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中性空位引起的本征扩散对硅中注入砷离子在退火过程中再分布的影响

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Journal of Semiconductors 1990年第8期11卷 642-645页

作者：汤庭鳌郑大卫 c.a.paz de araujo 复旦大学电子工程系 University of colorado at colorado Springs USA

本文对硅中砷扩散系数考虑了中性空位引起的本征扩散项D^0的影响,推导而得出D^0对表面浓度N_s,结深x_j(t)等的影响大约为5-10％。在离子注入退火的解析模型中考虑其影响是有实际意义的。

关键词：离子注入硅砷离子退火本征扩散

用数值法分析TF-SOI-MOS管沟道区的电势分布

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Journal of Semiconductors 1992年第12期13卷 736-741页

作者：汤庭鳌郑大卫黄宜平 c.a.paz de araujo 复旦大学微电子所 University of colorado Colorado SpringsU.S.A.CO 80933-7150

本文对 TF-SOI/MOS管,采取双栅极模型,用有限元和有限差分法分别求解沟道区的电势分布,得到了前栅(front gate)及背栅(back gate)MOS体电势二维分布.总结了指导TF-SOI-MOS 器件研制的要点.并对TF-SOI-MOS器件数值模拟方法进行了讨论.

关键词： MOS器件电热分布沟道区

硅中高浓度注入的硼砷离子在热氧化中的再分布

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复旦学报(自然科学版) 1988年第3期 247-252页

作者：汤庭鳌,c.a.paz de araujo 复旦大学电子工程系 dept.of E. E. UccS

本文利用杂质在氧化气氛中的有效扩散系数,通过解扩散方程,首次得到了硅中高浓度注入硼和砷离子在热氧化气氛中再分布的解析表达式。结果表明,在热氧化气氛中杂质再分布的结深与时间之间的三分之一次方关系多了一个修正项。

关键词：扩散系数离子注入退火热氧化。

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亚微米MOS场效应管的完全解析二维模型

Journal of Semiconductors 1992年第9期13卷 564-572页

作者：汤庭鳌 c.a.paz de araujo 复旦大学电子工程系上海200433 University of colorado.colorado Springs U.S.A.

本文对二维非线性泊松方程这一基本问题进行了求解.采用一个微分算符将泊松方程分解成自由载流子部份和掺杂分布部份.自由载流子部份正是著名的刘维方程,具有解析解。掺杂分布部份采用“相似变换”的方法予以求解.将包含自由载流子影响... 详细信息

本文对二维非线性泊松方程这一基本问题进行了求解.采用一个微分算符将泊松方程分解成自由载流子部份和掺杂分布部份.自由载流子部份正是著名的刘维方程,具有解析解。掺杂分布部份采用“相似变换”的方法予以求解.将包含自由载流子影响的完全的二维电势分布用于亚微米MOS场效应管,得到了阈值电压的解析模型.它能很好地说明短沟道效应.本解析模型的特点是其完整性及简单性.它能很方便地用于器件模拟,也能推广到三维情况.

关键词：亚微米集成电路场效应管模型

Synthesis of coral-like structures of Pr-Yb co-doped YIG: Structural,optical, magnetic and antimicrobial properties

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Journal of Rare Earths 2024年第3期42卷 543-554,I0004页

作者： A.Fernandez Francisca P.araujo Y.Guerra S.castro-Lopes J.Matilla-Arias Idglan S.de Lima Edson c.Silva-Filho Josy A.Osajima F.Guerrero R.Pena-Garcia Federal University of Piau Graduate Program in Materials Science and EngineeringTeresinaPIBrazil Federal Rural University of Pernambuco Academic Unit of Cabo de Santo AgostinhoCabo de Santo AgostinhoPEBrazil Federal University of Piaui Department of PhysicTeresinaPBrazil Federal University of Pernambuco Graduate Program in Materials ScienceRecifePEBrazil University of Granma Departmentof Basic Sciences and Applied InformaticsFaculty of Technical SciencesBayamoCuba Federal University of Amazonas Department of PhysicManausAMBrazil Federal University of Pernambuco Department of PhysicRecifePEBrazil

coral-like structures of the Y_(3-x)Pr_(x)Fe_(5-y)Yb_(y)O_(12),(0.00 ≤ x ≤ 0.04, 0.00 ≤ y ≤ 0.02) compound were synthesized using the sol-gel method. Structural investigation certified the YIG cubic crystal structure formation, without any secondary phase. It is shown that, the relatively large ionic radius of the dopant cations results in an expansion of the lattice parameter, variations in the Iona-O-Iondangle, Iona-O,Iond-O and Ionc-O bond distances and decrease in the average crystallite size. Fourier transform infrared(FTIR) and Raman measurements are essential to testify the single-phase formation of YIG crystal structure and are observed changes in the stretching and vibrational modes, respectively. The morphological study, energy dispersive spectroscopy(EDS) spectra and textural properties show corallike structures, peaks associated with Pr^(3+) and Yb^(3+) atoms and the effect of dopants on surface area,diameter, and pore volume, respectively. The optical analysis from diffuse reflectance spectra witnessed an increase in the optical gap band, a decrease in Urbach energy and blue shift in the charge transfer,correlated with the expansion of the unit cell due to the dopant's insertion in the YIG structure. A typical ferrimagnetic behavior is exhibited by the Y_(3-x)Pr_(x)Fe_(5-y)Yb_(y)O_(12)compound. The saturation magnetization(M_(s)), cubic anisotropy constant(K_(1)) and coercive field(H_(c)) increase with the Pr^(3+)cations content, as consequence of their magnetic nature and distribution around of Fe^(3+)ions due to the coexistence with the Yb^(3+). Finally, for the first time, antibacterial tests by mean of the direct contact method were performed for YIG co-doped with Pr^(3+)and Yb^(3+)and it is shown that, relatively high dosages of Pr^(3+) cations favored the activity against S. aureus, therefore, a new biological property for YIG doped with rare earths is presented.

