量子纠缠和经典热光的关联成像

关联成像理论和实验证明了光可以用特殊的方式传递经典信息文章中将介绍纠缠光和热光的关联成像实验．并从理论上分析经典热光源和双光子纠缠源在关联性质上的差异。     

一个用于体外评价超声造影剂显影效果的系统（英文）

构建并评价了一个用于体外研究超声造影剂显影效果的系统,该系统包括一套数字化B型超声诊断仪Belson3000A、仿组织超声体模和用于图像量化分析的软件.制备了具有不同反射强度的仿组织超声体模,通过对这些体模材料超声成像,研究了B超系统的线性范围、参数设置和系统的重复性等.超声成像设置为：输出声功率为4.8 ～12.3mW,探头的中心频率为3.5MHz,总增益为50dB.利用该系统,对自制备的表面活性剂微气泡和一种商用造影剂进行了显影成像.结果表明超声图像的灰度值随声功率的增加而增大,强反射特性的超声体模成像时,这种增加趋势更明显.该系统适合用于体外评价超声造影剂的显影效果,为体外表征超声微气泡造影剂的显影能力提供了一种简单、有效、实时的评价方法.     

Cultural and linguistic influence on brain organization for language and possible consequences for dyslexia: A review

Current neuroimaging and neurophysiologic techniques have substantially increased our possibilities to study processes related to various language functions in the intact human brain. Learning to read and write influences the functional organization of the brain. What is universal and what is specific in the languages of the world are important issues. Most studies on healthy bilinguals indicate that essentially the same neural mechanisms are used for first and second languages, albeit with some linguistic and cultural influences related to speech and writing systems, particularly between alphabetical and nonalphabetical languages. Proficiency, age of acquisition, and amount of exposure can affect the cerebral representations of the languages. Accumulating data support the important role of working memory for acquiring high proficiency in the reading of native and second languages. It is proposed that longitudinal studies on second language acquisition are essential and that the specific problems related to second language learning in dyslexic children should have high priority.     

选通门无扫描3D成像激光雷达研究

文章提出一种改进的无扫描3D成像激光雷达方案,发射激光脉冲照亮视场,利用ICCD相机探测回波信号,采用了一种新型的相位探测技术,本方案优点是激光脉冲可以相对较宽,降低了对带宽要求.经过仿真分析,发射脉冲下降时间与选通门上升时间对归一化积分系数的影响极小,降低了对器件的要求,验证了方案可行性.     

组态软件在汽车维修实训教学中的应用研究

从汽车维修实训教学的现状入手,介绍了组态软件的定义和特点,并根据实训教学要求,确定了图形化示教系统的功能,制定出相应的组态开发流程。最后文章总结了图形化示教系统在实训教学中的价值。     

FluorChem Q凝胶成像分析系统在科研实验及教学中的应用

凝胶成像分析在生物及医药研究中已成为越来越重要的研究手段,对先进的FluorChem Q凝胶成像分析系统应用进行了初步阐述,该仪器运用到教学实践当中,使科研工作者对凝胶成像仪有进一步的了解,同时使得学生初步了解该仪器,提高学生的实践运用能力,达到理论与实践相结合的目的。     

The effect of low back pain on trunk muscle size/function and hip strength in elite football (soccer) players

ABSTRACT

Low back pain (LBP) is a common problem in football (soccer) players. The effect of LBP on the trunk and hip muscles in this group is unknown. The relationship between LBP and trunk muscle size and function in football players across the preseason was examined. A secondary aim was to assess hip muscle strength. Twenty-five elite soccer players participated in the study, with assessments conducted on 23 players at both the start and end of the preseason. LBP was assessed with questionnaires and ultrasound imaging was used to assess size and function of trunk muscles at the start and end of preseason. Dynamometry was used to assess hip muscle strength at the start of the preseason. At the start of the preseason, 28% of players reported the presence of LBP and this was associated with reduced size of the multifidus, increased contraction of the transversus abdominis and multifidus muscles. LBP decreased across the preseason, and size of the multifidus muscle improved over the preseason. Ability to contract the abdominal and multifidus muscles did not alter across the preseason. Asymmetry in hip adductor and abductor muscle strength was found between players with and without LBP. Identifying modifiable factors in players with LBP may allow development of more targeted preseason rehabilitation programmes.     

ATR-FTIR imaging of albumen photographic prints

The preservation of early 20th century, late 19th century albumen prints is of great concern to collection managers and conservators of photographic materials. Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectroscopic imaging is presented for the first time as analytical methodology for the study of albumen photographs. This paper shows the feasibility of obtaining FTIR images of samples from albumen photographs with a high spatial resolution using a Ge ATR objective coupled with an infrared microscope. The improved spatial resolution compared to FTIR images obtained by the reflection method is due to the high refractive index of the ATR crystal, which gives a high numerical aperture and hence, a higher spatial resolution. The technique reveals detailed information on the organic functional group distribution in the individual layers of embedded cross sections and is used complementary to visual microscopy and scanning electron microscopy/energy dispersed X-ray spectroscopy. The main results of the study are discussed with regard to their historical and artistic significance, and they are compared with data from historical and conservation literature.     

评估普通人群肝脂肪变性磁共振成像定量方法的可行性

为了探讨采用3T西门子MRI LiverLab评估普通人群志愿者肝脏脂肪含量的可行性,招募了60名志愿者,其中双回波Dixon技术预测肝脂肪变性的患病率为51.7％(31/60),多回波Dixon和多回波HISTO技术测量的平均肝脏质子密度脂肪分数分别为(9.1±1.9)％和(9.3±2.3)％,测量结果在统计学上没有...     

人体骨骼肌含量测定方法综述

骨骼肌是组织-器官层次上最大的身体组分,也是一切体力活动的物质基础。现在已有若干基于性质或基于组分的方法,能够在活体测定身体的骨骼肌含量。计算机体层摄影（CT）与磁共振（MRI）这两种技术可以作为校验新方法的标准。最新发展的基于双能量X-射线吸收技术（DXA）的方法,可以替代CT及MRI,准确地测定活体的全身骨骼肌含量。