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Enhanced dielectric and optical properties of nanoscale barium hexaferrites for optoelectronics and high frequency application

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Chinese Physics B 2018年第12期27卷 517-525页

作者： j Mohammed A B Suleiman Tchouank Tekou Carol T h Y hafeez jyoti Sharma Pradip K Maji Sachin Godara Kumar A K Srivastava Department of Physics School of Chemical Engineering and Physical Sciences Lovely Professional University Department of Physics Faculty of Science Federal University Dutse SRM Research Institute SRM University Department of Polymer and Processing Engineering Indian Institute of Technology Roorkee Department of Chemistry Guru Nanak Dev University

M-type barium hexaferrites with chemical composition ba1-xDyxFe12-yCryO19(x = 0.0, 0.1, 0.2, and y =0.0, 0.4, 0.5) were synthesized via sol–gel auto-combustion method. The samples were pre-sintered at 400℃ for 3 h and sintered at 950℃ for 5 h. The changes in the structural, dielectric, and optical properties were studied after the substitution of Dy3+and Cr3+ions. X-ray diffraction(XRD) analysis confirms the formation of single phase hexaferrites with the absence of secondary phase. FTIR analysis gives an idea of the formation of hexaferrites with the appearance of two peaks at 438 cm-1and 589 cm-1. The field emission scanning electron micrographs(FESEM) show a combination of crystallites with large shapes close to hexagonal platelet-like shape and others with rice or rod-like shapes, whereas EDX and elemental analysis confirm the stoichiometry of prepared samples. The calculated band gap from UV-vis NIR spectroscopy spectra was found to decreases with increase in Dy3+–Cr3+substitution. The dielectric properties were explained on the basis of Maxwell–Wagner model. Enhancement of dielectric constant at higher frequencies was observed in all the samples. Low dielectric loss is also observed in all the samples and Cole–Cole plot shows that grain boundary resistance(Rgb) contribute most to the dielectric properties. The prepared samples exhibit properties that could be useful for optoelectronics and high frequency application.

关键词： Maxwell–Wagner model dielectric constant Cole–Cole plot optical band-gap

Photonic Crystal Fibers

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光学学报 2003年第S1期23卷 11-12页

作者： William j. Wadsworth jonathan C. Knight William h. Reeves Philip St.j. Russell Department of Physics University of Bath Bath BA2 7AY UK.Department of Physics University of Bath Bath BA2 7AY UK.Department of Physics University of Bath Bath BA2 7AY UK.Department of Physics University of Bath Bath BA2 7AY UK.

By offering greatly enhanced control of light compared to conventional step-index structures, photonic crystal fibres are radically improving the performance of linear and nonlinear fibre devices, including gas-Raman ... 详细信息

关键词： PCF of or Photonic Crystal Fibers in

肌钙蛋白Ⅰ测定在急性亚硝酸盐中毒监测中的临床意义

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上海医学 2006年第9期29卷 653-655页

作者：巴建明同济大学附属第十人民医院急诊科上海200072

目的观察急性亚硝酸盐中毒患者肌钙蛋白Ⅰ的变化,分析其与疾病程度和预后的关系。方法132例急性亚硝酸盐中毒患者,均于发病后3 h内进入急诊抢救室治疗。于入院后3和24 h测定肌钙蛋白Ⅰ。将患者分为肌钙蛋白Ⅰ正常组(A组)和肌钙蛋白Ⅰ升... 详细信息

目的观察急性亚硝酸盐中毒患者肌钙蛋白Ⅰ的变化,分析其与疾病程度和预后的关系。方法132例急性亚硝酸盐中毒患者,均于发病后3 h内进入急诊抢救室治疗。于入院后3和24 h测定肌钙蛋白Ⅰ。将患者分为肌钙蛋白Ⅰ正常组(A组)和肌钙蛋白Ⅰ升高组(B组),比较两组患者急性生理与慢性健康状况评分(APAChE)Ⅱ、脏器衰竭率和病死率。结果B组APAChEⅡ评分为(20±7)分,明显高于A组的(11±3)分(P＜0．05)。B组脏器衰竭率和病死率分别为20．0%和12．9%,均明显高于A组的0%和0%(P值均＜0．01)。结论急性亚硝酸盐中毒患者中肌钙蛋白Ⅰ升高者的APAChEⅡ评分高、预后差。肌钙蛋白Ⅰ测定可作为急性亚硝酸盐中毒预后监测的一项可靠指标。

