检索结果-南通市图书馆

Particle motion trajectory tracking based on fiber optic tweezers

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2023年第8期19卷 462-467页

作者： ZHAO cun DONG Taiji GAO Bingkun LIU xu ZHANG Zihua Department of Electrical Information Engineering Northeast Petroleum University Qinhuangdao CampusQinhuangdao 066004China College of Electrical and Information Engineering Northeast Petroleum UniversityDaqing 163318China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China

A biosensor based on single-fiber optical tweezers is proposed,which can detect the motion trajectory of cells based on the stable capture and transmission of silica microspheres as well as biological yeast cells by using a tapered optical fiber as a sensing *** interference cavity is formed by using the fiber tip and the target particle,the detected interference signal is demodulated using Hilbert transform,and the displacement curve of the particle is plotted to realize the particle motion trajectory *** method provides potential technical support for process monitoring of targeted drug delivery in biomedicine.

关键词： fiber motion particle

肉苁蓉苯乙醇苷对酒精性肝病模型小鼠脂质代谢稳态的改善作用及其机制

在线全文

学校读者我要写书评

暂无评论

中国新药杂志 2024年第7期33卷 696-704页

作者：许源慧亓照耀刘金存孙红光齐鑫鑫从美丽刘涛新疆医科大学公共卫生学院乌鲁木齐830011

目的:利用Lieber-Decarli液体酒精饲料构建小鼠酒精性肝病(alcoholic liver disease,ALD)模型,探究肉苁蓉苯乙醇苷(Cistanche deserticola phenylethanoid glycoside,CPhGs)对酒精性脂肪肝病脂质代谢稳态的调节作用。方法:将48只雌性C57BL/6N小鼠随机分为对照组、对照+700 mg·kg^(-1) CPhGs组、模型组、模型+175 mg·kg^(-1) CPhGs组、模型+350 mg·kg^(-1) CPhGs组和模型+700 mg·kg^(-1) CPhGs组,每组8只。基于美国国家酒精滥用与酒精中毒研究所(National Institute on Alcohol Abuse and Alcoholism,NIAAA)法构建小鼠ALD模型,建模成功后,不同浓度CPhGs灌胃给药,持续14 d。测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、总胆固醇(TC)、三酰甘油(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)含量。HE和油红O染色观察肝脏病理改变情况。用比色法检测肝脏匀浆中TG,TC,HDL-C和LDL-C含量。采用WB法检测肝脏组织中过氧化物酶体增殖物激活受体α(peroxisome proliferators activated receptor α,PPARα)蛋白量表达。结合LC-MS/MS技术对肝脏进行类靶向脂质代谢检测,筛选差异代谢物并进行代谢通路分析。结果:与模型组相比,模型+700 mg·kg^(-1) CPhGs组小鼠血清AST,ALT,TG,TC和LDL-C含量显著降低,HDL-C含量升高。HE与油红O染色结果显示,模型+700 mg·kg^(-1) CPhGs组肝脏脂滴蓄积明显降低。Western blot (WB)结果显示,与模型组相比,模型+700 mg·kg^(-1) CPhGs组PPARα蛋白表达量增加。脂质代谢共筛选出16个差异代谢物,通路分析显示CPhGs主要通过调节甘油磷脂代谢、磷脂酰肌醇信号系统和磷酸肌醇代谢等代谢通路改善小鼠ALD。结论:CPhGs可以通过促进PPARα表达、增加磷脂酰胆碱(phosphatidylcholine,PC)类物质合成,调控相关脂质代谢通路,改善ALD脂质稳态。

关键词：肉苁蓉苯乙醇苷酒精性肝病脂质代谢

Effects of W and Mo Additions on Wet-dry Acid Corrosion Behavior of Low-Alloy Steels Under Different O_2 Concentrations

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第10期29卷 951-962页

作者： Qing-He Zhao Wei Liu shuan-Zhu Li Bin-Li Zhang Yi-Chun Zhu Min-xu Lu Corrosion and Protection Center Institute for Advanced Materials and Technology University of Science and Technology Beijing

Effects of W and Mo additions on wet-dry acid corrosion behavior of low-alloy steels under different O2 concentrations were investigated. The results showed that W and Mo-containing steels presented excellent wet-dry cor- rosion resistance under O2 concentrations of both 1 and 5%. The roles of W and Mo played in increasing corrosion resistance of the steels were different. W could improve the thermodynamic stability of the steel substrate, while Mo could promote the formation of protective rust. Interaction between W, Mo and O2 concentration greatly influenced wet-dry acid corrosion of low-alloy steels. W addition was more effective for depressing charge transfer process at the rust/substrate interface and presented higher enhanced effect on increasing corrosion resistance than Mo under O2 concentration of 1%. Mo was more effective on increasing rust compactness and showed higher enhanced effect on increasing corrosion resistance than W under O2 concentration of 5%.

