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Phase Formation and Magnetic Properties of Nanocomposite Nd-Fe-B Adjusted by Small Amount of dy and Co

Journal of rare Earths 2004年第z2期22卷 89-94页

作者： t S Jang t W Lim H S Aum D H Lee M B kim Division of Materials and Chemical Engineering Sun Moon UniversityKorea Division of Materials and Chemical EngineeringSun Moon UniversityKorea Division of Mechanical EngineeringSun Moon University 100 Kalsan LiTangjung MyonAsan CityChoongnam 336-708Korea Division of Materials and Chemical EngineeringSun Moon UniversityKorea Division of Materials and Chemical EngineeringSun Moon UniversityKorea

In order to improve and stabilize the magnetic properties of nanocomposite Nd2Fe14B/α-Fe magnetic alloys by a compositional adjustment, small amount of dy and/or Co was added to Nd9Fe84B7 alloys. DtA analysis on the amorphous of the alloys took place as the soft magnetic phases were crystallized, and then the hard magnetic Nd2Fe14B was precipitated from them. While α-Fe and a metastable 1:7 (tbCu7-type) phase were formed simultaneously in dy and Co-free alloys, they were crystallized separately at different temperatures after dy or Co was added. this phase separation occurred more clearly in the dy-treated alloys and the other soft magnetic phase Fe3B was also stabilized by dy and/or Co. the 1: 7 phase that was stabilized by dy and/or Co was not eliminated at 700 ℃, decreasing magnetic properties of the alloys. It was eventually disappeared above 725 ℃, but Fe3B was not eliminated even at 750 ℃ when dy was added more than 0.5 at% or Co was added more than 2.0 at%. Amount of Nd2Fe14B in the alloys tended to increase as dy addition increased,whereas Co addition did not lead to any appreciable change in the ratio of α-Fe and Nd2Fe14B. Moreover, dy addition apparently increased coercivity of an alloy while Co addition had a beneficial effect on remanence. the grains in the dytreated alloys were usually finer than those in the Co-treated alloys. the grain size of both α-Fe and Nd2Fe14B in the alloys exhibiting mr ≥ 0.72 was in the range of 20 ～ 40 nm or even larger 50 nm, which is larger than the theoretical optimum size ( ～ 10 nm). typical magnetic properties obtained from a Nd7.5dy1.5Fe82.5Co1.5B7 alloy annealed for 12 min at 725 ℃were iHc=4.85 kOe, Br= 11.32 kG, (BH)max = 15.73 MGOe, and mr=0.73.

关键词： nanocomposite Nd-Fe-B magnetic properties remanence coercivity

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原子团簇气体吸收高强度激光

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强激光技术进展 1998年第2期8卷 27-31页

作者： Ditmi.,t Smit.,ra

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Does climate change alter the nutrient trends of Cedrela fissilis *** in the southern Brazilian Amazon?

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Ecological Processes 2023年第1期12卷 806-827页

作者： Daigard R.Ortega Rodriguez raúl Sánchez-Salguero Andrea Hevia Renata C.Bovi Marciel J.Ferreira James H.Speer Fidel A.Roig Mario tomazello-Filho Escola Superior de Agricultura Luiz de Queiroz Departamento de Ciências FlorestaisUniversidade de São PauloAv.Pádua Dias 11PiracicabaSão Paulo 13418-900Brazil DendrOlavide-Department Sistemas Físicos Químicos y NaturalesUniversidad Pablo de OlavideCrta.Utrera Km.141013 SevilleSpain Department of Ecology Universidad de JaénCampus Las Lagunillas s/n.23009 JaénSpain Departamento de Ciência Florestal Solos e AmbienteUniversidade Estadual PaulistaAv.Universitária 3780BotucatuSão Paulo 18610-034Brazil Laboratory of Silviculture Universidade Federal do Ama-zonasAv.Gen.Rodrigo Octávio 6200ManausAmazonas 69080-900Brazil Department of Earth and Environmental Systems Indiana State UniversityTerre MauteIN 47809USA Argentine Institute of Nivology Glaciology and Environmental Sciences(IANIGLA CONICETUniversidad Nacional de Cuyo)5500 MendozaArgentina Hémera Centro de Observación de la tierra Escuela de Ingeniería ForestalFacultad de CienciasUniversidad MayorSantiagoChile