关键词： Yttrium iron garnet(YIG) coral-like structures Rare earths Band gap energy Magnetic properties Antimicrobial properties

Transarterial embolization is an acceptable bridging therapy to hepatocellular carcinoma prior to liver transplantation

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World Journal of Transplantation 2024年第2期14卷 126-134页

作者： Gabriel Lazzarotto-da-Silva Leandro A Scaffaro Mauricio Farenzena Lucas Prediger Rafaela K Silva Flávia Heinz Feier Tomaz J M Grezzana-Filho Pablo D Rodrigues Alexandre de araujo Mario Reis Alvares-da-Silva Roberta c Marchiori cleber Rosito Pinto Kruel Marcio Fernandes chedid department of Liver Transplant and Hepatobiliary Surgery Unit Hospital de Clínicas de Porto AlegrePorto Alegre 90035-007Brazil department of Interventional Radiology Unit Hospital de Clínicas de Porto AlegrePorto Alegre 90035-007Brazil department of Gastroenterology and Hepatology Hospital de Clínicas de Porto AlegrePorto Alegre 90035-007Brazil

BAcKGROUND Hepatocellular carcinoma(Hcc)is an aggressive malignant neoplasm that requires liver transplantation(LT).despite patients with Hcc being prioritized by most organ allocation systems worldwide,they still have to wait for long *** therapies(LRTs)are employed as bridging therapies in patients with Hcc awaiting *** largely used in the past,transarterial embolization(TAE)has been replaced by transarterial chemoembolization(TAcE).However,the superiority of TAcE over TAE has not been consistently shown in the *** To compare the outcomes of TAcE and TAE in patients with Hcc awaiting *** All consecutive patients with Hcc awaiting LT between 2011 and 2020 at a single center were *** patients underwent LRT with either TAcE or *** patients also underwent percutaneous ethanol injection(PEI),concom-itantly or in different treatment *** choice of LRT for each Hcc nodule was determined by a multidisciplinary *** primary outcome was waitlist dropout due to tumor progression,and the secondary outcome was the occurrence of adverse *** the subset of patients who underwent LT,complete pathological response and post-transplant recurrence-free survival were also *** Twelve(18.5%)patients in the TAcE group(only TAcE and TAcE+PEI;n=65)and 3(7.9%)patients in the TAE group(only TAE and TAE+PEI;n=38)dropped out of the waitlist due to tumor progression(P log-rank test=0.29).Adverse events occurred in 8(12.3%)and 2(5.3%)patients in the TAcE and TAE groups,respectively(P=0.316).Forty-eight(73.8%)of the 65 patients in the TAcE group and 29(76.3%)of the 38 patients in the TAE group underwent LT(P=0.818).Among these patients,complete pathological response was detected in 7(14.6%)and 9(31%)patients in the TAcE and TAE groups,respectively(P=0.145).Post-LT,Hcc recurred in 9(18.8%)and 4(13.8%)patients in the TAcE and TAE groups,respectively(P=0.756).Posttransplant recurrence-free survival was simila

关键词： Hepatocellular carcinoma Transarterial embolization Transarterial chemoembolization Liver transplantation Locoregional therapy Bridging

Antimicrobial Activity, Structural, crystallographic and Thermal characteristics of Alpha-Titanium Phosphate Promoted by Silver Ions

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Materials Sciences and Applications 2024年第8期15卷 253-269页

作者： Enzo Erbisti Garcia Agnes Maria cupertino Fernandes araujo Gerson Alberto Valencia Albitres Daniela de França da Silva Freitas Danielle Mattos Mariano carlos Magno Fialho Soares Sibele Piedade cestari Marco Antônio Lemos Miguel Luis claudio Mendes Institute of Macromolecules Professora Eloisa Mano Federal University of Rio de Janeiro Avenida Horacio Macedo 2030 Centro de Tecnologia Bloco J Ilha do Fundo Rio de Janeiro Brazil Institute of Microbiology Paulo de Ges Federal University of Rio de Janeiro Centro de Ciencias da Saude Bloco I Ilha do Fundo Rio de Janeiro Brazil Innovation in Polymer Engineering (PIEP) University of Minho Guimares Portugal

The recent global spread of the pandemic underscores the necessity of seeking new materials effective against microorganisms. Nanotechnology offers avenues for developing multifunctional materials. In this study, alpha-titanium phosphate (α-TiP) nanoparticles were synthesized and treated with silver salt to enhance their antimicrobial properties. The physicochemical characteristics and antimicrobial activity were evaluated. It was revealed by X-ray diffraction analysis that the structural integrity of α-TiP was influenced by ethylenediamine and silver ions. Distinct degradation profiles for each chemical modification were shown by thermogravimetric analysis. Infrared spectroscopy detected shifts and new absorption peaks in the spectra depending on the type of modification. Energy dispersive spectroscopy confirmed the disaggregation of α-TiP galleries following the addition of silver salt, which increased their effectiveness against microorganisms. Notably, only the sample treated with silver ions exhibited antimicrobial action. Antimicrobial activity was tested against the bacteria of medical importance Escherichia coli, Salmonella Enteritidis, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, Listeria momocytogenes and the yeast candida albicans. All microorganisms were inhibited by sample containing silver. Minor inhibition was observed against the Gram-positive bacteria L. monocytogenes and Bacillus cereus, while the greatest inhibition occurred against the fungus (yeast) c. albicans. The results revealed a potential application of the nanoparticles for control of microorganisms in public health.

关键词： Titanium Phosphate Silver Nitrate Antimicrobial Action