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Journal of Rare Earths 2013年第7期31卷 715-721页

作者： Samir Alghool M.sh.Zoromba hanan F.Abd El-halim Department of Chemistry Faculty of SciencePort Said UniversityPort Said 42521Egypt Department of Chemistry Faculty of PharmacyMisr International UniversityIsmailia RoadKm 28 CairoEgypt

Complexes of La （iii）, Nd（iii）, Gd（iii）, Sm（iii）, and Ce（iV） were synthesized with Schiff base [（3,5-di-tert-butyl-2-hy- droxybenzyl） amino] acetic acid （h3L）. The ligand and its complexes were synthesized and characterized based on the following analysis： elemental analyses, FAB-mass, molar conductance measurements, magnetic measurement, UV-visible, iR, and NMR spectral studies. The spectral data revealed that the ligand acted as a neutral tridentate coordinating to metal ion through ONO donor sequence. Thermal degradation studies of the ligand and its complexes showed that the previous lanthanide complexes were more thermally stable than the ligand itself. The Schiff base and its complexes were screened for their antibacterial （Escherichia coli, Staphylococcus aureus） and antifungal （Aspergillus flavus and Candida Albicans）.

关键词： lanthanide Schiffbase complexes physical properties biological activity rare earths

Characteristic Assessment of Stabilized Polyacrylonitrile Nanowebs for the Production of Activated Carbon Nano-Sorbents

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Chinese Journal of Polymer Science 2014年第4期32卷 449-457页

作者： S.Rafiei B.Noroozi sh.Arbab A.K.haghi Department of Textile Engineering University of Guilan

Polyacrylonitrile （PAN） nanofibers with average diameter of 300 nm were produced by electro-spinning. The nanofibers were stabilized at different temperatures in the range of 180-270 ℃in several duration times and heating rates. Fourier transforms infrared （FTiR） spectroscopy, differential scanning calorimetry （DSC） and X-ray diffraction （XRD） analyzing techniques were employed to measure the extent of stabilization reaction. By all procedures, the ranges of temperature and duration time recommended were about 250-270 ℃ and 1-2 h, respectively. increasing the activation temperature from 800 ℃ to 1200 ℃ caused porosity and pore volume development up to 60% and 0.532 cm3/g, respectively. Pore width of all samples was calculated to be about 0.7 nm confirming micro-pore structure of the produced PAN based activated carbon nanofibers. Comparing dye adsorption for different adsorbents including chitin and granular activated carbon （GAC） showed the highest efficiency for the produced activated carbon nanofibers （ACNFs）.

关键词： Polyacrylonitrile Electro-spinning Stabilization Activated carbon nanofibers Adsorbent.

A New 6,7-Seco-Ent-Kaurane Diterpenoid from isodon eriocalyx Var. laxiflora

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Chinese Chemical Letters 2001年第10期12卷 897-898页

作者： Niu, XM Li, sh Mei, SX Lin, ZW Sun, hD Acad Sinica Kunming Inst Bot Lab Phytochmistry Kunming 650204 Peoples R China

A new 6,7-seco-ent-kaurane diterpenoid, together with two known ones, was isolated from the leaves of isodon eriocalyx var. laxiflora C. Y. Wu & h. W. Li. Their structures were established by spectroscopic methods.

关键词： isodon eriocalyx var. laxiflora 6,7-seco-ent-kaurane diterpenoid laxiflorin E

ABSOLUTE RETRACTiViTY OF SOME SETS TO TWO-VARiABLES MULTiFUNCTiONS

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Analysis in Theory and Applications 2012年第1期28卷 73-78页

作者： h.Afshari sh.Rezapour shahid Madani University Iran

in this paper, by providing some different conditions respect to another works, we shall present two results on absolute retractivity of some sets related to some multifunctions of the form F ： X × X → Pb,cl （X）,... 详细信息

关键词： absolute retract fixed points set multifunction

Organic X-Ray image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

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Energy & Environmental Materials 2024年第6期7卷 230-237页

作者： Jong-Woon ha Seung hun Eom Bo Kyung Cha Seyeong Song hyeong Ju Eun Jong h.Kim Jong Mok Park BongSoo Kim Byoungwook Park Seo-Jin Ko Sung Cheol Yoon Changjin Lee in hwan Jung Do-hoon hwang Department of Chemistry Chemistry Institute for Functional MaterialsPusan National UniversityBusan 46241Korea Division of Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Electro-Medical Device Research Center Korea Electrotechnology Research Institute(KERI)Ansan 15588Korea Graduate School of Carbon Neutrality School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Molecular Science and Technology Ajou UniversitySuwon 16449Korea Research Center for Advanced Specialty Chemicals Korea Research Institute of Chemical TechnologyUlsan 44412Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Organic and Nano Engineering Human-Tech Convergence ProgramHanyang University222 Wangsimni-roSeongdong-guSeoul 04763Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency ***,this is quite challenging because of the heavy weight of the scintillator and silicon *** weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic *** study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer(~700 nm),owing to the symmetric backbone and highly soluble molecular structure of *** ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density(Jd~10−10 A cm^(−2))at a negative bias(−2.0 V)while maintaining high responsivity(R=0.29 A W−1)even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_(sh)^(*)=2.18×10^(13)Jones in the organic *** organic photodetectors are developed by slot-die coating for use in X-ray detectors,which exhibit D_(sh)^(*)=2.73×10^(12)Jones with clear rising(0.26 s)and falling(0.29 s)response times upon X-ray *** reliability is also proven by linear response of the X-ray detector,and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray

