166 research outputs found

    Sublime Hunger: A Consideration of Eating Disorders Beyond Beauty

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    n this paper, I argue that one of the most intense ways women are encouraged to enjoy sublime experiences is via attempts to control their bodies through excessive dieting. If this is so, then the societal-cultural contributions to the problem of eating disorders exceed the perpetuation of a certain beauty ideal to include the almost universal encouragement women receive to diet, coupled with the relative shortage of opportunities women are afforded to experience the sublime

    半导体激光二极管泵浦双偏振四波长掺钕钒酸钇薄片激光

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    报道了半导体激光二极管泵浦四波长同时激射的双偏振c轴切割掺钕钒酸钇薄片激光器件.激光器的起振为11mW,光-光转换效率大于26.5%,在40mW的LD泵浦下输出12mW的1.06μm激光总功率.同时,研究该激光晶体结构及其薄片晶体的4F3/2→4I11/2跃迁荧光发射光谱,阐明多波长同时激射与双偏振产生的物理机制

    钛宝石激光端面泵浦钕掺杂钒酸钇薄片激光器

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    报道了采用σ偏振钛宝石激光端面泵浦a切割掺钕钒酸钇薄片激光器中的偏振热透镜补偿特性研究,在常温下获得2mW低阈值、大于50%的高光-光转换效率的连续基横模运转,在880mW注入泵浦功率下,输出440mW的TEM00模激光.同时,研究了随着泵浦功率的增加,激光的纵模演化特性.结果表明,以σ偏振泵浦时,π偏振的1.064μm激光功率相对波动度小于1%

    唤醒水平与成年人记忆年龄差异关系的初步研究

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    青年与老年被试在分心与非分心条件下进行了指向记忆和逻辑故事回忆作业,同时记录了心率、指端血容和皮电等外周植物神经系统指标,以探讨成年人记忆的年龄差异与唤醒水平的关系。结果看到老年组记忆成绩明显低于青年组,同时在非分心作业时老年组血容变化率与记忆成绩明显相关,支持老年人认知成绩较差的原因是由于唤醒水平过低的假说。但在分心条件下老年组唤醒水平高于非分心条件,表明老年人唤醒水平高低可能随作业的复杂程度而变化。</p

    新型激光技术研究进展

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    重点介绍了过去10年来厦门大学光电子技术研究所在高Q值玻璃球微腔光子学、光纤激光器、平面波导的交错复用器设计和固体激光器研究中所取得的进展情况.特别重点讨论了在光纤激光器领域所开展的研究内容以及取得最新进展:如利用掺Yb双包层光纤激光器泵浦的2级P2O5拉曼级联获得了瓦级1 480 nm输出的拉曼光纤激光器;实现了O波段多波长磷硅拉曼光纤激光器;提出并利用双泵浦光纤参量放大器作为激光增益介质,在国际上率先实现了光通信波段(1 550 nm)多波长、窄线宽光纤参量振荡器;采用光纤激光器腔内参量泵浦技术,获得了C+L波段的高性能光纤参量放大器.同时对球微腔激光器也进行了较为详尽的讨论

    Experimental Teaching of the Rapid Prototype Manufacturing Technology Based on ATOS Measuring System

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    根据目前传统的机械设计与制造的实验教学现状,提出了先进制造技术领域的反求工程(RE)和快速原型(RP)相结合的课程实验,给出了实施方案。实践证明:学生利用ATOS三维扫描仪、FDM熔丝堆积成型机以及相关的Surfacer、PRO/E软件平台,不仅能够很快地了解到产品快速开发技术的新理念,而且学会了利用RE与RP相结合技术进行产品的快速复制实验的新方法、新工艺。Based on the present experimental teaching of the traditional mechanism design and manufacture,this paper put forward an implementation scheme using reverse engineering and rapid prototype manufacturing technology.The practice proved that,by using the hardware resource of ATOS and FDM as well as the software platform of Surfacer and Pro/E,student can not only apprehend the new concept of the quick product-developed technology but also learn the new technics and method of using RE and RP to experiment copying 3D model.厦门市重点产学研基金资助项目:高档新型出水器快速制造新技术研发(编号:厦经技[2004]332