Background the increase in the frequency and intensity of droughts is pointed out as one of the main factors altering biogeochemical cycles in the Amazon *** eco-nutritional approach using X-ray fluorescence micro-analysis(μXRF)is proposed to verify the long-and short-term effects of droughts on the growth and xylem nutrient concentrations of Cedrela fissilis *** Fourteen radii were selected from a tree-ring width chronology and X-rayed by Itrax *** of ring width,wood density,and concentrations of aluminum(Al),phosphorus(P),sulfur(S),calcium(Ca),potassium(k),manganese(Mn),iron(Fe)and strontium(Sr)together with Al/Ca,Ca/Mn,k/Ca,Sr/Ca and Mn/S ratios were constructed and correlated with precipitation,temperature,the difference between precipitation and potential evapotranspiration(P-PEt)and standardized precipitation-evapotranspiration index(SPEI).Results During dry years,*** showed narrower,less dense rings,lower Al,P,S and Ca,and higher k and Fe concentrations(the opposite was found in wet years).Ring width decreased(together with Al,P,S,k,Ca,Mn,Fe,Sr,Al/Ca,k/Ca and Sr/Ca)and wood density increased(together with Ca/Mn and Mn/S),which was associated with an increase in evapotranspiration and temperature over time,mainly since *** fissilis showed a tendency to increase its capacity for resistance,and a recovery and resilience in growth over time associated with responses in Al,Ca,P and ***,it showed a risk in the capacity for recovery of the pre-drought density values,associated with unsatisfactory responses in Al,Ca,k,Fe and *** this study is the first attempt to analyze tree-ring nutritional evidences of *** trees to climate sensitivity and resilience to drought,based on long-term data from seasonal moist tropical forests of the *** data suggested that *** is undergoing alterations in the concentration,use and redistribution of nutrients associated with increasing wood density and d

关键词： Dendrochemistry μXRF Drought tropical tree Eco-chemical indicator Resilience Resistance Recovery

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采用蛋白指纹图谱技术筛选大肠癌肝转移特异性相关蛋白

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中国组织工程研究与临床康复 2007年第9期11卷 1632-1635页

作者：崔丹瑜姜泊王继德李霆吴保平南方医科大学南方医院消化内科广东省广州市510515

目的:应用表面增强激光解析电离飞行时间质谱技术从大肠癌及大肠癌肝转移患者中筛选出大肠癌肝转移患者血清特异性相关蛋白。方法:实验于2005-07/2006-09分别在南方医院消化中心实验室与解放军第一五○医院实验室完成。应用美国CipherGe... 详细信息

目的:应用表面增强激光解析电离飞行时间质谱技术从大肠癌及大肠癌肝转移患者中筛选出大肠癌肝转移患者血清特异性相关蛋白。方法:实验于2005-07/2006-09分别在南方医院消化中心实验室与解放军第一五○医院实验室完成。应用美国CipherGen公司IMAC3(ImmobilizedMetalAffinityCapture,金属亲和表面)芯片和蛋白芯片仪检测44例大肠癌患者及36例大肠癌肝转移患者血清中的蛋白质相对含量。设定所有血清样本检测的蛋白质相对分子质量区间在1500～20000。利用PBSⅡ型蛋白质芯片阅读仪对IMAC3芯片进行检测,所得到的蛋白质以波谱的形式表示。采用BiomarkerWizard软件对2组血清在相同质荷比的蛋白质含量数据进行方差分析,将分析所得到的含量有显著性差异(PkerPattern智能统计分析软件,选择相应条件,对其进行分组统计,从而得到能够正确分组的特异性蛋白标志物并构建大肠癌肝转移的诊断模型。采用酶联免疫法检测相同血清标本中的CEA水平,与构建的诊断模型在大肠癌肝转移诊断中作比较。结果:①44例大肠癌患者与36例大肠癌肝转移患者的血清蛋白质在质荷比为2685.64～11813间有16个蛋白质含量有显著差异。②大肠癌组在质荷比为5909处的蛋白质的相对含量高于大肠癌肝转移组[(30.1±9.6)%,(14.5±10.4)%,P≤0.01]。③其中44例大肠癌患者中有38例患者被正确分组,36例大肠癌肝转移患者被正确识别,准确率为92.5%(74/80),灵敏度和特异性分别为100%(36/36),86.4%(38/44)。结论:表面增强激光解析电离飞行时间质谱技术快速、准确、灵敏度、特异性高,通过蛋白芯片仪发现的特异性相关蛋白,有望成为大肠癌肝转移诊断中有应用价值的临床检测指标。