Effect of Sulfur Precursor on Dimensions of One-dimensional CdS Nanocrystals

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Journal of Materials Science & Technology 2009年第4期25卷 462-464页

作者： M.Maleki sh.Mirdamadi R.Ghasemzadeh M.Sasani Ghamsari Department of Metallurgy and Material Engineering Iran University of Science & Technology Solid State Lasers Research Group Laser & Optics Research School

One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and Na2S, as a sulfur precursor, and ethylenediamine as a solvent at 150℃ for 5 h. The nanocrystals were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and UV-Vis absorption spectroscopy. XRD patterns indicate that both Na2S and elemental sulfur as the sulfur precursor result in CdS nanorods with wutzite phase （hexagonal structure）. SEM and TEM images show that diameter of CdS nanorods can be decreased using Na2S instead of elemental sulfur. For the growth of CdS nanorods, a mechanism has been proposed. Uv-Vis absorption of CdS nanorods （sulfur precursor： Na2S） was shown blue shift to 485 nm due to the quantum size effect.

关键词： Nanomaterials Semiconductors CdS nanorods Na2S Solvothermal method

丹酚酸B-葛根素联用对氧糖剥夺/复氧损伤的sh-SY5Y神经细胞焦亡的影响

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中国实验方剂学杂志 2024年第3期30卷 54-63页

作者：涂舒欣王艳贺晓丽中国医学科学院北京协和医学院药用植物研究所北京100193

目的:基于细胞焦亡探讨丹酚酸B和葛根素合用对氧糖剥夺/复氧(oxygen-glucose deprivation/reoxygenation,OGD/R)损伤的sh-SY5Y神经细胞的保护作用及机制。方法:利用sh-SY5Y细胞构建OGD/R损伤模型,设立正常对照组(control)、模型组(OGD/R)、10μmol·L^(-1)丹酚酸B组(salvianolic acid B,Sal B)、100μmol·L^(-1)葛根素组(puerarin,Pue)、10μmol·L^(-1)丹酚酸B和100μmol·L^(-1)葛根素合用组(SP)及10μmol·L^(-1)NOD样受体蛋白3(NLRP3)炎症小体抑制剂MCC950组。除正常组外,其余各组细胞在氧糖剥夺6 h后迅速复糖复氧12 h进行OGD/R造模。采噻唑蓝(MTT)法检测细胞存活率,光学显微镜下观测细胞形态,分光光度计法检测培养上清中乳酸脱氢酶(LDh)释放率,hoechst/Pi染色检测细胞膜损伤情况,实时荧光定量聚合酶链式反应(RT-qPCR)检测NLRP3、半胱氨酸蛋白酶1(caspase-1)、消皮素D(GSDMD)、凋亡斑点样蛋白(ASC)和白细胞介素-1β(iL-1β)的mRNA表达水平,免疫荧光检测NLRP3和caspase-1蛋白表达的变化,蛋白免疫印迹法(Western blot)检测iL-1β、ASC、NLRP3、caspase-1和活化半胱氨酸蛋白酶1(cleaved caspase-1)蛋白表达的变化。结果:与正常组比较,模型组shSY5Y细胞存活率显著降低(Ph渗漏率显著提高(PiL-1β的mRNA表达水平显著提高(PiL-1β、ASC、NLRP3、caspase-1和cleaved caspase-1蛋白的表达水平显著提高(Psh-SY5Y细胞的存活率(Ph的渗漏(Psh-SY5Y细胞NLRP3、caspase-1、GSDMD、ASC和iL-1β的mRNA表达水平(PiL-1β、ASC、NLRP3、caspase-1和cleaved caspase-1蛋白的表达水平(Psh-SY5Y细胞造成的损伤,这可能与其能够抑制细胞焦亡相关。

关键词：缺血性脑卒中氧糖剥夺/复氧模型丹酚酸B 葛根素细胞焦亡

in-vitro assessments of micro arc oxidized ceramic flms on AZ31 magnesium implant: Degradation and cell-surface response

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Progress in Natural Science:Materials international 2013年第4期23卷 425-433页