关键词：肌钙蛋白Ⅰ 急性亚硝酸盐中毒急性生理与慢性健康状况评分Ⅱ

针刺对高脂饮食诱导的肥胖小鼠炎症因子表达的影响

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中医药导报 2024年第8期30卷 53-57页

作者：秦鸿宇王玉琳杨添淞巴特孙忠人王飞龙张淼黑龙江中医药大学黑龙江哈尔滨150040 黑龙江中医药大学附属第一医院黑龙江哈尔滨150040 黑龙江中医药大学附属第二医院黑龙江哈尔滨150001

目的:观察针刺对高脂饮食诱导的肥胖小鼠的治疗作用及对血清炎症因子蛋白和m RNA表达的影响,探讨针刺减轻肥胖小鼠体质量的作用机制。方法:从50只C57BL/6j小鼠中随机筛选12只为空白组,饲以正常饮食,剩余38只饲以高脂饮食饲养12周。将造... 详细信息

目的:观察针刺对高脂饮食诱导的肥胖小鼠的治疗作用及对血清炎症因子蛋白和m RNA表达的影响,探讨针刺减轻肥胖小鼠体质量的作用机制。方法:从50只C57BL/6j小鼠中随机筛选12只为空白组,饲以正常饮食,剩余38只饲以高脂饮食饲养12周。将造模成功的24只小鼠随机分为模型组和针刺组。治疗4周后,比较各组小鼠体质量、血清脂质水平的差异,hE染色观察各组小鼠肝脏和附睾脂肪的形态,用Western blotting检测各组小鼠血清中IL-1β、IL-6、TNF-α、MCP-1蛋白表达水平,采用实时荧光定量PCR检测各组小鼠血清中IL-1β m RNA、IL-6 mRNA、TNF-α mRNA、MCP-1 mRNA表达水平。结果:与模型组比较,针刺组小鼠体质量以及血清中TC、TG、LDL含量明显降低;针刺组小鼠的肝脏脂质代谢明显改善,脂肪细胞大小明显缩小,血清中炎性因子IL-1β、IL-6、TNF-α、MCP-1蛋白表达水平及IL-1β mRNA、IL-6 mRNA、TNF-α m RNA、MCP-1 mRNA的水平明显下降。结论:针刺能明显降低肥胖小鼠体质量,改善肥胖小鼠的病理损伤情况,下调血清中TC、TG、LDL的含量以及炎性因子IL-1β、IL-6、TNF-α、MCP-1蛋白表达水平及IL-1β mRNA、IL-6 mRNA、TNF-α mRNA、MCP-1 mRNA的表达,达到治疗肥胖的目的。

关键词：肥胖针刺高脂饮食小鼠炎症因子

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激光熔覆制备金属间化合物抗冲蚀涂层

航空制造技术 2004年第Z1期47卷 79-81,122页

作者： X.Y. Xu W.j. Liu M.L. Zhong h.Q. Sun X.Y. Xu R. Z. ba

采用同轴送粉方法,激光熔覆制备了WC增强Ni3Al金属间化合物基复合涂层,通过试验,优化了工艺参数,对激光熔覆涂层的成分、组织和硬度进行了测试和分析.结果表明,激光熔覆涂层无裂纹和气孔,与基体形成良好的冶金结合,WC颗粒的添加显著提... 详细信息

采用同轴送粉方法,激光熔覆制备了WC增强Ni3Al金属间化合物基复合涂层,通过试验,优化了工艺参数,对激光熔覆涂层的成分、组织和硬度进行了测试和分析.结果表明,激光熔覆涂层无裂纹和气孔,与基体形成良好的冶金结合,WC颗粒的添加显著提高了涂层硬度.

关键词：激光熔覆金属间化合物镍铝化合物

术前影像学结果预测胆道闭锁病人Kasai术后2年自体肝生存率

维普期刊数据库评论

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国际医学放射学杂志 2024年第3期 373-373页

作者： h.Kim S.Y.Yoo j.h.Kim M.j.Kim S.Lee T.Y.jeon 吴玉平

摘要目的探讨应用术前影像学指标预测胆道闭锁（ba）病人Kasai术后2年自体肝生存率的可行性。方法回顾性分析2000—2020年接受Kasai手术的190例ba病人，

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Spectroscopic analysis of trivalent Nd3+/Yb3+ions codoped in PZS host glasses as a new laser material at 1.06μm

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journal of Rare Earths 2017年第4期35卷 361-367页

作者： B.Afef h.h.hegazy h.Algami Y.Yang K.Damak E.Yousef R.Maalej Georessoures Materials Enviroment and Global Changes Laboratory Faculty of SciencesUniversity of SfaxSfax 3018Tunisia Department of Physics Faculty of SciencesAI Azhar UniversityAssuit branchAssuit 11795Egypt Department of Physics Faculty of SciencesKing Kha[id UniversityP.O.Box 9004Abha 61466Saudi Arabia College of Physics Science and Technology Hebei UniversityBaoding 071002China Department of Physics Pukyong National UniversityBusan 608-737Republic of Korea