关键词： Wet-dry acid corrosion Steel Corrosion resistance Electrochemical impedance spectroscopy(EIS) Rust

Effect of Small Content of Chromium on Wet–Dry Acid Corrosion Behavior of Low Alloy Steel

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第2期30卷 164-175页

作者： Qing-He Zhao Wei Liu Yi-Chun Zhu Bin-Li Zhang shuan-Zhu Li Min-xu Lu Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

Effect of small content of chromium（Cr） on wet–dry acid corrosion behavior of low alloy steels has been *** results show that the corrosion resistance of the steels increased with increasing Cr content from 0.10 to0.50 wt%.Higher content of Cr promotes initial corrosion and accelerates the formation of dense and protective rust in long-term *** enhanced protectiveness of the rust is closely related to its *** content of Cr increases the content of amorphous phases and decreases the content of c-Fe OOH in the rust,resulting in the high compactness of the rust and low electrochemical activity in acid *** dopes in rust and depresses the transformation from amorphous phases to a-Fe OOH,as well as the growth process of Fe OOH particles,which is responsible for the enhanced compactness of rust in long-term corrosion.

关键词： Low alloy steel Chromium Corrosion EIS TEM

Synthesis and characterization of poly(methyl methacrylate-co-polyhedral oligomeric silsesquioxane)hybrid nanocomposites

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第8期18卷 960-962页

作者： Ben Hong Yang Hong Yao xu cun Li Shan Yi Guang School of Chemistry and Chemical Engineering Anhui University Hefei 230039 China College of Material Science and Engineering ＆ State Key Laboratory of Chemical Fibers and Polymeric Materials Donghua University Shanghai 200051 China Department of Chemical and Material Engineering Hefei University Hefei 230022 China

A novel poly（methyl methacrylate-co-polyhedral oligomeric silsesquioxane） hybrid nanocomposite was synthesized by free radical polymerization and characterized by 1H NMR, 29Si NMR, and TGA technologies. Compared wit... 详细信息

关键词： Poly(methyl methacrylate) Polyhedral silsesquioxane Nanoeomposite

Influence of Marine Aerobic Biofilms on Corrosion of 316L Stainless Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2015年第8期22卷 715-720页

作者： Feng-ling xu Ji-zhou DUAN cun-guo LIN Bao-rong HOU State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research Institute Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of Oceanology Chinese Academy of Sciences

The influence of marine aerobic biofilms on the corrosion of 316L stainless steel （SS） in aerated and deaerated seawater was studied by electrochemical impedance spectroscopy （EIS）, potentiodynamic polarisation curves, current-potential curves and scanning electron microscopy with energy-dispersive spectroscopy （SEM-EDS）. EIS and SEM-EDS results showed that the aero- bic biofilms inhibited 316L SS corrosion within the test duration. Comparison of results under aerated and deaerated conditions revealed that 02 enhanced the inhibition efficiency of the aerobic biofilms. This result indicated that living cells were necessary for the aerobic biofilms to inhibit the corrosion of 316L SS. Polarization curves indicated that the biofilms mainly inhibited anode ac- tion. Current-potential curves under deaerated conditions showed that electron transfer processes occurred between microorganisms and electrodes. Moreover, 316L SS as an electron acceptor was protected from corrosion.

