细胞增殖,并以剂量依赖性的方式促进自噬相关蛋白LC3-Ⅱ/LC3-Ⅰ、p62、Atg5和Atg12表达,降低半胱氨酸天冬氨酸蛋白酶3活性,抑制Bax蛋白表达,促进Bcl-2蛋白表达,减少地塞米松诱导的MC3T3-E1细胞凋亡;②此外圣草素可显著促进成骨细胞中血红素加氧酶1的表达;过表达血红素加氧酶1促进AMPK磷酸化,激活自噬,抑制地塞米松诱导的成骨细胞凋亡;③而3-甲基腺嘌呤处理抵消了血红素加氧酶1过表达对MC3T3-E1细胞的影响;④提示低浓度圣草素对成骨细胞无毒性,可以通过上调血红素加氧酶1的表达激活AMPK信号通路,从而促进自噬,抑制地塞米松诱导的成骨细胞凋亡;圣草素具有治疗糖皮质激素诱导骨质疏松症的巨大潜力。

关键词：圣草素地塞米松血红素加氧酶1 MC3T3‐E1细胞 AMPK通路

同方期刊数据库

丹参多酚酸酯调控SMAD2/FKBP1A/NF-κB轴对骨质疏松症大鼠破骨细胞分化和骨吸收的影响

在线全文

学校读者我要写书评

暂无评论

吉林大学学报（医学版） 2022年第1期48卷 111-121页

作者：马运锋韩小飞河南中医药大学第二附属医院河南省中医院骨病一科河南郑州450002 河南中医药大学第二附属医院河南省中医院风湿病科河南郑州450002

目的:探讨丹参多酚酸酯(Sal)对骨质疏松症大鼠破骨细胞分化和骨吸收的影响,阐明其作用机制。方法:体内实验,采用去势法建立骨质疏松症大鼠模型,30只雌性大鼠随机分为假手术组、模型组和Sal组(建模4周后隔天腹腔注射40 mg·kg^(-1) Sal,... 详细信息

目的:探讨丹参多酚酸酯(Sal)对骨质疏松症大鼠破骨细胞分化和骨吸收的影响,阐明其作用机制。方法:体内实验,采用去势法建立骨质疏松症大鼠模型,30只雌性大鼠随机分为假手术组、模型组和Sal组(建模4周后隔天腹腔注射40 mg·kg^(-1) Sal,共4周)。采用HE染色法观察各组大鼠股骨组织病理形态表现,双能X射线骨密度仪检测各组大鼠股骨骨密度(BMD),三点弯曲试验检测各组大鼠股骨最大载荷。体外实验,采用30μg·L^(-1)巨噬细胞集落刺激因子(M-CSF)和100μg·L^(-1)核因子κB(NF-κB)配体(RANKL)诱导骨髓巨噬细胞(BMMs)分化,细胞分为对照组、RANKL组、RANKL+Sal组(10 mg·L^(-1)Sal)、RANKL+Sal+空载体(vector)组(10 mg·L^(-1) Sal和2 mg·L^(-1) vector)、RANKL+Sal+LV-FKBP1A组[10 mg·L^(-1) Sal和2 mg·L^(-1)慢病毒介导的FKBP1A过表达载体(LV-FKBP1A)]、RANKL+Sal+LV-FKBP1A+QNZ组(10 mg·L^(-1) Sal、2 mg·L^(-1) LV-FKBP1A和10 nmol·L-1NF-κB抑制剂QNZ),MTT法检测各组细胞增殖活性,流式细胞术检测各组细胞凋亡率,Co-IP实验验证SMAD2和FKBP1A的相互作用,Westernblotting法检测各组大鼠骨组织和各组细胞中SMAD家族蛋白2(SMAD2)、FK506结合蛋白1A(FKBP1A)和磷酸化核因子-κB P65(p-P65)蛋白表达水平,酶联免疫吸附试验(ELISA)检测各组大鼠血清和各组细胞中抗酒石酸酸性磷酸酶5b(TRAP5b)水平,实时荧光定量PCR(RT-qPCR)法检测各组大鼠骨组织和各组细胞中组织蛋白酶K(CTSK)和降钙素受体(CTR)mRNA表达水平。结果:体内实验,与模型组比较,Sal组大鼠骨小梁数量明显增加,大鼠股骨BMD和最大负载明显升高(P<0.01),血清中TRAP5b水平明显降低(P<0.01),骨组织中SMAD2及FKBP1A蛋白表达水平和CTSK及CTRmRNA表达水平明显降低(P<0.01)。Co-IP实验结果证实SMAD2与FKBP1A蛋白存在相互作用。体外实验,与RANKL组比较,RANKL+Sal组细胞增殖活性明显降低(P<0.01),细胞凋亡率明显升高(P<0.01),细胞中TRAP5b水平,SMAD2、FKBP1A及p-P65蛋白表达水平和CTSK及CTRmRNA表达水平明显降低(P<0.01);与RANKL+Sal+vector组比较,RANKL+Sal+LV-FKBP1A组细胞凋亡率明显降低(P<0.01),细胞中TRAP5b水平,SMAD2、FKBP1A及p-P65蛋白表达水平和CTSK及CTRmRNA表达水平明显升高(P<0.01);与RANKL+Sal+LVFKBP1A组比较,RANKL+Sal+LV-FKBP1A+QNZ组细胞凋亡率明显升高(P<0.01),细胞中TRAP5b水平,SMAD2、FKBP1A及p-P65蛋白表达水平和CTSK及CTRmRNA表达水平明显降低(P<0.01)。结论:Sal通过调控SMAD2和FKBP1A蛋白的相互作用,抑制NF-κB活化,缓解大鼠骨质疏松症。

