Hair Morphology Examination of Badger Meles Meles (L., 1758) in Turkey By Using Light And Scanning Electron Microscopes

A new generation of high performance field emission scanning electron microscopes (FSEM) is now commercially available (JEOL 890, Hitachi S 900, ISI OS 130-F) characterized by an "in lens" position of the specimen where probe diameters are reduced and signal collection improved. Additionally, low voltage operation is extended to 1 kV. Compared to the first generation of FSEM (JE0L JSM 30, Hitachi S 800), which utilized a specimen position below the final lens, specimen size had to be reduced but useful magnification could be impressively increased in both low (1-4 kV) and high (5-40 kV) voltage operation, i.e. from 50,000 to 200,000 and 250,000 to 1,000,000 x respectively.At high accelerating voltage and magnification, contrasts on biological specimens are well characterized1 and are produced by the entering probe electrons in the outmost surface layer within -vl nm depth. Backscattered electrons produce only a background signal. Under these conditions (FIG. 1) image quality is similar to conventional TEM (FIG. 2) and only limited at magnifications >1,000,000 x by probe size (0.5 nm) or non-localization effects (%0.5 nm).

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Observation of GaAs/AlAs Superlattice Structures in both Secondary and Backscattcred Electron Imaging Modes with an Ultrahigh Resolution Scanning Electron Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010018077x ◽

1990 ◽

Vol 48 (1) ◽

pp. 404-405

Author(s):

K. Ogura ◽

A. Ono ◽

S. Franchi ◽

P.G. Merli ◽

A. Migliori

Keyword(s):

Gaas Layer ◽

Objective Lens ◽

Superlattice Structure ◽

Backscattered Electron ◽

Instrumental Resolution ◽

Electron Microscopes ◽

Superlattice Structures ◽

Electron Imaging ◽

Scanning Electron Microscopes ◽

Scanning Electron

In the last few years the development of Scanning Electron Microscopes (SEM), equipped with a Field Emission Gun (FEG) and using in-lens specimen position, has allowed a significant improvement of the instrumental resolution . This is a result of the fine and bright probe provided by the FEG and by the reduced aberration coefficients of the strongly excited objective lens. The smaller specimen size required by in-lens instruments (about 1 cm, in comparison to 15 or 20 cm of a conventional SEM) doesn’t represent a serious limitation in the evaluation of semiconductor process techniques, where the demand of high resolution is continuosly increasing. In this field one of the more interesting applications, already described (1), is the observation of superlattice structures.In this note we report a comparison between secondary electron (SE) and backscattered electron (BSE) images of a GaAs / AlAs superlattice structure, whose cross section is reported in fig. 1. The structure consist of a 3 nm GaAs layer and 10 pairs of 7 nm GaAs / 15 nm AlAs layers grown on GaAs substrate. Fig. 2, 3 and 4 are SE images of this structure made with a JEOL JSM 890 SEM operating at an accelerating voltage of 3, 15 and 25 kV respectively. Fig. 5 is a 25 kV BSE image of the same specimen. It can be noticed that the 3nm layer is always visible and that the 3 kV SE image, in spite of the poorer resolution, shows the same contrast of the BSE image. In the SE mode, an increase of the accelerating voltage produces a contrast inversion. On the contrary, when observed with BSE, the layers of GaAs are always brighter than the AlAs ones , independently of the beam energy.

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Discoasters of the Blue Clay (Middle Miocene) of Malta and Gozo

Geological Magazine ◽

10.1017/s0016756800040942 ◽

1978 ◽

Vol 115 (1) ◽

pp. 1-19 ◽

Cited By ~ 3

Author(s):

Minoo Hojjatzadeh

Keyword(s):

Middle Miocene ◽

The Family ◽

Electron Microscopes ◽

Scanning Electron Microscopes ◽

Scanning Electron

SummaryTwenty-three species of the Family Discoasteraceae Vekshina, 1959 recovered from 18 samples of the Blue Clay at Fort Chambray, Gozo, and 31 samples from Fomm-Ir-Rih Bay, Malta, have been studied under light and scanning electron microscopes. Fourteen Middle Miocene species are reviewed, their stratigraphical ranges and importance as marker species discussed. Nine species are described as new. On the basis of the discoaster species present, a Middle Miocene age (NN.6 Discoaster exilis Zone – NN.7 Discoaster kugleri Zone) for the Blue Clay in Malta and Gozo is suggested.

