维普中文期刊产品整合服务
6篇 您的检索式:作者名="J.Alvarez"
    题名 作者 年代 出处 被引量
1应用数字图象处理技术对颜面审美观的研究显示文摘目的 本研究使用可调式数字图象模型比较美国正畸医师与中国普通人对颜面的审美观是否一致。对标准比较法和配对比较法这两种容貌美学评判方法的有效性也进行了比较。方法 由一张正常中国成人的头颅侧位片经处理产生四幅不同的数字图象构成一个系列。这些图象的骨骼或牙齿与正常值相差 2倍标准差 ,软组织侧貌图象则经相应软件处理产生。结果 一系列非参数检验证实数字变形模型的有效性 ,且配对比较法优于普通的标准比较法。专业和非专业人士都认为和谐或“正常”型最具吸引力 ,其次是“直面”或双颌后缩的男性中国人、“前部发育不足”或上颌后缩的女性中国人。研究发现牙齿后缩而骨骼型协调的男性与上颌后缩而余无异常的女性同“双牙弓前突”的正常型具有同样的吸引力。结论 本研究有利于中外正畸医师在治疗中国患者时有所依据 ,以达到医患均满意的治疗效果。Anthony L.Maganzini 曾应魁 Josh Z.Epstein Luis J.Alvarez 邹冰爽 曾祥龙 2000口腔正畸学2000,7,3:16
2纳米Fe^0粒子对产乙烯脱卤菌群脱氯性能和多样性影响研究显示文摘为探讨纳米Fe0粒子对产乙烯脱卤菌群脱氯性能和物种多样性的影响,采用纳米Fe0粒子与产乙烯脱卤菌群联合脱氯,并通过气相色谱、PCR-DGGE和TEM等技术手段进行相关表征.结果表明:当纳米Fe0粒子浓度为0~0.50 g·L-1时,体系的脱氯速率提高较小,低于40%,且菌种数量无明显变化;当其浓度为0.50~1.00 g·L-1时,体系的脱氯速率由0.31μmol·h-1提高到0.77μmol·h-1,体系的脱氯速率提高了60%,部分DGGE条带消失,多样性减少.TEM结果显示,产乙烯脱卤拟球菌在与纳米Fe0粒子接触部位有轻度破损,但细胞没有破裂.纳米Fe0粒子浓度较高时对产乙烯脱卤菌群的脱氯有明显的促进作用,但会使产乙烯脱卤菌群物种多样性减少.王振虹 葛兴彬 王雅楠 孙馨 李铁龙 修宗明 Pedro J.Alvarez 2014环境科学学报2014,34,6:2
3Adsorption of tetracycline on single‐walled and multi‐walled carbon nanotubes as affected by aqueous solution chemistry显示文摘LiangliangJi WeiChen JunBi ShourongZheng ZhaoyiXu DongqiangZhu Pedro J.Alvarez 2010Environmental Toxicology and Chemistry2010,,12:1
4Schottky photodiode using submicron thick diamond epilayer for flame sensing显示文摘The sensing of a flame can be performed by using wide-bandgap semiconductors, which offer a high signal-to-noise ratio since they only response the ultraviolet emission in the flame. Diamond is a robust semiconductor with a wide-bandgap of 5.5 e V, exhibiting an intrinsic solar-blindness for deep-ultraviolet(DUV) detection. In this work, by using a submicron thick boron-doped diamond epilayer grown on a type-Ib diamond substrate, a Schottky photodiode device structure- based flame sensor is demonstrated. The photodiode exhibits extremely low dark current in both forward and reverse modes due to the holes depletion in the epilayer. The photodiode has a photoconductivity gain larger than 100 and a threshold wavelength of 330 nm in the forward bias mode. CO and OH emission bands with wavelengths shorter than 330 nm in a flame light are detected at a forward voltage of-10 V. An alcohol lamp flame in the distance of 250 mm is directly detected without a focusing lens of flame light.Y.Koide M.Y.Liao J.Alvarez M.Imura K.Sueishi F.Yoshifusa 2009Nano-Micro Letters2009,1,1:1
5Nanomaterials in the environment: Behavior, fate, bioavailability, and effects显示文摘Stephen J.Klaine Pedro J. J.Alvarez Graeme E.Batley Teresa F.Fernandes Richard D.Handy Delina Y.Lyon ShailyMahendra Michael J.McLaughlin Jamie R.Lead 2009Environmental Toxicology and Chemistry2009,,9:1
6Self-modulation and anomalous collective scattering of laser produced intense ion beam in plasmas显示文摘The collective interaction between intense ion beams and plasmas is studied by simulations and experiments,where an intense proton beam produced by a short pulse laser is injected into a pre-ionized gas.It is found that,depending on its current density,collective effects can significantly alter the propagated ion beam and the stopping power.The quantitative agreement that is found between theories and experiments constitutes the first validation of the collective interaction theory.The effects in the interaction between intense ion beams and background gas plasmas are of importance for the design of laser fusion reactors as well as for beam physics.K.Mima J.Fuchs T.Taguchi J.Alvarez J.R.Marques S.N.Chen T.Tajima J.M.Perlado 2018Matter and Radiation at Extremes2018,3,3:0
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费