关键词：大肠癌肝转移生物标志物蛋白指纹图谱表面增强激光解析电离飞行时间质谱

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血管支架内再狭窄相关因素与机制的研究进展

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中国组织工程研究与临床康复 2007年第35期11卷 7061-7064页

作者：贾东煜王贵学重庆大学生物工程学院生物力学与组织工程教育部重点实验室重庆市400044

学术背景:血管支架作为一种有效治疗心脑血管硬化手段得到广泛的研究和应用,但血管支架内再狭窄的发生不能避免。因此对血管支架内再狭窄机制的研究就显得尤为必要。目的:阐述血管支架本身及其他相关因素对支架内再狭窄的影响,并提出血... 详细信息

学术背景:血管支架作为一种有效治疗心脑血管硬化手段得到广泛的研究和应用,但血管支架内再狭窄的发生不能避免。因此对血管支架内再狭窄机制的研究就显得尤为必要。目的:阐述血管支架本身及其他相关因素对支架内再狭窄的影响,并提出血管支架内再狭窄机制的传统观点和新观点。检索策略:应用计算机检索PubMed数据库1999-01/2007-07的相关文章,检索词"vascular,mechanism,restenosis,in-stent restenosis(ISR)"并限定文章语言种类为English。同时计算机检索中文科技期刊数据库(中国期刊网CNkI)1999-01/2007-03的相关文章,检索词"血管、机制、再狭窄、支架内再狭窄",限定文章语言种类为中文。对资料进行初审,纳入标准:①血管支架的研究现状。②血管支架内再狭窄机制的研究现状及展望。排除标准:重复性研究。然后查找余下文章的全文,进一步判断与纳入标准一致的文章。同时手工检索有关介入治疗起源与发展的文章3篇。共检索到文献147篇,其中外文138篇,与再狭窄机制研究相关的30篇;中文文献9篇,根据重复文献排除标准,2篇被应用。文献评价:所选用文章32篇,2篇为综述,其余均为临床与实验研究。资料综合:①血管支架的设计、材料及临床应用影响着支架内再狭窄的发生。②内皮细胞功能影响支架内再狭窄的发生。③组织因子的暴露刺激血栓的形成,导致支架内再狭窄。④新生内膜的形成引起支架内再狭窄。⑤支架内再狭窄后期的血管重构进一步促进再狭窄发生。结论:血管支架内再狭窄与多种因素有关,开发良好的新型支架有可能避免和减少再狭窄的发生。

关键词：血管机制再狭窄支架内再狭窄

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Cutaneous Dengue Virus Inoculation triggers Strong B Cell Reactions but Contrastingly Poor t Cell Responses

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Virologica Sinica 2020年第5期35卷 575-587页

作者： Edith Marcial-Juárez Julio García-Cordero raúl Antonio Maqueda-Alfaro rafael Eduardo Saucedo-López Luvia Enid Sánchez-torres Leticia Cedillo-Barrón Leopoldo Flores-Romo Department of Cell Biology Center for Advanced Research(CINVESTAV-IPN)The National Polytechnic Institute07360 Mexico CityMexico Department of Molecular Biomedicine Center for Advanced Research(CINVESTAV-IPN)The National Polytechnic Institute07360 Mexico CityMexico Immunology Department The National School of Biological Sciences(ENCB-IPN)The National Polytechnic Institute11340 Mexico CityMexico