This paper reports on the spectral results of Nd3＋/yb3＋ ions codoped 50P2Os-30ZnO-20SrO （PZS, in mol.%） glasses which were prepared by a melting technique. The glass transition temperature and spectroscopic properties of these glasses were estimated. From the absorption spectra, judd-Ofelt （j-O） intensity parameters （Ωk）, were calculated. Using j-O intensity parameters, several radiative properties such as spontaneous transition probabilities （AR）, radiative branching ratios （fiR） and radiative lifetimes （rR） were determined for the exciting levels of the Nd3＋ ions. The large value of the stimulated integrated cross-section and the lifetimes of Nd3~ level revealed the potential of the present glasses as a candidate for generating laser emission at 1.06/am as continuous wave laser action and exploited for optical device fabrication. A broad emission band from 950 to 1100 nm was detected when the Nd3＋/yb3＋ was co-doped in PZS glasses excited by 805 nm lighting diode （LD）. The energy transfer process from Nd3＋--→Yb3＋ in co-doped phos- phate glasses was described in this paper.

关键词： phosphate glasses Nd3+,yb3+ ions optical spectroscopy judd-Ofelt analysis luminescence rare earths

Potential Anti-cancer Activity of Furanodiene

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Chinese journal of Cancer Research 2009年第2期21卷 154-158页

作者： Zhen-zhen ba Yan-ping Zheng hui Zhang Xiu-yan Sun Dong-hai Lin School of Pharmaceutical Science Yantai University Yantai 264005 China

Objective： To study the isolated from the essential oil VIVO anti-tumor activities of furanodiene of the rhizome of Curcuma wenyujin （C15h200）, a primary sesquiterpene compound Yh Chen et C. Ling（Wen Ezhu）, in vitro and in Methods： In vitro MTT assay was used to further study the effects of time and dosage on anti-proliferation of furanodiene against the sensitive hela, hep-2, hL-60, U251 cells, based on the cytotoxic effects of furanodiene on 12 human malignant tumor cell lines with the essential oil of Wen Ezhn as control., and the half-inhibitory concentration （IC50） was observed. In vivo uterine cervix （U14） tumor cell was selected and the conventional assay method of anti-tumor activity was employed. Furanodiene liposome was administered intraperitoneally, and tumor-inhibitory rate, thymus and spleen indexes were observed. Results： The inhibitive effects on cell proliferation were shown in all of the twelve cell lines and the cytotoxic effects of furanodiene against hela, hep-2, hL-60, U251 cells were observed after 12 h of administration, the effect could last for at least 48 h in a dose dependent manner, and the IC50 values were 0.6, 1.7, 1.8, 7.0μg/ml, respectively. Furanodiene was also found to show inhibitive effects on the proliferation of uterine cervix （U14） tumor induced in mice. The tumor inhibition rates were 36.09% （40 mg/kg）, 41.55% （60 mg/kg）, 58.29% （80 mg/kg）, respectively. Conclusion： Furanodiene is one of primary anti-cancer active components in the essential oil of Wen Ezhu, and also a very effective agent against uterine cervix cancer, and has protection effect on the immune function.

关键词： Essential oil of Wen Ezhu Furanodiene Anti-cancer Uterine cervix cancer

Investigations on Fe-doped strontium barium niobate,single phase ferroelectric and magnetodielectric compounds

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journal of Advanced Dielectrics 2015年第1期5卷 1-7页

作者： S.h.Kshirsagar S.R.jigajeni A.N.Tarale D.j.Salunkhe Solapur University Solapur 413255MaharashtraIndia Walchand Institute of Technology SolapurMaharashtraIndia

To understand possible interaction between magnetic and electric order parameters of Fe-doped Sr_(x)ba_(1-x)Nb_(2)O_(6)(SBN),Fe-doped Sr_(0.5)ba_(0.5)Nb_(2)O_(6)(SBN50)and Sr_(0.4)ba_(0.6)Nb_(2)O_(6)(SBN40)are synthesized and *** has been carried out via ceramic *** paper reports synthesis,crystal structure,dielectric properties,P-E hysteresis loops,M-h hysteresis loops and magneto-capacitance of the Fe-doped SBN *** the compositions are observed to exhibit a useful value of magnetocapacitance,especially at frequencies less than 10 khz.

关键词： SBN Fe-doped SBN relaxor PE hysteresis magnetodielectric