关键词： 316L stainless steel microbiologically influenced corrosion polarisation curve

在线全文

学校读者我要写书评

暂无评论

加快促进石家庄国际航空物流发展的对策研究

价值工程 2024年第5期43卷 56-58页

作者：侯维磊许晓伟王玉存石家庄邮电职业技术学院石家庄050023 河北机场管理集团有限公司石家庄050802

国际航空物流对于促进产业结构升级和跨境电商发展具有重要支撑作用,我国国际航空物流仍然具有广阔市场前景。文章旨在促进石家庄国际航空物流发展,总结了国内重点城市国际航空物流发展经验,结合本地实际情况,分析了石家庄国际航空物流... 详细信息

国际航空物流对于促进产业结构升级和跨境电商发展具有重要支撑作用,我国国际航空物流仍然具有广阔市场前景。文章旨在促进石家庄国际航空物流发展,总结了国内重点城市国际航空物流发展经验,结合本地实际情况,分析了石家庄国际航空物流发展的优势、劣势、机会和威胁,最后从优化发展环境,加快建设配套基础设施,完善国际航空物流网络,扩充航空口岸功能,提升国际航空物流智慧化水平等方面提出了发展建议。

关键词：石家庄国际航空物流发展

转录因子基因在大鼠肝再生中的表达方式和作用分析

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

解剖学报 2008年第3期39卷 323-328页

作者：董华明徐存拴河南省-科技部共建细胞分化调控重点实验室新乡453007 河南师范大学生命科学学院

目的探讨转录因子基因在肝再生中的表达变化及作用。方法经查阅网站资料和相关论文获得转录因子基因及其参与的生理活动,用大鼠基因组230 2.0芯片检测转录因子基因在大鼠再生肝中的表达,用手术组和假手术组比较的方法确定肝再生相关基... 详细信息

目的探讨转录因子基因在肝再生中的表达变化及作用。方法经查阅网站资料和相关论文获得转录因子基因及其参与的生理活动,用大鼠基因组230 2.0芯片检测转录因子基因在大鼠再生肝中的表达,用手术组和假手术组比较的方法确定肝再生相关基因。结果初步证实上述基因中有320个基因与肝再生相关,涉及细胞代谢、增殖、分化、凋亡等16种生理活动。它们在肝再生中的表达分为41种方式,表明肝再生中细胞生理生化活动具有阶段性、多样性和复杂性。其中,肝再生早期[部分肝切除（PH）后0.5～4h]和前期（PH后6～12h）糖类合成,脂类代谢和炎症反应相关转录因子基因表达增强,中期和后期细胞增殖、生长、分化和凋亡相关转录因子基因表达增强。结论肝再生的生理生化活动受多种转录因子基因调控。其中,e2f1、fos、copeb等转录因子基因发挥关键作用。

关键词：部分肝切除转录因子肝再生相关基因基因组2302.0芯片大鼠

A Potential Alternative to Polystyrene: Ring-opening Terpolymerization of Different Epoxides with Phthalic Anhydride Using Metal-free Dual Catalysts

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第3期39卷 337-343,I0006页

作者： Li-Miao Lin Yong-Hang xu Man Shen Jia-Xin Liang shuan-Jin Wang Min Xiao Yue-Zhong Meng The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China School of Materials Science&Energy Engineering Foshan UniversityFoshan 528000China

A series of semi-aromatic polyesters named as Poly(PO-CHO-PA) were facilely synthesized via ring-opening terpolymerization of biobased cyclohexane oxide(CHO)/propylene oxide(PO)/phthalic anhydride(PA) using economical U1/PPNCl as dual catalyst. The proportion of CHO-PA and PO-PA segments in polymer can be readily altered by changing the feed ratio of CHO/PO because the reactivity ratios of CHO and PO with PA calculated by Fineman-Ross method are comparable. All synthesized amorphous polyesters with various compositions show one Tg ranging from 62 ℃ to 133 ℃. Significantly, the mechanical, thermal and barrier properties of these amorphous semi-aromatic polyesters are also adjustable and investigated for the first time. The results indicate the semi-polyesters exhibit superior thermostability(T5% ranging from 306 ℃ to323 ℃) and high tensile strength(40.21-55.7 MPa) that is comparable with polystyrene(PS). Furthermore, Poly(PO-CHO-PA) films possess a promising prospect as packaging materials because of its colorless and highly transparent nature, along with low oxygen and water vapor transmission rate. All above performances may guarantee its potential alternative to commercial PS.

关键词： Aromatic polyester Ring-opening polymerization Metal-free catalyst Polystyrene Barrier properties