Dengue is a global health problem without current specific treatment nor safe vaccines *** severe dengue is related to pre-existing non-neutralizing dengue virus(DENV)antibodies,the role of t cells in protection or pathology is *** cutaneous DENV infection in immunocompetent mice we previously showed the generation of PNA+germinal centers(GCs),now we assessed the activation and proliferation of B and t cells in draining lymph nodes(DLNs).We found a drastic remodelling of DLN compartments from 7 to 14 days post-infection(dpi)with greatly enlarged B cell follicles,occupying almost half of the DLN area compared to*24%in na?ve *** clusters of proliferating(ki-67+)cells inside B follicles were found 14 dpi,representing*33%of B cells in DLNs but only*2%in noninfected *** GCs,we noticed an important recruitment of tingle body macrophages removing apoptotic *** contrast,the percentage of paracortex area and total t cells decreased by 14–16 dpi,compared to *** randomly distributed ki-67+t cells were found,similar to non-infected ***69 expression by CD4+and CD8+t cells was minor,while it was remarkable in B cells,representing 1764.7%of change from basal levels 3 *** apparent lack of t cell responses cannot be attributed to apoptosis since no significant differences were observed compared to noninfected *** study shows massive B cell activation and proliferation in DLNs upon DENV *** contrast,we found very poor,almost absent CD4+and CD8+t cell responses.

关键词： Dengue virus(DENV) B and t cells proliferation Lymphocyte activation Lymph nodes In vivo cutaneous infection Immunocompetent mice

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基于影像组学、视觉和直方图评估证实冠状动脉Ct血管成像上动脉粥样硬化病变的体外研究

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国际医学放射学杂志 2019年第6期 735-736页

作者： M.kolossváry J.karády Y.kikuchi A.Ivanov C.L.Schlett M.t.Lu 许棚棚 MtA-SE Cardiovascular Imaging Research Group Heart and Vascular Center Semmelweis University

摘要目的以组织学检查确定的晚期动脉粥样硬化病变为诊断标准,在体外冠状动脉Ct血管成像基础上,比较基于影像组学的机器学习方法与基于视觉和直方图评估方法

关键词：冠状动脉机器学习模型动脉粥样硬化病变 Ct 影像组学体外研究直方图

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齿状突骨折（英文）

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影像诊断与介入放射学 2018年第6期27卷 492-493页

作者： Novelline ra Rhea Jt Ptak t 关键中山大学附属第一医院医学影像科广东广州510080

key Facts Synonyms:Odontoid fracture and dens fracture are ***:the odontoid of C2 is the axis about which C1 *** imaging appearance:Most frequent,over 60%,is the typeⅡFracture;typeⅠis rare.

关键词：齿状突骨折 syn is

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the influence of porosity on tablet subdivision

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Particuology 2020年第6期18卷 192-196页

作者： Maira t.teixeira Livia L.Sa-Barreto Izabel C.Silva tais Gratieri Guilherme M.Gelfuso Ricardo N.Marreto Mariana Landin Marcilio Cunha-Filho Laboratory of Food Drugs and Cosmetics(LTMAC)University of Brasilia(UnB)70910-900 BrasiliaDFBrazil Laboratory of Nanosystems and Drug Delivery Devices(NanoSYS) Federal University of GoiasGoianiaGO.Brazil Departamento de Farmacologia Farmacia y Tecnologia Farmaceutica1+D Farma Group(Gl-1645)Universidade de Santiago de CompostelaSpain

A tablet microstructure,especially the porosity,is a crucial parameter that influences the mechanical ***,tablet subdivisions were studied as a functi on of tablet *** tablets were manufactured in the presenee of different diluents,namely microcrystalline cellulose,LudipressR,or lactose ***,the add让ion of Camphor was investigated,which was thereafter sublimated with a view of obtaining tablets having varying degrees of *** assays were corre lated to the subdivision performs *** increase in porosity reduced the hardness and increased the tablet friability,adversely impacting the *** all the excipients,an increase in relative porosity>90%represented the threshold level from which an inadequate subdivision *** in crease in tablet porosity led to a reduction in mechanical resista nee,which,combined with a heterogeneous and disc on tinuous distribution of pores within the matrix,resulted in poor subdivision *** trolling tablet porosity is an important consideration when designing tablets having a subdivision purpose.

关键词： tablet subdivision Porosity Mass variation Mass loss Friability Hardness

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Splenic trauma脾外伤

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影像诊断与介入放射学 2020年第2期29卷 138-139页

作者： Novelline ra Rhea Jt Ptak t 关键(编写) 不详中山大学附属第一医院医学影像科广东广州510080

key Facts Definition:Damage to the splenic parenchyma or splenic vessels secondary to blunt or penetrating *** is most commonly injured organ following blunt *** injury accounts for about 40%of patients with blunt organ *** management possible in about 60%of *** of nonoperative management increases with grade of *** only finding at Ct may be perisplenic blood.

关键词：脾外伤 operative trauma

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