共焦扫描激光显微镜

介绍一台我们设计,研制的共焦扫描激光显微镜,它由共焦显微镜光学系统、信号探测成像系统以及物扫描平台驱动装置组成。光学系统设计有两条光路,便于共焦调节,可采用反射,透射和偏振３种方式,也可进行荧光成像。     

激光共聚焦扫描显微镜观测自噬小体变化的应用

文章探讨激光共聚焦扫描显微镜技术在检测低氧诱导小鼠心肌细胞损伤自噬小体变化的应用价值.在无菌条件下,取胚胎型小鼠心肌细胞备用.采用低氧环境+缺氧液方法诱导心肌细胞损伤并发生自噬现象作为实验组,正常环境下培养细胞的方法作为对照组.待心肌细胞长到一定程度后,分别利用激光共聚焦扫描显微镜和正置荧光显微镜对免疫荧光染色的自噬小体表达的LC3A/B蛋白情况进行观测并比较2种检测方法的优缺点.结果显示利用低氧环境+缺氧液方法诱导小鼠心肌细胞损伤并自噬小体形成是可行的.与正常对照组比较,低氧缺氧诱导小鼠心肌细胞损伤组(实验组)自噬小体呈高表达状态.与普通型正置荧光显微镜比较,激光共聚焦扫描显微镜成像速度快,一次可以获得多副图像且图像清晰.激光共聚焦扫描显微镜技术具有成像速度快、灵敏度高和精确度高等优点,可以实时、准确观测低氧诱导小鼠心肌细胞损失自噬小体的表达情况,具有重要临床应用价值.     

生物学共聚焦显微镜使用手册

目前共聚焦显微镜在生物学领域已被广泛应用。本手册对共聚焦显微镜做了全方位的立体介绍。作为经典书籍的第三版，该书分52章，详细深入地介绍了显微镜的各个部件、数字化采图、荧光染料的使用、3D样品的准备以及共聚焦显微镜的理论极限。同时还介绍了荧光定量共聚焦成像在实践上的复杂性。     

迈克尔孙干涉图样分析及调节技巧

阐述了迈克尔孙干涉仪的原理,并针对迈克尔孙干涉仪的光路及调节过程中出现的干涉图样进行了分析,总结出了迈克尔孙干涉仪实验中的一些调节技巧,对学生在对迈克尔孙干涉仪进行有效而准确的调节有一定的指导作用.     

激光共聚焦扫描显微镜技术在食品领域中的应用

该文介绍了激光共聚焦扫描显微镜的特点及原理,重点对其在食品领域中的发展和应用概况进行了综述。该技术在研究食品的微观组织结构及变化有独特的优势。     

多重量子点编码微球的高效制备与表征

选取了中心发射波长分别为528、597nm的2种CdSSe@ZnS量子点,采用了聚(苯乙烯-马来酸酐)(PSMA)介导法将上述量子点均匀、高效装载进入介孔聚苯乙烯微球(MPS)的孔道内,通过调节2种量子点的掺杂量,成功制备了一系列具有不同荧光特性的编码微球.利用扫描电子显微镜、荧光分光光度计、激光共聚焦荧光显微镜及流式细胞仪对制备得到的系列编码微球的性能进行了表征.结果表明:制备得到的编码微球可均匀分散于水相体系,其荧光分布均匀且微球间量子点荷载密度较为一致,有利于提高编码能力,同时通过2种量子点的有效组配实现了双色荧光的高精准编码与解码分析.     

直升机旋翼共锥度测量系统设计

采用激光技术实现直升机旋翼共锥度测量具有结构简单、测量快速和精度高等特点.介绍了采用直升机旋翼切割激光方法进行直升机旋翼共锥度测量的基本原理及实现方法,在原有测量方案基础上,采用分光镜设计了一种新型光路结构,并对测量系统的激光光路、信号采集处理和上位机软件处理等组成部分的实现方法进行了详细介绍.经过模拟试验,所设计的系统满足测量要求,运行稳定.     

激光干涉仪测量机床精度的准直调节技巧

激光干涉仪具有测量速度快、测量精度高、测量范围大、分辨力高等优点。随着数控机床的广泛应用,使用激光干涉仪对数控机床进行定位精度检测,已经成为公认的检测方法。在检测的准备过程中,准直光路通常会占用较长的时间,介绍一种快速准直光路的测量技巧,通过综合规划三轴测量先后顺序,充分利用已经调好的光路准直条件,快速有效地调节有90°光路旋转轴的测量准直工作,节省了工作时间,提高了工作效率。     

双光子共聚焦显微镜FV1000 MPE的组成与维护探讨

FV1000 MPE是结合了激光扫描共聚焦显微镜和双光子激发技术的扫描成像系统。广泛应用于生物学、生物医学等科学研究中。双光子共聚焦显微镜的组成及维护等对初学者来说比较复杂,从配置和维护中重要的问题展开讨论,为双光子共聚焦显微镜的使用者和管理者提供参考。     

激光扫描共聚焦显微成像技术与应用

激光扫描共聚焦显微镜已成为生物及医学等领域重要的研究手段。为了更充分、灵活地运用共聚焦显微镜的功能,提高仪器应用效果,拓展仪器使用需求,该文以尼康A1+共聚焦显微镜为例,介绍了共聚焦显微镜的基本原理、仪器配置和技术参数,样品制备要求,图像采集操作规程及技巧,日常维护和管理等方面信息。旨在为科研工作者获取高质量共聚焦图像提供有力的技术支持,提高工作效率,更好地服务于教学和科学研究。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.