    石英玻璃微球吸收光谱上的结构共振

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    通过CO2激光器熔融不同直径的熔锥光纤以得到相应直径的石英玻璃微球,利用此微球和熔锥光纤,构造了球微腔耦合系统。实验中利用光腰直径为3.1μm的熔锥光纤与直径为143.1μm的石英玻璃微球进行耦合,通过最大分辨力为1pm的可调谐半导体激光器对该耦合系统进行光谱扫描,发现石英玻璃微球的吸收光谱中出现分立的结构共振峰。利用光学微球腔理论讨论了石英玻璃微球吸收光谱中的结构共振,并用米氏散射理论公式对一阶TE模共振峰的位置以及它们的间隔进行了计算,共振峰位置实验结果与理论结果的误差仅为0.03%,表明实验与计算结果相符

    Research on facial spectrum and color characteristics of five-zang disease status

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    目的:观察疾病状态人群面色光谱色度情况,为疾病状态五脏病评价提供可供依据。方法:采用日产柯尼卡美能达CM-2600d分光测色仪,观测健康组(183例)、疾病组(370例)额部、眉间部、鼻部、下颏、左右颧部、左右眼胞8处明亮度l、红光度A、黄光度b、饱和度C值及波长段(400~700nM)下的面色反射率值等指标,并据中医理论对疾病状态进行五脏病位分析。结果:疾病组l值显著低于健康组,b、C值均显著高于健康组;疾病组各波长段下反射率显著低于健康状态组(P<0.05)。疾病组除左右眼胞外的6个位点间的l、A、b、C值有显著性差异(P<0.05),不同点位有其特异性的色度变化特征。疾病组五脏病各组光谱色度特征比较有显著差异(P<0.05),结果与中医面部脏腑五色理论在一定程度上相符合。结论:运用光谱色度测定方法,可以作为诊断疾病状态五脏病的重要指标。Objective: To observe disease status facial spectrum and color,providing good quantitative basis for disease assessment.Methods: We gathered the facial color information in health(183) and disease groups(370) including L,a,b,C values and reflection of different wavelengths in 400-700nm with CM-2600D spectral photometric color measuring instrument on 8 points including frontal part,glabellas nose,mandible two cheeks and eye cells and analysized disease status five-zang positioning according to the principle of TCM syndrome differentiation.Results: L value of Disease group was lower than health status group and b,C values were higher than health status group,reflection of different wavelengths of disease group were lower than health group(P<0.05).6 points in disease group between loci L,a,b,C values with varying degrees of significant differences(P<0.05).Different point had its own specificity facial complexion variation characteristics.Facial spectrum and color of each five-zang disease group had significant difference through comparion of facial complexion.To a certain extent the result was consistent with TCM facial organs Five-color theory.Conclusion: There existed diagnostic value in distinguishing five-zang disease status in some degree by spectral photometric color measuring technique.国家科技支撑计划(No.2012BAI37B06);国家高技术研究发展计划(863计划)资助项目(No.2008AA02Z407);国家自然科学基金资助项目(No.30873463;No.81173200);国家自然基金青年项目(No.81102558);上海市重点学科(第三期)建设项目(No.S30302;No.S30303)---

    成年期心理健康状况的比较研究——“自编心理健康问卷”的试用

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    试用“自编心理健康问卷”,对初中以上文化程度的780例20-85岁健康成年人的心理健康状况进行比较研究。该问卷包括五个分量表,结果可见:信度和效度基本合格;总量表和“认知”分随增龄而下降,年龄差异非常显著,“性格”和“情绪”分的年龄差异显著,而“人际交往”和“适应”分的年龄差异不显著。青年组的“认知”分高于其余三组,年老老年组的“总分”、“性格”和“情绪”分均低于其余三组,老年组除“认知”分下降外,其余各项与中、青年组差异不显著,提示年轻老年人心理健康状况保持良好,而年老老年人需要更多关心和照

    基于石墨烯可饱和吸收体的脉冲光纤激光器研究进展

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    单层石墨烯是一种具有独特电学及光学特性的二维碳材料,尤其是在光学应用方面,它对可见光到近红外波段范围内光波仅有2.3%的线性吸收.由于石墨烯的独特性质,使得它可以作为一种具有超快响应时间以及超宽带工作特性的可饱和吸收体.本综述将展开石墨烯的线性及非线性光学特性分析,并重点阐述基于石墨烯可饱和吸收体的调Q及锁模光纤激光器研究进展,并指出厦门大学光电子技术研究所近几年来在这一方面所取得的成果.国家自然科学基金(61275050);高等学校博士学科点专项科研基金(20120121110034
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