作者： A.Seyfoori sh.Mirdamadi M.Mehrjoo A.Khavandi School of Metallurgy and Materials Engineering Iran University of Science and Technology National Cell Bank Pasteur Institute of Iran

in this research,phosphate and silicate based ceramic flms were synthesized via micro arc oxidation(MAO) method on the surface of the magnesium *** the aim of orthopedic application of these coatings,corrosion behavior of them was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in simulated body fuid(SBF) *** results indicated better corrosion resistance of the phosphate flm compared to the silicate ***,based on immersion tests,less ph and weight changes were obtained for the phosphate ***(G292) Cell response of the coated specimens showed better cell morphology on the surface of the phosphate flm than silicate flm after 6 and 24 h of *** was related to the more surface roughness and less degradation rate of the phosphate flm compared with silicate coating.

关键词： Corrosion Magnesium G292 cell Micro arc oxidation

Growth of TiO_2 Nanorods by Sol-gel Template Process

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Journal of Materials Science & Technology 2007年第5期23卷 611-613页

作者： A.Sadeghzadeh Attar sh.Mirdamadi F.hajiesmaeilbaigi M.Sasani Ghamsari Department of Metallurgy and Materials Engineering Iran University of Science and TechnologyTehranIran Solid State Laser Research Group Laser Research Center11365-8486TehranIran

in this work, TiO2 nanorods with uniform diameter of about 100 nm and a length of several micrometers were successfully prepared by the sol-gel template method. Also the influence of molar ratios of precursor on the morphology and structure of TiO2 nanorods has been investigated. The prepared samples were characterized by Fourier transform infrared spectroscopy （FTiR）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The XRD results indicated that the TiO2 nanorods were crystallized in the anatase and rutile phases, after annealing to 400-700℃ up to 2 h.

关键词： TiO2 nanorods Sol-gel process Template-based growth

近20年季风爆发前后珠江三角洲前汛期短时强降水的时空演变特征与成因

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大气科学 2024年第2期48卷 715-734页

作者：江帆王东海曾智琳中山大学大气科学学院/广东省气候变化与自然灾害研究重点实验室/热带海洋系统科学教育部重点实验室/南方海洋科学与工程广东省实验室(珠海) 珠海519082 厦门市同安区气象局厦门361100 厦门市海峡气象开放重点实验室厦门361012 澳门科技大学澳门环境研究院/澳门海岸带生态环境国家野外科学观测研究站中国澳门999078 广东省气象台广州510640 中国气象局龙卷风重点开放实验室佛山528000

相较于暴雨这种日尺度强降水,短时强降水(≥20 mm h^(−1))是造成山洪滑坡与城市内涝等灾害更为直接的因素。本文利用地面气象观测站和ERA5再分析数据,重点研究南海季风爆发前后珠江三角洲地区(简称珠三角)短时强降水的时空演变特征,并... 详细信息

相较于暴雨这种日尺度强降水,短时强降水(≥20 mm h^(−1))是造成山洪滑坡与城市内涝等灾害更为直接的因素。本文利用地面气象观测站和ERA5再分析数据,重点研究南海季风爆发前后珠江三角洲地区(简称珠三角)短时强降水的时空演变特征,并探索了短时强降水在季风爆发前后特征差异的可能成因。研究表明:(1)相较于季风爆发前,珠三角地区季风爆发后的降水明显增多,其中短时强降水贡献的比例显著增加。对短时强降水本身而言,区域平均强度以及极端性在季风爆发前后差异总体较小,但短时强降水频率在季风爆发后增加70%。(2)短时强降水高发区主要集中在珠三角东北部和珠江口西侧沿海,季风爆发后上述两个地区的频次增多最明显。短时强降水频率由季风爆发前的单峰型(下午)转为季风爆发后的双峰型(早晨与下午)。(3)短时强降水具有明显的区域性变化特征,短时强降水在季风爆发后的平均雨强和极端性在珠江口西侧沿海较内陆地区明显增强,其频次峰值时间在沿海地区从季风爆发前的午后转为季风爆发后的早晨,内陆地区在季风爆发前后均集中在下午。(4)季风爆发后,短时强降水期间的低层环境水汽超过同期气候态水平的16%。充沛的水汽在夜间在季风加速作用下被输送至沿海,并与陆风作用增强了辐合,这解释了沿海短时强降水的在季风爆发前后频次峰值时间转换现象。(5)相较于季风爆发前,季风爆发后珠三角短时强降水频率与低层水汽通量的相关性明显升高。珠三角沿海地区夜间—早晨短时强降水的增多与中低层风场结构改变造成的动力强迫有关。内陆地区季风爆发前后短时强降水与环境热力和不稳定条件关系更大。这些结果有助于我们更好地了解珠三角地区在季风爆发前后短时强降水的时空分布特征和理解其产生机制。

关键词：短时强降水珠三角地区季风爆发前后时空分布可能成因