关键词：骨质疏松症丹参多酚酸酯 SMAD家族蛋白2 FK506结合蛋白1A 破骨细胞骨吸收

维普期刊数据库博看期刊

Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao Li Yangfei Chen Yang Jiang xiaofei Guo han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

A Decomposed Projective Method based on FBT-VMD and t-ELM for Facial Emotion Recognition

在线全文

学校读者我要写书评

暂无评论

A Decomposed Projective Method based on FBT-VMD and t-ELM fo...

卢梭《爱弥儿》在中国的传播及其启示——纪念《爱弥儿》问世225周年

第40届中国控制会议

作者： Rongfei Chen Zixiang Fei Wenju Zhou xiaofei han Huaqing Teng Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronic Engineering and Automation Shanghai University Department of Design Manufacture and Engineering Management University of Strathclyde Shanghai Instrument Research Institute

The performance of affective computing, in particular, of facial emotion recognition, is often limited by the low interpretability of the network structure, parameter redundancy, the high computational complexity with large consumption caused by CNN strategy in extracting features. The decomposed projective method, which integrates dimensional conversion,signal analysis, and dimensionality reduction for facial emotion image processing, is considered in this presentation. The main contributions of this work are the following: 1) a dimensional conversion for a facial image, which transforming the 2-D image matrix into a 1-D signal using Fan Beam Transform（FBT）;2) a hierarchical analysis method for the signal with mode decomposition（VMD） for feature selection;and 3) a method combining the t-SNE algorithm and Extreme Learning Machine（ELM） is introduced to reduce the dimension of feature vectors and predict classification. Experimental results present a satisfactory performance with 80.17% accuracy.

关键词： Affective Computing Facial Emotion Recognition Dimensionality Reduction Machine Learning

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

课程．教材．教法 2017年第10期37卷 122-127页

作者：侯怀银韩晓飞山西大学教育科学学院太原030006

《爱弥儿》1903年传入中国后,其传播经历了不同阶段,每个阶段都有不同的特点。《爱弥儿》在中国的传播具有以下四点启示:传播应站在如何接受和解读的视角而开展;传播应基于批判反思而进行;传播应基于中国教育的需要而展开;传播内容应基... 详细信息

《爱弥儿》1903年传入中国后,其传播经历了不同阶段,每个阶段都有不同的特点。《爱弥儿》在中国的传播具有以下四点启示:传播应站在如何接受和解读的视角而开展;传播应基于批判反思而进行;传播应基于中国教育的需要而展开;传播内容应基于中国文化的特点去选择。

关键词：卢梭《爱弥儿》中国传播启示

海水中的直流水平电偶极子在界面处产生的电磁场

在线全文

学校读者我要写书评

暂无评论

电波科学学报 2014年第6期29卷 1030-1035,1056页

作者：王西乾韩逍菲彭怀云陈宇中国电波传播研究所山东青岛266107 西安电子科技大学陕西西安710071

舰船底部附近的电化学电流会产生恒定电磁场,研究这种电磁场分布对水下侦测舰船非常重要.文中将该场源理想化为一个直流水平电偶极子,这一直流水平电偶极子是低频电偶极子在频率趋于0时的极限情况.利用贝赛尔函数的性质,将这些积分表达... 详细信息

舰船底部附近的电化学电流会产生恒定电磁场,研究这种电磁场分布对水下侦测舰船非常重要.文中将该场源理想化为一个直流水平电偶极子,这一直流水平电偶极子是低频电偶极子在频率趋于0时的极限情况.利用贝赛尔函数的性质,将这些积分表达式简化为一系列简单的解析表达式,并在该表达式的基础上进行分析讨论算出电磁场的空间分布.

关键词：恒定电磁场水下侦测电偶极子贝塞尔函数