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Response function and optimum configuration of semiconductor backscattered-electron detectors for scanning electron microscopes

Semiconductors ◽

10.1134/s1063782612060139 ◽

2012 ◽

Vol 46 (6) ◽

pp. 810-813 ◽

Cited By ~ 1

Author(s):

E. I. Rau ◽

N. A. Orlikovskiy ◽

E. S. Ivanova

Keyword(s):

Response Function ◽

Optimum Configuration ◽

Backscattered Electron ◽

Electron Microscopes ◽

Scanning Electron Microscopes ◽

Scanning Electron

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Atomic force microscopy as a novel pharmacological tool11Abbreviations: AFM, atomic force microscope; SEMs, scanning electron microscopes; and SNP, single nucleotide polymorphism.

Biochemical Pharmacology ◽

10.1016/s0006-2952(01)00746-8 ◽

2001 ◽

Vol 62 (8) ◽

pp. 975-983 ◽

Cited By ~ 41

Author(s):

Ricardo de Souza Pereira

Keyword(s):

Atomic Force Microscopy ◽

Single Nucleotide Polymorphism ◽

Atomic Force Microscope ◽

Nucleotide Polymorphism ◽

Single Nucleotide ◽

Force Microscopy ◽

Atomic Force ◽

Electron Microscopes ◽

Scanning Electron Microscopes ◽

Scanning Electron

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Ultrastructure of cleistothecia and the stages of life cycle of Microsphaera palczewskii by scanning electron microscope

Acta Mycologica ◽

10.5586/am.1997.023 ◽

2014 ◽

Vol 32 (2) ◽

pp. 275-278

Author(s):

Joanna Z. Kadłubowska ◽

Ewa Kalinowska-Kucharska

Keyword(s):

Electron Microscope ◽

Life Cycle ◽

Scanning Electron Microscope ◽

Scanning Microscopy ◽

Developmental Cycle ◽

Central Poland ◽

Caragana Arborescens ◽

Electron Microscopes ◽

Scanning Electron Microscopes ◽

Scanning Electron

Several year long investigations of the developmental cycle of <i>Microsphaera palczewskii</i> occurring on the leaves of <i>Caragana arborescens</i> in Central Poland are reported. The material was studied with light and scanning electron microscopes. The scanning microscopy micrographs of the clistothecia and appendages presented in this report are the first micrographs of this species.

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Scanning electron microscope fine tuning using four-bar piezoelectric actuated mechanism

Journal of Electrical Engineering ◽

10.1515/jee-2018-0003 ◽

2018 ◽

Vol 69 (1) ◽

pp. 24-31

Author(s):

Khaled S. Hatamleh ◽

Qais A. Khasawneh ◽

Adnan Al-Ghasem ◽

Mohammad A. Jaradat ◽

Laith Sawaqed ◽

...

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Inverse Kinematic ◽

Fine Tuning ◽

Electron Microscopes ◽

Tuning Strategy ◽

Scanning Electron Microscopes ◽

Fine Tune ◽

Kinematic Solution ◽

Scanning Electron

Abstract Scanning Electron Microscopes are extensively used for accurate micro/nano images exploring. Several strategies have been proposed to fine tune those microscopes in the past few years. This work presents a new fine tuning strategy of a scanning electron microscope sample table using four bar piezoelectric actuated mechanisms. The introduced paper presents an algorithm to find all possible inverse kinematics solutions of the proposed mechanism. In addition, another algorithm is presented to search for the optimal inverse kinematic solution. Both algorithms are used simultaneously by means of a simulation study to fine tune a scanning electron microscope sample table through a pre-specified circular or linear path of motion. Results of the study shows that, proposed algorithms were able to minimize the power required to drive the piezoelectric actuated mechanism by a ratio of 97.5% for all simulated paths of motion when compared to general non-optimized solution.

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