Results 21 to 30 of about 1,671 (154)

Verification and Application Case Analysis of the Methods of Increasing the TEM Image Contrast [PDF]

open access: yes, 2015
当前,透射电子显微镜(transmissionelectronmicroscope,简称TEM)已成为研究材料微观结构的重要仪器,在利用TEM获取微结构图像时,图像衬度低是较常出现的一个问题。目前鲜有文献针对这一问题开展全面性和系统性的讨论。本文对增加图像衬度的多种理论途径进行了实验验证,并讨论了不同典型低衬度样品的衬度改善方法,使TEM用户可根据实验条件和试样特点,选择有效的解决方案。 1、分别对物镜极靴、物镜光阑、低压电镜和高角度环形探测器等仪器方法以及染色技术 ...
许斌斌
core  

Tip Enhanced Dark-field microscopy [PDF]

open access: yes, 2015
表面等离激元(SurfacePlasmonPolaritons,SPPs)是一种由金属表面的自由电子与外界光子相互作用形成的表面电磁振荡模式。在空间上具有高度的局域性,可以突破衍射极限,实现亚波长尺度范围内光的传导与控制。同时也是金属表面电磁场增强的重要来源。理论与实验研究表明,当两个表面等离激元靠得很近时,会产生耦合作用,近场电磁场会重新排布,并在合适的距离范围内产生“热点”。表面等离激元之间的耦合有多种形式:纳米粒子之间耦合LSP-LSP,纳米粒子与金属薄膜之间的耦合LSP-SPP ...
王芳芳
core  

Effect of Low Voltage Electrostatic Field Assisted Thawing on Beef Quality [PDF]

open access: yes
To screen the suitable thawing method of frozen beef and better maintain its eating quality and flavor after unfreezing, in this paper, the strip loin frozen at −20 ℃ was taken as the research object, and the naturally frozen one was taken as the control
Huixin FU   +4 more
core   +1 more source

Probing metal complex by mass spectrometry [PDF]

open access: yes, 2016
金属配合物由于具有优异的物理和化学性质,如催化、分子识别、手性拆分、C-H活化、荧光和生物医学等,在最近引起了广泛的研究兴趣。金属配合物的各种物理或化学性质与其结构及化学组成密切相关,目前X-射线单晶衍射是金属配合物结构和化学组成的主要表征方法。然而,X射线衍射的方法无法明确分辨电子数相近的原子,且对于金属配合物结构上的某些无序位置,X射线衍射的方法无法准确地确定其化学组成。而质谱是基于质荷比(m/z)表征化合物在溶液状态下的化学成分的分析仪器。与X射线衍射相比 ...
苏海峰
core  

Effects of Low Voltage Electrostatic Field Combined with Low Temperature and High Humidity Thawing on Beef Tenderness and Water Retention [PDF]

open access: yes
To investigate the effects of a low-pressure electrostatic field combined with low temperature and high humidity on beef tenderness, this study utilized bovine longissimus dorsi muscle as the experimental material.
Chunhui ZHANG   +5 more
core   +1 more source

Effect of Low Voltage Electrostatic Treatment on the Quality of Hypsizygus marmoreus [PDF]

open access: yes
In order to explore the effect of low-voltage electrostatic field treatment on storage quality and shelf life of seafood mushrooms, this study set 24±1 ℃ room temperature storage as the control (CK), and used 4±1 ℃ low-temperature refrigeration (RG), low-
Jinfeng PAN   +4 more
core   +1 more source

Research on the Effects of Pulsed Field on Cell and The Cellular Dielectric Parameters [PDF]

open access: yes, 2017
近年来,随着电子和通讯技术的进步,电磁场对生命体的影响越来越受人们的关 注。其中,脉冲电场对细胞结构和功能的影响与对肿瘤细胞的消融作用逐渐成为近些 年生物电磁领域研究的热点。在脉冲电场作用下,细胞的形状,内部结构的电磁性质 会发生改变,甚至可以靶向性诱导肿瘤细胞凋亡、坏死。研究脉冲电场作用下细胞的 电响应及细胞内部导电、介电性质的改变对揭示电磁场生物效应的发生机制及肿瘤治 疗有着非常重要的意义。为此,本论文着眼于电磁场与细胞的相互作用,深入研究了 脉冲电场下细胞穿孔和细胞融合的机理 ...
刘琳英
core  

Study on the formation mechanism of gelation of konjac glucomannan [PDF]

open access: yes, 2016
利用直流电,在添加CaCl2、MgCl2、FeCl3、钨酸钠的条件下,分别制备了KGM-Ca、KGM-Mg、KGM-Fe、KGM-T凝胶,对获得凝胶后电处理KGM溶胶电极两侧pH进行了测试,并对KGM-T凝胶进行了FTIR、Raman、SEM、XRD、DSC表征。结果表明,正极附近KGM溶胶为酸性,负极一侧KGM溶胶为碱性。SEM表明KGM在粉末状态下,外表呈现规则的微纤维状,KGM分子间有氢键;KGM溶胶冻干后呈现大小孔洞不均匀的支架结构,直流电处理的KGM溶胶冻干后的扫描电镜没有发生明显的变化 ...
王丽霞
core  

Deterioration Mechanism of and Improvement Strategies for Frozen Meat [PDF]

open access: yes
During the freezing, storage, and thawing process, physicochemical changes occur in raw meat, which will inevitably lead to quality deterioration mainly including decreased water-holding capacity and the deterioration of color and texture.
LIU Jiaqi, WANG Huiping, Zhang Xin, KONG Baohua, CHEN Qian
core   +1 more source

标准电容器静电场的数值分析

open access: yesGaoya dianqi, 2000
静电场的数值分析对于设计高性能的标准电容器是非常重要的。这里以250kV充气标准电容器的设计为例,详细介绍了静电场的计算方法和取得的结果。
李洪杰, 冯允平
doaj  

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